WO2014069381A1 - 無線基地局、ユーザ端末、無線通信システム及び無線通信方法 - Google Patents
無線基地局、ユーザ端末、無線通信システム及び無線通信方法 Download PDFInfo
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- WO2014069381A1 WO2014069381A1 PCT/JP2013/079065 JP2013079065W WO2014069381A1 WO 2014069381 A1 WO2014069381 A1 WO 2014069381A1 JP 2013079065 W JP2013079065 W JP 2013079065W WO 2014069381 A1 WO2014069381 A1 WO 2014069381A1
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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 signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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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—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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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
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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 radio base station, a user terminal, a radio communication system, and a radio communication method in a next generation radio communication system.
- LTE Long Term Evolution
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- LTE-A LTE Advanced or LTE enhancement
- MIMO Multi Input Multi Output
- a plurality of transmission / reception antennas are prepared in a transceiver, and different transmission information sequences are transmitted simultaneously from different transmission antennas.
- MU-MIMO multi-user MIMO
- Hetnet Heterogeneous network
- CoMP Coordinatd Multi-Point
- the present invention has been made in view of this point, and an object thereof is to provide a radio base station, a user terminal, a radio communication system, and a radio communication method suitable for notification of radio resources constituting an extended downlink control channel.
- a radio base station is a radio base station that transmits downlink control information for a user terminal using an extended downlink control channel that is frequency-division multiplexed to a downlink shared data channel, the user terminal
- a setting unit configured to set a resource set including a plurality of resource blocks allocated to the enhanced downlink control channel, and for the user terminal, the plurality of resource blocks constituting the resource set
- a notification unit that notifies the pattern information and information indicating the number (n) of resource blocks constituting the resource set.
- a user terminal is a user terminal that receives downlink control information from a radio base station using an enhanced downlink control channel that is frequency-division multiplexed to a downlink shared data channel, and the enhanced downlink control
- a resource set including a plurality of resource blocks allocated to a channel is set in the user terminal, pattern information of the plurality of resource blocks configuring the resource set from the radio base station, and the resource
- the resource A receiving unit that receives information indicating the number of resource blocks (n) constituting the set, and a specifying unit that identifies the plurality of resource blocks based on the pattern information and the number of resource blocks (n). It is characterized by comprising.
- a radio base station a user terminal, a radio communication system, and a radio communication method suitable for notification of radio resources constituting an extended downlink control channel.
- 1 is a schematic diagram of a radio communication system to which MU-MIMO is applied. It is a figure which shows an example of the sub-frame by which downlink MU-MIMO transmission is performed. It is explanatory drawing of the sub-frame structure of extended PDCCH. It is explanatory drawing of the mapping method of extended PDCCH. It is a figure which shows an example of the dispersion
- FIG. 1 is a diagram illustrating an example of a wireless communication system to which MU-MIMO transmission is applied.
- the system shown in FIG. 1 has a hierarchical configuration in which small base stations (for example, RRH: Remote Radio Head, etc.) having a local coverage area are provided within the coverage area of a radio base station (for example, eNB: eNodeB).
- a radio base station for example, eNB: eNodeB
- UE User Equipment
- # 2 data for a plurality of user terminals UE # 1 and # 2 are simultaneously transmitted from a plurality of antennas of a radio base station.
- data for a plurality of user terminals UE # 3 and # 4 are simultaneously transmitted from a plurality of antennas of a plurality of small base stations.
- FIG. 2 is a diagram illustrating an example of a radio frame (for example, one subframe) to which downlink MU-MIMO transmission is applied.
- radio resources for a downlink control channel (PDCCH: Physical Downlink Control Channel) from the beginning to a predetermined OFDM symbol (maximum 3 OFDM symbols) in each subframe. It is secured as a region (PDCCH region).
- PDSCH area for a downlink shared data channel (PDSCH: Physical Downlink Shared Channel) is secured in radio resources after a predetermined symbol from the top of the subframe.
- DCI Downlink Control Information
- UE # 1 to # 4 Downlink Control Information
- DCI includes data allocation information for the user terminal UE in the PDSCH region.
- the user terminal UE # 2 receives data for the user terminal UE # 2 assigned to the PDSCH region based on the DCI for the user terminal UE # 2 assigned to the PDCCH region.
- DCI allocation areas cannot be secured for all user terminals UE # 1 to # 6 in the PDCCH area.
- DCI for user terminals UE # 5 and # 6 cannot be assigned.
- the effect of improving the use efficiency of radio resources by MU-MIMO transmission may not be sufficiently obtained .
- the PDCCH allocation region is expanded from the beginning of the subframe to a control region other than a maximum of 3 OFDM symbols (the PDCCH region is expanded to an existing PDSCH region after 4 OFDM symbols).
- the PDCCH region is expanded to an existing PDSCH region after 4 OFDM symbols.
