WO2011103823A2

WO2011103823A2 - Method and terminal for avoiding cell pingpong reselection

Info

Publication number: WO2011103823A2
Application number: PCT/CN2011/072910
Authority: WO
Inventors: 刘珺
Original assignee: 华为技术有限公司
Priority date: 2011-04-18
Filing date: 2011-04-18
Publication date: 2011-09-01
Also published as: WO2011103823A3; CN102204344B; CN102204344A

Abstract

A method for avoiding cell pingpong reselection is disclosed in the present invention, which comprises: cells which are able to be candidate serving cells are selected, according to an S criteria, from current serving cells and adjacent non-serving cells; an optimal cell is determined, according to an R criteria, from the candidate serving cells; if the optimal cell is not the current serving cell, it is determined that whether the signal intensity and the signal quality of the optimal cell are greater than or equal to reselection thresholds, wherein the reselection thresholds are greater than the minimum serving thresholds of the serving cell; and in the condition that the signal intensity and the signal quality of the optimal cell are greater than or equal to reselection thresholds, the cell reselection is initiated. The embodiments of the present invention also provide a corresponding terminal. Since the reselection thresholds of the cell reselection are increased in the solution of the present invention, the cells with good signal intensity and bad signal quality or the cells with bad signal intensity and good signal quality will not be within the candidate range of the reselection cells, and thus the cell pingpong reselection is avoided to occur frequently effectively.

Description

Method and terminal for avoiding ping-pong reselection in cell

The present invention relates to the field of communication technologies, and in particular, to a method and a terminal for avoiding ping-pong reselection in a cell.

Background technique

Compared to traditional voice services, today's mobile communication systems offer a richer range of services. In particular, the Universal Mobile Telecommunication System (UMTS), as a third-generation mobile communication system, uses Wideband Code Division Multiple Access (WCDMA) on the basis of the GSM system (WCDMA, Wideband). Code Division Multiple Access), which provides packet-based text, digital voice, video and multimedia data services to mobile and computer end users around the world at rates greater than 21 Mbps.

The UMTS system includes a core network (CN, Core Network) and multiple radio network subsystems (RNS, Radio Network Subsystem). The RNS constitutes a UMTS terrestrial radio access network (UTRAN). Each RNS has a radio network controller (RNC) and a plurality of base station nodes (NodeBs). Each RNC is responsible for giving it Each of the controlled NodeBs allocates radio resources, and the NodeB provides the radio resources to the user equipment (UE, User equipment). The radio resources are configured on a cell basis, and one cell is covered by a radio resource provided by the NodeB. The UE establishes a wireless channel for transmitting and receiving data by using the radio resources of the cell in which it is located.

When the UE does not establish a dedicated radio channel, if it moves from one cell to another, a cell reselection will be triggered. In the process of cell reselection, the UE measures the signal strength and signal quality received from the neighboring cells, compares the signal strengths, and finally selects a cell. The purpose of cell reselection is to accurately find the best cell in which a UE can camp and obtain service.

In order to perform cell reselection, the UE first acquires a neighbor cell list including the same frequency cell, the inter-frequency cell, and the different system cell. This list is obtained by the system information block received on the broadcast channel of the serving cell. Thereafter, the UE measures signal strength and signal quality of the neighboring cells, and calculates a signal strength S value and a signal quality S value of the neighboring cell, and a signal strength R value or a signal quality R value; The signal strength S value is the difference between the signal strength of the neighboring cell measured by the UE and the lowest signal strength required for cell selection; the signal quality S value is the signal quality of the neighboring cell measured by the UE and the minimum signal quality required for cell selection. The difference between the signal strength R value is the difference between the signal strength measurement value of the cell selection and reselection and the cell reselection hysteresis signal strength; the signal quality R value is the signal quality measurement value of the cell selection and reselection and the cell reselection hysteresis The difference in signal quality.

A cell with a signal strength S value and a signal quality S value greater than the signal strength S minimum value and the signal quality S minimum value can enter the rank of the candidate serving cell, and the signal strength S minimum value and the signal quality S minimum value are the monthly good service cells. The best ^ 氐 month good service threshold.

If multiple cells satisfy the requirements of the serving cell, the UE selects one of the best cells as the serving cell. The specific method is: the UE determines whether the calculated signal strength R value or the signal quality R value is obtained by using the system information block received on the broadcast channel of the serving cell, and sorts the calculated signal strength R value or the signal quality R value according to the size relationship. A cell having a maximum signal strength R value or a signal quality R value is used as a target cell for reselection.

