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User movement-based relay selection method in D2D communication under overlay working mode

A technology of user movement and working mode, which is applied in wireless communication, network traffic/resource management, electrical components, etc., and can solve problems such as packet loss, frequent initialization, and complex measurement

Inactive Publication Date: 2016-06-01
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The user is in a state of motion, and the relay may leave the D2D relay cooperation area during the communication process, which requires relay switching. If the relay selection is unreasonable and frequent switching between relays, this will bring complicated measurement and frequent initialization. , delay, packet loss, disconnection and other phenomena that reduce system performance, how to select reasonable cellular users as relays based on user movement is an important research topic

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  • User movement-based relay selection method in D2D communication under overlay working mode
  • User movement-based relay selection method in D2D communication under overlay working mode
  • User movement-based relay selection method in D2D communication under overlay working mode

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Embodiment Construction

[0074] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation.

[0075] Communication scenarios of the present invention such as figure 1 As shown, the basic model is as figure 2 As shown, the specific steps are as follows:

[0076] Step 1: Create a figure 1 In the relay-based D2D communication network under the shown MIMO cellular network, each cellular user is equipped with a single omnidirectional antenna.

[0077] Step 2: Count the number of cellular users CRx that can be selected as relays in the relay cooperation area, as well as their positions and moving directions.

[0078] Step 3: According to the data provided in step 2, with the goal of maximizing the relay duration and minimizing the relay switching rate, select the best relay according to the RSS (Relay Selection Schemes) selection mechanism proposed by the present invention.

[0079] In the first step, the user has only one antenna, ...

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Abstract

The invention discloses a user movement-based relay selection method in D2D communication under an overlay working mode. Problems caused by a situation that a user is under a moving state scene are prominent problems which need to be solved urgently in relay selection and encountered by D2D communication in a cell of origin in practical engineering application. The user movement-based relay selection method in D2D communication under an overlay working mode provided by the invention includes the following steps that: a relay-based D2D communication network under a MIMO cellular network is established, the signal coverage overlapping rang of a D2D transmitting end and a D2D receiving end is a relay cooperative region; the number of cellular users which can be selected as relays in the relay cooperative region, the positions and moving directions of the cellular users are put into statistics; and an optimal relay is selected out according to the data provided previously with maximizing relay continuous time and minimizing relay switching rate. According to the method of the invention, based on reasonable relay selection modes, the switching rate of relay nodes is greatly reduced, the duration time of the relay nodes is improved, and system performance is improved.

Description

technical field [0001] The invention belongs to the technical field of communication routing or communication path search in the field of wireless communication networks, relates to the use of selective relay technology, and specifically relates to a relay selection scheme based on user movement in D2D communication. Background technique [0002] With the development of wireless communication systems, how to make full use of limited resources has always been a hot research topic. In order to further improve resource utilization, 3GPP has launched a series of standardization work, such as constructing heterogeneous networks and cell clustering. Operators are also increasing their investment in SmallCell. Compared with investing a lot of money to lay small base stations, operators are more inclined to the smooth evolution of the system. Device Proximity Services (Device Proximity Services, also known as D2D) technology can realize communication between communication devices wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/02H04W40/22H04W52/18
CPCH04W28/0215H04W28/0221H04W40/22H04W52/18
Inventor 周瑾戴建新徐曼蒋俐谢琳翠
Owner NANJING UNIV OF POSTS & TELECOMM
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