Cell evaluation method, device, terminal, relay and storage medium

Abstract

The embodiments of the present application provide a cell evaluation method, device, terminal, relay and storage medium, which belong to the field of communication technology. The cell evaluation method of the embodiments of the present application includes: the remote terminal performs a cell selection or reselection evaluation in a first state; wherein, in the first state, the remote terminal has completed the selection or reselection of the relay, or, in the first state, the remote terminal has been connected to the relay.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to a cell evaluation method, device, terminal, relay and storage medium. Background Art

[0002] At present, in some communication systems (such as 5G systems), the terminal resides in a direct link. When the quality of the direct link is poor, the terminal may perform a cell selection or reselection evaluation. However, when the terminal has completed the selection or reselection of the relay, or when the terminal has been connected to the relay, the terminal will not perform the cell selection or reselection evaluation, resulting in poor communication reliability of the terminal. Summary of the invention

[0003] The embodiments of the present application provide a cell evaluation method, device, terminal, relay and storage medium, which can solve the problem of poor communication reliability of the terminal.

[0004] In a first aspect, a cell evaluation method is provided, comprising:

[0005] The remote terminal performs, in the first state, an evaluation of cell selection or reselection;

[0006] Wherein, in the first state, the remote terminal has completed the selection or reselection of the relay, or, in the first state, the remote terminal has been connected to the relay.

[0007] In a second aspect, a cell evaluation method is provided, comprising:

[0008] In the case where the relay is already connected to the remote terminal, the relay performs evaluation of cell selection or reselection;

[0009] In a case where the relay determines that a condition for cell selection or reselection is met, the relay performs cell selection or reselection;

[0010] Wherein, after performing the cell selection or reselection, the remote terminal is notified that the relay has performed the cell selection or reselection; or, the cell selection or reselection is performed after receiving confirmation from the remote terminal.

[0011] In a third aspect, a cell evaluation device is provided, and a remote terminal includes the device, including:

[0012] A first execution module, configured to execute an evaluation of cell selection or reselection in a first state;

[0013] Wherein, in the first state, the remote terminal has completed the selection or reselection of the relay, or, in the first state, the remote terminal has been connected to the relay.

[0014] In a fourth aspect, a cell evaluation device is provided, and a relay includes the device, including:

[0015] A first execution module, configured to execute evaluation of cell selection or reselection when the relay is already connected to the remote terminal;

[0016] A second execution module, configured to execute cell selection or reselection if the relay determines that a cell selection or reselection condition is met;

[0017] Wherein, after performing the cell selection or reselection, the remote terminal is notified that the relay has performed the cell selection or reselection; or, the cell selection or reselection is performed after receiving confirmation from the remote terminal.

[0018] In a fifth aspect, a terminal is provided, which is a remote terminal, including a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the remote terminal side cell evaluation method provided in the present application.

[0019] In a sixth aspect, a terminal is provided, the terminal being a remote terminal, comprising a processor and a communication interface, wherein the processor or the communication interface is used to: in a first state, perform an evaluation of cell selection or reselection;

[0020] Wherein, in the first state, the remote terminal has completed the selection or reselection of the relay, or, in the first state, the remote terminal has been connected to the relay.

[0021] In the seventh aspect, a relay is provided, comprising a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the cell evaluation method on the relay side provided in the present application.

[0022] In an eighth aspect, a relay is provided, comprising a processor and a communication interface, wherein the communication interface is used to:

[0023] When the relay is already connected to the remote terminal, performing cell selection or reselection evaluation;

[0024] If the relay determines that a condition for cell selection or reselection is met, performing cell selection or reselection;

[0025] Wherein, after performing the cell selection or reselection, the remote terminal is notified that the relay has performed the cell selection or reselection; or, the cell selection or reselection is performed after receiving confirmation from the remote terminal.

[0026] In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the cell evaluation method on the remote terminal side provided in the present application are implemented, or when the program or instruction is executed by a processor, the steps of the cell evaluation method on the relay side provided in the present application are implemented.

[0027] In the tenth aspect, a computer program / program product is provided, which is stored in a non-volatile storage medium, and the program / program product is executed by at least one processor to implement the steps of the uplink transmission method on the remote terminal side or the relay side provided in the present application.

[0028] In the embodiment of the present application, the remote terminal performs a cell selection or reselection evaluation in the first state; wherein, in the first state, the remote terminal has completed the selection or reselection of the relay, or, in the first state, the remote terminal has been connected to the relay. Since the remote terminal can perform the cell selection or reselection evaluation in the first state, the remote terminal can also perform the cell selection or reselection evaluation operation normally when communicating through the relay, thereby improving the communication reliability of the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A block diagram showing a wireless communication system to which the embodiments of the present application can be applied;

[0030] Figure 2 is a flow chart of a cell evaluation method provided in an embodiment of the present application;

[0031] Figure 3 is a flowchart of another cell evaluation method provided in an embodiment of the present application;

[0032] Figure 4 is a structural diagram of a cell evaluation device provided in an embodiment of the present application;

[0033] Figure 5 is a structural diagram of another cell evaluation device provided in an embodiment of the present application;

[0034] Figure 6 is a structural diagram of a communication device provided in an embodiment of the present application;

[0035] Figure 7 is a structural diagram of a terminal provided in an embodiment of the present application;

[0036] Figure 8 This is a structural diagram of a relay provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0038] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first" and "second" are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally represents that the objects associated with each other are in an "or" relationship.

[0039] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the above-mentioned systems and radio technologies as well as for other systems and radio technologies. The following description describes a new radio (NR) system for example purposes, and NR terms are used in most of the following descriptions. These technologies can also be applied to applications other than NR system applications, such as the 6th Generation (6G) communication system.

[0040] Figure 1A block diagram of a wireless communication system applicable to the embodiment of the present application is shown. The wireless communication system includes a remote terminal (remote UE) 11, a relay (Relay) 12 and a network side device 13.

[0041] The remote terminal 11 may also be referred to as a terminal device or a user terminal (UE). The remote terminal 11 may be a mobile phone, a tablet computer, a laptop computer, a personal digital assistant (PDA), a handheld computer, a netbook, an ultra-mobile personal computer (UMPC), a mobile Internet device (MID), a wearable device, a vehicle-mounted device (VUE), a pedestrian terminal (PUE), and other terminal-side devices. The wearable device includes: a smart watch, a bracelet, a headset, glasses, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application.

[0042] The relay 12 may be a dedicated relay device or a relay terminal (relay UE). The remote terminal 11 may be connected to the network side device 13 through one or more relays 12. It should be noted that when the remote terminal 11 is connected to the network side device 13 through multiple relays 12, the multiple relays 12 may adopt a serial transmission relationship, a parallel transmission relationship or other forms of transmission relationship. Figure 1 In the example of a relatively simple two-hop relay, one end of the relay 12 is connected to the remote terminal 11, and the other end is connected to the network side device 13. In addition, there is a Uu interface between the relay 12 and the network side device 13, and a sidelink (side link, or translated as side link, side link, etc.) interface, or PC5 interface, between the relay 12 and the remote terminal 11.

[0043] The network side device 13 can be a base station or a core network, wherein the base station can be referred to as a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a B node, an evolved B node (eNB), a home B node, a home evolved B node, a WLAN access point, a WiFi node, a transmitting and receiving point (Transmitting Receiving Point, TRP) or some other suitable term in the field. As long as the same technical effect is achieved, the base station is not limited to a specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

[0044] It should be noted that the above mainly takes the UE-to-network scenario as an example, and the remote terminal 11 communicates with the network side device 13 through the relay 12. In some implementations, the embodiments of the present application can also be applied to the UE-to-UE relay scenario, that is, the two ends of the relay 11 are connected to different terminals.

[0045] In addition, in the embodiment of the present application, the remote terminal 11 can also communicate directly with the network side device 13.

[0046] In conjunction with the accompanying drawings, a cell evaluation method, device, terminal, relay and storage medium provided in an embodiment of the present application are described in detail through some embodiments and their application scenarios.

[0047] See also Figure 2 , Figure 2 is a flowchart of a cell evaluation method provided in an embodiment of the present application, such as Figure 2 As shown, the following steps are included:

[0048] Step 201: The remote terminal performs a cell selection or reselection evaluation in a first state;

[0049] Wherein, in the first state, the remote terminal has completed the selection or reselection of the relay, or, in the first state, the remote terminal has been connected to the relay.

[0050] The above-mentioned that the remote terminal has completed the selection or reselection of the relay in the first state can be understood as that, in the case that the remote terminal has completed the selection or reselection of the relay, the remote terminal performs the evaluation of the cell selection or reselection.

[0051] The above-mentioned remote terminal being connected to the relay in the first state can be understood as, in the case where the remote terminal is already connected to the relay, the remote terminal performs evaluation of cell selection or reselection.

