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1. (WO2019045607) METHODS, INTERMEDIATE RADIO UNITS AND RADIO HEADS OF BASE STATION SYSTEMS FOR TRANSMISSION OF ANTENNA CARRIERS
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CLAIMS

1 . A method performed by an intermediate radio unit, IRU (210) of a base station system (200), the base station system comprising the IRU (210), a baseband unit, BBU (230) connected to the IRU (210), and a first radio head, RH, (221 ) connected to the IRU (210) via a packet data network (240), the first RH (221 ) being arranged for wireless transmission in radio frequency, RF, of a plurality of antenna carriers to user equipments, UEs (250), the plurality of antenna carriers being transmitted from the first RH at individually different RFs, the method comprising:

receiving (302), from the BBU (230), a plurality of first digital

representations of the plurality of antenna carriers of the first RH (221 ), each first digital representation representing one antenna carrier, the plurality of first digital representations being received in a baseband frequency range,

frequency multiplexing (304) the plurality of first digital representations of the plurality of antenna carriers into a second digital representation over a first bandwidth; and

transmitting (308) the second digital representation to the first RH (221 ).

2. Method according to claim 1 , wherein in the frequency multiplexing (304), the plurality of antenna carriers are distributed in frequency across the first bandwidth according to their individual RFs for transmission from the first RH (221 ) to the UEs.

3. Method according to claim 1 or 2, further comprising:

performing (305) crest factor reduction, CFR, and digital pre-distortion, DPD, on the second digital representation, before the transmission (308) of the second digital representation to the first RH.

4. Method according to claim 3, further comprising:

receiving (310), from the first RH, a digital TOR signal, the TOR signal being the second digital representation frequency-converted into RF and amplified by the first RH, and

applying (312) the digital TOR signal when performing the DPD.

5. Method according to claim 4, wherein the received digital TOR signal is compressed.

6. Method according to any of the preceding claims, further comprising:

compressing (306) the second digital representation into a compressed second digital representation, and wherein the transmitting (308) comprises transmitting the compressed second digital representation to the first RH.

7. Method according to claim 6, wherein the compressing (306) comprises resampling as well as vector quantization and/or transform coding of the second digital representation.

8. Method according to claim 6 or 7, wherein the compressing (306) comprises a power spectrum density, PSD, dependent compression of the second digital representation.

9. Method according to any of the preceding claims, wherein the first RH (221 ) has a first antenna and a second antenna and a first set of the first digital representations are representations of antenna carriers of the first antenna and a second set of the first digital representations are representations of antenna carriers of the second antenna, and wherein the frequency multiplexing (304) into the second digital representation comprises frequency multiplexing the first set of the first digital representations into a primary second digital representation and frequency multiplexing the second set of the first digital representations into a secondary second digital representation, and wherein the transmitting (308) comprises transmitting the primary second digital representation to the first RH (221 ) and transmitting the secondary second digital representation to the first RH.

10. A method performed by a radio head, RH, (221 ) of a base station system (200), the RH (221 ) being arranged for wireless transmission in radio frequency, RF, of a plurality of antenna carriers to user equipments, UEs (250), the plurality of antenna carriers being transmitted from the RH (221 ) at individually different RFs, the base station system comprising the RH (221 ), an intermediate radio unit, IRU, (210) connected to the RH (221 ) via a packet data network (240), and a baseband unit, BBU, (230) connected to the IRU (210), the method comprising:

receiving (402), from the IRU (210), a second digital representation in a first bandwidth, the second digital representation comprising a plurality of first digital representations of the plurality of antenna carriers, each first digital representation representing one antenna carrier, the plurality of first digital representations of the plurality of antenna carriers being frequency multiplexed into the second digital representation across the first bandwidth,

frequency converting (408) the second digital representation into radio frequency, and

wirelessly transmitting (410) the converted second digital representation to the UEs (250).

1 1 . Method according to claim 10, wherein in the received second digital representation, the plurality of antenna carriers are distributed in frequency along the first bandwidth according to their individual RFs for transmission from the RH (221 ) to the UEs.

12. Method according to any of claims 10 or 1 1 , the RH (221 ) comprising a power amplifier for amplifying the frequency converted second digital

representation, the method further comprises:

sampling and digitizing (412) an output signal from the power amplifier, and

sending (414) the sampled and digitized output signal to the IRU (210) as a digital TOR signal, for use by the IRU when performing DPD.

