Concurrent Random Access Across Antenna Panels for Lower Latency
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing random access latency and improving success probability, particularly in higher frequency bands, due to limitations on simultaneous PRACH transmissions and electromagnetic exposure issues, which affect beam management and PRACH power control.
Innovation Solution
The implementation of multiple concurrent random access procedures allows UEs to initiate and perform two or more RA procedures simultaneously, with panel-specific configurations and power control, enabling simultaneous PRACH transmissions and enhancing beam management, even in high-frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple concurrent random access procedures are implemented, then random access latency is reduced and success probability is improved, but electromagnetic exposure increases and beam management complexity increases
Solution Approach 1:
The patent segments the random access procedure into multiple concurrent procedures, each associated with different antenna panels. This allows the UE to perform random access transmissions simultaneously through multiple panels, reducing overall access latency while managing electromagnetic exposure through panel-specific power control and beam management.
Solution Approach 2:
The patent implements panel-specific power control that dynamically adjusts transmission power parameters for each antenna panel based on electromagnetic exposure conditions. This allows the system to maintain multiple concurrent random access procedures while controlling harmful electromagnetic exposure through adaptive parameter modification.
2Reliability
If multiple concurrent random access procedures are implemented, then random access success probability is improved, but device complexity increases
Solution Approach 1:
The patent divides beam management complexity into panel-specific segments, where each antenna panel manages its own beams independently. This segmentation allows multiple concurrent random access procedures to be handled with dedicated beam management per panel, improving success probability while distributing rather than concentrating device complexity.
Solution Approach 2:
The patent creates panel-specific configurations that can be universally applied across multiple antenna panels. Each panel has its own set of configuration parameters, power control settings, and beam management rules that can be independently optimized, allowing the system to handle multiple concurrent procedures with standardized panel-level management rather than complex centralized control.
Data Source
AI summary
Methods and apparatuses for multiple concurrent random access procedures. A method for operating a user equipment includes receiving first configuration for a random access (RA) procedure, initiating a first RA procedure on a cell based on the first configuration, and initiating a second RA procedure on the cell prior to completion of the first RA procedure. A method for a base station includes transmitting a first random access response (RAR) and a second RAR. The first RAR includes a first temporary cell radio network temporary identifier (TC-RNTI) and a first uplink grant. The second RAR includes a second TC-RNTI and a second uplink grant. The method further includes receiving a first PUSCH scheduled by the first uplink grant and a second PUSCH scheduled by the second uplink grant. The first PUSCH includes the first TC-RNTI. The second PUSCH includes only the first TC-RNTI or both the first and second TC-RNTIs.