EP0847147A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Transmission power control method for a CDMA communication system
Assignee: Hitachi Ltd
•
Filing: 1997-12-04
•
Granted: —
•
Expires: 2017-12-04
Abstract
Abstract An uplink channel transmission power control method is provided for a CDMA mobile communication system performing one way communication. A base station (203) measures the received level of data transmitted from each mobile terminal (204) at each channel, and generates a transmission power control signal of each uplink traffic channel. The generated transmission power control signals are multiplexed, and the multiplexed common transmission power control signal is transmitted to all mobile terminals by using the common channel shared by the mobile terminals. Each mobile terminal derives the transmission power control signal of the uplink traffic channel used by the terminal, from the received common transmission power control signal, and controls the transmission power of a data packet.
Inventors
- 👤 Katsuhiko Tsunehara
- 👤 Takashi Yano
- 👤 Nobukazu Doi
- 👤 Takaki Uta
- 👤 Keiji Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 04:08
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/54; H04W52/06; H04W52/14; H04W52/146; H04W52/18; H04W52/24; H04W52/245; H04W52/58; H04W88/00; H04W88/08
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
133 words
A transmission power control method for a
spectrum spreading communication system which performs
communication between a base station (203) and a
plurality of mobile terminals (204) by spectrum
spreading, wherein: said base station measures the reception level
of a signal transmitted from each of said plurality of
mobile terminals, generates a transmission control signal
in accordance with the reception level, and transmits a
common transmission power control signal containing
transmission power control signals of said plurality of
mobile terminals; and each of said plurality of mobile terminals
receives said common transmission power control signal,
derives the transmission power control signal destined
thereto from said common transmission power control
signal, and controls the transmission power of a signal
to be transmitted to said base station in accordance with
said derived transmission power control signal.
Claim 2
Dependent Claim
39 words
A transmission power control method according
to claim 1, wherein said transmission power control
signal is a signal indicating an increase/decrease of
said transmission power and obtained through comparison
between said reception level and a predetermined
reference reception level.
Claim 3
Dependent Claim
184 words
A transmission power control method for a
spectrum spreading communication system which performs
communication between a base station (203) and a
plurality of mobile terminals (204) by using a plurality
of channels, wherein: said plurality of channels includes first
channels allocated to said mobile terminals for
transmitting a data packet to said base station and a
second channel used by said base station to transmit a
control signal to said plurality of mobile terminals,
said second channel being shared by said plurality of
mobile terminals; said base station measures the reception level
of a signal received at each of said first channels,
generates a transmission control signal in accordance
with the reception level, and transmits a transmission
power control signal of each of said first channels to
said second channel, as part of said control signal; and each of said plurality of mobile terminals
receives said transmission power control signal destined
thereto at said second channel, and controls the transmission
power of a signal to be transmitted via a corresponding
one of said first channels in accordance with
said received transmission power control signal.
Claim 4
Dependent Claim
70 words
A transmission power control method according
to claim 3, wherein each of said first channels is
allocated to each of said plurality of mobile terminals,
said base station comprises third channels for transmitting
data packets to said plurality of mobile terminals,
and either a pair of said first channel and said third
channel or only said first channel is allocated by said
base station to said plurality of mobile terminals.
Claim 5
Dependent Claim
162 words
A transmission power control method for a
spectrum spreading communication system which performs
communication between a base station (203) and a
plurality of mobile terminals (204) by spectrum
spreading, wherein: said base station measures the reception level
of a signal transmitted from each of said plurality of
mobile terminals, generates a transmission control signal
in accordance with the reception level, transmits a
common transmission power control signal containing
transmission power control signals of mobile terminals
performing one way communication, and transmits a
transmission signal containing a transmission power
control signal of a mobile station performing two way
communication thereto; and each of said plurality of mobile terminals
receives said common transmission power control signal or
said transmission signal, derives a transmission power
control signal destined thereto from said common transmission
power control signal or from said transmission
signal, and controls the transmission power of a signal
to be transmitted to said base station in accordance with
said derived transmission power control signal.
Claim 6
Dependent Claim
163 words
A transmission power control method for a
spectrum spreading communication system which performs
communication between a base station (203) and a
plurality of mobile terminals (204), wherein: each of said plurality of mobile stations
receives a control signal transmitted from said base
station, and transmits a reservation packet representative
of a transmission request for a data packet, at a
transmission power corresponding to the reception level
of said control signal; said base station receives said reservation
packet, generates an initial transmission power control
signal in accordance with the reception level of said
reservation packet, and transmits said initial transmission
power control signal to a corresponding one of said
plurality of mobile terminals, said initial transmission
power control signal being contained in an answer packet
indicating a traffic channel via which said corresponding
one transmits said data packet; and said corresponding one starts transmitting said
data packet at a transmission power corresponding to said
initial transmission power control signal contained in
said answer packet.
