Multi-device synchronization and data transmission
First user equipment (UE) exchanges at least a portion of data to be transmitted to a communication network with a second UE on a side channel. The UEs then send the data to the network at increased transmission power by using transmit antennas of both the first and second UEs, instead of just those of the first UE. In some cases, the second UE may transmit a variation of the data sent by the first UE to perform transmit diversity and improve signal-to-noise ratio. To avoid unintended beamforming of the transmissions, the network may mix signals (e.g., having a same symbol) received at the same time period but at different sub-carriers, or mix the signals received at different time periods but at the same sub-carrier. The network may notify the UEs of a phase correction value based on the signals, and the UEs may adjust using the phase correction value.
1. User equipment, comprising:
a transmitter;
a receiver; and
processing circuitry communicatively coupled to the transmitter and the receiver, the processing circuitry configured to
exchange, on a side channel, data with additional user equipment to be transmitted to a communication hub;
send, using the transmitter on a first channel, an indication to the communication hub that the data is ready to be sent;
receive, using the receiver on the first channel, a grant from the communication hub to send the data;
send, on the side channel, an additional indication to the additional user equipment that the grant from the communication hub is received, wherein the additional indication is configured to cause the additional user equipment to send the data to the communication hub on a second channel; and
send, using the transmitter on the first channel, the data to the communication hub.
2. The user equipment of claim 1 , wherein the processing circuitry is configured to initiate exchange of the data with the additional user equipment on the side channel.
3. The user equipment of claim 1 , wherein the processing circuitry is configured to send, using the transmitter on the first channel, the data to the communication hub by sending, using the transmitter, a first portion of the data to the communication hub on the first channel at a first time and a negative complex conjugate of a second portion of the data to the communication hub on the first channel at a second time.
4. The user equipment of claim 3 , wherein the additional user equipment is configured to send the second portion of the data to the communication hub on the second channel at the first time and a complex conjugate of the first portion of the data to the communication hub on the second channel at the second time.
5. The user equipment of claim 1 , wherein the communication hub is configured to extract the data using space-time orthogonal block decoding.
6. The user equipment of claim 1 , wherein the processing circuitry is configured to send the data to the communication hub by sending, using the transmitter, a first portion of the data to the communication hub on the first channel while the additional user equipment is configured to send a second portion of the data to the communication hub on the second channel.
7. The user equipment of claim 1 , wherein the communication hub is configured to extract the data using a maximum likelihood technique, a zero forcing technique, a minimum mean-square error technique, a successive interference cancellation technique, an ordered successive interference cancellation technique, or any combination thereof.
8. The user equipment of claim 1 , wherein the grant comprises one or more indexes for the user equipment, and wherein the processing circuitry is configured to adjust a demodulation reference signal pattern to synchronize the user equipment and the additional user equipment based on the one or more indexes.
9. A method comprising:
exchanging, on a sidelink, data with user equipment to be transmitted to a communication hub;
transmitting, using a transmitter on a first channel, an indication to the communication hub that the data is ready to be sent;
receiving, using a receiver on the first channel, a grant from the communication hub to send the data;
transmitting, on the sidelink, an additional indication to the user equipment that the grant from the communication hub is received, wherein the additional indication is configured to cause the user equipment to transmit the data to the communication hub on a second channel; and
transmitting, using the transmitter on the first channel, the data to the communication hub.
10. The method of claim 9 , comprising initiating exchange of the data with the user equipment.
11. The method of claim 10 , wherein initiating the exchange of the data with the user equipment is performed via the sidelink.
12. The method of claim 9 , wherein transmitting, using the transmitter on the first channel, the data to the communication hub comprises transmitting a first portion of the data to the communication hub at a first time and a negative complex conjugate of a second portion of the data to the communication hub at a second time.
13. The method of claim 9 , wherein transmitting, using the transmitter on the first channel, the data to the communication hub comprises transmitting the data to the communication hub by transmitting a first portion of the data to the communication hub while the user equipment is configured to transmit a second portion of the data to the communication hub.
14. One or more non-transitory, tangible, computer-readable media storing instructions that cause processing circuitry to:
exchange, on a sidelink, data with user equipment to be transmitted to a communication hub;
receive an indication of a grant to exchange the data;
send, on the sidelink, an additional indication to the user equipment that the grant from the communication hub is received, wherein the additional indication causes the user equipment to transmit the data to the communication hub without using the sidelink; and
transmit, without using the sidelink, the data to the communication hub.
15. The one or more non-transitory, tangible, computer-readable media of claim 14 , wherein the instructions cause the processing circuitry to initiate exchange of the data with the user equipment on the sidelink.
16. The one or more non-transitory, tangible, computer-readable media of claim 15 , wherein the sidelink comprises a device-to-device or peer-to-peer communication protocol.
17. The one or more non-transitory, tangible, computer-readable media of claim 14 , wherein the indication of the grant to exchange the data is received from the user equipment on the sidelink.
18. The one or more non-transitory, tangible, computer-readable media of claim 14 , wherein the indication of the grant to exchange the data is received from the communication hub without using the sidelink.
19. The one or more non-transitory, tangible, computer-readable media of claim 14 , wherein the user equipment is configured to indicate that the data is ready to be transmitted.
20. The one or more non-transitory, tangible, computer-readable media of claim 14 , wherein the communication hub comprises a base station, high altitude base station, a satellite, a ground station, or an access point.