MXPA00007564A - System and method for mobile data services - Google Patents

Abstract

An improved system and method for wireless data transmission across a variety of telecommunications services operating under a variety of standards is disclosed. The system and method operate by separating the call SCCMS and connection control WCCMS in mobile access, providing a generic call control mechanism offering uniformity in communications and allowing a separate connection control mechanism to handle the physical and virtual channel connections.

Description

"SYSTEM AND METHOD FOR MOBILE DATA SERVICES" BACKGROUND OF THE PRESENT INVENTION _. FIELD OF THE INVENTION 27 _ X The present invention relates generally to a system and method for communication between a mobile station and a wired network, particularly with an improved system and method for transmitting data packets between a wireless subscriber and a wired network and, more particularly, with an improved system and method for data transmission between different or unequal telecommunication services, using a common protocol.

BACKGROUND AND OBJECTS OF THE PRESENT INVENTION The evolution of wireless communication through the last century, from the demonstration of the radio capacity of Guglielmo Marconi in 1897 to provide continuous contact with ships that sailed on the English Channel, has been remarkable. Since the Marconi's discovery, new methods of wired and wireless communication services and standards have been adopted by people throughout the world. This evolution - - has accelerated, particularly over the last ten years, during which the mobile radio communications industry has grown by orders of magnitude supplied by numerous technological advances that have made the smallest portable radio equipment, more economical and more reliable. The exponential growth of mobile telephony will also continue to increase in the coming decades, since this wireless network interacts with and eventually reaches the existing wired networks. Conventional wireline systems, commonly referred to as the Public Switched Telephone Circuit (PSTN), as well as initial wireless systems, such as Advanced Mobile Phone Services (AMPS) used in the United States, provide a path of fixed communications between the message source and the destination. This fixed circuit switching technique establishes a dedicated connection or allocation of system resources, i.e., a radio channel between a base station and the mobile terminal, and a dedicated telephone line between the associated mobile switching center and the PSTN through still call duration. Even when these dedicated connections are useful for maintaining voice communications, which usually involve the transfer of a Two-data continuous current that lasts over a relatively long period of time. Circuit switching is not very efficient for data communications, particularly wireless data communications because short, explosive transmissions are often followed by periods of time. prolonged inactivity, resulting in a waste of resources. With the proliferation of computers, facsimiles, electronic mail (e-mail), sending of short messages and other services, the transmission of data, particularly, package form, is becoming more prevalent. In an effort to provide an efficient network set for wired data transmission, the Integrated Services Digital Network (ISDN) was developed to complement the PSTN and provide enhanced data services between network nodes and end users. In the area of wireless technology, the cellular industry of the United States in 1993 developed the Digital Cellular Package Data (CDPD) standard that coexists with conventional voice-only cellular systems, such as AMPS, CDPD that surpasses cellular infrastructure existing and uses unused air time in vacant cellular voice channels, to transmit the data packets in them.

- Even when CDPD and similar systems such as the General Packet Radio System (GPRS) for the European Global System for Mobile Communication (GSM), it tries to bring the scarce radio and access network transport resources to the optimum, it should be understood that these systems operate independently and include their own functions and protocols for the installation and release of missing packet data connections, functions and protocols in the underlying system. In view of the aforementioned discussion, it is evident that there are a number of unequal or different data communication systems and protocols in current use, and proposed to be used, each of them administering services with different characteristics, eg voice, data switched by circuit, packet data, and so on. What is needed is a uniform mechanism to handle different types of information, particularly in the wireless arena. One of these mechanisms in the wired area that has significantly increased the bandwidth of ISDN communications in ISDN Broadband (B-ISDN), which is based on the technology of Asynchronous Transfer Mode (ATM) that allows the regimes of packet switching up to several Gbps. ATM is a packet switching and multiplexing technique, ~~ designed - especially to handle both voice users and users of packet data on a single physical channel. ATM supports the bi-directional transfer of fixed-length data packets between two endpoints, while preserving the transmission order. More importantly, through the use of B-ISDN call controls and ATM technology, different or unequal services that have different characteristics are handled in a uniform manner. As an example of the service characteristics of the B-ISDN bearer, each bearer is characterized by a set of parameters, such as the bandwidth, the delay, the delay variation, the cell loss ratio, and so on, all which can be found in ITU-T Recommendation Q.2931. Correspondingly, an object of the present invention is to provide an improved system and method for the uniform handling of unequal services having different characteristics in a wireless environment.

