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

description

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

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

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

1) the message processing and message transmission in a preferred transmission direction (simplex operation, unidirectional) or in both transmission directions (duplex operation, bidirectional) can be carried out, 2) the message processing is analog or digital, 3) the message transmission via the remote transmission route on the basis of various communication method FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access) and / or CDMA (code Division Multiple Access) -., for example, according to radio standards, such as DECT, GSM, WACS or PACS, IS-54, PHS, PDC, etc. [see.

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

'Message' is a generic term that stands both for the meaning content (information) and the physical representation (signal). Despite the same meaning content of a message - say the same information - different signal forms may occur. Thus, for example, a s- concerned an object message (1) m the form of an image,

(2) as the spoken word,

(3) as the written word,

(4) as an encrypted word or image

be transmitted. The transmission according to (1). , , (3) is thereby normally characterized by continuous (analog) signals, while the type of transmission according to (4) are normally discontinuous signals (eg. As pulses, di- gital signals) occur. Starting from this general definition of a message system, the invention relates to a cordless Telekommunikationssysteru with cordless telecommunications applications, in particular a GAP specif rule DECT system.

According to the DECT standard can on a DECT base station via a fr the frequency range 1.88 to 1.90 GHz designed DECT air interface a maximum of 12 connections according to the TDMA / FDMA / TDD method (Time Division Multiple Access / Frequency Division Multiple Access / Time Division duplex) are constructed parallel to DECT handsets. The number 12 results from a number of k for duplex operation of a DECT system supply available.??Pets standing time slots or telecommunications channels (k = 12). The compounds may be internal and / or external. In the case of an internal connection, two registered at the base station handsets can communicate with each other. To set up an external connection, the base station z. B. onsanschlußemheit a telecommunications or a PBX connected communication network to a telephone. Given the external connection can be with a handset via the base station, the Telekom unikationsanschlußeinheit or PBX to communicate with a participant m the telecommunications network. Does the base station - as in the case of the Gigaset 951 (. Siemens cordless telephone, cf. Telcom Report 16 (1993), Issue 1, pages 26 and 27) - only one connection to the telecommunications tion terminal unit or the PBX, so only one external connection can be established.

Starting from the simple, preferably used for the private sector DECT system are now applications DECT Systemanwen-, z. B. in public retail area, conceivable in which an n number of handsets with n> k over the DECT air interface with a base station are connected.

If in such a system the case that a base station, the z. B. can be configured as antenna diversity base station, the desire of a remote telecommunication subscriber of the telecommunications network to enter into telecommunication link with one of the handsets, is signaled, the base station must be notified of this with its affiliated handsets. This communication takes place for example in that it rings with the handsets (acoustic indication). Alternatively, other display formats are possible (eg. As visual display).

The message of the base station to the mobile stations that a remote telecommunication subscriber of the telecommunications network with one of the handsets will contact, is carried out simultaneously by a unidirectional radio link (dummy bearer, Trafic-Bearer) of the base station to all assigned handsets.

However, there is an uncertainty as to whether the signaling of an existing connection desire has arrived at all handsets With this type of communication.

The object underlying the invention is to provide a method for calling a number n of a base station associated handsets.

This object is achieved by the features of claim 1 and the features of claim. 2 According to claim 1 a from a remote telecommunication subscriber a connected to a base station telecommunication network for incoming connection request is all n the base station associated handsets signaled by the base station starting with a first handset of n handsets successively with at least a portion of the n handsets, for example, at least n- ( k + l) handsets, each constituting a short-time bi-directional radio connection via this bidirectional radio link with the first mobile unit exchanges data and subsequently triggers the bidirectional radio connection, the data including at least a message, signaling the incoming connection request, and the relevant handset to the incoming connecting wish indicating by call signaling.

The main advantage of the 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 according to the result of the review, if necessary, may perform alternative method wherein Due the sequential nature of the signaling only one radio channel is required in total.

According to claim 2 a from a remote telecommunication subscriber a connected to a base station telecommunication network for incoming connection request is at least part of the base station associated n handsets simultaneously signaled by adding thereto a unidirectional radio link, particularly in functioning according to the DECT standard wireless telecommunication systems constantly between base station is and all other handsets available, is used so that all handsets almost simultaneously, by transmitting data via the respective unidirectional radio link, containing at least one message that signals the incoming connection indicating by call signaling and thereafter, starting with a first mobile portion of the n mobile parts, in succession with at least a portion of the n mobile parts each constituting a short-time bi-directional radio connection via this bidirectional radio link with the first mobile unit exchanges data and subsequently triggers the bidirectional radio connection.

The main advantage of the method GE measure to claim 2 is the possibility of checking whether the signaling of the incoming connection request has arrived at the respective handset so that the base station according to the result of the review may perform alternative method wherein the by the review terminal carried out the simultaneous signaling of the incoming connection and does not delay this signaling.

