Polar Code Redundancy Generation for Wireless Fading Channels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polar code implementations are unsuitable for facilitating efficient communications between user equipment (UEs) and network entities, particularly in channel fading conditions, and suffer from high cyclic redundancy check (CRC) overhead and suboptimal performance in wireless communication networks.
Innovation Solution
The proposed solution involves generating redundancy versions of polar codes using a Hybrid Automatic Repeat Request (HARQ) scheme, where a UE determines the incorrect decoding of a second transmission and transmits subsequent transmissions based on combinations of coded bit sets from previous transmissions, optimizing the coded bit sets for improved channel diversity and reduced CRC overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polar code implementations are used, then the communication system can operate with standard coding schemes, but the system suffers from high CRC overhead and suboptimal performance in channel fading conditions
Solution Approach 1:
The patent segments the coded bit set into multiple groups and transmits different groups in different transmissions. Instead of transmitting the entire coded bit set in one go, the system divides it into manageable segments that can be selectively transmitted and combined, reducing the need for repeated full transmissions and thereby reducing CRC overhead while maintaining reliability under fading conditions
Solution Approach 2:
The patent implements dynamic redundancy generation where the UE determines incorrect decoding and dynamically generates subsequent transmissions based on combinations of coded bit sets from previous transmissions. This adaptive approach optimizes the coded bit sets for improved channel diversity and reduces CRC overhead by only transmitting necessary redundancy information
2Adaptability or versatility
If standard HARQ schemes are used for polar codes, then retransmission can be performed, but the system lacks optimized redundancy generation for polar codes specific to fading channel conditions
Solution Approach 1:
The patent changes the parameters of the coded bit sets dynamically based on channel conditions and decoding outcomes. When incorrect decoding is detected, the system generates subsequent transmissions with modified coded bit set combinations, adapting the redundancy generation to specific fading channel conditions rather than using fixed HARQ schemes
Solution Approach 2:
The UE performs self-service by determining incorrect decoding autonomously and generating its own subsequent transmissions based on combinations of previous coded bit sets. This self-adaptive mechanism allows the system to optimize redundancy generation for polar codes without requiring external control, improving adaptability to fading conditions
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Methods and apparatuses for wireless communications are described. In an aspect, a method and apparatus may include determining that a second transmission is decoded incorrectly in response to a first received indication on a communication channel. The method and apparatus may further include transmitting, on the communication channel, a third transmission and a fourth transmission based on a determination that the second transmission is decoded incorrectly, wherein the third transmission corresponds to a coded bit set of the third transmission including a first group of information bits of a coded bit set of a first transmission and a second group of information bits of a coded bit set of the second transmission and the fourth transmission corresponds to a coded bit set of the fourth transmission including a combination of the coded bit sets of the first transmission, the second transmission, and the third transmission.