1. A transmission device comprising: a coilnecting unit that connects transmission data of each a plurality of serving cells; an adding unit that adds active state information that indicates whether the state of each of said plurality of serving cells is the active state to said transmission data that were connected to generate a transmission sequence; and a transmission unit that transmits said transmission sequence that was generated. 10 2. The transmission device as set forth in claim 1, wherein said adding unit comprises: a conversion unit that converts active state information of each of said plurality of serving cells to a scrambli~~cogd e identifier; a scrambling code generation unit that generates scrambling code in accordance with said scrambling code identifier that was converted; and 15 a scrambling unit that uses said scrambling code that was generated to carry out scrambling of said transmission data that were connected.

3. The transmission device as set forth in claim 1, wherein said adding unit comprises: a conversion unit tliat converts active state information of each of said plurality of serving 20 cells to a cyclic shift amount; and a cyclic shift unit that carries out cyclic shifting of said transmission data that were connected ill accordance with said cyclic shift amount tliat was converted.

4. A reception device comprising: 25 a reception unit that receives from a transmission device a transmission sequence in which tra~lsmissiond ata of each of a plurality of serving cells are connected and active state information that indicates whether the state of each of said plurality of serving cells is the active state is added to said transmissioll data that were connected; a restoration unit tliat restores the active state information of each of said plurality of 30 serving cells based on said traiisinission sequelice that was received; and a separation unit that, based on active state information of each of said plurality of serving cells that were restored, separates transmission data of each of said plurality of serving cells from said traiisnlission data that were connected.

5. The reception device as set forth in claim 4, wherein: said transmission sequence is realized by scrambling of said trallsinission data that were connected, by using a scrambling code that accords with a scrambling code identifier obtained by converting active state information of each of said plurality of serving cells, and moreover, said 5 transinission sequence is realized by adding CRC code to said transmission data that were connected; said restoration unit includes: a conversion unit that convei-ts candidates of active state information of each of said plurality of serving cells to scrambling code identifiers; 10 a scrambling code generation unit that generates scrambling code in accordance with said scrambling code identifiers that were converted; a scrambling unit that generates, for said transmission sequence, candidates of said transmission data that were connected by carrying out scrambling using said scrambling code that was generated; 15 a CRC checking unit that carries out CRC checking of candidates of said transmission data that were connected; and an information control unit that successively changes candidates of active state information of each of said plurality of serving cells such that said CRC checking results become correct and that takes the candidate of active state information of' each of said plurality of serving cells when 20 said CRC checking result is correct as the active state information of each of said plurality of serving cells that were restored; and said separation unit, based on said active state informatioil of each of said plurality of serving cells that were restored, separates transmission data of each of said plurality of serving cells from the candidate of connected transmission data at the time said CRC checking result is 25 correct.

6. The reception device as set forth in claim 4, wherein: said transmission sequence is realized by carrying out cyclic shifting of said transmission data that were connected in accordance with a cyclic shift amount obtained by convertiilg active 30 state information of each of said plurality of serving cells, and moreover, said trallslnission sequence is realized by adding CRC code to said trallslnission data that were conrlected; said restoratioll unit includes: a conversion unit that converts candidates of active state inforn~ationo f each of said plurality of serving cells to cyclic shift aamounts; a reverse cyclic shift unit that, by carrying out reverse cyclic shifting of said translnission sequence in accordance wit11 said cyclic shift amounts that were convel-ted, generates candidates of said transmission data that were connected; a CRC checking unit that carries out CRC checking of candidates of said transmission data 5 that were connected; and an information control unit that sequentially changes candidates of active state information of each of said plurality of serving cells such that said CRC checking results become correct and that takes the candidate of active state information of each of said plurality of serving cells when said CRC checking result is correct as the active state information of each of said plurality of 10 serving cells that were restored; and said separation unit, based on said active state information of each of said plurality of serving cells that were restored, separates transmission data of each of said plurality of serving cells from the candidate of connected transmission data at the time said CRC checking result was correct.

7. The reception device as set forth in any one of claims 4 to 6, further comprising: a control unit that, based on active state information of each of said plurality of serving cells that were restored, determines whether said transmission device is to be activated or deactivated; and 2 0 a transmission unit that, based on said determination result, transmits active state control information that instructs activation or deactivation of said transmission device.

8. A transmission method realized by a trallslnission device and comprising: connecting transmission data of each of a plurality of serving cells; 2 5 adding active state information that indicates whether the state of each of said plurality of serving cells is the active state to said transmission data that were connected to generate a transmission sequence; and transmitting said transmission sequence that was generated.

9. A reception method realized by a reception device and comprising: receiving from a transmission device a transmission sequence realized by connecting transmission data, of each of a plurality of serving cells, and adding active state information that indicates whether the state ol'each of said plurality of serving cells is the active state, to said trallsmission data that were connected; based on said translnission sequence that was received, restoring active state informati011 of each of said plurality of serving cells; and based on active state informati011 of each of said plurality of serving cells that were restored, separating transmissio~id ata of each of said plurality of serving cells fro111 the 5 transmission data that were connected.

Title of the Invention
Transmission Device, Reception Device, Transmission Method, and Reception Method
Technical Field
5 [OOOl]
The present invention relates to a transmission device, a reception device, a transmission
method and a reception method.
Background Art
10 [0002]
LTE-Advanced is generally known as a developed form of LTE (Long Term Evolution)
that is a radio communication method prescribed by 3GPP (Third Generation Partnership
Project).
[0003]
15 In LTE-Advanced, the implementation of carrier aggregation is agreed upon. Carrier
aggregation is a method in which a single mobile station carries out uplink or downliizl<
colnmunication by simultaneously using a plurality of carriers. Each of the plurality of carriers
that is used at the time of carrier aggregation is referred to as a conlponent carrier (CC).
[0004]
20 Here, a cell that is connected to the mobile station and that can bc used in communication is
referred to as a serving cell. Among serving cells, the cell that is initially set when establishing a
connection of the mobile station is the primary serving cell (PCell), and a cell that is set after
establishing connection is referred to as a secondary serving cell (SCell).
