WO2001065767A2

WO2001065767A2 - Method and system relating to multicasting

Info

Publication number: WO2001065767A2
Application number: PCT/US2001/006786
Authority: WO
Inventors: Jozsef Kiraly
Original assignee: Chaincast, Inc.
Priority date: 2000-03-01
Filing date: 2001-02-28
Publication date: 2001-09-07
Also published as: WO2001065767A3; AU2001245400A1

Abstract

A method and system are described herein for implementing virtual receivers (e.g., virtual user devices) to optimize data flow within a chaincast communication system. In particular, a plurality of virtual user devices are coupled to the Internet via high bandwidth connections. The virtual user devices can be implemented at an Independent Service Provider (ISP) the ISP providing the high bandwidth connection , can be implemented to share a communication with the chaincast manager, and can be implemented to share a communication connection with one or more of the plurality of broadcast servers. More importantly, the virtual user devices can be remotely controlled by the chaincast manager to connect to a particular broadcast server and to retransmit information from the broadcast server to one or more user devices, reducing the number of chain links (e.g., user device-to-user device) in a chaincast chain. Moreover, a server with chaincast capability is accessed by multiple user devices, each seeking to retrieve identical information from the server. The server activates chaincast capability within each of the user devices. Thus, a chaincast manager provides each of the user devices with a connection to retrieve the information from the server, where the connection can be a chaincast connection with another user device or a direct connection to the server. If any one of the user devices loses its connection prior to retrieving all of the information, the user device communicates with the chaincast manager to request another connection to complete retrieval of the information.

Description

METHOD AND SYSTEM RELATING TO DIGITAL BROADCAST

RELATED US APPLICATION

This patent application is a continuation-in-part of co-pending United States Patent Application Serial Number 09/300,784, filed on April 27, 1999, and entitled "Method and System for Ensuring Continuous Data Flow Between Re-Transmitters Within A Chaincast Communication System", by Jozsef Kiraly, and assigned to the assignee of the present invention, which is incorporated herein by reference and which is a continuation-in-part of co-pending United States Application Serial Number 09/253,117, filed on February 19, 1999, and entitled "Chaincast Method and System for Broadcasting Information to Multiple Systems within the Internet," by Jozsef Kiraly, and assigned to the assignee of the present invention, which is incorporated herein by reference.

This patent application claims the benefit of U.S. Provisional Application No. 60/186,146, filed on March 1 , 2000, entitled "METHOD AND SYSTEM FOR IMPLEMENTING VIRTUAL RECEIVERS TO OPTIMIZE DATA FLOW WITHIN A CHAINCAST COMMUNICATION SYSTEM"

BACKGROUND

FIELD

The present disclosure relates to the field of digital information communication. More specifically, the present disclosure relates to the field of computer implemented digital broadcast communication of information over the Internet. Even more specifically this disclosure includes methods and systems for implementing virtual receivers to optimize data flow within a chaincast communication system. RELATED ART

The Internet is a large network made up of a number of smaller networks. It is made up of more than 100,000 interconnected networks in over 100 countries, comprised of commercial, academic and government networks. It has become commercialized into a worldwide information highway and data base, containing information on virtually every subject known to humankind.

The proper and efficient use of the great amount of information available on various Internet sites has the potential of providing Internet users with a variety of information desired for businesses and individuals. In particular, those users interested in certain segments of the information available on the Internet or those users interested in certain specific Internet sites could benefit tremendously from having their specific information of interest available to them in an automated and interesting manner. Moreover, such users would benefit greatly from being constantly and automatically updated on new information as the new information becomes available on their sites of interest.

Due to the prevalence and popularity of the World Wide Web (also called the "Web") servers around the world, a great number of Internet users are particularly interested in receiving updated information of interest to them from various World Wide Web servers on the Internet. By way of background, the World Wide Web is an Internet facility that links documents locally and remotely. The Web document is called a Web page, and links in the page let users jump from page to page (hypertext) whether the pages are stored on , the same server or on servers around the world. The pages are accessed and read via a Web browser such as Netscape Navigator or Microsoft Internet Explorer.

The Web has become the center of Internet activity because,^~among other reasons, Web pages, containing text, graphics and multi-media content are easily accessible via a Web browser. The Web contains the largest collection of online information in the world, and the amount of information is increasing. Current schemes for accessing a Web document require typing in the URL (Uniform Resource Locator) address of the home page in the Web browser. From there, the user starts "surfing" through the Internet via hypertext links to other documents that can be stored on the same server or on a server anywhere in the world.

The shear size of the information available on the Internet and the

Web has made it a necessity for individuals and businesses to efficiently and constantly sift through the available information in order to find and organize the information that is of interest. More importantly, it is crucial for content providers to efficiently and effectively transmit their information to those desiring to receive the information. Stated differently, individuals and businesses realize that the availability of information itself does not result in a competitive edge unless the information can be efficiently sent from the content provider to the receiver and further unless the information is of interest and of value to the business or the individual.

Figure 1 illustrates a system 70 regarding one use of the Internet. In system 70, the Internet 40 is used to provide a communication channel between a broadcast source 60 (e.g., a Web server) and a number of receiving devices (e.g., Web browsers) or "users" 10, 12, 14. A digital broadcast signal, e.g., representing some audio/video/multi-media content or program such as a radio program or television program, can be broadcast in encoded digital packets from the source server 60 to the receivers 10; 12, 14. Although the digital broadcast content is the same for each receiver, a separate communication stream, comprising separate digital data packets, is required for each receiver that is coupled to the Internet. Therefore, three separate communication streams 20, 21 and 22 are shown as being broadcast directly from server 60 onto the Internet 40. Stream 20 is identified and communicated for receiver 10, stream 21 is identified and communicated for receiver 12 and stream 22 is identified and communicated for receiver 14. Further, the users 10, 12, 14 have to visit the Web site providing the audio/video/multi-media content in order to establish the communication streams 20, 21 , 22.

As a result of the above, it is clear that the number of users (receivers) that can receive broadcast information on the Internet simultaneously from one server 60 is limited mainly by the connection speed of the connection between the server 60 and the Internet 40 because each stream 20, 21 , 22 consumes available bandwidth. For example, assuming it is desired to broadcast a radio program over the Internet to users, e.g., that visit the web site of the server 60 (Figure 1). Depending on the compression algorithm used, and on the number of users that want to listen to the program simultaneously, the server 60 needs to be connected to the Internet 40 with a speed of at least N x K bytes/s, where K is the bandwidth requirement for one user and N is the number of users able to listen to the program simultaneously. Assuming the server connection to the Internet 40 allows up to 1.5 Mbit/s bandwidth, the number of listeners will be limited to roughly 300 per server, assuming roughly 5Kbits/s bandwidth requirement per user.

Although this figure appears large, in reality the bandwidth of the connection hardware between the server 60 and the Internet 40 actually imparts a substantial limitation to the number of receivers that can simultaneously receive content from the server. While more sophisticated connections with higher bandwidths can be used, this substantially increases the costs associated with providing the content from the server 60 to the receivers 10, 12 and 14.

Accordingly, what is needed is a cost effective method of providing content to many users pseudo-simultaneously over the Internet. What is further needed is a method and system that is able to provide broadcast communication content to many users, pseudo simultaneously, without being limited to the bandwidth constraints of the server to Internet connection. The present invention provides such a solution.

SUMMARY OF THE DISCLOSURE

A method and system are described herein as an embodiment of the present invention for implementing an Internet radio device for receiving and/or transmitting audio information over the Internet. The Internet radio device can be implemented as a stand alone electronic radio device which is coupled to the Internet or the Internet radio device can be implemented as a software package operable on a host computer system which is coupled to the Internet. In either case, the Internet radio device does not require a browser for interfacing with other Internet transmitters ("Internet radio station transmitters"). The Internet radio includes a graphical user interface (GUI) with which a user can interface in order to receive audio radio programming from an Internet radio station transmitter. The radio device receives a list of Internet radio station transmitters that are registered with a chaincast manager (CCM), also coupled to the Internet. The GUI renders this list to the user. The user can sort or select from this list based on desired language, country, or station names. To hear a radio program, a user can select a station from this list. Data received by a radio device can be retransmitted in chaincast mode from the radio device to other radio devices that want to listen to the same radio program.

Using the chaincast broadcasting architecture, described below, a primary information transmitter (PIT) within the CMM manages the flow of digitally encoded audio information from the Internet radio station transmitters to and among the coupled Internet radio devices. Specifically, the CMM manages the communication links between the Internet radio station transmitters (e.g., primary broadcast servers) and the radio devices and manages the communication links between Internet radio stations performing chaincasting. In Ham radio mode, one radio device can select another radio device to be the "radio station," in which case a communication channel is opened between the radio devices so that voice and/or other digitally encoded information (e.g., video, HTML documents, Web pages, multi-media, etc.) can be exchanged between the radio devices. In this mode, the GUI contains a "transmit" button or key. Using the chaincast broadcasting architecture, described below, each radio device acts as a primary broadcast server to communicate information to an associated radio device. In Ham radio mode, a listing of radio devices can be shown in the radio GUI, in an analogous fashion as radio station listings are displayed. A user can then select a listed radio device with which to communicate.

