Initial access method and device

Abstract

The embodiment of the invention discloses an initial access method and a device thereof. The method comprises the following steps that: a terminal establishes and / or recovers radio resource control (RRC) connection on an anchor cell; the terminal receives indication information sent by the anchor cell, the indication information is used for indicating the terminal to be redirected to a first network energy-saving cell, and the first network energy-saving cell is a network energy-saving cell associated with the anchor cell; and the terminal initiates a random access process on the first network energy-saving cell. By implementing the embodiment of the invention, the terminal can be redirected to the network energy-saving cell to initiate the random access on the network energy-saving cell, so that the purpose of reducing the cost of operating a 5G system by an operator can be achieved, and the network energy-saving effect is realized.

Description

Initial access method and device thereof Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to an initial access method and device thereof. Background Art

[0002] With the gradual application of large-scale active antenna arrays and the large-scale construction of fifth-generation (5G) mobile networks, the energy consumption of wireless communication networks has increased significantly. The growth rate of energy consumption costs has even exceeded the revenue growth of operators. Therefore, network energy saving is an important means for operators to reduce the cost of operating 5G systems.

[0003] However, currently there is still a lack of effective means for redirecting a terminal to a network energy-saving cell to initiate random access on the network energy-saving cell.

[0004] Summary of the Invention

[0005] The embodiments of the present disclosure provide an initial access method and apparatus thereof.

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

[0007] The terminal establishes and / or restores a radio resource control RRC connection on an anchor cell so that the anchor cell redirects the terminal to a first network energy-saving cell; the first network energy-saving cell is a network energy-saving cell associated with the anchor cell;

[0008] receiving indication information sent by the anchor cell, where the indication information is used to instruct the terminal to redirect to the first network energy-saving cell;

[0009] A random access process is initiated on the first network energy-saving cell.

[0010] According to a second aspect of an embodiment of the present disclosure, an initial access method is proposed, including:

[0011] The anchor cell receives a radio resource control (RRC) connection establishment and / or restoration request message sent by the terminal, wherein the RRC connection establishment request message is used to request establishment of the RRC connection with the anchor cell, and the RRC connection restoration request message is used to request restoration of the RRC connection suspended in the anchor cell;

[0012] Determining that the terminal needs to be redirected to a first network energy-saving cell; wherein the first network energy-saving cell is a network energy-saving cell associated with the anchor cell;

[0013] Sending indication information to the terminal, where the indication information is used to instruct the terminal to redirect to the first network energy-saving cell.

[0014] According to a third aspect of an embodiment of the present disclosure, a first communication device is provided, including:

[0015] a processing module, configured to establish and / or restore a radio resource control RRC connection on an anchor cell so that the anchor cell redirects the terminal to a first network energy-saving cell; the first network energy-saving cell is a network energy-saving cell associated with the anchor cell;

[0016] a transceiver module, configured to receive indication information sent by the anchor cell, where the indication information is used to instruct the terminal to redirect to the first network energy-saving cell;

[0017] The processing module is further configured to initiate a random access process on the first network energy-saving cell.

[0018] According to a fourth aspect of an embodiment of the present disclosure, a second communication device is provided, including:

[0019] a transceiver module, configured to receive a radio resource control (RRC) connection establishment and / or restoration request message sent by a terminal, wherein the RRC connection establishment request message is used to request establishment of the RRC connection with the anchor cell, and the RRC connection restoration request message is used to request restoration of the RRC connection suspended in the anchor cell;

[0020] a processing module, configured to determine that the terminal needs to be redirected to a first network energy-saving cell; wherein the first network energy-saving cell is a network energy-saving cell associated with the anchor cell;

[0021] The transceiver module is configured to send instruction information to the terminal, where the instruction information is used to instruct the terminal to redirect to the first network energy-saving cell.

[0022] According to a fifth aspect of an embodiment of the present disclosure, a communication system is provided, including:

[0023] A terminal, configured to execute an optional implementation of the first aspect;

[0024] The anchor cell is configured to perform the optional implementation of the aforementioned second aspect.

[0025] According to a sixth aspect of an embodiment of the present disclosure, a communication device is provided, including: one or more processors;

[0026] The processor is used to call instructions to enable the communication device to execute the optional implementation of the first and second aspects mentioned above.

[0027] According to a seventh aspect of an embodiment of the present disclosure, a storage medium is proposed, which stores instructions. When the instructions are executed on a communication device, the communication device executes optional implementation methods of the aforementioned first and second aspects.

[0028] According to the technical solution disclosed in the present invention, it is possible to redirect the terminal to a network energy-saving cell to initiate random access on the network energy-saving cell, thereby achieving the goal of reducing the cost of operating the 5G system for operators and realizing network energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following drawings required for describing the embodiments are introduced. The following drawings are merely some embodiments of the present disclosure and do not impose specific limitations on the protection scope of the present disclosure.

[0030] FIG1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present disclosure;

[0031] FIG2A is an interactive diagram illustrating an initial access method according to an embodiment of the present disclosure;

[0032] FIG2B is an interactive diagram illustrating an initial access method according to an embodiment of the present disclosure;

[0033] FIG2C is an interactive diagram illustrating an initial access method according to an embodiment of the present disclosure;

[0034] FIG2D is an interactive diagram illustrating an initial access method according to an embodiment of the present disclosure;

[0035] FIG3A is a schematic diagram showing a flow chart of an initial access method according to an embodiment of the present disclosure;

[0036] FIG3B is a schematic diagram of a process of an initial access method according to an embodiment of the present disclosure;

[0037] FIG3C is a schematic diagram of a process of an initial access method according to an embodiment of the present disclosure;

[0038] FIG3D is a schematic diagram of a process of an initial access method according to an embodiment of the present disclosure;

[0039] FIG3E is a schematic diagram of a process of an initial access method according to an embodiment of the present disclosure;

[0040] FIG4A is a schematic diagram showing a flow chart of an initial access method according to an embodiment of the present disclosure;

[0041] FIG4B is a schematic diagram of a process of an initial access method according to an embodiment of the present disclosure;

[0042] FIG4C is a schematic diagram showing a flow chart of an initial access method according to an embodiment of the present disclosure;

[0043] FIG4D is a schematic diagram of a process of an initial access method according to an embodiment of the present disclosure;

[0044] FIG4E is a schematic diagram of a process of an initial access method according to an embodiment of the present disclosure;

[0045] FIG5 is an interactive diagram of the initial access method proposed in an embodiment of the present disclosure;

[0046] FIG6A is a schematic structural diagram of a terminal proposed in an embodiment of the present disclosure;

[0047] FIG6B is a schematic diagram of the structure of an anchor cell proposed in an embodiment of the present disclosure;

[0048] FIG7A is a schematic structural diagram of a communication device 7100 proposed in an embodiment of the present disclosure;

[0049] FIG7B is a schematic structural diagram of a chip 7200 according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0050] The embodiments of the present disclosure provide an initial access method and apparatus thereof.

[0051] In a first aspect, an embodiment of the present disclosure provides an initial access method, including:

[0052] The terminal establishes and / or restores a radio resource control RRC connection on an anchor cell so that the anchor cell redirects the terminal to a first network energy-saving cell; the first network energy-saving cell is a network energy-saving cell associated with the anchor cell;

[0053] receiving indication information sent by the anchor cell, where the indication information is used to instruct the terminal to redirect to the first network energy-saving cell;

[0054] A random access process is initiated on the first network energy-saving cell.

[0055] In the above embodiment, the terminal can be redirected to the network energy-saving cell to initiate random access on the network energy-saving cell, thereby achieving the purpose of reducing the cost of operating the 5G system for operators and realizing network energy-saving effects.

[0056] In combination with some embodiments of the first aspect, in some embodiments, the terminal establishing and / or restoring a radio resource control RRC connection on the anchor cell so that the anchor cell redirects the terminal to the first network energy-saving cell includes:

[0057] The terminal sends an RRC connection establishment request message to the anchor cell; wherein the RRC connection establishment request message is used to request to establish the RRC connection with the anchor cell, and the RRC connection establishment request message includes a first cause value, and the first cause value indicates that the reason why the terminal establishes the RRC connection is that it needs to be redirected to the first network energy-saving cell.

[0058] In the above embodiment, a new cause value is defined to indicate that the reason for establishing the RRC connection this time is the need to redirect to the first network energy-saving cell, so that the anchor cell can redirect the terminal to the network energy-saving cell through redirection to initiate random access on the network energy-saving cell, thereby achieving the purpose of reducing the cost of operating the 5G system by the operator and realizing the network energy-saving effect.

[0059] In combination with some embodiments of the first aspect, in some embodiments, the terminal establishing and / or restoring a radio resource control RRC connection on the anchor cell so that the anchor cell redirects the terminal to the first network energy-saving cell includes:

[0060] The terminal sends an RRC connection recovery request message to the anchor cell; wherein the RRC connection recovery request message is used to request the recovery of the RRC connection suspended in the anchor cell, and the RRC connection recovery request message includes a first cause value, and the first cause value indicates that the reason why the terminal recovers the RRC connection suspended in the anchor cell is that it needs to be redirected to the first network energy-saving cell.

[0061] In the above embodiment, a new cause value is defined to indicate that the reason for resuming the RRC connection suspended on the anchor cell is the need to redirect to the first network energy-saving cell, so that the anchor cell can redirect the terminal to the network energy-saving cell to initiate random access on the network energy-saving cell, thereby achieving the purpose of reducing the cost of operating the 5G system by the operator and realizing the network energy-saving effect.

[0062] In combination with some embodiments of the first aspect, in some embodiments, the first cause value also indicates that the anchor cell establishes a type 1 signaling radio bearer SRB1 for the terminal and / or performs an initial security activation process, and does not establish a type 2 signaling radio bearer SRB2 and / or a data radio bearer DRB for the terminal.

[0063] In the above embodiment, the newly defined first cause value is used to instruct the anchor cell to establish SRB1 and / or perform an initial security activation process for the terminal, and not to establish SRB2 and / or DRB for the terminal, so that the anchor cell only needs to broadcast the relevant configuration information associated with the first network energy-saving cell to the terminal through SRB1 and / or an initial security activation process, so that the terminal can initiate a random access process to the first network energy-saving cell, avoid consuming more resources of the anchor cell, thereby avoiding resource waste and achieving network energy-saving effects.

[0064] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes:

[0065] After establishing and / or restoring the RRC connection on the anchor cell, the terminal sends a redirection request message to the anchor cell; wherein the redirection request message is used to request the anchor cell to redirect the terminal to the first network energy-saving cell.

[0066] In combination with some embodiments of the first aspect, in some embodiments, the terminal establishing and / or restoring a radio resource control RRC connection on the anchor cell so that the anchor cell redirects the terminal to the first network energy-saving cell includes:

[0067] The terminal sends an RRC connection establishment request message to the anchor cell; wherein the RRC connection establishment request message is used to request to establish the RRC connection with the anchor cell, and the RRC connection establishment request message includes a second cause value;

[0068] After establishing the RRC connection on the anchor cell, the terminal sends a redirection request message to the anchor cell; wherein the redirection request message is used to request the anchor cell to redirect the terminal to the first network energy-saving cell.

[0069] In the above embodiment, the terminal selects a cause value from the existing cause values ​​according to the implementation, and sends a redirection request message to the anchor cell after establishing the RRC connection to indicate that the anchor cell needs to redirect the terminal to the first network energy-saving cell, so that the terminal can initiate random access on the network energy-saving cell, thereby achieving the purpose of reducing the cost of operating the 5G system by the operator and realizing network energy-saving effect.

[0070] In combination with some embodiments of the first aspect, in some embodiments, the terminal establishing and / or restoring a radio resource control RRC connection on the anchor cell so that the anchor cell redirects the terminal to the first network energy-saving cell includes:

[0071] The terminal sends an RRC connection recovery request message to the anchor cell; wherein the RRC connection recovery request message is used to request recovery of the RRC connection suspended on the anchor cell, and the RRC connection recovery request message includes a second cause value;

[0072] After the terminal recovers the RRC connection suspended on the anchor cell, the terminal sends a redirection request message to the anchor cell; wherein the redirection request message is used to request the anchor cell to redirect the terminal to the first network energy-saving cell.

[0073] In the above embodiment, the terminal selects a cause value from the existing cause values ​​according to the implementation, and sends a redirection request message to the anchor cell after resuming the RRC connection suspended on the anchor cell to indicate that the anchor cell needs to redirect the terminal to the first network energy-saving cell, so as to facilitate the terminal to initiate random access on the network energy-saving cell, thereby achieving the purpose of operators reducing the cost of operating 5G systems and realizing network energy-saving effects.

[0074] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes at least one of the following:

[0075] Selecting, according to a higher layer or access layer (AS) layer implementation of the terminal, an RRC connection establishment cause value from at least one RRC connection establishment cause value as the second cause value;

[0076] According to the implementation of the higher layer or access layer AS layer of the terminal, one RRC connection restoration cause value is selected from at least one RRC connection restoration cause value and determined as the second cause value.

[0077] In conjunction with some embodiments of the first aspect, in some embodiments, the at least one RRC connection establishment cause value and / or RRC connection recovery cause value includes at least one of the following:

[0078] Emergency call emergency;

[0079] High priority access highPriorityAccess;

[0080] The called party accesses mt-Access;

[0081] mo-Signalling;

[0082] Caller data mo-Data;

[0083] Delay-tolerant access delayTolerantAccess.

[0084] In conjunction with some embodiments of the first aspect, in some embodiments, the receiving the indication information sent by the anchor cell includes:

[0085] An RRC connection release message sent by the anchor cell is received, where the RRC connection release message is used to instruct the terminal to release the RRC connection, and the RRC connection release message includes the indication information.

[0086] In the above embodiment, the redirection indication information is provided to the terminal through the RRC connection release message, so that the terminal can initiate a random access process on the network energy-saving cell based on the indication information in the redirection indication information. There is no need to define new signaling, and the existing signaling is used to avoid the overhead of signaling resources.

[0087] In conjunction with some embodiments of the first aspect, in some embodiments, the indication information includes at least one of the following:

[0088] Information indicating the identity of the redirecting cell;

[0089] Information indicating the frequency of the redirected cell;

[0090] Information indicating whether the redirected cell is a network energy-saving cell.

[0091] In conjunction with some embodiments of the first aspect, in some embodiments, initiating a random access process on the first network energy-saving cell includes:

[0092] Obtaining configuration information of the energy-saving cell of the first network;

[0093] A random access process is initiated on the first network energy-saving cell according to the configuration information of the first network energy-saving cell.

[0094] In conjunction with some embodiments of the first aspect, in some embodiments, obtaining the configuration information of the first network energy-saving cell includes at least one of the following:

[0095] Acquire system information block SIB information of the anchor cell, where the SIB information includes configuration information of one or more network energy-saving cells, and acquire configuration information of a first network energy-saving cell in the SIB information according to the indication information and the SIB information;

[0096] Obtaining SIB information of the anchor cell, and obtaining configuration information of the first network energy-saving cell according to the SIB information of the anchor cell;

[0097] According to the indication information, configuration information of the first network energy-saving cell is acquired.

[0098] In combination with some embodiments of the first aspect, in some embodiments, obtaining the configuration information of the first network energy-saving cell according to the indication information and the SIB information includes at least one of the following:

[0099] Determining, according to the indication information, that the redirected cell is a network energy-saving cell;

[0100] Acquire, according to the indication information, an identifier and / or a frequency of the redirected cell;

[0101] In the configuration information of one or more network energy-saving cells in the SIB information, the configuration information of the network energy-saving cell associated with the identifier and / or frequency is determined as the configuration information of the first network energy-saving cell.

[0102] In conjunction with some embodiments of the first aspect, in some embodiments, the configuration information of the first network energy-saving cell includes at least one of the following:

[0103] the identifier and / or frequency of the energy-saving cell of the first network;

[0104] Random access channel (RACH) related configuration information of the first network energy-saving cell;

[0105] Information in SRB1 of the first network energy-saving cell.

[0106] In combination with some embodiments of the first aspect, in some embodiments, the first network energy-saving cell and the anchor cell have a neighboring cell relationship.

[0107] In a second aspect, an embodiment of the present disclosure provides an initial access method, including:

[0108] The anchor cell receives a radio resource control (RRC) connection establishment and / or restoration request message sent by the terminal, wherein the RRC connection establishment request message is used to request establishment of the RRC connection with the anchor cell, and the RRC connection restoration request message is used to request restoration of the RRC connection suspended in the anchor cell;

[0109] Determining that the terminal needs to be redirected to a first network energy-saving cell; wherein the first network energy-saving cell is a network energy-saving cell associated with the anchor cell;

[0110] Sending indication information to the terminal, where the indication information is used to instruct the terminal to redirect to the first network energy-saving cell.

[0111] In combination with some embodiments of the second aspect, in some embodiments, the RRC connection establishment request message includes a first cause value, where the first cause value indicates that the reason why the terminal establishes the RRC connection is that redirection to the first network energy-saving cell is required; and / or the RRC connection restoration request message includes a first cause value, where the first cause value indicates that the reason why the terminal resumes the RRC connection suspended in the anchor cell is that redirection to the first network energy-saving cell is required;

[0112] The determining that the terminal needs to be redirected to the first network energy-saving cell includes:

[0113] According to the first cause value, it is determined that the terminal needs to be redirected to the first network energy-saving cell.

[0114] In combination with some embodiments of the second aspect, in some embodiments, the first cause value also indicates that the anchor cell establishes a type 1 signaling radio bearer SRB1 for the terminal and / or performs an initial security activation process, and does not establish a type 2 signaling radio bearer SRB2 and / or a data radio bearer DRB for the terminal.

[0115] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0116] The anchor cell establishes a signaling radio bearer SRB1 of type 1 and / or performs an initial security activation process for the terminal, and does not establish a signaling radio bearer SRB2 of type 2 and / or a data radio bearer DRB for the terminal.

[0117] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0118] Receive a redirection request message sent by the terminal after establishing and / or restoring the RRC connection on the anchor cell; wherein the redirection request message is used to request the anchor cell to redirect the terminal to the first network energy-saving cell.

[0119] In conjunction with some embodiments of the second aspect, in some embodiments, the RRC connection establishment and / or restoration request message includes a second cause value;

[0120] The determining that the terminal needs to be redirected to the first network energy-saving cell includes:

[0121] receiving a redirection request message sent by the terminal after establishing and / or restoring the RRC connection on the anchor cell; wherein the redirection request message is used to request the anchor cell to redirect the terminal to the first network energy-saving cell;

[0122] Based on the redirection request message, it is determined that the terminal needs to be redirected to the first network energy-saving cell.

