JPH1146199A - Polling method and system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease a delay in transfer of service with respect to a signal with high priority in the polling system adopting the ATM-PDS method. SOLUTION: A subscriber management section 2 of a station side equipment inquires of a transmission request to all terminal equipments at a subscriber equipments connected based on assignment information of a required band and a standby band from a service band management section 1 while designating a terminal equipment permitting transmission and a class of the transmission service. A transmission request management section 3 at the subscriber side equipment discriminates whether or not the transmission request from the station side equipment is assigned to itself and extracts it when the transmission request is assigned to itself and sends it to a service discrimination section 4. The service discrimination section 4 discriminates a class of the transmission service of the transmission request addressed to itself and instructs the transmission of the service information of the corresponding class to a service information generating section 5. The service information generating section 5 sends the service information of the class instructed by the service information discrimination section 4 to the station side equipment. An information assignment section 7 manages a transmission interval for each service class and assigns transmission information of the service class with respect to the standby band when no transmission permission is received with respect to the service class at a prescribed interval and the service information generating section 5 sends a polling reply to the station side equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ATM (Asynchro
nous Transfer Mode: Asynchronous transfer mode-PDS (Pa
ssive Double Star) relates to a polling method in a subscriber transmission method.

[0002]

2. Description of the Related Art As an economical broadband access network for realizing multimedia communication services from low speed to high speed, there is an ATM-PDS system based on ATM technology. The ATM-PDS system is characterized in that a plurality of users can share an optical fiber resource, and furthermore, has a feature of efficiently transmitting multimedia possessed by an ATM, thereby constructing an economical broadband access system. be able to.

[0003] In the ATM, the bandwidth required for the communication channel (the required uplink signal capacity calculated from the number of service subscribers) can be freely allocated, and the service type (P
OTS (Plain Old Telephone Service), ISDN, A
The required bandwidth is allocated according to TM or the like.

In the conventional ATM-PDS polling system, even if a terminal installed at a subscriber's house accommodates a different service, the subscriber terminal from the subscriber management unit of the station device. In the polling for, transmission permission is given for each terminal regardless of the type of service,
The terminal that has received the transmission permission is transmitting without regard to the type of service.

[0005]

For this reason, a conventional polling method for a network in which high-priority services and low-priority services coexist in each subscriber terminal according to an agreement with a contractor. When the system is adopted, transmission permission is equally performed without discrimination between them, so that it has been difficult to transmit a high priority signal with a small delay. In addition, when an error occurs during transmission of polling information, it also causes a large delay.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce a delay in transmitting a service to a signal having a high priority and to minimize a delay when an error occurs during transmission of polling information.

[0007]

SUMMARY OF THE INVENTION The present invention provides an ATM-PD
In the S system, a service band management unit that manages a required band for each service type, and a subscriber management unit that adds a spare band to a service band based on information from the service band management unit and performs transmission management for each subscriber. A transmission request management unit that separates a transmission request assigned to itself from a received signal; a service determination unit that determines a transmission service type from among the received transmission requests; And a subscriber unit having an information allocating unit for allocating information to the spare band when transmission permission for a specific service is not received at predetermined intervals.

[0008] With this configuration, the polling request is made not for each terminal but for each terminal / service type, so that transmission management corresponding to the service-unit polling request received in the terminal design can be performed. The service transmission delay can be reduced.
Further, by allocating a spare band and monitoring the transmission interval, it is possible to suppress a delay when an error occurs during transmission of polling information.

[0009]

FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, the optical line terminal is connected to a plurality of optical network units via an optical branch 6. The service band management unit 1 of the optical line terminal, for each service type,
The required bandwidth, which is the required uplink signal capacity calculated from the number of service subscribers, that is, the bandwidth allocated as the amount of information that can be collected per unit time and the spare bandwidth are allocated. As the spare band, a band obtained by subtracting a necessary band from MAX of a band provided between the station side and the subscriber can be allocated.

The subscriber management unit 2 distributes service information to each subscriber based on the bandwidth allocation information from the service bandwidth management unit 1 and manages transmission to the subscriber device.

The transmission request management unit 3 of the subscriber unit determines from the signal received from the station side device whether or not the transmission request is assigned to itself, and if the transmission request is addressed to itself, it is determined. To separate. The service determining unit 4 determines the type of the transmission service from the received transmission request addressed to itself. The information allocating unit 7 manages transmission intervals for each service type, and allocates information to a spare band when transmission permission for a specific service is not received at predetermined intervals. The service information generating unit 5 responds to the optical line terminal with information on the corresponding service as a polling response.

