초록 ▼

The invention relates to a multipath propagation delay determining means (STU, FIGS.6, 7) for determining a power delay spectrum (DPS) of a CDMA signal transmission between a CDMA base station (BS) and a CDMA mobile station (MS) on a plurality of propagation paths (P1, P2) within a cell (CL) of a CD

The invention relates to a multipath propagation delay determining means (STU, FIGS.6, 7) for determining a power delay spectrum (DPS) of a CDMA signal transmission between a CDMA base station (BS) and a CDMA mobile station (MS) on a plurality of propagation paths (P1, P2) within a cell (CL) of a CDMA communication system, comprising an A/D conversion means (A/D) for converting an analog CDMA multipath signal (S1, S2) received from at least one antenna (Ant1, Ant2) within said cell (CL) into a digital CDMA multipath signal (S1, S2) consisting of consecutive radio frames (RF1. . . RFn) including consecutive time slots (TS1. . . TSm) with complex pilot symbols (PSi) and data symbols (Pdi), a demultiplexing means (PI-DEMUX) for extracting complex pilot symbols (PSi) and data symbols (PDi) from at least two consecutive time slots (TSk−1, TSk, TSk+1) of each radio frame (RFn) and for storing them consecutively in a memory means (BUF) thereof; and a searching means (S1. . . SL) for determining a power delay profile (DPS, DPS1, DPS2, FIG.14) of said each antenna (Ant.1, Ant.2) on the basis of said extracted and stored complex pilot symbols and said data symbols (PSi, PDi).

대표청구항 ▼

The invention relates to a multipath propagation delay determining means (STU, FIGS.6, 7) for determining a power delay spectrum (DPS) of a CDMA signal transmission between a CDMA base station (BS) and a CDMA mobile station (MS) on a plurality of propagation paths (P1, P2) within a cell (CL) of a CD

The invention relates to a multipath propagation delay determining means (STU, FIGS.6, 7) for determining a power delay spectrum (DPS) of a CDMA signal transmission between a CDMA base station (BS) and a CDMA mobile station (MS) on a plurality of propagation paths (P1, P2) within a cell (CL) of a CDMA communication system, comprising an A/D conversion means (A/D) for converting an analog CDMA multipath signal (S1, S2) received from at least one antenna (Ant1, Ant2) within said cell (CL) into a digital CDMA multipath signal (S1, S2) consisting of consecutive radio frames (RF1. . . RFn) including consecutive time slots (TS1. . . TSm) with complex pilot symbols (PSi) and data symbols (Pdi), a demultiplexing means (PI-DEMUX) for extracting complex pilot symbols (PSi) and data symbols (PDi) from at least two consecutive time slots (TSk−1, TSk, TSk+1) of each radio frame (RFn) and for storing them consecutively in a memory means (BUF) thereof; and a searching means (S1. . . SL) for determining a power delay profile (DPS, DPS1, DPS2, FIG.14) of said each antenna (Ant.1, Ant.2) on the basis of said extracted and stored complex pilot symbols and said data symbols (PSi, PDi). rdinates of that mobile client in HTTP requests; wherein the servers select and return different geographically-dependent content to the hyperlink browsers in response to the HTTP requests depending on the geographical coordinates in the HTTP requests; and wherein the servers return valid radii specifications in conjunction with returned geographically-dependent content, each valid radius specification indicating a radius from the geographical coordinates of an HTTP request, within which a returned geographically-dependent content is considered valid. 3. A hyperlink browsing system comprising: a plurality of servers that provide hyperlinked content on a wide-area network, wherein at least some of the hyperlinked content is geographically-dependent; a plurality of mobile clients that communicate with the wide-area network over a wireless communications medium, the mobile clients having varying location; the mobile clients having positioning receivers that generate varying, geographical coordinates indicating the vary locations of the mobile clients; the mobile clients having hyperlink browsers that are responsive to user designations of hyperlinked content to send HTTP requests to servers and to render content that is returned in response to the HTTP requests; wherein the hyperlink browser of a particular mobile client includes current geographical coordinates of that mobile client in HTTP requests; wherein the servers select and return different geographically-dependent content to the hyperlink browsers in response to the HTTP requests depending on the geographical coordinates in the HTTP requests; wherein the servers return valid zone specifications in conjunction with returned geographically-dependent content, the valid zone specifications indicating geographical zones within which the returned geographically-dependent content is considered valid; and the hyperlink browser of a particular mobile client sends a new resource request when that mobile client leaves the geographical zone specified for particular returned geographically-dependent content. 4. A computer-readable storage medium having stored thereon a hyperlink browser program, the hyperlink browser program being executable by a mobile computer to perform steps comprising: accepting a designation of hyperlinked content from a user; obtaining current geographical coordinates of the mobile computer from a global positioning receiver associated with the mobile computer; in response to user designation of hyperlinked content, sending an HTTP request to a hyperlinked content network over a wireless transmission medium; including the current geographical coordinates of the mobile computer in the HTTP request; and receiving geographically-dependent content from the hyperlinked content network as a result of the HTTP request, wherein a valid zone specification is returned to the hyperlink browser program conjunction with the geographically-dependent content, the valid zone specification indicating a geographical zone within which the geographically-dependent content is considered valid. 