CN118055464A - Method and device for RedCap terminal to select 4G cell based on historical data - Google Patents

Method and device for RedCap terminal to select 4G cell based on historical data Download PDF

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Publication number
CN118055464A
CN118055464A CN202410139879.1A CN202410139879A CN118055464A CN 118055464 A CN118055464 A CN 118055464A CN 202410139879 A CN202410139879 A CN 202410139879A CN 118055464 A CN118055464 A CN 118055464A
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China
Prior art keywords
cell
redcap
terminal
unfriendly
redcap terminal
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Chinese (zh)
Inventor
龙迪
李维成
朱仕轶
冯子龙
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ASR Microelectronics Co Ltd
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ASR Microelectronics Co Ltd
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Priority to CN202410139879.1A priority Critical patent/CN118055464A/en
Publication of CN118055464A publication Critical patent/CN118055464A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a method for a RedCap terminal to select a 4G cell based on historical data, which comprises the following steps. Step S1: and RedCap, when the terminal works in the 4G service cell each time, according to whether all 5G neighbor cells of the 4G cell are 5G cells which reject RedCap terminal access, correspondingly judging the 4G cell as an unfriendly 4G cell or a friendly 4G cell. Step S2: when the RedCap terminal works in the 5G service cell subsequently, a cellReselctionPriority field is contained in a system information block five SIB5 issued by the network to indicate the priority of a target frequency point; the RedCap terminal reduces the priority of the unfriendly 4G cell described therein. Or step S2 is changed to step S3: and when the RedCap terminal works in the 4G service cell subsequently, reducing the R value of the unfriendly 4G cell or improving the reporting threshold of the measurement event of the unfriendly 4G neighbor cell. The invention reduces the probability of RedCap terminal accessing unfriendly 4G cell, thereby improving the success rate of smoothly returning to 5G cell allowing RedCap terminal to access after RedCap terminal enters 4G cell.

Description

Method and device for RedCap terminal to select 4G cell based on historical data
Technical Field
The invention relates to a mobile communication technology, in particular to a method for improving the success rate of RedCap terminals accessing to 5G cells.
Background
Compared with the 4G mobile communication network, the 5G mobile communication network has the functions and advantages of larger bandwidth, faster uplink and downlink rates, 5G network slicing (network slicing) and the like. The 3gpp r17 protocol introduced RedCap (reduced capability ) features, and mobile terminals are therefore divided into two types: a RedCap capable mobile terminal is referred to as RedCap terminal and a mobile terminal without RedCap capability. The 5G cells are also divided into two types: a 5G cell that allows RedCap terminal access, a 5G cell that denies RedCap terminal access. This partitioning of 5G cells takes into account both whether or not the 5G cells support RedCap features and the configuration of the 5G cells, e.g., 5G cells supporting RedCap features may be configured to reject RedCap terminal access.
Currently, the gsm networks are still mainly 4G, so RedCap terminals are also required to have 4G connection capability. According to the existing 3GPP protocol, the 4G mobile communication network cannot know whether the mobile terminal has RedCap capability, so that the 4G mobile communication network may redirect the RedCap terminal to a 5G cell which refuses the access of the RedCap terminal in a different system, which may cause abnormal and ping-pong handover situations when the RedCap terminal accesses such 5G cell, and affect the continuity of the mobile terminal service and the user experience.
Disclosure of Invention
The technical problem to be solved by the invention is how to improve the success rate of RedCap terminals accessing 5G cells in a different system reselection mode, a different system redirection mode or a different system switching mode.
In order to solve the technical problems, the invention provides a method for a RedCap terminal to select a 4G cell based on historical data, which comprises the following steps. Step S1: each time the RedCap terminal operates in a 4G serving cell, it is detected whether all 5G neighbors of the 4G cell allow or deny RedCap terminal access. If all 5G neighbor cells of the 4G cell are 5G cells which reject RedCap terminal access, the 4G cell is judged to be an unfriendly 4G cell; if at least one 5G neighbor of the 4G cell is a 5G cell that allows RedCap terminals to access, the 4G cell is determined to be a friendly 4G cell. Step S2: when the RedCap terminal works in the 5G service cell subsequently, a cellReselctionPriority field is contained in a system information block five SIB5 issued by the network to indicate the priority of a target frequency point; the RedCap terminal reduces the priority of the unfriendly 4G cell described in the cellReselctionPriority field. This is the first embodiment of the proposed method of the present invention.
