SPECIFICATION
RADIO BASE STATION, RELAY STATION, RADIO COMMUNICATION
SYSTEM AND RADIO COMMUNICATION METHOD
Technical Field
[0001]
The present invention relates to a radio base station,
a relay station, a radio communication system and a radio
communication method which utilize radio communication,
and particularly relates to a technique suitable for use
with, for example, a system prescribed by the IEEE 802 .16.
Background Art
[0002]
At present, a radio communication system wherein
communication is carried out through a radio communication
path as represented by a system of WCDMA, CDMA2000 or the
like is used popularly in the world. In such a radio
communication system as just described, a radio base
station (BS; Base Station) is provided in a service area
such that a radio terminal carries out communication with
a different communication apparatus (communication
terminal) through the radio base station.
FIG. 18 shows a connection scheme of the P-MP (Point
to Multipoint) type wherein a radio base station 101
connects to a plurality of radio terminals (MS; Mobile
Stations) 102 in a cover area (cell) 100 thereof. In the
IEEE (The Institute of Electrical and Electronics

Engineers, Inc.) 802.16 which is the standards of
high-speed radio data communication, such a P-MP scheme
as shown in FIG. 18 is prescribed as a form of communication.
Further, in the IEEE 802.16 WG, principally two kinds of
specifications including the 802.16d specifications
(802.16-2004) for point-to-point communication
applications and the 802.16e specifications
(802.16e-2005) for mobile communication applications are
prescribed.
[0003]
In such a P-MP type connection scheme as shown in
FIG. 18, since the service area is limited to the inside
of the cell 100 of the radio base station 101 and the radio
environment is not good on the boundary (cell edge) of
the cell 100, high-speed communication is in most cases
difficult.
In order to solve this problem, the IEEE 802.16 WG
establishes a task group 802.16j for developing a
specification of a relay system where a relay station (RS;
Relay Station) carries out relay between a radio base
station and a radio terminal, and the working of the task
group is proceeding at present.
[0004]
It is to be noted that matters relating to the IEEE
802.16 described above are disclosed, for example, in
Non-Patent Documents 1 to 3 listed hereinbelow.
Further, a technique is disclosed in Patent Document

1 listed hereinbelow wherein, in a relay system through
a relay station, a radio base station decides scheduling
in communication between a relay station and a radio
terminal, and the relay station receives scheduling
information between the relay station and the radio
terminal from the radio base station and executes
communication control between the relay station and the
radio terminal based on the scheduling information. At
this time, since the scheduling process is executed in
a concentrated manner by the radio base station, it is
sufficient for the relay station to have an easy
implementation.
[0005]
In the technique disclosed in Patent Document 1,
where the overall scheduling in communication between the
relay station and the radio terminal is carried out by
the radio base station, it becomes necessary for the relay
station to relay a signal and data received from the radio
terminal to the radio station without changing the contents
of the signal and the data. This is because the information
of the radio terminal received by the relay station is
required by the radio base station in order that the radio
base station carries out, in place of the relay station,
scheduling between the relay station and the radio
terminal.
Non-Patent Document 1: IEEE Std802.16-2004
Non-Patent Document 2: IEEE Std802.16e-2005

Non-Patent Document 3: 2006 Comprehensive Meeting
of The Japan Society of Information and Communication
Research B-5-140 "Effects of the multiple MAP (map) in
the IEEE 802.16 relay system"
Patent Document 1: Japanese Patent Laid-Open No.
2006-74325
Disclosure of the Invention
Subject to Be Solved by the Invention
[0006]
According to the background art described above,
a radio terminal can carry out radio communication with
a radio base station directly or through a relay station.
However, since information of the radio terminal
received by the relay station is required by the radio
base station in order for the radio base station to carry
out scheduling between the relay station and the radio
terminal in place of the relay station, consumption of
a band which is a radio communication resource increases.
[0007]
Therefore, it is one of objects of the present
invention to achieve effective utilization of a radio
communication resource.
It is to be noted that, in addition to the object
described above, also it shall be understood as another
one of objects of the present invention to achieve such
effects as are provided by the constitutions indicated
by the best mode for carrying out the present invention

hereinafter described but are not achieved by the
conventional techniques.
Means for Solving the Subject
[0008]
(1) In order to attain the object described above,
according to an aspect of the present invention, there
is provided a relay station which relays a signal to be
transferred between a radio base station and a radio
terminal, the relay station including a storage section
adapted to store communication controlling information
for communication control with the radio terminal, a base
station side signal reception section adapted to receive,
from the radio base station, scheduling information in
communication between the relay station and the radio
terminal, a complementation section adapted to complement
contents of the scheduling information received by the
base station side signal reception section in accordance
with the communication controlling information stored in
the storage section, and a terminal side signal
transmission section adapted to transmit the scheduling
information whose contents are complemented by the
complementation section to the radio terminal.
[0009]
(2) Preferably, the relay station further includes
a terminal side signal reception section adapted to receive
a signal and a message from the radio terminal and store
information of the received signal and message into the

storage section, an intensive collection section adapted
to intensively collect the information of the signal and
message from the radio terminal, and a base station side
signal transmission section adapted to transmit the
information intensively collected by the intensive
collection section to the radio base station in order to
produce the scheduling information.
[0010]
(3) In this instance, preferably the terminal side
signal reception section receives signals and messages
from a plurality of radio terminals and stores information
of the received signals and messages as the communication
controlling information into the storage section; the
intensive collection section intensively collects the
information of the signals and messages from the plural
radio terminals into one piece of information; and the
complementation section complements the contents of the
scheduling information received by the base station side
signal reception section in an associated relationship
with communication controlling information of each of the
plural radio terminals in accordance with the
communication controlling information stored in the
storage section.
[0011]
(4) Or, the relay station may be configured such
that the terminal side signal reception section receives
band request signals from the radio terminals and stores,

as the communication controlling information, kind
information of the band request signals and position
information of the band request signals in a terminal
transmission region as information of the received band
request signals into the storage section, the intensive
collection section intensively collects the information
of the band request signals from the radio terminals, and
the complementation section complements, regarding the
scheduling information received by the reception section,
the kind information of the band request signals and the
position information of the band request signals in the
terminal transmission region stored in the storage
section.
[0012]
(5) Or else, the relay station may be configured
such that the terminal side signal reception section
receives power/timing adjustment signals from the radio
terminals and produces power/timing adjustment
information for the corresponding radio terminals from
the received power/timing adjustment signals and then
stores kind information of the power/timing adjustment
signals and position information in a terminal
transmission region as the communication controlling
information into the storage section together with the
produced power/timing adjustment information, the
intensive collection section collects information of the
power/timing adjustment signals from a plurality of the

radio terminals, the complementation section complements,
regarding the scheduling information andmessages received
by the reception section, the kind information of the
power/timing adjustment signals and the position
information of the power/timing adjustment signals in the
terminal transmission region stored in the storage section,
and the terminal side signal transmission section
transmits the power/timing adjustment information
corresponding to the power/timing adjustment signals
stored in the storage section to the radio terminals
together with the scheduling information whose contents
are complemented by the complementation section.
[0013]
(6) Further, according to another aspect of the
present invention, there is provided a relay station which
relays a signal to be transferred between a radio base
station and a radio terminal, the relay station including
a terminal side reception section adapted to receive
information of a signal and a message transmitted from
the radio terminal, a decision section adapted to decide
based on the information received by the terminal side
reception section whether or not a notification of the
information relating to the signal and the message received
from the radio terminal is to be issued to the radio base
station, and a notification section adapted to issue the
notification of the relating information to the radio base
station when it is decided by the decision section that

the notification of the information relating to the signal
and message received from the radio terminal is tobe issued
to the radio base station.
[0014]
(7) Preferably, the relay station of (6) described
above may be configured such that the terminal side
reception section receives information of a signal and
a message relating to a radio channel state between the
relay station and the radio terminal transmitted from the
radio terminal; the decision section decides, based on
the information relating to the radio channel state between
the relay station and the radio terminal received by the
reception section, that a notification of the relating
information is to be issued to the radio base station when
a radio communication met hod used between the relay station
and the radio terminal need to be changed; and the
notification section issues, when it is decided by the
decision section that the radio communication method need
to be changed, a notification of at least one of the radio
channel information and the radio communication method
between the relay station and the radio terminal as a
notification of the relating information to the radio base
station.
[0015]
(8) According to a further aspect of the present
invention, there is provided a radio base station for
transmitting and receiving a signal to and from a radio

terminal through the relay station in (2) , the radio base
station comprising a reception section adapted to receive
information from the base station side signal transmission
section of the relay station, a scheduling information
production section adapted to produce the scheduling
information except for information to be complemented by
the complementation section of the relay station based
on the information received by the reception section, and
a transmission section adapted to transmit the scheduling
information produced by the scheduling information
production section to the relay station.
[0016]
( 9) According toa still further aspect of the present
invention, there is provided a radio base station for
transmitting and receiving a signal to and from radio
terminals through the relay station in (4) , the radio base
station comprising a reception section adapted to receive
information from the base station side signal transmission
section of the relay station, a scheduling information
production section adapted to carry out band allocation
by the number equal to the number of band request signals
intensively collected in the information received by the
reception section and produce the scheduling information
based on the information received by the reception section,
and a transmission section adapted to transmit the
scheduling information produced by the scheduling
information production section to the relay station.

