RRC (Radio Resource Control) reestablishment network searching method, reestablishment method and device

Abstract

The invention provides an RRC (Radio Resource Control) reconstruction network searching method, a reconstruction method and a device, and the method comprises the steps: switching a cell type and a network type according to a network disconnection reason of a source cell and network equipment, and generating a network searching cell priority sequence of a target during RRC reconstruction; and cell selection is performed in the target network searching cell priority sequence, so that the user equipment quickly finds a proper cell to complete residence, the RRC reconstruction success rate and the reconstruction efficiency are improved, and the user service continuity is ensured.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to an RRC network search method, a reconstruction method, and a device. Background Art

[0002] In wireless communication networks, the Radio Resource Control (RRC) protocol manages radio resources, ensuring service continuity and network efficiency. RRC connection reestablishment is a key mechanism for rapidly restoring the connection between the network and user equipment (UE) after an abnormal disconnection. In terrestrial networks (such as NR / LTE) and wide-coverage satellite communication scenarios, handover failures are one of the main reasons for triggering RRC reestablishment.

[0003] Currently, when the UE performs RRC reestablishment after a handover failure, it needs to search for available cells in a fixed order of stored frequencies, sub-bands, and full-bands. This strategy relies on historical connection information and aims to reuse known network configurations to accelerate reestablishment. However, in complex wireless environments, the UE may not be able to rediscover the stored frequencies or cells, or the searched cells may not meet the residency conditions; the satellite base station needs to be configured with multiple synchronization signal block (SSB) beams, which significantly increases the time it takes for the UE to read the SSBs. If searching by sub-band / full-band, a large number of beams need to be traversed, further extending the reestablishment time. For the above reasons, if the reestablishment is not completed before the reestablishment timer expires, the UE will fall back to the RRC idle state (RRC_idle) to reestablish the connection, which significantly increases the time it takes to process and seriously affects the user experience.

[0004] The current fixed-priority cell search strategy is difficult to adapt to complex channel and network characteristics, which can easily lead to RRC reestablishment delays or failures. There is an urgent need to optimize the search priority logic, shorten reestablishment delays, and ensure service continuity. Summary of the Invention

[0005] One object of the present application is to provide an RRC reestablishment network search method, enabling a UE to quickly find a suitable cell to complete residency, thereby improving the RRC reestablishment success rate and reestablishment efficiency, and thus ensuring user service continuity. Another object of the present application is to provide an RRC reestablishment method. Another object of the present application is to provide an RRC reestablishment network search device. Another object of the present application is to provide an RRC reestablishment device. Another object of the present application is to provide a user equipment. Another object of the present application is to provide a network device. Yet another object of the present application is to provide a computer-readable medium. Yet another object of the present application is to provide a computer device. Yet another object of the present application is to provide a computer program product.

[0006] To achieve the above objectives, the present application discloses, on one hand, an RRC network reestablishment search method, which is applied to a user equipment, comprising:

[0007] Generate a target search cell priority sequence for RRC reestablishment based on the disconnection reason between the source cell and the network device, the handover cell type, and the network type;

[0008] Select a cell from the target search cell priority sequence.

[0009] In another embodiment of the present application, a target search cell priority sequence is generated during RRC reestablishment based on the disconnection reason between the source cell and the network device, the handover cell type, and the network type, including:

[0010] According to the network disconnection reason and the switching cell type, the target network search cell priority sequence is determined from the configured network type network search cell selection strategy, which includes the first priority sequence, the second priority sequence and the third priority sequence.

[0011] In another embodiment of the present application, the switching cell type is direct switching;

[0012] Based on the cause of the network disconnection and the handover cell type, the target search cell priority sequence is determined from the configured network type search cell selection policy, including:

[0013] If the network disconnection reason is the first sub-reason of the first failure reason, determining the target network search cell priority sequence from the first priority sequence;

[0014] If the network disconnection reason is the second sub-reason of the first failure reason, determining the target network search cell priority sequence from the second priority sequence;

[0015] The first failure cause is reconfiguration failure, the first sub-cause is uplink and downlink synchronization failure, and the second sub-cause is non-uplink and downlink synchronization failure.

[0016] In another embodiment of the present application, the switching cell type is conditional switching;

[0017] Based on the cause of the network disconnection and the handover cell type, the target search cell priority sequence is determined from the configured network type search cell selection policy, including:

[0018] If the disconnection reason is the first sub-reason of the second failure reason, the third failure reason, or the fourth failure reason, determining the target search cell priority sequence from the first priority sequence;

[0019] If the network disconnection reason is the second sub-reason of the second failure reason, determining the target network search cell priority sequence from the second priority sequence;

[0020] If the disconnection reason is the fifth failure reason, determine the target search cell priority sequence from the third priority sequence;

[0021] The second failure cause is conditional handover failure, the first sub-cause is uplink and downlink synchronization failure, and the second sub-cause is non-uplink and downlink synchronization failure;

[0022] The third failure reason is that the reconfiguration failed to enter the switching process;

[0023] The fourth failure reason is that the reconfiguration has failed after entering the switching process;

[0024] The fifth failure reason is wireless link failure.

[0025] In another embodiment of the present application, the first type of priority sequence includes a first network search cell priority sequence and a fourth network search cell priority sequence;

[0026] Determine the target search cell priority sequence from the first priority sequence, including:

[0027] If the network type is a terrestrial network, the first search cell priority sequence is determined as the target search cell priority sequence, and the first search cell priority sequence is the source cell, the handover target cell, the remaining stored frequency points, the sub-band, and the full band;

[0028] If the network type is a satellite network, the fourth network search cell priority sequence is determined as the target network search cell priority sequence, and the fourth network search cell priority sequence is the source cell, the switching target cell and the remaining preset frequency points.

[0029] In another embodiment of the present application, the second type of priority sequence includes a second network search cell priority sequence and a fifth network search cell priority sequence;

[0030] The target search cell priority sequence is determined from the second priority sequence, including:

[0031] If the network type is a terrestrial network, the second search cell priority sequence is determined as the target search cell priority sequence, and the second search cell priority sequence is the switching target cell, the source cell, the remaining stored frequency points, the sub-band, and the full band;

[0032] If the network type is a satellite network, the fifth network search cell priority sequence is determined as the target network search cell priority sequence, and the fifth network search cell priority sequence is the switching target cell, the source cell and the remaining preset frequency points.

[0033] In another embodiment of the present application, the third type of priority sequence includes a third network search cell priority sequence and a sixth network search cell priority sequence;

[0034] The target search cell priority sequence is determined from the third priority sequence, including:

[0035] If the network type is a terrestrial network, the third search cell priority sequence is determined as the target search cell priority sequence, and the third search cell priority sequence is the switching target cell, the remaining stored frequency point, the sub-band and the full band;

[0036] If the network type is a satellite network, the sixth network search cell priority sequence is determined as the target network search cell priority sequence, and the sixth network search cell priority sequence is the switching target cell and the remaining preset frequency points.

[0037] In another embodiment of the present application, performing cell selection in a target search cell priority sequence includes:

[0038] Traverse the cells in the target search cell priority sequence and detect the cell selection evaluation parameters;

[0039] If the cell selection evaluation parameter satisfies the cell residency condition, the corresponding cell is determined as the selected cell.

[0040] The present application also discloses an RRC re-establishment method, which is applied to a network device and includes:

[0041] Responding to the RRC re-establishment request sent by the user equipment, performing RRC re-establishment on the user equipment and the cell selected by the user equipment;

[0042] The selected cell is obtained by the user equipment through cell selection in the target network search cell priority sequence; the target network search cell priority sequence is generated by the user equipment according to the network disconnection reason, the handover cell type and the network type.

[0043] In another embodiment of the present application, performing RRC reestablishment on the user equipment and the cell selected by the user equipment includes:

[0044] Sending a reconfiguration message to the user equipment;

[0045] In response to the reconfiguration completion message returned by the user equipment, the RRC reestablishment is completed.

[0046] In another embodiment of the present application, the network device is a satellite-borne base station, and the method further includes:

[0047] In the initial stage of networking, frequencies are set according to a preset number and the set frequencies are sent to user equipment so that the user equipment can preset the received frequencies locally.

