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EPON channel transmission method for eliminating idle time

A technology of idle time and channel transmission, applied in the field of optical access network and optical communication

Inactive Publication Date: 2010-12-29
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The purpose of the present invention is to provide a kind of EPON channel transmission method that eliminates idle time on the basis of prior art, solve the idle time problem under the periodic polling mechanism, improve the transmission efficiency of EPON link

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  • EPON channel transmission method for eliminating idle time
  • EPON channel transmission method for eliminating idle time
  • EPON channel transmission method for eliminating idle time

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Embodiment Construction

[0027] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0028] as attached figure 1 As shown, under the traditional periodic polling mechanism, the idle time T idle It can be expressed as:

[0029] T idle =T DBA +RTT

[0030] If using a high-speed CPU, T DBA It can be ignored; in the EPON system, taking the extreme case where the distance between the OLT and the ONU is 20km as an example, the RTT can reach 0.2ms at this time, such as according to the usual polling period T in the periodic polling mechanism cycle = 2ms calculation, the idle time accounts for 10% of the polling cycle, during this time, the uplink channel is in an idle state, without data transmission, which greatly reduces the bandwidth utilization rate of the EPON system uplink.

[0031] The present invention eliminates the impact of idle time through the following technical solutions, and improves the bandwidth utilization rate of the ...

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Abstract

The invention discloses an Ethernet passive optical network (EPON) channel transmission method for eliminating idle time, and relates to the technical field of optical communication and optical access networks. The method comprises the following steps of: dividing optical network units (ONU) into a common ONU and an alternative ONU; transmitting a REPORT frame and a DATA frame of the common ONU together; transmitting the REPORT frame and the DATA frame of the alternative ONU separately; and taking the time when an optical line terminal (OLT) starts to perform bandwidth allocation as a start-stop movement of a polling cycle, in each polling cycle, first, uploading the DATA frame of the alternative ONU, then, uploading the REPORT frame and the DATA frame of the common ONU, and finally, uploading the REPORT frame of the ONU. The method uploads the data frame of the alternative ONU at the idle time of waiting the arrival of the authorization of the OLT in the mode of transmitting the REPORT frame and the DATA frame separately so as to eliminate the idle time under a conventional cycle polling mechanism and improve the bandwidth utilization rate of an uplink of an EPON system.

Description

technical field [0001] The invention relates to an EPON channel transmission method, in particular to an EPON channel transmission method capable of eliminating idle time, and belongs to the technical fields of optical communication and optical access network. Background technique [0002] Ethernet Passive Optical Network (EPON, Ethernet Passive Optical Network) is the main technology in the access network. EPON uplink / downlink uses 1310 / 1490nm wavelength for transmission respectively. In the uplink direction of EPON, a wavelength (1310nm) is shared by multiple user-side optical network units (ONU, Optical Network Unit) and the uplink bandwidth is shared by Time Division Multiple Access (TDMA, Time Division Multiple Address), so a dynamic bandwidth allocation algorithm is required (DBA, Dynamic Bandwidth Allocation) schedules the EPON uplink bandwidth. The DBA algorithm is the key technology of EPON, and efficiency and fairness are the main performance parameters for evalua...

Claims

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Application Information

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IPC IPC(8): H04Q11/00H04B10/12H04B10/25
Inventor 沈建华郭红梅
Owner NANJING UNIV OF POSTS & TELECOMM
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