A method and system is also described herein for a chaincast broadcasting architecture which performs chaincast communication to multiple communication systems within a system of coupled electronic devices. In one implementation the electronic devices can be computer systems and the system of coupled electronic devices includes the Internet. The present invention provides a system wherein a broadcast source communicates primary digital broadcast information (e.g., encoded audio radio content, encoded audio/video television content, etc.) to a first group of electronic devices. The first group of electronic devices can be instructed by a chaincast manager to then communicate (e.g., forward or re-transmit) the broadcast information to other electronic devices which devices can also be instructed to communicate to more devices, etc., thereby reducing the bandwidth requirements of the communication channel between the broadcast source and the first group of electronic devices. The communication is "chaincast" because the forwarding from one device to another, to another, etc., creates a logical communication "chain" originating from the broadcast server and traversing to and through the receiving devices. The resulting communication is pseudo-simultaneous with respect to the receiving devices due to the slight delay introduced in buffering and retransmitting the broadcast content from device to device, etc.

A computer implemented chaincast manager, coupled to the Internet, is used to track and manage which devices are forwarding broadcast information to which other devices. In order to ensure continuous data flow along the communication "chains," the chaincast manager is also used to monitor the packet rates between the electronic devices. In response to the packet rates falling below a pre-determined threshold value, the chaincast manager reroutes communications between the devices to provide better communication load sharing across the system and to provide more efficient content communication between the devices.

According to one embodiment of the present invention, the chaincast communication system may include a number of primary broadcast servers for broadcasting primary information content (e.g., radio programs, TV programs, multi-media content, etc.). The chaincast communication system may also include a number of secondary broadcast servers for broadcasting secondary information content (e.g., advertisement, emergency information, community information, etc.) to be rendered independently of the primary broadcast information content. Users of the electronic devices of the present chaincast communication system can select from one of these primary broadcast servers from which they desire to receive primary broadcast information. In one embodiment, the content of the secondary broadcast information the users receive is determined by the chaincast manager. In another embodiment, users of the present chaincast communication system can select a general subject matter that they desire to receive as the secondary broadcast information.

According to the present invention, an electronic device for re- transmitting or forwarding broadcast information may be a computer system configured for receiving and re-transmitting broadcast information to other electronic devices. The electronic device may include a re-transmission buffer for temporarily holding data packets received from an upstream device before rendering and for temporarily holding data packets after rendering for subsequent re-transmission to another electronic device. The electronic device also monitors a number of unrendered data packets stored therein. When the number of unrendered data packets falls below a threshold level, the electronic device signals the near empty condition to the chaincast manager such that a different upstream re-transmitter can be assigned to supply information to the electronic device.

Embodiments of the present invention include the above and further include a communication system comprising: a plurality of information receiver and retransmitter devices (IRRTs) coupled to the Internet wherein each IRRT is for receiving and rendering broadcast information and for selectively retransmitting the broadcast information to another IRRT; a plurality of primary broadcast servers coupled to the Internet, each for originating respective primary broadcast information that is chaincast among a group of IRRTs of said plurality of IRRTs; a plurality of secondary broadcast servers coupled to the Internet and each for originating respective secondary broadcast information that is chaincast among a group of IRRTs of the plurality of IRRTs; and a chaincast manager coupled to the Internet and for registering the plurality of primary and secondary broadcast servers and for scheduling information transfers of the respective primary broadcast information to IRRTs based on broadcast requests generated by the IRRTs to the chaincast manager.

A method and system are also described herein for implementing virtual receivers (e.g., virtual user devices) to optimize data flow within a chaincast communication system. In particular, a plurality of virtual user devices are coupled to the Internet via high bandwidth connections. The virtual user devices can be implemented at an Independent Service Provider(ISP), the ISP providing the high bandwidth connection. Also, the virtual user devices can be implemented to share a communication connection with the chaincast manager. Moreover, the virtual user devices can be implemented to share a communication connection with one or more of the plurality of broadcast servers. More importantly, the virtual user devices can be remotely controlled by the chaincast manager to connect to a particular broadcast server and to retransmit information from the broadcast server to one or more user devices. Each virtual user device can retransmit information to a larger number of user devices than the typical user device. This large fan-out bandwidth capability of the virtual user device is a consequence of the high bandwidth connection to the Internet provided to the virtual user device by the ISP or shared with the chaincast manager or the broadcast server. The present invention reduces the number of chain links (e.g., user device-to-user device) in a chaincast chain. Furthermore, virtual user devices provide the opportunity to multicast information from the broadcast servers without the expense of implementing IP multicast infrastructure, including expensive IP multicast routers. ln one aspect of the present invention, a communication system comprises a plurality of information receiver and retransmitter devices (IRRTs) coupled to the Internet, wherein each IRRT is for receiving broadcast information and for selectively retransmitting portions of said broadcast information to another IRRT, said plurality of IRRTs including: a plurality of virtual IRRTs, wherein each virtual IRRT is configured for remote control thereof, and a plurality of real IRRTs, wherein each real IRRT is controlled by a user; a plurality of primary broadcast servers coupled to said Internet, each for originating respective primary broadcast information that is chaincast among a group of IRRTs of said plurality of IRRTs; and a chaincast manager coupled to said Internet and for registering said plurality of primary broadcast servers and for scheduling information transfers of said respective primary broadcast information to IRRTs based on broadcast requests generated by said IRRTs to said chaincast manager, wherein said chaincast manager is configured to remotely control each virtual IRRT.

In another aspect of the present invention, a method of optimizing communication of broadcast information over the Internet comprises the steps of a) monitoring a plurality of chaincast communication connections between a primary server and a plurality of user devices, wherein said primary server and said plurality of user devices are coupled to the Internet, and wherein said plurality of user devices includes a plurality of virtual user devices each configured for remote control thereof and a plurality of real user devices each configured for control by a user, further wherein said primary server communicates primary broadcast information via the plurality of chaincast communication connections; b) before establishing a new chaincast communication connection between said primary server and an unconnected user device, determining whether to establish a first chaincast communication connection between said primary server and one of said plurality of virtual user devices in accordance with a plurality of chain link criteria; and c) establishing said new chaincast communication connection in accordance with said plurality of chain link criteria. ,

In accordance with the present invention, a server with chaincast capability is accessed by multiple user devices, each seeking to retrieve identical information from the server. Rather than create a separate source- destination path for each of the user devices, the server activates chaincast capability within each of the user devices. Thus, a chaincast manager provides each of the user devices with a connection to retrieve the information from the server, where the connection can be a chaincast connection with another user device or a direct connection to the server. If any one of the user devices loses its connection prior to retrieving all of the information, the user device communicates with the chaincast manager to request another connection to complete retrieval of the information. Due to the present invention, the server experiences a marked reduction in bandwidth bottleneck problems without the implementation of an expensive high bandwidth Internet infrastructure.

In yet another aspect of the present invention, a method of communicating information over the Internet comprises the steps of: a) selecting first information stored in a chaincast enabled server for communicating to a first user device; b) causing said first user device to transmit first registration information to a chaincast manager; c) causing said chaincast enabled server to establish a first connection with the first user device and to communicate said information to said first user device as instructed by the chaincast manager; d) selecting said-first information stored in said chaincast enabled server for communicating to a second user device; e) causing said second user device to transmit second registration information to said chaincast manager; f) determining where to connect said second user device such that to communicate said first information to said second user device in accordance with a plurality of chain link criteria; and g) establishing a second connection as determined by step f) for said second user.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 illustrates a prior art information broadcast system using the Internet.

Figure 2 illustrates a general purpose computer system which can be used as an electronic device, a user, or a server in accordance with the present invention.

Figure 3A is an exemplary communication diagram of the chaincast communication method of the present invention.

Figure 3B is another exemplary communication diagram of the chaincast communication method of the present invention.

Figure 3C is another exemplary communication diagram of the chaincast communication method of the present invention.

Figure 4 is an Internet connection diagram of the devices of Figure 3A. Figure 5A illustrates a name table managed by the transmission scheduler for the user devices of the present invention.

Figure 5B illustrates a name table managed by the transmission scheduler for information transmitters of the present invention.

Figure 6 is a flow chart diagram illustrating steps of the chaincast communication method of the present invention.

Figure 7 is a flow chart diagram illustrating steps of the chaincast communication method of the present invention.

Figure 8A is an exemplary communication diagram of the chaincast communication method according to one embodiment of the present invention.

Figure 8B is another exemplary communication diagram of the chaincast communication method according to one embodiment of the present invention.

Figure 9 is an exemplary user interface of a software-implemented Internet radio software with chaincasting capability according to the present invention.

Figure 10 is a logical block diagram illustrating a transmission buffer according to one embodiment of the present invention. Figure 11 is a graphical user interface of a radio device in accordance with one embodiment of the present invention for Ham radio mode.

Figure 12A is a logical block diagram of the chaincasting communication architecture for Ham radio mode communications between radio devices of one embodiment of the present invention.

Figure 12B illustrates a chaincast communication configuration for the secondary broadcast servers which can operate in parallel with the transmissions of the primary broadcast servers of Figure 12A.

Figure 13 is an exemplary configuration a chaincast communication system according to yet another embodiment of the present invention.

Figure 14 is a flow chart diagram illustration operations of the chaincast communication system illustrated in Figure 13 in furtherance of one embodiment of the present invention.

Figure 15 is an exemplary Internet connection diagram of the chaincast communication system according to one embodiment of the present invention, illustrating the virtual user device.

Figure 16 is an exemplary communication diagram of the chaincast communication system according to one embodiment of the present invention, illustrating the virtual user device and multicasting. Figure 17 is a flow chart diagram illustrating operations of the chaincast communication system illustrated in Figure 15 in furtherance of one embodiment of the present invention.

