CN117221967A - Cell switching method and device, storage medium and electronic device - Google Patents
Cell switching method and device, storage medium and electronic device Download PDFInfo
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Abstract
The application discloses a cell switching method and device, a storage medium and an electronic device, wherein the method comprises the following steps: and under the condition that the user terminal is determined to be subjected to cell switching, sending a switching request message to a target cell, and under the condition that a request confirmation message fed back by the target cell based on the switching request message is received, sending an RRC reconfiguration message to the user terminal through an air interface so as to trigger the user terminal to switch from a source cell to the target cell by using double connection switching, wherein the request confirmation message at least carries information of supporting double connection switching by the target cell, and the double connection switching is used for indicating that the source cell and the target cell are simultaneously connected with the user terminal in the switching process and supporting data receiving and transmitting of the user terminal. By adopting the technical scheme, the problems of communication interruption and the like in the process of switching the user terminal from the source cell to other target cells in the related technology are solved.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a cell handover method and apparatus, a storage medium, and an electronic device.
Background
In a conventional 4GLTE (Long-term evolution, LTE) network and 5GNR (new radio, NR) network until Release15, a UE (user equipment, UE) typically releases a connection from a source cell before establishing a connection with a target cell, resulting in a communication break between the UE and a base station of several tens of milliseconds. This interruption is a very critical issue for using 5G low latency, high reliability scenarios.
Aiming at the problems of communication interruption and the like in the process of switching the user terminal from the source cell to other target cells in the related technology, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the application provides a cell switching method and device, a storage medium and an electronic device, which at least solve the problems of communication interruption and the like in the process of switching a user terminal from a source cell to other target cells in the related technology.
According to an embodiment of the present application, there is provided a method for switching cells, including: under the condition that the user terminal is determined to be subjected to cell switching, a switching request message is sent to a target cell, wherein the switching request message is used for indicating switching resources required by the target cell when the target cell cuts into the user terminal connected with a source cell; and under the condition that a request confirmation message fed back by the target cell based on the switching request message is received, an RRC reconfiguration message is sent to the user terminal through an air interface so as to trigger the user terminal to switch from the source cell to the target cell by using dual-connection switching, wherein the request confirmation message at least carries information of supporting dual-connection switching by the target cell, and the dual-connection switching is used for indicating that the source cell and the target cell are allowed to be simultaneously connected with the user terminal in the switching process and supporting data receiving and transmitting of the user terminal.
Optionally, before sending the handover request message to the target cell, the method further includes: determining a measurement report of a user terminal connected to the source cell; and determining whether the user terminal needs to perform cell switching according to the measurement report and RRM information corresponding to the source cell and the user terminal.
Optionally, after sending an RRC reconfiguration message to the user terminal over the air interface to trigger the user terminal to switch from the source cell to the target cell using dual connectivity handover, the method further comprises: allocating a sequence code of a PDCP data packet for supporting data synchronization to a downlink corresponding to the user terminal; determining a forwarding result of the user terminal for forwarding the sequence code and the data service unit corresponding to the downlink to the target cell; and under the condition that the target cell receives the RRC reconfiguration completion message sent by the user terminal and the forwarding result indicates that forwarding is successful, determining that switching is completed, and stopping distributing the sequence code to the downlink.
Optionally, after sending an RRC reconfiguration message to the user terminal over the air interface to trigger the user terminal to switch from the source cell to the target cell using dual connectivity handover, the method further comprises: under the condition that a handover success message sent by the target cell is received, sending a notification message that the target cell is successfully accessed to the user terminal; acquiring the synchronous condition of the DL/UL data of the source cell and the target cell corresponding to the user terminal after receiving the notification message; and determining that the current source cell allows the cell release operation to be performed under the condition that the synchronization condition indicates that the synchronization is completed.
Optionally, after sending an RRC reconfiguration message to the user terminal over the air interface to trigger the user terminal to switch from the source cell to the target cell using dual connectivity handover, the method further comprises: receiving an operation command corresponding to the dual-connection switching sent by the user terminal; and determining a first connection mode of the source cell and the user terminal and a second connection mode of the source cell and the target device according to the operation command, wherein the first connection mode is used for indicating that the source cell is continuously connected with the user terminal when the source cell does not receive a handover success message sent by the target device, and the second connection mode is used for indicating that the source cell is continuously connected with the user terminal when the target cell does not receive the RRC reconfiguration completion message.
According to still another embodiment of the present application, there is provided another cell handover method, including: under the condition that the user terminal is determined to be subjected to cell switching, feeding back a corresponding request confirmation message to a source cell according to a switching request message sent by the source cell, so as to instruct the user terminal to perform double-connection switching between the source cell and the target cell based on the request confirmation message; the request message is used for indicating switching resources required by a target cell when the target cell cuts into a user terminal connected with a source cell, the request confirmation message at least carries information of the target cell supporting dual-connection switching, and the dual-connection switching is used for indicating that the source cell and the target cell are allowed to be simultaneously connected with the user terminal in a switching process and supporting data receiving and transmitting of the user terminal.
