Carrier information transmission to wireless devices
Methods, apparatuses, and systems for wireless communications are described. A base station may send a message with configuration parameters to a wireless device, and the configuration parameters may be for at least two different types of carriers used for communications.
1. A method comprising:
receiving, by a wireless device and from a base station:
one or more configuration parameters for a plurality of cells, wherein each of the plurality of cells is associated with a first cell type or a second cell type, and wherein cells associated with the second cell type are configured to be without a common reference signal in downlink transmission time intervals that do not have a packet; and
information indicating whether each cell of the plurality of cells is associated with the first cell type or the second cell type; and
transmitting, via an uplink channel of a first cell associated with the first cell type, control information of a second cell associated with the second cell type.
2. The method of claim 1 , further comprising skipping receipt of a common reference signal in the downlink transmission time intervals.
3. The method of claim 1 , wherein the second cell associated with the second cell type comprises a second downlink transmission time interval in which a control channel is configured to start at a symbol after a first symbol in the second downlink transmission time interval.
4. The method of claim 3 , wherein the first symbol in the second downlink transmission time interval is transmitted at a power level lower than a power level associated with transmission of one or more other symbols in the second downlink transmission time interval.
5. The method of claim 1 , wherein the first cell associated with the first cell type comprises:
a plurality of transmission time intervals; and
a downlink reference signal in every transmission time interval of the plurality of transmission time intervals.
6. The method of claim 1 , wherein the second cell associated with the second cell type comprises synchronization signals located at a transmission time interval location that is different from a transmission time interval location of synchronization signals in the first cell associated with the first cell type.
7. The method of claim 1 , further comprising receiving, from the base station, one or more messages comprising:
information indicating a location of primary synchronization signals in one or more transmission time intervals of the second cell associated with the second cell type; and
information indicating a location of secondary synchronization signals in one or more transmission time intervals of the second cell associated with the second cell type.
8. The method of claim 1 , wherein each of the downlink transmission time intervals comprises a subframe.
9. The method of claim 1 , wherein the transmitting the control information comprises transmitting, based on a downlink transmission via the second cell in one or more second downlink transmission time intervals, the control information.
10. The method of claim 1 , wherein the cells associated with the second cell type selectively do not have a common reference signal in the downlink transmission time intervals based on the downlink transmission time intervals not having a packet.
11. The method of claim 1 , wherein the cells associated with the second cell type are configured to have, in at least one second downlink transmission time interval, a common reference signal, a channel state information (CSI) reference signal, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH) signal, and a demodulation reference signal.
12. The method of claim 1 , wherein cells associated with the first cell type are configured to have a common reference signal in every downlink subframe.
13. 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, from a base station:
one or more configuration parameters for a plurality of cells, wherein each of the plurality of cells is associated with a first cell type or a second cell type, and wherein cells associated with the second cell type are configured to be without a common reference signal in downlink transmission time intervals that do not have a packet; and
information indicating whether each cell of the plurality of cells is associated with the first cell type or the second cell type; and
transmit, via an uplink channel of a first cell associated with the first cell type, control information of a second cell associated with the second cell type.
14. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, cause the wireless device to skip receipt of a common reference signal in the downlink transmission time intervals.
15. The wireless device of claim 13 , wherein the second cell associated with the second cell type comprises a second downlink transmission time interval in which a control channel is configured to start at a symbol after a first symbol in the second downlink transmission time interval.
16. The wireless device of claim 15 , wherein the first symbol in the second downlink transmission time interval is transmitted at a power level lower than a power level associated with transmission of one or more other symbols in the second downlink transmission time interval.
17. The wireless device of claim 13 , wherein the first cell associated with the first cell type comprises:
a plurality of transmission time intervals; and
a downlink reference signal in every transmission time interval of the plurality of transmission time intervals.
18. The wireless device of claim 13 , wherein the second cell associated with the second cell type comprises synchronization signals located at a transmission time interval location that is different from a transmission time interval location of synchronization signals in the first cell associated with the first cell type.
19. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, cause the wireless device to receive, from the base station, one or more messages comprising:
information indicating a location of primary synchronization signals in one or more transmission time intervals of the second cell associated with the second cell type; and
information indicating a location of secondary synchronization signals in one or more transmission time intervals of the second cell associated with the second cell type.
20. The wireless device of claim 13 , wherein each of the downlink transmission time intervals comprises a subframe.
21. The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, cause the wireless device to transmit the control information by transmitting, based on a downlink transmission via the second cell in one or more second downlink transmission time intervals, the control information.
22. The wireless device of claim 13 , wherein the cells associated with the second cell type selectively do not have a common reference signal in the downlink transmission time intervals based on the downlink transmission time intervals not having a packet.
23. The wireless device of claim 13 , wherein the cells associated with the second cell type are configured to have, in at least one second downlink transmission time interval, a common reference signal, a channel state information (CSI) reference signal, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH) signal, and a demodulation reference signal.
