CN110831099B

CN110831099B - Cell reselection method, device, terminal and network node

Info

Publication number: CN110831099B
Application number: CN201810899171.0A
Authority: CN
Inventors: 范江胜; 梁靖
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2018-08-08
Filing date: 2018-08-08
Publication date: 2022-06-28
Anticipated expiration: 2038-08-08
Also published as: CN110831099A

Abstract

The invention provides a cell reselection method, a cell reselection device, a terminal and a network node, wherein the cell reselection method comprises the following steps: after the ping-pong cell reselection is determined to occur, newly adding a constraint condition for limiting the neighbor cell with the ping-pong reselection problem before re-reselection enters the original serving cell and/or the candidate reselection neighbor cell in the next round of cell reselection evaluation process; and performing cell reselection according to the newly added constraint condition. According to the scheme, after the ping-pong cell reselection is determined to occur, in the next round of cell reselection evaluation process, constraint conditions for limiting the adjacent cell with the ping-pong reselection problem before re-reselection is performed are newly added to the original serving cell and/or the candidate reselection adjacent cell; performing cell reselection according to the newly added constraint condition; the adjacent cell with the ping-pong reselection problem before re-reselection entering can be avoided to a certain extent, the ping-pong reselection problem of the terminal in the cell reselection process is solved, and the network performance and the terminal experience are optimized.

Description

Cell reselection method, device, terminal and network node

Technical Field

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

Background

In the cell reselection process of an LTE system, a terminal judges whether a neighboring cell is suitable for reselection of the cell and judges the inconsistency of a current serving cell, wherein the inconsistency is that the terminal uses cell-level system parameters when judging the serving cell; in the actual deployment process, the parameter value of the cell level and the system parameter value of the frequency point level are likely to be different, that is, the terminal determines that the parameters adopted by the serving cell and the neighboring cell have different values, before reselection, the terminal finds that the neighboring cell meets the cell reselection condition by using the frequency point level reselection parameter of the serving cell when the serving cell determines the neighboring cell, but after reselecting the neighboring cell, the terminal finds that the neighboring cell is not suitable for residing when using the cell level parameter of the cell, and therefore returns to the cell before reselection, even the problem that the terminal reselects back and forth between two cells in a short time can occur, so that the terminal has cell reselection ping-pong.

Disclosure of Invention

The invention aims to provide a cell reselection method, a cell reselection device, a terminal and a network node, and solves the problem of ping-pong cell reselection of the terminal in the prior art.

In order to solve the foregoing technical problem, an embodiment of the present invention provides a cell reselection method, which is applied to a terminal, and includes:

after the ping-pong cell reselection is determined to occur, in the next round of cell reselection evaluation process, newly adding a constraint condition for limiting the occurrence of the ping-pong reselection problem neighbor cell before re-reselection entering into the original serving cell and/or the candidate reselection neighbor cell;

and performing cell reselection according to the newly added constraint condition.

Optionally, the step of adding a constraint condition for limiting the occurrence of ping-pong reselection problem to the candidate reselection neighboring cell before reselection entry includes:

when the candidate reselection neighboring cell is a pilot frequency or a different system neighboring cell, calculating a cell selection signal strength value Srxlev and a cell selection signal quality value Squal of the candidate reselection neighboring cell respectively by adopting the following formulas:

Srxlev＝Q_rxlevmeas–(Q_rxlevmin+Q_{rxlevminoffset})–P_compensation-Qoffset_temp-Qpingpang_temp1；

Squal＝Q_qualmeas–(Q_qualmin+Q_{qualminoffset})-Qoffset_temp-Qpingpang_temp1；

wherein Q_rxlevmeasIndicating a reference signal received power value of a measured cell;

Q_rxlevminrepresents a minimum reference signal received power value received by the cell;

Q_{rxlevminoffset}the terminal is indicated to Q when residing on a virtual public land mobile network VPLMN to periodically search for a high priority public land mobile network PLMN_rxlevminAn added offset value;

P_compensationpresentation and terminal uplinkLink power compensation related parameter values;

Qoffset_tempRepresents a temporary offset value;

Qpingpang_temp1representing a newly added constraint condition for a different frequency or different system neighbor cell reselection evaluation process;

Q_qualmeasindicating a measured cell reference signal reception quality value;

Q_qualmina minimum reference signal reception quality value indicating cell reception;

Q_{qualminoffset}indicating to Q when the terminal resides on VPLMN to periodically search for high priority PLMN_qualminAn added offset value.

Optionally, when the terminal performs ping-pong reselection on the cell, if the terminal stores the system information of the original serving cell and the different frequency or different system cell which has the ping-pong reselection problem before, then qpingpaging_temp1The values of the parameters are defined as:

Qpingpang_temp1≥(Q1-Q2)；

wherein Q is₁And Q₂At the same time is Q_rxlevminOr at the same time Q_qualmin；

Q1 refers to Q in the inter-frequency or inter-system neighbor cell system information block SIB1 where ping-pong reselection problems occurred before_rxlevminOr Q_qualminA parameter;

q2 refers to Q in SIB except SIB1 in original service cell_rxlevminOr Q_qualminA parameter;

if the cell in which the ping-pong reselection occurs is a pilot frequency cell, Q2 uses Q in SIB5 of a long term evolution LTE system or SIB4 of a new air interface NR system_rxlevminOr Q_qualminParameter, if the cell in which the ping-pong reselection occurs is a cell of a heterogeneous system, Q2 uses Q in SIB6 of LTE system or SIB5 of NR system_rxlevminOr Q_qualminAnd (4) parameters.

Optionally, Qpingpang_temp1The parameters are obtained by the terminal from the broadcasted system information;

when the candidate reselection neighboring cell is the pilot frequency neighboring cell, the Qpingpang_temp1The parameters are placed in a system information block SIB5 of a long term evolution LTE system or a SIB4 of a new air interface NR system;

when the candidate reselection neighboring cell is a neighbor cell of a different system, Qpingpang_temp1The parameters are placed in SIB6 for LTE systems or SIB5 for NR systems.

Optionally, the step of adding a constraint condition for limiting the neighboring cell with ping-pong reselection problem before re-reselection into the candidate reselection neighboring cell includes:

when the candidate reselection adjacent cell is the different-frequency adjacent cell with the same frequency or the same priority, calculating the different-frequency adjacent cell grade judgment standard R with the same frequency or the same priority_nThe following calculation formula is adopted:

R_n＝Q_meas,n-Qoffset-Qoffset_temp-Qpingpang_temp3；

wherein Q is_meas,nRepresenting the receiving power value of the actually measured reference signal of the adjacent cell;

Qoffset_temprepresents a temporary offset value;

qoffset represents a power offset value additionally introduced to a pilot frequency cell with the same frequency or priority in the cell reselection process;

Qpingpang_temp3and representing the newly added constraint condition for the reselection evaluation process of the different-frequency adjacent cells with the same frequency or the same priority.

Optionally, when the terminal performs ping-pong reselection on the cell, if the terminal stores the system information of the original serving cell and the neighboring cell with the same frequency or the same priority and the same priority that has the ping-pong reselection problem, then qpingpaging _temp3The values of the parameters are defined as:

Qpingpang_temp3≥(Q3-Q4)；

wherein Q3 and Q4 are both Q_rxlevminOr at the same time Q_qualmin；

Q3 refers to Q in the same frequency or same priority inter-frequency neighbor cell system information block SIB1 where ping-pong reselection problems occurred before_rxlevminOr Q_qualminA parameter;

q4 refers to SIB3 of LTE system or NR system over new air interfaceQ in SIB2_rxlevminOr Q_qualminAnd (4) parameters.

Optionally, Qpingpang_temp3The parameters are obtained by the terminal from the broadcasted system information;

when the candidate reselection adjacent cell is the pilot frequency adjacent cell with the same frequency or the same priority, Qpingpang_temp3The parameters are placed in a system information block SIB3 of a long term evolution, LTE, system or a SIB2 of a new air interface, NR, system.

