WO2019214203A1 - Communication method, user equipment, and device with storage function - Google Patents
Communication method, user equipment, and device with storage function Download PDFInfo
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- WO2019214203A1 WO2019214203A1 PCT/CN2018/115647 CN2018115647W WO2019214203A1 WO 2019214203 A1 WO2019214203 A1 WO 2019214203A1 CN 2018115647 W CN2018115647 W CN 2018115647W WO 2019214203 A1 WO2019214203 A1 WO 2019214203A1
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- cell
- cells
- access network
- frequency
- notification area
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/16—Discovering, processing access restriction or access information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/20—Selecting an access point
Definitions
- the present disclosure generally relates to the technical field communications, especially a communication method, a user equipment, and a device with storage function.
- a radio resource control inactive state (RRC_INACTIVE) is introduced.
- RRC_INACTIVE radio resource control inactive state
- CN core network
- RAN radio resource control inactive state
- cell reselection is need to obtain at least one suitable cell to be thereselected cell.
- the reselected cell (s) may serve as a new resident cell for the user equipment.
- reselected cell if the selected cell (s) is outside the radio access network notification area, the user equipment needs to perform RAN-based location update (RLAU) operation, which will result in high signaling overhead and power consumption. In addition, it cannot be determined whetherall cells support the inactive state of the radio resource control. If the selected cell (s) includes a cell that does not support the inactive state of the radio resource control, when the user equipment connects to that cell, it needs to switchto the radio resource control idle stateto complete the cell reselection. This switch also results in high power consumption.
- RLAU RAN-based location update
- the technical problem to be resolved by the present disclosure is to provide a communication method, a user equipment and a device with a storage function, in order to reduce signaling overhead, power consumption, and saving resources.
- the first aspect of the present disclosure provides a communication method.
- the method will find at least one first-best cell in the range of a radio access network notification area.
- the first-best cell satisfiesthe cell selection criteriaand has the highest absolute priority among all the cells thatsatisfythe cell selection criteria in the radio access network notification area; If the first-best cell is found, it will serve as the reselected cell. Otherwise, the method search for thesecond-best cell among all available cells.
- the second-best cells atisfiesthe cell selection criteria, and has the highest absolute priority among all the cells thatsatisfy the cell selection criteria in all available cells. If found, the second-best cellwill serve as the reselected cell.
- thesecond aspect of the present disclosure provides a user equipment.
- the user equipment includes a processor, a communication circuit and a storage unit, which are all connected to each other to implement the method of the first or the second aspect of the present disclosure.
- the third aspect of the present disclosure provides a device with storage function.
- the device stores program data, which can be executed to achieve the above mentioned procedure.
- the present disclosure has the advantages that aredifferent from the case of the prior art.
- the present disclosure first selects at least one suitable cell among cells within the radio access network notification area as the reselected cell. If this step is successful, the RAN-based location update (RLAU) operation performed by cells outside the radio access network notification area can be avoided.
- the cell supporting the inactive state of the radio resource control is selected to be the reselected cell. If the cell is successfully found, the resourcesneeded in the case that the user equipment needs to switch to the idle state of the radio resource control whena cell that does not support the inactive state of the radio resource control is selected.
- the method not only considers the signal quality of the cell, but also the absolute priority of the cell.
- the cells in the RAN notification area generally have the highest absolute priority, followed by the cells supporting the inactive state of the radio resource control, which reduces the signaling overhead and power consumption caused by PLAUand the RRC_IDLE operation performed by the user equipment, thus saving resources.
- FIG. 1 is a flow chart of the first embodiment of a communication method of the present disclosure.
- FIG. 2 is a flow chart of the first embodiment offinding a first-best cell of the present disclosure.
- FIG. 3 is a flowchart of the first embodiment of a method for determining whether a first-best cell can serve as a reselected cell according to the present disclosure.
- FIG. 4 is a schematic flow chart of the second embodiment of a method for searching for a first-best cell according to the present disclosure.
- FIG. 5 is a flow chart of the second embodiment of a communication method of the present disclosure.
- FIG. 6 is a schematic flow chart of an embodiment of a method for finding a second-best cell according to the present disclosure
- FIG. 7 is a schematic flowchart of the first embodiment of a method for determining whether a second-best cell can serve as a reselected cell according to the present disclosure.
- FIG. 8 is a flow chart of the third embodiment of a communication method of the present disclosure.
- FIG. 9 is a schematic diagram of the structure of a user equipment inthe first embodiment of the present disclosure.
- FIG. 10 is a schematic diagram of the structure of the first embodiment ofa device with storage function in the present disclosure.
- FIG. 1 is a flowchart diagram of the first embodiment of a communication method provided by the present disclosure. As shown in FIG. 1, the communication method provided by the present disclosure includes the following steps.
- S101 user equipmentfinds at least one first-best cell in therange of a radio access network notification area, where the first-best cellhas quality satisfyingthe cell selection criteria, and the first-best cellhasthe highest absolute priority among all the cells satisfyingcell selection criteria in the radio access network notification area.
- the user equipment in the inactive state of the radio resource control is configured with an RAN notification area (RNA) range.
- RNA RAN notification area
- RLAU RAN-based location update
- RRC radio resource control
- the RLAU operation needs to be performed.
- each frequency is assigned an absolute priority.
- Theabsolute priorities of different frequencies will be transmitted to the user equipment by one or more methodsinfollowing ways, namely, 1) in system information broadcast by the cell, 2) in the RRCConnectionRelease message sent by a current base station, and 3) by inheriting from a previous radio access technology (RAT) , during RAT cell selection (or reselection) .
- the absolute priority of each frequency may be sent to the user equipment by other methods, for example, by pre-defining the absolute priority of each frequency in the user equipment, and the like.
- a radio access network notification area frequency list includes all frequencies in the range of the radio access network notification area of the user equipment and theirabsolute priorities.
- the current base station connected to the user equipment sends the radio access network notification area frequency list to the user equipment byRRCConnectionReleasemessage.
- FIG. 2 is a schematic flowchart of the first embodiment of a method for finding thefirst-best cell according to the present disclosure.
- the method of finding the first-best cell includes the following steps.
- S1011 user equipmentchecks a radio access network notification area frequency list, and storesthe frequencies in the radio access network notification area frequency list from high to low according to theabsolute priority class to form a candidate frequency set of the access network notification area.
- the user equipment checks the radio access network notification area frequency list sent by the current base station, and obtaining all the frequencies in the range of the radio access network notification area of the user equipment. Based on the pre-receivedabsolute priorities of different frequencies, the user equipment sorts the frequencies from high to low according to theirabsolute priorities and store the sorted frequencies to form a candidate frequency set of the access network notification area.
- all frequencies in the radio access network notification area of the user equipment and the correspondingabsolute priorities are stored in pairs, or stored in pairs and in an order of from high to low or from low to high according to their absolute priority class to form a candidate frequency set of the radio access network notification area.
- S1012 user equipment checksthe candidate frequency set of the radio access network notification area to obtain one or more frequencies with the highest absolute priority.
- the user equipment checks one or more frequencies with the highest absolute priorityin the frequency set of the candidate radio access network notification area. It should be noted that there might be a plurality of different frequencies that have the same absolute priority. The user equipment finds the absolute priority class of the one or more frequencies according to the absolute priority corresponding to the different frequencies that have been received. In other implementation scenarios, since all frequencies in the radio access network notification area of the user equipment and their correspondingabsolute priorities are stored in pairs, therefore when the frequency with the highest absolute priority is found, the absolute priorityclass of the frequency has already been obtained. In other implementation scenarios, in step S1011, the user equipment may record the highest absolute priority in theabsolute priorities, when all the frequencies in the radio access network notification area of the user equipment according to their absolute priority class are sorted from high to low.
- S1013 user equipment comparesthe absolute priority of the frequency of the current cell with the highest absolute priority.
- the user equipment checks the absolute priority class of the frequency of the current cell, and compares that class with the class of the highest absolute priority among all theabsolute priorities of all frequencies in the radio access network notification area of the user equipment.
- the user equipment may have multiple current cells (including a master cell, the secondary cell, and the like) , and the user equipment needs to obtain the absolute priority of all the frequencies of the current cell.
- the user equipment compares the class of one or moreabsolute priorities with the class of the highest absolute priority amongall theabsolute priorities of all frequencies in the radio access network notification area of the user equipment.
- S1014 user equipment detects all cells in the frequency with the highest absolute priority, when the absolute priority of the frequency of the current cell is lower than the highest absolute priority.
- the highest absolute priority among theabsolute priorities of all frequencies in the radio access network notification area of the user equipment may correspond to more than one frequency, then it is needed to detect the cells in the frequency withthe highest absolute priority.
- the user equipment compares the class of the highest absolute priority among theabsolute priorities of the frequencies of the current cells with the class of the highest absolute priority among theabsolute priorities of all frequencies in the radio accessnetwork notification area of the user equipment. If the highest absolute priority among all the frequencies in the radio access network notification area of the user equipment is higher than the highest absolute priorityamong the absolute priority of the frequency of the current cell, then all cells at this frequency will be detected.
- the user equipment when the user equipment has a plurality of current cells, the user equipment will compare the class of all the absolute priority of the frequencies where the current cell is located, with the class ofthe highest absolute priorityamong theabsolute priorities of all frequencies in the radio access network notification area of the user equipment. If the highest absolute priorityamong theabsolute priorities of all frequencies in the radio access network notification area of the user equipment is higher than the absolute priority of any of theabsolute priorities of the frequency of the current cell, then all cells at this frequency will be detected.
- S1015 user equipmentselectsa cell in the radio access network notification area among all cells in the frequency with the highest absolute priority, and measuring thequality of the cell in the radio access network notification area.
- the user equipment determines whether the cells are the one in the radio access network notification area. Although the frequenciesof some cells arein the radio access network notification area, a plurality of cells can be in the same frequency, so it cannot be determined that the cells corresponding to the frequency in the radio access network notification area are all in the radio access network notification area.
- the user equipment may receive the radio access network notification area configuration sent by the current base station, and obtain an explicit cell list included in the configuration. If the cell is in the explicit cell list, it indicates that the cell is in the radio access network notification area. Thus the user equipment can pick out the cell in the radio access network notification area from all cells with the highest absolute priority frequency.
- the system information broadcasted by the cell includes an identification (ID) of the radio access network/tracking area.
- ID an identification of the radio access network/tracking area.
- User equipment comparesthe ID with an ID ofthe cell in the radio access network notification area configuration, if these two IDs are the same or match, the cell is in the radio access network notification area. Therefore, the user equipment can pick out the cell in the radio access network notification area from all cells with the highest absolute priority frequency.
- tomeasuresthe quality of a cell is to measure at least one of reference signal received power (RSRP) and reference signal received quality (RSRQ) of the cell.
- RSRP reference signal received power
- RSRQ reference signal received quality
- at least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the cell may also be measured.
- S1016 user equipmentdeletesthe cell thatis a candidate cell that cannot be the reselected cell among the cell in the radio access network notification area. User equipmentsorts the remaining cells among the cell in the radio access network notification area according to the R criterion, and selectsthe cell ranked first in ranking to be the first-best cell.
- a cell can not be a candidate cell of the cells that can serve as areselected cell
- the cell may not serve as areselected cell, and may be deleted before each cell is sorted according to a predetermined absolute priority order, so as to reduce the workload of subsequent sorting step.
- the cell that can not be a candidate cell of the cells that can serve as areselected cell includes one or morekindsof a cell indicated as "reserved for other use” , a cell indicated as "barred cell” , and a cell indicated as "reserved for theoperator use” .
- the user equipment may determine whether the cell is a cell that can not be a candidate cell of the cells that can serve reselected cells.
- the list of cells that can not be a candidate cell of the cells that can serve as reselected cells may be pre-stored in the user equipment. If the cell or the identification of the cell is not stored in the list of cells that can not be a candidate cell of the cells that can serve as reselected cells, the cell is not a cell that can not be a candidate cell of the cells that can serve as areselected cell.
- the criterion for determining whether thecell is a cell that can not be a candidate cell of the cells that can serve as reselected cells may be pre-stored in the user equipment, and the user equipment determines whether the cell is a cell that can not be a candidate cell of the cells that can serve as reselected cells, according to the criterion.
- special identifications may be added to the cell that can not be a candidate cell of the cells that can serve as reselected cells, and the user equipment determines whether the first-best cell is a cell that can not be a candidate cell of the cells that can serve as reselected cells, according to whether the first-best cell carries the special identification.
- the user equipment sorts the remaining cells according to a R criterion [TS 38.304] , that is, the user equipment sorts each remaining cell according to a specified absolute priority, specifically sorting according to following two equations.
- Rn Qmeas, n + Qoffset
- the sorting may be performed according to Rs first, and then according to Rn when Rs is equal, or the sorting may be performed according to Rn first, and then, according to Rs when Rn is equal. After the sorting, the cell ranked first is the first-best cell. In other implementation scenarios, the sorting may also depends on one of Rs or Rn.
- Qmeas, s is the RSRP measurement used in the cell reselection.
- Qoffset within the frequency: if Qoffsets, n is valid, it is equal to Qoffsets, n, otherwise it is equal to zero.
- Qoffsets, n specifies the offset between two cells, and Qoffsetfrequency is the frequency-specific offset of E-UTRAN frequency with the same absolute priority.
- Qhyst specifies a hysteresis value for the ranking criteria.
- the above steps may not be performed in the order of the embodiment.
- the user equipment may first select cells in the radio access network notification area among all the cells in the frequency with the highest absolute priority, and then measure the quality of the cells. In this way it can reduce the number of cells that need to be measured.
- the user equipment may first select the cells in the radio access network notification area among all the cells in the frequency with the highest absolute priority, and select one or more of the top ones to measure their quality, after sorting the cells according to the R criterion, which can further reduce the number of cells that need to be measured.
