CA2073093C - Band management system in communication - Google Patents
Band management system in communicationInfo
- Publication number
- CA2073093C CA2073093C CA002073093A CA2073093A CA2073093C CA 2073093 C CA2073093 C CA 2073093C CA 002073093 A CA002073093 A CA 002073093A CA 2073093 A CA2073093 A CA 2073093A CA 2073093 C CA2073093 C CA 2073093C
- Authority
- CA
- Canada
- Prior art keywords
- band
- band value
- terminal equipment
- value
- network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L12/5602—Bandwidth control in ATM Networks, e.g. leaky bucket
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5629—Admission control
- H04L2012/5631—Resource management and allocation
- H04L2012/5632—Bandwidth allocation
Abstract
The invention relates to a technology with which a call process, a band setting process in particular, from a unit of terminal equipment to a network can be effectively performed. In a communication system, a communication band required by a unit of terminal equipment is secured by transmitting a SETUP message to a network from the terminal equipment, as in the case of a call procedure in B-ISDN, etc. When a call is made by the communication control unit of the terminal equipment connected to the network, if the securing of a band in the network is impossible the call is cut off. However, if the band area in the network is insufficient for an initial band value stored in the SETUP message, a revised band value is produced by subtracting a certain value from the initial band value, and a SETUP message with the revised band value is retransmitted to the network.
Description
BACKGROUND OF' T~E INVENTION
The present invention relates to an efEective technology applied to a communication system in which a communication band necessary for a unit o~ terminal equipment can be secured by transmitting a call control message (SETUP message) to a network from the terminal equipment as in the case of a call procedure in B-ISDN, etc.
In the B-ISDN network, various types of terminal equipment are connected with one communication line through the Network Termination (NT). As for the types of terminal equipment, there are telephones, facsimiles, computer data terminals, video terminals, telex, etc., and it is possible to use a number oE
these terminals a-t -the same time.
In this B-ISDN Network, when the service ls requested from the terminal, the communication starts aEter a network secures the communication band. For example, it is mentioned from ~
column 3 line 47 to column 4 line 27 in USP 4,704,716 that a .
signal, i.e. SETUP message, for requesting the width of -the band ;
is sent from a terminal, and then the network secures the adequate width of the band, and connects the communication line.
The width of the band required to communlcate depends on the type oE terminal. A terminal which contains much data requires a wide band and, on the other hand, in the case oE a terminal containing little data, a narrow band is suEficient.
When a SETUP message is transmitted to the network from a unit oE terminal equipment, if securing a band setting in the network according to the informa-tion element of the message is ~
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.~
~ .
-:
:
, :: : ... , - :
.
found to be impossible, the call procedure has to he repeated.
secause o~ thisl much time is spent for the call process itsel~, thereEore, resulting in lower communication efE.ic:i0ncy which is of concern.
SUMMARY OF THE INVENTION
The above-ment,ioned problems are solved by ~he present invention. An object of the invention is to offer a technology which executes eEfectively a call process, a band setting process in particularr to a network from a unit oE terminal equipmen-t~
Therefore, in accordance with one aspect of the invention, there is provided a band managing method in a communication system having terminal equipment connected to a communication network comprising the steps of: (a) transmitting a first message storing an initial band value to be used by the terminal equipment from the terminal equipment to the network;
(b) comparing the initial band value Bl oE the terminal equipment and a band value B2 of available band area of the network; (c) transmitting a call control message indicating a call setting to . ' the terminal equipment when the result of the comparison is Bl C B2; (d) transmitting a call control message indicating no =
usable band to the termi.nal equipment when the result o:E the comparison ls B2 = 0; (e) transmitti.ng a call control message indica-ting lack of usable band to the terminal equipment when the result of the comparison is Bl >B2 >0; (f) cutting off the call when the terminal equipment has received the call control message indicati.ng no band to use; and (g) calculating a revised band value B3 which is less than the band value B2, storing the revised .~' .
.'~1 band value B3 in the Elrs~ message and retransmitting the :Eirst message to the network.
According to another aspect oE the invention, there is provided a band managing syste~ in a communication system having terminal equipment connected to a communication network comprising: (a) call means for storing an initial band value Bl to be used by the terminal equipment ln a :Eirst message and transmitting the first message -to the network; (b) band comparing means for comparing the initial band value Bl of -the terminal equipment and a band value B2 of available band area o:E the network; tc) response means ~or transmitting a call control message indicating call se-tting to the terminal equipment when the result o~ the comparison is Bl ~B2, transmit-ting a call control message indicating no band to use to the terminal equipment when the result of the comparison is B2 = 0 and transmitting a call control message indica-ting insufficient band value to use to the terminal equipment when the result of the comparison is Bl~ B2 ~0;
and (d) communication control means for cutting oE~ the call when the terminal equipment receives the call control message indicat-ting no usable band, calculating a revised band value B3 which isless than the band value B2, storing the revised band value B3 in the :Eirst message and transmitting the :Eirst message to the network. ~.
According to a ~urther aspect oE the invention, there is provided a terminal equipment being connected to a communication network comprising: (a) call means ~or storing an initial band value to be used by the terminal equipment in a SETUP message - :, . . : .. .
and transmitting the SETUP message to the network; and (b) communication control means for controlling a call procedure of the call means, cutting o~f the call procedure in the case of receiving a call control message indicating no usable band, calculating a revised band value B3 which is less than the band value B2, storing the revised band value B3 in the SETUP message and transmittiny the SETUP message to the network.
According to a still ~urther aspect of the invention, there is provided a swi-tching system in a communication system having termina] equipment connec-ted to a communication network comprising: (a) band comparing means for comparing the initial band value Bl of the terminal equipment and a band value B2 o-E
available band area o~ the network; and (b~ response means for transmitting a call control message Eor a call setting to the terminal equipment when the result of the comparison is Bl <B2, transmitting a call contro] message indicating no band to use to the terminal equipment when the result of the comparison is B2 = 0 and transmitting a call control message indlcating insufficient band value to use to the terminal equipment when the result of the comparison is Bl~ B2> 0.
In communication technology such as B-ISDN, when terminal equipment intends to execute a transmission oE data, at Eirst it transmits a SETUP message to a network. At the same time it declares a necessary band Eor i-tselE for the network. After a certain band is secured in the network, the communication line is connected. The terminal equipment transmits data in a unit which is called a packet (cell).
~, A band is expressed by the number of cells able to be transmitted per seconcl. When a band value is, Eor example, 100, it rneans that one hundred cells can be transmitted per second.
[n the present invention, a telecommunication system comprises a number of units of terminal equipment which are connected to a communication network.
Each unit of terminal equipment has a call means. The call means transmits a S~TUP message to the network. The SETUP
message is for storing an initial band value Bl to be used by the terminal equipment. -The SETUP message is received ln the network, ~or example, by a switching system installed in the network. A band comparing means compares the initial band value Bl of the terminal equipment and a band value B2 of available band area of -the network.
The results of comparison are the three cases as ~ollows:
Blc B2 : transmission possible: band is vacant B2 = 0 : transmisslon irnpossible: no usable band Bl >B2 ~0 ~ transmission impossible: lack of usable band In the case of Bl ~ B2, a response means transmits a call control message indicating a call setting to the terminal equipment. When the call is set, a communication line is connected. Then communlcatlon ls possible.
In the case of B2 = 0, the response means transmits a call control message to the terminal equipment indica-ting that no usable band is available. A communication control means cuts off . ~ :
.
