CN116419337A

CN116419337A - Cell selection and reselection method and device, terminal equipment and network equipment

Info

Publication number: CN116419337A
Application number: CN202111669676.6A
Authority: CN
Inventors: 董静; 王启星; 刘光毅
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2023-07-11

Abstract

The application discloses a cell selection and reselection method and device, terminal equipment and network equipment, relates to the technical field of communication, and aims to solve the problem that the access rate of the existing visible light heterogeneous networking is low. The method comprises the following steps: the terminal equipment receives first information sent by a first service cell, wherein the first information comprises: second information indicating whether the first serving cell is allowed to camp on; third information indicating whether the first serving cell allows the second serving cell to be accessed; fourth information indicating an association relationship between the first serving cell and the second serving cell; fifth information indicating cell selection and reselection parameters corresponding to the first serving cell and/or cell selection and reselection parameters corresponding to the second serving cell; cell selection or cell reselection is performed based on the first information and target signal measurements of the first serving cell and/or the second serving cell. The embodiment of the application can reduce the access time delay and improve the access flow rate.

Description

Cell selection and reselection method and device, terminal equipment and network equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method and apparatus for selecting and reselecting a cell, a terminal device, and a network device.

Background

Indoor visible light communication (Visible Light Communication, VLC) is a novel indoor access network technology which uses high-speed flickering of LED lamps to transmit information, takes free space as a transmission channel and is high-speed and environment-friendly. In practical application, the difficulty of implementing visible light uplink is high, and VLC is generally combined with other wireless access modes to carry out heterogeneous networking.

As shown in fig. 1, the existing visible light heterogeneous networking initial access flow is as follows: the terminal carries out a series of processes such as synchronization, random access and the like through a radio frequency uplink and a radio frequency downlink, and firstly accesses to a radio frequency base station; the terminal measures the quality of the synchronous signals or the reference signals of all the visible light base stations which can be received, and reports the quality to the radio frequency base station through the radio frequency uplink; the radio base station selects the one with the best quality, and adds the selected base station by radio resource control (Radio Resource Control, RRC) reconfiguration. The access process of the existing visible light heterogeneous network is longer, and the access rate is lower.

Disclosure of Invention

The embodiment of the application provides a cell selection and reselection method and device, terminal equipment and network equipment, which are used for solving the problems that the access process of the existing visible light heterogeneous network is longer and the access rate is lower.

In a first aspect, an embodiment of the present application provides a cell selection and reselection method, which is performed by a terminal device, where the method includes:

receiving first information sent by a first service cell, wherein the first information comprises:

second information indicating whether the first serving cell allows camping;

third information indicating whether the first serving cell allows access of a second serving cell;

fourth information indicating an association relationship between the first serving cell and the second serving cell;

fifth information, the fifth information indicating cell selection and reselection parameters corresponding to the first serving cell and/or cell selection and reselection parameters corresponding to the second serving cell;

cell selection or cell reselection is performed based on the first information and a target signal measurement of the first serving cell and/or the second serving cell.

Optionally, the first serving cell is a radio frequency cell, and the second serving cell is a visible light cell.

Optionally, the performing cell selection based on the first information and the target signal measurement result of the first serving cell and/or the second serving cell includes:

Determining, based on the first information, a first serving cell and its associated second serving cell that are allowed to camp on;

measuring target signals of the first service cell and the second service cell related to the first service cell, and acquiring target signal measurement results of at least one of Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ) of the first service cell and the second service cell related to the first service cell;

and determining that the first service cell and the associated target second service cell meet an S criterion based on a target signal measurement result of the first service cell and the associated second service cell, selecting to reside the first service cell and the associated target second service cell, wherein the target second service cell is one of the second service cells associated with the first service cell and meets the S criterion, and the S criterion related parameter is obtained based on the first information.

Optionally, the performing cell reselection based on the first information and the target signal measurement result of the first serving cell and/or the second serving cell includes:

determining a cell reselection priority and a cell reselection criterion based on the first information;

And determining a reselected cell based on the cell reselection priority and a cell reselection criterion and a target signal measurement result of the first serving cell and a target second serving cell associated with the first serving cell selected by the cell, wherein the target second serving cell is one of the second serving cells associated with the first serving cell.

Optionally, the cell reselection priority indicates at least one of a priority relationship between a first neighboring cell and the first serving cell and a target second serving cell associated with the first serving cell, and a priority relationship between a second neighboring cell and the first serving cell and a target second serving cell associated with the first serving cell, wherein the first neighboring cell is a first neighboring serving cell and a second neighboring serving cell associated with the first neighboring cell, and the second neighboring cell is a third neighboring serving cell;

the determining a reselection cell based on the cell reselection priority and cell reselection criteria, and target signal measurements of the first serving cell and its associated target second serving cell of the cell selection, comprises:

determining whether to start target signal measurement of other cells according to the priority relation indicated by the cell reselection priority and the target signal measurement result of the first service cell and the associated target second service cell selected by the cell, and measuring the target signal quality of the other cells under the condition of determining to start measurement; the other cells comprise at least one of the first adjacent cell, the second adjacent cell and other second service cells related to the first service cell, wherein the other second service cells are second service cells related to the first service cell except the target second service cell;

And determining a reselected cell according to the target signal measurement results of the first serving cell and the target second serving cell associated with the first serving cell, the target signal measurement results of the other cells and the cell reselection criteria.

Optionally, the determining whether to start the measurement of the target signal of the other cell according to the priority relation indicated by the cell reselection priority and the target signal measurement result of the first serving cell and the associated target second serving cell of the cell selection, and measuring the target signal quality of the other cell if it is determined to start the measurement includes:

determining whether an RSRP value of the target second serving cell is greater than a first threshold value and whether an RSRQ value of the target second serving cell is greater than a second threshold value, if the cell reselection priority indicates that the first neighbor cell and the first serving cell and the target second serving cell associated therewith are the same priority, the first neighbor cell is lower than the first serving cell and the target second serving cell associated therewith or the second neighbor cell is lower than the first serving cell and the target second serving cell associated therewith;

Under the condition that the RSRP value of the target second serving cell is larger than the first threshold value and the RSRQ value of the target second serving cell is larger than the second threshold value, target signal measurement of other cells is not started;

and under the condition that the RSRP value of the target second serving cell is smaller than or equal to the first threshold value or the RSRQ value of the target second serving cell is smaller than or equal to the second threshold value, starting target signal measurement of other cells, wherein the other cells at least comprise the other second serving cells.

Optionally, the cell reselection priority indicates that the first neighbor cell is the same priority as the first serving cell and its associated target second serving cell;

the determining a reselection cell according to the target signal measurement result of the first serving cell and the target second serving cell associated with the first serving cell, the target signal measurement result of the other cells, and the cell reselection criterion includes:

calculating an RSRP value of a local cell and an RSRP value of each cell in the other cells according to a target signal measurement result of the first serving cell selected by the cell and a target second serving cell associated with the first serving cell, target signal measurement results of the other cells and the cell reselection criterion, wherein the local cell at least comprises the target second serving cell;

And determining the cell with the largest RSRP value in the own cell and other cells to reselect the cell.

Optionally, the cell reselection priority indicates that the first neighboring cell has a priority lower than the first serving cell and its associated target second serving cell, or the cell reselection priority indicates that the second neighboring cell has a priority lower than the first serving cell and its associated target second serving cell;

and determining a reselected cell according to the RSRP value of each cell in the other cells and the RSRP value of the cell.

Optionally, in the case that the RSRP value of the target second serving cell is greater than the first threshold value and the RSRQ value of the target second serving cell is greater than the second threshold value, the method does not start measurement of the target signal of the other cell, including:

when the RSRP value of the target second serving cell is greater than the first threshold value, and the RSRQ value of the target second serving cell is greater than the second threshold value, and the first weighted RSRQ value is greater than the third threshold value, and the first weighted RSRQ value is greater than the fourth threshold value, target signal measurement of other cells is not started, wherein the first weighted RSRP value is a weighted sum of the RSRP value of the first serving cell and the RSRP value of the target second serving cell, and the first weighted RSRQ value is a weighted sum of the RSRQ value of the first serving cell and the RSRQ value of the target second serving cell;

the determining whether to start the measurement of the target signal of the other cell according to the priority relation indicated by the cell reselection priority and the target signal measurement result of the first serving cell and the associated target second serving cell of the cell selection, and measuring the target signal quality of the other cell if the determination is made that the measurement is started, further includes:

And if the first weighted RSRP value is less than or equal to the third threshold value or the first weighted RSRQ value is less than or equal to the fourth threshold value, starting target signal measurement of the other second serving cell and the first neighbor cell.

Optionally, in the case of initiating target signal measurements on the other second serving cell and the first neighbor cell, the cell reselection criterion comprises a first R criterion comprising:

the RSRP value R of the first serving cell and the associated target second serving cell _s1 ＝αQ _{meas_s} +βQ _{meas_v_s} +Q _Hyst +Q _{Hyst_v} –Q _offsettemp –Q _{offsettemp_v} ；

The RSRP value R of the first serving cell and the other associated second serving cells _s2 ＝αQ _{meas_s} +βQ _{meas_v_s} +Q _Hyst –Q _{offset_v} –Q _offsettemp –Q _{offsettemp_v} ；

The RSRP value R of the first adjacent service cell and the second adjacent service cell _n ＝αQ _{meas_n} +βQ _{meas_v_n} –Q _offset –Q _{offset_v} –Q _offsettemp –Q _{offsettemp_v} ；

Wherein α and β are weights of the two associated serving cells, Q _{meas_s} For the RSRP value, Q, of the first serving cell _{meas_v_s} For the RSRP value, Q of the target second serving cell _{meas_n} For the RSRP value, Q, of the first neighbor serving cell _{meas_v_n} For the RSRP value, Q, of the second neighbor serving cell associated with the first neighbor serving cell _Hyst For the first service smallReselection hysteresis value, Q of region _{Hyst_v} Reselection hysteresis, Q, for the target second serving cell _offsettemp And Q _{offsettemp_v} Timeout penalty factors, Q, respectively for associated two serving cells _offset For the offset between the first serving cell and the first neighbor serving cell, Q _{offset_v} Is an offset between the target second serving cell and the second neighbor serving cell.

Optionally, the starting the target signal measurement for other cells when the RSRP value of the target second serving cell is less than or equal to the first threshold value or the RSRQ value of the target second serving cell is less than or equal to the second threshold value includes:

starting target signal measurement of the other second serving cells under the condition that the RSRP value of the target second serving cell is smaller than or equal to the first threshold value or the RSRQ value of the target second serving cell is smaller than or equal to the second threshold value;

the cell reselection criteria include a second R criterion and a third R criterion; the calculating the RSRP value of the own cell and the RSRP value of each cell in the other cells according to the target signal measurement result of the first serving cell and the target second serving cell associated with the first serving cell, the target signal measurement result of the other cells, and the cell reselection criterion, including:

Calculating RSRP values of the target second serving cell and the other second serving cells according to the target signal measurement results of the first serving cell and the target second serving cell related to the first serving cell selected by the cell, the target signal measurement results of the other second serving cells and the second R criterion;

the determining that the cell with the largest RSRP value in the own cell and other cells is the reselected cell comprises the following steps:

determining a cell with the maximum RSRP value in the target second serving cell and the other second serving cells as a cell to be selected;

determining that the cell to be selected is a reselected cell when a second weighted RSRP value is larger than a third threshold value, wherein the second weighted RSRP value is a weighted sum of the RSRP value of the first serving cell and the RSRP value of the cell to be selected;

under the condition that the second weighted RSRP value is smaller than or equal to the third threshold value, target signal measurement of the first neighbor cell is started, wherein the first neighbor cell is a first neighbor service cell and a second neighbor service cell related to the first neighbor cell;

calculating RSRP values of the first serving cell and the associated cells to be selected and the first neighbor serving cell and the associated second neighbor serving cell according to the target signal measurement results of the first serving cell and the associated cells to be selected, the target signal measurement results of the first neighbor serving cell and the associated second neighbor serving cell and the third R criterion;

And determining the first service cell and the associated cell to be selected and the cell with the largest RSRP value in the first neighbor service cell and the associated second neighbor service cell to be reselected.