The signal quality of a cell is mainly determined by the degree of interference of other cells using the same frequency point. The signal strength of the cell is mainly determined by the distance of the UE from the NodeB. In this way, the signal strength is weaker in the cell area away from the NodeB, but if the distances of other cells using the same frequency point are relatively long, the interference from other cells is relatively small, so the signal quality may still be in these places. Better.

If the UE calculates the signal strength R value through the judgment of the system information block received on the broadcast channel of the serving cell, after the reselection occurs, the UE enters a serving cell with the best signal strength (recorded as the A cell). However, the signal quality of the A cell is very weak, so that after the A cell becomes the serving cell, its signal quality S value cannot meet the minimum signal quality S of the serving cell, the UE must reselect, and select a signal quality S value to satisfy the service. The cell required by the cell (denoted as B cell), in the following time, by calculating and sorting the signal strength R value, the A cell becomes the cell with the best signal strength again, and the UE reselects to the A cell, and then The signal quality S value does not meet the requirements of the serving cell, and is reselected to the B cell. This repeated ping-pong effect appears.

When the UE calculates the signal quality R value through the judgment of the system information block received on the broadcast channel of the serving cell, after the reselection occurs, the UE enters a serving cell with the best signal quality (remember It is a C cell), but the signal strength of the C cell is very weak, so that after the C cell becomes a serving cell, its signal strength S value cannot meet the minimum signal strength S of the serving cell, and the UE must reselect and select a signal. The cell whose strength S value satisfies the requirements of the serving cell (referred to as D cell), the latter principle is the same as that of the A cell and the B cell in the upper segment, and the ping-pong effect of the C cell and the D cell also appears.

When performing cell reselection, the UE needs to open the radio frequency transceiver circuit to receive the system information sent by the NodeB on the broadcast channel, and also needs to open other circuit logics to perform necessary operations. This will increase UE power consumption and shorten standby time. When the ping-pong effect is reselected, the power consumption will be more serious. Therefore, ping pong reselection needs to be avoided in UMTS.

In order to avoid the cell reselection of the ping-pong effect, one of the existing technical solutions adds a hysteresis Qhyst to the signal strength R value or the signal quality R value of the serving cell, and the signal strength R value and signal quality of the neighboring cell. The offset amount Qoffset is subtracted from the R value. So that once the UE selects one cell as the serving cell, even if the signal strength R value or the signal quality R value of the serving cell is lower than the neighboring cell, as long as the phase difference does not exceed the amount controlled by Qhyst and Qoffset, the UE will not A cell reselection occurs.

The prior art scheme 2 is a time limit for cell reselection. After sorting the signal strength R value or the signal quality R value of each cell, if the cell with the highest signal strength R value or the signal quality R value is not the serving cell, the UE does not immediately perform cell reselection, but waits for a period of time Treselection Only during this Treselection time, the R value of the cell is always higher than the serving cell, and the UE performs cell reselection.

Since the signal strength S value and the signal quality S value are both greater than the signal strength S minimum value and the signal quality S minimum value, it is a necessary condition for the UE to select a cell as a serving cell. If the request of the serving cell cannot be satisfied, the UE must immediately Perform cell reselection. For a cell with the signal strength R value or the signal quality R value corrected by the prior art, if the signal strength S value and the signal quality S value cannot satisfy the signal strength S minimum value and the signal quality S minimum value, The UE still cannot use it as a serving cell and must reselect it immediately. The second technical solution is to avoid the frequent occurrence of the ping-pong effect by increasing the waiting time Treselection and then determining whether to initiate the cell reselection after the cell whose ranking is the largest R value is not the serving cell, but the signal strength S value and the signal The quality S value is greater than the signal strength S minimum value and the signal quality S minimum value is whether the UE can select a cell As a necessary condition for the serving cell, if the signal strength S value and the signal quality S value of the serving cell cannot satisfy and are greater than the signal strength S minimum value and the signal quality S minimum value, the UE still has to perform new cell selection immediately, without Subject to the Trelsection. Summary of the invention

The embodiments of the present invention provide a method and a terminal for avoiding ping-pong reselection in a cell, which can effectively avoid frequent occurrence of ping-pong reselection in a cell.

