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4 Description
Title of Invention
I RADIO COMMUNICATION DEVICE, BASE STATION, METHOD FOR RADIO
1 5 COMMUNICATION, PROGRAM, AND RADIO COMMUNICATION SYSTEM
I
•{ I
} Technical Field
1 [0001]
-i
'I The invention relates to a radio communication device, a base station, a
i
i 10 method for radio communication, a program and a radio communication system.
|
"i 1
] Background Art
j [0002]
\ Currently, standardization of a 4G radio communication system is under
j 15 progress by 3GPP (Third Generation Partnership Project). According to the 4G, an
\ improvement in maximum communication speed and a quality improvement in cell
| edges can be realized by using technologies such as relays and carrier aggregation.
5 Further, considerations are given to improving coverage by introducing base stations
x
other than eNodeB (macro-cell base station), such as NeNB (Home eNodeB,
20 femtocell base station, compact base station for cell phones) and RRH (Remote
Radio Head).
[0003]
| (Paging)
Further, in the LTE, an RRCConnected mode and an RRCIdle mode are
, 25 defined. The RRCConnected mode is a state in which a connection is established
| between the UE and the eNodeB, and the UE is capable of sending an uplink signal
and receiving a downlink signal. On the other hand, the RRCIdle mode is a state
in which power of the UE is saved, and the UE in the RRCIdle mode monitors the
paging channel from the eNodeB, and transitions to the RRCConnected mode when
30 being called in the paging channel.
[0004]
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; Here, for example, if the UE is called, since the eNodeB sends the paging
channel at a timing that arrives in a cycle called a paging cycle, the UE of the
RRCIdle mode monitors the paging channel at the paging cycle. Although power
I consumption of the UE can be reduced when the paging cycle is long, there is a
J 5 tendency that a delay from when the UE is called to when it responds becomes large.
Notably, an intermittent receiving cycle that is similar to this is disclosed for example
| in Patent Literature 1.
{ [0005]
| (MTC)
10 On the other hand, debates on MTC (Machine Type Communications) are
I also in progress in the 3 GPP. The MTC is generally synonymous to M2M
1 (Machine to Machine), and refers to a communication between machines and not
\ directly used by a human. The MTC primarily is performed between a server and a
\ MTC terminal that is not directly used by a human.
1 15 [0006]
1 For example, as a medical application of the MTC, a case may be assumed
j in which an MTC terminal collects electrocardiogram information of a human, and
j transmits the electrocardiogram information to a server by using uplink when a
| certain trigger condition is met. As another application of the MTC, a case may be
| 20 assumed in which a vending machine is caused to function as an MTC terminal, and
i a server causes the vending machine under management to report sales once every
| certain cycle (for example, every 30 days).
[0007]
Such an MTC terminal by way of example has the following features in
I 25 general, however, not every MTC terminal needs to have all of the following features,
i and which of the features is to be endowed depends on applications.
Scarce needs to move (Low Mobility)
•1 - Transmission of small data (Online Small Data Transmission)
j - Very low power consumption (Extra Low Power Consumption)
• 30 - Handled by grouping respective MTCs (Group-based MTC Features)
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! Citation List
Patent Literature
[0008]
Patent Literature 1: JPH09-83427A
5
Summary of Invention
Technical Problem
[0009]
However, as with the UE in the RRCIdle mode, the paging cycle of a radio
10 communication device that is not connected to a base station was in an equal interval.
; Due to this, there has been a problem that a degree of freedom of the paging cycle to
; be applied to a radio communication device is low.
j [0010]
] Thus, the invention has been made in view of the above problem, and what
1 15 is aimed by the invention is to provide novel and improved radio communication
i
| device, base station, method for radio communication, program and radio
1
j communication system that can flexibly switch the cycle for a communication of the
j paging channel.
1
1
1
j
J 20 Solution to Problem
| [0011]
'1
| According to an embodiment of the present disclosure, there is provided a
I
j base station including a radio communication section that communicates by radio
I with a radio communication device, and a paging control section that causes the
| 25 radio communication section to send a paging channel for the radio communication
'* device in accordance with a first cycle. The paging channel includes information
indicating a second cycle, and the paging control section changes a cycle for sending
the paging channel from the first cycle to the second cycle.
[0012]
30 In a case where no response is made from the radio communication device
responsive to a paging channel sent in accordance with the second cycle, the paging
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control section may return the cycle for sending the paging channel from the second
cycle to the first cycle.
[0013]
According to another embodiment of the present disclosure, there is
5 provided a radio communication device including a radio communication section that
receives a paging channel from a base station in accordance with a first cycle, and a
receipt control section that changes a receiving cycle for receiving the paging
channel from the first cycle to a second cycle indicated by the paging channel
received by the radio communication section.
10 [0014]
According to another embodiment of the present disclosure, there is
provided a radio communication device including a radio communication section that
communicates by radio with a base station that changes a cycle for sending a paging
I channel to a second cycle in a case where no response is made from the radio
| 15 communication device responsive to the paging channel sent in accordance with a
| first cycle, a detecting section that detects a state change of the radio communication
I device, and a receipt control section that switches a receiving cycle for receiving the
I
[ paging channel from the first cycle to the second cycle according to a detection result
{ obtained by the detecting section.
| 20 [0015]
i The radio communication section may receive a notification indicating the
f first cycle and the second cycle from the base station, and the radio communication
device may further include a storage section that stores the first cycle and the second
| cycle received by the radio communication section.
•j 25 [0016]
3 The receipt control section may switch the receiving cycle between the first
cycle and the second cycle in an unconnected state with the base station.
[0017]
The detecting section may detect a movement of the radio communication
30 device as the state change.
[0018]
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The detecting section may detect that the radio communication device has
moved to a predetermined location as the state change.
[0019]
The detecting section may detect a reduction in a remaining power of the
5 radio communication device as the state change.
[0020]
The radio communication device may have a vending machine function of
selling a product, and the detecting section may detect a change in sales by the
vending machine function or a reduction in a stock of the product as the state change.
10 [0021]
A destination of the paging channel may be designated by using
. identification information allotted to the radio communication device, and the
j identification information used in designating the destination may differ in a paging
| channel sent in accordance with the first cycle and a paging channel sent in
I 15 accordance with the second cycle.
j [0022]
j
| According to another embodiment of the present disclosure, there is
| provided a method for radio communication, the method including detecting a state
, change in the radio communication device, and switching a receiving cycle for
20 receiving a paging channel from a base station from a first cycle to a second cycle,
i the base station being configured to change a cycle for sending the paging channel to
> a second time in a case where no response is made from the radio communication
device responsive to the paging channel sent in accordance with the first cycle
according to a detection result of the state change.
? 25 [0023]
I
1 According to another embodiment of the present disclosure, there is
-•I
^ provided a program for causing a computer to function as a radio communication
device that includes a radio communication section that communicates by radio with
a base station that changes a cycle for sending a paging channel to a second cycle in
30 a case where no response is made from the radio communication device responsive
to the paging channel sent in accordance with a first cycle, a detecting section that
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detects a state change of the radio communication device, and a receipt control
section that switches a receiving cycle for receiving the paging channel from the first
cycle to the second cycle according to a detection result obtained by the detecting
section.
5 [0024]
According to another embodiment of the present disclosure, there is
provided a base station including a radio communication section that communicates
by radio with a radio communication device, and a paging control section that
changes a cycle for sending a paging channel to a second cycle in a case where no
10 response is made from the radio communication device responsive to the paging
channel sent in accordance with a first cycle.
j [0025]
| According to another embodiment of the present disclosure, there is
i
I provided a radio communication system including a radio communication device,
I
1 15 and a base station that changes a cycle for sending a paging channel to a second
I
{ cycle in a case where no response is made from the radio communication device
I
responsive to the paging channel sent in accordance with a first cycle. The radio
communication device includes a detecting section that detects a state change of the
radio communication device, and a receipt control section that switches a receiving
. . .
20 cycle for receiving the paging channel from the first cycle to the second cycle
according to a detection result obtained by the detecting section.
Advantageous Effects of Invention
•j [0026]
25 As described above, according to the invention, a cycle for a communication
of a paging channel can flexibly be switched.
Brief Description of Drawings
[0027]
30 [Fig. 1] FIG. 1 is an explanatory diagram showing an example of a configuration of a
radio communication system.
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[Fig. 2] FIG. 2 is an explanatory diagram showing a 4G frame format.
[Fig. 3] FIG. 3 is an explanatory diagram showing generation of a CCE.
[Fig. 4] FIG. 4 is an explanatory diagram showing blind decoding.
[Fig. 5] FIG. 5 is a functional block diagram showing a configuration of a base
5 station of a first embodiment of the invention.
[Fig. 6] FIG. 6 is an explanatory diagram showing a specific example of paging by
the base station of the first embodiment of the invention.
[Fig. 7] FIG. 7 is a functional block diagram showing a configuration of an MTC
terminal of the first embodiment of the invention.
* 10 [Fig. 8] FIG. 8 is a sequence diagram showing an operation of the first embodiment
t of the invention.
I [Fig. 9] FIG. 9 is a functional block diagram showing a configuration of a base
1 station of a second embodiment of the invention.
1
I [Fig. 10] FIG. 10 is an explanatory diagram showing a specific example of paging by
i
] 15 the base station of the second embodiment of the invention.
| [Fig. 11] FIG 11 is a functional block diagram showing a configuration of an MTC
| terminal of the second embodiment of the invention.
I
| [Fig. 12] FIG. 12 is a sequence diagram showing an operation of the second
| embodiment of the invention.
20 [Fig. 13] FIG. 13 is a functional block diagram showing a configuration of a base
J station of a third embodiment of the invention.
j [Fig. 14] FIG. 14 is an explanatory diagram showing a first notification method of a
» paging cycle.
i [Fig. 15] FIG 15is an explanatory diagram showing a second notification method of
I 25 the paging cycle.
[Fig. 16] FIG. 16 is a functional block diagram showing a configuration of an MTC
terminal of the third embodiment of the invention.
[Fig. 17] FIG. 17 is a sequence diagram showing an operation of the third
embodiment of the invention.
30 [Fig. 18] FIG. 18 is a sequence diagram showing an operation of the third
embodiment of the invention.
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[Fig. 19] FIG. 19 is a functional block diagram showing a configuration of a base
station of a fourth embodiment of the invention.
