CN109561466B

CN109561466B - Cell selection method, device and terminal equipment

Info

Publication number: CN109561466B
Application number: CN201910090578.3A
Authority: CN
Inventors: 杨金华
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2019-01-30
Filing date: 2019-01-30
Publication date: 2023-04-25
Anticipated expiration: 2039-01-30
Also published as: CN109561466A

Abstract

The embodiment of the invention discloses a cell selection method, a cell selection device and terminal equipment, wherein the method comprises the following steps: receiving a release message sent by network side equipment, wherein the release message carries at least one frequency point information; initiating a random access request in a target cell in a plurality of cells corresponding to the at least one frequency point information, and receiving congestion feedback; updating the channel parameters of the target cell, and selecting a cell based on the updated channel parameters. The method solves the problem that in the prior art, the network side possibly refuses the terminal access due to service congestion caused by that a plurality of users request to access the cell with the same signal and the best signal.

Description

Cell selection method, device and terminal equipment

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a cell selection method, a cell selection device and terminal equipment.

Background

When the network issues the frequency point information carried in the release message, relevant parameters of a network cell, such as psc (primary scrambling code, scrambling code information) and the like, are not specified, the terminal may search for a plurality of same-frequency cells in the area, then in the cells, the terminal may select the best cell, and currently the main chip merchant may select the cell with the best signal strength or signal quality through RSCP (received signal code power or signal strength), or ECNO (signal quality), and the actual service load of the cell is not considered.

However, when the user in the area may search the network after receiving the frequency point issued by the network during the voice service, the cell with the best signal finally searched is generally the same cell, so that the situation that many users all request to access the same cell may occur during busy hours, so that service congestion may occur at the network side, and rejection is caused by congestion during random access.

Disclosure of Invention

The embodiment of the invention provides a cell selection method, a cell selection device and terminal equipment, which are used for solving the problem that in the prior art, service congestion can possibly occur at a network side to reject terminal access due to the fact that a plurality of users request to access a cell with the same signal and the best signal.

In order to solve the technical problems, the invention is realized as follows:

in a first aspect, a cell selection method is provided, applied to a terminal device, and includes:

receiving a release message sent by network side equipment, wherein the release message carries at least one frequency point information;

initiating a random access request in a target cell in a plurality of cells corresponding to the at least one frequency point information, and receiving congestion feedback;

updating the channel parameters of the target cell, and selecting a cell based on the updated channel parameters.

In a second aspect, a cell selection apparatus is provided, which is applied to a terminal device, and includes:

the receiving unit is used for receiving a release message sent by the network side equipment, wherein the release message carries at least one frequency point information;

an access request initiating unit, configured to initiate a random access request in a target cell in a plurality of cells corresponding to the at least one frequency point information, where the receiving unit is configured to receive congestion feedback;

an updating unit, configured to update a channel parameter of the target cell;

and the selection unit is used for selecting the cell based on the updated channel parameters.

In a third aspect, there is also provided a terminal device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, which when executed by the processor, implements the steps of the method according to the first aspect.

In a fourth aspect, there is also provided a computer readable medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to the first aspect.

In the embodiment of the invention, after receiving a release message (carrying at least one frequency point information) sent by a network side device, a random access request is initiated in a target cell in a plurality of cells corresponding to the at least one frequency point information, and when congestion feedback is received, channel parameters of the target cell are updated, so that the cell is selected according to the updated channel parameters, and the random access request is initiated. Therefore, when a plurality of users all request to access the same cell with the best signal, the signal quality or the signal strength of the target cell with the best signal can be updated, and the cell with the best signal is reselected for random access according to a plurality of cells corresponding to the updated channel parameters, so that the users can have the opportunity to access other co-frequency cells (cells with slightly worse signal quality or signal strength than the target cell) in the area, and the problem that the network side possibly generates service congestion to reject the access of the terminal due to the fact that a plurality of users all request to access the same cell with the best signal in the prior art is solved.

Drawings

Fig. 1 is a schematic flow chart of voice traffic according to a random access cell in the prior art;

fig. 2 is a schematic flow chart of a cell selection method according to one embodiment of the invention;

fig. 3 is a schematic flow chart of a cell selection method according to another embodiment of the invention;

fig. 4 is a schematic flow chart of a cell selection method according to yet another embodiment of the invention;

fig. 5 is a schematic flow chart diagram of a cell selection method according to yet another embodiment of the invention;

fig. 6 is a schematic flow chart diagram of a cell selection method according to yet another embodiment of the invention;

fig. 7 is a schematic flow chart diagram of a cell selection method in accordance with a specific embodiment of the invention;

fig. 8 is a schematic block diagram of a cell selection apparatus according to an embodiment of the present invention;

fig. 9 is a schematic structural view of a terminal device according to an embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The following describes in detail the technical solutions provided by the embodiments of the present invention with reference to the accompanying drawings.

