PUSCH Precoding Across Multiple TRPs for Reliable Uplink
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Solution Overview
Problem
The existing mobile communication systems face challenges in accommodating explosive data traffic, increasing transmission rates, supporting a large number of connected devices, reducing latency, and enhancing energy efficiency, particularly in environments with multiple transmission reception points (TRPs).
Innovation Solution
A method and apparatus for transmitting and receiving uplink control/data channels in a wireless communication system that supports multiple TRPs by determining a rank/precoder and transmit power for each TRP, using a precoding matrix indicator (TPMI) to configure transmission occasions (TOs) and apply suitable precoding vectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single precoder is used for multiple TRPs, then device complexity is reduced, but uplink channel reliability deteriorates
Solution Approach 1:
The patent segments the precoding operation by dividing transmission occasions into multiple groups, where each group is associated with a distinct precoding vector group. This segmentation allows different precoders to be applied to different TRPs or transmission occasions, thereby improving uplink channel reliability while managing device complexity through structured organization of precoding configurations.
2Reliability
If transmit power is increased for each TRP, then uplink channel reliability is improved, but energy efficiency deteriorates
Solution Approach 1:
The patent applies parameter changes by determining distinct transmit power levels for each TRP based on their individual channel conditions and requirements. Instead of using uniform power transmission, the system adjusts power parameters dynamically for each TRP, which improves reliability for each link while optimizing overall energy efficiency by avoiding excessive power transmission to TRPs with better channel conditions.
3Reliability
If multiple precoding vector groups are used for different TO groups, then uplink channel reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments transmission occasions into multiple groups (TO groups), with each group associated with a specific precoding vector group. This segmentation strategy organizes the complexity by creating clear associations between time/frequency resources and precoding configurations, making the system more manageable while enabling reliable communication with multiple TRPs through appropriate precoding for each segment.
Solution Approach 2:
The system dynamically selects and switches between different precoding vector groups based on the current transmission occasion and TRP requirements. This dynamic adaptation allows the system to optimize reliability for each TRP while managing complexity through time-varying precoding configurations rather than requiring all possible precoders to be simultaneously active.
Data Source
AI summary
A method and apparatus for transmitting and receiving an uplink channel in a wireless communication system are disclosed. A method for transmitting a physical uplink shared channel (PUSCH) according to one embodiment of the present disclosure may comprise steps of: receiving downlink control information (DCI) for PUSCH scheduling from a base station; and transmitting the PUSCH to the base station on the basis of a transmission precoding matrix indicator (TPMI) and a transmission rank given by the DCI.