Optionally, the method further comprises: acquiring a switching result of the user terminal from the source cell to the target cell by using dual-connection switching; and sending a handover success message to the source cell when the handover result indicates that the handover is successful.
According to another embodiment of the present application, there is also provided a handover apparatus for a cell, including: the first sending module is used for sending a switching request message to a target cell under the condition that the user terminal is determined to be subjected to cell switching, wherein the switching request message is used for indicating switching resources required by the target cell when the target cell cuts into the user terminal connected with a source cell; and the second sending module is used for sending an RRC reconfiguration message to the user terminal through an air interface under the condition that a request confirmation message fed back by the target cell based on the switching request message is received, so as to trigger the user terminal to switch from the source cell to the target cell by using double connection switching, wherein the request confirmation message at least carries information of supporting double connection switching by the target cell, and the double connection switching is used for indicating that the source cell and the target cell are allowed to be simultaneously connected with the user terminal in the switching process and supporting data receiving and transmitting of the user terminal.
According to another embodiment of the present application, there is provided a handover apparatus for another cell, including: the feedback module is used for feeding back a corresponding request confirmation message to the source cell according to a switching request message sent by the source cell under the condition that the user terminal is determined to be subjected to cell switching, so as to instruct the user terminal to perform double-connection switching between the source cell and the target cell based on the request confirmation message; the request message is used for indicating switching resources required by a target cell when the target cell cuts into a user terminal connected with a source cell, the request confirmation message at least carries information of the target cell supporting dual-connection switching, and the dual-connection switching is used for indicating that the source cell and the target cell are allowed to be simultaneously connected with the user terminal in a switching process and supporting data receiving and transmitting of the user terminal.
According to yet another aspect of the embodiments of the present application, there is also provided a computer readable storage medium having a computer program stored therein, wherein the computer program is configured to perform the above-described cell handover method when run.
According to still another aspect of the embodiments of the present application, there is further provided an electronic device including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the cell handover method described above through the computer program.
In the embodiment of the application, the dual-connection switching flow is executed after the user terminal is connected with the source cell and the target cell, so that the user terminal can ensure the sending and receiving processing of the user data corresponding to the user terminal by the source cell under the condition that the switching is not completely finished in the process of switching from the source cell to the target cell. By adopting the embodiment, the problems of communication interruption and the like in the process of switching the user terminal from the source cell to other target cells in the related technology are solved, the situation that communication interruption does not occur in switching among different cells is ensured, the stability and the reliability of the communication process are greatly improved, and the technical effect of reducing the communication delay is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
Fig. 1 is a hardware block diagram of a device terminal of a cell handover method according to an embodiment of the present application;
fig. 2 is a flowchart of a handover method of a cell according to an embodiment of the present application;
fig. 3 is a flow chart of another method of cell handover according to an embodiment of the present application;
FIG. 4 is an application scenario diagram of a NR-based method of optimizing handoff delays according to an embodiment of the present application;
fig. 5 is a schematic diagram of a DCHO handover procedure according to an embodiment of the present application;
fig. 6 is a block diagram of a handover apparatus of a cell according to an embodiment of the present application;
fig. 7 is a block diagram of a handover apparatus of another cell according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The method embodiment provided by the embodiment of the application can be executed in a device terminal, a mobile terminal or similar computing devices. Taking the operation on the device terminal as an example, fig. 1 is a block diagram of a hardware structure of the device terminal of a cell handover method according to an embodiment of the present application. As shown in fig. 1, the device terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, and in one exemplary embodiment, the device terminal may further include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the configuration shown in fig. 1 is merely illustrative and is not intended to limit the configuration of the device terminals described above. For example, the device terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than the equivalent functions shown in fig. 1 or more than the functions shown in fig. 1.
The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to a cell handover method in an embodiment of the present application, and the processor 102 executes the computer program stored in the memory 104 to perform various functional applications and data processing, that is, implement the above-mentioned method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located with respect to the processor 102, which may be connected to the device terminal through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used to receive or transmit data via a network. The specific example of the network described above may include a wireless network provided by a communication provider of the device terminal. In one example, the transmission device 106 includes a network adapter (NIC) that may be connected to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module for communicating with the internet wirelessly.
