Access method and device, communication equipment, communication system and storage medium

Abstract

The embodiment of the invention provides an access method and device, communication equipment, a communication system and a storage medium. The access method comprises: a terminal receiving first information of a second cell from a first cell, the second cell having overlapping coverage with the first cell, or the second cell being adjacent to the first cell in coverage; the first information is used for the terminal to access the second cell; the second cell is a cell in a dormant state, or the second cell does not send at least one of the following contents: a synchronization signal broadcast channel block SSB; a system information block SIB; and paging the message.

Description

Access method and device, communication equipment, communication system and storage medium Technical Field

[0001] The present disclosure relates to the field of communication technologies, and in particular to an access method and apparatus, a communication device, a communication system, and a storage medium. Background Art

[0002] With the development of communication technology, the concept of network energy conservation has been proposed. Network energy conservation can achieve environmental protection. However, how to achieve network energy conservation while ensuring the wireless communication quality of devices is also a challenge that needs to be addressed.

[0003] Summary of the Invention

[0004] With the development of technology, the successful access of devices in the context of network energy saving is proposed.

[0005] Embodiments of the present disclosure provide an access method and apparatus, a communication device, and a storage medium.

[0006] According to a first aspect of an embodiment of the present disclosure, an access method is provided, including:

[0007] The terminal receives first information of a second cell from a first cell, where the second cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell; the first information is used by the terminal to access the second cell; and the second cell does not send at least one of the following:

[0008] Synchronization Signal / PBCH Block (SSB);

[0009] System Information Block (SIB);

[0010] Paging message.

[0011] According to a second aspect of an embodiment of the present disclosure, an access method is provided, wherein the method of the access network device includes:

[0012] The access network device sends first information in a first cell or a second cell, where the first information is used for the terminal to access the second cell; the second cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell; the second cell is a cell in a dormant state, or the cell does not send at least one of the following:

[0013] SSB;

[0014] One or more SIBs;

[0015] Paging message.

[0016] According to a third aspect of an embodiment of the present disclosure, a terminal is provided, wherein the terminal includes:

[0017] The receiving module is configured to receive first information of a second cell from a first cell, wherein the second cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell; the first information is used for the terminal to access the second cell; and the second cell does not send at least one of the following:

[0018] SSB;

[0019] SIB;

[0020] Paging message.

[0021] According to a fourth aspect of an embodiment of the present disclosure, an access network device is provided, the access network device including:

[0022] The sending module is configured to send first information in the first cell or the second cell, wherein the first information is used for the terminal to access the second cell; the second cell is a cell in a dormant state, or the cell does not send at least one of the following:

[0023] Synchronization signal broadcast channel block SSB;

[0024] One or more system information blocks (SIBs);

[0025] paging messages;

[0026] The cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell;

[0027] According to a fifth aspect of an embodiment of the present disclosure, an access method is provided, comprising:

[0028] The terminal executes the access method provided by any technical solution of the first aspect;

[0029] The access network device executes the access method provided by any technical solution of the second aspect.

[0030] According to the sixth aspect of an embodiment of the present disclosure, a communication system is provided, wherein the communication system includes a terminal and an access network device; the terminal is configured to provide an access method according to any technical aspect of the first aspect, and the access network device is configured to implement the access method of any technical solution of the second aspect.

[0031] According to a seventh aspect of an embodiment of the present disclosure, a communication device is provided, wherein the communication device includes:

[0032] one or more processors;

[0033] The processor is used to call instructions to enable the communication device to execute the access method provided by the first aspect and / or the second aspect.

[0034] According to an eighth aspect of an embodiment of the present disclosure, a storage medium is provided, wherein the storage medium stores instructions, which, when the instructions are executed on a communication device, enable the communication device to execute the access method provided by the first aspect and / or the second aspect.

[0035] The technical solution provided by the embodiment of the present disclosure is that the first cell sends the first information to assist the terminal in accessing the second cell that does not send SSB, SIB and / or paging messages. On the one hand, it achieves energy saving of the second cell, and on the other hand, it enables the terminal to successfully access the second cell with the assistance of the first cell, thereby ensuring the access success rate of the second cell.

[0036] It should be understood that the foregoing general description and the following detailed description are merely exemplary and explanatory and are not restrictive of the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the embodiments of the present disclosure.

[0038] FIG1A is a schematic diagram showing an architecture of a communication system according to an exemplary embodiment;

[0039] FIG1B is a schematic diagram of a first cell and a second cell;

[0040] FIG2 is a schematic diagram showing a flow chart of an access method according to an exemplary embodiment;

[0041] FIG3 is a schematic diagram showing a flow chart of an access method according to an exemplary embodiment;

[0042] FIG4 is a schematic diagram showing a flow chart of an access method according to an exemplary embodiment;

[0043] FIG5 is a schematic diagram showing a flow chart of an access method according to an exemplary embodiment;

[0044] FIG6A is a schematic diagram showing a flow chart of a four-step random access process according to an exemplary embodiment;

[0045] FIG6B is a schematic diagram showing a flow chart of a two-step random access process according to an exemplary embodiment;

[0046] FIG7A is a schematic diagram showing a PDU header according to an exemplary embodiment;

[0047] FIG7B is a schematic diagram showing a PDU header according to an exemplary embodiment;

[0048] FIG7C is a schematic diagram showing a PDU header according to an exemplary embodiment;

[0049] FIG7D is a schematic diagram showing a PDU header according to an exemplary embodiment;

[0050] FIG7E is a schematic diagram showing a PDU subheader according to an exemplary embodiment;

[0051] FIG7F is a schematic diagram showing a random access response according to an exemplary embodiment;

[0052] FIG7G is a schematic diagram showing a PDU subheader according to an exemplary embodiment;

[0053] FIG7H is a schematic diagram showing a PDU subheader according to an exemplary embodiment;

[0054] FIG8A is a schematic diagram showing a flow chart of an access method according to an exemplary embodiment;

[0055] FIG8B is a schematic diagram showing a flow chart of an access method according to an exemplary embodiment;

[0056] FIG9A is a schematic structural diagram of a terminal according to an exemplary embodiment;

[0057] FIG9B is a schematic structural diagram of an access network device according to an exemplary embodiment;

[0058] FIG9C is a schematic structural diagram of an access network device according to an exemplary embodiment;

[0059] FIG10A is a schematic structural diagram of a terminal according to an exemplary embodiment;

[0060] Fig. 10B is a schematic structural diagram of a communication device according to an exemplary embodiment. DETAILED DESCRIPTION

[0061] Embodiments of the present disclosure provide an access method and apparatus, a communication device, a communication system, and a storage medium.

[0062] In a first aspect, an embodiment of the present disclosure provides an access method, wherein the method includes: a terminal receiving first information of a second cell from a first cell, wherein the second cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell; the first information is used by the terminal to access the second cell; and the second cell does not send at least one of the following:

[0063] SSB;

[0064] One or more SIBs;

[0065] Paging message.

[0066] Based on the above solution, the terminal receives first information from the first cell that can be used by the terminal to access the second cell. Because the second cell does not send at least one of the SSB, SIB, and / or paging message, network energy saving is achieved in the second cell, and the terminal successfully accesses the second cell with the assistance of the first cell.

[0067] In combination with some embodiments of the first aspect, the second cell does not send SSB, SIB and paging messages.

[0068] Based on the above solution, the second cell is further specified.

[0069] In conjunction with some embodiments of the first aspect, the first cell sends one or more of the following:

[0070] SSB;

[0071] SIB;

[0072] Paging message.

[0073] In conjunction with some embodiments of the first aspect, the first information includes at least one of the following:

[0074] an index of the second cell;

[0075] a cell identifier of the second cell;

[0076] The beam information of the second cell is used to indicate whether the second cell uses beam communication and / or indicate the beam configuration of the beam communication of the second cell;

[0077] Frequency information, used to indicate the carrier frequency used by the second cell;

[0078] Slice information, used to indicate whether the second cell supports network slicing and / or an identifier of the supported network slice;

[0079] access configuration, used by the terminal to determine whether to access the second cell;

[0080] coverage information of the second cell;

[0081] Reference information, used to indicate whether the terminal can access the second cell;

[0082] signal information, used to indicate a reference signal related to the second cell;

[0083] Timing information is used to indicate the association relationship between the downlink timing of the first cell and the second cell.

[0084] Based on the above embodiment, the first information can provide various information required for accessing the second cell, thereby achieving access to the second cell simply and flexibly.

[0085] In conjunction with some embodiments of the first aspect, the method further includes:

[0086] When the conditions for accessing the second cell are met, a first message (Message 1, Msg1) is sent to the first cell or the second cell, where Msg1 is used to request uplink scheduling.

[0087] Based on the above solution, when the conditions for accessing the second cell are met, the terminal may send Msg1 to the first cell or the second cell, thereby starting a process of the terminal randomly accessing the second cell.

[0088] In conjunction with some embodiments of the first aspect, the method further includes:

[0089] The terminal receives a second message (Message 2, Msg2) from the first cell or the second cell, where Msg2 is a random access response, and the random access response carries an uplink grant.

[0090] Based on the above solution, the random access response can be sent by the first cell or the second cell. In this way, the cell for sending the second message can be flexibly selected according to the busyness of the first cell and the capability of the second cell.

[0091] In conjunction with some embodiments of the first aspect, information content of Msg2 sent by the first cell for the terminal to access the second cell is different from information content of Msg2 sent by the first cell for the terminal to access the first cell;

[0092] or,

[0093] The scrambling sequence of Msg2 sent by the first cell for the terminal to access the second cell is different from the scrambling sequence of Msg2 sent by the first cell for the terminal to access the first cell.

[0094] Based on the above solution, Msg2 is sent by the first cell, and the random access response of the first cell can be distinguished through the message content and / or scrambling sequence of Msg2, thereby reducing access confusion of the terminal.

[0095] In combination with some embodiments of the first aspect, the scrambling sequence of Msg2 for accessing the second cell includes: a radio access-radio network temporary identifier RA-RNTI associated with the second cell;

[0096] And / or, the scrambling sequence of Msg2 for accessing the first cell includes: the RA-RNTI associated with the first cell.

[0097] Based on the above scheme, the scrambling sequence is the RA-RNTI corresponding to the first cell or the second cell. In this way, without adding a dedicated scrambling sequence, RA-RNTI multiplexing is achieved, and the RA-RNTI corresponding to the first cell and the second cell is used to distinguish Msg2 sent by the first cell for access to different cells.

[0098] In combination with some embodiments of the first aspect, the RA-RNTI associated with the second cell is determined according to a cell identifier of the second cell.

[0099] Based on the above solution, the RA-RNTI associated with the second cell is related to the identifier of the second cell, so when a first cell simultaneously assists terminals of multiple adjacent second cells to access, the RA-RNTI can also be well distinguished.

[0100] In conjunction with some embodiments of the first aspect, the different message content between Msg2 sent by the first cell for the terminal to access the second cell and Msg2 sent by the first cell for the terminal to access the first cell includes one of the following:

[0101] Cell indication;

[0102] Timing information.

[0103] Based on the above solution, the cell indication can further clearly indicate which second cell the current Msg2 is for. The timing information can be used for synchronization between the terminal and the second cell, thereby improving the terminal's ability to successfully access the intended second cell.

[0104] In conjunction with some embodiments of the first aspect, the cell indication is carried in at least one of the following:

[0105] Msg2 media access control MAC protocol data packet PDU header;

[0106] Msg2 PDU subheader; MAC PDU includes sub-PDU; wherein, PDU subheader is the head of sub-PDU;

[0107] Random access response RAR of the MAC sub-PDU of Msg2.

