EP1258130A2

EP1258130A2 - Signalling of a call in a telecommunications system between a base station and a mobile component

Info

Publication number: EP1258130A2
Application number: EP01913575A
Authority: EP
Inventors: Michael Beckers; Hans-Georg Beerens; Rolf Biedermann; Christoph Lenfort; Georg Schmitz
Original assignee: Siemens AG
Current assignee: Siemens AG
Priority date: 2000-02-23
Filing date: 2001-02-06
Publication date: 2002-11-20
Also published as: WO2001063884A2; WO2001063884A3; US20030096615A1; DE10008241A1

Abstract

The invention relates to a base station to which especially more mobile components are allocated than the number of radio channels provided. The base station signals an incoming connection request to the mobile components in such a way that said station establishes a bidirectional connection to one of the mobile components after the connection request has been received, whereby the base station thus signals the incoming connection request and subsequently suppresses said request. This is sequentially repeated by means of at least one component of the mobile components. In addition, the base station can simultaneously establish a unidirectional connection to all mobile components and signal the incoming connection request immediately after the connection request has been received.

Description

description

Call signaling in a telecommunications system between a base station and a handset

The invention relates to a method for signaling calls in a telecommunications system between a base station and a handset.

In message systems with a message transmission link between a message source and a message sink, transmitting and receiving devices are used for message processing and transmission in which

1) the message processing and message transmission can take place in a preferred transmission direction (simplex operation, unidirectional) or in both transmission directions (duplex operation, bidirectional), 2) the message processing is analog or digital, 3) the message transmission over the long-distance transmission path the basis of various message transmission methods FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access) and / or CDMA (Code Division Multiple Access) - e.g. B. according to radio standards such as DECT, GSM, WACS or PACS, IS-54, PHS, PDC etc. [cf.

IEEE Communications Magazine, January 1995, pages 50 to 57; D. D. Falconer et al: 'Time Division Multiple Access Methods for Wireless Personal Communications'].

'Message' is a generic term that stands for both the meaning (information) and the physical representation (signal). Despite the same meaning of a message - that is, the same information - different signal forms can occur. For example, a message related to an object (1) in the form of an image,

(2) as a spoken word,

(3) as a written word,

(4) as an encrypted word or image

be transmitted. The transmission type according to (1). , , (3) is usually characterized by continuous (analog) signals, whereas the transmission type according to (4) usually produces discontinuous signals (eg impulses, digital signals). Based on this general definition of a messaging system, the invention relates to a cordless telecommunications system with cordless telecommunications applications, in particular a GAP-specific DECT system.

According to the DECT standard, a maximum of 12 connections can be made at a DECT base station via a DECT air interface designed for the frequency range between 1.88 and 1.90 GHz using the TDMA / FDMA / TDD procedure (Time Division Multiple Access / Frequency Division Multiple Access / Time Division Duplex) can be set up parallel to DECT handsets. The number 12 results from a number k of time slots or telecommunication channels available for the duplex operation of a DECT system (k = 12). The connections can be internal and / or external. With an internal connection, two handsets registered on the base station can communicate with each other. For establishing an external connection, the base station is e.g. B. connected via a telecommunications unit or a private branch exchange to a telecommunications network. With the external connection, one can communicate with a handset via the base station, the telecommunications connection unit or private branch exchange with a subscriber in the telecommunications network. As in the case of the Gigaset 951 (Siemens cordless phone, see telcom report 16, (1993), number 1, pages 26 and 27), the base station has only one connection to the telecommunications tion connection unit or the private branch exchange, only an external connection can be established.

Starting from the simple DECT system, which is preferably used for the private sector, DECT system applications, such as B. in small public areas, conceivable in which a number n of handsets with n> k are connected to a base station via the DECT air interface.

Occurs in such a system that a base station, the z. B. can be designed as an antenna diversity base station, the wish of a distant telecommunications subscriber from the telecommunications network to connect to one of the mobile parts in a telecommunications connection is signaled, the base station must communicate this to the mobile parts assigned to it. This message is given, for example, by the fact that the handsets are ringing (acoustic signal). Alternatively, other forms of display are also possible (e.g. visual display).

