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Title:
SYSTEM AND METHOD FOR SINGLE-POINT TO FIXED-MULTIPOINT DATA COMMUNICATION
Document Type and Number:
WIPO Patent Application WO/2000/041543
Kind Code:
A2
Abstract:
Systems and methods for single-point to fixed-multipoint communication. The invention dynamically allocates bandwidth based on traffic demands, thus providing efficient bandwidth utilization, particularly with bursty or time sensitive data traffic. A system includes a Base Station and a plurality of Remote Stations. The Base Station transmits information to the Remote Stations via a Forward Channel and the Remote Stations transmit information via a Reverse Channel. Before transmitting on the Reverse Channel, each of the Remote Stations listens (monitors) the Reverse Channel to ascertain whether any other Remote Station is transmitting. Remote Stations transmit data only when a Remote Station determines that the channel is clear. The Remote Stations listen in sequential order, eliminating the probability of collisions caused by simultaneous transmissions from Remote Stations. The data traffic is accordingly aggregated, thus providing efficient bandwidth utilization.

Inventors:
MARGON KENNETH
Application Number:
PCT/US2000/000844
Publication Date:
July 20, 2000
Filing Date:
January 14, 2000
Export Citation:
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Assignee:
EMBEDDED WIRELESS INTERNATIONA (US)
International Classes:
H04L12/28; H04L12/56; H04L29/06; H04W72/04; H04W24/00; H04W28/04; H04W74/00; (IPC1-7): H04Q7/00
Domestic Patent References:
WO1998049850A11998-11-05
WO1998018282A21998-04-30
WO1998037669A11998-08-27
WO1998038757A11998-09-03
WO1994017642A11994-08-04
Foreign References:
US5682604A1997-10-28
GB2259387A1993-03-10
US5796729A1998-08-18
EP0556012A21993-08-18
US5732074A1998-03-24
US5678186A1997-10-14
US5386435A1995-01-31
EP0483545A11992-05-06
US5602836A1997-02-11
US5818829A1998-10-06
US5805576A1998-09-08
US5745484A1998-04-28
Other References:
SABRETOOTHED: "CAG QUALCOM (CDMA vs IDMA)" INTERNET, 4 January 2000 (2000-01-04), page 1-12 XP002141571
R. WISE: "Cape Range announcement - IPMA works" INTERNET, [Online] 6 August 1999 (1999-08-06), page 1 XP002141572 Retrieved from the Internet: [retrieved on 2000-06-29]
Attorney, Agent or Firm:
Carrano, Cono A. (Phleger & Harrison LLP, Intellectual Property Dpt., Suite 800, 1333 H Street, N, Washington DC, US)
Download PDF:
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Claims:
What is claimed is:
1. A system, comprising: a base station capable of providing a forward channel signal; and a remote station capable of monitoring for said forward channel signal, monitoring a reverse channel during a clear channel assessment interval, and providing a reverse channel signal when said reverse channel is clear.
2. The system of claim 1, wherein said base station is capable of receiving information encoded on said reverse channel and wherein said remote station is capable of receiving information encoded on said forward channel.
3. The system of claim 1, wherein said forward channel signal and said reverse channel signal include data packets.
4. The system of claim 3, wherein said data packets include digitized voice and data.
5. The system of claim 1, wherein said forward channel includes an address.
6. The system of claim 5, wherein said remote station is assigned a unique remote station address and wherein said remote station is capable of accepting information encoded on said forward channel when said address of said forward channel matches said assigned unique remote station address.
7. The system of claim 5, wherein a remote station address is assigned a priori to said remote station.
8. The system of claim 5, wherein said address is a broadcast address.
9. The system of claim 5, wherein said address is a semibroadcast address.
10. The system of claim 5, wherein said address corresponds with an Internet Protocol address.
11. The system of claim 5, wherein said address is an Internet Protocol address.
12. The system of claim 5, wherein said remote station is assigned a first remote station address from a first set of addresses and another remote station is assigned a second remote station address from a second set of addresses.
13. The system of claim 12, wherein said first set of address form a first zone and said second set of addresses form a second zone.