[Fig. 20] FIG. 20 is an explanatory diagram showing a specific example of paging by
the base station of the fourth embodiment of the invention.
5 [Fig. 21] FIG. 21 is a functional block diagram showing a configuration of an MTC
terminal of the fourth embodiment of the invention.
[Fig. 22] FIG. 22 is an explanatory diagram showing a switch of a receiving cycle by
the MTC terminal of the fourth embodiment of the invention.
[Fig. 23] FIG. 23 is a sequence diagram showing an operation of the fourth
10 embodiment of the invention.
[Fig. 24] FIG. 24 is a functional block diagram showing a configuration of a base
station of a fifth embodiment of the invention.
[Fig. 25] FIG. 25 is an explanatory diagram showing a switch of a paging cycle by
i
f
I the base station of the fifth embodiment of the invention.
j 15 [Fig. 26] FIG 26 is an explanatory diagram showing a switch of the paging cycle by
j the base station of the fifth embodiment of the invention.
1 [Fig. 27] FIG. 27 is a sequence diagram showing an operation of the fifth
I
| embodiment of the invention.
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•j 20 Description of Embodiment
J [0028]
j
.] Hereinafter, preferred embodiments of the present invention will be
described in detail with reference to the appended drawings. Note that, in this
j
| specification and the drawings, elements that have substantially the same function
^ 25 and structure are denoted with the same reference signs, and repeated explanation is
omitted.
[0029]
Further, in the description and the drawings, there may also be cases in
which a plurality of constituent features having substantially the same functional
30 configuration is distinguished by adding different alphabets after the same reference
sign. For example, the plurality of constituent features having substantially the
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same functional configuration may be distinguished as MTC terminals 20A, 20B,
and 20C. However, in cases where the respective one of the plurality of constituent
features having substantially the same functional configuration does not need to be
particularly distinguished, only the same reference sign will be given. For example,
5 when the MTC terminals 20A, 20B, and 20C do not particularly need to be
distinguished, each will simply be termed a MTC terminal 20.
[0030]
Further, the "description of embodiments" will be described in accordance
with the order in the below appendix.
I 10 1. Overview of Radio Communication System
j 1 -1. Overview of radio communication system
j
1 1-2. Configuration of frame
I
j 1-3. Paging
j 1-4. Detailed description of paging channel
j
15 1-5. Blind decoding
1-6. Paging expected in MTC
2. Description of Respective Embodiments
2-1. First embodiment
(Configuration of base station of the first embodiment)
20 (Configuration of MTC terminal of the first embodiment)
I (Operation of the first embodiment)
i
| 2-2. Second embodiment
1 (Configuration of base station of the second embodiment)
; (Configuration of MTC terminal of the second embodiment)
25 (Operation of the second embodiment)
2-3. Third embodiment
; (Configuration of base station of the third embodiment)
[ (Configuration of MTC terminal of the third embodiment)
(Operation of the third embodiment)
30 2-4. Fourth embodiment
(Configuration of base station of the fourth embodiment)
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1 (Configuration of MTC terminal of the fourth embodiment)
(Operation of the fourth embodiment)
2-5. Fifth embodiment
(Configuration of base station of the fifth embodiment)
5 (Operation of the fifth embodiment)
3. Conclusion
[0031]
« 1 . Overview of Radio Communication System»
Currently, standardization of a 4G radio communication system is in
10 progress in 3 GPP. Embodiments of the invention can be adapted to the 4G radio
communication system by way of examples, so an overview of the 4G radio
communication system will be described.
1 [0032]
!
| < 1 -1. Configuration of radio communication system>
| 15 FIG. 1 is an explanatory diagram showing an example of a configuration of
j a radio communication system 1. As shown in FIG. 1, the radio communication
I system 1 includes a base station 10, a core network including an MME (Mobility
1I
| Management Entity) 12, an S-GW (Serving Gateway) 14, and a PDN (Packet Data
li
j Network)-GW 16, MTC terminals 20, and an MTC server 30.
20 [0033]
Embodiments of the invention can be adapted to radio communication
devices such as the base station 10 and the MTC terminals 20 shown in FIG 1.
j Notably, the base station 10 may for example be an eNodeB, a relay node, or a Home
I
I eNodeB that is a compact base station for home use. Further, the MTC terminals 20
i 25 are examples of user equipment (UE), and adaptations to non-MTC terminals such as
, a cell phone, PC (Personal Computer), and the like is also possible as embodiments
• of the invention.
, [0034]
The base station 10 is a radio base station that communicates with the MTC
30 terminals 20. Although only one base station 10 is shown in FIG. 1, a large number
of base stations 10 are connected to the core network in reality. Further, although
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depiction in FIG 1 is omitted, the base station 10 communicates also with other user
I equipments such as a non-MTC terminal.
[0035]
The MME 12 is a device that performs controls of settings, opening, and
5 hand-over of a data communication session. The MME 12 is connected to the base
I station 10 via an interface called X2.
I [0036]
I The S-GW 14 is a device that performs routing and transfer of user data.
f The PDN-GW 16 functions as a connecting node with an IP service network, and
S 10 transfers the user data to and from the IP service network.
1 [0037]
I The MTC terminals 20 are radio terminals specialized for MTC, which is a
I
1 communication between machines and is not used directly by a human, which is
i
i under discussion in the 3 GPP. The MTC terminals 20 perform radio
|
I 15 communication in accordance with an application with the base station 10. Further,
I the MTC terminals 20 perform bidirectional communication with the MTC server 30
I via the core network.
| [°038]
| For example, as a medical application of the MTC, a case may be assumed
| 20 in which an MTC terminal 20 collects electrocardiogram information of a human,
and transmits the electrocardiogram information to the server by using uplink when a
certain trigger condition is met. As another application of the MTC, a case may be
J assumed in which a vending machine is caused to function as the MTC terminal 20,
\ and the MTC server 30 causes the vending machine under management to report
I 25 sales once every certain cycle (for example, every 30 days).
1 [0039]
Such an MTC terminal 20 by way of example has the following features in
general, however, not every MTC terminal 20 needs to have all of the following
features, and which of the features is to be assigned depends on applications.
30 - Scarce needs to move (Low Mobility)
Transmission of small data (Online Small Data Transmission)
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Very low power consumption (Extra Low Power Consumption)
Handled by grouping respective MTCs (Group-based MTC Features)
[0040]

5 Although details of the aforementioned base station 10 and MTC terminals
20 are not decided, they are expected to perform radio communication conforming to
communication between the eNodeB and the UE. Thus, hereinbelow, a radio frame
shared between the eNodeB and the UE will be described. Contents to be described
I hereinbelow can be applied to the communication between the base station 10 and
| 10 the MTC terminals 20.
j [0041]
I FIG. 2 is an explanatory diagram showing a 4G frame format. As shown in
I FIG. 2, a 10ms radio frame is configured often 1ms sub frames #0 to #9. Further,
j
j each 1ms sub frame is configured of two 0.5 ms slots. Further, each 0.5 ms slot is
I 15 configured of seven Ofdm symbols.
| [0042]
} Notably, the Ofdm symbol is a unit used in a communication scheme of an
j OFDM (Orthogonal Frequency Division Multiplexing) modulation system, and is a
j unit by which data processed in one FFT (Fast Fourier Transform) is outputted.
j 20 [0043]
I At a head of each 1ms sub frame shown in FIG 2, a control signal called a
j
1 PDCCH (Phy Downlink Control Channel) is added. One Ofdm symbol to three
J
I Ofdm symbols at the head of the sub frame are used for a transmission of the
i
PDCCH. That is, there are cases in which one Ofdm symbol is used for the
25 PDCCH transmission, and there also are cases in which three Ofdm symbols are used
for the PDCCH transmission.
[0044]
Notably, a region in the radio frame used for the PDCCH transmission is
called a control region, and a region in the radio frame used for transmissions of a
30 PDSCH (Phy Downlink Shared Channel) or a PUSCH (Phy Uplink Shared Channel)
is called a data region.
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[0045]

In the LTE, an RRCConnected mode and an RRCIdle mode are defined.
The RRCConnected mode is a state in which a connection is established between
5 the UE and the eNodeB, and the UE is capable of sending an uplink signal and
receiving a downlink signal. On the other hand, the RRCIdle mode is a state in
which power of the UE is saved, and the UE in the RRCIdle mode monitors the
paging channel from the eNodeB, and transitions to the RRCConnected mode when
being called in the paging channel. In the RRC_Idle mode, information of the UE
10 does not exist in the eNodeB, and in which of tracking areas (paging areas) the UE
exists is registered in an MME connected to the eNodeB by a wired connection
j called an SI-MME interface.
I [0046]
] The tracking areas are several tens to hundred eNodeBs that are in proximity,
] ' 15 and the MME calls the UE by paging channel (incoming call) from all of the
!
\ eNodeBs existing in the tracking area of the UE when a call is made to the UE.
] [0047]
j _
I Due to this, the UE of the RRCIdle mode monitors the paging channel by
| performing a receiving process at a cycle by which the paging channel may be sent,
j 20 and transition to the RRCConnected mode when the call by the paging channel is
| made.
[0048]
Notably, the UE of the RRCIdle mode stops clocks and power to a part of
hardware so as to save power other than when it is in the receiving process for
25 receiving the paging channels. Further, the UE of the RRCIdle mode restarts
power supply to the hardware before the time when the paging channels may be sent
from the eNodeBs, performs the receiving process of the paging channels, and then
again enters the state of saving power after the receiving process.
[0049]
30
In the above described PDCCH, a minimum unit of control information for
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j each UE is called a CCE (Control Channel Element). In the case of sending the
I paging channel to the UE in the PDCCH, the eNodeB sends the CCE including a PI
1 (Paging Indicator) indicating which of resources in the PDSCH the UE should use to
I
I receive the paging channel in accordance with the PDSCH according to a
[ 5 predetermined cycle. That is, the CCE includes the receipt permission (grants) that
I is scheduling information.
I [0050]
I
| In the case where the PI is included in the CCE designated to the UE itself,
I
S the UE can acquire information notifying a presence of a downlink signal addressed
I
1 10 to the UE itself by receiving the paging channel sent on the PDSCH indicated by the
jj PI. Notably, a determination of whether the CCE is designated to the UE itself or
I
{ not is performed by blind decoding to be described later.
