Network Node Interference Mitigation for D2D Communications
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Solution Overview
Problem
In cellular communications networks, D2D receiving user equipment is unable to adequately manage interference due to lack of information about the source of interference, leading to deteriorated signal quality and increased complexity, processing, and power consumption.
Innovation Solution
A network node assists a first user equipment by obtaining information about its receiver and determining parameters needed to mitigate interference from a second user equipment, which are then sent to the first user equipment to enable effective interference suppression or cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D2D receiving user equipment attempts to mitigate interference without assistance information, then interference suppression capability is reduced, but device complexity and processing requirements increase
Solution Approach 1:
The network node acts as an intermediary that provides assistance information about interfering transmissions to the D2D receiving user equipment. This mediator supplies critical information (resource allocations, power levels, modulation schemes) that the receiver would otherwise need to determine independently through complex analysis, thereby reducing device complexity while maintaining interference suppression capability
Solution Approach 2:
The network node performs preliminary actions by pre-calculating and providing assistance information about interfering transmissions before the D2D receiver needs to process them. This advance provision of information (resource allocations, power levels, modulation and coding schemes) allows the receiver to directly apply interference mitigation without performing complex independent analysis
2Ease of operation
If D2D receiving user equipment processes interference mitigation independently, then autonomy is maintained, but power consumption increases
Solution Approach 1:
The network node serves as an intermediary that offloads the computationally intensive task of interference characterization from the D2D receiver. By providing pre-processed assistance information about interfering transmissions, the network node enables the receiver to maintain operational autonomy while significantly reducing its power consumption for interference mitigation
Solution Approach 2:
The network node performs the energy-intensive analysis of interfering transmissions in advance and provides the results to D2D receivers. This preliminary processing by the network node allows receivers to maintain autonomy in applying interference mitigation while avoiding the high power consumption that would result from performing the same analysis independently
3Reliability
If network node provides comprehensive assistance information, then interference mitigation performance improves, but signaling overhead increases
Solution Approach 1:
The network node extracts and provides only the essential assistance information needed for interference mitigation, such as resource allocations, power levels, and modulation schemes of interfering transmissions. By selecting and transmitting only the most critical parameters rather than complete interference characterization data, the system achieves effective interference mitigation while minimizing signaling overhead
Data Source
AI summary
A method in a network node for assisting a first user equipment in interference mitigation. The network node is comprised in a cellular communications network. The cellular communications network further comprises the first user equipment and a second user equipment. The second user equipment causes interference to the first user equipment when at least one of the first user equipment and second user equipment communicate by using Device-to-Device communication. The network node obtains information about the receiver of the first user equipment. The network node then determines one or more parameters required by the first user equipment for mitigating the interference. The parameters relate to the obtained information and to the interfering second user equipment. The network node then sends the one or more parameters to the first user equipment thereby assisting the first user equipment to mitigate interference caused by the second user equipment.