Communication method and communication apparatus

Abstract

The present application relates to the technical field of communications, and provides a communication method and a communication apparatus. The reduction of invalid signaling interaction between a terminal device and a network device is facilitated, thereby helping to reduce the power consumption of the terminal device and the network device. The method comprises: receiving first information from a first cell, the first information being used for configuring a resource for sending second information, and the second information being used for requesting a system message of a second cell; and sending the second information to the second cell or the first cell, the second cell being a cell selected on the basis of a first condition, and the first condition being related to reference signal received power and / or reference signal received quality.

Description

Communication method and communication device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on April 3, 2024, with application number 202410406145.5 and application name “Communication Method and Communication Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a communication method and a communication device. Background Art

[0003] Currently, terminal devices can camp on cells that meet the S criterion. Therefore, terminal devices in idle or inactive mode can select a cell to camp on based on the cell selection parameters included in the system messages broadcast by each cell. Typically, each cell broadcasts system messages periodically. However, for network energy-saving cells, system messages need to be broadcast based on terminal device requests. For example, a terminal device sends a wake-up signal to the network energy-saving cell; in response to the wake-up signal, the network energy-saving cell broadcasts a system message.

[0004] However, after the terminal device requests the system information of the cell, it may still be unable to reside in the cell, resulting in invalid signaling interaction between the terminal device and the network device, causing high power consumption of the terminal device and the network device. Summary of the Invention

[0005] The embodiments of the present application provide a communication method and a communication device, which help reduce invalid signaling interactions between terminal devices and network devices, thereby helping to reduce power consumption of terminal devices and network devices.

[0006] In a first aspect, a communication method is provided, comprising: receiving first information from a first cell, the first information being used to configure resources for sending second information, and the second information being used to request a system message from the second cell; and sending second information to the second cell or the first cell, the second cell being a cell selected based on a first condition, the first condition being related to a reference signal reception power and / or a reference signal reception quality.

[0007] In a possible implementation, the method may be executed by a terminal device or a chip in the terminal device.

[0008] In the communication method of the present application, before the terminal device sends information for requesting the second cell's system message, the terminal device can first determine the possibility that the second cell meets the S criterion based on the measured RSRP and / or RSRQ. In this way, the terminal device can request the second cell's system message when it is determined that the second cell is likely to meet the S criterion, thereby increasing the success rate of the terminal device residing in the second cell based on the second cell's system message. This can reduce ineffective signaling interactions between the terminal device and the network device, help reduce signaling overhead, and reduce the power consumption of the terminal device and the network device.

[0009] In combination with the first aspect, in certain implementations of the first aspect, the first condition includes: selecting the second cell according to the reference signal reception power ranking and / or the reference signal reception quality ranking; and / or, the difference between the reference signal reception power and the first parameter is greater than or equal to 0 and / or the difference between the reference signal reception quality and the second parameter is greater than or equal to 0.

[0010] In this way, the terminal device can determine the RSRP sorting and / or RSRQ sorting by the terminal device itself, and then the terminal device can determine the selected second cell through the RSRP sorting and / or RSRQ sorting, and determine whether the second cell meets the first condition, so that the signaling overhead is smaller and the power consumption of the network device is smaller; or, RSRP minus the first parameter is greater than or equal to 0, indicating that the strength of the received signal in the second cell is greater; RSRQ minus the second parameter is greater than or equal to 0, indicating that the quality of the received signal in the second cell is better, indicating that the possibility of the second cell meeting the S criterion is greater, that is, the success rate of the terminal device successfully residing in the second cell is higher.

[0011] In combination with the first aspect, in certain implementations of the first aspect, the first parameter includes a first preset threshold, or the first parameter includes one or more of the following: a minimum value of a cell signal reception level value, a first offset value, a first power, or a second offset value; wherein the first offset value is an offset value of a cell signal reception level value when switching from an accessed public land mobile network to a public land mobile network with a higher priority, and the second offset value is an offset value of a cell signal reception level value for selecting a second cell within a first time period when establishing a connection with the second cell fails.

[0012] In this way, when it is determined that the RSRP of the terminal device is greater than or equal to the first preset threshold, it means that the RSRP of the second cell is larger, and the second cell is more likely to meet the S criterion, that is, the terminal device has a higher success rate in successfully residing in the second cell. In the case where the first parameter includes one or more of the above items, since the cell selection parameter is related to the S criterion, therefore, when the RSRP minus the first parameter is greater than or equal to 0, it means that the second cell is more likely to meet the S criterion, that is, the terminal device has a higher success rate in residing in the second cell.

[0013] In combination with the first aspect, in certain implementations of the first aspect, the second parameter includes a second preset threshold, or the second parameter includes one or more of the following: a minimum value of the cell signal reception quality value, a third offset value, or a fourth offset value; wherein the third offset value is an offset value of the cell signal reception quality value when switching from an accessed public land mobile network to a public land mobile network with a higher priority, and the fourth offset value is an offset value of the cell signal reception quality value of the second cell selected within the second time period when establishing a connection with the second cell fails.

[0014] In this way, when it is determined that the RSRQ of the terminal device is greater than or equal to the second preset threshold, it means that the RSRQ of the second cell is larger, and the second cell is more likely to meet the S criterion, that is, the terminal device has a higher success rate in successfully residing in the second cell. In the case where the second parameter includes one or more of the above items, since the cell selection parameter is related to the S criterion, when the RSRQ minus the second parameter is greater than or equal to 0, it means that the second cell is more likely to meet the S criterion, that is, the terminal device has a higher success rate in residing in the second cell.

[0015] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: receiving third information and fourth information from the first cell, the third information being used to indicate the first cell list, the fourth information being used to indicate the first parameters and / or second parameters of all or part of the cells in the first cell list, and the second cell belonging to all or part of the cells.

[0016] In this way, the terminal device can obtain the first parameters and / or second parameters of all or part of the cells included in the first cell list from the first cell, and determine the second cell that meets the first condition from all or part of the cells, so that a request for the system message of the second cell can be sent to the second cell.

[0017] In combination with the first aspect, in certain implementations of the first aspect, the third information and the fourth information are carried in the same system message.

[0018] In this way, the terminal device can obtain the third information and the fourth information from the same system message, so that the terminal device can obtain the third information and the fourth information more efficiently.

[0019] With reference to the first aspect, in certain implementations of the first aspect, the third information is carried in the first system message, and the fourth information is carried in the second system message.

[0020] The first system message and the second system message are messages of different systems. In this way, a system message of the first cell will not carry too much information.

[0021] In combination with the first aspect, in certain implementations of the first aspect, the method further includes: receiving third information from the first cell; sending fifth information to the first cell, the fifth information being used to request fourth information or a second system message; and receiving fourth information from the first cell.

[0022] In this way, the first cell can send information indicating the first parameters and / or second parameters of all or part of the cells in the first cell list to the terminal device based on the indication of the fifth information.

[0023] In combination with the first aspect, in certain implementations of the first aspect, the fifth information is carried in a random access request or a radio resource control RRC request message, and the fifth information includes information for indicating a second system message and / or information for indicating all or part of the cells.

[0024] In this way, the information that the terminal device needs to obtain can be indicated to the first cell through the random access process.

[0025] In combination with the first aspect, in certain implementations of the first aspect, the information used to indicate all or part of the cells satisfies the following conditions: when the fifth information is carried in a random access request, the information used to indicate all or part of the cells includes any one of the following: a bit map, a cell identifier of each cell in all or part of the cells, or at least one preamble sequence; or, when the fifth information is carried in an RRC request message, the information used to indicate all or part of the cells includes a bit map or a cell identifier of each cell in all or part of the cells.

[0026] In this way, the first cell can determine all or part of the cells. In the case where the fifth information is carried in the RRC request message, since the RRC request message does not carry a preamble sequence, the fifth information does not include at least one preamble sequence.

[0027] In combination with the first aspect, in certain implementations of the first aspect, the fifth information includes information for indicating all or part of the cells; sending the fifth information to the first cell includes: sending a random access request to the first cell, the random access request being used to request a second system message; receiving a random access response from the first cell; and sending an RRC request message to the first cell based on the random access response, the RRC request message including the fifth information.

[0028] In this way, the terminal device can indicate through message 1 and message 3 during the random access process that the first cell needs to send the first parameters and / or second parameters of all or part of the cells through the second system message.

[0029] In combination with the first aspect, in some implementations of the first aspect, the method further includes: receiving a system message from the first cell or from the second cell.

[0030] In this way, when the first cell and the second cell are not the same cell, the terminal device can obtain the system information of the second cell from the first cell or the second cell.

[0031] In combination with the first aspect, in certain implementations of the first aspect, the first cell and the second cell are the same cell; and the method further includes: receiving a system message from the second cell.

[0032] In this way, when the first cell and the second cell are the same cell, the terminal device can obtain the system information of the second cell from the second cell.

[0033] In combination with the first aspect, in some implementations of the first aspect, the method further includes: receiving information from the first cell indicating a public land mobile network of the second cell.

[0034] In this way, when the terminal device switches from the VPLMN to the PLMN corresponding to the second cell with a higher priority, the terminal device can determine the PLMN of the second cell.

[0035] According to a second aspect, another communication method is provided, including: sending first information to a terminal device, the first information being used to configure resources for sending second information, and the second information being used to request a system message of a second cell; receiving second information from the terminal device, the second cell being a cell selected based on a first condition, and the first condition being related to a reference signal reception power and / or a reference signal reception quality.

[0036] In a possible implementation, the method may be executed by a network device corresponding to the first cell or the second cell, or by a chip in the network device.

[0037] In combination with the second aspect, in certain implementations of the second aspect, the first condition includes: selecting the second cell according to the reference signal reception power ranking and / or the reference signal reception quality ranking; and / or, the difference between the reference signal reception power and the first parameter is greater than or equal to 0 and / or the difference between the reference signal reception quality and the second parameter is greater than or equal to 0.

[0038] In combination with the second aspect, in certain implementations of the second aspect, the first parameter includes a first preset threshold, or the first parameter includes one or more of the following: a minimum value of a cell signal reception level value, a first offset value, a first power, or a second offset value; wherein the first offset value is an offset value of a cell signal reception level value when switching from a VPLMN to a PLMN with a higher priority, and the second offset value is an offset value of a cell signal reception level value for selecting a second cell within a first time period when establishing a connection with the second cell fails.

[0039] In combination with the second aspect, in certain implementations of the second aspect, the second parameter includes a second preset threshold, or the second parameter includes one or more of the following: a minimum value of the cell signal reception quality value, a third offset value, or a fourth offset value; wherein the third offset value is an offset value of the cell signal reception quality value when switching from an accessed public land mobile network to a public land mobile network with a higher priority, and the fourth offset value is an offset value of the cell signal reception quality value of the second cell selected within the second time period when establishing a connection with the second cell fails.

[0040] In combination with the second aspect, in certain implementations of the second aspect, the method also includes: sending third information and fourth information to the terminal device, the third information is used to indicate the first cell list, the fourth information is used to indicate the first parameters and / or second parameters of all or part of the cells in the first cell list, and the second cell belongs to all or part of the cells.

[0041] In combination with the second aspect, in certain implementations of the second aspect, the third information and the fourth information are carried in the same system message.

[0042] With reference to the second aspect, in certain implementations of the second aspect, the third information is carried in the first system message, and the fourth information is carried in the second system message.

[0043] In combination with the second aspect, in certain implementations of the second aspect, the method further includes: sending third information to the terminal device; receiving fifth information from the terminal device, the fifth information being used to request fourth information or a second system message; and sending fourth information to the terminal device.

[0044] In combination with the second aspect, in certain implementations of the second aspect, the fifth information satisfies any of the following: the fifth information is carried in a random access request or a radio resource control RRC request message, and the fifth information includes information for indicating a second system message and / or information for indicating all or part of the cells.

[0045] In combination with the second aspect, in certain implementations of the second aspect, the information used to indicate all or part of the cells satisfies the following conditions: when the fifth information is carried in a random access request, the information used to indicate all or part of the cells includes any one of the following: a bit map, a cell identifier of each cell in all or part of the cells, or at least one preamble sequence; or, when the fifth information is carried in an RRC request message, the information used to indicate all or part of the cells includes a bit map or a cell identifier of each cell in all or part of the cells.

[0046] In combination with the second aspect, in certain implementations of the second aspect, the fifth information includes information for indicating all or part of the cell; receiving the fifth information from the terminal device includes: receiving a random access request from the terminal device, the random access request being used to request a second system message; sending a random access response to the terminal device; receiving an RRC request message from the terminal device, the RRC request message including the fifth information.