- TDM approach a method of time-division multiplexing PDSCH and PDCCH
- FDM approach a method of frequency-division multiplexing PDSCH and PDCCH as shown in FIGS. 3B and 3C.
- PDCCHs are arranged over the entire system bandwidth in some OFDM symbols after 4 OFDM symbols in a subframe.
- PDCCH is arranged in a part of the system bandwidth in all OFDM symbols after 4 OFDM symbols in a subframe.
- the PDCCH is arranged in a part of the system bandwidth in all OFDM symbols of the subframe. Note that the resource arrangement illustrated in FIG. 3C may be referred to as a New carrier type or the like.
- the PDCCH frequency-division multiplexed with the PDSCH by the FDM approach is demodulated using a demodulation reference signal (DM-RS: DeModulation-Reference Signal) which is a user-specific reference signal.
- DM-RS DeModulation-Reference Signal
- DCI transmitted on the PDCCH can obtain a beamforming gain, similarly to downlink data transmitted on the PDSCH, and is effective for increasing the capacity of the PDCCH.
- the PDCCH frequency-division multiplexed with the PDSCH in the FDM approach is referred to as an extended PDCCH (enhanced PDCCH).
- This enhanced PDCCH may be called an enhanced downlink control channel, ePDCCH, E-PDCCH, FDM type PDCCH, UE-PDCCH, or the like.
- FIG. 4 is a diagram for explaining a DCI mapping method in the extended PDCCH.
- FIG. 4A shows local mapping and
- FIG. 4B shows distributed mapping.
- the extended PDCCH is composed of a predetermined number of physical resource block (PRB) pairs distributed in the system bandwidth.
- the PRB pair is composed of two PRBs continuous in the time direction, and is identified by a PRB index given in the frequency direction.
- a plurality of PRB pairs constituting the extended PDCCH may be dynamically determined by an upper layer or the like, or may be fixedly determined by specifications.
- 1DCI is locally mapped to a specific PRB pair constituting the extended PDCCH.
- 1 DCI is mapped into a predetermined number of PRB pairs (for example, 1 or 2 PRB pairs with good channel quality) based on the CQI fed back from the user terminal UE.
- frequency scheduling gain can be obtained by using CQI.
- PDSCH may be mapped to a PRB pair to which DCI is not mapped among a plurality of PRB pairs constituting the extended PDCCH.
- 1DCI is distributed and mapped to a plurality of PRB pairs constituting the extended PDCCH. Specifically, 1DCI is divided into a plurality of divided units, and each divided unit is distributed and mapped to the plurality of PRB pairs (may be all PRB pairs).
- frequency diversity gain can be obtained by dispersing 1DCI over the system bandwidth.
- each DCI is divided into a plurality of divided units, and each divided unit is distributed and mapped to a plurality of PRB pairs constituting the extended PDCCH.
- the extended PDCCH is composed of many PRB pairs (eight PRB pairs in FIG. 5A)
- the utilization efficiency of radio resources decreases. This is because 1DCI division units are distributed and mapped to many PRB pairs, and the number of PRB pairs to which PDSCH can be mapped decreases.
- the distributed mapping as shown in FIG. 5B, it is considered to limit the number of PRB pairs to which 1DCI divided units are mapped in a distributed manner.
- the number of PRB pairs to which 1DCI division units are distributed and mapped is limited to “4”. For this reason, in FIG. 5B, the number of PRB pairs to which the PDSCH can be mapped increases as compared to the case illustrated in FIG. 5A.
- enhanced PDCCH sets # 1 and # 2 are each configured to include a plurality of PRB pairs assigned to the enhanced PDCCH.
- the extended PDCCH set may be called an enhanced PDCCH set, an ePDCCH set, an E-PDCCH set, or simply a set.
- the number of extended PDCCH sets (K) set for each user terminal UE is, for example, 1 ⁇ K ⁇ 2, but is not limited thereto.
- the number of PRB pairs (n) constituting each extended PDCCH set is, for example, 2, 4, 8, or 16, but is not limited thereto.
- the extended PDCCH sets # 1 and # 2 may be set to be overlapped with a plurality of user terminals UE (for example, user terminals UE # 1 to # 10).
- a predetermined number for example, 5
- DCI can be mapped only to one extended PDCCH set # 1, and the other extended PDCCH set # 2 Can be used for PDSCH.
- wireless resource can be improved by setting several extended PDCCH sets between user terminals UE overlappingly.
- DCI may be distributed mapped (see FIG. 4B and FIG. 5) or locally mapped (see FIG. 4A).
- a primary set and a secondary set may be set with respect to each user terminal UE.
- the primary set is an extended PDCCH set that is commonly set for all user terminals UE, and is used as, for example, a common search space (CSS).
- the secondary set is an extended PDCCH set individually set for at least one user terminal UE, and is used as an individual search space (UE-specific SS), for example.