[0108] Based on the above solution, the cell indication in Msg2 can be carried in any of the above ways, so it can be flexibly set and selected as needed.

[0109] In combination with some embodiments of the first aspect, the cell indication is carried in a reserved R field of a PDU header of Msg2;

[0110] or,

[0111] The cell indication is carried in the R field and the fallback indication BI field of the PDU header of Msg2.

[0112] The above solution provides a specific implementation method for carrying the cell indication.

[0113] In combination with some embodiments of the first aspect, the BI field includes a first bit and a second bit; wherein the first bit is used with the R field to carry a cell indication; and the second bit is used to indicate a BI index value.

[0114] Based on the above solution, if the BI field is used to carry the cell indication, the bit corresponding to the BI field is divided into a first bit and a second bit, thereby realizing the multiplexing of the BI field to carry the cell indication and the BI value.

[0115] In conjunction with some embodiments of the first aspect, the second bit is used to indicate one of the following:

[0116] BI index values ​​in the first range; BI index values ​​in the second range that are even numbers;

[0117] Even-numbered BI index values ​​in the second range;

[0118] Odd-numbered BI index values ​​in the second range;

[0119] The first range is a subset of the second range, and the first range contains a continuous distribution of BI index values.

[0120] The above solution provides a specific implementation method for indicating BI index values ​​after the number of bits specifically indicating BI index values ​​in the BI domain is reduced, which is characterized by simple implementation. Furthermore, when the second bit indicates a BI index value within the second range, although the number of bits indicating the BI index value is reduced, the range of the indicated BI index value is not reduced or is reduced only slightly.

[0121] In combination with some embodiments of the first aspect, a bit value of the second bit points to two BI index values ​​distributed adjacently within the second range, and the BI corresponding to the second bit is: the average value of the BI indicated by the two BI index values ​​distributed adjacently indicated by the second bit, the average value rounded up, or the average value rounded down.

[0122] Based on the above solution, this method can also minimize or minimize the range of the indicated BI index value while reducing the number of bits indicating the BI index value.

[0123] In conjunction with some embodiments of the first aspect, the timing information carried by the second message sent by the first cell for the terminal to access the first cell is: a first timing advance;

[0124] The timing information carried in the second message sent by the first cell for the terminal to access the second cell is: the difference between the first timing advance and the second timing advance;

[0125] A first timing advance, used for communication between the terminal and the first cell;

[0126] The second timing advance is used for communication between the terminal and the second cell.

[0127] Based on the above solution, if the relative positions between the terminal and the center points of the first cell and the second cell are different, then the timing advances for communication between the terminal and the cells will be different. In the disclosed embodiment, the timing information is directly used in the second message to indicate the second timing advance to the terminal based on the first timing advance of the first cell with a smaller bit overhead.

[0128] In conjunction with some embodiments of the first aspect, the method further includes:

[0129] The terminal sends a third message (Message 3, Msg3) to the first cell or the second cell, where Msg3 is used to request access to the second cell.

[0130] Based on the above solution, after receiving the second message addressed to itself, the terminal will send Msg3 to the first cell or the second cell, thereby entering the process of formally accessing the second cell, ensuring that the terminal successfully accesses the second cell.

[0131] In conjunction with some embodiments of the first aspect, the method further includes:

[0132] The terminal receives a fourth message (Message 4, Msg4) sent by the first cell or the second cell, where Msg4 is used by the terminal to confirm that it has accessed the second cell.

[0133] Based on the above solution, the terminal successfully receives Msg4 from the first cell and / or the second cell, indicating that the terminal successfully accesses the second cell.

[0134] A second aspect provides an access method, performed by an access network device of a first cell or a second cell, where the first cell is a neighboring cell of the second cell; the method includes:

[0135] Sending first information, where the first information is used for the terminal to access a second cell; the second cell is a cell in a dormant state, or the second cell does not send at least one of the following:

[0136] Synchronization signal broadcast channel block SSB;

[0137] System Information Block SIB;

[0138] paging messages;

[0139] The second cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell;

[0140] In conjunction with some embodiments of the second aspect, the first information includes at least one of the following:

[0141] an index of the second cell;

[0142] a cell identifier of the second cell;

[0143] The beam information of the second cell is used to indicate whether the second cell uses beam communication and / or indicate the beam configuration of the beam communication of the second cell;

[0144] Frequency information, used to indicate the carrier frequency used by the second cell;

[0145] Slice information, used to indicate whether the second cell supports network slicing and / or an identifier of the supported network slice;

[0146] access configuration, used by the terminal to determine whether to access the second cell;

[0147] coverage information of the second cell;

[0148] Reference information, used to indicate whether the terminal can access the second cell;

[0149] signal information, used to indicate reference signal timing information related to the second cell;

[0150] Timing information is used to indicate the association relationship between the downlink timing of the first cell and the second cell.

[0151] In conjunction with some embodiments of the second aspect, the method further includes:

[0152] A first message is received, where the first message is used to request uplink scheduling of the second cell when a condition for accessing the second cell is met.

[0153] In conjunction with some embodiments of the second aspect, the method further includes:

[0154] A first message Msg1 is received, where the Msg1 is used to request uplink scheduling of the second cell when a condition for accessing the second cell is met.

[0155] In conjunction with some embodiments of the second aspect, the method further includes:

[0156] A second message Msg2 is sent, where the Msg2 is a random access response, and the random access response carries an uplink grant.

[0157] In combination with some embodiments of the second aspect, information content of the Msg2 sent by the first cell for the terminal to access the second cell is different from information content of the Msg2 sent by the first cell for the terminal to access the first cell;

[0158] or,

[0159] The scrambling sequence of the Msg2 sent by the first cell for the terminal to access the second cell is different from the scrambling sequence of the Msg2 sent by the first cell for the terminal to access the first cell.

[0160] In combination with some embodiments of the second aspect, the scrambling sequence of the Msg2 for accessing the second cell includes: a radio access-radio network temporary identifier RA-RNTI associated with the second cell; and / or,

[0161] The scrambling sequence of Msg2 for accessing the first cell includes: the RA-RNTI associated with the first cell.

[0162] In combination with some embodiments of the second aspect, the RA-RNTI associated with the second cell is determined according to a cell identifier of the second cell.

[0163] In combination with some embodiments of the second aspect, the second message sent by the first cell for the terminal to access the second cell, and the second message sent by the first cell for the terminal to access the first cell, different message content includes one of the following:

[0164] Cell indication;

[0165] Timing information.

[0166] In conjunction with some embodiments of the second aspect, the cell indication is carried in at least one of the following:

[0167] The media access control MAC protocol data packet PDU header of the Msg2;

[0168] The PDU subheader of the Msg2; the MAC PDU includes a sub-PDU; wherein the PDU subheader is the head of the sub-PDU;

[0169] The random access response RAR of the MAC sub-PDU of the Msg2.

[0170] In combination with some embodiments of the second aspect, the cell indication is carried in a reserved R field of a PDU header of the Msg2;

[0171] or,

[0172] The cell indication is carried in the R field and the fallback indication BI field of the PDU header of the Msg2.

[0173] In combination with some embodiments of the second aspect, the BI field includes a first bit and a second bit; wherein the first bit is used with the R field to carry the cell indication; and the second bit is used to indicate a BI index value.

[0174] In conjunction with some embodiments of the second aspect, the second bit is used to indicate one of the following:

[0175] BI index value of the first range;

[0176] Even-numbered BI index values ​​in the second range;

[0177] An odd-numbered BI index value within the second range;

[0178] Among them, the first range is a subset of the second range, and the BI index values ​​contained in the first range are continuously distributed.

[0179] In combination with some embodiments of the second aspect, a bit value of the second bit points to two BI index values ​​distributed adjacently within the second range, and the BI corresponding to the second bit is: the average value of the BI indicated by the two BI index values ​​distributed adjacently indicated by the second bit, the average value rounded up, or the average value rounded down.

[0180] With reference to some embodiments of the second aspect, the timing information carried by the second message sent by the first cell for the terminal to access the first cell is: a first timing advance;

[0181] The timing information carried by the second message sent by the first cell for the terminal to access the second cell is: the difference between the first timing advance and the second timing advance;

[0182] The first timing advance is used for communication between the terminal and the first cell;

[0183] The second timing advance is used for communication between the terminal and the second cell.

[0184] In conjunction with some embodiments of the second aspect, the method further includes:

[0185] A third message Msg3 is received, where the Msg3 is used by the second cell to request access to the second cell.

[0186] In conjunction with some embodiments of the second aspect, the method further includes:

[0187] The terminal receives a fourth message Msg4 sent by the first cell or the second cell, wherein the Msg4 is used to confirm that the terminal has accessed the second cell.

[0188] A third aspect provides a terminal, wherein the terminal includes:

[0189] A receiving module is configured to receive first information of a second cell from a first cell, wherein the second cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell; the first information is used for the terminal to access the second cell; and the second cell does not send at least one of the following:

[0190] Synchronization signal broadcast channel block SSB;

[0191] System Information Block SIB;

[0192] Paging message.

[0193] A fourth aspect provides an access network device, the access network device comprising:

[0194] The sending module is configured to send first information in the first cell or the second cell, wherein the first information is used for the terminal to access the second cell; the second cell is a cell in a dormant state, or the second cell does not send at least one of the following:

[0195] Synchronization signal broadcast channel block SSB;

[0196] One or more system information blocks (SIBs);

[0197] paging messages;

[0198] The second cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell.

[0199] In a fifth aspect, an access method is provided, comprising:

[0200] The terminal executes the access method provided by any technical solution of the first aspect;

[0201] The access network device executes the access method provided by any technical solution of the second aspect.

[0202] In the sixth aspect, a communication system is provided, wherein the communication system includes a terminal and an access network device; the terminal is configured to provide an access method according to any technical aspect of the first aspect, and the access network device is configured to implement the access method of any technical solution of the second aspect.

[0203] In a seventh aspect, an embodiment of the present disclosure provides a communication device, the communication device including:

[0204] one or more processors;

[0205] The processor is used to call instructions to enable the communication device to execute the access method described in the optional implementation manner of the first aspect, the second aspect or the third aspect.

[0206] In an eighth aspect, an embodiment of the present disclosure provides a storage medium, wherein the storage medium stores instructions, which, when the instructions are executed on a communication device, enable the communication device to execute the access method described in the optional implementation of the first aspect and / or the second aspect.

[0207] In a ninth aspect, an embodiment of the present disclosure provides a program product. When the program product is executed by a communication device, the communication device executes the access method described in the optional implementation of the first aspect and / or the second aspect.

[0208] In a tenth aspect, an embodiment of the present disclosure provides a computer program, which, when executed on a computer, enables the computer to execute the access method described in the optional implementation of the first aspect and / or the second aspect.

[0209] It is understandable that the above-mentioned terminals, access network devices, communication devices, communication systems, storage media, program products, and computer programs are all used to execute the methods provided by the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding methods and will not be repeated here.

[0210] The present disclosure provides an access method and apparatus, a communication device, a communication system, and a storage medium. In some embodiments, the terms "access method" and "information processing method" are interchangeable; the terms "information indicating device" and "information processing device" are interchangeable; and the terms "communication system" and "information processing system" are interchangeable.

[0211] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0212] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0213] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0214] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when articles such as "a", "an", "the" in English are used in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0215] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0216] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0217] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "in one case A, in another case B," or "in one case A, in another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The same applies when there are more branches such as A, B, and C.