In the current LTE (Long Term Evolution ) network, part of the network has not deployed an IMS (IP Multimedia Subsystem ) network element providing a voice service, but does not support PS (Packet Switch) voice service, in this case, in order to ensure a voice call function of an LTE user, 3GPP makes a CSFB related standard, the user normally uses a data service in the LTE network, when the voice service is to be initiated (called), a CSFB procedure is triggered, the LTE network issues an rrc_release message, which carries redirection frequency point information, designates the user to a WCDMA (Wideband Code Division Multiple Access )/GSM (Global System for Mobile Communications, global system for mobile communication) cell frequency point for access, and after the terminal measures the frequency point at the bottom layer, selects a suitable cell for random access, and completes the voice call procedure in the CS network.

The random access is a process that the terminal keeps synchronization with the network side and establishes a wireless link when the terminal changes from an idle state to a connected state, and is a process that the terminal requests access to the network, receives a network response and allocates a random access channel. The terminal sends the RRC_Request information to the network side, the network side normally receives and replies the RRC_connection_setup or RRC_connection_reject message, and if the terminal receives the RRC_connection_setup_complete message, the terminal sends the RRC_connection_setup_complete message to complete the random access process.

In the CSFB procedure, if the rrc_release message sent by the LTE network carries W frequency point information, the terminal searches for a suitable cell on the corresponding frequency point, and then completes random access, and the specific flow can be seen in fig. 1.

When the network issues the frequency point information carried in the release message, the relevant parameters of the network cell are not specified, the terminal may search a plurality of same-frequency cells in the area, and then select the cell with the best (signal strength or signal quality). When the user in the area performs voice service, after receiving the frequency point issued by the network, the network searching is performed, and the cell with the best signal finally searched is generally the same cell, so that the situation that a plurality of users all request to access the same cell may occur, service congestion may occur at the network side, and when the user accesses randomly, the user access is not available due to the situation that the user is refused due to the congestion, and other cells with the same frequency in the area may be slightly bad due to the signal, but are idle.

In order to solve the above technical problems, as shown in fig. 2, an embodiment of the present invention provides a cell selection method, applied to a terminal device, including:

step 202, receiving a release message sent by the network side device, where the release message carries at least one frequency point information.

The release message is sent when the network side equipment receives the voice service of the terminal equipment, and the network where the network side equipment is located does not support the PS voice service.

Namely, the terminal equipment initiates a voice call (making a call) or receives a called party (receiving a call) in an LTE network cell, the LTE network issues a release message, and the terminal equipment interacts with each other in a 4G network through signaling messages. For example, the mobile phone and the network are in continuous communication with each other, the network can send a message to the mobile phone, so that the mobile phone can do what operation, and the mobile phone can report information to the network to tell the network about the current situation.

And 204, initiating a random access request in a target cell in a plurality of cells corresponding to the at least one frequency point information, and receiving congestion feedback.

Step 206, updating the channel parameters of the target cell, and selecting the cell based on the updated channel parameters.

Therefore, when a plurality of users all request to access the same cell with the best signal, the signal quality or the signal strength of the target cell with the best signal can be updated, and the cell with the best signal is reselected according to the updated channel parameters for random access, so that the users have the opportunity to access other co-frequency cells (cells with the slightly worse signal quality or signal strength than the target cell) in the area, and the problem that the network side possibly refuses the access of the terminal due to service congestion caused by the fact that a plurality of users all request to access the same cell with the best signal in the prior art is solved.

As shown in fig. 3, the operations before the target cell in the multiple cells corresponding to the at least one frequency point information initiates the random access request may include:

step 302, measuring channel parameters of a plurality of cells corresponding to at least one frequency point information. The channel parameters may include, among other things, signal quality (ECNO) or signal strength (RSCP).

Step 304, selecting a target cell, wherein the target cell is the cell with the best channel parameters in a plurality of cells.

The terminal equipment can measure the signal quality or the signal strength of the cell corresponding to the at least one frequency point information, and sort the signal quality or the signal strength of each cell according to the measured result so as to conveniently select the cell with the best signal strength or the best signal quality as a target cell for the terminal equipment to access.

In the above embodiment, as shown in fig. 4, updating the channel parameters of the target cell, and selecting the cell based on the updated channel parameters may include:

step 402, obtaining the target channel parameters according to the channel parameters of the target cell and the preset adjustment parameters.

Step 404, selecting a cell with the best channel parameter based on the target channel parameter and the channel parameters of other cells except the target cell in the cells corresponding to the at least one frequency point information.

After the target cell with the best signal strength or signal quality is measured, a plurality of users may request to access the target cell, so that the target cell may be blocked due to heavy traffic of the target cell, and meanwhile, other cells, particularly the cell with better signal quality or strength, but a cell with worse signal quality or strength (suboptimal cell) is idle compared with the target cell. At this time, the signal quality or signal strength of the target cell may be adjusted down (the target channel parameter is obtained according to the channel parameter of the target cell and the preset adjustment parameter), so as to reorder according to the signal quality or strength of the target cell after the adjustment (i.e. selecting the cell with the best channel parameter according to the target channel parameter and the channel parameters of other cells except the target cell among the cells corresponding to the at least one frequency point information), thereby selecting the suboptimal cell for the terminal device to access.