[0052] The evaluation of the cell selection or reselection may include: an evaluation of the cell selection or reselection based on the system information and the cell measurement result. Specifically, it may be searching for a cell and determining whether the searched cell meets the cell selection or reselection condition. For example, obtaining the system information of the cell, determining whether the cell is prohibited from attachment or access, and measuring the signal quality of the cell to determine whether the signal quality measurement result meets the preset requirements.

[0053] In the embodiment of the present application, the above steps can be used to implement the remote terminal to perform the evaluation of cell selection or reselection in the above first state, so that the remote terminal can also perform the evaluation operation of cell selection or reselection normally when communicating through the relay, thereby improving the communication reliability of the terminal. For example: performing cell selection or reselection according to the evaluation result, or performing relay selection or reselection.

[0054] As an optional implementation manner, the performing of the evaluation of cell selection or reselection includes:

[0055] The remote terminal performs a cell selection or reselection evaluation based on a direct link; or

[0056] The remote terminal performs cell selection or reselection evaluation based on an indirect link; or

[0057] The remote terminal performs evaluation of cell selection or reselection based on the direct link and the indirect link.

[0058] Among them, the direct link refers to the direct Uu link between the terminal and the network side device, and the indirect link refers to the indirect link in which the remote terminal is connected to the relay and then to the network side device.

[0059] The above-mentioned remote terminal performing the evaluation of cell selection or reselection based on the direct link may be that the remote terminal performs the evaluation of cell selection or reselection based on information acquired through the direct link.

[0060] The above-mentioned remote terminal performing the evaluation of cell selection or reselection based on the indirect link may be that the remote terminal performs the evaluation of cell selection or reselection based on information obtained through the indirect link.

[0061] The above-mentioned remote terminal performs evaluation of cell selection or reselection based on the direct link and the indirect link, which may be that the remote terminal performs evaluation of cell selection or reselection based on information obtained by the direct link and the indirect link.

[0062] In this implementation manner, the three methods described above can flexibly support the remote terminal to perform cell selection or reselection evaluation in the first state to meet the needs of different scenarios.

[0063] Optionally, the remote terminal performs cell selection or reselection evaluation based on the direct link, including:

[0064] The remote terminal performs a cell selection or reselection evaluation based on first system information and a first measurement result, wherein the first system information is system information received by the remote terminal based on a direct link, and the first measurement result is a measurement result of the remote terminal based on the direct link measurement.

[0065] The first system information may be system information sent by a network side device received by the remote terminal based on a direct link, and the system information is system information related to cell selection or reselection, such as system information block (SIB) 2, SIB3, SIB4, SIB5, etc. The remote terminal may determine whether the cell is prohibited from attachment or access based on the first system information.

[0066] The first measurement result is a measurement result of the local cell and / or the neighboring cell measured by the remote terminal on the direct link, such as reference signal received power (RSRP) and / or reference signal received quality (RSRQ). The remote terminal can determine whether the signal quality of the cell meets the preset condition based on the first measurement result.

[0067] In this implementation, it is possible to implement evaluation of cell selection or reselection based on system information and measurement results acquired through a direct link.

[0068] Optionally, the remote terminal performs cell selection or reselection evaluation based on the first system information and the first measurement result, including:

[0069] The remote terminal performs a cell selection or reselection evaluation based on the first system information and the first measurement result under a first condition, wherein the first condition includes at least one of the following:

[0070] The remote terminal is within the coverage of the cell;

[0071] The remote terminal can receive system information related to cell selection or reselection.

[0072] The above-mentioned remote terminal being able to receive system information related to cell selection or reselection may be that the terminal is able to receive the system information based on a direct link.

[0073] The above-mentioned system information related to cell selection or reselection is system information used for cell selection or reselection, such as SIB2, SIB3, SIB4, SIB5, etc.

[0074] In some implementations, the remote terminal may not perform the determination of the first condition, but directly perform the evaluation of cell selection or reselection based on the direct link.

[0075] Optionally, the remote terminal performs cell selection or reselection evaluation based on the indirect link, including:

[0076] The remote terminal performs a cell selection or reselection evaluation based on second system information and second measurement results, wherein the second system information is system information of the relay forwarding obtained by the remote terminal based on an indirect link, and the second measurement result is a measurement result of the relay measurement obtained by the remote terminal based on the indirect link.

[0077] The second system information may be system information of a network side device acquired by a relay and forwarded to a remote terminal. The second system information may be system information related to cell selection or reselection, such as SIB2, SIB3, SIB4, SIB5, etc.

[0078] The second measurement result may be a measurement result of the relay measuring the local cell and / or the neighboring cell and forwarded to the remote terminal. The local cell here may refer to the service cell of the relay or the service cell directly within the coverage of the remote terminal. The second measurement result may include RSRP and / or RSRQ.

[0079] In this implementation, it is possible to obtain system information and measurement results based on an indirect link and perform evaluation of cell selection or reselection.

[0080] Optionally, the remote terminal performs cell selection or reselection evaluation based on the second system information and the second measurement result, including:

[0081] The remote terminal performs cell selection or reselection evaluation based on the second system information and the second measurement result under the second condition, wherein the second condition includes at least one of the following:

[0082] The remote terminal is outside the coverage of the cell;

[0083] The remote terminal cannot receive system information related to cell selection or reselection based on the direct link.

[0084] In this implementation, it can be achieved that only when the above second condition is met, the evaluation of cell selection or reselection is performed based on the second system information and the second measurement result.

[0085] In some implementations, the remote terminal may not perform the determination of the second condition, but directly perform the evaluation of cell selection or reselection based on the indirect link.

[0086] Optionally, the remote terminal performs cell selection or reselection evaluation based on the direct link and the indirect link, including:

[0087] The remote terminal performs a cell selection or reselection evaluation based on third system information and a third measurement result, wherein the third system information is system information of the relay forwarding obtained by the remote terminal based on an indirect link, and the third measurement result is a measurement result of the remote terminal based on a direct link measurement.

[0088] Among them, the above-mentioned third system information can be system information of the network side device obtained by the relay and forwarded to the remote terminal. The above-mentioned third system information can be system information related to cell selection or reselection, such as SIB2, SIB3, SIB4, SIB5, etc.

[0089] The third measurement result is a measurement result of the local cell and / or neighboring cell measured by the remote terminal on the direct link, such as RSRP and / or RSRQ.

[0090] In this implementation, it is possible to implement evaluation of cell selection or reselection based on system information acquired through an indirect link and measurement results acquired through a direct link.

[0091] Optionally, the remote terminal performs cell selection or reselection evaluation based on the third system information and the third measurement result, including:

[0092] The remote terminal performs cell selection or reselection evaluation based on the third system information and the third measurement result under a third condition, wherein the third condition includes at least one of the following:

[0093] The remote terminal is outside the coverage of the cell;

[0094] The remote terminal cannot receive system information related to cell selection or reselection based on the direct link.

[0095] In this implementation, it can be achieved that only when the third condition is met, the evaluation of cell selection or reselection is performed based on the third system information and the third measurement result.

[0096] In some implementations, the remote terminal may not perform the determination of the third condition, but directly perform the evaluation of cell selection or reselection based on the direct link and the indirect link.

[0097] As an optional implementation, the method further includes:

[0098] In the case where the remote terminal determines that the cell selection or reselection condition is met, the remote terminal continues to reside on the indirect link between the remote terminal and the relay; or

[0099] In a case where the remote terminal determines that a cell selection or reselection condition is met, the remote terminal performs cell selection or reselection, resides on the direct link, and performs at least one of the following:

[0100] Notifying the relay that the remote terminal has performed cell selection or reselection;

[0101] triggering the release of the unicast link between the remote terminal and the relay;

[0102] When the selected or reselected cell and the serving cell of the relay connection are in different TAs or RNAs, triggering a corresponding TAU or RNAU procedure;

[0103] In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

[0104] The above-mentioned cell selection or reselection condition can be that the remote terminal determines the cell selection or reselection condition based on the acquired system information and measurement results. The cell selection or reselection condition can adopt the condition defined in the protocol or the condition newly defined in the subsequent protocol, which is not limited.

[0105] In the above implementation manner, after the above conditions are met, whether the remote terminal continues to reside on the indirect link between the remote terminal and the relay, or performs cell selection or reselection, and resides on the direct link can be specifically determined based on the implementation of the remote terminal, for example: according to the implementation configuration or requirements of the remote terminal, it is selected whether to reside on the indirect link between the remote terminal and the relay, or to choose to perform cell selection or reselection and reside on the direct link.

[0106] In this implementation, by notifying the relay that the remote terminal has performed cell selection or reselection, the relay can know that the remote terminal has performed cell selection or reselection, so that the relay can perform corresponding actions, such as: stopping forwarding all or part of the data to avoid transmitting resources.