[0218] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0219] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0220] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0221] In some embodiments, terms such as "...", "determine...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0222] In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0223] In some embodiments, devices, etc. can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as "device", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", and "subject" can be used interchangeably.

[0224] In some embodiments, "network" can be interpreted as devices included in the network (eg, access network equipment, core network equipment, etc.).

[0225] In some embodiments, the terms "access network device (AN device)", "radio access network device (RAN device)", "base station (BS)", "radio base station" "fixed station", "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "antenna panel", "antenna array", "base station (cell)", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving base station", "carrier", "component carrier", "bandwidth part (BWP)" and the like may be used interchangeably.

[0226] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc. can be used interchangeably.

[0227] In some embodiments, the access network device, the core network device, or the network device can be replaced by a terminal. For example, the various embodiments of the present disclosure can also be applied to a structure in which the communication between the access network device, the core network device, or the network device and the terminal is replaced by communication between multiple terminals (for example, device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it is also possible to set the structure in which the terminal has all or part of the functions of the access network device. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can be replaced by side channels, and uplinks, downlinks, etc. can be replaced by side links.

[0228] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, the core network device, or the network device may have a structure that has all or part of the functions of the terminal.

[0229] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0230] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0231] In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns can also be implemented as an independent embodiment.

[0232] FIG1A is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure.

[0233] As shown in FIG1A , a communication system 100 includes a terminal 101 , an access network device 102 , and a core network device 103 .

[0234] In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited thereto.

[0235] In some embodiments, the access network device 102 can be, for example, a node or device that accesses the terminal to the wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a Wi-Fi system, but is not limited thereto.

[0236] In some embodiments, the technical solution of the present disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure can be transformed into internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0237] In some embodiments, the access network device can be composed of a centralized unit (CU) and a distributed unit (DU), where the CU can also be called a control unit. The CU-DU structure can be used to split the protocol layer of the access network device, with the functions of some protocol layers centrally controlled by the CU, and the functions of the remaining part or all of the protocol layers distributed in the DU, which is centrally controlled by the CU, but is not limited to this.

[0238] In some embodiments, the core network device 103 may be a single device including the first network element 1031, or may be multiple devices or a group of devices, each including the first network element 1031. A network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0239] In some embodiments, the first network element 1031 is, for example, an access and mobility management function (AMF).

[0240] In some embodiments, the first network element 1031 is, for example, a Mobility Management Entity (MME).

[0241] In some embodiments, the first network element 1031 is used for access and mobility management, such as registration management, connection management, and mobility management, etc., but the name is not limited thereto.

[0242] In some embodiments, the first network element 1031 may be a network element independent of the core network device.

[0243] In some embodiments, the core network may further include a second network element, etc. The second network element may include: User Data Management (UDM), etc.

[0244] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution provided by the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems.

[0245] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1A , or a portion thereof, but are not limited thereto. The entities shown in FIG1A are illustrative only. The communication system may include all or part of the entities shown in FIG1A , or may include other entities other than those shown in FIG1A . The number and form of the entities may be arbitrary. The connection relationship between the entities is illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0246] The embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other access methods, and next-generation systems based on and extending these. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0247] In order to reduce network energy consumption, network energy saving was initiated, and therefore energy-saving cells were introduced in addition to conventional cells.

[0248] For example, the terminal may enter a Network Energy Saving (NES) mode.

[0249] Discontinuous Reception (DRX) / discontinuous transmission (DTX) mode, in which the cell periodically stops sending and / or receiving at certain intervals.

[0250] SSB / SIB1-less cells;

[0251] Antenna port adaptation;

[0252] Physical Downlink Shared Channel (PDSCH) transmission power adaptation.

[0253] As shown in Figure 1B, SSB / SIB1-less cells do not transmit SSB, SIB1, other SIBs, and / or paging messages. However, RACH procedures can be initiated to SSB / SIB1-less cells. SSB / SIB1-less cells do not transmit SSB, and SIB1 is configured by broadcasting through an associated cell.

[0254] The following solutions are provided to ensure successful terminal access in energy-saving cells:

[0255] FIG2 is an interactive diagram of an access method according to an embodiment of the present disclosure. As shown in FIG2 , the embodiment of the present disclosure relates to an access method for a communication system 100, the method comprising:

[0256] S2101: The first cell sends the first information.

[0257] In some embodiments, the first cell is a regular cell.

[0258] In some embodiments, the first cell is a cell that sends an SSB, an SIB, and / or a paging message. The paging message may include a core network (CN) paging message and / or a radio access network (RAN) paging message.

[0259] In some embodiments, the first cell is a neighboring cell of the second cell.

[0260] In some other embodiments, the coverage of the first cell and the second cell at least partially overlap.

[0261] In some embodiments, the first cell may be the cell in which the terminal is currently camping, and the second cell may be the cell in which the terminal is remaining camping.

[0262] In some examples, the first cell may be the current serving cell of the terminal, and the second cell may be the next serving cell of the terminal.

[0263] In some embodiments, the first cell may be a cell that the terminal has already accessed, and the second cell may be a target cell to be accessed by the terminal.

[0264] In some embodiments, the first cell is a macro cell, a 4G cell, a 5G cell, or the like.

[0265] In some embodiments, the second cell may be an energy-saving cell.

[0266] In some embodiments, the first cell and the second cell have overlapping coverage.

[0267] In some embodiments, the coverage of the first cell and the second cell are adjacent.

[0268] In some embodiments, the second cell and the first cell are neighboring cells.

[0269] In some embodiments, the second cell may include but is not limited to at least one of the following:

[0270] SSB / SIB1-less cell, illustratively, such an energy-saving cell is a cell that does not send SSB, SIB and / or paging cells;

[0271] Discontinuous Reception (DRX) cell;

[0272] Discontinuous transmission (DTX) cell;

[0273] Antenna port adaptive cell;

[0274] Physical Downlink Shared Channel (PDSCH) transmission power consumption adaptive cell;

[0275] A dormant cell is a cell that is in a dormant state.

[0276] In some embodiments, the second cell does not send SSB, SIB and paging messages.

[0277] In some embodiments, the second cell is a cell that does not send SSB, SIB and / or paging messages. Exemplarily, the SIB may include at least SIB1.

[0278] In some embodiments, the SIB sent by the second cell may be SIB2, SIB3, or SIB4, etc. That is, the second cell may be an SSB / SIB1-Less cell.

[0279] In some embodiments, the second cell does not send SSB, SIB1 and / or paging messages.

[0280] In some embodiments, the second cell may be in a dormant state. The power consumption of the second cell in the dormant state is lower than that of the second cell in the active state. After the second cell exits the dormant state and enters the active state, it can provide communication services to the terminal. Alternatively, the dormant state of the second cell may reduce the transmission of some signals, making it impossible for the terminal to directly discover the second cell based on the signals transmitted by the second cell. However, the second cell can still provide communication services to the terminal that has accessed the second cell.

[0281] Exemplarily, when the second cell is in a dormant state, no SSB, SIB1 and / or paging message is sent.

[0282] In some embodiments, the first cell sends one or more of the following:

[0283] SSB;

[0284] SIB;

[0285] Paging message.

[0286] In some embodiments, the first cell broadcasts, multicasts, or unicasts the first information.

[0287] In some embodiments, the first information is used for the terminal to access the second cell.

[0288] In some embodiments, the first information is used by the terminal to access the second cell using a random access procedure.

[0289] The random access process may involve initial access of the terminal, random access during cell reselection of the terminal, and random access of the terminal during beam recovery and / or connection recovery.

[0290] In some embodiments, the random access process may include a two-step random access process. The two-step random access process may be shown in FIG6B , where a message (Msg) 0 is used to allocate a wireless access random access preamble, and the random access process is completed through messages A and B.

[0291] In some other embodiments, the random access process may include a four-step random access process. Figure 6A shows a four-step random access process.

[0292] In some embodiments, the random access procedure may include but is not limited to a contention-based random access procedure.

[0293] In some embodiments, the first cell broadcasts, multicasts, or unicasts the first information.

[0294] In some embodiments, the first cell sends the first information via an RRC message.

[0295] A terminal residing in the first cell or located in the overlapping coverage of the first cell and the second cell will receive the first information sent by the first cell.

[0296] In some embodiments, the first information includes at least one of the following:

[0297] an index of the second cell;

[0298] a cell identifier of the second cell;

[0299] The beam information of the second cell is used to indicate whether the second cell uses beam communication and / or indicate the beam configuration of the beam communication of the second cell;

[0300] Frequency information, used to indicate the carrier frequency used by the second cell;

[0301] Slice information, used to indicate whether the second cell supports network slicing and / or an identifier of the supported network slice;

[0302] access configuration, used by the terminal to determine whether to access the second cell;

[0303] coverage information of the second cell;

[0304] Reference information, used to indicate whether the terminal can access the second cell;

[0305] signal information, used to indicate a reference signal related to the second cell;

[0306] Timing information is used to indicate the association relationship between the downlink timing of the first cell and the second cell.

[0307] Secondary cells have cell identifiers (IDs), but cell IDs are typically quite long. Therefore, a shorter index can be used to refer to the secondary cells. For example, if there are M secondary cells surrounding a primary cell, the primary cell can number these M secondary cells to obtain their indexes. This reduces signaling overhead when the primary cell carries the index.

[0308] For example, the first cell may sequentially number a plurality of adjacent second cells, and the sequential numbering of the second cells may start from 1.

[0309] In some embodiments, in order to simplify the operation of the first cell, the first information may directly carry the cell identifier of the second cell.

[0310] In some embodiments, the cell identity may include but is not limited to at least one of the following:

[0311] Physical Cell Identifier / Identity (PCI), used for physical layer transmission;

[0312] Logical cell identifier (Cell Identifier / Identity), used for high-level transmission;

[0313] RAN area ID;

[0314] RAN Notification Area Code (RNAC);

[0315] Tracking Area Code (TAC);

[0316] System information area ID (eg, system information area identification).

[0317] Of course, the above are merely examples of cell identifications, and specific implementation is not limited to the above examples.

[0318] Beam information, indicating whether the second cell uses beam communication.

[0319] In some embodiments, the beam information may include an indicator that may be used to indicate whether the second cell uses beam communication.

[0320] In some embodiments, if the second cell does not use beam communication, the beam information may be defaulted, and the terminal may assume that the second cell does not use beam.

[0321] In other embodiments, if the second cell uses beam communication, the beam information includes beam configuration.

[0322] In some embodiments, the beam configuration may include, but is not limited to, at least one of the following:

[0323] Beam identification;

[0324] Beam direction;

[0325] Frequency domain resources of the beam;

[0326] Beam time domain resources, etc.

[0327] The number of beams of the second cell.

[0328] The beam configuration can be: periodic configuration, semi-persistent configuration and / or dynamic configuration.

[0329] Of course, the above is just an example of beam configuration.

[0330] In some embodiments, the frequency information may be used to indicate at least one of the following:

[0331] frequency layer of the second cell;

[0332] The frequency used by the second cell;

[0333] The frequency band used by the second cell;

[0334] Division of the bandwidth part (Band Wdith Part, BWP) of the second cell;

[0335] The system bandwidth of the second cell;

[0336] Downlink initial BWP. For example, different types of terminals can be configured with the same or different downlink initial BWPs. The downlink initial BWP can be used for initial access of the terminal.

[0337] Of course, the above is only an example of frequency information, and the specific implementation is not limited to the above example.