Next, the operation of the present invention will be described with reference to FIG. The subscriber management unit 2 of the optical line terminal, based on the allocation information of the required band and the spare band for each service type from the service band management unit 1, determines the number of the subscriber side devices connected via the optical branch 6. A transmission request is inquired to all the terminals by designating a terminal to which transmission is permitted and a type of transmission service.

In the subscriber unit, the transmission request management unit 3 of each terminal determines whether the transmission request from the station unit is a transmission request assigned to itself, and determines whether the transmission request is addressed to itself. If there is, it is extracted and sent to the service determination unit 4. The service determining unit 4 determines the type of the transmission service of the transmission request addressed to itself, and instructs the service information generating unit 5 to transmit the corresponding service type via the information allocating unit 7. The service information generation unit 5
The service information of the type specified by the service information determination unit 4 is transmitted to the optical line terminal via the transmission request management unit 3 and the optical branch 6.

The information allocating unit 7 manages the transmission interval for each service type. If the station side apparatus does not receive a transmission permission for the service type at a predetermined interval, the information is allocated to the spare band. The transmission information of the service type is allocated, and the service information generation unit 5 transmits the information to the optical line terminal as a polling response.

The subscriber management unit 2 of the optical line terminal adjusts the number of polls according to the service type. For example, frequent polling is performed for a service type with a high priority, so that a high priority is set. It is possible to minimize the transmission delay of the service type.

[0016]

According to the polling method of the present invention, since the polling request is made not for each terminal but for each terminal / service type, in the terminal design, transmission management specialized for the received service unit polling request is performed. As a whole, the effect of delay in service transmission can be reduced.

Further, according to the present invention, a spare band is allocated to a service band, and when there is no transmission permission for a specific service at a predetermined interval, information is allocated using the spare band to respond to the optical line terminal. Therefore, even if an error occurs during the transmission of the polling information, the delay caused by the error can be suppressed.

[0018]

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 service bandwidth management unit 2 subscriber management unit 3 transmission request management unit 4 service discrimination unit 5 service information generation unit 6 optical branch 7 information allocation unit

Claims (7)

[Claims] 1. A station-side device manages, for each service type, allocation of a band allocated as an amount of information that can be collected per unit time and allocation of a spare band,
An inquiry of a transmission request is performed by specifying a terminal to which transmission is permitted and a type of transmission service, and each terminal of the subscriber side apparatus
The transmission request and the transmission service type assigned to the terminal device are determined from the received signal, the information of the corresponding service type is transmitted to the optical line terminal, and the transmission interval for each service type is managed. The ATM-P is characterized in that when the transmission of the service is not permitted at intervals, the service of the type is allocated to the reserved band and transmitted to the optical line terminal as a polling response.
Polling method in DS system. 2. The spare band is assigned a band obtained by subtracting a band required by each service type from a maximum value of a band installed between the station side and a subscriber. Polling method. 3. The polling method according to claim 1, wherein a priority is assigned to each service type. 4. The polling method according to claim 3, wherein the station-side device requests transmission more frequently for a service type with a higher priority than for a service type with a lower priority. 5. A service band management unit for managing a required band for each service type, and a subscriber who adds a spare band to a service band based on information from the service band management unit and performs transmission management for each subscriber. A station device having a management unit, a transmission request management unit for separating a transmission request assigned to itself from a received signal, a service determination unit for determining a transmission service type from the received transmission request, and a service And a subscriber device having an information allocating unit for instructing the allocation of information of the service to the spare band when transmission permission for the service is not received at predetermined intervals. A characterized by being
Polling method in the TM-PDS method. 6. A service band management unit that manages a required band for each service type, and a subscriber that performs transmission management for each subscriber by adding a spare band to a service band based on information from the service band management unit. A station device in the ATM-PDS system, comprising a management unit, and transmitting a transmission request signal to a subscriber device by designating a terminal and a service type. 7. A transmission request management unit for receiving a transmission request signal from an optical line terminal, discriminating and separating a transmission request assigned to itself from the received signal, and A service discriminator for discriminating the type of transmission service from, and information for managing a transmission interval for each service and instructing the allocation of information of the service to a spare band when transmission permission for the service is not received at a predetermined interval. Allocating unit, and when the transmission permission is allocated to itself, sends the information of the service type determined by the service determining unit to the station side device, and at the predetermined interval, When there is no transmission request from the optical line terminal, the information of the service is allocated to the reserved band and transmitted to the optical line terminal. Subscriber device in the ATM-PDS system to.