PROCEDURE AND ARRANGEMENT FOR ACCESS CONTROLLED BUFFERING FOR MOBILE INFORMATION SERVICES

Abstract: The invention relates to a procedure and arrangement for buffering for mobile information services in a telecommunications system. In the telecommunications system is included at least one information supplying server (9) to which mobile terminals (10) can be connected by means of different connections (4, 5, 6, 7). The different connections in general have different performance. According to the invention, the information from the server is buffered in cache memories (8a, 8b, 8c), which are placed in connection to a respective connection, depending on the performance and/or duration of respective connection. In addition, the information from the server is preferably updated in the cache memories according to a schedule that also is depending on the characteristics of respective connection. The invention makes possible a linking of stored information with an end user via a mobile terminal in an efficient way, thanks to that the information is buffered in different places in the telecommunications network depending on the characteristics of the connection that the mobile terminal utilises. By that, the information is continuously balanced between the terminal and the information supplier's server.

Description: PROCEDURE AND ARRANGEMENT FOR ACCESS CONTROLLED BUFFERING FOR MOBILE INFORMATION SERVICES Field of the invention The present invention relates to a procedure and arrangement for access controlled buffering for mobile information services. By mobile information services is meant that a mobile terminal with different kinds of connection from different places derives information from an information supplying server by means of a telecommunications system. The invention facilitates linking of stored information with an end user via a mobile terminal in an efficient way, thanks to the information being buffered in different places in the telecommunication network, depending on the characteristics of the connection that the mobile terminal utilises. The information is buffered in cache memories placed in the network. By that, the information is continuously balanced between the terminal and the information supplier's server. Prior art A certain type of buffering for mobile services exists today. The buffering functions that are described in available reference architectures, for instance the repository function in WAP (WAP-WTA) , is, however, primarily utilised to remember previously used services and not to support the existence of, for instance, subscriptions and off-line use. The products that exist on the market today utilise in principle exclusively some kind of channel concept. The channel concept, which inter alia is included in both Netscape's and Microsoft's stationary browsers (version 3.0+) , is briefly based on, at certain points of time, loading down information from indicated websites that then can be read off-line. In the mobile solutions, for instance Microsoft's Mobile Channel Architecture, one, instead of a time-bound down-loading, tries to use the synchronisation that the user in any case is making of his/her calendar. The disadvantage of Microsoft's solution is that it is limited to an own format (CDF) which only allows read-only-material. A competitor of Microsoft is the niche company AdvantGo. AdvantGo offers a server based NT-solution for administration of the mobile user's channels. This is made via a simple web interface. The server also comprises a support for direct synchronisation towards internal databases of companies. On the client side, AdvantGo supports both Palm OS and Windows CE by an own synchronisation software. In contrast to Microsoft's solution, AdvantGo utilises HTML 3.2-format and supports off-line input/framing of questions, which is performed as soon as the terminal is on-line. AdvantGo also includes data compression for faster downloading to the terminal. Mobile channels of today are primarily designed for downloading on-line and use off-line. A problem with the known technology is that the amount of information that is to be transferred is so large that the terminal will have long execution times to handle the information, especially at connections with low transmission capacity. The present invention solves the problem by buffering the information in the system, especially in cache memories locally placed. The buffering and the updating of the cache memories is made depending on the characteristics of the available kind of connection of the mobile terminal. At each application, the user first consults the cache memory that is closest, in order to by that obtain shorter response and execution times. Summary of the invention Consequently, the present invention relates to a procedure for access controlled buffering for mobile information services in a telecommunications system that has at least one information supplying server to which mobile terminals can be connected by means of different connections. The different connections generally have different performance. According to the invention, information from the server is buffered in cache memories, which are placed in connection to a respective connection, depending on the performance and/or duration of respective connection. In addition to that, the information from the server is preferably updated in the cache memories according to a schedule that also is depending on the characteristics of respective connection. The invention also relates to an arrangement to execute the procedure. The invention is defined in patent claim 1 and 8, whereas preferred embodiments are specified in the subordinate patent claims. Brief description of the drawings The invention will be described in detail below, with reference to enclosed drawings in which: Figure 1 is a circle diagram over a normal 24 hour variation for a mobile terminal, and Figure 2 is a schedule over an arrangement according to the present invention. Detailed description of preferred embodiments As has been mentioned in the introduction of the specification, the aim of the invention is to link stored information, for instance sound, video or data, with an end user via a mobile terminal. The class of mobile information services that primarily aims at supporting consumption of large amounts of information, for instance electronic books, electronic newspapers, music services, etc need access to a technical solution that synchronises the content of the terminal with that of the network, i.e. a function that continuously balances the information between the terminal and its main memory, an easily accessed memory in the network, for instance of the type cache memory (network cache) and the information supplier's server. The aim of the function is that the user at each application first consults the cache memory that is closest, and by that will have a shorter response time. The invention utilises the fact that the user is mobile and that the user's terminal because of that regularly moves around between different radio based or fixed kinds of connection. Figure 1 shows a circle diagram with a typical distribution of different kinds of connection. The day starts, for instance, with a travel to work, where the user can utilise a mobile telephone system, for instance GSM, to connect his/her terminal. When the user is at his/her office/place of work he/she usually has a fixed connection or radio LAN at hand. During the lunch- break he/she may have possibility to connect via radio LAN in another place at the office/place of work, and after that return to his/her ordinary place of work. During the travel home, he/she again can use GSM, as during ordinary leisure time, or during travels for the firm in other places. During the night he/she has at hand a fixed connection, at home, or, for instance, at staying overnight at hotel. As is shown in Table 1 below, each kind of connection has its own characteristic and suitability to support downloading of information to the mobile terminal, for instance bandwidth, reliability, and cost. These different characteristics can be utilised as a schedule to systematically update the different local places of buffering. For instance during the night, the main memory in the terminal is supplied with new and updated information, at the same time as the "table charger" charges the batteries of the terminal. Also the utilisation of a network connection is rendered more effective by in the background loading down information during a radio LAN- session, with high available bandwidth, in progress. Table 1 In Figure 2 is shown an arrangement according to the invention. A server 9 provides information for distribution in the network to mobile terminals 10, which can be connected in different places 1,2,3. At 1_ is shown a terminal 10 in home environment. There a fixed connection 4 is available. A locally placed cache memory 8a buffers information based on connection of long duration and high transmission capacity. In situation 2 there is the terminal 10, for instance in a car, and the communication is made via a mobile telephone system 5, for instance GSM. The cache 8b stores and updates information according to connection of short duration and low transmission capacity. In situation 3_, the terminal is in office environment. Here both radio LAN 6 and a fixed connection 7 are available, both with high transmission capacity. The connection, however, is usually of shorter duration. A cache memory 8c is updated according to this. According to the invention, there is a function in the network that registers where the terminal is, and which kinds of connection that at that are used, and respective duration of the connection. The function controls the information from the server so that the different cache memories 8a, 8b, 8c are updated in the prescribed way. This function can be controlled in many ways and possibly also be controlled from the terminal side. The above described procedure and arrangement can be implemented in many ways, as is evident to an expert in the field. The scope of the invention is only limited by the patent claims below.