In this embodiment, a cell handover method is provided and applied to the above device terminal, and fig. 2 is a flowchart of a cell handover method according to an embodiment of the present application, as shown in fig. 2, where the flowchart includes the following steps:
step S202, under the condition that the user terminal is determined to be subjected to cell switching, a switching request message is sent to a target cell, wherein the switching request message is used for indicating switching resources required by the target cell when the target cell cuts into the user terminal connected with a source cell;
step S204, when receiving a request acknowledgement message fed back by the target cell based on the handover request message, sending an RRC reconfiguration message to the ue through an air interface to trigger the ue to switch from the source cell to the target cell using dual connectivity handover, where the request acknowledgement message carries at least information that the target cell supports dual connectivity handover, and the dual connectivity handover is used to instruct that the source cell and the target cell are allowed to connect to the ue simultaneously in a handover process, and support data transceiving for the ue.
Through the steps, after the user terminal is connected with the source cell and the target cell, the double-connection switching flow is executed, so that the user terminal can ensure the sending and receiving processing of the user data corresponding to the user terminal by the source cell under the condition that the switching is not completed completely in the process of switching from the source cell to the target cell. By adopting the embodiment, the problems of communication interruption and the like in the process of switching the user terminal from the source cell to other target cells in the related technology are solved, the situation that communication interruption does not occur in switching among different cells is ensured, the stability and the reliability of the communication process are greatly improved, and the technical effect of reducing the communication delay is realized.
As an optional implementation manner, before sending the handover request message to the target cell, the method further includes: determining a measurement report of a user terminal connected to the source cell; and determining whether the user terminal needs to perform cell switching according to the measurement report and RRM information corresponding to the source cell and the user terminal.
It can be understood that, to ensure that the ue can continuously ensure communication connection with the cell with higher communication quality, when sending the handover request message to the target cell, the communication quality between the ue and the current source cell is determined by acquiring a measurement report of the ue connected to the source cell, and the effective condition and the reliable condition of the current source cell are determined by RRM (radio resource management, RRM) information corresponding to the source cell, and then the determined communication quality is compared with the preset communication quality of the ue, and whether the effective condition and the reliable condition of the current source cell meet the minimum communication requirement of the ue is determined, for example, when the communication quality is lower than the preset quality, and/or the current source cell cannot meet the minimum communication requirement of the ue, the current ue needs to perform cell handover to perform residence by switching and adjusting to the cell with better communication effect.
Optionally, after sending an RRC reconfiguration message to the user terminal over the air interface to trigger the user terminal to switch from the source cell to the target cell using dual connectivity handover, the method further comprises: allocating a sequence code of a PDCP data packet for supporting data synchronization to a downlink corresponding to the user terminal; determining a forwarding result of the user terminal for forwarding the sequence code and the data service unit corresponding to the downlink to the target cell; and under the condition that the target cell receives the RRC reconfiguration completion message sent by the user terminal and the forwarding result indicates that forwarding is successful, determining that switching is completed, and stopping distributing the sequence code to the downlink.
That is, when the ue performs handover between the target cell and the source cell, a migration path needs to be established between the target cell and the source cell in the handover preparation process, and the source cell is responsible for allocating downlink pdcppsns (corresponding to the above sequence code) until SN allocation is handed over to the target cell and data forwarding. That is, the source cell does not stop assigning pdcps to downlink packets until it receives a handoff success message and sends an SN status transmission message to the target cell; when the source cell allocates a downlink pdcchs, the source cell begins scheduling downlink data on the source cell radio link and begins forwarding downlink pdcsdu pdcp service data units along with the specified pdcchs to the target cell; then, in case of successful forwarding and complete RRC reconfiguration by the user terminal, the allocation of sequence codes to the downlink will be stopped.
During the handover, the user terminal receives user data from both the source cell and the target cell, and the corresponding PDCP packet data convergence protocol layer is reconfigured as a generic PDCP entity for the user plane protocol stacks of the source cell and the target cell. To ensure sequential delivery of user data, the continuity of PDCP Sequence Numbers (SNs) will be maintained throughout the handover procedure. Thus, one common (for source and target) reordering and duplication function is provided in a single PDCP entity. Ciphering/deciphering and header compression/decompression need to be processed separately in a common PDCP entity depending on the source/destination of downlink/uplink data packets.
Optionally, after sending an RRC reconfiguration message to the user terminal over the air interface to trigger the user terminal to switch from the source cell to the target cell using dual connectivity handover, the method further comprises: under the condition that a handover success message sent by the target cell is received, sending a notification message that the target cell is successfully accessed to the user terminal; acquiring the synchronous condition of the DL/UL data of the source cell and the target cell corresponding to the user terminal after receiving the notification message; and determining that the current source cell allows the cell release operation to be performed under the condition that the synchronization condition indicates that the synchronization is completed.
When determining that the user terminal can transmit data on the target cell, the target cell sends a corresponding notification message to the source cell, and then when the source cell interacts with the user terminal, the corresponding notification message indicates that the data in the source cell are synchronized to the target cell, at this time, a release operation can be performed on the source cell, that is, synchronization of uploading (DL)/downloading (UL) data between the source cell and the target cell is determined, and then after the user terminal is switched to the target cell, data tasks between the source cell and the target cell can be smoothly executed, and continuity of communication of the user terminal is ensured. In short, the user terminal can release the communication interaction with the source cell, and can ensure the continuation of the communication only by interacting with the target cell.
