Method and device for random access

Abstract

The present invention discloses a method and apparatus for random access. The method comprises the steps of: in a random access process, a base station to which a satellite cell belongs transmits a random access-related message through a ground cell accessed by a UE and indicates a cell type corresponding to the random access-related message; the UE receives the random access-related message transmitted by the ground cell; and determine a cell type corresponding to the random access-related message, wherein the cell type is a ground cell or a satellite cell. The present invention provides a method for random access by a satellite cell with the assistance of a ground cell. According to the method, the random access delay of a satellite communication system can be reduced, and the delay overhead can be reduced.

Description

Technology Field

[0001] [Cross-citation of related applications]

[0002] The present application claims priority to the Chinese patent application No. 202010623897.9, filed with the Chinese Intellectual Property Office on June 30, 2020, with the invention title "Method and apparatus for random access," the entire contents of said Chinese patent application incorporated by reference into the application and made part of the present application.

[0003] The present invention belongs to the field of communication technology, and more specifically, relates to a method and apparatus for random access. Background Technology

[0004] In the future, mobile communication systems may utilize a space-ground integrated networking mode, that is, a complete network consisting of satellite communication systems and terrestrial communication systems. Compared to terrestrial communication systems, satellite communication systems are typically characterized by very long transmission delays.

[0005] The 5G random access process is divided into two types: a four-stage random access including Msg1 and a two-stage random access including MsgA. The two types of random access support contention-based random access (CBRA) and contention-free random access (CFRA).

[0006] In CFRA mode, different User Equipment (UEs) may cause conflicts by using the same random access resource. In CFRA mode, the network assigns a specific random access resource to a UE and can identify the UE based on the specific random access resource used by the UE. When initiating random access, the UE selects a random access type based on the network configuration.

[0007] If the CFRA resource is not configured, the UE selects between 2-stage random access and 4-stage random access in CBRA mode based on the threshold of the Reference Signal Receiving Power (RSRP).

[0008] If the CFRA resource is configured for 4-level random access, the UE selects 4-level random access.

[0009] If the CFRA resource is configured for two-stage random access, the UE selects two-stage random access.

[0010] Currently, the random access process of satellite communication systems is divided into two types: four-stage random access including Msg1 and two-stage random access including MsgA. However, because satellite communication is located far from the ground, very long random access delays occur when a UE performs random access through a satellite cell. Therefore, it is necessary to reduce the random access delay of satellite cells during space-ground integrated networking. The problem to be solved

[0011] The present invention provides a method and apparatus for random access to resolve large delays in random access of a satellite communication system. means of solving the problem

[0012] In a first aspect, the present invention provides a method for random access performed by user equipment (UE), said method, said method

[0013] A step of receiving a random access-related message transmitted by a ground cell; and

[0014] The method includes a step of determining a cell type corresponding to the above random access-related message, wherein the cell type is a ground cell or a satellite cell.

[0015] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0016] Optionally, the step of determining a cell type corresponding to the above random access-related message is,

[0017] Determining a cell type corresponding to the random access-related message through display information added to the random access-related message; or

[0018] It includes the step of determining a cell type corresponding to the random access-related message using the Radio Network Temporary Identity (RNTI) of the scrambled random access-related message.

[0019] Optionally, the display information added to the above random access-related message is,

[0020] A Media Access Control (MAC) subheader of a Random Access Response (RAR) Media Access Control (MAC) Protocol Data Unit (PDU) corresponding to the second message (Msg2) of the 4-stage contention-based random access, or indication information added to the payload portion of the RAR MAC PDU, and / or indication information added to the fourth message Msg 4 of the 4-stage contention-based random access; or

[0021] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0022] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0023] Optionally, the above display information is,

[0024] Cell Group ID corresponding to random access-related messages;

[0025] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0026] The cell and / or frequency point ID corresponding to the random access-related message;

[0027] Cell type ID corresponding to the random access-related message;

[0028] RNTI used when transmitting random access-related messages; and

[0029] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0030] Optionally, the above method also,

[0031] The method includes the step of receiving a first contention resolution timer used for contention resolution of satellite cell contention-based random access configured by a network device and a second contention resolution timer used for contention resolution of ground cell contention-based random access, wherein the time length of the first contention resolution timer is the same as or different from the time length of the second contention resolution timer, and / or, the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0032] Optionally, the above method also,

[0033] The method further includes the step of transmitting a third message (Msg3) of four-stage contention-based random access to a satellite cell, wherein the Msg3 includes a cell radio network temporary ID (Cell-RNTI, C-RNTI) used by the UE in the satellite cell.

[0034] Optionally, the above method also,

[0035] The above random access-related message further includes the step of determining that the contention resolution is successful if it includes at least one of uplink and / or downlink resources allocated to the UE by the base station to which the satellite cell belongs and used by the UE in the satellite cell, and C-RNTI used by the UE in the satellite cell.

[0036] In a second aspect, the method for random access provided by the present invention is applied to a base station to which a satellite cell belongs, and

[0037] A step of determining the ground cell accessed by the UE; and

[0038] It includes the step of transmitting a random access-related message to the UE through the ground cell and indicating that the cell type corresponding to the random access-related message is a satellite cell.

[0039] Optionally, when the ground cell and the satellite cell belong to different base stations, the step of transmitting a random access-related message to the UE through the ground cell and indicating that the cell type corresponding to the random access-related message is a satellite cell is

[0040] It further includes the step of exchanging some or all of the random access-related messages with the ground cell through an interface between base stations.

[0041] Optionally, the step of exchanging some or all of the random access-related messages with the ground cell through a base station interface is

[0042] The base station to which the satellite cell belongs generates a complete random access related message and transmits the generated random access related message to the ground cell through an interface between base stations; or

[0043] The base station to which the satellite cell belongs includes the step of transmitting part or all of the random access-related message to the ground cell so that the base station to which the ground cell belongs generates the complete random access-related message.

[0044] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0045] Optionally, the step of indicating that the cell type corresponding to the random access-related message is a satellite cell is,

[0046] Indicating that the cell type corresponding to the random access-related message is a satellite cell through the indication information added to the random access-related message; or

[0047] It includes the step of using the RNTI of the scrambled random access related message to indicate that the cell type corresponding to the random access related message is a satellite cell.

[0048] Optionally, the display information added to the above random access-related message is,

[0049] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0050] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0051] Displays information added to the first message (Msg0) of the 4th stage contention-free random access, and / or information added to the MAC subheader of the RAR MAC PDU or the payload portion of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access.

[0052] Optionally, the above display information is,

[0053] Cell Group ID corresponding to random access-related messages;

[0054] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0055] The cell and / or frequency point ID corresponding to the random access-related message;

[0056] Cell type ID corresponding to the random access-related message;

[0057] RNTI used when transmitting random access-related messages; and

[0058] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0059] Optionally, the above method also,

[0060] For the above UE, a first contention resolution timer used for contention resolution of satellite cell contention-based random access is configured, and the length of the first contention resolution timer is the same as or different from the length of a second contention resolution timer used for contention resolution of ground cell contention-based random access;

[0061] and / or

[0062] For the above UE, the start time of the first contention resolution timer is configured, and the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0063] Optionally, the above method also,

[0064] Receives a third message (Msg3) of four-stage contention-based random access transmitted by the UE, said Msg3 includes a C-RNTI used by the UE in the satellite cell.

[0065] In a third embodiment, the method for random access provided by the present invention is applied to a base station to which a ground cell belongs, and the method is,

[0066] A step of receiving a random access-related message for a user device (UE) transmitted by a satellite cell; and

[0067] It includes the step of transmitting the above random access-related message to the UE and indicating that the cell type corresponding to the above random access-related message is a satellite cell.

[0068] Optionally, if the ground cell and the satellite cell belong to different base stations, the step of receiving a random access-related message corresponding to a UE transmitted by the satellite cell is:

[0069] It includes the step of exchanging some or all of the random access-related messages with the satellite cell through an interface between base stations.

[0070] Optionally, the step of exchanging some or all of the random access-related messages with the satellite cell through a base station interface is,

[0071] Receive a complete random access related message from the base station to which the satellite cell belongs via a base station interface; or

[0072] It includes the step of receiving all of the random access-related messages transmitted by the satellite cell through the interface between base stations, and receiving a complete random access-related message based on all of the said random access-related messages.

[0073] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0074] Optionally, the step of indicating that the cell type corresponding to the random access-related message is a satellite cell is,

[0075] Indicating that the cell type corresponding to the random access-related message is a satellite cell through the indication information added to the random access-related message; or

[0076] It includes the step of using the RNTI of the scrambled random access related message to indicate that the cell type corresponding to the random access related message is a satellite cell.

[0077] Optionally, the display information added to the above random access-related message is,

[0078] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0079] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0080] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0081] Optionally, the above display information is,

[0082] Cell Group ID corresponding to random access-related messages;

[0083] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0084] The cell and / or frequency point ID corresponding to the random access-related message;

[0085] Cell type ID corresponding to the random access-related message;

[0086] RNTI used when transmitting random access-related messages; and

[0087] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0088] Optionally, in the above method, also,

[0089] A second contention resolution timer is configured for the above UE for contention resolution of ground cell contention-based random access, and the length of the second contention resolution timer is different from the length of the first contention resolution timer used for contention resolution of satellite cell contention-based random access;

[0090] and / or

[0091] For the above UE, the start time of the second contention resolution timer is configured, and the start time of the second contention resolution timer is different from the start time of the first contention resolution timer.

[0092] Optionally, if the random access-related message includes a fourth message (Msg4) in a four-stage contention-based random access process, the Msg4 is,

[0093] Uplink and / or downlink resources allocated to the UE by the base station to which the satellite cell belongs and used by the UE in the satellite cell; and

[0094] It includes at least one of the C-RNTIs used by the UE in the above satellite cell.

[0095] In a fourth embodiment, a random access device provided by the present invention comprises a memory and a processor, and

[0096] The above memory is configured to store computer programs, and

[0097] The above processor reads the computer program from the above memory, and

[0098] Receive a random access-related message transmitted by a ground cell;

[0099] Determine the cell type corresponding to the above random access related message, and the cell type is a ground cell or a satellite cell.

[0100] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0101] Optionally, the processor determining the cell type corresponding to the random access-related message specifically includes:

[0102] Determining a cell type corresponding to the random access-related message through display information added to the random access-related message; or

[0103] The RNTI of the scrambled random access related message is used to determine the cell type corresponding to the random access related message.

[0104] Optionally, the display information added to the above random access-related message is,

[0105] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0106] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0107] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0108] Optionally, the above display information is,

[0109] Cell Group ID corresponding to random access-related messages;

[0110] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0111] The cell and / or frequency point ID corresponding to the random access-related message;

[0112] Cell type ID corresponding to the random access-related message;

[0113] RNTI used when transmitting random access-related messages; and

[0114] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0115] Optionally, the processor also,

[0116] A network device receives a first contention resolution timer used for contention resolution of satellite cell contention-based random access and a second contention resolution timer used for contention resolution of ground cell contention-based random access, wherein the time length of the first contention resolution timer is the same as or different from the time length of the second contention resolution timer, and / or, the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0117] Optionally, the processor also,

[0118] A third message (Msg3) of four-stage contention-based random access is transmitted to the satellite cell, and the Msg3 includes a C-RNTI used by the UE in the satellite cell.

[0119] Optionally, the processor also,

[0120] The above random access related message

[0121] Uplink and / or downlink resources allocated to the UE by the base station to which the satellite cell belongs and used by the UE in the satellite cell; and

[0122] It is determined that the contention resolution is successful if the satellite cell includes one of the C-RNTIs used by the UE.

[0123] In a fifth embodiment, the random access device provided by the present invention is applied to a satellite cell and includes a memory and a processor, and

[0124] The above memory is configured to store computer programs, and

[0125] The above processor reads the computer program from the above memory, and

[0126] Determine the ground cell accessed by the UE;

[0127] A random access-related message is transmitted to the UE through the above ground cell, and the cell type corresponding to the random access-related message is indicated as a satellite cell.

[0128] Optionally, when the ground cell and the satellite cell belong to different base stations, the processor transmits a random access-related message to the UE through the ground cell and indicates that the cell type corresponding to the random access-related message is a satellite cell, specifically,

[0129] Some or all of the random access-related messages are exchanged with the ground cell through the interface between base stations.

[0130] Optionally, exchanging some or all of the random access-related messages with the ground cell through the interface between the processor base stations is specifically,

[0131] Generate a complete random access-related message and transmit the generated random access-related message to the ground cell through a base station interface; or

[0132] Part or all of the random access-related message is transmitted to a ground cell so that the base station to which the ground cell belongs generates a complete random access-related message.

