Beam-Specific Backoff Indicators for Random Access Congestion
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing random access procedures across different spatial beams due to varying congestion levels, leading to suboptimal resource utilization and increased latency.
Innovation Solution
The implementation of beam-specific backoff indicators, which are transmitted by base stations to user equipment, allowing them to select appropriate transmission times for random access retransmissions based on congestion levels associated with specific synchronization signal blocks, thereby optimizing resource allocation and reducing congestion-related delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single backoff indicator is used for all beams, then the system complexity is reduced, but the resource utilization efficiency deteriorates due to inability to account for varying congestion levels across different spatial directions
Solution Approach 1:
The patent segments the backoff indicator into beam-specific components, where each synchronization signal block (SSB) associated with a specific beam is assigned its own backoff indicator. This allows the system to independently manage random access parameters for each spatial direction, thereby improving resource utilization efficiency by adapting to varying congestion levels across different beams while maintaining manageable complexity through structured organization.
Solution Approach 2:
The patent applies local quality by allowing different backoff indicators to be assigned to different beams based on their specific congestion conditions. Each beam can have tailored random access parameters that reflect its local traffic characteristics, enabling optimized resource allocation in congested beams while maintaining efficient access in less congested beams, thus improving overall resource utilization.
2Productivity
If beam-specific backoff indicators are implemented, then the resource utilization efficiency is improved through tailored backoff intervals, but the device complexity increases due to transmission and processing of multiple indicators
Solution Approach 1:
The patent merges the transmission of beam-specific backoff indicators with the existing synchronization signal block (SSB) structure. Each SSB that carries synchronization information also conveys the associated backoff indicator, combining multiple functions into a single transmission unit. This approach improves resource utilization through beam-specific parameters while mitigating complexity by leveraging existing signaling infrastructure rather than creating separate dedicated channels.
Solution Approach 2:
The SSB structure is enhanced to serve multiple functions: it provides synchronization information, beam identification, and backoff indicator transmission simultaneously. This multi-functionality allows the system to implement beam-specific random access management without adding separate dedicated signaling mechanisms, thereby improving resource utilization while keeping the overall system complexity manageable through efficient use of existing structures.
3Loss of time
If beam-specific backoff indicators are used, then the latency is reduced by avoiding unnecessary retries on less congested beams, but the measurement precision requirements increase to accurately assess congestion levels per beam
Solution Approach 1:
The patent implements preliminary action by having the base station proactively determine and transmit backoff indicators for each beam before users attempt random access. The base station pre-assesses congestion levels for different beams and provides users with the appropriate backoff parameters in advance, enabling users to make informed decisions about retransmission timing without needing to perform complex real-time congestion measurements, thus reducing latency while maintaining practical measurement requirements.
Solution Approach 2:
The system implements feedback mechanisms where the base station monitors random access outcomes and congestion conditions on each beam, then adjusts and retransmits appropriate backoff indicators to users. This feedback loop enables the system to maintain accurate congestion level assessments and provide optimized backoff parameters dynamically, reducing access latency through adaptive parameter adjustment while keeping measurement requirements manageable through continuous monitoring and updating.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for selecting a base station for a user equipment to communicate with on an uplink. Certain aspects provide a method for wireless communication. The method generally includes transmitting, from a first node, one or more indicators of a plurality of different backoff indicators associated with a plurality of different synchronization signal blocks (SSBs) to a second node. The method further includes transmitting, from the first node, each of one or more of the plurality of different SSBs in a different spatial direction.