CA2256409A1 - Method and apparatus for providing diversity in hard handoff for a cdma system - Google Patents

Method and apparatus for providing diversity in hard handoff for a cdma system

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Publication number
CA2256409A1
CA2256409A1 CA002256409A CA2256409A CA2256409A1 CA 2256409 A1 CA2256409 A1 CA 2256409A1 CA 002256409 A CA002256409 A CA 002256409A CA 2256409 A CA2256409 A CA 2256409A CA 2256409 A1 CA2256409 A1 CA 2256409A1
Authority
CA
Canada
Prior art keywords
antenna
coverage area
remote unit
base station
active communication
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002256409A
Other languages
French (fr)
Other versions
CA2256409C (en
Inventor
Edward G. Tiedemann, Jr.
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=24612837&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2256409(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Individual filed Critical Individual
Publication of CA2256409A1 publication Critical patent/CA2256409A1/en
Application granted granted Critical
Publication of CA2256409C publication Critical patent/CA2256409C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/26—Cell enhancers or enhancement, e.g. for tunnels, building shadow
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/16—Deriving transmission power values from another channel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

In a communications network, a network user communicates using a remote unit (125) with another user (30) via at least one base station (B1A). The communications network has a first base station (B1A) having a first coverage area and a second base station (B2A) having a second coverage area. In the situation where communication is not established between the second base station (B2A) and the remote unit (125), in order to provide communication between the remote unit (125) and the first base station (B1A) when the remote unit (125) is in the first coverage and simultaneously in the second coverage area, the first base station (B1A) produces a first active communication signal as intended for the remote unit (125). The first base station transmits the first active communication signal from a first antenna (130). The base station delays the first active communication signal to produce a first delayed active communication signal and transmits it from a second antenna (135) wherein the second antenna (135) is oriented with respect to the first antenna (130) such that the first active communication signal and the first delayed active communication signal fade independently as perceived by the remote unit. The first base station (B1A) may measure a round trip delay of the first active communication signal in order to identify that the remote unit (125) is located within the second coverage area.

Claims (81)

