CN110662265A

CN110662265A - Reselection access method, device and storage medium

Info

Publication number: CN110662265A
Application number: CN201810694912.1A
Authority: CN
Inventors: 鲜柯; 刘海君; 栗婵媛; 吕腾
Original assignee: Chengdu Dingqiao Communication Technology Co Ltd
Current assignee: Chengdu Dingqiao Communication Technology Co Ltd; TD Tech Chengdu Co Ltd
Priority date: 2018-06-29
Filing date: 2018-06-29
Publication date: 2020-01-07

Abstract

The application provides a reselection access method, a device and a storage medium, wherein the method comprises the following steps: acquiring a neighbor cell set of a serving cell, wherein the neighbor cell set comprises at least one neighbor cell, and the measurement result of each neighbor cell is greater than or equal to a preset cell reselection threshold; according to the cell list forbidden to be reselected and accessed, an adjacent cell subset allowing to be reselected and accessed is screened from the adjacent cell set, reselection parameters of cells in the cell list are larger than or equal to a preset threshold value, and the reselection parameters include any one of the following: reselecting access failure rate, reselecting access average time delay and service average interruption time delay; when the multicast service data is currently received and the neighbor cell subset has the neighbor cell which is receiving the multicast service data, taking the neighbor cell with the optimal measurement result in the neighbor cell which is receiving the multicast service data as a target cell; and executing a reselection access process on the target cell. The reselection access method, the reselection access device and the storage medium can improve the mobility performance of the multicast service data.

Description

Reselection access method, device and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method, an apparatus, and a storage medium for reselecting access.

Background

Broadband Trunking Communication (Btrunc) protocol is a private network broadband Trunking system standard based on Time Division Long Term Evolution (TD-LTE) "Long Term Evolution (LTE) digital transmission and trunked voice Communication". The Btrunc protocol is mainly standardized for broadband cluster service functions such as multicast service data voice, multicast service data video and multimedia multicast service data scheduling, has the characteristics of flexible bandwidth, high spectrum efficiency, low time delay, high reliability and the like, and can meet the use requirements of users. A network using the Btrunc protocol is called a Btrunc network.

When the network device sends the multicast service data to a group, the network device may broadcast the multicast service data of the group to all cells configuring the group, so that the terminal devices in the group may receive the multicast service data. The terminal devices in the group may be in an IDLE state or a connected state.

At present, when a terminal device in an IDLE state in a group receives multicast service data, if a neighboring cell meeting a cell reselection rule occurs, the terminal device may use the neighboring cell as a target cell and move to the target cell through a reselection access process. If a plurality of adjacent cells meeting the cell reselection rule exist currently, the terminal device may randomly select one adjacent cell as a target cell for access, which may cause the situation that the multicast service data of the terminal device is discontinuous, thereby reducing the mobility performance of the multicast service data.

Disclosure of Invention

The application provides a reselection access method, a reselection access device and a storage medium, which are used for improving the mobility performance of multicast service data.

A first aspect of the present application provides a method for reselecting access, including:

acquiring a neighbor cell set of a serving cell, wherein the neighbor cell set comprises at least one neighbor cell, and a measurement result of each neighbor cell is greater than or equal to a preset cell reselection threshold;

according to a cell list forbidden to be reselected and accessed, a neighbor cell subset allowing to be reselected and accessed is screened from the neighbor cell set, reselection parameters of cells in the cell list are greater than or equal to a preset threshold value, and the reselection parameters include any one of the following: reselecting access failure rate, reselecting access average time delay and service average interruption time delay;

when the multicast service data is currently received and the neighbor cell subset contains the neighbor cell which is receiving the multicast service data, taking the neighbor cell with the optimal measurement result in the neighbor cell which is receiving the multicast service data as a target cell;

and executing a reselection access process on the target cell.

In a possible embodiment, after the screening out the subset of neighboring cells allowed to be reselected for access from the set of neighboring cells, the method further includes:

when multicast service data is currently received and no neighbor cell which is receiving the multicast service data exists in the neighbor cell subset, taking the neighbor cell with the optimal measurement result in the neighbor cell subset as the target cell, and executing a reselection access process on the target cell;

or when the multicast service data is not received at present, taking the neighboring cell with the optimal measurement result in the neighboring cell subset as the target cell, and executing a reselection access process on the target cell.

In a possible embodiment, after performing the reselection access procedure on the target cell, the method includes:

acquiring a reselection access result of the target cell, wherein the reselection access result is a successful reselection access or a failed reselection access;

determining the value of the reselection parameter of the current target cell according to the reselection access result;

and when the value of the reselection parameter of the current target cell is greater than or equal to a preset threshold value, adding the target cell to the cell list.

In a possible implementation manner, the determining, according to the reselection access result, a value of the reselection parameter of the current target cell includes:

and determining the value of the current reselection access failure rate of the target cell according to the reselection access result and the reselection access result of the target cell which is accessed by the historical reselection.

In a possible implementation manner, the determining, according to the reselection access result and the reselection access result of the target cell reselected and accessed historically, a value of a current reselection access failure rate of the target cell includes:

acquiring the reselection access failure times of the target cell and the sum of the reselection access success times of the target cell and the reselection access failure times of the target cell according to the reselection access result and the reselection access result of the target cell accessed by the historical reselection;

and dividing the reselection access failure times of the target cell with the sum of the reselection access success times of the target cell and the reselection access failure times of the target cell to obtain the value of the reselection access failure rate of the current target cell.

determining reselection access time delay of current reselection access to the target cell according to the reselection access result;

and determining the value of the current reselection access average time delay of the target cell according to the reselection access time delay and the reselection access average time delay when the target cell is reselected and accessed for the previous time.

In a possible implementation manner, the determining, according to the reselection access result, a reselection access delay of currently reselecting to access the target cell includes:

when the reselection access result is that the reselection access is successful, taking the difference value between the finishing moment of the current reselection access to the target cell and the moment of triggering the reselection access to the target cell as the reselection access delay;

and when the reselection access result is reselection access failure, taking preset reselection access time delay as the reselection access time delay.

