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Communication system, station side communication device, user side communication device, communication method, and control device

A communication device and communication system technology, applied in multiplexing communication, optical multiplexing system, data exchange through path configuration, etc., can solve problems such as waste of power, and achieve the effect of reducing power consumption

Active Publication Date: 2014-05-14
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Keeping the ONU in a communicable state to measure the round-trip time even without data communication wastes power

Method used

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  • Communication system, station side communication device, user side communication device, communication method, and control device
  • Communication system, station side communication device, user side communication device, communication method, and control device
  • Communication system, station side communication device, user side communication device, communication method, and control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0047] ·Hardware structure

[0048] figure 1 It is a diagram showing a configuration example of Embodiment 1 of the PON system of the present invention. Such as figure 1 As shown, the PON system of this embodiment is equipped with OLT1 (master station apparatus) and ONU10-1-10-3 (slave station apparatus). OLT1 and ONU10-1-10-3 are connected by the optical fiber 30 via the splitter 40. The splitter 40 branches the optical fiber 30 of the main line connected to the OLT1 into the number of ONU10-1~10-3. In addition, ONU10-1 is connected to terminals 20-1 and 20-2. In addition, an example in which three ONUs are used is shown here, but the number of ONUs is not limited to this, and may be arbitrary. Hereinafter, when the ONU 10 is generally shown, it will be described as ONUi (1, 2, . . . , N, N is an integer greater than or equal to 1).

[0049] OLT1 is equipped with: control part 2 (OLT control part), implements the processing of OLT side according to PON agreement; Receiv...

Embodiment approach 2

[0141] In Embodiment 1, a PON system is described in which different idle periods are set according to the power saving mode. In Embodiment 2, a case will be described in which the OLT 1 ​​forcibly changes the power saving mode when the allowable delay time of downlink data is smaller than a predetermined threshold value when the power saving mode is selected or changed.

[0142] Figure 9 It is a flowchart explaining the process of the control part 2 in OLT1 of this Embodiment 2. The control unit 2 of the second embodiment can be applied to the communication system of the first embodiment, and is the same as that of the first embodiment regarding the overall communication system.

[0143] The control unit 2 is a control device used in a main machine such as the OLT 1 ​​and is composed of a combination of a digital signal processor, a general-purpose processor, and software. These processors are chip-formed by a highly integrated IC (Integrated Circuit), and function as the OL...

Embodiment approach 3

[0182] In the above-mentioned embodiments, the PON system in which different idle periods are set in the Tx sleep mode and the TRx sleep mode has been described. In Embodiment 3, a PON system in which different downtime periods are set for uplink and downlink will be described.

[0183] Figure 17 It is a sequence diagram showing the communication protocol in the sleep mode in this embodiment. exist Figure 17 in, with Figure 7 or Figure 8 The same symbols indicate the same timing. In this communication system, in the configuration step (step S2 ), the OLT 1 ​​transmits sleep_time 1 for uplink and sleep_time 2 for downlink to ONU 10 . sleep_time1 indicates a period during which the power consumption of the optical transmitter 141 is reduced (a sleep period of the optical transmitter 141 ), and sleep_time2 indicates a period during which the power consumption of the optical receiver 142 is reduced (a sleep period of the optical receiver 142 ).

[0184] The ONU 10 perfor...

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Abstract

An OLT 1 includes an OLT control unit 2 that generates a control signal for controlling a power saving operation of an ONU 10-1 by specifying a different idle period with respect to a first power saving operation in which an optical receiver 142 is operated while an optical transmitter 141 of the ONU 10-1 is controlled to a power saving state and a second power saving operation for controlling the optical transmitter 141 and the optical receiver 142 to the power saving state, and a station-side transmitter that transmits the control signal generated by the OLT control unit 2 to the ONU. The ONU 10-1 includes an ONU control unit 11 that receives the control signal via the optical receiver 142 to selectively perform the first power saving operation and the second power saving operation based on the idle period specified by the control signal.

Description

technical field [0001] The present invention relates to a communication system and a communication method in which a plurality of terminals are connected through a common line, for example, to a PON composed of an OLT (Optical Line Terminal: station-side communication device) and a plurality of ONUs (Optical Network Unit: user-side communication device) (Passive Optical Network, passive optical network) system, etc. Background technique [0002] In the PON system, in order to avoid data collision in the upstream direction transmitted from the ONU, the OLT and the ONU are synchronized to perform communication. The OLT plans to grant transmission permission to each ONU so that data in the upstream direction does not collide. At this time, the OLT considers the delay due to the distance from each ONU. Therefore, the OLT performs measurement of the round-trip time with each ONU and communication for survival. However, in transmission using an optical fiber, there are fluctuati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/44
CPCH04J14/0267Y02B60/32H04B10/272H04J14/0254H04L12/44H04J14/0221H04J14/0252H04L12/12H04J14/0247Y02B60/34Y02D30/50
Inventor 向井宏明田野文彦田中正基
Owner MITSUBISHI ELECTRIC CORP