Further, an example of the step S1 specifically includes the following substeps. Substep S11a: redCap the terminal currently receives the SIB24 message sent by the 4G LTE cell in the 4G LTE cell, where the SIB24 message carries 5G frequency point information. Substep S12a: the RedCap terminal searches 5G NR cells meeting the requirements in each 5G frequency point and reads SIB1 information of each 5G NR cell; and judging whether each 5G NR cell allows RedCap terminals to access or denies RedCap terminals to access according to the SIB1 message. Substep S13a: if the RedCap G NR cells searched by the terminal according to all 5G frequency points in the SIB24 message issued by the 4G LTE cell are 5G cells which are refused to be accessed by the RedCap terminal, the 4G LTE cell is an unfriendly 4G cell; otherwise, the 4G LTE cell is a friendly 4G cell.
Further, example two of the step S1 specifically includes the following substeps. Substep S11b: redCap the terminal currently receives RRCRELEASE message sent by the 4G LTE cell in the 4G LTE cell, where the RRCRELEASE message includes 5G frequency point information. Substep S12b: the RedCap terminal searches 5G NR cells meeting the requirements in each 5G frequency point and reads SIB1 information of each 5G NR cell; and judging whether each 5G NR cell allows RedCap terminals to access or denies RedCap terminals to access according to the SIB1 message. Substep S13b: if the RedCap G NR cells searched by the terminal according to all 5G frequency points in RRCRELEASE messages issued by the 4G LTE cell are 5G cells which are refused to be accessed by the RedCap terminal, the 4G LTE cell is an unfriendly 4G cell; otherwise, the 4G LTE cell is a friendly 4G cell.
Further, the third embodiment of the step S1 specifically includes the following substeps. Substep S11c: redCap the terminal currently receives a mobile from the 4G LTE cell, and the mobile from the 4G LTE cell carries a RRCReconfiguraion message indicating a 5G NR target cell. Substep S12c: the RedCap terminal judges whether the 5G NR target cell allows RedCap access or refuses RedCap terminal access according to whether the RRCReconfiguraion message contains initialDownlinkBWP-RedCap-r17 fields. If included, the 5G NR target cell is said to allow RedCap terminals access, then the 4G LTE cell is a friendly 4G cell. If not, the 5G NR target cell refuses RedCap the terminal access and continues to the next step. Substep S13c: the RedCap terminal searches 5G NR cells and reads SIB1 information of each 5G NR cell; and judging whether each 5G NR cell allows RedCap terminals to access or denies RedCap terminals to access according to the SIB1 message. Substep S14c: if all 5G NR cells searched by the RedCap G terminal are 5G cells which are refused to be accessed by the RedCap terminal, the 4G LTE cell is an unfriendly 4G cell; otherwise, the 4G LTE cell is a friendly 4G cell.
Further, in the substep S12a, the substep S12b and the substep S13c, for the RedCap terminal with a single transmitting antenna, if the intraFreqReseletionRedCap-r17 parameter in the SIB1 message is allowed and the cellBarredRedCap Rx-r17 parameter in the SIB1 message is not forbidden, it indicates that the 5G NR cell allows RedCap terminal access; otherwise, the 5G NR cell refuses RedCap terminal access. For RedCap terminals with double transmitting antennas, if intraFreqReseletionRedCap-r17 parameters in the SIB1 message are allowed and cellBarredRedCap Rx-r17 parameters in the SIB1 message are not forbidden, the 5G NR cell is allowed to be accessed to RedCap terminals; otherwise, the 5G NR cell refuses RedCap terminal access.
Further, in the step S1, when RedCap terminal determines that the 4G cell is not friendly 4G cell, a degradation timer is started; after expiration of the timing of the downgrade timer, the RedCap terminal cancels the conclusion that the 4G cell is determined to be an unfriendly 4G cell; in the step S2, before the expiration of the timing of the degradation timer, the RedCap terminal decreases the priority of the 4G cell; after expiration of the downgrade timer, the RedCap terminal cancels the reduction of the priority of the 4G cell.
Alternatively, the step S2 is changed to a step S3; the step S3 is as follows: when the RedCap terminal works in the 4G service cell subsequently, the R value of the unfriendly 4G cell is reduced in the intra-system reselection scene, or the reporting threshold of the measurement event of the unfriendly 4G neighbor cell is improved in the intra-system handover scene. This is the second embodiment of the proposed method of the present invention.
