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Transmission method for broadcast/multicast feedback signaling

A transmission method and feedback signal technology, applied in the field of communication information, can solve the problems of consuming large spectrum resources, erroneous feedback, and large feedback overhead.

Inactive Publication Date: 2010-01-06
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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
Effect test

Embodiment 1

[0052] The present invention proposes a set of feedback signaling transmission schemes for the success or failure of the transmission of layer 2 data packets of the 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: the uplink resource allocation process of the broadcast / multicast feedback, and the generation and transmission process of the broadcast / multicast feedback signal.

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

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

[00...

Embodiment 2

[0082] Embodiment 2: A system in which the child node can estimate the transmission channel

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

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

Embodiment 3

[0095] Embodiment 3: General system

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

[0097] When the system sends a broadcast / multicast signal, a stream identifier can be assigned to the data stream in the downlink resource allocation signaling, indicating which users the stream is sent to, and indicating whether the stream supports feedback; while in the uplink resource allocation signaling In this frame, the corresponding uplink feedback resource can be allocated to the downlink broadcast / multicast data sent in this frame, indicating the downstream identifier corresponding to the feedback, and can uniquely determine each downstream data packet and the uplink feedback resource Correspondence between time-frequenc...

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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 present 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 considerations of feedback overhead and service delay, the HARQ feedback mechanism commonly used in data transmission is rarely used to improve performance, and high Transmission power and enhanced coding (equivalent to reducing the signal transmission rate) to ensure the transmission performance of the broadcast signal in the coverage area. With the development of some new technologies such as Relay / Mesh, this situation is expected to be changed. [0003] In the standardization process of the IEEE 802.16j working group, there is a proposal to improve the performance of multicast communication in the wireless Relay...

Claims

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Application Information

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IPC IPC(8): H04L1/16H04L1/18H04L12/18H04L12/56
Inventor 戎璐戴沁芸闻世琦陆晔顼
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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