JPH11191756A - Equipment and method for data communication with phs (r) - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively utilize a radio channel even when the amount of transfer data is extremely different on incoming and outgoing or the amount of transmission data is fluctuated with the passage of time by determining data transfer rate to establish a specified relation when the incoming and outgoing data transfer rate of respective line are defined as VU and VD and the number of channels to be used on each channel is defined as (n). SOLUTION: The data transmission rate is determined so as to establish the equality of 64n=VU+VD. The number (n) of channels to be used is dynamically changed corresponding to the required data transfer rate, and the total incoming/outgoing transmission rate is accelerated or decelerated. A PHS service system 30 is composed of a CS (radio base station) 2, ISDN exchange 3 and IWF 5. When a physical slot is used more than three speech channels for radio domain communication (communication between PS 1 and CS 2), the IWF executes the rearrangement of physical slots on an ISDN line required for access to an internet and access to an internet network 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data communication in a radio section using a PHS terminal, and more particularly, to a PHS-CS.
The present invention relates to a method for allocating a physical slot per line in an inter-wireless section and a data communication device for implementing the method.

[0002]

2. Description of the Related Art Conventionally, in PHS data communication, a data transfer rate of 32 Kbps has been used for both uplink and downlink in a wireless section. For example, PHS 32Kbps is included in Annex AH of Second Generation Cordless Telephone System Standard, Second Edition RCRSTD-28, "Method of Rate Matching Interwork at Interface Point (CS) with ISDN Compliant Network in Unrestricted Digital Services". 64 such as information transfer speed and ISDN
There is a description of the information elements used in the speed matching interwork of the information transfer rate of Kbps and the method thereof.

[0003]

However, this prior art has the following problems. The first problem is that P
In the HS, since the information transfer speed of one line in the wireless section is 32 Kbps at the maximum for both uplink and downlink, it is lower than the wired information transfer speed. The second problem is that in the data transfer service using PHS, the amount of data transferred in
Often it occurs due to extreme differences. As described above, since the information transfer rate in the wireless section of one line of the PHS is 32 Kbps for both uplink and downlink, if the downlink data transfer rate is much larger than the uplink data transfer rate, the downlink In spite of the fact that valid data is always transmitted, the amount of valid data transmitted on the uplink is very small. As a result, the time slot assigned to the uplink may not be used effectively.
The third problem occurs in the data transfer service using the PHS because the amount of transfer data changes with time. In the PHS, as described above, the information transfer rate of one line in the wireless section is up to 32 Kb in both uplink and downlink.
Since it is fixed to ps, once a line is secured, the physical slot allocated to the wireless section is maintained and maintained, even though there is no valid transfer data in a certain time zone, as a result , The physical slot may not be used effectively.

An object of the present invention is to efficiently use a wireless channel in data communication using a PHS even if the amount of transfer data is extremely different between uplink and downlink or the amount of transfer data varies with time. It is an object of the present invention to provide a data communication device and a data communication method which can perform the data communication.

[0005]

In order to solve the above-mentioned problems, a data communication method in a radio section between a PHS terminal and an ISDN radio base station according to the present invention is described. When the data transfer speed is VU and VD, and the number of used communication channels of each line is n, the expression ??
The data transmission rate is determined so that? 64n = VU + VD holds. In this way, by determining the data transmission rate, for example, by dynamically changing the number of used communication channels n according to the required data transfer rate, the total transmission rate of the uplink and downlink is increased, or , Can be lowered.

[0006] Further, the number of physical slots to be allocated in a predetermined direction of up or down per line in a wireless section is set to an integer value N which can be dynamically changed in accordance with a required data transfer rate, and the number of physical slots at the time of data communication is determined. The transmission speed in the direction is N ×
By setting the transmission rate to 32 Kbps, even when the amount of data transfer is extremely different between the uplink and the downlink, many physical slots can be allocated in a direction requiring a large amount of data transfer.

The above method is a method of allocating more physical slots to the downlink when more data transfer is required for the downlink than for the uplink, for example.
The same can be achieved with one physical slot. For example, when one frame is 5 ms, if one physical slot is transmitted every four frames in the upstream direction and three physical slots are transferred every four frames in the downstream direction, one physical slot is used. Thus, the amount of data transfer in the down direction can be made three times that in the up direction. A general description of this method is as follows.

[0008] One of the upward direction and the downward direction is defined as a first direction, the other direction is defined as a second direction, an integer value representing the number of frames is m, and a positive integer value smaller than m is p.
In this case, data is transferred by using one physical slot in the first direction of at least one of the used communication channels p times every m frames, and one physical slot in the second direction is used for the m frames. The remaining mp times are used to transfer data.