[0107] In this implementation manner, by triggering the release of the unicast link between the remote terminal and the relay, transmission resources can be saved.

[0108] In this implementation, by triggering the corresponding TAU or RNAU process, it can be ensured that the terminal TA or RNA is real-time and timely, so as to improve the communication performance of the terminal.

[0109] It should be noted that the above implementation can be applied to all scenarios where evaluation of cell selection or reselection is performed. In addition, in some implementations, the remote terminal may not perform at least one of the following when performing cell selection or reselection and staying on the direct link:

[0110] Notifying the relay that the remote terminal has performed cell selection or reselection;

[0111] triggering the release of the unicast link between the remote terminal and the relay;

[0112] When the selected or reselected cell and the serving cell of the relay connection are in different TAs or RNAs, triggering a corresponding TAU or RNAU procedure;

[0113] In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

[0114] As an optional implementation, the method further includes:

[0115] When the remote terminal determines that a cell selection or reselection condition is met, performing at least one of the following:

[0116] Notifying the relay to select or reselect a cell;

[0117] Sending to the relay a target cell identifier for the relay to select or reselect a cell;

[0118] Reserving a unicast link between the remote terminal and the relay;

[0119] In the case where the selected or reselected cell does not belong to the TA or RNA of the remote terminal, triggering a corresponding TAU or RNAU process;

[0120] By notifying the relay to select or reselect a cell, it can be achieved that when the remote terminal determines that the conditions for cell selection or reselection are met, the relay selects or reselects a cell, thereby improving the communication reliability of the relay.

[0121] The target cell identifier may be a target cell selected or reselected by the remote terminal, and may specifically include at least one of the following:

[0122] Physical Cell ID (PCI), frequency information, NR Cell Identifier (NCI), NR Cell Global Identifier (NCGI).

[0123] By sending the target cell identifier for the relay to select or reselect a cell, the remote terminal can tell the relay the target cell for cell selection or reselection, so that the relay can quickly select or reselect the target cell.

[0124] In this implementation, since the relay can perform cell selection or reselection, the remote terminal and the relay can select or reselect another cell as a whole, which is equivalent to the remote terminal and the relay performing group cell reselection similar to group switching.

[0125] This implementation can be applied to a scenario where a remote terminal performs evaluation of cell selection or reselection based on an indirect link.

[0126] As an optional implementation, the method further includes:

[0127] When the remote terminal determines that a cell selection or reselection condition is met, performing at least one of the following:

[0128] Perform relay selection or reselection, wherein the serving cell of the selected or reselected relay is a target neighboring cell, wherein the target neighboring cell is a neighboring cell determined by performing cell selection or reselection;

[0129] In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

[0130] The cell to which the relay belongs may be known through a discovery message or other messages.

[0131] In this implementation, relay selection or reselection can be performed when the remote terminal determines that the conditions for cell selection or reselection are met, and since the serving cell is selected as the relay of the target neighboring cell, the communication quality of the remote terminal connected to the relay is improved.

[0132] It should be noted that, in some implementations, when the conditions for cell selection or reselection are met, relay selection or reselection is performed directly without considering whether the serving cell of the relay is the target neighboring cell.

[0133] In addition, the above-mentioned triggering of the corresponding TAU or RNAU process may be to trigger the selected or reselected relay to perform the TAU or RNAU process.

[0134] This implementation can be applied to a scenario where a remote terminal performs evaluation of cell selection or reselection based on an indirect link.

[0135] As an optional implementation, the method further includes:

[0136] The remote terminal performs relay selection or reselection evaluation in a second state, and does not perform cell selection or reselection evaluation, wherein the second state includes at least one of the following:

[0137] The remote terminal is outside the coverage of the cell;

[0138] The remote terminal cannot receive system information related to cell selection or reselection from the direct link.

[0139] This implementation can achieve that in the second state, the evaluation of cell selection or reselection is not performed, thereby avoiding the failure of the remote terminal to attempt to obtain system information from the direct link in the second state, thereby saving power consumption of the terminal. In addition, since the remote terminal performs the evaluation of relay selection or reselection in the second state, the remote terminal can perform relay selection or reselection to improve the communication reliability of the remote terminal.

[0140] As an optional implementation manner, in the first state, the remote terminal has been connected to the relay includes at least one of the following:

[0141] The remote terminal has established a Radio Resource Control (RRC) connection with the relay;

[0142] When the remote terminal is in an idle state or an inactive state, the remote terminal connects to the relay.

[0143] The above-mentioned remote terminal and the relay have established an RRC connection, which may include: the remote terminal and the relay have established an RRC connection, and the relay has established a Uu connection. In some implementations, it is also possible not to consider whether the relay has established a Uu connection.

[0144] In the above case where the remote terminal is in an idle state or an inactive state, connecting to the relay may be that after the remote terminal is released to the idle state or the inactive state by the network side device, the remote terminal is still connected to the relay.

[0145] In this implementation, the remote terminal can be supported to perform evaluation of cell selection or reselection in multiple states.

[0146] In the embodiment of the present application, the remote terminal performs an evaluation of cell selection or reselection in the first state; wherein, in the first state, the remote terminal has completed the selection or reselection of a relay, or, in the first state, the remote terminal has been connected to a relay. Since the remote terminal can perform the evaluation of cell selection or reselection in the first state, the communication reliability of the terminal can be improved.

[0147] See also Figure 3 , Figure 3 is a flowchart of another cell evaluation method provided in an embodiment of the present application. Figure 3 As shown, the following steps are included:

[0148] Step 301: When the relay is already connected to the remote terminal, the relay performs an evaluation of cell selection or reselection;

[0149] Step 302: When the relay determines that the conditions for cell selection or reselection are met, the relay performs cell selection or reselection;

[0150] Wherein, after performing the cell selection or reselection, the remote terminal is notified that the relay has performed the cell selection or reselection; or, the cell selection or reselection is performed after receiving confirmation from the remote terminal.

[0151] The relay performing the evaluation of cell selection or reselection may be that the relay performs the evaluation of cell selection or reselection based on the system information and measurement results acquired by the relay.

[0152] In this embodiment, since the remote terminal is notified that the relay has performed cell selection or reselection after performing cell selection or reselection, the remote terminal and the relay can be executed as a whole to select or reselect to another cell, thereby improving the communication reliability of the remote terminal.

[0153] The performing of cell selection or reselection after receiving the confirmation of the remote terminal may be that the confirmation of the remote terminal is received before performing the cell selection or reselection. Since the performing of cell selection or reselection is performed after receiving the confirmation of the remote terminal, the remote terminal and the relay can be executed as a whole to select or reselect to another cell, so as to improve the communication reliability of the remote terminal.

[0154] As an optional implementation manner, after the relay performs the step of evaluating cell selection or reselection, the method further includes at least one of the following:

[0155] The relay retains a unicast link between the relay and the remote terminal;

[0156] The relay notifies the remote terminal of an identifier of the cell selected or reselected by the relay.

[0157] The cell identifier may include at least one of the following:

[0158] PCI, frequency information, NCI, NCGI.

[0159] In this implementation, since the relay retains the unicast link between the relay and the remote terminal, the communication reliability of the remote terminal can be improved.

[0160] In addition, since the relay notifies the remote terminal of the identifier of the cell selected or reselected by the relay, the remote terminal obtains the identifier of the cell selected or reselected by the relay, so that the remote terminal can use the identifier to perform corresponding operations to improve the operating performance of the remote terminal.

[0161] As an optional implementation manner, after the relay performs the step of evaluating the cell selection or reselection, the method further includes:

[0162] The relay sends a request message to the remote terminal, wherein the request message is used to request the remote terminal to confirm whether to perform a cell selection or reselection process;

[0163] When the relay determines that a cell selection or reselection condition is met, the relay performs cell selection or reselection, including:

[0164] In a case where the relay determines that the conditions for cell selection or reselection are met and the remote terminal confirms to perform the cell selection or reselection process, the relay performs the cell selection or reselection.

[0165] The request message may be sent to the remote terminal before executing step 302 .

[0166] If the remote terminal sends a confirmation reply to the relay, step 302 is executed.

[0167] In this embodiment, since the remote terminal is notified that the relay has performed cell selection or reselection after performing cell selection or reselection, or the cell selection or reselection is performed after receiving confirmation from the remote terminal, it is possible to execute the remote terminal and the relay as a whole and select or reselect to another cell, thereby improving the communication reliability of the remote terminal.