1. In a communications network in which a network user communicates using a remote unit with another user via at least one base station, said communications network including a first base station having a first coverage area and a second base station having a second coverage area, a method for providing communications between said remote unit and said first base station when said remote unit is in said first coverage and simultaneously in said second coverage area and wherein communication is not established between said second base station and said remote unit, comprising the steps of:
producing a first active communication signal at said first base station intended for said remote unit;
transmitting from said first base station said first active communication signal from a first antenna;
delaying said first active communication signal to produce a first delayed active communication signal;
transmitting from said first base station said first delayed active communication signal from a second antenna wherein said second antenna is configured such that said first active communication signal and said first delayed active communication signal fade independently as perceived by said remote unit;
producing a second set of active communication signals at said second base station none of which are intended for said remote unit; and transmitting from said second base station said second set of active communication signals.
2. The method of Claim 1:
wherein said first active communication signal is a spread spectrum signal which is spread with a series of pseudorandom noise chips each chip of which has a fixed duration; and wherein in said step of delaying, said first active signal is delayed by at least said fixed duration.
3. The method of Claim 2 wherein said second set of active communication signals is modulated in an alternative communication technology.
4. The method of Claim 1 further comprising the step of transmitting said first active communication signal at an increased level compared to a set of other active signals transmitted from said first antenna because said remote unit is located in said second coverage area.
5. The method of Claim 1 further comprising the step of measuring at said first base station a round trip delay of said first active communication signal in order to identify that said remote unit is located in said second coverage area.
6. The method of Claim 1 further comprising the steps of:
measuring at said remote unit a signal level of said first active communication signal;
reporting by said remote unit said signal level to said first base station;
and determining from said signal level that said remote unit is located in said second coverage area.
7. The method of Claim 1 wherein said second antenna is located near or within said second coverage area and is not located at said base station.
8. The method of Claim 1 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
9. The method of Claim 1 wherein said step of transmitting from said first base station said first delayed active communication signal from said second antenna is performed only when at least one remote unit is located near said second coverage area.
10. The method of Claim 1 wherein said first delayed active communication signal is transmitted from said second antenna at a lower power level than said first active communication signal.
11. The method of Claim 10 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
12. The method of Claim 10 wherein said step of transmitting from said first base station said first delayed active communication signal from saidsecond antenna is performed only when at least one remote unit is located near said second coverage area.
13. The method of Claim 12 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
14. In a communications network in which a network user communicates using a remote unit with another user via at least one base station, said communications network including a first base station having a first coverage area and a second base station having a second coverage area, a method for providing communications between said remote unit and said first base station when said remote unit is in said first coverage and simultaneously in said second coverage area and wherein communication is not established between said second base station and said remote unit, comprising the steps of:
producing a first active communication signal at said first base station intended for said remote unit;
transmitting from said first base station said first active communication signal from a first antenna;
transmitting from said first base station said first active communication signal from a second antenna;
coupling together said first and second antennas to create said first coverage area; and changing over time the phase of said second antenna relative to the phase of a first antenna at a rate sufficient to reduce a signal fading loss perceived by said remote unit;
producing a second set of active communication signal at said second base station none of which are intended for said remote unit; and transmitting from said second base station said second set of active communication signals.
15. The method of Claim 14:
wherein said first active communication signal is a spread spectrum signal; and wherein said second set of active communication signals is modulated in an alternative communication technology.
16. The method of Claim 14 further comprising the step of transmitting said first active communication signal at an increased level compared to a set of other active signals transmitted from said first antenna because said remote unit is located in said second coverage area.
17. The method of Claim 14 further comprising the step of measuring at said first base station a round trip delay of said first active communicationsignal in order to identify that said remote unit is located in said second coverage area.
18. The method of Claim 14 further comprising the steps of:
measuring at said remote unit a signal level of said first active communication signal;
reporting by said remote unit said signal level to said first base station;
and determining from said signal level that said remote unit is located in said second coverage area.
19. The method of Claim 14 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
20. The method of Claim 14 further comprising the step of transmitting from said second antenna a pilot signal only when at least one remote unit is located within said second coverage area.
21. The method of Claim 14 further comprising the step of transmitting said first delayed active communication signal from said second antenna at a lower power level than said first active communication signal.
22. The method of Claim 14 further comprising the step of transmitting said second active communication signal from said second antenna only if said remote unit is located in said second coverage area.
23. The method of Claim 14 further comprising the step of transmitting from said second antenna a pilot signal.
