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Control method for downlink data reception of mobile communication terminal and mobile communication terminal

A technology for mobile communication terminals and downlink data, applied in wireless communication, error prevention/detection using return channels, digital transmission systems, etc., can solve problems such as retransmission HARQ residues, errors, and reliability cannot be guaranteed, and achieve saving The effect of power loss

Active Publication Date: 2010-07-14
CHINA MOBILE COMM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sometimes when the coverage radius of the cell is large, the reliability of ACK / NACK feedback from users at the edge of the cell cannot be guaranteed, and ACK / NACK errors will cause unnecessary retransmissions or residual errors in HARQ

Method used

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  • Control method for downlink data reception of mobile communication terminal and mobile communication terminal
  • Control method for downlink data reception of mobile communication terminal and mobile communication terminal
  • Control method for downlink data reception of mobile communication terminal and mobile communication terminal

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Embodiment Construction

[0034] In the embodiment of the present invention, considering the use of the ACK / NACK repetition mechanism in the TDD system, the eNB makes a judgment after receiving the last ACK / NACK to decide whether to retransmit failed data or send new data. Since the mobile communication terminal starts the HARQ RTT Timer when it receives the downlink data transmission instruction, and then according to whether the downlink data is correctly received after the downlink data arrives, several consecutive uplink subframes, according to the configured retransmission times, feedback to the base station whether multiple Correctly receive the indication information ACK or NACK of the downlink data. The eNB will make a judgment after receiving the last ACK or NACK. If the judgment result is NACK, the downlink data will be retransmitted. Therefore, the optimal timing duration T1 of the HARQ RTT Timer is three parts The sum of time is calculated according to the following formula:

[0035] T1=kt+...

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Abstract

The invention relates to a mobile communication technology, and provides a control method for downlink data reception in a TDD system and a mobile communication terminal, wherein the control method is used for reducing the electric power consumption of the mobile communication terminal. In the embodiment of the invention, when a technology of repeatedly sending ACK or NACK is adopted in the TDD system, the timing duration of a HARQ RTT Timer is set as the length which is smaller than or equal to T1 and larger than or equal to T2 and is multiples of the endurance time of any single subframe, and under the condition of ensuring the reception of retransmission data which is possible to reach within the shortest time, compared with a mode of directly adopting the set timing duration of the HARQ RTT Timer when the ACK or the NACK is not repeatedly sent, the electric loss of the mobile communication terminal is saved.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a technology for receiving downlink data by a mobile terminal in a TDD system. Background technique [0002] The Discontinuous Reception (DRX) function allows the user equipment (UserEquipment: UE) to turn off the receiver under certain conditions without having to listen to the Physical Downlink Control Channel (PDCCH) all the time, thereby saving UE power the goal of. [0003] The basic principle of DRX is as follows figure 1 As shown, the DRX cycle is composed of a continuous PDCCH listening phase (OnDuration) and a possible dormancy phase (Opportunity for DRX). The unit of the length of the On Duraion phase and the Opportunity for DRX phase is the number of subframes. In the On Duration phase, the UE must continuously listen to each subframe containing the PDCCH to obtain the resource allocation indication for uplink and downlink transmission of each subframe, and determin...

Claims

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Application Information

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IPC IPC(8): H04W52/02H04L1/18
CPCH04L1/1848H04L1/188Y02B60/50H04L1/1812
Inventor 谢芳胡臻平崔春风
Owner CHINA MOBILE COMM GRP CO LTD
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