- FIG. 3 is a flowchart diagram of the first embodiment of a method for determining whether a first-best cell can serve as areselected cell according to the present disclosure.
- the method for determining whether the first-best cell can be a reselected cell according to the present disclosure includes following steps.
- S1021 user equipment determines whether the quality of the first-best cellsatisfies the cell selection criteria.
- the user equipment compares the quality of the cell to a preset threshold.
- the reference signal received power (RSRP) of the cell and reference signal received quality (RSRQ) of the cell are measured, and if the RSRP and RSRQ of the cell are both higher than a preset threshold, the quality of the cell satisfiesthe cell selection criteria.
- the quality of the cell satisfiesthe cell selection criteria.
- At least one of a received signal strength indicator (RSSI) or a signal to interference noise ratio (RS-SINR) of the cell is also measured, and when the RSSI or the RS-SINR is higher than a preset threshold, the quality of the cell satisfiesthe cell selection criteria.
- RSSI received signal strength indicator
- RS-SINR signal to interference noise ratio
- S1022 when the quality of the first-best cellsatisfiesthe cell selection criteria: determining whether the first-best cell belongs to a part of the “list of forbidden tracking areas for roaming” , and/orbelonging to a public land mobile network which is not indicated as being equivalent to the registered public land mobile network, and if the first-best cell is neither a part of a "list of forbidden Tracking areas for roaming" nor a public land mobile network that is the public land mobile network not indicated as equivalent to registration, then the first-best cellcan serveas a reselected cell.
- the first-best cell if the first-best cell belongs to a part of the "list of forbidden Tracking areas for roaming" or belongs to a public land mobile network (PLMN) that is the PLMN not indicated as equivalent to registration, then the first-best cell cannot serve as areselected cell.
- PLMN public land mobile network
- Step S1016 it may also be performed Step S1016 to determine whether the first-best cell belongs to a part of the "list of forbidden Tracking areas for roaming" and/or belongs to a PUBLIC LAND MOBILE NETWORK that is the PLMN not indicated as equivalent to registration, to further reduce the amount of sorting workload.
- step S1021 and step 1022 may be reversed, that is, it may befirst determined that whether the cell is part of the "list of forbidden Tracking areas for roaming" , and/or belongs to a PLMN that is the PLMN not indicated as equivalent to registration, then the method turns to determine whether the quality of the cell satisfies the cell selection criteria.
- step S1023 If a suitable cell is found to be a reselected cell in step S1022, the method ends here, and if a suitable cell is not found, step S1023 is performed.
- S1023 user equipmentdeletes one or more frequencies with the highest absolute priority in the candidate radio access network notification area frequency set, and performing the method of selecting the first-best cell in the foregoing description, when the quality of the remaining cells in the one or more frequencies with the highest absolute priority does not satisfythe cell selection criteria, or the cells belong to the "list of forbidden Tracking areas for roaming" and/or belong to the public land mobile network that is the PLMN not indicated as equivalent to registration.
- step S1021 to step S1022 are sequentially performed on each cell in the sorting order in step S1016, until a suitable cell is found among the remaining cells in the one or more frequencies with the highest absolute priority to be the reselected cell. If the quality of the remaining cells in the one or more frequencies with the highest absolute priority does not satisfythe cell selection criteria, that is, there is no suitable cell found inthe one or more frequencies with the highest absolute priority to be the first-best cell, the user equipment will delete one or more frequencies with the highest absolute priority in the radio access network notification area of the user equipment in the candidate radio access network notification area frequency set.
- the absolute priority which is second only to the highest absolute priority, is configured as the current highest absolute priority.
- Step S1012-step S1016 are performed again to find the first-best cell, and then step S1021-step S1022/step S1023 is performed again until a first-best cellis found to be thereselected cell.
- the present disclosure may firstly select a suitable cell to serve as a reselected cell within the range of the radio access network notification area of the user equipment, and if it can be successfully found, it can avoid performing the RLAU operation of selecting the cells outside the radio access network notification area, thus reducing signaling overhead and power consumption, and saving resources.
- FIG. 4 is a schematic flowchart diagram of the second embodiment of a method for finding a first-best cell according to the present disclosure.
- the method for finding the first-best cell provided by the present disclosure includes the following steps.
- S2011 user equipment checksthe radio access network notification area frequency list, sorting and storing all the frequencies in the radio access network notification area frequency list from high to low according to their absolute priorities, to form a candidate radio access network notification area frequency set.
- S2012 user equipment checksthe candidate radio access network notification area frequency set to obtain one or more frequencies with the highest absolute priority.
- S2013 user equipment comparesthe absolute priority of the frequency of the current cell with the highest absolute priority.
- Step S2011-step S2013 is substantially the same as step S1011-step S1013 in the first embodiment of the method for finding the first-best cell of the present disclosure, and details are not repeated herein.
- the user equipment measuresthe quality of the current cell, and if the quality of the current cell satisfiesthe cell selection criteria, the current cell can serve as a reselected cell.
- the user equipment measures the quality of the current cell. In this implementation scenario, it is reference signal received power (RSRP) and reference signal received quality (RSRQ) of the current cell that may be measured. In other implementation scenarios, at least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the current cell may also be measured.
- RSRP reference signal received power
- RSSI areceived signal strength indicator
- RSSI asignal to interference noise ratio
- RS-SINR asignal to interference noise ratio
- the current cell can serve as the reselected cell.
- the reference signal received power (RSRP) and the reference signal received quality (RSRQ) of the current cell are measured, if the RSRP and the RSRQ of the current cell are both higher than a preset threshold, the quality of the current cell satisfies the cell selection criteria.
- one of the RSRP and the RSRQ of the current cell may be higher than a preset threshold, and the quality of the current cell satisfies the cell selection criteria.
- At least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the current cell is also measured, and when the RSSI Or the RS-SINR is higher than a preset threshold, the quality of the current cell satisfies the cell selection criteria.
- RSSI areceived signal strength indicator
- RS-SINR asignal to interference noise ratio
- the frequency in the candidate radio access network notification area frequency list, with the absolute prioritylower than the absolute priority of the frequency of the current cell is measured.
- the specific measuring steps and measuring contents are as described in step S1014-step S1016 as well as step S102, and details are not described herein again.
- the present embodiment when there is no suitable cell in the radio access network notification area of the user equipment to be found to be the reselected cell, it would be better to continue communication via the current cell, thereby avoiding signaling overhead and power consumption caused by expanding the selection rangeagain.
- the current cell is not suitable for continuing communication, it would be better to selects a suitable cell within the range of the radio access network notification area of the user equipment tobe the reselected cell, thus avoidingperforming the RLAU operation of selecting the cells outside the radio access network notification area, thus reducing signaling overhead and power consumption, and saving resources.
- FIG. 5 is a flowchart diagram of the second embodiment of a communication method provided by the present disclosure. As shown in FIG. 5, the communication method provided by the present disclosure includesfollowing steps:
- S301 user equipment findsat least one first-best cell in a range of the radio access network notification area, where the first-best cellhas the quality satisfying the cell selection criteria, and a highest absolute priority among all the cells with the qualitysatisfying the cell selection criteria in the radio access network notification area.
- Step S301 is substantially the same as step S101 in the first embodiment of the communication method provided by the present disclosure, and details are not described herein again.
- the first-best cellcan serve as a reselected cell, and if the first-best cell is not found, user equipment will find a second-best cell among all available cells, wherein the second-best cell has qualitysatisfying the cell selection criteria, and the second-best cell has a highest absolute priority among all the cells with the qualitysatisfying the cell selection criteria in the available cells.
- FIG. 6 is a schematic flowchart of an embodiment of a method for finding a second-best cell according to the present disclosure.
- the method for finding a second-best cell provided by the present disclosure includesfollowing steps.
- S3021 user equipment checksall available frequencies, sorting and storing all the available frequencies from high to low according to their absolute priority class, to form a candidate frequency set.
- the user equipment checks all available frequencies, and sorts the available frequencies from high to low according to their absolute priority classes, on the basis ofpre-obtained absolute priority of different frequencies. These frequencies are stored in the sorting order to form a candidate frequency set.
- S3022 user equipment checks the candidate frequency set to obtain the frequency with the highest absolute priority.
- the user equipment checks for one or more frequencies with the highest absolute priority in the candidate frequency set. It should be noted that a plurality of different frequencies might also have the same absolute priority. The user equipment finds the class of theabsolute priority of the one or more frequencies according to the absolute priority corresponding to the different frequencies that have been received. In other implementation scenarios, because all available frequencies and their correspondingabsolute priorities are stored in pairs, when the frequency with the highest absolute priority is found, the class of its absolute priority has been acquired. In other implementation scenarios, the user equipment may record the highest absolute priority among all theabsolute priorities when all available frequencies are sorted from high to low according to the class of their absolute priority in step S3021.
- S3023 user equipment deletesa cell belonging to the candidate cell that cannot be a reselected cell among all cells at the frequency with the highest absolute priority, and/or deletesa cell outside the range of the radio access network notification area among all cells at the frequency with the highest absolute priority.
- a cell is a candidate cell that cannot bea reselected cell, that is, the cell is unlikely to be a reselected cell, and the cellmay be deleted before each cell being sorted according to a specified absolute priority order, to reduce the workload of subsequent sorting process.
- the cell that is a candidate cell not capable to be areselected cell includes one or more of a cellindicated as "reserved for other use” , a cell indicated as "barred cell” , and a cell indicated as "reserved for theoperator use"
- the user equipment may determine whether cell can not be a candidate cell of the cells that can serve reselected cells.
- the list of cells an not be a candidate cell of the cells that can serve reselected cells may be pre-stored in the user equipment. If the cell or the identification of the cell is not stored in the list of cells thatcan not be a candidate cell of the cells that can serve reselected cells, the cell is not a cell of a candidate cell that cannot serve as the reselected cell.
- the criterion for determining a cell of a candidate call that cannot be the reselected cell may be pre-stored in the user equipment, and the user equipment determines whether the cell is a cell that can not be a candidate cell of the cells that can serve reselected cells, according to the criterion.
- special identifications may be added to the cell that can not be a candidate cell of the cells that can serve reselected cells, and the user equipment determines whether the first-best cell is a candidate cell that cannot be used as the reselected cell, according to whether the first-best cell carries the special identification.
- S3024 user equipment sortsthe cells according to a modified R criterion, and selecting a cell ranked first in ranking as the second-best cell.
- the user equipment sorts the remaining cells in the frequency with the highest absolute priority according to amodified R criterion, that is, all cells are sorted according to the defined absolute priority, specifically sorting according to following two equations.
- Rn Qmeas, n + Qoffset + QINACTIVE
- the sorting may be performed according to Rs first, and then according to Rn when Rs is equal, or the sorting may be performed according to Rn first, and then, according to Rs when Rn is equal.
- the cell ranked first is the second-best cell.
- the sorting may also depends on one of Rs or Rn.
- Qmeas, s is the RSRP measurement used in the cell reselection. For Qoffset, within the frequency: if Qoffsets, n is valid, it is equal to Qoffsets, n, otherwise it is equal to zero. For frequency spacing: if Qoffsets, n is valid, it equals to Qoffsets, nplus Qoffsetfrequency, otherwise it is equal to Qoffsetfrequency.
- Qoffsets specifies the offset between two cells, and Qoffsetfrequency is the frequency-specific offset of E-UTRAN frequency with the same absolute priority.
- Qhyst specifies a hysteresis value for the ranking criteria, and QINACTIVE is an additional offset.
- NR [R2-1803978] and [R2-1802931] it is not defined whether the cell supports an inactive state of radio resource control, and therefore if at least one cell selected includes a cell that does not support the inactive state of radio resource control, when the user equipment is connected to the cell, it is needed to convert into an idle state of radio resource control, which in turn will result in higher additional power consumption.
- the additional offset is configured to enable the user equipment to select a cell supporting an inactive state of the radio resource control, when the user equipment selects a cell.
- Each cell includes information of whether it supports the inactive state of the radio resource control in the system information, and transmits the system information to the user equipment by broadcasting.
- the additional offset can be either specified by the cell or by the user equipment.
- the cell specifies the additional offset
- the system information broadcasted by each cell includes an additional offset QINACTIVE.
- the additional offset of each cell is different.
- the user equipment may also specify the additional offset, so that each cell has the same offset and shares a common offset.
- the current base station transmits the common offset to the user equipment through RRCConnectionReleasemessage.
- the additional offsets of all cells supporting the inactive state of radio resource control are equal.
- the cell needs to support the inactive state of the radio resource control, and the user equipment is likely to select a cell that does not support the inactive state of radio resource control when selecting the reselected cell. Therefore, when the user equipment receives equal or unequal additional offsets from different cells, the user equipment can increase the probability of selecting a cell supporting the inactive state of the radio resource control according to the additional offset.
- the sorting of the cell absolute priority takes its additional offset QINACTIVE into consideration, that is, whether the cell supports an inactive state of radio resource control is considered.
- the probability that the second-best cell selected in this way supports the inactive state of the radio resource control will be high.
- FIG. 7 is a flowchart diagram of the first embodiment of a method for determining whether a second-best cell can serve as areselected cell according to the present disclosure.
- the method for determining whether the second-best cell can be a reselected cell according to the present disclosure includes following steps.
- S3031 user equipmentdetermineswhether the quality of the second-best cellsatisfies a cell selection criteria.
- the user equipment compares the quality of the cell to a preset threshold.
- the reference signal received power (RSRP) of the cell and reference signal received quality (RSRQ) of the cell are measured, and if the RSRP and RSRQ of the cell are both higher than a preset threshold, the quality of the cell satisfies the cell selection criteria.
- the quality of the cell satisfies the cell selection criteria.
- At least one of a received signal strength indicator (RSSI) or a signal to interference noise ratio (RS-SINR) of the cell is also measured, and when the RSSI or the RS-SINR is higher than a preset threshold, the quality of the cell satisfies the cell selection criteria.
