EP0889663A1
Expired / Lapsed
EP
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Call acceptance control method for cdma mobile radio communication system and mobile station device
Assignee: NTT Docomo Inc
•
Filing: 1997-12-25
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Granted: —
•
Expires: 2017-12-25
Abstract
Abstract A call admission control method and a mobile station device for a CDMA mobile communication system which is capable of not damaging a communication quality of a mobile station in communication even under a situation of large traffic, suppressing a possibility for degrading a communication qualities of mobile stations in communication with surrounding base stations sufficiently low, and improving efficiency without increasing the control signal traffic. A radio base station device measures an uplink interference amount and broadcasts it to a mobile station, and the mobile station acquires the uplink interference amount that is broadcast from the base station, calculates a required receiving level at the base station that is expected in a case where it is admitted to a connection target base station according to said acquired uplink interference amount, and judges that admission of the mobile station is refused in a case where it is judged that a prescribed communication quality cannot be satisfied according this calculated required receiving level and the uplink interference amount.
Inventors
- 👤 Yoshihiro Ishikawa
- 👤 Yasuyuki Watanabe
- 👤 Takaaki Sato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 06:37
CPC Classifications
H; H04; H04W; H04W72/00; H04W72/50; H04W72/54; H04W72/541; H04W72/20; H04W72/23; H04W72/542
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
117 words
A call admission control method for a CDMA mobile
communication that controls admission of calls for a
frequency bandwidth shared by a plurality of mobile
stations which carry out communications with radio base
stations by a code division multiple access, the call
admission control method for a CDMA mobile communication
system characterized in that: a radio base station broadcasts a call admission
information indicating a state of own station regarding
admission of a new call using a broadcast channel, and a mobile station acquires said call admission
information which is broadcast from a connection target
radio base station through the broadcast channel, and
judges admission permission/refusal of said mobile station
according to this acquired call admission information.
Claim 2
Dependent Claim
71 words
The call admission control method for a CDMA mobile
communication system as described in claim 1, characterized
in that the mobile station acquires the call admission
information at respective radio base stations which are
broadcast from surrounding radio base stations of the
connection target radio base station through broadcast
channels transmitted by respective radio base stations, and
uses these acquired call admission information in judging
admission permission/refusal of said mobile station.
Claim 3
Dependent Claim
41 words
The call admission control method for a CDMA mobile
communication system as described in claim 1 or 2,
characterized in that the call admission information
indicates either permission or refusal regarding admission
of a new call at own radio base station.
Claim 4
Dependent Claim
53 words
The call admission control method for a CDMA mobile
communication system as described in claim 1 or 2,
characterized in that the radio base station measures an
uplink interference amount at own base station, and the
call admission information is formed at least by said
measured uplink interference amount and a prescribed
threshold.
Claim 5
Dependent Claim
62 words
The call admission control method for a CDMA mobile
communication system as described in claim 1 or 2,
characterized in that the radio base station measures an
uplink interference amount at own base station and
calculates a remaining capacity at own base station
according to this measured uplink interference amount, and
the call admission information indicates at least this
calculated remaining capacity.
Claim 6
Dependent Claim
131 words
The call admission control method for a CDMA mobile
communication system as described in claim 1, characterized
in that the radio base station measures an uplink
interference amount at own base station, and the call
admission information is formed at least by said measured
uplink interference amount at own base station, and the mobile station calculates a required receiving
level at the radio base station that is expected in a case
where it is admitted to the connection target radio base
station, according to the interference amount acquired from
the broadcast channel, and judges that admission of said
mobile station is refused in a case where it is judged that
own station cannot satisfy a required communication
quality, according to said acquired uplink interference
amount and said calculated required receiving level.
Claim 7
Dependent Claim
84 words
The call admission control method for a CDMA mobile
communication system as described in claim 6, characterized
in that the mobile station estimates an uplink interference
amount after said mobile station is admitted, from the
uplink interference amount at the base station and the
required receiving level that is expected in a case where
said mobile station is admitted, and judges that admission
of said mobile station is refused in a case where this
estimated uplink interference amount after admission
exceeds a prescribed threshold.
Claim 8
Dependent Claim
185 words
The call admission control method for a CDMA mobile
communication system as described in claim 6 or 7,
characterized in that the radio base station measures an
uplink interference amount at own base station, and the
call admission information is formed at least by said
measured uplink interference amount at own base station,
and the mobile station calculates an interference amount
to be given to surrounding base stations that is expected
in a case where said mobile station is admitted to the
connection target radio base station, according to a
required receiving level at the connection target radio
base station that is expected in a case where it is
admitted to the connection target radio base station,
estimates an uplink interference amount at surrounding base
stations after said mobile station is admitted to the
connection target radio base station, from said acquired
uplink interference amount at surrounding base stations,
and said calculated interference amount to be given to
surrounding base stations, and judges that admission of
said mobile station is refused when this estimated uplink
interference amount at surrounding base stations exceeds a
prescribed threshold.
