Patent Abstract:
A wireless office communication system including a multi-protocol wireless internet base station (WIBS) encompassing a base station controller, a mobile switch controller and an ethernet interface module for coupling the WIBS to an existing internet protocol (IP) based network. The interface module provides for coupling the WIBS to an ethernet back-bone, a mobile communication unit and a public switch telephone network (PSTN). In one embodiment of the invention, a maintenance and operation server is coupled to the ethernet back-bone to allow a technician to remotely call into the enterprise system from a mobile system such as a lap-top computer or a personal digital assistant (PDA) to perform typical system operations and maintenance functions via the internet.

Full Description:
FIELD OF THE INVENTION 
   The present claimed invention relates generally to the field of wireless communication systems. More particularly, the present claimed invention relates to the remote operation and maintenance of a packet based wireless base station which interfaces with Call Agents using a wireless signaling protocol. 
   BACKGROUND ART 
   Local area networks such as Ethernet are well known. Most local area networks are wired, so that each station is connected directly or indirectly to all other stations by cabling or wires, thus providing full connectivity between all stations. Such local area networks avoid collisions and achieve efficient use of the communications channel by well known carrier sensing and collision avoidance schemes. Such schemes are typically not suitable for wireless networks. Communication systems that utilize coded communication signals are also well known in the art. One such system is a code division multiple access (CDMA) cellular communication system such as set forth in the Telecommunications Industry Association/Electronic Industries Association International Standard (TIA/EIA IS-95), hereinafter referred to as IS-95. 
     FIG. 1  is an illustration of a conventional prior art CDMA system. In the system shown in  FIG. 1 , base stations  110  and  120  are connected to a base station controller  130  and a mobile switching controller  140  which is in turn connected to the public switched telephone network (PSTN)  150  and a public land mobile network (PLMN)  160  using known techniques. 
   In the system shown in  FIG. 1 , when a communication unit (CU)  105 ,  107 , or  106  initiates a call sequence to either one of the base stations  110  and  120  within a coverage area, an end-to-end connection is established between the respective base stations, the base station controller  130  and the MSC  140 using known CDMA call setup techniques. The base stations  110  and  120  typically communicate with the BSC  130  and the MSC  140  via communication links, such as a T1 connection. Base stations  110  and  120  typically have antennas to define the coverage area within which either base stations primarily accommodate the communication units. 
   With the proliferation of wireless devices in the office and school environment, the communication system shown in  FIG. 1  can be very expensive if implemented in an office or in-building environment. The system in  FIG. 1  also has the inherent problem of wireless voice and data signal quality degradation if implemented in an in-building environment. 
   To alleviate the problems of the system shown in  FIG. 1  and with the advent of enterprise based wireless networks, some prior art CDMA systems implement the system shown in  FIG. 2 .  FIG. 2  includes a plurality of clients, a plurality of base transceiver stations  201 ,  202 ,  203 , and a set of base station controllers  110  and  120 , which are coupled to O&amp;M sever  210  and a mobile switching center  140 . O&amp;M server  210  is coupled to O&amp;M clients  215  and  220 . In the system illustrated in  FIG. 2 , a wireless base station is connected to existing ethernet network infrastructure to enable the CDMA system to utilize existing internet protocol techniques to allow communication between wireless devices connected to the ethernet network. 
   The system in  FIG. 2  utilizes a combination of wireless signaling protocol and media gateway protocol to allow wireless call handling and other multi-media data transmission. A wireless signaling protocol is necessary in order to handle mobile terminals. Communications on the LAN is implemented between requestors of information (clients) and providers of the information (servers) via a communication protocol such as a Transmission Control Protocol (TCP). 
   Despite the robustness of the system in  FIG. 2  in an in-building wireless environment, there are some disadvantages which characterize such systems and other prior art CDMA systems when it comes to the maintenance and operation of such systems. 
   First, in these conventional systems such as that in  FIG. 2 , the method of operating and maintaining of the wireless network is by connecting an operation and maintenance server(s) to the wireless network using either SS7, X.25 or other LAN connections. In these systems, a operation and maintenance center is equipped with operation and maintenance servers with associated operation and maintenance tools. Access to the servers is limited to operations and maintenance client systems which are physically connected to the network. 