- RSSI received signal strength indicator
- RS-SINR signal to interference noise ratio
- the second-best cell when the quality of the second-best cellsatisfiesthe cell selection criteria, user equipmentdetermineswhether the second-best cell belongs to a part of the “list of forbidden Tracking areas for roaming” , and/or the belonging to a public land mobile network which is not indicated as being equivalent to the registered public land mobile network, and if the second-best cell is neither a part of a "list of forbiddentracking areas for roaming" nor a public land mobile network that is the public land mobile network not indicated as equivalent to registration, the first-best cellcan serve as a reselected cell.
- the second-best cell if the second-best cell belongs to a part of the "list of forbidden Tracking areas for roaming" or belongs to a public land mobile network (PLMN) that is the PLMN not indicated as equivalent to registration, then the second-best cell cannot serve as areselected cell.
- PLMN public land mobile network
- step S1021 and step 1022 may be reversed, that is, it may be determined first whether the cell is part of the "list of forbidden Tracking areas for roaming" , and/or belongs to a PLMN that is the PLMN not indicated as equivalent to registration, then determining whether the quality of the cell satisfies the cell selection criteria.
- step S3032 If a suitable cell is found as a reselected cell in step S3032, the method ends here, and if not, then step S3033 is performed.
- step S3031 to step S3032 are sequentially performed on each cell in the sorting order in step S3024, until a suitable cell is found among the remaining cells in the one or more frequencies with the highest absolute priority to be the reselected cell. If the quality of the remaining cells in the one or more frequencies with the highest absolute priority does not satisfy the cell selection criteria, that is, there is no suitable cell found inthe one or more frequencies with the highest absolute priority to be the second-best cell, the user equipment will delete one or more frequencies with the highest absolute priority in the radio access network notification area of the user equipment in the candidate radio access network notification area frequency set.
- the absolute priority which is second only to the highest absolute priority, is configured to be the current highest absolute priority.
- Step S3022-step S3023 are performed again to find the second-best cell, and then step S3031-step S3032/step S3033 is performed again until a second-best cellis found to be thereselected cell.
- the present disclosure may firstly select a suitable cell as a reselected cell within the range of the radio access network notification area of the user equipment, and if it can be successfully found, it can avoid performing the RLAU operation of selecting the cells outside the radio access network notification area.
- the cell supporting the inactive state of the radio resource control is selected, avoiding the switch needed in selecting the cell not supporting the inactive state of the radio resource control, which can reduce signaling overhead and power consumption and save resources.
- FIG. 8 is a schematic flowchart diagram of the third embodiment of a communication method provided by the present disclosure.
- the communication method provided by the present disclosure includes the following steps.
- each frequency is assigned an absolute priority.
- Theabsolute priorities of different frequencies will be transmitted to the user equipment by one or more method of following ways, namely, 1) in system information broadcast by the cell, 2) in the RRCConnectionRelease message sent by a current base station, and 3) by inheriting from a previous radio access technology (RAT) , during RAT cell selection (or reselection) .
- the absolute priority of each frequency may be sent to the user equipment by other methods, for example, by pre-defining the absolute priority of each frequency in the user equipment, and the like.
- a radio access network notification area frequency list includes all frequencies in the range of the radio access network notification area of the user equipment and theirabsolute priorities.
- the current base station connected to the user equipment sends the radio access network notification area frequency list to the user equipment through RRCConnectionReleasemessage.
- An additional offset is configured to enable the user equipment to select a cell supporting an inactive state of the radio resource control when the user equipment selects a cell.
- Each cell includes information of whether it supports the inactive state of the radio resource control in the system information, and transmits the system information to the user equipment by broadcasting.
- the additional offset can be either specified by the cell or by the user equipment.
- the cell specifies the additional offset
- the system information broadcasted by each cell includes an additional offset QINACTIVE.
- the additional offset of each cell is different.
- the user equipment may also specify the additional offset, so that each cell has the same offset and shares a common offset.
- the current base station sends the common offset to the user equipment through RRCConnectionReleasemessage.
- the additional offsets of all cells supporting the inactive state of radio resource control are equal.
- the cell needs to support the inactive state of the radio resource control, and the user equipment is likely to select a cell that does not support the inactive state of radio resource control when selecting the reselected cell. Therefore, when the user equipment receives equal or unequal additional offsets from different cells, the user equipment can increase the probability of selecting a cell supporting the inactive state of the radio resource control according to the additional offset.
- the user equipment receives and stores parameters and lists needed for the communication method, such as absolute priority of frequency, radio access network notification area frequency list, and additional offset, etc.
- S402 user equipmentchecksthe radio access network notification area frequency list, and sorting and storing all the frequencies in the radio access network notification area frequency list according to their absolute priority class from high to low, to form a candidate radio access network notification area frequency set.
- the user equipment checks the radio access network notification area frequency list sent by the current base station, and obtaining all the frequencies in the range of the radio access network notification area of the user equipment. Based on the pre-receivedabsolute priorities of different frequencies, the user equipment sorts the frequencies from high to low according to theirabsolute priorities and store the sorted frequencies to form a candidate frequency set of the access network notification area.
- all frequencies in the radio access network notification area of the user equipment and the correspondingabsolute priorities are stored in pairs, or stored in pairs and in order of from high to low or from low to high according to their absolute priority class to form a candidate frequency set of the radio access network notification area.
- S403 user equipmentchecksthe candidate radio access network notification area frequency set to obtain one or more frequencies with the highest absolute priority.
- the user equipment checks one or more frequencies with the highest absolute priorityin the frequency set of the candidate radio access network notification area. It should be noted that there might be a plurality of different frequencies that have the same absolute priority. The user equipment finds the absolute priority class of the one or more frequencies according to the absolute priority corresponding to the different frequencies that have been received. In other implementation scenarios, since all frequencies in the radio access network notification area of the user equipment and their correspondingabsolute priorities are stored in pairs, therefore when the frequency with the highest absolute priority is found, the absolute priorityclass of the frequency has already been obtained. In other implementation scenarios, Step S1011, the user equipment may record the highest absolute priority in theabsolute priorities, when all the frequencies in the radio access network notification area of the user equipment according to their absolute priority class are sorted from high to low.
- S404 user equipmentdetermines whether the highest absolute priority is higher than the absolute priority of the frequency of the current cell.
- the user equipment checks the absolute priority class of the frequency of the current cell, and compares that class with the class of the highest absolute priority among all theabsolute priorities of all frequencies in the radio access network notification area of the user equipment.
- the user equipment may have multiple current cells (including a master cell, the secondary cell, and the like) , and the user equipment needs to obtain the absolute priority of all the frequencies of the current cell.
- the user equipment compares the class of one or moreabsolute priorities with the class of the highest absolute priority amongall theabsolute priorities of all frequencies in the radio access network notification area of the user equipment.
- the user equipment compares the class of the highest absolute priority among theabsolute priorities of the frequencies of the current cells with the class of the highest absolute priority among theabsolute priorities of all frequencies in the radio accessnetwork notification area of the user equipment. If the highest absolute priority among all the frequencies in the radio access network notification area of the user equipment is higher than the highest absolute priorityamong the absolute priority of the frequency of the current cell, then all cells at this frequency will be detected.
- the user equipment when the user equipment has a plurality of current cells, the user equipment will compare the class of all the absolute priority of the frequencies where the current cell is located, with the class of the highest absolute priorityamong theabsolute priorities of all frequencies in the radio access network notification area of the user equipment. If the highest absolute priorityamong theabsolute priorities of all frequencies in the radio access network notification area of the user equipment is higher than the absolute priority of any of theabsolute priorities of the frequency of the current cell, then all cells at this frequency will be detected.
- step S405 If the highest absolute priority is higher than the absolute priority of the frequency of the current cell, step S405 is performed; otherwise, step S406 is performed.
- S405 user equipmentdetectsall cells in the frequency with the highest absolute priority.
- the highest absolute priority among theabsolute priorities of all frequencies in the radio access network notification area of the user equipment may correspond to more than one frequency, then during the measuring operation, it is needed to detect the quality of all cells in the frequency withthe highest absolute priority.
- S406 user equipmentdetermineswhether quality of the current cell satisfies a cell selection criteria.
- the user equipment measures the quality of the current cell. In this implementation scenario, it is reference signal received power (RSRP) and reference signal received quality (RSRQ) of the current cell that may be measured. In other implementation scenarios, at least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the current cell may also be measured.
- RSRP reference signal received power
- RSSI areceived signal strength indicator
- RSSIR asignal to interference noise ratio
- RS-SINR asignal to interference noise ratio
- step S407 If the quality of the current cell satisfies the cell selection criteria, step S407 is performed; otherwise, step S408 is performed.
- S407 user equipmentstops the measurement, and continuing to regard the current cell as the reselected cell.
- the current cell can serve as thereselected cell. Since the suitable cell has been found to continue communication, there is no need to measure other cells, and the measurement process can be stopped.
- the reference signal received power (RSRP) and the reference signal received quality (RSRQ) of the current cell are measured, if the RSRP and the RSRQ of the current cell are both higher than a preset threshold, the quality of the current cell satisfies the cell selection criteria.
- one of the RSRP and the RSRQ of the current cell may be higher than a preset threshold, and the quality of the current cell satisfies the cell selection criteria.
- At least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the current cell is also measured, and when the RSSI or the RS-SINR is higher than a preset threshold, the quality of the current cell satisfies the cell selection criteria.
- RSSI areceived signal strength indicator
- RS-SINR asignal to interference noise ratio
- S408 user equipmentmeasures the quality of all cells with the absolute priority lower than the frequency of the current cell.
- the frequency in the candidate radio access network notification area frequency list, with an absolute priority lower than the absolute priority of the frequency of the current cell is measured.
- the quality at the frequency with the highest absolute priority may be measured. Since the absolute priority of all frequencies is lower than the absolute priority of the frequency of the current cell, the quality of any absolute priority frequency can also be measured.
- S409 user equipmentselectsa cell within the radio access network notification area among all cells in the frequency with the highest absolute priority, and measuring thequality of the cell in the radio access network notification area.
- the user equipment determines whether the cells are the one in the radio access network notification area.
- the frequency of some cells is in the radio access network notification area, a plurality of cells can be in the same frequency, so it cannot be determined that the cells corresponding to the frequency in the radio access network notification area are all in the radio access network notification area.
- the user equipment may receive the radio access network notification area configuration sent by the current base station, and obtain an explicit cell list included in the configuration. If the cell is in the explicit cell list, it indicates that the cell is in the radio access network notification area. Thus the user equipment can pick out the cell in the radio access network notification area from all cells with the highest absolute priority frequency.
- the system information broadcasted by the cell includes an identification (ID) of the radio access network/tracking area. Comparing the ID with an ID ofthe cell in the radio access network notification area configuration, if these two IDs are the same or match, the cell is in the radio access network notification area. Therefore, the user equipment can pick out the cell in the radio access network notification area from all cells with the highest absolute priority frequency.
- ID identification
- measuring the quality of a cell is to measure at least one of reference signal received power (RSRP) and reference signal received quality (RSRQ) of the cell.
- RSRP reference signal received power
- RSRQ reference signal received quality
- at least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the cell may also be measured.
- user equipmentdeletesthe cell can not be a candidate cell of the cells that can serve as areselected cell among the cells in the radio access network notification area, and sorting remaining cells among the cells in the radio access network notification area according to a R criterion, and selecting the cell ranked first in the ranking as the first-best cell.
- a cell is a candidate cell that cannot serve as areselected cell
- the cell may not serve as areselected cell, and may be deleted before each cell is sorted according to a predetermined absolute priority order, so as to reduce the workload of subsequent sorting step.
- the cell that is a candidate cell not capable to be areselected cell includes one or more or a cell indicated as "reserved for other use” , a cell indicated as “barred cell” , and a cell indicated as "reserved for theoperator use” .
- the user equipment may determine whether the cell is a cell can not be a candidate cell of the reselected cell.
- the list of cells of the candidate cell that cannot be the reselected cell may be pre-stored in the user equipment. If the cell or the identification of the cell is not stored in the list of cells of the candidate cell that cannot be the reselected cell, the cell is not a cell of a candidate cell that cannot serve as the reselected cell.
- the criterion for determining a cell is the cell that can not be a candidate cell of the cells that can serve as areselected cell may be pre-stored in the user equipment, and the user equipment determines whether the cell is a cellthat can not be a candidate cell of the cells that can serve as areselected cell, according to the criterion.
- special identifications may be added to the cell that can not be a candidate cell of the cells that can serve as areselected cell, and the user equipment determines whether the first-best cell is a candidate cell that cannot be used as the reselected cell, according to whether the first-best cell carries the special identification.
- the user equipment sorts the remaining cells according to a R criterion [TS 38.304] , that is, sorts each remaining cell according to a specified absolute priority, specifically sorting according to following two equations.
- Rn Qmeas, n + Qoffset
- the sorting may be performed according to Rs first, and then according to Rn when Rs is equal, or the sorting may be performed according to Rn first, and then, according to Rs when Rn is equal.
- the cell ranked first is the first-best cell.
- the sorting may also depends on one of Rs or Rn.
- Qmeas, s is the RSRP measurement used in the cell reselection.
- Qoffset within the frequency: if Qoffsets, n is valid, it is equal to Qoffsets, n, otherwise it is equal to zero.
- Qoffsets, n specifies the offset between two cells, and Qoffsetfrequency is the frequency-specific offset of E-UTRAN frequency with the same absolute priority.
- Qhyst specifies a hysteresis value for the ranking criteria.
- S411 user equipmentdetermineswhether the quality of the first-best cell is higher than a threshold, and determining whether the first-best cell belongs to a part of a “list of forbidden Tracking areas for roaming” , and/or belong to a public land mobile network that is the public land mobile network not indicated as equivalent to registration.
- the user equipment compares the quality of the cell to a preset threshold.
