CN1520677A - Interaction of user's B-side user function in telecommunication network system - Google Patents

Abstract

The present invention relates to user service functions in telecommunication network systems such as ISDN. According to the present invention, certain combinations of business functions are allowed to interact appropriately in some special cases. Concretely consider the situation that the A user (2) calls (6) the B user (3) when the B user line (3) is busy (7). In ISDN terminology, these service functions are grouped as: (i) Call Waiting (CW) followed by Call Completion in Busy Subscriber (CCBS); (ii) Call Forwarding on No Answer (DIVDA) followed by CCBS; (iii) CW, followed by call forwarding on busy (DIVBY). In case (i) and case (ii), accept (15) the CCBS request (12) initiated by A-subscriber (2), in case (iii) transfer (31) the call initiated by A-subscriber (2) (6).

Description

Interaction of user's B-side user function in telecommunication network system

The present invention relates to telecommunication systems, and more particularly to user service functions. These service functions are commonly used, for example, in Integrated Services Digital Networks (ISDN).

The following description relates to the use of the invention in an ISDN telecommunication system. However, the present invention relates to any telecommunication network system exhibiting features corresponding to those of ISDN to which the present invention relates.

The above-mentioned business function related to the present invention is described as follows below:

• A service function called "Call Waiting (CW)" in the following, which signals the B-subscriber that there is a call request addressed to him on a working line. In principle, the B-subscriber may make the following three responses to this: accept, reject or ignore the waiting call.

The B-subscriber may accept the waiting call within a certain predetermined time interval, for which the B-subscriber either has to maintain the original connection or log out of the original connection.

If the B-subscriber keeps the original connection, he can then usually switch between the original connection and the new connection.

This can be signaled by stopping the ringing bell or by a light symbol on the screen.

● A service function called "Call forwarding on busy (DIVBY)" in the following, this service function is busy (occupied) on the line of user B, and user B has activated this service function, indicating that user C is the purpose of call forwarding When on the ground, the call initiated by user A to user B is transferred to user C.

●A service function called "Call Forwarding on No Response (DIVDA)" in the following, which is used when B-subscriber neither accepts nor rejects the call initiated by A-subscriber to B-subscriber, and B-subscriber has activated this service function , when user C is specified as the call forwarding destination, the call is forwarded to user C.

● A service function called "Call Completion with Busy Subscriber (CCBS)" in the following, the operation process of this service function is as follows: if subscriber B is busy when subscriber A calls subscriber B, subscriber A can request to call again. If the request is accepted, the A-subscriber is notified (for example by telephone) as soon as the B-subscriber line becomes available, and the A-subscriber line and the B-subscriber line are subsequently connected. The prerequisite is that user A has the right to use this service.

In the case of ISDN2, the current version of ISDN, which is commonly used today in the private sector, a line has two basic channels usually called B-channels or B-speech channels (in addition to a signaling channel, usually called D-channel or D-signaling channels). In this way, "line busy" means that both voice channels of the subscriber line are in working state (occupied).

If these business functions are incompatible with each other, problems arise when at least two of these business functions involving the same user are simultaneously activated. Three special cases are considered in this regard:

Case 1 - Combination of CW and CCBS:

If an A-subscriber entitled to CCBS calls a B-subscriber, and the B-subscriber line is busy and thus activates call waiting (for calls destined for the B-subscriber), and if the B-subscriber then neither accepts nor rejects the waiting call, Then, after a certain time interval has elapsed, user A will receive a "busy" signal. Then, if the A-subscriber requests CCBS by virtue of the B-subscriber's number, the request is denied. In this case, the A user cannot utilize the CCBS.

Second case - combination of DIVDA and CCBS:

If B-subscriber has activated DIVDA, and then A-subscriber who has access to CCBS calls B-subscriber and B-subscriber line is busy, A-subscriber will receive a "busy" tone signal. If the A-subscriber then requests CCBS by virtue of the B-subscriber's number, the request is denied. In this case, the A user cannot utilize the CCBS.

The third case - combination of CW and DIVBY:

If user B has activated DIVBY and has indicated user C as the destination of call forwarding, and if user B is busy when user A calls user B, but user B neither accepts nor rejects the waiting call, then after a certain period of time After the interval, the A user will receive a "busy" tone signal. Specifically, the call will not be forwarded to the C-subscriber. In this case, A user cannot utilize DIVBY.

In view of the complexities associated with concurrency of service functions, it is an object of the present invention to expand the possibilities for utilizing combinations of user service functions in telecommunication systems.

