CN112889316B

CN112889316B - Cell reselection method and device, and terminal

Info

Publication number: CN112889316B
Application number: CN201980065141.2A
Authority: CN
Inventors: 王淑坤; 石聪
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-05-20
Filing date: 2019-05-20
Publication date: 2022-10-21
Anticipated expiration: 2039-05-20
Also published as: WO2020232611A1; CN112889316A

Abstract

The embodiment of the application provides a cell reselection method, a cell reselection device and a terminal, wherein the method comprises the following steps: a terminal records first information of a first cell and second information of a second cell, wherein the first cell is a serving cell before cell reselection, the second cell is a target cell for reselection, and the second cell is an NR-U cell; the terminal sends first information of the first cell and second information of the second cell to a network, wherein the first information and the second information are used for configuring cell reselection auxiliary information by the network; and the terminal receives cell reselection auxiliary information sent by a network, and judges whether a target NR-U cell is a candidate NR-U cell for cell reselection according to the cell reselection auxiliary information.

Description

Cell reselection method and device, and terminal

Technical Field

The embodiment of the application relates to the technical field of mobile communication, in particular to a cell reselection method, a cell reselection device and a terminal.

Background

At present, because a New Radio-Unlicensed (NR-U) works on an Unlicensed spectrum, any operator may deploy a cell of the frequency point, and the NR-U also supports an NR-U cell independent deployment scenario, which means that the NR-U cell may become a candidate cell for cell reselection. Because different operators can deploy independent NR-U type cells with the same frequency, the cells may reselect to cells of other Public Land Mobile Networks (PLMNs), and if the terminal finds that the cell is not the own cell, the terminal immediately triggers to perform cell selection/reselection to other cells, which causes problems of poor mobility performance of the terminal, power consumption, and the like. If paging occurs or there is a service trigger in the period, problems such as paging loss and large service delay may be caused.

Disclosure of Invention

The embodiment of the application provides a cell reselection method, a cell reselection device and a terminal.

The cell reselection method provided by the embodiment of the application comprises the following steps:

a terminal records first information of a first cell and second information of a second cell, wherein the first cell is a serving cell before cell reselection, the second cell is a target cell for reselection, and the second cell is an NR-U cell;

the terminal sends first information of the first cell and second information of the second cell to a network, wherein the first information and the second information are used for configuring cell reselection auxiliary information by the network;

and the terminal receives cell reselection auxiliary information sent by a network, and judges whether a target NR-U cell is a candidate NR-U cell for cell reselection according to the cell reselection auxiliary information.

The cell reselection device provided in the embodiment of the present application includes:

a recording unit, configured to record first information of a first cell and second information of a second cell, where the first cell is a serving cell before cell reselection, the second cell is a target cell for reselection, and the second cell is an NR-U cell;

a communication unit, configured to send first information of the first cell and second information of the second cell to a network, where the first information and the second information are used by the network to configure cell reselection assistance information; receiving cell reselection auxiliary information sent by a network;

and the processing unit is used for judging whether the target NR-U cell is a candidate NR-U cell for cell reselection according to the cell reselection auxiliary information.

The terminal provided by the embodiment of the application comprises a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and running the computer program stored in the memory to execute the cell reselection method.

The chip provided by the embodiment of the application is used for realizing the cell reselection method.

Specifically, the chip includes: and the processor is used for calling and running the computer program from the memory so that the equipment provided with the chip executes the cell reselection method.

A computer-readable storage medium provided in an embodiment of the present application is used to store a computer program, where the computer program enables a computer to execute the above-mentioned cell reselection method.

The computer program product provided by the embodiment of the present application includes computer program instructions, which enable a computer to execute the above cell reselection method.

The computer program provided in the embodiments of the present application, when running on a computer, causes the computer to execute the above-described cell reselection method.

In the technical solution of the embodiment of the present application, through a Self-Organizing Network (SON) function, a Network side assists a terminal to perform cell reselection, thereby avoiding occurrence of cell reselection to other PLMNs, improving the mobility of the terminal, and saving the power of the terminal.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic diagram of a communication system architecture provided in an embodiment of the present application;

fig. 2 is a schematic diagram of Beam surfing provided in an embodiment of the present application;

FIG. 3 is a schematic representation of an SSB provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of an SSB burst set period provided by an embodiment of the present application;

fig. 5 is a schematic flowchart of a cell reselection method according to an embodiment of the present application;

fig. 6 is a schematic structural component diagram of a cell reselection device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a communication device provided in an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a chip of an embodiment of the present application;

fig. 9 is a schematic block diagram of a communication system according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) System, a General Packet Radio Service (GPRS), a Long Term Evolution (Long Term Evolution, LTE) System, an LTE Frequency Division Duplex (FDD) System, an LTE Time Division Duplex (TDD), a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication System, or a 5G System.