[0133] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0134] Optionally, the processor indicates that the cell type corresponding to the random access-related message is a satellite cell, specifically,

[0135] Indicating that the cell type corresponding to the random access-related message is a satellite cell through the indication information added to the random access-related message; or

[0136] Using the RNTI of the scrambled random access related message, the cell type corresponding to the random access related message is indicated as a satellite cell.

[0137] Optionally, the display information added to the above random access-related message is,

[0138] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0139] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0140] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0141] Optionally, the above display information is,

[0142] Cell Group ID corresponding to random access-related messages;

[0143] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0144] The cell and / or frequency point ID corresponding to the random access-related message;

[0145] Cell type ID corresponding to the random access-related message;

[0146] RNTI used when transmitting random access-related messages; and

[0147] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0148] Optionally, the processor also,

[0149] For the above UE, a first contention resolution timer used for contention resolution of satellite cell contention-based random access is configured, and the length of the first contention resolution timer is the same as or different from the length of a second contention resolution timer used for contention resolution of ground cell contention-based random access;

[0150] and / or

[0151] For the above UE, the start time of the first contention resolution timer is configured, and the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0152] Optionally, the processor also,

[0153] Receives a third message (Msg3) of four-stage contention-based random access transmitted by the UE, said Msg3 includes a C-RNTI used by the UE in the satellite cell.

[0154] In a sixth aspect, the random access device provided by the present invention is applied to a ground cell and includes a memory and a processor, and

[0155] The above memory is configured to store computer programs, and

[0156] The above processor reads the computer program from the above memory, and

[0157] Receive a random access related message for a user device (UE) transmitted by a satellite cell;

[0158] The above random access-related message is transmitted to the UE, and the cell type corresponding to the above random access-related message is indicated as a satellite cell.

[0159] Optionally, if the ground cell and the satellite cell belong to different base stations, the processor receiving a random access-related message corresponding to a UE transmitted by the satellite cell is specifically,

[0160] Through an interface between base stations, the satellite cell exchanges some or all of the random access-related messages with the base station to which it belongs.

[0161] Optionally, the processor exchanging some or all of the random access-related messages with the satellite cell through a base station interface is specifically,

[0162] Receive a complete random access related message from the base station to which the satellite cell belongs via a base station interface; or

[0163] Through the interface between base stations, the satellite cell receives all of the random access-related messages from the base station to which it belongs, and receives a complete random access-related message based on all of the said random access-related messages.

[0164] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0165] Optionally, the processor indicates that the cell type corresponding to the random access-related message is a satellite cell, specifically,

[0166] Indicating that the cell type corresponding to the random access-related message is a satellite cell through the indication information added to the random access-related message; or

[0167] Using the RNTI of the scrambled random access related message, the cell type corresponding to the random access related message is indicated as a satellite cell.

[0168] Optionally, the display information added to the above random access-related message is,

[0169] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0170] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0171] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0172] Optionally, the above display information is,

[0173] Cell Group ID corresponding to random access-related messages;

[0174] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0175] The cell and / or frequency point ID corresponding to the random access-related message;

[0176] Cell type ID corresponding to the random access-related message;

[0177] RNTI used when transmitting random access-related messages; and

[0178] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0179] Optionally, the processor also,

[0180] A second contention resolution timer is configured for the above UE for contention resolution of ground cell contention-based random access, and the length of the second contention resolution timer is different from the length of the first contention resolution timer used for contention resolution of satellite cell contention-based random access;

[0181] and / or

[0182] For the above UE, the start time of the second contention resolution timer is configured, and the start time of the second contention resolution timer is different from the start time of the first contention resolution timer.

[0183] Optionally, if the random access-related message includes a message (Msg4) in a CBRA-based 4-step random access process, the message (Msg4) is,

[0184] Uplink and / or downlink resources allocated to the UE by the base station to which the satellite cell belongs and used by the UE in the satellite cell; and

[0185] It includes at least one of the C-RNTIs used by the UE in the above satellite cell.

[0186] In a seventh aspect, the device for random access provided by the present invention is,

[0187] A message receiving unit configured to receive random access-related messages transmitted by a ground cell; and

[0188] It includes a cell type determination unit configured to determine a cell type corresponding to the above random access-related message, and

[0189] The above cell type is a ground cell or a satellite cell.

[0190] The above random access related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0191] Optionally, the cell type determination unit determines the cell type corresponding to the random access-related message specifically,

[0192] Determining a cell type corresponding to the random access-related message through display information added to the random access-related message; or

[0193] The RNTI of the scrambled random access related message is used to determine the cell type corresponding to the random access related message.

[0194] Optionally, the display information added to the above random access-related message is,

[0195] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0196] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0197] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0198] Optionally, the above display information is,

[0199] Cell Group ID corresponding to random access-related messages;

[0200] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0201] The cell and / or frequency point ID corresponding to the random access-related message;

[0202] Cell type ID corresponding to the random access-related message;

[0203] RNTI used when transmitting random access-related messages; and

[0204] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0205] Optionally, further comprising a timer configuration receiving unit configured to receive a first contention resolution timer used for contention resolution of satellite cell contention-based random access configured by a network device and a second contention resolution timer used for contention resolution of ground cell contention-based random access, and

[0206] The time length of the first competition resolution timer is the same as or different from the time length of the second competition resolution timer, and / or, the start time of the first competition resolution timer is different from the start time of the second competition resolution timer.

[0207] Optionally, it further includes a message transmission unit configured to transmit a third message (Msg3) of four-stage contention-based random access to a satellite cell, said Msg3 includes a C-RNTI used by the UE in said satellite cell.

[0208] Optionally, the contention resolution unit further comprises a contention resolution unit configured to determine that the contention resolution is successful if the random access-related message is assigned to the UE by the base station to which the satellite cell belongs and includes one of the uplink and / or downlink resources used by the UE in the satellite cell and the C-RNTI used by the UE in the satellite cell.

[0209] In the eighth aspect, the device for random access provided by the present invention is applied to a satellite cell, and

[0210] A ground cell determination unit configured to determine ground cells accessed by the UE; and

[0211] It includes a message transmission unit configured to transmit a random access-related message to the UE through the ground cell and to indicate that the cell type corresponding to the random access-related message is a satellite cell.

[0212] Specifically, when the ground cell and the satellite cell belong to different base stations, the message transmission unit transmits a random access-related message to the UE through the ground cell and indicates that the cell type corresponding to the random access-related message is a satellite cell,

[0213] Some or all of the random access-related messages are exchanged with the ground cell through the interface between base stations.

[0214] Optionally, the message transmission unit exchanges part or all of the random access-related messages with the ground cell through a base station interface, specifically,

[0215] The base station to which the satellite cell belongs generates a complete random access related message and transmits the generated random access related message to the ground cell through an interface between base stations; or

[0216] The base station to which the satellite cell belongs transmits part or all of the random access-related message to the ground cell, causing the base station to which the ground cell belongs to generate the complete random access-related message.

[0217] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0218] Optionally, the message transmission unit indicates that the cell type corresponding to the random access-related message is a satellite cell, specifically,

[0219] Indicating that the cell type corresponding to the random access-related message is a satellite cell through the indication information added to the random access-related message; or

[0220] Using the RNTI of the scrambled random access related message, the cell type corresponding to the random access related message is indicated as a satellite cell.

[0221] Optionally, the display information added to the above random access-related message is

[0222] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0223] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0224] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0225] Optionally, the above display information is,

[0226] Cell Group ID corresponding to random access-related messages;

[0227] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0228] The cell and / or frequency point ID corresponding to the random access-related message;

[0229] Cell type ID corresponding to the random access-related message;

[0230] RNTI used when transmitting random access-related messages; and

[0231] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0232] Optionally, for the UE, further comprises a timer configuration unit configured to configure a first contention resolution timer used for contention resolution of satellite cell contention-based random access, wherein the length of the first contention resolution timer is equal to or different from the length of a second contention resolution timer used for contention resolution of ground cell contention-based random access; and / or, for the UE, configure a start time of the first contention resolution timer, wherein the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0233] Optionally, the message receiving unit also receives a third message (Msg3) of four-stage contention-based random access transmitted by the UE, said Msg3 includes a C-RNTI used by the UE in the satellite cell.

[0234] In the ninth aspect, the device for random access provided by the present invention is applied to a ground cell, and

[0235] A message receiving unit configured to receive random access-related messages for user equipment (UE) transmitted by a satellite cell; and

[0236] It includes a message transmission unit configured to transmit the above random access-related message to the UE and to indicate that the cell type corresponding to the above random access-related message is a satellite cell.

[0237] In the case where the ground cell and the satellite cell belong to different base stations, the message receiving unit receiving a random access-related message corresponding to a UE transmitted by the satellite cell is specifically:

[0238] Some or all of the random access-related messages are exchanged with the satellite cell through the interface between base stations.

[0239] Optionally, the message receiving unit exchanges part or all of the random access-related messages with the satellite cell through a base station interface, specifically,

[0240] Receive a complete random access related message from the base station to which the satellite cell belongs via a base station interface; or

[0241] Receives all of the random access-related messages transmitted by the satellite cell through the interface between base stations, and receives a complete random access-related message based on all of the said random access-related messages.

[0242] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0243] Optionally, the message transmission unit indicates that the cell type corresponding to the random access-related message is a satellite cell, specifically,

[0244] Indicating that the cell type corresponding to the random access-related message is a satellite cell through the indication information added to the random access-related message; or

[0245] Using the RNTI of the scrambled random access related message, the cell type corresponding to the random access related message is indicated as a satellite cell.

[0246] Optionally, the display information added to the above random access-related message is,

[0247] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0248] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0249] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0250] Optionally, the above display information is,

[0251] Cell Group ID corresponding to random access-related messages;

[0252] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0253] The cell and / or frequency point ID corresponding to the random access-related message;

[0254] Cell type ID corresponding to the random access-related message;

[0255] RNTI used when transmitting random access-related messages; and

[0256] Includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0257] Optionally, the system further comprises a timer configuration unit configured to configure a second contention resolution timer used for contention resolution of ground cell contention-based random access for the UE, wherein the length of the second contention resolution timer is different from the length of the first contention resolution timer used for contention resolution of satellite cell contention-based random access; and / or, the system configures a start time of the second contention resolution timer for the UE, wherein the start time of the second contention resolution timer is different from the start time of the first contention resolution timer.

[0258] Optionally, if the random access-related message includes a fourth message (Msg4) in a four-stage contention-based random access process, the Msg4 is,

[0259] Uplink and / or downlink resources allocated to the UE by the base station to which the satellite cell belongs and used by the UE in the satellite cell; and

[0260] C-RNTI used by the UE in the above satellite cell

[0261] Includes at least one of them.

[0262] In a tenth embodiment, the present invention provides a computer program medium for storing a computer program, wherein, when the computer program is executed by a processor, it implements the steps of a method for random access provided in the first embodiment described above, or implements the steps of a method for random access provided in the second embodiment described above or the third embodiment described above.

[0263] In the first aspect of the embodiment of the present invention, a chip is provided and coupled to a memory within a device so that, in order to implement all aspects described above in the embodiments of the present invention, the chip calls program instructions stored in memory during execution.

[0264] In an embodiment of the present invention, a 12th aspect provides a computer program product. When executed on an electronic device, the computer program product enables the electronic device to implement all the aspects described above in the embodiments of the present invention and to implement all possible methods regarding all aspects. Effects of the invention

[0265] The method and device for random access provided by an embodiment of the present invention have the following beneficial effects.

