FI102234B - A digital mobile communication system and methods for handling an terminating call - Google Patents

A digital mobile communication system and methods for handling an terminating call Download PDF

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Publication number
FI102234B
FI102234B FI960211A FI960211A FI102234B FI 102234 B FI102234 B FI 102234B FI 960211 A FI960211 A FI 960211A FI 960211 A FI960211 A FI 960211A FI 102234 B FI102234 B FI 102234B
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Finland
Prior art keywords
mobile
network
control channels
packet radio
mobile terminal
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FI960211A
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Finnish (fi)
Swedish (sv)
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FI960211A0 (en
FI102234B1 (en
FI960211A (en
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Seppo Huotari
Hannu H Kari
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Nokia Telecommunications Oy
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Publication of FI960211A publication Critical patent/FI960211A/en
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W68/00User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/12Inter-network notification
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M2203/00Aspects of automatic or semi-automatic exchanges
    • H04M2203/15Aspects of automatic or semi-automatic exchanges related to dial plan and call routing
    • H04M2203/156On-line status dependent routing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W76/00Connection management
    • H04W76/20Manipulation of established connections
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/02Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/06Registration at serving network Location Register, VLR or user mobility server
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W92/00Interfaces specially adapted for wireless communication networks
    • H04W92/02Inter-networking arrangements

Description

1 102234

Digital mobile communication system and methods for handling terminating call

The invention relates to mobile communication systems to which a packet radio network is connected.

Mobile communication systems have been developed because there has been a need to free people to move away from fixed telephone terminals without making it difficult for them to reach them. While the use of various data transfer-10 services in offices has increased, various data services have also entered mobile communication systems. Laptops enable efficient data processing wherever the user moves. Mobile networks, in turn, provide the user 15 with an efficient access network for mobile data transmission, which provides access to the actual data networks. To this end, various new forms of data services are being planned for existing and future mobile networks. Digital data communication systems, such as the pan-European travel communication system GSM (Global System for Mobile Communication), support mobile data transmission particularly well.

The General Packet Radio Service (GPRS) is a new service for the GSM system and is one of the topics in the GSM Phase 2+ standardization work at ETSI (European Telecommunication Standard Institute). The GPRS operating environment consists of one or more sub-• «· * · * * network service areas, which are interconnected by a GPRS: Y: backbone network. The subnet comprises: ***; 30 sets of packet data service nodes and SNs, referred to herein as * * * serving GPRS support nodes SGSNs, each connected to a GSM mobile network (typically base station systems) so as to be able to provide packet data service to mobile base stations of multiple data terminals. cellular 2 102234 ta. The intermediate mobile network provides packet-switched data transmission between the support node and the mobile data terminal equipment. The various subnetworks, in turn, are connected to an external data network, e.g. a public switched data network PSPDN, via special GPRS access channel support nodes GGSN. Thus, the GPRS service provides packet data transmission between mobile data terminals and external data networks, with the GSM network acting as the access network. One feature of the GPRS service network is that it operates almost independently of the GSM network in parallel with the "normal" services of the GSM network.

Such a GPRS GSM network may have mobile stations MS (class B and C mobile stations) which can operate both normally in the GSM network and in the GPRS network. 15 In this application, the state in which a mobile station operates in a GPRS network (transmits data over a packet-switched connection, so-called Active state in GPRS terms) is called GPRS Mode, and the state in which a mobile station operates in a GSM network is called GSM mode data or voice over a circuit-20 connected connection, so-called Idle mode in GPRS terms). MS

switches from GSM mode (Idle) to GPRS mode (Active) by starting the GPRS Logon procedure and exits GPRS mode (Active) to GSM mode (Idle) by starting GPRS Logoff -; the procedure. When the MS is in GPRS (Active) mode, it can either actively send and receive messages or, ·, ·. be idle". Since the MS is idle for most of the time in GPRS mode, it can listen to normal GSM paging channels and respond to, for example, calls terminated on a mobile station (MT). During packet data transmission, it may not be possible to listen to 30 GSM channels.

