Access control method and related device

Abstract

The present application provides an access control method and related apparatus, wherein the method comprises: a first terminal device UE1 sends access control information of a serving cell of UE1 to a second terminal device UE2; wherein the access control information of the serving cell is used by UE2 to determine whether to allow UE2 to access the serving cell according to the access control information of the serving cell and the access parameters of UE2. The present application provides an access control method when accessing a cell through a relay terminal.

Description

[0001] This application is a divisional application. The application number of the original application is 202010617622.4, and the original application date is June 30, 2020. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to an access control method and related devices. Background Art

[0003] In wireless communication technology, UE-to-Network relay technology is considered to be a communication technology that can effectively improve cell coverage.

[0004] Figure 1 is a schematic diagram of a network architecture of a wireless communication system. As shown in Figure 1, there are several terminals (User Equipment, UE) in the signal coverage range of a cell on the wireless network side (radio access network, RAN) and outside the signal coverage range. The UE far from the center of the cell can be called a remote terminal (remoteUE), and the UE within the coverage range of the cell can be used as a relay terminal (relay UE) to forward the interaction information between the remote UE and the RAN, so that the remote UE can access the RAN.

[0005] When a remote UE needs to access the RAN through a relay UE, the remote UE sends a (radioresource control, RRC) connection establishment request to the relay UE, and then the relay UE forwards the message to the RAN. The RRC connection establishment request is used to establish an RRC connection between the remote UE and the RAN. Since all remote UEs can access the RAN through the relay UE, the load of the remote UE accessing the cell is too heavy. At present, there is an urgent need for an access control method for remote UEs. Summary of the invention

[0006] The present application provides an access control method and related devices based on relay terminal access to a cell.

[0007] In a first aspect, the present application provides an access control method, which is applied to a UE1 side, and the method includes:

[0008] The first terminal device UE1 sends access control information of a serving cell of the UE1 to the second terminal device UE2;

[0009] The access control information of the serving cell is used by the UE2 to determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameters of the UE2.

[0010] In an embodiment of the present application, when UE2 determines that UE2 is allowed to access the cell, it can execute an allow processing flow, for example, sending a unicast connection establishment request to UE1, and another example, sending a first RRC connection establishment request to UE1; when UE2 determines that UE2 is prohibited from accessing the cell, it can execute a prohibition processing flow, for example, UE2 executes the step of reselecting the relay terminal, and another example, UE2 sends a unicast connection release to UE1. When UE1 determines that UE2 is allowed to access the cell, it can execute a UE1-related allow processing flow, for example, when receiving a unicast connection establishment request, it sends a unicast connection establishment response to UE2, and another example, when receiving the first RRC connection establishment request, it forwards the first RRC connection establishment request to RAN. That is, UE2 is allowed to send an RRC connection establishment request to RAN through UE1 and UE1 agrees to forward the interaction message between UE2 and RAN for establishing an RRC connection.

[0011] By adopting the technical solution provided in the embodiment of the present application, access control can be implemented at each stage when UE2 accesses a cell through UE1.

[0012] In an optional implementation manner of the first aspect, before the UE1 sends the access control information of the serving cell of the UE1 to the UE2, the method further includes: receiving PLMN information of the UE2 sent by the UE2;

[0013] The UE1 sends access control information of the serving cell of the UE1 to the UE2, including:

[0014] Send access control information of the serving cell corresponding to the PLMN information of the UE2 to the UE2.

[0015] In the embodiment of the present application, the access control information corresponding to the PLMN information of UE2 is the access control information applicable to the PLMN ID.

[0016] In an optional implementation of the first aspect, the UE1 sending the access control information of the serving cell of the UE1 to the UE2 includes:

[0017] The UE1 sends a first discovery message carrying access control information of the serving cell to the UE2.

[0018] In the embodiment of the present application, the first discovery message is a discovery request in the Model A discovery process.

[0019] In an optional implementation manner of the first aspect, the receiving the PLMN information of the UE2 sent by the UE2 includes:

[0020] Receive a second discovery request sent by the UE2 and carrying the PLMN information of the UE2.

[0021] In the embodiment of the present application, the second discovery request is a discovery request in the Model B discovery process.

[0022] In an optional implementation of the first aspect, the UE1 sending the access control information of the serving cell of the UE1 to the UE2 includes:

[0023] Send a second discovery response carrying the access control information of the serving cell to the UE2.

[0024] In the embodiment of the present application, the second discovery response is a discovery response in the Model B discovery process.

[0025] In an optional implementation manner of the first aspect, the receiving the PLMN information of the UE2 sent by the UE2 includes:

[0026] A unicast connection establishment request carrying the PLMN information of the UE2 and sent by the UE2 is received; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0027] In an optional implementation of the first aspect, the UE1 sending the access control information of the serving cell of the UE1 to the UE2 includes:

[0028] A unicast connection establishment response carrying the access control information of the serving cell is sent to the UE2; wherein the unicast connection establishment response is used to indicate that the sidelink unicast connection between the UE1 and the UE2 is established successfully.

[0029] In an optional implementation of the first aspect, the receiving the PLMN information of the UE2 sent by the UE2 includes: receiving a second sidelink RRC message sent by the UE2 and carrying the PLMN information of the UE2.

[0030] In an optional implementation of the first aspect, the UE1 sending the access control information of the serving cell of the UE1 to the UE2 includes:

[0031] A first sidelink RRC message carrying access control information of the serving cell is sent to the UE2.

[0032] In an optional implementation manner of the first aspect, after the UE1 sends the access control information of the serving cell of the UE1 to the UE2, the method further includes:

[0033] Receiving a unicast connection establishment request sent by the UE2;

[0034] Sending a unicast connection establishment response to the UE2;

[0035] The unicast connection establishment request is sent by the UE2 when it is determined that the UE2 is allowed to access the serving cell; the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0036] In an optional implementation of the first aspect, the method further includes:

[0037] receiving a first RRC connection establishment request sent by the UE2; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs;

[0038] Sending the first RRC connection establishment request to the RAN.

[0039] In an optional implementation manner of the first aspect, after the UE1 sends the access control information of the serving cell of the UE1 to the UE2, the method further includes:

[0040] receiving a first RRC connection establishment request sent by the UE2; wherein the first RRC connection establishment request is sent by the UE2 when it is determined that the UE2 is allowed to access the serving cell; and the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the cell belongs;

[0041] Sending the first RRC connection establishment request to the RAN.

[0042] In an optional implementation of the first aspect, before sending the first RRC connection establishment request to the RAN, the method further includes:

[0043] When the UE1 is in a non-connected state, a second RRC connection establishment request is sent to the RAN; wherein the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[0044] In an embodiment of the present application, when in the Idle state, the second RRC connection establishment request is RRCSetupRequest, and when in the Inactive state, the second RRC connection establishment request is RRCResumeRequest.

[0045] In an optional implementation of the first aspect, the connection establishment cause value in the second RRC connection establishment request is: relay, or the connection establishment cause value in the first RRC connection establishment request.

[0046] In an optional implementation manner of the first aspect, after the UE1 sends the access control information of the serving cell of the UE1 to the UE2, the method further includes:

[0047] Receive the unicast connection release sent by the UE2; wherein the unicast connection release is sent by the UE2 when it is determined that the UE2 is prohibited from accessing the serving cell; the unicast connection release is used to request the release of the side link unicast connection between the UE1 and the UE2.

[0048] In the embodiment of the present application, thereafter, the UE1 may locally release the sidelink unicast connection.

[0049] In an optional implementation of the first aspect, the connection release reason value in the unicast connection release is prohibited access to the cell.

[0050] In an optional implementation manner of the first aspect, after the UE1 sends the access control information of the serving cell of the UE1 to the UE2, the method further includes:

[0051] Receiving a unicast connection establishment request sent by the UE2;

[0052] When the UE1 is in a non-connected state, a second RRC connection establishment request is sent to the RAN; wherein the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[0053] In an optional implementation manner of the first aspect, after the sending the second RRC connection establishment request to the RAN, the method further includes:

[0054] receiving a second RRC connection rejection sent by the RAN;

[0055] A unicast connection rejection is sent to the UE2.

[0056] In an optional implementation of the first aspect, after the UE1 sends the access control information of the serving cell of the UE1 to the UE2, the method further includes:

[0057] receiving a first RRC connection establishment request sent by the UE2; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs;

[0058] When the UE1 is in a non-connected state, a second RRC connection establishment request is sent to the RAN; wherein the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[0059] In an optional implementation manner of the first aspect, after the sending the second RRC connection establishment request to the RAN, the method further includes:

[0060] receiving a second RRC connection rejection sent by the RAN;

[0061] Send a unicast connection release to the UE2.

[0062] In an optional implementation of the first aspect, a connection rejection reason value in the unicast connection rejection is relay not supported.

[0063] In an optional implementation of the first aspect, a connection release reason value in the unicast connection release is relay not supported.

[0064] In an optional implementation of the first aspect, the connection rejection reason value in the second RRC connection rejection is that relay is not supported.

[0065] In an optional implementation of the first aspect, the access parameters of the UE2 include: an access type AC and an access indication AI.

[0066] In an optional implementation manner of the first aspect, before the UE1 sends the access control information of the serving cell of the UE1 to the UE2, the method includes:

[0067] Access control information of at least one cell sent by the RAN is received, where the at least one cell includes a serving cell of the UE1.

[0068] In a second aspect, an embodiment of the present application provides an access control method, which is applied to a UE2 side, including:

[0069] The second terminal UE2 receives the access control information of the serving cell of the UE1 sent by the first terminal UE1;

[0070] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0071] In the embodiment of the present application, the method further includes: when it is determined that the UE2 is allowed to access the serving cell, executing an allow processing procedure; or, when it is determined that the UE2 is prohibited from accessing the serving cell, executing a prohibition processing procedure.

[0072] In an optional implementation manner of the second aspect, before the UE2 receives the access control information of the serving cell of the UE1 sent by the UE1, the method further includes: sending the PLMN information of the UE2 to the UE1;

[0073] The UE2 receives the access control information of the serving cell of the UE1 sent by the UE1, including:

[0074] Receive the access control information of the serving cell corresponding to the PLMN information of the UE2 sent by the UE1.

[0075] In an optional implementation of the second aspect, the UE2 receiving the access control information of the serving cell of the UE1 sent by the UE1 includes: receiving a first discovery message sent by the UE1 and carrying the access control information of the serving cell of the UE1;

[0076] The method further comprises:

[0077] When it is determined that the UE2 is allowed to access the serving cell, a unicast connection establishment request is sent to the UE1; or,

[0078] When it is determined that the UE2 is prohibited from accessing the serving cell, a step of reselecting a relay terminal is performed.

[0079] In an optional implementation manner of the second aspect, the sending the PLMN information of the UE2 to the UE1 includes:

[0080] A second discovery request carrying the PLMN information of the UE2 is sent to the UE1.

[0081] In an optional implementation of the second aspect, the UE2 receiving the access control information of the serving cell of the UE1 sent by the UE1 includes: receiving a second discovery response sent by the UE1 and carrying the access control information of the serving cell of the UE1;

[0082] The method further comprises:

[0083] When it is determined that the UE2 is allowed to access the serving cell, a unicast connection establishment request is sent to the UE1, wherein the unicast connection establishment request is used to request to establish a sidelink unicast connection between the UE1 and the UE2; or

[0084] When it is determined that the UE2 is prohibited from accessing the serving cell, a step of reselecting a relay terminal is performed.

[0085] In an optional implementation manner of the second aspect, the sending the PLMN information of the UE2 to the UE1 includes:

[0086] A unicast connection establishment request carrying the PLMN information of the UE2 is sent to the UE1; wherein the unicast connection establishment request is used to request to establish a sidelink unicast connection between the UE1 and the UE2.

[0087] In an optional implementation of the second aspect, the UE2 receiving the access control information of the serving cell of the UE1 sent by the UE1 includes: receiving a unicast connection establishment response sent by the UE1 and carrying the access control information of the serving cell of the UE1, wherein the unicast connection establishment response is used to indicate that the sidelink unicast connection between the UE1 and the UE2 is established;

[0088] The method further comprises:

[0089] When it is determined that the UE2 is allowed to access the serving cell, a first RRC connection establishment request is sent to the UE1, wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN; or

[0090] When it is determined that the UE2 is prohibited from accessing the serving cell, a unicast connection release is sent to the UE1, wherein the unicast connection release is used to request the release of the sidelink unicast connection between the UE1 and the UE2.

[0091] In an optional implementation manner of the second aspect, the sending the PLMN information of the UE2 to the UE1 includes:

[0092] A second sidelink RRC message carrying the PLMN information of the UE2 is sent to the UE1.

[0093] In an optional implementation of the second aspect, the UE2 receiving the access control information of the serving cell of the UE1 sent by the UE1 includes: receiving a first sidelink RRC message sent by the UE1 and carrying the access control information of the serving cell of the UE1;

[0094] The method further comprises:

[0095] When it is determined that the UE2 is allowed to access the serving cell, a first RRC connection establishment request is sent to the UE1, wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN; or

[0096] When it is determined that the UE2 is prohibited from accessing the serving cell, a unicast connection release is sent to the UE1, wherein the unicast connection release is used to request the release of the sidelink unicast connection between the UE1 and the UE2.

[0097] In an optional implementation of the second aspect, after the UE2 sends the unicast connection establishment request to the UE1, the method further includes:

[0098] Receiving a unicast connection establishment response sent by the UE1;

[0099] A first RRC connection establishment request is sent to the UE1, where the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[0100] In an optional implementation of the second aspect, after sending the first RRC connection establishment request to the UE1, the method further includes:

[0101] Receiving a first RRC connection establishment sent by the UE1;

[0102] Send a first RRC connection establishment completion message to the UE1.

[0103] In an optional implementation of the second aspect, after sending the first RRC connection establishment request to the UE1, the method further includes:

[0104] receiving a first RRC connection rejection sent by the UE1, wherein the first RRC connection rejection is sent when the UE1 is prohibited from serving as a relay terminal;

[0105] Sending a unicast connection release to the UE1, wherein the unicast connection release is used to release the side link unicast connection between the UE1 and the UE2;

[0106] Perform the steps to reselect the relay terminal.

[0107] In an optional implementation of the second aspect, the method further includes:

[0108] receiving a unicast connection release sent by the UE1, wherein the unicast connection release is sent when the UE1 is prohibited from being a relay terminal, and the unicast connection release is used to release the side link unicast connection between the UE1 and the UE2;

[0109] Perform the steps to reselect the relay terminal.

[0110] In an optional implementation of the second aspect, the connection release reason value in the unicast connection release is prohibited access to the cell.

[0111] In an optional implementation of the second aspect, the access parameters of the UE2 include: an access type AC and an access indication AI.

[0112] In a third aspect, an embodiment of the present application provides an access control method, which is applied to a UE2 side, including:

[0113] The second terminal device UE2 sends the access parameters of the UE2 to the first terminal device UE1;

[0114] The access parameter of UE2 is used by UE1 to determine whether to allow UE2 to access the serving cell according to the access control information of the serving cell of UE1 and the access parameter of UE2.

[0115] In an optional implementation of the third aspect, the access parameters of the UE2 include the access type AC and access indication AI of the UE2.

[0116] In an optional implementation manner of the third aspect, the access parameter of the UE2 includes PLMN information of the UE2;

[0117] The PLMN information of UE2 is used by UE1 to determine whether to allow UE2 to access the serving cell according to the access parameter of UE2 and the access control information of the serving cell corresponding to the PLMN information of UE2.

[0118] In an optional implementation manner of the third aspect, the UE2 sending the access parameter of the UE2 to the UE1 includes:

[0119] A second discovery request carrying the access parameters of the UE2 is sent to the UE1.

[0120] In an optional implementation manner of the third aspect, the UE2 sending the access parameter of the UE2 to the UE1 includes:

[0121] Sending a unicast connection establishment request carrying access parameters of the UE2 to the UE1;

[0122] The unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0123] In an optional implementation manner of the third aspect, the UE2 sending the access parameter of the UE2 to the UE1 includes:

[0124] A third sidelink RRC message carrying the access parameters of the UE2 is sent to the UE1.

[0125] In an optional implementation manner of the third aspect, the UE2 sending the access parameter of the UE2 to the UE1 includes:

[0126] Sending a first RRC connection establishment request and access parameters of the UE2 to the UE1; or,

[0127] Sending a first RRC connection establishment request carrying access parameters of the UE2 to the UE1;

[0128] The first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[0129] In an optional implementation manner of the third aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0130] receiving a second discovery response sent by the UE1, where the second discovery response is sent by the UE1 when determining to allow the UE2 to access the serving cell;

[0131] A unicast connection establishment request is sent to the UE1, wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0132] In an optional implementation manner of the third aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0133] A second discovery reject is received, where the second discovery reject is sent by the UE1 when the UE1 determines to prohibit the UE2 from accessing the serving cell.

[0134] In an optional implementation manner of the third aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0135] A second discovery response sent by the UE1 is received, where the second discovery response includes a determination result of whether the UE2 is allowed to access the serving cell.

[0136] In an optional implementation of the third aspect, the method further includes:

[0137] When the determination result is that the UE2 is allowed to access the serving cell, a unicast connection establishment request is sent to the UE1; wherein the unicast connection establishment request is used to request to establish a sidelink unicast connection between the UE1 and the UE2;

[0138] or,

[0139] When the determination result is that the UE2 is prohibited from accessing the serving cell, a step of reselecting a relay terminal is performed.

[0140] In an optional implementation manner of the third aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0141] receiving a unicast connection establishment response sent by the UE1, where the unicast connection establishment response is sent by the UE1 when determining to allow the UE2 to access the serving cell;

[0142] A first RRC connection establishment request is sent to the UE1; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[0143] In an optional implementation manner of the third aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0144] A unicast connection rejection is received from the UE1, where the unicast connection rejection is sent when the UE1 determines to prohibit the UE2 from accessing the serving cell.

[0145] In an optional implementation manner of the third aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0146] A unicast connection establishment request response sent by the UE1 is received, where the unicast connection establishment response includes a determination result of whether the UE2 is allowed to access the serving cell.

[0147] In an optional implementation manner of the third aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0148] A fourth sidelink RRC message sent by the UE1 is received, where the fourth sidelink RRC message includes a determination result of whether the UE2 is allowed to access the serving cell.

[0149] In an optional implementation of the third aspect, the method further includes:

[0150] When it is determined that the UE2 is allowed to access the serving cell, a first RRC connection establishment request is sent to the UE1; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs; or,

[0151] When it is determined that the UE2 is prohibited from accessing the serving cell, a unicast connection release is sent to the UE1; wherein the unicast connection release is used to release the sidelink unicast connection between the UE1 and the UE2.

[0152] In an optional implementation manner of the third aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0153] receiving a first RRC connection establishment sent by the UE1, where the first RRC connection establishment is sent by the UE1 when determining to allow the UE2 to access the serving cell;

[0154] Send a first RRC connection establishment completion message to the UE1.

[0155] In an optional implementation manner of the third aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0156] receiving a first RRC connection rejection sent by the UE1, where the first RRC connection rejection is sent by the UE1 when determining to prohibit the UE2 from accessing the serving cell; or,

[0157] A prohibition indication sent by the UE1 is received, where the prohibition indication is used to indicate that the UE2 is prohibited from accessing the serving cell.

[0158] In an optional implementation of the third aspect, the rejection reason value in the second discovery rejection is prohibited from accessing the cell.

[0159] In an optional implementation of the third aspect, the connection rejection reason value in the unicast connection rejection is prohibited access to the cell.

[0160] In an optional implementation of the third aspect, a connection release reason value for the unicast connection release is a prohibited access to the cell.

[0161] In an optional implementation of the third aspect, the connection rejection reason value in the first RRC connection rejection is prohibited access to the cell.

[0162] In an optional implementation manner of the third aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0163] A unicast connection rejection sent by the UE1 is received, wherein a connection rejection reason value in the unicast connection rejection is "relay is not supported".

[0164] In an optional implementation manner of the third aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0165] A unicast connection release is received from the UE1, wherein a rejection reason value in the unicast connection release is "relay is not supported".

[0166] In an optional implementation of the third aspect, the method further includes: executing a step of reselecting a relay terminal.

[0167] In a fourth aspect, the present application provides an access control method, which is applied to a UE1 side, and the method includes:

[0168] The first terminal device UE1 receives the access parameter of the UE2 sent by the second terminal device UE2;

[0169] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell of the UE1 and the access parameter of the UE2.

[0170] In an optional implementation manner of the fourth aspect, the access parameter of the UE2 includes PLMN information of the UE2;

[0171] The determining whether to allow the UE2 to access the service cell based on the access control information of the service cell of the UE1 and the access parameters of the UE2 includes: determining whether to allow the UE2 to access the service cell based on the access control information of the service cell corresponding to the PLMN information of the UE2 and the access parameters of the UE2.

[0172] In an optional implementation manner of the fourth aspect, after the UE1 receives the access parameter of the UE2 sent by the UE2, the method further includes: sending a determination result to the UE2;

[0173] The determination result is used to indicate whether the UE2 is allowed or prohibited from accessing the serving cell.

[0174] In the embodiment of the present application, when determining to allow the UE2 to access the serving cell, the UE1 sends the determination result to the UE2, including: sending a permission indication to the UE2; or,

[0175] When determining to prohibit the UE2 from accessing the serving cell, the UE1 sends a determination result to the UE2, including: sending a prohibition indication to the UE2.

[0176] In an optional implementation manner of the fourth aspect, the receiving, by the UE1, the access parameter of the UE2 sent by the UE2 includes:

[0177] receiving a second discovery request sent by the UE2 and carrying the access parameters of the UE2; or,

[0178] receiving a unicast connection establishment request sent by the UE2 and carrying access parameters of the UE2; or,

[0179] receiving a first sidelink RRC message sent by the UE2 and carrying access parameters of the UE2; or,

[0180] Receive a first RRC connection establishment request sent by the UE2 and carrying the access parameters of the UE2.

[0181] In an optional implementation manner of the fourth aspect, the UE1 receiving the access parameter of the UE2 sent by the UE2 includes: receiving a second discovery request sent by the UE2 and carrying the access parameter of the UE2;

[0182] After the UE1 determines whether to allow the UE2 to access the serving cell according to the access control information of the serving cell of the UE1 and the access parameter of the UE2, the method includes:

[0183] When it is determined that the UE2 is allowed to access the serving cell, a second discovery response is sent to the UE2; or when it is determined that the UE2 is prohibited from accessing the serving cell, a second discovery rejection is sent to the UE2.

[0184] In this embodiment of the present application, the second discovery response may be used to instruct the UE2 to send a unicast connection establishment request to the UE1.

[0185] In an optional implementation manner of the fourth aspect, the receiving, by the UE1, the access parameter of the UE2 sent by the UE2 includes:

[0186] receiving a unicast connection establishment request sent by the UE2 and carrying the access parameters of the UE2; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2;

[0187] After the UE1 determines whether to allow the UE2 to access the serving cell according to the access control information of the serving cell of the UE1 and the access parameter of the UE2, the method includes:

[0188] When it is determined that the UE2 is allowed to access the serving cell, a unicast connection establishment response is sent to the UE2; or when it is determined that the UE2 is prohibited from accessing the serving cell, a unicast connection rejection is sent to the UE2.

[0189] In this embodiment of the present application, the unicast connection establishment response may be used to instruct the UE2 to send a first RRC connection establishment request to the UE1.

[0190] In an optional implementation manner of the fourth aspect, the UE1 receiving the access parameters of the UE2 sent by the UE2 includes: receiving a third sidelink RRC message sent by the UE2 and carrying the access parameters of the UE2;

[0191] The sending the determination result to the UE2 includes:

[0192] Send a fourth sidelink RRC message carrying the determination result to the UE2; wherein the determination result is allowing or prohibiting the UE2 from accessing the serving cell.

[0193] In an optional implementation manner of the fourth aspect, the UE1 receiving the access parameter of the UE2 sent by the UE2 includes: receiving a first RRC connection establishment request sent by the UE2 and carrying the access parameter of the UE2; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs;

[0194] After the UE1 determines whether to allow the UE2 to access the serving cell according to the access control information of the serving cell of the UE1 and the access parameter of the UE2, the method includes:

[0195] When it is determined that the UE2 is allowed to access the serving cell, the first RRC connection establishment request is sent to the RAN to which the serving cell belongs; or when it is determined that the UE2 is prohibited from accessing the serving cell, a first RRC connection rejection or a unicast connection release is sent to the UE2; the unicast connection release is used to release the side link unicast connection between the UE1 and the UE2.

[0196] In an optional implementation of the fourth aspect, the connection rejection reason value in the unicast connection rejection is prohibited access to the cell.

[0197] In an optional implementation of the fourth aspect, the connection rejection reason value in the first RRC connection rejection is prohibited access to the cell.

[0198] In an optional implementation manner of the fourth aspect, when determining to allow the UE2 to access the serving cell, sending the first RRC connection establishment request to the RAN to which the serving cell belongs includes:

[0199] When it is determined that the UE2 is allowed to access the serving cell and the UE1 is in a non-connected state, sending a second RRC connection establishment request to the RAN; wherein the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN;

[0200] Receiving a second RRC connection establishment sent by the RAN;

[0201] Sending the first RRC connection establishment request to the RAN.

[0202] In an optional implementation of the fourth aspect, the connection establishment cause value in the second RRC connection establishment request is relay, or the connection establishment cause value in the first RRC connection establishment request.

[0203] In a fifth aspect, an embodiment of the present application provides an access control method, which is applied to a UE1 side, including:

[0204] The first terminal device UE1 receives the access parameter of the UE2 sent by the second terminal device UE2;

[0205] Sending to UE2 a determination result of whether to allow UE2 to access the serving cell of UE1;

[0206] The determination result is obtained according to the access parameter of the UE2 and the access control information of the serving cell.

[0207] In an optional implementation manner of the fifth aspect, the access parameter of the UE2 includes PLMN information of the UE2;

[0208] The determination result is obtained according to the access control information of the serving cell corresponding to the PLMN information of the UE2 and the access parameters of the UE2.

[0209] In an optional implementation manner of the fifth aspect, the receiving, by the UE1, the access parameter of the UE2 sent by the UE2 includes:

[0210] receiving a second discovery request sent by the UE2 and carrying the access parameters of the UE2;

[0211] In an optional implementation manner of the fifth aspect, the receiving, by the UE1, the access parameter of the UE2 sent by the UE2 includes:

[0212] Receive a unicast connection establishment request sent by the UE2 and carrying the access parameters of the UE2.