[0047] In combination with the second aspect, in certain implementations of the second aspect, the method further includes: sending a system message of the second cell to the terminal device or sending information to the second cell for instructing the second cell to send a system message; and / or, sending information to the terminal device for indicating the public land mobile network of the second cell.

[0048] In a third aspect, a communication device is provided, configured to execute the method in any possible implementation of the first and second aspects. Specifically, the device includes a module configured to execute the method in any possible implementation of the first and second aspects.

[0049] In a fourth aspect, the present application provides another communication device, comprising a processor coupled to a memory and configured to execute instructions in the memory to implement the method of any possible implementation of the first and second aspects described above. Optionally, the device further comprises a memory. Optionally, the device further comprises a communication interface, the processor coupled to the communication interface.

[0050] In one implementation, the apparatus is a terminal device. When the apparatus is a terminal device, the communication interface may be a transceiver, or an input / output interface.

[0051] In another implementation, the device is a chip configured in a terminal device. When the device is a chip configured in a terminal device, the communication interface may be an input / output interface.

[0052] In a fifth aspect, a processor is provided, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes the method of any possible implementation of the first and second aspects.

[0053] In a specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a trigger, or various logic circuits. The input signal received by the input circuit may be, for example, but not limited to, received and input by a receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter. The input circuit and the output circuit may be the same circuit, which functions as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation of the processor and various circuits.

[0054] In a sixth aspect, a processing device is provided, comprising a processor and a memory. The processor is configured to read instructions stored in the memory and receive signals via a receiver and transmit signals via a transmitter to execute the method of any possible implementation of the first and second aspects.

[0055] Optionally, there are one or more processors and one or more memories.

[0056] Optionally, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0057] In the specific implementation process, the memory can be a non-transitory memory, such as a read-only memory (ROM), which can be integrated with the processor on the same chip or set on different chips. This application does not limit the type of memory and the setting method of the memory and the processor.

[0058] It should be understood that related data interaction processes, such as sending indication information, can be processes for outputting indication information from a processor, and receiving capability information can be processes for receiving input capability information from a processor. Specifically, the output data of the processor can be output to a transmitter, and the input data received by the processor can come from a receiver. The transmitter and receiver can be collectively referred to as a transceiver.

[0059] The processing device in the sixth aspect mentioned above can be a chip. The processor can be implemented by hardware or by software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor can be a general-purpose processor, which is implemented by reading the software code stored in the memory. The memory can be integrated in the processor or can be located outside the processor and exist independently.

[0060] In the seventh aspect, a computer program product is provided, which includes: a computer program (also referred to as code, or instructions), which, when executed, enables a computer to execute the method in any possible implementation of the first and second aspects above.

[0061] In an eighth aspect, a computer-readable storage medium is provided, which stores a computer program (also referred to as code, or instructions) which, when run on a computer, enables the computer to execute the method in any possible implementation of the first and second aspects above. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] FIG1 is a schematic diagram of a communication system used in an embodiment of the present application;

[0063] FIG2 is a schematic diagram of a flow chart of a random access method;

[0064] FIG3 is a flow chart of a communication method provided in an embodiment of the present application;

[0065] FIG4 is a flow chart of another communication method provided in an embodiment of the present application;

[0066] FIG5 is a flow chart of another communication method provided in an embodiment of the present application;

[0067] FIG6 is a flow chart of another communication method provided in an embodiment of the present application;

[0068] FIG7 is a flow chart of a method for a terminal device to obtain third information and fourth information provided by an embodiment of the present application;

[0069] FIG8 is a flow chart of another method for a terminal device to obtain third information and fourth information provided by an embodiment of the present application;

[0070] FIG9 is a flowchart of another method for a terminal device to obtain third information and fourth information provided by an embodiment of the present application;

[0071] FIG10 is a schematic block diagram of a communication device provided in an embodiment of the present application;

[0072] FIG11 is a schematic block diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0073] The technical solution in this application will be described below with reference to the accompanying drawings.

[0074] In some embodiments provided by the present application, terms such as "first" and "second" are used to distinguish identical or similar items with substantially the same functions and roles. For example, the first value and the second value are merely used to distinguish different values, and do not limit their order. Those skilled in the art can understand that terms such as "first" and "second" do not limit the quantity and execution order, and the terms such as "first" and "second" do not necessarily limit being different.

[0075] It should be noted that in the embodiments of the present application, words such as "exemplarily" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplarily" or "for example" in the present application should not be construed as more preferred or more advantageous than other embodiments or designs. Rather, the use of words such as "exemplarily" or "for example" aims to present relevant concepts in a specific manner.

[0076] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. The character " / " generally represents that the associated objects before and after are in an "or" relationship. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, and c can be single or multiple.

[0077] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, 5th generation (5G) system or New Radio (NR), future evolved communication systems, such as 6th generation (6G) system, etc.

[0078] The terminal device in the embodiments of the present application may also be referred to as: user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent or user device, etc.

[0079] The access network equipment and core network equipment in the embodiments of the present application may be collectively referred to as network equipment.

[0080] The core network device of the embodiment of the present application can be a core network device in a 4G system, such as a mobile management entity (MME), a serving gateway (sGW), etc., or a core network device in a 5G system, such as an access and mobility management function (AMF) network element, a user plane function (UPF) network element, etc. It can also be a core network device with other names, which is not limited in the embodiment of the present application.

[0081] The access network device can be any device with wireless transceiver capabilities. Access network equipment includes, but is not limited to, evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved NodeB, or home Node B, HNB), baseband unit (BBU), access point (AP) in a wireless fidelity (WiFi) system, wireless relay node, wireless backhaul node, transmission point (TP) or transmission and reception point (TRP), etc. It can also be a 5G base station (next-generation Node B, gNB) in a 5G, such as NR, system, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or it can also be a network node constituting a gNB or a transmission point, such as a baseband unit (BBU) or a distributed unit (DU), etc.

[0082] In some deployments, the gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (AAU). The CU implements some gNB functions, while the DU implements some gNB functions. For example, the CU may be responsible for processing non-real-time protocols and services, such as the radio resource control (RRC) layer, the service data adaptation protocol (SDAP) layer, and / or the packet data convergence protocol (PDCP) layer. The DU may be responsible for processing physical layer protocols and real-time services. For example, it may implement the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer. A DU can be connected to only one CU or to multiple CUs, and a CU can be connected to multiple DUs. Communication between the CU and DU can be achieved through the F1 interface. The AAU may implement some physical layer processing functions, RF processing, and active antenna related functions. Since the information of the RRC layer will eventually be delivered to the PHY layer and become the information of the PHY layer, or converted from the information of the PHY layer, therefore, in this architecture, high-layer signaling, such as RRC layer signaling, can also be considered to be sent by DU, or by DU+AAU.

[0083] It is understood that the access network device may include one or more of a CU node, a DU node, and an AAU node. In addition, the CU may be classified as an access network device in an access network (RAN) or as an access network device in a core network (CN), and this application does not limit this.

[0084] The access network equipment provides services for the cell. The terminal device communicates with the cell through the transmission resources (for example, frequency domain resources, or spectrum resources) allocated by the access network equipment. The cell can belong to a macro base station (for example, macro eNB or macro gNB, etc.) or a base station corresponding to a small cell. The small cells here can include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0085] To facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application is first described in detail with reference to FIG1 .

[0086] 1 shows a schematic diagram of a communication system 100 to which an embodiment of the present application is applied. The communication system 100 includes an access network, a core network, and an Internet Protocol (IP) multimedia subsystem (IMS) or the Internet.

[0087] The access network includes at least one terminal device, such as terminal device 110 shown in Figure 1; and at least one access network device, such as access network device 120 and access network device 130 shown in Figure 1. The core network device can be connected to the access network device via wireless or wired means, and the terminal device can be connected to the access network device via wireless means within the coverage area of ​​the access network device.

[0088] As shown in Figure 1, access network equipment 120 may include cell A and cell B, and access network equipment 130 may provide services for cell C. Terminal device 110 is located within the range of cell A. The terminal device's current serving cell is cell A, and it can exchange information with cell A. Cells B and C are neighboring cells of cell A.

[0089] Optionally, as the terminal device 110 moves, the signal strength of cell A weakens, and the terminal device 110 may perform a cell handover. In one example, assuming that the terminal device 110 moves into the range of cell B, and the signal strength of cell B is greater than the signal strength of cell A, the terminal device 110 may access cell B and exchange information with cell B. In another example, assuming that the terminal device 110 moves into the range of cell C, and the signal strength of cell C is greater than the signal strength of cell A, the terminal device 110 may access cell C and exchange information with cell C.

[0090] It should be understood that information interaction between the terminal device 110 and cell A or cell B may refer to information interaction between the terminal device 110 and the access network device 120 that provides services for cell A or cell B, and information interaction between the terminal device 110 and cell C may refer to information interaction between the terminal device 110 and the access network device 130 that provides services for cell C.

[0091] The access network device 120 and the access network device 130 can communicate with the terminal device 110 via a wireless link. The terminal device 110, the access network device 120 or the access network device 130 can be configured with multiple antennas, which may include at least one transmitting antenna for sending signals and at least one receiving antenna for receiving signals. In addition, the terminal device 110, the access network device 120 or the access network device 130 also additionally includes a transmitter chain and a receiver chain. Those skilled in the art will understand that they can all include multiple components related to signal transmission and reception (such as processors, modulators, multiplexers, demodulators, demultiplexers or antennas, etc.). Therefore, the access network device 120 and the access network device 130 can communicate with the terminal device 110 via multi-antenna technology.

[0092] It should be understood that Figure 1 is only a schematic diagram, and the communication system 100 may also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in Figure 1. The embodiment of the present application does not limit the number of core network devices, access network devices, and terminal devices included in the communication system 100.

[0093] Optionally, the communication system 100 may further include other network entities such as a network controller and a mobility management entity, but the embodiments of the present application are not limited thereto.

[0094] It should be understood that the communication system 100 shown in FIG1 is merely an example, and this application does not limit the specific architecture of the applicable system, nor does it limit the number and form of various devices included in each communication system. For example, the number of neighboring cells of the serving cell currently accessed by the terminal device may be greater, and the neighboring cells of the serving cell and the serving cell may belong to cells covered by the same access network device, or may belong to cells covered by different access network devices.

[0095] To facilitate understanding of the embodiments of the present application, the relevant terms involved in the embodiments of the present application are described in detail below.

[0096] 1. Cell

[0097] It is described from the perspective of resource management, mobility management or service unit. The coverage of each access network device can be divided into one or more cells, and the cell can be regarded as consisting of certain frequency domain resources. A cell can be an area within the coverage of the wireless network of the access network device. In an embodiment of the present application, different cells can correspond to different access network devices. For example, the access network device to which cell #1 belongs and the access network device to which cell #2 belongs can be different access network devices, such as base stations. That is to say, cell #1 and cell #2 can be managed by different base stations. In this case, it can be said that cell #1 and cell #2 are co-located, or in other words, co-located. The access network device to which cell #1 belongs and the access network device to which cell #2 belongs can also be different radio frequency processing units of the same base station, for example, radio remote units (RRUs). That is, cell #1 and cell #2 can be managed by the same base station, have the same baseband processing unit and intermediate frequency processing unit, but have different radio frequency processing units. This application does not specifically limit this.

[0098] 2. Network Energy Saving (NES) Community

[0099] It can be understood as a cell that does not periodically broadcast the system information block (SIB) 1. The NES cell usually broadcasts the SIB 1 based on a request from a terminal device. The request can be, for example, a wake-up signal (WUS).

[0100] Compared with cells that periodically broadcast SIB 1, NES cells can save power consumption of network equipment.

[0101] 3. Cell selection criteria (S criteria)

[0102] That is, after a terminal device detects a cell, it can camp on the cell only if it determines that the cell meets the S criterion. Meeting the S criterion can be understood as the cell selection received signal strength value (Srxlev) and the cell selection received signal quality value (Squal) are both greater than 0.

[0103] Srxlev is usually a negative value, indicating the strength level of the received signal. A larger value indicates a stronger signal.

