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Method and apparatus for enhancing wireless data network telephony including a personal router in a clientRelated Patent Categories: Telecommunications, Radiotelephone System, Zoned Or Cellular Telephone System, Location Monitoring, At System Equipment (i.e., Base Station)Method and apparatus for enhancing wireless data network telephony including a personal router in a client description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070191030, Method and apparatus for enhancing wireless data network telephony including a personal router in a client. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] The present invention is in the field of network communications, including Data Network Telephony (DNT), such as Internet Protocol Network Telephony (IPNT) and pertains more particularly to methods and apparatus for enhancing DNT in narrow bandwidth wireless links. BACKGROUND OF THE INVENTION [0002] The art of telephony communication has grown in proportion with improved telephony infrastructure, equipment, and methods of practice. Conventionally and historically telephone communication has been practiced by use of networks that provide dedicated connections and guaranteed bandwidth, such as in Publicly Switched Telephony Networks (PSTN). In such networks a call placed from a telephone connected to a local service is switched over dedicated channels to a destination, and as long as the connection is maintained, the dedicated path, having a dedicated bandwidth, is also maintained. Such networks may be termed Connection Oriented/Switched Telephony (COST) networks, and this term is used in this specification. [0003] More recently, with the development of extensive data networks, of which the well-known Internet is a prime example, a newer type of telephony communication has been introduced. This form of telephony is termed herein Data Network Telephony (DNT), and, in the context of the Internet data network Internet Protocol Network Telephony (IPNT). Data networks typically link computers over one or more sub-nets, which may include local area networks (LAN), wide area networks (WAN) such as the Internet, company Intranets, and combinations of these and other data networks. [0004] In DNT, such as IPNT, dedicated connections are not provided except in rare and special instances. Instead, digital audio data is prepared in standardized audio packets complete with header information and the like. The packets are prepared in near real-time and broadcast over the data network(s) connecting involved computers adapted for DNT applications. The header for each packet includes a destination for the packet. [0005] Data Network Telephony, such as IPNT is well-known in the art, and wireless data transmission is also quite well-known in many applications. Internet service providers, for example, are recently providing high data-rate wireless Internet access by satellite systems, and, where bandwidth is not substantially restricted at the receiver's end, such systems have proven successful for WEB page delivery and the like. Such systems have not proved to be friendly for DNT applications, and there are a number of reasons, which apply to these kinds of systems and to other kinds of wireless systems of more limited bandwidth even more so. [0006] The problems for Data Network Telephony in wireless systems are related to the real-time nature of telephony data and the typically limited bandwidth available in such systems. In relatively high-bandwidth systems having a relatively large number of users the distribution probabilities provide a situation where it is uncommon for several or many users to demand unusual bandwidth at the same time. The phenomenon is known in the art as averaging. Even with known high-use times, it can be expected that distribution will be such that bandwidth will be adequate. In most wireless systems however, bandwidth is more precious, and averaging is hence not as helpful. [0007] A contributing problem is in the nature of real-time audio data as opposed to data transmitting stored documents and the like, which may be called data-data as opposed to voice-data. Data-data is prepared in packets for transmission from stored data of known capacity. The number of data packets needed to transmit a stored document, whether text, graphic, audio, or other, is a known quantity. Moreover, there is no fundamental loss if such data becomes delayed in transit. Once it arrives at a destination, the document may be reproduced. [0008] Voice-data packets for real-time conversations are different. The packets for voice-data have to be prepared and transmitted in essentially real time in both directions or a meaningful conversation cannot be held. Moreover, the magnitude of packaged voice-data for a conversation will be inflated by acoustical background noise, which under some conditions can double or triple or even further multiply the amount of data having to be sent, imposing severe demand on available bandwidth. [0009] The inventor has carefully considered the possibilities of a number of types of potential DNT applications, and has determined that it is desirable to provide DNT in wireless systems of many sorts to take advantage of some of the inherent advantages of DNT over dedicated connection-type telephony systems, and to provide DNT capability in systems that also are capable of data transfer of the data-data type described above, such as of stored digital documents and entities. A novel system in this patent application is proposed, for example, using relatively small, battery-powered, hand-held computer communicators with DNT capability to be carried by users within range of multiple Network Interface Adapters (satellite transceivers). In a preferred embodiment wireless communication is provided by RF signaling. The invention, however, is not limited to RF, and could be implemented in an Infra system or any other system providing wireless communication. [0010] In such a system the Network Interface Adapters may be coupled, for example, to a Local Area Network. Such a system would be quite useful on a company premises for workers to keep in touch, hold phone conversations, share documents locally (Campus Intranet), and communicate with the Internet and other connected computers as well (Inter Campus Intranets or Extranets). Many variations of such systems are possible, but present technology does not render such systems really practical. Methods and apparatus according to various embodiments and aspects of the present invention, taught in enabling detail below, provide substantial improvements rendering such voice/data systems on narrow bandwidth links quite feasible and useful. SUMMARY OF THE INVENTION [0011] In a preferred embodiment of the present invention a data network telephony (DNT) system is provided, comprising a base station connected to a DNT-capable data network and to a plurality of wireless transceivers, each transceiver transmitting to a distinct area, the base station adapted to operate the transceivers by a two-way, narrow-band, multiple-channel, real-time duplex radio protocol; and a plurality of portable computer-enhanced client communicator units, including microphone and speaker apparatus, each assigned a unique address and adapted to communicate with the base station via the transceivers by the two-way real-time radio protocol and to process DNT calls. The wireless system operates as a carrier-sense multiple access system with collision detection (CSMA/CD). [0012] In some embodiments a personal router application executes on the client communicators, enabling individual clients to edit routing rules for their own communicator IDs, and to upload the edited rules to the base station or one of the transceivers for use in routing incoming calls. In some other embodiments the personal router application executes on the base station or one of the transceivers. [0013] In some embodiments smooth transition from one transceiver area to another is promoted by the base station maintaining a routing table listing addresses of communicators operating in the area of each connected transceiver, and updating the routing table in the base station as operating communicators move from one area to another. In these embodiments there may be a hierarchical network of connected routers between the data network and a plurality of base stations each connected to at least one transceiver, each router and base station maintaining a routing table, wherein an operating communicator moving from one area to another causes updating to occur in a minimum number of routers, and wherein each base station is adapted to interact with client communicators in personal routing functions. [0014] In embodiments of the invention taught in enabling detail below, for the first time a wireless IPNT network is provided enabled to operate as a CSMA/CD system, providing thereby efficient sharing of available bandwidth. BRIEF DESCRIPTION OF THE DRAWING FIGURES [0015] FIG. 1 is an architectural overview of a wireless DNT system according to an embodiment of the present invention. [0016] FIG. 2 is a system diagram of the components and connectivity of components within a hand-held DNT device and associated network elements according to an embodiment of the present invention. [0017] FIG. 3A is a block diagram illustrating DSP function according to an embodiment of the present invention. [0018] FIG. 3B is a perspective view of unit 100 of FIG. 1 showing speaker and microphone placement. [0019] FIG. 4 is a conceptual diagram illustrating QoS components and negotiation according to an embodiment of the present invention. [0020] FIG. 5 is a block diagram illustrating dynamic address translation according to an embodiment of the present invention. Continue reading about Method and apparatus for enhancing wireless data network telephony including a personal router in a client... 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