Ephemeris data signaling-delta over time
According to some embodiments, a method performed by a wireless device comprises: receiving a broadcast of full ephemeris data for a serving cell satellite, the broadcast of full ephemeris data occurring at a first periodicity; determining a position of the serving cell satellite based on the full ephemeris data; receiving a broadcast of delta ephemeris data for the serving cell satellite, the broadcast of delta ephemeris data occurring at a second periodicity more frequent than the first periodicity; and determining a position of the serving cell satellite based on the full ephemeris data and the delta ephemeris data.
1 . A method performed by a wireless device, the method comprising:
receiving a broadcast of full ephemeris data for a serving cell satellite, the broadcast of full ephemeris data occurring at a first periodicity;
determining a position of the serving cell satellite based on the full ephemeris data;
receiving a broadcast of delta ephemeris data for the serving cell satellite, the broadcast of delta ephemeris data occurring at a second periodicity more frequent than the first periodicity; and
determining a position of the serving cell satellite based on the full ephemeris data and the delta ephemeris data.
2 . The method of claim 1 , wherein the delta ephemeris data comprises a delta based on the full ephemeris data.
3 . The method of claim 1 , wherein the delta ephemeris data is cumulative based on a previous delta ephemeris data.
4 . The method of claim 1 , wherein the full ephemeris data and the delta ephemeris data are received via system information.
5 . The method of claim 1 , wherein the first periodicity of the full ephemeris data is increased in time leading up to and until just after a cell switch.
6 . The method of claim 1 , further comprising transmitting a request to receive full ephemeris data or delta ephemeris data.
7 . The method of claim 6 , wherein the request is transmitted over a random access channel (RACH).
8 . The method of claim 1 , wherein the ephemeris data is based on a coordinate system with an origin close to a trajectory of the serving cell satellite.
9 . A wireless device comprising processing circuitry operable to:
receive a broadcast of full ephemeris data for a serving cell satellite, the broadcast of full ephemeris data occurring at a first periodicity;
determine a position of the serving cell satellite based on the full ephemeris data;
receive a broadcast of delta ephemeris data for the serving cell satellite, the broadcast of delta ephemeris data occurring at a second periodicity more frequent than the first periodicity; and
determine a position of the serving cell satellite based on the full ephemeris data and the delta ephemeris data.
10 . The wireless device of claim 9 , wherein the delta ephemeris data comprises a delta based on the full ephemeris data.
11 . The wireless device of claim 9 , wherein the delta ephemeris data is cumulative based on a previous delta ephemeris data.
12 . The wireless device of claim 9 , wherein the full ephemeris data and the delta ephemeris data are received via system information.
13 . The wireless device of claim 9 , wherein the first periodicity of the full ephemeris data is increased in time leading up to and until just after a cell switch.
14 . The wireless device of claim 9 , the processing circuitry further operable to transmit a request to receive full ephemeris data or delta ephemeris data.
15 . The wireless device of claim 14 , wherein the request is transmitted over a random access channel (RACH).
16 . The wireless device of claim 9 , wherein the ephemeris data is based on a coordinate system with an origin close to a trajectory of the serving cell satellite.
17 . A method performed by a network node, the method comprising:
transmitting a broadcast of full ephemeris data for a serving cell satellite, the broadcast of full ephemeris data occurring at a first periodicity; and
transmitting a broadcast of delta ephemeris data for the serving cell satellite, the broadcast of delta ephemeris data occurring at a second periodicity more frequent than the first periodicity.
18 . A network node comprising processing circuitry operable to:
transmit a broadcast of full ephemeris data for a serving cell satellite, the broadcast of full ephemeris data occurring at a first periodicity; and
transmit a broadcast of delta ephemeris data for the serving cell satellite, the broadcast of delta ephemeris data occurring at a second periodicity more frequent than the first periodicity.
19 . The network node of claim 18 , wherein the delta ephemeris data comprises a delta based on the full ephemeris data.
20 . The network node of claim 18 , wherein the delta ephemeris data is cumulative based on a previous delta ephemeris data.
21 . The network node of claim 18 , wherein the full ephemeris data and the delta ephemeris data are transmitted via system information.
22 . The network node of claim 18 , wherein the first periodicity of the full ephemeris data is increased in time leading up to and until just after a cell switch.
23 . The network node of claim 18 , the processing circuitry further operable to receive a request to transmit full ephemeris data or delta ephemeris data.
24 . The network node of claim 23 , wherein the request is received over a random access channel (RACH).
25 . The network node of claim 18 , wherein the ephemeris data is based on a coordinate system with an origin close to a trajectory of the serving cell satellite.