Downlink and uplink channel transmission and monitoring in a wireless network
A wireless device may receive one or more radio resource control (RRC) messages comprising configuration parameters for one or more unlicensed cells. The wireless device may selectively monitor a downlink physical control channel (PDCCH) on one of the unlicensed cells, depending on whether there is an uplink transmission or downlink transmission on another unlicensed cell.
1. A method comprising:
receiving, by a wireless device, radio resource control (RRC) messaging comprising configuration parameters for a first cell in an unlicensed spectrum and a second cell in the unlicensed spectrum;
receiving a downlink transmission via the second cell; and
based on the downlink transmission via the second cell, selectively monitoring a physical downlink control channel (PDCCH) during a time duration for the first cell.
2. The method of claim 1 , wherein the downlink transmission is a physical downlink shared channel (PDSCH) transmission.
3. The method of claim 1 , wherein the PDCCH is an enhanced PDCCH.
4. The method of claim 1 , wherein the first cell and the second cell belong to a cell group.
5. The method of claim 4 , wherein the cell group comprises a plurality of cells that operate in a same frequency band of the unlicensed spectrum.
6. The method of claim 4 , wherein the RRC messaging further comprises one or more configuration parameters of the cell group.
7. The method of claim 1 , wherein the time duration is a subframe.
8. The method of claim 1 , wherein receiving the downlink transmission comprises receiving the downlink transmission during a partial downlink subframe or a full downlink subframe.
9. The method of claim 1 , wherein the first cell and the second cell operate according to frame structure Type 3 .
10. The method of claim 1 , further comprising based on a downlink transmission not occurring during a second time duration for the second cell, monitoring the PDCCH during a time duration for the first cell.
11. The method of claim 1 , wherein the RRC messaging indicates a cell grouping at the wireless device.
12. The method of claim 1 , wherein the RRC messaging indicates a cell group index of a cell group comprising the first cell and the second cell.
13. The method of claim 1 , wherein the selectively monitoring comprises:
monitoring the PDCCH based on a first condition; and
skipping monitoring of the PDCCH based on a second condition.
14. The method of claim 13 , wherein:
the first condition comprises no uplink transmission during the time duration; and
the second condition comprises an uplink transmission during the time duration.
15. 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 resource control (RRC) messaging comprising configuration parameters for a first cell in an unlicensed spectrum and a second cell in the unlicensed spectrum;
receive a downlink transmission via the second cell; and
based on the downlink transmission via the second cell, selectively monitor a physical downlink control channel (PDCCH) during a time duration for the first cell.
16. The wireless device of claim 15 , wherein the downlink transmission is a physical downlink shared channel (PDSCH) transmission.
17. The wireless device of claim 15 , wherein the PDCCH is an enhanced PDCCH.
18. The wireless device of claim 15 , wherein the first cell and the second cell belong to a cell group.
19. The wireless device of claim 18 , wherein the cell group comprises a plurality of cells that operate in a same frequency band of the unlicensed spectrum.
20. The wireless device of claim 18 , wherein the RRC messaging further comprises one or more configuration parameters of the cell group.
21. The wireless device of claim 15 , wherein the time duration is a subframe.
22. The wireless device of claim 15 , wherein the instructions, when executed, cause the wireless device to receive the downlink transmission at least by receiving the downlink transmission during a partial downlink subframe or a full downlink subframe.
23. The wireless device of claim 15 , wherein the first cell and the second cell operate according to frame structure Type 3 .
24. The wireless device of claim 15 , wherein the instructions, when executed, further cause the wireless device to, based on a downlink transmission not occurring during a second time duration for the second cell, monitor the PDCCH during a time duration for the first cell.
25. The wireless device of claim 15 , wherein the RRC messaging indicates a cell grouping at the wireless device.
26. The wireless device of claim 15 , wherein the RRC messaging indicates a cell group index of a cell group comprising the first cell and the second cell.
27. The wireless device of claim 15 , wherein the instructions, when executed, cause the wireless device to selectively monitor the PDCCH at least by:
monitoring the PDCCH based on a first condition; and
skipping monitoring of the PDCCH based on a second condition.
28. The wireless device of claim 27 , wherein:
the first condition comprises no uplink transmission during the time duration; and
the second condition comprises an uplink transmission during the time duration.