[0266] The present invention provides a method for random access by a satellite cell with the assistance of a ground cell. According to this method, the random access delay of a satellite communication system can be reduced, and the overhead of the delay can be reduced. Brief explanation of the drawing

[0267] Figure 1 is a schematic diagram of a conventional CBRA-based 4-step random access process. Figure 2 is a schematic diagram of a conventional CBRA-based two-stage random access process. Figure 3 is a schematic diagram of a conventional CFRA-based 4-step random access process. Figure 4 is a schematic diagram of a conventional CFRA-based two-stage random access process. FIG. 5 is a schematic diagram of a random access system provided by an embodiment of the present invention. FIG. 6 is a schematic diagram of a CBRA-based four-stage random access process provided by an embodiment of the present invention. FIG. 7 is a schematic diagram of a CBRA-based two-stage random access process provided by an embodiment of the present invention. FIG. 8 is a schematic diagram of a CFRA-based four-step random access process provided by an embodiment of the present invention. FIG. 9 is a flowchart of a method for random access applied to a UE according to an embodiment of the present invention. FIG. 10 is a flowchart of a method for random access applied to a base station to which a satellite cell belongs according to an embodiment of the present invention. FIG. 11 is a flowchart of a method for random access applied to a base station to which a ground cell belongs according to an embodiment of the present invention. FIG. 12 is a configuration diagram of a device for random access applied to the UE side according to an embodiment of the present invention. FIG. 13 is a configuration diagram of a device for random access applied to a satellite cell according to an embodiment of the present invention. FIG. 14 is a configuration diagram of a device for random access applied to a ground cell according to an embodiment of the present invention. FIG. 15 is a configuration diagram of a device for random access applied to a UE, according to another embodiment of the present invention. FIG. 16 is a configuration diagram of a device for random access applied to a satellite cell, according to an embodiment of the present invention. FIG. 17 is a configuration diagram of a device for random access applied to a ground cell, according to an embodiment of the present invention. FIG. 18 is a diagram showing whether the cell type corresponding to the successRAR is a satellite cell or a ground cell by utilizing the existing reserved bit field (R) in the subheader corresponding to the successRAR according to an embodiment of the present invention. Specific details for implementing the invention

[0268] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention. It should be noted that the described embodiments are merely partial embodiments rather than the whole of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without inventive effort are included within the scope of protection of the present invention.

[0269] The 5G random access process is divided into two types: a four-stage random access including Msg1 and a two-stage random access including MsgA. These two types of random access support CBRA and CFRA.

[0270] As illustrated in Fig. 1, the CBRA-based four-stage random access process mainly includes the following.

[0271] Step 1: The UE transmits a first message (Msg1) to the network-side device gNB (5G base station), and

[0272] The UE selects a random access preamble and a Physical Random Access Channel (PRACH) resource, and transmits the selected preamble to the base station through the PRACH resource.

[0273] Step 2: After receiving message (Msg1), gNB sends a second random access message (Msg2) (also called a random access response message) to the UE.

[0274] A complete Msg2 is a single MAC PDU, and said MAC PDU contains one or more MAC subPDUs. Each MAC subPDU has a corresponding MAC subheader and payload portion. If the MAC subPDU is a MAC RAR subPDU, the corresponding MAC subheader contains a Random Access Preamble Identity (RAPID). The payload portion of the MAC RAR subPDU contains a Time Advance Command (TAC), an Uplink Grant (UL Grant) for Msg3, and a Temporary C-RNTI allocated by the network side. The Physical Downlink Control Channel (PDCCH) carrying the scheduling information for Msg2 is scrambled into a Random Access Radio Network Temporary ID (RA-RNTI), and the RA-RNTI uniquely corresponds to the time frequency resource for transmitting Msg1 within the window length during which the UE receives Msg2. When receiving Msg2, the UE determines that Msg2 corresponds to Msg1 transmitted by the UE based on RA-RNTI and preamble ID (Identity, ID).

[0275] Step 3: The UE sends a third message (Msg3) to the gNB for contention random access.

[0276] The UE transmits an uplink transmission via the UL grant specified in Msg2. The content included in Msg3 for the uplink transmission differs depending on the reason for the random access. For example, in the case of initial access, a request to establish a connection from Radio Resource Control (RRC) is transmitted via Msg3.

[0277] Step 4: After receiving the third message (Msg3), the gNB sends the fourth message (Msg4) of contention resolution to the UE.

[0278] The UE can determine the success of random access based on Msg4. For the UE performing the initial access, the C-RNTI is automatically converted from the cell to the UE's unique C-RNTI after contention resolution is successful.

[0279] As illustrated in Fig. 2, a CBRA-based two-stage random access process mainly comprises the following:

[0280] Step A: The UE transmits a first message (MsgA) to the gNB. The message transmits a random access preamble and a Physical Uplink Shared Channel (PUSCH).

[0281] MsgA corresponds to (Msg1+Msg3) of 4-step random access (RA) and includes a random access code part and a data part that can be decoded independently.

[0282] The random access code portion transmits the preamble code (i.e., the random access code preamble of Msg1 in the 4-stage random access RA). The data portion is similar to Msg3 in the 4-stage random access RA and includes UEI D (e.g., C-RNTI), RRC messages (e.g., requests to establish an RRC connection), buffer status reports (Buffer Status Report, BSR or Data Volume, DV), power headroom reports (Power Headroom Report, PHR), and uplink data.

[0283] Step B: After gNB receives PUSCH scrambled with a random access preamble and RA-RNTI, it determines the RA-RNTI based on the resource location where the random access preamble was received, correctly scrambles PUSCH through the RA-RNTI, and then sends a second message (MsgB) of contention resolution to the UE.

[0284] As illustrated in FIG. 3, the CFRA-based four-step random access process mainly comprises the following: Step 0: The gNB transmits a first message (Msg0) containing a random access preamble to the UE.

[0285] gNB allocates a dedicated preamble for contentious random access and a PRACH resource for random access to the UE via Msg0.

[0286] Step 1: After receiving Msg0, the UE sends a second message (Msg1) to gNB.

[0287] The UE includes a dedicated preamble assigned to the gNB from the PRACH resource assigned according to the indication of Msg0.

[0288] Step 2: After receiving the above Msg1, the gNB sends a third message (Msg2) to the UE as a random access response.

[0289] Upon receiving Msg1, the gNB calculates the Uplink Timing Advance (TA) based on Msg1. The gNB sends a Random Access Response message to the UE. The Random Access Response includes the Timing Advance information and a subsequent resource (UL grant) for the uplink transmission. The Timing Advance is used for the timing relationship of the UE's subsequent uplink transmission.

[0290] As illustrated in Fig. 4, the CFRA-based two-stage random access process mainly comprises the following:

[0291] Step 0: The gNB sends a message (Msg0) to the UE containing a random access preamble and a PUSCH assignment.

[0292] Step A: After receiving message (Msg0), the UE transmits a random access preamble and PUSCH to gNB via the first message (MsgA).

[0293] Step B: After receiving PUSCH scrambled with a random access preamble and RA-RNTI, gNB determines the RA-RNTI based on the resource location where the random access preamble was received, correctly scrambles PUSCH through the RA-RNTI, and then sends a second message (MsgB) to the UE.

[0294] Specifically, the content included in each message in the aforementioned random access process, and the processing by the UE and gNB, may specifically refer to the content defined in the protocol, which is not described in detail here.

[0295] When a UE transmits signals through satellite cells and ground cells, the latency difference increases, with satellite cells exhibiting significantly longer latency than ground cells. According to the design of existing 5G terrestrial mobile communication systems, the random access process is limited to MAC entities. Generally, satellite cells and ground cells correspond to different MAC entities. Under the design concept of existing mobile communication systems, the random access process of a satellite cell can only be implemented through the satellite cell, which results in extremely long random access latency and can affect the user experience.

[0296] Considering the aforementioned problems, embodiments of the present invention provide a method and apparatus for random access on the terminal side and a method and apparatus for random access on the network side to reduce the overhead of time delay of random access in a satellite communication system.

[0297] The method and the apparatus are based on the same concept. Since the method and the apparatus have similar principles for solving the problem, they can be implemented by referencing each other without any repetitive parts described in detail.

[0298] The technical solution provided in the embodiment of the present invention can be applied to a mobile communication system related to a satellite.

[0299] A terminal device related to embodiments of the present invention may be a device that provides voice and / or data transmission to a user, a portable device having wireless connectivity capabilities, or another processing device connected to a wireless modem. In different systems, the terminal device may have different names. For example, in a 5G system, the terminal device may be referred to as a User Equipment (UE), and the wireless terminal device may be a mobile terminal device such as a computer equipped with a mobile phone (or "mobile phone") and a mobile terminal device that can communicate with one or more core networks via a Radio Access Network (RAN). The mobile terminal device may be, for example, a portable, pocket, handheld, computer-in-vehicle, or vehicle-mounted mobile device that exchanges language and / or data with the Radio Access Network. The mobile terminal device may be, for example, a Personal Communication Service (PCS) phone, a wireless phone, a Session Initiated Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), etc. The above wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, an access point, a remote UE device, an access terminal, a user terminal, a user agent, and a user device, and these are not limited to the embodiments of the present invention.

[0300] In an embodiment according to the present invention, a base station (e.g., an access point) refers to a device that accesses a network and communicates with a wireless terminal through one or more sectors of a wireless interface. The base station may be a router for the wireless terminal and another part of the access network and converts received wireless interface frames and IP packets into one another. Here, the other part of the access network may include an International Protocol (IP) network. The base station may also coordinate the management of wireless interface attributes. For example, the base station, which is a network device related to the embodiments of the present invention, may be, for example, a network device (base transceiver station, BTS) in a Global System for Mobile Communications (GSM) or Code Division Multiple Access (CDMA), a network device (NodeB) in a wide-band code division multiple access (WCDMA), an evolutionary network device (Evolutionary Node B, eNB or e-NodeB) in a Long Term Evolution (LTE) system, a 5G base station, a Home Evolved Node B (HeNB), a relay node, a home base station (femto), a pico cell, etc. in a Next Generation System, and is not limited to the embodiments of the present invention.

[0301] Each embodiment of the present invention will be described in detail together with the accompanying drawings described below. It should be noted that the order of description of the embodiments of the present invention indicates only the order of the embodiments, not the order of the technical solutions provided by the embodiments.

[0302] Example 1

[0303] As illustrated in FIG. 5, the random access system provided by the present invention includes a base station (501) to which a satellite cell belongs, a base station (502), and a user equipment (UE) (503).

[0304] The base station (501) to which the above satellite cell belongs determines the ground cell accessed by the UE, transmits a random access related message to the UE through the ground cell, and indicates that the cell type corresponding to the random access related message is a satellite cell.

[0305] The base station (502) to which the above ground cell belongs receives a random access related message for user equipment (UE) transmitted by the satellite cell, transmits the random access related message to the UE, and indicates that the cell type corresponding to the random access related message is a satellite cell.

[0306] User equipment (UE) (503) receives a random access related message transmitted by a ground cell, determines a cell type corresponding to the random access related message, and the cell type is a ground cell or a satellite cell.

[0307] The UE operates in both satellite and ground cells, allowing it to integrate two types of cell resources, for example, using a dual-connection method. When dual-connection is established, the base station to which the satellite cell belongs can be notified to the base station providing service to the ground cell accessed by the UE, i.e., the base station to which the ground cell belongs.

[0308] The aforementioned random access process may be a four-stage contention-based random access process. The base station to which the satellite cell belongs transmits a random access-related message transmitted by the UE through the base station to which the ground cell belongs, that is, the random access-related message received by the UE from the ground cell is the second message (Msg2) and / or the fourth message (Msg4) of the four-stage contention-based random access; or

[0309] The aforementioned random access process may be a two-stage contention-based random access process. The base station to which the satellite cell belongs transmits a random access-related message transmitted by the UE through the base station to which the ground cell belongs, that is, the random access-related message received by the UE from the ground cell is the second message (MsgB) of the two-stage contention-based random access; or

[0310] The aforementioned random access process may be a four-stage contention-free random access process. The base station to which the satellite cell belongs transmits random access-related messages transmitted by the UE through the base station to which the ground cell belongs, that is, the random access-related messages received by the UE from the ground cell are the first message (Msg0) and the third message (Msg2) of the four-stage contention-free random access.

[0311] When a ground cell and a satellite cell belong to the same base station, the exchange between the ground cell and the satellite cell is implemented within the base station. When a ground cell and a satellite cell belong to different base stations, the satellite cell exchanges some or all of the random access-related messages with the ground cell through an interface between base stations, causing the base station to which the ground cell belongs to transmit the random access-related messages to the UE and indicate that the cell type corresponding to the random access-related messages is a satellite cell.

[0312] In order to enable the UE to distinguish the cell type corresponding to the random access-related message when the base station to which the satellite cell belongs transmits the random access-related message through the terrestrial cell, in this embodiment, the base station to which the satellite cell belongs displays the cell type corresponding to the random access-related message to the UE through the terrestrial cell while transmitting the random access-related message through the terrestrial cell.

[0313] In a random access system provided by an embodiment of the present invention, in the random access process, the satellite cell can reduce the random access delay of the satellite communication system by providing a solution for random access by the satellite cell with the help of the ground cell by transmitting the random access-related message through the ground cell.

[0314] Random access-related messages exchanged through an interface between base stations include the following: the base station to which the satellite cell belongs generates a complete random access-related message and transmits the generated random access-related message to the ground cell through the interface between base stations; or the base station to which the satellite cell belongs transmits part or all of the random access-related message to the ground cell so that the base station to which the ground cell belongs generates a complete random access-related message.