It should be noted that, after the channel parameters of the target cell are updated, the channel parameters of the target cell are likely to be lower than those of the suboptimal cell, and at this time, the suboptimal cell may be selected for the terminal device to access according to the updated comparison result of the channel parameters of the cells, so that the probability that other cells except the target cell are used for the terminal device to access may be improved.

Therefore, when a plurality of users all request to access the same cell with the best signal, the signal intensity or quality of the target cell with the best signal can be adjusted downwards (or updated), and the cell with the best signal is reselected from a plurality of cells corresponding to at least one frequency point information after the adjustment to carry out random access, so that the users have the opportunity to access other co-frequency cells (channel parameters are slightly worse than those of the target cell) in the area, and the problem that the network side possibly generates service congestion to reject the access of the terminal due to the fact that a plurality of users request to access the cell with the best signal in the prior art is solved.

In the above embodiment, selecting the cell with the best channel parameter based on the target channel parameter and the channel parameters of other cells than the target cell among the cells corresponding to the at least one frequency point information, includes:

if the channel parameters of the target channel and the channel parameters of the cells except the target cell in the cells corresponding to the at least one frequency point information are smaller than the preset threshold, selecting the cell with the best channel parameter based on the channel parameters of the cells corresponding to the at least one frequency point information. Or alternatively, the process may be performed,

if at least one of the channel parameters of the target channel and the channel parameters of other cells except the target cell in the plurality of cells corresponding to the at least one frequency point information is higher than a preset threshold, selecting the cell with the best channel parameter based on the target channel parameter and the channel parameters of the other cells except the target cell in the plurality of cells corresponding to the at least one frequency point information.

That is, when the signal quality or signal strength of the target cell is updated, the updated target cell and other cells (i.e., cells other than the target cell among the cells corresponding to the at least one frequency point information) are reordered, and the signal quality or strength between the updated target cell and the next-best cell (before update) is mainly compared. The updated target cell and the sub-optimal cell are compared, if the channel parameters of the sub-optimal cell and the target cell are lower than the preset threshold, the signal of the sub-optimal cell is relatively poor, and the sub-optimal cell is not suitable for the terminal equipment to access, so that the risk of the terminal equipment accessing to the congestion cell (the target cell) is lower than the risk of accessing to the sub-optimal cell with relatively poor signal. At this time, the original channel quality or strength (before updating) of the target cell can be compared with the channel quality or strength of other cells, and a suitable cell can be selected to initiate a random access request.

Of course, if the channel parameters of the target cell are not lower than the preset threshold after updating the channel parameters of the target cell, then the updated target cell or the suboptimal cell can be selected to initiate the random access request according to the comparison between the updated target cell and the suboptimal cell.

Therefore, selecting a cell with the best channel parameter based on the target channel parameter and channel parameters of other cells except the target cell in the plurality of cells corresponding to the at least one frequency point information may also include:

if the channel parameters of the updated target cell and the channel parameters of the suboptimal cell are smaller than the preset threshold, selecting a cell with the best channel parameters from a plurality of cells corresponding to at least one frequency point information to initiate a random access request, wherein the suboptimal cell is a cell with the channel parameters inferior to the target cell. Under the condition that the channel parameters of the updated target cell and the channel parameters of the suboptimal cell are smaller than a preset threshold, when a cell with the best channel parameters of the cell corresponding to at least one frequency point information is selected to initiate a random access request, the channel parameters of the cell corresponding to the at least one frequency point information need to be measured and sequenced again so as to select the cell with the best signal.

If the channel parameter of the updated target cell is higher than a preset threshold value or the channel parameter of the suboptimal cell is higher than the preset threshold value, selecting the cell with the best channel parameter from the updated target cell and the suboptimal cell to initiate a random access request.

Therefore, the method of the embodiment of the invention not only can enable the suboptimal cell to have the opportunity for the terminal equipment to carry out random access by updating the channel parameter of the target cell with the best signal, but also can avoid the condition that the terminal equipment accesses to the suboptimal cell with poor signal under the condition that the channel parameter of the suboptimal cell is not good. Therefore, in the area of busy service, the success rate of the call can be improved to a certain extent, so that the user can access to the suboptimal cell to complete the call, and the problem that the network side possibly refuses the terminal access due to service congestion caused by that a plurality of users all request to access the cell with the same signal best in the prior art is solved.

In any of the foregoing embodiments, as shown in fig. 5, after a random access request is initiated by a target cell in a plurality of cells corresponding to at least one frequency point information, and congestion feedback is received, the method may further include:

step 502, setting the duration of a target timer of a target cell as a preset time, starting the target timer, and adding the target cell into a preset list.

The preset list stores cells in which the terminal equipment initiates a random access request in preset time but receives congestion feedback. Whether a cell is busy or congested is determined by the network according to its corresponding load.

The frequency point information and the scrambling code information of the target cell can be added into a preset list.

Because the network side releases the frequency point information of the network included in the release message, the terminal equipment can search the scrambling code information according to the received corresponding frequency point information, namely the network informs the terminal equipment of which frequency point to go, the terminal equipment searches the frequency point, and then the signal quality or the intensity of the cell is calculated.

