LTM Random Access Resource Allocation for Handover Latency
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Solution Overview
Problem
In dense urban deployments, contention-free random access (CFRA) resources are scarce due to the need for unique configuration per user equipment (UE), leading to potential resource scarcity and increased latency in handover processes.
Innovation Solution
The implementation of a system that enables lower-layer triggered mobility (LTM) random access using a contention-free-random-access (CFRA) resource reserved specifically for each UE, preventing collisions and ensuring early timing advance acquisition during handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated CFRA resource is configured per UE to prevent collisions, then reliability of handover is improved, but resource scarcity increases in dense urban deployments
Solution Approach 1:
The patent merges the CFRA resource allocation strategy by allowing multiple UEs to share a common CFRA resource pool instead of having dedicated resources. The network dynamically allocates CFRA resources from a shared pool based on handover requirements, enabling resource reuse across different UEs and reducing overall resource scarcity while maintaining collision-free handovers through controlled access mechanisms.
2Reliability
If unique CFRA resource is configured per UE, then collision avoidance is improved, but handover latency increases due to resource allocation overhead
Solution Approach 1:
The patent implements preliminary action by pre-configuring a pool of CFRA resources and pre-establishing allocation rules before handover occurs. The network can quickly select and allocate an appropriate CFRA resource from the pre-prepared pool when handover is needed, avoiding the time-consuming process of resource discovery and configuration during the handover event itself, thus reducing handover latency while maintaining collision avoidance.
3Quantity of substance
If CFRA resource is shared among multiple UEs, then resource scarcity is reduced, but collision risk increases
Solution Approach 1:
The patent employs feedback mechanisms where the network monitors the usage status and availability of CFRA resources in real-time. Based on this feedback, the network dynamically adjusts resource allocation decisions, selecting appropriate CFRA resources from the shared pool that are currently available and suitable for the initiating UE, thereby managing collision risk while maximizing resource utilization efficiency across multiple UEs.
Data Source
AI summary
An apparatus configurable for operation as a central unit (CU), the apparatus comprising: means for enabling lower-layer triggered mobility (LTM) random access by a user equipment (UE) to a target distributed unit (DU), for early timing advance acquisition, using a contention-free-random-access (CFRA) resource, for early timing advance acquisition by the UE, reserved for the UE against use by UEs served by different DUs. An apparatus configurable for operation as a distributed unit (DU), the apparatus comprising: means for enabling lower-layer triggered mobility (LTM) random access by a user equipment (UE) to a target distributed unit (DU), for early timing advance acquisition, using a contention-free-random-access (CFRA) resource, for early timing advance acquisition by the UE, reserved for the UE against use by UEs served by different DUs.