A data communication device for implementing the above method is configured as follows. A radio base station for transmitting and receiving data to and from the PHS terminal by radio;
In order to transfer the data to the Internet when data is transmitted using three or more physical slots simultaneously in a wireless section communication between the PHS terminal and the wireless base station with the ISDN exchange connected by the SDN subscriber line, Perform the necessary rearrangement of physical slots on the ISDN subscriber line and transfer to the Internet network,
Conversely, there is provided a data communication device having an interworking unit for executing reading of data from the Internet network and rearrangement of physical slots necessary for connecting the read data to an ISDN subscriber line, The radio base station, when a call channel addition request is issued from the PHS terminal with respect to a line in a radio section currently being communicated, determines whether or not there are a number of empty channels corresponding to the addition request,
If there are a number of available channels corresponding to the addition request, the available channels are additionally allocated to the PHS terminal, and the used physical slots of all communication channels of the line including the additionally allocated communication channels are set to the ISDN. It is assigned to a subscriber line and transmitted to the ISDN exchange.

[0010] The radio base station includes a digital radio transmission / reception unit that performs radio communication with a PHS terminal, a digital modulation / demodulation unit that modulates a data signal transmitted to the PHS terminal and demodulates a data signal received from the PHS terminal. A buffer section, a time division switch section, an ISDN interface section for connecting the radio base station to an ISDN subscriber line, and an information processing device for controlling the respective sections. The data signal demodulated by the modem unit is held, and the data signal output from the time division switch unit for transmission to the PHS terminal is held, and the data signal held by the control of the information processing device is output. A time-division switch unit, which controls the data signal read from the buffer unit under the control of the information processing device, according to I The information processing apparatus multiplexes the data signal into the ISDN interface format specified for the DN subscriber line, outputs the multiplexed data to the ISDN interface unit, and demultiplexes the data signal input from the ISDN interface unit and passes it to the buffer unit. When there is a call channel addition request for a line in a wireless section where the PHS terminal is currently talking, it is determined whether or not there are a number of available channels corresponding to the addition request. If there is a vacant channel, the vacant channel is additionally allocated to the PHS terminal, and the physical slots used for all the communication channels of the line including the additionally allocated communication channel are allocated to the ISDN subscriber line. , In the order of its assigned physical slots,
A data signal is read from the buffer unit.

[0011] The interworking unit includes an interface unit for connecting transmission / reception data signals to and from the ISDN exchange, a buffer unit, a time division switch unit, an interwork control unit, and an ISDN network and the Internet for each line. The buffer unit holds the output of the interface unit or the time division switch unit, and outputs the held data signal under the control of the interwork control unit.The time division switch unit
The data signals read from the buffer unit under the control of the interwork control unit are rearranged to match the Internet protocol and output to the Internet via a dial-up router, or input from the Internet via a dial-up router. The data signal is rearranged so as to conform to the protocol of the ISDN network and output to the buffer unit. The interwork control unit controls the input / output operation of the interface unit and converts the data signal mapped by the radio base station into the Internet. The buffer unit and the time-division switch unit are controlled so as to convert the data signal into a format that the terminal receives or to convert a data signal input from the Internet into a format that the ISDN receives.

[0012]

Next, embodiments of the present invention will be described with reference to the drawings. As described above, the data transmission rate in the PHS wireless section is fixed at 32 Kbps.
FIG. 1 shows a PS based on such a fixed transmission rate of 32 Kbps.
FIG. 2 is a diagram showing a prior example of a method for designating a physical slot for CS wireless section communication, and FIG. 2 is a diagram showing a method for designating a physical slot for CS-ISDN exchange communication for exchanging data signals with the wireless section in FIG. is there.

FIG. 1 shows an example of a radio section communication physical system in which four lines of first, second, third, and fourth communication channels (1stTch, 2ndTch, 3rdTch, and 4thTch) are used for communication. It is an example of designation of a slot. Each line secures a data transfer rate of 32 Kbps for both upstream and downstream.

[0014] Of the four traffic channels (Tch) allocated to the radio section, the first traffic channel has a downlink slot of slot 1 (1 indicates a slot number. Hereinafter, slot k is used in each frame (5 ms)). The slot 5 is assigned to the upstream slot. In the second traffic channel, slot 2 is assigned to the downlink slot and slot 6 is assigned to the uplink slot,
The third and fourth traffic channels are slots 3 and 4 for the downlink slot, slot 7 and the uplink slot respectively.
8 has been assigned. The data transmission speed in each slot is 32 Kbps.

