WO2010016596A1 - Station de base, terminal de communication, système de communication, procédé de commande de station de base, procédé de commande de terminal de communication, procédé de commande de système de communication, programme de commande et support d'enregistrement - Google Patents

Station de base, terminal de communication, système de communication, procédé de commande de station de base, procédé de commande de terminal de communication, procédé de commande de système de communication, programme de commande et support d'enregistrement Download PDF

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Publication number
WO2010016596A1
WO2010016596A1 PCT/JP2009/064069 JP2009064069W WO2010016596A1 WO 2010016596 A1 WO2010016596 A1 WO 2010016596A1 JP 2009064069 W JP2009064069 W JP 2009064069W WO 2010016596 A1 WO2010016596 A1 WO 2010016596A1
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frequency band
lte
base station
sub
communication terminal
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PCT/JP2009/064069
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English (en)
Japanese (ja)
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磊 黄
仁茂 劉
銘 丁
晨 陳
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シャープ株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA

Definitions

  • the present invention relates to a technical field of mobile communication, and in particular, a base station, a communication terminal, a communication system, a base station control method, a communication terminal control method, and a communication system to which LTE (Long-Term Evolution) -Advanced is applied.
  • the present invention relates to a control method, a control program, and a recording medium.
  • LTE-A LTE-Advanced
  • LTE-A should support a maximum system frequency bandwidth of 100 MHz.
  • the system frequency bandwidth of 100 MHz may be formed by one continuous frequency spectrum (continuous plural carriers), or may be formed by collecting a plurality of non-continuous frequency spectra (non-contiguous plural carriers). Also good.
  • the draft also describes that LTE and LTE-A can coexist on the same frequency spectrum. In this case, LTE-A needs to be compatible with conventional LTE-compatible user apparatuses (communication terminals and mobile station apparatuses).
  • the system frequency bandwidth of the LTE communication system is designed to a maximum of 20 MHz
  • the system frequency bandwidth of the LTE-compatible user device is also 20 MHz.
  • LTE-A design in particular, system frequency band segmentation, downlink broadcast channel (BCH: Broadcast CHannel) synchronization channel (SCH: Synchronization Channel) design, and system control signaling (PDCCH: Physical Downlink Control Channel) Issues with respect to design and the like.
  • BCH Broadcast CHannel
  • SCH Synchronization Channel
  • PDCCH Physical Downlink Control Channel
  • Non-Patent Document 2 the system frequency bandwidth of LTE-A is divided into a plurality of sub-frequency bands of 20 MHz (a plurality of carriers, one carrier is referred to as a component carrier CC), and the sub-frequency band of 20 MHz.
  • Each (CC) transmits a synchronization channel SCH and a broadcast channel BCH, thereby having compatibility with a 20 MHz LTE-compatible user apparatus.
  • Non-Patent Document 3 the LTE reference signal RS (Reference Signal), the synchronization channel SCH, the broadcast channel BCH, and the control channel PDCCH are transmitted in at least some CCs of LTE-A. It is ensured that the corresponding user apparatus preferably accesses the partial CC of LTE-A.
  • Huawei Company says that when the synchronization channel SCH and the broadcast channel BCH are transmitted in a plurality of CCs of LTE-A, the occupation rate of radio resources increases and the design of LTE-A becomes more complicated.
  • Non-Patent Document 5 At the meeting in Kansas, USA in May, NTT Docomo Co., Ltd. expressed the same viewpoint as Huawei Company (Non-patent Document 4). Meanwhile, at the conference, Texas Instruments Corporation in the United States announced that it would support Panasonic's proposal (Non-Patent Document 5).
  • Non-patent Document 6 the system frequency bandwidth of LTE-A is divided into multiple CCs, one of which is set as the main CC, and all other CCs are set as sub CCs.
  • the LTE synchronization channel SCH, broadcast channel BCH, and control channel PDCCH are transmitted in both the main CC and the sub CC.
  • LTE-A synchronization channel SCH, broadcast channel BCH, and control channel PDCCH are also transmitted in the main CC.
  • both the method proposed by Panasonic Corporation and the method proposed by Chukoh Co., Ltd. transmit LTE-related channels corresponding to each sub CC within a plurality of sub CCs. Any of these CCs must support access of LTE-compatible user equipment. This makes it difficult to design LTE-A and greatly increases the load on LTE-A.
  • LTE-A in which CC is several times the number of LTE, the same number of base stations as in LTE is provided when serving the same number of users as in LTE. Do not need. Therefore, when LTE-A covers the same number of user equipment as the number of user equipment in LTE, it can be covered with fewer base stations than LTE.
  • the Huawei company's method is to transmit the LTE channel related channel by at least one sub CC.
  • the Huawei company's method is to transmit the LTE channel related channel by at least one sub CC.
  • the operating system frequency bandwidth of an LTE-A capable user device that accesses an LTE-A system where the system frequency bandwidth is expected to reach 100 MHz may be less than 100 MHz. Further, it is necessary to make LTE-A compatible with a conventional user apparatus for LET.
  • how to design and standardize for LTE-A provides a highly efficient service to LTE-capable user equipment, has an operating system frequency bandwidth greater than LTE-capable user equipment, and a plurality of An object of the present invention is to solve the problem of not adversely affecting an LTE-A compatible user apparatus having a CC.
  • a base station includes a receiving unit that receives operation width information indicating an operable frequency bandwidth of a communication terminal from a communication terminal connected to the own station; A part of the frequency bandwidth of the connected communication system to which LTE-A is applied is determined as the main frequency band of the communication system, and a portion excluding the determined main frequency band in the frequency band of the communication system is determined Dividing into one or more sub frequency bands, selecting a sub frequency band corresponding to the communication terminal based on the operation range information, and combining the selected sub frequency band and the main frequency band to perform the communication The operating frequency band of the terminal is set, the sub frequency band to which the PDCCH is allocated is determined from the set operating frequency band, and the LTE PDC is determined in the determined sub frequency band.
  • Access control / scheduling means for performing H allocation, and transmission means for transmitting frequency band allocation information indicating an operating frequency band set by the access control / scheduling unit to the communication terminal of LTE, in the main frequency band Control signaling and channel design are both compatible with LTE, and the main frequency band includes LTE system information, LTE-A system information, and LTE broadcast by a broadcast channel compatible with LTE.
  • -A includes downlink control channel information commonly used in -A.
  • a main CC and a sub CC can be provided, and compatibility with LTE can be provided in the main CC, and a high-quality service can be provided to an LTE-compatible communication terminal.
  • the main CC includes information for all user devices, synchronization information, and common control information, and assigns an operating system frequency bandwidth (multiple CCs) to each LTE-A compatible communication terminal.
  • all CCs can be used effectively. Therefore, the above-described base station can easily realize compatibility with LTE-compatible communication terminals in a communication system to which LTE-A is applied, and LTE-compatible communication terminals and various LTE-A-compatible communication terminals.
  • a high-speed data communication service can be provided.
  • the present invention is efficient for LTE-A-compatible user equipment that is compatible with LTE-compatible user equipment and has a larger operable frequency bandwidth (one CC).
  • the present invention provides a downlink CC configuration method in which CC is allocated when an LTE-A-compatible user apparatus accesses the mobile communication system and notified to the user apparatus by an appropriate signaling mechanism.
  • a downlink CC configuration method in a communication system to which LTE-A of the present invention is applied a part of the LTE-A system frequency bandwidth is partially transferred by the base station to the main CC of LTE-A.
  • an allocation sub CC to which a PDCCH (Packet Data Control Channel) is allocated is determined from the operating frequency bandwidth for the user apparatus.
  • the control signaling and channel design in the main CC are both compatible with LTE, and in the main CC, in addition to LTE-defined system information broadcast by a broadcast channel compatible with LTE, LTE -A includes all the information, and the main CC includes downlink control channel information commonly used in LTE-A.
  • the user equipment For the sub-CC in the operating frequency bandwidth It performs processing for each sub-CC after sorting, is characterized by performing the PDCCH blind test defined in LTE.
  • the main CC is preferably located in the frequency band with the largest bandwidth.
  • the main CC is preferably located in the middle of the system frequency bandwidth of LTE-A.
  • the LTE-A system information preferably includes LTE-A frequency point information and sub-frequency bandwidth information.
  • the base station assigns a sub CC to the user apparatus based on the operable frequency bandwidth of the user apparatus.
  • the base station allocates a sub frequency band to the user apparatus based on the operable frequency bandwidth of the user apparatus and the load state of each sub CC.
  • signaling in a higher layer in the first subframe scheduled by the base station for the user apparatus in the frequency band allocation information is transmitted from the base station to the user apparatus.
  • the first subframe scheduled for the user apparatus is located in the main CC.
  • the main CC determination step and the sub CC classification step are performed in the initialization process of the system.
  • the frequency band allocation step is performed in a random access process of the user apparatus.
  • the user apparatus in the frequency band allocation step, preferably transmits operable frequency bandwidth information of the user apparatus to the base station according to RRC access billing information in a random access process.
  • the frequency band allocation information is preferably transmitted from the base station to the user equipment by contention resolution signaling in a random access process.
  • the base station of the present invention determines a part of the LTE-A frequency bandwidth as the main frequency band of LTE-A, and excludes the main frequency band in the LTE-A frequency band.
  • Control signaling in the main frequency band including an access control / scheduling unit that divides the portion into one or more sub-frequency bands, and a transmission / reception unit that receives information on the operable frequency bandwidth from the user apparatus.
  • the channel design are both compatible with LTE, and within the main frequency band, all system information defined in LTE-A, as well as system information defined by LTE, broadcasted by a broadcast channel compatible with LTE are included.
  • Information is included, and the main frequency band includes downlink signals commonly used in LTE-A.
  • Control channel information is included, and the access control / scheduling unit selects a sub-frequency band corresponding to the user apparatus based on information on an operable frequency band range of the user apparatus received from the user apparatus. Then, the selected sub frequency band and the main frequency band are combined and set as the operating frequency band of the user apparatus, and then the sub frequency band to which the PDCCH is allocated from the operating frequency band is set for the user apparatus.
  • the transmission / reception unit transmits frequency band allocation information to the user apparatus in a signaling manner, and the transmission / reception unit performs LTE-defined PDCCH allocation in a sub-frequency band to which the PDCCH is allocated. Yes.
  • the access control / scheduling unit allocates a sub CC to the user apparatus based on the operable frequency band range of the user apparatus.
  • the access control / scheduling unit allocates a sub frequency band to the user apparatus based on an operable frequency band range of the user apparatus and a current load state of each sub CC. .
  • the transmission / reception unit transmits the frequency band allocation information to the user apparatus by higher layer signaling in the first subframe scheduled for the user apparatus.
  • the transmission / reception unit transmits the frequency band information to the user apparatus by contention resolution signaling in a random access process.
  • the user apparatus is a user apparatus including a transmission / reception unit and a PDCCH detection unit, and the transmission / reception unit transmits information on an operable frequency bandwidth of the user device to a base station.
  • the PDCCH detection unit performs reordering processing on the sub CCs in the operating frequency band, and performs PDCCH blind detection defined in LTE for each sub CC after the reordering processing. .
  • the transmission / reception unit reports information on an operable frequency band range of the user apparatus to the base station based on RRC access request information in a random access process.
  • the main CC and the sub CC are provided, and the main CC provides compatibility with LTE. Can provide high quality service.
  • the main CC includes system information, synchronization information, and common control information for all communication terminals.
  • FIG. 1 is a schematic diagram of a mobile communication system to which LTE-A is applied. It is a block diagram of a base station included in the mobile communication system.
  • FIG. 2 is a block diagram of an LTE-A compatible terminal included in the mobile communication system.
  • Fig. 11 is a sequence diagram when CC allocation information is acquired in a stage where the LTE-A compatible terminal randomly accesses the mobile communication system.
  • FIG. 10 is a sequence diagram when the LTE-A compatible terminal acquires CC allocation information by higher layer signaling.
  • FIG. 11 is a sequence diagram when the LTE-A compatible terminal acquires CC allocation information by higher layer signaling.
  • FIG. 3 is an explanatory diagram showing a state in which a PDCCH is allocated to an LTE-A compatible terminal in the mobile communication system. It is the schematic of CC structure in LTE-A.
  • FIG. 3 is an explanatory diagram showing CCs assigned to LTE-compatible terminals and LTE-A-compatible terminals in the mobile communication system.
  • the following embodiment is applied to a mobile communication system to which LTE-A is applied. Note that the present invention is not limited to the applications described in these embodiments, and can be applied to other mobile communication systems.
  • FIG. 1 is a schematic diagram of a mobile communication system (communication system) 100 to which LTE-A is applied.
  • the mobile communication system 100 is a network to which LTE-A is applied.
  • the base station 101 is a service control center of the mobile communication system 100, and radio resources of user apparatuses such as an LTE compatible terminal (LTE communication terminal) 102 and an LTE-A compatible terminal (LTE-A communication terminal) 103 in the cell. Performs scheduling (resource allocation) and data transmission related to data services.
  • LTE communication terminal LTE communication terminal
  • LTE-A communication terminal LTE-A communication terminal
  • the LTE compatible terminal 102 is a user apparatus used in a network to which LTE is applied, and operates with one CC of the LTE standard according to an operation mechanism based on LTE uplink / downlink control signaling.
  • the LTE-A compatible terminal 103 operates in accordance with an operation mechanism based on the LTE-A standard in a plurality of CCs based on the LTE-A standard.
  • the mobile communication system 100 can provide data services corresponding to the two types of user devices (LTE compatible terminal 102 and LTE-A compatible terminal 103) described above. Note that the mobile communication system 100 shown in FIG. 1 is for explaining the schematic configuration of the present invention, and is not limited to the above configuration when the present invention is actually implemented in a mobile communication system. For example, although FIG. 1 shows one LTE-compatible terminal 102 and one LTE-A-compatible terminal 103, a plurality of base stations and a plurality of base stations may be used.
  • the mobile communication system 100 includes at least one base station 101.
  • the base station 101 In the cell of the base station 101, several LTE compatible terminals 102 and several LTE-A compatible terminals 103 are allocated.
  • the base station 101 controls each LTE-compatible terminal 102 and LTE-A-compatible terminal 103 allocated in the cell by radio resource scheduling and control signaling.
  • FIG. 2 is a block diagram showing a main configuration of the base station 101.
  • the base station 101 includes a transmission / reception unit (transmission unit, reception unit) 1010, an access control / scheduling unit (access control / scheduling unit) 1011, and a determination unit 1012.
  • the transmission / reception unit 1010 transmits / receives control signaling and user data to / from user devices in the cell.
  • the access control / scheduling unit 1011 controls access and assigns a CC to a newly accessed user apparatus.
  • the determination unit 1012 determines whether the user apparatus corresponds to an LTE compatible terminal or an LTE-A compatible terminal from the random access information of the user apparatus.
  • FIG. 3 is a block diagram illustrating a main configuration of the LTE-A compatible terminal 103.
  • the LTE-A compatible terminal 103 includes a transmission / reception unit (transmission / reception unit) 1030, a random access unit 1031, a filter adjustment unit 1032, an information acquisition unit 1033, and a PDCCH detection unit (PDCCH detection unit) 1034. It is a configuration.
  • the transmission / reception unit 1030 transmits / receives control signaling and user data to / from the base station 101.
  • the random access unit 1031 generates random access information according to the type of user device (LTE compatible terminal or LTE-A compatible terminal).
  • the filter adjustment unit 1032 preferably adjusts the parameters (center frequency, frequency bandwidth) of the reception frequency band filter based on CC allocation information from the base station.
  • the information acquisition unit 1033 is operable to determine whether a user apparatus that transmits and receives information via the base station 101 is an LTE compatible terminal or an LTE-A compatible terminal.
  • System of LTE communication system broadcast by user device capability such as system frequency bandwidth and number of CCs to be supported, information on user device category information (internal information), and broadcast channel BCH (708 in FIG.
  • the system information (external information) of the mobile communication system 100 including the information and the system information of the LTE-A communication system broadcasted by the additional broadcast channel BCH-A (707 in FIG. 7) is acquired.
  • the system information includes LTE-A communication system information such as LTE-A system frequency bandwidth, number of CCs, CC number, CC center frequency, CC frequency bandwidth, in addition to all LTE system information.
  • the PDCCH detection unit 1034 performs PDCCH blind detection according to the LTE standard for all CCs within the operating system frequency bandwidth.
  • the PDCCH blind detection method is described in 3GPP related standards.
  • FIGS. 2 and 3 show specific configurations of the base station 101 and the LTE-A compatible terminal 103 according to the embodiment of the present invention.
  • the present invention is It is obvious that the present invention is not limited to these specific configurations, and can be matched, divided, or combined with some or all of the configurations, or can be realized by software, hardware, or a combination thereof. is there.
  • the mobile communication system 100 of the present invention shows an LTE-A CC allocation method.
  • the system frequency bandwidth of LTE-A is indicated as Ba (MHz).
  • the system frequency bandwidth Ba of LTE-A can be set to 100 MHz from the draft of the resolution submitted at the recently opened LTE-A conference.
  • the frequency bandwidth of the LTE CC is indicated as B (MHz).
  • the range of B is 1.25 to 20 MHz.
  • B is set to 20 MHz.
  • Specific system frequency bandwidth, CC configuration, etc. of LTE-A are designed by a mobile phone service provider, and are notified to user devices (communication terminals) as LTE-A system information.
  • the access control / scheduling unit 1011 of the base station 101 uses B (unit: “MHz”) in the LTE-A system frequency band Ba (unit: “MHz”, which is 100 MHz in the present embodiment).
  • the frequency bandwidth is set to the main CC.
  • the center frequency of the main CC is on an integer multiple of 100 kHz (the channel interval of the LTE communication system, that is, the raster is 100 kHz).
  • the signal format in the main CC (703) is completely compatible with LTE. That is, within the 20 MHz frequency band, LTE broadcast channel BCH (708), synchronization channel SCH, and downlink control channel PDCCH completely follow the conventional LTE design according to 3GPP specifications.
  • the 20 MHz main CC (703) includes an LTE-A broadcast channel BCH-A (707).
  • the LTE-A broadcast channel BCH-A (707) is formed of an LTE broadcast channel BCH (708) and an additional broadcast channel BCH-A having system information specific to the LTE-A communication system.
  • the common search area (Common ⁇ ⁇ ⁇ Search Space) included in the PDCCH is in the main CC (703).
  • the LTE compatible terminal 102 obtains LTE system information configured by master information MIB (Master Information Block) and multiple system information SIBs (System Information Blocks) of the LTE communication system from the broadcast channel BCH of the LTE communication system. Can be acquired.
  • the LTE-A compatible terminal 103 combines BCH and BCH-A, that is, LTE-A communication system system information in BCH and master information MIB and system information in the LTE-A communication system in BCH-A.
  • LTE-A related information such as SIBs, system information specific to LTE-A communication system, and frequency allocation of LTE-A system frequency bandwidth, number of CCs, CC number, CC center frequency, CC frequency bandwidth LTE-A system information configured by information and the like can be acquired.
  • the main CC is arranged in a continuous CC having the largest frequency bandwidth.
  • a plurality of LTE-A CCs are continuous (continuous CC)
  • the main CC is arranged in the center CC among the plurality of CCs of the LTE-A.
  • the main CC is not limited to the central CC, and may be a CC near the center. Further, when the plurality of CCs are even numbers, any one of the vicinity of the two CCs in the center of the continuous CCs or a CC in the vicinity thereof may be used.
  • the center frequency of the main CC is an integer multiple of 100 kHz of the frequency so that the LTE compatible terminal 102 and the LTE-A compatible terminal 103 can perform initial cell search (SCH reception) in the main CC.
  • the access control / scheduling unit 1011 sets a portion excluding the B (MHz) portion of the LTE-A system frequency bandwidth as a sub CC.
  • the sub CC can be divided into a plurality of sections according to the design. In this embodiment, one section is set to 10 MHz, and the LTE-A system frequency band includes a total of eight sub CCs.
  • FIG. 4 is a sequence diagram showing a first example of a flow of control signaling transmission / reception between the LTE-A compatible terminal 103 and the base station 101 when the LTE-A compatible terminal 103 accesses the base station 101. is there.
  • the transmission / reception unit 1030 of the LTE-A compatible terminal 103 receives the synchronization channel SCH in the main CC, and performs system synchronization between the LTE-A compatible terminal 103 and the base station 101.
  • the information acquisition unit 1033 of the LTE-A compatible terminal 103 acquires the system information of the mobile communication system 100 through the broadcast channel BCH and the additional broadcast channel BCH-A in the main CC.
  • the LTE-A compatible terminal 103 compares the bandwidth of the mobile communication system 100 in the acquired system information with the operable frequency band range of the LTE-A compatible terminal 103.
  • the random access unit 1031 of the LTE-A compatible terminal 103 is defined by 3GPP. Random access according to the LTE standard.
  • the LTE-A compatible terminal 103 uses the newly defined LTE-A random number as follows. Access.
  • the LTE-A compatible terminal 103 transmits a random access channel (RACH) through an uplink CC (uplink CC paired with the main CC) corresponding to the main CC in the LTE-A system frequency bandwidth.
  • RACH random access channel
  • the base station 101 transmits random access response information (RACH message B) to the LTE-A compatible terminal 103 through the main CC (42).
  • the transmission / reception unit 1030 of the LTE-A compatible terminal 103 connects to RRC (Radio Resource Control) in the information (RACH message C) during the random access process through a common control channel (CCCH: Common Control Channel) in the random access channel.
  • RRC Radio Resource Control
  • CCCH Common Control Channel
  • Information on the operable system frequency bandwidth of the LTE-A compatible terminal 103 is added to the billing information and transmitted to the base station 101 (43).
  • the access control / scheduling unit 1011 of the base station 101 based on the acquired operable system frequency bandwidth of the LTE-A compatible terminal 103, the current load state of the mobile communication system 100, and the load state of each sub CC, The LTE-A system frequency bandwidth to be allocated to the LTE-A compatible terminal 103 and the main CC are determined.
  • FIG. 8 shows one specific example of LTE-A system frequency bandwidth allocated to the LTE-A compatible terminal 103B and main CC allocation.
  • the operable system frequency bandwidth of the LTE-A compatible terminal 103B is 60 MHz, and in addition to including one fixed 20 MHz main CC (805) in the 60 MHz, four 10 MHz Of sub-CCs (806, 807, 808, 809).
  • the access control / scheduling unit 1011 of the base station 101 acquires the number of user devices allocated in each sub CC, and allocates the four sub CCs with the smallest number of user devices allocated to the LTE-A compatible terminal 103 by rearrangement. .
  • Other sub CCs may be assigned. Other methods may be used for the CC allocation method.
  • the base station 101 adds allocation information to the LTE-A compatible terminal 103 to contention resolution information (downlink control signaling, Contention Resolution, RACH message D), which is information during the random access process, and transmits the information to the base station. .
  • the filter adjustment unit 1032 of the LTE-A compatible terminal 103 preferably adjusts the reception frequency band filter parameters (center frequency, frequency bandwidth) and receives downlink information. To do.
  • FIG. 5 is a sequence diagram showing a second example of the flow of control signaling transmission / reception between the LTE-A compatible terminal 103 and the base station 101 when the LTE-A compatible terminal 103 accesses the base station 101. is there.
  • the access control / scheduling unit 1011 of the base station 101 performs the procedure 503 based on the acquired operable system frequency bandwidth of the LTE-A compatible terminal 103, the current load state of the mobile communication system 100, and the load state of each CC.
  • the system frequency bandwidth to be allocated to the LTE-A compatible terminals 102 and 103 (A to D) and the main CC are determined.
  • FIG. 8 is an explanatory diagram showing an example of assigning CCs to the LTE compatible terminal 102 and the plurality of LTE-A compatible terminals 103. A second example of assignment will be described with reference to FIG. In the example shown in FIG. 8, CC allocation states are shown for the LTE compatible terminal 102 and the four LTE-A compatible terminals 103 (A to D).
  • the LTE compatible terminal 102 with an operable system frequency bandwidth of 20 MHz is assigned a main CC (805) of 20 MHz.
  • the LTE-A compatible terminal 103A having an operating system frequency band of 40 MHz is assigned two 10 MHz sub CCs (801, 802) in addition to the main CC (805).
  • CC (803,808) may be sufficient as sub CC allocated.
  • the LTE-A compatible terminal 103B having an operable system frequency bandwidth of 60 MHz is assigned four 10 MHz sub CCs (801, 802, 808, 809) in addition to the 20 MHz main CC (805). .
  • Other sub CC combinations may be used. The same applies to the LTE-A compatible terminals 103 (C, D).
  • the transmitting / receiving unit 1010 of the base station 101 transmits contention resolution information (downlink control signaling, Contention Resolution, RACH message D), which is information during the random access process (504).
  • contention resolution information downlink control signaling, Contention Resolution, RACH message D
  • the access control / scheduling unit 1011 of the base station 101 performs resource allocation of CC allocation information to the LTE-A compatible terminal 103 in the first scheduling subframe through the PDCCH of the main CC, and performs scheduling information ( (Point, size, etc. information indicating the resource of CC allocation information) is transmitted (505). Further, the access control / scheduling unit 1011 performs higher layer signaling to the CC allocation information resource through the main CC, and transmits the CC allocation information of the LTE-A compatible terminal 103 (506).
  • the PDCCH detection unit 1034 of the LTE-A compatible terminal 103 performs scheduling information on resources of CC allocation information in the PDCCH in the main CC (information such as points and sizes indicating the resources of the CC allocation information) ) To read the PDSCH data corresponding to the downlink data shared channel (PDSCH: PhysicalPhysDownlink Shared Channel) resource, and obtain the CC allocation information.
  • PDSCH PhysicalPhysDownlink Shared Channel
  • the LTE-A compatible terminal 103 operates in the assigned CC in the scheduling subframe subsequent to the first scheduling subframe.
  • the filter adjustment unit 1032 adjusts the parameters of the filter based on the acquired CC allocation information so that the information from the base station 101 can be suitably received.
  • the CC assignment information includes CC (CC center frequency, CC number, etc.) information including a plurality of CCs assigned to the LTE-A compatible terminal 103 and PDCCH.
  • the common search area (Common Search Space) in the PDCCH is arranged in the main CC.
  • the common search area in the LTE-A PDCCH can be used in multiple.
  • an LTE-A PDCCH common search area can be newly defined in the main CC.
  • FIG. 6 is an explanatory diagram showing a state when the PDCCH is distributed to the LTE-A compatible terminal 103.
  • FIG. 6A is a diagram illustrating a CC to which a PDCCH is allocated
  • FIG. 6B is a flowchart illustrating a flow of detecting a PDCCH.
  • the base station 101 allocates a specific CC to the LTE-A compatible terminal 103 by a specified calculation method, and performs LTE PDCCH distribution in the specific CC.
  • the PDCCH detection unit 1034 of the LTE-A compatible terminal 103 performs rearrangement processing on the sub CCs within the corresponding operating system frequency bandwidth.
  • the rearrangement processing refers to rearranging the CC processing procedures according to a certain rule, for example, rearrangement processing in the order of CC numbers.
  • the sub CCs (601 to 603) shown in (a) of FIG. 6 are the results of rearrangement in the order of the sub CCs 601, 602, and 603 by the rearrangement process. Also, the flow of performing PDCCH detection in this order is shown in FIG.
  • the PDCCH detection unit 1034 performs LTE PDCCH blind detection in the newly defined downlink control information (DCI) format based on the rearranged order (S611). Specifically, first, PDCCH detection is performed on the sub CC (601) (S612), and if no PDCCH is detected (not detected in S612), detection is performed on the next sub CC (602). (S613). When the PDCCH is not detected in the sub CC (602) (not detected in S613), the PDCCH is detected in the next sub CC (603) (S614). In this way, the operation continues until the detection of PDCCH in all the sub CCs (601 to 603) is completed.
  • DCI downlink control information
  • the PDCCH detection is terminated at that time ( S615).
  • the PDCCH detection is terminated as it is (S615).
  • the flow at this time is shown by a broken line in FIG.
  • the present invention is not limited to this.
  • the PDCCH includes all resource allocation information in the operating system frequency bandwidth of the LTE-A compatible terminal 103.
  • the PDCCH in each sub CC includes corresponding PDSCH related information in the CC in the format of downlink control information (DCI) by a method compatible with LTE.
  • DCI downlink control information
  • FIG. 7 is a schematic diagram of channel mapping in LTE-A.
  • the vertical axis represents frequency and the horizontal axis represents time.
  • LTE-A includes a 20 MHz main CC (703) and a 10 MHz sub CC (701, 702, 704, 705).
  • four sub CCs are shown, it is not restricted to this.
  • the number of sub CCs is changed according to the operating system frequency bandwidth.
  • the main CC (703) and the sub CCs (701, 702, 704, 705) all include the PDCCH in the first symbol. Further, the common search area 706 is included in the PDCCH of the main CC.
  • a symbol next to the symbol including the PDCCH of the main CC (703) includes an area 707 including BCH / SCH and BCH-A.
  • the LTE compatible terminal 102 and the LTE-A compatible terminal 103 both access the mobile communication system 100 to which LTE-A is appropriately applied, and LTE- A high-speed data service provided by A can be received. Further, the above-described design is simple and highly efficient, is not complicated in design, and satisfies the requirements of user devices.
  • each block of the base station 101 and the LTE-A compatible terminal 103 in particular, the transmission / reception unit 1010 of the base station 101, the access control / scheduling unit 1011, the determination unit 1012, and the transmission / reception unit 1030 of the LTE-A compatible terminal 103,
  • the random access unit 1031, the filter adjustment unit 1032, the information acquisition unit 1033, and the PDCCH detection unit 1034 may be configured by hardware logic, or realized by software using a CPU (central processing unit) as follows. Also good.
  • the base station 101 and the LTE-A compatible terminal 103 include a CPU that executes instructions of a control program for realizing each function, a ROM (read only memory) that stores the program, and a RAM (random access memory) that develops the program. ),
  • a storage device such as a memory for storing the program and various data.
  • the object of the present invention is to enable a computer to read program codes (execution format program, intermediate code program, source program) of control programs for the base station 101 and the LTE-A compatible terminal 103, which are software for realizing the functions described above.
  • the computer or CPU or MPU (microprocessor unit)
  • Examples of the recording medium include a tape system such as a magnetic tape and a cassette tape, a magnetic disk such as a floppy (registered trademark) disk / hard disk, a CD-ROM (compact disk-read-only memory) / MO (magneto-optical) / Disc system including optical disc such as MD (Mini Disc) / DVD (digital versatile disc) / CD-R (CD Recordable), card system such as IC card (including memory card) / optical card, or mask ROM / EPROM ( A semiconductor memory system such as erasable, programmable, read-only memory, EEPROM (electrically erasable, programmable, read-only memory) / flash ROM, or the like can be used.
  • a tape system such as a magnetic tape and a cassette tape
  • a magnetic disk such as a floppy (registered trademark) disk / hard disk
  • the base station 101 and the LTE-A compatible terminal 103 may be configured to be connectable to a communication network, and the program code may be supplied via the communication network.
  • the communication network is not particularly limited.
  • the Internet an intranet, an extranet, a LAN (local area network), an ISDN (integrated services network, digital network), a VAN (value-added network), and a CATV (community antenna) television communication.
  • a network, a virtual private network, a telephone line network, a mobile communication network, a satellite communication network, etc. can be used.
  • the transmission medium constituting the communication network is not particularly limited.
  • IEEE institute of electrical and electronic engineering
  • USB power line carrier
  • cable TV line cable TV line
  • telephone line ADSL (asynchronous digital subscriber loop) loop Wireless
  • IrDA infrared data association
  • remote control Bluetooth (registered trademark)
  • 802.11 wireless high data rate
  • mobile phone network satellite line, terrestrial digital network, etc.
  • the present invention can also be realized in the form of a computer data signal embedded in a carrier wave in which the program code is embodied by electronic transmission.
  • a communication device that supports only LTE can be compatible with a communication system to which LTE-A is applied, it is suitable for a communication system that supports LTE-A.
  • Mobile communication system (communication system) 101 Base station 102 LTE compatible terminal (communication terminal) 103 LTE-A compatible terminal (communication terminal) 1010 Transmission / reception unit (transmission means, reception means) 1011 Access control / scheduling unit (access control / scheduling means) 1030 Transmission / reception unit (transmission / reception means) 1034 PDCCH detector (PDCCH detector)

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système de communication mobile (100) qui prend en charge un terminal de communication LTE (102) et un terminal de communication LTE-A (103). La largeur de bande de fréquences du système de communication mobile (100) est divisée en une bande de fréquences principale et une ou plusieurs sous-bandes de fréquences. Lorsqu'une station de base (101) reçoit des informations de largeur de fonctionnement indiquant une largeur de bande de fréquences opérationnelle du terminal de communication (102, 103) depuis le terminal de communication (102, 103), la station de base (101) définit la bande de fréquences principale et une sous-bande de fréquences sélectionnée par la station de base(101) comme la bande de fréquences de fonctionnement du terminal de communication vers le terminal de communication (102, 103), détermine, en dehors de la bande de fréquences de fonctionnement définie, une sous-bande de fréquences à laquelle un PDCCH est attribué, et attribue le PDCCH du LTE à la sous-bande de fréquences déterminée.
PCT/JP2009/064069 2008-08-07 2009-08-07 Station de base, terminal de communication, système de communication, procédé de commande de station de base, procédé de commande de terminal de communication, procédé de commande de système de communication, programme de commande et support d'enregistrement WO2010016596A1 (fr)

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