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Data retransmission method and equipment
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A data retransmission and retransmission technology, applied in the direction of digital transmission system, transmission system, using return channel for error prevention/detection, etc.
Active Publication Date: 2013-11-20
DATANG MOBILE COMM EQUIP CO LTD
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[0014] The embodiment of the present invention provides a data retransmission method and device for solving the problem of how the terminal performs non-adaptive retransmission
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Embodiment 1
[0061] Assuming that there are two codewords for three-layer transmission during the initial transmission, the first codeword is mapped to one layer, and the second codeword is mapped to two layers. The CS configuration of each layer during the initial transmission is {0, 6, 3}, OCC The configuration is {0, 0, 1}, where 0 and 1 represent two OCC patterns respectively.
[0062] If both codewords are to be retransmitted, the CS and OCC configurations used for the retransmission are the same as those for the initial transmission. The CS configuration is {0, 6, 3}, and the OCC configuration is {0, 0, 1};
[0063] If only the first codeword (corresponding to layer 1) needs to be retransmitted, the CS and OCC configurations used for retransmission are the configurations of the first port during the initial transmission, which are {0} and {0} respectively;
[0064] If only the second codeword (corresponding to layers 2 and 3) needs to be retransmitted, the first port can reuse the co...
Embodiment 2
[0069] Assume that there are two codewords for three-layer data transmission during initial transmission, where the first codeword maps to one layer, and the second codeword maps to two layers. The DMRS configuration indication index is 0 during the initial transmission, the CS configuration of each port indicated at this time is {0, 6, 3}, and the OCC configuration of each port is {0, 0, 1} (consistent with the DMRS configuration indication method in the background technology) . The processing of various retransmission situations is as follows:
[0070] If both codewords are to be retransmitted, the three-layer transmission configuration indicated by index 0 is still used for retransmission, the CS configuration is {0, 6, 3}, and the OCC configuration is {0, 0, 1} ; (same as first pass)
[0071] If only the first codeword (corresponding to layer 1) needs to be retransmitted, the configuration for single-layer transmission indicated by index 0 is used for retransmission, and...
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Abstract
The present invention discloses a data retransmission method and device, which relate to the technical field of wireless communications and are used for solving the problem of how a user device implements non-self-adaptive retransmission. The data retransmission method includes the following steps: a user device determines the codeword needed to be retransmitted and the ports used for retransmitting the codeword; according to the Cyclic Shift Indication (CSI) signal and the ports used for retransmitting the codeword, or according to the DeModulation Reference Symbol (DMRS) configuration used in the initial transmission, the user device determines the DMRS configuration of each port used for retransmitting the codeword in the codeword retransmission; and the user device retransmits the codeword at each port according to the determined DMRS configuration of the port. Thereby the DMRS configuration of the ports in the codeword retransmission is determined, and accordingly the codeword is retransmitted.
Description
technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a data retransmission method and device. Background technique [0002] The multiple-input multiple-output (MIMO) technology uses multiple antennas at both the transmitting end and the receiving end to transmit and receive, thereby greatly improving the transmission performance and capacity of the system. In uplink transmission, MIMO transmission can be implemented through two methods: Single User Multiple Input Multiple Output (SU-MIMO) and Multi UserMultiple Input Multiple Output (MU-MIMO). SU-MIMO uses spatial multiplexing technology to send multiple data streams of a user on the same time-frequency resource; while MU-MIMO uses the orthogonality between users to send data streams of multiple users on the same time-frequency resource. data. Without increasing the bandwidth, MIMO technology can double the capacity and spectral efficiency of the communica...
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