[0123] In combination with some embodiments of the second aspect, in some embodiments, the second cause value is an RRC connection establishment cause value selected by a higher layer or access layer AS layer of the terminal from at least one RRC connection establishment cause value; or,

[0124] The second cause value is an RRC connection restoration cause value selected by a higher layer or an access layer (AS) layer of the terminal from at least one RRC connection restoration cause value.

[0125] In conjunction with some embodiments of the second aspect, in some embodiments, the at least one RRC connection establishment cause value and / or RRC connection recovery cause value includes at least one of the following:

[0126] Emergency call emergency;

[0127] High priority access highPriorityAccess;

[0128] The called party accesses mt-Access;

[0129] mo-Signalling;

[0130] Caller data mo-Data;

[0131] Delay-tolerant access delayTolerantAccess.

[0132] In conjunction with some embodiments of the second aspect, in some embodiments, sending indication information to the terminal includes:

[0133] An RRC connection release message is sent to the terminal, where the RRC connection release message is used to instruct the terminal to release the RRC connection, and the RRC connection release message includes the indication information.

[0134] In conjunction with some embodiments of the second aspect, in some embodiments, the indication information includes at least one of the following:

[0135] Information indicating the identity of the redirecting cell;

[0136] Information indicating the frequency of the redirected cell;

[0137] Information indicating whether the redirected cell is a network energy-saving cell.

[0138] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes:

[0139] Send system information block SIB information to the terminal, wherein the SIB information includes configuration information of one or more network energy-saving cells, and the SIB information is used by the terminal to obtain the configuration information of the first network energy-saving cell in combination with the indication information, and the configuration information of the first network energy-saving cell is used by the terminal to initiate a random access process on the first network energy-saving cell.

[0140] In conjunction with some embodiments of the second aspect, in some embodiments, the configuration information of the first network energy-saving cell includes at least one of the following:

[0141] the identifier and / or frequency of the energy-saving cell of the first network;

[0142] Random access channel (RACH) related configuration information of the first network energy-saving cell;

[0143] Information in SRB1 of the first network energy-saving cell.

[0144] In combination with some embodiments of the second aspect, in some embodiments, the first network energy-saving cell and the anchor cell have a neighboring cell relationship.

[0145] In a third aspect, an embodiment of the present disclosure proposes a terminal, comprising at least one of a transceiver module and a processing module; wherein the terminal is used to execute the optional implementation method of the first aspect.

[0146] In a fourth aspect, an embodiment of the present disclosure proposes an anchor cell, comprising at least one of a transceiver module and a processing module; wherein the anchor cell is used to execute the optional implementation of the second aspect.

[0147] In a fifth aspect, an embodiment of the present disclosure provides a communication system, including:

[0148] A terminal configured as an optional implementation of the first aspect;

[0149] The anchor cell is configured to perform the optional implementation of the aforementioned second aspect.

[0150] In a sixth aspect, an embodiment of the present disclosure proposes a communication device, comprising: one or more processors; wherein the processor is used to call instructions to enable the communication device to execute the optional implementation method of the aforementioned first aspect.

[0151] In a seventh aspect, an embodiment of the present disclosure proposes a communication device, comprising: one or more processors; wherein the processor is used to call instructions to enable the communication device to execute the optional implementation method of the aforementioned second aspect.

[0152] In an eighth aspect, an embodiment of the present disclosure proposes a storage medium storing instructions. When the instructions are executed on a communication device, the communication device executes optional implementation methods of the aforementioned first and second aspects.

[0153] In a ninth aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the optional implementation of the first and second aspects.

[0154] In a tenth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the optional implementation of the first and second aspects.

[0155] In an eleventh aspect, an embodiment of the present disclosure provides a chip or a chip system, wherein the chip or chip system includes a processing circuit configured to execute the method described in the optional implementation of the first and second aspects above.

[0156] It is understandable that the above-mentioned terminal, anchor cell, communication system, storage medium, program product, computer program, chip or chip system are all used to perform the method proposed in the embodiment of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding method and will not be repeated here.

[0157] The present disclosure provides an initial access method and apparatus thereof. In some embodiments, the terms "initial access method," "information processing method," and "communication method" are interchangeable; the terms "initial access apparatus," "information processing apparatus," and "communication apparatus" are interchangeable; and the terms "initial access system," "information processing system," and "communication system" are interchangeable.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0162] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0163] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0164] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to 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 above is also applicable when there are more branches such as A, B, and C.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] In some embodiments, terms such as "time / frequency" and "time / frequency domain" refer to the time domain and / or the frequency domain.

[0169] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0170] 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.

[0171] In some embodiments, devices and equipment can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they can also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject", etc.

[0172] In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc.

[0173] In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)", "base station (BS)", "radio base station", "fixed station", and in some embodiments may also be understood as "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission and / or reception point (TRP)" "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)", etc.

[0174] In some embodiments, "terminal" or "terminal device" may be referred to as "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.

[0175] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0176] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0177] Figure 1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure. The communication system may include, but is not limited to, one terminal and one anchor cell. The number and configuration of devices shown in Figure 1 are for example purposes only and do not limit the present disclosure. In actual applications, two or more terminals and two or more anchor cells may be included. The communication system 100 shown in Figure 1 includes, for example, one terminal 101 and one anchor cell 102.

[0178] In some embodiments, the terminal 101 herein may be an entity on the user side for receiving or transmitting signals, such as a mobile phone. It may also be referred to as a terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), etc. The terminal may be a car with communication capabilities, a smart car, a mobile phone, a wearable device, a tablet computer (Pad), a computer with wireless transceiver capabilities, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. The embodiments of the present disclosure do not limit the specific technology and specific device form adopted by the terminal.

[0179] In some embodiments, the network device associated with the anchor cell 102 may be an access network device. In some embodiments, the access network device is, for example, a node or device that connects a terminal to a wireless network. The access network device may include at least one of an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a NodeB (NB), a home nodeB (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 RAN, a cloud RAN, a base station in other communication systems, and an access node in a Wi-Fi system, but is not limited thereto.

[0180] 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 Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0181] 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.

[0182] 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 proposed in 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 proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0183] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG1 , or a portion thereof, but are not limited thereto. The entities shown in FIG1 are illustrative only. The communication system may include all or part of the entities shown in FIG1 , or may include other entities outside of FIG1 . The number and form of the entities are arbitrary, and the entities may be physical or virtual. The connection relationships between the entities are illustrative only. The entities may be connected or disconnected, and the connection may be in any manner, including direct or indirect, wired or wireless.

[0184] 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 communication methods, and next-generation systems based on and extending these methods. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0185] It's important to note that with the increasing demand for speed, latency, high-speed mobility, and energy efficiency, coupled with the increasing diversity and complexity of future services, the 3GPP (3rd Generation Partnership Project) international standards organization has begun developing 5G. The main application scenarios for 5G are: enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine-type communications (mMTC). eMBB continues to focus on providing users with multimedia content, services, and data, and demand for it is growing rapidly. However, since eMBB can be deployed in diverse scenarios, such as indoors, in urban areas, and in rural areas, its capabilities and requirements vary significantly, making a generalized approach difficult and requiring detailed analysis based on specific deployment scenarios. Typical applications of URLLC include industrial automation, power automation, remote medical operations (surgery), and traffic safety. mMTC's key features include high connection density, low data volumes, latency-insensitive services, low module costs, and a long service life.

[0186] Since the energy consumption of 5G base stations is four times that of LTE base stations, network energy saving is an important means for operators to reduce the cost of operating 5G systems. In some embodiments, in order to save energy for terminals in the RRC connected state (RRC_CONNECTED), a WUS (wake up signal) is introduced. An offset in front of the on duration of UE C-DRX (Connected Discontinuous Reception) defines a duration for sending a WUS signal. During this WUS duration, a WUS signal, i.e., DCI 2-6, is sent, which is encrypted by PS-RNTI (Power Saving RNTI) to indicate whether the terminal wakes up to monitor PDCCH (Physical Downlink Control Channel) during the next UE C-DRX onduration.

[0187] In some embodiments, a paging wake-up signal (WUS) is introduced to save energy for terminals in RRC_IDLE / INACTIVE states. This WUS, also known as the Paging Early Indication (PEI), is sent sometime before a paging occasion (PO) to indicate whether the terminal is monitoring paging schedule information at that PO. The PEI is DCI 2-7, scrambled using the PEI-RNTI (Paging Early Indication Radio Network Temporary Identifier).

[0188] In some embodiments, the Network Energy Saving cell (NES cell) in this document may refer to an SSB / SIB1-less cell. The SSB / SIB1-less cell does not send SSB (Synchronization Signal Block), SIB (System Information Block) 1, other SIB, or paging, but the terminal can initiate a RACH (Random Access Channel) process to the SSB / SIB1-less cell. The SSB / SIB1-less cell does not send SSB, and SIB1 can be broadcast configured through an associated cell (anchor cell). At the same time, the deployment of SSB / SIB1-less cells makes network deployment more flexible, because the SSB / SIB1-less cell does not change the network coverage, it only provides data services and expands system capacity, so the SSB / SIB1-less cell can be quickly deployed, quickly used, flexibly deployed, and enabled on demand, that is, "plug and play", which improves the flexibility and timeliness of network deployment.

[0189] In some embodiments, when an upper layer requests to establish an RRC connection, the terminal initiates the RRC connection establishment process, and the terminal is in the RRC_IDLE state and it has obtained the necessary system information, and an RRC connection establishment request (RRCSetupRequest) message is used to request the establishment of an RRC connection. The RRCSetupRequest message carries a cause value, which indicates the reason why the network device established the RRC connection through establishmentCause. If the establishment of the RRC connection is the result of a redirection release with mpsPriorityIndication (Multimedia Priority Service MPS Priority Indication), the terminal device sets establishmentCause to mps-PriorityAccess, otherwise it sets establishmentCause according to the instructions of the upper layer.

[0190] Establishing an RRC connection involves establishing SRB1. The network completes the RRC connection establishment before completing the NG connection, that is, before receiving UE context information from the 5G Core (5G Core). Therefore, AS (Access Stratum) security is not activated during the initial phase of the RRC connection. After receiving the UE context from the 5GC, the RAN activates AS security (encryption and integrity protection) using the initial AS security activation procedure. The RRC message activating AS security is integrity-protected, and encryption only begins after the procedure is completed. That is, the response message for AS security activation is not encrypted, while subsequent messages (such as those for establishing SRB2, DRB, and multicast MRB) are integrity-protected and encrypted. After the initial AS security activation procedure is completed, the network can initiate the establishment of SRB2 and DRB. SRB1 is used for RRC messages and NAS messages before establishing SRB2, all of which use the DCCH (Dedicated Control Channel) logical channel; SRB2 is used for NAS messages and RRC messages, including logged measurement information, all of which use the DCCH logical channel. SRB2 has a lower priority than SRB1 and can be configured by the network after AS security is activated.

[0191] Redirection in LTE means that the system indicates the target cell information through the redirection indication information (redirectedCarrierInfo) in the RRC Connection Release (RRCConnectionRelease) message. After leaving the connected state, the UE will try to reside in the specified system / frequency and re-initiate access based on the target cell information. Redirection does not have a handover preparation process. UE redirection is usually a transitional measure prepared for UEs that do not support handover. The UE is in the RRC connected state and receives an RRC connection release message, but the release message contains redirection information (the release message contains a frequency). After the UE connection is released, it will search for cells, and the search frequency is the frequency contained in the release message. The main difference between redirection and handover is that the target cell does not conduct any signaling communication with the source cell, nor does it perform any access preparation in the target cell. Its random access process is a competitive random access. There is no direct interface between the source cell and the target cell.

[0192] NR also supports redirection, using a mechanism similar to that used in LTE. If a UE is redirected to an NR frequency, it will perform a cell search after the connection is released. The search frequency is the same as the frequency included in the release message. The Smtc (SSB measurement timing configuration) specifies the timing for the UE to measure SSBs on the redirected frequency.

[0193] Based on the redirection technology, the UE can access the SSB / SIB1-less cell (NES cell). However, there is currently a lack of effective means for redirecting the terminal to the SSB / SIB1-less cell to initiate random access on the SSB / SIB1-less cell.

[0194] To this end, the embodiments of the present disclosure provide an initial access method and device thereof, which can redirect the terminal to a network energy-saving cell to initiate random access on the network energy-saving cell, thereby achieving the purpose of operators reducing the cost of operating 5G systems and realizing network energy-saving effects.

[0195] FIG2A is an interactive diagram of an initial access method according to an embodiment of the present disclosure. As shown in FIG2A , the initial access method according to an embodiment of the present disclosure can be applied to a communication system 100, and the method includes but is not limited to the following steps.

[0196] In step S2101 , the terminal 101 sends an RRC connection establishment request message to the anchor cell 102 .

[0197] In some embodiments, the RRC connection establishment request message may be sent by the terminal 101 to the anchor cell 102. Optionally, the terminal 101 sends the RRC connection establishment request message to the anchor cell 102. Exemplarily, the anchor cell 102 receives the RRC connection establishment request message, for example, the anchor cell 102 receives the RRC connection establishment request message sent by the terminal 101.

[0198] In some embodiments, the RRC connection establishment request message is used to request establishment of an RRC connection with the anchor cell 102, wherein the RRC connection establishment request message may include a first cause value, and the first cause value indicates that the terminal 101 needs to be redirected to the first network energy-saving cell. Exemplarily, the first cause value indicates that the reason for the terminal 101 to establish the RRC connection is that the terminal 101 needs to be redirected to the first network energy-saving cell.

[0199] Exemplarily, the first cause value may be a newly defined cause value (cause value) in the standard protocol. For example, the first cause value may be named nes-PriorityAccess. Exemplarily, the new cause value (i.e., the first cause value) may also have other naming forms, which are not specifically limited in this disclosure. The first cause value is used to indicate the anchor cell 102 that the reason for the terminal 101 to establish the RRC connection this time is to redirect to the first network energy-saving cell.

[0200] Exemplarily, terminal 101 establishes an RRC connection on anchor cell 102 so that anchor cell 102 redirects terminal 101 to the first network energy-saving cell. That is, the purpose of terminal 101 establishing an RRC connection on anchor cell 102 is to enable anchor cell 102 to redirect terminal 101 to the first network energy-saving cell. The establishment cause (establishmentcause) of the setuprequest message sent by terminal 101 on anchor cell 102 is set to the new cause value, that is, the first cause value.

[0201] In some embodiments, the first network energy-saving cell may be an SSB / SIB1-less cell (also called an NES cell). The SSB / SIB1-less cell does not send SSB, SIB1, other SIBs, or paging, but the terminal can initiate a RACH process to the SSB / SIB1-less cell. The SSB / SIB1-less cell does not send SSB, and SIB1 can be broadcasted through an associated cell (also called an anchor cell) to configure it.

[0202] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0203] In some embodiments, the first network energy-saving cell and the anchor cell 102 are neighbors. For example, the first network energy-saving cell and the anchor cell 102 have overlapping coverage or adjacent coverage, that is, the first network energy-saving cell and the anchor cell 102 are neighbors.

[0204] In some embodiments, the first cause value further indicates that the anchor cell 102 establishes an SRB1 (signaling radio bearer of type 1) and / or performs an initial security activation process for the terminal 101, and / or does not establish an SRB2 (signaling radio bearer of type 2) and / or a DRB (data radio bearer) for the terminal 101. Exemplarily, the terminal 101 sets establishmentcause to a new cause value, that is, the terminal 101 sets the establishment cause to the first cause value, which can be used to further indicate that the anchor cell 102 only needs to establish SRB1 and / or security activation for the terminal 101, and does not need the anchor cell 102 to establish SRB2 and / or DRB for the terminal 101.

[0205] In step S2102 , after establishing an RRC connection on the anchor cell 102 , the terminal 101 sends a redirection request message.

[0206] In some embodiments, after establishing an RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, the anchor cell 102 receives the redirection request message sent by the terminal 101 after establishing the RRC connection on the anchor cell 102.

[0207] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0208] In some embodiments, after the terminal 101 establishes an RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102 via RRC signaling. For example, the RRC signaling can be named nes-RedirectRequest. For example, the RRC signaling can also have other naming forms, which are not specifically limited in this disclosure.

[0209] Step S2103: The anchor cell 102 determines, based on the first cause value, that the terminal 101 needs to be redirected to the first network energy-saving cell.

[0210] In some embodiments, the first cause value is included in the RRC connection establishment request message, which is sent by terminal 101 to anchor cell 102. The first cause value indicates that the reason for terminal 101 to establish the RRC connection is that it needs to be redirected to the first network energy-saving cell. Upon receiving the RRC connection establishment request message sent by terminal 101, anchor cell 102 may determine that terminal 101 needs to be redirected to the first network energy-saving cell based on the first cause value in the RRC connection establishment request message.

[0211] Step S2104: The anchor cell 102 sends indication information.

[0212] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the anchor cell 102 sends the indication information to the terminal 101. Exemplarily, after establishing an RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the first cause value of the RRC connection establishment request message and / or the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0213] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0214] In some embodiments, the above-mentioned indication information may be sent by the anchor cell 102 to the terminal 101 via an RRC Connection Release (RRCConnectionRelease) message. Exemplarily, the anchor cell 102 sends the RRC Connection Release message to the terminal 101. For example, the terminal 101 may receive the RRC Connection Release message sent by the anchor cell 102. The RRC Connection Release message is used to instruct the terminal 101 to release the RRC connection. The RRC Connection Release message may include the above-mentioned indication information. Exemplarily, the RRC Connection Release message may include redirection indication information, and the redirection indication information includes the above-mentioned indication information.

[0215] Exemplarily, the redirection indication information may be redirectedCarrierInfo (redirection frequency information). Alternatively, exemplary, the redirection indication information may be CarrierInfoNR, which is not specifically limited in this disclosure. Exemplarily, the redirection indication information may be carried by an RRC connection release message.

[0216] In some embodiments, the indication information includes at least one of the following: information indicating the identifier of the redirecting cell; information indicating the frequency of the redirecting cell; and information indicating whether the redirecting cell is a network energy-saving cell. Exemplarily, the indication information may include information indicating the identifier of the redirecting cell. Alternatively, the indication information may include information indicating the frequency of the redirecting cell. Alternatively, the indication information may include information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell and information indicating the frequency of the redirecting cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell and information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the frequency of the redirecting cell and information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell, information indicating the frequency of the redirecting cell, and information indicating whether the redirecting cell is a network energy-saving cell.

[0217] Exemplarily, the identification of the above-mentioned cell may be the identification information of the cell, for example, the identification information of the cell may be at least one of the following: PCI (Physical Cell Identifier), cell identity, RNAC (Radio Notification Area Code), TAC (Tracking Area Code), etc.