A method for avoiding ping-pong reselection in a cell, comprising:

Selecting a cell that can serve as a candidate serving cell from the current serving cell and the neighboring non-serving cell according to the S criterion, where the S criterion is that the signal strength and the signal quality are greater than or equal to the lowest service threshold of the serving cell;

Determining an optimal cell in the candidate serving cell according to the R criterion, where the R criterion is to sort all cells whose signal strength and signal quality are greater than or equal to the lowest service threshold of the serving cell according to signal strength or signal quality;

If the optimal cell is not the current serving cell, it is determined whether the signal strength and signal quality of the optimal cell are greater than or equal to a reselection threshold, and the reselection threshold is higher than a minimum service threshold of the serving cell;

In the case where the signal strength and signal quality of the optimal cell are greater than or equal to the reselection threshold, cell reselection is initiated.

A terminal, comprising:

a selecting unit, configured to select, according to the S criterion, a cell that can serve as a candidate serving cell from a current serving cell and a neighboring non-serving cell, where the S criterion is that the signal strength and the signal quality are greater than or equal to a minimum serving threshold of the serving cell;

a determining unit, configured to determine, according to an R criterion, an optimal cell in the candidate serving cell selected by the selecting unit, where the R criterion is to perform the candidate serving cell selected by the selecting unit according to signal strength or signal quality Sort

a determining unit, configured to determine, when the optimal cell determined by the determining unit is not the current serving cell, whether the signal strength and the signal quality of the optimal cell are greater than or equal to a reselection threshold, where the reselection threshold is higher than the service Minimum service threshold of the community; And a reselecting unit, configured to start cell reselection if the signal strength and signal quality of the optimal cell determined by the determining unit are greater than or equal to a reselection threshold.

The embodiment of the invention improves the reselection threshold of the cell reselection, so that the signal strength is good, but the signal quality is poor, or the signal strength is poor, and the cell with good signal quality does not enter the candidate range of the reselected cell, thereby effectively avoiding The frequent occurrence of ping-pong reselection in the community. DRAWINGS

1 is a schematic flow chart of a method according to Embodiment 1 of the present invention;

2 is a schematic flowchart of a method according to Embodiment 2 of the embodiment of the present invention;

3 is a schematic diagram of an embodiment of an apparatus according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of another embodiment of an apparatus according to an embodiment of the present invention. detailed description

Embodiments of the present invention provide a method for avoiding cell ping-pong reselection in a cell that can achieve good signal strength but poor signal quality, or poor signal strength and good signal quality, and does not enter the candidate range of the reselected cell. The embodiment of the present invention further provides a corresponding terminal for avoiding cell ping-pong reselection. The following is a detailed description. Embodiment 1 Referring to FIG. 1 , a method for avoiding ping-pong reselection in a cell according to Embodiment 1 of the present invention includes:

101. Select, according to the S criterion, a cell that can serve as a candidate serving cell from a current serving cell and a neighboring non-serving cell, where the S criterion is that the signal strength and the signal quality are greater than or equal to a minimum service threshold of the serving cell;

The signal strength S minimum value and the signal quality S minimum value are the minimum service threshold S criteria satisfying the serving cell. The signal strength S value of the cell is greater than or equal to the signal strength S minimum value of the serving cell, and the signal quality S value of the cell is greater than or equal to The serving cell signal quality S is the minimum; only the signal strength S value and the signal quality S value in the current serving cell and the neighboring cell are greater than or equal to the minimum serving threshold of the serving cell, and can be used as the candidate serving cell.

102. Determine, according to the R criterion, an optimal cell in the candidate serving cell, where the R criterion is that the cell with all signal strength and signal quality greater than or equal to the lowest service threshold of the serving cell is according to the signal strength or the letter. Sort the quality of the number;

The R criterion includes: all cells whose signal strength S value is greater than or equal to the signal strength S minimum value of the serving cell and whose signal quality S value is greater than or equal to the signal quality S minimum value of the serving cell are sorted according to the signal strength R value or the signal quality R value;

Based on the existing communication protocol specification, the terminal can generally obtain the candidate cell and the optimal cell in such a manner: Obtain a list of neighbor cells including the same frequency cell, the inter-frequency cell, and the different system cell, and the list is adopted. Obtaining the system information block received on the broadcast channel of the serving cell; then the terminal measures the signal strength and signal quality of the current serving cell and each neighboring cell in the neighbor cell list;