24. The method of Claim 23 further comprising the step of transmitting from said first base station from said second antenna a page and sync channel signal.
25. The method of Claim 23 further comprising the step of transmitting said pilot signal from said second antenna at a different PN offset than a firstpilot signal transmitted from said first antenna.
26. In a communications network in which a network user communicates using a remote unit with another user via at least one base station, said network including a first base station having a first coverage area and a second base station having a second coverage area, a method for providing communications between said remote unit and said first base station when said remote unit is in said first coverage and simultaneously in said second coverage area and wherein communication is not established between said second base station and said remote unit, comprising the steps of:
producing a first active communication signal at said first base station intended for said remote unit;
transmitting from said first base station said first active communication signal from a first antenna;
producing a second active communication signal at said first base station intended for said remote unit;
transmitting from said first base station said second active communication signal from a second antenna wherein said second antenna is such that said first active communication signal and said second active communication signal fade independently as perceived by said remote unit and are separately receivable by said remote unit;
producing a set of active communication signal at said second base station none of which are intended for said remote unit; and transmitting from said second base station said set of active communication signals.
27. The method of Claim 26:
wherein said first active communication signal is a spread spectrum signal which is spread with a series of pseudorandom noise chips each chip of which has a fixed duration; and wherein said first and second active signals are separately receivable by said remote unit because said second active signal is offset in time from said first active signal by at least said fixed duration.
28. The method of Claim 26 wherein said set of active communication signals is modulated using time division multiple access.
29. The method of Claim 26 wherein said set of active communication signals is modulated using code division multiple access.
30. The method of Claim 26 wherein said set of active communication signals is frequency modulated.
31. The method of Claim 26 further comprising the step of transmitting said second active communication signal because said remote unit is located in said second coverage area.
32. The method of Claim 31 further comprising the step of measuring at said first base station a round trip delay of said first active communicationsignal in order to identify that said remote unit is located in said second coverage area.
33. The method of Claim 31 further comprising the steps of:
measuring at said remote unit a signal level of said first active communication signal; and reporting by said remote unit said signal level to said first base station in order to identify that said remote unit is located in said second coverage area.
34. The method of Claim 26 wherein said second antenna is located within said second coverage area.
35. The method of Claim 26 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
36. The method of Claim 26 further comprising the step of transmitting said first delayed active communication signal from said second antenna at a lower power level than said first active communication signal.
37. The method of Claim 36 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
38. The method of Claim 36 wherein said step of transmitting from said first base station said first delayed active communication signal from saidsecond antenna is performed only when at least one remote unit is located near said second coverage area.
39. The method of Claim 38 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
40. The method of Claim 26 further comprising the step of transmitting from said second antenna a pilot signal only when at least one remote unit is located within said second coverage area.
41. The method of Claim 26 further comprising the step of transmitting from said second antenna a pilot signal.
42. The method of Claim 41 further comprising the step of transmitting from said first base station from said second antenna a page and sync channel signal.
43. The method of Claim 41 wherein said pilot signal transmitted from said second antenna has a different PN offset than a first pilot signal transmitted from said first antenna.
44. A communications network comprising:
a first active base station defining a first coverage area comprising:
a first antenna producing a first active communication signal;
a second antenna producing a second active communication signal;
a delay line interposed between said first and said second antennas such that said second active communication signal is offset in time with respect to said first active communication signal;
a second target base station defining a second coverage area and producing a set of communication signals; and a remote unit located within said first and second coverage areas and receiving said first and second active communications signals.
45. The apparatus of Claim 44:
wherein said first and second active communication signals are spread spectrum signals which are spread with a series of pseudorandom noise chips each chip of which has a fixed duration; and wherein in said first active signal is offset from said second active communication signal by at least said fixed duration.
46. The apparatus of Claim 44 wherein said set of communication signals is modulated in an alternative communication technology.
47. The apparatus of Claim 44 wherein said second active communication signal is transmitted from said second antenna because said remote unit is located in said first and second coverage areas.
48. The apparatus of Claim 47 wherein said first active base station measures a round trip delay of said first active communication signal in order to identify that said remote unit is located in said second coverage area.
49. The apparatus of Claim 47 wherein said remote unit measures a signal level of said first active communication signal and reports said signal level to said first active base station in order to identify that said remote unit is located in said second coverage area.
50. The apparatus of Claim 44 wherein said second antenna is located near or within said second coverage and is not collocated with said first activebase station.
51. The apparatus of Claim 44 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
52. The apparatus of Claim 44 wherein said second antenna produces said second active communication signal only when at least one remote unit is located near or within said second coverage area.
53. The apparatus of Claim 44 wherein said second active communication signal is transmitted at a lower power level than said first active communication signal.
