Device and method for maintaining synchronization and frequency stability in a wireless telecommunication system
First Claim
Patent Images
1. A method for maintaining frequency stability in a wireless device of a telecommunication system which uses a network clock for normal operation thereof and in which the wireless communication device requires a clock input with a frequency more stable than that of a PEX system clock, the method comprising the steps of:
- (a) providing an input to the wireless communication device from the PBX system clock;
(b) operating the wireless communication device with reference to a precision oscillator which has a frequency stability which meets or exceeds the frequency stability requirement of the wireless communication device;
(c) frequency synchronizing PBX system clock to network clock; and
(d) evaluating the frequency stability of the PBX system clock input with reference to the precision oscillator, and based on the evaluation,(1) maintaining frequency stability of the wireless clock to the PBX system clock input while the frequency stability of the PBX system clock input meets the frequency stability requirement of the wireless communication device, and(2) not maintaining frequency stability of the wireless clock to the PBX system clock input while the frequency stability of the PBX system clock input does not meet the frequency stability requirement of the wireless communication device.
3 Assignments
0 Petitions
Accused Products
Abstract
Techniques employed to guarantee isochronous operation of a wireless system to within Federal Communication Commission, Unlicensed Personal Communication System (UPCS) requirements. Synchronization and frequency stability is tracked and maintained for more than one frequency references of stratum 3 or better in a wireless telecommunication system.
-
Citations
10 Claims
-
1. A method for maintaining frequency stability in a wireless device of a telecommunication system which uses a network clock for normal operation thereof and in which the wireless communication device requires a clock input with a frequency more stable than that of a PEX system clock, the method comprising the steps of:
-
(a) providing an input to the wireless communication device from the PBX system clock; (b) operating the wireless communication device with reference to a precision oscillator which has a frequency stability which meets or exceeds the frequency stability requirement of the wireless communication device; (c) frequency synchronizing PBX system clock to network clock; and (d) evaluating the frequency stability of the PBX system clock input with reference to the precision oscillator, and based on the evaluation, (1) maintaining frequency stability of the wireless clock to the PBX system clock input while the frequency stability of the PBX system clock input meets the frequency stability requirement of the wireless communication device, and (2) not maintaining frequency stability of the wireless clock to the PBX system clock input while the frequency stability of the PBX system clock input does not meet the frequency stability requirement of the wireless communication device. - View Dependent Claims (2, 3, 4, 5, 9, 10)
-
-
6. A wireless communication device of a telecommunication system which uses a PBX system clock for normal operation thereof, the wireless communication device requiring a clock input with a frequency more stable than that of the PBX system clock, the wireless communication device comprising:
-
(a) means for receiving a wireless clock input from the system clock; (b) a wireless clock operating the wireless communication device which has a frequency stability which meets the frequency stability requirement of the wireless communication device; (c) means for frequency synchronizing said wireless clock to the PBX system clock input; and (d) means for evaluating the frequency stability of the PBX system clock input with reference to a precision oscillator, wherein the frequency synchronization of said wireless clock to the PBX system clock input is maintained while the frequency stability of the PBX system clock input meets the frequency stability requirement of the wireless communication device, and frequency synchronization of said wireless clock to the PBX system clock input is not maintained while the frequency stability of the PBX system clock input does not meet the frequency stability requirement of the wireless communication device. - View Dependent Claims (7, 8)
-
Specification