Cell reselection method and device, terminal equipment, storage medium and program product

Abstract

The invention discloses a cell reselection method and device, terminal equipment, a storage medium and a program product, and the method comprises the steps that the terminal equipment selects M adjacent cells meeting a first condition from N adjacent cells, and selects one adjacent cell meeting a second condition from the M adjacent cells as a target cell; n is a positive integer, and M is a positive integer smaller than or equal to N; the terminal equipment carries out cell reselection on the target cell; wherein the first condition is that the difference value between the signal quality of the adjacent region and the first signal quality is smaller than or equal to a first threshold; the second condition is that the number of the beams which meet the third condition and are contained in the adjacent region is the maximum; the third condition is that the signal quality of the beam is greater than or equal to a second threshold; the number of the beams is counted according to the following mode: the beams forwarded by the same first device are counted as one beam.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a cell reselection method and apparatus, terminal equipment, storage medium, and program product. Background Technology

[0002] Communication between terminal devices and base stations can be relayed through reconfigurable intelligent surfaces (RIS). RIS is a novel type of intelligent passive surface that uses metamaterials to control the electromagnetic parameters of reflected electromagnetic waves, such as phase, frequency, and amplitude, thereby controlling the reflection angle of the incident wave and forming reflected beams in different directions.

[0003] Cell reselection decision conditions are related to beams. When the RIS (Radio Reselection System) is introduced into the wireless network, the RIS forms beams in different directions. If the current cell reselection decision conditions are still used, the target cell to be reselected will not be the optimal cell. Therefore, how to reasonably design cell reselection decision conditions needs to be addressed. Summary of the Invention

[0004] To address the aforementioned technical problems, embodiments of this application provide a cell reselection method and apparatus, a terminal device, a computer-readable storage medium, and a computer program product.

[0005] The cell reselection method provided in this application includes:

[0006] The terminal device selects M neighboring cells from N neighboring cells that meet the first condition, and selects one neighboring cell from the M neighboring cells that meets the second condition as the target cell; N is a positive integer, and M is a positive integer less than or equal to N;

[0007] The terminal device performs cell reselection to the target cell;

[0008] The first condition is: the difference between the signal quality of the neighboring cell and the first signal quality is less than or equal to a first threshold; the second condition is: the neighboring cell contains the most beams that meet the third condition; the third condition is: the signal quality of the beam is greater than or equal to a second threshold; the number of beams is counted as follows: beams forwarded through the same first device are counted as one beam.

[0009] The cell reselection device provided in this application embodiment is applied to a terminal device, and the device includes:

[0010] The selection unit is used to select M neighboring cells that satisfy a first condition from N neighboring cells, and to select one neighboring cell that satisfies a second condition from the M neighboring cells as the target cell; N is a positive integer, and M is a positive integer less than or equal to N;

[0011] A cell reselection unit is used to perform cell reselection to the target cell;

[0012] The first condition is: the difference between the signal quality of the neighboring cell and the first signal quality is less than or equal to a first threshold; the second condition is: the neighboring cell contains the most beams that meet the third condition; the third condition is: the signal quality of the beam is greater than or equal to a second threshold; the number of beams is counted as follows: beams forwarded through the same first device are counted as one beam.

[0013] The terminal device provided in this application includes a processor and a memory. The memory is used to store computer programs, and the processor is used to call and run the computer programs stored in the memory to execute any of the cell reselection methods described above.

[0014] The computer-readable storage medium provided in this application embodiment is used to store a computer program that causes a computer to execute any of the above-described cell reselection methods.

[0015] The computer program product provided in this application includes computer program instructions that cause a computer to execute any of the above-described cell reselection methods.

