DCI-Based Uplink Precoding Mapping for Multi-TRP Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In future communication systems with multi-transmission reception point (TRP) multi-antenna panel transmission, the uncertainty in precoding information using a single piece of downlink control information (DCI) leads to the inability to perform uplink transmission effectively.
Innovation Solution
A method for determining information based on sounding reference signal resource indicator (SRI) and precoding information and number of layers (TPMI) fields in the DCI to determine data streams, transmission occasions, resource blocks, and antenna ports for uplink transmission, ensuring precise precoding and successful transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a single piece of DCI is used to schedule a terminal for uplink transmission, then the control overhead is reduced, but the precoding information becomes uncertain leading to transmission failure
Solution Approach 1:
The patent segments the precoding information determination into multiple independent paths: codebook-based precoding using TPMI fields and non-codebook-based precoding using SRI fields. Each path can be independently selected and configured, allowing the system to divide the single DCI scheduling into multiple precoding options without increasing overall control overhead.
Solution Approach 2:
The DCI structure is designed with multi-functionality by incorporating both SRI fields and TPMI fields that can serve different purposes. The same DCI can support both codebook-based and non-codebook-based precoding schemes, making it universal enough to handle multiple transmission scenarios while maintaining low overhead.
2Reliability
If multiple precoding schemes are supported in a single DCI, then transmission reliability improves, but the device complexity increases
Solution Approach 1:
The patent applies local quality by configuring different precoding schemes for different terminal capabilities and transmission scenarios. Not all terminals need to support all precoding types - the system can selectively enable codebook-based or non-codebook-based precoding based on terminal capability and network requirements, reducing processing complexity for terminals that don't need full functionality.
Solution Approach 2:
The terminal performs preliminary capability reporting to the network, indicating which precoding schemes it supports. This preliminary action allows the network to configure appropriate precoding methods in advance, avoiding the need for the terminal to process all possible precoding schemes simultaneously, thus reducing device complexity.
3Measurement precision
If SRI and TPMI fields are both used for precoding determination, then precoding accuracy improves, but the information field size increases
Solution Approach 1:
The patent implements partial action by conditionally including SRI and TPMI fields in the DCI based on the configured precoding scheme. Not all DCI messages need to contain both fields - the network can selectively include only the necessary fields for the selected precoding method, avoiding redundant information and keeping payload size minimal while maintaining precoding accuracy when needed.
Data Source
AI summary
Embodiments of the present disclosure provide an information determination method and apparatus. The method includes obtaining downlink control information sent by a network side; and determining first information and/or second information on the basis of an SRI field and/or a TPMI field in the downlink control information; and the first information includes one or more among the following: a data stream, a transmission occasion or RB set, or a PUSCH; and the second information includes one or more among the following: a PUSCH port, an SRS port, or a DMRS port. One or more among a data stream, a transmission occasion or RB set, or a PUSCH and one or more among a PUSCH port, an SRS port, or a DMRS port are determined on the basis of an SRI field and/or a TPMI field in downlink control information sent by a network side, which are used for uplink transmission precoding; uplink transmission is guaranteed.