According to the measured signal strength and signal quality, the S value and the R value calculation formula are used to calculate the signal strength S value and the signal quality S value and the signal strength R value or the signal quality R value of each adjacent cell;

The specific case of determining the optimal cell in the candidate serving cell according to the R criterion is that the cell whose signal strength S value is greater than or equal to the minimum value of the signal strength S and the signal quality S value is greater than or equal to the minimum value of the signal quality S according to the signal strength R value or signal The quality R values are sorted, and the cell with the highest signal strength R value or the signal quality R value is determined as the optimal cell;

The terminal calculates the signal strength R value or the signal quality R value is determined by the system information block received on the broadcast channel of the serving cell, and the system information block carries information for calculating the signal strength R value or the signal quality R value, and the system The information block carries only one of the information, so the terminal only calculates one R value and only sorts one R value.

103. If the optimal cell is not the current serving cell, determine whether the signal strength and signal quality of the optimal cell are greater than or equal to the reselection threshold, and the reselection threshold is higher than the minimum service threshold of the serving cell; if the reselection threshold is greater than or equal to Go to step 104, if it is less, go to step 105;

The reselection threshold includes signal strength S reselection value and signal quality S reselection value, signal strength S reselection value is greater than the serving cell signal strength S minimum value, signal quality S reselection value is greater than the serving cell signal quality S minimum value;

Determining whether the signal strength S value and the signal quality S value of the optimal cell satisfy the reselection threshold, specifically determining whether the signal strength S value of the optimal cell is greater than or equal to the S reselection value of the signal strength, and simultaneously It is also determined whether the signal quality s value of the optimal cell is greater than or equal to the s reselection value of the signal quality.

104. Start cell reselection if the signal strength and signal quality of the optimal cell are greater than or equal to a reselection threshold.

The signal strength S value and the signal quality S value of the optimal cell are greater than or equal to the reselection threshold, including: the signal strength S value of the optimal cell is greater than or equal to the signal strength S reselection value, and the signal quality S value of the optimal cell It is greater than or equal to the signal quality S reselection value; if both conditions are satisfied at the same time, the cell reselection is initiated, and the optimal cell is used as the reselected target cell.

105. If the signal strength S value and the signal quality S value of the optimal cell do not satisfy the reselection threshold, the cell reselection is not started;

Optimal cell signal strength S value and signal quality S value does not meet the reselection threshold including three conditions, specifically:

The optimal cell signal strength S value is greater than or equal to the signal strength S reselection value, but the optimal cell signal quality S value is smaller than the signal quality S reselection value;

The optimal cell signal strength S value is smaller than the signal strength S reselection value, but the optimal cell signal quality S is greater than or equal to the signal quality S reselection value;

The signal strength S of the optimal cell is smaller than the signal strength S reselection value, and the signal quality S of the optimal cell is smaller than the signal quality S reselection value;

For the above three cases, the terminal does not initiate cell reselection and continues to camp on the current serving cell. In this embodiment, it is required to determine whether the signal strength and signal quality of the optimal cell meet the reselection threshold, and the reselection threshold is higher than the lowest service threshold of the serving cell; only the signal strength and signal quality of the optimal cell satisfy the reselection In the case of a threshold, cell reselection is initiated; compared to the prior art, this embodiment improves the reselection threshold of signal strength and signal quality, so that some signal strength is good but signal quality is poor, or signal quality A cell that is very good but has poor signal strength does not enter the candidate range of the reselected cell, effectively avoiding the occurrence of the ping-pong effect.

At the same time, the reduction of the number of times of ping-pong reselection in the cell also effectively reduces the power consumption of the terminal and prolongs the standby time.

The above embodiment is described by taking the reselection of the signal strength and signal quality of the optimal cell to satisfy the reselection threshold as an example. In fact, the signal strength and signal quality of the optimal cell satisfy the reselection threshold. It is also possible to delay the reselection for a while, and then the situation in which the delay is for a while is described in detail in the second embodiment. Referring to FIG. 2, a second embodiment of a method for avoiding cell ping-pong reselection in an embodiment of the present invention includes:

201. Select, according to the S criterion, a cell that can serve as a candidate serving cell from the current serving cell and the neighboring non-serving cell, and the S criterion is that the signal strength and the signal quality are greater than or equal to the minimum service threshold of the serving cell.