[0016] In the technical solution of this application embodiment, the cell reselection decision is enhanced, which can be better applied to the scenario where a first device (such as a reflector) is introduced into the wireless network. Specifically, in the cell reselection decision, beams forwarded by the same first device are counted as one beam. Based on this, the terminal device selects M neighboring cells that meet the first condition from N neighboring cells, and selects one neighboring cell that meets the second condition from the M neighboring cells as the target cell; N is a positive integer, and M is a positive integer less than or equal to N; the terminal device performs cell reselection to the target cell; wherein, the first condition is: the difference between the signal quality of the neighboring cell and the first signal quality is less than or equal to the first threshold; the second condition is: the neighboring cell contains the most beams that meet the third condition; the third condition is: the signal quality of the beam is greater than or equal to the second threshold. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating an application scenario of an embodiment of this application;

[0018] Figure 2 This is a schematic diagram of the RIS transport model;

[0019] Figure 3 This is a diagram illustrating the community re-election process;

[0020] Figure 4 This is a schematic diagram of cell reselection in a RIS scenario provided in the embodiments of this application. Figure 1 ;

[0021] Figure 5 This is a flowchart illustrating the cell reselection method provided in the embodiments of this application;

[0022] Figure 6 This is a schematic diagram of the scrambling encoding process provided in the embodiments of this application;

[0023] Figure 7 This is a schematic diagram of cell reselection in a RIS scenario provided in the embodiments of this application. Figure 2 ;

[0024] Figure 8 This is a schematic diagram of the structural composition of the cell reselection device provided in the embodiments of this application;

[0025] Figure 9 This is a schematic structural diagram of a communication device provided in an embodiment of this application;

[0026] Figure 10 This is a schematic structural diagram of the chip according to an embodiment of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] Figure 1 This is a schematic diagram of an application scenario according to an embodiment of this application.

[0029] like Figure 1 As shown, the communication system may include a terminal 110 and a network device 120. The network device 120 can communicate with the terminal 110 via an air interface. Multi-service transmission is supported between the terminal 110 and the network device 120.

[0030] It should be understood that the embodiments of this application are only illustrated by way of example using a communication system, but the embodiments of this application are not limited thereto. That is to say, the technical solutions of the embodiments of this application can be applied to various communication systems, such as 5G communication systems (also known as New Radio (NR) communication systems), or future communication systems, etc.

[0031] exist Figure 1 In the communication system shown, network device 120 can be an access network device that communicates with terminal 110. The access network device can provide communication coverage for a specific geographical area and can communicate with terminal 110 (e.g., UE) located within that coverage area.

[0032] Network equipment 120 can be a base station (gNB) in an NR system, or a network device in a future evolved Public Land Mobile Network (PLMN).

[0033] Terminal 110 can be any terminal. For example, terminal 110 can refer to an access terminal, user equipment (UE), user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device, etc.

[0034] Figure 1 An exemplary illustration shows a base station and two terminals. Optionally, the wireless communication system may include multiple base station devices and each base station may include other numbers of terminals within its coverage area. This application does not limit this aspect.

[0035] It should be noted that, Figure 1 This application merely illustrates the system to which this application applies; of course, the methods shown in the embodiments of this application can also be applied to other systems. Furthermore, the terms "system" and "network" are often used interchangeably herein. The term "and / or" in this application merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "or" relationship. It should also be understood that "instruction" mentioned in the embodiments of this application can be a direct instruction, an indirect instruction, or an indication of a related relationship. For example, A instructing B can mean that A directly instructs B, for example, B can be obtained through A; it can also mean that A indirectly instructs B, for example, A instructs C, B can be obtained through C; or it can mean that there is a related relationship between A and B. It should also be understood that "correspondence" mentioned in the embodiments of this application can indicate a direct or indirect correspondence between two things, or an related relationship between two things, or a relationship of instruction and being instructed, configuration and being configured, etc. It should also be understood that the "predefined" or "predefined rules" mentioned in the embodiments of this application can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminals and network devices), and this application does not limit the specific implementation method. For example, predefined can refer to those defined in a protocol. It should also be understood that in the embodiments of this application, the "protocol" can refer to standard protocols in the field of communication, such as the NR protocol and related protocols applied to future communication systems, and this application does not limit it.

[0036] To facilitate understanding of the technical solutions of the embodiments of this application, the relevant technologies of the embodiments of this application are described below. The following relevant technologies are optional solutions and can be combined with the technical solutions of the embodiments of this application in any way, and they all fall within the protection scope of the embodiments of this application.

[0037] 1. Intelligent Reflector: Also known as a Reconfigurable Intelligent Surface (RIS), it is a novel type of intelligent passive surface that utilizes metamaterials to control the electromagnetic parameters of reflected electromagnetic waves, such as phase, frequency, and amplitude, thereby controlling the reflection angle of the incident wave and forming reflected beams in different directions. Intelligent reflectors can relay signals without complex radio frequency circuits, offering advantages such as low cost, low power consumption, and ease of deployment. If there is an obstruction between the base station and the terminal equipment, the signal transmitted by the base station can be covered in blind spots by the intelligent reflector, such as... Figure 2 As shown.

