PRACH Repetition Across Different Beams to Limit Interference
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Solution Overview
Problem
Interference in PRACH transmissions due to neighbor base stations and other wireless RF transmitters degrades wireless communication performance, particularly in congested networks with increasing mobile broadband demand.
Innovation Solution
UEs transmit PRACH transmissions using multiple beams, with each beam used during specific time periods determined by a coherence time to enhance reliability and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRACH transmissions are repeated multiple times to improve reliability, then transmission reliability is improved, but interference from neighbor base stations and other wireless RF transmitters increases
Solution Approach 1:
The patent applies periodic action by transmitting PRACH repetitions at different time instances with specific periodicity. The UE transmits multiple PRACH repetitions spaced at defined time intervals, allowing the channel to be probed periodically while managing interference exposure. This periodic transmission pattern helps in achieving reliable channel estimation while controlling the impact of intermittent interference from neighbor base stations.
Solution Approach 2:
The patent implements dynamics by adapting the PRACH repetition transmission based on channel conditions and interference levels. The gNB configures the UE with specific repetition patterns and time instances, allowing dynamic adjustment of transmission parameters. This enables the system to optimize between reliability and interference exposure by dynamically selecting transmission opportunities based on current network conditions.
2Reliability
If PRACH transmissions are repeated using the same beam to improve reliability, then beam consistency is maintained, but interference exposure increases over time
Solution Approach 1:
The patent uses periodic action by spacing PRACH repetitions at defined time instances rather than continuous transmission. This periodic pattern allows the system to maintain beam consistency for reliable channel probing while introducing time gaps that reduce cumulative exposure to interference from neighbor base stations and other RF transmitters.
Solution Approach 2:
The gNB pre-configures the UE with specific PRACH repetition patterns, time instances, and beam configurations before actual transmissions occur. This preliminary configuration allows the UE to execute reliable beam-consistent transmissions while avoiding periods of high interference, as the optimal transmission windows are determined in advance based on network conditions.
3Object-affected harmful factors
If multiple beams are used for PRACH repetitions to reduce interference, then interference diversity is improved, but device complexity increases
Solution Approach 1:
The patent applies periodic action by associating different beams with specific time instances or periodic patterns in the PRACH repetition sequence. Instead of continuously switching beams, the UE uses predetermined beam patterns at specific periodic intervals, which reduces interference through beam diversity while keeping the beam management complexity manageable through pre-defined patterns.
Solution Approach 2:
The patent implements dynamics by allowing flexible configuration of beam associations with different time instances. The gNB can dynamically adjust which beams are used at which time instances based on network conditions, enabling interference diversity while adapting the complexity level to current operational requirements. This dynamic beam-time association provides a balance between interference mitigation and implementation complexity.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support PRACH repetition suing different beams. In a first aspect, a method of wireless communication includes determining that a first PRACH transmission occasion occurs during a first time period, determining that a second PRACH transmission occasion occurs during a second time period, transmitting a first PRACH transmission at the first PRACH transmission occasion using the first beam based on the determination that the first PRACH transmission occasion occurs during the first time period, and transmitting a second PRACH transmission at the second PRACH transmission occasion using the second beam based on the determination that the second PRACH transmission occasion occurs during the second time period, wherein the second PRACH transmission is a repetition of the first PRACH transmission. Other aspects and features are also claimed and described.