[0338] In some embodiments, the second cell may or may not support network slicing.

[0339] In some embodiments, if the second cell supports network slicing, the first information may include slicing information. If the second cell does not support network slicing, the first information does not include slicing information.

[0340] In some embodiments, the slicing information may include an indicator indicating whether the second cell supports network slicing, so that a terminal that wants to use network slicing to communicate can choose to access the second cell.

[0341] In some embodiments, the slice information may include an identifier of the network slice supported by the terminal, which may include but is not limited to at least one of the following:

[0342] Single Network Slice Selection Assistance Information (S-NSSAI);

[0343] Slice / Service Type;

[0344] Slice Differentiator

[0345] Network Slice Selection Assistance Information (NSSAI).

[0346] In some embodiments, in a scenario where the second cell does not support network slicing or the second cell will subsequently inform the terminal of the network slices it supports, the first information may default to slice information.

[0347] In some embodiments, the access configuration may indicate any configuration information related to accessing the second cell.

[0348] In some embodiments, the access configuration may include, but is not limited to, random access channel (RACH) related configuration.

[0349] The RACH-related configuration may indicate, but is not limited to, at least one of the following:

[0350] The time-frequency domain position of the RACH used for second cell access;

[0351] A random access preamble for accessing the second cell;

[0352] A correspondence between a random access preamble for accessing the second cell and the SSB of the first cell;

[0353] The correspondence between the RACH used for accessing the second cell and the SSB of the first cell;

[0354] The correspondence between the RACH used for second cell access and the beam of the second cell;

[0355] a correspondence between a random access preamble code used for accessing the second cell and a beam of the second cell;

[0356] The correspondence between the RACH used for accessing the second cell and the beam of the first cell;

[0357] A correspondence between a random access preamble for accessing the second cell and a beam of the first cell;

[0358] Conditions for initiating random access to the second cell.

[0359] In some embodiments, the time-frequency domain positions of the RACHs of the first cell and the second cell are different. In this way, it can be distinguished based on the RACH whether the terminal requests to access the first cell or the second cell.

[0360] In some embodiments, the random access preambles used to access the first cell and the second cell may be different. In this case, the terminal sends a first message to the first cell, and the first cell can distinguish whether the current terminal is requesting access to the first cell or the second cell based on the random access preamble carried in the first message.

[0361] For example, the SSB of the first cell can be used for beam transmission. If a correspondence is established between the random access preamble used for the second cell and the SSB of the first cell, the terminal can select the corresponding random access preamble to request random access based on the SSB of the first cell it monitors. In this case, upon receiving this random access preamble, the network device can estimate the terminal's location based on the correspondence between the random access preamble and the SSB of the first cell, combined with the beam direction of the SSB.

[0362] As another example, the beams in the correspondence between the RACH used for accessing the second cell and the beams of the second cell include, but are not limited to, the beam used by the first cell to transmit a reference signal and the serving beam used by the terminal to communicate with the first cell. In short, based on this correspondence, the terminal can select the corresponding RACH to initiate a random access request procedure.

[0363] In some embodiments, there is a correspondence between the random access preamble code used for accessing the second cell and the beam of the first cell. In this way, the terminal can select a suitable random access preamble code to initiate a random access process based on its own service beam or available beam in the first cell.

[0364] In some embodiments, the conditions for initiating random access to the second cell may include, but are not limited to, at least one of the following:

[0365] A measurement value of a reference signal of the first cell is less than a threshold value;

[0366] Entering the coverage area of ​​the second cell;

[0367] Entering the designated area of ​​the first cell;

[0368] A designated beam of a first cell is detected;

[0369] The service beam of the terminal is the designated beam.

[0370] In some embodiments, entering the designated range of the first cell may include: an overlapping range of the first cell and the second cell.

[0371] In other embodiments, if the designated beam is detected or the service beam is the designated beam, it means that the terminal has entered the coverage of the second cell.

[0372] In some embodiments, the coverage information can be used by the terminal to determine the coverage of the second cell. This makes it easier for the terminal to determine whether it is within the second cell, or whether it is located at the center or edge of the second cell.

[0373] The content indicated by the coverage information may specifically include but is not limited to at least one of the following:

[0374] indicating the coverage of the second cell;

[0375] indicating a coverage level of the second cell;

[0376] Indicates the maximum radiated power of the second cell;

[0377] Indicates the coverage difference of the second cell relative to the first cell.

[0378] Of course, the above is merely an example of the content indicated by the coverage information, and the specific implementation is not limited to the above example.

[0379] In some embodiments, the reference information may be used by the terminal to determine whether it can access the second cell, or whether the terminal is capable of accessing the second cell.

[0380] In some embodiments, the reference information may include: condition information indicating a condition for accessing the second cell.

[0381] The condition may limit the type of terminal accessing the second cell, the terminal location, the conditions that the terminal's measurement value of the reference signal of the first cell must meet, and / or the conditions that the terminal's measurement value of the reference signal of the second cell must meet.

[0382] In some cases, the second cell may only support access by certain types of terminals.

[0383] In some cases, the second cell only supports access by terminals located at specific locations to improve communication quality of terminals accessing the second cell.

[0384] In some embodiments, the terminal measures a reference signal of the first cell in a first cell. If it is detected that the measured value of the reference signal of the first cell decreases, the terminal may need to switch to a second cell to obtain communication services, or the second cell may need to assist the first cell in providing communication services to the terminal.

[0385] Exemplarily, the condition to be satisfied by the terminal's measurement value of the reference signal of the first cell may include:

[0386] A measurement value of a reference signal of the first cell by the terminal is less than or equal to a first threshold and greater than a second threshold, wherein the first threshold is greater than the second threshold.

[0387] In some embodiments, the reference information may also indicate a measurement quantity that meets a specific condition.

[0388] In some embodiments, the measurement may include but is not limited to at least one of the following:

[0389] Reference Signal Received Power (RSRP);

[0390] Reference signal reception quality (RSRQ);

[0391] Signal to Interference plus Noise Ratio (SINR).

[0392] In some embodiments, the reference signal of the first cell measured by the terminal includes but is not limited to at least one of the following:

[0393] SSB;

[0394] Channel State Information-Reference Signal (CSI-RS), etc.

[0395] In some embodiments, the second threshold may be a threshold at which the terminal switches to another regular cell. The first cell here is a regular cell. Regular cells may send SSBs, SIBs, and / or paging messages.

[0396] As another example, the condition to be satisfied by the terminal's measurement value of the reference signal of the second cell may include:

[0397] A measurement value of the reference signal of the second cell by the terminal is greater than a third threshold.

[0398] The reference signal of the second cell may include but is not limited to a CSI-RS, a demodulation reference signal and / or a phase tracking signal, etc.

[0399] The signal information may include: downlink reference signal information and / or uplink reference signal information.

[0400] In some embodiments, the downlink reference signal may include but is not limited to at least one of the following: CSI-RS, a demodulation reference signal and / or a phase tracking signal, a positioning reference signal, etc.

[0401] The uplink reference signal may include but is not limited to a positioning reference signal, etc.

[0402] In some embodiments, the signal information may also include a signal configuration.

[0403] In some embodiments, the signal information may indicate a DL signal set.

[0404] The DL signal set includes one or more DL signals, and these DL signals are related to the second cell.

[0405] For example, these DL signals may have information indicating the coverage of the second cell.

[0406] In some embodiments, the DL signal set may include, but is not limited to, a CSI-RS set and / or an SSB set.

[0407] The DL signal set may be used to determine whether the terminal enters the coverage of the second cell.

[0408] In some embodiments, the DL signal and the threshold value in the DL signal set may be used in combination for the terminal to determine whether it is within the coverage of the second cell, or for the first cell to determine that the terminal has entered the coverage of the second cell.

[0409] In some embodiments, the threshold value here may be based on a single beam or a beam group.

[0410] In other embodiments, the threshold value here may be based on a single DL signal or a DL signal group.

[0411] For example, the signal configuration may include:

[0412] Time-frequency resource information of the reference signal, indicating the time-frequency domain resources for sending the reference signal;

[0413] Transmission mode: whether the reference signal is sent using beamforming;

[0414] Indicates a downlink reference signal sent by the second cell and / or an uplink reference signal that the second cell requires the terminal to send.

[0415] In some embodiments, the downlink reference signal configured by the second cell is but not limited to a downlink wake-up signal (Downlink Wake Up Signal, DL-WUS) and / or an uplink wake-up signal (Uplink Wake Up Signal, UL-WUS).

[0416] Of course, the above are merely examples of signal information, and the specific implementation is not limited to the above examples.

[0417] In some embodiments, the timing information is used to determine the downlink timing and / or uplink timing of the second cell.

[0418] In some embodiments, the timing information may further indicate a DL timing offset between the first cell and the second cell.

[0419] In some embodiments, the timing information may also be used for the time advance (TA) of the terminal in the second cell.

[0420] In some embodiments, the timing information may also be used to determine a timing offset between a first TA and a second TA of a terminal in a first cell.

[0421] In some embodiments, the timing information may carry an initial TA, which may be used for a TA deviation in a subsequent second message, and together used to determine a second timing advance for communication of the terminal in the second cell.

[0422] It is worth noting that the above examples of the information content carried by the first information are not limited to the above examples in specific implementation.

[0423] S2102: Send the first message.

[0424] In some embodiments, the terminal sends a first message to the first cell or the second cell. The first message may be Msg1.

[0425] In some embodiments, the first message may be used by the terminal to request uplink scheduling.

[0426] In some embodiments, the uplink scheduling may include: scheduling an uplink grant (Uplink Grant) of a third message requesting the first cell or the second cell to perform a random access process.

[0427] In some embodiments, the first message may include a random access preamble.

[0428] In some embodiments, the first message is a message in which the terminal initiates a random access process for the second cell.

[0429] In some embodiments, the terminal may send the first message on the RACH requesting access to the second cell.

[0430] In some embodiments, when a condition for accessing the second cell is met, the terminal sends the first message.

[0431] In some embodiments, when a condition for accessing the second cell is met, the terminal sends a first message to the first cell or the second cell.

[0432] S2103: Send the second message.

[0433] In some embodiments, the first cell sends a second message to the terminal. The second message may be Msg2.

[0434] In some embodiments, the second cell sends a second message to the terminal.

[0435] In some embodiments, the first cell or the second cell receives one or more first messages and returns a second message to some or all terminals.

[0436] In some embodiments, the first cell or the second cell sends the second message based on the first message.

[0437] In some embodiments, the second message may include a Random Access Response (RAR).

[0438] In some embodiments, the second message may include a random access preamble identity (RAPID).

[0439] After receiving the second message, the terminal decodes the second message. If the second message carries the RAPID sent by the random access preamble sent by the terminal in the first message, it means that the second message is for the terminal itself.

[0440] In some embodiments, the second message may further include an uplink grant.

[0441] In some embodiments, the uplink grant may be an uplink grant of the first cell.

[0442] In other embodiments, the uplink grant may be an uplink grant of the second cell.

[0443] In some embodiments, the second message is sent by the first cell. In order to distinguish the second message for accessing the first cell and the second cell, the first cell distinguishes the second message by the message content and / or scrambling sequence.

[0444] In some embodiments, information content of the second message sent by the first cell for the terminal to access the second cell is different from information content of the second message sent by the first cell for the terminal to access the first cell.

[0445] In this manner, the terminal can determine, based on the message content, whether the second message is a random access procedure for the second cell or the first cell.

[0446] In some embodiments, the different message contents between the second message sent by the first cell for the terminal to access the second cell and the second message sent by the first cell for the terminal to access the first cell include one of the following: cell indication; timing information.