   Due to the mobility constraints of such systems, a technician is required to be stationed in the O&amp;M center to physically monitor the operation of the network. With the proliferation and advances of the internet and intranets, some O&amp;M clients can be remotely connected to the O&amp;M servers to handle the required network management of these systems. As accessibility to the internet from remote locations continues to become more widely available and convenient, utilizing the internet to perform such tasks such as remote system operation and maintenance becomes increasingly desirable. Some methods have been developed in the prior art to allow for such remote access management. However, such methods require access to the O&amp;M server via a Call Agent connected to the network. Processing O&amp;M server calls through the Call Agent can be time consuming, cumbersome and take Call Agent resources away from conventional mobile devices accessing the network. 
   Thus, it is desirable to have a system and a method for handling remote access requests to a CDMA wireless enterprise system for system operation and maintenance management. There is a further desire to have a system for transmitting CDMA calls including voice and data over a communication pathway with a higher bandwidth such as the internet. It is further desirable to have a CDMA system that handles the transmission of calls, especially data calls, without the inherent difficulties of using a variety of transmission protocols for the same call. A need further exists for improved and less costly systems which improve efficiency and the transmission rate and time of calls between a mobile unit and a base station and between base stations and a base station controller and between adjacent base stations. 
   SUMMARY OF INVENTION 
   The present invention is directed to a system and a method for providing an enterprise in-building or campus-wide IP based code division multiple access (CDMA) wireless system. The present invention is capable of handling both voice and data transmission over an internet protocol local access network within the CDMA system without the inherent delays and signal quality degradation encountered by conventional CDMA systems. The present invention further provides a system and method of providing a remote wireless operation and system maintenance of a wireless enterprise system by utilizing existing internet protocol and communication language. 
   Embodiments of the invention include a system for a wireless base station which couples to existing local area networks (LAN) within an enterprise to provide remote access to a mobile wireless client which may be used to perform routine system operation and maintenance management. The base station further includes call processing determination logic which handles the decision of directing mobile calls received by the base station to either a call agent attached to the LAN or a operation and maintenance server which is also attached to the LAN. 
   In one embodiment of the present invention the base station and operation and maintenance server negotiate to set a predefined number to allow a mobile operation and maintenance client to call into the enterprise system. The mobile operation and maintenance call number is also dynamically negotiated and set by the base station and the operation and maintenance server in order to allow multiple operation and maintenance clients to call into the enterprise system. 
   In order to handle mobile operation and maintenance clients, the operation and maintenance server includes call processing logic which enables the server to perform call agent like functions. This allows the mobile operation and maintenance client to call into the enterprise system and allow a technician to perform typical operations and maintenance functions without having to be physically tied to the operation and maintenance server. The ability to perform call agent like functions by the operation and maintenance server is not available in the prior art. 
   The present invention further provides an implementation advantage over the prior art by allowing inter network communication between the wireless office communication system of the present invention and other mobile networks on the public land mobile network. The inter-networking communication of the present invention is implemented over an IP LAN using the ethernet transport protocol of UDP/IP or TCP/IP transport protocol via an ethernet interface to the ethernet back-bone of the system. The use of the ethernet interface is less costly than the prior art and further allows easy and flexible connectivity to existing in-office, building or campus networks. 
   These and other objects and advantages of the present invention will no doubt become obvious to those of ordinary skill in the art after having read the following detailed description of the preferred embodiments which are illustrated in the various drawing figures. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The accompanying drawings, which are incorporated in and form a part of this specification, illustrates embodiments of the invention and, together with the description, serve to explain the principles of the invention: 
     Prior Art  FIG. 1  is a block diagram of a conventional code division multiplex access (CDMA) system; 
       FIG. 2  is a block diagram of an implementation of a prior art enterprise CDMA system; 
       FIG. 3  is a block diagram of a remote wireless CDMA operation and maintenance system of the present invention; 
       FIG. 4  is a block diagram of an embodiment of a wireless base station and a operation and maintenance server of the present invention; and 
       FIG. 5  is a block diagram of an embodiment of the call message flow from a wireless operation and maintenance client to a operation and maintenance server of the present invention. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the preferred embodiments, it will be understood that they are not intended to limit the invention to these embodiments. 