[0213] In an optional implementation manner of the fifth aspect, the receiving, by the UE1, the access parameter of the UE2 sent by the UE2 includes:

[0214] Receive a third side link RRC message sent by the UE2 and carrying the access parameters of the UE2.

[0215] In an optional implementation manner of the fifth aspect, the sending to UE2 a determination result of whether to allow UE2 to access the serving cell includes:

[0216] Send a second discovery response carrying the determination result to the UE2.

[0217] In an optional implementation manner of the fifth aspect, the sending to UE2 a determination result of whether to allow UE2 to access the serving cell includes:

[0218] Send a unicast connection establishment response carrying the determination result to the UE2.

[0219] In an optional implementation manner of the fifth aspect, the sending to UE2 a determination result of whether to allow UE2 to access the serving cell includes:

[0220] Send a fourth sidelink RRC message carrying the determination result to the UE2.

[0221] In an optional implementation manner of the fifth aspect, the sending to UE2 a determination result of whether to allow UE2 to access the serving cell of UE1 includes:

[0222] When the determination result is allowed, sending a second discovery response to the UE2; wherein the second discovery response is used to indicate that the determination result is allowed; or,

[0223] When the determination result is prohibited, a second discovery reject is sent to the UE2; wherein the second discovery reject is used to indicate that the determination result is prohibited.

[0224] In an optional implementation manner of the fifth aspect, the UE1 sending, to the UE2, a determination result of whether to allow the UE2 to access a cell includes:

[0225] When the determination result is allowed, sending a unicast connection establishment response to the UE2; wherein the unicast connection establishment response is used to indicate that the determination result is allowed; or,

[0226] When the determination result is prohibited, a unicast connection rejection is sent to the UE2; wherein the unicast connection rejection is used to indicate that the determination result is prohibited.

[0227] In an optional implementation manner of the fifth aspect, the receiving, by the UE1, the access parameter of the UE2 sent by the UE2 includes:

[0228] The first RRC connection establishment request carrying the access parameters of the UE2 and sent by the UE2 is received; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell of the UE1 belongs.

[0229] In an optional implementation manner of the fifth aspect, the UE1 sending, to the UE2, a determination result of whether to allow the UE2 to access a cell includes:

[0230] Send a first RRC connection establishment message carrying the determination result to the UE2.

[0231] In the embodiment of the present application, when the first RRC connection establishment carries the determination result, UE1 has actually forwarded the first RRC connection establishment request to the RAN. Therefore, when UE1 receives the first RRC connection establishment request carrying the access parameters of UE2, if it is determined to be prohibited, UE1 can directly send a first RRC connection rejection to UE2.

[0232] In a sixth aspect, an embodiment of the present application provides an access control method, which is applied to a UE2 side, including:

[0233] The second terminal device UE2 receives the discovery process message sent by the first terminal device UE1;

[0234] When it is determined that the UE2 is allowed to access the serving cell of the UE1, sending a unicast connection establishment request to the UE1;

[0235] The unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0236] In the embodiment of the present application, the discovery process message may be used to determine whether the UE2 is allowed to access the serving cell of the UE1.

[0237] In an embodiment of the present application, the first terminal device UE1 sends access control information of the service cell of the UE1 to the second terminal device UE2; the access control information of the service cell can be used by the UE2 to determine whether the UE2 is allowed to access the service cell of the UE1.

[0238] In an optional implementation manner of the sixth aspect, the discovery process message includes: access control information of the serving cell; and the method further includes:

[0239] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0240] In an optional implementation manner of the sixth aspect, before the UE2 receives the discovery process message sent by the UE1, the method includes: sending an access parameter of the UE2 to the UE1; wherein the access parameter of the UE2 is used to indicate that the UE1 determines whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2;

[0241] The discovery process message includes: a determination result of whether the UE2 is allowed to access the serving cell.

[0242] In an optional implementation manner of the sixth aspect, the access parameter of the UE2 includes: PLMN information of the UE2;

[0243] The access parameter of UE2 is used to instruct UE1 to determine whether to allow UE2 to access the serving cell according to the access control information corresponding to the PLMN information and the access parameter of UE2.

[0244] In an optional implementation manner of the sixth aspect, determining whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2 includes:

[0245] Acquire access control information of the serving cell corresponding to the PLMN information of the UE2;

[0246] Determine whether to allow the UE2 to access the serving cell according to the acquired access control information and the access parameters of the UE2.

[0247] In an optional implementation manner of the sixth aspect, before the UE2 receives the discovery process message sent by the UE1, the method includes: sending PLMN information of the UE2 to the UE1;

[0248] The access control information of the serving cell includes: the access control information of the serving cell corresponding to the PLMN information of the UE2.

[0249] In an optional implementation of the sixth aspect, the discovery process message is a first discovery message sent by the UE1 to the UE2.

[0250] In an optional implementation manner of the sixth aspect, the sending the PLMN information of the UE2 to the UE1 includes: sending a second discovery request carrying the PLMN information of the UE2 to the UE1;

[0251] The discovery process message is a second discovery response carrying access control information of the serving cell.

[0252] In an optional implementation manner of the sixth aspect, the sending the access parameter of the UE2 to the UE1 includes: sending a second discovery request carrying the access parameter of the UE2 to the UE1;

[0253] The discovery process message is a second discovery response carrying the determination result.

[0254] In an optional implementation of the sixth aspect, the method further includes:

[0255] Receiving a unicast connection establishment response sent by the UE1;

[0256] A first RRC connection establishment request is sent to the UE1, where the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[0257] In an optional implementation manner of the sixth aspect, before sending the unicast connection establishment request to UE1, the method further includes: acquiring a cause value for establishing an RRC connection between the UE2 and the RAN;

[0258] The unicast connection establishment request includes a cause value for establishing the RRC connection between the UE2 and the RAN.

[0259] In this embodiment of the present application, the connection establishment cause value of the second RRC connection establishment request sent by UE1 to the RAN may be relay, or the cause value for establishing the RRC connection between the UE2 and the RAN carried in the unicast connection establishment request, or the connection establishment cause value of the first RRC connection establishment request.

[0260] In an optional implementation of the sixth aspect, the method further includes:

[0261] When it is determined that the UE2 is prohibited from accessing the serving cell, a step of reselecting a relay terminal is performed.

[0262] In an optional implementation of the sixth aspect, the access parameters of the UE2 include: an access type AC and an access indication AI.

[0263] In a seventh aspect, an embodiment of the present application provides an access control method, which is applied to a UE2 side, including:

[0264] The second terminal device UE2 receives the discovery process message sent by the first terminal device UE1;

[0265] When it is determined that the UE2 is prohibited from accessing the serving cell of the UE1, a step of reselecting a relay terminal is performed.

[0266] In an optional implementation of the seventh aspect, the access parameters of the UE2 include the access type AC and access indication AI of the UE2.

[0267] In an optional implementation manner of the seventh aspect, the access parameter of the UE2 includes PLMN information of the UE2;

[0268] The PLMN information of UE2 is used to instruct UE1 to determine whether to allow UE2 to access the serving cell according to the access parameter of UE2 and the access control information of the serving cell corresponding to the PLMN information of UE2.

[0269] In an optional implementation manner of the seventh aspect, the UE2 sending the access parameter of the UE2 to the UE1 includes:

[0270] A second discovery request carrying the access parameters of the UE2 is sent to the UE1.

[0271] In an optional implementation manner of the seventh aspect, the UE2 sending the access parameter of the UE2 to the UE1 includes:

[0272] Sending a unicast connection establishment request carrying access parameters of the UE2 to the UE1;

[0273] The unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0274] In an optional implementation manner of the seventh aspect, the UE2 sending the access parameter of the UE2 to the UE1 includes:

[0275] A third sidelink RRC message carrying the access parameters of the UE2 is sent to the UE1.

[0276] In an optional implementation manner of the seventh aspect, the UE2 sending the access parameter of the UE2 to the UE1 includes:

[0277] Sending a first RRC connection establishment request and access parameters of the UE2 to the UE1; or,

[0278] Sending a first RRC connection establishment request carrying access parameters of the UE2 to the UE1;

[0279] The first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[0280] In an optional implementation manner of the seventh aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0281] receiving a second discovery response sent by the UE1, where the second discovery response is sent by the UE1 when determining to allow the UE2 to access the serving cell;

[0282] A unicast connection establishment request is sent to the UE1, wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0283] In an optional implementation manner of the seventh aspect, after the UE2 sends the access parameter of the UE2 to the UE1, the method further includes:

[0284] A second discovery reject is received, where the second discovery reject is sent by the UE1 when the UE1 determines to prohibit the UE2 from accessing the serving cell.

[0285] In the embodiment of the present application, the step of reselecting the relay terminal includes: sending a second discovery request in a broadcast manner; or receiving a first discovery message sent by other UEs except the UE1.

[0286] In an eighth aspect, an embodiment of the present application provides an access control method, which is applied to a UE2 side, including:

[0287] The second terminal device UE2 receives the unicast connection establishment response sent by the first terminal device UE1;

[0288] When it is determined that the UE2 is allowed to access the serving cell of the UE1, sending a first RRC connection establishment request to the UE1;

[0289] The first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[0290] In the embodiment of the present application, UE2 sends a first RRC connection establishment request to UE1, so that UE1 forwards the first RRC connection establishment request to RAN. That is, UE2 sends the first RRC connection establishment request to RAN through UE1.

[0291] In an optional implementation manner of the eighth aspect, the unicast connection establishment response includes: access control information of the serving cell;

[0292] After the UE2 receives the unicast connection establishment response sent by the UE1, the method includes:

[0293] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0294] In an optional implementation manner of the eighth aspect, before the UE2 receives the unicast connection establishment response sent by the UE1, the method includes:

[0295] Sending a unicast connection establishment request carrying the access parameters of the UE2 to the UE1; wherein the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameters of the UE2;

[0296] The unicast connection establishment response includes: a determination result of whether the UE2 is allowed to access the serving cell.

[0297] In an optional implementation manner of the eighth aspect, after the UE2 receives the unicast connection establishment response sent by the UE1, the method includes:

[0298] Sending a second side link RRC message to the UE1; wherein the second side link RRC message is used to request access control information;

[0299] Receiving a first sidelink RRC message sent by the UE1 and carrying access control information of the serving cell;

[0300] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0301] In this embodiment of the present application, the second side link RRC message may include an access control information request identifier or PLMN information of UE2.

[0302] In an optional implementation manner of the eighth aspect, after the UE2 receives the unicast connection establishment response sent by the UE1, the method includes:

[0303] Sending a third sidelink RRC message carrying the access parameters of the UE2 to the UE1; wherein the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the serving cell according to the access parameters of the UE2 and the access control information of the serving cell;

[0304] Receive a fourth side link RRC message sent by the UE1 and carrying the determination result.

[0305] In an optional implementation manner of the eighth aspect, the access parameter of the UE2 includes: PLMN information of the UE2;

[0306] The access parameter of UE2 is used to instruct UE1 to determine whether to allow UE2 to access the serving cell according to the access control information corresponding to the PLMN information and the access parameter of UE2.

[0307] In an optional implementation manner of the eighth aspect, determining whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2 includes:

[0308] Acquire access control information of the serving cell corresponding to the PLMN information of the UE2;

[0309] Determine whether to allow the UE2 to access the serving cell according to the acquired access control information and the access parameters of the UE2.

[0310] In an optional implementation manner of the eighth aspect, before the UE2 receives the unicast connection establishment response sent by the UE1, the method includes: sending PLMN information of the UE2 to the UE1;

[0311] The access control information of the serving cell includes: the access control information of the serving cell corresponding to the PLMN information of the UE2.

[0312] In an optional implementation manner of the eighth aspect, sending the PLMN information of the UE2 to the UE1 includes: sending a unicast connection establishment request carrying the PLMN information of the UE2 to the UE1.

[0313] In an optional implementation of the eighth aspect, the second sidelink RRC message includes PLMN information of the UE2;

[0314] The access control information of the serving cell includes: the access control information of the serving cell corresponding to the PLMN information of the UE2.

[0315] In an optional implementation of the eighth aspect, the method further includes:

[0316] When it is determined that the UE2 is prohibited from accessing the serving cell, a unicast connection release is sent to the UE1, or a step of reselecting a relay terminal is performed.

[0317] The unicast connection release is used to release the side link unicast connection between the UE1 and the UE2.

[0318] In an optional implementation of the eighth aspect, the release reason value in the unicast connection release is prohibited access to the cell.

[0319] In an optional implementation of the eighth aspect, the access parameters of the UE2 include: an access type AC and an access indication AI.

[0320] In a ninth aspect, an embodiment of the present application provides an access control method, which is applied to a UE2 side, including:

[0321] The second terminal device UE2 receives the unicast connection establishment response sent by the first terminal device UE1;

[0322] When it is determined that the UE2 is prohibited from accessing the serving cell of the UE1, a unicast connection release is sent to the UE1; wherein the unicast connection release is used to release the sidelink unicast connection between the UE2 and the UE1.

[0323] In an optional implementation manner of the ninth aspect, the unicast connection establishment response includes: access control information of the serving cell;

[0324] After the UE2 receives the unicast connection establishment response sent by the UE1, the method includes:

[0325] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0326] In an optional implementation manner of the ninth aspect, before the UE2 receives the unicast connection establishment response sent by the UE1, the method includes:

[0327] Sending a unicast connection establishment request carrying the access parameters of the UE2 to the UE1; wherein the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameters of the UE2;

[0328] The unicast connection establishment response includes: a determination result of whether the UE2 is allowed to access the serving cell.

[0329] In an optional implementation manner of the ninth aspect, after the UE2 receives the unicast connection establishment response sent by the UE1, the method includes:

[0330] Sending a second side link RRC message to the UE1; wherein the second side link RRC message is used to request access control information;

[0331] Receiving a first sidelink RRC message sent by the UE1 and carrying access control information of the serving cell;

[0332] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0333] In this embodiment of the present application, the second side link RRC message may include an access control information request identifier or PLMN information of UE2.

[0334] In an optional implementation manner of the ninth aspect, after the UE2 receives the unicast connection establishment response sent by the UE1, the method includes:

[0335] Sending a third sidelink RRC message carrying the access parameters of the UE2 to the UE1; wherein the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the serving cell according to the access parameters of the UE2 and the access control information of the serving cell;

[0336] Receive a fourth side link RRC message sent by the UE1 and carrying the determination result.

[0337] In an optional implementation manner of the ninth aspect, the access parameter of the UE2 includes: PLMN information of the UE2;

[0338] The access parameter of UE2 is used to instruct UE1 to determine whether to allow UE2 to access the serving cell according to the access control information corresponding to the PLMN information and the access parameter of UE2.

[0339] In an optional implementation manner of the ninth aspect, determining whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2 includes:

[0340] Acquire access control information of the serving cell corresponding to the PLMN information of the UE2;

[0341] Determine whether to allow the UE2 to access the serving cell according to the acquired access control information and the access parameters of the UE2.

[0342] In an optional implementation manner of the ninth aspect, before the UE2 receives the unicast connection establishment response sent by the UE1, the method includes: sending PLMN information of the UE2 to the UE1;

[0343] The access control information of the serving cell includes: the access control information of the serving cell corresponding to the PLMN information of the UE2.

[0344] In an optional implementation manner of the ninth aspect, sending the PLMN information of the UE2 to the UE1 includes: sending a unicast connection establishment request carrying the PLMN information of the UE2 to the UE1.

[0345] In an optional implementation of the ninth aspect, the second sidelink RRC message includes PLMN information of the UE2;

[0346] The access control information of the serving cell includes: the access control information of the serving cell corresponding to the PLMN information of the UE2.

[0347] In an optional implementation of the ninth aspect, the method further comprises:

[0348] When it is determined that the UE2 is allowed to access the serving cell, sending a first RRC connection establishment request to the UE1;

[0349] The first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the cell belongs.

[0350] In an optional implementation of the ninth aspect, the release reason value in the unicast connection release message is prohibited access to the cell.

[0351] In an optional implementation manner of the ninth aspect, after the UE2 receives the unicast connection establishment response sent by the UE1, the method further includes:

[0352] Sending a first RRC connection establishment request carrying the access parameters of the UE2 to the UE1; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the cell belongs; the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameters of the UE2;

[0353] A first RRC connection rejection is received which is sent by the UE1; the first RRC connection rejection is sent by the UE1 when determining to prohibit the UE2 from accessing the serving cell.

[0354] In an optional implementation of the ninth aspect, the connection rejection reason value in the first RRC connection rejection is prohibited access to the cell.

[0355] In an optional implementation of the ninth aspect, the method further includes: executing a step of reselecting a relay terminal.

[0356] In an optional implementation of the ninth aspect, the access parameters of the UE2 include: an access type AC and an access indication AI.

[0357] In a tenth aspect, an embodiment of the present application provides an access control method, which is applied to a UE1 side.

[0358] The first terminal device UE1 receives a unicast connection establishment request sent by the second terminal device UE2;

[0359] When it is determined that the UE2 is allowed to access the serving cell of the UE1, sending a unicast connection establishment response to the UE2;

[0360] The unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0361] In an optional implementation of the tenth aspect, the unicast connection establishment request includes access parameters of the UE2;

[0362] After the UE1 receives the unicast connection establishment request sent by the UE2, the method includes:

[0363] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0364] In an optional implementation manner of the tenth aspect, before the UE1 receives the unicast connection establishment request sent by the UE2, the method includes:

[0365] receiving an access parameter of the UE2 sent by the UE2;

[0366] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0367] In an optional implementation manner of the tenth aspect, the access parameter of the UE2 includes PLMN information of the UE2;

[0368] The determining, according to the access control information of the serving cell and the access parameter of the UE2, whether to allow the UE2 to access the serving cell includes:

[0369] Acquire access control information of the serving cell corresponding to the PLMN information of the UE2;

[0370] Determine whether to allow the UE2 to access the serving cell according to the acquired access control information and the access parameters of the UE2.

[0371] In an optional implementation manner of the tenth aspect, the receiving the access parameter of the UE2 sent by the UE2 includes:

[0372] Receive a second discovery request sent by the UE2 and carrying the access parameters of the UE2.

[0373] In an optional implementation of the tenth aspect, the method further comprises:

[0374] Receiving a first RRC connection establishment request sent by the UE2;

[0375] sending the first RRC connection establishment request to the RAN;

[0376] The first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[0377] In an optional implementation manner of the tenth aspect, before sending the first RRC connection establishment request to the UE1, the method further includes:

[0378] When the UE1 is in a non-connected state, sending a second RRC connection establishment request to the RAN;

[0379] The second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[0380] In an optional implementation of the tenth aspect, the connection establishment cause value in the second RRC connection establishment request is: relay, or the connection establishment cause value in the first RRC connection establishment request.

[0381] In an optional implementation of the tenth aspect, the method further comprises:

[0382] When the UE1 is in a non-connected state, sending a second RRC connection establishment request to the RAN;

[0383] The second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[0384] In an optional implementation of the tenth aspect, the connection establishment cause value in the second RRC connection establishment request is: relay, or the cause value for establishing the RRC connection between the UE2 and the RAN carried in the unicast connection establishment request.

[0385] In an optional implementation of the tenth aspect, the method further comprises:

[0386] When it is determined that the UE2 is prohibited from accessing the serving cell, a unicast connection rejection is sent to the UE2.

[0387] In an optional implementation of the tenth aspect, the connection rejection reason value in the unicast connection rejection is prohibited access to the cell.

[0388] In an eleventh aspect, an embodiment of the present application provides an access control method, which is applied to a UE1 side, including:

[0389] The first terminal device UE1 receives a first RRC connection establishment request sent by the second terminal device UE2; the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell of the UE1 belongs;

[0390] When it is determined that the UE2 is allowed to access the serving cell, the UE1 sends the first RRC connection establishment request to the RAN.

[0391] In an optional implementation manner of the eleventh aspect, the first RRC connection establishment request includes: an access parameter of the UE2; or, the UE1 receiving the first RRC connection establishment request sent by the UE2 includes: the UE1 receiving the first RRC connection establishment request sent by the UE2 and the access parameter of the UE2;

[0392] After the UE1 receives the first RRC connection establishment request sent by the UE2, the method includes:

[0393] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0394] In an optional implementation manner of the eleventh aspect, before the UE1 receives the first RRC connection establishment request sent by the UE2, the method includes:

[0395] receiving an access parameter of the UE2 sent by the UE2;

[0396] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0397] In an optional implementation of the eleventh aspect, the access parameter of the UE2 includes PLMN information of the UE2;

[0398] The determining, according to the access control information of the serving cell and the access parameter of the UE2, whether to allow the UE2 to access the serving cell includes:

[0399] Acquire access control information of the serving cell corresponding to the PLMN information of the UE2;

[0400] Determine whether to allow the UE2 to access the serving cell according to the acquired access control information and the access parameters of the UE2.

[0401] In an optional implementation of the eleventh aspect, the receiving the access parameters of the UE2 sent by the UE2 includes: receiving a third side link RRC message sent by the UE2 and carrying the access parameters of the UE2.

[0402] In an optional implementation manner of the eleventh aspect, before the UE1 receives the first RRC connection establishment request sent by the UE2, the method includes:

[0403] Receiving a unicast connection establishment request sent by the UE2;

[0404] Sending a unicast connection establishment response to the UE2;

[0405] The unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0406] In an optional implementation manner of the eleventh aspect, before the UE1 sends the first RRC connection establishment request to the RAN to which the serving cell belongs, the method includes:

[0407] When the UE1 is in a non-connected state, sending a second RRC connection establishment request to the RAN; wherein the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN;

[0408] Receive a second RRC connection establishment sent by the RAN.

[0409] In an optional implementation of the eleventh aspect, the connection establishment cause value in the second RRC connection establishment request is: relay, or the connection establishment cause value in the first RRC connection establishment request.

[0410] In an optional implementation of the eleventh aspect, the method further comprises:

[0411] When it is determined that the UE2 is prohibited from accessing the serving cell, a first RRC connection rejection is sent to the UE2.

[0412] In an optional implementation of the eleventh aspect, the connection rejection reason value in the first RRC connection rejection is prohibited access to the cell.

[0413] In a twelfth aspect, an embodiment of the present application provides an access control method, which is applied to a UE1 side, and the method includes:

[0414] The first terminal device UE1 receives a connection indication message sent by the second terminal device UE2; wherein the connection indication message is used to request to establish a communication connection between the UE1 and the UE2 or to request to establish a communication connection between the UE2 and the RAN to which the serving cell of the UE1 belongs;

[0415] When the UE1 is in a non-connected state, a second RRC connection establishment request is sent to the RAN, wherein the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[0416] In an optional implementation of the twelfth aspect, the connection indication message is a unicast connection establishment request; wherein the unicast connection establishment request is used to request establishment of a side link unicast connection between the UE1 and the UE2.

[0417] In an optional implementation of the twelfth aspect, the connection indication message is a first RRC connection establishment request, wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN.

[0418] In an optional implementation of the twelfth aspect, the method further includes:

[0419] Sending a unicast connection establishment response to the UE2;

[0420] A first RRC connection establishment request sent by the UE2 is received, wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN.

[0421] In an optional implementation of the twelfth aspect, the method further includes:

[0422] sending the first RRC connection establishment request to the RAN;

[0423] Receiving a first RRC connection establishment sent by the RAN;

[0424] Sending the first RRC connection establishment to the UE2;

[0425] Receive the first RRC connection establishment completion sent by the UE2;

[0426] Sending the first RRC connection establishment completion to the RAN.

[0427] In an optional implementation of the twelfth aspect, the method further includes:

[0428] receiving a second RRC connection rejection sent by the RAN;

[0429] A unicast connection rejection is sent to the UE2.

[0430] In an optional implementation of the twelfth aspect, the method further includes:

[0431] receiving a second RRC connection rejection sent by the RAN;

[0432] Send a unicast connection release to the UE2.

[0433] In an optional implementation manner of the twelfth aspect, after sending the second RRC connection establishment request to the RAN to which the serving cell of the UE1 belongs, the method further includes:

[0434] Receiving a second RRC connection establishment sent by the RAN;

[0435] Send a second RRC connection establishment completion to the RAN.

[0436] In an optional implementation of the twelfth aspect, a connection rejection reason value for the second RRC connection rejection is that relay is not supported.

[0437] In an optional implementation of the twelfth aspect, the rejection reason value of the unicast connection rejection is that relay is not supported.

[0438] In an optional implementation of the twelfth aspect, a connection release reason value for releasing the unicast connection is that relay is not supported.

[0439] In an optional implementation of the twelfth aspect, the connection indication message includes access parameters of the UE2;

[0440] After the first terminal device UE1 receives the connection indication message sent by the second terminal device UE2, the method includes: determining whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2;

[0441] The sending a second RRC connection establishment request to a RAN to which a serving cell of the UE1 belongs when the UE1 is in a non-connected state includes: sending the second RRC connection establishment request to the RAN when it is determined that the UE2 is allowed to access the serving cell and the UE1 is in a non-connected state.

[0442] In an optional implementation of the twelfth aspect, the access parameters of the UE2 include the access type AC and access indication AI of the UE2.

[0443] In a thirteenth aspect, the present application further provides an access control method, which is applied to the UE1 side, including:

[0444] The first terminal device UE1 receives a unicast connection establishment request sent by the second terminal device UE2; the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2;

[0445] A second RRC connection establishment request is sent to the RAN to which the serving cell of the UE1 belongs; the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[0446] In an optional implementation manner of the thirteenth aspect, when the UE1 is in a non-connected state, before the UE1 sends a second RRC connection establishment request to the RAN to which the serving cell belongs, the method includes:

[0447] Sending access control information of the serving cell to the UE2; wherein the access control information is used to instruct the UE1 to determine whether to allow the UE2 to access the serving cell based on the access control information of the serving cell and the access parameters of the UE2, and when it is determined that the UE2 is allowed to access the serving cell of the UE1, the UE2 sends the unicast connection establishment request to the UE1.

[0448] In an optional implementation manner of the thirteenth aspect, when the UE1 is in a non-connected state, before the UE1 sends a second RRC connection establishment request to the RAN to which the serving cell belongs, the method includes:

[0449] receiving an access parameter of the UE2 sent by the UE2; and determining whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2;

[0450] When the UE1 is in a non-connected state, the UE1 sends a second RRC connection establishment request to the RAN to which the serving cell belongs, including:

[0451] When it is determined that the UE2 is allowed to access the serving cell, the UE1 sends a second RRC connection establishment request to the RAN to which the serving cell belongs.