Starting target signal measurement of the other second serving cell in the case that the first weighted RSRP value is less than or equal to the third threshold value or the first weighted RSRQ value is less than or equal to the fourth threshold value;

and when the RSRP value of the target second serving cell is less than or equal to the first threshold value, or the RSRQ value of the target second serving cell is less than or equal to the second threshold value, starting target signal measurement of other cells, including:

and under the condition that the RSRP value of the target second serving cell is smaller than or equal to the first threshold value or the RSRQ value of the target second serving cell is smaller than or equal to the second threshold value, starting target signal measurement of other second serving cells.

Optionally, the cell reselection priority indicates that the priority of the first neighboring cell is lower than the first serving cell and the associated target second serving cell, and the cell reselection criteria includes a second R criterion;

the calculating the RSRP value of the own cell and the RSRP value of each cell in the other cells according to the target signal measurement result of the first serving cell and the target second serving cell associated with the first serving cell, the target signal measurement result of the other cells, and the cell reselection criterion, including:

Calculating RSRP values of the target second serving cell and the other second serving cells according to the target signal measurement result of the target second serving cell, the target signal measurement result of the other second serving cells and the second R criterion;

the determining the reselecting cell according to the RSRP value of each cell in the other cells and the RSRP value of the own cell comprises the following steps:

when the second weighted RSRP value is smaller than a seventh threshold value, and the third weighted RSRP value is measured to be continuously longer than an eighth threshold value, and the residence time of the first serving cell and the target second serving cell is longer than a second duration, the terminal equipment determines that the first neighboring serving cell and the target second neighboring serving cell related to the first neighboring serving cell are reselected cells;

The target second neighbor serving cell is one of second neighbor serving cells associated with the first neighbor serving cell, and the third weighted RSRP value is a weighted sum of the RSRP value of the first neighbor serving cell and the RSRP value of the target second neighbor serving cell.

Optionally, the cell reselection priority indicates that the second neighboring cell has a priority lower than that of the first serving cell and its associated target second serving cell, and the cell reselection criteria includes a second R criterion;

under the condition that the second weighted RSRP value is smaller than or equal to the third threshold value, target signal measurement of the second adjacent cell is started, wherein the second adjacent cell is a third adjacent service cell;

and when the second weighted RSRP value is smaller than a ninth threshold value and the RSRP value of the target third neighbor serving cell is measured to last for a first time to reach a tenth threshold value and the residence time of the first serving cell and the target second serving cell reaches a second time, determining that the target third neighbor serving cell is a reselection cell, wherein the target third neighbor serving cell is one of the third neighbor serving cells.

Optionally, the determining a reselection cell based on the cell reselection priority and cell reselection criteria, and target signal measurement results of the first serving cell and its associated target second serving cell of the cell selection, includes:

Starting target signal measurement of the first neighbor cell when the cell reselection priority indicates that the priority of the first neighbor cell is higher than that of the first serving cell and a target second serving cell related to the first neighbor cell, wherein the first neighbor cell is the first neighbor serving cell and the second neighbor serving cell related to the first neighbor cell;

when the fourth weighted RSRP value is measured to be longer than a fifth threshold value or the second weighted RSRQ value is measured to be longer than the first threshold value and longer than a second threshold value, and the residence time of the first serving cell and the target second serving cell is measured to be longer than a second time, determining that the first neighboring serving cell and the target second neighboring serving cell related to the first neighboring serving cell are reselected cells;

the target second neighbor serving cell is one of second neighbor serving cells associated with the first neighbor serving cell, the fourth weighted RSRP value is a weighted sum of the RSRP value of the first neighbor serving cell and the RSRP value of the target second neighbor serving cell, and the second weighted RSRQ value is a weighted sum of the RSRQ value of the first neighbor serving cell and the RSRQ value of the target second neighbor serving cell.

Optionally, the second R criterion includes:

the RSRP value R of the first serving cell and the associated target second serving cell _{s1_v} ＝Q _{meas_v_s} +Q _{Hyst_v} –Q _{offsettemp_v} ；

The RSRP value R of the first serving cell and the other associated second serving cells _{s2_v} ＝Q _{meas_v_s} –Q _{offset_v} –Q _{offsettemp_v} ；

Wherein Q is _{meas_v_s} For the RSRP value, Q of the target second serving cell _{Hyst_v} Reselection hysteresis, Q, for the target second serving cell _{offsettemp_v} To correlate the timeout penalty factor of the second serving cell, Q _{offset_v} Is an offset between the target second serving cell and the other second serving cells.

Optionally, the third R criterion includes:

the RSRP value R of the first serving cell and the associated candidate cell _s3 ＝αQ _{meas_s} +βQ _{meas_v_s} +Q _Hyst +Q _{Hyst_v} –Q _offsettemp –Q _{offsettemp_v} ；

Wherein α and β are weights of the associated two serving cells, respectivelyHeavy, Q _{meas_s} For the RSRP value, Q, of the first serving cell _{meas_v_s} For the RSRP value, Q of the target second serving cell _{meas_n} For the RSRP value, Q, of the first neighbor serving cell _{meas_v_n} For the RSRP value, Q, of the second neighbor serving cell associated with the first neighbor serving cell _Hyst For the reselection hysteresis value, Q, of the first serving cell _{Hyst_v} Reselection hysteresis, Q, for the target second serving cell _offsettemp And Q _{offsettemp_v} Timeout penalty factors, Q, respectively for associated two serving cells _offset For the offset between the first serving cell and the first neighbor serving cell, Q _{offset_v} Is an offset between the target second serving cell and the other second serving cells.

In a second aspect, embodiments of the present application further provide another cell selection and reselection method, performed by a network device, the method comprising:

transmitting first information to a terminal device, so that the terminal device performs cell selection or cell reselection according to the first information and a target signal measurement result of a first service cell and/or a second service cell;

wherein the first information includes:

second information indicating whether the first serving cell allows camping;

and fifth information, wherein the fifth information indicates cell selection and reselection parameters corresponding to the first serving cell and/or cell selection and reselection parameters corresponding to the second serving cell.

In a third aspect, embodiments of the present application further provide a cell selection and reselection apparatus, including:

The receiving module is configured to receive first information sent by a first serving cell, where the first information includes:

second information indicating whether the first serving cell allows camping;

and the execution module is used for executing cell selection or cell reselection based on the first information and the target signal measurement result of the first service cell and/or the second service cell.

Optionally, the execution module includes:

a first determining sub-module for determining, based on the first information, a first serving cell and its associated second serving cell allowed to camp on;

a measurement submodule, configured to measure a target signal of the first serving cell and an associated second serving cell, and obtain a target signal measurement result of at least one of a reference signal received power RSRP and a reference signal received quality RSRQ of the first serving cell and the associated second serving cell;

And the cell selection sub-module is used for determining that the first serving cell and the associated target second serving cell meet an S criterion based on the target signal measurement result of the first serving cell and the associated second serving cell, selecting to reside the first serving cell and the associated target second serving cell, wherein the target second serving cell is one of the second serving cells associated with the first serving cell and meets the S criterion, and the S criterion related parameter is obtained based on the first information.

Optionally, the execution module includes:

a second determining sub-module for determining a cell reselection priority and a cell reselection criterion based on the first information;

and a third determining sub-module, configured to determine a reselection cell based on the cell reselection priority and a cell reselection criterion, and a target signal measurement result of the first serving cell and its associated target second serving cell, which is one of the second serving cells associated with the first serving cell, for the cell selection.

The third determination submodule includes:

the processing unit is used for determining whether to start target signal measurement of other cells according to the priority relation indicated by the cell reselection priority and the target signal measurement result of the first service cell and the associated target second service cell selected by the cell, and measuring the target signal quality of the other cells under the condition of determining to start measurement; the other cells comprise at least one of the first adjacent cell, the second adjacent cell and other second service cells related to the first service cell, wherein the other second service cells are second service cells related to the first service cell except the target second service cell;

and the determining unit is used for determining a reselected cell according to the target signal measurement result of the first service cell and the target second service cell related to the first service cell, the target signal measurement result of the other cells and the cell reselection criterion.

Optionally, the processing unit includes:

a first determining subunit, configured to determine, when the cell reselection priority indicates that the first neighboring cell has the same priority as the first serving cell and its associated target second serving cell, that the priority of the first neighboring cell is lower than the first serving cell and its associated target second serving cell, or that the priority of the second neighboring cell is lower than the first serving cell and its associated target second serving cell, whether an RSRP value of the target second serving cell is greater than a first threshold value, and whether an RSRQ value of the target second serving cell is greater than a second threshold value;

A first processing subunit, configured to not start target signal measurement for other cells when the RSRP value of the target second serving cell is greater than the first threshold value and the RSRQ value of the target second serving cell is greater than the second threshold value;

and the second processing subunit is configured to initiate measurement of a target signal of another cell when the RSRP value of the target second serving cell is less than or equal to the first threshold value or the RSRQ value of the target second serving cell is less than or equal to the second threshold value, where the other cell at least includes the other second serving cell.

Optionally, the cell reselection priority indicates that the first neighboring cell and the first serving cell and an associated target second serving cell are the same priority;

the determination unit includes:

a first calculating subunit, configured to calculate, according to a target signal measurement result of the first serving cell and a target second serving cell associated with the first serving cell, a target signal measurement result of the other cell, and the cell reselection criterion, an RSRP value of a home cell and an RSRP value of each cell in the other cell, where the home cell at least includes the target second serving cell;

And the second determining subunit is used for determining the cell with the largest RSRP value in the own cell and other cells to reselect the cell.

the determination unit includes:

a second calculating subunit, configured to calculate, according to a target signal measurement result of the first serving cell and a target second serving cell associated with the first serving cell, a target signal measurement result of the other cell, and the cell reselection criterion, an RSRP value of a home cell and an RSRP value of each cell in the other cell, where the home cell at least includes the target second serving cell;

and the third determining subunit is used for determining a reselected cell according to the RSRP value of each cell in the other cells and the RSRP value of the own cell.

Optionally, the first processing subunit is configured to:

The processing unit is used for:

Wherein α and β are weights of the two associated serving cells, Q _{meas_s} For the RSRP value, Q, of the first serving cell _{meas_v_s} For the RSRP value, Q of the target second serving cell _{meas_n} For the RSRP value, Q, of the first neighbor serving cell _{meas_v_n} For the RSRP value, Q, of the second neighbor serving cell associated with the first neighbor serving cell _Hyst For the reselection hysteresis value, Q, of the first serving cell _{Hyst_v} Reselection hysteresis, Q, for the target second serving cell _offsettemp And Q _{offsettemp_v} Timeout penalty factors, Q, respectively for associated two serving cells _offset For the offset between the first serving cell and the first neighbor serving cell, Q _{offset_v} Is an offset between the target second serving cell and the second neighbor serving cell.

Optionally, the second processing subunit is configured to:

the cell reselection criteria include a second R criterion and a third R criterion; the first computing subunit is configured to:

the second determining subunit is configured to:

Optionally, the first processing subunit is configured to:

The processing unit further includes:

a third processing unit, configured to initiate target signal measurement for the other second serving cell when the first weighted RSRP value is less than or equal to the third threshold value, or the first weighted RSRQ value is less than or equal to the fourth threshold value;

the second processing subunit is configured to:

the second computing subunit is configured to:

the third determining subunit is configured to:

the second computing subunit is configured to:

the third determining subunit is configured to:

Optionally, the third determining submodule is configured to:

Optionally, the second R criterion includes:

the first service cell and its associated target second serviceRSRP value R of serving cell _{s1_v} ＝Q _{meas_v_s} +Q _{Hyst_v} –Q _{offsettemp_v} ；

Optionally, the third R criterion includes:

Wherein α and β are weights of the two associated serving cells, Q _{meas_s} For the RSRP value, Q, of the first serving cell _{meas_v_s} For the RSRP value, Q of the target second serving cell _{meas_n} For the RSRP value, Q, of the first neighbor serving cell _{meas_v_n} For the RSRP value, Q, of the second neighbor serving cell associated with the first neighbor serving cell _Hyst For the reselection hysteresis value, Q, of the first serving cell _{Hyst_v} Reselection hysteresis, Q, for the target second serving cell _offsettemp And Q _{offsettemp_v} Timeout penalty factors, Q, respectively for associated two serving cells _offset For the offset between the first serving cell and the first neighbor serving cell, Q _{offset_v} For the target second serving cell and the target second serving cellAnd the offset between the other second serving cells.