In a possible implementation manner, the determining, according to the reselection access delay and the average reselection access delay when the target cell was reselected and accessed for the previous time, a value of the average reselection access delay of the current target cell includes:

multiplying the reselection access delay by a first preset coefficient to obtain a first product;

multiplying the difference value between 1 and the first preset coefficient by the reselection access average time delay when the target cell is accessed by the previous reselection to obtain a second product;

and adding the first product and the second product to obtain the value of the average time delay of the reselection access of the current target cell.

In a possible implementation manner, the determining, according to the reselection access result, a value of the reselection parameter of the current target cell is determined as an average service interruption delay, and includes:

determining service interruption time delay when the current reselection is accessed to the target cell according to the reselection access result;

and determining the value of the current average interruption time delay of the service of the target cell according to the service interruption time delay and the average interruption time delay of the service when the target cell is reselected and accessed in the previous time.

In a possible implementation manner, the determining, according to the reselection access result, a service interruption delay when the target cell is reselected and accessed currently includes:

when the reselection access result is that the reselection access is successful, taking the difference value between the moment when the target cell starts to receive the multicast service data and the moment when the serving cell stops receiving the multicast service data as the service interruption time delay;

and when the reselection access result is reselection access failure, taking a preset service interruption time delay as the service interruption time delay.

In a possible implementation manner, the determining, according to the service interruption delay and the average service interruption delay when the target cell was reselected and accessed last time, a value of the average service interruption delay of the current target cell includes:

multiplying the service interruption time delay by a second preset coefficient to obtain a third product;

multiplying the difference value between 1 and the second preset coefficient by the average interruption time delay of the service when the target cell is accessed by the previous reselection to obtain a fourth product;

and adding the third product and the fourth product to obtain a value of the average service interruption time delay of the current target cell.

In one possible embodiment, after the adding the target cell to the cell name list, the method further comprises:

and when the time length of the target cell added to the cell list is longer than the preset time length, removing the target cell from the cell list.

A second aspect of the present application provides an apparatus for reselecting access, including:

a first obtaining module, configured to obtain a neighboring cell set of a serving cell, where the neighboring cell set includes at least one neighboring cell, and a measurement result of each neighboring cell is greater than or equal to a preset cell reselection threshold;

a screening module, configured to screen, according to a cell list prohibited from being reselected and accessed, a subset of neighboring cells allowed to be reselected and accessed from the neighboring cell set, where a reselection parameter of a cell in the cell list is greater than or equal to a preset threshold, where the reselection parameter includes any one of: reselecting access failure rate, reselecting access average time delay and service average interruption time delay;

the first processing module is used for taking the neighbor cell with the optimal measurement result in the neighbor cell receiving the multicast service data as a target cell when the multicast service data is currently received and the neighbor cell subset has the neighbor cell receiving the multicast service data;

and the access module is used for executing a reselection access process on the target cell.

In a possible implementation manner, the first processing module is further configured to, when multicast service data is currently being received and there is no neighbor cell in the subset of neighbor cells that is receiving the multicast service data, use a neighbor cell with an optimal measurement result in the subset of neighbor cells as the target cell, or, when multicast service data is not currently being received, use a neighbor cell with an optimal measurement result in the subset of neighbor cells as the target cell.

In a possible implementation, the apparatus further includes:

a second obtaining module, configured to obtain a reselection access result of the target cell after the access module performs a reselection access procedure on the target cell, where the reselection access result is a successful reselection access or a failed reselection access;

a determining module, configured to determine, according to the reselection access result, a value of a reselection parameter of the current target cell;

and the second processing module is used for adding the target cell to the cell list when the value of the reselection parameter of the current target cell is greater than or equal to a preset threshold value.

In a possible implementation manner, the reselection parameter is a reselection access failure rate, and the determining module is specifically configured to determine a value of the current reselection access failure rate of the target cell according to the reselection access result and a reselection access result of a historical reselection access to the target cell.

In a possible implementation manner, the determining module is specifically configured to obtain, according to the reselection access result and the reselection access result of the historical reselection access target cell, a number of times of reselection access failure of the target cell, a sum of the number of times of reselection access success of the target cell and the number of times of reselection access failure of the target cell, and divide the number of times of reselection access failure of the target cell and the sum of the number of times of reselection access success of the target cell and the number of times of reselection access failure of the target cell, so as to obtain a value of the current reselection access failure rate of the target cell.

In a possible implementation manner, the reselection parameter is an average reselection access time delay, and the determining module is specifically configured to determine, according to the reselection access result, a reselection access time delay of a current reselection access to the target cell, and determine, according to the reselection access time delay and an average reselection access time delay of a previous reselection access to the target cell, a value of the average reselection access time delay of the current target cell.

In a possible implementation manner, the determining module is specifically configured to, when the reselection access result is that the reselection access is successful, use a difference between a current time of completing the reselection access to the target cell and a time of triggering the reselection access to the target cell as the reselection access delay; and when the reselection access result is reselection access failure, taking a preset reselection access delay as the reselection access delay.

In a possible implementation manner, the determining module is specifically configured to multiply the reselection access delay by a first preset coefficient to obtain a first product, multiply a difference between 1 and the first preset coefficient by the reselection access average delay when the target cell is reselected and accessed last time to obtain a second product, and add the first product and the second product to obtain a value of the reselection access average delay of the current target cell.

In a possible implementation manner, the reselection parameter is an average service interruption delay, and the determining module is specifically configured to determine, according to the reselection access result, a service interruption delay when the current cell is reselected to access the target cell, and determine, according to the service interruption delay and the average service interruption delay when the previous cell is reselected to access the target cell, a value of the average service interruption delay of the current cell.

In a possible implementation manner, the determining module is specifically configured to, when the reselection access result is that the reselection access is successful, take a difference between a time when the target cell starts receiving the multicast service data and a time when the serving cell stops receiving the multicast service data as the service interruption delay; and when the reselection access result is reselection access failure, taking a preset service interruption time delay as the service interruption time delay.