Further, an example one of the step S3 is: when the RedCap terminal works in the 4G LTE cell subsequently, calculating the R values of the current service cell and the neighbor cell by using a cell reselection R criterion in a intra-system reselection scene, subtracting the newly added first parameter from the R value of the unfriendly 4G cell, namely reducing the R value of the unfriendly 4G cell.
Further, the second example of the step S3 is: when the RedCap terminal works in the 4G LTE cell subsequently, adding a newly added second parameter as an additional threshold to the condition of reporting the A3 event measurement result of the unfriendly 4G neighbor cell in the intra-system handover scene, namely, improving the measurement event reporting threshold of the unfriendly 4G cell.
The invention also provides a device for selecting the 4G cell by the RedCap terminal based on the historical data, which comprises a detection judging unit and a priority adjusting unit. The detection judging unit is used for detecting whether all 5G neighbor cells of the 4G cell allow or reject RedCap terminal access when RedCap terminal works in the 4G service cell each time. If all 5G neighbor cells of the 4G cell are 5G cells which reject RedCap terminal access, the 4G cell is judged to be an unfriendly 4G cell; if at least one 5G neighbor cell of the 4G cell is a 5G cell allowing RedCap terminals to access, the 4G cell is determined to be a friendly 4G cell, and the priority adjustment unit is used for indicating the priority of the target frequency point by cellReselctionPriority fields contained in a system information block five SIB5 issued by the network when the RedCap terminals work in the 5G serving cell subsequently; the priority of the unfriendly 4G cell described in cellReselctionPriority field is reduced. Or the priority adjusting unit is changed into a parameter adjusting unit; and the parameter adjusting unit is used for reducing the R value of the unfriendly 4G cell in the intra-system reselection scene or improving the reporting threshold of the A3 event measurement result of the unfriendly 4G neighbor cell in the intra-system handover scene when the RedCap terminal works in the 4G serving cell subsequently.
The invention has the technical effects that: the probability of RedCap terminals accessing to friendly 4G cells is improved, the probability of RedCap terminals accessing to unfriendly 4G cells is reduced, and therefore the success rate of smoothly returning to the 5G cells allowing RedCap terminals to access after RedCap terminals enter the 4G cells is improved.
Drawings
Fig. 1 is a flowchart of an embodiment one of a method for selecting a 4G cell by a RedCap terminal based on history data according to the present invention.
Fig. 2 is a schematic flow chart of an example one of the step S1.
Fig. 3 is a schematic flow chart of an example two of the step S1.
Fig. 4 is a schematic flow chart of an example three of the step S1.
Fig. 5 is a flowchart of a second embodiment of a method for selecting a 4G cell by a RedCap terminal based on history data according to the present invention.
Fig. 6 is a schematic structural diagram of an embodiment one of a device for selecting a 4G cell by a RedCap terminal based on historical data according to the present invention.
Fig. 7 is a schematic structural diagram of a second embodiment of a device for selecting a 4G cell by a RedCap terminal based on historical data according to the present invention.
The reference numerals in the drawings illustrate: detection judging unit 1, priority adjusting unit 2, parameter adjusting unit 3.
Detailed Description
Referring to fig. 1, an embodiment of a method for selecting a 4G cell by a RedCap terminal based on history data according to the present invention includes the following steps.
Step S1: a RedCap capable mobile terminal is called RedCap terminal, and RedCap terminal detects whether all 5G neighbors of a 4G cell are allowed to access a RedCap terminal or denied RedCap terminal access to a 5G cell each time the terminal is operating in the 4G serving cell. If all 5G neighbor cells of the 4G cell are 5G cells which reject RedCap terminal access, the 4G cell is judged to be an unfriendly 4G cell. If at least one 5G neighbor of the 4G cell is a 5G cell that allows RedCap terminals to access, the 4G cell is determined to be a friendly 4G cell.
In particular, redCap terminals from unfriendly 4G cells cannot return to 5G cells that allow RedCap terminal access in a different system reselection, or different system redirection, or different system handoff manner. It is possible for RedCap terminals from friendly 4G cells to revert to 5G cells that allow RedCap terminals access in a different system reselection, or different system redirection, or different system handover. "friendly" or "unfriendly" is based on whether RedCap terminals may return from the 4G cell to the "5G cell allowed RedCap terminal access".