[0447] In some embodiments, the cell indication may indicate the first cell or the second cell.

[0448] In other embodiments, the cell indication may indicate a specific second cell.

[0449] For example, the cell indication may correspond to two bits, which may be used to indicate four second cells adjacent to the first cell. Different bit values ​​of the two bits may indicate different second cells.

[0450] In some embodiments, the timing information may indicate a timing advance, for example, a timing advance of the terminal in the second cell.

[0451] In some embodiments, the timing information may indicate a difference in timing advance between the terminal in the first cell and the terminal in the second cell.

[0452] In some embodiments, the cell indication is carried in a header of a media access control MAC protocol data packet PDU of the second message.

[0453] Figure 7A shows a Media Access Control (MAC) PDU, which can also be referred to as PDU.

[0454] A PDU may include one or more subheaders and padding. Note that padding is optional.

[0455] In some embodiments, the cell indication is carried in the reserved R field of the PDU header.

[0456] In some embodiments, some or all bits of the R field may be used to carry a cell indication.

[0457] As shown in FIG7A , the PDU header includes a 2-bit R field. As shown in FIG7A , the PDU header may include one or more bytes (Oclet, Oct). A byte may include 8 bits. The PDU header may also be referred to as a BI subheader.

[0458] The E in FIG. 7A represents an extension (E) field, which can be used to indicate whether there are other PDU subheaders in the PDU.

[0459] In FIG7A , T represents the type (Type, T) field, which can be used to indicate whether the subheader carries a BI field or a RAPID field. The BI field indicates a BI index value. The RAPID field indicates RAPID.

[0460] Both bits of the R field can be used to indicate the second cell. In this case, the 2-bit R field can not only indicate the second cell through the cell indication, but also indicate a specific second cell.

[0461] In some embodiments, a single bit in the R field of a PDU header can be used to carry a cell indication. This cell indication can be used to indicate whether the second message is intended for terminal access in the first cell or the second cell. Figure 7B illustrates a PDU header that uses a single bit in the R field to carry a cell indication. For example, a PDU header may also be referred to as a PDU header.

[0462] In some embodiments, two bits in the R field of the PDU header can be used to carry a cell indication. This cell indication can be used by a primary cell to indicate which of its two secondary cells a terminal is accessing. Figure 7C illustrates a PDU header in which both bits of the R field are used to carry a cell indication. In this case, the cell indication can carry a secondary cell index.

[0463] In some embodiments, the cell indication is carried in the R field and the fallback indication BI field of the PDU header.

[0464] The BI field is used to indicate the BI value.

[0465] In the embodiment of the present disclosure, some bits of the R field and the BI field can be used to carry the second cell. In this way, one first cell can assist a larger number of second cells to achieve random access of the terminal.

[0466] Exemplarily, the BI field has 4 bits, and one bit of the BI field is combined with the R field to carry a cell indication.

[0467] In this case, the remaining 3 bits of the BI field continue to indicate the BI value.

[0468] 7D is a schematic diagram of a PDU header in which both the two bits of the R field and the one bit of the BI field in the PDU header are used to carry a cell indication. In this case, the cell indication may carry an index of the second cell.

[0469] In some embodiments, the BI field includes a first bit and a second bit; wherein the first bit is used with the R field to carry a cell indication; and the second bit is used to indicate a BI index value.

[0470] In some embodiments, the BI index value indicates a BI value.

[0471] Table 1 below shows a correspondence between BI index values ​​and BI values.

[0472] Table 1

[0473] The second bit is used to indicate one of the following:

[0474] BI index value of the first range;

[0475] Even-numbered BI index values ​​in the second range;

[0476] Odd-numbered BI index values ​​in the second range;

[0477] The first range is a subset of the second range, and the first range contains a continuous distribution of BI index values.

[0478] In some embodiments, the second range may be 0 to 15 as shown in Table 1. The first range may be any sub-range of the first range. The first range may be any continuously distributed sub-range of the second range.

[0479] For example, the first range may be 0 to 7 as shown in Table 1.

[0480] In some embodiments, since the number of the second bit is less than the number of bits included in the entire BI field, in order not to narrow the range of the indicated BI value, the adjacent bit values ​​of the second bit can be mapped to BI index values ​​spaced within the first range.

[0481] For example, the eight bit values ​​of the three second bits can be mapped to the BI index values ​​0, 2, 4, 6, 8, and 16 in Table 1; or, the eight bit values ​​of the three second bits can be mapped to the BI index values ​​1, 3, 5, 7, and 15 in Table 1. In this way, although the number of indicated BI values ​​is reduced, the range of BI values ​​that can be indicated is not reduced or is reduced only slightly.

[0482] In some embodiments, a bit value of the second bit points to two BI index values ​​distributed adjacently within the second range, and the BI corresponding to the second bit is: the average value of the BI indicated by the two BI index values ​​distributed adjacently indicated by the second bit, the average value rounded up, or the average value rounded down.

[0483] For example, any of the eight bit values ​​of the three second bits can indicate two BI index values. For example, "000" maps to BI index values ​​0 and 1. In this case, a BI index value of 0 indicates a BI value of 5, and a BI index value of 1 indicates a BI value of 10. The average of 5 and 10 is 7.5, and the specific BI value indicated can be 7.5 rounded up or down. In this way, although the number of indicated BI values ​​is reduced, the range of BI values ​​that can be indicated is not reduced or is reduced only slightly.

[0484] In some embodiments, the cell indication is carried in the PDU subheader.

[0485] A PDU may include one or more sub-PDUs.

[0486] A sub-PDU may include a PDU sub-header.

[0487] FIG7G shows a non-extended PDU subheader which may include: an E field, a T field, and a RANPID field.

[0488] In some embodiments, the PDU subheader may be a subheader carrying a RAPID field. The cell indication may be carried in the RAPID field.

[0489] In other embodiments, the PDU subheader may be an extended PDU subheader.

[0490] The length of the extended PDU subheader can be extended from 1 byte to multiple bytes. As shown in FIG7E , the PDU subheader has two bytes (Oct), namely Oct1 and Oct2. In this case, the cell indication carries the index of the second cell, and the index of the second cell is carried by Oct2.

[0491] In some examples, since the PDU subheader is extended from one byte to two bytes, some bits are reserved in the PDU subheader to construct the R field.

[0492] In some embodiments, since a two-byte PDU subheader is introduced, the BI subheader is modified, and the BI subheader R field can be used to indicate whether the current PDU contains a two-byte PDU subheader, and / or, the R field of the BI subheader is used to indicate the location of the two-byte PDU subheader.

[0493] In some embodiments, a two-byte PDU subheader may be dedicated to random access of the second cell.

[0494] In some embodiments, if a PDU contains both a 1-byte PDU subheader and a 2-byte PDU subheader, the 1-byte PDU subheader is prioritized, and the starting position of the 2-byte PDU subheader is indicated by the R field of the BI subheader, thereby facilitating faster decoding by the terminal. For example, a terminal requesting access to a second cell can start decoding the PDU subheader from a specified position based on the position indicated by the R field of the BI subheader, thereby improving the decoding rate of the second message.

[0495] In some embodiments, the cell indication is carried in a PDU subheader of the second message; the MAC PDU includes a sub-PDU; wherein the PDU subheader is a header of the sub-PDU.

[0496] In some embodiments, the cell indicates a random access response RAR carried in a MAC sub-PDU of the second message.

[0497] In some embodiments, FIG7F shows a schematic diagram of RAR.

[0498] The RAR shown in FIG7F includes 8 bytes, and the cell indication is carried in the first byte.

[0499] In some embodiments, the TA command in FIG. 7F may carry information related to the timing advance of the terminal in the second cell, and may also carry one or more UL grants and / or TC-RNTIs.

[0500] In some embodiments, the scrambling sequence of the second message sent by the first cell for the terminal to access the second cell is different from the scrambling sequence of the second message sent by the first cell for the terminal to access the first cell.

[0501] In some embodiments, the second message sent by the first cell uses a different scrambling sequence, and the terminal will successfully descramble using a different descrambling sequence, so that the terminal can easily know whether it is a random access to the first cell or the second cell.

[0502] In some embodiments, the scrambling sequence may be a Radio Access-Temporary Identification of wireless network (RA-RNTI).

[0503] In some embodiments, the RA-RNTI corresponding to the first cell is different from the RA-RNTI corresponding to the second cell.

[0504] In some other embodiments, the first cell and the second cell calculate the RA-RNTI in different ways.

[0505] In some other embodiments, the first cell and the second cell calculate the RA-RNTI in the same manner but with different calculation parameters.

[0506] Exemplarily, the RA-RNTIs of the first cell and the second cell may be calculated using the following function:

[0507] RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14×80×8×2×ssb_less_cell_index

[0508] The value of ssb_less_cell_index is 0, indicating that the RA-RNTI corresponding to the random access opportunity (RO) of the first cell is calculated. The value of ssb_less_cell_index is 1, 2, ..., k, indicating the index of the second cell configured by the first cell, which is configured through the system broadcast of the first cell.

[0509] If the index of the configured second cell is not displayed, ssb_less_cell_index is the sequential index number of the configured SSB / SIB1-less cell list + 1.

[0510] s_id is the identifier of the first symbol of RO.

[0511] t_id is the identifier of the time slot where the RO is located.

[0512] ul_carrier_id is the uplink carrier identifier used for random access.

[0513] In some embodiments, the RAR further includes a TA field, and some bits of the TA field are also used to carry a cell indication.

[0514] In this case, the remaining bits of the TA field can be used to indicate the TA difference. This TA difference can be the difference between the timing advance of the terminal in the second cell and the timing advance of the terminal in the first cell, or the difference between the timing advance of the terminal in the second cell and the TA initially configured by the first cell via a broadcast message. This initially configured TA can be the TA of the first cell or the TA of the second cell.

[0515] Exemplarily, the timing information carried by the second message sent by the first cell for the terminal to access the first cell is: a first timing advance.

[0516] The timing information carried in the second message sent by the first cell for the terminal to access the second cell is: the difference between the first timing advance and the second timing advance;

[0517] A first timing advance, used for communication between the terminal and the first cell;

[0518] The second timing advance is used for communication between the terminal and the second cell.

[0519] In some embodiments, the second message may further include a temporary cell-radio network temporary identifier (TC-RNTI) allocated to the terminal.

[0520] The TC-RNTI may be used by the terminal in a subsequent random access process.

[0521] Of course, in other embodiments, if the terminal has already accessed the second cell and is accessing it again, the second message may not carry the TC-RNTI. At this time, the terminal has obtained the cell radio network temporary identifier (Cell-Radio Network Temporary Identifier, C-RNTI) allocated to the terminal by the second cell through historical access.

[0522] In some embodiments, the second message for accessing the second cell is sent by the first cell, and the TC-RNTI allocated to the terminal by the first cell needs to be different from the TC-RNTI and / or C-RNTI used by the terminal to access the first cell.

[0523] S2104: Send the third message.

[0524] In some embodiments, the terminal sends a third message to the first cell. The third message may be Msg3.

[0525] In some other embodiments, the terminal sends a third message to the second cell.

[0526] In some embodiments, the terminal sends the third message according to the uplink authorization.

[0527] Exemplarily, if the uplink authorization is an uplink authorization of the first cell, the third message is sent to the first cell.

[0528] As another example, if the uplink authorization is an uplink authorization of the second cell, the third message is sent to the second cell.

[0529] In some embodiments, the third message is a scheduled transmission.

