US20130150109A1 - Base station, method for radio communication, program, radio communication system, and radio terminal - Google Patents
Base station, method for radio communication, program, radio communication system, and radio terminal Download PDFInfo
- Publication number
- US20130150109A1 US20130150109A1 US13/818,697 US201113818697A US2013150109A1 US 20130150109 A1 US20130150109 A1 US 20130150109A1 US 201113818697 A US201113818697 A US 201113818697A US 2013150109 A1 US2013150109 A1 US 2013150109A1
- Authority
- US
- United States
- Prior art keywords
- mtc
- control signal
- base station
- resource information
- radio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000006854 communication Effects 0.000 title claims description 49
- 238000004891 communication Methods 0.000 title claims description 49
- 238000000034 method Methods 0.000 title claims description 37
- 230000000873 masking effect Effects 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 41
- 230000005540 biological transmission Effects 0.000 description 24
- 238000012545 processing Methods 0.000 description 16
- 230000008569 process Effects 0.000 description 15
- 239000000284 extract Substances 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000013506 data mapping Methods 0.000 description 7
- 230000002776 aggregation Effects 0.000 description 5
- 238000004220 aggregation Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 238000013507 mapping Methods 0.000 description 4
- 239000000470 constituent Substances 0.000 description 3
- 238000007726 management method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004590 computer program Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- 230000009469 supplementation Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000007175 bidirectional communication Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H04W72/0406—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/1221—Wireless traffic scheduling based on age of data to be sent
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/04—Interfaces between hierarchically different network devices
- H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface
Definitions
- the invention relates to a base station, a method for radio communication, a program, a radio communication system, and a radio terminal.
- eNodeB Micro-cell base station
- HeNodeB Home eNodeB, femtocell base station, compact base station for cell phones
- RHH Remote Radio Head
- the base station notifies an assignment of a receiver resource to a UE (Downlink Assign), a grant of a transmitter resource (Uplink Grant) and the like by a control signal called PDCCH (Phy Downlink Control Channel).
- resource information such as the Downlink Assign and the Uplink Grant are information for each UE (User Equipment). Due to this, the base station transmits the control signal so that each UE can extract the resource information addressed to itself, and each UE extracts the resource information addressed to itself from the PDCCH by a process called blind decoding.
- the base station describes resource information addressed to each UE in smallest units of the control signal called CCE (Control Channel Element). Further, the base station adds, to the CCE, check bits that are obtained by CRC (Cyclic Redundancy Check) by masking the resource information with C-RNTI (Cell Radio Network Temporary Identify) that is an identifier unique to each UE.
- CRC Cyclic Redundancy Check
- C-RNTI Cell Radio Network Temporary Identify
- the UE When the PDCCH including a plurality of the aforementioned CCEs is received, the UE performs the CRC check by demasking each CCE by the UE's own C-RNTI. That is, the UE performs the CRC check of each CCE on an assumption that each CCE is addressed to itself, and determines the CCE with a normal result as the CCE addressed to itself.
- the above process by the UE is called the blind decoding, and such a blind decoding is described for example in Patent Literature 1.
- MTC Machine Type Communications
- a case may be assumed in which an MTC terminal collects electrocardiogram information of a human, and transmits the electrocardiogram information to a server by using uplink when a certain trigger condition is met.
- a case may be assumed in which a vending machine is caused to function as an MTC terminal, and a server causes the vending machine under management to report sales once every certain cycle (for example, every 30 days).
- Such an MTC terminal by way of example has the following features in general, however, not every MTC terminal needs to have all of the following features, and which of the features is to be endowed depends on applications.
- Patent Literature 1 JP 2009-296589A CL SUMMARY OF INVENTION
- load of the blind decoding in the UE increases due to a range requiring the blind decoding by the UE (including the MTC terminal) being broader.
- the extra-low power consumption is required in the MTC terminal, so the increase in the load of the blind decoding is problematic.
- the invention has been created in view of the above problem, and an aim of the invention is to provide a novel and improved base station, method for radio communication, program, radio communication system, and radio terminal capable of suppressing the load of the blind decoding in the radio terminal.
- a base station including a control signal generating section that generates a control signal which includes resource information identified by a group identifier assigned to a plurality of radio terminals, and a transmitter section that transmits the control signal generated by the control signal generating section.
- An uplink group identifier and a downlink group identifier may be assigned to the plurality of radio terminals, and the control signal generating section may generate the control signal in a manner that uplink resource information is identified by the uplink group identifier and downlink resource information is identified by the downlink group identifier.
- the downlink resource information may be information indicating a resource for the plurality of radio terminals to perform simultaneous reception.
- the uplink resource information may be information indicating a resource that is to be a reference for each of the plurality of radio terminals to decide a relative position of a transmitter resource.
- the control signal generating section may dispose the resource information identified by a same group identifier in a predetermined frequency region in a control region for transmitting the control signal.
- the control signal generating section may add a check bit obtained by masking the resource information with the group identifier to the resource information.
- a method for radio communication including the steps of generating a control signal including resource information identified by a group identifier assigned to a plurality of radio terminals, and transmitting the control signal.
- a program for causing a computer to function as a control signal generating section that generates a control signal including resource information identified by a group identifier assigned to a plurality of radio terminals, and a transmitter section that transmits the control signal generated by the control signal generating section.
- a radio communication system including a plurality of radio terminals, and a base station that includes a control signal generating section that generates a control signal including resource information identified by a group identifier assigned to the plurality of radio terminals, and a transmitter section that transmits the control signal generated by the control signal generating section.
- a radio terminal including a receiver section that receives a control signal from a base station, and an acquiring section that acquires resource information identified by a group identifier assigned to a plurality of radio terminals including the radio terminal from the control signal received by the receiver section.
- the acquiring section may acquire information identified by a terminal identifier assigned to the radio terminal from the control signal in a case of determining that the group identifier is not used by the base station.
- a method for radio communication performed by a radio terminal, the method including the steps of receiving a control signal from a base station, and acquiring resource information identified by a group identifier assigned to a plurality of radio terminals including the radio terminal from the control signal.
- a program for causing a computer to function as a radio terminal that includes a receiver section that receives a control signal from a base station, and an acquiring section that acquires resource information identified by a group identifier assigned to a plurality of radio terminals including the radio terminal from the control signal received by the receiver section.
- the load of the blind decoding in the radio terminal can be suppressed.
- FIG. 1 is an explanatory diagram showing an example of a configuration of a radio communication system.
- FIG. 2 is an explanatory diagram showing a 4G frame format.
- FIG. 3A is an explanatory diagram showing an example of using one Ofdm symbol in a transmission of a PDCCH.
- FIG. 3B is an explanatory diagram showing an example of using two Ofdm symbols in the transmission of the PDCCH.
- FIG. 3C is an explanatory diagram showing an example of using three Ofdm symbols in the transmission of the PDCCH.
- FIG. 4 is an explanatory diagram showing a resource block.
- FIG. 5 is an explanatory diagram showing a specific example of a CCE.
- FIG. 6 is an explanatory diagram showing blind decoding.
- FIG. 7 is an explanatory diagram showing the blind decoding.
- FIG. 8 is a sequence diagram showing an example of a method of assigning C-RNTI and MTC-GP_RNTI.
- FIG. 9 is an explanatory diagram showing a configuration of a base station of a first embodiment of the invention.
- FIG. 10 is an explanatory diagram showing a dispositional relationship of a CCE, a second search space, and an allotted resource.
- FIG. 11 is an explanatory diagram showing a configuration of an MTC terminal of the first embodiment.
- FIG. 12 is a sequence diagram showing an operation of the radio communication system of the first embodiment of the invention.
- FIG. 13 is a sequence diagram showing an example of a method of changing an RNTI used for the blind decoding.
- FIG. 14 is an explanatory diagram showing an example of disposition of the second search space for a certain MTC group.
- FIG. 15 is an explanatory diagram showing an example of disposition of the CCE for each MTC group.
- FIG. 16 is an explanatory diagram showing a specific example of an MTC group to which MTC terminals belong.
- FIG. 17 is an explanatory diagram corresponding to a fourth embodiment.
- FIG. 18 is an explanatory diagram showing a relationship of a reference resource block and an uplink resource block of each MTC terminal.
- FIG. 19 is an explanatory diagram showing a modification of the relationship of the reference resource block and the uplink resource block of each MTC terminal.
- FIG. 20 is an explanatory diagram showing an operation of a radio communication system of a fifth embodiment.
- the plurality of constituent features having substantially the same functional configuration may be distinguished as MTC terminals 20 A, 20 B, and 20 C.
- 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.
- the MTC terminals 20 A, 20 B, and 20 C do not particularly need to be distinguished, each will simply be termed a MTC terminal 20 .
- 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.
- FIG. 1 is an explanatory diagram showing an example of a configuration of a radio communication system 1 .
- the radio communication system 1 includes a base station 10 , a core network including an MME (Mobility Management Entity) 12 , an S-GW (Serving Gateway) 14 , and a PDN (Packet Data Network)-GW 16 , MTC terminals 20 , and an MTC server 30 .
- MME Mobility Management Entity
- S-GW Serving Gateway
- PDN Packet Data Network
- 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 .
- the base station 10 may for example be an eNodeB, a relay node, or a Home eNodeB that is a compact base station for home use.
- the MTC terminals 20 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.
- UE user equipment
- the base station 10 is a radio base station that communicates with the MTC 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 depiction in FIG. 1 is omitted, the base station 10 communicates also with other user equipments such as a non-MTC terminal.
- the MME 12 is a device that performs controls of settings, opening, and hand-over of a data communication session.
- the MME 12 is connected to the base station 10 via an interface called X2.
- the S-GW 14 is a device that performs routing and transfer of user data.
- the PDN-GW 16 functions as a connecting node with an IP service network, and transfers the user data to and from the IP service network.
- the MTC terminals 20 are radio terminals specialized for MTC, which is a communication between machines and is not used directly by a human, which is under discussion in the 3GPP.
- the MTC terminals 20 perform radio communication in accordance with an application with the base station 10 . Further, the MTC terminals 20 perform bidirectional communication with the MTC server 30 via the core network.
- a case may be assumed 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.
- a case may be 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 sales once every certain cycle (for example, every 30 days).
- 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.
- FIG. 2 is an explanatory diagram showing a 4G frame format.
- a 10 ms radio frame is configured of ten 1 ms sub frames #0 to #9. Further, each 1 ms sub frame is configured of two 0.5 ms slots. Further, each 0.5 ms slot is configured of seven Ofdm symbols.
- the Ofdm symbol is a unit used in a communication scheme of an OFDM (Orthogonal Frequency Division Multiplexing) modulation system, and is a unit by which data processed in one FFT (Fast Fourier Transform) is outputted.
- OFDM Orthogonal Frequency Division Multiplexing
- FFT Fast Fourier Transform
- a control signal called a PDCCH Physical Downlink Control Channel
- PDCCH Physical Downlink Control Channel
- FIG. 3A to FIG. 3C one Ofdm symbol to three Ofdm symbols at the head of the sub frame are used for a transmission of the PDCCH. That is, there are cases in which one Ofdm symbol is used for the PDCCH transmission, and there also are cases in which three Ofdm symbols are used for the PDCCH transmission.
- 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 PDSCH (Phy Downlink Shared Channel) or a PUSCH (Phy Uplink Shared Channel) is called a data region.
- a PDSCH Physical Downlink Shared Channel
- a PUSCH Physical Uplink Shared Channel
- control information included in the PDCCH will be described.
- control information are included in the PDCCH, the following two pieces of control information are primarily included.
- a minimum unit of the resource block is twelve subcarriers x seven Ofdm symbols.
- the PDCCH further includes power control information, paging indexes, system information and the like.
- the resource information such as assign and grant as above are information for each UE. Due to this, the eNodeB transmits the PDCCH so that each UE can extract the resource information addressed to itself, and each UE extracts the resource information addressed to itself from the PDCCH by a process called blind decoding. Hereinbelow, this feature will be described in detail.
- the eNodeB includes the resource information for each UE, and generates CCEs identified by a C-RNTI (Cell Radio Network Temporary Identify) that is an identifier of each UE.
- C-RNTI Cell Radio Network Temporary Identify
- FIG. 5 is an explanatory diagram showing a specific example of the CCE.
- the CCE includes target information such as the resource information, as well as a check bit that is obtained by a CRC (Cyclic Redundancy Check) by masking the resource information with the C-RNTI (Cell Radio Network Temporary Identify).
- the masking may be an exclusive disjunction calculation (XOR) of the resource information and the C-RNTI, or may be a serial coupling of the resource information and the C-RNTI.
- the UE When the PDCCH including the aforementioned plurality of CCEs is received, the UE extracts the CCE identified by its own C-RNTI by the blind decoding.
- the CCE identified by its own C-RNTI By the blind decoding.
- FIG. 6 and FIG. 7 are explanatory diagrams showing the blind decoding.
- the UE performs CRC check by demasking each CCE with its own C-RNTI. Further, the UE performs the blind decoding on each CCE in an order shown in FIG. 7 . That is, the UE performs the CRC check of each CCE on an assumption that each CCE is addressed to itself, and determines the CCE with a normal result as the CCE addressed to itself.
- the CCE aggregation is a mode in which CCEs are transmitted at an amount that is one, two, four, or eight times the typical unit of the CCE.
- the CCEs are transmitted by being repeated eight times.
- the check bit by the CRC is added to the result of the eight times of repetition. Accordingly, the UE performs the blind decoding by taking into account a possibility that the CCE aggregation has been performed.
- RNTIs such as a P-RNTI for acquiring information for paging and an SI-RNTI for acquiring system information exist. Accordingly, the UE performs the blind decoding by assuming by which of the RNTIs each of the CCEs is to be identified.