For example, a communication system 100 applied in the embodiment of the present application is shown in fig. 1. The communication system 100 may include a network device 110, and the network device 110 may be a device that communicates with a terminal 120 (or referred to as a communication terminal, terminal). Network device 110 may provide communication coverage for a particular geographic area and may communicate with terminals located within the coverage area. Alternatively, the Network device 110 may be a Base Station (BTS) in a GSM system or a CDMA system, a Base Station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or a Network device in a Mobile switching center, a relay, an Access point, a vehicle-mounted device, a wearable device, a hub, a switch, a bridge, a router, a Network-side device in a 5G Network, or a Network device in a Public Land Mobile Network (PLMN) for future evolution, or the like.

The communication system 100 further comprises at least one terminal 120 located within the coverage area of the network device 110. As used herein, "terminal" includes, but is not limited to, connection via a wireline, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a Digital cable, a direct cable connection; and/or another data connection/network; and/or via a Wireless interface, e.g., for a cellular Network, a Wireless Local Area Network (WLAN), a digital television Network such as a DVB-H Network, a satellite Network, an AM-FM broadcast transmitter; and/or means of another terminal arranged to receive/transmit communication signals; and/or Internet of Things (IoT) devices. A terminal that is arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal", or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data Communications capabilities; PDAs that may include radiotelephones, pagers, internet/intranet access, web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. A terminal can refer to an access terminal, user Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or User Equipment. An access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication capability, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal in a 5G network or a terminal in a future evolved PLMN, etc.

Optionally, the terminals 120 may perform direct-to-Device (D2D) communication therebetween.

Alternatively, the 5G system or the 5G network may also be referred to as a New Radio (NR) system or an NR network.

Fig. 1 exemplarily shows one network device and two terminals, and optionally, the communication system 100 may include a plurality of network devices and may include other numbers of terminals within the coverage of each network device, which is not limited in this embodiment of the present application.

Optionally, the communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited in this embodiment.

It should be understood that, in the embodiments of the present application, a device having a communication function in a network/system may be referred to as a communication device. Taking the communication system 100 shown in fig. 1 as an example, the communication device may include a network device 110 and a terminal 120 having a communication function, and the network device 110 and the terminal 120 may be the specific devices described above and are not described herein again; the communication device may also include other devices in the communication system 100, such as other network entities, for example, a network controller, a mobility management entity, and the like, which are not limited in this embodiment.

It should be understood that the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

To facilitate understanding of the technical solutions of the embodiments of the present application, the following description is made of related technologies related to the embodiments of the present application.

With the pursuit of speed, latency, high-speed mobility, energy efficiency and the diversity and complexity of the services in future life, the third generation partnership project (3) ^rd Generation Partnership Project,3 GPP) international standards organization began to develop 5G. The main application scenarios of 5G are: enhanced Mobile Ultra wide band (eMBB), low Latency high reliability Communication (URLLC), and massive Machine Type Communication (mMTC).

On the one hand, the eMBB still targets users for multimedia content, services and data, and its demand is growing very rapidly. On the other hand, because the eMBB may be deployed in different scenarios, such as indoor, urban, rural, etc., and the difference between the capabilities and the requirements is relatively large, it cannot be said that it must be analyzed in detail in conjunction with a specific deployment scenario. Typical applications of URLLC include: industrial automation, electric power automation, remote medical operation (surgery), traffic safety, and the like. Typical characteristics of mtc include: high connection density, small data volume, insensitive time delay service, low cost and long service life of the module, etc.

When NR is deployed early, complete NR coverage is difficult to obtain, so typical network coverage is wide area LTE coverage and islanding coverage mode of NR. Moreover, a large amount of LTE is deployed below 6GHz, and the spectrum below 6GHz available for 5G is rare. NR must therefore be studied for spectrum applications above 6GHz, with limited high band coverage and fast signal fading. Meanwhile, in order to protect the early-stage LTE investment of mobile operators, a work mode of tight cooperation (light interworking) between LTE and NR, namely an MR-DC mode, is provided.

NR cells may also be deployed independently, with multiple beams for a cell, since each NR cell is beam operated.

NR will be deployed at high frequency in the future, and in order to improve coverage, in 5G, the requirement of coverage (coverage by space, space by time) is satisfied by introducing a beam scanning (beam scanning) mechanism, as shown in fig. 2. After the beam scanning is introduced, a synchronization Signal needs to be transmitted in each beam direction, and a 5G synchronization Signal is given in the form of a synchronization Signal block (SS/PBCH block, SSB) and includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSs), and a Physical Broadcast Channel (PBCH), as shown in fig. 3. The synchronization signal of 5G appears periodically in the time domain in the form of a burst set of synchronization signals (SS burst set), as shown in fig. 4.

The number of beams actually transmitted in each cell is determined by network side configuration, but the frequency point where the cell is located determines the maximum number of beams that can be configured, as shown in table 1 below.

Frequency range	L (maximum beam number)
		up to 3(2.4)GHz	4
3(2.4)GHz-6GHz	8
		6GHz-52.6GHz	64

TABLE 1

After the idle terminal resides in a cell, a cell reselection process is performed to meet the mobility requirement of the idle terminal.