• · ·

Thus, MS may not be achieved. Since the data transfer activity is not exactly known in GPRS mode, it is also not known exactly whether the MS hears GSM calls or not. If the MS does not receive the paging message, the GSM network may infer the validity of the 35 fault situations, because according to the subscriber data of the GSM network, the MS should be reachable. The situation is not remedied until the MS returns to GSM (Idle) mode. This "vague" reachability is a problem for both the mobile subscriber as well as the GSM network and the calling subscriber 5. A similar problem can arise in other packet radio networks built on top of a conventional mobile network.

It is an object of the present invention to overcome this problem.

The invention relates to a digital mobile communication system comprising a mobile communication network comprising a mobile switching center, base station systems, a subscriber database for maintaining subscriber information and location information of mobile network subscribers, a packet radio network comprising packet radio access nodes and each mobile network connected to each other. a plurality of other packet radio support nodes, and at least one gateway support node providing a data network or another packet radio system outside the access point, first control channels reserved for use by the mobile network in the base station systems, second control channels reserved for the network is the first • · · operating mode in which it monitors said first • · · *. control channels, and a second mode of operation in which it • ·: .v monitors said other control channels. According to the invention 30, the state and database of the mobile communication network contain information that the mobile communication terminal equipment is not reachable via the first control channels when the mobile communication terminal equipment is in said second operating mode.

The invention also relates to methods for handling a call terminating at a mobile station in a digital mobile communication system comprising a mobile communication network; a packet radio network including packet radio support nodes, each of which is connected to a mobile station-5 network forming a radio interface of the packet radio network; the first control channels reserved for the use of the mobile communication network at the radio interface; second control channels reserved for the use of the packet radio network at the radio interface; and a mobile terminal having a first mode of operation in which it monitors said first control channels and a second mode of operation in which it monitors said second control channels.

In the first method: 15 updating the information in the mobile network subscriber database that the mobile terminal equipment is not reachable via the first control channels when the mobile terminal equipment enters the second operating mode; a call terminating in the mobile network for the mobile terminal equipment, • · · making a query to said subscriber database, • «* interrupting call set-up or making a call transfer, if there is information in said subscriber database, •« · ϊ ...: 30 that the mobile terminal equipment is not accessible through the first control channels.

• ·

In the second method: 4 · updating the subscriber database of the mobile network with the information that the mobile terminal is in the packet radio network and is not reachable via the first control channels when the mobile terminal switches from the first to the second operating mode; , in response to the subscriber database information that the mobile terminal equipment is not reachable via the first control channels and is registered in the packet radio network, the mobile terminal equipment

In the third method, the subscriber database of the mobile network is maintained with the information that the mobile terminal is capable or authorized to operate in the second operating mode, a call terminating in the mobile network terminating the mobile terminal is queried notification via the diode that an incoming call is received in the mobile network, the mobile terminal switches to monitor the first control channels in response to receiving the notification, call set-up is continued in the mobile network via the first control channels.

The basic idea of the present invention is to provide the actual mobile communication network with the information that the mobile station is not completely certain to be reached for regular calls when it is in the packet radio mode. With this information, the mobile network is able to give an appropriate response (e.g., the mobile station is busy or out of coverage) to the calling state-5 and performs, for example, call forwarding in MT calls.

In one embodiment of the invention, the mobile station itself, when entering the packet radio mode, signals to the mobile network that it is not available for traditional mobile services. The mobile network stores this reachability information in the subscriber information in the normal way. When leaving the packet radio mode, the mobile station signals to the mobile network that it is reachable again. This is preferably done by the peer-to-peer signaling available for this purpose in the mobile network, such as IMSI Detach and IMSI Attach messages in the GSM system.

In another embodiment of the invention, the mobile network derives the status information of the mobile station from the fact that the mobile station logs in to the packet mode in the packet radio subscriber register. In this case, the mobile station does not need to signal the data separately. In addition, the subscriber information may also have a reason for not being reachable, i.e. packet radio mode.

25 These embodiments of the invention solve the travel. due to the "ambiguity" of the reachability of the communication device, the mobile communication network now unambiguously knows that the mobile communication station is not reachable for normal services. However, part of the reachability problem remains, even more acute: If the user keeps the mobile station in packet radio mode for a long time, he will not be able to receive MT calls even if he has not sent any data packets at all.