This object is achieved by the invention as defined in claim 1 appended hereto. Other characteristics of the invention are given in the dependent claims.

According to the present invention, either the call setup initiated by the A user in the telecommunication network system to the B user is transferred to the C user when the B user line is busy, or the service function request of the waiting A user is accepted.

Consider first the case of accepting a business function request.

According to an embodiment of the present invention, if the following conditions are met, the CCBS request to the B user initiated by the A user is accepted:

● User A has the right to use CCBS

● User A’s request is performed after the following steps:

(1) Subscriber B is busy, then subscriber A calls subscriber B

(2) CW is activated

(3) User B neither accepts nor rejects the waiting call

(4) After a certain time interval, user A receives a busy tone

Therefore, the present invention enables user A to benefit more from CCBS than the prior art.

According to another embodiment of the present invention, if the following conditions are met, the CCBS request to the B user initiated by the A user is accepted:

● User A has the right to use CCBS

● Subscriber B has activated DIVDA and indicated that subscriber C is the destination of the call forwarding

● User A’s request is performed after the following steps:

(1) Subscriber B is busy, then subscriber A calls subscriber B

(2) User A receives a busy signal

Also, the present invention enables user A to benefit more from CCBS than the prior art.

Next consider the case of call forwarding.

According to an embodiment of the present invention, if the following conditions are met, the call is transferred to user C:

● Subscriber B has activated DIVBY and indicated that subscriber C is the destination of the call forwarding

● Complete the following steps individually:

(1) Subscriber B is busy, then subscriber A calls subscriber B

(2) CW is activated

(3) Within a certain time interval, user B neither accepts nor rejects the waiting call

(4) After a certain time interval, user A receives a busy tone

Therefore, the present invention enables user A to benefit more from DIVBY than the prior art.

The present invention will be described in detail with reference to the schematic diagram in the accompanying drawings as follows, in the accompanying drawings:

Figure 1A illustrates prior art for combining CW and CCBS;

Figure 1B shows the combination of CW and CCBS after implementing the present invention;

Figure 2A illustrates a prior art technique for combining DIVDA and CCBS;

Figure 2B shows the combination of DIVDA and CCBS after implementing the present invention;

Figure 3A illustrates a prior art technique for combining CW and DIVBY; and

Figure 3B shows the combination of CW and DIVBY after practicing the invention.

FIG. 1A illustrates the combination of service functions CW and CCBS according to the prior art in the form of a schematic flow chart. The thick arrow 1 from top to bottom in FIG. 1A represents time. Line 2 represents A users, and similarly another line 3 represents B users. The telecommunication operation between A user and B user involves various units in the telecommunication network system, such as switches. These parts are indicated by dashed lines 4 .

In Fig. 1A, consider the situation that user A has the right to use CCBS 5.

The arrow 6 indicates that the user line B is busy, and then the user A initiates a call to the user B. The busy line of the user B is represented by the capital letter "BL" 7. A timer is then triggered for counting a time interval 8 during which the B-subscriber can accept or reject the waiting call. This is the business function CW. In the situation shown in Figure 1A, the B-subscriber has neither accepted nor rejected the waiting call, which is indicated in Figure 1A by capital letters "AC" and "RE" 9 respectively with cancel marks.

After said time interval has expired, the A-subscriber receives a "busy" tone signal, indicated by the capital letters "BT" 11 . Subsequently, user A requests 12 CCBS. The request 12 is forwarded to a certain element in the telecommunication network system 4, such as a switch. Eventually, the A-user is notified 13 that the request has been denied, as indicated by the capital letters "RE" 14 .

Fig. 1B shows a situation in which the present invention is applied. All numbers, signs and symbols have the same meanings as in Fig. 1A. Compared with FIG. 1A , the difference is that the CCBS request 12 initiated by user A is accepted, as indicated by capital letters "AC" 15 .

Subsequent parts of the CCBS program follow exactly the existing operations of the CCBS program.

FIG. 2A illustrates the combination of service functions DIVDA and CCBS according to the prior art in the form of a schematic flow chart. Wherein, if not marked otherwise, all numbers, signs and symbols have the same meanings as those in FIG. 1A.

In Fig. 2A, consider the situation that user A has the right to use CCBS 5 and user B has activated DIVDA16.

Arrow 6 indicates that the line of B subscriber is busy 7 and then A subscriber initiates a call to B subscriber. Subscriber A then receives a "busy" tone signal 11. Then, user A requests CCBS. Finally the request is rejected 13 as indicated by capital letters "RE" 14 .