Optionally, the step of adding a constraint condition for limiting a neighboring cell with a ping-pong reselection problem before re-reselection into the original serving cell includes:

when the candidate reselection neighboring cell is a pilot frequency or a different system neighboring cell, calculating a cell selection signal strength value Srxlev and a cell selection signal quality value Squal of an original serving cell respectively by adopting the following formulas:

Srxlev＝Q_rxlevmeas–(Q_rxlevmin+Q_{rxlevminoffset})–P_compensation-Qoffset_temp+Qpingpang_temp2；

Squal＝Q_qualmeas–(Q_qualmin+Q_{qualminoffset})-Qoffset_temp+Qpingpang_temp2；

wherein Q_rxlevmeasIndicating a measured cell reference signal received power value;

Q_{rxlevminoffset}the terminal is indicated to Q when residing on a virtual public land mobile network VPLMN to periodically search for a high priority public land mobile network PLMN _rxlevminAn added offset value;

P_compensationa parameter value representing a value associated with uplink power compensation of the terminal;

Qoffset_temprepresents a temporary offset value;

Qpingpang_temp2representing a newly added constraint condition for the reselection evaluation process of the original service cell;

Q_qualmeasindicating the measured cell reference signalAn acceptance value;

Q_{qualminoffset}indicating to Q when the terminal resides on VPLMN to periodically search for high priority PLMN_qualminThe added offset value.

Optionally, Qpingpang_temp2The parameters are obtained by the terminal from the broadcasted system information.

when the candidate reselection adjacent cell is the different-frequency adjacent cell with the same frequency or priority, calculating the grade judgment standard R of the original service cell_sThe following calculation formula is adopted:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp+Qpingpang_temp4；

wherein Q is_meas,sRepresenting the receiving power value of the actually measured reference signal of the original service cell;

Q_Hysta hysteresis factor expressed as an increase in serving cell;

Qoffset_temprepresents a temporary offset value;

Qpingpang_temp4and representing the newly added constraint condition for the original serving cell reselection evaluation process.

Optionally, Qpingpang_temp4The parameters are obtained by the terminal from the broadcasted system information.

Optionally, after it is determined that the ping-pong cell reselection occurs, in a next round of cell reselection evaluation process, newly adding a constraint condition for limiting a neighboring cell with a ping-pong reselection problem occurring before entering a reselection again to the original serving cell and/or the candidate reselection neighboring cell, includes:

If the terminal enters the same cell for N times within the preset time length T and N1 times in the N times, the terminal finds that the cell does not meet the cell suitability criterion, and immediately enters a cell selection state; and/or

The terminal finds that the cell meets the cell residence condition but is in a critical state for N2 times out of N times, and immediately reselects another cell once the cell reselection condition is met;

determining that the terminal has undergone ping-pong cell reselection; in the next round of cell reselection evaluation process, newly adding constraint conditions for limiting adjacent cells with ping-pong reselection problems before re-reselection entering into the original serving cell and/or the candidate reselection adjacent cells;

wherein N is N1+ N2, N1 is not less than 0, N2 is not less than 0, and N1 and N2 cannot be 0 at the same time.

Optionally, T and N are determined according to system parameters; or

T and N are determined from the system parameters and the scaling factor.

Optionally, the constraint condition is a permanent constraint condition or a temporary constraint condition.

The embodiment of the invention also provides a cell reselection method, which is applied to a network node and comprises the following steps:

and broadcasting the system information to the original serving cell and/or the candidate reselection neighbor cell, wherein the constraint conditions are newly added in the reselection evaluation process and used for limiting the neighbor cell with ping-pong reselection problem before re-reselection.

Optionally, the step of broadcasting, in the system information, to the candidate reselection neighboring cell, a constraint condition newly added in the reselection evaluation process for limiting the neighboring cell with ping-pong reselection problem before entering reselection again includes:

when the candidate reselection neighboring cell is the pilot frequency neighboring cell, placing the newly added constraint condition in a system information block SIB5 of a Long Term Evolution (LTE) system or a SIB4 of a new air interface (NR) system; or

And when the candidate reselection adjacent cell is the adjacent cell of the different system, placing the newly added constraint condition in the SIB6 of the LTE system or the SIB5 of the new air interface NR system.

and when the candidate reselection adjacent cell is the pilot frequency adjacent cell with the same frequency or the same priority, placing the newly added constraint condition in a system information block SIB3 of a Long Term Evolution (LTE) system or a SIB2 of a new air interface (NR) system.

The embodiment of the invention also provides a terminal, which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor; the processor implements the following steps when executing the program:

After the ping-pong cell reselection is determined to occur, newly adding a constraint condition for limiting the neighbor cell with the ping-pong reselection problem before re-reselection enters the original serving cell and/or the candidate reselection neighbor cell in the next round of cell reselection evaluation process;

Optionally, the processor is specifically configured to:

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

Q_{qualminoffset}Q is given when the terminal is represented to reside on the VPLMN to periodically search for high priority PLMN_qualminAn added offset value.

Optionally, when the terminal performs ping-pong reselection on the cell, if the terminal stores the system information of the original serving cell and the different frequency or different system cell which has the ping-pong reselection problem before, then Q is determined_{pingpangtemp1}The values of the parameters are defined as:

Q_{pingpangtemp1}≥(Q1-Q2)；

if the cell in which the ping-pong reselection occurs is a pilot frequency cell, the Q2 uses the Q in the SIB5 of the long term evolution LTE system or the SIB4 of the new air interface NR system_rxlevminOr Q_qualminParameter, if the cell in which the ping-pong reselection occurs is a cell of a heterogeneous system, Q2 uses Q in SIB6 of LTE system or SIB5 of NR system_rxlevminOr Q_qualminAnd (4) parameters.

when the candidate reselection neighboring cell is the pilot frequency neighboring cell, Qpingpang_temp1Parameter setting in system information block SIB5 or new air interface NR system of long term evolution LTE systemIn SIB4 of (a);

Optionally, the processor is specifically configured to:

R_n＝Q_meas,n-Qoffset-Qoffset_temp-Qpingpang_temp3；

Qoffset_temprepresents a temporary offset value;

Optionally, when the terminal performs ping-pong reselection on the cell, if the terminal stores the system information of the original serving cell and the neighboring cell with the same frequency or the same priority and the same priority that has the ping-pong reselection problem, then qpingpaging_temp3The values of the parameters are defined as:

Qpingpang_temp3≥(Q3-Q4)；

wherein Q3 and Q4 are both Q_rxlevminOr at the same time Q_qualmin；

q4 refers to Q in SIB3 of long term evolution LTE system or SIB2 of new air interface NR system _rxlevminOr Q_qualminAnd (4) parameters.

Optionally, the processor is specifically configured to:

wherein Q is_rxlevmeasIndicating a measured cell reference signal received power value;

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

Optionally, the processor is specifically configured to:

when the candidate reselection adjacent cell is the different-frequency adjacent cell with the same frequency or the same priority, calculating the grade judgment standard R of the original service cell_sThe following calculation formula is adopted:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp+Qpingpang_temp4；

Q_Hysta hysteresis factor expressed as an increase in serving cell;

Qoffset_temprepresents a temporary offset value;

Optionally, the processor is specifically configured to:

if the terminal enters the same cell for N times within the preset time length T and N1 times out of the N times, the terminal finds that the cell does not meet the cell suitability criterion, and immediately enters a cell selection state; and/or

Optionally, T and N are determined according to system parameters; or

T and N are determined from the system parameters and the scaling factor.

The embodiment of the invention also provides a network node, which comprises a memory, a processor, a transceiver and a computer program which is stored on the memory and can run on the processor; the processor implements the following steps when executing the program:

and broadcasting the system information to the original serving cell and/or the candidate reselection neighboring cell through the transceiver, wherein the constraint conditions are newly added in the reselection evaluation process and used for limiting the neighboring cell with ping-pong reselection problem before re-reselection.

Optionally, the operation of broadcasting, in the system information, to the candidate reselection neighboring cell, a constraint condition newly added in the reselection evaluation process for limiting the neighboring cell with ping-pong reselection problem before entering reselection again includes:

And when the candidate reselection neighboring cell is a neighboring cell of a different system, placing the newly added constraint condition in an SIB6 of an LTE system or an SIB5 of a new air interface NR system.

An 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 the steps of the above-mentioned cell reselection method.

The embodiment of the invention also provides a cell reselection device, which is applied to a terminal and comprises the following steps:

the first processing module is used for newly adding a constraint condition for limiting the adjacent cell with the ping-pong reselection problem before re-reselection entering into the original serving cell and/or the candidate reselection adjacent cell in the next round of cell reselection evaluation process after the ping-pong cell reselection is determined to occur;

And the first reselection module is used for reselecting the cell according to the newly added constraint condition.

