CQI And PCI Bit Encoding With Unequal Error Protection
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Solution Overview
Problem
Conventional 3GPP wireless communication systems face system capacity degradation due to incorrect reception of CQI bits, which are transmitted without cyclic redundancy check, leading to significant errors in downlink scheduling, especially affecting the most significant bits.
Innovation Solution
A method of encoding CQI and PCI bits using linear block coding with unequal error protection, where the generator matrix is designed to provide more protection to the most significant bits, reducing the probability of large errors while allowing smaller errors to occur, thereby improving the detection probability of type-B information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional linear block coding with equal error protection is used for CQI bits, then the encoding is simple and the minimum distance is maximized, but errors in less significant bits cause large deviations in CQI values due to the absence of CRC
Solution Approach 1:
The patent applies unequal error protection where different parts of the CQI bit sequence receive different levels of protection. Specifically, more significant bits (which have greater impact on CQI accuracy) are protected with higher redundancy than less significant bits. This is achieved by designing a generator matrix where columns corresponding to more significant bits have higher weights, providing localized quality enhancement where it matters most for CQI decoding accuracy.
2Reliability
If conventional (20, 10) linear block code is used for type A information, then the minimum distance is 6, but this is not the lowest that can be found for a (20, 7) code and does not optimize error protection for CQI values
Solution Approach 1:
The patent changes the parameters of the block code from conventional equal-protection codes to unequal error protection codes. For type A information, a (20, 10) code with minimum distance 6 is designed specifically to provide higher protection to CQI bits. For type B information, a (20, 7) code with minimum distance 8 is designed, which exceeds the conventional minimum distance requirement. These parameter optimizations improve error detection probability while managing code design complexity.
Data Source
AI summary
A method and apparatus for encoding channel quality indicator (CQI) and precoding control information (PCI) bits are disclosed. Each of the input bits, such as CQI bits and/or PCI bits, has a particular significance. The input bits are encoded with a linear block coding. The input bits are provided with an unequal error protection based on the significance of each input bit. The input bits may be duplicated based on the significance of each input bit and equal protection coding may be performed. A generator matrix for the encoding may be generated by elementary operation of conventional basis sequences to provide more protection to a most significant bit (MSB).