Two-Step Random Access Preamble Configuration via SSB Mapping
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Solution Overview
Problem
Current wireless communication networks face challenges in efficiently configuring signaling transmissions for random access procedures, particularly in distinguishing between different types of random access procedures, which can lead to increased signaling overhead and complexity.
Innovation Solution
A method and apparatus for configuring contention-free preambles in a random access procedure, allowing for flexible mapping between synchronization signals and random access occasions, enabling separate radio resources for different signaling approaches, such as two-step and four-step RA procedures, to reduce signaling overhead while maintaining compatibility with existing procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate radio resources are configured for different random access procedures (two-step and four-step RA), then terminal devices can be distinguished during RA procedures, but signaling overhead and configuration complexity increase
Solution Approach 1:
The patent applies universality by enabling a single RO to serve multiple RA procedure types (both two-step and four-step RA) through flexible SSB-to-RO mapping configurations. The network node can configure different mapping relationships between SSBs and ROs, allowing the same RO to be shared by different RA procedures without requiring separate dedicated resources for each procedure type.
Solution Approach 2:
The patent implements dynamics through configurable SSB-to-RO mapping relationships that can be dynamically adjusted by the network node. The mapping between synchronization signals and random access occasions is not fixed but can be reconfigured based on network conditions and service requirements, enabling flexible resource allocation while maintaining clear procedure distinction.
2Reliability
If separate radio resources are configured for two-step and four-step RA procedures, then RA procedures can be distinguished, but signaling overhead increases
Solution Approach 1:
The patent applies merging by combining the resource allocation for both two-step and four-step RA procedures into shared ROs. Instead of allocating completely separate resources, the network node configures SSB-to-RO mappings that allow multiple procedure types to utilize the same physical resources, thereby reducing signaling overhead while maintaining the ability to distinguish between procedure types through configuration information.
3Productivity
If flexible SSB to RO mapping is configured, then resource utilization improves, but configuration complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the SSBs into different groups that can be mapped to different ROs based on the RA procedure type. The network node can configure specific SSB indices to associate with specific ROs, creating segmented mapping relationships that improve resource utilization while managing configuration complexity through structured organization of SSB-RO associations.
Data Source
AI summary
Various embodiments of the present disclosure provide a method for random access. The method which may be performed by a network node comprises determining configuration information for a contention free preamble in a random access occasion, based at least in part on mapping between synchronization signal and physical broadcast channel blocks and preambles for two-step random access in the random access occasion. The contention free preamble is applicable for the two-step random access. The method further comprises transmitting the configuration information to a terminal device. According to some embodiments of the present disclosure, an association between signaling transmissions in a two-step random access procedure can be configured flexibly and efficiently.