CN116709436A

CN116709436A - Cell reselection method and device, storage medium and terminal equipment

Info

Publication number: CN116709436A
Application number: CN202210178040.XA
Authority: CN
Inventors: 邓云
Original assignee: Spreadtrum Communications Shanghai Co Ltd
Current assignee: Spreadtrum Communications Shanghai Co Ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2023-09-05

Abstract

A cell reselection method and device, a storage medium and a terminal device, wherein the cell reselection method comprises the following steps: detecting synchronization signals of resident cells and synchronization signals of other cells in a reduced capacity initial bandwidth part, wherein the reduced capacity initial bandwidth part of the resident cells and the other cells have frequency superposition areas; determining whether to perform cell reselection based at least on the second measurement; or when the first measured value of the synchronous signal of the other cell is larger than the second measured value of the synchronous signal of the resident cell, the cell reselection is executed according to the comparison result of the frequency priority of the resident cell and the frequency priority of the other cell and the first measured value, or whether the cell reselection is executed is determined according to the comparison result and the same-frequency reselection parameter. By the technical scheme of the invention, the success rate of random access of the terminal equipment with reduced capacity can be ensured.

Description

Cell reselection method and device, storage medium and terminal equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a cell reselection method and apparatus, a storage medium, and a terminal device.

Background

In New Radio (NR) communication protocol versions 15 (Release 15, R15) and R16, the protocol requires a terminal device (UE) to support a bandwidth of 100 MHz. The large bandwidth increases the cost of the terminal significantly, and in order to reduce the cost of the terminal, the current protocol version R17 is ready to introduce a reduced capability (Reduced Capability, redCap) terminal that supports only 20MHz of bandwidth at low frequencies.

In order to support access for terminals of 20MHz, the cell may be configured as follows: the cell configures a common Initial bandwidth part (Initial BandWidth Part, initial BWP) suitable for a common terminal device access, which may be 20MHz or more, through a master information block (Master Information Block, MIB) and a system information block (System Information Block, SIB) 1. In the normal initial bandwidth portion there are a synchronization signal block (Synchronization Signal Block, SSB) and a control resource set 0 (Control Resource Set, coreset 0). Because the normal initial bandwidth portion may be greater than 20MHz, the reduced capability terminal device cannot access the cell through the normal initial bandwidth portion, and the cell configures another separate initial bandwidth portion (which may be referred to as a reduced capability initial bandwidth portion, redCap specific BWP) for reduced capability terminal device access through the system message (which may be SIB 1). When the reduced capability terminal device resides in this cell, if access to the network is required, the access is via a separate initial bandwidth part adapted to the reduced capability terminal device, e.g. by the BWP implementing a random access procedure.

However, the terminal device typically selects the strongest cell for camping according to the common bandwidth portion, and the common initial bandwidth portion and the reduced-capability bandwidth portion are two independent bandwidth portions, so that for the reduced-capability terminal device, the signal quality of the camping cell may not be the best among all cells to which the reduced-capability bandwidth portion belongs, and the probability of initiating a random access procedure failure is higher.

Disclosure of Invention

The technical problem solved by the invention is how to ensure the success rate of random access of terminal equipment with reduced capacity.

In order to solve the above technical problems, in a first aspect, an embodiment of the present invention provides a cell reselection method, where the cell reselection method includes: detecting synchronization signals of resident cells and synchronization signals of other cells in a reduced capacity initial bandwidth part, wherein the reduced capacity initial bandwidth part of the resident cells and the other cells have frequency superposition areas; determining whether to perform cell reselection based at least on the second measurement; or when the first measured value of the synchronization signal of the other cell is larger than the second measured value of the synchronization signal of the resident cell, executing cell reselection according to the comparison result of the frequency priority of the resident cell and the frequency priority of the other cell and the first measured value, or determining whether to execute cell reselection according to the comparison result and the same-frequency reselection parameter.

Optionally, the determining whether to perform cell reselection at least according to the second measurement value includes: determining to camp on the camping cell or to perform cell reselection according to the second measurement value; or determining to camp on the camping cell or performing cell reselection according to a second measurement value when the first measurement value of the synchronization signal of the other cell is larger than the second measurement value of the synchronization signal of the camping cell.

Optionally, the determining to camp on the camping cell or performing cell reselection according to the second measurement value includes: if the second measured value reaches a first threshold, continuing to camp on the camping cell; or if the second measurement value does not reach the first threshold, performing cell reselection.

Optionally, the first threshold is carried in a system message of the camping cell.

Optionally, the performing cell reselection according to the comparison result of the frequency priority of the camping cell and the frequency priorities of the other cells and the first measured value includes: and if the comparison result shows that the frequency priority of the other cell is higher than or equal to the frequency priority of the resident cell, and the other cell is determined to be the strongest cell on the affiliated frequency according to the first measured value, performing cell reselection to reselect to the other cell.

Optionally, the determining whether to perform cell reselection according to the comparison result and the same frequency reselection parameter includes: and if the comparison result shows that the frequency priority of the other cell is lower than that of the resident cell, determining whether to execute cell reselection according to the same-frequency reselection parameters of the other cell.

Optionally, the determining whether to perform cell reselection according to the co-channel reselection parameters of the other cells includes: if the same frequency reselection parameters of other cells indicate permission, continuing to camp on the camping cell.