Optionally, the first processing module is specifically configured to:

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

Optionally, when the terminal performs ping-pong reselection on the cell, if the terminal stores the system information of the original serving cell and the different frequency or different system cell which has the ping-pong reselection problem before, then qpingpaging _temp1The values of the parameters are defined as:

Qpingpang_temp1≥(Q1-Q2)；

when the candidate reselection neighboring cell is the pilot frequency neighboring cell, Qpingpang_temp1The parameters are placed in a system information block SIB5 of a long term evolution LTE system or a SIB4 of a new air interface NR system;

Optionally, the first processing module is specifically configured to:

when the candidate reselection adjacent cell is the different-frequency adjacent cell with the same frequency or the same priority, calculating the different-frequency adjacent cell grade judgment standard R with the same frequency or the same priority _nThe following calculation formula is adopted:

R_n＝Q_meas,n-Qoffset-Qoffset_temp-Qpingpang_temp3；

Qoffset_temprepresents a temporary offset value;

Qpingpang_temp3and representing the newly added constraint condition for the reselection evaluation process of the different-frequency adjacent cells with the same frequency or priority.

Qpingpang_temp3≥(Q3-Q4)；

wherein Q3 and Q4 are both Q_rxlevminOr at the same time Q_qualmin；

q4 refers to Q in SIB3 of long term evolution LTE system or SIB2 of new air interface NR system_rxlevminOr Q_qualminAnd (4) parameters.

Optionally, the first processing module is specifically configured to:

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

Optionally, the first processing module is specifically configured to:

the candidate reselection neighboring cells are of the same frequency or the same frequency When the priority is different frequency adjacent cell, calculating the grade judgment standard R of the original service cell_sThe following calculation formula is adopted:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp+Qpingpang_temp4；

wherein Q_meas,sRepresenting the receiving power value of the actually measured reference signal of the original service cell;

Q_Hysta hysteresis factor expressed as an increase in serving cell;

Qoffset_temprepresents a temporary offset value;

Optionally, the first processing module is specifically configured to:

Optionally, T and N are determined according to system parameters; or alternatively

T and N are determined according to system parameters and scaling factors.

The embodiment of the invention also provides a cell reselection device, which is applied to a network node and comprises the following steps:

and the second processing module is used for broadcasting the constraint conditions to the original serving cell and/or the candidate reselected neighbor cell in the system information, wherein the constraint conditions are newly added in the reselection evaluation process and are used for limiting the neighbor cell with the ping-pong reselection problem before reselecting to enter.

Optionally, the operation of broadcasting, in the system information, to the candidate reselection neighboring cell, a constraint condition newly added in the reselection evaluation process for limiting the occurrence of the ping-pong reselection problem neighboring cell before reselection entry includes:

when the candidate reselection adjacent cell is the pilot frequency adjacent cell, placing the newly added constraint condition in a system information block SIB5 of a long term evolution LTE system or an SIB4 of a new air interface NR system; or alternatively

The technical scheme of the invention has the following beneficial effects:

in the above scheme, after determining that ping-pong cell reselection occurs, in the next round of cell reselection evaluation process, the cell reselection method newly adds a constraint condition for limiting the neighbor cell with ping-pong reselection problem occurring before re-reselection enters the original serving cell and/or the candidate reselection neighbor cell; performing cell reselection according to the newly added constraint condition; the adjacent cell with the ping-pong reselection problem before re-reselection entering can be avoided to a certain extent, the ping-pong reselection problem of the terminal in the cell reselection process is solved, and the network performance and the terminal experience are optimized.

Drawings

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

fig. 2 is a schematic flow chart of a cell reselection method according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a network node structure according to an embodiment of the present invention;

fig. 5 is a first schematic structural diagram of a cell reselection device according to an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a cell reselection device according to a second embodiment of the present invention.

Detailed Description

To make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

Before proceeding with the description of the embodiments of the present invention, some concepts used in the following description are first explained:

specifically, regarding the LTE cell S criterion (cell suitability criterion):

the cell S criterion satisfies:

srxlev >0 and Squal > 0;

wherein:

Srxlev＝Q_rxlevmeas–(Q_rxlevmin+Q_{rxlevminoffset})–P_compensation-Qoffset_temp；

Squal＝Q_qualmeas–(Q_qualmin+Q_{qualminoffset})-Qoffset_temp；

wherein the serving cell used in the cell reselection evaluation procedure is cell level Q in SIB1 (system information block 1)_rxlevminOr Q_qualminValue, in the process of evaluating the adjacent cell, the Q of the frequency point level in SIB3 or SIB5 or SIB6 is used_rxlevminOr Q_qualminThe value is obtained.

The meaning of each parameter is as follows:

regarding LTE cell reselection measurement rules:

when evaluating Srxlev and Squal of a non-serving cell for cell reselection purposes, the UE should use parameters provided by the serving cell, and specific starting criteria are as follows:

a) for co-frequency measurements, if the serving cell satisfies Srxlev>S_IntraSearchP(serving cell reference signal received power related co-channel measurement threshold evaluated in serving cell) and Squal >S_IntraSearchQ(serving cell reference signal reception quality-related co-channel measurement threshold evaluated in the serving cell), at which point the terminal does not perform co-channel measurements; otherwise, the terminal will perform the same-frequency measurement.

b) For the measurement of the different frequency or different systems, if the priority of the frequency point of the different frequency or different systems is higher than that of the frequency point of the current E-UTRAN service cell, the terminal should perform the measurement of other frequency points or different systems in the system with higher priority;

c) for the measurement of different frequencies or different systems, for the scenes that the priority of other frequency points in the E-UTRAN system is less than or equal to the priority of the current frequency point or the priority of the frequency points of the different systems is lower than the priority of the current frequency point, the specific rule is as follows:

S_{nonintrasearch}(pilot measurement threshold associated with pilot or inter-system cell reference signal received power evaluated in the serving cell) is given by the serving cell, if S_ServingCell(pilot frequency received in serving cell or inter-system cell reference signal received power value)>S_{nonintrasearch}And Squal>S_{nonIntraSearchQ}(pilot measurement threshold associated with pilot or inter-system cell reference signal reception quality value evaluated in serving cell), UE will not perform the above measurement unless E-UTRAN inter-frequency point redirection information is configured; otherwise, the terminal will perform the above measurements.

Regarding inter-frequency or inter-system cell reselection criteria under the E-UTRAN system:

if threshServingLowQ (low priority inter-frequency or inter-system cell reselection threshold related to serving cell reference signal received quality evaluated in the serving cell) occurs in SIB3 and the terminal resides in the current serving cell for more than 1 second, the terminal needs to reselect to a high priority E-UTRAN cell or inter-system cell when the following conditions are met:

1) high priority EUTRAN (Evolved UMTS Terrestrial Radio Access Network) or UTRAN (Universal Mobile Telecommunications System Terrestrial Radio Access Network) FDD (frequency division multiplexing) heterogeneous system or frequency point meeting at time Treselection_RATSqual (cell reselection time threshold related to system type)>Thresh_X,HighQ(high priority inter-frequency or inter-system cell reselection threshold related to serving cell reference signal reception quality evaluated in serving cell) or

2) High priority UTRAN TDD (time division multiplex), GERAN (GSM EDGE Radio Access Network) or CDMA2000 different system or frequency point meeting Treselection at time_RATInner Srxlev>Thresh_X,HighP(high priority inter-frequency or inter-system cell reselection threshold related to serving cell reference signal received power evaluated in the serving cell).

If threshServingLowQ does not appear in SIB3, the terminal needs to reselect to a high priority E-UTRAN cell or a heterogeneous system cell when the following conditions are met:

1) high priority inter-system or frequency point on time Treselection_RATAlways meet Srxlev>Thresh_X，_HighPAnd

2) the terminal resides in the current serving cell for more than 1 second.

If threshServingLowQ appears in SIB3 and the terminal is camping for more than 1 second in the current serving cell, the terminal needs to reselect to a low priority E-UTRAN cell or a heterogeneous system cell when the following conditions are met:

1) at time Treselection_RATInner, service cell Squal<Thresh_Serving,LowQ(Low priority inter-frequency or inter-system cell reselection threshold related to serving cell reference signal reception quality evaluated in serving cell) and low priority EUTRANOr UTRAN FDD different system or frequency point satisfies Squal>Thresh_X,LowQ(low priority inter-frequency or inter-system cell reselection threshold related to neighbor cell reference signal reception quality evaluated in serving cell) or

2) At time Treselection_RATInner, service cell Squal<Thresh_Serving,LowQAnd the low priority UTRAN TDD, GERAN or CDMA2000 different system or frequency point satisfies Srxlev>Thresh_X,LowP(low priority inter-frequency or inter-system cell reselection threshold related to neighbor cell reference signal received power evaluated in the serving cell).

If threshServingLowQ does not appear in SIB3, the terminal needs to reselect to a low priority E-UTRAN cell or an inter-system cell when the following conditions are met:

1) at time Treselection_RATInner and outer serving cell Srxlev<Thresh_Serving,LowP(low priority inter-frequency or inter-system cell reselection threshold related to serving cell reference signal received power evaluated in serving cell) and low priority inter-system or frequency point satisfies Srxlev>Thresh_X,LowPAnd

2) the terminal resides in the current serving cell for more than 1 second.