In a fourth aspect, embodiments of the present application further provide a cell selection and reselection apparatus, including:

a sending module, configured to send first information to a terminal device, so that the terminal device performs cell selection or cell reselection according to the first information and a target signal measurement result of a first serving cell and/or a second serving cell;

wherein the first information includes:

second information indicating whether the first serving cell allows camping;

In a fifth aspect, embodiments of the present application further provide a terminal device, including: a transceiver and a processor; wherein, the liquid crystal display device comprises a liquid crystal display device,

The transceiver is configured to receive first information sent by a first serving cell, where the first information includes:

second information indicating whether the first serving cell allows camping;

the processor is configured to perform cell selection or cell reselection based on the first information and a target signal measurement result of the first serving cell and/or the second serving cell.

In a sixth aspect, embodiments of the present application further provide a network device, including: a transceiver and a processor; wherein, the liquid crystal display device comprises a liquid crystal display device,

the transceiver is configured to send first information to a terminal device, so that the terminal device performs cell selection or cell reselection according to the first information and a target signal measurement result of a first serving cell and/or a second serving cell;

Wherein the first information includes:

second information indicating whether the first serving cell allows camping;

In a seventh aspect, embodiments of the present application further provide a communication device, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the cell selection and reselection method as described in the first aspect when the computer program is executed; alternatively, the steps in the cell selection and reselection method as described in the second aspect are implemented.

In an eighth aspect, embodiments of the present application further provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the cell selection and reselection method according to the first aspect; alternatively, the steps in the cell selection and reselection method as described in the second aspect are implemented.

In this embodiment of the present application, a terminal device receives first information sent by a first serving cell, where the first information includes: second information indicating whether the first serving cell allows camping; third information indicating whether the first serving cell allows access of a second serving cell; fourth information indicating an association relationship between the first serving cell and the second serving cell; fifth information, the fifth information indicating cell selection and reselection parameters corresponding to the first serving cell and/or cell selection and reselection parameters corresponding to the second serving cell; cell selection or cell reselection is performed based on the first information and a target signal measurement of the first serving cell and/or the second serving cell. In this way, the terminal equipment directly selects the cell to access or reselect the cell based on the first information sent by the service cell, so that the measurement report of the terminal equipment and the reconfiguration process of the network equipment are omitted, the access time delay can be reduced, and the access process rate can be improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flow chart of the initial access of the visible light heterogeneous network in the prior art;

FIG. 2 is a schematic diagram of a network architecture of a heterogeneous network of visible light communications;

fig. 3 is an improved visible light heterogeneous networking initial access flow chart provided in an embodiment of the present application;

fig. 4 is one of flowcharts of a cell selection and reselection method provided in an embodiment of the present application;

fig. 5 is a second flowchart of a cell selection and reselection method provided in an embodiment of the present application;

fig. 6 is one of the schematic diagrams of the visible light heterogeneous networking provided in the embodiment of the present application;

fig. 7a is a cell reselection flow chart in the case of the same priority as an associated radio frequency cell provided in an embodiment of the present application;

fig. 7b is a cell reselection flow chart under a high priority condition of an associated radio frequency cell provided in an embodiment of the present application;

fig. 7c is a cell reselection flow chart under a low priority condition of an associated radio frequency cell provided in an embodiment of the present application;

FIG. 8 is a schematic diagram of a second embodiment of a visible light heterogeneous network;

fig. 9 is a cell reselection flow chart under a low priority condition of a common radio frequency cell provided in an embodiment of the present application;

fig. 10 is one of the block diagrams of the cell selection and reselection apparatus provided in the embodiment of the present application;

fig. 11 is a second block diagram of a cell selection and reselection apparatus provided in an embodiment of the present application;

Fig. 12 is a block diagram of a communication device provided in an embodiment of the present application.

Detailed Description

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

The indoor visible light communication VLC is a novel indoor access network technology which uses high-speed flickering of LED lamps to transmit information and uses free space as a transmission channel, and is high-speed and environment-friendly. Because the light emitted by the LED light source has certain directivity, the coverage area of the LED light source is smaller, and when a user moves to an area which is not covered by visible light communication, the service is interrupted; furthermore, VLC is susceptible to obstruction, resulting in interruption of the communication link, as compared to the penetrability of wireless communications. Meanwhile, in practical application, the difficulty of realizing visible light uplink is high, and VLC is generally combined with other wireless access modes to carry out heterogeneous networking. Taking radio frequency access as an example, in the visible light communication heterogeneous networking, it is assumed that visible light only has downlink and no uplink, and the radio frequency links exist in uplink and downlink, and the visible light communication heterogeneous networking is shown in fig. 2.

As shown in fig. 1, in the existing initial access procedure of the visible light heterogeneous network, in order for a terminal to access a visible light base station, the terminal needs to access a radio frequency base station first, report all measured downlink quality of visible light to the radio frequency base station, and then add an appropriate visible light base station to communicate through the radio frequency base station, which is a tedious process. In the application, the terminal is considered to directly select the visible light downlink to access in the radio frequency access stage, and measurement reporting and radio frequency base station reconfiguration processes are omitted, so that the purposes of reducing initial access time delay and improving access process rate are achieved, and the improved visible light heterogeneous networking initial access process is shown in a figure 3.

In general, after the terminal is started, firstly, selecting a public land mobile network (Public Land Mobile Network, PLMN), then selecting/reselecting a cell, registering a location, and the like, wherein the selection and the location registration of the PLMN mainly are Non-access stratum (NAS) functions, which are temporarily not considered; and then the terminal initiates a random access process to the resident cell to acquire uplink synchronization. In the improved initial access flow of the visible light heterogeneous network, a terminal can search a plurality of radio frequency cells and visible light cells in the cell searching process, and how to reside in a proper radio frequency cell and a proper visible light cell through cell selection and cell reselection needs to be specifically designed.

For the sake of clarity of the embodiments of the present application, the following is a brief description of conventional cell selection and reselection schemes in the related art:

1. purpose of cell selection

The conventional cell selection (cell selection) refers to selecting a cell with channel quality meeting the condition as soon as possible to reside after the terminal is powered on, and mainly includes two types:

1) Initial cell selection

The UE does not store any a priori information to help it identify specific frequencies, so the UE needs to scan all Radio frequency channels (RF channels) on a New Radio, NR, band according to its own capabilities, on each frequency the UE only needs to search for the cell with the best channel quality, once a suitable cell appears, the UE will select and camp on.

2) Cell selection based on stored information

The UE has stored carrier frequency related information and may also include some cell parameter information, such as from previously received measurement control information or previously camped/detected cells. The UE will preferentially select the cell with the relevant information, and once a suitable cell appears, the UE will select it and camp on, and if none of the cells storing the relevant information are suitable, the UE will initiate the initial cell selection procedure.

2. S criterion for cell selection

If a UE wants to camp on a cell, the cell needs to satisfy the following conditions:

srxlev >0, and square >0

Wherein srxlev=q _rxlevmeas –(Q _rxlevmin +Q _{rxlevminoffset} )–Pcompensation-Q _offsettemp ；

Squal＝Q _qualmeas –(Q _qualmin +Q _{qualminoffset} )-Q _offsettemp 。

The definitions of the relevant parameters are shown in the following table:

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if Srxlev >0 and square >0, then the UE considers that the cell meets the channel quality requirement of cell selection, can select the cell as a camping cell, and if the system information of the cell indicates that the cell allows camping, the UE can select to camp on the cell and enter an idle state.

3. Cell reselection purposes

Cell reselection (cell reselection) refers to a process in which a UE provides a service signal by monitoring signal quality of neighbor cells and a current cell in an idle mode to select one of the best cells. When the signal quality and power of the neighbor cell meet the S criterion and meet a certain reselection decision criterion, the terminal will access the cell to reside.

4. Measurement start condition

The conditions for starting to measure the signal quality of other cells are as follows:

5. reselection rules

The cell reselection rules are as follows:

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as can be seen from the above description, the conventional cell selection and cell reselection are only applicable to a single serving cell, and in the improved initial access procedure of the visible light heterogeneous network, the cell selection and reselection obtain the most suitable radio frequency cell and visible light cell pair, so that the conventional cell selection and reselection procedure cannot be completed.

In the present application, the radio frequency link may be a cellular network (4G/5G, etc.) uplink and downlink; through a cell selection and reselection method of the visible light heterogeneous network, the most suitable radio frequency cell and the most suitable visible light cell can be resided at the same time, the realization of the subsequent random access flow is assisted, the time delay of the terminal accessing to the visible light base station is reduced, and the access flow rate is improved.

Referring to fig. 4, fig. 4 is a flowchart of a cell selection and reselection method provided in an embodiment of the present application, which is performed by a terminal device, as shown in fig. 4, and includes the steps of:

step 401, receiving first information sent by a first serving cell, where the first information includes:

second information indicating whether the first serving cell allows camping;

The first serving cell may be a cell in which the first network device provides network access services. In this embodiment of the present application, the first serving cell may be a cell associated with one or more second serving cells, that is, the first serving cell and the second serving cell may perform heterogeneous networking, and the second serving cell may be a cell where the second network device provides network access service. The second serving cell associated with the first serving cell may refer to a second serving cell within a coverage area of the first serving cell.

In one embodiment, the first serving cell is a radio frequency cell, and the second serving cell is a visible light cell. That is, the first serving cell may be a cell corresponding to a radio frequency base station, that is, a radio frequency cell, and the second serving cell is a visible light cell within a coverage area of the radio frequency cell.

In this way, the terminal device can access both the radio frequency cell and its associated visible light cell.

The first information may be sent to the terminal device by the first serving cell or the first network device through the downlink, and the first information may also be transmitted in the system information, or the first information is the system information. For example, the terminal device may receive, via the radio frequency downlink, the synchronization signal and the system information sent by the radio frequency base station, and carry a plurality of indication information in the system information, that is, the first information includes multiple or all of the second information, the third information, the fourth information, and the fifth information.

The second information may be information indicating whether the first serving cell is allowed to camp, if so, the terminal device may select to camp on the first serving cell, otherwise, the terminal device cannot camp on the first serving cell.

The third information may be indicating whether the first serving cell allows the second serving cell to access, and if the first serving cell allows the second serving cell to allow the second serving cell to access, the terminal device may select to camp on the first serving cell and its associated second serving cell at the same time.

The fourth information may be an ID indicating an association between the first serving cell and the second serving cell, for example, may indicate the second serving cell associated with the first serving cell, so that the terminal device may learn which serving cells the first serving cell is associated with.

The fifth information may be a cell selection and reselection parameter corresponding to the first serving cell and/or a cell selection and reselection parameter corresponding to the second serving cell, which are used when the terminal device performs cell selection and reselection, to determine a selected or reselected serving cell. The cell selection and reselection parameters may include related parameters such as a cell reselection priority, a cell reselection rule, etc., and the terminal device may determine whether to select a first serving cell or reselect other serving cells according to the cell selection and reselection parameters corresponding to the first serving cell, and may determine which second serving cell is selected or whether to reselect other serving cells according to the cell selection and reselection parameters corresponding to the second serving cell.

When the fifth information indicates that the cell selection and reselection parameters corresponding to the first serving cell exist, the terminal device may determine whether the first serving cell meets a cell selection or reselection condition based on the cell selection and reselection parameters corresponding to the first serving cell, so as to determine whether to select or reselect the first serving cell; and when the fifth information does not indicate the cell selection and reselection parameters corresponding to the first serving cell, the first serving cell can be selected by default.

When the fifth information indicates that the cell selection and reselection parameters corresponding to the second serving cell exist, the terminal device can determine whether a cell meeting the condition of cell selection or reselection exists in the second serving cell based on the cell selection and reselection parameters corresponding to the second serving cell, so as to determine a selected or reselected target second serving cell; in this case, the cell selection and reselection parameters corresponding to the second serving cell may not be indicated in the fifth information, but the second serving cell may send an information indication to the terminal device alone.

When the fifth information indicates that there are the cell selection and reselection parameters corresponding to the first serving cell and the cell selection and reselection parameters corresponding to the second serving cell, the terminal device may determine, based on the cell selection and reselection parameters corresponding to the first serving cell, whether the first serving cell meets a condition of cell selection or reselection, and further determine whether to select or reselect the first serving cell, and in the case of determining to select or reselect the first serving cell, may further determine whether there is a cell meeting the condition of cell selection or reselection in the second serving cell, and further determine a target second serving cell of selection or reselection.