[0168] The following is an example of the cell evaluation method provided in the embodiment of the present application through multiple embodiments:

[0169] Embodiment 1:

[0170] In this embodiment, an example is given in which a remote terminal performs cell selection evaluation on a direct link and directly measures the RSRP (or RSRQ) of the local cell and / or the RSRP (RSRQ) of a neighboring cell:

[0171] When at least one of the following conditions is met, the remote terminal performs subsequent operations:

[0172] The remote terminal is within the coverage area;

[0173] The remote terminal can obtain system information related to cell selection or reselection;

[0174] The above subsequent operations may include:

[0175] The remote terminal performs a cell selection or reselection evaluation (wherein the evaluation may include determining whether the cell is prohibited from being attached or accessed) based on the system information (such as SIB2, SIB3, SIB4, SIB5, etc.) for cell selection or reselection received through the direct link, and the remote terminal directly measures the RSRP (or RSRQ) of the current cell and / or neighboring cells through the direct link, and evaluates whether the relevant measurement results meet the cell selection or reselection conditions.

[0176] When the conditions for cell selection or reselection are met, the remote terminal performs one of the following actions:

[0177] Based on the terminal implementation, it decides whether to perform cell selection or reselection, or continue to stay under the indirect link of the relay.

[0178] Perform cell selection or reselection and reside directly on the direct link. Optionally, the remote terminal may perform at least one of the following actions:

[0179] Notify the relay that it has performed cell selection or reselection;

[0180] Triggering the release of the unicast link with the relay;

[0181] If the new cell is in a different TA or RNA from the serving cell of the relay connection, the corresponding TAU or RNAU procedure is triggered;

[0182] If the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

[0183] Embodiment 2:

[0184] This embodiment is described by taking the evaluation of cell selection or reselection performed by the remote terminal based on the system information forwarded by the relay as an example:

[0185] Solution 1: The remote terminal obtains parameters related to cell selection or reselection evaluation based on the system information forwarded by the relay, and directly measures the RSRP (or RSRQ) of the local cell and / or the RSRP (or RSRQ) of the neighboring cell;

[0186] When at least one of the following conditions is met, the remote terminal performs subsequent operations:

[0187] The remote terminal is out of coverage;

[0188] The remote terminal cannot obtain system information related to cell selection or reselection from the direct link.

[0189] The above subsequent operations may include:

[0190] The remote terminal performs a cell selection or reselection evaluation based on the system information related to cell selection or reselection (such as SIB2, SIB3, SIB4, SIB5, etc.) forwarded by the relay (wherein the evaluation may include determining whether the cell is prohibited from attachment or access), and the remote terminal directly measures the RSRP (or RSRQ) of the current cell and / or neighboring cells on the direct link, and evaluates whether the relevant measurement results meet the conditions for cell selection or reselection.

[0191] When the conditions for cell selection or reselection are met, the remote terminal performs one of the following actions:

[0192] Based on the terminal implementation, it decides whether to perform cell selection or reselection, or continue to stay under the indirect link of the relay.

[0193] Perform cell selection or reselection and reside directly on the direct link. Optionally, the remote terminal may perform at least one of the following actions:

[0194] Notify the relay that it has performed cell selection or reselection

[0195] Trigger the release of the unicast link with the relay

[0196] If the new cell is in a different TA or RNA from the serving cell of the relay connection, the corresponding TAU or RNAU procedure is triggered;

[0197] If the selected or reselected cell does not belong to the TA or RNA of the remote terminal, the corresponding TAU or RNAU process is triggered.

[0198] Solution 2: The remote terminal obtains parameters related to cell selection or reselection evaluation based on the system information forwarded by the relay, and determines whether the corresponding conditions are met based on the RSRP (or RSRQ) of the current cell and / or the RSRP (or RSRQ) of the neighboring cell forwarded by the relay.

[0199] At this time, the remote terminal performs a cell selection or reselection evaluation based on the system information (such as SIB2, SIB3, SIB4, SIB5, etc.) related to cell selection or reselection forwarded by the relay (wherein the evaluation may include determining whether the cell is prohibited from attachment or access), and at the same time evaluates whether the relevant measurement results meet the cell selection or reselection conditions based on the RSRP (or RSRQ) of the cell and / or the RSRP (or RSRQ) of the neighboring cell measured by the relay forwarded by the relay. In this case, the following three methods can be used:

[0200] Method 1:

[0201] When the conditions for cell selection or reselection are met, the remote terminal performs one of the following actions:

[0202] Based on the terminal implementation, it decides whether to perform cell selection or reselection, or continue to stay under the indirect link of the relay.

[0203] Perform cell selection or reselection and reside directly on the direct link. Optionally, the remote terminal may perform at least one of the following actions:

[0204] Notify the relay that it has performed cell selection or reselection;

[0205] Triggering the release of the unicast link with the relay;

[0206] If the new cell is in a different TA or RNA from the serving cell of the relay connection, the corresponding TAU or RNAU procedure is triggered;

[0207] If the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

[0208] Method 2:

[0209] When the conditions for cell selection or reselection are met, the remote terminal performs one of the following actions:

[0210] Notify the relay to reselect the cell;

[0211] The target cell identifier sent to the relay for cell reselection, where the cell identifier may include at least one of the following:

[0212] PCI, frequency information, NCI, NCGI.

[0213] Do not release the unicast link with the relay

[0214] At this time, the remote terminal and the relay perform a "group cell reselection" similar to a "group handover", that is, the remote terminal and the relay as a whole reselect to another cell that meets the conditions.

[0215] Method 3:

[0216] When the conditions for cell selection or reselection are met, the remote terminal performs one of the following actions:

[0217] Trigger Relay re-election;

[0218] During the relay reselection process, the remote terminal learns the cell to which the relay belongs through a discovery message or other messages, and selects a relay whose serving cell identifier is the target neighboring cell.

[0219] Embodiment three:

[0220] In this embodiment, the relay performs cell selection or reselection evaluation based on the system information related to cell selection or reselection received by the direct link, and the relay directly measures the RSRP (or RSRQ) of the cell and / or neighboring cells on the direct link.

[0221] At this time, the relay performs a cell selection or reselection evaluation based on the system information (such as SIB2, SIB3, SIB4, SIB5, etc.) for cell selection or reselection received by the direct link (wherein the evaluation may include determining whether the cell is prohibited from attachment or access), and the relay directly measures the RSRP (or RSRQ) of the cell and / or neighboring cells on the direct link.

[0222] When the conditions for cell selection or reselection are met, the relay performs one of the following actions:

[0223] Directly perform cell selection or reselection.

[0224] Send a request message to the remote terminal to ask whether to perform the cell selection or reselection process. If the remote terminal replies with a confirmation, the relay needs to perform at least one of the following actions:

[0225] The cell selection or reselection described above is performed directly.

[0226] Wherein, in the case of directly performing cell selection or reselection, optionally, the relay may perform at least one of the following actions:

[0227] Notify the remote terminal that it has performed cell selection or reselection;

[0228] The unicast link with the relay is not released;

[0229] Notify the remote terminal of the cell ID of the reselected cell, where the cell ID may include at least one of the following: PCI, frequency information, NCI, and NCGI.

[0230] The behavior of the remote terminal in all the solutions in the above three embodiments may occur in at least one of the following stages:

[0231] After the remote terminal completes the selection or reselection of the relay;

[0232] After the remote terminal establishes a PC5-RRC connection with the relay;

[0233] After the remote terminal establishes a PC5-RRC connection with the relay, and the relay establishes a Uu connection;

[0234] After the remote terminal is released to the IDLE / INACTIVE state by the network side device, the remote terminal is still connected to the relay.

[0235] In the embodiments of the present application, the following can be achieved:

[0236] The remote terminal determines whether it can receive system messages related to cell selection or reselection (e.g., based on signal quality) on the direct link. If it can, it performs cell selection or reselection evaluation based on parameters in the directly received system messages. If it cannot, it performs cell selection or reselection based on parameters in the system messages forwarded by the relay.

[0237] All cell selection reselections performed by the remote terminal after selecting the relay need to notify the remote terminal after completing the cell selection reselection, and may release the PC5-RRC connection;

[0238] The remote terminal evaluates the system information related to cell selection or reselection forwarded by the relay and the RSRP (or RSRQ) of the current cell and / or neighboring cells forwarded by the relay. If the conditions are met, the remote terminal triggers group cell reselection, and the remote terminal and the relay reselect to a new cell together;

[0239] The remote terminal evaluates the system information related to cell selection or reselection forwarded by the relay and the RSRP (or RSRQ) of the current cell and / or neighboring cell forwarded by the relay. If the conditions are met, the remote terminal triggers relay reselection and reselects to the serving cell whose identification is the target neighboring cell or above;

[0240] The relay performs an evaluation based on the system information related to cell selection or reselection and the RSRP (or RSRQ) of the cell and / or neighboring cells measured by itself. If the conditions are met, the relay and the remote terminal reselect to the new target cell together. Optionally, it can be executed after requesting the remote terminal and confirming it.