(10) According to a yet further aspect of the present
invention, there is provided a radio base station for
transmitting and receiving a signal to and from a radio
terminal through the relay station in (5) , the radio base
station including a reception section adapted to receive
information from the base station side signal transmission
section of the relay station, a scheduling information
production section adapted to produce the scheduling
information for which band allocation by the number equal
to the number of power/timing adjustment signals
intensively collected in the received information is
carried out based on the information received by the
reception section, and a transmission section adapted to
transmit the scheduling information produced by the
scheduling information production section to the relay
station.
[0018]
(11) According to a yet aspect of the present of the
present invention, there is provided a radio communication
system comprising radio terminals, a radio base station
for transmitting and receiving signals to and from the
radio terminals, and a relay station for relaying a signal
to be transferred between the radio terminals and the radio
base station, the relay station including a terminal side
signal reception section adapted to receive signals and
messages from the radio terminal, a storage section adapted

to store information of the signals and messages received
by the terminal side reception section as communication
controlling information for communication control between
the radio terminals and the relay station, an intensive
collection section adapted to intensively collect the
information of the signals and the messages from the radio
terminals, and a base station side transmission section
adapted to transmit the information intensively collected
by the intensive collection section to the radio base
station, the radio base station comprising a reception
section adapted to receive information from the base
station side signal transmission section, a scheduling
information production section adapted to produce
scheduling information in communication between the relay
station and the radio terminals except for information
to be complemented by the complementation section of the
relay station based on the information received by the
reception section of the relay station, and a transmission
section adapted to transmit the scheduling information
produced by the scheduling information production section
to the relay station, the relay station further including
a base station side signal reception section adapted to
receive the scheduling information from the radio base
station, a complementation section adapted to complement
contents of the scheduling information received by the
base station side signal reception section in accordance
with the communication controlling information stored in

the storage section, and a terminal side signal
transmission section adapted to transmit the scheduling
information whose contents are complemented by the
complementation section to the radio terminals.
[0019]
(12) According to a yet further aspect of the present
invention, there is provided a radio communication system
comprising a radio terminal, a radio base station for
transmitting and receiving a signal to and from the radio
terminal, and a relay station for relaying a signal
transferred between the radio terminal and the radio base
station, the relay station including a radio channel state
reception section adapted to receive information of a
signal and a message relating to a radio channel state
between the relay station and the radio terminal from the
radio terminal, a decision section adapted to decide based
on the information received by the channel state reception
section whether or not a radio communication method used
between the relay station and the radio terminal needs
to be changed, and a notification section adapted to issue,
when it is decided by the decision section that the radio
communication method needs to be changed, a notification
of at least one of radio channel information and the radio
communication method between the relay station and the
radio terminal as relating information to the radio base
station, the radio base station comprising a scheduling
information production section adapted to change a radio

communication method to be used between the radio base
station and the radio terminal through the relay station
and produce scheduling information in communication
wherein the radio communication method is changed based
on the relating information issued from the notification
section, and a transmission section adapted to transmit
the scheduling information produced by the scheduling
information production section to the relay station.
[0020]
(13) It is to be noted that, in the radio communication
system of (12) described above, the radio communication
method which is a target of the change may include a
modulation method, a coding method and a coding ratio as
elements thereof.
(14) Further, according to a yet aspect of the present
of the present invention, there is provided a radio
communication method by a plurality of radio terminals,
a radio base station for transmitting and receiving signals
to and from the radio terminals and a relay station for
relaying a signal to be transferred between the radio
terminals and the radio base station, the method including,
in the relay station, receiving signals and messages from
the radio terminals, storing information of the received
signals and messages as communication controlling
information for communication control between the radio
terminals and the relay station, intensively collecting
the information of the signals and messages from the radio

terminals, and transmitting the intensively collected
information to the radio base station, in the radio base
station, receiving the intensively collected information
from the relay station, producing scheduling information
for communication between the relay station and the
individual radio terminals based on the received
intensively collected information, and transmitting the
scheduling information to the relay station, and, in the
relay station, receiving the scheduling information
transmitted from the radio base station, complementing
contents of the received scheduling information in
accordance with the stored communication controlling
information, and transmitting the scheduling information
whose contents are complemented to the radio terminals.
[0021]
(15) According to a yet aspect of the present
invention, there is provided a relay station interposed
between a radio base station and radio terminals for
carrying out a relay process, the relay station including
a storage section adapted to store information obtained
by reception of signals from the radio terminals, a
notification section adapted to issue to the radio base
station a notification of securing of a transmission region
in an upward direction based on the received signal, a
reception section adapted to receive transmission region
information in the upward direction in the relay station
secured by the radio base station in accordance with the

notification, and a transmission section adapted to add
contents to the transmission region information based on
the information stored in the storage section and transmit
the transmission region information to which the contents
are added in a downward direction.
Effect of the Invention
[0022]
In this manner, with the present invention, since
scheduling information of the radio terminal can be
complemented by the relay station, there is an advantage
that effective utilization of radio communication resource
can be achieved.
Brief Description of the Drawings
[0023]
[FIG. 1] FIG. 1 is a view illustrating an example
of a configuration of a radio communication system to which
embodiments of the present invention are applied.
[FIG. 2] FIG. 2 is a view illustrating an example
of a radio frame format to which the embodiments are applied.
[FIG. 3] FIG. 3 is a view illustrating a signal
sequence in a first embodiment of the present invention.
[FIG. 4] FIG. 4 is a view illustrating a signal
sequence as a comparative example to the signal sequence
of the first embodiment.
[FIG. 5] FIG. 5 is a block diagram showing a relay
station in the first embodiment.
[FIG. 6] FIG. 6 is a view illustrating information

to be stored by a storage section of the relay station
in the first embodiment.
[FIG. 7] FIG. 7 is a view illustrating an example
of a configuration of a controlling message to be produced
by a notification section of the relay station in the first
embodiment.
[FIG. 8] FIG. 8 is a block diagram illustrating a
radio base station in the first embodiment.
[FIG. 9] FIG. 9 is a view illustrating a signal
sequence in a second embodiment of the present invention.
[FIG. 10] FIG. 10 is a block diagram illustrating
a relay station in the second embodiment.
[FIG. 11] FIG. 11 is a view illustrating information
to be stored in a storage section of the relay station
in the second embodiment.
[FIG. 12] FIG. 12 is a view illustrating an example
of a configuration of a controlling message to be produced
by a notification section of the relay station in the second
embodiment.
[FIG. 13] FIG. 13 is a block diagram illustrating
a radio base station in the second embodiment.
[FIG, 14] FIG. 14 is a view illustrating a signal
sequence in the third embodiment of the present invention,
[FIG. 15] FIG. 15 is a block diagram illustrating
a relay station of a third embodiment.
[FIG. 16] FIG. 16 is a view illustrating information
to be stored in a storage section of the relay station

in the third embodiment.
[FIG. 17] FIG. 17 is a view illustrating an example
of a configuration of a controlling message to be produced
by a notification section of the relay station in the third
embodiment.
[FIG. 18] FIG. 18 is a view illustrating a radio
communication system.
Description of Reference Characters
[0024]
1 radio communication system
2, 2', 2A to 2C radio base station
2a cover area
3, 3', 3A to 3C relay station
4-1, 4-2, 4-21 to 4-23 radio terminal
100 cover area
101 radio base station
102 radio terminal

201, 211 reception section
202, 212 controlling message extraction section
203, 213 scheduling section
204, 214 NW interface section
205, 215 buffer section
206, 216 transmission section

301, 311, 321 reception section
302, 312, 322 Code reception section
303, 313, 323 storage section
304, 314 intensive collection section

305, 315, 325 notification section
306, 316, 326 transmission section
307 UL MAP (map) extraction section
308, 318 relay section
317 DL MAP (map) extraction section
324 decision section
Best Mode for Carrying Out the Invention
[0025]
In the following, embodiments of the present
invention are described with reference to the drawings.
[a] Description of an Example of the Configuration
of the Radio Communication System to Which the Embodiments
Are Applied
FIG. 1 is a view illustrating an example of a
configuration of a radio communication system to which
the embodiments are applied. A radio communication system
1 illustrated in FIG. 1 includes a radio base station (BS)
2, a relay station (relay station; RS) 3, and a plurality
of (here, two) radio terminals (MS#1, MS#2) 4-1 and 4-2.
It is to be noted that, where the radio terminals 4-1 and
4-2 are not distinguished from each other in the following
description, the radio terminal is referred to simply as
radio terminal 4.
[0026]
Then, the radio terminal 4-1 existing in a cover
area 2a of the radio base station 2 can carry out transfer
(communication) of a radio signal with the radio base

station 2 (BS-MS link) , and the radio terminal 4-2 outside
the cover area 2a of the radio base station 2 can carry-
out radio communication with the radio base station 2
through the relay station 3 (BS-RS link and RS-MS link).
It is to be noted that, as the radio terminal 4, not only
an MS suitable for movement but also a radio apparatus
suitable for utilization in a stationary state can be used.
[0027]
A radio frame format for radio communication among
the radio base station 2, relay station 3 and radio terminals
4-1 and 4-2 described above is illustrated as an example
of a radio frame format to which the present embodiment
is applied in FIG. 2. It is to be noted that, while a radio
frame format ready for the IEEE Std 802.16d,e is taken as
an example here, the present invention is not limited to
this.
[0028]
In FIG. 2, reference characters Tx and Rx signify
transmission and reception, respectively. Accordingly,
the BS 2 transmits a DL/UL MAP (map), MMR bursts #1 and
#2 and a downward burst T4-1 in order while using a preamble
(P) as the top of the frame. It is to be noted that the
MMR burst #1 is transmission data from the radio base station
2 to a relay station not shown in FIG. 1; the MMR burst
#2 is transmission data to the relay station 3 shown in
FIG. 1; and the downward burst 4-1 is transmission data
to the radio terminal 41 in FIG. 1.

[0029]
The preamble (P) is a synchronizing signal to be
transmitted to the inside of the area of the radio base
station 2 to make it possible for the relay station 3 to
be synchronized with the radio base station 2 and is
transmitted as a predetermined known pattern in a fixed
period. It is to be noted that, in FIG. 2, if an Up Link
Sub-frame (up link sub-frame) ends, then transmission of
a Down Link Sub-frame (down link sub-frame) is started
again in order from the preamble.
[0030]
The radio terminal 4 can store plural kinds of
patterns of the preamble in advance such that a pattern
whose reception quality (for example, reception level)
is highest from among the patterns is selected as that
of the radio base station 2 which is a communication
destination.
Where, for example, OFDMA (Orthogonal Frequency
Division Multiplexing Access) is utilized as a radio method,
while the radio base station 2 allocates the transmission
data to different sub carriers and the plural sub carriers
are used to carry out transmission, also the preamble can
be allocated to the sub carriers with a predetermined
pattern and transmitted. The radio terminal 4 can receive
a combination of predetermined sub carriers to carry out
matching with the known preamble signal so as to establish
synchronism with the radio base station 2 which transmits

the best preamble.
[0031]
The DL/UL MAP (map) is transmitted subsequently to
the transmission of the preamble of the Down Link Sub-frame
(down link sub frame) and is controlling data for
controlling transmission and reception operation of
transmission and reception timings, transmission and
reception channels, a radio communication method
(modulationmethod, coding method, coding rate or the like)
and is so forth with regard to the relay station 3 and
the radio terminal 4-1. The MAP (map) data includes DL
MAP (map) data and UL MAP (map) data, and the DL MAP (map)
data defines a structure of a downward sub frame and the
UL MAP (map) data defines a structure of an upward sub
frame.
[0032]
The DL MAP (map) data includes data for the
notification of a transmission timing and a transmission
channel (a reception timing and a reception channel to
the reception side), a radio communication method and so
forth regarding a region of the MMR #2 which is the
transmission data to the relay station 3 (including MAP
(map) data, transmission data and so forth destined for
the radio terminal 4-2) and data for the notification of
a transmission timing and a transmission channel (a
reception timing and a reception channel to the reception
side) , a radio communication method and so forth regarding