- FIG. 7 is a diagram illustrating an example of a notification method using a bitmap.
- a bitmap indicating a PRB pair constituting an extended PDCCH set (set) is notified to the user terminal UE by higher layer signaling such as RRC signaling.
- the bitmap for each extended PDCCH set is composed of a number of bits equal to the number of PRB pairs constituting the system bandwidth. Each bit corresponds to a PRB pair, and the setting value (“0” or “1”) of each bit indicates whether or not the corresponding PRB pair constitutes an extended PDCCH set.
- bitmaps indicating PRB pairs constituting the extended PDCCH sets # 1 and # 2 are notified to the user terminal UE # 1 in which the extended PDCCH sets # 1 and # 2 are set.
- bitmaps indicating PRB pairs constituting the extended PDCCH sets # 1 and # 3 are respectively notified to the user terminal UE # 2 in which the extended PDCCH sets # 1 and # 3 are set.
- the notification method using the bitmap it is necessary to notify the same number of bits as the number of PRB pairs constituting the system bandwidth for each extended PDCCH set. For example, when the number of PRB pairs constituting the system bandwidth is “100”, it is necessary to notify 100 bits for each extended PDCCH set.
- FIG. 8 is a diagram illustrating an example of a notification method using a PRB index.
- the PRB index of the PRB pair constituting the extended PDCCH set (set) is notified to the user terminal UE by higher layer signaling such as RRC signaling.
- the 100 PRB pairs are uniquely identified by a 7-bit PRB index.
- the extended PDCCH set # 1 is composed of PRB pairs # 1, # 10, # 50, and # 96
- the notification method using the PRB index it is necessary to notify the number of bits equal to the product of the number of bits of the PRB index and the number of PRB pairs n per extended PDCCH set for each extended PDCCH set. For example, when the system bandwidth is composed of 100 PRB pairs, 28 bits of the product of the number of bits of the PRB index “7” and the number of PRB pairs n “4” per extended PDCCH set are used as the extended PDCCH set. It is necessary to notify every time.
- information for example, the bitmap in FIG. 7 and the PRB index in FIG. 8 indicating each of a plurality of PRB pairs constituting the extended PDCCH set is notified to the user terminal UE. For this reason, there is a possibility that the overhead increases with the notification of the configuration of the extended PDCCH set.
- the present inventors indicate a combination of the plurality of PRB pairs instead of information (for example, the bitmap in FIG. 7 or the PRB index in FIG. 8) indicating the plurality of PRB pairs themselves constituting the extended PDCCH set.
- the radio base station configures an extended PDCCH set (resource set) for the user terminal UE.
- the radio base station notifies the user terminal UE of pattern information of a plurality of resource blocks constituting the extended PDCCH set and information indicating the number (n) of resource blocks constituting the extended PDCCH set.
- the user terminal UE specifies a plurality of resource blocks constituting the extended PDCCH set based on the pattern information and the number of resource blocks (n).
- the pattern information is information indicating a combination of a plurality of resource blocks constituting the extended PDCCH set.
- the pattern information may be a pattern index indicating a resource block pattern that is a combination of the plurality of resource blocks (first and second modes described later).
- the pattern information includes a pattern index indicating an RBG pattern that is a combination of a plurality of resource block groups (RBGs) each including the plurality of resource blocks, and position information of the plurality of resource blocks in each of the plurality of RBGs. (Third and fourth modes described later).
- the resource block is a frequency resource unit constituting the extended PDCCH set, and is, for example, a PRB pair or a PRB.
- a PRB pair is used as a resource block
- a resource block group (RBG) is configured by a predetermined number of resource blocks that are continuous in the frequency direction.
- a resource block group is configured by a predetermined number of PRB pairs continuous in the frequency direction, but may be configured by a predetermined number of PRBs continuous in the frequency direction.
- the radio base station includes a PRB pattern index (pattern index) indicating a PRB pattern (resource block pattern), and information indicating the number of PRB pairs (n) constituting the extended PDCCH set, To the user terminal UE.
- the PRB pattern is a combination of n PRB pairs constituting the extended PDCCH set.
- FIG. 9 is an explanatory diagram of the wireless communication method according to the first aspect.
- the total number N of PRB pairs constituting the system bandwidth is “25”, and a PRB index (eg, 1-25) is assigned to each of the 25 PRB pairs.
- the total number of PRB pairs constituting the system bandwidth is not limited to “25”.
- the PRB index shown in FIG. 9 is merely an example, and for example, a PRB index of 0-24 may be assigned to 25 PRB pairs.
- the number n of PRB pairs constituting the extended PDCCH set (set) is, for example, four types of “2”, “4”, “8”, and “16”.
- the number of four types of PRB pairs n is indicated by 2-bit information (for example, “00”, “01”, “10”, “11”).
