METHOD AND APPARATUS FOR PERFORMING DEVICE-TO-DEVICE COMMUNICATION

• US 20150004901A1
• Filed: 06/27/2014
• Published: 01/01/2015
• Est. Priority Date: 06/28/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: AGIWAL, Anil, CHANG, Young-Bin
• Granted Patent: US 10,111,267 B2
• Time in Patent Office: Days
• US Class Current: 455/39
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 76/11 Allocation or use of connection identifiers
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

A method and apparatus for performing Device-to-Device (D2D) communication are provided. The method includes being assigned a transmission and reception indicator and an index during D2D connection setup between a User Equipment (UE) and a Base Station (BS) by the UE, the transmission and reception indicator indicating a transmission role or a reception role and the index indicating another UE for D2D communication, receiving the transmission and reception indicator, the index, and resource information for the D2D communication on a control channel by the UE, and performing, by the UE, a transmission operation or a reception operation to or from the other UE indicated by the index in resources indicated by the resource information according to the transmission role or the reception role indicated by the transmission and reception indicator.

Claims

1. A method for performing Device-to-Device (D2D) communication, the method comprising:

being assigned a transmission and reception indicator and an index during D2D connection setup between a User Equipment (UE) and a Base Station (BS) by the UE, the transmission and reception indicator indicating a transmission role or a reception role and the index indicating another UE for D2D communication;

receiving the transmission and reception indicator, the index, and resource information for the D2D communication on a control channel by the UE; and

performing, by the UE, a transmission operation or a reception operation to or from the other UE indicated by the index in resources indicated by the resource information according to the transmission role or the reception role indicated by the transmission and reception indicator.

2. The method of claim 1, wherein a different index is assigned to each D2D connection.

3. The method of claim 2, wherein the index is a pair of a transmission index and a reception index and one index pair is assigned to each D2D connection, and

wherein the index reception comprises receiving an index corresponding to the transmission and reception indicator between the transmission index and the reception index.

4. The method of claim 1, wherein the being assigned the transmission and reception indicator and the index comprises:

transmitting a direct communication request message including an IDentifier (ID) of the UE to the other UE and receiving a direct communication response message including an ID of the other UE from the other UE by the UE;

transmitting a direct communication request message including the ID of the UE and the ID of the other UE to the BS by the UE;

receiving a direct communication response message including a network temporary ID of the UE and the index from the BS by the UE; and

transmitting a direct communication complete message to the BS by the UE.

5. The method of claim 1, wherein the being assigned the transmission and reception indicator and the index comprises assigning an index indicating the UE and transmitting the assigned index to the BS by the UE.

6. The method of claim 1, wherein, if the other UE is connected to another BS different from the BS, the resources indicated by the resource information are determined by coordination between the BS and the other BS.

7. A method for performing Device-to-Device (D2D) communication, the method comprising:

assigning a transmission and reception indicator and an index to a User Equipment (UE) during D2D connection setup between the UE and a Base Station (BS) by the BS, the transmission and reception indicator indicating a transmission role or a reception role and the index indicating another UE for D2D communication; and

transmitting the transmission and reception indicator, the index, and resource information for the D2D communication on a control channel to the UE by the BS,

wherein the D2D communication is performed between the UE and the other UE by performing a transmission operation or a reception operation between the UE and the other UE indicated by the index in resources indicated by the resource information according to the transmission role or the reception role indicated by the transmission and reception indicator.

8. The method of claim 7, wherein a different index is assigned to each D2D connection.

9. The method of claim 8, wherein the index is a pair of a transmission index and a reception index and one index pair is assigned to each D2D connection, and

wherein the index transmission comprises transmitting an index corresponding to the transmission and reception indicator between the transmission index and the reception index.

10. The method of claim 7, wherein the assigning of the transmission and reception indicator and the index to the UE comprises:

receiving a direct communication request message including an IDentifier (ID) of the UE and an ID of the other UE from the UE by the BS;

transmitting a direct communication response message including a network temporary ID of the UE and the index to the UE by the BS; and

receiving a direct communication complete message from the UE by the BS.

11. The method of claim 7, wherein the assigning of the transmission and reception indicator and the index to the UE comprises receiving an index assigned by the UE from the UE by the BS.

12. The method of claim 7, wherein, if the other UE is connected to another BS different from the BS, the resources indicated by the resource information are determined by coordination between the BS and the other BS.

