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D2D relay time slot number selection method

A time slot and quantity technology, which is applied in the field of selection of the number of D2D relay time slots, can solve problems such as configuration problems that do not consider the optimal number of communication time slots for DRE

Active Publication Date: 2020-06-05
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] The existing data transmission algorithm based on D2D communication in NB-IoT does not consider the configuration of the optimal number of communication time slots for DRE

Method used

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  • D2D relay time slot number selection method
  • D2D relay time slot number selection method
  • D2D relay time slot number selection method

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Embodiment Construction

[0052] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0053] Aiming at the problem of uplink data transmission in narrowband Internet of Things, the present invention proposes a method for selecting the number of D2D relay time slots. In order to obtain the optimal compromise between transmission success rate and energy consumption, this paper constructs a utility function based on weighted transmission success rate and energy consumption, and based on this utility function, constructs an optimization problem of DRE communication slot configuration, On the one hand, the transmission success rate can be improved as much as possible, and on the other hand, the energy consumption can be controlled at a tolerable level as much as possible. Determine a number of reserved time slots for DRE to ensure a certain transmission success rate without waiting for other relay devices, which is beneficial t...

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Abstract

The invention relates to a D2D relay time slot number selection method, and belongs to the field of narrowband Internet of Things. The method comprises the following steps: S1, setting the number of reserved time slots of DRE as Nts, sorting candidate relays, and taking UE with the highest relay willingness as actual DRE; S2, performing calculating to obtain a work time table of the DRE; S3, establishing a transmission success rate model of the DRE; S4, establishing an energy consumption model of the DRE; S5, constructing a utility function f(Nts), and obtaining an optimization problem Maxf(Nts); S6, obtaining an Nts value for maximizing f(Nts). According to the method, the Nts value of the maximum utility function value can be found under different delta values according to different preference requirements of users, and the optimal compromise of energy consumption and transmission success rate is obtained.

Description

technical field [0001] The invention belongs to the field of narrowband internet of things, and relates to a method for selecting the number of D2D relay time slots. Background technique [0002] As an emerging LPWAN technology, NB-IoT is very suitable for IoT applications that transmit a small amount of information over a long distance. Since most user equipment (User Equipment, UE) in NB-IoT are powered by batteries and deployed on a large scale, the cost of battery replacement is high. Therefore, it is crucial to keep energy consumption to a minimum. In order to solve this problem, some researchers proposed to use D2D communication to assist the data transmission of NB-IoT system. In the D2D-assisted NB-IoT system, the energy-saving characteristics of D2D short-distance communication perfectly make up for the energy shortage caused by NB-IoT devices being driven by batteries. [0003] In D2D-assisted NB-IoT, D2D relay / receiver equipment (DRE) needs to reserve time slot...

Claims

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Application Information

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IPC IPC(8): H04W4/70H04W24/02H04W24/06H04W28/26H04W40/22
CPCH04W4/70H04W24/02H04W24/06H04W28/26H04W40/22
Inventor 裴二荣易鑫刘珊鹿逊
Owner CHONGQING UNIV OF POSTS & TELECOMM
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