Transmission method for broadcast/multicast feedback signaling

A transmission method and signaling technology, applied in the field of communication information, can solve the problems of consuming large spectrum resources, error feedback, and high feedback overhead

Inactive Publication Date: 2013-07-24
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] To sum up, the existing wireless communication technologies either do not support the feedback of broadcast signal reception errors, and cannot use feedback to improve the reliability of broadcast communication, or although they support multicast / broadcast communication feedback, the feedback The overhead is very large, and with the increase of the number of feedback nodes, a large amount of spectrum resources need to be consumed, so its application is limited

Method used

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  • Transmission method for broadcast/multicast feedback signaling
  • Transmission method for broadcast/multicast feedback signaling
  • Transmission method for broadcast/multicast feedback signaling

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0052] The present invention proposes a set of feedback signaling sending schemes aiming at whether layer 2 data packet transmission is successful or not in a broadcast / multicast system. The purpose of the feedback scheme is to enable the wireless communication system to support reliable and efficient broadcast / multicast communication.

[0053] The technical solution proposed by the present invention includes two parts: an uplink resource allocation process of broadcast / multicast feedback, and a process of generating and sending broadcast / multicast feedback signals.

[0054] 1. Uplink resource allocation process of broadcast / multicast feedback

[0055] In uplink resource allocation, the same time-frequency resource is allocated to all nodes (hereinafter referred to as child nodes) that may feed back to the same node (hereinafter referred to as parent node) that sends broadcast / multicast signals to support the feedback signal. command transmission.

[0056] In the uplink reso...

Embodiment 2

[0082] Embodiment 2: A system in which sub-nodes can predict transmission channels

[0083] In certain fixed wireless access systems of TDD mode, because the channel time becomes slow (for example, the moving speed of 2.4GHz is 3km / h corresponding to the Doppler frequency of about 7Hz), so when the frame length is short (such as IEEE802.16d standard The frame length defined in includes 2.5ms, 4ms, 5ms and other options), and the channel in the uplink subframe may have reciprocity with the channel in the downlink subframe. Although the receiving end of the upstream channel and the receiving end of the downstream channel may face different interferences, the present invention is mainly concerned with the channel experienced by the transmitted (NAK) useful signal itself.

[0084] When the system sends a broadcast / multicast signal, a flow identifier can be assigned to the data flow in the downlink resource allocation signaling, indicating which users the flow is sent to, and indic...

Embodiment 3

[0095] Embodiment Three: General System

[0096] In systems such as FDD, since the uplink and downlink channels are independent of each other, it is difficult for sub-nodes to predict their transmission channels. In this case, the first method based on pre-equalization cannot be used, and only the second method applicable to general systems can be used.

[0097] When the system sends a broadcast / multicast signal, a flow identifier can be assigned to the data flow in the downlink resource allocation signaling, indicating which users the flow is sent to, and indicating whether the flow supports feedback; while in the uplink resource allocation signaling In this frame, the corresponding uplink feedback resource can be allocated for the downlink broadcast / multicast data sent in this frame, and the downlink identifier corresponding to the feedback can be explained, and each data packet of the downlink and uplink feedback resource can be uniquely determined The correspondence betwe...

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Abstract

The invention discloses a transmission method for broadcast / multicast feedback signaling, which comprises an uplink resource allocation process, a feedback signal generating process and a feedback signal sending process. The uplink resource allocation process is that all the child nodes which probably feed back to the same parent node allocate the same time frequency resource so as to support that transmission of the feedback signaling. In the feedback signal sending process, each child node checks first whether the locally received broadcast / multicast data packet is right or not; if an erroris found and cannot be corrected, an NAK signaling is sent at a given time frequency position corresponding to the data packet in the uplink resource allocation process. The broadcast / multicast feedback signal transmission method provides a method for multiplexing a plurality of feedback signals at the same time frequency position to make the spending of the broadcast / multicast feedback signal independent of the number of feedback nodes to save frequency spectrum resources and expand an effective application range of a feedback mechanism in a broadcast / multicast communication.

Description

technical field [0001] The invention belongs to the technical field of communication information, and relates to a transmission method of feedback signaling, in particular to a transmission method of broadcast and multicast feedback signaling. Background technique [0002] In traditional wireless communication systems, when transmitting broadcast signals, due to the consideration of feedback overhead and service delay, the HARQ feedback mechanism commonly used in data transmission is rarely used to improve performance, and more HARQ feedback mechanisms are used. Transmit power and enhanced coding (equivalent to reducing the signal transmission rate) to ensure the transmission performance of broadcast signals within the coverage area. With the development of some new technologies such as Relay / Mesh, this situation is expected to change. [0003] In the standardization process of the IEEE 802.16j working group, there is a proposal to improve the performance of multicast commu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/16H04W4/06
Inventor 戎璐戴沁芸闻世琦陆晔顼
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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