The measurement behavior constraints of all terminals in idle state and the relevant parameters for cell reselection come from system broadcast messages. It is assumed below that all relevant parameters are configured. If not configured, the associated constraint does not exist.

For the starting of the same-frequency measurement, when the serving cell Srxlev is larger than SIntraSearchP and the serving cell Squal is larger than SIntraSearchQ, the same-frequency neighbor measurement is not started, otherwise, the same-frequency neighbor measurement is started.

For pilot frequency measurement with the same priority or low priority, when serving cell Srxlev > SnonIntraSearchP and serving cell Square > SnonIntraSearchQ, pilot frequency measurement with the same priority or low priority is not started, otherwise, pilot frequency measurement with the same priority or low priority is started.

For a high priority inter-frequency measurement, the measurement thereof is always started.

The cell reselection behavior is performed based on measurements of the serving cell and the neighboring cells.

And executing cell reselection on cells with the same frequency and different frequency cells with the same priority, wherein R criteria (sorted according to RSRP) need to be met, the signal quality of a new cell is better than that of the current cell and lasts for a specified time length, and the time of the terminal residing in the original cell is not shorter than 1s.

For the reselection of the high-priority cell, the signal quality of the high-priority cell is required to be higher than a certain threshold and to last for a specified time length, and the time for the terminal to camp in the original cell is not shorter than 1s.

And when the reselection is performed on the cell with low priority, the cell with high priority does not need to be reselected, the cell with the same priority meets the requirement, the signal quality of the original cell is lower than a certain threshold, the signal quality of the cell with low priority is higher than the certain threshold and lasts for a certain time length, and the time for the terminal to stay in the original cell is not shorter than 1s.

The 3GPP RAN working group agreed to the establishment of the NR unlicensed working mode in 2018, month 12, and the project aims to make NR work in an unlicensed frequency band, and includes the following working scenarios:

a carrier aggregation scenario: a Primary Cell (PCell) is an authorized frequency spectrum, a Secondary Cell (SCell) is an unauthorized frequency spectrum, and the PCell and the SCell work in a carrier aggregation mode;

dual connectivity job scenario: the PCell is an LTE authorized frequency spectrum, and the Primary and Secondary Cell (PScell) is an NR unauthorized frequency spectrum;

independent work scenario: the NR operates as an independent cell in unlicensed spectrum.

Generally, the operating Band (Band) of NR-U is 5GHz unlicensed spectrum and 6GHz unlicensed spectrum; on unlicensed spectrum, the design of NR-U should guarantee fairness with other systems already operating on these unlicensed spectrum, such as WiFi and the like. The principle of fairness is that the impact of NR-U on systems already deployed on unlicensed spectrum (e.g., wiFi) cannot exceed the impact between these systems.

At present, since the NR-U operates on an unlicensed spectrum, any operator may deploy a cell of the frequency point, and the NR-U also supports an NR-U cell independent deployment scenario, which means that the NR-U cell may become a candidate cell for cell reselection. Because different operators can deploy the NR-U type cells independently with the same frequency point, the cells can be reselected to the cells of other PLMNs, if the terminal finds that the cells are not the own cells, the terminal can immediately trigger the execution of cell selection/reselection to other cells, and the problems of poor mobility performance, power consumption and the like of the terminal are caused. If paging occurs or there is a service trigger in the period, problems such as paging loss, large service delay and the like may be caused. Therefore, the following technical scheme of the embodiment of the application is provided.

Fig. 5 is a schematic flowchart of a cell reselection method according to an embodiment of the present application, and as shown in fig. 5, the cell reselection method includes the following steps:

step 501: the terminal records first information of a first cell and second information of a second cell, wherein the first cell is a serving cell before cell reselection, the second cell is a target cell for reselection, and the second cell is an NR-U cell.

In this embodiment of the present application, the terminal records the first information of the first cell and the second information of the second cell, which may be implemented in any one of the following manners:

the method I comprises the following steps: the terminal (Idle UE) in an Idle state performs measurement, and if the terminal reselects the second cell, the broadcast information of the second cell is acquired; if the terminal determines that the second cell is a cell not belonging to a first PLMN group or the second cell is a cell belonging to a second PLMN group based on the broadcast information of the second cell, the terminal records first information of the first cell and second information of the second cell; wherein the first PLMN group comprises a first PLMN and/or an equivalent EPLMN list of the first PLMN; the PLMN in the second PLMN group is a PLMN which does not belong to the first PLMN and an equivalent EPLMN list of the first PLMN; the first PLMN is a PLMN selected or served by the terminal.

For example: the method comprises the steps that a terminal in an idle state performs measurement, if the terminal reselects an NR-U cell, system broadcast information of the NR-U cell is obtained, the system broadcast information comprises PLMN information of the NR-U cell, and if the terminal determines that the NR-U cell does not belong to the current selected or served PLMN of the terminal or the NR-U cell is a cell of other PLMNs according to the PLMN information of the NR-U cell, the terminal records first information of the serving cell before cell reselection and second information of the NR-U cell.