[0530] In some embodiments, the third message is used by the terminal to request access to the second cell.

[0531] In some embodiments, the third message may carry the TC-RNTI or C-RNTI sent in the second message, thereby identifying the terminal.

[0532] S2105: Send the fourth message.

[0533] In some embodiments, the first cell sends a fourth message, which may be Msg4.

[0534] In some embodiments, the second cell sends the fourth message.

[0535] In some other embodiments, after receiving the third message, the first cell or the second cell sends a fourth message.

[0536] In some embodiments, the fourth message is used to indicate that the terminal has accessed the second cell.

[0537] In some embodiments, the fourth message may be used by the first cell or the second cell to resolve a conflict in which the terminal accesses the second cell based on a contention request.

[0538] In some embodiments, the fourth message may be a contention resolution message.

[0539] In some embodiments, after the fourth message is sent, the TC-RNTI of the connected terminal is determined as the C-RNTI, which can be used to identify the terminal.

[0540] As shown in FIG3 , an embodiment of the present disclosure provides an access method, which is executed by a terminal and includes:

[0541] S3101: Receive first information.

[0542] In some embodiments, the first information of the second cell is received from the first cell.

[0543] For the description of the first cell and the second cell, please refer to the embodiment shown in FIG2 .

[0544] For the relevant content of the first information here, please refer to the description of step S2102 of the embodiment shown in FIG. 2 .

[0545] S3102: Send the first message.

[0546] In some embodiments, the first message is sent to the first cell or the second cell.

[0547] S3102 herein may refer to step S2102 of the embodiment shown in FIG. 2 .

[0548] S3103: Receive the second message.

[0549] In some embodiments, the second message is received from the first cell or the second cell.

[0550] For the relevant description of the second message here, please refer to step S2103 of the embodiment shown in FIG. 2 .

[0551] S3104: Send the third message.

[0552] In some embodiments, the terminal sends a third message based on the second message.

[0553] In some embodiments, the terminal sends a third message to the first cell according to the second message.

[0554] In some other embodiments, the terminal sends a third message to the second cell according to the second message.

[0555] For the relevant description of the third message here, please refer to step S2104 of the embodiment shown in FIG. 2 .

[0556] S3105: Receive the fourth message.

[0557] In some embodiments, the terminal receives the fourth message in the first cell.

[0558] In some other embodiments, the terminal receives the fourth message in the second cell.

[0559] In some embodiments, the terminal may perform step S3101 alone. For example, the terminal receives the first information in the first cell, but the terminal may not ultimately initiate a random access process to the second cell, so steps S3102 to S3105 are optional steps.

[0560] In some embodiments, the terminal may perform steps S3101 to S3102. For example, the terminal receives first information in the first cell and initiates a random access process to the second cell based on the first information, but does not receive the second message from the first cell or the second cell due to no contention.

[0561] In other embodiments, the terminal may execute steps S3101 to S3105. For example, after receiving the first information in the first cell, the terminal initiates a random access process to the second cell based on the first information and obtains a response from the network side, thereby enabling the terminal to access the second cell.

[0562] In other embodiments, the terminal executes S3102 alone. For example, the terminal may obtain information on access to the second cell according to other means such as protocol agreement, or the terminal has previously accessed the second cell and is in the process of accessing the second cell again, then step S3101 may be omitted, and if the terminal does not receive the second message from the network side to itself, random access is stopped, etc.

[0563] In other embodiments, the terminal executes S3102 to 3105 separately. For example, the terminal can obtain information about accessing the second cell according to other methods such as protocol agreement, or the terminal has previously accessed the second cell and is in the process of accessing the second cell again, then step S3101 can be omitted.

[0564] As shown in FIG4 , an embodiment of the present disclosure provides an access method, which is performed by an access network device of a first cell, including:

[0565] S4101: Send the first message.

[0566] For the relevant content of the first information here, please refer to the description of step S2102 of the embodiment shown in FIG. 2 .

[0567] S4102: Receive the first message.

[0568] In some embodiments, the first message is sent to the first cell or the second cell.

[0569] S4102 herein may refer to step S2102 of the embodiment shown in FIG. 2 .

[0570] S4103: Send the second message.

[0571] In some embodiments, the second message may be for the terminal to access the first cell or the second cell.

[0572] For the relevant description of the second message here, please refer to step S2103 of the embodiment shown in FIG. 2 .

[0573] S4104: Receive the third message.

[0574] For the relevant description of the third message here, please refer to step S2104 of the embodiment shown in FIG. 2 .

[0575] S4105: Send the fourth message.

[0576] In some embodiments, the terminal receives the fourth message in the first cell.

[0577] In some embodiments, the access network device of the first cell may perform step S4101 alone, that is, steps S4102 to S4105 may all be optional steps. For example, if the terminal does not initiate a random access procedure or directly initiates a random access procedure with the second cell, the access network device of the first cell does not need to perform steps S4102 to S4105.

[0578] In some embodiments, the access network device of the first cell may independently perform steps S4101 to S4102. For example, after receiving the first message, the terminal determines to initiate a random access procedure to the second cell, and initiates the random access procedure to the second cell on the first cell. Therefore, the first cell receives the first message. However, steps S4103 to S4105 may be performed by the second cell, or, if the second cell does not allow the terminal to access, steps S4103 to S4105 may be omitted.

[0579] In some embodiments, the access network device of the first cell may independently perform steps S4101 to S4103. For example, after receiving the first message, the terminal determines to initiate a random access process to the second cell, and initiates the random access process to the second cell on the first cell, so the first cell will receive the first message. However, S4104 to S4105 may be performed by the second cell.

[0580] In some embodiments, the access network device of the first cell may independently perform steps S4101 to S4104. For example, after receiving the first message, the terminal determines to initiate a random access procedure to the second cell, and initiates the random access procedure to the second cell on the first cell. Therefore, the first cell receives the first message. However, S4105 may be performed by the second cell.

[0581] In some embodiments, the access network device of the first cell may independently perform step S4102, and the other steps are optional. For example, the terminal may obtain relevant information for accessing the second cell through other means without receiving the first information, and initiate a random access procedure for accessing the second cell on the first cell. However, if the network ultimately determines that the terminal is not allowed to access the second cell, the subsequent steps may be omitted, or one or more of the subsequent steps S4103 to S4105 may be performed by the second cell.

[0582] In some embodiments, the access network device of the first cell may independently perform step S4103, and the other steps are optional. For example, the terminal may obtain relevant information about accessing the second cell through other means without receiving the first message, and one or more steps from S4104 to S4105 following the first cell sending the second message may be performed by the second cell.

[0583] In some embodiments, the access network device of the first cell may independently perform steps S4103 and S4105, and the other steps are optional. For example, the terminal may obtain relevant information about access to the second cell through other means without receiving the first message, and one or more steps from S4101 to S4103 following the first cell sending the second message may be performed by the second cell.

[0584] For the description of the first cell and the second cell in this embodiment, please refer to the embodiment shown in FIG2 .

[0585] As shown in FIG5 , an embodiment of the present disclosure provides an access method, which is performed by an access network device of a second cell, including:

[0586] S5101: Receive the first message.

[0587] S5101 herein may refer to step S2102 of the embodiment shown in FIG. 2 .

[0588] In some embodiments, the access network device of the second cell may receive the first message sent by the terminal.

[0589] S5102: Send the second message.

[0590] In some embodiments, the second message may be for the terminal to access the second cell.

[0591] For the relevant description of the second message here, please refer to step S2103 of the embodiment shown in FIG. 2 .

[0592] S5103: Receive the third message.

[0593] For the relevant description of the third message here, please refer to step S2104 of the embodiment shown in FIG. 2 .

[0594] S5104: Send the fourth message.

[0595] In some embodiments, the terminal receives the fourth message in the first cell.

[0596] In some embodiments, the access network device of the second cell may independently perform steps S5101 to S5104. For example, after receiving the first information sent to the first cell, the terminal initiates a random access process in the second cell.

[0597] In some embodiments, the access network device of the second cell may perform steps S5101 and S5103 separately, and the other steps are optional steps. For example, S5102 and S5104 may be performed by the first cell.

[0598] In some embodiments, the access network device of the second cell may perform steps S5102 and S5104 separately, and the other steps are optional steps. For example, S5101 and S5103 may be performed by the first cell.

[0599] In some embodiments, the access network device of the second cell may execute step S5101 alone, and the other steps are optional steps. For example, the terminal does not compete for authorization to access the second cell, so the subsequent steps may no longer be executed, or may be performed by the first cell.

[0600] For the description of the first cell and the second cell in this embodiment, please refer to the embodiment shown in FIG2 .

[0601] The embodiments of the present disclosure provide a random access procedure for an SSB / SIB1-less cell, enabling the SSB / SIB1-less cell to support terminal access and provide services to the terminal, thereby reducing power consumption costs in the operator's network operating costs. The SSB / SIB1-less cell being able to support terminal access may at least include: the SSB / SIB1-less cell being able to support initial terminal access.

[0602] At the same time, the deployment of SSB / SIB1-less cells makes network deployment more flexible. Because SSB / SIB1-less cells do not change network coverage, SSB / SIB1-less cells only provide data services and expand system capacity. Therefore, SSB / SIB1-less cells can be quickly deployed, quickly used, flexibly deployed, and enabled on demand, that is, "plug and play", improving the flexibility and timeliness of network deployment.

[0603] In some embodiments, the SSB / SIB1-less cell may serve as a secondary cell (SCell).

[0604] As shown in Figures 8A and / or 8B, embodiments of the present disclosure provide several methods for accessing an SSB / SIB1-less cell. In Figures 8A and 8B, Msg1 may refer to the aforementioned first message, Msg2 may refer to the aforementioned second message, Msg3 may refer to the aforementioned third message, and Msg4 may refer to the aforementioned fourth message.

[0605] Solution 1: Initial access to SSB / SIB1-less SCell - evaluate whether the random access procedure can be initiated and select the random access preamble and random access opportunity (RO).

[0606] For cells in normal operation, the configuration information of SSB / SIB-less cells is broadcast.

[0607] The SSB / SIB-less cell and the cell in the normal operation state have overlapping coverage or adjacent coverage, that is, the SSB / SIB-less cell and the cell in the normal operation state are in a neighboring cell relationship.

[0608] The relevant configuration information of the SSB / SIB-less cell can be configured in the SIB1 of the normal operation cell or in the newly defined SIB.

[0609] The relevant configuration information may be a type of the aforementioned first information.

[0610] The currently operating cell here may be the aforementioned first cell.

[0611] The configuration information related to the SSB / SIB-less cell includes at least one of the following:

[0612] The index of the SSB / SIB-less cell, a positive integer starting from 1. There must be at least one SSB / SIB-less cell configured in the currently operating cell.

[0613] Identification information of the SSB / SIB-less cell, for example, at least one of: PCI, cell identity, RNAC and / or TAC, etc.

[0614] The beam transmission method of the SSB / SIB-less cell, such as the period, maximum number of beams, and the beam directions in which they are transmitted. This configuration is not only used for SSB and / or SIB1.

[0615] Frequency information of SSB / SIB-less cells, such as frequency layer, SSB frequency, UL WUS frequency, etc.

[0616] List of network slices supported by SSB / SIB-less cells.

[0617] Common configuration information for SSSB / SIB-less cells, such as RACH-related configuration information. The correspondence between RACH and / or preamble and SSBs in a normal operating cell, or the correspondence between RACH and / or preamble and beams configured in a normal operating cell specifically for SSB / SIB-less cells;

[0618] The conditions or threshold configuration information for initiating the RACH process to the SSB / SIB-less cell.