14. The system of claim 5, wherein said remote station is assigned a remote station address from a set of addresses and said set of addresses form an Internet sub network.
15. The system of claim 1, wherein said clear channel assessment interval includes predetermined dwell times and wherein said remote station monitors said clear assessment channel during an assigned dwell time.
16. The system of claim 15, wherein each of said dwell times is of equal duration.
17. The system of claim 15, wherein said remote station is dynamically assigned a dwell time.
18. The system of claim 17, wherein said dwell times are assigned to said remote station and another remote station in a round robin fashion.
19. The system of claim 1, wherein said forward channel signal is provided during a predetermined forward channel interval and said reverse channel signal is provided during a predetermined reverse channel interval.
20. The system of claim 19, further comprising guard times among said forward channel interval, said reverse channel interval, and said clear channel assessment interval.
21. The system of claim 20, wherein said guard times are positioned at the beginning and end of said forward channel interval, said reverse channel interval, and said clear channel assessment interval.
22. The system of claim 20, wherein said guard times are positioned at the beginning and end of said forward channel interval and at the end of said reverse channel interval and said clear channel assessment interval.
23. The system of claim 1, wherein the system is an Internet Protocol Multiple Access environment.
24. The system of claim 1, wherein said forward channel signal and said reverse channel signal are wireless signals.
25. The system of claim 24, wherein said forward channel signal and said reverse channel signal are modulated signals each having carrier signals with a frequency of approximately 2 GHz.
26. The system of claim 1, wherein said forward channel signal and said reverse channel signal are each electrical signals transmitted in an electrical medium.
27. The system of claim 1, wherein said forward channel signal and said reverse channel signal are each optical signals transmitted in an optical medium.
28. The system of claim 1, wherein said forward channel signal and reverse channel signal are halfduplex signals.
29. The system of claim 1, wherein said forward channel signal and reverse channel signal are fullduplex signals.
30. The system of claim 1, wherein said base station is capable of synchronizing with said remote station.
31. The system of claim 30, wherein said base station uses broadcast control packets for synchronization.
32. A method for a singlepoint to a fixed multipoint system having a base station and a plurality of remote stations, the method comprising the step of : transmitting from the base station a forward channel signal; monitoring for said forward channel signal at each of the plurality of remote stations; and monitoring a reverse channel at each of the plurality of remote stations, wherein each of the plurality of remote stations monitors at an assigned predetermined time within a clear assessment interval, if said reverse channel is clear during an assigned predetermined time associated with one of the plurality of remote stations and said one of the plurality remote stations has information to send the base station, transmitting a reverse channel signal from said one of the plurality of remote stations.
33. The method of claim 32, wherein said forward channel signal has data information and address information.
34. The method of claim 33, further comprising the steps of assigning a unique remote station address to each of the plurality of remote stations and accepting said data information at one of the plurality of remote stations when said address matches an unique address of said one of the plurality of remote stations.
35. The method of claim 34, wherein said step of assigning unique remote address is done a priori.
36. The method of claim 33, wherein said address information is a broadcast address.
37. The method of claim 33, wherein said address information is an Internet Protocol address.
38. The method of claim 33, further comprising the steps of assigning a first remote station address from a first set of addresses to one of the plurality of remote stations and assigning a second remote station address from a second set of addresses to another of the plurality of remote stations.
39. The method of claim 38, wherein said first set of address form a first zone and said second set of addresses form a second zone.
40. The method of claim 33, wherein said forward channel signal and said reverse channel signal include data packets.
41. The method of claim 40, wherein said data packets include digitized voice and data.
42. The method of claim 32, wherein said predetermined time is a dwell time and said channel assessment interval is partitioned into dwell times.
43. The method of claim 42, wherein each of said dwell times is of equal duration.
44. The method of claim 42, further comprising the step of dynamically assigning dwell times to each of the plurality of remote stations.
45. The method of claim 44, wherein said dwell times are assigned in a round robin fashion.
46. The method of claim 32, wherein said forward channel signal is provided during a predetermined forward channel interval and said reverse channel signal is provided during a predetermined reverse channel interval.
