Patent US5891091A successfully refreshed from Google Patents.
EP1530385A2
Expired / Lapsed
EP
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System and method for performing handover in a broadband wireless access communication system
Assignee: Samsung Electronics Co Ltd
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Filing: 2004-11-08
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Granted: —
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Expires: 2024-11-08
Abstract
Abstract Disclosed is a system and a method for controlling a handover of a mobile subscriber station in a broadband wireless access communication system. When serving base station determines to perform a handover of the mobile subscriber station, neighbor base stations to which the mobile subscriber station can be handed over, from among neighbor base stations of the mobile subscriber station, are determined based on a service quality level of service being currently provided to the mobile subscriber station. A handover request signal containing information related to the determined neighbor base station to which the mobile subscriber station can be handed over is transmitted to the mobile subscriber station. The serving base station receives from the mobile subscriber station in response to the request of the handover information about one neighbor base station to which the mobile subscriber station will be handed over, and informs the neighbor base station that the mobile subscriber station will be handed over to the neighbor base station.
Inventors
- 👤 Jung-Je Son
- 👤 Chang-Hoi Koo
- 👤 Yeong-Moon Son
- 👤 Sung-Jin Lee
- 👤 So-Hyun Kim
- 👤 Hyun-Jeong Kang
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 17:28
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/0005; H04W36/0083; H04W36/0085; H04W36/08; H04W36/16; H04W36/22; H04W36/24; H04W36/26; H04W36/30; H04W36/304
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
180 words
A method for controlling a handover of a mobile subscriber station by a
serving base station in a broadband wireless access communication system which
includes the mobile subscriber station, the serving base station for providing
service to the mobile subscriber station, and neighbor base stations neighboring
the serving base station, the method comprising the steps of: determining to perform a handover of the mobile subscriber station; sending to the neighbor base stations information related to types of
service provided from the serving base station to the mobile subscriber station
after determining to perform the handover of the mobile subscriber station; receiving from the neighbor base stations information related to types of
service which can be provided by the neighbor base stations; transmitting to the mobile subscriber station a handover request signal,
which contains the information received from the neighbor base stations; receiving from the mobile subscriber station a handover response signal
indicating one neighbor base station selected by the mobile subscriber station
among the neighbor base stations; and sending a handover notification confirm signal to the selected neighbor
base station.
Claim 2
Dependent Claim
39 words
The method as claimed in claim 1, wherein the step of determining to
perform a handover of the mobile subscriber station is performed when a load for
a current service is equal to or greater than a predetermined load.
Claim 3
Dependent Claim
52 words
The method as claimed in claim 1, wherein the information received
from the neighbor base stations includes information related to a quantity of
service which can be provided by the neighbor base stations at a service quality
level equal to that of the service currently being provided to the mobile subscriber
station.
Claim 4
Independent Claim
128 words
A method for controlling a handover of a mobile subscriber station by
the mobile subscriber station in a broadband wireless access communication
system which includes the mobile subscriber station, a serving base station for
providing service to the mobile subscriber station, and neighbor base stations
neighboring the serving base station, the method comprising the steps of: receiving from the serving base station a handover request signal, which
contains information received from the neighbor base stations; selecting one neighbor base station from among the neighbor base
stations based on the received information and transmitting to the serving base
station a response signal indicating the selected neighbor base station; and transmitting a handover start signal to the serving base station and
performing the handover to the selected neighbor base station.
Claim 5
Dependent Claim
32 words
The method as claimed in claim 4, wherein the information received
from the neighbor base stations includes information related to types of service
which can be provided by the neighbor base stations.
Claim 6
Dependent Claim
57 words
The method as claimed in claim 4, wherein the step of selecting one
neighbor base station is based on channel states of the respective neighbor base
stations and service levels which can be provided by the respective neighbor base
stations, with reference to the information related to the neighbor base stations
received from the serving base station.
Claim 7
Dependent Claim
121 words
The method as claimed in claim 4, wherein the step of selecting one
neighbor base station further comprises the steps of: measuring CINRs (Carrier to Interference and Noise Ratios) of pilot
channel signals received from the neighbor base stations which are determined as
neighbor base stations to which the mobile subscriber station can be handed over; selecting from among the neighbor base stations to which the mobile
I subscriber station can be handed over neighbor base stations from which a CINR
exceeding a predetermined threshold CINR is measured; and selecting one neighbor base station based on information related to
services which can be provided by the selected neighbor base stations and the
CINRs with respect to the selected neighbor base stations.
Claim 8
Dependent Claim
32 words
The method as claimed in claim 4, further comprising a step of
performing by the mobile subscriber station a fast ranging with the selected
neighbor base station through a predetermined frequency band.
