Uplink Beam Indication Using SRS Groups for URLLC Reliability
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Solution Overview
Problem
In ultra-reliable and low latency communications (URLLC) scenarios, existing methods for beam indication in single and multiple uplink transmissions do not effectively enhance beam diversity, which is crucial for achieving high reliability and low latency data transmission.
Innovation Solution
The method involves transmitting SRI information to indicate K SRS resource groups, configuring spatial parameter information sets for updating spatial parameters of physical channels or signals at different transmission times, and performing PUSCH transmissions based on these groups to improve beam diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single transmission beam is indicated by SRI for PUSCH transmission, then the device complexity is reduced, but the reliability and diversity gain are insufficient for URLLC scenarios
Solution Approach 1:
The patent segments the SRS resources into multiple SRS resource groups (first SRS resource group and second SRS resource group), each associated with different spatial parameters. This allows the system to indicate multiple transmission beams through separate SRI fields in DCI, enabling beam diversity for retransmissions while maintaining manageable device complexity through structured resource organization
Solution Approach 2:
The patent dynamically selects different SRS resource groups for different transmission instances. For retransmissions, the system can dynamically switch between the first and second SRS resource groups based on channel conditions, achieving adaptive beam diversity without requiring complex manual configuration
2Reliability
If beam reuse is applied for subsequent PUSCH transmissions, then the device complexity is reduced, but the diversity gain is insufficient for URLLC reliability requirements
Solution Approach 1:
The patent divides SRS resources into distinct groups with different spatial parameters, allowing the system to indicate multiple groups through separate SRI fields. This segmentation enables the selection of diverse beams for retransmissions while keeping the indication mechanism systematic and manageable
Solution Approach 2:
The patent changes spatial parameters by associating different SRS resource groups with different spatial relations or TCI states. This allows the system to vary the transmission beam parameters for retransmissions, achieving diversity gain through parameter variation rather than complex structural changes
3Reliability
If multiple SRS resource groups are indicated with corresponding spatial parameter information, then the diversity gain and reliability are improved, but the signaling overhead increases
Solution Approach 1:
The patent makes the SRI field in DCI multi-functional by using it to indicate both the uplink channel resource and the spatial parameter information simultaneously. This universal indication mechanism reduces signaling overhead by combining multiple indication functions into a single field rather than requiring separate signaling for each parameter
Solution Approach 2:
The patent merges the indication of SRS resource groups and spatial parameter information into a unified SRI indication mechanism. By combining these indications, the system reduces the total signaling overhead while still providing the necessary information for multiple beam selection and spatial parameter configuration
Data Source
AI summary
Provided are an indication method and apparatus, and a storage medium. The indication method includes: configuring a spatial parameter information set, wherein the spatial parameter information set is used for updating at least one of a spatial parameter of a physical channel or a spatial parameter of a physical signal at different transmission times, and the spatial parameter information set comprises a transmission configuration indicator (TCI) state set or a spatial relation information.