In a possible implementation manner, the determining module is specifically configured to multiply the service interruption delay by a second preset coefficient to obtain a third product, multiply a difference between 1 and the second preset coefficient by the service average interruption delay when the target cell is reselected and accessed for the previous time to obtain a fourth product, and add the third product and the fourth product to obtain a value of the service average interruption delay of the current target cell.

In a possible implementation manner, the second processing module is further configured to remove the target cell from the cell list when a duration that the target cell is added to the cell list is greater than a preset duration.

A third aspect of the present application provides a computer readable storage medium having stored therein program instructions which, when executed by a processor, implement the method of any of the first aspects.

According to the reselection access method, the reselection access device and the storage medium provided by the application, the terminal device side is provided with the cell list for prohibiting reselection access, the cells in the cell list are the cells with high reselection access failure rate or the cells with long reselection access time, and when the terminal device executes a reselection process, the terminal device can screen out the neighboring cell subset which allows reselection access from the neighboring cell set meeting the cell reselection rule according to the name list of the cells which prohibit access. At this time, if the terminal device is receiving the multicast service data and there is a neighboring cell receiving the multicast service data in the neighboring cell subset, the terminal device takes the neighboring cell with the optimal measurement result in the neighboring cell receiving the multicast service data as a target cell, and executes a reselection access process. By the method for selecting the target cell, the condition that the multicast service data of the terminal equipment is discontinuous due to reselection access can be reduced, and the mobility performance of the multicast service data is improved.

Drawings

In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a block diagram of a communication system to which the present application relates;

fig. 2 is a schematic flowchart of a reselection access method provided in the present application;

fig. 3 is a schematic flowchart of another reselection access method provided in the present application;

fig. 4 is a schematic structural diagram of a reselection access apparatus provided in the present application;

fig. 5 is a schematic structural diagram of another reselection access device provided in the present application;

fig. 6 is a schematic structural diagram of another reselection access device provided in the present application.

Detailed Description

The technical solutions in the present application will be described clearly and completely with reference to the accompanying drawings in the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Fig. 1 is a block diagram of a communication system according to the present application. As shown in fig. 1, the communication system includes: network device 01 and terminal device 02. The network device 01 may send the multicast service data to the group where the terminal device 02 is located, so that the terminal device may receive the multicast service data. Wherein,

a network device: which may be a base station or various wireless access points, or may refer to devices in an access network that communicate over the air-interface, through one or more sectors, with terminal devices. The base station may be configured to interconvert received air frames and IP packets as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network. The base station may also coordinate management of attributes for the air interface. For example, the Base Station may be a Base Transceiver Station (BTS) in Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), a Base Station (NodeB, NB) in Wideband Code Division Multiple Access (WCDMA), an evolved Node B (eNB, eNodeB) in Long Term Evolution (Long Term Evolution, LTE), a relay Station or an Access point, or a Base Station gNB in a future 5G network, and the like, which are not limited herein.

The terminal equipment: which may be wireless or wireline, and which may be a device providing voice and/or other traffic data connectivity to a user, a handheld device having wireless connection capability, or other processing device connected to a wireless modem. Wireless terminals, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a Radio Access Network (RAN), which may exchange language and/or data with the RAN. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Terminal (Remote Terminal), an access Terminal (access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), and a User Equipment (User device User Equipment), which are not limited herein.

The network in which the above communication system is located may be referred to as a Btrunc network. When the network device sends the multicast service data to a group, the network device may broadcast the multicast service data of the group to all cells configuring the group, so that the terminal devices in the group may receive the multicast service data. The terminal devices in the group may be in an IDLE state or a connected state.

The terminal device in IDLE state in the group can move to the target cell through the reselection access process. Because the time consumption of the reselection access process is long, if the terminal device is receiving the multicast service data when executing the reselection access process, the multicast service data received by the terminal device will be discontinuous, and problems of multicast voice word loss, multicast video screen splash and the like will occur. In order to reduce the problem of long time consumption of the reselection access process, the Btrunc protocol restricts the network device to broadcast the group configuration information of the neighboring cell of the serving cell where the terminal device is located to the terminal device through a Trunking Control Channel (TCCH). Therefore, the terminal equipment knows which groups are configured for each neighboring cell through the group configuration information.

However, the Btrunc protocol only restricts the terminal device to select a neighboring cell that satisfies the cell reselection rule as the target cell, and does not restrict how to select the target cell for reselection access when there are multiple neighboring cells that satisfy the cell reselection rule. Therefore, in the prior art, the terminal device randomly selects a neighboring cell as a target cell for access. If the target cell is not configured with the group in which the terminal device is located, or the failure rate of the reselection access of the target cell is high, or the time consumption of the reselection access of the target cell is long, or the like, the situation that the multicast service data of the terminal device is discontinuous occurs, and the mobility performance of the multicast service data is reduced.

In view of the above problems, the present application provides a reselection access method, where a list of cells prohibited from reselection access is set on a terminal device side, where a cell in the list of cells is a cell consuming a long time for reselection access, and when a reselection process is executed by a terminal device, a subset of neighboring cells that are allowed to be reselected and accessed may be screened from a neighboring cell set that satisfies a cell reselection rule according to the list of the cells prohibited from access. At this time, if the terminal device is receiving the multicast service data and there is a neighboring cell receiving the multicast service data in the neighboring cell subset, the terminal device takes the neighboring cell with the optimal measurement result in the neighboring cell receiving the multicast service data as a target cell, and executes a reselection access process. By the method for selecting the target cell, the condition that the multicast service data of the terminal equipment is discontinuous due to reselection access can be reduced, and the mobility performance of the multicast service data is improved.

The technical solution of the present application will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

Fig. 2 is a schematic flowchart of a reselection access method provided in the present application. The embodiment relates to a process how a terminal device selects a target cell for reselection access when a plurality of adjacent cells meeting a cell reselection rule exist. As shown in fig. 2, the method includes:

s101, acquiring a neighbor cell set of a service cell, wherein the neighbor cell set comprises at least one neighbor cell, and a measurement result of each neighbor cell is greater than or equal to a preset cell reselection threshold.