The second method comprises the following steps: the method comprises the steps that a terminal (Idle UE) in an Idle state performs measurement, and if the terminal determines that a reselected target cell is the second cell which is an NR-U cell, first information of a first cell is recorded before cell reselection; after the terminal reselects the second cell, acquiring the broadcast information of the second cell; if the terminal determines that the second cell is a cell not belonging to the first PLMN group or the second cell is a cell belonging to the second PLMN group based on the broadcast information of the second cell, the terminal records second information of the second cell; wherein the first PLMN group comprises a first PLMN and/or an equivalent EPLMN list of the first PLMN; the PLMN in the second PLMN group is a PLMN which does not belong to the first PLMN and an equivalent EPLMN list of the first PLMN; the first PLMN is a PLMN selected or served by the terminal.

For example: and the idle terminal performs measurement, and records first information of a serving cell before cell reselection if the terminal determines that the reselected target cell is an NR-U cell. And if the terminal determines that the NR-U cell does not belong to the current selected or served PLMN thereof or the NR-U cell is a cell of other PLMNs according to the PLMN information of the NR-U cell, the terminal records second information of the NR-U cell. Further, if the terminal determines that the NR-U cell belongs to its currently selected or served PLMN according to the PLMN information of the NR-U cell, the terminal deletes the previously recorded first information of the serving cell before cell reselection.

In some optional embodiments of the present application, the first information of the first cell includes at least one of:

cell identification information of the first cell;

a Reference Signal Received Power (RSRP) measurement of the first cell;

a Reference Signal Received Quality (RSRQ) measurement of the first cell;

the RSRP measurement results of n1 strongest neighbor cells of the first cell and corresponding neighbor cell identification information, wherein n1 is a positive integer;

the RSRQ measurement results of n2 strongest neighbor cells of the first cell and corresponding neighbor cell identification information, wherein n2 is a positive integer;

indexes of n3 strongest beams of the first cell and RSRP measurement results of the beams, n3 being a positive integer;

indices of n4 strongest beams of the first cell and RSRQ measurements of the beams, n4 being a positive integer.

In the above solution, the first cell refers to a serving cell before cell reselection, that is, a serving cell in which a terminal is located before cell reselection.

In the foregoing solution, the cell identification information includes at least one of the following: PLMN information, cell id information, tracking Area Code (TAC), radio Access Network Area Code (RANC), physical Cell Identity (PCI).

For example: the first information includes at least one of: cell identification information of a serving cell before cell reselection; the RSRP and/or RSRQ measurement result of the serving cell before cell reselection; the RSRP and/or RSRQ measurement results of n strongest neighbor cells before cell reselection and corresponding neighbor cell identification information, where n is a positive integer, e.g., n =1 or 6; the index of the strongest x beams of the serving cell before cell reselection and RSRP and/or RSRQ measurements of the beams, x being a positive integer, e.g., x =1 or 2, etc.

In some optional embodiments of the present application, the second information of the second cell includes at least one of:

cell identification information of the second cell;

first indication information for indicating that the second cell is a cell not belonging to a first PLMN group or that the second cell is a cell belonging to a second PLMN group;

wherein the first PLMN group comprises a first PLMN and/or an equivalent EPLMN list of the first PLMN; the PLMN in the second PLMN group is a PLMN which does not belong to the first PLMN and an equivalent EPLMN list of the first PLMN; the first PLMN is a PLMN selected or served by the terminal.

In the above scheme, the second cell is a target cell for cell reselection, and the target cell is an NR-U cell.

In the foregoing solution, the cell identification information includes at least one of the following: PLMN information, cell id information, TAC, RANC, PCI.

For example: the second information includes at least one of: cell identification information of the NR-U cell; and the NR-U cell is indication information of other PLMNs, wherein the other PLMNs refer to PLMNs other than the PLMN selected or served by the terminal.

Step 502: and the terminal sends first information of the first cell and second information of the second cell to a network, wherein the first information and the second information are used for configuring cell reselection auxiliary information by the network.

In some optional embodiments of the present application, the sending, by the terminal, the first information of the first cell and the second information of the second cell to the network may be implemented by adopting the following procedures:

1) And after the terminal enters a connected state, sending an RRC message to a network, wherein the RRC message carries second indication information, and the second indication information is used for indicating that the terminal records the first information and the second information.

Here, the RRC message is an RRC setup complete (rrcsetpcompute) message, an RRC reestablishment complete (rrcsetpcompute) message, or an RRC recovery complete (RRCResumeComplete) message.

2) The terminal receives a first request message sent by a network, wherein the first request message is used for asking for the first information and the second information recorded by the terminal.

3) And the terminal sends a first response message to a network, wherein the first response message carries the first information and the second information recorded by the terminal.