- the number n of PRB pairs constituting the extended PDCCH set is not limited to “2”, “4”, “8”, and “16”.
- the information indicating the number of PRB pairs n is not limited to 2 bits, and may be increased or decreased according to the number of types of the PRB pair number n.
- a PRB pattern index (for example, 1-12650) for identifying each PRB pattern is assigned to 12650 types of PRB patterns. The 12650 types of PRB patterns are uniquely identified by a 14-bit PRB pattern index.
- the PRB pattern of the extended PDCCH set is identified by the PRB pattern index “2716”.
- the radio base station sends a PRB pattern index “00101010011100 (decimal number“ 2716 ”)” and information “01” indicating the number of PRB pairs n “4” constituting the extended PDCCH set to the user terminal UE. Notice.
- the notification is performed using higher layer signaling such as RRC signaling, for example.
- FIG. 10 is a diagram illustrating an example of a PRB pattern and a PRB pattern index.
- the case where the total number N of PRB pairs constituting the system bandwidth is “25” and the number n of PRB pairs constituting the extended PDCCH set is “4” will be described as an example.
- the PRB index A2 of the second PRB pair is in ascending order
- the PRB index A3 of the third PRB pair is ascending order, and so on Similarly, all kinds of PRB patterns are arranged.
- the radio base station calculates a PRB pattern index according to Equation (1).
- N is the total number of PRB pairs constituting the system bandwidth.
- n is the number of PRB pairs that make up the enhanced PDCCH set.
- Ai (1 ⁇ i ⁇ n) is a PRB index of the i-th PRB pair in the PRB pattern.
- the PRB pattern index calculation method in the radio base station will be described with reference to FIG.
- the total number N of PRB pairs constituting the system bandwidth is “25”
- the number n of PRB pairs per extended PDCCH set is “4”
- the PRB pattern for the extended PDCCH set is PRB pair # 2.
- # 6, # 10, and # 20 as an example, a method for calculating the PRB pattern index using Expression (1) will be described.
- the extended PDCCH set includes PRB pairs # 2, # 6, # 10, and # 20
- the PRB indexes A1, A2, A3, and A4 of the first to fourth PRB pairs are “2” and “6”, respectively. ”,“ 10 ”, and“ 20 ”.
- the total number of PRB patterns is calculated. As shown in FIG. 11B, the total number of the PRB patterns is “631”.
- the total number of is calculated. As shown in FIG. 11B, the total number of the PRB patterns is “51”.
- the total number of PRB patterns is calculated. As shown in FIG. 11B, the total number of the PRB patterns is “9”.
- the PRB pattern until the combination of n PRB pairs constituting the extended PDCCH set (here, the combination of PRB pairs # 2, # 6, # 10, and # 20) is obtained.
- the total number of (2024 + 631 + 51 + 9) is calculated.
- the radio base station notifies the user terminal UE of the PRB pattern index calculated using the equation (1) and information indicating the number of PRB pairs n constituting the extended PDCCH set.
- the user terminal UE specifies a plurality of PRB pairs constituting the extended PDCCH set based on the PRB pattern index notified from the radio base station and the number of PRB pairs n.
- the user terminal UE finds the PRB index A1 that satisfies the equation (2-1), and specifies the first PRB pair constituting the extended PDCCH set. Similarly, the user terminal UE finds the PRB indexes A2, A3,... That satisfy the expressions (2-2), (2-3),..., Respectively, and configures the second, third,. Identify the pair.
- the index is a PRB pattern index notified from the radio base station to the user terminal UE.
- N is the total number of PRB pairs constituting the system bandwidth.
- n is the number of PRB pairs that make up the enhanced PDCCH set.
- Ai (1 ⁇ i ⁇ n) is a PRB index of the i-th PRB pair in the PRB pattern.
- i, j, and x are predetermined subscripts, respectively.
- the radio base station notifies the user terminal UE of the PRB pattern index (index) “2716” and the number of PRB pairs n “4” constituting the extended PDCCH set. Further, the total number N of PRB pairs constituting the system bandwidth is assumed to be “25”. In addition, the total number N of PRB pairs constituting the system bandwidth may be notified from the radio base station to the user terminal UE, or may be determined in advance according to specifications.
- the user terminal UE transmits the PRB pattern index “2716” notified from the radio base station, the number of PRB pairs n “4” per extended PDCCH set, and the total number of PRB pairs constituting the system bandwidth.
- N “25” is substituted into Expression (2-1), and the PRB index A1 that satisfies Expression (2-1) is specified.
- the formula (2-1) is satisfied when the PRB index A1 is “2”, the first PRB pair # 2 constituting the extended PDCCH set is specified.
- the user terminal UE specifies PRB indexes A2, A3, and A4 that satisfy the expressions (2-2), (2-3), and (2-4), respectively.
- equations (2-2), (2-3), and (2-4) are satisfied when the PRB indexes A2, A3, and A4 are “6”, “10”, and “20”, respectively.