13. A User Equipment (UE) for performing Device-to-Device (D2D) communication, the UE comprising:

a transceiver configured to perform D2D communication with another UE through a direct communication link; and

a controller configured to control a transmission and reception indicator and an index to be assigned during D2D connection setup between the UE and a Base Station (BS), and to control the transmission and reception indicator indicating a transmission role or a reception role and the index indicating the other UE for the D2D communication, reception of the transmission and reception indicator, the index, and resource information for the D2D communication on a control channel, and to perform of a transmission operation or a reception operation to or from the other UE indicated by the index in resources indicated by the resource information according to the transmission role or the reception role indicated by the transmission and reception indicator.

14. The UE of claim 13, wherein a different index is assigned to each D2D connection.

15. The UE of claim 14, wherein the index is a pair of a transmission index and a reception index and one index pair is assigned to each D2D connection, and

wherein the controller controls reception of an index corresponding to the transmission and reception indicator between the transmission index and the reception index.

16. The UE of claim 13, wherein the controller controls transmission of a direct communication request message including an IDentifier (ID) of the UE to the other UE, reception of a direct communication response message including an ID of the other UE from the other UE, transmission of a direct communication request message including the ID of the UE and the ID of the other UE to the BS, reception of a direct communication response message including a network temporary ID of the UE and the index from the BS, and transmission of a direct communication complete message to the BS.

17. The UE of claim 13, wherein the controller controls assignment of the index and transmission of the assigned index to the BS.

18. The UE of claim 13, wherein, if the other UE is connected to another BS different from the BS, the resources indicated by the resource information are determined by coordination between the BS and the other BS.

19. A Base Station (BS) for performing Device-to-Device (D2D) communication, the BS comprising:

a controller configured to control assignment of a transmission and reception indicator and an index to a User Equipment (UE) during D2D connection setup between the UE and the BS, the transmission and reception indicator indicating a transmission role or a reception role and the index indicating another UE for D2D communication, and transmission of the transmission and reception indicator, the index, and resource information for the D2D communication on a control channel to the UE; and

a transceiver configured to communicate with at least one UE under control of the controller,

wherein the D2D communication is performed between the UE and the other UE by performing a transmission operation or a reception operation between the UE and the other UE determined by the index in resources indicated by the resource information according to the transmission role or the reception role indicated by the transmission and reception indicator.

20. The BS of claim 19, wherein a different index is assigned to each D2D connection.

21. The BS of claim 20, wherein the index is a pair of a transmission index and a reception index and one index pair is assigned to each D2D connection, and

wherein the controller controls transmission of an index corresponding to the transmission and reception indicator between the transmission index and the reception index.

22. The BS of claim 19, wherein the controller controls reception of a direct communication request message including an IDentifier (ID) of the UE and an ID of the other UE from the UE, transmission of a direct communication response message including a network temporary ID of the UE and the index to the UE, and reception of a direct communication complete message from the UE.

23. The BS of claim 19, wherein the controller controls reception of an index assigned by the UE from the UE.

24. The BS of claim 19, wherein, if the other UE is connected to another BS different from the BS, the resources indicated by the resource information are determined by coordination between the BS and the other BS.

25. A method for performing Device-to-Device (D2D) communication, the method comprising:

being assigned a network temporary IDentifier (ID) for D2D communication during D2D connection setup with a Base Station (BS) by a User Equipment (UE);

receiving resource information for the D2D communication on a control channel masked with the network temporary ID by the UE; and

performing a transmission operation or a reception operation to or from another UE determined based on the network temporary ID in resources indicated by the resource information by the UE.

26. The method of claim 25, wherein a different network temporary ID is assigned to each D2D connection, and

wherein the being assigned of the network temporary ID comprises being assigned a UE index for identifying UEs participating in the D2D communication, the control channel includes the UE index, and the performing of a transmission operation or a reception operation comprises performing the transmission operation or the reception operation according to a role determined based on the UE index.

27. The method of claim 25, wherein the network temporary ID is an ID pair of a transmission ID and a reception ID that determine a role of the UE in each D2D connection,

wherein the control channel is masked with one of the transmission ID and the reception ID included in the ID pair, and

wherein the performing of a transmission operation or a reception operation comprises performing the transmission operation or the reception operation according to a role determined based on the transmission ID or the reception ID used for masking the control channel.