I
j [0051]
j
j Here, the PI is inserted in the PDCCH in accordance with the predetermined
j 15 cycle when a paging channel for the UE is present (LTE The UMTS Long Term
1
j Evolution, Edited by: Stefania Sesia, Issam Toufik, Matthew Baker, 3.4 Paging, p.77).
This predetermined cycle is called a DRX (Discontinues reception) cycle, or a paging
1 cycle, and is set for each UE. Such a paging cycle is set by a higher layer signaling
j such as signaling between the UE and the MME on a NAS (Non-Access Stratum)
j 20 protocol. Although power consumption of the UE can be reduced when the paging
I
j cycle is long, there is a tendency that a delay from when the UE is called to when it
1 responds becomes large.
• [0052]
'.
25 A P-RNTI for receiving a C-RNTI (Cell Radio Network Temporary
Identify) that is an identifier of each UE and the paging channel is allotted to each
UE.
; [0053]
As shown in FIG. 3, the eNodeB adds check bits obtained by a CRC (Cyclic
30 Redundancy Check) to the CCE while masking the control information such as the PI
by a P-RNTI, in order to specify the destination of the CCE. Here, the masking
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may be an exclusive OR (XOR) calculation of the control information and the PRNTI,
or may be a serial coupling of the control information and the P-RNTI.
[0054]
When the PDCCH configured of a plurality of CCEs is received, the UE
5 extracts the CCE identified by the UE's own P-RNTI by the blind decoding.
Hereinbelow, a specific description will be given with reference to FIG. 4.
; [0055]
'• FIG. 4 is an explanatory diagram showing the blind decoding. As shown in
I FIG. 4, the UE performs a CRC check while demasking the respective CCEs by its
I 10 own P-RNTI as the blind decoding. That is, the UE performs the CRC check of
~i I
I each CCE on the assumption that each CCE is addressed to the UE itself, and
determines a CCE with a normal result is the CCE designated to the UE itself.
[0056]
By such a blind decoding, the UE determines the CCE designated to the UE
15 itself sent from the eNodeB, and can obtain the PI from the CCE designated to the
UE itself.
[0057]

j As described in "1-1. Configuration of radio communication system", the
20 MTC is required of a super low power consumption. An application by the MTC is
i expected with frequent data collection and settings once a week or once a month.
I For example, an MTC terminal mounted on a vending machine is assumed to report
sales in accordance with a monthly command from a data collecting center (MTC
I server).
; 25 [0058]
I
| Accordingly, in the case of performing a setting to read the data of the MTC
I terminal from the eNodeB once a month, the eNodeB is desired to send a paging (PI
I + paging channel) at different cycles such as thirty days, thirty-one days, twenty-nine
days, and twenty-eight days, depending on a difference of days in each month.
! 30 Accordingly, although a realization of acyclic paging cycles is important, in a current
LTE that is based on paging cycles of an equal interval, it is difficult to comply with
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the acyclic paging cycles.
| [0059] . ;
Notably, there may be a method of performing a long cycled and acyclic
4 paging in an application layer, however, since sending and receiving of the paging
I 5 channel needs to be performed in a specific sub frame with a 1ms width, such a
! highly accurate control in the application layer is difficult.
I [0060]
Further, although it is possible to predeterminedly set to report to the MTC
f terminal at the end of months in the acyclic pattern such as thirty days, thirty-one
i
| 10 days, twenty-nine days, and twenty-eight days, such a predetermined settings has a
i
I defect in that the report is made even in cases where the MTC server does not need
•I
| such a report. Since it is expected that the number of the MTC terminals will be
\ enormous, a congestion may occur within a network if such unnecessary reports are
1 allowed.
j 15 [0061]
j Thus, the embodiments of the invention have been created with the above
j circumstance as a point of concern. According to each of the embodiments of the
invention, the cycle for the communication of the paging channel can flexibly be
switched. Hereinbelow, the respective embodiments of such an invention will be
[ 20 described in detail with reference to the drawings.
[0062]
« 2 . Description of Respective Embodiments»
<2-l. First embodiment
j Firstly, by referring to FIG 5 to FIG 8, the first embodiment of the
I 25 invention will be described. According to the first embodiment of the invention, as
will be described below in detail, paging can be used based on an acyclic pattern.
[0063]
(Configuration of base station of first embodiment)
FIG. 5 is a functional block diagram showing a configuration of a base
30 station 10-1 of the first embodiment of the invention. As shown in FIG. 5, the base
station 10-1 of the first embodiment of the invention includes an antenna 104, a radio
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communication section 108, a scheduler 112, a P-RNTI managing section 116, a
paging cycle managing section 121, a storage section 131, a paging control section
141, and a CRC circuit 150.
[0064]
5 The antenna 104 functions as a sending section that sends a sending signal,
such as a PDCCH (control signal) and a PDSCH (data signal) supplied from the
1 radio communication section 108, as a radio signal, and a receiving section that
|
I supplies a radio signal, which is sent from a radio communication device such as an
f
i MTC terminal 20 of the first embodiment, to the radio communication section 108
I
! 10 by converting the radio signal into an electric receiving signal. Notably, in FIG. 5,
t
f although an example in which the base station 10-1 has one antenna is shown, the
i
j base station 10-1 may include a plurality of antennas. In this case, the base station
| 10 is capable of realizing a MIMO (Multiple Input Multiple Output) communication,
j and a diversity communication and the like.
j 15 [0065]
| The radio communication section 108 performs a sending radio process
j such as modulation, DA conversion, filtering, amplification, up-conversion and the
j like of the sending signal such as PDCCH supplied from the paging control section
j 141 and PDSCH including user data supplied from a S-GW 14. Further, the radio
j 20 communication section 108 performs a receiving radio process such as downit
conversion, filtering, DA conversion, demodulation and the like of the receiving
signal supplied from the antenna 104.
[0066]
The scheduler 112 allots resources for data communication to each of the
25 MTC terminals 20. That is, the scheduler 112 allots a resource block in the PDSCH
that each MTC terminal 20 should receive, and allots a resource block in the PUSCH
that each MTC terminal 20 should send. For example, in a case where a paging
channel to an MTC terminal 20 is present, the scheduler 116 allots a resource in the
PDSCH of a radio frame (10ms radio frames = ten sub frames) according to a paging
30 cycle of the MTC terminal 20 for sending the paging channel to the MTC terminal 20.
[0067]
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The P-RNTI managing section 116 manages the allotment of the P-RNTI to
each MTC terminal 20. Notably, the P-RNTI is used to identify a destination of a
CCE including a PI.
[0068]
5 The paging cycle managing section 121 sets a paging cycle of each MTC
terminal 20 during a non-connected period (during an RRCIdle mode). More
specifically, the paging cycle managing section 121 of the embodiment sets the
paging cycle for sending the paging channel to a MTC terminal 20-1 of the first
embodiment in a combination of two or more different intervals, that is, in an acyclic
10 pattern. For example, the paging cycle managing section 121 normally sets the
I paging cycle at a 10 radio frame cycle, however, it sets the paging cycle in an acyclic
j patternof'3,5,2,9, ...".
| [0069]
{ Notably, since this acyclic pattern is shared with the MTC terminal 20-1, it
] 15 is not realistic to set unlimited numbers of acyclic patterns as the paging cycle. Due
I to this, an iteration of the set acyclic pattern may be treated as the paging cycle.
1 [0070]
i
j
j Further, the paging cycle managing section 121 may set the acyclic pattern
•'% i
I in accordance with an instruction from a network side, such as an MME 12 or an i
•j
| 20 MTC server 30. For example, in a case where a setting at a cycle that comes at an
j
] end of the month such as on 31st, 28th, 31st, and 30th is instructed from the network
• side, the paging cycle managing section 121 may set the acyclic pattern by
j converting the instructed cycles into radio frame units.
[0071]
25 The storage section 131 stores the acyclic pattern of each MTC terminal 20
set by the paging cycle managing section 121.
[0072]
| The paging control section 141 generates the CCE including the PI in a case
where paging information (system information, incoming call and the like) to the
; 30 MTC terminal 20-1 is present. More specifically, the paging control section 141
generates the PI, and the CCE that is obtained by the CRC circuit 150 by masking the
j
SP319790WO00
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PI by the P-RNTI of the MTC terminal 20-1.
| [0073]
Here, the masking may be a calculation of an exclusive OR (XOR) of the PI
, and the P-RNTI, or may be a serial coupling of the PI and the P-RNTI. Due to this,
1 5 the MTC terminal 20-1 to which the P-RNTI used in the masking is allotted can be
designated as the destination of the PI. The CCE generated as above is supplied to
the radio communication section 108, and is mapped in the PDCCH.
I [0074]
i
I Further, the paging control section 141 generates the paging channel
!
I 10 including paging information. The paging channel is supplied to the radio
I
I communication section 108, and is mapped in a resource on the PDSCH indicated by
| the PI. Notably, the paging information such as the incoming call is supplied via an
1 Sl-MME interface from the MME 12 that handles the control information such as
j
] the paging and a handover.
j 15 [0075]
}
j Further, the paging control section 141 of the embodiment controls the
paging (sending of the PI and the paging channel) to the MTC terminal 20-1 in the
RRCIdle mode in radio frames in accordance with the acyclic pattern stored in the
I storage section 131 in connection to the MTC terminal 20-1. Hereinbelow, a more
i
20 detailed description will be given regarding this point with reference to FIG. 6.
'•! [0076]
FIG. 6 is an explanatory diagram showing a specific example of the paging
: by the base station 10-1. In a case where the acyclic pattern stored in the storage
; section 131 in connection to the MTC terminal 20-1 is "3, 5, 2, 9", the paging cycle
25 becomes an iteration of the acyclic pattern as shown in FIG. 6. In the case where
the paging information for the MTC terminal 20-1 is present, the paging control
| section 141 of the base station 10-1 controls the paging in the radio frames that arrive
| in accordance with the acyclic pattern as shown in a square enclosure of "P" in FIG
6.
