CN117336802A - RedCAP terminal and switching control method thereof - Google Patents

RedCAP terminal and switching control method thereof Download PDF

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Publication number
CN117336802A
CN117336802A CN202311213136.6A CN202311213136A CN117336802A CN 117336802 A CN117336802 A CN 117336802A CN 202311213136 A CN202311213136 A CN 202311213136A CN 117336802 A CN117336802 A CN 117336802A
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CN
China
Prior art keywords
cell
redcap
terminal
redcap terminal
handover
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CN202311213136.6A
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Chinese (zh)
Inventor
黄伟
冯海涛
田建军
张艳
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ASR Microelectronics Co Ltd
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ASR Microelectronics Co Ltd
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Priority to CN202311213136.6A priority Critical patent/CN117336802A/en
Publication of CN117336802A publication Critical patent/CN117336802A/en
Pending legal-status Critical Current

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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
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • 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
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • 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
    • H04W36/08—Reselecting an access point
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/165—Performing reselection for specific purposes for reducing network power consumption

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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 switching control method of a RedCAP terminal. In the process of switching the RedCAP terminal to any NR cell B, if the RedCAP terminal finds that the NR cell B does not allow the access of the RedCAP terminal, the information of the NR cell B is added into a forbidden access list. When the RedCAP terminal executes NR measurement configured by a network side, if the RedCAP terminal detects an NR neighbor cell meeting a measurement report, the RedCAP terminal judges whether the NR neighbor cell currently exists in a forbidden access list; if yes, the RedCAP terminal does not send the measurement report of the NR neighbor cell to the network; if not, the RedCAP terminal normally transmits the measurement report of the NR neighbor cell to the network. The invention controls the RedCAP terminal not to initiate the cell switching attempt to the confirmed 5G common NR cell, and ensures that the data service of the RedCAP terminal is continuous without time-out.

Description

RedCAP terminal and switching control method thereof
Technical Field
The invention relates to a control method for Intra-radio access technology (Intra Radio Access Technology, intra-RAT) handover and Inter-radio access technology (Inter Radio Access Technology, inter-RAT) handover of a RedCAP (Reduced Capability, reduced performance) terminal.
Background
The RedCap terminal is also called a lightweight NR (NR-Light) terminal, and the main application scene comprises industrial applications such as an industrial sensor, video monitoring and the like and consumer applications of wearable equipment. The remote upgrade and maintenance are needed for the most part of industry application-oriented RedCAP terminals in an unattended scene, so that the RedCAP terminals have high requirements on network coverage and connection reliability, and meanwhile, the RedCAP terminals need to keep low power consumption.
Whether or not the RedCap terminal can access a cell is mainly in accordance with the specifications of the existing communication protocols 3gpp TS 38.300, 38.304 and 38.331. The parameter cellbarreddedcap 1Rx, cellBarredRedCap Rx in SIB1 (System Information Block Type, system information block one) indicates whether the own cell allows a 1Rx (single receive antenna), 2Rx (dual receive antenna) end access; the parameter halfdupex RedCap indicates whether the cell allows the RedCap terminal supporting only half duplex to access or not, and the parameter is only applicable to FDD (Frequency Division Duplexing, frequency division duplex) system. If the INTRAFreqReselection RedCAP does not appear in SIB1, the cell prohibits access of the RedCAP terminal. And the RedCAP terminal judges the indication information, and can reside in a cell and initiate random access when the requirement of allowing access is met. The RedCap terminal can only camp on an NR cell supporting RedCap (hereinafter referred to as a 5G RedCap cell) and cannot camp on a normal NR cell not supporting RedCap (hereinafter referred to as a 5G normal NR cell) in a 5G NR (New Radio) network.