In this embodiment of the present application, the cell identification information of the first cell in the first information is used for a network to address the first cell, and forward the first information and the second information to the first cell; the first information and the second information are used for configuring cell reselection assistance information for the first cell.

For example: after receiving the first information and the second information recorded by the terminal, the network side addresses the target cell (namely the serving cell before cell reselection) according to the recorded cell identification information of the serving cell before cell reselection, and forwards the recorded information to the target cell through an Xn interface. It should be noted that, if the serving cell when the terminal enters the connected state is a serving cell before cell reselection, the terminal directly reports the information recorded by the terminal to the serving cell before cell reselection. If the serving cell (assumed to be cell 1) when the terminal enters the connected state is not the serving cell (assumed to be cell 2) before cell reselection, then the cell 1 needs to address to the cell 2 according to the cell identification information of the cell 2 and forward the information recorded by the terminal to the cell 2. By using the SON function, the target cell can receive the above-mentioned record information reported by a large number of terminals or forwarded by other base stations, and then configure cell reselection auxiliary information in the system broadcast according to the record information.

In some optional embodiments of the present application, the cell reselection assistance information includes at least one of:

the RSRP values or ranges corresponding to n1 strongest neighbor cells of the first cell and corresponding neighbor cell identification information, where n1 is a positive integer;

the RSRQ values or ranges corresponding to the n2 strongest neighbor cells of the first cell and the neighbor cell identification information corresponding thereto, where n2 is a positive integer;

indices of n3 strongest beams of the first cell and RSRP values or ranges of the beams, n3 being a positive integer;

indices of n4 strongest beams of the first cell and RSRQ values or ranges of the beams, n4 being a positive integer;

cell identification information of the second cell;

wherein the first PLMN group comprises a first PLMN and/or an equivalent EPLMN list of the first PLMN; the PLMN in the second PLMN group is not the first PLMN and the PLMN of the equivalent EPLMN list of the first PLMN; the first PLMN is a PLMN selected or served by the terminal.

In the above scheme, the first cell refers to a serving cell, that is, a serving cell in which a cell terminal is located.

In the above scheme, the second cell is an NR-U cell.

For example: the cell reselection assistance information includes at least one of: RSRP and/or RSRQ values or ranges corresponding to n neighbors and corresponding neighbor identification information, where n is a positive integer, e.g., n =1 or 6; indices of the strongest x beams of the serving cell and RSRP and/or RSRQ values or ranges of the beams, x being a positive integer, e.g., x =1 or 2, etc.; cell identification information of the NR-U cell (the cell identification information includes at least one of PLMN information, cell id information, TAC, RANC, PCI); and the NR-U cell is indication information of other PLMNs, wherein the other PLMNs refer to PLMNs other than the PLMN selected or served by the terminal.

Step 503: and the terminal receives cell reselection auxiliary information sent by a network, and judges whether a target NR-U cell is a candidate NR-U cell for cell reselection according to the cell reselection auxiliary information.

Here, the idle terminal acquires cell reselection auxiliary information from system broadcast information, performs measurement, and determines whether a target NR-U cell is a candidate NR-U cell for cell reselection according to a measurement result and the cell reselection auxiliary information; wherein the measurement result comprises at least one of: the measurement result of the neighboring cell and the measurement result of the current serving cell.

For example: and the terminal determines that the reselected target cell is an NR-U cell (namely a target NR-U cell) according to the measurement result, judges whether the PLMN of the target NR-U cell is consistent with the PLMN selected or served by the terminal according to the cell reselection auxiliary information, and takes the target NR-U cell as a candidate NR-U cell for cell reselection under the condition of consistency. And if the target NR-U cell is inconsistent with the target NR-U cell, the target NR-U cell is abandoned, and the reselected target cell is determined again.

Fig. 6 is a schematic structural component diagram of a cell reselection device according to an embodiment of the present application, where as shown in fig. 6, the cell reselection device includes:

a recording unit 601, configured to record first information of a first cell and second information of a second cell, where the first cell is a serving cell before cell reselection, the second cell is a target cell for reselection, and the second cell is an NR-U cell;

a communication unit 602, configured to send, to a network, first information of the first cell and second information of the second cell, where the first information and the second information are used for configuring cell reselection assistance information by the network; receiving cell reselection auxiliary information sent by a network;

a processing unit 603, configured to determine whether the target NR-U cell is a candidate NR-U cell for cell reselection according to the cell reselection assistance information.

In some optional embodiments of the present application, the recording unit 602 is configured to, if the terminal reselects the second cell, acquire broadcast information of the second cell; if the terminal determines that the second cell is a cell not belonging to the first PLMN group or the second cell is a cell belonging to the second PLMN group based on the broadcast information of the second cell, the terminal records the first information of the first cell and the second information of the second cell; wherein the first PLMN group comprises a first PLMN and/or an equivalent EPLMN list of the first PLMN; the PLMN in the second PLMN group is a PLMN which does not belong to the first PLMN and an equivalent EPLMN list of the first PLMN; the first PLMN is a PLMN selected or served by the terminal.

