FIELD OF INVENTION 
     This invention relates to systems and methods for gathering and refining web browsing information, to be delivered as mobile content to a mobile wireless terminal, preferably using the best available delivery mechanism. 
     BACKGROUND INFORMATION 
     Internet browsing from stationary terminals such as a personal computer has become very popular and is essential to attract people to view value-added services on the internet. Mobile operators would prefer a wireless terminal device to be the most popular means by which the public accesses the internet. However, a majority of the internet services available today to the stationery terminal user cannot easily be delivered to the wireless terminal user for a variety of reasons including network capacity issues, slow web services, web pages designed for personal computers, rather than wireless terminals, as well as limitations on the browsing capabilities of the wireless terminals themselves, much to the dismay of wireless terminal users and operators alike. 
     For example, a wireless terminal user attempting to view medium to high density graphical content in real-time over a traditional wireless network will quickly become frustrated by the time delays resulting from traffic on the cellular and/or Internet networks, as well as the time delays imposed by the web service from which the user has requested the content. While traditional mobile operators have repeatedly attempted to deliver web-based content in real-time over a wireless network, they have been largely unsuccessful at minimizing the foregoing delays and ameliorating user frustration. 
     Therefore, there exists a need for a system and method whereby a mobile user can browse web-based content with ease from a wireless terminal. 
     SUMMARY OF THE INVENTION 
     In a preferred embodiment of the invention, there are provided a system and method whereby a user&#39;s browsing content habits can be tracked in a database allowing updates of content associated with the more frequently visited and related content (FVARC) sites to be downloaded to a user&#39;s wireless terminal. The user has the option of having the content updates linked to a delivery class, e.g., real-time delivery or, alternatively, delivery at a time when the cellular network is least utilized. 
     Briefly, in the preferred embodiment, the user browses a data network such as the Internet using a wireless terminal. A Mobile Browsing Booster System (MBBS) maintains a user database (e.g., a personal network cache) of the user&#39;s viewing habits. A browsing agent within the MBBS analyzes those habits using data mining techniques to determine the most frequently visited content and related content (e.g., URL&#39;s and web pages, whether whole or “stripped down” versions thereof). Periodically, the MBBS forwards the FVARC to a selected Mobile Content Delivery (MCD) System for delivery to the mobile terminal. The details of the MCD system are described in co-pending application Ser. No. 09/944,443, filed Aug. 31, 2001, a copy of which is incorporated herein by reference. 
     The MCD system acts as the scheduled delivery engine that calculates the predetermined time window during which the FVARC is to be delivered to the wireless terminal. The time window of delivery is calculated preferably taking into account such information as a delivery class specified by the user of the wireless terminal, the wireless network usage and relative capacity, as well as the terminal type and capabilities thereof. Depending on the message criticality, the FVARC can be scheduled for delivery during minimal network usage traffic time periods for least expense unless delivery in real-time was requested by the user. During the scheduled delivery time window, the MCD system delivers the FVARC to the wireless terminal. The process of monitoring and analyzing viewing habits and gathering FVARC for delivery to the wireless terminal is repeated with a user-specified frequency to ensure that the user&#39; terminal cache has the latest FVARC for local browsing. 
     The system and method of the present invention permits a wireless terminal user to browse FVARC stored in the terminal&#39;s local cache memory in a time-efficient manner without a wireless network connection. Thus, the wireless terminal user can read a large number of web pages quickly using offline browsing, instead of reading the pages over a network with unpredictable response times. Moreover, when combined with the MCD System, the present invention allows service operators to maximize their use of the wireless network air interface time resulting in a reduction in cost to send content updates over the wireless network. Thus, the present invention introduces a mechanism by which mobile operators can provide wireless terminal users with web-based content that previously could only be viewed at stationary terminals, resulting in a cost reduction of data services, thus enabling more services to become available and attracting more users. 
     Other and further aspects of the present invention will become apparent during the course of the following description and by reference to the attached drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a block diagram illustrating an exemplary implementation of the Mobile Browsing Booster System (MBBS) in accordance with one embodiment of the present invention. 
     FIG. 2 is a block diagram illustrating an exemplary implementation of the MBBS of the present invention in greater detail. 
     FIG. 3 is a flow chart illustrating an exemplary process by which updated content is generated and delivered to a wireless terminal in accordance with one embodiment of the present invention. 