Regarding the reselection criterion of the LTE co-frequency or co-priority inter-frequency cells:

the grade decision criterion R of the local cell_sAnd adjacent cell grade judgment standard R_nIs defined as follows:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp；

R_n＝Q_meas,n-Qoffset-Qoffset_temp；

wherein, the meaning of each parameter is as follows:

the UE should rank-order all cells that meet the S-criteria condition, but should exclude CSG (closed subscriber group) cells that the UE is not allowed to access.

Obtaining Q_meas,n(it means that the adjacent cell actually measures the reference signal receiving power value, and only the reference signal receiving power value is considered in the process of same frequency or same priority pilot frequency) and Q_meas,s(refer to the actual measurement reference signal received power value in the cell), then the average RSRP value is used to calculate the R value (R in the formula)_sAnd R_nValue) and Rank-sort the cells according to R (Rank) criteria.

If a cell is ranked highest, the UE should reselect to the cell.

In most cases, the UE should select a new cell, but the following conditions should be satisfied:

at time Treselection_RATIn the interior, the new cell ranks at the top;

the terminal resides in the current serving cell for more than 1 second.

From the above, if the existing LTE mechanism is followed, the terminal uses the cell level Q in SIB1 for the serving cell during cell reselection evaluation_rxlevminOr Q_qualminParameter values, in the process of evaluating the adjacent cells, the Q of the frequency point level in SIB3 or SIB5 or SIB6 is used_rxlevminOr Q_qualminParameter values, probably due to cell level Q in the reselected new serving cell SIB1_rxlevminOr Q_qualminThe parameter value is larger than the Q of the frequency point level in the original service cell SIB3 or SIB5 or SIB6_rxlevminOr Q_qualminThe newly selected serving cell cannot meet the cell S criterion due to the parameter values, thereby causing the problem that the terminal immediately reselects back to the original serving cell.

Based on the above, the present invention provides a cell reselection method for a terminal in the prior art, which is applied to the terminal, and as shown in fig. 1, the method includes:

step 11: after the ping-pong cell reselection is determined to occur, newly adding a constraint condition for limiting the neighbor cell with the ping-pong reselection problem before re-reselection enters the original serving cell and/or the candidate reselection neighbor cell in the next round of cell reselection evaluation process;

Step 12: and performing cell reselection according to the newly added constraint condition.

According to the cell reselection method provided by the embodiment of the invention, after the ping-pong cell reselection is determined to occur, in the next round of cell reselection evaluation process, constraint conditions for limiting the neighbor cell with the ping-pong reselection problem occurring before re-reselection entering are newly added to the original serving cell and/or the candidate reselection neighbor cell; performing cell reselection according to the newly added constraint condition; the adjacent cell with the ping-pong reselection problem before re-reselection entering can be avoided to a certain extent, the ping-pong reselection problem of the terminal in the cell reselection process is solved, and the network performance and the terminal experience are optimized.

In the embodiment of the present invention, for an operation of "adding a constraint condition for restricting a neighboring cell with a ping-pong reselection problem before re-reselection into a candidate reselection neighboring cell", the following two examples are provided:

as an example, the step of adding the constraint condition for limiting the neighbor cell with ping-pong reselection problem before re-reselection into the candidate reselection neighbor cell includes:

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

For Qpingpang_temp1The embodiment of the present invention provides the following two ways, but not limited to:

in the first mode, when the terminal performs ping-pong reselection on a cell, if the terminal stores system information of an original serving cell and an inter-frequency or inter-system cell which has a ping-pong reselection problem before, then qpingpaging_temp1The values of the parameters are defined as:

Qpingpang_temp1≥(Q1-Q2)；

Q1 refers to Q in inter-frequency or inter-system neighbor cell system information block SIB1 where ping-pong reselection problems previously occurred _rxlevminOr Q_qualminA parameter;

Second mode, Qpingpang_temp1The parameters are obtained by the terminal from the broadcasted system information;

In example two, the step of adding a constraint condition for limiting the neighbor cell with ping-pong reselection problem before re-reselection into the candidate reselection neighbor cell includes:

R_n＝Q_meas,n-Qoffset-Qoffset_temp-Qpingpang_temp3；

Qoffset_temprepresents a temporary offset value;

For Qpingpang_temp3The embodiment of the present invention provides the following two ways, but not limited to:

in the first mode, when the terminal performs ping-pong reselection on a cell, if the terminal stores the system information of the original serving cell and the same-frequency or same-priority different-frequency neighboring cell which has the ping-pong reselection problem before, then qpingpaging_temp3The values of the parameters are defined as:

Qpingpang_temp3≥(Q3-Q4)；

wherein Q3 and Q4 are both Q_rxlevminOr at the same time Q_qualmin；

Second mode, Qpingpang_temp3The parameters are obtained by the terminal from the broadcasted system information;

when the candidate reselection adjacent cell is the pilot frequency adjacent cell with the same frequency or the same priority, Qpingpang _temp3The parameters are placed in a system information block SIB3 of a long term evolution LTE system or a SIB2 of a new air interface NR system.

In the embodiment of the present invention, for an operation of "adding a constraint condition for restricting a neighboring cell with a ping-pong reselection problem before re-reselection into an original serving cell", the following two examples are provided:

in an example one, the step of adding a constraint condition for limiting a neighboring cell in ping-pong reselection problem before re-reselection into an original serving cell includes:

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

Q_qualminA minimum reference signal reception quality value indicating reception by a cell;

Wherein, Qpingpang_temp2The parameters are obtained by the terminal from the broadcasted system information.

In example two, the step of adding a constraint condition for limiting the ping-pong reselection problem to the neighboring cell before re-reselection into the original serving cell includes:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp+Qpingpang_temp4；

Q_Hysta hysteresis factor expressed as an increase in serving cell;

Qoffset_temprepresents a temporary offset value;

Wherein, Qpingpang_temp4Parameters are broadcasted by the terminal from the system informationAnd (6) obtaining.

In the embodiment of the present invention, as to how a terminal specifically determines that ping-pong cell reselection occurs, the following measures are provided:

after the ping-pong cell reselection is determined to occur, in the next round of cell reselection evaluation process, newly adding a constraint condition for limiting the neighbor cell with the ping-pong reselection problem before re-reselection into the original serving cell and/or the candidate reselection neighbor cell, wherein the constraint condition comprises the following steps:

If the terminal enters the same cell for N times within the preset time length T and N1 times in the N times, the terminal finds that the cell does not meet the cell suitability criterion, and immediately enters a cell selection state; and/or N2 of the N times, the terminal finds that the cell satisfies the cell residence condition, but the condition is in a critical state, and once the cell reselection condition is satisfied, the terminal immediately reselects another cell;

determining that the terminal has performed ping-pong cell reselection; in the next round of cell reselection evaluation process, newly adding constraint conditions for limiting adjacent cells with ping-pong reselection problems before re-reselection entering into the original serving cell and/or the candidate reselection adjacent cells; wherein N is N1+ N2, N1 is not less than 0, N2 is not less than 0, and N1 and N2 cannot be 0 at the same time.

Specifically, T and N are determined from system parameters (without considering the manner of speed effects); or T and N are determined from system parameters and scaling factors (in a manner that takes into account speed effects).

In this description, in the embodiment of the present invention, the constraint condition may be a permanent constraint condition or a temporary constraint condition, and is not limited herein.

An embodiment of the present invention further provides a cell reselection method, applied to a network node, as shown in fig. 2, including:

Step 21: and broadcasting the system information to the original serving cell and/or the candidate reselection neighbor cell, wherein the constraint conditions are newly added in the reselection evaluation process and used for limiting the neighbor cell with ping-pong reselection problem before re-reselection.

The cell reselection method provided by the embodiment of the invention broadcasts in the system information to the original serving cell and/or the candidate reselection neighboring cell, and adds a constraint condition for limiting the neighboring cell with ping-pong reselection problem before re-reselection enters the reselection evaluation process; the method can support the terminal to newly add constraint conditions for limiting the adjacent cells with the ping-pong reselection problem before re-reselection entering into the original serving cell and/or the candidate reselection adjacent cells in the next round of cell reselection evaluation after the ping-pong cell reselection is determined to occur; performing cell reselection according to the newly added constraint condition; therefore, the adjacent cell with the ping-pong reselection problem before re-reselection is performed is avoided to a certain extent, the ping-pong reselection problem of the terminal in the cell reselection process is solved, and the network performance and the terminal experience are optimized.