As shown in FIG. 1, the specification of a physical slot for a wired section between a CS-ISDN exchange connected to a wireless section in which a communication physical slot is specified is performed when two 2B + D subscriber interface lines are used. Is performed as shown in FIG.

FIG. 2 shows the relative allocation of the physical slots for radio zone communication allocated in FIG. 1 on the CS-ISDN 2B + D subscriber interface line. The number in the slot corresponds to the communication physical slot number in the PS-CS radio section. Data transmission speed 32Kbp in wireless section
Each slot of s is allocated to half of the B channel at a data transmission rate of 64 Kbps for communication between CS-ISDN exchanges. In FIG. 2,-indicates a blank physical slot portion that is not allocated.

In actual data communication using the PHS, the amount of transfer data is generally extremely different between up and down, or the amount of transfer data fluctuates with time. The present invention provides a P to which such a service is applied.
The present invention relates to an ISDN exchange accommodating HS subscribers. According to the present invention, as described below, the number of communication channels in a radio section and the timing of allocating uplink and downlink communication channels for data transfer are changed according to the data transfer capacity required for data communication using a PHS terminal. The transmission speed at the time is set to N × 32 Kbps so that the wireless channel can be used efficiently.

FIG. 3 is a diagram showing the basic configuration of the communication system according to this embodiment. 6, 7, 8, 9, 10, 1
FIGS. 1, 12, and 13 are diagrams for explaining a method of allocating a physical slot for wireless section communication to a BRI interface line based on the present invention.

Referring to FIG. 3, a PHS service system 30 includes a CS2 (radio base station), an ISDN exchange 3,
It is constituted by IWF5. CS2 (wireless base station) is connected to ISDN exchange 3 through an ISDN subscriber line. PS1 in the service area of CS2
(PHS terminal). PS1 (PHS terminal)
Transmission from PS1 and reception to PS1 are performed by wirelessly transmitting and receiving data to and from CS2. CS2 connects the transmission path of the wireless section to ISDN. IWF5
When three or more physical slots are used simultaneously for wireless section communication (communication between PS1 and CS2), rearrangement of physical slots on the ISDN line necessary for access to the Internet and access to the Internet network 6 are performed. I do. Conversely, the Internet network 6
, And rearrangement of the physical slots required to connect the read data to the ISDN line.

The data communication partner of PS1 is ISDN BR
I (ISDN basic interface), the ISDN exchange 3 transmits data from PS1 to NT
(Network termination) 4, TA (Terminal adapter)
A PC (Personal Computer for ISDN) 42 is connected through 41. Data transfer speed with PS1 is 64
If it is higher than Kbps, the ISDN exchange 3
(Interwork function, a function to convert the mutual protocol so as to enable interconnection between networks with different protocols.In this embodiment, the data mapped by CS is converted into a form that can be received by the partner terminal. Output function) 5 to the Internet network 6.

FIG. 4 is a block diagram for explaining the configuration of the CS 2 of the present embodiment. The radio base station CS2 of the present embodiment includes:
It has a digital radio transceiver 21, a digital modulation / demodulation unit 22, a buffer unit 23, a time division switch unit 24, an ISDN interface unit 25, and a microprocessor 26 for controlling these. Among them, the digital radio transceiver 21, the digital modulation / demodulation unit 22, and the ISDN interface unit 25 have the same configuration and function as the corresponding components of the conventional radio base station.

The buffer unit 23 and the time division switch unit 24
Is to rearrange the physical slots allocated to each line in the wireless section into the format of the 2B + D basic interface specified by ISDN, or
A physical slot is generated from the 2B + D basic interface line to carry the data signal to be transmitted to the number 1 Tch requested by PS1.

The microprocessor 26 includes a buffer unit 23 and a time-division switch unit 2 according to the data transfer speed.
4 to allocate a physical slot in the wireless section to the 2B + D interface line, or convert a data signal (hereinafter referred to as a BRI signal) on the 2B + D interface line into a physical slot for wireless section communication. A control program describing a control procedure executed by the microprocessor 26 is recorded on a recording medium (not shown).

The radio signal transmitted from PS1 to CS2 is received by digital radio transceiver 21 of CS2 and then demodulated by digital modulation / demodulation unit 22. The demodulated received signal is held by the buffer unit 23, read out under the control of the microprocessor 26, multiplexed by the time division switch unit 24 at slot timing conforming to the BRI, and passed through the ISDN interface unit 25 to the ISDN exchange 25. 3 is connected.