[0241] Through the embodiments of the present application, the remote terminal can normally perform the evaluation of cell selection reselection even when connected to the relay.

[0242] See also Figure 4 , Figure 4is a structural diagram of a cell evaluation device provided in an embodiment of the present application, and a remote terminal includes the device, such as Figure 4 As shown, including:

[0243] A first execution module 401, in a first state, performs evaluation of cell selection or reselection;

[0244] Wherein, in the first state, the remote terminal has completed the selection or reselection of the relay, or, in the first state, the remote terminal has been connected to the relay.

[0245] Optionally, the performing of the evaluation of cell selection or reselection includes:

[0246] The remote terminal performs a cell selection or reselection evaluation based on the direct link; or

[0247] The remote terminal performs cell selection or reselection evaluation based on the indirect link; or

[0248] The remote terminal performs evaluation of cell selection or reselection based on the direct link and the indirect link.

[0249] Optionally, the remote terminal performs cell selection or reselection evaluation based on the direct link, including:

[0250] The remote terminal performs a cell selection or reselection evaluation based on first system information and a first measurement result, wherein the first system information is system information received by the remote terminal based on a direct link, and the first measurement result is a measurement result of the remote terminal based on the direct link measurement.

[0251] Optionally, the remote terminal performs cell selection or reselection evaluation based on the first system information and the first measurement result, including:

[0252] The remote terminal performs a cell selection or reselection evaluation based on the first system information and the first measurement result under a first condition, wherein the first condition includes at least one of the following:

[0253] The remote terminal is within the coverage of the cell;

[0254] The remote terminal can receive system information related to cell selection or reselection.

[0255] Optionally, the remote terminal performs cell selection or reselection evaluation based on the indirect link, including:

[0256] The remote terminal performs a cell selection or reselection evaluation based on second system information and second measurement results, wherein the second system information is system information of the relay forwarding obtained by the remote terminal based on an indirect link, and the second measurement result is a measurement result of the relay measurement obtained by the remote terminal based on the indirect link.

[0257] Optionally, the remote terminal performs cell selection or reselection evaluation based on the second system information and the second measurement result, including:

[0258] The remote terminal performs cell selection or reselection evaluation based on the second system information and the second measurement result under the second condition, wherein the second condition includes at least one of the following:

[0259] The remote terminal is outside the coverage of the cell;

[0260] The remote terminal cannot receive system information related to cell selection or reselection based on the direct link.

[0261] Optionally, the remote terminal performs cell selection or reselection evaluation based on the direct link and the indirect link, including:

[0262] The remote terminal performs a cell selection or reselection evaluation based on third system information and a third measurement result, wherein the third system information is system information of the relay forwarding obtained by the remote terminal based on an indirect link, and the third measurement result is a measurement result of the remote terminal based on a direct link measurement.

[0263] Optionally, the remote terminal performs cell selection or reselection evaluation based on the third system information and the third measurement result, including:

[0264] The remote terminal performs cell selection or reselection evaluation based on the third system information and the third measurement result under a third condition, wherein the third condition includes at least one of the following:

[0265] The remote terminal is outside the coverage of the cell;

[0266] The remote terminal cannot receive system information related to cell selection or reselection based on the direct link.

[0267] Optionally, the device further comprises:

[0268] A first resident module is configured to continue to reside on the indirect link between the remote terminal and the relay when the remote terminal determines that a cell selection or reselection condition is met; or

[0269] The second resident module is configured to, when the remote terminal determines that a cell selection or reselection condition is met, perform cell selection or reselection, reside on the direct link, and perform at least one of the following:

[0270] Notifying the relay that the remote terminal has performed cell selection or reselection;

[0271] triggering the release of the unicast link between the remote terminal and the relay;

[0272] In the case where the selected or reselected cell and the serving cell of the relay connection are in different tracking areas TA or radio access network notification areas RNA, triggering a corresponding tracking area update TAU or radio access network notification area update RNAU process;

[0273] In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

[0274] Optionally, the device further comprises:

[0275] The second execution module is configured to execute at least one of the following items when the remote terminal determines that a cell selection or reselection condition is met:

[0276] Notifying the relay to select or reselect a cell;

[0277] Sending to the relay a target cell identifier for the relay to select or reselect a cell;

[0278] Reserving a unicast link between the remote terminal and the relay;

[0279] In the case where the selected or reselected cell does not belong to the TA or RNA of the remote terminal, triggering a corresponding TAU or RNAU process;

[0280] Optionally, the device further comprises:

[0281] The third execution module is configured to execute at least one of the following items when the remote terminal determines that the cell selection or reselection condition is met:

[0282] Perform relay selection or reselection, wherein the serving cell of the selected or reselected relay is a target neighboring cell, wherein the target neighboring cell is a neighboring cell determined by performing cell selection or reselection;

[0283] In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

[0284] Optionally, the device further comprises:

[0285] An evaluation module, configured to perform relay selection or reselection evaluation in a second state, and not perform cell selection or reselection evaluation, wherein the second state includes at least one of the following:

[0286] The remote terminal is outside the coverage of the cell;

[0287] The remote terminal cannot receive system information related to cell selection or reselection from the direct link.

[0288] Optionally, in the first state, the remote terminal has been connected to the relay, including at least one of the following:

[0289] The remote terminal has established a radio resource control RRC connection with the relay;

[0290] When the remote terminal is in an idle state or an inactive state, the remote terminal connects to the relay.

[0291] Optionally, the remote terminal has established an RRC connection with the relay, including:

[0292] The remote terminal has established an RRC connection with the relay, and the relay has established a Uu connection.

[0293] The cell evaluation device in the embodiment of the present application can improve the communication reliability of the terminal.

[0294] The information transmission device in the embodiment of the present application can be a device, a device or electronic device with an operating system, or a component, an integrated circuit, or a chip in a terminal. The device or electronic device can be a mobile terminal or a non-mobile terminal. Exemplarily, the mobile terminal can include but is not limited to the types of terminals 11 listed above, and the non-mobile terminal can be a server, a network attached storage (Network Attached Storage, NAS), a personal computer (personal computer, PC), a television (television, TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

[0295] The information transmission device provided in the embodiment of the present application can achieve Figure 2 The various processes implemented by the method embodiment and achieving the same technical effect are not described here to avoid repetition.

[0296] See also Figure 5 , Figure 5 is a structural diagram of a cell evaluation device provided in an embodiment of the present application, wherein the relay includes the device, such as Figure 5 As shown, including:

[0297] A first execution module 501 is used to perform cell selection or reselection evaluation when the relay is already connected to the remote terminal;

[0298] A second execution module 502, configured to execute cell selection or reselection if the relay determines that a cell selection or reselection condition is met;

[0299] Wherein, after performing the cell selection or reselection, the remote terminal is notified that the relay has performed the cell selection or reselection; or, the cell selection or reselection is performed after receiving confirmation from the remote terminal.

[0300] Optionally, the device further comprises at least one of the following:

[0301] A reservation module, used for reserving a unicast link between the relay and the remote terminal;

[0302] The notification module is used to notify the remote terminal of the identifier of the cell selected or reselected by the relay.

[0303] Optionally, the device further comprises:

[0304] A sending module, used to send a request message to the remote terminal, wherein the request message is used to request the remote terminal to confirm whether to perform a cell selection or reselection process;

[0305] The second execution module 502 is configured to cause the relay to execute cell selection or reselection when the relay determines that a cell selection or reselection condition is met and the remote terminal confirms to execute the cell selection or reselection process.

[0306] The cell evaluation device in the embodiment of the present application can improve the communication reliability of the terminal.

[0307] The information transmission device in the embodiment of the present application can be a device, a device or an electronic device with an operating system, or a component, an integrated circuit, or a chip in a relay.

[0308] The information transmission device provided in the embodiment of the present application can achieve Figure 2 The various processes implemented by the method embodiment and achieving the same technical effect are not described here to avoid repetition.

[0309] Optional, such as Figure 6As shown, the embodiment of the present application also provides a communication device 600, including a processor 601, a memory 602, and a program or instruction stored in the memory 602 and executable on the processor 601. For example, when the communication device 600 is a remote terminal, the program or instruction is executed by the processor 601 to implement the various processes of the above-mentioned cell evaluation method embodiment on the remote terminal side, and the same technical effect can be achieved. For example, when the communication device 600 is a relay, the program or instruction is executed by the processor 601 to implement the various processes of the above-mentioned cell evaluation method embodiment on the relay side, and the same technical effect can be achieved.

[0310] The embodiment of the present application further provides a terminal, which is a remote terminal, including a processor and a communication interface, wherein the processor or the communication interface is used to: in a first state, perform an evaluation of cell selection or reselection;

[0311] Wherein, in the first state, the remote terminal has completed the selection or reselection of the relay, or, in the first state, the remote terminal has been connected to the relay.