Specifically, the step of broadcasting the constraint condition, which is newly added in the reselection evaluation process and used for limiting the neighboring cell with ping-pong reselection problem before re-reselection entering, to the candidate reselection neighboring cell in the system information includes: when the candidate reselection neighboring cell is the pilot frequency neighboring cell, placing the newly added constraint condition in a system information block SIB5 of a Long Term Evolution (LTE) system or a SIB4 of a new air interface (NR) system; or when the candidate reselection neighboring cell is a neighboring cell of a different system, placing the newly added constraint condition in the SIB6 of the LTE system or the SIB5 of the new air interface NR system.

The step of broadcasting the constraint conditions to the candidate reselection neighbor cells in the system information, wherein the constraint conditions are newly added in the reselection evaluation process and used for limiting the neighbor cells with ping-pong reselection problems before re-reselection, comprises the following steps: and when the candidate reselection adjacent cell is the pilot frequency adjacent cell with the same frequency or the same priority, placing the newly added constraint condition in a system information block SIB3 of a Long Term Evolution (LTE) system or a SIB2 of a new air interface (NR) system.

The cell reselection method provided by the embodiment of the present invention is further described below with reference to both sides of the terminal and the network node, where the constraint condition is a temporary constraint condition as an example.

The embodiment of the invention provides a cell reselection method aiming at the problem of cell ping-pong reselection of a terminal, which is mainly characterized in that when the terminal senses the problem of cell ping-pong reselection, a new constraint condition is temporarily added to an original serving cell and/or a candidate reselection neighboring cell in a new round of cell reselection evaluation process, thereby solving the problem of cell ping-pong reselection of the terminal in the cell reselection process.

The embodiments of the present invention provide the following three specific implementations, but are not limited thereto.

The first specific implementation way is as follows: temporarily increased conditions only restrict candidate reselection neighbor cells

1) For inter-frequency or inter-system neighbor cells

The calculation formula of Srxlev and Square of the original serving cell is the same as that of LTE, but a new constraint condition is temporarily added when the different-frequency or different-system neighbor cells Srxlev and Square are calculated, and the specific calculation formula is as follows:

Srxlev＝Q_rxlevmeas-(Q_rxlevmin+Q_{rxlevminoffset})-P_compensation-Qoffset_temp-Qpingpang_temp1；

Squal＝Q_qualmeas-(Q_qualmin+Q_{qualminoffset})-Qoffset_temp-Qpingpang_temp1；

wherein, Qpingpang_temp1The parameter is a constraint condition temporarily added to the reselection evaluation process of the neighboring cell of the different frequency or different system, the rest parameters are consistent with the meaning of LTE, and the parameter dereferencing principle can have two ideas:

1, thinking: the terminal itself has the function of memorizing and storing the cell system information, that is, when the terminal performs cell ping-pong reselection, the terminal side simultaneously stores the system information of the original service cell and the different frequency or different system cell which has previously occurred with the ping-pong reselection problem, so Qpingpang_temp1The values of the parameters can be defined as:

Qpingpang_temp1≥(Q1-Q2)；

wherein Q1 and Q2 may be Q at the same time_rxlevminOr simultaneously Q_qualmin(ii) a Q1 refers to Q in the inter-frequency or inter-system neighbor cell SIB1 where ping-pong reselection problems previously occurred_rxlevminOr Q_qualminA parameter; q2 refers to Q in SIB except SIB1 in original service cell_rxlevminOr Q_qualminParameter, if the cell where the ping-pong reselection problem occurred was an inter-frequency cell, then Q2 causesQ in SIB5(LTE system) or SIB4(NR system) is used _rxlevminOr Q_qualminParameter, if the cell where ping-pong reselection problem occurred before is a heterogeneous system cell, Q2 uses Q in SIB6(LTE system) or SIB5(NR system)_rxlevminOr Q_qualminAnd (4) parameters.

And (2) thinking: qpingpang_temp1Parameters are directly broadcast in the system information, and for the pilot neighbor cells, the parameters are put in SIB5(LTE system) or SIB4(NR system); for the inter-system neighbor cells, the parameters are put in SIB6(LTE system) or SIB5(NR system).

2) For different-frequency adjacent cells with same frequency or same priority

Original serving cell R_sThe calculation formula is the same as that of LTE, but the same frequency or same priority level of the adjacent cell R is calculated_nTemporarily adding a new constraint condition, wherein a specific calculation formula is as follows:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp；

R_n＝Q_meas,n-Qoffset-Qoffset_temp-Qpingpang_temp3；

wherein, Qpingpang_temp3The parameter is a constraint condition temporarily added to the reselection evaluation process of the different-frequency adjacent cells with the same frequency or the same priority, the rest parameters are consistent with the LTE meaning, and the parameter dereferencing principle can have two ideas:

1, thinking: the terminal has the function of memorizing and storing the system information of the cell, that is, when the terminal performs ping-pong reselection, the terminal side simultaneously stores the system information of the original service cell and the same-frequency or same-priority different-frequency neighboring cell which has the ping-pong reselection problem before, so Qpingpang _temp3The values of the parameters can be defined as:

Qpingpang_temp3>＝(Q3-Q4)；

wherein Q3 and Q4 may be Q at the same time_rxlevminOr simultaneously Q_qualmin(ii) a Q3 refers to Q in the same frequency or same priority different frequency adjacent cell SIB1 which has previously occurred ping-pong reselection problem_rxlevminOr Q_qualminA parameter;q4 refers to Q in the original serving cell SIB3(LTE system) or SIB2(NR system)_rxlevminOr Q_qualminAnd (4) parameters.

And (2) thinking: qpingpang_temp3Parameters are directly broadcast in the system information and are put in SIB3(LTE system) or SIB2(NR system) for same-frequency or same-priority different-frequency neighbor cells.

The second specific implementation manner is as follows: the temporarily increased condition only restricts the original serving cell

1) For inter-frequency or inter-system neighbor cells

The calculation formula used for evaluating the different-frequency or different-system neighbor cells Srxlev and Square is the same as that of LTE, but a new constraint condition is temporarily added when the original serving cells Srxlev and Square are evaluated, and the other parameters are consistent with the meaning of LTE, and the specific calculation formula is as follows:

Srxlev＝Q_rxlevmeas-(Q_rxlevmin+Q_{rxlevminoffset})-P_compensation-Qoffset_temp+Qpingpang_temp2；

Squal＝Q_qualmeas-(Q_qualmin+Q_{qualminoffset})-Qoffset_temp+Qpingpang_temp2；

wherein, Qpingpang_temp2The parameters are constraint conditions temporarily added to the original serving cell reselection evaluation process, the meanings of the rest parameters are consistent with those of LTE, and the parameters are directly broadcast in system information.

2) For different-frequency adjacent cells with same frequency or same priority

Same-frequency or same-priority different-frequency adjacent cell R _nThe calculation formula is the same as that of LTE, but the original serving cell R is calculated_sTemporarily adding a new constraint condition, wherein a specific calculation formula is as follows:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp+Qpingpang_temp4；

R_n＝Q_meas,n-Qoffset-Qoffset_temp；

wherein, Qpingpang_temp4The parameter is a constraint strip temporarily added to the original serving cell reselection evaluation processAnd (4) the rest parameters are consistent with the LTE meaning, and the parameters are directly broadcast and given in the system information.

The third concrete implementation mode is as follows: the temporarily added condition simultaneously constrains the original serving cell and the cell where ping-pong reselection occurs (which can also be understood as the fusion of the first specific implementation and the second specific implementation)

1) For inter-frequency or inter-system neighbor cells

Temporarily adding new constraint conditions when evaluating the original serving cells Srxlev and Square, wherein a specific calculation formula is as follows:

temporarily adding a new constraint condition when calculating the different frequency or different system neighbor cells Srxlev and Squal, wherein a specific calculation formula is as follows:

wherein Qpingpang_temp2The parameters are directly broadcast in the system information; qpingpang_temp1Given by any of the two concepts in the first specific implementation, the remaining parameters are consistent with the LTE meaning.

2) For different-frequency adjacent cells with same frequency or same priority

When evaluating the original serving cell Rs, a new constraint condition is temporarily added, and a specific calculation formula is as follows:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp+Qpingpang_temp4；

At the same frequency of evaluation orSame priority different frequency adjacent district R_nTemporarily adding new constraint conditions, wherein a specific calculation formula is as follows:

R_n＝Q_meas,n-Qoffset-Qoffset_temp-Qpingpang_temp3；

Qpingpang_temp4the parameters are directly broadcast in the system information, wherein Qpingpang_temp3Given by any of the two concepts in the first specific implementation, the remaining parameters are consistent with the LTE meaning.