Optionally, after sending an RRC reconfiguration message to the user terminal over the air interface to trigger the user terminal to switch from the source cell to the target cell using dual connectivity handover, the method further comprises: receiving an operation command corresponding to the dual-connection switching sent by the user terminal; and determining a first connection mode of the source cell and the user terminal and a second connection mode of the source cell and the target device according to the operation command, wherein the first connection mode is used for indicating that the source cell is continuously connected with the user terminal when the source cell does not receive a handover success message sent by the target device, and the second connection mode is used for indicating that the source cell is continuously connected with the user terminal when the target cell does not receive the RRC reconfiguration completion message.
That is, when the ue receives the prompt of the source cell and determines that the cell needs to be switched, the ue ensures that the current handover is controlled by the ue by issuing a corresponding operation command.
In this embodiment, another cell handover method is provided and applied to the above device terminal, and fig. 3 is a flowchart of another cell handover method according to an embodiment of the present application, as shown in fig. 3, where the flowchart includes the following steps:
step S302, under the condition that the user terminal is determined to be subjected to cell switching, corresponding request confirmation information is fed back to a source cell according to switching request information sent by the source cell, so that the user terminal is indicated to perform double-connection switching between the source cell and a target cell based on the request confirmation information; the request message is used for indicating switching resources required by a target cell when the target cell cuts into a user terminal connected with a source cell, the request confirmation message at least carries information of the target cell supporting dual-connection switching, and the dual-connection switching is used for indicating that the source cell and the target cell are allowed to be simultaneously connected with the user terminal in a switching process and supporting data receiving and transmitting of the user terminal.
Through the steps, after the user terminal is connected with the source cell and the target cell, the double-connection switching flow is executed, so that the user terminal can ensure the sending and receiving processing of the user data corresponding to the user terminal by the source cell under the condition that the switching is not completed completely in the process of switching from the source cell to the target cell. By adopting the embodiment, the problems of communication interruption and the like in the process of switching the user terminal from the source cell to other target cells in the related technology are solved, the situation that communication interruption does not occur in switching among different cells is ensured, the stability and the reliability of the communication process are greatly improved, and the technical effect of reducing the communication delay is realized.
Optionally, the method further comprises: acquiring a switching result of the user terminal from the source cell to the target cell by using dual-connection switching; and sending a handover success message to the source cell when the handover result indicates that the handover is successful.
As an alternative implementation manner, there is provided in this embodiment a further cell handover method, which is characterized in that it is applied to a user terminal, and the method includes: the receiving source cell sends RRC reconfiguration information through an air interface; triggering a flow of dual connectivity handover between the source cell and the target cell using the RRC reconfiguration message; and determining to disconnect the communication with the source cell under the condition that a successful message of switching sent by the target cell to the source cell is received from a communication channel corresponding to the source cell by the user terminal.
In practical applications, the source cell corresponds to a source base station, and the target cell corresponds to a target base station to be handed over.
In order to better understand the procedure of the cell handover method, the following description is given with reference to the alternative embodiment to implement the cell handover method flow, but the method is not limited to the technical solution of the embodiment of the present application.
In this embodiment, a method for optimizing handover delay based on NR is provided, fig. 4 is an application scenario diagram of the method for optimizing handover delay based on NR according to an embodiment of the present application, as shown in fig. 4, in order to support DCHO (dual connectivity handover, abbreviated as DCHO), a UE must keep dual connectivity in an active state. One user plane protocol stack of the target cell contains PHY (physical), MAC (medium access control) and RLC (radio link control) layers while keeping the second user plane protocol stack active for transmitting and receiving user data in the source cell.
The UE receives user data from both the source and target cells, and a PDCP (packet data convergence protocol) layer is reconfigured as a generic PDCP entity for both the source and target user plane protocol stacks. To ensure sequential delivery of user data, the continuity of PDCP Sequence Numbers (SNs) will be maintained throughout the handover procedure. Thus, one common (for source and target) reordering and duplication function is provided in a single PDCP entity. Ciphering/deciphering and header compression/decompression need to be processed separately in a common PDCP entity depending on the source/destination of downlink/uplink data packets.
As an alternative implementation, fig. 5 is a schematic diagram of a DCHO handover procedure according to an embodiment of the present application.
It should be noted that DCHO handover can be performed on both the interface Xn and the N2 interface. Here, the DCHO procedure is described based on HO handover of Xn interface, specifically as follows.
Step 1, a source base station sourcNB (corresponding to a source cell in the above embodiment) issues measurement configuration for a UE (corresponding to a user terminal in the above embodiment); the UE reports a measurement report;
wherein gNB is referred to as the next generation base station, namely base station of 5G network.
