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Device-to-device (D2D) discovery signal transmission method and D2D discovery signal transmission device in long-term evolution (LTE) network

A technology for discovering signals and sending methods, applied in the field of mobile communications, can solve problems such as limited number of patterns, no mature solutions, and limited resource allocation flexibility

Active Publication Date: 2016-04-06
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method relies on standard-defined resource patterns, and the number of standard-defined patterns is limited, which limits the flexibility of resource allocation
[0007] Under the premise of eliminating the half-duplex limitation, how to realize the indication of D2D discovery resources with low signaling overhead while ensuring flexibility, there is no mature solution to this problem.

Method used

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  • Device-to-device (D2D) discovery signal transmission method and D2D discovery signal transmission device in long-term evolution (LTE) network
  • Device-to-device (D2D) discovery signal transmission method and D2D discovery signal transmission device in long-term evolution (LTE) network
  • Device-to-device (D2D) discovery signal transmission method and D2D discovery signal transmission device in long-term evolution (LTE) network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] In this embodiment, the eNB informs the UE of the number of RUs T contained in the current DRP in the time domain through RRC signaling, and informs the UE of the specific DR index r in each cycle through specific signaling. The UE determines the number of RUs in each cycle through the above information. The number of RUs and RU locations included in the DR, the specific steps are as follows:

[0077] Step 310: The UE receives eNB signaling, and obtains the DRP position and the time domain size T of the DRP in a period.

[0078] Step 320: The UE determines the number k of RUs included in the DR and the frequency domain size F of the DRP.

[0079] at this time k = max k A [ 2 , T / 2 ] max ( C T - 1 k - 1 , B - 2 × R PUCCH ) , F = min ( C T - 1 k - 1 , B - 2 × P PUCCH ) .

[0080] Step 330: The UE receives eNB specific signaling in each cycle to obtain ...

Embodiment 2

[0087] In this embodiment, the eNB informs the UE of the number of RUs T contained in the current DRP in the time domain and the DR size k through RRC signaling, and indicates the UE-specific DR index r in the first period after the UE applies for resource discovery. o , The UE determines the number of RUs and RU positions included in the DR in each cycle through the above information, and the specific steps are as follows:

[0088] Step 410: The UE receives the eNB signaling, and obtains the DRP position and the time domain size T of the DRP in a period, and Δ c Value.

[0089] Step 420: The UE determines the frequency domain size F of the DRP.

[0090] at this time F = min ( C T - 1 k - 1 , B - 2 × R PUCCH ) .

[0091] Step 430: UE receives eNB specific signaling, and obtains UE specific DR index r o .

[0092] In this embodiment, the eNB only sends signaling to the UE in the first cycle, and carries the UE-specific DR index r in t...

Embodiment 3

[0102] In this embodiment, the eNB informs the UE of the number of RUs T contained in the current DRP in the time domain and the DR size k through RRC signaling, and indicates the UE-specific DR index r in the first period after the UE applies for resource discovery. o , The UE determines the number of RUs and RU positions included in the DR in each cycle through the above information, and the specific steps are as follows:

[0103] Step 510: The UE receives the eNB signaling, and obtains the DRP position and the value of the time domain size T and X of the DRP in a period.

[0104] Step 520: The UE receives eNB specific signaling and obtains UE specific DR index r o .

[0105] In this embodiment, the eNB only sends signaling to the UE in the first cycle, and carries the UE-specific DR index r in the first cycle. o , In the subsequent cycle, the UE itself according to the DR index r of the previous cycle p-1 Calculate the DR index r of the current period p .

[0106] Step 540: The UE r...

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Abstract

The invention provides a device-to-device (D2D) discovery signal transmission method and a D2D discovery signal transmission device in a long-term evolution (LTE) network. According to the D2D discovery signal transmission method, user equipment (UE) acquires position and size of a resource pool (DRP) through receiving radio resource control (RRC) signaling of an enhanced node base station (eNB) and can determine the time frequency position of a discovery resource (DR) according to a DR index indicated by the eNB. According to different realizing solutions of the D2D finding signal transmission method and the D2D finding signal transmission device, collision of different UE finding signals can be prevented through coordinating a small amount of wireless network signaling, and mutual discovery between two sets of UE is realized in a relatively short time, thereby maximally reducing signaling load of a wireless network and loss of a wireless resource. Furthermore the D2D discovery signal transmission method and the D2D discovery signal transmission device has advantages of small modification of an existing system, no effect to system compatibility, simple and efficient realization.

Description

Technical field [0001] This application relates to the field of mobile communication technology. Specifically, this application relates to a method and device for sending a D2D discovery signal in an LTE network. Background technique [0002] At present, D2D (Device to Device) communication technology has been accepted by the 3GPP standard due to its huge potential value in the field of public safety and ordinary civil communication, and has become a candidate evolution direction for the LTE-A (LTE Advanced) system. [0003] According to the current 3GPP conclusions, UEs supporting the D2D function (hereinafter referred to as UE) will use a half-duplex mode to transmit and receive D2D signals, that is, the UE will not support simultaneous transmission and reception of D2D signals. When the UE is under wireless network coverage, D2D communication will only occupy the uplink carrier frequency (FDD system) or uplink subframe (TDD system). [0004] Because the UE works in a half-duplex ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/00H04W8/00H04W72/04
Inventor 张世昌李迎阳孙程君
Owner BEIJING SAMSUNG TELECOM R&D CENT
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