202. Determine an optimal cell in the candidate serving cell according to the R criterion, and the R criterion is to sort all cells whose signal strength and signal quality are greater than or equal to the lowest service threshold of the serving cell according to signal strength or signal quality.

For descriptions of 201 and 202, reference may be made to 101 and 102 in the first embodiment.

203. If the optimal cell is not the current serving cell, determine whether the signal strength and signal quality of the optimal cell are greater than or equal to the reselection threshold, and further include starting a check timer, and checking that the timer running time is preset. Check time T;

The inspection time T can be any value from 1 second to several tens of seconds, and the value of the inspection time T can be adjusted. 204. Determine whether the signal strength S value and the signal quality S value of the optimal cell are always greater than or equal to the reselection threshold within the time T during which the check timer is running, and the reselection threshold is higher than the minimum service threshold of the serving cell; T is always greater than or equal to the reselection threshold, step 205 is performed, if it is not always greater than or equal to the reselection threshold, step 206 is performed;

Determining whether the signal strength and signal quality of the optimal cell are always greater than or equal to the reselection threshold within the time T during which the check timer is running includes continuously determining whether the signal strength S value of the optimal cell is always greater than or equal to the check timer running time. The signal strength S is reselected, and it is continuously determined whether the signal quality S value of the optimal cell is always greater than or equal to the signal quality S reselection value.

205. When the signal strength S value and the signal quality S value of the optimal cell meet the reselection threshold, the step of starting cell reselection is specifically: if the signal strength of the optimal cell is within the time period of checking the timer operation The signal quality is always greater than or equal to the reselection threshold, and the cell reselection is initiated.

206. During the time when the check timer is running, the optimal cell signal strength S value and signal quality S value are not always greater than or equal to the reselection threshold, and cell reselection is not initiated;

There are three cases where the reselection threshold is not always met: The signal strength S value of the optimal cell is always greater than or equal to the signal strength S reselection value, but the signal quality S value of the optimal cell is not always greater than or equal to the signal quality S reselection value;

The signal strength of the optimal cell S value is not always greater than or equal to the signal strength S reselection value, but the signal quality S value of the optimal cell is always greater than or equal to the signal quality S reselection value;

The signal strength of the optimal cell S value is not always greater than or equal to the signal strength S reselection value, and the signal quality S value of the optimal cell is not always greater than or equal to the signal quality S reselection value.

For those that are not always greater than the understanding, including always less than, sometimes greater than sometimes less than.

In the embodiment of the present invention, a step of determining whether the signal strength and the signal quality of the optimal cell meets the reselection threshold is added, and an inspection time T is added, so that it is necessary to continuously determine the signal of the optimal cell within the inspection time T. Whether the strength and signal quality always meet the reselection threshold, cell reselection will only occur if it is always satisfied. Thus, with respect to the prior art, this embodiment improves the signal strength and signal quality threshold of reselection, and also adds the inspection time T, so that some signal strength is good but the signal quality is poor, or the signal quality is good but A cell with poor signal strength will not enter the candidate range of the reselected cell, effectively avoiding the occurrence of the ping-pong effect.

At the same time, the reduction of the number of times of ping-pong reselection in the cell also effectively reduces the power consumption of the terminal and prolongs the standby time. For ease of understanding, the method for avoiding cell ping-pong reselection described in the foregoing embodiments is described in detail in a specific application scenario, specifically:

Based on the existing communication protocol specification, the terminal can generally obtain the candidate cell and the optimal cell in such a manner that the terminal obtains the neighbor cell list from the system information block received on the broadcast channel of the serving cell, and obtains the obtained The neighbor cell list includes a current serving cell and four neighboring cells, which are a current serving cell, a cell N1, a cell N2, a cell N3, and a cell N4.

The terminal measures the signal strength and signal quality of the current serving cell and the neighboring cell, that is, the signal strength and signal quality of the current serving cell, cell N1, cell N2, cell N3, and cell N4.

The signal strength S value and the signal quality S value of each cell are calculated according to the measured signal strength and signal quality of the current serving cell and each neighboring cell, and the signal strength R value or the signal quality R value is calculated simultaneously. Assuming that the information obtained from the system information module is information of the signal strength, the signal strength R value is calculated. The calculation result corresponds to: The signal strength S of the current serving cell is SrO, and the signal quality is S. The value is SqO, the signal strength R value RrO; the signal strength S value of the cell N1 is Sri, the signal quality S value is Sql, the signal strength R value Rrl; the signal strength S value of the cell N2 is Sr2, and the signal quality S value is Sq2, Signal strength R value Rr2; cell N3 signal strength S value is Sr3, signal quality S value is Sq3, signal strength R value Rr3; cell N4 signal strength S value is Sr4, signal quality S value is Sq4, signal strength R value Rr4.

