Cell Coverage Area Adjustment via Traffic-Dependent Offset Parameters
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Solution Overview
Problem
Current cellular networks face challenges in optimizing handover decisions between macro and pico cells due to the lack of consideration for uplink-downlink traffic asymmetry, leading to suboptimal offloading and increased interference.
Innovation Solution
Configuring user equipment with a set of offset parameters based on uplink-downlink traffic ratios to expand or shrink the coverage area of smaller cells, allowing for more efficient handover decisions and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed coverage area is used for small cells, then network coverage is maintained, but handover decisions cannot adapt to traffic patterns causing suboptimal offloading
Solution Approach 1:
The patent applies dynamics by making the coverage area of small cells adjustable rather than fixed. The network node dynamically configures the coverage area based on traffic patterns and handover decisions, allowing the system to adapt to changing network conditions and optimize resource allocation between macro and small cells.
Solution Approach 2:
The patent changes the parameter of coverage area size based on traffic characteristics. By modifying this physical parameter dynamically, the system can optimize handover decisions and resource allocation without adding complex new components, thus resolving the contradiction between adaptability and complexity.
2Productivity
If small cells expand coverage area to serve more users, then network capacity increases, but interference between cells increases
Solution Approach 1:
The patent applies local quality by tailoring the coverage area of each small cell to its specific location and traffic characteristics. Instead of uniform expansion, each cell's coverage is optimized locally based on its surroundings and user distribution, maximizing capacity while minimizing interference in each specific area.
Solution Approach 2:
The coverage area is dynamically adjusted based on real-time traffic patterns and interference conditions. This dynamic adaptation allows the network to expand capacity when needed while retracting coverage to reduce interference, resolving the contradiction between productivity and harmful factors.
3Productivity
If handover threshold is lowered to increase offloading, then more users are offloaded to small cells, but unnecessary handovers increase causing instability
Solution Approach 1:
The handover threshold is dynamically adjusted based on current network conditions, traffic patterns, and cell load. This dynamic threshold optimization allows the system to maximize offloading efficiency when conditions are favorable while maintaining connection stability by raising the threshold when unnecessary handovers would occur.
Solution Approach 2:
The system uses feedback from network measurements and traffic analysis to continuously optimize handover thresholds. By monitoring actual network behavior and adjusting thresholds based on this feedback, the system achieves optimal offloading while preventing unnecessary handovers that would destabilize connections.
Data Source
AI summary
Method performed by a network node of a serving cell. The method is for configuring a user equipment served by the serving cell with a set of values of an offset parameter for triggering handover towards a neighbor cell. The network node and the user equipment operate in a cellular network. The network node configures the user equipment with the set of values of the offset parameter, depending on an uplink-downlink traffic ratio of the user equipment. The user equipment receives from the network node the set of values of the offset parameter for triggering handover towards the neighbor cell. The user equipment uses the received set of values of the offset parameter to expand or shrink the coverage area of the one of the serving cell and the neighbor cell that is the smaller cell, depending on the uplink-downlink traffic ratio distribution of the user equipment.