Wireless Communication Node Spatial Parameter Determination for Multi-TRP Uplink
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Solution Overview
Problem
In wireless communication systems, particularly in MIMO transmission, determining spatial parameters for uplink transmission with multiple Transmit/Receive Points (TRPs) is challenging, especially when UE performs uplink transmission through TRPs with different timing advances, and enhancing Random Access procedures is necessary for improved performance.
Innovation Solution
A method involving the transmission of a random access preamble and monitoring a signaling in a specific time window, where spatial parameters are related to resource set indices within a resource pool, allowing for enhanced uplink synchronization and Beam Failure Recovery, while avoiding interference between TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE performs uplink transmission through two TRPs with different timing advances, then uplink transmission capability is enhanced, but determining spatial parameters for monitoring responses becomes more complex
Solution Approach 1:
The patent segments the spatial parameter determination by associating each TRP with a specific resource set index. The UE determines spatial parameters for monitoring PDCCH responses based on the resource set index of the PRACH occasion used for each TRP, thereby dividing the complex multi-TRP parameter determination into manageable TRP-specific segments.
Solution Approach 2:
The patent applies local quality by making spatial parameters TRP-specific rather than uniform across all TRPs. Each TRP's monitoring spatial parameters are locally optimized based on its associated resource set index, allowing different spatial characteristics for different TRPs while maintaining overall system coordination.
2Reliability
If spatial parameters are determined based on resource set indices, then interference between TRPs is avoided, but the requirement for resource pool configuration increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring resource pools with multiple resource sets, where each resource set is associated with a specific TRP and timing advance group. This pre-configuration enables the UE to automatically determine appropriate spatial parameters without real-time complex calculations, reducing interference between TRPs through advance resource allocation planning.
3Reliability
If Random Access procedures are enhanced for multi-TRP, then uplink synchronization is improved, but the procedure complexity increases
Solution Approach 1:
The patent enables self-service by allowing the UE to autonomously determine spatial parameters for monitoring Random Access responses based on the resource set index of the PRACH occasion it used. The UE independently selects appropriate spatial parameters without requiring explicit network signaling for each Random Access attempt, simplifying the procedure while maintaining synchronization accuracy across multiple TRPs.
Data Source
AI summary
The present application discloses a method and a device in a communication node for wireless communications. The communication node transmits a first signal, the first signal including at least a random access preamble; and monitors a first signaling in a first time window, the first signaling being used to schedule a random access response for the first signal, an end time in time domain of the first signal being used to determine a start of the first time window; the first signal is associated with a first resource set, the first resource set belonging to a first resource pool, the first resource pool including multiple resource sets; at least one spatial parameter of the first signaling is related to at least one of an index of the first resource set in the first resource pool or an index of the first resource pool.