[0005]
2 5 According to Non-Patent Document 1, a mobile station is able to switch the state of each
SCell between active state and inactive state. A mobile station does not carry out uplink
communication using an SCell in the inactive state, and fui-ther, for such an SCell in inactive
state, does not measure quality, does not report Channel State Information (CSI) to a base
station, and does not monitor Physical Downlink Control Channels (PDCCII).
30 [0006]
There are two methods, the following first method and secoi~dm ethod, for switching an
SCell in the active state to the inactive state.
[0007]
I11 the first method, a basc station transinits to a mobile station an MAC (Media Access
Control) coiltrol element for causing deactivatioil. The mobile station, upon receiving the MAC
control element that instructs deactivation of a particular SCell, causes the transition of the state
of the SCell to the inactive state.
[OOOS]
5 In the second method, no uplink or downlink communication resources that use PDCCH
are allocated to a mobile station by the time of expiration of timers for each SCell in the mobile
station. The mobile station similarly causes the state of a particular SCell to transition to the
inactive state when there is no allocation of the above-described resources by the expiration of
the timer for the particular SCell.
10 [0009]
In the method of switching an SCell that is in the inactive state to the active state, a base
station transmits a MAC control element that instructs activation. The mobile station, upon
receiving the MAC control element that instructs the activation of a particular SCell, causes the
transition of the state of the SCell to the active state.
15 [OOlO]
The chief object of providing the above-described second method (deactivation resulting
from expiration of timers) other than the above-described first method (transmission of MAC
control information that instructs deactivation) is for the purpose of protection when the mobile
station is unable to accurately receive the MAC control information that is transmitted in the
20 above-described first method. In this case, the failure to accurately receive the MAC control
information that instructs deactivation of a particular SCell results in the possibility that the base
station and the mobile station will each have different perceptions such that the mobile station
will continue to perceive the SCell as still in the active state whereas the base station will
perceive the SCell as being in the inactive state. The above-described second method enables
25 solving this problem, and according to the above-described second method, after the passage of a
fixed time interval (the expiration of a timer), the disagreement in perception between the base
station and the mobile station relating to the state of the SCell can be eliminated.
roo1 11
However, due to the existence of the above-described second method, a new problem arises
30 in which "in the iilterval that the base station perceives the active state, the mobile station
autonomously transitions to the inactive state, with the result that disagreement occurs between
the perceptions of the base station and mobile station," as will next be explained. The mechanism
of the occurrence of this phenomenon is next described more concretely.
[OO 1 21
Even if a base station uses PDCCH for a particular SCell and i~lstructsth e allocation of
communication resources, the reception of PDCCH may fail due to the reception quality of the
mobile station and communicatioil resources may not be allocated to this SCell. As described
hereinabove, when the allocation of communication resources does not succeed by the time of
5 expiration of the timer of a mobile station, the mobile station switches the SCell to the inactive
state. At this time, the base station perceives the same SCell as being in the active state, but
because the mobile station perceives the inactive state, a disagreement in the perception of the
state of the SCell arises.
[00 131
10 However, according to Non-Patent Docuinent 2, in Aperiodic CSI transmission, a mobile
station is able to transmit a maximum of a 5-serving-cell portion of CSI on one serving cell.
Here, CSI includes a channel quality indicator (CQI), a Pre-coding Matrix Indicator (PMI), and a
Rank Indicator (RI).
[00 1 41
15 According to Non-Patent Document 3, a unique serving cell index is given to each serving
cell within a mobile station. In this case, the serving cell index of a PCell is always "0."
[00 1 51
According to Non-Patent Document 4, the CQIIPMI and RI of each serving cell are each
connected in the order of serving cell indices and transmitted on one serving cell. At this time,
20 the CQIIPMI or RI of a serving cell in the inactive state is not connected.
[00 161
In addition, accorditlg to Non-Patent Document 4, when the total nunlber of bits of
CQIIPMI that are connected as described hereinabove is 12 or more, an 8-bit Cyclic Redundancy
Check (CRC) code is added to enable error detection. On the other hand, when the number of
25 bits is 11 or less, a CRC code is not added and error detection is not possible.
Literature of the Prior Art
Notz-Prrtent Docunzerzts
[0017]
30 Non-Patent Document 1 : 3GPP, "3GPP TS36.321 v10.4.0," Dec. 201 1
Non-Patent Document 2: 3GPP, "3GPP 'TS36.213 v10.4.0," Dec. 201 1
Non-Patent Document 3: 3GPP, "3GPP TS36.331 v10.4.0," Dec. 201 1
Notl-Patent Document 4: 3GPP, "3GPP 7336.212 v10.4.0," Dec. 201 1
Summary of the Invention
Problem to be Solved by the Invention
[00 181
When a disagreement in perception of the state of each serving cell arises between a base
5 station and a mobile station, a disagreement in the perception regarding the total sequence length
of CQIIPMI and RI will also arise between the base station and the mobile station.
[00 1 91
In a configuration of the related art, an active state indicator that shows whether the state of
each serving cell is active or deactive is not added to the connected CQIIPMI and RI itself.
10 Accordingly, when the above-described disagreement in perception arises, the base station is
required to determine the serving cell to which the CQIIPMI and RI are connected.
[002O]
At this time, a CRC code was added if the number of bits of the connected CQIIPMI was
12 or more, and an error of the entire connected CQIIPMI could be detected on the base station
15 side. However, in cases such as when the CQIIPMI sequence length of each serving cell is equal,
among a plurality of serving cells, the serving cell to which the CQIIPMI was connected could
not be identified by the base station.
