Directional D2D Pilot Channel Resource Allocation
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Solution Overview
Problem
Existing D2D communication systems face challenges in achieving higher flexibility and interference inhibition efficiency, particularly in high-density user scenarios where D2D communication shares or reuses frequency resources with cellular communication, leading to mutual interference.
Innovation Solution
A D2D communication control method and apparatus that determines a pilot channel resource for directional pilot signals and adjusts the transmit control strategy based on the received state of these signals, optimizing directional D2D communication by allocating specific pilot channel resources and determining transmit power control strategies to minimize interference with co-frequency cellular users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication shares or reuses frequency resources with cellular communication, then frequency spectrum efficiency is improved, but mutual interference increases
Solution Approach 1:
The frequency resources are segmented into different types (first type for D2D uplink, second type for D2D downlink, third type for cellular uplink, fourth type for cellular downlink). This segmentation allows D2D and cellular communications to share the overall spectrum while avoiding direct interference through dedicated resource allocation patterns.
Solution Approach 2:
Different resource allocation strategies are applied to different communication scenarios. For example, when D2D communication quality requirements are high, the system allocates dedicated first-type resources for D2D uplink. When cellular communication quality is prioritized, fourth-type resources are allocated for cellular downlink. This local optimization resolves the interference contradiction by adapting resource allocation to specific quality requirements.
2Device complexity
If directional pilot signals are transmitted without specific resource allocation, then system complexity is reduced, but interference inhibition efficiency decreases
Solution Approach 1:
The system pre-allocates specific pilot channel resources for directional pilot signal transmission before actual D2D communication occurs. This preliminary resource allocation establishes an organized framework that enables effective interference measurement and management during subsequent communication phases without adding significant operational complexity.
Solution Approach 2:
The patent implements interference measurement based on pilot signals transmitted on allocated pilot channel resources. The received state of these pilot signals provides feedback about interference conditions, which is then used to adjust transmit control strategies. This feedback mechanism improves interference inhibition efficiency while maintaining manageable system complexity through automated adaptation.
3Speed
If transmit control strategy is determined without considering pilot signal received state, then decision speed is improved, but communication quality decreases
Solution Approach 1:
The system determines transmit control strategies based on partial information (pilot signal received state) rather than requiring complete system state knowledge. This partial action approach enables relatively quick decision-making while still achieving improved communication quality through targeted adjustments based on the measured pilot signal conditions.
Data Source
AI summary
Device to device (D2D) communication control is provided. A method comprises: determining a pilot channel resource used to send at least one directional pilot signal associated with directional D2D communication; and determining a transmit control strategy associated with the directional D2D communication at least according to a received state of the pilot signal on the determined pilot channel resource. A more appropriate D2D communication transmit control strategy can be determined according to a directional pilot signal related to directional D2D communication, thereby providing a basis for more effectively conducting the D2D communication.