28. A method for performing Device-to-Device (D2D) communication, the method comprising:

assigning a network temporary IDentifier (ID) for D2D communication to a User Equipment (UE) during D2D connection setup with the UE by a Base Station (BS); and

transmitting resource information for the D2D communication on a control channel masked with the network temporary ID to the UE by the BS,

wherein the D2D communication is performed between the UE and another UE by a transmission operation or a reception operation between the UE and the other UE determined based on the network temporary ID in resources indicated by the resource information.

29. The method of claim 28, wherein a different network temporary ID is assigned to each D2D connection, and

wherein the assignment comprises assigning a UE index for identifying UEs participating in the D2D communication, the control channel includes the UE index, and the D2D communication between the UE and the other UE is performed by the transmission operation or the reception operation according to a role determined based on the UE index.

30. The method of claim 28, wherein the network temporary ID is an ID pair of a transmission ID and a reception ID that determine a role of the UE in each D2D connection,

wherein the control channel is masked with one of the transmission ID and the reception ID included in the ID pair, and

wherein the D2D communication is performed by the transmission operation or the reception operation according to a role determined based on the transmission ID or the reception ID used for masking the control channel.

31. A User Equipment (UE) for performing Device-to-Device (D2D) communication, the UE comprising:

a transceiver configured to perform D2D communication with another UE through a direct communication link; and

a controller configured to control a network temporary IDentifier (ID) for D2D communication to be assigned during D2D connection setup with a Base Station (BS), and to control reception of resource information for the D2D communication on a control channel masked with the network temporary ID and performing of a transmission operation or a reception operation to or from another UE determined based on the network temporary ID in resources indicated by the resource information.

32. The UE of claim 31, wherein a different network temporary ID is assigned to each D2D connection,

wherein the control channel includes a UE index for identifying UEs participating in the D2D communication,

wherein the control channel includes the UE index, and

wherein the controller controls a transmission operation or a reception operation according to a role determined based on the UE index.

33. The UE of claim 31, wherein the network temporary ID is an ID pair of a transmission ID and a reception ID that determine a role of the UE in each D2D connection,

wherein the control channel is masked with one of the transmission ID and the reception ID included in the ID pair, and

wherein the controller controls a transmission operation or a reception operation according to a role determined based on the transmission ID or the reception ID used for masking the control channel.

34. A Base Station (BS) for performing Device-to-Device (D2D) communication, the BS comprising:

a controller configured to control assignment of a network temporary IDentifier (ID) for D2D communication to a User Equipment (UE) during D2D connection setup with the UE and transmission of resource information for the D2D communication on a control channel masked with the network temporary ID to the UE; and

a transceiver configured to communicate with at least one UE under control of the controller,

wherein the D2D communication is performed between the UE and another UE by a transmission operation or a reception operation between the UE and the other UE determined based on the network temporary ID in resources indicated by the resource information.

35. The BS of claim 34, wherein a different network temporary ID is assigned to each D2D connection, and

wherein the controller controls assignment of a UE index for identifying UEs participating in the D2D communication, the control channel includes the UE index, and the D2D communication between the UE and the other UE is performed by the transmission operation or the reception operation according to a role determined based on the UE index.

36. The BS of claim 34, wherein the network temporary ID is an ID pair of a transmission ID and a reception ID that determine a role of the UE in each D2D connection, the control channel is masked with one of the transmission ID and the reception ID included in the ID pair, and the D2D communication is performed by the transmission operation or the reception operation according to a role determined based on the transmission ID or the reception ID used for masking the control channel.

37. A method for performing Device-to-Device (D2D) communication, the method comprising:

being assigned a User Equipment (UE) pair IDentifier (ID) for D2D communication during D2D connection setup with a Base Station (BS) by a UE;

receiving the UE pair ID and resource information for the D2D communication on a control channel by the UE, the control channel being masked with a network temporary ID reserved for D2D communication; and

performing a transmission operation or a reception operation to or from another UE determined based on the UE pair ID in resources indicated by the resource information by the UE,

wherein the network temporary ID is the same for all D2D connections.

38. The method of claim 37, wherein the being assigned of the UE pair ID comprises being assigned a UE index for identifying UEs participating in the D2D communication,

wherein the control channel includes the UE index, and

wherein the performing of a transmission operation or a reception operation comprises performing the transmission operation or the reception operation according to a role determined based on the UE index.