COMPENDIUM OF THE INVENTION The present invention is directed to an improved system and method for wireless data transmission through a variety of telecommunications services. - - that work under a variety of standards. The system and method work by separating the control- of the traditional call in the service specific call control and the specific call control of xadio in a mobile access, providing a generic call control mechanism that offers uniformity in communications and that allows a separate connection control mechanism to handle physical and virtual channel connections. A more complete appreciation of the present invention, and the scope thereof, of the accompanying drawings which are briefly summarized below, may be obtained from the following description - detailed embodiments of the presently preferred embodiments and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram of the configuration of the system component and method of the present invention, illustrating the control plane entities for the separation of traditional call control in the service-specific call control and the specific call control of radio; Y - Figure 2 is a schematic diagram of the user plane carrier connectors between the components of Figure 1.

DETAILED DESCRIPTION OF THE EXEMPLARY MODALITIES PREFERRED IN THE PRESENT DAY __ ~ The present invention will now be described more fully below with reference to the accompanying drawings, in which the preferred embodiments of the invention are shown. This invention, however, may be encompassed in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure is complete and complete, and fully transmits the scope of the invention to those skilled in the art. Referring now to Figure 1, a block diagram illustrating the components and configuration of a system in accordance with the present invention is shown. As illustrated, a mobile station (MS) 10 is in radio communication with a local Mobile Services Switching Center (MSC) 12. It should be understood that the MS 10 can communicate with the MSC 12 through a base station (not shown), as will be understood by those skilled in the art.

The MSC 12, in turn, connects with other networks through appropriate interfaces. If this network is an ATM-based B-ISDN 14 network, the interface preferably fills the NNI (Network Nodule Interface) specifications of B-ISDNs specifby the standardized organizations. This ATM-based B-ISDN network has a number of ATM end stations connected to it. These ATM end stations for example, can be accesses to other networks, and are referred to herein generally as Service Nodes 16. For example, the Service Node 16 in Figure 1 can act as a gateway between a Protocol Network of Transmission Control / Internet Protocol (TCP / IP) (not shown) and ATM network 14. Referring now to MS 10 in Figure 1, the functionality within MS 10 is divided into at least two control entities separated and distant. The first, a Service Call Control entity in a mobile telephone designated here by the reference identifier (SCCM.S) implements a normal call control functionality, such as is found in the B-ISDN terminals. The second, a specific Wireless Network Call Control on a mobile phone / implements the required radio access call control functionality, e.g., service negotiation, etc., and it depends on the technology of the radio access. In other words, the call control of the MS 10 is divided into a high level command entity (SCCM_S) using normal call control protocols and functions, and a command entity specific to the lower level application (WCCwg ) able to implement the high level command in the specific radio access technology and the characteristics used by that MS 10 vg, for GSM, CDPC, and so on. As in MS 10, the control within the MSC 12 according to the present invention is also divided into an SCCM.SC which implements the aforementioned normal call control functionality, eg, 3-ISDN and WCC. SC implements the functionality call control. radio access that depends on the technology described above. The MSC 12 also includes a Wireless Network Resource Manager (WNRH) to handle the specific radio resources and available access network transport resources. The MSC 12 further includes a Fixed Side Call Control (FCC) to handle the call control functionality towards at least one service node in a fixed or control switched network, as will be described in greater detail below.

