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A method for realizing downlink harq when uplink and downlink subframe configurations are changed

A frame configuration and downlink technology, applied in the field of mobile communications, can solve the problems of large delay packet loss, performance loss, etc., and achieve the effect of solving abnormal situations

Inactive Publication Date: 2017-08-29
POTEVIO INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if dynamic subframe reconfiguration is used, at a small reconfiguration interval, a large number of RLC retransmissions will cause a large delay or even packet loss, resulting in a large performance loss

Method used

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  • A method for realizing downlink harq when uplink and downlink subframe configurations are changed
  • A method for realizing downlink harq when uplink and downlink subframe configurations are changed
  • A method for realizing downlink harq when uplink and downlink subframe configurations are changed

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Embodiment Construction

[0027] In order to make the technical principles, features and technical effects of the technical solution of the present application clearer, the technical solution of the present application will be described in detail below in conjunction with specific embodiments.

[0028] Embodiment 1 of the present application provides a solution to exception A.

[0029] Since the ACK / NACK signal of the PDSCH in the downlink subframe needs to be fed back, if abnormality A occurs, that is, the uplink subframe appears within the detection range of the PDSCH, it can be considered that the PDSCH of this subframe does not need to be retransmitted , that is, no NACK signal is fed back to the PDSCH in this uplink subframe. What is equivalent to this subframe feedback is the ACK signal for the PDSCH.

[0030] Therefore, Embodiment 1 of the present application proposes the following solutions for abnormality A:

[0031] When performing HARQ on the PDSCH in the previous radio frame according to ...

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Abstract

The application discloses a method for implementing downlink Hybrid Automatic Repeat reQuest (HARQ) under the change of uplink and downlink sub-frame configuration. Uplink and downlink sub-frame reconfiguration is performed after a wireless frame i ends. When HARQ is carried out at a wireless frame (i+1) on a physical downlink shared channel PDSCH in the wireless frame i according to a sub-frame set after uplink and downlink sub-frame reconfiguration, the following steps are performed: whether a corresponding sub-frame of the wireless frame i in the sub-frame set is a downlink sub-frame is judged, normal HARQ processing is carried out if the corresponding sub-frame of the wireless frame i in the sub-frame set is a downlink sub-frame, or a signal ACK is fed back to the sub-frame; whether sub-frames, corresponding to the wireless frame i and not belonging to the sub-frame set, in the wireless frame i include a downlink sub-frame is judged, and if sub-frames, corresponding to the wireless frame i and not belonging to the sub-frame set, in the wireless frame i include a downlink sub-frame, an uplink sub-frame is multiplexed as much as possible when available; and when no uplink sub-frame is available for multiplexing, the downlink sub-frame is enabled to perform feedback with an uplink sub-frame which corresponds to a downlink sub-frame, corresponding to the wireless frame i, in the sub-frame set and sends a HARQ feedback signal.

Description

technical field [0001] The present application relates to the technical field of mobile communication, in particular to Time Division Duplex Long Term Evolution (TDD-LTE), and in particular to a method for realizing downlink hybrid automatic repeat request (HARQ) when uplink and downlink subframe configurations change. Background technique [0002] The TDD-LTE system supports 7 different uplink and downlink subframe configurations. The TDD-LTE system can support dynamic subframe reconfiguration. Dynamic subframe reconfiguration means that each cell in the system can change the configuration of uplink and downlink subframes at a relatively small reconfiguration interval according to its own uplink and downlink service status. [0003] Dynamic subframe reconfiguration will bring about two beneficial effects in improving system performance: [0004] On the one hand, since each cell can determine its subframe configuration according to its own uplink and downlink business stat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18
Inventor 王莹李沛龙徐明月张纬栋黄岩陈哲
Owner POTEVIO INFORMATION TECH CO LTD