[0218] Exemplarily, the above-mentioned frequency may be the frequency information of the cell. For example, the above-mentioned frequency may be at least one of the following: a frequency layer, a frequency of SSB, a frequency of UL WUS (uplink wake-up signal), etc.

[0219] Exemplarily, whether the redirected cell is a network energy-saving cell (SSB / SIB1-lesscell, also called NEScell) can be indicated by a bit, and the data type of the bit is BOOLEAN. Exemplarily, if the value of the bit is "true", it indicates that the redirected cell is a network energy-saving cell, otherwise it indicates that the redirected cell is not a network energy-saving cell. For example, if the value of the bit is "false", it indicates that the redirected cell is not a network energy-saving cell, and the terminal is redirected to the corresponding cell according to the existing redirection process. For example, the terminal 101 is in the RRC connection state and receives an RRC connection release message, but the release message contains redirection information (the release message contains a frequency point). After the connection is released, the terminal 101 needs to search for a cell, and the search frequency point is the frequency point contained in the release message. Exemplarily, the value type of the third indication field can also be other types, such as a bit value. For example, if the value of the third indication field is 1, it is determined that the redirected cell is a network energy-saving cell, or other types can be used. This disclosure does not specifically limit this and will not be repeated.

[0220] In step S2105 , the anchor cell 102 establishes SRB1 for the terminal 101 and / or performs an initial security activation process, and / or does not establish SRB2 and / or DRB for the terminal 101 .

[0221] In some embodiments, the first cause value further indicates that the anchor cell 102 establishes SRB1 (signaling radio bearer of type 1) and / or performs an initial security activation process for the terminal 101, and / or does not establish SRB2 (signaling radio bearer of type 2) and / or DRB (data radio bearer) for the terminal 101. The first cause value is included in the RRC connection establishment request message. Exemplarily, the first cause value further indicates that the anchor cell 102 establishes SRB1 and / or performs an initial security activation process for the terminal 101, and does not establish SRB2 and / or DRB for the terminal 101. After receiving the RRC connection establishment request message, the anchor cell 102 determines that it is necessary to establish SRB1 and / or perform an initial security activation process for the terminal 101 based on the first cause value in the RRC connection establishment request message, and does not establish SRB2 and / or DRB for the terminal 101. That is to say, after receiving the RRC connection establishment request message sent by the terminal 101, the anchor cell 102 determines that the establishmentcause is set to the new cause value (that is, the first cause value mentioned above), and the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell. The anchor cell 102 establishes SRB1 and / or security activation for the terminal 101, and does not establish SRB2 and / or DRB for the terminal 101.

[0222] Exemplarily, the above-mentioned first cause value also indicates that the anchor cell 102 establishes SRB1 and / or performs an initial security activation process for the terminal 101. After receiving the RRC connection establishment request message, the anchor cell 102 determines that it is necessary to establish SRB1 and / or perform an initial security activation process for the terminal 101 based on the first cause value in the RRC connection establishment request message.

[0223] Exemplarily, the above-mentioned first cause value also indicates that the anchor cell 102 does not establish SRB2 and / or DRB for the terminal 101. After receiving the RRC connection establishment request message, the anchor cell 102 determines that it is not necessary to establish SRB2 and / or DRB for the terminal 101 based on the first cause value in the RRC connection establishment request message.

[0224] Step S2106: The anchor cell 102 sends SIB information.

[0225] In some embodiments, the anchor cell 102 sends SIB information to the terminal 101, wherein the SIB information may include configuration information of one or more network energy-saving cells, and the anchor cell associated with the one or more network energy-saving cells is the anchor cell 102; the SIB information is used by the terminal 101 to obtain the configuration information of the first network energy-saving cell in combination with the above-mentioned indication information, and the configuration information of the first network energy-saving cell is used by the terminal 101 to initiate a random access process on the first network energy-saving cell.

[0226] Exemplarily, the configuration information of the one or more network energy-saving cells may be configured in the SIB1 of the anchor cell 102 or in a newly defined SIB. Exemplarily, the anchor cell 102 may broadcast the configuration information of the one or more network energy-saving cells. The configuration information of the network energy-saving cells may include identification information of the network energy-saving cells and other configuration information. The identification information of the network energy-saving cells may be at least one of the following: PCI, cell identity, RNAC, TAC, etc. The other configuration information may include, for example, RACH-related configuration information and / or other information in the existing SIB1.

[0227] Step S2107: Terminal 101 obtains configuration information of the first network energy-saving cell.

[0228] In some embodiments, the terminal 101 obtains the configuration information of the first network energy-saving cell according to the above-mentioned indication information and / or the SIB information of the anchor cell 102. In some embodiments, the terminal 101 obtains the configuration information of the first network energy-saving cell, including at least one of the following:

[0229] Obtain system information block SIB information of the anchor cell, where the SIB information includes configuration information of one or more network energy-saving cells, and obtain the configuration information of the first network energy-saving cell in the SIB information according to the indication information and the SIB information; obtain the SIB information of the anchor cell, and obtain the configuration information of the first network energy-saving cell according to the SIB information of the anchor cell; obtain the configuration information of the first network energy-saving cell according to the indication information; obtain the configuration of the first network energy-saving cell according to the indication information and / or the system information block SIB information of the anchor cell.

[0230] In some embodiments, terminal 101 determines, based on the above-mentioned indication information, that the cell to which terminal 101 needs to be redirected is a network energy-saving cell. Terminal 101 obtains, based on the above-mentioned indication information, the cell identifier and / or frequency to which terminal 101 needs to be redirected. Terminal 101 determines, from the configuration information of one or more network energy-saving cells in the SIB information of anchor cell 102, the configuration information of the network energy-saving cell associated with the cell identifier and / or frequency to which terminal 101 needs to be redirected as the configuration information of the first network energy-saving cell.

[0231] Exemplarily, the above-mentioned indication information may include information indicating an identifier of the redirected cell, information indicating a frequency of the redirected cell, and information indicating whether the redirected cell is a network energy-saving cell. Based on the indication information, the terminal 101 determines that the redirected cell is a network energy-saving cell, and based on the above-mentioned indication information, obtains the identifier and / or frequency of the redirected cell, and determines the configuration information of the network energy-saving cell associated with the identifier and / or frequency as the configuration information of the first network energy-saving cell in the SIB information of the anchor cell 102.

[0232] Exemplarily, the terminal 101 obtains the cell identifier and / or frequency of the first network energy-saving cell through the above indication information, and determines the configuration information of the first network energy-saving cell associated with the cell identifier and / or frequency of the first network energy-saving cell in the system message broadcast by the anchor cell 102.

[0233] In some embodiments, the configuration information of the first network energy-saving cell includes at least one of the following: an identifier and / or frequency of the first network energy-saving cell; RACH-related configuration information of the first network energy-saving cell; and information in the SRB1 of the first network energy-saving cell. Exemplarily, the configuration information of the first network energy-saving cell includes the identifier and / or frequency of the first network energy-saving cell. Alternatively, the configuration information of the first network energy-saving cell includes the RACH-related configuration information of the first network energy-saving cell. Alternatively, the configuration information of the first network energy-saving cell includes the information in the SRB1 of the first network energy-saving cell. Alternatively, the configuration information of the first network energy-saving cell includes the identifier and / or frequency of the first network energy-saving cell and the RACH-related configuration information of the first network energy-saving cell. Alternatively, the configuration information of the first network energy-saving cell includes the identifier and / or frequency of the first network energy-saving cell and the information in the SRB1 of the first network energy-saving cell. Alternatively, the configuration information of the first network energy-saving cell includes the RACH-related configuration information of the first network energy-saving cell and the information in the SRB1 of the first network energy-saving cell. Alternatively, the configuration information of the first network energy-saving cell includes an identifier and / or frequency of the first network energy-saving cell, RACH-related configuration information of the first network energy-saving cell, and information in SRB1 of the first network energy-saving cell.

[0234] Step S2108: The terminal 101 initiates a random access process on the first network energy-saving cell according to the configuration information of the first network energy-saving cell.

[0235] Exemplarily, the terminal 101 initiates a random access process on the first network energy-saving cell according to the acquired configuration information of the first network energy-saving cell, and accesses the first network energy-saving cell.

[0236] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codeword", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0237] In some embodiments, terms such as "uplink", "uplink", "physical uplink" can be interchangeable with each other, and terms such as "downlink", "downlink", "physical downlink" can be interchangeable with each other, and terms such as "side", "sidelink", "side communication", "sidelink communication", "direct connection", "direct link", "direct communication", "direct link communication" can be interchangeable with each other.

[0238] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0239] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0240] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "some", "any", and "first" can be interchangeable. "Specific A", "preset A", "preset A", "setting A", "indicated A", "some A", "any A", and "first A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, some A, any A, or first A, etc., but not limited to this.

[0241] In some embodiments, the determination or judgment can be performed by a value represented by 1 bit (0 or 1), or by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a predetermined value), but is not limited thereto.

[0242] The method involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2108. For example, step S2104, step S2107, and step S2108 can be implemented as an independent embodiment, step S2101, step S2104, step S2107, and step S2108 can be implemented as an independent embodiment, step S2104, step S2105, step S2107, and step S2108 can be implemented as an independent embodiment, and step S2104, step S2105, step S2106, step S2107, and step S2108 can be implemented as an independent embodiment, but the present invention is not limited thereto.

[0243] In some embodiments, step S2104 and step S2105 may be executed in an interchanged order or simultaneously.

[0244] In some embodiments, step S2102 is optional, and one or more of these steps may be omitted or replaced in different embodiments. Exemplarily, when the terminal 101 sends an RRC connection establishment request message to the anchor cell 102, the RRC connection establishment request message carries a first cause value, and the first cause value indicates that the terminal 101 needs to be redirected to the first network energy-saving cell. Since the first cause value in the RRC connection establishment request message indicates that the terminal 101 needs to be redirected to the first network energy-saving cell, when the anchor cell 102 receives the RRC connection establishment request message, it can determine that the terminal 101 needs to be redirected to the first network energy-saving cell. Therefore, after the terminal 101 establishes an RRC connection on the anchor cell 102, it is not necessary to send the above-mentioned redirection request message to the anchor cell 102. When the anchor cell receives the RRC connection establishment request message carrying the above-mentioned first cause value, it can send indication information and / or SIB information to the terminal 101. Alternatively, after establishing an RRC connection on the anchor cell 102, the terminal 101 may also send the redirection request message to the anchor cell 102. After receiving the redirection request, the anchor cell 102 sends indication information and / or SIB information to the terminal 101. The terminal 101 may obtain the configuration information of the first network energy-saving cell based on the indication information and / or the SIB information of the anchor cell 102, and initiate a random access process on the first network energy-saving cell based on the configuration information of the first network energy-saving cell.

[0245] In some embodiments, step S2103, step S2104, step S2105, and step S2106 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0246] In some embodiments, step S2101, step S2102, step S2107, and step S2108 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0247] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2A .

[0248] Figure 2B is an interactive diagram of an initial access method according to an embodiment of the present disclosure. As shown in Figure 2B, the initial access method according to an embodiment of the present disclosure can be applied to a communication system 100, and the method includes but is not limited to the following steps.

[0249] In step S2201 , the terminal 101 sends an RRC connection establishment request message to the anchor cell 102 .

[0250] In some embodiments, the RRC connection establishment request message may be sent by the terminal 101 to the anchor cell 102. Optionally, the terminal 101 sends the RRC connection establishment request message to the anchor cell 102. Exemplarily, the anchor cell 102 receives the RRC connection establishment request message, for example, the anchor cell 102 receives the RRC connection establishment request message sent by the terminal 101.

[0251] In some embodiments, the RRC connection establishment request message is used to request to establish an RRC connection with the anchor cell 102, wherein the RRC connection establishment request message includes a second cause value.

[0252] In some embodiments, the first network energy-saving cell may be an SSB / SIB1-less cell (also called an NES cell). The SSB / SIB1-less cell does not send SSB, SIB1, other SIBs, or paging, but the terminal can initiate a RACH process to the SSB / SIB1-less cell. The SSB / SIB1-less cell does not send SSB, and SIB1 can be broadcasted through an associated cell (also called an anchor cell) to configure it.

[0253] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0254] In some embodiments, the first network energy-saving cell and the anchor cell 102 are neighbors. For example, the first network energy-saving cell and the anchor cell 102 have overlapping coverage or adjacent coverage, that is, the first network energy-saving cell and the anchor cell 102 are neighbors.

[0255] In some embodiments, the second cause value may be an RRC connection establishment cause value selected from at least one existing RRC connection establishment cause value by a higher layer or an AS layer of the terminal 101. Exemplarily, the terminal 101 selects an RRC connection establishment cause value from at least one existing RRC connection establishment cause value according to the higher layer or the access layer AS layer of the terminal 101 and determines it as the second cause value.

[0256] Exemplarily, the purpose of the terminal 101 establishing an RRC connection on the anchor cell 102 is to allow the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell. The establishmentcause of the RRC connection establishment request message sent by the terminal 101 on the anchor cell 102 is set to the existing cause value (i.e., the above-mentioned second cause value). The terminal 101 selects one from the existing cause values ​​according to the implementation. Exemplarily, it can be a high-level implementation of the terminal 101 or an AS layer implementation of the terminal 101.

[0257] In some embodiments, the at least one existing RRC connection establishment cause value includes at least one of the following: emergency; highPriorityAccess; called access (mt-Access); mo-Signalling; mo-Data; and delay-tolerant access (delayTolerantAccess). Exemplarily, the establishmentcause of the RRC connection establishment request message sent by terminal 101 on anchor cell 102 is set to any one of the following cause values: emergency, highPriorityAccess, mt-Access, mo-Signalling, or mo-DatadelayTolerantAccess.

[0258] In step S2202 , after establishing an RRC connection on the anchor cell 102 , the terminal 101 sends a redirection request message.

[0259] In some embodiments, after establishing an RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, the anchor cell 102 receives the redirection request message sent by the terminal 101 after establishing the RRC connection on the anchor cell 102.

[0260] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0261] In some embodiments, after the terminal 101 establishes an RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102 via RRC signaling. For example, the RRC signaling can be named nes-RedirectRequest. For example, the RRC signaling can also have other naming forms, which are not specifically limited in this disclosure.

[0262] Step S2203 : The anchor cell 102 determines, based on the redirection request message, that the terminal 101 needs to be redirected to the first network energy-saving cell.

[0263] Exemplarily, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell. After receiving the redirection request message, the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell.

[0264] Step S2204: The anchor cell 102 sends indication information.

[0265] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the anchor cell 102 sends the indication information to the terminal 101. Exemplarily, after the terminal 101 establishes an RRC connection on the anchor cell 102, it sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0266] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0267] In some embodiments, the above-mentioned indication information may be sent by the anchor cell 102 to the terminal 101 through an RRC connection release message. Exemplarily, the anchor cell 102 sends the RRC connection release message to the terminal 101. For example, the terminal 101 may receive the RRC connection release message sent by the anchor cell 102. The RRC connection release message is used to instruct the terminal 101 to release the RRC connection. The RRC connection release message may include redirection indication information, and the redirection indication information includes the above-mentioned indication information.

[0268] Exemplarily, the redirection indication information may be redirectedCarrierInfo (redirection frequency information). Alternatively, exemplary, the redirection indication information may be CarrierInfoNR, which is not specifically limited in this disclosure. Exemplarily, the redirection indication information may be carried by an RRC connection release message.

[0269] In some embodiments, the indication information includes at least one of the following: information indicating the identifier of the redirecting cell; information indicating the frequency of the redirecting cell; and information indicating whether the redirecting cell is a network energy-saving cell. Exemplarily, the indication information may include information indicating the identifier of the redirecting cell. Alternatively, the indication information may include information indicating the frequency of the redirecting cell. Alternatively, the indication information may include information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell and information indicating the frequency of the redirecting cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell and information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the frequency of the redirecting cell and information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell, information indicating the frequency of the redirecting cell, and information indicating whether the redirecting cell is a network energy-saving cell.

[0270] Exemplarily, the above-mentioned cell identifier may be identification information of the cell, for example, the identification information of the cell may be at least one of the following: PCI, cell identity, RNAC, TAC, etc.

[0271] Exemplarily, the above-mentioned frequency may be the frequency information of the cell. For example, the above-mentioned frequency may be at least one of the following: a frequency layer, a frequency of SSB, a frequency of UL WUS (uplink wake-up signal), etc.

[0272] Exemplarily, whether the redirected cell is a network energy-saving cell (SSB / SIB1-less cell, also called NEScell) can be indicated by a bit, where the data type of the bit is a Boolean. Exemplarily, if the value of the bit is "true", it indicates that the redirected cell is a network energy-saving cell; otherwise, it indicates that the redirected cell is not a network energy-saving cell. For example, if the value of the bit is "false", it indicates that the redirected cell is not a network energy-saving cell.

[0273] Step S2205: The anchor cell 102 sends SIB information.

[0274] In some embodiments, the anchor cell 102 sends SIB information to the terminal, wherein the SIB information includes configuration information of one or more network energy-saving cells, and the anchor cell associated with the one or more network energy-saving cells is the anchor cell 102; the SIB information is used by the terminal 101 to obtain the configuration information of the first network energy-saving cell in combination with the indication information, and the configuration information of the first network energy-saving cell is used by the terminal 101 to initiate a random access process on the first network energy-saving cell.

[0275] The optional implementation of step S2205 can refer to the optional implementation of step S2106 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0276] Step S2206: Terminal 101 obtains configuration information of the first network energy-saving cell.

[0277] The optional implementation of step S2206 can refer to the optional implementation of step S2107 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0278] Step S2207: The terminal 101 initiates a random access process on the first network energy-saving cell according to the configuration information of the first network energy-saving cell.

[0279] The optional implementation of step S2207 can refer to the optional implementation of step S2108 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0280] The method according to the embodiments of the present disclosure may include at least one of steps S2201 to S2207. For example, steps S2202, S2206, and S2207 may be implemented as independent embodiments, steps S2201, S2202, S2206, and S2207 may be implemented as independent embodiments, and steps S2203, S2204, and S2205 may be implemented as independent embodiments, but are not limited thereto.

[0281] In some embodiments, step S2201, step S2203, step S2204, and step S2205 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0282] In some embodiments, step S2203, step S2204, and step S2205 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0283] In some embodiments, step S2201, step S2202, step S2206, and step S2207 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0284] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2B .

[0285] Figure 2C is an interactive diagram of an initial access method according to an embodiment of the present disclosure. As shown in Figure 2C, the initial access method according to an embodiment of the present disclosure can be applied to the communication system 100, and the method includes but is not limited to the following steps.