.
the call, when the terminal equ:ipment receives ~he call control message indica~ing no usable band.
In the case o~ Bl~ B2> 0, the response means transmits a call control message indicating lack of usable band to the terminal equipment. When the terminal equipment receives the call control message indicating lack of usable band, the communication control means calculates a revised band value B3 which is less than the band value B2. The revised band value B3 is stored in a SETUP message and -transmitted to the network by the call means.
The revised band value B3 may be obtained preferably by subtracting a specified value from the initial band value Bl.
Another way to obtain the revised band value B3 is as ~;
Eollows.
An insufficient band value calculating means may obtain an insufEicient band value B4 by subtracting the band value B2 from the ini-tial band value B1. The communication control means ;~
obtains the revised band value B3 by subtracting a value equal to or greater than the insuEficient band value B4 from the initial band value Bl.
~ The response means may transmit the band value B2 of the network to the terminal equipment in -the case of B1> B2> 0. Then the communication control means obtains the revised band value B3 by subtracting a specif.ied value from the band value B2.
According to the present invention as described in the above, even when a call from the terminal equipment is rejected, according to the condition of the ne-twork, the probability of setting a call can be improved by recalling with a reduced band ' ~
': :,~ .:
value. Therefo~e, in a ~-ISDN line, etc., a call process, a band setting process in particu]ar, ~rorn the termlnal equipment to the network can be eEfectively performed.
When ~he revised band value B3 is obtained by ' subtracting a specified value from the ini-tial band value Bl, the e~tent to which the band value can be reduced depends on the circumstances of respective UllitS o-E terminal equipment or the kinds of data to be transmitted (image data, audio data or character data). In the case of audio data or character data, for example, most oEten there is no problem Eor grasping the meaning of inEormation even though a band value is reduced, but ln the '~ ;
case of image data, there is a probability that the effectiveness of the image information may be lost by degradation of the image quality when the band value is reduced.
As mentioned in the above, when a band value cannot be reduced, a solution for such a case may be to provide a -timer and retransmit a SETUP message with the initial band value at -time-out of the timer~
The band value needed by the terminal equipment, that is the initial band value B1, is generally predetermined Eor each type oE terminal equipment. Band value depends on the kinds of data or amount of data to be transmitted. For example, i~ the terminal equipment is a telephone, the band value can be 20 since the amount of data is small. However, if the terminal equipment is a facsimile, the band value should be 100 since the amount of data is rather large.
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253~7-302 On the other h~nd, a band value setting means m~y be installed in the term.inal equipment. Its Eunction is to set the band val.ue Eor use according to the data to be transmi.tted.
BRIEF DESCRIPTION OF THE DRAWINGS
Figllre 1 is a chart explaining the principle of the present invention;
Figure 2 is a block diagram showing the system constitution of -the presen-t lnvention;
Figure 3 is a block diagram showing the system constitution of embodiment 1 Figure 4 is an illustrative representation showing the data constitution of a SETUP message to be transmitted in ~he present invention;
Figure 5 is an il].ustrative representation showing the data constitution of a call control message to be transmltted in the present i.nvention;
Figure 6 is a flow chart showing the process procedure in the terminal equipment in embodiment l;
Figure 7 is a flow chart showing the process procedure in the network in embodiment 1;
Figure 8 is a sequence chart showing the process in ambodiment l;
Flgure 9 is a sequence chart show.ing the process in the case of Bl ~B2 in embodiment 1;
Figure 10 is a sequence chart showing the process in the case of B2 = 0 in embodiment 1;
~ .
Figure lL i.s a sequence chart showin~ the process in the case of B].~ B2 ~0 ln embodiment 1;
Figure 12 is an illustrative representation showing a reason indication parameter added to a call control message from the network in the present invention;
Figure 13 is a flow chart showing the process procedure ln the terminal equipmen-t in embodiment 2;
Figure 14 is a sequence chart showing the process in ~ ~ :
embodiment 2;
Figure 15 is a :Elow chart showing the process procedure in the terminal e~uipment combining embodiment 1 and 2;
Figure 16 is a sequence chart showing the process transmitting a call control message with a reason indication parameter in the case of time-out;
Figure 17 is a flow chart showing the process procedure in the terminal equipment in embodiment 3;
Figure 18 is a block diagram showing the system wi-th an insufficient band value calculating means;
Figure 19 ls a block diagram showing the system with a hand value setting means.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
The invention will be fully understood from the following detailed description when read with reference to Figures l to 19.
Embodiment ].
Figure l is a principle illustrative representation of the present invention and Figure 2 is a block diagram showing the ' ~,, ' ' : ~
.: ~ ' . , , , , :
,- '.~
constitution o~ the present invention. Figure 3 shows an Arr~
swltching syste~ that ;s materiali~ed under these prlnclple ~ strative representatiorls. In Figure 3, reference numeral 2 indlcates a te~minal equipment, T~ indicates a terminal adapter, NT indicates a Networ~ Termination which forms the user network interface, 21 indicates a multiplexer, 22 indicates an input transmitting line, 23 indicates a communication line portion, 24 ~ -indicates an output transmitting line, 25 indicates a distributing circuit, 26 indicates a signal treatment por-tion, 27 indicates a traffic control portion, 28 indicates a call processing portion, 29 indicates a C-sUS for controlling signal, and 30 indlcates a SP-BUS for controlling a communication line~
Under this configuration, the amount oE traffic is input to the traEEic control portion 27, from the input transmitting line 22, the output transmitting line 24, and link of the communication line portion 23, and band value B2 in use is kept r Reference numerals 21 to 30 show one side of the network 1, and this network 1 is connected to terminal equipment 2 through a communication line 5. A call means 10 and a communication ~0 control section 3 are provided in the terminal equipment 2. The communication control section 3 executes the control of the transmission or reception oE message or data to or from the communlcation line 5.
Under this communication system, when a call is made from the call means 10 of the terminal equipment 2, the expected band used by the terminal, e.g. lOKbps or lOMbps, and the service class corresponding to the band, e.g. the determined mark such as .~,~ .
. . , .~
~ ; . . ~: . - , a, b, c, etc., are added to the SETUP message and transmitted to the network 1.
Figure 4 shows the Eormat of a SETUP message to be transmltted from the terminal equipment 2. In the present embodiment, the protocol conforms to layer 3 of OSI, and the SETUP
message shown in Figure 4 also conforms to it.
The message Eormat in the present embodiment is composed of a common section 6 and seven individual sections 7's (7a to 7g) having the constitutlon of 32 bits. The common section 6 is a place for directly registering messages, etc., and information elements are registered in the individual sectlons 7's.
The information elements are, for example, ~1) the attributes of a communication channel such as an exchange mode, an information transfer ability and an information transfer speed, (2) what channel (bl, B2 or D) is to be used for a call, (3) the number of an object subscriber and (4) the kind of services such as telephone communication, facsimile transmission, etc. These are registered in each individual section 7a to 7g respectively.
The length of band contents, traffic information, average value of the band and peak value of the band are registered in the third individual section 7c.
A SETUP message itself is expressed by a binary coded messa~e type, and the SETUP message (00000101, Eor example) is registered in the common section 6.
A call control message returned from the ne-twork 1 for the SETUP message transmitted from the terminal equipment 2 has also a similar constitution as shown in Figure 5, and the , .. . . ~ .. . . . . .
condltlon o~ the network 1 can be recogni2ed by analyzing the message type registered in the common section 6.