[0619] All or part of the configuration information of the SSB and / or SIB1 of the SSB / SIB-less cell.

[0620] DL timing deviation between the SSB / SIB-less cell and the currently operating cell.

[0621] The DL signal set indicates the coverage of an SSB / SIB-less cell. The DL signal set includes a CSI-RS set, an SSB set, or a set containing both CSI-RS and SSB. The DL signal set is used by the UE to assess whether it is close to a sleeping cell or already within the coverage of an SSB / SIB-less cell.

[0622] Conditional configuration information used to evaluate whether the UE is close to an SSB / SIB-less cell or is already within the coverage of an SSB / SIB-less cell. For example, whether the measured target signal is greater than or less than a threshold configured on the network side can be configured per beam or by beam group.

[0623] This beam can be a CSI-RS or SSB transmission beam.

[0624] In some embodiments, the measurement quantity is RSRP or RSRQ or SINR, depending on the network side configuration.

[0625] The threshold configuration can be per CSI-RS or CSI-RS group, or per SSB index, or SSB index group, or CSI-RS and SSB index group.

[0626] The measurement value used for evaluation may be per beam, that is, per CSI-RS or SSB.

[0627] It can be based on the linear average of at least one beam, such as a group of CSI-RS or a group of SSB.

[0628] The terminal resides in a cell in normal operation and obtains relevant configuration information about nearby SSB / SIB1-less cells. It measures the configured SSB or beam related to the SSB / SIB1-less cell coverage or RACH resource selection. If an initial access process is to be initiated, it determines whether it can access the SSB / SIB1-less cell based on the above measurement results, and selects the random access preamble and / or RACH corresponding to that beam.

[0629] Solution 2: Initial access to an SSB / SIB1-less cell—Send Msg1 / 3, Receive Msg2 / 4

[0630] The terminal decides to initiate a random access procedure to the SSB / SIB1-less cell, sets the initial transmit power for sending Msg1, and sends the selected preamble on the selected RO.

[0631] The terminal receives Msg2, i.e., the random access response RAR, in a normally operating cell or a cell configured with SSB / SIB1-less cells. This is to distinguish the RAR for random access to SSB / SIB1-less cells from the RAR for random access to the currently operating cell.

[0632] Option 1: Calculate using different RA-RNTIs. When configuring at least one normally operating cell, each normally operating cell is associated with an index, such as an integer starting from 1. The SSB / SIB1-less cell index is unique within the normally operating cell. When calculating RA-RNTI, the SSB / SIB1-less cell index is considered in the formula. For example:

[0633] RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14×80×8×2×ssb_less_cell_index

[0634] The value of ssb_less_cell_index is 0, indicating that the RA-RNTI corresponding to the random access RO resource of the currently operating cell is being calculated. The values ​​of ssb_less_cell_index are 1, 2, ..., k, indicating the index of the SSB / SIB1-less cell configured in the currently operating cell, which is configured through the system broadcast of the currently operating cell. If the index of the configured SSB / SIB1-less cell is not displayed, ssb_less_cell_index is the sequential index of the configured SSB / SIB1-less cell list + 1.

[0635] Option 2.1: Use one of the two R bits in the RAR MAC PDU header to indicate the RAR of an SSB, SIB1-less cell.

[0636] Option 2.2: Use the two R bits in the RAR MAC PDU header to indicate the RARs of up to three SSB / SIB1-less cells. In these two bits, bits 10, 10, and 11 correspond to the SSB / SIB1-less cell indexes, indicating which SSB / SIB1-less cell the RAR corresponds to.

[0637] Option 2.3: To support more SSB / SIB1-less cells, use the Rbit in the RAR MAC PDU header and one bit of the BI, that is, the bit field contained in the BI field, for compression. For example, the number of bits carrying the BI index value in the BI field is compressed to 3 bits.

[0638] For example, 3 bits indicate the BI value, which can be as follows:

[0639] Option a: 0 to 7 correspond to the BI values ​​corresponding to index 0 to 7 in the BI table;

[0640] Option b: Indicated in the system broadcast of a normally operating cell or fixed by the system, each value of this revised BI (i.e., 3 bits) corresponds to an odd-numbered index in the table. For example, BI values ​​0 to 7 correspond to 1, 3, 5, 7, 9, 11, 13, and 15 in the BI table.

[0641] Option c: Indicated in the system broadcast of a normally operating cell or fixed by the system. Each value of this revised BI (i.e., 3 bits) corresponds to an even-numbered index in the table. For example, BI values ​​0 to 7 correspond to BI values ​​corresponding to indices 0, 2, 4, 6, 8, 10, 12, and 14 in the BI table, respectively.

[0642] Option d: Each value of the revised BI (that is, 3 bits) corresponds to the BI, which is the average of the two indices 2n and 2n+1 in the BI table, rounded down or up.

[0643] Option 2.4: Use the SB / SIB1-less index in the subheader of each RAR of the RAR MAC PDU to indicate which SB / SIB1-less cell this RAR belongs to.

[0644] Option 2.5: Use the Rbit in each RAR of the RAR MAC PDU to indicate the RAR indication of the SSB / SIB1-less cell.

[0645] Option 2.6: Utilize some bits in the TA and / or R bits in each RAR of the RAR MAC PDU to indicate the SSB / SIB1-less cell index. The remaining bits in the TA are used to indicate the delta TA portion. The initial TA is configured via system broadcast in the normal operating cell.

[0646] The UL grant given on the received corresponding RAR is used to send Msg3. The retransmission scheduling of Msg3 can be scheduled on a normal operating cell or on an SSB / SIB1-less cell.

[0647] If scheduling is performed on a normally operating cell, it depends on direct negotiation between the normally operating cell and the SSB / SIB1-less cell to ensure that the C-RNTI allocated by the SSB / SIB1-less cell in the RAR does not conflict with the C-RNTI allocated by the normally operating cell to other UEs.

[0648] Receive Msg4 on a normal operation cell or receive Msg4 on an SSB / SIB1-less cell. If Msg4 is received on a normal operation cell, it depends on the normal operation cell and the SSB / SIB1-less cell to directly negotiate to ensure that the C-RNTI allocated by the SSB / SIB1-less cell in the RAR does not conflict with the C-RNTI allocated by the normal operation cell to other UEs.

[0649] The embodiments of the present disclosure support deployment in SSB / SIB1-less cells and the process of initiating access to SSB / SIB1-less cells. SSB / SIB1-less cells can be quickly deployed, quickly used, flexibly deployed, and enabled on demand, that is, "plug and play", thereby improving the flexibility and timeliness of network deployment.

[0650] Supports deployment in SSB / SIB1-less cells and the process of initiating initial access to SSB / SIB1-less cells.

[0651] The embodiments of the present disclosure also provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., an access network device or a core network device) in any of the above methods.

[0652] It should be understood that the division of the various units or modules in the above devices is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above devices, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0653] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP); in another implementation, the processor can implement certain functions through the logical relationship of the hardware circuit, and the logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable, such as a hardware circuit implemented by a processor as an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document to implement the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0654] Figure 9A is a schematic diagram of the structure of a terminal provided by an embodiment of the present disclosure. As shown in Figure 9A, the first base station provided by an embodiment of the present disclosure includes: a receiving module 910 configured to receive first information of a second cell from a first cell, wherein the first cell is a neighboring cell of the second cell; the first information is used by the terminal to access the second cell; and the second cell does not send at least one of the following:

[0655] Synchronization signal broadcast channel block SSB;

[0656] System Information Block SIB;

[0657] Paging message.

[0658] Optionally, the receiving module 910 may be configured to execute steps related to information reception performed by the terminal in any of the above access methods, which will not be described in detail here.

[0659] In some embodiments, the terminal may further include a sending module, and the sending module is used to execute the sending-related steps performed by the terminal in any of the above access methods performed by the first base station, which will not be repeated here.

[0660] In some embodiments, the terminal further includes one or more processing modules, which can be used to perform information processing.

[0661] FIG9B is a schematic diagram of the structure of an access network device provided in an embodiment of the present disclosure. As shown in FIG9B , the access network device of the first cell provided in an embodiment of the present disclosure includes:

[0662] The sending module 920 is configured to send first information in the first cell or the second cell, where the first information is used for the terminal to access the second cell; the second cell does not send at least one of the following:

[0663] Synchronization signal broadcast channel block SSB;

[0664] System Information Block SIB;

[0665] Paging message.

[0666] Optionally, the sending module 920 is configured to execute the steps related to information sending executed by the terminal in any of the above access methods of the access network device, which are not described in detail here.

[0667] The access network device may further include a receiving module, which may be further configured to execute the steps related to information reception performed by the terminal in any of the above access methods for the access network device, and will not be described in detail here.

[0668] In some embodiments, the access network device further includes one or more processing modules, which can be used to perform information processing.

[0669] Figure 9C is a schematic diagram of the structure of an access network device for a second cell provided in an embodiment of the present disclosure. As shown in Figure 9C, the access network device for a second cell provided in an embodiment of the present disclosure includes: a sending module 930 and / or a receiving module 940. The sending module 930 can be used to perform the sending-related steps provided in any embodiment of the aforementioned access method performed by the second cell. The receiving module 940 can be used to perform the receiving-related steps provided in any embodiment of the aforementioned access method performed by the second cell.

[0670] In some embodiments, the access network device further includes one or more processing modules, which can be used to perform information processing.

[0671] Figure 10A is a schematic diagram of the structure of a communication device 8100 provided in an embodiment of the present disclosure. The communication device 8100 can be a terminal or a network device (e.g., an access network device or a core network device), or a terminal (e.g., a user equipment (UE)). It can also be a chip, chip system, or processor that supports a network device to implement any of the above methods. It can also be a chip, chip system, or processor that supports a terminal to implement any of the above access methods. The communication device 8100 can be used to implement the access method described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0672] As shown in Figure 10A, the communication device 8100 includes one or more processors 8101. The processor 8101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control the communication device (such as a base station, baseband chip, terminal device, terminal device chip, DU or CU, etc.), execute programs, and process program data. The processor 8101 is used to call instructions to enable the communication device 8100 to perform any of the above access methods.

[0673] In some embodiments, the communication device 8100 further includes one or more memories 8102 for storing instructions. Optionally, all or part of the memories 8102 may be located outside the communication device 8100.

[0674] In some embodiments, the communication device 8100 further includes one or more transceivers 8103. When the communication device 8100 includes one or more transceivers 8103, the communication steps such as sending and receiving in the above method are performed by the transceiver 8103, and the other steps are performed by the processor 8101.

[0675] In some embodiments, a transceiver may include a receiver and a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, and transceiver circuit may be used interchangeably; the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be used interchangeably; and the terms receiver, receiving unit, receiver, and receiving circuit may be used interchangeably.

[0676] Optionally, the communication device 8100 further includes one or more interface circuits 8104, which are connected to the memory 8102. The interface circuits 8104 can be used to receive signals from the memory 8102 or other devices, and can be used to send signals to the memory 8102 or other devices. For example, the interface circuits 8104 can read instructions stored in the memory 8102 and send the instructions to the processor 8101.

[0677] The communication device 8100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 8100 described in the present disclosure is not limited thereto, and the structure of the communication device 8100 may not be limited by FIG. 10A. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: (1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0678] FIG10B is a schematic diagram of the structure of the chip 8200 provided in an embodiment of the present disclosure. If the communication device 8100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 8200 shown in FIG10B , but the present disclosure is not limited thereto.