[0286] In step S2301 , the terminal 101 sends an RRC connection recovery request message to the anchor cell 102 .

[0287] In some embodiments, the RRC connection restoration request message may be sent by the terminal 101 to the anchor cell 102. Optionally, the terminal 101 sends the RRC connection restoration request message to the anchor cell 102. Exemplarily, the anchor cell 102 receives the RRC connection restoration request message, for example, the anchor cell 102 receives the RRC connection restoration request message sent by the terminal 101.

[0288] In some embodiments, the RRC connection restoration request message is used to request restoration of an RRC connection suspended in the anchor cell 102, wherein the RRC connection restoration request message may include a first cause value, and the first cause value indicates that the terminal 101 needs to be redirected to the first network energy-saving cell. Exemplarily, the first cause value indicates that the reason why the terminal 101 restores the RRC connection suspended in the anchor cell 102 is that redirection to the first network energy-saving cell is required.

[0289] Exemplarily, the first cause value may be a newly defined cause value (cause value) in the standard protocol. For example, the first cause value may be named nes-PriorityAccess. Exemplarily, the new cause value (i.e., the first cause value) may also have other naming forms, which are not specifically limited in this disclosure. The first cause value is used to indicate the anchor cell 102, and the reason for the terminal 101 to restore the RRC connection this time is to redirect to the first network energy-saving cell.

[0290] Exemplarily, terminal 101 restores the RRC connection on anchor cell 102 so that anchor cell 102 redirects terminal 101 to the first network energy-saving cell. That is, the purpose of terminal 101 restoring the RRC connection suspended on anchor cell 102 is to allow anchor cell 102 to redirect terminal 101 to the first network energy-saving cell. The recovery cause of the recovery request message sent by terminal 101 on anchor cell 102 is set to the new cause value, i.e., the first cause value.

[0291] In some embodiments, the first network energy-saving cell may be an SSB / SIB1-less cell (also called an NES cell). The SSB / SIB1-less cell does not send SSB, SIB1, other SIBs, or paging, but the terminal can initiate a RACH process to the SSB / SIB1-less cell. The SSB / SIB1-less cell does not send SSB, and SIB1 can be broadcasted through an associated cell (also called an anchor cell) to configure it.

[0292] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0293] In some embodiments, the first network energy-saving cell and the anchor cell 102 are neighbors. For example, the first network energy-saving cell and the anchor cell 102 have overlapping coverage or adjacent coverage, that is, the first network energy-saving cell and the anchor cell 102 are neighbors.

[0294] In some embodiments, the first cause value further instructs the anchor cell 102 to establish SRB1 and / or perform an initial security activation process for the terminal 101, and / or not to establish SRB2 and / or DRB for the terminal 101. Exemplarily, the terminal 101 sets the restoration cause value to a new cause value, that is, the terminal 101 sets the restoration cause to the first cause value, which can be used to further indicate that the anchor cell 102 only needs to establish SRB1 and / or security activation for the terminal 101, and does not need the anchor cell 102 to establish SRB2 and / or DRB for the terminal 101.

[0295] In step S2302 , after restoring the RRC connection on the anchor cell 102 , the terminal 101 sends a redirection request message.

[0296] In some embodiments, after the terminal 101 resumes the RRC connection on the anchor cell 102 (i.e., the terminal 101 resumes the RRC connection suspended on the anchor cell 102), the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, the anchor cell 102 receives the redirection request message sent by the terminal 101 after the RRC connection is resumed on the anchor cell 102.

[0297] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0298] In some embodiments, after the terminal 101 resumes the RRC connection suspended on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102 via RRC signaling. Exemplarily, the RRC signaling may be named nes-RedirectRequest. Exemplarily, the RRC signaling may also have other naming forms, which are not specifically limited in this disclosure.

[0299] Step S2303: The anchor cell 102 determines, based on the first cause value, that the terminal 101 needs to be redirected to the first network energy-saving cell.

[0300] In some embodiments, the first cause value is included in the RRC connection restoration request message, which is sent by terminal 101 to anchor cell 102. The first cause value indicates that the reason for terminal 101 to restore the RRC connection is that redirection to the first network energy-saving cell is required. Upon receiving the RRC connection restoration request message sent by terminal 101, anchor cell 102 may determine that terminal 101 needs to be redirected to the first network energy-saving cell based on the first cause value in the RRC connection restoration request message and / or the redirection request message.

[0301] Step S2304: The anchor cell 102 sends indication information.

[0302] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the anchor cell 102 sends the indication information to the terminal 101. Exemplarily, after restoring the RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the first cause value of the RRC connection restoration request message and / or the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0303] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0304] In some embodiments, the above-mentioned indication information may be sent by the anchor cell 102 to the terminal 101 via an RRC Connection Release (RRCConnectionRelease) message. Exemplarily, the anchor cell 102 sends the RRC Connection Release message to the terminal 101. For example, the terminal 101 may receive the RRC Connection Release message sent by the anchor cell 102. The RRC Connection Release message is used to instruct the terminal 101 to release the RRC connection. The RRC Connection Release message may include the above-mentioned indication information. Exemplarily, the RRC Connection Release message may include redirection indication information, and the redirection indication information includes the above-mentioned indication information.

[0305] Exemplarily, the redirection indication information may be redirectedCarrierInfo (redirection frequency information). Alternatively, exemplary, the redirection indication information may be CarrierInfoNR, which is not specifically limited in this disclosure. Exemplarily, the redirection indication information may be carried by an RRC connection release message.

[0306] In some embodiments, the indication information includes at least one of the following: information indicating the identifier of the redirecting cell; information indicating the frequency of the redirecting cell; and information indicating whether the redirecting cell is a network energy-saving cell. Exemplarily, the indication information may include information indicating the identifier of the redirecting cell. Alternatively, the indication information may include information indicating the frequency of the redirecting cell. Alternatively, the indication information may include information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell and information indicating the frequency of the redirecting cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell and information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the frequency of the redirecting cell and information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell, information indicating the frequency of the redirecting cell, and information indicating whether the redirecting cell is a network energy-saving cell.

[0307] Exemplarily, the above-mentioned cell identifier may be identification information of the cell, for example, the identification information of the cell may be at least one of the following: PCI, cell identity, RNAC, TAC, etc.

[0308] Exemplarily, the above-mentioned frequency may be the frequency information of the cell. For example, the above-mentioned frequency may be at least one of the following: a frequency layer, a frequency of SSB, a frequency of UL WUS, etc.

[0309] Exemplarily, whether the redirected cell is a network energy-saving cell (SSB / SIB1-less cell, also called an NES cell) can be indicated by a bit, the data type of which is a BOOLEAN type. Exemplarily, if the value of this bit is "true", it indicates that the redirected cell is a network energy-saving cell; otherwise, it indicates that the redirected cell is not a network energy-saving cell. For example, if the value of this bit is "false", it indicates that the redirected cell is not a network energy-saving cell.

[0310] In step S2305 , the anchor cell 102 establishes SRB1 for the terminal 101 and / or performs an initial security activation process, and / or does not establish SRB2 and / or DRB for the terminal 101 .

[0311] In some embodiments, the above-mentioned first cause value also indicates that the anchor cell 102 establishes SRB1 (signaling radio bearer of type 1) and / or performs an initial security activation process for the terminal 101, and / or does not establish SRB2 (signaling radio bearer of type 2) and / or DRB (data radio bearer) for the terminal 101. The above-mentioned first cause value is included in the RRC connection recovery request message. Exemplarily, the above-mentioned first cause value also indicates that the anchor cell 102 establishes SRB1 and / or performs an initial security activation process for the terminal 101, and does not establish SRB2 and / or DRB for the terminal 101. After receiving the RRC connection recovery request message, the anchor cell 102 determines that it is necessary to establish SRB1 and / or perform an initial security activation process for the terminal 101 based on the first cause value in the RRC connection recovery request message, and does not establish SRB2 and / or DRB for the terminal 101. That is to say, after receiving the RRC connection recovery request message sent by the terminal 101, the anchor cell 102 determines that the recovery cause value is set to the new cause value (that is, the first cause value mentioned above), and the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell. The anchor cell 102 establishes SRB1 and / or security activation for the terminal 101, and does not establish SRB2 and / or DRB for the terminal 101.

[0312] Exemplarily, the above-mentioned first cause value also indicates that the anchor cell 102 establishes SRB1 and / or performs an initial security activation process for the terminal 101. After receiving the RRC connection recovery request message, the anchor cell 102 determines that it is necessary to establish SRB1 and / or perform an initial security activation process for the terminal 101 based on the first cause value in the RRC connection recovery request message.

[0313] Exemplarily, the above-mentioned first cause value also indicates that the anchor cell 102 does not establish SRB2 and / or DRB for the terminal 101. After receiving the RRC connection recovery request message, the anchor cell 102 determines that it is not necessary to establish SRB2 and / or DRB for the terminal 101 based on the first cause value in the RRC connection recovery request message.

[0314] Step S2306: The anchor cell 102 sends SIB information.

[0315] The optional implementation of step S2306 can refer to the optional implementation of step S2106 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0316] Step S2307: Terminal 101 obtains configuration information of the first network energy-saving cell.

[0317] The optional implementation of step S2307 can refer to the optional implementation of step S2107 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0318] Step S2308: The terminal 101 initiates a random access process on the first network energy-saving cell according to the configuration information of the first network energy-saving cell.

[0319] The optional implementation of step S2308 can refer to the optional implementation of step S2108 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0320] The method involved in the embodiments of the present disclosure may include at least one of steps S2301 to S2308. For example, step S2304, step S2307, and step S2308 can be implemented as an independent embodiment, step S2301, step S2304, step S2307, and step S2308 can be implemented as an independent embodiment, step S2304, step S2305, step S2307, and step S2308 can be implemented as an independent embodiment, and step S2304, step S2305, step S2306, step S2307, and step S2308 can be implemented as an independent embodiment, but the present invention is not limited thereto.

[0321] In some embodiments, step S2302 is optional, and one or more of these steps may be omitted or replaced in different embodiments. Exemplarily, when the terminal 101 sends an RRC connection recovery request message to the anchor cell 102, the RRC connection recovery request message carries a first cause value, and the first cause value indicates that the terminal 101 needs to be redirected to the first network energy-saving cell. Since the first cause value in the RRC connection recovery request message indicates that the terminal 101 needs to be redirected to the first network energy-saving cell, when the anchor cell 102 receives the RRC connection recovery request message, it can determine that the terminal 101 needs to be redirected to the first network energy-saving cell. Therefore, after the terminal 101 recovers the RRC connection on the anchor cell 102, it is not necessary to send the above-mentioned redirection request message to the anchor cell 102. When the anchor cell receives the RRC connection recovery request message carrying the above-mentioned first cause value, it can send indication information and / or SIB information to the terminal 101. Alternatively, after restoring the RRC connection on the anchor cell 102, the terminal 101 may also send the redirection request message to the anchor cell 102. After receiving the redirection request, the anchor cell 102 sends indication information and / or SIB information to the terminal 101. The terminal 101 may obtain the configuration information of the first network energy-saving cell based on the indication information and / or the SIB information of the anchor cell 102, and initiate a random access process on the first network energy-saving cell based on the configuration information of the first network energy-saving cell.

[0322] In some embodiments, step S2303, step S2304, step S2305, and step S2306 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0323] In some embodiments, step S2301, step S2302, step S2307, and step S2308 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0324] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2C .

[0325] Figure 2D is an interactive diagram of an initial access method according to an embodiment of the present disclosure. As shown in Figure 2D, the initial access method according to an embodiment of the present disclosure can be applied to the communication system 100, and the method includes but is not limited to the following steps.

[0326] Step S2401 : Terminal 101 sends an RRC connection recovery request message to anchor cell 102 .

[0327] In some embodiments, the RRC connection restoration request message may be sent by the terminal 101 to the anchor cell 102. Optionally, the terminal 101 sends the RRC connection restoration request message to the anchor cell 102. Exemplarily, the anchor cell 102 receives the RRC connection restoration request message, for example, the anchor cell 102 receives the RRC connection restoration request message sent by the terminal 101.

[0328] In some embodiments, the RRC connection restoration request message is used to request restoration of the RRC connection suspended in the anchor cell 102 , wherein the RRC connection restoration request message includes a second cause value.

[0329] In some embodiments, the first network energy-saving cell may be an SSB / SIB1-less cell (also called an NES cell). The SSB / SIB1-less cell does not send SSB, SIB1, other SIBs, or paging, but the terminal can initiate a RACH process to the SSB / SIB1-less cell. The SSB / SIB1-less cell does not send SSB, and SIB1 can be broadcasted through an associated cell (also called an anchor cell) to configure it.

[0330] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0331] In some embodiments, the first network energy-saving cell and the anchor cell 102 are neighbors. For example, the first network energy-saving cell and the anchor cell 102 have overlapping coverage or adjacent coverage, that is, the first network energy-saving cell and the anchor cell 102 are neighbors.

[0332] In some embodiments, the second cause value may be an RRC connection restoration cause value selected from at least one existing RRC connection restoration cause value by a higher layer or an AS layer of the terminal 101. Exemplarily, the terminal 101 selects an RRC connection restoration cause value from at least one existing RRC connection restoration cause value according to the higher layer or the access layer AS layer of the terminal 101 and determines it as the second cause value.

[0333] Exemplarily, the purpose of terminal 101 restoring the RRC connection suspended in anchor cell 102 is to allow anchor cell 102 to redirect terminal 101 to the first network energy-saving cell. The recovery cause value of the RRC connection recovery request message sent by terminal 101 on anchor cell 102 is set to the existing cause value (i.e., the above-mentioned second cause value). Terminal 101 selects one from the existing cause values ​​according to implementation. Exemplarily, it can be a high-level implementation of terminal 101 or an AS layer implementation of terminal 101.

[0334] In some embodiments, the at least one existing RRC connection restoration cause value includes at least one of the following: emergency; highPriorityAccess; mt-Access; mo-Signalling; mo-Data; or delayTolerantAccess. Exemplarily, the restoration cause of the RRC connection restoration request message sent by terminal 101 on anchor cell 102 is set to any one of the following cause values: emergency, highPriorityAccess, mt-Access, mo-Signalling, or mo-DatadelayTolerantAccess.

[0335] In step S2402 , after restoring the RRC connection on the anchor cell 102 , the terminal 101 sends a redirection request message.

[0336] In some embodiments, after the terminal 101 resumes the RRC connection on the anchor cell 102 (i.e., the terminal 101 resumes the RRC connection suspended on the anchor cell 102), the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, the anchor cell 102 receives the redirection request message sent by the terminal 101 after the RRC connection is resumed on the anchor cell 102.

[0337] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0338] In some embodiments, after the terminal 101 restores the RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102 via RRC signaling. Exemplarily, the RRC signaling may be named nes-RedirectRequest. Exemplarily, the RRC signaling may also have other naming forms, which are not specifically limited in this disclosure.

[0339] Step S2403 : The anchor cell 102 determines, based on the redirection request message, that the terminal 101 needs to be redirected to the first network energy-saving cell.

[0340] Exemplarily, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell. After receiving the redirection request message, the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell.

[0341] Step S2404: The anchor cell 102 sends indication information.

[0342] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the anchor cell 102 sends the indication information to the terminal 101. Exemplarily, after the terminal 101 restores the RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0343] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0344] In some embodiments, the above-mentioned indication information may be sent by the anchor cell 102 to the terminal 101 through an RRC connection release message. Exemplarily, the anchor cell 102 sends the RRC connection release message to the terminal 101. For example, the terminal 101 may receive the RRC connection release message sent by the anchor cell 102. The RRC connection release message is used to instruct the terminal 101 to release the RRC connection. The RRC connection release message may include redirection indication information, and the redirection indication information includes the above-mentioned indication information.

[0345] Exemplarily, the redirection indication information may be redirectedCarrierInfo (redirection frequency information). Alternatively, exemplary, the redirection indication information may be CarrierInfoNR, which is not specifically limited in this disclosure. Exemplarily, the redirection indication information may be carried by an RRC connection release message.

[0346] In some embodiments, the indication information includes at least one of the following: information indicating the identifier of the redirecting cell; information indicating the frequency of the redirecting cell; and information indicating whether the redirecting cell is a network energy-saving cell. Exemplarily, the indication information may include information indicating the identifier of the redirecting cell. Alternatively, the indication information may include information indicating the frequency of the redirecting cell. Alternatively, the indication information may include information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell and information indicating the frequency of the redirecting cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell and information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the frequency of the redirecting cell and information indicating whether the redirecting cell is a network energy-saving cell. Alternatively, the indication information may include information indicating the identifier of the redirecting cell, information indicating the frequency of the redirecting cell, and information indicating whether the redirecting cell is a network energy-saving cell.

[0347] Exemplarily, the above-mentioned cell identifier may be identification information of the cell, for example, the identification information of the cell may be at least one of the following: PCI, cell identity, RNAC, TAC, etc.

[0348] Exemplarily, the above-mentioned frequency may be the frequency information of the cell. For example, the above-mentioned frequency may be at least one of the following: a frequency layer, a frequency of SSB, a frequency of UL WUS (uplink wake-up signal), etc.

[0349] Exemplarily, whether the redirected cell is a network energy-saving cell (SSB / SIB1-less cell, also called NEScell) can be indicated by a bit, the data type of which is a BOOLEAN type. Exemplarily, if the value of the bit is "true", it indicates that the redirected cell is a network energy-saving cell; otherwise, it indicates that the redirected cell is not a network energy-saving cell. For example, if the value of the bit is "false", it indicates that the redirected cell is not a network energy-saving cell.

[0350] Step S2405 : The anchor cell 102 sends SIB information.

[0351] In some embodiments, the anchor cell 102 sends SIB information to the terminal, wherein the SIB information includes configuration information of one or more network energy-saving cells, and the anchor cell associated with the one or more network energy-saving cells is the anchor cell 102; the SIB information is used by the terminal 101 to obtain the configuration information of the first network energy-saving cell in combination with the indication information, and the configuration information of the first network energy-saving cell is used by the terminal 101 to initiate a random access process on the first network energy-saving cell.

[0352] The optional implementation of step S2405 can refer to the optional implementation of step S2106 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0353] Step S2406: Terminal 101 obtains configuration information of the first network energy-saving cell.

[0354] The optional implementation of step S2406 can refer to the optional implementation of step S2107 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0355] Step S2407: The terminal 101 initiates a random access process in the first network energy-saving cell according to the configuration information of the first network energy-saving cell.

