Beam Association in Two-Step Random Access Procedures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless communication systems face inefficiencies in beam association and enhanced random access messaging, leading to increased latency and reduced robustness in 4G and 5G systems.
Innovation Solution
The implementation of methods and apparatuses that enable user equipment (UE) to determine mappings between synchronization signal blocks (SSBs) and random access messages, associating directional beams carrying SSBs with those carrying random access preambles and payloads, and mapping time and frequency resources to physical random access channel occasions and uplink shared channel resource units, supporting improved resource usage and reliability in two-step and four-step random access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional random access procedures are used in wireless communication systems, then the basic communication functionality is maintained, but latency increases and robustness deteriorates due to inefficiencies in beam association and resource allocation
Solution Approach 1:
The patent applies preliminary action by pre-establishing beam associations between synchronization signal blocks (SSBs) and random access messages before actual random access procedures occur. The network configures and signals beam association information to UEs in advance, enabling UEs to directly use pre-determined beams for random access message transmission, thereby reducing latency while ensuring robustness through pre-validated beam relationships.
Solution Approach 2:
The patent implements dynamics by enabling flexible and adaptive beam association configurations that can be dynamically adjusted based on channel conditions and network requirements. The beam association information is configurable and can be updated through RRC signaling, allowing the system to adapt to changing wireless conditions while maintaining low latency through efficient beam selection.
2Reliability
If beam association is enhanced through detailed mapping and association information, then reliability improves, but device complexity and signaling overhead increase
Solution Approach 1:
The patent applies universality by designing a unified beam association framework that serves multiple functions: it enables both two-step and four-step random access procedures, supports beam selection and resource allocation, and provides a foundation for future enhancements. This multi-functional approach consolidates complexity into a single versatile mechanism rather than requiring separate solutions for different scenarios.
Solution Approach 2:
The patent uses copying by representing beam associations through indexed references rather than full beam configuration details. The network signals beam association information using compact indicators that UEs use to retrieve pre-configured beam parameters, reducing signaling overhead and device complexity while maintaining complete beam association functionality for reliable random access.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may determine a mapping between synchronization signal blocks (SSBs) and a random access message of a two-step random access procedure based on an indication in system information signaling or radio resource control (RRC) signaling. The random access message may include a random access preamble and a random access payload. The UE may determine, based on the mapping, an association between one or more beams carrying the SSBs and one or more additional beams carrying the random access preamble and the random access payload of the random access message. As a result, the UE may perform the two-step random access procedure with a base station according to the beam association, and coexist with a four-step random access procedure in a more reliable and efficient manner.