This problem can be alleviated in yet another embodiment of the invention. There is information in the mobile network, 7 102234, that the mobile station is in packet radio mode and thus out of reach of normal calls. When the location of the mobile subscriber is queried in the MT call set-up from a subscriber database, e.g. the home location register HLR in the GSM network, the subscriber database detects that the mobile station is in packet radio mode. In this case, the subscriber database initiates a notification procedure in the packet radio network, in which the serving packet radio support node sends a message to the mobile station on the packet radio channel notifying 10 MT calls in the mobile network. This allows the mobile station to know about the incoming MT call and can switch to listen to the paging channels of the mobile network. The mobile station or user may be able to choose whether or not to receive an MT call.

The invention will now be described by way of preferred embodiments with reference to the accompanying drawing, in which Figure 1 shows a GPRS network according to the invention, Figures 2, 3 and 4 are signaling diagrams illustrating 20 different ways of updating mobile presence / absence information in HLR and processing MT voice calls. .., 'lu.

The present invention is applicable to the management of mobile terminating (MT) calls in 25 different types of packet radio systems in which a mobile station may be in both mobile mode and packet radio mode in which it does not listen to paging channels of the mobile system or listens to them only randomly. · • «<V. sesti. Particularly preferably, the invention is suitable for use in the implementation of a General Packet Radio Service (GPRS) in a pan-European digital mobile communication system GSM (Global System for Mobile Communication) or equivalent mobile communication systems such as DCS1800 and 35 PCN (Personal Communication). Network). In the following, preferred embodiments of the invention will be described by means of a GPRS packet radio network formed jointly by a GPRS service and a GSM system, without limiting the invention to such a particular packet radio system.

Figure 1 illustrates a GPRS packet radio network implemented in a GSM system.

The basic structure of the GSM network consists of two parts: the base station system BSS and the network subsystem 10 (NSS). The BSS and the mobile stations MS communicate via radio links. In the base station system BSS, each cell is served by the base station BTS. A number of base stations are connected to a base station controller BSC, the function of which is to control the radio frequencies and channels used by the BTS. The BSCt is connected to the mobile switching center MSC. Certain MSCs are connected to other telecommunication networks, such as the public switched telephone network (PSTN), and include gateway functions for outgoing and incoming calls to these networks. These MSCs are known as gateway MSCs (GMSCs).

20 There are two main types of databases related to call routing. The home location register HLR stores fixed or semi-fixed subscriber data of all network subscribers, including information about the services to which the subscriber may have access and the current location of the subscriber. Another type of register is the visitor register VLR. A VLR is usually associated with • · one MSC, but can still serve multiple MSCs. It is common practice for the VLR to be integrated with the «· · *« '· MSC. This integrated network element is known as a Visitor MSC (VMSC). Whenever the mobile station MS is active. vine (registered and able to make or receive calls), most of the mobile subscriber information about the mobile station MS stored in the HLR is copied to the VLR of the MSC in whose area the MS 35 is located. However, for a more detailed description of the GSM system 9 102234, reference is made to the ETSI / GSM Recommendations and the book "The GSM System for Mobile Communications", M. Mouly and M. Pautet, Palaiseau, France, 1992, ISBN: 2-9507190-07-7.

5 In Figure 1, a GPRS network connected to a GSM network comprises two serving GPRS support nodes (SGSN) and one GPRS gateway support node (GGSN). These different support nodes SGSN and GGSN are connected to each other by an intra-operator backbone Net-10 work. It is to be understood that a GPRS network may have any number of support and gateway nodes. In addition, it may have a so-called home support nodes HGSN, although as a rule the functions of the HGSN are connected to the GGSN.

Each support node SGSN manages the packet data service in the area of one or more cells in a cellular packet radio network. To this end, each support node SGSN is connected to a specific local part of the GSM mobile communication system. This connection is typically made to a mobile switching center, but in some situations it may be advantageous to make the connection directly to the base station system BSS, i.e. to the base station controllers BSC or to one of the base stations BTS. The mobile station MS in the cell communicates over the radio interface with the base station BTS and further through the mobile network with the support node SGSN 25 to whose service area the cell belongs. In principle, the mobile network ♦ ·. *: V between the support node SGSN and the mobile station MS only forwards packets between the two «. To this end, the mobile network can provide either a circuit-switched connection or packet-switched data transmission between the mobile station MS and the SGSN of the serving support node. Example of a circuit-switched connection between the mobile station MS and the support node (Agent) is shown in patent application FI 934115. An example of packet-switched data transmission between a mobile station MS 35 and a support node (Agent) is presented in patent application FI 940314. However, it should be noted that the mobile network only provides a physical connection between the mobile station MS and the support node SGSN not relevant to the invention.