Step 2, HO decision, namely, the source base station judges the switching of the UE according to the measurement report and RRM information;
step 3, the source base station sourcing nb sends a handover request (handover request) message to the target base station TargetgNB (corresponding to the target cell in the above embodiment), where the message includes information required for preparing (hand-in) the target cell;
step 4, the target base station prepares for switching (resource) and sends switching request confirm (handover request acknowledgement) message to the source base station; i.e. ACK acknowledgement character, the message of the target base station also indicates whether to accept DCHO handover;
step 5, the source base station sends RRC reconfiguration information to the UE through an air interface (Uu) to trigger switching;
Step 6, for DRBs configured by DCHO, the source base station transmits an extremely early state transmission (EARLYSTATATIUSTRANSFER); entering RACH Procedure;
step 7, after the user terminal is synchronized with the target cell, the RRC reconfiguration completion message is sent to the target base station, and the switching is completed;
step 8, the target base station sends a switching success message to the source base station to inform the UE that the UE has successfully accessed the target cell;
step 9, the source base station transmits the SNSTATUSTNSFER which is DRB according to the extremely early state transmission of DCHO configuration;
step 10, the UE completes the dual connectivity of the DL/UL data on the source base station and the target base station, and finally completes the transmission of the DL/UL data on the target base station;
and step 11, the target base station sends the UEContextRELEASE to the source base station to really complete the DCHO switching process.
As an alternative embodiment, for a better understanding of the solution of the present application, the specific steps thereof will now be described from the downlink and uplink, respectively, according to a specific traffic direction:
the corresponding downlink processing at the user terminal is as follows:
s601, in the switching preparation process, a migration channel is required to be established;
s602, the source base station is responsible for distributing downlink PDCP SNs until the distribution of the SNs is handed to the target base station and data forwarding is performed. That is, the source base station does not stop assigning pdcps to downlink data packets until it receives the handover success message and sends an SN status transmission message to the target base station;
S603, when the source base station allocates downlink PDCP SNs, it starts to schedule downlink data on the source cell radio link and starts to forward the downlink PDCP SDUs to the target base station along with the designated PDCP SNs;
s604. for safe synchronization, also the HFN is maintained, and the source base station provides one reference HFN of UL and one reference HFN of DL, i.e. HFN and corresponding SN, to the target;
s605, the source base station transmits an early state transmission message to transmit a Downlink (DL) count value, which indicates PDCPSN and HFN of a first PDCP SDU forwarded to the target base station by the source base station;
s606, the source base station maintains the HFN and the PDCPSN after giving the SN value to the target base station. Even in RLC-UM mode, the SN status transfer message indicates that the next dl PDCP SN is allocated to a packet that has no PDCP sequence number yet;
s607, during the switching execution period, the source base station and the target base station respectively execute ROHC header compression, encryption and PDCP header addition;
s608, the UE continues to receive downlink data from the source base station and the target base station during the switching execution period; until an explicit release command from the target base station is received in the connection of the source base station;
s609, maintaining the security and the decompression of the ROHC head which are independent relative to each gNB during the execution of the handover, and simultaneously maintaining the functions of general reordering, repeated detection and discarding; the pdcchs are sequentially transmitted to an upper layer. The continuity of RLCAM and UMDRBs using DCHO configuration is supported.
The corresponding uplink processing at the user terminal is as follows:
and S701, the UE transmits uplink data to the source base station until the random access process at the target base station is completed. Then the UE switches the uplink data transmission to the target base station;
s702, even after switching UL data transmission, the UE still continues to send uplink L1 layer CSI and HARQ; the L2 layer RLC feeds back ROHC, and the HARQ data is retransmitted and the RLC data is retransmitted to the source gNB;
s703 during handover execution, the UE maintains separate security context and ROHC header compression context for transmission between the source base station and the target base station uplink. The UE maintains generic ulpdcppsn allocation, supporting the continuity of RLCAM and UMDRB using DCHO configuration;
s704, maintaining respective safety, ROHC header decompression and context processing of UL data received from the UE by the source base station and the target base station during the execution of the handover;
s705, whether a forwarding tunnel is established or not is an option;
s706.hfn and pdcsn are maintained in the target base station. That is, in RLC-UM mode, the first missing UL data in SN state transition is also transferred to 5GC.
S707, once receiving the DCHO switching command message, the UE suspends the SRBs of the source cell, stops sending and receiving any RRC control signaling to the source cell, and establishes the SRBs for the target cell;
S708, after the UE successfully executes DCHO handover, the UE receives a source cell release instruction from the target cell and releases the SRBs configuration of the source cell;
s709. when DCHO fails to handover to the target cell, if the source cell link is available, the UE will return to the source cell configuration and activate source cell SRBs running control (flat) plane signaling.