[0315] In the case where the random access process is a four-stage contention-based random access process, what can be exchanged between the base stations to which the satellite cell and the ground cell belong through the interface between base stations may be some or all of the content included in the second message (Msg2) of the four-stage contention-based random access, or the complete Msg2 message.

[0316] In the case where the random access process is a two-stage contention-based random access process, the base stations to which the satellite cell and the ground cell belong exchange through the interface between base stations is some or all of the content included in the second message (MsgB) of the two-stage contention-based random access, or the complete MsgB.

[0317] In the case where the aforementioned random access process is a four-stage contention-free random access process, the base station to which the above satellite cell and ground cell belong exchanges through the interface between base stations may be some or all of the content included in the third message (Msg2) of the four-stage contention-free random access, or the complete Msg2.

[0318] The satellite cell indicates a cell type corresponding to a random access-related message through a ground cell, and the UE determines the cell type corresponding to the random access-related message, which can be implemented in any one of the following ways.

[0319] 1) The cell type corresponding to the random access related message is indicated as a satellite cell through the display information added to the random access related message.

[0320] The base station to which the satellite cell belongs adds display information to the random access-related message and transmits the random access-related message with the added display information to the ground cell.

[0321] Alternatively, the base station to which the satellite cell belongs transmits a random access-related message to the base station to which the ground cell belongs, and the base station to which the ground cell belongs adds display information to the random access-related message.

[0322] The cell type corresponding to the random access-related message is determined through the display information added to the UE random access-related message.

[0323] Optionally, the information displayed above,

[0324] Cell Group ID corresponding to random access-related messages;

[0325] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0326] The cell and / or frequency point ID corresponding to the random access-related message;

[0327] Cell type ID corresponding to the random access-related message;

[0328] RNTI used when transmitting random access-related messages; and

[0329] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0330] Possible implementations of the display information will be described later according to the different random access methods used.

[0331] 1.1) 4-step contention-based random access process;

[0332] The indication information added to the above random access related message includes indication information added to the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4-stage contention-based random access in the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU, and / or indication information added to the fourth message Msg 4 of the 4-stage contention-based random access.

[0333] Specifically, the above-mentioned display information is,

[0334] Cell Group ID corresponding to Msg2 / Msg4;

[0335] TAG number corresponding to Msg2 / Msg4;

[0336] Cell and / or frequency point IDs corresponding to Msg2 / Msg4;

[0337] Cell type ID corresponding to Msg2 / Msg4, satellite cells and ground cells included in the said cell type;

[0338] C-RNTI used by the UE in the cell corresponding to Msg2 / Msg4; and

[0339] It includes at least one of cell display information corresponding to the uplink and / or downlink resources assigned by Msg2 / Msg4.

[0340] In the above method for random access, the UE transmits a third message (Msg3) of four-stage contention-based random access to a satellite cell, and the Msg3 includes a C-RNTI used by the UE in the satellite cell. The satellite cell receives a third message (Msg3) of four-stage contention-based random access transmitted by the base station UE to which the satellite cell belongs, and the Msg3 includes a C-RNTI used by the UE in the satellite cell.

[0341] If a random access-related message transmitted by a station to the base UE to which the ground cell belongs includes a fourth message (Msg4) in a four-stage contention-based random access process, Msg4 is,

[0342] Uplink and / or downlink resources allocated to the UE by the base station to which the satellite cell belongs and used by the UE in the satellite cell; and

[0343] It includes at least one of the C-RNTIs used by the UE in the above satellite cell.

[0344] During the execution period of a contention resolution timer corresponding to contention-based random access of a satellite cell, a random access-related message (Msg4) indicating that the cell type is a satellite cell is received, and if Msg4 includes at least one of an uplink and / or downlink resource assigned to the UE by the base station to which the satellite cell belongs and used by the UE in the satellite cell; and a C-RNTI used by the UE in the satellite cell, the UE determines that the contention resolution is successful.

[0345] 1.2) Two-stage contention-based random access process

[0346] The indication information added to the random access-related message includes the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or the indication information added to the payload portion of the RAR MAC PDU.

[0347] To distinguish between the MsgB of the ground cell itself and the MsgB of the satellite cell, indication information may be added to the payload portion of a subheader or MAC PDU (e.g., successRAR or fallbackRAR) corresponding to the MsgB. Specifically, the indication information is,

[0348] The cell group ID corresponding to MsgB;

[0349] TAG number corresponding to MsgB;

[0350] MsgB corresponds to the cell and / or frequency point ID;

[0351] Cell type ID corresponding to MsgB;

[0352] C-RNTI assigned by the cell corresponding to MsgB; and

[0353] It includes at least one of cell display information corresponding to the uplink and / or downlink resources assigned by MsgB.

[0354] 1.3) 4-Step Contention-Free Random Access Process

[0355] The indication information added to the random access-related message includes the indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or the indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or the indication information added to the payload portion of the RAR MAC PDU.

[0356] The display information added to the above Msg0 / Msg2 is the cell group ID corresponding to Msg0 / 2;

[0357] TAG number corresponding to Msg0 / 2;

[0358] Msg0 / 2 corresponds to the cell and / or frequency point ID;

[0359] Cell type ID corresponding to Msg0 / 2;

[0360] C-RNTI assigned by the cell corresponding to Msg0 / 2; and

[0361] It includes at least one of cell display information corresponding to the uplink and / or downlink resources assigned by Msg0 / 2.

[0362] 2) Using the RNTI of the scrambled random access related message to indicate that the cell type corresponding to the random access related message is a satellite cell;

[0363] Using the RNTI of the scrambled random access related message of the base station to which the ground cell belongs, the cell type corresponding to the said random access related message is indicated as a satellite cell.

[0364] The RNTI of the UE scrambled random access related message is used to determine the cell type corresponding to the said random access related message.

[0365] The above method can be applied in a random access process when the content of the message transmitted by the base station to which the satellite cell belongs is different from the content of the message transmitted by the base station to which the ground cell belongs.

[0366] In this embodiment, when a method for random access of the contention-based random access is employed, the network side configures a first contention resolution timer used for resolving contention of satellite cell contention-based random access for the UE, and configures a second contention resolution timer used for resolving contention of ground cell contention-based random access for the UE. The time length of the configured first contention resolution timer is the same as or different from the time length of the second contention resolution timer, and / or, the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0367] A first contention resolution timer used for contention resolution of satellite cell contention-based random access configured by a network device and a second contention resolution timer used for ground cell contention random access are received, and the time length of the first contention resolution timer is the same as or different from the time length of the second contention resolution timer, and / or, the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0368] As an optional embodiment, the base station to which the satellite cell belongs configures a first contention resolution timer used for contention resolution of satellite cell contention-based random access for the UE, and the base station to which the ground cell belongs configures a second contention resolution timer used for contention resolution of ground cell contention-based random access for the UE.

[0369] Specific random access processes in embodiments of the present invention are described below in combination with different random access methods.

[0370] Implementation 1

[0371] In this embodiment, a CBRA-based 4-step random access process is implemented on a satellite cell through a ground cell.

[0372] It is assumed that the ground cell is the Master Cell Group (MCG), the satellite cell is the Secondary Cell Group (SCG), and the random access process is a 4-step random access based on CBRA. This process can also be applied when the ground cell acts as the SCG and the satellite cell acts as the MCG.

[0373] MCG and SCG are concepts based on Dual Connectivity (DC), which means that a UE can access multiple base stations simultaneously.

[0374] In this embodiment, the main purpose of the random access process in the satellite cell (acting as an SCG) includes, but is not limited to, 1) obtaining uplink synchronization of the UE in the satellite cell and 2) obtaining uplink resources of the UE in the satellite cell.

[0375] As illustrated in Fig. 6, all steps of the random access process are specifically described as follows.

[0376] Step 601: The UE transmits the first message (Msg1) of the 4-step contention-based random access to the satellite cell.

[0377] The above-described message (Msg1) specifically multiplexes a preamble transmission process corresponding to Msg1 defined in the existing 3GPP (third generation partnership project) protocol.

[0378] Step 602: The base station to which the satellite cell belongs determines the content of the second message (Msg2) of the 4th stage contention-based random access.

[0379] The base station to which the satellite cell belongs receives a message (Msg1) transmitted by the UE and determines the content of message (Msg2) based on message (Msg1).

[0380] Step 603: The base station to which the satellite cell belongs exchanges all or part of the content of the message (Msg2) to the UE with the base station to which the ground cell belongs.

[0381] If the satellite cell and the ground cell belong to the same base station, this step may be omitted. If the satellite cell and the ground cell belong to different base stations, an interface between base stations must be introduced for exchange. In particular, the complete message (Msg2) or some or all of the content included in the message (Msg2) may be exchanged through the interface between base stations.

[0382] When the message (Msg2) is encapsulated by the base station to which the satellite cell belongs, the complete message (Msg2) can be exchanged directly.

[0383] When a message (Msg2) is encapsulated in a base station to which a terrestrial cell belongs, some or all of the content included in the message (Msg2) can be exchanged.

[0384] Step 604: The base station to which the ground cell belongs transmits a second message (Msg2) to the UE and indicates that the cell type corresponding to the second message (Msg2) is a satellite cell.

[0385] In order to distinguish between the Msg2 of the ground cell itself and the Msg2 of the satellite cell, it is necessary to add first indication information to the MAC subheader or RAR MAC PDU corresponding to the Msg, and said first indication information may be one of the following or a combination thereof, but is not limited thereto.

[0386] 1) Cell group ID corresponding to Msg2;

[0387] For example, 1 bit is used to identify MCG / SCG and if set to 1, it indicates that Msg 2 corresponds to MCG, and if not set to 1, it indicates that Msg 2 corresponds to SCG.

[0388] 2) The TAG number corresponding to Msg2

[0389] For example, Msg2 can be distinguished through its corresponding TAG ID (e.g., when MCG and SCG have different TAG IDs). If MCG and SCG can have the same TAG ID, a different ID must be combined to distinguish whether Msg2 is for a satellite cell or a ground cell.

[0390] 3) Cell and / or frequency point ID corresponding to Msg2

[0391] 4) Cell type ID corresponding to Msg2

[0392] The cell ID is a cell type ID (for example, 1 bit represents a satellite cell and a ground cell as 0 / 1, respectively, which can be indicated via the R bit field reserved in the existing RAR MAC PDU) or a cell ID.

[0393] 5) C-RNTI used by the UE in the cell corresponding to Msg

[0394] When display information is added to the RAR MAC PDU, the format of the RAR MAC PDU corresponding to the satellite cell may differ from the format of the RAR MAC PDU corresponding to the ground cell.

[0395] 6) Cell display information corresponding to the uplink and / or downlink resources assigned by Msg2.

[0396] Step 605: The UE can transmit a third message (Msg3) to the base station to which the satellite cell belongs.

[0397] In the case of message (Msg3), message (Msg3) includes at least a C-RNTI used by the UE in the satellite cell.

[0398] Step 606: The base station to which the satellite cell belongs exchanges all or part of the content of the fourth message (Msg4) to the UE with the base station to which the ground cell belongs.

[0399] If the satellite cell and the ground cell belong to different base stations, an interface between base stations must be introduced for exchange. What is exchanged through the interface between base stations may be the complete Msg4 or some or all of the content included in the Msg4.

[0400] If Msg4 is encapsulated at the base station to which the satellite cell belongs, the complete Msg4 message can be exchanged directly.

[0401] If Msg4 is encapsulated in the base station to which the ground cell belongs, some or all of the content included in Msg4 can be exchanged.

[0402] The specific content of the message (Msg4) is the uplink and / or downlink resources within the satellite cell allocated to the UE by the satellite cell, or the C-RNTI within the UE's satellite cell.

[0403] Step 607: The UE receives the fourth message (Msg4) through the base station to which the ground cell belongs.

[0404] The base station to which the ground cell belongs receives a message (Msg4) regarding the UE from the base station to which the satellite cell belongs, and then transmits the message (Msg4) to the UE. The network may configure contention resolution timers with different time lengths for contention-based random access contention resolution for the UE used to receive the Msg4 for the ground cell and the Msg4 for the satellite cell, respectively. And / or the times at which the UE starts the contention resolution timers may also be different.

[0405] Additionally, in the case of a satellite cell, if the UE receives one of the following information during the execution period of the contention resolution timer corresponding to the satellite cell, it is determined that contention resolution is successful.