30 [0077]
As described above, the base station 10-1 of the first embodiment of the
»
i
•j
:|
J
A
j SP319790WO00
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invention can set the acyclic pattern that arrives at the end of months such as 31 st
(January), 28th (February), 31st (March), 30th (April), ..., for example, as the paging
cycle. Due to this, since the base station 10-1 can perform the paging only at the
end of the month when the data report needs to be made from the MTC terminal 20-1,
5 consumption amounts of radio resources and the MTC terminal 20-1 can be lessened
I compared to a case of predeterminedly setting the MTC terminal 20-1 to report data
[ each time at the end of the months.
| [0078]
I
f (Configuration of MTC terminal of the first embodiment)
|
I 10 Next, with reference to FIG. 7, a configuration of the MTC terminal 20-1 of
i
I
f the first embodiment.
!
! [0079]
I
J FIG. 7 is a functional block diagram showing the configuration of the MTC
I
1 terminal 20-1 of the first embodiment. As shown in FIG. 7, the MTC terminal 20-1
I
I 15 of the first embodiment includes an antenna 204, a radio communication section 208,
I
J a receiving cycle control section 221, a storage section 231, a blind decoding section
1 240, and a CRC circuit 250.
•
[0080]
The antenna 204 functions as a sending section that sends a sending signal,
j 20 such as a PUSCH (data signal) supplied from the radio communication section 208,
as a radio signal, and a receiving section that supplies radio signals such as PDCCH
•i and PDSCH, which are sent from the base station 10-1, to the radio communication
i section 208 by converting the radio signals into electric receiving signals. Notably,
] in FIG. 7, although an example in which the MTC terminal 20-1 has one antenna is
25 shown, the MTC terminal 20-1 may include a plurality of antennas. In this case, the
MTC terminal 20-1 is capable of realizing the MIMO (Multiple Input Multiple
Output) communication, and the diversity communication and the like.
[0081]
! The radio communication section 208 performs a sending radio process of
^ 30 modulation, DA conversion, filtering, amplification, up-conversion and the like of
the user data supplied from a higher layer. Further, the radio communication
I
|
I
i
SP319790WO00
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section 208 performs a receiving radio process of down-conversion, filtering, DA
conversion, demodulation and the like of the receiving signals supplied from the
antenna 204.
[0082]
5 The storage section 231 stores various types of information used in the
communication with the base station 10-1. For example, the storage section 231
stores the P-RNTI allotted to the MTC terminal 20-1 by the P-RNTI managing
I section 116 of the base station 10-1, the acyclic pattern set by the paging cycle
{
I managing section 121 of the base station 10-1 and the like.
i
| 10 [0083]
I
| The receiving cycle control section 221 is a receipt control section that
]
{ controls a receiving cycle (DRX cycle) for monitoring the paging in the RRC_Idle
i
j mode. More specifically, the receiving cycle control section 221 causes the blind
l
| decoding section 240 to perform blind decoding in accordance with the radio frames
1
{ 15 complying with the acyclic pattern stored in the storage section 231.
[0084]
The blind decoding section 240 extracts the CCE identified by the P-RNTI
given to the MTC terminal 20-1 by the blind decoding when the PDCCH is supplied
I from the radio communication section 208.
20 [0085]
Yet more specifically, the blind decoding section 240 cooperates with the
j CRC circuit 250 to perform a CRC check by demasking each CCE by the P-RNTI
I given to the MTC terminal 20-1. Then, the blind decoding section 240 extracts the
CCE with a normal result, and supplies the resource on the PDSCH indicated by the
25 PI described in the CCE as a decoded result to the radio communication section 208.
The radio communication section 208 can achieve the paging channel sent from the
base station 10-1 b base station 10-1 by performing the receiving process on the
resource on the PDSCH indicated by the decoded result.
: [0086]
30 As described above, the MTC terminal 20-1 of the first embodiment can
monitor the paging in accordance with the acyclic pattern set by the base station 10-1.
SP319790WO00
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Notably, in the above, an example in which the base station 10-1 sets the acyclic
pattern and notifies the MTC terminal 20-1 is described, however, the MTC terminal
20-1 may set the acyclic pattern and notify the acyclic pattern to the base station 10-1.
[0087]
I 5 (Operation of the first embodiment)
\ In the above, the configurations of the base station 10-1 and the MTC
! terminal 20-1 of the first embodiment of the invention was described. Subsequently,
J by referring to FIG. 8, an operation of the first embodiment of the invention will be
I described.
j 10 [0088]
I FIG 8 is a sequence diagram showing an operation of the first embodiment
i
j of the invention. As shown in FIG. 8, in a state in which the MTC terminal 20-1 is
j operating in the RRCConnected mode (S302), when the base station 10-1 sets the
acyclic pattern (S304), the base station 10-1 notifies the acyclic pattern to the MTC
15 terminal 20-1 (S306).
j [0089]
I The MTC terminal 20-1 returns an ACK to the notification of the acyclic
-i
j pattern to the base station 10-1 (S308), and stores the acyclic pattern in the storage
1 section 231 (S310).
j 20 [0090]
j Thereafter, when the MTC terminal 20-1 transitions to the RRC_Idle mode,
l
! the receiving cycle control section 221 causes the blind decoding section 240 to
monitor the paging (PI) in accordance with the acyclic pattern stored in the storage
section 231 (S312).
25 [0091]
On the other hand, when a paging request is supplied from the MME 12 via
the Sl-MME interface (S314), the base station 10-1 specifies a timing that arrives in
accordance with the acyclic pattern set in S3 04 (S316), and performs paging at the
specified timing (S318). Here, since the MTC terminal 20-1 is monitoring the
30 paging at the acyclic pattern, the paging from the base station 10-1 can be achieved.
[0092]
i
i
SP319790WO00
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I <2-2. Second embodiment
; In the above, the first embodiment of the invention was described. Now,
the second embodiment of the invention will be described. According to the second
embodiment of the invention, as will be described in detail, a paging cycle can be
'• 5 switched among a plurality of cycles at a certain timing.
[0093]
' (Configuration of base station of the second embodiment)
FIG. 9 is a functional block diagram showing a configuration of a base
i station 10-2 of the second embodiment of the invention. As shown in FIG. 9, the
I
j 10 base station 10-2 of the second embodiment of the invention includes an antenna 104,
I
I a radio communication section 108, a scheduler 112, a P-RNTI managing section 116,
)
i . .
| a paging cycle managing section 122, a storage section 132, a paging control section
! 142, and a CRC circuit 150. Functions of the antenna 104, the radio
1
1 communication section 108, the scheduler 112, the P-RNTI managing section 116,
.1
i 15 and the CRC circuit 150 are as described in the first embodiment, so hereinbelow,
configurations that differ from the first embodiment will primarily be described.
[0094]
The paging cycle managing section 122 sets a plurality of cycles for paging
j
J to each MTC terminal 20-2 operating in an RRC_Idle mode, and a switching timing
20 of the plurality of cycles. For example, the paging cycle managing section 122 sets
a long cycle, a short cycle, and the switching timing (time, or frame) of the long
cycle and the short cycle. The cycle switching timing may be a time to switch the
cycle, or a frame number and the like, or a duration time of the long cycle or the
short cycle, or a continued frame number.
25 [0095]
Notably, in a case where the paging cycle managing section 122 sets three
or more cycles, information for determining as to which of the cycles should be
switched to at each cycle switching-timing is necessary. Thus, the paging cycle
managing section 122 may set each cycle switching timing by associating the cycle
30 after the switch. Alternatively, the paging cycle managing section 122 may set a
switching order of each cycle. By such a configuration, use of cycles of three or
i
\!
;]
i SP319790WO00
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more such as the long cycle, an intermediate cycle, the short cycle and the like
becomes possible.
S [0096]
| The storage section 132 stores the plurality of cycles of each MTC terminal
| 5 20 set by the paging cycle managing section 122, and information indicating the
| timing to switch the plurality of cycles.
) [0097]
j The paging control section 142 controls the paging to the MTC terminal 20-
I
t 2 in the RRC_Idle mode in accordance with radio frames according to the plurality
I
J 10 of cycles and the cycle switching timing stored in the storage section 132 in
J
j connection to the MTC terminal 20-2. Hereinbelow, this feature will be described
J
j more specifically with reference to FIG. 10.
I [0098]
1 FIG. 10 is an explanatory diagram showing a specific example of the paging
1 15 by the base station 10-2. In a case where the long cycle, the short cycle, and cycle
] switching-timings tl, t2 are stored in the storage section 132 in connection to the
I3
I MTC terminal 20-2, the paging control section 142 of the base station 10-2 switches
I
1 the paging cycle from the short cycle to the long cycle at tl as shown in FIG. 10.
1 Further, the paging control section 142 switches the paging cycle from the long cycle
j
I 20 to the short cycle at t2.
I [0099]
Then, in a case where paging information to the MTC terminal 20-2 is
present, the paging control section 142 of the base station 10-2 controls the paging by
the radio frames that arrive in accordance with the switching of the long cycle and
25 the short cycle as shown in a square enclosure of "P" in FIG 10.
: [0100]
As described above, by for example arranging the short cycle near the end
of months, the base station 10-2 of the second embodiment of the invention can
perform paging with less delay from an occurrence of a paging request at the end of
, 30 months even if days in each month differ. Further, in the second embodiment of the
invention, the long cycle, the short cycle, and the cycle switching-timing can be
I
•i SP319790WO00
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shared between the base station 10-2 and the MTC terminal 20-2. Due to this,
compared to the first embodiment, an information amount of signaling from the base
station 10-2 to the MTC terminal 20-2 can more easily be controlled.
[0101]
j 5 (Configuration of MTC terminal of the second embodiment)
I
I Next, the configuration of the MTC terminal 20-2 of the second
|
I embodiment will be described with reference to FIG. 11.
I
j [0102]
I
I FIG. 11 is a functional block diagram showing the configuration of the MTC
t
{ 10 terminal 20-2 of the second embodiment. As shown in FIG. 11, the MTC terminal
I
J 20-2 of the second embodiment includes an antenna 204, a radio communication
i |
I section 208, a receiving cycle control section 222, a storage section 232, a blind
{
j decoding section 240, and a CRC circuit 250. Functions of the antenna 204, the
I radio communication section 208, the blind decoding section 240, and the CRC
15 circuit 250 are as described in the first embodiment, so hereinbelow, configurations
differing from the first embodiment will primarily be described.
[0103]
The storage section 232 stores various types of information used in a
? communication with the base station 10-2. For example, the storage section 232
20 stores the P-RNTI allotted to the MTC terminal 20-2 by the P-RNTI managing
j section 116 of the base station 10-2, and the long cycle, the short cycle, the cycle
switching-timing and the like that are set by the paging cycle managing section 121
i of the base station 10-2.