Cell reselection (reselection), redirection (redirection), handover (handover) are three basic procedures for mobility management in a mobile communication system. The reselection refers to that the mobile terminal selects a resident cell according to the reselection parameter configuration (configured in a broadcast message of the cell for all mobile terminals in the cell) and neighbor cell measurement results of the network in an IDLE state (rrc_idle) or a non-active state (rrc_inactive), and the mobile terminal is in the IDLE state or the non-active state before and after reselection. The redirection refers to that when the mobile terminal is switched to an idle state or an inactive state in a connection state (RRC_CONNECTED), the network designates the frequency point of a neighboring cell in the RRCRelease message, the mobile terminal is switched to the idle state or the inactive state from the connection state, searches for the residence of a target cell on the designated frequency point, and the mobile terminal is switched to the idle state or the inactive state after redirection. The switching refers to the behavior of the mobile terminal in the connection state, the target cell is explicitly specified by the network, and the mobile terminal is still in the connection state after switching to the target cell. The reselection is performed by the mobile terminal autonomously deciding based on the measurement result (which is not reported to the network) and the reselection parameter configuration. Redirection and handover are indicated by network-issued commands, typically triggered by the mobile terminal sending measurement reports.
Cell switching refers to a process that a mobile terminal migrates wireless link connection from an original cell to a target cell in a connection state according to a switching command issued by a network. If the source cell and the target cell belong to the same radio access technology (Radio Access Technology, RAT), it is called intra-radio access technology handover, also called intra-mode handover, or intra-system handover. If the original cell and the target cell belong to different radio access technologies, they are called inter-radio access technology handover, also called inter-mode handover, or inter-system handover. A typical handover is triggered by the mobile terminal reporting a measurement report.
RedCap is a technology introduced by the Release 17 (3 gpp Release 17) Release 5g version, the access of which is constrained by the above protocol specifications. To support RedCap, the 5G base station needs to be upgraded to the R17 protocol version. A 5G base station supporting only the R15 or R16 protocol version does not support access of the RedCap terminal. For the condition that the RedCAP terminal is in a non-RedCAP network environment or in a network environment where a 5GRedCap cell and a 5G common NR cell coexist, how to ensure normal initiation of the service influences the user experience of the service of the RedCAP terminal. The scale application of the RedCAP terminal depends on the large-scale coverage of the 5G network, the coverage breadth and depth of the 5G commercial network still have the defects at present, and the access of the RedCAP terminal is supported to adapt and upgrade the 5G commercial network. Therefore, when the 5G network does not fully realize breadth and depth coverage, the RedCap terminal needs to be compatible to support 4G mode access in an application scenario with high requirements on network coverage continuity and mobility, which can enable the RedCap terminal to have wider service access and processing capability and forward compatibility between the terminal device and the network device. Therefore, the RedCAP multimode terminal can drive large-scale development through wider access capability. Because RedCap is a technology introduced by 5G r17, the existing 4G LTE network needs to be upgraded or compatible to support RedCap multimode capability, and the RedCap multimode terminal needs to be actively compatible with the existing 4G network capability, otherwise, compatibility problems are easily caused, and normal service access is affected.
The RedCap terminal in the present invention includes both a RedCap single-mode terminal supporting only the RedCap cell access of the 5G NR network and a RedCap multimode terminal supporting both the RedCap cell of the 5G NR network and the 4G LTE network access.
Referring to fig. 1, the conventional intra-radio access technology cell handover procedure of the RedCap terminal sequentially includes the following steps. This occurs when the RedCap terminal is in a 5G network environment where 5G RedCap cells and 5G normal NR cells coexist.
Step A1: the RedCap terminal currently resides in a 5G RedCap cell a supporting access of the RedCap terminal, and establishes a service connection.
Step A2: when the RedCap terminal enters an NR mode connection state, the network configures NR measurement (including information of NR frequency points, measurement intervals, test report events, etc.) through a reconfiguration message. There may be 5G RedCap cells or 5G normal NR cells in the configured NR frequency points.
Step A3: the RedCap terminal performs the measurements. Identification of the RedCap cell by the RedCap terminal depending on the parameters in the obtained SIB1, the RedCap terminal cannot identify whether the neighbor cell is a 5G RedCap cell in the measurement process performed in the connected state. If the cell signal quality under some NR frequency points meets the measurement report condition under the connection state, the RedCAP terminal sends a measurement report and reports measurement events (such as an A3 event, an A4 event, an A5 event and the like) to inform the network that a better NR neighbor cell B exists.