[0048] In another embodiment of the present application, the network device is a satellite-borne base station, and the method further includes:

[0049] Reduce the number of synchronization signal block beams according to the preset number threshold.

[0050] The present application also discloses an RRC network reestablishment search device, which is applied to a user equipment and includes:

[0051] A generating unit, configured to generate a target search cell priority sequence during RRC reestablishment based on the disconnection reason between the source cell and the network device, the switching cell type, and the network type;

[0052] The network search unit is used to select a cell in the target network search cell priority sequence.

[0053] The present application also discloses an RRC re-establishment device, which is applied to a network device and includes:

[0054] The network-side RRC reconstruction unit is used to respond to the RRC reconstruction request sent by the user equipment and perform RRC reconstruction on the user equipment and the cell selected by it; the selected cell is obtained by the user equipment through cell selection in the target network search cell priority sequence; the target network search cell priority sequence is generated by the user equipment according to the reason for network disconnection, the switching cell type and the network type.

[0055] The present application also discloses a user equipment, which includes:

[0056] at least one processor; and

[0057] At least one memory stores thereon instructions, which, when executed individually or collectively by at least one processor, cause the user equipment to perform the method described above.

[0058] The present application also discloses a network device, which is a satellite-borne base station or a ground-based base station; the network device includes:

[0059] at least one processor; and

[0060] At least one memory stores thereon instructions, which, when executed individually or collectively by at least one processor, cause the network device to perform the method described above.

[0061] The present application also discloses a computer-readable medium on which a computer program is stored. When the program is executed by a processor, the method described above is implemented.

[0062] The present application also discloses a computer device, including a memory and a processor, wherein the memory is used to store information including program instructions, the processor is used to control the execution of program instructions, and the processor implements the above method when executing the program.

[0063] The present application also discloses a computer program product, comprising a computer program / instruction, which implements the above method when executed by a processor.

[0064] This application generates a target search cell priority sequence during RRC reestablishment based on the disconnection reason between the source cell and the network device, the switching cell type, and the network type; selects a cell in the target search cell priority sequence, so that the UE can quickly find a suitable cell to complete the residency, improve the RRC reestablishment success rate and reestablishment efficiency, and thus ensure user service continuity. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0066] Figure 1 A signaling interaction diagram for UE switching base stations provided in one embodiment of the present application;

[0067] Figure 2 A signaling interaction diagram for RRC reestablishment provided in one embodiment of the present application;

[0068] Figure 3 A schematic diagram of the structure of an RRC network search system provided in one embodiment of the present application;

[0069] Figure 4 A schematic diagram of signaling interaction during a communication process between a UE and a network device is provided for one embodiment of the present application;

[0070] Figure 5 A flowchart of an RRC network search method for reestablishment provided in one embodiment of the present application;

[0071] Figure 6 A flowchart of an RRC reestablishment provided for one embodiment of the present application;

[0072] Figure 7 A signaling interaction diagram of an RRC reestablishment method applied to a satellite-borne base station provided in one embodiment of the present application;

[0073] Figure 8 A signaling interaction diagram of an RRC reestablishment method applied to a ground base station provided in one embodiment of the present application;

[0074] Figure 9 A schematic structural diagram of an RRC network search device provided in one embodiment of the present application;

[0075] Figure 10 A schematic structural diagram of another RRC re-establishment device provided in one embodiment of the present application;

[0076] Figure 11 A schematic diagram of the structure of a computer device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0077] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0078] To facilitate understanding of the technical solution provided by this application, the relevant contents of the technical solution of this application are first described below. Wireless communication networks need to use the RRC mechanism to efficiently manage and schedule limited wireless resources to ensure communication quality within the service area, while maximizing system service capacity and resource utilization efficiency. In the wireless protocol stack, the RRC sublayer is responsible for the management and control of wireless resources and is a key protocol layer for implementing wireless access control and mobility management. The RRC protocol involves multiple core processes in the connection control process, including paging, RRC connection setup, security activation, RRC connection reconfiguration, RRC connection re-establishment, and RRC connection release. Among them, the RRC connection re-establishment process is used to quickly restore the wireless connection after an abnormal disconnection between the network and the user equipment (UE), thereby effectively reducing the signaling overhead and latency required for re-access, and improving connection reliability and user experience. Whether in terrestrial cellular networks (such as 5G NR and LTE) or satellite communication networks, handover failure is one of the main reasons for triggering RRC connection reestablishment. Therefore, optimizing the handover mechanism and enhancing the stability of the RRC reestablishment process are of great significance to improving overall network performance.

[0079] Figure 1 A signaling interaction diagram of a UE switching base station provided in an embodiment of the present application is as follows: Figure 1As shown in Figure 1, the base station (gNodeB) consists of a distributed unit (gNodeB-DU) and a centralized unit (gNodeB-CU). The gNodeB-CU is responsible for centralized base station control functions, including baseband processing such as channel coding and modulation. The gNodeB-DU is responsible for radio frequency processing, including physical layer operations such as spectrum upconversion and power amplification, and directly connects to the active antenna unit (AAU). Multiple gNodeB-DUs can share a single gNodeB-CU, enabling joint networking through the standardized F1 interface.

[0080] like Figure 1 As shown, the UE sends a measurement report to the gNodeB-CU. When the UE detects that the signal quality of the current cell has deteriorated or the signal quality of the neighboring cell is better than that of the current cell, the UE sends a Measurement Report to the gNodeB-CU to inform the gNodeB-CU of the current measurement results.

[0081] After receiving the Measurement Report, the gNodeB-CU initiates a UE Context Modification Request to the gNodeB-DU based on the current network status and UE requirements. The gNodeB-DU responds to the UEContext Modification Request, modifies the UE context, and returns a UE Context Modification Response to the gNodeB-CU, confirming that the context has been modified.

[0082] The gNodeB-CU sends an RRC Reconfiguration Complete message to the UE. In response to the RRC Reconfiguration Complete message, the UE performs the corresponding handover procedure.

[0083] After the UE handover is completed, the gNodeB-CU sends a UE Context Release Command to the gNodeB-DU, causing the gNodeB-DU to release the resources related to the cell before the handover.

[0084] The gNodeB-CU sends an RRC Reconfiguration message to the UE. The UE performs reconfiguration in response to the RRCReconfiguration message and returns an RRC Reconfiguration Complete message.

[0085] In one embodiment of the present application, the RRC reconfiguration message may include a conditional handover configuration, which may include handover commands for up to 8 different target cells. Once the handover condition of a specific target cell is met, the UE will automatically execute the corresponding handover process. However, if the UE receives a new RRC reconfiguration message carrying a handover information element before the conditional handover configuration takes effect, the UE will immediately delete all previous conditional handover configurations and perform the handover operation according to the latest RRC reconfiguration message. This mechanism ensures that in the case of dynamic network changes, the UE can respond to the latest network instructions in a timely manner to ensure the continuity and stability of communication.

[0086] UE will initiate RRC reestablishment after handover failure. Figure 2 A signaling interaction diagram of RRC reconstruction provided by an embodiment of the present application is as follows: Figure 2 As shown, after the UE detects a connection problem by monitoring signaling or link status, it sends an RRC Reestablishment Request (RRC Restablishment Request) to the network device and simultaneously starts timer T311. Timer T311 is used to limit the time the UE performs cell selection and reestablishment. During timer T311, the UE determines a cell that meets the cell selection criteria based on the stored frequency, sub-band, and full-band priorities, camps on the determined cell, and reestablishes an RRC connection with the determined cell. In response to the RRC Restablishment Request, the network device sends an RRC Reestablishment (RRC Restablishment) message to the UE. The RRC Restablishment message carries the resource information and configuration parameters allocated by the network device to the UE. In response to the RRC Restablishment, the UE completes the corresponding configuration based on the resource information and configuration parameters and returns an RRC Configuration Complete (RRC Restablishment Complete) message to the network device. The network device responds with an RRC Restablishment Complete message, confirming that the UE has successfully completed the RRC reestablishment process, and that communication and uplink and downlink services can be carried out between the network device and the UE.

[0087] If the camped cell is still not determined after the timer T311 expires, the RRC reestablishment process is exited and the RRC enters the idle state. At this time, if communication between the network device and the UE is to be established, an RRC establishment is required.