Since the network informs the terminal device that the frequency point information is only frequency point information and the scrambling code information is not accurate, the terminal device searches different cells in the frequency point information, such as a, B and C, for example, the frequency point information is 10833, the scrambling code information of the cell a is 3, the scrambling code information of the cell B is 6, and the scrambling code information of the cell C is 9. The network only informs the terminal device of searching on the frequency point removing information 10833, and the terminal device can search different cells with scrambling codes of 3,6 and 9 on the frequency point 10833 respectively.

Step 504, if the target timer times out, the target cell is deleted from the preset list.

Generally, the traffic status of each cell may be different in different time periods, for example, the target cell with the best signal has a relatively busy traffic in the first time period, and when the target cell is accessed, the random access request of the terminal device is likely to be rejected because of the blocking of the target cell, and at this time, the signal quality or strength of the target cell needs to be updated to select the suboptimal cell for the terminal device to access. And when the second time period is reached, the service of the target cell with the best possible signal is relatively less, at the moment, the access to the target cell is smooth, the problem of blockage is avoided, and at the moment, the signal quality or strength of the target cell is not required to be updated so as to select a suboptimal cell for the access of the terminal equipment. Therefore, a timer corresponding to the target cell needs to be set, and the timer is started to calculate whether the time of adding the target cell into the preset list is overtime, so that the cell in the preset list is cleared under the condition of overtime, and the next time the terminal equipment requests access is not affected. That is, when the cell with the best signal (e.g., the target cell) is added to the preset list due to traffic congestion, a timer may be set and started, and after a period of waiting, the terminal device may determine whether to update the signal quality or strength of the target cell according to the state of the timer when the terminal device re-initiates the random access request.

Specifically, the cell selection method further includes determining whether to update the signal quality or the signal strength of the target cell based on the state of the timer. As shown in fig. 6, specifically, the method includes:

if the timer is in a timeout state, the cell with the best channel parameter in the preset list is cleared, and a cell with the best channel parameter in a plurality of cells corresponding to at least one frequency point information is selected to initiate a random access request.

If the timer is in an overtime state, updating the channel parameters of the target cell, and selecting a cell with the best channel parameters to initiate a random access request based on the updated channel parameters of the target cell and the channel parameters of other cells except the target cell in a plurality of cells corresponding to at least one frequency point information.

It should be appreciated that the timer may be started after the best target cell for the signal is added to the pre-set list. When the terminal equipment re-initiates the access request (initiates the voice call), at this time, if the timer is timed out, it is indicated that the signal quality or strength of the target cell in the preset list may not be the best at the current moment, and even if the signal quality or strength of the target cell in the preset list is the best, the service of the target cell may not be busy at this time, so that the terminal equipment may access. Therefore, under the condition that the timer is overtime, the cell with the best signal quality or signal strength in the preset list can be cleared, and the cell with the best signal quality or signal strength in a plurality of cells corresponding to at least one frequency point information can be reselected to initiate a random access request.

If the timer does not timeout, the target cell is still the cell with the best signal and the service of the target cell is busy by default in the time period set by the timer, at this time, the signal quality or strength of the target cell can be adjusted downwards, so as to select the cell with the best signal quality or signal strength according to the adjusted signal quality or strength of the target cell and other cells (mainly the suboptimal cell) to initiate the random access request.

Generally, in the prior art, since the time of the penalty timer T302 at the network side may be short, and the timer generally only specifies that the terminal cannot access the cell within a specified time, the workflow regarding the timer in the prior art cannot be judged and optimized.

The method of the embodiment of the invention can determine whether to adjust the signal quality or strength of the target cell according to the state of the timer, so as to select the cell with the best signal according to the normal ordering mode or select the cell with the best signal according to the comparison relation between the target cell and other cells after the down regulation for the access of the terminal equipment under the different states of the timer. Therefore, the suboptimal cell can be provided with opportunities for the terminal equipment to perform random access, and the situation that the terminal equipment accesses to the suboptimal cell with poor signal is avoided under the condition that the signal quality or strength of the suboptimal cell is poor.

In any of the foregoing embodiments, updating the channel parameters of the target cell may include: subtracting a preset adjustment parameter (preset correction value) from the channel parameter of the target cell to obtain the target channel parameter (i.e. the updated channel parameter of the target cell).

The preset adjustment parameter may be a fixed value, for example, 3db, 3.1db, 3.2db, 4db, or the like. Alternatively, the preset adjustment parameter may be positively correlated with the number of times the cell appears in the preset list within a specified time. The specified time is greater than a preset time. For example, the timer is set for 5 seconds, the specified time is 1 minute, and the cell appears 1 time in the preset list within 1 minute, minus 3db; 2 occurrences, minus 6db, etc. In other words, the preset adjustment parameter may be set according to the comparison difference between the cells in different areas, which is not limited to a specific value or range of values.

As shown in fig. 7, the implementation procedure of the cell selection method according to the embodiment of the present invention may be:

first, the terminal initiates a voice call in an LTE cell or receives a called party.

