WO2022237408A1

WO2022237408A1 - Cell selection method and communication apparatus

Info

Publication number: WO2022237408A1
Application number: PCT/CN2022/085709
Authority: WO
Inventors: 齐先婷; 代贝; 胡浩; 陈小艳; 张号
Original assignee: 华为技术有限公司
Priority date: 2021-05-14
Filing date: 2022-04-08
Publication date: 2022-11-17
Also published as: CN115348623A

Abstract

The present application provides a cell selection method and a communication apparatus, the method comprising: a terminal device measures the signal quality of a cell in a first cell set, and determines that the first cell is the optimal cell for cell reselection, the first cell set being a set of candidate cells for the terminal device to perform cell reselection, and the first cell set comprising the first cell; and if a first network to which the first cell belongs is not a peer-to-peer network of a second network, the terminal device determines a target cell for cell reselection in a cell other than the first cell in the first cell set, the second network being the network to which a second cell in which the terminal device resides belongs. The present invention is expected to improve the communication quality of a terminal device.

Description

Cell selection method and communication device

This application claims the priority of the Chinese patent application with the application number 202110527251.5 and the application name "Cell Selection Method and Communication Device" submitted to the China Patent Office on May 14, 2021, the entire contents of which are incorporated by reference in this application.

technical field

The present application relates to the communication field, and more specifically, relates to a cell selection method and a communication device.

Background technique

In the fifth generation ( ^5th generation, 5G) mobile communication technology, a non-stand alone (NSA) deployment scheme is proposed. NSA refers to the 5G base station providing wireless access services for user equipment (UE). , needs the infrastructure of the fourth generation ( ^4th generation, 4G) network. For example, in the NSA 3x option (option 3x) networking mode, the 5G base station does not have independent networking, and needs to be attached to the LTE base station for dual-connection networking, and the user equipment (user equipment, UE) accesses the 4G cell as the anchor cell Afterwards, the network adds a 5G secondary cell group (SCG), so that the UE maintains dual connections with the 4G base station and the 5G base station at the same time, and uses the radio resources of the two base stations for service transmission.

The multi-operator core network (MOCN) technology can enable multiple operators to share the same wireless network, so that a set of wireless networks can be connected to the core network nodes of multiple operators at the same time. Multiple operators can jointly build NSA anchor cells through MOCN technology, so that multiple operators can share the same wireless network and improve resource utilization. The MOCN cell can broadcast identification information of public land mobile networks (public land mobile network, PLMN) of at least two operators through a broadcast message, so that UEs served by the networks of the at least two operators can all access the MOCN cell.

However, with the application of the MOCN technology in the system, the cell selection method of the UE needs to be improved adaptively.

Contents of the invention

Embodiments of the present application provide a cell selection method and a communication device, in order to improve the communication quality of terminal equipment.

In a first aspect, a communication method is provided, and the method may be executed by a terminal device or a module (such as a chip) configured on (or used for) the terminal device.

The method includes: the terminal device measures the signal quality of the cells in the first cell set, and determines that the first cell is the optimal cell for cell reselection, and the first cell set is a set of candidate cells for the terminal device to perform cell reselection , the first set of cells includes the first cell; if the first network to which the first cell belongs is not a peer-to-peer network of the second network, the terminal device is in a cell other than the first cell in the first set of cells, A target cell for cell reselection is determined, and the second network is a network to which the second cell where the terminal equipment resides belongs.

According to the solution of this application, the terminal device only removes the searched cell that does not belong to the EPLMN of the network where the UE resides out of the reselection candidate cell list, so that the UE can avoid finding the cell that does not belong to the EPLMN in the next search, and also Have the opportunity to access the anchor cell to use 5G services. In order to improve the communication quality of the terminal equipment.

With reference to the first aspect, in some implementation manners of the first aspect, the method further includes: the terminal device receives a first message from the first cell, where the first message includes network identification information, and the network identification information is used to indicate The first cell belongs to the first network.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: the terminal device searches for at least one frequency point, and determines a second set of cells working on the at least one frequency point; The first cell set is obtained by excluding the cells included in the third cell set from the second cell set, where the third cell set includes at least one cell that the terminal device is prohibited from selecting.

With reference to the first aspect, in some implementation manners of the first aspect, the method further includes: the terminal device acquires forbidden cell information; the terminal device determines the third set of cells according to the forbidden cell information, wherein the forbidden cell The information includes identification information of each cell in the third set of cells.

With reference to the first aspect, in some implementation manners of the first aspect, the forbidden cell information further includes frequency point information and/or frequency band information of each cell in the third cell set.

With reference to the first aspect, in some implementations of the first aspect, the method further includes: if the first network is not a peer-to-peer network of the second network, the terminal device records the information of the first cell in the prohibited In the cell information, the information of the first cell includes identification information of the first cell.

With reference to the first aspect, in some implementation manners of the first aspect, the forbidden cell information is specifically information about forbidden cells corresponding to the home network of the terminal device.

With reference to the first aspect, in some implementation manners of the first aspect, the method further includes: the terminal device receives a second message from the second cell, the second message includes frequency point information of neighboring cells, and the frequency point information of the neighboring cell The point information is used to indicate the at least one frequency point.

With reference to the first aspect, in some implementation manners of the first aspect, the terminal device is in an idle state.

With reference to the first aspect, in some implementation manners of the first aspect, the first network and/or the second network are public land mobile networks.

The second aspect provides a communication device. In one design, the device may include a one-to-one corresponding module for executing the method/operation/step/action described in the first aspect. The module may be a hardware circuit or However, software may also be realized by combining hardware circuits with software. In one design, the device includes: a transceiver unit, configured to receive signals from cells in the first set of cells, and a processing unit, configured to measure the signal quality of the cells in the first set of cells, and determine that the first cell is a cell heavy The optimal cell selected, the first set of cells is a set of candidate cells for terminal equipment to perform cell reselection, and the first set of cells includes the first cell; In the case that the network is not a peer-to-peer network of the second network, in the cells other than the first cell in the first cell set, determine the target cell for cell reselection, and the second network is the second cell where the terminal equipment resides. The network to which the cell belongs.

With reference to the second aspect, in some implementations of the second aspect, the transceiver unit is further configured to receive a first message from the first cell, where the first message includes network identification information, and the network identification information is used to indicate that the second A cell belongs to the first network.

With reference to the second aspect, in some implementations of the second aspect, the transceiver unit is further configured to search for at least one frequency point, and determine a second set of cells working on the at least one frequency point; the processing unit is also configured to The first cell set is obtained by excluding the cells included in the third cell set from the second cell set, where the third cell set includes at least one cell that is prohibited from being selected by the terminal device.