Figure 18 is a flow chart diagram illustrating operations of the - chaincast communication system illustrated in Figures 15 in furtherance of another embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

In the following detailed description of the present invention, a chaincast system and method, including an Internet radio device, for communicating digital broadcast content to multiple users, pseudo simultaneously, without being constrained to the bandwidth of the server-to- internet connection, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be recognized by one skilled in the art that the present invention may be practiced without these specific details or with equivalents thereof. In other instances, well known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the present invention.

NOTATION AND NOMENCLATURE Some portions of the detailed descriptions which follow are presented in terms of procedures, steps, logic blocks, processing, and other symbolic representations of operations on data bits within a computer memory. These descriptions and representations are the means used by those skilled in the data processing arts to most effectively convey the substance of their work to others skilled in the art. A procedure, computer executed step, logic block, process, etc., is here, and generally, conceived to be a self-consistent sequence of steps or instructions leading to a desired result. The steps are those requiring physical manipulations of physical quantities. Usually, though not necessarily, these quantities take the form of electrical or magnetic signals capable of being stored, transferred, combined, compared, and otherwise manipulated in a computer system. It has proven convenient at times, principally for reasons of common usage, to refer to these signals as bits, values, elements, symbols, characters, terms, numbers, or the like.

It should be borne in mind, however, that all of these and similar terms are to be associated with the appropriate physical quantities and are-merely convenient labels applied to these quantities. Unless specifically stated otherwise as apparent from the following discussions, it is appreciated that throughout the present invention, discussions utilizing terms such as "processing" or "computing" or "translating" or "calculating" or "determining" or "displaying" or "recognizing" or the like, refer to the action and processes of a computer system, or similar electronic computing device, that manipulates and transforms data represented as physical (electronic) quantities within the computer system's registers and memories into other data similarly represented as physical quantities within the computer system memories or registers or other such information storage, transmission or display devices.

COMPUTER SYSTEM 112 Aspects of the present invention, described below, are discussed in terms of steps executed on a computer system. Aspects of the present invention are also discussed with respect to an Internet system including electronic devices and servers coupled together within the Internet platform. A "server" and an "electronic device" or "user" can be implemented as a general purpose computer system. Although a variety of different computer systems can be used with the present invention, an exemplary computer system 112 is shown in Figure 2. , In general, computer systems 112 that can be used by the present invention comprise an address/data bus 100 for communicating information, a central processor 101 coupled with the bus for processing information and instructions, a volatile memory 102 (e.g., random access memory) coupled with the bus 100 for storing information and instructions for the central processor 101 and a non-volatile memory 103 (e.g., read only memory) coupled with the bus 100 for storing static information and instructions for the processor 101. Computer system 112 also includes a data storage device 104 ("disk subsystem") such as a magnetic or optical disk and disk drive coupled with the bus 100 for storing information and instructions and a display device 105 coupled to the bus 100 for displaying information to the computer user.

Also included in computer system 112 is an alphanumeric input device 106 including alphanumeric and function keys coupled to the bus 100 for communicating information and command selections to the central processor 101. Generally, alphanumeric input device 106 is called a keyboard or keypad. System 112 also includes a cursor control or directing device 107 coupled to the bus for communicating user input information and command selections to the central processor 101. The cursor directing device 107 is typically displaced through user movement which causes a cursor image displayed on screen 105 to move accordingly. Within the context of the present invention, the cursor directing device 107 can include a number of implementations including a mouse device, for example, a trackball device, a joystick, a finger pad (track pad), an electronic stylus, an optical beam directing device with optical receiver pad, an optical tracking device able to track the movement of a user's finger, etc., or any other device having a , primary purpose of moving a displayed cursor across a display screen based on user displacements. Computer system 112 also includes a microphone 109 for receiving voice inputs.

Computer system 112 of Figure 2 can also include an optional signal generating device 108 coupled to the bus 100 for interfacing with other networked computer systems, e.g., over the Internet. The display device 105 of Figure 2 utilized with the computer system 112 of the present invention may be a liquid crystal device, other flat panel display, cathode ray tube, or other display device suitable for creating graphic images and alphanumeric characters recognizable to the user. In one embodiment of the present invention, computer system 112 could be a Windows Operating System based computer system having an x86 architecture processor 101 , or an Apple Operating System based Macintosh computer, for example.

CHAINCAST COMMUNICATION OF THE PRESENT INVENTION Figure 3A illustrates an exemplary configuration in accordance with the present invention for performing "chaincast" communication within the Internet system. Within Figure 3A, a broadcast server 260 supplies a broadcast content that a number of electronic devices a1-aj, b1-bk, d and c2 (coupled to the Internet) desire to receive "pseudo" simultaneously. This broadcast content can be of any nature or character that would be desired to be received by a number of users simultaneously, e.g., an encoded audio program (e.g., a radio program), an encoded audio/visual program (e.g., a television program), an instructional seminar, a software program, an HTML document, multimedia content, etc. The broadcast content is typically encoded into individual data packets and broadcast digitally. The digital broadcast content is received pseudo-simultaneously because of the small latencies involved in buffering and retransmitting the broadcast content between various electronic devices of Figure 3A.

The chaincasting method of the present invention does not require a high speed connection between the broadcast server 260 and the Internet 300 (Figure 4) and still allows practically an unlimited number of users to receive and render the same digitally broadcasted program. The chaincasting method can be applied to any kind of information broadcasting, including radio and television (TV), Web-content and other information. For simplicity, a radio program is described herein as an example of broadcast content. However, it should be appreciated that audio/visual and/or other multimedia content could also be used as the digital broadcast.

The present invention, instead of transmitting the information to many users directly from a server, causes the server to transmit the information directly only to a few users (e.g., a1-aj of Figure 3A) and then instructs these few users to forward (or "retransmit" or "relay") the information to the other users (e.g., b1-bk, d and c2) as needed. This is chaincasting. The present invention changes the paradigm of information providers and information consumers because all users can relay information to others thereby reducing the communication burden on the server-to-internet connection. Instead of the old paradigm, the present invention creates an information sharing community (Figure 3A) that utilizes the Internet resources optimally. Chaincasting causes a logical chain of the same broadcast signal from the broadcast server 260 to other electronic devices and then to other electronic devices, etc.

In the example of Figure 3A, users a1-aj receive the broadcast content directly from the broadcast server 260 via separate information streams 310- 313, which are supported on the bandwidth resources of the connection hardware situated between the Internet 300 (Figure 4) and server 260. These streams each contain digital encoded packets that make up the digital broadcast content. In one example, the broadcast content represents a radio program and is therefore digital encoded audio information. The number of users, j, is set based on the bandwidth supported by the connection hardware located between the Internet 300 (Figure 4) and server 260. Users a1-aj are instructed, by the computer-implemented transmission scheduler 200, to respectively forward the broadcast content to users b1 -bk in the fashion shown in Figure 3A. For instance, a separate stream 320 is used between users a1 and b1 ; a separate stream 324 is used between users a2 and b2; a separate stream 326 is used between users a3 and b3; and a separate stream 330 is used between users aj and bk. Users b1 and b3 are instructed, by the transmission scheduler 200, to forward again the broadcast content to users d and c2 in the fashion shown in Figure 3A. A separate stream 322 is used between users b1 and d and a separate stream 328 is used between users b3 and c2.

Logical communication "chains" are formed in this communication architecture, e.g., chainl is a1-b1-d ; chain2 is a2-b2; chain3 is a3-b3-c2 and chain4 is aj-bk. Software loaded within each user can be used to provide the forwarding functionality which is controlled by the transmission scheduler 200.

Each user of Figure 3A, registers with the transmission scheduler 200 which maintains and tracks the communication links established between the users. The transmission scheduler 200 load balances between the users so that the communication load is balanced to reduce transmission latencies. Load balancing can be performed to maintain uniform chain sizes. For example, if one user is supplying retransmissions to a relatively larger number of other users (e.g., a chain size of four), then some of the receiver users can be moved from this chain such that they receive the information from other established chains. It is possible for one user to receive broadcast information from more than one other user; the duplicate data can be ignored.

In the chaincast communication architecture, all users send status update messages to the transmission scheduler 200. Transmission scheduler 200 can use these status update messages to re-route communication links when the transmission activity of one user becomes too slow; or shuts down. For instance, assume user b3 of Figure 3A shuts down. The result is shown in Figure 3B where the transmission scheduler 200 created a new link 340 to directly connect user a3 to user c2. The transmission scheduler 200 creates and maintains the new link 340 (as well as all other links). Assuming rendering pipelines are large enough within each user, the transfer or reassignment between communication sources from Figure 3A to Figure 3B (with respect to user c2) can be performed transparently to user c2. As another example, assume user b3 of Figure 3A decides to download a large software program from the Internet, consuming a substantial portion of his bandwidth. In this case, user c2 begins to receive broadcast data at a rate that is too slow based on a predetermined threshold. User c2 reports this in a periodic message to the transmission scheduler 200. The transmission scheduler 200 then reassigns the source for user c2. The resulting re-transmission pathways are illustrated in Figure 3C when the transmission scheduler 200 created a new link 340 to directly connect user a3 to user c2 while maintaining the link 326 between user a3 and user b3. The detailed mechanisms for detecting a slow or dead link between users in accordance with one embodiment of the present invention are described herein to follow.

Figure 4 is a high level diagram of the Internet connection system of the devices of Figure 3A. The users, a1-aj, b1-bk, d and c2 are coupled to the Internet 300. The broadcast server 260 and the transmission scheduler 200 are coupled to the Internet. Server 260 and scheduler 200 can reside in separate computer systems or can reside within the same computer system. Internet connection 202 is located between the broadcast server 200 and the Internet 300 and has a finite communication bandwidth that dictates the number of users a1-aj that can directly receive broadcast information packets from the server 260.

