Control channel configuration

1. A method comprising:

receiving, by a wireless device, at least one radio resource control (RRC) message comprising:

a first parameter indicating a starting symbol for an enhanced physical downlink control channel (ePDCCH); and

a second parameter indicating one or more possible starting positions of transmission in a time duration; and

receiving, via the ePDCCH, a signal, wherein the ePDCCH starts from the starting symbol plus a non-zero offset symbol value that is based on the second parameter.

2. The method of claim 1 , further comprising transmitting, via radio resources indicated by the signal, an uplink transport block.

3. The method of claim 1 , further comprising receiving, via radio resources indicated by the signal, a downlink transport block.

4. The method of claim 1 , wherein the time duration is a subframe.

5. The method of claim 1 , wherein the at least one RRC message further comprises one or more parameters indicating resource blocks (RBs) for the ePDCCH.

6. The method of claim 5 , wherein the one or more parameters indicate one or two sets of RB pairs.

7. The method of claim 6 , wherein the first parameter indicating the starting symbol applies to the one or two sets of RB pairs.

8. The method of claim 5 , wherein the one or more parameters comprise:

a parameter indicating a quantity of RB pairs; and

a parameter indicating an index that indicates RB assignment.

9. The method of claim 1 , further comprising determining, based on the second parameter, the non-zero offset symbol value.

10. The method of claim 1 , further comprising:

receiving, during the time duration and via a physical downlink shared channel (PDSCH), a second signal, wherein the PDSCH starts, in the time duration, from the starting symbol indicated in the at least one RRC message plus a non-zero offset symbol value; and

determining, based on the starting symbol, a PDSCH starting symbol in the time duration.

11. The method of claim 1 , further comprising determining, based on a reference signal, that the ePDCCH is received via a partial subframe.

12. The method of claim 1 , wherein the non-zero offset symbol value is seven.

13. The method of claim 1 , wherein the at least one RRC message further comprises one or more configuration parameters of a licensed assisted access (LAA) cell.

14. The method of claim 1 , further comprising receiving, via a PDSCH and using a downlink grant received via the ePDCCH, one or more downlink transport blocks.

15. A method comprising:

transmitting, by a base station, at least one radio resource control (RRC) message comprising:

a first parameter indicating a starting symbol for an enhanced physical downlink control channel (ePDCCH); and

a second parameter indicating one or more possible starting positions of transmission in a time duration; and

transmitting, via the ePDCCH, a signal, wherein the ePDCCH starts from the starting symbol plus a non-zero offset symbol value that is based on the second parameter.

16. The method of claim 15 , further comprising receiving, via radio resources indicated by the signal, an uplink transport block.

17. The method of claim 15 , further comprising transmitting, via radio resources indicated by the signal, a downlink transport block.

18. The method of claim 15 , wherein the time duration is a subframe.

19. The method of claim 15 , wherein the at least one RRC message further comprises one or more parameters indicating resource blocks (RBs) for the ePDCCH.

20. The method of claim 19 , wherein the one or more parameters indicate one or two sets of RB pairs.

21. The method of claim 20 , wherein the first parameter indicating the starting symbol applies to the one or two sets of RB pairs.

22. The method of claim 19 , wherein the one or more parameters comprise:

a parameter indicating a quantity of RB pairs; and

a parameter indicating an index that indicates RB assignment.

23. The method of claim 15 , further comprising:

transmitting, during the time duration and via a physical downlink shared channel (PDSCH), a second signal, wherein the PDSCH starts, in the time duration, from the starting symbol indicated in the at least one RRC message plus a non-zero offset symbol value.

24. The method of claim 15 , wherein the non-zero offset symbol value is seven.

25. The method of claim 15 , wherein the at least one RRC message further comprises one or more configuration parameters of a licensed assisted access (LAA) cell.

26. The method of claim 15 , further comprising transmitting, via a PDSCH and using a downlink grant transmitted via the ePDCCH, one or more downlink transport blocks.

27. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the wireless device to:

receive at least one radio resource control (RRC) message comprising:

a first parameter indicating a starting symbol for an enhanced physical downlink control channel (ePDCCH); and

a second parameter indicating one or more possible starting positions of transmission in a time duration; and

receive, via the ePDCCH, a signal, wherein the ePDCCH starts from the starting symbol plus a non-zero offset symbol value that is based on the second parameter.

28. The wireless device of claim 27 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to transmit, via radio resources indicated by the signal, an uplink transport block.

29. The wireless device of claim 27 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive, via radio resources indicated by the signal, a downlink transport block.

30. The wireless device of claim 27 , wherein the time duration is a subframe.

31. The wireless device of claim 27 , wherein the at least one RRC message further comprises one or more parameters indicating resource blocks (RBs) for the ePDCCH.

32. The wireless device of claim 31 , wherein the one or more parameters indicate one or two sets of RB pairs.

33. The wireless device of claim 32 , wherein the first parameter indicating the starting symbol applies to the one or two sets of RB pairs.

34. The wireless device of claim 31 , where the one or more parameters comprise:

a parameter indicating a quantity of RB pairs; and

a parameter indicating an index that indicates RB assignment.

35. The wireless device of claim 27 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to determine, based on the second parameter, the non-zero offset symbol value.

36. The wireless device of claim 27 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:

receive, during the time duration and via a physical downlink shared channel (PDSCH), a second signal, wherein the PDSCH starts, in the time duration, from the starting symbol indicated in the at least one RRC message plus a non-zero offset symbol value; and

determining, based on the starting symbol, a PDSCH starting symbol in the time duration.

37. The wireless device of claim 27 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to determine, based on a reference signal, that the ePDCCH is received via a partial subframe.

38. The wireless device of claim 27 , wherein the non-zero offset symbol value is seven.

39. The wireless device of claim 27 , wherein the at least one RRC message further comprises one or more configuration parameters of a licensed assisted access (LAA) cell.

40. The wireless device of claim 27 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive, via a PDSCH and using a downlink grant received via the ePDCCH, one or more downlink transport blocks.

41. A base station comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the base station to:

transmit at least one radio resource control (RRC) message comprising:

a first parameter indicating a starting symbol for an enhanced physical downlink control channel (ePDCCH); and

a second parameter indicating one or more possible starting positions of transmission in a time duration; and

transmit, via the ePDCCH, a signal, wherein the ePDCCH starts from the starting symbol plus a non-zero offset symbol value that is based on the second parameter.

42. The base station of claim 41 , wherein the instructions, when executed by the one or more processors, further cause the base station to receive, via radio resources indicated by the signal, an uplink transport block.

43. The base station of claim 41 , wherein the instructions, when executed by the one or more processors, further cause the base station to transmit, via radio resources indicated by the signal, a downlink transport block.

44. The base station of claim 41 , wherein the time duration is a subframe.

45. The base station of claim 41 , wherein the at least one RRC message further comprises one or more parameters indicating resource blocks (RBs) for the ePDCCH.

46. The base station of claim 45 , wherein the one or more parameters indicate one or two sets of RB pairs.

47. The base station of claim 46 , wherein the first parameter indicating the starting symbol applies to the one or two sets of RB pairs.

48. The base station of claim 45 , wherein the one or more parameters comprise:

a parameter indicating a quantity of RB pairs; and

a parameter indicating an index that indicates RB assignment.

49. The base station of claim 41 , wherein the instructions, when executed by the one or more processors, further cause the base station to transmit during the time duration and via a physical downlink shared channel (PDSCH), a second signal, wherein the PDSCH starts, in the time duration, from the starting symbol indicated in the at least one RRC message plus a non-zero offset symbol value.

50. The base station of claim 41 , wherein the non-zero offset symbol value is seven.

51. The base station of claim 41 , wherein the at least one RRC message further comprises one or more configuration parameters of a licensed assisted access (LAA) cell.