[0356] The optional implementation of step S2407 can refer to the optional implementation of step S2108 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0357] The method according to the embodiments of the present disclosure may include at least one of steps S2401 to S2407. For example, steps S2402, S2406, and S2407 may be implemented as independent embodiments, steps S2401, S2402, S2406, and S2407 may be implemented as independent embodiments, and steps S2403, S2404, and S2405 may be implemented as independent embodiments, but are not limited thereto.

[0358] In some embodiments, step S2401, step S2403, step S2404, and step S2405 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0359] In some embodiments, step S2403, step S2404, and step S2405 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0360] In some embodiments, step S2401, step S2402, step S2406, and step S2407 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0361] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2D .

[0362] Figure 3A is an interactive diagram of an initial access method according to an embodiment of the present disclosure. As shown in Figure 3A, the initial access method according to the embodiment of the present disclosure can be applied to terminal 101, and the method includes but is not limited to the following steps.

[0363] Step S3101: Send an RRC connection establishment request message to the anchor cell 102.

[0364] In some embodiments, the RRC connection establishment request message may be sent by the terminal 101 to the anchor cell 102. Optionally, the terminal 101 sends the RRC connection establishment request message to the anchor cell 102. Exemplarily, the anchor cell 102 receives the RRC connection establishment request message, for example, the anchor cell 102 receives the RRC connection establishment request message sent by the terminal 101.

[0365] In some embodiments, the above-mentioned RRC connection establishment request message is used to request to establish an RRC connection with the anchor cell 102, wherein the above-mentioned RRC connection establishment request message may include a first cause value, and the above-mentioned first cause value indicates that the reason why the terminal 101 establishes the RRC connection is that it needs to be redirected to the first network energy-saving cell.

[0366] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0367] In some embodiments, the first network energy-saving cell and the anchor cell 102 have a neighboring cell relationship.

[0368] In some embodiments, the above-mentioned first cause value also indicates that the anchor cell 102 establishes SRB1 (signaling radio bearer of type 1) and / or performs an initial security activation process for the terminal 101, and / or does not establish SRB2 (signaling radio bearer of type 2) and / or DRB (data radio bearer) for the terminal 101.

[0369] The optional implementation of step S3101 can refer to the optional implementation of step S2101 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0370] Step S3102: After establishing the RRC connection on the anchor cell 102, a redirection request message is sent.

[0371] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0372] The optional implementation of step S3102 can refer to the optional implementation of step S2102 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0373] Step S3103, receiving instruction information.

[0374] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the terminal 101 receives the indication information sent by the anchor cell 102. Optionally, the anchor cell 102 sends the indication information to the terminal 101. Exemplarily, after the terminal 101 establishes an RRC connection on the anchor cell 102, it sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the first cause value of the RRC connection establishment request message and / or the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0375] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0376] In some embodiments, the above-mentioned indication information includes at least one of the following: information indicating the identity of the redirected cell; information indicating the frequency of the redirected cell; and information indicating whether the redirected cell is a network energy-saving cell.

[0377] The optional implementation of step S3103 can refer to the optional implementation of step S2104 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0378] Step S3104, receiving SIB information.

[0379] In some embodiments, the above-mentioned SIB information may be sent by the anchor cell 102. In some embodiments, the anchor cell 102 sends the SIB information to the terminal 101, wherein the SIB information may include configuration information of one or more network energy-saving cells, and the anchor cell associated with the one or more network energy-saving cells is the anchor cell 102; the SIB information is used by the terminal 101 to obtain the configuration information of the first network energy-saving cell in combination with the above-mentioned indication information, and the configuration information of the first network energy-saving cell is used by the terminal 101 to initiate a random access process on the first network energy-saving cell.

[0380] The optional implementation of step S3104 can refer to the optional implementation of step S2106 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0381] Step S3105: Acquire configuration information of the first network energy-saving cell.

[0382] In some embodiments, the terminal 101 obtains the configuration information of the first network energy-saving cell, including at least one of the following: obtaining the system information block SIB information of the anchor cell, the SIB information including the configuration information of one or more network energy-saving cells, and obtaining the configuration information of the first network energy-saving cell in the SIB information according to the indication information and the SIB information, for example, the configuration information of the network energy-saving cell that matches the indication information (PCI) can be selected from the SIB information according to the indication information; obtaining the SIB information of the anchor cell, and obtaining the configuration information of the first network energy-saving cell according to the SIB information of the anchor cell; obtaining the configuration information of the first network energy-saving cell according to the indication information; obtaining the configuration of the first network energy-saving cell according to the indication information and / or the system information block SIB information of the anchor cell.

[0383] In some embodiments, terminal 101 determines, based on the above-mentioned indication information, that the cell to which terminal 101 needs to be redirected is a network energy-saving cell. Terminal 101 obtains, based on the above-mentioned indication information, the cell identifier and / or frequency to which terminal 101 needs to be redirected. Terminal 101 determines, from the configuration information of one or more network energy-saving cells in the SIB information of anchor cell 102, the configuration information of the network energy-saving cell associated with the cell identifier and / or frequency to which terminal 101 needs to be redirected as the configuration information of the first network energy-saving cell.

[0384] In some embodiments, the configuration information of the first network energy-saving cell includes at least one of the following: an identifier and / or frequency of the first network energy-saving cell; RACH-related configuration information of the first network energy-saving cell; and information in SRB1 of the first network energy-saving cell.

[0385] The optional implementation of step S3105 can refer to the optional implementation of step S2107 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0386] Step S3106: Initiate a random access process on the first network energy-saving cell according to the configuration information of the first network energy-saving cell.

[0387] The optional implementation of step S3106 can refer to the optional implementation of step S2108 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0388] The method involved in the embodiment of the present disclosure may include at least one of steps S3101 to S3106. For example, step S3103, step S3105, and step S3106 may be implemented as independent embodiments, and step S3101, step S3103, step S3105, and step S3106 may be implemented as independent embodiments, but are not limited thereto.

[0389] In some embodiments, step S3102 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0390] In some embodiments, step S3101, step S3102, step S3104, and step S3106 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0391] In some embodiments, step S3102 and step S3104 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0392] FIG3B is an interactive diagram of an initial access method according to an embodiment of the present disclosure. As shown in FIG3B , the initial access method according to an embodiment of the present disclosure can be applied to terminal 101, and the method includes but is not limited to the following steps.

[0393] Step S3201: Send an RRC connection establishment request message to the anchor cell 102.

[0394] In some embodiments, the RRC connection establishment request message may be sent by the terminal 101 to the anchor cell 102. Optionally, the terminal 101 sends the RRC connection establishment request message to the anchor cell 102. Exemplarily, the anchor cell 102 receives the RRC connection establishment request message, for example, the anchor cell 102 receives the RRC connection establishment request message sent by the terminal 101.

[0395] In some embodiments, the RRC connection establishment request message is used to request to establish an RRC connection with the anchor cell 102, wherein the RRC connection establishment request message includes a second cause value.

[0396] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0397] In some embodiments, the first network energy-saving cell and the anchor cell 102 have a neighboring cell relationship.

[0398] In some embodiments, the second cause value may be an RRC connection establishment cause value selected from at least one existing RRC connection establishment cause value by a higher layer or an AS layer of the terminal 101. Exemplarily, the terminal 101 selects an RRC connection establishment cause value from at least one existing RRC connection establishment cause value according to the higher layer or the access layer AS layer of the terminal 101 and determines it as the second cause value.

[0399] In some embodiments, the at least one existing RRC connection establishment cause value includes at least one of the following: emergency call; high priority access highPriityAccess; called access mt-Access; calling signaling mo-Signalling; calling data mo-Data; delay tolerant access delayTolerantAccess.

[0400] The optional implementation of step S3201 can refer to the optional implementation of step S2201 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0401] Step S3202: After establishing the RRC connection on the anchor cell 102, a redirection request message is sent.

[0402] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0403] The optional implementation of step S3202 can refer to the optional implementation of step S2202 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0404] Step S3203, receiving instruction information.

[0405] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the anchor cell 102 sends the indication information to the terminal 101. Exemplarily, after the terminal 101 establishes an RRC connection on the anchor cell 102, it sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0406] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0407] In some embodiments, the above indication information may be sent by the anchor cell 102 to the terminal 101 through an RRC connection release message.

[0408] In some embodiments, the above-mentioned indication information includes at least one of the following: information indicating the identity of the redirected cell; information indicating the frequency of the redirected cell; and information indicating whether the redirected cell is a network energy-saving cell.

[0409] The optional implementation of step S3203 can refer to the optional implementation of step S2204 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0410] Step S3204, receiving SIB information.

[0411] In some embodiments, the SIB information may be sent by the anchor cell 102. Optionally, the anchor cell 102 sends the SIB information to the terminal, for example, the terminal 101 receives the SIB information sent by the anchor cell 102. The SIB information includes configuration information of one or more network energy-saving cells, where the anchor cell associated with the one or more network energy-saving cells is the anchor cell 102; the SIB information is used by the terminal 101 to obtain the configuration information of the first network energy-saving cell in combination with the indication information, and the configuration information of the first network energy-saving cell is used by the terminal 101 to initiate a random access procedure on the first network energy-saving cell.

[0412] The optional implementation of step S3204 can refer to the optional implementation of step S2107 in Figure 2A, step S2205 in Figure 2B, and other related parts in the embodiments involved in Figures 2A and 2B, which will not be repeated here.

[0413] Step S3205: Acquire configuration information of the first network energy-saving cell.

[0414] The optional implementation of step S3205 can refer to the optional implementation of step S2107 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0415] Step S3206: Initiate a random access process on the first network energy-saving cell according to the configuration information of the first network energy-saving cell.

[0416] The optional implementation of step S3206 can refer to the optional implementation of step S2108 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0417] The method according to the embodiments of the present disclosure may include at least one of steps S3201 to S3206. For example, steps S3202, S3205, and S3206 may be implemented as independent embodiments, steps S3201, S3202, S3205, and S3206 may be implemented as independent embodiments, and steps S3201, S3202, S3203, S3204, S3205, and S3206 may be implemented as independent embodiments, but are not limited thereto.

[0418] In some embodiments, step S3201, step S3203, and step S3204 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0419] In some embodiments, step S3202, step S3203, and step S3204 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0420] Figure 3C is an interactive diagram of an initial access method according to an embodiment of the present disclosure. As shown in Figure 3C, the initial access method according to an embodiment of the present disclosure can be applied to terminal 101, and the method includes but is not limited to the following steps.

[0421] Step S3301: Send an RRC connection recovery request message to the anchor cell 102.

[0422] In some embodiments, the RRC connection restoration request message may be sent by the terminal 101 to the anchor cell 102. Optionally, the terminal 101 sends the RRC connection restoration request message to the anchor cell 102. Exemplarily, the anchor cell 102 receives the RRC connection restoration request message, for example, the anchor cell 102 receives the RRC connection restoration request message sent by the terminal 101.

[0423] In some embodiments, the above-mentioned RRC connection recovery request message is used to request the recovery of the RRC connection suspended in the anchor cell 102, wherein the above-mentioned RRC connection recovery request message may include a first cause value, and the above-mentioned first cause value indicates that the reason why the terminal 101 recovers the RRC connection suspended in the anchor cell 102 is that it needs to be redirected to the first network energy-saving cell.

[0424] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0425] In some embodiments, the first network energy-saving cell and the anchor cell 102 have a neighboring cell relationship.

[0426] In some embodiments, the first cause value further instructs the anchor cell 102 to establish SRB1 and / or perform an initial security activation process for the terminal 101 , and / or not to establish SRB2 and / or DRB for the terminal 101 .

[0427] The optional implementation of step S3301 can refer to the optional implementation of step S2301 in Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0428] Step S3302: After the RRC connection is restored on the anchor cell 102, a redirection request message is sent.

[0429] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0430] The optional implementation of step S3302 can refer to the optional implementation of step S2302 in Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0431] Step S3303, receiving instruction information.

[0432] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the anchor cell 102 sends the indication information to the terminal 101. Exemplarily, after restoring the RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the first cause value of the RRC connection restoration request message and / or the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0433] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0434] In some embodiments, the above-mentioned indication information includes at least one of the following: information indicating the identity of the redirected cell; information indicating the frequency of the redirected cell; and information indicating whether the redirected cell is a network energy-saving cell.

[0435] The optional implementation of step S3303 can refer to the optional implementation of step S2304 in Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0436] Step S3304, receiving SIB information.

[0437] In some embodiments, the SIB information may be sent by the anchor cell 102. Optionally, the anchor cell 102 sends the SIB information to the terminal, for example, the terminal 101 receives the SIB information sent by the anchor cell 102. The SIB information includes configuration information of one or more network energy-saving cells, where the anchor cell associated with the one or more network energy-saving cells is the anchor cell 102; the SIB information is used by the terminal 101 to obtain the configuration information of the first network energy-saving cell in combination with the indication information, and the configuration information of the first network energy-saving cell is used by the terminal 101 to initiate a random access procedure on the first network energy-saving cell.

[0438] The optional implementation of step S3304 can refer to the optional implementation of step S2106 in Figure 2A, step S2306 in Figure 2C, and other related parts in the embodiments involved in Figures 2A and 2C, which will not be repeated here.

[0439] Step S3305: Acquire configuration information of the first network energy-saving cell.

[0440] The optional implementation of step S3305 can refer to the optional implementation of step S2107 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0441] Step S3306: The terminal 101 initiates a random access process on the first network energy-saving cell according to the configuration information of the first network energy-saving cell.

[0442] The optional implementation of step S3306 can refer to the optional implementation of step S2108 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0443] The method involved in the embodiments of the present disclosure may include at least one of steps S3301 to S3306. For example, step S3305 and step S3306 can be implemented as independent embodiments, step S3303, step S3305, and step S3306 can be implemented as independent embodiments, step S3303, step S3304, step S3305, and step S3306 can be implemented as independent embodiments, and step S3301, step S3303, step S3304, step S3305, and step S3306 can be implemented as independent embodiments, but the present invention is not limited thereto.

[0444] In some embodiments, step S3302 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0445] In some embodiments, step S3301, step S3302, step S3303, and step S3304 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0446] In some embodiments, step S3301, step S3302, and step S3304 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0447] In some embodiments, step S3301 and step S3302 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0448] FIG3D is an interactive diagram of an initial access method according to an embodiment of the present disclosure. As shown in FIG3D , the initial access method according to an embodiment of the present disclosure can be applied to terminal 101, and the method includes but is not limited to the following steps.

[0449] Step S3401: Send an RRC connection recovery request message to the anchor cell 102.

[0450] In some embodiments, the RRC connection restoration request message may be sent by the terminal 101 to the anchor cell 102. Optionally, the terminal 101 sends the RRC connection restoration request message to the anchor cell 102. Exemplarily, the anchor cell 102 receives the RRC connection restoration request message, for example, the anchor cell 102 receives the RRC connection restoration request message sent by the terminal 101.

[0451] In some embodiments, the RRC connection restoration request message is used to request restoration of the RRC connection suspended in the anchor cell 102 , wherein the RRC connection restoration request message includes a second cause value.

[0452] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0453] In some embodiments, the first network energy-saving cell and the anchor cell 102 have a neighboring cell relationship.

[0454] In some embodiments, the second cause value may be an RRC connection restoration cause value selected from at least one existing RRC connection restoration cause value by a higher layer or an AS layer of the terminal 101. Exemplarily, the terminal 101 selects an RRC connection restoration cause value from at least one existing RRC connection restoration cause value according to the higher layer or the access layer AS layer of the terminal 101 and determines it as the second cause value.

[0455] In some embodiments, the at least one existing RRC connection resumption cause value includes at least one of the following: emergency; highPriorityAccess; mt-Access; mo-Signalling; mo-Data; delayTolerantAccess.

[0456] The optional implementation of step S3401 can refer to the optional implementation of step S2401 in Figure 2D and other related parts in the embodiment involved in Figure 2D, which will not be repeated here.

[0457] Step S3402: After the RRC connection is restored on the anchor cell 102, a redirection request message is sent.

[0458] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0459] The optional implementation of step S3402 can refer to the optional implementation of step S2402 in Figure 2D and other related parts of the embodiment involved in Figure 2D, which will not be repeated here.

[0460] Step S3403, receiving instruction information.

[0461] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the anchor cell 102 sends the indication information to the terminal 101, for example, the terminal 101 receives the indication information sent by the anchor cell 102. Exemplarily, after restoring the RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0462] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0463] In some embodiments, the above indication information may be sent by the anchor cell 102 to the terminal 101 through an RRC connection release message.

[0464] In some embodiments, the above-mentioned indication information includes at least one of the following: information indicating the identity of the redirected cell; information indicating the frequency of the redirected cell; and information indicating whether the redirected cell is a network energy-saving cell.

[0465] The optional implementation of step S3403 can refer to the optional implementation of step S2404 in Figure 2D and other related parts in the embodiment involved in Figure 2D, which will not be repeated here.

[0466] Step S3404, receiving SIB information.

[0467] In some embodiments, the SIB information may be sent by the anchor cell 102. Exemplarily, the terminal 101 receives the SIB information sent by the anchor cell 102. The SIB information includes configuration information of one or more network energy-saving cells, where the anchor cell associated with the one or more network energy-saving cells is the anchor cell 102. The SIB information is used by the terminal 101 to obtain configuration information of the first network energy-saving cell in combination with the indication information. The configuration information of the first network energy-saving cell is used by the terminal 101 to initiate a random access procedure on the first network energy-saving cell.

[0468] The optional implementation of step S3404 can refer to the optional implementation of step S2106 in Figure 2A, step S2405 in Figure 2D, and other related parts in the embodiments involved in Figures 2A and 2D, which will not be repeated here.

[0469] Step S3405: ​​Acquire configuration information of the first network energy-saving cell.

[0470] The optional implementation of step S3405 can refer to the optional implementation of step S2107 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0471] Step S3406: Initiate a random access process on the first network energy-saving cell according to the configuration information of the first network energy-saving cell.

[0472] The optional implementation of step S3406 can refer to the optional implementation of step S2108 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0473] The method according to the embodiments of the present disclosure may include at least one of steps S3401 to S3406. For example, steps S3402, S3405, and S3406 may be implemented as independent embodiments, steps S3401, S3402, S3405, and S3406 may be implemented as independent embodiments, and steps S3401, S3402, S3403, S3404, S3405, and S3406 may be implemented as independent embodiments, but are not limited thereto.

[0474] In some embodiments, step S3401, step S3403, and step S3404 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0475] In some embodiments, step S3403 and step S3404 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0476] Figure 3E is an interactive diagram of an initial access method according to an embodiment of the present disclosure. As shown in Figure 3E, the initial access method according to an embodiment of the present disclosure can be applied to terminal 101, and the method includes but is not limited to the following steps.

