Method for installing a backhaul link with alignment signals
An intelligent backhaul system is disclosed for deployment in the presence of existing radio systems. A backhaul system for co-channel deployment with existing licensed and unlicensed wireless networks, including conventional cellular backhaul radios, Common Carrier Fixed Point-to-Point Microwave Service, Private Operational Fixed Point-to-Point Microwave Service and other FCC 47 C.F.R. §101 licensed microwave networks is disclosed. Processing and network elements to manage and control the deployment and management of backhaul of radios that connect remote edge access networks to core networks in a geographic zone which co-exist with such existing systems or other sources of interference within a radio environment are also disclosed.
1. A method for installing a backhaul link between a first backhaul radio and an at least one second backhaul radio, wherein each one of the first backhaul radio and the second backhaul radio comprises at least an antenna array comprising at least a plurality of directive gain antenna elements, and wherein each directive gain antenna element is couplable to at least one receive RF chain or transmit RF chain, said method comprising the steps of:
course aligning a physical configuration of the first backhaul radio or an arrangement of the antenna array within the first backhaul radio;
course aligning a physical configuration of the second backhaul radio or an arrangement of the antenna array within the second backhaul radio;
transmitting at least one alignment signal from the first backhaul radio using a first transmit antenna pattern or receiving in order to detect at least one alignment signal at the first backhaul radio using a first receive antenna pattern;
transmitting at least one alignment signal from the second backhaul radio using a second transmit antenna pattern or receiving in order to detect at least one alignment signal at the second backhaul radio using a second receive antenna pattern; and
one or more of the steps of:
fine aligning the physical configuration of the first backhaul radio or the arrangement of the antenna array within the first backhaul radio; and
fine aligning the physical configuration of the second backhaul radio or the arrangement of the antenna array within the second backhaul radio.
2. The method of claim 1 , further comprising the steps of:
scanning a plurality of radio frequency channels for detection of radio signals transmitted from one or more other radio systems, thereby generating scan data;
generating a scan report based on the scan data; and
transmitting the scan report to a server.
3. The method of claim 1 , further comprising the step of:
adjusting, upon a detection of at least one alignment signal at either of the first backhaul radio or the second backhaul radio, one or more of:
the first transmit antenna pattern;
the second transmit antenna pattern;
the first receive antenna pattern; and
the second receive antenna pattern.
4. The method of claim 1 , wherein prior to the detection of at least one alignment signal at either of the first backhaul radio or the second backhaul radio, the first transmit antenna pattern is the same as the second transmit antenna pattern.
5. The method of claim 1 , wherein prior to the detection of at least one alignment signal at either of the first backhaul radio or the second backhaul radio, the first transmit antenna pattern is the same as the first receive antenna pattern.
6. The method of claim 1 , wherein either or both of the first backhaul radio or the second backhaul radio operate under license from the Federal Communications Commission (FCC) under 47 Code of Federal Regulations (CFR) section 101 as a common carrier fixed point-to-point microwave service or as a private operational fixed point-to-point microwave service.
7. The method of claim 3 , wherein the adjusting of one or more of the first transmit, second transmit, first receive, and second receive antenna patterns comprises one or more of:
adjusting an effective radiation pattern of an antenna array;
selecting one or more ones of a plurality of directive gain antenna elements;
steering an effective radiation pattern in elevation; and
steering an effective radiation pattern in azimuth.
8. The method of claim 7 , wherein the adjusting the effective radiation pattern comprises:
calculating digital beam former weights based upon at least one constraint related to a potential of interference or an improvement of link performance; and
applying the digital beam former weights.
9. The method of claim 1 , wherein either or both of the course aligning steps utilizes at least one GPS location or compass direction.
10. The method of claim 9 , wherein at least one GPS location or compass direction is determined by an installation assisting device.
11. The method of claim 1 , wherein at least one of the pluralities of directive gain antenna elements comprises a first subset of one or more directive gain elements with a first polarization and a second subset of one or more directive gain elements with a second polarization, and wherein the first polarization is orthogonal to the second polarization.
12. The method of claim 11 , wherein the first polarization is vertical and the second polarization is horizontal.
13. The method of claim 1 , wherein at least one of the pluralities of directive gain antenna elements comprises at least one patch antenna element.
14. The method of claim 1 , wherein at least one transmit RF chain comprises at least a vector modulator and two digital to analog converters.
15. The method of claim 1 , wherein at least one receive RF chain comprises at least a vector demodulator and two analog to digital converters.
16. The method of claim 1 , wherein either or both of the course aligning steps comprises at least manually adjusting a bracket.
17. The method of claim 1 , wherein either or both of the fine aligning steps comprises at least physically moving one or more of a plurality of directive gain antenna elements by electrical or electromechanical control.
18. The method of claim 1 , wherein the alignment signal comprises at least one of an orthogonal code, a Walsh sequence or a Zadoff-Chu sequence.
19. The method of claim 7 , wherein the selecting of one or more ones of the plurality of directive gain antenna elements comprises selecting one or more of:
directive gain antenna elements with different angular patterns; and
directive gain antenna elements with different polarizations.
20. The method of claim 1 , wherein the detection of at least one alignment signal at either of the first backhaul radio or the second backhaul radio comprises at least one of detecting a preamble, a pilot tone, a pilot symbol, a training symbol, a periodicity, or a symbol rate correlation.