Next, the cont:rol method ln the communlcation control section of the terminal equipment 2 in the present embodiment will be explained using Figure 5 to Figure 11.
When a call is made from the terminal equipment 2, the communication control section 3 produces a SETUP message ¦SETUP) as shown in Figure 4. At this time, a message type, 00000101, of a SETUP message (SETUP) is :registered in the common section 6, and a band value, s = 100 for example as a peak value, is registered in the third individual section 7c as an information element (step ~ :
301) for transrnitti.ng the SETIJP message (SET~P) to -the network ~.
1 (302).
Once this SETUP message is detected by the switching system, it is input to the signal treatment portion 26 by way of the communication line portion 23. Then, the SETUP message inputted to the signal treatment portion 26 is input to the traffic control portion 27 and call processing portion 28. The early band Bl is transmitted to the band comparing means 40 in the traffic control portion 27.
In the call processing portion 28, when it receives the SETUP message, it discriminates between the input transmltti.ng line 22 and the output transmitting line 24, based on the sending terminal information, and call and receiver's address information, and inquires to the traffic control portion 27 whether the transmitting lines are occupied or not through the sending information.
'' ~
[n the trafEic control portion 27, the condition of use for the input transmitting lina 22 and the output transmitting line 24, e.g. band inEormation, is avallable Erom the tra~fic keeper and ls kept on the table 42. For the inquiry from the call processing portlon 2~, the band comparing means 40 of ~he traffic control portion 27 compares the band B2 in the network to the band Bl reported by the terminal, and judges whether it is ;possible or not to transmit to the reported band Bl.
The results of comparison are the three cases as ~0 follows~
Bl <2 "11" (transmission possible: band is vacant) B2 = 0 "00" (transmission impossible: no usable band) Bl ~B2 ~ 0 "10" (transmission impossible: lack of usable band) Once the call processing portion 28 receives "11" from the traffic control portion 27, it inquires about the condition of the call ]ink which connects with the input transmitting line 22 and output transmitting llne 24 at the traffic control portion 27.
Traffic control portion 27 selects -the link which enables the reported band Bl to be sent, judges whether or not there is a rout to connect among some switchesr e.g. the first link and the second link, and sends information which shows the possibility of transmission to the call processing portion 28~
Once the call processing portion 28 receives this information, it selects a path, and supplies connect control information to Eorm the path to the communication line portion 23.
Under this procedure, the line is connected. Accordingly, the terminal equipment 2 and object terminal equipment is connected.
, Next, a call control message from the network 1 (object ~:
terminal equipment.) :Eor the SETUP message (SETUP) i5 received (303). IF the ca11 control message from the network is CA~L PROC
(CALL PROCeeding) as shown in Figure 9, that is, an acceptance ~; .
notice for a call setting, the process is transEerred to a call setting acceptance process in step 307 through step 303, 304 and 306. ~ ~
The call setting acceptance process will be explained . -.
briefly in the following~ -Once a CALL PROC message from the ne~work 1 (the object terminal equipment) is received, then an ALERT (ALERTing) message, which shows that the object terminal equipment is transmitting a message to call a receiver, is transmitted to the terminal equipment 2. ~hen the receiver makes a response, CONN ( CONNect) is notified; thus the channel, B, is connected to both the transmitter and the receiver, and the telephone conversation or .
telephone communlcation is started.
When the call processing portion 28 receives "00" or : "10" as a result oE comparison from traffic control portion 27, as ~20 shown in Figures 10 and 11, the call processing porti.on 28 makes a call control message "REL COM" (RELease COMplete) and transmits ~he message to the terminal equipment 2. A reason indication parameter is registered in the information element of the message "REL COM". In the case that the result oE comparison is "00", the ~:
reason indication parameter is "#10". In the case that the result :
:
of comparison is "10", the reason indication parameter is "#11".
' .
~ , ~ . .. . .. . .
When the termirlal equipment 2 receives a call control message ~RErJ COM" fro~n the nctwork 1 for the SETUP message (SETUP), the process in stcp 304 and so on, as shown in Figure 6, is performed.
In other words, it is judged in the above-mentioned process iE the REh COM is caused by either impossibiliky oE
securing a band (304) or insufficiency of a band in the network 1 (306)~
The judgment can be made from a reason indication parameter registered in the information element of the message, REL CO~ from khe network 1. Number "#10" shows a case when a setting of a band area is impossible, and number "~11" shows a case when a band area is insufficient, for example. These relations are shown in Figure ]2.
When the communication is forbidden with the reception of REL COM, iE it is caused by the impossibility of band setting, the call is cut off (305). The process sequence corresponding to khis is shown in Figure 10. When the call is cut off, the initial SETUP message (SETUP) can be retransmitted again af-ter a specific waiting kime has passed. This waiting kime can be set freely.
IE the above-mentioned communica-tion Eorbidding is cased by the insufficiency of a band (306), a revised band value (B3 =
90) obtained by subtracting a certain value (assumed to be 10) from the initial band value (Bl = 100) is re-regiskered and a SETUP message (SETUP) iS retransmitted ko the network 1 (302).
.~ '' ' ; ' : ' . '~ ~ .
A process sequence in which communication is made posslble by reduclng a band value ;s shown in Figure 11.
E mbod i me n t 2 Figure 13 shows a process procedure ln ano~her embodiment according to the present invention.
According to the present embodiment, after a SETV~
message (SETUP) is transmitted in setting a band value (Bl - 100) (601), a timer 4 is started (602), and when a call control message from the network 1 is REL COM, the reason is analyzed (603). In the next step, the timer 4 is stopped (604).
The timer 4 i5 a subtraction counter to which an initia]
value is loaded from a RAM, a ROM, etc., not shown in the drawings, at a reception of a start command, and the value is subtracted with the lapse of time, and when the value reaches 0, it outputs a time out signal.
In cases oE time-out, the transmission of a SETUP
message is executed again (602).
The process sequence is shown in Figure 14.
As mentioned in the above, in the present embodlment, the transmisslon of a call can be repeated at every lapse of time of a Eixed period.
Figure 15 shows a process combining this embodiment 2 and above embodiment l. In the case oE "time-out", the reason indication parameter added to the call control message is "#12" as shown in Figures 12 and 16. ~-~ .
Embodiment 3 Figure 17 shows a process procedure in a :Eurther embodiment according to the p:resent invention.
According to the present embodirnent, at first a band value is set (Bl -- 100), then a SETUP message (SETUP) is transmitted (801 and 802), and after a timer 4 is s-tarted and a call control message is received (803), it is judged if the securlng oE a band is impossi.ble or a band i5 insu~flclent wl-th a reason indication parameter (804 and 808). In the case when band lQ securing is imposslble, similar to the second embodiment, at the time of time-out, a SETUP message is retransmitted and the timer 4 is s-tarted (802).
On the other hand, in step 808, if the reason is an insufficient band, similar to the :Eirst embodiment~ a revised SET~P message is produced in reducing the band value by a certain value, and the revised SETUP message is transmitted (810 and 802).
As descr.ibed in the above, according to the present embodiment, in the case when a band is impossible to secure or insu~ficient, a process Eor dealing with each case can be executed.
~nother Embodiment The embodiment 1 shows that the revised band value B3 is obtained by subtracting a speclEied value from the initial band value Bl in the case of insu:Eficient band value.
On the other hand, as shown in Figure 18, an insufficient band value calculating means 50 can be installed in the switching system. The insufficient band value calculating , , ~:
.
.
