Signal transmissions in one or more subframes in a wireless network
View Patent ↗A wireless device receives downlink control information comprising: an allocation of resource blocks for transmission of uplink data in a first subframe of licensed assisted access (LAA) cell; an index indicating a starting position for the uplink data in the first subframe; and a field indicating an ending symbol for the uplink data. The wireless device transmits the uplink data on the LAA cell, starting at the starting position in the first subframe and ending at the ending symbol.
1. A method comprising:
receiving one or more radio resource control (RRC) messages comprising one or more configuration parameters for a licensed assisted access (LAA) cell, the one or more configuration parameters comprising one or more listen before talk (LBT) configuration parameters;
receiving a downlink control information (DCI) comprising:
an allocation of resource blocks for transmission of uplink data in a subframe;
a first field comprising an index indicating a starting position for the uplink data in the subframe, the index identifying one of a plurality of pre-configured starting positions; and
a second field indicating an ending symbol for the uplink data, the ending symbol being one of a plurality of pre-configured ending symbols;
performing, on the LAA cell and before the starting position of the subframe, an LBT procedure employing the one or more LBT configuration parameters, the LBT procedure indicating a clear channel;
mapping, based at least on the starting position and the ending symbol, the uplink data to resource elements corresponding to the resource blocks allocated for transmission; and
transmitting, the uplink data on the LAA cell, starting at the starting position in the subframe and ending before the ending symbol.
2. The method of claim 1 , wherein the subframe is a starting subframe of a multi-subframe burst.
3. The method of claim 1 , wherein the transmitting the uplink data further comprises:
transmitting a reservation signal until an allowed symbol for a physical uplink shared channel transmission; and
transmitting data symbols starting from the allowed symbol.
4. The method of claim 3 , wherein the reservation signal duration is less than one symbol.
5. The method of claim 1 , wherein the starting position is based on a value of an uplink timing advance calculated by a wireless device.
6. The method of claim 1 , wherein the DCI comprises an LBT parameter.
7. The method of claim 1 , wherein the DCI comprises a transmit power control (TPC) command.
8. The method of claim 1 , wherein the configuration parameters for the LAA cell comprise uplink transmission parameters.
9. The method of claim 1 , wherein the DCI indicates a starting time for the LBT procedure.
10. The method of claim 1 , wherein a starting time for the LBT procedure is at a pre-determined time before the starting position.
11. 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 one or more radio resource control (RRC) messages comprising one or more configuration parameters for a licensed assisted access (LAA) cell, the one or more configuration parameters comprising one or more listen before talk (LBT) configuration parameters;
receive a downlink control information (DCI) comprising:
an allocation of resource blocks for transmission of uplink data in a subframe;
a first field comprising an index indicating a starting position for the uplink data in the subframe, the index identifying one of a plurality of pre-configured starting positions; and
a second field indicating an ending symbol for the uplink data, the ending symbol being one of a plurality of pre-configured ending symbols;
perform, on the LAA cell and before the starting position of the subframe, an LBT procedure employing the one or more LBT configuration parameters, the LBT procedure indicating a clear channel;
map, based at least on the starting position and the ending symbol, the uplink data to resource elements corresponding to the resource blocks allocated for transmission; and
transmit, the uplink data on the LAA cell, starting at the starting position in the subframe and ending before the ending symbol.
12. The wireless device of claim 11 , wherein the first subframe is a starting subframe of a multi-subframe burst.
13. The wireless device of claim 11 , wherein the transmitting the uplink data further comprises:
transmitting a reservation signal until a first allowed symbol for a physical uplink shared channel transmission; and
transmitting data symbols starting from the first allowed symbol.
14. The wireless device of claim 13 , wherein the reservation signal duration is less than one symbol.
15. The wireless device of claim 11 , wherein the starting position is based on a value of an uplink timing advance calculated by the wireless device.
16. The wireless device of claim 11 , wherein the DCI comprises an LBT parameter.
17. The wireless device of claim 11 , wherein the DCI comprises a transmit power control (TPC) command.
18. The wireless device of claim 11 , wherein the configuration parameters for the LAA cell comprise uplink transmission parameters.
19. The wireless device of claim 11 , wherein the DCI indicates a starting time for the LBT procedure.
20. The wireless device of claim 11 , wherein a starting time for the LBT procedure is at a pre-determined time before the starting position.