Concurrent Random Access Across Multiple TRPs for Lower Latency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in reducing latency and improving the success probability of random access procedures, particularly in high-frequency bands, due to limitations in concurrent access to multiple transmission reception points or cells, and electromagnetic exposure issues affecting power control.
Innovation Solution
The implementation of multiple concurrent random access procedures with multiple transmission reception points or cells, allowing simultaneous initiation of RA procedures with different TRPs or cells, and incorporating panel-specific or TRP-specific power control and timing advance to mitigate electromagnetic exposure and enhance beam management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple concurrent random access procedures are initiated with multiple TRPs or cells, then the latency is reduced and success probability is increased, but the device complexity and power control complexity increase
Solution Approach 1:
The random access procedure is segmented into multiple independent concurrent procedures, each targeting a different TRP or cell. The UE initiates separate RA procedures with different TRPs simultaneously, dividing the overall access process into parallel segments that can be handled independently, thereby reducing total latency while managing complexity through modularization.
Solution Approach 2:
The patent introduces a spatial dimension to random access by enabling simultaneous access to multiple TRPs or cells. Instead of sequential single-TRP access, the system operates in multiple spatial dimensions concurrently, allowing the UE to establish connections with multiple transmission points at the same time, thus reducing latency through parallelism.
2Reliability
If multiple concurrent random access procedures are initiated with multiple TRPs or cells, then the success probability of random access is increased, but the electromagnetic exposure and power control complexity increase
Solution Approach 1:
The patent implements panel-specific or TRP-specific power control mechanisms that dynamically adjust transmission power parameters for each concurrent random access procedure. By changing power parameters adaptively based on panel or TRP characteristics, the system increases success probability while controlling electromagnetic exposure through optimized power levels for each concurrent access attempt.
3Reliability
If multiple concurrent random access procedures are initiated with multiple TRPs or cells, then the beam management is improved, but the timing advance control complexity increases
Solution Approach 1:
The patent applies local quality by implementing TRP-specific timing advance values for each concurrent random access procedure. Each TRP receives dedicated timing advance control tailored to its specific propagation characteristics and spatial relationship with the UE, improving beam management quality through localized optimization while managing overall complexity through structured per-TRP control.
Data Source
AI summary
Apparatuses and methods for random access procedures with multiple transmission reception points or cells in a wireless communication system. A method for performing random access (RA) procedures by a user equipment includes receiving a first configuration for RA. The method further includes initiating a first RA procedure with a first transmission-reception point (TRP) based on the first configuration and initiating a second RA procedure with a second TRP prior to completion of the first RA procedure. A method for operating a base station includes transmitting a first configuration for RA corresponding to a first TRP and transmitting a second configuration for RA corresponding to a second TRP. The first TRP and the second TRP are associated with a same cell.