CELLULAR ANTENNAS AND COMMUNICATIONS METHODS
An antenna includes a main controller for communicating with an external system, a plurality of peripheral devices and a number of sub-controllers. The peripheral devices are associated with sub-controllers. The main controller communicates with the peripheral devices over a hybrid communications bus, addressing both bus-addressable devices and serial addressable devices.
1 . An antenna including:
i. a main controller configured to communicate commands or data between the antenna and a remote controller;
ii. a plurality of peripheral devices configured to monitor an attribute of the antenna or control an actuator of the antenna;
wherein each peripheral device is associated with a sub-controller connected to the main controller by a common data bus which conveys commands or data between the main controller and the sub-controller.
2 . An antenna as claimed in claim 1 wherein the peripheral devices include one or more devices from the group consisting of: antenna actuators controlling azimuth angle, downtilt angle or beamwidth; GPS receivers; azimuth angle sensors; inclinometers; phase sensors; position sensors; phase shifters; mechanical drivers; motors; and solenoid drivers.
3 . An antenna as claimed in claim 1 wherein the peripheral devices are bus-addressable or serial addressable objects or devices.
4 . An antenna as claimed in claim 1 wherein the main controller is configured to communicate commands or data between the antenna and a remote controller over a wired, wireless or optical link.
5 . An antenna as claimed in claim 1 wherein the data bus includes one or more data lines and one or more address lines, and the main controller is configured to:
a. communicate commands or data over the one or more data lines and to communicate address data over the one or more address lines when communicating commands or data with some of the sub-controllers; and
b. communicate commands or data and address data over data lines when communicating commands or data with others of the sub-controllers.
6 . An antenna as claimed in claim 5 wherein the data bus includes two differential data lines, two power lines and four address lines.
7 . An antenna as claimed in claim 6 wherein the data bus interfaces using RJ45 connectors.
8 . An antenna as claimed in claim 5 wherein the main controller is configured to communicate commands or data and address data in packet form when communicating over the data lines, each packet including commands or data and address data.
9 . An antenna as claimed in claim 5 wherein the main controller is configured to communicate auxiliary signals over the address lines, when commands or data and address data are communicated over the data lines.
10 . An antenna as claimed in claim 9 wherein the auxiliary signals include a bus-addressable device signal indicating whether the peripheral device to be addressed is a bus-addressable device.
11 . An antenna as claimed in claim 9 wherein the auxiliary signals include mode data specifying a peripheral device mode.
12 . An antenna as claimed in claim 11 wherein the peripheral device mode is a member of the group consisting of: peripheral function mode, memory mode and peripheral type mode.
13 . An antenna as claimed in claim 12 wherein the memory mode specifies memory to be accessed for control of the peripheral device.
14 . An antenna as claimed in claim 12 wherein the peripheral type mode is from the group consisting of: power-level mode, power-critical mode and a protocol mode.
15 . An antenna as claimed in claim 9 wherein the auxiliary signals include a peripheral device present signal.
16 . An antenna as claimed in claim 9 wherein the auxiliary signals include indicator signals.
17 . An antenna as claimed in claim 1 including an expansion hub for increasing the number of peripheral devices that can be connected to the data bus.
18 . An antenna as claimed in claim 1 wherein the sub-controllers communicate with the master controller over the data bus using a listen-first, talk-second protocol.
19 . An antenna as claimed in claim 1 , the antenna being a cellular base station antenna.
20 . A cellular base station including one or more antennas as claimed in claim 19 controlled by a common remote controller.
21 . A system including:
i. two or more peripheral devices; and
ii. a master controller configured to communicate commands or data with the peripheral devices over a communications bus including one or more data lines and one or more address lines,
wherein the master controller is configured to:
a. communicate commands or data over the one or more data lines and to communicate address data over the one or more address lines when communicating commands or data with some of the peripheral devices; and
b. communicate commands or data and address data over data lines when communicating commands or data with others of the peripheral devices.
22 . A system as claimed in claim 21 , being part of a cellular antenna.
23 . A system as claimed in claim 21 wherein the communications bus includes two differential data lines, two power lines and four address lines.
24 . A system as claimed in claim 23 wherein the communications bus interfaces using RJ45 connectors.
25 . An antenna as claimed in claim 21 wherein the master controller is configured to communicate commands or data and address data in packet form when communicating over the data lines, each packet including commands or data and address data.
26 . An antenna as claimed in claim 21 wherein the master controller is configured to communicate auxiliary signals over the address lines, when commands or data and address data are communicated over the data lines.
27 . A system as claimed in claim 26 wherein the auxiliary signals include a bus-addressable device signal indicating whether the peripheral device to be addressed is a bus-addressable device.
28 . A system as claimed in claim 27 wherein the bus-addressable device signal is sent over one of the address lines.
29 . A system as claimed in claim 26 wherein the auxiliary signals include mode data specifying a peripheral device mode.
30 . A system as claimed in claim 29 wherein the peripheral device mode is a member of the group consisting of: peripheral function mode, memory mode and peripheral type mode.
31 . A system as claimed in claim 30 wherein the memory mode specifies memory to be accessed for control of the peripheral device.
32 . A system as claimed in claim 30 wherein the peripheral type mode is from the group consisting of: power-level mode, power-critical mode and a protocol mode.
33 . A system as claimed in claim 26 wherein the auxiliary signals include a peripheral device present signal.
34 . A system as claimed in claim 26 wherein the auxiliary signals include indicator signals.
35 . A system as claimed in claim 21 including an expansion hub for increasing the number of peripheral devices that can be connected to the communications bus.
36 . A system as claimed in claim 21 including one or more sub-controllers each associated with a peripheral device.
37 . A system as claimed in claim 21 wherein the peripheral devices communicate with the master controller using a listen-first, talk-second protocol.
38 . A system as claimed in claim 21 wherein the master controller is configured to receive command signals from an external system.