[0088] It is worth noting that the time required for RRC establishment is longer than that for RRC reestablishment. Compared with RRC reestablishment, RRC establishment will lead to a poor user experience and cannot guarantee service continuity.

[0089] This application optimizes the cell selection process in the RRC reconstruction process in the handover failure scenario. By adjusting the priority order of searching network device cells, the UE can quickly determine a suitable cell to reside in, complete RRC reconstruction, and ensure the continuity of user services.

[0090] It is worth noting that the RRC network reconstruction search method of the present application is applicable to terrestrial networks and satellite networks. The network equipment corresponding to the terrestrial network is a ground base station, and the network equipment corresponding to the satellite network is a satellite-borne base station.

[0091] Figure 3 A schematic diagram of the structure of an RRC network search system provided in one embodiment of the present application is shown as follows: Figure 3 As shown, the RRC network reestablishment search system 100 includes a network device 110 and a UE 120. The network device 110 and the UE 120 are communicatively connected to each other and can perform uplink and downlink service interaction.

[0092] The network device 110 is a satellite-borne base station or a ground-based base station; the network device 110 includes: at least one processor; and at least one memory storing instructions, which, when executed by the at least one processor alone or together, enable the network device 110 to execute Figures 5 to 8 Either method.

[0093] It is worth noting that the network device in the embodiment of the present application is a base station device that supports wireless communication protocols, and the present application does not limit its specific implementation form, manufacturer and model.

[0094] UE 120 includes at least one processor; and at least one memory storing instructions thereon, which, when executed individually or collectively by the at least one processor, cause UE 120 to execute Figures 5 to 8 Either method.

[0095] It is worth noting that the UE in the embodiment of the present application is a terminal device with communication capabilities, and the present application does not make any specific restrictions on its manufacturer, model, etc.

[0096] Figure 4 A schematic diagram of signaling interaction in a communication process between a UE and a network device is provided as an embodiment of the present application, such as Figure 4 As shown, in the initial stage, the UE is powered on and performs a network search to determine a suitable cell to camp on, and enters an idle state after successfully camping on it.

[0097] The UE establishes an RRC connection with the network device and enters the connected state. The process of establishing an RRC connection includes but is not limited to: authentication and security (AS) activation, UE capability query, RRC reconfiguration, measurement report, and RRC reconfiguration for cell switching. AS security activation is used to ensure the security of data transmission; UE capability query is used to ensure that the network device obtains the UE's capability information to optimize resource configuration; RRC reconfiguration is a configuration message sent by the network device to adjust the UE's parameter settings according to network requirements; Measurement Report is a report on the current network status that the UE periodically transmits to the network device; RRC reconfiguration for cell switching is when the network device initiates an RRC reconfiguration command to the UE when cell switching is required.

[0098] After the RRC connection is successfully established and stabilized, the user can perform services through the UE, such as data transmission and voice calls. Specifically, the UE interacts with the network equipment for uplink and downlink services. The uplink and downlink service interaction process includes sending uplink and downlink service requests, performing service processing in response to uplink and downlink service requests, and returning uplink and downlink service processing completion messages.

[0099] When an abnormal event occurs, the UE triggers the RRC reestablishment process. Abnormal events include, but are not limited to, reconfiguration failure, handover failure, and radio link failure. Reconfiguration failure occurs when the UE fails to successfully execute the RRC reconfiguration command issued by the network device; handover failure occurs when an abnormality occurs during cell handover, leading to a handover failure; and radio link failure occurs when the radio link between the UE and the network device is interrupted.

[0100] During the RRC reconstruction process, the UE applies the RRC reconstruction network search method provided in this application to search for network device cells, quickly determine a suitable cell and complete the residency; the UE re-establishes the RRC connection with the network device to which the determined cell belongs, resumes normal communication, and enters the connected state.

[0101] After RRC reestablishment is successful and stable, users can perform services through the UE, such as data transmission and voice calls. Specifically, the UE and network equipment exchange uplink and downlink services. The uplink and downlink service interaction process includes sending uplink and downlink service requests, performing service processing in response to uplink and downlink service requests, and returning an uplink and downlink service processing completion message. At this point, uplink and downlink services between the UE and the network equipment are restored.

[0102] In the technical solution provided in the present application, a target search cell priority sequence is generated during RRC reconstruction based on the reason for disconnection between the source cell and the network device, the switching cell type, and the network type; cell selection is performed in the target search cell priority sequence, so that the UE can quickly find a suitable cell to complete the residency, thereby improving the RRC reconstruction success rate and reconstruction efficiency, thereby ensuring user service continuity.

[0103] It is worth mentioning that Figure 3 The RRC reconstruction network search system shown and Figure 4 The communication process between the UE and the network device shown is also applicable to Figures 5 to 8 Either method will not be described here.

[0104] Figure 5 A flowchart of an RRC network search method provided in an embodiment of the present application is applied to a UE, such as Figure 5 As shown, the method includes:

[0105] Step 101: Generate a target search cell priority sequence for RRC reestablishment based on the disconnection reason between the source cell and the network device, the handover cell type, and the network type.

[0106] The network type is a terrestrial network or a satellite network. The network equipment corresponding to the terrestrial network is a ground base station, and the network equipment corresponding to the satellite network is a satellite base station.

[0107] In one embodiment of the present application, a target network search cell priority sequence is determined from a configured network type network search cell selection policy according to the network disconnection reason and the handover information element type.

[0108] Specifically, when the network connection is disconnected from the source cell under the network device, the target search cell priority sequence is determined based on the disconnection reason and the switching cell type matched with the disconnection reason and the switching cell type in the configured network type search cell selection policy.

[0109] The network search cell selection strategy includes a first priority sequence, a second priority sequence, and a third priority sequence. The network search cell selection strategy is pre-configured.

[0110] The reasons for network disconnection include but are not limited to the first failure reason, the second failure reason, the third failure reason, the fourth failure reason and the fifth failure reason. The first failure reason and the second failure reason both include the first sub-reason and the second sub-reason.

[0111] The switching information element type is the type of switching information element carried in the reconfiguration message sent by the network device. The switching information element type includes direct switching or conditional switching. Direct switching means that the UE directly performs cell switching in response to the reconfiguration message carrying the switching information element. Conditional switching means that the UE responds to the reconfiguration message carrying the switching information element to determine whether the current state meets the switching conditions carried in the switching information element. If so, the UE performs cell switching; if not, the UE temporarily does not perform cell switching until the switching conditions are met.

[0112] In one embodiment of the present application, if the handover cell type is direct handover and the network disconnection cause is the first sub-cause of the first failure cause, a target network search cell priority sequence is determined from a first priority sequence. The first failure cause is reconfiguration failure, and the first sub-cause is uplink and downlink synchronization failure. The first priority sequence includes a first network search cell priority sequence and a fourth network search cell priority sequence.

[0113] Specifically, if the network type is a terrestrial network, the first search cell priority sequence is determined as the target search cell priority sequence, and the first search cell priority sequence is the source cell, the switching target cell, the remaining stored frequency points, the sub-band and the full band.

[0114] Among them, the first failure reason is that the UE in the connected state receives a reconfiguration message carrying a switching information element, and the reconfiguration fails, resulting in RRC reconstruction. If the reconfiguration failure is caused by the failure of uplink and downlink synchronization, it means that the signal quality of the switching target cell is poor, resulting in the UE being unable to access smoothly. In order to improve the efficiency and success rate of RRC reconstruction, the first search cell priority sequence is configured as the source cell, the switching target cell, the remaining stored frequencies, the sub-band and the full band, that is: the ground network attempts to select the cell in the order of priority of the source cell, the switching target cell, the remaining stored frequencies, the sub-band and the full band. The remaining stored frequencies are dynamically stored by the UE based on the interaction with the ground network.

[0115] Specifically, if the network type is a satellite network, the fourth network search cell priority sequence is determined as the target network search cell priority sequence, and the fourth network search cell priority sequence is the source cell, the switching target cell and the remaining preset frequency points.