[0038] The RIS (Radio Reflector Array) consists of a large-scale device array and an array control module (i.e., the RIS controller). The RIS controller receives, decodes, and executes RIS control signals sent by the base station and can report the basic configuration of the RIS to the base station. The base station adjusts the phase of the RIS based on channel state information. The corresponding adjustment commands can be transmitted via the wireless control link between the base station and the RIS. After the RIS controller adjusts the reflection parameters (phase or beam) of the RIS large-scale device array according to the adjustment commands, the RIS can reflect the base station's signal to the terminal equipment.

[0039] 2. Cell Reselection: Cell reselection is performed based on the priority of NR frequencies, and terminal devices will tend to reselect cells on higher priority frequencies. For example... Figure 3 As shown, the terminal device performs cell reselection in the following main steps:

[0040] (1) Obtain priority

[0041] Specifically, the terminal device obtains priority information of the serving cell and inter-frequency / inter-system neighboring cells through system messages.

[0042] (2) Start measurement

[0043] The terminal device determines whether to initiate measurement based on certain conditions. If the conditions are not met, the terminal device will not measure neighboring cells and will continue to camp on the current serving cell. The conditions for initiating measurement are:

[0044] The start-up measurement conditions for co-frequency neighboring cells are: S rxlev ≤S intraSearchP S rxlev To serve the signal strength of the cell, S intraSearchP For same-frequency measurement threshold;

[0045] The start-up measurement conditions for inter-frequency or inter-system neighboring cells are (for frequencies of the same or lower priority): S rxlev ≤S nonintraSearchp S rxlev To serve the signal strength of the cell, S nonintraSearchp For non-co-frequency measurement thresholds;

[0046] If a neighboring cell of a different frequency has a higher priority than the current serving cell, the terminal device will continue to measure the neighboring cell of that different frequency regardless of the signal quality of the serving cell.

[0047] (3) Community re-election decision

[0048] If the conditions for initiating measurement are met, the terminal device initiates the measurement and makes a reselection decision based on the measurement results.

[0049] The R-value of the serving cell is calculated using the following formula: R s =Q meas,s +Q hyst -Qoffset temp R s The R value of the service cell, Q meas,s Qoffset is determined based on the Reference Signal Receiving Power (RSRP) of the serving cell. temp The hysteresis is Qoffset. temp This is a temporary offset;

[0050] The R value of a neighboring cell is calculated using the following formula: R n =Q meas,n -Qoffset-Qoffset temp R n R value of the neighboring cell, Q meas,n Determined based on the RSRP of neighboring cells, Qoffset is the offset of the neighboring cells. temp This is a temporary offset.

[0051] The reselection criteria for co-frequency neighboring cells or co-priority inter-frequency neighboring cells are: R n Greater than R s In other words, the target cell for reselection is the neighboring cell with the largest R value (the neighboring cell with the largest R value is generally the neighboring cell with the strongest RSRP); and the RSRP of the neighboring cell is greater than the RSRP of the serving cell by a certain threshold, and this condition persists for a period of time.

[0052] Once the above reselection condition is met, the terminal device will perform a reselection to the target cell.

[0053] 3. Cell reselection for multi-beam co-frequency neighboring cells or co-priority inter-frequency neighboring cells:

[0054] 5G supports multiple beams within a single cell, requiring optimization of cell reselection conditions based on the cell's beam configuration. Specifically, among co-frequency or hetero-frequency neighboring cells with the same priority that meet the cell selection rules, the terminal device identifies neighboring cells whose signal quality meets the following conditions:

[0055] RSRP highest ranked cell -RSRP n ≤rangeToBestCell (1);

[0056] Among them, RSRP highest ranked cell RSRP is the RSRP value of the cell with the highest R value; RSRP n This is the RSRP value of a neighboring cell. `rangeToBestCell` is the range parameter, indicated in the SIB2 message, and is fixed at 3dB.