If the calculated signal strength of the current serving cell S value is SrO, the signal quality S value is

SqO, the signal strength S of the cell N1 is Sri, the signal quality S is Sql, the signal strength S of the cell N2 is Sr2, the signal quality S is Sq2, and the signal strength S of the cell N3 is Sr3, and the signal quality is S value. For Sq3, the signal strength S value of the cell N4 is Sr4, and the signal quality S value is Sq4, which satisfies the S criterion, that is, SrO, Sri, Sr2, Sr3 and Sr4 are respectively greater than the minimum value of the signal strength S, and, SqO, Sql , Sq2, Sq3 and Sq4 are respectively greater than the minimum value of the signal quality S. Thus, the current serving cell and cell N1, cell N2, cell N3 and cell N4 are all candidate cell. The current serving cell, cell N1, cell N2, cell N3 and cell N4 are sorted according to the signal strength R value, that is, RrO, Rrl, Rr2, Rr3 and Rr4 are sorted, and the largest of RrO, Rrl, Rr2, Rr3 and Rr4 is determined. The value of the cell with the highest signal strength R is the optimal cell, and the value of the application scenario Rr2 is the largest, that is, the cell N2 is the optimal cell.

The check timer is started, and the running time of the timer is checked as a preset check time T. The relationship between the Sr2 value and the reselected Sr value is continuously determined from the start of the check timer, and the Sq2 value and the reselected Sq value are simultaneously determined. relationship. If the Sr2 value is always greater than or equal to the reselected Sr value within the check time T, and the Sq2 value is always greater than or equal to the reselected Sq value, then the reselection is initiated, and the cell N2 is taken as the reselected target cell.

If the Sr2 value is not always greater than or equal to the reselected Sr value, or the Sq2 value is not always greater than or equal to the reselected Sq value, the reselection is not initiated and the terminal continues to camp on the current serving cell. For example, the signal strength Sr2 value is much larger than the signal strength reselection Sr value, but the signal quality Sq2 value is much smaller than the reselected Sq value, and no reselection occurs. In this way, the signal strength is good, but the cell with poor signal quality does not enter the candidate range of the reselected cell, thus effectively avoiding the occurrence of the ping-pong effect.

The application scenario is that the current serving cell and the other four neighboring cells satisfy the condition of the serving cell. If the calculated signal strength S value of the cell N3 is Sr34艮, which is much larger than the signal strength S minimum, but the cell N3 The signal quality S value Sq3 is smaller than the minimum signal quality S, and the cell N3 cannot enter the rank of the candidate serving cell. If the other three neighboring cells satisfy the S criterion and the current serving cell also satisfies the S criterion, then the signal strength R value Sorting, only in the current serving cell and cell N1, small Zone N2 is performed between cell N4. The following describes the device embodiment in the embodiment of the present invention. Referring to FIG. 3, the terminal in the embodiment of the present invention includes:

The selecting unit 301 is configured to select, from the current serving cell and the adjacent non-serving cells, a cell that can serve as a candidate serving cell according to the S criterion.

The determining unit 302 is configured to determine, according to the R criterion, an optimal cell among the candidate serving cells selected by the selecting unit 301.

The determining unit 303 is configured to determine, when the optimal cell determined by the determining unit 302 is not the current serving cell, whether the signal strength and the signal quality of the optimal cell are greater than or equal to a reselection threshold.

The reselecting unit 304 is configured to start cell reselection if the signal strength and signal quality of the optimal cell determined by the determining unit 303 are greater than or equal to the reselection threshold.

In the terminal in this embodiment, after the selecting unit 301 selects the candidate serving cell, the determining unit 302 determines the optimal cell. If the optimal cell is not the current serving cell, the determining unit 303 determines the signal strength of the optimal cell. And whether the signal quality is greater than or equal to the reselection threshold, and the reselection threshold is higher than the minimum service threshold of the serving cell. If the signal strength and signal quality of the optimal cell are greater than or equal to the reselection threshold, reselection unit 304 initiates cell reselection. If the signal strength and signal quality of the optimal cell are not greater than or equal to the reselection threshold, and stay in the current serving cell, the terminal that raises the reselection threshold makes some signal strengths are good but the signal quality is poor, or A cell with good signal quality but poor signal strength will not enter the candidate range of the reselected cell, effectively avoiding the occurrence of the ping-pong effect.

