JP3064978B2 - Polling method and method - Google Patents

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 device, 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 the received transmission request, and a service. It manages the transmission interval of each, when having not been transmitted authorization for a particular service at predetermined intervals, for the station-side device
And a subscriber device having an information allocating unit for instructing the allocation of a spare band .

[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 performs allocation of a required band, which is a required uplink signal capacity calculated from the number of service subscribers for each service type, that is, a band allocated as an information amount that can be collected per unit time. , And a backup band is allocated. This spare band can be assigned a band obtained by subtracting the required band of the service type from the MAX of the band installed between the station side and the subscriber. That is,
The service band management unit 1 of the station-side device communicates between the station and the subscriber.
From the entire bandwidth installed in between,
Remaining bandwidth after deducting required bandwidth allocated is reserved bandwidth
Is managed as

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 determination unit 4 determines the type of the transmission service from the received transmission request addressed to itself.
Information allocation section 7 manages the transmission interval of each service type, when having not been transmitted authorization for a particular service at predetermined intervals, performs assignment instruction backup band to the station side device. 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.

As described above, the station side device is allocated for each service type as a required bandwidth which is a required uplink signal capacity calculated from the number of service subscribers, that is, an information amount that can be collected per unit time. It manages the allocation of bandwidth and the allocation of spare bandwidth, and inquires of each subscriber terminal for transmission requests by specifying the terminals that are permitted to transmit and the type of transmission service. The allocating unit 7 manages a transmission interval for each service type, and when a transmission is not permitted for the service type at a predetermined interval from the optical line terminal , performs assignment instruction service type from the service information generation unit 5, and transmits a polling response to the optical line terminal.

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)

(57) [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. When transmission permission for the service is not received at intervals, an instruction for allocating a service of the type to the spare band allocated by the optical line terminal is issued.
Polling method using the ATM-PDS system and transmits to the central terminal as poll response. 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 that manages allocation of a required band, which is a required uplink signal capacity calculated from the number of service subscribers, and a backup band for each service type, and a service band management unit. A station-side device having a terminal to which transmission is permitted and a subscriber management unit for inquiring a transmission request by specifying the type of transmission service, 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 transmission interval for each service, when the transmission permission to the service is not this at intervals of, for the line terminal
A polling system using the ATM-PDS system, comprising: a subscriber device having an information allocating unit for instructing the allocation of the reserved band . 6. A service bandwidth management unit that manages allocation of a required bandwidth, which is a required uplink signal capacity calculated from the number of service subscribers, and a backup bandwidth for each service type, and a service bandwidth management unit. A terminal that permits transmission and a subscriber management unit that inquires of a transmission request by designating the type of transmission service based on an instruction to allocate a required band and a spare band for each service type. Station apparatus in a polling system using the ATM-PDS system. 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 a transmission service type from the server, and manages a transmission interval for each service, and when transmission permission for the service is not received at a predetermined interval, the service of the And an information allocating unit for instructing information allocation, and when transmission permission is allocated to itself, while transmitting information of the service type determined by the service determining unit to the optical line terminal, when the transmission request from the station-side device for that service is not this at predetermined intervals, assignment finger of the backup band for the station-side device
The subscriber device in the polling system using the ATM-PDS system, wherein the subscriber device sends an indication to the optical line terminal as a polling response.