Step A4: based on these measurement events, the network issues an RRC reconfiguration (rrcrecon configuration) message instructing the RedCap terminal to switch to target NR cell B. For some objective reasons, for example, the network neighbor relation may be dynamically added, or the network optimization work is not completed, or the network side has some reason that the target cell of the handover procedure is not limited or guaranteed to be a 5G RedCap cell, etc., and the target cell B may be a 5G common NR cell.
Step A5: the RedCap terminal attempts to switch to the NR neighbor B within the radio access technology, but fails to switch to the target cell B because it does not support RedCap terminal access.
Step A6: the RedCap terminal searches the network and resides in a 5G RedCap cell supporting the access of the RedCap terminal, which can be an original 5G RedCap cell A or other RedCap cells, and reestablishes service connection.
Steps A2-A6 are then repeated, which may be multiple times. The network side indicates the RedCap terminal to always try the handover behaviors in the radio access technologies which are supposed to fail, and the RedCap terminal always searches cells because of continuous handover failure, so that service initiation is difficult, and the service process is disconnected and cannot be normally maintained.
Referring to fig. 2, the conventional inter-radio access technology cell handover procedure of the RedCap multimode terminal sequentially includes the following steps. This occurs when the RedCap multimode terminal is in a network environment where a 4G LTE network and a 5G NR network coexist.
Step B1: the RedCap multimode terminal currently resides in the 4G LTE cell a and establishes a service connection.
Step B2: when the RedCap multimode terminal enters the LTE mode connection state, since the network generally deploys 5G mode priority, the LTE network generally configures different system NR measurements (including information such as NR frequency points, measurement intervals, test report events, etc.) for the RedCap multimode terminal through a reconfiguration message in the connection state. There may be 5G RedCap cells or 5G normal NR cells in the configured NR frequency points.
Step B3: the RedCap multimode terminal performs heterogeneous NR measurements. Identification of the RedCap multimode terminal by the RedCap multimode terminal depends on obtaining parameters in SIB1, and the RedCap multimode terminal cannot identify whether these NR cells are RedCap cells or not in the measurement process performed in the connected state. And if the cell signal quality under some NR frequency points meets the different system measurement report conditions under the LTE connection state, the RedCAP multimode terminal sends a measurement report, reports a measurement event (such as a B1 event, a B2 event and the like) and informs the network of the existence of a better NR neighbor cell B.
Step B4: based on these measurement events, the network issues an air interface signaling mobilityfromeutra command (inter radio access technology handover) to instruct the RedCap multimode terminal to handover to the target NR cell B. For some objective reasons, for example, the network neighbor relation may be dynamically added, or the network optimization work is not completed, or the network side does not limit or ensure that the NR target cells under the different system frequency points are necessarily supported by the access of the RedCap terminal, and the target cell B meeting the handover criterion may be a 5G common NR cell.
Step B5: the RedCap multimode terminal attempts to switch between radio access technologies to the NR neighbor cell B, but fails to switch to the target cell B because it does not support RedCap terminal access.
Step B6: the RedCap multimode terminal is switched to the LTE mode to try to search the network and stay in the LTE cell, and can be an original 4G LTE cell A or other LTE cells, so that service connection is reestablished.
Steps B2-B6 are then repeated, which may be multiple times. The network side indicates that the RedCap multimode terminal always tries to switch between the radio access technologies which are supposed to fail, and the RedCap multimode terminal always searches cells because of continuous switching failure, so that service initiation is difficult, the service process is time-off, and the maintenance cannot be normally carried out.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to enable the RedCap terminal to maintain service continuity in a network environment where 5G RedCap cells and 5G normal NR cells coexist or in a network environment where 4G and 5G coexist.
