Polar Code Bit Allocation for Lower DCI Blind Detection
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Solution Overview
Problem
In wireless communication systems, the traditional LTE system's use of polar codes for Downlink Control Information (DCI) leads to an increase in blind detections at the User Equipment (UE) due to varying Bit Error Rates (BER) across different sub-channels, which complicates channel coding and decoding processes.
Innovation Solution
Implementing a method in the base station for channel coding using polar codes that pre-processes and unifies channel coding for different DCI formats, and in the UE for unified pre-decoding and decoding, reducing the number of blind detections by using bit sub-blocks with specific positions and configurations that are determined by default, thereby optimizing bit allocation and error correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different DCI formats use different channel coding schemes, then coding adaptability is improved, but device complexity and blind detection overhead increase
Solution Approach 1:
The patent applies universality by using a unified polar code-based channel coding scheme for all DCI formats. The base station performs unified channel coding on different DCI formats using the same polar code construction method, and the UE performs unified channel decoding using the same algorithm. This single coding scheme serves multiple DCI format types, eliminating the need for separate coding schemes while maintaining adaptability through format-specific parameter configurations.
Solution Approach 2:
The patent uses parameter changes to achieve coding adaptability without changing the fundamental coding scheme. Different DCI formats are encoded using polar codes with different parameters such as code rate, block length, and frozen bit positions. The base station configures different parameters for different DCI formats, allowing the same polar code structure to adapt to various formatting requirements while maintaining unified processing.
2Stability of the object's composition
If polar codes are used for all DCI formats, then coding consistency is improved, but performance on varying sub-channel capacities deteriorates
Solution Approach 1:
The patent applies local quality by mapping different DCI formats to different polar code sub-channels based on their specific requirements. The base station performs channel coding pre-processing that assigns information bits from different DCI formats to sub-channels with appropriate capacities. This ensures that each DCI format is transmitted on sub-channels with suitable error correction capabilities, optimizing reliability for each format while maintaining overall coding consistency.
Solution Approach 2:
The patent uses preliminary action through channel coding pre-processing performed by the base station before unified encoding. The base station prepares the DCI formats by determining optimal parameter configurations and bit allocations in advance, then performs unified polar code encoding. This preliminary preparation ensures that the unified coding scheme can effectively handle varying sub-channel capacities without requiring format-specific decoding procedures.
3Productivity
If unified channel coding is performed on all DCI formats, then the number of blind detections is reduced, but flexibility in handling different bit lengths is limited
Solution Approach 1:
The patent applies dynamics by making the polar code parameters dynamic rather than fixed. The base station dynamically adjusts code rate, block length, and frozen bit positions based on the specific DCI format and channel conditions. This dynamic parameter adjustment allows the unified polar code scheme to adapt to different bit lengths and formatting requirements while maintaining a single decoding process at the UE, thereby reducing blind detection overhead.
Solution Approach 2:
The patent uses segmentation by dividing the unified channel coding process into distinct stages: channel coding pre-processing at the base station, unified encoding, and unified decoding at the UE. The pre-processing stage handles format-specific adaptations while the unified encoding and decoding stages maintain consistency. This segmentation allows flexibility in handling different bit lengths within the unified framework without requiring multiple decoding paths.
Data Source
AI summary
A method and a device for channel coding in a terminal and a base station are disclosed. The base station performs channel coding and transmits a first radio signal in sequence. A first bit block is for an input to the channel coding based on a polar code. An output after the channel coding is for generating the first radio signal. The first bit block comprises bit(s) in a first and a second bit sub-block. A value of the first bit sub-block or the first bit sub-block is related to a number of bits in the second bit sub-block or in the first bit block. Position(s) of bit(s) in the first bit sub-block in the first bit block is(are) determined by default. An advantage of the present disclosure is to lift the burden on blind detections of the UE and support a more flexible information transmission format.