[0452] In an optional implementation of the thirteenth aspect, the method further comprises:

[0453] Sending a unicast connection establishment response to the UE2;

[0454] receiving a first RRC connection establishment request sent by the UE2, wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN to which the cell belongs;

[0455] Sending the first RRC connection establishment request to the RAN.

[0456] In an optional implementation of the thirteenth aspect, the method further comprises:

[0457] receiving a second RRC establishment message sent by the RAN;

[0458] Send a unicast connection establishment response to the UE2.

[0459] In an optional implementation of the thirteenth aspect, the method further comprises:

[0460] receiving a second RRC connection rejection sent by the RAN, where the second RRC connection rejection is used to indicate a rejection of establishing an RRC connection between the UE1 and the RAN;

[0461] A unicast connection rejection is sent to the UE2.

[0462] In an optional implementation of the thirteenth aspect, the rejection reason value in the unicast connection rejection is that relay is not supported.

[0463] In a fourteenth aspect, an embodiment of the present application provides an access control method, which is applied to a UE1 side, including:

[0464] The first terminal device UE1 receives a first RRC connection establishment request sent by the second terminal device UE2; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell of the UE1 belongs;

[0465] When the UE1 is in a non-connected state, a second RRC connection establishment request is sent to the RAN; wherein the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[0466] Among them, the non-connected state is an idle state or a deactivated state; when the UE1 is in the idle state, the second RRC connection establishment request is an RRC connection establishment request RRCSetupRequset message; when the UE1 is in the deactivated state, the second RRC connection establishment request is an RRC connection recovery request RRCResumeRequest message.

[0467] In an optional implementation manner of the fourteenth aspect, when the UE1 is in a non-connected state, sending a second RRC connection establishment request to the RAN includes:

[0468] When the UE1 is in a non-connected state and it is determined that the UE2 is allowed to access the serving cell of the UE1, the second RRC connection establishment request is sent to the RAN.

[0469] In an optional implementation manner of the fourteenth aspect, the first RRC connection establishment request includes: access parameters of the UE2;

[0470] After the UE1 receives the first RRC connection establishment request sent by the UE2, the method includes:

[0471] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0472] In an optional implementation manner of the fourteenth aspect, before the UE1 receives the first RRC connection establishment request sent by the UE2, the method includes:

[0473] receiving an access parameter of the UE2 sent by the UE2;

[0474] Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2.

[0475] In an optional implementation manner of the fourteenth aspect, before the UE1 receives the first RRC connection establishment request sent by the UE2, the method includes:

[0476] receiving an access parameter of the UE2 sent by the UE2;

[0477] Determining whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2;

[0478] The determination result is sent to the UE2.

[0479] In an optional implementation manner of the fourteenth aspect, before the UE1 receives the first RRC connection establishment request sent by the UE2, the method includes:

[0480] Sending access control information of the serving cell to the UE2;

[0481] The access control information of the serving cell is used to instruct the UE2 to determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameters of the UE2.

[0482] In an optional implementation manner of the fourteenth aspect, the access parameter of the UE2 includes PLMN information of the UE2;

[0483] The determining, according to the access control information of the serving cell and the access parameter of the UE2, whether to allow the UE2 to access the serving cell includes:

[0484] Acquire access control information of the serving cell corresponding to the PLMN information of the UE2;

[0485] Determine whether to allow the UE2 to access the serving cell according to the acquired access control information and the access parameters of the UE2.

[0486] In an optional implementation manner of the fourteenth aspect, before sending the access control information of the serving cell to the UE2, the method includes: receiving PLMN information of the UE2 sent by the UE2;

[0487] The sending the access control information of the serving cell to the UE2 includes: sending the access control information of the serving cell corresponding to the PLMN information of the UE2 to the UE2.

[0488] In an optional implementation manner of the fourteenth aspect, the sending the access control information of the serving cell to the UE2 includes:

[0489] A unicast connection establishment response carrying the access control information of the serving cell is sent to the UE2.

[0490] In an optional implementation manner of the fourteenth aspect, the receiving the PLMN information of the UE2 sent by the UE2 includes:

[0491] receiving a second side link RRC message sent by the UE2, where the second side link RRC message includes access control information of the serving cell corresponding to the PLMN information of the UE2;

[0492] The sending the access control information of the serving cell to the UE2 includes:

[0493] A first sidelink RRC message is sent to the UE2, where the first sidelink RRC message includes access control information of the serving cell corresponding to the PLMN information of the UE2.

[0494] In an optional implementation manner of the fourteenth aspect, the receiving the access parameter of the UE2 sent by the UE2 includes: receiving a unicast connection establishment request sent by the UE2 and carrying the access parameter of the UE2;

[0495] The sending the determination result to the UE2 includes:

[0496] Send a unicast connection establishment response carrying the determination result to the UE2.

[0497] In an optional implementation manner of the fourteenth aspect, the receiving the access parameter of the UE2 sent by the UE2 includes: receiving a third side link RRC message sent by the UE2 and carrying the access parameter of the UE2;

[0498] The sending the determination result to the UE2 includes:

[0499] Send a fourth sidelink RRC message carrying the determination result to the UE2.

[0500] In an optional implementation manner of the fourteenth aspect, before the UE1 receives the RRC connection establishment request sent by the UE2, the method includes:

[0501] Receiving a unicast connection establishment request sent by the UE2;

[0502] Sending a unicast connection establishment response to the UE2;

[0503] The unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0504] In an optional implementation of the fourteenth aspect, the connection establishment cause value in the second RRC connection establishment request is: relay, or the connection establishment cause value in the first RRC connection establishment request.

[0505] In an optional implementation manner of the fourteenth aspect, after sending the second RRC connection establishment request to the RAN, the method further includes:

[0506] Receiving a second RRC connection establishment sent by the RAN;

[0507] Sending a second RRC connection establishment completion to the RAN;

[0508] Sending the first RRC connection establishment request to the RAN.

[0509] In an optional implementation manner of the fourteenth aspect, after sending the first RRC connection establishment request to the RAN, the method further includes:

[0510] Receiving a first RRC connection establishment sent by the RAN;

[0511] Sending the first RRC connection establishment to the UE2;

[0512] Receive the first RRC connection establishment completion sent by the UE2;

[0513] Sending the first RRC connection establishment completion to the RAN.

[0514] In a fifteenth aspect, the present application provides an access control method, applied to a UE1 side, including:

[0515] The first terminal device UE1 receives a unicast connection establishment request sent by the second terminal device UE2; the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2; the unicast connection establishment request is sent by the UE2 when it is determined that the UE2 is allowed to access the serving cell of the UE1;

[0516] The UE1 sends a unicast connection establishment response to the UE2.

[0517] In an optional implementation manner of the fifteenth aspect, before the UE1 receives the unicast connection establishment request sent by the UE2, the method includes:

[0518] receiving an access parameter of the UE2 sent by the UE2;

[0519] Determining whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2;

[0520] The determination result is sent to the UE2.

[0521] In an optional implementation manner of the fifteenth aspect, before the UE1 receives the unicast connection establishment request sent by the UE2, the method includes: sending access control information of the serving cell to the UE2;

[0522] The determination result of allowing the UE2 to access the serving cell is obtained according to the access control information of the serving cell and the access parameters of the UE2.

[0523] In an optional implementation manner of the fifteenth aspect, the access parameter of the UE2 includes a PLMN of the UE2;

[0524] The determining, according to the access control information of the serving cell and the access parameter of the UE2, whether to allow the UE2 to access the serving cell includes:

[0525] Acquire access control information of the serving cell corresponding to the PLMN information of the UE2;

[0526] Determine whether to allow the UE2 to access the serving cell according to the acquired access control information and the access parameters of the UE2.

[0527] In an optional implementation manner of the fifteenth aspect, the sending the access control information of the serving cell to the UE2 includes: sending one or more access control information of the serving cell to the UE2;

[0528] The determination result of allowing the UE2 to access the serving cell is determined according to the access control information of the serving cell corresponding to the PLMN information of the UE2 and the access parameters of the UE2.

[0529] In an optional implementation manner of the fifteenth aspect, before sending the access control information of the serving cell to the UE2, the method includes: receiving PLMN information of the UE2 sent by the UE2;

[0530] The sending the access control information of the serving cell to the UE2 includes: sending the access control information of the serving cell corresponding to the PLMN information of the UE2 to the UE2.

[0531] In an optional implementation manner of the fifteenth aspect, the sending the access control information of the serving cell to the UE2 includes:

[0532] Send a first discovery message or a second discovery response carrying the access control information of the serving cell to the UE2.

[0533] In an optional implementation manner of the fifteenth aspect, the receiving the PLMN information of the UE2 sent by the UE2 includes: receiving a second discovery request sent by the UE2 and carrying the PLMN information of the UE2;

[0534] The sending the access control information of the serving cell to the UE2 includes: sending a second discovery response carrying the access control information of the serving cell to the UE2.

[0535] In an optional implementation manner of the fifteenth aspect, the receiving the access parameter of the UE2 sent by the UE2 includes:

[0536] receiving a discovery request sent by the UE2 and carrying access parameters of the UE2;

[0537] The sending the determination result to the UE2 includes:

[0538] Send a discovery response carrying the determination result to the UE2.

[0539] In an optional implementation manner of the fifteenth aspect, the receiving the access parameter of the UE2 sent by the UE2 includes:

[0540] receiving a second discovery response sent by the UE2 and carrying the access parameters of the UE2;

[0541] The sending the determination result to the UE2 includes:

[0542] Send an indication message carrying the determination result to the UE2.

[0543] In the embodiment of the present application, the indication message is an allow indication or a prohibit indication.

[0544] In an optional implementation manner of the fifteenth aspect, after the UE1 sends a unicast connection establishment response to the UE2, the method further includes:

[0545] receiving an RRC connection establishment request sent by the UE2; the RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs;

[0546] Sending the RRC connection establishment request to the RAN.

[0547] In an optional implementation manner of the fifteenth aspect, after the UE1 sends a unicast connection establishment response to the UE2, the method further includes:

[0548] receiving a first RRC connection establishment request sent by the UE2; the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs;

[0549] When the UE1 is in a non-connected state, a second RRC connection establishment request is sent to the RAN; the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[0550] In an optional implementation of the fifteenth aspect, the connection establishment cause value in the second RRC connection establishment request is: relay, or the connection establishment cause value in the first RRC connection establishment request.

[0551] In an optional implementation manner of the fifteenth aspect, after sending the second RRC connection establishment request to the RAN, the method further includes:

[0552] receiving a second RRC connection message sent by the RAN;

[0553] Sending the first RRC connection establishment request to the RAN.

[0554] In the embodiment of the present application, before sending the first RRC connection establishment request to the RAN, the method further includes: sending a second RRC connection establishment completion message to the RAN.

[0555] In an optional implementation manner of the fifteenth aspect, after sending the first RRC connection establishment request to the RAN, the method further includes:

[0556] receiving a first RRC connection establishment message sent by the RAN;

[0557] Sending the first RRC connection establishment message to the UE2;

[0558] Receiving a first RRC connection establishment completion message sent by the UE2;

[0559] Sending the first RRC connection establishment complete message to the RAN.

[0560] In a sixteenth aspect, the present application provides an access control method, which can be applied to UE1, including:

[0561] The first terminal device UE1 receives an RRC connection establishment request sent by the second terminal device UE2; the RRC connection establishment request is sent by the UE2 when it is determined that the UE2 is allowed to access the serving cell of the UE1;

[0562] The UE1 sends the RRC connection establishment request to the RAN to which the serving cell belongs;

[0563] The RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN.

[0564] In an optional implementation manner of the sixteenth aspect, before the UE1 receives the RRC connection establishment request sent by the UE2, the method includes:

[0565] receiving an access parameter of the UE2 sent by the UE2;

[0566] Determining whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameter of the UE2;

[0567] The determination result is sent to the UE2.

[0568] In an optional implementation manner of the sixteenth aspect, before the UE1 receives the RRC connection establishment request sent by the UE2, the method includes: sending access control information of the serving cell to the UE2;

[0569] The determination result of allowing the UE2 to access the serving cell is obtained according to the access control information of the serving cell and the access parameters of the UE2.

[0570] In an optional implementation manner of the sixteenth aspect, the access parameter of the UE2 includes a PLMN of the UE2;

[0571] The determining, according to the access control information of the serving cell and the access parameter of the UE2, whether to allow the UE2 to access the serving cell includes:

[0572] Acquire access control information of the serving cell corresponding to the PLMN information of the UE2;

[0573] Determine whether to allow the UE2 to access the serving cell according to the acquired access control information and the access parameters of the UE2.

[0574] In an optional implementation manner of the sixteenth aspect, the sending the access control information of the serving cell to the UE2 includes: sending one or more access control information of the serving cell to the UE2; any of the access control information includes corresponding PLMN information;

[0575] The determination result of allowing the UE2 to access the serving cell is determined according to the access control information of the serving cell whose corresponding PLMN information is the same as the PLMN information of the UE2 and the access parameters of the UE2.

[0576] In an optional implementation manner of the sixteenth aspect, before sending the access control information of the serving cell to the UE2, the method includes: receiving PLMN information of the UE2 sent by the UE2;

[0577] The sending the access control information of the serving cell to the UE2 includes: sending the access control information of the serving cell corresponding to the PLMN information of the UE2 to the UE2.

[0578] In an optional implementation of the sixteenth aspect, the sending the PLMN information of the UE2 to the UE1 includes: sending a unicast connection establishment request carrying the PLMN information of the UE2 to the UE1.

[0579] In an optional implementation manner of the sixteenth aspect, the sending the access control information of the serving cell to the UE2 includes:

[0580] A unicast connection establishment response carrying the access control information of the serving cell is sent to the UE2.

[0581] In an optional implementation manner of the sixteenth aspect, the sending the access control information of the serving cell to the UE2 includes:

[0582] A first sidelink RRC message carrying access control information of the serving cell is sent to the UE2.

[0583] In an optional implementation manner of the sixteenth aspect, the receiving the access parameter of the UE2 sent by the UE2 includes: receiving a unicast connection establishment request sent by the UE2 and carrying the access parameter of the UE2;

[0584] The sending the determination result to the UE2 includes:

[0585] Send a unicast connection establishment response carrying the determination result to the UE2.

[0586] In an optional implementation manner of the sixteenth aspect, the receiving the access parameter of the UE2 sent by the UE2 includes: receiving a second sidelink RRC message sent by the UE2 and carrying the access parameter of the UE2;

[0587] The sending the determination result to the UE2 includes:

[0588] Send a third sidelink RRC message carrying the determination result to the UE2.

[0589] In an optional implementation manner of the sixteenth aspect, before the UE1 receives the RRC connection establishment request sent by the UE2, the method includes:

[0590] Receiving a unicast connection establishment request sent by the UE2;

[0591] Sending a unicast connection establishment response to the UE2;

[0592] The unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0593] In a seventeenth aspect, the present application provides an access control method, applied to a UE1 side, including:

[0594] UE1 receives a unicast connection release sent by UE2, where the unicast connection release is used to release the sidelink unicast connection between UE1 and UE2, and the unicast connection release is sent by UE2 when it is determined that UE2 is prohibited from accessing the serving cell;

[0595] The UE1 releases the unicast connection.

[0596] In an eighteenth aspect, the present application provides an access control method, applied to a UE2 side, including:

[0597] The second terminal device UE2 sends a unicast connection establishment request to the first terminal device UE1; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2;

[0598] The UE2 receives the unicast connection establishment response sent by the UE1, where the unicast connection establishment response is sent by the UE1 when it is determined that the UE2 is allowed to access the serving cell of the UE1.

[0599] In an optional implementation manner of the eighteenth aspect, the determination result of allowing the UE2 to access the serving cell of the UE1 is obtained according to the access control information of the serving cell and the access parameter of the UE2;

[0600] Before the UE2 sends a unicast connection establishment request to the UE1, the method includes:

[0601] The UE2 sends the access parameters of the UE2 to the UE1.

[0602] In an optional implementation manner of the eighteenth aspect, the determination result of allowing the UE2 to access the serving cell of the UE1 is obtained according to the access control information of the serving cell and the access parameter of the UE2;

[0603] The unicast connection establishment request includes the access parameters of the UE2.

[0604] In an optional implementation manner of the eighteenth aspect, the access parameter of the UE2 includes PLMN information of the UE2;

[0605] The PLMN information of UE2 is used by UE1 to obtain the access control information of the service cell corresponding to the PLMN information of UE2; the determination result of allowing UE2 to access the service cell of UE1 is obtained based on the obtained access control information of the service cell and the access parameters of UE2.

[0606] In an optional implementation manner of the eighteenth aspect, the UE2 sending the access parameter of the UE2 to the UE1 includes:

[0607] The UE2 sends a discovery request or a discovery response carrying the access parameters of the UE2 to the UE1.

[0608] In an optional implementation of the eighteenth aspect, the method further comprises:

[0609] Sending a first RRC connection establishment request to the UE1;

[0610] Receiving a first RRC connection establishment sent by the UE1;

[0611] The first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[0612] In a nineteenth aspect, an embodiment of the present application provides an access control method, which is applied to a UE1 side, and the method includes:

[0613] The second terminal device UE2 sends a unicast connection establishment request to the first terminal device UE1; the unicast connection establishment request is used to request to establish a side link unicast connection between the UE2 and the UE1;

[0614] A unicast connection release is received which is sent by the UE1; the unicast connection release is sent by the UE1 when it is determined that the UE2 is prohibited from accessing the serving cell of the UE1.

[0615] In a twentieth aspect, an embodiment of the present application provides an access control method, which is applied to a UE2 side, and the method includes:

[0616] The second terminal device UE2 sends an RRC connection establishment request to the first terminal device UE1; the RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell of the UE1 belongs;

[0617] Receive the RRC connection establishment sent by the UE1; the RRC connection establishment is sent by the UE1 when determining to allow the UE2 to access the serving cell.

[0618] In a twenty-first aspect, an embodiment of the present application provides an access control method, which is applied to a UE2 side, and the method includes:

[0619] The second terminal device UE2 sends an RRC connection establishment request to the first terminal device UE1; the RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell of the UE1 belongs;

[0620] Receive an RRC connection rejection sent by the UE1; the RRC connection rejection is sent by the UE1 when determining to prohibit the UE2 from accessing the serving cell.

[0621] Wherein, after receiving the RRC connection rejection sent by the UE1, the method includes:

[0622] A unicast connection release is received from the UE1; the unicast connection release is sent by the UE1 when it is determined that the UE2 is prohibited from accessing the serving cell.

[0623] In an embodiment of the present application, a radio access network RAN ​​receives a second RRC connection establishment request sent by a first terminal device UE1; wherein the second RRC connection establishment request is used to request to establish a connection establishment request between the UE1 and the RAN;

[0624] The RAN sends a second RRC connection establishment message to the UE1;

[0625] The RAN receives a first RRC connection establishment request sent by the UE1, wherein the first RRC connection establishment request is used to request to establish a connection between the UE2 and the RAN.

[0626] In an optional implementation, the connection establishment cause value in the second RRC connection establishment request is relay, or the connection establishment cause value in the first RRC connection establishment request.

[0627] In an optional implementation manner, the second RRC connection establishment request is sent by the UE1 when the UE1 receives the first RRC connection establishment request sent by the UE2 and the UE1 is in an idle state or a deactivated state;

[0628] or,

[0629] The second RRC connection establishment request is sent by the UE1 when it receives the unicast connection establishment request sent by the UE2 and the UE1 is in an idle state or a deactivated state; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0630] In a twenty-second aspect, an embodiment of the present application further provides an access control device, including:

[0631] An acquisition module, used to acquire access control information of a serving cell of the first terminal UE1;

[0632] A sending module is used to send the access control information of the service cell to the UE2; wherein the access control information of the service cell is used by the second terminal device UE2 to determine whether to allow the UE2 to access the service cell based on the access control information of the service cell and the access parameters of the UE2.

[0633] In an optional implementation, the device also includes: a receiving module, which is used to receive the PLMN information of the UE2 sent by the UE2 before the UE1 sends the access control information of the service cell of the UE1 to the UE2; the sending module is specifically used to send the access control information of the service cell corresponding to the PLMN information of the UE2 to the UE2.

[0634] In an optional implementation, the sending module is specifically configured to send a first discovery message carrying access control information of the serving cell to the UE2.

[0635] In an optional implementation, the receiving module is specifically configured to receive a second discovery request sent by the UE2 and carrying the PLMN information of the UE2.

[0636] In an optional implementation, the sending module is specifically configured to send a second discovery response carrying access control information of the serving cell to the UE2.

[0637] In an optional embodiment, the receiving module of the device is used to receive a unicast connection establishment request sent by the UE2 after the UE1 sends the access control information of the service cell of the UE1 to the UE2; the sending module is also used to send a unicast connection establishment response to the UE2; wherein the unicast connection establishment request is sent by the UE2 when it is determined that the UE2 is allowed to access the service cell; the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0638] In an optional implementation, the receiving module is further used to receive a first RRC connection establishment request sent by the UE2; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs;

[0639] The sending module is further configured to send the first RRC connection establishment request to the RAN.

[0640] In an optional implementation, the sending module is further configured to, before sending the first RRC connection establishment request to the RAN, when the UE1 is in a non-connected state, send a second RRC connection establishment request to the RAN; wherein the second RRC connection establishment request is used to request establishment of an RRC connection between the UE1 and the RAN.

[0641] In an optional implementation, the connection establishment cause value in the second RRC connection establishment request is: relay, or the connection establishment cause value in the first RRC connection establishment request.

[0642] In an optional implementation, the receiving module is further used to receive a unicast connection establishment request sent by the UE2 after the UE1 sends the access control information of the serving cell of the UE1 to the UE2; the sending module is further used to send a second RRC connection establishment request to the RAN when the UE1 is in a non-connected state; wherein the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[0643] In an optional implementation, the receiving module is further used to receive a second RRC connection rejection sent by the RAN after sending the second RRC connection establishment request to the RAN; the sending module is further used to send a unicast connection rejection to the UE2.

[0644] In an optional implementation manner, the connection rejection reason value in the unicast connection rejection is that relay is not supported.

[0645] In an optional implementation, the connection rejection reason value in the second RRC connection rejection is that relay is not supported.

[0646] In an optional implementation, the access parameters of UE2 include: access type AC and access indication AI.

[0647] In a twenty-third aspect, an embodiment of the present application further provides an access control device, including:

[0648] A receiving module, used for receiving a discovery process message sent by the first terminal device UE1;

[0649] The sending module is used to send a unicast connection establishment request to UE1 when it is determined that the second terminal device UE2 is allowed to access the service cell of the UE1; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[0650] In an optional implementation, the device further includes: a processing module; the discovery process message includes: access control information of the service cell; the processing module is used to determine whether to allow the UE2 to access the service cell based on the access control information of the service cell and the access parameters of the UE2.

[0651] In an optional implementation, the processing module is specifically used to obtain the access control information of the service cell corresponding to the PLMN information of the UE2; and to determine whether to allow the UE2 to access the service cell based on the obtained access control information and the access parameters of the UE2.

[0652] In an optional implementation, the sending module is also used to send the PLMN information of the UE2 to the UE1 before the receiving module receives the discovery process message sent by the UE1; the access control information of the service cell includes: the access control information of the service cell corresponding to the PLMN information of the UE2.

[0653] In an optional implementation, the discovery process message is a first discovery message sent by the UE1 to the UE2.

[0654] In an optional implementation, sending the PLMN information of the UE2 to the UE1 includes: sending a second discovery request carrying the PLMN information of the UE2 to the UE1; and the discovery process message is a second discovery response carrying the access control information of the serving cell.

[0655] In an optional implementation, the receiving module is further used to receive a unicast connection establishment response sent by the UE1 after the unicast connection establishment request is sent to the UE1; the sending module is further used to send a first RRC connection establishment request to the UE1, and the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[0656] In an optional implementation, the unicast connection establishment request includes a connection establishment cause value of the RRC connection between the UE2 and the RAN; and the processing module is further configured to obtain a connection establishment cause value of the RRC connection between the UE2 and the RAN before sending the unicast connection establishment request to the UE1.

[0657] In an optional implementation, the processing module is further configured to execute a step of reselecting a relay terminal when it is determined that the UE2 is prohibited from accessing the serving cell.

[0658] In an optional implementation, the access parameters of UE2 include: access type AC and access indication AI.

[0659] On the other hand, the embodiment of the present application further provides a communication device on the terminal device side, which can be a first terminal device UE1 or a chip in UE1. The device has the function of implementing any one of the first, fourth, fifth, tenth to seventeenth aspects of the above-mentioned aspects involving UE1. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above-mentioned functions.

[0660] In a possible implementation, when the device is UE1, UE1 includes: a processor and a transceiver, wherein the processor is configured to support UE1 to perform corresponding functions in the above method. The transceiver is used to support communication between UE1 and UE2, and send information or instructions involved in the above method to UE2. Optionally, UE1 may also include a memory, which is coupled to the processor and stores necessary program instructions and data for UE1.

[0661] In a possible implementation, the device includes: a processor, a baseband circuit, a radio frequency circuit and an antenna. The processor is used to control the functions of each circuit part, and the baseband circuit is used to generate various signaling and messages, such as the first discovery message, the second discovery response, the unicast connection establishment response, the side link RRC message, etc., which are sent to UE2 via the antenna after analog conversion, filtering, amplification and up-conversion by the radio frequency circuit. Optionally, the device may also include a memory, which stores the necessary program instructions and data of UE1.

[0662] In one possible implementation, the device may include a processor and a modem. The processor can be used for instructions or an operating system to implement control of UE1 functions. The modem can encapsulate, encode, decode, modulate, demodulate, and equalize data according to a protocol to generate wireless frames to support UE1 in performing corresponding functions in any one of the first, fourth, fifth, tenth to seventeenth aspects described above.

[0663] In a possible implementation, when the device is a chip in UE1, the chip includes: a processing module and a transceiver module, the processing module may be, for example, a processor, for example, the processor is used to generate various messages and signaling, and encapsulate various messages according to the protocol, and then encode, modulate, amplify, etc. The processor may also be used for demodulation, decoding, and decapsulation to obtain signaling and messages, and the transceiver module may be, for example, an input / output interface, pin or circuit on the chip. The processing module may execute computer execution instructions stored in the storage unit to support UE1 to perform the corresponding functions in the above method. Optionally, the storage unit may be a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit in the UE1 located outside the chip, such as a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM), etc.