Conversely, the BRI signal input from the ISDN exchange 3 to the radio base station CS2 through the ISDN interface unit 25 is demultiplexed by the time division switch unit 24 and then stored in the buffer unit 23. The data signals stored in the buffer unit 23 are read out in the order specified by the microprocessor 26, are modulated by the digital modulation / demodulation unit 22, and then use the Tch assigned to the PS1 at the request of the PS1. The data is wirelessly transmitted to the PS1 through the digital wireless transceiver 21.

FIG. 5 is a block diagram illustrating the configuration of the IWF 5. The IWF 5 has a function of converting a protocol between the PHS service system 30 and the Internet 6 having different protocols in order to connect the two.

The IWF 5 includes a DTI 51, a buffer unit 52, a time division switch 53, an IWF control unit 56, and a dial-up router 54. A DTI (Digital Transmission Interface or Digital Trunk) 51 interfaces data transmission and reception between the IWF 5 and the ISDN exchange 3. The buffer unit 52 is DT
The output of I51 or the time division switch unit 53 is held.
The time division switch 53 converts the data signal read from the buffer unit 52 under the control of the IWF control unit 56 so as to conform to the Internet protocol, and outputs the data signal to the Internet via the dial-up router 54.
Alternatively, a data signal input from the Internet via the dial-up router 54 is converted so as to conform to the protocol of the ISDN network and output to the buffer unit 52. Dial-up router 54 relays between the ISDN network and the Internet. The IWF control unit 56 controls the input / output operation of the DTI 51,
The buffer unit 52 and the time division switch 53 are controlled to receive the data signal mapped by CS2 at the partner terminal (in this embodiment, the Internet terminal) (return the data to the order of the data transmitted by PS1), Alternatively, the data signal input from the Internet
It is converted to the form that the DN receives ((2B + D) basic interface). This operation is an operation of converting a data signal from a format conforming to TCP (Transmission Control Protocol) to a format conforming to IP (Internet Protocol) or vice versa.

A data transmission / reception signal from the ISDN exchange 3 is transmitted to a DTI 51, a buffer 52, a time-division switch 5,
3 and connected to the dial-up router 54 for each telephone line. The dial-up router 54 connects data transmitted and received with the PS1 to the Internet. The IWF control unit 56 controls the buffer unit 52 and the time-division switch unit 53, and returns the data exchanged in CS2 to the data transmitted by PS1 in order and connects to the dial-up router 54. A control program describing a control procedure executed by the IWF control unit 56 is recorded on a recording medium (not shown).

FIG. 6 shows a method of simultaneously assigning two traffic channels as a method of specifying a physical slot for communication between the radio stations CS2 and PS1 configured as described above. FIG. 8 shows a method for simultaneously allocating three traffic channels, and FIG. 10 shows a method for simultaneously allocating four traffic channels.

FIG. 6 shows a first embodiment of a method for designating a physical slot for PS-CS radio section communication.
It is a designation example of a wireless section communication physical slot when performing communication of three lines using four communication channels of a second communication channel, a third communication channel, and a fourth communication channel.

As is apparent from a comparison of FIG. 6 with the physical slot designation method of FIG. 1, in the physical slot assignment method of FIG. 6, the first line uses the first and second two calls of FIG. Using channels (1stTch, 2ndTch)
The downlink slot 1 of the first traffic channel, the downlink slot 2 and the uplink slot 6 of the second traffic channel are allocated to the downlink slot, the uplink slot 5 of the first traffic channel is directly allocated to the uplink slot, and the downlink 96 Kbps and the uplink 32 are allocated.
It achieves Kbps data transfer speed. The second line is the third
Using a communication channel, secure a data transfer rate of 32Kbps down and 32Kbps up, use the fourth communication channel for the third line,
A data transfer speed of 32Kbps for downlink and 32Kbps for uplink is secured.

FIG. 7 shows the relative assignment of the physical slots for wireless section communication allocated in FIG. 6 to two CS-ISDN 2B + D subscriber interface lines. Also in this case, the number in the slot corresponds to the communication physical slot number in the PS-CS wireless section. 64Kbp of FIG.
s Downlink channel B1 has slots 1 and 2 in the radio section.
2, and the slot 6 in the wireless section is assigned to the downlink channel B2. Further, only slot 5 in the radio section is allocated to the channel B1 as the uplink slot. C of uplink slots 3 and 4 and downlink slots 7 and 8 in the PS-CS radio section
The assignment to the S-ISDN 2B + D subscriber interface line is the same as in FIG.

