Polar Code Decoding for 5G TRP Diversity Gain
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Solution Overview
Problem
In high-frequency wireless channel environments, such as those in Frequency Range 2 (FR2) of 5G New Radio (NR), the reduced diffraction effects lead to increased signal blockage and propagation loss, resulting in lower communication reliability and range.
Innovation Solution
A method and apparatus for encoding and decoding polar codes are introduced to enhance communication reliability by increasing channel coding gain. This is achieved through the use of multiple transmission and reception points (TRPs), where the user equipment (UE) receives messages from a base station detailing TRP sets and input data mapping information, and then decodes signals from these TRPs using a polar decoder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs are used in high-frequency wireless environments, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the communication system into multiple TRPs (transmission and reception points), each handling specific parts of the communication task. The UE is divided into multiple receiving components that independently receive signals from different TRPs, and the processing is segmented into separate decoding stages (first decoding stage for each TRP, second decoding stage for combining). This segmentation allows the system to achieve higher reliability through diversity while managing complexity through modular architecture.
Solution Approach 2:
The patent implements a nested decoding structure where the first decoding stage processes signals from individual TRPs, and the second decoding stage nests within this framework to combine results from multiple TRPs. The nested structure allows the system to handle multiple TRPs systematically, with the inner decoding stages building upon the outer framework, thereby improving reliability without proportionally increasing overall system complexity.
2Reliability
If polar codes are used for channel coding, then channel coding gain is increased, but decoding complexity increases
Solution Approach 1:
The patent segments the polar code decoding process into two distinct stages: a first decoding stage that independently decodes signals from each TRP using polar codes, and a second decoding stage that combines the results from multiple TRPs. This segmentation allows the system to leverage the high channel coding gain of polar codes while managing decoding complexity through structured processing stages and parallelization across multiple TRPs.
Data Source
AI summary
A method of a user equipment (UE) may comprise: receiving, from a base station, a first message including information of TRP sets each composed of TRPs and input data mapping information; receiving, from the base station, a second message including information on a first TRP set to be used for communication among the TRP sets and information on an order of TRPs included in the first TRP set; receiving signals from the TRPs included in the first TRP set; and decoding each of the signals received from the TRPs included in the first TRP set using a polar decoder based on the input data mapping information.