[0406] The UE receives uplink and / or downlink scheduling information for the satellite cell from the ground cell.

[0407] The MAC PDU received by the UE in the ground cell includes a C-RNTI MAC control element (Control Element, CE) used by the UE in the satellite cell.

[0408] Implementation 2

[0409] In this embodiment, a CBRA-based two-stage random access process is implemented on a satellite cell through a base station to which the ground cell belongs.

[0410] Assume that the ground cell is the SCG, the satellite cell is the MCG, and the random access process is two-stage contention-based random access. When the ground cell acts as the SCG and the satellite cell acts as the MCG, the UE generally does not use CBRA-based two-stage random access on the satellite cell.

[0411] In this embodiment, the main purpose of the random access process of the UE on the satellite cell includes, but is not limited to, 1) obtaining uplink synchronization of the UE in the satellite cell and 2) obtaining uplink resources of the UE in the satellite cell.

[0412] As illustrated in Fig. 7, specifically, all steps of random access are described as follows.

[0413] Step 701: The UE transmits a first message (MsgA) of two-stage contention-based random access to the base station to which the satellite cell belongs.

[0414] The above MsgA message includes two parts of content, a preamble and a PUSCH, and specifically multiplexes the MsgA transmission process defined in the existing 3GPP protocol.

[0415] Step 702: The base station to which the satellite cell belongs determines the content of the second message (MsgB).

[0416] The base station to which the satellite cell belongs receives a message (MsgA) transmitted by the UE and determines the content of the message (MsgB) based on the message (MsgA).

[0417] Step 703: The base station to which the satellite cell belongs exchanges all or part of the contents of the MsgB for the UE with the base station to which the ground cell belongs.

[0418] If the satellite cell and the ground cell belong to the same base station, this step may be omitted. If the satellite cell and the ground cell belong to different base stations, an interface between base stations must be introduced for exchange. In particular, through the interface between base stations, the complete message (MsgB) or some or all of the content included in the message (MsgB) may be exchanged.

[0419] When the message (MsgB) is encapsulated by the base station to which the satellite cell belongs, the complete message (MsgB) can be exchanged directly.

[0420] When a message (MsgB) is encapsulated in the base station to which the ground cell belongs, some or all of the content included in the message (MsgB) can be exchanged.

[0421] Step 704: The base station to which the ground cell belongs transmits a second message (MsgB) to the UE and indicates that the cell type corresponding to MsgB is a satellite cell.

[0422] Second indication information may be added to a subheader or MAC PDU (e.g., successRAR or fallbackRAR) corresponding to MsgB. The second indication information is

[0423] The cell group ID corresponding to MsgB;

[0424] TAG number corresponding to MsgB;

[0425] MsgB corresponds to the cell and / or frequency point ID; and

[0426] The cell type ID corresponding to MsgB

[0427] Includes at least one of them.

[0428] For example, in the subheader corresponding to successRAR, the existing reserved bit field (R) can indicate whether the cell type corresponding to successRAR is a satellite cell or a ground cell. The specific format is as shown in FIG. 18.

[0429] C-RNTI assigned by the cell corresponding to MsgB;

[0430] Cell display information corresponding to the uplink and / or downlink resources assigned by MsgB.

[0431] If display information is added to the MAC PDU corresponding to the MsgB, the MAC PDU corresponding to the satellite cell MsgB may differ from the MAC PDU format corresponding to the ground cell MsgB.

[0432] The network may configure different MsgB receiving windows for UEs used to receive MsgB for ground cells and MsgB for satellite cells, respectively. The contention resolution success determination process is the same as the existing two-stage random access process based on CBRA and is not specifically described in this specification.

[0433] Implementation 3

[0434] In this embodiment, a CFRA-based four-stage random access process is implemented on a satellite cell through a ground cell.

[0435] It is assumed that the ground cell is an MCG, the satellite cell is an SCG, and the random access process is a CFRA-based 4-stage random access. In this embodiment, on the satellite cell (acting as an SCG), the primary objective of the UE's random access process includes, but is not limited to, obtaining uplink synchronization on the UE's satellite cell. Specifically, as illustrated in FIG. 8, all steps of the executed random access process are described as follows.

[0436] Step 801: The base station to which the satellite cell belongs transmits the first message (Msg0) to the UE through the ground cell.

[0437] Third indication information must be added to the first message (Msg0), and the third indication information is used to indicate whether the Msg0 is for a satellite cell or a ground cell. The third indication information is

[0438] - Cell group ID corresponding to Msg0;

[0439] - The TAG number corresponding to Msg0;

[0440] - Cell and / or frequency point ID corresponding to Msg0;

[0441] - Cell type ID corresponding to Msg0; and

[0442] - Msg0 includes at least one of the C-RNTIs assigned by the corresponding cell.

[0443] Step 802: After receiving Msg0, the UE transmits the second message (Msg1) in the four-step contention-free random access process to the base station to which the satellite cell belongs.

[0444] The above message (Msg1) includes a preamble, and specifically, multiplexes the preamble transmission process corresponding to Msg1 of CFRA defined in the existing 3GPP protocol.

[0445] Step 803: The base station to which the satellite cell belongs receives a message (Msg1) transmitted by the UE and determines the content of message (Msg2) based on message (Msg1).

[0446] Step 804: The base station to which the satellite cell belongs exchanges all or part of the content of Msg2 for the UE with the base station to which the ground cell belongs and all or part of the content of Msg2 for the UE.

[0447] If the base station to which the satellite cell and the ground cell belong is the same base station, this step may be omitted. If the satellite cell and the ground cell belong to different base stations, an interface between base stations must be introduced for exchange. Specifically, the complete Msg2 or some or all of the content included in Msg2 can be exchanged through the interface between base stations.

[0448] When Msg2 is encapsulated in the satellite cell's base station, the complete message (Msg2) can be exchanged directly.

[0449] When a message (Msg2) is encapsulated in the base station of a ground cell, some or all of the content included in the Msg2 message can be exchanged.

[0450] Step 805: The base station to which the ground cell belongs transmits Msg2 for the satellite cell to the UE.

[0451] In order to distinguish between the Msg2 of the ground cell itself and the Msg2 of the satellite cell, it is necessary to add third indication information to the MAC subheader or RAR MAC PDU corresponding to the Msg. The third indication information may include at least one of the following.

[0452] 1) Cell group ID corresponding to Msg2

[0453] 1 bit is used to identify MCG / SCG and if set to 1, it indicates that Msg 2 corresponds to MCG, otherwise it indicates that Msg 2 is for SCG.

[0454] 2) The TAG number corresponding to Msg2

[0455] If MCG and SCG have different TAG IDs, MCG and SCG can be distinguished from each other. Of course, if MCG and SCG can have the same TAG ID, a different ID must be combined to distinguish whether Msg2 is for a satellite cell or a ground cell.

[0456] 3) Cell and / or frequency point ID corresponding to Msg2

[0457] 4) Cell type ID corresponding to Msg2

[0458] Specifically, the cell ID may be a cell type ID (for example, 1 bit represents a satellite cell and a ground cell as 0 / 1, respectively, which can be represented through the R bit field reserved in the existing RAR MAC PDU) or a cell ID.

[0459] 5) C-RNTI used by the UE in the cell corresponding to Msg

[0460] 6) Cell display information corresponding to the uplink and / or downlink resources assigned by Msg2.

[0461] When display information is added to the above RAR MAC PDU, the format of the RAR MAC PDU corresponding to the satellite cell may differ from the format of the RAR MAC PDU corresponding to the ground cell.

[0462] Example 2

[0463] Embodiments of the present invention provide a method for random access applied to user equipment (UE). The method comprises the following:

[0464] Step 901: Receive a random access related message transmitted by the ground cell.

[0465] Step 902: Determine the cell type corresponding to the random access related message above, and the cell type is a ground cell or a satellite cell.

[0466] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0467] Optionally, determining the cell type corresponding to the above random access-related message is specifically,

[0468] Determining a cell type corresponding to the random access-related message through display information added to the random access-related message; or

[0469] The RNTI of the scrambled random access related message is used to determine the cell type corresponding to the random access related message.

[0470] Optionally, the display information added to the above random access-related message is,

[0471] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0472] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0473] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0474] Optionally, the above display information is,

[0475] Cell Group ID corresponding to random access-related messages;

[0476] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0477] The cell and / or frequency point ID corresponding to the random access-related message;

[0478] Cell type ID corresponding to the random access-related message;

[0479] RNTI used when transmitting random access-related messages; and

[0480] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0481] Optionally, in the above method, also receive a first contention resolution timer used for contention resolution of satellite cell contention-based random access configured by a network device and a second contention resolution timer used for contention resolution of ground cell contention-based random access, wherein the time length of the first contention resolution timer is the same as or different from the time length of the second contention resolution timer, and / or, the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0482] Optionally, in the above method, a third message (Msg3) of four-stage contention-based random access is also transmitted to the satellite cell, and the Msg3 includes a C-RNTI used by the UE in the satellite cell.

[0483] Optionally, in the above method, it is determined that the contention resolution is successful if the random access-related message also includes at least one of the uplink and / or downlink resources used by the UE in the satellite cell and the C-RNTI used by the UE in the satellite cell, by the base station to which the satellite cell belongs.

[0484] A method for random access provided in an embodiment of the present invention is applied to a base station to which a satellite cell belongs, and as illustrated in FIG. 10, the method comprises the following steps.

[0485] Step 1001: Determine the ground cell accessed by the UE.

[0486] Step 1002: Transmit a random access related message to the UE through the ground cell and indicate that the cell type corresponding to the random access related message is a satellite cell.

[0487] Optionally, when the ground cell and the satellite cell belong to different base stations, transmitting a random access-related message to the UE through the ground cell and indicating that the cell type corresponding to the random access-related message is a satellite cell is specifically done by exchanging some or all of the random access-related message with the ground cell through a base station interface.

[0488] Optionally, exchanging some or all of the random access-related messages with the ground cell through a base station interface is specifically,

[0489] The base station to which the satellite cell belongs generates a complete random access related message and transmits the generated random access related message to the ground cell through an interface between base stations; or

[0490] The base station to which the satellite cell belongs transmits part or all of the random access-related message to the ground cell, causing the base station to which the ground cell belongs to generate the complete random access-related message.

[0491] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0492] Optionally, the step of indicating that the cell type corresponding to the random access-related message is a satellite cell is,

[0493] Indicating that the cell type corresponding to the random access-related message is a satellite cell through the indication information added to the random access-related message; or

[0494] The format of the RAR MAC PDU corresponding to the satellite cell uses the wireless network temporary ID (IDRNTI) of the scrambled random access related message to indicate that the cell type corresponding to the said random access related message is a satellite cell.

[0495] Optionally, the display information added to the above random access-related message is,

[0496] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0497] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0498] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0499] Optionally, the above display information is,

[0500] Cell Group ID corresponding to random access-related messages;

[0501] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0502] The cell and / or frequency point ID corresponding to the random access-related message;

[0503] Cell type ID corresponding to the random access-related message;

[0504] RNTI used when transmitting random access-related messages; and

[0505] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0506] Optionally, in the above method, also,

[0507] For the above UE, a first contention resolution timer used for contention resolution of satellite cell contention-based random access is configured, and the length of the first contention resolution timer is the same as or different from the length of a second contention resolution timer used for contention resolution of ground cell contention-based random access;

[0508] and / or

[0509] For the above UE, the start time of the first contention resolution timer is configured, and the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0510] Optionally, in the above method, also receive a third message (Msg3) of four-stage contention-based random access transmitted by the UE, said Msg3 includes a C-RNTI used by the UE in the satellite cell.

[0511] A method for random access provided by an embodiment of the present invention is applied to a base station to which a ground cell belongs, and as illustrated in FIG. 11, said method comprises the following.

[0512] Step 1101: Receive a message regarding random access to the user equipment (UE) transmitted by the satellite cell.

[0513] Step 1102: Transmit the above random access related message to the UE, and indicate that the cell type corresponding to the above random access related message is a satellite cell.

[0514] Optionally, when the ground cell and the satellite cell belong to different base stations, receiving a random access-related message corresponding to a UE transmitted by the satellite cell specifically involves exchanging some or all of the random access-related message with the satellite cell through an interface between base stations.

[0515] Optionally, exchanging some or all of the random access-related messages with the satellite cell through a base station interface is specifically,

[0516] Receive a complete random access related message from the base station to which the satellite cell belongs via a base station interface; or

[0517] Receives all of the random access-related messages transmitted by the satellite cell through the interface between base stations, and receives a complete random access-related message based on all of the said random access-related messages.

