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Decoding of messages with known or hypothesized difference

A message and difference technology, applied in the field of decoding, can solve the problems of consuming system resources and reducing system throughput.

Inactive Publication Date: 2018-02-06
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One disadvantage is that this consumes system resources and reduces achievable system throughput by up to 5.2Mbps (assuming 64QAM and 4 layers) or about 450Gb / day in each cell supporting extended coverage

Method used

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  • Decoding of messages with known or hypothesized difference
  • Decoding of messages with known or hypothesized difference
  • Decoding of messages with known or hypothesized difference

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0222] MIB example 1: {1 0 1 0 0 0 0 1 1 1 1 1 1 0 1 1 0 1 0 0 1 1 1 0}

MIB example 2

[0223] MIB example 2: {1 0 1 0 0 0 0 1 1 1 1 1 1 1 1 1 0 1 0 0 1 1 1 0}

[0224]The initial and final states differ between code blocks due to different CRC checksums, but by using state transition masks, states are connected to each other and decoding can be based on joint metrics. After backtracking, the decoded first and second messages (corresponding to CRC encoded MIB instances 1 and 2) can be extracted as illustrated by 510 and 520 .

[0225] More generally, the decoding method can be described via the following methods and decoders.

[0226] Method of a communication device decoding a first message

[0227] The first message and the second message are coded to generate a first codeword and a second codeword, respectively. The code is represented as a state machine and a state transition of the state machine has a previous state and a subsequent state and is associated with a corresponding segment of the codeword.

[0228] The method includes receiving the first and...

example （ example ）

[0481] initial access (cell selection),

[0482] • idle mode mobility (cell reselection),

[0483] • connection mode mobility (handover),

[0484] • SI updates; and

[0485] • CGI acquisition (Closed Subscriber Group (CSG) Mobility, Self-Organizing Network (SON) / Automatic Neighbor Relations (ANR))

[0486] exist initial access , the device searches for a first cell to attach the network to. Once a cell has been detected by means of detection of a synchronization signal, the device reads the MIB to obtain information about the DL bandwidth and PHICH configuration in use, as well as the current system frame number. With this information, the device is able to tune its radio receiver to the correct bandwidth and start receiving system information, which carries the information needed for the device to perform random access towards the cell and further attach to the particular network to which the cell belongs.

[0487] exist idle mode mobility In , the device detects neig...

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PUM

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Abstract

Decoding of a first message is disclosed, wherein first and second messages are encoded by a code (represented by a state machine) to produce first and second code words, which are received over a communication channel. A plurality of differences (each corresponding to a hypothesized value of a part of the first message) between the first and second messages are hypothesized. An initial code wordsegment is selected having, as associated previous states, a plurality of initial states (each associated with a hypothesized difference and uniquely defined by the hypothesized value of the part of the first message). The first message is decoded by (for each code word segment, starting with the initial code word segment): determining first and second metrics associated with respective probabilities that the code word segment of the first and second code word (respectively) corresponds to a first message segment content, the probability of the second metric being conditional on the hypothesized difference of the initial state associated with the previous state of the state transition corresponding to the first message segment content, determining a decision metric by combining the first and second metrics, and selecting (for the first message) the first message segment content or a second message segment content based on the decision metric. If the first message segment content is selected, the subsequent state of the state transition corresponding to the first message segment content is associated with the initial state associated with the previous state of the state transition.

Description

technical field [0001] The present disclosure relates generally to the field of decoding. More specifically, it concerns the decoding of messages with known or assumed discrepancies. Background technique [0002] Specific examples and scenarios where some of the embodiments are applicable are given herein. However, it should be understood that some embodiments may be equally applicable with respect to other examples and scenarios. [0003] Machine Type Communication in Enhanced Coverage [0004] There is a current work item (3GPP RP-130848) in 3GPP (3rd Generation Partnership Project) on "Low cost & enhanced coverage MTC UE for LTE (Low cost & enhanced coverage MTC UE for LTE)". One goal of the work item is to significantly improve the coverage of Machine Type Communication (MTC) devices for LTE. One purpose of the work item is to improve support for such devices under poor radio conditions; these devices typically have low data rate requirements and are delay tolerant....

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/08
CPCH04L1/0054H04L1/0059H04L1/08H03M13/413H03M13/6306H03M13/4107G06F18/21355H04W4/70
Inventor J.阿克蒙B.林多夫A.瓦尔伦
Owner TELEFON AB LM ERICSSON (PUBL)