S102, according to a cell list which is forbidden to be reselected and accessed, a neighboring cell subset which is allowed to be reselected and accessed is screened from a neighboring cell set, wherein reselection parameters of cells in the cell list are greater than or equal to a preset threshold value, and the reselection parameters comprise any one of the following: reselection access failure rate, average reselection access time delay and average service interruption time delay.

S103, judging whether the multicast service data is currently received. If yes, go to step S104, otherwise go to step S106.

S104, judging whether the neighbor cell subset has the neighbor cell receiving the multicast service data. If yes, go to step S105, otherwise go to step S106.

And S105, taking the neighbor cell with the optimal measurement result in the neighbor cells receiving the multicast service data as the target cell.

After S105 is executed, S107 is executed.

And S106, taking the neighbor cell with the optimal measurement result in the neighbor cell subset as a target cell.

And S107, performing reselection access process on the target cell.

After execution of S107, the flow ends.

Specifically, the terminal device may measure, in real time or periodically, the reference signal of the serving cell and the reference signals of the neighboring cells around the serving cell according to the neighboring cell configuration parameters in the system message, and obtain the measurement result of the serving cell and the measurement result of the neighboring cells around the serving cell. The measurement result is, for example, the received Power (RSRP) of the Reference signal or the received Quality (RSRQ) of the Reference signal.

When the terminal device obtains the measurement result of the serving cell and the measurement results of the neighboring cells around the serving cell, the measurement result of the serving cell may be compared with the measurement results of the neighboring cells around the serving cell. And when the measurement result of the adjacent cell is greater than the measurement result of the serving cell, determining that the adjacent cell meets the cell reselection rule. And when the measurement result of the adjacent cell is less than or equal to the measurement result of the serving cell, determining that the adjacent cell does not meet the cell reselection rule. Then, the terminal device may use the neighboring cell that satisfies the cell reselection rule as the neighboring cell set of the serving cell.

In this embodiment, the neighboring cell set includes at least two neighboring cells that satisfy a cell reselection rule. In order to reduce the time consumption of the terminal device for reselection access, the terminal device may first remove the cells in the neighboring cell set that are the same as the cell name list according to the cell list for which reselection access is prohibited, and screen out the neighboring cell subset for which reselection access is permitted. Wherein, the reselection parameter of the cell in the cell list is greater than or equal to a preset threshold, and the reselection parameter includes any one of the following: reselection access failure rate, average reselection access time delay and average service interruption time delay. That is, when the terminal device reselects a cell in the access cell list, the probability of the occurrence of reselection access failure is high, or the time consumed for reselection access is long. Therefore, by removing the cells identical to the cells on the cell name list from the neighboring cell set, it can be ensured that the terminal device can select the target cell for the reselection access from the neighboring cells with low probability of the reselection access failure or with short time consumption for the reselection access, so as to reduce the discontinuous situation of the multicast service data of the terminal device caused by the reselection access and improve the mobility performance of the multicast service data.

After the neighboring cell subset allowing reselection access is screened from the neighboring cell set, the terminal device may determine whether multicast service data is currently being received. If the terminal device is currently receiving the multicast service data, the terminal device may further determine whether there is an adjacent cell receiving the multicast service data in the adjacent cell subset. For example, the terminal device may obtain which neighboring cells in the subset of neighboring cells are configured with the group in which the terminal device is located, according to the group configuration information of the neighboring cells sent by the network device through the TCCH. Since the network device broadcasts the multicast service data of the group to all the cells configuring the group. Therefore, the terminal device can determine whether the neighbor cell which is receiving the multicast service data exists in the neighbor cell subset in this way.

If the neighbor cell subset includes the neighbor cell that is receiving the multicast service data, the terminal device may use the neighbor cell with the optimal measurement result in the neighbor cell that is receiving the multicast service data as the target cell. If there is no neighboring cell receiving the multicast service data in the neighboring cell subset, the terminal device may use the neighboring cell with the optimal measurement result in the neighboring cell subset as the target cell. By the method, when the neighbor cell receiving the multicast service data exists, the terminal equipment can take the neighbor cell with the optimal measurement result in the neighbor cell receiving the multicast service data as the target cell for reselection access. Because the group where the terminal device is located already exists in the target cell, the terminal device can directly continue to receive the multicast service data after reselecting and accessing the target cell, the situation that the multicast service data of the terminal device is discontinuous due to the fact that the target cell configures the group where the terminal device is located does not occur, and the mobility performance of the multicast service data is further improved.

If the terminal device does not receive the multicast service data currently, at this time, the multicast service of the terminal device is not affected by the reselection access of the terminal device, and in this scenario, the terminal device may directly take the neighbor cell with the optimal measurement result in the neighbor cell subset as the target cell to execute the reselection access process without determining whether the neighbor cell receiving the multicast service data exists in the neighbor cell subset.

It can be understood that, for how the terminal device performs the reselection access procedure on the target cell, reference may be made to the prior art, and details of which are not described herein again.

According to the reselection access method provided by the application, the terminal equipment side is provided with the cell list forbidden to be reselected and accessed, the cells in the cell list are the cells with high reselection access failure rate or long reselection access time, and when the terminal equipment executes a reselection process, the terminal equipment can screen out the neighbor cell subset allowed to be reselected and accessed from the neighbor cell set meeting the cell reselection rule according to the cell list forbidden to be accessed. At this time, if the terminal device is receiving the multicast service data and there is a neighboring cell receiving the multicast service data in the neighboring cell subset, the terminal device takes the neighboring cell with the optimal measurement result in the neighboring cell receiving the multicast service data as a target cell, and executes a reselection access process. By the method for selecting the target cell, the condition that the multicast service data of the terminal equipment is discontinuous due to reselection access can be reduced, and the mobility performance of the multicast service data is improved.

Fig. 3 is a flowchart illustrating another method for reselecting access according to the present application. As shown in fig. 3, further on the basis of the above method embodiment, the terminal device may further determine whether to add the target cell to a cell list prohibited from reselecting access based on a reselection access result of the target cell. Then after step S107, the method may further comprise:

s201, obtaining a reselection access result of the target cell, wherein the reselection access result is a successful reselection access or a failed reselection access.