[0312] This embodiment corresponds to the above method embodiment, and each implementation process and implementation method of the above method embodiment can be applied to this embodiment and can achieve the same technical effect. Specifically, Figure 7 A schematic diagram of the hardware structure of a terminal for implementing an embodiment of the present application.

[0313] The terminal 700 includes but is not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709, and at least some of the components of a processor 710.

[0314] Those skilled in the art will appreciate that the terminal 700 may also include a power source (such as a battery) for supplying power to various components, and the power source may be logically connected to the processor 710 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Figure 2 The terminal structure shown in the figure does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0315] It should be understood that in the embodiment of the present application, the input unit 704 may include a graphics processor (Graphics Processing Unit, GPU) 7041 and a microphone 7042, and the graphics processor 7041 processes the image data of the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 706 may include a display panel 7061, and the display panel 7061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 707 includes a touch panel 7071 and other input devices 7072. The touch panel 7071 is also called a touch screen. The touch panel 7071 may include two parts: a touch detection device and a touch controller. Other input devices 7072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0316] In the embodiment of the present application, the radio frequency unit 701 receives downlink data from the network side device and sends it to the processor 710 for processing; in addition, the uplink data is sent to the network side device. Generally, the radio frequency unit 701 includes but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0317] The memory 709 can be used to store software programs or instructions and various data. The memory 709 can mainly include a program or instruction storage area and a data storage area, wherein the program or instruction storage area can store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 709 can include a high-speed random access memory, and can also include a non-volatile memory, wherein the non-volatile memory can be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM, PROM), an erasable programmable read-only memory (Erasable PROM, EPROM), an electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or a flash memory. For example, at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0318] The processor 710 may include one or more processing units; optionally, the processor 710 may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and application programs or instructions, etc., and the modem processor mainly processes wireless communications, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 710.

[0319] The radio frequency unit 701 or the processor 710 is configured to perform an evaluation of cell selection or reselection in a first state;

[0320] Wherein, in the first state, the remote terminal has completed the selection or reselection of the relay, or, in the first state, the remote terminal has been connected to the relay.

[0321] Optionally, the performing of the evaluation of cell selection or reselection includes:

[0322] performing evaluation of cell selection or reselection based on the direct link; or

[0323] performing an evaluation for cell selection or reselection based on an indirect link; or

[0324] Based on the direct link and the indirect link, an evaluation of cell selection or reselection is performed.

[0325] Optionally, the performing the evaluation of cell selection or reselection based on the direct link includes:

[0326] Based on first system information and a first measurement result, an evaluation of cell selection or reselection is performed, wherein the first system information is system information received by the remote terminal based on a direct link, and the first measurement result is a measurement result measured by the remote terminal based on the direct link.

[0327] Optionally, the performing the evaluation of cell selection or reselection based on the first system information and the first measurement result includes:

[0328] Under a first condition, based on the first system information and the first measurement result, performing evaluation of cell selection or reselection, wherein the first condition includes at least one of the following:

[0329] The remote terminal is within the coverage of the cell;

[0330] The remote terminal can receive system information related to cell selection or reselection.

[0331] Optionally, the performing the evaluation of cell selection or reselection based on the indirect link includes:

[0332] Based on the second system information and the second measurement result, an evaluation of cell selection or reselection is performed, wherein the second system information is the system information of the relay forwarding obtained by the remote terminal based on an indirect link, and the second measurement result is the measurement result of the relay measurement obtained by the remote terminal based on the indirect link.

[0333] Optionally, the performing the evaluation of cell selection or reselection based on the second system information and the second measurement result includes:

[0334] Under a second condition, based on the second system information and the second measurement result, performing evaluation of cell selection or reselection, wherein the second condition includes at least one of the following:

[0335] The remote terminal is outside the coverage of the cell;

[0336] The remote terminal cannot receive system information related to cell selection or reselection based on the direct link.

[0337] Optionally, the performing the evaluation of cell selection or reselection based on the direct link and the indirect link includes:

[0338] Based on third system information and a third measurement result, an evaluation of cell selection or reselection is performed, wherein the third system information is system information of the relay forwarding obtained by the remote terminal based on an indirect link, and the third measurement result is a measurement result of the remote terminal based on a direct link measurement.

[0339] Optionally, the performing the evaluation of cell selection or reselection based on the third system information and the third measurement result includes:

[0340] Under a third condition, based on the third system information and the third measurement result, performing evaluation of cell selection or reselection, wherein the third condition includes at least one of the following:

[0341] The remote terminal is outside the coverage of the cell;

[0342] The remote terminal cannot receive system information related to cell selection or reselection based on the direct link.

[0343] Optionally, the radio frequency unit 701 or the processor 710 is further configured to:

[0344] If the remote terminal determines that the cell selection or reselection condition is met, continue to reside on the indirect link between the remote terminal and the relay; or

[0345] When the remote terminal determines that a cell selection or reselection condition is met, the remote terminal performs cell selection or reselection, resides on the direct link, and performs at least one of the following:

[0346] Notifying the relay that the remote terminal has performed cell selection or reselection;

[0347] triggering the release of the unicast link between the remote terminal and the relay;

[0348] In the case where the selected or reselected cell and the serving cell of the relay connection are in different tracking areas TA or radio access network notification areas RNA, triggering a corresponding tracking area update TAU or radio access network notification area update RNAU process;

[0349] In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

[0350] Optionally, the radio frequency unit 701 or the processor 710 is further configured to:

[0351] When the remote terminal determines that a cell selection or reselection condition is met, performing at least one of the following:

[0352] Notifying the relay to select or reselect a cell;

[0353] Sending to the relay a target cell identifier for the relay to select or reselect a cell;

[0354] Reserving a unicast link between the remote terminal and the relay;

[0355] In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

[0356] Optionally, the radio frequency unit 701 or the processor 710 is further configured to:

[0357] When the remote terminal determines that a cell selection or reselection condition is met, performing at least one of the following:

[0358] Perform relay selection or reselection, wherein the serving cell of the selected or reselected relay is a target neighboring cell, wherein the target neighboring cell is a neighboring cell determined by performing cell selection or reselection;

[0359] In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

[0360] Optionally, the radio frequency unit 701 or the processor 710 is further configured to:

[0361] The remote terminal performs relay selection or reselection evaluation in a second state, and does not perform cell selection or reselection evaluation, wherein the second state includes at least one of the following:

[0362] The remote terminal is outside the coverage of the cell;

[0363] The remote terminal cannot receive system information related to cell selection or reselection from the direct link.

[0364] Optionally, in the first state, the remote terminal has been connected to the relay, including at least one of the following:

[0365] The remote terminal has established a radio resource control RRC connection with the relay;

[0366] When the remote terminal is in an idle state or an inactive state, the remote terminal connects to the relay.

[0367] Optionally, the remote terminal has established an RRC connection with the relay, including:

[0368] The remote terminal has established an RRC connection with the relay, and the relay has established a Uu connection.

[0369] The terminal in the embodiment of the present application can improve the communication reliability performance of the terminal.

[0370] Specifically, the terminal of the embodiment of the present invention further includes: instructions or programs stored in the memory 709 and executable on the processor 710, and the processor 710 calls the instructions or programs in the memory 709 to execute Figure 4 The methods executed by the modules shown achieve the same technical effects, and therefore will not be described here in detail to avoid repetition.

[0371] The embodiment of the present application further provides a relay, including a processor and a communication interface, wherein the communication interface is used to:

[0372] When the relay is already connected to the remote terminal, performing cell selection or reselection evaluation;

[0373] If the relay determines that a condition for cell selection or reselection is met, performing cell selection or reselection;

[0374] Wherein, after performing the cell selection or reselection, the remote terminal is notified that the relay has performed the cell selection or reselection; or, the cell selection or reselection is performed after receiving confirmation from the remote terminal.

[0375] This embodiment corresponds to the above method embodiment, and each implementation process and implementation method of the above method embodiment can be applied to this embodiment and can achieve the same technical effect. Specifically, Figure 8 A schematic diagram of the hardware structure of a relay to implement an embodiment of the present application.

[0376] The relay 800 includes but is not limited to: a radio frequency unit 801, a network module 802, an audio output unit 803, an input unit 804, a sensor 805, a display unit 806, a user input unit XXX, an interface unit 808, a memory 809, and at least some of the components of the processor 810.

[0377] Those skilled in the art will appreciate that the relay 800 may also include a power source (such as a battery) for supplying power to each component, and the power source may be logically connected to the processor 810 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Figure 2 The relay structure shown in the figure does not constitute a limitation on the relay. The relay may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components, which will not be described in detail here.