Figure 5A illustrates that the transmission scheduler 200 can be coupled with a name server 400 that contains a listing of IP addresses 412 for each user and each user has an associated unique name (column 410). This name server 400 can be used to establish communication links (e.g., to support Internet telephony) between users. If a first user wants to talk to a second user, the first user informs transmission scheduler 200 of the communication link between itself and name of the second user. The transmission scheduler 200 then opens a direct link between the first and second users, over the Internet 300. For example, links 320, 322, 324, 326, 328, 330 shown in Figure 3A can be opened using the name server in this fashion, but the establishment of these links and the designation of users are controlled by the transmission scheduler 200.

Name server 400 also contains user information (e.g., name, address, phone number, etc.) of each user (column 414). In addition, name server 400 includes a listing of the status information (column 416) of the user devices associated with each of the users, a listing of the sources (column 420) from which the user devices receive broadcast content, and a listing of the targets (column 422) to which the user devices relay broadcast content. The status information (column 416) is used by the transmission scheduler 200 to determine the availability of a particular user device for relaying broadcast content. Name server 400 further includes geographical location information (column 418).

Figure 5B illustrates that transmission scheduler 200 can be coupled with a name server 430 that contains a listing of IP addresses 434 for each information transmitter (e.g., broadcast server 260) and each information transmitter has an associated unique station name (column 436). The station name may be the name of the radio station or TV station that the information transmitter carries. This name server 430 is used to establish communication links (e.g., to support Internet telephony) between information transmitters and

— \ i the users. If a user wants to receive broadcast information from an information transmitter, the user informs transmission scheduler 200 of the name of the information transmitter or a station name. The transmission scheduler 200 then opens a direct link between the information transmitter and the user over the Internet 300. For example, links 310, 311, 312, 313 shown in Figure -3A, Figure 3B and Figure 3C can be opened using the name server in this fashion, but the establishment of these links and the designation of users are controlled by the transmission scheduler 200.

Name server 430 also contains registration information (e.g., maximum number of user devices permitted, etc.) of each information transmitter (column 438). In addition, name server 430 includes a listing of the targets (column 446) to which the information transmitters transmit broadcast content. A listing of the geographical location of the information transmitters (column 440), a listing of the language in which the broadcast is made (column 442) and a listing of the status of the information receivers (column 444) are also included in name server 430. It should be appreciated that the transmission scheduler 432 and the name server 430 of the present embodiment may be implemented within a primary broadcast server for chaincasting primary content and within a secondary broadcast server for chaincasting second content. Primary and secondary broadcast servers will be discussed in greater details further below.

SCHEDULING OPERATIONS AND METHOD FOR MAINTAINING CONTINUOUS DATA FLOW WITHIN A CHAINCAST COMMUNICATION SYSTEM

An example is given to illustrate the scheduling operations and the method for maintaining continuous data flow within a chaincast communication _system of the present invention. In the following example, the chaincast communication system of the present invention includes one or more broadcast servers, a chaincast server and a number of information receivers and retransmitters (IRRTs). On a broadcast server (e.g., broadcast server 260) is

5 placed software that is operating as a multi-channel information transmitter. Individual broadcast servers may be operated by content providers (e.g., radio stations, television stations, or other multi-media content providers) for providing information on the Internet. On the chaincast server (or another broadcast server) is placed software that is operating as: 1) a chaincast manager (CCM);

I0 2) a name server; and 3) transmission scheduler (e.g., transmission scheduler 200). The CCM functions to coordinate and supervise the operations of the name server and the transmission scheduler. In the present embodiment, each IRRT includes a computer system (analogous to computer system 112) and has an information rendering process, e.g., a radio software program ("Internet

15 radio"), operating that allows broadcast digital packets to be decoded to thereby render a perceptible image and/or an audible sound, e.g., a radio program, originated by the multi-channel information transmitter.

Figure 6 is a flow chart diagram illustrating the scheduling operations of .0 the chaincast communication system according to an embodiment of the present invention. As illustrated, at step 605, when an information transmitter is activated, it will register itself with the chaincast manager (CCM), and will inform the CCM the identity of the broadcast information source (e.g., a radio station). According to one embodiment of the present invention, an information 5 transmitter is responsible for chaincasting information from only one broadcast information source. However, in the present embodiment, a broadcast server may include multiple information transmitters. Therefore, a broadcast server may be used .to chaincast information originated from multiple information sources.

At step 607, the information transmitter digitizes broadcast information from the information source into data packets and adds an identifier to each of the data packets. The identifier, according to the present embodiment, is a time stamp indicating the time a data packet is created. The broadcast information, however, is not immediately forwarded or re-transmitted to an IRRT. Rather, the broadcast information is temporarily stored within a transmission buffer of the broadcast server. In the present embodiment, broadcast information is continuously received by the information transmitter. Thus, old data packets stored within the transmission buffer are continuously discarded to make room for new data packets. Further, the transmission buffer includes a buffer forward (TBF) portion for storing data packets that are not yet transmitted, and a buffer past (TBP) portion for storing data packets that have already been transmitted.

Referring again to Figure 6, at step 610, when a user (e.g., user A) wants to receive chaincast information, he/she will turn on or activate an information receiver and re-transmitter (e.g., IRRT-x) which will connect to the CCM and will inform the CCM about its IP address. IRRT-x will then receive from the CCM a list of available information transmitters that are registered with the CCM. Within the present embodiment, IRRT-x presents the list to user A such that user A can select the broadcast information that he/she wants to receive. The list may include alphanumeric representations of names of the radio stations, TV stations, etc., carried by the information transmitters that are available to the user. The list may also include alphanumeric representations of languages of the radio stations that are available. At step 615 of Figure 6, user A then selects an information transmitter and IRRT-x will send this information to the CCM. The IRRT-x is now "tuned" to the selected information transmitter.

At step 620, after the CCM receives the information regarding the selected information transmitter from IRRT-x, the CCM then decides whether IRRT-x will receive time-stamped data packets directly from the selected information transmitter, or whether IRRT-x will receive time-stamped data packets from another IRRT which is already tuned to the selected information transmitter.

At step 622, if it is determined that no other IRRTs are suitable for relaying the time-stamped data packets, CCM will instruct the selected information transmitter to begin transmitting time-stamped data packets to this IP address (the IP address of IRRT-x).

At step 623, if an IRRT (IRRT-y) that is already tuned to the same information transmitter is available and has sufficieint bandwidth, the CCM will instruct IRRT-y to relay the time-stamped data packets to IRRT-x according to the chaincast approach as discussed above (Figure 3A, Figure 3B and Figure 3C).

At step 625, IRRT-x receives time-stamped data packets from the information transmitter and begins to render the time-stamped data packets. At the same time, IRRT-x will store data packets to be rendered in its transmission buffer. According to one embodiment, data packets that have been rendered will not be immediately discarded. Rather, rendered packets will be temporarily stored in the transmission buffer for subsequent re-transmission to another IRRT.

At step 625, as the information stored in the transmission buffer of IRRT-x is rendered and as the transmission buffer is draining, IRRT-x generates requests to its chaincast source (e.g., the information transmitter or another IRRT) to download more data. Particularly, in the present embodiment, IRRT-x is configured to generate a request as the transmission buffer is draining past a "Buffer Low" level. The requests generated by IRRT-x may also include a time stamp of the last data packet received by IRRT-x such that its source may begin transmission with the next data packet.

In this manner, a user of the chaincast communication system of the present invention will receive the data either directly from the server, over the Internet, or from another user that is already receiving the information (in the chaincast mode). The new user can then later be asked to provide, e.g., forward broadcast information to another user.

^" According to one embodiment of the present invention, the transmission buffer of IRRT-x includes a forward buffer (TBF) for storing data packets to be rendered and a past buffer (TBP) for storing data packets that have already been rendered. Further, TBF and TBP are both capable of storing data packets for at least 60 seconds of broadcast information. The packet transmission speed is higher than the rendering speed. Therefore, if the connection remains stable, the TBF buffer will be close to full all the time. Thus, in the event that the connection between the information transmitter and IRRT-x becomes unstable, the users will not experience "gaps" in the broadcast information. Problems associated with fluctuations in packet rate are also avoided. The TBP, on the other hand, stores data packets that have already been rendered but may be required for subsequent transmission to a downstream IRRT.

An exemplary transmission buffer 1000 of an IRRT 1001 is illustrated in

Figure 10. As illustrated, transmission buffer 1000 is partitioned by a rendering pointer 1030 into two portions: a buffer forward (TBF) 1010 for storing the information to be rendered and buffer past (TBP) 1020 for storing the information that has already been rendered. Rendering pointer 1030 is pointing to the specific data packet(s) that is currently rendered. The transmission buffer 1000 is configured for receiving and storing time-stamped data packets from a chaincast source (e.g., information transmitter or an upstream IRRT). It is important to note that the time stamps are also received from the chaincast source. Also illustrated in Figure 10 is a "near empty" pointer 1040 and a "buffer low" pointer 1050. According to the present invention, if the number of data packets falls below the "buffer low" pointer 1050, IRRT 1001 will signal its chaincast source to send more data packets. If the number of data packets falls below the "near empty" pointer 1040, IRRT 1001 will signal the CCM to assign another chaincast source for the IRRT 1001. In this way, the transmission buffer 1000 will be maintained at full level such that problems with fluctuations in data packet rate are minimized. As data packets are rendered, they are pushed into the TBP 1020 for subsequent re-transmission to another IRRT, while data packets pushed out from the bottom of TBP 1020 are either discarded or moved to a storage device.