- the base station due to the introduction of the aforementioned MTC terminals, increases are expected in a number of terminals existing within each cell, a number of terminals the base station is to contain in an Active mode, and a number of terminals for the base station 10 to simultaneously control in the PDCCH. Further, the CCE included in the PDCCH also increases accompanying the increase in the number of terminals simultaneously controlled in the PDCCH.
- load of the blind decoding in the UE increases due to a range requiring the blind decoding by the UE (including the MTC terminal) being broader.
- the extra-low power consumption is required in the MTC terminal, so the increase in the load of the blind decoding is problematic.
- each embodiment is implemented by using an MTC-GP_RNTI which is an identifier of an MTC group assigned to the MTC terminal 20 .
- MTC-GP_RNTI is an identifier of an MTC group assigned to the MTC terminal 20 .
- FIG. 8 is a sequence diagram showing an example of a method of assigning C-RNTI and MTC-GP_RNTI. As shown in FIG. 8 , firstly, in a random access procedure formed of Step 1 to Step 4 , the C-RNTIs are assigned to each MTC terminal 20 .
- the MTC terminal 20 transmits a preamble to a random access window in a radio frame (Step 1 ).
- the base station 10 transmits a random access response to the MTC terminal 20 (Step 2 ).
- the base station 10 assigns a Temporary C-RNTI to the MTC terminal 20 in this random access response.
- the MTC terminal 20 transmits an L2/L3 message to the base station 10 (Step 3 ).
- the MTC terminal 20 determines that a random access had been successful by receiving a contention resolution message transmitted from the base station 10 (Step 4 ), and begins using the Temporary C-RNTI assigned in Step 2 as the C-RNTI.
- an MTC category setting procedure formed of Step 5 and Step 6 is performed. More specifically described, since the MTC terminal 20 is set with information of an MTC category indicating whether the MTC terminal 20 itself is an MTC terminal or not, the MTC terminal 20 is aware that itself is an MTC terminal. Due to this, the MTC terminal 20 notifies the base station 10 of the MTC category (Step 5 ), and receives a notification confirming signal from the base station 10 (Step 6 ). Notably, the MTC category may include information indicating a capacity of the MTC terminal 20 , such as whether the MTC terminal 20 is compliant with a long sleep mode for over one month or not.
- the MTC-GP_RNTI is assigned to the MTC terminal 20 . More specifically described, the MTC terminal 20 performs an MTC group setting request to the base station 10 (Step 7 ). The base station 10 transfers the aforementioned setting request to the MME 12 together with a terminal ID of the MTC terminal 20 (a unique number described in an SIM, and is different from the RNTI).
- the MME 12 is a device that handles the unique information of the terminals, receives correspondence information of an MTC group and the terminal IDs of the terminals that are granted to enter the MTC group from the MTC server 30 , and retains the correspondence information.
- the MME 12 determines whether an MTC terminal 20 having the terminal ID transferred from the base station 10 is allowed to enter the MTC group or not based on the correspondence information, and if the MTC terminal 20 is allowed to enter, the MME 12 transmits an MTC group setting confirming signal to the base station 10 .
- the base station 10 transmits the MTC-GP_RNTI to the MTC terminal 20 together with the MTC group setting confirming signal (Step 8 ). Then, the MTC terminal 20 becomes capable of using the MTC-GP_RNTI by receiving the MTC group setting confirming signal and the MTC-GP_RNTI from the base station 10 .
- the method of assigning the MTC-GP_RNTI is described above, however, the method of assigning the MTC-GP_RNTI is not limited to the above example.
- information such as an AC (Access Class) that is predeterminedly set in the MTC terminal 20 may be used as the MTC-GP_RNTI, and the MTC-GP_RNTI may be assigned to the MTC terminal 20 by a human operation.
- FIG. 9 is an explanatory diagram showing a configuration of a base station 10 of the first embodiment of the invention.
- the base station 10 of the first embodiment includes an antenna 104 , a radio processing section 108 , a storage section 112 , a scheduler 116 , a control signal generating section 120 , a CRC circuit 124 , and a data mapping section 128 .
- the antenna 104 functions as a transmitter section that transmits a transmitter signal such as a PDCCH (control signal) and a PDSCH (data signal) supplied from the radio processing section 108 as a radio signal, and as a receiver section that converts the radio signal transmitted from a radio communication device such as an MTC terminal 20 into an electric receiver signal, and supplies the receiver signal to the radio processing section 108 .
- a transmitter signal such as a PDCCH (control signal) and a PDSCH (data signal) supplied from the radio processing section 108 as a radio signal
- a receiver section that converts the radio signal transmitted from a radio communication device such as an MTC terminal 20 into an electric receiver signal, and supplies the receiver signal to the radio processing section 108 .
- the base station 10 may include a plurality of antennas.
- the base station 10 is capable of realizing an MIMO (Multiple Input, Multiple Output) communication, a diversity communication and the like.
- MIMO Multiple Input, Multiple Output
- the radio processing section 108 performs radio processes for transmission such as modulation, DA conversion, filtering, amplification, and up-conversion of the transmitter signal such as the PDCCH supplied from the control signal generating section 120 , the PDSCH supplied from the data mapping section, and the like.
- the radio processing section 108 performs radio processes for reception such as down-conversion, filtering, DA conversion, and demodulation of the receiver signal supplied from the antenna 104 .
- the storage section 112 stores the MTC-GP_RNTIs, the C-RNTIs and the like that are assigned to the respective MTC terminals 20 . Further, although depiction is omitted in FIG. 9 , the storage section 112 also stores other RNTIs such as SI-RNTIs, P-RNTIs, and RA-RNTIs.
- the scheduler 116 allots a resource to each MTC terminal 20 for data communication. That is, the scheduler 116 allots resource blocks among the PDSCH that the respective MTC terminals 20 are to receive, and resource blocks among the PUSCH that the respective MTC terminals 20 are to transmit.
- the control signal generating section 120 generates a PDCCH formed of a plurality of CCEs.
- the control signal generating section 120 generates a CCE including information indicating a second search space arranged within data region (reference information) and a check bit obtained by the CRC circuit 124 by masking the aforesaid information by the MTC-GP_RNTI.
- the masking may be an exclusive disjunction calculation (XOR) of the information indicating the second search space and the MTC-GP_RNTI, or may be a serial coupling of the information indicating the second search space and the C-RNTI.
- XOR exclusive disjunction calculation
- an MTC terminal 20 within an MTC group to which the MTC-GP_RNTI is assigned can be designated as a destination of the information indicating the second search space.
- control signal generating section 120 may designate the designation of the CCE simply by attaching the MTC-GP_RNTI to the information indicating the second search space.
- control signal generating section 120 generates information for mapping in the second search space, and supplies the same to the data mapping section 128 together with information indicating a position of the second search space.
- the information for mapping in the second search space is the resource information for the respective MTC terminals 20 within the MTC group to which the MTC-GP_RNTI is assigned.
- a check bit obtained by the CRC circuit 124 by masking the aforesaid information with the C-RNTIs of the respective MTC terminals 20 is added to the resource information for the respective MTC terminals 20 .
- the data mapping section 128 maps user data for each MTC terminal 20 supplied from an upper layer in the resource block allotted by the scheduler 116 among the PDSCH that the respective MTC terminals 20 are to receive. Further, the data mapping section 128 maps the resource information of the respective MTC terminals 20 supplied from the control signal generating section 120 in the second search space.
- a disposition relationship of the CCE, the second search space, the allotted resource and the like will be described more specifically with reference to FIG. 10 .
- FIG. 10 is an explanatory diagram showing the disposition relationship of the CCE, the second search space, and the allotted resource.
- a CCE # 1 describes information indicating a position of a second search space # 1 for an MTC group having an MTC-GP_RNTI corresponding to a check bit added to the CCE # 1 .
- resource information # 1 indicates a resource block # 1 for the MTC terminal 20 having a C-RNTI corresponding to a check bit added to the resource information # 1 .
- resource information # 2 indicates a resource block # 2 for the MTC terminal 20 having a C-RNTI corresponding to a check bit added to the resource information # 2 .
- a CCE # 2 shown in FIG. 10 describes information indicating a position of a second search space # 2 for an MTC group having an MTC-GP_RNTI corresponding to a check bit added to the CCE # 2 .
- resource information # 3 indicates a resource block # 3 for the MTC terminal 20 having a C-RNTI corresponding to a check bit added to the resource information # 3 .
- the CCE and the second search space may be disposed in the same sub frame as with the CCE # 1 and the second search space # 1 , or may be disposed in different sub frames as with the CCE # 2 and the second search space # 2 .
- Such a relationship of the CCE and the second search space may fixedly be set by signaling in advance, or may be designated by the CCE.
- the resource blocks are disposed in a sub frame that is after the sub frame of the second search space, such as with the resource block # 1 and the resource block # 2 .
- Such a relationship of the second search space and the allotted resource blocks of the respective MTC terminals 20 may fixedly be set by signaling in advance, or may be designated by the second search space.
- FIG. 11 is an explanatory diagram showing the configuration of the MTC terminal 20 of the first embodiment.
- the MTC terminal 20 of the first embodiment includes an antenna 204 , a radio processing section 208 , a storage section 212 , a blind decoding section 220 , and a CRC circuit 224 .
- the antenna 204 functions as a transmitter section that transmits a transmitter signal such as a PUSCH(data signal) supplied from the radio processing section 208 as a radio signal, and as a receiver section that converts the radio signal such as the PDCCH and the PDSCH transmitted from a base station 10 into an electric receiver signal, and supplies the receiver signal to the radio processing section 208 .
- a transmitter signal such as a PUSCH(data signal) supplied from the radio processing section 208 as a radio signal
- a receiver section that converts the radio signal such as the PDCCH and the PDSCH transmitted from a base station 10 into an electric receiver signal, and supplies the receiver signal to the radio processing section 208 .
- the MTC terminal 20 may include a plurality of antennas.
- the MTC terminal 20 is capable of realizing an MIMO (Multiple Input, Multiple Output) communication, a diversity communication and the like.
- MIMO Multiple Input, Multiple Output
- the radio processing section 208 performs radio processes for transmission such as modulation, DA conversion, filtering, amplification, and up-conversion of user data supplied from an upper layer. Further, the radio processing section 208 performs radio processes for reception such as down-conversion, filtering, DA conversion, and demodulation of the receiver signal supplied from the antenna 104 .
- the storage section 212 stores for example the MTC-GP RNTIs, the C-RNTIs and the like that are assigned from the base station 10 . Further, although depiction is omitted in FIG. 11 , the storage section 212 also stores other RNTIs such as SI-RNTI, P-RNTI, and RA-RNTI.
- the blind decoding section 220 extracts the CCE identified by the MTC-GP_RNTI assigned to the MTC terminal 20 by the blind decoding. More specifically described, the blind decoding section 220 operates in cooperation with the CRC circuit 224 to perform CRC check by demasking each CCE by the MTC-GP_RNTI assigned to the MTC terminal 20 . Then, the blind decoding section 220 extracts the CCE with a normal result, and specifies the second search space based on the information described in the CCE. For example, the blind decoding section 220 extracts the CCE # 1 shown in FIG. 10 from the PDCCH, and specifies the second search space # 1 based on the information described in the CCE # 1 .
- the blind decoding section 220 acquires the resource information addressed to itself by performing the blind decoding using the C-RNTI on the second search space specified from the CCE. More specifically, the blind decoding section 220 operates in cooperation with the CRC circuit 224 to perform CRC check by demasking each resource information in the second search space using the C-RNTI. Then, the blind decoding section 220 acquires the resource information with a normal result as the resource information addressed to itself. Thereafter, the radio processing section 208 performs the transmission process or the reception process in the resource block indicated by the resource information. For example, the blind decoding section 220 acquires the resource information # 1 in the second search space # 1 shown in FIG. 10 as the resource information addressed to itself. Thereafter, the radio processing section 208 performs the reception process in the resource block # 1 indicated by the resource information # 1 .
- the resource information for a large number of MTC terminals 20 can be contained. Further, since a number of the CCEs in the PDCCH can be suppressed, the search space in which the MTC terminal 20 performs the blind decoding can be reduced. As a result, load related to the blind decoding in the MTC terminal 20 can be reduced.
- the resource information for the respective MTC terminals 20 are mapped in the second search space was described above, the first embodiment is not limited to this example. For example, communication controlling information for each MTC terminal 20 such as transmission power and transmission rate, and other various types of information for each MTC terminal 20 may be mapped in the second search space.
- FIG. 12 is a sequence diagram showing the operation of the radio communication system 1 of the first embodiment of the invention.
- the base station 10 firstly decides a second search space for one MTC group (S 310 ).
- the control signal generating section 120 of the base station 10 describes information indicating the decided second search space in the CCE in the PDCCH in a state capable of being identified by MTC-GP_RNTI assigned to the MTC group (S 320 ). More specifically, the control signal generating section 120 adds a check bit obtained by the CRC circuit 124 by masking the information indicating the second search space with the MTC-GP_RNTI to the CCEs.
- the data mapping section 128 of the base station 10 maps the resource information for each MTC terminal 20 belonging to the MTC group in the second search space of the PDSCH in a state capable of being identified by C-RNTI assigned to each MTC terminal 20 (S 330 ). Thereafter, the base station 10 transmits the PDCCH and the PDSCH (S 340 ).
- the blind decoding section 220 of the MTC terminal 20 performs the blind decoding on the respective CCEs in the PDCCH using the MTC-GP_RNTI assigned to itself (S 350 ), and specifies the second search space for the MTC group including the terminal itself (S 360 ).
- the blind decoding section 220 of the MTC terminal 20 performs the blind decoding on the second search space in the PDSCH using the C-RNTI (S 370 ), and acquires the resource information for the terminal itself (S 380 ). Thereafter, the MTC terminal 20 performs the reception process or the transmission process in the resource block indicated by the acquired resource information.
