Carrier sense method and system

A technology for requesting frames and transmission channels, applied in the field of communication, can solve problems such as transmission conflicts, difficulties in providing transmission channels, return errors, etc., and achieve the effect of reducing power consumption
CN102595569AInactive Publication Date: 2012-07-18HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUAWEI TECH CO LTD
Publication Date
2012-07-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a carrier sense method and a system. According to the method, a transmitting terminal sends an idle channel to assess clear channel assessment (CCA) request frames on a main channel of a transmission channel which needs to be detected; the transmitting terminal sends request to send (RTS) frames on the transmission channel which needs to be detected after sending a point coordination function inter-frame space (PIFS) subsequent to transmission of the CCA request frame; and the transmitting terminal performs data transmission on the transmission channel transmitting clear to send (CTS) frames after receiving an indication that CTS frames are permitted to send. The invention also discloses the carrier sense system, which comprises a transmitting terminal and a receiving terminal. According to the method and the system, the power consumption of the receiving terminal is reduced and reliable CCA results of all transmission channels are provided.
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Description

technical field

[0001] The present invention relates to the field of communication technology, in particular to a carrier sensing method and system. Background technique

[0002] In IEEE802.11 Wireless Local Area Network (WLAN), the distributed channel access feature makes the carrier sense mechanism the key to avoid transmission conflicts. In the carrier sense mechanism, before the sender starts to transmit data, it needs to perform clear channel assessment detection on the transmission channel through the clear channel assessment (CCA, Clear Channel Assessment) module to determine whether the transmission channel is idle, and only when the transmission channel is idle The data transfer starts only when the However, in an actual application environment, it is impossible for the sending end to detect the transmission channel conditions of all other devices. For example, if figure 1 as shown, figure 1 Data transmission is in progress between the station 1 (STA1) and the a...

Claims

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