WCDMA Network Capacity Optimization via Selective Emission Diversity
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Solution Overview
Problem
Third generation mobile telephony networks face challenges in optimizing capacity for downlink services, particularly in managing asymmetric data flows and minimizing the required radioelectric spectrum, as existing solutions like increasing base transceiver station power or adding frequencies are costly or limited by interference and frequency availability.
Innovation Solution
A method using a simulator to optimize network capacity by determining which base transceiver stations require emission diversity based on traffic estimates and downlink channel needs, calculating power requirements, and prioritizing resource allocation to enhance downlink services without wasting uplink capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the power of the base transceiver station is increased to increase downlink capacity, then the downlink transmission capacity is improved, but the interference increases which limits further capacity increase
Solution Approach 1:
The patent applies local quality by implementing emission diversity selectively in specific cells rather than uniformly across the entire network. The simulation tool identifies which cells benefit most from emission diversity based on local traffic patterns and coverage characteristics, allowing the system to optimize downlink capacity in high-need areas while avoiding unnecessary complexity in areas where it is not required.
Solution Approach 2:
The patent changes the parameter of transmission diversity from binary (present or absent) to a graded implementation. By using simulation to evaluate the impact of emission diversity on downlink capacity, the system can determine the optimal level of diversity implementation for each cell, effectively changing the parameter from a fixed state to an optimized variable that balances capacity improvement against interference and cost.
2Productivity
If additional frequencies (carriers) are added to increase network capacity, then the transmission capacity is improved, but the cost increases and frequency availability becomes limited
Solution Approach 1:
The patent makes the existing downlink channels multi-functional by implementing emission diversity, which allows the same frequency resources to serve both traditional unicast services and enhanced broadcast/multicast services. This universal approach enables the network to provide asymmetric downlink services without requiring dedicated additional frequencies, thereby avoiding the constraint of frequency availability.
Solution Approach 2:
The patent creates a virtual copy of the transmission channel through emission diversity, where multiple transmitted versions of the same signal are combined at the receiver. This copying mechanism effectively increases capacity without requiring physical additional frequencies, as the diversity gain is achieved through signal processing rather than spectrum expansion.
3Productivity
If emission diversity is installed in all base transceiver stations to increase downlink capacity, then the network capacity is improved, but the cost increases
Solution Approach 1:
The patent applies local quality by implementing emission diversity selectively in specific cells rather than uniformly across the entire network. The simulation tool identifies which cells benefit most from emission diversity based on local traffic patterns and coverage characteristics, allowing the system to optimize downlink capacity in high-need areas while avoiding unnecessary complexity in areas where it is not required.
Solution Approach 2:
The patent implements partial action by deploying emission diversity only in the subset of cells that require it, rather than in all cells. The simulation-based approach allows operators to identify the minimum necessary deployment scope to achieve target capacity goals, avoiding excessive investment in cells where emission diversity would provide minimal benefit.
4Productivity
If reception diversity is implemented to reduce base transceiver station power, then the network capacity is improved, but the solution depends on mobile terminals which cannot be controlled by operators
Solution Approach 1:
The patent inverts the approach from reception diversity (terminal-side) to emission diversity (network-side). Instead of relying on mobile terminals to implement diversity reception, the system implements emission diversity at the base transceiver station, giving operators full control over the diversity implementation without depending on terminal capabilities or user actions.
Data Source
AI summary
This invention relates to a method of optimising the capacity of at least one WCDMA type mobile telephony network (RT) to create at least one additional service (MBMS) for which the data flow is predominantly in the downlink direction, the method being characterized in that it includes the following steps: creation of at least one planned traffic map (CT) representing the forecast coverage of the network (RT) and the power necessary to use services, for at least one planned deployment date (DD) for the network (RT); calculation of the power available in each cell (CR) in the network (RT) in the absence of emission diversity and then a step of calculation of the power available in each cell (CR) in the network (RT) in the presence of emission diversity; creation of at least one list of cells for which emission diversity has to be installed as a function of at least a number (N) of transmission channels required for the service (MBMS) for which the flow is predominantly in the downlink direction.