[0664] In a possible implementation, the apparatus includes a processor, the processor is coupled to a memory, and reads instructions in the memory and executes the method described in any one of the first aspect, the fourth aspect, the fifth aspect, the tenth aspect to the seventeenth aspect according to the instructions. The memory may be located inside the processor or outside the processor. In an example, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device executes the method described in any one of the first aspect, the fourth aspect, the fifth aspect, the tenth aspect to the seventeenth aspect and various possible implementations thereof.

[0665] On the other hand, the embodiment of the present application further provides a communication device on the terminal device side, which can be a second terminal device UE2 or a chip in UE2. The device has the function of implementing any of the second, third, sixth to eighth, and eighteenth to twenty-first aspects involving UE2. The function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more units corresponding to the above functions.

[0666] In a possible implementation, when the device is UE2, UE2 includes: a processor and a transceiver, wherein the processor is configured to support UE2 to perform corresponding functions in the above method. The transceiver is used to support communication between UE2 and UE1, and send information or instructions involved in the above method to UE1. Optionally, UE2 may also include a memory, which is coupled to the processor and stores necessary program instructions and data for UE2.

[0667] In a possible implementation, the device includes: a processor, a baseband circuit, a radio frequency circuit and an antenna. The processor is used to control the functions of each circuit part, and the baseband circuit is used to generate various signaling and messages, such as the first discovery request, the unicast connection establishment request, the side link RRC message, the first RRC connection establishment request and other messages, which are sent to UE1 via the antenna after analog conversion, filtering, amplification and up-conversion by the radio frequency circuit. Optionally, the device may also include a memory, which stores the necessary program instructions and data for UE2.

[0668] In one possible implementation, the device may include a processor and a modem. The processor can be used for instructions or an operating system to implement control of UE2 functions. The modem can encapsulate, encode, decode, modulate, demodulate, and equalize data according to the protocol to generate wireless frames to support UE2 in performing the corresponding functions of any one of the second, third, sixth to eighth, and eighteenth to twenty-first aspects mentioned above.

[0669] In a possible implementation, when the device is a chip in UE2, the chip includes: a processing module and a transceiver module, the processing module may be, for example, a processor, for example, the processor is used to generate various messages and signaling, and encapsulate various messages according to the protocol, and then encode, modulate, amplify, etc. The processor may also be used for demodulation, decoding, and decapsulation to obtain signaling and messages, and the transceiver module may be, for example, an input / output interface, pin or circuit on the chip. The processing module may execute computer execution instructions stored in the storage unit to support UE2 to perform the corresponding functions in the above method. Optionally, the storage unit may be a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit in the UE2 located outside the chip, such as a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM), etc.

[0670] In a possible implementation, the device includes a processor, the processor is coupled to a memory, and reads instructions in the memory and executes the method described in any one of the second aspect, the third aspect, the sixth aspect to the eighth aspect, and the eighteenth aspect to the twenty-first aspect according to the instructions. The memory may be located inside the processor or outside the processor, and the memory may also be located outside the device.

[0671] In another aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores instructions, and the instructions can be executed by one or more processors on a processing circuit. When the instructions are executed on a computer, the computer executes the method in any one of the first to twenty-first aspects or any possible implementation thereof.

[0672] On the other hand, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the method in any one of the first to twenty-first aspects above or any possible implementation thereof.

[0673] On the other hand, the present application provides a chip system, which includes a processor for supporting the execution of any one of the first to twenty-first aspects or any possible implementation of the method, such as generating or processing the data and / or information involved in the above aspects. In one possible design, the chip system also includes a memory, which is used to store program instructions and data necessary for the data sending device. The chip system can be composed of a chip, or it can include a chip and other discrete devices.

[0674] On the other hand, an embodiment of the present application provides a communication system, which includes the base station involved in the above aspects, a first terminal device, and a second terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0675] Figure 1A A schematic diagram of the architecture of a communication network provided in an embodiment of the present application;

[0676] Figure 1B A schematic diagram of the processing flow of the access control method provided in an embodiment of the present application;

[0677] Figure 1C A schematic diagram of a process for UE1 to obtain access control information of a serving cell from RAN in the access control method provided in an embodiment of the present application;

[0678] Figure 1D A schematic diagram of a process for UE2 to access a cell supported by RAN through UE1 provided in an embodiment of the present application;

[0679] Figure 1E A schematic diagram of a process flow for UE1 to enter a connected state from a non-connected state provided in an embodiment of the present application;

[0680] Figure 2A Schematic diagram 1 of a process for obtaining a determination result in the access control method provided in an embodiment of the present application;

[0681] Figure 2B Schematic diagram 2 of a process for obtaining a determination result in the access control method provided in an embodiment of the present application;

[0682] Figure 2C Schematic diagram 3 of the process of obtaining a determination result in the access control method provided in the embodiment of the present application;

[0683] Figure 3A Schematic diagram 1 of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application;

[0684] Figure 3B Schematic diagram 2 of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application;

[0685] Figure 3C Schematic diagram 3 of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application;

[0686] Figure 3D Schematic diagram 4 of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application;

[0687] Figure 3E Schematic diagram of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application Figure 5 ;

[0688] Figure 3F Schematic diagram of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application Figure 6 ;

[0689] Figure 3G Schematic diagram of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application Figure 7 ;

[0690] Figure 3H Schematic diagram of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application Figure 8 ;

[0691] Figure 4A Schematic diagram 1 of the processing flow of the access control method provided in the embodiment of the present application;

[0692] Figure 4B Schematic diagram 2 of the processing flow of the access control method provided in the embodiment of the present application;

[0693] Figure 4C Schematic diagram 3 of the processing flow of the access control method provided in the embodiment of the present application;

[0694] Figure 4D Schematic diagram 4 of the processing flow of the access control method provided in the embodiment of the present application;

[0695] Figure 4E Schematic diagram of the processing flow of the access control method provided in the embodiment of the present application Figure 5 ;

[0696] Figure 5 A structural diagram 1 of an access control device provided in an embodiment of the present application;

[0697] Figure 6 A second structural diagram of an access control device provided in an embodiment of the present application;

[0698] Figure 7 A third structural diagram of the access control device provided in the embodiment of the present application;

[0699] Figure 8 A schematic diagram of the structure of a terminal device provided in an embodiment of the present application;

[0700] Fig. 9 A second structural diagram of a terminal device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0701] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0702] Embodiment 1

[0703] The following first provides an exemplary description of the application scenario of the access control method provided in this application.

[0704] Figure 1A The following is a schematic diagram of the architecture of a communication network provided in an embodiment of the present application. Figure 1A As shown, the communication network includes a radio access network RAN ​​and a terminal device UE. Among them, RAN can be one or more base stations. Exemplarily, the base station can be an LTE base station or an NR base station. RAN supports one or more cells, and the cell currently accessed by the UE is the serving cell of the UE. After the UE accesses the cell, the state of the UE in the current cell can be a connected state, an idle state, or a deactivated state. Among them, when the UE is in a connected state, an RRC connection is established between the UE and the RAN.

[0705] In the embodiment of the present application, a remote terminal device (remote UE) located at the edge of a cell or with a poor signal can access the RAN through a relay terminal device (relay UE) that has already accessed the cell. The remote terminal and the relay terminal can exchange messages through a sidelink. The interface between the remote terminal and the relay terminal can be called a PC5 interface.

[0706] The access control method provided in the embodiment of the present application is described below by taking the first terminal device UE1 as a relay UE, the second terminal device UE2 as a remote UE, and UE2 accessing the serving cell of UE1 through UE1 as an example. The method provided in the embodiment of the present application can also be applied to the scenario where UE2 accesses other cells supported by RAN through UE1, and the embodiment of the present application does not limit this.

[0707] In an embodiment of the present application, whether UE2 is allowed to access the service cell of UE1 can be determined based on the access control information of the service cell of UE1 and the access parameters of UE2; then, the permission processing flow or the prohibition processing flow is executed according to the determination result. Exemplarily, when UE2 detects that it needs to initiate access, it can obtain the access parameters of UE2 from itself. For example, the access parameters may include the access type AC and access indication AI of UE2. The access control information of the cell may include a policy for whether to allow access corresponding to the combination of AC and AI. In an embodiment of the present application, the access control information of the cell may also include a policy for configuring whether to allow access based on the PLMN information of the terminal device.

[0708] Figure 1B Schematic diagram of the processing flow of the access control method provided in the embodiment of the present application. It should be noted that the execution subject involved in the processing flow can be UE1 or UE2. Figure 1B As shown, the process may include:

[0709] S1001, obtaining access control information of a serving cell.

[0710] The execution subject of this step may be UE1 or UE2. In one example, UE1 may obtain the access control information of the serving cell from RAN. In another example, after UE1 obtains the access control information of the serving cell from RAN, UE2 may obtain the access control information of the serving cell from UE1. It should be noted that Figure 1C This is a flow chart of the process of UE1 acquiring access control information of a serving cell from RAN in the access control method provided in the embodiment of the present application. Figure 1C As shown, the process of UE1 acquiring access control information of a serving cell from RAN may include: S1101, RAN sends access control information of a serving cell to UE1. S1102, UE1 acquires access control information of a serving cell. Exemplarily, RAN may broadcast access control information of one or more cells supported by RAN in each cell through a cell system message SIB. UE1 may store access control information of a serving cell.

[0711] In the embodiments of the present application, there are multiple implementation methods for the access control information of the cell.

[0712] In an optional implementation, the access control information of the cell may include: an access policy corresponding to a combination of an access type AC and an access identifier AI, wherein the access policy may be to allow access or to prohibit access.

[0713] For example, RAN may broadcast access control information of cell 0001, cell 0002, and cell 0003 supported by RAN in a system message. In one example, access control information 1 of cell 0001 includes the following information: AC1, AI1, and the corresponding access policy is allowed; in another example, access control information 2 of cell 0001 includes the following information: AC1, AI2, and the corresponding access policy is prohibited; in yet another example, access control information of cell 0002 includes the following information: AC is AC1, AI is AI1, and the corresponding access policy is allowed.

[0714] In another optional implementation, the access control information of the cell may further include: PLMN information. Including PLMN information in the access control information can help operators to implement more accurate deployment of control strategies. In one example, the access control information 3 of cell 0001 includes the following information: AC1, AI1, PLMN ID is 46001, and the corresponding access strategy is prohibited; in another example, the access control information of cell 0003 includes the following information: AC1, AI1, PLMN ID is 46000, and the corresponding access strategy is allowed.

[0715] It should be noted that when the access control information of a cell includes PLMN information, it means that the access control information can only be applied to UEs whose affiliated PLMN is a specified PLMN ID; when the access control information of a cell does not include PLMN information, it means that the access control information can be applied to UEs whose affiliated PLMN is any PLMN.

[0716] In another optional implementation, the access control information of the cell may also only include PLMN information and a corresponding access policy. In one example, the access control information of cell 0003 includes the following information: the PLMN ID is 46002, and the corresponding access policy is prohibited. The access control information indicates that any UE with any AC and AI combination whose affiliated PLMN is 46002 is allowed to access cell 0003.

[0717] S1002: Obtain access parameters of UE2.

[0718] The execution subject of this step may be UE1 or UE2. In one example, when UE2 obtains the access control information of the serving cell from UE1 in S1001, S1002 may include: UE2 can obtain its own access parameters from itself. In another example, when UE1 obtains the access control information of the serving cell in S1001, S1002 may include: UE1 can obtain the access parameters of UE2 from UE2.

[0719] For example, based on the service requirements of UE2's own non-access stratum (NAS), UE2 obtains the access parameters corresponding to the RRC connection initiated this time from its own access stratum (AS). Exemplarily, the access parameters may include a combination of an access category (AC) and an access identity (AI).

[0720] In other embodiments of the present application, the access parameter may also include PLMN information of UE2. Exemplarily, it may be a selected PLMN ID. For example, the PLMN information of UE2 is determined according to the user contract information in the SIM card of UE2, for example, it may be the identifier of the mobile operator to which UE2 has subscribed. In other embodiments of the present application, the PLMN of UE2 may also be the identifier of the mobile operator that the user supports roaming.

[0721] S1003: Determine whether to allow UE2 to access the serving cell of UE1 according to the access control information of the serving cell and the access parameters of UE2.

[0722] Exemplarily, whether to allow UE2 to access the serving cell may be determined according to the access control information of various cells shown in step S1001. In one example, reference may be made to the relevant description in section 5.3.14 of TS 38.331.

[0723] In the embodiment of the present application, it should be noted that both UE1 and UE2 can perform the above steps of determining whether access is allowed.

[0724] In an optional implementation, before executing S1003, UE1 may send access control information of the serving cell to UE2, and then UE2 determines whether to allow UE2 to access the serving cell of UE1 according to the access control information of the serving cell of UE1 and access parameters of UE2.

[0725] In another optional implementation, before executing S1003, UE2 may send access parameters of UE2 to UE1, and then UE1 determines whether to allow UE2 to access the serving cell of UE1 according to the access control information of the serving cell of UE1 and the access parameters of UE2.

[0726] Other embodiments of the present application also provide multiple implementations for UE1 and UE2 to obtain the determination result, and reference can be made to the detailed description in Embodiment 2.

[0727] S1004, executing the permission processing flow when it is determined that the access is permitted, or executing the prohibition processing flow when it is determined that the access is prohibited.

[0728] It should be noted that at each stage of the processing flow of UE2 accessing the service cell through UE1, the determination result of whether UE2 is allowed to access the service cell of UE1 can be obtained. In addition, in response to the determination result, the embodiment of the present application also provides a variety of subsequent processing flows. For example, when the determination result is allowed, UE2 is allowed to initiate the process of accessing the service cell through UE1, or UE1 is allowed to assist UE2 in completing the process of UE2 accessing the service cell through UE1; when the determination result is prohibited, UE2 is prohibited from initiating the process of accessing the service cell through UE1, or UE1 prevents UE2 from accessing the service cell through UE1.

[0729] Figure 1D The flowchart of UE2 accessing a cell supported by RAN through UE1 provided in the embodiment of the present application is as follows. Figure 1D As shown, the process of UE2 accessing the cell through UE1 may include three stages.

[0730] In the first stage, UE1 and UE2 perform a discovery process.

[0731] In the second stage, UE1 and UE2 execute the process of establishing a side link unicast connection.

[0732] In the third stage, UE1, UE2 and RAN execute a process of establishing an RRC connection between UE2 and RAN through UE1.

[0733] In the embodiments of the present application, there are multiple implementation methods for the discovery process in the first stage.

[0734] In one example, the Model A discovery process includes: UE1 sends a first discovery message to UE2. The first discovery message is used to indicate that UE1 supports being a relay UE. After receiving the first discovery message from UE1, UE2 may determine that UE1 is a relay UE.

[0735] In another example, the Model B discovery process includes: UE2 sends a second discovery request to UE1; UE1 sends a second discovery response to UE2. The second discovery request is used to indicate that UE2 requests a relay UE; the second discovery response may indicate that UE1 supports being a relay UE. After receiving the second discovery response from UE1, UE2 may determine that UE1 is a relay UE.

[0736] In an embodiment of the present application, the process of establishing a sidelink unicast connection in the second stage may include: UE2 sends a unicast connection establishment request to UE1, and the unicast connection establishment request is used to request the establishment of a sidelink unicast connection between UE1 and UE2; thereafter, UE1 sends a unicast connection establishment response to UE2, and the unicast connection establishment response can be used to indicate that the unicast connection establishment is complete. It should be noted that before UE1 sends a unicast connection establishment response to UE2, UE1 and UE2 may also perform security negotiation, for example, UE1 sends a security negotiation request to UE2, and UE2 sends a security negotiation response to UE1. In other embodiments of the present application, the step of sending a unicast connection establishment response may include interactive messages for security negotiation between UE1 and UE2, and the interactive messages for security negotiation are not shown in the drawings of the embodiments of the present application.

[0737] In the embodiment of the present application, the RRC connection establishment process in the third stage may include: UE2 sends an RRC connection establishment request to the RAN through UE1, and the RRC connection establishment request is used to request to establish an RRC connection between UE2 and the RAN; thereafter, the RAN sends an RRC connection establishment to UE2 through UE1, and then, UE2 sends an RRC connection establishment completion to the RAN through UE1, and the RRC connection establishment completion is used to indicate that the RRC connection establishment between UE2 and the RAN is completed, that is, UE2 accesses the RAN.

[0738] For example, in the process of establishing an RRC connection, the process in which UE1 forwards the interaction message between UE2 and RAN for establishing an RRC connection may be implemented as follows. In an optional implementation, UE2 sends an RRC connection establishment request to UE1; UE1 forwards the RRC connection establishment request to RAN; RAN sends an RRC connection establishment to UE1; UE1 forwards the RRC connection establishment to UE2; UE2 sends an RRC connection establishment completion to UE1; UE1 forwards the RRC connection establishment completion to RAN. It should be noted that in some application scenarios, UE1 may directly forward the above-mentioned interaction messages for establishing an RRC connection between UE2 and RAN without parsing these interaction messages.

[0739] In combination with the above three-stage processing flow, in the access control method provided in the present application, there are multiple implementation methods for the subsequent processing flow after UE1 and UE2 obtain the determination results at different stages.

[0740] In an optional implementation, when UE2 performs the above determination step, UE2 may decide whether to initiate a process of establishing a sidelink unicast connection between UE1 and UE2 to UE1 according to the determination result, or decide whether to initiate a process of establishing an RRC connection between UE2 and the RAN to which the serving cell belongs through UE1 according to the determination result. Table 1 is an illustration of the permission processing flow and the prohibition processing flow of UE2 at different stages.

[0741] Table 1

[0742]

[0743]

[0744] The first discovery message is a message sent by UE1 to UE2 in a broadcast manner during the Model A discovery process; the second discovery response is a second response message sent by UE1 to UE2 in response to the second discovery request sent by UE2 during the Model B discovery process. After UE1 and UE2 establish a sidelink unicast connection, UE1 and UE2 can also transmit cell access control information on the sidelink through a sidelink RRC (SL RRC) message.

[0745] It should be noted that, in an optional application mode, the access control information of the service cell sent by UE1 to UE2 can be used to instruct UE2 to determine whether to allow UE2 to access the service cell based on the access control information of the service cell and the access parameters of UE2. In this way, UE1 can decide whether it is necessary to perform access control on UE2's access to the service cell. In another optional application mode, UE2 can first send an information acquisition indication to UE1, and the information acquisition indication is used to instruct UE1 to send the access control information of the service cell to UE2, and then UE1 sends the access control information of the service cell to UE2. In this way, UE2 can decide whether it is necessary to perform access control on UE2's access to the service cell.

[0746] In another optional implementation, when the above determination step is performed by UE1, UE1 may determine the subsequent processing when receiving the unicast connection establishment request sent by UE2 for establishing the sidelink unicast connection according to the determination result, or determine the subsequent processing when receiving the RRC connection establishment request sent by UE2 for establishing the RRC connection between UE2 and RAN according to the determination result. Table 2 is an illustration of the permission processing flow and the prohibition processing flow of UE1 at different stages.

[0747] Table 2

[0748]

[0749] Among them, the stage in which UE1 receives the access parameters of UE2 may include: a second discovery request, a unicast connection establishment request, and a unicast second discovery request is a message sent by UE2 to UE1 in a broadcast manner during the Model B discovery process. After UE1 and UE2 establish a side link unicast connection, UE1 and UE2 can also transmit the access parameters of UE2 on the side link through a side link RRC (SL RRC) message.

[0750] It should be noted that there are multiple implementations for UE1 to receive the access parameters of UE2 during the RRC connection establishment request phase. In one example, UE2 can send an RRC connection establishment request and the access parameters of UE2 to UE1. In another example, when UE2 sends an RRC connection establishment request to RAN through UE1, it carries the access parameters of UE2 in the RRC connection establishment request and sends it to UE1. When UE1 receives the RRC connection establishment request sent by UE2, it can parse the RRC connection establishment request and extract the access parameters of UE2 therein.

[0751] For example, after UE2 sends UE2's access parameters to UE1, UE1 sends a unicast connection establishment response to UE2 when the result is determined to be allowed. When UE2 receives the unicast connection establishment response, it can be considered that UE2 is determined to be allowed to access the serving cell, and then initiates a process of establishing an RRC connection between UE2 and the RAN to which the serving cell belongs through UE1. When UE1 determines that the result is allowed, it sends a second discovery rejection to UE2, where the rejection reason value can be access to the cell is prohibited. When UE2 receives the second discovery rejection, it can be considered that UE2 is determined to be allowed to access the serving cell, and then initiates a process of establishing an RRC connection between UE2 and the RAN to which the serving cell belongs through UE1.

[0752] It should be noted that, in an optional application mode, the access parameters of UE2 sent by UE2 to UE1 can be used to instruct UE1 to determine whether to allow UE2 to access the service cell based on the access control information of the service cell and the access parameters of UE2. In this way, UE2 can decide whether it is necessary to perform access control on UE2's access to the service cell. In another optional application mode, UE1 can first send a parameter acquisition indication to UE2, and the parameter acquisition indication can be used to instruct UE2 to send UE2's access parameters to UE1, and then UE2 sends UE2's access parameters to UE1. In this way, UE1 can decide whether it is necessary to perform access control on UE2's access to the service cell.

[0753] The embodiment of the present application also provides an optional implementation method. After UE2 sends UE2's access parameters to UE1, and UE1 determines whether to allow UE2 to access the service cell based on the access control information of the service cell and the access parameters of UE2, UE1 can also send a determination result indicating whether UE2 is allowed or prohibited from accessing the service cell to UE2, and then UE2 executes subsequent steps based on the determination result. For example, UE2 can determine whether it is allowed to access the cell based on the received determination result, and execute the permission processing flow when it is determined that access is allowed, and execute the prohibition processing flow when it is determined that access is prohibited.

[0754] Table 3 is a schematic diagram of the permission processing flow and the prohibition processing flow when UE2 receives the determination result at different stages.

[0755] Table 3

[0756]

[0757] Among them, after the sidelink unicast connection is established, UE2 can send the access parameters of UE2 to UE1 through the sidelink RRC message, and UE1 can send the determination result to UE2 through the sidelink RRC message.

[0758] It should be noted that, in an optional application method, the access parameters of UE2 sent by UE2 to UE1 can be used to instruct UE1 to determine whether to allow UE2 to access the service cell based on the access control information of the service cell and the access parameters of UE2, and send the determination result to UE2. After that, UE2 can decide whether to initiate subsequent processes.

[0759] The embodiment of the present application also provides an optional implementation method. In the three-stage processing flow of UE2 accessing the cell supported by RAN through UE1, after receiving the connection indication message, if UE1 detects that it is in a non-connected state, it can instruct itself to enter a connected state.

[0760] Figure 1E A schematic diagram of a process flow of UE1 entering a connected state from a non-connected state provided in an embodiment of the present application. Figure 1E As shown, the steps of this embodiment may include:

[0761] S1401, UE2 sends a connection indication message to UE1.

[0762] The connection indication message may be used to instruct UE1 to enter a connected state to perform subsequent steps.

[0763] In one example, the connection indication message may be any one of the second discovery request, the unicast connection establishment request, the sidelink RRC message, and the first RRC connection establishment request. In another example, the connection indication message may carry indication information for indicating that UE1 enters the connected state.

[0764] It should be noted that, in the embodiment of the present application, the RRC connection establishment request sent by UE2 to UE1 is a first RRC connection establishment request, and the first RRC connection establishment request is used to request to establish an RRC connection between UE2 and the RAN.

[0765] S1402: When UE1 is in a non-connected state, UE1 sends a second RRC connection establishment request to RAN.

[0766] The second RRC connection establishment request is used to request to establish or reestablish the RRC connection between UE1 and RAN. In one example, when UE1 is in an idle state (Idle), UE1 can send an RRC connection establishment request (RRCSetupRequest) message to RAN. In another example, when UE1 is in an inactive state (Inactive), UE1 can send an RRC connection resumption (RRCResumeRequest) message to RAN.

[0767] In the embodiment of the present application, the second RRC connection establishment request may carry information such as a connection establishment cause value. In one example, if the connection indication message is the first RRC connection establishment request, the connection establishment cause value in the second RRC connection establishment request may be the connection establishment cause value in the first RRC connection establishment request, or relay; in another example, if the connection indication message is a unicast connection establishment request, the connection establishment cause value in the second RRC connection establishment request may be the connection establishment cause value for establishing the RRC connection between UE2 and RAN carried in the unicast connection establishment request.

[0768] It should be noted that after UE1 sends the second RRC connection establishment request to RAN, RAN can detect whether UE1 supports being a relay terminal, and when it is determined that UE1 supports being a relay terminal, RAN sends the second RRC connection establishment to UE1, and when it is determined that UE2 does not support being a relay terminal, RAN sends the second RRC connection rejection to UE1. Exemplarily, the connection establishment cause value in the second RRC connection establishment request can be relay, and the second RRC connection establishment request can carry UE2's PLMN information. When the PLMN information of UE2 is the same as the PLMN information of UE1, RAN determines to allow UE1 to be a relay terminal for UE2.

[0769] In the embodiment of the present application, if the RAN determines that UE1 can serve as a relay terminal for UE2, S1403 to S1405 may be further included after step S1402.

[0770] S1403, RAN sends a second RRC connection establishment to UE1.

[0771] S1404, UE1 sends a second RRC connection establishment completion message to RAN.

[0772] S1405, executing subsequent processing steps of the normal process related to the connection indication message.

[0773] Table 4 is a schematic diagram of subsequent processing steps of a normal process related to a connection indication message.

[0774] Table 4

[0775]

[0776] For different connection indication messages, the processing steps after UE1 sends the second RRC connection establishment request to RAN may include corresponding steps A1, A2, and A3.

[0777] In the embodiment of the present application, if the RAN determines that UE1 cannot serve as a relay terminal for UE2, S1406-S1407 may be further included after step S1402.

[0778] S1406, RAN sends a second RRC connection reject to UE1.

[0779] S1407, executing subsequent processing steps of the abnormal process related to the connection indication message.

[0780] Table 5 is a schematic diagram of subsequent processing steps of an abnormal process related to a connection indication message.

