D2D Communication Mode Selection via Collaborative Multiplexing
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Solution Overview
Problem
Existing device-to-device (D2D) communication technologies face inefficiencies in time-frequency resource utilization, particularly in scenarios where D2D communication links are close to uplink user equipment, leading to interference and reduced resource utilization.
Innovation Solution
A method where a base station sends control signaling to D2D user equipment and third user equipment to detect channel quality, allowing the base station to determine the optimal D2D communication mode among dedicated, common multiplexing, and collaborative multiplexing modes, thereby improving time-frequency resource utilization by selecting the collaborative multiplexing mode when the D2D communication link is close to the third user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the D2D communication link is close to the uplink user equipment, then the interference to D2D communication is strong, but if orthogonal time-frequency resources are allocated to avoid interference, then the frequency resource utilization is low
Solution Approach 1:
The patent converts the harmful interference from uplink users into a beneficial collaborative multiplexing mode. When a D2D communication link is close to an uplink user, instead of simply avoiding interference through orthogonal resources, the system enables the uplink user to act as a relay node that forwards data between D2D users. This transforms the interference problem into an opportunity for cooperative communication, improving both communication reliability and resource utilization efficiency.
Solution Approach 2:
The patent dynamically selects between different communication modes (direct mode, relay mode, collaborative multiplexing mode) based on real-time channel conditions and interference levels. The base station determines the optimal mode by evaluating channel quality indicators and adjusts resource allocation accordingly, allowing the system to adapt to changing conditions and maximize both reliability and resource utilization.
2Reliability
If the D2D communication link is far from the uplink user equipment, then the interference is weak or nonexistent, but then the spectrum resource multiplexing is not fully utilized
Solution Approach 1:
The patent merges D2D communication with cellular uplink communication by allowing them to share the same time-frequency resources through collaborative multiplexing. When channel conditions permit, the system combines D2D data transmission with uplink transmission, enabling spectrum resources to be fully utilized while maintaining communication quality through coordinated resource allocation and power control.
3Measurement precision
If channel quality detection is performed for all user equipment, then the interference can be accurately detected, but then the signaling overhead increases
Solution Approach 1:
The patent applies local quality assessment by having different user equipments perform channel quality detection only when relevant to their specific communication role. D2D users detect channel quality between themselves and their peer, while uplink users detect channel quality with the base station. This localized approach maintains measurement precision for relevant links while reducing overall signaling overhead compared to universal detection.
Data Source
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Figure 1-b
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AI summary
Embodiments of the present invention disclose a device-to-device D2D communication method and a related device. The method includes: sending, by a base station, first control signaling to first user equipment, sending second control signaling to second user equipment, and sending N pieces of third control signaling to N third user equipments; receiving first channel quality feedback signaling fed back by the first user equipment, second channel quality feedback signaling fed back by the second user equipment, and N pieces of third channel quality feedback signaling fed back by the N third user equipments; detecting channel quality between the D2D user equipment and the base station; determining a D2D communication mode based on all pieces of feedback signaling and the channel quality between the D2D user equipment and the base station; and determining in a common multiplexing mode and a collaborative multiplexing mode, target third user equipment paired with the D2D user equipment, so that time-frequency resource utilization during D2D communication can be improved.