Step S2: when the RedCap terminal operates in the 5G serving cell at any time after step S1, the SIB5 (system information block five) issued by the network includes a cellReselctionPriority field, where the cellReselctionPriority field indicates the priority of the target frequency point. The RedCap terminal reduces the priority of the unfriendly 4G cells recorded in the cellReselctionPriority field, for example, the unfriendly 4G cells are arranged behind the friendly 4G cells, so that subsequent scenes such as 4G cell selection, different system reselection, different system redirection, different system switching and the like are easier to access to the friendly 4G cells with the front priority, the unfriendly 4G cells with the reduced priority are more difficult to access, and the success rate of returning from the 4G cells to the 5G cell which allows the RedCap terminal to access is improved.
Referring to fig. 2, an example of the step S1 specifically includes the following sub-steps. This example-applies to the scenario where RedCap terminals return to 5G NR cells from 4G LTE cells in a heterogeneous reselection manner.
Substep S11a: redCap the terminal currently receives the SIB24 message sent by the 4G LTE cell in the 4G LTE cell, where the SIB24 message carries 5G frequency point information.
Substep S12a: and the RedCap terminal searches 5G NR cells meeting the requirements in each 5G frequency point and reads SIB1 information of the 5G NR cells. If the intraFreqReseletionRedCap-r17 parameter in the SIB1 message is allowed (allowed) and the cellBarredRedCap Rx-r17 parameter or the cellBarredRedCap Rx-r17 parameter in the SIB1 message (determined by the number of transmit antennas of the mobile terminal) is not barred (notBarred), it indicates that the 5G NR cell allows RedCap terminal access; otherwise, the 5G NR cell refuses RedCap terminal access. The cellBarredRedCap Rx-r17 parameter and the cellBarredRedCap Rx-r17 parameter in the SIB1 message are correspondingly configured according to whether the number of transmit antennas of the mobile terminal is single transmit antennas or dual transmit antennas. If the mobile terminal is a single transmit antenna, there is cellBarredRedCap Rx-r17 parameter in the SIB1 message, and no cellBarredRedCap2Rx-r17 parameter. If the mobile terminal is dual transmit antennas, there are cellBarredRedCap Rx-r17 parameters in the SIB1 message, and no cellBarredRedCap1Rx-r17 parameters.
Substep S13a: if the RedCap G NR cells searched by the terminal according to all 5G frequency points in the SIB24 message issued by the 4G LTE cell are 5G cells which are refused to be accessed by the RedCap terminal, the 4G LTE cell is an unfriendly 4G cell; otherwise, the 4G LTE cell is a friendly 4G cell.
Referring to fig. 3, an example two of the step S1 specifically includes the following sub-steps. This example two applies to the scenario where RedCap terminals return from the 4G LTE cell to the 5G NR cell in a heterogeneous system redirection manner.
Substep S11b: redCap the terminal is currently in the 4G LTE cell, and receives a RRCRELEASE message (RRC release message) sent by the 4G LTE cell, where the RRCRELEASE message includes 5G frequency point information.
Substep S12b: and the RedCap terminal searches 5G NR cells meeting the requirements in each 5G frequency point and reads SIB1 information of the 5G NR cells. If the intraFreqReseletionRedCap-r17 parameter in the SIB1 message is allowed and the cellBarredRedCap Rx-r17 parameter or the cellBarredRedCap Rx-r17 parameter (determined by the number of transmit antennas of the mobile terminal) in the SIB1 message is not forbidden, indicating that the 5G NR cell allows RedCap terminal access; otherwise, the 5G NR cell refuses RedCap terminal access. The cellBarredRedCap Rx-r17 parameter and the cellBarredRedCap Rx-r17 parameter in the SIB1 message are correspondingly configured according to whether the number of transmit antennas of the mobile terminal is single transmit antennas or dual transmit antennas.
Substep S13b: if the RedCap G NR cells searched by the terminal according to all 5G frequency points in RRCRELEASE messages issued by the 4G LTE cell are 5G cells which are refused to be accessed by the RedCap terminal, the 4G LTE cell is an unfriendly 4G cell; otherwise, the 4G LTE cell is a friendly 4G cell.
Referring to fig. 4, an example three of the step S1 specifically includes the following sub-steps. This example three applies to the scenario where RedCap terminals return to 5G NR cells from 4G LTE cells in a heterogeneous system handover.
