Random Access Occasion Mapping for Beam Load Balancing
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively distributing random access occasions (ROs) to synchronization signal blocks (SSBs) due to varying traffic loads, channel conditions, and UE capabilities, leading to imbalanced load and inefficient use of ROs across different transmission beams.
Innovation Solution
Dynamic mapping of ROs to transmission beams based on explicit indications, considering traffic load, channel conditions, and UE capabilities, allowing for dynamic load balancing, coverage enhancements, and reduced latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If static mapping of random access occasions to SSBs is used, then configuration simplicity is maintained, but load balancing performance deteriorates under varying traffic conditions
Solution Approach 1:
The patent implements dynamic mapping of random access occasions to SSBs by introducing a mapping indication field that can be updated based on current traffic load, channel conditions, and UE capabilities. This allows the system to transition from static to dynamic configuration, enabling real-time adaptation to varying conditions while maintaining manageable complexity through standardized signaling procedures.
Solution Approach 2:
The patent changes the mapping parameters between ROs and SSBs dynamically by updating the mapping indication field in system information or RRC signaling. This allows the network to adjust the association relationships based on current system conditions, thereby improving load balancing performance without requiring complete reconfiguration of the random access procedure.
2Productivity
If dynamic mapping of ROs to SSBs is implemented, then load balancing performance is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial dynamic mapping by implementing dynamic RO-SSB mapping only when needed based on traffic conditions, rather than always using dynamic mapping. The network can selectively update mapping indications or maintain static mapping during low-traffic periods, thereby reducing signaling overhead while still achieving load balancing performance improvements when conditions require it.
Solution Approach 2:
The patent implements periodic updates of mapping indications rather than continuous signaling. The network can update the RO-SSB mapping relationships at predetermined intervals or triggered by specific events, reducing signaling overhead compared to continuous dynamic adaptation while still maintaining effective load balancing through periodic reconfiguration.
3Device complexity
If uniform distribution of ROs across SSBs is used, then configuration simplicity is maintained, but adaptability to channel conditions deteriorates
Solution Approach 1:
The patent applies local quality by allowing different RO-SSB mapping configurations for different SSBs based on their specific channel conditions. Instead of uniform distribution, the network can assign specific ROs to specific SSBs based on measured channel quality, traffic patterns, and UE capabilities, thereby improving adaptability while maintaining manageable configuration complexity through localized adjustments.
Solution Approach 2:
The patent enables parameter changes in the RO-SSB mapping relationships to adapt to varying channel conditions. By updating mapping indications based on channel measurements and system state, the network can optimize the association between ROs and SSBs for current conditions while maintaining a standardized configuration framework that limits complexity.
4Device complexity
If fixed RO-SSB association is used, then system complexity is reduced, but latency in responding to traffic variations increases
Solution Approach 1:
The patent introduces dynamic RO-SSB mapping with updated association relationships that can respond to traffic variations. By implementing dynamic mapping indications that can be updated in system information or RRC signaling, the system reduces latency in adapting to changing conditions while maintaining manageable complexity through standardized update procedures and event-triggered mechanisms.
Solution Approach 2:
The patent applies preliminary action by pre-configuring multiple mapping patterns or indication values that can be quickly switched based on traffic conditions. Instead of calculating new mappings in real-time, the system prepares multiple predefined mapping configurations and selects the appropriate one based on current conditions, thereby reducing latency while maintaining system complexity at acceptable levels.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for dynamic mapping of random access occasions to transmission beams. An example method for wireless communications by an apparatus includes obtaining a first configuration for random access communications, wherein the first configuration includes a first explicit indication of a first mapping of a first subset of random access occasions of a plurality of random access occasions to a first synchronization signal block (SSB); and sending first signaling in at least one random access occasion of the first subset of random access occasions associated with the first SSB.