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Clock signal generator and wireless base station

A technology of clock signal and generating device, which is applied in the direction of generating/distributing signals, multiplexing communication, time division multiplexing system, etc., to achieve the effects of suppressing time-dependent changes, high-precision maintenance, and simple maintenance

Active Publication Date: 2012-04-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, a clock signal generating device that requires a high-precision oscillation frequency such as ±0.05ppm is not subordinate to a transmission clock that is only connected to a wired line that does not guarantee the frequency accuracy of a clock signal such as an IP (Internet Protocol: Internet Protocol) network. Use extremely expensive rubidium oscillators, or use GPS (Global Positioning System) with limited installation locations, or use high-precision OCOX (Oven Oven Crystal Oscillators), and can only be replaced and readjusted in about 3 years at most

Method used

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  • Clock signal generator and wireless base station
  • Clock signal generator and wireless base station
  • Clock signal generator and wireless base station

Examples

Experimental program
Comparison scheme
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Embodiment approach 1

[0051] figure 1 It is a diagram showing the composition of a communication network according to Embodiment 1 of the present invention. The wireless base station 11 and the base station control device 12 are connected through the same communication network, the time information server 13 is connected to another communication network, and the two communication networks are connected through the gateway 14 .

[0052] The wireless base station 11 is, for example, a W-CDMA base station, and is a wireless communication device that performs wireless communication with a low-end mobile communication terminal (not shown) and performs wired communication with a high-end base station control device 12 . The base station control device 12 is, for example, a W-CDMA-made RNC (Radio Network Controller: Radio Network Controller), which sends signals from further high-end devices to the wireless base station 11 in a wired manner, and transmits signals from the wireless base station 11 in a wired...

Embodiment approach 2

[0075] Image 6It is a diagram showing the composition of a communication network according to Embodiment 2 of the present invention. In the first embodiment, the time information server 13 provides the reference time information, but in the second embodiment, the base station control device 12 provides the reference time information instead of the time information server 13 . In this case, the base station controller 12 has a clock source whose accuracy is at least 2 digits higher than the clock signal generated by the clock signal generator 20 of the radio base station 11, or operates under the clock source. For example, in a W-CDMA mobile communication system, the base station control device 12 can transmit data to the wireless base station 11 at regular intervals. The node synchronization described in Non-Patent Document 3 (3GPP TS 25.427) or Non-Patent Document 4 (3GPP TS 25.435) can use one of them to transmit a signal called RFN (RNC Frame Number: RNC Frame Number) fro...

Embodiment approach 3

[0078] Figure 7 It is a diagram showing a detailed configuration of a clock signal generation unit according to Embodiment 3 of the present invention. In Embodiment 3, the clock signal generator 20 of Embodiment 1 ( figure 2 ), replaced by the clock signal generator 30 ( Figure 7 ). The clock signal generation unit 30 includes a constant drive oscillator unit 31 , an infrequent drive oscillator unit 32 , a phase comparison unit 33 , a control voltage indication unit 34 and a power control unit 35 in addition to the digital-to-analog conversion unit 26 and the storage unit 27 . The digital-to-analog conversion unit 26 and the storage unit 27 are the same as the first embodiment ( figure 2 ) is the same.

[0079] Constantly driven oscillating unit 31 is the same as Embodiment 1 ( figure 2 ) is the same as the voltage-controlled oscillation unit 21, which is always driven. The non-constantly driven oscillating unit 32 is a high-precision oscillator such as an OCXO (Ove...

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Abstract

A system and method of initializing an integrated circuit. The method includes initiating the integrated circuit and loading at least one initialization word from storage device. The storage device can be external from the integrated circuit. The integrated circuit can be initialized with at least one data value in the at least one initialization word. A system for initializing an integrated circuit is also disclosed.

Description

technical field [0001] The present invention relates to a clock signal generating device for generating a clock signal and a wireless base station using the device. Background technique [0002] As a clock signal generating device for a mobile communication terminal, there is a device that initializes the parameter at the point in time at which feedback control converges even if the reference frequency shifts due to time-dependent changes, that is, the parameter corresponding to the reference frequency that tracks the transmission frequency of the base station. The parameter table is rewritten and updated so that the reference frequency for initially tracking the transmission frequency of the base station is obtained even during the period of oscillation at the next start-up (for example, refer to Patent Document 1). For example, the mobile phone system in the 800MHz frequency band requires the base station tracking accuracy of the mobile communication terminal to be less th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B1/00H03B5/32H03L7/08H04W88/08
CPCG06F1/08H04J3/0685H03L7/08
Inventor 冈本圭史铃木邦之折田三千男
Owner MITSUBISHI ELECTRIC CORP