Wireless Feedback Phase Compensation for Groupcast Interference
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Solution Overview
Problem
In wireless communication systems, particularly in next-generation NR systems, there is a challenge in efficiently transmitting HARQ feedback signals for groupcast and broadcast packets due to destructive interference when multiple UEs use shared resources, which affects the reliability and latency of communication.
Innovation Solution
A method where a transmission terminal transmits a reference signal to multiple reception terminals, and each terminal sends feedback signals with phase compensation based on a channel function, using a reference antenna port for phase compensation, and the transmission terminal can retransmit packets based on received NACK signals, reducing interference by channel reciprocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs transmit feedback signals using shared resources in groupcast and broadcast communications, then resource utilization is improved, but destructive interference occurs reducing signal reliability
Solution Approach 1:
The patent applies local quality by making each UE's feedback signal have a unique local characteristic through individual phase compensation. Each UE compensates its feedback signal based on its specific channel conditions (channel reciprocity), creating distinguishable signal profiles that prevent destructive interference while allowing multiple UEs to share the same time-frequency resources for HARQ feedback transmission.
2Reliability
If phase compensation is applied to feedback signals based on channel reciprocity, then destructive interference is reduced improving reliability, but additional signaling overhead is introduced
Solution Approach 1:
The patent implements self-service by enabling each UE to autonomously perform phase compensation using its own stored channel information from previous transmissions. The UE retrieves its channel characteristics (channel reciprocity) and applies phase compensation to its feedback signal without requiring real-time network intervention or additional downlink signaling, thereby improving reliability while minimizing signaling overhead.
3Measurement precision
If reference antenna port information is signaled to UEs for phase compensation, then phase alignment accuracy is improved, but signaling complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring UEs with reference antenna port information through higher-layer signaling (RRC configuration) before feedback transmission occurs. This allows UEs to have the necessary channel information stored in advance, enabling accurate phase compensation when needed without requiring complex real-time signaling or frequent updates during feedback transmission.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the reliability of packet transfer and link reliability by minimizing destructive interference and optimizing resource usage in groupcast and broadcast communications, ensuring efficient HARQ feedback even in diverse channel conditions.
Implementation Method 1
a transmission terminal transmits a reference signal to a plurality of reception terminals
Implementation Method 2
Each of the plurality of feedback signals includes a signal, to which different phase compensation applies
Implementation Method 3
reducing interference by channel reciprocity
Data Source
AI summary
A method of receiving a feedback signal by a transmission terminal in a wireless communication system includes the transmission terminal transmitting a reference signal to a plurality of reception terminals and the transmission terminal receiving a plurality of feedback signals based on the reference signal from the plurality of reception terminals. Each of the plurality of feedback signals includes a signal, to which different phase compensation applies.