Dynamic Handover Thresholds for Cellular Network Capacity
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Solution Overview
Problem
Current handover methods in cellular wireless networks are suboptimal as they use network-wide thresholds for adding or dropping servers, which do not account for individual user equipment's varying radio environments, leading to inefficient use of network resources and potential quality of service issues.
Innovation Solution
A method that measures signal power and evaluates the motion of user equipment to dynamically determine thresholds for adding or dropping servers, reducing the average number of servers in active sets, thereby optimizing network capacity and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If network-wide thresholds are used for adding or dropping servers, then the handover process is simple to implement, but the network capacity and resource usage efficiency deteriorate
Solution Approach 1:
The patent applies local quality by transitioning from uniform network-wide thresholds to user-specific dynamic thresholds. Each user equipment receives customized thresholds based on its individual characteristics (mobility pattern, service requirements, radio environment), thereby optimizing network capacity for each local context while maintaining overall system efficiency.
Solution Approach 2:
The patent implements dynamics by making thresholds adaptive rather than static. Thresholds are dynamically adjusted based on user equipment mobility patterns (fast-moving vs. slow-moving users), service requirements, and radio conditions, allowing the system to respond to changing conditions and maximize network capacity under varying operational states.
2Device complexity
If the same threshold is applied to all user equipment regardless of motion, then the system is easy to manage, but the quality of service for fast-moving user equipment deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying threshold values based on user equipment mobility characteristics. Fast-moving users receive lower thresholds that trigger earlier server additions and later server drops, ensuring continuous service coverage during rapid movement, while slow-moving users receive higher thresholds to optimize resource utilization.
3Reliability
If more servers are kept in active sets to improve quality of service, then service reliability increases, but data traffic loading in the backhaul network increases
Solution Approach 1:
The patent applies local quality by customizing the number of servers in active sets according to individual user equipment characteristics. Fast-moving users maintain larger active sets with more servers to ensure service continuity during rapid location changes, while slow-moving users have smaller active sets to reduce backhaul traffic loading and optimize network resources.
Data Source
AI summary
In a cellular wireless system, power thresholds used for determining whether to add or drop servers held in a set of servers, such as an active set, for serving a user equipment (UE) are determined based on the motion of the respective UE. A lower threshold may be used with respect to the adding or dropping of a given server to or from a set of servers for serving a fast moving UE than would be used for the same server with respect to adding or dropping to or from a set of servers for serving a slow moving UE, while maintaining a given quality of service. As a result, the average number of servers held in sets is reduced in a typical network that comprises a plurality of UEs moving at different speeds, compared to a situation in which the threshold is set irrespective of the motion of a UE.