In order to maintain continuous data flow along the communication "chains," it is important to monitor the packet rates between the IRRTs. In response to the buffer content level falling below a pre-determined threshold value, the present invention re-routes communications between the user devices to provide better communication load sharing across the system. According to the present invention, the transmission buffers of the IRRTs are used to monitor the packet rates. Particularly, each IRRT monitors a-number of unrendered data packets stored within its own transmission buffers. When the number of unrendered data packets falls below a threshold level, the IRRT signals its near-empty condition to the CCM such that a different upstream IRRT can be assigned to it.

Figure 7 is a flow chart diagram illustrating steps of re-routing communications within the chaincast communication system of the present invention. In the present example, for the purpose of illustration, it is assumed that the connection between an IRRT-b and its upstream IRRT-a becomes very slow. This may be caused by the IRRT-a shutting down or other reasons. Thus, at step 710, the lowered packet rate causes the number of unrendered data packets stored within the transmission buffers of the IRRT-b to drop below a predetermined threshold (e.g., "Nearly Empty" threshold 1040), and triggers it to send a signal indicating the buffer's near empty condition to the CCM. In addition, at step 710, IRRT-b sends to the CCM the time-stamp of the last data packet that it received.

Then, at step 720, the CCM selects another information receiver and retransmitter (IRRT-c) which is tuned to the same information transmitter to relay the broadcast information to IRRT-b. If no other IRRTs are available, then the CCM selects the information transmitter to broadcast directly to IRRT-b. At step .730, after IRRT-c (or the information transmitter) is selected, it is instructed by the CCM to forward the data packets to IRRT-b starting with the packet indicated by the time stamp. Sometimes, IRRT-c may no longer have the desired data packets. In that case, IRRT-c will begin transmitting the last data packet contained in its TBP, and some broadcast information will be lost.

However, a small amount data loss is acceptable for broadcast content such as a radio program. In other cases where direct transmission is not feasible and where no other IRRTs are tuned to the same information transmitter, the CCM may use an IRRT that is in a "stand by" mode or that is tuned to a different station to relay the broadcast information.

PRIMARY AND SECONDARY INFORMATION TRANSMITTERS Figure 8A is another exemplary chaincast communication system 800 according to an embodiment of the present invention. Within Figure 8, a primary broadcast server 860a supplies broadcast content to a communication chain 810 consisting of information receiver and re-transmitters IRRT1-IRRT6. Another primary broadcast server 860b chaincasts broadcast content to another communication chain 820 consisting of information receiver and re-transmitters IRRT7-IRRT11. Yet another primary broadcast server 860c chaincasts broadcast content to communication chain 830 consisting of information receiver and re-transmitters IRRT12 and IRRT13. Primary broadcast servers 860a-860c are also called primary information transmitters (PITs). Secondary broadcast servers 870a-870c supply supplemental content to the information receiver and re-transmitters IRRT1-IRRT13. In the present embodiment, information receiver and re-transmitters IRRT1-IRRT13 each consists of a computer system running software that is configured for receiving and retransmitting primary and secondary content to another user device as instructed by a primary information transmission scheduler (PITS) 855 and a secondary information transmission scheduler (SITS) 857 of chaincast manager (CCM) 850.

Significantly, according to the present invention, the primary broadcast servers 860a-860c are configured for chaincasting primary content that is originated from a radio broadcaster, a TV broadcaster or other multi-media content provider, and the secondary broadcast servers 870a-870c are for chaincasting secondary or supplementary content that may not be originated from radio broadcasters, TV broadcasters or multi-media content providers.

Secondary broadcast servers 870a-870c are also called secondary information transmitters (SITs). Typically, the primary broadcast servers 860a-860c can be operated by the information source companies (e.g., radio stations, TV networks) and the secondary broadcast servers 870a-870c (e.g., responsible for transmitting advertising content) can be operated by Internet service providers or ChainCast, Inc. of California, under the control of the secondary information transmission scheduler (SITS) 857 of CCM 850. In the present embodiment, the SITS coordinates the chaincasting of the secondary information in a similar manner that the primary broadcast information is chaincasted.

As an example, the primary content may be a radio program broadcast by BBC of Great Britain. The secondary content, on the other hand, may be weather information of the location of the user. As another example, the secondary content may be real-time stock quotes. According to one embodiment of the present invention, the secondary information may be rendered in the background while the primary content (e.g., radio program from BBC) is rendered at a louder volume in the foreground. The secondary content may also be inserted in between the primary content. The secondary broadcast servers 870a-870c may also provide emergency broadcast information such as earthquake and flood warnings. It should be appreciated that only a few exemplary uses of the secondary broadcast servers 870a-870c ar& described herein and that the secondary broadcast servers 870a-870c may be used to supply all kinds of information to the information receiver and re-transmitters IRRT1-IRRT13. It should be noted that the secondary information may be audio or visual or any other types of multi-media information.

According to one embodiment of the present invention, the CCM 850 is responsible for providing a list of secondary content categories to the users. The users will then be able to select a particular category of secondary content that they would like to receive. The secondary information transmitter scheduler (SITS) 857, based on the user-inputs, will then select the appropriate secondary information transmitters (SITs) to provide secondary content pertinent to the selected category to the users. As an example, if a user selects a secondary content category for "automobiles," the SITs will choose an SIT carrying automobile-related advertisement to chaincast the advertisement to the user. It should be noted that the secondary content in this case ("automobiles") can be completely independent of the primary content that the user is receiving. In this way, locally relevant information may be provided to a user even though the user is tuned to a remote information broadcaster.

- It should also be noted that secondary information does not have to be transmitted along the same communication chains defined by the primary information transmitter scheduler. In order words, the SITS does not have to use the same, communication chains defined by the PITS to relay secondary information. Indeed, the communication topology for the secondary information can be significantly different from the communication topology for the primary information. Figure 8B illustrates a configuration of the communication chains 880a-880d of the chaincast communication system 800 of Figure 8. As illustrated, secondary information are transmitted along communication chains 880a-880d to IRRT1-IRRT13. However, the composition of communication chains 880a-880d is entirely different form the composition of the communication chains 810, 820 and 830 of Figure 8.

METHOD AND SYSTEM FOR CHAINCASTING WEB-CONTENT IN ACCORDANCE WITH THE PRESENT INVENTION The chaincast paradigm in accordance with the present invention is not only applicable to radio broadcast and TV broadcast, but is applicable to Web- content, such as HTML-based Web-content, as well. Figure 13 illustrates a chaincast communication system 1300 for performing the chaincast communication method according to an embodiment of the present invention. Within Figure 13, a Web server 1360 supplies Web content to a communication chains 1310, 1311 and 1312. Communication chain 1310 includes Web clients 1370a-1370d, communication chain 1311 includes Web clients 1370e-1370h, and communication chain 1312 includes Web clients 1370i-1370j. According to the present embodiment each of the Web clients 1370a-1370j is a computer system (e.g., computer system 112) operating a Web browser software. Further, in the present embodiment, the browser software includes a software module ("chaincast plug-in") 1380. ln the present embodiment, the "chaincast plug-in" module 1380 is configured for relaying Web-content from one Web-client to another as instructed by a chaincast manager (CCM) 850. In the example illustrated in Figure 13, Web-client 1370a receives Web-content directly from the Web server 1360 via information stream 1310. Web client 1370a includes chaincast plug-in 1380 configured for retransmitting Web-content that it received from Web server 1360 to Web-clients 1370b and 1370d under the instructions from CCM 850. Web-clients 1370b and 1370d, in turn, relay the web-content information it received to other Web-clients including web-client 1370c. Web-content is also disseminated in a similar fashion along communication chains 1311 and 1312.

Figure 14 is a flow diagram illustrating exemplary operations of the chaincast communication system 1300 in accordance with one embodiment of the present invention. As illustrated, at step 1410, when a Web-client (Web- client X) is activated, its chaincast plug-in module 1380 registers the Web-client with the CCM 850. According to the present invention, step 1410 may include the steps of modifying a name server (e.g., name server 400) by adding an IP address and a name ID corresponding to the Web-client X.

At step 1420, user of the Web-client X attempts to access a Web-page indicated by an URL. The chaincast plug-in module of Web-client X then automatically sends the URL to the CCM 850.

At step 1440, upon receiving the URL, the CCM 850 determines whether the Web-page indicated by the URL has been recently accessed by or is currently being accessed by another Web-client. CCM 850 may also determine the content of the cache memories of the Web-clients which have recently accessed the same URL.

At step 1450, if it is determined that another Web-client (Web-client Y) has recently accessed the same URL and possesses all the content of the URL in its cache memory, or if it is determined that Web-client Y is currently accessing the same URL, the CCM 850 will direct the Web-client Y to relay the content of the web-page to the Web-client X. In another embodiment of the present invention, the source client (Web-client Y) does not have to possess all the content of the URL in its cache memory. In that embodiment, CCM 850 will instruct Web-client Y to selectively forward information stored in its cache memory that is related to the URL to Web-client X.

However, at step 1460, if it is determined that no other Web-clients are accessing the same web-page, the CCM 850 will then communicate the URL the Web-server corresponding to the URL, and the requested web-page will then be transmitted directly to Web-client X. In this manner, a Web server would able to provide "pseudo" simultaneous access to a virtually unlimited number of people despite a limited connection bandwidth with the Internet.

