CSI Feedback Using Two PRB Pairs for Uplink Reliability
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring reliable and robust channel state information (CSI) feedback, particularly in scenarios with poor uplink channel quality and distributed coordinated multipoint environments, leading to inadequate downlink data transmission reliability.
Innovation Solution
Enhance CSI feedback reliability by allocating more physical resources and using a robust low bit-rate modulation and coding scheme, such as Reed-Muller coding and QPSK modulation, to improve CSI transmission coverage and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more physical resources are allocated for CSI feedback, then CSI transmission coverage and reliability are improved, but system resource overhead increases
Solution Approach 1:
The patent applies partial action by allocating enhanced physical resources (such as additional reference signals or dedicated feedback resources) only for CSI feedback transmission in specific scenarios where uplink channel quality is poor or coverage enhancement is needed, rather than always using maximum resources. This allows the system to improve CSI reliability when necessary while avoiding unnecessary resource overhead in good channel conditions.
2Reliability
If robust low bit-rate modulation and coding scheme is used for CSI feedback, then transmission robustness is improved, but transmission rate decreases
Solution Approach 1:
The patent dynamically adjusts modulation and coding parameters for CSI feedback based on channel conditions. In poor uplink channel quality scenarios, it switches to robust low bit-rate modulation schemes (such as QPSK with strong forward error correction) to ensure reliable CSI transmission. When channel conditions improve, the system transitions to higher order modulation schemes to increase feedback rate, thus balancing reliability and productivity through parameter adaptation.
Data Source
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AI summary
This application relates to the mobile communications field, and in particular, to a CSI (Channel State Information, channel state information) feedback technology in a wireless communications system. In a CSI feedback method, a network device allocates, for a feedback of one piece of CSI of user equipment, a physical uplink control channel resource including two PRB (Physical Resource Block, physical resource block) pairs, and the user equipment uses a low bit-rate modulation and coding scheme for a CSI bit, and sends CSI on the physical uplink control channel resource. The solution provided in this application can improve CSI feedback reliability and coverage and ensure downlink data transmission reliability.