Terminal for supporting device to device communication and method for operating same

Patent metadata

Field	Value
Publication number	US-2016143078-A1
Application number	US-201414898728-A
Country	US
Kind code	A1
Filing date	Jul 31, 2014
Priority date	Jul 31, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

An embodiment of the present invention provides a terminal including a PDCP layer which relays a D2D-dedicated IP packet from an upper layer to a lower layer, an RLC layer which processes the received packet in adaptation to the radio channel condition and transfers the processed data to a MAC layer, and a MAC layer which selects, when D2D packet data come into being, resources for D2D link without requesting scheduling from the eNB and multiplexes the data received through D2D-dedicated logical channels, and an operation method of the terminal. Particularly, an embodiment of the present invention provides a novel MAC operation method of a terminal supporting D2D communication.

First claim

1 .- 20 . (canceled)

21 . A method for device to device (D2D) communication by a source terminal, the method comprising:
generating first information to be transmitted via the D2D communication; transmitting the first information from an upper layer to a lower layer of the source terminal via a D2D dedicated logical channel; and transmitting the first information to a target terminal via the D2D communication.

22 . The method of claim 21 , further comprising:
generating second information to be transmitted via a cellular network communication; transmitting the second information from the upper layer to the lower layer of the source terminal via a logical channel different from the D2D dedicated logical channel; and transmitting the second information to a terminal via the cellular network communication.

23 . The method of claim 21 , further comprising:
multiplexing the first information received via the D2D dedicated logical channel and a second information received via a logical channel different from the D2D dedicated logical channel, respectively.

24 . The method of claim 21 , further comprising:
multiplexing the first information based on an identity of the source terminal and an identity of the target terminal.

25 . The method of claim 21 , further comprising:
buffering the first information received via the D2D dedicated logical channel to a first buffer and a second information received via a logical channel different from the D2D dedicated logical channel to a second buffer, respectively.

26 . The method of claim 25 ,
transmitting, to a serving base station, a D2D buffer status report (BSR) for reporting information about the amount of data available for transmission in the first buffer of the source terminal.

27 . The method of claim 26 , wherein the D2D BSR is transmitted via a medium access control (MAC) control element (CE).

28 . The method of claim 27 , wherein the MAC CE includes a MAC sub-header, and wherein a logical channel identity included in the MAC sub-header indicates that the MAC CE includes the BSR.

29 . The method of claim 25 , wherein a MAC CE for BSR of the second buffer is prior to a MAC CE for BSR of the first buffer.

30 . The method of claim 21 , wherein a MAC entity of the terminal is divided into a first MAC entity for the D2D communication and a second MAC entity for a cellular network communication.

31 . A source terminal for device to device (D2D) communication, the source terminal comprising:
a transceiver configured to transmit and receive a signal; and a controller configured to:
generate first information to be transmitted via the D2D communication,
transmit the first information from an upper layer to a lower layer of the source terminal via a D2D dedicated logical channel, and
transmit the first information to a target terminal via the D2D communication.

32 . The source terminal of claim 31 , wherein the controller is further configured to:
generate second information to be transmitted via a cellular network communication, transmit the second information from the upper layer to the lower layer of the source terminal via a logical channel different from the D2D dedicated logical channel, and transmit the second information to a terminal via the cellular network communication.

33 . The source terminal of claim 31 , wherein the controller is further configured to multiplex the first information received via the D2D dedicated logical channel and a second information received via a logical channel different from the D2D dedicated logical channel, respectively.

34 . The source terminal of claim 31 , wherein the controller is further configured to multiplex the first information based on an identity of the source terminal and an identity of the target terminal.

35 . The source terminal of claim 31 , wherein the controller is further configured to buffer the first information received via the D2D dedicated logical channel to a first buffer and a second information received via a logical channel different from the D2D dedicated logical channel to a second buffer, respectively.

36 . The source terminal of claim 35 , wherein the controller is further configured to transmit, to a serving base station, a D2D buffer status report (BSR) for reporting information about the amount of data available for transmission in the first buffer of the source terminal.

37 . The source terminal of claim 36 , wherein the D2D BSR is transmitted via a medium access control (MAC) control element (CE).

38 . The source terminal of claim 37 , wherein the MAC CE includes a MAC sub-header, and wherein a logical channel identity included in the MAC sub-header indicates that the MAC CE includes the BSR.

39 . The source terminal of claim 35 , wherein a MAC CE for BSR of the second buffer is prior to a MAC CE for BSR of the first buffer.

40 . The source terminal of claim 31 , wherein a MAC entity of the terminal is divided into a first MAC entity for the D2D communication and a second MAC entity for a cellular network communication.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Jeong Kyeongin

Classifications

• H04W72/02

  Selection of wireless resources by user or terminal · CPC title

• H04W76/14 Primary

  Direct-mode setup · CPC title

• H04W28/0278 Primary

  using buffer status reports (dynamic wireless traffic scheduling definition H04W72/12) · CPC title

• H04W28/06

  Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} · CPC title

• H04W72/231

  the control data signalling from the layers above the physical layer, e.g. RRC or MAC-CE signalling · CPC title