WCDMA Interference Control via Serving Cell Mediation
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Solution Overview
Problem
In WCDMA systems, interference from User Equipments (UEs) beyond the downlink coverage boundary of a cell cannot be effectively controlled, leading to network disconnection and reduced system performance, especially at the cell edge.
Innovation Solution
Acquire feature information of UEs in the non-handover region of a target cell and its co-frequency adjacent cell, determine interference UEs, and transmit control instructions to cells where these UEs are located to manage their power, thereby controlling interference and improving system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional RG DOWN command is used to control interference, then interference from UEs in E-DCH active set can be controlled, but interference from UEs beyond downlink coverage boundary cannot be controlled
Solution Approach 1:
The patent introduces a new signaling mechanism where the serving cell base station acts as an intermediary to transmit interference control commands to UEs in the non-handover region. Instead of relying on non-serving cells to directly control UEs beyond their downlink coverage, the serving cell receives interference information from non-serving cells and forwards appropriate control commands to the UEs, bridging the coverage gap.
Solution Approach 2:
The patent extends interference control from the traditional downlink coverage dimension to include the uplink coverage dimension. By identifying UEs in the non-handover region (where uplink coverage extends beyond downlink coverage) and establishing serving cell relationships, the system achieves interference control in this additional spatial dimension that was previously inaccessible.
2Productivity
If uplink coverage boundary is extended beyond downlink coverage boundary, then more UEs can be served in uplink, but these UEs cannot receive control signals from non-serving cells
Solution Approach 1:
The serving cell base station serves as an intermediary that receives interference status information from non-serving cells and translates it into appropriate control commands for UEs in the non-handover region. This intermediary mechanism allows UEs to receive necessary control signals through the serving cell rather than directly from non-serving cells beyond their coverage boundary.
Solution Approach 2:
The patent replaces the direct mechanical signaling approach (where non-serving cells directly transmit control signals to UEs) with an indirect information exchange mechanism. The serving cell base station collects interference information from non-serving cells via inter-base station signaling and then applies appropriate control, substituting the direct control path with an information-based indirect control path.
3Reliability
If interference control is extended to non-handover region, then system performance is improved, but signaling complexity increases
Solution Approach 1:
The patent applies partial action by selectively extending interference control only to UEs in the non-handover region that are identified as causing or experiencing significant interference. Rather than implementing comprehensive control for all UEs, the system focuses on specific cases where interference management is needed, reducing unnecessary signaling overhead while still improving system performance.
Solution Approach 2:
The patent changes the parameter of control signal transmission by using existing uplink power control mechanisms and adapting them for interference control purposes. Instead of creating entirely new signaling protocols, the system modifies existing power control parameters and procedures to achieve interference management, reducing signaling complexity while maintaining effectiveness.
Data Source
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AI summary
A Wideband Code Division Multiple Access (WCDMA) adjacent cell interference control method, device and a WCDMA system are described in embodiments of the disclosure. The method includes that: feature information of each User Equipment (UE) in a non-handover region (a region beyond the boundary of downlink coverage of the cell) of a cell and a co-frequency adjacent cell thereof is acquired, then interference UEs of the cell are determined according to the acquired feature information, and then control instructions are transmitted to cells where these interference UEs locate to control power of these interference UEs, thus interference caused by these interference UEs locating beyond the boundary of the downlink coverage to the cell is controlled.