For example, the first serving cell is a radio frequency cell, the second serving cell is a visible light cell associated with the radio frequency cell, the terminal receives a synchronization signal and system information sent by a radio frequency base station through radio frequency downlink, the system information indicates whether the radio frequency cell allows residence, whether the radio frequency cell allows visible light access, a visible light cell ID associated with the radio frequency cell, a cell selection/reselection parameter, and the like.

It should be noted that, the cell selection and reselection parameters corresponding to the second serving cell may not be indicated in the first information sent by the first serving cell, but may be indicated in the system information sent by the second serving cell to the terminal device, that is, the cell selection and reselection parameters corresponding to the first serving cell and the cell selection and reselection parameters corresponding to the second serving cell may be indicated separately by respective serving cells. For example, the relevant cell selection parameters of the visible light cell associated with the radio frequency cell may also be configured in the system information of the visible light cell.

Step 402, performing cell selection or cell reselection based on the first information and a target signal measurement result of the first serving cell and/or the second serving cell.

The terminal device may determine to measure the target signal of the first serving cell and/or the second serving cell according to the related indication information in the first information, for example, when the second information in the first information indicates that the first serving cell is allowed to reside, the target signal of the first serving cell is measured, and when the third information in the first information indicates that the first serving cell is allowed to access the second serving cell, the fourth information in the first information indicates that the second serving cell ID associated with the first serving cell is measured. The target information may refer to a Reference Signal, such as a channel state information Reference Signal (Channel Status Information-Reference Signal, CSI-RS), a synchronization Signal block (Synchronization Signal Block, SSB), and the like.

It may then be determined whether to select to camp on the first serving cell and/or the second serving cell, or whether to continue camping on the first serving cell and/or the second serving cell, or whether to reselect to another serving cell, based on target signal measurements, such as reference signal received power (Reference Signal Receiving Power, RSRP), reference signal received quality (Reference Signal Receiving Quality, RSRQ), etc., for the first serving cell and/or the second serving cell, whether the signal quality of the first serving cell and/or the second serving cell meets relevant criteria for cell selection or relevant criteria for cell reselection.

Optionally, the step 402 includes:

That is, the first serving cell and the associated second serving cell allowed to camp on may be determined in the case that the first serving cell is indicated in the first information to allow camping, and the first serving cell is allowed to access the second serving cell.

Then, the target signal of the first serving cell and its associated second serving cell may be measured to obtain an RSRP value and/or an RSRQ value of the first serving cell and its associated second serving cell, and based on the target signal measurement result of the first serving cell and its associated second serving cell, it may be determined whether the first serving cell meets an S criterion for cell selection, and whether there is a target second serving cell in the second serving cell associated with the first serving cell that also meets an S criterion for cell selection.

In the case that the first serving cell and its associated target second serving cell meet the S criterion, the first serving cell and its associated target second serving cell may be selected to camp on, and the target second serving cell may be any one of the second serving cells associated with the first serving cell that meets the S criterion.

For example, if the terminal device wants to camp on a certain radio frequency cell and its associated visible light cell when performing cell selection, the following conditions need to be met:

a) Indicating that the radio frequency cell is allowed to reside in the system information;

b) Indicating the radio frequency cell to allow the visible light cell to be accessed in the system information;

c) The radio frequency cell meets the S criterion;

d) One of the visible light cells associated with the radio frequency cell satisfies the S criterion.

Wherein the S criteria may include:

srxlev >0 and square >0, wherein Srxlev is the RSRP value of the first service cell received by the terminal equipment, and square is the RSRQ value of the first service cell received by the terminal equipment; i.e. the first serving cell meets the S criterion;

Srxlev＝Q _rxlevmeas –(Q _rxlevmin +Q _{rxlevminoffset} )–Pcompensation–Q _offsettemp ；

Squal＝Q _qualmeas –(Q _qualmin +Q _{qualminoffset} )–Q _offsettemp ；

srxlev_v >0 and square_v >0, wherein Srxlev_v is an RSRP value of the second serving cell received by the terminal equipment, and square is an RSRQ value of the second serving cell received by the terminal equipment; i.e. any one of the second serving cells associated with the first serving cell meets the S criterion;

Srxlev_v＝Q _{rxlevmeas_v} –(Q _{rxlevmin_v} +Q _{rxlevminoffset_v} )–Pcompensation_v–Q _{offsettemp_v} ；

Squal_v＝Q _{qualmeas_v} –(Q _{qualmin_v} +Q _{qualminoffset_v} )–Q _{offsettemp_v} ；

wherein Q is _rxlevmeas For the RSRP value, Q of the first serving cell actually measured by the terminal device _rxlevmin Minimum RSRP value, Q, for first serving cell access _{rxlevminoffset} Accessing the minimum RSRP offset value for the first service cell, pcompensation is the maximum transmission power difference value between the maximum transmission power allowed by the first service cell and the terminal power class, Q _offsettemp A penalty factor introduced for the first serving cell for a number of T300 timeouts; q (Q) _qualmeas RSRQ value, Q for the first serving cell actually measured by the terminal _qualmin Minimum RSRQ value, Q for first serving cell access _{qualminoffset} The minimum RSRQ offset value is accessed for the first serving cell.

Q _{rxlevmeas_v} For the actually measured RSRP value, Q of the second serving cell of the terminal device _{rxlevmin_v} Minimum RSRP value, Q for second serving cell access _{rxlevminoffset_v} Accessing the minimum RSRP offset value for the second service cell, pcombination_v is the maximum transmission power difference value between the maximum transmission power allowed by the second service cell and the terminal power class, Q _{offsettemp_v} A penalty factor introduced for the second serving cell for multiple T300 timeouts; q (Q) _{qualmeas_v} RSRQ value, Q for the second serving cell actually measured by the terminal _{qualmin_v} Minimum RSRQ value, Q for second serving cell access _{qualminoffset_v} The minimum RSRQ offset value is accessed for the second serving cell.

These above parameters may be referred to as S-criterion related parameters, which may be obtained based on the first information, e.g. may be configured in the cell selection parameters corresponding to the first serving cell and the cell selections corresponding to the second serving cell.

In this way, the terminal device may determine, based on the first information sent by the first serving cell, a first serving cell and its associated second serving cell that are allowed to camp on, and determine, by measuring target signals of the first serving cell and its associated second serving cell, the first serving cell and its associated target second serving cell that satisfy the S criterion, thereby selecting to camp on the first serving cell and its associated target second serving cell. The embodiment provides a specific cell selection mode and ensures that two service cells with better signal quality are selected.

It should be noted that, in order to ensure that the terminal device accesses the radio frequency cell associated with the visible light cell preferentially, Q configured for such radio frequency cell may be configured in the system information _rxlevmin And Q _qualmin The smaller the common radio frequency cell (i.e. the radio frequency cell not associated with the visible light cell) is, the more difficult the common radio frequency cell is to meet the S criterion, the more difficult the UE is to select to camp on the cell. For simplicity of description, in the following schemes, the "radio frequency cell with associated visible light cell" is referred to as "associated radio frequency cell", and the "radio frequency cell without associated visible light cell" is referred to as "ordinary radio frequency cell".

and determining a reselection cell based on the cell reselection priority and a cell reselection criterion, and a target signal measurement result of the first serving cell and a target second serving cell associated with the first serving cell selected by the cell.

That is, the cell reselection priority and the cell reselection criterion may be determined according to the relevant indication information in the first information, such as the cell selection and reselection parameters corresponding to the first serving cell, and/or the cell selection and reselection parameters corresponding to the second serving cell, that is, the cell selection and reselection parameters may be configured in the first information to indicate the priority of each cell and the cell reselection criterion.

For example, in the present application, the cell selection phase resides temporarily in the associated radio frequency cell and its associated visible light cell. In the cell reselection phase, the priority of the normal radio frequency cell may be specified to be lower than the priority of the associated radio frequency cell, and the priority of other associated radio frequency cells may be the same as the priority of the associated radio frequency cell, or may be higher (e.g., less loaded) or lower (e.g., more loaded).

The cell reselection criteria may include calculation criteria for RSRP values of each serving cell in the case of different cell reselection priorities, and related reselection criteria calculation parameters.

In this embodiment, the target signals of the first serving cell and its associated second serving cell, where the terminal device resides when performing cell selection, may be measured to combine the cell reselection priorities and cell reselection criteria to determine whether to perform cell reselection and how to determine a target reselection cell. For example, it may be determined whether to initiate measurement of the target signal of the other cell based on the cell reselection priority and the target signal measurement results of the first serving cell and its associated second serving cell, and whether to reselect the cell and to which cell based on cell reselection criteria and the target signal measurement results of the other cell.

In this way, the reselection cell can be determined by the configured cell reselection priorities and cell reselection criteria, in combination with the target signal measurements for the currently camping cell, which embodiment provides a viable and efficient way of cell reselection.

Further, the cell reselection priority indicates at least one of a priority relation between the first neighbor cell and a first serving cell and a target second serving cell associated with the first serving cell, and a priority relation between a second neighbor cell and a target second serving cell associated with the first serving cell, wherein the first neighbor cell is a first neighbor serving cell and a second neighbor serving cell associated with the first neighbor serving cell, and the second neighbor cell is a third neighbor serving cell;

That is, in one embodiment, a reselection priority relationship of each different type of serving cell may be configured in the first information, so that the terminal device refers to the priority relationship, and determines at what time to start measurement on other cells, so as to perform cell reselection.

Specifically, the priority of the cell reselection may indicate a priority relationship between a first neighboring cell and the first serving cell and an associated target second serving cell thereof, for example, indicate that the first neighboring cell and the first serving cell and an associated target second serving cell thereof are the same, higher, or lower in priority, and the first neighboring cell may be a cell adjacent to the first serving cell and including an associated serving cell, that is, a first neighboring serving cell and an associated second neighboring serving cell thereof.

The priority of the cell reselection may also indicate a priority relationship between a second neighboring cell and the first serving cell and its associated target second serving cell, for example, indicate that the second neighboring cell and the first serving cell and its associated target second serving cell are the same, higher, or lower in priority, where the second neighboring cell may be a cell neighboring the first serving cell but not including the associated serving cell, that is, a separate third neighboring serving cell.

Taking the first service cell and the second service cell associated with the first service cell as an associated radio frequency cell and an associated visible light cell respectively as examples, the first adjacent cell can be an adjacent associated radio frequency cell and an associated visible light cell, and the second adjacent cell can be an adjacent common radio frequency cell.

In this embodiment, whether to initiate target signal measurement for other cells may be determined according to the priority relation indicated by the cell reselection priority and the target signal measurement result for the first serving cell and its associated target second serving cell currently camping. Under the condition that the signal quality of the current cell is good enough and the signal quality of other cells is poor, the measurement can be not started, and the current first service cell and the second service cell related to the current first service cell can be continuously resided; in the case of determining to start measurement, the signal quality of other cells, such as other second serving cells, first neighbor cells and/or second neighbor cells associated with the first serving cell, may be selected accordingly according to the priority of each cell and the signal quality of the first serving cell and its associated target second serving cell.

For example, in the case that the first serving cell and its associated target second serving cell have the same priority as other neighboring cells, the target signal measurement for other cells, such as other second serving cells and the first neighboring cells, may be started in the case that the target signal quality of the first serving cell and its associated target second serving cell is poor; under the condition that the priority of the first service cell and the associated target second service cell is lower, target signal measurement of other cells such as a first neighbor cell can be directly started; in case the first serving cell and its associated target second serving cell have a higher priority, target signal measurements for other cells, such as other second serving cells, may be initiated only in case the target signal quality of the first serving cell and its associated target second serving cell is poor, and in case the target signal quality of the first serving cell and its associated second serving cell is particularly poor.

Then, according to the target signal measurement results of the first serving cell and the associated target second serving cell, the target signal measurement results of the other cells and the cell reselection criteria, the cell with better signal quality meeting the cell reselection criteria can be determined to be a reselected cell, and the cell is reselected.

In this way, by determining whether to start measurement and reselection of the cell according to the configured priority condition of each cell and the cell signal quality, unnecessary signal measurement or reselection can be reduced, the terminal is ensured to reside in a proper cell, and frequent cell reselection is avoided.

