CN112888032B - Lossless switching method, target base station and lossless switching system - Google Patents
Lossless switching method, target base station and lossless switching system Download PDFInfo
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- CN112888032B CN112888032B CN201911201217.8A CN201911201217A CN112888032B CN 112888032 B CN112888032 B CN 112888032B CN 201911201217 A CN201911201217 A CN 201911201217A CN 112888032 B CN112888032 B CN 112888032B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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Abstract
The present disclosure provides a lossless handover method, a target base station and a lossless handover system, which relate to the technical field of wireless communication, and the method includes: after the terminal is switched to the target base station, the target base station sends a signaling message to the terminal so that the terminal can release the connection with the source base station; after the signaling message is sent, the target base station sends a Packet Data Convergence Protocol (PDCP) sequence number request to the source base station so that the source base station can return a PDCP sequence number message distributed by the source base station; the target base station determines the next PDCP sequence number of the last PDCP sequence number distributed by the source base station according to the PDCP sequence number message; the target base station takes the next PDCP serial number as an initial serial number and numbers the data packet received from the core network; and the target base station sends the numbered data packet to the terminal.
Description
Technical Field
The present disclosure relates to the field of wireless communication technologies, and in particular, to a lossless handover method, a target base station, and a lossless handover system.
Background
At present, mobility of an LTE (Long Term Evolution) system and a 5G NR (New Radio, new air interface) system needs to be further enhanced to realize a handover interruption delay close to 0 ms.
One solution to achieve a handover interruption delay close to 0ms is simultaneous connection handover. During the simultaneous connection handover, the terminal and the source base station still maintain the data connection.
Disclosure of Invention
The inventors have noticed that the PDCP sequence number may not be consecutive during the simultaneous connection handover, and thus a lossless handover cannot be achieved.
In order to solve the above problem, the embodiments of the present disclosure propose the following solutions.
According to an aspect of the embodiments of the present disclosure, there is provided a lossless handover method, including: after a terminal is switched to a target base station, the target base station sends a signaling message to the terminal so that the terminal can release the connection with a source base station; after the signaling message is sent, the target base station sends a Packet Data Convergence Protocol (PDCP) sequence number request to the source base station so that the source base station can return a PDCP sequence number message distributed by the source base station; the target base station determines the next PDCP sequence number of the last PDCP sequence number distributed by the source base station according to the PDCP sequence number message; the target base station takes the next PDCP serial number as an initial serial number and numbers the data packet received from the core network; and the target base station sends the numbered data packet to the terminal.
In some embodiments, the PDCP sequence number message carries a PDCP sequence number carried by a data packet that failed to be sent by the source base station; the lossless handover method further includes: the target base station retransmits the data packet which is failed to be transmitted by the source base station to the terminal; and after receiving a confirmation message returned by the terminal, the target base station numbers the data packet received from the core network, wherein the confirmation message indicates that the terminal receives the data packet retransmitted by the target base station.
In some embodiments, the PDCP sequence number message carries the next PDCP sequence number.
According to another aspect of the embodiments of the present disclosure, there is provided a target base station, including: the first sending module is configured to send a signaling message to the terminal after the terminal is switched to a target base station so that the terminal can release the connection with a source base station; a second sending module, configured to send a packet data convergence protocol PDCP sequence number request to the source base station after sending the signaling message, so that the source base station returns a PDCP sequence number message allocated by the source base station; a determining module configured to determine a next PDCP sequence number of a last PDCP sequence number allocated by the source base station according to the PDCP sequence number message; a numbering module configured to number the data packet received from the core network with the next PDCP sequence number as a starting sequence number; and the third sending module is configured to send the numbered data packets to the terminal.
In some embodiments, the PDCP sequence number message carries a PDCP sequence number carried by a data packet that failed to be sent by the source base station; the third sending module is further configured to resend the data packet which is failed to be sent by the source base station to the terminal; the numbering module is configured to number the data packet received from the core network after receiving a confirmation message returned by the terminal, where the confirmation message indicates that the terminal receives the data packet retransmitted by the target base station.
In some embodiments, the PDCP sequence number message carries the next PDCP sequence number.
According to still another aspect of the embodiments of the present disclosure, there is provided a target base station, including: a memory; and a processor coupled to the memory, the processor configured to perform the method of any of the above embodiments based on instructions stored in the memory.