[002 11
As an example, a case is considered in which, as in FIG. 1, the sequence lengths of
20 CQIIPMI in four serving cells are all equally 0, and, due to the above-described disagreement in
perception, transmitted lacking the CQIIPMI of one serving cell. In this case, at the base station,
decoding is attempted assuming that the connected CQIIPMI sequence length is 4 0, based on
the immediately preceding active state information of each serving cell. However, this assumed
sequence length differs from the sequence length 3 0, that was actually transmitted, and the
25 CRC check result is incorrect. It is next assumed that the CQIIPMI has been lost from one
serving cell, and decoding attempted on the assuinption that the connected CQIIPMI sequence
length is 3 0,. In this case, the sequence length itself matches the length that was actually
transmitted, and as a result, the CRC check result is correct. However, although it is established
that the connected CQIIPMI sequence length is 3 O,, there are four candidates that are to be
30 combined as serving cells to which the CQIIPMI are coilnected, and the combination cannot be
identified. Accordingly, although it is ascertained in the base station that one serving cell is in
the inactive state, it is not clear which serving cell is in the inactive state.
[0022]
'To sun~marizeth e discussion above, the first problem of the related configuration is that, in
the event of a disagreement in perception between a base station and a mobile station regarding
the state of each serving cell, the actual combination of serving cells represented by the CQIIPMI
that are connected on the mobile station side cannot be uniquely identified on the base station
side, and the connected CQIIPMI cannot be correctly separated for each serving cell. As a result,
5 the CQIIPMI are discarded as indefinite information and communication resources are wasted.
[0023]
The second problem of the related configuration is that the active state information of each
serving cell cannot be clearly shared by the base station and mobile station. As a result, the state
control and the allocation of communication resources by the base station are performed
10 inefficiently based on erroneous serving cell states.
100241
It is therefore an object of the present invention to provide a technology that is capable of
solving any of the above-described problems.
Means for Solving the Problem
15 [0025]
The transmission device according to the present invention includes:
a connecting unit that connects transmission data of each a plurality of serving cells;
an adding unit that adds active state information, which indicates whether the state of each
of the plurality of serving cells is the active state, to the transmission data that were connected to
20 generate a transmission sequence; and
a transmission unit that transinits the transmission sequence that was generated.
100261
The reception device of the present invention includes:
a reception unit that receives from a transmission device a transmission sequence in which
25 the transmission data of each of a plurality of serving cells are connected, and active state
information that indicates whether the state of each of the plurality of serving cells is the active
state is added to the transmission data that were connected;
a restoration unit that restores the active state information of each of the plurality of serving
cells based on the transmission sequence that was received; and
3 0 a separation unit that, based on the active state information of each of the plurality of
serving cells that were rcstored, separates transmission data of each of the plurality of serving
cells from the transmission data that were connected.
100271
The transinission method of the present invei~tioni s a transn~issionm cthod realized by a
transinission device and includes steps of:
connecting transmission data of each of a plurality of serving cells;
adding active state information, which indicates whether the state of each of the plurality of
serving cells is the active state, to the transmission data that were connected to generate a
5 transmission sequence; and
transmitting the transmission sequence that was generated.
[0028]
The reception method of the present invention is a reception method realized by a reception
device and includes steps of:
10 receiving, from a transmission device, a transmission sequence in which transmission data
of each of a plurality of serving cells are connected and to which active state information, which
indicates whether the state of each of the plurality of serving cells is the active state, is added;
based on the transmission sequence that was received, restoring the active state information
of each of the plurality of serving cells; and
15 based on the active state information of each of the plurality of serving cells that were
restored, separating the transmission data of each of the plurality of serving cells from the
transmission data that were connected.
Effect of the Invention
20 LO0291
According to the present invention, a transmission device adds active state information of
each of a plurality of serving cells to transmission data that have been connected and transmits
the result.
1003 01
25 As a result, the effect is obtained in which a reception device, by restoring the active state
information, is able to comprehend the state of each of the serving cells that was perceived by
the transnlission device, whereby the transmission data that were connected can be correctly
separated for each serving cell.
30 Brief 1)escription of the Drawings
[003 11
FIG. 1 is a view for describing tlie problems of the present invention.
FIG. 2 is a block diagram showing tlie configuration of the CQIIPMI generation ~iilito f the
first exenlplary ei~lbodimento f the present inventioi~.
FIG. 3 is a block diagram showing the configuration of the CQIIPMI decoding unit of the
first exemplary embodiment of the present invention.
FIG. 4 is a block diagram showing the configuration of a mobile station of the first
exemplary embodiment of the present invention.
5 FIG. 5 is a block diagram showing the configuration of the base station of the first
exemplary embodiment of the present invention.
FIG. 6 is a flow chart for describing the CQIIPMI generation procedure in the mobile
station of the first exemplary embodiment of the present invention.
FIG. 7 is a flow chart for describing the CQIIPMI decoding procedure in the base station of
10 the first exemplary embodiment of the present invention.
FIG. 8 is a block diagram showing the configuration of the CQIIPMI generation unit of the
second exemplary embodiment of the present invention.
FIG. 9 is a block diagram showing the configuration of the CQIIPMI decoding unit of the
second exemplary embodiment of the present invention.
15 FIG. 10 is a flow chart for describing the CQIIPMI generation procedure in the mobile
station of the second exemplary embodiment of the present invention.
FIG. 11 is a flow chart for describing the CQIIPMI decoding procedure in the base station
of the second exemplary embodiment of the present invention.
FIG. 12 is a block diagram showing the coilfiguration of the base station of the third
20 exemplary embodiment of the present invention.
Mode for Carrying Out the Invention
COO321
Modes of call-ying out the present invention are next described with reference to the
25 accompanying drawings.
[0033]
In the interest of simplification, active state information that indicates whether each state of
a plurality of serving cells is the active state will be referred to as simply "serving cell
information."
30 (1) First Exe~zplnryE mbodiment
FIG. 2 is a block diagram showing the configuration of CQIIPMI generation unit 200 of the
first exe~nplarye mbodiment of the present invention. CQIIPMI generation unit 200 is provided
in the transmission device (a mobile station in the present exe~nplarye mbodiment).
100341
CQIIPMI generation unit 200 shown in FIG. 2 includes scrambling code identifier
conversion unit 201, scrambling code generation unit 203, scrambling unit 205, CQIIPMI
connecting unit 207, and CRC generation unit 209. In FIG. 2, the adding unit is made up of
scrambling code identifier conversion unit 201, scrambling code generation unit 203 and
5 scrambling unit 205.