Optionally, the determining whether to perform cell reselection according to the co-channel reselection parameters of the other cells includes: if the same-frequency reselection parameter of other cells indicates that the same-frequency reselection parameter is not allowed, performing cell reselection according to the frequency priority of the cell so as to reselect to the cell with the frequency priority higher than the frequency priority of the resident cell; if the reselection to the cell with the higher frequency priority than the resident cell is not performed, performing the cell reselection to reselect to the other cell.

In a second aspect, an embodiment of the present invention further discloses a cell reselection device, where the cell reselection device includes: a monitoring module, which is applied to monitor the synchronization signals of a resident cell and the synchronization signals of other cells in a capacity-reduction initial bandwidth part, wherein the capacity-reduction initial bandwidth part is positioned in a frequency superposition area of the resident cell and the other cells; a first cell reselection module, configured to determine to camp on the camping cell or perform cell reselection according to a second measurement value when the first measurement value of the synchronization signal of the other cell is greater than the second measurement value of the synchronization signal of the camping cell; or the second cell reselection module is configured to execute cell reselection according to a comparison result of the frequency priority of the camping cell and the frequency priority of the other cell and the first measurement value, or determine whether to execute cell reselection according to the comparison result and the same frequency reselection parameter when the first measurement value of the synchronization signal of the other cell is greater than the second measurement value of the synchronization signal of the camping cell.

In a third aspect, embodiments of the present invention also disclose a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the cell reselection method.

In a fourth aspect, the embodiment of the present invention further discloses a terminal device, including a memory and a processor, where the memory stores a computer program capable of running on the processor, and the processor executes the steps of the cell reselection method when running the computer program.

In a fifth aspect, the embodiment of the present invention further discloses a cell reselection method, where the cell reselection method includes: measuring a first measurement of a synchronization signal of a camping cell in a first reduced capability initial bandwidth portion; if the first measurement value indicates that the camping cell is not the strongest cell on the frequency to which it belongs, performing cell reselection according to a first frequency priority of the first reduced capability initial bandwidth portion, the camping cell comprising the first reduced capability initial bandwidth portion and a normal initial bandwidth portion, the first frequency priority being different from the frequency priority of the normal initial bandwidth portion.

Optionally, the performing cell reselection according to the first frequency priority of the first reduced capability initial bandwidth portion includes: acquiring a second reduced capability initial bandwidth part with a second frequency priority higher than the first frequency priority, wherein the second reduced capability initial bandwidth part is positioned in a second cell; measuring a measurement of the second cell in the second reduced capability initial bandwidth portion; and if the second cell is determined to be the strongest cell on the affiliated frequency according to the second measured value, performing cell reselection to reselect to the second cell.

In a sixth aspect, the embodiment of the present invention further discloses a cell reselection device, where the cell reselection device includes: the detection module is used for detecting the synchronous signals of the resident cell and the synchronous signals of other cells in the capacity-reduction initial bandwidth part, and the capacity-reduction initial bandwidth part of the resident cell and the other cells have frequency superposition areas; a first cell reselection module for determining whether to perform cell reselection based at least on the second measurement value; or the second cell reselection module is configured to execute cell reselection according to a comparison result of the frequency priority of the camping cell and the frequency priority of the other cell and the first measurement value, or determine whether to execute cell reselection according to the comparison result and the same frequency reselection parameter when the first measurement value of the synchronization signal of the other cell is greater than the second measurement value of the synchronization signal of the camping cell.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

in the technical scheme of the invention, whether to execute cell reselection is determined at least according to the second measured value, or if the first measured value of the synchronous signal of the other cell is larger than the second measured value of the synchronous signal of the resident cell, the cell reselection is executed according to the comparison result of the frequency priority of the resident cell and the frequency priority of the other cell and the first measured value, or whether to execute cell reselection is determined according to the comparison result and the same frequency reselection parameter. In the technical scheme of the invention, whether to execute cell reselection is determined by the second measured value, if the second measured value is higher than a certain threshold, the cell is continuously resided in the current cell, so that the success rate of access can be ensured; in addition, cell reselection is performed according to the comparison result and the first measured value, so that the terminal equipment with reduced capability can be reselected to the strongest cell with higher frequency priority, and the access success rate is improved.

Further, measuring a first measurement of a synchronization signal of a camping cell in a first reduced capability initial bandwidth portion; if the first measurement value indicates that the camping cell is not the strongest cell on the frequency to which it belongs, performing cell reselection according to a first frequency priority of the first reduced capability initial bandwidth portion, the camping cell comprising the first reduced capability initial bandwidth portion and a normal initial bandwidth portion, the first frequency priority being different from the frequency priority of the normal initial bandwidth portion. In the technical scheme of the invention, the capacity-reducing initial bandwidth part and the common initial bandwidth part have different frequency priorities, and when the cell reselection is carried out, the cell reselection can be carried out only according to the common initial bandwidth part, so that the terminal equipment with the capacity reduced has the opportunity to reselect to the strongest cell with higher frequency priority, and the access success rate is improved.

Drawings

Fig. 1 is a flowchart of a cell reselection method according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a specific application scenario according to an embodiment of the present application;

fig. 3 is a flow chart of another cell reselection method in accordance with an embodiment of the present application;

fig. 4 is a schematic structural diagram of a cell reselection device according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of another cell reselection apparatus according to an embodiment of the present application.