And secondly, the LTE network transmits a release message carrying the WCDMA frequency point.

Thirdly, the terminal measures the frequency point information, sorts the frequency point information and selects an ECNO optimal cell A.

Fourth, a random access request is initiated at cell a, which replies to the rrc_reject message because of the busy traffic in this period of time and because of congestion.

Fifth, the terminal adds the information (frequency point and psc) of the cell to a busy list, and starts a timer B (timer times out, and the cell a information is cleared in the busy list).

Sixth, after waiting for a period of time, the voice call is re-initiated. Judging whether the timer is overtime, if so, clearing busy list, and selecting cell sorting according to normal condition (sorting the signal quality or strength of the cell corresponding to the frequency point information again to select the cell with the best signal).

Seventh, if the timer does not time out, x db is subtracted from the measured ECNO (signal quality) of cell A and then compared.

Eighth, the ECNO between the modified cells is compared, if the ECNO is lower than the C value (preset threshold), if the ECNO is lower than the C value, the signal quality of the next good cell is too bad, and the risk of accessing to the congested cell is not proper, so that the modified value is cancelled, the modified value is restored to the initial value for comparison, and the random access of the proper cell is selected. If the ECNO is not all lower than the C value, selecting a suitable cell according to the modified ECNO value.

It should be understood that, the method of the embodiment of the present invention mainly considers the fact that "the better coverage cell has higher traffic load and the less coverage cell is idle" exists in the real network, if the terminal side receives the rrc_reject message of the rejection cause of the congestion (cause 0), a timer is added, and during the timer period, when the signal strength or the signal quality of the cell is measured, the signal strength or the signal quality value of the cell with the best signal is subtracted to reduce the possibility that the cell is selected, and increase the possibility that the terminal selects other idle cells (suboptimal cells).

Meanwhile, considering that other common-frequency cells may have a particularly poor signal, a lowest threshold value C is set, and when the signal quality (after modification) of the cell finally reported is lower than the threshold value, in order to avoid random access failure, the risk that the congested cell may be refused again needs to be ignored, or the signal value before modification is used for comparison, and a proper cell is selected.

Considering different terminals, when selecting a suitable cell, the reference standards are different, and the ECNO (signal quality), or RSCP (signal strength) is the same based on the overall scheme of the ECNO and RSCP, except that the former judgment standard is based on signal quality measurement, and the latter is based on signal strength measurement.

Taking ECNO as an example, X and B and C are assumed values:

the cell A and the cell B belong to the same-frequency cell, the ECNO of the cell A is-15 db, the ECNO of the cell B is-19 db, when a random access request is initiated for the first time, the terminal selects the cell A (the signal quality is best), but the cell A is refused by network congestion, and the terminal adds the cell A into busy list. The timer B is 30 minutes, when the next terminal initiates the voice service, the ECNO measured by the cell A is-15 db, the ECNO of the cell B is-20 db after X (5 db) is subtracted, the ECNO of the cell B is still-19 db, and the modified ECNO values are lower than-18 db (C value), so that the quality of the next good cell is too bad, and in order to avoid other call problems, the values before modification are selected and compared under the scene (the ECNO of the cell A is still-15 db, and the ECNO of the cell B is still-19 db), and the cell A is still selected.

Of course, if the ECNO of the cell A is-10 db and the ECNO of the cell B is-14 db, during the second selection, the ECNO of the modified cell A is-15 db, so that the ECNO of the modified cell A and the ECNO of the cell B are both greater than-18 db (C value), but the ECNO of the cell B is greater than the ECNO of the modified cell A, so that the cell B is selected for the terminal to access for the second time.

Therefore, the channel parameters of the target cell with the best signal are updated, so that the suboptimal cell has the opportunity for the terminal equipment to perform random access, and the condition that the terminal equipment accesses to the suboptimal cell with poor signal is avoided under the condition that the channel parameters of the suboptimal cell are not good. Therefore, in the area of busy service, the success rate of the call can be improved to a certain extent, so that the user can access to the suboptimal cell to complete the call, and the problem that the network side possibly refuses the terminal access due to service congestion caused by that a plurality of users all request to access the cell with the same signal best in the prior art is solved.

In addition, the method of the embodiment of the invention can start from the CSFB process, and can perform certain optimization in the process of selecting the cell aiming at the WCDMA cell with busy service, and can also perform certain optimization by adopting a similar scheme in other processes, such as the process from the CSFB to the GSM network.

As shown in fig. 8, an embodiment of the present invention further provides a cell selection apparatus 800, which is applied to a terminal device, and includes: a receiving unit 802, configured to receive a release message sent by a network side device, where the release message carries at least one frequency point information; an access request initiating unit 804, configured to initiate a random access request in a target cell of a plurality of cells corresponding to at least one frequency point information, where the receiving unit 802 is further configured to receive congestion feedback; an updating unit 806, configured to update a channel parameter of the target cell; a selection unit 808 for selecting a cell based on the updated channel parameters.