In order to solve the technical problems, the invention provides a switching control method of a RedCap terminal, which comprises the following steps. Step S1: in the process of switching the RedCAP terminal to any NR cell B, if the RedCAP terminal finds that the NR cell B does not allow the access of the RedCAP terminal, the information of the NR cell B is added into a forbidden access list. Step S2: when the RedCAP terminal executes NR measurement configured by a network side, if the RedCAP terminal detects an NR neighbor cell meeting a measurement report, the RedCAP terminal judges whether the NR neighbor cell currently exists in a forbidden access list; if yes, the RedCAP terminal does not send the measurement report of the NR neighbor cell to the network; if not, the RedCAP terminal normally transmits the measurement report of the NR neighbor cell to the network.
Further, the handover is an intra-radio access technology handover; the step S1 is executed during the intra-radio access technology handover of the RedCap terminal from any 5GRedCap cell a to any NR cell B, and the step S2 is executed when the RedCap terminal executes the NR measurement configured by the network side in the NR connection state.
Further, the handover is an inter-radio access technology handover; the step S1 is executed during the process of performing inter-radio access technology handover from any 4GLTE cell a to any NR cell B by the RedCap terminal, and the step S2 is executed when the RedCap terminal performs inter-system NR measurement configured on the network side in the LTE connected state.
Further, in the step S1, the information added in the forbidden access list includes a cell frequency point (NR-ARFCN, NR Absolute Radio Frequency Channel Number), a physical layer cell identifier (PCI, physical Cell Identity), and a subcarrier spacing (Subcarrier Spacing) of a synchronization signal block (SSB, synchronization Signal Block) of the NR cell B; the information is stored in a nonvolatile memory of the RedCAP terminal; in the step S2, the judgment basis is that the three information of the cell frequency point of the NR neighboring cell, the physical layer cell identifier, the subcarrier interval of the synchronization signal block and the certain NR cell in the forbidden access list are all consistent.
Further, in the step S1, the information added in the forbidden access list further includes a global cell identifier of the original cell a; in the step S2, the judgment basis is that the four pieces of information of the cell frequency point of the NR neighbor cell, the physical layer cell identifier, the subcarrier interval of the synchronization signal block, the global cell identifier of the current cell and the four pieces of information of a certain NR cell in the forbidden access list are all identical.
Further, in the step S1, the RedCap terminal further sets an expiration date for adding the information of the NR cell B to the forbidden access list; when the validity period of the cell B is exceeded, the RedCap terminal deletes the information of the NR cell B from the access forbidden list.
Preferably, the step S1 is performed during the first handover of the RedCap terminal to any NR cell B.
The invention also provides a RedCap terminal for realizing the switching control, which comprises a switching failure recording unit and a switching judgment executing unit. And the handover failure recording unit is used for adding the information of the NR cell B into a forbidden access list if the RedCAP terminal finds that the NR cell B does not allow the access of the RedCAP terminal in the process of switching the RedCAP terminal to any NR cell B. The switching judgment execution unit is used for judging whether an NR neighbor cell meeting a measurement report currently exists in a forbidden access list or not if the NR neighbor cell is detected when the RedCAP terminal executes NR measurement configured on a network side; if yes, the RedCAP terminal does not send the measurement report of the NR neighbor cell to the network; if not, the RedCAP terminal normally transmits a measurement report to the network.
The invention has the technical effects that: and controlling the RedCAP terminal not to initiate a cell switching attempt to the confirmed 5G common NR cell, and ensuring that the data service of the RedCAP terminal is continuous without time-out.
Drawings
Fig. 1 is a schematic diagram of a cell handover procedure in a radio access technology of a conventional RedCap terminal.
Fig. 2 is a schematic diagram of a cell-to-cell handover procedure between radio access technologies of a conventional RedCap multimode terminal.
Fig. 3 is a flow chart of a handover control method in radio access technology of a RedCap terminal according to the present invention.
Fig. 4 is a flow chart of a method for controlling inter-radio access technology handover of a RedCap multimode terminal according to the present invention.
Fig. 5 is a schematic structural diagram of a RedCap terminal for implementing intra-radio access technology handover control according to the present invention.
Fig. 6 is a schematic structural diagram of a RedCap multimode terminal for implementing inter-radio access technology handover control according to the present invention.