the region of the T4-1 which is the transmission data for
the radio terminal 4-1. It is to be noted that also the
controlling data in a region of the MMR #1 in FIG. 2 which
is the transmission data to the relay station not shown
in FIG. 1 is included in the DL MAP (map).
[0033]
On the other hand, the UL MAP (map) data includes
MAP (map) data for the notification of a region (a reception
timing and a reception channel (a transmission timing and
a transmission channel to the transmission side)) for
receiving an RNG (Ranging (ranging) signal) and a CQI
(Channel Quality Indicator) from the radio terminal 4,
a radio communication method and so forth, and MAP (map)
data for the notification of a region (a reception timing
and a reception channel (a transmission timing and a
transmission channel to the transmission side)) for
receiving the MMR #2 (MMR #1 from a relay station not shown)
from the relay station 3, a radio communication method
and so forth.
[0034]
Here, the Ranging (ranging) signal is a known signal
and is received by the radio station 2 (or by the radio
base station 2 through the relay station 3). The radio
station 2 which receives the ranging signal reports a result
obtainedby determining not only a difference of a reception
timing (phase shift) and a difference of a reception
frequency but also information of increase or decrease

of required transmission power as Adjustment (adjustment)
information to the radio base station 2. In this example,
the RNG from the radio terminal 4-1 is directly received
within an RNG reception period of the radio base station
2 and the RNG from the radio terminal 4-2 is received within
an RNG reception period of the relay station 3, and the
RNGs are transmitted to the radio base station 2 through
the MMR #2 of an upward link.
[0035]
The CQI indicates a transmission period for reporting
a result obtained by carrying out measurement of the
reception quality such as a CINR (Career to Interference
and Noise Ratio) or the like for a known signal such as
a preamble, a pilot signal (known signal included in
downward burst data or the like) or the like by the radio
terminal 4 . The radio base station 2 changes transmission
parameters such as a modulation method, a coding method,
a coding rate and so forth, for example, based on the CQI
information received from the radio terminal 4-1 under
the radio base station 2 itself.
[0036]
In particular, control in a direction in which the
transmission speed is raised is carried out where the
reception quality is good, but control in another direction
in which the transmission speed is lowered is carried out
where the reception quality is degraded.
Incidentally, the relay station 3 transmits the

preamble and the DL/UL MAP (map) in order to provide a
service to the radio terminal 4-2 outside the area where
the radio base station 2 forms such as a radio terminal
4-2 shown in FIG. 1. In particular, since the radio
terminal 4-2 cannot receive the preamble and so forth
transmitted from the radio base station 2, by receiving
the preamble and so forth transmitted from the relay station
3, the radio terminal 4-2 can be synchronized with a radio
frame transmitted from the relay station 3. It is to be
noted that, as the preamble transmitted from the relay
station 3, not only a preamble same as that transmitted
from the radio base station 2 but also another preamble
different from that transmitted from the radio base station
2 may be used.
[0037]
The DL/UL MAP (map) transmitted from the relay
station 3 defines a region (transmission and reception
timings and channels) and a radio communication method
for carrying out radio communication with the radio
terminal 4-2 under the relay station 3 and originates from
the data transmitted with the MMR #2 of the downward link,
and the DL/UL MAP (map) can be set so as to have contents
different from those of the DL/UL MAP (map) transmitted
from the radio base station 2.
Accordingly, since the radio terminal 4-2 receives
the preamble (P) transmitted from the relay station 3 to
establish synchronization and the DL MAP (map) to detect

the transmission region and the radio communication method
of the downward burst T4-2, the radio terminal 4-2 receives
the burst T4-2 with the region and the radio communication
method. Similarly, the radio terminal 4-2 acquires the
transmission region and the radio communication method
of the RNG, CQI and T4-2 included in the received UL MAP
(map).
[0038]
Then, the relay station 3 receives the RNG, CQI and
T4-2 in accordance with the notified UL MAP (map) and
transmits the received data to the radio base station 2
through the MMR #2 of the upward link.
In this manner, while the radio communication of
the radio terminal 4-2 can be supported by installing the
relay station 3, the radio base station 2 receives, in
order to produce not only the DL/UL MAP (map) for the
communication with the radio terminal 4-1 and the relay
station 3 but also the DL/UL MAP (map) for the radio terminal
4-2, the information of the radio terminal 4-2 received
by the relay station 3.
[0039]
In the present embodiment, the information amount
to be transmitted by the MMRs #2 of the upward/downward
links between the relay station 3 and the radio base station
2 can be suppressed.
[b] Description of the First Embodiment
Outline of a Signal Sequence in the First E]mbodiment

FIG. 3 is a view illustrating a signal sequence
regarding a BW Request Code (request code) and a response
signal to the request code signaled from the radio base
station 2 according to the first embodiment of the p)resent
invention, and FIG. 4 is a view illustrating a signal
sequence as a comparative example to the signal sequence
of the first embodiment. It is to be noted that, in FIGS. 3
and 4, it is assumed that the relay stations 3 and 3' are
individually connected to three radio terminals 4-21 to
4-23.
[0040]
It is to be noted that the BW Request Code (request
code) is a code to be transmitted, when data should be
transmitted from the radio terminal 4 to the network, at
first from the radio terminal 4 to the radio base station
2 (through the relay station 3' in FIG. 4 or the relay
station 3 in FIG. 3), for example, in the RNG region of
the upward link in FIG. 2. The radio terminal selects one
of plural kinds of codes and transmits the selected code.
Then, a CDMA Allocation (allocation) IE which is a response
to the BW Request Code (request code) is information defined
in the UL MAP (map) and is used for the notification of
a frame region (transmission and reception timings) and
a communication method for signaling the BW Request from
the radio terminal 4, to the radio terminal 4 which
transmitted the BW Request Code (request code) . The radio
terminal 4 which receives the CDMA Allocation (allocation)

IE can transmit the BW Request which is a band request
for transmitting data to the network with the frame region
(transmission timing) and the communication method
designated by the CDMA Allocation (allocation) IE, to the
radio base station 2.
[0041]
Here, in order for the radio base station 2 to carry
out band allocation corresponding to the BW Request Code
(request code) through the UL MAP (map) as in the relay
station 3' shown in FIG- 4, it is supposed that, when BW
Request Codes (request codes) #1 to #3 are received from
the plural radio terminal 4-21 to 4-23, it becomes necessary
upon every reception to relay information (for example,
the kind of the code) of the BW Request Codes (request
codes) to the radio base station 2 together with information
of the reception timings (frame number, frame position).
[0042]
In particular, the radio base station 2' shown in
FIG. 4 receives the information relating to the BW Request
Code (request code) every time, and produce scheduling
information (DL/UL MAP (map)) including responses (CDMA
Allocation (allocation) lEs (Information Elements) ; which
are described each as CDMA Alloc IE in FIG. 4) to the BW
Request Codes (request codes).
[0043]
On the other hand, with the relay station 3 according
to the first embodiment shown in FIG. 3, in order to produce

scheduling information in the radio base station 2 where
the BW Request Codes (request codes) #1 to #3 are received
from the radio terminals 4-21 to 4-23, respectively,
information intensively collected rather than all
information in the case of FIG. 4 is transmitted as a single
BW Request Message (request message) to the radio base
station 2 without transmitting all information of the BW
Request Codes (request codes) #1 to #3 including the
information of the reception timings (that is, information
of the transmission timings from the radio terminal).
[0044]
In particular, when the BW Request Codes (request
codes) #1 to #3 are received from the plural connected
radio terminals 4-21 to 4-23, respectively, the relay
station 3 stores the BW Request Codes (request codes) #1
to #3 and information of the reception position of the
BW Request Codes (request codes) in radio frames
(information obtained by reception of signals from the
radio terminals). Then, the relay station 3 transmits,
as information obtained by intensively collecting the
information of the BW Request Codes (request cod.es) , for
example, not patterns of the received BW Request Codes
(request codes) themselves but information of the number
of the received BW Request Codes (request codes) as the
BW Request Message (request message) to the radio base
station 2. It is to be noted that transmission of the
information of the reception timings of the BW Request

Codes (request codes) #1 to #3 stored by the relay station
3 itself to the radio base station 2 is omitted.
[0045]
The radio base station 2 secures the number of regions
for CDMA Allocation (allocation) lEs equal to the number
of the BW Request Codes (request codes) received from the
relay station 3 and produces the UL MAP (map) . In
particular, the radio base station 2 does not carry out
the particular information of the reception frame position
of the BW Request Code (request code) individually in the
CDMA Allocation (allocation) IEx3 which are responses to
the radio terminals 4-21 to 4-23 which transmitted the
BW Request Codes (request codes) #1 to #3, respectively,
but outputs a response Rl (CDMA Allocation (allocation)
IE in the UL MAP (map) ) representing that regions for the
allocation are secured. Normally, while the value of the
BW Request Codes (request codes) and the position of radio
frames when the radio terminals 4-21 to 4-23 transmit the
BW Request Codes (request codes) #1 to #3, respectively,
are described in the CDMA Allocation (allocation) IE, since
the radio base station 2 in the first embodiment does not
grasp the information just described, the description of
the information into the region is omitted.
[0046]
In particular, the positions, which are to be written
into the CDMA Allocation (allocation) lEs, of the radio
frames when the radio terminals 4-21 to 4-23 transmit the

BW Request Codes (request codes) #1 to #3, respectively,
are stored in the relay station 3 as described above.
Therefore, the relay station 3 writes the contents of the
information stored therein into the CDMA Allocation
(allocation) IE region in the UL MAPs (maps) from the radio
base station 2 and allocates the frame positions of the
BW Requests individually. It is to be noted that the
priority degree of the allocation can be determined using
the arrival order, the degree of importance or the like
of the Codes as a scale.
[0047]
The relay station 3 transmits the CDMA Allocation
(allocation) lEs #1 to #3 as responses in which the frame
positions of the BW Requests are allocated in this manner
in the UL MAP (map) (refer to R2). The radio terminals
4-21 to 4-23 can read out the contents of the response
CDMA Allocation (allocation) lEs #1 to #3 corresponding
to the BW Request Codes (request codes) #1 to #3 transmitted
from the radio terminals 4-21 to 4-23 themselves from the
contents of the received UL MAPs (maps), respectively,
so that each of them can obtain the frame position and
the radio communication method designated for transmitting
a later BW Request.
[0048]
Consequently, the transmission amount of the
information relating to the BW Request Code (request code)
particularly from the relay station 3 to the radio base

station 2 can be reduced and the MMR #2 which is a radio
communication resource of the upward link can be
effectively used.
Configuration of the Relay Station in the First
Embodiment
Taking notice of such a function for achieving
enhancement of efficiency of a radio communication
resource as described above, the relay station 3 in the
first embodiment includes a reception section 301, a Code
reception section 302, a storage section 303, an intensive
collection section 304, a notification section 305, a
transmission section 306, a UL MAP (map) extraction section
307 and a relay section 308 similarly to a relay station
3A shown in FIG. 5.
[0049]
Here, the reception section 301 receives a signal
or a radio signal which forms a message from the radio
terminal 4-2 (refer to FIG. 1, radio terminals 4-21 to
4-23 in FIG. 3) and the radio base station 2. Further,
the Code reception section 302 extracts a code (Code) like,
for example, such a BW Request Code (request code) (band
request signal) from the radio terminal 4-2 as described
above from the signal or the message received by the
reception section 301. In particular, information of a
symbol (symbol) and a sub channel (subchannel) is detected
as information of a frame number, a code value and a position
of a radio frame when the code is received.