After the cell selection apparatus 800 receives the release message (carrying at least one frequency point information) sent by the network side device through the receiving unit 802, the access request initiating unit 804 initiates a random access request in a target cell in a plurality of cells corresponding to the at least one frequency point information, and when the receiving unit 802 receives congestion feedback, the updating unit 806 updates the channel parameters of the target cell, so as to select a cell according to the updated channel parameters, and initiate the random access request. Therefore, when a plurality of users all request to access the same cell with the best signal, the signal quality or the signal strength of the target cell with the best signal can be updated, and the cell with the best signal is reselected for random access according to a plurality of cells corresponding to the updated channel parameters, so that the users can have the opportunity to access other co-frequency cells (cells with slightly worse signal quality or signal strength than the target cell) in the area, and the problem that the network side possibly generates service congestion to reject the access of the terminal due to the fact that a plurality of users all request to access the same cell with the best signal in the prior art is solved.

In the above embodiment, the cell selection apparatus 800 further includes a measurement unit 810 configured to measure a channel parameter of a cell corresponding to at least one frequency point information, where the channel parameter includes signal quality or signal strength. The selecting unit is used for selecting a target cell, wherein the target cell is a cell with the best channel parameters in a plurality of cells. The updating unit 806 is further configured to obtain the target channel parameter according to the channel parameter of the target cell and a preset adjustment parameter. The selecting unit 808 is further configured to select a cell with the best channel parameter to initiate a random access request based on the target channel parameter and channel parameters of other cells except the target cell among the multiple cells corresponding to the at least one frequency point information.

In this way, when many users all request to access the same cell with the best signal, the updating unit 806 may update the signal strength or quality of the target cell with the best signal, and the selecting unit 808 reselects the cell with the best signal from the cells corresponding to the updated at least one frequency point information to perform random access, so that the user may have a chance to access other co-frequency cells in the area (the signal quality is slightly worse than that of the target cell), which solves the problem that in the prior art, service congestion may occur on the network side due to the fact that many users all request to access the cell with the best signal.

In the further embodiment described above, the selection unit 808 is further configured to: if the channel parameters of the target channel and the channel parameters of the other cells except the target cell in the cells corresponding to the at least one frequency point information are smaller than a preset threshold value, selecting a cell with the best channel parameters based on the channel parameters of the cells corresponding to the at least one frequency point information; or if at least one of the channel parameters of the cells except the target cell in the plurality of cells corresponding to the at least one frequency point information is higher than the preset threshold value, selecting the cell with the best channel parameter based on the target channel parameter and the channel parameters of the cells except the target cell in the plurality of cells corresponding to the at least one frequency point information. The updating unit 806 is further configured to subtract the preset adjustment parameter (i.e. the preset correction value) from the channel parameter of the target cell to obtain an updated channel parameter of the target cell. The preset adjustment parameter may be a fixed value, or the preset adjustment parameter may be a positive correlation with the number of times that the cell appears in the preset list within a specified time, where the specified time is greater than the preset time, or the preset adjustment parameter may be set according to a comparison difference between the cells in different areas, which is not limited to a specific value or a range of values.

It should be understood that, by updating the signal quality or strength of the target cell with the best signal, not only can other cells, such as the suboptimal cell, have a chance to be accessed by the terminal device randomly, but also the situation that the terminal device accesses to the suboptimal cell with poor signal is avoided under the condition that the signal quality or strength of the suboptimal cell is not good. Therefore, in the area of busy service, the success rate of the call can be improved to a certain extent, so that the user can access to the suboptimal cell to complete the call, and the problem that the network side possibly refuses the terminal access due to service congestion caused by that a plurality of users all request to access the cell with the same signal best in the prior art is solved.

The apparatus of the embodiment of the present invention further includes a control unit 812, configured to set a duration of a target timer of the target cell to be a preset time, start the target timer, and add the target cell to a preset list. The preset list stores cells in which the terminal equipment initiates a random access request in preset time but receives congestion feedback.

In different time periods, the traffic states of the cells may be different, for example, the target cell with the best signal has a busy traffic in the first time period, and when the target cell is accessed, the random access request of the terminal device is likely to be refused because of the blockage of the target cell, and at this time, the signal quality or strength of the target cell needs to be updated to select a suboptimal cell for the terminal device to access. And when the second time period is reached, the service of the target cell with the best possible signal is relatively less, at the moment, the access to the target cell is smooth, the problem of blockage is avoided, and at the moment, the signal quality or strength of the target cell is not required to be updated so as to select a suboptimal cell for the access of the terminal equipment.

Through setting the timer, the cells added to the preset list can be deleted according to the state of the timer, or whether the channel parameters of the cells corresponding to the timer are updated can be directly determined according to the state of the timer. Therefore, under different states of the timer, the cell with the best signal can be selected according to the normal ordering mode or the cell with the best signal can be selected for the terminal equipment to access according to the comparison relation between the updated target cell and other cells. Therefore, the suboptimal cell can be provided with opportunities for the terminal equipment to perform random access, and the situation that the terminal equipment accesses to the suboptimal cell with poor signal is avoided under the condition that the signal quality or strength of the suboptimal cell is poor.

