Dynamic Random Access Response Formatting for Wireless RRC States
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in the two-step random access procedure, particularly in formatting response messages based on the radio resource control (RRC) state and use cases, which affects the reliability and flexibility of connection establishment between user equipment (UE) and base stations.
Innovation Solution
The method involves transmitting a random access message in a two-step procedure, where the response message is formatted based on the RRC state and use case associated with the message, including parameters for successful reception, contention resolution, and resource allocation, enabling efficient and flexible random access responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a two-step random access procedure is implemented, then connection establishment speed is improved, but message formatting complexity increases due to need to adapt to different RRC states and use cases
Solution Approach 1:
The response message format is made dynamic by adapting its structure based on the UE's RRC state (idle, connected, inactive) and the specific use case. The base station dynamically selects between different message formats (e.g., including or excluding certain fields like uplink grant, timing advance command, or contention resolution identity) to match the operational context, thereby maintaining fast connection establishment while managing formatting complexity through context-aware adaptation.
2Productivity
If response messages are formatted based on RRC state and use case, then communication efficiency is improved, but processing requirements increase
Solution Approach 1:
The patent applies parameter changes by modifying the response message structure according to the UE's RRC state and use case parameters. Specifically, certain fields are conditionally included or excluded based on these parameters: for example, the uplink grant field is included only when the UE is in idle state and uplink resources are needed, while the contention resolution identity field is included only in specific use cases. This selective parameter inclusion optimizes communication efficiency by transmitting only necessary information, thereby reducing processing requirements compared to sending complete messages in all scenarios.
3Adaptability or versatility
If flexible message formatting is implemented, then adaptability to different scenarios is improved, but message format determination complexity increases
Solution Approach 1:
The patent resolves the contradiction between adaptability and complexity by using a systematic parameter-based approach. The base station determines the appropriate message format by evaluating specific parameters: the UE's current RRC state (idle, connected, or inactive) and the identified use case (e.g., initial access, handover, reconnection). Based on this parameter evaluation, the base station selects from a predefined set of message formats, each optimized for specific parameter combinations. This method provides high adaptability across different scenarios while keeping the determination process systematic and manageable through clear parameter-based rules rather than requiring complex adaptive algorithms.
Data Source
AI summary
Aspects described herein relate to transmitting, to a base station, a random access message in a two-step random access procedure, and receiving, from the base station, a response message for the random access message in the two-step random access procedure, wherein the response message is formatted based at least in part on at least one of a use case associated with the random access message and whether the random access message is successfully received.