[0050]
Accordingly, a terminal side signal reception
section for receiving signals and messages from the plural
radio terminals 4-21 to 4-23 and storing information of
the received signals and messages into the storage section
303 is configured from the reception section 301 and the
Code reception section 302 described above. Further, a
base station side signal reception section for receiving
scheduling information in communication between the radio
base station 2A and the plural radio terminals 4 through
the relay station 3A from the radio base station 2A is
configured from the reception section 301 described above .
[0051]
The storage section 303 stores the information of
the signals and the messages from the plural radio terminals
4-21 to 4-23. In particular, as the information of the
band request signal received by the Code reception section
302, information of the kind and the position of the band
request signals is stored as communication controlling
information by the storage section 302. For example, as
shown in FIG. 6, the information of the code number and
frame number extracted and detected by the Code reception
section 302 and the symbol and the sub channel which are
information of the position of the radio frame when the
code is received is stored. Further, the storage section
303 stores the communication controlling information for
controlling communication with the plural radio terminals

4-21 to 4-23 (in this instance, information for producing
a DL/UL MAP (map) which is scheduling information).
[0052]
The intensive collection section 304 intensively
collects the information of the signals and the messages
from the plural radio terminals 4-21 to 4-23. In
particular, where such a BW Request Code (request code)
from the radio terminal 4-2 as described above is received
by the Code reception section 302, the number of such BW
Request Codes (request codes) received in the frame is
counted and information of the counted number of the BW
Request Codes (request codes ) is passed to the notification
section 305 so as to be signaled as a controlling message
to the radio base station 2A.
[0053]
Consequently, the notification section 305 produces
a controlling message based on the information of the number
of the BW Request Codes (request codes) from the intensive
collection section 304, and the transmission section 306
radio transmits the controlling message produced by the
notification section 305 to the radio base station 2A.
It is to be noted that a band for transmission of the
controlling message is allocated by the radio base station
2A when the relay station 3A receives the BW Request Code
(request code) from the radio terminal 4-2.
[0054]
An example of a configuration of the controlling

message to be produced by the notification section 305
is illustrated in FIG. 7. As illustrated in FIG. 7, ID
information (RS ID) of the relay station 3A which is
identification information of the transmission source,
information of a kind (type) of the controlling message
(Message Type), a frame number (Frame Number) when the
relay station 3A receives the BW Request Code (request
code) and a count value (No. BW Request Code) of the number
of the BW Request Codes (request codes) at that time can
be included in the controlling message.
[0055]
Accordingly, a base station side signal transmission
section for transmitting information intensively
collected by the intensive collection section 304 to the
radio base station 2A in order to produce a DL/UL MAP (map)
which is scheduling information is composed from the
notification section 305 and the transmission section 306
described above.
Further, the UL MAP (map) extraction section 307
extracts the UL MAP (map) from the signal received from
the radio base station 2A by the reception section 301.
[0056]
The CDMA Allocation (allocation) IE which is a
response to the BW Request Code (request code) is included
in the UL MAP (map). When the relay section 308 relays
the UL MAP (map) extracted by the UL MAP (map) extraction
section 307 to the radio terminal 4-2 through the

transmission section 306, particularly the information
of the CDMA Allocation (allocation) IE is converted into
the information stored in the storage section 303
[0057]
As described above, while the information of the
position, frame number, code value and so forth of the
radio frame when the radio terminals 4-21 to 4-23 transmit
the BW Request Codes (request codes) #1 to #3 are stored
into the storage section 303 of the relay station 3A, by
the intensive collection process by the intensive
collection section 304, the information stored in the
storage section 303 is omitted from the contents (contents
of the controlling message of FIG. 7) to be signaled to
the radio base station 2A. Accordingly, the information
just described is not included in the CDMA Allocation
(allocation) IE included in the UL MAP (map) from the radio
base station 2A.
[0058]
The relay section 308 can write to complement the
contents (information of the position, frame number, code
value and so forth of the radio frame) stored in the storage
section 303 into the region of the CDMA Allocation
(allocation) IE in the UL MAP (map) extracted by the UL
MAP (map) extraction section 307, and can individually
allocate a frame position of a BW Request to be transmitted
from the radio terminal 4-2. The CDMA Allocation
(allocation) IE whose contents are complemented in this

manner can be transmitted to the radio terminal 4 through
the transmission section 306. It is to be noted that the
priority degree of the allocation can be determined using
the arrival order of the Codes, the degree of importance
or the like as a scale.
[0059]
Accordingly, a complementation section for
complementing the contents of the scheduling information
(from the radio base station 2A) received by the reception
section 301 in accordance with the communication
controlling information stored in the storage section 303
is configured by the relay section 308 described above.
Inparticular, the relay section 308 as the complementation
section complements the kind of the band request signal
and the position information stored in the storage section
303 regarding the scheduling information received by the
reception section 301.
[0060]
Further, the transmission section 306 configures
a terminal side signal transmission section for
transmitting the scheduling information whose contents
are complemented by the relay section 308 to the plural
radio terminals 4-21 to 4-23.
Configuration of the Radio Base Station 2A in the
First Embodiment
Further, taking notice of the function for achieving
enhancement of the efficiency of such a communication

resource as described above, the radio base station 2A
in the first embodiment includes a reception section 201,
a controlling message extraction section 202, a scheduling
section 203, an NW interface section 204, a buffer section
205 and a transmission section 206 as shown in FIG. 8.
[0061]
Here, the reception section 201 receives a radio
signal which configures a signal or a message from the
relay station 3Aor the radio terminal 4-1 (refertoFIG. 1) .
Further, the controlling message extraction section 202
extracts information of the controlling message from the
signal or the message received by the reception section
201. For example, the controlling message extraction
section 202 extracts contents of the controlling message
for the notification of the number of such BW Request Codes
(request codes) received by the relay station 3A as
illustrated in FIG. 7.
[0062]
The scheduling section 203 produces a DL/UL MAP (map)
which is the scheduling information from the contents
described in the controlling message extracted by the
controlling message extraction section 202. For example,
where such a controlling message for the notification of
the number of the BW Request Codes (request codes) as
illustrated in FIG. 7 is extracted by the controlling
message extraction section 202, the scheduling section
203 produces CDMA Allocation (allocation) lEs for the

number of regions equal to the number of the BW Request
Codes (request codes) and adds the produced CDMA Allocation
(allocation) lEs to the UL MAP (map) . At this time, the
produced CDMA Allocation (allocation) IE does not include
particular information which configures a response to the
BW Request Codes (request codes) .
[0063]
Accordingly, the scheduling section 203 described
above functions as a scheduling information production
section for producing a DL/UL MAP (map) which is the
scheduling information based on the information received
by the reception section 201 except for informa~ion to
be complementedby the relay section 308 of the relay station
3A described above. In other words, the scheduling section
203 carries out, based on the information received by the
reception section 201, allocation of the number of bands
equal to the number of band request signals intensively
collected in the information received by the reception
section 201 to produce scheduling information.
[0064]
The NW interface section 204 carries out an interface
process for signaling the data from the radio terminal
4 received by the reception section 201, for example, to
a different network, and carries out another interface
process for a signal destined for the radio terminal 4
from the different network. Further, the buffer section
205 carries out buffering to transmit the data from the

NW interface section 204 or the DL/UL MAP (map) produced
by the scheduling section 2 03 from the transmission section
206 at a predetermined timing.
[0065]
The transmission section 206 transmits the signal
or the message from the buffer section 205 to the relay
station 3A or the radio terminal 4-1. For example, the
transmission section 206 transmits the scheduling
information produced by the scheduling section 203 to the
relay station 3A.
•Working Effect
Since the relay station 3A and the radio base station
2A in the first embodiment are configured in such a manner
as described above, for example, as illustrated in the
signal sequence of FIG. 3, the relay station 3A can transmit
the information of the BW Request Codes (request codes)
#1 to #3 from the radio terminals 4-2 as an intensively
collected controlling message to the radio base station
2A and transmit a CDMA Allocation (allocation) IE from
the radio base station 2A to the radio terminals 4-2 while
complementing the contents of the CDMA Allocation
(allocation) IE.
[0066]
In particular, the reception section 301 and the
Code reception section 302 of the relay station 3A receive
BW Request Codes (request codes) as signals or messages
from the plural radio terminals 4-21 to 4-23 and store

the information of the code number, frame position and
frame number which are information of the received BW
Request Codes (request codes) as communication controlling
information for communication control between the; relay
station 3A and the radio terminals 4-21 to 4-23 into the
storage section 303. Further, the intensive collection
section 304 intensively collects the information of the
BW Request Codes (request codes) from the radio terminals
4-21 to 4-23, and the notification section 305 and the
transmission section 306 transmit the intensively
collected information to the radio base station 2A (refer
to "BW Request Message (request message)" in FIG. 3 and
refer to FIG. 7).
[0067]
Further, in the radio base station 2A, the reception
section 201 andthe controlling message extraction section
202 receive the intensively collected information
described above from the relay station 3A, and the
scheduling section 203 produces scheduling information
(CDMA Allocation (allocation) IE of the UL MAP (map)) for
communication between the radio base station 2A and the
individual radio terminals 4-21 to 4-23 through zhe relay
station 3A based on the received intensively collected
information. Further, the buffer section 205 and the
transmission section 206 transmit the scheduling
information produced as just described to the relay station
3A (refer to reference character R1 in FIG. 3) . At this

time, particular information which forms a response to
the BW Request Code (request code) is not included in the
CDMA Allocation (allocation) IE which forms the produced
scheduling information (in other words, the portion is
left as a blank space).
[0068]
The scheduling information transmitted from the
radio base station 2A is received by the reception section
301 and the UL MAP (map) extraction section 307 of the
relay station 3A, and the contents of the received
scheduling information are complemented by the relay
section 308 in accordance with the communication
controlling information stored in the storage section 303
(in other words, particular information which configures
a response to the BW Request Codes (request codes) is
incorporated). Then, the scheduling information whose
contents are complemented is transmitted to the radio
terminals 4-21 to 4-23 by the transmission section 306
(refer to reference character R2 of FIG. 3)
[0069]
It is to be noted that each of the radio terminals
4-21 to 4-23 extracts the CDMA Allocation (allocation)
IE which is a response to the BW Request Code (request
code) transmitted from the radio terminal itself from the
frame position information and the CDMA code information
in the CDMA Allocation (allocation) IE in the received
UL MAP (map). Consequently, the radio terminals 4-21 to