According to still another aspect of the embodiments of the present disclosure, there is provided a lossless handover system including the target base station of any one of the embodiments.
In some embodiments, the lossless handover system further comprises: the source base station is configured to respond to the PDCP sequence number request sent by the target base station and return the PDCP sequence number message to the target base station; the terminal is configured to respond to the signaling message sent by the target base station and release the connection with the source base station; and receiving the numbered data packet sent by the target base station.
According to a further aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium, on which computer program instructions are stored, wherein the instructions, when executed by a processor, implement the method according to any one of the embodiments described above.
In the embodiment of the disclosure, the target base station sends the PDCP sequence number request to the source base station after sending the signaling message to the terminal, so as to obtain the next PDCP sequence number of the last PDCP sequence number allocated by the source base station. The target base station numbers the data packet by taking the next PDCP sequence number as the starting sequence number, thereby ensuring the continuity of the PDCP sequence number, preventing the loss of the data packet and realizing lossless switching.
The technical solution of the present disclosure is further described in detail by the accompanying drawings and examples.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flow diagram of a lossless handover method according to some embodiments of the present disclosure;
fig. 2 is a block diagram of a target base station in accordance with some embodiments of the present disclosure;
fig. 3 is a block diagram of a target base station in accordance with further embodiments of the present disclosure;
fig. 4 is a block diagram of a lossless handover system, according to some embodiments of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a flow diagram of a lossless handover method according to some embodiments of the present disclosure.
In step 102, after the terminal is handed over to the target base station, the target base station sends a signaling message to the terminal so that the terminal releases the connection with the source base station.
It should be understood that the terminal remains connected to the source base station until the terminal is handed over to the target base station. In this case, the source base station numbers the Data Packet received from the core network, for example, adds a Packet Data Convergence Protocol (PDCP) sequence number assigned by the source base station to the Data Packet, and transmits the resulting Data Packet to the terminal.
In step 104, after sending the signaling message, the target base station sends a PDCP sequence number request to the source base station, so that the source base station returns a PDCP sequence number message allocated by the source base station.
In step 106, the target base station determines a PDCP sequence number next to the last PDCP sequence number allocated by the source base station according to the PDCP sequence number message.
In some embodiments, the PDCP sequence number message may carry the next PDCP sequence number to the last PDCP sequence number assigned by the source base station. In this case, the target base station can directly obtain the next PDCP sequence number according to the PDCP sequence number message.
In other embodiments, the PDCP sequence number message may carry the last PDCP sequence number assigned by the source base station. In this case, the target base station may determine the next PDCP sequence number according to the last PDCP sequence number allocated by the source base station.
In step 108, the target base station numbers the data packet received from the core network with the next PDCP sequence number as the starting sequence number.
For example, the target base station determines that the next PDCP sequence number to the last PDCP sequence number allocated by the source base station is 6. With the sequence number 6 as the starting sequence number, the target base station numbers the data packets received from the core network as 6, 7, 8, 9, 10 … in sequence, thereby forming consecutive PDCP sequence numbers. It should be noted that the specific numbers herein are merely exemplary and are not intended as limitations on the present disclosure.
In step 110, the target base station sends the numbered data packet to the terminal. For example, the target base station sends data packets carrying consecutive PDCP sequence numbers to the terminal.
In the above embodiment, the target base station sends the PDCP sequence number request to the source base station after sending the signaling message to the terminal, so as to obtain the next PDCP sequence number of the last PDCP sequence number allocated by the source base station. The target base station numbers the data packet by taking the next PDCP sequence number as the starting sequence number, thereby ensuring the continuity of the PDCP sequence number, preventing the loss of the data packet and realizing lossless switching.
In some cases, the source base station does not receive the acknowledgement message fed back by the terminal after sending the data packet to the terminal. However, at this time, the connection between the source base station and the terminal has been disconnected. In order to ensure the implementation of lossless handover, the embodiments of the present disclosure further propose the following solution.
In some embodiments, the PDCP sequence number message may further carry a PDCP sequence number carried by a data packet that failed to be sent by the source base station. In this case, after obtaining the PDCP sequence number message, the target base station may retransmit the failed packet to the source base station. And then, after receiving the confirmation message returned by the terminal, the target base station numbers the data packet received from the core network. Here, the acknowledgement message indicates that the terminal receives the data packet retransmitted by the target base station.