5. A computer-readable storage medium having stored thereon a hyperlink browser program, the hyperlink browser program being executable by a mobile computer to perform steps comprising: accepting a designation of hyperlinked content from a user; obtaining current geographical coordinates of the mobile computer from a global positioning receiver associated with the mobile computer; in response to user designation of hyperlinked content, sending an HTTP request to a hyperlinked content network over a wireless transmission medium; including the current geographical coordinates of the mobile computer in the HTTP request; receiving geographically-dependent content from the hyperlinked content network as a result of the HTTP request, wherein a valid zone specification is returned to the hyperlink browser program conjunction with the geogr aphically-dependent content, the valid zone specification indicating a geographical zone within which the geographically-dependent content is considered valid; and sending a new HTTP request when the mobile computer leaves the indicated geographical zone. 6. A computer-readable storage medium having stored thereon a hyperlink browser program, the hyperlink browser program being executable by a mobile computer to perform steps comprising: accepting a designation of hyperlinked content from a user; obtaining current geographical coordinates of the mobile computer from a global positioning receiver associated with the mobile computer; in response to user designation of hyperlinked content, sending an HTTP request to a hyperlinked content network over a wireless transmission medium; including the current geographical coordinates of the mobile computer in the HTTP request; receiving geographically-dependent content from the hyperlinked content network as a result of the HTTP request, wherein a valid radius is returned to the hyperlink browser program conjunction with the geographically-dependent content, the valid radius indicating a radius from the current geographical coordinates within which the geographically-dependent content is considered valid; and invalidating the geographically-dependent content when the mobile computer leaves an area encompassed by the radius. 7. A mobile information system comprising: a mobile hyperlink browser that communicates with one or more remote servers, wherein a plurality of hyperlinked content is available from said one or more remote servers, at least some of the hyperlinked content being geographically-dependent; wherein the mobile hyperlink browser sends resource requests to the one or more servers; wherein at least some of the resource requests from the mobile hyperlink browser include geographical coordinates indicating the current location of the mobile hyperlink browser; wherein the servers return valid zone specifications in conjunction with returned geographically-dependent content, the valid zone specifications indicating geographical zones within which the returned geographically-dependent content is considered valid; and the mobile hyperlink browser invalidates returned geographically-dependent content when the mobile hyperlink browser leaves the geographical zone specified for that returned geographically-dependent content. 8. A mobile information system comprising: a mobile hyperlink browser that communicates with one or more remote servers, wherein a plurality of hyperlinked content is available from said one or more remote servers, at least some of the hyperlinked content being geographically-dependent; wherein the mobile hyperlink browser sends resource requests to the one or more servers; wherein at least some of the resource requests from the mobile hyperlink browser include geographical coordinates indicating the current location of the mobile hyperlink browser; wherein the servers return valid zone specifications in conjunction with returned geographically-dependent content, the valid zone specifications indicating geographical zones within which the returned geographically-dependent content is considered valid; and the mobile hyperlink browser sends a new resource request when the mobile hyperlink browser leaves the geographical zone specified for particular returned geographically dependent content. 9. A mobile information system comprising: a computer; a wireless communications interface that provides communications between the computer and a remote server over a wireless communications medium; a hyperlink browser that executes on the computer, the hyperlink browser sending resource requests to the remote server over the wireless communications medium; a positioning receiver that generates varying geographical coordinates indicating the varying location of the computer; wherein the hyperlink browser includ es the varying geographical coordinates in at least some of the resource requests; wherein the remote server returns a valid zone specification in conjunction with returned geographically-dependent content, the valid zone specification indicating a geographical zone within which the returned geographically-dependent content is considered valid; and the hyperlink browser invalidates returned geographically-dependent content when the computer leaves the geographical zone specified for that returned geographically-dependent content. 