[0104] Srxlev satisfies the following formula: Srxlev = Q rxlevmeas -(Q rxlevmin +Q rxlevminoffset )-P compensation -Q offsettemp

[0105] Among them, Qrxlevmeas Q is the measured cell signal reception level value, which can also be called received signal power, etc. It is used to indicate the strength of the received signal measured by the terminal device, and can also be understood as the reference signal received power (RSRP) measured by the terminal device; rxlevmin Q is the minimum value of the cell signal reception level, that is, the minimum required signal reception level value in the measured cell; rxlevminoffset is the first offset value, i.e., the offset value of the cell signal reception level value when the terminal device switches from the VPLMN to a PLMN with a higher priority; P compensation For the low frequency band (FR1), if the terminal device supports the maximum transmit power list in the non-standalone networking (NS) mode in 5G NR, which is additionally provided to meet specific requirements or conditions, then in SIB 1, SIB 2, and SIB 4, P compensation Satisfies the following formula: P compensation =max(P EMAX1 -P PowerClass ,0)-(min(P EMAX2 , P PowerClass )-min(P EMAX1 , P PowerClass )) (dB)

[0106] Otherwise, P compensation Satisfies the following formula: P compensation =max(P EMAX1 -P PowerClass ,0)dB

[0107] P EMAX1 and P EMAX2 The maximum transmit power used by the terminal device when performing uplink transmission. If the UE uses the supplementary uplink carrier (SUL) frequency, P EMAX2 .P PowerClass The maximum carrier frequency transmission power of the terminal device.

[0108] For the high frequency band (FR2), P compensation is 0.

[0109] Q offsettemp is a second offset value, that is, an offset value of the cell signal reception level value of the measurement cell selected within the first time period when the terminal device fails to establish a connection with the measurement cell.

[0110] It should be understood that the low frequency band can also be represented by FR1, such as the Sub-6 GHz frequency band; the high frequency band can be represented by FR2, such as the millimeter wave frequency band, and this application does not make specific limitations on this.

[0111] Squal is usually a negative value, indicating the quality of the received signal. A larger value indicates better signal quality.

[0112] Squal satisfies the following formula: Squal=Q qualmeas -(Q qualmin +Q qualminoffset )-Q offsettemp

[0113] Among them, Q qualmeas Q is the measured cell signal reception quality value, which is used to indicate the quality of the received signal measured by the terminal device, and can also be understood as the reference signal received quality (RSRQ) in the cell measured by the terminal device; qualmin Q is the minimum value of the cell signal reception quality value, that is, the minimum required cell signal reception quality value in the measured cell; qualminoffset is the third offset value, i.e., the offset value of the cell signal reception quality value when the terminal device switches from the VPLMN to a PLMN with a higher priority; Q offsettemp It is a fourth offset value, that is, an offset value of the cell signal reception quality value of the measurement cell selected within the second time period when the terminal device fails to establish a connection with the measurement area.

[0114] It should be understood that the Q involved in the above formula rxlevmeas , Q qualmeas , Q rxlevmin The symbols are for reference only. The parameters involved in the formulas such as the cell signal reception level value can also be represented by other letters or symbols. For example, the cell signal reception level value can also be represented by Q1, etc. This application does not make any specific limitations on this.

[0115] In the above two formulas, Q rxlevmin , Q rxlevminoffset 、P compensation , Q offsettemp , Q qualmin , Q qualminoffset and Q offsettemp The value configured by the network device to the terminal device can also be called the cell selection parameter. rxlevmeas and Q qualmeas Therefore, whether the terminal device can reside in the measurement cell needs to be determined based on the value measured by the terminal device and the cell selection parameter.

[0116] 4. Random access and preamble

[0117] Random access is the process by which a terminal device establishes an initial connection with a network device. In a mobile communication system, a terminal device needs to use the random access process to request network resources in order to communicate.

[0118] The random access method 200 may be as shown in FIG2 . The method 200 includes the following steps.

[0119] S201: A terminal device sends a message 1 (MSG 1) to a network device, where the message 1 includes a preamble sequence. Correspondingly, the network device receives the message 1 from the terminal device.

[0120] The preamble sequence, also known as the preamble code, plays a role in identification and positioning during the random access process, helping network equipment identify and distinguish access requests from different mobile terminal devices.

[0121] S202: In response to message 1, the network device sends message 2 (MSG 2) to the terminal device, where Message 2 includes uplink resources and timing advance. Correspondingly, the terminal device receives message 2 from the network device.

[0122] It should be understood that message 2 may also be referred to as a random access response. Message 2 may also include other parameters such as a modulation coding rate, which is not specifically limited in this application.

[0123] S203: The terminal device sends a message 3 (MSG 3) to the network device via the uplink resource from the network device, where the message 3 includes the identifier of the terminal device. Correspondingly, the network device receives the message 3 from the terminal device.

[0124] S204: The network device sends a message 4 (MSG 4) to the terminal device, where the message 4 includes an identifier of the terminal device allowed to access (contention resolution identifier). Correspondingly, the terminal device receives the message 4 from the network device.

[0125] It should be understood that during the random access process of the terminal device, whether the random access is successful can be determined based on whether the contention resolution identifier includes its own identifier. If so, the terminal device can send an acknowledgement (ACK) message to the network device, indicating that the random access of the terminal device is successful; if not, it indicates that the random access has failed.

[0126] 5. Synchronization signal block (SSB)

[0127] It is the basis for cell search. Synchronization signals include the primary synchronization signal (PSS) and the secondary synchronization signal (SSS). The PSS / SSS and the physical broadcast channel (PBCH) are together called the synchronization signal block (SSB). The master information block (MIB) is transmitted on the PBCH, and terminal devices obtain system information block (SIB) information by reading the MIB information.

[0128] Among them, MIB is used to carry scheduling information of the system information block, etc.

[0129] 6. System Messages

[0130] This information includes various system-related information that network equipment uses to notify terminal devices. For example, it includes network information about the terminal's cell, registration area information, common channel information, and information about other cells. System messages include system information block 1 (SIB 1) and other system information blocks (OSIs).

[0131] SIB 1 is used to carry cell selection parameters, access control information, initial access-related channel configuration information, and scheduling information for the remaining system information blocks, which contain specific data. System messages are carried on a set of radio frames and can be broadcast on the broadcast channel (BCH). The BCH is a unidirectional control channel that can broadcast public information about the cell. It consists of the frequency correction channel (FCCH), the synchronization channel (SCH), and the broadcast control channel (BCCH).

[0132] 7. Public land mobile network (PLMN)

[0133] It is a concept of mobile communication network, used to represent the entire mobile communication network of an operator.

[0134] 8. Visited public land mobile network (VPLMN)

[0135] In mobile communications, as a terminal device moves, it connects to the public mobile network it visits, rather than its home network. A VPLMN refers to the roaming network to which the terminal device is currently connected.

[0136] In the embodiments of this application, various terms and abbreviations, such as SIB, NES, PLMN, or VPLMN, are provided for ease of description and are not intended to limit this application in any way. This application does not exclude the possibility of defining other terms in existing or future protocols that can achieve the same or similar functions.

[0137] At present, since terminal devices can reside in cells that meet the S criterion, terminal devices in idle state (i.e., RRC_IDLE state) or inactive mode (RRC_INACTIVE mode) can select the cell to reside in based on the cell selection parameters included in the SIB 1 broadcast by each cell. Normally, each cell broadcasts SIB 1 periodically. However, for NES cells, SIB 1 needs to be broadcast based on the request of the terminal device. For example, the terminal device sends a wake-up signal to the NES cell; the NES cell broadcasts SIB 1 in response to the wake-up signal.

[0138] However, before obtaining the NES cell's SIB 1, the terminal device cannot determine the NES cell's cell selection parameters, meaning it cannot be sure whether it meets the requirements for residing in the NES cell. Therefore, after the terminal device sends a wake-up signal to the NES cell and receives the SIB 1 from the NES cell in response to the wake-up signal, the terminal device may not be able to reside in the NES cell because it does not meet the S criterion. This results in ineffective signaling interaction between the terminal device and the NES cell, which not only increases signaling overhead but also consumes more power for the terminal device and network equipment.

[0139] In view of this, the present application provides a communication method, in which, before a terminal device sends a wake-up signal for requesting SIB 1, the terminal device can first determine the possibility of meeting the S criterion based on the measured RSRP and / or RSRQ. In this way, the terminal device can send a wake-up signal to a cell with a greater probability of meeting the S criterion, thereby improving the success rate of the terminal device successfully camping on the cell, reducing ineffective signaling interactions between the terminal device and network equipment, helping to reduce signaling overhead and reducing power consumption of the terminal device and network equipment.

[0140] The following describes in detail the communication method provided in the embodiment of the present application, taking the terminal device, the first cell or the second cell as the execution subject. The specific form and quantity of each device shown therein are only examples and should not constitute any limitation on the implementation of the method provided in the present application.

[0141] The terminal device in the embodiment of the present application can be the terminal device itself, or it can be a chip, chip system or processor that supports the terminal device to implement the communication method, or it can be a logic module or software that can implement all or part of the terminal device functions; the network device in the embodiment of the present application can be the network device itself, or it can be a chip, chip system or processor that supports the network device to implement the communication method, or it can be a logic module or software that can implement all or part of the network device functions. This application does not impose specific restrictions on this.

[0142] It should be noted that in the embodiments of the present application, the interaction between a terminal device and a cell refers to the interaction between the terminal device and the access network device corresponding to the cell. The access network device corresponding to the cell can be understood as the access network device serving the cell, or the access network device's coverage area includes the cell. For the sake of brevity, this will not be further described below.

[0143] Below, the communication method is described in detail with the terminal device as the execution subject.

[0144] An embodiment of the present application provides a communication method 1000. The method 1000 is applicable to a communication system 100. The method 1000 includes the following steps.

[0145] S1001. Receive first information from a first cell, where the first information is used to configure resources for sending second information, and the second information is used to request a system message from a second cell.

[0146] The system message can also be understood as the SIB 1 of the second cell. The second information can be understood as a request for the SIB 1 of the second cell or a wake-up signal. The first information can be used, for example, to configure the time-frequency domain resources used by the terminal device to send the second information, and can also be used to instruct the terminal device on how to send the second information. This allows the terminal device to determine the receiving end of the second information and send the second information to the receiving end using the time-frequency domain resources configured by the first information.

[0147] It should be understood that the second information may also be carried in a system message broadcast by the first cell, such as SIB 1, or may be carried in other public information. Public information may include, but is not limited to, one or more of the following: a system message, a synchronization signal block, a paging message, or an early paging indication, which is not specifically limited in this application.

[0148] Through S1001, the terminal device can determine a method for sending a system message for requesting a second cell.

[0149] S1002: Send second information to a second cell or the first cell, where the second cell is selected based on a first condition, and the first condition is related to a reference signal received power and / or a reference signal received quality.

[0150] It should be understood that if the first information instructs the terminal device to send the second information to the first cell, for example, the resources configured by the first information are the resources of the first cell, then the terminal device sends the second information to the first cell; if the first information instructs the terminal device to send the second information to the second cell, for example, the first information configures the resources of the second cell, then the terminal device sends the second information to the second cell.

[0151] Since the determination of the S criterion is related to the reference signal received power and the reference signal received quality, the first condition is related to the reference signal received power and / or the reference signal received quality, and it can also be understood that the first condition is related to satisfying the S criterion. That is, when the terminal device determines that the second cell satisfies the first condition, it means that the terminal device is more likely to determine that the second cell satisfies the S criterion, because the terminal device is more likely to reside in the second cell after requesting the system information of the second cell.

[0152] It is understood that before S1002, the terminal device may first determine that the second cell meets the first condition. Since the terminal device requests the system information of the second cell, it indicates that the terminal device desires to camp on the second cell. Therefore, if the terminal device determines that the second cell meets the first condition, it may request the system information of the second cell.

[0153] Optionally, before S1002, the terminal device may determine whether multiple cells meet the first condition, and the second cell is all or part of the multiple cells that meet the first condition. That is, the terminal device may determine at least one cell that meets the first condition from the multiple cells, and select the second cell from the at least one cell.

[0154] In the communication method of the present application, before the terminal device sends information for requesting the second cell's system message, the terminal device can first determine the possibility that the second cell meets the S criterion based on the measured RSRP and / or RSRQ. In this way, the terminal device can request the second cell's system message when it is determined that the second cell is likely to meet the S criterion, thereby increasing the success rate of the terminal device residing in the second cell based on the second cell's system message. This can reduce ineffective signaling interactions between the terminal device and the network device, help reduce signaling overhead, and reduce the power consumption of the terminal device and the network device.

[0155] Based on the above method 1000, the first cell and the second cell may be the same cell or different cells.

[0156] In the first case, the first cell and the second cell are different cells. For example, the first cell may be a cell that periodically broadcasts SIB 1, and the second cell may be an NES cell, for example, a cell that sends SIB 1 only after a UE requests SIB 1.

[0157] As an optional embodiment, after S1002, the method 1000 further includes: receiving a system message from the first cell or from the second cell.

[0158] The system message of the second cell may also be understood as SIB 1 of the second cell.

