PUSCH Transmission Layer and Power Control via DCI Signaling
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Solution Overview
Problem
Current wireless communication systems face challenges in improving the reliability and robustness of Physical Uplink Shared Channel (PUSCH) transmissions using multi-Transmission and Reception Point (TRP) technology, particularly in supporting spatial domain multiplexing (SDM) or frequency domain multiplexing (FDM) based PUSCH transmissions without introducing significant overhead.
Innovation Solution
The method involves receiving downlink control information (DCI) with specific fields indicating the number of layers for PUSCH transmissions, determining power based on these fields, and transmitting PUSCH based on the DCI, where the total number of layers is the sum of the indicated layers, enabling dynamic switching between single-TRP and multi-TRP transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-TRP technology is used to improve reliability and robustness of PUSCH transmissions, then communication reliability is improved, but system overhead increases
Solution Approach 1:
The DCI format is designed to support both single-TRP and multi-TRP transmissions using a unified structure. The same DCI fields (first TPMI field, second TPMI field, first SRS resource indicator field, second SRS resource indicator field) serve dual purposes: indicating transmission parameters for single TRP or combining parameters for multiple TRPs, thereby reducing the need for separate signaling mechanisms and minimizing overhead while maintaining reliability
Solution Approach 2:
The system enables dynamic switching between single-TRP and multi-TRP transmission modes based on channel conditions and reliability requirements. The terminal device can adaptively select whether to apply the first and second TPMI fields and SRS resource indicator fields individually or in combination, allowing flexible adjustment of transmission reliability without fixed overhead constraints
2Adaptability or versatility
If two TPMI fields and two SRS resource indicator fields are introduced in DCI for multi-TRP PUSCH transmission, then transmission flexibility is improved, but DCI overhead increases
Solution Approach 1:
The patent merges the indication of transmission parameters for multiple TRPs into a single DCI message by combining first and second TPMI fields and first and second SRS resource indicator fields. These fields are transmitted together in one DCI structure, allowing the terminal to interpret them as indicating parameters for a single TRP or as combined parameters for multiple TRPs, thereby achieving transmission flexibility without proportionally increasing overhead
Solution Approach 2:
The interpretation of the TPMI and SRS resource indicator fields changes based on the transmission mode. In single-TRP mode, the fields indicate parameters for one TRP; in multi-TRP mode, the same fields are interpreted as indicating combined parameters for multiple TRPs. This parameter interpretation flexibility allows the system to achieve adaptability without introducing additional signaling overhead
Data Source
AI summary
Embodiments of the present disclosure relate to a method, device and computer readable storage medium of communication. The method comprises receiving, at a terminal device and from a network device, downlink control information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH) transmission, the DCI comprising: a first field indicating a first number of layers for the PUSCH transmission; and a second field indicating a second number of layers for the PUSCH transmission; determining power for the PUSCH transmission based on the first number and the second number, and transmitting, to the network device, the PUSCH transmission based on the DCI, wherein a total number of layers for the PUSCH transmission is determined based on a sum of the first number and the second number. In this way, number of layers and power for PUSCH transmission can be determined.