Detailed Description

Communication systems to which embodiments of the present application are applicable include, but are not limited to, long term evolution (long term evolution, LTE) systems, fifth generation (5G) systems, NR systems, and future evolution systems or multiple communication convergence systems. The 5G system may be a non-independent Networking (NSA) 5G system or an independent networking (SA) 5G system. The technical scheme of the application is also suitable for different network architectures, including but not limited to a relay network architecture, a dual link architecture, a Vehicle-to-evaluation architecture and the like.

The present application relates generally to communication between a terminal device and a network device. Wherein:

the network device in the embodiment of the present application may also be referred to as an access network device, for example, may be a Base Station (BS) (also referred to as a base station device), where the network device is a device deployed in a radio access network (Radio Access Network, RAN) to provide a wireless communication function. For example, the device for providing base station functionality in the second generation (2 nd-generation, 2G) network comprises a base radio transceiver station (base transceiver station, BTS), the device for providing base station functionality in the third generation (3 rd-generation, 3G) network comprises a node B (NodeB), the device for providing base station functionality in the fourth generation (4 th-generation, 4G) network comprises an evolved node B (eNB), the device for providing base station functionality in the wireless local area network (wireless local area networks, WLAN) is an Access Point (AP), the next generation base station node (next generation node base station, gNB) in the NR is an Access Point (AP), and the node B (ng-eNB) continues to evolve, wherein the communication between the gNB and the terminal device is performed using NR technology, and the communication between the ng-eNB and the terminal device is performed using evolved universal terrestrial radio access (Evolved Universal Terrestrial Radio Access, E-UTRA) technology, both the gNB and the ng-eNB may be connected to the 5G core network. The network device in the embodiment of the present application further includes a device for providing a base station function in a new communication system in the future, and the like.

The terminal device (terminal equipment) in embodiments of the present application may refer to various forms of access terminals, subscriber units, subscriber stations, mobile Stations (MSs), remote stations, remote terminals, mobile devices, user terminals, wireless communication devices, user agents, or user equipment. The terminal device may also be a cellular telephone, a cordless telephone, a session initiation protocol (Session Initiation Protocol, SIP) phone, a wireless local loop (Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital Assistant, PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc., as embodiments of the present application are not limited in this regard. The terminal device may also be referred to as a User Equipment (UE), a terminal, etc.

As described in the background, the terminal device typically selects the strongest cell for camping according to the normal Initial bandwidth part (Initial BWP), and the Initial bandwidth part and the reduced-capability bandwidth part (RedCap specific Initial BWP) are two independent bandwidth parts, then the reduced-capability terminal device may not be located in the strongest cell in the reduced-capability bandwidth part, and the probability of random access failure is high.

In the technical scheme of the invention, whether to execute cell reselection is determined by the second measured value, if the second measured value is higher than a certain threshold, the cell is continuously resided in the current cell, so that the success rate of access can be ensured; in addition, cell reselection is performed according to the frequency priority comparison result and the first measured value, so that the terminal equipment with reduced capability can be reselected to the strongest cell with higher frequency priority, and the access success rate is improved.

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

Fig. 1 is a flowchart of a cell reselection method according to an embodiment of the present invention.

The cell reselection method of the embodiment of the invention can be used on the terminal equipment side, namely, the terminal equipment can execute each step of the method. More specifically, the steps of the above method may be performed by a reduced capability terminal device (which may also be referred to as a relaxed capability terminal device).

In particular, the method may comprise the steps of:

step 101: detecting the synchronous signals of resident cells and the synchronous signals of other cells in the capacity-reducing initial bandwidth part, wherein the capacity-reducing initial bandwidth part of the current resident cell and the other cells have frequency superposition areas;

Step 102: a determination is made whether to perform cell reselection based at least on the second measurement.

In a specific embodiment, the terminal device may not detect the first measurement of the other cell, in which case the terminal device may perform cell reselection based on the second measurement of the synchronization signal of the camping cell.

In another embodiment, the terminal device detects a first measurement value of the other cell, and when the first measurement value is greater than the second measurement value, the terminal device may perform cell reselection according to the second measurement value of the synchronization signal of the camping cell. In this case, of course, the terminal device may perform cell reselection only on the second measurement value, regardless of the size relationship between the first measurement value and the second measurement value.

In an alternative embodiment, step 102 shown in fig. 1 may be replaced with step 103: and when the first measured value of the synchronous signal of the other cell is larger than the second measured value of the synchronous signal of the resident cell, executing cell reselection according to the comparison result of the frequency priority of the resident cell and the frequency priority of the other cell and the first measured value, or determining whether to execute cell reselection according to the comparison result and the same-frequency reselection parameter.

In this embodiment, the terminal device performs Cell reselection (or referred to as triggering Cell reselection), which means that the terminal device cannot camp on the current serving Cell, the terminal device needs to attempt to camp on other Suitable cells (useable cells), the terminal device needs to determine Suitable cells according to the frequency priorities of different cells and the measured values of the Cell synchronization signals, and the terminal device reselects to the determined Suitable cells. If there is no suitable cell, the terminal device enters any cell selection state (Any Cell Selection State).

It should be noted that the serial numbers of the steps in the present embodiment do not represent a limitation on the execution sequence of the steps. For example, step 102 and step 103 may be alternatively performed. Step 101 does not limit that the terminal device performs measurement only in the reduced capability initial bandwidth portion, and the terminal device needs to determine the frequency to be measured according to the measurement value and the frequency priority of the camping cell, and may only measure the currently camping frequency, or also need to measure the neighbor cells on the frequencies with higher frequency priorities.

