JP3507661B2 - Communication device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device for performing data communication having two different synchronization establishment sequences.

[0002]

2. Description of the Related Art In recent years, various mobile communication systems have been developed with the development of communication technology and the expansion of communication needs.
As one of them, for example, PHS (Personal Handy Phone S
There is a digital cordless telephone device called ystem). The PHS includes, for example, HDLC (High Level Data Link Co) as data communication of a 32 Kbps non-digital bearer.
ntrol) communication method and PIAFS (PHS Internet Access Fo
rum Standard) Communication method is applied.

In the link establishment sequence of this HDLC communication system, there is no distinction between the activation side and the activation side, and the activation side and the activation side mutually send a flag (FLG) pattern,
The link is established by detecting it. The sequence is shown below. (1) Both the activation side and the activation side transmit the FLG pattern corresponding to the communication request. (2) If the FLG pattern from the other party can be detected, C
Send an ONNECT frame. (3) Link establishment is completed when the CONNECT frame from the other party can be received.

On the other hand, in the link establishment sequence of the PIAFS communication system, there is a distinction between the activation side and the activation side. The activation side detects the synchronization request frame from the activation side and sends this synchronization request frame to the activation side. This establishes the link. The sequence is shown below. (1) The activation side transmits a synchronization request frame corresponding to the communication request. (2) The activated side transmits the synchronization request frame after receiving the synchronization request frame from the activation side. (3) The activation side receives the synchronization request frame and completes the link establishment.

By the way, although there are various communication systems having different synchronization establishment sequences as described above, they are realized by different communication devices for each communication system. Therefore, when the communication device is connected to a line in which a plurality of types of communication methods coexist, there is an inconvenience that only one of the communication methods can be supported.

[0006]

As described above, in the conventional communication device, since various communication systems having different synchronization establishment sequences are realized by dedicated devices, respectively, a line in which a plurality of types of communication systems coexist. When connected to, there is the inconvenience that only one of the communication methods can be supported.

An object of the present invention is to provide a communication device which can realize link establishment of plural kinds of communication systems by one device and can perform data communication regardless of the communication system of the other party.

[0008]

In the communication device according to the present invention, the starting side and the activated side mutually send the same communication request, and a link is established by detecting this communication request. The communication method and the activation side and the activated side have communication requests different from those of the first communication method. The activated side detects the communication request from the activation side and sends a response to the detected communication request. The second that establishes the link by sending to the invocation side
And a communication request transmitting means for transmitting a communication request for data communication according to the first or second communication method to the other party, and a device for performing data communication having at least the other communication method. Based on a communication request detecting means for detecting a communication request for data communication by the first or second communication method, a time counting means for giving a time limit to the operation of the communication request detecting means, and a detection result of the communication request detecting means. , The request discriminating means for discriminating either the first or the second communication system and the time counting means for discriminating whether or not the time limit is exceeded, and if the time limit is exceeded, the second is sent to the communication request sending means. And a time-exceeding means for urging a communication request of this communication method.

According to this structure, the communication request from the other party is detected, and the communication method of the other party is discriminated based on the detection result. Therefore, the data according to the first communication method and the second communication method is used. A link can be adaptively established for communication. Further, since a time limit is imposed on the detection of the communication request from the other side, and when the time limit is exceeded, the communication request of the second communication method is sent out, so that different communication requests can be transmitted. Even with respect to the other party on the activated side operating in the second communication method that does not send a response, the communication method of the other party can be automatically switched to establish a link.

The communication apparatus according to the present invention has a first communication method in which the starting side and the activated side mutually send the same communication request, and the link is established by detecting the communication request,
The activation side and the activation side have a communication request different from the first communication method, the activation side detects the communication request from the activation side, and sends a response to the detected communication request to the activation side. A device for performing data communication having at least a second communication method for establishing a link by performing a communication request transmission for transmitting a communication request for data communication according to the first or second communication method to the other party. Means, communication request detecting means for detecting a communication request for data communication by the first or second communication method sent from the other side, time counting means for giving a time limit to the operation of the communication request detecting means, and communication Based on the detection result of the request detection unit, the request determination unit that determines either the first or the second communication method and the time counting unit determines whether the time limit is exceeded, and when the time limit is exceeded, The time requesting means for urging the communication request sending means to request the communication request of the second communication method, and the communication according to the communication method of the other side according to the result of the judgment by the request judging means and the result of the judgment by the time exceeding means. The communication system switching control means controls switching of the request transmission means and the communication request detection means.