FIG. 8 shows a second embodiment of the method of designating the physical slot for the PS-CS wireless section communication, in which the first, second, third and third physical slots are designated.
This shows designation of a wireless section communication physical slot in the case where communication of two lines is performed using four channels of the fourth communication channel. The first line includes a first traffic channel (using slot 1 for downlink and using slot 5 for uplink), a second traffic channel (using slot 2 and slot 6 for downlink), and a third traffic channel (using slot 1 and slot 6). 3, use slot 7 for downlink), secure a data transfer rate of 160 Kbps downlink and 32 Kbps uplink, use the fourth communication channel (downlink slot 4 and uplink slot 8) for the second line, and download 32 Kbps uplink 32
Ensure Kbps data transfer speed.

FIG. 9 shows the relative allocation of the physical slots for wireless section communication allocated in FIG. 8 to two CS-ISDN 2B + D subscriber interface lines. Also in this case, the number in the slot corresponds to the communication physical slot number in the PS-CS wireless section. As shown in FIG. 9, in the present embodiment, physical slots 1 and 2 for radio section communication and slot 6 are allocated to channels B1 and B2, respectively, and the channels of uplink slots of the same subscriber interface line are allocated. B1 is assigned a physical slot 5 for wireless communication. Channel B3 of the downstream slot of the second subscriber interface line
Are assigned physical slots 3 and 7 for wireless section communication,
The physical slots 4, 8 of the second line in the wireless communication section are allocated to the channel B4 of the second subscriber interface line. Therefore, the present embodiment is an example in which the first line of the wireless communication section uses two subscriber interface lines in the wired section between CS and ISDN.

FIG. 10 is a diagram showing a third embodiment of the method of specifying a physical slot for PS-CS wireless section communication. The present embodiment is an example of designating a wireless section communication physical slot when one line communication is performed using the first, second, third, and fourth communication channels. In the present embodiment, a first communication channel (slot 1 is used for downlink communication and slot 5 is used for uplink communication) and a second communication channel (slots 2 and 6 are both used for downlink communication) for one line. Using a third communication channel (slots 3 and 7 are used for downlink communication) and a fourth communication channel (slots 4 and 8 are used for downlink communication), a data transfer rate of 224 Kbps for downlink and 32 Kbps for uplink is secured. ing.

FIG. 11 shows the relative allocation of the physical slots for wireless section communication allocated in FIG. 10 to two CS-ISDN 2B + D subscriber interface lines. Also in this case, the number in the slot corresponds to the communication physical slot number in the PS-CS wireless section. In the present embodiment, one line in the wireless section is allocated to two CS-ISDN subscriber interface lines. First and second channels B of downlink slots of a first subscriber interface line
Slots 1 and 2 and slot 6 of the radio section are assigned to 1, 1 and B2, respectively, and only slot 5 is assigned to channel B1 of the upstream slot of the same subscriber interface line. Also, the channels B3 and B3 of the downlink slot of the second subscriber interface line
4, slots 3 and 4 and slots 7 and 8 of the wireless section are assigned, respectively, and no uplink slot is assigned to the upstream slot of the same subscriber interface line.

FIG. 12 shows a fourth embodiment of a method for specifying a physical slot for PS-CS wireless section communication. In this embodiment, only one channel is assigned to each line. However, in the slot assignment of the first traffic channel, slot 1 and slot 5 are used for downlink, of which slot 5 is used three times every 20 ms and 56
Kbps is secured, and the upstream uses slot 5 once every 20 ms to 8 Kbps. This embodiment uses only one channel for each line and reduces the downstream data transfer rate to 56.
Kbps. When this method is further generalized, when the uplink and downlink data transfer speeds are VU and VD, and the number of used communication channels is n, the data can be combined with the previous embodiment so that the equation ??? 64n = VU + VD holds. Transmission speed can be determined.

FIG. 13 shows the relative allocation of the physical slots for wireless section communication allocated in FIG. 12 on two CS + ISDN 2B + D subscriber interface lines. Also in this case, the number in the slot corresponds to the communication physical slot number in the PS-CS wireless section. In the first subscriber interface line of FIG. 13, the allocated portion of the slot 5 allocated to the channel B1 of the downstream slot is used three times every 20 ms, and the remaining one is blank. Conversely, the allocation of the upstream slot to slot 5 in channel B1 is used once every 20 ms when the allocation of the downstream slot to slot 5 becomes blank. The relative allocation of the wireless section communication physical slots to other lines is the same as in the example of FIG. In this way, in PHS data communication, the data transmission speed is temporally changed according to the transfer data capacity, and the wireless channel can be efficiently used as a whole.