Claim 9
Dependent Claim
31 words
The method as claimed in claim 4, further comprising a step of
performing by the mobile subscriber station a fast ranging with the selected
neighbor base station using a ranging code.
Claim 10
Independent Claim
191 words
A method for controlling a handover of a mobile subscriber station by
a serving base station in a broadband wireless access communication system
which includes the mobile subscriber station, the serving base station for
providing service to the mobile subscriber station, and neighbor base stations
neighboring the serving base station, the method comprising the steps of: determining to perform a handover of the mobile subscriber station; sending to the neighbor base stations information related to types of the
service provided from the serving base station to the mobile subscriber station
after determining to perform the handover of the mobile subscriber station; receiving from the neighbor base stations information related to types of
service which can be provided by the neighbor base stations; transmitting to the mobile subscriber station a handover request signal,
which contains the information received from the neighbor base stations; receiving a response signal from the mobile subscriber station in response
to the handover request signal; selecting one neighbor base station based on the information related to
the neighbor base stations contained in the response signal; and sending a handover notification confirm signal to the selected neighbor
base station.
Claim 11
Dependent Claim
38 words
The method as claimed in claim 10, wherein the step of determining
to perform a handover of the mobile subscriber station is performed when a load
for current service is equal to or greater than a predetermined load.
Claim 12
Dependent Claim
52 words
The method as claimed in claim 10, wherein the information received
from the neighbor base stations includes information related to a quantity of
service which can be provided by the neighbor base stations at a service quality
level equal to that of the service being currently provided to the mobile subscriber
station.
Claim 13
Dependent Claim
58 words
The method as claimed in claim 10, wherein the step of selecting one
neighbor base station is performed based on channel states of the respective
neighbor base stations and service levels which can be provided by the respective
neighbor base stations, with reference to the information related to the neighbor
base stations received from the mobile subscriber station.
Claim 14
Dependent Claim
109 words
The method as claimed in claim 10, wherein the step of selecting one
neighbor base station comprises the steps of: detecting CINRs (Carrier to Interference and Noise Ratios) of pilot
channel signals measured by the mobile subscriber station, the pilot channel
signals being transmitted from the respective neighbor base stations; selecting neighbor base stations, to which the mobile subscriber station
can be handed over, from which a CINR exceeding a predetermined threshold
CINR is measured; and selecting one neighbor base station based on the information related to
services which can be provided by the selected neighbor base stations and the
CINRs with respect to the selected neighbor base stations.
Claim 15
Dependent Claim
30 words
The method as claimed in claim 10, further comprising the step of
transmitting to the mobile subscriber station the information included a identifier
of the selected one neighbor base station.
Claim 16
Independent Claim
134 words
A method for controlling a handover of a mobile subscriber station by
the mobile subscriber station in a broadband wireless access communication
system which includes the mobile subscriber station, a serving base station for
providing service to the mobile subscriber station, and neighbor base stations
neighboring the serving base station, the method comprising the steps of: receiving from the serving base station a handover request signal, which
contains information received from the neighbor base stations; transmitting to the serving base station a response signal in response to
the handover request signal; receiving from the serving base station information related to a neighbor
base station to which the mobile subscriber station is handed over; and transmitting to the serving base station a handover start signal and
performing the handover to a selected neighbor base station.
Claim 17
Dependent Claim
74 words
The method as claimed in claim 16, wherein the information received
from the neighbor base stations includes base station identifiers representing the
respective neighbor base stations and information related to a quantity of service
which can be provided by the neighbor base stations, to which the mobile
subscriber station can be handed over, at a service quality level at least equal to
that of the service being currently provided to the mobile subscriber station.
Claim 18
Dependent Claim
32 words
The method as claimed in claim 16, further comprising a step of
performing by the mobile subscriber station a fast ranging with the selected
neighbor base station through a predetermined frequency band.
Claim 19
Dependent Claim
31 words
The method as claimed in claim 16, further comprising a step of
performing by the mobile subscriber station a fast ranging with the selected
neighbor base station using a ranging code.
Claim 20
Dependent Claim
136 words
The method as claimed in claim 16, wherein the step of transmitting
the response signal to the serving base station in response to the handover request
signal further comprises the steps of: measuring CINRs (Carrier to Interference and Noise Ratios) of pilot
channel signals received from the neighbor base stations and detecting channel
states; selecting neighbor base stations from which a CINR exceeding a
predetermined threshold CINR is measured, from among the neighbor base
stations to which the mobile subscriber station can be handed over; and transmitting to the serving base station in response to the handover
request signal a response signal, that includes CINRs with respect to the selected
neighbor base stations to which the mobile subscriber station can be handed over
and information about service to be provided by the selected neighbor base
stations.