In summary, by dual connectivity handover DCHO, the UE is made to connect with the source cell during the handover to keep processing of RX and TX of user data until it is able to send and receive user data in the target cell. I.e. during the handover procedure, the connection with the source cell and the target cell is maintained for a short time and data is transmitted and received simultaneously in the source cell and the target cell.
From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising several instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method of the various embodiments of the present application.
Fig. 6 is a block diagram of a handover apparatus of a cell according to an embodiment of the present application; as shown in fig. 6, includes:
a first sending module 62, configured to send a handover request message to a target cell when it is determined that a user terminal is to perform cell handover, where the handover request message is used to instruct the target cell to switch in handover resources required when the user terminal connected to a source cell;
and a second sending module 64, configured to send an RRC reconfiguration message to the ue through an air interface when a request acknowledgement message fed back by the target cell based on the handover request message is received, so as to trigger the ue to handover from the source cell to the target cell using dual connectivity handover, where the request acknowledgement message carries at least information that the target cell supports dual connectivity handover, and the dual connectivity handover is used to instruct that the source cell and the target cell are allowed to connect to the ue simultaneously in a handover process, and support data transceiving for the ue.
Through the above embodiment, after the user terminal connects the source cell and the target cell, the dual-connection switching process is executed, so that the user terminal can ensure the sending and receiving processes of the source cell to the user data corresponding to the user terminal under the condition that the switching is not completed completely in the process of switching from the source cell to the target cell. By adopting the embodiment, the problems of communication interruption and the like in the process of switching the user terminal from the source cell to other target cells in the related technology are solved, the situation that communication interruption does not occur in switching among different cells is ensured, the stability and the reliability of the communication process are greatly improved, and the technical effect of reducing the communication delay is realized.
In an exemplary embodiment, the above apparatus further includes: a third determining module 60 for determining a measurement report of the user terminal connected to the source cell before transmitting a handover request message to the target cell; and determining whether the user terminal needs to perform cell switching according to the measurement report and RRM information corresponding to the source cell and the user terminal.
In an exemplary embodiment, the above apparatus further includes: a fourth determining module 66, configured to send an RRC reconfiguration message to the ue over an air interface to trigger the ue to allocate a sequence code of a PDCP packet for supporting data synchronization to a downlink corresponding to the ue after the ue is handed over from the source cell to the target cell using dual connectivity handover; determining a forwarding result of the user terminal for forwarding the sequence code and the data service unit corresponding to the downlink to the target cell; and under the condition that the target cell receives the RRC reconfiguration completion message sent by the user terminal and the forwarding result indicates that forwarding is successful, determining that switching is completed, and stopping distributing the sequence code to the downlink.
In an exemplary embodiment, the above apparatus further includes: a fifth determining module 68, configured to send an RRC reconfiguration message to the ue over an air interface to trigger the ue to switch from the source cell to the target cell using dual connectivity handover, and send a notification message to the ue that the ue has successfully accessed the target cell if a handover success message sent by the target cell is received; acquiring the synchronous condition of the DL/UL data of the source cell and the target cell corresponding to the user terminal after receiving the notification message; and determining that the current source cell allows the cell release operation to be performed under the condition that the synchronization condition indicates that the synchronization is completed.
In an exemplary embodiment, the above apparatus further includes: a sixth determining module 70, configured to send an RRC reconfiguration message to the ue over an air interface, so as to trigger the ue to use dual connectivity handover to switch from the source cell to the target cell, and then receive an operation command corresponding to the dual connectivity handover sent by the ue; and determining a first connection mode of the source cell and the user terminal and a second connection mode of the source cell and the target device according to the operation command, wherein the first connection mode is used for indicating that the source cell is continuously connected with the user terminal when the source cell does not receive a handover success message sent by the target device, and the second connection mode is used for indicating that the source cell is continuously connected with the user terminal when the target cell does not receive the RRC reconfiguration completion message.
Fig. 7 is a block diagram of a handover apparatus of another cell according to an embodiment of the present application; as shown in fig. 7, includes:
a feedback module 74, configured to, in a case where it is determined that the ue is to perform cell handover, feed back a corresponding request acknowledgement message to the source cell according to a handover request message sent by the source cell, so as to instruct the ue to perform dual-connectivity handover between the source cell and the target cell based on the request acknowledgement message; the request message is used for indicating switching resources required by a target cell when the target cell cuts into a user terminal connected with a source cell, the request confirmation message at least carries information of the target cell supporting dual-connection switching, and the dual-connection switching is used for indicating that the source cell and the target cell are allowed to be simultaneously connected with the user terminal in a switching process and supporting data receiving and transmitting of the user terminal.