   On the contrary, the invention is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be obvious to one of ordinary skill in the art that the present invention may be practiced without these specific details. 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. 
   The invention is directed to a system, an architecture, subsystem and method to manage a wireless CDMA data communication in a way superior to the prior art. In accordance with an aspect of the invention, a base station allows CDMA call coverage within a building without requiring a dedicated and a lengthy end-to-end transmission. 
   In the following detailed description of the present invention, a system and method for a wireless internet protocol based communication system is described. Numerous specific details are not 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. 
   Generally, an aspect of the invention encompasses providing an integrated wireless internet protocol based in-building or campus-wide CDMA communication system which provides a wide range of voice, data, video and other services in conjunction with a private branch exchange interfaced to the Public Switched Telephone Network (PSTN) and the Public Land Mobile Network (PLMN). The invention can be more fully described with reference to  FIGS. 3 through 5 . 
     FIG. 3  is a functional illustration of the wireless system of the present invention. Wireless System  300  (WS) comprises, one or more mobile or wireless communication units  303 , a plurality of enterprise wireless base stations (WIBS)  310 – 318 , a Call Agent  320  coupled to an ethernet backbone of the LAN  301 , a public switch telephone network gateway  330  (PSTN) which further couples to the Public Switch Telephone Network  324 , an internet/intranet gateway  340  which couples to the internet  342  and an enterprise intranet  343  and an operations and maintenance server  350 . 
   In the system illustrated in  FIG. 3 , a remote access wireless operation and maintenance client  305  couples to WS  300  via any of the wireless base stations to provide a operation and maintenance management technician access to the operation and maintenance server  350 . The maintenance technician may access the WS  300  by using well known internet browsers to login into the enterprise system. 
   In order to enable a wireless operation and maintenance management functions, wireless client software which is running on a mobile terminal  305  establishes a data link (either an Asynchronous or Packet date link) to the operations and maintenance server  350  via one of base stations  310 – 318 . In the present invention mobile terminal unit  305  may be a personal digital assistant (PDA) with wireless connectivity, a notebook computer connected to a mobile phone, a web-enable mobile phone or any wireless computer system. 
   To establish the data link to the operations and maintenance server  350 , mobile unit  305  transmits an access request to either of the WIBS  310 – 318 . The access request is in the form of a unique operations identification number which is predetermined and pre-negotiated between the operations and maintenance server  350  and the base station. The operation identification number is a numerical digit of a predetermined length which may be dynamically updated between the base stations and the operations and maintenance server as part of the operation and maintenance server&#39;s managed information base. 
   Anyone of base stations  310 – 318  which receives an O&amp;M server call request from mobile unit  305  initiates a data call setup procedure with the operations and maintenance server  350  rather than with the Call Agent  320 . After a data call has been established between the mobile unit  305  and server  350 , a point to point protocol session is established between terminal  305  and server  350 . The Point-to-Point Protocol session enables terminal  305  to establish a data link connection to the O&amp;M server to allow communication (e.g. the transfer of operational commands and instructions) between the wireless O&amp;M client and the server  350 . The Point-to-Point Protocol provides data-link connection and typically has the IP protocol running on top of it. 
   Once the Point-to-Point Protocol session is established, terminal  305  is able to initiate and establish a HTTP session to server  350  to access to the maintenance and operation tools in server  350  MIB and function as if the operations and maintenance client running on terminal  305  is directly connected to LAN  301 . Thus, all operations typically performed by client  352  is now performed by client  305 . 
   Referring now to  FIG. 4 , a block diagram of an embodiment of the WIBS  310  and O&amp;M server  350  is provided. As shown in  FIG. 4 , WIBS  310  includes call processing logic unit  410 , O&amp;M call processing logic  420  and O&amp;M access control and logic unit  430 . Call processing logic  410  is coupled to receive non-O&amp;M wireless call requests intended for Call Agent  320  ( FIG. 3 ) via WIBS  310  for typical CDMA wireless call functions. 
