Polar Code Block Size Determination for Control Channel Transmission
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Solution Overview
Problem
Current wireless communication systems, such as 3GPP LTE, face challenges in efficiently transmitting control information due to limitations in channel capacity and coding methods, particularly in adapting to varying payload sizes and requirements for 5G standards like NR.
Innovation Solution
The method involves determining a block size for a polar code based on a reference code rate for the control channel, encoding control information using the polar code, and transmitting the codeword through a control channel, allowing for efficient transmission of control channels with various payload sizes by utilizing polar codes in 3GPP NR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coding methods (convolutional code or turbo code) are used in LTE, then the system maintains compatibility with existing standards, but the channel capacity utilization and coding efficiency are limited
Solution Approach 1:
The patent applies polar codes with configurable block sizes and code rates to control channels. By changing the coding parameters (block size N, number of information bits K, code rate R=K/N) based on payload size and channel conditions, the system achieves better channel capacity utilization while maintaining practical implementation complexity. The polar code structure allows flexible parameter adjustment to match different control channel requirements.
2Reliability
If the block size of polar code is increased to accommodate larger payload sizes, then the coding gain improves, but the decoding complexity and processing time increase
Solution Approach 1:
The patent employs dynamic block size selection for polar codes based on the control channel payload size. The transmitter determines an appropriate block size N from a set of candidate values (e.g., N=16, 32, 64, 128, 256, 512, 1024, 2048) that matches the information bit length K and desired code rate. This dynamic adaptation allows the system to achieve optimal coding gain for each specific payload while avoiding unnecessary decoding complexity by not using excessively large block sizes when not needed.
3Adaptability or versatility
If polar codes are introduced for control channel transmission, then the coding efficiency and adaptability to varying payload sizes improve, but the implementation complexity compared to conventional codes increases
Solution Approach 1:
The patent segments the control channel transmission into multiple polar code blocks when the total payload size requires it. Instead of using a single large polar code block which would increase complexity, the system divides the information into multiple smaller polar code blocks, each with manageable size. This segmentation maintains the adaptability benefits of polar codes while keeping the implementation complexity of each coding/decoding operation practical and feasible for real-time processing.
Data Source
AI summary
Provided are a method and a device for transmitting control information by using a polar code. The device generates a codeword by encoding information bits indicating control information by using the polar code, and transmits the whole or a part of the codeword through a control channel A block size of the polar code is determined according to a reference coding rate for the control channel.