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

Inactive Publication Date: 2012-07-18
HUAWEI TECH CO LTD
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

However, since the receiving device does not perform CCA detection on the sub-channel, it will not be able to provide reliable CCA results for the sub-channel, so the receiving device may return an incorrect CTS frame to the transmitting device (for example, when a certain sub-channel is being used , but the receiving device returns a CTS frame to the transmitting device, informing the transmitting device that the sub-channel is idle), resulting in a transmission conflict
[0008] In summary, in the prior art carrier sense method, the power consumption of the receiving device is relatively large; and if the power consumption of the receiving device is reduced, it will be difficult to provide reliable CCA results for all transmission channels

Method used

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  • Carrier sense method and system

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Experimental program
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Embodiment Construction

[0036] In an embodiment of the present invention, a method for data transmission is proposed, the method comprising:

[0037] The sending end sends a free channel assessment CCA request frame on the main channel in the transmission channel that needs to be detected, and after sending the point coordination function frame interval PIFS after sending the CCA request frame, sends the transmission on the transmission channel that needs to be detected request RTS frame;

[0038] After receiving the permission to send the CTS frame, the sending end performs data transmission on the transmission channel for transmitting the CTS frame.

[0039] In an embodiment of the present invention, a method for listening to a data carrier is also provided, the method comprising:

[0040] The receiving end evaluates the CCA request frame according to the free channel received from the main channel in its transmission channel, performs CCA detection on all transmission channels of the receiving en...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/02H04W74/08
CPCH04W74/0816Y02B60/50Y02D30/70
Inventor 伍天宇杨讯李云波
Owner HUAWEI TECH CO LTD
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