JP5827914B2 - Mobile station - Google Patents

Description

  The present invention relates to a mobile station.

  In a LTE (Long Term Evolution) -Advanced mobile communication system whose specification is being promoted by 3GPP, it is considered to perform “CA (Carrier Aggregation)”.

  In the LTE-Advanced mobile communication system, the mobile station UE can perform CA with one radio base station eNB using a plurality of “Component Carriers (CC)” in different frequency bands at the same time. It is configured as follows.

  Also, when CA is performed, the mobile station UE sets one of a plurality of CCs as a PCC (Primary Component Carrer) and the other as an SCC (Secondary Component Carrer) according to an instruction from the radio base station. ) Is configured to set as.

  In addition, in the LTE-Advanced scheme, in addition to the combination of frequency bands that can perform CA (“Band Combination”), one or more of the combinations of the frequency bands are included in the combination of the corresponding frequency bands. It has been proposed to define a combination of CC bandwidths ("Supported CC Bandwidth Combinations") (see Non-Patent Documents 1 to 4).

3GPP TS36.101 3GPP TS36.331 3GPP contribution R4-120634 3GPP contribution R4-120667

  However, in the methods shown in Non-Patent Documents 3 and 4, in the existing LTE-Advanced scheme, the mobile station UE is included in the “Supported CC Bandwidth Combinations” that it supports in the “Band Combination” that it supports. When operated with a CC having a bandwidth larger than the bandwidth, there is a problem that CA cannot be performed.

  In particular, in a mobile communication system of the LTE-Advanced scheme, in a specific frequency band, when the mobile station UE is operated with a combination of CC bandwidths not targeted, the mobile station UE In spite of having been able to perform CA using CC, there has been a problem that after such expansion, CA cannot be performed using CC within the specific frequency band.

  In such a case, specifically, the mobile station UE cannot receive control information transmitted via the PDCCH (Physical Downlink Control Channel) in the specific frequency band. There was a possibility.

  Therefore, the present invention has been made in view of the above-described problem, and when CA is operated in a specific frequency band, as a combination of CC bandwidths included in the combination of the corresponding frequency bands, Mobile station capable of appropriately receiving control information transmitted via PDCCH in a state where CA is performed in such a specific frequency band even if operation is performed with a combination of non-CC bandwidths The purpose is to provide.

  The first feature of the present invention is used in a mobile communication system in which a combination of frequency bands in which CA can be performed and a combination of carrier bandwidths in the frequency band in which CA can be performed are defined. In the case of a mobile station, a combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined. And when the mobile station supports at least one of the combinations of bandwidths of carriers in the plurality of frequency bands, the carrier in the first frequency band or the second frequency band A receiver configured to receive control information transmitted over the physical downlink control channel in the entire bandwidth of the carrier; It is the gist of.

  The second feature of the present invention is used in a mobile communication system in which a combination of frequency bands in which CA can be performed and a combination of carrier bandwidths in the frequency band in which CA can be performed is defined. In the case of a mobile station, a combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined. And when the mobile station supports at least one of the combinations of bandwidths of carriers in the plurality of frequency bands, the carrier in the first frequency band or the second frequency band The gist of the invention is to include a receiving unit configured to receive control information transmitted using a part of bandwidth in the carrier.

  As described above, according to the present invention, when a CA is operated in a specific frequency band, as a combination of CC bandwidths included in the combination of the corresponding frequency bands, Even if the operation is performed in combination, a mobile station that can appropriately receive control information transmitted through the PDCCH in a state where CA is performed in the specific frequency band can be provided. .

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 3 is a functional block diagram of a mobile station according to the first embodiment of the present invention. It is a figure for demonstrating an example of the combination of CA realizable by the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the function of the receiving part of the mobile station which concerns on the 1st Embodiment of this invention. FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. It is a figure for demonstrating operation | movement of the mobile station which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the mobile communication system which concerns on the 2nd Embodiment of this invention.

(Mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 6, the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated. The mobile communication system according to the present embodiment is an LTE-Advanced mobile communication system.

  In the mobile communication system according to the present embodiment, the mobile station UE can transmit and receive signals to and from the radio base station eNB by simultaneously using the CC of the frequency band F1 and the CC of the frequency band F2. That is, it is comprised so that CA can be performed.

  As shown in FIG. 1, in the mobile communication system according to the present embodiment, the CC of the frequency band F1 is set as “PCC” and the CC of the frequency band F2 is set as “SCC” for the mobile station UE. It shall be.

  As illustrated in FIG. 2, the mobile station UE includes a management unit 11, a transmission unit 12, and a reception unit.

  The management unit 11 is configured to manage a combination of frequency bands that the mobile station UE corresponds to among combinations of frequency bands that can perform CA (“E-UTRA Band Combination” illustrated in FIG. 3). .

  Further, the management unit 11 includes a combination of bandwidths of CCs within a frequency band in which CA can be performed (“Supported CC Bandwidth Combinations” illustrated in FIG. 3) in the combination of frequency bands supported by the mobile station UE. The mobile station UE is configured to manage a combination of corresponding bandwidths.

  For example, in the mobile communication system according to the present embodiment, as shown in FIG. 3, “E-UTRA Band Combination” and “Supported CC Bandwidth Combinations” may be defined.

  As shown in FIG. 3, in the mobile communication system according to the present embodiment, a plurality of “Supported CC Bandwidth Combinations” can be defined for one “E-UTRA Band Combination”.

  Here, the management unit 11 combines “E-UTRA Band # 5” and “E-UTRA Band # 1” as “E-UTRA Band Combination” to which the mobile station UE corresponds (“5, shown in FIG. 3). 1 ") may be managed.

  Further, the management unit 11 sets “Supported CC Bandwidth Combinations” supported by the mobile station UE in the downlink as “10 MHz” in “E-UTRA Band # 5” and “10 MHz in“ E-UTRA Band # 1 ”. ”(“ DL: 10 + 10 ”shown in FIG. 3) may be managed.

  Further, the management unit 11 may be configured to manage combinations similar to those in the downlink as “Supported CC Bandwidth Combinations” supported by the mobile station UE in the uplink.

  The transmission unit 12 is configured to transmit various signals to the radio base station eNB with which the mobile station UE is communicating.

  For example, when the mobile station UE supports at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment, the transmission unit 12 Thus, instead of “Supported CC Bandwidth Combinations” supported by the mobile station UE, the mobile station UE is configured to notify the maximum amount of data that can be processed within a predetermined period.

  Here, the predetermined period may be a predetermined number (for example, one) subframes, or may be a predetermined number (for example, one) TTI (Transmission Time Interval).

  Moreover, the transmission part 12 may be comprised so that the number of resource blocks may be notified as the above-mentioned maximum data amount.

  For example, the transmission unit 12 may be configured to notify the maximum data amount by a predetermined bit in “UE Capability (capability information)”.

  The receiving unit 13 is configured to receive various signals from the radio base station eNB with which the mobile station UE is communicating.

  For example, the receiving unit 13 is configured to receive control information including scheduling information, broadcast information, downlink data, and the like from the radio base station eNB.

  Here, when the receiving unit 12 corresponds to at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment, “E-UTRA Band” that can be used for CA is used. The control information transmitted via the PDCCH is received in the entire bandwidth of the CC in “# 5” and “E-UTRA Band # 1”.

  For example, as illustrated in FIG. 4A, the mobile station UE transmits “Supported CC Bandwidth Combinations” as “Supported CC Bandwidth Combinations” in “E-UTRA Band # 5”, “10 MHz” and “E-UTRA Band # 1”. In the mobile communication system according to the present embodiment, a CC having a bandwidth of “10 MHz” is used in “E-UTRA Band # 5” even when the combination of “10 MHz” in “ In addition, when a CC having a bandwidth of “20 MHz” is used in “E-UTRA Band # 1”, the reception unit 13 transmits via the PDCCH as shown in FIG. Control information to be received is received in the entire bandwidth of “20 MHz” of CC in “E-UTRA Band # 1” Is constructed sea urchin.

  Here, although the control information transmitted via the PDCCH is allocated to the entire bandwidth of each CC, since the transmission rate is generally low, the receiving unit 13 can use “E− Even if control information transmitted via the PDCCH is received over the entire bandwidth of the CC within the UTRA Band # 5 and E-UTRA Band # 1, the processing load does not increase dramatically. .

  Further, when performing communication via the PDSCH in the PCC and the SCC, the receiving unit 13 can receive the total of the downlink data size transmitted in the PCC and the downlink data size transmitted in the SCC at the corresponding mobile station UE. The maximum data size may be configured to receive downlink data via the PDSCH.

  For example, in the mobile communication system according to the present embodiment, a CC in “E-UTRA Band # 5” is set as “PCC” for the mobile station UE, and “E-UTRA Band # 1” is set as “SCC”. Let us consider a case in which the CC is set.

  Also, a CC having a bandwidth of “10 MHz” is used in “E-UTRA Band # 5”, and a CC having a bandwidth of “20 MHz” is used in “E-UTRA Band # 1”. Assuming that

  In such a case, the reception unit 13 of the mobile station UE that can handle a bandwidth of “20 MHz” can receive downlink data via the PDSCH on the CC (SCC) in the “E-UTRA Band # 1”.

  Since the mobile station UE can receive a total of up to 20 MHz width, if a “5 MHz” PDSCH resource is allocated in “E-UTRA Band # 5”, the mobile station UE will be able to receive “E-UTRA Band”. On the CC (SCC) in “# 1”, downlink data having a bandwidth of “15 MHz” is received via the PDSCH.

  Furthermore, when the receiving unit 13 supports at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment, “E-UTRA Band # 5” and “E -Broadcast information assigned to the central bandwidth (for example, the central 28 resource block) of the CC in “UTRA Band # 1” may be received.

  Such broadcast information may be assigned by the “Distributed” assignment method, or may be assigned by the “Localized” assignment method.

  In addition, when the reception unit 13 corresponds to at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment, the reception unit 13 receives the individual signaling from the radio base station eNB. , Pcell (PCC serving cell) and Scell (SCC serving cell) broadcast information (MIB (Master Information Block), SIB (System Information Block), etc.) may be received.

  Alternatively, when the reception unit 13 corresponds to at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment, in the case of “Inter-cell Handover”, the Pcell And broadcast information in Scell may be received.

  In addition, the reception unit 13 corresponds to at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment, and the CA set for the mobile station UE. After ending once, it may be configured to receive broadcast information in Pcell and Scell, and then resume such CA.

  As illustrated in FIG. 5, the radio base station eNB includes a reception unit 21, a scheduling unit 22, and a transmission unit 23.

  The receiving unit 21 is configured to receive various signals from the mobile station UE in communication with the radio base station eNB.

  For example, the receiving unit 21 is configured to receive the above-mentioned “UE Capability” or the like from the mobile station UE.

  The scheduling unit 22 is configured to perform scheduling processing for the mobile station UE.

  For example, the scheduling unit 22 may be configured to perform scheduling processing on the mobile station UE based on the above-described maximum data amount (for example, the number of resource blocks) acquired from the mobile station UE.

  In such a case, the scheduling unit 22 allocates resources for transmitting downlink data up to the bandwidth corresponding to the mobile station UE in the PCC of the mobile station UE, and allocates resources for transmitting the remaining downlink data in the SCC of the mobile station UE. It may be configured to allocate.

  Alternatively, the scheduling unit 22 determines the CC bandwidth that can be received by the mobile station UE based on the maximum transmission rate determined based on the “UE Category” of the mobile station UE and the MCS (Modulation and Coding Scheme) used for transmission. And scheduling processing may be performed based on the bandwidth.

  For example, the scheduling unit 22 may allocate the total so that the maximum is 20 MHz.

  The transmission unit 23 is configured to transmit various signals to the mobile station UE in communication with the radio base station eNB.

  For example, the transmission unit 23 is configured to transmit scheduling information of downlink data in Pcell and Scell to the mobile station UE via PDCCH on the PCC and SCC of the mobile station UE, respectively. Also good.

  Moreover, the transmission part 23 may be comprised so that alerting | reporting information may be transmitted with respect to this mobile station UE using the center bandwidth (for example, center 28 resource block) of PCC and SCC.

  Moreover, the transmission part 23 may be comprised so that the alerting | reporting information in Pcell may be transmitted with respect to this mobile station UE by separate signaling.

  Here, as this individual signaling, an information element for transmitting broadcast information in Scell, that is, an information element “RRC Reconfiguration message” defined in 6.2.2 of 3GPP TS36.331 “ScellAddMod” may be extended and used.

  Furthermore, the transmission unit 23 may be configured to transmit broadcast information in the Pcell and Scell during “Inter-cell Handover”.

  Moreover, in order to transmit the alerting | reporting information in Pcell, the transmission part 23 may be comprised so that CA currently set with respect to the mobile station UE may be cancelled | released once.

  For example, when the transmission unit 23 detects that it is necessary to change the broadcast information in the Pcell, after canceling the CA set for the target mobile station UE, the transmission unit 23 changes the broadcast information in the Pcell to be transmitted. After a predetermined period of time, the CA may be set again for the mobile station UE.

  Further, the transmission unit 23 is configured to transmit downlink data to the mobile station UE via the PDSCH based on the result of the above scheduling process on the PCC and SCC of the mobile station UE. May be.

  Hereinafter, with reference to FIG. 6, an operation example of the mobile station UE according to the present embodiment will be described.

  As shown in FIG. 6, in step S101, the mobile station UE receives the above-described control information via the PDCCH in the entire bandwidth of the CC set as the PCC and SCC of the mobile station UE.

  In step S102, the mobile station UE receives broadcast information in Pcell and broadcast information in Scell.

  In step S103, the mobile station UE receives downlink data via PDSCH on the PCC or SCC based on the control information and broadcast information.

  According to the mobile communication system according to the first embodiment of the present invention, the mobile station UE uses the bandwidth of the CC included in the “Supported CC Bandwidth Combinations” that it supports in the “Band Combination” that it supports. Control information transmitted via the PDCCH can be received in all the PCC and SCC bandwidths set for the mobile station UE, even when the CC is operated with a large bandwidth CC. CA can be performed appropriately.

(Mobile communication system according to the second embodiment of the present invention)
A mobile communication system according to the second embodiment of the present invention will be described with reference to FIG. Hereinafter, the mobile communication system according to the second embodiment of the present invention will be described by focusing on differences from the above-described mobile communication system according to the first embodiment.

  In the mobile communication system according to the second embodiment of the present invention, the receiving unit 13 of the mobile station UE corresponds to at least one of “Supported CC Bandwidth Combinations” defined in the mobile communication system according to the present embodiment. The control information transmitted using the CC in the “E-UTRA Band # 5” or a part of the bandwidth in the CC in the “E-UTRA Band # 1”. Has been.

  For example, the receiving unit 13 may be configured to receive control information via an E-PDCCH (Enhanced-Physical Downlink Control Channel).

  On the other hand, in the mobile communication system according to the second embodiment of the present invention, the transmission unit 23 of the radio base station eNB performs CC in “E-UTRA Band # 5” or CC in “E-UTRA Band # 1”. The mobile station UE is configured to transmit control information via the E-PDCCH.

  Here, the E-PDCCH is a channel that has been studied for introduction by the LTE (Release-11) system in order to solve the problem of insufficient capacity of the PDCCH.

  As illustrated in FIGS. 7A and 7B, the transmission unit 13 may be configured to allocate E-PDCCH transmission resources in the PDSCH transmission resource allocation region.

  In addition, it is assumed that the reception unit 13 demodulates the E-PDCCH using DM-RS (Demodulation Reference Signal) unique to the mobile station UE. As a result, a beam forming gain can be obtained, which is effective for increasing the capacity.

  Further, as illustrated in FIG. 7A, the transmission unit 23 may be configured to allocate E-PDCCH transmission resources by the “Localized Transmission” method, as illustrated in FIG. 7B. In addition, the transmission resource of the E-PDCCH may be allocated by the “Distributed Transmission” method.

  The characteristics of the present embodiment described above may be expressed as follows.

  The first feature of the present embodiment is that a combination of frequency bands capable of performing CA (E-UTRA Band Combination) and a combination of bandwidths of CCs in a frequency band capable of performing CA (Supported CC Bandwidth). A mobile station UE used in a mobile communication system in which a combination is defined, and as a combination of such frequency bands, a first frequency band (for example, E-UTRA Band # 5) and a second frequency band (for example, E -UTRA Band # 1) combination is defined, and a combination of CC bandwidths in a plurality of frequency bands is defined, and when the mobile station UE has CCs in the plurality of frequency bands Supports at least one bandwidth combination In this case, the control information transmitted via the PDCCH (physical downlink control channel) is received in the entire bandwidth of the CC in the first frequency band or the CC in the second frequency band. The gist is that the receiver 13 is provided.

  The second feature of the present embodiment is that a combination of frequency bands capable of performing CA (E-UTRA Band Combination) and a combination of bandwidths of CCs in a frequency band capable of performing CA (Supported CC Bandwidth). A mobile station UE used in a mobile communication system in which a combination is defined, and as a combination of such frequency bands, a first frequency band (for example, E-UTRA Band # 5) and a second frequency band (for example, E -UTRA Band # 1) combination is defined, and a combination of CC bandwidths in a plurality of frequency bands is defined, and when the mobile station UE has CCs in the plurality of frequency bands Supports at least one bandwidth combination In this case, the receiver 13 is configured to receive control information transmitted using a part of the bandwidth in the CC in the first frequency band or the CC in the second frequency band. Is the gist.

  In the second feature of the present embodiment, the reception unit 13 may be configured to receive control information via the E-PDCCH.

  Note that the operations of the mobile station UE and the radio base station eNB described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both. .

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a hard disk, a registerable ROM, a hard disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE and the radio base station eNB. Moreover, this storage medium and processor may be provided in the mobile station UE and the radio base station eNB as a discrete component.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

UE ... mobile station eNB ... radio base station 11 ... management unit 12, 23 ... transmission unit 13, 21 ... reception unit 22 ... scheduling unit

Claims (3)

A mobile station used in a mobile communication system in which a combination of frequency bands capable of performing CA (Carrier Aggregation) and a combination of carrier bandwidths in the frequency band capable of performing CA are defined. ,
A combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined, and the mobile station Is corresponding to at least one of the combinations of the bandwidths of the carriers in the plurality of frequency bands, the carrier in the first frequency band or the entire bandwidth of the carrier in the second frequency band. A mobile station comprising a receiving unit configured to receive control information transmitted via a physical downlink control channel. A mobile station used in a mobile communication system in which a combination of frequency bands capable of performing CA (Carrier Aggregation) and a combination of carrier bandwidths in the frequency band capable of performing CA are defined. ,
A combination of a first frequency band and a second frequency band is defined as a combination of the frequency bands, and a combination of carrier bandwidths in a plurality of the frequency bands is defined, and the mobile station Corresponds to at least one of the combinations of the bandwidths of the carriers in the plurality of frequency bands, a part of the carriers in the first frequency band or the carriers in the second frequency band. A mobile station comprising a receiving unit configured to receive control information transmitted using a bandwidth.   The mobile station according to claim 2, wherein the receiving unit is configured to receive control information via an E-PDCCH (Enhanced-Physical Downlink Control Channel).

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