Through the above embodiment, after the user terminal connects the source cell and the target cell, the dual-connection switching process is executed, so that the user terminal can ensure the sending and receiving processes of the source cell to the user data corresponding to the user terminal under the condition that the switching is not completed completely in the process of switching from the source cell to the target cell. By adopting the embodiment, the problems of communication interruption and the like in the process of switching the user terminal from the source cell to other target cells in the related technology are solved, the situation that communication interruption does not occur in switching among different cells is ensured, the stability and the reliability of the communication process are greatly improved, and the technical effect of reducing the communication delay is realized.
Optionally, the apparatus further includes: a sending module 76, configured to obtain a handover result of the ue from the source cell to the target cell using dual connectivity handover; and sending a handover success message to the source cell when the handover result indicates that the handover is successful.
An embodiment of the present application also provides a storage medium including a stored program, wherein the program executes the method of any one of the above.
Alternatively, in the present embodiment, the above-described storage medium may be configured to store program code for performing the steps of:
s1, under the condition that a user terminal is determined to be subjected to cell switching, a switching request message is sent to a target cell, wherein the switching request message is used for indicating switching resources required by the target cell when the target cell cuts into the user terminal connected with a source cell;
s2, under the condition that a request confirmation message fed back by the target cell based on the switching request message is received, an RRC reconfiguration message is sent to the user terminal through an air interface so as to trigger the user terminal to switch from the source cell to the target cell by using dual-connection switching, wherein the request confirmation message at least carries information that the target cell supports dual-connection switching, and the dual-connection switching is used for indicating that the source cell and the target cell are allowed to be simultaneously connected with the user terminal in the switching process and supporting data receiving and transmitting of the user terminal.
Alternatively, in the present embodiment, the above-described storage medium may be further configured to store program code for performing the steps of:
s1, under the condition that a user terminal is determined to be subjected to cell switching, feeding back a corresponding request confirmation message to a source cell according to a switching request message sent by the source cell, so as to instruct the user terminal to perform double-connection switching between the source cell and a target cell based on the request confirmation message; the request message is used for indicating switching resources required by a target cell when the target cell cuts into a user terminal connected with a source cell, the request confirmation message at least carries information of the target cell supporting dual-connection switching, and the dual-connection switching is used for indicating that the source cell and the target cell are allowed to be simultaneously connected with the user terminal in a switching process and supporting data receiving and transmitting of the user terminal.
An embodiment of the application also provides an electronic device comprising a memory having stored therein a computer program and a processor arranged to run the computer program to perform the steps of any of the method embodiments described above.
Optionally, the electronic apparatus may further include a transmission device and an input/output device, where the transmission device is connected to the processor, and the input/output device is connected to the processor.
Alternatively, in the present embodiment, the above-described processor may be configured to execute the following steps by a computer program:
s1, under the condition that a user terminal is determined to be subjected to cell switching, a switching request message is sent to a target cell, wherein the switching request message is used for indicating switching resources required by the target cell when the target cell cuts into the user terminal connected with a source cell;
s2, under the condition that a request confirmation message fed back by the target cell based on the switching request message is received, an RRC reconfiguration message is sent to the user terminal through an air interface so as to trigger the user terminal to switch from the source cell to the target cell by using dual-connection switching, wherein the request confirmation message at least carries information that the target cell supports dual-connection switching, and the dual-connection switching is used for indicating that the source cell and the target cell are allowed to be simultaneously connected with the user terminal in the switching process and supporting data receiving and transmitting of the user terminal.
Optionally, in this embodiment, the above processor may be further configured to execute the following steps by a computer program:
s1, under the condition that a user terminal is determined to be subjected to cell switching, feeding back a corresponding request confirmation message to a source cell according to a switching request message sent by the source cell, so as to instruct the user terminal to perform double-connection switching between the source cell and a target cell based on the request confirmation message; the request message is used for indicating switching resources required by a target cell when the target cell cuts into a user terminal connected with a source cell, the request confirmation message at least carries information of the target cell supporting dual-connection switching, and the dual-connection switching is used for indicating that the source cell and the target cell are allowed to be simultaneously connected with the user terminal in a switching process and supporting data receiving and transmitting of the user terminal.
Alternatively, in the present embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-only memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, etc. that can store program codes.
Alternatively, specific examples in this embodiment may refer to examples described in the foregoing embodiments and optional implementations, and this embodiment is not described herein.
It will be appreciated by those skilled in the art that the modules or steps of the application described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may alternatively be implemented in program code executable by computing devices, so that they may be stored in a memory device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps within them may be fabricated into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the principle of the present application should be included in the protection scope of the present application.
Claims (11)
1. A method of cell handover, applied to a source cell, the method comprising:
under the condition that the user terminal is determined to be subjected to cell switching, a switching request message is sent to a target cell, wherein the switching request message is used for indicating switching resources required by the target cell when the target cell cuts into the user terminal connected with a source cell;
and under the condition that a request confirmation message fed back by the target cell based on the switching request message is received, an RRC reconfiguration message is sent to the user terminal through an air interface so as to trigger the user terminal to switch from the source cell to the target cell by using double-connection switching, wherein the request confirmation message at least carries information of supporting double-connection switching by the target cell.