It will be appreciated that in a specific implementation, the cell reselection method may be implemented in a software program, where the software program runs on a processor integrated within a chip or a chip module. The method may also be implemented by combining software with hardware, and the application is not limited.

In the embodiment of the invention, the terminal equipment resides in a residence cell, the cell is a service cell of the terminal equipment, and the terminal equipment receives a system message and the like from the cell; more specifically, the terminal device resides in an initial bandwidth portion or reduced capability initial bandwidth portion of the camping cell configuration. Unless otherwise specified, the term terminal device in the embodiments of the present invention refers to a reduced capability terminal device.

It should be noted that, in the embodiment of the present invention, each cell may be configured with a reduced capability initial bandwidth portion and a Normal initial bandwidth portion, where the reduced capability initial bandwidth portion is used for a reduced capability terminal device to monitor paging (paging), perform random access, and the like, and the Normal initial bandwidth portion is used for a Normal terminal device (Normal UE) to monitor paging, perform random access, and the like. Another approach is for the reduced capability terminal device to receive pages in the normal initial bandwidth portion and to perform random access in the reduced capability initial bandwidth portion.

In particular, when the terminal device resides in Cell1 (i.e. resides in a Cell), cell reselection needs to be performed according to the system message of Cell1, and Cell1 is located at frequency point F1.Cell1 broadcasts a reduced capability initial bandwidth portion for reduced capability terminal devices in a SIB (e.g., SIB 1). Cell2 and Cell1 are adjacent to each other, and Cell2 is located at frequency point F2.

Referring to fig. 2 in particular, in the network deployment shown in fig. 2, there is overlapping of part of frequencies of Cell1 and Cell2, and in the frequency overlapping area, both cells are configured to reduce the initial bandwidth of the capability, that is, BWP2 and BWP3.Cell1 also configures a normal initial bandwidth portion BWP1 and Cell2 also configures a normal initial bandwidth portion BWP4.

If the reduced capability terminal device residing in Cell1 still detects that Cell1 is the strongest Cell of the current frequency point on frequency point F1, the reduced capability initial bandwidth portion used by itself, i.e. BWP2 shown in fig. 2, is known from the SIB of Cell 1. After obtaining the system message of Cell1, the terminal equipment tunes its own radio frequency transceiver to the reduced capability initial bandwidth part of Cell1 so as to monitor paging; or continue to camp on the initial bandwidth portion listening for pages. It should be noted that, the terminal device resides in the serving cell, and still needs to measure other cells with the same frequency and other cells with different frequencies or different systems to perform cell reselection. Typically, cell1 may configure a non-Cell-defined SSB (Non Cell Defining SSB, NCD-SSB) in the reduced capability initial bandwidth portion, i.e., an SSB that is not located on the synchronization raster, which indicates the same physical Cell identity (Physical Cell Identifier, PCI) as the PCI of the Cell-defined SSB (CD-SSB) located in Cell 1. The terminal device may thus detect the NCD-SSB broadcast by Cell1 in the reduced capability initial bandwidth portion, and the terminal device may also detect the NCD-SSB broadcast by other cells, such as Cell 2.

Then in step 102 and step 103, the terminal device has two cases in which the measured value of the synchronization signal measured in the reduced capability initial bandwidth part (i.e. the measured value of the NCD-SSB) is larger than the second measured value of the synchronization signal of the camping cell in the first case and smaller than or equal to the second measured value of the synchronization signal of the camping cell in the second case.

Specifically, the first measurement value and the second measurement value may be represented by reference signal received power (Reference Signal Receiving Power, RSRP) or reference signal received quality, which is only illustrated by way of example in this patent.

For the second case, i.e., NCD-SSB RSRP of Cell1 > =ncd-SSB RSRP of Cell2, the terminal device may continue to camp on Cell1, i.e., monitor pages in the reduced capability initial bandwidth portion of Cell1, or monitor pages in the normal initial bandwidth portion of Cell 1.

For the first case, i.e. NCD-SSB RSRP of Cell1 < NCD-SSB RSRP of Cell2, the terminal device may then perform step 102 or step 103.

In a specific implementation of step 102, the terminal device may determine whether to perform cell reselection based on the second measurement value. In other words, the terminal device only needs to pay attention to the second measurement value of the synchronization signal of the camping Cell, which means that the terminal device may not read the system message of other cells, such as Cell 2.

In one non-limiting embodiment, camping on the camping cell is continued if the second measurement value reaches (including being equal to) the first threshold. In this embodiment, the fact that the second measured value reaches the first threshold means that the signal quality of the resident cell in the capacity-reducing initial bandwidth portion is better, and the success rate of random access of the terminal equipment can be guaranteed to a certain extent, so that the terminal equipment can continue to reside in the current cell.

In another non-limiting embodiment, if the second measurement does not reach the first threshold, cell reselection is performed. In this embodiment, the second measurement value not reaching the first threshold (i.e. being smaller than the first threshold) means that the signal quality of the resident cell in the reduced capacity initial bandwidth portion is poor, and the terminal device continues to reside in the current cell, which results in the terminal device failing to randomly access, so that the terminal device performs cell reselection to reselect to the cell with better signal, thereby ensuring the success rate of random access.

