Beam-Specific RACH Coverage Enhancement via Signal Repetition
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Solution Overview
Problem
Current wireless communication systems face challenges in ensuring robust random access procedures, particularly in beam-specific coverage enhancement for user equipment (UE) to connect with base stations, especially in scenarios with worse channel conditions or longer distances, where signal repetition and format modification are needed to improve success rates.
Innovation Solution
The implementation of beam-specific coverage enhancement techniques, where the scheduling entity transmits system information identifying specific beams for coverage enhancement, and repeats random access control information on these beams to improve signal reception and decoding success during the random access channel (RACH) procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beamforming is used to improve signal coverage during RACH procedure, then signal coverage is improved, but reliability is worsened in scenarios with worse channel conditions or longer distances
Solution Approach 1:
The patent applies periodic action by repeating random access control information multiple times on specific beams configured for coverage enhancement. The scheduling entity transmits the same control information repeatedly on designated beams, allowing the UE to accumulate signal energy and improve decoding reliability in challenging channel conditions or longer distance scenarios.
Solution Approach 2:
The patent implements local quality by identifying and configuring specific beams for coverage enhancement rather than applying uniform treatment to all beams. The system information identifies one or more specific beams from the beam sweep that are configured to use coverage enhancement techniques, allowing targeted improvement of reliability in directions where UEs experience worse channel conditions or longer distances.
2Reliability
If signal repetition is used to improve decoding success, then reliability is improved, but use of energy increases
Solution Approach 1:
The patent applies local quality by limiting signal repetition and coverage enhancement techniques to specific identified beams rather than all beams. The scheduling entity configures and transmits control information repeatedly only on beams that are explicitly identified as configured for coverage enhancement, thereby improving decoding success for UEs in challenging conditions while minimizing unnecessary energy consumption on beams that do not require enhancement.
Data Source
AI summary
Aspects provide various beam-specific coverage enhancement techniques for a random access channel (RACH) procedure. A scheduling entity can apply a beam-specific coverage enhancement technique to one or more random access messages associated with a random access procedure. The beam-specific coverage enhancement technique can be selectively applied on a predetermined beam or a subset of beams.