Substep S11c: redCap the terminal currently receives a mobile from eutran command message (a heterogeneous handover message sent by the network to the terminal) sent by the 4G LTE cell in the 4G LTE cell, where the mobile from eutran command message carries a RRCReconfiguraion message (RRC reconfiguration message) containing configuration information of the 5GNR target cell. The RRCReconfiguraion message may or may not include the initialDownlinkBWP-RedCap-r17 field.
Substep S12c: and the RedCap terminal judges whether the 5G NR target cell is a 5G NR cell which allows RedCap access according to whether the RRCReconfiguraion message contains initialDownlinkBWP-RedCap-r17 fields. If RRCReconfiguraion includes initialDownlinkBWP-RedCap-r17 field, which indicates that the 5GNR target cell allows RedCap terminal access, the 4G LTE cell is a friendly 4G cell, and the step S1 is completed. If RRCReconfiguraion does not include initialDownlinkBWP-RedCap-r17 field, the 5G NR target cell refuses RedCap the terminal access and continues to the next step.
Substep S13c: if the 5G NR target cell is a 5G NR cell which refuses RedCap to access, after the heterogeneous system handover from 4G to 5G fails and the RedCap terminal returns to the 4G LTE cell, the RedCap terminal searches the 5G NR cell by a background searching method and the like, and judges whether the 5G NR cell allows RedCap terminal to access or refuses RedCap terminal to access according to the SIB1 message of each searched 5G NR cell. If the intraFreqReseletionRedCap-r17 parameter in the SIB1 message is allowed and the cellBarredRedCap Rx-r17 parameter or the cellBarredRedCap Rx-r17 parameter (determined by the number of transmit antennas of the mobile terminal) in the SIB1 message is not forbidden, indicating that the 5G NR cell allows RedCap terminal access; otherwise, the 5G NR cell refuses RedCap terminal access. The cellBarredRedCap Rx-r17 parameter and the cellBarredRedCap Rx-r17 parameter in the SIB1 message are correspondingly configured according to whether the number of transmit antennas of the mobile terminal is single transmit antennas or dual transmit antennas.
Substep S14c: if all 5G NR cells searched by the RedCap G terminal are 5G cells which are refused to be accessed by the RedCap terminal, the 4G LTE cell is an unfriendly 4G cell; otherwise, the 4G LTE cell is a friendly 4G cell.
Comparing fig. 4 with fig. 2 and fig. 3, it can be seen that example three is significantly different from the first two examples. The method mainly comprises the steps that a target cell for switching the different systems is determined by a network, and whether the configuration of which neighboring cell and neighboring cell support RedCap capability is possibly modified at any time, so that whether the 4G cell is friendly cannot be directly confirmed through a switching result, and whether the 4G cell is friendly can be judged through subsequent steps.
Optionally, in the step S1, when RedCap determines that the 4G cell is not a friendly 4G cell, the degradation timer Tredcap is started. The timing duration of the degradation timer Tredcap may be set to 30 minutes, 60 minutes, etc., for example, based on information of network conditions, cell density, geographical location, etc. After expiration of the degradation timer Tredcap, the RedCap terminal cancels the conclusion that the 4G cell is determined to be an unfriendly 4G cell, and subsequently re-determines whether the 4G cell is an unfriendly 4G cell or a friendly 4G cell. In said step S2, the RedCap terminal decreases the priority of the 4G cell before the expiration of the degradation timer Tredcap. After expiration of the degradation timer Tredcap, the RedCap terminal cancels the 4G cell from being prioritized down.
Referring to fig. 5, in a second embodiment of a method for selecting a 4G cell by a RedCap terminal based on history data according to the present invention, step S2 in the first embodiment of the method shown in fig. 1 is changed to step S3. The step S3 is as follows: when the RedCap terminal works in the 4G service cell at any time after the step S1, the R value (grading value) of the unfriendly 4G cell is reduced in the intra-system reselection scene, or the condition threshold for reporting the A3 event measurement result of the unfriendly 4G neighbor cell is improved in the intra-system handover scene. Therefore, the RedCap terminal can be more easily accessed to the friendly 4G cell when changing cells under the 4G LTE network, and the success rate of returning from the 4G cell to the 5G cell which allows the RedCap terminal to access is improved.