47. The method of claim 46, further comprising the step of providing guard times among said forward channel interval, said reverse channel interval, and said clear channel assessment interval.
48. The method of claim 47, wherein said guard times are positioned at the beginning and end of said forward channel interval, said reverse channel interval, and said clear channel assessment interval.
49. The method of claim 32, wherein the system is used in an Internet Protocol Multiple Access environment.
50. The method of claim 32, wherein said forward channel signal and said reverse channel signal are wireless signals.
51. The method of claim 32, wherein said forward channel signal and reverse channel signal are halfduplex signals.
52. The method of claim 32, wherein said forward channel signal and reverse channel signal are fullduplex signals.
53. The method of claim 32, further comprising the step of synchronizing the base station with the plurality of remote stations.
54. The method of claim 53, wherein broadcast control packets are used for synchronization.
55. A singlepoint to a fixed multipoint system, comprising: base station means for transmitting a forward channel signal ; and remote station means for monitoring for said forward channel signal, monitoring a reverse channel at an assigned predetermined time within a clear assessment interval, and transmitting a reverse channel signal wherein said means transmits said reverse channel signal after detecting that said reverse channel is clear during said predetermined time.
56. The system of claim 55, wherein said forward channel signal has data information and address information.
57. The system of claim 56, wherein said remote station means has a unique remote station address and said remote station means accepts said data information when said address information matches said unique address.
58. The system of claim 56, wherein said remote station means has a first remote station address from a first set of addresses and a second remote station means has a second remote station address from a second set of addresses.
59. The system of claim 57, wherein said first set of address form a first zone and said second set of addresses form a second zone.
60. The system of claim 56, wherein said address information is a broadcast address.
61. The system of claim 56, wherein said forward channel signal and said reverse channel signal include data packets.
62. The system of claim 55, wherein said predetermined time is a dwell time and said channel assessment interval is partitioned into dwell times.
63. The system of claim 55, wherein said forward channel signal is provided during a predetermined forward channel interval and said reverse channel signal is provided during a predetermined reverse channel interval.
64. The system of claim 63, further including guard times among said forward channel interval, said reverse channel interval, and said clear channel assessment interval.
65. The system of claim 64, wherein the system is used in an Internet Protocol Multiple Access environment.
66. The system of claim 55, wherein said forward channel signal and said reverse channel signal are wireless signals.
67. The system of claim 55, wherein said forward channel signal and reverse channel signal are fullduplex signals.
Description:
INTERNATIONALSEARCHREPORT j------------------) InteonalApplicationNo PCT/US00/00844 C.(Continuation)DOCUMENTSCONSIDEREDTOBERELEVANT CategoryCitationofdocument,withindication,whereappropriate,o ftherelevantpassagesRelevanttoclaimNo. 36-39, 41,47, 49,54, 58-60,64 A 9,14,21, 22,48,65 XGB2259387A(MOTOROLAISRAELLTD)1-3,5,7, 10March1993(1993-03-10)15, 19, 24-26, 28,30, 32-35, 40,42, 46,50, 51,53, 55-57, 61-63,66 page 1,line5-page4,line14 410818 y 4, 8, 10-13, 20,23, 27,31, 36-39, 41,44, 45,47, 49,54, 58-60,64 A 9,14,16, 21,22, 29,43, 48,52, 65,67 YWO9849850A(HOMEWIRELESSNETWORKSINC)4,10,11, 5November1998(1998-11-05)26,27, 29,41 abstract page1,line10-page5,line30 page7,line14-line28 page9,line30-page10,line19 page11,line22-page12,line5 page16,line18-line25 page17,line29-page18,line8 page20,line30-page21,line9 1-3, 5-9, A 1-3, 5-9, 12, 14, 28-30, 32-34, 36,38, 40,55 4 INTERNATIONALSEARCHREPORT Inte onal ApplicationNo PCT/US00/00844 C.(Continuation)DOCUMENTSCONSIDEREDTOBERELEVANT CategoryCitation of documentwithindication,whereappropriate,oftherelevantpassage sRelevanttoclaim No. Y US5796729A(GREANEYSHAUNJETAL)4,26,41 18August1998(1998-08-18) abstract column1,line7-column3,line53 column5,line21-column6,line18 column7,line22-line40 A1,3,28, 29,32, 33,40, 51,52, 55,67 YEP0556012A(MATSUSHITAELECTRICINDCO10,11, LTD)18August1993(1993-08-18)36,37 column1,line5-column11,line12 A1,5,32, 33,55 YUS5732074A(BRAITBERGMICHAELFET10,11,37 AL)24March1998(1998-03-24) column1,line11-column5,line19 column11,line27-line57 column12,line39-column13,line56 A1,5, 32, 33,55 YWO9818282A(NORTHERNTELECOMLTD12,13, ;BOPPANAJYOTI(US);SIDESSTEVE(US);38,39, DOCTOR)30April1998(1998-04-30)58,59 page1,line7-page4,line12 page6,line3-page7,line3 page8,line13-page9,line11 page19,line3-line9 claim1 A1,5,32, 33,55-57 YUS5678186A(LEEWILLIAMCY)12,13, 14October1997(1997-10-14)38,39, 58,59 abstract column1,line13-column4,line32 column5,line30-line59 claims1,10 A1,5,32, 33,55-57 4 INTERNATIONALSEARCHREPORT Inte, onal ApplicationNo PCT/US00/00844 C.(Continuation)DOCUMENTSCONSIDEREDTOBERELEVANT CategoryCitationofdocument,withindication,whereappropriate,o ftherelevantpassagesRelevanttoclaimNo. YWO9837669A(ERICSSONTELEFONABLM)31,54 27August1998(1998-08-27) page1,line2-page4,line17 page7,line5-page10,line26 page16,line3-line22 page17,line17-page18,line23 page19,line19-line30 A 1,30,32, 53,55 YUS5386435A(COOPERWBURCHALLETAL)36 31January1995(1995-01-31) column1,line10-column9,line61 A 1, 32,33, 55 YWO9838757A(MOTOROLAINC)36 3September1998(1998-09-03) page1,line7-page6,line8 page11,line30-page12,line15 page13,line21-line26 page15,line20-page16,line2 page19,line29-page23,line34 A 1, 32,33, 55 P,YSABRETOOTHED:"CAGQUALCOM(CDMAvs23,29 IDMA)" INTERNET, 4January2000(2000-01-04),page1-12 XP002141571 thewholedocument A 1,25,32 P,YR.WISE:"CapeRangeannouncement-IPMA23,49 works" INTERNET,'Online! 6August1999(1999-08-06),page1 XP002141572 RetrievedfromtheInternet: <URL:http://egoli. atwww.com.au/forum/archi ves/7659.html>'retrievedon2000-06-29! thewholedocument A 1, 25,32 YEP0483545A(IBM)17,18, 6May1992(1992-05-06)44,45 column1,line1-column4,line26 column7,line42-column9,line8 column14,line10-line23 A 1,15,16, 32,42, 43,55 4 INTERNATIONALSEARCHREPORT Inte onal ApplicationNo PCT/US00/00844 C.