[0057] Among the neighboring cells that meet the conditions shown in the above formula (1), the terminal device selects the cell with the largest number of beam-level RSRP values ​​that are greater than or equal to the threshold absthreshSS-consolidation (beam quality threshold) as the best cell. The best cell is also the target cell for cell reselection.

[0058] For example, the range parameter `rangeToBestCell` is 3dB, and the beam quality threshold `absthreshSS-consolidation` is -86dBm. There are four cells: A, B, C, and D. The RSRP values ​​for each cell are shown in Table 1 below. highest ranked cell Given the RSRP value of cell A (i.e., -80dBm), the neighboring cells that satisfy the conditions shown in formula (1) above are cell A, cell B, and cell C. Among these three cells, cell B has two beams with RSRP values ​​greater than -86dBm, and cell C has one beam with RSRP values ​​greater than -86dBm. Therefore, the terminal device selects cell B as the optimal cell, which is also the target cell for cell reselection.

[0059]

[0060] Table 1

[0061] When a Resonant Array (RIS) is introduced into a wireless network, the RIS's multi-beam design can affect cell reselection decisions, leading to the following situations: Figure 4As shown, the serving cell of the terminal device is cell A. After the terminal device starts neighbor cell measurement, referring to Table 2 below, cell B has two beams greater than -86dBm, and RIS-assisted cell C has three beams greater than -86dBm. Therefore, based on the above cell reselection decision conditions, the terminal device selects cell C as the optimal cell. However, since the direct link of cell C is blocked, selecting cell B is actually a better choice, as cell B has better signal quality.

[0062]

[0063] Table 2

[0064] In cell reselection among multi-beam co-frequency neighboring cells or co-priority inter-frequency neighboring cells, among neighboring cells with similar RSRP values ​​(e.g., 3dB), the terminal device selects the cell with the most beams that meet the beam quality threshold as the optimal cell 1. However, since the RIS has a large number of beams, this large number of beams can affect the terminal device's cell reselection decision. For example, when the RIS has a large number of elements, its reflected beam is narrower. Comparing the number of narrow RIS beams with the base station beams simultaneously, the same number of beams can result in different coverage areas, thus affecting the terminal device's cell reselection decision.

[0065] Therefore, when RIS is introduced into a wireless network, it is necessary to design reasonable cell reselection decision conditions. To this end, the following technical solutions based on embodiments of this application are proposed.

[0066] To facilitate understanding of the technical solutions of the embodiments of this application, the technical solutions of this application are described in detail below through specific embodiments. The above-mentioned related technologies are optional solutions and can be arbitrarily combined with the technical solutions of the embodiments of this application, all of which fall within the protection scope of the embodiments of this application. The embodiments of this application include at least some of the following contents.

[0067] It should be noted that the first device described in the embodiments of this application can also be described as a smart reflective surface, a smart metasurface, a RIS, or a reflective surface, etc. The first device is used to forward uplink and / or downlink signals between the base station and the terminal device. More details about the first device can be found in the foregoing descriptions of smart reflective surfaces / smart metasurfaces / RIS.

[0068] It should be noted that the neighboring cells described in this application embodiment include co-frequency neighboring cells and / or co-priority inter-frequency neighboring cells. Co-frequency neighboring cells refer to neighboring cells that share the same frequency as the current serving cell. Inter-priority inter-frequency neighboring cells refer to neighboring cells that share the same frequency as the current serving cell but have the same priority.

[0069] It should be noted that the signal quality of the cell / beam described in the embodiments of this application can be represented or determined by the RSRP value.

[0070] Figure 5 This is a flowchart illustrating the cell reselection method provided in the embodiments of this application, as shown below. Figure 5 As shown, the cell reselection method includes:

[0071] Step 501: The terminal device selects M neighboring cells from N neighboring cells that meet the first condition, and selects one neighboring cell from the M neighboring cells that meets the second condition as the target cell; N is a positive integer, and M is a positive integer less than or equal to N; wherein, the first condition is: the difference between the signal quality of the neighboring cell and the first signal quality is less than or equal to the first threshold; the second condition is: the neighboring cell contains the most beams that meet the third condition; the third condition is: the signal quality of the beam is greater than or equal to the second threshold; the number of beams is counted as follows: beams forwarded by the same first device are counted as one beam.