With reference to the second aspect, in some implementation manners of the second aspect, the processing unit is also used for:

Obtain the forbidden area information;

determining the third set of cells according to the forbidden cell information,

Wherein, the prohibited cell information includes identification information of each cell in the third cell set.

With reference to the second aspect, in some implementation manners of the second aspect, the forbidden cell information further includes frequency point information and/or frequency band information of each cell in the third cell set.

With reference to the second aspect, in some implementation manners of the second aspect, the processing unit is further configured to record the information of the first cell in the In the prohibited cell information, the information of the first cell includes identification information of the first cell.

With reference to the second aspect, in some implementation manners of the second aspect, the forbidden cell information is specifically information about forbidden cells corresponding to the home network of the terminal device.

With reference to the second aspect, in some implementations of the second aspect, the transceiver unit is further configured to receive a second message from the second cell, where the second message includes frequency point information of neighboring cells, and the frequency point information of neighboring cells used to indicate the at least one frequency point.

With reference to the second aspect, in some implementation manners of the second aspect, the terminal device is in an idle state.

With reference to the second aspect, in some implementation manners of the second aspect, the first network and/or the second network are public land mobile networks.

In a third aspect, a communication device is provided, including a processor. The processor may implement the first aspect and the method in any possible implementation manner of the first aspect. Optionally, the communication device further includes a memory, and the processor is coupled to the memory, and can be used to execute instructions in the memory, so as to implement the above first aspect and the method in any possible implementation manner of the first aspect. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

In an implementation manner, the communication device is a terminal device. When the communication device is a terminal device, the communication interface may be a transceiver, or an input/output interface.

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

Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In a fourth aspect, a processor is provided, including: 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 in the first aspect and any possible implementation manner of the first aspect.

In the specific implementation process, the above-mentioned processor can be one or more chips, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, a gate circuit, a flip-flop and various logic circuits, etc. . The input signal received by the input circuit may be received and input by, for example but not limited to, the receiver, the output signal of the output circuit may be, for example but not limited to, output to the transmitter and transmitted by the transmitter, and the input circuit and the output The circuit may be the same circuit, which is used as an input circuit and an output circuit respectively at different times. The embodiment of the present application does not limit the specific implementation manners of the processor and various circuits.

In a fifth aspect, a computer program product is provided, and the computer program product includes: a computer program (also referred to as code, or an instruction), when the computer program is executed, the computer executes the above-mentioned first aspect and the first aspect A method in any of the possible implementations.

In a sixth aspect, a computer-readable storage medium is provided, and the computer-readable storage medium stores a computer program (also referred to as code, or instruction) when it is run on a computer, so that the computer executes the above-mentioned first aspect and The method in any possible implementation manner in the first aspect.

According to a seventh aspect, a communication system is provided, including the foregoing at least one terminal device, a network device for managing a first cell, and a network device for managing a second cell.

Description of drawings

FIG. 1 is a schematic diagram of a communication system provided by an embodiment of the present application;

Fig. 2 is a schematic diagram of the MOCN cell provided by the embodiment of the present application;

FIG. 3 is a schematic diagram of cell selection performed by a terminal device provided in an embodiment of the present application;

Fig. 4 is a schematic flowchart of the cell selection method provided by the present application;

FIG. 5 is a schematic flowchart of a cell selection method provided by an embodiment of the present application;

FIG. 6 is another schematic flow chart of a cell selection method provided by an embodiment of the present application;

Fig. 7 is a schematic block diagram of an example of a communication device provided by an embodiment of the present application;

FIG. 8 is a schematic structural diagram of an example of a terminal device provided in an embodiment of the present application;

FIG. 9 is a schematic structural diagram of an example of a network device provided by an embodiment of the present application.

Detailed ways

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

The technical solution of the embodiment of the present application can be applied to various communication systems, for example: long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex) , TDD), the fifth generation (5th generation, 5G) communication system, the future communication system (such as the sixth generation (6th generation, 6G) communication system), or a system where multiple communication systems are integrated, etc., the embodiments of the present application do not Do limited. Among them, 5G can also be called new radio (new radio, NR).

The technical solution provided by the embodiment of the present application can be applied to various communication scenarios, for example, it can be applied to one or more of the following communication scenarios: eMBB communication, URLLC, machine type communication (machine type communication, MTC), mMTC, device Device-to-device (D2D) communication, vehicle to everything (V2X) communication, vehicle to vehicle (V2V) communication, vehicle to Internet (vehicle to network, V2N), vehicle to Infrastructure (vehicle to infrastructure, V2I), vehicle to pedestrian (vehicle to pedestrian, V2P), and internet of things (IoT), etc. Optionally, mMTC may include one or more of the following communications: communications in industrial wireless sensor or network (IWSN), communications in video surveillance (video surveillance) scenarios, and communications in wearable devices Wait.

The technical solutions provided by the embodiments of the present application may be applied to communication between communication devices. The communication between communication devices may include: communication between a network device and a terminal device, communication between a network device and a network device, and/or communication between a terminal device and a terminal device. In this embodiment of the present application, the term "communication" may also be described as "transmission", "information transmission", or "signal transmission", etc. Transmission may include sending and/or receiving. The technical solution of the embodiment of the present application is described by taking the communication between the network device and the terminal device as an example. Those skilled in the art can also use the technical solution for communication between other scheduling entities and subordinate entities, such as the communication between the macro base station and the micro base station. The communication between, for example, the communication between the first terminal device and the second terminal device. Wherein, the scheduling entity may allocate wireless resources, such as air interface resources, to the dependent entity. The air interface resources include one or more of the following resources: time domain resources, frequency domain resources, code resources and space resources.

In this embodiment of the present application, the communication between the network device and the terminal device includes: the network device sends a downlink signal to the terminal device, and/or the terminal device sends an uplink signal to the network device. Wherein, the signal may also be replaced by information or data.

The terminal device involved in this embodiment of the present application may also be referred to as a terminal. A terminal may be a device with a wireless transceiver function. Terminals can be deployed on land, including indoors, outdoors, hand-held, and/or vehicle-mounted; they can also be deployed on water (such as ships, etc.); and they can also be deployed in the air (such as on aircraft, balloons, and satellites, etc.). The terminal device may be user equipment (user equipment, UE). UEs include handheld devices, vehicle-mounted devices, wearable devices, or computing devices with wireless communication capabilities. Exemplarily, the UE may be a mobile phone (mobile phone), a tablet computer or a computer with a wireless transceiver function. The terminal device can also be a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a smart A wireless terminal in a power grid, a wireless terminal in a smart city (smart city), and/or a wireless terminal in a smart home (smart home), etc.