(Continuation)DOCUMENTSCONSIDEREDTOBERELEVANT Category°Citationofdocument,withindication,whereappropriate ,oftherelevantpassagesRelevanttoclaimNo. YWO9417642A(NOKIATELECOMMUNICATIONSOY17,18, ;TOEYRYLAEHANNU(FI))44,45 4August1994(1994-08-04) page1,line5-page7,line6 page9,line11-line27 A 1,15,16, 32,42, 43,55 YUS5602836A(PAPADOPOULOSHARALABOSC17,18, ETAL)11February1997(1997-02-11)44,45 abstract column1,line16-column2,line67 column3,line41-column4,line32 column7,line36-line55 A 1,15,16, 32,42, 43,55 YUS5818829A(ANDERSSONKARL-ERIKET20,47,64 AL)6October1998(1998-10-06) column1,line6-column11,line25 column11,line64-column13,line3 A1,19,21, 22,32, 46,48, 55,63,65 YUS5805576A(COATESKARENEVELYNET20,47,64 AL)8September1998(1998-09-08) column1,line22-column6,line6 column7,line42-line59 column12,line46-column13,line2 claims 1,3-5,7,8,11-13,15-17,19,20,23,24,26-28,30 ,31,34 claims36-38,40,41,60,61 YUS5745484A(SCOTTLOGAN)20,47,64 28April1998(1998-04-28) column1,line8-column5,line27 column7,line53-column10,line67 column12,line35-line55 column13,line34-column14,line9 A1,19,21, 22,32, 46,48, 55,63,65 4 li.._nationalapplicationNo. INTERNATIONALSEARCHREPORTPCT/US00/00844 Box IObservationswherecertainclaimswerefoundunsearchable(Continu ationofitem1offirstsheet) ThisInternationalSearchReporthasnotbeenestablishedinrespecto fcertainclaimsunderArticle17(2)(a)forthefollowingreasons: 1.ClaimsNos.: becausetheyrelatetosubjectmatternotrequiredtobesearchedbythi sAuthority,namely: 2.ClaimsNos.: becausetheyrelatetopartsoftheInternationalApplicationthatdon otcomplywiththeprescribedrequirementstosuch anextentthatnomeaningfulInternationalSearchcanbecarriedout,s pecifically: 3.ClaimsNos.: becausetheyaredependentclaimsandarenotdraftedinaccordancewit hthesecondandthirdsentencesofRule6.4(a). Box11Observationswhereunityofinventionislacking(Continuation ofitem2offirstsheet) ThisInternationalSearchingAuthorityfoundmultipleinventionsin thisinternationalapplication,asfollows: seeadditionalsheet 1.As allrequiredadditionalsearchfeesweretimelypaidbytheapplicant, thisInternationalSearchReportcoversall searchableclaims. 2.As allsearchableclaimscouldbesearchedwithouteffortjustifyingana dditionalfee,thisAuthoritydidnotinvitepayment ofanyadditionalfee. 3.n Asonlysomeoftherequiredadditionalsearchfeesweretimelypaidbyt heapplicant,thisInternationalSearchReport coversonlythoseclaimsforwhichfeeswerepaid,specificallyclaims Nos.: 4.nj Norequiredadditionalsearchfeesweretimelypaidbytheapplicant.C onsequently,thisInternationalSearchReportis restrictedtotheinventionfirstmentionedintheclaims;itiscovere dbyclaimsNos.: RemarkonProtestThe additionalsearchfeeswereaccompaniedbytheapplicant'sprotest. u vNoprotestaccompaniedthepaymentofadditionalsearchfees. u FURTHER INFORMATION CONTINUED FROM PCT/ISA/210 This International Searching Authority found multiple (groups of) inventions in this international application, as follows: 1. Claims: 1-16,19,23-43,46,49-63,66,67, as far as relating to the first invention A system providing for remote station access to a reverse channel, where remote stations monitor said reverse channel during predetermined and assigned monitoring intervals, where said stations access said reverse channel when said channel is clear, and where different stations are assigned addresses from different sets of allocatable addresses.

2. Claims: 1,15,17,18,32,42,44,45, as far as relating to the second invention A system providing for remote station access to a reverse channel, where remote stations monitor said reverse channel during predetermined and assigned monitoring intervals, where said stations access said reverse channel when said channel is clear, and where said predetermined monitoring intervals are dynamically allocated.