- the reference signal received power (RSRP) of the cell and reference signal received quality (RSRQ) of the cell are measured, and if the RSRP and RSRQ of the cell are both higher than a preset threshold, the quality of the cell satisfies the cell selection criteria.
- the quality of the cell satisfies the cell selection criteria.
- At least one of a received signal strength indicator (RSSI) or a signal to interference noise ratio (RS-SINR) of the cell is also measured, and when the RSSI or the RS-SINR is higher than a preset threshold, the quality of the cell satisfies the cell selection criteria.
- RSSI received signal strength indicator
- RS-SINR signal to interference noise ratio
- the first-best cell if the first-best cell belongs to a part of the "list of forbiddentracking areas for roaming" or belongs to a public land mobile network (PLMN) that is the PLMN not indicated as equivalent to registration, then the first-best cell cannot serve as areselected cell.
- PLMN public land mobile network
- step S1016 it may also be performed in step S1016 to determine whether the first-best cell belongs to a part of the "list of forbidden tracking areas for roaming" and/or belongs to a PLMN that is the PLMN not indicated as equivalent to registration, to further reduce the amount of sorting workload.
- step S412 If the quality of the cell satisfies the cell selection criteria and the cell belongs to neither a part of a "list of forbidden tracking areas for roaming" nor a public land mobile network that is the public land mobile network not indicated as equivalent to registration, then in step S412, the first-best cellcan serve as the reselected cell, and the process ends. If the quality of the cell does not satisfy the cell selection criteria or the cell belongs to a part of a "list of forbidden tracking areas for roaming" or a public land mobile network that is the public land mobile network not indicated as equivalent to registration, then the step S413 is performed.
- S413 user equipment deletesthe frequency of the first-best cell in the candidate radio access network notification area frequency set.
- the user equipment will delete the frequency of the first-best cell in the candidate radio access network notification area frequency set. In another implementation scenario, the user equipment may delete one or more frequencies with the highest absolute priority within the radio access network notification area of the user equipment.
- S414 user equipment determines whether the candidate radio access network notification area frequency set is empty.
- step S403 After deleting the frequency of the first-best cell, determining whether there is still a remaining frequency in the candidate radio access network notification areafrequency set, and if yes: executing step S403 of selecting ansuitable cell from the remaining cells corresponding to the frequency to be thereselected cell, and if not, step S415 is performed.
- S415 user equipment performsbaseline cell reselection based on the absolute priority and a modified R criterion.
- Step S415 is similar to step S302-S303 of the communication method provided by the present disclosure, and details are not described herein again.
- the present disclosure may firstly select a suitable cell as a reselected cell within the range of the radio access network notification area of the user equipment, and if it can be successfully found, it can avoid performing the RLAU operation of selecting the cells outside the radio access network notification area.
- the cell supporting the inactive state of the radio resource control is selected, avoiding the switch needed in selecting the cell not supporting the inactive state of the radio resource control, which can reduce signaling overhead and power consumption, thus saving resources.
- FIG. 9 is a structural view of an embodiment of a testing device according to the present disclosure.
- the user equipment 10 includes a processor 11, a communication circuit 12, and a storage circuit 13.
- the processor 11 is connected to the communication circuit 12 and the storage circuit 13.
- the storage circuit 13 is configured to store parameters and lists required to perform the communication method, such as absolute priority of frequency, radio access network notification area frequency list, and additional offsets, etc.
- the processor 11 controls the communication circuit 12 to realize selection of a suitable cell within the range of the radio access network notification area of the user equipment 10 to be a reselected cell. If all cells in the radio access network notification area are not suitable to be the reselected cell, and the quality of the current cell does not satisfythe cell selection criteria, the processor 11 controls the communication circuit 12 to firstly select the cell supporting the inactive state of radio resources control to be the reselected cell.
- the processor is coupled to the communication circuit and the storage circuit to realize firstly selecting a suitable cell in the radio access network notification area to be the reselected cell, which can reduce signaling overhead and power consumption.
- the cell that supports the inactive state of the radio resource control is tended to get selected to be the reselected cell, which can further reduce the signaling overhead and power consumption caused by switch, thereby saving resources.
- FIG. 10 is a schematic structural diagram of andevice with a storage function in the present disclosure.
- the device 20 with the storage function stores at least one program data 21, the program data 21 configured to execute the automatic testing method as shown in any one of FIGs. 1 -8.
- the device with the storage function may be a storage chip or a hard disk in a terminal, a removable hard disk, or be other readable, writeable, and storable device such as a USB flash drive and an optical disk, and may also be a server or the like.
- the program data stored in the device of the embodiment with the storage function in this embodiment can be used to select a suitable cell to be the reselected cell, which may save resources.
- the present disclosure firstly selects a suitable cell among cells within the radio access network notification area of the user equipment to be the reselected cell, thus avoiding signaling overhead and power consumption caused by the RLAU operation when selecting a cell outside the range of the radio access network notification area, thereby saving resources.
- the cell supporting the inactive state of the radio resource control is tended to get selected to be the reselected cell, avoiding signaling overhead and power consumption caused by the switchneeded in selecting the cell not supporting the inactive state of the radio resource control, thus saving resources.
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Abstract
The present disclosure discloses a communication method, a user equipment, and a device with storage function. The method includes: finding at least one first-best cell in a range of RAN notification area, the first-best cell with communication qualities satisfying cell selection criteria, and the first-best cell is the highest absolute priority among all cells with communication qualities satisfying cell selection criteria in the RAN notification area; if the first-best cell is found, making the first-best cell serve as a reselected cell, and if not, finding a second-best cell among all available cells, the second-best cell with communication qualities satisfying cell selection criteria, and the second-best cell is the highest absolute priority among all cells with the quality satisfying the cell selection criteria in the available cells; and if the second-best cell is found, making the second-best cell serve as the reselected cell.
Description
The present disclosure generally relates to the technical field communications, especially a communication method, a user equipment, and a device with storage function.
In a new radio (NR) network, in order to reduce signaling overhead, power consumption, and time delay, the user equipment needs to stay in the “always connected” mode. Thus, a radio resource control inactive state (RRC_INACTIVE) is introduced. When the user equipment is in the radio resource control inactive state, it maintains the connection with core network (CN) -radio access network (RAN) , but disconnected its connection to the RAN. When the user equipment is a radio resource control inactive state, itmay remain in a moving state, and thus move out of the range of the current camping cell. Under such circumstance, cell reselection is need to obtain at least one suitable cell to be thereselected cell. The reselected cell (s) may serve as a new resident cell for the user equipment.
In the process of cell reselection, reselected cell if the selected cell (s) is outside the radio access network notification area, the user equipment needs to perform RAN-based location update (RLAU) operation, which will result in high signaling overhead and power consumption. In addition, it cannot be determined whetherall cells support the inactive state of the radio resource control. If the selected cell (s) includes a cell that does not support the inactive state of the radio resource control, when the user equipment connects to that cell, it needs to switchto the radio resource control idle stateto complete the cell reselection. This switch also results in high power consumption.
SUMMARY
The technical problem to be resolved by the present disclosure is to provide a communication method, a user equipment and a device with a storage function, in order to reduce signaling overhead, power consumption, and saving resources.
In order to solve the above technical problem, the first aspect of the present disclosure provides a communication method. The method will find at least one first-best cell in the range of a radio access network notification area. The first-best cell satisfiesthe cell selection criteriaand has the highest absolute priority among all the cells thatsatisfythe cell selection criteria in the radio access network notification area; If the first-best cell is found, it will serve as the reselected cell. Otherwise, the method search for thesecond-best cell among all available cells. The second-best cellsatisfiesthe cell selection criteria, and has the highest absolute priority among all the cells thatsatisfy the cell selection criteria in all available cells. If found, the second-best cellwill serve as the reselected cell.
In order to solve the above technical problem, thesecond aspect of the present disclosure provides a user equipment. The user equipment includes a processor, a communication circuit and a storage unit, which are all connected to each other to implement the method of the first or the second aspect of the present disclosure.
In order to solve the above technical problem, thethird aspect of the present disclosure provides a device with storage function. The device stores program data, which can be executed to achieve the above mentioned procedure.
The present disclosure has the advantages that aredifferent from the case of the prior art. the present disclosure first selects at least one suitable cell among cells within the radio access network notification area as the reselected cell. If this step is successful, the RAN-based location update (RLAU) operation performed by cells outside the radio access network notification area can be avoided. When there is no suitablecell in the range of the radio access network notification area of the user equipmentthat can serve as the reselected cell, the cell supporting the inactive state of the radio resource control is selected to be the reselected cell. If the cell is successfully found, the resourcesneeded in the case that the user equipment needs to switch to the idle state of the radio resource control whena cell that does not support the inactive state of the radio resource control is selected. In the process of cell reselection, the method not only considers the signal quality of the cell, but also the absolute priority of the cell. The cells in the RAN notification area generally have the highest absolute priority, followed by the cells supporting the inactive state of the radio resource control, which reduces the signaling overhead and power consumption caused by PLAUand the RRC_IDLE operation performed by the user equipment, thus saving resources.
FIG. 1 is a flow chart of the first embodiment of a communication method of the present disclosure.
FIG. 2 is a flow chart of the first embodiment offinding a first-best cell of the present disclosure.
FIG. 3 is a flowchart of the first embodiment of a method for determining whether a first-best cell can serve as a reselected cell according to the present disclosure.
FIG. 4 is a schematic flow chart of the second embodiment of a method for searching for a first-best cell according to the present disclosure.
FIG. 5 is a flow chart of the second embodiment of a communication method of the present disclosure.
FIG. 6 is a schematic flow chart of an embodiment of a method for finding a second-best cell according to the present disclosure;
FIG. 7 is a schematic flowchart of the first embodiment of a method for determining whether a second-best cell can serve as a reselected cell according to the present disclosure.
FIG. 8 is a flow chart of the third embodiment of a communication method of the present disclosure.
FIG. 9 is a schematic diagram of the structure of a user equipment inthe first embodiment of the present disclosure.
FIG. 10 is a schematic diagram of the structure of the first embodiment ofa device with storage function in the present disclosure.
The technical schemes in the embodiments of the present disclosure will now be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure, and it will be apparent that the described embodiments are merely part of the embodiments of the disclosure, and are not all embodiments. All other embodiments obtained based on the embodiments in the present disclosure by those of ordinary skill in the art without making creative work are within the scope of the present disclosure.
Referring to FIG. 1, FIG. 1 is a flowchart diagram of the first embodiment of a communication method provided by the present disclosure. As shown in FIG. 1, the communication method provided by the present disclosure includes the following steps.
S101: user equipmentfinds at least one first-best cell in therange of a radio access network notification area, where the first-best cellhas quality satisfyingthe cell selection criteria, and the first-best cellhasthe highest absolute priority among all the cells satisfyingcell selection criteria in the radio access network notification area.
In the new radio (NR) network, in order to reduce signaling overhead, power consumption, and time delay, it is needed to keep the user equipment stay in a “always connected” mode, thus introduces an inactive state of radio resource control. In the NR network, the user equipment in the inactive state of the radio resource control is configured with an RAN notification area (RNA) range. When the user equipment moves out of the current RNA range, the user equipment needs to execute a RAN-based location update (RLAU) operation, and this operation will require the user equipment to send and/or receive some radio resource control (RRC) signaling information, which will result in a higher signaling overhead and power consumption, further causing a resource waste. Therefore, when a reselected cell selected by the user equipment is a cell outside the range of the radio access network notification area, the RLAU operation needs to be performed. In order to reduce the signaling overhead and power consumption during the user equipment communication and avoid unnecessary resource waste, in the present disclosure, it is better to find a suitable cell to serve as a reselected cell within the range of the current radio access network notification area of the user equipment.
In a specific implementation scenario, each frequency is assigned an absolute priority. Theabsolute priorities of different frequencies will be transmitted to the user equipment by one or more methodsinfollowing ways, namely, 1) in system information broadcast by the cell, 2) in the RRCConnectionRelease message sent by a current base station, and 3) by inheriting from a previous radio access technology (RAT) , during RAT cell selection (or reselection) . In other implementation scenarios, the absolute priority of each frequency may be sent to the user equipment by other methods, for example, by pre-defining the absolute priority of each frequency in the user equipment, and the like.
A radio access network notification area frequency list includes all frequencies in the range of the radio access network notification area of the user equipment and theirabsolute priorities. The current base station connected to the user equipment sends the radio access network notification area frequency list to the user equipment byRRCConnectionReleasemessage.
Specifically, also referring to FIG. 2, which is a schematic flowchart of the first embodiment of a method for finding thefirst-best cell according to the present disclosure. The method of finding the first-best cell, provided by the present disclosure, includes the following steps.
S1011: user equipmentchecks a radio access network notification area frequency list, and storesthe frequencies in the radio access network notification area frequency list from high to low according to theabsolute priority class to form a candidate frequency set of the access network notification area.
In a specific implementation scenario, the user equipment checks the radio access network notification area frequency list sent by the current base station, and obtaining all the frequencies in the range of the radio access network notification area of the user equipment. Based on the pre-receivedabsolute priorities of different frequencies, the user equipment sorts the frequencies from high to low according to theirabsolute priorities and store the sorted frequencies to form a candidate frequency set of the access network notification area.
In other implementation scenarios, in order to facilitate a subsequent checking on the absolute priority of a certain frequency or the frequency corresponding to a certain absolute priority, all frequencies in the radio access network notification area of the user equipment and the correspondingabsolute priorities are stored in pairs, or stored in pairs and in an order of from high to low or from low to high according to their absolute priority class to form a candidate frequency set of the radio access network notification area.
S1012: user equipment checksthe candidate frequency set of the radio access network notification area to obtain one or more frequencies with the highest absolute priority.
