CN112787759B - Method for optimizing cross-base station switching efficiency - Google Patents
Method for optimizing cross-base station switching efficiency Download PDFInfo
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- CN112787759B CN112787759B CN202110101698.6A CN202110101698A CN112787759B CN 112787759 B CN112787759 B CN 112787759B CN 202110101698 A CN202110101698 A CN 202110101698A CN 112787759 B CN112787759 B CN 112787759B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
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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
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
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Abstract
The invention relates to a method for optimizing cross-base station switching efficiency, which comprises the following steps: after a source base station and a target base station are powered on and enter a working state, starting a redundant information transmission function of a reverse transmission tunnel and configuring relevant parameters aiming at URLLC (universal resource link control) service; after the source base station receives a switching instruction sent by user equipment, the source base station and the target base station enter a switching process, negotiate whether to start redundant information transmission according to the service characteristics of the user equipment, and negotiate the redundant information coding parameters and decoding parameters; when data is transmitted backwards after successful negotiation, the source base station performs redundant coding on the data transmitted backwards according to the negotiated coding parameters, and the target base station decodes the received data according to the negotiated decoding parameters; and the target base station forwards the reverse transmission data to the user equipment. The invention minimizes the influence of the loss of the reverse transmission data in the transmission link on the URLLC service in the switching process.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method for optimizing cross-base station switching efficiency.
Background
In an existing 5G (5Generation, 5 th Generation) communication system, when a UE (User Equipment) is switched across a gbb (terminology, 5G base station), in order to reduce packet loss during the switching process as much as possible, downlink data received on a source gbb needs to be retransmitted (data forwarding) to a target gbb, in the retransmission process, corresponding data is transmitted through a GTPU (general packet radio service tunnel protocol)/UDP (User data protocol), and if the transmission link loses packet, the wireless protocol does not perform special processing on the packet loss, for example, retransmission, and needs to sense packet loss by an upper application and retransmit the packet loss.
In the above process, once the transmission link loses packets, the upper layer is required to sense and retransmit the packets, which has little influence on the common MBB (Mobile Broadband service), but may cause a serious problem for URLLC (Ultra-reliable and Low Latency Communication) service.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for optimizing cross-base station switching efficiency, and minimize the influence of the loss of reverse transmission data in a transmission link on URLLC service in the switching process.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for optimizing cross-base station handover efficiency is provided, which comprises the following steps:
(1) after a source base station and a target base station are powered on and enter a working state, starting a redundant information transmission function of a reverse transmission tunnel and configuring relevant parameters aiming at URLLC (universal resource link control) service;
(2) after a source base station initiates switching based on the air interface characteristic decision of user equipment, the source base station and a target base station enter a switching process, negotiate whether to start redundant information transmission according to the service characteristic of the user equipment, and negotiate the redundant information coding parameter and decoding parameter;
(3) when data is transmitted backwards after successful negotiation, the source base station performs redundant coding on the data transmitted backwards according to the negotiated coding parameters, and the target base station decodes the received data according to the negotiated decoding parameters;
(4) and the target base station forwards the reverse transmission data to the user equipment.
And (3) the source base station negotiates with the target base station in the step (2) by means of switching the additional cell in the message in the signaling interaction process.
And (3) the mode of transmitting the redundant information in the step (2) is message replication or encoding based on a fountain code mode.
In the step (2), the source base station and the destination base station need to have the same capability to complete successful negotiation to enable the redundant transmission.
When the source base station sends data in the step (3), copying two copies of the same message and sending the message; when the target base station receives the data, whether the received message is a repeated message needs to be judged, and the target base station needs to perform protocol processing on the initially transmitted message and discard the repeated message.
When the source base station sends data in the step (3), encoding the data by adopting a fountain code based mode; and the target base station adopts fountain codes to decode when receiving data.
Advantageous effects
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects: by using the redundant data, a small amount of packet loss can be recovered based on the redundant data in the transmission link, so that the time delay and the reliability of the wireless transmission link are not influenced by the small amount of packet loss.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The embodiment of the invention relates to a method for optimizing cross-base station switching efficiency, which comprises the following steps as shown in figure 1:
1) after the source base station and the target base station are powered on and enter a working state, operation and maintenance personnel configure the switching starting redundancy transfer aiming at a certain service.
In this embodiment, the service characteristics may be described by using a Quality of service (QoS) attribute, for example, service enablement for a 5QI (5G QoS Identity, 5G QoS identifier) attribute of 82; or using Slice attribute to describe, for example, Service enablement for SST (Slice/Service type) 2 in NSSAI (Network Slice Selection Assistance Information).