From the perspective of the terminal, by any one of the three specific implementation manners, the reselection of the terminal to the cell which has undergone ping-pong reselection can be significantly reduced;

several possible ways for the terminal to determine that cell ping-pong reselection has occurred in a cell are as follows, but not limited thereto:

1) ways of disregarding the effect of speed

Mode 1:

the terminal enters the same cell for N times within a certain time T, and after the N times of entering the cell, the terminal finds that the current cell does not meet the basic S criterion (cell suitability criterion) required by cell residence, so that the terminal immediately enters a cell selection state and can judge that the cell ping-pong reselection problem occurs under the current condition, wherein the T value and the N value are given by system parameters;

mode 2:

the terminal enters the same cell for N times within a certain time T, although the terminal finds that the current cell meets the cell residence condition every time the terminal enters the cell, the condition is in a critical state, once the cell reselection condition is met (for example, after 1 s), the terminal can immediately reselect other cells to judge that the cell ping-pong reselection problem occurs under the current condition, wherein the T value and the N value are given by system parameters;

Mode 3:

the terminal enters the same cell for N times within a certain time T, the terminal finds that the current cell does not meet the basic S criterion required by cell residence in N times, so that the terminal immediately enters a cell selection state, the terminal finds that the current cell meets the cell residence conditions in the rest times, but the conditions are in a critical state, once the cell reselection conditions are met (for example, after 1S), the terminal immediately reselects other cells, the terminal can judge that the cell ping-pong reselection problem occurs in the current situation, and the T and N values are given by system parameters.

2) Ways of taking into account the influence of speed

Meanwhile, considering the influence of the terminal speed, for example, at a conventional speed, the terminal judges whether the cell ping-pong reselection problem occurs to use the parameter values T and N, and after the speed is divided into a plurality of grades, the T and N values of each corresponding grade can be scaled along with the speed.

Mode 4:

under the condition of considering the influence of speed, the terminal enters the same cell for N1 times within a certain time T1, and after N1 times enter the cell, the terminal finds that the current cell does not meet the basic S criterion required by cell residence, so that the terminal immediately enters a cell selection state, and can judge that under the current condition, the terminal confirms that the cell ping-pong reselection problem occurs, wherein T1 and N1 values are given by system parameters T and N and a scaling factor;

Mode 5:

considering the speed influence, the terminal enters the same cell N2 times within a certain time T2, although the terminal finds that the current cell meets the cell residence condition each time the terminal enters the cell, the condition is in a critical state, once the cell reselection condition is met (for example, after 1 s), the terminal will reselect another cell immediately, it can determine that, in the current situation, the terminal confirms that the cell ping-pong reselection problem occurs, where the T2 and N2 values are given by the system parameters T and N and the scaling factor;

mode 6:

considering the speed influence, the terminal enters the same cell N3 times and a part of N3 times within a certain time T3, so that the terminal finds that the current cell does not satisfy the basic S criterion required for cell camping, thereby causing the terminal to immediately enter a cell selection state, and the terminal finds that the current cell satisfies the cell camping condition (S criterion) for the remaining times, but the condition is in a critical state, and once the cell reselection condition is satisfied (for example, after 1S), the terminal immediately reselects another cell, which can be determined, and in the present case, the terminal confirms that the cell ping-pong reselection problem occurs, where the T3 and N3 values are given by the system parameters T and N and the scaling factor.

It can be known from the above that, the solution provided by the embodiment of the present invention is mainly that when a ping-pong reselection problem occurs, a terminal may temporarily add a new constraint condition when evaluating an S criterion of an original serving cell and/or a candidate reselected neighbor cell; therefore, the problem of cell ping-pong reselection existing in LTE all the time is solved, and the network performance and the terminal experience are optimized.

The embodiment of the invention also provides a terminal, which comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor; the processor implements the following steps when executing the program:

The terminal provided by the embodiment of the invention adds the constraint condition for limiting the adjacent cell with the ping-pong reselection problem before re-reselection entering into the original serving cell and/or the candidate reselection adjacent cell in the next round of cell reselection evaluation process after the ping-pong cell reselection is determined to occur; performing cell reselection according to the newly added constraint condition; the adjacent cell with the ping-pong reselection problem before re-reselection entering can be avoided to a certain extent, the ping-pong reselection problem of the terminal in the cell reselection process is solved, and the network performance and the terminal experience are optimized.

As shown in fig. 3, the terminal provided in the embodiment of the present invention includes:

a processor 31; and a memory 33 connected to the processor 31 through a bus interface 32, wherein the memory 33 is used for storing programs and data used by the processor 31 in executing operations, and when the processor 31 calls and executes the programs and data stored in the memory 33, the following processes are executed:

The terminal provided by the embodiment of the present invention may further include a transceiver 34, which is not limited herein.

Wherein a transceiver 34 is connected to the bus interface 32 for receiving and transmitting data under control of the processor 31.

It should be noted that in fig. 3, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 31 and various circuits of memory represented by memory 33 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 34 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. For different terminals, the user interface 35 may also be an interface capable of interfacing with a desired device, including but not limited to a keypad, display, speaker, microphone, joystick, etc. The processor 31 is responsible for managing the bus architecture and general processing, and the memory 33 may store data used by the processor 31 in performing operations.

Those skilled in the art will appreciate that all or part of the steps for implementing the above embodiments may be performed by hardware, or may be instructed to be performed by associated hardware by a computer program that includes instructions for performing some or all of the steps of the above methods; and the computer program may be stored in a readable storage medium, which may be any form of storage medium.

example one, the processor is specifically configured to:

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

Q_qualminto representA minimum reference signal reception quality value received by the cell;

Q_{qualminoffset}q is given when the terminal is represented to reside on the VPLMN to periodically search for high priority PLMN_qualminThe added offset value.

Qpingpang_temp1≥(Q1-Q2)；

wherein Q₁And Q₂At the same time is Q_rxlevminOr both Q_qualmin；

if the cell in which the ping-pong reselection occurs is a pilot frequency cell, the Q2 uses the Q in the SIB5 of the long term evolution LTE system or the SIB4 of the new air interface NR system _rxlevminOr Q_qualminParameter, if the cell in which the ping-pong reselection occurs is a cell of a heterogeneous system, Q2 uses Q in SIB6 of LTE system or SIB5 of NR system_rxlevminOr Q_qualminAnd (4) parameters.

when the candidate reselection neighboring cell is a neighbor cell of a different system, Qpingpang_temp1SIB6 or NR system with parameter placed in LTE systemIn the conventional SIB 5.

Example two, the processor is specifically to:

R_n＝Q_meas,n-Qoffset-Qoffset_temp-Qpingpang_temp3；

Qoffset_temprepresents a temporary offset value;

For Q_{pingpangtemp3}The embodiment of the present invention provides the following two ways, but not limited to:

In the first mode, when the terminal performs cell ping-pong reselection, if the terminal stores the system information of the original serving cell and the different-frequency neighboring cells with the same frequency or the same priority and having the previous ping-pong reselection problem, then qpingpaging_temp3The values of the parameters are defined as:

Qpingpang_temp3≥(Q3-Q4)；

wherein Q3 and Q4 are both Q_rxlevminOr at the same time Q_qualmin；

example one, the processor is specifically configured to:

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

Q_qualminindicating a cellA received minimum reference signal reception quality value;

Example two, the processor is specifically to:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp+Qpingpang_temp4；

Q_Hysta hysteresis factor expressed as an increase in serving cell;

Qoffset_temprepresents a temporary offset value;

Wherein, Qpingpang_temp4The parameters are obtained by the terminal from the broadcasted system information.

In the embodiment of the present invention, the following measures are provided for how a terminal specifically determines that ping-pong cell reselection occurs:

the processor is specifically configured to: if the terminal enters the same cell for N times within the preset time length T and N1 times out of the N times, the terminal finds that the cell does not meet the cell suitability criterion, and immediately enters a cell selection state; and/or N2 of the N times, the terminal finds that the cell satisfies the cell residence condition, but the condition is in a critical state, and once the cell reselection condition is satisfied, the terminal immediately reselects another cell;

Specifically, T and N are determined according to system parameters; or T and N are determined from system parameters and scaling factors.

In this description, in the embodiment of the present invention, the constraint condition may be a permanent constraint condition or a temporary constraint condition.

The implementation embodiments of the cell reselection method on the terminal side are all applicable to the embodiment of the terminal, and the same technical effects can also be achieved.

and broadcasting the system information to the original serving cell and/or candidate reselection neighboring cells through the transceiver, wherein the restriction conditions are newly added in the reselection evaluation process and used for limiting the neighboring cells with ping-pong reselection problems before re-reselection enters.