According to this structure, the communication request from the other party is detected, the communication method of the other party is determined based on the detection result, and the communication method of the self device is switched so as to match the communication method of the other party. Therefore, the link can be adaptively established even if the other party supports the first communication method or the second communication method.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In FIG. 1, reference numeral 11 is a communication device, which is a line control unit 111, a PIAFS communication unit 112, an HDLC communication unit 113, and a communication request sending unit 11
4, a communication request detecting unit 115, a time counting unit 116, a request discriminating unit 117, a time exceeding unit 118, and a main control unit 119, and each circuit is connected to each other by a control bus 120.

Of these, the line control unit 111 controls connection with the communication line 20. The PIAFS communication unit 112 has a PIAFS communication protocol, and the HDLC communication unit 113 has an HDLC communication protocol. The communication request sending unit 114 sends an HDLC communication or PIAFS communication request signal of a designated method to the other party via the line control unit 111 and the communication line 20, and the communication request detecting unit 115 makes the other party's communication line 20. And line control unit 11
HDLC communication or PIAFS sent via 1
The communication request signal is detected.

The time counting unit 116 measures the waiting time for detecting the communication request signal from the other party, and the request determining unit 117 determines that the communication request detected by the communication request detecting unit 115 is HDLC.
A determination process of either communication or PIAFS communication is executed. The time excess unit 118 determines whether or not the time limit set by the time counting unit 116 is exceeded. If the communication request from the other party cannot be detected within the time limit, the communication request is transmitted. PIAF for the sending unit 114
It is urging the request for S communication.

The main control unit 119 performs overall control of each circuit, and in particular, according to the determination result by the request determination unit 117 and the determination result by the time exceeding unit 118, it is adapted to the communication system of the other party. The communication request transmission unit 114 and the communication request detection unit 115 are switch-controlled.

FIG. 2 is a flow chart shown to explain the operation of the main controller 119. In FIG. 2, the communication device 11 and the communication device on the other side are operating in a connected state.

First, the main control unit 119 sends a communication request (FLG pattern) for HDLC communication at the communication request sending unit 114 in order to indicate that data communication is performed to the other party by the HDLC communication method. Let At this time, the main control unit 119 causes the communication request detection unit 115 to simultaneously perform the FLG pattern detection process and the synchronization request frame reception check process. Here, the communication device 11 is P
In the case of IAFS communication, since the reception of the synchronization request frame is waited first, the operation on the activatable side is performed. Further, when the communication device 11 performs the PIAFS communication start side operation, the main control unit 119 first responds to this operation in order to handle this operation.
A time limit from when the FLG pattern is sent to when a response from the other party arrives is set, and a command is issued to the time counting unit 116 to measure this time (step S31).

Next, the main controller 119 causes the step S32.
Then, the communication request detection unit 115 is caused to detect the FLG pattern. Here, when the FLG pattern is detected (YES), the main control unit 119 causes the request determination unit 117 to determine that the communication method of the other party is HDLC communication, and then step S
In step 33, the communication request (synchronization request frame) reception check processing of PIAFS communication is stopped, and in step S34,
The link establishment procedure of HDLC communication is advanced.

Further, if the FLG pattern is not detected in step S32 (NO), the main control unit 119.
In step S35, issues a command to the communication request detection unit 115 to perform the synchronization request frame reception check process. Here, when the synchronization request frame is detected (YE
S), the request determination unit 117 determines that the communication method of the other party is PIAF.
S communication (start side) is determined, and in step S36, FL
A command is issued to the communication request transmission unit 114 and the communication request detection unit 115 to stop the transmission and detection of the G pattern,
In step S37, the procedure for establishing a PIAFS communication link is advanced. At this time, a synchronization reception frame is sent.