An example one of the step S3 is: when the RedCap terminal works in the 4G LTE cell subsequently, the R value of the current service cell and the R value of the neighbor cell are calculated by using a cell reselection R criterion in a intra-system reselection scene, the R value of the unfriendly 4G cell is subtracted by the newly added first parameter offsetCS, so that the RedCap terminal is easier to reselect or keep in the friendly 4G cell, and the probability of accessing the unfriendly 4G cell is reduced. The value of the first parameter offsetCS is, for example, 3dB. For example, when the currently serving 4GLTE cell is a friendly 4G cell and the neighbor cell is an unfriendly 4G cell, when the R value Rn of the neighbor cell is calculated by using the cell reselection R criterion, the Rn is additionally subtracted offsetCS. As another example, when the currently serving 4G LTE cell is an unfriendly 4G cell and the neighbor cell is a friendly 4G cell, when the R value Rs of the current serving cell is calculated using the cell reselection R criterion, rs is subtracted offsetCS additionally.
An example two of the step S3 is: when the RedCap terminal works in the 4G LTE cell later, the condition for reporting the A3 event measurement result of the unfriendly 4G neighbor cell is additionally increased by a reporting threshold under the intra-system handover scene, so that the RedCap terminal is easier to access other friendly 4G cells or remain in the source 4G cell. Only when the signal of the neighbor cell with no better signal or the unfriendly 4G cell is much stronger than the signal of the current service cell, the measurement result of the A3 event can be reported to the network, and the subsequent switching instruction of the network is waited. The condition for reporting the A3 event measurement result of the neighbor cell by the mobile terminal specified by the existing communication protocol is Mn+Ofn+Ocn+Hys < Mp+ Ofp + Ocp +off. Where Mn is the measurement result of the neighbor cell, ofn is the measurement object specific Offset of the reference signal of the neighbor cell, ocn is the cell specific Offset of the neighbor cell, hys is the hysteresis parameter of the event, mp is the measurement result of the current serving cell, ofp is the measurement object specific Offset of the current serving cell, ocp is the cell specific Offset of the current serving cell, and off is the Offset parameter of the event, i.e., a3 Offset (a 3-Offset). If a certain neighboring cell is an unfriendly 4G cell, the condition of the RedCap terminal for reporting the A3 event measurement result of the unfriendly 4G neighboring cell is changed into Mn+Ofn+Ocn+Hys < mp+ Ofp + Ocp +off+delta offsetHO, wherein delta offsetHO is a newly added second parameter which represents an additionally added reporting threshold. Let Ofn, ocn, hys, ofp and Ocp be set to 0, 3dB off and 5dB delta offsetHO. The legacy condition means that once the mobile terminal finds that the measurement value of any neighbor cell is 3dB higher than the current serving cell, it should report the measurement result of the A3 event to the network. The new condition of the invention indicates that the reporting threshold is additionally increased by 5dB aiming at the unfriendly 4G cell, and at the moment, when RedCap terminals find that the signal of the unfriendly 4G cell is 8dB stronger than the signal of the current service cell, the measurement result of the A3 event can be reported to the network.
Referring to fig. 6, an embodiment of an apparatus for selecting a 4G cell by a RedCap terminal based on history data according to the present invention includes a detection and determination unit 1 and a priority adjustment unit 2. The embodiment of the device shown in fig. 6 corresponds to the embodiment one of the method shown in fig. 1.
The detection judging unit 1 is configured to detect whether all 5G neighbor cells of the 4G cell are allowed to be accessed by the RedCap terminal or reject to be accessed by the RedCap terminal when the RedCap terminal operates in the 4G serving cell each time. If all 5G neighbor cells of the 4G cell are 5G cells which reject RedCap terminal access, the 4G cell is judged to be an unfriendly 4G cell. If at least one 5G neighbor of the 4G cell is a 5G cell that allows RedCap terminals to access, the 4G cell is determined to be a friendly 4G cell.
The priority adjustment unit 2 is configured to, when the RedCap terminal subsequently works in the 5G serving cell, include a cellReselctionPriority field in SIB5 issued by the network, where the field indicates a priority of the target frequency point; the priority of the unfriendly 4G cell described in cellReselctionPriority field is reduced.
Referring to fig. 7, in a second embodiment of the apparatus for selecting a 4G cell by a RedCap terminal based on history data according to the present invention, the priority adjustment unit 2 in the first embodiment of the apparatus shown in fig. 6 is changed to the parameter adjustment unit 3. The second embodiment of the device shown in fig. 7 corresponds to the second embodiment of the method shown in fig. 5.
The parameter adjusting unit 3 is configured to reduce an R value of the unfriendly 4G cell in the intra-system reselection scenario or increase a condition threshold for reporting an A3 event measurement result of the unfriendly 4G neighbor cell in the intra-system handover scenario when the RedCap terminal subsequently operates in the 4G serving cell.