[0518] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0519] Optionally, indicating that the cell type corresponding to the random access-related message is a satellite cell is specifically indicated by indicating that the cell type corresponding to the random access-related message is a satellite cell through indication information added to the random access-related message; or

[0520] Using the RNTI of the scrambled random access related message, the cell type corresponding to the random access related message is indicated as a satellite cell.

[0521] Optionally, the display information added to the above random access-related message is,

[0522] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0523] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0524] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0525] Optionally, the above display information is,

[0526] Cell Group ID corresponding to random access-related messages;

[0527] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0528] The cell and / or frequency point ID corresponding to the random access-related message;

[0529] Cell type ID corresponding to the random access-related message;

[0530] RNTI used when transmitting random access-related messages; and

[0531] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0532] Optionally, in the above method, also,

[0533] A second contention resolution timer is configured for the above UE for contention resolution of ground cell contention-based random access, and the length of the second contention resolution timer is different from the length of the first contention resolution timer used for contention resolution of satellite cell contention-based random access;

[0534] and / or

[0535] For the above UE, the start time of the second contention resolution timer is configured, and the start time of the second contention resolution timer is different from the start time of the first contention resolution timer.

[0536] Optionally, if the random access-related message includes a fourth message (Msg4) in a four-stage contention-based random access process, the Msg4 is,

[0537] Uplink and / or downlink resources allocated to the UE by the base station to which the satellite cell belongs and used by the UE in the satellite cell; and

[0538] It includes at least one of the C-RNTIs used by the UE in the above satellite cell.

[0539] The method for random access applied to a UE provided in the embodiment of the present invention and the UE of Embodiment 1 provided in the present invention belong to the same inventive concept and can be applied to various implementations of random access applied to a UE of a system provided by the aforementioned embodiment. It can be applied to the method for random access applied to a UE according to the present embodiment and is not described in further detail.

[0540] The method for random access applied to a base station to which a satellite cell belongs, provided in the embodiment of the present invention, and the base station to which a satellite cell belongs according to the aforementioned embodiment 1 of the present invention belong to the same inventive concept and can be applied to various implementations of random access applied to a base station to which a satellite cell of the system provided by the above embodiment. It can be applied to the method for random access applied to a base station to which a satellite cell belongs according to the present embodiment and is not described in further detail.

[0541] The method for random access applied to a base station to which a ground cell belongs, provided in an embodiment of the present invention, is applicable to a base station to which a ground cell belongs according to the aforementioned embodiment 1 of the present invention, which belongs to the same inventive concept, and is not described in further detail.

[0542] Example 3

[0543] The random access device provided by the present invention is applied to the UE side and includes a processor (1200), memory (1201), transceiver (1202), and bus interface (1203), as shown in FIG. 12.

[0544] The processor (1200) is responsible for managing the bus architecture and general processing, and the memory (1201) can store data used when the processor (1200) is operating. The transceiver (1202) is configured to receive and transmit data under the control of the processor (1200).

[0545] The bus architecture may include any number of interconnected buses and bridges, specifically connected by various circuits of one or more processors, including the processor (1200), and memory, including the memory (1201). The bus architecture may connect various other circuits together, such as peripheral devices, current cutoff devices, and power management circuits. This is a well-known fact in the field of the present invention and will not be described further. The bus interface provides an interface. The processor (1200) is responsible for managing the bus architecture and general processing, and the memory (1201) can store data used when the processor (1200) is operating.

[0546] The flow of the embodiment according to the present invention may be applied to or carried out by the processor (1200). In the course of implementation, each step of the signal processing flow is implemented by an integrated logic circuit of hardware or a software instruction within the processor (1200). The processor (1200) may be a general-purpose processor, a digital signal processor, a feature integrated circuit, a field-programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may carry out or implement the method, steps, and block diagram described in the embodiment according to the present invention. The general-purpose processor may be a micro processor or any normal processor, etc. The steps of the method described in the embodiment according to the present invention may be carried out and completed by a hardware processor, or implemented to be carried out and completed by a combination of hardware and software modules in the processor. The software module may be a watch memory medium in the field, such as random memory, flash memory, read-only memory, programmable read-only memory or electrically eraseable / writable programmable memory, or a register. The memory medium is embedded in the memory (1201), and the processor (1200) reads the information within the memory (1201) and combines it with other hardware to complete the signal processing step of the flow.

[0547] Specifically, the processor (1200) reads a program from memory (1201), and

[0548] Receive random access-related messages transmitted by a ground cell via a transceiver;

[0549] Determine the cell type corresponding to the above random access related message, and the cell type is a ground cell or a satellite cell.

[0550] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0551] Optionally, the processor determining the cell type corresponding to the random access-related message specifically includes:

[0552] Determining a cell type corresponding to the random access-related message through display information added to the random access-related message; or

[0553] The RNTI of the scrambled random access related message is used to determine the cell type corresponding to the random access related message.

[0554] Optionally, the display information added to the above random access-related message is,

[0555] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0556] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0557] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0558] Optionally, the above display information is,

[0559] Cell Group ID corresponding to random access-related messages;

[0560] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0561] The cell and / or frequency point ID corresponding to the random access-related message;

[0562] Cell type ID corresponding to the random access-related message;

[0563] RNTI used when transmitting random access-related messages; and

[0564] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0565] Optionally, the processor also receives, via a transceiver, a first contention resolution timer used for contention resolution of satellite cell contention-based random access configured by a network device and a second contention resolution timer used for contention resolution of ground cell contention-based random access, wherein the time length of the first contention resolution timer is equal to or different from the time length of the second contention resolution timer, and / or, the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0566] Optionally, the processor also transmits a third message (Msg3) of four-stage contention-based random access to the satellite cell via a transceiver, and the Msg3 includes a C-RNTI used by the UE in the satellite cell.

[0567] Optionally, the processor also determines that the contention resolution is successful if the random access-related message includes one of the uplink and / or downlink resources used by the UE in the satellite cell and assigned to the UE by the base station to which the satellite cell belongs; and one of the C-RNTIs used by the UE in the satellite cell.

[0568] A random access device provided in an embodiment of the present invention is applied to a satellite cell and includes a processor (1300), a memory (1301), a transceiver (1302), and a bus interface (1303), as shown in FIG. 13.

[0569] The processor (1300) is responsible for managing the bus architecture and general processing, and the memory (1301) can store data used when the processor (1300) is operating. The transceiver (1302) is configured to receive and transmit data under the control of the processor (1300).

[0570] The bus architecture may include any number of interconnected buses and bridges, specifically connected by various circuits of one or more processors, including the processor (1300), and memory, including memory (1301). The bus architecture may connect various other circuits together, such as peripheral devices, current cutoff devices, and power management circuits. This is a well-known fact in the field of the present invention and will not be described further. The bus interface provides an interface. The processor (1300) is responsible for managing the bus architecture and general processing, and the memory (1301) can store data used when the processor (1300) is operating.

[0571] The flow of the embodiment according to the present invention may be applied to or carried out by the processor (1300). In the course of implementation, each step of the signal processing flow is implemented by an integrated logic circuit of hardware or a software instruction within the processor (1300). The processor (1300) may be a general-purpose processor, a digital signal processor, a feature integrated circuit, a field-programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may carry out or implement the method, steps, and block diagram described in the embodiment according to the present invention. The general-purpose processor may be a micro processor or any normal processor, etc. The steps of the method described in the embodiment according to the present invention may be carried out and completed by a hardware processor, or implemented to be carried out and completed by a combination of hardware and software modules in the processor. The software module may be a watch memory medium in the field, such as random memory, flash memory, read-only memory, programmable read-only memory or electrically eraseable / writable programmable memory, or a register. The memory medium is embedded in memory (1301), and the processor (1300) reads information within memory (1301) and combines other hardware to complete the signal processing step of the flow.

[0572] Specifically, the processor (1300) reads a program from memory (1301), and

[0573] Determine the ground cell accessed by the UE;

[0574] A random access-related message is transmitted to the UE through the above ground cell, and the cell type corresponding to the random access-related message is indicated as a satellite cell.

[0575] Optionally, when the ground cell and the satellite cell belong to different base stations, the processor transmits a random access-related message to the UE through the ground cell and indicates that the cell type corresponding to the random access-related message is a satellite cell, specifically,

[0576] Some or all of the random access-related messages are exchanged with the ground cell through the interface between base stations.

[0577] Optionally, the processor exchanging some or all of the random access-related messages with the ground cell through a base station interface is specifically,

[0578] Generate a complete random access-related message, and transmit the generated random access-related message to the ground cell by a transceiver through a base station interface; or

[0579] Part or all of the random access-related messages are transmitted to a ground cell via a transceiver, and a complete random access-related message is generated by the base station to which the ground cell belongs.

[0580] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0581] Optionally, the processor indicates that the cell type corresponding to the random access-related message is a satellite cell, specifically,

[0582] Indicating that the cell type corresponding to the random access-related message is a satellite cell through the indication information added to the random access-related message; or

[0583] Using the RNTI of the scrambled random access related message, the cell type corresponding to the random access related message is indicated as a satellite cell.

[0584] Optionally, the display information added to the above random access-related message is,

[0585] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0586] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0587] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0588] Optionally, the above display information is,

[0589] Cell Group ID corresponding to random access-related messages;

[0590] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0591] The cell and / or frequency point ID corresponding to the random access-related message;

[0592] Cell type ID corresponding to the random access-related message;

[0593] RNTI used when transmitting random access-related messages; and

[0594] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0595] Optionally, the processor also,

[0596] For the above UE, a first contention resolution timer used for contention resolution of satellite cell contention-based random access is configured, and the length of the first contention resolution timer is the same as or different from the length of a second contention resolution timer used for contention resolution of ground cell contention-based random access;

[0597] and / or

[0598] For the above UE, the start time of the first contention resolution timer is configured, and the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0599] Optionally, the processor also,

[0600] A third message (Msg3) of four-stage contention-based random access transmitted by the UE through a transceiver is received, and said Msg3 includes a C-RNTI used by the UE in said satellite cell.

[0601] A random access device provided by an embodiment of the present invention is applied to a ground cell and includes a processor (1400), a memory (1401), a transceiver (1402), and a bus interface (1403), as shown in FIG. 14.

[0602] The processor (1400) is responsible for managing the bus architecture and general processing, and the memory (1401) can store data used when the processor (1400) is operating. The transceiver (1402) is configured to receive and transmit data under the control of the processor (1400).

[0603] The bus architecture may include any number of interconnected buses and bridges, specifically connected by various circuits of one or more processors, including the processor (1400), and memory, including memory (1401). The bus architecture may connect various other circuits together, such as peripheral devices, current cutoff devices, and power management circuits. This is a well-known fact in the field of the present invention and will not be described further. The bus interface provides an interface. The processor (1400) is responsible for managing the bus architecture and general processing, and the memory (1401) can store data used when the processor (1400) is operating.

[0604] The flow of the embodiment according to the present invention may be applied to or carried out by the processor (1400). In the course of implementation, each step of the signal processing flow is implemented by an integrated logic circuit of hardware or a software instruction within the processor (1400). The processor (1400) may be a general-purpose processor, a digital signal processor, a feature integrated circuit, a field-programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may carry out or implement the method, steps, and block diagram described in the embodiment according to the present invention. The general-purpose processor may be a micro processor or any normal processor, etc. The steps of the method described in the embodiment according to the present invention may be carried out and completed by a hardware processor, or implemented to be carried out and completed by a combination of hardware and software modules in the processor. The software module may be a watch memory medium in the field, such as random memory, flash memory, read-only memory, programmable read-only memory or electrically eraseable / writable programmable memory, or a register. The memory medium is embedded in the memory (1401), and the processor (1400) reads the information within the memory (1401) and combines it with other hardware to complete the signal processing step of the flow.

[0605] Specifically, the processor (1400) reads a program from memory (1401), and

[0606] Receive a random access-related message for a user device (UE) transmitted by a satellite cell via a transceiver;

[0607] The above random access-related message is transmitted to the UE, and the cell type corresponding to the above random access-related message is indicated as a satellite cell.

[0608] Optionally, if the ground cell and the satellite cell belong to different base stations, the processor receives a random access-related message transmitted by the satellite cell through a transceiver, specifically exchanging some or all of the random access-related message with the base station to which the satellite cell belongs through a base station interface.

[0609] Optionally, the processor exchanging some or all of the random access-related messages with the satellite cell through a base station interface is specifically,

[0610] Receive a complete random access-related message from the base station to which the satellite cell belongs via a transceiver through a base station interface; or

[0611] Through the interface between base stations, the transceiver receives all of the random access-related messages from the base station to which the satellite cell belongs, and receives a complete random access-related message based on all of the said random access-related messages.