Fig. 9 is a schematic diagram of a hardware structure of a terminal device implementing an embodiment of the present invention. As shown in fig. 9, the terminal device 900 includes, but is not limited to: radio frequency unit 901, network module 902, audio output unit 903, input unit 904, sensor 905, display unit 906, user input unit 907, interface unit 908, memory 909, processor 910, and power source 911. It will be appreciated by those skilled in the art that the terminal device structure shown in fig. 9 does not constitute a limitation of the terminal device, and the terminal device may comprise more or less components than shown, or may combine certain components, or may have a different arrangement of components. In the embodiment of the invention, the terminal equipment comprises, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted terminal, a wearable device, a pedometer and the like.

Wherein the processor 910 is configured to perform the following method:

After receiving a release message (carrying at least one frequency point information) sent by a network side device, the method of the embodiment of the invention initiates a random access request in a target cell in a plurality of cells corresponding to the at least one frequency point information, and updates a channel parameter of the target cell when congestion feedback is received, so as to select a cell according to the updated channel parameter and initiate the random access request. Therefore, when a plurality of users all request to access the same cell with the best signal, the signal quality or the signal strength of the target cell with the best signal can be updated, and the cell with the best signal is reselected for random access according to a plurality of cells corresponding to the updated channel parameters, so that the users can have the opportunity to access other co-frequency cells (cells with slightly worse signal quality or signal strength than the target cell) in the area, and the problem that the network side possibly generates service congestion to reject the access of the terminal due to the fact that a plurality of users all request to access the same cell with the best signal in the prior art is solved.

It should be understood that, in the embodiment of the present invention, the radio frequency unit 901 may be used for receiving and transmitting signals during the process of receiving and transmitting information or communication, specifically, receiving downlink data from a base station and then processing the downlink data by the processor 910; and, the uplink data is transmitted to the base station. Typically, the radio frequency unit 901 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 901 may also communicate with networks and other devices via a wireless communication system.

The terminal device provides wireless broadband internet access to the user via the network module 902, such as helping the user to send and receive e-mail, browse web pages, access streaming media, etc.

The audio output unit 903 may convert audio data received by the radio frequency unit 901 or the network module 902 or stored in the memory 909 into an audio signal and output as sound. Also, the audio output unit 903 may also provide audio output (e.g., a call signal reception sound, a message reception sound, etc.) related to a specific function performed by the terminal device 900. The audio output unit 903 includes a speaker, a buzzer, a receiver, and the like.

The input unit 904 is used to receive an audio or video signal. The input unit 904 may include a graphics processor (Graphics Processing Unit, GPU) 9041 and a microphone 9042, the graphics processor 9041 processing image data of still pictures or video obtained by an image capturing device (such as a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 906. The image frames processed by the graphics processor 9041 may be stored in memory 909 (or other storage medium) or transmitted via the radio frequency unit 901 or the network module 902. The microphone 9042 may receive sound and may be capable of processing such sound into audio data. The processed audio data may be converted into a format output that can be transmitted to the mobile communication base station via the radio frequency unit 901 in the case of a telephone call mode.

The terminal device 900 also comprises at least one sensor 905, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the display panel 9061 according to the brightness of ambient light, and the proximity sensor can turn off the display panel 9061 and/or the backlight when the terminal device 900 moves to the ear. As one of the motion sensors, the accelerometer sensor can detect the acceleration in all directions (generally three axes), and can detect the gravity and direction when the accelerometer sensor is stationary, and can be used for recognizing the gesture (such as horizontal and vertical screen switching, related games, magnetometer gesture calibration), vibration recognition related functions (such as pedometer and knocking) and the like of the terminal equipment; the sensor 905 may further include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., where the infrared sensor is capable of measuring a distance between an object and a terminal device by transmitting and receiving infrared light, which is not described herein.

The display unit 906 is used to display information input by a user or information provided to the user. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display (Liquid Crystal Display, LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 907 is operable to receive input numeric or character information and to generate key signal inputs related to user settings and function controls of the terminal device. In particular, the user input unit 907 includes a touch panel 9071 and other input devices 9072. Touch panel 9071, also referred to as a touch screen, may collect touch operations thereon or thereabout by a user (such as operations of the user on touch panel 9071 or thereabout using any suitable object or accessory such as a finger, stylus, or the like). The touch panel 9071 may include two parts, a touch detection device and a touch controller. The touch detection device detects the touch azimuth of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 910, and receives and executes commands sent by the processor 910. In addition, the touch panel 9071 may be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. The user input unit 907 may also include other input devices 9072 in addition to the touch panel 9071. In particular, other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which are not described in detail herein.

Further, the touch panel 9071 may be overlaid on the display panel 9061, and when the touch panel 9071 detects a touch operation thereon or thereabout, the touch operation is transmitted to the processor 910 to determine a type of touch event, and then the processor 910 provides a corresponding visual output on the display panel 9061 according to the type of touch event. Although in fig. 9, the touch panel 9071 and the display panel 9061 are two independent components to implement the input and output functions of the terminal device, in some embodiments, the touch panel 9071 and the display panel 9061 may be integrated to implement the input and output functions of the terminal device, which is not limited herein.