The reference numerals in the drawings illustrate: the method comprises the steps of 1, 2, 3 and 4, wherein 1 is a switching failure recording unit in a wireless access technology, 2 is a switching judging executing unit in the wireless access technology, 3 is a switching failure recording unit between wireless access technologies, and 4 is a switching judging executing unit between wireless access technologies.
Detailed Description
Referring to fig. 3, the intra-radio access technology handover control method for a RedCap terminal according to the present invention includes the following steps. The method is suitable for a 5G network environment where the RedCAP terminal is in a 5G RedCAP cell and a 5G common NR cell coexist.
Step SA1: in the process that the RedCAP terminal performs the intra-radio access technology handover from any 5G RedCAP cell A to any NR cell B, if the RedCAP terminal finds that the NR cell B does not allow the access of the RedCAP terminal, the information of the 5G ordinary NR cell B is added into a forbidden access list, wherein the information indicates that the NR cell B belongs to the 5G ordinary NR cell. The added information comprises the cell frequency point, physical layer cell identification and subcarrier spacing of the synchronous signal block of the 5G common NR cell B. The information is stored in a nonvolatile memory of the RedCAP terminal, so that the RedCAP terminal can still be used after being started next time.
Optionally, the RedCap terminal further sets a validity period for adding information of the 5G normal NR cell B to the forbidden access list. And deleting the information of the 5G ordinary NR cell B from the forbidden access list when the validity period of the 5G ordinary NR cell B is exceeded. Thus, when the 5G common NR cell B is accessed by the network upgrading support RedCAP terminal, the 5G common NR cell B is changed into the 5G RedCAP cell B, and the RedCAP terminal can normally access the 5G RedCAP cell B.
In this step, the RedCap terminal determines that a certain NR cell B is a target cell from the 5G RedCap cell a through intra-radio access technology handover (for example, first time), obtains downlink synchronization of the target cell B in the process of attempting to access the target cell B, and successfully receives a system message MIB (master information block, a master information block) and SIB1. If the parameter in SIB1 indicates that the NR cell B allows access of the RedCap terminal, the RedCap terminal determines that the target cell B is a 5G RedCap cell, and the RedCap terminal continues to execute a normal intra-radio technology handover procedure. If the parameter in SIB1 indicates that the NR cell B does not allow the access of the RedCAP terminal, the RedCAP terminal judges that the target cell B is not a 5GRedCap cell but a 5G common NR cell, and adds the information of the target cell B into a forbidden access list.
Step SA2: when the RedCap terminal executes NR measurement configured by the network side in an NR connection state, if the RedCap terminal detects an NR neighbor cell meeting a measurement report, the RedCap terminal judges whether the NR neighbor cell currently exists in a forbidden access list. The comparison range is the three information of the cell frequency point of the NR neighbor cell, the physical layer cell identification, the subcarrier interval of the synchronous signal block and each NR cell in the forbidden access list. If the three pieces of information of the NR neighbor cell are the same as the three pieces of information of one NR cell in the access forbidden list, the NR neighbor cell is indicated to exist in the access forbidden list currently; otherwise, the NR neighbor cell is not currently in the forbidden access list.
Because the cell frequency point and the physical layer cell identification are multiplexed in the mobile communication network, the mobile terminal may meet the condition that the information of the three different cells is consistent in the moving process. In order to solve this problem, it is preferable to record in the forbidden access list in step SA1 the global cell identity (Global cell identity) of the original 5G RedCap cell a where the handover to the 5G normal NR cell B was prior in the attempt of radio access technology, and add a criterion in step SA 2-to compare whether the global cell identity of the current serving cell of the RedCap terminal is identical with the global cell identity of the original 5G RedCap cell a in the forbidden access list. If the sum of the three information of the NR neighbor cell and the global cell identifier of the current cell is the same as the four information of one NR cell in the forbidden access list, the NR neighbor cell is indicated to exist in the forbidden access list currently; otherwise, the NR neighbor cell is not currently in the forbidden access list.
