TDC LTE (time division duplex long term evolution) system downlink two-carrier aggregation transmission-based uplink feedback method
A technology of carrier aggregation and transmission process, which is applied in the transmission system, digital transmission system, error prevention/detection using the return channel, etc., and can solve the problem of wasting air interface resources and so on
Inactive Publication Date: 2016-11-09
马伟
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The feedback that the HARQ-ACK result is any will cause uncertainty to the network side in determining the result of downlink data transmission. If the network device is conservative, it will determine any as NAK, which will constitute unnecessary retransmission and waste precious air interfaces. resource
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[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings and specific commercial examples.
[0021] Taking the classic configuration of my country's commercial network with uplink and downlink subframe configuration 2 (UL / DL CONFIG 2) and special subframe configuration 7 (SSF7) as an example, when the two downlink carriers are aggregated and fully scheduled, if the mobile phone side determines that the downlink data result is: Primary cell HARQ-ACK(0)=NAK, HARQ-ACK(1)=ACK, HARQ-ACK(2)=ACK, HARQ-ACK(3)=ACK; secondary cell HARQ-ACK(0)=NAK, HARQ - When ACK(1)=ACK, HARQ-ACK(2)=ACK, HARQ-ACK(3)=ACK, if not optimized by this patent, according to 3GPP 36.213 or ETSI TS 136 213, Section 10.1.3.2.1 Section PUCCH format 1b with channel selection HARQ-ACK procedure: When the downlink two carriers are aggregated and the uplink PUCCH is configured...
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The invention discloses a TDC LTE (time division duplex long term evolution) system downlink two-carrier aggregation transmission-based uplink feedback method. The method includes the following steps that: 1) in a TDD LTE downlink two-carrier aggregation transmission full-scheduling transmission process, a base station transmits downlink data to a terminal through a physical downlink shared channel; 2) according to the ratio of uplink subframes to downlink subframes, one uplink frame should feed back the demodulation results of four downlink frames; 3) if the demodulation result of the terminal side is that the transmission of HARQ-ACK multiplexing of a primary cell is HARQ ACK(0)=NAK,HARQ ACK(1)=ACK,HARQ ACK(2)=ACK, and HARQ ACK(3)=ACK, and when the transmission of HARQ-ACK multiplexing of a secondary cell is HARQ ACK(0)=NAK,HARQ ACK(1)=ACK,HARQ ACK(2)= ACK, and HARQ ACK(3)=ACK, the feedback of the terminal side is forced, so that the transmission of HARQ-ACK multiplexing of the primary cell is HARQ ACK(0)=ACK,HARQ ACK(1)=ACK,HARQ ACK(2)=ACK, and HARQ-ACK(3)=ACK, and when the transmission of HARQ-ACK multiplexing of the secondary cell is HARQ ACK(0)=ACK,HARQ ACK(1)=ACK,HARQ ACK(2)=ACK, and HARQ ACK(3)=ACK, terminal feedback is PUCCH resources 2, feedback bit Constellation is 1 and 0, and RM code Input Bits are 0,1,0 and 1; and(4) data transmission errors introduced by HARQ-ACK (0) feedback ACKs are solved by upper-layer retransmission. With the method of the invention adopted, the downlink data transmission rate of a system is greatly improved.
Description
technical field [0001] The invention relates to the field of Time Division Duplex (TDD, Time Division Duplex) Long Term Evolution (LTE, Long Term Evolution) public mobile communication, and is an optimization of an uplink feedback method for downlink two-carrier aggregation transmission based on the TDD LTE system. Background technique [0002] TD-SCDMA Long Term Evolution (TD-LTE, TD-SCDMA Long Term Evolution) system supports a variety of different carrier bandwidths, including 1.4MHz, 3 MHz, 5MHz, 10MHz, 15MHz, 20MHz, in order to meet the requirements of the International Telecommunication Union (ITU, International The peak rate of the advanced International Mobile Telecommunications (IMT-Advanced, International Mobile Telecommunication Advanced) system proposed by the Telecommunication Union reaches the requirements of 1Gbit / s downlink and 500Mbit / s uplink. The Third Generation Partnership Project (3GPP, 3 rd Generation Partnership Project) proposes the design goal of ex...
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IPC IPC(8): H04L1/16
CPCH04L1/1607
Inventor 不公告发明人
Owner 马伟