Further, in step S35, when the synchronization request frame is not detected (NO), the main control section 11
The step 9 checks whether or not the timer has reached the time limit in step S38. If it is reached (Y
ES), the main control unit 119 causes the time exceeding unit 118 to determine that the communication method of the other party is PIAFS communication (started side), and in step S39, stops transmission and detection of the FLG pattern, and performs PIAFS communication. Communication request sending unit 114 and communication request detecting unit 1 so as to send the synchronization request frame
A command is issued to 15, and the procedure of link establishment of PIAFS communication is advanced in step S40.

In step S38, if the time limit has not been reached (NO), the main controller 119 repeatedly executes the processing in step S32 and thereafter. Figure 3-
FIG. 5 shows a sequence in the case where the communication methods are combined.

FIG. 3 shows a sequence of link establishment in the HDLC communication system, and shows the case where the starting side and the activated side are as follows. (1) The activation side is the HDLC communication, and the activation side is the communication device 11.

(2) The calling / starting side is the communication device 11. (3) The activation side is the communication device 11, and the activation side is HDL
It is C communication. In this case, the FLG pattern of the HDLC communication is sent from the beginning on both the starting side and the activated side, so that the FLG patterns are mutually transmitted to each other.
An HDLC communication link is established by detecting the LG pattern and sending out a CONNECT frame.

FIG. 4 shows a sequence in the case where the starting side is the PIAFS communication and the started side is the communication device 11. First, the communication device 11, which is the activated side, transmits the FLG pattern as the operation of the HDLC communication.
Since the synchronization request frame for IAFS communication is received, PI
It operates by switching to AFS communication (started side), PIA
Establishes FS communication link.

FIG. 5 shows a sequence in the case where the activating side is the communication device 11 and the activated side is the PIAFS communication. First, the communication device 11 on the activation side sends an FLG pattern as an operation of HDLC communication, but there is no response from the other side, and the time limit is reached. When this time limit is exceeded, the communication device 11 switches to the PIAFS communication method, and as a PIAFS communication activation side operation, sends a synchronization request frame to the other party to establish a PIAFS communication link.

Therefore, according to the above-described embodiment, when the communication device 11 is on the activated side, by detecting the FLG pattern or the synchronization request frame corresponding to the communication request from the partner, the communication on the partner side is detected. It can be switched to suit the method. Further, when the communication device 11 is on the activation side, first, the FLG pattern is sent to the other party, and the FLG pattern from the other party is detected, so that the other party becomes H.
It is determined that the communication is DLC communication, and the HDLC communication method is adopted. Further, when the communication device 11 is on the activation side, by providing the time counting unit 116 that gives a time limit to the detection operation of the communication request detection unit 115, the response waiting time from the other party has a time limit. PIA if exceeded
Switched to the FS communication system.

Therefore, the link can be adaptively established for the HDLC communication and the PIAFS communication, and the data communication can be performed without considering the communication method of the communication partner. Further, even for the other party to be activated, which is operating in the PIAFS communication system that does not send a response to different communication requests, the PIAFS communication system can be automatically switched to establish a link.

In the above embodiment, the communication device 11
Describes an example in which the FLG pattern is first transmitted to establish a link with the other party, but even if the synchronization request frame is first transmitted in the operation of the PIAFS communication method, the other party It is possible to establish a link with. In this case, even if the other party is operating in the HDLC communication method, the communication apparatus 11 detects the FLG pattern from the other party by sending the FLG pattern to the communication apparatus 11, and the same HDLC communication as that of the other party. Switch to the system to realize link establishment.

The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

[0030]

As described above in detail, according to the present invention,
It is set in advance when the communication request for data communication is sent to the other party.
Even if the time limit is exceeded, the communication request from the other party
If it is not sent, the communication request of a different communication method is sent to the other party.
By sending it to the other party and proceeding with the link establishment procedure,
Enables data communication according to the communication method
In addition to this, the communication request from the other party is also received within the time limit.
If it is sent, the communication request sent from the other side is communicated.
By advancing the link establishment procedure according to the communication method,
Data communication is performed according to the communication method requested by the other party.
It is possible to

[Brief description of drawings]

FIG. 1 is a block configuration diagram showing an embodiment of a communication device according to the present invention.

FIG. 2 is a flowchart shown to explain the operation of the main control unit in the same embodiment.

FIG. 3 is a sequence shown to explain link establishment when the activation side and the activation side are in HDLC communication.