S202, determining the value of the reselection parameter of the current target cell according to the reselection access result.

S203, judging whether the value of the reselection parameter of the current target cell is larger than or equal to a preset threshold value. If yes, go to step S204. If not, the process ends.

And S204, adding the target cell to a cell list.

After the execution of S204, the flow ends.

Specifically, after performing the reselection access procedure on the target cell, the terminal device may obtain a reselection access result of the target cell, for example, the reselection access is successful or the reselection access is failed. Then, the terminal device may determine a value of a reselection parameter of the current target cell according to the reselection access result.

When the reselection parameter is the reselection access failure rate and the preset threshold is the preset reselection access failure rate threshold, the terminal device may determine a value of the reselection access failure rate of the current target cell according to the reselection access result of this time and the reselection access result of the terminal device that has been reselected to access the target cell historically. The preset reselection failure rate threshold may be specifically set by the terminal device, for example, the preset reselection failure rate threshold may be 0.3.

For example, the terminal device may obtain the number of times of reselection access failure of the target cell, and the sum of the number of times of reselection access success of the target cell and the number of times of reselection access failure of the target cell according to the reselection access result of the reselected access target cell and the reselection access result of the historically reselected access target cell. Then, the terminal device may obtain a value of the reselection access failure rate of the current target cell according to the following formula (1).

Illustratively, the reselection access result of the terminal device reselecting the access target cell this time is successful reselection access, and the reselection access result of the terminal device historically reselecting the access target cell is successful 3 times and failed 4 times. That is, in addition to the reselection result of the terminal device reselecting the access target cell this time, if the terminal device reselects the access target cell 4 times in total and succeeds, and if the terminal device reselects the access target cell 4 times and fails, these values are substituted into the above formula 1, and the reselection access failure rate of the current target cell is 0.5.

Optionally, in some embodiments, the terminal device may also obtain the number of times of failed reselection and access failure of the target cell and the number of times of successful reselection and access success of the target cell according to the reselection and access result of the reselected and accessed target cell and the reselection and access result of the historically reselected and accessed target cell. Then, the terminal device may divide the number of times of the reselection access failure of the target cell and the number of times of the reselection access success of the target cell to obtain a value of the reselection access failure rate of the current target cell. The specific way of calculating the reselection access failure rate of the current target cell may be determined according to the definition of the reselection access failure rate of the current target cell.

If the reselection access failure rate of the current target cell is greater than or equal to the preset reselection access failure rate threshold, it indicates that the probability of failure of the terminal device in reselecting and accessing the target cell is high, and a situation that multicast service data is discontinuous when the terminal device in reselecting and accessing the target cell is likely to occur. In this scenario, the target cell may be added to a list of cells for which reselection access is prohibited. If the reselection access failure rate of the current target cell is smaller than the preset reselection access failure rate threshold, it indicates that the failure probability of the terminal device in reselecting and accessing the target cell is low, and the situation that multicast service data is discontinuous when the terminal device in reselecting and accessing the target cell is not caused. In this scenario, the target cell may not be added to the list of cells for which reselection access is prohibited.

It can be understood that, in some embodiments, the terminal device may calculate, according to the reselection access result, a value of the reselection access failure rate of the target cell when the number of times of performing reselection access on the target cell is greater than or equal to a preset number of times. When the number of times of performing reselection access on the target cell is less than the preset number of times, a value of the reselection access failure rate of the target cell may be defaulted to an initial value, and the initial value may be 1, for example.

When the reselection parameter is the average reselection access time delay and the preset threshold is the preset average reselection access time delay threshold, the terminal device may determine the reselection access time delay of the current reselection access target cell according to the reselection access result. Then, the terminal device may determine a value of the average reselection access time delay of the current target cell according to the reselection access time delay of the current reselection access target cell and the average reselection access time delay of the previous reselection access target cell. The preset reselection access average delay threshold may be specifically set by the terminal device, for example, the preset reselection access average delay threshold may be any value between 0 and 300 milliseconds (ms), for example, 100 ms.

If the reselection access result of the terminal device reselecting the access target cell this time is reselection access failure, the terminal device may determine that the reselection access delay of the current reselection access target cell is the preset reselection access delay. The preset reselection access delay may be specifically set by a terminal device, for example, the preset reselection access delay may be 200 ms. If the reselection access result of the terminal device reselecting and accessing the target cell is that the reselection access is successful, the terminal device may determine the reselection access delay of the current reselection access target cell according to the following formula (2).

Reselection access time (2) is the time when reselection access is completed and the reselection access is triggered

The reselection access finishing time is the finishing time of the current reselection access of the terminal equipment to the target cell, and the reselection access triggering time is the time of the triggering reselection access of the terminal equipment to the target cell.

Then, the terminal device may determine a value of the average reselection access time delay of the current target cell according to the reselection access time delay of the current reselection access target cell and the average reselection access time delay of the previous reselection access target cell. For example, the terminal device may multiply the reselection access delay of the current reselection access target cell by a first preset coefficient to obtain a first product. The terminal device may multiply the difference between 1 and the first preset coefficient by the average reselection access delay of the previous time of reselecting and accessing the target cell, so as to obtain a second product. Then, the terminal device may add the first product and the second product to obtain a value of the average time delay for reselecting and accessing the current target cell, which may specifically be shown in the following formula (3):

average time delay of reselecting access is alpha₁Reselection access time delay of current reselection access target cell + (1-alpha)₁) Average time delay of reselection access when previous reselection was accessed to target cell (3)

Wherein, the above-mentioned alpha₁Is a first predetermined coefficient, α₁The value of (a) can be specifically set by the terminal device, for example, the value of (a) is set by the terminal device₁May be 0.1. Alpha above₁The reselection access delay of the current reselection access target cell is a first product, namely (1-alpha)₁) And when the target cell is reselected and accessed in the previous time, the average time delay of reselected and accessed is a second product.

