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Method for demultiplexing WCDMA down channel

A channel and transmission channel technology, applied in the field of mobile communication, can solve problems such as unbearable processing delay, huge total storage capacity, and increased system complexity

Inactive Publication Date: 2002-05-01
INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, demultiplexing the data stream directly according to the method will greatly increase the complexity of the system
First of all, this method has many steps, and the data needs to be cached between each step, and the highest data rate supported by the system can reach 2Mb / s. For the service with a TTI of 80ms, each step requires a 160kb cache, and The total storage capacity is huge
Secondly, the processing delay caused by frequent writing and reading of data streams is unbearable

Method used

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  • Method for demultiplexing WCDMA down channel
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  • Method for demultiplexing WCDMA down channel

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Embodiment Construction

[0049] In the specific implementation, for the CCTrCH processing part, in order to calculate the address after the second interleaving and code channel combination, the sequential address of the data in the single code channel is first generated, and the row number m and column of the data in the interleaver are obtained from the address No. n', then according to the principle of interleaving for the second time (row writing, column reading, column interleaving), the column number n before interleaving is obtained by row number n' look-up table, then the address of the data before interleaving is intl_addr=m ×30+n. In addition, since each code channel data is transmitted in parallel, that is, the input data is sequentially: the 0th data of code channel 0, the 0th data of code channel 1, ... the 0th data of code channel x, the 0th data of code channel 0 The first data of ,……. Therefore, on the basis of intl_addr, the storage start address iniadr of the code track in the cache ...

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Abstract

A method for demultiplexing WCDMA down channels and its demultiplexer is disclosed, which is characterized by more functions including demultiplexing, speed match and de-interlacing, and use of a moving algorithm based on address calculation. Its advantages are less complexity, low delay and less memory space.

Description

(1) Technical field: [0001] The invention belongs to the field of mobile communication, in particular to the channel demultiplexing technology of multimedia services in the field of third-generation mobile communication. (two) background technology: [0002] The multiplexing and channel coding scheme of WCDMA mainly includes CRC check, error correction coding, rate matching, interleaving and so on. The specific coding multiplexing method of the downlink is shown in Fig. 1 . Wherein, each transport channel (TrCH) carries a service, and for services with different delay requirements, the transmission time interval (TTI) is different (TTI∈{10ms, 20ms, 40ms, 80ms}). [0003] For the downlink, first divide the input data within a transmission time interval (TTI) of each transport channel into transport blocks, and add CRC check bits at the end of each block to facilitate error detection at the receiving end. Secondly, the data after the check digit is added is packed in units o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04B1/00H04B7/26H04J13/00
Inventor 肖立民许希斌周世东
Owner INST OF TELECOMM TRANSMISSION MINIST OF INFORMATION IND