10. A mobile information system comprising: a computer; a wireless communications interface that provides communications between the computer and a remote server over a wireless communications medium; a hyperlink browser that executes on the computer, the hyperlink browser sending resource requests to the remote server over the wireless communications medium; a positioning receiver that generates varying geographical coordinates indicating the varying location of the computer; wherein the hyperlink browser includes the varying geographical coordinates in at least some of the resource requests; wherein the remote server returns a valid zone specification in conjunction with returned geographically-dependent content, the valid zone specification indicating a geographical zone within which the returned geographically-dependent content is considered valid; and the hyperlink browser sends a new resource request when the computer leaves the geographical zone specified for particular returned geographically-dependent content. 11. A method of browsing hyperlinked content from a mobile browser, comprising; accepting a designation of hyperlinked content from a user; obtaining current geographical coordinates of the mobile browser; in response to the designation of hyperlinked content, sending a resource request to a server over a wireless transmission medium; including the current geographical coordinates in the resource request; wherein the server returns a valid zone specification in conjunction with returned geographically-dependent content, the valid zone specification indicating a geographical zone within which the returned geographically-dependent content is considered valid, the method comprising a further step of invalidating the returned geographically-dependent content when the computer leaves the geographical zone specified for the returned geographically-dependent content. 12. A method of browsing hyperlinked content from a mobile browser, comprising: accepting designation of hyperlinked content from a user; obtaining current geographical coordinates of the mobile browser; in response to the designation of hyperlinked content, sending a resource request to a server over a wireless transmission medium; including the current geographical coordinates in the resource request; wherein the server returns a valid zone specification in conjunction with returned geographically-dependent content, the valid zone specification indicating a geographical zone within which the returned geographically-dependent content is considered valid, the method comprising a further step of sending a new resource request when the computer leaves the geographical zone specified for particular returned geographically-dependent content. 13. A computer-readable storage medium containing instructions that are executable by a computer to perform steps comprising: receiving HTTP requests from a plurality of mobile clients, wherein the HTTP requests include geographical coordinates indicating locations of the mobile clients; in response to the HTTP requests, selecting geographical-dependent content based on the geographical coordinates included in the HTTP requests; returning the selected geographical-dependent content to the requesting mobile clients; and returning a valid zone specification in conjunction with the returned geographically-dependent content, the vali d zone specification indicating a geographical zone within which the returned geographically-dependent content is considered valid. 14. A computer-readable storage medium as recited in claim 13, wherein the valid zone specification is specified as a valid radius specification, the valid radius specification indicating a radius from the location of a mobile client within which the returned geographically-dependent content is considered valid. 15. A computer-readable storage medium as recited in claim 13, wherein the returned geographically-dependent content comprises a listing of mobile users in proximity to requesting mobile clients.16. A computer-readable storage medium as recited in claim 13, the steps further comprising: maintaining a database indicating current locations of different mobile clients based on the HTTP requests submitted by said clients; wherein the returned geographically-dependent content comprises listings of mobile clients that are in proximity to requesting mobile clients. 17. A method of servicing resource requests in a network having hyperlinked content, comprising the following steps: receiving resource requests from a plurality of mobile clients, wherein the resource requests include geographical coordinates indicating locations of the mobile clients; in response to the resource requests, selecting geographical-dependent content based on the geographical coordinates included in the resource requests; returning the selected geographical-dependent content to the requesting mobile clients; and returning a valid zone specification in conjunction with the returned geographically-dependent content, the valid zone specification indicating a geographical zone within which the returned geographically-dependent content is considered valid. 18. A method as recited in claim 17, wherein the valid zone specification is specified as a valid radius specification, the valid radius specification indicating a radius from the location of a mobile client within which the returned geographically-dependent content is considered valid. 