[0035]
Scrambling code identifier conversion unit 201 takes as input serving cell information that
is held by the mobile station, converts the states of serving cells to scrambling code identifiers
and supplies the output to scrambling code generation unit 203.
10 COO361
Scrambling code generation unit 203 takes as input the scrambling code identifiers that
were supplied from scrambling code identifier conversion unit 201, generates scrambling codes
and supplies the result to scrambling unit 205.
[003 71
15 CQIIPMI connecting unit 207 takes as input the serving cell information and the CQIIPMI
of each serving cell that is held by the mobile station; based on the serving cell information,
connects the CQIIPMI of serving cells in the active state in the order of serving cell indices; and
supplies the result to scrambling unit 205 and CRC generation unit 209.
[003 81
20 CRC generation unit 209 takes as input the connected CQIIPMI that was supplied from
CQIIPMI connecting unit 207 and generates and supplies CRC code.
COO391
Scrambling unit 205 takes as input the scrambling codes supplied from scrambling code
generation unit 203 and the connected CQIIPMI that was supplied fsom CQIIPMI connecting
25 unit 207, uses the scrambling codes to scramble the connected CQIIPMI, and supplies a
CQIIPMI transmission sequence.
[0040]
FIG. 3 is a block diagram showing the configuration of CQIIPMI decoding unit 300 of the
first exemplary embodiment of the prescnt invention. CQIIPMI decoding unit 300 is provided in
30 the reception device (in the present exemplary embodiment, the base station).
[004 11
CQIIPMI decoding unit 300 shown in FIG. 3 includes decoding unit 301, scrambling code
identifier conversioll unit 201, scrambling code generation unit 203, scralnbling unit 205,
CQIIPMI separation unit 303, serving cell information control unit 305, and CRC checking unit
307. In FIG. 3, the restoration unit is made up of decoding unit 301, scrambling code identifier
conversion unit 20 1, serving cell information control unit 305, scrambling code generation unit
203, scrambling unit 205, serving cell information control unit 305, and CRC checking unit 307.
[0042]
5 Decoding unit 30 1 takes as input a received sequence that is received fro~na mobile station
(the CQIIPMI received sequence corresponding to the above-described CQIIPMI transmission
sequence, or a CQIIPMI received sequence to which CRC code has been added) and serving cell
information that is supplied from serving cell information control unit 305, and after calculating
the sequence length of CQIIPMI in the received sequence based on serving cell information,
10 decodes the CQIIPMI received sequence (or CQIIPMI received sequence to which CRC code has
been added) and supplies the result to scrambling unit 205.
[0043]
Scrambling code identifier conversion unit 201, scrambling code generation unit 203 and
scrambling unit 205 have the same functions as the blocks to which the same reference numbers
15 were given in FIG. 2.
[0044]
In other words, scrambling code identifier conversion unit 20 1 takes as input the serving
cell information that was supplied from serving cell information control unit 305, converts the
states of the serving cells to scrambling code identifiers, and supplies the result to scralnbling
20 code generation unit 203.
[0045]
Scrambling code generation unit 203 takes as input the scrambling code identifiers that
were supplied fro~nsc rambling code identifier conversion unit 201, generates scrambling codcs
and supplies the result to scrambling unit 205.
25 100461
Scrambling unit 205 takes as input the scrambling codes that were supplied from
scra~nblingc ode generation unit 203 and the CQIIPMI received sequence (or CQIIPMI received
sequence to which CRC code has been added) that was supplied from decoding unit 30 1, uses
the scrambling codes to carry out scrainbling of the CQIIPMI received sequence, and supplies
30 candidates of the connected CQIIPMI sequence to CQIIPMI separation unit 303 and CRC
checking unit 307. Wl~eCi~R C code has been added to the CQIIPMI received sequence, CRC
code is added to thc candidates of the connected CQIIPMI sequence supplied to CRC checking
unit 307.
LO0471
CQIIPMI separation unit 303 takes as input the candidates of the connected CQIIPMI
sequence that was supplied from scrambling unit 205 and serving cell information that was
supplied from serving cell inforination control unit 305, separates CQIIPMI of the serving cells
in the active state in the order of serving cell indices from the candidates of the connected
5 CQIIPMI sequence based on serving cell information, and supplies the CQIIPMI of each serving
cell.
[0048]
CRC checking unit 307 takes as input the candidates of the connected CQIIPMI sequence
that was supplied from scrambling unit 205, carries out CRC checking of the candidates of the
10 connected CQIIPMI sequence, and supplies the results of CRC checking to serving cell
information control unit 3 05.
[0049]
Serving cell information control unit 305 takes as input the CRC check results supplied
from CRC checking unit 307, and based on the CRC check results, restores the serving cell
15 information of the mobile station. More specifically, serving cell information control unit 305
successively changes the candidates of serving cell information until the CRC check results are
correct and supplies the result, and takes the candidate of serving cell illformation at the time the
CRC check result was correct as the restorcd serving cell information of the mobile station.
[OOSO]
2 0 FIG. 4 is a block diagram showing the configuration of mobile station 400 of the first
exemplary embodiment of the present invention.
[OOS 11
Mobile station 400 shown in FIG. 4 includes CQIIPMI generation unit 200, coding unit
401, transmission unit 403, radio control unit 405 and antenna 407.
25 [0052]
CQIIPMI generation unit 200 is a component in which CQIIPMI generation unit 200 of
FIG. 2 is used in mobile station 400.
[0053]
CQIIPMI generation unit 200 takes as input serving cell information and the CQIIPMI of
30 each serving cell that is held by mobile station 400 and supplies CQIIPMI transmission
sequences and CRC code to coding unit 401.
roo541
Bccause coding unit 401, transmission unit 403, radio control unit 405, and antenna 407 are
well known to those in the art, and furthcr, have 110 direct relation to the present invention,
details of the configuration are omitted from the figures and explanation. In addition, other
blocks that perform processes illherent to a mobile station are not characteristic parts of the
present invention and are therefore omitted from FIG. 4.