~ 5307-302 means obtains an insuE~icient band va]ue s4 by subtracting the band value B2 from the initial band value Bl. The insu-~icient band value B4 is stored in a call control message and transmitted to the terminal equipment. The terminal equipment 2 obtains a revised band value B3 by subtracting the insufflcient band value B4 from the initial band value Bl.
The insufficient band value calculating means 50 can b~
installed in the tra~fic control portion 27 oE the switching system.
In the case of Bl >B2 ~ 0, if the band value Bl became B2 ~Bl, transmission will be possible. Therefore, the following process permits the transmission.
The information of network band value B2 is registered in the information element oE the call control message with the reason indication parameter "~ll". The call control message including this information is transmltted to the terminal e~uipment 2 by the response means of the switching system. The -terminal equipment obtains new band value B3 based on the information of the network band value B2, for example by subtracting a certain value from the network band value B2.
The initial band value Bl can be variable according to the kinds oE data or amount of data. For example, if ~he terminal equipment is a TV telephone, the initlal band value B] is changed corresponding to the state whether the TV will be used or not, since the amount oE the data is small when the TV will not be usecl. The initial band value Bl is set by a band value setting means 54. As shown in Figure 19, the band value setting means 54 A
., - . .... .. . .... . .
-, .. . . ... . .
~5307-302 is installed in the terminal equipment 2. As the band value ~ .
setting means 54, there ls a means for detecting the kinds or amount of data automatical.ly and determining the value. A band value electing swi-tch or a band value input means manually operated can also be used as the band value set~ing means 54.
lg ~, ~
The present invention relates to an efEective technology applied to a communication system in which a communication band necessary for a unit o~ terminal equipment can be secured by transmitting a call control message (SETUP message) to a network from the terminal equipment as in the case of a call procedure in B-ISDN, etc.
In the B-ISDN network, various types of terminal equipment are connected with one communication line through the Network Termination (NT). As for the types of terminal equipment, there are telephones, facsimiles, computer data terminals, video terminals, telex, etc., and it is possible to use a number oE
these terminals a-t -the same time.
In this B-ISDN Network, when the service ls requested from the terminal, the communication starts aEter a network secures the communication band. For example, it is mentioned from ~
column 3 line 47 to column 4 line 27 in USP 4,704,716 that a .
signal, i.e. SETUP message, for requesting the width of -the band ;
is sent from a terminal, and then the network secures the adequate width of the band, and connects the communication line.
The width of the band required to communlcate depends on the type oE terminal. A terminal which contains much data requires a wide band and, on the other hand, in the case oE a terminal containing little data, a narrow band is suEficient.
When a SETUP message is transmitted to the network from a unit oE terminal equipment, if securing a band setting in the network according to the informa-tion element of the message is ~
~, .
.~
~ .
-:
:
, :: : ... , - :
.
found to be impossible, the call procedure has to he repeated.
secause o~ thisl much time is spent for the call process itsel~, thereEore, resulting in lower communication efE.ic:i0ncy which is of concern.
SUMMARY OF THE INVENTION
The above-ment,ioned problems are solved by ~he present invention. An object of the invention is to offer a technology which executes eEfectively a call process, a band setting process in particularr to a network from a unit oE terminal equipmen-t~
Therefore, in accordance with one aspect of the invention, there is provided a band managing method in a communication system having terminal equipment connected to a communication network comprising the steps of: (a) transmitting a first message storing an initial band value to be used by the terminal equipment from the terminal equipment to the network;
(b) comparing the initial band value Bl oE the terminal equipment and a band value B2 of available band area of the network; (c) transmitting a call control message indicating a call setting to . ' the terminal equipment when the result of the comparison is Bl C B2; (d) transmitting a call control message indicating no =
usable band to the termi.nal equipment when the result o:E the comparison ls B2 = 0; (e) transmitti.ng a call control message indica-ting lack of usable band to the terminal equipment when the result of the comparison is Bl >B2 >0; (f) cutting off the call when the terminal equipment has received the call control message indicati.ng no band to use; and (g) calculating a revised band value B3 which is less than the band value B2, storing the revised .~' .
.'~1 band value B3 in the Elrs~ message and retransmitting the :Eirst message to the network.
According to another aspect oE the invention, there is provided a band managing syste~ in a communication system having terminal equipment connected to a communication network comprising: (a) call means for storing an initial band value Bl to be used by the terminal equipment ln a :Eirst message and transmitting the first message -to the network; (b) band comparing means for comparing the initial band value Bl of -the terminal equipment and a band value B2 of available band area o:E the network; tc) response means ~or transmitting a call control message indicating call se-tting to the terminal equipment when the result o~ the comparison is Bl ~B2, transmit-ting a call control message indicating no band to use to the terminal equipment when the result of the comparison is B2 = 0 and transmitting a call control message indica-ting insufficient band value to use to the terminal equipment when the result of the comparison is Bl~ B2 ~0;
and (d) communication control means for cutting oE~ the call when the terminal equipment receives the call control message indicat-ting no usable band, calculating a revised band value B3 which isless than the band value B2, storing the revised band value B3 in the :Eirst message and transmitting the :Eirst message to the network. ~.
According to a ~urther aspect oE the invention, there is provided a terminal equipment being connected to a communication network comprising: (a) call means ~or storing an initial band value to be used by the terminal equipment in a SETUP message - :, . . : .. .
and transmitting the SETUP message to the network; and (b) communication control means for controlling a call procedure of the call means, cutting o~f the call procedure in the case of receiving a call control message indicating no usable band, calculating a revised band value B3 which is less than the band value B2, storing the revised band value B3 in the SETUP message and transmittiny the SETUP message to the network.
According to a still ~urther aspect of the invention, there is provided a swi-tching system in a communication system having termina] equipment connec-ted to a communication network comprising: (a) band comparing means for comparing the initial band value Bl of the terminal equipment and a band value B2 o-E
available band area o~ the network; and (b~ response means for transmitting a call control message Eor a call setting to the terminal equipment when the result of the comparison is Bl <B2, transmitting a call contro] message indicating no band to use to the terminal equipment when the result of the comparison is B2 = 0 and transmitting a call control message indlcating insufficient band value to use to the terminal equipment when the result of the comparison is Bl~ B2> 0.
In communication technology such as B-ISDN, when terminal equipment intends to execute a transmission oE data, at Eirst it transmits a SETUP message to a network. At the same time it declares a necessary band Eor i-tselE for the network. After a certain band is secured in the network, the communication line is connected. The terminal equipment transmits data in a unit which is called a packet (cell).
~, A band is expressed by the number of cells able to be transmitted per seconcl. When a band value is, Eor example, 100, it rneans that one hundred cells can be transmitted per second.
[n the present invention, a telecommunication system comprises a number of units of terminal equipment which are connected to a communication network.
Each unit of terminal equipment has a call means. The call means transmits a S~TUP message to the network. The SETUP
message is for storing an initial band value Bl to be used by the terminal equipment. -The SETUP message is received ln the network, ~or example, by a switching system installed in the network. A band comparing means compares the initial band value Bl of the terminal equipment and a band value B2 of available band area of -the network.
The results of comparison are the three cases as ~ollows:
Blc B2 : transmission possible: band is vacant B2 = 0 : transmisslon irnpossible: no usable band Bl >B2 ~0 ~ transmission impossible: lack of usable band In the case of Bl ~ B2, a response means transmits a call control message indicating a call setting to the terminal equipment. When the call is set, a communication line is connected. Then communlcatlon ls possible.