3. Claims: 1,19-22,32,46-48,55,63-65, as far as relating to the third invention A system providing for remote station access to a reverse channel, where remote stations monitor said reverse channel during predetermined and assigned monitoring intervals, where said stations access said reverse channel when said channel is clear, and where specific guard times are used between different intervals; INTERNATIONALSEARCHREPORT Inte onal ApplicationNo ) nformat ! ononpatentfami) ymembers,., PatentdocumentPublication Patent citedin searchreportdate member(s)date US5682604A28-10-1997GB 2293943A,B 10-04-1996 GB2259387A10-03-1993AU 654369 B 03-11-1994 AU 2084992 A 11-03-1993 CA 2075524 A 08-03-1993 HK 1000620 A 09-04-1998 IL 102715 A 31-10-1995 NZ 244168 A 26-10-1994 US 5481541 A 02-01-1996 WO9849850A05-11-1998US 6058104 A 02-05-2000 AU 6682198 A 24-11-1998 BR 9804867 A 24-08-1999 CA 2255596 A 05-11-1998 EP 0909521 A 21-04-1999 US5796729A18-08-1998AU 6280096 A 19-11-1997 CA 2252473 A 06-11-1997 CN 1229544 A 22-09-1999 JP 2000504192 T 04-04-2000 WO 9741650 A 06-11-1997 EP0556012A18-08-1993JP 5227161 A 03-09-1993 JP 6095998 A 08-04-1994 JP 6149689 A 31-05-1994 US 5517618 A 14-05-1996 US 5845079 A 01-12-1998 US5732074A24-03-1998AU 1525197 A 11-08-1997 CA 2243454 A 24-07-1997 EP 0875111 A 04-11-1998 WO 9726750 A 24-07-1997 WO9818282A30-04-1998US 5930714 A 27-07-1999 EP 0935899 A 18-08-1999 US5678186A14-10-1997US 5504936 A 02-04-1996 US 5243598 A 07-09-1993 US 5983118 A 09-11-1999 WO 9426074 A 10-11-1994 US 5479397 A 26-12-1995 EP 0578741 A 19-01-1994 JP 6506335 T 14-07-1994 WO 9217954 A 15-10-1992 WO9837669A27-08-1998AU 6315498 A 09-09-1998 US5386435A31-01-1995US 5287384 A 15-02-1994 CA 2108389 A 16-04-1994 DE 593289 T 17-11-1994 EP 0593289 A 20-04-1994 EP 0697772 A 21-02-1996 ES 2077544 T 01-12-1995 JP 7038469 A 07-02-1995 MX 9306438 A 31-05-1994 WO9838757A03-09-1998US 5878038 A 02-03-1999 EP 0962067 A 08-12-1999 INTERNATIONAL SEARCH REPORT Ints onal ApplicationNo informationonpatentfamily members PCT/US 00/00844 PatentdocumentPublication Patent family Publication citedinsearchreportdate member(s)date EP0483545A06-05-1992US 5239673 A 24-08-1993 DE 69110833 D 03-08-1995 DE 69110833 T 22-02-1996 JP 2839764 B 16-12-1998 JP 4227148 A 17-08-1992 WO9417642A04-08-1994FI 92365 B 15-07-1994 AU 673717 B 21-11-1996 AU 5886294 A 15-08-1994 CN 1119901 A 03-04-1996 EP 0681778 A 15-11-1995 JP 8505990 T 25-06-1996 US 5901363 A 04-05-1999 US5602836A11-02-1997US 5420851 A 30-05-1995 CA 2162938 A 28-06-1996 EP 0720321 A 03-07-1996 JP 8274740 A 18-10-1996 CA 2135950 A 25-05-1995 EP 0654916 A 24-05-1995 FI 945507 A 25-05-1995 JP 7203545 A 04-08-1995 NO 944404 A 26-05-1995 US 5594720 A 14-01-1997 US5818829A06-10-1998AU 7453196 A 07-05-1997 WO 9715156 A 24-04-1997 US5805576A08-09-1998US 5715516 A 03-02-1998 AU 2801797 A 12-11-1997 CA 2251910 A 30-10-1997 EP 0894413 A 03-02-1999 WO 9740639 A 30-10-1997 US 6112058 A 29-08-2000 AU 7476796 A 07-05-1997 CA 2234623 A 24-04-1997 CN 1203725 A 30-12-1998 EP 0856230 A 05-08-1998 JP 2000509565 T 25-07-2000 WO 9715159 A 24-04-1997 US5745484A28-04-1998AU 6025796 A 24-12-1996 BR 9608548 A 06-07-1999 CA 2223321 A 12-12-1996 CN 1192300 A 02-09-1998 EP 0873593 A 28-10-1998 WO 9639749 A 12-12-1996 US 6049538 A 11-04-2000




 
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