In a telecommunications system in which a base station more handsets are assigned as radio channels are available (n> k), which is used particularly advantageously.

Builds an incoming connection request and adopts handset for signaling the acceptance of a two-way radio link can this technology, a data exchange, in particular the call, held to the remote partner and also the base station can inform the remaining handsets over the end of the connection request.

The main advantage of further developments according to claim 6 and 7 is a direct signaling the acceptance of the incoming call request to the remaining handsets, the development according to claim 5 in addition to check again whether the signaling of adoption -is arrived with all remaining handsets allows , The main advantage of further developments according to claim 8 and claim 9 is the rejuvenation of the signaling of the incoming call request, which refresh arrive on can be checked in each handset and according to claim 8, a delay of the signaling avoids by sequential inspection following simultaneous signaling expires.

Advantage of the development according to claim 10 is the gesicher- te active terminating the refresh by the base station.

The main advantage of further developments according to claim 11 and 12 is research the secured active terminating Wiederauffri-, the development according to claim 12 furthermore still checking whether the requirement of stopping has been received by all the remaining handsets possible.

The essential advantage of the development according to claim 13 is the ability to ensure a secure end the refresh signaling without having to establish a radio link from the base station to one of the handsets.

Advantage of the development according to claim 14 and claim 15 is the immediate display of changes in associated to inbound connection request data and transmitting the same.

To ensure these are addressed also to the base station during the call messages possible is the development according to claim 16 is advantageous.

The development according to claim 17 provides a simple collision handling, which, if a handset, for example, according to claim 15, a message deliv- to the base station stuffs wants and if the required radio link can not build because all radio channels are occupied, depending on the content of the message enables a differentiated response.

Embodiments of the invention will be explained with reference to FIGS. 1 to 3 They show:

FIGURE 1 A flowchart of a method of signaling, checking of signaling and terminating the call signaling via bidirectional radio links. FIGURE 2 A flowchart of a method of signaling and terminating the call signaling over unidi--directional radio links and checking via bidirectional radio links. 3 shows a flow diagram of a method of signaling on unidirectional radio connections and verifying via bi-directional radio, and terminating the call signaling to timer query.

The flow chart shown in Figure 1 are the states of a base station BS and its associated handsets MTi ... MT_n on which to simplify the conditions of the mobile sets MT₂ to MT_nHowever -ι not drawn are the sequence of states of the mobile handset MT_n correspond.

In the initial state, all three sitter ends titäten in state CALM. On an incoming call request to an external remote operator of the base station BS through a telecommunication network TKN to which the base station is connected is signaled, the base station BS enters the state RUF.

In state RUF base station BS begins its associated handsets MTi ... MT_N the incoming connection to signal the handsets. For this purpose, the base station BS builds in succession with in each case one of the base station BS associated handsets MTi ... MT_n a two-way radio link, wherein the structure of a radio communication takes place in a known manner. About this radio link exchanges each handset MTi ... MT_n with the base station BS data Rufpattern, display messages, language setting, etc., of (communication), whereupon then the base station, the bidirectional radio link to the respective handset MTi ... MT_n degrades and the respective handset MT_X ... MT_n merges into the state RUF, ie the subscriber (user) of each handset MTi ... MT_n is signaled, for example, by ringing, vibrating or visual display an incoming call.

Referring now, as shown in Figure 1, a first handset MTi the connection request to (participant accepts appointment, for example, by pressing a button on), ie the handset MTi enters the state ANSWER, a bidirectional radio connection is set up from the first handset MTi and conducted via this wireless connection, a call connection to the external party, this being offset both the base station BS and as well as the first handset MTi in the state tALK and after which the base station BS bilteilen the remaining motor MT₂ ... MT_n the end of Verbindungsswunsches signaled.

For this, the base station BS is building again, one after the bidirectional radio link to the remaining mobile sharing MT MT ..._n on, exchanged via this connection with the respective handset MT₂ .. MT_n from which shall include the information that the end of the connection request has occurred or the first handset MTi has accepted the incoming connection and builds subsequently each the radio link from. After evaluation of the information is the respective handset MT₂ ... MT_n in the state of SILENCE.

After ending the call between the external party and the first handset MTi the existing two-way radio link between the first handset MTi and the base station BS is degraded, whereupon the first handset MTi and the base station BS to return to the state CALM.

The flow chart shown in Figure 2 are also the states of a base station BS and its associated handsets MTi ... MT_n on which to simplify the conditions of the mobile sets MT₂ to MT_nHowever _ι not drawn are the sequence of states of the mobile handset MT_n correspond.

In the initial state, all three sitter ends titäten in state CALM. On an incoming call request to an external remote operator of the base station BS through a telecommunication network TKN to which the base station is connected is signaled, the base station BS enters the state RUF.

