Wireless Mobility Procedure Using Pre-configured Random Access Resources
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G networks, face challenges in reducing latency and overhead during high-speed vehicular mobility and inter-cell handovers, and there is a need for enhanced beam management and coverage in heterogeneous network scenarios.
Innovation Solution
The implementation of advanced mobility procedures in wireless communication systems, including the use of Special Cells (SpCells) and enhanced random access protocols, allows User Equipment (UE) to efficiently switch between cells by receiving specific signaling for random access resource allocation and beam configuration, facilitating lower latency and improved inter-cell mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional mobile voice communication networks are evolved into IP data packet communication networks, then users can access voice over IP, multimedia, multicast and on-demand communication services, but network complexity and overhead increase
Solution Approach 1:
The network is segmented into distinct functional units including access and mobility management functions, user plane functions, and radio access networks. This segmentation allows each component to be optimized independently, managing complexity while maintaining versatile service capabilities through modular architecture.
Solution Approach 2:
The network architecture implements universal functional units that can handle multiple services including voice over IP, multimedia, multicast, and on-demand communication through a common infrastructure, reducing overall network complexity while maintaining service versatility.
2Productivity
If high data throughput is provided to realize voice over IP and multimedia services, then service quality improves, but latency during handovers increases
Solution Approach 1:
The system performs preliminary actions by pre-configuring target cell information and random access resources before handover is needed. When handover occurs, the UE can immediately access the target cell using pre-configured parameters, significantly reducing handover latency while maintaining high data throughput.
Solution Approach 2:
The patent implements accelerated handover procedures that skip certain traditional steps by using pre-configured target cell information and direct random access resource allocation, allowing the UE to rapidly transition between cells without the full traditional handover sequence, thus reducing latency during high-speed mobility.
3Reliability
If random access resources are allocated for each target cell, then handover reliability improves, but signaling overhead increases
Solution Approach 1:
The source cell provides universal random access resource allocation that can be used for multiple target cells. Instead of allocating separate random access resources for each potential target cell, the system uses a unified resource allocation mechanism that serves multiple destinations, reducing signaling overhead while maintaining handover reliability.
Solution Approach 2:
The patent merges the random access resource allocation function into the source cell's signaling, combining multiple allocation instructions into a single signaling message. This consolidation reduces the quantity of signaling overhead while ensuring reliable handover by providing necessary random access resources for target cell(s).
Data Source
AI summary
A method and apparatus are disclosed. In an example from the perspective of a User Equipment (UE), the UE receives, from a first cell, a first signaling indicative of one or more random access resources of a second cell. The UE receives, from the first cell, a second signaling indicative of switching a Special Cell (SpCell) of the UE to the second cell, wherein the second signaling comprises at least one of a Physical Downlink Control Channel (PDCCH) signaling or a Medium Access Control (MAC) Control Element (CE). The UE initiates a random access procedure on the second cell in response to receiving the second signaling, wherein the random access procedure is performed by the UE using the one or more random access resources.