The network device involved in the embodiment of the present application includes a base station (base station, BS), which may be a device deployed in a wireless access network and capable of performing wireless communication with a terminal device. A base station may come in various forms, such as a macro base station, a micro base station, a relay station, or an access point. The base station involved in this embodiment of the present application may be a base station in a 5G system, a base station in an LTE system, or a base station in another system, without limitation. Among them, the base station in the 5G system can also be called a transmission reception point (transmission reception point, TRP) or a next-generation node B (generation Node B, gNB or gNodeB). Wherein, the base station may be an integrated base station, or may be a base station separated into multiple network elements, without limitation. For example, the base station is a base station in which a centralized unit (CU) and a distributed unit (DU) are separated, that is, the base station includes a CU and a DU.

In the embodiment of the present application, the device for realizing the function of the terminal device may be a terminal device; it may also be a device capable of supporting the terminal device to realize the function, such as a chip system. The device can be installed in the terminal equipment or matched with the terminal equipment. In the embodiment of the present application, the system-on-a-chip may be composed of chips, or may include chips and other discrete devices. In the technical solutions provided in the embodiments of the present application, the technical solutions provided in the embodiments of the present application will be described by taking the terminal device as an example for realizing the functions of the terminal device.

In the embodiment of the present application, the device for realizing the function of the network device may be a network device; it may also be a device capable of supporting the network device to realize the function, such as a chip system. The device can be installed in the network equipment or matched with the network equipment. In the technical solution provided by the embodiment of the present application, the technical solution provided by the embodiment of the present application is described by taking the network device as an example for realizing the function of the network device.

In the embodiment of this application, "/" can indicate that the objects associated before and after are in an "or" relationship, for example, A/B can indicate A or B; "and/or" can be used to describe that there are three types of associated objects A relationship, for example, A and/or B, may mean: A exists alone, A and B exist simultaneously, and B exists independently, where A and B may be singular or plural. In order to facilitate the description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" may be used to distinguish technical features with the same or similar functions. The words "first" and "second" do not limit the number and execution order, and the words "first" and "second" do not necessarily mean that they must be different. In the embodiments of this application, words such as "exemplary" or "for example" are used to represent examples, illustrations or illustrations, and any embodiment or design described as "exemplary" or "for example" should not be interpreted It is more preferred or more advantageous than other embodiments or design solutions. The use of words such as "exemplary" or "for example" is intended to present related concepts in a specific manner for easy understanding.

In the embodiment of the present application, at least one (species) can also be described as one (species) or multiple (species), multiple (species) can be two (species), three (species), four (species) ) or more (species), this application does not limit.

FIG. 1 is a schematic diagram of a communication system 100 applicable to an embodiment of the present application.

As shown in FIG. 1 , the communication system 100 may include at least one network device, such as the network device 130 and the network device 140 shown in FIG. 1 . The communication system 100 may further include at least one terminal device, such as the terminal device 110 and the terminal device 120 shown in FIG. 1 .

In the communication system shown in Figure 1 or Figure 2, a network device can manage at least one cell, and a terminal device can communicate with the network by accessing a cell managed by the network device. The cell (namely the source cell) is handed over to another cell (namely the target cell). The source cell and the target cell may be cells managed by the same network device, or cells managed by different network devices.

In actual deployment, there may be a networking scenario where non-MOCN cells and MOCN cells coexist on the same frequency point. Taking Figure 2 as an example, the identifier of the PLMN of operator B is xxxxx. Before operator B carries out the MOCN technology application transformation of the base station, cell 2 and cell 3 exist on frequency point B at the same time. Operator A and operator B can apply MOCN technology to transform the base station, so that after the base station transformation, cell 3 becomes an NSA anchor cell jointly built by the two operators. Cell 3 may broadcast the identifier xxxxx of the PLMN of operator B and the identifier yyyyy of the PLMN of operator A through a broadcast message. So that the terminal devices served by the two networks can access the cell. as shown in picture 2. After the base station is transformed using MOCN technology, there are non-MOCN cells exclusively for operator B (ie, cell 2) and MOCN cells shared by operator A and operator B (ie, cell 3) on frequency point B.

It should be noted that, FIG. 2 illustrates an example in which two operators, operator A and operator B, jointly build an MOCN cell. In actual deployment, multiple operators may jointly build one MOCN cell. The broadcast message of the MOCN cell can broadcast the identification information of the PLMNs of the multiple operators. For example, the broadcast message supporting one MOCN cell can broadcast the identification information of up to 6 PLMNs, but this application is not limited thereto. In future deployment, MOCN The cell can also support the broadcast of identification information of more PLMNs.

In the scenario shown in Figure 3, assuming that the UE's contracted network is the PLMN network of operator A, the specific process for the UE to perform cell selection can be shown in Figure 4, which may include but not limited to the following steps:

1. The UE is turned on;

2. The UE chooses to camp on the serving cell and is in the IDLE state;

For example, after the UE is powered on, it selects to camp on cell 1 in the network of operator A as shown in FIG. 3 , and the UE uses the cell 1 as a serving cell.

3. The UE searches for a cell on at least one frequency point and measures the cell.

When the UE is in the IDLE state, it can search for cells on at least one frequency point and measure the signal quality of the searched adjacent cells, so as to select a cell with the best or better signal quality to access and camp on.

Optionally, the UE may search for cells on at least one frequency point and perform measurement on the searched cells when the measurement condition is satisfied. However, the present application is not limited thereto, and the UE may also perform step 3 under other conditions for entering the network connection state.

As an example without limitation, the measurement condition may be specified by a protocol or preconfigured by the network.

For example, if the cell reselection frequency indicated by the system message of cell 1 includes frequency B. After the UE determines that the measurement condition is met, the UE initiates measurement on the frequency point B. The measurement process includes that the UE searches for cells existing on frequency point B, and then performs measurement reselection evaluation on the searched cells.

4. The UE determines the best candidate cell.

For example, the UE finds cell 2 and cell 3 on frequency B at the same time during the search process, and determines that the best candidate cell is cell 2 in operator B's network after measurement reselection evaluation.

5. The UE searches for the best candidate cell and receives the system information of the best candidate cell.

For example, after determining that the optimal candidate cell is cell 2, the UE searches for the optimal candidate cell and receives the system information of the cell 2.

6. The UE judges whether the network of the optimal candidate cell is the EPLMN of the network of the cell currently camped on.