The notification of the base station to the mobile stations that a further telecommunications subscriber from the telecommunications network wants to connect to one of the mobile parts is carried out simultaneously by a unidirectional radio connection (dummy bearer, traffic bearer) from the base station to all the mobile parts assigned to it.

With this type of message, however, there is uncertainty as to whether the signaling of an existing connection request has been received by all handsets.

The object underlying the invention is to specify a method for calling a number n of mobile units assigned to a base station.

This object is solved by the features of claim 1 and the features of claim 2. According to claim 1, a connection request coming from a remote telecommunication subscriber of a telecommunication network connected to a base station is signaled to all n mobile parts assigned to the base station, in that the base station starts with a first mobile part of the n mobile parts in succession with at least some of the n mobile parts, for example at least n- ( k + l) handsets, each set up a short-term bidirectional radio connection, exchanges data with the first handset via this bidirectional radio connection and then triggers the bidirectional radio connection, the data containing at least one message that signals the incoming connection request and the respective handset the incoming one Connection request indicated by call signaling.

The main advantage of the inventive method according to claim 1 is the possibility of checking whether the signaling of the incoming connection request has arrived at the respective handset (secure call signaling), so that the base station can carry out alternative methods according to the result of the check, where appropriate the sequential sequence for signaling only one radio channel is necessary.

According to claim 2, a connection request coming in from a remote telecommunication subscriber of a telecommunication network connected to a base station is signaled at the same time by at least a part of the n mobile parts assigned to the base station by a unidirectional radio connection, which in particular in wireless telecommunication systems functioning according to the DECT standard, constantly between base station and all handsets are available, is used so that all handsets are transmitted almost simultaneously, by transmitting data via the respective unidirectional radio link, which contains at least one message that signals the incoming connection request, indicates by call signaling and then, starting with a first handset of the n handsets, successively establishes a short-term bidirectional radio connection with at least a part of the n handsets, exchanges data with the first handset via this bidirectional radio connection and then triggers the bidirectional radio connection.

The essential advantage of the method according to the invention as claimed in claim 2 is the possibility of checking whether the signaling of the incoming connection request has arrived at the respective mobile part, so that the base station can carry out alternative methods according to the result of the check, with this check subsequently the incoming connection is signaled simultaneously and this signaling is not delayed.

This is used particularly advantageously in a telecommunications system in which more mobile parts are assigned to a base station than radio channels are available (n> k).

If a handset that accepts the incoming connection request sets up a bidirectional radio connection to signal the acceptance, a data exchange, in particular the call connection, can take place with the remote subscriber via this radio connection, and the base station can also inform the remaining mobile parts of the end of the connection request.

The main advantage of the further developments according to claims 6 and 7 is an immediate signaling of the acceptance of the incoming connection request to the remaining mobile parts, wherein the further development according to claim 5 also enables a check as to whether the signaling of the acceptance has arrived for all remaining mobile parts , The main advantage of the developments according to claim 8 and claim 9 is the refreshing of the signaling of the incoming connection request, this refreshing can be checked on arrival in the respective handset and avoids a delay in signaling according to claim 8 by sequential checking after the simultaneous signaling expires.

The advantage of the development according to claim 10 is the secure active termination of the refresh by the base station.

The main advantage of the further developments according to claims 11 and 12 is the assured active termination of the refreshment, the further development according to claim 12 also allowing a check to be made to see whether the request to terminate has been received by all the remaining handsets.

The main advantage of the development according to claim 13 is the possibility of ensuring that the refreshing of the signaling is ended safely without having to establish a radio connection from the base station to one of the mobile parts.

Advantage of the development according to claim 14 and claim 15 is the immediate display of the change in data associated with the incoming connection request and transmission of the same.

In order to ensure that messages directed to the base station are also possible during the call, the development according to claim 16 is advantageous.

The development according to claim 17 provides a simple collision treatment which, if a handset, for example according to claim 15, transmits a message to the base station. wants to and cannot establish the necessary radio connection, since all radio channels are occupied, depending on the content of the message enables a differentiated reaction.

Exemplary embodiments of the invention are explained with reference to FIGS. 1 to 3. Show:

FIGURE 1 A flowchart of a method with signaling, checking the signaling and ending the call signaling via bidirectional radio connections. FIGURE 2 A flow diagram of a method with signaling and ending the call signaling via unidirectional radio connections and checking via bidirectional radio connections. FIGURE 3 A flow diagram of a method with signaling via unidirectional radio connections and checking via bidirectional radio connections and termination of the call signaling after a timer query.

