JP2001285392A - Device and method for communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and method for communication which can improve the receiving probability. SOLUTION: A control means 9 controls the communication protocol for connection. A means of counting the number of PDU loss 6 counts the number of times the protocol data unit has been lost between connections. A parameter control means 5 controls the parameter setting to change the number of simultaneous resending of the same PDU depending on the number of lost times counted. When the number of lost times rises above the preset threshold value, it changes the setting of the times it resends the same PDU, so that the receiving probability can be improved by the control protocol in relation to the conditions of logic communication passages even when the traffic volume sharply increases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication protocol (SSCOP: service) of a logical communication path (connection) type.
The present invention relates to a communication device and a communication method using a specific connection oriented protocol.

[0002]

2. Description of the Related Art Conventionally, a logical communication path (connection) type call control protocol (S) of a broadband integrated digital communication network has been used.
SCOP) is recommended by the International Telecommunication Union Telecommunication Standardization Sector (ITU-T), for example, IT
U.T. 2110.
Here, the retransmission function of the protocol data unit (PDU) is such that the number of times of transmission to each protocol data unit at the time of retransmission is only one, and a communication device using a logical communication path (connection) type communication protocol. Then
Some do not have the function of changing the number of transmissions.

[0003]

In this type of conventional communication apparatus, the number of retransmissions of the protocol data unit at the time of retransmission is one, so that traffic between logical communication paths (connections) may increase. For this reason, in this type of communication device, when the quality of the network is reduced, the retransmission function of the protocol data unit of the communication protocol is activated, and the quality of the network is reduced even if the protocol data unit is retransmitted. May be discarded. As a result, a retransmission request for the same protocol data unit may have to be made again.

[0004] The present invention has been made in view of such circumstances, and has as its object to provide a communication device and a communication method capable of improving the reception probability.

[0005]

In order to achieve the above object, a communication apparatus according to the present invention comprises control means for controlling a communication protocol in a logical communication path, and loss of a protocol data unit between the logical communication paths. It is configured to include a counting means for counting the number of times, and a parameter management means for managing the setting change of the parameter of the number of simultaneous retransmissions in the same protocol data unit based on the counted number of lost protocol data units.

With this configuration, a logical communication path having a communication protocol function is controlled, and the number of lost protocol data units between the logical communication paths is counted.
The parameter setting means manages a change in the parameter setting of the number of simultaneous retransmissions in the same protocol data unit based on the number of lost protocol data units counted by the parameter management means. When the number of lost data exceeds a preset threshold value, By changing the setting of the number of times of transmission of the same protocol data unit, the reception probability can be improved in accordance with the state of the logical communication path even if the traffic suddenly increases using the communication protocol.

[0007] A communication device according to the present invention comprises a control means for controlling a communication protocol in a logical communication path, a clock means for counting a unit time, and the number of lost protocol data units between logical communication paths during the counted unit time. And parameter management means for changing the setting of the number of simultaneous retransmissions in the same protocol data unit based on the counted number of lost protocol data units.

With this configuration, the logical communication path having the function of the communication protocol is controlled, the number of lost protocol data units between the logical communication paths is counted in the united time, and the counted protocol number is calculated. By changing the setting of the number of simultaneous retransmissions for the same protocol data unit according to the number of lost data units,
When the number of losses exceeds a preset threshold, the setting of the number of transmissions of the same protocol data unit at the time of retransmission is changed. The reception probability can be improved according to the situation.

A communication device for a base station according to the present invention comprises: control means for controlling a communication protocol in a logical communication path of a broadband integrated digital communication network; and counting means for counting the number of lost protocol data units between the logical communication paths. And parameter management means for managing a setting change of a parameter of the number of simultaneous retransmissions in the same protocol data unit based on the counted number of lost protocol data units.