The system message of cell 2 received by the UE includes the identification information of the PLMN to which the cell 2 belongs, and the UE can determine whether the PLMN to which the cell 2 belongs is the equivalent PLMN (equivalent PLMN) of the PLMN of the cell currently camped on according to the identification information of the PLMN. , EPLMN).

7. If the network of the optimal candidate cell is not the EPLMN of the network where the cell currently resides, all cells on the frequency point where the cell is located will be removed from the reselection candidate cell list for up to 5 minutes.

Based on the provisions of the 3rd generation partnership project ( ^3rd generation partnership project, 3GPP) standard protocol 36.304, when the UE performs cell reselection, if the network of the optimal candidate cell is not the peer PLMN (equivalent PLMN) of the current network where it resides, EPLMN), the UE needs to remove all cells on the frequency point from the list of candidate cells for cell reselection, and the removal time can last up to 5 minutes. For example, in a common non-roaming scenario, when the network of the optimal candidate cell is not the home PLMN (home PLMN, HPLMN), peer home PLMN (equivalent home PLMN, EHPLMN) or EPLMN of the current resident network, or, In a roaming scenario, if the network of the optimal candidate cell is not the EPLMN of the current network where the UE resides, the UE shall remove all cells on the frequency from the list of candidate cells for cell reselection.

In the example shown in Figure 3, the optimal candidate cell determined by the UE is cell 2 belonging to the network of operator B. Since the network of cell 2 is not the EPLMN of the network where the UE is currently camped on, following the above standard, the UE will Cell 2 and cell 3 on frequency point B are removed from the reselection candidate cell list at the same time.

8. The UE continues to perform cell reselection and measurement at other frequency points.

9. If the network of the optimal candidate cell is the EPLMN of the network of the cell currently camped on, it is judged that other parameters of the cell meet the camping conditions.

10. The UE initiates cell reselection to the optimal candidate cell, and camps on the target cell.

In the example shown in Figure 3, the optimal candidate cell determined by the UE is cell 2 belonging to the network of operator B. Since the network of cell 2 is not the EPLMN of the network where the UE is currently camped on, following the above standard, the UE will Cell 2 and cell 3 on frequency point B are removed from the reselection candidate cell list at the same time. This causes the UE to be unable to initiate reselection to the MOCN cell shared by operator A and operator B within a certain period of time, which affects the use of 5G services by the UE through the anchor cell. This makes the co-constructed MOCN community unable to achieve the desired effect.

According to the above cell selection process, since the network of cell 2 is not the EPLMN of the UE's current network, the UE simultaneously removes cell 2 and cell 3 on the frequency point B corresponding to cell 2 from the reselection candidate cell list. The UE cannot initiate reselection to the MOCN cell (that is, cell 3 ) shared by operator A and operator B within a certain period of time. This makes it impossible for the UE to use 5G services through the NSA anchor cell (that is, cell 3), which fails to achieve the expected effect of co-constructing MOCN cells and affects user experience. To solve this problem, this application proposes that if the UE only removes the searched cell that does not belong to the EPLMN of the network where the UE resides from the reselection candidate cell list, the UE will be able to avoid searching for the cell that does not belong to the EPLMN after the next search. , and have the opportunity to access the anchor cell to use 5G services.

The cell selection method provided by the embodiment of the present application will be described below with reference to the accompanying drawings.

It should be noted that the cell selection method provided by the embodiment of the present application can be applied to the terminal device to perform cell reselection, and can also be applied to the first cell selection after the terminal device is turned on, which is not limited in this application.

Fig. 5 is a schematic flowchart of a cell selection method provided by an embodiment of the present application. The cell selection method shown in FIG. 5 can be executed by a terminal device.

S501. The terminal device measures the signal quality of the cells in the first cell set, and determines that the first cell in the first cell set is an optimal cell for cell reselection.

Wherein, the first set of cells is a set of candidate cells for which the terminal device performs cell reselection. For example, the terminal device is currently camping on the second cell, and the terminal device is in an idle (IDLE) state, and the terminal device can measure the signal quality of the cells in the first cell set if the measurement condition for cell reselection is satisfied. The terminal device evaluates the cells in the first cell set according to the measurement results, and determines the optimal cell for cell reselection in the first cell set, that is, the first cell.

As an example without limitation, the signal quality of a cell may include one or more of the following:

Reference signal receiving power (reference signal receiving power, RSRP), reference signal receiving quality (reference signal receiving quality, RSRQ), received signal strength indication (received signal strength indication, RSSI) or signal to interference plus noise ratio (signal to interference plus noise ratio, SINR).

For example, it may be specified that the signal quality of a cell is RSRP, and the terminal device may receive a reference signal of a cell in the first set of cells, where the reference signal may be a channel state information-reference signal (channel state information-reference signal, CSI-RS) or a synchronous signal (synchronization signal, SS), and measure the received CSI-RS or RSPP of SS, and then perform the measurement results, and use the cell with better signal quality as the optimal cell for cell reselection, but the application is not limited thereto . The terminal device may also refer to other information of the cell to determine the optimal cell for cell reselection.

Optionally, the terminal device may search for at least one frequency point, and determine the second set of cells working on the at least one frequency point.

For example, the terminal device may receive a second message from the second cell, where the second message includes frequency point information of neighboring cells, where the frequency point information of neighboring cells is used to indicate at least one frequency point. When the terminal device determines that the measurement condition for cell reselection is satisfied, the terminal device may perform cell search on the at least one frequency point, and the at least one cell searched by the terminal device on the at least one frequency point is the second set of cells.

After the terminal device obtains the second set of cells through searching, the terminal device acquires a third set of cells, where the third set of cells includes at least one cell that the terminal device is prohibited from selecting. After excluding the third set of cells from the second set of cells, the terminal device obtains the first set of cells to be measured.

That is to say, the terminal device obtains the first set of cells after excluding cells that are prohibited from being selected in the searched second set of cells, and the terminal device measures and evaluates the cells in the first set of cells to determine the first set of cells. The optimal cell for medium cell reselection, that is, the first cell.

Optionally, the terminal device acquires forbidden cell information, and determines the third set of cells according to the forbidden cell information. The forbidden cell information includes identification information of each cell in the third cell set.

For example, the terminal device stores prohibited cell information, the prohibited cell information includes information about cells that the terminal device is prohibited from selecting, including a physical cell identifier (PCI) of each cell that is prohibited from being selected by the terminal device. Before performing measurement, the terminal device reads the forbidden cell information, and determines a set of forbidden cells of the terminal device, that is, a third set of cells, according to the PCI included in the forbidden cell information.