13. Method according to claim 12, wherein the TOR signal is compressed before it is sent (414) to the IRU.

14. Method according to any of claims 10-13, wherein the received second digital representation is a compressed version of an original version of the second digital representation, the second digital representation being compressed according to a compression scheme, the method further comprising:

de-compressing (406) the received second digital representation according to the compression scheme to obtain a version of the second digital representation corresponding to the original version.

15. Method according to claim 9 or 10, wherein the RH (221 ) has a first antenna and a second antenna, and wherein the received second digital representation comprises a primary second digital representation comprising a first set of the first digital representations that are representations of antenna carriers of the first antenna, the first set of the first digital representations being frequency multiplexed into the primary second digital representation, and a secondary second digital representation comprising a second set of the first digital

representations that are representations of antenna carriers of the second antenna, the second set of the first digital representations being frequency multiplexed into the secondary second digital representation, the method further comprising transporting the primary second digital representation to the first antenna and the secondary second digital representation to the second antenna for wireless transmission from the respective first and second antenna to the UEs.

16. An intermediate radio unit, IRU (210), operable in a base station system (200), the base station system comprising the IRU (210), a baseband unit, BBU (230), connected to the IRU (210), and a first radio head, RH, (221 ) connected to the IRU (210) via a packet data network (240), the first RH (221 ) being arranged for wireless transmission in RF of a plurality of antenna carriers to user

equipments, UEs (250), the plurality of antenna carriers are to be transmitted from the first RH at individually different RFs, the IRU (210) comprising a processor (603) and a memory (604), said memory containing instructions executable by said processor, whereby the IRU (210) is operative for: receiving, from the BBU (230), a plurality of first digital representations of the plurality of antenna carriers of the first RH (221 ), each first digital representation representing one antenna carrier, the plurality of first digital representations being received in a baseband frequency range,

frequency multiplexing the plurality of first digital representations of the plurality of antenna carriers into a second digital representation over a first bandwidth; and

transmitting the second digital representation to the first RH (221 ).

17. IRU (210) according to claim 16, operative for, in the frequency multiplexing, distributing the plurality of antenna carriers in frequency across the first bandwidth according to their individual RFs for transmission from the first RH (221 ) to the UEs.

18. IRU (210) according to claim 16 or 17, further being operative for:

performing digital pre-distortion, DPD, and crest factor reduction, CFR, on the second digital representation, before transmission of the second digital representation to the first RH.

19. IRU (210) according to claim 18, further being operative for:

receiving, from the first RH, a digital TOR signal, the TOR signal being the second digital representation frequency-converted into RF and amplified by the first RH, and;

applying the digital TOR signal when performing the DPD.

20. IRU (210) according to claim 19, further being operative for compressing the received digital TOR signal.

21 . IRU (210) according to any of claims 16-20, further being operative for compressing the second digital representation into a compressed second digital representation, and for transmitting the compressed second digital representation to the first RH.

22. IRU (210) according to any of claims 16-21 , wherein the first RH (221 ) has a first antenna and a second antenna and a first set of the first digital representations are representations of antenna carriers of the first antenna and a second set of the first digital representations are representations of antenna carriers of the second antenna, and wherein IRU is further operative for frequency multiplexing the first set of the first digital representations into a primary second digital representation and frequency multiplexing the second set of the first digital representations into a secondary second digital representation, and for

transmitting the primary second digital representation to the first RH (221 ) and transmitting the secondary second digital representation to the first RH (221 ).

23. A computer program (605) comprising computer readable code means to be run in an IRU (210) of a base station system (200), the base station system comprising the IRU (210), a BBU (230) connected to the IRU (210), and a first RH (221 ) connected to the IRU (210) via a packet data network (240), the first RH (221 ) being arranged for wireless transmission in RF of a plurality of antenna carriers to UEs (250), the plurality of antenna carriers being transmitted from the first RH at individually different RFs, which computer readable code means when run in the IRU causes the IRU (210) to perform the following steps:

receiving, from the BBU (230), a plurality of first digital representations of the plurality of antenna carriers of the first RH (221 ), each first digital representation representing one antenna carrier, the plurality of first digital representations being received in a baseband frequency range,

frequency multiplexing the plurality of first digital representations of the plurality of antenna carriers into a second digital representation over a first bandwidth; and

transmitting the second digital representation to the first RH (221 ).

24. A carrier containing the computer program (605) according to claim 23, wherein the carrier is one of an electronic signal, optical signal, radio signal or computer readable storage medium.