[0612] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0613] Optionally, the processor indicates that the cell type corresponding to the random access-related message is a satellite cell, specifically,

[0614] Indicating that the cell type corresponding to the random access-related message is a satellite cell through the indication information added to the random access-related message; or

[0615] Using the RNTI of the scrambled random access related message, the cell type corresponding to the random access related message is indicated as a satellite cell.

[0616] Optionally, the display information added to the above random access-related message is,

[0617] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0618] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0619] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0620] Optionally, the above display information is,

[0621] Cell Group ID corresponding to random access-related messages;

[0622] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0623] The cell and / or frequency point ID corresponding to the random access-related message;

[0624] Cell type ID corresponding to the random access-related message;

[0625] RNTI used when transmitting random access-related messages; and

[0626] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0627] Optionally, the processor also,

[0628] A second contention resolution timer is configured for the above UE for contention resolution of ground cell contention-based random access, and the length of the second contention resolution timer is different from the length of the first contention resolution timer used for contention resolution of satellite cell contention-based random access;

[0629] and / or

[0630] For the above UE, the start time of the second contention resolution timer is configured, and the start time of the second contention resolution timer is different from the start time of the first contention resolution timer.

[0631] Optionally, if the random access-related message includes a message (Msg4) in a CBRA-based 4-step random access process, the message (Msg4) is,

[0632] Uplink and / or downlink resources allocated to the UE by the base station to which the satellite cell belongs and used by the UE in the satellite cell; and

[0633] C-RNTI used by the UE in the above satellite cell

[0634] Includes at least one of them.

[0635] The device for random access applied to a satellite cell provided by the embodiment of the present invention belongs to the same inventive concept as the base station to which the satellite cell according to Embodiment 1 of the present invention belongs, and can be applied to various embodiments of random access applied to the base station to which the satellite cell of the system provided by the embodiment belongs, and can be applied to the device for random access applied to a satellite cell according to the present embodiment, and is not described in detail.

[0636] The device for random access applied to the above ground cell provided by the embodiment of the present invention belongs to the same inventive concept as the base station to which the ground cell according to Embodiment 1 of the present invention belongs, and can be applied to various embodiments of random access applied to the base station to which the ground cell within the system provided by the above embodiment belongs, and can be applied to the device for random access applied to the ground cell according to the present embodiment, and is not described in detail.

[0637] The device for random access applied to the UE side provided by the embodiment of the present invention is the same inventive concept as the UE according to Embodiment 1 of the present invention and can be applied to various embodiments of the UE provided by the embodiment, and can be applied to the device for random access applied to the UE side according to the present embodiment, and is not described in detail.

[0638] The device for random access applied to the UE side provided by the present invention, as shown in FIG. 15,

[0639] A message receiving unit (1501) configured to receive random access-related messages transmitted by a ground cell; and

[0640] It includes a cell type determination unit (1502) configured to determine a cell type corresponding to the above random access related message.

[0641] The above cell type is a ground cell or a satellite cell.

[0642] The above random access related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0643] Optionally, the cell type determination unit determines the cell type corresponding to the random access-related message specifically,

[0644] Determining a cell type corresponding to the random access-related message through display information added to the random access-related message; or

[0645] The RNTI of the scrambled random access related message is used to determine the cell type corresponding to the random access related message.

[0646] Optionally, the display information added to the above random access-related message is,

[0647] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0648] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0649] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0650] Optionally, the above display information is,

[0651] Cell Group ID corresponding to random access-related messages;

[0652] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0653] The cell and / or frequency point ID corresponding to the random access-related message;

[0654] Cell type ID corresponding to the random access-related message;

[0655] RNTI used when transmitting random access-related messages; and

[0656] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0657] Optionally, it further includes a timer configuration receiving unit configured to receive a first contention resolution timer used for contention resolution of satellite cell contention-based random access configured by a network device and a second contention resolution timer used for contention resolution of ground cell contention-based random access.

[0658] The time length of the first competition resolution timer is the same as or different from the time length of the second competition resolution timer, and / or, the start time of the first competition resolution timer is different from the start time of the second competition resolution timer.

[0659] Optionally, it further includes a message transmission unit configured to transmit a third message (Msg3) of four-stage contention-based random access to a satellite cell.

[0660] The above Msg3 includes a C-RNTI used by the UE in the satellite cell.

[0661] Optionally, it includes a contention resolution unit.

[0662] The contention resolution unit determines that the contention resolution is successful if the random access-related message includes one of the uplink and / or downlink resources used by the UE in the satellite cell and the C-RNTI used by the UE in the satellite cell, and the random access-related message is assigned to the UE by the base station to which the satellite cell belongs.

[0663] The device for random access provided by the present invention is applied to a satellite cell, and as shown in FIG. 16,

[0664] A ground cell determination unit (1601) configured to determine the ground cell accessed by the UE; and

[0665] It includes a message transmission unit (1602) configured to transmit a random access-related message to the UE through the ground cell and to indicate that the cell type corresponding to the random access-related message is a satellite cell.

[0666] When the ground cell and the satellite cell belong to different base stations, the message transmission unit transmits a random access-related message to the UE through the ground cell and indicates that the cell type corresponding to the random access-related message is a satellite cell, specifically by exchanging part or all of the random access-related message with the ground cell through an interface between base stations.

[0667] Optionally, the message transmission unit exchanges part or all of the random access-related messages with the ground cell through a base station interface, specifically,

[0668] The base station to which the satellite cell belongs generates a complete random access related message and transmits the generated random access related message to the ground cell through an interface between base stations; or

[0669] The base station to which the satellite cell belongs transmits part or all of the random access-related message to the ground cell, causing the base station to which the ground cell belongs to generate the complete random access-related message.

[0670] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0671] Optionally, the message transmission unit indicates that the cell type corresponding to the random access-related message is a satellite cell, specifically,

[0672] Indicating that the cell type corresponding to the random access-related message is a satellite cell through the indication information added to the random access-related message; or

[0673] Using the RNTI of the scrambled random access related message, the cell type corresponding to the random access related message is indicated as a satellite cell.

[0674] Optionally, the display information added to the above random access-related message is,

[0675] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0676] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0677] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0678] Optionally, the above display information is,

[0679] Cell Group ID corresponding to random access-related messages;

[0680] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0681] The cell and / or frequency point ID corresponding to the random access-related message;

[0682] Cell type ID corresponding to the random access-related message;

[0683] RNTI used when transmitting random access-related messages; and

[0684] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0685] Optionally, for the UE, further includes a timer configuration unit that configures a first contention resolution timer used for contention resolution of satellite cell contention-based random access.

[0686] The length of the first contention resolution timer is equal to or different from the length of the second contention resolution timer used for contention resolution of ground cell contention-based random access; and / or, the start time of the first contention resolution timer is configured for the UE, and the start time of the first contention resolution timer is different from the start time of the second contention resolution timer.

[0687] Optionally, the message receiving unit also receives a third message (Msg3) of four-stage contention-based random access transmitted by the UE, said Msg3 includes a C-RNTI used by the UE in the satellite cell.

[0688] The device for random access provided by the present invention is applied to a ground cell, and as shown in FIG. 17,

[0689] A message receiving unit (1701) configured to receive random access related messages for user equipment (UE) transmitted by a satellite cell; and

[0690] It includes a message transmission unit (1702) configured to transmit the above random access related message to the UE and to indicate that the cell type corresponding to the above random access related message is a satellite cell.

[0691] When the ground cell and the satellite cell belong to different base stations, the message receiving unit receiving a random access-related message corresponding to a UE transmitted by the satellite cell specifically exchanges part or all of the random access-related message with the satellite cell through an interface between base stations.

[0692] Optionally, the message receiving unit exchanges part or all of the random access-related messages with the satellite cell through a base station interface, specifically,

[0693] Receive a complete random access related message from the base station to which the satellite cell belongs via a base station interface; or

[0694] Receives all of the random access-related messages transmitted by the satellite cell through the interface between base stations, and receives a complete random access-related message based on all of the said random access-related messages.

[0695] Optionally, the random access-related messages include a second message (Msg2) and / or a fourth message (Msg4) of 4-stage contention-based random access, or a second message (MsgB) of 2-stage contention-based random access, or a first message (Msg0) and a third message (Msg2) of 4-stage contention-free random access.

[0696] Optionally, the message transmission unit indicates that the cell type corresponding to the random access-related message is a satellite cell, specifically,

[0697] Indicating that the cell type corresponding to the random access-related message is a satellite cell through the indication information added to the random access-related message; or

[0698] Using the RNTI of the scrambled random access related message, the cell type corresponding to the random access related message is indicated as a satellite cell.

[0699] Optionally, the display information added to the above random access-related message is,

[0700] Indication information added to the Media Access Control (MAC) subheader or the payload portion of the RAR MAC PDU in the Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to the second message (Msg2) of the 4th stage contention-based random access, and / or indication information added to the fourth message Msg 4 of the 4th stage contention-based random access; or

[0701] Marking information added to the MAC subheader of the RAR MAC PDU corresponding to the second message (MsgB) of the two-stage contention-based random access, or to the payload portion of the RAR MAC PDU; or

[0702] It includes indication information added to the first message (Msg0) of the 4th stage contention-free random access, and / or, indication information added to the MAC subheader of the RAR MAC PDU corresponding to the third message (Msg3) of the 4th stage contention-free random access, or to the payload portion of the RAR MAC PDU.

[0703] Optionally, the above display information is,

[0704] Cell Group ID corresponding to random access-related messages;

[0705] Timing Advance Group (TAG) ID corresponding to random access-related messages;

[0706] The cell and / or frequency point ID corresponding to the random access-related message;

[0707] Cell type ID corresponding to the random access-related message;

[0708] RNTI used when transmitting random access-related messages; and

[0709] It includes any one or any combination of cell indication information corresponding to uplink and / or downlink resources assigned by a random access response message.

[0710] Optionally, it further includes a timer configuration unit that configures a second contention resolution timer used for contention resolution of ground cell contention-based random access for the UE.

[0711] The length of the second contention resolution timer is different from the length of the first contention resolution timer used for contention resolution of satellite cell contention-based random access; and / or, the start time of the second contention resolution timer is configured for the UE, and the start time of the second contention resolution timer is different from the start time of the first contention resolution timer.

[0712] Optionally, if the random access-related message includes a fourth message (Msg4) in a four-stage contention-based random access process, the Msg4 is,

[0713] Uplink and / or downlink resources allocated to the UE by the base station to which the satellite cell belongs and used by the UE in the satellite cell; and

[0714] It includes at least one of the C-RNTIs used by the UE in the above satellite cell.

[0715] The device for random access applied to a satellite cell provided by the embodiment of the present invention belongs to the same inventive concept as the base station to which the satellite cell according to Embodiment 1 of the present invention belongs, and can be applied to various embodiments of random access applied to the base station to which the satellite cell of the system provided by the embodiment belongs, and can be applied to the device for random access applied to a satellite cell according to the present embodiment, and is not described in detail.

[0716] The device for random access applied to the above ground cell provided by the embodiment of the present invention belongs to the same inventive concept as the base station to which the ground cell according to Embodiment 1 of the present invention belongs, and can be applied to various embodiments of random access applied to the base station to which the ground cell within the system provided by the above embodiment belongs, and can be applied to the device for random access applied to the ground cell according to the present embodiment, and is not described in detail therein.

[0717] The device for random access applied to the UE side provided by the embodiment of the present invention belongs to the same inventive concept as the UE according to Embodiment 1 of the present invention and can be applied to various embodiments of the UE of the system provided by the embodiment, and can be applied to the device for random access applied to the UE side according to the present embodiment, and this is not described in detail.

[0718] Embodiments of the present invention further provide a computer program medium for storing a computer program. When the computer program is executed by a processor, it implements the steps of a method for random access applied to a base station to which the satellite cell provided in Embodiment 2 above belongs.

[0719] The present invention further provides a computer program medium for storing a computer program. When the computer program is executed by a processor, it implements the steps of a method for random access applied to a base station to which the ground cell provided in Example 2 above belongs.

[0720] Embodiments of the present invention further provide a computer program medium for storing a computer program. When the computer program is executed by a processor, it implements the steps of a method for random access applied to a UE provided in Embodiment 2 above.