Next, the PHS data communication system of FIG. 3 will be described with reference to control sequence diagrams of FIGS. FIG. 14 and FIG. 15 show that a large amount of data transfer requests were issued in the downlink direction during the 32 Kbps uplink data communication using only the first communication channel in the wireless section at the start of PHS data communication. When the uplink slot of the second, third, and fourth traffic channels is used as the downlink slot using the traffic channel and the data transfer of the downlink 224 Kbps and the uplink 32 Kbps is performed, and then the uplink and the downlink both return to the 32 Kbps data communication. 3 shows a control sequence diagram of FIG.

In FIG. 14, PS1 is a control channel (Cch) as in the case of normal voice in data communication.
To request CS2 to establish a link channel.
When PS1 receives the link channel assignment signal from CS2, it uses the assigned Tch (here, the first communication channel) to transmit and receive a synchronization burst, transmit SABM from PS1 to CS1, and UA (input) from CS1 to PS1. After the transmission of the designation of the output device, the link of Tch is established. After the link is established, communication is performed using the first Tch after transmission / reception of call setting, call setting acceptance, secret key setting, authentication request, authentication response, call, and response signals between PS1 and CS2. If there is a large amount of data transfer request from the communication partner during communication, PS1 sends Tch to CS2 on the first Tch.
Request additional. In response to the Tch addition request from PS1, if there is a usable Tch, CS2 allocates additional Tch to PS1 and, after transmitting the idle TCH, starts communication using all the allocated Tch.

In the control sequence shown in FIG. 15 subsequent to the control sequence shown in FIG. 14, when a large amount of data communication between PS1 and CS2 is completed, PS1 transmits a Tch deletion request to CS2, and the Tch deletion from CS2 to PS1 is performed. After the response is sent, the communication returns to the first communication of the first Tch only. In this way, the usage T
Increase or decrease ch.

FIG. 16 is a flowchart describing the operation of PS1. The required data transfer speed (required data transfer amount / data transfer time) received from CS2 is compared with a specified value m of PS1 (step A1). Further, a request for additional allocation of (N-1) Tch is made (step A2), and an additional allocation of (N-1) Tch is received (step A3).
The LE reception is determined (step A4). When the IDLE is received, the communication using the NTch is started (A5). If IDLE is not received,
The determination in step A4 is repeated until IDLE is received.

The required data transfer rate received from CS2 in the flowchart of FIG. 16 is compared with a prescribed value m of PS1 (step A1). If the required data transfer rate is smaller than m, the data is currently in use. It is determined whether or not the number of Tch is plural N (step A6). If the NTch is in use, a request for deletion of (N-1) Tch is made to CS2 (step A7), and whether the deletion response OK is received. Is determined (A8). When the delete response OK is received, (N
-1) Release Tch (step A9) and start communication using 1Tch (A10). In step A6,
If the number of currently used channels is one, the state returns to the normal state. If no deletion response OK is received in step A8, the deletion response OK is received.
Is repeated until step S8 is received.

If no additional allocation is received in step A3, it is determined whether additional allocation rejection has been received (step A11). When the additional allocation rejection by CS2 is received, the process returns to step A1 (return to normal operation). If the additional allocation rejection is not received, step A11 is performed until the additional allocation rejection is received.
Is repeated.

FIG. 17 is a flowchart describing the operation of CS2. When there is a request to add (N-1) Tch from PS1 (step B1), an empty Tch becomes (N-
1) It is determined whether there is more than the above (step B2). Empty Tc
If h is (N-1) or more, the ISDN exchange sends (N
-1) Make a request to add a communication channel (step B)
3). If the additional response is OK (step B4), PS1
Responds to (N-1) Tch additional allocation (step B5), and requests the ISDN exchange to add an (N-1) communication channel (step B6). (N-1) After IDLE transmission using Tch (step B7), communication using NTch is started (step B8).

In the flowchart of FIG.
When there is a request to delete (N-1) Tch (step B9), a request to delete (N-1) traffic channels is made to the ISDN exchange (step B10), and (N-) is sent to PS1.
1) After the Tch deletion response (step B11), (N-1)
The Tch is released (step B12), and communication using one Tch is started (step B13).

In step B2, the empty Tch becomes (N-
1) If not, and if ISD in step B4
If there is no additional response OK from the N exchange, CS2 sets P
Sends (N-1) additional call channel rejection to S1
(Step B14) Return to the normal operation state. Also, C
In S2, the normal operation state is maintained when there is no request for addition of (N-1) Tch from PS1 and no request for deletion of (N-1) Tch (when the determination results in steps B1 and B9 are NO). Of course you do.