According to the historical data of RedCap terminals in 4G cells, the invention learns whether each 4G cell has 5G neighbor cells supporting RedCap terminal access, and records the 5G neighbor cell characteristics of each accessed 4G cell (namely whether the 4G cell belongs to an unfriendly 4G cell or a friendly 4G cell). And subsequently, when the RedCap terminal is in the 5G network, adjusting the priority of the 4G cell according to the recorded 5G neighbor cell characteristics of the 4G cell. And subsequently, when the RedCap terminal is in the 4G network, adjusting parameters of different scenes according to the recorded 5G neighbor cell characteristics of the 4G cell. The purpose of these operations is to make RedCap the probability of entering a friendly 4G cell greater than the probability of entering an unfriendly 4G cell. When the RedCap terminal is in the friendly 4G cell, the probability of smoothly returning to the '5G cell allowing RedCap terminal to access' is greatly improved compared with when the RedCap terminal is in the unfriendly 4G cell.
The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for a RedCap terminal to select a 4G cell based on historical data, comprising the steps of;
Step S1: each time the RedCap terminal works in a 4G service cell, detecting whether all 5G neighbor cells of the 4G cell allow or reject RedCap terminal access; if all 5G neighbor cells of the 4G cell are 5G cells which reject RedCap terminal access, the 4G cell is judged to be an unfriendly 4G cell; if at least one 5G neighbor cell of the 4G cell is a 5G cell which allows RedCap terminals to access, the 4G cell is judged to be a friendly 4G cell;
Step S2: when the RedCap terminal works in the 5G service cell subsequently, a cellReselctionPriority field is contained in a system information block five SIB5 issued by the network to indicate the priority of a target frequency point; the RedCap terminal reduces the priority of the unfriendly 4G cell described in the cellReselctionPriority field.
2. The method for selecting a 4G cell by a RedCap terminal based on history data according to claim 1, wherein said step S1 specifically includes the following sub-steps;
Substep S11a: redCap the terminal currently receives SIB24 information sent by the 4G LTE cell in the 4G LTE cell, wherein the SIB24 information carries 5G frequency point information;
substep S12a: the RedCap terminal searches 5G NR cells meeting the requirements in each 5G frequency point, reads SIB1 information of each 5G NR cell and judges whether each 5G NR cell allows or denies RedCap terminal access;
substep S13a: if the RedCap G NR cells searched by the terminal according to all 5G frequency points in the SIB24 message issued by the 4G LTE cell are 5G cells which are refused to be accessed by the RedCap terminal, the 4G LTE cell is an unfriendly 4G cell; otherwise, the 4G LTE cell is a friendly 4G cell.
3. The method for selecting a 4G cell by a RedCap terminal based on history data according to claim 1, wherein said step S1 specifically includes the following sub-steps;
Substep S11b: redCap the terminal is currently in the 4G LTE cell, receives RRCRELEASE information sent by the 4G LTE cell, wherein the RRCRELEASE information comprises 5G frequency point information;
Substep S12b: the RedCap terminal searches 5G NR cells meeting the requirements in each 5G frequency point, reads SIB1 information of each 5G NR cell and judges whether each 5G NR cell allows or denies RedCap terminal access;
Substep S13b: if the RedCap G NR cells searched by the terminal according to all 5G frequency points in RRCRELEASE messages issued by the 4G LTE cell are 5G cells which are refused to be accessed by the RedCap terminal, the 4G LTE cell is an unfriendly 4G cell; otherwise, the 4G LTE cell is a friendly 4G cell.
4. The method for selecting a 4G cell by a RedCap terminal based on history data according to claim 1, wherein said step S1 specifically includes the following sub-steps;
Substep S11c: redCap the terminal currently receives a mobile from EUTRACommand message sent by the 4G LTE cell in the 4G LTE cell, wherein the mobile from EUTRACommand message carries RRCReconfiguraion message indicating a 5G NR target cell;
Substep S12c: the RedCap terminal judges whether the 5G NR target cell allows or refuses RedCap terminal access according to whether the RRCReconfiguraion message contains initialDownlinkBWP-RedCap-r17 fields; if so, the 4G LTE cell is a friendly 4G cell, indicating that the 5G NR target cell allows RedCap terminals to access; if not, the 5G NR target cell refuses RedCap terminal access, and the next step is continued;
Substep S13c: the RedCap terminal searches 5G NR cells, reads SIB1 information of each 5G NR cell and judges whether each 5G NR cell allows or denies RedCap terminal access;
Substep S14c: if all 5G NR cells searched by the RedCap G terminal are 5G cells which are refused to be accessed by the RedCap terminal, the 4G LTE cell is an unfriendly 4G cell; otherwise, the 4G LTE cell is a friendly 4G cell.