In particular, the terminal device typically adopts a cell reselection strategy based on frequency priority in the cell reselection process. When planning a cell network, an operator divides all frequencies into a plurality of groups, and each group is allocated with a frequency priority. Each cell will broadcast its own frequency priority and the frequency priority of the frequency of the neighboring cell. If the cell on the high priority frequency meets the reselection condition, the terminal device needs to reselect to the cell on the high priority frequency. I.e. once the cell on the high frequency priority meets a preset threshold, such as Thresh _X,HighQ Or Thresh _X,HighP The terminal device needs to reselect to a high priority frequency.

For cells on the same frequency or on the same priority frequency, the terminal device needs to perform cell reselection according to the following ranking criteria of signal quality: computing R for serving cell _s ＝Q _meas,s +Qhyst, R is calculated for neighbor cells _n ＝Q _meas,n Qoffset, where s represents a serving cell, n represents a neighboring cell, Q _meas,s Indicating that the terminal equipment measures the RSRP, Q of the serving cell during the cell reselection _meas,n The method and the device indicate that the terminal equipment measures RSRP of the adjacent cells in the cell reselection process, qhyst indicates serving cell hysteresis, and Qoffset indicates offset values of the adjacent cells. For a serving cell, on-channel neighbor cell qoffset=qoffset _s,n Off-frequency neighbor qoffset=qoffset _s,n +Qoffset _frequency ，Qoffset _s,n Indicating offset, qoffset of cell level _frequency Representing the shift in frequency level. The terminal equipment sorts all R values of the cells on the same frequency priority, the cell ranked in the first position is the best cell, and the terminal equipment reselects to the best cell. Broadcasting Qhyst, qoffset and Qoffset in system message of serving cell _frequency After reading the system message, the terminal device obtains these parameters for cell reselection.

It should be noted that, the premise of the terminal device executing the ranking criteria is that the cells need to meet the criteria of cell Selection (Selection), that is, the S criteria of signal quality, which belongs to the prior art and is not described herein.

Further, the first threshold is carried in a system message of the camping cell. That is, the first threshold is configured by a system message of the camping cell, and in particular may be configured by SIB 1.

In a specific embodiment of step 103, the terminal device may perform cell reselection according to the comparison result of the frequency priority of the camping cell and the frequency priorities of the other cells and the first measurement value.

In this embodiment, the frequency priority of other cells (for example, the frequency priority greater than or less than the frequency priority of the resident cell) and the second measurement value of the synchronization signal of other cells need to be considered, so as to consider the frequency priority and the signal quality of the access cell of the terminal device.

In one non-limiting embodiment, if the comparison indicates that the frequency priority of the other cell is higher than or equal to the frequency priority of the camping cell, and the other cell is determined to be the strongest cell on the frequency to which the first measurement value belongs, then cell reselection is performed to reselect to the other cell.

Specifically, taking the application scenario shown in fig. 2 as an example, if the frequency priority of the frequency point F1 and the frequency point F2 are the same, or the frequency priority of the frequency point F1 is lower than the frequency priority of the frequency point F2, and the Cell2 is the Cell with the strongest signal on the frequency point F2, at this time, the terminal device reselects to the Cell2, and monitors paging in the reduced capability initial bandwidth portion configured by the Cell2 or in the normal initial bandwidth portion of the Cell2. Meanwhile, the Cell2 is the Cell with the strongest signal at the frequency point F2, and the condition to be met is that the signal quality of the Cell2 reaches a certain threshold, for example, the signal threshold for detecting SIB configuration is met, so that the terminal device can reside in the Cell2. Because the terminal equipment can only analyze the system information in the Cell2, the configured reduced capacity initial bandwidth part can be obtained, and if the terminal equipment has service requirements, the terminal equipment initiates random access in the reduced capacity initial bandwidth part, and the success rate of random access can be improved as long as the BWP used by the terminal equipment for initiating random access is ensured to be positioned in the strongest Cell.

The embodiment of the invention can ensure that the terminal equipment resides in the cell with higher frequency priority, preferably can also ensure that the terminal equipment resides in the cell with higher frequency priority and better signal, and improves the success rate of random access of the terminal equipment.

In another embodiment of step 103, the terminal device may determine whether to perform cell reselection according to the comparison result and the on-channel reselection parameter.

In particular implementations, the on-channel reselection parameter (IntraFreqReselection, IFRI) is used to indicate whether the terminal device is allowed to camp on the on-channel strong cell. For example, when the terminal device camps on the strongest Cell1 on the frequency point F1 and the same-frequency reselection parameter of the Cell1 is configured to be allowed, if the Cell1 is set to be forbidden (Barred) at this time, that is, the Cell1 is forbidden to camp, the terminal device may attempt to camp on other cells on the frequency point F1; when the on-channel reselection parameter of Cell1 is configured not to be allowed, if Cell1 is set to forbidden (Barred) at this time, that is, cell1 is forbidden to camp on, the terminal device cannot camp on other cells on F1 (assuming that the signal strength of other cells on F1 is still lower than Cell 1). The same-frequency reselection parameter is a parameter special for the terminal equipment with reduced capability.

In specific implementation, the system message of the cell, such as the parameters of the same frequency reselection parameters, are broadcasted in SIB 1.

In one non-limiting embodiment, if the co-frequency reselection parameter of the other cell indicates that the co-frequency strong cell is not allowed to reside, performing cell reselection according to the frequency priority of the cell to reselect to a cell with a frequency priority higher than the frequency priority of the resident cell, wherein the terminal device cannot continue to reside at the current frequency; if a reselection to a cell having a frequency priority higher than that of the resident cell is not made, an attempt is made to reselect to a cell having a frequency priority equal to or lower than that of the currently resident cell, and if there is a suitable cell, a cell reselection is performed.