     FIG. 4 is a flow chart illustrating the exemplary process of FIG. 3 in greater detail. 
     FIG. 5 is a diagram illustrating some of the benefits that can be achieved by updating web-based content at the wireless terminal&#39;s cache memory  10   a  at an opportune time in accordance with the present invention. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     FIG. 1 is a block diagram illustrating an exemplary implementation of a Mobile Browsing Booster System (MBBS) in accordance with one embodiment of the present invention. As shown in FIG. 1, an individual may use a hand-held wireless terminal  10  (e.g., a cellular phone) enabled with a browser to browse web-based content available from web services  12  via a data network such as the internet. 
     In accordance with one embodiment of the present invention, the user of the wireless terminal may register to receive periodic updates of the user&#39;s frequently visited and related content (FVARC) for storage in the terminal&#39;s cache memory to enable local browsing of such content. To register for the service, the user of terminal  10  may access Mobile Content and Delivery system  16  and provide it with a user profile and a class of delivery for the FVARC. The user profile may include the user-defined parameters for FVARC updates, such as the type of FVARC that the user would like updated to the terminal&#39;s cache, the frequency of the updates, etc. The class of delivery may be delivery at a time when the cellular network is least utilized or, alternatively, in “real-time” (as discussed in co-pending application Ser. No. 09/944,443, filed Aug. 31, 2001) when triggered by an event specified in the user profile such as a predetermined period of time having elapsed since the last update was transmitted to the wireless terminal  10 . It will be understood that upon registering, the user can at any time thereafter contact MCD system  16  and update his profile to change one or more of the user-defined parameters, including the class of delivery. 
     Once the user has registered for the service, a Mobile Browsing Booster System (MBBS)  14  monitors the user&#39;s browsing habits and stores information concerning those habits in a user database. The stored information may include the http address of a browsed site and the content that the user accessed at the site (e.g., web page(s)). Over time, the MBBS  14  analyzes the stored information to identify frequently visited content and related content using data mining techniques. In addition, during the user&#39;s browsing sessions, MBBS  14  also retrieves wireless terminal  10 &#39;s capabilities and status to determine the type of content that terminal  10  is capable of presenting to the user. MBBS  14  uses this information to, if possible, modify the FVARC into a format suitable for presentation on terminal  10  or, if not possible, delete such content from its database altogether. 
     MBBS  14  forwards the analyzed content in the form of FVARC to the MCD system  16 , which schedules delivery of the FVARC to terminal  10  by analyzing the class of delivery previously specified by the user, the existing network activity loading and the content size. At the scheduled delivery time, the MCD system  16  delivers the content to the wireless terminal  10 . 
     FIG. 2 is a block diagram illustrating an exemplary implementation of the MBBS  14  in greater detail. The network components shown in FIG. 2 for purposes of illustrating the exemplary implementation are: a cellular network  20 ; a MCD System  16 ; a layer  7  switch/web proxy  28 , the MBBS  14 , which comprises a Browsing Agent  22  and a User Database  24 ; and web services  12 . 
     As discussed above in connection with FIG. 1, the user of wireless terminal  10  registers with MCD system  16  for the mobile browsing booster service of the present invention or updates his user profile if already registered, in any number of ways known in the art such as via a wireless connection over cellular network  20 , via postal mail or the like. Thus, in so doing, the user defines a user profile for receiving FVARC updates to the terminal cache  10   a  of his wireless terminal  10  and, as part of his profile, may also select the class of delivery for such updates. 
     MCD System  16  then relays the user profile (newly created or updated) to MBBS  14  for storage in user database  24 . User database  24  includes a user profile and a personal network cache for each user, wherein FVARC is stored pending delivery to wireless terminal  10 , as will be described in detail hereinafter. 
     As shown in FIG. 2, a registered user browses web services  12 , and thus, visits web sites that contain content such as web page  26 . Wireless terminal  10  receives the browsed content over a data network such as the Internet, an extranet, an intranet LAN or the like over a wireless connection via a cellular network  20 . The L 7  switch/web proxy  28  monitors web traffic, identifies content browsed by wireless terminal  10  as corresponding to a terminal that has registered for the mobile browsing booster service and transmits a copy of that content to the MBBS  14  for storage in the user&#39;s personal network cache in user database  24 . 