[0378] It should be understood that in the embodiment of the present application, the input unit 804 may include a graphics processor (Graphics Processing Unit, GPU) 8041 and a microphone 8042, and the graphics processor 8041 processes the image data of the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 806 may include a display panel 8061, and the display panel 8061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit XXX includes a touch panel XXX1 and other input devices XXX2. The touch panel XXX1 is also called a touch screen. The touch panel XXX1 may include two parts: a touch detection device and a touch controller. Other input devices XXX2 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0379] In the embodiment of the present application, the radio frequency unit 801 receives downlink data from the network side device and sends it to the processor 810 for processing; in addition, the uplink data is sent to the network side device. Generally, the radio frequency unit 801 includes but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0380] The memory 809 can be used to store software programs or instructions and various data. The memory 809 can mainly include a program or instruction storage area and a data storage area, wherein the program or instruction storage area can store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 809 can include a high-speed random access memory, and can also include a non-volatile memory, wherein the non-volatile memory can be a read-only memory (Read-Only Memory, ROM), a programmable read-only memory (Programmable ROM, PROM), an erasable programmable read-only memory (Erasable PROM, EPROM), an electrically erasable programmable read-only memory (Electrically EPROM, EEPROM) or a flash memory. For example, at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0381] The processor 810 may include one or more processing units; optionally, the processor 810 may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and application programs or instructions, etc., and the modem processor mainly processes wireless communications, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 810.

[0382] The radio frequency unit 801 or the processor 810 is configured to perform evaluation of cell selection or reselection when the relay is already connected to the remote terminal;

[0383] If the relay determines that a condition for cell selection or reselection is met, performing cell selection or reselection;

[0384] Wherein, after performing the cell selection or reselection, the remote terminal is notified that the relay has performed the cell selection or reselection; or, the cell selection or reselection is performed after receiving confirmation from the remote terminal.

[0385] Optionally, after the relay performs the evaluation of cell selection or reselection, the radio frequency unit 801 or the processor 810 is further configured to perform at least one of the following:

[0386] Reserving a unicast link between the relay and the remote terminal;

[0387] The remote terminal is notified of the identifier of the cell selected or reselected by the relay.

[0388] Optionally, after the relay performs the evaluation of cell selection or reselection, the radio frequency unit 801 is further configured to:

[0389] Sending a request message to the remote terminal, wherein the request message is used to request the remote terminal to confirm whether to perform a cell selection or reselection process;

[0390] The performing of cell selection or reselection when the relay determines that a cell selection or reselection condition is met includes:

[0391] When the relay determines that the conditions for cell selection or reselection are met and the remote terminal confirms to perform the cell selection or reselection process, the cell selection or reselection is performed.

[0392] The relay in the embodiment of the present application can improve the communication reliability performance of the terminal.

[0393] Specifically, the relay of the embodiment of the present invention also includes: an instruction or program stored in the memory 809 and executable on the processor 810, and the processor 810 calls the instruction or program in the memory 809 to execute Figure 5 The methods executed by the modules shown achieve the same technical effects, and therefore will not be described here in detail to avoid repetition.

[0394] It should be noted that in Figure 8 In the corresponding embodiment, the relay is taken as a relay terminal for illustration, and the specific structure of the relay is not limited in the embodiment of the present application. For example, the relay can also be a special relay device or a relay node.

[0395] An embodiment of the present application further provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned cell evaluation method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0396] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0397] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned cell evaluation method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0398] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0399] An embodiment of the present application also provides a computer program product stored in a readable storage medium. The computer program product is executed by at least one processor to implement the various processes of the above-mentioned cell evaluation method embodiment and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0400] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0401] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0402] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A cell evaluation method, characterized in that: include: The remote terminal performs, in the first state, an evaluation of cell selection or reselection; Wherein, in the first state, the remote terminal has completed the selection or reselection of the relay, or, in the first state, the remote terminal has been connected to the relay; The method further comprises: In the case where the remote terminal determines that the cell selection or reselection condition is met, the remote terminal continues to reside on the indirect link between the remote terminal and the relay; or In a case where the remote terminal determines that a condition for cell selection or reselection is met, the remote terminal performs cell selection or reselection, resides on the direct link, and performs at least one of the following: Notifying the relay that the remote terminal has performed cell selection or reselection; triggering the release of the unicast link between the remote terminal and the relay; In the case where the selected or reselected cell and the serving cell of the relay connection are in different tracking areas TA or radio access network notification areas RNA, triggering a corresponding tracking area update TAU or radio access network notification area update RNAU process; In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

2. The method according to claim 1, characterized in that The performing of the evaluation of cell selection or reselection includes: The remote terminal performs a cell selection or reselection evaluation based on the direct link; or The remote terminal performs cell selection or reselection evaluation based on the indirect link; or The remote terminal performs evaluation of cell selection or reselection based on the direct link and the indirect link.

3. The method according to claim 2, characterized in that The remote terminal performs a cell selection or reselection evaluation based on the direct link, including: The remote terminal performs a cell selection or reselection evaluation based on first system information and a first measurement result, wherein the first system information is system information received by the remote terminal based on a direct link, and the first measurement result is a measurement result of the remote terminal based on the direct link measurement.

4. The method according to claim 3, characterized in that The remote terminal performs cell selection or reselection evaluation based on the first system information and the first measurement result, including: The remote terminal performs a cell selection or reselection evaluation based on the first system information and the first measurement result under a first condition, wherein the first condition includes at least one of the following: The remote terminal is within the coverage of the cell; The remote terminal can receive system information related to cell selection or reselection.

5. The method according to claim 2, characterized in that The remote terminal performs a cell selection or reselection evaluation based on the indirect link, including: The remote terminal performs a cell selection or reselection evaluation based on second system information and second measurement results, wherein the second system information is system information of the relay forwarding obtained by the remote terminal based on an indirect link, and the second measurement result is a measurement result of the relay measurement obtained by the remote terminal based on the indirect link.

6. The method according to claim 5, characterized in that The remote terminal performs cell selection or reselection evaluation based on the second system information and the second measurement result, including: The remote terminal performs cell selection or reselection evaluation based on the second system information and the second measurement result under the second condition, wherein the second condition includes at least one of the following: The remote terminal is outside the coverage of the cell; The remote terminal cannot receive system information related to cell selection or reselection based on the direct link.

7. The method according to claim 2, characterized in that The remote terminal performs evaluation of cell selection or reselection based on the direct link and the indirect link, including: The remote terminal performs a cell selection or reselection evaluation based on third system information and a third measurement result, wherein the third system information is system information of the relay forwarding obtained by the remote terminal based on an indirect link, and the third measurement result is a measurement result of the remote terminal based on a direct link measurement.

8. The method according to claim 7, characterized in that The remote terminal performs cell selection or reselection evaluation based on the third system information and the third measurement result, including: The remote terminal performs cell selection or reselection evaluation based on the third system information and the third measurement result under a third condition, wherein the third condition includes at least one of the following: The remote terminal is outside the coverage of the cell; The remote terminal cannot receive system information related to cell selection or reselection based on the direct link.

9. The method according to claim 2, 5 or 6, characterized in that: The method further comprises: When the remote terminal determines that a cell selection or reselection condition is met, performing at least one of the following: Notifying the relay to select or reselect a cell; Sending to the relay a target cell identifier for the relay to select or reselect a cell; Reserving a unicast link between the remote terminal and the relay; In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

10. The method according to claim 2, 5 or 6, characterized in that The method further comprises: When the remote terminal determines that a cell selection or reselection condition is met, performing at least one of the following: Perform relay selection or reselection, wherein the serving cell of the selected or reselected relay is a target neighboring cell, wherein the target neighboring cell is a neighboring cell determined by performing cell selection or reselection; In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

11. The method according to any one of claims 1 to 8, characterized in that The method further comprises: The remote terminal performs relay selection or reselection evaluation in a second state, and does not perform cell selection or reselection evaluation, wherein the second state includes at least one of the following: The remote terminal is outside the coverage of the cell; The remote terminal cannot receive system information related to cell selection or reselection from the direct link.

12. The method according to any one of claims 1 to 8, characterized in that In the first state, the remote terminal has been connected to the relay, which includes at least one of the following: The remote terminal has established a radio resource control RRC connection with the relay; When the remote terminal is in an idle state or an inactive state, the remote terminal connects to the relay.

13. The method according to claim 12, characterized in that The remote terminal has established an RRC connection with the relay, including: The remote terminal has established an RRC connection with the relay, and the relay has established a Uu connection.