With this configuration, the base station controls the communication protocol, counts the number of lost protocol data units between logical communication paths, and uses the counted number of lost protocol data units to determine the same protocol data unit. By managing the setting change of the parameter of the number of simultaneous retransmissions in the unit, when the number of loss exceeds a preset threshold, the setting of the number of transmissions of the same protocol data unit at the time of retransmission is changed, and the communication protocol is changed. Even with traffic spikes,
The reception probability can be improved in the base station promptly according to the status of the logical communication path.

A communication device for a base station according to the present invention comprises a control means for controlling a communication protocol in a logical communication path of a broadband integrated digital communication network, a time measuring means for measuring a unit time, and a logical communication during the measured unit time. It is configured to include counting means for counting the number of lost protocol data units between paths, and parameter management means for changing the setting of the number of simultaneous retransmissions in the same protocol data unit based on the counted number of lost protocol data units. I do.

With this configuration, the base station performs processing for controlling a logical communication path having a communication protocol function, and determines the number of lost protocol data units between the logical communication paths during a unit time measured. Counting and managing the setting change of the parameter of the number of simultaneous retransmissions in the same protocol data unit based on the counted number of lost protocol data units, and when the number of losts exceeds a preset threshold, By changing the setting of the number of transmissions of the same protocol data unit and using the communication protocol in the base station, even if traffic increases rapidly, the base station responds quickly according to the connection situation and improves the reception probability Can be done.

A communication device for a mobile station according to the present invention comprises: control means for controlling a communication protocol in a logical communication path of a broadband integrated digital communication network; and counting means for counting the number of lost protocol data units between the logical communication paths. And parameter management means for managing a setting change of a parameter of the number of simultaneous retransmissions in the same protocol data unit based on the counted number of lost protocol data units.

With this configuration, the mobile station controls a logical communication path having a communication protocol function, counts the number of lost protocol data units between the logical communication paths, and calculates the number of lost protocol data units. By managing the setting change of the parameter of the number of simultaneous retransmissions in the same protocol data unit by the number of loss,
When the number of losses exceeds a preset threshold, the setting of the number of transmissions of the same protocol data unit at the time of retransmission is changed and the communication protocol is used. In the mobile station, the reception probability can be improved promptly in accordance with the situation.

[0015] A communication apparatus for a mobile station according to the present invention comprises a control means for controlling a communication protocol in a logical communication path of a broadband integrated digital communication network, a clock means for clocking a unit time, and a logical communication during the clocked unit time. It is configured to include counting means for counting the number of lost protocol data units between paths, and parameter management means for changing the setting of the number of simultaneous retransmissions in the same protocol data unit based on the counted number of lost protocol data units. I do.

With this configuration, the mobile station controls the logical communication path having the communication protocol function, and counts the number of lost protocol data units between the logical communication paths during the measured unit time. The parameter change of the number of simultaneous retransmissions in the same protocol data unit is managed by the number of lost protocol data units, and when the number of losses exceeds a predetermined threshold, the same protocol data unit at the time of retransmission is managed. By changing the setting of the number of transmissions and using the communication protocol, even if the traffic increases, the mobile station can quickly respond to the situation of the logical communication path and improve the reception probability.

According to the communication method of the present invention, a process for controlling a communication protocol in a logical communication path, a step of counting the number of times a protocol data unit is lost between logical communication paths, Managing the setting change of the parameter of the number of simultaneous retransmissions in the same protocol data unit by the number of losses,
Is provided.

By doing so, the communication protocol in the logical communication path is controlled, the number of lost protocol data units between the logical communication paths is counted, and the same protocol data unit is determined based on the counted number of lost protocol data units. Manages the setting change of the parameter of the number of simultaneous retransmissions, and when the number of losses exceeds a preset threshold, changes the setting of the number of transmissions of the same protocol data unit at the time of retransmission and uses the communication protocol As a result, even if the traffic increases, the reception probability can be improved by quickly responding to the connection status.

According to the communication method of the present invention, there are provided a process for controlling a communication protocol in a logical communication path, a step of measuring a unit time, and a step of measuring a protocol data unit between the logical communication paths during the measured unit time. The method includes a step of counting the number of times of loss, and a step of changing the setting of the number of simultaneous retransmissions in the same protocol data unit based on the number of times of loss of the counted protocol data unit.