     The Browsing Agent  22  of MBBS  14  begins gathering frequently visited and related content (FVARC) by monitoring content stored in the user&#39;s personal network cache for frequency and preferably also type (i.e., the number of visits to the site associated with the content and the type of content). Thus, the gathered content may comprise either frequently visited content of any type or frequently visited content of a specific type (e.g., a predefined group, such as “sports”), depending upon what is required by the user&#39;s profile. If the user has requested updates only of frequently visited content of a specific type, browsing agent  22  may use data mining techniques to cull such content from all of the content stored in the user&#39;s network cache. 
     Browsing agent  22  may also use data mining to supplement the FVARC with “related” content—e.g., URL&#39;s and web pages of sites that the user would likely have an interest in visiting in the future. For example, the browsing agent  22  may supplement FVARC with content retrieved from the personal network caches of other users whose profiles indicate that they have similar interests as those of the user for whom the FVARC is being gathered (provided that the profiles of the other users permit such snooping). Browsing agent  22  may further supplement FVARC by determining that the content frequently visited by the user belongs to one or more pre-defined groups (e.g., news, sports, content that is high or low in graphics, content from specific types of web services, etc.) and by searching the data network via the L 7  switch/web proxy  28  for web services that contain content from those groups. As indicated above, the browsing agent  22  may already know the pre-defined groups from the user&#39;s profile or may use data mining to ascertain the groups from the content frequently browsed by the user. 
     Based upon the frequency of updating FVARC specified in the user&#39;s profile (e.g., some profiles may specify that updates occur more frequently than others), the MBBS  14  forwards the FVARC to the MCD system  16 . (See reference numeral  25  in FIG. 2) MCD system  16  schedules delivery of the FVARC to the wireless terminal  10  within a particular time window determined by analyzing the user-selected class of delivery, the existing network activity loading, the content size and the cell location. Thus, MCD system  16  may retrieve wireless network activity updates and current cell user location from the Cellular Network  20 . Depending on network data activity, the MBBS  14  may re-direct the FVARC to another MCD system  16  having a lighter network server data activity load. 
     When the time window for delivery arrives, the MCD system  16  delivers the FVARC to the end-user at the wireless terminal  10  via the cellular network  20 . Once the FVARC has been delivered, the user can open the browser of his wireless terminal  10  and browse web pages from the terminal&#39;s cache memory without the need for a live wireless network connection. Thus, the user&#39;s browsing sessions will have minimal time delays making the experience a pleasant one. At some point, however, if the user selects a link that leads to a web page that is not stored in the terminal cache  10   a , the terminal  10  will need to establish a network connection to retrieve that web page. 
     It will be readily apparent to those skilled in the art that numerous variations in the architecture and functionality depicted in FIG. 2 can be made without departing from the spirit or scope of the present invention. For example, an equivalent of database  24  (with personal network caches) could be located at L 7  switch/web proxy  28 , rather than at MBBS  14 , in which case the browsing agent  22  would perform the content optimization process by accessing the personal network caches stored therein. Alternatively, both L 7  switch/web proxy  28  and MBBS  14  could maintain personal network caches for each user. In this embodiment, the content in the MBBS  14  caches could mirror the content in the switch/web proxy  28  caches or, the caches in switch/web proxy  28  could be used to store all browsed content (with content optimization being performed by accessing that content) and the caches in database  24  of MBBS  14  could be used to store only FVARC. 
     FIG. 3 is a flow chart illustrating an exemplary process by which updates of FVARC are generated and delivered to a wireless terminal in accordance with one embodiment of the present invention. In step  300 , the user browses web-based content via a wireless terminal  10 . In step  302 , the user chooses either a User-selected or Auto-Selected class of delivery, as discussed in co-pending application Ser. No. 09/944,443, filed Aug. 31, 2001, for receiving updates of FVARC. In step  304 , the browsing agent  22  of the MBBS  14  monitors the user&#39;s browsing activity and selects content of the type and the amount specified by rules in the user&#39;s profile. For example, MBBS  14  may monitor for all hockey news that does not include graphics. Browsing agent  22  then stores the selected content and associated URI,s in the user&#39;s network cache in user database  24  of the MBBS  14 . In step  306 , browsing agent  22  analyzes the selected content to determine frequently visited content. If required by the user&#39;s profile, in step  308 , the browsing agent  22  also gathers content related to the frequently visited content. Thus, in step  310 , the browsing agent  22  generates a list of frequently visited and related content (FVARC). If also required by the user&#39;s profile, the browsing agent  22  will periodically access the latest (i.e., “freshest”) version of the FVARC and replace therewith the older version of the content in the user&#39;s network cache. 