In other words, in one embodiment, when the first neighbor cell and the first serving cell and the associated target second serving cell have the same priority, the first neighbor cell has a priority lower than the first serving cell and the associated target second serving cell, or the second neighbor cell has a priority lower than the first serving cell and the associated target second serving cell, it may be determined whether the RSRP value of the target second serving cell is greater than a first threshold, and whether the RSRQ value of the target second serving cell is greater than a second threshold, that is, whether the signal power and quality of the target second serving cell are good enough, according to the target signal measurement results of the first serving cell and the associated target second serving cell. Wherein the first threshold value and the second threshold value may also be configured in a cell reselection parameter in the first information.

And when the RSRP value of the target second serving cell is larger than the first threshold value and the RSRQ value of the target second serving cell is larger than the second threshold value, the signal quality of the target second serving cell is good, and the target second serving cell is not required to be reselected to other cells, so that the target signal measurement of other cells can be not started, and the target second serving cell can be continuously resided.

And when the RSRP value of the target second serving cell is smaller than or equal to the first threshold value or the RSRQ value of the target second serving cell is smaller than or equal to the second threshold value, indicating that the signal quality of the target second serving cell is not good, reselecting to other cells to ensure the network service quality of the terminal equipment, and thus starting the measurement of the target signal of the other cells, wherein the other cells at least comprise the other second serving cells, namely at least starting the measurement of other second serving cells, except for the target second serving cell, associated with the first serving cell which is currently resided.

Thus, by this embodiment, it is possible to provide an explicit condition for starting measurement of signals of other cells, so that measurement of target signals of other cells is started only in case of poor signal quality of the currently camping cell, avoiding unnecessary measurement.

Namely, when the first neighboring cell and the first serving cell and the associated target second serving cell have the same priority, for example, when the neighboring associated radio frequency cell and the self-associated radio frequency cell and the associated visible light cell have the same priority, after the target signal measurement of other cells is started, the RSRP value of the self-cell, for example, the currently-resident target second serving cell and the RSRP value of each cell in the other cells, can be calculated according to the target signal measurement results of the first serving cell and the associated target second serving cell, the target signal measurement results of the other cells and the cell reselection criteria, and the RSRP values of the calculated cells can be ranked according to the size, and then the cell with the largest RSRP value is selected as the reselection cell, so as to ensure that the terminal equipment reselects to the cell with the largest RSRP value, that is, the cell with the best signal quality. It should be noted that, the cell with the largest RSRP value may be the own cell, or may be another second serving cell or a neighboring serving cell, and when the determined reselected cell is the own cell, the current cell may remain camping.

In this way, under the condition that the first neighbor cell and the first service cell and the related target second service cell have the same priority, the terminal equipment can be ensured to reselect the most suitable radio frequency cell and visible light cell pair by calculating the RSRP value of each cell and reselecting to the cell with the largest RSRP value.

Further, the step of not starting the measurement of the target signal of the other cells when the RSRP value of the target second serving cell is greater than the first threshold value and the RSRQ value of the target second serving cell is greater than the second threshold value includes:

That is, in the case that the first neighbor cell and the first serving cell and the target second serving cell associated with the first neighbor cell have the same priority, when the RSRP value of the target second serving cell is greater than the first threshold value and the RSRQ value of the target second serving cell is greater than the second threshold value, it may be further determined whether the weighted RSRP value of the first serving cell and the target second serving cell is greater than the third threshold value and whether the weighted RSRQ value of the first serving cell and the target second serving cell is greater than the fourth threshold value, that is, comprehensively determining whether the signal power and quality of the first serving cell and the target second serving cell associated with the first serving cell currently reside are good.

And under the condition that the condition is satisfied, that is, the weighted RSRP value of the first serving cell and the target second serving cell is greater than the third threshold value, and the weighted RSRQ value of the first serving cell and the target second serving cell is greater than the fourth threshold value, it may be determined that the signal power and quality of the first serving cell and the target second serving cell associated with the first serving cell currently residing are good enough, and target signal measurement of other cells may not be started to avoid unnecessary signal measurement.

And under the condition that the condition is not satisfied, that is, the weighted RSRP value of the first serving cell and the target second serving cell is not greater than the third threshold value, and the weighted RSRQ value of the first serving cell and the target second serving cell is not greater than the fourth threshold value, it may be determined that the signal power and quality of the first serving cell and the target second serving cell associated therewith are not good enough, the target signal measurement of other cells may be started, and in view of the fact that the current first neighboring cell and the first serving cell and the target second serving cell associated therewith are of the same priority, the target signal measurement of other second serving cells associated with the first serving cell may be specifically started, and the target signal measurement of the first neighboring cell may be started, so as to determine, according to the measured target signal quality of each cell, the cell with the largest RSRP value is the reselected cell.

In this way, by further introducing the judgment conditions for the weighted signal power and quality of the first serving cell and the target second serving cell associated with the first serving cell, whether to start measurement is determined, so that the terminal can be further ensured to reside in the cell with better signal quality.

Further, in case of initiating target signal measurements for the other second serving cell and the first neighbor cell, the cell reselection criterion comprises a first R criterion comprising:

That is, when the first neighboring cell and the first serving cell and the target second serving cell associated with the first neighboring cell have the same priority, and target signal measurement of the other second serving cells and the first neighboring cell is started, the RSRP value of each cell currently participating in reselection can be calculated according to a first R criterion, so as to ensure that the cell with the best RSRP value is reselected.

Wherein, the first R criterion may be an improved R criterion, which may specifically include:

by the formula R _s1 ＝αQ _{meas_s} +βQ _{meas_v_s} +Q _Hyst +Q _{Hyst_v} –Q _offsettemp –Q _{offsettemp_v} Calculating the RSRP value of the first service cell and the associated target second service cell;

by the formula R _s2 ＝αQ _{meas_s} +βQ _{meas_v_s} +Q _Hyst –Q _{offset_v} –Q _offsettemp –Q _{offsettemp_v} Calculating RSRP values of the first serving cell and other associated second serving cells;

by the formula R _n ＝αQ _{meas_n} +βQ _{meas_v_n} –Q _offset –Q _{offset_v} –Q _offsettemp –Q _{offsettemp_v} And calculating the RSRP value of the first adjacent service cell and the second adjacent service cell related to the first adjacent service cell.

Then, the calculated RSRP values of the cells are ordered, and the cell with the largest RSRP value is selected as a reselection cell.

Wherein α and β are weights of the two associated serving cells, Q _{meas_s} For the RSRP value, Q, of the first serving cell _{meas_v_s} For the RSRP value, Q of the target second serving cell _{meas_n} For the RSRP value, Q, of the first neighbor serving cell _{meas_v_n} For the RSRP value, Q, of the second neighbor serving cell associated with the first neighbor serving cell _Hyst For the reselection hysteresis value, Q, of the first serving cell _{Hyst_v} Reselection hysteresis, Q, for the target second serving cell _offsettemp And Q _{offsettemp_v} Respectively of the associated two serving cellsTimeout penalty factor, Q _offset For the offset between the first serving cell and the first neighbor serving cell, Q _{offset_v} Is an offset between the target second serving cell and the second neighbor serving cell. The calculated parameters in these first R criteria may also be configured in the cell reselection parameters of the first information.

In this way, by the improved first R criterion, an explicitly feasible and effective cell reselection criterion can be provided for the same priority situation, so as to ensure that the terminal equipment reselects to a suitable cell.

That is, in case that the first neighboring cell and the first serving cell and the target second serving cell associated with the first neighboring cell are in the same priority, when the RSRP value of the target second serving cell is smaller than or equal to the first threshold value, or the RSRQ value of the target second serving cell is smaller than or equal to the second threshold value, it indicates that the signal quality of the current target second serving cell is poor, so that the target signal measurement of other second serving cells associated with the first serving cell can be started first.

And then calculating the RSRP values of the target second serving cell and the other second serving cells according to the target signal measurement result of the first serving cell and the target second serving cell related to the first serving cell, the target signal measurement result of the other second serving cells and a second R criterion, wherein the second R criterion can be a criterion for guiding how to calculate the RSRP values of the target second serving cell and the other second serving cells.

Then, determining a cell with the largest RSRP value in the target second serving cell and the other second serving cell values as a cell to be selected, namely the cell to be selected is the second serving cell with the largest RSRP value; and further judging whether the weighted RSRP value of the first serving cell and the cell to be selected is larger than a third threshold value, namely comprehensively judging whether the signal quality of the first serving cell and the signal quality of the cell to be selected are good.

If yes, the signal quality of the cell to be selected is good enough, so that the second service cell with the maximum RSRP value can be reselected. Otherwise, that is, in the case that the weighted RSRP value of the first serving cell and the candidate cell is not greater than the third threshold value, the target signal measurement of the first neighbor cell, that is, the first neighbor serving cell and the second neighbor serving cell associated with the first neighbor serving cell, may be started.

And may calculate the second serving cell with the largest RSRP value of the first serving cell and the second serving cell with the largest RSRP value of the first neighboring serving cell, and the first neighboring serving cell and the second serving cell with the largest RSRP value of the second neighboring serving cell according to the target signal measurement result of the first serving cell and the second serving cell with the largest RSRP value, and a third R criterion, where the third R criterion may be a criterion for guiding how to calculate the RSRP values of the first serving cell and the second serving cell with the largest RSRP value of the first neighboring serving cell and the second neighboring serving cell with the first neighboring serving cell.

And finally, selecting a cell with the largest RSRP value from the first serving cell and the associated cell to be selected and the first neighbor serving cell and the associated second neighbor serving cell to be reselected.

In this way, by this embodiment, it is possible to provide an explicit feasible scheme for how to measure a cell and how to reselect a cell, and ensure that the terminal device reselects to a suitable cell, in the case that the RSRP value of the target second serving cell currently camping is greater than the first threshold value and the condition that the RSRQ value of the target second serving cell is greater than the second threshold value is not satisfied.

Optionally, the second R criterion includes:

the RSRP value Rs 1_v=Qmeas_v_s+QHyst_v-Qoffset_emp_v of the first serving cell and the associated target second serving cell;

the RSRP value Rs 2_v=Qmeas_v_s-Qoffset_v-Qoffset_displacement_v of the first serving cell and other associated second serving cells;

wherein qmeas_v_s is the RSRP value of the target second serving cell, qhyst_v is the reselection hysteresis value of the target second serving cell, qoffset_v is the timeout penalty factor of the associated second serving cell, and qoffset_v is the offset between the target second serving cell and the other second serving cells.

That is, when the first neighbor cell and the first serving cell and the associated target second serving cell have the same priority, and the target signal measurement of the other second serving cells is started, the RSRP value of each cell currently participating in reselection can be calculated according to the second R criterion, so as to ensure reselection to a suitable cell.

Wherein, the second R criterion may specifically include:

by the formula R _{s1_v} ＝Q _{meas_v_s} +Q _{Hyst_v} –Q _{offsettemp_v} Calculating the RSRP value of the first serving cell and the associated target second serving cell;

by the formula R _{s2_v} ＝Q _{meas_v_s} –Q _{offset_v} –Q _{offsettemp_v} Calculating RSRP values of the first serving cell and other associated second serving cells;

and then, sorting the calculated RSRP values of the cells, selecting the cell with the largest RSRP value as a cell to be selected, and carrying out subsequent judgment.

Wherein Q is _{meas_v_s} For the RSRP value, Q of the target second serving cell _{Hyst_v} Serving the target second small serviceReselection hysteresis value, Q of region _{offsettemp_v} To correlate the timeout penalty factor of the second serving cell, Q _{offset_v} Is an offset between the target second serving cell and the other second serving cells. The calculated parameters in these second R criteria may be configured in the cell reselection parameters of the first information.

Therefore, through the second R criterion, an explicit feasible and effective cell reselection criterion can be provided for the condition that the first neighbor cell and the first service cell have the same priority, and the terminal equipment is ensured to reselect to a proper cell.