GRAPHICAL USER INTERFACE OF AN INTERNET RADIO WITH CHAINCASTING CAPABILITY ACCORDING TO THE PRESENT INVENTION According to one embodiment of the present invention, an IRRT can be implemented as a stand alone electronic radio device which is coupled to the

J ; Internet or the IRRT can be implemented as a software package operable on a host computer system which is coupled to the Internet. In either case, the Internet radio device does not require a browser for interfacing with other Internet transmitters ("Internet radio station transmitters"). The Internet radio includes a graphical user interface (GUI) with which a user can interface in order to receive audio radio programming from an Internet radio station transmitter. The radio device receives a list of Internet radio station transmitters that are registered with a chaincast manager (CCM), also coupled to the

Internet. The GUI renders this list to the user. The user can sort or select from this list based on desired language, country, or station names. To hear a radio program, a user can select a station from this list. Data received by a radio device can be retransmitted in chaincast mode from the radio device to other radio devices that want to listen to the same radio program.

Figure 9 is an exemplary graphical user interface (GUI) 900 of a software Internet radio device with chaincasting capability according to the present invention. Using the GUI 900, a user can select radio programs that are chaincasted by primary broadcast server of the present invention. As illustrated, GUI 900 includes a window for displaying an image 910 resembling a real radio. Image 910 includes a display region 920 for displaying a preprogrammed channel number, the country of origin of the selected radio program and the name of the selected radio broadcaster. In the illustrated embodiment, BBC of Great Britain corresponding to pre-programmed channel number 5 is displayed in region 920.

GUI 900 further includes channel scanning buttons 930 that are responsive to user inputs. In the one embodiment, when the channel scanning buttons 930 are "clicked" by the user, the IRRT will signal the CCM that a different radio program is selected. The CCM will then instruct a PIT or another IRRT carrying data packets corresponding to the newly selected radio program , to forward the.data packets to the IRRT. GUI 900 further includes a volume control button 940 responsive to user inputs for adjusting the rendering volume. GUI 900 further provides a number of channel programming buttons 950a-950f configurable for selecting a pre-programmed radio broadcaster. For example, if a user configures the button 950e to correspond to a particular radio-station, the IRRT will send a signal to the CCM indicating the station selected, and the CCM will instruct a PIT or another IRRT carrying that particular station to forward data packets to the IRRT.

GUI 900 further includes a tool bar 970 through which the user may access a list of available radio stations. In the illustrated embodiment, the radio stations are sorted by country names, languages and station names such that a user can select a radio station according to its country, language, or station name.

HAM RADIO MODE COMMUNICATIONS USING THE INTERNET RADIO DEVICE Figure 11 illustrates a graphical user interface (GUI) 1120 used by an alternate embodiment of the Internet radio device of the present invention. In this embodiment, called Ham radio mode, one Internet radio device is allowed to communicate (e.g., transmit information to and receive information from) with another Internet radio device. The GUI 1120 used in this embodiment is similar to the GUI 900 of Figure 9 except as described differently herein.

GUI 1120 contains a display region 1110 in which a listing of registered radio devices can be displayed according to a selection criterion as set by user- controlled control bar 1150. Within control bar 1150, the user can select to , display all radio devices by their registered country, language or name, etc. After the selection is made, all registered radio devices (e.g., registered with the CMM 850) fitting that selection are displayed in list form in display region 1150. The user can then select one of those listed radio devices, using up and down scroll keys 940 to scroll through the listing. The radio device running the GUI 1150 can then communicate with the selected other radio device once a particular radio device from the listing is selected. The information (e.g., audio signals) transmitted via the Internet from the selected other radio device can be received and rendered audible on the radio device running the GUI 1150. Also, a transmit key 1105 can be used on the radio device running the GUI 1150 to communicate audio signals to the selected other radio device via the Internet. When transmitting audio signals, the microphone 109 (Figure 2) is used to capture the user's voice and the radio device then digitizes and encodes the audio signals for transmission over the Internet.

In the exemplary GUI 1150 of Figure 11 , the selected radio device is called "USER_NAME" and its country is GBR. Although not shown, its language could be "English." A radio device can register with more than one language.

Figure 12A illustrates a block diagram of the chaincast broadcast architecture in one embodiment of the present invention for supporting Ham radio broadcasting modes, as described with respect to Figure 11. In this configuration, a first radio device (called "user 1") is treated as a primary broadcast server 1210b arid communicates with another, second radio device, 1220a which acts as an IRRT device to receive signals broadcast over the

Internet from the first radio device 1210b. The first radio device 1210b registers with the PITS 855 of the CMM 850 in the fashion described above. Also in this configuration, the second radio device (called "user 2") is also treated as a primary broadcast server 1220b and communicates with the first radio device, 1210a which acts as an IRRT device to receive signals broadcast over the Internet from the second radio device 1220b. The second radio device 1220b registers with the PITS 855 of the CMM 850 in the fashion described- above.

It is appreciated that element 1210a and element 1210b are the same device but element 1210a represents the first radio device in its capacity as a primary broadcast server (e.g., to broadcast audio signals) and element 1210b represents the first radio device in its capacity as an IRRT (e.g., to receive audio signals). Moreover, it is appreciated that element 1220a and element 1220b are the same device but element 1220a represents the second radio device in its capacity as a primary broadcast server (e.g., to broadcast audio signals) and element 1220b represents the second radio device in its capacity as an IRRT (e.g., to receive audio signals). It is appreciated that the information exchanged between radio devices in Ham radio mode is not limited to audio signals and can be audio signals, video signals, multi-media content signals and/or other HTML documents or Web pages.

Figure 12B illustrates a chaincast communication configuration for the secondary broadcast servers which can operate in parallel with the transmissions of the primary broadcast servers 1210b, 1220b and 860c of Figure 1 A. In other words, the chaincast groups and the communication of the secondary information transmitted among these groups can operate in parallel with the chaincast groups of the primary information shown in Figure 12A. The chaincast groups can be different between those set up for primary information and those set up for secondary information because the PITS 855 and the SITS , 857 are separate. Applying the Internet radio example, as different Internet radios receive their radio programming (e.g., the primary information), these devices can also receive secondary information broadcasts (e.g., advertising content in audio, video or HTML formats). The PITS 855 controls the radio broadcasting while the SITS 857 controls the advertising transmissions.

As shown in Figure 1 B, the SITS 857 controls the communication of secondary information between the secondary broadcast servers 870a-870c. Server 870a chaincasts within Internet radio devices 1231 , 1233 and 1220a. Server 870b chaincasts within Internet radio devices 1232 and 1230. Server 870c communicates with Internet radio 1210. These chaincast groups can exist in parallel with the chaincast groups shown in Figure 12A which represent the primary information broadcast (e.g., the radio programming). It is appreciated that the information scheduled by the SITS 857 is done independently of the Internet radio devices.

IMPLEMENTING THE VIRTUAL RECEIVER The performance of the chaincasting architecture and the chaincast communication system described in detail above can be enhanced by implementing virtual receivers (e.g., virtual user devices or virtual information receiver and retransmitter devices (IRRTs)) in the chaincast architecture and communication system of the present invention. The terms virtual receiver, virtual user device, and virtual information receiver and retransmitter device (virtual IRRT) are equivalent and interchangeable for purposes of the discussion below. The terms real receiver, real user device, and real informatiori .receiver and retransmitter device (real IRRT) are equivalent and interchangeable for purposes of the discussion below. As discussed above, a real user device (e.g., electronic device as described above) in the chaincast architecture has chaincasting capability. A user controls the real user device to receive information from the Internet. In contrast, a virtual user device has chaincasting capability but generally does not interface with a user. Instead, the chaincast manager remotely controls the virtual user device, directing the virtual user device to access information transmitted over the Internet for retransmittal to other user devices. Thus, the chaincast manager is able to optimize the data flow within the chaincast communication system.

In one embodiment, the virtual user device is equivalent to a real user device, except that the chaincast manager remotely controls the virtual user device via an interface module included with the virtual user device. In a second embodiment, the virtual user device is implemented as a server and is remotely controlled by the chaincast manager. In this second embodiment, the virtual user device receives and retransmits broadcast information. Also, in this second embodiment, the virtual user device may render the broadcast information but generally does not render the broadcast information since a user is not available to view the rendered broadcast information.

The chaincast manager can reduce the number of user devices in a chaincast chain receiving particular information from a broadcast server by directing a virtual user device 1) to receive the particular information from the broadcast server and 2) to chaincast the particular information directly to one or more user devices which previously were linked in a longer chaincast chain. Each virtual user device can retransmit information to a larger number of user devices than the typical user device. This large fan-out bandwidth capability of the virtual user device is a consequence of the high bandwidth connection to the Internet provided to the virtual user device by an Internet Service Provider (ISP) or shared with the chaincast manager or the broadcast server, as discussed below. With the large bandwidth capability, the virtual user device can retransmit information to many immediately coupled user devices or IRRTs. Additionally, the virtual user device enables implementation of low cost multicasting (e.g., transmitting information simultaneously to many receivers without establishing separate connections for each receiver). In sum, the chaincast communication system of the present invention provides practically unlimited bandwidth resources to any type of server(e.g., broadcast or nonbroadcast) accessible via the Internet without upgrading the physical infrastructure supporting the server-to-internet connection.

Figure 15 illustrates a chaincast communication system 1500 according to one embodiment of the present invention. A content server 1508 supplies information accessible by the real user devices 1515a-e and the virtual user devices 1520a-i. The content server 1508 is coupled to the Internet Service Provider 1510b via the connection 1541. The content server 1508 can be a primary server or a secondary server, as discussed above. The chaincast manager 1505 is responsible for directing the chaincast connections among the real user devices 1515a-e and the virtual user devices 1520a-i. The chaincast manager 1505 is coupled to the Internet Service Provider 1510a via the connection 1540.