In a specific implementation scenario, the user equipment checks one or more frequencies with the highest absolute priorityin the frequency set of the candidate radio access network notification area. It should be noted that there might be a plurality of different frequencies that have the same absolute priority. The user equipment finds the absolute priority class of the one or more frequencies according to the absolute priority corresponding to the different frequencies that have been received. In other implementation scenarios, since all frequencies in the radio access network notification area of the user equipment and their correspondingabsolute priorities are stored in pairs, therefore when the frequency with the highest absolute priority is found, the absolute priorityclass of the frequency has already been obtained. In other implementation scenarios, in step S1011, the user equipment may record the highest absolute priority in theabsolute priorities, when all the frequencies in the radio access network notification area of the user equipment according to their absolute priority class are sorted from high to low.
S1013: user equipment comparesthe absolute priority of the frequency of the current cell with the highest absolute priority.
In a specific implementation scenario, the user equipment checks the absolute priority class of the frequency of the current cell, and compares that class with the class of the highest absolute priority among all theabsolute priorities of all frequencies in the radio access network notification area of the user equipment. It should be noted that the user equipment may have multiple current cells (including a master cell, the secondary cell, and the like) , and the user equipment needs to obtain the absolute priority of all the frequencies of the current cell. The user equipment compares the class of one or moreabsolute priorities with the class of the highest absolute priority amongall theabsolute priorities of all frequencies in the radio access network notification area of the user equipment.
S1014: user equipment detects all cells in the frequency with the highest absolute priority, whenthe absolute priority of the frequency of the current cell is lower than the highest absolute priority.
In other implementation scenarios, since the highest absolute priority among theabsolute priorities of all frequencies in the radio access network notification area of the user equipment may correspond to more than one frequency, then it is needed to detect the cells in the frequency withthe highest absolute priority.
In other implementation scenarios, when the user equipment has a plurality of current cells, the user equipment compares the class of the highest absolute priority among theabsolute priorities of the frequencies of the current cells with the class of the highest absolute priority among theabsolute priorities of all frequencies in the radio accessnetwork notification area of the user equipment. If the highest absolute priority among all the frequencies in the radio access network notification area of the user equipment is higher than the highest absolute priorityamong the absolute priority of the frequency of the current cell, then all cells at this frequency will be detected.
In other implementation scenarios, when the user equipment has a plurality of current cells, the user equipment will compare the class of all the absolute priority of the frequencies where the current cell is located, with the class ofthe highest absolute priorityamong theabsolute priorities of all frequencies in the radio access network notification area of the user equipment. If the highest absolute priorityamong theabsolute priorities of all frequencies in the radio access network notification area of the user equipment is higher than the absolute priority of any of theabsolute priorities of the frequency of the current cell, then all cells at this frequency will be detected.
S1015: user equipmentselectsa cell in the radio access network notification area among all cells in the frequency with the highest absolute priority, and measuring thequality of the cell in the radio access network notification area.
In a specific implementation scenario, after measuring the quality of the cell in the frequency with the highest absolute priority in the radio access network notification area of the user equipment, the user equipment determines whether the cells are the one in the radio access network notification area. Although the frequenciesof some cells arein the radio access network notification area, a plurality of cells can be in the same frequency, so it cannot be determined that the cells corresponding to the frequency in the radio access network notification area are all in the radio access network notification area.
The user equipment may receive the radio access network notification area configuration sent by the current base station, and obtain an explicit cell list included in the configuration. If the cell is in the explicit cell list, it indicates that the cell is in the radio access network notification area. Thus the user equipment can pick out the cell in the radio access network notification area from all cells with the highest absolute priority frequency.
In another specific implementation scenario, the system information broadcasted by the cell includes an identification (ID) of the radio access network/tracking area. User equipmentcomparesthe ID with an ID ofthe cell in the radio access network notification area configuration, if these two IDs are the same or match, the cell is in the radio access network notification area. Therefore, the user equipment can pick out the cell in the radio access network notification area from all cells with the highest absolute priority frequency.
In a specific implementation scenario, tomeasuresthe quality of a cell is to measure at least one of reference signal received power (RSRP) and reference signal received quality (RSRQ) of the cell. For example, in another implementation scenario, at least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the cell may also be measured.
S1016: user equipmentdeletesthe cell thatis a candidate cell that cannot be the reselected cell among the cell in the radio access network notification area. User equipmentsorts the remaining cells among the cell in the radio access network notification area according to the R criterion, and selectsthe cell ranked first in ranking to be the first-best cell.
In a specific implementation scenario, if a cell can not bea candidate cell of the cells that can serve as areselected cell, the cell may not serve as areselected cell, and may be deleted before each cell is sorted according to a predetermined absolute priority order, so as to reduce the workload of subsequent sorting step. The cell that can not be a candidate cell of the cells that can serve as areselected cellincludes one or morekindsof a cell indicated as "reserved for other use" , a cell indicated as "barred cell" , and a cell indicated as "reserved for theoperator use" .
The user equipment may determine whether the cell is a cell that can not be a candidate cell of the cells that can serve reselected cells. In this implementation scenario, the list of cells that can not be a candidate cell of the cells that can serve as reselected cells may be pre-stored in the user equipment. If the cell or the identification of the cell is not stored in the list of cells that can not be a candidate cell of the cells that can serve as reselected cells, the cell is not a cell that can not be a candidate cell of the cells that can serve as areselected cell. In other implementation scenarios, the criterion for determining whether thecell is a cell that can not be a candidate cell of the cells that can serve as reselected cells may be pre-stored in the user equipment, and the user equipment determines whether the cell is a cell that can not be a candidate cell of the cells that can serve as reselected cells, according to the criterion. Or special identifications may be added to the cell that can not be a candidate cell of the cells that can serve as reselected cells, and the user equipment determines whether the first-best cell is a cell that can not be a candidate cell of the cells that can serve as reselected cells, according to whether the first-best cell carries the special identification.
In a specific implementation scenario, the user equipment sorts the remaining cells according to a R criterion [TS 38.304] , that is, the user equipment sorts each remaining cell according to a specified absolute priority, specifically sorting according to following two equations.
Rs = Qmeas, s + Qhystk
Rn = Qmeas, n + Qoffset
The sorting may be performed according to Rs first, and then according to Rn when Rs is equal, or the sorting may be performed according to Rn first, and then, according to Rs when Rn is equal. After the sorting, the cell ranked first is the first-best cell. In other implementation scenarios, the sorting may also depends on one of Rs or Rn.
Herein, Qmeas, s is the RSRP measurement used in the cell reselection. For Qoffset, within the frequency: if Qoffsets, n is valid, it is equal to Qoffsets, n, otherwise it is equal to zero. For frequency spacing: if Qoffsets, n is valid, it equals to Qoffsets, n plus Qoffsetfrequency, otherwise it is equal to Qoffsetfrequency. Qoffsets, n specifies the offset between two cells, and Qoffsetfrequency is the frequency-specific offset of E-UTRAN frequency with the same absolute priority. Qhyst specifies a hysteresis value for the ranking criteria.
In other embodiments, the above steps may not be performed in the order of the embodiment. For example, the user equipment may first select cells in the radio access network notification area among all the cells in the frequency with the highest absolute priority, and then measure the quality of the cells. In this way it can reduce the number of cells that need to be measured. Alternatively, the user equipment may first select the cells in the radio access network notification area among all the cells in the frequency with the highest absolute priority, and select one or more of the top ones to measure their quality, after sorting the cells according to the R criterion, which can further reduce the number of cells that need to be measured.
S102, if the first-best cell is found, the first-best cellcanserve asreselected cell.
After finding the first-best cell, further determining on the cell is also needed to determine whether it can serve as areselected cell. Specifically, referring to FIG. 3. FIG. 3 is a flowchart diagram of the first embodiment of a method for determining whether a first-best cell can serve as areselected cell according to the present disclosure. The method for determining whether the first-best cell can be a reselected cell according to the present disclosure includes following steps.
S1021: user equipment determineswhether the quality of the first-best cellsatisfies the cell selection criteria.
In a specific implementation scenario, the user equipment compares the quality of the cell to a preset threshold. In this implementation scenario, the reference signal received power (RSRP) of the cell and reference signal received quality (RSRQ) of the cell are measured, and if the RSRP and RSRQ of the cell are both higher than a preset threshold, the quality of the cell satisfiesthe cell selection criteria. In other implementation scenarios, if one of the RSRP and the RSRQ of the cell is higher than a preset threshold, the quality of the cell satisfiesthe cell selection criteria. In another specific implementation scenario, at least one of a received signal strength indicator (RSSI) or a signal to interference noise ratio (RS-SINR) of the cell is also measured, and when the RSSI or the RS-SINR is higher than a preset threshold, the quality of the cell satisfiesthe cell selection criteria.
S1022: when the quality of the first-best cellsatisfiesthe cell selection criteria: determining whether the first-best cell belongs to a part of the “list of forbidden tracking areas for roaming” , and/orbelonging to a public land mobile network which is not indicated as being equivalent to the registered public land mobile network, and if the first-best cell is neither a part of a "list of forbidden Tracking areas for roaming" nor a public land mobile network that is the public land mobile network not indicated as equivalent to registration, then the first-best cellcan serveas a reselected cell.
In a specific implementation scenario, if the first-best cell belongs to a part of the "list of forbidden Tracking areas for roaming" or belongs to a public land mobile network (PLMN) that is the PLMN not indicated as equivalent to registration, then the first-best cell cannot serve as areselected cell.
In other implementation scenarios, it may also be performed Step S1016 to determine whether the first-best cell belongs to a part of the "list of forbidden Tracking areas for roaming" and/or belongs to a PUBLIC LAND MOBILE NETWORK that is the PLMN not indicated as equivalent to registration, to further reduce the amount of sorting workload.
In other implementation scenarios, part of the content of step S1021 and step 1022 may be reversed, that is, it may befirst determined that whether the cell is part of the "list of forbidden Tracking areas for roaming" , and/or belongs to a PLMN that is the PLMN not indicated as equivalent to registration, then the method turns to determine whether the quality of the cell satisfies the cell selection criteria.
If a suitable cell is found to be a reselected cell in step S1022, the method ends here, and if a suitable cell is not found, step S1023 is performed.
S1023: user equipmentdeletes one or more frequencies with the highest absolute priority in the candidate radio access network notification area frequency set, and performing the method of selecting the first-best cell in the foregoing description, whenthe quality of the remaining cells in the one or more frequencies with the highest absolute priority does not satisfythe cell selection criteria, or the cells belong to the "list of forbidden Tracking areas for roaming" and/or belong to the public land mobile network that is the PLMN not indicated as equivalent to registration.
In a specific implementation scenario, when the first-best cell is not suitable to be the reselected cell, step S1021 to step S1022 are sequentially performed on each cell in the sorting order in step S1016, until a suitable cell is found among the remaining cells in the one or more frequencies with the highest absolute priority to be the reselected cell. If the quality of the remaining cells in the one or more frequencies with the highest absolute priority does not satisfythe cell selection criteria, that is, there is no suitable cell found inthe one or more frequencies with the highest absolute priority to be the first-best cell, the user equipment will delete one or more frequencies with the highest absolute priority in the radio access network notification area of the user equipment in the candidate radio access network notification area frequency set. In the candidate radio access network notification area frequency set, theabsolute priority, which is second only to the highest absolute priority, is configured as the current highest absolute priority. Step S1012-step S1016 are performed again to find the first-best cell, and then step S1021-step S1022/step S1023 is performed again until a first-best cellis found to be thereselected cell.
According to the above description, the present disclosure may firstly select a suitable cell to serve as a reselected cell within the range of the radio access network notification area of the user equipment, and if it can be successfully found, it can avoid performing the RLAU operation of selecting the cells outside the radio access network notification area, thus reducing signaling overhead and power consumption, and saving resources.
Referring to FIG. 4. FIG. 4 is a schematic flowchart diagram of the second embodiment of a method for finding a first-best cell according to the present disclosure. The method for finding the first-best cell provided by the present disclosure includes the following steps.
S2011: user equipment checksthe radio access network notification area frequency list, sorting and storing all the frequencies in the radio access network notification area frequency list from high to low according to their absolute priorities, to form a candidate radio access network notification area frequency set.
S2012: user equipment checksthe candidate radio access network notification area frequency set to obtain one or more frequencies with the highest absolute priority.
S2013: user equipment comparesthe absolute priority of the frequency of the current cell with the highest absolute priority.
Step S2011-step S2013 is substantially the same as step S1011-step S1013 in the first embodiment of the method for finding the first-best cell of the present disclosure, and details are not repeated herein.
S2014, if the frequency of the current cell has the absolute priority higher than or equal to the highest absolute priority, the user equipment measuresthe quality of the current cell, and if the quality of the current cell satisfiesthe cell selection criteria, the current cell can serve as a reselected cell.
Whenthe class of the highest absolute priorityamong theabsolute priorities of all the frequencies in the radio access network notification area of the user equipment is lower than or equal to the class of the absolute priorityof the frequency of the current cell, then the user equipment measures the quality of the current cell. In this implementation scenario, it is reference signal received power (RSRP) and reference signal received quality (RSRQ) of the current cell that may be measured. In other implementation scenarios, at least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the current cell may also be measured.
If the quality of the current cell satisfies the cell selection criteria, the current cell can serve as the reselected cell. In this implementation scenario, the reference signal received power (RSRP) and the reference signal received quality (RSRQ) of the current cell are measured, if the RSRP and the RSRQ of the current cell are both higher than a preset threshold, the quality of the current cell satisfies the cell selection criteria. In other implementation scenarios, one of the RSRP and the RSRQ of the current cell may be higher than a preset threshold, and the quality of the current cell satisfies the cell selection criteria. In another specific implementation scenario, at least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the current cell is also measured, and when the RSSI Or the RS-SINR is higher than a preset threshold, the quality of the current cell satisfies the cell selection criteria.