4-23 can thereafter transmit a BW Request in a region
designated in the Up Link Sub-frame in the UL MAP (map) .
[0070]
In this manner, with the first embodiment of the
present invention, since the information of the UL MAP
(map) corresponding to each of the radio terminals 4-21
to 4-23 can be complemented by the relay station 3A, there
is an advantage that effective utilization of the radio
communication resource can be achieved.
It is to be noted that, while the case wherein the
plural radio terminals 4-21 to 4-23 are accommodated in
the relay station 3A is described in the first embodiment
described above, the present invention is not limited to
this, and, also in a case wherein one radio terminal is
accommodated, effective utilization of the radio
communication resource can be achieved similarly as in
the first embodiment.
[0071]
[b] Description of the Second Embodiment of the
Present Invention
While, in the first embodiment, the case is described
wherein, where the relay station 3B is installed, the BW
Request Code (request code) is transmitted as a band request
signal from a radio terminal 4-2 and the CDMA Allocation
(allocation) IE in the UL MAP (map) is transmitted as a
response from the radio base station 2B, in the second
embodiment, a case is described wherein a Ranging Code

(ranging code) is transmitted from a radio terminal 4-2
and an RNG-RSP in the DL MAP (map) is transmitted as a
response from the radio base station 2B.
[0072]
It is to be noted that the Ranging Code (ranging
code) is a code which is transmitted from the radio terminal
4-1 to the radio base station 2B shown in FIG. 1 to allow
the radio terminal 4-1 to receive an instruction (RNG-RSP)
for controlling the transmission power, transmission
timing and transmission frequency in the radio terminal
4-1 from the radio base station 2B.
Where the relay station 3B is installed as in the
present embodiment, a radio terminal 4-2 which exists
within the cover area of the relay station 3B but outside
the cover area of the radio base station 2B transmits the
Ranging Code (ranging code) at a stage at which radio
connection to the relay station 3B starts, and receives
transmission power control and so forth through a response
(RNG-RSP) from the relay station 3B. At this time, it is
necessary to receive allocation of a band through a DL
MAP (map) from the radio base station 2B in order that
the relay station 3B transmits the RNG-RSP to the radio
terminal 4-2. Accordingly, it is necessary for the relay
station 3B to transmit information regarding the Ranging
Code (ranging code) from the radio terminal 4-2 to the
radio base station 2B.
[0073]

Here, where the relay station 3B is installed, it
is estimated that, if the relay station 3B receives the
Ranging Codes (ranging codes) #1 to #3 from the plural
radio terminals 4-21 to 4-23, then, in order for the radio
base station 2B to carry out band allocation corresponding
to the Ranging Codes (ranging codes) through the DL MAP
(map), it becomes necessary every time of reception each
Ranging Code (ranging code) to relay the information of
the Ranging Code (ranging code) to the radio base station
2B together with the information of the reception timing
(frame number, frame position).
[0074]
On the other hand, in the second embodiment, it is
anticipated that the information regarding the Ranging
Code (ranging code) tobe transmitted from the relay station
3B to the radio base station 2B is intensively collected
and the relay station 3B produces an RNG-RSP to effectively
utilize a band as hereinafter described.
Outline of a Signal Sequence in the Second
Embodiment
FIG. 9 is a view illustrating a signal sequence
regarding Ranging Codes (ranging codes) signaled from the
radio terminals 4-21 to 4-23 and response signals to the
Ranging Codes (ranging codes). When the Ranging Codes
(ranging codes) #1 to #3 are received from the radio
terminals 4-21 to 4-23, respectively, not all information
of the Ranging Codes (ranging codes) #1 to #3 including

information regarding the reception timing (in other words,
information regarding the transmission timing from each
radio terminal 4) is transmitted in order to allow the
radio base station 2B to produce a DL MAP (map) described
above, but intensively collected information rather than
all information regarding the Ranging Code (ranging code)
is transmitted as a single RS Ranging Message (ranging
message) to the radio base station 2B similarly as in the
case of FIG. 3 of the first embodiment.
[0075]
In particular, where the Ranging Codes (ranging
codes) #1 to #3 are received from the plural radio terminals
4-21 to 4-23 connected to the relay station 3B, respectively,
the relay station 3B stores adjustment information such
as the power, timing, frequency and so forth (controlling
information for adjusting the transmission power, timing
and frequency from the radio terminals 4-21 to 4-23) to
the radio terminal 4-21 to 4-23 together with the Ranging
Codes (ranging codes) #1 to #3 and information of the
reception positions of the Ranging Codes (ranging codes) .
[0076]
Then, the relay station 3B transmits, for example,
following the case of the first embodiment, not patterns
of the received Ranging Codes (ranging codes) "themselves
but information of the number of the received Ranging Codes
(ranging codes ) as the RS Ranging Message (ranging message)
to the radio base station 2B. It is to be noted that

transmission of the information, for adjusting the
reception timings, power and so forth of the Ranging Codes
(ranging codes) #1 to #3 stored in the relay station 3B
itself as described above, to the radio base station 2B
is omitted.
[0077]
The radio base station 2B secures the number of
regions for the RNG-RSP equal to the number of the Ranging
Codes (ranging codes) received from the relay station 3B
within a data region in the frame to produce a DL MAP (map) .
In particular, the radio base station 2B designates regions
for the RNG-RSPs in the DL MAP (map) as responses R3 to
the radio terminals 4-21 to 4-23 from which the Ranging
Codes (ranging codes) #1 to #3 have been transmitted,
respectively. It is to be noted that, since the radio base
station 2B has not received the controlling information
such as the transmission power, transmission timing and
so forth from the relay station 3B, individual writing
of the controlling information is not carried out for the
designated regions RNG-RSP.
[0078]
In particular, the transmission power controlling
information and the phase controlling information or the
frequency controlling information, which are to be written
into the RNG-RSPs, for the radio terminals 4-21 to 4-23
are stored in the relay station 3B as described above.
Therefore, the relay station 3B writes the contents of

the information into the RNG-RSP regions designated by
the DL MAP (map) and issues notifications of the
transmission power controlling information,. the
controlling information of the transmission timing (phase)
so forth as the RNG-RSPs #1 to #3 to the radio terminals
4-21 to 4-23, respectively.
[0079]
Consequently, the transmission amount of the
information regarding the Ranging Code (ranging code)
particularly from the relay station 3B to the radio base
station 2B can be reduced and the MMR #2 which is a radio
communication resource of the upward link can be used
efficiently.
Configuration of the Relay Station in the Second
Embodiment
Taking notice of such a function for achieving
enhancement of the efficiency of a radio communication
resource as described above, the relay station 3B in the
second embodiment includes a reception section 311, a Code
reception section 312, a storage section 313, an intensive
collection section 314, a notification 315, a transmission
section 316, a DL MAP (map) extraction section 317 and
a relay section 318 similarly to the relay station 3B shown
in FIG. 10.
[0080]
Here, the reception section 311 receives a radio
signal which configures a signal or a message from the

radio terminal 4-2 (refer to FIG. 1, any of the radio
terminals 4-21 to 4-23 in FIG. 9) and the radio base station
2B. Meanwhile, the Code reception section 312 extracts,
for example, a code (Code) such as a Ranging Code (ranging
code) from the radio terminal 4-2 described above from
the signal or the message received by the reception section
311.
[0081]
In particular, the Code reception section 312 detects
a frame number and a code value when a code is received,
and detects information of a symbol (symbol) and a sub
channel (subchannel) as position information of the radio
frame when the code is received. Particularly, where the
reception section 311 receives the Ranging Codes (ranging
codes) from the radio terminals 4-21 to 4-23, the Code
reception section 312 measures the reception power and
the reception timings from the reception signals of the
Ranging Codes (ranging codes) and stores power and timing
adjustment information to the radio terminals 4-2 produced
basedonaresultof the measurement into the storage section
313.
[0082]
Accordingly, a terminal side signal reception
section for receiving signals and messages from the plural
radio terminals 4-21 to 4-23 and storing the information
of the received signals and messages into the storage
section 313 is configured from the reception section 311

and the Code reception section 312 described above.
Particularly, the Code reception section 312 receives the
Ranging Codes (ranging codes) which are power/timing
adjustment signals from the plural radio terminals 4-21
to 4-23 and produces power/timing adjustment information
for the corresponding radio terminals 4-21 to 4-23 from
the received Ranging Codes (ranging codes) and then stores
the kind (code kind) information and the position
information as the Ranging Codes (ranging codes) as
communication controlling information into the storage
section 313 together with the produced power/timing
adjustment information.
[0083]
Further, a base station side signal reception section
for receiving scheduling information (DL/UL MAP (map))
in the communication between the radio base station 2B
and the individual plural radio terminals 4-21 to 4-23
through the relay station 3B from the radio base station
2B is configured from the reception section 311 described
above.
Furthermore, the storage section 313 stores
communication controlling information (in this instance,
information for producing the DL/UL MAP (map) which is
scheduling information) for controlling communication
with the plural radio terminals 4-21 to 4-23. In
particular, as illustrated in FIG. 11, a code number (Code)