   Call processing logic  410  performs call processing functions which typically would have been performed by Call Agent  320 . By having call processing logic  410  in the O&amp;M server, the O&amp;M server ensures routing of non-operation and maintenance calls to Call Agent  320 . 
   O&amp;M call processing logic  420  is coupled to receive O&amp;M calls from O&amp;M wireless clients to access the O&amp;M server  350 . In the preferred embodiment O&amp;M call processing logic is able to determine whether to access the O&amp;M server  350  by using a unique call identification number which is provided by Call access control unit  430 . Call access control unit  430  is coupled to negotiate with the O&amp;M server  350  unique call identification numbers which would allow remote O&amp;M wireless clients to directly access the O&amp;M server  350 . In the preferred embodiment, the call identification number is a alphanumeric number (e.g., #3333) which is pre-determined between the O&amp;M server and the base station and is stored in the O&amp;M server&#39;s managed information base. 
   In the present invention, call access control logic  430  is capable of dynamically negotiating with the O&amp;M server  350  to set an access number which only allows remote access to the O&amp;M server  350  by remote wireless O&amp;M client systems. Control logic  430  is also capable of negotiating a pre-determined access code which is stored in WIBS  310  to allow WIBS  310  to determine whether an incoming call request is to be sent to the O&amp;M server  350  or to Call Agent  320 . 
   Still referring to  FIG. 4 , O&amp;M server  350  includes access control logic unit  440 , call processing logic unit  450  and O&amp;M function logic unit  460 . Access control logic unit  440  performs similar function as access control logic unit  430 . O&amp;M call processing logic  450  negotiates with WIBS  310  to set dynamically or statically the access code for wireless O&amp;M clients to access the O&amp;M server  350 . 
   Call processing logic  450  is coupled to provide call processing functions to the O&amp;M server  350 . Having a call processing logic in the O&amp;M server is a novel way of having the O&amp;M server provide call agent like functions which the prior art does not provide. Processing logic unit  450  also provides the O&amp;M server  350  call processing capabilities to ensure that O&amp;M client calls do not compete with other conventional mobile calls to the enterprise system. 
   Calls processed by call processing logic  450  are handed-off to O&amp;M server functions logic  460  which grants remote access processing of O&amp;M functions and tools to the O&amp;M remote client. O&amp;M server functions logic  460  also provides other typical O&amp;M functions for O&amp;M clients physically connected to the enterprise system. 
   Referring now to  FIG. 5  is a sequence flow diagram of the wireless operation and maintenance operation of the present invention. The operation of present invention is initiated by a mobile operation and maintenance client issuing a connect request for a data call for wireless operation and maintenance number via request signal  510  to WIBS  310 . 
   In the preferred embodiment, the request number may be a predetermined alphanumeric number (e.g., #3333). The mobile terminal originates a data call service option and calls the requested number by transmitting the data call request via signal  520  to the WIBS  310 . When WIBS  310  detects the wireless operation and maintenance request signal it sends a connection management service request to the operation and maintenance server via request signal  530 . 
   The operation and maintenance server  350  responds to the WIBS  310  request by establishing a data connection to the mobile terminal on a dedicated traffic channel and transmitting an acknowledgment signal via signal  540  to the WIBS  310 . In response to the traffic channel signal from the operation and maintenance server, the WIBS establishes a data connection to the mobile terminal of the traffic channel at step  550  of  FIG. 5  to enable the mobile terminal to communicate to the operation and maintenance server. 
   When the mobile terminal receives signal  555 , mobile terminal establishes a Point-to-Point Protocol connection (step  560 ) with the operation and maintenance server to begin communications with the maintenance and operation tools. To communicate with the operation and maintenance server, the operation and maintenance running on the mobile terminal establishes a web connection with server via signal  570  and send operation and maintenance commands using HTML or other similar internet communication language at step  580  of  FIG. 5 . 
   The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents.

Technology Classification (CPC): 7