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Soft storage allocation method for hybrid automatic repeat request process of long term evolution system

A long-term evolution system, hybrid automatic retransmission technology, applied in the transmission system, digital transmission system, error prevention/detection using the return channel, etc., can solve the problem of high codec complexity and reduce soft storage resources Effect

Inactive Publication Date: 2013-07-10
SOUTHEAST UNIV
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Problems solved by technology

The longer the code length of the topological code, the closer the code word is to the random code, the better the performance, but the higher the complexity of the codec implementation, the less suitable for practical applications. Therefore, the long-term evolution system limits the length of a single topological coding block to It is 6144 bits. If the length of the transmission block is greater than this value, it will be divided into multiple encoding blocks, encoded in sequence and concatenated for output

Method used

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  • Soft storage allocation method for hybrid automatic repeat request process of long term evolution system
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  • Soft storage allocation method for hybrid automatic repeat request process of long term evolution system

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specific Embodiment approach

[0050] When any process i∈[1,N prcs ] The received transmission block, the process corresponds to a wrongly coded block-soft volume storage unit index current process mapping table M i ,i∈[1,N prcs ], the transport block can be divided into N coding blocks CB 1 ,CB 2 ,...,CB N , Indicates that it is rounded up, and A is the number of information bits contained in the transport block. The specific implementation is as follows:

[0051] If the transmission block received by the process is the first transmission, the specific implementation method is as follows:

[0052] S000: When the soft demodulation of the transmission block is completed, take the first coding block CB in the transmission block 1 Bit soft amount.

[0053] S001: For the current coding block CB j ,j∈[1,N] bit soft quantity solution rate matching, the result is stored in the public storage unit PSU, and then it is decoded by the iterative decoding algorithm based on the maximum a posteriori probability...

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Abstract

The invention discloses a soft storage allocation method for the hybrid automatic repeat request process of a long term evolution system. The method comprises the following steps of: a downlink shared channel of the long term evolution system adopts a multi-process hybrid automatic repeat request technology and maximally performs transmission for 4 times, a transmitter transmits a redundancy version of a transmission block every time and can transmit two transmission blocks at a time in a space division multiplexing mode, wherein the transmission block TB can be divided into N coded blocks CB1, CB2, ..., and CBN, [] represents rounding-up and A is the number of information bits of the transmission block; and only one process of a receiver in any downlink sub-frame receives a currently transmitted transmission block. By the method, soft storage resources required by the multi-process hybrid automatic repeat request process are effectively reduced. The method is applied to various usage scenarios of the long term evolution system, and is highly robust.

Description

technical field [0001] The invention provides a method for allocating soft volume storage in a hybrid automatic request retransmission process of a long-term evolution system, belonging to the technical field of digital communication data link layers in communication and information systems. Background technique [0002] 1. The physical layer transmission block of the LTE (3GPP Long Term Evolution, long-term evolution) system [0003] The data service in LTE (3GPP Long Term Evolution, long-term evolution) uses a topological coding scheme, and the data arrives at the coding unit in the form of a transmission block, and a transmission block is obtained in each transmission time interval (TTI). In the space division multiplexing mode, it can Send two transport blocks at the same time. The longer the code length of the topological code, the closer the code word is to the random code, the better the performance, but the higher the complexity of the codec implementation, the less...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/00
Inventor 赵春明赵欢姜明张华黄鹤
Owner SOUTHEAST UNIV
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