In another specific implementation scenario, if the quality of the current cell does not satisfy the cell selection criteria, the frequency in the candidate radio access network notification area frequency list, with the absolute prioritylower than the absolute priority of the frequency of the current cell is measured. The specific measuring steps and measuring contents are as described in step S1014-step S1016 as well as step S102, and details are not described herein again.
In this implementation scenario, it is better to find a suitable cell from the cells that have the frequencywith the highest absolute priority to be the reselected cell. In other implementation scenarios, asthe absolute priority of all frequencies in the candidate radio access network notification areafrequency set is lower than the absolute priority of the frequency of the current cell, thereforecells in any one or more frequencies can be selected to get measured.
As described above, in the present embodiment, when there is no suitable cell in the radio access network notification area of the user equipment to be found to be the reselected cell, it would be better to continue communication via the current cell, thereby avoiding signaling overhead and power consumption caused by expanding the selection rangeagain. When the current cell is not suitable for continuing communication, it would be better to selects a suitable cell within the range of the radio access network notification area of the user equipment tobe the reselected cell, thus avoidingperforming the RLAU operation of selecting the cells outside the radio access network notification area, thus reducing signaling overhead and power consumption, and saving resources.
Referring to FIG. 5. FIG. 5 is a flowchart diagram of the second embodiment of a communication method provided by the present disclosure. As shown in FIG. 5, the communication method provided by the present disclosure includesfollowing steps:
S301: user equipment findsat least one first-best cell in a range of the radio access network notification area, where the first-best cellhas the quality satisfying the cell selection criteria, and a highest absolute priority among all the cells with the qualitysatisfying the cell selection criteria in the radio access network notification area.
Step S301 is substantially the same as step S101 in the first embodiment of the communication method provided by the present disclosure, and details are not described herein again.
S302, when the first-best cell is found, the first-best cellcan serve as a reselected cell, and if the first-best cell is not found, user equipment will find a second-best cell among all available cells, wherein the second-best cell has qualitysatisfying the cell selection criteria, and the second-best cell has a highest absolute priority among all the cells with the qualitysatisfying the cell selection criteria in the available cells.
When all the cells in the radio access network notification area of the user equipment are the cells withquality not satisfying the cell selection criteria or are the candidate cells that cannot be used as the reselected cell, that is, a suitable cell cannot be found in the range of the radio access network notification area of the user equipment, to serve as areselected cell. In addition, the quality of the current cell does not satisfy the cell selection criteria and cannot continue to be used. Therefore, the user equipment needs to find a suitable cell in a cell corresponding to all available frequencies outside the range of the radio access network notification area, to be a reselected cell.
Referring to FIG. 6. FIG. 6 is a schematic flowchart of an embodiment of a method for finding a second-best cell according to the present disclosure. The method for finding a second-best cell provided by the present disclosure includesfollowing steps.
S3021: user equipment checksall available frequencies, sorting and storing all the available frequencies from high to low according to their absolute priority class, to form a candidate frequency set.
In a specific implementation scenario, the user equipment checks all available frequencies, and sorts the available frequencies from high to low according to their absolute priority classes, on the basis ofpre-obtained absolute priority of different frequencies. These frequencies are stored in the sorting order to form a candidate frequency set. In other implementation scenarios, in order to facilitate subsequent step of finding the absolute priority of a certain frequency or the frequency corresponding to a certain absolute priority, it is also possible to store all available frequencies and their correspondingabsolute priorities in pairs, or all available frequencies and their correspondingabsolute priorities are stored in pairs and stored in an order from high to low or low to high according to its absolute priority class.
In another specific implementation scenario, since no suitable cell is found to be a reselected cell in the cell corresponding to the frequency in the candidate radio access network notification area frequency set, these frequencies can be directly excluded to reduce the workload of the user equipment.
S3022: user equipment checks the candidate frequency set to obtain the frequency with the highest absolute priority.
In a specific implementation scenario, the user equipment checks for one or more frequencies with the highest absolute priority in the candidate frequency set. It should be noted that a plurality of different frequencies might also have the same absolute priority. The user equipment finds the class of theabsolute priority of the one or more frequencies according to the absolute priority corresponding to the different frequencies that have been received. In other implementation scenarios, because all available frequencies and their correspondingabsolute priorities are stored in pairs, when the frequency with the highest absolute priority is found, the class of its absolute priority has been acquired. In other implementation scenarios, the user equipment may record the highest absolute priority among all theabsolute priorities when all available frequencies are sorted from high to low according to the class of their absolute priority in step S3021.
S3023: user equipment deletesa cell belonging to the candidate cell that cannot be a reselected cell among all cells at the frequency with the highest absolute priority, and/or deletesa cell outside the range of the radio access network notification area among all cells at the frequency with the highest absolute priority.
In a specific implementation scenario, if a cell is a candidate cell that cannot bea reselected cell, that is, the cell is unlikely to be a reselected cell, and the cellmay be deleted before each cell being sorted according to a specified absolute priority order, to reduce the workload of subsequent sorting process. The cell that is a candidate cell not capable to be areselected cell, includes one or more of a cellindicated as "reserved for other use" , a cell indicated as "barred cell" , and a cell indicated as "reserved for theoperator use"
The user equipment may determine whether cell can not be a candidate cell of the cells that can serve reselected cells. In this implementation scenario, the list of cells an not be a candidate cell of the cells that can serve reselected cells may be pre-stored in the user equipment. If the cell or the identification of the cell is not stored in the list of cells thatcan not be a candidate cell of the cells that can serve reselected cells, the cell is not a cell of a candidate cell that cannot serve as the reselected cell. In other implementation scenarios, the criterion for determining a cell of a candidate call that cannot be the reselected cell may be pre-stored in the user equipment, and the user equipment determines whether the cell is a cell that can not be a candidate cell of the cells that can serve reselected cells, according to the criterion. Or special identifications may be added to the cell that can not be a candidate cell of the cells that can serve reselected cells, and the user equipment determines whether the first-best cell is a candidate cell that cannot be used as the reselected cell, according to whether the first-best cell carries the special identification.
In another specific implementation scenario, since cells in the range of the candidate radio access network notification area are not suitable as reselected cells, these cells within the radio access network notification area can be directly excluded during the measuring process, asthe cells are not suitable to be reselected cells, to eliminate the workload of user equipment, thereby saving resources.
S3024: user equipment sortsthe cells according to a modified R criterion, and selecting a cell ranked first in ranking as the second-best cell.
In a specific implementation scenario, the user equipment sorts the remaining cells in the frequency with the highest absolute priority according to amodified R criterion, that is, all cells are sorted according to the defined absolute priority, specifically sorting according to following two equations.
Rs = Qmeas, s +Qhyst+ QINACTIVE
Rn = Qmeas, n + Qoffset + QINACTIVE
The sorting may be performed according to Rs first, and then according to Rn when Rs is equal, or the sorting may be performed according to Rn first, and then, according to Rs when Rn is equal. After the sorting, the cell ranked first is the second-best cell. In other implementation scenarios, the sorting may also depends on one of Rs or Rn. Herein, Qmeas, s is the RSRP measurement used in the cell reselection. For Qoffset, within the frequency: if Qoffsets, n is valid, it is equal to Qoffsets, n, otherwise it is equal to zero. For frequency spacing: if Qoffsets, n is valid, it equals to Qoffsets, nplus Qoffsetfrequency, otherwise it is equal to Qoffsetfrequency. Qoffsets, n specifies the offset between two cells, and Qoffsetfrequency is the frequency-specific offset of E-UTRAN frequency with the same absolute priority. Qhyst specifies a hysteresis value for the ranking criteria, and QINACTIVE is an additional offset.
In NR [R2-1803978] and [R2-1802931] , it is not defined whether the cell supports an inactive state of radio resource control, and therefore if at least one cell selected includes a cell that does not support the inactive state of radio resource control, when the user equipment is connected to the cell, it is needed to convert into an idle state of radio resource control, which in turn will result in higher additional power consumption.
The additional offset is configured to enable the user equipment to select a cell supporting an inactive state of the radio resource control, when the user equipment selects a cell. Each cell includes information of whether it supports the inactive state of the radio resource control in the system information, and transmits the system information to the user equipment by broadcasting. The additional offset can be either specified by the cell or by the user equipment. In this implementation scenario, if the cell specifies the additional offset, the system information broadcasted by each cell includes an additional offset QINACTIVE. In this implementation scenario, the additional offset of each cell is different. In other implementation scenarios, the user equipment may also specify the additional offset, so that each cell has the same offset and shares a common offset. The current base station transmits the common offset to the user equipment through RRCConnectionReleasemessage. Thus, the additional offsets of all cells supporting the inactive state of radio resource control are equal. In the NR network, it is not explicitly specified whether the cell needs to support the inactive state of the radio resource control, and the user equipment is likely to select a cell that does not support the inactive state of radio resource control when selecting the reselected cell. Therefore, when the user equipment receives equal or unequal additional offsets from different cells, the user equipment can increase the probability of selecting a cell supporting the inactive state of the radio resource control according to the additional offset.
In this implementation scenario, the sorting of the cell absolute prioritytakes its additional offset QINACTIVE into consideration, that is, whether the cell supports an inactive state of radio resource control is considered. The probability that the second-best cell selected in this way supports the inactive state of the radio resource control will be high.
S303: whenthe second-best cell is found, the second-best cellcan serve as the reselected cell.
After finding the second-best cell, user equipment determines on the cell is also needed to determine whether it can serve as areselected cell. Specifically, referring to FIG. 7. FIG. 7 is a flowchart diagram of the first embodiment of a method for determining whether a second-best cell can serve as areselected cell according to the present disclosure. The method for determining whether the second-best cell can be a reselected cell according to the present disclosure includes following steps.
S3031: user equipmentdetermineswhether the quality of the second-best cellsatisfies a cell selection criteria.
In a specific implementation scenario, the user equipment compares the quality of the cell to a preset threshold. In this implementation scenario, the reference signal received power (RSRP) of the cell and reference signal received quality (RSRQ) of the cell are measured, and if the RSRP and RSRQ of the cell are both higher than a preset threshold, the quality of the cell satisfies the cell selection criteria. In other implementation scenarios, if one of the RSRP and the RSRQ of the cell is higher than a preset threshold, the quality of the cell satisfies the cell selection criteria. In another specific implementation scenario, at least one of a received signal strength indicator (RSSI) or a signal to interference noise ratio (RS-SINR) of the cell is also measured, and when the RSSI or the RS-SINR is higher than a preset threshold, the quality of the cell satisfies the cell selection criteria.
S3032, when the quality of the second-best cellsatisfiesthe cell selection criteria, user equipmentdetermineswhether the second-best cell belongs to a part of the “list of forbidden Tracking areas for roaming” , and/or the belonging to a public land mobile network which is not indicated as being equivalent to the registered public land mobile network, and if the second-best cell is neither a part of a "list of forbiddentracking areas for roaming" nor a public land mobile network that is the public land mobile network not indicated as equivalent to registration, the first-best cellcan serve as a reselected cell.
In a specific implementation scenario, if the second-best cell belongs to a part of the "list of forbidden Tracking areas for roaming" or belongs to a public land mobile network (PLMN) that is the PLMN not indicated as equivalent to registration, then the second-best cell cannot serve as areselected cell.
In other implementation scenarios, part of the content of step S1021 and step 1022 may be reversed, that is, it may be determined first whether the cell is part of the "list of forbidden Tracking areas for roaming" , and/or belongs to a PLMN that is the PLMN not indicated as equivalent to registration, then determining whether the quality of the cell satisfies the cell selection criteria.
If a suitable cell is found as a reselected cell in step S3032, the method ends here, and if not, then step S3033 is performed.
S3033, when the quality of the remaining cells in the one or more frequencies with the highest absolute priority does not satisfythe cell selection criteria, or the cells belong to the "list of forbidden Tracking areas for roaming" and/or belong to a part of belonging to a public land mobile network which is not indicated as being equivalent to the registered public land mobile network, user equipmentdeletes one or more frequencies with the highest absolute priority in the candidate frequency set to get a new candidate frequency set, checking the new candidate frequency set, obtaining one or more frequencies with the highest absolute priority in the new candidate frequency set, and performing the method of selecting the second-best cell in the foregoing description.
In a specific implementation scenario, when the second-best cell is not suitable to be the reselected cell, step S3031 to step S3032 are sequentially performed on each cell in the sorting order in step S3024, until a suitable cell is found among the remaining cells in the one or more frequencies with the highest absolute priority to be the reselected cell. If the quality of the remaining cells in the one or more frequencies with the highest absolute priority does not satisfy the cell selection criteria, that is, there is no suitable cell found inthe one or more frequencies with the highest absolute priority to be the second-best cell, the user equipment will delete one or more frequencies with the highest absolute priority in the radio access network notification area of the user equipment in the candidate radio access network notification area frequency set. In the candidate radio access network notification area frequency set, theabsolute priority, which is second only to the highest absolute priority, is configured to be the current highest absolute priority. Step S3022-step S3023 are performed again to find the second-best cell, and then step S3031-step S3032/step S3033 is performed again until a second-best cellis found to be thereselected cell.
According to the above description, the present disclosure may firstly select a suitable cell as a reselected cell within the range of the radio access network notification area of the user equipment, and if it can be successfully found, it can avoid performing the RLAU operation of selecting the cells outside the radio access network notification area. When no suitable cell is found in the range of the radio access network notification area of the user equipment to be the reselected cell, the cell supporting the inactive state of the radio resource control is selected, avoiding the switch needed in selecting the cell not supporting the inactive state of the radio resource control, which can reduce signaling overhead and power consumption and save resources.
Referring to FIG. 8. FIG. 8 is a schematic flowchart diagram of the third embodiment of a communication method provided by the present disclosure. The communication method provided by the present disclosure includes the following steps.
S401, the method starts.