[0477] Step S3501: establishing and / or restoring a radio resource control RRC connection on the anchor cell 102 so that the anchor cell 102 redirects the terminal 101 to the first network energy-saving cell.

[0478] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0479] In some embodiments, terminal 101 sends an RRC connection establishment request message to anchor cell 102; wherein the RRC connection establishment request message is used to request establishment of an RRC connection with anchor cell 102, and the RRC connection establishment request message includes a first cause value, which indicates that the reason for terminal 101 to establish the RRC connection is the need to redirect to the first network energy-saving cell. Optional implementations thereof can be found in the optional implementations of step S2101 in FIG. 2A and other related portions of the embodiment involved in FIG. 2A , and are not further described here.

[0480] In one possible implementation, the first cause value further instructs the anchor cell 102 to establish a signaling radio bearer SRB1 of type 1 and / or perform an initial security activation process for the terminal 101, and / or not to establish a signaling radio bearer SRB2 of type 2 and / or a data radio bearer DRB for the terminal 101. For optional implementations thereof, reference may be made to the optional implementation of step S2101 in FIG. 2A and other related parts of the embodiment involved in FIG. 2A , which will not be described in detail herein.

[0481] In one possible implementation, after establishing an RRC connection on anchor cell 102, terminal 101 sends a redirection request message to anchor cell 102. The redirection request message is used to request anchor cell 102 to redirect terminal 101 to the first network energy-saving cell. For optional implementations, see the optional implementation of step S2102 in FIG. 2A and other related portions of the embodiment involved in FIG. 2A , which will not be described in detail here.

[0482] In some embodiments, the terminal 101 sends an RRC connection recovery request message to the anchor cell 102; wherein the RRC connection recovery request message is used to request the recovery of the RRC connection suspended in the anchor cell 102, and the RRC connection recovery request message includes a first cause value, and the first cause value indicates that the reason why the terminal 101 recovers the RRC connection suspended in the anchor cell 102 is that it needs to be redirected to the first network energy-saving cell. Optionally, the first cause value also instructs the anchor cell 102 to establish a signaling radio bearer SRB1 of type 1 for the terminal 101 and / or perform an initial security activation process, and / or not to establish a signaling radio bearer SRB2 of type 2 and / or a data radio bearer DRB for the terminal 101. Its optional implementation method can refer to the optional implementation method of step S2301 of Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0483] In one possible implementation, after establishing and / or restoring an RRC connection on anchor cell 102, terminal 101 sends a redirection request message to anchor cell 102. The redirection request message is used to request anchor cell 102 to redirect terminal 101 to the first network energy-saving cell. For optional implementations, see the optional implementation of step S2302 in FIG. 2C and other related portions of the embodiment involved in FIG. 2C , which will not be described in detail here.

[0484] In some embodiments, terminal 101 sends an RRC connection establishment request message to anchor cell 102; wherein the RRC connection establishment request message is used to request establishment of an RRC connection with anchor cell 102, and the RRC connection establishment request message includes a second cause value; after establishing the RRC connection on anchor cell 102, terminal 101 sends a redirection request message to anchor cell 102; wherein the redirection request message is used to request anchor cell 102 to redirect terminal 101 to the first network energy-saving cell. Optional implementations thereof can be found in step S2201 and the optional implementations of step S2202 of FIG. 2B , as well as other related portions of the embodiment involved in FIG. 2B , which will not be described in detail here.

[0485] In one possible implementation, terminal 101 selects an RRC connection establishment cause value from at least one existing RRC connection establishment cause value as the second cause value based on a higher layer or access layer (AS) implementation of terminal 101. Exemplarily, the at least one existing RRC connection establishment cause value includes at least one of the following: emergency; high-priority access; mt-Access; mo-Signalling; mo-Data; and delay-tolerant access.

[0486] In some embodiments, terminal 101 sends an RRC connection restoration request message to anchor cell 102; wherein the RRC connection restoration request message is used to request restoration of the RRC connection suspended on anchor cell 102, and the RRC connection restoration request message includes a second cause value; after restoring the RRC connection suspended on anchor cell 102, terminal 101 sends a redirection request message to anchor cell 102; wherein the redirection request message is used to request anchor cell 102 to redirect terminal 101 to the first network energy-saving cell. Optional implementations thereof can be found in step S2401 and the optional implementation of step S2402 in FIG. 2D , as well as other related portions of the embodiment involved in FIG. 2D , which will not be described in detail here.

[0487] In one possible implementation, based on a higher layer or access layer (AS) implementation of terminal 101, an RRC connection restoration cause value is selected from at least one existing RRC connection restoration cause value and determined as the second cause value. Exemplarily, the at least one existing RRC connection restoration cause value includes at least one of the following: emergency; highPriorityAccess; mt-Access; mo-Signalling; mo-Data; and delay-tolerant Access.

[0488] Step S3502 : receiving indication information sent by the anchor cell 102 .

[0489] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0490] In some embodiments, the terminal 101 receives an RRC connection release message sent by the anchor cell 102. The RRC connection release message is used to instruct the terminal 101 to release the RRC connection. The RRC connection release message includes redirection indication information. The redirection indication information includes the above indication information.

[0491] In some embodiments, the indication information includes at least one of the following: information indicating an identifier of the redirected cell; information indicating a frequency of the redirected cell; and information indicating whether the redirected cell is a network energy-saving cell.

[0492] The optional implementation of step S3502 can refer to the optional implementation of step S2104 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0493] In step S3503, a random access process is initiated on the first network energy-saving cell.

[0494] In some embodiments, configuration information of a first network energy-saving cell is obtained; and a random access process is initiated on the first network energy-saving cell according to the configuration information of the first network energy-saving cell.

[0495] In some embodiments, the terminal 101 obtains the configuration information of the first network energy-saving cell, including at least one of the following: obtaining the system information block SIB information of the anchor cell, the SIB information including the configuration information of one or more network energy-saving cells, and obtaining the configuration information of the first network energy-saving cell in the SIB information according to the indication information and the SIB information; obtaining the SIB information of the anchor cell, and obtaining the configuration information of the first network energy-saving cell according to the SIB information of the anchor cell; obtaining the configuration information of the first network energy-saving cell according to the indication information; obtaining the configuration of the first network energy-saving cell according to the indication information and / or the system information block SIB information of the anchor cell.

[0496] In one implementation, system information block (SIB) information of the anchor cell 102 is obtained, where the SIB information includes configuration information of one or more network energy-saving cells; and configuration information of the first network energy-saving cell is obtained according to the indication information and / or the SIB information.

[0497] In one possible implementation, an optional implementation for obtaining the configuration information of the first network energy-saving cell based on the indication information and / or SIB information includes at least one of the following: determining, based on the indication information, that the redirected cell is a network energy-saving cell; obtaining, based on the indication information, an identifier and / or frequency of the redirected cell; and determining, from the configuration information of one or more network energy-saving cells in the SIB information, the configuration information of the network energy-saving cell associated with the identifier and / or frequency as the configuration information of the first network energy-saving cell. For optional implementations, see step S2107 and step S2108 of FIG. 2A , as well as other related portions of the embodiment involved in FIG. These optional implementations are not further described here.

[0498] In some embodiments, the configuration information of the first network energy-saving cell includes at least one of the following: the identifier and / or frequency of the first network energy-saving cell; the random access channel RACH related configuration information of the first network energy-saving cell; and the information in the SRB1 of the first network energy-saving cell.

[0499] In some embodiments, the first network energy-saving cell and the anchor cell 102 have a neighboring cell relationship.

[0500] FIG4A is a flow chart illustrating an initial access method according to an embodiment of the present disclosure. As shown in FIG4A , the embodiment of the present disclosure relates to an initial access method, which may be performed by the anchor cell 102 and may include but is not limited to the following steps.

[0501] Step S4101: Receive an RRC connection establishment request message.

[0502] In some embodiments, the RRC connection establishment request message is sent by the terminal 101 to the anchor cell 102. For example, the terminal 102 sends the RRC connection establishment request message, for example, the terminal 102 sends the RRC connection establishment request message to the anchor cell. The anchor cell 102 receives the RRC connection establishment request message sent by the terminal 101.

[0503] In some embodiments, the RRC connection establishment request message is used to request to establish an RRC connection with the anchor cell 102 .

[0504] In some embodiments, the RRC connection establishment request message includes a first cause value, which indicates that the reason why the terminal 101 establishes the RRC connection is that it needs to be redirected to the first network energy-saving cell.

[0505] In some embodiments, the first cause value further indicates that the anchor cell 102 establishes a type 1 signaling radio bearer SRB1 for the terminal 101 and / or performs an initial security activation process, and / or does not establish a type 2 signaling radio bearer SRB2 and / or a data radio bearer DRB for the terminal 101.

[0506] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0507] The optional implementation of step S4101 can refer to the optional implementation of step S2101 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0508] Step S4102 : receiving a redirection request message sent by the terminal 101 after establishing an RRC connection on the anchor cell 102 .

[0509] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0510] The optional implementation of step S4102 can refer to the optional implementation of step S2102 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0511] Step S4103: Determine, based on the first cause value, that the terminal 101 needs to be redirected to the first network energy-saving cell.

[0512] In some embodiments, the first cause value is included in the RRC connection establishment request message, which is sent by the terminal 101 to the anchor cell 102. The first cause value indicates that the reason for the terminal 101 to establish the RRC connection is that it needs to be redirected to the first network energy-saving cell.

[0513] The optional implementation of step S4103 can refer to the optional implementation of step S2103 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0514] Step S4104: establish a signaling radio bearer SRB1 of type 1 for the terminal 101 and / or perform an initial security activation process, and / or do not establish a signaling radio bearer SRB2 of type 2 and / or a data radio bearer DRB for the terminal 101.

[0515] The optional implementation of step S4104 can refer to the optional implementation of step S2105 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0516] Step S4105, sending instruction information.

[0517] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the anchor cell 102 sends the indication information to the terminal 101. Exemplarily, after establishing an RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the first cause value of the RRC connection establishment request message and / or the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0518] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0519] In some embodiments, the above-mentioned indication information may be sent by the anchor cell 102 to the terminal 101 through an RRC connection release (RRCConnectionRelease) message. Exemplarily, the anchor cell 102 sends the RRC connection release message to the terminal 101. For example, the terminal 101 may receive the RRC connection release message sent by the anchor cell 102. The RRC connection release message is used to instruct the terminal 101 to release the RRC connection. The RRC connection release message may include redirection indication information, and the redirection indication information includes the above-mentioned indication information.

[0520] In some embodiments, the indication information includes at least one of the following: information indicating an identifier of the redirected cell; information indicating a frequency of the redirected cell; and information indicating whether the redirected cell is a network energy-saving cell.

[0521] The optional implementation of step S4105 can refer to the optional implementation of step S2104 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0522] Step S4106, sending SIB information.

[0523] In some embodiments, anchor cell 102 sends SIB information to terminal 101, where the SIB information includes configuration information of one or more network energy-saving cells, the anchor cell associated with one or more network energy-saving cells being anchor cell 102. The SIB information is used by terminal 101, in conjunction with the indication information, to obtain configuration information of a first network energy-saving cell. The configuration information of the first network energy-saving cell is used by terminal 101 to initiate a random access procedure on the first network energy-saving cell. Terminal 101 obtains the configuration information of the first network energy-saving cell based on the indication information and / or the SIB information of anchor cell 102, and initiates a random access procedure on the first network energy-saving cell based on the configuration information of the first network energy-saving cell. Optional implementations of this method can be found in step S2107 and step S2108 of FIG. 2A , as well as other related portions of the embodiment involved in FIG. These will not be described in detail here.

[0524] The optional implementation of step S4106 can refer to the optional implementation of step S2106 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0525] The method involved in the embodiments of the present disclosure may include at least one of steps S4101 to S4106. For example, steps S4101, S4103, S4104, and S4105 may be implemented as independent embodiments, and steps S4101, S4103, S4104, S4105, and S4106 may be implemented as independent embodiments, but are not limited thereto.

[0526] In some embodiments, step S4104 and step S4105 may be executed in an interchanged order or simultaneously.

[0527] In some embodiments, step S4102 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0528] In some embodiments, step S4102 and step S4106 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0529] FIG4B is a flow chart of an initial access method according to an embodiment of the present disclosure. As shown in FIG4B , the embodiment of the present disclosure relates to an initial access method, which can be executed by terminal 101 and may include but is not limited to the following steps.

[0530] Step S4201: Receive an RRC connection establishment request message.

[0531] In some embodiments, the RRC connection establishment request message is sent by the terminal 101 to the anchor cell 102. For example, the terminal 102 sends the RRC connection establishment request message, for example, the terminal 102 sends the RRC connection establishment request message to the anchor cell. The anchor cell 102 receives the RRC connection establishment request message sent by the terminal 101.

[0532] In some embodiments, the RRC connection establishment request message is used to request to establish an RRC connection with the anchor cell 102, wherein the RRC connection establishment request message includes a second cause value.

[0533] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0534] In some embodiments, the first network energy-saving cell and the anchor cell 102 have a neighboring cell relationship.

[0535] In some embodiments, the second cause value may be an RRC connection establishment cause value selected from at least one existing RRC connection establishment cause value by a higher layer or an AS layer of the terminal 101. Exemplarily, the terminal 101 selects an RRC connection establishment cause value from at least one existing RRC connection establishment cause value according to the higher layer or the access layer AS layer of the terminal 101 and determines it as the second cause value.

[0536] In some embodiments, the at least one existing RRC connection establishment cause value includes at least one of the following: emergency call; high priority access highPriityAccess; called access mt-Access; calling signaling mo-Signalling; calling data mo-Data; delay tolerant access delayTolerantAccess.

[0537] The optional implementation of step S4201 can refer to the optional implementation of step S2201 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0538] Step S4202 : receiving a redirection request message sent by the terminal 101 after establishing an RRC connection on the anchor cell 102 .

[0539] In some embodiments, the redirection request message is sent by the terminal 101 after establishing an RRC connection on the anchor cell 102. Exemplarily, after establishing an RRC connection on the anchor cell 102, the terminal 101 sends the redirection request message to the anchor cell 102. Optionally, the anchor cell 102 receives the redirection request message sent by the terminal 101 after establishing the RRC connection on the anchor cell 102.

[0540] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0541] The optional implementation of step S4202 can refer to the optional implementation of step S2202 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0542] Step S4203: Based on the redirection request message, it is determined that the terminal 101 needs to be redirected to the first network energy-saving cell.

[0543] The optional implementation of step S4203 can refer to the optional implementation of step S2203 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0544] Step S4204, sending instruction information.

[0545] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the anchor cell 102 sends the indication information to the terminal 101. Exemplarily, after the terminal 101 establishes an RRC connection on the anchor cell 102, it sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0546] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0547] In some embodiments, the above indication information may be sent by the anchor cell 102 to the terminal 101 through an RRC connection release message.

[0548] The optional implementation of step S4204 can refer to the optional implementation of step S2204 in Figure 2B and other related parts in the embodiment involved in Figure 2B, which will not be repeated here.

[0549] Step S4205, sending SIB information.

[0550] In some embodiments, anchor cell 102 sends SIB information to the terminal, where the SIB information includes configuration information of one or more network energy-saving cells, and the anchor cell associated with these one or more network energy-saving cells is anchor cell 102. This SIB information is used by terminal 101 to obtain configuration information of a first network energy-saving cell in combination with the indication information. The configuration information of the first network energy-saving cell is used by terminal 101 to initiate a random access procedure on the first network energy-saving cell. Terminal 101 obtains the configuration information of the first network energy-saving cell based on the indication information and / or the SIB information of anchor cell 102, and initiates a random access procedure on the first network energy-saving cell based on the configuration information of the first network energy-saving cell. Optional implementations of this method can be found in step S2107 and step S2108 of FIG. 2A , as well as other related portions of the embodiment involved in FIG. These will not be described in detail here.

[0551] The optional implementation of step S4205 can refer to the optional implementation of step S2106 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0552] The method involved in the embodiments of the present disclosure may include at least one of steps S4201 to S4205. For example, steps S4201, S4202, S4203, and S4204 may be implemented as independent embodiments, and steps S4201, S4202, S4203, S4204, and S4205 may be implemented as independent embodiments, but are not limited thereto.

[0553] In some embodiments, step S4205 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0554] FIG4C is a flow chart showing an initial access method according to an embodiment of the present disclosure. As shown in FIG4C , the embodiment of the present disclosure relates to an initial access method, which can be executed by terminal 101 and may include but is not limited to the following steps.

[0555] Step S4301: Receive an RRC connection recovery request message.

[0556] In some embodiments, the RRC connection restoration request message may be sent by the terminal 101 to the anchor cell 102. Optionally, the terminal 101 sends the RRC connection restoration request message to the anchor cell 102. Exemplarily, the anchor cell 102 receives the RRC connection restoration request message, for example, the anchor cell 102 receives the RRC connection restoration request message sent by the terminal 101.

[0557] In some embodiments, the above-mentioned RRC connection recovery request message is used to request the recovery of the RRC connection suspended in the anchor cell 102, wherein the above-mentioned RRC connection recovery request message may include a first cause value, and the above-mentioned first cause value indicates that the reason why the terminal 101 recovers the RRC connection suspended in the anchor cell 102 is that it needs to be redirected to the first network energy-saving cell.

[0558] In some embodiments, the first cause value further instructs the anchor cell 102 to establish SRB1 and / or perform an initial security activation process for the terminal 101 , and / or not to establish SRB2 and / or DRB for the terminal 101 .

[0559] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0560] In some embodiments, the first network energy-saving cell and the anchor cell 102 have a neighboring cell relationship.

[0561] The optional implementation of step S4301 can refer to the optional implementation of step S2301 in Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0562] Step S4302 : receiving a redirection request message sent by the terminal 101 after restoring the RRC connection on the anchor cell 102 .

[0563] In some embodiments, the redirection request message is sent by the terminal 101 to the anchor cell 102 after resuming the RRC connection suspended by the anchor cell 102. Exemplarily, after the terminal 101 resumes the RRC connection on the anchor cell 102 (i.e., the terminal 101 resumes the RRC connection suspended on the anchor cell 102), the redirection request message is sent to the anchor cell 102. Optionally, the anchor cell 102 receives the redirection request message sent by the terminal 101 after resuming the RRC connection on the anchor cell 102.

[0564] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0565] The optional implementation of step S4302 can refer to the optional implementation of step S2302 in Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0566] Step S4303: According to the first cause value, it is determined that the terminal 101 needs to be redirected to the first network energy-saving cell.