In this manner, processing for controlling the communication protocol in the logical communication path is performed, the number of lost protocol data units between the logical communication paths is counted during the measured unit time, and the counted protocol data is counted. Change the setting of the number of simultaneous retransmissions for the same protocol data unit according to the number of units lost, and change the number of transmissions of the same protocol data unit at the time of retransmission when the number of losses exceeds a preset threshold By using the communication protocol, even if the traffic increases, it is possible to quickly respond to the situation of the logical communication path and improve the reception probability.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An object of the present invention is to improve the reception probability by quickly responding to the situation of a logical communication channel whose traffic has increased by using a communication protocol.

(Embodiment 1) Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a communication device according to Embodiment 1 of the present invention.

In FIG. 1, a communication device 1 includes a receiving circuit control unit 2, an input analysis processing unit 3, and a communication protocol (SSCO).
P: service specific connection oriened protoco
l) Processing unit 4, parameter management unit (parameter management means)
5, a protocol data unit PDU loss frequency counting unit (protocol data unit loss frequency counting means) 6, an output processing unit 7, and a transmission line control unit 8.

The control means 9 comprises a receiving circuit control section 2, an input analysis processing section 3, a communication protocol processing section 4, a parameter management section 5, an output processing section 7, and a transmission line control section 8. .

The receiving line control unit 2 receives a protocol data unit PDU from an opposite communication device (not shown). The input analysis processing unit 3 analyzes the type of the received protocol data unit PDU, and determines whether or not the protocol data unit PDU is a protocol data unit PDU of the type STAT-PDU.

In the communication protocol SSCOP function processing unit 4, the reception protocol data unit PDU is
Other protocol data unit P, not PDU
In the case of a DU, the process specified in the control protocol SSCOP is performed without counting the number of lost protocol data units PDU.

In the communication protocol SSCOP function processing unit 4, the reception protocol data unit PDU is
If it is a PDU, protocol processing is performed by receiving a STAT-PDU.

The protocol data unit PDU loss frequency counting section 5 counts the number of times PDUs are retransmitted in the process. The parameter management unit 6 changes the same number of retransmissions of the same protocol data unit PDU when the number of retransmissions exceeds or falls below a predetermined threshold (upper limit / lower limit).

The output processing section 7 performs output processing based on the output of the input analysis processing section or the output of the communication protocol SSCOP function processing section 4. The transmission line control section 8 controls the transmission line based on the output after the output processing, and transmits a transmission line control signal to the transmission line 100.

The operation of the first embodiment of the present invention will be described with reference to FIGS. FIG. 2 shows a processing flow of a procedure for changing the number of simultaneous retransmissions of the same protocol data unit PDU by counting the number of times a protocol data unit PDU is lost during communication. This will be described below with reference to the configuration of FIG. In the following description, step 201 is described as S201.

In step S201, the communication device 1 receives a PDU from the opposing communication device (not shown) by the function of the reception line control unit 2. In S202, the input analysis processing unit 3 receives the protocol data unit PD
U type is analyzed and its protocol data unit PD
It is determined whether U is a protocol data unit PDU of the type STAT-PDU.

The reception protocol data unit PDU is S
In the case of another protocol data unit PDU instead of the TAT-PDU, the communication protocol SSCOP function processing unit 4 does not count the number of times the protocol data unit PDU is lost in S203, and performs a specified process defined as the control protocol SSCOP. Will do.

When the reception protocol data unit PDU is S
If it is a TAT-PDU, the communication protocol SSC
The OP function processing unit 4 performs the protocol processing by the STAT-PDU reception, and in the processing, counts the number of times the protocol data unit PDU is retransmitted as the protocol data unit PDU loss number counting unit 6 (S20).
4).

If the number of retransmissions exceeds or falls below a predetermined threshold value (upper limit / lower limit) (in the case of T) (S205), in S206, the parameter management unit determines whether the same protocol data unit is used. P
The same retransmission count of the DU is changed.