In some optional embodiments of the present application, the recording unit 602 is configured to record, before cell reselection, first information of the first cell, if the terminal determines that the reselected target cell is the second cell, and the second cell is an NR-U cell; after the terminal reselects the second cell, acquiring the broadcast information of the second cell; if the terminal determines that the second cell is a cell not belonging to the first PLMN group or the second cell is a cell belonging to the second PLMN group based on the broadcast information of the second cell, the terminal records second information of the second cell; wherein the first PLMN group comprises a first PLMN and/or an equivalent EPLMN list of the first PLMN; the PLMN in the second PLMN group is not the first PLMN and the PLMN of the equivalent EPLMN list of the first PLMN; the first PLMN is a PLMN selected or served by the terminal.

cell identification information of the first cell;

an RSRP measurement of the first cell;

an RSRQ measurement of the first cell;

the RSRP measurement results of n1 strongest neighbor cells of the first cell and corresponding neighbor cell identification information are obtained, and n1 is a positive integer;

cell identification information of the second cell;

In some optional embodiments of the present application, the cell identification information includes at least one of: PLMN information, cell id information, TAC, RANC, PCI.

In some optional embodiments of the present application, the communication unit is configured to send an RRC message to a network, where the RRC message carries second indication information, and the second indication information is used to indicate that the terminal records the first information and the second information; receiving a first request message sent by a network, wherein the first request message is used for asking for the first information and the second information recorded by the terminal; and sending a first response message to a network, wherein the first response message carries the first information and the second information recorded by the terminal.

In some optional embodiments of the present application, the RRC message is an RRC setup complete message, an RRC reestablishment complete message, or an RRC recovery complete message.

In some optional embodiments of the present application, the first information and the second information are used for the network to configure cell reselection assistance information, and include:

the cell identification information of the first cell in the first information is used for a network to address the first cell and forward the first information and the second information to the first cell; the first information and the second information are used for configuring cell reselection assistance information for the first cell.

the RSRQ values or ranges corresponding to the n2 strongest neighbor cells of the first cell and the corresponding neighbor cell identification information, where n2 is a positive integer;

cell identification information of the second cell;

In some optional embodiments of the present application, the processing unit is configured to determine, according to the measurement result and the cell reselection assistance information, whether a target NR-U cell is a candidate NR-U cell for cell reselection;

wherein the measurement result comprises at least one of: the measurement result of the neighboring cell and the measurement result of the current serving cell.

It should be understood by those skilled in the art that the above-mentioned description of the cell reselection device according to the embodiment of the present application can be understood by referring to the relevant description of the cell reselection method according to the embodiment of the present application.

Fig. 7 is a schematic structural diagram of a communication device 700 according to an embodiment of the present application. The communication device may be a terminal or a network device, and the communication device 700 shown in fig. 7 includes a processor 710, and the processor 710 may call and execute a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 7, the communication device 700 may further include a memory 720. From the memory 720, the processor 710 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 720 may be a separate device from the processor 710, or may be integrated into the processor 710.

Optionally, as shown in fig. 7, the communication device 700 may further include a transceiver 730, and the processor 710 may control the transceiver 730 to communicate with other devices, and specifically, may transmit information or data to the other devices or receive information or data transmitted by the other devices.

The transceiver 730 may include a transmitter and a receiver, among other things. The transceiver 730 may further include antennas, which may be one or more in number.

Optionally, the communication device 700 may specifically be a network device according to this embodiment, and the communication device 700 may implement a corresponding process implemented by the network device in each method according to this embodiment, which is not described herein again for brevity.

Optionally, the communication device 700 may specifically be a mobile terminal/terminal according to this embodiment, and the communication device 700 may implement a corresponding process implemented by the mobile terminal/terminal in each method according to this embodiment, which is not described herein again for brevity.

Fig. 8 is a schematic structural diagram of a chip of an embodiment of the present application. The chip 800 shown in fig. 8 includes a processor 810, and the processor 810 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

Optionally, as shown in fig. 8, chip 800 may further include a memory 820. From the memory 820, the processor 810 can call and run a computer program to implement the method in the embodiment of the present application.

The memory 820 may be a separate device from the processor 810 or may be integrated into the processor 810.

Optionally, the chip 800 may further include an input interface 830. The processor 810 may control the input interface 830 to communicate with other devices or chips, and specifically, may obtain information or data transmitted by other devices or chips.

Optionally, the chip 800 may further include an output interface 840. The processor 810 can control the output interface 840 to communicate with other devices or chips, and in particular, can output information or data to other devices or chips.

Optionally, the chip may be applied to the network device in the embodiment of the present application, and the chip may implement the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the chip may be applied to the mobile terminal/terminal in the embodiment of the present application, and the chip may implement a corresponding process implemented by the mobile terminal/terminal in each method in the embodiment of the present application, and for brevity, no further description is given here.

