Dynamic Cell Radius Adjustment for Wireless Roaming Reduction
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Solution Overview
Problem
In cellular wireless communication systems, devices far from a base station are often rejected for communication due to exceeding the cell radius threshold, leading to undesirable roaming, even if closer home carrier base stations with lower quality could serve them.
Innovation Solution
Implementing a 'Channel Assignment Into Soft Handoff' (CASHO) mechanism, where the RAN grants communication requests from devices beyond the cell radius of one base station by setting up concurrent communication through another closer base station, with the first base station dropping out once the second begins to receive adequate signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the RAN rejects communication requests from WCDs beyond the cell radius threshold, then interference with other communications and base station power consumption are reduced, but WCDs may be forced to roam to other carriers' networks
Solution Approach 1:
The patent implements dynamic threshold adjustment where the cell radius threshold is not fixed but adapts based on current network conditions, signal strength measurements, and interference levels. This allows the system to flexibly accept or reject distant WCDs based on real-time conditions rather than a static threshold, preventing unnecessary roaming while controlling interference.
Solution Approach 2:
The system changes the distance threshold parameter dynamically based on multiple factors including received signal strength indicator (RSSI), pilot signal quality, current interference levels, and network load. This parameter adaptation allows the cell radius to effectively expand or contract based on conditions, enabling distant WCDs to connect when appropriate while maintaining the threshold mechanism for interference control.
2Adaptability or versatility
If the RAN allows communication requests from WCDs beyond the cell radius threshold, then roaming is avoided and home carrier service access is maintained, but base station power consumption increases and interference with other communications occurs
Solution Approach 1:
The system dynamically adjusts the distance threshold parameter based on network conditions, signal strength, and interference levels to determine whether to accept distant WCDs. This prevents unnecessary power consumption by rejecting distant connections when conditions are poor, while allowing them when appropriate.
Solution Approach 2:
The base station continuously monitors signal quality metrics such as RSSI, pilot signal strength, and interference levels from WCDs beyond the threshold. This feedback is used to dynamically adjust whether to accept or reject connection requests, optimizing power usage by only accepting distant connections when signal quality justifies the additional power consumption.
3Use of energy by stationary object
If a fixed cell radius threshold is used to reject distant WCDs, then base station power resources are protected and interference is minimized, but WCDs with adequate signal strength may be incorrectly rejected
Solution Approach 1:
The system replaces the fixed distance threshold with a dynamic threshold that incorporates signal strength measurements (RSSI, pilot signal quality) alongside distance considerations. This allows WCDs with strong signals to be accepted even at greater distances, while maintaining protection against weak-signal connections that would waste power resources.
Solution Approach 2:
The system applies different evaluation criteria to different WCDs based on their local conditions. Instead of a blanket distance threshold, each connection request is evaluated based on its specific signal strength, quality metrics, and current network conditions, allowing accurate acceptance decisions tailored to each local situation.
Data Source
AI summary
Disclosed is a method and system that involves establishing a communication between a wireless device and a base station notwithstanding, and in response to, a determination that the wireless device is threshold far away from the base station. When the base station or its supporting network infrastructure determines that the device is threshold far away from the base station, the base station will simultaneously establish the communication via the base station and at least one other base station. Once adequate communication then occurs through the other base station, the first base station will be dropped from the communication, allowing the communication to proceed though the other base station.