CA2344482A1 - Method for robust handoff in wireless communication system - Google Patents

Method for robust handoff in wireless communication system Download PDF

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Publication number
CA2344482A1
CA2344482A1 CA002344482A CA2344482A CA2344482A1 CA 2344482 A1 CA2344482 A1 CA 2344482A1 CA 002344482 A CA002344482 A CA 002344482A CA 2344482 A CA2344482 A CA 2344482A CA 2344482 A1 CA2344482 A1 CA 2344482A1
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CA
Canada
Prior art keywords
transceiver
mobile station
identification
base station
active set
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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
CA002344482A
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French (fr)
Other versions
CA2344482C (en
Inventor
Matthew S. Grob
Roberto Padovani
Paul Bender
Greg M. Hoagland
Robert H. Kimball
Gadi Karmi
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Qualcomm Inc
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Individual
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Publication of CA2344482A1 publication Critical patent/CA2344482A1/en
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Publication of CA2344482C publication Critical patent/CA2344482C/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/318—Received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data

Abstract

A communication system that allows a soft handoff to be completed, even when the communications link between the active base station and the mobile station deteriorates before the mobile station (101) has received the handoff direction message. The mobile station maintains a list of base stations that the mobile station (101) is in communication with, referred to as an "Active Set". In addition, the mobile station (101) maintains another list of base stations (300) that are proximate to the base stations (300) in the active set. This list is referred to as the "Neighbor Set". A memory within the mobile station (101) includes information that would allow the mobile station (101) to demodulate information transmitted from those base stations (300) on the neighbor set. In accordance with the disclosed method and apparatus, the mobile station (101) places a base station (300) in the active set upon including the base station (300) in a pilot strength measurement message (PSMM).

Claims (17)

1. A method of soft handoff comprising:
measuring at a mobile station, the power of signals transmitted by at least a first base station transceiver while a traffic channel between the mobile station and a second base station transceiver is being used for communication;
identifying to the second base station transceiver a first base station that is not currently in soft handoff with the mobile station and that has a signal power measured by the mobile station that is greater than a threshold;
and establishing a traffic channel between the first base station and the mobile station in response to identification of the first base station.
2. The method of claim 1 further comprising instructing the first base station transceiver to send data to the mobile station.
3. The method of claim 1 further comprising:
sending a resource allocation instruction;
wherein sending the resource allocation instruction includes advising the first base station transceiver by a system controller to prepare for communication with the mobile station.
4. The method of claim 1 further comprising sending a direction message from the first transceiver with which the mobile station is not in communication.
5. The method of claim 1 further comprising adding to an active set at the mobile station an identification for the first transceiver with which the mobile station is not in communication, wherein the active set prior to adding contains identifications of base station transceivers with which the mobile station is in communication.
6. The method of claim 1 further comprising receiving the direction message from the first base station transceiver with which the mobile station is not in communication.
7. The method of claim 1 further comprising:
adding to an active set at the mobile station an identification of the first base station transceiver with which the mobile station is not in communication; and receiving the direction message from the first base station transceiver with which the mobile station is not in communication.
8. The method of claim 1 further comprising:
adding to an active set at the mobile station an identification of the first base station transceiver with which the mobile station is not in communication;
receiving the direction message from the first base station transceiver with which the mobile station is not in communication; and removing from the active set any identification not matching at least one identification in the direction message.
9. The method of claim 1 further comprising:
adding to an active set at the mobile station an identification of the first base station transceiver;
receiving the direction message from the first base station transceiver;
removing from the active set any identification not matching at least one identification in the direction message; and initiating communication with the first base station transceiver.
10. The method of claim 1 further comprising:
adding to an active set at the mobile station an identification of the first base station transceiver;

wherein an identification of the at least one transceiver is an identification of a neighboring transceiver; and receiving the direction message from the first base station transceiver.
11. The method of claim 1 further comprising:
adding to an active set at the mobile station an identification of the first base station transceiver;
wherein an identification of the at least one transceiver includes an identification of a neighboring transceiver;
wherein the identification of a neighboring transceiver is provided by a system controller; and using the identifications in the active set to search for the direction message.
12. The method of claim 1 further comprising:
adding to an active set at the mobile station an identification of the first base station transceiver; and adding to an active set at the mobile station an identification of a neighboring transceiver.
13. The method of claim 1 further comprising:
adding to an active set at the mobile station an identification of the at least one transceiver with which the mobile station is not in communication; and adding to an active set at the mobile station an identification of a neighboring transceiver, wherein the identification of a neighboring transceiver is provided by a system controller.
14. The method of claim 1 further comprising:
adding to an active set at the mobile station an identification of the at least one transceiver with which the mobile station is not in communication;

adding to an active set at the mobile station an identification of at least one neighboring transceiver, wherein the identification of the at least one neighboring transceiver is provided by a system controller;
wherein searching includes searching for the direction message using the identifications of the active set; and receiving the direction message from the at least one neighboring transceiver.
15. The method of claim 1 further comprising:
adding to an active set at the mobile station an identification of the first base station transceiver;
adding to an active set at the mobile station an identification of at least one neighboring transceiver, wherein the identification of the at least one neighboring transceiver is provided by a system controller;
searching for the direction message using the identifications of the active set; and receiving the direction message from the first transceiver.
16. The method of claim 1, wherein the first base station transceiver provides coverage to a cell in a cellular system.
17. The method of claim 1, wherein the first base station transceiver provides coverage to a sector of a cell in a cellular system.
CA2344482A 1998-09-22 1999-09-22 Method for robust handoff in wireless communication system Expired - Lifetime CA2344482C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/158,665 1998-09-22
US09/158,665 US6360100B1 (en) 1998-09-22 1998-09-22 Method for robust handoff in wireless communication system
PCT/US1999/021759 WO2000018173A1 (en) 1998-09-22 1999-09-22 Method for robust handoff in wireless communication system

Publications (2)

Publication Number Publication Date
CA2344482A1 true CA2344482A1 (en) 2000-03-30
CA2344482C CA2344482C (en) 2011-07-12

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CA2344482A Expired - Lifetime CA2344482C (en) 1998-09-22 1999-09-22 Method for robust handoff in wireless communication system

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US (3) US6360100B1 (en)
EP (3) EP1765033B1 (en)
JP (3) JP4536926B2 (en)
KR (1) KR100696031B1 (en)
CN (2) CN100444680C (en)
AT (2) ATE447308T1 (en)
AU (1) AU764067B2 (en)
BR (1) BRPI9913883B1 (en)
CA (1) CA2344482C (en)
DE (2) DE69934502T2 (en)
ES (1) ES2332734T3 (en)
HK (2) HK1039015B (en)
ID (1) ID28725A (en)
IL (1) IL141971A0 (en)
NO (1) NO325668B1 (en)
RU (1) RU2233560C2 (en)
WO (1) WO2000018173A1 (en)

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