Network assisted device to device discovery

Patent metadata

Field	Value
Publication number	US-2016014589-A1
Application number	US-201314767671-A
Country	US
Kind code	A1
Filing date	Dec 20, 2013
Priority date	Feb 22, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

Technology for a user equipment (UE) to communicate in a device to device (D2D) network is described. A temporary identification (Temp ID) can be received from an enhanced node B (eNB). A D2D discovery resource allocation can be received within a physical uplink channel from the eNB. A UE D2D discovery resource can be selected from the D2D discovery resource allocation based on the Temp ID. A D2D discovery beacon can be transmitted from the UE D2D discovery resource to enable other UEs to detect the UE.

First claim

What is claimed is:

1 . A user equipment (UE) operable to communicate in a device to device (D2D) network, having computer circuitry configured to:
receive a temporary identification (Temp ID) from an enhanced node B (eNB); receive a D2D discovery resource allocation within a physical uplink channel from the eNB; select a UE D2D discovery resource from the D2D discovery resource allocation based on the Temp ID; and transmit a D2D discovery beacon from the UE D2D discovery resource to enable other UEs to detect the UE.

2 . The computer circuitry of claim 1 , wherein the physical uplink channel is a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

3 . The computer circuitry of claim 1 , further configured to:
discover a Temp ID for the other UEs in the D2D discovery resource allocation; and communicate to the eNB, using a physical uplink shared channel (PUSCH), a list of Temp IDs of the other UEs that are discovered.

4 . The computer circuitry of claim 1 , further configured to receive a list of discovered UEs from the eNB using a physical uplink shared channel (PUSCH).

5 . The computer circuitry of claim 1 , further configured to receive a unique Temp ID from the eNB for each antenna at the UE.

6 . The computer circuitry of claim 1 , further configured to:
receive a D2D discovery beacon from the other UEs; and determine the Temp ID of the other UEs based on the D2D discovery beacon.

7 . The computer circuitry of claim 1 , further configured to select the UE D2D discovery resource from the D2D discovery resource allocation based on:
the Temp ID; and a cell identification (cell ID) of the eNB.

8 . The computer circuitry of claim 7 , wherein the UE identifies a resource block index, a slot index, and a discovery sequence index, based on the temp ID and the cell ID.

9 . An enhanced node B (eNB) operable to communicate in a device to device (D2D) network, having computer circuitry configured to:
communicate a D2D temporary identification (Temp ID) to a user equipment (UE); allocate a D2D discovery resource within a physical uplink channel for D2D discovery by UEs served by the eNB; receive, from the UE, a list of Temp IDs of UEs discovered by the UE; and communicate a list of discovered UEs, based on the list of Temp IDs, to the UE.

10 . The computer circuitry of claim 9 , wherein the physical uplink channel is a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).

11 . The computer circuitry of claim 9 , wherein the received list of Temp IDs of UEs is received using a physical uplink shared channel (PUSCH).

12 . The computer circuitry of claim 9 , wherein the communicated list of discovered UEs is communicated to the UE using a physical uplink shared channel (PUSCH).

13 . The computer circuitry of claim 9 , wherein the communicated Temp ID is unique over a plurality of cells that are adjacent to the eNB.

14 . The computer circuitry of claim 9 , wherein a quantity of the D2D discovery resource changes based on a number of UEs within a cell served by the node.

15 . A server operable to communicate with a user equipment (UE) that is operable to communicate in a device to device (D2D) network, the server having computer circuitry configured to:
assign a temporary ID (Temp ID) to a user equipment (UE), wherein the Temp ID is configured to enable the UE to select a UE D2D discovery resource for use in D2D discovery from a D2D discovery resource allocated by an eNB; receive a list of Temp IDs discovered by the UE within the D2D discovery resource allocated by the eNB; and publish, for the list of Temp IDs discovered, a list of UE identifications associated with each Temp ID for communication to the UE to enable the UE to discover other UEs and form a D2D link.

16 . The computer circuitry of claim 15 , wherein a number of the Temp IDs available to be assigned by the server is sufficient to allow each UE served by the eNB to have a unique D2D discovery resource.

17 . The computer circuitry of claim 15 , wherein the Temp ID and a mapping rule enables the UE to select a UE D2D discovery resource source location within the D2D discovery resource allocated by the eNB.

18 . The computer circuitry of claim 17 , wherein the mapping rule comprises the number of resource elements in a resource block multiplied by a resource block index (RB index) added to a sequence identification (sequence ID).

19 . The computer circuitry of claim 18 , wherein the RB index is determined at the UE based on the Temp ID.

20 . The computer circuitry of claim 18 , wherein the sequence ID is determined at the UE based on the Temp ID.

21 . The computer circuitry of claim 19 , wherein a new RB index is computed by modulating the sum of the RB index and the sequence ID by 78.

22 . The computer circuitry of claim 15 , further configured to prevent half-duplexing by assigning a new Temp ID to a UE that has transmitted a D2D discovery beacon.

23 . A method for allocating a device to device (D2D) discovery resource by an enhanced node B (eNB) to a user equipment (UE), comprising:
receiving an assignment of a temporary identification (temp ID) at the UE from the eNB, wherein the temp ID is unique for each UE operating in a cell served by the eNB; identifying a unique transmission location in a physical uplink control channel (PUCCH), based on the Temp ID, for communication of a D2D discovery beacon by the UE; and transmitting the D2D discovery beacon from the UE at the unique transmission location to enable other D2D devices to discover the UE.

24 . The method of claim 23 , wherein identifying the unique transmission location further comprises receiving an allocation of a selected number of slots in the PUCCH for a discovery zone, wherein each slot comprises a selected number of resource blocks.

25 . The method of claim 24 , wherein each of the resource blocks further comprise a selected number of subcarriers and a selected number of orthogonal frequency-division multiplexing (OFDM) symbols.

26 . The method of claim 25 , wherein a subcarriers length for each of the resource blocks is a length-12 quadrature phase shift keying (QPSK) modulated sequence with a selected peak-to-average power ratio (PAPR).

27 . The method of claim 26 , wherein the OFDM symbols length for each of the resource blocks is 7 OFDM symbols using an orthogonal cover code.

28 . The method of claim 23 , further comprising identifying a unique transmission location using a Hadamard matrix.

29 . The method of claim 23 , wherein the discovery beacon is transmitted based on a D2D discovery sequence design.

30 . The method of claim 23 , wherein the D2D discovery sequence design is based on:
a correlation property; a resource available; and a peak-to-average power ratio (PAPR).

Assignees

• Niu Huaning
• Panteleev Sergey
• Khoryaev Alexey
• Chatterjee Debdeep
• Xiong Gang

Inventors

• Niu Huaning
• Panteleev Sergey
• Khoryaev Alexey
• Chatterjee Debdeep
• Xiong Gang

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/30

  Resource management for broadcast services · CPC title

• H04W72/21

  in the uplink direction of a wireless link, i.e. towards the network · CPC title

• H04W48/18 Primary

  Selecting a network or a communication service · CPC title

• H04W76/28

  Discontinuous transmission [DTX]; Discontinuous reception [DRX] · CPC title