Optionally, the third R criterion includes:

the RSRP value of the first serving cell and the associated candidate cell Rs3 = αqmeas_s+βqmeas_v_s+qhyst+qhyst_v-qoffsettmemp-qoffsettmemp_v;

the RSRP value Rn=alpha Qmeas_n+beta Qmeas_v_n-Qoffset-Qoffset_v-Qoffset_ttemp-Qoffset_v of the first adjacent service cell and the second adjacent service cell;

Wherein α and β are weights of the two associated serving cells, qmeas_s is an RSRP value of the first serving cell, qmeas_v_s is an RSRP value of the target second serving cell, qmeas_n is an RSRP value of the first neighboring serving cell, qmeas_v_n is an RSRP value of the second neighboring serving cell associated with the first neighboring serving cell, QHyst is a reselection hysteresis value of the first serving cell, qhyst_v is a reselection hysteresis value of the target second serving cell, qoffset_p and qoffset_v are timeout factors of the two associated penalty serving cells, respectively, qoffset_v is an offset between the first serving cell and the first neighboring serving cell, and qoffset_v is an offset between the target second serving cell and the other second serving cells.

That is, when the first neighbor cell and the first serving cell and the associated target second serving cell have the same priority, and the target signal measurement of the first neighbor cell is started, the RSRP value of each cell currently participating in reselection can be calculated according to the third R criterion, so as to ensure reselection to a proper cell.

Wherein, the third R criterion may specifically include:

By the formula R _s3 ＝αQ _{meas_s} +βQ _{meas_v_s} +Q _Hyst +Q _{Hyst_v} –Q _offsettemp –Q _{offsettemp_v} Calculating the RSRP value of the first service cell and the associated cell to be selected;

by the formula R _n ＝αQ _{meas_n} +βQ _{meas_v_n} –Q _offset –Q _{offset_v} –Q _offsettemp –Q _{offsettemp_v} Calculating the RSRP value of the first adjacent service cell and the associated second adjacent service cell;

Wherein α and β are weights of the two associated serving cells, Q _{meas_s} For the RSRP value, Q, of the first serving cell _{meas_v_s} For the RSRP value, Q of the target second serving cell _{meas_n} For the RSRP value, Q, of the first neighbor serving cell _{meas_v_n} For the RSRP value, Q, of the second neighbor serving cell associated with the first neighbor serving cell _Hyst For the reselection hysteresis value, Q, of the first serving cell _{Hyst_v} Reselection hysteresis, Q, for the target second serving cell _offsettemp And Q _{offsettemp_v} Timeout penalty factors, Q, respectively for associated two serving cells _offset For the offset between the first serving cell and the first neighbor serving cell, Q _{offset_v} Is an offset between the target second serving cell and the second neighbor serving cell. The calculated parameters in these third R criteria may be configured in the cell reselection parameters of the first information.

In this way, through the third R criterion, an explicit feasible and effective cell reselection criterion can be provided for the situation that the first neighbor cell and the first serving cell have the same priority, so as to ensure that the terminal equipment reselects to a proper cell.

To make the above-mentioned implementation of the case where the first neighboring cell and the first serving cell are prioritized more clear, the following description will be given with reference to an example where a radio frequency cell (co-frequency or inter-frequency) is associated with a same priority:

when cell reselection is performed, it is determined whether srxlev_v (RSRP value of the currently camping visible light cell) is greater than a first threshold value, and whether square_v (RSRQ value of the currently camping visible light cell) is greater than a second threshold value:

a) Srxlev_v is larger than a first threshold value and square_v is larger than a second threshold value, and when the conditions are met, the measurement of other visible light cells associated with the radio frequency cell (the radio frequency cell where the radio frequency cell currently resides) can not be started;

i. the measurement may not be started when αsrxlev+βsrxlev_v is greater than the third threshold value and αsquare+βsquare_v is greater than the fourth threshold value, satisfying the condition; the alpha and the beta respectively represent the weights of radio frequency and visible light, namely the proportion of uplink service and downlink service in the heterogeneous networking system;

otherwise, starting the measurement of other visible light cells associated with the associated radio frequency cell and the measurement of adjacent associated radio frequency cells and the associated visible light cells, and sequencing by an improved R criterion (first R criterion):

R _s1 ＝αQ _{meas_s} +βQ _{meas_v_s} +Q _Hyst +Q _{Hyst_v} –Q _offsettemp –Q _{offsettemp_v} the RSRP values of the associated radio frequency cell and the associated visible light cell;

R _s2 ＝αQ _{meas_s} +βQ _{meas_v_s} +Q _Hyst –Q _{offset_v} –Q _offsettemp –Q _{offsettemp_v} The RSRP value of the associated radio frequency cell and other visible light cells associated therewith;

R _n ＝αQ _{meas_n} +βQ _{meas_v_n} –Q _offset –Q _{offset_v} –Q _offsettemp –Q _{offsettemp_v} the RSRP values of the neighboring associated radio frequency cells and their associated visible light cells.

b) Srxlev_v is larger than a first threshold value and square_v is larger than a second threshold value, when the conditions are not met, the measurement of other visible light cells associated with the radio frequency cell is started, the R criterion (second R criterion) ordering is carried out, and the visible light cell with the largest RSRP value is selected:

R _{s1_v} ＝Q _{meas_v_s} +Q _{Hyst_v} –Q _{offsettemp_v} the RSRP values of the associated radio frequency cell and the associated visible light cell;

R _{s2_v} ＝Q _{meas_v_s} –Q _{offset_v} –Q _{offsettemp_v} the RSRP value of the associated radio frequency cell and other visible light cells associated therewith;

i. the alpha Srxlev+beta Rs_v is larger than a third threshold value, and when the condition is met, a visible light cell with the maximum R value is reselected; the Rs_v refers to the RSRP value of the visible light cell with the largest R value;

otherwise, starting measurement of adjacent associated radio frequency cells and associated visible light cells, and sorting by improved R criterion (third R criterion):

R _s3 ＝αQ _{meas_s} +βQ _{meas_v_s} +Q _Hyst +Q _{Hyst_v} –Q _offsettemp –Q _{offsettemp_v} the RSRP values of the associated radio frequency cell and the visible light cell with the highest R value are the same as those of the associated visible light cell;

That is, when the priority of the first neighboring cell is lower than the first serving cell and its associated target second serving cell, or the priority of the cell reselection indicates that the priority of the second neighboring cell is lower than the first serving cell and its associated target second serving cell, for example, the priority of the neighboring associated radio frequency cell is lower than the current associated radio frequency cell and its associated visible light cell, or the priority of the neighboring ordinary radio frequency cell is lower than the current associated radio frequency cell and its associated visible light cell, after the target signal measurement of other cells is started, the RSRP value of the current cell, for example, the current resident target second serving cell and the RSRP value of each cell in the other cells may be calculated according to the target signal measurement result of the first serving cell and its associated target second serving cell, the target signal measurement result of the other cells, and the cell reselection criterion.

The calculated RSRP values of all the cells can be ordered according to the sizes, then the cell with the largest RSRP value is selected, whether the signal quality of the cell with the largest RSRP value meets the requirement is judged, if so, whether the weighted RSRP values of the first service cell which is currently resided and the cell with the largest RSRP value are larger than a certain threshold value is further judged, if so, the cell with the largest RSRP value can be reselected; otherwise, it can further judge whether the signal quality of the cell with the largest RSRP value is poor, and whether the signal quality of other neighboring cells is good enough, specifically, it can accurately judge by combining the RSRP values of the cells, if so, it can reselect to other neighboring cells, otherwise, it can reselect the cell with the largest RSRP value.

In this way, when the priority of the first neighboring cell or the second neighboring cell is lower than that of the first serving cell and the target second serving cell associated with the first neighboring cell, the terminal equipment can be ensured to reselect to the most suitable radio frequency cell and visible light cell pair or to a suitable common radio frequency cell by calculating the RSRP value of each cell and reselecting to the cell with good signal quality.

That is, when the priority of the first neighbor cell is lower than the first serving cell and the target second serving cell associated with the first neighbor cell, or the priority of the cell reselection indicates that the priority of the second neighbor cell is lower than the first serving cell and the target second serving cell associated with the first neighbor cell, and the RSRQ value of the target second serving cell is greater than the first threshold value and the condition that the RSRQ value of the target second serving cell is greater than the second threshold value is met, it may be further determined whether the weighted RSRP value of the first serving cell and the target second serving cell is greater than a third threshold value and whether the weighted RSRQ value of the first serving cell and the target second serving cell is greater than a fourth threshold value, that is, whether the signal power and the quality of the currently-resident first serving cell and the target second serving cell associated with the first serving cell are good or not is comprehensively determined.

And in case that the conditions are not satisfied, that is, the weighted RSRP values of the first serving cell and the target second serving cell are not greater than the third threshold value, and the weighted RSRQ values of the first serving cell and the target second serving cell are not greater than the fourth threshold value, it may be determined that the signal power and quality of the first serving cell and the target second serving cell associated therewith are not good enough, the target signal measurement of other cells may be started, and in view of the fact that the priority of the first neighbor cell is lower than the first serving cell and the target second serving cell associated therewith, only the target signal measurement of other second serving cells associated with the first serving cell may be started, so as to determine a suitable reselection cell according to the measured target signal quality of each cell.

In addition, in the case that the RSRP value of the target second serving cell is less than or equal to the first threshold value, or the RSRQ value of the target second serving cell is less than or equal to the second threshold value, it indicates that the signal quality of the target second serving cell is currently poor, and the target signal measurement of other cells may be started, and in view of the fact that the priority of the first neighbor cell is lower than that of the first serving cell and its associated target second serving cell, only the target signal measurement of the other second serving cells may be started, so as to determine a suitable reselection cell according to the measured target signal quality of each cell.

Further, the cell reselection priority indicates that the priority of the first neighbor cell is lower than that of the first serving cell and a target second serving cell associated with the first serving cell, and the cell reselection criteria include a second R criterion;

I.e. in case the first neighbor cell has a lower priority than the first serving cell and its associated target second serving cell and the target signal measurement of the other second serving cell is initiated, the RSRP values of the target second serving cell and the other second serving cell may be calculated based on the target signal measurement result of the target second serving cell, the target signal measurement result of the other second serving cell and the second R criterion, i.e. the RSRP values of the respective second serving cells associated with the first serving cell are calculated and the RSRP values of the target second serving cell and the other second serving cell may be ordered, wherein the second R criterion may be a criterion for guiding how to calculate the RSRP values of the target second serving cell and the other second serving cell.

And judging whether the weighted RSRP value of the first service cell and the second service cell with the largest RSRP value is smaller than a seventh threshold value, and the weighted RSRP value of the target cell, namely, whether the weighted RSRP value of any second adjacent service cell associated with the first adjacent service cell is larger than an eighth threshold value, namely, comprehensively judging whether the signal quality of the second service cell with the largest current RSRP value is not good enough, and whether a second adjacent service cell with good signal quality exists in the first adjacent cell.

If the weighted RSRP value of the first serving cell and the second serving cell with the largest RSRP value is smaller than the seventh threshold value, and the weighted RSRP value of the first neighboring serving cell and the target second neighboring serving cell is measured to be larger than the eighth threshold value, the duration of the situation exceeds a preset first duration, and the residence duration of the terminal equipment in the first serving cell and the target second serving cell exceeds a preset second duration, the terminal equipment can reselect to the first neighboring serving cell and the target second neighboring serving cell related to the first neighboring serving cell. Otherwise, the second serving cell with the largest RSRP value may be reselected.

In this way, by the embodiment, the first neighboring cell can be low in priority, and an explicit feasible scheme is provided for reselecting the cell when the measurement of the target signal of other second serving cells is started, so that the terminal equipment is ensured to reselect to a proper cell.

I.e. in case the second neighbor cell has a lower priority than the first serving cell and its associated target second serving cell and the target signal measurement of the other second serving cell is initiated, the RSRP values of the target second serving cell and the other second serving cell may be calculated based on the target signal measurement result of the target second serving cell, the target signal measurement result of the other second serving cell and the second R criterion, i.e. the RSRP values of the respective second serving cells associated with the first serving cell are calculated and the RSRP values of the target second serving cell and the other second serving cell may be ordered, wherein the second R criterion may be a criterion for guiding how to calculate the RSRP values of the target second serving cell and the other second serving cell.

If yes, the signal quality of the cell to be selected is good enough, so that the second service cell with the maximum RSRP value can be reselected. Otherwise, that is, in the case that the weighted RSRP value of the first serving cell and the candidate cell is not greater than the third threshold value, the target signal measurement of the second neighboring cell, that is, the third neighboring serving cell, may be started.