Optionally, the forbidden cell information further includes frequency point information and/or frequency band information corresponding to each PCI. The frequency point information is used to indicate the working frequency point of the corresponding cell, and the frequency band information is used to indicate the working frequency band of the corresponding cell.

For example, the forbidden cell information may be a list, and each row or column of the list corresponds to PCI, frequency band information, and frequency point information of a cell, but the present application is not limited thereto.

As an example without limitation, the prohibited cell information is the prohibited cell information corresponding to the home network of the terminal device.

Wherein, the home network of the terminal device may be HPLMN, but the present application is not limited thereto.

S502. If the first network to which the first cell belongs is not a peer-to-peer network of the second network, determine a target cell for cell reselection among cells other than the first cell in the first cell set, and the second network is the cell where the terminal equipment resides. The network to which the remaining second cell belongs.

After the terminal device determines that the first cell is the optimal cell for cell reselection in S501, the terminal device may perform a cell search on the first cell, for example, the terminal device detects a synchronization signal of the first cell, and uses the synchronization signal to communicate with the After the cells are synchronized, a first message from the first cell is received, where the first message includes network identification information, and the network identification information is used to indicate that the first cell belongs to the first network. The terminal device determines, according to the network identification information, that the first cell belongs to the first network.

As an example without limitation, the network identification information is a PLMN identification.

The network may preconfigure the peer-to-peer network of the second network for the terminal device, and the terminal device may determine whether the first network is the peer-to-peer network of the second network according to the pre-configured information, and if the first network is not the peer-to-peer network of the second network and other networks, the terminal device excludes the first cell from the first cell set, and evaluates the target cell for cell reselection among the remaining cells in the first cell set.

For example, in a common non-roaming scenario, when the first network is not the HPLMN, EHPLMN or EPLMN of the second network, or, in a roaming scenario, when the first network is not the EPLMN of the second network, the terminal device gathers in the first cell The first cell is excluded from the first cell set, and the target cell for cell reselection is evaluated among the remaining cells in the first cell set.

Exemplarily, when the cell selection method provided in this embodiment is applied in the scenario shown in FIG. 3 , the UE selects cell 1 that resides in the network of operator A after powering on, and uses the cell 1 as a serving cell. After the UE determines that the measurement condition is satisfied, the UE searches for cells on the frequency point B according to the system information of the cell 1 to obtain a second cell set, and the second cell set includes at least cell 2 and cell 3 . The UE reads the forbidden cell information to obtain the third set of cells, and excludes the cells included in the third set of cells from the second set of cells. For example, both the third set of cells and the second set of cells include cell 4. Cell 4 is deleted from the set. Perform measurement and evaluation on cells other than cell 4 in the second set of cells.

After measurement and evaluation, the UE determines that the best candidate cell is cell 2 in the network of operator B. However, according to the system information of cell 2, it is determined that the PLMN to which cell 2 belongs (that is, the PLMN identified as xxxxx) is not the EPLMN of cell 1, then the UE records the information of cell 2 in the forbidden cell information, and performs cell reselection for the remaining cells. At this time, since cell 3 is not prohibited from being selected, the UE can select cell 3 after measurement. Since cell 3 is an anchor cell co-built by operators A and B, the UE can use cell 3 as an anchor point to use 5G services. But the present application is not limited thereto.

According to this embodiment, when the terminal device detects that the network to which a selected cell belongs is not the peer-to-peer network of the resident network, it only excludes this cell and then evaluates the target cell for cell reselection among other remaining cells, which can avoid Point cells are excluded, which increases the probability of terminal equipment accessing anchor cells to use 5G services.

Optionally, after the terminal device determines that the first network to which the first cell belongs is not a peer-to-peer network of the second network, the terminal device records the information of the first cell in the cell selection prohibited information. The information of the first cell includes identification information of the first cell.

For example, the terminal device records the PCI of the first cell in the prohibited cell selection information as the prohibited cell corresponding to the HPLMN of the terminal device, that is, the first cell is added to the third cell set, so that the terminal device will perform cell selection next time. After the search, the third set of cells (that is, the forbidden cells corresponding to the HPLMN of the terminal device) can be excluded from the searched cells, and then the remaining cells can be measured and evaluated. Unnecessary power consumption of terminal equipment is reduced.

If the first network is a peer-to-peer network of the second network, the terminal device can judge whether other parameters of the first cell meet the residency condition, and if the residency condition is met, the terminal device initiates a cell re-start to the first cell. selected, camp on the first cell.

The terminal device keeps the stored information about the forbidden cell selection, and when camping in the first cell, after satisfying the measurement conditions for cell reselection, the terminal device can also exclude the cell indicated by the selection forbidden information from the searched cells (that is, the second Three cells set), and then measure and evaluate the remaining cells. When a cell that does not belong to the peer-to-peer network of the cell where the cell resides is detected again, the cell is recorded in the prohibition selection information for next cell reselection.

It should be noted that the above-mentioned terminal device receiving a message from a cell may be that the terminal device receives the message from the network device managing the cell, that is, the network device managing the cell sends a message related to the cell, and the terminal device Correspondingly receive relevant information of the cell. For example, the above-mentioned terminal device receives the first message from the first cell. Specifically, the network device that manages the first cell may send the first message, and the terminal device receives the first message from the network device. The above-mentioned terminal device receives the second message from the second cell. Specifically, the network device managing the second cell may send the second message, and the terminal device receives the second message from the network device.

FIG. 6 is a schematic flow chart of a cell selection method 600 provided by an embodiment of the present application. The cell selection method 600 may be performed by a terminal device, and the method is performed by a UE as an example for description below. The cell selection method 600 may include but not limited to the following steps:

S601. The UE is powered on.

S602, the UE chooses to camp on a serving cell and is in an IDLE state.

S603, the UE searches for cells on at least one frequency point, and determines a cell set A (that is, an example of a second cell set).

Before this S603, the UE may receive a system message from the network device in the serving cell (that is, the cell where it currently resides), and the system message includes indication information A (that is, an example of frequency point information of adjacent cells), and the indication information A uses Indicates at least one frequency point for cell reselection measurement. The UE may perform cell search on the at least one frequency point according to the indication information A, and determine the cell set A. The cell set A includes the cells searched by the UE and working on the at least one frequency point. The UE can acquire the PCI information of the cells in the cell set A by searching.