[0048]

The present invention has the following effects. 1) Since the number of physical slots allocated to each line in the wireless section can be dynamically changed according to the required data transfer rate, data can be transferred at a high speed. As a result, PHS
The data transfer connection time is shortened, and the data communication time is shortened. 2) In PHS data communication, the physical slot in the wireless section between the PHS-CS is effectively used by changing the uplink / downlink physical slot transfer timing and allocating more physical slots to the one with larger uplink / downlink data transfer capacity. be able to. 3) In PHS data communication, invalid data transmission using physical slots in a PHS-CS wireless section can be reduced by temporally increasing or decreasing the number of wireless slots according to the amount of transfer data.

[Brief description of the drawings]

FIG. 1 is a prior example of a method of specifying a physical slot for PS-CS wireless section communication.

FIG. 2 is a diagram showing the relative allocation of physical slots for wireless section communication allocated in FIG. 1 on a CS-ISDN 2B + D subscriber interface;

FIG. 3 is a diagram illustrating the basic configuration of an embodiment of a communication system according to the present invention.

FIG. 4 is a block diagram illustrating a configuration of CS2 of the embodiment in FIG. 3;

FIG. 5 is a block diagram illustrating a configuration of an IWF 5 according to the embodiment in FIG.

FIG. 6 is a first embodiment of a method of specifying a physical slot for PS-CS wireless section communication.

FIG. 7 is a diagram showing relative allocation of physical slots for wireless section communication allocated in FIG. 6 on the CS-ISDN 2B + D subscriber interface;

FIG. 8 is a second embodiment of a method for specifying a physical slot for PS-CS wireless section communication.

9 is a diagram showing the relative allocation of the physical slots for wireless zone communication allocated in FIG. 8 on the CS-ISDN 2B + D subscriber interface.

FIG. 10 is a diagram showing a third embodiment of a method for specifying a physical slot for PS-CS wireless section communication.

11 is a diagram showing the relative allocation of the physical slots for wireless zone communication allocated in FIG. 10 to two CS-ISDN 2B + D subscriber interface lines.

FIG. 12 shows a fourth embodiment of a method for specifying a physical slot for PS-CS wireless section communication.

13 is a diagram showing relative allocation of physical slots for wireless section communication allocated in FIG. 12 over two CS-ISDN 2B + D subscriber interface lines.

FIG. 14: At the start of PHS data communication, only the first communication channel in the wireless section is used, and a large amount of data transfer request is made in the down direction during 32 Kbps uplink data communication, so four communication channels are used from the middle. A control sequence diagram in the case where the uplink slots of the second, third, and fourth traffic channels are used as downlink slots, data transmission of downlink 224 Kbps and uplink 32 Kbps is performed, and then uplink and downlink both return to 32 Kbps data communication. Is shown.

FIG. 15 is a control sequence diagram following FIG. 14;

FIG. 16 is a flowchart describing the operation of a PHS terminal.

FIG. 17 is a flowchart describing the operation of a radio base station.

[Explanation of symbols]

 Reference Signs List 1 PHS terminal (PS) 2 Radio base station (CS) 3 ISDN exchange 4 Network termination unit (NT) 5 Interwork unit (IWF) 6 Internet network 21 Digital radio transmission / reception unit 22 Digital modulation / demodulation unit 23 Buffer unit 24 Time division switch unit Reference Signs List 25 ISDN interface unit 26 Microprocessor 30 PHS service system 41 Terminal adapter (TA) 42 Personal computer (PC) for ISDN 51 Digital trunk (DTI) 52 Buffer unit 53 Time division switch unit 54 Dial-up router 56 IWF control unit

Claims (9)