; [0104]
25 The receiving cycle control section 222 is a receipt control section that
; controls a receiving cycle (DRX cycle) for monitoring paging in an RRCIdle mode.
i
| More specifically, the receiving cycle control section 222 causes the blind decoding
j section 240 to perform blind decoding with radio frames in accordance with the long
< cycle, the short cycle, and the cycle switching-timing stored in the storage section
: 30 232.
[0105]
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I As described above, the MTC terminal 20-2 of the second embodiment can
switch the receiving cycle among a plurality of cycles at the cycle switching-timing
| set by the base station 10-2. Notably, although an example in which the base station
} 10-2 sets the cycle switching-timing and notifies the same to the MTC terminal 20-2
| 5 is described above, the MTC terminal 20-2 may set the cycle switching-timing and
t notify the same to the base station 10-2. Further, in the case where the plurality of
J cycles such as the long cycle and the short cycle is shared between the base station
1 10-2 and each MTC terminal 20-2 in advance, the base station 10-2 does not have to
i notify the long cycle and the short cycle.
j 10 [0106]
I (Operation of the second embodiment)
In the above, the configurations of the base station 10-2 and the MTC
terminal 20-2 of the second embodiment of the invention are described. Next, the
operation of the second embodiment of the invention will be described with
15 reference to FIG. 12.
j [0107]
3 FIG. 12 is a sequence diagram showing the operation of the second
embodiment of the invention. As shown in FIG. 12, in a state where the MTC
terminal 20-2 is operating in an RRC_Connected mode (S402), when the base station
20 10-2 sets the cycle switching-timing (S404), the base station 10-2 notifies the cycle
switching-timing to the MTC terminal 20-2 (S406).
[0108]
The MTC terminal 20-2 sends an ACK responsive to the notification of the
cycle switching-timing to the base station 10-2 (S408), and stores the cycle
25 switching-timing in the storage section 232 (S410). Notably, the base station 10-2
may notify the plurality of cycles such as the long cycle and the short cycle, in
addition to the cycle switching-timing.
[0109]
Thereafter, when the MTC terminal 20-2 transitions to the RRCIdle mode,
30 the receiving cycle control section 222 monitors paging in accordance with the long
cycle or the short cycle, and switches the long cycle and the short cycle at the cycle
i
i
'•$
3
>
j
1
SP319790WO00
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<^
* switching-timing stored in the storage section 232 (S412).
[0110]
On the other hand, when the paging request is supplied from an MME 12
I via an SI-MME interface (S414), the base station 10-2 specifies a timing that is to
I 5 arrive in accordance with the long cycle or the short cycle that is switched at the
4
I cycle switching-timing set in S404 (S416), and performs paging at the specified
j timing (S418). Here, since the MTC terminal 20-2 is monitoring paging by
! switching the long cycle and the short cycle at the same cycle switching-timing as
}
f the base station 10-2, the paging from the base station 10-2 can be acquired.
j 10 [0111]
j
{ <2-3. Third embodiment
i
] In the above, the second embodiment of the invention was described. Next,
I
I the third embodiment of the invention will be described. According to the third
j embodiment of the invention, as will be described below, a paging cycle can be
I I 15 sequentially updated.
I
[0112]
(Configuration of base station of the third embodiment)
FIG. 13 is a functional block diagram showing the configuration of a base
I station 10-3 of the third embodiment of the invention. As shown in FIG. 13, the
j. 20 base station 10-3 of the third embodiment of the invention includes an antenna 104, a
I radio communication section 108, a scheduler 112, a P-RNTI managing section 116,
I a paging cycle managing section 123, a storage section 133, a paging control section
] 143, and a CRC circuit 150. Functions of the antenna 104, the radio
I communication section 108, the scheduler 112, the P-RNTI managing section 116,
j 25 and the CRC circuit 150 are as described in the first embodiment, so hereinbelow,
configurations that differ from the first embodiment will primarily be described.
I [0113]
I The paging cycle managing section 123 sequentially updates the paging
i
j cycle for paging an MTC terminal 20-3 operating in an RRC_Idle mode. For
j 30 example, the paging cycle managing section 123 updates the paging cycle to a cycle
B when the paging cycle is of a cycle A.
4
1
I
I
I
\ SP319790WO00
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j [0114]
1
1 The storage section 133 stores the paging cycle (sequentially updated cycle)
J
j sequentially updated by the paging cycle managing section 123.
| [0H5]
j 5 The paging control section 143 controls the paging to the MTC terminal 20-
'i
1
3 in the RRCIdle mode with radio frames in accordance with the sequentially
updated cycle stored in the storage section 133. Here, although the paging cycle
I updated by the paging cycle managing section 123 needs to be notified to the MTC
| terminal 20-3 as well, as a notification method of the paging cycle, a first notification
J
I 10 method described with reference to FIG. 14 and a second notification method
I
| described with reference to FIG 15 may be exemplified.
j [0116]
1
1 FIG. 14 is an explanatory diagram showing the first notification method of
j
I the paging cycle. As the first notification method, the base station 10-3 may notify
j
| 15 the paging cycle as below in all of paging channels. For example, as shown in FIG
| 14, the base station 10-3 may notify the cycle A in a paging channel #11 where the
j cycle A continues to take place thereafter, and may notify the cycle B in a paging
j channel #12 where the paging cycle is to be updated to the cycle B thereafter
I [0117]
; 20 FIG. 15 is an explanatory diagram showing the second notification method
1
j of the paging cycle. As the second notification method, the base station 10-3 may
j notify the updated paging cycle in the paging channel where the paging cycle is to be
I updated thereafter. For example, as shown in FIG 15, the base station 10-3 may not
1
I notify the paging cycle in the paging channel #11 where the cycle A continues to take
I 25 place thereafter, and may notify the cycle B in the paging channel #12 in which the
}
I paging cycle is updated to the cycle B.
| [0118]
•j As described above, according to the third embodiment of the invention, it
i
j is possible to sequentially update the paging cycle related to the MTC terminal 20-3
1 30 operating in the RRC_Idle mode responsive to an update request of the paging cycle
on a network side including the base station 10-3. Further, according to the third
!
1
i
|
1 SP319790WO00
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j embodiment of the invention, since there is no need to share an acyclic pattern
j configured of a plurality of intervals as in the first embodiment, it is advantageous in
I the viewpoint of memory resources. Further, especially the second notification
j method is effective in that it can suppress resources for the notification.
] 5 [0119]
j (Configuration of MTC terminal of the third embodiment)
I Next, the configuration of the MTC terminal 20-3 of the third embodiment
|
will be described with reference to FIG 16.
j [0120]
J
I 10 FIG 16 is a functional block diagram showing the configuration of the MTC
j terminal 20-3 of the third embodiment. As shown in FIG. 16, the MTC terminal 20-
| 3 of the third embodiment includes an antenna 204, a radio communication section
i
I 208, a receiving cycle control section 223, a storage section 233, a blind decoding
j section 240, and a CRC circuit 250. Functions of the antenna 204, the radio
j 15 communication section 208, the blind decoding section 240, and the CRC circuit 250
I are as described in the first embodiment, so hereinbelow, configurations differing
I from the first embodiment will primarily be described.
I [0121]
i
i
| The storage section 233 stores various types of information used in a
j 20 communication with the base station 10-3. For example, the storage section 233
| stores a P-RNTI allotted to the MTC terminal 20-3 by a P-RNTI managing section
1 116 of the base station 10-3, and a paging cycle that is sequentially updated by a
paging cycle managing section 121 of the base station 10-3, and the like.
j [0122]
! ...
I 25 The receiving cycle control section 223 is a receipt control section that
j
j controls a receiving cycle (DRX cycle) for monitoring paging in an RRC Idle mode.
j More specifically, the receiving cycle control section 223 causes the blind decoding
i
section 240 to perform blind decoding with radio frames in accordance with the
j sequentially updated paging cycle stored in the storage section 233.
: 30 [0123]
As described above, the MTC terminal 20-3 of the third embodiment can
I
I
J SP319790WO00
j 30/50
I
| monitor the paging in accordance with the paging cycle that is sequentially updated
j by the base station 10-3.
[0124]
I
(Operation of the third embodiment)
: 5 In the above, the configurations of the base station 10-3 and the MTC
J terminal 20-3 of the third embodiment of the invention were described. Next, the
} operation of the third embodiment of the invention will be described with reference
to FIG. 17.
; [0125]
;' 10 FIG. 17 is a sequence diagram showing an operation of the third
I embodiment of the invention. As shown in FIG 17, in a state where the MTC
i
I terminal 20-3 is operating in an RRCConnected mode (S502), when the base station
i 10-3 sets the paging cycle (S504), the base station 10-3 notifies the paging cycle to
i
j the MTC terminal 20-3 (S506).
! 15 [0126]
i The MTC terminal 20-3 sends an ACK responsive to the notification of the
paging cycle to the base station 10-3 (S508), and stores the paging cycle in the
j storage section 233 (S510).
j [0127]
j 20 Thereafter, when the MTC terminal 20-3 transitions to the RRC Idle mode,
j the receiving cycle control section 223 monitors paging in accordance with the
| paging cycle stored in the storage section 233 (S512).
1 [0128]
1 On the other hand, when the paging request is supplied from an MME 12
25 via an SI-MME interface (S514), the base station 10-3 specifies a timing that is to
arrive in accordance with the paging cycle set in S504 (S516). Further, in the case
of updating the paging cycle, the base station 10-3 writes an updated paging cycle in
I the paging channel (S518). Then, the base station 10-3 performs paging at the
t timing specified in S516 by the paging channel in which the updated paging cycle is
30 written (S520).
[0129]
!
A
s
I
I
j SP319790WO00
\ 31/50
] t
1 When the paging channel in which the updated paging cycle is written is
i
I
j received, the MTC terminal 20-3 stores the updated paging cycle in the storage
I section 233, and monitors the paging in accordance with the updated paging cycle
| (S522).
j 5 [0130]
3 Here, in the embodiment in which the base station 10-3 sequentially updates
j the paging cycle and notifies the same to the MTC terminal 20-3 as described above,
j it is important for the base station 10-3 to know whether the notification of the
j updated paging cycle has been correctly received by the MTC terminal 20-3 or not.