The operator's internal backbone network 10, which connects the operator's devices SGSN and GGSN, may be implemented, for example, in a local area network. It should be noted that it is also possible to implement the GPRS network of the operator 10 without the operator's internal backbone network, for example by implementing all features in one computer, but this change does not cause any changes to the principles of call set-up according to the invention.

The GPRS gateway support node GGSN connects the GPRS network of the operator-15 to the GPRS systems of other operators as well as to data networks, such as the Inter-Operator Backbone Network 12, the IP network or the X.25 network 11. The GGN of the gateway port and between other networks there may be a network 20 adapter IWF. The inter-operator backbone network 12 is a network through which the gateway support nodes GGSNs of different operators can communicate with each other. This communication is needed to support GPRS roaming between different GPRS networks.

·. ·; The gateway support node GGSN is also used to store location information of GPRS mobile stations. The GGSN also routes terminating (MT) data packets to the mobile station. The GGSN also includes a database that maps together the network address of a mobile station, e.g., an IP network, an X.25 network, a CLNP network, or simultaneously several of these, and a mobile station. ID in the GPRS network. When a mobile station moves from one cell to another within the SGSN area of one support node, the location update only needs to be performed at the support node SGSN and there is no need to notify the GGSSN of the location change. When the mobile station moves from one SGSN cell of one support node to another SGSN cell in the same or a different perforator area, an update is also performed to the (home) gateway support node GGSN to store the new visitor support node identifier and the mobile station identifier.

The GPRS register GR is used to authenticate subscribers at the beginning of a GPRS session. It includes a mapping between the subscriber's packet data protocol (PDP) address (es) and the subscriber's IMSI (International Mobile Subscriber 10 Identity). In the GSM network, the subscriber is identified by the IMSI. The GR may be a separate register or may preferably be integrated with the home location register HLR of the mobile communication system. In the figure, the HLR / GR is connected via SS7 (Signaling System 7) 15 mm signaling system. To the MSC and the operator's internal backbone network.

There may be a direct interface or an SS7 gateway node GATEWAY between the SS7 signaling system and the operator's internal backbone network. In this way, the HLR / GR can in principle exchange packet-switched messages with any GPRS-20 node. HLR / GR communication method and interface,. However, with the GPRS network there is no such thing as the invention; · essential. Alternatively, there may be, for example, a direct connection from here to a node, or GR is one of the nodes in the GPRS network.

: 25 When the MS enters GPRS mode (where data can be transferred over a packet-switched connection), it initiates the GPRS Logon procedure. In the procedure, the MS requests access to the GPRS network and sends its identification IMSI to the serving support node SGSN. Based on the IMSI, the serving SGSN makes • t 30 queries to the HRL. The HLR initiates GSM-type challen • · '··· ”ge-response authentication in the packet radio network. This * · *: includes the generation and transmission of an authentication triplet to a 4 «.... j GPRS network. After authentication, the MS registers as a user of a particular data network (such as 11) and its address. This registration is done with GR.

12 102234 GPRS The GSM network may have mobile stations MS (class B or C mobile stations), which may be in either GPRS mode or GSM mode (transmitting data or voice over a circuit-switched connection). The MS switches from GSM mode 5 to GPRS mode by starting the GPRS Logon procedure and from GPRS mode to GSM mode by starting the GPRS Logoff procedure. Because the MS is idle for most of the time in GPRS mode, it could still listen to normal GSM calls (e.g. to make a voice call to a mobile station (MT)), but there is no guarantee that the MS will receive paging messages. If the MS does not receive the paging message, the GSM network may infer the validity of the fault situation, because according to the subscriber data of the GSM network, the MS should be reachable. The situation is not remedied until the MS returns to GSM mode.