The real user device 1515a is coupled to the Internet Service Provider 1510b via the connection 1560. The real user devices 1515b and 1515c are coupled to the ISP 1510c via connections 1561 and 1562, respectively. The real user devices 1515d and 1515e are coupled to the ISP 1510d via connections 1563 and 1564, respectively. The ISPs 1510a-d are coupled to the Internet 300 via connections 1530-1533. The real user devices 1515a-e have chaincasting capability as described above. The term "chaincast" will refer to the receiving and retransmitting feature (as described above) of chaincast- enabled user devices.

The virtual user devices 1520d-e are implemented such that virtual user devices 1520d-e share connection 1541 with the content server 1508. The virtual user device 1520f is implemented such that virtual user device 1520f shares connection 1540 with the chaincast manager 1505. The virtual user device 1520c is implemented at ISP 1510b and is coupled to the Internet by ISP 1510b via connection 1531. The virtual user device 1520b is implemented at ISP 1510c and is coupled to the Internet by ISP 1510c via connection 1532. The virtual user device 1520a is implemented at ISP 1510d and is coupled to the Internet by ISP 1510d via connection 1533. The virtual user devices 1520g-i are implemented at ISP 1510a and are coupled to the Internet by ISP 1510a via connection 1530. These implementations for the virtual user devices 1520a-i are merely exemplary. Other implementations for the virtual user devices are possible. The virtual user devices 1520a-i have chaincasting capability as described above.

The real user devices 1515a-e are coupled to ISPs and the Internet 300 via connections 1560-1564, respectively. Connections 1560-1564 can be any configuration for gaining access to the Internet 300, including phone modem, Integrated Services Digital Network(ISDN), Digital Subscriber Line(DSL), T1 Line, Cable modem, etc. Typically, the real user devices 1515a-e gain access to the Internet via a phone modem. Phone modems provide a low speed/low bandwidth access to the Internet 300. Thus, in the chaincast communication system 1500, the chaincast manager may have to organize long chaincast chains (See Figures 8A-B) linking many user devices.

However, the virtual user devices 1520a-i are coupled to the Internet via connections which typically are high speed/high bandwidth. For example, the ISPs 1510a-d require high bandwidth connections 1530-1533. Hence, the virtual user devices 1520a-c and 1520g-i can provide, via control from the chaincast manager 1505, chaincast communication connections to multiple user devices via connections 1530-1533, forming smaller chaincast chains than previously possible. In addition, the virtual user devices 1520a-c and 1520g-i reduce the bandwidth requirements of the content server 1508 at connection 1541. As explained above, in one embodiment the virtual user device is equivalent to a real user device, except that the chaincast manager 1505 remotely controls the virtual user device via an interface module included with the virtual user device. In a second embodiment, the virtual user device is implemented as a server and is remotely controlled by the chaincast manager 1505. Moreover, since the virtual user devices 1520a-i have a high bandwidth connection to the Internet, the virtual user devices 1520a-i can be positioned at a higher level in the chaincast communication pyramid described above.

The virtual user devices 1520d-e share the connection 1541 with the content server 1508. The virtual user device 1520f shares the connection 1540 with the chaincast manager 1505. The connections 1540 and 1541 typically have a higher bandwidth than connections 1560-1563 used by the real user devices, but have a lower bandwidth than connections 1530-1533 used by the ISPs 1510a-d. Hence, the virtual user devices 1520d-f can provide, via control f rom the chaincast manager 1505, chaincast communication connections to multiple user devices via connections 1540 and 1541.

A chaincast communication connection can be established by a virtual user device with a real user device. A chaincast communication connection can be established by a virtual user device with another virtual user device.

A chaincast communication connection can be established by a real user device with another real user device. A chaincast communication connection can be established by a real user device with a virtual user device.

Figure 16 illustrates a chaincast communication diagram 1600 according to one embodiment of the present invention. Specifically, Figure 16 shows the "soft multicast" or "soft router for multicasting" possibilities available by implementing a virtual user device or virtual IRRT.

In the prior art, data packet streams have only one destination, requiring the server to send multiple data packet streams in order to communicate with each destination. The IP Multicasting protocol permits a data packet stream to have multiple destinations, reducing the bandwidth requirements of the server. However, IP Multicasting requires investment in new and expensive IP Multicasting infrastructure such as multicasting-enabled routers.

As shown on Figure 16, the chaincast communication system 1600 provides "soft multicast" with the virtual user device or virtual IRRT 1650 resembling a "soft router for multicasting". The term "soft" is used to describe that the chaincast communication system 1600 achieves a software- implemented version of multicasting without the expense or complexity of the IP Multicast protocol. The virtual IRRT 1650 is referred to as a "soft router for multicasting" because the virtual IRRT 1650 is directed by the chaincast manager 1605 to chaincast the information from the broadcast server 1608 to real user devices a1-aj via chaincast connections 1620a-1620d. In other words, the broadcast server 1608 transmits a data stream to virtual IRRT 1650 which then provides separate chaincast data streams via chaincast connections 1620a-d to user devices or IRRTs a1-aj. Moreover, a first chaincast chain is formed by virtual IRRT 1650, user device a1 , user device b1 , and user device d . A second chaincast chain is formed by virtual IRRT 1650, user device a2, and user device b2. A third chaincast chain is formed by virtual IRRT 1650, user device a3, user device b3, and user device c2. A fourth chaincast chain is formed by virtual IRRT 1650, user device aj, and user device bk. As explained above, the virtual user device or virtual IRRT 1650 would have the bandwidth to retransmit multiple chaincast data streams to multiple real user devices or real IRRTs if the virtual user device or virtual IRRT 1650 is implemented at the ISP, chaincast manager, or content(or broadcast) server (Figure 15).

Figure 17 is a flow diagram illustrating exemplary operations of the chaincast communication system 1500 in accordance with one embodiment of the present invention. Here, the user device is implemented as an Internet radio device. As illustrated, at step 1700, when user device-x is activated, user device-x registers with the chaincast manager (CCM) 1505. The CCM 1505 sends, for instance, a list of available radio stations to user device-x to allow a user to choose from available information transmitters (content server) 1508. At step 1710, user device-x communicates the user selection to CCM 1505. At step 1720, the CCM 1505 determines whether another user device(real user device or virtual user device) is already tuned to the same content server 1508.

At step 1730, if it is determined that another user device is not tuned to the same content server 1508, the CCM 1505 determines whether a virtual user device should be tuned to the same content server 1508. The CCM 1505 uses a variety of chaincast criteria (such as bandwidth of the content server 1508, bandwidth of the virtual user device, and length of the chaincast chains) to make this determination. At step 1755, if it is determined that a virtual user device should be tuned to the same content server 1508, the CCM 1505 tunes the virtual user device to the same content server 1508. At step 1765, the CCM 1505 instructs the virtual user device to relay data packets to user device-x.

However, at step 1760, if it is determined that a virtual user device should not be tuned to the same content server 1508, the CCM 1505 instructs the content server 1508 to broadcast directly to user device-x.

I

At step 1735, if it is determined that another user device(user device-y) is tuned to the same content server 1508, the CCM 1505 determines whether a virtual user device should be tuned to the same content server 1508. The CCM 1505 uses a variety of chaincast criteria (such as bandwidth of the content server 1508, bandwidth of the virtual user device, and length of the chaincast chains) to make this determination. At step 1740, if it is determined that a virtual user device should be tuned to the same content server 1508, the CCM 1505 tunes the virtual user device to the same content server 1508. At step 1745, the CCM 1505 instructs the virtual user device to relay data packets to user device- x.

However, at step 1750, if it is determined that a virtual user device should not be tuned to the same content server 1508, the CCM 1505 instructs the user device-y to relay data packets to user device-x.

At step 1770, user device-x receives time-stamped data packets and begins rendering the data packets.

INFORMATION DISTRIBUTION OVER THE INTERNET WITH THE CHAINCAST

COMMUNICATION SYSTEM

Figure 18 shows a flow chart diagram illustrating operations of the chaincast communication system 1500 illustrated in Figure 15 in furtherance of another embodiment of the present invention. The operations illustrated in Figure 18 are equally applicable to broadcasted data streams over the Internet and to nonbroadcasted data streams over the Internet. Figure 18 illustrates the steps performed by the chaincast communication system 1500 to transmit information, that is stored at a content server, over the Internet to the user devices upon request from the user devices.

At step 1800, the user device-x enables chaincast capability by communicating with a chaincast-enabled content server 1508. The user device-x may obtain its chaincast capability from chaincast software included with the user device-x, or from a plug-in software downloaded from the chaincast-enabled content server 1508 to the user device-x. In addition, the user device-x registers with the CCM 1505.

At step 1810, the user device-x communicates selected information to CCM 1505, where the selected information can be any type of data(e.τj., program files, audio, video, multi-media, etc.) stored at the content server 1508 or stored where the content server 1508 can access it.

At step 1820, the CCM 1505 determines whether another user device(real user device or virtual user device) is accessing and retrieving the same information. At step 1830, if it is determined that no other user device is accessing and retrieving the same information, the CCM 1505 communicates to the content server 1508 to transmit directly the selected information to user device-x. At step 1840, the user device-x receives the information in the form of data packets.

However, at step 1850, if it is determined that another user device(user device-y) is accessing and retrieving the same information, the CCM 1505 instructs the other user device(user device-y) to retransmit the information to user device-x using the chaincast method of the present invention. The CCM 1505 uses a variety of chaincast criteria (such as the bandwidth of the other user device and the bandwidth of the user device-x) to choose the user device to retransmit the information to user device-x. At step 1860, the user device-x receives the information in the form of data packets.