[0781] Table 5

[0782]

[0783]

[0784] For different connection indication messages, after UE1 sends the second RRC connection establishment request to RAN, the processing steps may include corresponding steps B1, B2, and B3.

[0785] In other embodiments of the present application, the implementation method of the three-stage processing flow of UE2 accessing the cell supported by RAN through UE1 will be described in detail. It should be noted that the second RRC connection establishment request is used to request to establish or restore the RRC connection between UE1 and RAN. Exemplarily, when UE1 is in an idle state, the second RRC connection establishment request can be an RRCSetupRequest message, and when UE1 is in a deactivated state, the second RRC connection establishment request can be an RRCResumeRequest message. Please refer to the relevant descriptions in Embodiments 3 and 4 of the present application.

[0786] By adopting a mode that UE1 sends a second RRC connection establishment request to RAN upon receiving any connection indication message so that UE1 migrates or enters a connected state, UE1 can provide a transmission channel for interactive messages for establishing an RRC connection between UE2 and RAN.

[0787] In the embodiments of the present application, various implementation methods of obtaining the determination result and the subsequent processing flow based on the determination result will be described by examples, and reference may be made to the detailed descriptions in Embodiments 3 and 4.

[0788] Embodiment 2

[0789] In the access control method provided in the embodiment of the present application, there are multiple implementation methods for UE1 and UE2 to obtain the determination result before executing the permission processing flow or the prohibition processing flow.

[0790] Figure 2A Schematic diagram 1 of a process for obtaining a determination result in the access control method provided in an embodiment of the present application. Figure 2A Flow A and flow C are schematic flows of obtaining a determination result by executing the determination step by UE1, and flow B is a schematic flow of obtaining a result by executing the determination step by UE2.

[0791] like Figure 2A As shown, process A can be used to enable UE1 to obtain a determination result. The steps of process A include:

[0792] S2003-1, UE2 sends access parameters of UE2 to UE1.

[0793] Exemplarily, UE2 may send access parameters of UE2 through a second discovery request sent by UE2 to UE1 in the first phase, a unicast connection establishment request in the second phase, a sidelink RRC message after the second phase, and an RRC connection establishment request message in the third phase. This will be described in detail in other embodiments of the present application.

[0794] S2004-1, UE1 determines whether to allow UE2 to access the serving cell according to the access control information and access parameters of the serving cell.

[0795] For details, please refer to the relevant description in S1003.

[0796] like Figure 2A As shown, process B can be used to enable UE2 to obtain a determination result. The steps of process B include:

[0797] S2003-2, UE1 sends access control information of the serving cell to UE2.

[0798] For example, UE1 may send the access control information in a broadcasting manner. Exemplarily, UE1 may broadcast periodically on the PC5 interface. Exemplarily, UE1 may send a first discovery message to UE2 through UE1 in the first phase. In an optional implementation, a new purpose identifier may be introduced for broadcasting, and the purpose identifier is used to indicate that the broadcast data is the system information of the cell. In another optional implementation, it may be indicated in the sidelink control information (SCI) that the broadcast is the system information of the cell. In yet another optional implementation, a new physical channel may be introduced to broadcast or send the access control information of the serving cell.

[0799] In an embodiment of the present application, UE1 can also send UE2's access parameters through messages such as the second discovery response sent by UE1 to UE2 in the first stage, the unicast connection establishment response in the second stage, the side link RRC message after the second stage, and the RRC connection establishment in the third stage.

[0800] In an example, UE1 may send unified access control information (Unified access control info) to UE2, which may include access control information of one or more cells. The unified access control information may refer to the definition in the TS24.501 protocol.

[0801] S2004-2, UE2 determines whether to allow UE2 to access the serving cell based on the access control information and access parameters of the serving cell.

[0802] For details, please refer to the relevant description in S1003.

[0803] like Figure 2A As shown, process C is another implementation method for UE2 to obtain the determination result. Based on process A, it also includes:

[0804] S2005, UE1 sends the determination result to UE2.

[0805] For example, there are multiple implementations for UE1 to send a determination result to UE2. In one example, the determination result may include an indication mark of permission or prohibition. In another example, UE1 may indicate that the determination result is permission by sending a message for continuing a subsequent process, or indicate that the determination result is prohibition by sending a message for prohibiting a subsequent process. Exemplarily, after UE1 receives a unicast connection establishment request, UE1 may send a unicast connection establishment response when the determination result is permission, or UE1 may send a unicast connection rejection when the determination result is prohibition.

[0806] It should be noted that UE1 and UE2 can support one or more processing flows among the above-mentioned flow A, flow B or flow C.

[0807] In the embodiment of the present application, the result of determining whether to allow UE2 to access the serving cell may also be determined based on the access control information of the serving cell corresponding to the PLMN information of UE2 and the access parameters of UE2. The method of determining whether to allow access based on the access control information corresponding to the PLMN information of UE2 can help operators achieve more accurate access control deployment.

[0808] In one example, Figure 2A Process A and process B in the embodiment can also adopt the following implementation mode.

[0809] Figure 2B Schematic diagram 2 of the process of obtaining the determination result in the access control method provided in the embodiment of the present application. After step S2002, as Figure 2B As shown, process B can also be implemented by the following steps:

[0810] S2003-1B, UE2 sends access parameters of UE2 to UE1, which include PLMN information of UE2.

[0811] The PLMN information may be a PLMN ID. Step S2003-1B may be used as Figure 2A An optional implementation of step S2003 in the embodiment of the present application. In the embodiment of the present application, UE2 can carry the PLMN of UE2 through messages such as the second discovery request sent by UE2 to UE1 in the first phase, the unicast connection establishment request in the second phase, and the sidelink RRC message after the second phase. This will be described in detail in other embodiments of the present application.

[0812] S2006, UE1 obtains the access control information of the serving cell corresponding to the PLMN information of UE2.

[0813] Among them, any access control information among the one or more access control information received by UE1 from RAN may include PLMN information. Afterwards, UE1 may obtain access control information of the service cell that can be applied to PLMN information of UE2 from the received access control information. Taking the access control information described in step S1001 as an example, if PLMN information of UE2 is 46000, UE1 may obtain access control information with a cell identifier of 0001 and PLMN information of 46000 and access control information with a cell identifier of 0001 and no PLMN information.

[0814] S2004-1B, UE1 determines whether to allow UE2 to access the serving cell according to the access control information of the serving cell corresponding to the PLMN information of UE2 and the access parameters of UE2.

[0815] For details, please refer to the relevant description in S1003.

[0816] For example, Table 6 is a schematic diagram of a set of interaction messages when UE2 sends PLMN information of UE2 to UE1.

[0817] Table 6

[0818]

[0819]

[0820] Among them, Examples 1 to 4 respectively show four messages for sending various information and the process of interaction. Among them, UE1 sending a request to report UE2's access parameter indication to UE2 is an optional step. As shown in Example 2, after UE1 receives the second discovery request from UE2, UE1 can send a request to report UE2's access parameter indication in the second discovery response, and UE2 can send UE2's access parameters to UE1 in the unicast connection establishment request. After that, UE1 can obtain the access control information of the service cell corresponding to UE2's PLMN information from the access control information of one or more cells received in advance from RAN, and then follow up the obtained access control information and UE2's AC and AI to determine whether UE2 is allowed to access the service cell. When the result is determined to be allowed, UE1 executes the permission processing flow, that is, sends a unicast connection establishment response to UE2. When the result is determined to be prohibited, UE1 executes the prohibition processing flow, that is, sends a unicast connection rejection to UE2.

[0821] Figure 2C 3 is a flow chart of obtaining a determination result in the access control method provided in the embodiment of the present application. After step S2002, as Figure 2C As shown, process A and process B can also be implemented by the following steps:

[0822] S2007, UE2 sends PLMN information of UE2 to UE1.

[0823] The PLMN information may be a PLMN ID. Exemplarily, UE2 may carry the PLMN information of UE2 and the RRC connection establishment request of the third phase through messages such as the second discovery request sent by UE2 to UE1 in the first phase, the unicast connection establishment request of the second phase, and the sidelink RRC message after the second phase. This will be described in detail in other embodiments of the present application.

[0824] S2006, UE1 obtains the access control information of the serving cell corresponding to the PLMN information of UE2.

[0825] The implementation method of this step can be found in Figure 2B A detailed description of S2006 is given in .

[0826] S2003-3, UE1 sends access control information of the serving cell corresponding to UE2's PLMN information to UE2.

[0827] In an example, when UE2 sends a second discovery request carrying PLMN information of UE2 to UE1 in step S2007, UE1 may send a second discovery response carrying access control information of a serving cell to UE2 in step S2003-3.

[0828] In one example, when UE2 sends a unicast connection establishment request carrying UE2's PLMN information to UE1 in step S2007, UE1 may send a unicast connection establishment response carrying access control information of the service cell to UE2 in step S2003-3, or, after the unicast connection establishment response, separately send a sidelink RRC message carrying the access control information of the service cell.

[0829] In an example, when UE2 sends a sidelink RRC message carrying PLMN information of UE2 to UE1 in step S2007, UE1 may send a sidelink RRC message carrying access control information of a serving cell to UE2 in step S2003-3.

[0830] In one example, when UE2 sends an RRC connection establishment request carrying UE2's PLMN information to UE1 in step S2007, UE1 may send an RRC connection establishment or sidelink RRC message carrying access control information of the serving cell to UE2 in step S2003-3.

[0831] The implementation of S2003-3 will be described in detail in other embodiments of the present application.

[0832] S2004-2B, UE2 determines whether to allow UE2 to access the serving cell according to the access control information of the serving cell corresponding to the PLMN information of UE2 and the access parameters of UE2.

[0833] For details, please refer to the relevant description in S1003.

[0834] For example, Table 7 is another schematic diagram of a set of interaction messages when UE2 sends UE2's PLMN information to UE1.

[0835] Table 7

[0836]

[0837]

[0838] Among them, Examples 5 to 8 respectively show four types of messages for sending various information and the process of interaction.

[0839] use Figure 2B and Figure 2C In any of the methods shown, the operator can further formulate a more precise access control strategy according to the PLMN information.

[0840] Embodiment 3

[0841] The following describes in detail the processing flow after obtaining the confirmation result in combination with the three stages of the access process.

[0842] In the embodiment of the present application, UE1 or UE2 can execute the steps of the permission processing flow or the prohibition processing flow according to the determination result of whether UE2 is allowed to access the serving cell. In the embodiment of the present application, before executing the permission processing flow and the prohibition processing flow, UE1 and UE2 can execute various processes for obtaining the determination results provided in the aforementioned embodiments.

[0843] The following examples illustrate how UE2 and UE1 execute the allowed processing flow or the prohibited processing flow. It should be noted that in the embodiment of the present application, UE1 and UE2 can support the allowed processing flow and the prohibited processing flow separately or simultaneously. In addition, UE1 and UE2 can support one or more allowed processing flows and prohibited processing flows provided in the embodiment of the present application separately or simultaneously. This application does not limit this.

[0844] Figure 3A Schematic diagram 1 of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application. Among them, UE2 can obtain the determination result before sending the second-stage unicast connection establishment request. Exemplarily, UE2 can obtain the determination result by any method for UE2 to obtain the determination result in the aforementioned embodiments.

[0845] like Figure 3A As shown, the steps of the permission processing flow after UE2 obtains the determination result may include:

[0846] S3011: When it is determined that UE2 is allowed to access the serving cell, UE2 sends a unicast connection establishment request to UE1.

[0847] The unicast connection establishment request is used to request to establish a side link unicast connection between UE1 and UE2.

[0848] In an embodiment of the present application, exemplarily, the process related to UE2 initiating establishment of a unicast connection can be implemented by the V2X layer of the remote terminal. It should be noted that, exemplarily, UE1 can send the access control information of UE1's service cell to UE2 through the first discovery message in the Model A discovery process or the second discovery response in the Model B discovery process. Among them, UE1's own AS layer can send the access control information of the service cell to the upper layer of the AS layer, and the upper layer of the AS layer will be packaged in the first discovery message. In other embodiments of the present application, before UE1 sends the second discovery response to UE2, UE2 can also send a second discovery response carrying UE2's PLMN information to UE1, so that UE1 sends UE2 the access control information of the service cell corresponding to UE2's PLMN information. The embodiments of the present application are not limited to this.

[0849] S3012, UE1 sends a unicast connection establishment response to UE2.

[0850] S3020, a process of establishing a first RRC connection between UE2 and RAN.

[0851] The first RRC connection is an RRC connection between UE2 and the RAN to which the serving cell belongs. This step can be implemented by using the steps performed by UE1, UE2 and RAN in the third stage.

[0852] Optionally, if UE1 is in an Idle state or an Inactive state when receiving a unicast connection establishment request, the embodiment of the present application may further include the steps shown in process D:

[0853] S3021: When UE1 is in a non-connected state, UE1 sends a second RRC connection establishment request to RAN.

[0854] Among them, the second RRC connection establishment request is used to request the establishment of an RRC connection between UE1 and RAN. The second RRC connection establishment request may carry a connection establishment cause value, which may be used to indicate that the RRC connection of UE1 this time is used as a relay terminal to help UE2 access RAN. Exemplarily, the cause value may be relay. In an embodiment of the present application, the connection establishment cause value in the second RRC connection establishment request may also be a connection establishment cause value for UE2 to establish an RRC connection with RAN carried in the unicast connection establishment request. The connection establishment cause value carried in the unicast connection establishment request may be determined by UE2 according to its own business needs that trigger the establishment of this unicast connection before sending the unicast connection establishment request. In an embodiment of the present application, exemplarily, when UE1 receives a unicast connection establishment request, the upper layer of UE1 itself may trigger the AS layer to detect whether it is in a connected state, and trigger the process of establishing an RRC connection between UE1 and RAN when UE1 is in a non-connected state. The upper layer here may be a protocol layer above the AS layer, such as a V2X layer or a PC5-S layer.

[0855] S3022, RAN sends a second RRC connection establishment to UE1.

[0856] S3023, UE1 sends a second RRC connection establishment completion message to RAN.

[0857] In various implementations of the embodiments of the present application, it should be noted that when UE1 is in the Idle state, the second RRC connection establishment request sent by UE1 to the RAN may be an RRCSetupRequest message, the second RRC connection establishment sent by the RAN to the UE1 may be an RRCSetup message, and the second RRC connection establishment completion sent by UE1 to the RAN may be an RRCSetupComplete message. When UE1 is in the Inactive state, the second RRC connection establishment request sent by UE1 to the RAN may be an RRCResumeRequest message, the second RRC connection establishment sent by the RAN to the UE1 may be an RRCResume message, and the second RRC connection establishment completion sent by UE1 to the RAN may be an RRCResumeComplete message.

[0858] It should be noted that the steps shown in the above process D can be executed before S3012 or after S3012. In some scenarios, UE1 can also execute S3021 and S3012 at the same time.

[0859] like Figure 3A As shown, the prohibition processing flow after UE2 obtains the determination result may include:

[0860] S3061: When it is determined that UE2 is prohibited from accessing the serving cell, reselect the relay terminal.

[0861] Since a unicast connection has not been established between UE1 and UE2, UE2 may try to reselect a relay terminal to access a serving cell or other RAN through other relay terminals. This embodiment of the present application does not limit this.

[0862] In an embodiment of the present application, after S3021, if RAN determines that UE1 does not support being a relay terminal for UE2, RAN may send a second RRC connection rejection to UE1, and the connection rejection reason value in the second RRC connection rejection may be, for example, not supporting relay. After that, if UE1 has not sent S3012 to UE2, UE1 may send a unicast connection rejection to UE2, wherein the connection rejection reason value in the unicast connection rejection may be, for example, not supporting relay; if UE1 has sent S3012 to UE2, UE1 may send a unicast connection release to UE2, wherein the connection release reason value of the unicast connection release may be, for example, not supporting relay. After receiving the unicast connection release or unicast connection rejection, UE1 may perform the step of reselecting the relay terminal.

[0863] In this way, UE2 only sends a unicast connection request for establishing a side link unicast connection when UE2 is allowed to access the serving cell, which can avoid unnecessary message transmission in the unicast connection stage, and can not only reduce the load of the cell, but also reduce the load of the side link and UE1.

[0864] Figure 3B Schematic diagram 2 of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application. Among them, UE2 can obtain the determination result before sending the RRC connection establishment request of the third stage. Exemplarily, UE2 can obtain the determination result by any method for UE2 to obtain the determination result in the aforementioned embodiments.

[0865] like Figure 3B As shown, before executing the allow processing flow or prohibit processing flow, including:

[0866] S3110, a process of establishing a side link unicast connection between UE1 and UE2.

[0867] This step may be implemented by using the steps performed by UE1 and UE2 in the second stage. UE2 may obtain the determination result in S3110, or may obtain the determination result through a sidelink RRC message after S3110.

[0868] In an optional implementation, after S3110, the steps of the permission processing flow after UE2 obtains the determination result may include:

[0869] S3121: When it is determined that UE2 is allowed to access the serving cell, UE2 sends a first RRC connection establishment request to UE1.

[0870] In this embodiment of the present application, the first RRC connection establishment request is used to request to establish an RRC connection between UE2 and the RAN to which the serving cell belongs.

[0871] S3131, UE1 sends a first RRC connection establishment request to RAN.

[0872] S3132, RAN sends a first RRC connection establishment to UE1.

[0873] S3122, UE1 sends a first RRC connection establishment to UE2.

[0874] S3123, UE2 sends a first RRC connection completion message to UE1.

[0875] S3133, UE1 sends a first RRC connection establishment completion message to RAN.

[0876] Among them, steps S3131-S3133 can be implemented by using the steps performed by UE1, UE2, and RAN in the third stage.

[0877] Optionally, if UE1 is in an Idle state or an Inactive state when receiving the first RRC connection establishment request, the embodiment of the present application may further include the steps shown in process D:

[0878] S3141, when UE1 is in a non-connected state, UE1 sends a second RRC connection establishment request to RAN.

[0879] S3142, RAN sends a second RRC connection establishment to UE1.

[0880] S3143, UE1 sends a second RRC connection establishment completion message to RAN.

[0881] It should be noted that the steps shown in the above process D can be performed before S3122. In some scenarios, UE1 can also perform S3141 and S3122 at the same time.

[0882] In another embodiment, if Figure 3B As shown, after S3110, the prohibition processing flow after UE2 obtains the determination result may include:

[0883] S3161: When it is determined that UE2 is prohibited from accessing the serving cell, UE2 sends a unicast connection release to UE1.

[0884] The unicast connection release is used to release the side link unicast connection between UE1 and UE2. In an example, the connection release reason value in the unicast connection release may be a prohibited cell access.

[0885] S3162: When it is determined that UE2 is prohibited from accessing the serving cell, UE2 reselects the relay terminal.

[0886] Among them, step S3162 is an optional step, and the description in S3061 can be referred to.

[0887] In an embodiment of the present application, after S3141, if RAN determines that UE1 does not support being a relay terminal for UE2, RAN may send a second RRC connection rejection to UE1, and the connection rejection reason value in the second RRC connection rejection may be, for example, not supporting relay. After that, UE1 may send a first RRC connection rejection to UE2; or, UE1 ignores the first RRC connection establishment request and sends a unicast connection release to UE2. Among them, the connection rejection reason value of the first RRC connection rejection may be, for example, not supporting relay, and the connection release reason value in the unicast connection release may be, for example, not supporting relay. After receiving the unicast connection release or the first RRC connection rejection, UE1 may release the relevant resources of the sidelink unicast connection, and then perform the relevant steps of reselecting the relay terminal.

[0888] In this way, UE2 sends the first RRC connection establishment request only when UE2 is allowed to access the serving cell, which can avoid unnecessary message transmission in the RRC connection phase, and can not only reduce the load of the cell, but also reduce the load of the side link and UE1.

[0889] Figure 3C Schematic diagram 3 of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application. Among them, UE1 can obtain the determination result before sending the second stage unicast connection establishment request. Exemplarily, UE1 can obtain the determination result by any method for UE1 to obtain the determination result in the aforementioned embodiments.

[0890] like Figure 3C As shown, before executing the allow processing flow or prohibit processing flow, including:

[0891] S3211, UE2 sends a unicast connection establishment request to UE1.

[0892] It should be noted that UE1 can obtain the determination result through any of the methods for UE2 to obtain the determination result in the foregoing embodiments. Exemplarily, UE1 can obtain the access parameters of UE2 in S3211, or obtain the access parameters of UE2 through a sidelink RRC message after S3211.

[0893] In an optional embodiment, if Figure 3C As shown, after S3211, the steps of the permission processing flow after UE1 obtains the determination result may include:

[0894] S3212: When it is determined that UE2 is allowed to access the serving cell, UE1 sends a unicast connection establishment response to UE2.

[0895] S3220, a process of establishing a first RRC connection between UE2 and RAN.

[0896] Optionally, if UE1 is in an Idle state or an Inactive state when receiving a unicast connection establishment request, the embodiment of the present application may further include the steps shown in process D:

[0897] S3221-B, when UE1 is in a non-connected state, sends a second RRC connection establishment request.

[0898] S3222, RAN sends a second RRC connection establishment message to UE1.

[0899] S3223, UE1 sends a second RRC connection establishment completion message to RAN.

[0900] It should be noted that the steps shown in the above process D can be executed before S3212 or after S3212. In some scenarios, UE1 can also execute S3221-B and S3212 at the same time.

[0901] In an optional embodiment, if Figure 3C As shown, after S3211, the prohibition processing flow after UE1 obtains the determination result may include:

[0902] S3261: When it is determined that UE2 is prohibited from accessing the serving cell, UE1 sends a unicast connection reject to UE2.

[0903] The unicast connection rejection is used to reject the establishment of a unicast connection between UE1 and UE2. In one example, the rejection reason value in the unicast connection rejection may be a prohibited cell access.

[0904] S3262, UE2 reselects the relay terminal.

[0905] In the embodiment of the present application, after S3221-B, if RAN determines that UE1 does not support being a relay terminal for UE2, RAN may send a second RRC connection rejection to UE1, and the connection rejection reason value in the second RRC connection rejection may be, for example, not supporting relay. After that, if UE1 has not sent S3212 to UE2, UE1 may send a unicast connection rejection to UE2, wherein the connection rejection reason value in the unicast connection rejection may be, for example, not supporting relay; if UE1 has sent S3212 to UE2, UE1 may send a unicast connection release to UE2, wherein the connection release reason value of the unicast connection release may be, for example, not supporting relay. After receiving the unicast connection release or unicast connection rejection, UE1 may perform the step of reselecting the relay terminal.

[0906] In this way, UE1 sends a unicast connection response for establishing a sidelink unicast connection only when UE2 is allowed to access the serving cell, thereby avoiding unnecessary message transmission in the unicast connection phase, which not only reduces the load on the cell, but also reduces the load on the sidelink and UE1.

[0907] Figure 3D Schematic diagram 4 of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application. Among them, UE1 can obtain the determination result before sending the second stage unicast connection establishment request. Exemplarily, UE1 can obtain the determination result by any method for UE1 to obtain the determination result in the aforementioned embodiments.

[0908] See Figure 3D ,and Figure 3C The method shown differs in that Figure 3C The S3221-B in Figure 3D S3321 in the example is used as an alternative implementation. That is, after receiving the unicast connection establishment request, UE1 may execute:

[0909] S3321: When it is determined that UE2 is allowed to access the serving cell and UE1 is in a non-connected state, a second RRC connection establishment request is sent.

[0910] Among them, UE1 can trigger the operation of sending a second RRC connection establishment request to RAN only when it is determined that UE2 is allowed to access the serving cell and UE1 itself is in an idle state or a deactivated state, so as to migrate its own state to a connected state.

[0911] It should be noted that S3321 may be executed before S3312 or after S3312. In some scenarios, UE1 may also execute S3321 and S3312 simultaneously.

[0912] In this way, UE1 sends the second RRC connection establishment request for establishing the RRC connection between itself and RAN only when UE2 is allowed to access the serving cell and UE1 is in a non-connected state. This can avoid unnecessary message transmission in the unicast connection phase, which can not only reduce the load of the cell, but also reduce the load of the side link and UE1. In addition, it can also migrate the state of UE1 to the connected state earlier and shorten the access time.

[0913] Figure 3E Schematic diagram of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application Figure 5 . UE1 may obtain the determination result before sending the RRC connection establishment request to the RAN in the third phase. Exemplarily, UE1 may obtain the determination result by any of the methods for UE1 to obtain the determination result in the foregoing embodiments.

[0914] like Figure 3E As shown, before executing the allow processing flow or prohibit processing flow, including:

[0915] S3410, a process of establishing a side link unicast connection between UE1 and UE2.

[0916] Among them, see Figure 3B Description of S3110.

[0917] S3421, UE1 sends a first RRC connection establishment request to UE2.

[0918] In an optional implementation, after S3421, the steps of the permission processing flow after UE1 obtains the determination result may include:

[0919] S3431: When it is determined that UE2 is allowed to access the serving cell and UE1 is in a non-connected state, UE1 sends a first RRC connection establishment request to the RAN.

[0920] S3432, RAN sends a first RRC connection establishment to UE1.

[0921] S3422, UE1 sends a first RRC connection establishment to UE2.

[0922] S3423, UE2 sends a first RRC connection completion to UE1.

[0923] S3433, UE1 sends a first RRC connection establishment completion message to RAN.

[0924] In an optional implementation, after S3421, the prohibition processing flow after UE1 obtains the determination result may include:

[0925] S3461: When it is determined that UE2 is prohibited from accessing the serving cell, a first RRC connection rejection or prohibition indication is sent to UE2.

[0926] In one example, the rejection reason value in the first RRC connection rejection may be a prohibited cell access. In another example, the prohibition indication may be sent via a sidelink RRC message or a unicast connection release. For example, the connection release reason value in the unicast connection release may be a prohibited cell access.

[0927] S3462, UE2 reselects the relay terminal.

[0928] Among them, see Figure 3B Description of S3162.

[0929] In this way, UE1 sends the first RRC connection establishment request to RAN only when UE2 is allowed to access the serving cell, which can avoid unnecessary message transmission in the RRC connection stage, and can reduce not only the load of the cell but also the load of the side link and UE1.

[0930] Figure 3F Schematic diagram of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application Figure 6 . UE1 may obtain the determination result before sending the RRC connection establishment request to the RAN in the third phase. Exemplarily, UE1 may obtain the determination result by any of the methods for UE1 to obtain the determination result in the foregoing embodiments.

