Control Channel Incremental Redundancy for URLLC Decoding
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Solution Overview
Problem
Current wireless communications networks, particularly those supporting 5G and new radio access technologies, face challenges in efficiently transmitting control information with high reliability and low latency, especially for Ultra Reliable Low Latency Communications (URLLC) services, due to limitations in existing encoding schemes that do not effectively handle repeated transmission and chase combining.
Innovation Solution
The implementation of an incremental redundancy scheme for transmitting error correction encoded control information, which allows for the combination of encoded data units with different redundancy versions, eliminating the need for explicit signaling to identify each version and improving the integrity and reliability of control information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chase combining schemes are used for transmitting control information, then transmission reliability is improved through repeated transmission, but block error rate performance deteriorates due to ineffective handling of redundancy versions
Solution Approach 1:
The control information is divided into multiple encoded data units, each carrying a different redundancy version. The transmitter segments the encoded bits into separate transmissions, and the receiver combines them systematically to achieve better decoding performance than conventional repetition schemes.
Solution Approach 2:
The patent changes the redundancy version parameter across repeated transmissions instead of using identical copies. Each transmission uses a different redundancy version (RV0, RV1, RV2, RV3), transforming the transmission strategy from static repetition to dynamic parameter variation, which improves block error rate performance.
2Measurement precision
If explicit signaling is used to identify redundancy versions of encoded data units, then decoding accuracy is improved, but transmission overhead and complexity increase
Solution Approach 1:
The system uses self-service by deriving the redundancy version information from the physical resources themselves. The encoded data units are transmitted on different physical resources (time, frequency, or spatial domains), and the receiver automatically identifies the redundancy version based on which physical resource the data was received on, eliminating the need for separate signaling.
Solution Approach 2:
The physical resources serve multiple functions: they carry the encoded data units and simultaneously encode the redundancy version information. This multi-functionality eliminates the need for dedicated signaling resources, reducing overhead while maintaining decoding accuracy.
3Reliability
If higher aggregation levels are used to improve control information reliability, then transmission robustness is improved, but resource usage increases
Solution Approach 1:
The patent applies dynamics by using lower aggregation levels with multiple redundancy versions transmitted over time or different physical resources, rather than static high aggregation levels. This dynamic approach achieves comparable reliability through incremental redundancy combination, reducing the immediate resource consumption per transmission.
Data Source
AI summary
A communications device receive data from a wireless communications network by detecting from one or more control channels of a wireless access interface one or more encoded data units of a plurality of encoded data units into which an error correction encoded control information has been divided in accordance with an incremental redundancy scheme. The communications device decodes the error correction encoded control information by combining the one or more detected encoded data units in accordance with an arrangement of encoded bits of the error correction encoded control information in each of the plurality of encoded data units. Each of the plurality of encoded data units comprises a different set of the encoded bits according to a different redundancy version number of the incremental redundancy scheme.