The network node provided by the embodiment of the invention broadcasts in the system information to the original serving cell and/or the candidate reselection neighboring cell, and adds a constraint condition for limiting the neighboring cell with ping-pong reselection problem before re-reselection enters the neighboring cell in the reselection evaluation process; the method can support the terminal to newly add constraint conditions for limiting the adjacent cells with the ping-pong reselection problem before re-reselection entering into the original serving cell and/or the candidate reselection adjacent cells in the next round of cell reselection evaluation after the ping-pong cell reselection is determined to occur; performing cell reselection according to the newly added constraint condition; therefore, the adjacent cell with the ping-pong reselection problem before re-reselection is performed is avoided to a certain extent, the ping-pong reselection problem of the terminal in the cell reselection process is solved, and the network performance and the terminal experience are optimized.

Specifically, as shown in fig. 4, the base station of the embodiment of the present invention includes:

a processor 41; and a memory 43 connected to the processor 41 through the bus interface 42, wherein the memory 43 is used for storing programs and data used by the processor 41 in executing operations, and when the processor 41 calls and executes the programs and data stored in the memory 43, the following processes are executed:

the system information is broadcasted to the original serving cell and/or candidate reselecting neighbor cell through the transceiver 44, and constraints for limiting the neighbor cell with ping-pong reselection problem before re-reselection is performed in the reselection evaluation process are newly added.

Wherein a transceiver 44 is connected to the bus interface 42 for receiving and transmitting data under control of the processor 41.

It should be noted that in fig. 4, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 41 and various circuits of memory represented by memory 43 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 44 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 41 is responsible for managing the bus architecture and general processing, and the memory 43 may store data used by the processor 41 in performing operations.

Specifically, the operation of broadcasting the constraint condition for limiting the neighboring cell with ping-pong reselection problem before re-reselection into the candidate reselection neighboring cell, which is newly added in the reselection evaluation process, in the system information includes: when the candidate reselection neighboring cell is the pilot frequency neighboring cell, placing the newly added constraint condition in a system information block SIB5 of a Long Term Evolution (LTE) system or a SIB4 of a new air interface (NR) system; or when the candidate reselection neighboring cell is a neighboring cell of a different system, placing the newly added constraint condition in the SIB6 of the LTE system or the SIB5 of the new air interface NR system.

The operation of broadcasting the constraint conditions to the candidate reselection neighbor cells in the system information, which are newly added in the reselection evaluation process and used for limiting the neighbor cells with ping-pong reselection problems before re-reselection is performed, comprises the following steps: and when the candidate reselection adjacent cell is the pilot frequency adjacent cell with the same frequency or the same priority, placing the newly added constraint condition in a system information block SIB3 of a Long Term Evolution (LTE) system or a SIB2 of a new air interface (NR) system.

The implementation embodiments of the cell reselection method on the network node side are all applicable to the embodiment of the network node, and the same technical effect can be achieved.

The implementation embodiments of the cell reselection method on the terminal side or the network node side are all applicable to the embodiment of the computer-readable storage medium, and the same technical effects can be achieved.

An embodiment of the present invention further provides a cell reselection apparatus, which is applied to a terminal, and as shown in fig. 5, the apparatus includes:

a first processing module 51, configured to add, after it is determined that ping-pong cell reselection occurs, a constraint condition for limiting a neighboring cell with a ping-pong reselection problem before entering reselection again to an original serving cell and/or a candidate reselection neighboring cell in a next round of cell reselection evaluation;

and a first reselection module 52, configured to perform cell reselection according to the newly added constraint condition.

The cell reselection device provided by the embodiment of the invention adds the constraint condition for limiting the adjacent cell with the ping-pong reselection problem before entering the re-reselection to the original serving cell and/or the candidate reselection adjacent cell in the next round of cell reselection evaluation process after the ping-pong cell reselection is determined to occur; performing cell reselection according to the newly added constraint condition; the adjacent cell with the ping-pong reselection problem before re-reselection entering can be avoided to a certain extent, the ping-pong reselection problem of the terminal in the cell reselection process is solved, and the network performance and the terminal experience are optimized.

in an example, the first processing module is specifically configured to:

Qoffset_temprepresents a temporary offset value;

Qpingpang_temp1indicating to inter-frequency or inter-system neighbor cell reselection evaluationEstimating newly added constraint conditions in the process;

Q_qualmeasindicating a measured cell reference signal reception quality value;

Q_{qualminoffset}indicating to Q when the terminal resides on VPLMN to periodically search for high priority PLMN _qualminThe added offset value.

Qpingpang_temp1≥(Q1-Q2)；

Second mode, Qping_pangtemp1The parameters are obtained by the terminal from the broadcasted system information;

when the candidate reselection neighboring cell is the pilot frequency neighboring cell, Qpingpang_temp1System information with parameters placed in Long Term Evolution (LTE) system An information block SIB5 or SIB4 of a new air interface NR system;

when the candidate reselection neighboring cell is a neighboring cell of a different system, Qpingpang_temp1The parameters are placed in SIB6 for LTE system or SIB5 for NR system.

In example two, the first processing module is specifically configured to:

R_n＝Q_meas,n-Qoffset-Qoffset_temp-Qpingpang_temp3；

Qoffset_temprepresents a temporary offset value;

Qpingpang_temp3≥(Q3-Q4)；

wherein Q3 and Q4 are both Q _rxlevminOr at the same time Q_qualmin；

in an example, the first processing module is specifically configured to:

when the candidate reselection adjacent cell is a pilot frequency or a different system adjacent cell, calculating a cell selection signal strength value Srxlev and a cell selection signal quality value Squal of an original service cell respectively by adopting the following formulas:

Qoffset_temprepresents a temporary offset value;

Qpingpang_temp2showing to original service smallNewly added constraint conditions in the process of area reselection evaluation;

Q_qualmeasindicating a measured cell reference signal reception quality value;

In example two, the first processing module is specifically configured to:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp+Qpingpang_temp4；

Q_Hysta hysteresis factor expressed as an increase in serving cell;

Qoffset_temprepresents a temporary offset value;

the first processing module is specifically configured to: if the terminal enters the same cell for N times within the preset time length T and N1 times out of the N times, the terminal finds that the cell does not meet the cell suitability criterion, and immediately enters a cell selection state; and/or N2 of the N times, the terminal finds that the cell satisfies the cell residence condition, but the condition is in a critical state, and once the cell reselection condition is satisfied, the terminal immediately reselects another cell;

Determining that the terminal has performed ping-pong cell reselection; in the next round of cell reselection evaluation process, newly adding constraint conditions for limiting adjacent cells with ping-pong reselection problems before re-reselection entering into the original serving cell and/or the candidate reselection adjacent cells;

The implementation embodiments of the cell reselection method at the terminal side are all applicable to the embodiment of the cell reselection device, and the same technical effects can be achieved.

An embodiment of the present invention further provides a cell reselection apparatus, which is applied to a network node, and as shown in fig. 6, the apparatus includes:

and the second processing module 61 is configured to broadcast, in the system information, a constraint condition for limiting the neighboring cell with ping-pong reselection problem before entering reselection again, where the constraint condition is newly added in the reselection evaluation process, to the original serving cell and/or the candidate reselection neighboring cell.

The cell reselection device provided by the embodiment of the invention broadcasts in system information to the original serving cell and/or the candidate reselection neighboring cell, and adds a constraint condition for limiting the neighboring cell with ping-pong reselection problem before re-reselection entering the neighboring cell in the reselection evaluation process; the method can support the terminal to newly add constraint conditions for limiting the adjacent cells with the ping-pong reselection problem before re-reselection entering into the original serving cell and/or the candidate reselection adjacent cells in the next round of cell reselection evaluation after the ping-pong cell reselection is determined to occur; performing cell reselection according to the newly added constraint condition; therefore, the adjacent cell with the ping-pong reselection problem before re-reselection is performed is avoided to a certain extent, the ping-pong reselection problem of the terminal in the cell reselection process is solved, and the network performance and the terminal experience are optimized.

Specifically, the operation of broadcasting the constraint condition, which is newly added in the reselection evaluation process and used for limiting the occurrence of the ping-pong reselection problem neighboring cell before re-reselection entering, to the candidate reselection neighboring cell in the system information includes: when the candidate reselection adjacent cell is the pilot frequency adjacent cell, placing the newly added constraint condition in a system information block SIB5 of a long term evolution LTE system or an SIB4 of a new air interface NR system; or when the candidate reselection neighboring cell is a neighboring cell of a different system, placing the newly added constraint condition in an SIB6 of an LTE system or an SIB5 of a new air interface NR system.