14. A cell evaluation method, characterized in that: include: In the case where the relay is already connected to the remote terminal, the relay performs evaluation of cell selection or reselection; In a case where the relay determines that a condition for cell selection or reselection is met, the relay performs cell selection or reselection; wherein, after performing the cell selection or reselection, the remote terminal is notified that the relay has performed the cell selection or reselection; or, the cell selection or reselection is performed after receiving a confirmation from the remote terminal; Wherein, when the remote terminal determines that the cell selection or reselection condition is met, the remote terminal continues to reside on the indirect link between the remote terminal and the relay; or When the remote terminal determines that a cell selection or reselection condition is met, the remote terminal performs cell selection or reselection, resides on the direct link, and performs at least one of the following: Notifying the relay that the remote terminal has performed cell selection or reselection; triggering the release of the unicast link between the remote terminal and the relay; In the case where the selected or reselected cell and the serving cell of the relay connection are in different tracking areas TA or radio access network notification areas RNA, triggering a corresponding tracking area update TAU or radio access network notification area update RNAU process; In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

15. The method according to claim 14, characterized in that After the step of the relay performing the evaluation of cell selection or reselection, the method further includes at least one of the following: The relay retains a unicast link between the relay and the remote terminal; The relay notifies the remote terminal of an identifier of the cell selected or reselected by the relay.

16. The method according to claim 14, characterized in that After the step of the relay performing the evaluation of cell selection or reselection, the method further comprises: The relay sends a request message to the remote terminal, wherein the request message is used to request the remote terminal to confirm whether to perform a cell selection or reselection process; When the relay determines that a cell selection or reselection condition is met, the relay performs cell selection or reselection, including: In a case where the relay determines that the conditions for cell selection or reselection are met and the remote terminal confirms to perform the cell selection or reselection process, the relay performs the cell selection or reselection.

17. A cell evaluation device, wherein a remote terminal comprises the device, characterized in that: include: A first execution module, configured to execute an evaluation of cell selection or reselection in a first state; Wherein, in the first state, the remote terminal has completed the selection or reselection of the relay, or, in the first state, the remote terminal has been connected to the relay; The device also includes: A first resident module is configured to continue to reside on the indirect link between the remote terminal and the relay when the remote terminal determines that a cell selection or reselection condition is met; or The second resident module is configured to, when the remote terminal determines that a cell selection or reselection condition is met, perform cell selection or reselection, reside on the direct link, and perform at least one of the following: Notifying the relay that the remote terminal has performed cell selection or reselection; triggering the release of the unicast link between the remote terminal and the relay; In the case where the selected or reselected cell and the serving cell of the relay connection are in different tracking areas TA or radio access network notification areas RNA, triggering a corresponding tracking area update TAU or radio access network notification area update RNAU process; In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

18. The device according to claim 17, characterized in that The performing of the evaluation of cell selection or reselection includes: The remote terminal performs a cell selection or reselection evaluation based on the direct link; or The remote terminal performs cell selection or reselection evaluation based on the indirect link; or The remote terminal performs evaluation of cell selection or reselection based on the direct link and the indirect link.

19. The device according to claim 18, characterized in that The remote terminal performs a cell selection or reselection evaluation based on the direct link, including: The remote terminal performs a cell selection or reselection evaluation based on first system information and a first measurement result, wherein the first system information is system information received by the remote terminal based on a direct link, and the first measurement result is a measurement result of the remote terminal based on the direct link measurement.

20. The device according to claim 19, characterized in that The remote terminal performs cell selection or reselection evaluation based on the first system information and the first measurement result, including: The remote terminal performs a cell selection or reselection evaluation based on the first system information and the first measurement result under a first condition, wherein the first condition includes at least one of the following: The remote terminal is within the coverage of the cell; The remote terminal can receive system information related to cell selection or reselection.

21. The device according to claim 18, characterized in that The remote terminal performs a cell selection or reselection evaluation based on the indirect link, including: The remote terminal performs a cell selection or reselection evaluation based on second system information and second measurement results, wherein the second system information is system information of the relay forwarding obtained by the remote terminal based on an indirect link, and the second measurement result is a measurement result of the relay measurement obtained by the remote terminal based on the indirect link.

22. The device according to claim 21, characterized in that The remote terminal performs cell selection or reselection evaluation based on the second system information and the second measurement result, including: The remote terminal performs cell selection or reselection evaluation based on the second system information and the second measurement result under the second condition, wherein the second condition includes at least one of the following: The remote terminal is outside the coverage of the cell; The remote terminal cannot receive system information related to cell selection or reselection based on the direct link.

23. The device according to claim 18, characterized in that The remote terminal performs evaluation of cell selection or reselection based on the direct link and the indirect link, including: The remote terminal performs a cell selection or reselection evaluation based on third system information and a third measurement result, wherein the third system information is system information of the relay forwarding obtained by the remote terminal based on an indirect link, and the third measurement result is a measurement result of the remote terminal based on a direct link measurement.

24. The device according to claim 23, characterized in that The remote terminal performs cell selection or reselection evaluation based on the third system information and the third measurement result, including: The remote terminal performs cell selection or reselection evaluation based on the third system information and the third measurement result under a third condition, wherein the third condition includes at least one of the following: The remote terminal is outside the coverage of the cell; The remote terminal cannot receive system information related to cell selection or reselection based on the direct link.

25. The device according to claim 18, 21 or 22, characterized in that The device also includes: The second execution module is configured to execute at least one of the following items when the remote terminal determines that a cell selection or reselection condition is met: Notifying the relay to select or reselect a cell; Sending to the relay a target cell identifier for the relay to select or reselect a cell; Reserving a unicast link between the remote terminal and the relay; In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

26. The device according to claim 18, 21 or 22, characterized in that The device also includes: The third execution module is configured to execute at least one of the following items when the remote terminal determines that the cell selection or reselection condition is met: Perform relay selection or reselection, wherein the serving cell of the selected or reselected relay is a target neighboring cell, wherein the target neighboring cell is a neighboring cell determined by performing cell selection or reselection; In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

27. The device according to any one of claims 17 to 23, characterized in that The device also includes: An evaluation module, configured for the remote terminal to perform relay selection or reselection evaluation in a second state and not perform cell selection or reselection evaluation, wherein the second state includes at least one of the following: The remote terminal is outside the coverage of the cell; The remote terminal cannot receive system information related to cell selection or reselection from the direct link.

28. The device according to any one of claims 17 to 23, characterized in that In the first state, the remote terminal has been connected to the relay, which includes at least one of the following: The remote terminal has established a radio resource control RRC connection with the relay; When the remote terminal is in an idle state or an inactive state, the remote terminal connects to the relay.

29. The device according to claim 28, characterized in that The remote terminal has established an RRC connection with the relay, including: The remote terminal has established an RRC connection with the relay, and the relay has established a Uu connection.

30. A cell evaluation device, a relay comprising the device, characterized in that: include: A first execution module, configured to execute evaluation of cell selection or reselection when the relay is already connected to the remote terminal; A second execution module, configured to execute cell selection or reselection if the relay determines that a cell selection or reselection condition is met; wherein, after performing the cell selection or reselection, the remote terminal is notified that the relay has performed the cell selection or reselection; or, the cell selection or reselection is performed after receiving a confirmation from the remote terminal; Wherein, when the remote terminal determines that the cell selection or reselection condition is met, the remote terminal continues to reside on the indirect link between the remote terminal and the relay; or When the remote terminal determines that a cell selection or reselection condition is met, the remote terminal performs cell selection or reselection, resides on the direct link, and performs at least one of the following: Notifying the relay that the remote terminal has performed cell selection or reselection; triggering the release of the unicast link between the remote terminal and the relay; In the case where the selected or reselected cell and the serving cell of the relay connection are in different tracking areas TA or radio access network notification areas RNA, triggering a corresponding tracking area update TAU or radio access network notification area update RNAU process; In the case that the selected or reselected cell does not belong to the TA or RNA of the remote terminal, a corresponding TAU or RNAU process is triggered.

31. The device according to claim 30, characterized in that The device further comprises at least one of the following: A reservation module, used for reserving a unicast link between the relay and the remote terminal; The notification module is used to notify the remote terminal of the identifier of the cell selected or reselected by the relay.

32. The device according to claim 30, characterized in that The device also includes: A sending module, used to send a request message to the remote terminal, wherein the request message is used to request the remote terminal to confirm whether to perform a cell selection or reselection process; The second execution module is used to execute cell selection or reselection when the relay determines that the cell selection or reselection condition is met and the remote terminal confirms to execute the cell selection or reselection process.

33. A terminal, the terminal being a remote terminal, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the cell evaluation method according to any one of claims 1 to 13.

34. A relay, characterized in that: The method comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the cell evaluation method according to any one of claims 14 to 16.

35. A readable storage medium, characterized in that: The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the cell evaluation method as described in any one of claims 1 to 13 are implemented, or when the program or instruction is executed by the processor, the steps of the cell evaluation method as described in any one of claims 14 to 16 are implemented.

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