[0567] In some embodiments, the first cause value is included in the RRC connection restoration request message, which is sent by terminal 101 to anchor cell 102. The first cause value indicates that the reason for terminal 101 to restore the RRC connection is that it needs to be redirected to the first network energy-saving cell. Upon receiving the RRC connection restoration request message sent by terminal 101, anchor cell 102 may determine, based on the first cause value in the RRC connection restoration request message, that terminal 101 needs to be redirected to the first network energy-saving cell.

[0568] Step S4304, sending instruction information.

[0569] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the anchor cell 102 sends the indication information to the terminal 101. Exemplarily, after restoring the RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the first cause value of the RRC connection restoration request message and / or the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0570] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0571] The optional implementation of step S4304 can refer to the optional implementation of step S2304 in Figure 2C and other related parts in the embodiment involved in Figure 2C, which will not be repeated here.

[0572] Step S4305: establishing SRB1 for terminal 101 and / or performing an initial security activation process, and / or not establishing SRB2 and / or DRB for terminal 101.

[0573] In some embodiments, the first cause value further instructs the anchor cell 102 to establish an SRB1 (signaling radio bearer of type 1) and / or perform an initial security activation process for the terminal 101, and / or not to establish an SRB2 (signaling radio bearer of type 2) and / or a DRB (data radio bearer) for the terminal 101. The first cause value is included in the RRC connection recovery request message. Exemplarily, upon receiving the RRC connection recovery request message, the anchor cell 102 determines that it is necessary to establish an SRB1 and / or perform an initial security activation process for the terminal 101, and / or not to establish an SRB2 and / or a DRB for the terminal 101 based on the first cause value in the RRC connection recovery request message. That is to say, after receiving the RRC connection recovery request message sent by the terminal 101, the anchor cell 102 determines that the recovery cause value is set to the new cause value (that is, the first cause value mentioned above), and the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell. The anchor cell 102 establishes SRB1 and / or security activation for the terminal 101, and does not establish SRB2 and / or DRB for the terminal 101.

[0574] Step S4306, sending SIB information.

[0575] The optional implementation of step S4306 can refer to the optional implementation of step S2106 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0576] The method according to the embodiments of the present disclosure may include at least one of steps S4301 to S4306. For example, steps S4301, S4303, S4304, and S4305 may be implemented as independent embodiments, and steps S4301, S4303, S4304, S4305, and S4306 may be implemented as independent embodiments, but are not limited thereto.

[0577] In some embodiments, step S4304 and step S4305 may be executed in an interchanged order or simultaneously.

[0578] In some embodiments, step S4302 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0579] In some embodiments, step S4302 and step S4306 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0580] FIG4D is a flow chart of an initial access method according to an embodiment of the present disclosure. As shown in FIG4D , the embodiment of the present disclosure relates to an initial access method, which can be executed by terminal 101 and may include but is not limited to the following steps.

[0581] Step S4401: Receive an RRC connection recovery request message.

[0582] In some embodiments, the RRC connection restoration request message may be sent by the terminal 101 to the anchor cell 102. Optionally, the terminal 101 sends the RRC connection restoration request message to the anchor cell 102. Exemplarily, the anchor cell 102 receives the RRC connection restoration request message, for example, the anchor cell 102 receives the RRC connection restoration request message sent by the terminal 101.

[0583] In some embodiments, the RRC connection restoration request message is used to request restoration of the RRC connection suspended in the anchor cell 102 , wherein the RRC connection restoration request message includes a second cause value.

[0584] In some embodiments, the first network energy-saving cell may be an SSB / SIB1-less cell (also called an NES cell). The SSB / SIB1-less cell does not send SSB, SIB1, other SIBs, or paging, but the terminal can initiate a RACH process to the SSB / SIB1-less cell. The SSB / SIB1-less cell does not send SSB, and SIB1 can be broadcasted through an associated cell (also called an anchor cell) to configure it.

[0585] In some embodiments, the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0586] In some embodiments, the first network energy-saving cell and the anchor cell 102 are neighbors. For example, the first network energy-saving cell and the anchor cell 102 have overlapping coverage or adjacent coverage, that is, the first network energy-saving cell and the anchor cell 102 are neighbors.

[0587] In some embodiments, the second cause value may be an RRC connection restoration cause value selected from at least one existing RRC connection restoration cause value by a higher layer or an AS layer of the terminal 101. Exemplarily, the terminal 101 selects an RRC connection restoration cause value from at least one existing RRC connection restoration cause value according to the higher layer or the access layer AS layer of the terminal 101 and determines it as the second cause value.

[0588] Exemplarily, the purpose of terminal 101 restoring the RRC connection suspended in anchor cell 102 is to allow anchor cell 102 to redirect terminal 101 to the first network energy-saving cell. The recovery cause value of the RRC connection recovery request message sent by terminal 101 on anchor cell 102 is set to the existing cause value (i.e., the above-mentioned second cause value). Terminal 101 selects one from the existing cause values ​​according to implementation. Exemplarily, it can be a high-level implementation of terminal 101 or an AS layer implementation of terminal 101.

[0589] In some embodiments, the at least one existing RRC connection restoration cause value includes at least one of the following: emergency; highPriorityAccess; mt-Access; mo-Signalling; mo-Data; or delayTolerantAccess. Exemplarily, the restoration cause of the RRC connection restoration request message sent by terminal 101 on anchor cell 102 is set to any one of the following cause values: emergency, highPriorityAccess, mt-Access, mo-Signalling, or mo-DatadelayTolerantAccess.

[0590] Step S4402 : receiving a redirection request message sent by the terminal 101 after restoring the RRC connection on the anchor cell 102 .

[0591] In some embodiments, the redirection request message is sent by the terminal 101 after resuming the RRC connection suspended by the anchor cell 102. Exemplarily, after the terminal 101 resumes the RRC connection on the anchor cell 102 (i.e., the terminal 101 resumes the RRC connection suspended on the anchor cell 102), the terminal 101 sends the redirection request message to the anchor cell 102. Optionally, the anchor cell 102 receives the redirection request message sent by the terminal 101 after resuming the RRC connection on the anchor cell 102.

[0592] In some embodiments, the redirection request message is used to request the anchor cell 102 to redirect the terminal 101 to the first network energy-saving cell.

[0593] In some embodiments, after the terminal 101 restores the RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102 via RRC signaling. Exemplarily, the RRC signaling may be named nes-RedirectRequest. Exemplarily, the RRC signaling may also have other naming forms, which are not specifically limited in this disclosure.

[0594] Step S4403: Based on the redirection request message, it is determined that the terminal 101 needs to be redirected to the first network energy-saving cell.

[0595] The optional implementation of step S4403 can refer to the optional implementation of step S2403 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0596] Step S4404, sending instruction information.

[0597] In some embodiments, the above-mentioned indication information is sent by the anchor cell 102 to the terminal 101. In some embodiments, the anchor cell 102 sends the indication information to the terminal 101. Exemplarily, after the terminal 101 restores the RRC connection on the anchor cell 102, the terminal 101 sends a redirection request message to the anchor cell 102. Optionally, after the anchor cell 102 determines that the terminal 101 needs to be redirected to the first network energy-saving cell based on the redirection request message sent by the terminal 101, the anchor cell 102 sends the indication information to the terminal 101.

[0598] In some embodiments, the above-mentioned indication information is used to instruct the terminal 101 to redirect to the first network energy-saving cell.

[0599] The optional implementation of step S4404 can refer to the optional implementation of step S2404 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0600] Step S4405, send SIB information.

[0601] In some embodiments, the anchor cell 102 sends SIB information to the terminal, wherein the SIB information includes configuration information of one or more network energy-saving cells, and the anchor cell associated with the one or more network energy-saving cells is the anchor cell 102; the SIB information is used by the terminal 101 to obtain the configuration information of the first network energy-saving cell in combination with the indication information, and the configuration information of the first network energy-saving cell is used by the terminal 101 to initiate a random access process on the first network energy-saving cell.

[0602] The optional implementation of step S4405 can refer to the optional implementation of step S2106 in Figure 2A and other related parts in the embodiment involved in Figure 2A, which will not be repeated here.

[0603] The method involved in the embodiments of the present disclosure may include at least one of steps S4401 to S4405. For example, steps S4401, S4402, S4403, and S4404 may be implemented as independent embodiments, and steps S4401, S4402, S4403, S4404, and S4405 may be implemented as independent embodiments, but are not limited thereto.

[0604] In some embodiments, step S4405 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0605] FIG4E is an interactive diagram illustrating an initial access method according to an embodiment of the present disclosure. As shown in FIG3E , the initial access method according to an embodiment of the present disclosure may be applied to an anchor cell 102, and the method includes but is not limited to the following steps.

[0606] Step S4501: Receive an RRC connection establishment and / or recovery request message sent by a terminal.

[0607] In some embodiments, an RRC connection establishment request message sent by a terminal is received. In some embodiments, the RRC connection establishment request message is used to request establishment of an RRC connection with an anchor cell. Optional implementations thereof can be found in step S2101 of FIG. 2A , step S2201 of FIG. 2B , and other related portions of the embodiments described in FIG. 2A and FIG. 2B , which are not further described here.

[0608] In some embodiments, an RRC connection restoration request message is received from a terminal. Exemplarily, the RRC connection restoration request message is used to request restoration of an RRC connection suspended in an anchor cell. Optional implementations thereof may be found in step S2301 of FIG. 2C , step S2401 of FIG. 2D , and other related portions of the embodiments described in FIG. 2C and FIG. 2D , and are not further described herein.

[0609] Step S4502: Determine that the terminal needs to be redirected to a first network energy-saving cell; wherein the first network energy-saving cell is a network energy-saving cell associated with the anchor cell.

[0610] In some embodiments, a redirection request message sent by the receiving terminal after establishing and / or restoring an RRC connection on an anchor cell is used to request the anchor cell to redirect the terminal to the first network energy-saving cell.

[0611] In some embodiments, the RRC connection establishment request message includes a first cause value, indicating that the reason the terminal establishes the RRC connection is that it needs to be redirected to the first network energy-saving cell; and / or the RRC connection restoration request message includes a first cause value, indicating that the reason the terminal resumes an RRC connection suspended in the anchor cell is that it needs to be redirected to the first network energy-saving cell. For example, an optional implementation method for anchor cell 102 to determine that the terminal needs to be redirected to the first network energy-saving cell may be as follows: determining that the terminal needs to be redirected to the first network energy-saving cell based on the first cause value. For optional implementation methods, refer to the relevant description of the above embodiments and are not further described here.

[0612] In some embodiments, the above-mentioned first cause value also indicates that the anchor cell establishes a signaling radio bearer SRB1 of type 1 for the terminal and / or performs an initial security activation process, and / or does not establish a signaling radio bearer SRB2 of type 2 and / or a data radio bearer DRB for the terminal.

[0613] In some embodiments, the anchor cell establishes a signaling radio bearer SRB1 of type 1 and / or performs an initial security activation process for the terminal, and / or does not establish a signaling radio bearer SRB2 of type 2 and / or a data radio bearer DRB for the terminal.

[0614] In some embodiments, the RRC connection establishment and / or restoration request message includes a second cause value; exemplarily, an optional implementation method for determining that the terminal needs to be redirected to the first network energy-saving cell includes: receiving a redirection request message sent by the terminal after establishing and / or restoring the RRC connection on the anchor cell; wherein the redirection request message is used to request the anchor cell to redirect the terminal to the first network energy-saving cell; based on the redirection request message, determining that the terminal needs to be redirected to the first network energy-saving cell.

[0615] In some embodiments, the second cause value is an RRC connection establishment cause value selected by the upper layer or access layer AS layer of the terminal from at least one existing RRC connection establishment cause value; or, the second cause value is an RRC connection recovery cause value selected by the upper layer or access layer AS layer of the terminal from at least one existing RRC connection recovery cause value.

[0616] In some embodiments, at least one existing RRC connection establishment cause value and / or RRC connection recovery cause value includes at least one of the following: emergency call; high priority access highPriityAccess; called access mt-Access; calling signaling mo-Signalling; calling data mo-Data; delay tolerant access delayTolerantAccess.

[0617] Step S4503: Send instruction information to the terminal, where the instruction information is used to instruct the terminal to redirect to the first network energy-saving cell.

[0618] In some embodiments, an RRC connection release message is sent to the terminal, the RRC connection release message is used to instruct the terminal to release the RRC connection, the RRC connection release message includes redirection indication information, and the redirection indication information includes indication information. Its optional implementation method can be found in the relevant description of the above embodiment and will not be repeated here.

[0619] In some embodiments, the above-mentioned indication information includes at least one of the following: information indicating the identity of the redirected cell; information indicating the frequency of the redirected cell; and information indicating whether the redirected cell is a network energy-saving cell.

[0620] In some embodiments, the anchor cell sends SIB information to the terminal, where the SIB information includes configuration information of one or more network energy-saving cells, and the anchor cell associated with the one or more network energy-saving cells is anchor cell 102. The SIB information is used by the terminal to obtain configuration information of the first network energy-saving cell in combination with the indication information. The configuration information of the first network energy-saving cell is used by the terminal to initiate a random access procedure on the first network energy-saving cell. Optional implementations thereof can be found in the relevant descriptions of the above embodiments and are not further described here.

[0621] In some embodiments, the configuration information of the first network energy-saving cell includes at least one of the following: the identifier and / or frequency of the first network energy-saving cell; the random access channel RACH related configuration information of the first network energy-saving cell; and the information in the SRB1 of the first network energy-saving cell.

[0622] In some embodiments, the first network energy-saving cell and the anchor cell have a neighboring cell relationship.

[0623] Figure 5 is an interactive diagram of an initial access method according to an embodiment of the present disclosure. As shown in Figure 5, the method involved in the embodiment of the present disclosure can be applied to a communication system 100, and the method includes but is not limited to the following steps.

[0624] In step S5101 , the terminal 101 establishes and / or restores a radio resource control (RRC) connection on the anchor cell 102 so that the anchor cell 102 redirects the terminal 101 to the first network energy-saving cell.

[0625] The optional implementation of step S5101 can refer to the optional implementation of step S3501 in Figure 3E and other related parts in the embodiment involved in Figure 3E, which will not be repeated here.

[0626] In step S5102 , the anchor cell 102 determines that the terminal 101 needs to be redirected to a first network energy-saving cell; wherein the first network energy-saving cell is a network energy-saving cell associated with the anchor cell 102 .

[0627] The optional implementation of step S5102 can refer to the optional implementation of step S4502 in Figure 4E and other related parts of the embodiment involved in Figure 4E, which will not be repeated here.

[0628] Step S5103: The anchor cell 102 sends instruction information to the terminal, where the instruction information is used to instruct the terminal to redirect to the first network energy-saving cell.

[0629] The optional implementation of step S5103 can refer to the optional implementation of step S3502 in Figure 3E, step S4503 in Figure 4E, and other related parts in the embodiments involved in Figures 3E and 4E, which will not be repeated here.

[0630] Step S5104: Terminal 101 initiates a random access process in the first network energy-saving cell.

[0631] The optional implementation of step S5103 can refer to the optional implementation of step S3503 in Figure 3E and other related parts in the embodiment involved in Figure 3E, which will not be repeated here.

[0632] In some embodiments, the above method may include the method described in the above terminal side, anchor cell side, etc. embodiments, which will not be repeated here.

[0633] In summary, the present disclosure proposes an initial access method in the process of redirecting an NES cell, which solves the problem that in the SSB / SIB1-less cell scenario, the terminal is redirected to the SSB / SIB1-less cell by redirection, and the terminal needs to first establish an RRC connection in the anchor cell (such as an anchor cell). The terminal is unclear about the establishmentcause value that should be used when establishing the RRC connection on the anchor cell.

[0634] In some embodiments, a new cause value is defined, and the terminal establishes an RRC connection on the anchor cell in order to redirect to the SSB / SIB1-less cell, and sets the establishmentcause to the new cause value.

[0635] Exemplarily, the new cause value may be named nes-PriorityAccess. Exemplarily, the new cause value may have other naming forms, which are not specifically limited in this disclosure. The new cause value is used to indicate to a network device (such as an anchor cell) that the reason for the terminal to establish an RRC connection is to redirect to an SSB / SIB1-less cell (NES cell).

[0636] Exemplarily, the purpose of the terminal establishing an RRC connection on the anchor cell is to allow the anchor cell to redirect the terminal to the SSB / SIB1-less cell, and the establishmentcause of the setuprequest message sent by the terminal on the anchor cell is set to the new cause value.

[0637] Exemplarily, by setting establishmentcause to a new cause value, the terminal can further indicate that the network device (such as the anchor cell) only needs to establish SRB1 and / or security activation for the terminal, and does not need the network device (such as the anchor cell) to establish SRB2 and / or DRB for the terminal.

[0638] Exemplarily, the anchor cell receives a setuprequest message sent by the terminal, determines that the establishmentcause is set to a new cause value, and determines that the terminal needs to be redirected to an SSB / SIB1-less cell. The anchor cell establishes SRB1 and / or security activation for the terminal, but does not establish SRB2 and / or DRB for the terminal. The anchor cell redirects the terminal to the SSB / SIB1-less cell through an RRCConnectionRelease message, exemplarily a redirectedCarrierInfo message.

[0639] In some embodiments, no new cause value is defined. The terminal establishes an RRC connection on the anchor cell in order to redirect to the SSB / SIB1-less cell. The terminal selects a cause value from existing cause values ​​according to implementation.

[0640] Exemplarily, no new cause value is defined. The purpose of the terminal establishing an RRC connection on the anchor cell is to allow the anchor cell to redirect the terminal to the SSB / SIB1-less cell. The establishmentcause of the setuprequest message sent by the terminal on the anchor cell is set to the existing cause value. The terminal selects one from the existing cause values ​​according to the implementation. Exemplarily, it can be a high-level implementation of the terminal or an AS layer implementation of the terminal.

[0641] In some embodiments, after establishing an RRC connection on the anchor cell, the terminal instructs the anchor cell to redirect itself to the SSB / SIB1-less cell.

[0642] Exemplarily, after the terminal establishes an RRC connection on the anchor cell, the terminal initiates a redirection request to the anchor cell through RRC signaling. Exemplarily, the RRC signaling can be named nes-RedirectRequest. Exemplarily, there can be other naming forms, which are not specifically limited in this disclosure.

[0643] Exemplarily, the terminal requests redirection to the SSB / SIB1-less cell through separate RRC signaling.

[0644] Exemplarily, the anchor cell receives the redirection request message, and the anchor cell redirects the terminal to the SSB / SIB1-less cell through an RRCConnectionRelease message, exemplarily a redirectedCarrierInfo message.

[0645] The present disclosure also provides an apparatus for implementing any of the above methods. For example, an apparatus is provided that includes units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided that includes units or modules for implementing each step performed by an anchor cell in any of the above methods.