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

Fig. 9 is a schematic block diagram of a communication system 900 provided in an embodiment of the present application. As shown in fig. 9, the communication system 900 includes a terminal 910 and a network device 920.

The terminal 910 may be configured to implement corresponding functions implemented by the terminal in the foregoing method, and the network device 920 may be configured to implement corresponding functions implemented by the network device in the foregoing method, which are not described herein again for brevity.

It should be understood that the processor of the embodiments of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, etc. as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. The volatile Memory may be a Random Access Memory (RAM) which serves as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), enhanced Synchronous SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

It should be understood that the above memories are exemplary but not limiting, for example, the memories in the embodiments of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), direct Rambus RAM (DR RAM), and the like. That is, the memory in the embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.

The embodiment of the application also provides a computer readable storage medium for storing the computer program.

Optionally, the computer-readable storage medium may be applied to the network device in the embodiment of the present application, and the computer program enables a computer to execute corresponding processes implemented by the network device in the methods in the embodiment of the present application, which are not described herein again for brevity.

Optionally, the computer-readable storage medium may be applied to the mobile terminal/terminal in the embodiment of the present application, and the computer program enables the computer to execute the corresponding process implemented by the mobile terminal/terminal in each method in the embodiment of the present application, which is not described herein again for brevity.

Embodiments of the present application also provide a computer program product, including computer program instructions.

Optionally, the computer program product may be applied to the network device in the embodiment of the present application, and the computer program instruction enables the computer to execute a corresponding process implemented by the network device in each method in the embodiment of the present application, which is not described herein again for brevity.

Optionally, the computer program product may be applied to the mobile terminal/terminal in the embodiment of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the mobile terminal/terminal in the methods in the embodiment of the present application, which are not described herein again for brevity.

The embodiment of the application also provides a computer program.

Optionally, the computer program may be applied to the network device in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the network device in each method in the embodiment of the present application, and for brevity, details are not described here again.

Optionally, the computer program may be applied to the mobile terminal/terminal in the embodiment of the present application, and when the computer program runs on a computer, the computer is enabled to execute the corresponding process implemented by the mobile terminal/terminal in each method in the embodiment of the present application, which is not described herein again for brevity.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of cell reselection, the method comprising:

a terminal records first information of a first cell and second information of a second cell, wherein the first cell is a serving cell before cell reselection, the second cell is a target cell for reselection, and the second cell is a new wireless authorization-free NR-U cell;

and the terminal receives cell reselection auxiliary information sent by a network, and judges whether a target NR-U cell is a candidate NR-U cell for cell reselection or not according to the cell reselection auxiliary information.

2. The method of claim 1, wherein the terminal records first information of a first cell and second information of a second cell, comprising:

if the terminal reselects the second cell, acquiring the broadcast information of the second cell;

if the terminal determines that the second cell is a cell not belonging to a first Public Land Mobile Network (PLMN) group or the second cell is a cell belonging to a second PLMN group based on the broadcast information of the second cell, the terminal records first information of the first cell and second information of the second cell;

3. The method of claim 1, wherein the terminal records first information of a first cell and second information of a second cell, comprising:

if the terminal determines that the reselected target cell is the second cell which is an NR-U cell, recording first information of the first cell before cell reselection;

after the terminal reselects the second cell, acquiring the broadcast information of the second cell;

if the terminal determines that the second cell is a cell not belonging to the first PLMN group or the second cell is a cell belonging to the second PLMN group based on the broadcast information of the second cell, the terminal records second information of the second cell;

4. The method of any of claims 1 to 3, wherein the first information of the first cell comprises at least one of:

cell identification information of the first cell;

a reference signal received power, RSRP, measurement of the first cell;

a reference signal received quality, RSRQ, measurement of the first cell;

5. The method of any of claims 1 to 3, wherein the second information of the second cell comprises at least one of:

cell identification information of the second cell;

6. The method of claim 4, wherein the cell identification information comprises at least one of: PLMN information, cell id information, tracking area code TAC, radio access network area code RANC, physical cell identity PCI.

7. The method of any of claims 1 to 3, wherein the terminal sending the first information of the first cell and the second information of the second cell to a network comprises:

after entering a connected state, the terminal sends an RRC message to a network, wherein the RRC message carries second indication information, and the second indication information is used for indicating that the terminal records the first information and the second information;

the terminal receives a first request message sent by a network, wherein the first request message is used for asking for the first information and the second information recorded by the terminal;

and the terminal sends a first response message to a network, wherein the first response message carries the first information and the second information recorded by the terminal.

8. The method of claim 7, wherein the RRC message is an RRC setup complete message, or an RRC reestablishment complete message, or an RRC recovery complete message.