[0931] It should be noted that Figure 3E The difference is that the process D' may be included before UE1 sends the first RRC connection request to RAN.

[0932] like Figure 3F As shown, before executing the allow processing flow or prohibit processing flow, including:

[0933] S3510, a process of establishing a side link unicast connection between UE1 and UE2.

[0934] S3521, UE2 sends a first RRC connection establishment request to UE1.

[0935] In an optional embodiment, if Figure 3F As shown, after S3521, the steps of the permission processing flow after UE1 obtains the determination result may include:

[0936] S3541: When it is determined that UE2 is allowed to access the serving cell and UE1 is in a non-connected state, UE1 sends a second RRC connection establishment request to the RAN.

[0937] Among them, see Figure 3D Description of S3321.

[0938] S3542, RAN sends a second RRC connection establishment to UE1.

[0939] S3543, UE1 sends a second RRC connection establishment completion message to RAN.

[0940] S3531, UE1 sends a first RRC connection establishment request to RAN.

[0941] S3532, RAN sends a first RRC connection establishment to UE1.

[0942] S3522, UE1 sends a first RRC connection establishment to UE2.

[0943] S3523, UE2 sends a first RRC connection completion message to UE1.

[0944] S3533, UE1 sends a first RRC connection establishment completion message to RAN.

[0945] In an optional embodiment, if Figure 3F As shown, after S3521, the prohibition processing flow after UE1 obtains the determination result may include:

[0946] S3561: When it is determined that UE2 is prohibited from accessing the serving cell, a first RRC connection rejection or prohibition indication is sent to UE2.

[0947] In one example, the rejection reason value in the first RRC connection rejection may be a prohibited access to the cell. In another example, the prohibition indication may be sent via a sidelink RRC message or a unicast connection release. For example, the connection release reason value in the unicast connection release may be a prohibited access to the cell.

[0948] S3562, UE2 reselects the relay terminal.

[0949] In an embodiment of the present application, after S3541, if RAN determines that UE1 does not support being a relay terminal for UE2, RAN may send a second RRC connection rejection to UE1, and the connection rejection reason value in the second RRC connection rejection may be, for example, not supporting relay. After that, UE1 may send a first RRC connection rejection to UE2; or, UE1 ignores the first RRC connection establishment request and sends a unicast connection release to UE2. Among them, the connection rejection reason value of the first RRC connection rejection may be, for example, not supporting relay, and the connection release reason value in the unicast connection release may be, for example, not supporting relay. After receiving the unicast connection release or the first RRC connection rejection, UE1 may release the relevant resources of the sidelink unicast connection, and then perform the relevant steps of reselecting the relay terminal.

[0950] In this way, when UE1 allows UE2 to access the serving cell and is in a non-connected state, it sends a second RRC connection establishment request for establishing an RRC connection between itself and the RAN, and then sends a first RRC connection establishment request to the RAN. This can avoid unnecessary message transmission in the RRC connection stage, which can not only reduce the load of the cell, but also reduce the load of the side link and UE1. In addition, it can also migrate the state of UE1 to the connected state.

[0951] Figure 3G Schematic diagram of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application Figure 7 . UE1 may obtain the determination result before sending the second phase unicast connection establishment request. Exemplarily, UE1 may obtain the determination result by any of the methods for UE1 to obtain the determination result in the aforementioned embodiments.

[0952] like Figure 3G As shown, before executing the allow processing flow or prohibit processing flow, including:

[0953] S3610, processing flow of the discovery process between UE1 and UE2.

[0954] It should be noted that UE1 may obtain the determination result by using any of the methods for UE2 to obtain the determination result in the foregoing embodiments. Exemplarily, UE1 may obtain the access control information of UE2 in S3610.

[0955] In an optional embodiment, if Figure 3G As shown, after S3610, the steps of the permission processing flow after UE1 obtains the determination result may include:

[0956] S3611, when it is determined that UE2 is allowed to access the serving cell, UE1 sends a permission indication to UE2.

[0957] S3612, UE2 sends a unicast connection establishment request to UE1.

[0958] S3613, UE1 sends a unicast connection establishment response to UE2.

[0959] S3621, UE2 sends a first RRC connection establishment request to UE1.

[0960] S3631, UE1 sends a first RRC connection establishment request to RAN.

[0961] S3632, RAN sends a first RRC connection establishment to UE1.

[0962] S3622, UE1 sends a first RRC connection establishment to UE2.

[0963] S3623, UE2 sends a first RRC connection completion message to UE1.

[0964] S3633, UE1 sends a first RRC connection establishment completion message to RAN.

[0965] Optionally, if UE1 is in an Idle state or an Inactive state when receiving the first RRC connection establishment request, the embodiment of the present application may further include the steps shown in process D':

[0966] S3641: When it is determined that UE2 is allowed to access the serving cell and UE1 is in a non-connected state, UE1 sends a second RRC connection establishment request to the RAN.

[0967] S3642, RAN sends a second RRC connection establishment to UE1.

[0968] S3643, UE1 sends a second RRC connection establishment completion message to RAN.

[0969] It should be noted that the steps shown in the above process D' can be executed before S3631.

[0970] In an optional embodiment, if Figure 3G As shown, after S3610, the prohibition processing flow after UE1 obtains the determination result may include:

[0971] S3661: When it is determined that UE2 is prohibited from accessing the serving cell, UE1 sends a prohibition indication to UE2.

[0972] In one example, the reason value of the prohibition indication may be prohibition of access to the cell.

[0973] S3662, UE2 reselects the relay terminal.

[0974] In an embodiment of the present application, after S3641, if RAN determines that UE1 does not support being a relay terminal for UE2, RAN may send a second RRC connection rejection to UE1, and the connection rejection reason value in the second RRC connection rejection may be, for example, not supporting relay. After that, UE1 may send a first RRC connection rejection to UE2; or, UE1 ignores the first RRC connection establishment request and sends a unicast connection release to UE2. Among them, the connection rejection reason value of the first RRC connection rejection may be, for example, not supporting relay, and the connection release reason value in the unicast connection release may be, for example, not supporting relay. After receiving the unicast connection release or the first RRC connection rejection, UE1 may release the relevant resources of the sidelink unicast connection, and then perform the relevant steps of reselecting the relay terminal.

[0975] In this way, UE1 sends an permission indication only when UE2 is allowed to access the service cell to instruct UE2 to send a unicast connection establishment request, which can avoid unnecessary message transmission in the unicast connection establishment stage, and can not only reduce the load of the cell, but also reduce the load of the side link and UE1.

[0976] Figure 3H Schematic diagram of the processing flow after obtaining the determination result in the access control method provided in the embodiment of the present application Figure 8 . UE1 may obtain the determination result before sending the RRC connection establishment request of the third phase. Exemplarily, UE1 may obtain the determination result by any of the methods for UE1 to obtain the determination result in the aforementioned embodiments.

[0977] like Figure 3H As shown, before executing the allow processing flow or prohibit processing flow, including:

[0978] S3710, a process of establishing a side link unicast connection between UE1 and UE2.

[0979] It should be noted that UE1 may obtain the determination result by using any of the methods for UE2 to obtain the determination result in the foregoing embodiments. Exemplarily, UE1 may obtain the access control information of UE2 in S3610.

[0980] In an optional embodiment, if Figure 3H As shown, after S3710, the steps of the permission processing flow after UE1 obtains the determination result may include:

[0981] S3711, when it is determined that UE2 is allowed to access the serving cell, UE1 sends a permission indication to UE2.

[0982] S3721, UE2 sends a first RRC connection establishment request to UE1.

[0983] S3731, UE1 sends a first RRC connection establishment request to RAN.

[0984] S3732, RAN sends a first RRC connection establishment to UE1.

[0985] S3722, UE1 sends a first RRC connection establishment to UE2.

[0986] S3723, UE2 sends a first RRC connection completion to UE1.

[0987] S3733, UE1 sends a first RRC connection establishment completion message to RAN.

[0988] Optionally, if UE1 is in an Idle state or an Inactive state when receiving the first RRC connection establishment request, before S3731, the embodiment of the present application may further include the steps shown in process D':

[0989] S3741: When it is determined that UE2 is allowed to access the serving cell and UE1 is in a non-connected state, UE1 sends a second RRC connection establishment request to the RAN.

[0990] S3742, RAN sends a second RRC connection establishment to UE1.

[0991] S3743, UE1 sends a second RRC connection establishment completion message to RAN.

[0992] In an optional embodiment, if Figure 3G As shown, after S3610, the prohibition processing flow after UE1 obtains the determination result may include:

[0993] S3761: When it is determined that UE2 is prohibited from accessing the serving cell, UE1 sends a unicast connection release to UE2.

[0994] In one example, the connection release reason value in the unicast connection release may be a prohibited cell access.

[0995] S3762, UE2 reselects the relay terminal.

[0996] In an embodiment of the present application, after S3741, if the RAN determines that UE1 does not support being a relay terminal for UE2, the RAN may send a second RRC connection rejection to UE1, and the connection rejection reason value in the second RRC connection rejection may be, for example, not supporting relay. After that, UE1 may send a first RRC connection rejection to UE2; or, UE1 ignores the first RRC connection establishment request and sends a unicast connection release to UE2. Among them, the connection rejection reason value of the first RRC connection rejection may be, for example, not supporting relay, and the connection release reason value in the unicast connection release may be, for example, not supporting relay. After receiving the unicast connection release or the first RRC connection rejection, UE1 may release the relevant resources of the sidelink unicast connection, and then perform the relevant steps of reselecting the relay terminal.

[0997] In this way, UE1 sends an permission indication only when UE2 is allowed to access the service cell to instruct UE2 to send an RRC connection establishment request, which can avoid unnecessary message transmission during the RRC connection establishment phase, and can not only reduce the load on the cell, but also reduce the load on the side link and UE1.

[0998] Embodiment 4

[0999] The access control method provided in the embodiment of the present application is illustrated below using a specific example.

[1000] Figure 4A Schematic diagram 1 of the processing flow of the access control method provided in the embodiment of the present application. Figure 4A As shown, the steps of the embodiment of the present application include:

[1001] S4111, UE2 sends a unicast connection establishment request carrying access parameters of UE2 to UE1.

[1002] Exemplarily, the access parameters of UE2 may include AC and AI. Optionally, the access parameters of UE2 may also include PLMNID of UE2.

[1003] S4110, UE1 determines whether to allow UE2 to access the service cell based on the access control information of the service cell and the access parameters of UE2; when the determination result is permission, the steps of the permission processing flow are executed; when the determination result is prohibition, the steps of the prohibition processing flow are executed.

[1004] When the access parameter of UE2 includes the PLMN of UE2, UE1 can determine whether to allow UE2 to access the serving cell according to the access control information of the serving cell corresponding to the PLMN of UE2. Please refer to the relevant description in the first embodiment.

[1005] like Figure 4A As shown, the steps of the permission processing flow may include:

[1006] S4112: When it is determined that UE2 is allowed to access the serving cell, UE1 sends a unicast connection establishment response to UE2.

[1007] S4120, a process of establishing a first RRC connection between UE2 and RAN.

[1008] Optionally, if UE1 is in an Idle state or an Inactive state when receiving a unicast connection establishment request, the embodiment of the present application may further include the steps shown in process D:

[1009] S4121-B, when UE1 is in a non-connected state, UE1 sends a second RRC connection establishment request to RAN.

[1010] S4122, RAN sends a second RRC connection establishment to UE1.

[1011] S4123, UE1 sends a second RRC connection establishment completion message to RAN.

[1012] It should be noted that the steps shown in the above process D can be executed before S4112 or after S4112. In some scenarios, UE1 can also execute S4121-B and S4112 at the same time.

[1013] like Figure 4A As shown, the steps of the prohibition process may include:

[1014] S4161: When it is determined that UE2 is prohibited from accessing the serving cell, UE1 sends a unicast connection reject to UE2.

[1015] The unicast connection rejection is used to reject the establishment of a unicast connection between UE1 and UE2. In one example, the connection rejection reason value in the unicast connection rejection may be a prohibited cell access.

[1016] S4162, UE2 reselects the relay terminal.

[1017] In an embodiment of the present application, after S4121-B, if RAN determines that UE1 does not support being a relay terminal for UE2, RAN may send a second RRC connection rejection to UE1, and the connection rejection cause value in the second RRC connection rejection may be, for example, not supporting relay. After that, if UE1 has not sent S4112 to UE2, UE1 may send a unicast connection rejection to UE2, wherein the connection rejection cause value in the unicast connection rejection may be, for example, not supporting relay; if UE1 has sent S4112 to UE2, UE1 may send a unicast connection release to UE2, wherein the connection release cause value of the unicast connection release may be, for example, not supporting relay. After receiving the unicast connection release or unicast connection rejection, UE1 may perform the step of reselecting the relay terminal.

[1018] In this way, UE1 can obtain the access parameters of UE2 in the unicast connection establishment request and determine whether UE2 is allowed to access the service cell. After that, a unicast connection response for establishing a side link unicast connection can be sent only when UE2 is allowed to access the service cell. This can avoid unnecessary message transmission in the unicast connection stage, which can not only reduce the load on the cell, but also reduce the load on the side link and UE1.

[1019] Figure 4B Schematic diagram 2 of the processing flow of the access control method provided in the embodiment of the present application. Figure 4B As shown, the steps of the embodiment of the present application include:

[1020] S4200, a process of establishing a side link unicast connection between UE1 and UE2.

[1021] For this step, please refer to the description of the implementation method of the second stage.

[1022] S4201, UE2 sends a sidelink RRC message carrying access parameters of UE2 to UE1.

[1023] Exemplarily, the access parameters of UE2 may include AC and AI. Optionally, the access parameters of UE2 may also include PLMNID of UE2.

[1024] S4202, UE1 determines whether to allow UE2 to access the serving cell based on the access control information of the serving cell and the access parameters of UE2; when the determination result is permission, the steps of the permission processing flow are executed; when the determination result is prohibition, the steps of the prohibition processing flow are executed.

[1025] When the access parameter of UE2 includes the PLMN of UE2, UE1 can determine whether to allow UE2 to access the serving cell according to the access control information of the serving cell corresponding to the PLMN of UE2. Please refer to the relevant description in the first embodiment.

[1026] like Figure 4B As shown, the steps of the permission processing flow may include:

[1027] S4211, when it is determined that UE2 is allowed to access the serving cell, UE1 sends a permission indication to UE2.

[1028] S4221, UE2 sends a first RRC connection establishment request to UE1.

[1029] S4231, UE1 sends a first RRC connection establishment request to RAN.

[1030] S4232, RAN sends a first RRC connection establishment to UE1.

[1031] S4222, UE1 sends a first RRC connection establishment to UE2.

[1032] S4223, UE2 sends a first RRC connection completion message to UE1.

[1033] S4233, UE1 sends a first RRC connection establishment completion message to RAN.

[1034] Optionally, if UE1 is in an Idle state or an Inactive state when receiving the first RRC connection establishment request, before S4231, the embodiment of the present application may further include the steps shown in process D':

[1035] S4241: When it is determined that UE2 is allowed to access the serving cell and UE1 is in a non-connected state, UE1 sends a second RRC connection establishment request to the RAN.

[1036] S4242, RAN sends a second RRC connection establishment to UE1.

[1037] S4243, UE1 sends a second RRC connection establishment completion message to RAN.

[1038] like Figure 4B As shown, the steps of the prohibition process may include:

[1039] S4261: When it is determined that UE2 is prohibited from accessing the serving cell, UE1 sends a unicast connection release to UE2.

[1040] In one example, the connection release reason value in the unicast connection release may be a prohibited cell access.

[1041] S4262, UE2 reselects the relay terminal.

[1042] In an embodiment of the present application, after S4241, if RAN determines that UE1 does not support being a relay terminal for UE2, RAN may send a second RRC connection rejection to UE1, and the connection rejection reason value in the second RRC connection rejection may be, for example, not supporting relay. After that, UE1 may send a first RRC connection rejection to UE2; or, UE1 ignores the first RRC connection establishment request and sends a unicast connection release to UE2. Among them, the connection rejection reason value of the first RRC connection rejection may be, for example, not supporting relay, and the connection release reason value in the unicast connection release may be, for example, not supporting relay. After receiving the unicast connection release or the first RRC connection rejection, UE1 may release the relevant resources of the sidelink unicast connection, and then perform the relevant steps of reselecting the relay terminal.

[1043] In this way, UE1 obtains the access parameters of UE2 in the side link RRC message after the unicast connection is established, and determines whether UE2 is allowed to access the service cell. Afterwards, an permission indication can be sent only when UE2 is allowed to access the service cell to instruct UE2 to send an RRC connection establishment request, thereby avoiding unnecessary message transmission in the RRC connection establishment stage, which can not only reduce the load on the cell, but also reduce the load on the side link and UE1.

[1044] Figure 4C Schematic diagram 2 of the processing flow of the access control method provided in the embodiment of the present application. Figure 4C As shown, the steps of the embodiment of the present application may include:

[1045] S4310, a process of establishing a side link unicast connection between UE1 and UE2.

[1046] Among them, see Figure 3B Description of S3110.

[1047] S4321, UE1 sends a first RRC connection establishment request carrying access parameters of UE2 to UE2.

[1048] Exemplarily, the access parameters of UE2 may include AC and AI. Optionally, PLMN information of UE2 may also be included. In other embodiments of the present application, UE2 may also send a first RRC connection establishment request carrying the access parameters of UE2 to UE1. When UE1 receives the first RRC connection establishment request carrying the access parameters of UE2 sent by UE2, UE1 may parse the access parameters of UE2 from the first RRC connection establishment request.

[1049] S4320, UE1 determines whether to allow UE2 to access the service cell based on the access control information of the service cell and the access parameters of UE2; when the determination result is permission, the steps of the permission processing flow are executed; when the determination result is prohibition, the steps of the prohibition processing flow are executed.

[1050] When the access parameter of UE2 includes the PLMN of UE2, UE1 can determine whether to allow UE2 to access the serving cell according to the access control information of the serving cell corresponding to the PLMN information of UE2. Please refer to the relevant description in the first embodiment.

[1051] like Figure 4C As shown, the steps of the permission processing flow may include:

[1052] S4331: When it is determined that UE2 is allowed to access the serving cell and UE1 is in a non-connected state, UE1 sends a first RRC connection establishment request to the RAN.

[1053] S4332, RAN sends a first RRC connection establishment to UE1.

[1054] S4322, UE1 sends a first RRC connection establishment to UE2.

[1055] S4323, UE2 sends a first RRC connection completion message to UE1.

[1056] S4333, UE1 sends a first RRC connection establishment completion message to RAN.

[1057] like Figure 4C As shown, the steps of the prohibition process may include:

[1058] S4361: When it is determined that UE2 is prohibited from accessing the serving cell, a first RRC connection rejection or prohibition indication is sent.

[1059] In one example, the rejection reason value in the first RRC connection rejection may be a prohibited cell access. In another example, the prohibition indication may be sent via a sidelink RRC message or a unicast connection release. For example, the connection release reason value in the unicast connection release may be a prohibited cell access.

[1060] S3262, UE2 reselects the relay terminal.

[1061] For details, please refer to the description of S3162 in FIG. 3 .

[1062] In this way, UE1 sends the first RRC connection establishment request to RAN only when UE2 is allowed to access the serving cell, which can avoid unnecessary message transmission in the RRC connection stage, and can reduce not only the load of the cell but also the load of the side link and UE1.

[1063] In this way, UE1 obtains the access parameters of UE2 from the RRC connection establishment request and determines whether UE2 is allowed to access the serving cell. After that, the RRC connection establishment request can be sent to the RAN only when UE2 is allowed to access the serving cell, thereby avoiding unnecessary message transmission in the RRC connection establishment phase, which can not only reduce the load of the cell, but also reduce the load of the side link and UE1.

[1064] Figure 4D Schematic diagram 3 of the processing flow of the access control method provided in the embodiment of the present application. Figure 4D As shown, the steps of the embodiment of the present application may include:

[1065] S4400, UE1 sends a first discovery message carrying access control information of a serving cell to UE2.

[1066] The implementation of the access control information of the serving cell can refer to the description in Embodiment 1. In the embodiment of the present application, UE1 can also use a new physical channel to send the access control information of the serving cell to UE2, and the present application does not limit this.

[1067] S4401, UE2 determines whether to allow UE2 to access the service cell based on the access control information of the service cell and the access parameters of UE2; when the determination result is allowed, the steps of the permission processing flow are executed; when the determination result is prohibited, the steps of the prohibition processing flow are executed.

[1068] For details, please refer to the related description in the first embodiment.

[1069] It should be noted that, as an optional alternative implementation of S4400, UE2 may send a second discovery request carrying UE2's PLMN information to UE1, and UE1 sends access control information of the serving cell corresponding to UE2's PLMN information to UE2. Afterwards, S4401 may include: UE2 determines whether to allow UE2 to access the serving cell according to the access control information of the serving cell corresponding to UE2's PLMN information and the access parameters of the serving cell.

[1070] like Figure 4D As shown, the steps of the permission processing flow may include:

[1071] S4411: When it is determined that UE2 is allowed to access the serving cell, UE2 sends a unicast connection establishment request.

[1072] The unicast connection establishment request is used to request to establish a side link unicast connection between UE1 and UE2.

[1073] S4412, UE1 sends a unicast connection establishment response to UE2.

[1074] S4420, a process of establishing a first RRC connection between UE2 and RAN.

[1075] The first RRC connection is an RRC connection between UE2 and the RAN to which the serving cell belongs. This step can be implemented by using the steps performed by UE1, UE2 and RAN in the third stage.

[1076] Optionally, if UE1 is in an Idle state or an Inactive state when receiving a unicast connection establishment request, the embodiment of the present application may further include the steps shown in process D:

[1077] S4421: When UE1 is in a non-connected state, UE1 sends a second RRC connection establishment request to RAN.

[1078] The second RRC connection establishment request is used to request to establish an RRC connection between UE1 and RAN. The second RRC connection establishment request may carry a connection establishment cause value, which may be used to indicate that the current RRC connection of UE1 is used as a relay terminal to help UE2 access RAN. Exemplarily, the cause value may be relay.

[1079] S4422, RAN sends a second RRC connection establishment to UE1.

[1080] S4423, UE1 sends a second RRC connection establishment completion message to RAN.

[1081] It should be noted that the steps shown in the above process D can be executed before S4412 or after S4412. In some scenarios, UE1 can also execute S4421 and S4412 at the same time.

[1082] like Figure 4D As shown, the steps of the prohibition process may include:

[1083] S4461: When it is determined that UE2 is prohibited from accessing the serving cell, reselect the relay terminal.

[1084] Since a unicast connection has not been established between UE1 and UE2, UE2 may try to reselect a relay terminal to access a serving cell or other RAN through other relay terminals. This embodiment of the present application does not limit this.

[1085] In this way, UE2 only sends a unicast connection request for establishing a side link unicast connection when UE2 is allowed to access the serving cell, which can avoid unnecessary message transmission in the unicast connection stage, and can not only reduce the load of the cell, but also reduce the load of the side link and UE1.

[1086] In an embodiment of the present application, after S4421, if RAN determines that UE1 does not support being a relay terminal for UE2, RAN may send a second RRC connection rejection to UE1, and the connection rejection cause value in the second RRC connection rejection may be, for example, not supporting relay. After that, if UE1 has not sent S4412 to UE2, UE1 may send a unicast connection rejection to UE2, wherein the connection rejection cause value in the unicast connection rejection may be, for example, not supporting relay; if UE1 has sent S4412 to UE2, UE1 may send a unicast connection release to UE2, wherein the connection release cause value of the unicast connection release may be, for example, not supporting relay. After receiving the unicast connection release or unicast connection rejection, UE1 may perform the step of reselecting the relay terminal.

[1087] In this way, UE2 obtains the access control information of the service cell during the discovery process and determines whether UE2 is allowed to access the service cell. After that, a unicast connection establishment request can be sent only when UE2 is allowed to access the service cell. This can avoid unnecessary message transmission during the unicast connection and RRC connection establishment stages, which can not only reduce the load on the cell, but also reduce the load on the side link and UE1.

[1088] Figure 4E Schematic diagram 4 of the processing flow of the access control method provided in the embodiment of the present application.

[1089] S4510, UE2 sends a unicast connection establishment request to UE1.

[1090] S4511, UE1 sends a unicast connection establishment response to UE2.

[1091] S4512, UE2 sends a side link RRC message carrying an information acquisition indication to UE1.

[1092] The information acquisition indication may be used to instruct UE1 to send access control information of the serving cell to UE2. In one example, the information acquisition indication may be the PLMN information of UE2. The PLMN information of UE2 is used to instruct UE1 to send access control information of the serving cell corresponding to the PLMN information of UE2 to UE2. In an embodiment of the present application, exemplarily, after executing S4512, UE2 may wait for UE1 to execute S4514, and then, after determining that it is allowed to access the serving cell, execute the sending of the RRC connection establishment request.

[1093] It should be noted that S4512 is not a step that must be performed in the embodiment of the present application. In another example, UE2 may also send an information acquisition indication or UE2's PLMN information through a unicast connection establishment request, that is, step S4510 may include: UE2 sends a unicast connection establishment request carrying an information acquisition indication or UE2's PLMN information to UE1.

[1094] S4514, UE1 sends a sidelink RRC message carrying access control information of the serving cell to UE2.

[1095] It should be noted that when the unicast connection establishment request carries UE2's PLMN information or UE2 sends a sidelink RRC message carrying UE2's PLMN information to UE1, UE1 can send access control information of the service cell corresponding to UE2's PLMN information to UE2.

[1096] S4515, UE2 determines whether to allow UE2 to access the serving cell based on the access control information of the serving cell and the access parameters of UE2; when the determination result is allowed, the permission processing flow is executed; when the determination result is prohibited, the prohibition processing flow is executed.

[1097] For details, please refer to the related description in the first embodiment.

[1098] like Figure 4E As shown, the steps of the permission processing flow may include:

[1099] In an optional implementation, after S4510, the steps of the permission processing flow after UE2 obtains the determination result may include:

[1100] S4521: When it is determined that UE2 is allowed to access the serving cell, UE2 sends a first RRC connection establishment request to UE1.

[1101] In this embodiment of the present application, the first RRC connection establishment request is used to request to establish an RRC connection between UE2 and the RAN to which the serving cell belongs.

[1102] S4531, UE1 sends a first RRC connection establishment request to RAN.

[1103] S4532, RAN sends a first RRC connection establishment to UE1.