- the second, third, and fourth PRB pairs # 6, # 10, and # 20 constituting the extended PDCCH set are specified.
- the user terminal UE based on the PRB pattern index “2716” notified from the radio base station and the number of PRB pairs n “4” constituting the extended PDCCH set, the equations (2-1) and ( The PRB pattern is reproduced by finding PRB indexes A1, A2, A3, and A4 that satisfy (2-2), (2-3), and (2-4), respectively. As a result, PRB pairs # 2, # 6, # 10, and # 20 constituting the extended PDCCH set are specified.
- the radio base station simply notifies the PRB pattern index and information indicating the number of PRB pairs constituting the extended PDCCH set n, and the user terminal UE transmits the extended PDCCH set.
- the PRB pair to be configured can be specified. For this reason, compared with the case of notifying the information (for example, the bitmap of FIG. 7 or the PRB index of FIG. 8) indicating the plurality of PRB pairs themselves constituting the extended PDCCH set, the notification of the resource configuration of the extended PDCCH set is performed. The overhead involved can be reduced.
- the overhead reduction effect by the wireless communication method according to the first aspect will be described.
- the overhead increases in proportion to the total number N of PRB pairs constituting the system bandwidth.
- the overhead increases as the number of bits of the PRB index increases.
- the wireless communication method according to the first aspect the overhead can be reduced as a whole as compared with a notification method using a bitmap or PRB index.
- the wireless communication method according to the first aspect requires the arithmetic processing described with reference to FIGS. 10 to 12, and thus has higher complexity than the notification method using a bitmap or PRB pair. Become. As described above, in the wireless communication method according to the first aspect, overhead associated with notification of the resource configuration of the extended PDCCH set is reduced by allowing the complexity of the arithmetic processing to some extent.
- the radio communication method according to the second aspect of the present invention will be described with reference to FIG.
- the radio communication method according to the second aspect is common to the first aspect in that the user terminal UE is notified of the PRB pattern index and information indicating the number of PRB pairs (n) constituting the extended PDCCH set.
- the wireless communication method according to the second aspect differs from the first aspect in that the PRB pattern is limited to a combination of n PRB pairs with equal intervals between PRB pairs. Below, it demonstrates centering around difference with a 1st aspect.
- FIG. 14 is an explanatory diagram of the wireless communication method according to the second aspect.
- the total number N of PRB pairs constituting the system bandwidth is “25” and the number n of PRB pairs constituting the extended PDCCH set is “4”
- duplication is started from 25 PRB pairs.
- N is the total number of PRB pairs that constitute the system bandwidth
- n is the number of PRB pairs that constitute the extended PDCCH set.
- the six types of PRB patterns are uniquely identified by the PRB index A1 of the first PRB pair. Therefore, the PRB index A1 can be used as a PRB pattern index.
- the PRB pattern of the extended PDCCH set is equal to the PRB index of the first PRB pair. It is identified with “3”.
- the radio base station has a 3-bit PRB pattern index “011 (decimal number“ 3 ”)” and 2-bit information “01” indicating the number of PRB pairs n “4” constituting the extended PDCCH set.
- the notification is performed using higher layer signaling such as RRC signaling, for example.
- the user terminal UE is based on the PRB pattern index notified from the radio base station, the total number N of PRB pairs constituting the system band, and the number n of PRB pairs constituting the extended PDCCH set.
- the plurality of PRB pairs constituting the extended PDCCH set are specified.
- the user terminal UE receives the PRB pattern index “3” notified from the radio base station, the total number N “25” of PRB pairs constituting the system band, and the number n of PRB pairs constituting the extended PDCCH set “n”. Based on the interval “6” calculated by “4”, the PRB indexes A1, A2, A3, and A4 are specified. Thereby, PRB pairs # 3, # 9, # 15, and # 21 constituting the extended PDCCH set are specified.
- the number of types of PRB patterns is reduced, the number of bits of the PRB pattern index can be reduced.
- overhead associated with notification of the resource configuration of the extended PDCCH set can be reduced.
- the first PRB index A1 that constitutes the PRB pattern is used as the PRB pattern index. For this reason, the radio base station does not need to perform the calculation process of the PRB pattern index described in the first aspect. As described above, in the radio communication method according to the second aspect, it is possible to reduce the overhead associated with the notification of the resource configuration of the extended PDCCH set while reducing the complexity of the arithmetic processing in the radio base station.
- the radio base station uses the RBG pattern index (pattern index) indicating the RBG pattern and the position information of the resource block in the resource block group (RBG) instead of the PRB pattern index as the user. It is different from the first aspect in that the terminal UE is notified.
- the RBG pattern is a combination of a plurality of RBGs each including n PRB pairs constituting the extended PDCCH set. Below, it demonstrates centering around difference with a 1st aspect.