[0072] In this embodiment, N neighboring cells satisfy the cell selection rule; in other words, N neighboring cells are neighboring cells that satisfy the cell selection rule. Here, the cell selection rule can also be called the S criterion, which is that the RSRP value of the neighboring cell is greater than or equal to the minimum access power. It should be noted that neighboring cells that satisfy the cell selection rule can also be understood as neighboring cells that satisfy the minimum access requirements.

[0073] In this embodiment of the application, the cell reselection decision conditions (or cell reselection decision criteria) include:

[0074] (1) Select M neighboring cells from N neighboring cells that meet the first condition. The first condition is: the difference between the signal quality of the neighboring cell and the first signal quality is less than or equal to the first threshold.

[0075] For example, among neighboring cells that satisfy the cell selection rule (i.e., the S criterion), the terminal device selects a neighboring cell whose signal quality meets the following condition (i.e., the first condition): RSRP highest ranked cell -RSRP n ≤rangeToBestCell. Where RSRP highest ranked cell For first-order signal quality; RSRP n The signal quality of the nth neighboring cell out of N neighboring cells, 1≤n≤N; rangeToBestCell is the first threshold, which can also be called the range parameter.

[0076] In some implementations, the first signal quality is the signal quality of the neighboring cell with the highest R value or the highest RSRP among N neighboring cells. Here, the R value of the neighboring cell can be determined by the following formula: R n =Q meas,n-Qoffset-Qoffset temp R n R value of the neighboring cell, Q meas,n Determined based on the RSRP of neighboring cells, Qoffset is the offset of the neighboring cells. temp This is a temporary offset.

[0077] In some implementations, the first threshold is indicated via a system broadcast message, such as via SIB1. As an example, the first threshold is 3dB.

[0078] (2) Select one neighboring cell from the above M neighboring cells that meets the second condition as the target cell. The second condition is: the neighboring cell contains the most beams that meet the third condition; the third condition is: the signal quality of the beam is greater than or equal to the second threshold; the number of beams is counted as follows: beams forwarded through the same first device are counted as one beam.

[0079] For example, among M neighboring cells that satisfy the first condition, the terminal device selects a neighboring cell that satisfies the following condition (i.e., the second condition): the signal quality of the beams in the cell is greater than or equal to a second threshold, and the number of beams greater than or equal to the second threshold is the largest. The finally selected neighboring cell is the optimal cell, which is also the target cell for cell reselection. Here, the second threshold can also be called the beam quality threshold (or absthreshSS-consolidation). The number of beams is counted as follows: beams forwarded by the same first device are counted as one beam.

[0080] In an application instance, such as Figure 4 As shown, the serving cell of the terminal device is cell A. After the terminal device starts neighbor cell measurement, referring to Table 3 below, the neighbor cells that meet the first condition are cell B and cell C. Among them, cell B has two beams greater than -86dBm (i.e., the second threshold), and cell C, which is assisted by a reflector, has three beams greater than -86dBm. However, these three beams of cell C are all forwarded through the same reflector. During cell reselection decision, these three beams are counted as one beam. Therefore, the terminal device selects cell B as the optimal cell, that is, the target cell for cell reselection.

[0081]

[0082] Table 3

[0083] In this embodiment of the application, in order to identify which beams are forwarded by the first device and / or which beams are forwarded by the same first device, the terminal device needs to associate the beams forwarded by the same first device with the same information. The terminal device can then identify which beams are forwarded by the same first device using this information.

[0084] There is a correspondence between beams and synchronization signal blocks (SS / PBCH, SSB), or in other words, different SSBs are transmitted through different beams. Among them, the SSB includes the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and the physical broadcast channel (PBCH).

[0085] It should be noted that the "first device forwarding beam" described in the embodiments of this application can also be described as "the SSB corresponding to the first device forwarding beam" or "the first device forwarding SSB".

[0086] In some implementations, the terminal device receives an SSB, which carries first information and / or second information. The first information is used to indicate that the beam corresponding to the SSB is forwarded through a first device, and the second information is used to indicate the first device that forwards the beam corresponding to the SSB. The terminal device determines the first device that forwards the beam corresponding to the SSB based on the first information and / or the second information.

