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Optimal relay selection method based on social threshold in D2D cooperative communication

A cooperative communication and threshold technology, applied in the field of D2D communication, to achieve the effect of reducing detection time, improving system throughput, and increasing effective data transmission rate

Inactive Publication Date: 2017-08-15
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, most of the existing research work is focused on the design of external incentive mechanisms, users will receive external incentives while performing collaborative communication.

Method used

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  • Optimal relay selection method based on social threshold in D2D cooperative communication
  • Optimal relay selection method based on social threshold in D2D cooperative communication
  • Optimal relay selection method based on social threshold in D2D cooperative communication

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0051] Such as figure 1 As shown, we consider the system model of the socio-physical network and the large-scale fading channel model considering only the distance. The users of this system model can be projected into two domains: the physical domain and the social domain, and each user plays two roles in these two domains: one is a physical node in a communication network, and the other is a user in a social network .

[0052] In the physical domain, we consider a pair of D2D users, including a D2D transmitter DT and a D2D receiver DR. We assume that the channel quality between D2D pairs is not good, and the D2D transmitter needs to find an idle user with better channel conditions to provide relay services. Assuming there are N potential relay users, use the set express. We assume that in a time slot, the D2D transmitter can only select one relay...

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Abstract

The invention discloses an optimal relay selection method based on a social threshold in D2D cooperative communication. The method comprises the following steps: in the detection phase of each relay node, firstly a DT sends a detection data packet to a relay user rj, the relay user rj obtains a social trust value (the formula is as shown in the specification) with the DT and an instant signal to noise ratio(the formula is as shown in the specification) with a DT-relay link; if (the formula is as shown in the specification) is greater than or equal to the threshold (the formula is as shown in the specification) of the set social trust value, the relay user rj continues to detect the relay-DR link; the received detection data packet is forwarded to the DR at transmission power in directly proportional to (the formula is as shown in the specification), the DR obtains the signal to noise ratio (the formula is as shown in the specification) and feeds back (the formula is as shown in the specification) to a D2D transmitting end DT; otherwise, the relay user rj is not will to provide relay service for the DT, and the DT detects the next relay node; and the DT calculates the data transmission rate Cj of the relay link of the relay user rj that is will to provide the relay service for the DT and selects the optimal relay node according to the optimal stopping theory. By adoption of the optimal relay selection method disclosed by the invention, the detection time of the relay link can be effectively shortened, and the effective data transmission rate and the throughput of the relay link are improved.

Description

technical field [0001] The invention belongs to the technical field of D2D communication in a 5G network, and in particular relates to an optimal relay selection method based on a social threshold in D2D cooperative communication. Background technique [0002] D2D communication will become one of the key features of the next generation cellular network. In the D2D communication system, the terminal device can directly communicate through the shared resource block without forwarding by the base station. The advantages of D2D communication are diverse, it can offload the traffic of the cellular system, reduce the battery consumption of the mobile user equipment, increase the data transmission rate, improve the robustness to infrastructure failure, and enable new services, etc. [0003] Research on traditional D2D communication often only focuses on single-hop transmission. In order to extend the communication range and obtain higher coverage probability, literature [1][2] pr...

Claims

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Application Information

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IPC IPC(8): H04W4/00H04W40/22H04B7/026
CPCH04W4/70H04W40/22H04B7/026Y02D30/70
Inventor 王霞付继凤
Owner XI AN JIAOTONG UNIV
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