[0679] The chip 8200 includes one or more processors 8201, and the processor 8201 is used to call instructions to enable the chip 8200 to execute any of the above access methods.

[0680] In some embodiments, chip 8200 further includes one or more interface circuits 8202, which are connected to memory 8203. Interface circuit 8202 can be used to receive signals from memory 8203 or other devices, and can be used to send signals to memory 8203 or other devices. For example, interface circuit 8202 can read instructions stored in memory 8203 and send the instructions to processor 8201. Optionally, the terms interface circuit, interface, transceiver pin, and transceiver are interchangeable.

[0681] In some embodiments, the chip 8200 further includes one or more memories 8203 for storing instructions. Alternatively, all or part of the memories 8203 may be outside the chip 8200.

[0682] The present disclosure also provides a storage medium having instructions stored thereon, which, when executed on the communication device 8100, causes the communication device 8100 to execute any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but may also be a transient storage medium.

[0683] The present disclosure further provides a program product, which, when executed by the communication device 8100, enables the communication device 8100 to perform any of the above access methods. Optionally, the program product is a computer program product.

[0684] The present disclosure also provides a computer program, which, when executed on a computer, enables the computer to execute any one of the above access methods.

[0685] Other embodiments of the presently disclosed embodiments will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the presently disclosed embodiments that follow the general principles of the presently disclosed embodiments and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered as exemplary only, with the true scope and spirit of the presently disclosed embodiments being indicated by the following claims.

[0686] It should be understood that the embodiments of the present disclosure are not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the embodiments of the present disclosure is limited only by the appended claims.

Claims

1. An access method, wherein: The method comprises: The terminal receives first information of a second cell from a first cell, wherein the second cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell; the first information is used for the terminal to access the second cell; the second cell is a cell in a dormant state, or the second cell does not send at least one of the following: Synchronization signal broadcast channel block SSB; One or more system information blocks SIB; Paging message.

2. The method according to claim 1, wherein: The second cell does not send SSB, SIB and paging messages.

3. The method according to claim 1 or 2, wherein: The first cell sends one or more of the following: SSB; SIB; Paging message.

4. The method according to any one of claims 1 to 3, wherein: The first information includes at least one of the following: an index of the second cell; a cell identifier of the second cell; The beam information of the second cell is used to indicate whether the second cell uses beam communication and / or to indicate the beam configuration of the beam communication of the second cell; Frequency information, used to indicate a carrier frequency used by the second cell; Slice information, used to indicate whether the second cell supports network slicing and / or an identifier of supported network slices; access configuration, used by the terminal to determine whether to access the second cell; coverage information of the second cell; Reference information, used to indicate whether the terminal can access the second cell; signal information, used to indicate a reference signal related to the second cell; The timing information is used to indicate the association relationship between the downlink timing of the first cell and the second cell.

5. The method according to claim 1 or 2, wherein: The method further comprises: When the condition for accessing the second cell is met, a first message Msg1 is sent to the first cell or the second cell, where the Msg1 is used to request uplink scheduling.

6. The method according to claim 5, wherein: The method further comprises: The terminal receives a second message Msg2 from the first cell or the second cell, wherein the Msg2 is a random access response, and the random access response carries an uplink grant.

7. The method according to claim 6, wherein: The information content of the Msg2 sent by the first cell for the terminal to access the second cell is different from the information content of the Msg2 sent by the first cell for the terminal to access the first cell; or, The scrambling sequence of the Msg2 sent by the first cell for the terminal to access the second cell is different from the scrambling sequence of the Msg2 sent by the first cell for the terminal to access the first cell.

8. The method according to claim 7, wherein: The scrambling sequence of the Msg2 for accessing the second cell includes: a radio access-radio network temporary identifier RA-RNTI associated with the second cell; and / or, The scrambling sequence of Msg2 for accessing the first cell includes: the RA-RNTI associated with the first cell.

9. The method according to claim 8, wherein: The RA-RNTI associated with the second cell is determined according to the cell identifier of the second cell.

10. The method according to claim 7, wherein: The different message contents between the second message sent by the first cell for the terminal to access the second cell and the second message sent by the first cell for the terminal to access the first cell include one of the following: Cell indication; Timing information.

11. The method according to claim 10, wherein: The cell indication is carried in at least one of the following: The media access control MAC protocol data packet PDU header of the Msg2; The PDU subheader of the Msg2; the MAC PDU includes a sub-PDU; wherein the PDU subheader is the sub-PDU head; The random access response RAR of the MAC sub-PDU of the Msg2.

12. The method according to claim 10, wherein: The cell indication is carried in the reserved R field of the PDU header of the Msg2; or, The cell indication is carried in the R field and the fallback indication BI field of the PDU header of the Msg2.

13. The method according to claim 12, wherein: The BI field includes a first bit and a second bit; wherein the first bit and the R field are used to carry the cell indication; and the second bit is used to indicate a BI index value.

14. The method according to claim 13, wherein: The second bit is used to indicate one of the following: BI index value of the first range; Even-numbered BI index values ​​in the second range; An odd-numbered BI index value in the second range; The first range is a subset of the second range, and the first range contains a continuous distribution of BI index values.

15. The method according to claim 13, wherein: A bit value of the second bit points to two BI index values ​​distributed adjacently within the second range, and the BI corresponding to the second bit is: the average value of the BI indicated by the two BI index values ​​distributed adjacently indicated by the second bit, the average value rounded up, or the average value rounded down.

16. The method according to claim 10, wherein: The timing information carried by the Msg2 sent by the first cell for the terminal to access the first cell is: a first timing advance; The timing information carried in the Msg2 sent by the first cell for the terminal to access the second cell is: the difference between the first timing advance and the second timing advance; The first timing advance is used for communication between the terminal and the first cell; The second timing advance is used for communication between the terminal and the second cell.

17. The method according to any one of claims 6 to 14, wherein: The method further comprises: The terminal sends a third message Msg3 to the first cell or the second cell, wherein the Msg3 is used by the terminal to request access to the second cell.

18. The method according to claim 17, wherein: The method further comprises: The terminal receives a fourth message Msg4 sent by the first cell or the second cell, wherein the Msg4 is used by the terminal to confirm that it has accessed the second cell.

19. An access method, wherein: The method comprises: The access network device sends first information in the first cell or the second cell, wherein the first information is used for the terminal to access the second cell; the second cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell; the second cell is a cell in a dormant state, or the second cell does not send at least one of the following contents: Synchronization signal broadcast channel block SSB; One or more system information blocks SIB; Paging message.

20. The method according to claim 19, wherein: The first information includes at least one of the following: an index of the second cell; a cell identifier of the second cell; The beam information of the second cell is used to indicate whether the second cell uses beam communication and / or to indicate the beam configuration of the beam communication of the second cell; Frequency information, used to indicate a carrier frequency used by the second cell; Slice information, used to indicate whether the second cell supports network slicing and / or an identifier of supported network slices; access configuration, used by the terminal to determine whether to access the second cell; coverage information of the second cell; Reference information, used to indicate whether the terminal can access the second cell; signal information, used to indicate reference signal timing information related to the second cell; The timing information is used to indicate the association relationship between the downlink timing of the first cell and the second cell.

21. The method according to claim 19 or 20, wherein: The method further comprises: A first message Msg1 is received, wherein the Msg1 is used to request uplink scheduling of the second cell when a condition for accessing the second cell is met.

22. The method according to claim 20, wherein: The method further comprises: A second message Msg2 is sent in the first cell or the second cell, where the Msg2 is a random access response, and the random access response carries an uplink authorization.

23. The method according to claim 22, wherein: The information content of the Msg2 sent by the first cell for the terminal to access the second cell is different from the information content of the Msg2 sent by the first cell for the terminal to access the first cell; or, The scrambling sequence of the Msg2 sent by the first cell for the terminal to access the second cell is different from the scrambling sequence of the Msg2 sent by the first cell for the terminal to access the first cell.

24. The method according to claim 23, wherein: The scrambling sequence of the Msg2 for accessing the second cell includes: a radio access-radio network temporary identifier RA-RNTI associated with the second cell; and / or, The scrambling sequence of Msg2 for accessing the first cell includes: the RA-RNTI associated with the first cell.

25. The method according to claim 24, wherein: The RA-RNTI associated with the second cell is determined according to the cell identifier of the second cell.

26. The method of claim 23, wherein: The second message sent by the first cell for the terminal to access the second cell has different message contents from the second message sent by the first cell for the terminal to access the first cell, including one of the following: Cell indication; Timing information.

27. The method according to claim 26, wherein: The cell indication is carried in at least one of the following: The media access control MAC protocol data packet PDU header of the Msg2; The PDU subheader of the Msg2; the MAC PDU includes a sub-PDU; wherein the PDU subheader is a header of the sub-PDU; The random access response RAR of the MAC sub-PDU of the Msg2.

28. The method according to claim 25, wherein: The cell indication is carried in the reserved R field of the PDU header of the Msg2; or, The cell indication is carried in the R field and the fallback indication BI field of the PDU header of the Msg2.

29. The method according to claim 28, wherein: The BI field includes a first bit and a second bit; wherein the first bit is used with the R field to carry the cell indication; and the second bit is used to indicate a BI index value.

30. The method of claim 29, wherein: The second bit is used to indicate one of the following: BI index value of the first range; Even-numbered BI index values ​​in the second range; An odd-numbered BI index value in the second range; Among them, the first range is a subset of the second range, and the BI index values ​​contained in the first range are continuously distributed.

31. The method of claim 29, wherein: A bit value of the second bit points to two BI index values ​​distributed adjacently within the second range, and the BI corresponding to the second bit is: the average value of the BI indicated by the two BI index values ​​distributed adjacently indicated by the second bit, the average value rounded up, or the average value rounded down.

32. The method of claim 26, wherein: The timing information carried by the second message sent by the first cell for the terminal to access the first cell is: a first timing advance; The timing information carried by the second message sent by the first cell for the terminal to access the second cell is: the difference between the first timing advance and the second timing advance; The first timing advance is used for communication between the terminal and the first cell; The second timing advance is used for communication between the terminal and the second cell.

33. The method according to any one of claims 22 to 32, wherein: The method further comprises: A third message Msg3 is received, where the Msg3 is used by the second cell to request access to the second cell.

34. The method of claim 33, wherein: The method further comprises: The terminal receives a fourth message Msg4 sent by the first cell or the second cell, wherein the Msg4 is used to confirm that the terminal has accessed the second cell.

35. A terminal, wherein: The terminal comprises: A receiving module is configured to receive first information of a second cell from a first cell, wherein the second cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell; the first information is used for the terminal to access the second cell; the second cell does not send at least one of the following: Synchronization signal broadcast channel block SSB; One or more system information blocks SIB; Paging message.

36. An access network device, the access network device comprising: The sending module is configured to send first information in the first cell or the second cell, wherein the first information is used for the terminal to access the second cell; the second cell is a cell in a dormant state, or the cell does not send at least one of the following contents: Synchronization signal broadcast channel block SSB; One or more system information blocks SIB; Paging messages; The second cell has overlapping coverage with the first cell, or the second cell is adjacent to the first cell.

37. A communication device, wherein: The communication device comprises: one or more processors; The processor is used to call instructions so that the communication device executes the access method described in any one of claims 1 to 18 or claims 19 to 34.

38. A storage medium, wherein: The storage medium stores instructions, and when the instructions are executed on the communication device, the communication device executes the access method according to any one of claims 1 to 16 or claims 17 to 25.

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