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, wherein a cell associated with the second cell type is configured to be without a common reference signal in at least one downlink transmission time interval that does not have a packet, wherein an uplink carrier of the cell associated with the second cell type is configured to operate without uplink random access channel resources, and wherein the common reference signal is for wireless devices that are configured to receive signals via the cell associated with the second cell type; 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 cell associated with the first cell type, control information of the cell associated with the second cell type.
2 . The method of claim 1 , further comprising:
receiving, via a downlink channel of the cell associated with the first cell type, control information comprising scheduling information for transmission of at least one packet, wherein the scheduling information is associated with the cell associated with the second cell type; and
communicating, based on the scheduling information and via the cell associated with the second cell type, the at least one packet.
3 . The method of claim 1 , wherein the 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 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 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 cell associated with the first cell type.
7 . The method of claim 1 , wherein the cell associated with the second cell type is configured to have, in at least one second downlink transmission time interval, the 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.
8 . 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, wherein a cell associated with the second cell type selectively comprises a common reference signal in at least one downlink transmission time interval based on data being transmitted in the at least one downlink transmission time interval, wherein an uplink carrier of the cell associated with the second cell type is configured to operate without uplink random access channel resources, and wherein the common reference signal is for wireless devices that are configured to receive signals via the cell associated with the second cell type; 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 cell associated with the first cell type, control information of the cell associated with the second cell type.
9 . The method of claim 8 , further comprising:
receiving, via a downlink channel of the cell associated with the first cell type, control information comprising scheduling information for transmission of at least one packet, wherein the scheduling information is associated with the cell associated with the second cell type; and
communicating, based on the scheduling information and via the cell associated with the second cell type, the at least one packet.
10 . The method of claim 8 , wherein the 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.
11 . The method of claim 10 , 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.
12 . The method of claim 8 , wherein the 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.
13 . The method of claim 8 , wherein the 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 cell associated with the first cell type.
14 . The method of claim 8 , wherein the cell associated with the second cell type is configured to have, in at least one second downlink transmission time interval, the 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.
15 . A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, configure 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, wherein a cell associated with the second cell type is configured to be without a common reference signal in at least one downlink transmission time interval that does not have a packet, wherein an uplink carrier of the cell associated with the second cell type is configured to operate without uplink random access channel resources, and wherein the common reference signal is for wireless devices that are configured to receive signals via the cell associated with the second cell type; 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 cell associated with the first cell type, control information of the cell associated with the second cell type.
16 . The wireless device of claim 15 , wherein the instructions, when executed by the one or more processors, further configure the wireless device to:
receive, via a downlink channel of the cell associated with the first cell type, control information comprising scheduling information for transmission of at least one packet, wherein the scheduling information is associated with the cell associated with the second cell type; and
communicate, based on the scheduling information and via the cell associated with the second cell type, the at least one packet.
17 . The wireless device of claim 15 , wherein the 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.
18 . The wireless device of claim 17 , 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.
19 . The wireless device of claim 15 , wherein the 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.
20 . The wireless device of claim 15 , wherein the 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 cell associated with the first cell type.
21 . The wireless device of claim 15 , wherein the cell associated with the second cell type is configured to have, in at least one second downlink transmission time interval, the 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.
22 . A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, configure 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, wherein a cell associated with the second cell type selectively comprises a common reference signal in at least one downlink transmission time interval based on data being transmitted in the at least one downlink transmission time interval, wherein an uplink carrier of the cell associated with the second cell type is configured to operate without uplink random access channel resources, and wherein the common reference signal is for wireless devices that are configured to receive signals via the cell associated with the second cell type; 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 cell associated with the first cell type, control information of the cell associated with the second cell type.
23 . The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, further configure the wireless device to:
receive, via a downlink channel of the cell associated with the first cell type, control information comprising scheduling information for transmission of at least one packet, wherein the scheduling information is associated with the cell associated with the second cell type; and
communicate, based on the scheduling information and via the cell associated with the second cell type, the at least one packet.
24 . The wireless device of claim 22 , wherein the 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.
25 . The wireless device of claim 24 , 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.
26 . The wireless device of claim 22 , wherein the 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.
27 . The wireless device of claim 22 , wherein the 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 cell associated with the first cell type.
28 . The wireless device of claim 22 , wherein the cell associated with the second cell type is configured to have, in at least one second downlink transmission time interval, the 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.