and a frame number (Frame Number) extracted and detected
by the Code reception section 312 and information of a
symbol (Symbol) and a sub channel (Subchannel) which are
information of the position of the radio frame when the
code is received are stored as information relating to
the Ranging Code (ranging code) received by the Code
reception section 312, and timing adjustment information
(Timing) and power adjustment information (Power) are
stored as power/timing adjustment information.
[0084]
The intensive collection section 314 intensively
collects the power/timing adjustment signals from the
plural radio terminals 4-21 to 4-23 to be transmitted to
the radio base station 2B. In particular, where the Code
reception section 312 receives the Ranging Codes (ranging
codes) which are such power/timing adjustment signals from
the radio terminals 4-21 to 4-23 as described above, the
number of the Ranging Codes (ranging codes ) received within
the frame is counted and the information of the counted
number of the Ranging Codes (ranging codes) is passed to
the notification section 315 so as to be transmitted as
a controlling message to the radio base station 2.
[0085]
Consequently, the notification section 315 produces
a controlling message based on the information of the number
of the Ranging Codes (ranging codes) from the intensive
collection section 314, and the transmission section 316

transmits the controlling message produced by the
notification section 315 to the radio base station 2. It
is to be noted that a band for transmission of the
controlling message is allocated by the radio base station
2B when the relay station 3B receives the Ranging Code
(ranging code) from the radio terminal 4-2.
[0086]
An example of the configuration of the controlling
message to be produced by the notification section 315
is illustrated in FIG. 12- As illustrated in FIG. 10 {sic),
ID information of the relay station 3B which is
identification information of the transmission source (RS
ID), information of the kind (type) of the controlling
message (Message Type), the frame number when the relay
station 3B receives the Ranging Code (ranging code) (Frame
Number) and the count value of the number of the Ranging
Codes (ranging codes) at the time (No. Ranging Code) can
be included in the controlling message.
[0087]
Accordingly, a base station side signal transmission
section for transmitting information intensively
collected by the intensive collection section 314 to the
radio base station 2 in order to produce a DL/UL MAP (map)
which is scheduling information is configured from the
notification section 315 and the transmission section 316
described above.
Further, the DL MAP (map) extraction section 317

extracts the DL MAP (map) from the signal from the radio
base station 2 received by the reception section 311.
[0088]
The power and timing adjustment information for the
Ranging Code (ranging code) is written into the RNG-RSP
whose region is designated by the DL MAP (map) . Then, while
the relay station 318 relays the DL MAP (map) extracted
by the DL MAP (map) extraction section 317, regarding the
information (symbol and sub channel) of the position of
the radio frame originating particularly from the radio
terminal which has transmitted the code, the DL MAP (map)
is complemented with the contents stored in the storage
section 313. Further, the relay section 318 writes the
power/timing adjustment information to the radio terminals
4-21 to 4-23 into the RNG-RSP designated by the DL MAP
(map). The signal into which the contents of the DL MAP
(map) and the RNG-RSP are written in this manner is
transmitted to the radio terminals 4-21 to 4-23 through
the transmission section 316.
[0089]
As described above, the position information, frame
number, code value and so forth of a radio frame when the
radio terminals 4-21 to 4-23 transmit the Ranging Codes
(ranging codes) are stored into the storage section 313
of the relay station 3B, but are omitted from the contents
to be transmitted to the radio base station 2B (contents
of the controlling message in FIG. 12).

The relay station 318 writes the contents
(information of the position, frame number, code value
and so forth of the radio frame) stored in the storage
section 313 to complement the contents of the DL MAP (map)
extracted by the DL MAP (map) extraction section 317, and
writes the power/timing adjustment information to the
radio terminals 4-21 to 4-23 into the RNG-RSP region
designated by the DL MAP (map) described above.
[0090]
Accordingly, a complementation section for
complementing the contents of scheduling information ( from
the radio base station 2B) receivedby the reception section
311 in accordance with communication controlling
information stored in the storage section 313 is configured
by the relay section 318 described above. In other words,
the relay section 318 as the complementation section
complements the RNG-RSP designated by the DL MAP (map)
received by the reception section 311 using kind
information and position information of the power/timing
adjustment signal stored in the storage section 313.
[0091]
Further, the transmission section 316 as the terminal
side signal transmission section, transmits the DL MAP (map)
which is scheduling information whose contents are
complemented by the relay section 318 and transmits the
power/timing adjustment information produced by the Code
reception section 312 to the plural radio terminals 4-21

to 4-23 through the RNG-RSP.
Consequently, the radio terminals 4-21 to 4-23 can
extract the power/timing adjustment information
corresponding to the Ranging Codes (ranging codes)
transmitted individually from the radio terminals from
the RNG-RSP referring to the DL MAP (map) and transmit
a signal with the transmission power and at the timing
based on the extracted adjustment information.
Configuration of the Radio Base Station 2B in the
Second Embodiment
Further, taking notice of such a function for
achieving enhancement of efficiency of a radio
communication resource as described above, the radio base
station 2B in the second embodiment includes a reception
section 211, a controlling message extraction section 212,
a scheduling section 213, an NW interface section 214,
a buffer section 215 and a transmission section 216 as
shown in FIG. 13.
[0092]
Here, the reception section 211 receives a radio
signal which configures a signal or a message from the
relay station 3B or the radio terminal 4-1 (refer to FIG. 1)
and receives information from the transmission section
316 which configures the base station side signal
transmission section in the relay station 3B. Further,
the controlling message extraction section 212 extracts
information of the controlling message from within the

signal or the message received by the reception section
211. For example, the controlling message extraction
section 212 extracts the contents of the controlling
message for the notification of such number of the Ranging
Codes (ranging codes) as shown in FIG. 12 from the relay
station 3B.
[0093]
The scheduling section 213 produces a DL/UL MAP (map)
which is scheduling information from the contents
described in the controlling message extracted by the
controlling message extraction section 212. For example,
when the controlling message extraction section 212
extracts such a controlling message for the notification
of the number of Ranging Codes (ranging codes) as shown
in FIG. 12, the scheduling section 213 secures the number
of RNG-RSPs equaltothe number of the Ranging Codes (ranging
codes) based on the DL MAP (map) . At this time, the
information of the position, the frame number, the code
value and so forth of the radio frame are not described
in the DLMAP (map), and particular power/timing adjustment
information which makes a response to the Ranging Codes
(ranging codes) is not included in the RNG-RSPs.
[0094]
Accordingly, the scheduling section 213 described
above functions as a scheduling information production
section for producing a DL MAP (map) which is scheduling
information except for information to be complemented by

the relay section 318 of the relay station 3B described
above based on a message for the notification of the number
of Ranging Codes (ranging codes) received by the reception
section 211. In other words, the scheduling section 213
carries out, based on the information received by the
reception section 211, allocation of the number of bands
equal to the number of the Ranging Codes (ranging codes)
intensively collected to the information received by the
reception section 211 to produce a DL MAP (map) which is
scheduling information.
[0095]
The NW interface section 214 carries out an interface
process in order to signal the data from the radio terminal
4 received by the reception section 211, for example, to
a different network and carries out another interface
process for a signal from the different network destined
for a radio terminal 4. Further, the buffer section 2i5
(sic) carries out buffering for data from the NW interface
section 214 or a DL/UL MAP (map) produced by the scheduling
section 213 in order to allow transmission of the data
or the DL/UL MAP (map) from the transmission section 216
at a predetermined timing.
[0096]
The transmission section 216 transmits a signal or
a message from the buffer section 215(sic) to the relay
station 3B or the radio terminal 4-1. In particular, the
transmission section 216 transmits the DL MAP (map) which

is produced by the scheduling section 213 as described
above and wherein a region within a RNG-RSP is designated
as described above to the relay station 3B or the terminal
4-1.
Working Effect
In the second embodiment, since the relay station
SB and the radio base station 2B are individually configured
in such a manner as described above, for example, as
illustrated in the signal sequence of FIG. 9, the relay
station 3B can transmit a controlling message wherein
information of the Ranging Codes (ranging codes) #1 to
#3 from the radio terminals 4-21 to 4-23 is intensively
collected to the radio base station 2B, and can transmit
power/timing adjustment information corresponding to the
individual radio terminals 4-21 to 4-23 in RNG-RSP whose
region is designated by a DL MAP (map) from the radio base
station 2B while complementing the contents of the DL MAP
(map) and RNG-RSP.
[0097]
In particular, if the reception section 311 and the
Code reception section 312 of the relay station 3B receive,
for example. Ranging Codes (ranging codes) as signals and
messages from the plural radio terminals 4-21 to 4-23,
then information of the code number, frame position and
frame number which is information of the received Ranging
Codes (ranging codes) is stored as communication
controlling information for the communication control

between the radio terminals 4-21 to 4-23 and the relay
station 3B into the storage section 313 . Further, the Code
reception section 312 measures the reception power and
the reception timing from the reception signal of the
received Ranging Codes (ranging codes) and stores
power/timing adjustment information to the radio terminals
4-21 to 4-23 produced based on the result of the measurement
into the storage section 313.
[0098]
Further, the intensive collection section 314
intensively collects the information of the Ranging Codes
(ranging codes) from the radio terminals 4-21 to 4-23,
and the notification section 315 and the transmission
section 316 transmit the intensively collected information
to the radio base station 2B (refer to "RS Ranging Message
(ranging message)" in FIG. 9 and to FIG. 12).
Further, in the radio base station 2B, the reiception
section 211 and the controlling message extraction section
212 receive the intensively collected information
described above from the relay station 3B, and the
scheduling section 213 produces scheduling information
(DL MAP (map)) for the communication between the relay
station 3B and the individual radio terminals 4-21 to 4-23
based on the received intensively collected information.
Then, the buffer section 215 and the transmission section
216 transmit the scheduling information produced as
described above to the relay station 3B (refer to reference

character R3 in FIG. 9) . At this time, particular
power/timing adjustment information as a response to the
RangingCodes (ranging codes ) is not included in the RNG-RSP
whose region is designated by the DL MAP (map), and the
portion is left substantially as a blank space.
[0099]
The reception section 311 and DL MAP (map) extraction
section 317 of the relay station 3B receive the scheduling
information transmitted from the radio base station 2B,
and the relay section 318 complements the contents of the
DL MAP (map) which is the received scheduling information
in accordance with the communication controlling
information stored in the storage section 313 and writes
the power/timing adjustment information to the radio
terminals 4-21 to 4-23 into the RNG-RSP. Then, the
transmission section 316 transmits the power/timing
adjustment information to the radio terminals 4-21 to 4-23
through the RNG-RSP regions together with the scheduling
information whose contents are complemented.
[0100]
It is to be noted that each of the radio terminals
4-21 to 4-23 can extract the power/timing adjustment
information corresponding to the Ranging Code (ranging
code) transmitted from the radio terminal from the RNG-RSP
region while referring to the contents of the DL MAP (map) ,
and transmit a signal with transmission power and at a
timing in accordance with the extracted adjustment