[0116] Among them, the first failure reason is that the UE in the connected state receives a reconfiguration message carrying a handover information element, and the reconfiguration fails, resulting in RRC reconstruction. If the reconfiguration failure is caused by uplink and downlink synchronization failure, it means that the signal quality of the handover target cell is poor, resulting in the UE being unable to access smoothly. In order to improve the efficiency and success rate of RRC reconstruction, the fourth search cell priority sequence is configured as the source cell, the handover target cell, and the remaining preset frequency points, that is, the satellite network source cell, the handover target cell, and the remaining preset frequency points are prioritized to try cell selection. The remaining preset frequency points are preset in the UE in advance based on the frequency points included in the satellite network.

[0117] In another embodiment of the present application, if the handover cell type is direct handover and the disconnection cause is the second sub-cause of the first failure cause, a target network search cell priority sequence is determined from a second priority sequence. The first failure cause is reconfiguration failure, and the second sub-cause is non-uplink / downlink synchronization failure. The second priority sequence includes a second network search cell priority sequence and a fifth network search cell priority sequence.

[0118] Specifically, if the network type is a terrestrial network, the second search cell priority sequence is determined as the target search cell priority sequence, and the second search cell priority sequence is the switching target cell, the source cell, the remaining stored frequency points, the sub-band and the full band.

[0119] Among them, the first failure reason is that the UE in the connected state receives a reconfiguration message carrying a switching information element, and the reconfiguration fails, resulting in RRC reconstruction. If the reconfiguration failure is caused by non-uplink and downlink synchronization failure, it means that the UE cannot access smoothly because of the poor signal quality of the switching target cell. In order to improve the efficiency and success rate of RRC reconstruction, the second search cell priority sequence is configured to the switching target cell, source cell, remaining stored frequencies, sub-bands and full bands, that is: the ground network attempts cell selection in the order of priority of the switching target cell, source cell, remaining stored frequencies, sub-bands and full bands. Among them, the reasons for non-uplink and downlink synchronization failure include but are not limited to: configuration failure. The remaining stored frequencies are dynamically stored by the UE based on the interaction with the ground network.

[0120] Specifically, if the network type is a satellite network, the fifth network search cell priority sequence is determined as the target network search cell priority sequence, and the fifth network search cell priority sequence is the switching target cell, the source cell and the remaining preset frequency points.

[0121] Among them, the first failure reason is that the UE in the connected state receives a reconfiguration message carrying a switching information element, and the reconfiguration fails, resulting in RRC reconstruction. If the reconfiguration failure is caused by non-uplink and downlink synchronization failure, it means that the UE cannot access smoothly because of the poor signal quality of the switching target cell. In order to improve the efficiency and success rate of RRC reconstruction, the fifth search cell priority sequence is configured to the switching target cell, the source cell and the remaining preset frequencies, that is: the satellite network attempts cell selection in the order of priority of the switching target cell, the source cell and the remaining preset frequencies. Among them, the reasons for non-uplink and downlink synchronization failure include but are not limited to: configuration failure. The remaining preset frequencies are preset in the UE in advance based on the frequencies contained in the satellite network.

[0122] In one embodiment of the present application, if the handover cell type is conditional handover and the disconnection cause is the first sub-cause, third failure cause, or fourth failure cause of the second failure cause, the target network search cell priority sequence is determined from the first priority sequence. The second failure cause is conditional handover failure, the first sub-cause is uplink and downlink synchronization failure, the third failure cause is failure to perform reconfiguration without entering the handover process, and the fourth failure cause is failure to perform reconfiguration after entering the handover process. The first priority sequence includes a first network search cell priority sequence and a fourth network search cell priority sequence.

[0123] Specifically, if the network type is a terrestrial network, the first search cell priority sequence is determined as the target search cell priority sequence, and the first search cell priority sequence is the source cell, the switching target cell, the remaining stored frequency points, the sub-band and the full band.

[0124] Among them, the second failure reason is that the UE in the connected state receives a reconfiguration message carrying a switching information element. The switching information element carries the switching conditions. When the switching conditions are met, the cell switching fails, resulting in RRC reconstruction. If the cell switching failure is caused by uplink and downlink synchronization failure, it means that the signal quality of the switching target cell is poor, resulting in the UE being unable to access smoothly. In order to improve the efficiency and success rate of RRC reconstruction, the first search cell priority sequence is configured as the source cell, the switching target cell, the remaining stored frequencies, the sub-band and the full band, that is: the ground network attempts to select the cell in the order of priority of the source cell, the switching target cell, the remaining stored frequencies, the sub-band and the full band. The remaining stored frequencies are dynamically stored by the UE based on the interaction with the ground network.

[0125] Among them, the third failure reason is that the UE in the connected state receives a reconfiguration message carrying a switching information element. The switching information element carries the switching conditions. The reconfiguration fails before entering the switching process, resulting in RRC reconstruction. This means that the UE believes that the configuration carried in the reconfiguration message is invalid. Only the conditional switching configuration is met on the network equipment side, which does not mean that the signal quality of the switching target cell is better than that of the source cell, and the source cell is in an available state. In order to improve the efficiency and success rate of RRC reconstruction, the first search cell priority sequence is configured as the source cell, the switching target cell, the remaining stored frequencies, the sub-band and the full band, that is: the ground network attempts to select the cell in the order of priority of the source cell, the switching target cell, the remaining stored frequencies, the sub-band and the full band. The remaining stored frequencies are dynamically stored by the UE based on the interaction with the ground network.

[0126] Among them, the fourth failure reason is that the UE in the connected state receives a reconfiguration message carrying a switching information element, and the switching information element carries the switching conditions. The UE enters the switching process and receives a reconfiguration message carrying a switching information element. The UE deletes the reconfiguration message received before and executes the latest received reconfiguration message, but the reconfiguration fails to execute, resulting in RRC reconstruction, indicating that the UE is not sure whether the signal quality of the switching target cell meets the cell residence conditions, that is: the UE is not sure whether the switching target cell is in an available state, and the UE can determine that the source cell is in an available state. In order to improve the efficiency and success rate of RRC reconstruction, the first search cell priority sequence is configured as the source cell, the switching target cell, the remaining stored frequencies, the sub-band and the full band, that is: the ground network attempts to select the cell in the order of priority of the source cell, the switching target cell, the remaining stored frequencies, the sub-band and the full band. The remaining stored frequencies are dynamically stored by the UE based on the interaction with the ground network.

[0127] Specifically, if the network type is a satellite network, the fourth network search cell priority sequence is determined as the target network search cell priority sequence, and the fourth network search cell priority sequence is the source cell, the switching target cell and the remaining preset frequency points.

[0128] Among them, the second failure reason is that the UE in the connected state receives a reconfiguration message carrying a handover information element. The handover information element carries the handover conditions. When the handover conditions are met, the cell handover fails, resulting in RRC reconstruction. If the cell handover failure is caused by uplink and downlink synchronization failure, it means that the signal quality of the handover target cell is poor, resulting in the UE being unable to access smoothly. In order to improve the efficiency and success rate of RRC reconstruction, the fourth search cell priority sequence is configured as the source cell, the handover target cell and the remaining preset frequency points, that is, the satellite network source cell, the handover target cell and the remaining preset frequency points are used to try cell selection in order of priority. The remaining preset frequency points are preset in the UE in advance based on the frequency points included in the satellite network.

[0129] Among them, the third failure reason is that the UE in the connected state receives a reconfiguration message carrying a handover information element. The handover information element carries the handover conditions. The reconfiguration fails before entering the handover process, resulting in RRC reconstruction. This means that the UE believes that the configuration carried in the reconfiguration message is invalid. Only the network equipment side meets the conditional handover configuration, which does not mean that the signal quality of the handover target cell is better than that of the source cell, and the source cell is in an available state. In order to improve the efficiency and success rate of RRC reconstruction, the fourth search cell priority sequence is configured as the source cell, the handover target cell and the remaining preset frequencies, that is, the satellite network source cell, the handover target cell and the remaining preset frequencies are used to try cell selection. The remaining preset frequencies are preset in the UE in advance based on the frequencies contained in the satellite network.