For example, the UE can detect the synchronization signal of the cell during the cell search process. For example, in the NR system, the UE can detect the synchronization signal of a cell and the physical broadcast channel (physical broadcast channel, PBCH) block (synchronization signal and PBCH block, SSB). The UE can acquire the PCI of the cell according to the synchronization signal in the SSB and the demodulation reference signal (demodulation reference signal, DMRS) of the PBCH. But the present application is not limited thereto.

S604, the UE reads a relationship table A (that is, an example of the third cell set), where the relationship table A is a barred candidate cell list corresponding to the HPLMN of the UE.

The UE may store a relationship table A, and the UE reads the stored relationship table A in step 5 .

For example, the relationship table A may include information about at least one cell, and the cell included in the relationship table A is a barred candidate cell corresponding to the UE's HPLMN, that is, the UE cannot use the cell in the relationship table A as Candidate cells for cell reselection.

Specifically, the relationship table A may include frequency band information, frequency point information, and PCI information of each cell in the at least one cell. But the present application is not limited thereto.

When the UE is a UE that has newly joined the network or is in an initialization state, it may include but not limited to the following two implementation manners.

In an implementation manner, the relationship table A is pre-configured in the system of the UE.

For example, the relationship table A preconfigured by the UE system does not include cell information. The relationship table A is updated by the UE during the moving process. For example, when the UE searches for a cell during the moving process, and the PLMN of the cell is not the peer-to-peer PLMN of the current network where it resides, the UE records the information of the cell in the relationship table A , as the barred candidate cell corresponding to the HPLMN of the UE. But the present application is not limited thereto.

For another example, the UE is pre-configured with the relationship table A when it leaves the factory, and the UE can update the relationship table A during the moving process, and can update the relationship table A through the received system update information when the UE is in use. For example, the UE The manufacturer of the UE pre-configures the relationship table A for the UE when the UE leaves the factory. When the UE is in use, the manufacturer can determine the updated relationship table A according to the location of the UE and the distribution of cells around the location, and pass the network The system update information of the device is sent to the UE, and the UE can update the relationship table A according to the system update information. But the present application is not limited thereto.

For another example, the relationship table A preconfigured by the UE system includes information about one or more cells. For example, the operator may pre-configure the relationship table A in the subscriber identity module (SIM) of the UE, and the relationship table A includes the cell information of one or more non-peer PLMNs corresponding to the HPLMN of the UE, So that the UE can exclude the non-equivalent PLMN cells in the relationship table A for selection and measurement, which can reduce power consumption. The relationship table A can also be updated during the moving process of the UE. But the present application is not limited thereto.

In another implementation manner, the system of the UE does not pre-configure the relationship table A. After the UE searches for a non-peer PLMN cell of an HPLMN, the UE generates a relationship table A, which includes the information of the non-peer PLMN cell, and the UE can use this relationship table in the subsequent cell reselection process a.

S605. After deleting the cells in the relation table A from the cell set A, the UE obtains the cell set B (that is, an example of the first cell set), and performs reselection measurement and evaluation on the cells in the cell set B.

After the UE deletes the barred candidate cell corresponding to the UE's HPLMN (ie, a cell of a non-peer PLMN) from the searched cell set A, it performs reselection measurement and evaluation on the remaining cells (ie, cells in the cell set B).

S606, the UE determines the best candidate cell in the cell set B.

The UE determines the optimal candidate cell for cell reselection according to the results of measurement and evaluation of the cells in the cell set B.

S607, the UE searches for the optimal candidate cell, and receives system information of the optimal candidate cell.

For example, after searching for the SSB of the optimal candidate cell and synchronizing with the cell, the UE obtains the system information of the optimal candidate cell, and the system information includes the identification information of the PLMN of the cell.

S608, the UE judges whether the network of the optimal candidate cell is the EPLMN of the current camping network.

After the UE obtains the identification information of the PLMN of the optimal candidate cell according to the received system message, it can judge whether the PLMN of the optimal candidate cell is the EPLMN of the network where it currently resides.

For example, the network pre-configures at least one EPLMN of the network where the UE currently resides, and the UE can determine whether the PLMN of the optimal candidate cell is at least one EPLMN pre-configured by the network after obtaining the identification information of the PLMN of the optimal candidate cell. One of them, if yes, the PLMN of the optimal candidate cell is the EPLMN of the current resident network; if not, the PLMN of the optimal candidate cell is not the EPLMN of the current resident network.

S609, if the PLMN of the optimal candidate cell is not the EPLMN of the network where it is currently camped on, the UE records the information of the cell in the relationship table A.

When the UE determines that the PLMN of the optimal candidate cell is not the EPLMN of the current camping network, the UE determines that the information of the cell is a barred candidate cell corresponding to the HPLMN of the UE, and records the information of the cell in relation table A. For example, record the frequency point information, frequency band information and PCI of the cell in relational table A. After S609, the UE may continue to perform S605 and subsequent steps.

After executing S605, the UE may determine the optimal candidate cell after excluding the newly added barred candidate cell from the cell set A.

According to the solution of this application, when the UE is in the process of cell reselection, when the measured optimal candidate cell network is not the EPLMN of the current camping network, the UE will not use the frequency point where the cell is located (that is, the operating frequency point of the cell) ) to move out of the reselection candidate cell set (i.e., cell set A), which can prevent the UE from being completely unable to reselect to a better candidate cell on the frequency point, such as the MOCN cell and the NSA anchor cell on the frequency point , improving the flexibility of UE cell selection.

S610, if the PLMN of the optimal candidate cell is the EPLMN of the current camping network, the UE judges that other parameters of the optimal candidate cell meet the camping condition.

If the PLMN of the optimal candidate cell is the EPLMN of the current camping network, the UE may determine whether other parameters of the optimal candidate cell meet the camping condition. If other parameters of the optimal candidate cell meet the residency condition, the UE performs S611; if the condition is not satisfied, the UE may re-determine the optimal candidate cell from other cells.

S611, the UE initiates cell reselection to the optimal candidate cell, and camps on the cell.

According to the solution of the present application, the exclusion of the anchor cell can be avoided, and the probability of terminal equipment accessing the anchor cell to use 5G services is improved. And by storing the information of the prohibited cell selection, the terminal device can measure and evaluate the selected cell, thereby reducing unnecessary power consumption of the terminal device.

The method provided in the embodiment of the present application has been described in detail above. Hereinafter, the device and equipment provided by the embodiment of the present application will be described in detail with reference to FIG. 7 to FIG. 9 . In order to realize the functions in the methods provided by the above embodiments of the present application, each network element may include a hardware structure and/or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above-mentioned functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

Fig. 7 is a schematic block diagram of a communication device provided by an embodiment of the present application. As shown in FIG. 7 , the communication device 700 may include a transceiver unit 720 .

