Power monitoring system for a single site, split location trunked radio communication system

• US 5,689,801 A
• Filed: 11/14/1994
• Issued: 11/18/1997
• Est. Priority Date: 11/14/1994
• Status: Expired due to Term

• Current Assignee: Pine Valley Investments, Inc. (L3Harris Technologies, Inc.)
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Gwin, Kennard N., Canada, Robert O. III, Frichtel, John S.
• Primary Examiner(s): VO, NGUYEN THANH
• Application Number:
  US08/340,346
• Time in Patent Office: 1,100 Days
• Field of Search: 455/67.1, 455/67.4, 455/54.1, 455/67.3, 455/53.1, 455/8, 455/9, 455/54.2, 455/14, 370/16, 370/13.1, 370/327, 370/318, 359/174, 359/167, 375/211, 375/213
• US Class Current: 455/9
• CPC Class Codes: H04B 17/327 Received signal code power [RSCP]
• CPC Class Codes: H04B 17/40 of relay systems
• CPC Class Codes: H04W 4/10 Push-to-Talk [PTT] or Push-On-Call services
• CPC Class Codes: H04W 76/45 for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
• CPC Class Codes: H04W 84/08 Trunked mobile radio systems

Abstract

Base stations located at physically separate, remote locations are operated as a single site to permit trunked radio communications between portable radios located at those split sites. A first trunked RF communication site located at a first split site location includes plural first base stations, each first base station including a transceiver corresponding to an RF communications channel. The first site also includes a first site controller, connected to each of the first base stations, for assigning base station transceivers to radios requesting an RF communications channel. A second trunked RF communications site is located at a second split site location remote from the first split site location and includes plural second base stations along with a second site controller. A communication link links the first and second split sites so that they function as a single site trunked radio communications system with one of the first and second site controllers assigning the first and second base station transceivers to radios requesting RF communications channels. Base station transmitter power is measured at the split site locations and reported to the site controller currently in charge of the split location, single site trunked radio communications system.

Claims

1. A single site, split location trunked radio communications system, comprising:

plural portable radios;

a first trunked RF communications site located in a first split site location including plural first base station transceivers, each first base station transceiver corresponding to an RF communications channel, a first site controller assigning base station transceivers to radios requesting an RF communications channel, and a first power monitoring unit for monitoring the RF power transmitted by actively transmitting first base station transceivers;

a second trunked RF communications site located in a second split site location physically remote from the first split site location including plural second base station transceivers, each second base station transceiver corresponding to an RF communications channel, a second site controller for assigning base station transceivers to radios requesting an RF communications channel, and a second power monitoring unit for monitoring the RF power transmitted by actively transmitting second base station transceivers; and

a communications link linking the first and second trunked RF communications sites,

wherein the first and second trunked RF communications sites function as a single site with one of the first and second site controllers assigning both first and second base station transceivers to radios requesting an RF communications channel, and

wherein one of the first and second power monitoring units transmits monitored RF power information to the other of the first and second power monitoring units over the communications link.

2. The system in claim 1, further comprising:

wherein one of the site controller receives monitored RF power information for all of the first and second base station transceivers from the one of the first and second power monitoring units.

3. A single site, split location trunked radio communications system, comprising:

plural portable radios;

a first trunked RF communications site located in a first site location including plural first base station transceivers, each first base station transceiver corresponding to an RF communications channel, a first site controller assigning base station transceivers to radios requesting an RF communications channel, and a first power monitoring unit for monitoring the RF power transmitted by actively transmitting first base station transceivers;

a second trunked RF communications site located in a second site location physically remote from the first site location including plural second base station transceivers, each second base station transceiver corresponding to an RF communications channel, a second site controller assigning base station transceivers to radios requesting an RF communications channel, and a second power monitoring unit for monitoring the RF power transmitted by actively transmitting second base station transceivers;

wherein the first and second trunked RF split communications sites function as a single site with one of the first and second site controllers assigning both first and base station transceivers to radios requesting an RF communications channel, and

wherein one of the first and second power monitoring units manages monitored RF power data from both the first and second site locations.

4. The system in claim 3, further comprising:

a communications link linking the first and second trunked RF communications sites, the first and second power monitoring units communicating monitored RF power data over the communications link.

5. The system in claim 4, wherein the first site controls the operation of the first and second base stations so that they operate as a single site and the first power monitoring unit receives monitored RF power data from the second power monitoring unit over the communications link.

6. The system in claim 3 wherein the first and second power monitoring units include:

a data processor;

an analog to digital conversion unit;

an rf power detector generating an analog signal representing the RF power generated by a base station transmitter,

wherein the analog signal is converted into a digital signal by the analog to digital conversion unit and the data processor compares the digital signal with a threshold representing a desired power level.

7. In a radio communications system having plural portable radios, a first controller located at a first location along with plural first base station transceivers and a first power monitor for monitoring transmitted RF power from the first base station transmitters and a second location remote from the first location having plural second base station transceivers and a second monitor for monitoring transmitted RF power from the second base station transceivers, a method comprising:

operating the first and second base station transceivers at the first and second locations using only the first controller;

communicating transmitted RF power values from the second power monitor to the first power monitor; and

monitoring at the first controller located at the first location transmitted RF power from the first base station transmitters and the second base station transmitters using RF power values provided by the first power monitor.

8. The method in claim 7, wherein the first and second power monitors are connected by a fiber optic link.

9. The method in claim 7, wherein the second location includes a second controller for monitoring transmitted RF power from base station transmitters located at the first location and transmitted RF power from base station transmitters located at the second location when the first controller at the first location is absent or not enabled.

10. The method in claim 9, further comprising:

determining at both of the first and second power monitors which of the first and second controllers is operational.

11. In a split location, single site RF trunked communications system including first and second split site locations each having plural base station transceivers connected to first and second site controllers located at the first and second locations, respectively, a method comprising the steps of:

detecting at each location, which of the first and second site controllers is controlling operation of the split location, single site RF trunked communications system, and

monitoring the transmitted RF power of base station transceivers at both the first and second split site locations using only one of the first and second site controllers.

12. The method in claim 11, further comprising:

if the one site controller becomes unavailable or disabled, monitoring the transmitted RF power of base station transceivers at both the first and second split site locations using the other of the first and second site controllers.

13. The method in claim 11, further comprising:

comparing the transmitted RF power of base station transceivers at both the first and second split site locations to a minimum threshold value, and

deactivating any of the base station transceivers at both the first and second split site locations whose transmitted RF power is less than the minimum threshold value.