I 10 However, if the MTC terminal 20-3 sends a receipt confirmation by an uplink, there
1 is a problem that signaling is increased.
j [0131]
I Due to this, the base station 10-3 of the embodiment solves the above
j problem by a method described hereinbelow with reference to FIG 18.
j 15 [0132]
| FIG 18 is a sequence diagram showing an operation of the third
j embodiment. As shown in FIG 18, in the case of updating the paging cycle, the
} base station 10-3 performs paging by writing the updated paging cycle in the paging
j channel (S532, S534). Thereafter, the base station 10-3 transitions to the updated
i
\ 20 paging cycle, and in a case where a terminal is called by an incoming call in a first
j
1 paging channel (S536, S538), it determines presence and absence of a response from
i
] the MTC terminal 20-3 to the incoming call (S540).
j [0133]
| Here, if the response was not made from the MTC terminal 20-3, a reason
j
I 25 thereof may be due to the MTC terminal 20-3 not being able to correctly receive the
notification of the updated paging cycle, and the monitoring of the paging is
continued in accordance with the paging cycle before the update. Thus, in the case
where the response to the incoming call was not made from the MTC terminal 20-3,
the base station 10-3 returns the paging cycle to the paging cycle before the update
; 30 (S542). According to such a configuration, the base station 10-3 becomes capable
: of performing the paging at a cycle that is monitored by the MTC terminal 20-3.
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) [0134]
j <2-4. Fourth embodiment
j In the above, the first to third embodiments of the invention were described.
|
j Next, before describing the fourth embodiment of the invention, how the fourth
i
| 5 embodiment of the invention had been made will be described.
j [0135]
I
| In a case where a paging cycle of a UE of an RRC_Idle mode is of a long
| cycle, such as ten days or one month, a state of the UE may change among the cycle
J intervals. However, it had been difficult to change the paging cycle in accordance
J 10 with this change in the state. Although performing signaling for changing the
| paging cycle by the UE transitioning to an RRCConnected mode and performing
! synchronization with an eNodeB may be considered, such a method was problematic
j in that power is consumed therein.
j [0136]
I 15 The fourth embodiment of the invention, and a fifth embodiment to be
} described below are made by focusing on the above matter. An MTC terminal 20-4
| of the fourth embodiment of the invention is capable of changing the paging cycle in
j accordance with the change in the state while maintaining the RRCIdle mode.
| Hereinbelow, such a fourth embodiment of the invention will be described in detail.
j 20 [0137]
I
! (Configuration of base station of the fourth embodiment)
j FIG 19 is a functional block diagram showing a configuration of a base
\ station 10-4 of the fourth embodiment of the invention. As shown in FIG 19, the
base station 10-4 of the fourth embodiment of the invention includes an antenna 104,
! 25 a radio communication section 108, a scheduler 112, a P-RNTI managing section 116,
\ a paging cycle managing section 124, a storage section 134, a paging control section
1 144, and a CRC circuit 150. Functions of the antenna 104, the radio
s
communication section 108, the scheduler 112, the P-RNTI managing section 116,
and the CRC circuit 150 are as described in the first embodiment, so hereinbelow,
30 configurations that differ from the first embodiment will primarily be described.
[0138]
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I The paging cycle managing section 124 sets a plurality of cycles for paging
| to each MTC terminal 20-4 operating in the RRCIdle mode. For example, the
S
\ paging cycle managing section 124 sets a long cycle and a short cycle.
I [0139]
j
: 5 The storage section 134 stores information indicating the plurality of cycles
(the long cycle and the short cycle) of each MTC terminal 20-4 set by the paging
I cycle managing section 124.
j [OHO]
* The paging control section 144 controls the paging to the MTC terminal 20-
; 10 4 in the RRCIdle mode by radio frames in accordance with each of the plurality of
i cycles stored in the storage section 134 in connection to the MTC terminal 20-4.
j Hereinbelow, this respect will be described in detail with reference to FIG. 20.
j [0141]
FIG. 20 is an explanatory diagram showing a specific example of the paging
15 by the base station 10-4. The long cycle and the short cycle are stored in the
j storage section 134 in connection to the MTC terminal 20-4, and a case in which the
j base station 10-4 receives a paging request to the MTC terminal 20-4 from an MME
! 12 at t4 as shown in FIG 20 will be considered. In this case, as shown in FIG 20,
| the paging cycle managing section 124 of the base station 10-4 performs the paging
] 20 to the MTC terminal 20-4 at both a timing in accordance with the short cycle and a
| timing in accordance with the long cycle.
1 [0142]
! (Configuration of MTC terminal of the fourth embodiment)
I Next, a configuration of the MTC terminal 20-4 of the fourth embodiment
f 25 will be described with reference to FIG 21.
[0143]
FIG. 21 is a functional block diagram showing the configuration of the MTC
terminal 20-4 of the fourth embodiment. As shown in FIG. 21, the MTC terminal
20-4 of the fourth embodiment includes an antenna 204, a radio communication
30 section 208, a receiving cycle control section 224, a storage section 234, a blind
decoding section 240, a CRC circuit 250, and a state detecting section 260.
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j ft
I Functions of the antenna 204, the radio communication section 208, the blind
1 decoding section 240, and the CRC circuit 250 are as described in the first
| embodiment, so hereinbelow, configurations differing from the first embodiment will
I
| primarily be described.
j 5 [0144]
• 1
I The storage section 234 stores various types of information used in a
j communication with a base station 10-4. For example, the storage section 234
1
I stores a P-RNTI allotted to the MTC terminal 20-4 by a P-RNTI managing section
116 of the base station 10-4, and a long cycle, a short cycle and the like set by a
10 paging cycle managing section 124 of the base station 10-4.
[0145]
The state detecting section 260 detects a state change of the MTC terminal
i
! 20-4. For example, the state detecting section 260 may be a velocity sensor or a
!
j GPS that detects a movement of the MTC terminal 20-4, or that the MTC terminal
I 15 20-4 has moved to a predetermined position as the state change.
j [0146]
! Further, the state detecting section 260 may detect a decrease in a remaining
] power of the MTC terminal 20-4 (for example, detect that the remaining power has
1
| gone below a threshold) as the state change. Further, in a case where the MTC
I 20 terminal 20-4 is mounted to an apparatus having a function of a vending machine of
j products, the state detecting section 260 may detect change in sales by the vending
i
i machine function or a decrease in product stocks as the state change.
j [0147]
| The receiving cycle control section 224 is a receipt control section that
j 25 controls a receiving cycle (DRX cycle) for monitoring paging in the RRC Idle mode.
Here, if the state of the MTC terminal 20-4 had not at all changed despite data report
(read) order is included in the paging channel from the base station 10-4, there may
be cases in which useful information cannot be obtained from the MTC terminal 20-4.
For example, in a case where the MTC terminal 20-4 is mounted on a vending
30 machine for canned juice, and the base station 10-4 requests a report of stocks from
the MTC terminal 20-4 for the purpose of replenishing the canned juice, a meaning
'1
1
•i f
I i
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I C
!
1
j to have the MTC terminal 20-4 report the stocks is small if the stocks have not
j
j changed at all.
1
j [0148]
j On the other hand, if the state of the MTC terminal 20-4 has changed, it is
J 5 assumed that a value to have the MTC terminal 20-4 report data by paging is
|
I increased. Due to this, in the case where the state of the MTC terminal 20-4 has
i
| changed, it is preferable to make a receiving cycle short. However, normally, since
j a connection is not established when the MTC terminal 20-4 is operating in the
» RRC_Idle mode, it had been difficult to change the receiving cycle by a
| 10 communication with the base station 10-4.
| [0149]
j In regards to this feature, the receiving cycle control section 224 of the
j MTC terminal 20-4 of the embodiment switches the receiving cycle between the long
I cycle and the short cycle depending on a detection of the state change by the state
| 15 detecting section 260. Even if the MTC terminal 20-4 one sidedly changes the
% i
j receiving cycle for paging as above, since the base station 10-4 of the embodiment
performs the paging to the MTC terminal 20-4 at both the timing in accordance with
the short cycle and the timing in accordance with the long cycle as described above
with reference to FIG. 20, the MTC terminal 20-4 can receive the paging from the
20 base station 10-4. Hereinbelow, this feature will be described more specifically
with reference to FIG. 22.
[0150]
I
| FIG 22 is an explanatory diagram showing switching of the receiving cycle
1 by the MTC terminal 20-4. As shown in FIG 22, in a case where the state change is
j
j 25 detected by the state detecting section 260 at t3, the receiving cycle control section
I 224 of the MTC terminal 20-4 switches the receiving cycle from the long cycle to the
I
• short cycle. On the other hand, in a case where the paging request is received from
i the MME 12 at t4, the base station 10-4 performs the paging at both the timing in
accordance with the short cycle and the timing in accordance with the long cycle.
30 Due to this, the MTC terminal 20-4 can receive the paging that is performed at the
timing in accordance with the short cycle from the base station 10-4 after having
I
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j
j switched the receiving cycle.
j [0151]
I Here, a specific example of a criterion of the switch of the receiving cycle
I by the receiving cycle control section 224 will be described. For example, in an
| 5 application for tracking by the MTC terminal 20-4 to monitor a location where a
I cargo is, no new information can be obtained even if the MTC terminal 20-4 is made
i
1 to report the location when no transportation of the cargo is taking place. Thus, the
1 MTC terminal 20-4 monitors in accordance with the long cycle when there is no
transportation of the cargo, and reports the same positional information. On the
10 other hand, when the cargo has moved, the receiving cycle control section 224 of the
MTC terminal 20-4 switches the receiving cycle to the short cycle. Due to this, a
response to a call becomes quicker, and it becomes possible to obtain reports of
useful information such as positional information after the transportation or during
the transportation with a shorter response time. Due to the same reason, the
15 receiving cycle control section 224 of the MTC terminal 20-4 may switch the
receiving cycle to the short cycle when the cargo has moved to a specific location.
j [0152]
j Further, in a case where remaining power of the MTC terminal 20-4 has
I decreased, the receiving cycle control section 224 of the MTC terminal 20-4 may
') 20 switch the receiving cycle from the short cycle to the long cycle. According to such
] a configuration, a decreasing speed of the remaining power of the MTC terminal 20-
I 4 can be suppressed.