In a possible design, the communication device 700 may correspond to the terminal device in the above method embodiments, and may implement corresponding steps and operations performed by the terminal device. The communication device 700 may be the terminal device itself or a chip configured in (or used in) the terminal device, or other devices, modules, circuits or units capable of implementing the method of the terminal device.

It should be understood that the communication apparatus 700 may correspond to the terminal device in the method according to the embodiment of the present application, and the communication apparatus 700 may include a unit for executing the method performed by the terminal device in FIG. 5 and FIG. 6 . Moreover, each unit in the communication device 700 and the above-mentioned other operations and/or functions are for realizing the corresponding flow of the method in FIG. 5 and FIG. 6 respectively.

Optionally, the communication device 700 may further include a processing unit 710, and the processing unit 710 may be configured to process instructions or data to implement corresponding operations.

It should also be understood that when the communication device 700 is a chip configured in (or used in) a terminal device, the transceiver unit 720 in the communication device 700 may be an input/output interface or circuit of the chip, and the processing in the communication device 700 Unit 710 may be a processor in a chip.

Optionally, the communication device 700 may further include a storage unit 730, which may be used to store instructions or data, and the processing unit 710 may execute the instructions or data stored in the storage unit, so that the communication device realizes corresponding operations .

It should be understood that the transceiver unit 720 in the communication device 700 can be implemented through a communication interface (such as a transceiver or an input/output interface), for example, it can correspond to the transceiver 810 in the terminal device 800 shown in FIG. 8 . The processing unit 710 in the communication apparatus 700 may be implemented by at least one processor, for example, may correspond to the processor 820 in the terminal device 800 shown in FIG. 8 . The processing unit 710 in the communication device 700 may also be implemented by at least one logic circuit. The storage unit 730 in the communication device 700 may correspond to the memory in the terminal device 800 shown in FIG. 8 .

It should also be understood that the specific process for each unit to perform the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, details are not repeated here.

In another possible design, the communication device 700 may correspond to the network device in the above method embodiment, and can implement corresponding steps and operations performed by the above network device. The communication device 700 may be the network device itself or a chip configured in (or used in) the network device, or other devices, modules, circuits or units capable of implementing the method of the network device.

It should be understood that the communication device 700 may correspond to the network device in the method according to the embodiment of the present application, and the communication device 700 may include a unit for performing the method performed by the network device in the methods in FIG. 5 and FIG. 6 . In addition, each unit in the communication device 700 and the above-mentioned other operations and/or functions are for realizing the corresponding flow of the method in FIG. 5 and FIG. 6 respectively.

It should also be understood that when the communication device 700 is a chip configured in (or used in) a network device, the transceiver unit 720 in the communication device 700 may be an input/output interface or circuit of the chip, and the processing in the communication device 700 Unit 710 may be a processor in a chip.

It should be understood that when the communication device 700 is a network device, the transceiver unit 720 in the communication device 700 can be realized through a communication interface (such as a transceiver or an input/output interface), for example, it can correspond to the network device shown in FIG. 9 Transceiver 910 in 900. The processing unit 710 in the communication device 700 can be implemented by at least one processor, for example, it can correspond to the processor 920 in the network device 900 shown in FIG. circuit implementation.

FIG. 8 is a schematic structural diagram of a terminal device 800 provided in an embodiment of the present application. The terminal device 800 may be applied to the system shown in FIG. 1 to perform functions of the terminal device in the foregoing method embodiments. As shown in the figure, the terminal device 800 includes a processor 820 and a transceiver 810 . Optionally, the terminal device 800 further includes a memory. Wherein, the processor 820, the transceiver 810, and the memory may communicate with each other through an internal connection path, and transmit control and/or data signals. The memory is used to store computer programs, and the processor 820 is used to execute the computer programs in the memory to control the transceiver 810 to send and receive signals.

The processor 820 and the memory may be combined into a processing device, and the processor 820 is configured to execute the program codes stored in the memory to realize the above functions. During specific implementation, the memory may also be integrated in the processor 820, or be independent of the processor 820. The processor 820 may correspond to the processing unit in FIG. 7 .

The above-mentioned transceiver 810 may correspond to the transceiver unit in FIG. 7 . The transceiver 810 may include a receiver (or called a receiver, a receiving circuit) and a transmitter (or called a transmitter, a transmitting circuit). Among them, the receiver is used to receive signals, and the transmitter is used to transmit signals.

It should be understood that the terminal device 800 shown in FIG. 8 can implement processes involving the terminal device in the method embodiments shown in FIGS. 5 and 6 . The operations and/or functions of the various modules in the terminal device 800 are respectively for implementing the corresponding processes in the foregoing method embodiments. For details, reference may be made to the descriptions in the foregoing method embodiments, and detailed descriptions are appropriately omitted here to avoid repetition.

The above-mentioned processor 820 can be used to execute the actions implemented by the terminal device described in the previous method embodiments, and the transceiver 810 can be used to execute the actions described in the previous method embodiments sent by the terminal device to the network device or received from the network device. action. For details, please refer to the description in the foregoing method embodiments, and details are not repeated here.

Optionally, the terminal device 800 may further include a power supply, configured to provide power to various devices or circuits in the terminal device.

In addition, in order to make the functions of the terminal equipment more perfect, the terminal equipment 800 may also include input and output devices, such as including one or more of an input unit, a display unit, an audio circuit, a camera, and a sensor. Speakers, microphones, etc. may also be included.

FIG. 9 is a schematic structural diagram of a network device provided by an embodiment of the present application. The network device 900 can be applied to the system shown in FIG. 1 to perform the functions of the network device in the foregoing method embodiments.

It should be understood that the network device 900 shown in FIG. 9 can implement various processes of the network device involved in the method embodiments shown in FIGS. 5 and 6 . The operations and/or functions of the various modules in the network device 900 are respectively for implementing the corresponding processes in the foregoing method embodiments. For details, reference may be made to the descriptions in the foregoing method embodiments, and detailed descriptions are appropriately omitted here to avoid repetition.

It should be understood that the network device 900 shown in FIG. 9 may be an eNB or a gNB. Optionally, the network device includes network devices such as CU, DU, and AAU. Optionally, the CU can be specifically divided into CU-CP and CU-CP. UP. The present application does not limit the specific architecture of the network device.

It should be understood that the network device 900 shown in FIG. 9 may be a CU node or a CU-CP node.

The embodiment of the present application also provides a processing device, including a processor and a (communication) interface; the processor is configured to execute the method in any one of the above method embodiments.