39. The method of claim 37, wherein the UE pair ID is an ID pair of a transmission ID and a reception ID for determining a role of the UE for each D2D connection,

wherein the control channel includes one of the transmission ID and the reception ID in the ID pair, and

wherein the performing of a transmission operation or a reception operation comprises performing the transmission operation or the reception operation according to a role determined based on the transmission ID or the reception ID included in the control channel.

40. A method for performing Device-to-Device (D2D) communication, the method comprising:

assigning a User Equipment (UE) pair IDentifier (ID) for D2D communication to a UE during D2D connection setup with the UE by a Base Station (BS); and

transmitting the UE pair ID and resource information for the D2D communication on a control channel to the UE by the BS, the control channel being masked with a network temporary ID reserved for D2D communication,

wherein the D2D communication is performed between the UE and another UE by a transmission operation or a reception operation between the UE and the other UE based on the UE pair ID in resources indicated by the resource information, and

wherein the network temporary ID is the same for all D2D connections.

41. The method of claim 40, wherein the assigning of the UE pair ID comprises assigning a UE index for identifying UEs participating in the D2D communication, the control channel includes the UE index, and the D2D communication is performed between the UE and the other UE by the transmission operation or the reception operation according to a role determined based on the UE index.

42. The method of claim 40, wherein the UE pair ID is an ID pair of a transmission ID and a reception ID for determining a role of the UE for each D2D connection,

wherein the control channel includes one of the transmission ID and the reception ID in the ID pair, and

wherein the D2D communication is performed between the UE and the other UE by the transmission operation or the reception operation according to a role based on the transmission ID or the reception ID included in the control channel.

43. A User Equipment (UE) for performing Device-to-Device (D2D) communication, the UE comprising:

a transceiver configured to perform D2D communication with another UE on a direct communication link; and

a controller configured to control a UE pair IDentifier (ID) for D2D communication to be allocated to the UE during D2D connection setup with a Base Station (BS), to control reception of the UE pair ID and resource information for the D2D communication on a control channel, the control channel being masked with a network temporary ID reserved for D2D communication, and to control performing of a transmission operation or a reception operation to or from another UE determined based on the UE pair ID in resources indicated by the resource information,

wherein the network temporary ID is the same for all D2D connections.

44. The UE of claim 43, wherein a UE index for identifying UEs participating in the D2D communication is assigned, the control channel includes the UE index, and the controller controls the performing of the transmission operation or the reception operation according to a role determined based on the UE index.

45. The UE of claim 43, wherein the UE pair ID is an ID pair of a transmission ID and a reception ID for determining a role of the UE for each D2D connection,

wherein the control channel includes one of the transmission ID and the reception ID in the ID pair, and

wherein the controller controls the performing of the transmission operation or the reception operation according to a role determined based on the transmission ID or the reception ID included in the control channel.

46. A Base Station (BS) for performing Device-to-Device (D2D) communication, the BS comprising:

a controller configured to control assignment of a User Equipment (UE) pair IDentifier (ID) for D2D communication to a UE during D2D connection setup with the UE, and transmission of the UE pair ID and resource information for the D2D communication on a control channel to the UE, the control channel being masked with a network temporary ID reserved for D2D communication; and

a transceiver configured to communicate with at least one UE under control of the controller,

wherein the D2D communication is performed between the UE and another UE by a transmission operation or a reception operation between the UE and the other UE based on the UE pair ID in resources indicated by the resource information, and

wherein the network temporary ID is the same for all D2D connections.

47. The BS of claim 46, wherein the controller assigns a UE index for identifying UEs participating in the D2D communication,

wherein the control channel includes the UE index, and

wherein the D2D communication is performed between the UE and the other UE by the transmission operation or the reception operation according to a role determined based on the UE index.

48. The BS of claim 46, wherein the UE pair ID is an ID pair of a transmission ID and a reception ID for determining a role of the UE for each D2D connection,

wherein the control channel includes one of the transmission ID and the reception ID in the ID pair, and

wherein the D2D communication is performed between the UE and the other UE by the transmission operation or the reception operation according to a role based on the transmission ID or the reception ID included in the control channel.

49. A method for performing Device-to-Device (D2D) communication, the method comprising:

receiving a network temporary IDentifier (ID) of another User Equipment (UE) for D2D communication during D2D connection setup with a Base Station (BS) by a UE;

receiving information about the other UE and resource information for the D2D communication with the other UE on a control channel by the UE, the control channel being masked with a network temporary ID of a UE to play a transmission role or a reception role in the D2D communication; and

performing a transmission operation or a reception operation to or from the other UE based on the network temporary ID used in masking the control channel and the information about the other UE in resources indicated by the resource information by the UE,

wherein the network temporary ID is different for each UE.

