SRS Indicator DCI Interpretation for TRP Mode Switching
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Solution Overview
Problem
Current wireless communication systems lack efficient mechanisms for dynamic switching between single and multiple transmission and reception points (TRPs) in non-codebook-based communications, leading to suboptimal uplink shared channel transmissions due to insufficient threshold rank configurations and DCI interpretation rules.
Innovation Solution
The implementation of a signaling-based mechanism that allows user equipment (UE) to dynamically switch between single TRP (sTRP) and multi-TRP (mTRP) operation modes by interpreting downlink control information (DCI) fields, specifically using sounding reference signal (SRS) resource indicators to determine the maximum rank value for uplink shared channel transmissions, enabling flexible configuration of SRS resource sets and layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-codebook-based communications are used without dynamic TRP switching mechanisms, then device complexity is reduced, but adaptability and spectral efficiency deteriorate due to inability to switch between sTRP and mTRP modes
Solution Approach 1:
The patent implements dynamic switching between sTRP and mTRP operation modes through DCI-based signaling. The UE can transition between single-TRP and multi-TRP configurations based on real-time channel conditions and network requirements, with the maximum rank value dynamically adjusted via DCI fields to reflect current operational mode
Solution Approach 2:
The patent changes the maximum rank value parameter to indicate different operation modes. When maximum rank value equals the quantity of SRS resources, it indicates mTRP mode; when it is less than the quantity, it indicates sTRP mode. This parameter-based signaling mechanism enables mode switching without complex additional signaling
2Productivity
If fixed TRP operation mode is used, then device complexity is reduced, but productivity deteriorates due to inability to adapt to varying communication conditions
Solution Approach 1:
The maximum rank value field in DCI serves multiple functions: it indicates the operation mode (sTRP or mTRP), specifies the quantity of SRS resources, and controls the transmission rank. This multi-functional use of existing DCI fields enables dynamic TRP switching without adding separate signaling overhead
Solution Approach 2:
The UE autonomously determines the operation mode by interpreting the maximum rank value in the DCI message. When the maximum rank value equals the configured quantity of SRS resources, the UE autonomously switches to mTRP mode; otherwise, it switches to sTRP mode, enabling self-configured adaptive transmission
3Productivity
If dynamic TRP switching is implemented, then spectral efficiency is improved, but loss of time increases due to additional signaling processing
Solution Approach 1:
The patent uses partial interpretation of the maximum rank value field based on pre-configured SRS resource quantities. The UE only needs to compare the maximum rank value with the configured quantity to determine operation mode, rather than processing complex mode indication signals, reducing interpretation time while maintaining adaptability
Data Source
AI summary
Methods, systems, and devices for method for wireless communication are described. A UE may receive one or more control messages that indicate a quantity of sounding reference signal (SRS) resource sets, a quantity of one or more SRS resource indicator fields included in one or more control messages, and a set of parameters, and at least one maximum rank value associated with uplink shared channel transmissions and based on a threshold quantity of rank values supported by the UE. The UE receives a downlink control information (DCI) message including DCI and including the one or more SRS resource indicator fields, and interprets the one or more SRS resource indicator fields based on a quantity of the at least one maximum rank value.