FIG. 2B shows the same situation as that shown in FIG. 2A after implementing the present invention. All numbers, signs and symbols have the same meanings as in Fig. 2A. The difference is that the A-subscriber's CCBS request 12 is accepted, as indicated by the capital letters "AC" 15 .

Subsequent parts of the CCBS program follow exactly the existing operations of the CCBS program.

FIG. 3A illustrates the combination of service functions CW and CCBS according to the prior art in the form of a schematic flow chart. Wherein, unless otherwise marked, all numbers, signs and symbols have the same meanings as those in the above-mentioned figures.

Consider the situation where the B subscriber has activated the DIVDA 17 and indicated the C subscriber 30 as the call forwarding destination in Fig. 3A.

Arrow 6 indicates that the line of B subscriber is busy 7 and then A subscriber initiates a call to B subscriber. A timer is then started for counting the time interval 8 during which the B-subscriber can accept or reject the waiting call. This is the business function CW. In the situation shown in Figure 3A, the B-subscriber has neither accepted nor rejected the waiting call, indicated respectively by capital letters "AC" and "RE" 9 with cancel marks.

In particular, the call was not forwarded.

After said time interval has expired, the A-subscriber receives a "busy" tone signal 11 .

FIG. 3B shows the same situation as that shown in FIG. 3A after implementing the present invention. All numbers, signs and symbols have the same meanings as in Fig. 3A. The difference is that the call initiated by the A-subscriber is forwarded 31 to the C-subscriber after another time interval 32 has elapsed.

In the embodiment shown in this figure, this time interval 32 is within the first time interval 8, ie before the A-subscriber receives the "busy" signal, the call is forwarded. However, the time interval 32 can be determined in any other way as long as it is proven that the transfer step was performed.

Advantages of the present invention can be summarized as follows:

● When DIVDA and CCBS or DIVDA and CCBS overlap in time, compared with the prior art, the present invention enables users to benefit more from the service function CCBS.

When CW and DIVDA overlap in time, compared with the prior art, the present invention enables users to benefit more from the service function DIVBY.

Claims (12)

1. A method for allowing interaction of service functions in a telecommunication network with service functions supporting communication between A, B, and C users, said method comprising the steps of: If the B-subscriber (3) line is busy (7), but the B-subscriber (3) neither accepts nor rejects (9) the incoming call (6) from the A-subscriber (2), then either The call is transferred (31) to said C-subscriber (30), or the service function request (12) of said waiting A-subscriber (2) is accepted (15). 2. The method of claim 1, wherein: If the B subscriber line (3) is busy (7), the A subscriber (2) calls (6) the B subscriber (3), and then the A subscriber (2) requests the first service function, then The first service function establishes a connection between the A-subscriber (2) and the B-subscriber (3), wherein the connection is established as soon as the B-subscriber line (3) becomes available. 3. The method according to claim 1 or 2, characterized in that: The second service function signals the subscriber that the subscriber's line is busy (7), while another call is waiting on the line. 4. The method of claim 3, wherein: A call from said A-subscriber (2) activates said second service function and the step is to accept (15) said A-subscriber (2) request (12) for said first service function. 5. The method according to claims 1 to 4, characterized in that: If the B-subscriber (3) neither accepts nor declines (9) the call (6) intended for him, and the B-subscriber (3) has indicated the C-subscriber number as the destination of the call forwarding, then A third service function will transfer the call (6) to the C-subscriber (30). 6. The method of claim 5, wherein: A call from said A-subscriber (2) activates said third service function and said step is accepting (15) said A-subscriber (2) request (12) for said first service function. 7. The method of claim 1, wherein: After a preset time interval (32), said step of transferring said call (6) is performed. 8. The method of claim 7, wherein: If the B-subscriber line (3) is busy (7), and the B-subscriber (3) has indicated the C-subscriber (30) number as the destination of the call transfer, the fourth service function will The call (6) of the B-subscriber (3) is forwarded (31) to said C-subscriber (30). 9. The method of claim 9, wherein: Said step is transferring (31) said call (6) to said C-subscriber (30) within said fourth service function. 10. The method according to claim 9 or 10, characterized in that: The second service function signals the subscriber that the subscriber's line is busy (7) while another call is being initiated on the line. 11. The method of claim 11, wherein: A call (2) from said A-subscriber (2) activates said second service function and said step is transferring (31) said call (6) to said C-subscriber within said fourth service function (30). 12. A method as claimed in claims 1 to 12, wherein said telecommunication network is an Integrated Services Digital Network (ISDN).

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