Multi-TRP Random Access Using CORESET Group and TCI Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing random access procedures in multiple transmission and reception points, particularly in heterogeneous networks with varying coverage areas and traffic demands, leading to suboptimal resource allocation and increased latency.
Innovation Solution
Implementing a flexible random access procedure that adapts to network conditions and device capabilities, utilizing modular configurations and dynamic protocol stacks to optimize communication protocols in heterogeneous environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional random access procedures are used in multiple transmission and reception points, then network coverage is provided, but resource allocation efficiency is suboptimal and latency is increased
Solution Approach 1:
The patent implements dynamic random access procedures where the network can flexibly configure and switch between different random access types (contention-based and contention-free) based on real-time network conditions, device capabilities, and traffic demands. This dynamic adaptation optimizes resource allocation efficiency while reducing latency compared to static traditional procedures
Solution Approach 2:
The patent changes key parameters of the random access procedure including the use of different physical random access channel (PRACH) occasions, different preamble formats, and configurable timing advance values. These parameter changes enable optimized resource allocation and reduced latency in multi-TRP scenarios
2Adaptability or versatility
If fixed random access procedures are implemented, then protocol simplicity is maintained, but adaptability to heterogeneous network conditions is reduced
Solution Approach 1:
The patent segments the random access procedure into distinct configurable components including separate contention-based and contention-free access types, independent PRACH occasion configurations for different TRPs, and modular preamble selection mechanisms. This segmentation allows flexible adaptation to heterogeneous network conditions while keeping each component relatively simple
Solution Approach 2:
The patent creates a universal random access framework that can handle multiple scenarios (single-TRP, multi-TRP, heterogeneous networks) through a unified configurable protocol. The same basic procedure structure serves multiple functions by adjusting parameters such as TRP associations, preamble assignments, and timing configurations
Data Source
AI summary
A wireless device receives, via a first control resource set (coreset) with a first coreset group index, a physical downlink control channel (PDCCH) order initiating a random-access procedure. The wireless device transmits a random-access preamble for the random-access procedure. The wireless device receives a downlink control information (DCI), scheduling a random-access response corresponding to the random-access preamble, via a second coreset with a second coreset group index. Reception of the DCI is based on: a first transmission configuration indicator (TCI) state of the first coreset when the first coreset group index is the same as the second coreset group index, and a second TCI state of the second coreset when the first coreset group index is different from the second coreset group index.