Random Access Buffer Status Reporting Under RA Timer Constraints
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Solution Overview
Problem
The existing random access procedures in wireless communication networks, particularly in non-terrestrial networks (NTNs), face inefficiencies due to high latency and resource utilization challenges, especially in scenarios involving large propagation delays and varying traffic conditions.
Innovation Solution
A 2-step random access (RA) procedure is introduced, incorporating a buffer status report (BSR) mechanism to optimize resource allocation and reduce latency by providing timely feedback on data availability, thereby enhancing network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional random access procedures are used in non-terrestrial networks, then network coverage can be maintained, but access efficiency and connection reliability deteriorate due to high mobility and varying traffic conditions
Solution Approach 1:
The patent implements dynamic random access procedures that adapt to varying traffic conditions and mobility patterns in non-terrestrial networks. The system adjusts random access parameters such as preamble transmission timing, power levels, and resource allocation based on real-time channel conditions and UE mobility states, thereby maintaining connection reliability while improving access efficiency
Solution Approach 2:
The patent modifies key random access parameters including preamble format, transmission power, and timing advance values to optimize performance for different mobility scenarios. By dynamically changing these parameters based on network conditions and UE behavior, the system resolves the contradiction between maintaining reliable connections and achieving efficient access in satellite-based networks
2Reliability
If advanced beam management techniques are implemented, then UE connectivity and network performance improve, but system complexity increases
Solution Approach 1:
The patent divides beam management into distinct phases and functions: beam discovery, beam selection, beam refinement, and beam maintenance. Each phase uses simplified procedures tailored to its specific objective, reducing overall system complexity while achieving reliable UE connectivity through structured, modular beam management approaches
Solution Approach 2:
The patent introduces reference signals such as CSI-RS and SRS as intermediary elements that facilitate beam management between the gNB and UE. These reference signals carry channel state information and beam quality metrics, enabling automated beam selection and optimization without requiring complex direct negotiation protocols, thus improving connectivity while managing system complexity
3Productivity
If buffer status reporting is performed frequently to improve scheduling accuracy, then resource allocation efficiency improves, but signaling overhead and processing load increase
Solution Approach 1:
The patent implements selective buffer status reporting where UEs report buffer status information only when necessary - such as when data arrives in the buffer, when channel conditions change significantly, or when scheduled for uplink transmission. This partial reporting approach maintains adequate resource allocation efficiency while substantially reducing signaling overhead compared to frequent periodic reporting
Solution Approach 2:
The patent enables the network to infer buffer status information from uplink scheduling requests and transmission patterns, reducing the need for explicit BSR messages. The gNB can estimate buffer conditions based on UE behavior and historical data, thereby maintaining resource allocation efficiency while minimizing additional signaling overhead
Data Source
AI summary
A wireless device receives one or more configuration parameters indicating a first timer used for prohibiting initiation of a random access (RA) procedure for a buffer status report (BSR). The wireless device starts the first timer based on completing a first RA procedure initiated for a first BSR and triggers a second BSR while the first timer is running. Based on the triggering the second BSR while the first timer running, the wireless device prohibits initiation of a second RA procedure for the second BSR.