[0646] It should be understood that the division of the various units or modules in the above device 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 device, 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.

[0647] In the embodiments of the present disclosure, the processor is a circuit with information 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. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by 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 and implementing 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.

[0648] Figure 6A is a schematic diagram of the structure of the terminal proposed in an embodiment of the present disclosure. As shown in Figure 6A, the terminal 6100 may include: at least one of a transceiver module 6101, a processing module 6102, etc. In some embodiments, the processing module is used to establish and / or restore a radio resource control RRC connection on the anchor cell so that the anchor cell redirects the terminal to the first network energy-saving cell; the first network energy-saving cell is a network energy-saving cell associated with the anchor cell; the transceiver module is used to receive indication information sent by the anchor cell, the indication information is used to instruct the terminal to redirect to the first network energy-saving cell; the processing module is also used to initiate a random access process on the first network energy-saving cell. Optionally, the transceiver module is used to execute at least one of the communication steps such as sending and / or receiving executed by the terminal 101 in any of the above methods (for example, step S2101, step S2102, step S2201, step S2202, step S2301, step S2302, step S2401, step S2402, but not limited to this), which will not be repeated here. Optionally, the above-mentioned processing module is used to execute at least one of the other steps (for example, step S2107, step S2108, step S2206, step S2207, step S2307, step S2308, step S2406, step S2407, but not limited to these) performed by the terminal device 102 in any of the above methods, which are not repeated here.

[0649] FIG6B is a schematic diagram of the structure of the anchor cell proposed in an embodiment of the present disclosure. As shown in FIG6B , the anchor cell 6200 may include: at least one of a transceiver module 6201 and a processing module 6202. In some embodiments, the transceiver module is configured to receive a radio resource control (RRC) connection establishment and / or restoration request message sent by a terminal, wherein the RRC connection establishment request message is used to request establishment of an RRC connection with the anchor cell, and the RRC connection restoration request message is used to request restoration of an RRC connection suspended in the anchor cell; the processing module is configured to determine that the terminal needs to be redirected to a first network energy-saving cell; wherein the first network energy-saving cell is a network energy-saving cell associated with the anchor cell; and the transceiver module is configured to send indication information to the terminal, wherein the indication information is used to instruct the terminal to redirect to the first network energy-saving cell. Optionally, the transceiver module is configured to execute at least one of the communication steps (e.g., step S2104, step S2106, step S2204, step S2205, step S2304, step S2306, step S2404, step S2405, but not limited thereto) such as sending and / or receiving performed by the anchor cell 6200 in any of the above methods, which are not described in detail here. Optionally, the processing module is configured to execute at least one of the other steps (e.g., step S2103, step S2105, step S2203, step S2303, step S2305, step S2403, but not limited thereto) performed by the anchor cell 102 in any of the above methods, which are not described in detail here.

[0650] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, and the transmitting module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0651] In some embodiments, the processing module can be a single module or can include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be interchangeable with the processor.

[0652] Figure 7A is a schematic diagram of the structure of a communication device 7100 proposed in an embodiment of the present disclosure. Communication device 7100 can be an anchor cell (e.g., an access network device, a core network device, etc.), a terminal (e.g., a user equipment, etc.), a chip, a chip system, or a processor that supports an anchor cell implementing any of the above methods, or a chip, a chip system, or a processor that supports a terminal implementing any of the above methods. Communication device 7100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0653] As shown in Figure 7A, the communication device 7100 includes one or more processors 7101. The processor 7101 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 the communication protocol and communication data, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. Optionally, the communication device 7100 is used to perform any of the above methods. Optionally, one or more processors 7101 are used to call instructions to enable the communication device 7100 to perform any of the above methods.

[0654] In some embodiments, the communication device 7100 further includes one or more transceivers 7102. When the communication device 7100 includes one or more transceivers 7102, the transceiver 7102 performs the communication steps such as sending and / or receiving in the above method (e.g., step S2101, step S2102, step S2201, step S2202, step S2301, step S2302, step S2401, step S2402, step S2104, step S2106, step S2204, step S2205, step S2304, step S2306, step S2407, step S2408, step S2409, step S2500, step S2501, step S2502, step S2504, step S2505, step S2506, step S2507, step S2508, step S2509, step S2501, step S2509, step S2501, step S2501, step S2502, step S2504, step S2506, step S2508 ...9, step S2501, step S2501 The processor 7101 executes at least one of the other steps (e.g., step S2107, step S2108, step S2206, step S2207, step S2307, step S2308, step S2406, step S2407, step S2103, step S2105, step S2203, step S2303, step S2305, step S2403, but not limited thereto). In an optional embodiment, the transceiver may include a receiver and / or a transmitter, and the receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, and interface may be interchangeable, the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be interchangeable, and the terms receiver, receiving unit, receiver, and receiving circuit may be interchangeable.

[0655] In some embodiments, the communication device 7100 further includes one or more memories 7103 for storing data. Alternatively, all or part of the memories 7103 may be located outside the communication device 7100. In alternative embodiments, the communication device 7100 may include one or more interface circuits 7104. Optionally, the interface circuits 7104 are connected to the memory 7102 and may be configured to receive data from the memory 7102 or other devices, or to send data to the memory 7102 or other devices. For example, the interface circuits 7104 may read data stored in the memory 7102 and send the data to the processor 7101.

[0656] The communication device 7100 described in the above embodiment may be an anchor cell or a terminal, but the scope of the communication device 7100 described in the present disclosure is not limited thereto, and the structure of the communication device 7100 may not be limited by FIG. 7A. 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.

[0657] 7B is a schematic diagram of the structure of a chip 7200 proposed in an embodiment of the present disclosure. If the communication device 7100 can be a chip or a chip system, please refer to the schematic diagram of the structure of the chip 7200 shown in FIG7B , but the present disclosure is not limited thereto.

[0658] The chip 7200 includes one or more processors 7201. The chip 7200 is configured to execute any of the above methods.

[0659] In some embodiments, chip 7200 further includes one or more interface circuits 7202. Alternatively, terms such as interface circuit, interface, and transceiver pins may be used interchangeably. In some embodiments, chip 7200 further includes one or more memories 7203 for storing data. Alternatively, all or part of memory 7203 may be located external to chip 7200. Optionally, interface circuit 7202 is connected to memory 7203 and may be used to receive data from memory 7203 or other devices, or may be used to send data to memory 7203 or other devices. For example, interface circuit 7202 may read data stored in memory 7203 and send the data to processor 7201.

[0660] In some embodiments, the interface circuit 7202 performs at least one of the communication steps such as sending and / or receiving in the above method (e.g., step xx, step xx, and step xx (all the sending and receiving steps in system Figure 2 are listed, but not limited to this). The interface circuit 7202 performing the communication steps such as sending and / or receiving in the above method, for example, means that the interface circuit 7202 performs data exchange between the processor 7201, chip 7200, memory 7203, or transceiver device. In some embodiments, the processor 7201 performs at least one of the other steps (e.g., step xx, step xx, and step xx (all other steps in system Figure 2 are listed, but not limited to this).

[0661] The present disclosure also proposes a storage medium having instructions stored thereon. When the instructions are executed on the communication device 7100, the communication device 7100 executes 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 is not limited thereto and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto and may also be a temporary storage medium.

[0662] The present disclosure also provides a program product, which, when executed by the communication device 7100, enables the communication device 7100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0663] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

[0664] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs. When the computer program is loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present disclosure are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0665] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0666] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0667] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. An initial access method, characterized in that: include: The terminal establishes and / or restores a radio resource control RRC connection on the anchor cell; The terminal receives indication information sent by the anchor cell, where the indication information is used to instruct the terminal to redirect to a first network energy-saving cell, where the first network energy-saving cell is a network energy-saving cell associated with the anchor cell; The terminal initiates a random access process on the first network energy-saving cell.

2. The method according to claim 1, characterized in that The terminal establishes and / or restores a radio resource control RRC connection on an anchor cell so that the anchor cell redirects the terminal to a first network energy-saving cell, including: The terminal sends an RRC connection establishment request message to the anchor cell; wherein the RRC connection establishment request message is used to request to establish the RRC connection with the anchor cell, and the RRC connection establishment request message includes a first cause value, and the first cause value indicates that the terminal needs to be redirected to the first network energy-saving cell.

3. The method according to claim 1, characterized in that The terminal establishes and / or restores a radio resource control RRC connection on an anchor cell so that the anchor cell redirects the terminal to a first network energy-saving cell, including: The terminal sends an RRC connection recovery request message to the anchor cell; wherein the RRC connection recovery request message is used to request the recovery of the RRC connection suspended in the anchor cell, and the RRC connection recovery request message includes a first cause value, and the first cause value indicates that the terminal needs to be redirected to the first network energy-saving cell.

4. The method according to claim 2 or 3, characterized in that The first cause value also indicates that the anchor cell establishes a signaling radio bearer SRB1 of type 1 for the terminal and / or performs an initial security activation process, and / or does not establish a signaling radio bearer SRB2 of type 2 and / or a data radio bearer DRB for the terminal.

5. The method according to any one of claims 2 to 4, characterized in that: The method further comprises: After establishing and / or restoring the RRC connection on the anchor cell, the terminal sends a redirection request message to the anchor cell; wherein the redirection request message is used to request the anchor cell to redirect the terminal to the first network energy-saving cell.

6. The method according to claim 1, characterized in that The terminal establishes and / or restores a radio resource control RRC connection on an anchor cell so that the anchor cell redirects the terminal to a first network energy-saving cell, including: The terminal sends an RRC connection establishment request message to the anchor cell; wherein the RRC connection establishment request message is used to request to establish the RRC connection with the anchor cell, and the RRC connection establishment request message includes a second cause value; After establishing the RRC connection on the anchor cell, the terminal sends a redirection request message to the anchor cell; wherein the redirection request message is used to request the anchor cell to redirect the terminal to the first network energy-saving cell.

7. The method according to claim 1, characterized in that The terminal establishes and / or restores a radio resource control RRC connection on an anchor cell so that the anchor cell redirects the terminal to a first network energy-saving cell, including: The terminal sends an RRC connection recovery request message to the anchor cell; wherein the RRC connection recovery request message is used to request recovery of the RRC connection suspended on the anchor cell, and the RRC connection recovery request message includes a second cause value; After the terminal resumes the RRC connection suspended on the anchor cell, the terminal sends a redirection request message to the anchor cell; wherein the redirection request message is used to request the anchor cell to redirect the terminal to the first network energy-saving cell.

8. The method according to claim 6 or 7, characterized in that The method further comprises at least one of the following: The terminal selects an RRC connection establishment cause value from at least one RRC connection establishment cause value as the second cause value; The terminal selects an RRC connection recovery cause value from at least one RRC connection recovery cause value as the second cause value.

9. The method according to claim 8, characterized in that The at least one RRC connection establishment cause value and / or RRC connection recovery cause value includes at least one of the following: Emergency call emergency; High priority access highPriorityAccess; The called party accesses mt-Access; mo-Signalling; Caller data mo-Data; Delay-tolerant access delayTolerantAccess.

10. The method according to any one of claims 1 to 9, characterized in that The receiving the indication information sent by the anchor cell includes: An RRC connection release message sent by the anchor cell is received, where the RRC connection release message is used to instruct the terminal to release the RRC connection, and the RRC connection release message includes the indication information.

11. The method according to any one of claims 1 to 10, characterized in that The initiating a random access process on the first network energy-saving cell includes: Obtaining configuration information of the energy-saving cell of the first network; A random access process is initiated on the first network energy-saving cell according to the configuration information of the first network energy-saving cell.

12. The method according to claim 11, characterized in that The acquiring the configuration information of the first network energy-saving cell includes at least one of the following: Acquire system information block SIB information of the anchor cell, where the SIB information includes configuration information of one or more network energy-saving cells, and acquire configuration information of a first network energy-saving cell in the SIB information according to the indication information and the SIB information; Acquire SIB information of the anchor cell, where the SIB information includes configuration information of one or more network energy-saving cells, and acquire configuration information of the first network energy-saving cell according to the SIB information of the anchor cell; According to the indication information, configuration information of the first network energy-saving cell is acquired.

13. The method according to any one of claims 1 to 12, characterized in that The indication information includes at least one of the following: Information indicating the identity of the redirecting cell; Information indicating the frequency of the redirected cell; Information indicating whether the redirected cell is a network energy-saving cell.

14. The method according to claim 13, characterized in that Acquiring configuration information of the first network energy-saving cell according to the indication information and the SIB information includes at least one of the following: According to the indication information, determining that the redirected cell is a network energy-saving cell; According to the indication information, acquiring an identifier and / or a frequency of the redirected cell; In the configuration information of one or more network energy-saving cells in the SIB information, the configuration information of the network energy-saving cell associated with the identifier and / or frequency point is determined as the configuration information of the first network energy-saving cell.

15. The method according to any one of claims 11 to 14, characterized in that The configuration information of the first network energy-saving cell includes at least one of the following: The identifier and / or frequency of the energy-saving cell of the first network; Configuration information related to the random access channel RACH of the first network energy-saving cell; Information in SRB1 of the first network energy-saving cell.

16. The method according to any one of claims 1 to 15, characterized in that The first network energy-saving cell and the anchor cell have a neighboring cell relationship.

17. An initial access method, characterized in that: include: The anchor cell receives a radio resource control RRC connection establishment and / or recovery request message sent by the terminal, wherein the RRC connection establishment request message is used to request to establish the RRC connection with the anchor cell, and the RRC connection recovery request message is used to request to recover the RRC connection suspended in the anchor cell; The anchor cell determines that the terminal needs to be redirected to a first network energy-saving cell; wherein the first network energy-saving cell is a network energy-saving cell associated with the anchor cell; The anchor cell sends indication information to the terminal, where the indication information is used to instruct the terminal to redirect to the first network energy-saving cell.

18. The method according to claim 17, characterized in that The RRC connection establishment request message includes a first cause value, and the first cause value indicates that the terminal needs to be redirected to the first network energy-saving cell; and / or the RRC connection recovery request message includes a first cause value, and the first cause value indicates that the terminal needs to be redirected to the first network energy-saving cell; The determining that the terminal needs to be redirected to the first network energy-saving cell includes: According to the first cause value, it is determined that the terminal needs to be redirected to the first network energy-saving cell.

19. The method according to claim 18, characterized in that The first cause value also indicates that the anchor cell establishes a signaling radio bearer SRB1 of type 1 for the terminal and / or performs an initial security activation process, and / or does not establish a signaling radio bearer SRB2 of type 2 and / or a data radio bearer DRB for the terminal.

20. The method of claim 19, wherein: The method further comprises: The anchor cell establishes a signaling radio bearer SRB1 of type 1 for the terminal and / or performs an initial security activation process, and / or does not establish a signaling radio bearer SRB2 of type 2 and / or a data radio bearer DRB for the terminal.

21. The method according to any one of claims 18 to 20, characterized in that The method further comprises: The anchor cell receives a redirection request message sent by the terminal after establishing and / or restoring the RRC connection on the anchor cell; wherein the redirection request message is used to request the anchor cell to redirect the terminal to the first network energy-saving cell.

22. The method of claim 17, wherein: The RRC connection establishment and / or restoration request message includes a second cause value; The determining that the terminal needs to be redirected to the first network energy-saving cell includes: receiving a redirection request message sent by the terminal after establishing and / or restoring the RRC connection on the anchor cell; wherein the redirection request message is used to request the anchor cell to redirect the terminal to the first network energy-saving cell; Based on the redirection request message, it is determined that the terminal needs to be redirected to the first network energy-saving cell.

23. The method of claim 22, wherein: The second cause value is an RRC connection establishment cause value selected by the terminal from at least one RRC connection establishment cause value; or, The second cause value is an RRC connection resumption cause value selected by the terminal from at least one RRC connection resumption cause value.

24. The method of claim 23, wherein: The at least one RRC connection establishment cause value and / or RRC connection recovery cause value includes at least one of the following: Emergency call emergency; High priority access highPriorityAccess; The called party accesses mt-Access; mo-Signalling; Caller data mo-Data; Delay-tolerant access delayTolerantAccess.

25. The method according to any one of claims 17 to 24, characterized in that The sending the indication information to the terminal includes: An RRC connection release message is sent to the terminal, where the RRC connection release message is used to instruct the terminal to release the RRC connection, and the RRC connection release message includes the indication information.

26. The method according to any one of claims 17 to 25, characterized in that The indication information includes at least one of the following: Information indicating the identity of the redirecting cell; Information indicating the frequency of the redirected cell; Information indicating whether the redirected cell is a network energy-saving cell.

27. The method according to any one of claims 17 to 26, characterized in that The method further comprises: Sending system information block SIB information to the terminal, wherein the SIB information includes configuration information of one or more network energy-saving cells.

28. The method of claim 27, wherein: The configuration information of the first network energy-saving cell includes at least one of the following: The identifier and / or frequency of the energy-saving cell of the first network; Configuration information related to the random access channel RACH of the first network energy-saving cell; Information in SRB1 of the first network energy-saving cell.

29. The method according to any one of claims 17 to 28, characterized in that The first network energy-saving cell and the anchor cell have a neighboring cell relationship.

30. A communication system, characterized in that: include: A terminal, configured to perform an initial access method according to any one of claims 1 to 16; The anchor cell is configured to execute the initial access method as described in any one of claims 17-29.

31. A first communication device, characterized in that: include: A processing module, used for establishing and / or restoring a radio resource control RRC connection on an anchor cell; a transceiver module, configured to receive indication information sent by the anchor cell, wherein the indication information is used to instruct the terminal to redirect to a first network energy-saving cell; the first network energy-saving cell is a network energy-saving cell associated with the anchor cell; The processing module is further used to initiate a random access process on the first network energy-saving cell.

32. A second communication device, characterized in that: include: A transceiver module, configured to receive a radio resource control RRC connection establishment and / or recovery request message sent by a terminal, wherein the RRC connection establishment request message is used to request to establish the RRC connection with an anchor cell, and the RRC connection recovery request message is used to request to recover the RRC connection suspended in the anchor cell; A processing module, configured to determine that the terminal needs to be redirected to a first network energy-saving cell; wherein the first network energy-saving cell is a network energy-saving cell associated with the anchor cell; The transceiver module is used to send indication information to the terminal, where the indication information is used to instruct the terminal to redirect to the first network energy-saving cell.

33. A communication device, characterized in that: include: one or more processors; The processor is used to call instructions so that the communication device executes the initial access method described in any one of claims 1-16 and 17-29.

34. A storage medium storing instructions, characterized in that: When the instruction is executed on a communication device, the communication device is caused to execute the initial access method according to any one of claims 1-16 and 17-29.

Images