Claim 9
Dependent Claim
58 words
The call admission control method for a CDMA mobile
communication system as described in claim 1 or 2,
characterized in that the the radio base station measures a
transmission power of own base station, and the call
admission information is formed at least by said measured
transmission power value of the radio base station and a
prescribed threshold.
Claim 10
Dependent Claim
66 words
The call admission control method for a CDMA mobile
communication system as described in claim 1 or 2,
characterized in that the radio base station measures a
transmission power of own base station and calculates a
remaining capacity at own base station according to said
measured transmission power value of the radio base
station, and the call admission information indicates at
least this calculated remaining capacity.
Claim 11
Dependent Claim
61 words
The call admission control method for a CDMA mobile
communication system as described in claim 1 or 2,
characterized in that the call admission information is
formed at least by a number of spread codes currently used
within own radio base station or a number of hardware
resources currently used within own radio base station, and
a threshold corresponding to them.
Claim 12
Dependent Claim
72 words
The call admission control method for a CDMA mobile
communication system as described in claim 1 or 2,
characterized in that the radio base station calculates a
remaining capacity at own base station according to a
number of spread codes currently used within own radio base
station or a number of hardware resources currently used
within own radio base station, and the call admission
information indicates at least this calculated remaining
capacity.
Claim 13
Dependent Claim
138 words
A mobile station device in a CDMA mobile communication
system for controlling admission of calls for a frequency
bandwidth shared by a plurality of mobile stations which
carry out communications with radio base stations by a code
division multiple access, the mobile station device for a
CDMA mobile communication system characterized by having: acquisition means for acquiring a call admission
information indicating a state regarding admission of a new
call at a radio base station which is broadcast from a
connection target radio base station through a broadcast
channel, judging means for judging admission permission/refusal
of said mobile station according to this acquired call
admission information, and call processing terminating means for terminating a
call processing operation at said mobile station in a case
where it is judged that admission is refused as a result of
this judging.
Claim 14
Dependent Claim
54 words
The mobile station device for a CDMA mobile
communication system as described in claim 13,
characterized in that the acquisition means also acquires
the call admission information at respective radio base
stations which are broadcast from surrounding base stations
of the connection target radio base stations through
broadcast channels transmitted by respective base stations.
Claim 15
Dependent Claim
121 words
The mobile station device for a CDMA mobile
communication system as described in claim 13,
characterized in that the acquisition means acquires an
uplink interference amount from the call admission
information which is broadcast from the connection target
radio base station, and the judging means calculates a required receiving
level at the radio base station that is expected in a case
where it is admitted to the connection target radio base
station, according to the interference amount acquired from
the broadcast channel, and judges that admission of said
mobile station is refused in a case where it is judged that
own station cannot satisfy a required communication
quality, according to said acquired uplink interference
amount and said calculated required receiving level.
Claim 16
Dependent Claim
83 words
The mobile station device for a CDMA mobile
communication system as described in claim 13,
characterized in that the judging unit estimates an uplink
interference amount after said mobile station is admitted,
from the uplink interference amount at the base station and
the required receiving level that is expected in a case
where the mobile station is admitted, and judges that
admission of said mobile station is refused in a case where
this estimated uplink interference amount after admission
exceeds a prescribed threshold.
Claim 17
Dependent Claim
174 words
The mobile station device for a CDMA mobile
communication system as described in claim 13,
characterized in that the acquisition means acquires an
uplink interference amount at the base station from the
call admission information that is broadcast through the
broadcast channel, and the judging unit calculates an interference amount to
be given to surrounding base stations that is expected in a
case where said mobile station is admitted to the
connection target radio base station, according to a
required receiving level at the connection target radio
base station that is expected in a case where it is
admitted to the connection target radio base station,
estimates an uplink interference amount at surrounding base
stations after said mobile station is admitted to the
connection target radio base station, from said acquired
uplink interference amount at surrounding base stations,
and said calculated interference amount to be given to
surrounding base stations, and judges that admission of
said mobile station is refused when this estimated uplink
interference amount at surrounding base stations exceeds a
prescribed threshold.
References Cited (Backward Citations)
No citation records indexed.
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