Control channel configuration
A wireless device may receive radio resource control (RRC) messaging comprising a field indicating a starting symbol for a physical downlink control channel (PDCCH). The wireless device may monitor for at least one PDCCH candidate. A PDCCH candidate may start based on a listen-before-talk (LBT) procedure, the starting symbol, and the offset value.
1. A method comprising:
receiving, by a wireless device, and via radio resource control (RRC) messaging:
a first field indicating a starting symbol for a physical downlink control channel (PDCCH); and
a second field indicating a non-zero offset symbol value for downlink transmission; and
performing PDCCH monitoring starting, in a time duration, based on:
a listen-before-talk (LBT) procedure;
the starting symbol indicated in the RRC messaging; and
the non-zero offset symbol value indicated in the RRC messaging.
2. The method of claim 1 further comprising:
receiving, via the PDCCH and during the PDCCH monitoring, a signal; and
transmitting, via radio resources indicated by the signal, an uplink transport block.
3. The method of claim 1 further comprising:
receiving, via the PDCCH and during the PDCCH monitoring, a signal; and
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 LBT procedure is associated with a base station.
6. The method of claim 1 , wherein the RRC messaging comprises one or more parameters indicating resource blocks (RBs) for the PDCCH.
7. The method of claim 6 , wherein the one or more parameters indicate one or two sets of RB pairs.
8. The method of claim 7 , wherein the first field indicating the starting symbol applies to the one or two sets of RB pairs.
9. The method of claim 6 , wherein the one or more parameters comprise:
a first parameter indicating a quantity of RB pairs; and
a second parameter indicating an index that indicates RB assignment.
10. The method of claim 1 , wherein the RRC messaging comprises a parameter indicating one or more possible starting positions of transmission in the time duration, and wherein the method further comprises determining, based on the parameter, the non-zero offset symbol value.
11. The method of claim 1 , further comprising:
receiving, during the time duration and via a physical downlink shared channel (PDSCH), a signal, wherein the PDSCH starts, in the time duration, from the starting symbol indicated in the RRC messaging plus the non-zero offset symbol value; and
determining, based on the starting symbol, a PDSCH starting symbol in the time duration.
12. The method of claim 1 , further comprising determining, based on a reference signal, that the PDCCH is received via a partial subframe.
13. The method of claim 1 , wherein the non-zero offset symbol value is seven.
14. The method of claim 1 , wherein the RRC messaging comprises one or more configuration parameters of a licensed assisted access (LAA) cell.
15. The method of claim 1 , further comprising receiving, via a physical downlink shared channel (PDSCH) and using a downlink grant received via the PDCCH, one or more downlink transport blocks.
16. 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, via radio resource control (RRC) messaging:
a first field indicating a starting symbol for a physical downlink control channel (PDCCH); and
a second field indicating a non-zero offset symbol value for downlink transmission; and
perform PDCCH monitoring starting, in a time duration, based on:
a listen-before-talk (LBT) procedure;
the starting symbol indicated in the RRC messaging; and
the non-zero offset symbol value indicated in the RRC messaging.
17. The wireless device of claim 16 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
receive, via the PDCCH and during the PDCCH monitoring, a signal; and
transmit, via radio resources indicated by the signal, an uplink transport block.
18. The wireless device of claim 16 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:
receive, via the PDCCH and during the PDCCH monitoring, a signal; and
receive, via radio resources indicated by the signal, a downlink transport block.
19. The wireless device of claim 16 , wherein the time duration is a subframe.
20. The wireless device of claim 16 , wherein the LBT procedure is associated with a base station.
21. The wireless device of claim 16 , wherein the RRC messaging comprises one or more parameters indicating resource blocks (RBs) for the PDCCH.
22. The wireless device of claim 21 , wherein the one or more parameters indicate one or two sets of RB pairs.
23. The wireless device of claim 22 , wherein the first field indicating the starting symbol applies to the one or two sets of RB pairs.
24. The wireless device of claim 21 , wherein the one or more parameters comprise:
a first parameter indicating a quantity of RB pairs; and
a second parameter indicating an index that indicates RB assignment.
25. The wireless device of claim 16 , wherein:
the RRC messaging comprises a parameter indicating one or more possible starting positions of transmission in the time duration; and
the instructions, when executed by the one or more processors, further cause the wireless device to determine, based on the parameter, the non-zero offset symbol value.
26. The wireless device of claim 16 , 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 signal, wherein the PDSCH starts, in the time duration, from the starting symbol indicated in the RRC messaging plus the non-zero offset symbol value; and
determine, based on the starting symbol, a PDSCH starting symbol in the time duration.
27. The wireless device of claim 16 , 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 PDCCH is received via a partial subframe.
28. The wireless device of claim 16 , wherein the non-zero offset symbol value is seven.
29. The wireless device of claim 16 , wherein the RRC messaging comprises one or more configuration parameters of a licensed assisted access (LAA) cell.
30. The wireless device of claim 16 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to receive, via a physical downlink shared channel (PDSCH) and using a downlink grant received via the PDCCH, one or more downlink transport blocks.
31. A system comprising:
a base station; and
a wireless device;
wherein the base station is configured to transmit via radio resource control (RRC) messaging:
a first field indicating a starting symbol for a physical downlink control channel (PDCCH); and
a second field indicating a non-zero offset symbol value for downlink transmission; and
wherein the wireless device is configured to perform PDCCH monitoring starting, in a time duration, based on:
a listen-before-talk (LBT) procedure;
the starting symbol indicated in the RRC messaging; and
the non-zero offset symbol value indicated in the RRC messaging.