     In step  312 , browsing agent  22  forwards the FVARC to an MCD system  16 . In step  314 , MCD system  16  schedules a window of time for delivery of the FVARC to wireless terminal  10 , taking into account the user-specified class of delivery. In step  314 , at the appropriate time, MCD system  16  delivers the FVARC to wireless terminal  10 , where it is stored in the terminal&#39;s cache  10   a , and thus, is available for local browsing. 
     FIG. 4 is a flow chart illustrating the exemplary process of FIG. 3 in greater detail. As shown in FIG. 4, a wireless terminal  10  can access web services  12  via cellular network  20 . Content visited by wireless terminal  10  passes through one or more L 7  switches equipped with a web proxy  28 . In step  400 , L 7  switch/web proxy  28  determines whether the wireless terminal  10  has registered for the mobile browsing booster service. In this regard, the MCD system  16  can provide switch/web proxy  28  with an identity of registered users (e.g., a mobile station&#39;s ISDN number). The switch/web proxy  28  can then compare the identity provided by MCD system  16  with an identifier from the user&#39;s browsing session (e.g., the MSISDN number) to link an HTTP/IP stream to a registered user. Alternatively, switch/web proxy  28  can attempt to use the identifier from the browsing session to access a user profile in user database  24  or an existing wireless user identity database to determine whether the web traffic is associated with a registered user. 
     If the switch/web proxy  28  determines that the mobile browsing booster service is not enabled for wireless terminal  10 , switch/web proxy  28  passes the browsed content to the wireless terminal  10  without sending a copy to MBBS  14 . However, if the mobile browsing booster service is enabled for this user, a copy of the browsed content is sent to MBBS  14  for storage in the user&#39;s personal network cache in user database  24 . 
     In step  402 , browsing agent  22  of MBBS  22  determines whether wireless terminal  10  has ever before visited the web site. If this web site is newly visited, then, in step  404 , the browsing agent  22  adds the http address (e.g., the URL) of the web site and the associated content into the user&#39;s personal network cache in user database  24 . Over time, the user&#39;s browsing history will be stored in the network cache. Regardless of whether or not the current web site is newly visited, in step  406 , browsing agent  22  performs data mining techniques on the content stored in the user&#39;s network cache to identify frequently visited content of the type (e.g., sports, weather, news, etc) indicated in the user&#39;s profile. 
     The user&#39;s profile is then checked to determine whether the frequently visited content is to be supplemented with additional content that may be of interest to the user. This “related” content is added to the frequently visited content thereby generating frequently visited and related content (FVARC). Thus, in step  408 , browsing agent  22  determines whether the user&#39;s profile allows content related to the frequently visited content and the latest version of such content is to be fetched from web service(s)  12 . If fetching of related content and the latest version thereof is allowed, in step  410 , browsing agent  22  accesses web services  12  via a data network and retrieves such content. If the user&#39;s profile permits, browsing agent  22  may also access the latest version of frequently visited content at this time. It should be noted that L 7  switch/web proxy  28  may be capable of automatically synchronizing content accessed by either wireless terminal  10  or browsing agent  22  and stored in its cache with the latest available versions of that content. In that case, browsing agent  22  would be able to obtain the latest versions of either frequently visited content or related content from switch/web proxy  28 , rather than from web services  12 . 
     Thereafter, in step  412 , browsing agent  22  determines whether the user profile allows fetching of the most popular TOP100 pages or the like. The TOP100 pages can be retrieved in any number of ways such as from a global cache in web proxy  28  or from other network servers where such lists may reside or may even be compiled by browsing agent  22  from content in the network caches of other users in user database  24 . If fetching of the most popular TOP100 pages is allowed, in step  414 , these pages are added to the user&#39;s network cache in user database  24 . 
     In step  416 , the browsing agent  22  accesses the user profile to determine whether an update of FVARC should be sent to the terminal cache  10   a  of wireless terminal  10 . As discussed above, the frequency of FVARC updates may vary depending upon the frequency specified in the user profile. If an update should not yet be made, in step  418 , browsing agent  22  continues optimizing the content of the user&#39;s network cache by repeating steps  400  through  418 . 