The operation of broadcasting the constraint conditions for restricting the ping-pong reselection problem neighbor cell before re-reselection entering, which are newly added in the reselection evaluation process and are used for the candidate reselection neighbor cell, in the system information comprises the following operations: and when the candidate reselection adjacent cell is the pilot frequency adjacent cell with the same frequency or priority, placing the newly added constraint condition in a system information block SIB3 of a Long Term Evolution (LTE) system or an SIB2 of a new air interface (NR) system.

The implementation embodiments of the cell reselection method on the network node side are all applicable to the embodiment of the cell reselection device, and the same technical effects can be achieved.

It should be noted that many of the functional units described in this specification have been referred to as modules, in order to more particularly emphasize their implementation independence.

In embodiments of the present invention, modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be constructed as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within the modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices, and may exist, at least partially, merely as electronic signals on a system or network.

When a module can be implemented by software, considering the level of hardware technology, a module implemented in software may build a corresponding hardware circuit to implement corresponding functions, without considering the cost, and the hardware circuit may include a conventional Very Large Scale Integration (VLSI) circuit or a gate array and an existing semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.

While the foregoing is directed to the preferred embodiment of the present invention, it will be appreciated by those skilled in the art that various changes and modifications may be made therein without departing from the principles of the invention as set forth in the appended claims.

Claims

1. A cell reselection method is applied to a terminal, and is characterized by comprising the following steps:

Performing cell reselection according to the newly added constraint condition;

the method comprises the following steps of adding a constraint condition for limiting a neighboring cell with a ping-pong reselection problem before re-reselection into an original serving cell, wherein the constraint condition comprises the following steps:

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

2. The cell reselection method of claim 1, wherein Qpingpang _temp2The parameters are obtained by the terminal from the broadcasted system information.

3. The cell reselection method of claim 1, wherein the step of adding a new constraint condition for limiting the neighbor cells with ping-pong reselection problem before re-reselection into the original serving cell comprises:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp+Qpingpang_temp4；

Q_Hysta hysteresis factor expressed as an increase in serving cell;

Qoffset_temprepresents a temporary offset value;

4. The cell reselection method of claim 3, wherein Qpingpang_temp4The parameters are obtained by the terminal from the broadcasted system information.

5. The cell reselection method of claim 1, wherein the step of adding new constraints for limiting ping-pong reselection problem neighbor cells occurring before re-reselection into the original serving cell and/or candidate reselection neighbor cells in a next round of cell reselection evaluation after it is determined that ping-pong cell reselection has occurred comprises:

The terminal finds that the cell meets the cell residence condition in N2 times of the N times, but the condition is in a critical state, and once the cell reselection condition is met, the terminal immediately reselects another cell;

6. The cell reselection method of claim 5, wherein T and N are determined based on system parameters; or

T and N are determined from the system parameters and the scaling factor.

7. The cell reselection method of claim 1, wherein the constraint is a permanent constraint or a temporary constraint.

8. A cell reselection method applied to a network node is characterized by comprising the following steps:

broadcasting the system information to the original serving cell and/or the candidate reselection neighbor cell, wherein the constraint conditions are newly added in the reselection evaluation process and used for limiting the neighbor cell with the ping-pong reselection problem before re-reselection; after the ping-pong cell reselection is determined to occur, the terminal adds a constraint condition for limiting the adjacent cell with the ping-pong reselection problem before re-reselection entering to the original serving cell and/or the candidate reselection adjacent cell in the next round of cell reselection evaluation process; performing cell reselection according to the newly added constraint condition;

The method comprises the following steps of adding a constraint condition for limiting a ping-pong reselection problem neighbor cell before re-reselection entering into an original serving cell, wherein the constraint condition comprises the following steps:

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

9. The cell reselection method of claim 8, wherein the step of broadcasting in the system information to the candidate reselection neighbor cell a constraint for limiting ping-pong reselection problem neighbor cells occurring before reselection into the candidate reselection neighbor cell is newly added in the reselection evaluation process comprises:

10. The cell reselection method of claim 8, wherein the step of broadcasting in the system information to the candidate reselection neighbor cell a constraint for limiting ping-pong reselection problem neighbor cells occurring before reselection into the candidate reselection neighbor cell is newly added in the reselection evaluation process comprises:

11. A terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor; wherein the processor implements the following steps when executing the program:

Performing cell reselection according to the newly added constraint condition;

wherein the processor is specifically configured to:

Q_{rxlevminoffset}presentation terminalPeriodically searching for high priority public land mobile network PLMN residing on virtual public land mobile network VPLMN_rxlevminAn added offset value;

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

12. Terminal according to claim 11, characterized in that Qpingpang_temp2The parameters are obtained by the terminal from the broadcasted system information.

13. The terminal of claim 11, wherein the processor is specifically configured to:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp+Qpingpang_temp4；

Q_Hysta hysteresis factor expressed as an increase in serving cell;

Qoffset_temprepresents a temporary offset value;

14. Terminal according to claim 13, characterized in that Qpingpang_temp4The parameters are obtained by the terminal from the broadcasted system information.

15. The terminal of claim 11, wherein the processor is specifically configured to:

16. The terminal of claim 15, wherein T and N are determined based on system parameters; or

T and N are determined from the system parameters and the scaling factor.

17. The terminal of claim 11, wherein the constraint is a permanent constraint or a temporary constraint.

18. A network node comprising a memory, a processor, a transceiver, and a computer program stored on the memory and executable on the processor; wherein the processor implements the following steps when executing the program:

broadcasting to the original serving cell and/or candidate reselection neighbor cell in the system information through the transceiver, wherein the constraint conditions are newly added in the reselection evaluation process and used for limiting the neighbor cell with ping-pong reselection problem before re-reselection; after the ping-pong cell reselection is determined to occur, the terminal adds a constraint condition for limiting the adjacent cell with the ping-pong reselection problem before re-reselection entering to the original serving cell and/or the candidate reselection adjacent cell in the next round of cell reselection evaluation process; performing cell reselection according to the newly added constraint condition;

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;

19. The network node of claim 18, wherein broadcasting in the system information to candidate reselection neighbor cells the constraints imposed during reselection evaluation to limit the occurrence of ping-pong reselection problem neighbor cells prior to re-reselection comprises:

20. The network node of claim 18, wherein broadcasting in the system information to candidate reselection neighbor cells the constraints imposed during reselection evaluation to limit the occurrence of ping-pong reselection problem neighbor cells prior to re-reselection comprises:

21. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the cell reselection method according to any one of claims 1 to 7; or

The program when executed by a processor implements the steps of a cell reselection method as claimed in any of claims 8 to 10.

22. A cell reselection device applied to a terminal is characterized by comprising:

the first reselection module is used for reselecting the cell according to a newly added constraint condition;

the first processing module is specifically configured to:

Qoffset_temprepresents a temporary offset value;

Q_qualmeasIndicating a measured cell reference signal reception quality value;

Q_qualminindicating cell attachmentA minimum received reference signal reception quality value;

23. The cell reselection device of claim 22, wherein the first processing module is specifically configured to:

R_s＝Q_meas,s+Q_Hyst-Qoffset_temp+Qpingpang_temp4；

Q_Hysta hysteresis factor expressed as an increase in serving cell;

Qoffset_temprepresents a temporary offset value;

24. The cell reselection device of claim 22, wherein the first processing module is specifically configured to:

Determining that the terminal has undergone ping-pong cell reselection; in the next round of cell reselection evaluation process, newly adding constraint conditions for limiting adjacent cells with ping-pong reselection problems before re-reselection entering into the original serving cell and/or the candidate reselection adjacent cell;

25. The cell reselection device of claim 22, wherein the constraint is a permanent constraint or a temporary constraint.

26. A cell reselection apparatus applied to a network node, comprising:

the second processing module is used for broadcasting the system information to the original serving cell and/or the candidate reselection neighboring cell, and adding a constraint condition for limiting the neighboring cell with ping-pong reselection problem before reselection entering in the reselection evaluation process; after the ping-pong cell reselection is determined to occur, the terminal adds a constraint condition for limiting the adjacent cell with the ping-pong reselection problem before re-reselection entering to the original serving cell and/or the candidate reselection adjacent cell in the next round of cell reselection evaluation process; performing cell reselection according to the newly added constraint condition;

Q_{rxlevminoffset}to representThe terminal is resided on a virtual public land mobile network VPLMN and gives Q when periodically searching the PLMN with high priority_rxlevminAn added offset value;

Qoffset_temprepresents a temporary offset value;

Q_qualmeasindicating a measured cell reference signal reception quality value;