Base Station Coverage Expansion for Traffic Load Balancing
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Solution Overview
Problem
Cellular wireless networks face operational limitations due to bandwidth, frequency allocation, and base station placement issues, leading to delayed call setups and blocked calls as coverage areas often reach capacity or remain underutilized, necessitating effective load balancing between coverage areas.
Innovation Solution
The method involves a first base station expanding its coverage area on a specific carrier frequency and signaling neighboring base stations to direct user equipment (UEs) to prioritize operating on that frequency, facilitating handoffs and ensuring utilization of available traffic channel resources by adjusting antenna tilt and broadcasting prioritization lists to UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a coverage area is expanded to serve more UEs, then the capacity and coverage distance are improved, but the traffic channel resources become overwhelmed and call setup delays increase
Solution Approach 1:
The patent implements dynamic adjustment of coverage area parameters including distance of coverage, antenna tilt, and azimuthal direction. Base stations can modify their radiation patterns in real-time based on traffic conditions, allowing the network to adapt coverage boundaries dynamically rather than maintaining fixed cell geometries.
Solution Approach 2:
The system changes physical parameters of base station operation including carrier frequency selection, pilot power levels, and antenna configuration. By adjusting these parameters, the network can shift UEs between different coverage areas and frequency channels to balance traffic loads.
2Device complexity
If base stations use fixed antenna tilt and frequency allocation, then device complexity is reduced, but load balancing between coverage areas cannot be achieved
Solution Approach 1:
The patent implements dynamic adjustment of coverage area parameters including distance of coverage, antenna tilt, and azimuthal direction. Base stations can modify their radiation patterns in real-time based on traffic conditions, allowing the network to adapt coverage boundaries dynamically rather than maintaining fixed cell geometries.
Solution Approach 2:
The system employs feedback mechanisms where base stations monitor traffic channel utilization and UE distribution, then adjust their parameters accordingly. This closed-loop control enables automatic load balancing without manual intervention, with base stations responding to network conditions by modifying their coverage characteristics.
3Productivity
If coverage areas are adjusted to balance traffic loads, then resource utilization improves, but handoff procedures between coverage areas become more complex
Solution Approach 1:
The patent prepares for handoffs by pre-configuring adjacent base stations with information about expanded coverage areas and adjusting their parameters in advance. This preliminary action ensures that target coverage areas are ready to receive UEs before handoff occurs, reducing handoff complexity and improving success rates.
4Device complexity
If base stations operate on multiple carrier frequencies with fixed allocation, then frequency resource management is simplified, but UEs cannot be directed to prioritize specific frequencies for load balancing
Solution Approach 1:
The system changes physical parameters of base station operation including carrier frequency selection, pilot power levels, and antenna configuration. By adjusting these parameters, the network can shift UEs between different coverage areas and frequency channels to balance traffic loads.
Solution Approach 2:
The system employs feedback mechanisms where base stations monitor traffic channel utilization and UE distribution, then adjust their parameters accordingly. This closed-loop control enables automatic load balancing without manual intervention, with base stations responding to network conditions by modifying their coverage characteristics.
Data Source
AI summary
Disclosed is a method and system for managing coverage area changes using base station signaling. The method may involve a first base station increasing the distance of coverage of the first base station on a first carrier frequency such that the extended coverage extends to a coverage area of a second base station on the first carrier frequency. The second base station may also be providing the coverage area on a second carrier frequency. The method may also involve causing one or more UEs being served by the second base station on the second frequency to prioritize operating on the first carrier frequency of the second base station over operating on the second carrier frequency of the second base station.