32. The system of claim 31 , wherein the wireless device is further configured to:
receive, via the PDCCH and during the PDCCH monitoring, a signal; and
transmit, via radio resources indicated by the signal, an uplink transport block.
33. The system of claim 31 , wherein the wireless device is further configured to:
receive, via the PDCCH and during the PDCCH monitoring, a signal; and
receive, via radio resources indicated by the signal, a downlink transport block.
34. The system of claim 31 , wherein the time duration is a subframe.
35. The system of claim 31 , wherein the LBT procedure is associated with the base station.
36. The system of claim 31 , wherein the RRC messaging comprises one or more parameters indicating resource blocks (RBs) for the PDCCH.
37. The system of claim 36 , wherein the one or more parameters indicate one or two sets of RB pairs.
38. The system of claim 37 , wherein the first field indicating the starting symbol applies to the one or two sets of RB pairs.
39. The system of claim 36 , wherein the one or more parameters comprise:
a first parameter indicating a quantity of RB pairs; and
a second parameter indicating an index that indicates RB assignment.
40. The system of claim 31 , wherein:
the RRC messaging comprises a parameter indicating one or more possible starting positions of transmission in the time duration; and
the wireless device is further configured to determine, based on the parameter, the non-zero offset symbol value.
41. The system of claim 31 , wherein the wireless device is further configured to:
receive, during the time duration and via a physical downlink shared channel (PDSCH), a signal, wherein the PDSCH starts, in the time duration, from the starting symbol indicated in the RRC messaging plus the non-zero offset symbol value; and
determine, based on the starting symbol, a PDSCH starting symbol in the time duration.
42. The system of claim 31 , wherein the wireless device is further configured to determine, based on a reference signal, that the PDCCH is received via a partial subframe.
43. The system of claim 31 , wherein the non-zero offset symbol value is seven.
44. The system of claim 31 , wherein the RRC messaging comprises one or more configuration parameters of a licensed assisted access (LAA) cell.
45. The system of claim 31 , wherein the wireless device is further configured to receive, via a physical downlink shared channel (PDSCH) and using a downlink grant received via the PDCCH, one or more downlink transport blocks.
46. A non-transitory computer-readable medium comprising instructions that, when executed, configure a wireless device to:
receive, via radio resource control (RRC) messaging:
a first field indicating a starting symbol for a physical downlink control channel (PDCCH); and
a second field indicating a non-zero offset symbol value for downlink transmission; and
perform PDCCH monitoring starting, in a time duration, based on:
a listen-before-talk (LBT) procedure;
the starting symbol indicated in the RRC messaging; and
the non-zero offset symbol value indicated in the RRC messaging.
47. The non-transitory computer-readable medium of claim 46 , wherein the instructions, when executed, further configure the wireless device to:
receive, via the PDCCH and during the PDCCH monitoring, a signal; and
transmit, via radio resources indicated by the signal, an uplink transport block.
48. The non-transitory computer-readable medium of claim 46 , wherein the instructions, when executed, further configure the wireless device to:
receive, via the PDCCH and during the PDCCH monitoring, a signal; and
receive, via radio resources indicated by the signal, a downlink transport block.
49. The non-transitory computer-readable medium of claim 46 , wherein the time duration is a subframe.
50. The non-transitory computer-readable medium of claim 46 , wherein the LBT procedure is associated with a base station.
51. The non-transitory computer-readable medium of claim 46 , wherein the RRC messaging comprises one or more parameters indicating resource blocks (RBs) for the PDCCH.
52. The non-transitory computer-readable medium of claim 51 , wherein the one or more parameters indicate one or two sets of RB pairs.
53. The non-transitory computer-readable medium of claim 52 , wherein the first field indicating the starting symbol applies to the one or two sets of RB pairs.
54. The non-transitory computer-readable medium of claim 51 , wherein the one or more parameters comprise:
a first parameter indicating a quantity of RB pairs; and
a second parameter indicating an index that indicates RB assignment.
55. The non-transitory computer-readable medium of claim 46 , wherein:
the RRC messaging comprises a parameter indicating one or more possible starting positions of transmission in the time duration; and
the instructions, when executed, further configure the wireless device to determine, based on the parameter, the non-zero offset symbol value.
56. The non-transitory computer-readable medium of claim 46 , wherein the instructions, when executed, further configure the wireless device to:
receive, during the time duration and via a physical downlink shared channel (PDSCH), a signal, wherein the PDSCH starts, in the time duration, from the starting symbol indicated in the RRC messaging plus the non-zero offset symbol value; and
determine, based on the starting symbol, a PDSCH starting symbol in the time duration.
57. The non-transitory computer-readable medium of claim 46 , wherein the instructions, when executed, further configure the wireless device to determine, based on a reference signal, that the PDCCH is received via a partial subframe.
58. The non-transitory computer-readable medium of claim 46 , wherein the non-zero offset symbol value is seven.
59. The non-transitory computer-readable medium of claim 46 , wherein the RRC messaging comprises one or more configuration parameters of a licensed assisted access (LAA) cell.
60. The non-transitory computer-readable medium of claim 46 , wherein the instructions, when executed, further configure the wireless device to receive, via a physical downlink shared channel (PDSCH) and using a downlink grant received via the PDCCH, one or more downlink transport blocks.