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Method and device for channel measurement

A channel measurement and feedback channel technology, applied in wireless communication, advanced technology, electrical components, etc., can solve the problems of short working time, can not be used alone, long sleep time, etc., to reduce power consumption, reduce transmission volume, meet the The effect of energy saving needs

Active Publication Date: 2018-09-04
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 802.11n technical specification, the channel measurement notification refers to the NDP Announcement bit indication of the MAC frame header of the wireless frame, and by default only the receiver of this frame needs to receive the subsequent NDP for channel measurement; in the 802.11ac technical specification , defines a special channel measurement notification wireless frame, called VHT NDP Announcement frame, this notification frame can instruct one or more receivers to receive subsequent NDP for channel measurement; in these two technical specifications, there is a channel measurement notification The wireless frame and NDP of the function exist as a frame sequence and cannot be used alone
[0006] Based on the analysis of 802.11ah application scenarios, especially the perception application scenarios, the working time of the station is short and the sleeping time is long, and the working scene may be a high Doppler frequency shift scene. If the wireless frame with the channel measurement notification function is still used The mechanism of channel measurement with NDP, the necessity of sending wireless frames with channel measurement notification function is very low, and it is not conducive to energy saving, so the existing channel measurement mechanism is not fully suitable for 802.11ah technology

Method used

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  • Method and device for channel measurement
  • Method and device for channel measurement

Examples

Experimental program
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Effect test

Embodiment 1

[0064] Assume that an 802.11ah network includes 1 AP and 2 STAs, denoted as STA1 and STA2 respectively, where AP is configured with N transceiver antennas, STA1 is configured with N1 transceiver antennas, STA2 is configured with N2 transceiver antennas, and N, N1 and STA2 are configured with The value range of N2 is a natural number greater than or equal to 1.

[0065] At this time, there is data to be transmitted for STA1 in the AP, but the AP does not have the channel information of the link between the AP and STA1. The AP needs STA1 to perform channel measurement and feed back the channel measurement information to the AP for use by the AP. At this time, the AP is the channel The measurement requester, STA1 is the channel measurement feedback party.

[0066] After the AP obtains the channel access opportunity, it sends the channel measurement frame NDP. The NDP is composed of the short training sequence field, the first part of the long training sequence field, the signalin...

Embodiment 2

[0074] Assume that in an 802.11ah network, there is 1 AP and 2 STAs, denoted as STA1 and STA2 respectively, where AP is configured with N transceiver antennas, STA1 is configured with N1 transceiver antennas, STA2 is configured with N2 transceiver antennas, N, N1 and N2 The value range of is a natural number greater than or equal to 1.

[0075]At this time, there is data to be transmitted for STA1 in the AP, but the AP does not have the channel information of the link between the AP and STA1. The AP needs STA1 to perform channel measurement and feed back the channel measurement information to the AP for use by the AP. At this time, the AP is channel measurement The requester, STA1 is the channel measurement feedback party.

[0076] After the AP obtains the channel access opportunity, it sends the channel measurement frame NDP. The NDP is composed of the short training sequence field, the first part of the long training sequence field, the signaling field and the second part of...

Embodiment 3

[0084] Assume that in an 802.11ah network, there is 1 AP and 2 STAs, denoted as STA1 and STA2 respectively, where AP is configured with N transceiver antennas, STA1 is configured with N1 transceiver antennas, STA2 is configured with N2 transceiver antennas, N, N1 and N2 The value range of is a natural number greater than or equal to 1.

[0085] At this time, there is data to be transmitted for STA1 in the AP, but the AP does not have the channel information of the link between the AP and STA1. The AP needs STA1 to perform channel measurement and feed back the channel measurement information to the AP for use by the AP. At this time, the AP is channel measurement The requester, STA1 is the channel measurement feedback party.

[0086] After the AP obtains the channel access opportunity, it sends the channel measurement frame NDP. The NDP is composed of the short training sequence field, the first part of the long training sequence field, the signaling field and the second part o...

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Abstract

The invention discloses a method and a device for channel measurement. The method includes that a channel measurement requester sends out a wireless frame, channel measurement requester identity information, channel measurement feedback party identity information and channel measurement feedback indication information are carried in a signaling domain of a physical frame head of the wireless frame, and the channel measurement feedback party is instructed to perform the channel measurement according to the channel measurement feedback indication information. By the method, completion of channel measurement notice and channel measurement functions can be ensured, sending amount of the wireless frame can be reduced, transmission efficiency can be improved, load expenses of transmission can be effectively lowered, power consumption can be lowered, and energy-saving demand can be met to a certain degree.

Description

technical field [0001] The invention relates to the technical field of computer network and wireless communication, in particular to a channel measurement method and device. Background technique [0002] Currently, in the wireless network field, the wireless local area network (WLAN) develops rapidly, and the global demand for WLAN coverage is increasing day by day. The IEEE802.11 Working Group of the Institute of Electrical and Electronics Engineers has successively defined a series of WLAN technical standards such as 802.11a, 802.11b, and 802.11g, mainly formulating physical layer (PHY) and media access control (MAC) layer specifications. Subsequently, other task groups emerged one after another, dedicated to the development of specifications related to the improvement of existing 802.11 technologies. For example, the 802.11ah task group mainly aimed at utilizing the resources of the license-free frequency band below the 1GHz frequency band to support smart grids, sensor n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/02
CPCY02D30/70
Inventor 田开波姜静孙波邢卫民
Owner ZTE CORP
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