29. A non-transitory computer-readable medium storing instructions that, when executed configure a wireless device to:
receive radio resource control (RRC) messaging comprising configuration parameters for a first cell in an unlicensed spectrum and a second cell in the unlicensed spectrum;
receive a downlink transmission via the second cell; and
based on the downlink transmission via the second cell, selectively monitor a physical downlink control channel (PDCCH) during a time duration for the first cell.
30. The non-transitory computer-readable medium of claim 29 , wherein the downlink transmission is a physical downlink shared channel (PDSCH) transmission.
31. The non-transitory computer-readable medium of claim 29 , wherein the PDCCH is an enhanced PDCCH.
32. The non-transitory computer-readable medium of claim 29 , wherein the first cell and the second cell belong to a cell group.
33. The non-transitory computer-readable medium of claim 32 , wherein the cell group comprises a plurality of cells that operate in a same frequency band of the unlicensed spectrum.
34. The non-transitory computer-readable medium of claim 32 , wherein the RRC messaging further comprises one or more configuration parameters of the cell group.
35. The non-transitory computer-readable medium of claim 29 , wherein the time duration is a subframe.
36. The non-transitory computer-readable medium of claim 29 , wherein the instructions, when executed, configure the wireless device to receive the downlink transmission at least by receiving the downlink transmission during a partial downlink subframe of a full downlink subframe.
37. The non-transitory computer-readable medium of claim 29 , wherein the first cell and the second cell operate according to frame structure Type 3 .
38. The non-transitory computer-readable medium of claim 29 , wherein the instructions, when executed, further configure the wireless device to, based on a downlink transmission not occurring during a second time duration for the second cell, monitor the PDCCH during a time duration for the first cell.
39. The non-transitory computer-readable medium of claim 29 , wherein the RRC messaging indicates a cell grouping at the wireless device.
40. The non-transitory computer-readable medium of claim 29 , wherein the RRC messaging indicates a cell group index of a cell group comprising the first cell and the second cell.
41. The non-transitory computer-readable medium of claim 29 , wherein the instructions, when executed, configure the wireless device to selectively monitor the PDCCH at least by:
monitoring the PDCCH based on a first condition; and
skipping monitoring of the PDCCH based on a second condition.
42. The non-transitory computer-readable medium of claim 41 , wherein:
the first condition comprises no uplink transmission during the time duration; and
the second condition comprises an uplink transmission during the time duration.
43. A system comprising:
a base station; and
a wireless device;
wherein the base station is configured to transmit radio resource control (RRC) messaging comprising configuration parameters for a first cell in an unlicensed spectrum and a second cell in the unlicensed spectrum; and
wherein the wireless device is configured to:
receive a downlink transmission via the second cell; and
based on the downlink transmission via the second cell, selectively monitor a physical downlink control channel (PDCCH) during a time duration for the first cell.
44. The system of claim 43 , wherein the downlink transmission is a physical downlink shared channel (PDSCH) transmission.
45. The system of claim 43 , wherein the PDCCH is an enhanced PDCCH.
46. The system of claim 43 , wherein the first cell and the second cell belong to a cell group.
47. The system of claim 46 , wherein the cell group comprises a plurality of cells that operate in a same frequency band of the unlicensed spectrum.
48. The system of claim 46 , wherein the RRC messaging further comprises one or more configuration parameters of the cell group.
49. The system of claim 43 , wherein the time duration is a subframe.
50. The system of claim 43 , wherein the wireless device is configured to receive the downlink transmission at least by receiving the downlink transmission during a partial downlink subframe or a full downlink subframe.
51. The system of claim 43 , wherein the first cell and the second cell operate according to frame structure Type 3 .
52. The system of claim 43 , wherein the wireless device is further configured to, based on a downlink transmission not occurring during a second time duration for the second cell, monitor the PDCCH during a time duration for the first cell.
53. The system of claim 43 , wherein the RRC messaging indicates a cell grouping at the wireless device.
54. The system of claim 43 , wherein the RRC messaging indicates a cell group index of a cell group comprising the first cell and the second cell.
55. The system of claim 43 , wherein the wireless device is further configured to:
monitor the PDCCH based on a first condition; and
skip monitoring of the PDCCH based on a second condition.
56. The system of claim 55 , wherein:
the first condition comprises no uplink transmission during the time duration; and
the second condition comprises an uplink transmission during the time duration.