[0159] It should be understood that, when the first cell and the second cell are not the same cell, the system message of the second cell can be sent to the terminal device by the second cell; or it can be sent to the terminal device by the first cell.

[0160] First, the first condition will be described in detail.

[0161] As an optional embodiment, the first condition includes: item 1, selecting the second cell according to RSRP sorting and / or RSRQ sorting; and / or item 2, the difference between RSRP and the first parameter is greater than or equal to 0 and / or the difference between RSRQ and the second parameter is greater than or equal to 0.

[0162] For item 1, the first condition is related to the RSRP ranking and / or RSRQ ranking. And the second cell meeting the first condition can also be understood as the second cell being a cell with a greater probability of meeting the S criterion determined based on the RSRP ranking and / or RSRQ ranking.

[0163] Exemplarily, the second cell is a cell with the largest RSRP in the RSRP ranking and / or the largest RSRQ in the RSRQ ranking. Alternatively, the second cell is a cell with an RSRP greater than a preset threshold 1 in the RSRP ranking and / or an RSRQ greater than a preset threshold 2 in the RSRQ ranking.

[0164] Optionally, the RSRP sorting may be obtained by arranging the RSRPs of multiple cells obtained by the terminal device based on the measurement in a descending order or a descending order. And / or, the RSRQ sorting may be obtained by arranging the RSRQs of multiple cells obtained by the terminal device based on the measurement in a descending order or a descending order.

[0165] In this way, the terminal device can determine the RSRP sorting and / or RSRQ sorting by the terminal device itself, and then the terminal device can determine the selected second cell through the RSRP sorting and / or RSRQ sorting, and determine whether the second cell meets the first condition, so that the signaling overhead is smaller and the power consumption of the network device is smaller.

[0166] Regarding item 2, since a higher RSRP indicates a stronger received signal, and a higher RSRQ indicates better received information quality, if RSRP minus the first parameter is greater than or equal to 0, the received signal strength in the second cell is relatively strong; if RSRQ minus the second parameter is greater than or equal to 0, the received signal quality in the second cell is relatively good. Furthermore, as RSRP and RSRQ increase, the likelihood that the second cell meets the S criterion increases.

[0167] Based on the above embodiment, optionally, the first parameter includes a first preset threshold; or, the first parameter includes one or more of the following: a minimum value of a cell signal reception level value, a first offset value, a first power, or a second offset value; wherein the first offset value is an offset value of a cell signal reception level value when switching from a VPLMN to a public land mobile network (PLMN) with a higher priority, and the second offset value is an offset value of a cell signal reception level value for selecting a second cell within a first time period when establishing a connection with the second cell fails.

[0168] It should be understood that the first preset threshold is a value configured by the second cell or the first cell. When the first preset threshold is a value configured by the second cell, the second cell needs to interact with the first cell to configure the first preset threshold, that is, the second cell sends the first preset threshold to the first cell so that the first cell can send the first preset threshold to the terminal device. The first preset threshold may also be referred to as an RSRP threshold or a cell signal reception level value threshold, etc., which is not specifically limited in this application.

[0169] When the first parameter includes a first preset threshold, the first condition may include RSRP being greater than or equal to the first preset threshold. Furthermore, when it is determined that the RSRP of the terminal device is greater than or equal to the first preset threshold, it indicates that the RSRP of the second cell is greater and the second cell is more likely to meet the S criterion, i.e., the terminal device has a higher success rate in successfully camping on the second cell.

[0170] It should be understood that one or more of the minimum cell signal reception level, the first offset, the first power, or the second offset can be values ​​configured by the second cell. The second cell needs to interact with the first cell to configure one or more of the minimum cell signal reception level, the first offset, the first power, or the second offset. Specifically, the second cell transmits one or more of the minimum cell signal reception level, the first offset, the first power, or the second offset to the first cell, facilitating the first cell transmitting one or more of the minimum cell signal reception level, the first offset, the first power, or the second offset to the terminal. The minimum cell signal reception level can be understood as the minimum signal reception level required in the second cell. When the first parameter includes multiple of the above, RSRP minus the first parameter can be understood as RSRP minus the sum of the first parameter, or as RSRP minus the content parameters of the multiple parameters included in the first parameter.

[0171] It can be understood that the first offset value and / or the second offset value are optional contents in the first parameter. In the case where the terminal device switches from the VPLMN to a PLMN with a higher priority, the terminal device can use the first offset value to determine whether the second cell meets the first condition, that is, the first parameter includes the first offset value; otherwise, the first parameter does not include the first offset value. In the case where the terminal device has experienced a connection failure with the second cell, within the first time period, the terminal device can use the second offset value to determine whether the second cell meets the first condition, that is, the first parameter includes the second offset value; otherwise, the first parameter does not include the second offset value.

[0172] It should be understood that the first duration may be a duration predefined by an agreement between the terminal device and the network device, or a value configured by the second cell.

[0173] It should be noted that the fact that the first parameter does not include the first offset value and / or the second offset value does not mean that the second cell is not configured with the first offset value and / or the second offset value, that is, the second cell can be configured with the first offset value and / or the second offset value, but the terminal device may not use the first offset value and / or the second offset value to determine whether the second cell meets the first condition.

[0174] When the first parameter includes one or more of the above cell selection parameters, since the cell selection parameter is related to the S criterion, when RSRP minus the first parameter is greater than or equal to 0, it means that the second cell is more likely to meet the S criterion, that is, the terminal device has a higher success rate in residing in the second cell.

[0175] Based on the above embodiment, optionally, the second parameter includes a second preset threshold; or, the second parameter includes one or more of the following: a minimum value of the cell signal reception quality value, a third offset value, or a fourth offset value; wherein the third offset value is an offset value of the cell signal reception quality value when switching from accessing a public land mobile network to a public land mobile network with a higher priority, and the fourth offset value is an offset value of the cell signal reception quality value of the second cell selected within the second time period when establishing a connection with the second cell fails.

[0176] It should be understood that the second preset threshold is a value configured for the second cell or the first cell. When the second preset threshold is a value configured for the second cell, the second cell needs to interact with the first cell to configure the second preset threshold, that is, the second cell sends the second preset threshold to the first cell so that the first cell sends the first preset threshold to the terminal device. The second preset threshold may also be referred to as an RSRQ threshold or a cell signal reception quality value threshold, etc., which is not specifically limited in this application.

[0177] When the second parameter includes a second preset threshold, the first condition may include RSRQ being greater than or equal to the second preset threshold. Furthermore, when it is determined that the RSRQ of the terminal device is greater than or equal to the second preset threshold, it indicates that the RSRQ of the second cell is greater, and the second cell is more likely to meet the S criterion, that is, the terminal device has a higher success rate in successfully camping on the second cell.

[0178] It should be understood that the minimum value of the cell signal reception quality value, one or more of the third offset value or the fourth offset value can be values ​​configured for the second cell. The second cell needs to interact with the first cell to configure the minimum value of the cell signal reception quality value, one or more of the third offset value or the fourth offset value, that is, the second cell sends the minimum value of the cell signal reception quality value, one or more of the third offset value or the fourth offset value to the first cell, so that the first cell sends the minimum value of the cell signal reception quality value, one or more of the third offset value or the fourth offset value to the terminal device. The minimum value of the cell signal reception quality value can be understood as the minimum signal reception quality value required in the second cell. In the case where the second parameter includes the above multiple items, RSRQ minus the second parameter can be understood as RSRQ minus the sum of the second parameter, or the content parameters of the above multiple items included in the second parameter can be subtracted separately.

[0179] It can be understood that the third offset value and / or the fourth offset value are optional contents in the second parameter. In the case where the terminal device switches from the VPLMN to a PLMN with a higher priority, the terminal device can use the third offset value to determine whether the second cell meets the first condition, that is, the second parameter includes the third offset value; otherwise, the second parameter does not include the third offset value. In the case where the terminal device has experienced a connection failure with the second cell, within the second time period, the terminal device can use the fourth offset value to determine whether the second cell meets the first condition, that is, the second parameter includes the fourth offset value; otherwise, the second parameter does not include the fourth offset value.

[0180] It should be noted that the fact that the second parameter does not include the third offset value and / or the fourth offset value does not mean that the second cell is not configured with the third offset value and / or the fourth offset value, that is, the second cell can be configured with the third offset value and / or the fourth offset value, but the terminal device may not use the third offset value and / or the fourth offset value to determine whether the second cell meets the first condition.

[0181] It should be understood that the second duration may be a duration predefined in an agreement between the terminal device and the network device, or a value configured by the second cell.

[0182] Furthermore, the fact that the first parameter and / or the second parameter are configured by the second cell does not necessarily mean that the first parameter and / or the second parameter are sent to the terminal device by the second cell. Alternatively, the second cell may send the first parameter and / or the second parameter to the first cell; and the first cell then sends the first parameter and / or the second parameter configured by the second cell to the terminal device.

[0183] The following describes in detail how the terminal device obtains the first parameter and / or the second parameter.

[0184] As an optional embodiment, method 1000 also includes: the terminal device receives third information and fourth information from the first cell, the third information is used to indicate the first cell list, the fourth information is used to indicate the first parameters and / or second parameters of all or part of the cells in the first cell list, and the second cell belongs to all or part of the cells.

[0185] In this way, the terminal device can obtain the first parameters and / or second parameters of all or part of the cells included in the first cell list from the first cell, and determine the second cell that meets the first condition from all or part of the cells, so that a request for the system message of the second cell can be sent to the second cell.

[0186] It should be understood that the first cell list may include multiple cells, and the multiple cells in the first cell list may be NES cells. The first parameter and / or the second parameter can refer to the above description and will not be repeated here.

[0187] Optionally, the third information may include cell identifiers of multiple cells, and the cell identifiers of the multiple cells include the cell identifier of the second cell. That is, the cell identifiers of the multiple cells constitute the first cell list. In this way, the terminal device can determine each cell based on the cell identifiers and obtain the fourth information of the second cell from the first cell.

[0188] It should be noted that the first parameter and / or second parameter of all or part of the cells can be understood as the first parameter and / or second parameter of each cell in all or part of the cells. In some possible implementations, the first parameter and / or second parameter of each cell in all or part of the cells can be obtained by the first cell from each cell in all or part of the cells. For example, for the second cell in all or part of the cells, the first cell obtains the first parameter and / or second parameter of the second cell from the second cell.

[0189] In this way, each cell in all or part of the cells can determine whether to allow the terminal device to reside based on the first parameter and / or the second parameter.

[0190] For the message carrying the third information and the fourth information, there are the following two situations.

[0191] In the first case, based on the above embodiment, optionally, the third information and the fourth information are carried in the same system message. In this way, the terminal device can obtain the third information and the fourth information from the same system message, making the terminal device more efficient in obtaining the third information and the fourth information.

[0192] Optionally, in the first case, the fourth information may be used to indicate the first parameter and / or second parameter of each cell in the first cell list, so that the terminal device can determine the first cell list and the first parameter and / or second parameter of each cell in the first cell list through a single message, thereby facilitating the terminal device to select a cell that meets the first condition from the first cell list.

[0193] In some possible implementations, the system message carrying the third information and the fourth information may be, for example, the first cell's SIB 1. Since the first cell may periodically broadcast SIB 1, the first cell may send the third information and the fourth information to the terminal device via the existing SIB 1.

[0194] In some possible implementations, the third information and the fourth information are in one-to-one correspondence.

[0195] Exemplarily, in mode 1, the cell identifiers of N cells in all or part of the cells and the first parameters and / or second parameters of the N cells are carried in a field 1, where N is an integer greater than or equal to 1. That is, field 1 carries N cell identifiers and the first parameters and / or second parameters corresponding to the N cell identifiers. For example, field 1 carries: {cell identifiers of N cells; first parameters and / or second parameters of N cells}.

[0196] It should be noted that the first parameter and / or the second parameter of the N cells may refer to one first parameter and / or one second parameter, that is, each of the N cells corresponds to one first parameter and / or one second parameter.

[0197] Mode 2: The third information is carried in field 2, and the fourth information is carried in field 3. For example, the method can be implemented in the following two ways.

[0198] In implementation 1, the first cell list in the third information and the list of first parameters and / or second parameters in the fourth information correspond in sequence, i.e., the first cell in the first cell list in the third information corresponds to the first first parameter and / or the first second parameter in the list of first parameters and / or second parameters in the fourth information, the second cell in the first cell list in the third information corresponds to the second first parameter and / or the second second parameter in the list of first parameters and / or second parameters in the fourth information, and so on. In this case, the number of information parameters in the third information and the number of information parameters in the fourth information are the same.