In the present invention, information is generated in the home location register HLR of the GSM network that the mobile station is not reachable for conventional calls when entering the packet radio mode. With this information, the mobile network is able to give an appropriate response 20 (e.g., the mobile station is busy or out of coverage) to the calling subscriber and performs, for example, call forwarding in MT calls or interrupts call set-up. The signaling diagrams of Figures 2 and 3 show an example of '' two alternative ways to update a mobile station; 25 men presence / absence information to the HLR and handle the MT call.

In the embodiment shown in Figure 2, the MS itself is arranged, before switching to packet radio mode, to signal to the GSM network that it is not reachable for conventional mobile service. This • ·

* · ”'Takes place, for example, with IMSI in accordance with the GSM recommendations

With a detach message, which is normally used to indicate that the MS has left the network (e.g. as a result of the closure of a mobile station). This message does not normally contain information about the reason for the absence, but may be provided with this information if desired. The MS signals the IMSI Detach message on the GSM channel via the base station system BSS to the mobile services switching center MSC, which forwards the IMSI Detach information to the HLR. The HLR updates the subscriber information that the mobile subscriber (MS) is not reachable (MS Detached).

The MS then performs registration on the GPRS channel to the GPRS network using the GPRS Logon procedure. Thus, the MS has switched from the GSM mode to the GPRS mode, where it listens primarily or exclusively to GPRS channels.

An MS call arrives at the MSC, for example from the public switched telephone network PSTN. The MSC performs a normal routing information query to the HLR (HLR query). The HLR detects from the subscriber information that the MS is not reachable and signals this information in response to the MSC. The MSC gives a suitable message to the calling subscriber and terminates the call set-up or performs call transfer, for example. Information about the activated call transfer and the call transfer number are obtained in the response of the HLR.

At some point, the MS terminates the registration to the GPRS network by performing the GPRS Logoff procedure on the GPRS channel. When returning to the GSM mode, the MS again signals to the GSM network that it is reachable again. This is done, for example, with a *. * '25 IMSI Attach message in accordance with the GSM recommendation. The MS sends an IMSI Attach message

On the GSM channel via the base station system BSS to the MSC,!,!,! which forwards the IMSI Attach information to the HLR. HLR

: T: Updates to the subscriber information that the mobile subscriber (MS) is available (MS Attached). Incoming MT calls after this «« · M 30 are handled according to the normal call set-up of the GSM system * ·; · *.

According to another approach of the invention, the outage information is provided to the HLR in another way that does not require the MS to separately signal the information on GSM channels. 35 Instead, the HLR receives data via the GPRS network. There are 14 102234 several alternative ways to do this, some of which are outlined below.

1) The MS itself signals the data directly to the HRL in the data packet (GPRS IMSI Attach, GPRS IMSI Detach).

2) The MS signals the information to the SGSN (e.g. GPRS Logon, GPRS Logoff), which further communicates it to the HLR.

3) The MS signals the information to the SGSN (e.g. GPRS Logon, GPRS Logoff), which forwards it to the GR and this in turn to the HLR.

4) The MS signals the information to the SGSN (e.g. GPRS Logon, GPRS Logoff), which forwards it to the GR. The HLR interrogates its GR in the case of an MT call with subscribers capable of GPRS mode.

5) The SGSN detects that the MS has left the GPRS state 15 (e.g. because it does not acknowledge the transmitted data packets). Such a situation can arise, for example, when the battery of the MS runs out before it has time to signal its departure. The SGSN signals the information to the HLR or GR as in steps 2-4.

As an alternative to the above, any other way in which the HLR receives information from the GPRS network about the registration of the MS in or out can be used.

The signaling diagram of Figure 3 further illustrates one way to provide MS presence / absence information to its HLR with GPRS Logon and Logoff procedures, and MT call handling. When switching from GSM mode to GPRS, the MS registers in the GPRS network with the GPRS Logon procedure. This also involves an authentication procedure in which the HLR (and / or GR) is also involved. From this authentication procedure, the HLR can conclude that the MS has switched to GPRS mode and is no longer available to normal GSM services. As a result, the HLR updates to the subscriber information that the mobile subscriber (MS) is not reachable (MS Detached) and possibly also 35 reasons (GPRS Logon). If an MS 10102234 MT call is then received from the PSTN to the MS, the MSC makes an HLR query and receives a "MS unreachable" response as in the case of Figure 2. At some point, the MS registers out of the GPRS network with a Logoff procedure, in which the SGSN and the GGSN are signaled that they can destroy their data related to the MS. At the same time, the SGSN informs either the HRL directly or the GR, which in turn informs the HLR. The HLR updates to the subscriber information that the mobile subscriber (MS) is reachable again (MS Attached).

