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A method for implementing uplink channel access in an elaa-based communication system

A channel access and communication system technology, which is applied in the field of assisting user equipment to maintain the contention window size, and can solve problems such as HARQ-ACK reliability reduction

Active Publication Date: 2021-07-06
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the eNB does not keep retransmitting a certain HARQ process (and thus puts this on the transmission of higher layers, which will e.g. cause additional delay and in the end cause a lot of overhead), the reliability of HARQ-ACK will be reduced

Method used

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  • A method for implementing uplink channel access in an elaa-based communication system
  • A method for implementing uplink channel access in an elaa-based communication system
  • A method for implementing uplink channel access in an elaa-based communication system

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Embodiment Construction

[0022] In this disclosure, a design scheme for uplink LBT type 4 is proposed to support multiple QoS services in uplink LAA. This LBT design scheme supported by eNB has at least the following characteristics:

[0023] Determination of a set of uplink channel access parameters

[0024] A set of uplink channel access parameters corresponding to the LBT priority should be determined before the UE implements LBT type 4 operation. The eNB shall determine the channel access parameters by considering at least the following factors:

[0025] - the transmission time of the uplink transmission data block;

[0026] - the number of scheduled UEs in the uplink transmission data block;

[0027] - service type and interference situation of the scheduled UE;

[0028] - LAA TDD configuration;

[0029] - some or all of the above factors.

[0030] In the embodiment of the present invention, the uplink channel access parameters determined by the eNB should be further acquired by the UE. Th...

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Abstract

The present invention provides a method for assisting user equipment in implementing uplink channel access in a base station of an eLAA-based communication system, the method comprising: determining a pre-session listening priority for the user equipment; The user equipment sends first signaling indicating the determined pre-session listening priority. Through the present invention, an enhanced uplink channel access mechanism is proposed. In this mechanism, eNB can provide some assistance to facilitate uplink access. This solution can increase the multiplexing opportunities and spectrum efficiency of multiple users in LAA uplink.

Description

technical field [0001] The present invention relates to mobile communication technology, in particular to a method for implementing uplink channel access in an eLAA-based communication system, and a method for assisting user equipment in maintaining contention window size in a base station of an eLAA-based communication system method. Background technique [0002] In RAN#70, a work item related to enhanced LAA for LTE (eLAA-LTE) was approved to support the secondary cell of Licensed-Assisted Access (LAA) on the uplink unlicensed band run. As one of the most important mechanisms to ensure the fairness of coexistence: Listen-Before-Talk (LBT), the LBT must be precisely designed. In the current ETSI BRAN discussion, it is very likely to support uplink transmission within the maximum channel occupancy time (maximum channel occupancy time, MCOT) acquired by the base station (eNB). In this case, a one-shot Clear Channel Assessment (CCA) of 25us in LBT operation is sufficient to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W74/08
CPCH04W74/0875H04W74/0808H04W16/14H04W72/23H04W72/121H04W74/006
Inventor 陶涛刘建国孟艳谷俊嵘王大卫骆喆沈钢
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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