The flowchart shown in FIG. 1 shows the states of a base station BS and their associated mobile parts MTi ... MT _n , the states of the mobile parts MT ₂ to MT _n -ι not being drawn to simplify the sequence of the states of the mobile part MT _n correspond.

In the initial state, all three of the entities shown are in the REST state. Upon an incoming connection request from an external remote subscriber, which is signaled to the base station BS by a telecommunications network TKN to which the base station is connected, the base station BS changes to the RUF state.

In the RUF state, the base station BS begins the incoming connection requests to its assigned mobile parts MTi ... MT _N to signal the handsets. For this purpose, the base station BS successively sets up a bidirectional radio connection with one of the mobile parts MTi ... MT _n assigned to the base station BS, the radio connection being set up in a known manner. The respective MTi ... MT _n handset exchanges data, call patterns, display messages, language settings, etc. with this base station via this radio link (communication), whereupon the base station then clears the bidirectional radio link to the respective MTi ... MT _n handset and the respective handset MT _X ... MT _{n changes} to the RUF state, ie the subscriber (user) of the respective handset MTi ... MT _n is signaled an incoming call, for example by ringing, vibrating or visual display.

Now, as shown in Figure 1, a first handset MTi accepts the connection request (subscriber accepts the call, for example by pressing a key), ie the handset MTi goes into the CALL ACCEPTED state, the first handset MTi establishes a bidirectional radio connection and Via this radio connection, a call is processed with the external subscriber, which puts both the base station BS and the first mobile part MTi in the TALK state and whereupon the base station BS informs the remaining mobile parts MT ₂ ... MT _{n of} the end of the connection request signaled.

For this purpose, the base station BS again successively sets up a bidirectional radio connection to the remaining mobile parts MT ... MT _n , exchanges data with the respective mobile part MT ₂ .. MT _n via this connection, which contains, among other things, the information that the end of the connection request has occurred or the first mobile part MTi has accepted the incoming connection request and then closes off the radio connection in each case. After evaluating the information, the respective handset MT ₂ ... MT _n goes into the REST state.

After the call between the external subscriber and the first mobile part MTi has ended, the existing bidirectional radio connection between the first mobile part MTi and the base station BS is cleared, whereupon the first mobile part MTi and the base station BS return to the REST.

The flowchart shown in FIG. 2 likewise indicates the states of a base station BS and their associated mobile parts MTi ... MT _n , the states of the mobile parts MT ₂ to MT _n _ι not being drawn to simplify the sequence of the states of the mobile part MT _n correspond.

In contrast to the method explained in FIG. 1, in the method explained in FIG. 2, the base station BS uses a unidirectional radio connection that is usually present in a DECT system to the respective mobile parts MTi... MT _n assigned to it The system functioning according to the DECT standard is, for example, a dummy bearer or a traffic bearer, via which all incoming handsets MTi ... MT _{n are} simultaneously signaled the incoming connection request, whereupon each of the handsets MTi ... MT _n in changes to the RUF state and signals the incoming connection request to the respective user, for example by ringing.

After the signaling via the respective unidirectional radio connection has ended, the base station BS builds one after the other a bidirectional radio connection, each with one of the mobile parts MTi ... MT _n assigned to the base station BS, the radio connection being set up in a known manner, for example in accordance with the DECT standard. The respective mobile unit MTi ... MT _n exchanges data, call patterns, display messages, language setting, etc. with this base connection (communication), the base station BS checking by evaluating the data whether the previous signaling of the incoming Connection request via the unidirectional radio connection was received by the respective handset MTi ... MT _n or not. Then the bidirectional radio connection is released again and the same steps are repeated with a next one of the mobile parts MTi ... MT _n until all n mobile parts MTi ... MT _{n have changed} to the CALL state and this has been checked.

After a preset time in the base station has elapsed, if the incoming connection request has not been accepted by one of the mobile parts MTi ... MT _n , the signaling of the connection request to the mobile parts M i ... MT _n is refreshed performed.