If the NR neighbor cell is currently in the forbidden access list, that is, the NR neighbor cell is not allowed to be accessed by the RedCAP terminal before, even if the RedCAP terminal sends a measurement report to the network, the network side can only send a switching instruction, and the RedCAP terminal executes unnecessary abnormal switching. The RedCap terminal does not send the measurement report of the NR neighbor to the network, so that the network will not issue an intra-radio access technology handover command to the NR neighbor to the RedCap terminal, which continues to maintain in the current 5G NR cell. The method avoids the complex and repeated process of network searching when the RedCAP terminal fails to switch to the NR neighbor cell, and the data service of the RedCAP terminal in a connection state is not interrupted, so that the user experience can be effectively improved.
If the NR neighbor cell is not currently in the forbidden access list, the RedCAP terminal continues to execute normal measurement report transmission and subsequent intra-radio access technology handover procedures.
Referring to fig. 4, the inter-radio access technology handover control method for a RedCap multimode terminal according to the present invention includes the following steps. The method is suitable for a network environment where the RedCAP multimode terminal is in a 4G LTE cell and a 5G NR cell coexist.
Step SB1: in the process that the RedCAP multimode terminal performs the inter-radio access technology switching from the 4G LTE cell A to any NR cell B, if the RedCAP multimode terminal finds that the NR cell B does not allow the access of the RedCAP terminal, the information of the 5G ordinary NR cell B is added into a forbidden access list, wherein the information indicates that the NR cell B belongs to the 5G ordinary NR cell. The added information comprises the cell frequency point, physical layer cell identification and subcarrier spacing of the synchronous signal block of the 5G common NR cell B. The information is stored in a nonvolatile memory of the RedCAP multimode terminal, so that the RedCAP multimode terminal can still be used after being started next time.
Optionally, the RedCap multimode terminal further sets a validity period for adding the information of the 5G normal NR cell B to the forbidden access list. And deleting the information of the 5G ordinary NR cell B from the forbidden access list when the validity period of the 5G ordinary NR cell B is exceeded. Thus, after the 5G common NR cell B is accessed by the network upgrading support RedCAP terminal, the 5G common NR cell B is changed into the 5G RedCAP cell B, and the RedCAP terminal can be normally accessed into the 5G RedCAP cell B.
In this step, the RedCap multimode terminal determines that a certain NR cell B is a target cell from the LTE cell a through inter-radio access technology handover (for example, first time), obtains downlink synchronization of the target cell B in the process of attempting to access the target cell B, and successfully receives the system message MIB and SIB1. If the parameter in SIB1 indicates that the NR cell B allows access of the RedCap terminal, the RedCap terminal determines that the target cell B is a 5G RedCap cell, and the RedCap terminal continues to perform a normal inter-radio access technology handover procedure. If the parameter in SIB1 indicates that the NR cell B does not allow the access of the RedCAP terminal, the RedCAP terminal judges that the target cell B is not a 5G RedCAP cell but a 5G common NR cell, and adds the information of the target cell B into a forbidden access list.
Step SB2: when the remote control (RdCAP) multimode terminal executes heterogeneous system NR measurement configured on a network side in an LTE connection state, if the remote control (RdCAP) multimode terminal detects an NR neighbor cell meeting a measurement report, the remote control (RdCAP) multimode terminal judges whether the NR neighbor cell currently exists in a forbidden access list. The comparison range is three information of the cell frequency point of the NR neighbor cell, the physical layer cell identification, the subcarrier interval of the synchronous signal block and each NR cell in the forbidden access list. If the three pieces of information of the NR neighbor cell are the same as the three pieces of information of one NR cell in the access forbidden list, the NR neighbor cell is indicated to exist in the access forbidden list currently; otherwise, the NR neighbor cell is not currently in the forbidden access list.
Because the cell frequency point and the physical layer cell identification are multiplexed in the mobile communication network, the mobile terminal may meet the condition that the information of the three different cells is consistent in the moving process. In order to solve this problem, it is preferable to record in the forbidden access list in step SB1 the global cell identity of the original 4G LTE cell a where the handover between radio access technologies was prior to the 5G normal NR cell B, and add a criterion in step SB 2-further compare whether the global cell identity of the current serving cell of the RedCap terminal is identical with the global cell identity of the original 4G LTE cell a in the forbidden access list. If the sum of the three information of the NR neighbor cell and the global cell identifier of the current cell is the same as the four information of one NR cell in the forbidden access list, the NR neighbor cell is indicated to exist in the forbidden access list currently; otherwise, the NR neighbor cell is not currently in the forbidden access list.