- the base station 10 of the first embodiment of the invention transmits the PDCCH by describing the information indicating the second search space in the CCEs in the state capable of being identified by the MTC-GP_RNTI.
- the base station 10 transmits the PDCCH by describing the resource information for the MTC terminal 20 in the CCEs in a state capable of being identified by the C-RNTI of the MTC terminal 20 may also be possible.
- the MTC terminal 20 may perform the blind decoding of the PDCCH by using both the MTC-GP_RNTI and the C-RNTI. Even in the case of performing the blind decoding of the PDCCH by using both the MTC-GP_RNTI and the C-RNTI, since the search space is made small according to the first embodiment of the invention, load on the MTC terminal 20 can be suppressed sufficiently.
- the MTC terminal 20 may perform the blind decoding by using only the C-RNTI.
- the base station 10 cannot handle the MTC-GP RNTI
- a case in which the MTC terminal 20 is connected to a new base station 10 by a hand-over, or a case in which the base station 10 does not have a capability to handle the MTC-GP_RNTI is expected.
- the MTC terminal 20 may change the RNTI to be used in the blind decoding by requesting a setting change to the base station 10 .
- FIG. 13 is a sequence diagram showing an example of a method of changing the RNTI used for the blind decoding.
- the MTC terminal 20 performs the blind decoding of the PDCCH by using both the MTC-GP_RNTI and the C-RNTI, a setting request of MTC-GP_Only_Mod can be transmitted to the base station 10 (S 410 ).
- the base station 10 sets the MTC-GP_Only_Mod that describes the information indicating at least the second search space for the MTC group to which the MTC terminal 20 belongs in the CCE in a state capable of being identified by the MTC-GP_RNTI. Then, the base station 10 transmits a setting confirming signal of the MTC-GP_Only_Mod to the MTC terminal 20 (S 420 ). Notably, the base station 10 may transmit the setting confirming signal of the MTC-GP_Only_Mod to all of the MTC terminals belonging to the MTC group.
- the MTC terminal 20 After receiving the setting confirming signal of the MTC-GP_Only_Mod, the MTC terminal 20 performs the blind decoding by using only the MTC-GP_RNTI.
- the MTC terminal 20 transmits a release request of the MTC-GP_Only_Mod to the base station 10 , (S 430 ), the base station 10 releases the setting of the MTC-GP_Only_Mod, and transmits a release confirming signal of the MTC-GP_Only_Mod to the MTC terminal 20 (S 440 ). After having received the release confirming signal of the MTC-GP_Only_Mod, the MTC terminal 20 again performs the blind decoding of the PDCCH using both the MTC-GP_RNTI and the C-RNTI.
- the first embodiment of the invention was described. Now, a second embodiment of the invention will be described. Notably, since the second embodiment to the seventh embodiment described below have a large number of portions in common with the first embodiment, detailed descriptions for the portions in common with the first embodiment will be omitted. Further, the second embodiment to the seventh embodiment will be described by reusing the configurational diagram of the base station 10 shown in FIG. 9 and the configurational diagram of the MTC terminal 20 shown in FIG. 11 .
- FIG. 14 is an explanatory diagram showing an example of disposition of the second search space for a certain MTC group.
- a base station 10 may dispose second search spaces # 1 to # 3 at a same position that one CCE # 1 indicates over a plurality of sub frames.
- an MTC terminal 20 needs to know over how many sub frames the second search spaces are to be disposed at the same position. Due to this, the base station 10 may notify a number of the sub frames in CCE, or may notify the number of the sub frames to the MTC terminal 20 in advance.
- an MTC terminal 20 searches the following Ofdm symbol again in the frequency direction. Due to this, in an LTE, a search in the frequency direction with a minimum width of 5 MHz and a maximum width of 20 MHz is required.
- the MTC terminal 20 in some cases is required to have an extra low power consumption, and of an operation efficiency of a digital circuit, it is effective to make the search width in the frequency direction be 5 MHz or less, for example, 1 MHz or less.
- the base station 10 of the third embodiment disposes the CCEs for the same MTC group in a predetermined sub carrier.
- specific descriptions will be given with reference to FIG. 15 .
- FIG. 15 is an explanatory diagram showing an example of disposition of the CCEs for each MTC group.
- the base station 10 of the third embodiment for example disposes CCE for an MTC terminal 20 belonging to an MTC group 1 in a sub carrier x, and disposes CCE for an MTC terminal 20 belonging to an MTC group 2 in a sub carrier y.
- the base station 10 may notify the MTC terminals 20 in advance of information indicating which sub carrier the CCE for each MTC group is going to be disposed in.
- the MTC terminal 20 belonging to the MTC group 1 can simply perform the blind decoding only on the sub carrier x in a time direction, and the MTC terminal 20 belonging to the MTC group 2 can simply perform the blind decoding only on the sub carrier y in the time direction.
- load related to the blind decoding in the MTC terminal 20 can significantly be reduced.
- MTC terminals 20 belong to one MTC group and one MTC-GP_RNTI is assigned was described.
- MTC terminals 20 are grouped separately for uplink and downlink is also expected.
- the fourth embodiment focuses on this feature, and MTC terminals 20 of the fourth embodiment belong to a plurality of MTC groups, and a plurality of MTC-GP_RNTIs are assigned.
- a specific example will be described with reference to FIG. 16 .
- FIG. 16 is an explanatory diagram showing a specific example of an MTC group to which MTC terminals 20 belong.
- the MTC terminals 20 of the fourth embodiment belong to an uplink MTC group and a downlink MTC group.
- an MTC terminal 20 A belongs to a downlink MTC group 1 and an uplink MTC group 1
- an MTC terminal 20 B belongs to the downlink MTC group 1 and an uplink MTC group 3 .
- MTC-DownLink_RNTI that is a downlink group identifier and MTC-UpLink_RNTI that is an uplink group identifier are assigned to each MTC terminal 20 .
- a base station 10 generates the CCE including information indicating a second search space for the uplink by using the MTC-UpLink_RNTI, and generates the CCE including information indicating a second search space for the downlink by using the MTC-DownLink_RNTI.
- the base station 10 in a case of describing the information indicating the second search space for the uplink MTC group 1 in the CCE # 4 shown in FIG. 17 , the base station 10 generates the CCE # 4 by using the MTC-UpLink_RNTI assigned to the uplink MTC group 1 .
- the base station 10 in a case of describing the information indicating the second search space for the downlink MTC group 2 in the CCE # 5 shown in FIG. 17 , the base station 10 generates the CCE # 5 by using the MTC-DownLink_RNTI assigned to the downlink MTC group 2 .
- the MTC terminal 20 can extract the CCE for the MTC group to which the MTC terminal 20 belongs by performing blind decoding on each CCE in the PDCCH by using the MTC-DownLink_RNTI and the MTC-UpLink_RNTI.
- the first embodiment to the fourth embodiment make the search space in the PDCCH small by using the second search space.
- the fifth embodiment to the seventh embodiment described below make the search space in the PDCCH small by describing the resource information shared by a plurality of MTC terminals 20 configuring an MTC group in the CCE.
- the fifth embodiment to the seventh embodiment will orderly be described.
- a base station 10 can use a common command for instructing a plurality of MTC terminals 20 to report the accumulated information.
- the base station 10 describes resource information indicating a resource block to which the plurality of MTC terminals 20 in an MTC group is to perform a reception process in the CCE. Further, the base station 10 transmits the CCE in a state capable of being identified by MTC-GP_RNTI by adding a check bit based on the MTC-GP RNTI assigned to the MTC group to the CCEs.
- the plurality of MTC terminals 20 in the MTC group performs blind decoding using the MTC-GP_RNTI, and extracts the CCE identified by the MTC-GP_RNTI. Further, the plurality of MTC terminals 20 in the MTC group simultaneously performs the reception process in the resource block indicated by the resource information described in the extracted CCE.
- the search space in the PDCCH can further be made smaller.
- the base station 10 In an uplink, if the plurality of MTC terminals 20 performs a transmission process in the same resource block, uplink data collapses at the base station 10 .
- the base station 10 describes resource information indicating a reference resource block for the uplink of the MTC group in the CCE. Further, the base station 10 transmits the CCE in a state capable of being identified by MTC-GP_RNTI by adding a check bit based on the MTC-GP_RNTI assigned to the MTC group to the CCEs.
- the plurality of MTC terminals 20 in the MTC group performs blind decoding using the MTC-GP_RNTI, and extracts the CCE identified by the MTC-GP_RNTI. Further, the plurality of MTC terminals 20 in the MTC group specifies the reference resource block indicated by the resource information described in the extracted CCE, and performs the transmission process in the resource block that is in a positional relationship with the reference resource block as set in advance.
- this feature will be described more specifically with reference to FIG. 18 .
- FIG. 18 is an explanatory diagram showing a relationship of a reference resource block and an uplink resource block of each MTC terminal 20 .
- resource information indicating a resource block # 1 as the reference resource block of the uplink of a MTC group 1 is described in CCE # 6 .
- the MTC group 1 is configured of MTC terminals 20 A to 20 D, and a relative position of a resource block to be used for the uplink by each MTC terminal 20 from the reference resource block is set.
- the MTC terminals 20 A to 20 D specify the resource block # 1 that is the reference resource block, and perform the transmission process by using the resource block that is at the set relative position from the reference resource block.
- the MTC terminal 20 A uses the resource block # 1 that is the reference resource block
- the MTC terminal 20 B uses a resource block # 2 that is adjacent with the resource block # 1 in the time direction.
- the MTC terminal 20 C uses a resource block # 3 that is adjacent with the resource block # 2 in the time direction
- the MTC terminal 20 D uses a resource block # 4 that is adjacent with the resource block # 3 in the time direction.
- settings may be made with a reference resource block as an origin to use resource blocks that are adjacent in a frequency direction in an order of MTC terminals 20 A, 20 B, 20 C, and 20 D.
- the MTC terminal 20 A uses a resource block # 1 that is the reference resource block
- the MTC terminal 20 B uses the resource block # 5 that is adjacent to the resource block # 1 in the frequency direction.
- the MTC terminal 20 C uses the resource block # 6 that is adjacent to the resource block # 5 in the frequency direction
- the MTC terminal 20 D uses the resource block # 7 that is adjacent to the resource block # 6 in the frequency direction.
- the base station 10 may signal the positional relationship of the resource block to which each MTC terminal 20 is to perform the transmission process and the reference resource block in advance to each MTC terminal 20 .
- the fifth embodiment may be implemented by replacing the MTC-GP_RNTI with the C-RNTI.
- the base station 10 can allot the same C-RNTI to a plurality of MTC terminals 20 , and the C-RNTI may be used in a similar way as with the above MTC-GP_RNTI.
- FIG. 20 is an explanatory diagram showing the operation of the radio communication system 1 of the fifth embodiment.
- the base station 10 transmits relative position information indicating the positional relationship of the resource blocks to which the MTC terminals 20 are to perform the transmission to the MTC terminals 20 in advance (S 510 ).
- the control signal generating section 120 of the base station 10 describes the resource information for each MTC terminal 20 belonging to the MTC group in a state capable of being identified by the MTC-GP_RNTI assigned to the MTC group to the CCEs in the PDCCH (S 520 ). Specifically, the control signal generating section 120 adds the check bit obtained by the CRC circuit 124 by masking the resource information for each MTC terminal 20 with the MTC-GP_RNTI to the CCEs. Then, the base station 10 transmits the PDCCH including the CCE in which the resource information for each MTC terminal 20 is described (S 530 ).
- the blind decoding section 220 of the MTC terminal 20 performs blind decoding on each CCE in the PDCCH by using the MTC-GP_RNTI assigned to itself (S 540 ), and obtains the resource information for the MTC group including itself (S 550 ).
- the MTC terminal 20 performs the reception process in the resource block indicated by the resource information (S 570 ).
- the MTC terminal 20 performs the transmission process in the resource block that is in the positional relationship as indicated by the relative position information with the reference resource block indicated by the resource information (S 580 ).
- the search space in the PDCCH can be made small. As a result, load related to the blind decoding in the MTC terminals 20 can be reduced.
- the sixth embodiment is implemented by adapting the third embodiment described with reference to FIG. 15 to the fifth embodiment. Specifically, a base station 10 according to the sixth embodiment disposes a CCE including resource information for one MTC group in a predetermined sub carrier. According to the configuration, since an MTC terminal 20 simply needs to perform blind decoding on only the predetermined sub carrier in a time direction, load related to the blind decoding in the MTC terminal 20 can be reduced significantly.
- the seventh embodiment is implemented by adapting the fourth embodiment described with reference to FIG. 16 to the fifth embodiment.
- an MTC terminal 20 of the seventh embodiment belongs to an uplink MTC group and a downlink MTC group. Due to this, the MTC terminal 20 is assigned with MTC-DownLink_RNTI that is a group identifier for downlink, and MTC-UpLink_RNTI that is a group identifier for uplink.
- the base station 10 generates the CCE including the uplink resource information of the MTC group by using the MTC-UpLink_RNTI, and generates the CCE including the downlink resource information by using the MTC-DownLink_RNTI.
- the MTC terminal 20 can extract the CCE for the MTC group to which the MTC terminal 20 belongs by performing blind decoding on each CCE in the PDCCH by using the MTC-DownLink_RNTI and the MTC-UpLink_RNTI.
- the resource information for a large number of MTC terminals 20 can be stored by mapping the resource information (assign, grant) for each MTC terminal 20 in the second search space in the PDSCH. Further, since a number of the CCEs in the PDCCH can be suppressed, the search space in which the MTC terminal 20 performs the blind decoding can be reduced. As a result, load related to the blind decoding in the MTC terminal 20 can be reduced.
- the resource information described in the CCE in the PDCCH can be shared by the plurality of MTC terminals 20 in the MTC group. Due to this, the resource information for each MTC terminal 20 no longer needs to be described in separate CCEs, so the search space in the PDCCH can be made small. As a result, load related to the blind decoding in the MTC terminals 20 can be reduced.
- respective steps in the processes by the base station 10 and the MTC terminal 20 in the description do not necessarily be performed in chronological orders as described in sequence diagrams.
- the respective steps in the processes by the base station 10 and the MTC terminal 20 may be performed in orders different from the orders described the in sequence diagrams, or may be performed in parallel.
- computer programs for causing hardware such as CPUs, ROMs, and RAMs installed in the base station 10 and the MTC terminal 20 to exhibit similar functions as the respective configurations of the base station 10 and the MTC terminal 20 may be produced. Further, storage media storing such computer programs may also be provided.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
- The invention relates to a base station, a method for radio communication, a program, a radio communication system, and a radio terminal.
- Currently, standardization of a 4G radio communication system is under 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. Further, considerations are given to improving coverage by introducing base stations other than eNodeB (macro-cell base station), such as HeNodeB (Home eNodeB, femtocell base station, compact base station for cell phones) and RHH (Remote Radio Head).
- (Blind Decoding)
- In a radio communication system as above, the base station notifies an assignment of a receiver resource to a UE (Downlink Assign), a grant of a transmitter resource (Uplink Grant) and the like by a control signal called PDCCH (Phy Downlink Control Channel). Here, resource information such as the Downlink Assign and the Uplink Grant are information for each UE (User Equipment). Due to this, the base station transmits the control signal so that each UE can extract the resource information addressed to itself, and each UE extracts the resource information addressed to itself from the PDCCH by a process called blind decoding. Hereinbelow, this feature will be described in detail.
- The base station describes resource information addressed to each UE in smallest units of the control signal called CCE (Control Channel Element). Further, the base station adds, to the CCE, check bits that are obtained by CRC (Cyclic Redundancy Check) by masking the resource information with C-RNTI (Cell Radio Network Temporary Identify) that is an identifier unique to each UE.
- When the PDCCH including a plurality of the aforementioned CCEs is received, the UE performs the CRC check by demasking each CCE by the UE's own C-RNTI. That is, the UE performs the CRC check of each CCE on an assumption that each CCE is addressed to itself, and determines the CCE with a normal result as the CCE addressed to itself. The above process by the UE is called the blind decoding, and such a blind decoding is described for example in
Patent Literature 1. - (MTC)
- On the other hand, debates on MTC (Machine Type Communications) are also in progress in the 3GPP. The MTC is generally synonymous to M2M (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.
- For example, as a medical application of the MTC, a case may be assumed in which an MTC terminal collects electrocardiogram information of a human, and 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 assumed in which a vending machine is caused to function as an MTC terminal, and a server causes the vending machine under management to report sales once every certain cycle (for example, every 30 days).
- Such an MTC terminal by way of example has the following features in general, however, not every MTC terminal needs to have all of the following features, and which of the features is to be endowed depends on applications.
-
- Scarce needs to move (Low Mobility)
- Transmission of small data (Online Small Data Transmission)
- Very low power consumption (Extra Low Power Consumption)
- Handled by grouping respective MTCs (Group-based MTC Features)
- Patent Literature 1: JP 2009-296589A CL SUMMARY OF INVENTION
- However, due to the introduction of the aforementioned MTCs, increases are expected in a number of terminals existing within each cell, a number of terminals a base station is to contain in an Active mode, and a number of terminals for the base station to simultaneously control in the PDCCH. Further, the CCE included in the PDCCH also increases accompanying the increase in the number of terminals simultaneously controlled in the PDCCH.
- As a result, load of the blind decoding in the UE increases due to a range requiring the blind decoding by the UE (including the MTC terminal) being broader. Especially, there are cases in which the extra-low power consumption is required in the MTC terminal, so the increase in the load of the blind decoding is problematic.
- The invention has been created in view of the above problem, and an aim of the invention is to provide a novel and improved base station, method for radio communication, program, radio communication system, and radio terminal capable of suppressing the load of the blind decoding in the radio terminal.
- According to an embodiment of the present disclosure, there is provided a base station including a control signal generating section that generates a control signal which includes resource information identified by a group identifier assigned to a plurality of radio terminals, and a transmitter section that transmits the control signal generated by the control signal generating section.
- An uplink group identifier and a downlink group identifier may be assigned to the plurality of radio terminals, and the control signal generating section may generate the control signal in a manner that uplink resource information is identified by the uplink group identifier and downlink resource information is identified by the downlink group identifier.
- The downlink resource information may be information indicating a resource for the plurality of radio terminals to perform simultaneous reception.
- The uplink resource information may be information indicating a resource that is to be a reference for each of the plurality of radio terminals to decide a relative position of a transmitter resource.
- The control signal generating section may dispose the resource information identified by a same group identifier in a predetermined frequency region in a control region for transmitting the control signal.
- The control signal generating section may add a check bit obtained by masking the resource information with the group identifier to the resource information.
- According to another embodiment of the present disclosure, there is provided a method for radio communication, the method including the steps of generating a control signal including resource information identified by a group identifier assigned to a plurality of radio terminals, and transmitting the control signal.
- According to another embodiment of the present disclosure, there is provided a program for causing a computer to function as a control signal generating section that generates a control signal including resource information identified by a group identifier assigned to a plurality of radio terminals, and a transmitter section that transmits the control signal generated by the control signal generating section.
- According to another embodiment of the present disclosure, there is provided a radio communication system including a plurality of radio terminals, and a base station that includes a control signal generating section that generates a control signal including resource information identified by a group identifier assigned to the plurality of radio terminals, and a transmitter section that transmits the control signal generated by the control signal generating section.
- According to another embodiment of the present disclosure, there is provided a radio terminal including a receiver section that receives a control signal from a base station, and an acquiring section that acquires resource information identified by a group identifier assigned to a plurality of radio terminals including the radio terminal from the control signal received by the receiver section.
- The acquiring section may acquire information identified by a terminal identifier assigned to the radio terminal from the control signal in a case of determining that the group identifier is not used by the base station.
- According to another embodiment of the present disclosure, there is provided a method for radio communication performed by a radio terminal, the method including the steps of receiving a control signal from a base station, and acquiring resource information identified by a group identifier assigned to a plurality of radio terminals including the radio terminal from the control signal.
- According to another embodiment of the present disclosure, there is provided a program for causing a computer to function as a radio terminal that includes a receiver section that receives a control signal from a base station, and an acquiring section that acquires resource information identified by a group identifier assigned to a plurality of radio terminals including the radio terminal from the control signal received by the receiver section.
- According to the invention as described above, the load of the blind decoding in the radio terminal can be suppressed.
-
FIG. 1 is an explanatory diagram showing an example of a configuration of a radio communication system. -
FIG. 2 is an explanatory diagram showing a 4G frame format. -
FIG. 3A is an explanatory diagram showing an example of using one Ofdm symbol in a transmission of a PDCCH. -
FIG. 3B is an explanatory diagram showing an example of using two Ofdm symbols in the transmission of the PDCCH. -
FIG. 3C is an explanatory diagram showing an example of using three Ofdm symbols in the transmission of the PDCCH. -
FIG. 4 is an explanatory diagram showing a resource block. -
FIG. 5 is an explanatory diagram showing a specific example of a CCE. -
FIG. 6 is an explanatory diagram showing blind decoding. -
FIG. 7 is an explanatory diagram showing the blind decoding. -
FIG. 8 is a sequence diagram showing an example of a method of assigning C-RNTI and MTC-GP_RNTI. -
FIG. 9 is an explanatory diagram showing a configuration of a base station of a first embodiment of the invention. -
FIG. 10 is an explanatory diagram showing a dispositional relationship of a CCE, a second search space, and an allotted resource. -
FIG. 11 is an explanatory diagram showing a configuration of an MTC terminal of the first embodiment. -
FIG. 12 is a sequence diagram showing an operation of the radio communication system of the first embodiment of the invention. -
FIG. 13 is a sequence diagram showing an example of a method of changing an RNTI used for the blind decoding. -
FIG. 14 is an explanatory diagram showing an example of disposition of the second search space for a certain MTC group. -
FIG. 15 is an explanatory diagram showing an example of disposition of the CCE for each MTC group. -
FIG. 16 is an explanatory diagram showing a specific example of an MTC group to which MTC terminals belong. -
FIG. 17 is an explanatory diagram corresponding to a fourth embodiment. -
FIG. 18 is an explanatory diagram showing a relationship of a reference resource block and an uplink resource block of each MTC terminal. -
FIG. 19 is an explanatory diagram showing a modification of the relationship of the reference resource block and the uplink resource block of each MTC terminal. -
FIG. 20 is an explanatory diagram showing an operation of a radio communication system of a fifth embodiment. - Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the appended drawings. Note that, in this specification and the drawings, elements that have substantially the same function and structure are denoted with the same reference signs, and repeated explanation is omitted.
- Further, in the description and the drawings, there may also be cases in which a plurality of constituent features having substantially the same functional configuration is distinguished by adding different alphabets after the same reference sign. For example, the plurality of constituent features having substantially the same functional configuration may be distinguished as
MTC terminals MTC terminals MTC terminal 20. - Further, the “mode to carry out the invention” will be described in accordance with the order in the below appendix.
- 1. Overview of Radio Communication System
- 1-1. Overview of radio communication system
- 1-2. Configuration of frame
- 1-3. Configuration of PDCCH
- 1-4. Blind decoding
- 2. Description of Respective Embodiments
- 2-1. First embodiment (Base station of first embodiment) (MTC terminal of first embodiment) (Operation of first embodiment) (Supplementation of first embodiment)
- 2-2. Second embodiment
- 2-3. Third embodiment
- 2-4. Fourth embodiment
- 2-5. Fifth embodiment
- b 2-6. Sixth embodiment
- 2-7. Seventh embodiment
- 3. Conclusion
- <1. Overview of Radio Communication System>
- Currently, standardization of a 4G radio communication system is in progress in 3GPP. 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.
- [1-1. Configuration of radio communication system]
-
FIG. 1 is an explanatory diagram showing an example of a configuration of aradio communication system 1. As shown inFIG. 1 , theradio communication system 1 includes abase station 10, a core network including an MME (Mobility Management Entity) 12, an S-GW (Serving Gateway) 14, and a PDN (Packet Data Network)-GW 16,MTC terminals 20, and anMTC server 30. - Embodiments of the invention can be adapted to radio communication devices such as the
base station 10 and theMTC terminals 20 shown inFIG. 1 . Notably, thebase station 10 may for example be an eNodeB, a relay node, or a Home eNodeB that is a compact base station for home use. Further, theMTC terminals 20 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. - The
base station 10 is a radio base station that communicates with theMTC terminals 20. Although only onebase station 10 is shown inFIG. 1 , a large number ofbase stations 10 are connected to the core network in reality. Further, although depiction inFIG. 1 is omitted, thebase station 10 communicates also with other user equipments such as a non-MTC terminal. - The
MME 12 is a device that performs controls of settings, opening, and hand-over of a data communication session. TheMME 12 is connected to thebase station 10 via an interface called X2. - The S-
GW 14 is a device that performs routing and transfer of user data. The PDN-GW 16 functions as a connecting node with an IP service network, and transfers the user data to and from the IP service network. - The
MTC terminals 20 are radio terminals specialized for MTC, which is a communication between machines and is not used directly by a human, which is under discussion in the 3GPP. TheMTC terminals 20 perform radio communication in accordance with an application with thebase station 10. Further, theMTC terminals 20 perform bidirectional communication with theMTC server 30 via the core network. - For example, as a medical application of the MTC, a case may be assumed 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 assumed in which a vending machine is caused to function as theMTC terminal 20, and theMTC server 30 causes the vending machine under management to report sales once every certain cycle (for example, every 30 days). - Such an
MTC terminal 20 by way of example has the following features in general, however, not everyMTC terminal 20 needs to have all of the following features, and which of the features is to be assigned depends on applications. - Scarce needs to move (Low Mobility)
- Transmission of small data (Online Small Data Transmission)
- Very low power consumption (Extra Low Power Consumption)
- Handled by grouping respective MTCs (Group-based MTC Features)
- [1-2. Configuration of frame]
- Although details of the
aforementioned base station 10 andMTC 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 hereinbelow can be applied to the communication between thebase station 10 and theMTC terminals 20. -
FIG. 2 is an explanatory diagram showing a 4G frame format. As shown inFIG. 2 , a 10 ms radio frame is configured of ten 1 ms sub frames #0 to #9. Further, each 1 ms sub frame is configured of two 0.5 ms slots. Further, each 0.5 ms slot is configured of seven Ofdm symbols. - Notably, the Ofdm symbol is a unit used in a communication scheme of an OFDM (Orthogonal Frequency Division Multiplexing) modulation system, and is a unit by which data processed in one FFT (Fast Fourier Transform) is outputted.
- At a head of each 1 ms sub frame shown in
FIG. 2 , a control signal called a PDCCH (Phy Downlink Control Channel) is added. As shown inFIG. 3A toFIG. 3C , one Ofdm symbol to three Ofdm symbols at the head of the sub frame are used for a transmission of the PDCCH. That is, there are cases in which one Ofdm symbol is used for the PDCCH transmission, and there also are cases in which three Ofdm symbols are used for the PDCCH transmission. - 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 PDSCH (Phy Downlink Shared Channel) or a PUSCH (Phy Uplink Shared Channel) is called a data region.
- [1-3. Configuration of PDCCH]
- Next, control information included in the PDCCH will be described.
- Although various types of control information are included in the PDCCH, the following two pieces of control information are primarily included.
- (1) Assigning information indicating a resource block that the UE is to receive from among the PDSCH (assign)
- (2) Granting information indicating a resource block that the UE is to transmit from among the PUSCH (grant)
- Notably, as shown in
FIG. 4 , a minimum unit of the resource block is twelve subcarriers x seven Ofdm symbols. Further, other than the resource information for example of assign, grant, and the like, the PDCCH further includes power control information, paging indexes, system information and the like. - [1-4. Blind Decoding]
- The resource information such as assign and grant as above are information for each UE. Due to this, the eNodeB transmits the PDCCH so that each UE can extract the resource information addressed to itself, and each UE extracts the resource information addressed to itself from the PDCCH by a process called blind decoding. Hereinbelow, this feature will be described in detail.
- In the PDCCH, the minimum unit of the control information for each UE is called CCE (Control Channel Element). The eNodeB includes the resource information for each UE, and generates CCEs identified by a C-RNTI (Cell Radio Network Temporary Identify) that is an identifier of each UE. Hereinbelow, specific examples of the CCE will be described with reference to
FIG. 5 . -
FIG. 5 is an explanatory diagram showing a specific example of the CCE. As shown inFIG. 5 , the CCE includes target information such as the resource information, as well as a check bit that is obtained by a CRC (Cyclic Redundancy Check) by masking the resource information with the C-RNTI (Cell Radio Network Temporary Identify). Here, the masking may be an exclusive disjunction calculation (XOR) of the resource information and the C-RNTI, or may be a serial coupling of the resource information and the C-RNTI. - When the PDCCH including the aforementioned plurality of CCEs is received, the UE extracts the CCE identified by its own C-RNTI by the blind decoding. Hereinbelow, a more specific description will be given with reference to
FIG. 6 andFIG. 7 . -
FIG. 6 andFIG. 7 are explanatory diagrams showing the blind decoding. As shown inFIG. 6 , as the blind decoding, the UE performs CRC check by demasking each CCE with its own C-RNTI. Further, the UE performs the blind decoding on each CCE in an order shown inFIG. 7 . That is, the UE performs the CRC check of each CCE on an assumption that each CCE is addressed to itself, and determines the CCE with a normal result as the CCE addressed to itself. - (CCE Aggregation)
- Notably, in connection to the aforementioned CCEs, there is a concept called CCE aggregation. The CCE aggregation is a mode in which CCEs are transmitted at an amount that is one, two, four, or eight times the typical unit of the CCE.
- For example, in a cell with a large cell radius, when an SN (signal to noise ratio) of a UE can be predicted to be small, the CCEs are transmitted by being repeated eight times. In this case, the check bit by the CRC is added to the result of the eight times of repetition. Accordingly, the UE performs the blind decoding by taking into account a possibility that the CCE aggregation has been performed.
- Further, other than the C-RNTI, RNTIs such as a P-RNTI for acquiring information for paging and an SI-RNTI for acquiring system information exist. Accordingly, the UE performs the blind decoding by assuming by which of the RNTIs each of the CCEs is to be identified.
- (Particulars of Achieving the Embodiments of the Invention)
- Incidentally, in the 4G radio communication system, due to the introduction of the aforementioned MTC terminals, increases are expected in a number of terminals existing within each cell, a number of terminals the base station is to contain in an Active mode, and a number of terminals for the
base station 10 to simultaneously control in the PDCCH. Further, the CCE included in the PDCCH also increases accompanying the increase in the number of terminals simultaneously controlled in the PDCCH. - As a result, load of the blind decoding in the UE increases due to a range requiring the blind decoding by the UE (including the MTC terminal) being broader. Especially, there are cases in which the extra-low power consumption is required in the MTC terminal, so the increase in the load of the blind decoding is problematic.
- Thus, the embodiments of the invention have been created with the above circumstance as a point of concern. According to the embodiments of the invention, load of the blind decoding in the
MTC terminal 20 can be suppressed. Hereinbelow, such embodiments of the invention will be described in detail. - <2. Description of Respective Embodiments>
- As described in detail in “2-1. First embodiment” to “2-7. Seventh embodiment” by way of example, the invention can be implemented in various manners. Further, each embodiment is implemented by using an MTC-GP_RNTI which is an identifier of an MTC group assigned to the
MTC terminal 20. Thus, prior to the detailed description of the respective embodiments, a method of assigning the MTC-GP_RNTI to eachMTC terminal 20 will be described. - (Assigning MTC-GP_RNTI)
-
FIG. 8 is a sequence diagram showing an example of a method of assigning C-RNTI and MTC-GP_RNTI. As shown inFIG. 8 , firstly, in a random access procedure formed ofStep 1 toStep 4, the C-RNTIs are assigned to eachMTC terminal 20. - More specifically described, the
MTC terminal 20 transmits a preamble to a random access window in a radio frame (Step 1). In successfully receiving the preamble from theMTC terminal 20, thebase station 10 transmits a random access response to the MTC terminal 20 (Step 2). Thebase station 10 assigns a Temporary C-RNTI to theMTC terminal 20 in this random access response. - Then, when the random access response is received, the
MTC terminal 20 transmits an L2/L3 message to the base station 10 (Step 3). In connection to the above, theMTC terminal 20 determines that a random access had been successful by receiving a contention resolution message transmitted from the base station 10 (Step 4), and begins using the Temporary C-RNTI assigned inStep 2 as the C-RNTI. - Thereafter, an MTC category setting procedure formed of
Step 5 andStep 6 is performed. More specifically described, since theMTC terminal 20 is set with information of an MTC category indicating whether theMTC terminal 20 itself is an MTC terminal or not, theMTC terminal 20 is aware that itself is an MTC terminal. Due to this, theMTC terminal 20 notifies thebase station 10 of the MTC category (Step 5), and receives a notification confirming signal from the base station 10 (Step 6). Notably, the MTC category may include information indicating a capacity of theMTC terminal 20, such as whether theMTC terminal 20 is compliant with a long sleep mode for over one month or not. - Further, in an MTC-GP_RNTI setting procedure formed of
Step 7 andStep 8, the MTC-GP_RNTI is assigned to theMTC terminal 20. More specifically described, theMTC terminal 20 performs an MTC group setting request to the base station 10 (Step 7). Thebase station 10 transfers the aforementioned setting request to theMME 12 together with a terminal ID of the MTC terminal 20 (a unique number described in an SIM, and is different from the RNTI). - The
MME 12 is a device that handles the unique information of the terminals, receives correspondence information of an MTC group and the terminal IDs of the terminals that are granted to enter the MTC group from theMTC server 30, and retains the correspondence information. TheMME 12 determines whether anMTC terminal 20 having the terminal ID transferred from thebase station 10 is allowed to enter the MTC group or not based on the correspondence information, and if theMTC terminal 20 is allowed to enter, theMME 12 transmits an MTC group setting confirming signal to thebase station 10. - Subsequently, the
base station 10 transmits the MTC-GP_RNTI to theMTC terminal 20 together with the MTC group setting confirming signal (Step 8). Then, theMTC terminal 20 becomes capable of using the MTC-GP_RNTI by receiving the MTC group setting confirming signal and the MTC-GP_RNTI from thebase station 10. - The method of assigning the MTC-GP_RNTI is described above, however, the method of assigning the MTC-GP_RNTI is not limited to the above example. For example, information such as an AC (Access Class) that is predeterminedly set in the
MTC terminal 20 may be used as the MTC-GP_RNTI, and the MTC-GP_RNTI may be assigned to theMTC terminal 20 by a human operation. - [2-1. First embodiment]
- Next, the first embodiment of the invention will be described with reference to
FIG. 9 toFIG. 13 . - (Base Station of First Embodiment)
-
FIG. 9 is an explanatory diagram showing a configuration of abase station 10 of the first embodiment of the invention. As shown inFIG. 9 , thebase station 10 of the first embodiment includes anantenna 104, aradio processing section 108, astorage section 112, ascheduler 116, a controlsignal generating section 120, aCRC circuit 124, and adata mapping section 128. - The
antenna 104 functions as a transmitter section that transmits a transmitter signal such as a PDCCH (control signal) and a PDSCH (data signal) supplied from theradio processing section 108 as a radio signal, and as a receiver section that converts the radio signal transmitted from a radio communication device such as anMTC terminal 20 into an electric receiver signal, and supplies the receiver signal to theradio processing section 108. Notably, inFIG. 9 , although an example in which thebase station 10 includes one antenna is shown, thebase station 10 may include a plurality of antennas. In this case, thebase station 10 is capable of realizing an MIMO (Multiple Input, Multiple Output) communication, a diversity communication and the like. - The
radio processing section 108 performs radio processes for transmission such as modulation, DA conversion, filtering, amplification, and up-conversion of the transmitter signal such as the PDCCH supplied from the controlsignal generating section 120, the PDSCH supplied from the data mapping section, and the like. - Further, the
radio processing section 108 performs radio processes for reception such as down-conversion, filtering, DA conversion, and demodulation of the receiver signal supplied from theantenna 104. - The
storage section 112 stores the MTC-GP_RNTIs, the C-RNTIs and the like that are assigned to therespective MTC terminals 20. Further, although depiction is omitted inFIG. 9 , thestorage section 112 also stores other RNTIs such as SI-RNTIs, P-RNTIs, and RA-RNTIs. - The
scheduler 116 allots a resource to eachMTC terminal 20 for data communication. That is, thescheduler 116 allots resource blocks among the PDSCH that therespective MTC terminals 20 are to receive, and resource blocks among the PUSCH that therespective MTC terminals 20 are to transmit. - The control
signal generating section 120 generates a PDCCH formed of a plurality of CCEs. To describe in further detail, the controlsignal generating section 120 generates a CCE including information indicating a second search space arranged within data region (reference information) and a check bit obtained by theCRC circuit 124 by masking the aforesaid information by the MTC-GP_RNTI. Here, the masking may be an exclusive disjunction calculation (XOR) of the information indicating the second search space and the MTC-GP_RNTI, or may be a serial coupling of the information indicating the second search space and the C-RNTI. According to the above configuration, anMTC terminal 20 within an MTC group to which the MTC-GP_RNTI is assigned can be designated as a destination of the information indicating the second search space. - Notably, although an example in which the check bit corresponding to the information indicating the second search space is added to designate the destination of the CCE is described above, a method of designating the destination of the CCE is not limited to the above example. For example, the control
signal generating section 120 may designate the designation of the CCE simply by attaching the MTC-GP_RNTI to the information indicating the second search space. - Further, the control
signal generating section 120 generates information for mapping in the second search space, and supplies the same to thedata mapping section 128 together with information indicating a position of the second search space. Here, the information for mapping in the second search space is the resource information for therespective MTC terminals 20 within the MTC group to which the MTC-GP_RNTI is assigned. Further, a check bit obtained by theCRC circuit 124 by masking the aforesaid information with the C-RNTIs of therespective MTC terminals 20 is added to the resource information for therespective MTC terminals 20. - The data mapping section 128 (data signal generating section) maps user data for each
MTC terminal 20 supplied from an upper layer in the resource block allotted by thescheduler 116 among the PDSCH that therespective MTC terminals 20 are to receive. Further, thedata mapping section 128 maps the resource information of therespective MTC terminals 20 supplied from the controlsignal generating section 120 in the second search space. Hereinbelow, a disposition relationship of the CCE, the second search space, the allotted resource and the like will be described more specifically with reference toFIG. 10 . -
FIG. 10 is an explanatory diagram showing the disposition relationship of the CCE, the second search space, and the allotted resource. In the example shown inFIG. 10 , aCCE # 1 describes information indicating a position of a secondsearch space # 1 for an MTC group having an MTC-GP_RNTI corresponding to a check bit added to theCCE # 1. - Then, among a plurality of resource information included in the second
search space # 1, for example,resource information # 1 indicates aresource block # 1 for theMTC terminal 20 having a C-RNTI corresponding to a check bit added to theresource information # 1. Further, theresource information # 2 indicates aresource block # 2 for theMTC terminal 20 having a C-RNTI corresponding to a check bit added to theresource information # 2. - Similarly, a
CCE # 2 shown inFIG. 10 describes information indicating a position of a secondsearch space # 2 for an MTC group having an MTC-GP_RNTI corresponding to a check bit added to theCCE # 2. Further, of a plurality of resource information included in the secondsearch space # 2, for example,resource information # 3 indicates aresource block # 3 for theMTC terminal 20 having a C-RNTI corresponding to a check bit added to theresource information # 3. - Notably, the CCE and the second search space may be disposed in the same sub frame as with the
CCE # 1 and the secondsearch space # 1, or may be disposed in different sub frames as with theCCE # 2 and the secondsearch space # 2. Such a relationship of the CCE and the second search space may fixedly be set by signaling in advance, or may be designated by the CCE. - Further, since processing cannot be performed timely if the resource blocks indicated by the respective resource information included in the second search space are in the same sub frame as the second search space, the resource blocks are disposed in a sub frame that is after the sub frame of the second search space, such as with the
resource block # 1 and theresource block # 2. Such a relationship of the second search space and the allotted resource blocks of therespective MTC terminals 20 may fixedly be set by signaling in advance, or may be designated by the second search space. - (MTC Terminal of First Embodiment)
- Hereabove, the configuration of the
base station 10 of the first embodiment of the invention was described. Now, a configuration of theMTC terminal 20 of the first embodiment of the invention will be described. -
FIG. 11 is an explanatory diagram showing the configuration of theMTC terminal 20 of the first embodiment. As shown inFIG. 11 , theMTC terminal 20 of the first embodiment includes anantenna 204, aradio processing section 208, astorage section 212, ablind decoding section 220, and aCRC circuit 224. - The
antenna 204 functions as a transmitter section that transmits a transmitter signal such as a PUSCH(data signal) supplied from theradio processing section 208 as a radio signal, and as a receiver section that converts the radio signal such as the PDCCH and the PDSCH transmitted from abase station 10 into an electric receiver signal, and supplies the receiver signal to theradio processing section 208. Notably, inFIG. 11 , although an example in which theMTC terminal 20 includes one antenna is shown, theMTC terminal 20 may include a plurality of antennas. In this case, theMTC terminal 20 is capable of realizing an MIMO (Multiple Input, Multiple Output) communication, a diversity communication and the like. - The
radio processing section 208 performs radio processes for transmission such as modulation, DA conversion, filtering, amplification, and up-conversion of user data supplied from an upper layer. Further, theradio processing section 208 performs radio processes for reception such as down-conversion, filtering, DA conversion, and demodulation of the receiver signal supplied from theantenna 104. - The
storage section 212 stores for example the MTC-GP RNTIs, the C-RNTIs and the like that are assigned from thebase station 10. Further, although depiction is omitted inFIG. 11 , thestorage section 212 also stores other RNTIs such as SI-RNTI, P-RNTI, and RA-RNTI. - When the PDCCH is supplied from the
radio processing section 208, the blind decoding section 220 (acquiring section) extracts the CCE identified by the MTC-GP_RNTI assigned to theMTC terminal 20 by the blind decoding. More specifically described, theblind decoding section 220 operates in cooperation with theCRC circuit 224 to perform CRC check by demasking each CCE by the MTC-GP_RNTI assigned to theMTC terminal 20. Then, theblind decoding section 220 extracts the CCE with a normal result, and specifies the second search space based on the information described in the CCE. For example, theblind decoding section 220 extracts theCCE # 1 shown inFIG. 10 from the PDCCH, and specifies the secondsearch space # 1 based on the information described in theCCE # 1. - Further, when the PDSCH is supplied from the
radio processing section 208, theblind decoding section 220 acquires the resource information addressed to itself by performing the blind decoding using the C-RNTI on the second search space specified from the CCE. More specifically, theblind decoding section 220 operates in cooperation with theCRC circuit 224 to perform CRC check by demasking each resource information in the second search space using the C-RNTI. Then, theblind decoding section 220 acquires the resource information with a normal result as the resource information addressed to itself. Thereafter, theradio processing section 208 performs the transmission process or the reception process in the resource block indicated by the resource information. For example, theblind decoding section 220 acquires theresource information # 1 in the secondsearch space # 1 shown inFIG. 10 as the resource information addressed to itself. Thereafter, theradio processing section 208 performs the reception process in theresource block # 1 indicated by theresource information # 1. - As described above, according to the first embodiment of the invention, by mapping the resource information (assign, grant) for each
MTC terminal 20 in the PDSCH, the resource information for a large number ofMTC terminals 20 can be contained. Further, since a number of the CCEs in the PDCCH can be suppressed, the search space in which theMTC terminal 20 performs the blind decoding can be reduced. As a result, load related to the blind decoding in theMTC terminal 20 can be reduced. Notably, although an example in which the resource information for therespective MTC terminals 20 are mapped in the second search space was described above, the first embodiment is not limited to this example. For example, communication controlling information for eachMTC terminal 20 such as transmission power and transmission rate, and other various types of information for eachMTC terminal 20 may be mapped in the second search space. - (Operation of First Embodiment)
- Hereabove, the configuration of the
MTC terminal 20 of the first embodiment of the invention was described. Next, an operation of theradio communication system 1 of the first embodiment of the invention will be described. -
FIG. 12 is a sequence diagram showing the operation of theradio communication system 1 of the first embodiment of the invention. Thebase station 10 firstly decides a second search space for one MTC group (S310). Then, the controlsignal generating section 120 of thebase station 10 describes information indicating the decided second search space in the CCE in the PDCCH in a state capable of being identified by MTC-GP_RNTI assigned to the MTC group (S320). More specifically, the controlsignal generating section 120 adds a check bit obtained by theCRC circuit 124 by masking the information indicating the second search space with the MTC-GP_RNTI to the CCEs. - Further, the
data mapping section 128 of thebase station 10 maps the resource information for eachMTC terminal 20 belonging to the MTC group in the second search space of the PDSCH in a state capable of being identified by C-RNTI assigned to each MTC terminal 20 (S330). Thereafter, thebase station 10 transmits the PDCCH and the PDSCH (S340). - Then, when the
MTC terminal 20 receives the PDCCH from thebase station 10, theblind decoding section 220 of theMTC terminal 20 performs the blind decoding on the respective CCEs in the PDCCH using the MTC-GP_RNTI assigned to itself (S350), and specifies the second search space for the MTC group including the terminal itself (S360). - Further, when the
MTC terminal 20 receives the PDSCH from thebase station 10, theblind decoding section 220 of theMTC terminal 20 performs the blind decoding on the second search space in the PDSCH using the C-RNTI (S370), and acquires the resource information for the terminal itself (S380). Thereafter, theMTC terminal 20 performs the reception process or the transmission process in the resource block indicated by the acquired resource information. - (Supplementation of First Embodiment)
- As described above, the
base station 10 of the first embodiment of the invention transmits the PDCCH by describing the information indicating the second search space in the CCEs in the state capable of being identified by the MTC-GP_RNTI. However, a case in which thebase station 10 transmits the PDCCH by describing the resource information for theMTC terminal 20 in the CCEs in a state capable of being identified by the C-RNTI of theMTC terminal 20 may also be possible. - Thus, the
MTC terminal 20 may perform the blind decoding of the PDCCH by using both the MTC-GP_RNTI and the C-RNTI. Even in the case of performing the blind decoding of the PDCCH by using both the MTC-GP_RNTI and the C-RNTI, since the search space is made small according to the first embodiment of the invention, load on theMTC terminal 20 can be suppressed sufficiently. - Alternatively, in a case where it is determined that the
base station 10 cannot handle the MTC-GP_RNTI, theMTC terminal 20 may perform the blind decoding by using only the C-RNTI. Notably, as the case in which thebase station 10 cannot handle the MTC-GP RNTI, a case in which theMTC terminal 20 is connected to anew base station 10 by a hand-over, or a case in which thebase station 10 does not have a capability to handle the MTC-GP_RNTI is expected. - Alternatively, as will be described with reference to
FIG. 13 , theMTC terminal 20 may change the RNTI to be used in the blind decoding by requesting a setting change to thebase station 10. -
FIG. 13 is a sequence diagram showing an example of a method of changing the RNTI used for the blind decoding. As shown inFIG. 13 , in the case where theMTC terminal 20 performs the blind decoding of the PDCCH by using both the MTC-GP_RNTI and the C-RNTI, a setting request of MTC-GP_Only_Mod can be transmitted to the base station 10 (S410). - When the setting request is received, the
base station 10 sets the MTC-GP_Only_Mod that describes the information indicating at least the second search space for the MTC group to which theMTC terminal 20 belongs in the CCE in a state capable of being identified by the MTC-GP_RNTI. Then, thebase station 10 transmits a setting confirming signal of the MTC-GP_Only_Mod to the MTC terminal 20 (S420). Notably, thebase station 10 may transmit the setting confirming signal of the MTC-GP_Only_Mod to all of the MTC terminals belonging to the MTC group. - After receiving the setting confirming signal of the MTC-GP_Only_Mod, the
MTC terminal 20 performs the blind decoding by using only the MTC-GP_RNTI. - Thereafter, when the
MTC terminal 20 transmits a release request of the MTC-GP_Only_Mod to thebase station 10, (S430), thebase station 10 releases the setting of the MTC-GP_Only_Mod, and transmits a release confirming signal of the MTC-GP_Only_Mod to the MTC terminal 20 (S440). After having received the release confirming signal of the MTC-GP_Only_Mod, theMTC terminal 20 again performs the blind decoding of the PDCCH using both the MTC-GP_RNTI and the C-RNTI. - [2-2. Second Embodiment]
- Hereabove, the first embodiment of the invention was described. Now, a second embodiment of the invention will be described. Notably, since the second embodiment to the seventh embodiment described below have a large number of portions in common with the first embodiment, detailed descriptions for the portions in common with the first embodiment will be omitted. Further, the second embodiment to the seventh embodiment will be described by reusing the configurational diagram of the
base station 10 shown inFIG. 9 and the configurational diagram of theMTC terminal 20 shown inFIG. 11 . -
FIG. 14 is an explanatory diagram showing an example of disposition of the second search space for a certain MTC group. As shown inFIG. 14 , abase station 10 may dispose secondsearch spaces # 1 to #3 at a same position that oneCCE # 1 indicates over a plurality of sub frames. - In this case, an
MTC terminal 20 needs to know over how many sub frames the second search spaces are to be disposed at the same position. Due to this, thebase station 10 may notify a number of the sub frames in CCE, or may notify the number of the sub frames to theMTC terminal 20 in advance. - According to this second embodiment, since the number of the CCEs in PDCCH can further be reduced, load related to blind decoding on the
MTC terminal 20 can further be reduced. - [2-3. Third Embodiment]
- As described with reference to
FIG. 7 , typically, after searching CCE in PDCCH in a frequency direction, anMTC terminal 20 searches the following Ofdm symbol again in the frequency direction. Due to this, in an LTE, a search in the frequency direction with a minimum width of 5 MHz and a maximum width of 20 MHz is required. - However, from viewpoints that the
MTC terminal 20 in some cases is required to have an extra low power consumption, and of an operation efficiency of a digital circuit, it is effective to make the search width in the frequency direction be 5 MHz or less, for example, 1 MHz or less. - Thus, the
base station 10 of the third embodiment disposes the CCEs for the same MTC group in a predetermined sub carrier. Hereinbelow, specific descriptions will be given with reference toFIG. 15 . -
FIG. 15 is an explanatory diagram showing an example of disposition of the CCEs for each MTC group. As shown inFIG. 15 , thebase station 10 of the third embodiment for example disposes CCE for anMTC terminal 20 belonging to anMTC group 1 in a sub carrier x, and disposes CCE for anMTC terminal 20 belonging to anMTC group 2 in a sub carrier y. Notably, thebase station 10 may notify theMTC terminals 20 in advance of information indicating which sub carrier the CCE for each MTC group is going to be disposed in. - According to the above configuration, the
MTC terminal 20 belonging to theMTC group 1 can simply perform the blind decoding only on the sub carrier x in a time direction, and theMTC terminal 20 belonging to theMTC group 2 can simply perform the blind decoding only on the sub carrier y in the time direction. Thus, according to the third embodiment, load related to the blind decoding in theMTC terminal 20 can significantly be reduced. - [2-4. Fourth Embodiment]
- In the above embodiment, an example in which the
MTC terminals 20 belong to one MTC group and one MTC-GP_RNTI is assigned was described. On the other hand, a case in which theMTC terminals 20 are grouped separately for uplink and downlink is also expected. The fourth embodiment focuses on this feature, andMTC terminals 20 of the fourth embodiment belong to a plurality of MTC groups, and a plurality of MTC-GP_RNTIs are assigned. Hereinbelow, a specific example will be described with reference toFIG. 16 . -
FIG. 16 is an explanatory diagram showing a specific example of an MTC group to whichMTC terminals 20 belong. As shown inFIG. 16 , theMTC terminals 20 of the fourth embodiment belong to an uplink MTC group and a downlink MTC group. For example, anMTC terminal 20A belongs to adownlink MTC group 1 and anuplink MTC group 1, and anMTC terminal 20B belongs to thedownlink MTC group 1 and anuplink MTC group 3. - Due to this, MTC-DownLink_RNTI that is a downlink group identifier and MTC-UpLink_RNTI that is an uplink group identifier are assigned to each
MTC terminal 20. - In this case, a
base station 10 generates the CCE including information indicating a second search space for the uplink by using the MTC-UpLink_RNTI, and generates the CCE including information indicating a second search space for the downlink by using the MTC-DownLink_RNTI. - For example, in a case of describing the information indicating the second search space for the
uplink MTC group 1 in theCCE # 4 shown inFIG. 17 , thebase station 10 generates theCCE # 4 by using the MTC-UpLink_RNTI assigned to theuplink MTC group 1. Similarly, in a case of describing the information indicating the second search space for thedownlink MTC group 2 in theCCE # 5 shown inFIG. 17 , thebase station 10 generates theCCE # 5 by using the MTC-DownLink_RNTI assigned to thedownlink MTC group 2. - Due to this, the
MTC terminal 20 can extract the CCE for the MTC group to which theMTC terminal 20 belongs by performing blind decoding on each CCE in the PDCCH by using the MTC-DownLink_RNTI and the MTC-UpLink_RNTI. - [2-5. Fifth Embodiment]
- As described above, the first embodiment to the fourth embodiment make the search space in the PDCCH small by using the second search space. With respect to this, the fifth embodiment to the seventh embodiment described below make the search space in the PDCCH small by describing the resource information shared by a plurality of
MTC terminals 20 configuring an MTC group in the CCE. Hereinbelow, the fifth embodiment to the seventh embodiment will orderly be described. - (Sharing Downlink Resource Information)
- As applications of an
MTC terminal 20, applications for reporting accumulated information such as reporting sales performance of a vending machine, reporting used amount of gas or water are primarily expected. In such cases, abase station 10 can use a common command for instructing a plurality ofMTC terminals 20 to report the accumulated information. - Thus, the
base station 10 describes resource information indicating a resource block to which the plurality ofMTC terminals 20 in an MTC group is to perform a reception process in the CCE. Further, thebase station 10 transmits the CCE in a state capable of being identified by MTC-GP_RNTI by adding a check bit based on the MTC-GP RNTI assigned to the MTC group to the CCEs. - Then, the plurality of
MTC terminals 20 in the MTC group performs blind decoding using the MTC-GP_RNTI, and extracts the CCE identified by the MTC-GP_RNTI. Further, the plurality ofMTC terminals 20 in the MTC group simultaneously performs the reception process in the resource block indicated by the resource information described in the extracted CCE. - According to the above configuration, since the resource information to the
respective MTC terminals 20 does not need to be described in different CCEs, the search space in the PDCCH can further be made smaller. - (Sharing Uplink Resource Information)
- In an uplink, if the plurality of
MTC terminals 20 performs a transmission process in the same resource block, uplink data collapses at thebase station 10. Thus, thebase station 10 describes resource information indicating a reference resource block for the uplink of the MTC group in the CCE. Further, thebase station 10 transmits the CCE in a state capable of being identified by MTC-GP_RNTI by adding a check bit based on the MTC-GP_RNTI assigned to the MTC group to the CCEs. - Then, the plurality of
MTC terminals 20 in the MTC group performs blind decoding using the MTC-GP_RNTI, and extracts the CCE identified by the MTC-GP_RNTI. Further, the plurality ofMTC terminals 20 in the MTC group specifies the reference resource block indicated by the resource information described in the extracted CCE, and performs the transmission process in the resource block that is in a positional relationship with the reference resource block as set in advance. Hereinbelow, this feature will be described more specifically with reference toFIG. 18 . -
FIG. 18 is an explanatory diagram showing a relationship of a reference resource block and an uplink resource block of eachMTC terminal 20. As shown inFIG. 18 , for example, resource information indicating aresource block # 1 as the reference resource block of the uplink of aMTC group 1 is described inCCE # 6. - Here, it is assumed that the
MTC group 1 is configured ofMTC terminals 20A to 20D, and a relative position of a resource block to be used for the uplink by eachMTC terminal 20 from the reference resource block is set. In this case, theMTC terminals 20A to 20D specify theresource block # 1 that is the reference resource block, and perform the transmission process by using the resource block that is at the set relative position from the reference resource block. - For example, a case of a setting in which the reference resource block is an origin, and resource blocks that are adjacent in a time direction are used in an order of the
MTC terminals FIG. 18 , theMTC terminal 20A uses theresource block # 1 that is the reference resource block, the MTC terminal 20B uses aresource block # 2 that is adjacent with theresource block # 1 in the time direction. Similarly, theMTC terminal 20C uses aresource block # 3 that is adjacent with theresource block # 2 in the time direction, and theMTC terminal 20D uses aresource block # 4 that is adjacent with theresource block # 3 in the time direction. - As a modification, settings may be made with a reference resource block as an origin to use resource blocks that are adjacent in a frequency direction in an order of
MTC terminals FIG. 19 , theMTC terminal 20A uses aresource block # 1 that is the reference resource block, and the MTC terminal 20B uses theresource block # 5 that is adjacent to theresource block # 1 in the frequency direction. Similarly, theMTC terminal 20C uses theresource block # 6 that is adjacent to theresource block # 5 in the frequency direction, and theMTC terminal 20D uses theresource block # 7 that is adjacent to theresource block # 6 in the frequency direction. - Notably, the
base station 10 may signal the positional relationship of the resource block to which eachMTC terminal 20 is to perform the transmission process and the reference resource block in advance to eachMTC terminal 20. Further, although an example in which the fifth embodiment is implemented by the MTC-GP RNTI was described, the fifth embodiment may be implemented by replacing the MTC-GP_RNTI with the C-RNTI. For example, in a case of not being able to handle the MTC-GP_RNTI, thebase station 10 can allot the same C-RNTI to a plurality ofMTC terminals 20, and the C-RNTI may be used in a similar way as with the above MTC-GP_RNTI. - (Operation of Fifth Embodiment)
- Hereabove, sharing of the resource information in the fifth embodiment was described. Now, an operation of the
radio communication system 1 according to the fifth embodiment will be described with reference toFIG. 20 . -
FIG. 20 is an explanatory diagram showing the operation of theradio communication system 1 of the fifth embodiment. As shown inFIG. 20 , thebase station 10 transmits relative position information indicating the positional relationship of the resource blocks to which theMTC terminals 20 are to perform the transmission to theMTC terminals 20 in advance (S510). - Thereafter, the control
signal generating section 120 of thebase station 10 describes the resource information for eachMTC terminal 20 belonging to the MTC group in a state capable of being identified by the MTC-GP_RNTI assigned to the MTC group to the CCEs in the PDCCH (S520). Specifically, the controlsignal generating section 120 adds the check bit obtained by theCRC circuit 124 by masking the resource information for eachMTC terminal 20 with the MTC-GP_RNTI to the CCEs. Then, thebase station 10 transmits the PDCCH including the CCE in which the resource information for eachMTC terminal 20 is described (S530). - Then, when each
MTC terminal 20 receives the PDCCH from thebase station 10, theblind decoding section 220 of theMTC terminal 20 performs blind decoding on each CCE in the PDCCH by using the MTC-GP_RNTI assigned to itself (S540), and obtains the resource information for the MTC group including itself (S550). - Here, in a case where the obtained resource information indicates a downlink resource block (S560), the
MTC terminal 20 performs the reception process in the resource block indicated by the resource information (S570). - On the other hand, in a case where the obtained resource information indicates an uplink resource block (S560), the
MTC terminal 20 performs the transmission process in the resource block that is in the positional relationship as indicated by the relative position information with the reference resource block indicated by the resource information (S580). - As described above, according to the fifth embodiment, due to no longer being necessary to describe the resource information for each
MTC terminal 20 to the respective CCEs, the search space in the PDCCH can be made small. As a result, load related to the blind decoding in theMTC terminals 20 can be reduced. - [2-6. Sixth Embodiment]
- The sixth embodiment is implemented by adapting the third embodiment described with reference to
FIG. 15 to the fifth embodiment. Specifically, abase station 10 according to the sixth embodiment disposes a CCE including resource information for one MTC group in a predetermined sub carrier. According to the configuration, since anMTC terminal 20 simply needs to perform blind decoding on only the predetermined sub carrier in a time direction, load related to the blind decoding in theMTC terminal 20 can be reduced significantly. - [2-7. Seventh Embodiment]
- The seventh embodiment is implemented by adapting the fourth embodiment described with reference to
FIG. 16 to the fifth embodiment. Specifically, anMTC terminal 20 of the seventh embodiment belongs to an uplink MTC group and a downlink MTC group. Due to this, theMTC terminal 20 is assigned with MTC-DownLink_RNTI that is a group identifier for downlink, and MTC-UpLink_RNTI that is a group identifier for uplink. - In this case, the
base station 10 generates the CCE including the uplink resource information of the MTC group by using the MTC-UpLink_RNTI, and generates the CCE including the downlink resource information by using the MTC-DownLink_RNTI. - Due to this, the
MTC terminal 20 can extract the CCE for the MTC group to which theMTC terminal 20 belongs by performing blind decoding on each CCE in the PDCCH by using the MTC-DownLink_RNTI and the MTC-UpLink_RNTI. - <3. Conclusion>
- As described above, according to the first embodiment to the fourth embodiment of the invention, the resource information for a large number of
MTC terminals 20 can be stored by mapping the resource information (assign, grant) for eachMTC terminal 20 in the second search space in the PDSCH. Further, since a number of the CCEs in the PDCCH can be suppressed, the search space in which theMTC terminal 20 performs the blind decoding can be reduced. As a result, load related to the blind decoding in theMTC terminal 20 can be reduced. - Further, according to the fifth embodiment to the seventh embodiment of the invention, the resource information described in the CCE in the PDCCH can be shared by the plurality of
MTC terminals 20 in the MTC group. Due to this, the resource information for eachMTC terminal 20 no longer needs to be described in separate CCEs, so the search space in the PDCCH can be made small. As a result, load related to the blind decoding in theMTC terminals 20 can be reduced. - Notably, although preferred embodiments of the invention have been described in detail with reference to the attached drawings, the invention is not limited to these examples. A person skilled in the art find various alterations and modifications within the scope of the appended claims, and it should be understood that they will naturally come under the technical scope of the present invention.
- For example, respective steps in the processes by the
base station 10 and theMTC terminal 20 in the description do not necessarily be performed in chronological orders as described in sequence diagrams. For example, the respective steps in the processes by thebase station 10 and theMTC terminal 20 may be performed in orders different from the orders described the in sequence diagrams, or may be performed in parallel. - Further, computer programs for causing hardware such as CPUs, ROMs, and RAMs installed in the
base station 10 and theMTC terminal 20 to exhibit similar functions as the respective configurations of thebase station 10 and theMTC terminal 20 may be produced. Further, storage media storing such computer programs may also be provided. - 10 Base station
- 12 MME
- 14 S-GW
- 16 PDN-GW
- 20 MTC terminal
- 30 MTC server
- 104,204 Antenna
- 108, 208 Radio processing section
- 112, 212 Storage section
- 116 Scheduler
- 120 Control signal generating section
- 124, 224 CRC circuit
- 128 Data mapping section
- 220 Blind decoding section
Claims (13)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-22508 | 2010-10-04 | ||
JP2010-225081 | 2010-10-04 | ||
JP2010225081A JP2012080416A (en) | 2010-10-04 | 2010-10-04 | Base station, wireless communication method, program, wireless communication system and wireless terminal |
PCT/JP2011/068370 WO2012046506A1 (en) | 2010-10-04 | 2011-08-11 | Base station, wireless communication method, program, wireless communication system, and wireless terminal |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2011/068370 A-371-Of-International WO2012046506A1 (en) | 2010-10-04 | 2011-08-11 | Base station, wireless communication method, program, wireless communication system, and wireless terminal |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/002,271 Continuation US10271312B2 (en) | 2010-10-04 | 2016-01-20 | Base station, method for radio communication, radio communication system, and radio terminal |
Publications (2)
Publication Number | Publication Date |
---|---|
US20130150109A1 true US20130150109A1 (en) | 2013-06-13 |
US9271273B2 US9271273B2 (en) | 2016-02-23 |
Family
ID=45927505
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/818,697 Expired - Fee Related US9271273B2 (en) | 2010-10-04 | 2011-08-11 | Base station, method for radio communication, program, radio communication system, and radio terminal |
US15/002,271 Active 2031-10-30 US10271312B2 (en) | 2010-10-04 | 2016-01-20 | Base station, method for radio communication, radio communication system, and radio terminal |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/002,271 Active 2031-10-30 US10271312B2 (en) | 2010-10-04 | 2016-01-20 | Base station, method for radio communication, radio communication system, and radio terminal |
Country Status (7)
Country | Link |
---|---|
US (2) | US9271273B2 (en) |
EP (1) | EP2627143B1 (en) |
JP (1) | JP2012080416A (en) |
CN (1) | CN103141144B (en) |
BR (1) | BR112013007733A2 (en) |
TR (1) | TR201911204T4 (en) |
WO (1) | WO2012046506A1 (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150237649A1 (en) * | 2012-11-20 | 2015-08-20 | Samsung Electronics Co., Ltd. | Method for uplink packet scheduling and device thereof |
WO2015112071A3 (en) * | 2014-01-22 | 2015-09-17 | Telefonaktiebolaget L M Ericsson (Publ) | Handling of different control channel configurations for one or more wireless devices in a radio network |
US20160088651A1 (en) * | 2013-04-18 | 2016-03-24 | Zte Corporation | Method and Device for Sending or Acquiring Grant Signaling |
EP2892263A4 (en) * | 2012-08-29 | 2016-05-25 | Ntt Docomo Inc | Wireless base station and mobile station |
WO2017010634A1 (en) * | 2015-07-10 | 2017-01-19 | 엘지전자 주식회사 | Method and device for transmitting control information in wireless communication system |
US9572154B2 (en) | 2013-01-17 | 2017-02-14 | Sharp Kabushiki Kaisha | Systems and methods for dynamically configuring a flexible subframe |
US9642172B2 (en) | 2012-07-27 | 2017-05-02 | Kyocera Corporation | Mobile communication system, base station, user terminal, and processor |
US9872123B2 (en) | 2012-12-03 | 2018-01-16 | Sony Corporation | Group based PDCCH capability for LTE |
US9883536B2 (en) | 2013-01-18 | 2018-01-30 | Ntt Docomo, Inc. | Radio base station and mobile station |
US10172123B2 (en) * | 2015-02-05 | 2019-01-01 | Electronics And Telecommunications Research Institute | Communication method based on device's property and apparatus for allocating resource by using the method |
WO2019114971A1 (en) * | 2017-12-14 | 2019-06-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Scheduling of a data transmission |
US10680772B2 (en) * | 2013-08-07 | 2020-06-09 | Sun Patent Trust | Base station apparatus, terminal apparatus, transmitting method, and receiving method |
US10945248B2 (en) * | 2015-01-29 | 2021-03-09 | Ntt Docomo, Inc. | User terminal, radio base station and radio communication method |
US11219012B2 (en) | 2014-06-24 | 2022-01-04 | Sun Patent Trust | Terminal, base station, transmission method, and reception method |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2487782B (en) | 2011-02-04 | 2015-05-20 | Sca Ipla Holdings Inc | Telecommunications method and system |
US8848638B2 (en) * | 2011-06-27 | 2014-09-30 | Telefonaktiebolaget L M Ericsson (Publ) | Cellular communication system support for limited bandwidth communication devices |
JP6082288B2 (en) * | 2012-10-16 | 2017-02-15 | シャープ株式会社 | Wireless communication system |
GB2508593B (en) * | 2012-12-03 | 2020-08-26 | Sony Corp | Telecommunications apparatus and methods |
GB2508595B (en) * | 2012-12-03 | 2020-08-26 | Sony Corp | Telecommunications apparatus and methods |
JP6378195B2 (en) * | 2012-12-03 | 2018-08-22 | ソニー株式会社 | Send control information to a terminal with limited bandwidth |
GB2510138A (en) * | 2013-01-24 | 2014-07-30 | Sony Corp | Allocating communications resources within different frequency ranges according to the relative capability of a communications device |
GB2510141A (en) * | 2013-01-24 | 2014-07-30 | Sony Corp | Mobile communications network including reduced capability devices |
GB2510137A (en) * | 2013-01-24 | 2014-07-30 | Sony Corp | Mobile communications network including reduced capability devices |
GB2510140A (en) | 2013-01-24 | 2014-07-30 | Sony Corp | Virtual carrier for reduced capability wireless devices |
JP6040037B2 (en) * | 2013-01-30 | 2016-12-07 | シャープ株式会社 | Wireless communication system |
CN104521286B (en) * | 2013-08-07 | 2020-08-14 | 华为技术有限公司 | Data transmission method, device and system |
WO2015019454A1 (en) * | 2013-08-07 | 2015-02-12 | 富士通株式会社 | Wireless communication system, base station, communication terminal, and wireless communication method |
US11140634B2 (en) * | 2017-03-23 | 2021-10-05 | Apple Inc. | Narrowband internet-of-things (NB-IOT) enhancements |
WO2020172762A1 (en) * | 2019-02-25 | 2020-09-03 | Huawei Technologies Co., Ltd. | Pscell activation with early data-forwarding for dual connectivity based handover |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100054188A1 (en) * | 2007-03-19 | 2010-03-04 | Atsushi Matsumoto | Wireless Communication Base Station Apparatus and Wireless Communication Method |
US20100159938A1 (en) * | 2008-12-19 | 2010-06-24 | Electronics And Telecommunications Research Institute | Control channel managing apparatus, control channel searching apparatus, and control channel allocation method |
US20100260138A1 (en) * | 2009-04-10 | 2010-10-14 | Yong Liu | Signaling For Multi-Dimension Wireless Resource Allocation |
US20110021229A1 (en) * | 2008-03-26 | 2011-01-27 | Koninklijke Philips Electronics N.V. | method for communicating in mobile system |
US20110034197A1 (en) * | 2009-07-03 | 2011-02-10 | Robert Novak | Apparatus and method for signalling active assignments to a group of wireless stations |
US20110317655A1 (en) * | 2009-03-12 | 2011-12-29 | Panasonic Corporation | Radio terminal, radio base station, channel signal forming method, and channel signal receiving method |
US20130315154A1 (en) * | 2007-06-13 | 2013-11-28 | Sparkmotion Inc. | Method and devices for bandwidth allocation in a wireless communications system |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7616610B2 (en) * | 2005-10-04 | 2009-11-10 | Motorola, Inc. | Scheduling in wireless communication systems |
JP2009088577A (en) * | 2006-01-10 | 2009-04-23 | Mitsubishi Electric Corp | Scheduling method and base station device |
GB0600870D0 (en) * | 2006-01-17 | 2006-02-22 | Siemens Ag | A Method Of Scheduling Groups Of Mobile Users |
JP2008244559A (en) * | 2007-03-26 | 2008-10-09 | Sharp Corp | Mobile station device, base station device, radio communication system, control information receiving method, control information transmission method and program |
US9344259B2 (en) * | 2007-06-20 | 2016-05-17 | Google Technology Holdings LLC | Control channel provisioning and signaling |
US8600413B2 (en) * | 2007-10-30 | 2013-12-03 | Qualcomm Incorporated | Control arrangement and method for communicating paging messages in a wireless communication system |
US8929304B2 (en) * | 2008-01-04 | 2015-01-06 | Optis Wireless Technology, Llc | Radio communication base station device, radio communication mobile station device, and control channel allocation method |
US8374109B2 (en) * | 2008-03-27 | 2013-02-12 | Qualcomm Incorporated | Methods of sending control information for users sharing the same resource |
US8326292B2 (en) | 2008-06-03 | 2012-12-04 | Innovative Sonic Limited | Method and apparatus for determining dedicate searching space in physical downlink control channel |
US8441996B2 (en) * | 2009-04-02 | 2013-05-14 | Lg Electronics Inc. | Method and apparatus for monitoring control channel in multiple carrier system |
KR20110038994A (en) * | 2009-10-09 | 2011-04-15 | 삼성전자주식회사 | Method of receiving and transmitting multi-user control channels in wireless communication system with multiple antennas and apparatus thereof |
JP5726189B2 (en) * | 2010-07-21 | 2015-05-27 | パナソニック インテレクチュアル プロパティ コーポレーション オブアメリカPanasonic Intellectual Property Corporation of America | Terminal device, receiving method, and integrated circuit |
EP2437422A1 (en) * | 2010-10-01 | 2012-04-04 | Panasonic Corporation | Search space for uplink and downlink grant in an OFDM-based mobile communication system |
US10638464B2 (en) * | 2011-04-01 | 2020-04-28 | Futurewei Technologies, Inc. | System and method for transmission and reception of control channels in a communications system |
KR101810121B1 (en) * | 2011-05-27 | 2017-12-18 | 애플 인크. | Apparatus and method for performing random access in wireless communication system |
KR101943821B1 (en) * | 2011-06-21 | 2019-01-31 | 한국전자통신연구원 | Methods for transmitting and receiving of control channel in wireless communication systems |
US9264208B2 (en) * | 2011-07-12 | 2016-02-16 | Qualcomm Incorporated | Downlink control with control-less subframes |
US8937916B2 (en) * | 2011-09-26 | 2015-01-20 | Electronics And Telecommunications Research Institute | Resource allocating apparatus and method for machine type communication |
JP6122855B2 (en) * | 2011-09-30 | 2017-04-26 | インターデイジタル パテント ホールディングス インコーポレイテッド | Device communication using reduced channel bandwidth |
US9538502B2 (en) * | 2012-05-01 | 2017-01-03 | Qualcomm Incorporated | Methods and apparatus for managing control and data transmissions for low cost user equipments |
-
2010
- 2010-10-04 JP JP2010225081A patent/JP2012080416A/en active Pending
-
2011
- 2011-08-11 TR TR2019/11204T patent/TR201911204T4/en unknown
- 2011-08-11 WO PCT/JP2011/068370 patent/WO2012046506A1/en active Application Filing
- 2011-08-11 CN CN201180046988.XA patent/CN103141144B/en not_active Expired - Fee Related
- 2011-08-11 BR BR112013007733A patent/BR112013007733A2/en not_active Application Discontinuation
- 2011-08-11 EP EP11830439.3A patent/EP2627143B1/en not_active Not-in-force
- 2011-08-11 US US13/818,697 patent/US9271273B2/en not_active Expired - Fee Related
-
2016
- 2016-01-20 US US15/002,271 patent/US10271312B2/en active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100054188A1 (en) * | 2007-03-19 | 2010-03-04 | Atsushi Matsumoto | Wireless Communication Base Station Apparatus and Wireless Communication Method |
US20130315154A1 (en) * | 2007-06-13 | 2013-11-28 | Sparkmotion Inc. | Method and devices for bandwidth allocation in a wireless communications system |
US20110021229A1 (en) * | 2008-03-26 | 2011-01-27 | Koninklijke Philips Electronics N.V. | method for communicating in mobile system |
US20100159938A1 (en) * | 2008-12-19 | 2010-06-24 | Electronics And Telecommunications Research Institute | Control channel managing apparatus, control channel searching apparatus, and control channel allocation method |
US20110317655A1 (en) * | 2009-03-12 | 2011-12-29 | Panasonic Corporation | Radio terminal, radio base station, channel signal forming method, and channel signal receiving method |
US20100260138A1 (en) * | 2009-04-10 | 2010-10-14 | Yong Liu | Signaling For Multi-Dimension Wireless Resource Allocation |
US20110034197A1 (en) * | 2009-07-03 | 2011-02-10 | Robert Novak | Apparatus and method for signalling active assignments to a group of wireless stations |
Cited By (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9642172B2 (en) | 2012-07-27 | 2017-05-02 | Kyocera Corporation | Mobile communication system, base station, user terminal, and processor |
EP2892263A4 (en) * | 2012-08-29 | 2016-05-25 | Ntt Docomo Inc | Wireless base station and mobile station |
US10805947B2 (en) * | 2012-11-20 | 2020-10-13 | Samsung Electronics Co., Ltd. | Method for uplink packet scheduling and device thereof |
US20150237649A1 (en) * | 2012-11-20 | 2015-08-20 | Samsung Electronics Co., Ltd. | Method for uplink packet scheduling and device thereof |
US10206078B2 (en) | 2012-12-03 | 2019-02-12 | Sony Corporation | Group based PDCCH capability for LTE |
US10659939B2 (en) | 2012-12-03 | 2020-05-19 | Sony Corporation | Telecommunications apparatus and methods |
US9872123B2 (en) | 2012-12-03 | 2018-01-16 | Sony Corporation | Group based PDCCH capability for LTE |
US9572154B2 (en) | 2013-01-17 | 2017-02-14 | Sharp Kabushiki Kaisha | Systems and methods for dynamically configuring a flexible subframe |
US9883536B2 (en) | 2013-01-18 | 2018-01-30 | Ntt Docomo, Inc. | Radio base station and mobile station |
US10021718B2 (en) * | 2013-04-18 | 2018-07-10 | Zte Corporation | Method and device for sending or acquiring grant signaling |
US20160088651A1 (en) * | 2013-04-18 | 2016-03-24 | Zte Corporation | Method and Device for Sending or Acquiring Grant Signaling |
US11218265B2 (en) | 2013-08-07 | 2022-01-04 | Sun Patent Trust | Base station apparatus, terminal apparatus, transmitting method, and receiving method |
US11632213B2 (en) | 2013-08-07 | 2023-04-18 | Sun Patent Trust | Base station apparatus, terminal apparatus, transmitting method, and receiving method |
US10680772B2 (en) * | 2013-08-07 | 2020-06-09 | Sun Patent Trust | Base station apparatus, terminal apparatus, transmitting method, and receiving method |
US9900216B2 (en) | 2014-01-22 | 2018-02-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Handling of different control channel configurations for one or more wireless devices in a radio network |
WO2015112071A3 (en) * | 2014-01-22 | 2015-09-17 | Telefonaktiebolaget L M Ericsson (Publ) | Handling of different control channel configurations for one or more wireless devices in a radio network |
US11838927B2 (en) | 2014-06-24 | 2023-12-05 | Sun Patent Trust | Terminal, base station, transmission method, and reception method |
US11606785B2 (en) | 2014-06-24 | 2023-03-14 | Sun Patent Trust | Terminal, base station, transmission method, and reception method |
US11219012B2 (en) | 2014-06-24 | 2022-01-04 | Sun Patent Trust | Terminal, base station, transmission method, and reception method |
US10945248B2 (en) * | 2015-01-29 | 2021-03-09 | Ntt Docomo, Inc. | User terminal, radio base station and radio communication method |
US10172123B2 (en) * | 2015-02-05 | 2019-01-01 | Electronics And Telecommunications Research Institute | Communication method based on device's property and apparatus for allocating resource by using the method |
WO2017010634A1 (en) * | 2015-07-10 | 2017-01-19 | 엘지전자 주식회사 | Method and device for transmitting control information in wireless communication system |
US10498487B2 (en) | 2015-07-10 | 2019-12-03 | Lg Electronics Inc. | Method and device for transmitting control information in wireless communication system |
US11659542B2 (en) | 2017-12-14 | 2023-05-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Scheduling of a data transmission |
WO2019114971A1 (en) * | 2017-12-14 | 2019-06-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Scheduling of a data transmission |
Also Published As
Publication number | Publication date |
---|---|
BR112013007733A2 (en) | 2017-09-26 |
EP2627143A1 (en) | 2013-08-14 |
EP2627143A4 (en) | 2017-01-18 |
US20160135165A1 (en) | 2016-05-12 |
EP2627143B1 (en) | 2019-07-03 |
TR201911204T4 (en) | 2019-08-21 |
US10271312B2 (en) | 2019-04-23 |
US9271273B2 (en) | 2016-02-23 |
CN103141144B (en) | 2018-04-27 |
JP2012080416A (en) | 2012-04-19 |
CN103141144A (en) | 2013-06-05 |
WO2012046506A1 (en) | 2012-04-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10917885B2 (en) | Base station, method, computer readable medium, and system for radio communication for suppressing load of blind decoding using a control signal | |
US10271312B2 (en) | Base station, method for radio communication, radio communication system, and radio terminal | |
US11070951B2 (en) | Systems and methods for multicast resource allocation | |
CN112690036B (en) | Method and apparatus for vehicle-to-all communication resource allocation and bandwidth part inactivity timer handling | |
CN109921889B (en) | System and method for common control channel in a communication system | |
TW201941637A (en) | Physical downlink control channel design method for NR systems and user equipment | |
CN117651335A (en) | Information transmission method and device | |
CN110932833A (en) | Information transmission method and device | |
KR20130088021A (en) | Method in which a group of terminals receives a downlink control channel, and method in which the terminals make requests for bandwidth in a wireless communication system in which the same stid or c-rnti is allocated to the group of terminals | |
CN103220680A (en) | Method, device and system for achieving scheduling request | |
WO2016122379A1 (en) | Pdcch initialization suitable for mtc devices | |
WO2015018075A1 (en) | Method to determine the starting subframe of data channel | |
EP2903384B1 (en) | Method for transmitting enhanced random access sequence and machine type communication terminal | |
KR102456934B1 (en) | Method and apparatus for transmitting and receiving data in wireless communication system | |
US10299093B2 (en) | Methods and apparatus for enhanced contention based access response message | |
CN112673599B (en) | Modulation symbol spreading | |
CN107295614B (en) | Control channel detection method, and method and device for reporting TTI length | |
CN114145069B (en) | Wireless communication method, device, communication equipment and storage medium | |
WO2021004336A1 (en) | Method and apparatus for random access |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SONY CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TAKANO, HIROAKI;REEL/FRAME:029864/0454 Effective date: 20130204 |
|
ZAAA | Notice of allowance and fees due |
Free format text: ORIGINAL CODE: NOA |
|
ZAAB | Notice of allowance mailed |
Free format text: ORIGINAL CODE: MN/=. |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 4 |
|
FEPP | Fee payment procedure |
Free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
LAPS | Lapse for failure to pay maintenance fees |
Free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20240223 |