Digital distributed antenna systems and methods for advanced cellular communication protocols
Digital distributed antenna systems and methods for advanced cellular communication protocols are provided. In one embodiment, a digital distributed antenna system comprises: a host unit; a plurality of remote antenna units each communicatively coupled to the host unit, wherein a downlink digitized RF signal is transported from the host unit to at least one of the plurality of remote antenna units, and wherein the at least one of the remote antenna units is configured to generate an analog RF signal from the downlink digitized RF signal; and a signal conditioning and control module that extracts from a first digitized RF signal at least one data stream and converts the at least one data stream to baseband data.
1. A digital distributed antenna system, the system comprising:
a host unit;
a plurality of remote antenna units each communicatively coupled to the host unit, wherein a downlink digitized RF signal is transported from the host unit to at least one of the plurality of remote antenna units, and wherein the at least one of the remote antenna units is configured to generate an analog RF signal from the downlink digitized RF signal; and
a signal conditioning and control module that extracts from a first digitized RF signal at least one data stream and converts the at least one data stream to baseband data.
2. The system of claim 1 , wherein the first digitized RF signal is a downlink signal and the analog RF signal is generated at least in part from the baseband data.
3. The system of claim 1 , wherein the first digitized RF signal is an uplink signal and an uplink digitized RF signal is generated at least in part from the baseband data.
4. The system of claim 1 , wherein the signal conditioning and control module is implemented within at least one of:
a first remote antenna unit of the plurality of antenna units;
the host unit; or
an interviewing device between a first remote antenna unit and the host unit.
5. The system of claim 1 , wherein baseband data comprises one or both of Digitized Baseband RF data and Digital Baseband data.
6. The system of claim 1 , the signal conditioning and control module further comprising:
at least one digital demodulator;
a conditioner and control component;
a memory; and
at least one digital modulator;
wherein the digital demodulator converts the at least one data stream and stores a result as the baseband data into the memory.
7. The system of claim 6 , wherein the digital modulator digitally re-modulates the baseband data into a re-modulated digital RF signal.
8. The system of claim 6 , wherein the conditioner and control components applies one or more signal optimization algorithms to the baseband data.
9. The system of claim 6 , wherein the digital demodulator demodulates the baseband data from a first RF channel and the digital modulator re-modulates the baseband data onto a second RF channel.
10. The system of claim 6 , wherein the conditioner and control component modifies the baseband data before the digital modulator re-modulates the baseband data onto a second RF channel.
11. The system of claim 1 , wherein the signal conditioning and control module applies one or more signal optimizations to the baseband data.
12. The system of claim 11 , wherein the one or more signal optimizations include at least one of the following:
a signal gain adjustment;
a shift in RF carrier channel;
a signal phase adjustment; and
a digital pre-distortion.
13. The system of claim 1 , wherein the signal conditioning and control module implements with the base station one or more of:
mobility control;
retransmission control;
user-data concatenation-segmentation-reassembly;
physical layer control signals.
14. The system of claim 1 , wherein the signal conditioning and control module is configured to implement at least one of:
Packet Data Convergence Protocol (PDCP) for user data ciphering and header compression;
Radio Link Control (RLC) protocol for retransmission control by ARQ;
in-sequence packet delivery;
Medium Access Control (MAC) protocol for HARQ;
user data scheduling;
Radio Resource Control (RRC) protocol for mobility,
Quality of Service (QoS), and
security control.
15. A method for a digital distributed antenna system, the digital distributed antenna system including a host unit, and a plurality of remote antenna units each communicatively coupled to the host unit, wherein a downlink digitized RF signal is transported from the host unit to at least one of the plurality of remote antenna units, and wherein the at least one of the remote antenna units is configured to generate an analog RF signal from the downlink digitized RF signal, the method comprising:
receiving a digitized RF signal at a signal conditioning and control module associated with a first remote antenna unit of the plurality of remote antenna units;
with the signal conditioning and control module:
extracting from the digitized RF signal at least one data stream;
down-converting the at least one data stream to baseband data; and
generating an up-converted stream of digital RF data from the baseband data.
16. The method of claim 15 , wherein, the method further comprising:
generating at least part of the analog RF signal by up-converting the baseband data.
17. The method of claim 15 , wherein, the method further comprising:
transporting the up-converted stream of digital RF data to the host unit where it is combined with uplink digital RF signals from at least one other remote antenna unit into a unified uplink digital RF signal.
18. The method of claim 15 , wherein the first remote unit comprises a conditioner and control component, the method further comprising:
with the conditioner and control component, applying one or more signal optimizations to the baseband data.
19. The method of claim 18 , wherein the one or more signal optimizations include at least one of the following:
a signal gain adjustment;
a shift in RF carrier channel;
a signal phase adjustment; and
a digital pre-distortion.
20. The method of claim 18 , wherein with the conditioner and control component, the method further comprises implementing on or more of:
mobility control;
retransmission control;
user-data concatenation-segmentation-reassembly;
physical layer control signals.
21. The method of claim 15 , wherein the signal conditioning and control module modulates the baseband data onto a different RF channel than an RF channel from which it was down-converted from.
22. The method of claim 15 , wherein with the signal conditioning and control module, the method further comprises implementing on or more of:
the Packet Data Convergence Protocol (PDCP) for user data ciphering and header compression;
Radio Link Control (RLC) protocol for retransmission control by ARQ;
in-sequence packet delivery;
Medium Access Control (MAC) protocol for HARQ;
user data scheduling;
Radio Resource Control (RRC) protocol for mobility,
Quality of Service (QoS), and
security control.