[0153]
Further, in a case where sales by the vending machine function is obtained,
25 or in a case where stocks of the products becomes short, the receiving cycle control
; section 224 of the MTC terminal 20-4 may switch the receiving cycle from the long
cycle to the short cycle. According to such a configuration, the network side can
j acquire useful information with less delay.
: [0154]
30 (Operation of the fourth embodiment)
In the above, the configurations of the base station 10-4 and the MTC
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j terminal 20-4 of the fourth embodiment of the invention were described. Next, the
j operation of the fourth embodiment of the invention will be described with reference
j to FIG 23.
j [0155]
5 FIG. 23 is a sequence diagram showing an operation of the fourth
embodiment of the invention. As shown in FIG. 23, in the state in which the MTC
terminal 20-4 is operating in the RRCConnected mode (S602), the base station 10-4
sets the long cycle and the short cycle (S604), and notifies the long cycle and the
j short cycle to the MTC terminal 20-4 (S606).
j 10 [0156]
j
| The MTC terminal 20-4 returns an ACK to the base station 10-4 in response
f
j to the notification of the long cycle and the short cycle (S608), and stores
I information indicating the long cycle and the short cycle in the storage section 234
\ (S610).
j 15 [0157]
Thereafter, when the MTC terminal 20-4 transitions to the RRC_Idle mode,
5 the receiving cycle control section 224 monitors paging in accordance with the long
J cycle stored in the storage section 234 (S612). Notably, the receiving cycle control
I section 224 may set the receiving cycle just after having transitioned to the RRCIdle
| 20 mode in the short cycle.
j [0158]
On the other hand, when the paging request is supplied from the MME 12
via the Sl-MME interface (S614), the base station 10-4 specifies a timing in
accordance with the long cycle and a timing in accordance with the short cycle
25 (S616), and performs paging at both of the timings (S618, S620). Here, since the
MTC terminal 20-4 is monitoring the paging in accordance with the long cycle, it can
I acquire the paging at the timing according to the long cycle (S620).
j [0159]
1 Thereafter, in the case where the state change is detected by the state
30 detecting section 260 (S622), the receiving cycle control section 224 of the MTC
terminal 20-4 switches the receiving cycle from the long cycle to the short cycle
I
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j (S624).
| [0160]
1 Then, when the paging request is supplied from the MME 12 via the Sl-
| MME interface (S626), the base station 10-4 specifies the timing in accordance with
| 5 the long cycle and the timing in accordance with the short cycle (S628), and
I performs the paging at both of the timings (S630, S632). Here, since the MTC
I terminal 20-4 is monitoring the paging in accordance with the short cycle, it can
acquire the paging at the timing according to the short cycle (S630).
] [°1611
j 10 <2-5. Fifth embodiment
In the above, the fourth embodiment of the invention was described. Next,
the fifth embodiment of the invention will be described. The fifth embodiment of
| the invention is made in view of the same problem as the fourth embodiment of the
^ invention, and an MTC terminal 20-5 of the fifth embodiment of the invention is
15 capable of changing a paging cycle in accordance with a state change while
I maintaining an RRCIdle mode. Hereinbelow, such a fifth embodiment of the
i
! invention will be described in detail. Notably, functional blocks of the MTC
j terminal 20-5 of the fifth embodiment can be configured substantially identical to the
\ functional blocks of the MTC terminal 20-4 of the fourth embodiment, so a detailed
1 20 description thereof will be omitted.
! [0162]
I (Configuration of base station of the fifth embodiment)
j FIG 24 is a functional block diagram showing the configuration of a base
station 10-5 of the fifth embodiment of the invention. As shown in FIG 24, the
I 25 base station 10-5 of the fifth embodiment of the invention includes an antenna 104, a
radio communication section 108, a scheduler 112, a P-RNTI managing section 116,
a paging cycle managing section 125, a storage section 135, a paging control section
145, and a CRC circuit 150. Functions of the antenna 104, the radio
communication section 108, the scheduler 112, the P-RNTI managing section 116,
30 and the CRC circuit 150 are as described in the first embodiment, so hereinbelow,
configurations that differ from the first embodiment will primarily be described.
1
"I
I
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j [0163]
j The paging cycle managing section 125 sets a plurality of cycles for paging
1 each MTC terminal 20-5 operating in an RRCIdle mode. For example, the paging
j cycle managing section 125 sets a long cycle and a short cycle.
j 5 [0164]
j The storage section 135 stores information indicating the plurality of cycles
j (long cycle and short cycle) of each MTC terminal 20-5 set by the paging cycle
j managing section 125.
j [0165]
| 10 The paging control section 145 controls the paging to the MTC terminal 20-
| 5 in the RRCIdle mode by radio frames in accordance with one of the plurality of
j cycles stored in the storage section 135 in connection to the MTC terminal 20-5.
1 [0166]
| Here, the MTC terminal 20-5 of the fifth embodiment switches a receiving
\ 15 cycle for the paging according to the state change of the MTC terminal 20-5, similar
j to the fourth embodiment. On the other hand, a base station 10-5 performs paging
1
j in accordance with a cycle before the switch by the MTC terminal 20-5, even after
j
I the switch of the receiving cycle by the MTC terminal 20-5. Due to this, since the
) MTC terminal 20-5 cannot receive the paging, the base station 10-5 cannot receive a
j 20 response to the paging from the MTC terminal 20-5.
I [0167]
| Thus, in a case where the response to the paging cannot be obtained from
| the MTC terminal 20-5, the base station 10-5 determines that the MTC terminal 20-5
j has switched the receiving cycle, and switches the paging cycle for the MTC
25 terminal 20-5. Hereinbelow, this feature will be described specifically with
reference to FIG. 25 and FIG. 26.
[0168]
FIG. 25 is an explanatory diagram showing a switch of the paging cycle by
the base station 10-5. As shown in FIG. 25, in a case where the MTC terminal 20-5
30 is monitoring the paging in the long cycle, and when the base station 10-5 sends a
paging #21 in accordance with the long cycle, the MTC terminal 20-5 receives this
i
•i I
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| paging #21.
I [0169]
I
•!
j Thereafter, when the MTC terminal 20-5 switches to the short cycle by the
i
state change at t5, the MTC terminal 20-5 can no longer receive a paging #22 that the
1 5 base station 10-5 sends in accordance with the long cycle. Due to this, the paging
control section 145 of the base station 10-5 determines that the MTC terminal 20-5
has switched the receiving cycle since a response to the paging #22 cannot be
obtained, switches the paging cycle to the short cycle and sends a paging #22'.
I
j Since the MTC terminal 20-5 is monitoring the paging in accordance with the short
j
I 10 cycle, it is possible to receive this paging #22'.
I [0170]
I Accordingly, in the case where the base station 10-5 switches the paging
I
| cycle from the long cycle to the short cycle, although time from being called to the
S response will not be shortened, since the paging is sent in accordance with the long
j 15 cycle until when it is necessary, there is an advantage in that resources for the paging
! can be saved.
i
j [0171]
| Notably, normally a plurality of MTC terminals 20-5 belongs to one Pj
RNTI. Further, the plurality of MTC terminals 20-5 belonging to the same P-RNTI
j 20 may include both MTC terminals 20-5 operating in the long cycle and MTC
!
j terminals 20-5 operating in the short cycle. Due to this, the base station 10-5 may
j perform the paging to different MTC terminals 20-5 by using the same P-RNTI at
5 both the timing in accordance with the short cycle and the timing in accordance with
the long cycle.
25 [0172]
; Further, in a case where each of timings that arrives in accordance with the
\ long cycle is identical to the timing that arrives in accordance with the short cycle,
i the MTC terminal 20-5 can receive the paging sent in accordance with the long cycle
even after having switched to the short cycle in regards to the timing. However, in
30 this case, it becomes difficult for the base station 10-5 to determine the switch in the
receiving cycle of the MTC terminal 20-5.
1
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j •
| [0173]
j Thus, the base station 10-5 may allot a P-RNTI for the long cycle and a Pj
RNTI for the short cycle to each MTC terminal 20-5, and may use the P-RNTI for
j
| the long cycle upon performing the paging in accordance with the long cycle, and the
I
| 5 P-RNTI for the short cycle upon performing the paging in accordance with the short
i
cycle. Further, the MTC terminal 20-5 may perform blind decoding using the P-
| RNTI for the long cycle upon monitoring the paging in the long cycle, and perform
1 the blind decoding using the P-RNTI for the short cycle upon monitoring the paging
in the short cycle. According to such a configuration, it becomes possible for the
10 base station 10-5 to determine the switch in the receiving cycle of the MTC terminal
20-5 at a high accuracy.
1 [0174]
I In the above, although an example in which the paging cycle (receiving
j cycle) is switched from the long cycle to the short cycle was described, as will be
J 15 described with reference to FIG 26, a switch from the short cycle to the long cycle is
J also possible.
j [0175]
i
j FIG. 26 is an explanatory diagram showing the switch of the paging cycle
j by the base station 10-5. As shown in FIG 26, in the case where the paging is
i
i
j 20 monitored in the short cycle, the MTC terminal 20-5 receives a paging #31 when the
1
| base station 10-5 sends the paging #31 in accordance with the short cycle.
! [0176]
5
! Thereafter, when the MTC terminal 20-5 switches the receiving cycle to the
i
f long cycle at t6 by the state change, a paging #32 that the base station 10-5 sends in
25 accordance with the short cycle can no longer be received by the MTC terminal 20-5.
1
Due to this, the paging control section 145 of the base station 10-5 determines that
the MTC terminal 20-5 has switched the receiving cycle since a response to the
paging #32 cannot be obtained, switches the paging cycle to the long cycle and sends
a paging #32'. Since the MTC terminal 20-5 is monitoring the paging in
30 accordance with the long cycle, it is possible to receive this paging #32'.