[0199] Implementation 2: The first cell list in the third information corresponds to a first parameter and / or a second parameter in the fourth information, that is, all cells in the third information correspond to a first parameter and / or a second parameter in the fourth information. For example, field 2 carries a sequence of cell identifiers (size(1…maxnum1)); field 3 carries a sequence of first parameters and / or second parameters (size(1…maxnum2)); wherein maxnum1 is the number of supported cell identifiers, that is, the maximum number of supported cell identifiers, and maxnum2 is the number of supported first parameters and / or second parameters, that is, the maximum number of supported first parameters and / or second parameters. Size(1…maxnum1) is the number of cell identifiers configured in field 2, and size(1…maxnum2) is the number of first parameters and / or second parameters configured in field 3. It can be understood that in the case of implementation 1, size(1...maxnum1) and size(1...maxnum2) are equal, that is, the cell identifier and the first parameter and / or the second parameter are one-to-one corresponding, and in the case of implementation 2, size(1...maxnum2) is 1, that is, the cells represented by all cell identifiers correspond to one first parameter and / or one second parameter.

[0200] In the second case, based on the above embodiment, optionally, the third information is carried in the first system message, and the fourth information is carried in the second system message. The first system message and the second system message are messages of different systems. In this way, a system message of the first cell does not carry too much information.

[0201] In some possible implementations, the terminal device obtains the third information and the fourth information in the following manner. Method 1000 further includes: receiving the third information from the first cell; sending fifth information to the first cell, the fifth information being used to request the fourth information or the second system message; and receiving the fourth information from the first cell.

[0202] It should be understood that the fourth information may be used to indicate the first parameter and / or second parameter of all or part of the cells in the first cell list. In the case where the fifth information is used to request the fourth information, the fifth information may include information indicating all or part of the cells.

[0203] In one example, the fifth information may include a bitmap that is used to indicate all or some of the cells. The number of bits in the bitmap may be the number of cells included in the first cell list. Each bit in the bitmap is used to indicate a cell in the first cell list. For example, 0 may indicate unselected and 1 may indicate selected, in which case the cells indicated by the two 1s in 110000 are all or some of the cells; or, 1 may indicate unselected and 0 may indicate selected, in which case the cells indicated by 0 in 111110 are all or some of the cells.

[0204] In another example, the fifth information may include a cell identifier of each of all or some of the cells. The first cell may then determine all or some of the cells based on the cell identifiers, thereby sending the first parameter and / or second parameter of all or some of the cells to the terminal device.

[0205] In the case where the fifth information is used to request the second system message, since the second system message can carry the fourth information, the terminal device can also obtain the fourth information by requesting the second system message.

[0206] In the above manner, after obtaining the first cell list, the terminal device can request the first parameter and / or second parameter of all or part of the cells in the first cell list from the first cell, so that the terminal device can request the parameters of the cell in which the terminal device wishes to reside.

[0207] It should be noted that, in some possible implementations, the first system message may be SIB 1 of the first cell. The second system message may be another SIB, such as SIB X, where X may also be an integer greater than 1. The second system message may be a newly defined SIB for sending the fourth information, or an existing SIB, such as SIB 2. This application does not impose any specific limitations on this.

[0208] Based on the above embodiment, the fifth information may be sent in the following manner.

[0209] As an optional embodiment, the fifth information is carried in a random access request or a radio resource control (RRC) request message, and the fifth information includes information for indicating the second system message and / or information for indicating all or part of the cells.

[0210] It should be understood that the random access request can be understood as message 1 in the random access process. The RRC request message can be understood as message 3 in the random access process, and can also be called RRC system information request or RRC connection request.

[0211] In this way, the first cell can determine through the fifth information that it needs to send information indicating the first parameters and / or second parameters of all or part of the cells to the terminal device through the second system message.

[0212] Based on the above embodiments, for example, it can be implemented in the following ways.

[0213] Method 1: The fifth information is carried in the random access request. The fifth information includes information indicating the second system message and / or information indicating all or part of the cells; the information indicating all or part of the cells includes any one of the following: a bit map, a cell identifier of each cell in all or part of the cells, or at least one preamble sequence.

[0214] When the fifth information includes information indicating the second system message, the information indicating the second system message may be, for example, a first identifier carried in a first field, where the first field is used to carry information requesting the second system message or the fourth information. The first identifier may be, for example, 1, 0, 00, or SIB X. In this way, the first cell may determine that the terminal device requests the second system message based on the first identifier in the first field.

[0215] It should be noted that, when the fifth information includes information for indicating the second system message, all or part of the cells may be all cells in the first cell list. That is, when the first cell determines that the terminal device requests the second system message, it sends information indicating the first parameter and / or second parameter of all cells to the terminal device through the second system message.

[0216] In the case where the fifth information includes information for indicating all or part of the cells, when the information for indicating all or part of the cells is a bitmap or a cell identifier of each cell in all or part of the cells, you can refer to the above description and will not repeat it here. When the information for indicating all or part of the cells is at least one preamble sequence, at least one preamble sequence can correspond one-to-one with all or part of the cells. Then each preamble sequence in at least one preamble sequence corresponds to one cell; or, one preamble sequence of at least one preamble sequence can also be used to indicate multiple cells in all or part of the cells; or, multiple preamble sequences of at least one preamble sequence can also be used to indicate one cell in all or part of the cells. This application does not make specific limitations on this.

[0217] It should be noted that at least one preamble sequence can be used to indicate all or some cells. In addition, at least one preamble sequence can also indicate a second system message. That is, based on the at least one preamble sequence, the first cell can determine all or some cells and can determine that information indicating the first parameter and / or second parameter of all or some cells needs to be sent through the second system message.

[0218] In the case where the fifth information includes information for indicating all or part of the cells and information for indicating the second system message, the first cell can determine all or part of the cells based on the information for indicating all or part of the cells, and can determine based on the information for indicating the second system message that information on the first parameters and / or second parameters for indicating all or part of the cells needs to be sent to the terminal device through the second system message.

[0219] Method 2: The fifth information is carried in the RRC request message, and the fifth information includes information indicating all or part of the cells and / or information indicating the second system message. The information indicating all or part of the cells may be a bitmap or cell identifiers of all or part of the cells.

[0220] In addition, the information used to request the second system message may be, for example, the first identifier carried in the first field. In addition to the fact that the fifth information in Method 2 is carried in the RRC request message, the difference from Method 1 is that the information used to indicate all or part of the cells cannot be at least one preamble sequence. Apart from this, the implementation of Method 2 is similar to that of Method 1. Please refer to the above description and will not be repeated here.

[0221] Method three, the fifth information includes information used to indicate all or part of the cells; sending the fifth information to the first cell can be implemented in the following manner: sending a random access request to the first cell, the random access request is used to request a second system message; receiving a random access response from the first cell; based on the random access response, sending an RRC request message to the first cell, the RRC request message carries the fifth information.

[0222] Different from method one and method two, in method three, the random access request is used to request the second system message, and the RRC request message carries the fifth information, that is, the terminal device instructs the first cell to send information indicating the first parameters and / or second parameters of all or part of the cells through the random access request and RRC request message through the second system message.

[0223] In this way, the terminal device can request the first cell to send the second system message based on message 1; when receiving a response from the first cell, request the first parameter and / or second parameter of all or part of the cell from the first cell through message 3.

[0224] Among them, since the information used to indicate all or part of the cells is carried in the RRC request message, the information used to indicate all or part of the cells is the cell identifier or bit map of all or part of the cells, that is, the information used to indicate all or part of the cells is not at least one preamble sequence.

[0225] In addition, the implementation of method three is similar to that of method one. Please refer to the above description and will not be repeated here.

[0226] As an optional embodiment, the method 1000 further includes: receiving information indicating a PLMN of the second cell from the first cell.

[0227] It should be understood that when a terminal device switches from a VPLMN to a PLMN corresponding to a second cell with a higher priority, the terminal device needs to obtain the PLMN of the second cell. Therefore, the first cell can indicate the PLMN of the second cell to the terminal device. The PLMN of the second cell can be obtained by the first cell from the second cell.

[0228] It should be noted that, if the PLMNs of the first cell and the second cell are the same, the first cell may not send information indicating the PLMN of the second cell to the terminal device. In this case, the terminal device may determine that the PLMNs of the first cell and the second cell are the same.

[0229] In the second case, the first cell and the second cell are the same cell.

[0230] In the second case, the second cell may be an NES cell, and the first condition may be selecting the second cell according to the reference signal received power ranking and / or the reference signal received quality ranking. That is, the terminal device may determine the second cell that is more likely to meet the S criterion based on the RSRQ ranking and / or RSRP ranking of the multiple cells measured.

[0231] As an optional embodiment, method 1000 further includes: receiving a system message from a second cell. That is, if the terminal device determines, based on the RSRQ ranking and / or RSRP ranking, that the second cell is likely to meet the S criterion, the terminal device may send second information to the second cell requesting the system message from the second cell. In this way, the terminal device can receive the system message from the second cell.

[0232] The embodiment of the present application further provides a communication method 2000. The method 2000 is applicable to the communication system 100. The method 2000 may be executed by a network device, for example, the first cell or the second cell in the method 1000. The method 2000 includes the following steps:

[0233] S2001. The first cell sends first information to the terminal device, where the first information is used to configure resources for sending second information, and the second information is used to request a system message from the second cell.

[0234] Optionally, if the first cell and the second cell are not the same cell, the first cell may be a cell that periodically broadcasts system messages. The first information may be carried, for example, in the SIB 1 of the first cell. Therefore, the first cell may indicate the first information to the terminal device via the SIB 1. Alternatively, if the first cell and the second cell are the same cell, the first cell may be an NES cell, and the first information may be carried in other public messages such as SSBs.

[0235] S2002. The first cell or the second cell receives second information from the terminal device, where the second cell is selected based on a first condition, and the first condition is related to reference signal received power and / or reference signal received quality.

[0236] When the first cell and the second cell are not the same cell, there are three implementation scenarios for S2002.

[0237] In one case, the first cell receives second information from the terminal device; in response to the second information, the first cell sends a system message of the second cell.

[0238] In this case, the first cell may obtain the cell selection parameter of the second cell from the second cell, so that the first cell can broadcast the system information of the second cell.

[0239] It should be understood that when the first cell and the second cell are co-located, it may be optional for the first cell to obtain the cell selection parameters of the second cell from the second cell, that is, the first cell may determine that the second cell is an NES cell, the cell identifier of the second cell, or the cell selection parameters of the second cell and other information.

[0240] In another case, the first cell receives second information from the terminal device; in response to the second information, the first cell sends information to the second cell indicating that the second cell broadcasts a system message. Correspondingly, the second cell receives information from the first cell indicating that the second cell broadcasts a system message; the second cell sends a system message.

[0241] In this case, the first cell does not need to obtain the cell selection parameters of the second cell, which reduces the interaction between the first cell and the second cell.

[0242] In another case, the second cell receives second information from the terminal device; in response to the second information, the second cell sends a system message of the second cell.

[0243] In this case, the terminal device does not need to obtain the system information of the second cell through the first cell. That is, the terminal device can obtain the system information of the second cell directly from the second cell, which reduces the power consumption of the first cell.

[0244] In the above three cases, optionally, before S2001, method 2000 further includes: the second cell sending information indicating that the second cell is an NES cell and / or a cell identifier of the second cell to the first cell, so that the first cell can determine that the second cell is an NES cell and thus instruct the terminal device on a method for requesting system information of the second cell.

[0245] In the case that the first cell and the second cell are the same cell, the execution entity of S2002 is the second cell.

[0246] It should be understood that the implementation of S2001 and S2002 is similar to the implementation of S1001 and S1002 in method 1000, and the content regarding the first condition is also similar to the description of the first condition in method 1000. Please refer to the above description and will not repeat it here.

[0247] Below, for the case where the first cell and the second cell are not the same cell, the manner in which the first cell sends the first parameters and / or second parameters of all or part of the cells related to the first condition to the terminal device is described in detail. It should be noted that this part is similar to the manner in which the terminal device obtains the first parameters and / or second parameters of all or part of the cells in method 1000. Please refer to the description above and will not be repeated here.

[0248] As an optional embodiment, method 2000 also includes: the first cell sends third information and fourth information to the terminal device, the third information is used to indicate the first cell list, and the fourth information is used to indicate the first parameters and / or second parameters of all or part of the cells in the first cell list, and the second cell belongs to all or part of the cells.