2. The method of claim 1, wherein prior to sending the handover request message to the target cell, the method further comprises:
Determining a measurement report of a user terminal connected to the source cell;
and determining whether the user terminal needs to perform cell switching according to the measurement report and RRM information corresponding to the source cell and the user terminal.
3. The method of claim 1, wherein after sending an RRC reconfiguration message to the user terminal over an air interface to trigger the user terminal to switch from the source cell to the target cell using dual connectivity handover, the method further comprises:
allocating a sequence code of a PDCP data packet for supporting data synchronization to a downlink corresponding to the user terminal;
determining a forwarding result of the user terminal for forwarding the sequence code and the data service unit corresponding to the downlink to the target cell;
and under the condition that the target cell receives the RRC reconfiguration completion message sent by the user terminal and the forwarding result indicates that forwarding is successful, determining that switching is completed, and stopping distributing the sequence code to the downlink.
4. The method of claim 1, wherein after sending an RRC reconfiguration message to the user terminal over an air interface to trigger the user terminal to switch from the source cell to the target cell using dual connectivity handover, the method further comprises:
Under the condition that a handover success message sent by the target cell is received, sending a notification message that the target cell is successfully accessed to the user terminal;
acquiring the synchronous condition of the DL/UL data of the source cell and the target cell corresponding to the user terminal after receiving the notification message;
and determining that the current source cell allows the cell release operation to be performed under the condition that the synchronization condition indicates that the synchronization is completed.
5. The method of claim 1, wherein after sending an RRC reconfiguration message to the user terminal over an air interface to trigger the user terminal to switch from the source cell to the target cell using dual connectivity handover, the method further comprises:
receiving an operation command corresponding to the dual-connection switching sent by the user terminal;
and determining a first connection mode of the source cell and the user terminal and a second connection mode of the source cell and the target device according to the operation command, wherein the first connection mode is used for indicating that the source cell is continuously connected with the user terminal when the source cell does not receive a handover success message sent by the target device, and the second connection mode is used for indicating that the source cell is continuously connected with the user terminal when the target cell does not receive the RRC reconfiguration completion message.
6. A method of cell handover, applied to a target cell, the method comprising:
under the condition that the user terminal is determined to be subjected to cell switching, feeding back a corresponding request confirmation message to a source cell according to a switching request message sent by the source cell, so as to instruct the user terminal to perform double-connection switching between the source cell and the target cell based on the request confirmation message; the switching request message is used for indicating switching resources required by a target cell when switching into a user terminal connected with a source cell, and the request confirmation message at least carries information of the target cell supporting dual-connection switching.
7. The method of claim 6, wherein the method further comprises:
acquiring a switching result of the user terminal from the source cell to the target cell by using dual-connection switching;
and sending a handover success message to the source cell when the handover result indicates that the handover is successful.
8. A handover apparatus for a cell, the apparatus being adapted for use in a source cell, the apparatus comprising:
the first sending module is used for sending a switching request message to a target cell under the condition that the user terminal is determined to be subjected to cell switching, wherein the switching request message is used for indicating switching resources required by the target cell when the target cell cuts into the user terminal connected with a source cell;
And the second sending module is used for sending an RRC reconfiguration message to the user terminal through an air interface under the condition that a request confirmation message fed back by the target cell based on the switching request message is received, so as to trigger the user terminal to switch from the source cell to the target cell by using double-connection switching, wherein the request confirmation message at least carries information of supporting double-connection switching by the target cell.
9. A handover apparatus for a cell, the apparatus being adapted for use in a target cell, the apparatus comprising:
the feedback module is used for feeding back a corresponding request confirmation message to the source cell according to a switching request message sent by the source cell under the condition that the user terminal is determined to be subjected to cell switching, so as to instruct the user terminal to perform double-connection switching between the source cell and the target cell based on the request confirmation message; the switching request message is used for indicating switching resources required by a target cell when switching into a user terminal connected with a source cell, and the request confirmation message at least carries information of the target cell supporting dual-connection switching.
10. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored program, wherein the program when run performs the method of any of the preceding claims 1 to 5 or 6 to 7.
11. An electronic device comprising a memory and a processor, characterized in that the memory has stored therein a computer program, the processor being arranged to execute the method according to any of the claims 1-5 or 6-7 by means of the computer program.
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| CN202311421756.9A CN117221967A (en) | 2023-10-27 | 2023-10-27 | Cell switching method and device, storage medium and electronic device |
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| CN202311421756.9A CN117221967A (en) | 2023-10-27 | 2023-10-27 | Cell switching method and device, storage medium and electronic device |
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