information.
In this manner, with the second embodiment of the
present invention, there is an advantage that, since the
relay station 3 can complement information of the DL MAP
(map) corresponding to the radio terminals 4-21 to 4-23
and write power/timing adjustment information into the
RNG-RSP region, information to be transmitted to the radio
base station 2B can be reduced to achieve effective
utilization of a radio communication resource.
[0101]
It is to be noted that, while the case wherein the
plural radio terminals 4-21 to 4-23 are accommodated by
the relay station 3B is described in the second embodiment
described above, the present invention is not limited to
this, and, also in a case wherein one radio terminal is
accommodated, effective utilization of a radio
communication resource can be achieved similarly.
[c] Description of the Third Embodiment
In the third embodiment, a case is described wherein,
in a radio communication system which includes a radio
base station 2 and a radio terminal 4 and into which a
relay station 3 is installed similarly as in the cases
of the first and second embodiments described above, a
CQI (Channel Quality Indicator) report is received by the
relay station 3. It is to be noted that the CQI report
is used for the notification of radio signal quality in
the radio terminal 4-2 to the radio base station 2 through

the relay station 3. The radio base station 2 can receive
the CQI report from the radio terminal 4-2 at fixed cyclical
intervals and adaptively change over the radio
communication method to an optimum one based on the varying
value of the CQI. For example, if the reception quality
is good, then a radio communication method suitable for
high-speed communication can be applied, but, if the
reception quality is not good, then another radio
communication method which has a comparatively high
tolerance for a noise environment, although the
communication speed, is low can be applied. It is to be
noted that, for example, as the CQI, a CINR (Career to
Interference and Noise Ratio) which is a quality parameter
value which can be measured without decoding a reception
signal is available.
Outline of a Signal Sequence in the Third Embodiment
FIG. 14 is a view illustrating a signal sequence
regarding a CQI report to be transmitted from the radio
terminal 4-2 (refer to FIG. 1) and a response signal to
the CQI report in the third embodiment of the present
invention. As illustrated in FIG. 14, the relay station
3 carries out, when CQI reports PR1(Periodic Report) to
RP4 received in a fixed period from the connected radio
terminal 4-2 are received, comparison for every time of
the reception with CQI report information in the preceding
operation cycle stored in the relay station 3. It is to
be noted that, while description is given here taking notice

of a case wherein a CQI report is received from one radio
terminal 4-2 connecting to the relay station 3, the
description applies similarly also to a case wherein a
plurality of the radio terminals 4-2 are connected.
[0102]
Then, only when it is decided from a result of the
comparison that the radio communication method used
between the relay station 3 and the radio terminal 4-2
is to be changed, the relay station 3 issues a notification
of the information of the radio communication method to
be used between the relay station 3 and the radio terminal
4-2 to the radio base station 2. For example, the relay
station 3 compares, based on the contents of the CQI report
PR3 from the radio terminal 4-2, the contents of the CQI
report RP3 with the contents of the CQI report received
in the past (for example, the CQI report PR2 in the preceding
operation cycle) to decide whether or not the radio
communication method is to be changed and determine also
a radio communication method after the change. Then, the
relay station 3 issues a notification of the changing
information relating to the radio communication method
(MS Burst Profile Info).
[0103]
The radio base station 2 carries out scheduling based
on the information of the changed radio communication
method from the radio terminals 4-21 to 4-23 to produce
a DL/UL MAP (map) and transmits the produced DL/UL MAP

(map) to the relay station 3. Consequently, the
information amount to be communicated between the relay
station 3 and the radio base station 2 is reduced to achieve
effective utilization of a radio communication resource.
Configuration of the Relay Station in the Third
Embodiment
Taking notice of such a function for achieving
enhancement of the efficiency of a radio communication
resource as described above, the relay station 3 in the
third embodiment includes a reception section 321, a CQI
reception section 322, a storage section 323, a decision
section 324, a notification section 325 and a transmission
section 326 similarly to the relay station 3C shown in
FIG. 15.
[0104]
Here, the reception section 311 receives a signal
or a message from the radio terminal 4-2 and the radio
base station 2. Further, the CQI reception section 322
extracts a CQI report which is a signal or a message which
indicates a state of the radio channel from the signal
or the message from the radio terminal 4-2 received by
the reception section 321. Accordingly, the reception
section 321 and the CQI reception section 322 described
above configure a terminal side reception section for
receiving information of a signal and a message received
from a radio terminal.
[0105]

The storage section 323 stores the contents of the
CQI report from the radio terminal 4-2 received by the
CQI reception section 322 for each radio terminal 4-2.
Information to be stored into the storage section 323 is
illustrated in FIG. 16. As illustrated in FIG. 16, the
storage section 323 stores, for each radio terminal 4-2
connected to the relay station 3, also an MS ID which is
ID information of the radio terminal, a CINR value and
an index value of the radio communication method (Burst
Profile) suitable for the CINR value through a writing
action by the decision section 324 hereinafter described.
[0106]
Further, the decision section 324 decides based on
the information received by the CQI reception section 322
whether or not a notification of relating information
relating to the signal and the message received from the
radio terminal 4-2 is to be issued to the radio base station
2. In particular, when the radio communication method to
be used between the relay station 3 and the radio terminal
4-2 need to be changed based on the CQI information received
by the CQI reception section 322, that is, based on the
information relating to the radio channel state between
the relay station 3 and the radio terminal 4-2, the decision
section 324 decides that a notification of the information
relating to the radio channel state is to be issued to
the radio base station 2.
[0107]

In particular, the decision section 324 first refers
to a table not shown stored in the storage section 323
to extract and select a radio communication method suitable
for the information received by the CQI reception section
322. In other words, for example, when the quality is
comparatively high in response to the CINR value, the
decision section 324 extracts and selects a radio
communication method suitable for comparatively
high-speed transmission, but, when the quality is
comparatively low, the decision section 324 extracts and
selects a radio communication method which is suitable
for comparatively low-speed transmission and besides has
a comparatively high tolerance for noise . It is to be noted
that, as the radio communication method to be selected,
a modulation method, a coding method, a coding ratio and
so forth can be used as parameters (factors).
[0108]
Then, a difference between the radio communication
method extracted and selected in this manner and the radio
communication method extracted from the CINR value in the
CQI report received last and stored in the storage section
323 is decided. If the radio communication methods are
different from each other as a result of the decision,
then it is decided that the radio communication method
used between the relay station 3 and the radio terminal
4-2 needs to be changed to the newly extracted and selected
radio communication method, but, if the radio

communication methods are same as each other as a result
of the decision, then it is decided that the radio
communication method used between the relay station 3 and
the radio terminal 4-2 needs not to be changed.
[0109]
It is to be noted that, if such a decision regarding
the radio communication method as described above ends,
then the decision section 324 can write, for every time
of the end of the decision, the CINR value and the extracted
and selected radio communication method into the storage
section 323 in an associated relationship with the ID
information of the corresponding radio terminal 4-2.
When it is decided by the decision section 324 that
a notification of the changing information of the radio
communication method which is information relating to the
state of the radio channel received from the radio terminal
4-2 is to be issued to the radio base station 2 (that is,
the radio communication method is to be changed), the
notification section 325 produces, as a controlling
message, the changing information of the radio
communication method as relating information and outputs
the produced information to the transmission section 326
at the following stage. The transmission section 326
transmits the controlling message produced by the
notification section 325 to the radio base station 2.
Accordingly, the changing information of the radio
communication method described above is conveyed to the

radio base station 2 by cooperation of the notification
section 325 and the transmission section 326.
[0110]
On the other hand, when it is decided by the decision
section 324 that a notification of the changing information
of the radio communication method needs not to be issued
(that is, the radio communication method need not to be
changed), a notification of the changing information of
the radio communication method as the relating information
is not issued through the notification section 325 and
the transmission section 326,
FIG. 17 illustrates an example of information of
a controlling message to be transmitted from the relay
station 3C to the radio base station 2 for changing the
radio communication method. The information of the
controlling message can be configured from an ID of the
relay station 3 which indicates a transmission source of
the controlling message (RS ID), a type which indicates
the present controlling message (Message Type), an ID of
the radio terminal decided to be necessary to change the
radio communication method (MS ID) by the decision section
and an index value of the radio communication method to
be changed (Burst Profile).
[0111]
It is to be noted that the radio base station 2
recognizes the radio communication method to be used
between the relay station 3 and the radio terminal 4-2

based on the received controlling message and produces
a DL/UL MAP (map) based on the recognized radio
communication method.
•Working Effect
Since the relay station 3C in the third embodiment
is configured in such a manner as described above, when
the CQI reports PRl to PR4 received at fixed intervals
from the radio terminal 4-2 connected to the relay station
3C are received, the relay station 3C may not transmit,
for every time of reception, the contents of the CQI report
to the radio base station 2 in order to produce a DL/UL
MAP (map) , but may transmit the contents of the CQI report
only when it decides to be necessary to change the radio
communication method based on the contents of the CQI.
[0112]
In particular, the decision section 324 of the relay
station 3C carries out comparison between the CQI report
information in the preceding operation cycle stored in
the storage section 323 and the radio communication method
information obtained from the CQI report in the present
operation cycle. Then, only when it is decided from a
result of the comparison that the radio communication
method to be used between the relay station 3C and the
radio terminal 4-2 is to be changed, a notification of
the information of the radio communication method to be
used between the relay station 3 and the radio terminal
4-2 is issued as a controlling message to the radio base

station 2.
[0113]
In this manner, with the third embodiment, since
opportunities that the relay station 3C transmits a
controlling mess age relating to the contents of a CQI report
transmitted from the radio terminal 4-2 can be reduced
in comparison with those in a case wherein a controlling
message is transmitted for every time of reception of a
CQI report, there is an advantage that information to be
signaled to the radio base station 2B can be reduced to
achieve effective utilization of a radio communication
resource.
[b] Others
The present invention is not limited to the
embodiments specifically described above, and variations
and modifications can be made without departing from the
scope of the present invention.
[0114]
For example, while, in the relay stations 3A and
3B in the first and second embodiments described above,
the storage sections 303 and 313 store information of a
signal or a message in the upward direction from the radio
terminal 4-2 as communication controlling information,
the present invention is not limited to this, and, for
example, where information to be complemented as
scheduling information by the complementation section is
known, not the information of the signal or the message

in the upward direction from the radio terminal 4-2 but
the information just described may be stored in advance
in the storage sections 303 and 313.
[0115]
Further, with the relay station of the present
invention, also signals other than a band request signal
such as the BW Request Code (request code) described above
or a power/timing adjustment signal such as the Ranging
Code (ranging code) described above can be intensively
collected by the intensive collection section, and as a
result, effective utilization of a band can be achieved.
Further, the apparatus of the present invention can
be fabricated by a person skilled in the art based on the
disclosure of the embodiments described above.