[0249] The first parameter and / or second parameter of the second cell may be obtained by the first cell from the second cell. For example, the second cell sends information indicating the first parameter and / or second parameter of the second cell to the first cell; correspondingly, the first cell receives information indicating the first parameter and / or second parameter of the second cell from the second cell. Alternatively, before the second cell sends information indicating the first parameter and / or second parameter of the second cell to the first cell, the first cell may send information requesting the first parameter and / or second parameter of the second cell to the second cell, and the second cell, in response to the information requesting the first parameter and / or second parameter of the second cell, sends information indicating the first parameter and / or second parameter of the second cell to the first cell.

[0250] For the message carrying the third information and the fourth information, there are the following two situations.

[0251] In case 1, based on the above embodiment, optionally, the third information and the fourth information are carried in the same system message. In this way, the terminal device can obtain the third information and the fourth information from the same system message, making the terminal device more efficient in obtaining the third information and the fourth information.

[0252] Case 2: Based on the above embodiment, optionally, the third information is carried in the first system message, and the fourth information is carried in the second system message.

[0253] It should be understood that the way of carrying the third information and the fourth information in case 1 is similar to the first case in method 1000, and the way of carrying the third information and the fourth information in case 2 is similar to the second case in method 1000. Please refer to the above description and will not repeat it here.

[0254] In case 2, optionally, the first cell may send fourth information to the terminal device based on the situation of the terminal device. Method 2000 further includes: the first cell sending third information to the terminal device; the first cell receiving fifth information from the terminal device, the fifth information being used to request fourth information or a second system message; and the first cell sending the fourth information to the terminal device.

[0255] When the fifth information is used to request the fourth information, the fifth information may be, for example, a bitmap or a cell identifier of each cell in all or part of the cells, etc. For details, please refer to the description of the fifth information in method 1000, which will not be repeated here.

[0256] Based on the above embodiment, the fifth information may also be transmitted according to any one of the methods 1 to 4 in method 1000. Please refer to the above description and will not be repeated here.

[0257] Regarding the fourth mode in method 1000, the first cell may optionally implement the method in the following manner: the fifth information is used to request the fourth information; the first cell receives the fifth information from the terminal device, including: the first cell receives message 1 from the terminal device, where message 1 is used to request the second system message; in response to message 1, the first cell sends message 2 to the terminal device; and the first cell receives message 3 from the terminal device, where message 3 includes the fifth information.

[0258] In this way, the first cell can send the first parameters and / or second parameters of all or part of the cells to the terminal device based on all or part of the cells indicated in the fifth information of the terminal device.

[0259] As an optional embodiment, the method 2000 further includes: the first cell sending information indicating the public land mobile network of the second cell to the terminal device.

[0260] The first cell may obtain the PLMN of the second cell from the second cell. Exemplarily, the second cell sends information indicating the PLMN of the second cell to the first cell; or the first cell sends information requesting the PLMN of the second cell to the second cell; and in response to the information requesting the PLMN of the second cell, the second cell sends information indicating the PLMN of the second cell to the first cell.

[0261] It should be understood that any multiple of the information for indicating the first parameter and / or the second parameter of the second cell, the information for indicating that the second cell is an NES cell, the cell identifier of the second cell, or the information for indicating the PLMN of the second cell can be sent through the same signaling or through different signaling, and this application does not make any specific limitations on this.

[0262] Below, the communication method provided in the embodiment of the present application is described in detail from the perspective of device interaction with reference to Figures 3 to 7. The specific form and quantity of each device shown therein are only examples and should not constitute any limitation on the implementation of the method provided in the present application. Below, the communication method of the embodiment of the present application is described in detail, taking the terminal device, the first cell, and the second cell as the execution entities as an example.

[0263] It should be noted that FIG3 to FIG6 respectively show communication methods in four different scenarios, which are described in detail as follows.

[0264] FIG3 is a flow chart of a method 300 provided in an embodiment of the present application. The method 300 is applicable to the communication system 100 and includes the following steps:

[0265] S301: A second cell sends information 1 to a first cell, where the information 1 indicates that the second cell is an NES cell. Correspondingly, the first cell receives the information 1 from the second cell.

[0266] It should be understood that information 1 may also include one or more of the following items: the cell identifier of the second cell, information used to indicate cell selection information of the second cell or information used to indicate the first parameter and / or second parameter of the second cell, indication information that the second cell is an NES cell, etc.

[0267] In this way, the first cell can instruct the terminal device on how to obtain the system information of the second cell. Alternatively, the first cell can indicate the first parameter and / or second parameter of the second cell to the terminal device, so that the terminal device can determine the possibility that the second cell meets the S criterion and thus determine whether to request the system information of the second cell.

[0268] Optionally, the information 1 may also be any one or more of the following: a cell identifier of the second cell, information indicating cell selection information of the second cell, or information indicating a first parameter and / or a second parameter of the second cell. That is, the first cell may also determine that the second cell is an NES cell based on one or more of the above items.

[0269] S302: The first cell sends first information to the terminal device, where the first information is used to configure resources for second information. Correspondingly, the terminal device receives the first information from the first cell.

[0270] It should be understood that the implementation of S302 is similar to the implementation of S1001 and S2001. Please refer to the above description and no further details will be given here.

[0271] It should be noted that the first information instructs the terminal device to send the second information to the first cell. For example, the first information includes resources of the first cell, so that the terminal device can determine to send the second information to the first cell.

[0272] S303: The terminal device obtains third information and fourth information from the first cell. Thus, based on the third information and the fourth information, the terminal device can determine that the second cell is more likely to meet the S criterion. This allows the terminal device to request system information from the second cell, allowing it to successfully camp on the second cell.

[0273] It should be understood that for the description of the third information and the fourth information, please refer to the above and will not be repeated here.

[0274] S304: When the terminal device determines that the second cell meets the first condition based on the third information and the fourth information, the terminal device sends second information to the first cell, where the second information is used to request a system message from the second cell. Correspondingly, the first cell receives the second information from the terminal device.

[0275] S305: The first cell sends a system message of the second cell to the terminal device. Correspondingly, the terminal device receives the system message of the second cell from the first cell.

[0276] The first cell sending the system message of the second cell to the terminal device can also be understood as the first cell broadcasting the system message of the second cell.

[0277] Through method 300, interaction between a terminal device and a first cell enables the first cell to send a system message from a second cell to the terminal device. This helps the terminal device obtain system messages from cells that do not periodically broadcast system messages. Furthermore, signaling between the second cell and the terminal device is reduced, thereby reducing power consumption in the second cell.

[0278] FIG4 is a flow chart of a method 400 provided in an embodiment of the present application. The method 400 is applicable to the communication system 100 and includes the following steps:

[0279] S401: A second cell sends information 1 to a first cell, where the information 1 indicates that the second cell is an NES cell. Correspondingly, the first cell receives the information 1 from the second cell.

[0280] It should be understood that the information 1 may further include one or more of the following items: a cell identifier of the second cell and / or information indicating the first parameter and / or the second parameter of the second cell, etc.

[0281] In this way, the first cell can instruct the terminal device on how to obtain the system information of the second cell. Alternatively, the first cell can indicate the first parameter and / or second parameter of the second cell to the terminal device, so that the terminal device can determine the possibility that the second cell meets the S criterion and thus determine whether to request the system information of the second cell.

[0282] Optionally, the information 1 may also be the cell identifier of the second cell and / or information indicating the first parameter and / or the second parameter of the second cell. That is, the first cell may also determine that the second cell is an NES cell based on one or both of the above.

[0283] S402: The first cell sends first information to the terminal device, where the first information is used to configure resources for second information. Correspondingly, the terminal device receives the first information from the first cell.

[0284] It should be understood that the implementation of S402 is similar to that of S1001 and S2001 , and reference may be made to the above description, which will not be repeated here.

[0285] It should be noted that the first information instructs the terminal device to send the second information to the first cell. For example, the first information includes resources of the first cell, so that the terminal device can determine to send the second information to the first cell.

[0286] S403: The terminal device obtains third information and fourth information from the first cell. Thus, based on the third information and the fourth information, the terminal device can determine that the second cell is more likely to meet the S criterion. This allows the terminal device to request system information from the second cell so that it can successfully camp on the second cell.

[0287] It should be understood that for the description of the third information and the fourth information, please refer to the above and will not be repeated here.

[0288] S404: When the terminal device determines that the second cell meets the first condition based on the third information and the fourth information, the terminal device sends second information to the first cell, where the second information is used to request a system message from the second cell. Correspondingly, the first cell receives the second information from the terminal device.

[0289] S405: The first cell sends information 2 to the second cell, where the information 2 is used to instruct the second cell to send a system message. Correspondingly, the second cell receives the information 2 from the first cell.

[0290] S406: In response to information 2, the second cell sends a system message to the terminal device. Correspondingly, the terminal device receives the system message from the second cell.

[0291] The second cell sending the system message to the terminal device may also be understood as the second cell broadcasting the system message.

[0292] Through method 400, when the terminal device determines that the second cell is more likely to meet the S criterion, the first cell can instruct the second cell to broadcast a system message, thereby facilitating the terminal device to camp on the second cell based on the system message of the second cell. This eliminates the need for the second cell to indicate its cell selection information to the first cell.

[0293] FIG5 is a flow chart of a method 500 provided in an embodiment of the present application. The method 500 is applicable to the communication system 100 and includes the following steps:

[0294] S501: A second cell sends information 1 to a first cell, where the information 1 indicates that the second cell is an NES cell. Correspondingly, the first cell receives the information 1 from the second cell.

[0295] It should be understood that the implementation of S501 is similar to that of S401 , and reference may be made to the above description, which will not be repeated here.

[0296] S502: The first cell sends first information to the terminal device, where the first information is used to configure resources for second information. Correspondingly, the terminal device receives the first information from the first cell.

[0297] It should be understood that the implementation of S502 is similar to the implementation of S1001 and S2001. Please refer to the above description and no further details will be given here.

[0298] It should be noted that, unlike the first information in S302 and S402, the first information in S502 instructs the terminal device to send the second information to the second cell. For example, the first information includes the resources of the second cell, so that the terminal device can determine to send the second information to the second cell.

[0299] S503: The terminal device obtains third information and fourth information from the first cell. Thus, based on the third information and the fourth information, the terminal device can determine that the second cell is more likely to meet the S criterion. This allows the terminal device to request system information from the second cell so that it can successfully camp on the second cell.

[0300] It should be understood that for the description of the third information and the fourth information, please refer to the above and will not be repeated here.

[0301] S504: When the terminal device determines that the second cell meets the first condition based on the third information and the fourth information, the terminal device sends second information to the second cell, where the second information is used to request a system message from the second cell. Correspondingly, the second cell receives the second information from the terminal device.

[0302] S505: In response to the second information, the second cell sends a system message to the terminal device. Correspondingly, the terminal device receives the system message from the second cell.

[0303] The second cell sending the system message to the terminal device may also be understood as the second cell broadcasting the system message.

[0304] Through method 500, when the terminal device determines that the second cell is more likely to meet the S criterion, the terminal device can directly obtain the system information of the second cell from the second cell, thereby reducing the power consumption of the first cell.

[0305] FIG6 is a flow chart of a method 600 according to an embodiment of the present application. The method 600 is applicable to the communication system 100.

[0306] Method 600 may correspond to, for example, the implementation method in methods 1000 and 2000 when the first cell and the second cell are the same cell.

[0307] The method 600 includes the following steps:

[0308] S601: A first cell sends first information to a terminal device, where the first information is used to configure resources for second information. Correspondingly, the terminal device receives the first information from the first cell.

[0309] The first cell may also be replaced by the second cell, that is, the first cell and the second cell are one cell. The first information may be carried in a public message such as an SSB of the second cell, for example.

[0310] It should be understood that the implementation of S601 is similar to the implementation of S1001 and S2001. Please refer to the above description and no further details will be given here.

[0311] S602: When the terminal device determines that the second cell meets the first condition based on the third information and the fourth information, the terminal device sends second information to the second cell, where the second information is used to request a system message from the second cell. Correspondingly, the second cell receives the second information from the terminal device.

[0312] It should be understood that in method 600, the first condition can be understood as selecting the second cell based on RSRP ranking and / or RSRQ ranking. For example, the terminal device can request system information from the cell with the highest RSRP in the RSRP ranking and / or the highest RSRQ in the RSRQ ranking. That is, the terminal device does not need to obtain the first parameter and / or second parameter of the second cell from the second cell. Therefore, if the terminal device determines that the second cell is likely to meet the S criterion based on the RSRP ranking and / or RSRQ ranking, it can request system information from the second cell.

[0313] S603: In response to the second information, the second cell sends a system message to the terminal device. Correspondingly, the terminal device receives the system message from the second cell.

[0314] The second cell sending the system message to the terminal device may also be understood as the second cell broadcasting the system message.