24. The wireless device of claim 13 , wherein cells associated with the first cell type are configured to have a common reference signal in every downlink subframe.
25. A method comprising:
transmitting, by a base station:
one or more configuration parameters for a plurality of cells, wherein each of the plurality of cells is associated with a first cell type or a second cell type, and wherein cells associated with the second cell type are configured to be without a common reference signal in downlink transmission time intervals that do not have a packet; and
information indicating whether each cell of the plurality of cells is associated with the first cell type or the second cell type; and
receiving, via an uplink channel of a first cell associated with the first cell type, control information of a second cell associated with the second cell type.
26. The method of claim 25 , further comprising skipping transmission of a common reference signal in the downlink transmission time intervals.
27. The method of claim 25 , wherein the second cell associated with the second cell type comprises a second downlink transmission time interval in which a control channel is configured to start at a symbol after a first symbol in the second downlink transmission time interval.
28. The method of claim 27 , wherein the first symbol in the second downlink transmission time interval is transmitted at a power level lower than a power level associated with transmission of one or more other symbols in the second downlink transmission time interval.
29. The method of claim 25 , wherein the first cell associated with the first cell type comprises:
a plurality of transmission time intervals; and
a downlink reference signal in every transmission time interval of the plurality of transmission time intervals.
30. The method of claim 25 , wherein the second cell associated with the second cell type comprises synchronization signals located at a transmission time interval location that is different from a transmission time interval location of synchronization signals in the first cell associated with the first cell type.
31. The method of claim 25 , further comprising transmitting one or more messages comprising:
information indicating a location of primary synchronization signals in one or more transmission time intervals of the second cell associated with the second cell type; and
information indicating a location of secondary synchronization signals in one or more transmission time intervals of the second cell associated with the second cell type.
32. The method of claim 25 , wherein each of the downlink transmission time intervals comprises a subframe.
33. The method of claim 25 , wherein the receiving the control information comprises receiving, based on a downlink transmission via the second cell in one or more second downlink transmission time intervals, the control information.
34. The method of claim 25 , wherein the cells associated with the second cell type selectively do not have a common reference signal in the downlink transmission time intervals based on the downlink transmission time intervals not having a packet.
35. The method of claim 25 , wherein the cells associated with the second cell type are configured to have, in at least one second downlink transmission time interval, a common reference signal, a channel state information (CSI) reference signal, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH) signal, and a demodulation reference signal.
36. The method of claim 25 , wherein cells associated with the first cell type are configured to have a common reference signal in every downlink subframe.
37. 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:
one or more configuration parameters for a plurality of cells, wherein each of the plurality of cells is associated with a first cell type or a second cell type, and wherein cells associated with the second cell type are configured to be without a common reference signal in downlink transmission time intervals that do not have a packet; and
information indicating whether each cell of the plurality of cells is associated with the first cell type or the second cell type; and
receive, via an uplink channel of a first cell associated with the first cell type, control information of a second cell associated with the second cell type.
38. The base station of claim 37 , wherein the instructions, when executed by the one or more processors, cause the base station to skip transmission of a common reference signal in the downlink transmission time intervals.
39. The base station of claim 37 , wherein the second cell associated with the second cell type comprises a second downlink transmission time interval in which a control channel is configured to start at a symbol after a first symbol in the second downlink transmission time interval.
40. The base station of claim 39 , wherein the first symbol in the second downlink transmission time interval is transmitted at a power level lower than a power level associated with transmission of one or more other symbols in the second downlink transmission time interval.
41. The base station of claim 37 , wherein the first cell associated with the first cell type comprises:
a plurality of transmission time intervals; and
a downlink reference signal in every transmission time interval of the plurality of transmission time intervals.
42. The base station of claim 37 , wherein the second cell associated with the second cell type comprises synchronization signals located at a transmission time interval location that is different from a transmission time interval location of synchronization signals in the first cell associated with the first cell type.
43. The base station of claim 37 , wherein the instructions, when executed by the one or more processors, cause the base station to transmit one or more messages comprising:
information indicating a location of primary synchronization signals in one or more transmission time intervals of the second cell associated with the second cell type; and
information indicating a location of secondary synchronization signals in one or more transmission time intervals of the second cell associated with the second cell type.
44. The base station of claim 37 , wherein each of the downlink transmission time intervals comprises a subframe.
45. The base station of claim 37 , wherein the instructions, when executed by the one or more processors, cause the base station to receive the control information by receiving, based on a downlink transmission via the second cell in one or more second downlink transmission time intervals, the control information.
46. The base station of claim 37 , wherein the cells associated with the second cell type selectively do not have a common reference signal in the downlink transmission time intervals based on the downlink transmission time intervals not having a packet.
47. The base station of claim 37 , wherein the cells associated with the second cell type are configured to have, in at least one second downlink transmission time interval, a common reference signal, a channel state information (CSI) reference signal, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH) signal, and a demodulation reference signal.
48. The base station of claim 37 , wherein cells associated with the first cell type are configured to have a common reference signal in every downlink subframe.