Dynamic Spectrum Allocation Between Cellular Networks
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Solution Overview
Problem
Traditional cellular network planning involves static allocation of frequency spectrum, limiting flexibility and leading to inefficient use of resources, especially when migrating between technologies or sharing spectrum between operators.
Innovation Solution
Implementing a method where Radio Resource Management (RRM) units from two networks share a frequency spectrum, with one network prioritizing usage based on traffic load, allowing the other network to utilize the shared spectrum during low usage periods, and adjusting allocations dynamically through information exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frequency band is statically allocated to a single radio network, then the network can operate with stable and predictable resource availability, but the spectrum utilization efficiency deteriorates when traffic load varies or when migrating between technologies
Solution Approach 1:
The patent implements dynamic frequency band allocation where the first RRM unit can occupy parts of the shared spectrum based on its traffic load requirements. The allocation is not fixed but adapts over time according to network conditions, allowing the system to transition from static to dynamic resource management while maintaining reliable operation through coordinated control between RRM units
Solution Approach 2:
The system changes the allocation parameter (frequency band occupation) dynamically based on traffic load conditions. When the first network experiences high traffic demand, it can occupy additional spectrum portions from the shared band, and when demand decreases, it releases those portions back for other uses, optimizing spectrum utilization without compromising service reliability
2Productivity
If the first RRM unit occupies more spectrum to handle high traffic load, then the bitrate and capacity of the first network improve, but the available spectrum for the second network deteriorates
Solution Approach 1:
The patent establishes a dynamic sharing mechanism where the first and second RRM units coordinate their spectrum usage. The first network can temporarily occupy additional spectrum portions when traffic demand is high, but must inform the second RRM unit, which then adjusts its own allocation accordingly. This dynamic adjustment allows both networks to achieve higher overall productivity while maintaining fair spectrum distribution
Solution Approach 2:
The system implements feedback mechanisms where the first RRM unit informs the second RRM unit about its occupation of shared spectrum portions. This feedback loop enables the second network to adjust its resource allocation in real-time, ensuring that spectrum availability is dynamically balanced between networks based on actual traffic needs rather than fixed assignments
3Object-affected harmful factors
If Guard-Band is included between carriers to reduce spurious emissions, then interference between networks is reduced, but the usable spectrum width deteriorates due to the gap between carriers
Solution Approach 1:
The patent merges the frequency bands of the first and second networks by allowing overlapping spectrum allocation. Instead of maintaining separate non-overlapping carriers with Guard-Bands, the system enables both networks to operate in the same frequency range simultaneously through coordinated resource management, eliminating the need for Guard-Bands while controlling interference through active allocation control
Solution Approach 2:
The system dynamically manages spectrum allocation to allow networks to operate in overlapping frequency regions. By continuously adjusting which portions of the spectrum are occupied by each network based on traffic conditions and coordination signals, the system can maintain interference levels below harmful thresholds while maximizing the usable spectrum width without requiring static Guard-Bands
Data Source
AI summary
The present invention relates to cellular communications and in particular to a frequency spectrum shared by two cellular networks. The object is flexible utilization of the spectrum. This is achieved by a method wherein a first of the networks occupies part of the shared spectrum in relation to the traffic load in the first network. The first network informs a second of the networks on the extent the shared spectrum is occupied, for the second network to be free to use the shared spectrum outside the occupied part. The invention also relates to a RRM unit arranged for carrying out the inventions, to a BSC and to a radio base station adapted for carrying out the method. One advantage is that spectrum can be lent from an old system when a new system is introduced.