CN117320088A - RedCAP terminal and redirection control method thereof - Google Patents

Abstract

The invention discloses a redirection control method of a RedCAP terminal. And in the process of redirecting 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, adding the information of the NR cell B 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 redirection attempt to the confirmed common NR cell, ensures that the data service of the RedCAP terminal can not be intermittent and can keep continuity.

Description

RedCAP terminal and redirection control method thereof

Technical Field

The invention relates to a control method for Intra-radio access technology (Intra Radio Access Technology, intra-RAT) redirection and Inter-radio access technology (Inter Radio Access Technology, inter-RAT) redirection 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.

The redirection refers to that in a command for indicating the mobile terminal to change from a connection state to an idle state or an inactive state, the network designates a target frequency point for redirection, and after the mobile terminal enters the idle state or the inactive state, the network searches for a cell residence on the designated frequency point. If the designated frequency point and the current serving cell belong to the same radio access technology (Radio Access Technology, RAT), it is referred to as intra-radio access technology redirection, also known as intra-mode redirection, or intra-system redirection. If the designated frequency point and the current serving cell belong to different radio access technologies, the method is called inter-radio access technology redirection, also called inter-mode redirection, inter-system redirection, or inter-system redirection. Typical redirection is triggered by the mobile terminal reporting a measurement report of the cell on the target frequency point.

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 redirection procedure in the radio access technology of the existing RedCap terminal includes the following steps in sequence. 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 release (RRCRelease) message, where the redirect request info indicates the frequency point information of the target cell, indicating that the redirect terminal redirects 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 has some reason that the target cell of the redirection 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 redirect to this NR neighbor B within the radio access technology, but fails to redirect 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 redirection actions in the radio access technologies which are supposed to fail, and the RedCap terminal always searches cells because of continuous redirection failure, so that service initiation is difficult, the service process is time-to-time connected, and normal maintenance cannot be carried out.

Referring to fig. 2, the redirection procedure between radio access technologies of the existing 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 RRC connection release (RRCConnectionRelease) message instructing the RedCap multimode terminal to redirect 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 redirection criterion may be a 5G common NR cell.

Step B5: the RedCap multimode terminal attempts an inter-radio access technology redirection to the NR neighbor B but fails to redirect to the target cell B because it does not support RedCap terminal access.

Step B6: the RedCap multimode terminal searches for a suitable 5G RedCap cell in the NR mode. If the 5G RedCap cell is not successfully resided, the RedCap multimode terminal is switched to the LTE mode to try to search the network and reside in the 4G LTE cell, and the service connection can be reestablished by the original 4G LTE cell A or other LTE cells.

Steps B2-B6 are then repeated, which may be multiple times. The network side indicates that the RedCap multimode terminal always tries redirection behaviors among the radio access technologies which are appointed to fail, and the RedCap multimode terminal always searches cells because of continuous redirection failure, so that service initiation is difficult, the service process is disconnected, and normal maintenance cannot be 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 redirection control method of a RedCap terminal, which comprises the following steps. Step S1: and in the process of redirecting 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, adding the information of the NR cell B 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 redirection is an intra-radio access technology redirection; the step S1 is executed during the intra-radio access technology redirection 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.

Further, the redirection is an inter-radio access technology redirection; the step S1 is executed during the process of redirecting the radio access technology 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 executes the inter-system NR measurement configured by 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, in the step SA1, 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, said step S1 is performed during a first redirection of the RedCap terminal to any NR cell B.

The invention also provides a RedCAP terminal for realizing redirection control, which comprises a redirection failure recording unit and a redirection judgment executing unit. The redirection failure recording unit is used for adding the information of the NR cell B into a forbidden access list if the NR cell B is found not to allow the access of the RedCAP terminal in the process of redirecting the RedCAP terminal to any NR cell B. The redirection judging and executing unit is used for judging whether the NR neighbor cell currently exists in the forbidden access list or not if the NR neighbor cell meeting the measurement report is detected when the RedCAP terminal executes NR measurement configured on the 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 redirection attempt to the confirmed 5G common NR cell, and ensuring that the data service of the RedCAP terminal is not intermittent and continuous, so that the continuity can be maintained.

Drawings

Fig. 1 is a schematic diagram of a redirection procedure in a radio access technology of a conventional RedCap terminal.

Fig. 2 is a schematic diagram of a redirection procedure between radio access technologies of a conventional RedCap multimode terminal.

Fig. 3 is a flow chart of a redirection control method in radio access technology of a RedCap terminal according to the present invention.

Fig. 4 is a flow chart of a redirection control method between radio access technologies of the RedCap multimode terminal according to the present invention.

Fig. 5 is a schematic structural diagram of a RedCap terminal for implementing redirection control in a radio access technology according to the present invention.

Fig. 6 is a schematic structural diagram of a RedCap multimode terminal for implementing inter-radio access technology redirection control according to the present invention.

The reference numerals in the drawings illustrate: 1 is a redirection failure recording unit in the radio access technology, 2 is a redirection judging executing unit in the radio access technology, 3 is a redirection failure recording unit among the radio access technologies, and 4 is a redirection judging executing unit among the radio access technologies.