In a specific implementation, taking the application scenario shown in fig. 2 as an example, if the frequency priority of the frequency point F1 is higher than the frequency priority of the frequency point F2, the terminal device measures that the strongest Cell on the frequency point F1 is still the Cell1. The terminal equipment acquires the same-frequency reselection parameter configured in the system message of the Cell2, and if the same-frequency reselection parameter is set to be allowed, the terminal equipment continuously resides in the initial bandwidth part of the Cell1 with reduced capability and continuously monitors paging; or continuously resides in the Cell1, and when the service requirement exists, the random access flow is developed through the initial bandwidth part of the reduced capacity of the Cell1, and the network is accessed.

If the on-channel reselection parameter of Cell2 is set to disallow, the terminal device needs to attempt to reselect to another Cell, such as to a Cell on another frequency point having a higher priority than frequency point F1, or to a Cell on the same frequency point as the frequency priority of F1. At this time, the terminal device prohibits reselection to the cell on the frequency point F1 for a certain period of time (e.g., 300 s). If there are no other cells that can be reselected, the terminal device reselects to the reduced capability initial bandwidth portion of Cell 2.

The embodiment of the invention can give consideration to the frequency priority of the cell and the signal quality of the cell on one hand, and ensure the success rate of access; on the other hand, cell reselection is performed according to the comparison result and the first measured value, so that the terminal equipment with reduced capability can be timely reselected to other suitable cells, and the access success rate is improved.

In one non-limiting embodiment of the invention, another cell reselection method is also disclosed. Referring to fig. 3, the cell reselection method may include the following steps:

step 301: measuring a first measurement of a synchronization signal of a camping cell in a first reduced capability initial bandwidth portion;

step 302: if the first measurement value indicates that the camping cell is not the strongest cell on the frequency to which it belongs, performing cell reselection according to a first frequency priority of the first reduced capability initial bandwidth portion, the camping cell comprising the first reduced capability initial bandwidth portion and a normal initial bandwidth portion, the first frequency priority being different from the frequency priority of the normal initial bandwidth portion.

It should be noted that, the cell reselection method in the embodiment of the present invention may be used at the terminal device side, that is, each step of the method may be performed by the terminal device. More specifically, the steps of the above method may be performed by a reduced capability terminal device.

In a specific implementation, the first measurement of the synchronization signal of the camping cell may be NCD-SSB RSRP.

Compared with the prior art that the reduced capability initial bandwidth part and the common initial bandwidth part have the same frequency priority, in the embodiment of the invention, the reduced capability initial bandwidth part has independent frequency priority, that is, the frequency priority of the reduced capability initial bandwidth part is different from the frequency priority of the common initial bandwidth part. On this basis, when the terminal device performs cell reselection, the terminal device may perform cell reselection according to the independent frequency priority of the reduced capability initial bandwidth portion.

The embodiment of the invention can enable the terminal equipment with reduced capability to have the opportunity to reselect to the strongest cell with higher frequency priority, thereby improving the success rate of access.

Further, step 302 may include the steps of: acquiring a second reduced capacity initial bandwidth part with a second frequency priority higher than the first frequency priority, wherein the second reduced capacity initial bandwidth part is positioned in a second cell; measuring a measurement of a second cell in a second reduced capability initial bandwidth portion; and if the second cell is determined to be the strongest cell on the affiliated frequency according to the second measured value, performing cell reselection to reselect to the second cell.

Specifically, referring to the application scenario shown in fig. 2, for Cell1 on frequency F1, the frequency priority of frequency F1 is P1. Two frequency priorities P1 and P2 are configured for the frequency in the system message, the priority P1 being the frequency priority of the normal initial bandwidth portion, the priority P2 being the frequency priority of the reduced capability initial bandwidth portion.

Likewise, for Cell2 located on frequency F2, frequency priority of frequency F2 is P3, and frequency priority P2 of the reduced capability initial bandwidth portion may be configured. For cells on other frequencies, such as Cell3 (its frequency priority P4), it is configured with a frequency priority P5 for the reduced capability initial bandwidth portion, which is located at a different frequency than the reduced capability initial bandwidth portion in fig. 2.

The terminal device selects a camping Cell, such as Cell1, according to the existing Cell reselection mechanism, and camps according to the reduced capability initial bandwidth portion indicated by Cell1. If the terminal device measures the NCD-SSB RSRP on the BWP, it is the largest on the frequency. The UE resides in Cell1. If the terminal device measures on the BWP that the NCD-SSB RSRP is not maximum on this frequency, the terminal device tries to find a cell on other frequencies with a higher priority than P2 that can be used for the terminal device to camp on. Assuming that P5 has a higher priority than P2, if the NCD-SSB RSRP of the reduced capability initial bandwidth portion configured by Cell3 is the largest, the terminal device reselects to Cell3. If the cell corresponding to the higher priority is not available, the terminal equipment tries to select the cell with the largest NCD-SSB RSRP in the same frequency priority for residence; if there is no suitable cell of the same frequency priority, the terminal device attempts to select the cell with the largest NCD-SSB RSRP on the frequency to camp on in the lower frequency priority.

