Wireless Mobility Load Balancing via Conditional Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently balancing communication load among wireless communication devices, particularly with the introduction of new features in LTE and NR technologies, such as mmWave beam utilization and additional Radio Resource Control states, necessitating improved mobility load balancing procedures.
Innovation Solution
Implementing methods and apparatuses for transmitting and receiving load information requests and responses between wireless communication devices, including Xn, X2, F1, N2, and LTE Uu interfaces, to facilitate load balancing and conditional handover procedures based on load information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If load balancing procedures are implemented using existing interfaces (X2, S1), then load balancing capability is provided, but the system cannot fully utilize new NR features like mmWave beam utilization and supplemental uplink
Solution Approach 1:
The patent applies preliminary action by pre-configuring conditional handover parameters and target cell lists in advance, allowing the UE to make handover decisions autonomously when trigger conditions are met. This enables the system to prepare for future NR features while maintaining manageable complexity through standardized preparation procedures.
Solution Approach 2:
The patent implements dynamics by making handover parameters adjustable and adaptive based on real-time load information and network conditions. The system can dynamically modify handover triggers, target cell selections, and parameter configurations to accommodate emerging NR features like mmWave beams and supplemental uplink without requiring complete procedure redesign.
2Productivity
If handover parameters are adjusted frequently to balance load, then load distribution improves, but handover frequency increases causing potential instability
Solution Approach 1:
The patent applies feedback by implementing closed-loop load information exchange between gNBs and UEs. Load status is continuously monitored and fed back through measurement reports and handover confirmation messages, enabling the system to adjust handover parameters based on actual load conditions while avoiding excessive handover frequency through intelligent feedback-driven decision making.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting handover triggers, thresholds, and target cell selections based on real-time network conditions. The system can modify parameters such as handover margins, measurement reporting thresholds, and conditional handover configurations to optimize load balancing while maintaining stability through controlled parameter evolution.
3Measurement precision
If comprehensive load information is collected and processed, then load balancing accuracy improves, but processing time and system overhead increase
Solution Approach 1:
The patent applies extraction by selectively gathering only the essential load information needed for handover decisions, such as active UE counts, radio resource utilization rates, and beam usage statistics. The system extracts relevant metrics from comprehensive network data without processing all available information, thereby achieving sufficient accuracy while minimizing processing time and overhead.
Solution Approach 2:
The patent implements partial action by collecting and processing only the necessary subset of load information required for effective load balancing. The system uses partial monitoring of key performance indicators and selective handover triggering based on threshold conditions, avoiding the time-consuming processing of complete network state information while maintaining adequate load balancing performance.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may transmit a resource status request requesting load information related to load balancing between the wireless communication device and one or more other wireless communication devices. The wireless communication device may receive a resource status response including the load information in response to the request. In other aspects, a User Equipment (UE) may receive a Radio Resource Control (RRC) configuration including a set of target cells for a conditional handover procedure and load information of the target cells. The UE may select a target cell from the set of target cells for the conditional handover procedure based at least on the load information of the target cells. Numerous other aspects are provided.