Claim 21
Independent Claim
232 words
A system for controlling a handover of a mobile subscriber station by
a serving base station in a broadband wireless access communication system
which includes the mobile subscriber station, the serving base station for
providing service to the mobile subscriber station, and neighbor base stations
neighboring the serving base station, the system comprising: a serving base station for determining to perform a handover of a mobile
subscriber station, sending neighbor base stations information related to service
including types of service provided to the mobile subscriber station, receiving
information related to types of service which can be provided by the neighbor
base stations from the neighbor base stations, transmitting to the mobile
subscriber station a handover request signal which contains the information
received from the neighbor base stations, receiving information about one
neighbor base station selected by the mobile subscriber station from among the
neighbor base stations, and confirming a handover notification to the selected
neighbor base station; and a mobile subscriber station for receiving from the serving base station a
handover request signal containing information received from the neighbor base
stations, selecting one neighbor base station from among the neighbor base
stations based on the received information and transmitting information about the
selected neighbor base station to the serving base station, and transmitting a
handover start signal to the serving base station and performing the handover to
the selected neighbor base station.
Claim 22
Dependent Claim
59 words
The system as claimed in claim 21, wherein the information received
from the neighbor base stations by the serving base station includes information
related to a quantity of service which can be provided by the neighbor base
stations at a service quality level at least equal to that of the service being
currently provided to the mobile subscriber station.
Claim 23
Dependent Claim
42 words
The system as claimed in claim 21, wherein the serving base station
determines to a handover the mobile subscriber station when a load for service
being currently provided by the serving base station is equal to or greater than a
predetermined load.
Claim 24
Dependent Claim
75 words
The system as claimed in claim 21, wherein the mobile subscriber
station measures CINRs (Carrier to Interference and Noise Ratios) of pilot
channel signals received from the neighbor base stations to detect channel states,
and selects one neighbor base station to which the mobile subscriber station is
handed over based on the CINRs measured with respect to the neighbor base
stations to which the mobile subscriber station can be handed over and the service
information.
Claim 25
Dependent Claim
106 words
The system as claimed in claim 21, wherein the mobile subscriber
station measures CINRs (Carrier to Interference and Noise Ratios) of pilot
channel signals received from the respective neighbor base stations to which the
mobile subscriber station can be handed over, selects neighbor base stations from
which a CINR exceeding a predetermined threshold CINR is measured from
among the neighbor base stations to which the mobile subscriber station can be
handed over, and then selects one neighbor base station based on information
related to service which can be provided by the selected neighbor base stations
and the CINRs with respect to the selected neighbor base stations.
Claim 26
Independent Claim
256 words
A system for controlling a handover of a mobile subscriber station by
a serving base station in a broadband wireless access communication system
which includes the mobile subscriber station, the serving base station for
providing service to the mobile subscriber station, and neighbor base stations
neighboring the serving base station, the system comprising: a serving base station for determining to perform a handover of a mobile
subscriber station, sending neighbor base stations information related to types of
service provided to the mobile subscriber station, receiving information related to
types of service which can be provided by the neighbor base stations from the
neighbor base stations, transmitting to the mobile subscriber station a handover
request signal which contains the information received from the neighbor base
stations , receiving a response signal from the mobile subscriber station in
response to the handover request signal, selecting one neighbor base station based
on information related to the neighbor base stations contained in the response
signal, and confirming a handover notification to the selected neighbor base
station; and a mobile subscriber station for receiving from the serving base station a
handover request signal, which contains information received from the neighbor
base stations, transmitting a response signal to the serving base station in response
to the handover request signal, receiving from the serving base station
information related to a neighbor base station to which the mobile subscriber
station is handed over, and transmitting a handover start signal to the serving base
station and performing the handover to a selected neighbor base station.
Claim 27
Dependent Claim
112 words
The system as claimed in claim 26, wherein the mobile subscriber
station detects channel states by measuring CINRs (Carrier to Interference and
Noise Ratios) of pilot channel signals received from the respective neighbor base
stations to which the mobile subscriber station can be handed over, selects
neighbor base stations from which a CINR exceeding a predetermined threshold
CINR is measured from among the neighbor base stations to which the mobile
subscriber station can be handed over, and then transmits to the serving base
station in response to the handover request a response including CINRs with
respect to the selected neighbor base stations to which the mobile subscriber
station can be handed over.
References Cited (Backward Citations)
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