- FIG. 15 is an explanatory diagram of the wireless communication method according to the third aspect.
- 1 RBG is configured by 2 PRB pairs continuous in the frequency direction.
- the number of PRB pairs constituting one RBG is not limited to “2”.
- the total number N of RBGs constituting the system bandwidth is “13”, and the 13 RBGs have RBG indexes (eg, 1-13). Is granted.
- An RBG pattern index (for example, 1-715) for identifying each RBG pattern is assigned to the 715 types of RBG patterns.
- the 715 types of RBG patterns are uniquely identified by a 10-bit RBG pattern index.
- the number of bits of the RBG pattern index (for example, 10 bits) is smaller than the number of bits of the PRB pattern index (for example, 14 bits).
- the position of the resource block in the RBG (for example, first and second) is identified by 1-bit position information. For this reason, in FIG. 15, even if 1-bit position information is added to the 10-bit RBG pattern index, the number of bits can be reduced from the 14-bit PRB pattern index. In addition, when 1 RBG is composed of 3 PRB pairs or more, position information of 2 bits or more may be used.
- the wireless base station may calculate the RBG pattern index using the above equation (1).
- N in the above formula (1) is the total number of RBGs constituting the system bandwidth.
- n is the number of PRB pairs that make up the enhanced PDCCH set.
- Ai (1 ⁇ i ⁇ n) is an RBG index of the i-th RBG in the RBG pattern.
- the user terminal UE performs RBG based on the RBG pattern index, the total number N of RBGs constituting the system bandwidth, and the number n of PRB pairs constituting the extended PDCCH set.
- the i-th RBG index Ai (1 ⁇ i ⁇ n) in the pattern is specified, and based on the RBG index Ai (1 ⁇ i ⁇ n) and the position information, a plurality of PRB pairs constituting the extended PDCCH set are determined. Identify.
- the user terminal UE specifies RBG indexes A1, A2, A3,... That satisfy the expressions (2-1), (2-2), (2-3).
- the user terminal UE configures an extended PDCCH set based on the identified RBG indexes A1, A2, A3,... And the PRB pair position information in each RBG. Identify the pair.
- the user terminal UE is notified of the RBG pattern index having a smaller number of bits than the PRB pattern index and the position information of the PRB pair in the RBG.
- the overhead accompanying the notification of the resource structure of an extended PDCCH set can be reduced.
- the radio communication method according to the fourth aspect of the present invention will be described with reference to FIG.
- the wireless communication method according to the fourth aspect is common to the third aspect in that the user terminal UE is notified of the RBG pattern index and the position information of the PRB pair in the RBG.
- the wireless communication method according to the fourth aspect differs from the third aspect in that the RBG pattern is limited to a combination of n RBGs having the same interval between RBGs. Below, it demonstrates centering on difference with a 3rd aspect.
- FIG. 16 is an explanatory diagram of the wireless communication method according to the fourth aspect.
- the total number N of RBGs constituting the system bandwidth is “13” and the number n of PRB pairs constituting the extended PDCCH set is “4”, there is no duplication from 13 RBGs.
- N is the total number of RBGs that make up the system bandwidth
- n is the number of PRB pairs that make up the enhanced PDCCH set.
- the three types of RBG patterns are uniquely identified by the RBG index A1 of the first RBG. Therefore, the RBG index A1 can be used as the RBG pattern index.
- the radio base station performs the 2-bit RBG pattern index “01 (decimal number“ 1 ”)” and the 2-bit information “0” indicating the number of PRB pairs n “4” constituting the extended PDCCH set. 01 "and 1-bit position information" 0 "indicating that the position of the PRB in each RBG is the first are notified to the user terminal UE.
- the notification is performed using higher layer signaling such as RRC signaling, for example.
- the user terminal UE includes the RBG pattern index notified from the radio base station, the total number N of RBG pairs constituting the system band, and the number n of PRB pairs constituting the extended PDCCH set. Based on the RBG index Ai (1 ⁇ i ⁇ n) and the RBG index Ai (1 ⁇ i ⁇ n) and the position information, a plurality of PRB pairs constituting the extended PDCCH set are specified.
- the user terminal UE calculates an interval (offset) “3” between RBGs based on the result of dividing the total number N “13” of RBGs by the number of PRB pairs n “4”.
- the number of types of RBG patterns decreases, the number of bits of the RBG pattern index can be reduced.
- overhead associated with notification of the resource configuration of the extended PDCCH set can be reduced.
- the first RBG index A1 that constitutes the RBG pattern is used as the RBG pattern index. Therefore, the radio base station does not need to perform the RBG pattern index calculation process described in the third aspect. As described above, in the radio communication method according to the fourth aspect, it is possible to reduce the overhead associated with the notification of the resource configuration of the extended PDCCH set while reducing the complexity of the arithmetic processing in the radio base station.