- It should be understood by those skilled in the art that the respective pair of SCC and WCC for each MS 10 and MSC 12, respectively, when functionally combined constitute the call control of the traditional mobile system. As shown in Figure 1, SCCMS connects to SCCM.SC WCCMS connects to WCC .SC s However, unlike MSC 12 where SCCjrs and WC ^ s are connected, in MSC 10 there is no connection or relationship direct between SCCM_S and WCCM.S • It must be understood that FCC implements similar call control functionality as it is found in the network, with which MSC connects. If MSC 12 connects with several types of networks, eg, with B-ISDN and N-ISDN, then MSC 12 must be equipped with the FCC functionality capable of interacting with the call control functionality in both networks, ie in MSC 12 there must be FCC for both networks. It should also be understood that MSC 12 also contains an Interworking Functions (IWF) module that implements the bearer services offered by the mobile network, with reference also to Figure 2, the aforementioned IWF is shown within MSC 12. , providing an end-to-end bearer connection from MSC 10 to SN 16. It should be understood, however, that the connection of the radio bearer between MS 10 and the IWF in MSC 12 is controlled by the WCC protocol. Also, while Figure 1 illustrates the control plane entities that are used in the communication between MS 10 and the service node 16, Figure 2 illustrates the connections of the user's plane carrier between them. The interworking functions convert the user data from a used format through the radio interface into a format used in normal fixed networks. There are separate inter-works functions for each core network. The FCC and the fixed work call control entities establish and control the connection of the fixed network bearer. It should be understood that the connection of the end-to-end carrier constituted by the concatenation of the connection of the radio bearer and the connection of the fixed network is controlled, in turn, and established by the SCC protocol. The operation of the system will now be described again with reference to Figure 1. As a preliminary matter, it should be understood that the random access procedures required for channel assignment of signals are carried out first. After the MS 10 call is initiated, SCCMS sends a conventional high-level message to SCCM.SC in MSC ^ 2. Preferably, the established message transmitted conforms to a protocol - - known, e.g., using the layer 3 specification of Network Interface (UNI) -User of normal B-ISDN for basic call / connection control, i.e., using ITU-T Recommendation Q.2931. During the reception, S CM.SC examines the elements of the information of the established message. The parameters related to the requested bearer services are then sent to WCC .SC These radio interface connection parameters include, eg, parameters related to bandwidth, quality of service in terms of delay and variation of delay, and so on. . It should also be understood that the optional information elements or other modifications can be made to the normal Q.2931 message protocol, mentioned above, to better adapt the Q.2931 protocol to a wireless environment. During receipt, WCCM.SC examines the message parameters sent by SCCM.SC and translates the message parameters to conform to the specific radio access technology characteristics used in the transmission. Of course, it should be understood that the aforementioned transfer process within WCC SC using the above described IWF module illustrated in Figure 2, produces both different parameters as connections for the systems of different telecommunications, e.g. , GSM and Broadband Code Division Access (CDMA). The communication with WNRH is determined by the parameters of WCCM.SC previously mentioned, whereby WNRH resources are requested. The location, i.e., cell and sector of MS 10 in question is already known to WNRH through normal mobility management transactions in a common signal channel. On the basis of the aforementioned parameters sent via WCCM.SC WNRH determines whether or not a new user data connection is possible to the specific cell (MS 10) and sends an acceptance or rejection signal to WCCM.SC ^ i can When the connection is made and the communication is accepted, WCCM.SC asks WNRH to reserve the necessary resources for the connection. It should be understood that WNRH can then allocate the required resources by itself. During the acceptance of the connection, WCC _SC sends an adjustment message to WCCJVJS including the parameters that depend on the radio access technology required in order to establish the requested carrier (s). The request for establishment may be claimed from WCCM.S 'e.g., on the grounds that resources are lacking in the mobile station (ie MS 10 can not handle the requested bearer). If the connection is acceptable, without - - However, WCC .S sends a recognition signal to WCC _SC • Upon receipt of the above-mentioned recognition signal, WCCM.SC sends an acknowledgment signal to SCC .SC in MSC 12. It should be understood that SCCM.SC while Initially contact with WCC .SC And send the previously described service parameters, you can also send a message to FCC. It should also be understood that the parameters in the FCC message from SCCSMC are preferably a subset of those of the original establishment request from SCCM.S where the requested connection is to an ATM network, such as illustrated in Figure 1 with the reference number 14. It should also be understood, however, that the parameters in the SCC message exchange S_SCCM.SC describe the end-to-end service and in an ATM network the preference parameters are the same. In the case of an N-ISDN network, however, a transfer of the parameter must be carried out. _ FCC allows during receipt of the parameters of the FCC message described above, it sends a message to the ATM network 14 mentioned above for a connection with the call control functionality in particular the Service Node 16 indicated by SCCMS in the application original establishment. FCC plus it reserves resources for the connection between MSC 12 and the ATM network 14, that is, the exchange terminal, the interface between which, as discussed, is of the type of the network node interface. After the FCC receives a message from the network 14 ATM that resources with the specific Service Node 16 are reserved, FCC sends a message to SCCM.SC to this effect and SCCM.SC in turn notifies SCCM_S ° that the other end of the connection is ringing. When FCC receives a connection message from the ATM network 14, SCCM.S sends a connection message to SCC .S. SCC ^ s upon receipt of the connection message, sends a recognition message back to SCCMjg c2 which carries out a complete connection from MS 10 with the specific Service Node 16 in the mobile network. It should be understood that the above-mentioned complete connection includes the connection of IWF with the MS 10 through different devices. SCC ^ Sc then instructs the FCC to send a connection acknowledgment message to the ATM network 14 which completes the complete connection with the specific Service Node 16. In the aforementioned manner, a virtual channel is created that links the mobile subscriber with a wired or wireless user. The procedures for establishing calls and connections are the same and independent of the specific service used, that is, - - use, the same functional call control entities and signal protocols, providing uniformity in the use of access network transport resources - and radio. As discussed, the system and method of the present invention preferably provide: a mechanism similar to B-ISDN for mobile access. For example, in the case of a packet data connection with a Transmission Control Protocol / Internet Protocol (TCP / IP) network, the "Public Land Mobile Network (PLMN) call control in question, eg, GSM, AMPS, etc., is in charge of establishing the virtual connection between MS 10 and the ATM network 14 connected to the TCO / IP network, as "in B ^ 7TSDN. The establishment of this virtual channel, however, does not permanently reserve transportation resources within PLMN. Instead, resources are reserved and used only when they are needed, leading to scarce resources in this way. It must be understood that the control of the real carrier within PLMN is the responsibility of the WCC function. The introduction of Tlamamada control procedures similar to B-ISDN and the separation of call connection control in mobile access allows the integration of call control procedures of all services, including packet data services, creating a call control mechanism generic and a uniform call control message exchange through the .interface of air for all services. The control of the connection is handled separately inside, __ of PLMN through virtual connections. Although an embodiment of the present invention directed to the creation of a virtual connection with an entry access between PLMN based on A7DM and Internet, it is described, eg, in relation to the use of IETF ^ RFC 1755 (support of ATM signals for the Internet Protocol through ATM) to transfer the Internet Protocol (IP) datagrams between MS 10 and the internet access path, other modalities within the scope of the present invention should be considered as well. For example, the _red to which MSC 12 (or PLMN) connects, may not be. an ATM-based B-ISDN network and instead can be an N-ISDN network or other similar network. The foregoing description is "of a preferred embodiment for implementing the invention, and the scope of the invention should not necessarily be limited by this description." The scope of the present invention is instead defined by the following claims.