CLAIMS
1. A relay station which relays a signal to be
transferred between a radio base station and a, radio
terminal, the relay station comprising:
a storage section adapted to store communication
controlling information for communication control with
the radio terminal;
a base station side signal reception section adapted
to receive, from the radio base station, scheduling
information in communication between the relay station
and the radio terminal;
a complementation section adapted to complement
contents of the scheduling information and the control
message receivedby saidbase station side signal reception
section in accordance with the communication controlling
information stored in said storage section; and
a terminal side signal transmission section adapted
to transmit the scheduling information and the control
message whose contents are complemented by said
complementation section to the radio terminal.
2. The relay station as claimed in claim 1, further
comprising:
a terminal side signal reception section adapted
to receive a signal and a message from the radio terminal
and store information of the received signal and message

as the communication controlling information into said
storage section;
an intensive collection section adapted to
intensively collect the information of the signal and
message from the radio terminal; and
a base station side signal transmission section
adapted to transmit the information intensively collected
by said intensive collection section to the radio base
station in order to produce the scheduling information.
3. The relay station as claimed in claim 2, wherein
said terminal side signal reception section receives
signals and messages from a plurality of radio terminals
and stores information of the received signals andmessages
as the communication controlling information into said
storage section;
said intensive collection section intensively
collects the information of the signals and messages from
the plural radio terminals into one piece of information;
and
said complementation section complements the
contents of the scheduling information and the control
messages received by said base station side signal
reception section in an associated relationship with
communication controlling information of each of the
plural radio terminals in accordance with the
communication controlling information stored in said

storage section.
4. The relay station as claimed in claim 2, wherein
said terminal side signal reception section receives band
request signals from the radio terminals and stores, as
the communication controlling information, kind
information of the band request signals and position
information of the band request signals in a terminal
transmission region as information of the received band
request signals into said storage section;
said intensive collection section intensively
collects the information of the band request signals from
the radio terminal; and
said complementation section complements,
regarding the scheduling information received by said
reception section, the kind information of the band request
signals and the position information of the band request
signals in the terminal transmission region stored in said
storage section.
5. The relay station as claimed in claim 2, wherein
said terminal side signal reception section receives
power/timing adjustment signals from the radio terminal
and produces power/timing adjustment information for the
corresponding radio terminals from the received
power/timing adjustment signals and then stores kind
information of the power/timing adjustment signals and

position information of the power/timing adjustment
signals in a terminal transmission region as the
communication controlling information into said storage
section together with the produced power/timing adjustment
information;
said intensive collection section collects
information of the power/timing adjustment signals from
the radio terminals;
said complementation section complements,
regarding the control messages received by said reception
section, the kind information of the power/timing
adjustment signals and the position information of the
power/timing adjustment signals in the terminal
transmission region stored in said storage section; and
said terminal side signal transmission section
transmits the power/timing adjustment information
corresponding to the power/timing adjustment signals
stored in said storage section to the radio terminals
together with the control messages whose contents are
complemented by said complementation section.
6. A relay station which relays a signal to be
transferred between a radio base station and a radio
terminal, the relay station comprising:
a terminal side reception section adapted to receive
information of a signal and a message transmitted from
the radio terminal;

a decision section adapted, to decide based on the
information received by said terminal side reception
section whether or not a notification of the information
relating to the signal and the message received from the
radio terminal is to be issued to the radio base station;
and
a notification section adapted to issue the
notification of the relating information to the radio base
station when it is decided by said decision section that
the notification of the information relating to the signal
and message received from the radio terminal is tobe issued
to the radio base station.
7. The relay station as claimed in claim 6, wherein
said terminal side reception section receives information
of a signal and a message relating to a radio channel state
between the relay station and the radio terminal
transmitted from the radio terminal;
said decision section decides, based on the
information relating to the radio channel state between
the relay station and the radio terminal received by said
reception section, that a notification of the relating
information is to be issued to the radio base station when
a radio communication method used between the relay station
and the radio terminal need be changed; and
said notification section issues, when it is decided
by said decision section that the radio communication

method need be changed, a notification of at least one
of the radio channel information and the radio
communication method between the relay station and the
radio terminal as a notification of the relating
information to the radio base station.
8 . A radio base station for transmitting and receiving
a signal to and from a radio terminal through the relay
station as claimed in claim 2, the radio base station
comprising:
a reception section adapted to receive information
from the base station side signal transmission section
of the relay station;
a scheduling information production section adapted
to produce the scheduling information and the control
message except for information to be complemented by said
complementation section of the relay station based on the
information received by said reception section; and
a transmission section adapted to transmit the
scheduling information and the control message produced
by said scheduling information production section to the
relay station.
9. A radio base station for transmitting and receiving
a signal to and from radio terminals through the relay
station as claimed in claim 4, the radio base station
comprising:

a reception section adapted to receive information
from the base station side signal transmission section
of the relay station;
a scheduling information production section adapted
to produce the scheduling information based on the
information received by said reception section for which
band allocation by the number equal to the number of band
request signals intensively collected in the information
received by said reception section is carried out; and
a transmission section adapted to transmit the
scheduling information produced by said scheduling
information production section to the relay station.
10. A radio base station for transmitting and receiving
a signal to and from radio terminals through the relay
station as claimed in claim 5, the radio base station
comprising:
a reception section adapted to receive information
from said base station side signal transmission section
of the relay station;
a scheduling information production section adapted
to produce the control messages based on the information
received by said reception section for which band
allocationby the number equal to the number of power/timing
adjustment signals intensively collected in the received
information is carried out; and
a transmission section adapted to transmit the

control messages produced by said scheduling information
production section to the relay station.
11. A radio communication system comprising radio
terminals, a radio base station for transmitting and
receiving signals to and from the radio terminals, and
a relay station for relaying a signal to be transferred
between the radio terminals and the radio base station;
the relay station comprising:
a terminal side signal reception section adapted
to receive signals and messages from the radio terminal;
a storage section adapted to store information of
the signals and messages received by the terminal side
reception section as communication controlling
information for communication control between the radio
terminals and the relay station;
an intensive collection section adapted to
intensively collect the information of the signals and
the messages from the radio terminals; and
a base station side transmission section adapted
to transmit the information intensively collected by the
intensive collection section to the radio base station;
the radio base station comprising:
a reception section adapted to receive information
from the base station side signal transmission section
of the relay station;
a scheduling information production section adapted

to produce scheduling information and control messages
in communication between the relay station and the radio
terminals except for information to be complemented by
the complementation section of the relay station based
on the information received by the reception section; and
a transmission section adapted to transmit the
scheduling information produced by the scheduling
information production section to the relay station;
the relay station further comprising:
a base station side signal reception section adapted
to receive the scheduling information from the radio base
station;
a complementation section adapted to complement
contents of the scheduling information and the control
messages received by the base station side signal reception
section in accordance with the communication controlling
information stored in the storage section; and
a terminal side signal transmission section adapted
to transmit the scheduling information and the control
messages whose contents are complemented by the
complementation section to the radio terminals.
12. A radio communication system comprising a radio
terminal, a radio base station for transmitting and
receiving a signal to and from the radio terminal, and
a relay station for relaying a signal transferred between
the radio terminal and the radio base station;

the relay station comprising:
a radio channel state reception section adapted to
receive information of a signal and a message relating
to a radio channel state between the relay station and
the radio terminal from the radio terminal;
a decision section adapted to decide based on the
information received by the channel state reception
section whether or not a radio communication method to
be used between the relay station and the radio terminal
need to be changed; and
a notification section adapted to issue, when it
is decided by the decision section that the radio
communication method needs to be changed, a notification
of at least one of radio channel information and ths radio
communication method between the relay station and the
radio terminal as relating information to the radio base
station;
the radio base station comprising:
a scheduling information production section adapted
to change a radio communication method to be used between
the radio base station and the radio terminal through the
relay station and produce scheduling information in
communication wherein the radio communication method is
changed based on the relating information issued from the
notification section; and
a transmission section adapted to transmit the
scheduling information produced by the scheduling

information production section to the relay station.
13. The radio communication system as claimed in claim
12 , wherein the radio communication method which is atarget
of the change includes a modulation method, a coding method
and a coding ratio as elements thereof.
14. A radio communication method by radio terminals,
a radio base station for transmitting and receiving signals
to and from the radio terminals and a relay station for
relaying a signal to be transferred between the radio
terminals and the radio base station, the method
comprising:
in the relay station:
receiving signals and messages from the radio
terminals;
storing information of the received signals and
messages as communication controlling information for
communication control between the radio terminals and the
relay station;
intensively collecting the information of the
signals and messages from the radio terminals; and
transmitting the intensively collected information
to the radio base station;
in the radio base station:
receiving the intensively collected information
from the relay station;

producing scheduling information and control
messages for communication between the relay station and
the radio terminal based on the received intensively
collected information; and
transmitting the scheduling information and the
control messages to the relay station; and
in the relay station:
receiving the scheduling information transmitted
from the radio base station;
complementing contents of the received scheduling
information and the control messages in accordance with
the stored communication controlling information; and
transmitting the scheduling information whose
contents are complemented to the radio terminals.
15. A relay station interposed between a radio base
station and radio terminals for carrying out a relay process,
the relay station comprising:
a storage section adapted to store information
obtained by reception of signals from the radio terminals;
a notification section adapted to issue to the radio
base station a notification of securing of a transmission
region in an upward direction based on the received signal;
a reception section adapted to receive transmission
region information in the upward direction in the relay
station secured by the radio base station in accordance
with the notification; and

a transmission section adapted to add contents to
the transmission region information based on the
information stored in said storage section and transmit
the transmission region information to which the contents
are added in a downward direction.

In order to achieve effective utilization of radio communication resource, there is provided a relay station (3A), for relaying a signal to be transferred between a radio base station and a radio terminal, which includes a storage section (303) adapted to store communication
controlling information for communication control with the radio terminal, a base station side signal reception section (301) adapted to receive, from the radio base station, scheduling information in communication between
the radio base station and the radio terminal through the relay station (3A), a complementation section (308) adapted to complement contents of the scheduling
information received by the base station side signal reception section (301) in accordance with the communication controlling information stored in the storage section (303) , and a terminal side signal transmission section (306) adapted to transmit the scheduling information whose contents are complemented by the complementation section to the radio terminal.