- the radio communication system according to the present embodiment will be described in detail.
- the radio communication method according to the first to fourth aspects described above is applied.
- FIG. 17 is a schematic configuration diagram of a radio communication system according to the present embodiment.
- the radio communication system shown in FIG. 17 is a system including, for example, an LTE system or SUPER 3G.
- carrier aggregation in which a plurality of basic frequency blocks (component carriers) with the system bandwidth of the LTE system as one unit is integrated is applied.
- this radio communication system may be called IMT-Advanced, or may be called 4G, FRA (Future Radio Access).
- the radio communication system 1 includes a radio base station 11 that forms a macro cell C1, and radio base stations 12a and 12b that are arranged in the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. I have. Moreover, the user terminal 20 is arrange
- Communication between the user terminal 20 and the radio base station 11 is performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a wide bandwidth (referred to as an existing carrier or a legacy carrier).
- a carrier with a narrow bandwidth in a relatively high frequency band for example, 3.5 GHz
- the same carrier may be used.
- the wireless base station 11 and each wireless base station 12 are wired or wirelessly connected.
- the radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30.
- the upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto. Further, each radio base station 12 may be connected to a higher station apparatus via the radio base station 11.
- RNC radio network controller
- MME mobility management entity
- the radio base station 11 is a radio base station having a relatively wide coverage, and may be called an eNodeB, a radio base station apparatus, a transmission point, or the like.
- the radio base station 12 is a radio base station having local coverage, and may be called a pico base station, a femto base station, a Home eNodeB, an RRH (Remote Radio Head), a micro base station, a transmission point, or the like. Good.
- RRH Remote Radio Head
- Each user terminal 20 is a terminal that supports various communication schemes such as LTE and LTE-A, and may include not only a mobile communication terminal but also a fixed communication terminal.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- 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 scheme that reduces interference between terminals by dividing the system bandwidth into bands consisting of one or continuous resource blocks for each terminal and using a plurality of terminals with mutually different bands. is there.
- the downlink communication channel includes a PDSCH (Physical Downlink Shared Channel) shared by each user terminal 20 and a downlink L1 / L2 control channel (PDCCH, PCFICH, PHICH, extended PDCCH).
- PDSCH Physical Downlink Shared Channel
- PHICH Physical Hybrid-ARQ Indicator Channel
- PDCCH Physical Downlink Control Channel
- the number of OFDM symbols used for PDCCH is transmitted by PCFICH (Physical Control Format Indicator Channel).
- the HARQ ACK / NACK for PUSCH is transmitted by PHICH (Physical Hybrid-ARQ Indicator Channel).
- PDSCH and PUSCH scheduling information and the like may be transmitted by an extended PDCCH (also called Enhanced Physical Downlink Control Channel, ePDCCH, E-PDCCH, FDM type PDCCH, etc.).
- extended PDCCH also called Enhanced Physical Downlink Control Channel, ePDCCH, E-PDCCH, FDM type PDCCH, etc.
- This enhanced PDCCH enhanced downlink control channel
- PDSCH downlink shared data channel
- the uplink communication channel includes a PUSCH (Physical Uplink Shared Channel) as an uplink data channel shared by each user terminal 20 and a PUCCH (Physical Uplink Control Channel) as an uplink control channel.
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- User data and higher control information are transmitted by this PUSCH.
- downlink radio quality information CQI: Channel Quality Indicator
- ACK / NACK and the like are transmitted by PUCCH.
- FIG. 18 is an overall configuration diagram of the radio base station 10 (including the radio base stations 11 and 12) according to the present embodiment.
- the radio base station 10 includes a plurality of transmission / reception antennas 101 for MIMO transmission, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Yes.
- User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.
- the baseband signal processing unit 104 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 transmission processing, scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing are performed and transferred to each transceiver 103.
- RLC layer transmission processing such as RLC (Radio Link Control) retransmission control transmission processing, MAC (Medium Access Control) retransmission control, for example, HARQ transmission processing, scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing are performed and transferred to each transceiver 103.
- HARQ transmission processing scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing are performed and transferred to each transceiver 103.
- IFFT inverse fast Fourier transform
- the baseband signal processing unit 104 notifies the control information for communication in the cell to the user terminal 20 through the broadcast channel.
- the information for communication in the cell includes, for example, the system bandwidth in the uplink or the downlink.
- Each transmission / reception unit 103 converts the baseband signal output by precoding from the baseband signal processing unit 104 for each antenna to a radio frequency band.
- the amplifier unit 102 amplifies the frequency-converted radio frequency signal and transmits the amplified signal using the transmission / reception antenna 101.
- radio frequency signals received by the respective transmission / reception antennas 101 are amplified by the amplifier units 102 and frequency-converted by the respective transmission / reception units 103. It is converted into a baseband signal and input to the baseband signal processing unit 104.