[0130] Among them, the fourth failure reason is that the UE in the connected state receives a reconfiguration message carrying a switching information element, the switching information element carries the switching conditions, the UE has entered the switching process, and receives a reconfiguration message carrying a switching information element. The UE deletes the reconfiguration message received before and executes the latest reconfiguration message received, but the reconfiguration fails to execute, resulting in RRC reconstruction, indicating that the UE is not sure whether the signal quality of the switching target cell meets the cell residence conditions, that is: the UE is not sure whether the switching target cell is in an available state, and the UE can determine that the source cell is in an available state. In order to improve the efficiency and success rate of RRC reconstruction, the fourth search cell priority sequence is configured as the source cell, the switching target cell and the remaining preset frequencies, that is: the satellite network source cell, the switching target cell and the remaining preset frequencies are tried in order of priority. The remaining preset frequencies are preset in the UE in advance based on the frequencies contained in the satellite network.

[0131] In another embodiment of the present application, if the handover cell type is conditional handover and the disconnection cause is the second sub-cause of the second failure cause, a target network search cell priority sequence is determined from a second priority sequence. The second failure cause is conditional handover failure, and the second sub-cause is non-uplink / downlink synchronization failure. The second priority sequence includes a second network search cell priority sequence and a fifth network search cell priority sequence.

[0132] Specifically, if the network type is a terrestrial network, the second search cell priority sequence is determined as the target search cell priority sequence, and the second search cell priority sequence is the switching target cell, the source cell, the remaining stored frequency points, the sub-band and the full band.

[0133] Among them, the second failure reason is that the UE in the connected state receives a reconfiguration message carrying a switching information element, and the switching information element carries the switching conditions. When the switching conditions are met, the cell switching fails, resulting in RRC reconstruction. If the reconfiguration failure is caused by non-uplink and downlink synchronization failure, it means that the UE cannot access smoothly because of the poor signal quality of the switching target cell. In order to improve the efficiency and success rate of RRC reconstruction, the second search cell priority sequence is configured to the switching target cell, source cell, remaining stored frequencies, sub-bands and full bands, that is: the ground network attempts cell selection in the order of priority of the switching target cell, source cell, remaining stored frequencies, sub-bands and full bands. Among them, the reasons for non-uplink and downlink synchronization failure include but are not limited to: configuration failure. The remaining stored frequencies are dynamically stored by the UE based on the interaction with the ground network.

[0134] Specifically, if the network type is a satellite network, the fifth network search cell priority sequence is determined as the target network search cell priority sequence, and the fifth network search cell priority sequence is the switching target cell, the source cell and the remaining preset frequency points.

[0135] Among them, the second failure reason is that the UE in the connected state receives a reconfiguration message carrying a switching information element, and the switching information element carries the switching conditions. When the switching conditions are met, the cell switching fails, resulting in RRC reconstruction. If the reconfiguration failure is caused by non-uplink and downlink synchronization failure, it means that the UE cannot access smoothly because of the poor signal quality of the switching target cell. In order to improve the efficiency and success rate of RRC reconstruction, the fifth search cell priority sequence is configured to the switching target cell, the source cell and the remaining preset frequencies, that is: the satellite network attempts to select cells in the order of priority of the switching target cell, the source cell and the remaining preset frequencies. Among them, the reasons for non-uplink and downlink synchronization failure include but are not limited to: configuration failure. The remaining preset frequencies are preset in the UE in advance based on the frequencies contained in the satellite network.

[0136] In one embodiment of the present application, if the handover cell type is conditional handover and the disconnection cause is the fifth failure cause, a target search cell priority sequence is determined from a third priority sequence. The fifth failure cause is a radio link failure. The third priority sequence includes a third search cell priority sequence and a sixth search cell priority sequence.

[0137] Specifically, if the network type is a terrestrial network, the third network search cell priority sequence is determined as the target network search cell priority sequence, and the third network search cell priority sequence is the switching target cell, the remaining stored frequency point, the sub-band and the full band.

[0138] Among them, the fifth failure reason is that the UE in the connected state receives a reconfiguration message carrying a switching information element. The switching information element carries the switching conditions. The UE currently does not meet the switching conditions and does not trigger the cell switching. The RRC is rebuilt due to the failure of the wireless link, which means that the signal quality of the source cell is poor and the signal quality of the switching target cell is high. In order to improve the efficiency and success rate of RRC reconstruction, the third search cell priority sequence is configured to the switching target cell, the remaining stored frequencies, the sub-band and the full band, that is: the ground network attempts to select the cell in the order of priority of the switching target cell, the remaining stored frequencies, the sub-band and the full band. The remaining stored frequencies are dynamically stored by the UE based on the interaction with the ground network.

[0139] Specifically, if the network type is a satellite network, the sixth network search cell priority sequence is determined as the target network search cell priority sequence, and the sixth network search cell priority sequence is the switching target cell and the remaining preset frequency points.

[0140] Among them, the fifth failure reason is that the UE in the connected state receives a reconfiguration message carrying a handover information element. The handover information element carries the handover conditions. The UE currently does not meet the handover conditions and does not trigger the cell handover. The RRC is rebuilt due to the failure of the wireless link, indicating that the signal quality of the source cell is poor and the signal quality of the handover target cell is high. In order to improve the efficiency and success rate of RRC reconstruction, the sixth search cell priority sequence is configured to the handover target cell and the remaining preset frequency points, that is, the satellite network attempts cell selection in the order of priority of the handover target cell and the remaining preset frequency points. The remaining preset frequency points are preset in the UE in advance based on the frequency points included in the satellite network.

[0141] The specific configuration of the target search cell priority sequence in the RRC reestablishment process in the ground network is shown in Table 1:

[0142] Table 1

[0143]

[0144] Compared with the priority order of cell selection according to stored frequency, sub-band, and full-band in the traditional RRC reconstruction process, this application further optimizes the cell selection strategy, preliminarily judges the signal quality of the source cell and the switching target cell based on the cause of the network disconnection, optimizes the priority order of cell selection, and can adapt to complex channels and network characteristics, so that the UE can quickly determine the resident cell and complete RRC reconstruction, thereby improving the success rate and efficiency of RRC reconstruction, thereby ensuring user service continuity.

[0145] It is worth noting that the reasons for the network disconnection that trigger the RRC reestablishment process include but are not limited to the reasons described in Table 1 above.

[0146] The specific configuration of the target search cell priority sequence in the RRC reestablishment process in the satellite network is shown in Table 2:

[0147] Table 2

[0148]

[0149] Compared with the priority order of cell selection according to stored frequency, sub-band, and full-band in the traditional RRC reconstruction process, this application further optimizes the cell selection strategy, preliminarily judges the signal quality of the source cell and the switching target cell based on the cause of the network disconnection, optimizes the priority order of cell selection, and can adapt to complex channels and network characteristics, so that the UE can quickly determine the resident cell and complete RRC reconstruction, thereby improving the success rate and efficiency of RRC reconstruction, thereby ensuring user service continuity.

[0150] It is worth noting that the reasons for the network disconnection that trigger the RRC reestablishment process include but are not limited to the reasons described in Table 1 above.

[0151] Step 102: Select a cell in the target search cell priority sequence.

[0152] Figure 6 A flowchart of RRC reconstruction is provided for one embodiment of the present application, such as Figure 6 As shown, step 102 specifically includes:

[0153] Step 1021: traverse the cells in the target search cell priority sequence and detect the cell selection evaluation parameters.

[0154] In one embodiment of the present application, the UE detects the cell selection evaluation parameters of the target cells in descending order of priority according to the priority sequence of the target cells to be searched, wherein the cell selection evaluation parameters include a cell selection level value and a cell selection quality value.

[0155] Specifically, the UE detects the reference signal received power (RSRP) of the cell and calculates the cell selection level value of the cell using the following formula:

[0156]

[0157] in, is the cell level value; The RSRP value detected by the UE; The minimum power required for a UE to access a cell, expressed in decibel milliwatts (dBm); The offset of the minimum power required for UE to access the cell; Temporary offset for UE access; is the compensation value, in decibels (dB); The maximum uplink transmit power allowed by the UE; is the UE capability power.