And judging whether the weighted RSRP value of the first service cell and the second service cell with the largest RSRP value is smaller than a ninth threshold value, and whether the weighted RSRP value of the target cell, namely, the weighted RSRP value of any third neighbor service cell, is larger than a tenth threshold value, namely, comprehensively judging whether the signal quality of the second service cell with the largest current RSRP value is not good enough, and whether a third neighbor service cell with good signal quality exists.

If the weighted RSRP value of the first serving cell and the second serving cell with the largest RSRP value is smaller than the ninth threshold value, and the RSRP value of the target third neighboring serving cell is measured to be larger than the tenth threshold value, the duration of the situation exceeds a preset first duration, and the residence duration of the terminal equipment in the first serving cell and the target second serving cell exceeds a preset second duration, the terminal equipment can reselect to the target third neighboring serving cell. Otherwise, the second serving cell with the largest RSRP value may be reselected.

In this way, by means of the embodiment, it is possible to provide an explicit feasible scheme for reselecting the cell in the case that the second neighboring cell is low in priority and the target signal measurement for other second serving cells has been started, so as to ensure that the terminal device reselects to a suitable cell.

Optionally, the second R criterion includes:

That is, when the first neighboring cell and the second neighboring cell have a priority lower than that of the first serving cell and the target second serving cell associated with the first neighboring cell, and the target signal measurement of the other second serving cells is started, the RSRP value of each cell currently participating in reselection can be calculated according to a second R criterion, so as to ensure reselection to a proper cell.

Wherein, the second R criterion may specifically include:

Wherein Q is _{meas_v_s} For the RSRP value, Q of the target second serving cell _{Hyst_v} Reselection hysteresis, Q, for the target second serving cell _{offsettemp_v} To correlate the timeout penalty factor of the second serving cell, Q _{offset_v} Is an offset between the target second serving cell and the other second serving cells. The calculated parameters in these second R criteria may be configured in the cell reselection parameters of the first information.

Therefore, through the second R criterion, an explicit and feasible and effective cell reselection criterion can be provided for the conditions of low priority of the first neighbor cell or low priority of the second neighbor cell and the like, and the terminal equipment is ensured to reselect to a proper cell.

To make the above-mentioned embodiment of the case that the priority of the first neighboring cell is lower than that of the first serving cell clearer, the following description will be made with reference to an example of a low-priority associated radio frequency cell (co-frequency or inter-frequency):

a) Srxlev_v is larger than a first threshold value and square_v is larger than a second threshold value, and when the conditions are met, the measurement of other visible light cells associated with the radio frequency cell can not be started;

i. the measurement may not be started when αsrxlev+βsrxlev_v is greater than the third threshold value and αsquare+βsquare_v is greater than the fourth threshold value, satisfying the condition;

otherwise, starting the measurement of other visible light cells associated with the associated radio frequency cell, carrying out R criterion sequencing, and selecting a visible light cell Rs_v with the maximum RSRP value:

if the alpha Srxlev+beta Rs_v is larger than a third threshold value, reselecting the cell to a radio frequency cell and a target visible light cell; rs_v is the target visible light cell with the largest RSRP value;

otherwise, starting measurement of adjacent associated radio frequency cells and associated visible light cells, if the serving cell alpha Srxlev+beta Rs_v is smaller than a seventh threshold value, and the target cell alpha Srxlev+beta Srxlev_v is larger than an eighth threshold value, and the duration exceeds a first time length, and the time that the terminal resides in the original associated radio frequency cell and the associated visible light cell exceeds a second time length, reselecting the target associated radio frequency cell and the visible light cell;

b) Srxlev_v is larger than a first threshold value and square_v is larger than a second threshold value, when the conditions are not met, the measurement of other visible light cells associated with the radio frequency cell is started, R criterion ordering is carried out, and the visible light cell Rs_v with the largest R value is selected:

i. if the alpha Srxlev+beta Rs_v is larger than a third threshold value, reselecting the cell to a radio frequency cell and a target visible light cell, wherein the Rs_v refers to the RSRP value of the visible light cell with the largest R value;

and if the service cell alpha Srxlev+beta Rs_v is smaller than a seventh threshold value, the target cell alpha Srxlev+beta Srxlev_v is larger than an eighth threshold value, the duration exceeds a first time length, the time that the terminal resides in the original associated radio frequency cell and the associated visible light cell exceeds a second time length, and the cell reselects to the target associated radio frequency cell and the visible light cell.

In order to make the above-mentioned implementation of the case that the second neighboring cell has a lower priority than the first serving cell clearer, the following description will be made with reference to an example of a low-priority normal radio frequency cell (co-frequency or inter-frequency):

otherwise, starting measurement of adjacent common radio frequency cells and associated visible light cells, if the serving cell alpha Srxlev+beta Rs_v is smaller than a ninth threshold value, and the target cell Srxlev is larger than a tenth threshold value, and the duration exceeds a first time length, and if the time of the terminal residing in the original associated radio frequency cell and the associated visible light cell exceeds a second time length, reselecting the target common radio frequency cell, and only performing radio frequency access;

and if the service cell alpha Srxlev+beta Rs_v is smaller than a ninth threshold value, the target cell Srxlev is larger than a tenth threshold value, the duration exceeds a first time length, and the time that the terminal resides in the original associated radio frequency cell and the associated visible light cell exceeds a second time length, the cell reselects to the target ordinary radio frequency cell.

That is, in case that the first neighbor cell has a higher priority than the first serving cell and its associated target second serving cell, the target signal measurement of the first neighbor cell, i.e. the first neighbor serving cell and its associated second neighbor serving cell, may be directly started.

And when it is measured that a target second neighbor serving cell exists, so that the weighted RSRP value of the first neighbor serving cell and the target second neighbor serving cell is greater than a fifth threshold value, or the weighted RSRQ value of the first neighbor serving cell and the target second neighbor serving cell is greater than a sixth threshold value, where the situation continues for a predetermined first duration, the terminal device may reselect the first neighbor serving cell and the target second neighbor serving cell associated with the first neighbor serving cell when the residence time of the first serving cell and the target second serving cell is longer than a second duration.

For example, for the case of a high priority associated radio frequency cell (co-frequency or inter-frequency), measurement of the neighboring associated radio frequency cell and its associated visible light cell may be initiated, if αsrxlev+βsrxlev_v of the target cell is greater than a fifth threshold or αsquare+βsquare_v is greater than a sixth threshold and the duration exceeds a first time length, and the time for the terminal to reside in the original associated radio frequency cell and its associated visible light cell exceeds a second time length, the cell reselects to the neighboring associated radio frequency cell and its associated visible light cell.

Thus, by this embodiment, a feasible and efficient way is provided for how to perform cell reselection in case of high priority, enabling the terminal to quickly reselect to the appropriate cell.

It should be noted that, the system information, that is, the cell reselection related parameter in the first information may include the above-mentioned cell reselection priority, a related threshold value, an R criterion related parameter, etc., and considering that the priority of the common radio frequency cell is lower than the priority of the associated radio frequency cell, the ninth threshold value of the configurable common radio frequency cell is smaller than the seventh threshold value of the associated radio frequency cell, and the tenth threshold value of the common radio frequency cell is larger than the eighth threshold value of the associated radio frequency cell, that is, only when the quality of the associated radio frequency cell and the visible light cell thereof is poor and intolerable, and the quality of the common radio frequency cell is good, the reselection to the common radio frequency cell is considered, and the access of the visible light is abandoned.

The following is an illustration of a specific implementation of an embodiment of the present application in connection with several embodiments shown in fig. 6-9:

example 1:

referring to fig. 6, assuming that the associated radio frequency cell RF1 is associated with 4 visible light cells and the associated radio frequency cell RF2 is also associated with 4 visible light cells, the terminal cell selection temporarily resides to RF1-VLC0, then the cell reselection procedure is as follows:

In case RF2 has the same priority as RF1, the cell reselection flow chart may be as shown in fig. 7 a.

In case RF2 has a higher priority than RF1, the cell reselection flow chart may be as shown in fig. 7 b.

In case RF2 has a lower priority than RF1, the cell reselection flow chart may be as shown in fig. 7 c.

Example 2:

referring to fig. 8, assuming that the associated radio frequency cell RF1 is associated with 4 visible light cells and RF2 is a normal radio frequency cell not associated with a visible light cell, the terminal cell selects to temporarily camp on RF1-VLC0, then the cell reselection procedure is as follows:

RF2 has a lower priority than RF1 and the cell reselection flow chart may be as shown in fig. 9.

The embodiment of the application provides a cell selection and reselection method for a visible light heterogeneous network, which can be used for simultaneously residing in a most suitable radio frequency cell and a visible light cell and assisting in realizing a subsequent random access flow, so that the time delay of a terminal accessing to a visible light base station is reduced, and the access flow rate is improved.

In the cell selection and reselection method in the embodiment of the present application, a terminal device receives first information sent by a first serving cell, where the first information includes: second information indicating whether the first serving cell allows camping; third information indicating whether the first serving cell allows access of a second serving cell; fourth information indicating an association relationship between the first serving cell and the second serving cell; fifth information, the fifth information indicating cell selection and reselection parameters corresponding to the first serving cell and/or cell selection and reselection parameters corresponding to the second serving cell; cell selection or cell reselection is performed based on the first information and a target signal measurement of the first serving cell and/or the second serving cell. In this way, the terminal directly selects the cell to access or reselect the cell based on the first information sent by the service cell, so that the measurement reporting of the terminal and the reconfiguration process of the network equipment are omitted, the access time delay can be reduced, and the access process rate is improved.

Referring to fig. 5, fig. 5 is a flowchart of another cell selection and reselection method provided in an embodiment of the present application, which is performed by a network device, as shown in fig. 5, and includes the steps of:

step 501, sending first information to a terminal device, so that the terminal device performs cell selection or cell reselection according to the first information and a target signal measurement result of a first serving cell and/or a second serving cell;

wherein the first information includes:

second information indicating whether the first serving cell allows camping;

It should be noted that, as an implementation manner of the network device side corresponding to the embodiment shown in fig. 4, a specific implementation manner of the embodiment may refer to the related description in the foregoing embodiment, and in order to avoid repetition, a description is omitted here.

The cell selection and reselection method of the embodiment of the application sends first information to the terminal equipment so that the terminal equipment executes cell selection or cell reselection according to the first information and the target signal measurement result of the first service cell and/or the second service cell; wherein the first information includes: second information indicating whether the first serving cell allows camping; third information indicating whether the first serving cell allows access of a second serving cell; fourth information indicating an association relationship between the first serving cell and the second serving cell; and fifth information, wherein the fifth information indicates cell selection and reselection parameters corresponding to the first serving cell and/or cell selection and reselection parameters corresponding to the second serving cell. Therefore, the terminal equipment can directly select the cell for accessing or reselecting the cell based on the first information sent by the service cell, so that the measurement reporting of the terminal equipment and the reconfiguration process of the network equipment are omitted, the access time delay can be reduced, and the access process rate can be improved.

The embodiment of the application also provides a cell selection and reselection device which is arranged at the terminal equipment. Referring to fig. 10, fig. 10 is a block diagram of a cell selection and reselection apparatus provided in an embodiment of the present application. Since the principle of the cell selection and reselection device for solving the problem is similar to that of the cell selection and reselection method in the embodiment of the present application, the implementation of the cell selection and reselection device may refer to the implementation of the method, and the repetition is not repeated.

As shown in fig. 10, the cell selection and reselection apparatus 1000 includes:

the receiving module 1001 is configured to receive first information sent by a first serving cell, where the first information includes:

second information indicating whether the first serving cell allows camping;

an execution module 1002 is configured to perform cell selection or cell reselection based on the first information and a target signal measurement result of the first serving cell and/or the second serving cell.

Optionally, the execution module 1002 includes:

the third determination submodule includes:

Optionally, the processing unit includes:

the determination unit includes:

The determination unit includes:

Optionally, the first processing subunit is configured to:

The processing unit is used for:

Wherein α and β are weights of the two associated serving cells, Q _{meas_s} For the RSRP value, Q, of the first serving cell _{meas_v_s} For the RSRP value, Q of the target second serving cell _{meas_n} For the RSRP value, Q, of the first neighbor serving cell _{meas_v_n} For the RSRP value, Q, of the second neighbor serving cell associated with the first neighbor serving cell _Hyst For the reselection hysteresis value, Q, of the first serving cell _{Hyst_v} Serving the target second small service Reselection hysteresis value, Q of region _offsettemp And Q _{offsettemp_v} Timeout penalty factors, Q, respectively for associated two serving cells _offset For the offset between the first serving cell and the first neighbor serving cell, Q _{offset_v} Is an offset between the target second serving cell and the second neighbor serving cell.