The redundant transmission mode in this embodiment may be to simply copy two packets for transmission, or to encode data that needs to be retransmitted based on fountain codes or a coding mode that can achieve similar effects.
2) When a User Equipment (UE) creates a service at a source base station, it needs to explicitly declare that the service is a URLLC service, specifically:
a) when the UE creates a PDU (Protocol Data Unit) session with a CN (core network), the UE determines a slice type of the session through a corresponding signaling flow, and the specific flow may refer to 3GPP 38.413 and the like.
b) In the service process of the UE and the CN, a 5qi attribute is specified for a new service flow, and the specific flow refers to protocols such as 3GPP 23.501.
3) The source base station obtains better service based on the air interface characteristics of the user equipment (the source base station considers that the UE cannot obtain better service at the source base station, and the UE is switched to the target base station to obtain better service, for example, the UE is at the edge of a cell at the source base station, the signal quality is poor, but the signal quality of the target base station at the position of the UE is good; or the handover may improve the service quality of the whole system, for example, the source base station is busy and the destination base station is idle) to decide to initiate handover;
when UE moves from a source base station to a target base station, the source base station reports a measurement report, and the source base station performs a switching process based on the measurement report; or the UE does not actively report the measurement report, and the source base station determines that the UE needs to be forcibly handed over to the destination base station, for example, the source base station may be based on that the load of the source station is too high and the load of the destination station is low, which is referred to in the process of 3GPP 38.133, 38.331, and the like. The source base station determines whether to initiate handover depends on a specific implementation, and there are many possible situations, which are not enumerated here.
4) A source base station and a target base station need to negotiate whether to start transmitting redundant information and negotiate parameters of encoding and decoding the redundant information in the switching signaling interaction process;
in this step, the specific handover signaling interaction process refers to protocols 38.413, 38.423, etc., and the description is not repeated here. The redundant information negotiation may be an additional information element within the message in the handover signaling interaction procedure, for example: for an Xn (terminology, specifically referring To the interface between gnbs) HANDOVER scenario, the source base station may add a cell below a PDU Session Resources To Be Setup List cell in the HANDOVER REQUEST message, where the cell content includes whether the redundant data transfer mode is enabled, and possibly parameters.
The redundant data transfer mode may Be a simple message duplication, in which case no additional parameters are needed, and therefore, the cells added below the PDU Session Resources To Be Setup Item cell only need To include a variable indicating the redundant data transfer mode.
The redundant data transmission mode may also Be based on a fountain code, in this case, the cells added below the PDU Session Resources To Be Setup Item cell also need To include algorithm parameters of the fountain code, and the specific algorithm parameters depend on the specific implementation and are not limited herein.
The redundant data delivery mode may also be other encoding schemes that achieve similar effects.
It should be noted that the redundant transmission can be enabled only when the source base station and the destination base station need to have the same capability and complete the successful negotiation, and if any party does not support the related algorithm, the negotiation fails, and the logic of the related data back-transmission is performed according to the 3GPP standard.
And the source base station initiates capability negotiation, and if the confirmation information of the opposite side is not obtained, the negotiation is considered to be failed. The confirmation information of the opposite side is represented by information such as whether the redundant data transmission mode is started or not and possible parameters and the like which can be identified by the active base station in the response message sent back by the target base station. For example, in an Xn HANDOVER scenario, in a cell of a PDU Session Resources assigned List below a PDU Session Resources assigned Item in a HANDOVER REQUEST ACKNOWLEDGE message responded by a destination base station, a PDU Session Resources assigned Info information cell includes a cell whether to enable a redundant data transfer mode.
If the source base station initiates the negotiation but the destination base station itself does not support the logic, the corresponding cell will not be included in the response message, and the negotiation is considered to fail.
Or, the destination base station itself supports the processing, but if the destination base station is overloaded and does not wish to enable the processing, the response message may not include the corresponding cell, or the indication does not support, and the negotiation is considered to be failed.
5) And when actual data is retransmitted after the negotiation is successful, the source base station performs redundant coding on the retransmitted data according to the negotiated parameters, and the target base station decodes the received data according to the negotiated parameters.
For simple message replication, a source base station replicates two copies of the same message to send when sending data, a target base station needs to judge whether the received message is a repeated message or not when receiving the data, and the target base station needs to perform protocol processing on an initial message and discard the repeated message. It should be noted that, in order to help the destination base station recognize whether the received message is a duplicate message, the source base station and the destination base station need to perform necessary negotiation, for example, if the destination base station receives two messages with the same IP (Internet Protocol) identifier or GTPU sequence number or other identifier, it can be determined that the second message is a duplicate message, and how to negotiate and determine duplication based on what identifier and what rule are not restrictive here.