Referring to FIG. 4, the embodiment of the present invention may further include: an check timer 403, configured to start timing, and notify the determining unit to start determining whether the signal strength and signal quality of the optimal cell are greater than or equal to a reselection threshold, and When the timing is ended, the notification judgment unit stops determining whether the signal strength and the signal quality of the optimal cell are greater than or equal to the reselection threshold, and the running time of the check timer 403 is the preset inspection time 1\

Correspondingly, the determining unit 404 is further configured to: after the determining unit 402 determines the optimal cell, determine whether the signal strength and the signal quality of the optimal cell are always greater than or equal to the reselection threshold in the time when the check timer 403 is running;

The reselecting unit 405 is further configured to: during the running time of the check timer 403, the determining unit 404 determines When the signal strength and signal quality of the optimal cell are always greater than or equal to the reselection threshold, cell reselection is initiated.

The minimum service threshold of the serving cell includes: a signal strength S minimum value and a signal quality S minimum value; the S criterion includes: the signal strength S value of the cell is greater than or equal to the signal strength S minimum value of the serving cell, and the signal quality S value of the cell is greater than Equal to the minimum value of the signal quality S of the serving cell;

The reselection threshold includes signal strength S reselection value and signal quality S reselection value, signal strength S reselection value is larger than the serving cell signal strength S minimum value, and signal quality S reselection value is greater than the serving cell signal quality S minimum value.

The determining unit 402 is further configured to: according to the signal strength R value or the signal quality R value, the cells whose all signal strength S values are greater than or equal to the signal strength S minimum value of the serving cell and the signal quality S value is greater than or equal to the signal quality S minimum value of the serving cell. Sorting is performed, and the cell with the highest signal strength R value or the signal quality R value is selected as the optimal cell.

The reselecting unit 405 is further configured to: when the signal strength S value of the optimal cell is greater than or equal to the signal strength S reselection value, and when the signal quality S value of the optimal cell is greater than or equal to the signal quality S reselection value, start the cell Re-election.

The specific working process of the terminal provided by the embodiment of the present invention is: after the selecting unit 401 selects the candidate serving cell, the determining unit 402 determines the optimal cell, and if the optimal cell is not the current serving cell, the check timer 403 is started. And at the start timing, the notification judging unit 404 starts to judge whether the signal strength and the signal quality of the optimal cell are greater than or equal to the reselection threshold, and notifies the judging unit to stop determining whether the signal strength and the signal quality of the optimal cell are stopped at the end timing. If the threshold is greater than or equal to the reselection threshold, the running time of the check timer is a preset check time T. If the running time T of the check timer 403 is within the running time T of the check timer 403, the judgment unit 404 continues to determine the signal strength and signal quality of the optimal cell. The reselection unit 405 is always greater than or equal to the reselection threshold, and the reselection unit 405 initiates cell reselection. If the signal strength and signal quality of the optimal cell are not continuously greater than or equal to the reselection threshold, and continue to camp on the current serving cell, the device that increases the reselection threshold and simultaneously adds the check timer makes some signal strengths are good but the signal Poor quality, Or the cell with good signal quality but poor signal strength will not enter the candidate range of the reselected cell, effectively avoiding the occurrence of the ping-pong effect. A person skilled in the art may understand that all or part of the various steps of the foregoing embodiments may be completed by a program instructing related hardware. The program may be stored in a computer readable storage medium, and the storage medium may include: ROM, RAM, disk or CD, etc.

The foregoing description of the method for avoiding cell ping-pong reselection provided by the embodiment of the present invention and the description of the terminal are only used to help understand the method and core idea of the present invention. Meanwhile, for those skilled in the art, based on The present invention is not limited by the scope of the present invention.

