Simultaneous Connectivity Mobility in Wireless Handover
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Solution Overview
Problem
Current wireless communication technologies face challenges in achieving near-zero millisecond latency during mobility procedures, which is crucial for services requiring ultra-reliability and low latency, such as remote control and augmented/virtual reality, due to limitations in handover and role change processes.
Innovation Solution
The implementation of techniques that manage wireless terminal mobility by using radio resource control (RRC) messages to facilitate simultaneous connectivity between source and target nodes, including the configuration of security contexts and header compression parameters, and the establishment of additional RLC entities to minimize interruption during handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used, then mobility is achieved, but latency increases and connectivity interruption occurs
Solution Approach 1:
The patent establishes RLC entities and configures data bearers in advance at both source and target nodes before handover occurs. The wireless terminal is pre-configured with multiple RLC entities that can be activated immediately upon handover command, eliminating the need to establish connections during the transition. This preliminary setup enables seamless switching with near-zero latency.
Solution Approach 2:
The patent maintains continuous data flow by establishing dual connectivity during handover. Data can be transmitted through both source and target nodes simultaneously, and the wireless terminal can switch between them without interruption. The PDCP entity continues operating without reset, ensuring continuous packet processing and preventing any gap in data transmission.
2Loss of time
If handover procedures are simplified, then latency is reduced, but connection reliability and data integrity may be compromised
Solution Approach 1:
The patent segments the data transmission path into multiple parallel RLC entities (first RLC entity and second RLC entity) that can operate independently. Each entity handles specific data streams, allowing simultaneous data transmission through multiple paths. This segmentation enables load distribution and failover capabilities, maintaining reliability while enabling rapid switching during handover.
Solution Approach 2:
The patent dynamically changes operational parameters during handover by activating different RLC entities and switching data bearer paths. The system transitions from using only source node resources to utilizing target node resources by changing the active RLC entity state. This parameter switching enables rapid adaptation to new network conditions without compromising data integrity through proper state management.
Data Source
AI summary
Techniques to achieve near zero millisecond mobility of wireless terminals are described. In one example method, a wireless terminal receives a radio resource control message from a source node. The message indicates the use of a simultaneous connectivity mobility of the wireless terminal during a mobility procedure from the source node to a target node. The wireless terminal performs the mobility procedure based on the control message.