50. The method of claim 49, wherein for each D2D connection, a different transmission and reception index is assigned to each UE performing D2D communication through the D2D connection, and

wherein the information about the other UE is transmitted using a transmission and reception index.

51. The method of claim 49, wherein the control channel includes a network temporary ID of a UE to play the other role between the transmission role and the reception role.

52. A method for performing Device-to-Device (D2D) communication, the method comprising:

transmitting a network temporary IDentifier (ID) of another User Equipment (UE) for D2D communication during D2D connection setup with a UE by a Base Station (BS); and

transmitting information about the other UE and resource information for the D2D communication with the other UE on a control channel to the UE by the BS, the control channel being masked with a network temporary ID of a UE to play a transmission role or a reception role in the D2D communication,

wherein the D2D communication is performed between the UE and the other UE by a transmission operation or a reception operation between the UE and the other UE based on the network temporary ID used in masking the control channel and the information about the other UE in resources indicated by the resource information, and

wherein the network temporary ID is different for each UE.

53. The method of claim 52, wherein for each D2D connection, a different transmission and reception index is assigned to each UE performing D2D communication through the D2D connection, and

wherein the information about the other UE is transmitted using a transmission and reception index.

54. The method of claim 52, wherein the control channel includes a network temporary ID of a UE to play the other role between the transmission role and the reception role.

55. A User Equipment (UE) for performing Device-to-Device (D2D) communication, the UE comprising:

a transceiver configured to perform D2D communication with another UE on a direct communication link; and

a controller configured to control reception of a network temporary IDentifier (ID) of the other UE for the D2D communication during D2D connection setup with a Base Station (BS), reception of information about the other UE and resource information for the D2D communication with the other UE on a control channel masked with a network temporary ID of a UE to play a transmission role or a reception role in the D2D communication, and performing of a transmission operation or a reception operation to or from the other UE based on the network temporary ID used in masking the control channel and the information about the other UE in resources indicated by the resource information,

wherein the network temporary ID is different for each UE.

56. The UE of claim 55, wherein, for each D2D connection, a different transmission and reception index is assigned to each UE performing D2D communication through the D2D connection, and

wherein the information about the other UE is transmitted using a transmission and reception index.

57. The UE of claim 55, wherein the control channel includes a network temporary ID of a UE to play the other role between the transmission role and the reception role.

58. A Base Station (BS) for performing Device-to-Device (D2D) communication, the BS comprising:

a controller configured to control transmission of a network temporary IDentifier (ID) of another User Equipment (UE) for D2D communication during D2D connection setup with a UE, and transmission of information about the other UE and resource information for the D2D communication with the other UE on a control channel to the UE, the control channel being masked with a network temporary ID of a UE to play a transmission role or a reception role in the D2D communication; and

a transceiver configured to communicate with at least one UE under control of the controller,

wherein the D2D communication is performed between the UE and the other UE by a transmission operation or a reception operation between the UE and the other UE based on the network temporary ID used in masking the control channel and the information about the other UE in resources indicated by the resource information, and

wherein the network temporary ID is different for each UE.

59. The BS of claim 58, wherein, for each D2D connection, a different transmission and reception index is assigned to each UE performing D2D communication through the D2D connection, and

wherein the information about the other UE is transmitted using a transmission and reception index.

60. The BS of claim 58, wherein the control channel includes a network temporary ID of a UE to play the other role between the transmission role and the reception role.

61. A method for allocating resources for Device-to-Device (D2D) communication, the method comprising:

requesting resources for D2D communication by transmitting a D2D buffer status report or a D2D scheduling request to a Base Station (BS); and

receiving resources for D2D communication from BS,

wherein the resources for D2D communication is received on a control channel in a downlink (DL) subframe corresponding to an uplink (UL) subframe reserved for D2D communication, or on a control channel using control information format for D2D communication, or on a control channel with Cyclic Redundancy Check (CRC) masked using a radio network terminal identifier (RNTI) assigned to a User Equipment (UE) for D2D communication.

62. The method of claim 61, wherein the D2D buffer status report is indicated using a logical channel identifier (LCID) distinct from a LCID which indicates a buffer status report for requesting resources for uplink transmission to the BS.

