Methods and apparatus for mobility in moving networks
A method and apparatus for receiving a broadcast configuration indicating when a change in a RAN function termination occurs is provided, for example, by a timer value. The broadcast configuration may be received from a satellite, blimp or other moving transmitter. A dedicated configuration may also be received from the serving cell. The dedicated configuration may include a preamble, a transient configuration and an indication of a layer 2 behavior. If a WTRU detects a change in RAN function termination, the WTRU may suspend any uplink data transmissions, apply the transient configuration and transmit the preamble to a target cell. The WTRU may synchronize with the target cell and apply the layer 2 behavior.
1. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
receiving, from a non-terrestrial network node, radio resource control (RRC) reconfiguration information, including a trigger condition to trigger an RRC reconfiguration at a future time instance, wherein the trigger condition includes the future time instance, the future time instance including a time offset; and
when the trigger condition is satisfied, executing the RRC reconfiguration;
wherein the future time instance uses coordinated universal time (UTC).
2. The method of claim 1 , wherein the trigger condition further includes one or more measurement-based trigger conditions.
3. The method of claim 1 , wherein the future time instance is associated with satellite mobility.
4. The method of claim 1 , wherein the time offset is a counter.
5. The method of claim 4 , wherein the counter indicates a number of time units after the time instance, after which the trigger condition is not satisfied.
6. The method of claim 1 , wherein the time offset is a time offset from the future time instance.
7. The method of claim 1 , wherein the executing the RRC reconfiguration includes executing a handover to a target cell.
8. A wireless transmit/receive unit (WTRU), comprising:
a transceiver; and
a processor;
wherein the transceiver and processor are configured to:
receive, from a non-terrestrial network node, radio resource control (RRC) reconfiguration information, including a trigger condition to trigger an RRC reconfiguration at a future time instance, wherein the trigger condition includes the future time instance, the future time instance including a time offset; and
when the trigger condition is satisfied, executing the RRC reconfiguration;
wherein the future time instance uses coordinated universal time (UTC).
9. The WTRU of claim 8 , wherein the trigger condition further includes one or more measurement-based trigger conditions.
10. The WTRU of claim 8 , wherein the future time instance is associated with satellite mobility.
11. The WTRU of claim 8 , wherein the time offset is a counter.
12. The WTRU of claim 11 , wherein the counter indicates a number of time units until a satellite mobility event.
13. The WTRU of claim 8 , wherein the time offset is a time offset from the future time instance.
14. The WTRU of claim 8 , wherein the executing the RRC reconfiguration includes executing a handover to a target cell.