[0087] In one implementation, the first and / or second information is carried in the PBCH of the SSB. In another implementation, the first and / or second information is carried in the Master Information Block (MIB) of the PBCH; or, the first and / or second information is carried in the payload of the PBCH.

[0088] In one application example, as shown in Table 4 below, the idle bits in the MIB are used to configure the SSB-RIS identifier, and the SSB-RIS identifier indicates that the beam corresponding to the SSB where the MIB is located is forwarded through the RIS.

[0089]

[0090] Table 4

[0091] In one application example, the 8-bit PBCH message body indicates that the beam corresponding to the SSB is forwarded through the RIS, and / or indicates which RIS the beam corresponding to the SSB is forwarded through.

[0092] In the above scheme, the first information and / or the second information carried in the PBCH are used to indicate the beam corresponding to the SSB to be forwarded by the first device and / or the first device that forwards the beam corresponding to the SSB. This indication method is easy to implement and has low complexity.

[0093] In some implementations, the terminal device receives an SSB, which is scrambled with third information related to a first device that forwards the beam corresponding to the SSB; the terminal device determines the first device of the beam corresponding to the SSB based on the third information.

[0094] Here, the SSB forwarded through the first device can be scrambled using information related to the first device (i.e., third information) to implicitly indicate which first device the SSB originates from. For example... Figure 6 As shown, Figure 6 The SSB scrambling and coding process is described, which includes the following steps: payload generation, scrambling, Cyclic Redundancy Check (CRC) attachment, channel coding, and rate matching. In the scrambling step, information related to the first device (i.e., the third information) can be used to scramble the SSB forwarded by that first device. After receiving the SSB, the terminal device descrambles it and performs a correct CRC check. Then, it can obtain the information related to the first device (i.e., the third information) and determine which first device the SSB was forwarded through based on this information.

[0095] In some implementations, the third information may be the beam information of the first device corresponding to the base station, such as the SSB index. The SSBs corresponding to beams forwarded by the same first device are all scrambled using the SSB index corresponding to that first device. For example, beams 1, 2, and 3 forwarded by reflector 1 are scrambled using SSB index #1, while beams 4, 5, and 6 forwarded by reflector 2 are scrambled using SSB index #2.

[0096] In some implementations, the third information may be the identifier of the first device, such as a RIS identifier. SSBs corresponding to beams forwarded by the same first device are all scrambled using the identifier of that first device. For example, beams 1, 2, and 3 forwarded by reflector 1 are scrambled using RIS identifier #1, while beams 4, 5, and 6 forwarded by reflector 2 are scrambled using RIS identifier #2.

[0097] In an application instance, such as Figure 7As shown, two RISs are deployed on base station A, namely RIS1 and RIS2. RIS1 corresponds to beam 3 of the base station. The SSBs forwarded by RIS1 are scrambled using beam index #3. Here, the SSBs forwarded by RIS1 include the SSBs corresponding to beams 4, 5, and 6. Similarly, RIS2 corresponds to beam 2 of the base station. The SSBs forwarded by RIS2 are scrambled using beam index #2. Here, the SSBs forwarded by RIS2 include the SSBs corresponding to beams 7, 8, and 9. The terminal device descrambles the SSBs forwarded by RIS1 to obtain beam index #3, and thus determines that beams 4, 5, and 6 are forwarded through the same RIS1. Similarly, the terminal device descrambles the SSBs forwarded by RIS2 to obtain beam index #2, and thus determines that beams 7, 8, and 9 are forwarded through the same RIS2.

[0098] In the above scheme, the SSB forwarded by the first device is scrambled using information related to the first device (i.e., third information) to implicitly indicate which first device the SSB comes from. This indication method can distinguish which beams come from which first device in a scenario with multiple first devices.

[0099] Step 502: The terminal device performs cell reselection to the target cell.

[0100] Here, after the terminal device performs cell reselection with the target cell, the terminal device camps on the target cell, and the target cell becomes the serving cell of the terminal device.