For this purpose, the base station BS uses the existing unidirectional radio connection (dummy bearer, traffic bearer) to all mobile parts MTi ... MT _n , in which the continuation of the incoming connection is signaled via the respective unidirectional radio connection, so that the mobile parts MTi ... MT _{n continue} the call signaling (ringing tone).

In addition, the signaling of the continued existence of the incoming connection request can be checked by establishing a bidirectional radio connection to a mobile part MTi ... MT _n , exchanging data and then clearing down the bidirectional radio connection sequentially continuing this procedure. Alternatively, it is also possible to continue the renewal of this procedure sequentially only by establishing a bidirectional radio connection to one mobile part MTi ... MT _n , exchanging data that contains the continuation of the incoming connection request, and then clearing down the bidirectional radio connection , signaled and checked at the same time.

If the incoming connection request is accepted by a subscriber, for example by pressing a button, on the mobile part MTi according to FIG. 2, the base station BS and the mobile part MTi go into the TALK state and the base station signals the remaining mobile parts MT ₂ ... MT _n the end of the incoming connection request, whereby an existing unidirectional radio connection (dummy bearer, traffic bearer) to the remaining mobile parts MT ₂ ... MT _{n is} used at the same time.

The remaining handsets MTi ... MT _n then go into the REST state.

After the call connection between the external subscriber and the first mobile part MTi has ended, the bidirectional radio connection is also cleared down immediately, so that both the first mobile part MTi and the base station BS go into the REST state.

FIG. 3 shows how the method explained in FIG. 2 proceeds when an incoming connection request comes to an end before the incoming connection request is accepted.

Ie a first signaling of an incoming connection request and a check is carried out in accordance with the method explained in FIG. Alternatively, it can also be carried out according to the method explained in FIG. 1.

After checking, the signaling of the incoming connection request is renewed regularly at the same time intervals, in a known manner - stimulated by the base station - in accordance with the method described in FIG. 2, so that the mobile parts MTi ... MT _n each call signaling can continue, with each incoming renewal of the signaling the respective handset MTi ... MT _n starts a timer that can be set after a predetermined time, which is permanently implemented in the handset or as a parameter, in which no further renewal of the signaling takes place , the call signaling of the handset MTi ... MT _n ends, so that it changes to the REST.

Alternatively, one can instead actively end the call signal with the aid of signaling by the base station BS, this being done, for example, simultaneously by using the respectively existing unidirectional radio connection to all the mobile parts MTi ... MT _n or alternatively by establishing a bidirectional radio connection with Subsequent data exchange and removal of the radio connection to a handset and sequential continuation of this process until all handsets MTi ... MT _n the end of the call has been signaled.

Alternatively, a signaling or notification from one of the mobile parts MT _X ... MT _n , which is in the RUF state, can be directed to the base station BS, the mobile part MTi ... MT _{n establishing} a radio connection to the base station BS for this purpose, data containing the message is transmitted to the base station BS and the radio connection is subsequently terminated. This radio connection can be unidirectional from the mobile station MTi ... MT _n to the base station BDS, but alternatively it can also be bidirectional.

Regardless of the variant of the radio connection, there is the possibility that no radio channel is free, so that there is no radio connection.

In such a case, the handset MTi ... MT _n can generally reject the message, ie abort the attempt to establish a radio connection.

Alternatively, the methods explained in FIGS. 1 to 3 can be expanded to the effect that the mobile unit MTi ... MT _n depends on the content, ie possible contents are prioritized according to their content, the attempt to establish a radio connection is terminated or, for example, stimulated by a timer en attempted to establish the radio connection.

Claims

claims

1. Method for signaling calls in a telecommunication system with wireless telecommunications between a base station (BS) and a mobile part (MTi ... MT _n ), the base station (BS) having a number of “n” mobile parts (MTi ... MT _n ) is assigned and a number "k" of radio channels is available, with the following features: a) The base station (BS) builds an incoming connection request signaled by a telecommunications network (TKN) of the base station (BS) to a first handset (MTj.rn.it l≤x≤n) of the n handsets (MTi ... MT _n ) a bidirectional radio connection, b) the base station (BS) exchanges with the first handset (MT _> with l≤ x≤n) via the bidirectional radio connection

Data from, c) the base station (BS) signals the first handset

(MT _X with l≤x≤n) through the data exchanged via the radio connection the incoming connection request, d) the first handset (MT-, with l≤x≤n) indicates the signaled connection request by appropriate call signaling, e) the base station (BS) triggers the bidirectional connection with the first handset (MT with l≤x≤n), the call signaling on the first handset (MT _y with l≤x≤n) being retained, f) steps a) to e) are carried out sequentially with a first handset group which detects a part of the handset (MT ^ ... MT _n ).