Claims

Rights request

A method for avoiding ping-pong reselection in a cell, characterized in that it comprises:

The method for avoiding cell ping-pong reselection according to claim 1, wherein: determining whether the signal strength and signal quality of the optimal cell is greater than or equal to a reselection threshold includes:

Starting a check timer, the time when the check timer is running is a preset check time T; determining whether the signal strength and signal quality of the optimal cell are always greater than or equal to reselection in the running time of the check timer Threshold

In the case that the signal strength and the signal quality of the optimal cell are greater than or equal to the reselection threshold, the step of initiating cell reselection includes: if the optimal cell signal strength and time are within the running time of the check timer The signal quality is always greater than or equal to the reselection threshold, and the cell reselection is initiated.

The method for avoiding cell ping-pong reselection according to claim 1 or 2, wherein: the minimum service threshold of the serving cell includes: a signal strength S minimum value and a signal quality S minimum value;

The S criterion includes: the signal strength S value of the cell is greater than or equal to the signal strength S minimum value of the serving cell, and the signal quality S value of the cell is greater than or equal to the serving cell signal quality S minimum value;

The R criterion includes: a cell having a signal strength S value greater than or equal to a signal strength S minimum value of the serving cell and a signal quality S value greater than or equal to a signal quality S minimum value of the serving cell according to the signal strength Degree R value or signal quality R value is sorted;

The reselection threshold includes a signal strength S reselection value and a signal quality S reselection value, the signal strength S reselection value is greater than the serving cell signal strength S minimum value, and the signal quality S reselection value is greater than the The serving cell signal quality S minimum.

The method for avoiding cell ping-pong re-selection according to claim 3, wherein: determining the optimal cell in the candidate serving cell according to the R criterion comprises:

All cells whose signal strength S value is greater than or equal to the signal strength S minimum value of the serving cell and whose signal quality S value is greater than or equal to the signal quality S minimum value of the serving cell are sorted according to the signal strength R value or the signal quality R value, and the sorted signal is selected. The cell with the highest R value or the signal quality R value is the best cell.

The method for avoiding cell ping-pong reselection according to claim 3, wherein: the initiating cell reselection in the case that the signal strength and signal quality of the optimal cell are greater than or equal to the reselection threshold includes:

When the signal strength S value of the optimal cell is greater than or equal to the signal strength S reselection value, and the signal quality S value of the optimal cell is greater than or equal to the signal quality S reselection value, cell reselection is initiated.

6. A terminal, comprising:

a determining unit, configured to determine, when the optimal cell determined by the determining unit is not the current serving cell, whether the signal strength and the signal quality of the optimal cell are greater than or equal to a reselection threshold, where the reselection threshold is higher than the service Minimum service threshold of the community;

And a reselecting unit, configured to start cell reselection if the signal strength and the signal quality of the optimal cell determined by the determining unit are greater than or equal to a reselection threshold.

7. The terminal according to claim 6, further comprising: Checking a timer, configured to start timing, and notifying the determining unit to start determining whether the signal strength and signal quality of the optimal cell are greater than or equal to a reselection threshold when the timing is started, and notifying the determining unit to stop when ending the timing Determining whether the signal strength and the signal quality of the optimal cell are greater than or equal to the reselection threshold, and the running time of the check timer is a preset check time T;

The determining unit is further configured to: after the determining unit determines the optimal cell, determine whether the signal strength and signal quality of the optimal cell are always greater than a reselection threshold within a time period in which the check timer is running;

And the reselecting unit is further configured to: when the determining unit breaks out that the signal strength and the signal quality of the optimal cell are always greater than or equal to the reselection threshold, the cell reselection is started.

8. The terminal according to claim 6 or 7, characterized in that:

The minimum service threshold of the serving cell includes: a signal strength S minimum value and a signal quality S minimum value;

The R criterion includes: performing, according to a signal strength R value or a signal quality R value, a cell in which all signal strength S values are greater than or equal to a signal strength S minimum value of a serving cell and a signal quality S value is greater than or equal to a signal quality S minimum value of a serving cell. Sort

The terminal according to claim 8, wherein the determining unit is further configured to: use a signal that has a signal strength S value greater than or equal to a signal strength S minimum value of the serving cell and a signal quality S value greater than or equal to a serving cell. The cells with the minimum quality S are sorted according to the signal strength R value or the signal quality R value, and the cell with the highest signal strength R value or the signal quality R value is selected as the optimal cell.

The terminal according to claim 8, wherein: the reselecting unit is further configured to: when the signal strength S value of the optimal cell is greater than or equal to a signal strength S reselection value, and the most When the signal quality S value of the excellent cell is greater than or equal to the signal quality S reselection value, cell reselection is initiated.