For fountain codes or other similar mechanisms, specific behavior refers to correlation algorithms.
6) And the target base station forwards the reverse transmission data to the UE.
As can be seen from the foregoing embodiments, in step 5), occasionally one data packet is lost during transmission, and the destination base station can recover based on the redundant information, and in practical effect, there is no packet loss similar to the transmission process. Therefore, by using the redundant data, a small amount of packet loss can be recovered based on the redundant data in the transmission link, so that the time delay and the reliability of the wireless transmission link are not influenced by the small amount of packet loss.
It should be clear that the source base station and the destination base station are not limited to the 5G standard, and the interface mode between the source base station and the destination base station is not limited to Xn, and may be an N3 or even an X2 interface. The similar technology of this patent is used in all similar scenes and is in the protection scope of this patent. For example, in a case where a CU (central Unit)/DU (Distributed Unit) is separated, there is a scenario where an F1 (proper term, refers to an interface between CUs/DUs) interface packet is lost, and this scenario is similar to a handover scenario from a protocol perspective, but the same applicability exists to the technology related to this patent.
Claims (6)
1. A method for optimizing cross-base station handover efficiency, comprising the steps of:
(1) after a source base station and a target base station are powered on and enter a working state, starting a redundant information transmission function of a reverse transmission tunnel and configuring relevant parameters aiming at URLLC (universal resource link control) service;
(2) after a source base station initiates switching based on the air interface characteristic decision of user equipment, the source base station and a target base station enter a switching process, negotiate whether a condition for starting redundant information transmission is met or not according to the service characteristic of the user equipment, and negotiate the redundant information coding parameter and the decoding parameter;
(3) when data is transmitted backwards after successful negotiation, the source base station performs redundant coding on the data transmitted backwards according to the negotiated coding parameters, and the target base station decodes the received data according to the negotiated decoding parameters;
(4) and the target base station forwards the reverse transmission data to the user equipment.
2. The method of claim 1, wherein in step (2), the source base station negotiates with the destination base station by means of an additional information element in a message in a handover signaling interaction procedure.
3. The method of claim 1, wherein the mode of redundant information transfer in step (2) is packet replication or fountain code based coding.
4. The method of claim 1, wherein in step (2), the source base station and the destination base station need to have the same capability to complete successful negotiation to enable the redundant transmission.
5. The method of claim 1, wherein in the step (3), when the source base station sends data, the source base station copies two packets of the same packet and sends the two packets of the same packet; when the target base station receives the data, whether the received message is a repeated message needs to be judged, and the target base station needs to perform protocol processing on the initially transmitted message and discard the repeated message.
6. The method of claim 1, wherein the source base station encodes data in a fountain code based manner when transmitting the data in step (3); and the target base station adopts fountain codes to decode when receiving data.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026279A (en) * | 2009-09-23 | 2011-04-20 | 中兴通讯股份有限公司 | Method and system for data retransmission |
| CN102238657A (en) * | 2010-04-28 | 2011-11-09 | 中兴通讯股份有限公司 | Switch processing method, device and system |
| CN102917409A (en) * | 2011-08-02 | 2013-02-06 | 中兴通讯股份有限公司 | Switching method, base station and system |
| CN111935745A (en) * | 2020-08-12 | 2020-11-13 | 上海共进信息技术有限公司 | Method for optimizing moving performance of terminal across base stations |
Family Cites Families (1)
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| US11122477B2 (en) * | 2018-02-26 | 2021-09-14 | Qualcomm Incorporated | User plane function (UPF) duplication based make before break handover |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102026279A (en) * | 2009-09-23 | 2011-04-20 | 中兴通讯股份有限公司 | Method and system for data retransmission |
| CN102238657A (en) * | 2010-04-28 | 2011-11-09 | 中兴通讯股份有限公司 | Switch processing method, device and system |
| CN102917409A (en) * | 2011-08-02 | 2013-02-06 | 中兴通讯股份有限公司 | Switching method, base station and system |
| CN111935745A (en) * | 2020-08-12 | 2020-11-13 | 上海共进信息技术有限公司 | Method for optimizing moving performance of terminal across base stations |
Non-Patent Citations (1)
| Title |
|---|
| Discussion on duplication during handover procedure;Huawei等;《3GPP TSG-RAN WG2 #106 R2-1907434》;20190517;全文 * |
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