Optionally, in some embodiments, the terminal device may also multiply the difference between 1 and the first preset coefficient by the reselection access delay of the current reselection access target cell to obtain a first product. The terminal device may multiply the first preset coefficient by the reselection access average delay when the terminal device reselects and accesses the target cell for the previous time, to obtain a second product. Then, the terminal device may add the first product and the second product to obtain a value of the average time delay for reselecting and accessing the current target cell. The specific way of calculating the average time delay for reselecting and accessing the current target cell may be determined according to the definition of the average time delay for reselecting and accessing the current target cell.

If the average time delay of the reselection access of the current target cell is greater than or equal to the preset average time delay threshold of the reselection access, it indicates that the time delay of the terminal device for the reselection access to the target cell is relatively large, which is easy to cause the situation that multicast service data is discontinuous when the terminal device for the reselection access to the target cell. In this scenario, the target cell may be added to a list of cells for which reselection access is prohibited. If the average reselection access time delay of the current target cell is smaller than the preset average reselection access time delay threshold, it indicates that the time delay of the terminal device for reselecting and accessing the target cell is small, and the situation that multicast service data is discontinuous when the terminal device reselects and accesses the target cell cannot be caused. In this scenario, the target cell may not be added to the list of cells for which reselection access is prohibited.

When the reselection parameter is the average service interruption delay and the preset threshold is the preset average service interruption delay threshold, the terminal device may determine the service interruption delay when the current reselection is accessed to the target cell according to the reselection access result. Then, the terminal device may determine a value of the average service interruption delay of the current target cell according to the service interruption delay of the current reselected access target cell and the average service interruption delay of the previous reselected access target cell. The preset average service interruption delay threshold may be specifically set by a terminal device, for example, the preset average service interruption delay threshold may be any value between 0 and 500ms, for example, 100 ms.

For example, if the reselection access result of the terminal device reselecting and accessing the target cell this time is that the reselection access fails, the terminal device may determine that the service interruption time delay when the terminal device reselects and accesses the target cell at present is the preset service interruption time delay. The preset service interruption delay may be specifically set by a terminal device, for example, the preset service interruption delay may be 500 ms. If the reselection access result of the terminal device reselecting and accessing the target cell is that the reselection access is successful, the terminal device may determine the service interruption time delay when the terminal device reselects and accesses the target cell according to the following formula (4).

Service interruption time (4) when the target cell starts to receive the multicast service data and when the source cell stops receiving the multicast service data

The source cell is a service cell where the terminal device is located before reselecting to access the service cell.

Then, the terminal device may determine a value of the average service interruption delay of the current target cell according to the service interruption delay of the current reselected access target cell and the average service interruption delay of the previous reselected access target cell. For example, the terminal device may multiply the service interruption delay when the current reselection access target cell is multiplied by a second preset coefficient, so as to obtain a third product. The terminal device may multiply the difference between 1 and the second preset coefficient by the average interruption time delay of the service when the terminal device reselects and accesses the target cell at the previous time, so as to obtain a fourth product. The terminal device may add the third product and the fourth product to obtain a value of the average service interruption delay of the current target cell, which may be specifically shown in the following formula (5):

average interruption time delay of service is alpha₂Service interruption delay when current reselection is accessed to target cell + (1-alpha)₂) Average interruption time delay of service when previous reselection accessed target cell (5)

Wherein, the above-mentioned alpha₂Is a second predetermined coefficient, α₂The value of (a) can be specifically set by the terminal device, for example, the value of (a) is set by the terminal device₂May be 0.1. Alpha above₂The service interruption delay when the current reselection is accessed to the target cell is the third product, namely (1-alpha)₂) The average interruption time delay of the service when the target cell is accessed by the previous reselection is a fourth product.

Optionally, in some embodiments, the terminal device may also multiply the difference between 1 and the second preset coefficient by the service interruption delay when the current reselection access target cell is obtained, so as to obtain a third product. The terminal device may multiply the second preset coefficient by the average interruption time delay of the service when the terminal device reselects and accesses the target cell for the previous time, so as to obtain a fourth product. Then, the terminal device may add the third product and the fourth product to obtain a value of the average service interruption delay of the current target cell. The method for specifically calculating the average service interruption time delay of the current target cell may be determined according to the definition of the average service interruption time delay of the current target cell.

If the average service interruption time delay of the current target cell is greater than or equal to the preset average service interruption time delay threshold, it indicates that the service interruption time is longer when the terminal device reselects to access the target cell, which easily causes the situation that the multicast service data is discontinuous when the terminal device reselects to access the target cell. In this scenario, the target cell may be added to a list of cells for which reselection access is prohibited. If the average service interruption time delay of the current target cell is smaller than the preset average service interruption time delay threshold, it indicates that the service interruption time is short when the terminal device reselects to access the target cell, and the situation that the multicast service data is discontinuous when the terminal device reselects to access the target cell is not caused. In this scenario, the target cell may not be added to the list of cells for which reselection access is prohibited.

It can be understood that, if the terminal device does not receive the multicast service data when performing the reselection access procedure on the target cell, after performing the reselection access procedure on the target cell, the terminal device does not need to perform an operation of determining whether to add the target cell to the list of cells prohibited from reselection access according to the reselection access result of the target cell.

Optionally, in some embodiments, after adding the target cell to the cell list prohibited from reselecting and accessing, the terminal device may remove the target cell from the cell list when a duration that the target cell is added to the cell list is greater than a preset duration. For example, the terminal device may set a timer for the target cell when the target cell is added to the list of cells prohibited from reselecting and accessing, where the duration of the timer is a preset duration. And removing the target cell from the cell list when the timer of the target cell is timed out. In this way, the target cell may be prevented from persisting in the cell list.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Fig. 4 is a schematic structural diagram of a reselection access apparatus provided in the present application. The reselection access device may implement part or all of the terminal equipment through software, hardware or a combination of the two. The reselection access device can be a terminal device, and also can be a chip applied to the terminal device. As shown in fig. 4, the apparatus includes: a first obtaining module 11, a screening module 12, a first processing module 13 and an access module 14. Wherein,

a first obtaining module 11, configured to obtain a neighboring cell set of a serving cell, where the neighboring cell set includes at least one neighboring cell, and a measurement result of each neighboring cell is greater than or equal to a preset cell reselection threshold;

a screening module 12, configured to screen, according to a cell list prohibited from being reselected and accessed, a subset of neighboring cells allowed to be reselected and accessed from a neighboring cell set, where a reselection parameter of a cell in the cell list is greater than or equal to a preset threshold, and the reselection parameter includes any one of the following: reselecting access failure rate, reselecting access average time delay and service average interruption time delay;

a first processing module 13, configured to, when multicast service data is currently being received and a neighbor cell that is receiving the multicast service data exists in the neighbor cell subset, take a neighbor cell that has an optimal measurement result in the neighbor cell that is receiving the multicast service data as a target cell;

and an access module 14, configured to perform a reselection access procedure on the target cell.