[0721] It should be understood that in some of the embodiments provided in the present invention, the disclosed systems, devices, and methods may be implemented in different ways. For example, the device embodiments described above are merely schematic. For example, the partitioning of modules is merely the partitioning of logical functions, and other partitioning methods may be used in actual implementation. For example, multiple modules or assemblies may be combined or integrated into different systems, or some functions may be omitted or not executed. Additionally, the coupling, direct coupling, or communication connection to one another shown or discussed may be an indirect coupling or communication connection through some interface, device, or module, which may be electrical, mechanical, etc.

[0722] Modules described as separate components may or may not be physically separated. Components indicated as modules may or may not be physical modules. That is, they may be located in one place or distributed across multiple network modules. To implement the solution for the present embodiment, some or all of the modules may be selected according to actual needs.

[0723] In addition, in each embodiment of the present invention, all functional modules may be integrated into a single processing module. Each module may exist physically separately. Two or more modules may be integrated into a single module. The aforementioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and is sold or used as an independent product, it may be stored on a single computer-readable storage medium.

[0724] In the embodiments described above, all or part of the modules may be implemented through software, hardware, firmware, or any combination thereof. When implemented through software, all or part of the modules may be implemented in the form of a computer program product.

[0725] The above computer program product includes one or more computer instructions. When loaded and executed on a computer, the computer program instructions generate all or part of the procedures or functions according to embodiments of the present invention. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions are stored on a computer-readable storage medium or are transferred from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted via a wired method (e.g., coaxial cable, fiber optic, and Digital Subscriber Line (DSL)) or a wireless method (e.g., infrared, radio, microwave, etc.) from a website, computer, server, or data center. The computer-readable storage medium may be any available medium that a computer can store, or a storage device such as an integrated server or data center that includes one or more available media. Available media may be magnetic media (e.g., floppy disk, hard disk, or tape), optical media (e.g., digital video disc (DVD), semiconductor media (e.g., SSD), etc.

[0726] The technical solution provided by the present invention is described in detail above, and the principles and embodiments of the present invention are described by applying specific examples of the present invention. The description of the above embodiments is used solely for the purpose of aiding in understanding the methods and core ideas of the present invention. Furthermore, based on the spirit of the present invention, those skilled in the art will modify specific implementations and scopes of application. In conclusion, the content of the description should not be interpreted as limiting the present invention.

[0727] It will be apparent to those skilled in the art that embodiments of this application may provide a method, a system, or a computer program product. Accordingly, this application may use full hardware embodiments, full software embodiments, or embodiments combining software and hardware aspects. Additionally, this application may use a computer program product format implemented on a computer-usable storage medium (including, but not limited to, disk memory, CD-ROM, and optical memory) containing one or more computer-executable program codes.

[0728] The present invention has been described with reference to the flowcharts and / or block diagrams of the method, device, and computer program product of the present application. It should be understood that computer program instructions can achieve each flow and / or block in the flowchart and / or block diagram, and combinations of flows and / or blocks in the flowchart and / or block diagram. Such computer program instructions can be provided to a processor of a general-purpose computer, a dedicated computer, an embedded processor, or other programmable data processing device to create a machine, which creates a device configured to achieve a specified function in one flow and / or multiple flows of the flowchart and / or one block and / or multiple blocks of the block diagram through instructions executed by the processor of the computer or other programmable data processing device.

[0729] These computer program instructions may be stored in computer-readable memory that induces a computer or other programmable data processing device to operate in a specific manner, and the instructions stored in said computer-readable memory cause a manufactured product including an instruction device to be produced, and said instruction device executes a specified function in one flow and / or multiple flows of a flowchart and / or one block and / or multiple blocks of a block diagram.

[0730] These computer program instructions may be mounted on a computer or other programmable data processing device, which performs a series of operation procedures on the computer or other programmable data processing device to generate a process performed by the computer, and thus the instructions performed on the computer or other programmable data processing device provide a procedure designed to achieve a specified function in one flow and / or multiple flows of a flowchart and / or one block and / or multiple blocks of a block diagram.

[0731] It is evident that those skilled in the art with ordinary knowledge in this field may make various modifications and changes to this application without departing from the subject matter and scope of this application. Thus, where such modifications and changes to this application fall within the scope of the claims and equivalent technical scope of this application, this application is intended to include such modifications and changes.

Claims

Claim 1 A method for random access applied to user equipment (UE), comprising: receiving a random access-related message transmitted by a ground cell; determining a cell type corresponding to the random access-related message, wherein the cell type is a ground cell or a satellite cell; wherein the step of determining the cell type corresponding to the random access-related message comprises: determining the cell type corresponding to the random access-related message through indication information included in the random access-related message; or determining the cell type corresponding to the random access-related message using a scrambled wireless network temporary ID (RNTI) of the random access-related message. Claim 2 A method for random access according to claim 1, wherein the random access-related message comprises at least one of Msg2 and Msg4 of 4-stage contention-based random access, or MsgB of 2-stage contention-based random access, or Msg0 and Msg2 of 4-stage contention-free random access. Claim 3 delete Claim 4 In claim 1, the indication information included in the random access-related message comprises: indication information added to the Media Access Control (MAC) subheader of the Random Access Response Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to Msg2 of the 4-stage contention-based random access; indication information added to the payload portion of the RAR MAC PDU corresponding to Msg2 of the 4-stage contention-based random access; indication information added to Msg 4 of the 4-stage contention-based random access; the indication information added to the MAC subheader of the RAR MAC PDU corresponding to Msg2 of the 4-stage contention-based random access and the indication information added to Msg4 of the 4-stage contention-based random access; the indication information added to the payload portion of the RAR MAC PDU corresponding to Msg2 of the 4-stage contention-based random access and the indication information added to Msg4 of the 4-stage contention-based random access; Marking information added to the MAC subheader of a RAR MAC PDU corresponding to MsgB of 2-stage contention-based random access; marking information added to the payload portion of a RAR MAC PDU corresponding to MsgB of 2-stage contention-based random access; marking information added to Msg0 of 4-stage contention-free random access; marking information added to the MAC subheader of a RAR MAC PDU corresponding to Msg2 of 4-stage contention-free random access; marking information added to the payload portion of a RAR MAC PDU corresponding to Msg2 of 4-stage contention-free random access; the marking information added to Msg0 of 4-stage contention-free random access and the marking information added to the MAC subheader of a RAR MAC PDU corresponding to Msg2 of 4-stage contention-free random access; The above indication information added to Msg0 of the above 4-stage contention-free random access and the above indication information added to the payload portion of the RAR MAC PDU corresponding to Msg2 of the above 4-stage contention-free random access;A method for random access characterized by including any one of the following.; Claim 5 A method for random access according to claim 1, wherein the display information comprises at least one of: a Cell Group ID corresponding to the random access related message; a Timing Advance Group (TAG) ID corresponding to the random access related message; at least one of a Cell and Frequency Point ID corresponding to the random access related message; a Cell Type ID corresponding to the random access related message; a Radio Network Temporary ID (RNTI) used when the random access related message is transmitted; and cell display information corresponding to an uplink resource and cell display information corresponding to a downlink resource assigned by the random access response message; and any combination thereof. Claim 6 A method for random access according to claim 1, further comprising the step of receiving a first contention resolution timer used for contention resolution of satellite cell contention-based random access configured by a network device and a second contention resolution timer used for contention resolution of ground cell contention-based random access, wherein the first contention resolution timer and the second contention resolution timer satisfy at least one of the following: the time length of the first contention resolution timer is the same as or different from the time length of the second contention resolution timer; and the start time of the first contention resolution timer is different from the start time of the second contention resolution timer. Claim 7 A method for random access according to claim 1, further comprising at least one of the steps of: transmitting a Msg3 of four-stage contention-based random access to a satellite cell, wherein the Msg3 includes a Cell Radio Network Temporary ID (C-RNTI) used by the UE in the satellite cell; determining that contention resolution is successful if the random access-related message includes at least one of an uplink resource and a downlink resource assigned to the UE by the base station to which the satellite cell belongs and used by the UE in the satellite cell; and at least one of the C-RNTI used by the UE in the satellite cell. Claim 8 A method for random access applied to a base station to which a satellite cell belongs comprises: a step of determining a ground cell for user equipment (UE) access; and a step of transmitting a random access-related message to the UE through said ground cell and indicating that the cell type corresponding to said random access-related message is a satellite cell, wherein the step of indicating that the cell type corresponding to said random access-related message is a satellite cell comprises: a step of indicating that the cell type corresponding to said random access-related message is a satellite cell through indication information included in said random access-related message; or a step of indicating that the cell type corresponding to said random access-related message is a satellite cell by using a scrambled wireless network temporary ID (RNTI) of said random access-related message. Claim 9 A method for random access according to claim 8, wherein when the ground cell and the satellite cell belong to different base stations, the step of transmitting a random access-related message to the UE through the ground cell and indicating that the cell type corresponding to the random access-related message is a satellite cell comprises: the step of exchanging part or all of the random access-related message with the ground cell through a base station interface. Claim 10 A method for random access according to claim 9, wherein the step of exchanging part or all of the random access-related message with the ground cell through the inter-base station interface comprises: the step of the base station to which the satellite cell belongs generating a complete random access-related message and transmitting the generated random access-related message to the ground cell through the inter-base station interface; or the step of the base station to which the satellite cell belongs transmitting part or all of the random access-related message to the ground cell so that the base station to which the ground cell belongs generates a complete random access-related message. Claim 11 delete Claim 12 A method for random access applied to a base station to which a ground cell belongs, comprising: receiving a random access-related message for a user equipment (UE) transmitted by a satellite cell; and transmitting the random access-related message to the UE and indicating that the cell type corresponding to the random access-related message is a satellite cell; wherein the step of indicating that the cell type corresponding to the random access-related message is a satellite cell comprises: indicating that the cell type corresponding to the random access-related message is a satellite cell through indication information included in the random access-related message; or indicating that the cell type corresponding to the random access-related message is a satellite cell using a scrambled wireless network temporary ID (RNTI) of the random access-related message. Claim 13 A method for random access according to claim 12, wherein when the ground cell and the satellite cell belong to different base stations, the step of receiving a random access-related message corresponding to a UE transmitted by the satellite cell comprises: exchanging part or all of the random access-related message with the satellite cell through an interface between base stations. Claim 14 delete Claim 15 A device for random access comprising a memory and a processor, wherein the memory is configured to store a computer program and the processor is configured to perform the method for random access of claim 1. Claim 16 An apparatus for random access according to claim 15, characterized in that the random access-related message comprises at least one of Msg2 and Msg4 of 4-stage contention-based random access, or MsgB of 2-stage contention-based random access, or Msg0 and Msg2 of 4-stage contention-free random access. Claim 17 delete Claim 18 In paragraph 15, the indication information included in the random access-related message comprises: indication information added to the Media Access Control (MAC) subheader of the Random Access Response Media Access Control Protocol Data Unit (RAR MAC PDU) corresponding to Msg2 of the 4-stage contention-based random access; indication information added to the payload portion of the RAR MAC PDU corresponding to Msg2 of the 4-stage contention-based random access; indication information added to Msg 4 of the 4-stage contention-based random access; the indication information added to the MAC subheader of the RAR MAC PDU corresponding to Msg2 of the 4-stage contention-based random access and the indication information added to Msg4 of the 4-stage contention-based random access; the indication information added to the payload portion of the RAR MAC PDU corresponding to Msg2 of the 4-stage contention-based random access and the indication information added to Msg4 of the 4-stage contention-based random access; Marking information added to the MAC subheader of a RAR MAC PDU corresponding to MsgB of 2-stage contention-based random access; marking information added to the payload portion of a RAR MAC PDU corresponding to MsgB of 2-stage contention-based random access; marking information added to Msg0 of 4-stage contention-free random access; marking information added to the MAC subheader of a RAR MAC PDU corresponding to Msg2 of 4-stage contention-free random access; marking information added to the payload portion of a RAR MAC PDU corresponding to Msg2 of 4-stage contention-free random access; the marking information added to Msg0 of 4-stage contention-free random access and the marking information added to the MAC subheader of a RAR MAC PDU corresponding to Msg2 of 4-stage contention-free random access; The above indication information added to Msg0 of the above 4-stage contention-free random access and the above indication information added to the payload portion of the RAR MAC PDU corresponding to Msg2 of the above 4-stage contention-free random access;A device for random access characterized by including any one of the following.; Claim 19 A device for random access applied to a satellite cell, comprising a memory and a processor, wherein the memory is configured to store a computer program and the processor is configured to perform the method for random access of claim 8. Claim 20 A device for random access applied to a ground cell, comprising a memory and a processor, wherein the memory is configured to store a computer program and the processor is configured to perform the method for random access of claim 12. 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