63. The method of claim 61, wherein the D2D scheduling request is transmitted in Physical Uplink Control Channel (PUCCH) resources reserved or assigned to the UE for transmitting the D2D scheduling request.

64. The method of claim 61, wherein the receiving resources for D2D communication on the control channel with the CRC masked using the RNTI assigned to the UE for D2D communication further comprises:

sending a communication request message indicating interest in D2D communication to the BS, wherein the interest indicates that the UE is interested in D2D communication or in transmission for D2D communication or in reception for D2D communication or in both transmission and reception for D2D communication, and

receiving the RNTI for D2D communication in response to the communication request message from the BS.

65. The method of claim 64, wherein the communication request message indicating the interest in D2D communication is transmitted by the UE in a connected state.

66. The method of claim 64, wherein the communication request message indicating the interest in D2D communication is transmitted by the UE in a connection setup message.

67. The method of claim 61, wherein the receiving resources for D2D communication on the control channel with the CRC masked using the RNTI assigned to the UE for D2D communication further comprises:

receiving the RNTI for D2D communication transmitted by the BS autonomously, wherein the UE receives the RNTI when it determines that the UE is authorized for D2D communication based on UE context received from mobility management entity (MME) by the BS.

68. The method of claim 61, wherein the DL subframe indicating resources for D2D communication is different from a DL subframe indicating resources for UL transmission to the BS.

69. The method of claim 61, wherein the control information format for D2D communication is different from control information format indicating resources for UL transmission to the BS or DL reception from the BS.

70. A method for allocating resources for Device-to-Device (D2D) communication, the method comprising:

receiving a buffer status report or a scheduling request from a User Equipment (UE);

determining whether the buffer status report or the scheduling request is for D2D communication;

allocating resources for D2D communication if the buffer status report or the scheduling request is for D2D communication; and

transmitting the allocated resources for D2D communication to the UE,

wherein the resources for D2D communication is transmitted on a control channel in a downlink (DL) subframe corresponding to an uplink (UL) subframe reserved for D2D communication, or on a control channel using control information format for D2D communication or on a control channel with Cyclic Redundancy Check (CRC) masked using a radio network terminal identifier (RNTI) assigned to a User Equipment (UE) for D2D communication.

71. The method of claim 70, wherein the buffer status report for D2D communication is identified using a logical channel identifier (LCID) distinct from a LCID which identifies a buffer status report for requesting resources for uplink transmission to the BS.

72. The method of claim 70, wherein the scheduling request for D2D communication is received in Physical Uplink Control Channel (PUCCH) resources reserved or assigned to the UE for transmitting the scheduling request for D2D communication.

73. The method of claim 70, wherein the transmitting resources for D2D communication on the control channel with the CRC masked using the RNTI assigned to the UE for D2D communication further comprises:

receiving a communication request message indicating interest in D2D communication from the UE, wherein the interest indicates that the UE is interested in D2D communication or in transmission for D2D communication or in reception for D2D communication or in both transmission and reception for D2D communication, and

transmitting the RNTI for D2D communication in response the communication request message to the UE.

74. The method of claim 73, wherein the communication request message indicating the interest in D2D communication is received from the UE in connected state.

75. The method of claim 73, wherein the communication request message indicating the interest in D2D communication is received from the UE in a connection setup message.

76. The method of claim 70, wherein the transmitting resources for D2D communication on the control channel with the CRC masked using the RNTI assigned to the UE for D2D communication further comprises:

transmitting the RNTI for D2D communication to the UE autonomously when the BS determines that the UE is authorized for D2D communication based on UE context received by BS from mobility management entity (MME).

77. The method of claim 70, wherein the DL subframe indicating resources for D2D communication is different from a DL subframe indicating resources for UL transmission to the BS.

78. The method of claim 70, wherein the control information format for D2D communication is different from control information format indicating resources for UL transmission to BS or DL reception from the BS.

79. A User Equipment (UE) for allocating resources for Device-to-Device (D2D) communication, the UE comprising:

a transceiver configured to perform D2D communication with another UE through a direct communication link; and

a controller configured to control for requesting resources for D2D communication by transmitting a D2D buffer status report or a D2D scheduling request to a Base Station (BS) and for receiving resources for D2D communication from BS,

wherein the resources for D2D communication is received on a control channel in a downlink (DL) subframe corresponding to an uplink (UL) subframe reserved for D2D communication, or on a control channel using control information format for D2D communication, or on a control channel with Cyclic Redundancy Check (CRC) masked using a radio network terminal identifier (RNTI) assigned to a User Equipment (UE) for D2D communication.

