Feeder link in data transport in wireless telecommunication systems
Systems, methods, apparatuses, and computer program products for feeder link data transport are provided. For example, baseband in-phase and quadrature (IQ) data may be processed at the transmitter and receiver of the feeder link. The orthogonal frequency division multiplexing (OFDM) waveform used in a beam may be modified for transmission over the feeder link. For example, the waveform may have a wider subcarrier spacing (SCS) and may fill an enlarged bandwidth than otherwise with a feeder link.
1. An apparatus, comprising:
at least one processor; and
at least one memory including computer program code,
wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to:
transmit, on a feeder link, a stream of symbols multiplexed in series,
wherein the stream of multiplexed symbols is ordered and is formed from one or more parallel streams of symbols represented by time-domain samples corresponding to one or more beams,
wherein a sample rate of the stream of multiplexed symbols is greater than a sum of sample rates of the one or more parallel streams of symbols,
wherein a duration of symbols of the stream of multiplexed symbols is shorter than a duration of symbols of the one or more parallel streams of symbols; and
transmit, between sets of symbols of the stream of multiplexed symbols, one or more reference signals.
2. The apparatus according to claim 1 , wherein the apparatus comprises at least one of:
a gateway station,
a high altitude platform station, or
a satellite.
3. The apparatus according to claim 1 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the apparatus, when transmitting the one or more reference signals, at least to:
transmit the one or more reference signals, wherein a quantity of symbols in the sets of symbols is equal to a multiple of a quantity of the one or more parallel streams of symbols.
4. The apparatus according to claim 1 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the apparatus at least to:
multiplex the one or more parallel streams of symbols to form the stream of multiplexed symbols.
5. The apparatus according to claim 4 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the apparatus, when multiplexing the one or more parallel streams of symbols, at least to:
multiplex the one or more parallel streams of symbols in an order of beam indexes of the one or more beams.
6. The apparatus according to claim 1 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the apparatus, when transmitting the stream of multiplexed symbols, at least to:
transmit the stream of multiplexed symbols to another network node, wherein the other network node comprises at least one of:
a gateway station,
a high altitude platform station, or
a satellite.
7. The apparatus according to claim 1 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the apparatus at least to:
transmit information on a management link.
8. The apparatus according to claim 7 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, when transmitting the information, at least to:
transmit, on the management link, the information, wherein the information comprises at least one of:
a quantity of the one or more beams,
a sample rate of the stream of multiplexed symbols,
a number of samples in a symbol of the stream of multiplexed symbols,
a beam index order of the one or more beams, or
sample rates of the one or more parallel streams.
9. The apparatus according to claim 7 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, when transmitting the information, at least to:
transmit, on the management link, the information, wherein the information comprises, for configuring the one or more reference signals, at least one of:
a type of the one or more reference signals,
a timing of the one or more reference signals, or
a periodicity of the one or more reference signals.
10. An apparatus, comprising:
at least one processor; and
at least one memory including computer program code,
wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to:
receive, on a feeder link, a stream of symbols multiplexed in series,
wherein the stream of multiplexed symbols is ordered and formed from one or more parallel streams of symbols represented by time-domain samples corresponding to one or more beams,
wherein a sample rate of the stream of multiplexed symbols is greater than a sum of sample rates of the one or more parallel streams of symbols,
wherein a duration of symbols of the stream of multiplexed symbols is shorter than a duration of symbols of the one or more parallel streams of symbols; and
receive, between sets of symbols of the stream of multiplexed symbols, one or more reference signals.
11. The apparatus according to claim 10 , wherein the apparatus comprises at least one of:
a gateway station,
a high altitude platform station, or
a satellite.
12. The apparatus according to claim 10 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the apparatus, when receiving of the one or more reference signals, at least to:
receive the one or more reference signals, wherein a quantity of symbols in the sets of symbols is equal to a multiple of a quantity of the one or more parallel streams of symbols.
13. The apparatus according to claim 10 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the apparatus, when receiving of the stream of symbols, at least to:
receive the stream of symbols from another network node, wherein the other network node comprises at least one of:
a gateway station,
a high altitude platform station, or
a satellite.
14. The apparatus according to claim 10 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the apparatus at least to:
receive information on a management link.
15. The apparatus according to claim 14 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, when receiving the information, at least to:
receive the information on the management link, wherein the information comprises at least one of:
a quantity of the one or more beams,
a sample rate of the stream of multiplexed symbols,
a number of samples in a symbol of the stream of multiplexed symbols,
a beam index order of the one or more beams, or
sample rates of the one or more parallel streams.
16. The apparatus according to claim 14 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, when receiving the information, at least to:
receive, on the management link, the information, wherein the information comprises, for configuring the one or more reference signals, at least one of:
a type of the one or more reference signals,
a timing of the one or more reference signals, or
a periodicity of the one or more reference signals.
17. The apparatus according to claim 10 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the apparatus at least to:
determine a sample or symbol timing of the stream of multiplexed symbols based on the one or more reference signals; and
correct frequency or phase errors associated with the stream of multiplexed symbols based on the one or more reference signals.
18. The apparatus according to claim 10 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the apparatus at least to:
demultiplex the stream of multiplexed symbols into the one or more parallel streams of symbols in an order of beam indexes of the one or more beams.
19. The apparatus according to claim 10 , wherein the at least one memory and the computer program code are configured to, with the at least one processor, further cause the apparatus at least to:
process the time-domain samples for the one or more parallel streams of symbols at the sample rates of the one or more parallel streams of symbols.
20. A method, comprising:
transmitting, on a feeder link by a network node, a stream of symbols multiplexed in series,
wherein the stream of multiplexed symbols is formed from one or more parallel streams of symbols represented by time-domain samples corresponding to one or more beams,
wherein a sample rate of the stream of multiplexed symbols is greater than a sum of sample rates of the one or more parallel streams of symbols,
wherein a duration of symbols of the stream of multiplexed symbols is shorter than a duration of symbols of the one or more parallel streams of symbols; and
transmitting, between sets of symbols of the stream of multiplexed symbols, one or more reference signals.