2. Method for signaling calls in a telecommunication system with wireless telecommunications between a base station (BS) and a mobile part (MTi ... MT _n ), the base station (BS) having a number of "n" mobile parts (MTi .. . MT.,) And a number-l "k" of radio channels is available, with the following features: a) The base station maintains a unidirectional radio connection to a first handset group that detects a part of the handsets (MT _X ... MT _n ), b) the base station (BS) signals the base station to one of a telecommunications network (TKN) (BS) signaled incoming connection request of the first handset group at the same time the incoming connection request via the unidirectional radio connection, c) the handsets in the first handset group indicate the signaled connection request by corresponding call signaling, d) the base station (BS) ends the signaling of the connection request via the unidirectional Radio connection, e) the base station (BS) builds a bidirectional with a first handset (MT _X with l≤x≤n) of the first handset group

Radio connection open, f) the base station (BS) exchanges data with the first handset (MT _X with l≤x≤n) via the bidirectional radio connection, g) the base station (BS) releases the bidirectional connection with the first handset (MT _X with l≤x≤n), h) steps e) to g) are carried out sequentially with the first handset group.

3. The method according to any one of claims 1 or 2, characterized in that the number "n" of the mobile parts (MTi ... MT _n ) assigned to the base station (BS) is smaller than the number "k" of the radio channels, ie the designation "n> k "applies.

4. The method according to any one of the preceding claims, characterized in that a) an acceptance of the incoming connection request ^' by a second handset (MT _y with l≤y≤n) of the first handset group by one of the second handset (MT _y with l≤y≤n) initialized establishment of a bidirectional radio connection to the base station (BS), b) after the bidirectional radio connection has been set up, the base station (BS) indicates the end of the incoming connection request to the remaining mobile parts of the first handset group.

5. Method according to claim 4, characterized in that the first mobile part (MT _X with l ≤x ≤n) is also the second mobile part (MT _y with l ≤ y≤n).

6. The method according to claim 4 or 5, characterized in that the end of the incoming connection request is displayed such that a) the base station (BS) with a third handset (MT ₂ with l≤z≤n) of the remaining handsets of the first handset group establishes a bidirectional radio connection, b) the base station (BS) signals the end of the incoming connection request to the third handset (MT _Z with l≤z≤n)) with the data exchanged via the radio connection, c) the third handset (MT _Z with l≤z≤n)) sets the call signaling, d) the base station (BS) triggers the bidirectional connection with the third handset (MT _Z with l≤z≤n)), e) steps a) to d) become with a second handset group, which detects at least a part of remaining handsets of the first handset group.

7. The method according to claim 4 or 5, characterized in that the end of the incoming connection request is displayed in such a way that a) the base station to a third handset group, which detects at least part of the remaining handsets of the first handset group, is unidirectional Maintains radio communication, b) the base station (BS) of the third handset group simultaneously signals the end of the incoming connection request via the unidirectional radio connection, c) the handsets of the third handset group set the call signaling, d) the base station (BS) ends the signaling of the connection request via the unidirectional radio connection.

8. The method according to any one of claims 1 to 3, characterized in that the signaling of the incoming connection request is renewed such that a) the base station (BS) to the first handset (MT _X with l≤x≤n) has a bidirectional radio connection establishes, b) the base station (BS) exchanges data with the first handset (MT _X with l≤x≤n) via the bidirectional radio connection, c) the base station (BS) with the first handset (MT _X with l≤x≤n) the incoming connection request is signaled by the data exchanged via the radio connection, d) the first handset (MT _X with l≤x≤n) indicates the signaled connection request to the subscriber by means of appropriate call signaling, e) the base station (BS) shows the bidirectional connection to the first Handset (MT _X with l≤x≤n) triggers, with the

Call signaling on the first handset (MT _X with l≤x≤n) is retained, f) steps a) to e) are carried out sequentially with a first handset group that detects a part of the handsets (MTi ... MT _n ) g) steps a) to f) are repeated cyclically.