52. The base station of claim 41 , wherein the instructions, when executed by the one or more processors, further cause the base station to transmit via a PDSCH and using a downlink grant transmitted via the ePDCCH, one or more downlink transport blocks.

53. The method of claim 1 , wherein the second parameter is for a partial subframe.

54. The method of claim 1 , wherein the non-zero offset symbol value is a starting symbol value of at least one of a partial subframe or a slot boundary.

55. The method of claim 15 , wherein the second parameter is for a partial subframe.

56. The method of claim 15 , wherein the non-zero offset symbol value is a starting symbol value of at least one of a partial subframe or a slot boundary.

57. The wireless device of claim 27 , wherein the second parameter is for a partial subframe.

58. The wireless device of claim 27 , wherein the non-zero offset symbol value is a starting symbol value of at least one of a partial subframe or a slot boundary.

59. The base station of claim 41 , wherein the second parameter is for a partial subframe.

60. The base station of claim 41 , wherein the non-zero offset symbol value is a starting symbol value of at least one of a partial subframe or a slot boundary.

61. A system comprising:

a base station; and

a wireless device;

wherein the base station is configured to transmit at least one radio resource control (RRC) message comprising:

a first parameter indicating a starting symbol for an enhanced physical downlink control channel (ePDCCH); and

a second parameter indicating one or more possible starting positions of transmission in a time duration; and

wherein the wireless device is configured to receive, via the ePDCCH, a signal, wherein the ePDCCH starts from the starting symbol plus a non-zero offset symbol value that is based on the second parameter.

62. The system of claim 61 , wherein the wireless device is further configured to transmit, via radio resources indicated by the signal, an uplink transport block.

63. The system of claim 61 , wherein the base station is further configured to transmit, via radio resources indicated by the signal, a downlink transport block.

64. The system of claim 61 , wherein the time duration is a subframe.

65. The system of claim 61 , wherein the at least one RRC message further comprises one or more parameters indicating resource blocks (RBs) for the ePDCCH.

66. The system of claim 65 , wherein the one or more parameters indicate one or two sets of RB pairs.

67. The system of claim 66 , wherein the first parameter indicating the starting symbol applies to the one or two sets of RB pairs.

68. The system of claim 65 , wherein the one or more parameters comprise:

a parameter indicating a quantity of RB pairs; and

a parameter indicating an index that indicates RB assignment.

69. The system of claim 61 , wherein the wireless device is further configured to determine, based on the second parameter, the non-zero offset symbol value.

70. The system of claim 61 , wherein:

the base station is further configured to transmit, during the time duration and via a physical downlink shared channel (PDSCH), a second signal, wherein the PDSCH starts, in the time duration, from the starting symbol indicated in the at least one RRC message plus a non-zero offset symbol value; and

the wireless is further configured to determine, based on the starting symbol, a PDSCH starting symbol in the time duration.

71. The system of claim 61 , wherein the wireless device is further configured to determine, based on a reference signal, that the ePDCCH is received via a partial subframe.

72. The system of claim 61 , wherein the non-zero offset symbol value is seven.

73. The system of claim 61 , wherein the at least one RRC message further comprises one or more configuration parameters of a licensed assisted access (LAA) cell.

74. The system of claim 61 , wherein the wireless device is further configured to receive, via a PDSCH and using a downlink grant received via the ePDCCH, one or more downlink transport blocks.

75. The system of claim 61 , wherein the base station is further configured to transmit, during the time duration and via a physical downlink shared channel (PDSCH), a second signal, wherein the PDSCH starts, in the time duration, from the starting symbol indicated in the at least one RRC message plus a non-zero offset symbol value.

76. The system of claim 61 , wherein the base station is further configured to transmit, via a PDSCH and using a downlink grant transmitted in the ePDCCH, one or more downlink transport blocks.

77. The system of claim 61 , wherein the second parameter is for a partial subframe.

78. The system of claim 61 , wherein the non-zero offset symbol value is a starting symbol value of at least one of a partial subframe or a slot boundary.