80. The UE of claim 79, wherein the D2D buffer status report is indicated using a logical channel identifier (LCID) distinct from a LCID which indicates a buffer status report for requesting resources for uplink transmission to the BS.

81. The UE of claim 79, wherein the D2D scheduling request is transmitted in Physical Uplink Control Channel (PUCCH) resources reserved or assigned to the UE for transmitting the D2D scheduling request.

82. The UE of claim 79, wherein for receiving the resources for D2D communication on the control channel with the CRC masked using the RNTI assigned to the UE for D2D communication, the controller is configured to control for sending a communication request message indicating interest in D2D communication to the BS, wherein the interest indicates that the UE is interested in D2D communication or in transmission for D2D communication or in reception for D2D communication or in both transmission and reception for D2D communication, and receiving the RNTI for D2D communication in response to the communication request message from the BS.

83. The UE of claim 82, wherein the communication request message indicating the interest in D2D communication is transmitted in a connected state.

84. The UE of claim 82, wherein the communication request message indicating the interest in D2D communication is transmitted in a connection setup message.

85. The UE of claim 82, wherein for receiving resources for D2D communication on the control channel with the CRC masked using the RNTI assigned to the UE for D2D communication, the controller is configured to receiving the RNTI for D2D communication transmitted by the BS autonomously, wherein the BS sends the RNTI when it determines that the UE is authorized for D2D communication based on UE context received from mobility management entity (MME).

86. The UE of claim 79, wherein the DL subframe indicating resources for D2D communication is different from a DL subframe indicating resources for UL transmission to the BS.

87. The UE of claim 79, wherein the control information format for D2D communication is different from control information format indicating resources for UL transmission to the BS or DL reception from the BS.

88. A Base Station (BS) for allocating resources for Device-to-Device (D2D) communication, the BS comprising:

a controller configured to control for receiving a buffer status report or a scheduling request from a User Equipment (UE), determining whether the buffer status report or the scheduling request is for D2D communication, allocating resources for D2D communication if the buffer status report or the scheduling request is for D2D communication and transmitting the allocated resources for D2D communication to the UE, and

a transceiver configured to perform communication with the UE by controlling of the controller,

wherein the resources for D2D communication is transmitted on a control channel in a downlink (DL) subframe corresponding to an uplink (UL) subframe reserved for D2D communication, or on a control channel using control information format for D2D communication or on a control channel with Cyclic Redundancy Check (CRC) masked using a radio network terminal identifier (RNTI) assigned to the UE for D2D communication.

89. The BS of claim 88, wherein the buffer status report for D2D communication is identified using a logical channel identifier (LCID) distinct from a LCID which identifies a buffer status report for requesting resources for uplink transmission to the BS.

90. The BS of claim 88, wherein the scheduling request for D2D communication is received in Physical Uplink Control Channel (PUCCH) resources reserved or assigned to the UE for transmitting the scheduling request for D2D communication.

91. The BS of claim 88, wherein for transmitting resources for D2D communication on the control channel with the CRC masked using the RNTI assigned to the UE for D2D communication, the controller is configured to control for receiving a communication request message indicating interest in D2D communication from the UE, wherein the interest indicates that the UE is interested in D2D communication or in transmission for D2D communication or in reception for D2D communication or in both transmission and reception for D2D communication and transmitting the RNTI for D2D communication in response the communication request message to the UE.

92. The BS of claim 91, wherein the communication request message indicating the interest in D2D communication is received from the UE in connected state.

93. The BS of claim 91, wherein the communication request message indicating the interest in D2D communication is received from the UE in a connection setup message.

94. The BS of claim 88, wherein for transmitting resources for D2D communication on the control channel with the CRC masked using the RNTI assigned to the UE for D2D communication, the controller is configured to transmit the RNTI for D2D communication to the UE autonomously on determining that the UE is authorized for D2D communication based on UE context received from mobility management entity (MME).

95. The BS of claim 88, wherein the DL subframe indicating resources D2D communication is different from a DL subframe indicating resources for UL transmission to the BS.

96. The BS of claim 88, wherein the control information format for D2D communication is different from control information format indicating resources for UL transmission to the BS or DL reception from the BS.