Claim 7
Dependent Claim
123 words
A transmission power control method according
to claim 6, wherein: said base station measures the reception level
of said data packet transmitted from each of said
plurality of mobile terminals, generates a transmission
power control signal in accordance with said reception
level of the data packet, and transmits a common transmission
power control signal containing the transmission
power control signals of a plurality of traffic channels;
and each of said plurality of mobile terminals
receives said common transmission power control signal,
derives the transmission power control signal of the
transmission packet via which said data packet was
transmitted, from said common transmission power control
signal, and controls the transmission power of another
data packet in accordance with said derived transmission
power control signal.
Claim 8
Dependent Claim
52 words
A transmission power control method according
to claim 7, wherein when each of said plurality of mobile
terminals receives said common transmission power control
signal, said mobile terminal neglects said common transmission
power control signal if a lapse time from when
said data packet starts being transmitted exceeds a
predetermined limit time.
Claim 9
Dependent Claim
29 words
A transmission power control method according
to claim 7, wherein a transmission power of said control
signal is known in advance at each of said plurality of
mobile terminals.
Claim 10
Dependent Claim
129 words
A spectrum spreading communication system for
performing communication between a base station (203) and
a plurality of mobile terminals (204) via a plurality of
channels, wherein: said plurality of channels include uplink
traffic channels for transmitting a data packet from each
mobile terminal to said base station, a reservation
channel for transmitting a reservation packet representative
of a traffic channel allocation request from each
mobile terminal to said base station, and an answer
channel for transmitting an answer packet indicating an
uplink traffic channel via which a data packet is transmitted
from said base station to each mobile terminal;
and a common transmission power control signal is
transmitted via said answer channel, said common transmission
power control signal containing a transmission
power control signal of said uplink traffic channel.
Claim 11
Dependent Claim
77 words
A spectrum spreading communication system
according to claim 10, wherein: said answer packet contains an ID of a
corresponding mobile terminal which transmitted said
reservation packet, information of said uplink traffic
channel allocated by said base station, and initial
transmission power control information indicating a
transmission power when said data packet starts being
transmitted; and said initial transmission power control
information is generated in accordance with a reception
power of said reservation packet at said base station.
Claim 12
Dependent Claim
26 words
A spectrum spreading communication system
according to claim 10, wherein said common transmission
power control signal is inserted in said answer channel
at a predetermined interval.
Claim 13
Dependent Claim
105 words
A base station (203) for communicating with a
plurality of mobile terminals (204) by spectrum
spreading, comprising: a reception circuit for receiving a data packet
transmitted from each of said plurality of mobile
terminal; a unit for measuring the reception level of
said received data packet; a generator for generating a transmission power
control signal in accordance with said measured reception
level of said data packet; and a transmission circuit for transmitting a common
transmission power control signal to said plurality
of mobile terminals, said common transmission power
control signal containing said generated transmission
power control signal of each of said plurality of mobile
terminals.
Claim 14
Dependent Claim
37 words
A base station according to claim 13 wherein
said reception circuit includes an acquisition/despread
circuit for demodulating a spectrum spread signal, and
said transmission circuit includes a spreader for
spectrum spreading said common transmission power control
signal.
Claim 15
Dependent Claim
89 words
A base station (203) for communicating with a
plurality of mobile terminals (204) by spectrum
spreading, comprising: a reception circuit for receiving a data packet
transmitted from each of said plurality of mobile
terminal; a unit for measuring the reception level of
said received data packet; a generator for generating a transmission power
control signal in accordance with said measured reception
level of said data packet; and a transmission circuit for transmitting said
generated transmission power control signal to said
plurality of mobile terminals, as part of control
information.
Claim 16
Dependent Claim
138 words
A base station (203) for communicating with a
plurality of mobile terminals (204) by spectrum
spreading, comprising: a first reception circuit for receiving a
reservation packet representative of a transmission
request for a data packet to be transmitted from each of
said plurality of mobile terminals; second reception circuits for receiving data
packets transmitted from said plurality of mobile
terminals; a unit for measuring the reception level of
said received data packet; a traffic channel transmission power control
signal generator for generating a transmission power
control signal in accordance with said measured reception
level of said data packet; and a transmission circuit for transmitting a
common transmission power control signal to said
plurality of mobile terminals, said common transmission
power control signal containing said generated transmission
power control signals to be transmitted to said
plurality of mobile terminals.
Claim 17
Dependent Claim
46 words
A base station according to claim 16, wherein
said transmission circuit transmits an answer packet
indicating a traffic channel via which each mobile
terminal transmits said data packet, said answer packet
being generated after the interpretation of said reservation
packet received by said first reception circuit.