9. The method according to any one of the claims. 1 to 3, characterized in that the signaling of the incoming connection request is renewed in such a way that a) the base station maintains a UNIDI ^{¬-directional} radio link to a first mobile sub-group, which detects a portion of the mobile parts (MTi ... MT _n), b) the base station (BS) of the first mobile sub-group at the same time the incoming call request via the unidirectional Radio connection signals, c) the handsets of the first handset group indicate the signaled connection request by appropriate call signaling, d) the base station (BS) ends the signaling of the connection request via the unidirectional radio connection, e) steps a) to d) are repeated cyclically.

10. The method according to any one of claims 8 or 9, characterized in that the call signaling of the incoming connection request by the respective handset of the first handset group takes place until the base station (BS) signals the end of the connection request to the respective handset de first handset group.

11. The method according to claim 10, characterized in that the base station (BS) indicates the end of the incoming connection request in such a way that a) the base station to a first handset group that detects a part of the mobile parts (MTi ... MT _n ) maintains a unidirectional radio connection, b) the base station (BS) of the first handset group simultaneously signals the end of the connection request via the unidirectional radio connection, c) the base station (BS) ends the signaling of the end of the incoming connection request via the unidirectional radio connection.

12. The method according to claim 10, characterized in that the base station (BS) of the end of the incoming

Indicates connection request such a) the base station (BS) establishes a bidirectional radio connection to the first handset (MT _X with l≤x≤n), b) the base station (BS) with the first handset (MT _X with l≤x≤n) via the bidirectional Radio connection exchanges data, c) the base station (BS) signals the first mobile part (MT _X with l≤x≤n) by the data exchanged via the radio connection the end of the incoming connection request, d) the base station (BS) the bidirectional connection triggers with the first handset (MT _X with l≤x≤n), e) steps a) to d) are carried out sequentially with the first handset group, which detects some of the handsets (MTi ... MT _n ).

13. The method according to any one of claims 8 or 9, characterized in that the call signaling of the incoming connection request by the respective handset of the first handset group takes place until a timer of the respective handset of the first handset group, the one since the last signaling of incoming connection request elapsed time, a predetermined value of the time (TIMEOUT) reached.

14. The method according to any one of the preceding claims, characterized in that changes in data associated with the incoming connection request are transmitted to the n mobile parts (MTi ... MT _n ) such that a) the base station (BS) to the first mobile part (MT _X with l≤x≤n) establishes a bidirectional radio connection, b) the base station (BS) transmits the changed data assigned to the connection request to the first mobile part (MT _X with l≤x≤n) by exchanging the bidirectional radio connection Base station (BS) triggers the bidirectional connection with the first handset (MT _X with l≤x≤n), d) steps a) to c) are carried out sequentially with the first handset group, which detects a part of the handset (MTi ... MT _n ).

15. The method according to any one of the preceding claims, characterized in that changes of data associated with the incoming connection request are transmitted to the n mobile parts (MTi ... MT _n ) in such a way that a) the base station forms a part of a first mobile part group of the mobile parts (MTi ... MT _n ), maintains a unidirectional radio connection, b) the base station (BS) of the first handset group simultaneously transmits the changed data associated with the connection request via the unidirectional radio connection, c) the base station (BS) transmits the transmission the unidirectional radio connection ended.

16. The method according to any one of the preceding claims, characterized in that for a transmission of a message directed from a mobile part of the first handset group to the base station (BS) such that a) the handset of the first handset group establishes a radio connection to the base station (BS) , b) the handset of the first handset group that transmits data directed to the base station, c) the handset of the first handset group clears the radio connection.

17. The method according to claim 16, characterized in that in the case of an occupancy of all available radio channels, a) the mobile station of the first handset group with low priority of the data directed to the base station (BS) does not establish a radio connection and which to the base station (BS ) discards targeted data, the mobile station of the first handset group with high priority of the data directed to the base station (BS), bl) starts a timer, b2) tries to establish a new radio connection when a predetermined value of the time has been reached, b3) the steps are taken when all available radio channels are occupied bl) and b2) repeated.