Handover Threshold Adjustment for Relay Base Stations
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Solution Overview
Problem
In wireless communication systems, handover of user equipment (UE) to relay base stations can result in poor service due to added delays in data transmission, as data needs to traverse two air interfaces and may be routed through a relay gateway, leading to inefficiencies in network performance.
Innovation Solution
The serving base station determines whether a target base station is a relay or non-relay base station and adjusts the handover threshold parameter accordingly, setting a higher threshold for relay base stations to discourage handovers unless the signal strength is significantly stronger, thereby reducing the number of handovers to relay stations and minimizing potential delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If handover to relay base station is allowed with standard threshold, then coverage extension is achieved, but transmission delay increases due to traversing two air interfaces
Solution Approach 1:
The patent changes the handover threshold parameter based on base station type. For relay base stations, a higher (more stringent) threshold is applied compared to non-relay base stations. This parameter differentiation ensures that handover to relay stations occurs only when signal strength significantly exceeds the threshold, reducing unnecessary handovers and associated delays while still enabling coverage extension when truly needed.
2Ease of operation
If handover threshold is lowered to encourage handover, then mobility is improved, but network efficiency deteriorates due to increased handovers to relay stations
Solution Approach 1:
The patent applies different handover threshold qualities to different base station types. Non-relay base stations use a standard threshold that facilitates mobility, while relay base stations use a higher threshold that restricts handovers. This local differentiation maintains ease of operation for conventional handovers while preventing efficiency degradation from excessive relay handovers.
Solution Approach 2:
The handover threshold parameter is dynamically adjusted based on the target base station type. By setting a higher threshold for relay stations, the system selectively controls handover behavior to maintain network efficiency while preserving mobility through standard handovers to non-relay stations.
3Adaptability or versatility
If handover to relay base station occurs frequently, then coverage flexibility is enhanced, but data transmission efficiency decreases due to relay gateway routing
Solution Approach 1:
By implementing a higher handover threshold specifically for relay base stations, the patent reduces the frequency of handovers to these stations. This parameter adjustment maintains coverage flexibility by still allowing relay handovers when signal conditions strongly warrant them, while improving data transmission efficiency by minimizing unnecessary relay gateway routing.
Data Source
AI summary
A method and system to control UE handover is disclosed herein. A source base station serving a UE receives from the UE a measurement report that specifies a signal strength of a neighboring target base station. The source base station sets a value of a handover threshold parameter, with the set value being based at least in part on whether the target base station is a relay base station or a non-relay base station. Further, the source base station may compare the specified signal strength of the target base station to the set value of the handover threshold parameter and determine that a handover condition is satisfied. Responsive to making such a determination, the source base station may invoke handover of the UE from the source base station to the target base station.