Packet transmission system, packet transmission method, packet transmission program, and recording medium on which the recorded program is recorded
First Claim
Patent Images
1. A packet communication system, comprising:
- a master station configured to transmit a downstream packet signal including identification information for identifying transmission permission without receiving a transmission request; and
a slave station configured to receive the downstream packet signal transmitted from the master station and judge if transmission is permitted based on the identification information in the received downstream packet signal, whereinthe slave station is configured to transmit an upstream packet signal to the master station when the slave station judges that transmission is permitted,the master station includes a first timer configured to measure a limit time when the master station can judge if the upstream packet signal has been transmitted from the slave station to which transmission is permitted,the master station is configured to judge if the upstream packet signal transmitted from the slave station is received within the limit time measured by the first timer, stops the first timer when the master station has received the upstream packet signal, and updates the identification information for identifying transmission permission when the master station has not received the upstream packet signal,the master station includes a second timer configured to measure limit time when the master station can continuously receive the upstream packet signal transmitted from the slave station to which transmission has been permitted, andthe master station judges if receipt of the upstream packet signal transmitted from the slave station has ended within the limit time measured by the second timer, stops the second timer when the receipt has ended, and updates the identification information for identifying transmission permission when the receipt has not ended.
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Accused Products
Abstract
An OLT 1 sequentially allocates transmission permission of a packet on an upstream transmission line to a plurality of ONUs 2 registered, and performs packet communication in a simplified method with control by using a first timer for detecting a packet signal and a second timer for controlling transmission permission time, in order to transmit an IP packet of variable length without mounting a function of complex processing for analyzing an upstream packet in the OLT 1.
17 Citations
10 Claims
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1. A packet communication system, comprising:
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a master station configured to transmit a downstream packet signal including identification information for identifying transmission permission without receiving a transmission request; and a slave station configured to receive the downstream packet signal transmitted from the master station and judge if transmission is permitted based on the identification information in the received downstream packet signal, wherein the slave station is configured to transmit an upstream packet signal to the master station when the slave station judges that transmission is permitted, the master station includes a first timer configured to measure a limit time when the master station can judge if the upstream packet signal has been transmitted from the slave station to which transmission is permitted, the master station is configured to judge if the upstream packet signal transmitted from the slave station is received within the limit time measured by the first timer, stops the first timer when the master station has received the upstream packet signal, and updates the identification information for identifying transmission permission when the master station has not received the upstream packet signal, the master station includes a second timer configured to measure limit time when the master station can continuously receive the upstream packet signal transmitted from the slave station to which transmission has been permitted, and the master station judges if receipt of the upstream packet signal transmitted from the slave station has ended within the limit time measured by the second timer, stops the second timer when the receipt has ended, and updates the identification information for identifying transmission permission when the receipt has not ended. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A packet communication system, comprising:
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a master station configured to transmit a downstream packet signal including identification information for identifying transmission permission without receiving a transmission request; and a slave station configured to receive the downstream packet signal transmitted from the master station and judge if transmission is permitted based on the identification information in the received downstream packet signal, wherein the slave station is configured to transmit an upstream packet signal to the master station when the slave station judges that transmission is permitted, the master station transmits a downstream packet signal including overhead information indicating time when output of the upstream packet signal is unstable, and the slave station adds an overhead which is a group of signals not reproduced by the master station on a head of the upstream packet signal corresponding to the overhead information in the downstream packet signal transmitted from the master station.
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8. A packet communication system, comprising:
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a master station configured to transmit a downstream packet signal including identification information for identifying transmission permission without receiving a transmission request; and a slave station configured to receive the downstream packet signal transmitted from the master station and judge if transmission is permitted based on the identification information in the received downstream packet signal, wherein the master station includes a buffer configured to accumulate the downstream packet signal separately according to signal transmission speeds, and the master station reads out the downstream packet signal of various speeds accumulated in the buffer separately according to the signal transmission speeds, transmits the downstream packet signal of the various speeds read out, and permits a slave station which has been able to be synchronized with transmission speed of the downstream packet signal to transmit an upstream packet signal.
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9. A packet communication method, comprising:
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transmitting, from a master station, a downstream packet signal including identification information for identifying transmission permission without receiving a transmission request; receiving at a slave station the downstream packet signal transmitted from the master station; judging, at the slave station, if transmission is permitted based on an identification number of the received downstream packet signal; transmitting, from the slave station, an upstream packet signal to the master station when the slave station judges that transmission is permitted; measuring, at a first timer at the master station, a limit time when the master station can judge if the upstream packet signal has been transmitted from the slave station to which transmission is permitted; judging, by the master station, if the upstream packet signal transmitted from the slave station is received within the limit time measured by the first timer; stopping the first timer when the master station has received the upstream packet signal; updating the identification information for identifying transmission permission when the master station has not received the upstream packet signal; measuring, at a second timer at the master station, a limit time when the master station can continuously receive the upstream packet signal transmitted from the slave station to which transmission has been permitted; judging, at the master station, if receipt of the upstream packet signal transmitted from the slave station has ended within the limit time measured by the second timer; stopping the second timer when the receipt has ended; and updating the identification information for identifying transmission permission when the receipt has not ended.
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10. A computer-readable recording medium for recording a packet communication program for making a computer execute processing comprising:
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transmitting, from a master station downstream packet signal including identification information identifying transmission permission without receiving a transmission request; receiving at a slave station the downstream packet signal transmitted from the master station; judging, at the slave station, if transmission is permitted based on an identification number of the received downstream packet signal; transmitting, from the slave station, an upstream packet signal to the master station when the slave station judges that transmission is permitted; measuring, at a first timer at the master station, a limit time when the master station can judge if the upstream packet signal has been transmitted from the slave station to which transmission is permitted; judging, by the master station, if the upstream packet signal transmitted from the slave station is received within the limit time measured by the first timer; stopping the first timer when the master station has received the upstream packet signal; updating the identification information for identifying transmission permission when the master station has not received the upstream packet signal; measuring, at a second timer at the master station, a limit time when the master station can continuously receive the upstream packet signal transmitted from the slave station to which transmission has been permitted; judging, at the master station, if receipt of the upstream packet signal transmitted from the slave station has ended within the limit time measured by the second timer; stopping the second timer when the receipt has ended; and updating the identification information for identifying transmission permission when the receipt has not ended.
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Specification