[OOSS]
5 FIG. 5 is a block diagram showing the configuration of base station 500 of the first
exemplary embodiment of the present invention.
[0056]
Base station 500 shown in FIG. 5 includes CQIIPMI decoding unit 300, reception unit 501,
radio control unit 503 and antenna 505.
10 [0057]
CQIIPMI decoding unit 300 is a component in which CQIIPMI decoding unit 300 of FIG. 3
is used in base station 500.
[OOSS]
CQIIPMI decoding unit 300 takes as input the received sequence received from mobile
15 station 400 and serving cell information that is held by base station 500 and supplies CQIIPMI of
each serving cell and serving cell information.
[0059]
Because reception unit 501, radio control unit 503, and antenna 505 are well known to
those in the art, and further, have no direct relation to the present invention, detailed
20 configuration is omitted fsom the figures and explanation. Other blocks that perform processes
inherent to a base station are not characteristic parts of the present invention and are therefore
also omitted fiom FIG. 5.
[0060]
The operation of the present exemplary embodiment is next described.
25 [0061]
The performance of scrambling of a CQIIPMI sequence is a characteristic feature of the
present exemplary embodiment. Scrambling refers to obtaining a new sequence by taking the
EXCLUSIVE-OR operation of a sequence and scrambling code. In this case, by subjecting the
sequence that follows scrambling to scrambling that uses the same scrambling code, the original
30 sequence is restored.
[0062]
In the present exemplary embodiment, a connected CQIIPMI sequence is subjected to
scrambling in mobile station 400 using a scrambling code that accords with the serving cell
information. Becausc CRC code is calculated based on the CQIIPMI sequence that precedes
scrambling, the CRC check result will be incossect unless the same scrambling code is used in
base station 500 to restore the original CQIIPMI sequence. Accordingly, when the CRC check
result is correct, the serving cell illforrnatioll is seen as matching between base station 500 and
mobile station 400.
6 [0063]
FIG. 6 is a flow chart for describing the CQIJPMI generation procedure in mobile station
400 of the present exemplary embodiment.
[0064]
As shown in FIG. 6, CQIJPMI connecting unit 207 first, in Step S601, determines serving
10 cells in the active state based on the serving cell information held by mobile station 400 and then
connects the CQIIPMI of serving cells in the active state in the order of serving cell indices. It is
here assumed that when the CQIIPMI of a serving cell whose serving cell index is "n" is:
[0065]
[Formula 11
15 or), o,'"), ("1 (")
0 2 ,...,oO,,- I
and when the serving cell indices of serving cells in the active state in the order of smaller
values is:
[00661
[Formula 21
20 {a0,a1,a,.2.. , a+,}
the connected CQIIPMI sequence ox is represented as shown below.
100671
[Formula 31
2 5 Here,
[0068]
[For~nula4 1
oc>, ,o, <,,o , n>2.. .,o n\*-,
represents the CQIIPMI sequence length of each serving cell, and 0 represents the
30 sequence length of connected CQIIPMI.
[0069]
In Step S603, a determination unit (not shown) next determines whether the sequence
length of collnccted CQIIPMI sequence o, is 12 bits or more. 'This deterillillation result is
reported to each block in mobile station 400. This determination may be carried out by
scrambling unit 205 or CRC generation unit 209.
[0070]
If the sequence length is less than 12 bits, in Step S615, scrambling unit 205 simply
5 supplies the connected CQIIPMI sequence ox witllout alteration and coding unit 401 carries out
block-encoding of the connected CQIIPMI sequence ox. On the other hand, if the sequence
length is 12 bits or more, the following process is cax-sied out.
[007 11
In Step S605, CRC generation unit 209 first generates and supplies CRC code of 8 bits for
10 the connected CQIIPMI sequence ox.
[0072]
Next, in Step S607, scrambling code identifier conversion unit 201 converts the serving cell
information to scrambling code identifier c,,, and determines c,,,. A scrambling code identifier is
a parameter for generating scrambling code and is a value having a one-to-one correspondence
15 with serving cell information. As an example, a case is considered in which the state a(n) of a
serving cell for which the serving cell index is n is defined as shown below:
COO731
[Formula 51
1 if Serving Cell n is active
a(n) =
0 otherwise
20 Were, the identifier c,,, of scrambling code can be defined, for example, as sl~ownb elow:
[0074 J
[Formula 61
Here, Ncelrl epresents the total number of serving cells. In this example, the state of each
25 serving cell corresponds to each column of a binary number, and a unique identifier c,,, of
scrambling code is generated. Because a serving cell (PCcll) whose serving cell index is "0" is
always in the active state (a(0)=1), it is excluded from the calculation.
[00751
In Step S609, scrambling code generation unit 203 generates scrambling code c(x) that
30 corresponds to scrambling code identifier c,,,. The scrambling code may also be code in which a
different sequence corresponds to a different scrambling code identifier. However, from the
staildpoint of error-proofing, a code that has a large intercode distance between selectable
scrambling codes is preferable. Examples of sequences having this property include an M
sequence, Gold sequence, Reed-Muller code, and Hadamard code. An example of the ge~leratioil
of scrambling code using an M sequence is presented below as an example.
[0076]
5 [Formula 71
where N is an adjustable parameter that represents the number of shift steps of scrambling
code generation unit 203 and the scrambling code period is 2N-1.
10 [Formula 81
is an adjustable parameter that determines the generating polynomial of an M sequence,
and is selected such that the generating polynomial becomes a primitive polynomial. Here, N,,,
represents the lumber of terms of the generating polynomial. In this example, scrambling code
15 identifier c,,, is set to the initial output of the scrambling code, and a unique sequence is
generated for c,,,.
[0078]
In Step S6 1 1, scrambling unit 205 next uses scrambling code c(x) to carry out scrambling
of the connected CQIIPMI sequence ox and supplies the followiilg CQIIPMI transmission
20 sequence ox1.
[0079]
[Formula 91
o: = (o, + c(x))mod 2
Finally, in Step S613, coding unit 401 adds CRC code to CQIIPMI transmission sequence
25 ox1 and cai-sies out convolutional encoding.
