Single-DCI Multi-TRP PUSCH Repetition Scheduling
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Solution Overview
Problem
Existing technologies face challenges in efficiently supporting multi-TRP deployment for channels other than PDSCH, particularly in enhancing single DCI based multi-TRP PUSCH repetition schemes, including how to indicate two SRS resource indicators while considering overhead and flexibility for dynamic switching between single-TRP and multi-TRP transmissions.
Innovation Solution
A method for single DCI based multi-TRP PUSCH repetition schemes, where a terminal device is configured with two SRS resource sets, allowing it to select SRS resources and determine precoders based on these sets, and a network device transmits resource configuration information via RRC, MAC CE, or DCI, reducing signaling overhead by using a single DCI to schedule multiple PUSCH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple DCI are used to schedule PUSCH transmissions for multi-TRP, then transmission reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent combines multiple DCI scheduling functions into a single DCI message that can schedule PUSCH repetitions across multiple TRPs. The single DCI includes a SRS resource indicator field that points to a configured SRS resource set, enabling the UE to determine precoding and transmission parameters for multiple TRPs without requiring separate DCI messages for each TRP, thus reducing signaling overhead while maintaining multi-TRP transmission reliability
2Measurement precision
If separate SRS resource sets are configured for each TRP, then transmission precision is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal SRS resource set configuration that serves multiple TRPs. Instead of configuring separate SRS resource sets for each TRP, a single SRS resource set is configured that can be used for precoding determination across multiple TRPs. The SRS resource indicator in the DCI dynamically selects which SRS resources from this universal set to use, reducing configuration complexity while maintaining precoding accuracy for each TRP
3Adaptability or versatility
If dynamic switching between single-TRP and multi-TRP is enabled, then adaptability is improved, but control complexity increases
Solution Approach 1:
The patent implements dynamic TRP switching through a mechanism where the SRS resource indicator field in the DCI dynamically selects SRS resources from a pre-configured SRS resource set. By changing the SRI value, the system can dynamically switch between single-TRP and multi-TRP transmissions without complex control mechanisms. The UE uses the indicated SRS resources to determine appropriate precoders for the selected TRP configuration, enabling flexible adaptation to different transmission scenarios
Data Source
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AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media of communication. A terminal device receives, from a network device, a scheduling for a set of PUSCH transmissions in DCI, determines a first subset of SRS resources in a first SRS resource set and a second subset of SRS resources in a second SRS resource set, at most one of the first subset of SRS resources and the second subset of SRS resources comprising no SRS resource, and transmit, to a network device, the set of PUSCH transmissions based on the at least one of the first subset of SRS resources and the second subset of SRS resources. In this way, single DCI based multi-TRP PUSCH repetition scheme is provided with reduced overhead and increased flexibility.