PDCCH Polar Coding With Fewer Masking Sequences
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing increased communication capacity and latency, particularly in next-generation radio access technologies like new radio access technology (NR), which require improved methods for handling enhanced mobile broadband communication, massive machine-type communications, and ultrareliable low-latency communications.
Innovation Solution
The method involves determining specific information related to the aggregation level for a physical downlink control channel (PDCCH) and mother code size for polar codes, allowing for the generation of a cyclic redundancy check (CRC) block with a masking sequence, which optimizes channel coding and reduces overhead in wireless communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the aggregation level for PDCCH is increased to improve reliability, then the number of masking sequences increases, but system overhead increases
Solution Approach 1:
The patent applies universality by using a single masking sequence for multiple aggregation levels (AL1, AL2, AL4, AL8, AL16) instead of having separate masking sequences for each aggregation level. The base station transmits one masking sequence that can be used across different aggregation levels, reducing the total number of masking sequences while maintaining the ability to support multiple aggregation levels for reliable PDCCH decoding.
2Reliability
If multiple masking sequences are used for different aggregation levels, then decoding reliability improves, but processing complexity increases
Solution Approach 1:
The patent extracts the aggregation level identification function from the masking sequence itself. Instead of having different masking sequences encode both error correction and aggregation level information, the system separates these functions: the masking sequence provides error correction while the aggregation level is identified through other means (such as blind decoding or separate signaling). This reduces processing complexity by eliminating the need to manage and differentiate multiple masking sequences for different aggregation levels.
3Measurement precision
If the mother code size is not correctly determined, then decoding performance degrades, but determining it for all aggregation levels increases overhead
Solution Approach 1:
The patent applies preliminary action by having the base station determine and transmit the mother code size in advance, before the actual PDCCH decoding process. The base station notifies the user equipment of the mother code size corresponding to each aggregation level through pre-configured information or separate signaling. This allows the user equipment to quickly select the correct mother code size during decoding without needing to exhaustively determine it for all aggregation levels, reducing overhead while maintaining accurate mother code size selection.
Data Source
AI summary
A method for operating a communication device in a wireless communication system, according to the present embodiment, comprises the steps of: determining first information related to an aggregation level for a PDCCH and second information related to a mother code size for a polar code, the aggregation level being related to a first level to a fifth level, the mother code size being related to a first size to a third size, and the second information being determined according to the first information; determining whether the first information is determined to be the third level; and generating a CRC block comprising a masking sequence of a first type, when the first information is considered to be determined to be the third level.