[0080]
The sequence that was encoded in Step S613 or S615 is then transmitted to base station 500
by way of transmission unit 403, radio coi~trolu nit 405 and antenna 407.
[008 11
30 FIG. 7 is a flow,cllart for describing the CQIIPMI decoding procedure in base station 500
of the present exemplary embodiment. In FIG. 7, it is assumed that the sequence that was
encoded in mobile station 400 by the method of FIG. 6 and transmitted is received as a received
sequence in reception unit 501. In addition, in FIG. 7, the same reference numbers are given to
the steps that are the same as in FIG. 6.
[0082]
5 As shown in FIG. 7, in Step S701, serving cell information control unit 305 first saves
serving cell information b(n) within mobile station 400 that is held by base station 500 as
temporary variable ate"lp(n).
[0083]
In Step S603, decoding unit 301 next determines the sequence length ~ ' ~ " ' %thf e
10 connected CQIIPMI sequence based on atemp(na)n d judges whether the sequence length is 12
bits or more. The result of this judgment is reported to each block within base station 500.
[0084]
If the sequence length oterins Ples s than 12 bits, decoding unit 301 carries out a decoding
process of the received sequence that is block code in Step S703, and in Step S711, CQIIPMI
15 separation unit 303 based on ateXnP(nse) parates the CQIIPMI of the serving cells inactive state in
the order of serving cell indices and supplies the CQIIPMI of each serving cell. On the other
hand, if the sequence length ote"lP is equal to or greater than 12 bits, the following process is
cal-ried out.
[0085]
2 0 First, in Step S705, decoding unit 301 carries out a decoding process of the received
sequence that is convolutional code. The decoded CQIIPMI sequence is hereupon supplied to
scran~blingu nit 205.
[0086l
I11 Step S607, scrambling code identifier conversion unit 201 next, based on ate""'(n),
25 determines the scrambling code identifier:
[0087]
[Formula 101
by means of Formula 6.
30 [0088]
In Step S609, scrambli~lgc ode generation unit 203 next generates scra~nblingc ode by
means of Fortllula 7.
[0089]
In Step S611, scran~blingu nit 205 next carries out scranlblillg of the decodcd sequence:
[0090]
[Formula 111
r temp
0,s.
and generates the conllected CQIIPMI sequence candidate:
5 [0091]
[Formula 121
dCmp
[0092]
In Step S707, CRC checking unit 307 next carries out a CRC check of the connected
10 CQIIPMI sequence candidate:
[0093]
[Formula 131
0:elnp
[0094]
15 If the CRC check result is correct, the sequence length of the connected CQIIPMI sequence
is correct (OteInp= 0), and it can be judged that the scrambling code identifier matches with the
value used in mobile station 400:
[0095]
[Formula 141
tc111p - 20 ( Cscr - cscs1
The scrambling code identifier uniquely corresponds with the serving cell information as in
Formula 6, whereby it can be confirmed that the perceptions of the serving cell informati011
coiilcide (atc"'"((n = a(n)) between base station 500 and rnobile station 400. In this case, serving
cell information control unit 305 in Step S709 saves a'e"'P(n) as serving cell information b(n) that
25 is held by the base station, updates b(n), and reports this action to CQIIPMI separation unit 303.
Finally, in Step S711, CQIIPMI separation unit 303, based on b(n) that follows updating,
separates CQIIPMI of each serving cell from the connected CQIIPMI sequence candidate in the
order of the serving cell indices:
[0096]
30 [Formula 151
c""
and supplies as output the CQIIPMI of each serving cell.
[0097]
On the other hand, when the CRC checl< result is ii~corrects, ervi~lgc ell i~lforlnatiollc o~~trol
unit 305 in Step S713 judges whether or not all patterns of the serving cells that have been set in
advance have been tested. If all patter~~hasv e been tested, the CQIIPMI decoding process ends
without obtaining the correct CQIIPMI. If there are still untested patterns, serving cell
infor~nationc ontrol unit 305 alters temporary servil~gc ell information atctnp(na)n d again carries
5 out the processes of Step S701 and succeeding steps. One example that can be offered as a11
alteration of atcn"'(n), one serving cell in the active state in ateInp(ni)s temporarily altered to the
inactive state.
[0098]
In the present exemplary embodiment as described hereinabove, mobile station 400 adds
10 serving cell information to connected CQIIPMI by using a scrambling code that accords with
serving cell information to carry out scrambling.
COO991
As a result, base station 500, by restoring the serving cell information, is able to
comprehend the state of each serving cell that was perceived by mobile station 400, whereby the
15 effect is obtained in which the connected CQIIPMI can be separated correctly for each serving
cell. As a result, CQIIPMI that was discarded as indefinite information in the related
configuration call be newly used, and communication resources can be efficiently utilized.
[Ol 001
In addition, the effect is obtained in which the active state information of each serving cell
20 can be clearly shared between base station 500 and mobile station 400. As a result, the control of
active states and the allocation of communication resources by base station 500 can be carried
out efficiently based on tlie correct states of serving cells.
[OlOl]
Finally, because scrambling is used as the method of adding serving cell information, the
25 effect is obtained that serving cell information can be added without increasing the CQIIPMI
sequence length.
(2) Second Exemplary EmbotZiment
In the first exemplary embodiment, scrambling was used as the method of adding serving
30 cell information, but in the present exemplary embodiment, cyclic shifting is used.
[O 1 021
After the generation of CRC code, mobile station 400 convests tlie serving cell information
to a cyclic shift amount and then carries out cyclic shifting of connected CQIIPMI in accordallce
with the cyclic shift amount.
C01031
Base station 500 carries out reverse cyclic shifting such that the CRC check result is correct
and obtains the serving cell inforination of mobile station 400 from the cyclic shift amount at the
time when the CRC check result became correct.
5 [0104]
FIG. 8 and FIG. 9 are block diagrams showing the configurations of CQIIPMI generation
unit 800 and CQIIPMI decoding unit 900, respectively, of the second exemplary embodiment of
the present invention.