[0315] Through method 600 , when the terminal device determines that the second cell is more likely to meet the S criterion, the terminal device can directly obtain the system information of the second cell from the second cell.

[0316] The steps of the terminal device acquiring the third information and the fourth information in method 300, method 400 and method 500 can be implemented by the following two methods.

[0317] In the first case, the first cell sends the third information and the fourth information to the terminal device. Correspondingly, the terminal device receives the third information and the fourth information from the first cell.

[0318] The third information and the fourth information may be carried in the same system message. The implementation of this method is similar to the implementation of methods 1000 and 2000 in which the third information and the fourth information are carried in the same system message. For details, please refer to the above description and will not be repeated here.

[0319] In the second case, optionally, the third information is carried in the first system message, and the fourth information is carried in the second system message. In this case, the terminal device may send the fifth information using one of the following methods 1 to 3. These methods 1 to 3 are similar to the implementation of methods 1 to 3 in method 1000, and can be referred to the description above. The method for sending the fifth information can also be understood as the method for the terminal device to obtain the third information and the fourth information.

[0320] It should be noted that in methods 1 to 3, the fifth information is carried in message 1 or message 3. Therefore, the following first describes two processes in which the fifth information is carried in message 1 or message 3.

[0321] When the fifth information is carried in message 1, FIG7 is a flowchart of a method 700 for obtaining the third information and the fourth information by a terminal device according to an embodiment of the present application. The method 700 includes the following steps:

[0322] S701: A first cell sends third information to a terminal device, where the third information is used to indicate a first cell list. Correspondingly, the terminal device receives the third information from the first cell.

[0323] S702: In response to the third information, the terminal device sends a message 1, ie, a random access request, to the first cell, where the message 1 carries the fifth information. Correspondingly, the first cell receives the message 1 from the terminal device.

[0324] S703: In response to message 1, the first cell sends message 2, ie, a random access response, to the terminal device. Correspondingly, the terminal device receives message 2 from the first cell.

[0325] S704: In response to message 1, the first cell sends fourth information to the terminal device, where the fourth information is used to indicate the first parameter and / or second parameter of all or part of the cells. Correspondingly, the terminal device receives the fourth information from the first cell.

[0326] When the fifth information is carried in message 3, FIG8 is a flowchart of a method 800 for obtaining the third information and the fourth information by a terminal device according to an embodiment of the present application. The method 800 includes the following steps:

[0327] S801: A first cell sends third information to a terminal device, where the third information is used to indicate a first cell list. Correspondingly, the terminal device receives the third information from the first cell.

[0328] S802. In response to the third information, the terminal device sends Message 3 (i.e., an RRC system information request) to the first cell. Message 3 carries the fifth information. Correspondingly, the first cell receives Message 3 from the terminal device. Prior to S802, the terminal device sent Message 1 to the first cell, where the preamble in Message 1 was a contention preamble, and received a random access response from the first cell.

[0329] S803: In response to message 3, the first cell sends message 4, ie, a contention resolution message, to the terminal device. Correspondingly, the terminal device receives message 4 from the first cell.

[0330] S804: In response to message 3, the first cell sends fourth information to the terminal device, where the fourth information is used to indicate the first parameter and / or second parameter of all or part of the cells. Correspondingly, the terminal device receives the fourth information from the first cell.

[0331] For mode 1, in conjunction with Figure 7 , the fifth information is carried in message 1. The fifth information may be information indicating the second system message and / or information indicating all or part of the cells. The information indicating all or part of the cells includes, but is not limited to, one of the following: a cell identifier, a bitmap, or at least one preamble sequence for each cell in all or part of the cells.

[0332] For mode 2, in conjunction with Figure 8 , the fifth information is carried in message 3. The fifth information may include information indicating the second system message and / or information indicating all or some of the cells. The information indicating all or some of the cells includes, but is not limited to, a cell identifier or bitmap for each of the all or some of the cells.

[0333] It should be noted that, in Method 1 and Method 2, when the fifth information in Message 1 or Message 3 includes information for indicating the second system message, that is, the fifth information does not indicate which cell all or part of the cells are, then the first cell sends the first parameters and / or second parameters of all cells in the first cell list to the terminal device. Alternatively, when the fifth information in Message 1 or Message 3 includes information for indicating all or part of the cells, for example, the cell identifier of each cell in all or part of the cells is included in Message 1 or Message 3, the cell identifier is the first parameter and / or second parameter for indicating the cell indicated by the cell identifier in the requested second system message. The first cell can then determine that the terminal device requests the first parameter and / or second parameter of the cell indicated by the cell identifier sent in the second system message, that is, the terminal device can instruct the first cell to send the second system message without using the information for indicating the second system message.

[0334] Regarding the third method, in conjunction with FIG9 , FIG9 is a flow chart of a method 900 for obtaining third information and fourth information by a terminal device according to an embodiment of the present application. The method 900 includes the following steps:

[0335] S901: A first cell sends third information to a terminal device, where the third information is used to indicate a first cell list. Correspondingly, the terminal device receives the third information from the first cell.

[0336] S902: In response to the third information, the terminal device sends Message 1 (i.e., a random access request) to the first cell. Message 1 is used to request a second system message. Exemplarily, Message 1 carries information indicating the second system message, such as an identifier of the second system message. Correspondingly, the first cell receives Message 1 from the terminal device.

[0337] S903: In response to message 1, the first cell sends message 2, ie, a random access response, to the terminal device. Correspondingly, the terminal device receives message 2 from the first cell.

[0338] S904. In response to Message 2, the terminal device sends Message 3, i.e., an RRC system information request, to the first cell. Message 3 carries fifth information. The fifth information is used to request the fourth information. Exemplarily, the fifth information carries information indicating all or part of the cells, such as a bitmap or cell identifiers of all or part of the cells. Correspondingly, the first cell receives Message 3 from the terminal device.

[0339] S905: In response to message 3, the first cell sends message 4, ie, a contention resolution message, to the terminal device. Correspondingly, the terminal device receives message 4 from the first cell.

[0340] S906: In response to message 3, the first cell sends fourth information to the terminal device, where the fourth information is used to indicate the first parameter and / or second parameter of all or part of the cells. Correspondingly, the terminal device receives the fourth information from the first cell.

[0341] Optionally, in the above-mentioned methods 1 to 3, the information used to indicate all or part of the cells may also be information used to indicate the first parameter and / or the second parameter of all or part of the cells. That is, the fifth information may also include information used to indicate the first parameter and / or the second parameter.

[0342] It should be understood that the order of execution of the above methods does not necessarily mean the order in which they are executed. The order in which each process is executed should be determined by its function and internal logic.

[0343] The communication method of the embodiment of the present application is described in detail above in conjunction with Figures 3 to 9. The communication device of the embodiment of the present application is described in detail below in conjunction with Figures 10 and 11. The communication device includes a module or unit for executing each part of the above embodiment. The module or unit can be software, hardware, or a combination of software and hardware. The following only briefly illustrates the voice call device. For the implementation details of the solution, please refer to the description of the aforementioned method embodiment, which will not be repeated below.

[0344] FIG10 is a schematic block diagram of a communication device 1000 provided in an embodiment of the present application. As shown in FIG10 , the device 1000 includes: a receiving module 1001 and a sending module 1002 .

[0345] In one possible implementation, the apparatus 1000 is used to implement the steps corresponding to the terminal device in the above-mentioned methods 1000, 300, 400, 500, 600, 700, 800 and 900.

[0346] The receiving module 1001 is used to: receive first information from a first cell, where the first information is used to configure resources for sending second information, and the second information is used to request a system message from the second cell; the sending module 1002 is used to: send second information to the second cell or the first cell, where the second cell is a cell selected based on a first condition, and the first condition is related to the reference signal reception power and / or the reference signal reception quality.

[0347] Optionally, the first condition includes: selecting the second cell according to the reference signal reception power ranking and / or the reference signal reception quality ranking; and / or the difference between the reference signal reception power and the first parameter is greater than or equal to 0 and / or the difference between the reference signal reception quality and the second parameter is greater than or equal to 0.

[0348] Optionally, the first parameter includes a first preset threshold, or the first parameter includes one or more of the following: a minimum value of the cell signal reception level value, a first offset value, a first power or a second offset value; wherein the first offset value is an offset value of the cell signal reception level value when switching from an accessed public land mobile network to a public land mobile network with a higher priority, and the second offset value is an offset value of the cell signal reception level value for selecting the second cell within the first time period when establishing a connection with the second cell fails.

[0349] Optionally, the second parameter includes a second preset threshold, or the second parameter includes one or more of the following: a minimum value of the cell signal reception quality value, a third offset value or a fourth offset value; wherein the third offset value is an offset value of the cell signal reception quality value when switching from an accessed public land mobile network to a public land mobile network with a higher priority, and the fourth offset value is an offset value of the cell signal reception quality value of the second cell selected within the second time period when establishing a connection with the second cell fails.

[0350] Optionally, the receiving module 1001 is also used to: receive third information and fourth information from the first cell, the third information is used to indicate the first cell list, the fourth information is used to indicate the first parameters and / or second parameters of all or part of the cells in the first cell list, and the second cell belongs to all or part of the cells.

[0351] Optionally, the third information and the fourth information are carried in the same system message.

[0352] Optionally, the third information is carried in the first system message, and the fourth information is carried in the second system message.

[0353] Optionally, the receiving module 1001 is also used to: receive third information from the first cell; the sending module 1002 is also used to: send fifth information to the first cell, the fifth information is used to request fourth information or second system message; the receiving module 1001 is also used to: receive fourth information from the first cell.

[0354] Optionally, the fifth information is carried in a random access request or a radio resource control RRC request message, and the fifth information includes information for indicating the second system message and / or information for indicating all or part of the cells.

[0355] Optionally, the information used to indicate all or part of the cells satisfies any of the following conditions: when the fifth information is carried in a random access request, the information used to indicate all or part of the cells includes any one of the following: a bit map, a cell identifier of each cell in all or part of the cells, or at least one leading sequence; or, when the fifth information is carried in an RRC request message, the information used to indicate all or part of the cells includes a bit map or a cell identifier of each cell in all or part of the cells.

[0356] Optionally, the fifth information includes information for indicating all or part of the cells; the sending module 1002 is also used to: send a random access request to the first cell, the random access request is used to request a second system message; the receiving module 1001 is also used to: receive a random access response from the first cell; the sending module 1002 is also used to: based on the random access response, send an RRC request message to the first cell, the RRC request message includes the fifth information.

[0357] Optionally, the receiving module 1001 is further configured to: receive a system message from the first cell or from the second cell.

[0358] Optionally, the first cell and the second cell are the same cell; the receiving module 1001 is further used to: receive a system message from the second cell.

[0359] Optionally, the receiving module 1001 is further configured to: receive information from the first cell indicating a public land mobile network of the second cell.

[0360] In one possible implementation, the apparatus 1000 is used to implement the steps corresponding to the first cell or the second cell in the above-mentioned methods 2000, 300, 400, 500, 600, 700, 800, and 900.

[0361] The sending module 1002 is used to: send first information to the terminal device, the first information is used to configure resources for sending second information, and the second information is used to request a system message of the second cell; the receiving module 1001 is used to: receive second information from the terminal device, the second cell is a cell selected based on a first condition, and the first condition is related to the reference signal reception power and / or the reference signal reception quality.

[0362] Optionally, the first condition includes: selecting the second cell according to the reference signal reception power ranking and / or the reference signal reception quality ranking; and / or the difference between the reference signal reception power and the first parameter is greater than or equal to 0 and / or the difference between the reference signal reception quality and the second parameter is greater than or equal to 0.

[0363] Optionally, the first parameter includes a first preset threshold, or the first parameter includes one or more of the following: a minimum value of the cell signal reception level value, a first offset value, a first power or a second offset value; wherein the first offset value is an offset value of the cell signal reception level value when switching from a VPLMN to a PLMN with a higher priority, and the second offset value is an offset value of the cell signal reception level value for selecting the second cell within the first time period when establishing a connection with the second cell fails.

[0364] Optionally, the second parameter includes a second preset threshold, or the second parameter includes one or more of the following: a minimum value of the cell signal reception quality value, a third offset value or a fourth offset value; wherein the third offset value is an offset value of the cell signal reception quality value when switching from an accessed public land mobile network to a public land mobile network with a higher priority, and the fourth offset value is an offset value of the cell signal reception quality value of the second cell selected within the second time period when establishing a connection with the second cell fails.

[0365] Optionally, the sending module 1002 is also used to: send third information and fourth information to the terminal device, the third information is used to indicate the first cell list, the fourth information is used to indicate the first parameters and / or second parameters of all or part of the cells in the first cell list, and the second cell belongs to all or part of the cells.