In contrast to the illustrated in Figure 1, in the method illustrated in Figure 2 method, the base station BS uses a in a DECT system normally to the respective assigned handsets MTi ... MT_n existing unidirectional radio link, in the functioning according to the DECT standard system, these are, for example, each by a dummy bearer or Trafic-Bearer, about all handsets MTi ... MT_n simultaneously the incoming call request is signaled, after which each of the handsets MTi ... MT_n merges into the state RUF and the respective user, for example, by ringing, signaling the incoming connection.

After termination of the signaling via the respective unidirectional radio link, the base station BS successively builds a respective one of the base station BS associated handsets MTi ... MT_n a bidirectional radio link, whereby the structure of the radio link takes place in a known manner, for example according to the DECT standard. About this radio link exchanges each handset MTi ... MT_n with the base station BS data Rufpattern, display messages, language setting, etc., of (communication), wherein the base station BS checked by evaluating the data, whether the previous signaling the incoming call request via the unidirectional radio link by the respective handset MTi ... MT_n has been received or not. Subsequently, the bidirectional radio link is released again and the same steps with a next of handsets MTi ... MT_n repeated until all n handsets MTi ... MT_n in the state GIVE have passed and this was Checks.

After a pre-set in the base station time, if no acceptance of the incoming call request by one of the handsets MTi ... MT_n has taken place, a renewal "Refreshing" the Signalsisierung the connection request to the handsets M i ... MT_n made.

These nutz the base station BS, the existing unidirectional radio link (dummy bearer, Trafic-Bearer) to all mobile sharing MTi ... MT_n In which via the respective unidirectional radio connection, the continued existence of the incoming call is signaled, so that the mobile parts MTi ... MT_n call signaling (ringing) continue.

In addition, the signaling of the continued existence of the incoming call request by establishing a two-way radio link to each one handset MTi ... MT_n, Exchange of data and subsequent dismantling of the bidirectional radio connection sequentially resume this proce- dure, are reviewed. Alternatively, however, continuing the renewal of only by building a two-way radio link to each one handset MTi ... MT_n, Exchange of data, the ten the continued existence of the incoming call request included, and subsequent dismantling of the bidirectional radio connection sequential Continue this procedure, signaled and are simultaneously checked.

If the incoming connection request accepted by a participant, for example by pressing a button, as shown in FIG 2 on the handset MTi, so the base station BS and the mobile part MTi enters the state TALK across and the base station indicates the remaining handsets MT₂ ... MT_n the end of the incoming call request, for which purpose a simultaneously each existing unidirectional radio link (dummy bearer, Trafic-bearer) to the remaining handsets MT₂ ... MT_n is being used.

The remaining handsets MTi ... MT_n Go then to the state CALM.

After ending the call between the external party and the first handset MTi is also directly reduced the bidirectional radio link, so that both the first handset MTi and the base station BS to go into the state CALM.

In the Figure 3 shows how the illustrated in Figure 2. A method upon the occurrence of the end of an incoming connection desire moves prior to accepting the incoming connection request.

That is a first signaling an incoming call request and a check is made in accordance with the stated in Figure 2 method. Alternatively, it can be done even after the declared in Figure 1 process.

After checking regularly at the same rate, in a known manner - stimulated by the base station - conducted a successful end in accordance with the process described in Figure 2 renewal of signaling of the incoming call request, so that the handsets MTi ... MT_n each able to continue the call signaling, wherein at each incoming signaling renewal of the respective handset MTi ... MT_n a timer starts, after a predetermined time, which is firmly implemented in the handset or can be set as parameters in which there is no further renewal of signaling, call signaling Handset MTi ... MT_n terminated so that it passes into the state of rest.

Alternatively, terminating the call signal can actively reach by means of a signaling by the base station BS instead, and this example simultaneously by utilizing the respective existing unidirectional radio link to all handsets MTi ... MT_n done or alternatively fertil by the build up of a bi-directional radio link with subsequent data exchange and degradation of the radio to a handset and sequential operation requires to all handsets MTi ... MT_n terminating the call has been signaled.

Alternatively, a signaling or message from one of the handsets MT_X ... MT_nWhich is in the state RUF, be addressed to the base station BS, for which purpose the handset MTi ... MT_n a radio link to the base station BS builds up, the message containing data to the base station BS transmits and the radio connection in the connection degrades it. This radio link can be unidirectional from the mobile station MTi ... MT_n be directed to the base station BDS, but alternatively be bi-directional.

Regardless of the variation of the radio link, there is a possibility that no radio channel is free, so that there is no radio link.

The handset MTi ... MT_n may drop in such a case, the message in principle, ie the attempt to construct a wireless connection is lost.

Alternatively, you can extend the explained in the figure 1 to 3 process to the effect that the handset MTi ... MT_n Depending on the content, ie possible contents are trying prioritized according to their content, withdraws from the study of the structure of a radio link or excited, for example by a timer de attempt to construct the radio link.