Method for triggering LBT (Listen-before-talk) random backoff mechanism in LTE LAA (Long Term Evolution Licensed-Assisted Access)

A random back-off and mechanism technology, applied in signaling distribution, digital transmission systems, electrical components, etc., can solve the problems of not being able to correctly reflect collisions, and not be able to effectively trigger the contention window, and achieve the effect of improving utilization.

Active Publication Date: 2017-01-04
ALCATEL LUCENT SHANGHAI BELL CO LTD +1
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Problems solved by technology

However, ACKs originating from retransmissions do not correctly reflect that a collision did not occur, and retransmission successes may be due to combining gains in Hybrid Automatic Repeat (HARQ)
[0015] None of the above solutions can effectively trigger and reasonably specify or configure the size of the competition window

Method used

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  • Method for triggering LBT (Listen-before-talk) random backoff mechanism in LTE LAA (Long Term Evolution Licensed-Assisted Access)
  • Method for triggering LBT (Listen-before-talk) random backoff mechanism in LTE LAA (Long Term Evolution Licensed-Assisted Access)

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Embodiment Construction

[0050] In the following detailed description of the preferred embodiment, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings show, by way of example, specific embodiments in which the invention can be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments in accordance with the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. Accordingly, the following detailed description is not limiting, and the scope of the invention is defined by the appended claims.

[0051] The present application proposes a method for triggering a random backoff mechanism of Listen Before Talk (LBT) in Long Term Evolution Assisted Licensed Spectrum Access (LTELAA). figure 1 Shows a flowchart 100 of a method for triggering a random backoff mechanism of Listen Before Talk (LBT) in Long Term Ev...

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Abstract

The invention relates to a method for triggering a listen-before-talk (LBT) random backoff mechanism in long term evolution licensed-assisted access (LTE LAA). The method comprises the steps of evaluating a current channel to obtain a first parameter representing a congestion state of the current channel, comparing the first parameter with a first threshold to obtain a first comparison result, and adapting the size of a contention window according to the first comparison result. The method further comprises the steps of comparing the first parameter with a second threshold to obtain a second comparison result, and adapting the size of the contention window according to the second comparison result. The first parameter is a packet error rate parameter or a collision parameter. The method innovatively uses the comparison between the first parameter representing the congestion state of the current channel and the threshold to correspondingly increase or decrease the size of the contention window according the comparison result, so that the fairness with other systems, such as a WiFi system, is guaranteed, the utilization rate of communication resources and the performance of the whole wireless communication system are also improved correspondingly.

Description

technical field [0001] The present invention generally relates to the field of wireless communication, and more specifically relates to a [0002] Used for triggering in Long Term Evolution Assisted Licensed Access (LTE LAA) [0003] A method for a random backoff mechanism for listen-before-talk (LBT). Background technique [0004] 3GPP is studying the feasibility of using LTE on the unlicensed frequency band and how to ensure the fair coexistence of the LTE system on the unlicensed frequency band and other technologies such as Wi-Fi on the same frequency band. In the RAN1#78bis meeting, the following consensus was reached: that is, the listen-before-talk (LBT: Listen-before-talk) mechanism is a clearly required function to meet the regulatory requirements in some areas / frequency bands of the LAA system, This is described in "RAN1Chairman's Notes for 78bismeeting". In the RAN1#80 meeting, the following four LBT schemes for LAA channel access are listed: [0005] - The fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04W74/085H04W74/0825H04L1/1812H04L5/0055H04L43/0823H04L43/16H04W28/0289H04W74/0841
Inventor 陶涛刘建国韩锋孟艳叶思根谷俊嵘王丹丹沈钢
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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