25. A radio head, RH, (221 ) operable in a base station system (200), the RH (221 ) being arranged for wireless transmission in radio frequency, RF, of a plurality of antenna carriers to user equipments, UEs (250), the plurality of antenna carriers are to be transmitted from the RH (221 ) at individually different RFs, the base station system comprising the RH (221 ), an intermediate radio unit, IRU, (210) connected to the RH (221 ) via a packet data network (240), and a baseband unit, BBU, (230) connected to the IRU (210), the RH (221 ) comprising a processor (803) and a memory (804), said memory containing instructions executable by said processor, whereby the RH (221 ) is operative for:

receiving, from the IRU (210), a second digital representation in a first bandwidth, the second digital representation comprising a plurality of first digital representations of the plurality of antenna carriers, each first digital representation representing one antenna carrier, the plurality of first digital representations of the plurality of antenna carriers being frequency multiplexed into the second digital representation across the first bandwidth,

frequency converting the second digital representation into radio frequency, and

wirelessly transmitting the converted second digital representation to the UEs (250).

26. RH (221 ) according to claim 25, the RH comprising a power amplifier for amplifying the frequency converted second digital representation, the RH further being operative for:

sampling and digitizing an output signal from the power amplifier, and sending the sampled and digitized output signal to the IRU (210) as a TOR signal, for use by the IRU when performing DPD.

27. RH (221 ) according to claim 26, further being operative for compressing the TOR signal before sending the TOR signal to the IRU.

28. RH (221 ) according to any of claims 25-27, wherein the received second digital representation is a compressed version of an original version of the second digital representation, the second digital representation being compressed according to a compression scheme, the RH further being operative for decompressing the received second digital representation according to the

compression scheme to obtain a version of the second digital representation corresponding to the original version.

29. A computer program (805) comprising computer readable code means to be run in a RH (221 ) of a base station system (100), the RH (221 ) being arranged for wireless transmission in RF of a plurality of antenna carriers to UEs (250), the plurality of antenna carriers being transmitted from the RH (221 ) at individually different RFs, the base station system comprising the RH (221 ), an IRU (210) connected to the RH (221 ) via a packet data network (240), and a BBU (230) connected to the IRU (210), which computer readable code means when run in the RH causes the RH (221 ) to perform the following steps:

receiving, from the IRU (210), a second digital representation in a first bandwidth, the second digital representation comprising a plurality of first digital representations of the plurality of antenna carriers, each first digital representation representing one antenna carrier, the plurality of first digital representations of the plurality of antenna carriers being frequency multiplexed into the second digital representation across the first bandwidth,

frequency converting the second digital representation into radio frequency, and

wirelessly transmitting the converted second digital representation to the UEs (250).

30. A carrier containing the computer program (605) according to claim 29, wherein the carrier is one of an electronic signal, optical signal, radio signal or computer readable storage medium.

31 . An IRU (210) operable in a base station system (200), the base station system comprising the IRU (210), a BBU (230) connected to the IRU (210), and a first RH (221 ) connected to the IRU (210) via a packet data network (240), the first RH (221 ) being arranged for wireless transmission in RF of a plurality of antenna carriers to UEs (250), the plurality of antenna carriers being transmitted from the first RH at individually different RFs, the IRU (210) comprising:

a receiving module (704) for receiving, from the BBU (230), a plurality of first digital representations of the plurality of antenna carriers of the first RH (221 ), each first digital representation representing one antenna carrier, the

plurality of first digital representations being received in a baseband frequency range,

a frequency multiplexing module (706) for frequency multiplexing the plurality of first digital representations of the plurality of antenna carriers into a second digital representation over a first bandwidth; and

a transmitting module (708) for transmitting the second digital representation to the first RH (221 ).

32. An RH (221 ) operable in a base station system (200), the RH (221 ) being arranged for wireless transmission in radio frequency, RF, of a plurality of antenna carriers to user equipments, UEs (250), the plurality of antenna carriers being transmitted from the RH (221 ) at individually different RFs, the base station system comprising the RH (221 ), an intermediate radio unit, IRU, (210) connected to the RH (221 ) via a packet data network (240), and a baseband unit, BBU, (230) connected to the IRU (210), the RH (221 ) comprising:

a receiving module (904) for receiving, from the IRU (210), a second digital representation in a first bandwidth, the second digital representation comprising a plurality of first digital representations of the plurality of antenna carriers, each first digital representation representing one antenna carrier, the plurality of first digital representations of the plurality of antenna carriers being frequency multiplexed into the second digital representation across the first bandwidth,

a frequency converting module (906) for frequency converting the second digital representation into radio frequency, and

a transmitting module (908) for wirelessly transmitting the converted second digital representation to the UEs (250).