CA2517736A1 - System and method for determining a handover at a base station request in a broadband wireless access communication system - Google Patents

System and method for determining a handover at a base station request in a broadband wireless access communication system Download PDF

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Publication number
CA2517736A1
CA2517736A1 CA002517736A CA2517736A CA2517736A1 CA 2517736 A1 CA2517736 A1 CA 2517736A1 CA 002517736 A CA002517736 A CA 002517736A CA 2517736 A CA2517736 A CA 2517736A CA 2517736 A1 CA2517736 A1 CA 2517736A1
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Prior art keywords
handover
base station
neighbor base
base stations
cinr
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Granted
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CA002517736A
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French (fr)
Other versions
CA2517736C (en
Inventor
So-Hyun Kim
Chang-Hoi Koo
Jung-Je Son
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Samsung Electronics Co Ltd
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Individual
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Publication of CA2517736A1 publication Critical patent/CA2517736A1/en
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Publication of CA2517736C publication Critical patent/CA2517736C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0083Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085Hand-off measurements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0055Transmission or use of information for re-establishing the radio link
    • H04W36/0061Transmission or use of information for re-establishing the radio link of neighbour cell information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point

Abstract

A broadband wireless access communication system in which a subscriber stati on (SS) sends a serving base station (SBS) a handover request to neighbor base stations (NBSs) having a CINR satisfying a handover condition, in response t o a handover scan request message, and performs the handover to a particular N BS that transmits a handover response. The SBS transmits the handover scan request message to the SS, sends a handover connection request to NBSs in an order determined by CINRs reported from the SS, and sends, to the SS, information on a particular NBS upon receiving a handover connection respons e with ACK information from the particular NBS. The particular NBS determines whether it can support handover of the SS, in response to the handover connection request, and sends the handover connection response with the ACK information to the SBS, if it can support handover of the SS.

Claims (19)

1. A method for performing a handover by a subscriber station at a request of a serving base station in a broadband wireless access communication system including the serving base station for providing a service to the subscriber station and a plurality of neighbor base stations being adjacent to the serving base station, the method comprises the steps of:
receiving information on the neighbor base stations from the serving base station;
measuring carrier-to-interference and noise ratios (CINRs) of frequency bandwidth signals from the neighbor base stations based on the information on the neighbor base stations;
receiving a handover scan request message from the serving base station;
transmitting to the serving base station a handover request message including information on the measured CINRs of the neighbor base stations;
receiving, from the serving base station, information on at least one target base station capable of supporting the handover of the subscriber station among the neighbor base stations; and performing the handover from the serving base station to one of the at least one target base stations.
2. The method of claim 1, wherein the information on the neighbor base stations is included in a DL_MAP (Downlink MAP) message received from the serving base station.
3. The method of claim 1, wherein the information on the measured CINRs of the neighbor base stationsincludes only information on neighbor base stations satisfying a predetermined handover condition.
4. The method of claim 3, wherein the predetermined handover condition comprises:
a first handover condition, in which a CINR of a particular neighbor base station should not remain lower than a minimum CINR for a maximum holding time;
and a second handover condition, in which a highest CINR of a particular neighbor base station should remain higher than a measured CINR of the serving base station for a minimum holding time, wherein if there is a CINR satisfying the second handover condition among the measured CINRs of the neighbor base stations, the subscriber station requests handover to a neighbor base station corresponding to a CINR satisfying the first handover condition.
5. The method of claim 4, further comprising the step of suspending CINR measurement on neighbor base stations with CINRs not satisfying the first handover condition, among the measured CINRs of the neighbor base stations.
6. The method of claim 1, wherein the handover request message is transmitted to the serving base station along with the CINRs of the neighbor base stations, a quality of service (QoS), and a bandwidth.
7. The method of claim 6, wherein CINRs of neighbor base stations not including the target base station, from the neighbor base stations, are set to '0'.
8. A method for performing a handover from a serving base station to one of the at least one target base stations at the serving base station request in a broadband wireless access communication system including the serving base station for providing a service to the subscriber station and a plurality of neighbor base stations being adjacent to the serving base station the method comprises the steps of:
receiving information on the neighbor base stations from the serving base station;
measuring carrier-to-interference and noise ratios (CINRs) of frequency bandwidth signals from the neighbor base stations based on the information on the neighbor base stations;
receiving the handover request message from the serving base station; and transmitting to the serving base station a handover response message.
9. A method for performing a handover by a serving base station in a broadband wireless access communication system including the serving base station for providing a service to a subscriber station and a plurality of neighbor base stations being adjacent to the serving base station, the method comprising the steps of:

(a) transmitting a handover scan request message to the subscriber station, if a handover of the subscriber station is required;
(b) receiving carrier-to-interference and noise ratios (CINRs) of the neighbor base stations from the subscriber station in response to the handover scan request message;
(c) sorting the neighbor base stations in order determined by the received CINR
levels;
(d) sequentially sending a handover connection request to the neighbor base stations in the sorted order; and (e) transmitting information on a particular neighbor base station to the subscriber station upon receiving a handover connection response including ACK
(Acknowledgement) information from the particular neighbor base station in response to the handover connection request.
10. The method of claim 9, wherein the step (d) comprises sending the handover connection request to the neighbor base stations according to an order beginning with a neighbor base station corresponding to a highest CINR to a neighbor base station corresponding to a lowest CINR, until the handover connection response including the ACK information is received.
11. The method of claim 9, further comprising the step of receiving a handover request from the subscriber station, including measured CINRs of the neighbor base stations, a quality of service (QoS), and a bandwidth.
12. The method of claim 11, wherein the handover connection request is transmitted to the neighbor base stations including the QoS and the bandwidth.
13. The method of claim 9, wherein the information on the particular neighbor base station includes an identifier and a carrier frequency of the particular neighbor base station.
14. The method of claim 9, further comprising the step of transmitting a handover connection confirm message to the particular neighbor base station, upon receiving the handover connection response message including the ACK
information from the particular neighbor base station.
15. The method of claim 9, further comprising the step of releasing a link connected to the subscriber station, after transmitting the information on the particular neighbor base station.
16. A broadband wireless access communication system comprising:
a subscriber station for transmitting a request for a handover to at least one neighbor base station having a carrier-to-interference and noise ratio (CINR) satisfying a handover condition, in response to a handover scan request message, and performing the handover to a particular neighbor base station of the at least one neighbor base stations that transmits a handover response in response to a handover request;
a serving base station, which is currently in communication with the subscriber station, for receiving the request for the handover, transmitting the handover scan request message to the subscriber station, if handover of the subscriber station is required, sending a handover connection request to the neighbor base stations in an order determined by CINRs reported from the subscriber station, and sending, to the subscriber station, handover information, upon receiving a handover connection response including ACK (Acknowledgement) information; and a particular neighbor base station from the at least one neighbor base stations for determining whether it can support the handover of the subscriber station, in response to the handover connection request, and sending the handover connection response including the ACK information to the serving base station, if it can support the handover of the subscriber station.
17. The broadband wireless access communication system of claim 16, wherein the handover condition comprises:
a first handover condition, in which a CINR of the particular neighbor base station should not remain lower than a minimum CINR for a maximum holding time;
and a second handover condition, in which a highest CINR of the particular neighbor base station should remain higher than a measured CINR of the serving base station for a minimum holding time, wherein if there is a CINR satisfying the second handover condition among measured CINRs of the at least one neighbor base stations, the subscriber station requests a handover to a neighbor base station corresponding to a CINR
satisfying the first handover condition.
18. The broadband wireless access communication system of claim 17, wherein CINR measurement on neighbor base stations with CINRs not satisfying the first handover condition among the measured CINRs of the neighbor base stations, is suspended.
19. The broadband wireless access communication system of claim 18, wherein the subscriber station sends the handover request to the serving base station, if at least one of the measured CINRs of the at least one neighbor base stations is higher than a predetermined threshold and a CINR of the serving base station.
CA2517736A 2003-03-08 2004-03-05 System and method for determining a handover at a base station request in a broadband wireless access communication system Expired - Fee Related CA2517736C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020030014643A KR100640344B1 (en) 2003-03-08 2003-03-08 System and method for handover of base station in a broadband wireless access communication system
KR10-2003-0014643 2003-03-08
PCT/KR2004/000470 WO2004079949A1 (en) 2003-03-08 2004-03-05 System and method for determining a handover at a base station request in a broadband wireless access communication system

Publications (2)

Publication Number Publication Date
CA2517736A1 true CA2517736A1 (en) 2004-09-16
CA2517736C CA2517736C (en) 2012-10-02

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CA2517736A Expired - Fee Related CA2517736C (en) 2003-03-08 2004-03-05 System and method for determining a handover at a base station request in a broadband wireless access communication system

Country Status (9)

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US (1) US7336953B2 (en)
EP (1) EP1458209A3 (en)
JP (1) JP4430016B2 (en)
KR (1) KR100640344B1 (en)
CN (1) CN1757183B (en)
AU (1) AU2004217202B2 (en)
CA (1) CA2517736C (en)
RU (1) RU2305902C2 (en)
WO (1) WO2004079949A1 (en)

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