Fig. 4 is a signaling diagram illustrating a third embodiment of the invention, in which the MS is informed via the GPRS network that it is receiving an MT call in the GSM network. In Figure 4, the MS initially registers with the GPRS network using the GPRS Logon procedure, whereby the HLR is updated with the information that the MS is not reachable via normal GSM paging channels because it is in GPRS mode. This procedure is similar to that described above in connection with Figure 3. Alternatively, however, any method can be used to update the information that the MS is in the GPRS network to the HLR. The MSC receives an MT call from the PSTN to that MS. The MSC performs a normal routing information query to the HLR. The HLR detects from the subscriber data that the MS has registered in the GPRS network. As a result of this information, the HLR notifies the MS via the GPRS network that the MS is receiving a call via GSM channels. This announcement can be • communicated in a number of ways, some of which are explained in more detail below.

<

. · '·. According to a third approach of the invention, the HLR

The M 30 sends a notification to the MS via the GPRS network that it is receiving an MT call on GSM channels. This can be done * * when the HLR has or receives information from the GPRS network that the MS is in the GPRS network. The HLR can also send information about the MT call 35 via the GPRS network whenever the MS is entitled to GPRS services, regardless of whether the MS is in the GPRS network or not. In this case, the HLR does not need presence / absence information, but is normally only in the GPRS network. If the MS is not in the GPRS network, the GPRS network cannot forward the notification 5 but is "lost". If the MS is in a GPRS network, the network forwards the notification. In both cases, the GSM network has continued to establish calls on GSM channels.

In the embodiment of Figure 4, it is assumed that the HLR also includes the address of the support node serving from the 10 MS. In this case, the HLR, which has a connection to the GPRS support nodes (e.g. via the SS7 system), can send a data packet to the serving support node indicating the incoming call. Alternatively, the HLR may send to the gateway support node a data packet having an MS data network-15 address or some general address based on which the GGSN may route the data packet to the serving support node SGSN. In this case, this address must be stored in the HLR, or the HLR must be able to retrieve it with a GR query. A further alternative is for the HLR to inform the GR 20 of an incoming call to a particular IMSI, whereby the GR generates and sends a data packet with a data network address of the MS (containing the notification according to the invention) to the serving support node SGSN either directly or via the gateway support node GGSN.

When information about an incoming GSM call has been transmitted (in a suitable manner) to the serving support node SGSN, it sends a data packet on the packet radio channel to the mobile station indicating the MT call X. on GSM channels. In this way, the MS knows about the upcoming MT- «'♦ J.I 30 call and can switch to listen to GSM paging channels. • · * 1 * The transition can be absolute or to a mobile station or • · ·? *? the user can be given the option to receive or not receive an MT call. For example, the MS may remain in GPRS mode if it has an active data-35 transmission phase in progress that is not desired to be interrupted.

π 102234

If the MS switches to GSM mode, the SGSN of the support node must also be aware of this in order to be able to interrupt the transmission via GPRS channels. In the simplest case, the serving SGSN automatically interrupts the transmission of information 5 on the GPRS channel after sending a notification of an incoming call according to the invention.

Another option is for the serving SGSN to resume its transmission and interrupt only after noticing that the MS is not responding.

Another alternative is that the MS, when temporarily leaving the GPRS mode, signals to the support node SGSN via the GPRS channel that no data packets may be sent to it because it is busy elsewhere. The serving SGSN (or other entity in the GPRS network) may buffer or discard the received data in the meantime. In the latter case, no data is permanently lost because the end-to-end connection protocols of the upper layer take care of retransmitting the data packets if they are not acknowledged by the MS.

20 After sending the notification via the GPRS network HLR

sends a normal query response to the MSC containing the roaming number of the mobile station. Thereafter, the establishment of a call to the MS, which has switched to listening to GSM paging channels, proceeds according to conventional GSM signaling on GSM channels.

The figures and the related description are intended only to illustrate the present invention. In one detail, the invention may vary within the scope and spirit of the appended claims.