[0101] The technical solution implemented in this application proposes a cell reselection method that solves the problem that the multiple beams of the first device can affect the inaccuracy of cell reselection after the introduction of a wireless network. Specifically, the cell reselection decision is enhanced to better suit the scenario where the first device is introduced into the wireless network. In the cell reselection decision, beams forwarded by the same first device are counted as one beam. Based on this, the terminal device selects M neighboring cells from N neighboring cells that meet the first condition, and selects one neighboring cell from the M neighboring cells that meets the second condition as the target cell; N is a positive integer, and M is a positive integer less than or equal to N; the terminal device performs cell reselection on the target cell; wherein, the first condition is: the difference between the signal quality of the neighboring cell and the first signal quality is less than or equal to a first threshold; the second condition is: the neighboring cell contains the most beams that meet the third condition; the third condition is: the signal quality of the beam is greater than or equal to the second threshold.

[0102] Figure 8This is a schematic diagram of the structural composition of the cell reselection device provided in the embodiments of this application, which is applied to terminal equipment, such as... Figure 8 As shown, the cell reselection device includes:

[0103] Selection unit 801 is used to select M neighboring cells that satisfy a first condition from N neighboring cells, and select one neighboring cell that satisfies a second condition from the M neighboring cells as the target cell; N is a positive integer, and M is a positive integer less than or equal to N;

[0104] The cell reselection unit 802 is used to perform cell reselection to the target cell;

[0105] The first condition is: the difference between the signal quality of the neighboring cell and the first signal quality is less than or equal to a first threshold; the second condition is: the neighboring cell contains the most beams that meet the third condition; the third condition is: the signal quality of the beam is greater than or equal to a second threshold; the number of beams is counted as follows: beams forwarded through the same first device are counted as one beam.

[0106] In some embodiments, the apparatus further includes: a receiving unit 803, configured to receive an SSB, the SSB carrying first information and / or second information, the first information being used to indicate that the beam corresponding to the SSB is forwarded through a first device, and the second information being used to indicate the first device that forwards the beam corresponding to the SSB; and a determining unit 804, configured to determine the first device corresponding to the beam of the SSB based on the first information and / or the second information.

[0107] In some implementations, the first information and / or the second information are carried in the PBCH of the SSB.

[0108] In some implementations, the first information and / or the second information are carried in the MIB of the PBCH; or, the first information and / or the second information are carried in the message body of the PBCH.

[0109] In some embodiments, the apparatus further includes: a receiving unit 803 for receiving an SSB scrambled by third information, the third information being related to a first device that forwards the beam corresponding to the SSB; and a determining unit 804 for determining a first device that forwards the beam corresponding to the SSB based on the third information.

[0110] In some implementations, the first signal quality is the signal quality of the neighboring cell with the highest R value or the highest RSRP among the N neighboring cells.

[0111] In some implementations, the N neighboring cells satisfy the cell selection rules.

[0112] Those skilled in the art should understand that Figure 8 The functions of each unit in the cell reselection device shown can be understood by referring to the relevant descriptions of the aforementioned method. Figure 8 The functions of each unit in the cell reselection device shown can be implemented by a program running on a processor or by specific logic circuits.

[0113] Figure 9 This is a schematic structural diagram of a communication device 900 provided in an embodiment of this application. This communication device may be a terminal device. Figure 9 The communication device 900 shown includes a processor 910, which can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0114] Optionally, such as Figure 9 As shown, the communication device 900 may further include a memory 920. The processor 910 can retrieve and run computer programs from the memory 920 to implement the methods described in this embodiment.

[0115] The memory 920 can be a separate device independent of the processor 910, or it can be integrated into the processor 910.

[0116] Optionally, such as Figure 9 As shown, the communication device 900 may also include a transceiver 930, which the processor 910 can control to communicate with other devices. Specifically, it can send information or data to other devices or receive information or data sent by other devices.

[0117] The transceiver 930 may include a transmitter and a receiver. The transceiver 930 may further include antennas, and the number of antennas may be one or more.

[0118] The communication device 900 may specifically be a terminal device in the embodiments of this application, and the communication device 900 may implement the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0119] Figure 10 This is a schematic structural diagram of the chip according to an embodiment of this application. Figure 10 The chip 1000 shown includes a processor 1010, which can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0120] Optionally, such as Figure 10 As shown, chip 1000 may further include memory 1020. Processor 1010 can retrieve and run computer programs from memory 1020 to implement the methods described in this embodiment.

[0121] The memory 1020 can be a separate device independent of the processor 1010, or it can be integrated into the processor 1010.

