Random Access Skip Configuration for Wireless Handover Optimization
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Solution Overview
Problem
Random access procedures in wireless communication networks are time-consuming, which can lead to inefficiencies and increased handover failure rates, especially in high-frequency bands with frequent handovers.
Innovation Solution
The implementation of a method and apparatus for random access skip configuration, where a handover command message includes information about random access channel configurations and downlink reference signals, allowing the selection of suitable downlink reference signals for skipping random access procedures during handovers, thereby optimizing handover efficiency and reducing handover failure rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If random access procedures are performed during handover, then connection reliability is improved, but handover time increases
Solution Approach 1:
The network configures multiple downlink reference signals and their associated random access channel resources in advance before handover. The UE measures these pre-configured reference signals and selects the best one, having the random access resources ready beforehand, thus avoiding time-consuming random access procedures during actual handover execution
Solution Approach 2:
The patent enables the UE to skip the random access procedure entirely by selecting a pre-configured random access channel resource associated with the selected downlink reference signal. This allows the UE to directly use the prepared uplink timing and resources for immediate transmission to the target cell, bypassing the traditional random access preamble transmission and waiting for random access response
2Reliability
If random access procedures are performed during handover, then uplink synchronization is achieved, but handover failure rate increases
Solution Approach 1:
The network provides pre-configured random access channel resources associated with each downlink reference signal before handover. The UE measures the reference signals, selects the best one, and immediately uses its associated pre-prepared random access resource, eliminating the need to perform time-consuming random access procedures during handover execution
Solution Approach 2:
The UE autonomously selects the best downlink reference signal from pre-configured options and independently determines which associated random access channel resource to use, without requiring network coordination or additional signaling during the handover execution phase
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for random access skip configuration. One method includes receiving a handover command message from a first cell, wherein: the handover command message includes first information that indicates a configuration of a second cell, random access channel resources on the second cell, and a first reference signals associated with the second cell; each of the first reference signals is associated with a random access channel resource; second information indicates skip configurations and second reference signals are associated with the second cell; and each of the second reference signals is associated with a random access skip configuration. The method includes receiving a first set of downlink reference signals and a second set of downlink reference signals. The method includes, selecting a first downlink reference signal and determining whether to perform a random access procedure.