Claims: PATENT CLAIMS 1. Procedure for access controlled buffering for mobile information services in a telecommunications system with at least one information supplying server (9) to which mobile terminals (10) can be connected by means of different connections (4,5,6,7), which connections have different performance, c h a r a c t e r i s e d in that information from the server (9) is buffered in cache memories (8a, 8b, 8c), which are placed in connection to a respective connection, depending on performance and/or duration of respective connection (4,5,6,7). 2. Procedure as claimed in patent claim 1, c h a r a c t e r i s e d in that information from the server (9) is updated in the cache memories (8a, 8b, 8c), according to a schedule that is depending on the performance and/or duration of respective connection (4,5,6,7) . 3. Procedure as claimed in patent claim 1, or patent claim 2, c h a r a c t e r i s e d in that respective performance includes bandwidth, reliability and cost . 4. Procedure as claimed in any of the previous patent claims, c h a r a c t e r i s e d in that, at a fixed connection with high bandwidth and long duration, large amounts of data, subscriptions and known interests, are downloaded to respective cache memory. 5. Procedure as claimed in any of the previous patent claims, c h a r a c t e r i s e d in that at a radio connection with high bandwidth and short duration, services are loaded down that are used on-line to respective cache memory . 6. Procedure as claimed in any of the previous patent claims, c h a r a c t e r i s e d in that at a radio connection with small bandwidth and short duration, single objects are downloaded, and interests and subscriptions are updated to respective cache memory. 7. Procedure as claimed in any of the previous patent claims, c h a r a c t e r i s e d in that the telecommunications system registers the movements of a mobile terminal (10) and plans the buffering schedule for the different cache memories (8a, 8b, 8c). 8. Arrangement for access controlled buffering for mobile information services in a telecommunications system with at least one information supplying server (9) to which mobile terminals (10) can be connected by means of different connections (4,5,6,7), which connections have different performance, c h a r a c t e r i s e d in cache memories (8a, 8b, 8c), which are placed in connection to a respective connection, for buffering of information from the server (9) depending on the performance and/or duration of respective connection (4,5,6,7). 9. Arrangement as claimed in patent claim 8, c h a r a c t e r i s e d in that the cache memories (8a, 8b, 8c) are arranged to update information from the server (9) according to a schedule that is depending on the performance and/or duration of respective connection (4,5,6,7) . 10. Arrangement as claimed in patent claim 9 or 10, c h a r a c t e r i s e d in that the telecommunications system is arranged to register the movements of a mobile terminal (10), and to plan the buffering schedule for the different cache memories (8a, 8b, 8c).

Inventors: HEDSTROEM ANDERS, HEDSTROEM, ANDERS
Applicants: HEDSTROEM ANDERS, TELIA AB, HEDSTROEM, ANDERS, TELIA AB (PUBL)
Application year: 2000
Main classification: H04Q7
IPC codes: H04L12, H04L29, H04W4