[0122] Optionally, the chip 1000 may also include an input interface 1030. The processor 1010 can control the input interface 1030 to communicate with other devices or chips, specifically, to acquire information or data sent by other devices or chips.

[0123] Optionally, the chip 1000 may also include an output interface 1040. The processor 1010 can control the output interface 1040 to communicate with other devices or chips, specifically, to output information or data to other devices or chips.

[0124] This chip can be applied to the terminal device in the embodiments of this application, and the chip can implement the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0125] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0126] It should be understood that the processor in the embodiments of this application may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor described above can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0127] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0128] It should be understood that the above-described memory is exemplary and not a limiting description. For example, the memory in the embodiments of this application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DR RAM), etc. That is to say, the memory in the embodiments of this application is intended to include, but is not limited to, these and any other suitable types of memory.

[0129] This application also provides a computer-readable storage medium for storing a computer program. This computer-readable storage medium can be applied to the terminal device in the embodiments of this application, and the computer program causes the computer to execute the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application; for brevity, further details are omitted here.

[0130] This application also provides a computer program product, including computer program instructions. This computer program product can be applied to the terminal device in this application embodiment, and the computer program instructions cause the computer to execute the corresponding processes implemented by the terminal device in the various methods of this application embodiment; for simplicity, further details are omitted here.

[0131] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0132] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0133] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0134] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0135] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0136] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0137] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cell reselection method, characterized in that, The method includes: The terminal device selects M neighboring cells from N neighboring cells that meet the first condition, and selects one neighboring cell from the M neighboring cells that meets the second condition as the target cell; N is a positive integer, and M is a positive integer less than or equal to N; The terminal device performs cell reselection to the target cell; The first condition is: the difference between the signal quality of the neighboring cell and the first signal quality is less than or equal to a first threshold; the second condition is: the neighboring cell contains the most beams that meet the third condition; the third condition is: the signal quality of the beam is greater than or equal to a second threshold; the number of beams is counted as follows: beams forwarded through the same first device are counted as one beam.

2. The method according to claim 1, characterized in that, The method further includes: The terminal device receives a synchronization signal block (SSB), the SSB carrying first information and / or second information, the first information being used to indicate that the beam corresponding to the SSB is forwarded by the first device, and the second information being used to indicate the first device that forwards the beam corresponding to the SSB; The terminal device determines the first device that corresponds to the beam of the SSB based on the first information and / or the second information.

3. The method according to claim 2, characterized in that, The first information and / or the second information are carried in the physical broadcast channel PBCH of the SSB.

4. The method according to claim 3, characterized in that, The first information and / or the second information are carried in the main information block (MIB) of the PBCH; or, The first information and / or the second information are carried in the message body of the PBCH.

5. The method according to claim 1, characterized in that, The method further includes: The terminal device receives an SSB, which is scrambled by a third information, which is related to the first device that forwards the beam corresponding to the SSB. The terminal device determines the first device of the beam corresponding to the SSB based on the third information.

6. The method according to any one of claims 1 to 5, characterized in that, The first signal quality is the signal quality of the neighboring cell with the highest R value or the highest reference signal received power RSRP among the N neighboring cells.

7. The method according to any one of claims 1 to 5, characterized in that, The N neighboring cells satisfy the cell selection rules.

8. A cell reselection device, characterized in that, Applied to a terminal device, the device includes: The selection unit is used to select M neighboring cells that satisfy a first condition from N neighboring cells, and to select one neighboring cell that satisfies a second condition from the M neighboring cells as the target cell; N is a positive integer, and M is a positive integer less than or equal to N; A cell reselection unit is used to perform cell reselection to the target cell; The first condition is: the difference between the signal quality of the neighboring cell and the first signal quality is less than or equal to a first threshold; the second condition is: the neighboring cell contains the most beams that meet the third condition; the third condition is: the signal quality of the beam is greater than or equal to a second threshold; the number of beams is counted as follows: beams forwarded through the same first device are counted as one beam.

9. A terminal device, characterized in that, include: A processor and a memory for storing a computer program, the processor for calling and running the computer program stored in the memory to perform the method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, Used to store a computer program that causes a computer to perform the method as described in any one of claims 1 to 7.

11. A computer program product, characterized in that, It includes computer program instructions that cause a computer to perform the method as described in any one of claims 1 to 7.

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