Downlink control signaling for uplink transmission in a wireless network
A wireless device receives a downlink control information (DCI) indicating uplink resources in m subframes of a licensed assisted access (LAA) cell. The DCI comprises: a resource blocks (RBs) field; a modulation and coding scheme (MCS) field; and a redundancy versions (RV) field and a new data indicators (NDI) field for each of the m subframes. The wireless device transmits, in each of the m subframes, one or more transport blocks employing the RBs field and the MCS field across the m subframes and employing each RV field and each NDI field corresponding to each subframe.
1. A method comprising:
receiving a downlink control information (DCI) indicating uplink resources in m subframes of a licensed assisted access (LAA) cell and comprising a plurality of fields, the plurality of fields comprising:
a number of subframes field indicating m;
a resource blocks (RBs) field;
a modulation and coding scheme (MCS) field;
a transmit power control (TPC) field; and
a listen before talk (LBT) field indicating timing information for performing an LBT procedure;
performing the LBT procedure for transmission in the m subframes employing the timing information indicated by the LBT field; and
transmitting, in each of the m subframes, one or more transport blocks employing the RBs field and the MCS field; and
wherein a transmission power of each of the one or more transport blocks in each subframe in the m subframes is:
determined based on a same closed loop adjustment factor and the TPC field; and
adjusted in each subframe of the m subframes when a total calculated transmit power for each subframe of the m subframes exceeds a power value in each subframe of the m subframes.
2. The method of claim 1 , wherein the transmission power of each of the one or more transport blocks is calculated for each subframe of the m subframes based on a pathloss value for each subframe of the m subframes.
3. The method of claim 1 , wherein the receiving the DCI comprises:
receiving a first DCI via a wireless device specific search space of a first control channel; and
receiving a second DCI via a common search space of a second control channel of the LAA cell.
4. The method of claim 1 , wherein the DCI comprises a cyclic shift field applicable to the m subframes, the cyclic shift employed for transmitting a demodulation reference signal.
5. The method of claim 1 , wherein the DCI comprises a hybrid automatic repeat request (HARQ) identifier.
6. The method of claim 1 , wherein a calculation of the transmission power employs a measured pathloss value.
7. The method of claim 1 , wherein a calculation of the closed loop adjustment factor employs a transmit power control command in the TPC field.
8. The method of claim 1 , wherein the LBT procedure indicates that a channel is clear when a detected channel energy is below a threshold.
9. The method of claim 1 , wherein each subframe in the m subframes is associated with a different hybrid automatic repeat request (HARQ) process identifier.
10. The method of claim 1 , wherein the plurality of fields further comprise a redundancy version (RV) field for each of the m subframes.
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 a downlink control information (DCI) indicating uplink resources in m subframes of a licensed assisted access (LAA) cell and comprising a plurality of fields, the plurality of fields comprising:
a number of subframes field indicating m;
a resource blocks (RBs) field;
a modulation and coding scheme (MCS) field;
a transmit power control (TPC) field; and
a listen before talk (LBT) field indicating timing information for performing an LBT procedure;
perform the LBT procedure for transmission in the m subframes employing the timing information indicated by the LBT field; and
transmit, in each of the m subframes, one or more transport blocks employing the RBs field and the MCS field; and
wherein a transmission power of each of the one or more transport blocks in each subframe in the m subframes is:
determined based on a same closed loop adjustment factor and the TPC field; and
adjusted in each subframe of the m subframes when a total calculated transmit power for each subframe of the m subframes exceeds a power value in each subframe of the m subframes.
12. The wireless device of claim 11 , wherein the transmission power of each of the one or more transport blocks is calculated for each subframe of the m subframes based on a pathloss value for each subframe of the m subframes.
13. The wireless device of claim 11 , wherein the receiving the at DCI comprises:
receiving a first DCI via a wireless device specific search space of a first control channel; and
receiving a second DCI via a common search space of a second control channel of the LAA cell.
14. The wireless device of claim 11 , wherein the DCI comprises a cyclic shift field applicable to the m subframes, the cyclic shift employed for transmitting a demodulation reference signal.
15. The wireless device of claim 11 , wherein the DCI comprises a hybrid automatic repeat request (HARQ) identifier.
16. The wireless device of claim 11 , wherein a calculation of the transmission power employs a measured pathloss value.
17. The wireless device of claim 11 , wherein a calculation of the closed loop adjustment factor employs a transmit power control command in the TPC field.
18. The wireless device of claim 11 , wherein the listen before talk procedure indicates that a channel is clear when a detected channel energy is below a threshold.
19. The wireless device of claim 11 , wherein each subframe in the m subframes is associated with a different hybrid automatic repeat request (HARQ) process identifier.
20. The wireless device of claim 11 , wherein the plurality of fields further comprise a redundancy version (RV) field for each of the m subframes.