Wireless communications apparatus and methods
A method for an infrastructure equipment of a wireless telecommunications network, the wireless telecommunications network comprising a base station and a non-terrestrial network part, the non-terrestrial network part transmitting one or more beams to provide a wireless access interface for transmitting signals to and receiving signals representing data from a communications device within a coverage region of a cell or a spot beam, the method comprising: determining a location of the communications device, determining the coverage region of the cell or the spot beam, determining a relative motion, relative to the communications device, of the coverage region of the cell or the spot beam, and based on the location and the relative motion, initiating a cell change of the communications device.
1. A method for an infrastructure equipment of a wireless telecommunications network, the wireless telecommunications network comprising a base station and a non-terrestrial network part, the non-terrestrial network part transmitting one or more beams to provide a wireless access interface for transmitting signals to and receiving signals representing data from a communications device within a coverage region of a cell or a spot beam, the method comprising:
determining a location of the communications device;
determining the coverage region of the cell or the spot beam;
determining a relative motion, relative to the communications device, of the coverage region of the cell or the spot beam;
based on the location and the relative motion, initiating a cell change of the communications device; and
determining a change in the coverage region of the cell or the spot beam based on a trajectory of the non-terrestrial network part, wherein
the determining the relative motion is based on the change in the coverage region of the cell or the spot beam.
2. The method according to claim 1 , wherein the coverage region of the cell varies over time in accordance with a motion of the non-terrestrial network part with respect to the surface of the Earth.
3. The method according to claim 1 , wherein a trajectory of the non-terrestrial network part is such that the coverage region of the cell or the spot beam is substantially constant over a time period.
4. The method according to claim 1 , wherein the communications device is acting as a relay device for one or more terminal devices, each of the one or more terminal devices being in one of an RRC connected mode, an RRC idle state or an RRC inactive state.
5. The method according to claim 1 , further comprising transmitting to the communications device an indication that the communications device is to change a serving cell of the communications device when the communications device determines that one or more conditions are satisfied.
6. The method according to claim 1 , wherein the infrastructure equipment is the non-terrestrial network part.
7. The method according to claim 1 , wherein the infrastructure equipment is the base station.
8. The method according to claim 1 , wherein the non-terrestrial network part comprises a satellite or an airborne vehicle.
9. The method according to claim 1 , wherein
the communications device is in an RRC connected mode, and
the initiating the cell change of the communications device comprises initiating a handover of the communications device.
10. An infrastructure equipment for use in a wireless telecommunications network, the wireless telecommunications network comprising a base station and a non-terrestrial network part, the non-terrestrial network part transmitting one or more beams to provide a wireless access interface for transmitting signals to and receiving signals representing data from a communications device within a coverage region of a cell, the infrastructure equipment operatively coupled to one or more of the base station and the non-terrestrial network part, the infrastructure equipment comprising:
transceiver circuitry; and
processing circuitry configured to:
determine a location of the communications device;
determine the coverage region of the cell or the spot beam;
determine a relative motion, relative to the communications device, of the coverage region of the cell or the spot beam;
based on the location and the relative motion, initiate a cell change of the communications device; and
determine a change in the coverage region of the cell or the spot beam based on a trajectory of the non-terrestrial network part, wherein
the processing circuitry determines the relative motion based on the change in the coverage region of the cell or the spot beam.
11. The infrastructure equipment according to claim 10 , wherein the infrastructure equipment is the non-terrestrial network part.
12. The infrastructure equipment according to claim 10 , wherein the infrastructure equipment is the base station.