In a particular implementation scenario, each frequency is assigned an absolute priority. Theabsolute priorities of different frequencies will be transmitted to the user equipment by one or more method of following ways, namely, 1) in system information broadcast by the cell, 2) in the RRCConnectionRelease message sent by a current base station, and 3) by inheriting from a previous radio access technology (RAT) , during RAT cell selection (or reselection) . In other implementation scenarios, the absolute priority of each frequency may be sent to the user equipment by other methods, for example, by pre-defining the absolute priority of each frequency in the user equipment, and the like.
A radio access network notification area frequency list includes all frequencies in the range of the radio access network notification area of the user equipment and theirabsolute priorities. The current base station connected to the user equipment sends the radio access network notification area frequency list to the user equipment through RRCConnectionReleasemessage.
An additional offset is configured to enable the user equipment to select a cell supporting an inactive state of the radio resource control when the user equipment selects a cell. Each cell includes information of whether it supports the inactive state of the radio resource control in the system information, and transmits the system information to the user equipment by broadcasting. The additional offset can be either specified by the cell or by the user equipment. In this implementation scenario, if the cell specifies the additional offset, the system information broadcasted by each cell includes an additional offset QINACTIVE. In this implementation scenario, the additional offset of each cell is different. In other implementation scenarios, the user equipment may also specify the additional offset, so that each cell has the same offset and shares a common offset. The current base station sends the common offset to the user equipment through RRCConnectionReleasemessage. Thus, the additional offsets of all cells supporting the inactive state of radio resource control are equal. In the NR network, it is not explicitly specified whether the cell needs to support the inactive state of the radio resource control, and the user equipment is likely to select a cell that does not support the inactive state of radio resource control when selecting the reselected cell. Therefore, when the user equipment receives equal or unequal additional offsets from different cells, the user equipment can increase the probability of selecting a cell supporting the inactive state of the radio resource control according to the additional offset.
The user equipment receives and stores parameters and lists needed for the communication method, such as absolute priority of frequency, radio access network notification area frequency list, and additional offset, etc.
S402: user equipmentchecksthe radio access network notification area frequency list, and sorting and storing all the frequencies in the radio access network notification area frequency list according to their absolute priority class from high to low, to form a candidate radio access network notification area frequency set.
In a specific implementation scenario, the user equipment checks the radio access network notification area frequency list sent by the current base station, and obtaining all the frequencies in the range of the radio access network notification area of the user equipment. Based on the pre-receivedabsolute priorities of different frequencies, the user equipment sorts the frequencies from high to low according to theirabsolute priorities and store the sorted frequencies to form a candidate frequency set of the access network notification area.
In other implementation scenarios, in order to facilitate a subsequent checking on the absolute priority of a certain frequency or the frequency corresponding to a certain absolute priority, all frequencies in the radio access network notification area of the user equipment and the correspondingabsolute priorities are stored in pairs, or stored in pairs and in order of from high to low or from low to high according to their absolute priority class to form a candidate frequency set of the radio access network notification area.
S403: user equipmentchecksthe candidate radio access network notification area frequency set to obtain one or more frequencies with the highest absolute priority.
In a specific implementation scenario, the user equipment checks one or more frequencies with the highest absolute priorityin the frequency set of the candidate radio access network notification area. It should be noted that there might be a plurality of different frequencies that have the same absolute priority. The user equipment finds the absolute priority class of the one or more frequencies according to the absolute priority corresponding to the different frequencies that have been received. In other implementation scenarios, since all frequencies in the radio access network notification area of the user equipment and their correspondingabsolute priorities are stored in pairs, therefore when the frequency with the highest absolute priority is found, the absolute priorityclass of the frequency has already been obtained. In other implementation scenarios, Step S1011, the user equipment may record the highest absolute priority in theabsolute priorities, when all the frequencies in the radio access network notification area of the user equipment according to their absolute priority class are sorted from high to low.
S404: user equipmentdetermineswhether the highest absolute priority is higher than the absolute priority of the frequency of the current cell.
In a specific implementation scenario, the user equipment checks the absolute priority class of the frequency of the current cell, and compares that class with the class of the highest absolute priority among all theabsolute priorities of all frequencies in the radio access network notification area of the user equipment. It should be noted that the user equipment may have multiple current cells (including a master cell, the secondary cell, and the like) , and the user equipment needs to obtain the absolute priority of all the frequencies of the current cell. The user equipment compares the class of one or moreabsolute priorities with the class of the highest absolute priority amongall theabsolute priorities of all frequencies in the radio access network notification area of the user equipment.
In other implementation scenarios, when the user equipment has a plurality of current cells, the user equipment compares the class of the highest absolute priority among theabsolute priorities of the frequencies of the current cells with the class of the highest absolute priority among theabsolute priorities of all frequencies in the radio accessnetwork notification area of the user equipment. If the highest absolute priority among all the frequencies in the radio access network notification area of the user equipment is higher than the highest absolute priorityamong the absolute priority of the frequency of the current cell, then all cells at this frequency will be detected.
In other implementation scenarios, when the user equipment has a plurality of current cells, the user equipment will compare the class of all the absolute priority of the frequencies where the current cell is located, with the class of the highest absolute priorityamong theabsolute priorities of all frequencies in the radio access network notification area of the user equipment. If the highest absolute priorityamong theabsolute priorities of all frequencies in the radio access network notification area of the user equipment is higher than the absolute priority of any of theabsolute priorities of the frequency of the current cell, then all cells at this frequency will be detected.
If the highest absolute priority is higher than the absolute priority of the frequency of the current cell, step S405 is performed; otherwise, step S406 is performed.
S405: user equipmentdetectsall cells in the frequency with the highest absolute priority.
If the highest absolute priority is higher than the absolute priority of the frequency of the current cell, then all cells at the frequency with the highest absolute priority will be detected.
In other implementation scenarios, since the highest absolute priority among theabsolute priorities of all frequencies in the radio access network notification area of the user equipment may correspond to more than one frequency, then during the measuring operation, it is needed to detect the quality of all cells in the frequency withthe highest absolute priority.
S406: user equipmentdetermineswhether quality of the current cell satisfies a cell selection criteria.
In a specific implementation scenario, if the class of the highest absolute priority among theabsolute priorities of all the frequencies in the radio access network notification area of the user equipment is lower than or equal to the class of the absolute priorityof the frequency of the current cell, then the user equipment measures the quality of the current cell. In this implementation scenario, it is reference signal received power (RSRP) and reference signal received quality (RSRQ) of the current cell that may be measured. In other implementation scenarios, at least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the current cell may also be measured.
If the quality of the current cell satisfies the cell selection criteria, step S407 is performed; otherwise, step S408 is performed.
S407: user equipmentstops the measurement, and continuing to regard the current cell as the reselected cell.
In a specific implementation scenario, the current cell can serve as thereselected cell. Since the suitable cell has been found to continue communication, there is no need to measure other cells, and the measurement process can be stopped. In this implementation scenario, the reference signal received power (RSRP) and the reference signal received quality (RSRQ) of the current cell are measured, if the RSRP and the RSRQ of the current cell are both higher than a preset threshold, the quality of the current cell satisfies the cell selection criteria. In other implementation scenarios, one of the RSRP and the RSRQ of the current cell may be higher than a preset threshold, and the quality of the current cell satisfies the cell selection criteria. In another specific implementation scenario, at least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the current cell is also measured, and when the RSSI or the RS-SINR is higher than a preset threshold, the quality of the current cell satisfies the cell selection criteria.
S408: user equipmentmeasures the quality of all cells with the absolute priority lower than the frequency of the current cell.
In a specific implementation scenario, if the quality of the current cell does not satisfy the cell selection criteria, the frequency in the candidate radio access network notification area frequency list, with an absolute priority lower than the absolute priority of the frequency of the current cell, is measured. As describedStep 405, the quality at the frequency with the highest absolute priority may be measured. Since the absolute priority of all frequencies is lower than the absolute priority of the frequency of the current cell, the quality of any absolute priority frequency can also be measured.
S409: user equipmentselectsa cell within the radio access network notification area among all cells in the frequency with the highest absolute priority, and measuring thequality of the cell in the radio access network notification area.
In a specific implementation scenario, after measuring the quality of the cell in the frequency with the highest absolute priority in the radio access network notification area of the user equipment, the user equipment determines whether the cells are the one in the radio access network notification area. Although the frequency of some cells is in the radio access network notification area, a plurality of cells can be in the same frequency, so it cannot be determined that the cells corresponding to the frequency in the radio access network notification area are all in the radio access network notification area.
The user equipment may receive the radio access network notification area configuration sent by the current base station, and obtain an explicit cell list included in the configuration. If the cell is in the explicit cell list, it indicates that the cell is in the radio access network notification area. Thus the user equipment can pick out the cell in the radio access network notification area from all cells with the highest absolute priority frequency.
In another specific implementation scenario, the system information broadcasted by the cell includes an identification (ID) of the radio access network/tracking area. Comparing the ID with an ID ofthe cell in the radio access network notification area configuration, if these two IDs are the same or match, the cell is in the radio access network notification area. Therefore, the user equipment can pick out the cell in the radio access network notification area from all cells with the highest absolute priority frequency.
In a specific implementation scenario, measuring the quality of a cell is to measure at least one of reference signal received power (RSRP) and reference signal received quality (RSRQ) of the cell. For example, in another implementation scenario, at least one of areceived signal strength indicator (RSSI) or asignal to interference noise ratio (RS-SINR) of the cell may also be measured.
S410: user equipmentdeletesthe cell can not be a candidate cell of the cells that can serve as areselected cell among the cells in the radio access network notification area, and sorting remaining cells among the cells in the radio access network notification area according to a R criterion, and selecting the cell ranked first in the ranking as the first-best cell.
In a specific implementation scenario, if a cell is a candidate cell that cannot serve as areselected cell, the cell may not serve as areselected cell, and may be deleted before each cell is sorted according to a predetermined absolute priority order, so as to reduce the workload of subsequent sorting step. The cell that is a candidate cell not capable to be areselected cell, includes one or more or a cell indicated as "reserved for other use" , a cell indicated as "barred cell" , and a cell indicated as "reserved for theoperator use" .
The user equipment may determine whether the cell is a cell can not be a candidate cell of the reselected cell. In this implementation scenario, the list of cells of the candidate cell that cannot be the reselected cell may be pre-stored in the user equipment. If the cell or the identification of the cell is not stored in the list of cells of the candidate cell that cannot be the reselected cell, the cell is not a cell of a candidate cell that cannot serve as the reselected cell. In other implementation scenarios, the criterion for determining a cell is the cell that can not be a candidate cell of the cells that can serve as areselected cellmay be pre-stored in the user equipment, and the user equipment determines whether the cell is a cellthat can not be a candidate cell of the cells that can serve as areselected cell, according to the criterion. Or special identifications may be added to the cell that can not be a candidate cell of the cells that can serve as areselected cell, and the user equipment determines whether the first-best cell is a candidate cell that cannot be used as the reselected cell, according to whether the first-best cell carries the special identification.
In a specific implementation scenario, the user equipment sorts the remaining cells according to a R criterion [TS 38.304] , that is, sorts each remaining cell according to a specified absolute priority, specifically sorting according to following two equations.
Rs = Qmeas, s + Qhyst
Rn = Qmeas, n + Qoffset
The sorting may be performed according to Rs first, and then according to Rn when Rs is equal, or the sorting may be performed according to Rn first, and then, according to Rs when Rn is equal. After the sorting, the cell ranked first is the first-best cell. In other implementation scenarios, the sorting may also depends on one of Rs or Rn. Herein, Qmeas, s is the RSRP measurement used in the cell reselection. For Qoffset, within the frequency: if Qoffsets, n is valid, it is equal to Qoffsets, n, otherwise it is equal to zero. For frequency spacing: if Qoffsets, n is valid, it equals to Qoffsets, n plus Qoffsetfrequency, otherwise it is equal to Qoffsetfrequency. Qoffsets, n specifies the offset between two cells, and Qoffsetfrequency is the frequency-specific offset of E-UTRAN frequency with the same absolute priority. Qhyst specifies a hysteresis value for the ranking criteria.
S411: user equipmentdetermineswhether the quality of the first-best cell is higher than a threshold, and determining whether the first-best cell belongs to a part of a “list of forbidden Tracking areas for roaming” , and/or belong to a public land mobile network that is the public land mobile network not indicated as equivalent to registration.
In a specific implementation scenario, the user equipment compares the quality of the cell to a preset threshold. In this implementation scenario, the reference signal received power (RSRP) of the cell and reference signal received quality (RSRQ) of the cell are measured, and if the RSRP and RSRQ of the cell are both higher than a preset threshold, the quality of the cell satisfies the cell selection criteria. In other implementation scenarios, if one of the RSRP and the RSRQ of the cell is higher than a preset threshold, the quality of the cell satisfies the cell selection criteria. In another specific implementation scenario, at least one of a received signal strength indicator (RSSI) or a signal to interference noise ratio (RS-SINR) of the cell is also measured, and when the RSSI or the RS-SINR is higher than a preset threshold, the quality of the cell satisfies the cell selection criteria.
In a specific implementation scenario, if the first-best cell belongs to a part of the "list of forbiddentracking areas for roaming" or belongs to a public land mobile network (PLMN) that is the PLMN not indicated as equivalent to registration, then the first-best cell cannot serve as areselected cell.
In other implementation scenarios, it may also be performed in step S1016 to determine whether the first-best cell belongs to a part of the "list of forbidden tracking areas for roaming" and/or belongs to a PLMN that is the PLMN not indicated as equivalent to registration, to further reduce the amount of sorting workload.
If the quality of the cell satisfies the cell selection criteria and the cell belongs to neither a part of a "list of forbidden tracking areas for roaming" nor a public land mobile network that is the public land mobile network not indicated as equivalent to registration, then in step S412, the first-best cellcan serve as the reselected cell, and the process ends. If the quality of the cell does not satisfy the cell selection criteria or the cell belongs to a part of a "list of forbidden tracking areas for roaming" or a public land mobile network that is the public land mobile network not indicated as equivalent to registration, then the step S413 is performed.