Claims (17)

R E I V I N D I C A C I O N S

1. A telecommunications system for connecting a terminal of the mobile subscriber with a service node, the system comprises: a Mobile Service Center in radio communication with said terminal of the mobile subscriber and wired communication with the service node; a means of radio call control both within the Mobile Service Center and the mobile subscriber terminal, the control means of Hamada_.de radio coordinates the radio communication between them; and the service call control means both within the Mobile Service Center and the mobile subscriber terminal, the service call control means coordinating the wired communication with the service node, the service call control means within of the Mobile Service Center being connected to the radio call control means therein, and the service call control means within the terminal of the mobile subscriber being disconnected from the radio control call means.

2. The telecommunications system according to claim 1, further comprising: a means of managing wireless network resources, within the Mobile Service Center to coordinate the resources used through the means of radio call control and the means of service call control.

3. The telecommunications system according to claim 2, wherein the wireless network resource management means allocates the resources and the radio and wire communications are accepted.

4. The telecommunications system according to claim 2, wherein the wireless network resource management means rejects resource allocation if radio or wire communications are rejected.

The telecommunication system -in accordance with claim 1, further comprising: a fixed lateral call control means within the Mobile Service Center and connected to the service call control means therein to coordinate the communication wired with ~~ the nodule. of service. i ~ 6.

The telecommunications system according to claim 5, wherein the fixed lateral call control means coordinates the wired communication according to a given network of a multiplicity of telecommunications networks fixed to it.

The telecommunications system according to claim 1, further comprising: a means of interworking function within TL Mobile Service Center for converting a radio communication from the mobile subscriber terminal with a determined wired communication mode.

The telecommunication system according to claim 7, wherein the interworking function means coordinates the conversion in accordance with a given mode of a multiplicity of wired communication modes.

9. The tel comunication system according to claim 1, further comprising: a means of. synchronous transfer mode to connect the Mobile Service Center with the service mode.

The telecommunication system according to claim 9, wherein the synchronous transfer mode means is a Broadband Integrated Services Digital Network.

11. The telecommunications system according to claim 1, wherein the node of service is a gateway to another telecommunications system.

The telecommunication system according to claim 11, wherein the service node is an access path between the Transmission Control Protocol / Internet Protocol network.

13. In a telecommunications system that has a mobile subservice terminal in communication with a Mobile Service Center (MSC), the Mobile Service Center is a wired communication with a service node., a method for connecting the mobile subscriber terminal (MT) with the service node, the method comprising the steps of: receiving, within a service call controller MSC within the terminal of the mobile subscriber, a request for establishment of call from a service call controller MT within the terminal of the mobile subscriber with the service node, the call set-up request contains in the same interface connection parameters; _ sending, from the MSC service call controller, the interface connection parameters of the call set-up request to a wireless call controller MSC within the Mobile Service Center; establish run resource link between the mobile subscriber terminal and the service node; and during the establishment of the resource link, send, from the wireless call controller MSC to a wireless call controller MT within the terminal of the mobile subscriber, a call set-up request response to the call set-up request, establishing in this way a communication link between the terminal and the mobile subscriber and the service node.

14. The method of conformance .. with claim 13, wherein in the receiving step, the call set-up request is a high-level message according to an ISDN protocol.

15. The method according to claim 13, wherein in the step of establishing the resource link, a resource handler connected to the wireless call controller MSC establishes the resource link. -

16. The method of conformance with claim 15, wherein the resource handler converts the interface connection parameters with a plurality of radio access parameters with the resource link.

17. The method according to claim 13, wherein after the step of receiving the call setup request, the service call controller MSC sends a plurality of service parameters to a fixed side call controller, establishing the call controller lateral fixed the resource link.