•> <· • # · • »• · ··· · · · ·

Claims (16)

  1. A digital mobile communication system comprising 5 mobile communication networks including a mobile switching center (MSC), base station systems (BSC, BTS), a subscriber database (HLR) for maintaining subscriber information and location information of mobile network subscribers, a packet radio network comprising a packet radio path 10 SGSN), each connected to a mobile network and one or more other packet radio nodes, and at least one gateway support node (GGSN) providing an access point outside the data network or another packet radio system, 15 first control channels reserved for access to the travel network, is reserved for the use of a packet radio network in base station systems, a mobile terminal (MS) having a first mode of operation in which it monitors said first control channels and a second mode of operation in which it monitors said main control channels. other control channels, characterized in that: the mobile network subscriber database (HLR) contains:. . 25 information that the target of the mobile terminal (MS) • • ·; * · *; through the first control channels is uncertain when the mobile terminal (MS) is in said second operating mode. • · »lii
  2. A mobile communication system according to claim 1, characterized in that the mobile terminal (MS) is arranged to signal on said first control channels the presence or presence information of the mobile network when it is transmitted. from the first operating mode to the second operating mode or from the second operating mode to the first operating mode, respectively, 102234 19 the mobile network is arranged to update the absence or presence information signaled by the mobile terminal (MS) to the subscriber database (HLR).
  3. Mobile communication system according to claim 1 or 2, characterized in that the subscriber database is arranged to receive or query the presence / absence information of the mobile communication terminal (MS) from the packet radio network.
  4. A mobile communication system according to claim 3, characterized in that the packet radio network comprises a first registration procedure performed by the mobile terminal (MS) via the first control channels when entering the second operating mode and a second registration procedure performed by the mobile terminal when operating from the second control channels. , the mobile network subscriber database (HLR), in response to performing the first registration procedure in the packet radio network 20, updates the subscriber information that iiif; the mobile terminal (MS) is not reachable. . via the first control channels, the mobile network subscriber database (HLR), in response to performing the second registration procedure in the packet radio network, updates the subscriber information that the mobile communication terminal MS is accessible via the first control channels. :: t
  5. A mobile communication system according to claim 1, 2, 3 or 4, characterized in that to said information that the mobile terminal is not accessible via the first control channels. , is associated with information that the mobile terminal equipment is registered in a packet radio network.
  6. A mobile communication system 35 according to claim 1, 2, 3, 4 or 5, characterized in that the mobile switching center (MSC) to which the call terminating the mobile terminal arrives performs a query to the subscriber database (HLR), the mobile switching center (MSC) ) is arranged to interrupt call set-up or perform call transfer when the subscriber database (HLR) has information that the mobile terminal (MS) is not reachable via the first control channels.
  7. Mobile communication system according to one of Claims 1 to 5, characterized in that the mobile switching center (MSC) to which the call terminating at the mobile terminal arrives queries the subscriber database (HLR), the subscriber database, in response to the information that the mobile terminal (MS) is not reachable. via the first control channels and is registered in the packet radio network, is arranged to transmit to the mobile terminal (MS) via the packet radio network a notification that a call is coming to it in the mobile network, the mobile network continues to establish the call en-. : Via the first 20 control channels.
  8. The mobile communication system of claim 1. . system, characterized in that said information comprises information that the mobile terminal equipment is entitled or capable of operating in a packet radio network.
  9. • · · *. * * 9. A mobile communication system according to claim 8, characterized in that? a mobile switching center (MSC) to which the mobile station arrives; a call to the terminal equipment, performs a query to the subscriber database (HLR) 30, • · · • · · *. * subscriber database, in response to the knowledge that the mobile terminal equipment (MS) is entitled or capable of: ': operating in a packet radio network, is arranged to transmit to the mobile terminal (MS) via the packet radio network 35 a notification that a call is coming to it in the mobile network, 21 102234 the mobile network continues to establish a call via the first control channels.
  10. Mobile communication system according to claim 7 or 9, characterized in that the mobile communication terminal (MS), in response to receiving said notification via the packet radio network, switches to listening to the first control channels.
  11. Mobile communication system according to claim 10, characterized in that the packet radio network 10 interrupts the transmission of information to the mobile terminal (MS) in one of the following ways: in response to sending said notification to the mobile terminal 15. in response to the transmission terminal information.