[0158] Specifically, the UE detects the reference signal received quality (RSRQ) of the cell and calculates the cell selection quality value of the cell using the following formula:

[0159]

[0160] in, Selecting a quality value for the cell; Detect the RSRQ value for the UE; is the cell signal quality threshold; is the offset of the cell signal quality threshold; A temporary offset for network device access.

[0161] Step 1022: Determine whether the cell selection evaluation parameters meet the cell residency conditions. If so, proceed to step 1023; if not, proceed to step 1021.

[0162] In one embodiment of the present application, the cell residence condition is that both the cell selection level value and the cell selection quality value are greater than 0.

[0163] Specifically, if the calculated cell selection level value and the cell selection quality value are both greater than 0, it indicates that the cell residence conditions are met, and the UE can reside in the current cell, and step 1023 is continued; if at least one of the calculated cell selection level value and the cell selection quality value is less than or equal to 0, it indicates that the cell residence conditions are not met, and the UE cannot reside in the current cell, and step 1021 is continued until a cell that meets the cell residence conditions is determined.

[0164] When performing cell selection, the RSRP and RSRQ measured by the UE are variable values. The larger the RSRP and RSRQ values ​​are, the more likely it is that the cell residence conditions will be met, so that the cell selection and residence can be completed quickly, and the time required for RRC reconstruction can be shortened. The values ​​of RSRP and RSRQ are directly related to the signal reception power. The higher the signal reception power, the higher the RSRP and RSRQ values. Therefore, it is easier for the source cell and the switching target cell where the UE is located to achieve RRC reconstruction of the UE. In the network search cell selection strategy configured in this application, the priority of the source cell and the switching target cell is configured before the remaining stored frequencies, sub-bands and full bands, and the signal quality of the source cell and the switching target cell where the terminal is located is judged according to the reason for the network disconnection, the switching cell type and the network type, the priority between the source cell and the switching target cell is configured, and the cell with better signal quality is selected for RRC reconstruction.

[0165] Step 1023: Determine the corresponding cell as the selected cell.

[0166] In one embodiment of the present application, the cell that meets the cell camping condition is a cell with good signal quality, and the corresponding cell is determined as the cell selected by the UE to camp on.

[0167] Step 103: Perform RRC reestablishment with the selected cell through the network device.

[0168] Step 103 specifically includes:

[0169] Step 1031: Send an RRC re-establishment request to the network device to which the corresponding cell belongs.

[0170] In one embodiment of the present application, the UE sends an RRC re-establishment request to a network device to which the area of ​​the cell meeting the cell camping condition belongs.

[0171] Step 1032: Complete RRC re-establishment in response to the reconfiguration message returned by the network device.

[0172] In one embodiment of the present application, the network device responds to the RRC re-establishment request and returns a reconfiguration message to the UE, where the reconfiguration message carries resource information and configuration parameters allocated to the UE by the network device; the UE responds to the reconfiguration message, completes the corresponding configuration according to the resource information and configuration parameters, and returns an RRC configuration completion message to the network device to complete the RRC re-establishment.

[0173] In the technical solution provided in the present application, a target search cell priority sequence is generated during RRC reconstruction based on the reason for disconnection between the source cell and the network device, the switching cell type, and the network type; cell selection is performed in the target search cell priority sequence, so that the UE can quickly find a suitable cell to complete the residency, thereby improving the RRC reconstruction success rate and reconstruction efficiency, thereby ensuring user service continuity.

[0174] Figure 7 A signaling interaction diagram of an RRC reestablishment method applied to a satellite base station is provided in one embodiment of the present application, such as Figure 7 As shown, the method includes:

[0175] Step 201: In the initial stage of networking, frequency points are set according to a preset number, and the set frequency points are sent to the UE, so that the UE can preset the received frequency points locally.

[0176] In the early stage of satellite networking, a preset number of frequencies are set for networking and sent to the UE. The UE presets the received frequencies locally. When the RRC reestablishment between the source cell and the target cell fails, the UE searches for cells in the remaining preset frequencies.

[0177] In one embodiment of the present application, the preset number of frequencies depends on the number of frequencies of the satellite base station. If RRC reestablishment occurs in the current cell, the preset number of frequencies can be set to the union of the frequencies used by all cells that currently meet the signal quality requirements.

[0178] Step 202: In response to the RRC Restablishment Request sent by the UE, perform RRC reestablishment between the UE and the cell selected by the UE.

[0179] In one embodiment of the present application, after disconnecting the network from the UE, the satellite-borne base station receives the RRCR establishment request sent by the UE and allocates resource information and configuration parameters to the UE according to the selected cell.

[0180] The selected cell is selected by the UE from the target network search cell priority sequence; the target network search cell priority sequence is generated by the UE according to the network disconnection reason, the handover cell type and the network type.

[0181] It is worth noting that the specific process of generating the target search cell priority sequence and the specific process of cell selection are described in steps 101 and 102 and will not be described in detail here.

[0182] Step 2021: Send RRC Reconfiguration to the UE.

[0183] In one embodiment of the present application, the satellite-borne base station returns an RRC Reconfiguration message to the UE, where the RRC Reconfiguration message carries resource information and configuration parameters allocated by the satellite-borne base station to the UE.

[0184] Step 2022: In response to the RRC Reconfiguration Complete signal returned by the UE, the RRC reconfiguration is completed.

[0185] In one embodiment of the present application, the satellite-borne base station receives the RRC ReconfigurationComplete sent by the UE, confirming that the UE has successfully completed the RRC reconfiguration.

[0186] Furthermore, the number of synchronization signal block (SSB) beams is reduced according to a preset number threshold.

[0187] According to the 3GPP protocol, the maximum number of SSB beams in the sub-6 GHz (Sub6G) frequency band, as defined in the fifth-generation mobile communication technology (5G-NR) new radio access technology standard, is 8, and the maximum number of SSB beams in the millimeter-wave band is 64. In the initial stages of satellite networks, due to the small number of satellites and the large area each satellite needs to serve, some satellites' onboard base stations have a large number of SSB beams. As the density of satellite cells increases, it is necessary to limit the number of SSB beams to no more than the 3GPP protocol limit. This reduces the time it takes for UEs to receive SSB beams, accelerates the RRC re-establishment process in satellite networks, and improves the success rate of RRC re-establishment, thereby ensuring service continuity for users.

[0188] In one embodiment of the present application, when the satellite cell density reaches a preset density threshold, the number of current SSB beams is reduced according to a preset number threshold. The density threshold and number threshold can be set based on actual needs, with the requirement that the number of SSB beams after reduction does not exceed the number specified in the 3GPP protocol.

[0189] Figure 8 A signaling interaction diagram of an RRC reestablishment method applied to a ground base station is provided in one embodiment of the present application, such as Figure 8 As shown, the method includes:

[0190] Step 301: In response to the RRC Restablishment Request sent by the UE, perform RRC reestablishment between the UE and the cell selected by the UE.

[0191] In one embodiment of the present application, after disconnecting the network from the UE, the ground base station receives the RRCR establishment request sent by the UE and allocates resource information and configuration parameters to the UE according to the selected cell.

[0192] The selected cell is selected by the UE from the target network search cell priority sequence; the target network search cell priority sequence is generated by the UE according to the network disconnection reason, the handover cell type and the network type.

[0193] It is worth noting that the specific process of generating the target search cell priority sequence and the specific process of cell selection are described in steps 101 and 102 and will not be described in detail here.

[0194] Step 3011: Send RRC Reconfiguration to the UE.

[0195] In one embodiment of the present application, the ground base station returns a reconfiguration message to the UE, and the RRC Reconfiguration message carries resource information and configuration parameters allocated to the UE by the space-borne base station.

[0196] Step 3012: In response to the RRC Reconfiguration Complete signal returned by the UE, the RRC reconfiguration is completed.

[0197] In one embodiment of the present application, the ground base station receives the RRC ReconfigurationComplete sent by the UE, confirming that the UE has successfully completed the RRC reconfiguration.

[0198] It is worth noting that the acquisition, storage, use, and processing of data in the technical solutions of this application are in compliance with the relevant provisions of laws and regulations. The user information in the embodiments of this application is obtained through legal and compliant channels, and the acquisition, storage, use, and processing of user information are authorized and agreed by the customer.

