Timing advance determination in wireless networks

1. A wireless communication method, comprising:

receiving, by a first device, from a second device, a message comprising one or more fields that include information indicative of a communication delay between the first device and the second device,

wherein the one or more fields includes a first timing advance amount which is based on a location of the first device and the second device; and

processing the message by:

determining, by the first device, a second timing advance amount based on a reception of a random-access preamble from the second device; and

determining, by the first device, a third timing advance amount by combining the first timing advance amount and the second timing advance amount,

wherein a complete timing advance amount includes the third timing advance amount.

2. The method of claim 1 ,

wherein the one or more fields includes a time information received by the first device via a second message using a physical uplink shared channel (PUSCH) scheduled by a first message, wherein the first message precedes the second message, and

wherein the first device scrambles control information of the first message using a random-access preamble index and transmits the first message to the second device.

3. The method of claim 1 , wherein the one or more fields includes a time information associated with transmission or reception by the second device at a specific time during a random access procedure.

4. The method of claim 1 ,

wherein the one or more fields includes one or more parameters to determine a time information associated with transmission or reception by the second device at a specific time during a random access procedure, and

wherein the one or more parameters includes index information at the specific time corresponding to any one or more of a radio frame, a subframe, a time slot, and a symbol, and

wherein the time information associated with transmission or reception by the second device is determined by:

determining, using the one or more parameters, a transmission time information associated with a time when the second device sends a second message using a physical uplink shared channel (PUSCH), or

determining, using the one or more parameters, a reception time information associated with a time when the second device receives a first message that precedes the second message.

5. The method of claim 1 , wherein the one or more fields includes a location information of the second device, and

wherein the method further comprises:

determining, by the first device, a timing advance amount based on the location information of the second device.

6. The method of claim 1 , wherein the first device is included in a satellite that orbits earth.

7. A wireless communication method, comprising:

transmitting, by a second device, to a first device, a message comprising one or more fields that include information indicative of a communication delay between the second device and the first device,

wherein the one or more fields includes a first timing advance amount which is based on a location of the first device and the second device; and

transmitting, by the second device, a random-access preamble to the first device,

wherein a second timing advance amount is based on a reception of the random-access preamble at the first device,

wherein a third timing advance amount is a combination of the first timing advance amount and the second timing advance amount, and

wherein a complete timing advance amount includes the third timing advance amount.

8. The method of claim 7 ,

wherein the one or more fields includes a time information received by the first device via a second message transmitted by the second device using a physical uplink shared channel (PUSCH) scheduled by a first message, wherein the first message precedes the second message, or

wherein the one or more fields includes a time information transmitted by the second device during a random access procedure, or

wherein the one or more fields includes a time information from a traffic channel bearer after completion of the random access procedure.

9. The method of claim 7 , wherein the one or more fields includes a time information associated with transmission or reception by the second device at a specific time during a random access procedure.

10. The method of claim 7 ,

wherein the one or more fields includes one or more parameters to determine a time information associated with transmission or reception by the second device at a specific time during a random access procedure, and

wherein the one or more parameters includes index information at the specific time corresponding to any one or more of a radio frame, a subframe, a time slot, and a symbol.

11. A first device for wireless communication comprising a processor, configured to implement a method comprising:

receive, from a second device, a message comprising one or more fields that include information indicative of a communication delay between the first device and the second device,

wherein the one or more fields includes a first timing advance amount which is based on a location of the first device and the second device; and

process the message by the processor configured to:

determine, by the first device, a second timing advance amount based on a reception of a random-access preamble from the second device; and

determine, by the first device, a third timing advance amount by combining the first timing advance amount and the second timing advance amount,

wherein a complete timing advance amount includes the third timing advance amount.

12. The first device of claim 11 ,

wherein the one or more fields includes a time information received by the first device via a second message using a physical uplink shared channel (PUSCH) scheduled by a first message, wherein the first message precedes the second message, and

wherein the processor of the first device is configured to scramble control information of the first message using a random-access preamble index and transmits the first message to the second device.

13. The first device of claim 11 , wherein the one or more fields includes a time information associated with transmission or reception by the second device at a specific time during a random access procedure.

14. The first device of claim 11 ,

wherein the one or more fields includes one or more parameters to determine a time information associated with transmission or reception by the second device at a specific time during a random access procedure, and

wherein the one or more parameters includes index information at the specific time corresponding to any one or more of a radio frame, a subframe, a time slot, and a symbol, and

wherein the time information associated with transmission or reception by the second device is determined by the processor further configured to:

determine, using the one or more parameters, a transmission time information associated with a time when the second device sends a second message using a physical uplink shared channel (PUSCH), or

determine, using the one or more parameters, a reception time information associated with a time when the second device receives a first message that precedes the second message.

15. A second device for wireless communication comprising a processor, configured to implement a method comprising:

transmit, to a first device, a message comprising one or more fields that include information indicative of a communication delay between the second device and the first device,

wherein the one or more fields includes a first timing advance amount which is based on a location of the first device and the second device; and

transmit a random-access preamble to the first device,

wherein a second timing advance amount is based on a reception of the random-access preamble at the first device,

wherein a third timing advance amount is a combination of the first timing advance amount and the second timing advance amount, and

wherein a complete timing advance amount includes the third timing advance amount.

16. The second device of claim 15 ,

wherein the one or more fields includes a time information received by the first device via a second message configured to be transmitted by the second device using a physical uplink shared channel (PUSCH) scheduled by a first message, wherein the first message precedes the second message, or

wherein the one or more fields includes a time information configured to be transmitted by the second device during a random access procedure, or

wherein the one or more fields includes a time information from a traffic channel bearer after completion of the random access procedure.

17. The second device of claim 15 ,

wherein the one or more fields includes one or more parameters to determine a time information associated with transmission or reception by the second device at a specific time during a random access procedure, and

wherein the one or more parameters includes index information at the specific time corresponding to any one or more of a radio frame, a subframe, a time slot, and a symbol.

18. A system, comprising:

a second device configured to:

transmit to a first device, a message comprising one or more fields that include information indicative of a communication delay between the second device and the first device; and

the first device is configured to:

receive the message sent by the second device,

wherein the one or more fields includes a first timing advance amount which is based on a location of the first device and the second device; and

process the message by the first device configured to:

determine a second timing advance amount based on a reception of a random-access preamble from the second device; and

determine a third timing advance amount by combining the first timing advance amount and the second timing advance amount,

wherein a complete timing advance amount includes the third timing advance amount.

19. The system of claim 18 ,

wherein the one or more fields includes one or more parameters to determine a time information associated with transmission or reception by the second device at a specific time during a random access procedure, and

wherein the one or more parameters includes index information at the specific time corresponding to any one or more of a radio frame, a subframe, a time slot, and a symbol, and

wherein the time information associated with transmission or reception by the second device is determined by the first device further configured to:

determine, using the one or more parameters, a transmission time information associated with a time when the second device sends a second message using a physical uplink shared channel (PUSCH), or

determine, using the one or more parameters, a reception time information associated with a time when the second device receives a first message that precedes the second message.

20. The system of claim 18 ,

wherein the one or more fields includes one or more parameters to determine a time information associated with transmission or reception by the second device at a specific time during a random access procedure, and

wherein the one or more parameters includes index information at the specific time corresponding to any one or more of a radio frame, a subframe, a time slot, and a symbol.