Optionally, the second processing subunit is configured to:

the second determining subunit is configured to:

Optionally, the first processing subunit is configured to:

The processing unit further includes:

the second processing subunit is configured to:

the second computing subunit is configured to:

the third determining subunit is configured to:

the second computing subunit is configured to:

the third determining subunit is configured to:

Optionally, the third determining submodule is configured to:

Optionally, the second R criterion includes:

Optionally, the third R criterion includes:

Wherein α and β are weights of the two associated serving cells, Q _{meas_s} Is saidRSRP value, Q of first service cell _{meas_v_s} For the RSRP value, Q of the target second serving cell _{meas_n} For the RSRP value, Q, of the first neighbor serving cell _{meas_v_n} For the RSRP value, Q, of the second neighbor serving cell associated with the first neighbor serving cell _Hyst For the reselection hysteresis value, Q, of the first serving cell _{Hyst_v} Reselection hysteresis, Q, for the target second serving cell _offsettemp And Q _{offsettemp_v} Timeout penalty factors, Q, respectively for associated two serving cells _offset For the offset between the first serving cell and the first neighbor serving cell, Q _{offset_v} Is an offset between the target second serving cell and the other second serving cells.

The cell selection and reselection apparatus 1000 provided in the embodiments of the present application may perform the above method embodiments, and its implementation principle and technical effects are similar, and this embodiment is not repeated here.

The cell selection and reselection apparatus 1000 in the embodiment of the present application receives first information sent by a first serving cell, where the first information includes: second information indicating whether the first serving cell allows camping; third information indicating whether the first serving cell allows access of a second serving cell; fourth information indicating an association relationship between the first serving cell and the second serving cell; fifth information, the fifth information indicating cell selection and reselection parameters corresponding to the first serving cell and/or cell selection and reselection parameters corresponding to the second serving cell; cell selection or cell reselection is performed based on the first information and a target signal measurement of the first serving cell and/or the second serving cell. In this way, the terminal equipment directly selects the cell to access or reselect the cell based on the first information sent by the service cell, so that the measurement report of the terminal equipment and the reconfiguration process of the network equipment are omitted, the access time delay can be reduced, and the access process rate can be improved.

The embodiment of the application also provides another cell selection and reselection device which is arranged in the network equipment. Referring to fig. 11, fig. 11 is a block diagram of a cell selection and reselection apparatus provided in an embodiment of the present application. Since the principle of the cell selection and reselection device for solving the problem is similar to that of the cell selection and reselection method in the embodiment of the present application, the implementation of the cell selection and reselection device may refer to the implementation of the method, and the repetition is not repeated.

As shown in fig. 11, the cell selection and reselection apparatus 1100 includes:

a sending module 1101, configured to send first information to a terminal device, so that the terminal device performs cell selection or cell reselection according to the first information and a target signal measurement result of a first serving cell and/or a second serving cell;

wherein the first information includes:

second information indicating whether the first serving cell allows camping;

The cell selection and reselection apparatus 1100 provided in the embodiments of the present application may perform the above method embodiments, and its implementation principle and technical effects are similar, and this embodiment is not repeated here.

The cell selection and reselection apparatus 1100 in the embodiment of the present application sends first information to a terminal device, so that the terminal device performs cell selection or cell reselection according to the first information and a target signal measurement result of a first serving cell and/or a second serving cell; wherein the first information includes: second information indicating whether the first serving cell allows camping; third information indicating whether the first serving cell allows access of a second serving cell; fourth information indicating an association relationship between the first serving cell and the second serving cell; and fifth information, wherein the fifth information indicates cell selection and reselection parameters corresponding to the first serving cell and/or cell selection and reselection parameters corresponding to the second serving cell. Therefore, the terminal equipment can directly select the cell for accessing or reselecting the cell based on the first information sent by the service cell, so that the measurement reporting of the terminal equipment and the reconfiguration process of the network equipment are omitted, the access time delay can be reduced, and the access process rate can be improved.

The embodiment of the application also provides communication equipment. Since the principle of the communication device for solving the problem is similar to that of the cell selection and reselection method in the embodiment of the present application, the implementation of the communication device may refer to the implementation of the method, and the repetition is omitted. As shown in fig. 12, a communication device of an embodiment of the present application includes:

in one embodiment, the processor 1200 is a terminal device, and the processor 1200 is configured to read the program in the memory 1220, and perform the following procedure:

first information transmitted by a first serving cell is received by transceiver 1210, the first information comprising:

second information indicating whether the first serving cell allows camping;

A transceiver 1210 for receiving and transmitting data under the control of the processor 1200.

Wherein in fig. 12, a bus architecture may comprise any number of interconnected buses and bridges, and in particular, one or more processors represented by processor 1200 and various circuits of memory represented by memory 1220, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 1210 may be a number of elements, i.e. include a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 1200 is responsible for managing the bus architecture and general processing, and the memory 1220 may store data used by the processor 1200 in performing operations.

Optionally, the processor 1200 is further configured to read from the memory 1220, and perform the following steps:

processor 1200 is also configured to read from memory 1220, performing the steps of:

The first serving cell and its associated target second serving cellRSRP value R of (2) _s1 ＝αQ _{meas_s} +βQ _{meas_v_s} +Q _Hyst +Q _{Hyst_v} –Q _offsettemp –Q _{offsettemp_v} ；

Optionally, the second R criterion includes:

Wherein Q is _{meas_v_s} For the RSRP value, Q of the target second serving cell _{Hyst_v} Reselection hysteresis, Q, for the target second serving cell _{offsettemp_v} Punishment of timeout for associated second serving cellPenalty factor, Q _{offset_v} Is an offset between the target second serving cell and the other second serving cells.

Optionally, the third R criterion includes:

Wherein α and β are weights of the two associated serving cells, Q _{meas_s} For the RSRP value, Q, of the first serving cell _{meas_v_s} For the RSRP value, Q of the target second serving cell _{meas_n} For the RSRP value, Q, of the first neighbor serving cell _{meas_v_n} For the RSRP value, Q, of the second neighbor serving cell associated with the first neighbor serving cell _Hyst For the reselection hysteresis value, Q, of the first serving cell _{Hyst_v} Reselection hysteresis, Q, for the target second serving cell _offsettemp And Q _{offsettemp_v} Timeout penalty factors, Q, respectively for associated two serving cells _offset For the offset between the first serving cell and the first neighbor serving cell, Q _{offset_v} Is an offset between the target second serving cell and the other second serving cells.

In another embodiment, the communication device is a network device, and the processor 1200 is configured to read the program in the memory 1220, and perform the following procedure:

Transmitting first information to a terminal device through a transceiver 1210, so that the terminal device performs cell selection or cell reselection according to the first information and a target signal measurement result of a first serving cell and/or a second serving cell;

wherein the first information includes:

second information indicating whether the first serving cell allows camping;

The communication device provided in the embodiment of the present application may execute the above method embodiment, and its implementation principle and technical effects are similar, and this embodiment will not be described herein again.

Furthermore, the computer readable storage medium of the embodiments of the present application is configured to store a computer program, where the computer program may be executed by a processor to implement the steps of the foregoing method embodiments shown in fig. 4 or fig. 5.

In the several embodiments provided in this application, it should be understood that the disclosed methods and apparatus may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

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

The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform part of the steps of the transceiving method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

While the foregoing is directed to the preferred embodiments of the present application, it should be noted that modifications and adaptations to those embodiments may occur to one skilled in the art and that such modifications and adaptations are intended to be comprehended within the scope of the present application without departing from the principles set forth herein.

Claims

1. A cell selection and reselection method performed by a terminal device, the method comprising:

second information indicating whether the first serving cell allows camping;

2. The method of claim 1, wherein the first serving cell is a radio frequency cell and the second serving cell is a visible light cell.

3. The method according to claim 1, wherein said performing cell selection based on said first information and target signal measurements of said first serving cell and/or said second serving cell comprises:

4. A method according to any of claims 1-3, characterized in that said performing cell reselection based on said first information and target signal measurements of said first serving cell and/or said second serving cell comprises:

5. The method of claim 4, wherein the cell reselection priority indicates at least one of a priority relationship of a first neighbor cell with the first serving cell and its associated target second serving cell and a priority relationship of a second neighbor cell with the first serving cell and its associated target second serving cell, the first neighbor cell being a first neighbor serving cell and its associated second neighbor serving cell, the second neighbor cell being a third neighbor serving cell;

6. The method of claim 5, wherein said determining whether to initiate target signal measurements for other cells based on the priority relationship indicated by the cell reselection priorities and target signal measurements for the first serving cell and its associated target second serving cell for the cell selection, and if so, measuring target signal quality for the other cells, comprises:

7. The method of claim 6, wherein the cell reselection priority indicates that the first neighbor cell is co-prioritized with the first serving cell and its associated target second serving cell;

8. The method of claim 6, wherein the cell reselection priority indicates that the first neighbor cell has a lower priority than the first serving cell and its associated target second serving cell, or wherein the cell reselection priority indicates that the second neighbor cell has a lower priority than the first serving cell and its associated target second serving cell;

9. The method of claim 7, wherein the not initiating the target signal measurement for the other cell if the RSRP value of the target second serving cell is greater than the first threshold value and the RSRQ value of the target second serving cell is greater than the second threshold value comprises:

10. The method according to claim 9, wherein in case of initiating target signal measurements for the other second serving cell and the first neighbor cell, the cell reselection criterion comprises a first R criterion comprising:

11. The method according to claim 9, wherein the initiating the target signal measurement for the other cell if the RSRP value of the target second serving cell is less than or equal to the first threshold value or the RSRQ value of the target second serving cell is less than or equal to the second threshold value comprises:

12. The method of claim 8, wherein the not initiating the target signal measurement for the other cell if the RSRP value of the target second serving cell is greater than the first threshold value and the RSRQ value of the target second serving cell is greater than the second threshold value comprises:

13. The method of claim 12, wherein the cell reselection priority indicates that the first neighbor cell has a lower priority than the first serving cell and its associated target second serving cell, the cell reselection criteria comprising a second R-criterion;

14. The method of claim 12, wherein the cell reselection priority indicates that the second neighbor cell has a lower priority than the first serving cell and its associated target second serving cell, the cell reselection criteria comprising a second R-criterion;

15. The method of claim 4, wherein the determining a reselection cell based on the cell reselection priority and cell reselection criteria, and target signal measurements of the first serving cell and its associated target second serving cell of the cell selection, comprises:

Starting target signal measurement of a first neighbor cell under the condition that the cell reselection priority indicates that the priority of the first neighbor cell is higher than that of the first service cell and a target second service cell related to the first neighbor cell, wherein the first neighbor cell is the first neighbor service cell and the second neighbor service cell related to the first neighbor cell;

16. The method of claim 11, 13 or 14, wherein the second R criterion comprises:

17. The method of claim 11, wherein the third R criterion comprises:

18. A method of cell selection and reselection performed by a network device, the method comprising:

wherein the first information includes:

second information indicating whether the first serving cell allows camping;

19. The method of claim 18, wherein the first serving cell is a radio frequency cell and the second serving cell is a visible light cell.

20. A cell selection and reselection apparatus, comprising:

second information indicating whether the first serving cell allows camping;

21. A cell selection and reselection apparatus, comprising:

Wherein the first information includes:

second information indicating whether the first serving cell allows camping;

22. A terminal device, comprising: a transceiver and a processor; wherein, the liquid crystal display device comprises a liquid crystal display device,

second information indicating whether the first serving cell allows camping;

23. A network device, comprising: a transceiver and a processor; wherein, the liquid crystal display device comprises a liquid crystal display device,

wherein the first information includes:

second information indicating whether the first serving cell allows camping;

24. A communication device, comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor; -characterized in that the processor is arranged to read a program in a memory for implementing the steps of the cell selection and reselection method according to any of claims 1 to 17; or to implement the steps in a cell selection and reselection method as claimed in claim 18 or 19.

25. A computer readable storage medium storing a computer program, which when executed by a processor performs the steps of the cell selection and reselection method according to any of claims 1 to 17; or to implement the steps in a cell selection and reselection method as claimed in claim 18 or 19.