If the received protocol data unit PDU is not a STAT-PDU in S202, in S207, a protocol process is performed by receiving another PDU, and the above process is ended (end).

FIG. 3 shows an example of a data transmission / reception sequence at the protocol data unit PDU level of the control protocol SSCOP. In the state where the traffic does not increase, the parameter setting is changed after the traffic increases, and thereafter the traffic decreases. This shows a sequence until the number of simultaneous retransmissions of the same protocol data unit PDU is returned again.

First, in order to establish an SSCOP connection, an SSCOP connection connection sequence is performed, data transfer is enabled, and data transmission and reception are performed. Here, the SD-PDU is data stored in order, and the information field provided by the SSCOP user is converted to a serial numbered PDU by the SSCOP.
Used to transfer via OP connection.

[0038] The POLL-PDU is a status request, and status information about the SSCOP communication device is transmitted to the SSCOP communication device.
Used to request via an OP connection.

The STAT-PDU is an invitation type status response, and is used to respond to a status request (POLL-PDU) received from the peer SSCOP communication device. The status request includes an SD indicating which SD-PDU was successfully received and which SD-PDU was lost.
-Information on the reception status of the PDU is also included.

The number of simultaneous retransmissions of the same PDU is the number of times the same PDU to be retransmitted is transmitted simultaneously when a PDU retransmission is requested. For example, if the number of simultaneous retransmissions is three,
This means that when a retransmission request is made, the target SD-PDU is retransmitted three times at a time. Other SSCO
The operation of P conforms to ITU-T Q.2110, and a detailed description is omitted here.

In FIG. 3, SD-PDUs No. 0 to No. 3 are transmitted from the transmitting side,
LL-PDU is transmitted, and STAT-P
DU has been returned. After that, the No. 1 again. 4-N
o. 7, four SD-PDUs are transmitted. At this time, assuming that an increase in traffic and a decrease in network quality have occurred, 4-No. No. 6 SD-PDU is lost on the network. 7 SD-PDU
More detailed explanation will be given assuming that only the data has been normally received.

At this time, the POL transmitted thereafter is
STAT-PDU which is a response to the L-PDU includes:
No. as data missing. 4, no. 5, No. 6 SD
-A PDU number has been specified. This STAT-PDU
When receiving the protocol data unit PDU, the protocol data unit PD
The number of U-losses is counted, and if the counted value exceeds a preset threshold value (upper limit), the parameter management unit 5 determines the number of simultaneous retransmissions of the same protocol data unit PDU by, for example, “3”. To "."

The sequence after the number of simultaneous retransmissions of the same protocol data unit PDU becomes “3” is PDU
No. where the loss occurred. 4-No. No. 6 SD-PDU is retransmitted. In this process, every time one SD-PDU is retransmitted, three identical SD-PDUs are transmitted.

On the receiving side, the same duplicated SD-PDU
Whenever three identical SD-PDUs are received, the SD-PDU is discarded. At this time, retransmission is completed, and a response to the subsequent POLL-PDU, ST
When the AT-PDU is received, the protocol data unit PDU loss number counting unit 6 again counts the number of protocol data unit PDU losses. If the counted value is smaller than a preset threshold value (lower limit value), the parameter management unit 5 changes the number of simultaneous retransmissions of the same protocol data unit PDU to “1”.

With such a configuration, the protocol data unit PDU generated when the traffic on the network increases and the network quality deteriorates
Loss can be counted, by changing the setting of the number of simultaneous retransmissions of the same protocol data unit PDU, and by controlling the retransmission of the protocol data unit PDU,
The reception probability can be improved.

(Embodiment 2) Embodiment 2 of the present invention will be described. FIG. 4 is a block diagram illustrating a configuration of the communication device according to the second embodiment of the present invention. The difference from the first embodiment is that a timekeeping unit is provided in the configuration of the communication device, and the other configurations are the same, and the same reference numerals are assigned and detailed description is omitted.