In some embodiments, the first processing module 13 is further configured to, when multicast service data is currently being received and there is no neighbor cell in the neighbor cell subset that is receiving the multicast service data, use a neighbor cell with an optimal measurement result in the neighbor cell subset as the target cell, or, when multicast service data is not currently being received, use a neighbor cell with an optimal measurement result in the neighbor cell subset as the target cell.

Fig. 5 is a schematic structural diagram of another reselection access device provided in the present application. As shown in fig. 5, the apparatus may further include: a second acquisition module 15, a determination module 16 and a second processing module 17. Wherein,

a second obtaining module 15, configured to obtain a reselection access result of the target cell after the access module performs a reselection access procedure on the target cell, where the reselection access result is a successful reselection access or a failed reselection access;

a determining module 16, configured to determine, according to the reselection access result, a value of a reselection parameter of the current target cell;

a second processing module 17, configured to add the target cell to the cell list when the value of the reselection parameter of the current target cell is greater than or equal to a preset threshold.

For example, when the reselection parameter is a reselection access failure rate, the determining module 16 is specifically configured to determine a value of the current reselection access failure rate of the target cell according to the reselection access result and a reselection access result of the target cell that is historically reselected and accessed. For example, the determining module 16 is specifically configured to obtain, according to the reselection access result and the reselection access result of the historical reselection access to the target cell, a reselection access failure frequency of the target cell, a sum of the reselection access success frequency of the target cell and the reselection access failure frequency of the target cell, and divide the reselection access failure frequency of the target cell and the sum of the reselection access success frequency of the target cell and the reselection access failure frequency of the target cell to obtain a value of the current reselection access failure rate of the target cell.

When the reselection parameter is the average reselection access delay, the determining module 16 is specifically configured to determine, according to the reselection access result, the reselection access delay of the current reselection access to the target cell, and determine, according to the reselection access delay and the average reselection access delay of the previous reselection access to the target cell, a value of the average reselection access delay of the current target cell.

In this implementation, the determining module is specifically configured to, when the reselection access result is that the reselection access is successful, take a difference between a current time of completing the reselection access to the target cell and a time of triggering the reselection access to the target cell as the reselection access delay; and when the reselection access result is reselection access failure, taking a preset reselection access delay as the reselection access delay.

In this implementation, the determining module 16 is specifically configured to multiply the reselection access delay by a first preset coefficient to obtain a first product, multiply a difference between 1 and the first preset coefficient by the reselection access average delay when the target cell is reselected and accessed last time to obtain a second product, and add the first product and the second product to obtain a value of the reselection access average delay of the current target cell.

When the reselection parameter is the average service interruption delay, the determining module 16 is specifically configured to determine, according to the reselection access result, the average service interruption delay when the current cell is reselected to access the target cell, and determine, according to the service interruption delay and the average service interruption delay when the previous cell is reselected to access the target cell, a value of the average service interruption delay of the current cell.

In this implementation, the determining module 16 is specifically configured to, when the reselection access result is that the reselection access is successful, take a difference between a time when the target cell starts receiving the multicast service data and a time when the serving cell stops receiving the multicast service data as the service interruption delay; and when the reselection access result is reselection access failure, taking a preset service interruption time delay as the service interruption time delay.

In this implementation, the determining module 16 is specifically configured to multiply the service interruption delay by a second preset coefficient to obtain a third product, multiply a difference between 1 and the second preset coefficient by the service average interruption delay when the target cell is reselected and accessed last time to obtain a fourth product, and add the third product and the fourth product to obtain a value of the service average interruption delay of the current target cell.

In some embodiments, the second processing module 17 is further configured to remove the target cell from the cell list when a duration that the target cell is added to the cell list is greater than a preset duration.

The reselection access device provided by the present application may execute the actions of the terminal device in the foregoing method embodiments, and the implementation principle and technical effect are similar, which are not described herein again.

It should be noted that the above modules can be implemented in the form of software called by a processing element; or may be implemented in hardware. For example, the obtaining module may be a processing element separately set up, or may be implemented by being integrated in a chip of the apparatus, or may be stored in a memory of the apparatus in the form of program code, and a processing element of the apparatus calls and executes the functions of the processing unit. In addition, all or part of the units can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, the steps of the method or the units above may be implemented by hardware integrated logic circuits in a processor element or instructions in software.

For example, the above units may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), etc. For another example, when some of the above units are implemented in the form of a processing element scheduler code, the processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor that can call the program code. As another example, these units may be integrated together and implemented in the form of a system-on-a-chip (SOC).

Fig. 6 is a schematic structural diagram of another reselection access device provided in the present application. As shown in fig. 6, the communication apparatus may include: a processor 21 (e.g., CPU), a memory 22, a receiver 23, a transmitter 24; the receiver 23 and the transmitter 24 are both coupled to the processor 21, the processor 21 controlling the receiving action of the receiver 23, the processor 21 controlling the transmitting action of the transmitter 24; the memory 22 may include a random-access memory (RAM) and may further include a non-volatile memory (NVM), such as at least one disk memory, and the memory 22 may store various instructions for performing various processing functions and implementing the method steps of the present application. Optionally, the communication apparatus related to the present application may further include: a power supply 25, a communication bus 26, and a communication port 27. The receiver 23 and the transmitter 24 may be integrated in a transceiver of the communication device or may be separate transceiving antennas on the communication device. A communication bus 26 is used to enable communication connections between the elements. The communication port 27 is used for connection communication between the communication device and other peripherals.