[1104] S4522, UE1 sends a first RRC connection establishment to UE2.

[1105] S4523, UE2 sends a first RRC connection completion message to UE1.

[1106] S4533, UE1 sends a first RRC connection establishment completion message to RAN.

[1107] Among them, steps S4531-S4533 can be implemented by using the steps performed by UE1, UE2, and RAN in the third stage.

[1108] Optionally, if UE1 is in an Idle state or an Inactive state when receiving the first RRC connection establishment request, the embodiment of the present application may further include the steps shown in process D:

[1109] S4541, when UE1 is in a non-connected state, UE1 sends a second RRC connection establishment request to RAN.

[1110] S4542, RAN sends a second RRC connection establishment to UE1.

[1111] S4543, UE1 sends a second RRC connection establishment completion message to RAN.

[1112] It should be noted that the steps shown in the above process D can be executed before S4522.

[1113] In another embodiment, if Figure 3A As shown, after S4510, the prohibition processing flow after UE2 obtains the determination result may include:

[1114] S4561: When it is determined that UE2 is prohibited from accessing the serving cell, UE2 sends a unicast connection release to UE1.

[1115] The unicast connection release is used to release the side link unicast connection between UE1 and UE2. In an example, the connection release reason value in the unicast connection release may be a prohibited cell access.

[1116] S4562: When it is determined that UE2 is prohibited from accessing the serving cell, UE2 reselects the relay terminal.

[1117] Among them, step S4562 is an optional step, and the description in S3061 can be referred to.

[1118] In an embodiment of the present application, after S4541, if RAN determines that UE1 does not support being a relay terminal for UE2, RAN may send a second RRC connection rejection to UE1, and the connection rejection reason value in the second RRC connection rejection may be, for example, not supporting relay. After that, UE1 may send a first RRC connection rejection to UE2; or, UE1 ignores the first RRC connection establishment request and sends a unicast connection release to UE2. Among them, the connection rejection reason value of the first RRC connection rejection may be, for example, not supporting relay, and the connection release reason value in the unicast connection release may be, for example, not supporting relay. After receiving the unicast connection release or the first RRC connection rejection, UE1 may release the relevant resources of the sidelink unicast connection, and then perform the relevant steps of reselecting the relay terminal.

[1119] In this way, UE2 sends the first RRC connection establishment request only when UE2 is allowed to access the serving cell, which can avoid unnecessary message transmission in the RRC connection phase, and can not only reduce the load of the cell, but also reduce the load of the side link and UE1.

[1120] In this way, UE2 obtains the access control information of the service cell during the unicast connection establishment phase or by using the side link RRC message, and determines whether UE2 is allowed to access the service cell. Afterwards, an RRC connection establishment request can be sent only when UE2 is allowed to access the service cell, thereby avoiding unnecessary message transmission during the RRC connection establishment phase, which can not only reduce the load on the cell, but also reduce the load on the side link and UE1.

[1121] For other technical solution details and technical effects of the embodiments of the present application, please refer to the description in other embodiments of the present application.

[1122] Embodiment 5

[1123] The embodiment of the present application provides a communication device, which may be an access control device applied to UE1 or UE2. The access control device provided in the embodiment of the present application is exemplarily described below.

[1124] Figure 5 The first structural diagram of the access control device provided in the embodiment of the present application. Figure 5 As shown, the access control device 500 may include: an acquisition module 501 and a sending module 502 .

[1125] In the embodiment of the present application, the apparatus 500 may further include: a receiving module 503, a processing module 504, and a storage module 505. The storage module 505 may be used to store instructions and data.

[1126] See Figure 5The structure shown in the figure is a first access control device provided in an embodiment of the present application, which can be applied to the UE1 side, wherein:

[1127] An acquisition module, which can be used to acquire access control information of a serving cell of the first terminal UE1;

[1128] The sending module can be used to send the access control information of the service cell of the UE1 to the second terminal device UE2; wherein the access control information of the service cell is used by the UE2 to determine whether to allow the UE2 to access the service cell based on the access control information of the service cell and the access parameters of the UE2.

[1129] In an optional implementation of the first access control device, the receiving module can be used to receive the PLMN information of the UE2 sent by the UE2 before the UE1 sends the access control information of the service cell of the UE1 to the UE2; the sending module can be used to send the access control information of the service cell corresponding to the PLMN information of the UE2 to the UE2.

[1130] In an optional implementation manner of the first access control device, the sending module may be configured to send a first discovery message carrying access control information of the serving cell to the UE2.

[1131] In an optional implementation manner of the first access control device, the receiving module may be configured to receive a second discovery request sent by the UE2 and carrying the PLMN information of the UE2.

[1132] In an optional implementation manner of the first access control device, the sending module may be configured to send a second discovery response carrying the access control information of the serving cell to the UE2.

[1133] In an optional implementation of the first access control device, the receiving module can be used to receive a unicast connection establishment request sent by the UE2 and carrying the PLMN information of the UE2; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[1134] In an optional implementation of the first access control device, the sending module can be used to send a unicast connection establishment response carrying the access control information of the service cell to the UE2; wherein the unicast connection establishment response is used to indicate that the side link unicast connection between the UE1 and the UE2 is established.

[1135] In an optional implementation manner of the first access control device, the receiving module may be configured to receive a second side link RRC message sent by the UE2 and carrying the PLMN information of the UE2.

[1136] In an optional implementation manner of the first access control device, the sending module may be configured to send a first sidelink RRC message carrying access control information of the serving cell to the UE2.

[1137] In an optional implementation of the first access control device, a receiving module may be used to receive a unicast connection establishment request sent by the UE2 after the UE1 sends the access control information of the service cell of the UE1 to the UE2; a sending module may be used to send a unicast connection establishment response to the UE2; wherein the unicast connection establishment request is sent by the UE2 when it is determined that the UE2 is allowed to access the service cell; and the unicast connection establishment request is used to request establishment of a side link unicast connection between the UE1 and the UE2.

[1138] In an optional implementation of the first access control device, the receiving module can be used to receive a first RRC connection establishment request sent by the UE2; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs; and the sending module can be used to send the first RRC connection establishment request to the RAN.

[1139] In an optional implementation manner of the first access control device, a receiving module may be used to receive a first RRC connection establishment request sent by UE2 after UE1 sends access control information of a serving cell of UE1 to UE2; wherein the first RRC connection establishment request is sent by UE2 when it is determined that UE2 is allowed to access the serving cell; the first RRC connection establishment request is used to request establishment of an RRC connection between UE2 and a RAN to which the cell belongs; and the sending module may be used to send the first RRC connection establishment request to the RAN.

[1140] In an optional implementation manner of the first access control device, the sending module may be configured to send a second RRC connection establishment request to the RAN when the UE1 is in a non-connected state before sending the first RRC connection establishment request to the RAN; wherein the second RRC connection establishment request is used to request establishment of an RRC connection between the UE1 and the RAN.

[1141] In an optional implementation manner of the first access control device, the connection establishment cause value in the second RRC connection establishment request is: relay, or the connection establishment cause value in the first RRC connection establishment request.

[1142] In an optional implementation of the first access control device, the receiving module can be used to receive a unicast connection release sent by the UE2 after the UE1 sends the access control information of the serving cell of the UE1 to the UE2; wherein the unicast connection release is sent by the UE2 when it is determined that the UE2 is prohibited from accessing the serving cell; the unicast connection release is used to request the release of the sidelink unicast connection between the UE1 and the UE2. In the embodiment of the present application, the processing module 504 can be used to release the sidelink unicast connection locally in the UE1.

[1143] In an optional implementation manner of the first access control device, a connection release reason value in the unicast connection release is a prohibited access to a cell.

[1144] In an optional implementation manner of the first access control device, the receiving module may be used to receive a unicast connection establishment request sent by the UE2 after the UE1 sends the access control information of the serving cell of the UE1 to the UE2; the sending module may be used to send a second RRC connection establishment request to the RAN when the UE1 is in a non-connected state; wherein the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[1145] In an optional implementation manner of the first access control device, the receiving module may be used to receive a second RRC connection rejection sent by the RAN after sending the second RRC connection establishment request to the RAN; the sending module may be used to send a unicast connection rejection to the UE2.

[1146] In an optional implementation manner of the first access control device, the receiving module may be used to receive a first RRC connection establishment request sent by the UE2 after the UE1 sends the access control information of the serving cell of the UE1 to the UE2; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs; and the sending module may be used to send a second RRC connection establishment request to the RAN when the UE1 is in a non-connected state; wherein the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

[1147] In an optional implementation manner of the first access control device, the receiving module may be used to receive a second RRC connection rejection sent by the RAN after the second RRC connection establishment request is sent to the RAN; the processing module may be used to send a unicast connection release to the UE2.

[1148] In an optional implementation manner of the first access control device, a connection rejection reason value in the unicast connection rejection is relay not supported.

[1149] In an optional implementation manner of the first access control device, a connection release reason value in the unicast connection release is relay not supported.

[1150] In an optional implementation manner of the first access control device, the connection rejection reason value in the second RRC connection rejection is that relay is not supported.

[1151] In an optional implementation manner of the first access control device, the access parameters of the UE2 include: an access type AC and an access indication AI.

[1152] In an optional implementation of the first access control device, the receiving module may be configured to receive access control information of at least one cell sent by the RAN before the UE1 sends the access control information of the serving cell of the UE1 to the UE2, the at least one cell including the serving cell of the UE1.

[1153] For other technical solution details and technical effects of the embodiments of the present application, please refer to the description in other embodiments of the present application.

[1154] Figure 6 The second structural diagram of the access control device provided in the embodiment of the present application. Figure 6 As shown, the access control device 600 may include: a sending module 602 and a receiving module 603. In the embodiment of the present application, the device 600 may also include a processing module 604, an acquisition module 601, and a storage module 605. The storage module 605 may be used to store instructions and data.

[1155] See Figure 6 The structure shown in the figure, the second access control device provided in the embodiment of the present application can be applied to the UE2 side, wherein:

[1156] A receiving module, configured to receive access control information of a serving cell of the first terminal UE1 sent by the first terminal UE1;

[1157] The processing module is configured to determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameters of the UE2.

[1158] In the embodiment of the present application, the processing module can also be used to execute the permission processing flow when it is determined that the UE2 is allowed to access the service cell; or execute the prohibition processing flow when it is determined that the UE2 is prohibited from accessing the service cell.

[1159] In an optional implementation of the second access control device, the sending module can be used to send the PLMN information of the UE2 to the UE1 before the UE2 receives the access control information of the service cell of the UE1 sent by the UE1; the receiving module can be used to receive the access control information of the service cell corresponding to the PLMN information of the UE2 sent by the UE1.

[1160] In an optional implementation of the second access control device, the receiving module can be used to receive a first discovery message sent by the UE1 and carrying the access control information of the service cell of the UE1; the sending module can also be used to send a unicast connection establishment request to the UE1 when it is determined that the UE2 is allowed to access the service cell; or, the processing module can be used to execute the step of reselecting the relay terminal when it is determined that the UE2 is prohibited from accessing the service cell.

[1161] In an optional implementation manner of the second access control device, the sending module may be configured to send a second discovery request carrying the PLMN information of the UE2 to the UE1.

[1162] In an optional implementation manner of the second access control device, the receiving module is configured to receive a second discovery response sent by the UE1 and carrying access control information of a serving cell of the UE1;

[1163] A sending module may be used to send a unicast connection establishment request to the UE1 when it is determined that the UE2 is allowed to access the service cell, wherein the unicast connection establishment request is used to request the establishment of a side link unicast connection between the UE1 and the UE2; or, a processing module may be used to execute the step of reselecting the relay terminal when it is determined that the UE2 is prohibited from accessing the service cell.

[1164] In an optional implementation of the second access control device, the sending module can be used to send a unicast connection establishment request carrying the PLMN information of the UE2 to the UE1; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[1165] In an optional implementation manner of the second access control device, the receiving module is configured to receive a unicast connection establishment response sent by the UE1 and carrying access control information of a serving cell of the UE1, wherein the unicast connection establishment response is used to indicate that the sidelink unicast connection between the UE1 and the UE2 is established;

[1166] The sending module may be used to send a first RRC connection establishment request to the UE1 when it is determined that the UE2 is allowed to access the serving cell, wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN; or, the sending module may be used to send a unicast connection release to the UE1 when it is determined that the UE2 is prohibited from accessing the serving cell, wherein the unicast connection release is used to request to release the sidelink unicast connection between the UE1 and the UE2.

[1167] In an optional implementation manner of the second access control device, the sending module may be configured to send a second sidelink RRC message carrying the PLMN information of the UE2 to the UE1.

[1168] In an optional implementation manner of the second access control device, the receiving module is configured to receive a first sidelink RRC message sent by the UE1 and carrying access control information of a serving cell of the UE1;

[1169] Correspondingly, the sending module may be used to send a first RRC connection establishment request to the UE1 when it is determined that the UE2 is allowed to access the serving cell, wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN; or, the sending module may be used to send a unicast connection release to the UE1 when it is determined that the UE2 is prohibited from accessing the serving cell, wherein the unicast connection release is used to request to release the sidelink unicast connection between the UE1 and the UE2.

[1170] In an optional implementation manner of the second access control device, the receiving module may be used to receive a unicast connection establishment response sent by the UE1 after the UE2 sends the unicast connection establishment request to the UE1; the sending module may be used to send a first RRC connection establishment request to the UE1, wherein the first RRC connection establishment request is used to request establishment of an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[1171] In an optional implementation of the second access control device, the receiving module can be used to receive the first RRC connection establishment sent by the UE1 after sending the first RRC connection establishment request to the UE1; the sending module can be used to send the first RRC connection establishment completion to the UE1.

[1172] In an optional implementation of the second access control device, a receiving module may be used to receive a first RRC connection rejection sent by the UE1 after sending the first RRC connection establishment request to the UE1, wherein the first RRC connection rejection is sent when the UE1 is prohibited from being a relay terminal; a sending module may be used to send a unicast connection release to the UE1, wherein the unicast connection release is used to release the side link unicast connection between the UE1 and the UE2; and a processing module may be used to execute the step of reselecting the relay terminal.

[1173] In an optional implementation of the second access control device, a receiving module can be used to receive a unicast connection release sent by the UE1, wherein the unicast connection release is sent when the UE1 is prohibited from serving as a relay terminal, and the unicast connection release is used to release the side link unicast connection between the UE1 and the UE2; a processing module can be used to execute the step of reselecting the relay terminal.

[1174] In an optional implementation manner of the second access control device, the connection release reason value in the unicast connection release is prohibited access to the cell.

[1175] In an optional implementation manner of the second access control device, the access parameters of the UE2 include: access type AC and access indication AI.

[1176] See Figure 5 The structure shown in the figure, the third access control device provided in the embodiment of the present application can be applied to the UE2 side, wherein:

[1177] The acquisition module can be used to obtain the access parameters of UE2.

[1178] The sending module may be used to send the access parameters of the UE2 to the UE1, wherein the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell of the UE1 and the access parameters of the UE2.

[1179] In an optional implementation manner of the third access control device, the access parameters of the UE2 include the access type AC and access indication AI of the UE2.

[1180] In an optional implementation of the third access control device, the access parameters of UE2 also include PLMN information of UE2; wherein the PLMN information of UE2 is used to indicate whether to allow UE2 to access the service cell based on the access parameters of UE2 and the access control information of the service cell corresponding to the PLMN information of UE2.

[1181] In an optional implementation manner of the third access control device, the sending module may be configured to send a second discovery request carrying access parameters of the UE2 to the UE1.

[1182] In an optional implementation of the third access control device, the sending module can be used to send a unicast connection establishment request carrying the access parameters of the UE2 to the UE1; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[1183] In an optional implementation manner of the third access control device, the sending module may be configured to send a third sidelink RRC message carrying access parameters of the UE2 to the UE1.

[1184] In an optional implementation of the third access control device, the sending module can be used to send a first RRC connection establishment request and the access parameters of the UE2 to the UE1; or, send a first RRC connection establishment request carrying the access parameters of the UE2 to the UE1; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the service cell belongs.

[1185] In an optional implementation of the third access control device, a receiving module may be used to receive a second discovery response sent by UE1 after UE2 sends the access parameters of UE2 to UE1, wherein the second discovery response is sent by UE1 when it determines that UE2 is allowed to access the service cell; a sending module may be used to send a unicast connection establishment request to UE1; wherein the unicast connection establishment request is used to request establishment of a side link unicast connection between UE1 and UE2.

[1186] In an optional implementation of the third access control device, a receiving module may be used to receive a second discovery rejection sent by UE1 after UE2 sends the access parameters of UE2 to UE1, wherein the second discovery rejection is sent by UE1 when it determines to prohibit UE2 from accessing the service cell.

[1187] In an optional implementation of the third access control device, a receiving module can be used to receive a second discovery response sent by UE1 after UE2 sends the access parameters of UE2 to UE1, and the second discovery response includes a determination result of whether UE2 is allowed to access the service cell.

[1188] In an optional implementation of the third access control device, a sending module may be used to send a unicast connection establishment request to the UE1 when the determination result is to allow the UE2 to access the service cell; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2; or, a processing module may be used to execute the step of reselecting the relay terminal when the determination result is to prohibit the UE2 from accessing the service cell.

[1189] In an optional implementation manner of the third access control device, a receiving module may be used to receive a unicast connection establishment response sent by UE1 after UE2 sends the access parameters of UE2 to UE1, wherein the unicast connection establishment response is sent by UE1 when it determines that UE2 is allowed to access the service cell; a sending module may be used to send a first RRC connection establishment request to UE1; wherein the first RRC connection establishment request is used to request establishment of an RRC connection between UE2 and the RAN to which the service cell belongs.

[1190] In an optional implementation of the third access control device, a receiving module may be used to receive a unicast connection rejection sent by UE1 after UE2 sends the access parameters of UE2 to UE1, wherein the unicast connection rejection is sent by UE1 when UE1 determines to prohibit UE2 from accessing the service cell.

[1191] In an optional implementation of the third access control device, a receiving module can be used to receive a unicast connection establishment request response sent by UE1 after UE2 sends the access parameters of UE2 to UE1, and the unicast connection establishment response includes a determination result of whether UE2 is allowed to access the service cell.

[1192] In an optional implementation of the third access control device, a receiving module can be used to receive a fourth side link RRC message sent by UE1 after UE2 sends the access parameters of UE2 to UE1, and the fourth side link RRC message includes a determination result of whether UE2 is allowed to access the service cell.

[1193] In an optional implementation of the third access control device, the sending module can be used to send a first RRC connection establishment request to the UE1 when it is determined that the UE2 is allowed to access the service cell; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the service cell belongs; or, the sending module can be used to send a unicast connection release to the UE1 when it is determined that the UE2 is prohibited from accessing the service cell; wherein the unicast connection release is used to release the side link unicast connection between the UE1 and the UE2.

[1194] In an optional implementation of the third access control device, a receiving module may be used to receive a first RRC connection establishment sent by UE1 after UE2 sends the access parameters of UE2 to UE1, wherein the first RRC connection establishment is sent by UE1 when UE1 determines that UE2 is allowed to access the service cell; and a sending module may be used to send a first RRC connection establishment completion to UE1.

[1195] In an optional implementation of the third access control device, after the UE2 sends the access parameters of the UE2 to the UE1, the receiving module can be used to receive a first RRC connection rejection sent by the UE1, where the first RRC connection rejection is sent by the UE1 when it is determined that the UE2 is prohibited from accessing the service cell; or, the receiving module can be used to receive a prohibition indication sent by the UE1, where the prohibition indication is used to indicate that the UE2 is prohibited from accessing the service cell.

[1196] In an optional implementation manner of the third access control device, the rejection reason value in the second discovery rejection is prohibiting access to the cell.

[1197] In an optional implementation manner of the third access control device, the connection rejection reason value in the unicast connection rejection is prohibited access to the cell.

[1198] In an optional implementation manner of the third access control device, a connection release reason value of the unicast connection release is a prohibited access to the cell.

[1199] In an optional implementation manner of the third access control device, the connection rejection reason value in the first RRC connection rejection is prohibited access to the cell.

[1200] In an optional implementation of the third access control device, the receiving module can be used to receive a unicast connection rejection sent by the UE1 after the UE2 sends the access parameters of the UE2 to the UE1, and the connection rejection reason value in the unicast connection rejection is that relay is not supported.

[1201] In an optional implementation of the third access control device, the receiving module can be used to receive a unicast connection release sent by the UE1 after the UE2 sends the access parameters of the UE2 to the UE1, and the rejection reason value in the unicast connection release is that relay is not supported.

[1202] In an optional implementation manner of the third access control device, the processing module can be used to execute the step of reselecting the relay terminal.

[1203] For other technical solution details and technical effects of the embodiments of the present application, please refer to the description in other embodiments of the present application.

[1204] Figure 7 The second structural diagram of the access control device provided in the embodiment of the present application. Figure 7 As shown, the access control device 600 may include: a receiving module 703 and a processing module 704. In the embodiment of the present application, the device 700 may also include a sending module 702, an acquisition module 701, and a storage module 705. The storage module 705 may be used to store instructions and data.

[1205] See Figure 7 The structure shown in the figure, the fourth access control device provided in the embodiment of the present application can be applied to the UE1 side, wherein:

[1206] A receiving module, configured to receive access parameters of the second terminal device UE2 sent by the UE2;

[1207] The processing module is configured to determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell of the UE1 and the access parameter of the UE2.

[1208] In an optional implementation manner of the fourth access control device, the access parameters of the UE2 include the AC and AI of the UE2.

[1209] In an optional implementation of the fourth access control device, the access parameters of UE2 include PLMN information of UE2; a processing module can be used to determine whether to allow UE2 to access the service cell based on the access control information of the service cell corresponding to the PLMN information of UE2 and the access parameters of UE2.

[1210] In an optional implementation of the fourth access control device, a sending module may be used to send a determination result to the UE2 after the UE1 receives the access parameter of the UE2 sent by the UE2; wherein the determination result is used to indicate whether the UE2 is allowed or prohibited from accessing the serving cell. In an embodiment of the present application, the sending module may be used to send a permission indication to the UE2 when it is determined that the UE2 is allowed to access the serving cell; or, the sending module may be used to send a prohibition indication to the UE2 when it is determined that the UE2 is prohibited from accessing the serving cell.

[1211] In an optional implementation manner of the fourth access control device, the receiving module can be used to: receive a second discovery request sent by the UE2 and carrying the access parameters of the UE2; or, receive a unicast connection establishment request sent by the UE2 and carrying the access parameters of the UE2; or, receive a first side link RRC message sent by the UE2 and carrying the access parameters of the UE2; or, receive a first RRC connection establishment request sent by the UE2 and carrying the access parameters of the UE2.

[1212] In an optional implementation of the fourth access control device, the receiving module can be used to receive a second discovery request sent by the UE2 and carrying the access parameters of the UE2; the sending module can be used to send a second discovery response to the UE2 when it is determined that the UE2 is allowed to access the service cell after the UE1 determines whether to allow the UE2 to access the service cell based on the access control information of the service cell of the UE1 and the access parameters of the UE2; or, when it is determined that the UE2 is prohibited from accessing the service cell, send a second discovery rejection to the UE2. In the embodiment of the present application, the second discovery response can be used to instruct the UE2 to send a unicast connection establishment request to the UE1.

[1213] In an optional implementation of the fourth access control device, a receiving module can be used to receive a unicast connection establishment request sent by the UE2 and carrying the access parameters of the UE2; wherein the unicast connection establishment request is used to request to establish a sidelink unicast connection between the UE1 and the UE2; a sending module can be used to send a unicast connection establishment response to the UE2 when it is determined that the UE2 is allowed to access the service cell after the UE1 determines whether to allow the UE2 to access the service cell based on the access control information of the service cell of the UE1 and the access parameters of the UE2; or, when it is determined that the UE2 is prohibited from accessing the service cell, send a unicast connection rejection to the UE2. In an embodiment of the present application, the unicast connection establishment response can be used to instruct the UE2 to send a first RRC connection establishment request to the UE1.

[1214] In an optional implementation of the fourth access control device, a receiving module can be used to receive a third side link RRC message sent by the UE2 and carrying the access parameters of the UE2; a sending module can be used to send a fourth side link RRC message carrying the determination result to the UE2; wherein the determination result is to allow or prohibit the UE2 from accessing the service cell.

[1215] In an optional implementation manner of the fourth access control device, a receiving module may be used to receive a first RRC connection establishment request sent by the UE2 and carrying the access parameters of the UE2; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the service cell belongs; a sending module may be used to, after the UE1 determines whether to allow the UE2 to access the service cell based on the access control information of the service cell of the UE1 and the access parameters of the UE2, send the first RRC connection establishment request to the RAN to which the service cell belongs when it is determined that the UE2 is allowed to access the service cell; or, when it is determined that the UE2 is prohibited from accessing the service cell, send a first RRC connection rejection or a unicast connection release to the UE2; wherein the unicast connection release is used to release the sidelink unicast connection between the UE1 and the UE2.

[1216] In an optional implementation manner of the fourth access control device, the connection rejection reason value in the unicast connection rejection is prohibited access to the cell.

[1217] In an optional implementation manner of the fourth access control device, the connection rejection reason value in the first RRC connection rejection is prohibited access to the cell.

[1218] In an optional implementation manner of a fourth access control device, a sending module may be used to send a second RRC connection establishment request to the RAN when it is determined that the UE2 is allowed to access the service cell and the UE1 is in a non-connected state; wherein the second RRC connection establishment request is used to request establishment of an RRC connection between the UE1 and the RAN; the receiving module may be used to receive the second RRC connection establishment sent by the RAN; and the sending module may also be used to send the first RRC connection establishment request to the RAN.

[1219] In an optional implementation manner of the fourth access control device, the connection establishment cause value in the second RRC connection establishment request is relay, or the connection establishment cause value in the first RRC connection establishment request.

[1220] See Figure 6The structure shown in the figure, the fifth access control device provided in the embodiment of the present application can be applied to the UE1 side, wherein:

[1221] A receiving module, configured to receive access parameters of UE2 sent by UE2;

[1222] A sending module, configured to send to UE2 a determination result of whether to allow UE2 to access the serving cell of UE1;

[1223] The determination result is obtained according to the access parameter of the UE2 and the access control information of the serving cell.

[1224] In an optional implementation manner of the fifth access control device, the access parameters of UE2 include AC and AI of UE2.

