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Method and system for consulting time frequency resource, and node equipment

A technology of node and effective time period, applied in the field of cognitive radio, can solve the problems of reducing transmission time, low spectrum utilization rate, and estimating link quality, etc., and achieve the effect of reserving effective time period and improving spectrum utilization rate

Inactive Publication Date: 2013-10-09
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned time-frequency resource negotiation is based on the out-of-band negotiation mechanism, and it is impossible to estimate the quality of the reserved link before establishing data communication. Therefore, it is impossible to use a higher modulation method according to the link quality to achieve the purpose of reducing the transmission time, resulting in spectrum utilization. not tall

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  • Method and system for consulting time frequency resource, and node equipment
  • Method and system for consulting time frequency resource, and node equipment
  • Method and system for consulting time frequency resource, and node equipment

Examples

Experimental program
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Embodiment 1

[0048] see figure 1 , figure 1 It is a schematic flowchart of a time-frequency resource negotiation method provided by Embodiment 1 of the present invention. Such as figure 1 As shown, the method may include the steps of:

[0049] 101: Receive the RTS signaling sent by the source node to this node, the RTS signaling carries the set of available sub-channels of the source node and the length of the data packet to be sent by the source node;

[0050] Wherein, the source node can divide the available frequency resources into several sub-channels, and the source node can send the RTS preamble on each available sub-channel, or select only one available sub-channel to send the RTS preamble, so that the node can obtain the RTS preamble according to the RTS preamble Synchronize, and estimate the link quality of reserved subchannels.

[0051] Wherein, in one embodiment, the RTS preamble on each reserved sub-channel is sent on each available sub-channel in the set of available sub-c...

Embodiment 2

[0078] see image 3 , image 3 It is a schematic flowchart of a time-frequency resource negotiation method provided by Embodiment 2 of the present invention. Such as image 3 As shown, the method may include the steps of:

[0079] 301: Send RTS signaling to the destination node, the RTS signaling carries the available subchannel set of the node and the length of the data packet to be sent, so that the destination node can determine the set of reserved subchannels and the effective time period, and each reservation the data rate of the sub-channel;

[0080] For example, the node can send the RTS preamble on every available sub-channel, or select only one available sub-channel to send the RTS preamble, so that the destination node can obtain synchronization according to the RTS preamble, and estimate the link quality of the reserved sub-channel.

[0081] Wherein, in one embodiment, the RTS preamble on each reserved sub-channel is sent on each available sub-channel in the set...

Embodiment 3

[0100] see Figure 4 , Figure 4 It is a schematic flowchart of a time-frequency resource negotiation method provided by Embodiment 3 of the present invention. In this embodiment, it is assumed that the physical layer in the cognitive radio network adopts Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) technology. In OFDM technology, N subcarriers divide the entire working frequency band into N orthogonal subchannels, and the available spectrum resource of each node is a subset of the entire working frequency band. Such as Figure 5 As shown, the method may include the steps of:

[0101] 401: The source node monitors idle subchannels in the working frequency band, and constructs a set of available subchannels of the source node;

[0102] The source node monitors the entire working frequency band covered by the OFDM symbol when it is idle, and judges whether the status of each subchannel is idle. For example, if it is detected ...

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Abstract

The embodiment of the invention provides a method and a system for consulting a time frequency resource, and node equipment. The method comprises the following steps of: sending request sending signaling to a destination node, wherein the signaling carries an available sub-channel set of the node and the length of a data packet needing sending, so that the destination node determines a reserved sub-channel set, an effective time interval and the data rate of each reserved sub-channel; receiving clearing sending signaling sent by the destination node, wherein the clearing sending signaling carries the reserved sub-channel set and the effective time interval or carries the data rate, the reserved sub-channel set and the effective interval of each reserved sub-channel; and sending data transmission reserved signaling which carries the reserved sub-channel set and the effective time interval to an adjacent node. In the embodiment of the invention, an available time frequency source between nodes in a cognitive radio network can be consulted, so that the aim of reducing transmission time is fulfilled and the utilization ratio of a frequency spectrum is increased.

Description

technical field [0001] The present invention relates to the field of cognitive radio technology, in particular to a time-frequency resource negotiation method, system, and node equipment. Background technique [0002] In a cognitive radio network, the time resources and frequency resources available to nodes change dynamically. Therefore, before establishing data communication between nodes, time resources and frequency resources (referred to as time-frequency resources) must be negotiated. [0003] A time-frequency resource negotiation method is proposed in the prior art for negotiating available time-frequency resources between nodes in a cognitive radio network. The method adopts the industrial, scientific and medical (ISM , Industry-Science-Medical) frequency band for time-frequency resource negotiation, the negotiation process is as follows: [0004] 1. The source node sends a request to send (RTS, Request to Send) signaling to the destination node. The RTS signaling c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W28/18H04W28/26
Inventor 刘劲楠冯淑兰
Owner HUAWEI TECH CO LTD