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D2D (Device to Device) discovery signal transmitting method and D2D(Device to Device) discovery signal transmitting device in LTE network

A technology for discovering signals and sending methods, applied in wireless communication, access restrictions, electrical components, etc., can solve problems such as no mature solution, difficulty in multiplexing wireless resources, waste of wireless resources, etc.

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

[0010] However, there is a serious defect in this method. In an actual network, the number of UEs requesting discovery signal transmission resources (hereinafter referred to as discovery resources) to the eNB in ​​different periods is dynamically changed. However, because the size of the DRP is semi-statically configured , which leads to the fact that the size of the DRP cannot be adjusted in real time to adapt to the number of resources occupied by the UE actually participating in the discovery signal transmission
When the number of resources occupied by the UE that actually sends the discovery signal is less than the number of resources contained in the DRP, after resource hopping is performed according to formula (1) and formula (2), the transmission resources of the UE that actually sends the discovery signal will be distributed to Within the entire DRP range, the unused radio resources in the DRP will be divided, and the divided radio resources are difficult to be reused in the LTE system, which will eventually lead to waste of radio resources
[0011] Under the premise of eliminating the half-duplex limitation, how to realize the indication of D2D discovery resources with low signaling overhead and avoid the waste of wireless resources, there is no mature solution to this problem.

Method used

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  • D2D (Device to Device) discovery signal transmitting method and D2D(Device to Device) discovery signal transmitting device in LTE network
  • D2D (Device to Device) discovery signal transmitting method and D2D(Device to Device) discovery signal transmitting device in LTE network
  • D2D (Device to Device) discovery signal transmitting method and D2D(Device to Device) discovery signal transmitting device in LTE network

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Effect test

Embodiment 1

[0097] In this embodiment, the eNB semi-statically configures the location of the DRP, the size T in the time domain, and the size F in the frequency domain through signaling. At the same time, the eNB semi-statically indicates the resource hopping range. The number of times a discovery signal is sent may change in each discovery cycle. The number of discovery signal transmissions by the UE based on the above parameters and the current period k p To determine the sending position of the discovery signal within the period p, the specific steps are as follows:

[0098] Step 310: The UE receives the signaling from the eNB, and obtains the location of the DRP, the size T in the time domain and the size F in the frequency domain, as well as the resource hopping range and initial resource indication.

[0099] The frequency domain size F of the DRP can be indicated directly or indirectly. If it is a direct method, the eNB directly notifies the UE of the start and end positions of ...

Embodiment 2

[0130] In this embodiment, the eNB semi-statically configures the position and the time domain size T and the frequency domain size F of the DRP through signaling. Before each discovery period, the eNB dynamically indicates the resource hopping range. In this embodiment, the time domain size of the resource hopping range is equal to the DRP, and the frequency domain size F' p ≤F. The UE determines the sending position of the discovery signal in the period p according to the above parameters and the resource hopping range of the current period. The specific steps are as follows:

[0131] Step 410: The UE receives the signaling from the eNB, and obtains the location of the DRP, the number k of sending discovery signals, the size T of the time domain and the size F of the frequency domain, and an initial resource indication.

[0132] Similar to Embodiment 1, the frequency domain size F of the DRP may be indicated directly or indirectly. If it is a direct method, the eNB direct...

Embodiment 3

[0155] In this embodiment, the eNB semi-statically configures the location of the DRP and the size T in the time domain and the size F in the frequency domain of the DRP through signaling. The number of times the discovery signal is sent may vary within each discovery cycle. The number of discovery signal transmissions by the UE based on the above parameters and the current period k p To determine the sending position of the discovery signal within the period p, the specific steps are as follows:

[0156] Step 510: UE receives eNB signaling, obtains DRP location, time domain size T and frequency domain size F, and initial resource indication.

[0157] Similar to Embodiment 1, the frequency domain size F of the DRP may be indicated directly or indirectly. If it is a direct method, the eNB directly notifies the UE of the start and end positions of the frequency domain resource occupied by the DRP in the DRP subframe through signaling. If the method is indirect, the eNB indica...

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Abstract

The invention discloses a D2D (Device to Device) discovery signal transmitting method. Through receiving semi-static configuration of an eNB, the position and the size of a DRP are acquired; according to eNB indication, a resource jump range and the number of retransmission of discovery signals in each period are determined; and according to the above parameters and the corresponding resource jump mode, the resource position for transmitting a reference signal in each period is determined. When the method and the device of the invention are applied, the signaling burden of the wireless network and loss of the wireless resources can be reduced.

Description

technical field [0001] The present application relates to the technical field of mobile communication, and in particular, the present application relates to a method and device for sending a D2D discovery signal in an LTE network. Background technique [0002] At present, the D2D (Device to Device) communication technology has been accepted by the 3GPP standard due to its great potential value in the field of public safety and ordinary civilian communication, and has become a candidate evolution direction of the LTE-A (LTE Advanced) system. [0003] According to the current 3GPP conclusion, a UE supporting the D2D function (hereinafter referred to as UE) will transmit and receive D2D signals in a half-duplex manner, that is, the UE will not support simultaneous transmission and reception of D2D signals. When the UE is covered by the wireless network, the D2D communication will only occupy the uplink carrier frequency (FDD system) or uplink subframe (TDD system). [0004] Be...

Claims

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Application Information

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IPC IPC(8): H04W48/16H04W76/02H04W48/08
Inventor 张世昌李迎阳孙程君
Owner BEIJING SAMSUNG TELECOM R&D CENT
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