FIG. 4 is a sequence shown to explain link establishment when the initiating side is PIAFS communication and the activatable side is the communication device according to the present invention.

FIG. 5 is a sequence shown to explain link establishment when the activation side is the communication device according to the present invention and the activation side is PIAFS communication.

[Explanation of symbols]

11 ... communication device, 111 ... Line control unit, 112 ... PIAFS communication unit, 113 ... HDLC communication unit, 114 ... communication request sending unit, 115 ... Communication request detection unit, 116 ... time counting unit, 117: request determination unit, 118 ... time overrun, 119 ... Main control unit, 120 ... control bus, 20 ... communication line.

Claims (2)

(57) [Claims] 1. The same communication between the starting side and the started side.
By sending out requests and detecting these communication requests with each other,
First data communication by the first communication method for establishing a link
Communication between the communication means and the starting side and the activated side different from the first communication method
Has a request, and the activated side requests the communication from the activated side.
And activates the response to the detected communication request.
In the second communication method that establishes the link by sending to the
A second communication means for performing data communication and a communication request for data communication by the first communication method
The communication request transmitting means for transmitting to the side, and the communication request transmitting means according to the first communication method.
Measures the elapsed time from the point of sending a communication request for data communication
And time counting means for, the elapsed time measured by said time measuring means in advance
Time excess determination means for determining whether or not the set time limit is exceeded, and communication request detection means for detecting a communication request for data communication by the first or second communication method transmitted from the other party. And the other party based on the detection result of the communication request detecting means.
The communication method of the communication request sent from the side is the first communication
The time limit is exceeded by the request determination means and the time excess determination means for determining whether it is the system or the second communication method.
It is determined that there is not, and the phase is determined by the request determination means.
The communication method of the communication request sent from the hand side is the first communication.
If it is determined that the first communication method
The procedure for establishing a link by
The communication is controlled so that the time excess determination means
It is determined that the time limit has not been exceeded, and
The communication request sent from the other side by the request determination means.
It was determined that the desired communication method was the second communication method.
In the case of the second communication method sent from the other party,
By sending a response to the communication request to the other party,
The link by the second communication method as the activatable side
Proceed with the establishment procedure to perform data communication with the second communication means.
Control so that the time limit determination means limits the
If it is determined that the time has passed, the communication request sender
A communication request of the second communication method is sent at a stage
As a result, the link by the second communication method is used as the starting side.
Proceed with the establishment procedure to perform data communication with the second communication means.
A communication device comprising: a control unit for controlling the communication. 2. The same communication between the starting side and the started side.
By sending out requests and detecting these communication requests with each other,
First data communication by the first communication method for establishing a link
Communication between the communication means and the starting side and the activated side different from the first communication method
Has a request, and the activated side requests the communication from the activated side.
And activates the response to the detected communication request.
In the second communication method that establishes the link by sending to the
A second communication means for performing data communication and a communication request for data communication by the second communication method
The communication request transmitting means for transmitting to the side and the communication request transmitting means by the second communication method.
Measures the elapsed time from the point of sending a communication request for data communication
And time counting means for, the elapsed time measured by said time measuring means in advance
Time excess determination means for determining whether or not the set time limit is exceeded, and communication request detection means for detecting a communication request for data communication by the first or second communication method transmitted from the other party. And the other party based on the detection result of the communication request detecting means.
The communication method of the communication request sent from the side is the first communication
The time limit is exceeded by the request determination means and the time excess determination means for determining whether it is the system or the second communication method.
It is determined that there is not, and the phase is determined by the request determination means.
The communication method of the communication request sent from the hand side is the second communication.
If it is determined that the communication method is
When the link establishment procedure by the second communication method is advanced, the second
Control the communication means to perform data communication, and
It is determined by the excess determination means that the time limit has not been exceeded.
Separated from the other side by the request determination means
The communication method of the transmitted communication request is the first communication method.
If it is determined that the communication request transmission means
By sending the communication request of the first communication method,
The link establishment procedure by the first communication method is advanced, and the first
Control the communication means to perform data communication, and
It is determined that the time limit has been exceeded by the excess determination means.
In the case of communication, the communication request sending means uses the first communication method.
By transmitting the communication request of the first communication method
The link establishment procedure by the
A communication device, comprising: a control unit that controls to perform data communication.