5. The method of selecting a 4G cell by a history data based RedCap terminal according to any one of claims 2 to 4, wherein in the sub-steps S12a, S12b, S13c, for a single transmit antenna RedCap terminal, if the parameters intraFreqReseletionRedCap-r17 in SIB1 message are allowed and the parameters cellBarredRedCap Rx-r17 in SIB1 message are not forbidden, this means that the 5G NR cell allows RedCap terminal access; otherwise, the 5G NR cell refuses RedCap terminal access; for RedCap terminals with dual transmit antennas, if the intraFreqReseletionRedCap-r17 parameter in the SIB1 message is allowed and the cellBarredRedCap2Rx-r17 parameter in the SIB1 message is not forbidden, indicating that the 5G NR cell allows RedCap terminals to access; otherwise, the 5G NR cell refuses RedCap terminal access.
6. The method for selecting a 4G cell by a RedCap terminal based on history data according to claim 1, wherein in the step S1, when the RedCap terminal determines that the 4G cell is not friendly 4G cell, a degradation timer is started; after expiration of the timing of the downgrade timer, the RedCap terminal cancels the conclusion that the 4G cell is determined to be an unfriendly 4G cell; in the step S2, before the expiration of the timing of the degradation timer, the RedCap terminal decreases the priority of the 4G cell; after expiration of the downgrade timer, the RedCap terminal cancels the reduction of the priority of the 4G cell.
7. The method for selecting a 4G cell by a history data based RedCap terminal according to claim 1, wherein the step S2 is changed to the step S3; the step S3 is as follows: when the RedCap terminal works in the 4G service cell subsequently, the R value of the unfriendly 4G cell is reduced in the intra-system reselection scene, or the reporting threshold of the measurement event of the unfriendly 4G neighbor cell is improved in the intra-system handover scene.
8. The method for selecting a 4G cell by a RedCap terminal based on historical data according to claim 7, wherein in the step S3, when the RedCap terminal works in a 4G LTE cell subsequently, when R values of a current serving cell and a neighboring cell are calculated using a cell reselection R criterion in an intra-system reselection scenario, the R value of the unfriendly 4G cell is subtracted by the added first parameter, that is, the R value of the unfriendly 4G cell is reduced.
9. The method for selecting a 4G cell by a RedCap terminal based on historical data according to claim 7, wherein in the step S3, when the RedCap terminal works in a 4G LTE cell subsequently, a newly added second parameter is added as an additional threshold to increase the reporting threshold of the measurement event of the unfriendly 4G neighbor cell under the intra-system handover scenario.
10. The device for selecting the 4G cell by the RedCap terminal based on the historical data is characterized by comprising a detection judging unit and a priority adjusting unit;
The detection judging unit is used for detecting whether all 5G neighbor cells of the 4G cell allow or reject RedCap terminal access when the RedCap terminal works in the 4G service cell each time; if all 5G neighbor cells of the 4G cell are 5G cells which reject RedCap terminal access, the 4G cell is judged to be an unfriendly 4G cell; if at least one 5G neighbor cell of the 4G cell is a 5G cell which allows RedCap terminals to access, the 4G cell is judged to be a friendly 4G cell;
The priority adjustment unit is configured to indicate, when the RedCap terminal subsequently works in a 5G serving cell, a priority of a target frequency point by cellReselctionPriority field contained in a system information block five SIB5 issued by a network; the priority of the unfriendly 4G cell recorded in cellReselctionPriority field is reduced;
or the priority adjusting unit is changed into a parameter adjusting unit; and the parameter adjusting unit is used for reducing the R value of the unfriendly 4G cell in the intra-system reselection scene or improving the reporting threshold of the A3 event measurement result of the unfriendly 4G neighbor cell in the intra-system handover scene when the RedCap terminal works in the 4G serving cell subsequently.
CN202410139879.1A 2024-01-31 2024-01-31 Method and device for RedCap terminal to select 4G cell based on historical data Pending CN118055464A (en)

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