Ue discovery method and system in d2d network

Patent metadata

Field	Value
Publication number	US-2017142703-A1
Application number	US-201615322663-A
Country	US
Kind code	A1
Filing date	Feb 5, 2016
Priority date	Feb 6, 2015
Publication date	May 18, 2017
Grant date	—

Abstract

The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data transmission rate beyond a 4G communication system such as LTE. The present disclosure provides a method for performing device to device (D2D) discovery by a user equipment (UE), which is out of the coverage area serviced by a base station, in a wireless communication network, the method comprising the operations of: receiving pre-configuration information for transmitting a discovery message; and transmitting the discovery message in a transmission resource determined on the basis of the pre-configuration information, wherein the pre-configuration information includes a list of pools for transmitting the discovery message, and the transmission resource is determined from the list of pools.

First claim

1 . A method for performing device to device (D2D) discovery performing by a user equipment (UE) existing outside of coverage in which a service is provided by a base station in a wireless communication network, the method comprising:
receiving pre-configuration information for the transmission of a discovery message; and transmitting the discovery message in a transmission resource determined based on the pre-configuration information, wherein the pre-configuration information comprises a pool list for the discovery message transmission and the transmission resource is determined from the pool list.

2 . The method of claim 1 , further comprising:
discovering a signal from an adjacent UE; and determining whether the received signal received power (RSRP) of the discovered signal is less than a threshold value, wherein the threshold value is included in the pre-configuration information.

3 . The method of claim 2 , further comprising:
transmitting, when the RSRP is less than the threshold value, at least one of system information and a synchronization signal for D2D communication in the transmission resource determined based on the pre-configuration information.

4 . The method of claim 1 , wherein the pre-configuration information further comprises at least one among the number of times of retransmission of a discovery message, the number of subframe bitmaps during one discovery period, and information indicating a discovery offset.

5 . The method of claim 1 further comprising:
receiving, from an adjacent UE, at least one of system information and a synchronization signal for D2D communication in the transmission resource determined based on the pre-configuration information; and
synchronizing with the adjacent UE by using the received synchronization signal.

6 . The method of claim 5 , further comprising:
determining whether the received signal received power (RSRP) of the received synchronization signal is less than the threshold value included in the pre-configuration information; and transmitting, when the RSRP is less than the threshold value, at least one of system information and a synchronization signal for D2D communication in the transmission resource determined based on the pre-configuration information, wherein an ID of the transmitted synchronization signal is determined based on the received system information.

7 . The method of claim 6 , wherein the received system information comprises information indicating whether the adjacent UE is inside the coverage, and, when the adjacent UE is inside the coverage, the ID of the transmitted synchronization signal is determined so that the ID of the transmitted synchronization signal is identical to an ID of the received synchronization signal.

8 . A user equipment (UE) existing outside of coverage in which a service is provided by a base station in a wireless communication network, the UE comprising:
a controller configured to control to:
receive pre-configuration information for the transmission of a discovery message, and
transmit the discovery message in a transmission resource determined based on the pre-configuration information; and
a transceiver configured to:
receive the pre-configuration information, and
transmit the discovery message, by a control of the controller,
wherein the pre-configuration information comprises a pool list for the discovery message transmission and the transmission resource is determined from the pool list.

9 . The UE of claim 8 , wherein the controller is further configured to:
discover a signal from an adjacent UE, and determine whether the received signal received power (RSRP) of the discovered signal is less than a threshold value, wherein the threshold value is included in the pre-configuration information.

10 . The UE of claim 9 , wherein, when the RSRP is less than the threshold value, the controller is further configured to transmit at least one of system information and a synchronization signal for D2D communication in the transmission resource determined based on the pre-configuration information.

11 . The UE of claim 8 , wherein the pre-configuration information further comprises at least one among the number of times of retransmission of a discovery message, the number of subframe bitmaps during one discovery period, and information indicating a discovery offset.

12 . The UE of claim 8 , wherein the controller is further configured to:
receive, from an adjacent UE, at least one of system information and a synchronization signal for D2D communication in the transmission resource determined based on the pre-configuration information, and synchronize with the adjacent UE by using the received synchronization signal.

13 . The UE of claim 12 , wherein the controller is further configured to:
determine whether the received signal received power (RSRP) of the received synchronization signal is less than the threshold value included in the pre-configuration information, and transmit, when the RSRP is less than the threshold value, at least one of system information and a synchronization signal for D2D communication in the transmission resource determined based on the pre-configuration information, wherein the controller determines an ID of the transmitted synchronization signal on the basis of the received system information.

14 . The UE of claim 13 , wherein the received system information comprises information indicating whether the adjacent UE is inside the coverage, and, when the adjacent UE is inside the coverage, the controller is further configured to determine the ID of the transmitted synchronization signal so that the ID of the transmitted synchronization signal is identical to an ID of the received synchronization signal.

15 . A method for performing device to device (D2D) discovery by a user equipment (UE) in a wireless communication network, the method comprising:
receiving a message including pre-configuration information for D2D discovery message transmission; determining to operate as a synchronization reference UE when an instruction is received from a base station or a pre-defined condition is satisfied; in a transmission resource determined based on the pre-configuration information, transmitting a synchronization signal used for synchronization acquisition of a time and a frequency and transmitting system information including transmission timing information of a discovery message; and transmitting the discovery message in the transmission resource determined based on the pre-configuration information.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Xue Peng
• Ryu Hyun-Seok
• Park Seung-Hoon
• Choi Sang-Won

Classifications

• H04W72/51 Primary

  based on terminal or device properties · CPC title

• H04W72/0453

  Resources in frequency domain, e.g. a carrier in FDMA · CPC title

• H04W72/02

  Selection of wireless resources by user or terminal · CPC title

• H04W56/00

  Synchronisation arrangements · CPC title

• H04W76/14 Primary

  Direct-mode setup · CPC title