[0366] Optionally, the third information and the fourth information are carried in the same system message.

[0367] Optionally, the third information is carried in the first system message, and the fourth information is carried in the second system message.

[0368] Optionally, the sending module 1002 is also used to: send third information to the terminal device; the receiving module 1001 is also used to: receive fifth information from the terminal device, the fifth information is used to request fourth information or second system message; the sending module 1002 is also used to: send fourth information to the terminal device.

[0369] Optionally, the fifth information is carried in a random access request or a radio resource control RRC request message, and the fifth information includes information for indicating the second system message and / or information for indicating all or part of the cells.

[0370] Optionally, the information used to indicate all or part of the cells satisfies any of the following conditions: when the fifth information is carried in a random access request, the information used to indicate all or part of the cells includes any one of the following: a bit map, a cell identifier of each cell in all or part of the cells, or at least one leading sequence; or, when the fifth information is carried in an RRC request message, the information used to indicate all or part of the cells includes a bit map or a cell identifier of each cell in all or part of the cells.

[0371] Optionally, the fifth information includes information for indicating all or part of the cells; the receiving module 1001 is also used to: receive a random access request from the terminal device, the random access request is used to request a second system message; the sending module 1002 is also used to: send a random access response to the terminal device; the receiving module 1001 is also used to: receive an RRC request message from the terminal device, the RRC request message includes the fifth information.

[0372] Optionally, the sending module 1002 is further used to: send a system message of the second cell to the terminal device or send information for instructing the second cell to send a system message to the second cell; and / or send information for indicating the public land mobile network of the second cell to the terminal device.

[0373] It should be understood that the device 1000 here is embodied in the form of a functional module. The term "module" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a proprietary processor or a group processor, etc.) and a memory for executing one or more software or firmware programs, a merging logic circuit and / or other suitable components that support the described functions. In an optional example, those skilled in the art will understand that the device 1000 may be specifically the terminal device in the above embodiment, and the device 1000 may be used to execute the various processes and / or steps corresponding to the terminal device, the first cell or the second cell in the above method embodiment. To avoid repetition, they will not be described here.

[0374] In some embodiments provided in the present application, the device 1000 in FIG. 10 may also be a chip, such as a modem processor.

[0375] Figure 11 shows a schematic block diagram of a voice communication device 1100 provided in an embodiment of the present application. Device 1100 includes a processor 1101, a transceiver 1102, and a memory 1103. Processor 1101, transceiver 1102, and memory 1103 communicate with each other via an internal connection path. Memory 1103 is configured to store instructions, and processor 1101 is configured to execute the instructions stored in memory 1103 to control transceiver 1102 to transmit and / or receive signals.

[0376] It should be understood that the apparatus 1100 can be specifically the first cell or the second cell in the above-mentioned embodiments, and can be used to execute the various steps and / or processes corresponding to the first cell or the second cell in the above-mentioned method embodiments. Optionally, the memory 1103 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory may also store device type information. The processor 1101 can be used to execute instructions stored in the memory, and when the processor 1101 executes the instructions stored in the memory, the processor 1101 is used to execute the various steps and / or processes of the above-mentioned method embodiments. The transceiver 1102 may include a transmitter and a receiver. The transmitter can be used to implement the various steps and / or processes corresponding to the above-mentioned transceiver for performing the sending action, and the receiver can be used to implement the various steps and / or processes corresponding to the above-mentioned transceiver for performing the receiving action.

[0377] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0378] During implementation, each step of the above method can be completed by an integrated logic circuit of hardware in a processor or by instructions in the form of software. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor executes the instructions in the memory, and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it will not be described in detail here.

[0379] Some embodiments of the present application provide a chip system, applied to a terminal, comprising at least one processor and an interface, the interface being configured to receive instructions and transmit them to the at least one processor; the at least one processor executing the instructions causes the terminal to execute the paging message processing method described above. The chip system may be a modem, or a system on chip (SoC) including a modem, and the method described above may be implemented by a modem.

[0380] A modem can include the NAS (non-access stratum) layer, the RRC (radio resource control) layer, the packet data convergence protocol (PDCP) layer, the radio link control protocol (RLC) layer, the medium access control layer (MAC) layer, and the physical (PHY) layer. Each of these layers can be a software module. The modem can interact with the base station through an antenna.

[0381] The present application also provides a computer-readable storage medium, which is used to store a computer program, and the computer program is used to implement the method shown in the above method embodiment.

[0382] The present application also provides a computer program product, which includes a computer program (also referred to as code or instructions). When the computer program runs on a computer, the computer can execute the method shown in the above method embodiment.

[0383] Those skilled in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope provided by the embodiments of this application.

[0384] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0385] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules is merely a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0386] The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules may be selected to achieve the purpose of the present embodiment according to actual needs.

[0387] In addition, each functional module in each embodiment of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.

[0388] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution provided by the embodiment of the present application is essentially or partly contributed to the prior art or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0389] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of changes or substitutions within the technical scope disclosed in the present application, and such changes or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: The method comprises: receiving first information from a first cell, where the first information is used to configure resources for sending second information, and the second information is used to request a system message from a second cell; The second information is sent to the second cell or the first cell, where the second cell is a cell selected according to a first condition, and the first condition is related to reference signal received power and / or reference signal received quality.

2. The method according to claim 1, characterized in that The first condition includes: selecting the second cell according to the reference signal received power ranking and / or the reference signal received quality ranking; and / or the difference between the reference signal received power and the first parameter is greater than or equal to 0 and / or the difference between the reference signal received quality and the second parameter is greater than or equal to 0.

3. The method according to claim 2, characterized in that The first parameter includes a first preset threshold, or the first parameter includes one or more of the following: a minimum value of a cell signal reception level value, a first offset value, a first power, or a second offset value; The first offset value is an offset value of the cell signal reception level value when switching from an accessed public land mobile network to a public land mobile network with a higher priority, and the second offset value is an offset value of the cell signal reception level value for selecting the second cell within a first time period when establishing a connection with the second cell fails.

4. The method according to claim 2 or 3, characterized in that The second parameter includes a second preset threshold, or the second parameter includes one or more of the following: the minimum value, the third offset value, or the fourth offset value of the cell signal reception quality value; The third offset value is an offset value of the cell signal reception quality value when switching from an accessed public land mobile network to a public land mobile network with a higher priority, and the fourth offset value is an offset value of the cell signal reception quality value of the second cell selected within the second time period when a connection with the second cell fails.

5. The method according to any one of claims 2 to 4, characterized in that The method further comprises: Receive third information and fourth information from the first cell, the third information is used to indicate a first cell list, the fourth information is used to indicate the first parameter and / or the second parameter of all or part of the cells in the first cell list, and the second cell belongs to the all or part of the cells.

6. The method according to claim 5, characterized in that The third information and the fourth information are carried in the same system message.

7. The method according to claim 5, characterized in that The third information is carried in the first system message, and the fourth information is carried in the second system message.

8. The method according to claim 7, characterized in that The method further comprises: receiving the third information from the first cell; sending fifth information to the first cell, where the fifth information is used to request the fourth information or the second system message; Receive the fourth information from the first cell.

9. The method according to claim 8, characterized in that The fifth information is carried in a random access request or a radio resource control RRC request message, and the fifth information includes information for indicating the second system message and / or information for indicating all or part of the cells.

10. The method according to claim 9, characterized in that The information used to indicate all or part of the cells meets the following conditions: In the case where the fifth information is carried in the random access request, the information used to indicate the all or part of the cells includes any one of the following: a bit map, a cell identifier of each cell in the all or part of the cells, or at least one preamble sequence; or, In the case where the fifth information is carried in the RRC request message, the information for indicating the all or part of the cells includes the bitmap or a cell identifier of each cell in the all or part of the cells.

11. The method according to any one of claims 8 to 10, characterized in that The fifth information includes information indicating all or part of the cells; The sending fifth information to the first cell includes: sending a random access request to the first cell, where the random access request is used to request the second system message; receiving a random access response from the first cell; Based on the random access response, an RRC request message is sent to the first cell, where the RRC request message includes the fifth information.

12. The method according to any one of claims 1 to 11, characterized in that The method further comprises: Receive a system message of the second cell from the first cell or from the second cell.

13. The method according to claim 1, wherein The first cell and the second cell are the same cell; The method further comprises: Receive a system message from the second cell.

14. The method according to any one of claims 1 to 13, characterized in that The method further comprises: Information indicating a public land mobile network of the second cell is received from the first cell.

15. A communication method, characterized in that: The method comprises: Sending first information to a terminal device, where the first information is used to configure resources for sending second information, and the second information is used to request a system message of a second cell; The second information is received from the terminal device, where the second cell is a cell selected based on a first condition, and the first condition is related to a reference signal received power and / or a reference signal received quality.

16. The method according to claim 15, characterized in that The first condition includes: selecting the second cell according to the reference signal received power ranking and / or the reference signal received quality ranking; and / or the difference between the reference signal received power and the first parameter is greater than or equal to 0 and / or the difference between the reference signal received quality and the second parameter is greater than or equal to 0.

17. The method according to claim 16, characterized in that The first parameter includes a first preset threshold, or the first parameter includes one or more of the following: a minimum value of a cell signal reception level value, a first offset value, a first power, or a second offset value; The first offset value is an offset value of the cell signal reception level value when switching from an accessed public land mobile network to a public land mobile network with a higher priority, and the second offset value is an offset value of the cell signal reception level value for selecting the second cell within a first time period when establishing a connection with the second cell fails.

18. The method according to claim 16 or 17, characterized in that The second parameter includes a second preset threshold, or the second parameter includes one or more of the following: a minimum value of the cell signal reception quality value, a third offset value, or a fourth offset value; The third offset value is an offset value of the cell signal reception quality value when switching from an accessed public land mobile network to a public land mobile network with a higher priority, and the fourth offset value is an offset value of the cell signal reception quality value of the second cell selected within the second time period when a connection with the second cell fails.

19. The method according to any one of claims 16 to 18, characterized in that The method further comprises: Send third information and fourth information to the terminal device, the third information is used to indicate the first cell list, the fourth information is used to indicate the first parameter and / or the second parameter of all or part of the cells in the first cell list, and the second cell belongs to the all or part of the cells.

20. The method according to claim 19, characterized in that The third information and the fourth information are carried in the same system message.

21. The method according to claim 19, wherein The third information is carried in the first system message, and the fourth information is carried in the second system message.

22. The method according to claim 21, characterized in that The method further comprises: sending the third information to the terminal device; receiving fifth information from the terminal device, where the fifth information is used to request the fourth information or the second system message; Send the fourth information to the terminal device.

23. The method according to claim 22, characterized in that The fifth information satisfies any of the following: The fifth information is carried in a random access request or a radio resource control RRC request message, and the fifth information includes information for indicating the second system message and / or information for indicating all or part of the cells.

24. The method according to claim 23, wherein The information used to indicate all or part of the cells meets the following conditions: In the case where the fifth information is carried in the random access request, the information used to indicate the all or part of the cells includes any one of the following: a bit map, a cell identifier of each cell in the all or part of the cells, or at least one preamble sequence; or, In the case where the fifth information is carried in the RRC request message, the information for indicating the all or part of the cells includes the bitmap or a cell identifier of each cell in the all or part of the cells.

25. The method according to any one of claims 22 to 24, characterized in that The fifth information includes information indicating all or part of the cells; The receiving fifth information from the terminal device includes: receiving a random access request from the terminal device, where the random access request is used to request the second system message; Sending a random access response to the terminal device; Receive an RRC request message from the terminal device, where the RRC request message includes the fifth information.

26. The method according to any one of claims 15 to 25, characterized in that The method further comprises: Sending a system message of the second cell to the terminal device or sending information for instructing the second cell to send the system message to the second cell; and / or, Information indicating the public land mobile network of the second cell is sent to the terminal device.

27. A communication device, characterized in that: Comprising means for performing the method of any one of claims 1 to 14, or any one of claims 15 to 26.

28. A communication device, characterized in that: include: A processor, the processor being coupled to a memory, the memory being used to store a computer program, wherein when the processor calls the computer program, the device is caused to execute the method according to any one of claims 1 to 14 or any one of claims 15 to 26.

29. A computer-readable storage medium, characterized in that Used to store a computer program, the computer program comprising instructions for implementing the method according to any one of claims 1 to 14 or any one of claims 15 to 26.

30. A computer program product, characterized in that The computer program product includes computer program code, and when the computer program code is run on a computer, the computer is enabled to implement the method according to any one of claims 1 to 14 or any one of claims 15 to 26.

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