In the case of B2 = 0, the response means transmits a call control message to the terminal equipment indica-ting that no usable band is available. A communication control means cuts off . ~ :
.
.
the call, when the terminal equ:ipment receives ~he call control message indica~ing no usable band.
In the case o~ Bl~ B2> 0, the response means transmits a call control message indicating lack of usable band to the terminal equipment. When the terminal equipment receives the call control message indicating lack of usable band, the communication control means calculates a revised band value B3 which is less than the band value B2. The revised band value B3 is stored in a SETUP message and -transmitted to the network by the call means.
The revised band value B3 may be obtained preferably by subtracting a specified value from the initial band value Bl.
Another way to obtain the revised band value B3 is as ~;
Eollows.
An insufficient band value calculating means may obtain an insufEicient band value B4 by subtracting the band value B2 from the ini-tial band value B1. The communication control means ;~
obtains the revised band value B3 by subtracting a value equal to or greater than the insuEficient band value B4 from the initial band value Bl.
~ The response means may transmit the band value B2 of the network to the terminal equipment in -the case of B1> B2> 0. Then the communication control means obtains the revised band value B3 by subtracting a specif.ied value from the band value B2.
According to the present invention as described in the above, even when a call from the terminal equipment is rejected, according to the condition of the ne-twork, the probability of setting a call can be improved by recalling with a reduced band ' ~
': :,~ .:
value. Therefo~e, in a ~-ISDN line, etc., a call process, a band setting process in particu]ar, ~rorn the termlnal equipment to the network can be eEfectively performed.
When ~he revised band value B3 is obtained by ' subtracting a specified value from the ini-tial band value Bl, the e~tent to which the band value can be reduced depends on the circumstances of respective UllitS o-E terminal equipment or the kinds of data to be transmitted (image data, audio data or character data). In the case of audio data or character data, for example, most oEten there is no problem Eor grasping the meaning of inEormation even though a band value is reduced, but ln the '~ ;
case of image data, there is a probability that the effectiveness of the image information may be lost by degradation of the image quality when the band value is reduced.
As mentioned in the above, when a band value cannot be reduced, a solution for such a case may be to provide a -timer and retransmit a SETUP message with the initial band value at -time-out of the timer~
The band value needed by the terminal equipment, that is the initial band value B1, is generally predetermined Eor each type oE terminal equipment. Band value depends on the kinds of data or amount of data to be transmitted. For example, i~ the terminal equipment is a telephone, the band value can be 20 since the amount of data is small. However, if the terminal equipment is a facsimile, the band value should be 100 since the amount of data is rather large.
..~
- : . - -- ........... . ..
~,.: ~ .. : - - :
' ' ; .
.. . ~
,., - :.
253~7-302 On the other h~nd, a band value setting means m~y be installed in the term.inal equipment. Its Eunction is to set the band val.ue Eor use according to the data to be transmi.tted.
BRIEF DESCRIPTION OF THE DRAWINGS
Figllre 1 is a chart explaining the principle of the present invention;
Figure 2 is a block diagram showing the system constitution of -the presen-t lnvention;
Figure 3 is a block diagram showing the system constitution of embodiment 1 Figure 4 is an illustrative representation showing the data constitution of a SETUP message to be transmitted in ~he present invention;
Figure 5 is an il].ustrative representation showing the data constitution of a call control message to be transmltted in the present i.nvention;
Figure 6 is a flow chart showing the process procedure in the terminal equipment in embodiment l;
Figure 7 is a flow chart showing the process procedure in the network in embodiment 1;
Figure 8 is a sequence chart showing the process in ambodiment l;
Flgure 9 is a sequence chart show.ing the process in the case of Bl ~B2 in embodiment 1;
Figure 10 is a sequence chart showing the process in the case of B2 = 0 in embodiment 1;
~ .
Figure lL i.s a sequence chart showin~ the process in the case of B].~ B2 ~0 ln embodiment 1;
Figure 12 is an illustrative representation showing a reason indication parameter added to a call control message from the network in the present invention;
Figure 13 is a flow chart showing the process procedure ln the terminal equipmen-t in embodiment 2;
Figure 14 is a sequence chart showing the process in ~ ~ :
embodiment 2;
Figure 15 is a :Elow chart showing the process procedure in the terminal e~uipment combining embodiment 1 and 2;
Figure 16 is a sequence chart showing the process transmitting a call control message with a reason indication parameter in the case of time-out;
Figure 17 is a flow chart showing the process procedure in the terminal equipment in embodiment 3;
Figure 18 is a block diagram showing the system wi-th an insufficient band value calculating means;
Figure 19 ls a block diagram showing the system with a hand value setting means.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION
The invention will be fully understood from the following detailed description when read with reference to Figures l to 19.
Embodiment ].
Figure l is a principle illustrative representation of the present invention and Figure 2 is a block diagram showing the ' ~,, ' ' : ~
.: ~ ' . , , , , :
,- '.~
constitution o~ the present invention. Figure 3 shows an Arr~
swltching syste~ that ;s materiali~ed under these prlnclple ~ strative representatiorls. In Figure 3, reference numeral 2 indlcates a te~minal equipment, T~ indicates a terminal adapter, NT indicates a Networ~ Termination which forms the user network interface, 21 indicates a multiplexer, 22 indicates an input transmitting line, 23 indicates a communication line portion, 24 ~ -indicates an output transmitting line, 25 indicates a distributing circuit, 26 indicates a signal treatment por-tion, 27 indicates a traffic control portion, 28 indicates a call processing portion, 29 indicates a C-sUS for controlling signal, and 30 indlcates a SP-BUS for controlling a communication line~
Under this configuration, the amount oE traffic is input to the traEEic control portion 27, from the input transmitting line 22, the output transmitting line 24, and link of the communication line portion 23, and band value B2 in use is kept r Reference numerals 21 to 30 show one side of the network 1, and this network 1 is connected to terminal equipment 2 through a communication line 5. A call means 10 and a communication ~0 control section 3 are provided in the terminal equipment 2. The communication control section 3 executes the control of the transmission or reception oE message or data to or from the communlcation line 5.
Under this communication system, when a call is made from the call means 10 of the terminal equipment 2, the expected band used by the terminal, e.g. lOKbps or lOMbps, and the service class corresponding to the band, e.g. the determined mark such as .~,~ .
. . , .~
~ ; . . ~: . - , a, b, c, etc., are added to the SETUP message and transmitted to the network 1.
Figure 4 shows the Eormat of a SETUP message to be transmltted from the terminal equipment 2. In the present embodiment, the protocol conforms to layer 3 of OSI, and the SETUP
message shown in Figure 4 also conforms to it.
The message Eormat in the present embodiment is composed of a common section 6 and seven individual sections 7's (7a to 7g) having the constitutlon of 32 bits. The common section 6 is a place for directly registering messages, etc., and information elements are registered in the individual sectlons 7's.
The information elements are, for example, ~1) the attributes of a communication channel such as an exchange mode, an information transfer ability and an information transfer speed, (2) what channel (bl, B2 or D) is to be used for a call, (3) the number of an object subscriber and (4) the kind of services such as telephone communication, facsimile transmission, etc. These are registered in each individual section 7a to 7g respectively.
The length of band contents, traffic information, average value of the band and peak value of the band are registered in the third individual section 7c.
A SETUP message itself is expressed by a binary coded messa~e type, and the SETUP message (00000101, Eor example) is registered in the common section 6.