[0199] It is worth noting that the information collected in this application is information and data authorized by the user or fully authorized by all parties, and the collection, storage, use, processing, transmission, provision, disclosure and application of relevant data comply with the relevant laws, regulations and standards of relevant countries and regions, take necessary confidentiality measures, do not violate public order and good customs, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0200] It is worth noting that the technical solution provided in this application provides users with corresponding operation entrances for them to choose to agree or reject the automated decision-making results; if the user chooses to reject, the expert decision-making process will be entered.

[0201] Figure 9 A schematic diagram of the structure of an RRC network search device provided in an embodiment of the present application is applied to a user equipment, and the device is used to execute the above-mentioned RRC network search method. Figure 9 As shown, the device includes: a generating unit 11 and a network searching unit 12.

[0202] The generating unit 11 is used to generate a target search cell priority sequence during RRC reestablishment according to the disconnection reason between the source cell and the network device, the switching cell type and the network type.

[0203] The network search unit 12 is used to select a cell in the target network search cell priority sequence.

[0204] In another embodiment of the present application, the generation unit 11 is specifically used to determine the target network search cell priority sequence from the configured network type network search cell selection strategy based on the network disconnection reason and the switching cell type, and the network search cell selection strategy includes a first type priority sequence, a second type priority sequence and a third type priority sequence.

[0205] In another embodiment of the present application, the switching cell type is direct switching; the generation unit 11 is specifically used to determine the target network search cell priority sequence from the first type of priority sequence if the network disconnection cause is the first sub-cause of the first failure cause; if the network disconnection cause is the second sub-cause of the first failure cause, determine the target network search cell priority sequence from the second type of priority sequence; the first failure cause is reconfiguration failure, the first sub-cause is uplink and downlink synchronization failure, and the second sub-cause is non-uplink and downlink synchronization failure.

[0206] In another embodiment of the present application, the switching cell type is conditional switching; the generation unit 11 is specifically used to determine the target network search cell priority sequence from the first priority sequence if the network disconnection cause is the first sub-cause of the second failure cause, the third failure cause or the fourth failure cause; if the network disconnection cause is the second sub-cause of the second failure cause, determine the target network search cell priority sequence from the second priority sequence; if the network disconnection cause is the fifth failure cause, determine the target network search cell priority sequence from the third priority sequence; the second failure cause is conditional switching failure, the first sub-cause is uplink and downlink synchronization failure, and the second sub-cause is non-uplink and downlink synchronization failure; the third failure cause is failure to execute reconfiguration without entering the switching process; the fourth failure cause is failure to execute reconfiguration after entering the switching process; the fifth failure cause is wireless link failure.

[0207] In another embodiment of the present application, the first type of priority sequence includes a first network search cell priority sequence and a fourth network search cell priority sequence; the generation unit 11 is also specifically used to determine the first network search cell priority sequence as the target network search cell priority sequence if the network type is a terrestrial network, and the first network search cell priority sequence is the source cell, the switching target cell, the remaining stored frequency points, the sub-band and the full band; if the network type is a satellite network, the fourth network search cell priority sequence is determined as the target network search cell priority sequence, and the fourth network search cell priority sequence is the source cell, the switching target cell and the remaining preset frequency points.

[0208] In another embodiment of the present application, the second type of priority sequence includes a second network search cell priority sequence and a fifth network search cell priority sequence; the generation unit 11 is also specifically used to determine the second network search cell priority sequence as the target network search cell priority sequence if the network type is a terrestrial network, and the second network search cell priority sequence is the switching target cell, source cell, remaining stored frequency points, sub-band and full frequency band; if the network type is a satellite network, the fifth network search cell priority sequence is determined as the target network search cell priority sequence, and the fifth network search cell priority sequence is the switching target cell, source cell and remaining preset frequency points.

[0209] In another embodiment of the present application, the third type of priority sequence includes a third network search cell priority sequence and a sixth network search cell priority sequence; the generation unit 11 is also specifically used to determine the third network search cell priority sequence as the target network search cell priority sequence if the network type is a terrestrial network, and the third network search cell priority sequence is the switching target cell, the remaining stored frequency points, the sub-band and the full frequency band; if the network type is a satellite network, the sixth network search cell priority sequence is determined as the target network search cell priority sequence, and the sixth network search cell priority sequence is the switching target cell and the remaining preset frequency points.

[0210] In another embodiment of the present application, the network search unit 12 is specifically configured to traverse cells in the target network search cell priority sequence and detect cell selection evaluation parameters; if the cell selection evaluation parameters meet the cell residency condition, the corresponding cell is determined as the selected cell.

[0211] In the solution of the present application, a target search cell priority sequence is generated during RRC reconstruction based on the reason for disconnection between the source cell and the network device, the switching cell type, and the network type; cell selection is performed in the target search cell priority sequence, so that the UE can quickly find a suitable cell to complete the residency, thereby improving the RRC reconstruction success rate and reconstruction efficiency, thereby ensuring user service continuity.

[0212] Figure 10 A schematic structural diagram of another RRC reconstruction device provided in an embodiment of the present application is applied to a network device, the network device being a satellite base station or a ground base station; the device is used to perform the above-mentioned RRC reconstruction method, such as Figure 10 As shown, the device includes: a network side RRC reconstruction unit 31.

[0213] The network-side RRC reconstruction unit 31 is used to respond to the RRC reconstruction request sent by the user equipment and perform RRC reconstruction on the user equipment and the cell selected by it; the selected cell is obtained by the user equipment through cell selection in the target network search cell priority sequence; the target network search cell priority sequence is generated by the user equipment based on the reason for network disconnection, the switching cell type and the network type.

[0214] In another embodiment of the present application, the network-side RRC reconstruction unit 31 is specifically configured to send a reconfiguration message to the user equipment; and complete the RRC reconstruction in response to a reconfiguration completion message returned by the user equipment.

[0215] In another embodiment of the present application, the network device is a satellite-borne base station, and the apparatus further includes: a frequency point preset unit 32 .

[0216] The frequency preset unit 32 is used to set frequencies according to a preset number in the initial stage of networking, and send the set frequencies to the user equipment so that the user equipment can preset the received frequencies locally.

[0217] In another embodiment of the present application, the network device is a satellite-borne base station, and the apparatus further includes: a beam defining unit 33 .

[0218] The beam limiting unit 33 is used to reduce the number of synchronization signal block beams according to a preset number threshold.

[0219] In the solution of the present application, a target search cell priority sequence is generated during RRC reconstruction based on the reason for disconnection between the source cell and the network device, the switching cell type, and the network type; cell selection is performed in the target search cell priority sequence, so that the UE can quickly find a suitable cell to complete the residency, thereby improving the RRC reconstruction success rate and reconstruction efficiency, thereby ensuring user service continuity.

[0220] The systems, devices, modules, or units described in the above embodiments may be implemented by computer chips or entities, or by products having certain functions. A typical implementation device is a computer device. Specifically, the computer device may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0221] An embodiment of the present application provides a computer device including a memory and a processor, wherein the memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions. When the program instructions are loaded and executed by the processor, the steps of the embodiment of the above method are implemented. For a specific description, please refer to the embodiment of the above method.

[0222] Reference below Figure 11 , which shows a structural diagram of a computer device 600 suitable for implementing an embodiment of the present application.

[0223] like Figure 11 As shown, computer device 600 includes a central processing unit (CPU) 601, which can perform various appropriate tasks and processes according to programs stored in a read-only memory (ROM) 602 or programs loaded from a storage unit 608 into a random access memory (RAM) 603. Various programs and data required for the operation of computer device 600 are also stored in RAM 603. CPU 601, ROM 602, and RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to bus 604.

[0224] The following components are connected to the I / O interface 605: an input section 606 including a keyboard, mouse, and the like; an output section 607 including devices such as a cathode ray tube (CRT), a liquid crystal display (LCD), and speakers; a storage section 608 including devices such as a hard disk; and a communication section 609 including a network interface card such as a LAN card or a modem. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. Removable media 611, such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory, is installed in the drive 610 as needed, so that computer programs read from the media can be installed in the storage section 608 as needed.

[0225] In particular, according to embodiments of the present application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present application include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for executing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via the communication portion 609 and / or installed from a removable medium 611.