In FIG. 4, a communication device 1A is provided with a timer (clocking means) 11 for clocking a desired unit time.
The control means 9 manages the setting change of the parameter of the number of simultaneous retransmissions in the same protocol data unit based on the counted number of lost protocol data units.

Operation of Embodiment 2 FIGS. 5 and 6
This will be described with reference to FIG. FIG. 5 shows a processing flow of a procedure for changing the number of simultaneous retransmissions of the same protocol data unit PDU by counting the number of lost protocol data units PDU generated during communication.

First, the communication device 1A shown in FIG.
In 1, a signal corresponding to a protocol data unit PDU is received from an opposing communication device (not shown) by the operation of the reception line control unit 2. Proceeding to S502,
The input analysis processing unit 3 analyzes the type of the received protocol data unit PDU, and determines whether or not the protocol data unit PDU is a protocol data unit PDU of the type STAT-PDU.

When the reception protocol data unit PDU is S
If it is not a TAT-PDU but another protocol data unit PDU, in step S504, the number of lost PDUs is not counted, and the specified process defined as the control protocol SSCOP is performed in the control protocol (SSCOP).
Function) The processing unit 4 performs this.

When the reception protocol data unit PDU is S
If it is a TAT-PDU, in S503, the SS
When the COP function processing unit 4 performs protocol processing by STAT-PDU reception and proceeds to S504, the protocol data unit PDU loss frequency counting unit 6 counts the number of times the protocol data unit PDU is retransmitted in the processing.

At this time, if this processing is during the unit time for counting the number of lost protocol data units PDU,
The number of retransmissions this time is added to the total number of retransmissions performed during the measurement time. When the measurement time ends, in S505 to S509, when the total number of retransmissions exceeds or falls below a predetermined threshold (upper limit / lower limit) (when T)
Then, the parameter management unit 5 changes the number of times of the same protocol data unit PDU and adds it to the total number of retransmissions. In addition,
In S501, the reception protocol data unit PD
If U is not a STAT-PDU, in step S510, protocol processing is performed by receiving another PDU, and processing is set to EN.
D (End).

FIG. 6 shows an example of a data transmission / reception sequence at the protocol data unit PDU level of the control protocol SSCOP. In this sequence, the parameter setting after the traffic is increased is changed from the state where the traffic is not increased. Next, there is a sequence until the traffic decreases and returns to the original number of simultaneous retransmissions of the same protocol data unit PDU.

In FIG. 18-No. 21
The following description will be made on the assumption that the SD-PDU is transmitted and that the traffic increases and the network quality deteriorates. No. After transmitting 21 SD-PDUs,
When the STAT-PDU corresponding to the POLL-PDU is received and the protocol data unit PDU loss frequency unit time counted by the timing unit 11 ends, the protocol data unit PDU loss frequency counting unit 6 outputs the protocol data unit PDU loss frequency. Is counted.

If the counted value exceeds a preset threshold value (upper limit value), the parameter management unit 5 sets the number of simultaneous retransmissions of the same protocol data unit PDU to, for example, “3”. change. As a sequence after the number of simultaneous retransmissions of the same protocol data unit PDU becomes 3, the protocol data unit PDU
No. where the loss occurred. 19-No. 21 SD-PDUs
Is sent.

In this process, every time one SD-PDU is retransmitted, three identical SD-PDUs are transmitted. On the receiving side, when receiving the same identical SD-PDU, it is discarded. After that, the PDU counted by the timer 11 again
When the number-of-losses counting unit time has ended, the protocol data unit PDU is again
If the number of losses is counted and the counted value is below a preset threshold value (lower limit value), the parameter management unit 5 changes the number of simultaneous retransmissions of the same protocol data unit PDU to "1". I do.

Thus, on the network, the loss of the protocol data unit PDU which occurs when the traffic increases and the network quality deteriorates can be counted for each unit time, and the retransmission of the same protocol data unit PDU can be controlled. By doing so, the reception probability can be improved.

