Wide Area RRC Configuration for Wireless Device Handover
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Solution Overview
Problem
Current RRC configuration procedures for wireless devices involve large messages and significant overhead during handovers, leading to delays and inefficiencies, especially in high-frequency networks and satellite communications where cell changes are frequent, and existing solutions like delta signaling are complex and seldom used.
Innovation Solution
Implementing a wide area configuration method where a central network node sends a list of RRC configurations for all cells in a predefined area to the wireless device, allowing it to execute handovers, resumes, or setups with reduced signaling by using preconfigured information, thereby minimizing message exchange and resource reservations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional RRC configuration procedures are used for handovers, then complete configuration information is transmitted to ensure proper setup, but large messages and significant overhead cause delays and inefficiencies
Solution Approach 1:
The patent applies preliminary action by pre-configuring RRC parameters at the network side before handover occurs. The source gNB prepares and stores RRC reconfiguration parameters in advance, so that when handover is needed, the wireless device can directly use these pre-prepared parameters without waiting for real-time configuration transmission, thereby reducing handover delay while maintaining configuration completeness
Solution Approach 2:
The patent uses copying by having the wireless device store copies of RRC reconfiguration parameters received from the network during initial setup or previous handovers. When handover occurs, the device reuses these stored parameter copies instead of receiving complete new configurations, significantly reducing signaling overhead and handover time while preserving necessary configuration information
2Quantity of substance
If delta signaling is used to reduce message size, then signaling overhead is reduced, but the solution becomes complex and is seldom used in practice
Solution Approach 1:
The patent applies self-service by enabling the wireless device to autonomously determine which RRC parameters need to be retransmitted or updated during handover based on changes in target cell characteristics. The device independently identifies necessary parameter updates without requiring complex network coordination, simplifying the overall mechanism while reducing signaling overhead through selective parameter transmission only when changes occur
3Reliability
If multiple target candidate cells are prepared to increase robustness, then handover reliability improves, but resource reservation complexity and network load increase
Solution Approach 1:
The patent applies dynamics by making the set of target candidate cells dynamic rather than static. The network can flexibly adjust which cells are prepared for handover based on real-time conditions such as network load, signal quality, and device location. This dynamic approach allows the system to maintain high handover robustness by having multiple candidate cells available when needed while avoiding unnecessary resource reservation complexity during low-demand periods
Data Source
AI summary
A method, core network node, cell node, and wireless device (WD) for radio resource control (RRC) wide area configuration of a WD are disclosed. According to one aspect, a method in a central network node includes configuring a set of cells to be included in a wide area configuration for a WD. The method also includes sending a wide area cell configuration signal to the WD, the wide area cell configuration signal including configurations for each cell in a predefined wide area, the predefined wide area being a collection of cells, the configurations including setup, resume and hand over configurations and resource allocations for an active wide area including a subset of cells of the collection of cells of the predefined wide area.