Multi-Panel Codeword Transmission With CQI-Based TRP Selection
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Solution Overview
Problem
Existing mobile communication systems face challenges in managing high data traffic, low latency, and energy efficiency, particularly in 5G and pre-5G networks, due to resource limitations and user demands for high-speed services, necessitating improved transmission methods.
Innovation Solution
Implementing methods for wireless transmit/receive units to receive and transmit retransmissions of transport blocks (codewords) across different panels and/or transmit/receive points, using channel quality indication feedback to optimize panel selection and retransmission based on priority and channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple codewords are transmitted simultaneously over multiple panels and TRPs, then data transmission speed and throughput are improved, but resource management complexity and system complexity increase
Solution Approach 1:
The system segments the transmission by associating each codeword with a specific panel and TRP. This segmentation allows independent management of multiple codewords across different panels, reducing the overall complexity of managing high-speed data transmission while maintaining high throughput through parallel transmissions.
Solution Approach 2:
The system dynamically selects panels and TRPs for each codeword based on channel conditions and priority requirements. This dynamic adaptation enables the system to optimize resource allocation in real-time, achieving high data transmission speeds while managing complexity through adaptive rather than static resource assignment.
2Reliability
If retransmissions are routed to different panels than originally scheduled, then reliability and error recovery are improved, but processing complexity and decision-making complexity increase
Solution Approach 1:
The system uses feedback mechanisms where the UE measures DL reference signals from multiple TRPs and provides CQI feedback for each TRP-panel combination. This feedback enables intelligent retransmission routing decisions, improving reliability by selecting optimal panels for retransmissions while managing processing complexity through structured feedback-based decision making.
Solution Approach 2:
The system changes transmission parameters such as panel selection, TRP association, and priority levels for retransmissions. By varying these parameters based on channel conditions and codeword priority, the system achieves improved error recovery while managing processing complexity through parameter-based control rather than complex algorithmic decisions.
3Productivity
If channel quality indication feedback is provided for each TRP-panel combination, then transmission optimization is improved, but feedback overhead and signaling complexity increase
Solution Approach 1:
The system provides CQI feedback for each TRP-panel combination selectively based on configuration and actual transmission needs. This partial feedback approach enables transmission optimization for critical combinations while reducing feedback overhead by not requiring exhaustive feedback for all possible combinations, balancing optimization needs with overhead constraints.
4Loss of time
If priority-based panel selection is implemented for retransmissions, then quality of service and latency are improved, but system complexity and control complexity increase
Solution Approach 1:
The system applies different priority levels and selection criteria to different codewords and panels locally. High-priority codewords can be routed to specific panels with better channel conditions or lower latency characteristics, while lower-priority codewords use standard routing. This local quality differentiation improves overall QoS and latency performance while managing control complexity through simple priority-based rules rather than complex global optimization.
Data Source
AI summary
A method performed by a base station (BS) within a radio access network (RAN), the method comprising: receiving uplink (UL) reference signals (RSS) sent from each of a plurality of transmission/reception points (TRPs), a respective UL RSs received at each of a plurality of TRPs from each of a plurality of panels, determining a channel measuring indicator (CQI) for each of the received UL RSs, selecting a respective panel from the plurality of panels for each of the plurality of TRPs based on the determined CQI for each of the received UL RSs, and transmitting a codeword and the determined respective panel for each of the plurality of TRPs, the codeword for each of the plurality of the TRPs having a priority based on the determined CQI for each of the received UL RSs.