If the NR neighbor cell is currently in the forbidden access list, that is, the NR neighbor cell is not allowed to be accessed by the RedCAP terminal before, even if the RedCAP multimode terminal sends a measurement report to a network, the network side only sends a switching instruction, and the RedCAP multimode terminal executes unnecessary abnormal switching. The RedCap multimode terminal does not send the measurement report of the NR neighbor cell to the network, so that the network does not send the inter-radio access technology switching command to the NR neighbor cell to the RedCap multimode terminal, and the RedCap multimode terminal keeps on the current 4G LTE cell, or switches to other 5G RedCap cells appointed by the network side after the RedCap multimode terminal subsequently reports the measurement report of other 5G RedCap cells. The method avoids the complex and repeated process of network searching when the RedCAP multimode terminal fails to switch to the NR neighbor cell, and the data service of the RedCAP multimode terminal in a connection state cannot be interrupted, so that the user experience can be effectively improved.
If the NR neighbor cell is not currently in the forbidden access list, the RedCAP multimode terminal continues to execute normal measurement report sending and subsequent inter-radio access technology switching flow.
Referring to fig. 5, the RedCap terminal for implementing intra-radio access technology handover control according to the present invention includes an intra-radio access technology handover failure recording unit 1 and an intra-radio access technology handover judgment executing unit 2. The apparatus shown in fig. 5 corresponds to the method shown in fig. 3.
The intra-radio access technology handover failure recording unit 1 is configured to, in a process of performing intra-radio access technology handover from any 5G RedCap cell a to any NR cell B by the RedCap terminal, add information of the NR cell B to a forbidden access list if the RedCap terminal finds that the NR cell B does not allow the RedCap terminal to access.
And the intra-radio access technology handover judgment execution unit 2 is used for judging whether the NR neighbor cell currently exists in the forbidden access list if the NR neighbor cell meeting the measurement report is detected when the RedCAP terminal executes NR measurement configured at the network side in an NR connection state. If so, the RedCAP terminal does not send the measurement report of the NR neighbor cell to the network. If not, the RedCAP terminal normally transmits a measurement report to the network.
Referring to fig. 6, the RedCap multimode terminal for implementing inter-radio access technology handover control according to the present invention includes an inter-radio access technology handover failure recording unit 3 and an inter-radio access technology handover judgment executing unit 4. The apparatus shown in fig. 6 corresponds to the method shown in fig. 4.
The inter-radio access technology handover failure recording unit 3 is configured to, in a process of performing inter-radio access technology handover from the 4G LTE cell a to any NR cell B by the RedCap multimode terminal, add information of the NR cell B to the forbidden access list if the RedCap multimode terminal finds that the NR cell B does not allow the RedCap terminal to access.
The inter-radio access technology handover judgment execution unit 4 is configured to judge whether an NR neighbor cell satisfying a measurement report currently exists in the forbidden access list if the NR neighbor cell is detected when the remote control multi-mode terminal performs a heterogeneous system NR measurement configured on a network side in an LTE connected state. If so, the RedCAP terminal does not send the measurement report of the NR neighbor cell to the network. If not, the RedCAP terminal normally transmits a measurement report to the network.
The switching control method of the RedCAP terminal provided by the invention is optimized aiming at two network environments. The first network environment is a 5G network environment in which a 5G RedCAP cell and a 5G common NR cell coexist, and the RedCAP terminal is connected in an NR mode. The second network environment is a network environment in which a 4G LTE cell and a 5G NR cell coexist, and the connection state of the RedCAP multimode terminal in the LTE mode. In the two network environments, the invention can effectively control the RedCAP terminal not to initiate a cell switching attempt to the confirmed 5G common NR cell which does not allow the access of the RedCAP, ensure that the data service of the RedCAP terminal in the two network environments is not intermittent, keep continuity and are more stable, avoid the increase of power consumption caused by frequent network searching, and effectively improve the user experience of the service of the RedCAP terminal.