[Claims] 1. A data communication method in a wireless section between a PHS terminal and an ISDN wireless base station, wherein the upstream and downstream data transfer rates of each line are VU and VD,
When the number of used communication channels of each line is n, the expression ??? 6
A data communication method by PHS, wherein the data transmission rate is determined so that 4n = VU + VD is satisfied. 2. The method according to claim 1, wherein the number n of used communication channels is dynamically changed according to a required data rate. 3. The number of physical slots to be allocated in a predetermined direction of uplink or downlink per line of a wireless section is set to an integer value N which can be dynamically changed according to a required data transfer rate, The transmission speed in this direction is N × 3
3. The method according to claim 1, wherein the method is 2 Kbps. 4. An up direction or a down direction is defined as a first direction, the other direction is defined as a second direction, an integer value representing the number of frames is m, and a positive integer value smaller than m is p. When one physical slot in the first direction of at least one of the used traffic channels is used p times for every m frames to transfer data, and one physical slot in the second direction is The method of claim 1, wherein data is transferred using the remaining mp times of the frame. 5. A radio base station for transmitting and receiving data to and from a PHS terminal by radio, an ISDN exchange connected to the radio base station by an ISDN subscriber line, and a radio section between the PHS terminal and the radio base station. When data is transmitted using three or more physical slots simultaneously for communication, rearrangement of the physical slots on the ISDN subscriber line necessary for transferring the data to the Internet, and transfer to the Internet network are performed. ,vice versa,
What is claimed is: 1. A data communication apparatus having an interworking unit for reading data from the Internet network and rearranging physical slots necessary for connecting the read data to an ISDN subscriber line. When the PHS terminal issues a call channel addition request for a line in a wireless section currently in communication from the PHS terminal, the station determines whether or not there are available channels corresponding to the addition request, and falls under the addition request. When there are a number of available channels, the available channels are additionally allocated to the PHS terminal, and physical slots used for all communication channels of the line including the additionally allocated communication channels are allocated to the ISDN subscriber line. A data communication device for transmitting to the ISDN exchange. 6. The radio base station, comprising: a digital radio transmission / reception unit that performs radio communication with a PHS terminal; and a digital modulation / demodulation unit that modulates a data signal transmitted to the PHS terminal and demodulates a data signal received from the PHS terminal. , A buffer unit, a time division switch unit, and an ISDN
An ISDN interface unit connected to a subscriber line, and an information processing device for controlling each of the units; the buffer unit holds a data signal transmitted from a PHS terminal and demodulated by a digital modulation / demodulation unit; Holding the data signal output from the time division switch unit for transmission to the terminal, outputting the data signal held by control of the information processing device, the time division switch unit controlling the information processing device The data signal read from the buffer unit by I
Multiplexing the data signal into an ISDN interface format defined for the SDN subscriber line, outputting the multiplexed data signal to the ISDN interface unit, and multiplexing and demultiplexing the data signal input from the ISDN interface unit to the buffer unit; Determines whether there is a free channel number corresponding to the addition request when the PHS terminal requests a communication channel addition with respect to the line of the wireless section where the PHS terminal is currently talking, and determines whether the number corresponds to the addition request. If there is an available channel, the additional channel is allocated to the PHS terminal, and the physical slots used for all the communication channels of the line including the additionally allocated communication channel are allocated to the ISDN subscriber line. Sometimes, data signals are sent from the buffer unit in the order of the assigned physical slots. The data communication device according to claim 5, wherein the data communication device reads the data. 7. The interworking unit includes: an interface unit for connecting transmission / reception data signals to / from an ISDN exchange; a buffer unit; a time division switch unit; an interwork control unit; A buffer that holds the output of the interface unit or the time-division switch unit, and outputs the held data signal under the control of the interwork control unit; The switch unit rearranges the data signals read from the buffer unit under the control of the interwork control unit so as to conform to the Internet protocol and outputs the data signals to the Internet via a dial-up router, or via a dial-up router. Data entered from the Internet The interwork control unit controls the input / output operation of the interface unit and outputs the data signal mapped by the radio base station. 6. The buffer unit and the time-division switch unit are controlled so as to convert to a form received by the terminal on the Internet side or to convert a data signal input from the Internet side to a form received by the ISDN.
Or the data communication device according to 6. 8. A data communication apparatus comprising: a radio base station for transmitting and receiving data to and from a PHS terminal by radio; and an ISDN exchange connected to the radio base station and an ISDN subscriber line, wherein the PHS terminal and the radio A control program for controlling the number of communication channels used for a radio link with a base station, the control program comprising:
When there is a call channel addition request from the terminal, it is determined whether or not there are a number of free channels corresponding to the addition request. The PHS terminal is made to perform additional assignment, and the physical slots used for all communication channels of the line including the additionally assigned communication channel are allocated to the ISDN subscriber line and transmitted to the ISDN exchange. If there are no free channels,
A recording medium storing a control program for rejecting an additional allocation request of the PHS terminal. 9. A radio base station for transmitting and receiving data to and from a PHS terminal by radio, an ISDN exchange connected to the radio base station by an ISDN subscriber line, and a radio section between the PHS terminal and the radio base station. When data is transmitted using three or more physical slots at the same time for communication, the physical slots on the ISDN subscriber line are rearranged and the data is transferred to the Internet, which is necessary for transferring the data to the Internet. Conversely, a data communication device having an interworking unit for reading data from the Internet network and rearranging the physical slots required to connect the read data to the ISDN subscriber line. A control program for controlling an interwork between the ISDN exchange and the Internet network. Thus, when the control program inputs the data signal mapped by the radio base station to the internetwork unit, the control program converts the data signal into a form to be received by the Internet terminal, and when the data signal is input from the Internet, And a control medium for recording a control program for converting the data signal into a form to be received by ISDN.