A call control message returned from the ne-twork 1 for the SETUP message transmitted from the terminal equipment 2 has also a similar constitution as shown in Figure 5, and the , .. . . ~ .. . . . . .
condltlon o~ the network 1 can be recogni2ed by analyzing the message type registered in the common section 6.
Next, the cont:rol method ln the communlcation control section of the terminal equipment 2 in the present embodiment will be explained using Figure 5 to Figure 11.
When a call is made from the terminal equipment 2, the communication control section 3 produces a SETUP message ¦SETUP) as shown in Figure 4. At this time, a message type, 00000101, of a SETUP message (SETUP) is :registered in the common section 6, and a band value, s = 100 for example as a peak value, is registered in the third individual section 7c as an information element (step ~ :
301) for transrnitti.ng the SETIJP message (SET~P) to -the network ~.
1 (302).
Once this SETUP message is detected by the switching system, it is input to the signal treatment portion 26 by way of the communication line portion 23. Then, the SETUP message inputted to the signal treatment portion 26 is input to the traffic control portion 27 and call processing portion 28. The early band Bl is transmitted to the band comparing means 40 in the traffic control portion 27.
In the call processing portion 28, when it receives the SETUP message, it discriminates between the input transmltti.ng line 22 and the output transmitting line 24, based on the sending terminal information, and call and receiver's address information, and inquires to the traffic control portion 27 whether the transmitting lines are occupied or not through the sending information.
'' ~
[n the trafEic control portion 27, the condition of use for the input transmitting lina 22 and the output transmitting line 24, e.g. band inEormation, is avallable Erom the tra~fic keeper and ls kept on the table 42. For the inquiry from the call processing portlon 2~, the band comparing means 40 of ~he traffic control portion 27 compares the band B2 in the network to the band Bl reported by the terminal, and judges whether it is ;possible or not to transmit to the reported band Bl.
The results of comparison are the three cases as ~0 follows~
Bl <2 "11" (transmission possible: band is vacant) B2 = 0 "00" (transmission impossible: no usable band) Bl ~B2 ~ 0 "10" (transmission impossible: lack of usable band) Once the call processing portion 28 receives "11" from the traffic control portion 27, it inquires about the condition of the call ]ink which connects with the input transmitting line 22 and output transmitting llne 24 at the traffic control portion 27.
Traffic control portion 27 selects -the link which enables the reported band Bl to be sent, judges whether or not there is a rout to connect among some switchesr e.g. the first link and the second link, and sends information which shows the possibility of transmission to the call processing portion 28~
Once the call processing portion 28 receives this information, it selects a path, and supplies connect control information to Eorm the path to the communication line portion 23.
Under this procedure, the line is connected. Accordingly, the terminal equipment 2 and object terminal equipment is connected.
, Next, a call control message from the network 1 (object ~:
terminal equipment.) :Eor the SETUP message (SETUP) i5 received (303). IF the ca11 control message from the network is CA~L PROC
(CALL PROCeeding) as shown in Figure 9, that is, an acceptance ~; .
notice for a call setting, the process is transEerred to a call setting acceptance process in step 307 through step 303, 304 and 306. ~ ~
The call setting acceptance process will be explained . -.
briefly in the following~ -Once a CALL PROC message from the ne~work 1 (the object terminal equipment) is received, then an ALERT (ALERTing) message, which shows that the object terminal equipment is transmitting a message to call a receiver, is transmitted to the terminal equipment 2. ~hen the receiver makes a response, CONN ( CONNect) is notified; thus the channel, B, is connected to both the transmitter and the receiver, and the telephone conversation or .
telephone communlcation is started.
When the call processing portion 28 receives "00" or : "10" as a result oE comparison from traffic control portion 27, as ~20 shown in Figures 10 and 11, the call processing porti.on 28 makes a call control message "REL COM" (RELease COMplete) and transmits ~he message to the terminal equipment 2. A reason indication parameter is registered in the information element of the message "REL COM". In the case that the result oE comparison is "00", the ~:
reason indication parameter is "#10". In the case that the result :
:
of comparison is "10", the reason indication parameter is "#11".
' .
~ , ~ . .. . .. . .
When the termirlal equipment 2 receives a call control message ~RErJ COM" fro~n the nctwork 1 for the SETUP message (SETUP), the process in stcp 304 and so on, as shown in Figure 6, is performed.
In other words, it is judged in the above-mentioned process iE the REh COM is caused by either impossibiliky oE
securing a band (304) or insufficiency of a band in the network 1 (306)~
The judgment can be made from a reason indication parameter registered in the information element of the message, REL CO~ from khe network 1. Number "#10" shows a case when a setting of a band area is impossible, and number "~11" shows a case when a band area is insufficient, for example. These relations are shown in Figure ]2.
When the communication is forbidden with the reception of REL COM, iE it is caused by the impossibility of band setting, the call is cut off (305). The process sequence corresponding to khis is shown in Figure 10. When the call is cut off, the initial SETUP message (SETUP) can be retransmitted again af-ter a specific waiting kime has passed. This waiting kime can be set freely.
IE the above-mentioned communica-tion Eorbidding is cased by the insufficiency of a band (306), a revised band value (B3 =
90) obtained by subtracting a certain value (assumed to be 10) from the initial band value (Bl = 100) is re-regiskered and a SETUP message (SETUP) iS retransmitted ko the network 1 (302).
.~ '' ' ; ' : ' . '~ ~ .
A process sequence in which communication is made posslble by reduclng a band value ;s shown in Figure 11.
E mbod i me n t 2 Figure 13 shows a process procedure ln ano~her embodiment according to the present invention.
According to the present embodiment, after a SETV~
message (SETUP) is transmitted in setting a band value (Bl - 100) (601), a timer 4 is started (602), and when a call control message from the network 1 is REL COM, the reason is analyzed (603). In the next step, the timer 4 is stopped (604).
The timer 4 i5 a subtraction counter to which an initia]
value is loaded from a RAM, a ROM, etc., not shown in the drawings, at a reception of a start command, and the value is subtracted with the lapse of time, and when the value reaches 0, it outputs a time out signal.
In cases oE time-out, the transmission of a SETUP
message is executed again (602).
The process sequence is shown in Figure 14.
As mentioned in the above, in the present embodlment, the transmisslon of a call can be repeated at every lapse of time of a Eixed period.
Figure 15 shows a process combining this embodiment 2 and above embodiment l. In the case oE "time-out", the reason indication parameter added to the call control message is "#12" as shown in Figures 12 and 16. ~-~ .
Embodiment 3 Figure 17 shows a process procedure in a :Eurther embodiment according to the p:resent invention.
According to the present embodirnent, at first a band value is set (Bl -- 100), then a SETUP message (SETUP) is transmitted (801 and 802), and after a timer 4 is s-tarted and a call control message is received (803), it is judged if the securlng oE a band is impossi.ble or a band i5 insu~flclent wl-th a reason indication parameter (804 and 808). In the case when band lQ securing is imposslble, similar to the second embodiment, at the time of time-out, a SETUP message is retransmitted and the timer 4 is s-tarted (802).
On the other hand, in step 808, if the reason is an insufficient band, similar to the :Eirst embodiment~ a revised SET~P message is produced in reducing the band value by a certain value, and the revised SETUP message is transmitted (810 and 802).
As descr.ibed in the above, according to the present embodiment, in the case when a band is impossible to secure or insu~ficient, a process Eor dealing with each case can be executed.
