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Data retransmission method and system

A data retransmission and data technology, applied in diversity/multi-antenna system, error prevention/detection using return channel, spatial transmit diversity, etc., can solve the problem of high PDCCH signaling overhead and inability to take into account system scheduling flexibility PDCCH signaling Overhead, large number of bits, etc., to achieve the effect of reducing bit overhead

Inactive Publication Date: 2010-11-10
CHINA MOBILE COMM GRP CO LTD
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Problems solved by technology

Although the retransmission data can be flexibly scheduled on each carrier by using this retransmission method, it has better performance, but the information used to indicate the HARQ process occupies a large number of bits, and the total required: N×(log 2 N+3) the number of bits, resulting in a large PDCCH signaling overhead
[0008] To sum up, the existing data retransmission methods in the carrier aggregation system cannot take into account the scheduling flexibility of the system and the overhead of PDCCH signaling

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  • Data retransmission method and system
  • Data retransmission method and system

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Embodiment Construction

[0032] The inventor of the present invention analyzed the data retransmission method in the prior art, and found that in the above-mentioned second retransmission method in the prior art, since the PDCCH needs to target each data stream (such as data on different carriers) streams, or data streams on different time slots, or data streams sent through different antennas) must indicate the information of the process group to which the newly transmitted data corresponding to the retransmitted data belongs. Therefore, the overhead of PDCCH signaling is relatively large. The data retransmission method provided by the embodiment of the present invention does not indicate the information of the process group to which the corresponding newly transmitted data belongs to the retransmitted data in each data stream, but indicates the relative process group information of the retransmitted data in all data streams. In this way, the overhead of PDCCH signaling can be greatly reduced, and the...

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Abstract

The invention relates to the field of mobile communication, in particular to technology for saving packet dedicated control channel (PDCCH) signaling cost during data retransmission and provides a data retransmission system and a data retransmission method. The method comprises the following steps that: a base station distributes data to be transmitted to a mobile terminal to each data stream for transmitting in a first distribution mode; and the base station transmits the data to each data stream for retransmitting in a second transmission mode and currently transmitted PDCCH signaling carries information for indicating the difference between the second distribution mode and the first distribution mode. Since the base station carries information on the difference between a retransmitted data distribution mode and a newly transmitted data distribution mode in the PDCCH signaling and does not need carry information which indicates a process group to which the data in each data stream belongs, the base station is allowed to flexibly dispatch the data among different data streams and the overhead bit of the PDCCH signaling is reduced.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a technology for saving PDCCH signaling overhead when performing data retransmission. Background technique [0002] The demand for high data rates in wireless communication systems continues to grow. In 3GPP (the 3rd Generation Partner Project, 3rd Generation Partnership Project), the LTE-Adavance (LTE-A) system, which is an evolved version of LTE (Long Term Evolution, Long Term Evolution), can support a larger Bandwidth (100MHz max). Carrier aggregation meets the need for larger bandwidth of the LTE-A system by aggregating multiple existing LTE carriers together. [0003] For a UE (User Equipment, user equipment), each carrier has an independent transport block (TB, Transport block) (when spatial multiplexing is not considered) and a hybrid automatic repeat request (HARQ, Hybrid Automatic Repeat Request) entity. At this time, under the condition that flexible scheduling i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04W28/04H04W48/12H04W88/02H04W88/08H04B7/04
Inventor 雷蕾
Owner CHINA MOBILE COMM GRP CO LTD
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