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 (8)

1. A switching control method of a RedCAP terminal is characterized by comprising the following steps of;
step S1: in the process that the RedCAP terminal is switched to any NR cell B, if the RedCAP terminal finds that the NR cell B does not allow the access of the RedCAP terminal, the information of the NR cell B is added into a forbidden access list;
step S2: when the RedCAP terminal executes NR measurement configured by a network side, if the RedCAP terminal detects an NR neighbor cell meeting a measurement report, the RedCAP terminal judges whether the NR neighbor cell currently exists in a forbidden access list; if yes, the RedCAP terminal does not send the measurement report of the NR neighbor cell to the network; if not, the RedCAP terminal normally transmits the measurement report of the NR neighbor cell to the network.
2. The handover control method of a RedCap terminal according to claim 1, wherein the handover is an intra-radio access technology handover; the step S1 is executed during the intra-radio access technology handover of the RedCap terminal from any 5G RedCap cell a to any NR cell B, and the step S2 is executed when the RedCap terminal executes the NR measurement configured by the network side in the NR connected state.
3. The handover control method of a RedCap terminal according to claim 1, wherein the handover is an inter-radio access technology handover; the step S1 is executed during the process of performing inter-radio access technology handover from any 4G LTE cell a to any NR cell B by the RedCap terminal, and the step S2 is executed when the RedCap terminal performs inter-system NR measurement configured on the network side in the LTE connected state.
4. The handover control method of the RedCap terminal according to claim 2 or 3, wherein in the step S1, the information added in the forbidden access list includes a cell frequency point of the NR cell B, a physical layer cell identifier, and a subcarrier interval of a synchronization signal block; the information is stored in a nonvolatile memory of the RedCAP terminal; in the step S2, the judgment basis is that the three information of the cell frequency point of the NR neighboring cell, the physical layer cell identifier, the subcarrier interval of the synchronization signal block and the certain NR cell in the forbidden access list are all consistent.
5. The handover control method of the RedCap terminal according to claim 4, wherein in the step S1, the information added in the forbidden access list further includes a global cell identifier of the original cell a; in the step S2, the judgment basis is that the four pieces of information of the cell frequency point of the NR neighbor cell, the physical layer cell identifier, the subcarrier interval of the synchronization signal block, the global cell identifier of the current cell and the four pieces of information of a certain NR cell in the forbidden access list are all identical.
6. The handover control method of a RedCap terminal according to claim 1, wherein in the step S1, the RedCap terminal further sets a validity period for adding the information of the NR cell B to the forbidden access list; when the validity period of the cell B is exceeded, the RedCap terminal deletes the information of the NR cell B from the access forbidden list.
7. A handover control method for a RedCap terminal according to claim 2 or 3, wherein said step S1 is performed during a first handover of the RedCap terminal to any NR cell B.
8. The RedCAP terminal for realizing the switching control is characterized by comprising a switching failure recording unit and a switching judgment executing unit;
the handover failure recording unit is configured to, in a handover procedure from a RedCap terminal to any NR cell B, add information of the NR cell B to a forbidden access list if the RedCap terminal finds that the NR cell B does not allow the RedCap terminal to access;
the switching judgment execution unit is used for judging whether an NR neighbor cell meeting a measurement report currently exists in a forbidden access list or not if the NR neighbor cell is detected when the RedCAP terminal executes NR measurement configured on a network side; if yes, the RedCAP terminal does not send the measurement report of the NR neighbor cell to the network; if not, the RedCAP terminal normally transmits a measurement report to the network.
CN202311213136.6A 2023-09-19 2023-09-19 RedCAP terminal and switching control method thereof Pending CN117336802A (en)

Priority Applications (1)

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CN202311213136.6A CN117336802A (en) 2023-09-19 2023-09-19 RedCAP terminal and switching control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311213136.6A CN117336802A (en) 2023-09-19 2023-09-19 RedCAP terminal and switching control method thereof

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CN117336802A true CN117336802A (en) 2024-01-02

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