Digital multichannel interface within a radio distribution system
A digital multichannel interface for a first unit of a radio distribution system, the digital multichannel interface comprising a first uplink interface and a first downlink interface. The first uplink interface is configured to receive uplink transmit frames from a second unit of the radio distribution system, the uplink transmit frames including frame timing information, the radio distribution system including a plurality of remote units communicatively coupled to at least one of the first unit or the second unit. The first downlink interface is configured to: generate a plurality of reformatted wideband downlink I/Q data streams based on the frame timing information extracted from the uplink transmit frames received from the second unit; generate downlink transmit frames including the plurality of reformatted wideband downlink I/Q data streams; and provide the downlink transmit frames to the second unit.
1. A digital multichannel interface for a first unit of a radio distribution system, the digital multichannel interface comprising:
a first uplink interface configured to:
receive uplink transmit frames from a second unit of the radio distribution system, the uplink transmit frames including frame timing information, the radio distribution system including a plurality of remote units communicatively coupled to at least one of the first unit or the second unit; and
a first downlink interface configured to:
generate a plurality of reformatted wideband downlink I/Q data streams based on the frame timing information extracted from the uplink transmit frames received from the second unit;
generate downlink transmit frames including the plurality of reformatted wideband downlink I/Q data streams; and
provide the downlink transmit frames to the second unit.
2. The digital multichannel interface for the first unit of claim 1 , wherein the first uplink interface is configured to provide a plurality of reformatted wideband uplink I/Q data streams extracted from the uplink transmit frames received by the second unit to a first unit baseband unit via a digital front end.
3. The digital multichannel interface for the first unit of claim 2 , wherein the first downlink interface is configured to generate the plurality of reformatted wideband downlink I/Q data streams by scaling and sampling a plurality of raw wideband downlink I/Q data streams received from the first unit baseband unit via the digital front end, and
wherein the second unit includes a second downlink interface configured to extract the frame timing information from the downlink transmit frames, extract the plurality of reformatted wideband downlink I/Q data streams from the downlink transmit frames, provide the frame timing information to a second uplink interface, and provide the plurality of reformatted wideband downlink I/Q data streams to one or more remote units configured to provide the plurality of reformatted wideband downlink I/Q data streams to user equipment devices.
4. The digital multichannel interface for the first unit of claim 3 , wherein the second uplink interface includes a frame clock generator configured to generate uplink framing clock signals at a pre-determined clock rate, the uplink framing clock signals including the frame timing information.
5. The digital multichannel interface for the first unit of claim 4 , wherein the first downlink interface includes a multiplexer configured to synchronize the downlink transmit frames and the uplink transmit frames based on the frame timing information.
6. The digital multichannel interface for the first unit of claim 4 , wherein the second unit is configured to measure a time delay between the uplink framing clock signals generated at the frame clock generator and downlink framing clock signals provided by the second downlink interface, and wherein the first downlink interface or the first uplink interface is configured to compensate for the time delay.
7. The digital multichannel interface for the first unit of claim 1 , wherein the first unit includes multiple sectors of antenna ports, each sector of the multiple sectors configured to transmit signals at a different frequency from other sectors of the multiple sectors.
8. The digital multichannel interface for the first unit of claim 1 , wherein the second unit is configured to transmit the downlink transmit frames to an active beam- steering antenna configured to receive signals at horizontal and vertical polarization at different polarizations and different angles of arrival.
9. A digital multichannel interface for a first unit of a radio distribution system, comprising:
a first downlink interface configured to:
receive downlink transmit frames from a second unit of a radio distribution system, the downlink transmit frames including frame timing information, the radio distribution system including a plurality of remote units communicatively coupled to at least one of the first unit or the second unit; and
a first uplink interface configured to:
generate a plurality of reformatted wideband uplink I/Q data streams based on frame timing information extracted from the downlink transmit frames received from the second unit;
generate uplink transmit frames including the plurality of reformatted wideband uplink I/Q data streams; and
provide the uplink transmit frames to the second unit.
10. The digital multichannel interface for the first unit of claim 9 , wherein the first downlink interface is configured to receive the downlink transmit frames including a plurality of reformatted wideband downlink I/Q data streams and the frame timing information from a second downlink interface in the second unit, provide downlink framing clock signals including the frame timing information to the first uplink interface, and provide the plurality of reformatted wideband downlink I/Q data streams to one or more remote units via a first I/Q interface, the one or more remote units configured to provide the plurality of reformatted wideband downlink I/Q data streams to user equipment devices.
11. The digital multichannel interface for the first unit of claim 10 , wherein the first uplink interface includes a multiplexer configured to synchronize the downlink transmit frames and the uplink transmit frames based on the frame timing information.
12. The digital multichannel interface for the first unit of claim 10 , wherein the second downlink interface includes a frame clock generator configured to generate framing clock signals at a pre-determined clock rate, the framing clock signals including the frame timing information.
13. The digital multichannel interface for the first unit of claim 10 , wherein the first unit is configured to communicate the plurality of reformatted wideband uplink I/Q data streams and the plurality of reformatted wideband downlink I/Q data streams with a second unit including multiple sectors of antenna ports, each sector of the multiple sectors configured to transmit signals at a same frequency or a different frequency from other sectors of the multiple sectors.
14. The digital multichannel interface for the first unit of claim 10 , wherein the first unit is configured to transmit the downlink transmit frames to an active beam- steering antenna.
15. A method, comprising:
generating, at a first downlink interface of a first unit of a radio distribution system, a plurality of reformatted wideband downlink I/Q data streams;
receiving, at the first downlink interface, a framing clock signal including frame timing information generated at a second unit of the radio distribution system, the radio distribution system including a plurality of remote units communicatively coupled to at least one of the first unit or the second unit;
generating downlink transmit frames including multiplexing the plurality of reformatted wideband downlink I/Q data streams according to the frame timing information included in the framing clock signal; and
transmitting the downlink transmit frames to the second unit.
16. The method of claim 15 , further comprising:
extracting, at a second downlink interface included in the second unit, the plurality of reformatted wideband downlink I/Q data streams and the frame timing information from the downlink transmit frames;
transmitting the plurality of reformatted wideband downlink I/Q data streams to a first I/Q interface; and
transmitting downlink framing clock signals including the frame timing information to a second uplink interface included in the second unit.
17. The method of claim 16 , further comprising;
generating, at the second uplink interface, uplink framing clock signals including the frame timing information;
receiving the downlink framing clock signals from the second downlink interface; and
measuring a time delay between the uplink framing clock signals and the downlink framing clock signals.
18. The method of claim 15 , further comprising:
generating, at the second unit, uplink transmit frames including reformatted wideband uplink I/Q data streams according to the frame timing information included in the framing clock signal, wherein the downlink transmit frames and the uplink transmit frames are synchronized based on the frame timing information.
19. The method of claim 15 , further comprising transmitting, from the second unit, the downlink transmit frames to an active beam-steering antenna.
20. The method of claim 15 , wherein the downlink transmit frames are transmitted to the second unit via a plurality of sectors of antenna ports, each sector of the plurality of sectors transmitting signals at a same frequency or a different frequency from other sectors of the plurality of sectors.