     As content optimization steps  400  through  418  are repeated, browsing agent  22  also performs maintenance on each user&#39;s personal network cache by removing content that is infrequently accessed or which is related to content that is infrequently accessed. Browsing agent  22  preferably also converts content into a format and size suitable for a wireless terminal (e.g., using wireless mark-up language (wml) and/or wireless application protocol (wap)). If such conversion is not possible, browsing agent  22  may delete such content entirely from the user&#39;s network cache. Moreover, to facilitate filtering of FVARC by the user, browsing agent  22  may highlight the most frequently visited content to distinguish it, e.g., from related content prior to transmission to MCD system  16 . Alternatively, or in addition thereto, agent  22  may also highlight the portion of the FVARC that has changed since the last time FVARC was transmitted to wireless terminal  10 . Highlighting may involve adding colors or bold text to the wml/html code of the web content in a manner well known to those skilled in the art. 
     If the user profile indicates that an update of FVARC should be made, browsing agent  22  sends the FVARC to MCD system  16  together with a “go-ahead” message instructing MCD system  16  to update the user&#39;s terminal cache  10   a . The Mobile Content Delivery (MCD) system  16  schedules delivery of the FVARC by analyzing the class of delivery, the existing network activity loading, which it receives from cellular network  20 , and the content size. The FVARC is then delivered to wireless terminal  10  by means of cellular network  20 . 
     FIG. 5 is a diagram illustrating some of the benefits that can be achieved by updating web-based content at the wireless terminal&#39;s cache memory  10   a  at an opportune time in accordance with the present invention. The vertical axis represents a wireless network&#39;s air interface capacity in kilobits per channel per user and the horizontal axis represents the twenty-four hour day time cycle of the wireless network. 
     As shown in the graph, typical air interface capacity has a ceiling of 10 kilobits per second (Kb/s) per user channel unless the operator is willing to invest in additional hardware to increase the capacity to possibly 12 Kb/s per user channel. Above 12 Kb/s channel capacity is where messaging, online browsing, and other shared data applications reside. 
     As illustrated in the chart of FIG. 5, without the present invention, at approximately the ninth hour, the network air interface capacity is being fully utilized allowing for a limited bit rate per user of only 2 Kb/s, which results in a 20 second load time to update a 5 kilobyte (KB) web content page. With the Mobile Browsing Booster System  14  implemented that same 5 KB web content page will be loaded into the cache memory of wireless terminal  10  in 2 seconds for a hit-rate of ⅔, and 5 seconds for a hit-rate of ½. It should be noted that the hit-rate is based on the fraction of web pages that have a delayed class of delivery out of a 200 web page sample. 
     In the other two cases without the present invention, bit data rates per user of 4 Kb/s and 10 Kb/s will result in 5 KB web page load times of 10 seconds and 4 seconds respectively. In comparison, with the present invention implemented, web page load times of 1 second and 0.4 seconds respectively can be achieved at the ⅔ hit-rate for that same web page. For a hit-rate of ½, web page load times slightly increase to 2.5 seconds and 1 second respectively. 
     The wireless terminal  10  will have previously browsed FVARC content stored in its local cache memory, the improvements in user-browsing update loading times can be as much as 10 times faster than that of a system without the Mobile Browsing Booster System  14  implemented. 
     RAMIFICATION AND SCOPE 
     Although the description above contains many specifics, these are merely provided to illustrate the invention and should not be construed as limitations of the invention&#39;s scope. Thus, it will be apparent to those skilled in the art that various modifications and variation an be made in the system and processes of the present invention without departing from the spirit or scope of the invention. Accordingly, it is intended that the present invention cover its modification and variations provided they come within the scope of the appended claims and their equivalents. In this context, “equivalents” means each and every implementation for carrying out the functions in the claims, even if not explicitly described herein.
A mobile browsing booster system and method that allows a user to browse web services, select a class of delivery using the browser, and receive updates of frequently visited and related content at his or her wireless terminal, such as a cellular phone. The system is comprised of two parts; a browsing agent and a user database. The combination stores and analyzes a user's web-browsing habits to create personalized and optimized content to be preferably time-delay delivered to the memory of the user's wireless terminal device, at a time when the wireless network is least utilized. The scheduling of delivery is accomplished by a mobile content delivery system.