19. A method as recited in claim 17, further comprising: maintaining a database indicating current locations of different mobile clients based on the HTTP requests submitted by said clients; wherein the returned geographically-dependent content comprises listings of mobile clients that are in proximity to requesting mobile clients. 20. A hyperlink content system, comprising; one or more servers having hyperlinked content, wherein at least some of the hyperlinked content is geographically-dependent; the servers being programmed to accept resource requests that specify geographical coordinates of mobile clients; the servers being programmed to respond to the resource requests by selecting and returning different geographically-dependent content depending on the specified geographical coordinates; wherein the servers are further programmed to return valid zone specifications in conjunction with the returned geographically-dependent content, each valid zone specification indicating a geographical zone within which the returned geographically-dependent content is considered valid. 21. A hyperlink content system as recited in claim 20, wherein each valid zone specification is specified as a valid radius specification, each valid radius specification indicating a radius from the location of a mobile client within which the returned geographically-dependent content is considered valid.22. A hyperlink content system as recited in claim 20, further comprising: a database indicating current locations of different mobile clients based on the HTTP requests submitted by said clients; wherein the returned geographically-dependent content comprises listings of mobile clients that are in proximity to requesting mobile clients. rnet Protocol) address for the duration of receipt of a traffic message; means for receiving messages from the GPRS network having the accepted IP address; means for de-capsulating received messages to retrieve signaling messages embedded therein; and means for altering states of a connection process within said MS in accordance with the retrieved signaling messages from the GPRS network having the accepted IP address. 2. The method of passing signaling messages from a TDMA (Time Division Multiple Access) MSC (Mobile Switching Center) to an MS (Mobile Station) comprising the steps of: assigning an IP (Internet Protocol) address to a MS when the MS registers; encapsulating signaling messages within an IP message; tunneling signaling messages over a GPRS network from the home TDMA MSC to a given MS; sending the assigned IP address to the home MSC of the MS; de-capsulating, at the given MS, the encapsulated signaling message within the received IP message from the GPRS network, wherein the signaling messages are generated by the home MSC; and altering states of a connection process within the MS in accordance with the retrieved signaling messages from the GPRS network generating the assigned IP address. 3. A cellular system for communicating GPRS (General Packet Radio Service) messages comprising: an MS (mobile station) having an IP address that can distinguish between received traffic and signaling messages; registering means for assigning an IP address to the MS when it registers for service; an MSC (Mobile Switching Center), having an IP address, for encapsulating signaling messages in IP (internet protocol) format to be sent for the control of any MS having that MSC as a home MSC; and means for altering states of a connection process within the MS in accordance with the retrieved signaling messages from the GPRS network generating the assigned IP address. 4. The apparatus of claim 3 comprising, in addition: encapsulating and de-capsulating means comprising part of said MS for sending control signals to and receiving control signals from the home MSC of said MS. 5. A method of providing control signaling messages from a home MSC (Mobile Switching Center) to an MS (mobile station) in a GPRS (General Packet Radio Service) messaging system integrated into a cellular network comprising: assigning an IP (Internet Protocol) address to a MS when the MS registers with the GPRS system; notifying the home MSC of the IP address of said MS; encapsulating control signal messages in IP format for controlling the MS directly from said home MSC over any intervening IP networks; means for accepting the IP address for the duration of receipt of a traffic message from the GPRS; and means for altering states of a connection process within the MS in accordance with retrieved signaling messages from the GPRS network having the accepted IP address. 6. An MS (Mobile Station) for use in a GPRS (General Packet Radio Service) network comprising: means for accepting an IP (Internet Protocol) address for the duration of receipt of a traffic message from the GPRS network; means for de-capsulating received IP format messages from a home MSC to retrieve signaling messages embedded therein; and means for altering states of a connection process within the MS in accordance with retrieved signaling messages from the GPRS network generating the accepted IP address. 7. A method of controlling an MS (Mobile Station) in a GPRS (General Packet Radio Service) network where the MS is located in a network remote from the home MSC (Mobile Switching Center) of that MS comprising the steps of: assigning an IP (Internet Protocol) address to an MS when it registers; notifying the home MSC of the IP address of said MS; and transmitting signaling communications between said MSC and said MS directly in IP format, wherein the signaling messages are generated by the home MSC; and altering states of a con