For example, according to the PDCP sequence number message, the target base station determines that the next PDCP sequence number to the last PDCP sequence number allocated by the source base station is 7, and the PDCP sequence number message carries the PDCP sequence numbers 2, 3, and 4 carried by the data packet that the source base station failed to send. The target base station can obtain the data packets with the PDCP sequence numbers 2, 3 and 4 from the source base station and resend the three data packets to the terminal. And after receiving the data packet retransmitted by the target base station, the terminal feeds back the confirmation message to the target base station. And after receiving the confirmation message, the target base station numbers the data packet received from the core network from 7 and sends the data packet to the terminal. Therefore, the PDCP serial number of the data packet sent to the terminal by the target base station is continuous with the PDCP serial number of the data packet sent to the terminal by the source base station, and lossless switching is realized.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts in the embodiments are referred to each other. For the target base station embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and for relevant points, reference may be made to the partial description of the method embodiment.
Fig. 2 is a block diagram of a target base station in accordance with some embodiments of the present disclosure.
As shown in fig. 2, the target base station 200 includes a first sending module 201, a second sending module 202, a determining module 203, a numbering module 204, and a third sending module 205.
The first sending module 201 is configured to send a signaling message to the terminal after the terminal is handed over to the target base station 200 so that the terminal releases the connection with the source base station.
The second sending module 202 is configured to send a PDCP sequence number request to the source base station after sending the signaling message, so that the source base station returns a PDCP sequence number message allocated by the source base station.
The determining module 203 is configured to determine a PDCP sequence number next to the last PDCP sequence number assigned by the source base station according to the PDCP sequence number message. In some implementations, the PDCP sequence number message may carry a next PDCP sequence number to a last PDCP sequence number assigned by the source base station. In other implementations, the PDCP sequence number message may carry the last PDCP sequence number assigned by the source base station.
The numbering module 204 is configured to number the data packets received from the core network with the next PDCP sequence number as the starting sequence number. The third sending module 205 is configured to send the numbered data packet to the terminal.
In the above embodiment, the target base station sends the PDCP sequence number request to the source base station after sending the signaling message to the terminal, so as to obtain the next PDCP sequence number of the last PDCP sequence number allocated by the source base station. The target base station numbers the data packet by taking the next PDCP sequence number as the starting sequence number, thereby ensuring the continuity of the PDCP sequence number, preventing the loss of the data packet and realizing lossless switching.
In some embodiments, the PDCP sequence number message carries a PDCP sequence number carried by a data packet that failed to be sent by the source base station. In this case, the third sending module 205 is further configured to resend the source base station sending the failed data packet to the terminal. Accordingly, the numbering module 204 is configured to number the data packets received from the core network after receiving the acknowledgement message returned by the terminal. Here, the acknowledgement message indicates that the terminal receives the data packet retransmitted by the target base station 200.
Fig. 3 is a block diagram of a target base station in accordance with further embodiments of the present disclosure.
As shown in fig. 3, the target base station 300 of this embodiment includes a memory 301 and a processor 302 coupled to the memory 301, and the processor 302 is configured to execute the lossless handover method of any one of the foregoing embodiments based on instructions stored in the memory 301.
The memory 301 may include, for example, system memory, fixed non-volatile storage media, and the like. The system memory may store, for example, an operating system, application programs, a Boot Loader (Boot Loader), and other programs.
The target base station 300 may further comprise an input output interface 303, a network interface 304, a storage interface 305, etc. The interfaces 303, 304, 305 and the memory 301 and the processor 302 may be connected by a bus 306, for example. The input/output interface 303 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 304 provides a connection interface for various networking devices. The storage interface 305 provides a connection interface for external storage devices such as an SD card and a usb disk.
Fig. 4 is a block diagram of a lossless handover system according to some embodiments of the present disclosure.
As shown in fig. 4, the lossless handover system 400 may include the target base station 200/300 of any of the embodiments described above.
In some embodiments, the lossless handover system 400 further includes a source base station 401 and a terminal 402, as shown in fig. 4. The source base station 401 is configured to return a PDCP sequence number message to the target base station 200/300 in response to the PDCP sequence number request transmitted by the target base station 200/300. The terminal 402 is configured to release the connection with the source base station 302 in response to the signaling message sent by the target base station 200/300 and to receive the numbered data packets sent by the target base station 200/300.