~nother Embodiment The embodiment 1 shows that the revised band value B3 is obtained by subtracting a speclEied value from the initial band value Bl in the case of insu:Eficient band value.
On the other hand, as shown in Figure 18, an insufficient band value calculating means 50 can be installed in the switching system. The insufficient band value calculating , , ~:
.
.
~ 5307-302 means obtains an insuE~icient band va]ue s4 by subtracting the band value B2 from the initial band value Bl. The insu-~icient band value B4 is stored in a call control message and transmitted to the terminal equipment. The terminal equipment 2 obtains a revised band value B3 by subtracting the insufflcient band value B4 from the initial band value Bl.
The insufficient band value calculating means 50 can b~
installed in the tra~fic control portion 27 oE the switching system.
In the case of Bl >B2 ~ 0, if the band value Bl became B2 ~Bl, transmission will be possible. Therefore, the following process permits the transmission.
The information of network band value B2 is registered in the information element oE the call control message with the reason indication parameter "~ll". The call control message including this information is transmltted to the terminal e~uipment 2 by the response means of the switching system. The -terminal equipment obtains new band value B3 based on the information of the network band value B2, for example by subtracting a certain value from the network band value B2.
The initial band value Bl can be variable according to the kinds oE data or amount of data. For example, if ~he terminal equipment is a TV telephone, the initlal band value B] is changed corresponding to the state whether the TV will be used or not, since the amount oE the data is small when the TV will not be usecl. The initial band value Bl is set by a band value setting means 54. As shown in Figure 19, the band value setting means 54 A
., - . .... .. . .... . .
-, .. . . ... . .
~5307-302 is installed in the terminal equipment 2. As the band value ~ .
setting means 54, there ls a means for detecting the kinds or amount of data automatical.ly and determining the value. A band value electing swi-tch or a band value input means manually operated can also be used as the band value set~ing means 54.
lg ~, ~
Claims (18)
1. A band managing method in a communication system having terminal equipment connected to a communication network comprising the steps of:
(a) transmitting a first message storing an initial band value to be used by the terminal equipment from the terminal equipment to the network;
(b) comparing the initial band value B1 of the terminal equipment and a band value B2 of available band area of the network;
(c) transmitting a call control message indicating a call setting to the terminal equipment when the result of the comparison is B1 ~ B2;
(d) transmitting a call control message indicating no usable band to the terminal equipment when the result of the comparison is B2 = 0;
(e) transmitting a call control massage indicating lack of usable band to the terminal equipment when the result of the comparison is B1 >B2> 0;
(f) cutting off the call when the terminal equipment has received the call control message indicating no band to use; and (g) calculating a revised band value B3 which is less than the band value B2, storing the revised band value B3 in the first message and retransmitting the first message to the network.
(a) transmitting a first message storing an initial band value to be used by the terminal equipment from the terminal equipment to the network;
(b) comparing the initial band value B1 of the terminal equipment and a band value B2 of available band area of the network;
(c) transmitting a call control message indicating a call setting to the terminal equipment when the result of the comparison is B1 ~ B2;
(d) transmitting a call control message indicating no usable band to the terminal equipment when the result of the comparison is B2 = 0;
(e) transmitting a call control massage indicating lack of usable band to the terminal equipment when the result of the comparison is B1 >B2> 0;
(f) cutting off the call when the terminal equipment has received the call control message indicating no band to use; and (g) calculating a revised band value B3 which is less than the band value B2, storing the revised band value B3 in the first message and retransmitting the first message to the network.
2. A band managing method according to claim 1, wherein the revised band value B3 is obtained by subtracting a specified value from the initial band value B1.
3. A band managing method according to claim 1, wherein the revised band value B3 is obtained by the steps of:
(a) obtaining an insufficient band value B4 by subtracting the band value B2 from the initial band value B1;
(b) transmitting the insufficient band value B4 to the terminal equipment; and (c) subtracting the insufficient band value B4 and upward from the initial band value B1 in the terminal equipment.
(a) obtaining an insufficient band value B4 by subtracting the band value B2 from the initial band value B1;
(b) transmitting the insufficient band value B4 to the terminal equipment; and (c) subtracting the insufficient band value B4 and upward from the initial band value B1 in the terminal equipment.
4. A band managing method according to claim 1, wherein the revised band value B3 is obtained by the steps of:
(a) transmitting the band value B2 of the network to the terminal equipment in the case of B1> B2 >0; and (b) subtracting a specified value from the band value B2 in the terminal equipment.
(a) transmitting the band value B2 of the network to the terminal equipment in the case of B1> B2 >0; and (b) subtracting a specified value from the band value B2 in the terminal equipment.
5. A band managing method according to claim 1, wherein the communication system having a timer which starts at the time of transmitting the SETUP message storing the initial band value B1;
and further comprising a step for retransmitting the SETUP
message storing the initial band value B1 in judging the timer to be in a state of time out.
and further comprising a step for retransmitting the SETUP
message storing the initial band value B1 in judging the timer to be in a state of time out.
6. A band managing system in a communication system having terminal equipment connected to a communication network comprising:
(a) call means for storing an initial band value B1 to be used by the terminal equipment in a first message and transmitting the first message to the network;
(b) band comparing means for comparing the initial band value B1 of the terminal equipment and a band value B2 of available band area of the network;
(c) response means for transmitting a call control message indicating call setting to the terminal equipment when the result of the comparison is B1~B2, transmitting a call control message indicating no band to use to the terminal equipment when the result of the comparison is B2 = 0 and transmitting a call control message indicating insufficient band value to use to the terminal equipment when the result of the comparison is B1>B2>0; and (d) communication control means for cutting off the call when the terminal equipment receives the call control message indicating no usable band, calculating a revised band value B3 which is less than the band value B2, storing the revised band value B3 in the first message and transmitting the first message to the network.
(a) call means for storing an initial band value B1 to be used by the terminal equipment in a first message and transmitting the first message to the network;
(b) band comparing means for comparing the initial band value B1 of the terminal equipment and a band value B2 of available band area of the network;
(c) response means for transmitting a call control message indicating call setting to the terminal equipment when the result of the comparison is B1~B2, transmitting a call control message indicating no band to use to the terminal equipment when the result of the comparison is B2 = 0 and transmitting a call control message indicating insufficient band value to use to the terminal equipment when the result of the comparison is B1>B2>0; and (d) communication control means for cutting off the call when the terminal equipment receives the call control message indicating no usable band, calculating a revised band value B3 which is less than the band value B2, storing the revised band value B3 in the first message and transmitting the first message to the network.
7. A band managing system according to claim 6, wherein the communication control means obtains the revised band value B3 by subtracting a specified value from the initial band value B1.
8. A band managing system according to claim 6, further comprising an insufficient band value calculating means for obtaining an insufficient band value B4 by subtracting the band value B2 from the initial band value B1, and the communication control means obtains the revised band value B3 by subtracting a value equal to or greater than the insufficient band value B4 from the initial band value B1, storing the revised band value in the SETUP message and transmitting the SETUP message to the network.
9. A band managing system according to claim 6, wherein the response means transmits the band value B2 of the network to the terminal equipment in the case of B1 > B2 > 0; the communication control means obtains the revised band value B3 by subtracting a specified value from the band value B2 and transmits the revised band value B3 to the network.
10. A band managing system according to claim 6, further comprising a band value setting means for setting a band value to use corresponding to data to be transmitted, the band value set is stored in the first message as an initial band value B1.
