Initiating uplink transmission in non-terrestrial networks
A wireless device receives, from a satellite, a system information block comprising one or more configuration parameters indicating: a first time for determining transmission of an uplink signal via a cell, and a second time when the cell stops serving an area that the wireless device is located. Based on the configuration parameters, the wireless device does not transmit, via the cell, the uplink signal between the first time and the second time.
1 . 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, from a first satellite, a system information block comprising one or more configuration parameters indicating:
a first time for determining transmission of uplink signals via a cell;
a second time when the cell stops serving an area that the wireless device is located; and
ephemeris information of the first satellite, wherein the first satellite is a serving satellite;
transmit, to the first satellite via the cell, a first uplink signal using a timing advance value, wherein the timing advance value is determined using the ephemeris information of the first satellite;
switch, after the first time, a service link from the first satellite to a second satellite;
and
not transmit, via the cell, an uplink signal between the first time and the second time.
2 . The wireless device of claim 1 , wherein the wireless device is global navigation satellite system (GNSS) capable.
3 . The wireless device of claim 1 , wherein the cell is a non-terrestrial network (NTN) cell.
4 . The wireless device of claim 1 , wherein the first satellite forwards the system information block from an NTN gateway to the wireless device.
5 . The wireless device of claim 1 , wherein the second satellite is the serving satellite after switching the service link.
6 . The wireless device of claim 1 , wherein the uplink signal comprises a request message for uplink radio resources.
7 . The wireless device of claim 1 , wherein the uplink signal is transmitted via physical uplink control channel (PUCCH).
8 . The wireless device of claim 1 , wherein the ephemeris information of the first satellite indicates at least one of:
a position of the first satellite;
or a velocity of the first
satellite.
9 . A method comprising:
receiving, by a wireless device from a first satellite, a system information block comprising one or more configuration parameters indicating:
a first time for determining transmission of uplink signals via a cell;
a second time when the cell stops serving an area that the wireless device is located; and
ephemeris information of the first satellite, wherein the first satellite is a serving satellite;
transmitting, by the wireless device to the first satellite and via the cell, a first uplink signal using a timing advance value, wherein the timing advance value is determined using the ephemeris information of the first satellite;
switching, by the wireless device and after the first time, a service link from the first satellite to a second satellite; and
not transmitting, by the wireless device and via the cell, an uplink signal between the first time and the second time.
10 . The method of claim 9 , wherein the wireless device is global navigation satellite system (GNSS) capable.
11 . The method of claim 9 , wherein the cell is a non-terrestrial network (NTN) cell.
12 . The method of claim 9 , wherein the first satellite forwards the system information block from an NTN gateway to the wireless device.
13 . The method of claim 9 , wherein the second satellite is the serving satellite after the switching the serving link.
14 . The method of claim 9 , wherein the uplink signal comprises a request message for uplink radio resources.
15 . The method of claim 9 , wherein the uplink signal is transmitted via physical uplink control channel (PUCCH).
16 . The method of claim 9 , wherein the ephemeris information of the first satellite indicates at least one of:
a position of the first satellite;
or a velocity of the first
satellite.
17 . A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:
receive, from a first satellite, a system information block comprising one or more configuration parameters indicating:
a first time for determining transmission of uplink signals via a cell;
a second time when the cell stops serving an area that the wireless device is located;
and
ephemeris information of the first satellite, wherein the first satellite is a serving satellite;
transmit, to the first satellite via the cell, a first uplink signal using a timing advance value, wherein the timing advance value is determined using ephemeris information of the first satellite;
switch, after the first time, a service link from the first satellite to a second satellite; and
not transmit, via the cell, an uplink signal between the first time and the second time.
18 . The non-transitory computer-readable medium of claim 17 , wherein the cell is a non-terrestrial network (NTN) cell.
19 . The non-transitory computer-readable medium of claim 17 , wherein the first satellite forwards the system information block from an NTN gateway to the wireless device.
20 . The non-transitory computer-readable medium of claim 17 , wherein the ephemeris information of the first satellite indicates at least one of:
a position of the first
satellite; or a velocity of
the first satellite.