D2D Power Control for Interference Mitigation
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Solution Overview
Problem
Device-to-device (D2D) communications in cellular networks often cause interference to both serving cellular networks and legacy co-located networks, leading to performance degradation and potential non-compliance with regulatory radio emission requirements, especially in scenarios where D2D devices are in partial or out-of-network coverage.
Innovation Solution
A method is disclosed where a network node determines the number of simultaneous D2D transmissions and compares it to threshold values, selecting a power control method to adjust the transmit power of D2D capable wireless devices, thereby mitigating interference at victim network nodes by dynamically controlling the power based on the number of simultaneous transmissions, interference rise over thermal, and dropped calls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D2D devices transmit at high power to extend coverage and improve communication reliability, then the coverage area and connection reliability are improved, but interference to serving cellular networks and legacy co-located networks increases, causing performance degradation and potential regulatory non-compliance
Solution Approach 1:
The patent implements dynamic power control where D2D transmit power is adjusted in real-time based on the number of simultaneous D2D transmissions. The network node monitors transmission count and dynamically modifies power levels to maintain reliability while reducing interference, transforming the static high-power transmission into an adaptive power management system
Solution Approach 2:
The patent changes the power parameter of D2D transmissions based on network conditions. By monitoring the number of simultaneous transmissions and comparing it to thresholds, the system modifies transmit power levels to balance coverage requirements with interference mitigation to serving and legacy networks
2Duration of action of stationary object
If D2D devices operate without network supervision in out-of-coverage scenarios to maintain communication continuity, then communication continuity is improved, but interference control capability deteriorates, leading to increased harmful emissions
Solution Approach 1:
The patent applies preliminary action by having the network node pre-configure power control parameters and thresholds for D2D devices before they enter out-of-coverage scenarios. The network node provides advance instructions on power adjustment based on transmission counts, enabling devices to maintain communication while controlling interference even without continuous network supervision
Solution Approach 2:
The patent implements feedback mechanisms where D2D devices report transmission information to the network node, which then adjusts power control parameters accordingly. This closed-loop system allows the network to maintain control over interference levels even when devices operate autonomously in out-of-coverage areas
3Object-affected harmful factors
If the network node monitors and controls each D2D transmission individually to minimize interference, then interference mitigation is improved, but system complexity and computational overhead increase
Solution Approach 1:
The patent merges individual transmission monitoring into a collective approach by counting the total number of simultaneous D2D transmissions and applying a single power control decision to all devices. This aggregation reduces the complexity from individual device management to group-based control, simplifying network node processing while maintaining interference mitigation effectiveness
Data Source
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AI summary
A method in a network node (115) is disclosed. The method comprises determining (604) a number of simultaneous device-to-device transmissions by a plurality of device-to- device capable wireless devices (110) comparing (608) the determined number of simultaneous device-to-device transmissions to one or more threshold valises, and determining (612) a power control method from among a plurality of power control methods based at least in part on the comparison of the determined number of simultaneous device-to- device transmissions by the plurality of device-to-device capable wireless devices to the one or more threshold values.