The interface unit 908 is an interface to which an external device is connected to the terminal apparatus 900. For example, the external devices may include a wired or wireless headset port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. The interface unit 908 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the terminal device 900 or may be used to transmit data between the terminal device 900 and an external device.

The memory 909 may be used to store software programs as well as various data. The memory 909 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, application programs (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory 909 may include high-speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.

The processor 910 is a control center of the terminal device, connects various parts of the entire terminal device using various interfaces and lines, and performs various functions of the terminal device and processes data by running or executing software programs and/or modules stored in the memory 909 and calling data stored in the memory 909, thereby performing overall monitoring of the terminal device. Processor 910 may include one or more processing units; preferably, the processor 910 may integrate an application processor that primarily handles operating systems, user interfaces, applications, etc., with a modem processor that primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 910.

The terminal device 900 may also include a power supply 911 (e.g., a battery) for powering the various components, and the power supply 911 may preferably be logically coupled to the processor 910 by a power management system, such as to perform charge, discharge, and power consumption management functions via the power management system.

In addition, the terminal device 900 includes some functional modules, which are not shown, and will not be described herein.

Preferably, the embodiment of the present invention further provides a terminal device, which may include a processor 910, a memory 909, and a computer program stored in the memory 909 and capable of being executed on the processor 910, where the computer program is executed by the processor 910 to implement each process of the method embodiments shown in fig. 2 to fig. 7 and achieve the same technical effects, and for avoiding repetition, a description is omitted herein.

The embodiment of the present invention further provides a computer readable storage medium, on which a computer program is stored, where the computer program when executed by a processor implements each process of the methods shown in fig. 2 to 7 and achieves the same technical effects, and in order to avoid repetition, a description is omitted here. Wherein the computer readable storage medium is selected from Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.

It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.

The foregoing is merely exemplary of the present invention and is not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are to be included in the scope of the claims of the present invention.

Claims

1. A cell selection method, applied to a terminal device, comprising:

updating the channel parameters of the target cell, and selecting a cell based on the updated channel parameters;

after a target cell in a plurality of cells corresponding to the at least one frequency point information initiates a random access request and receives congestion feedback, the method further comprises:

setting the duration of a target timer of the target cell as preset time, starting the target timer, and adding the target cell into a preset list;

the preset list stores cells in which the terminal equipment initiates a random access request in the preset time but receives congestion feedback;

If the target timer is overtime, deleting the target cell from the preset list;

updating the channel parameters of the target cell, and selecting a cell based on the updated channel parameters, comprising:

obtaining a target channel parameter according to the channel parameter of the target cell and a preset adjustment parameter;

if the channel parameters of the target channel parameter and the channel parameters of other cells except the target cell in the cells corresponding to the at least one frequency point information are smaller than a preset threshold value, selecting a cell with the best channel parameter based on the channel parameters of the cells corresponding to the at least one frequency point information; or alternatively, the process may be performed,

and if at least one of the channel parameters of the cells except the target cell in the cells corresponding to the at least one frequency point information is higher than the preset threshold value, selecting the cell with the best channel parameter based on the channel parameters of the target channel and the channel parameters of the cells except the target cell in the cells corresponding to the at least one frequency point information.

2. The method of claim 1, wherein prior to a target cell of the plurality of cells corresponding to the at least one frequency point information initiating a random access request, comprising:

Measuring channel parameters of a plurality of cells corresponding to the at least one frequency point information, wherein the channel parameters comprise signal quality or signal strength;

and selecting the target cell, wherein the target cell is the cell with the best channel parameter in the cells.

3. A cell selection apparatus, applied to a terminal device, comprising:

an updating unit, configured to update a channel parameter of the target cell;

a selection unit for selecting a cell based on the updated channel parameters;

the control unit is used for setting the duration of a target timer of the target cell as preset time, starting the target timer and adding the target cell into a preset list;

The control unit is further configured to delete the target cell from the preset list if the target timer expires;

the updating unit is used for obtaining target channel parameters according to the channel parameters of the target cell and preset adjustment parameters;

the selecting unit is further configured to select, if the channel parameters of the target channel parameter and the channel parameters of the cells other than the target cell among the cells corresponding to the at least one frequency point information are all smaller than a preset threshold, a cell with a best channel parameter based on the channel parameters of the cells corresponding to the at least one frequency point information; or alternatively, the process may be performed,

4. A device according to claim 3, further comprising:

a measurement unit, configured to measure channel parameters of a plurality of cells corresponding to the at least one frequency point information, where the channel parameters include signal quality or signal strength;

The selecting unit is configured to select the target cell, where the target cell is a cell with a best channel parameter among the multiple cells.

5. A terminal device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, which when executed by the processor carries out the steps of the method according to any one of claims 1 to 2.

6. A computer readable medium, characterized in that it has stored thereon a computer program which, when executed by a processor, implements the steps of the method according to any of claims 1 to 2.