In the first and second embodiments described above, the SS having the function of the communication protocol SSCOP is used.
COP function processing unit 4, protocol data unit PDU loss frequency counting unit 6 for counting the number of data transmission room failures between connections, and parameter management for changing the setting of the number of simultaneous retransmissions of the same PDU based on the counted number of data transmission failures By controlling the communication protocol according to the status of traffic on the network by the communication devices 1 and 1A including the unit 5, the reception probability can be improved. The communication devices 1 and 1A can be used for base stations and mobile stations.

[0059]

According to the present invention as described above,
A communication device and a communication method capable of improving the reception probability can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a communication device according to a first embodiment.

FIG. 2 is a flowchart illustrating an operation of the communication device in FIG. 1;

FIG. 3 is a sequence diagram showing a simultaneous retransmission change process in the communication device in FIG. 1;

FIG. 4 is a block diagram illustrating a configuration of a communication device according to a second embodiment.

FIG. 5 is a flowchart illustrating an operation of the communication device in FIG. 4;

FIG. 6 is a sequence diagram showing a simultaneous retransmission change process in the communication device in FIG. 4;

[Explanation of symbols]

1, 1A communication device 5 Parameter management unit (parameter management means) 6 Protocol data unit PDU loss frequency counting unit
(Protocol data unit PDU loss count) 9 Control means 11 Timekeeping unit (Timekeeping means)

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Claims (8)

[Claims] 1. A control means for controlling a communication protocol in a logical communication path, a counting means for counting the number of lost protocol data units between the logical communication paths, and the same means based on the counted number of lost protocol data units. A communication device comprising: a parameter management unit that manages a setting change of a parameter of the number of simultaneous retransmissions in the protocol data unit. 2. A control means for controlling a communication protocol in a logical communication path, a clock means for measuring a unit time,
Counting means for counting the number of lost protocol data units between the logical communication paths during the unit time measured, and changing the setting of the number of simultaneous retransmissions in the same protocol data unit based on the counted number of lost protocol data units A communication device comprising: a parameter management unit. 3. A control means for controlling a communication protocol in a logical communication path of a broadband integrated digital communication network, a counting means for counting the number of lost protocol data units between the logical communication paths, and the counted protocol data unit A parameter management means for managing a setting change of a parameter of the number of simultaneous retransmissions in the same protocol data unit according to the number of times of loss. 4. A control means for controlling a communication protocol in a logical communication path of the broadband integrated digital communication network, a time measuring means for measuring a unit time, and a protocol data unit between the logical communication paths during the measured unit time. A base station comprising: counting means for counting the number of losses; and parameter management means for changing the setting of the number of simultaneous retransmissions in the same protocol data unit based on the counted number of losses of the protocol data unit. Communication device. 5. A control means for controlling a communication protocol in a logical communication path of a broadband integrated digital communication network, a counting means for counting the number of lost protocol data units between the logical communication paths, and the counted protocol data unit A parameter management means for managing a change in the setting of the parameter of the number of simultaneous retransmissions in the same protocol data unit according to the number of times of loss. 6. A control means for controlling a communication protocol in a logical communication path of a broadband integrated digital communication network, a timekeeping means for measuring a unit time, and a protocol data unit between the logical communication paths during the measured unit time. A mobile station, comprising: counting means for counting the number of losses; and parameter management means for changing the setting of the number of simultaneous retransmissions in the same protocol data unit according to the counted number of losses of the protocol data unit. Communication device. 7. A process for controlling a communication protocol in a logical communication path, a step of counting the number of lost protocol data units between the logical communication paths, and a step of counting the number of lost protocol data units. Managing the setting change of the parameter of the number of simultaneous retransmissions in the same protocol data unit. 8. A process for controlling a communication protocol in a logical communication path, a step of measuring a unit time, and counting the number of lost protocol data units between the logical communication paths during the measured unit time. And a step of changing the setting of the number of simultaneous retransmissions in the same protocol data unit based on the counted number of lost protocol data units.