Method and equipment for data transmission in relay network

A relay network, data transmission technology, applied in the field of communication

Active Publication Date: 2021-02-23
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] An object of the embodiments of the present invention is to provide a method and device for data transmission in a relay network to solve the problem of how to ensure lossless data transmission when the network topology changes in a multi-hop relay network

Method used

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  • Method and equipment for data transmission in relay network
  • Method and equipment for data transmission in relay network
  • Method and equipment for data transmission in relay network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] Embodiment 1: Data transmission when IAB node changes the access node, see Figure 5 .

[0100] Step 1: The BAP layer in the IAB node1 caches data packets to be transmitted (or data packets with unconfirmed transmission status), including: data packets not submitted to the RLC layer, submitted to the RLC layer (and / or MAC layer) data packets, data packets that have been transmitted to the upper node on the air interface;

[0101] For example, a data packet to be transmitted is buffered by a redundant buffer (Redundant buffer) and / or a transmission buffer (Transmission buffer).

[0102] Step 2: If the conditions for deleting the BAP cache are met, delete the data packets in the BAP cache, for example, delete data packet #2, data packet #3 and data packet #4;

[0103] It can be understood that, for the specific process of deleting the data packets in the BAP cache, reference may be made to Embodiments 2-6.

[0104] Step 3: If the IAB node is connected to another upper-le...

Embodiment 2

[0107] Embodiment 2: RLC feeds back successfully transmitted data packets to BAP according to PDCP SN, see Figure 6 .

[0108] Step 1: The BAP layer analyzes the identification mark carried by the data packet, such as the PDCP SN, and the BAP layer submits the data packet to the RLC layer. Optionally, the identification mark also includes: a terminal identification and / or a bearer identification;

[0109] Step 2: The RLC layer receives the data packet submitted by the BAP layer, organizes it into an RLC PDU for air interface transmission, and parses the identification mark carried by the data packet, such as the PDCP SN. Optionally, the identification mark also includes a terminal identification and / or Bearer ID;

[0110] Step 3: The RLC layer receives the RLC feedback sent by the opposite end, and for the data packet that receives the RLC ACK, feeds back to the BAP the identifier of the data packet that the BAP layer can recognize, specifically the feedback PDCP SN, and opt...

Embodiment 3

[0113] Embodiment 3: RLC feeds back successfully transmitted data packets to BAP according to BAP SN, see Figure 6 .

[0114] Step 1: The BAP layer submits the data packet to the RLC layer, and assigns the BAP SN to the data packet;

[0115] Step 2: The RLC layer receives the data packet submitted by the BAP layer and the BAP SN corresponding to the data packet. The RLC layer can strip the BAP SN and not include it in the RLC PDU, or the BAP SN can also be included in the RLC PDU middle;

[0116] Step 3: The RLC layer receives the RLC feedback sent by the opposite end, and feeds back to the BAP the BAP SN of the data packet that successfully received the RLC ACK;

[0117] For example, an indication of successful reception of data packet #2 and data packet #3 is fed back, or an indication of successful reception of data packet #4 and data packet #5 is fed back.

[0118] Step 4: The BAP layer deletes the successfully sent data packets in the BAP cache according to the feedba...

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Abstract

The embodiment of the invention provides a method and equipment for data transmission in a relay network. The method comprises the following steps: caching a data packet of which the transmission condition is not confirmed through a BAP layer in an IAB node; and if a superior node accessed by the IAB node is changed, transmitting the data packet of which the transmission condition is not confirmedto a new superior node. In the embodiment of the invention, the BAP layer in the IAB node caches the data packet of which the transmission condition is not confirmed, and after the superior node accessed by the IAB node is changed, the data packet cached by the BAP layer can be submitted to a lower layer again and transmitted to the new superior node, so that data lossless transmission during network topology architecture change in the multi-hop network can be realized.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of communications, and in particular to a method and device for data transmission in a relay network. Background technique [0002] In a relay network, when a certain Integrated Access and Backhaul (IAB) node (node) initiates wireless link creation to other IAB nodes, the existing technical solution is Radio Link Control (RLC) ) layer reconstruction, the data in the RLC layer transmission buffer and the data that has not been successfully transmitted are all discarded. Therefore, in a multi-hop relay network, when the network topology changes, how to ensure lossless data transmission is an urgent problem to be solved. Contents of the invention [0003] An object of the embodiments of the present invention is to provide a method and device for data transmission in a relay network, so as to solve the problem of how to ensure lossless data transmission when the network topology chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04W28/02H04L1/00
CPCH04L1/1607H04W28/0278H04L1/0015H04L1/16H04W28/02H04L1/00H04W24/10H04W36/00
Inventor 谌丽
Owner DATANG MOBILE COMM EQUIP CO LTD
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