At step 1870, the user device-x determines whether it received all the selected information. At step 1880, if the user device-x determines that it has received all the selected information, the method of the present invention

/ terminates.

However, if it is determined that the user device-x did not receive all the selected information, the method of the present invention returns to step 1820. The user device-x communicates with the CCM 1505 and provides details to the CCM 1505 about the last data packet received (in a manner discussed above).

The preferred embodiment of the present invention, a chaincast system and method for communicating digital broadcast content to multiple users, pseudo simultaneously, without being constrained to the bandwidth of the server-to-internet connection, is described. While the present invention has been described in particular embodiments, it should be appreciated that the present invention should not be construed as limited by such embodiments, but rather construed according to the below claims.

Claims

CLAIMSWhat is Claimed is:

1. A communication system comprising: a plurality of information receiver and retransmitter devices (IRRTs) coupled to the Internet, wherein each IRRT is for receiving broadcast information and for selectively retransmitting portions of said broadcast information to another IRRT, said plurality of IRRTs including: a plurality of virtual IRRTs, wherein each virtual IRRT is configured for remote control thereof; and a plurality of real IRRTs, wherein each real IRRT is controlled by a user and is configured for rending said broadcast information; a plurality of primary broadcast servers coupled to said Internet, each for originating respective primary broadcast information that is chaincast among a group of IRRTs of said plurality of IRRTs; and a chaincast manager coupled to said Internet and for registering said plurality of primary broadcast servers and for scheduling information transfers of said respective primary broadcast information to IRRTs based on broadcast requests generated by said IRRTs to said chaincast manager, wherein said chaincast manager is configured to remotely control each virtual IRRT.

2. A communication system as described in Claim 1 wherein one or more of said virtual IRRTs is coupled to said Internet via a communication connection provided by an Independent Service Provider(ISP).

3. A communication system as described in Claim 1 wherein one or more of said virtual IRRTs is coupled to said Internet via a communication connection shared with said chaincast manager.

4. A communication system as described in Claim 1 wherein one or more of said virtual IRRTs is coupled to said Internet via a communication connection shared with one or more of said primary broadcast servers.

5. A communication system as described in Claim 1 wherein at least one of said virtual IRRTs is implemented as a server.

6. A communication system as described in Claim 1 wherein one of said virtual IRRTs receives and retransmits said broadcast information to one or more of said real IRRTs.

7. A communication system as described in Claim 1 wherein one of said virtual IRRTs receives and retransmits said broadcast information to one or more of said virtual IRRTs.

8. A communication system as described in Claim 1 wherein one of said real IRRTs receives and retransmits said broadcast information to one or more of said real IRRTs.

9. A communication system as described in Claim 1 wherein one of said real IRRTs receives and retransmits said broadcast information to one or more of said virtual IRRTs.

10. A communication system as described in Claim 1 wherein said chaincast manager remotely configures one or more of said virtual IRRTs to receive and retransmit said broadcast information to one or more of said IRRTs such that to reduce a length associated with a plurality of chain links formed by said plurality of IRRTs.

11. - A communication system as described in Claim 1 wherein said chaincast manager remotely configures one or more of said virtual IRRTs to receive and retransmit said broadcast information to one or more of said IRRTs such that to facilitate a multicast connection between one or more of said plurality of primary broadcast servers and one or more of said IRRTs, wherein said multicast connection reduces a bandwidth resource requirement associated with a nonmulticast connection.

12. A communication system as described in Claim 1 further comprising a plurality of secondary broadcast servers coupled to the Internet and each for originating respective secondary broadcast information that is chaincast among a group of IRRTs of said plurality of IRRTs.

13. A communication system as described in Claim 12 wherein said chaincast manager is also for scheduling information transfers of said secondary broadcast information to IRRTs.

14. A communication system as described in Claim 13 wherein said primary broadcast information is digitally encoded audio information representing audio programs and wherein said plurality of primary broadcast servers are radio stations.

15. A communication system as described in Claim 14 wherein each IRRT comprises a computer system for rendering a graphical user interface display of a radio device for allowing a user to request one or more of said primary broadcast servers from which to receive primary broadcast information.

16. A communication system as described in Claim 13 wherein said primary broadcast information is digitally encoded audio/visual information representing audio/visual programs and wherein said plurality of primary broadcast servers are television stations.

17. A communication system as described in Claim 13 wherein said primary broadcast information is digitally encoded audio/visual information representing audio/visual programs and wherein said plurality of primary broadcast servers are multi-media content providers.

18. A communication system as described in Claim 13 wherein said secondary broadcast information is digitally encoded audio information representing advertising content and wherein said plurality of secondary broadcast servers are advertisers.

19. A communication system as described in Claim 13 wherein said secondary broadcast information is digitally encoded audio/visual information representing advertising content and wherein said plurality of secondary broadcast servers are advertisers.

20. A communication system as described in Claim 13 wherein said secondary broadcast information is digitally encoded information representing news material.

21. A method of optimizing communication of broadcast information over the Internet comprising the steps of: a) monitoring a plurality of chaincast communication connections between a primary server and a plurality of user devices, wherein said primary server and said plurality of user devices are coupled to the Internet, and wherein said plurality of user devices includes a plurality of virtual user devices each configured for remote control thereof and a plurality of real user devices each configured for control by a user, further wherein said primary server communicates primary broadcast information via the plurality of chaincast communication connections; b) before establishing a new chaincast communication connection between said primary server and an unconnected user device, determining whether to establish a first chaincast communication connection between said primary server and one of said plurality of virtual user devices in accordance with a plurality of chaincast criteria; and c) establishing said new chaincast communication connection in accordance with said plurality of chaincast criteria.

22. A method as recited in Claim 21 wherein said step b) comprises the steps of: determining whether one of said plurality of virtual user devices is chaincast connected to said primary server; if required by said plurality of chaincast criteria, establishing said first chaincast communication connection between said primary server and one of said plurality of virtual user devices.

23. A method as recited in Claim 21 wherein a chaincast manager performs said step b), further wherein said chaincast manager is coupled to the Internet and is configured to remotely configure said plurality of virtual user devices.

24. A method as recited in Claim 23 wherein one or more of said virtual user devices is coupled to said Internet via a communication connection provided by an Independent Service Provider(ISP).

25. A method as recited in Claim 23 wherein one or more of said virtual user devices is coupled to said Internet via a communication connection shared with said chaincast manager.

26. A method as recited in Claim 23 wherein one or more of said virtual user devices is coupled to said Internet via a communication connection shared with said primary server.

27. A method as recited in Claim 23 wherein said chaincast manager remotely configures one or more of said virtual user devices to receive and retransmit said primary broadcast information to one or more of said user devices such that to reduce a length associated with a plurality of chain links formed by said plurality of user devices.

28. Λ method as recited in Claim 23 wherein said chaincast manager remotely configures one or more of said virtual user devices to receive and retransmit said primary broadcast information to one or more of said user devices such that to facilitate a multicast connection between said primary server and one or more of said user devices, wherein said multicast^" connection reduces a bandwidth resource requirement associated with a nonmulticast connection.

29. A method as recited in Claim 21 wherein said plurality of user devices each comprises a hardware Internet radio device.

30. A method as recited in Claim 29 wherein said primary broadcast information comprises content broadcast by a radio station.

31. A method as recited in Claim 21 wherein said plurality of user devices each comprises a computer system configured for rendering said primary broadcast information and for re-transmitting said primary broadcast information to another computer system coupled to the Internet.

32. A method of communicating information over the Internet comprising the steps of: a) selecting first information stored in a chaincast-enabled server for communicating to a first user device; b) causing said first user device to transmit first registration information to a chaincast manager; c) causing said chaincast-enabled server to establish a first connection with the first user device and to communicate said first information to said first user device as instructed by the chaincast manager; d) selecting said first information stored in said chaincast-enabled server for communicating to a second user device; e) causing said second user device to transmit second registration information to said chaincast manager; f) determining where to connect said second user device such that to communicate said first information to said second user device in accordance with a plurality of chaincast criteria; and g) establishing a second connection as determined by step f) for said second user.

33. A method as recited in Claim 32 wherein said step f) comprises the steps of: determining whether said first user device can chaincast said first information to said second user device; and determining whether said chaincast-enabled server has a bandwidth to support communication with said second user device.

34. A method as recited in Claim 33 further including the steps of: h) selecting said first information stored in said chaincast-enabled server for communicating to a third user device; i) causing said third user device to transmit third registration information to said chaincast manager; j) determining where to connect said third user device such that to communicate said first information to said third user device in accordance with said plurality of chaincast criteria; and k) establishing a third connection as determined by step j) for said third user.

35. A method as recited in Claim 34 wherein said step j) comprises the steps of: determining whether said first user device can chaincast said first information to said second user device; determining whether said second user device can chaincast said first information to said third user device; and determining whether said chaincast-enabled server has said bandwidth to support communication with said third user device.

36. A method as recited in Claim 35 further including the step of determining where to connect one of said first, second, and third user devices if one of said first, second, and third user devices loses an associated connection transmitting said first information before receiving all of said first information.

37. A method as recited in Claim 32 wherein said first user device, said second user device and said third user device each comprises a computer system.

38. A method as recited in Claim 37 wherein said computer system comprises Web browser software having a plug-in module with chaincasting capability.

39. The system of any one of Claims 1 through 19 wherein each said IRRT is receiving and rendering broadcast in ormation.