Detailed Description

Referring to fig. 3, the intra-radio access technology redirection 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 redirects from any 5G RedCAP cell A to any NR cell B in the wireless access technology, 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, 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 terminal determines that a certain NR cell B is a target cell from the 5G RedCap cell a through intra-radio access technology redirection (for example, first time), obtains downlink synchronization of the target cell B in an attempt 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 perform a normal intra-radio access technology redirection 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 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 redirection 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 redirection instruction, and the RedCAP terminal can execute unnecessary abnormal redirection. The RedCap terminal does not send the measurement report of the NR neighbor to the network so that the network will not issue the RedCap terminal a command to redirect in the radio access technology to the NR neighbor, and the RedCap terminal will continue to stay in the current 5G NR cell. The method avoids the complex and repeated flow of network searching caused by the failure of redirecting the RedCAP terminal 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 sending and subsequent redirection flow in the wireless access technology.

Referring to fig. 4, the method for controlling redirection between radio access technologies of the 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 redirects from any 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 multimode terminal can normally access 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 redirection (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 multimode terminal determines that the target cell B is a 5G RedCap cell, and the RedCap multimode terminal continues to perform a normal inter-radio access technology redirection procedure. If the parameter in SIB1 indicates that the NR cell B does not allow the access of the RedCAP terminal, the RedCAP multimode 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 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 SB1 the global cell identity of the original 4G LTE cell a where the redirection between radio access technologies to the 5G normal NR cell B was prior to, 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 is currently in the forbidden access list, even if the RedCAP multimode terminal sends a measurement report to the network, the network side can only send a redirection instruction, and the RedCAP multimode terminal executes unnecessary abnormal redirection. The RedCap multimode terminal does not send the measurement report of the NR neighbor to the network, so that the network will not issue a command to the RedCap multimode terminal to redirect between radio access technologies of the NR neighbor, and the RedCap multimode terminal continues to stay in the current 4G LTE cell. The complex and repeated flow of network searching caused by the redirection failure of the RedCAP multimode terminal to the NR neighbor cell is avoided, the data service of the RedCAP multimode terminal in a connection state is not interrupted, and 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 redirection flow among wireless access technologies.

Referring to fig. 5, the RedCap terminal for implementing intra-radio access technology redirection control according to the present invention includes an intra-radio access technology redirection failure recording unit 1 and an intra-radio access technology redirection judging executing unit 2. The apparatus shown in fig. 5 corresponds to the method shown in fig. 3.

The intra-radio access technology redirection failure recording unit 1 is configured to, in a process that the RedCap terminal redirects from any 5G RedCap cell a to any NR cell B in the radio access technology, add information of the NR cell B to a forbidden access list if the NR cell B is found not to allow the RedCap terminal to access.

And the redirection judging and executing unit 2 in the wireless access technology 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 NR measurement configured by the network side is executed by the RedCAP terminal 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 redirection control according to the present invention includes an inter-radio access technology redirection failure recording unit 3 and an inter-radio access technology redirection judging executing unit 4. The apparatus shown in fig. 6 corresponds to the method shown in fig. 4.

The inter-radio access technology redirection failure recording unit 3 is configured to, in a process of performing inter-radio access technology redirection from any 4G LTE cell a to any NR cell B by a RedCap multimode terminal, add information of the NR cell B to a forbidden access list if the NR cell B is found not to allow access of the RedCap terminal.

The inter-radio access technology redirection judging and executing unit 4 is configured to, when the RedCap multimode terminal executes a heterogeneous system NR measurement configured on a network side in an LTE connection state, judge whether the NR neighbor currently exists in a forbidden access list if a NR neighbor satisfying a measurement report is detected. 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 redirection 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 redirection 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 redirection control method of a RedCAP terminal is characterized by comprising the following steps of;

step S1: in the process that the RedCAP terminal redirects 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 redirection control method of the RedCap terminal of claim 1, wherein the redirection is an intra-radio access technology redirection; the step S1 is executed during the intra-radio access technology redirection 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 redirection control method of the RedCap terminal of claim 1, wherein the redirection is an inter-radio access technology redirection; the step S1 is executed during the process of redirecting the radio access technology 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 executes the inter-system NR measurement configured by the network side in the LTE connected state.

4. The redirection 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 method for redirecting control of a RedCap terminal according to claim 4, wherein in step SA1, the information added in the forbidden access list in step S1 further includes a global cell identifier of a source 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 redirection control method of the 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 redirection-control method for a RedCap terminal according to claim 2 or 3, characterized in that said step S1 is performed during the first redirection of the RedCap terminal to any NR cell B.

8. The RedCAP terminal for realizing redirection control is characterized by comprising a redirection failure recording unit and a redirection judgment executing unit;

the redirection failure recording unit is used for adding the information of the NR cell B into a forbidden access list if the NR cell B is found not to allow the access of the RedCAP terminal in the process of redirecting the RedCAP terminal to any NR cell B;

the redirection judging and executing unit is used for judging whether the NR neighbor cell currently exists in the forbidden access list or not if the NR neighbor cell meeting the measurement report is detected when the RedCAP terminal executes NR measurement configured on the 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.