Method and device of HARQ (Hybrid Automatic Repeat Request) on license-free carrier in LTE-LAA (Long Term Evolution-Licensed Assisted Access) system

An LTE-LAA, carrier technology, applied in transmission systems, digital transmission systems, error prevention/detection using return channels, etc., can solve problems such as low buffer management efficiency, and achieve convenient buffer management and maintenance, and carrier switching is reduced. Effect

Active Publication Date: 2016-03-30
ALCATEL LUCENT SHANGHAI BELL CO LTD +1
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Problems solved by technology

On the other hand, if the soft buffer is kept longer and the unlicensed channel cannot be used for retransmission, the efficiency of buffer management at UE side is low

Method used

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  • Method and device of HARQ (Hybrid Automatic Repeat Request) on license-free carrier in LTE-LAA (Long Term Evolution-Licensed Assisted Access) system
  • Method and device of HARQ (Hybrid Automatic Repeat Request) on license-free carrier in LTE-LAA (Long Term Evolution-Licensed Assisted Access) system
  • Method and device of HARQ (Hybrid Automatic Repeat Request) on license-free carrier in LTE-LAA (Long Term Evolution-Licensed Assisted Access) system

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[0031] Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the invention are shown in the drawings, it should be understood that the invention 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 invention to those skilled in the art.

[0032] Considering the opportunistic and intermittent characteristics of the license-exempt carrier, two implementations are proposed to solve the problem of HARQ retransmission on the license-exempt carrier in the LTE-LAA system.

[0033] image 3 A schematic diagram of a method 300 for HARQ retransmission on an unlicensed carrier in an LTE-LAA system according to a first embodiment of the present invention is shown. like image 3 As shown in , the method 3...

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Abstract

The present invention provides a method and device of HARQ (Hybrid Automatic Repeat Request) on a license-free carrier in an LTE-LAA system. The implementation method in a base station comprises that: when the base station and user equipment work on the license-free carrier, the base station and the user equipment are configured to perform CCA (Clear Channel Assessment) detection for the license-free carrier to determine the energy on the license-free carrier, and at the same time an HARQ discard timer aiming at the license-free carrier is started; the determined energy is compared with a preset CCA threshold value; if the energy on the license-free carrier is not less than the energy of the CCA threshold value until the HARQ discard timer is time out, the HARQ is not carried out on the license-free carrier; if the energy on the license-free carrier is lower than the energy of the CCA threshold value prior to the timeout of the HARQ discard timer, the HARQ is continually carried out on the license-free carrier.

Description

technical field [0001] The present invention generally relates to the field of wireless communication, and more specifically, relates to a hybrid automatic repeat request (HARQ) on a license-exempt carrier in a Long Term Evolution-Licensed Assisted Access (LTE-LAA) system. HybridAutomaticRepeatRequest, HARQ) retransmission method and device. Background technique [0002] As business demands continue to grow, mobile operators plan to evaluate the feasibility of using license-free frequency bands in LTE Release-13 to increase network capacity. The initial idea of ​​LTE-LAA is to use carrier aggregation (CarrierAggregation, CA) technology to aggregate license-exempt carriers into a supplemental downlink (Supplemental Downlink, SDL), the main carrier of which is located in the licensed frequency band. [0003] Different from the exclusive use of the licensed spectrum, the unlicensed spectrum is shared by a variety of radio access technologies (Radio Access Technology, RAT), suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18
CPCH04L1/1877H04L27/0006H04L1/1812H04L1/1874H04L1/1887H04W16/14
Inventor 韩锋T·胡黄晟锋
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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