Referring to fig. 4, the embodiment of the present invention further discloses a cell reselection device, where the cell reselection device 40 includes:

a detection module 401, configured to monitor, in a reduced capability initial bandwidth portion, a synchronization signal of a camping cell and synchronization signals of other cells, where the reduced capability initial bandwidth portion of the camping cell and the other cells have a frequency overlapping region;

a first cell reselection module 402, configured to perform cell reselection according to the comparison result of the frequency priority of the camping cell and the frequency priority of the other cell and the first measurement value, or determine whether to perform cell reselection according to the comparison result and the same frequency reselection parameter when the first measurement value of the synchronization signal of the other cell is greater than the second measurement value of the synchronization signal of the camping cell; or alternatively, the process may be performed,

a second cell reselection module 403 for determining whether to perform cell reselection based at least on the second measurement.

In the embodiment of the invention, whether to execute cell reselection is determined by the second measured value, if the second measured value is higher than (or equal to) a certain threshold, the cell is continued to reside in the current cell, so that the success rate of access can be ensured; in addition, cell reselection is performed according to the comparison result and the first measured value, so that the terminal equipment with reduced capability can be reselected to the strongest cell with higher frequency priority, and the access success rate is improved.

In a particular embodiment, the second cell reselection module 403 continues camping on the camping cell when the second measurement reaches the first threshold; the second cell reselection module 403 performs cell reselection when the second measurement value does not reach the first threshold.

In a specific embodiment, the first cell reselection module 402 performs cell reselection to the other cell when the comparison result indicates that the frequency priority of the other cell is higher than or equal to the frequency priority of the camping cell, and determines that the other cell is the strongest cell on the affiliated frequency according to the first measurement value.

In a specific embodiment, the first cell reselection module 402 determines whether to perform cell reselection according to the same frequency reselection parameter of the other cell when the comparison result indicates that the frequency priority of the other cell is lower than the frequency priority of the resident cell.

Further, the first cell reselection module 402 continues to camp on the camping cell when the co-frequency reselection parameters of other cells indicate that camping on the co-frequency strong cell is allowed. Otherwise, performing cell reselection according to the frequency priority of the cell to reselect to the cell with the frequency priority higher than the frequency priority of the resident cell; if reselection to a cell having a higher frequency priority than that of the resident cell is not possible, reselection to a suitable cell on the same or lower frequency is attempted, and if there is a suitable cell, cell reselection is performed to reselect to another cell.

For more details of the working principle and the working manner of the cell reselection device 40, reference may be made to the related descriptions of the embodiments in fig. 1 to 3, which are not repeated here.

In a specific implementation, the cell reselection device 40 may correspond to a Chip having a cell reselection function in a terminal device, for example, an SOC (System-On-a-Chip), a baseband Chip, etc.; or the terminal equipment comprises a chip module with a cell reselection function; or corresponds to a chip module having a chip with a data processing function or corresponds to a terminal device.

Referring to fig. 5, the embodiment of the present invention further discloses a cell reselection device, where the cell reselection device 50 includes:

a measurement module 501 for measuring a first measurement of a synchronization signal of a camping cell in a first reduced capability initial bandwidth portion;

a cell reselection module 502, configured to perform cell reselection according to a first frequency priority of a first reduced capability initial bandwidth portion if the first measurement value indicates that the camping cell is not the strongest cell on the frequency to which it belongs, where the camping cell includes the first reduced capability initial bandwidth portion and a normal initial bandwidth portion, and the first frequency priority is different from the frequency priority of the normal initial bandwidth portion.

In a specific implementation, the cell reselection device 50 may correspond to a Chip having a cell reselection function in a terminal device, for example, an SOC (System-On-a-Chip), a baseband Chip, etc.; or the terminal equipment comprises a chip module with a cell reselection function; or corresponds to a chip module having a chip with a data processing function or corresponds to a terminal device.

With respect to each of the apparatuses and each of the modules/units included in the products described in the above embodiments, it may be a software module/unit, a hardware module/unit, or a software module/unit, and a hardware module/unit. For example, for each device or product applied to or integrated on a chip, each module/unit included in the device or product may be implemented in hardware such as a circuit, or at least part of the modules/units may be implemented in software program, where the software program runs on a processor integrated inside the chip, and the rest (if any) of the modules/units may be implemented in hardware such as a circuit; for each device and product applied to or integrated in the chip module, each module/unit contained in the device and product can be realized in a hardware manner such as a circuit, different modules/units can be located in the same component (such as a chip, a circuit module and the like) or different components of the chip module, or at least part of the modules/units can be realized in a software program, the software program runs on a processor integrated in the chip module, and the rest (if any) of the modules/units can be realized in a hardware manner such as a circuit; for each device, product, or application to or integrated with the terminal, each module/unit included in the device, product, or application may be implemented by using hardware such as a circuit, different modules/units may be located in the same component (for example, a chip, a circuit module, or the like) or different components in the terminal, or at least part of the modules/units may be implemented by using a software program, where the software program runs on a processor integrated inside the terminal, and the remaining (if any) part of the modules/units may be implemented by using hardware such as a circuit.

The embodiment of the application also discloses a storage medium which is a computer readable storage medium and is stored with a computer program, and the computer program can execute the steps of the cell reselection method in the previous embodiment when running.

The embodiment of the application also discloses a terminal device, which can comprise a memory and a processor, wherein the memory stores a computer program capable of running on the processor. The processor may perform the steps of the cell reselection method in the previous embodiments when running the computer program. The terminal equipment comprises, but is not limited to, mobile phones, computers, tablet computers and other terminal equipment.

