Polar-Coded Control Channel Scheduling With Lower Overhead
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing control channel overhead, which hampers the performance of next-generation wireless networks like 5G, particularly in managing the reliability of bit locations for effective data transmission and error correction.
Innovation Solution
The use of polar codes to differentiate between frozen and non-frozen bits in control channel information blocks, where non-frozen bits carry high-priority scheduling information and frozen bits are set to null or used for cyclic redundancy check bits, reducing the overall size of control channel information blocks and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coding schemes are used for control channel information blocks, then all bit locations are treated equally with uniform error protection, but this results in increased control channel overhead and inefficient resource utilization
Solution Approach 1:
The patent applies local quality by differentiating error protection levels across different bit locations within the control channel information block. Specifically, frozen bits (which are known or predetermined) receive different treatment compared to non-frozen bits (which carry actual information). The system identifies reliable bit locations and allocates them to carry high-priority scheduling information, while less reliable locations are used for lower-priority data or set as frozen bits. This localized differentiation of protection quality reduces overall overhead while maintaining necessary reliability for critical information.
Solution Approach 2:
The patent segments the control channel information block into distinct categories of bit locations based on their reliability characteristics. The bit locations are divided into frozen bits and non-frozen bits, with further segmentation into high-priority and low-priority information carriers. This segmentation allows the system to apply different coding and protection strategies to different segments, optimizing the balance between reliability and overhead for each segment rather than treating the entire block uniformly.
2Loss of information
If all bit locations in control channel information blocks are used to carry scheduling information, then information capacity is maximized, but error correction capability deteriorates because no reserved bits are available for reliability checking
Solution Approach 1:
The patent applies preliminary action by pre-designating certain bit locations as frozen bits before the actual information transmission. These frozen bits are predetermined and known to both transmitter and receiver, serving as reference points for error detection and correction. By establishing these reliable reference bits in advance, the system maintains error correction capability while still utilizing the remaining non-frozen bits for information carrying, thus resolving the contradiction between information capacity and reliability.
3Adaptability or versatility
If high-priority scheduling information is allocated to unreliable bit locations, then coding flexibility is maintained, but data transmission reliability deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the mapping between information priority and bit location reliability based on channel conditions and traffic requirements. The system can change which bit locations are designated as frozen versus non-frozen, and can adjust the mapping of high-priority versus low-priority information to specific bit locations. This parametric flexibility allows the system to optimize both coding adaptability and transmission reliability by matching high-priority information to the most reliable bit locations available under current conditions.
Data Source
AI summary
Programming of frozen bits of first stage control channel information block enables scheduling information to be included for the second stage of the control channel information. By including some of the scheduling information for the second stage in the first stage frozen bits, the size of the first stage information blocks can be reduced, reducing the overhead required to transmit control information for the traffic channel. In an embodiment, the frozen bits can convey scheduling information that is lower priority than the scheduling information conveyed in the non-frozen bits of the first stage control channel information block. In another embodiment, the frozen bits can include parity bits, or cyclic redundancy check bits that are masked with the scheduling information.