[1225] In an optional implementation manner of the fifth access control device, the access parameters of the UE2 include the PLMN information of the UE2; and the determination result is obtained based on the access control information of the serving cell corresponding to the PLMN information of the UE2 and the access parameters of the UE2.

[1226] In an optional implementation manner of the fifth access control device, the receiving module may be configured to receive a second discovery request sent by the UE2 and carrying the access parameters of the UE2.

[1227] In an optional implementation manner of the fifth access control device, the receiving module may be configured to receive a unicast connection establishment request sent by the UE2 and carrying the access parameters of the UE2.

[1228] In an optional implementation manner of the fifth access control device, the receiving module may be configured to receive a third side link RRC message sent by the UE2 and carrying the access parameters of the UE2.

[1229] In an optional implementation manner of the fifth access control device, the sending module may be configured to send a second discovery response carrying the determination result to the UE2.

[1230] In an optional implementation manner of the fifth access control device, the sending module may be configured to send a unicast connection establishment response carrying the determination result to the UE2.

[1231] In an optional implementation manner of the fifth access control device, the sending module can be used to send a fourth side link RRC message carrying the determination result to the UE2.

[1232] In an optional implementation of the fifth access control device, a sending module may be used to send a second discovery response to the UE2 when the determination result is allowed; wherein the second discovery response is used to indicate that the determination result is allowed; or, when the determination result is prohibited, send a second discovery rejection to the UE2; wherein the second discovery rejection is used to indicate that the determination result is prohibited.

[1233] In an optional implementation of the fifth access control device, the sending module can be used to send a unicast connection establishment response to the UE2 when the determination result is allowed; wherein the unicast connection establishment response is used to indicate that the determination result is allowed; or, when the determination result is prohibited, send a unicast connection rejection to the UE2; wherein the unicast connection rejection is used to indicate that the determination result is prohibited.

[1234] In an optional implementation of the fifth access control device, the receiving module can be used to receive the first RRC connection establishment request sent by the UE2 and carrying the access parameters of the UE2; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the service cell of the UE1 belongs.

[1235] In an optional implementation manner of the fifth access control device, the sending module can be used to send a first RRC connection establishment message carrying the determination result to the UE2.

[1236] See Figure 6 The structure shown in the figure, the sixth access control device provided in the embodiment of the present application can be applied to the UE2 side, wherein:

[1237] A receiving module, which can be used for the second terminal device UE2 to receive a discovery process message sent by the first terminal device UE1;

[1238] The sending module can be used to send a unicast connection establishment request to UE1 when it is determined that the UE2 is allowed to access the serving cell of the UE1; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[1239] In the embodiment of the present application, the discovery process message may be used to determine whether the UE2 is allowed to access the serving cell of the UE1.

[1240] In the embodiment of the present application, UE1 sends access control information of a serving cell of UE1 to UE2; the access control information of the serving cell may be used to instruct UE2 to determine whether to allow UE2 to access the serving cell of UE1.

[1241] In an optional implementation manner of the sixth access control device, the processing module can be used to determine whether to allow the UE2 to access the serving cell based on the access control information of the serving cell and the access parameters of the UE2 in the discovery process message.

[1242] In an optional implementation of the sixth access control device, a sending module may be used to send the access parameters of the UE2 to the UE1 before the UE2 receives the discovery process message sent by the UE1; wherein the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the service cell based on the access control information of the service cell and the access parameters of the UE2; the discovery process message received by the receiving module includes: a determination result of whether the UE2 is allowed to access the service cell.

[1243] In an optional implementation manner of the sixth access control device, the access parameters of the UE2 include: access type AC and access indication AI.

[1244] In an optional implementation manner of the sixth access control device, the access parameters of the UE2 include: the PLMN information of the UE2; wherein the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the service cell based on the access control information corresponding to the PLMN information and the access parameters of the UE2.

[1245] In an optional implementation of the sixth access control device, an acquisition module can be used to obtain the access control information of the service cell corresponding to the PLMN information of the UE2; a processing module can be used to determine whether to allow the UE2 to access the service cell based on the acquired access control information and the access parameters of the UE2.

[1246] In an optional implementation of the sixth access control device, the sending module can be used to send the PLMN information of the UE2 to the UE1 before the UE2 receives the discovery process message sent by the UE1; the access control information of the service cell received by the receiving module includes: the access control information of the service cell corresponding to the PLMN information of the UE2.

[1247] In an optional implementation manner of the sixth access control device, the discovery process message is a first discovery message sent by the UE1 to the UE2.

[1248] In an optional implementation of the sixth access control device, the sending module can be used to send a second discovery request carrying the PLMN information of the UE2 to the UE1; the discovery process message is a second discovery response carrying the access control information of the serving cell.

[1249] In an optional implementation manner of the sixth access control device, the sending module can be used to send a second discovery request carrying the access parameters of the UE2 to the UE1; and the discovery process message is a second discovery response carrying the determination result.

[1250] In an optional implementation manner of the sixth access control device, the receiving module may be used to receive a unicast connection establishment response sent by the UE1; the sending module may be used to send a first RRC connection establishment request to the UE1, wherein the first RRC connection establishment request is used to request establishment of an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[1251] In an optional implementation manner of the sixth access control device, the acquisition module may be used to acquire a cause value for establishing the RRC connection between the UE2 and the RAN before sending the unicast connection establishment request to the UE1; the unicast connection establishment request includes the cause value for establishing the RRC connection between the UE2 and the RAN.

[1252] In this embodiment of the present application, the connection establishment cause value of the second RRC connection establishment request sent by UE1 to the RAN may be relay, or the cause value for establishing the RRC connection between the UE2 and the RAN carried in the unicast connection establishment request, or the connection establishment cause value of the first RRC connection establishment request.

[1253] In an optional implementation manner of the sixth access control device, the processing module may be configured to execute a step of reselecting a relay terminal when it is determined that the UE2 is prohibited from accessing the serving cell.

[1254] See Figure 7 The structure shown in the figure, the seventh access control device provided in the embodiment of the present application can be applied to the UE2 side, wherein:

[1255] A receiving module, which can be used to receive a discovery process message sent by UE1;

[1256] The processing module is configured to execute the step of reselecting a relay terminal when it is determined that the UE2 is prohibited from accessing the serving cell of the UE1.

[1257] In an optional implementation manner of the seventh access control device, the access parameters of the UE2 include the access type AC and access indication AI of the UE2.

[1258] In an optional implementation manner of the seventh access control device, the access parameters of the UE2 include the PLMN information of the UE2; wherein the PLMN information of the UE2 is used to instruct the UE1 to determine whether to allow the UE2 to access the service cell based on the access parameters of the UE2 and the access control information of the service cell corresponding to the PLMN information of the UE2.

[1259] In an optional implementation manner of the seventh access control device, the sending module may be configured to send a second discovery request carrying access parameters of the UE2 to the UE1.

[1260] In an optional implementation of the seventh access control device, the sending module can be used to send a unicast connection establishment request carrying the access parameters of the UE2 to the UE1; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[1261] In an optional implementation manner of the seventh access control device, the sending module may be configured to send a third sidelink RRC message carrying access parameters of the UE2 to the UE1.

[1262] In an optional implementation manner of the seventh access control device, the sending module may be used to send a first RRC connection establishment request and the access parameters of the UE2 to the UE1; or, to send a first RRC connection establishment request carrying the access parameters of the UE2 to the UE1; wherein the first RRC connection establishment request is used to request establishment of an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[1263] In an optional implementation of the seventh access control device, a receiving module may be used to receive a second discovery response sent by UE1 after UE2 sends the access parameters of UE2 to UE1, wherein the second discovery response is sent by UE1 when it determines that UE2 is allowed to access the service cell; a sending module may be used to send a unicast connection establishment request to UE1; wherein the unicast connection establishment request is used to request establishment of a side link unicast connection between UE1 and UE2.

[1264] In an optional implementation of the seventh access control device, the receiving module can be used to receive a second discovery rejection sent by the UE1 after the UE2 sends the access parameters of the UE2 to the UE1, and the second discovery rejection is sent by the UE1 when it is determined that the UE2 is prohibited from accessing the serving cell. In the embodiment of the present application, the processing module performs the step of reselecting the relay terminal, instructing the sending module to send the second discovery request in a broadcast manner; or instructing the receiving module to receive the first discovery message sent by other UEs except the UE1.

[1265] See Figure 6 The structure shown in the figure, the eighth access control device provided in the embodiment of the present application can be applied to the UE2 side, wherein:

[1266] A receiving module, which can be used to receive a unicast connection establishment response sent by UE1;

[1267] The sending module can be used to send a first RRC connection establishment request to the UE1 when it is determined that the UE2 is allowed to access the serving cell of the UE1; wherein the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[1268] In the embodiment of the present application, UE2 sends a first RRC connection establishment request to UE1, so that UE1 forwards the first RRC connection establishment request to RAN. That is, UE2 sends the first RRC connection establishment request to RAN through UE1.

[1269] In an optional implementation of the eighth access control device, the unicast connection establishment response includes: access control information of the service cell; a processing module, which can be used to determine whether to allow the UE2 to access the service cell according to the access control information of the service cell and the access parameters of the UE2 after the UE2 receives the unicast connection establishment response sent by the UE1.

[1270] In an optional implementation manner of the eighth access control device, a sending module may be used to send a unicast connection establishment request carrying access parameters of the UE2 to the UE1 before the UE2 receives the unicast connection establishment response sent by the UE1; wherein the access parameters of the UE2 are used to indicate that the UE1 determines whether to allow the UE2 to access the service cell based on the access control information of the service cell and the access parameters of the UE2; and the unicast connection establishment response includes: a determination result of whether the UE2 is allowed to access the service cell.

[1271] In an optional implementation of the eighth access control device, a sending module can be used to send a second side link RRC message to the UE1 after the UE2 receives the unicast connection establishment response sent by the UE1; wherein the second side link RRC message is used to request access control information; a receiving module can be used to receive a first side link RRC message sent by the UE1 carrying the access control information of the serving cell; and a processing module can be used to determine whether to allow the UE2 to access the serving cell based on the access control information of the serving cell and the access parameters of the UE2. In an embodiment of the present application, the second side link RRC message can include an access control information request identifier or PLMN information of the UE2.

[1272] In an optional implementation manner of the eighth access control device, a sending module may be used to send a third side link RRC message carrying access parameters of the UE2 to the UE1 after the UE2 receives a unicast connection establishment response sent by the UE1; wherein the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the service cell based on the access parameters of the UE2 and the access control information of the service cell; and a receiving module may be used to receive a fourth side link RRC message carrying the determination result sent by the UE1.

[1273] In an optional implementation manner of the eighth access control device, the access parameters of the UE2 include: PLMN information of the UE2; wherein the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the service cell based on the access control information corresponding to the PLMN information and the access parameters of the UE2.

[1274] In an optional implementation of the eighth access control device, an acquisition module can be used to obtain the access control information of the service cell corresponding to the PLMN information of the UE2; a processing module can be used to determine whether to allow the UE2 to access the service cell based on the acquired access control information and the access parameters of the UE2.

[1275] In an optional implementation of the eighth access control device, the sending module can be used to send the PLMN information of the UE2 to the UE1 before the UE2 receives the unicast connection establishment response sent by the UE1; the access control information of the service cell includes: the access control information of the service cell corresponding to the PLMN information of the UE2.

[1276] In an optional implementation manner of the eighth access control device, the sending module may be configured to send a unicast connection establishment request carrying the PLMN information of the UE2 to the UE1.

[1277] In an optional implementation manner of the eighth access control device, the second side link RRC message includes the PLMN information of the UE2; the access control information of the serving cell includes: the access control information of the serving cell corresponding to the PLMN information of the UE2.

[1278] In an optional implementation of the eighth access control device, the sending module can be used to send a unicast connection release to the UE1 when it is determined that the UE2 is prohibited from accessing the serving cell, or the processing module can be used to execute the step of reselecting the relay terminal. The unicast connection release is used to release the side link unicast connection between the UE1 and the UE2.

[1279] In an optional implementation manner of the eighth access control device, a release reason value in the unicast connection release is prohibited access to the cell.

[1280] In an optional implementation manner of the eighth access control device, the access parameters of the UE2 include: access type AC and access indication AI.

[1281] See Figure 6 The structure shown in the figure, the ninth access control device provided in the embodiment of the present application can be applied to the UE2 side, wherein:

[1282] A receiving module, which can be used to receive a unicast connection establishment response sent by UE1;

[1283] The sending module can be used to send a unicast connection release to the UE1 when it is determined that the UE2 is prohibited from accessing the serving cell of the UE1; wherein the unicast connection release is used to release the side link unicast connection between the UE2 and the UE1.

[1284] In an optional implementation of the ninth access control device, the unicast connection establishment response includes: access control information of the service cell; a processing module, which can be used to determine whether to allow the UE2 to access the service cell according to the access control information of the service cell and the access parameters of the UE2 after the UE2 receives the unicast connection establishment response sent by the UE1.

[1285] In an optional implementation manner of the ninth access control device, a sending module may be used to send a unicast connection establishment request carrying the access parameters of the UE2 to the UE1 before receiving the unicast connection establishment response sent by the UE1; wherein the access parameters of the UE2 are used to indicate that the UE1 determines whether to allow the UE2 to access the service cell based on the access control information of the service cell and the access parameters of the UE2; and the unicast connection establishment response includes: a determination result of whether the UE2 is allowed to access the service cell.

[1286] In an optional implementation of the ninth access control device, a sending module can be used to send a second side link RRC message to the UE1 after receiving a unicast connection establishment response sent by the UE1; wherein the second side link RRC message is used to request access control information; a receiving module can be used to receive a first side link RRC message sent by the UE1 carrying the access control information of the serving cell; and a processing module can be used to determine whether to allow the UE2 to access the serving cell based on the access control information of the serving cell and the access parameters of the UE2. In an embodiment of the present application, the second side link RRC message can include an access control information request identifier or PLMN information of the UE2.

[1287] In an optional implementation manner of the ninth access control device, a sending module may be used to send a third side link RRC message carrying access parameters of the UE2 to the UE1 after the UE2 receives a unicast connection establishment response sent by the UE1; wherein the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the service cell based on the access parameters of the UE2 and the access control information of the service cell; and a receiving module may be used to receive a fourth side link RRC message carrying the determination result sent by the UE1.

[1288] In an optional implementation manner of the ninth access control device, the access parameters of the UE2 include: the PLMN information of the UE2; wherein the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the service cell based on the access control information corresponding to the PLMN information and the access parameters of the UE2.

[1289] In an optional implementation of the ninth access control device, an acquisition module can be used to obtain the access control information of the service cell corresponding to the PLMN information of the UE2; a processing module can be used to determine whether to allow the UE2 to access the service cell based on the acquired access control information and the access parameters of the UE2.

[1290] In an optional implementation of the ninth access control device, the sending module can be used to send the PLMN information of the UE2 to the UE1 before the UE2 receives the unicast connection establishment response sent by the UE1; the access control information of the service cell includes: the access control information of the service cell corresponding to the PLMN information of the UE2.

[1291] In an optional implementation manner of the ninth access control device, the sending module may be configured to send a unicast connection establishment request carrying the PLMN information of the UE2 to the UE1.

[1292] In an optional implementation manner of the ninth access control device, the second side link RRC message includes the PLMN information of the UE2; the access control information of the serving cell includes: the access control information of the serving cell corresponding to the PLMN information of the UE2.

[1293] In an optional implementation manner of the ninth access control device, the sending module may be used to send a first RRC connection establishment request to the UE1 when it is determined that the UE2 is allowed to access the serving cell; wherein the first RRC connection establishment request is used to request establishment of an RRC connection between the UE2 and the RAN to which the cell belongs.

[1294] In an optional implementation manner of the ninth access control device, a release reason value in the unicast connection release message is access to a cell prohibited.

[1295] In an optional implementation manner of the ninth access control device, a sending module may be used to send a first RRC connection establishment request carrying access parameters of the UE2 to the UE1 after the UE2 receives a unicast connection establishment response sent by the UE1; wherein the first RRC connection establishment request is used to request establishment of an RRC connection between the UE2 and the RAN to which the cell belongs; the access parameters of the UE2 are used to instruct the UE1 to determine whether to allow the UE2 to access the service cell based on the access control information of the service cell and the access parameters of the UE2; and the receiving module may be used to receive a first RRC connection rejection sent by the UE1; the first RRC connection rejection is sent by the UE1 when it is determined that the UE2 is prohibited from accessing the service cell.

[1296] In an optional implementation manner of the ninth access control device, the connection rejection reason value in the first RRC connection rejection is prohibited access to the cell.

[1297] In an optional implementation manner of the ninth access control device, the processing module is further configured to execute a step of reselecting a relay terminal.

[1298] In an optional implementation manner of the ninth access control device, the access parameters of the UE2 include: an access type AC and an access indication AI.

[1299] See Figure 6 The structure shown in the figure, the tenth access control device provided in the embodiment of the present application can be applied to the UE1 side, wherein:

[1300] A receiving module, which can be used to receive a unicast connection establishment request sent by UE2;

[1301] The sending module can be used to send a unicast connection establishment response to the UE2 when it is determined that the UE2 is allowed to access the serving cell of the UE1; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[1302] In an optional implementation of the tenth access control device, the unicast connection establishment request includes the access parameters of the UE2; a processing module can be used to determine whether to allow the UE2 to access the service cell according to the access control information of the service cell and the access parameters of the UE2 after the UE1 receives the unicast connection establishment request sent by the UE2.

[1303] In an optional implementation of the tenth access control device, a receiving module may be used to receive the access parameters of the UE2 sent by the UE2 before the UE1 receives the unicast connection establishment request sent by the UE2; a processing module may be used to determine whether the UE2 is allowed to access the service cell based on the access control information of the service cell and the access parameters of the UE2.

[1304] In an optional implementation of the tenth access control device, the access parameters of the UE2 include the PLMN information of the UE2; an acquisition module can be used to obtain the access control information of the service cell corresponding to the PLMN information of the UE2; a processing module can be used to determine whether to allow the UE2 to access the service cell based on the acquired access control information and the access parameters of the UE2.

[1305] In an optional implementation manner of the tenth access control device, the receiving module may be configured to receive a second discovery request sent by the UE2 and carrying the access parameters of the UE2.

[1306] In an optional implementation manner of the tenth access control device, the receiving module may be used to receive a first RRC connection establishment request sent by the UE2; the sending module may be used to send the first RRC connection establishment request to the RAN; wherein the first RRC connection establishment request is used to request establishment of an RRC connection between the UE2 and the RAN to which the serving cell belongs.

[1307] In an optional implementation manner of the tenth access control device, the sending module may be configured to send a second RRC connection establishment request to the RAN when the UE1 is in a non-connected state before sending the first RRC connection establishment request to the UE1; wherein the second RRC connection establishment request is used to request establishment of an RRC connection between the UE1 and the RAN.

[1308] In an optional implementation manner of the tenth access control device, the connection establishment cause value in the second RRC connection establishment request is: relay, or the connection establishment cause value in the first RRC connection establishment request.

[1309] In an optional implementation manner of the tenth access control device, the sending module may be configured to send a second RRC connection establishment request to the RAN when the UE1 is in a non-connected state; wherein the second RRC connection establishment request is used to request establishment of an RRC connection between the UE1 and the RAN.

[1310] In an optional implementation manner of the tenth access control device, the connection establishment cause value in the second RRC connection establishment request is: relay, or the cause value for establishing the RRC connection between the UE2 and the RAN carried in the unicast connection establishment request.

[1311] In an optional implementation manner of the tenth access control device, the sending module may be configured to send a unicast connection rejection to the UE2 when it is determined that the UE2 is prohibited from accessing the serving cell.

[1312] In an optional implementation manner of the tenth access control device, the connection rejection reason value in the unicast connection rejection is prohibited access to the cell.

[1313] See Figure 6 The structure shown in the figure, the eleventh access control device provided in the embodiment of the present application can be applied to the UE1 side, wherein:

[1314] A receiving module, configured to receive a first RRC connection establishment request sent by UE2; the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and a RAN to which a serving cell of the UE1 belongs;

[1315] The sending module is configured to enable the UE1 to send the first RRC connection establishment request to the RAN when it is determined that the UE2 is allowed to access the serving cell.

[1316] In an optional implementation manner of the eleventh access control device, the first RRC connection establishment request includes the access parameters of the UE2, or the receiving module can be used to receive the first RRC connection establishment request sent by the UE2 and the access parameters of the UE2;

[1317] The processing module is configured to determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameters of the UE2 after the UE1 receives the first RRC connection establishment request sent by the UE2.

[1318] In an optional implementation of the eleventh access control device, a receiving module may be used to receive access parameters of the UE2 sent by the UE2 before the UE1 receives the first RRC connection establishment request sent by the UE2; a processing module may be used to determine whether the UE2 is allowed to access the service cell based on the access control information of the service cell and the access parameters of the UE2.

[1319] In an optional implementation of the eleventh access control device, the access parameters of the UE2 include the PLMN information of the UE2; the acquisition module can be used to obtain the access control information of the service cell corresponding to the PLMN information of the UE2; the processing module can be used to determine whether to allow the UE2 to access the service cell based on the acquired access control information and the access parameters of the UE2.

[1320] In an optional implementation manner of the eleventh access control device, the receiving module may be configured to receive a third side link RRC message sent by the UE2 and carrying the access parameters of the UE2.

[1321] In an optional implementation of the eleventh access control device, the receiving module can be used to receive a unicast connection establishment request sent by the UE2 before the UE1 receives the first RRC connection establishment request sent by the UE2; the sending module can be used to send a unicast connection establishment response to the UE2; wherein the unicast connection establishment request is used to request to establish a side link unicast connection between the UE1 and the UE2.

[1322] In an optional implementation manner of the eleventh access control device, the sending module may be used to send a second RRC connection establishment request to the RAN to which the serving cell belongs, if the UE1 is in a non-connected state, before the UE1 sends the first RRC connection establishment request to the RAN; wherein the second RRC connection establishment request is used to request establishment of an RRC connection between the UE1 and the RAN; and the receiving module may be used to receive the second RRC connection establishment sent by the RAN.

[1323] In an optional implementation manner of the eleventh access control device, the connection establishment cause value in the second RRC connection establishment request is: relay, or the connection establishment cause value in the first RRC connection establishment request.

[1324] In an optional implementation manner of the eleventh access control device, the sending module may be configured to send a first RRC connection rejection to the UE2 when it is determined that the UE2 ...

Claims

1. A communication method, characterized in that: include: Sending access control information of a serving cell of the first terminal device UE1 to the second terminal device UE2, where the access control information of the serving cell is used to determine whether to allow the UE2 to access the serving cell; receiving a first RRC connection establishment request sent by the UE2, where the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and a wireless network side RAN to which the serving cell belongs; When the UE1 is in an idle state or an activated state, a second RRC connection establishment request is sent to the RAN; wherein the second RRC connection establishment request is used to request to establish an RRC connection between the UE1 and the RAN.

2. The method according to claim 1, characterized in that: When the UE1 is in an idle state, the second RRC connection establishment request is an RRC connection establishment request RRCSetupRequest.

3. The method according to claim 1, characterized in that When the UE1 is in an activated state, the second RRC connection establishment request is an RRC connection resumption RRCResumeRequest.

4. The method according to any one of claims 1 to 3, characterized in that: The second RRC connection establishment request includes a connection establishment cause value, and the connection establishment cause value is the connection establishment cause value in the first RRC connection establishment request.

5. The method according to any one of claims 1 to 4, characterized in that: Before sending the access control information of the serving cell of the UE1 to the UE2, the method further includes: receiving the PLMN information of the UE2 sent by the UE2; Sending the access control information of the serving cell of the UE1 to the UE2 includes: sending the access control information of the serving cell corresponding to the PLMN information of the UE2 to the UE2.

6. The method according to claim 5, characterized in that The receiving the PLMN information of the UE2 sent by the UE2 includes: Receive a second discovery request sent by the UE2 and carrying the PLMN information of the UE2.

7. The method according to any one of claims 1 to 6, characterized in that: The access control information is used to determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and the access parameters of the UE2.

8. The method according to claim 7, characterized in that The access parameters of UE2 include: access type AC and access indication AI.

9. A communication method, characterized in that: include: Receive access control information of a serving cell of a first terminal device UE1, where the access control information of the serving cell is used to determine whether to allow a second terminal device UE2 to access the serving cell; A first RRC connection establishment request is sent to the UE1, where the first RRC connection establishment request is used to request to establish an RRC connection between the UE2 and the wireless network side RAN to which the serving cell belongs.

10. The method according to claim 9, characterized in that The method further comprises: Determine whether to allow the UE2 to access the serving cell according to the access control information of the serving cell and / or the access parameter of the UE2.

11. The method according to claim 10, characterized in that The access parameters of UE2 include: access type AC and access indication AI.

12. The method according to any one of claims 9 to 11, characterized in that: Before receiving the access control information of the serving cell of the UE1, the method further includes: Sending PLMN information of the UE2 to the UE1; Receiving the access control information of the serving cell of the UE1 includes: receiving the access control information of the serving cell corresponding to the PLMN information of the UE2.

13. The method according to claim 12, characterized in that The sending the PLMN information of the UE2 to the UE1 includes: A second discovery request carrying the PLMN information of the UE2 is sent to the UE1.

14. The method according to any one of claims 9 to 13, characterized in that: The method further comprises: Receive the first RRC connection establishment response sent by the UE1.

15. A communication device, characterized in that: The method comprises a module for executing the method according to any one of claims 1 to 8 or the method according to any one of claims 9 to 14.

16. A communication device, characterized in that: comprising a processor; when the communication device is running, the processor executes computer instructions to execute the method described in any one of claims 1 to 8, or executes the method described in any one of claims 9 to 14.

17. A communication device, characterized in that: The invention comprises a processor and an interface circuit, wherein the processor is used to communicate with other devices through the interface circuit and execute the method described in any one of claims 1 to 8, or execute the method described in any one of claims 9 to 14.

18. A computer program product, characterized in that The method comprises instructions which, when executed, cause the method as claimed in any one of claims 1 to 14 to be performed.

19. A computer-readable storage medium, characterized in that: The storage medium stores a computer program or instruction, and when the computer program or instruction is executed, the method according to any one of claims 1 to 14 is performed.

20. A communication system, characterized in that: Comprising a terminal device for executing the method described in any one of claims 1 to 8, and a terminal device for executing the method described in any one of claims 9 to 14.

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