[0177]
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S Accordingly, by the MTC terminal 20-5 switching the receiving cycle from
I the short cycle to the long cycle, consumed power of the MTC terminal 20-5 can be
I
I reduced. Notably, in this case, although time from being called to responding
j becomes long, an undesirable influence therefrom is small since the MTC terminal
j 5 20-5 switches the monitoring cycle of the paging to the long cycle in cases where no
I problem is expected even if the response is delayed.
j [0178]
j (Operation of the fifth embodiment)
1 In the above, the configurations of the base station 10-5 and the MTC
I 10 terminal 20-5 of the fifth embodiment of the invention were described. Next, the
I operation of the fifth embodiment of the invention will be described with reference to
j FIG 27.
j [0179]
| FIG 27 is a sequence diagram showing an operation of the fifth embodiment
jj 15 of the invention. As shown in FIG 27, in a state where the MTC terminal 20-5 is
j operating in the RRC_Connected mode (S702), the base station 10-5 sets the long
\ cycle and the short cycle (S704), and notifies the long cycle and the short cycle to the
j MTC terminal 20-5 (S706).
j [0180]
I 20 The MTC terminal 20-5 returns an ACK responsive to the notification of the
j long cycle and the short cycle to the base station 10-5 (S708), and stores information
indicating the long cycle and the short cycle in the storage section 234 (S710).
j [0181]
Thereafter, when the MTC terminal 20-5 transitions to the RRCIdle mode,
25 the receiving cycle control section 224 monitors the paging in accordance with the
long cycle stored in the storage section 234 (S712). Notably, the receiving cycle
control section 224 may set the receiving cycle just after having transitioned to the
RRCIdle mode in the short cycle.
[0182]
30 On the other hand, when a paging request is supplied from the MME 12 via
the SI-MME interface (S714), the base station 10-5 specifies a timing in accordance
i
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f
] with the long cycle (S716), and performs the paging at the specified timing (S718).
| Here, since the MTC terminal 20-5 is monitoring the paging in accordance with the
| long cycle, the paging from the base station 10-5 can be acquired (S720).
J [0183]
| 5 Thereafter, in a case where the state change is detected by the state detecting
section 260 (S720), the receiving cycle control section 224 of the MTC terminal 20-5
\ switches the receiving cycle from the long cycle to the short cycle (S722).
[0184]
Then, when the paging request is supplied from the MME 12 via the Sl-
10 MME interface (S724), the base station 10-5 specifies a timing in accordance with
the long cycle (S726), and performs the paging at the specified timing (S728).
I However, since the MTC terminal 20-5 is monitoring the paging in accordance with
the short cycle, the base station 10-5 cannot acquire the response to this paging.
[0185]
j 15 Due to this, the paging control section 145 of the base station 10-5
determines that the MTC terminal 20-5 has switched the receiving cycle, and
j performs the paging by switching the paging cycle to the short cycle (S730, S732).
| Here, since the MTC terminal 20-5 is monitoring the paging in accordance with the
j short cycle, the paging sent in S732 can be acquired.
I 20 [0186]
i «3. Conclusion»
As described above, according to the first to third and fifth embodiments of
the invention, it becomes possible for the base station 10 to perform the paging by
switching the plurality of cycles. For example, the base station 10-1 of the first
25 embodiment can perform the paging in accordance with the acyclic pattern in which
the end of the months such as 31st, (January), 28th (February), 31st (March), 30th
(April), and so on arrives.
[0187]
Further, since the base station 10-4 of the fourth embodiment of the
30 invention performs the paging in the plurality of cycles, the MTC terminal 20-4 of
the fourth embodiment can switch the receiving cycle of the paging for example in
I
j
I
1
1
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I
( accordance with the state change of the MTC terminal 20-4 without having have to
communicate with the base station 10-4 in advance.
1
I [0188]
1
| Notably, although preferred embodiments of the invention have been
1 5 described in detail with reference to the attached drawings, the invention is not
I limited to these examples. A person skilled in the art finds various alterations and
I
J modifications within the scope of the appended claims, and it should be understood
I that they will naturally come under the technical scope of the present invention.
j [0189]
I 10 For example, it is possible to combine the technical matters of a plurality of
j embodiments among the first to fifth embodiments of the invention. More
I specifically, combinations of the technical matters of the fourth or fifth embodiment
and the technical matters of the first or second embodiment also belong to the
j technical scope of the invention. For example, in the case of combining the fourth
•k
j 15 embodiment and the first embodiment, the base station 10 may retain a plurality of
j sets of acyclic patterns and perform the paging at timing s in accordance with
J
| respective ones of the plurality of sets of acyclic patterns, and the MTC terminal 20
' may switch the acyclic pattern for monitoring the paging in accordance with the state
* change.
j 20 [0190]
1
| For example, respective steps in the processes by the base station 10 and the
I .
j MTC terminal 20 in the description do not necessarily be performed in chronological
J orders as described in sequence diagrams. For example, the respective steps in the
I
} processes by the base station 10 and the MTC terminal 20 may be performed in
j 25 orders different from the orders described the in sequence diagrams, or may be
1 performed in parallel.
j [0191]
f Further, computer programs for causing hardware such as CPUs, ROMs,
j
j and RAMs installed in the base station 10 and the MTC terminal 20 to exhibit similar
j 30 functions as the respective configurations of the base station 10 and the MTC
; terminal 20 may be produced. Further, storage media storing such computer
!
I
I i
i
I
i
I
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j
j
I programs may also be provided.
i_
1
i Reference Signs List
j [0192]
J 5 10 Base station
I 12 MME
j 14 S-GW
I 20 MTC terminal
1
I 104,204 Antenna
I
1 10 108,208 Radio communication section
i
J
j 112 Scheduler
I
3 116 P-RNTI managing section
| 121 to 125 Paging cycle managing section
j
j 131 to 135,231 to 234 Storage section
•i
| 15 141 to 145 Paging control section
| 150 CRC circuit
| 221 to 224 Receiving cycle control section
I
I 240 Blind decoding section
I
j 250 CRC circuit
j 20 260 State detecting section
j
i
i
|
1
•I
j
1

j
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| CLAIMS
: Claim 1
A base station comprising:
a radio communication section that communicates by radio with a radio
I 5 communication device; and
1 a paging control section that causes the radio communication section to send
| a paging channel for the radio communication device in accordance with a first cycle,
i wherein the paging channel includes information indicating a second cycle,
j and
1 10 wherein the paging control section changes a cycle for sending the paging
j channel from the first cycle to the second cycle.
1
1 Claim 2
I The base station according to claim 1, wherein in a case where no response
15 is made from the radio communication device responsive to a paging channel sent in
accordance with the second cycle, the paging control section returns the cycle for
I sending the paging channel from the second cycle to the first cycle.
1
! Claim 3
1
i 20 A radio communication device comprising:
I
f a radio communication section that receives a paging channel from a base
j station in accordance with a first cycle; and
\ a receipt control section that changes a receiving cycle for receiving the
1 paging channel from the first cycle to a second cycle indicated by the paging channel
I 25 received by the radio communication section.
I
j Claim 4
j A radio communication device comprising:
'' a radio communication section that communicates by radio with a base
30 station that changes a cycle for sending a paging channel to a second cycle in a case
where no response is made from the radio communication device responsive to the
I
I i
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j paging channel sent in accordance with a first cycle;
J
| a detecting section that detects a state change of the radio communication
I device; and
j a receipt control section that switches a receiving cycle for receiving the
I
1 5 paging channel from the first cycle to the second cycle according to a detection result
.4
j
1 obtained by the detecting section.
I
i
I Claim 5
I The radio communication device according to claim 4,
I
j 10 wherein the radio communication section receives a notification indicating
1 the first cycle and the second cycle from the base station, and
I
j wherein the radio communication device further includes a storage section
j
J that stores the first cycle and the second cycle received by the radio communication
1 section.
I 15
1
1 Claim 6
I
| The radio communication device according to claim 5, wherein the receipt
I control section switches the receiving cycle between the first cycle and the second
j cycle in an unconnected state with the base station.
J 2°
I Claim 7
1 The radio communication device according to claim 6, wherein the
•I
| detecting section detects a movement of the radio communication device as the state
1
I change.
I 25
'* Claim 8
- The radio communication device according to claim 7, wherein the
; detecting section detects that the radio communication device has moved to a
: predetermined location as the state change.
• 30
Claim 9
jl
-;!
{11
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I
I The radio communication device according to claim 6, wherein the
i detecting section detects a reduction in a remaining power of the radio
\ communication device as the state change.
1 5 Claim 10
I
j The radio communication device according to claim 6,
1
I wherein the radio communication device has a vending machine function of
I
j selling a product, and
I
I wherein the detecting section detects a change in sales by the vending
I 10 machine function or a reduction in a stock of the product as the state change.
Claim 11
The radio communication device according to claim 6,
wherein a destination of the paging channel is designated by using
j 15 identification information allotted to the radio communication device, and
1 wherein the identification information used in designating the destination
I differs in a paging channel sent in accordance with the first cycle and a paging
I channel sent in accordance with the second cycle.
i
i
j 20 Claim 12
1
j A method for radio communication, the method comprising:
I •
j detecting a state change in the radio communication device; and
j switching a receiving cycle for receiving a paging channel from a base
3 station from a first cycle to a second cycle, the base station being configured to
25 change a cycle for sending the paging channel to a second time in a case where no
response is made from the radio communication device responsive to the paging
channel sent in accordance with the first cycle according to a detection result of the
state change.
30 Claim 13
A program for causing a computer to function as a radio communication
1 ' ;
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I device that includes:
i .
a radio communication section that communicates, by radio with a base
station tttt changes a cycle for sending a paging channel to a second cycle in a case
where n*^ response is made from the radio communication device responsive to the
5 paging channel sent in accordance with a first cycle;
) a detecting section that detects a state change of the radio communication
I device; and
| a receipt control section that switches a receiving cycle for receiving the
| paging channel from the first cycle to the second cycle according to a detection result
I 10 obtained by the detecting section.
1 Claim 14
f
I A base station comprising:
j a radio communication section that communicates by radio with a radio
J 15 communication device; and
a paging control section that changes a cycle for sending a paging channel to
a second cycle in a case where no response is made from the radio communication
device responsive to the paging channel sent in accordance with a first cycle.
i •
20 Claim 15
| A radio communication system comprising:
a radio communication device; and
1 a base station that changes a cycle for sending a paging channel to a second
? j
; cycle in a case where no response is made from the radio communication device
I 25 responsive to the paging channel sent in accordance with a first cycle,
I wherein the radio communication device includes
I a detecting section that detects a state change of the radio
]
i communication device, and
i
j a receipt control section that switches a receiving cycle for
1
30 receiving the paging channel from the first cycle to the second cycleAaccording to a Jj
J detection result obtained by the detecting section.