S413: user equipment deletesthe frequency of the first-best cell in the candidate radio access network notification area frequency set.
In a specific implementation scenario, the user equipment will delete the frequency of the first-best cell in the candidate radio access network notification area frequency set. In another implementation scenario, the user equipment may delete one or more frequencies with the highest absolute priority within the radio access network notification area of the user equipment.
S414: user equipment determines whether the candidate radio access network notification area frequency set is empty.
After deleting the frequency of the first-best cell, determining whether there is still a remaining frequency in the candidate radio access network notification areafrequency set, and if yes: executing step S403 of selecting ansuitable cell from the remaining cells corresponding to the frequency to be thereselected cell, and if not, step S415 is performed.
S415: user equipment performsbaseline cell reselection based on the absolute priority and a modified R criterion.
Step S415 is similar to step S302-S303 of the communication method provided by the present disclosure, and details are not described herein again.
According to the above description, the present disclosure may firstly select a suitable cell as a reselected cell within the range of the radio access network notification area of the user equipment, and if it can be successfully found, it can avoid performing the RLAU operation of selecting the cells outside the radio access network notification area. When no suitable cell is found in the range of the radio access network notification area of the user equipment to be the reselected cell, the cell supporting the inactive state of the radio resource control is selected, avoiding the switch needed in selecting the cell not supporting the inactive state of the radio resource control, which can reduce signaling overhead and power consumption, thus saving resources.
Referring to FIG. 9. FIG. 9 is a structural view of an embodiment of a testing device according to the present disclosure. As shown in FIG. 9, the user equipment 10 includes a processor 11, a communication circuit 12, and a storage circuit 13. The processor 11 is connected to the communication circuit 12 and the storage circuit 13.
In one implementation scenario, the storage circuit 13 is configured to store parameters and lists required to perform the communication method, such as absolute priority of frequency, radio access network notification area frequency list, and additional offsets, etc.
The processor 11 controls the communication circuit 12 to realize selection of a suitable cell within the range of the radio access network notification area of the user equipment 10 to be a reselected cell. If all cells in the radio access network notification area are not suitable to be the reselected cell, and the quality of the current cell does not satisfythe cell selection criteria, the processor 11 controls the communication circuit 12 to firstly select the cell supporting the inactive state of radio resources control to be the reselected cell.
The specific process of the processor 11 to realize the foregoing functions may refer to the foregoing embodiments of methods.
According to the foregoing description, in the present embodiment, the processor is coupled to the communication circuit and the storage circuit to realize firstly selecting a suitable cell in the radio access network notification area to be the reselected cell, which can reduce signaling overhead and power consumption. In addition, when a cell outside the range of the radio access network notification area is selected to be the reselected cell, the cell that supports the inactive state of the radio resource control is tended to get selected to be the reselected cell, which can further reduce the signaling overhead and power consumption caused by switch, thereby saving resources.
Referring to FIG. 10. FIG. 10 is a schematic structural diagram of andevice with a storage function in the present disclosure. The device 20 with the storage function stores at least one program data 21, the program data 21 configured to execute the automatic testing method as shown in any one of FIGs. 1 -8. In one embodiment, the device with the storage function may be a storage chip or a hard disk in a terminal, a removable hard disk, or be other readable, writeable, and storable device such as a USB flash drive and an optical disk, and may also be a server or the like.
As described above, in this embodiment, the program data stored in the device of the embodiment with the storage function in this embodiment can be used to select a suitable cell to be the reselected cell, which may save resources.
Different from the prior art, the present disclosure firstly selects a suitable cell among cells within the radio access network notification area of the user equipment to be the reselected cell, thus avoiding signaling overhead and power consumption caused by the RLAU operation when selecting a cell outside the range of the radio access network notification area, thereby saving resources. When all cells in the range of the radio access network notification area of the user equipmentare not suitable to be the reselected cell, and the quality of the current cell does not satisfythe cell selection criteria and cannot continue to use, the cell supporting the inactive state of the radio resource control is tended to get selected to be the reselected cell, avoiding signaling overhead and power consumption caused by the switchneeded in selecting the cell not supporting the inactive state of the radio resource control, thus saving resources.
The above description merely illustrates some exemplary embodiments of the disclosure, which however are not intended to limit the scope of the disclosure to these specific embodiments. Any equivalent structural or flow modifications or transformations made to the disclosure, or any direct or indirect applications of the disclosure on any other related fields, shall all fall in the scope of the disclosure.
Claims (22)
- A communication method, comprising:finding at least one first-best cell in a range of a radio access network notification area, where the first-best cell has qualitysatisfiescell selection criteria, and hasthehighest absolute priority among all the cells that satisfythe cell selection criteria in the radio access network notification area;making the first-best cellserve as a reselected cell, whenthe first-best cell is found; otherwisesearch for a second-best cell among all available cells; wherein the second-best cellsatisfiesthe cell selection criteria, and hasthehighest absolute priority among all the cells satisfy the cell selection criteria in all available cells; andmaking the second-best cellserve as the reselected cell, when the second-best cell is found.
- The method according to claim 1, wherein the finding the at least one first-best cell in the range of the radio access network notification area comprises:receiving a radio access network notification area frequency list sent by a current base station, and obtaining theabsolute priorities corresponding to all frequencies.
- The method according to claim 2, wherein the obtainingtheabsolute priorities corresponding to all the frequencies comprises:receiving system information broadcasted by the cells, the system information includingtheabsolute priorities corresponding to all the frequencies, and/or;receiving a radio resource control connection release messagetransmitted by the current base station, wherein the radio resource control connection release message includes theabsolute priorities corresponding to all frequencies, and/or;inheriting theabsolute priorities corresponding to the all frequencies included in a previous radio access technology.
- The method according to claim 3, wherein the finding the at least one first-best cell in the range of the radio access network notification area comprises:checking the radio access network notification area frequency list, and storing the frequencies in the radio access network notification area frequency list from high to low according to the absolute priorityto form a candidate frequency set of the access network notification area; andchecking the candidate frequency set of the radio access network notification area to obtain one or more frequencies with the highest absolute priority; and selecting at least one suitable cell to be the first-best cell, fromthe cells in one or more frequencies with the highest absolute priority.
- The method according to claim 4, wherein the selecting at least one suitable cell fromthe cells in one or more frequencies with the highest absolute priorityto be the first-best cell, comprises:comparing the absolute priority of the frequency of the current cell with the highest absolute priority; anddetecting all cells in the frequency with the highest absolute priority, whenthe absolute frequency of the frequency of the current cell is lower than the highest absolute priority, and selecting at least one suitable cell to be the first-best cellfrom all the cells in the frequency with the highest absolute priority.
- The method of claim 5, whereinthe selecting at least one suitable cell among the cells in one or more frequencies with the highest absolute priorityto be the first-best cell, comprises:selecting a cell in the radio access network notification area among all cells in the frequency withthe highest absolute priority, and measuring quality of the cell in the radio access network notification area; anddeleting the cell which is a candidate cell that cannot be the reselected cellfromthe cells in the radio access network notification area, sorting remaining cells fromthe cells in the radio access network notification area according to a R criterion, and selecting the cell ranked first in ranking to be the first-best cell; whereinthe cell which is thecandidate cell that cannot be areselected cellcomprises:a cell indicated as "reserved for other use"; and/ora cell indicated as "barred cell"; and/ora cell indicated as "reserved for operator use".
- The method according to claim 4, wherein the selecting at least one suitable cell among the cells in one or more frequencies with the highest absolute priorityto be the first-best cell, further comprises:measuring the quality of the current cell, when the frequency of the current cell has the absolute priority higher than or equal to the highest absolute priority; and the current cell serve as a reselected cell, when the quality of the current cell satisfies the cell selection criteria.
- The method according to claim 7, wherein the selecting at least one suitable cell among the cells in one or more frequencies with the highest absolute priorityto be the first-best cell, further comprises:executing the method of claim 6 to find the first-best cell, when the quality of the current cell does not satisfy the cell selection criteria.
- The method according to claim 1, wherein, when the second-best cell is found, makethe second-best cellserve as the reselected cell, comprise:determining whether the quality of the first-best cellsatisfiesthe cell selection criteria;determining whether the first-best cell belongs to a part of a “list of forbidden tracking areas for roaming” , and/or belonging to a public land mobile network which is not indicated as being equivalent to the registered public land mobile network, when the quality of the first-best cellsatisfies the cell selection criteria; andmaking the first-best cellserve as a reselected cell, when the first-best cell is neither a part of the "list of forbidden tracking areas for roaming"nor belonging to a public land mobile network which is not indicated as being equivalent to the registered public land mobile network.
- the method according to claim 9, wherein making the first-best cellserve as a reselected cellwhen the first-best cell is found, further comprises:deleting one or more frequencies with the highest absolute priority in the candidate radio access network notification area frequency set, when the quality of the remaining cells in the one or more frequencies withthe highest absolute priority does not satisfy the cell selection criteria; andregarding thecandidate radio access network notification area frequency setwhich hasdeletedone or more frequencies with the highest absolute priority in the candidate radio access network notification area frequency setasa new candidate radio access network notification area frequency set, checking the new candidate frequency set, obtaining one or more frequencies withthe highest absolute priority in the new candidateradio access network notification area frequency set, and executing the method of claim 5 -claim 9.
- The method according to claim 1, wherein finding thesecond-best cell among all available cells, whenthe first-best cell is not found, comprises:checking all available frequencies, sorting and storing all of the available frequencies from high to low according to their absolute priority class to form a candidate frequency set;checking the candidate frequency set to obtain a frequency withthe highest absolute priority; andselecting at least one cell of all cells in the frequency with the highest absolute priorityto be the at least one second-best cell.
- The method according to claim 11, wherein the selecting at least one cell of all cells in the frequency with the highest absolute priorityto be the at least one second-best cell, comprises:deleting the cell belonging to a candidate cell not being able to be the reselected cell among the cellsin the frequency with the highest absolute priorityin the radio access network notification area; and/ordeleting the cell within the range of the radio access network notification area in all cells in the frequency with the highest absolute priority; whereinthe cell which is thecandidate cell that cannot be areselected cellcomprises:a cell indicated as "reserved for other use"; and/ora cell indicated as "barred cell"; and/ora cell indicated as "reserved for the operator use".
- The method according to claim 12, wherein the selecting at least one cell of all cells in the frequency with the highest absolute priorityto be the at least one second-best cell, further comprises:sorting the cellswhich have deleted the cell within the range of the radio access network notification area in all cells in the frequency with the highest absolute priorityin the frequency with the highest absolute priority according to a modified R criterion, and selecting the cell ranked first in ranking to be the second-best cell.
- The method according to claim 13, wherein the sorting the cells after deleting in the frequency with the highest absolute priority according to the modified R criterion, comprises:obtaining an additional offset of each cell that supports an inactive state of radio resource control.
- The method according to claim 14, wherein the additional offset is specified by the cell, and the obtaining an additional offset of each cell that supports theinactive state of radio resource controlcomprises:receiving system information broadcast by the cell, the system information including the additional offset.
- The method of claim 14, wherein thecurrent base station specifies the additional offset, the obtaining an additional offset of each cell that supports theinactive state of radio resource control comprises:receiving a radio resource control connection release message sent by the current base station, the radio resource control connection release message including the additional offset.
- The method according to claim 16, wherein the additional offset is specified by the current base station, and the obtaining the additional offset of each cell that supports an inactive state of radio resource control, further comprises:ignoring the additional offset included in the system information, when the additional offset included in the system information is different from the additional offset included in the radio resource control connection release message.
- The method according to claim 1, whereinmaking the second-best cellserveas a reselected cellwhen the second-best cell is found, comprises:determining whether the quality of the second-best cellsatisfies the cell selection criteria,determining whether the second-best cellis a part of a “list of forbidden Tracking areas for roaming” , and/or belonging to a PUBLIC LAND MOBILE NETWORK which is not indicated as being equivalent to the registered PUBLIC LAND MOBILE NETWORK, when the quality of the second-best cellsatisfiesthe cell selection criteria; andmaking the second-best cellserve as a reselected cell, when thesecond-best cell is neither a part of the "list of forbidden Tracking areas for roaming"nor belonging to a PUBLIC LAND MOBILE NETWORK which is not indicated as being equivalent to the registered PUBLIC LAND MOBILE NETWORK.
- The method according to claim 18, wherein when the second-best cell is found, making the second-best cellserve as a reselected cell, further comprises:Deletingone or more frequencies with the highest absolute priority in the candidate frequency set to get a new candidate frequency set, when the quality of the remaining cells in the one or more frequencies with the highest absolute priority does not satisfythe cell selection criteria, or the cells belong to the "list of forbidden Tracking areas for roaming"and/or belong to a part of belonging to a PUBLIC LAND MOBILE NETWORK which is not indicated as being equivalent to the registered PUBLIC LAND MOBILE NETWORK; checking the new candidate frequency set, obtaining one or more frequencies with the highest absolute priority in the new candidate frequency set, and executing the method of claim 12 -claim 18.
- A method according to any one of claims 1-19, whereinthe quality includes: at least one of a reference signalreceived powerof the cell and a reference signal received quality of the cell;the qualitysatisfies the cell selection criteria, includes:at least one of a reference signalreceived power of the cell and a reference signal received qualityof the cell, is higher than a preset threshold; andthe quality not satisfying the cell selection criteria, includes:at least one of the reference signalreceived powerof the cell and the reference signal received qualityof the cell, is lower than or equal to a preset threshold.
- A user equipment, comprising: a processor, a communication circuit and a storage unit, which are allconnected to each other, , to implement any one of the method in claims 1-19.
- A device with storage function, whereinthe device stores, which can be executed to achievethe procedure mentioned in any one of claims 1-19.
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