[0 1051
10 CQIIPMI generation unit 800 shown in FIG. 8 is of a configuration in which CQIIPMI
generation unit 200 of the first exemplary embodiment shown in FIG. 2 is modified by replacing
scrambling code identifier conversion unit 201, scrambling code generation unit 203, and
scrambling unit 205 with cyclic shift amount conversion unit 801 and cyclic shift unit 803. In
FIG. 8, adding unit is made up of cyclic shift amount conversion unit 801 and cyclic shift unit
15 803.
[0 1 061
CQIIPMI decoding unit 900 shown in FIG. 9 is of a configuration in which CQIIPMI
decoding unit 300 of the first exemplary embodiment shown in FIG. 3 is ~nodifiedb y replacing
scrambling code identifier conversion unit 20 1, scrambling code generation unit 203, and
20 scran~blingu nit 205 by cyclic shift amount conversion unit 801 and reverse cyclic shift unit 901.
In FIG. 9, the restoration unit is made up of decoding unit 301, cyclic shift amount conversion
unit 801, reverse cyclic shift unit 901, serving cell information control unit 305, and CKC
checking unit 307.
[O 1 071
25 I11 other words, CQI/PMI generation unit 800 and CQIIPMI decoding unit 900 of the
present exemplary embodiment differ from CQI/PMI generation unit 200 and CQIIPMI decoding
unit 300 of the first exemplary embodiment in that the value for converting serving cell
information is changed from the scrambling code identifier to the cyclic shift amount and in that
the scrambling process is replaced by the cyclic shifting process.
30 [0108]
In the present exemplary embodiment, the scrambling code identifier c,,, in the first
exemplary embodiment is thus replaced by the cyclic shift amount c,,.
[0109]
In the present exemplary embodiment, moreover, the conligurations of base station 500 and
mobile station 400 are the same as in the first exemplary embodimeilt (refer to FIG. 4 and FIG.
5).
[OllO]
The operation of the present exemplary embodiment is next described.
5 [Olll]
FIG. 10 is a flow chart for describing the CQIIPMI generation procedure in mobile station
400 of the present exemplary embodiment. In FIG. 10, steps identical to steps in FIG. 6 are given
the same reference numbers.
[0112]
10 As shown in FIG. 10, in Step S 1001, cyclic shift amount conversion unit 801 converts the
serving cell information to the cyclic shift amount c,, and determines c,,, and in Step S 1003,
cyclic shift unit 803, in accordance with the cyclic shift amount c,,, carries out cyclic shifting of
the connected CQIIPMI sequence:
[0113]
15 [Formula 161
as shown below:
[0114]
20 [Formula 171
0: = O(J-c,,)modO
and supplies CQIIPMI transmission sequence 0,'.
FIG. 11 is a flow chart for describing the CQIIPMI restoratioil procedure in base station
500 of the present exemplary embodiment. In FIG. 11, steps that are identical to steps in FIG. 7
25 are given the same reference numbers.
[OI 151
As shown in FIG. 11, reverse cyclic shift unit 901 in Step S 11 01, in accordance with the
cyclic shift amount:
[0116]
30 [Formula 181
e""
carries out reverse cyclic shifting of the decoded CQIIPMI sequence:
[0117]
[Formula 191
07,o ;'~',.~ ..~ , 0'('r ] t ,e,l,n, ,p, -,
as shown below to supply as output the connected CQIIPMI sequence candidate:
[0118]
[Formula 201
5 0 . y = o[,;.:;;;,,,*) * (),c,l,p
[0119]
In this case as well, the conditio~bl y which the CRC check result of:
[O 1201
[Formula 2 1 ]
10 c""'
is correct is limited to o ~=~ 0', a~nd' m~or eover:
[0121]
[Formula 221
c y = Ccs
15 and as in the first exemplary embodiment, serving cell information a(n) of mobile station
400 can be restored based on:
[O 1221
[Formula 231
temp
ccs
20 [0123]
The effect of the present exemplary embodiment is similar to that of the first exemplary
embodiment.
(3) Tlzircl Exevzzylnry E~zboclinzeizt
25 FIG. 12 is a bloclc diagram showing the configuration of base station 1200 of the third
exemplary embodiment of the present invention.
[0124]
In the present exemplary embodime~lt,b ase station 1200 represents more specifically a
configuration that, based 011 servi~lgc ell information, carries out active state control of mobile
30 station 400.
[O 1251
Base station 1200 shown in FIG. 12 is of a configuration in which control unit 1201,
tra~lsmissionu nit 1203, radio control unit 1205, and antenna 1207 are added to base station 500
of the first and second exeinplary embodiments shown in FIG. 5.
[0 1 261
Control unit 120 1 determines based on the serving cell information that was received as
input from CQIIPMI decoding unit 300 whether to activate or deactivate mobile statioi~4 00 and
5 supplies the determination result to transmission unit 1203.
[0 1271
Based on the determination result that was received from control unit 1201, transmission
unit 1203 transmits active state control information that instructs activation or deactivation to
mobile station 400. For example, the active state control information may be transmitted using a
10 MAC Control Element or may be transmitted using a Layer3 message.
[0 1281
In the present exemplary embodiment as described hereinabove, the effect is obtained in
which base station 1200, based on the correct serving cell states, is able to efficiently carry out
active state control of mobile station 400.
15 [0129]
The other effects of the present exemplary embodiment are similar to those of the first
exemplary embodiment.
[0130]
Although the present invention has been described with reference to exemplary
20 embodiments, the present invention is not limited to the above-described exemplary
embodiments. The configuration and details of the present invention are ope11 to various
modifications within the scope of the present invention that will be clear to one of ordinary skill
in tlie art.
[0131]
2 5 For example, in the above-described exemplary embodiments, serving cell information was
added to a connected CQIIPMI sequence by implementing scrambling or cyclic shifting, but the
present invention is not limited to these forms, and the serving cell information may also be
connected to the beginning or end of a CQI/PMI sequence as independent information bits.
