Method and device for adjusting CWS (Contention Window Size) value at UE (User Equipment) side for UL (uplink) transmission

A technology of threshold value and feedback value, which is applied in the direction of transmission system, digital transmission system, error prevention/detection using return channel, etc., and can solve problems such as complex UL transmission

Active Publication Date: 2017-10-24
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, UL transmission is more complicated than DL transmission because the channel is multiplexed by multiple UEs during UL transmission

Method used

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  • Method and device for adjusting CWS (Contention Window Size) value at UE (User Equipment) side for UL (uplink) transmission
  • Method and device for adjusting CWS (Contention Window Size) value at UE (User Equipment) side for UL (uplink) transmission
  • Method and device for adjusting CWS (Contention Window Size) value at UE (User Equipment) side for UL (uplink) transmission

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Embodiment Construction

[0022] Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0023] figure 1 A flowchart of a method 100 for adjusting a CWS value for UL transmission at the UE side according to some embodiments of the present invention is shown. Wherein, in the method 100, the CWS value is adjusted based on the CCA measurement result.

[0024] As mentioned above, before UL transmission, the UE can perform multiple CCAs in one UL LBT cycle to determine the channel state. figure 2 A schematic diagram of the UL LBT...

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Abstract

The invention provides a method and a device for adjusting a CWS (Contention Window Size) value at a UE (User Equipment) side for UL (uplink) transmission. The CWS value is between a preset maximum CWS value and a minimum CWS value. The method comprises steps: in one UL LBT (Listen-before-Talk) cycle, multiple times of CCA (Clear Channel Assessment) are executed to determine the channel state measurement result in each time of CCA; and according to the channel state measurement results in the multiple times of CCA, the CWS value is adjusted to be used in a next UL LBT cycle.

Description

technical field [0001] The present invention generally relates to the field of wireless communication, and more specifically relates to a method and device for adjusting contention window size (Contention Window Size, CWS) on UE side for uplink (uplink, UL) transmission . Method for adjusting CWS value on UE side for UL transmission Background technique [0002] In the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) Rel-13, downlink (DL) transmission for licensed-assisted access (LAA) to unlicensed spectrum is specified (see reference [1]). Among them, Listen-before-Talk (LBT) is defined for LAA, which requires the base station to perform a channel access process before transmission, and transmit only when the process is successful. That is to say, before data transmission, a clear channel assessment (ClearChannel Assessment, CCA) will be performed (for example, using energy detection, carrier detection, or a combination thereof, etc.), and only when t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04W72/12H04W74/00
CPCH04L1/1806H04W72/1268H04W74/004H04W72/542H04W74/0816
Inventor 谷俊嵘刘建国陶涛孟艳王大卫骆喆沈钢
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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