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LTE-U idle channel evaluation method based on multi-slot fusion mechanism

An idle channel assessment and multi-slot technology, applied in wireless communication, transmission monitoring, network planning, etc., can solve problems such as lack of accuracy, and achieve the effects of avoiding channel resources, reducing the probability of missed detection, and reducing the probability of false alarms

Active Publication Date: 2017-02-15
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] In view of this, in view of the lack of accuracy of ED-CCA in judging the channel state when the sampling window is not completely aligned with the WIFI data packet in the actual environment, the purpose of the present invention is to provide a LTE-U idle time slot based on a multi-slot fusion mechanism. In the channel assessment method, in LTE-U equipment, the CCA sampling window is divided into multiple time slots, and the received data of each time slot is weighted with unequal weights by using the eigenvalue information of the received signal, and then the weighted data is fused to generate a global Detection statistics (Global Test Statistics, GTS), and make a final threshold decision

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[0028] The present invention proposes an MS-CCA idle channel assessment method based on a multi-slot fusion mechanism, including: an LTE-U terminal or a base station performs CCA before requesting access to a channel in an unlicensed frequency band, and performs data processing on the target channel within the CCA window. sampling. The present invention divides the CCA window under the LBT mechanism into S (S>1) time slots of equal duration, and utilizes N' sampling data in each time slot to construct a signal sampling matrix Y (S×N'); according to the sampling Matrix Y calculates its covariance matrix R y , and subsequently calculate the covariance matrix R y eigenvalues, arrange the S eigenvalues ​​in ascending order, and use them as diagonal elements to construct a diagonal matrix Λ, use Λ to unequally weight the signal sampling matrix Y according to the weighted fusion method to generate a global detection statistic T MS-CCA , and finally using T MS-CCA Make the final j...

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Abstract

The invention relates to an LTE-U idle channel evaluation method based on a multi-slot fusion mechanism, and belongs to the technical field of LTE-U (LTE in unlicensed spectrum) in mobile communication. An LTE-U system works in an unauthorized frequency range, and before the system access a channel, idle channel evaluation is needed generally. The LTE-U system divides the whole CCA window into multiple slots; sampling data of the multiples slots is used to generate a sampling matrix, a covariance matrix of the sampling data is calculated to obtain characteristic values, the characteristic values in ascending order are used to carry out unequal weighting on the corresponding slots, and the channel state evaluation performance when the CCA window is not completely aligned with a data packet is improved. The idle channel evaluation method can be used to improve the accuracy of channel state determination effectively, reduce the possibility of data packet collision among different systems, and the improves the spectral efficiency that the LTE-U system and a WIFI system coexist in the same channel in the unauthorized frequency range.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to the technical field of idle channel assessment when an LTE-U (LTE inunlicensed spectrum) system on an unlicensed frequency band accesses a channel, and relates to an LTE-U idle channel assessment based on a multi-slot fusion mechanism method. Background technique [0002] LTE-U is an emerging technology proposed by 3GPP in recent years to alleviate the communication load pressure on licensed frequency bands. It enables operators to deploy LTE systems in unlicensed frequency bands (public frequency bands). Utilizing the technical advantages of LTE can improve the spectral efficiency of unlicensed frequency bands, and at the same time alleviate the communication pressure on existing licensed frequency bands by transferring traffic from licensed frequency bands to unlicensed frequency bands. Due to the regional opening policy of the unlicensed frequency band and the ...

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Application Information

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IPC IPC(8): H04W16/14H04W24/02H04W28/02H04W28/04H04B17/382
CPCH04B17/382H04W16/14H04W24/02H04W28/0252H04W74/085
Inventor 申滨赵思聪黄磊郑建宏
Owner CHONGQING UNIV OF POSTS & TELECOMM
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