9. The method of claim 7, wherein the first information and the second information are used for the network configured cell reselection assistance information, comprising:

10. The method of any of claims 1-3, wherein the cell reselection assistance information comprises at least one of:

cell identification information of the second cell;

11. A method according to any one of claims 1 to 3, wherein said deciding whether a target NR-U cell is a candidate NR-U cell for cell reselection in dependence on said cell reselection assistance information comprises:

the terminal judges whether a target NR-U cell is a candidate NR-U cell for cell reselection according to the measurement result and the cell reselection auxiliary information;

12. An apparatus for cell reselection, the apparatus comprising:

a communication unit, configured to send, to a network, first information of the first cell and second information of the second cell, where the first information and the second information are used for configuring cell reselection assistance information by the network; receiving cell reselection auxiliary information sent by a network;

13. The apparatus of claim 12, wherein the recording unit is configured to acquire broadcast information of the second cell if the terminal reselects the second cell; if the terminal determines that the second cell is a cell not belonging to a first PLMN group or the second cell is a cell belonging to a second PLMN group based on the broadcast information of the second cell, the terminal records first information of the first cell and second information of the second cell; wherein the first PLMN group comprises a first PLMN and/or an equivalent EPLMN list of the first PLMN; the PLMN in the second PLMN group is a PLMN which does not belong to the first PLMN and an equivalent EPLMN list of the first PLMN; the first PLMN is a PLMN selected or served by the terminal.

14. The apparatus according to claim 12, wherein the recording unit is configured to record the first information of the first cell before cell reselection, if the terminal determines that the reselected target cell is the second cell, and the second cell is an NR-U cell; after the terminal reselects the second cell, acquiring the broadcast information of the second cell; if the terminal determines that the second cell is a cell not belonging to the first PLMN group or the second cell is a cell belonging to the second PLMN group based on the broadcast information of the second cell, the terminal records second information of the second cell; wherein the first PLMN group comprises a first PLMN and/or an equivalent EPLMN list of the first PLMN; the PLMN in the second PLMN group is not the first PLMN and the PLMN of the equivalent EPLMN list of the first PLMN; the first PLMN is a PLMN selected or served by the terminal.

15. The apparatus of any of claims 12 to 14, wherein the first information of the first cell comprises at least one of:

cell identification information of the first cell;

an RSRP measurement of the first cell;

an RSRQ measurement of the first cell;

indices of n3 strongest beams of the first cell and RSRP measurement results of the beams, n3 being a positive integer;

16. The apparatus of any of claims 12 to 14, wherein the second information of the second cell comprises at least one of:

cell identification information of the second cell;

wherein the first PLMN group comprises a first PLMN and/or an equivalent EPLMN list of the first PLMN; the PLMN in the second PLMN group is a PLMN which does not belong to the first PLMN and an equivalent EPLMN list of the first PLMN; the first PLMN is a PLMN selected or served by a terminal.

17. The apparatus of claim 15, wherein the cell identification information comprises at least one of: PLMN information, cell id information, TAC, RANC, PCI.

18. The apparatus according to any one of claims 12 to 14, wherein the communication unit is configured to send an RRC message to a network, where the RRC message carries second indication information, where the second indication information is used to indicate that a terminal records the first information and the second information; receiving a first request message sent by a network, wherein the first request message is used for asking for the first information and the second information recorded by the terminal; and sending a first response message to a network, wherein the first response message carries the first information and the second information recorded by the terminal.

19. The apparatus of claim 18, wherein the RRC message is an RRC setup complete message, or an RRC reestablishment complete message, or an RRC recovery complete message.

20. The apparatus of claim 18, wherein the first information and the second information are for the network configured cell reselection assistance information, comprising:

the cell identification information of the first cell in the first information is used for network addressing of the first cell, and the first information and the second information are forwarded to the first cell; the first information and the second information are used for configuring cell reselection assistance information for the first cell.

21. The apparatus of any of claims 12-14, wherein the cell reselection assistance information comprises at least one of:

the RSRP values or ranges corresponding to n1 strongest neighbor cells of the first cell and corresponding neighbor cell identification information, wherein n1 is a positive integer;

cell identification information of the second cell;

first indication information for indicating whether the second cell is a cell not belonging to a first PLMN group or whether the second cell is a cell belonging to a second PLMN group;

wherein the first PLMN group comprises a first PLMN and/or an equivalent EPLMN list of the first PLMN; the PLMN in the second PLMN group is not the first PLMN and the PLMN of the equivalent EPLMN list of the first PLMN; the first PLMN is a PLMN selected or served by a terminal.

22. The apparatus according to any one of claims 12 to 14, wherein the processing unit is configured to determine, according to the measurement result and the cell reselection assistance information, whether a target NR-U cell is a candidate NR-U cell for cell reselection;

23. A terminal, comprising: a processor and a memory for storing a computer program, the processor being configured to invoke and execute the computer program stored in the memory to perform the method of any of claims 1 to 11.

24. A chip, comprising: a processor for calling and running a computer program from a memory so that a device on which the chip is installed performs the method of any one of claims 1 to 11.

25. A computer-readable storage medium storing a computer program for causing a computer to perform the method of any one of claims 1 to 11.