  12. 12. A method for handling a call terminating at a mobile station: 20 in a digital mobile communication system comprising a mobile communication network; packet radio network,; comprising packet radio support nodes, each connected to a mobile network forming a radio interface of the packet radio network; first control channels reserved for use by the mobile network at the radio interface; • · · * · *; second control channels reserved for the packet radio network; as well as a mobile terminal • I V. · an apparatus having a first operating mode in which it: V. monitors said first control channels and a second> /. i 30 operating mode in which it monitors said second control channels; that the availability of the mobile terminal equipment via the first control channels is uncertain when the mobile terminal equipment switches from the first to the second operating mode, 102234 22 updating the information of the mobile network equipment subscriber database, 102234 22 updating the information of the mobile terminal equipment from the first to the second operating mode, This mobile terminal is accessible via the first control channels when the mobile terminal returns from the second to the first operating mode, a call terminating in the mobile network is terminated, a query is made to said subscriber database, call set-up is interrupted or a call transfer is performed if
  13. A method for handling a call terminating at a mobile station in a digital mobile communication system comprising a mobile communication network; a packet radio network including packet radio support nodes, each connected to a mobile network forming a radio interface of a packet radio network; first control channels reserved for use of the mobile communication network at the radio interface; second control channels reserved for the use of the packet radio network at the radio interface; and a mobile terminal having a first mode of operation in which it monitors said first control channels,. and a second mode of operation in which it monitors said activities, ·,; control channels, characterized in that the subscriber database of the mobile network is updated with the information that the mobile terminal equipment is in the packet-25 diode network and that its reachability through the first control channels is uncertain when the mobile terminal equipment switches from the first to the second operating mode, • «V .: received in the mobile network mobile «« ·. a call to the terminal, 30 a query is made to said subscriber database, • · · forwarded, in response to said subscriber database (HLR) information, to the mobile terminal via the packet radio network, a notification that it is receiving a call in the mobile network, 35 mobile terminals in response to receiving the notification, call set-up is continued in the mobile network via the first control channels.
  14. A method for handling a call 5 terminating at a mobile station in a digital mobile communication system comprising a mobile communication network; a packet radio network including packet radio support nodes, each of which is connected to a mobile network that forms a radio interface of the packet radio network; first control channels dedicated to the use of the mobile network at the radio interface; second control channels reserved for the use of the packet radio network at the radio interface; as well as mobile terminal hardware. having a first mode of operation in which it monitors said first control channels and a second mode of operation in which it monitors said second control channels. characterized by updating in the subscriber database of the mobile network the information that the mobile terminal is capable or entitled to operate in another mode of operation,: "; 20 receiving a call terminating in the mobile network 25 via the radio network, a notification that a call is coming to it in the mobile network, the mobile terminal switches to monitor «4 ·. *, The first control channels in response to the receipt of the notification, through.
  15. A method according to claim 13, 14 or 15. characterized in that absence or presence information is signaled from the mobile terminal to the mobile network on said first control channels when the mobile terminal switches from the first operating mode to the second operating mode or from the second operating mode to the first operating mode, respectively, is updated.
  16. A method according to claim 13, 14 or 15, characterized in that a first registration procedure to the packet radio network is performed via the second control channels when the mobile terminal enters the second operating mode, a second registration procedure is performed in the packet radio network via the second control channels when the mobile terminal exits the second operating mode or is updated. - information to the subscriber database (HLR) of the mobile network in response to performing the first or second registration procedure in the packet radio network, respectively. 20 • · · • · · • · • • (* · «·« • ♦ 30 «t 1 • ·« «· 35 · · • · • · · · 102234 25
FI960211A 1996-01-16 1996-01-16 A digital mobile communication system and methods for handling an terminating call FI102234B (en)

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AU14459/97A AU1445997A (en) 1996-01-16 1997-01-15 Digital mobile communication system and methods for processing a terminating call
PCT/FI1997/000020 WO1997026764A1 (en) 1996-01-16 1997-01-15 Digital mobile communication system and methods for processing a terminating call

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AU1445997A (en) 1997-08-11
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FI960211A0 (en) 1996-01-16
FI960211D0 (en)
FI960211A (en) 1997-07-17

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