It should be understood that the above processing device may be one or more chips. For example, the processing device may be a field programmable gate array (field programmable gate array, FPGA), an application specific integrated circuit (ASIC), or a system chip (system on chip, SoC). It can be a central processor unit (CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP), or a microcontroller (micro controller unit) , MCU), can also be a programmable controller (programmable logic device, PLD) or other integrated chips.

According to the method provided in the embodiment of the present application, the present application also provides a computer program product, the computer program product comprising: computer program code, when the computer program code is executed by one or more processors, the The device executes the method in the embodiment shown in FIG. 5 and FIG. 6 .

The technical solutions provided by the embodiments of the present application may be fully or partially implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present invention will be generated in whole or in part. The computer may be a general computer, a dedicated computer, a computer network, a network device, a terminal device, a core network device, a machine learning device or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transferred from a website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device including a server, a data center, and the like integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a digital video disc (digital video disc, DVD)), or a semiconductor medium.

According to the method provided in the embodiment of the present application, the present application also provides a computer-readable storage medium, the computer-readable storage medium stores program code, and when the program code is run by one or more processors, the processing includes the The device of the device executes the method in the embodiment shown in FIG. 5 and FIG. 6 .

According to the method provided in the embodiment of the present application, the present application further provides a system, which includes the aforementioned one or more network devices. The system may further include the aforementioned one or more terminal devices.

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

The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

The above is only the specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application, and should covered within the scope of protection of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

A cell selection method, characterized in that, comprising:

The terminal device measures the signal quality of the cells in the first cell set, and determines that the first cell is the optimal cell for cell reselection, and the first cell set is a set of candidate cells for the terminal device to perform cell reselection, so The first set of cells includes the first cell;

If the first network to which the first cell belongs is not a peer-to-peer network of the second network, the terminal device determines a target cell for cell reselection in cells other than the first cell in the first cell set , the second network is the network to which the second cell where the terminal device resides belongs.
The method according to claim 1, further comprising:

The terminal device receives a first message from the first cell, where the first message includes network identification information, where the network identification information is used to indicate that the first cell belongs to the first network.
The method according to claim 1 or 2, characterized in that the method further comprises:

The terminal device searches for at least one frequency point, and determines a second set of cells working on the at least one frequency point;

The terminal device excludes the cells included in the third cell set from the second cell set to obtain the first cell set, where the third cell set includes at least one cell that the terminal device is prohibited from selecting.
The method according to claim 3, further comprising:

The terminal device acquires forbidden cell information;

determining, by the terminal device, the third set of cells according to the forbidden cell information,

Wherein, the prohibited cell information includes identification information of each cell in the third set of cells.
The method according to claim 4, wherein the forbidden cell information further includes frequency point information and/or frequency band information of each cell in the third set of cells.
The method according to claim 4 or 5, characterized in that the method further comprises:

If the first network is not a peer-to-peer network of the second network, the terminal device records the information of the first cell in the forbidden cell information, where the information of the first cell includes the Identification information of the first cell.
The method according to any one of claims 3 to 5, wherein the forbidden cell information is specifically information about forbidden cells corresponding to the home network of the terminal device.
The method according to any one of claims 3 to 7, further comprising:

The terminal device receives a second message from the second cell, where the second message includes frequency point information of neighboring cells, and the frequency point information of neighboring cells is used to indicate the at least one frequency point.
The method according to any one of claims 1 to 8, characterized in that the terminal device is in an idle state.
The method according to any one of claims 1 to 9, wherein the first network and/or the second network is a public land mobile network.
A communication device, characterized by comprising:

a transceiver unit, configured to receive signals from cells in the first set of cells;

A processing unit, configured to measure the signal quality of the cells in the first cell set, and determine that the first cell is the optimal cell for cell reselection, and the first cell set is the candidate cell for the terminal device to perform cell reselection a set, the first set of cells includes the first cell;

The processing unit is further configured to determine, in cells other than the first cell in the first cell set, that the first network to which the first cell belongs is not a peer-to-peer network of the second network A target cell for cell reselection, where the second network is a network to which the second cell where the terminal device resides belongs.
The device according to claim 11, characterized in that,

The transceiver unit is further configured to receive a first message from the first cell, where the first message includes network identification information, and the network identification information is used to indicate that the first cell belongs to the first network.
Apparatus according to claim 11 or 12, characterized in that

The transceiver unit is also used to search for at least one frequency point, and determine a second set of cells working on the at least one frequency point;

The processing unit is further configured to exclude cells contained in a third cell set from the second set of cells to obtain the first set of cells, wherein the third set of cells includes at least one cell that is prohibited from being selected by the terminal device. district.
The device according to claim 13, wherein the processing unit is further used for:

Obtain the forbidden area information;

determining the third set of cells according to the forbidden cell information,

Wherein, the prohibited cell information includes identification information of each cell in the third set of cells.
The device according to claim 14, wherein the forbidden cell information further includes frequency point information and/or frequency band information of each cell in the third set of cells.
Apparatus according to claim 14 or 15, characterized in that

The processing unit is further configured to record the information of the first cell in the prohibited cell information when the first network is not a peer-to-peer network of the second network, wherein the first The cell information includes identification information of the first cell.
The apparatus according to any one of claims 13 to 15, wherein the forbidden cell information is specifically information about forbidden cells corresponding to the home network of the terminal device.
Apparatus according to any one of claims 13 to 17, characterized in that

The transceiver unit is further configured to receive a second message from the second cell, where the second message includes frequency point information of neighboring cells, and the frequency point information of neighboring cells is used to indicate the at least one frequency point.
The apparatus according to any one of claims 11 to 18, wherein the terminal device is in an idle state.
The device according to any one of claims 11 to 19, wherein the first network and/or the second network is a public land mobile network.
A communication device, characterized by comprising a processor and a communication interface, the processor executes the method according to any one of claims 1 to 10 by using the communication interface.
A communication device, characterized by comprising a processor and a memory, the memory is coupled to the processor, and the processor is configured to execute the method according to any one of claims 1 to 10.
A computer-readable storage medium, characterized in that instructions are stored therein, and when the instructions are run on a computer, the computer is made to execute the method according to any one of claims 1 to 10.
A computer program product, characterized by comprising instructions, which, when run on a computer, cause the computer to execute the method according to any one of claims 1 to 10.
A program product, characterized in that the program product includes a computer program, the computer program is stored in a readable storage medium, and at least one processor of a communication device can read the computer program from the readable storage medium , the at least one processor executes the computer program so that the communication device implements the method according to any one of claims 1-10.