[0132]
3 0 Although a connected CQIIPMI sequence was subjected to scrambling or cyclic shifting in
tlie above-described exemplary embodiments, the present invention is not limited to these forms,
and these processes may be carried out upon CKC instead of upon a coiiilected CQIIPMI
In addition, although serving cell informatioll was added to CQIIPMI in the abovedescribed
exenlplary embodiments, the present invention is not limited to this form, and serving
cell information may be added to other transmission data to which CRC code is added such as
PUSCH (Physical Uplink Shared Channel), transport blocks, PDSCH (Physical Downlink
5 Shared Channel), and PDCCH transmission data. In this case, either a base station or a mobile
station may be the transmission device or the reception device. In this case, indefiniteness of all
of the transmission data of a plurality of connected serving cells call be clearly resolved.
[0 1341
This application claims the benefits of priority based on Japanese Patent Application No.
10 201 2-1485 13 for which application was submitted on July 2,2012 and incorporates by citation
all of the disclosures of that application.

We claim:-
1. A transmission device comprising:
a coilnecting unit that connects transmission data of each a plurality of serving cells;
an adding unit that adds active state information that indicates whether the state of each of
said plurality of serving cells is the active state to said transmission data that were connected to
generate a transmission sequence; and
a transmission unit that transmits said transmission sequence that was generated.
10 2. The transmission device as set forth in claim 1, wherein said adding unit comprises:
a conversion unit that converts active state information of each of said plurality of serving
cells to a scrambli~~cogd e identifier;
a scrambling code generation unit that generates scrambling code in accordance with said
scrambling code identifier that was converted; and
15 a scrambling unit that uses said scrambling code that was generated to carry out scrambling
of said transmission data that were connected.
3. The transmission device as set forth in claim 1, wherein said adding unit comprises:
a conversion unit tliat converts active state information of each of said plurality of serving
20 cells to a cyclic shift amount; and
a cyclic shift unit that carries out cyclic shifting of said transmission data that were
connected ill accordance with said cyclic shift amount tliat was converted.
4. A reception device comprising:
25 a reception unit that receives from a transmission device a transmission sequence in which
tra~lsmissiond ata of each of a plurality of serving cells are connected and active state
information that indicates whether the state of each of said plurality of serving cells is the active
state is added to said transmissioll data that were connected;
a restoration unit tliat restores the active state information of each of said plurality of
30 serving cells based on said traiisinission sequelice that was received; and
a separation unit that, based on active state information of each of said plurality of serving
cells that were restored, separates transmission data of each of said plurality of serving cells from
said traiisnlission data that were connected.
5. The reception device as set forth in claim 4, wherein:
said transmission sequence is realized by scrambling of said trallsinission data that were
connected, by using a scrambling code that accords with a scrambling code identifier obtained by
converting active state information of each of said plurality of serving cells, and moreover, said
5 transinission sequence is realized by adding CRC code to said transmission data that were
connected;
said restoration unit includes:
a conversion unit that convei-ts candidates of active state information of each of said
plurality of serving cells to scrambling code identifiers;
10 a scrambling code generation unit that generates scrambling code in accordance with said
scrambling code identifiers that were converted;
a scrambling unit that generates, for said transmission sequence, candidates of said
transmission data that were connected by carrying out scrambling using said scrambling code
that was generated;
15 a CRC checking unit that carries out CRC checking of candidates of said transmission data
that were connected; and
an information control unit that successively changes candidates of active state information
of each of said plurality of serving cells such that said CRC checking results become correct and
that takes the candidate of active state information of' each of said plurality of serving cells when
20 said CRC checking result is correct as the active state information of each of said plurality of
serving cells that were restored; and
said separation unit, based on said active state informatioil of each of said plurality of
serving cells that were restored, separates transmission data of each of said plurality of serving
cells from the candidate of connected transmission data at the time said CRC checking result is
25 correct.
6. The reception device as set forth in claim 4, wherein:
said transmission sequence is realized by carrying out cyclic shifting of said transmission
data that were connected in accordance with a cyclic shift amount obtained by convertiilg active
30 state information of each of said plurality of serving cells, and moreover, said trallslnission
sequence is realized by adding CRC code to said trallslnission data that were conrlected;
said restoratioll unit includes:
a conversion unit that converts candidates of active state inforn~ationo f each of said
plurality of serving cells to cyclic shift aamounts;
a reverse cyclic shift unit that, by carrying out reverse cyclic shifting of said translnission
sequence in accordance wit11 said cyclic shift amounts that were convel-ted, generates candidates
of said transmission data that were connected;
a CRC checking unit that carries out CRC checking of candidates of said transmission data
5 that were connected; and
an information control unit that sequentially changes candidates of active state information
of each of said plurality of serving cells such that said CRC checking results become correct and
that takes the candidate of active state information of each of said plurality of serving cells when
said CRC checking result is correct as the active state information of each of said plurality of
10 serving cells that were restored; and
said separation unit, based on said active state information of each of said plurality of
serving cells that were restored, separates transmission data of each of said plurality of serving
cells from the candidate of connected transmission data at the time said CRC checking result was
correct.
7. The reception device as set forth in any one of claims 4 to 6, further comprising:
a control unit that, based on active state information of each of said plurality of serving
cells that were restored, determines whether said transmission device is to be activated or
deactivated; and
2 0 a transmission unit that, based on said determination result, transmits active state control
information that instructs activation or deactivation of said transmission device.
8. A transmission method realized by a trallslnission device and comprising:
connecting transmission data of each of a plurality of serving cells;
2 5 adding active state information that indicates whether the state of each of said plurality of
serving cells is the active state to said transmission data that were connected to generate a
transmission sequence; and
transmitting said transmission sequence that was generated.
9. A reception method realized by a reception device and comprising:
receiving from a transmission device a transmission sequence realized by connecting
transmission data, of each of a plurality of serving cells, and adding active state information that
indicates whether the state ol'each of said plurality of serving cells is the active state, to said
trallsmission data that were connected;
based on said translnission sequence that was received, restoring active state informati011 of
each of said plurality of serving cells; and
based on active state informati011 of each of said plurality of serving cells that were
restored, separating transmissio~id ata of each of said plurality of serving cells fro111 the
5 transmission data that were connected.