In the above embodiment, the PDCP sequence numbers carried by the data packets sent by the target base station to the terminal and the PDCP sequence numbers carried by the data packets allocated by the source base station are kept continuous, thereby implementing lossless handover.
The lossless handover scheme of the embodiment of the present disclosure can enhance the mobility and reliability of a network system when used in an LTE network system or a 5G NR network system.
The embodiments of the present disclosure also provide a computer-readable storage medium, on which computer program instructions are stored, and when the instructions are executed by a processor, the method for processing a service according to any one of the embodiments is implemented.
Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that the functions specified in one or more of the flows in the flowcharts and/or one or more of the blocks in the block diagrams can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (8)
1. A lossless handover method, comprising:
after a terminal is switched to a target base station, the target base station sends a signaling message to the terminal so that the terminal can release the connection with a source base station;
after the signaling message is sent, the target base station sends a Packet Data Convergence Protocol (PDCP) sequence number request to the source base station so that the source base station can return a PDCP sequence number message distributed by the source base station;
the target base station determines the next PDCP sequence number of the last PDCP sequence number distributed by the source base station according to the PDCP sequence number message;
the target base station takes the next PDCP sequence number as an initial sequence number and numbers the data packet received from the core network;
the target base station sends the numbered data packets to the terminal;
wherein the PDCP sequence number message carries the next PDCP sequence number.
2. The method according to claim 1, wherein the PDCP sequence number message carries PDCP sequence numbers carried by data packets which failed to be sent by the source base station;
the method further comprises the following steps:
the target base station retransmits the data packet which is failed to be transmitted by the source base station to the terminal;
and after receiving the confirmation message returned by the terminal, the target base station numbers the data packet received from the core network, wherein the confirmation message indicates that the terminal receives the data packet retransmitted by the target base station.
3. A target base station, comprising:
the first sending module is configured to send a signaling message to the terminal after the terminal is switched to a target base station so that the terminal can release the connection with a source base station;
a second sending module, configured to send a packet data convergence protocol PDCP sequence number request to the source base station after sending the signaling message, so that the source base station returns a PDCP sequence number message allocated by the source base station;
a determining module configured to determine a next PDCP sequence number of a last PDCP sequence number allocated by the source base station according to the PDCP sequence number message, where the PDCP sequence number message carries the next PDCP sequence number;
a numbering module configured to number the data packet received from the core network with the next PDCP sequence number as a starting sequence number;
and the third sending module is configured to send the numbered data packets to the terminal.
4. The target base station according to claim 3, wherein the PDCP sequence number message carries PDCP sequence numbers carried by data packets that failed to be sent by the source base station;
the third sending module is further configured to resend the data packet which is failed to be sent by the source base station to the terminal;
the numbering module is configured to number the data packet received from the core network after receiving a confirmation message returned by the terminal, where the confirmation message indicates that the terminal receives the data packet retransmitted by the target base station.
5. A target base station, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the method of claim 1 or 2 based on instructions stored in the memory.
6. A lossless handover system comprising:
the target base station of any of claims 3-5; and
the source base station is configured to respond to the PDCP sequence number request sent by the target base station and return the PDCP sequence number message to the target base station.
7. The system of claim 6, further comprising:
the terminal is configured to respond to the signaling message sent by the target base station and release the connection with the source base station; and receiving the numbered data packet sent by the target base station.
8. A computer readable storage medium having computer program instructions stored thereon, wherein the instructions, when executed by a processor, implement the method of claim 1 or 2.
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| CN201911201217.8A CN112888032B (en) | 2019-11-29 | 2019-11-29 | Lossless switching method, target base station and lossless switching system |
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| US8265628B2 (en) * | 2007-04-25 | 2012-09-11 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for seamless handover in a wireless communication network |
| US10687263B2 (en) * | 2018-02-15 | 2020-06-16 | Qualcomm Incorporated | Enhanced make-before-break handover |
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| CN101690319A (en) * | 2007-04-27 | 2010-03-31 | 诺基亚西门子通信公司 | Method, radio system, and base station |
| CN103313325A (en) * | 2012-03-09 | 2013-09-18 | 中兴通讯股份有限公司 | Switching method and device and data processing method and device |
| CN109151918A (en) * | 2017-06-13 | 2019-01-04 | 华为技术有限公司 | Method for handover control and device |
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