54. The apparatus of Claim 53 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
55. The apparatus of Claim 53 wherein said second active communication signal is produced by said second antenna is performed only when at least one remote unit is located near said second coverage area.
56. The apparatus of Claim 55 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
57. A communications network comprising:
a first active base station defining a first coverage area comprising:
a transmitter creating a first set of communication signals comprising a first active communication signal and creating a second set of communication signals comprising a second active communication signal;
a first antenna radiating said first set of communication signals;
a second antenna radiating said second set of communication signals;
a second target base station defining a second coverage area and producing a third set of communication signals; and a remote unit located within said first and second coverage areas and receiving said first and second active communications signals.
58. The apparatus of Claim 57:
wherein said first and second active communication signals are spread spectrum signals which are spread with a series of pseudorandom noise chips each chip of which has a fixed duration; and wherein said first active signal is delayed by at least said fixed duration.
59. The apparatus of Claim 57 wherein said third set of communication signals is modulated in an alternative communication technology.
60. The apparatus of Claim 57 wherein said second active communication signal is transmitted from said second antenna because said remote unit is located in said first and second coverage areas.
61. The apparatus of Claim 60 wherein said first active base station measures a round trip delay of said first active communication signal in order to identify that said remote unit is located in said second coverage area.
62. The apparatus of Claim 60 wherein said remote unit measures a signal level of said first active communication signal and reports said signal level to said active first base station in order to identify that said remote unit is located in said second coverage area.
63. The apparatus of Claim 57 wherein said second antenna is located near or within said second coverage and is not collocated with said first activebase station
64. The apparatus of Claim 57 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
65. The apparatus of Claim 57 wherein said second set of communication signals is radiated from said second antenna when at least one remote unit is located within said second coverage area.
66. The apparatus of Claim 57 wherein said second set of communication signals are radiated from said second antenna at a lower power level than said first set of communication signals are radiated from said first antenna.
67. The apparatus of Claim 66 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
68. The apparatus of Claim 66 wherein said second set of communication signals are radiated from said second antenna only when at least one-remote unit is located near said second coverage area.
69. The apparatus of Claim 68 wherein said second antenna is a highly directional spot antenna having a coverage area located near or within said second coverage area.
70. The apparatus of Claim 57 wherein said second antenna transmits a pilot signal only when at least one remote unit is located within said second coverage area.
71. The apparatus of Claim 57 wherein said second active communication signal is radiated from said second antenna only if said remote unit is located in said second coverage area.
72. The apparatus of Claim 57 wherein said second antenna radiates a pilot signal.
73. The apparatus of Claim 57 wherein said first base station from said second antenna radiates a page and sync channel signal.
74. The apparatus of Claim 57 wherein said pilot signal transmitted from said second antenna has a different PN offset than a first pilot signal transmitted from said first antenna.
75. A communications network comprising:
a first active base station defining a first coverage area comprising:
a first antenna producing a first active communication signal;
a second antenna producing a second active communication signal; and a phase vacillation mechanism interposed between said first and said second antennas such as to reduce signal fading loss perceived within said first coverage area;
a second target base station defining a second coverage area and producing a set of communication signals; and a remote unit located within said first and second coverage areas and receiving said first and second active communications signals.
76. The apparatus of Claim 75 wherein said set of communication signals is modulated in an alternative communication technology.
77. The apparatus of Claim 75 wherein said second active communication signal is transmitted from said second antenna because said remote unit is located in said first and second coverage areas.
78. The apparatus of Claim 77 wherein said first active base station measures a round trip delay of said first active communication signal in order to identify that said remote unit is located in said second coverage area.
79. The apparatus of Claim 77 wherein said remote unit measures a signal level of said first active communication signal and reports said signal level to said active first base station in order to identify that said remote unit is located in said second coverage area.
80. The apparatus of Claim 77 wherein said second active communication signal is radiated from said second antenna when at least one remote unit is located within said second coverage area.
81. The apparatus of Claim 77 wherein said second active communication signal are radiated from said second antenna at a lower power level than said first set of communication signals are radiated from said first antenna.
CA2256409A 1996-05-22 1997-05-22 Method and apparatus for providing diversity in hard handoff for a cdma system Expired - Fee Related CA2256409C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/651,430 1996-05-22
US08/651,430 US5926470A (en) 1996-05-22 1996-05-22 Method and apparatus for providing diversity in hard handoff for a CDMA system
PCT/US1997/008671 WO1997044983A2 (en) 1996-05-22 1997-05-22 Method and apparatus for providing diversity in hard handoff for a cdma system

Publications (2)

Publication Number Publication Date
CA2256409A1 true CA2256409A1 (en) 1997-11-27
CA2256409C CA2256409C (en) 2011-08-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2256409A Expired - Fee Related CA2256409C (en) 1996-05-22 1997-05-22 Method and apparatus for providing diversity in hard handoff for a cdma system

Country Status (14)

Country Link
US (1) US5926470A (en)
EP (1) EP0900512B1 (en)
JP (2) JP4191249B2 (en)
CN (1) CN1158889C (en)
AT (1) ATE302535T1 (en)
AU (1) AU3209197A (en)
BR (1) BR9712090A (en)
CA (1) CA2256409C (en)
DE (1) DE69733997T2 (en)
HK (1) HK1018874A1 (en)
IL (1) IL127171A (en)
TW (1) TW361021B (en)
WO (1) WO1997044983A2 (en)
ZA (1) ZA974384B (en)

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