[0226] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can be implemented using any method or technology for information storage. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change RAM (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media such as modulated data signals and carrier waves.

[0227] For the convenience of description, the above devices are described as being divided into various units according to their functions. Of course, when implementing this application, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0228] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0229] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0230] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0231] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0232] The acquisition, storage, use, and processing of data in this application's technical solution comply with relevant national laws and regulations.

[0233] It should be noted that in the embodiments of the present application, certain software, components, models and other existing solutions in the industry may be mentioned. They should be regarded as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present application, but it does not mean that the applicant has or will necessarily use the solution.

[0234] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0235] The present application may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The present application may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communications network. In a distributed computing environment, program modules may be located in local and remote computer storage media, including storage devices.

[0236] The various embodiments in this specification are described in a progressive manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiments are generally similar to the method embodiments, so the description is relatively simple. For relevant parts, refer to the description of the method embodiments.

[0237] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A RRC network reestablishment search method, characterized in that: Applied to user equipment, the method includes: Generate a target search cell priority sequence for RRC reestablishment based on the disconnection reason between the source cell and the network device, the handover cell type, and the network type; A cell selection is performed in the target search cell priority sequence.

2. The RRC network search method according to claim 1, wherein: Generate a target search cell priority sequence for RRC reestablishment based on the disconnection reason between the source cell and the network device, the handover cell type, and the network type, including: According to the network disconnection reason and the switching cell type, a target network search cell priority sequence is determined from the configured network type network search cell selection strategy, and the network search cell selection strategy includes a first priority sequence, a second priority sequence and a third priority sequence.

3. The RRC network search method according to claim 2, wherein: The switching cell type is direct switching; The determining, based on the network disconnection reason and the handover cell type, a target network search cell priority sequence from a configured network type network search cell selection strategy includes: If the network disconnection reason is the first sub-reason of the first failure reason, determining the target network search cell priority sequence from the first priority sequence; If the network disconnection reason is the second sub-reason of the first failure reason, determining the target network search cell priority sequence from the second priority sequence; The first failure cause is reconfiguration failure, the first sub-cause is uplink and downlink synchronization failure, and the second sub-cause is non-uplink and downlink synchronization failure.

4. The RRC network search method according to claim 2, wherein: The switching cell type is conditional switching; The determining, based on the network disconnection reason and the handover cell type, a target network search cell priority sequence from a configured network type network search cell selection strategy includes: If the network disconnection reason is the first sub-reason of the second failure reason, the third failure reason, or the fourth failure reason, determining the target network search cell priority sequence from the first priority sequence; If the network disconnection reason is the second sub-reason of the second failure reason, determining the target network search cell priority sequence from the second priority sequence; If the network disconnection reason is the fifth failure reason, determining the target network search cell priority sequence from the third priority sequence; The second failure cause is conditional handover failure, the first sub-cause is uplink and downlink synchronization failure, and the second sub-cause is non-uplink and downlink synchronization failure; The third failure reason is failure to enter the switching process and perform reconfiguration; The fourth failure reason is that the reconfiguration has failed after entering the switching process; The fifth failure reason is wireless link failure.

5. The RRC network search method according to claim 3 or 4, wherein: The first type of priority sequence includes a first network search cell priority sequence and a fourth network search cell priority sequence; The determining the target network search cell priority sequence from the first priority sequence includes: If the network type is a terrestrial network, the first network search cell priority sequence is determined as the target network search cell priority sequence, where the first network search cell priority sequence is the source cell, the handover target cell, the remaining stored frequency points, the sub-band, and the full band; If the network type is a satellite network, the fourth network search cell priority sequence is determined as the target network search cell priority sequence, and the fourth network search cell priority sequence is the source cell, the handover target cell and the remaining preset frequency points.

6. The RRC network search method according to claim 3 or 4, characterized in that: The second type of priority sequence includes a second network search cell priority sequence and a fifth network search cell priority sequence; The determining the target network search cell priority sequence from the second priority sequence includes: If the network type is a terrestrial network, the second network search cell priority sequence is determined as the target network search cell priority sequence, where the second network search cell priority sequence is the handover target cell, the source cell, the remaining stored frequency points, the sub-band, and the full band; If the network type is a satellite network, the fifth network search cell priority sequence is determined as the target network search cell priority sequence, and the fifth network search cell priority sequence is the switching target cell, the source cell and the remaining preset frequency points.

7. The RRC network search method according to claim 4, wherein: The third type of priority sequence includes a third network search cell priority sequence and a sixth network search cell priority sequence; Determining the target network search cell priority sequence from the third priority sequence includes: If the network type is a terrestrial network, the third network search cell priority sequence is determined as the target network search cell priority sequence, and the third network search cell priority sequence is the switching target cell, the remaining stored frequency point, the sub-band and the full band; If the network type is a satellite network, the sixth network search cell priority sequence is determined as the target network search cell priority sequence, and the sixth network search cell priority sequence is the switching target cell and the remaining preset frequency points.

8. The RRC network search method according to claim 1, wherein: The performing of cell selection in the target search cell priority sequence includes: Traversing the cells in the target search cell priority sequence and detecting cell selection evaluation parameters; If the cell selection evaluation parameter satisfies the cell residency condition, the corresponding cell is determined as the selected cell.

9. An RRC re-establishment method, characterized in that: Applied to a network device, the method further includes: In response to the RRC re-establishment request sent by the user equipment, performing RRC re-establishment on the user equipment and the cell selected by the user equipment; The selected cell is obtained by the user equipment through cell selection in the target network search cell priority sequence; the target network search cell priority sequence is generated by the user equipment according to the network disconnection reason, the switching cell type and the network type.

10. The RRC re-establishment method according to claim 9, wherein: The performing RRC reestablishment on the user equipment and the cell selected by the user equipment includes: Sending a reconfiguration message to the user equipment; In response to the reconfiguration completion message returned by the user equipment, the RRC reestablishment is completed.

11. The RRC reestablishment method according to claim 9, wherein: The network device is a satellite-borne base station, and the method further includes: In the initial stage of networking, frequencies are set according to a preset number and the set frequencies are sent to user equipment so that the user equipment can preset the received frequencies locally.

12. The RRC reestablishment method according to any one of claims 9 to 11, characterized in that: The network device is a satellite-borne base station, and the method further includes: Reduce the number of synchronization signal block beams according to the preset number threshold.

13. An RRC network search device, characterized in that: Applied to user equipment, the apparatus includes: A generating unit, configured to generate a target search cell priority sequence during RRC reestablishment based on the disconnection reason between the source cell and the network device, the switching cell type, and the network type; The network search unit is used to select a cell in the priority sequence of the target network search cell.

14. An RRC re-establishment device, characterized in that: Applied to network equipment, the device includes: The network-side RRC reconstruction unit is used to respond to the RRC reconstruction request sent by the user equipment to perform RRC reconstruction on the user equipment and the cell selected by it; the selected cell is obtained by the user equipment through cell selection in the target network search cell priority sequence; the target network search cell priority sequence is generated by the user equipment according to the network disconnection reason, the switching cell type and the network type.

15. A user equipment, characterized in that: The user equipment includes: at least one processor; and At least one memory stores thereon instructions, which, when executed individually or collectively by the at least one processor, cause the user equipment to perform the method according to any one of claims 1 to 8.

16. A network device, characterized in that: The network device is a satellite-borne base station or a ground-based base station; the network device includes: at least one processor; and At least one memory stores thereon instructions, which, when executed individually or collectively by the at least one processor, cause the network device to perform the method according to any one of claims 9 to 12.

17. A computer readable medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the RRC re-establishment network search method according to any one of claims 1 to 8 or the RRC re-establishment method according to any one of claims 9 to 12 is implemented.

18. A computer device comprising a memory and a processor, wherein the memory is used to store information including program instructions, and the processor is used to control the execution of the program instructions, wherein: When the program instructions are loaded and executed by the processor, the RRC re-establishment network search method according to any one of claims 1 to 8 or the RRC re-establishment method according to any one of claims 9 to 12 is implemented.

19. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by a processor, the RRC re-establishment network search method according to any one of claims 1 to 8 or the RRC re-establishment method according to any one of claims 9 to 12 is implemented.

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