In the present application, the memory 22 is used for storing computer executable program code, which includes instructions; when the processor 21 executes the instruction, the instruction causes the processor 21 of the communication apparatus to execute the processing action of the terminal device in the foregoing method embodiment, cause the receiver 23 to execute the receiving action of the terminal device in the foregoing method embodiment, and cause the transmitter 24 to execute the transmitting action of the terminal device in the foregoing method embodiment, which has similar implementation principles and technical effects, and is not described herein again.

The present application also provides a storage medium comprising: a readable storage medium and a computer program stored on the readable storage medium, the computer program being used for implementing the method for reselecting access described in the above embodiments.

The present application also provides a computer program product containing instructions which, when run on a computer, cause the computer to perform the above described method of reselecting access.

The foregoing is a preferred embodiment of the present application, which is not intended to be limiting in any way, and any simple modifications, equivalent variations and modifications made to the foregoing embodiment according to the technical spirit of the present application are within the scope of the present application.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for reselecting access, comprising:

and executing a reselection access process on the target cell.

2. The method of claim 1, wherein after the screening of the subset of neighboring cells from the set of neighboring cells that are allowed to reselect access, the method further comprises:

3. The method according to claim 1 or 2, wherein after performing the reselection access procedure on the target cell, the method comprises:

4. The method according to claim 3, wherein the reselection parameter is a reselection access failure rate, and the determining a value of the reselection parameter of the current target cell according to the reselection access result includes:

5. The method according to claim 4, wherein the determining a value of a current reselection access failure rate of the target cell according to the reselection access result and a reselection access result of a historical reselection access to the target cell comprises:

6. The method according to claim 3, wherein the reselection parameter is an average time delay of reselection access, and the determining a value of the reselection parameter of the current target cell according to the reselection access result includes:

7. The method of claim 6, wherein the determining, according to the reselection access result, a reselection access delay for currently reselecting to access the target cell comprises:

8. The method of claim 6, wherein the determining the value of the average reselection access delay of the current target cell according to the reselection access delay and the average reselection access delay of the previous target cell includes:

9. The method according to claim 3, wherein the reselection parameter is an average service interruption delay, and the determining a value of the reselection parameter of the current target cell according to the reselection access result includes:

10. The method of claim 9, wherein the determining a service interruption delay when the target cell is reselected and accessed currently according to the reselection access result comprises:

11. The method of claim 9, wherein the determining the value of the average service interruption delay of the current target cell according to the service interruption delay and the average service interruption delay of the previous reselection to access the target cell comprises:

12. The method of claim 3, wherein after the adding the target cell to the cell name list, the method further comprises:

13. An apparatus for reselecting access, the apparatus comprising:

14. The apparatus of claim 13, wherein the first processing module is further configured to, when multicast service data is currently being received and there is no neighbor cell in the subset of neighbor cells that is receiving the multicast service data, use a neighbor cell with an optimal measurement result in the subset of neighbor cells as the target cell, or, when multicast service data is not currently being received, use a neighbor cell with an optimal measurement result in the subset of neighbor cells as the target cell.

15. The apparatus of claim 13 or 14, further comprising:

16. The apparatus according to claim 15, wherein the reselection parameter is a reselection access failure rate, and the determining module is specifically configured to determine a value of the current reselection access failure rate of the target cell according to the reselection access result and a reselection access result of a historical reselection access to the target cell.

17. The apparatus according to claim 16, wherein the determining module is specifically configured to obtain, according to the reselection access result and the reselection access result of the historical reselection access to the target cell, a reselection access failure number of the target cell, a sum of the reselection access success number of the target cell and the reselection access failure number of the target cell, and divide the reselection access failure number of the target cell and the sum of the reselection access success number of the target cell and the reselection access failure number of the target cell to obtain a value of the current reselection access failure rate of the target cell.

18. The apparatus according to claim 15, wherein the reselection parameter is an average time delay for reselection access, and the determining module is specifically configured to determine, according to the reselection access result, a reselection access time delay for currently reselecting to access the target cell, and determine, according to the reselection access time delay and the average time delay for reselection access when the target cell was reselected to access last time, a value of the average time delay for current reselection access of the target cell.

19. The apparatus according to claim 18, wherein the determining module is specifically configured to, when the reselection access result is that the reselection access is successful, take a difference between a completion time of current reselection access to the target cell and a time of triggering reselection access to the target cell as the reselection access delay; and when the reselection access result is reselection access failure, taking a preset reselection access delay as the reselection access delay.

20. The apparatus of claim 18, wherein the determining module is specifically configured to multiply the reselection access delay by a first preset coefficient to obtain a first product, multiply a difference between 1 and the first preset coefficient by the reselection access average delay when the target cell was reselected and accessed last time to obtain a second product, and add the first product and the second product to obtain a value of the reselection access average delay of the current target cell.

21. The apparatus according to claim 15, wherein the reselection parameter is an average service interruption delay, and the determining module is specifically configured to determine, according to the reselection access result, a service interruption delay when the target cell is currently reselected for access, and determine, according to the service interruption delay and an average service interruption delay when the target cell is previously reselected for access, a value of the average service interruption delay of the target cell.

22. The apparatus according to claim 21, wherein the determining module is specifically configured to, when the reselection access result is a successful reselection access, use a difference between a time when the target cell starts receiving the multicast service data and a time when the serving cell stops receiving the multicast service data as the service interruption delay; and when the reselection access result is reselection access failure, taking a preset service interruption time delay as the service interruption time delay.

23. The apparatus of claim 21, wherein the determining module is specifically configured to multiply the service interruption delay by a second preset coefficient to obtain a third product, multiply a difference between 1 and the second preset coefficient by the service average interruption delay when the target cell is reselected and accessed for the previous time to obtain a fourth product, and add the third product and the fourth product to obtain a value of the service average interruption delay of the current target cell.

24. The apparatus of claim 15, wherein the second processing module is further configured to remove the target cell from the cell list when the duration of the target cell added to the cell list is longer than a preset duration.

25. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein program instructions, which when executed by a processor, implement the method of any one of claims 1-12.