It should be understood that the term "and/or" is merely an association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In this context, the character "/" indicates that the front and rear associated objects are an "or" relationship.

The term "plurality" as used in the embodiments of the present application means two or more.

The first, second, etc. descriptions in the embodiments of the present application are only used for illustrating and distinguishing the description objects, and no order is used, nor is the number of the devices in the embodiments of the present application limited, and no limitation on the embodiments of the present application should be construed.

The "connection" in the embodiment of the present application refers to various connection manners such as direct connection or indirect connection, so as to implement communication between devices, which is not limited in the embodiment of the present application.

It should be appreciated that in the embodiment of the present application, the processor may be a central processing unit (central processing unit, abbreviated as CPU), and the processor may also be other general purpose processors, digital signal processors (digital signal processor, abbreviated as DSP), application specific integrated circuits (application specific integrated circuit, abbreviated as ASIC), off-the-shelf programmable gate arrays (field programmable gate array, abbreviated as FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

It should also be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically erasable ROM (electrically EPROM, EEPROM), or a flash memory. The volatile memory may be a random access memory (random access memory, RAM for short) which acts as an external cache. By way of example but not limitation, many forms of random access memory (random access memory, abbreviated as RAM) are available, such as static random access memory (static RAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, abbreviated as DDR SDRAM), enhanced Synchronous Dynamic Random Access Memory (ESDRAM), synchronous Link DRAM (SLDRAM), and direct memory bus random access memory (direct rambus RAM, abbreviated as DR RAM).

The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented in software, the above-described embodiments may be implemented in whole or in part in the form of a computer program product. The computer program product comprises one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired or wireless means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more sets of available media.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed method, apparatus and system may be implemented in other manners. For example, the device embodiments described above are merely illustrative; for example, the division of the units is only one logic function division, and other division modes can be adopted in actual implementation; for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may be physically included separately, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.

The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform part of the steps of the method according to the embodiments of the present invention.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. A method of cell reselection, comprising:

detecting synchronization signals of resident cells and synchronization signals of other cells in a reduced capacity initial bandwidth part, wherein the reduced capacity initial bandwidth part of the resident cells and the other cells have frequency superposition areas;

When the first measured value of the synchronous signal of the other cell is larger than the second measured value of the synchronous signal of the resident cell, executing cell reselection according to the comparison result of the frequency priority of the resident cell and the frequency priority of the other cell and the first measured value, or determining whether to execute cell reselection according to the comparison result and the same frequency reselection parameter;

or determining whether to perform cell reselection at least according to the second measurement value.

2. The cell reselection method of claim 1, wherein the determining whether to perform cell reselection based at least on the second measurement value comprises:

determining to camp on the camping cell or to perform cell reselection according to the second measurement value;

or determining to camp on the camping cell or performing cell reselection according to a second measurement value when the first measurement value of the synchronization signal of the other cell is larger than the second measurement value of the synchronization signal of the camping cell.

3. The method of cell reselection according to claim 2, wherein said determining to camp on the camping cell or performing cell reselection based on the second measurement value comprises:

If the second measured value reaches a first threshold, continuing to camp on the camping cell;

or if the second measurement value does not reach the first threshold, performing cell reselection.

4. A cell reselection method according to claim 3, characterized in that the first threshold is carried in a system message of the resident cell.

5. The method according to claim 1, wherein the performing cell reselection according to the comparison of the frequency priority of the camping cell and the frequency priorities of the other cells and the first measurement value comprises:

and if the comparison result shows that the frequency priority of the other cell is higher than or equal to the frequency priority of the resident cell, and the other cell is determined to be the strongest cell on the affiliated frequency according to the first measured value, performing cell reselection to reselect to the other cell.

6. The method according to claim 1, wherein the determining whether to perform cell reselection according to the comparison result and the on-channel reselection parameter comprises:

and if the comparison result shows that the frequency priority of the other cell is lower than that of the resident cell, determining whether to execute cell reselection according to the same-frequency reselection parameters of the other cell.

7. The method according to claim 6, wherein determining whether to perform cell reselection according to the on-channel reselection parameters of the other cell comprises:

if the same frequency reselection parameters of other cells indicate permission, continuing to camp on the camping cell.

8. The method according to claim 6, wherein determining whether to perform cell reselection according to the on-channel reselection parameters of the other cell comprises:

if the same frequency reselection parameter of other cells indicates disallowing, the cell reselection is performed according to the frequency priority of the cell.

9. A cell reselection apparatus, comprising:

the detection module is used for detecting the synchronous signals of the resident cell and the synchronous signals of other cells in the capacity-reduction initial bandwidth part, and the capacity-reduction initial bandwidth part of the resident cell and the other cells have frequency superposition areas;

a first cell reselection module, configured to execute cell reselection according to a comparison result of the frequency priority of the camping cell and the frequency priority of the other cell and the first measurement value, or determine whether to execute cell reselection according to the comparison result and a same frequency reselection parameter when a first measurement value of the synchronization signal of the other cell is greater than a second measurement value of the synchronization signal of the camping cell; or, a second cell reselection module, configured to determine whether to perform cell reselection at least according to the second measurement value.

10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, performs the steps of the cell reselection method of any one of claims 1 to 8.

11. A terminal device comprising a memory and a processor, the memory having stored thereon a computer program executable on the processor, characterized in that the processor, when executing the computer program, performs the steps of the cell reselection method of any one of claims 1 to 8.