User Equipment Pre-Configured Random Access Resources
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Solution Overview
Problem
Existing random access procedures in wireless communication systems, particularly for Ultra Reliable Low Latency Communication (URLLC) and Industrial IoT (IIoT), suffer from high latency and resource inefficiency during radio link failure (RLF), necessitating improved methods to accelerate connection re-establishment.
Innovation Solution
Proactively providing UEs with dedicated or shared PUSCH occasions, PRACH occasions, and RACH preambles for two-step or legacy CFRA procedures, ensuring timely access to neighboring cells by configuring these resources in advance to reduce latency and resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional random access procedures are used for connection re-establishment after radio link failure, then the procedure can be performed with standard resources, but the latency is high and resource efficiency is poor
Solution Approach 1:
The network proactively provides dedicated random access resources (PUSCH occasions, PRACH occasions, and RACH preambles) to the UE before radio link failure occurs. These resources are pre-configured and stored in the UE, enabling immediate use upon failure detection without waiting for network response, thus reducing latency and improving re-establishment reliability
Solution Approach 2:
The random access resources are segmented into different types (PUSCH occasions for two-step CFRA, PRACH occasions for legacy CFRA, and RACH preambles) that can be selectively used based on the specific failure scenario and network configuration, allowing optimized resource utilization and reduced collision risks
2Productivity
If dedicated random access resources are pre-configured for each UE, then connection re-establishment latency is reduced, but network resource overhead increases
Solution Approach 1:
The network dynamically adjusts the allocation of dedicated random access resources based on UE requirements, service types (e.g., URLLC), and network conditions. Resources are provisioned on-demand and can be modified or revoked, allowing flexible resource management that balances productivity improvement with resource overhead control
Solution Approach 2:
The network modifies resource allocation parameters (such as the number of dedicated preambles, PUSCH/PRACH occasion frequencies and durations) based on service requirements and network load, enabling efficient resource utilization while maintaining low latency for critical services
3Device complexity
If contention-based random access is used, then resource allocation is simple, but collision risk increases and resource efficiency decreases
Solution Approach 1:
Dedicated random access resources act as an intermediary mechanism between the UE and the network, providing a reserved communication path that avoids contention with other UEs. This intermediary resource allocation eliminates collisions and improves resource efficiency while maintaining manageable complexity through standardized configuration procedures
Data Source
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AI summary
An apparatus comprising: at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to: prior to a radio link failure between a serving cell and a terminal, receive, from the serving cell, a configuration of at least one resource to perform a random access procedure with a neighbouring cell; detect a radio link failure between the serving cell and the terminal; and use the at least one resource configured prior to the radio link failure to perform the random access procedure with the neighbouring cell.