11. A band managing system according to claim 6, further comprising a timer which starts at the time of transmitting the first message storing the initial band value B1, and the communication control means retransmits the first message storing the initial band value B1 in judging the timer to be in a state of time out.
12. A terminal equipment being connected to a communication network comprising:
(a) call means for storing an initial band value to be used by the terminal equipment in a SETUP message and transmitting the SETUP message to the network; and (b) communication control means for controlling a call procedure of the call means, cutting off the call procedure in the case of receiving a call control message indicating no usable band, calculating a revised band value B3 which is less than the band value B2, storing the revised band value B3 in the SETUP message and transmitting the SETUP message to the network.
(a) call means for storing an initial band value to be used by the terminal equipment in a SETUP message and transmitting the SETUP message to the network; and (b) communication control means for controlling a call procedure of the call means, cutting off the call procedure in the case of receiving a call control message indicating no usable band, calculating a revised band value B3 which is less than the band value B2, storing the revised band value B3 in the SETUP message and transmitting the SETUP message to the network.
13. A terminal equipment according to claim 12, wherein the communication control means obtains the revised band value B3 by subtracting a specified value from the initial band value B1.
14. A terminal equipment according to claim 12, further comprising a timer started by the communication control means at the time of transmitting the SETUP message storing the initial band value B1, and the communication control means retransmits the SETUP message storing the initial band value B1 in judging the timer to be in a state of time out.
15. A terminal equipment according to claim 12, further comprising a band value setting means for setting a band value to use corresponding to data to be transmitted.
16. A switching system in a communication system having terminal equipment connected to a communication network comprising:
(a) band comparing means for comparing the initial band value B1 of the terminal equipment and a band value B2 of available band area of the network; and (b) response means for transmitting a call control message for a call setting to the terminal equipment when the result of the comparison is B1~B2, transmitting a call control message indicating no band to use to the terminal equipment when the result of the comparison is B2 = 0 and transmitting a call control message indicating insufficient band value to use to the terminal equipment when the result of the comparison is B1 > B2 > 0.
(a) band comparing means for comparing the initial band value B1 of the terminal equipment and a band value B2 of available band area of the network; and (b) response means for transmitting a call control message for a call setting to the terminal equipment when the result of the comparison is B1~B2, transmitting a call control message indicating no band to use to the terminal equipment when the result of the comparison is B2 = 0 and transmitting a call control message indicating insufficient band value to use to the terminal equipment when the result of the comparison is B1 > B2 > 0.
17. A switching system according to claim 16, further comprising an insufficient band value calculating means for obtaining an insufficient band value B4 by subtracting the band value B2 from the initial band value B1, and the response means stores insufficient band value B4 in the call control message and transmits the call control message to the terminal equipment.
18. A switching system according to claim 16, wherein the response means transmits the band value B2 of the network to the terminal equipment in the case of B1 > B2 > 0.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3-165366 | 1991-07-05 | ||
| JP3165366A JPH0514546A (en) | 1991-07-05 | 1991-07-05 | Wave band management system in communication |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2073093A1 CA2073093A1 (en) | 1993-01-06 |
| CA2073093C true CA2073093C (en) | 1997-11-18 |
Family
ID=15811007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002073093A Expired - Fee Related CA2073093C (en) | 1991-07-05 | 1992-07-03 | Band management system in communication |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5572518A (en) |
| EP (1) | EP0524467B1 (en) |
| JP (1) | JPH0514546A (en) |
| CA (1) | CA2073093C (en) |
| DE (1) | DE69232080T2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5530695A (en) * | 1993-12-15 | 1996-06-25 | Nec Usa, Inc. | UPC-based traffic control framework for ATM networks |
| JPH08279814A (en) * | 1995-02-10 | 1996-10-22 | Fujitsu Ltd | Method for setting and controlling plural connections |
| JPH0974420A (en) * | 1995-09-06 | 1997-03-18 | Fujitsu Ltd | Band control system |
| GB2327317B (en) | 1997-07-11 | 2002-02-13 | Ericsson Telefon Ab L M | Access control and resourse reservation in a communications network |
| JP3070562B2 (en) * | 1997-12-24 | 2000-07-31 | 日本電気株式会社 | Cell delay fluctuation suppression band setting device |
| US6404735B1 (en) * | 1998-04-30 | 2002-06-11 | Nortel Networks Limited | Methods and apparatus for distributed control of a multi-class network |
| US6577613B1 (en) * | 1999-03-02 | 2003-06-10 | Verizon Corporate Services Group Inc. | Method and apparatus for asynchronous reservation-oriented multiple access for wireless networks |
| US7228421B1 (en) * | 2001-06-27 | 2007-06-05 | Cisco Technology, Inc. | Technique for generating control messages with reason information between nodes in a data network |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3276041D1 (en) * | 1982-12-28 | 1987-05-14 | Ibm | Method of dynamic assignment of speeds in a multiplex transmission system |
| US4704716A (en) * | 1985-12-31 | 1987-11-03 | American Telephone And Telegraph Company, At&T Bell Laboratories | Method and apparatus for establishing a wideband communication facility through a communication network having narrow bandwidth channels |
| BE905982A (en) * | 1986-12-19 | 1987-06-19 | Electronique Et Telecomm Bell | PACKET SWITCHING NETWORK. |
| US4884269A (en) * | 1988-06-20 | 1989-11-28 | Hayes Microcomputer Products, Inc. | Method and apparatus for connecting ISDN devices over an analog telephone line |
| US5054019A (en) * | 1989-01-13 | 1991-10-01 | International Business Machines Corporation | Transfer direction turnaround in network data communications |
| US5153877A (en) * | 1989-04-21 | 1992-10-06 | Kabushiki Kaisha Toshiba | Packet network with communication resource allocation and call set up control of higher quality of service |
| JP2837182B2 (en) * | 1989-08-04 | 1998-12-14 | 富士通株式会社 | Cell data transmission method, transmission request processing method, and switch |
| FR2655223B1 (en) * | 1989-11-27 | 1992-02-07 | Cit Alcatel | METHOD OF MANAGING FLOWS IN A BROADBAND BROADBAND DIGITAL TELECOMMUNICATION NETWORK, AND NETWORK FOR CARRYING OUT SAID METHOD. |
| CA2038646C (en) * | 1990-03-20 | 1995-02-07 | Katsumi Oomuro | Atm communication system with optimal traffic control by changing the allocated bandwidth |
| US5187707A (en) * | 1990-12-03 | 1993-02-16 | Northern Telecom Limited | Packet data flow control for an isdn D-channel |
-
1991
- 1991-07-05 JP JP3165366A patent/JPH0514546A/en active Pending
-
1992
- 1992-07-03 EP EP92111309A patent/EP0524467B1/en not_active Expired - Lifetime
- 1992-07-03 CA CA002073093A patent/CA2073093C/en not_active Expired - Fee Related
- 1992-07-03 DE DE69232080T patent/DE69232080T2/en not_active Expired - Fee Related
-
1995
- 1995-05-01 US US08/432,258 patent/US5572518A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE69232080D1 (en) | 2001-10-31 |
| EP0524467A3 (en) | 1995-01-04 |
| US5572518A (en) | 1996-11-05 |
| EP0524467A2 (en) | 1993-01-27 |
| CA2073093A1 (en) | 1993-01-06 |
| EP0524467B1 (en) | 2001-09-26 |
| DE69232080T2 (en) | 2002-06-13 |
| JPH0514546A (en) | 1993-01-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |