WO2011125701A1 - 基地局装置及びユーザ端末 - Google Patents
基地局装置及びユーザ端末 Download PDFInfo
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- WO2011125701A1 WO2011125701A1 PCT/JP2011/057954 JP2011057954W WO2011125701A1 WO 2011125701 A1 WO2011125701 A1 WO 2011125701A1 JP 2011057954 W JP2011057954 W JP 2011057954W WO 2011125701 A1 WO2011125701 A1 WO 2011125701A1
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- control information
- downlink control
- search space
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- frequency block
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- 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) or DMT
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- 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) or DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
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- 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 signalling, i.e. of overhead other than pilot signals
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- 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—Signalling for the administration of the divided path, e.g. signalling of configuration information
- H04L5/0096—Indication of changes in allocation
- H04L5/0098—Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to a wireless communication system in which a plurality of fundamental frequency blocks (hereinafter referred to as “component carriers”) are allocated dynamically or semi-statically for communication, and in particular, a downlink control channel is transmitted and received under carrier aggregation.
- component carriers fundamental frequency blocks
- the present invention relates to a base station apparatus and a user terminal.
- the W-CDMA standardization organization 3GPP defines the communication method that succeeds W-CDMA (Wideband Code Division Multiple Access) and HSDPA (High Speed Downlink Packet Access), that is, Long Term Evolution (LTE).
- W-CDMA Wideband Code Division Multiple Access
- HSDPA High Speed Downlink Packet Access
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single-Carrier Frequency Division Multiple Access
- the LTE system is a system in which one or two or more physical channels are shared by a plurality of mobile stations UE for both uplink and downlink.
- a channel shared by a plurality of mobile stations UE is generally called a shared channel (or may be called a data channel).
- it is a PUSCH (Physical Uplink Shared Channel) in the uplink and in the downlink.
- PDSCH Physical Downlink Shared Channel
- a PDCCH Physical Downlink Control Channel
- the mobile station UE receives the PDCCH, performs blind decoding, and takes in downlink control information addressed to itself.
- a search space that defines a resource range in which the mobile station should perform blind decoding is defined.
- the base station performs signaling by arranging downlink control information addressed to the mobile station in the search space.
- the mobile station UE does not subject the entire range of the PDCCH to blind decoding, but performs blind decoding limited to the search space in the PDCCH, and acquires downlink control information addressed to the mobile station UE.
- An object of the present invention is to provide a base station apparatus and a user terminal that realizes a search space configuration suitable for transmission / reception of a downlink control channel in a communication system in which a plurality of component carriers are gathered to increase the bandwidth.
- the base station apparatus includes a selection unit that selects a downlink and uplink system band used for radio communication with a user terminal in units of component carriers, and data that is individually transmitted by the selected component carrier.
- Downlink control information for demodulating each channel is generated, and the downlink control information of a plurality of component carriers is aggregated in the downlink control channel of a specific component carrier among the plurality of component carriers constituting the system band.
- Downlink control information generating means for arranging the search space, and transmitting means for transmitting the downlink control channel in which downlink control information is aggregated and arranged in the search space by the downlink control information generating means. It is characterized by that.
- LTE-A shows the hierarchical bandwidth structure defined by LTE-A. It is a conceptual diagram of the user separate search space prescribed
- FIG. 1 is an overall view of a mobile communication system according to an embodiment. It is a schematic block diagram of the base station apparatus which concerns on embodiment. It is a schematic block diagram of the mobile terminal device which concerns on an Example. It is a functional block diagram of the transmission processing part in the baseband signal processing part of the base station apparatus which concerns on an Example. It is a functional block diagram of the baseband signal processing part which the mobile terminal apparatus which concerns on an Example has.
- carrier aggregation for configuring a system band by adding or deleting a plurality of component carriers is performed.
- the carrier aggregation will be described with reference to FIG.
- FIG. 1 is a diagram showing a hierarchical bandwidth configuration agreed upon in LTE-A.
- the example shown in FIG. 1 includes an LTE-A system that is a first mobile communication system having a first system band composed of a plurality of component carriers (CC), and a second system band composed of one component carrier.
- This is a hierarchical bandwidth configuration when an LTE system, which is a second mobile communication system, is present.
- wireless communication is performed with a variable system bandwidth of a maximum of 100 MHz
- wireless communication is performed with a variable system bandwidth of a maximum of 20 MHz.
- the system band of the LTE-A system includes at least one component carrier having the system band of the LTE system as a unit, and the number of component carriers is added or deleted dynamically or semi-statically. In this way, collecting a plurality of component carriers to increase the bandwidth is called carrier aggregation.
- a mobile station UE (User Equipment) # 1 is a user terminal that supports the LTE-A system (also supports the LTE system) and can support a system band up to 100 MHz.
- UE # 3 is a user terminal compatible with the LTE system (not compatible with the LTE-A system), and can support a system band up to 20 MHz (base band).
- the present inventor has reached the present invention by considering a search space arrangement that realizes optimal PDCCH transmission / reception when a plurality of component carriers are aggregated in the LTE-A system.
- One aspect of the present invention is that, when a system band is configured with a plurality of component carriers in an LTE-A system, a search space of the plurality of component carriers configuring the system band is mapped to a downlink control channel of one component carrier . You may map the search space of all the component carriers to one component carrier. Alternatively, a plurality of component carriers constituting the system band may be divided into a plurality of groups, and the search space of the plurality of component carriers in the same group may be mapped to one component carrier in the same group for each group. .
- Fig. 2 shows a conceptual diagram of the user-specific search space (UE-Specific Search Space) SS defined in LTE. Two search spaces having different blind decoding sizes are defined.
- the blind decoding size is determined according to the size (DCI size) of downlink control information (DCI), and the DCI size is determined by the transmission mode and bandwidth in the component carrier. If the transmission modes are the same between the aggregated component carriers, the DCI size is determined by the bandwidth of the component carrier.
- DCI size downlink control information
- LTE defines a plurality of DCI formats with different DCI sizes, in other words, different types of blind decoding.
- DCI Format 1 (indicated as “D0” in FIG. 2)
- DCI Format 1A which is a compact DCI format mainly used for users at the cell edge by compacting “D0”. (Denoted as “D0 ′” in FIG. 2).
- DCI Format 0 (denoted as “U0” in FIG. 2) having the same size as DCI Format 1A, which is a DCI format for downlink compact allocation, is defined.
- DCI Format 1 (D0) is arranged in the search space SS1
- D0 ′ and U0 are arranged in the common search space SS2 because they have the same bit size.
- DCI (Format 1) arranged in the search space SS1 is a control signal for PDSCH demodulation of the component carrier CC0
- DCI (Format 0) arranged in the search space SS2 is for uplink PUSCH demodulation of the same component carrier CC0. Control signal.
- FIG. 2A is an example in which downlink allocation information (D0) is arranged in one search space SS1, and uplink allocation information (U0) is arranged in the other search space SS2.
- FIG. 2B shows a case where DCI Format 1A, which is a DCI format for compact allocation, is selected as downlink allocation information, and “D0 ′” and “U0” are arranged in a common search space SS2.
- a configuration for mapping search spaces of a plurality of component carriers constituting a system band to a downlink control channel of one component carrier will be described with reference to FIGS.
- all the component carriers have the same bandwidth, and the downlink component carrier and the uplink component carrier have a symmetric relationship.
- FIG. 3 shows a system band composed of four component carriers CC0 to CC3, which are arranged on the PDCCH of the downlink component carrier (DL), the uplink component carrier (UL), and the downlink component carrier.
- a search space SS is shown.
- An example in which search spaces are arranged in accordance with the LTE regulations illustrated in FIG. 2 is shown in FIG. 3A.
- search spaces SS1 and SS2 are arranged on the PDCCH of each downlink component carrier (DL).
- FIG. 3B shows a configuration in which search spaces of a plurality of component carriers CC0 to CC3 are mapped to PDCCH0 of one component carrier CC0.
- one search space SS1 mapped to PDCCH0 downlink allocation information D0 to D3 of all component carriers CC0 to CC3 is arranged.
- uplink allocation information U0 to U3 of all component carriers CC0 to CC3 is arranged in the other search space SS2 mapped to PDCCH0.
- the compact uplink allocation information D0 ′ to D3 ′ is used, the compact downlink allocation information D0 ′ to D3 ′ and the uplink allocation information U0 to U3 are arranged in the search space SS2.
- DCI Format 1 / 1A where downlink allocation information (D0 to D3) / (D0 'to D3') is arranged, the original component carrier (each downlink allocation information (D0 to D3) / (D0 'to D3' ) Is used to add an identifier (hereinafter referred to as “carrier indicator”) that can identify a component carrier on which a shared data channel (PDSCH) that is demodulated is transmitted.
- carrier indicator an identifier
- a field in which a carrier indicator is arranged on DCI Format 1 / 1A can be called a CIF (Carrier Indicator Field).
- DCI Format 0 in which the uplink allocation information U0 to U3 is arranged is provided with a CIF indicating the original component carrier.
- a user terminal that has received PDCCH0 of component carrier CC0 performs blind decoding on search space SS1 of PDCCH0, D0 to D3 are demodulated simultaneously by one blind decoding, but are provided in individual D0 to D3. It is possible to determine which component carrier downlink allocation information is obtained by analyzing the CIF.
- U0 to U3 are simultaneously demodulated by one blind decoding, but if the CIF of U0 to U3 is analyzed, the uplink allocation information of any component carrier Can be determined.
- FIG. 4 shows a system band composed of four component carriers CC0 to CC3, and shows an example in which a plurality of component carriers constituting the system band are divided into a plurality of groups and a search space is mapped in units of groups.
- FIG. 4A shows the same contents as FIG. 3A.
- FIG. 4B shows an example in which search spaces of a plurality of component carriers in the same group are mapped to one component carrier in the same group for each group.
- the entire system band is divided into a first group of component carriers CC0 and CC1 and a second group of component carriers CC2 and CC3.
- the search spaces of the multiple component carriers CC0 and CC1 in the first group are mapped to the PDCCH0 of the single component carrier CC0 in the same group, and the search spaces of the multiple component carriers CC2 and CC3 in the second group are mapped to the same group.
- the uplink / downlink allocation information that is important information Can be signaled using PDCCH0 of component carrier CC0 with good communication quality.
- the component carriers are divided into several groups, and the component carriers used for transmission of downlink control information in the group are specified, whereby the number of component carriers (DCI) arranged in one search space. Increase in number (which may be paraphrased as a number) can be suppressed.
- FIG. 5 shows a system band composed of four component carriers CC0 to CC3.
- the two component carriers CC0 and CC1 have the same bandwidth, and the remaining two component carriers CC2 and CC3 are the same.
- the bandwidth is different from CC0 and CC1.
- the uplink component carrier and the downlink component carrier are symmetric.
- the search space arrangement shown in FIG. 5A is the same as that shown in FIGS. 3A and 4A.
- downlink allocation information D0 and D1 of component carriers CC0 and CC1 having the same bandwidth since they are the same size, as shown in FIG. 5B, a shared search space SS1 (D0 / 1) for CC0 and CC1 is configured in the search space SS1 for CC0. Further, since the downlink allocation information D2 and D3 of the component carriers CC2 and CC3 having the same bandwidth are the same size, as shown in FIG. 5B, the search space SS1 includes the shared search space SS1 (D2 / D2) for CC2 and CC3. 3) is configured. Accordingly, two shared search spaces SS1 (D0 / 1) and SS1 (D2 / 3) coexist in the search space SS1 for downlink allocation information.
- the shared search space SS2 (U0 / 1) for CC0 and CC1 is configured in the search space SS2.
- the uplink allocation information U2 and U3 of the component carriers CC2 and CC3 have the same size, as shown in FIG. 5B, a shared search space SS2 (U2 / 3) for CC2 and CC3 is configured in the search space SS2. Therefore, two shared search spaces SS2 (U0 / 1) and SS2 (U2 / 3) coexist in the search space SS2 for uplink allocation information.
- compact type D0 ′ / D1 ′ and D2 ′ / D3 ′ having the same DCI size may be arranged.
- C represents CIF added to the downlink allocation information (D0, D1, D2, D3) and the uplink allocation information (U0, U1, U2, U3), respectively.
- one component carrier may be determined as an anchor carrier.
- the anchor carrier can be defined to always compensate for the same operation as LTE.
- CIF cannot be included in the DCI format.
- a specific component carrier is defined as a reference component carrier (anchor carrier) and the reference component carrier is recognized together between the base station apparatus and the user terminal, the reference component carrier The component carrier can be specified without adding CIF to the DCI of the carrier.
- FIG. 5C shows a search space arrangement when no CIF is added to the downlink assignment information D0 and the uplink assignment information U0 of the component carrier CC0. Since the CIF is deleted from the DCI of the component carrier CC0, the DCI sizes of D0 / D0 ′ and D1 / D1 ′ are different. Similarly, the DCI sizes of U0 and U1 are different.
- the search space arrangement shown in FIG. 5C has a configuration in which search spaces are separated for each DCI size.
- Search space SS1 in which downlink allocation information is arranged includes search space SS1 (D0) in which D0 without CIF is arranged, search space SS1 (D1) in which D1 with CIF is arranged, and D2 and D3 of the same size with CIF.
- the shared search space SS1 (D2 / 3) is arranged.
- Search space SS2 in which uplink allocation information is arranged includes search space SS2 (U0) in which U0 without CIF is arranged, search space SS2 (U1) in which U1 with CIF is arranged, U2 and U3 of the same size with CIF.
- the shared search space SS2 (U2 / 3) is arranged.
- FIG. 6 shows a system band composed of four component carriers CC0 to CC3. Two component carriers CC0 and CC1 have the same bandwidth, and the remaining two component carriers CC2 and CC3 are the same. The bandwidth is different from CC0 and CC1. Note that the search space arrangement shown in FIG. 6A is the same search space arrangement as FIG. 5A.
- the downlink allocation information D0 and D1 of the component carriers CC0 and CC1 having the same bandwidth is arranged in the search space SS1 / 2 of the PDCCH0 of the component carrier CC0 and has the same bandwidth as shown in FIGS. 6B and 6C.
- the downlink assignment information D2 and D3 of the component carriers CC2 and CC3 are arranged in the search space SS1 / 2 of the PDCCH2 of the component carrier CC2, as shown in FIGS. 6B and 6C.
- FIG. 6B shows search space arrangement when CIF is added to all downlink allocation information D0 to D3 (D0 ′ to D3 ′) and uplink allocation information U0 to U3.
- a shared search space SS1 (D0 / 1) for CC0 and CC1 is arranged in the search space SS1 of PDCCH0, and a shared search space SS1 (D2 / 3) for CC2 and CC3 is arranged in the search space SS1 of PDCCH2.
- a shared search space SS2 (U0 / 1) for CC0 and CC1 is arranged in the search space SS2 of PDCCH0
- a shared search space SS2 (U2 / 3) for CC2 and CC3 is arranged in the search space SS2 of PDCCH2.
- FIG. 6C is the same as the search space configuration shown in FIG. 6B in that search spaces SS1 and SS2 are aggregated in anchor carriers CC0 and CC2 (which may be referred to as reference component carriers) of each group.
- the difference is that CIF is not added to the allocation information D0 and U0 of the anchor carrier CC0.
- a configuration may be adopted in which CIF is not added to the allocation information D2 and U2 of the other anchor carrier CC2, and in this case, a configuration similar to the search space of the allocation information D0 and U0 of one anchor carrier CC0 is desirable.
- the DCI size of the uplink allocation information matches the DCI size of the compact type downlink allocation information (DCI Format 1A).
- DCI Format 1A the DCI size of the compact type downlink allocation information
- LTE-A it has been agreed to allocate a plurality of clusters to the uplink radio access scheme and adopt clustered DFT spread OFDM.
- clustered DFT spread OFDM the amount of information of uplink resource allocation information is large, so a DCI size larger than DCI Format 1A is desirable.
- LTE-A it has been agreed to apply MIMO transmission to the uplink, and uplink resource allocation information increases from that viewpoint.
- DCI Format 0A In addition to DCI Format 0 that matches the DCI size of the compact type downlink allocation information (DCI Format 1A), the DCI format (hereinafter referred to as “DCI Format 0A”) has an expanded number of resource allocation bits than DCI Format 0. ) Is defined. A search space for placing DCI Format 0A is set in PDCCH.
- Another aspect of the present invention is that a search space corresponding to three DCI sizes of DCI Format 1, DCI Format 0 / 1A, and DCI Format 0A is arranged in the PDCCH in the LTE-A system, and the user terminal has three types of DCI. Format is blind-decoded.
- Fig. 7 shows the system bandwidth configuration and search space arrangement in which three types of search spaces are arranged.
- the figure shows a system band composed of four component carriers CC0 to CC3, the two component carriers CC0 and CC1 have the same bandwidth, and the remaining two component carriers CC2 and CC3 are the same. Which has a bandwidth different from CC0 and CC1.
- Three types of search spaces SS1, SS2, and SS3 are arranged on the PDCCHs of the individual component carriers CC0 to CC3, respectively.
- the search space arranged on the PDCCH of the component carrier CC0 will be described as an example.
- the first search space SS1 in which the DCI Format 1 downlink allocation information D0 having the first DCI size is arranged, and the DCI Format 1A or DCI Format 0 downlink allocation information D0 ′, U0 ′ having the second DCI size are arranged.
- the third search space SS3 in which the uplink allocation information U0 of the DCI Format 0A having the third DCI size is arranged in the PDCCH.
- the downlink allocation information D0 ′ and the uplink allocation information U0 ′ are not arranged in the second search space SS2, but when a downlink control signal is signaled to a user terminal at the cell edge or a user terminal with little control information. Are assigned downlink allocation information D0 ′ and uplink allocation information U0 ′ to the second search space SS2.
- the second search space is utilized when it is desired to reduce the information amount of the downlink control signal as in the case of the cell edge user as in the case of LTE.
- the third search space can be used for signaling.
- only the anchor carrier (CC0) may support the fallback to the mode (DCI Format 1A or DCI Format 0) using the second search space.
- Component carriers (CC1 to CC3) other than the anchor carrier (CC0) do not perform blind decoding of the second search space in the user terminal. If a band with good communication quality is allocated to the anchor carrier (CC0), the second search space having a small DCI size can be used effectively, and two types of blind decoding can be performed except for the anchor carrier (CC0). Can reduce the load.
- asymmetric component carriers hereinafter referred to as “asymmetric component carriers” in which only downlink component carriers are allocated and uplink component carriers are not allocated
- FIG. 9 shows a system band including an asymmetric component carrier and a search space arrangement.
- One component carrier CC0 has an uplink component carrier and a downlink component carrier assigned in pairs, while the other component carrier CC1 has only a downlink component carrier assigned and is an uplink component carrier. It constitutes an asymmetric component carrier in which no carrier exists.
- a second search space SS2 for a compact size to which uplink assignment information U0 (DCI Format 0) of the same size can be assigned in pairs is arranged in the PDCCH.
- the asymmetric component carrier CC1 only the compact size downlink allocation information D1 ′ exists with respect to the downlink allocation information D1 as information to be arranged in the second search space SS2 for compact size.
- the search space for the asymmetric component carrier is assigned downlink assignment information D1 (DCI Format 1).
- DCI Format 1 downlink assignment information
- Search space SS1 and the second search space SS2 for compact size in which only the compact size downlink allocation information D1 ′ (DCI Format 0) is arranged with respect to the downlink allocation information D1. That is, the second search space SS2 for compact size does not perform allocation in pairs of downlink allocation information (DL) for downlink component carriers and uplink allocation information (UL) for uplink component carriers.
- Only compact type downlink allocation information D1 ′ (DCI Format 1A) for the component carrier is arranged (option 2).
- uplink allocation information (UL) of other component carriers having different bandwidths is allocated. If a pair is formed by using this, an operation of matching the size of the compact type downlink allocation information in the asymmetric component carrier with the uplink allocation information (UL) in the other component carrier occurs. According to the present invention, such work can be prevented from occurring.
- the second search space SS2 for compact size may be eliminated from the search space for the asymmetric component carrier (option 3).
- a pair may be configured using uplink allocation information of component carriers other than the asymmetric component carrier (for example, uplink allocation information U0 of component carrier CC0) (option 1).
- uplink allocation information of component carriers other than the asymmetric component carrier for example, uplink allocation information U0 of component carrier CC0
- U0 uplink allocation information
- FIG. 10 shows a specific example of the above options 1 to 3.
- a configuration example of the compact second search space SS2 for the asymmetric component carrier CC1 illustrated in FIG. 9 is shown.
- a second search space SS2 is defined in which the compact type downlink allocation information D1 ′ of the asymmetric component carrier CC1 and the uplink allocation information U0 of the component carrier CC0 other than the asymmetric component carrier CC1 can be arranged as a pair. .
- the uplink allocation information U0 of the component carrier CC0 has a larger bit size than the compact type downlink allocation information D1 ′ of the asymmetric component carrier CC1.
- a padding bit is added to the smaller downlink allocation information D1 ′.
- the bit size is matched with the larger uplink allocation information U0.
- the uplink allocation information U0 of the component carrier CC0 can be signaled using the second search space of another component carrier CC1, and the redundancy of the uplink allocation information U0 can be increased.
- the uplink allocation information UL is diverted from another component carrier having the same bandwidth (the same transmission mode) as the asymmetric component carrier CC1, the compact type downlink allocation information D1 ′ and the uplink allocation information UL have the same size, The work of adding padding bits is unnecessary.
- Option 2 defines a second search space SS2 for a compact size in which only the compact type downlink allocation information D1 ′ of the asymmetric component carrier CC1 is arranged. Since uplink allocation information U0 (CC0) having different bit sizes from other component carriers is not diverted, no padding bit addition work for matching both bit sizes occurs, and the processing can be simplified.
- the second search space SS2 for compact size is not arranged on the asymmetric component carrier. As a result, it is possible to realize processing that is further simplified as compared to option 2.
- downlink control information In LTE, downlink control information (DCI) is rate-matched to 72, 144, 288, or 576 bits depending on the reception quality of the user terminal (in the case of 72 bits or 576 bits, the coding rate is 2/3, Equivalent to 1/12).
- a user terminal with better reception quality has a smaller number of CCE aggregation, and a user terminal with lower reception quality, such as a user terminal at the cell edge, increases the number of CCE aggregation.
- the number of CCE aggregations (resources) for transmitting downlink control information (DCI) is determined for each user terminal.
- FIG. 11 shows an example in which the PDCCH of the component carrier is configured with 50 CCEs.
- the present inventor can control an appropriate search space arrangement according to the number of component carrier aggregations, and has an affinity for appropriately switching the search space arrangement when the PDSCH is activated / deactivated.
- PDSCH inactivation refers to controlling the transmission power of PDSCH to 0 or a value close to 0, or controlling the transmission data of PDSCH to 0 or minimum information.
- the activation of PDSCH means that PDSCH transmission power or transmission data is set to a predetermined level or higher.
- the component carrier that transmits the PDCCH is continuously arranged with reference to the start position of the search space.
- the search space for each component carrier can be specified in the user terminal.
- search spaces are arranged in units of component carriers, it is easy to deactivate only the search spaces of component carriers in which PDSCH is deactivated.
- the search space mapping in which the search spaces for the component carriers are continuously arranged based on the start position of the search space of the component carrier that transmits the PDCCH will be specifically described.
- the component carrier that sends the PDCCH is CC1, and the PDCCH of the component carrier CC1 is configured with a bandwidth of 50 CCE.
- Search spaces for other component carriers CC2 and CC3 are arranged on the PDCCH of the component carrier CC1.
- the search space is composed of 6 CCEs.
- the search space is composed of 2 CCEs.
- the component carrier that transmits the PDCCH starts from the CCE number 17 in the search space of CC1.
- the search space of CC2 is arranged following the search space of CC1
- the search space of CC3 is arranged following the search space of CC2. The same applies to the case of another number of CCE aggregations.
- each search can be performed even if multiple CC search spaces are arranged in the 1CC PDCCH. Space can be specified. Since the size of the search space is determined by the number of CCE aggregations, it is not necessary to separately signal the search space size. Then, the user terminal only searches for the CC number for sending the PDCCH (in this case, CC1) and the CC number for sending the PDSCH (in this case, CC2, CC3), and the user terminal searches for each component carrier (CC1 to CC3). You can identify the space.
- FIG. 12B shows the search space arrangement when CC2 is deactivated.
- CC2 downlink control information may be arranged in the original CC2 search space (CCE numbers 23 to 28).
- the search space arrangement in which search spaces of a plurality of component carriers are continuously arranged can easily cope with activation / deactivation of PDSCH.
- the number of CCEs constituting the search space may not be increased in proportion to the number of component carriers. If the DCI sizes of a plurality of component carriers are the same, the number of CCEs need not be increased in proportion to the number of component carriers.
- FIG. 13 is a diagram showing a search space configuration of component carriers having the same DCI size.
- Ncc the number of CCs
- Ncc 1 CCE
- FIG. 14 shows an example in which the search space SS is partially overlapped between the component carriers CC by giving an offset specific to the component carrier CC to the search space SS.
- the search space reserved for the PDCCH is in the range of CCE numbers 17-34.
- the search space size increases in proportion to the increase in the number of CC aggregations, but by adding an offset specific to the component carrier to the search space, the increase in the search space size when the number of CC aggregations increases. It can be suppressed.
- the number of CCEs corresponding to the bandwidth of the PDCCH is N CCE
- the number of CCs is Ncc.
- N CCE is smaller than N_size ⁇ Ncc, the number of CCEs is insufficient, and the following offset amount N_offset is calculated.
- the unit of offset is the number of search spaces SS at each level.
- N_level 2 and 8
- N_size ⁇ Ncc 60 and 80 (> 41), respectively, so the offset is calculated using the above equation.
- FIG. 15 shows the search space of each component carrier when this offset is applied.
- the PDSCH transmission power is reduced or deactivated to zero for the purpose of power saving. Even when the PDSCH is deactivated, only the PDCCH is activated (maintaining transmission of downlink control information with a required transmission power).
- the PDCCH of the component carrier is also provided with an ON / OFF function for activating / deactivating.
- the PDCCH of that component carrier CC_N is also deactivated.
- PDSCH is turned on (activated) only for a certain component carrier CC_N, but PDCCH can be turned off.
- FIG. 16 is a diagram for explaining the configuration of the mobile communication system 1 including the mobile station 10 and the base station 20 according to the present embodiment.
- the mobile communication system 1 shown in FIG. 16 is a system including, for example, an LTE system or SUPER 3G.
- the mobile communication system 1 may be called IMT-Advanced or 4G.
- the mobile communication system 1 includes a base station device 20 and a plurality of mobile terminal devices 10 (10 1 , 10 2 , 10 3 ,... 10 n , n communicating with the base station device 20. Is an integer of n> 0).
- the base station apparatus 20 is connected to the higher station apparatus 30, and the higher station apparatus 30 is connected to the core network 40.
- the mobile terminal apparatus 10 can communicate with the base station apparatus 20 in the cell 50.
- the upper station apparatus 30 includes, for example, an access gateway apparatus, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto.
- the upper station apparatus 30 may be included in the core network 40.
- Each mobile terminal device (10 1 , 10 2 , 10 3 ,... 10 n ) includes an LTE terminal and an LTE-A terminal.
- the mobile terminal device 10 will be described unless otherwise specified. Proceed. For convenience of explanation, it is assumed that the mobile terminal device 10 is in radio communication with the base station device 20, but more generally, user equipment (UE: User Equipment) including both the mobile terminal device and the fixed terminal device. It's okay.
- UE User Equipment
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier-frequency division multiple access
- clustered DFT spread OFDM are applied to the uplink as the radio access scheme. Is done.
- OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier.
- SC-FDMA is a single carrier transmission method that reduces interference between terminals by dividing a system band into bands each consisting of one or continuous resource blocks for each terminal, and a plurality of terminals using different bands. .
- Clustered DFT spread OFDM assigns non-contiguous clustered subcarrier groups (clusters) to one mobile station UE, and applies discrete Fourier transform spread OFDM to each cluster, thereby providing uplink multiples. This is a method for realizing connection.
- the downlink communication channel includes PDSCH shared by each mobile terminal apparatus 10 and downlink L1 / L2 control channels (PDCCH, PCFICH, PHICH). User data and higher control signals are transmitted by this PDSCH.
- the upper control signal includes RRC signaling for notifying the mobile terminal apparatus 10 of addition / reduction of the number of carrier aggregations and an uplink radio access scheme (SC-FDMA / clustered DFT spread OFDM) applied to each component carrier. Including.
- SC-FDMA uplink radio access scheme
- SC-FDMA clustered DFT spread OFDM
- the uplink communication channel includes a PUSCH shared and used by each mobile terminal apparatus 10 and a PUCCH (Physical Uplink Control Channel) that is an uplink control channel.
- PUCCH Physical Uplink Control Channel
- User data is transmitted by this PUSCH.
- PUCCH transmits downlink radio quality information (CQI: Channel Quality Indicator), ACK / NACK, and the like, and intra-subframe frequency hopping is applied in SC-FDMA, but in intra-subframe frequency in clustered DFT spread OFDM. Since frequency scheduling effects can be obtained without hopping, intra-subframe frequency hopping is not applied.
- CQI Channel Quality Indicator
- the base station apparatus 20 includes a transmission / reception antenna 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, a call processing unit 205, and a transmission path interface 206.
- User data transmitted from the base station apparatus 20 to the mobile terminal apparatus 10 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 204 via the transmission path interface 206.
- the baseband signal processing unit 204 performs PDCP layer processing, user data division / combination, RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ (Hybrid Automatic Repeat reQuest) transmission processing, scheduling, transmission format selection, channel encoding, Inverse Fast Fourier Transform (IFFT) processing, and precoding processing are performed. Also, transmission processing such as channel coding and inverse fast Fourier transform is performed on the signal of the physical downlink control channel that is the downlink control channel.
- RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ (Hybrid Automatic Repeat reQuest) transmission processing, scheduling, transmission format selection, channel encoding, Inverse Fast Fourier Transform (IFFT) processing, and precoding processing are performed.
- transmission processing such as channel coding and inverse fast Fourier transform is
- the baseband signal processing unit 204 notifies the mobile terminal device 10 connected to the same cell 50 of the control information for each mobile terminal device 10 to wirelessly communicate with the base station device 20 through the broadcast channel.
- the broadcast information for communication in the cell 50 includes, for example, system bandwidth in the uplink or downlink, identification information (Root Sequence Index) of a root sequence for generating a random access preamble signal in the PRACH, and the like. included.
- the transmission / reception unit 203 frequency-converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band.
- the amplifier unit 202 amplifies the transmission signal subjected to frequency conversion and outputs the amplified transmission signal to the transmission / reception antenna 201.
- a radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202 and is frequency-converted by the transmission / reception unit 203 to be baseband.
- the signal is converted into a signal and input to the baseband signal processing unit 204.
- the baseband signal processing unit 204 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, RLC layer, PDCP layer reception processing on user data included in the baseband signal received in the uplink I do.
- the decoded signal is transferred to the higher station apparatus 30 via the transmission path interface 206.
- the call processing unit 205 performs call processing such as communication channel setting and release, state management of the base station device 20, and wireless resource management.
- the mobile terminal device 10 includes a transmission / reception antenna 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, and an application unit 105.
- a radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102, frequency-converted by the transmission / reception unit 103, and converted into a baseband signal.
- the baseband signal is subjected to FFT processing, error correction decoding, retransmission control reception processing, and the like by the baseband signal processing unit 104.
- downlink user data is transferred to the application unit 105.
- the application unit 105 performs processing related to layers higher than the physical layer and the MAC layer. Also, the broadcast information in the downlink data is also transferred to the application unit 105.
- uplink user data is input from the application unit 105 to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs retransmission control (H-ARQ (Hybrid ARQ)) transmission processing, channel coding, DFT processing, and IFFT processing.
- the transmission / reception unit 103 converts the baseband signal output from the baseband signal processing unit 104 into a radio frequency band. Thereafter, the signal is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101.
- H-ARQ Hybrid ARQ
- FIG. 19 is a functional block diagram of the baseband signal processing unit 204 and some upper layers included in the base station apparatus 20 according to the present embodiment.
- the baseband signal processing unit 204 is mainly a functional block of a transmission processing unit. Is shown.
- FIG. 19 exemplifies a base station configuration that can support the maximum number of M (CC # 1 to CC # M) component carriers. Transmission data for the mobile terminal apparatus 10 under the control of the base station apparatus 20 is transferred from the upper station apparatus 30 to the base station apparatus 20.
- M maximum number of M
- the control information generator 300 generates a higher control signal for higher layer signaling (for example, RRC signaling) for each user.
- the upper control signal can include a command for requesting addition / reduction of the component carrier CC.
- the data generation unit 301 outputs the transmission data transferred from the higher station apparatus 30 as user data for each user.
- the component carrier selection unit 302 selects a component carrier used for wireless communication with the mobile terminal device 10 for each user.
- the base station apparatus 20 notifies the mobile terminal apparatus 10 of addition / reduction of component carriers by RRC signaling, and receives a complete message from the mobile terminal apparatus 10.
- the assignment (addition / deletion) of the component carrier is confirmed for the user, and the confirmed assignment of the component carrier is set in the component carrier selection unit 302 as the component carrier assignment information.
- the upper control signal and transmission data are distributed to channel coding section 303 of the corresponding component carrier.
- SS aggregation component carrier a specific component carrier in which search spaces from a plurality of component carriers are aggregated is selected from among the component carriers used for wireless communication with the mobile terminal apparatus 10. .
- the scheduling unit 310 controls the allocation of component carriers to the subordinate mobile terminal devices 10 according to the communication quality of the entire system band.
- the scheduling unit 310 determines addition / deletion of a component carrier to be allocated for communication with the mobile terminal apparatus 10.
- the control information generation unit 300 is notified of the determination result regarding the addition / deletion of the component carrier.
- an SS aggregation component carrier is determined from among the component carriers selected for each user terminal.
- the SS aggregation component carrier may be switched dynamically or may be switched quasi-statically.
- the scheduling unit 310 controls resource allocation in each component carrier CC # 1 to CC # M. Scheduling is performed by distinguishing between LTE terminal users and LTE-A terminal users.
- the scheduling unit 310 receives transmission data and a retransmission instruction from the higher station apparatus 30 and receives a channel estimation value and a CQI of a resource block from a receiving unit that measures an uplink reception signal.
- the scheduling unit 310 performs scheduling of downlink allocation information, uplink allocation information, and upper and lower shared channel signals while referring to the retransmission instruction, channel estimation value, and CQI input from the higher station apparatus 30.
- the propagation path in mobile communication varies depending on the frequency due to frequency selective fading.
- adaptive frequency scheduling when transmitting user data to the mobile terminal apparatus 10, resource blocks with good communication quality are assigned to each mobile terminal apparatus 10 for each subframe (referred to as adaptive frequency scheduling).
- adaptive frequency scheduling a mobile terminal apparatus 10 with good channel quality is selected and assigned to each resource block. Therefore, the scheduling unit 310 allocates resource blocks that are expected to improve throughput using the CQI for each resource block fed back from each mobile terminal apparatus 10.
- the number of CEE aggregations is controlled according to the propagation path status with the mobile terminal apparatus 10. For cell edge users, the number of CEE aggregations is increased.
- an MCS coding rate, modulation scheme
- Parameters satisfying the MCS (coding rate, modulation scheme) determined by the scheduling unit 310 are set in the channel coding units 303, 308, 312 and the modulation units 304, 309, 313.
- the baseband signal processing unit 204 includes a channel encoding unit 303, a modulation unit 304, and a mapping unit 305 corresponding to the maximum user multiplexing number N in one component carrier.
- the channel coding unit 303 channel-codes a shared data channel (PDSCH) configured by user data (including some higher control signals) output from the data generation unit 301 for each user.
- the modulation unit 304 modulates channel-coded user data for each user.
- the mapping unit 305 maps the modulated user data to radio resources.
- the baseband signal processing unit 204 includes a downlink control information generation unit 306 that generates downlink shared data channel control information that is user-specific downlink control information, and a downlink common control channel control that is user-specific downlink control information. And a downlink common channel control information generating unit 307 that generates information.
- the downlink allocation information (D0) of DCI Format 1 is the downlink shared data channel control information.
- the downlink control information generation unit 306 is configured to use downlink control information (for example, DCI Format) composed of downlink allocation information from resource allocation information, MCS information, HARQ information, PUCCH transmission power control command, etc. determined for each user. 1) is generated.
- Downlink control information (for example, DCI Format 1) is arranged in the search space according to the present invention.
- the baseband signal processing unit 204 includes a channel encoding unit 308 and a modulation unit 309 corresponding to the maximum user multiplexing number N in one component carrier.
- the channel coding unit 308 channel-codes the control information generated by the downlink control information generation unit 306 and the downlink common channel control information generation unit 307 for each user.
- Modulation section 309 modulates channel-coded downlink control information.
- the baseband signal processing unit 204 includes an uplink control information generation unit 311 that generates, for each user, control information for uplink shared data channel that is control information for controlling the uplink shared data channel (PUSCH), and the generated uplink A channel coding unit 312 that performs channel coding of the shared data channel control information for each user, and a modulation unit 313 that modulates the channel-coded uplink shared data channel control information for each user.
- an uplink control information generation unit 311 that generates, for each user, control information for uplink shared data channel that is control information for controlling the uplink shared data channel (PUSCH), and the generated uplink A channel coding unit 312 that performs channel coding of the shared data channel control information for each user, and a modulation unit 313 that modulates the channel-coded uplink shared data channel control information for each user.
- PUSCH uplink shared data channel
- the downlink control information (U0) configured with the uplink allocation information of DCI Format 0 is the uplink shared data channel control information.
- the uplink control information generation unit 311 includes uplink resource allocation information (single carrier / cluster) determined for each user, MCS information and redundant version (RV), and an identifier (New Data Indicator) for distinguishing between new data and retransmission data. ), Uplink allocation information is generated from a PUSCH transmission power control command (TPC), a cyclic shift (CS for DMRS) of a demodulation reference signal, a CQI request, and the like.
- downlink control information configured with the uplink allocation information of DCI Format 0 is generated according to the rules defined in LTE.
- Downlink control information (for example, DCI Format 0) is arranged in the search space according to the present invention.
- the control information modulated for each user by the modulation units 309 and 313 is multiplexed by the control channel multiplexing unit 314 and further interleaved by the interleaving unit 315.
- the control signal output from the interleaving unit 315 and the user data output from the mapping unit 305 are input to the IFFT unit 316 as downlink channel signals.
- the IFFT unit 316 converts the downlink channel signal from a frequency domain signal to a time-series signal by performing inverse fast Fourier transform.
- the cyclic prefix insertion unit 317 inserts a cyclic prefix into the time-series signal of the downlink channel signal.
- the cyclic prefix functions as a guard interval for absorbing a difference in multipath propagation delay.
- the transmission data to which the cyclic prefix is added is sent to the transmission / reception unit 203.
- FIG. 20 is a functional block diagram of the baseband signal processing unit 104 included in the mobile terminal apparatus 10, and shows functional blocks of an LTE-A terminal that supports LTE-A. First, the downlink configuration of the mobile terminal apparatus 10 will be described.
- the CP is removed by the CP removal unit 401 from the downlink signal received from the radio base station apparatus 20 as reception data.
- the downlink signal from which the CP is removed is input to the FFT unit 402.
- the FFT unit 402 performs fast Fourier transform (FFT) on the downlink signal to convert it from a time domain signal to a frequency domain signal, and inputs it to the demapping unit 403.
- the demapping unit 403 demaps the downlink signal, and extracts multiplex control information, user data, and higher control signal in which a plurality of control information is multiplexed from the downlink signal. Note that the demapping process by the demapping unit 403 is performed based on a higher control signal input from the application unit 105.
- the multiplex control information output from the demapping unit 403 is deinterleaved by the deinterleaving unit 404.
- the baseband signal processing unit 104 includes a control information demodulation unit 405 that demodulates control information, a data demodulation unit 406 that demodulates downlink shared data, and a channel estimation unit 407.
- the control information demodulator 405 includes a common control channel control information demodulator 405a that demodulates the downlink common control channel control information from the downlink control channel, and the uplink shared data by blind decoding the search space according to the present invention from the downlink control channel.
- Control information demodulator 405b for uplink shared data channel that demodulates control information for channel, and control for downlink shared data channel that demodulates control information for downlink shared data channel by blind decoding the search space according to the present invention from the downlink control channel
- an information demodulator 405c The data demodulator 406 includes a downlink shared data demodulator 406a that demodulates user data and higher control signals, and a downlink shared channel data demodulator 1406b that demodulates downlink shared channel data.
- the common control channel control information demodulator 405a extracts common control channel control information that is common control information for users through blind decoding processing, demodulation processing, channel decoding processing, and the like of the common search space of the downlink control channel (PDCCH). .
- the common control channel control information includes downlink channel quality information (CQI), is input to the mapping unit 115 described later, and is mapped as part of transmission data to the radio base station apparatus 20.
- CQI downlink channel quality information
- the uplink shared data channel control information demodulator 405b is an uplink shared data channel that is user-specific uplink allocation information by blind decoding processing, demodulation processing, channel decoding processing, etc. of the user-specific search space of the downlink control channel (PDCCH). Control information is extracted.
- the user-specific search space controls which component carrier using the demodulated DCI using the CIF. Identify whether it is information.
- the uplink allocation information is used for controlling the uplink shared data channel (PUSCH), and is input to the downlink common channel data demodulating unit 406b.
- the downlink shared data channel control information demodulator 405c is used for the downlink shared data channel that is a downlink control signal unique to the user by blind decoding processing, demodulation processing, channel decoding processing, etc. of the user dedicated search space of the downlink control channel (PDCCH). retrieve control information.
- the user-specific search space controls which component carrier using the demodulated DCI using the CIF. Identify whether it is information.
- the downlink shared data channel control information is used to control the downlink shared data channel (PDSCH) and is input to the downlink shared data demodulation unit 406.
- the downlink shared data channel control information demodulator 405c performs a blind decoding process on the user-specific search space based on information on the PDCCH and PDSCH included in the higher control signal demodulated by the downlink shared data demodulator 406a. Do. Information related to the user-specific search space (which may include ON / OFF of activation / deactivation of PDSCH / PDCCH) is signaled by the upper control signal.
- the downlink shared data demodulator 406a acquires user data and higher control information based on the downlink shared data channel control information input from the downlink shared data channel control information demodulator 405c. Upper control information (including mode information) is output to channel estimation section 407.
- the downlink common channel data demodulator 406bc demodulates the downlink common channel data based on the uplink shared data channel control information input from the uplink shared data channel control information demodulator 405b.
- the channel estimation unit 407 performs channel estimation using the common reference signal.
- the estimated channel fluctuation is output to the common control channel control information demodulator 405a, the uplink shared data channel control information demodulator 405b, the downlink shared data channel control information demodulator 405c, and the downlink shared data demodulator 406a.
- These demodulation units demodulate the downlink allocation information using the estimated channel fluctuation and demodulation reference signal.
- the baseband signal processing unit 104 includes a data generation unit 411, a channel encoding unit 412, a modulation unit 413, a DFT unit 414, a mapping unit 415, an IFFT unit 416, and a CP insertion unit 417 as functional blocks of a transmission processing system.
- the data generation unit 411 generates transmission data from the bit data input from the application unit 105.
- the channel coding unit 412 performs channel coding processing such as error correction on the transmission data, and the modulation unit 413 modulates the channel-coded transmission data with QPSK or the like.
- the DFT unit 414 performs discrete Fourier transform on the modulated transmission data.
- Mapping section 415 maps each frequency component of the data symbol after DFT to a subcarrier position designated by the base station apparatus.
- the IFFT unit 416 performs inverse fast Fourier transform on input data corresponding to the system band to convert it into time series data, and the CP insertion unit 417 inserts a cyclic prefix into the time series data at data delimiters.
- DCI downlink control information
- Control information generating section 300 (UE # 1) for UE # 1 performs RRC signaling on component carriers CC0 to CC3 constituting the system band to mobile station apparatus 10 using a higher control signal.
- the control information generation unit 300 (UE # 1) performs RRC signaling on the SS aggregation component carrier CC0 that aggregates the search spaces of a plurality of component carriers to the mobile station apparatus 10 using a higher control signal.
- FIG. 5B Control information generating section 300 (UE # 1) for UE # 1 performs RRC signaling on component carriers CC0 to CC3 constituting the system band to mobile station apparatus 10 using a higher control signal.
- the control information generation unit 300 (UE # 1) performs RRC signaling on the SS aggregation component carrier CC0 that aggregates the search spaces of a plurality of component carriers to the mobile station apparatus 10 using a higher control signal.
- the component carrier number (CC1) that transmits PDCCH and PDSCH are transmitted.
- RRC signaling is performed using the component carrier number (CC2, CC3) and the higher control signal.
- control information generating section 300 (UE # 1) performs RRC signaling of the CC number of the component carrier that is deactivated.
- the upper control signal subjected to RRC signaling is transmitted by being arranged on the PDSCH.
- the downlink control information generation unit 306 (UE # 1) of the component carriers CC0 to CC3 generates control information D0 to D3, and the uplink control information generation unit 311 (UE # 1) controls the control information U0 to U3. Is generated. CIF is assigned to the control information D0 to D3 and U0 to U3, respectively.
- the generated control information is passed to the downlink control information generation unit 306 (UE # 1) and the uplink control information generation unit 311 (UE # 1) of the SS aggregation component carrier (CC0).
- the downlink control information generation section 306 (UE # 1) and the uplink control information generation section 311 (UE # 1) determine the size of the search space by applying one of the methods shown in FIGS. To do.
- the basic size (6CCE) is simply multiplied by N times the number N of component carriers.
- a search space size that partially overlaps between component carriers is configured by giving a CC-specific offset. With the method shown in FIG. 15, mapping is performed so that the overlap between component carriers is reduced.
- Control information (D0 or D0 ′) generated by the downlink control information generation unit 306 (UE # 1) and control information (U0 or U0 ′) generated by the uplink control information generation unit 311 (UE # 1) are control channels. Multiplexing is performed by the multiplexing unit 314 so as not to overlap, and the search space arrangement state shown in FIG. 5B is obtained. As described above, the PDCCH of the SS aggregation component carrier CC0 in which the control information D0 to D3 and U0 to U3 are arranged in the search space is transmitted.
- FIG. 12B shows a state where the component carrier CC2 is deactivated.
- the downlink control information generation section 306 performs control so that control information is not allocated in the search space of the component carrier CC2 in which the PDSCH is deactivated, and transmission power is not allocated.
- the control information generation unit 300 generates channel “OFF” information for the deactivated PDSCH and / or PDCCH, and performs RRC signaling to the mobile terminal apparatus 10.
- the mobile terminal apparatus 10 serving as the user UE # 1 receives the PDCCH on the downlink.
- Deinterleaving section 404 deinterleaves the PDCCH mapped to the first to third OFDM symbols of the subframe.
- the control information demodulator 405 since the rate matching parameter (the number of CCEs) and the start position of the CCE are unknown, the control information demodulator 405 performs blind decoding in units of CCE, and the CRC masked with the user ID is OK. Search for a CCE.
- the downlink shared data channel control information demodulator 405a performs blind decoding on the PDCCH search space SS1 to search for shared data channel control information addressed to itself. At this time, since SS aggregated component carrier CC0 is already notified, blind decoding of PDCCH is not performed for component carriers CC1 to CC3 to which PDCCH is not transmitted. Control information D0 to D3 is demodulated by blindly decoding search space SS1. Based on the CIF added to the control information D0 to D3, the control information of the component carriers CC1 to CC3 is specified.
- the uplink shared data channel control information demodulator 405b performs blind decoding on the PDCCH search space SS2 to search for the shared data channel control information addressed to itself. PDCCH blind decoding is not performed for component carriers CC1 to CC3 to which no PDCCH is transmitted. Control information U0 to U3 is demodulated by blind-decoding search space SS2. Based on the CIF added to the control information U0 to U3, the control information of the component carriers CC1 to CC3 is specified.
- the uplink shared data channel control information demodulator 405b interprets the searched control information U0 to U3 addressed to itself. Then, the resource allocation information and other parameters (MCS information, etc.) are extracted from DCI Format 0. The resource allocation information is given to the mapping unit 415, and other parameters are given to the corresponding blocks such as the channel coding unit 412 and the modulation unit 413.
- the component carrier CC0 is signaled as an anchor carrier.
- An anchor carrier is recognized between the mobile station device 10 and the base station measure 20.
- the downlink control information generation unit 306 (UE # 1) and the uplink control information generation unit 311 (UE # 1) are arranged in the search space without adding CIF to the control information D0 and U0 of the anchor carrier.
- the downlink shared data channel control information demodulator 405a and the uplink shared data channel control information demodulator 405b control the component carrier CC0 (anchor carrier) using the control information D0 and U0 to which no CIF is assigned. It can be recognized as information.
- an SS aggregation component carrier is determined for each group, and the figure is shown for each group.
- the search space control shown in 5B or FIG. 5C is performed.
- RRC signaling is performed for the SS aggregation component carrier that becomes the CC that sends the PDCCH for each group and the CC number of the CC that sends the PDSCH.
- three types of blind decoding may be defined, and a search space may be provided for each blind decoding type.
- control information (U0) composed of uplink allocation information is generated with DCI Format 0A having a size larger than that of the compact type DCI Format 0. If the large DCI format 0A is instructed from the scheduling unit 310, the uplink control information generation unit 311 generates control information (U0) configured with the uplink allocation information in the DCI format 0A. Control information (U0) generated by the large DCI Format 0A is arranged in the third search space SS3.
- the uplink shared data channel control information demodulation section 405b demodulates the control information (U0) generated by the DCI Format 0A by blind decoding the third search space SS3.
- the compact second search space SS2 may be supported only by the anchor carrier (CC0).
- the anchor carrier (CC0) has a search space configuration that allows fallback from the large DCI Format 0A to the compact DCI Format 0.
- the uplink control information generating unit 311 switches the generation of control information including uplink allocation information to the compact size DCI Format 0, and enters the second search space SS2.
- Compact size control information (U0 ') is arranged.
- the downlink control information generation unit 306 uses the search space shown in option 2 of FIG. 10 when generating the control information (D1 ′) with the compact size DCI Format 1A. That is, a compact search space SS2 in which only uplink control information (UL) is not allocated and control information (D1 ′) is allocated is arranged in the PDCCH of the asymmetric component carrier CC1.
- the downlink shared data channel control information demodulation section 405a demodulates the control information (D0 ′) generated by the DCI Format 1A by blind decoding the second search space SS2.
- control information (D0 ′) is not arranged in the search space SS2, and only the normal size DCI Format 1 is arranged and sent in the first search space SS1.
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Abstract
Description
図5は4つのコンポーネントキャリアCC0~CC3で構成されたシステム帯域が図示されており、2つのコンポーネントキャリアCC0、CC1が同一の帯域幅を有し、残りの2つのコンポーネントキャリアCC2、CC3が同一の帯域幅であってCC0、CC1とは相違する帯域幅を有する。上りリンクのコンポーネントキャリアと下りリンクのコンポーネントキャリアとはシンメトリックである。なお、図5Aに示すサーチスペース配置は、図3A、図4Aと同様の配置である。
他のコンポーネントキャリアからビットサイズの異なる上り割当て情報U0(CC0)を流用しないため、両者のビットサイズを合わせるためのパディングビット追加の作業が発生せず、処理の簡素化を図ることができる。
図11は、キャリアアグリゲーション数=1コンポーネントキャリアの場合のPDCCHへのサーチスペースの配置例を示している。
下りリンクの通信チャネルは、各移動端末装置10で共有されるPDSCHと、下りL1/L2制御チャネル(PDCCH、PCFICH、PHICH)とを有する。このPDSCHにより、ユーザデータ及び上位制御信号が伝送される。上位制御信号は、キャリアアグリゲーション数の追加/削減、各コンポーネントキャリアにおいて適用される上りリンクの無線アクセス方式(SC-FDMA/クラスタ化DFT拡散OFDM)を移動端末装置10に対して通知するRRCシグナリングを含む。また、PDSCH及び又はPDCCHを活性化/非活性化するモードをサポートする場合は、コンポーネントキャリア毎にPDSCH、PDCCHの活性化/非活性化をON/OFFするシグナリングを含む。
Claims (17)
- ユーザ端末との間の無線通信に用いられる下りリンク及び上りリンクのシステム帯域を基本周波数ブロック単位で選択する選択手段と、
前記選択された基本周波数ブロックで個別に送られるデータチャネルをそれぞれ復調するための下りリンク制御情報を生成し、前記システム帯域を構成する複数の基本周波数ブロックの中の特定の基本周波数ブロックの下り制御チャネルに、複数の基本周波数ブロックの下りリンク制御情報が集約されたサーチスペースを配置する下り制御情報生成手段と、
前記下り制御情報生成手段によって前記サーチスペース内に下りリンク制御情報が集約して配置された前記下り制御チャネルを送信する送信手段と、
を具備したことを特徴とする基地局装置。 - 前記下り制御情報生成手段は、基本周波数ブロックを表す識別子を前記各下りリンク制御情報に付与することを特徴とする請求項1記載の基地局装置。
- 前記下り制御情報生成手段は、ノーマルサイズの下りリンク制御情報と、前記ノーマルサイズに比べてビットサイズが小さいコンパクトサイズの下りリンク制御情報とを生成可能であり、前記ノーマルサイズの下りリンク制御情報が集約される第1サーチスペースと、前記コンパクトサイズの下りリンク制御情報が集約される第2サーチスペースとの少なくとも2種類のサーチスペースを、前記特定の基本周波数ブロックの下り制御チャネルに配置することを特徴とする請求項1記載の基地局装置。
- 前記選択手段は、選択する基本周波数ブロックに、下りリンクの基本周波数ブロックだけが割り当てられ、上りリンクの基本周波数ブロックが割り当てられない非対称の基本周波数ブロックを含み、
前記下り制御情報生成手段は、非対称の基本周波数ブロックの下り制御チャネルに、下りリンク割当て情報で構成されるノーマルサイズの下りリンク制御情報を配置する第1サーチスペースと、前記ノーマルサイズに比べてビットサイズが小さいコンパクトサイズの下りリンク制御情報を配置する第2サーチスペースとを配置し、前記第2サーチスペースにはコンパクトサイズの下りリンク割当て情報で構成される下りリンク制御情報だけを割り当てる、ことを特徴とする請求項3記載の基地局装置。 - 前記選択手段は、選択する基本周波数ブロックに、下りリンクの基本周波数ブロックだけが割り当てられるが上りリンクの基本周波数ブロックが割り当てられない非対称の基本周波数ブロックを含み、
前記下り制御情報生成手段は、非対称の基本周波数ブロックの下り制御チャネルに、下りリンク割当て情報で構成されるノーマルサイズの下りリンク制御情報を配置する第1サーチスペースを配置し、前記ノーマルサイズに比べてビットサイズが小さいコンパクトサイズの下りリンク制御情報を配置する第2サーチスペースは配置しない、ことを特徴とする請求項3記載の基地局装置。 - 前記選択手段は、選択する基本周波数ブロックに、下りリンクの基本周波数ブロックだけが割り当てられるが上りリンクの基本周波数ブロックが割り当てられない非対称の基本周波数ブロックを含み、
前記下り制御情報生成手段は、非対称の基本周波数ブロックの下り制御チャネルに、下りリンク割当て情報で構成されるノーマルサイズの下りリンク制御情報を配置する第1サーチスペースと、前記ノーマルサイズに比べてビットサイズが小さいコンパクトサイズの下りリンク制御情報を配置する第2サーチスペースとを配置し、前記第2サーチスペースでは前記非対称の基本周波数ブロックにおける下りリンクの基本周波数ブロックと他の対称の基本周波数ブロックにおける上りリンクの基本周波数ブロックとのペアで配置可能である、ことを特徴とする請求項3記載の基地局装置。 - 前記下り制御情報生成手段は、非対称側の下りリンクの基本周波数ブロックの下り制御情報にパディングビットを付加して当該下りリンクの基本周波数ブロックとペアを構成する対称側の上りリンクの基本周波数ブロックの上りリンク割当て情報で構成される下りリンク制御情報にビットサイズを合わせる、ことを特徴とする請求項6記載の基地局装置。
- 前記下り制御情報生成手段は、前記特定の基本周波数ブロック用のサーチスペースの開始位置を基準にして、基本周波数ブロック数に応じた回数だけ同一サイズのサーチスペースを連続して配置する、ことを特徴とする請求項1記載の基地局装置。
- 前記下り制御情報生成手段は、システム帯域を構成する基本周波数ブロック数が所定数Nより小さければ基本周波数ブロック数に比例してサーチスペースの全体サイズを動的に拡大し、基本周波数ブロック数が所定数Nより大きければサーチスペースの全体サイズを最大値に固定することを特徴とする請求項1記載の基地局装置。
- 前記下り制御情報生成手段は、前記特定の基本周波数ブロック用のサーチスペースの開始位置を基準にして、基本周波数ブロック固有のオフセットを与えてサーチスペースサイズを変化させることを特徴とする請求項1記載の基地局装置。
- 前記下り制御情報生成手段は、下りリンク制御情報に割り当てるビット数の基本単位であるCCE(Control Channel Element)のアグリゲーション数をNcc、CCEアグリゲーション数を表すCCEアグリゲーションレベルをNlevel、サーチスペースのサイズをNsize、サーチスペースのオフセット量をNoffset、各Nlevel={1,2,4,8}における各Nsize={6,12,8,16}、基本周波数ブロック数をNccとして、
NccがNsize×Nccよりも大きい場合は、Noffset=Nsize/Nlevelとし、
NccがNsize×Nccより小さい場合は、下式に基づいてNoffsetを計算し、
前記特定の基本周波数ブロック用のサーチスペースの開始位置を基準にして、前記計算したオフセット量Noffsetを与えて基本周波数ブロック間でのサーチスペースの重なりを抑制することを特徴とする請求項1記載の基地局装置。 - システム帯域を構成する一部の基本周波数ブロックのデータチャネルが非活性化された場合、データチャネルが非活性化された基本周波数ブロックの下り制御チャネルを非活性化することを特徴とする請求項1記載の基地局装置。
- 前記下り制御情報生成手段は、基本周波数ブロックを表す識別子を前記各下りリンク制御情報に付与し、システム帯域を構成する一部の基本周波数ブロックのデータチャネルが非活性化された場合、非活性化されたデータチャネル復調用の下りリンク制御情報のサーチスペース領域を非活性化させることを特徴とする請求項12記載の基地局装置。
- 前記特定の基本周波数ブロック以外の他の基本周波数ブロックの下り制御チャネルを個別に活性化又は非活性化可能にしたことを特徴とする請求項12記載の基地局装置。
- 前記下り制御情報生成手段は、システム帯域を構成する基本周波数ブロック毎に、下りリンク割当て情報で構成されるノーマルサイズの下りリンク制御情報と、前記ノーマルサイズに比べてビットサイズが小さいコンパクトサイズの下りリンク制御情報と、上りリンク割当て情報で構成され前記コンパクトサイズよりも大きいサイズの下りリンク制御情報とを生成可能であり、前記ノーマルサイズの下りリンク制御情報が配置される第1サーチスペースと、前記コンパクトサイズの下りリンク制御情報が配置される第2サーチスペースと、前記コンパクトサイズよりも大きいサイズの上りリンク割当て情報用の下りリンク制御情報が配置される第3サーチスペースと、の3種類のサーチスペースを、各基本周波数ブロックの下り制御チャネルに配置することを特徴とする請求項1記載の基地局装置。
- システム帯域を構成する1又は複数の基本周波数ブロックを受信し、前記基本周波数ブロックの中の特定の基本周波数ブロックの下り制御チャネルに複数の基本周波数ブロックの下りリンク制御情報が集約されたサーチスペースが含まれている、受信手段と、
前記特定の基本周波数ブロックの下り制御チャネルのサーチスペースをブラインドデコーディングして複数の基本周波数ブロックの下りリンク制御情報を復調する制御情報復調部と、
前記制御情報復調部で復調された前記各基本周波数ブロックの下りリンク制御情報を用いて対応する前記各基本周波数ブロックのデータチャネルを復調するデータ復調部と、
を具備したことを特徴とするユーザ端末。 - ユーザ端末との間の無線通信に用いられる下りリンク及び上りリンクのシステム帯域を基本周波数ブロック単位で選択するステップと、
前記選択された基本周波数ブロックで個別に送られるデータチャネルをそれぞれ復調するための下りリンク制御情報を生成し、前記システム帯域を構成する複数の基本周波数ブロックの中の特定の基本周波数ブロックの下り制御チャネルに、複数の基本周波数ブロックの下りリンク制御情報が集約されたサーチスペースを配置するステップと、
前記サーチスペース内に下りリンク制御情報が集約して配置された前記下り制御チャネルを送信するステップと、
を具備したことを特徴とする通信制御方法。
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- 2011-03-30 EP EP11765601.7A patent/EP2557871A4/en not_active Withdrawn
- 2011-03-30 CA CA2795321A patent/CA2795321C/en active Active
- 2011-03-30 RU RU2012145231/07A patent/RU2533199C2/ru active
- 2011-03-30 CN CN201180027786.0A patent/CN102934503B/zh active Active
- 2011-03-30 US US13/639,285 patent/US8982752B2/en active Active
- 2011-03-30 AU AU2011237214A patent/AU2011237214B2/en active Active
- 2011-03-30 KR KR1020127026866A patent/KR101466619B1/ko active Active
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2012
- 2012-10-04 CL CL2012002776A patent/CL2012002776A1/es unknown
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Also Published As
| Publication number | Publication date |
|---|---|
| KR101466619B1 (ko) | 2014-12-01 |
| KR20120140673A (ko) | 2012-12-31 |
| CN102934503B (zh) | 2016-04-06 |
| RU2533199C2 (ru) | 2014-11-20 |
| AU2011237214A1 (en) | 2012-11-01 |
| CL2012002776A1 (es) | 2013-03-01 |
| JP2011223112A (ja) | 2011-11-04 |
| RU2012145231A (ru) | 2014-05-20 |
| EP2557871A1 (en) | 2013-02-13 |
| JP5455228B2 (ja) | 2014-03-26 |
| CA2795321C (en) | 2015-10-13 |
| US20130058294A1 (en) | 2013-03-07 |
| CN102934503A (zh) | 2013-02-13 |
| EP2557871A4 (en) | 2017-06-14 |
| US8982752B2 (en) | 2015-03-17 |
| AU2011237214B2 (en) | 2014-06-12 |
| CA2795321A1 (en) | 2011-10-13 |
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