Claim 18
Dependent Claim
62 words
A base station according to claim 17, further
comprising: a unit for measuring the reception level of
said received reservation packet; and a reservation channel transmission power
control signal generator for generating an initial transmission
power control signal in accordance with said
measured reception level of said reservation packet, wherein said initial transmission power control
signal is contained in said answer packet.
Claim 19
Dependent Claim
94 words
A mobile terminal (204) for communicating with
a base station (203) by spectrum spreading, comprising: a reception circuit for receiving a common
transmission power control signal transmitted from said
base station, said common transmission power control
signal containing transmission power control signals of a
plurality of mobile terminals; a calculator for calculating a gain in
accordance with a transmission power control signal
destined to the mobile terminal and derived from said
common transmission power control signal; and a transmission circuit for transmitting a data
packet at a transmission power corresponding to said
calculated gain.
Claim 20
Dependent Claim
131 words
A mobile terminal (204) for communicating with
a base station (203) by spectrum spreading, comprising: a first reception circuit for receiving a
common transmission power control signal transmitted from
said base station, said common transmission power control
signal containing transmission power control signals of a
plurality of mobile terminals, and for receiving an
answer packet transmitted from said base station, said
answer packet indicating a traffic channel via which the
mobile terminal transmits a data packet; a calculator for calculating a gain in accordance
with a transmission power control signal destined to
the mobile terminal and derived from said common transmission
power control signal; and a transmission circuit for transmitting said
data packet at a transmission power corresponding to said
calculated gain via said traffic channel designated by
said answer packet.
Claim 21
Dependent Claim
66 words
A mobile terminal according to claim 20,
wherein said answer packet includes an initial transmission
power control signal, said calculator calculates a
gain to be used at the start of transmission in accordance
with said initial transmission power control signal,
and said transmission circuit starts transmitting said
data packet at a transmission power corresponding to said
calculated gain to be used at the start of transmission.
Claim 22
Dependent Claim
110 words
A mobile terminal according to claim 20,
further comprising: a second reception circuit for receiving a
control signal transmitted from said base station, a
transmission power of said control signal being known in
advance by the mobile terminal; a unit for measuring the reception level of
said control signa; and a reservation channel gain calculator for
calculating a reservation packet gain in accordance with
the reception level of said measured control signal, said
reservation packet gain being used for transmitting a
reservation packet representative of a transmission
request for said data packet, wherein said transmission circuit transmits
said reservation packet at a transmission power corresponding
to said reservation packet gain.
Claim 23
Dependent Claim
174 words
A mobile terminal (204) for communicating with
a base station (203) by spectrum spreading, comprising: a first reception circuit for receiving a
common transmission power control signal transmitted from
said base station, said common transmission power control
signal containing transmission power control signals of a
plurality of mobile terminals, and for receiving an
answer packet transmitted from said base station, said
answer packet indicating a traffic channel via which the
mobile terminal transmits a data packet; a second reception circuit for receiving said
data packet containing said transmission power control
signal transmitted from said base station; a switch for switching a connection to a gain
calculator between said first reception circuit and said
second reception circuit; and a transmission circuit for transmitting said
data packet at a transmission power corresponding to the
gain calculated by said gain calculator via the traffic
channel designated by said answer packet, wherein said gain calculator calculates the
gain in accordance with said common transmission power
control signal or said transmission power control signal
derived from said data packet.
Claim 24
Dependent Claim
45 words
A mobile terminal according to claim 23,
wherein said switch connects said first reception circuit
to said gain calculator while the mobile terminal performs
one way communication, and connects said second
reception circuit to said gain calculator while the
mobile terminal performs two way communication.
Claim 25
Dependent Claim
67 words
A mobile terminal according to claim 23,
wherein said answer packet includes an initial transmission
power control signal, said gain calculator
calculated a gain to be used for the start of transmission
in accordance with said initial transmission power
control signal, and said transmission circuit starts
transmitting said data packet at a transmission power
corresponding to said calculated gain to be used for the
start of transmission.
Claim 26
Dependent Claim
110 words
A mobile terminal according to claim 23,
further comprising: a second reception circuit for receiving a
control signal transmitted from said base station, a
transmission power of said control signal being known in
advance by the mobile terminal; a unit for measuring the reception level of
said control signa; and a reservation channel gain calculator for
calculating a reservation packet gain in accordance with
the reception level of said measured control signal, said
reservation packet gain being used for transmitting a
reservation packet representative of a transmission
request for said data packet, wherein said transmission circuit transmits
said reservation packet at a transmission power corresponding
to said reservation packet gain.
References Cited (Backward Citations)
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