- the baseband signal processing unit 104 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, RLC layer, and PDCP layer reception processing on user data included in the input baseband signal.
- the data is transferred to the higher station apparatus 30 via the transmission path interface 106.
- the call processing unit 105 performs call processing such as communication channel setting and release, status management of the radio base station 10, and radio resource management.
- FIG. 19 is an overall configuration diagram of the user terminal 20 according to the present embodiment.
- the user terminal 20 includes a plurality of transmission / reception antennas 201 for MIMO transmission, an amplifier unit 202, a transmission / reception unit (reception unit) 203, a baseband signal processing unit 204, and an application unit 205.
- radio frequency signals received by a plurality of transmission / reception antennas 201 are each amplified by an amplifier unit 202, converted in frequency by a transmission / reception unit 203, 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 204.
- downlink user data is transferred to the application unit 205.
- the application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Also, broadcast information in the downlink data is also transferred to the application unit 205.
- uplink user data is input from the application unit 205 to the baseband signal processing unit 204.
- transmission processing for retransmission control H-ARQ (Hybrid ARQ)
- channel coding precoding
- DFT processing IFFT processing
- the like are performed and transferred to each transmission / reception unit 203.
- the transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band.
- the amplifier unit 202 amplifies the frequency-converted radio frequency signal and transmits the amplified signal using the transmitting / receiving antenna 201.
- FIG. 20 is a functional configuration diagram of the baseband signal processing unit 104 and some upper layers included in the radio base station 10 according to the present embodiment. 20 mainly shows a functional configuration for downlink (transmission), the radio base station 10 may include a functional configuration for uplink (reception).
- the radio base station 10 includes an upper layer control information generation unit 300, a data generation unit 301, a channel encoding unit 302, a modulation unit 303, a mapping unit 304, a downlink control information generation unit 305, common control information.
- the control channel multiplexing unit 309 and the interleaving unit 310 may be omitted.
- the higher layer control information generation unit 300 generates higher layer control information for each user terminal 20.
- the upper layer control information is control information that is subjected to upper layer signaling (for example, RRC signaling), and includes, for example, pattern information (described later).
- the data generation unit 301 generates downlink user data for each user terminal 20.
- the downlink user data generated by the data generation unit 301 and the higher layer control information generated by the higher layer control information generation unit 300 are input to the channel coding unit 302 as downlink data transmitted on the PDSCH.
- the channel coding unit 302 performs channel coding on the downlink data for each user terminal 20 according to a coding rate determined based on feedback information from each user terminal 20.
- the modulation unit 303 modulates the channel-coded downlink data according to a modulation scheme determined based on feedback information from each user terminal 20.
- the mapping unit 304 maps the modulated downlink data according to the instruction from the scheduling unit 317.
- the downlink control information generation unit 305 generates UE-specific downlink control information (DCI) for each user terminal 20.
- the UE-specific downlink control information includes PDSCH allocation information (DL grant), PUSCH allocation information (UL grant), and the like.
- the common control information generation unit 306 generates cell-specific common control information.
- the downlink control information generated by the downlink control information generation unit 305 and the common control information generated by the common control information generation unit 306 are input to the channel coding unit 307 as downlink control information transmitted on the PDCCH or the extended PDCCH.
- the channel coding unit 307 performs channel coding on the input downlink control information according to the coding rate instructed from the scheduling unit 317 described later.
- Modulation section 308 modulates the channel-coded downlink control information according to the modulation scheme instructed from scheduling section 317.
- downlink control information transmitted on the PDCCH is input from the modulation unit 308 to the control channel multiplexing unit 309 and multiplexed.
- the downlink control information multiplexed by the control channel multiplexing unit 309 is interleaved by the interleaving unit 310.
- the interleaved downlink control information is input to the IFFT unit 312 together with the measurement reference signal (CSI-RS: Channel State Information-Reference Signal, CRS: Cell specific Reference Signal, etc.) generated by the measurement reference signal generation unit 311. Is done.
- CSI-RS Channel State Information-Reference Signal
- CRS Cell specific Reference Signal, etc.
- the mapping unit 313 maps downlink control information in a predetermined allocation unit (for example, eCCE or eREG) according to an instruction from the scheduling unit 317 described later.
- the mapping unit 313 may map the downlink control information using distributed mapping in accordance with the instruction of the scheduling unit 317, or may map the downlink control information using local mapping (Localized Mapping). .
- the mapped downlink control information includes downlink data transmitted on the PDSCH (that is, downlink data mapped by the mapping unit 304), and a demodulation reference signal (DM-RS) generated by the demodulation reference signal generation unit 314. At the same time, it is input to the weight multiplier 315.
- Weight multiplying section 315 multiplies downlink data transmitted by PDCSH, downlink control information transmitted by enhanced PDCCH, and a demodulation reference signal by a precoding weight specific to user terminal 20, and performs precoding.
- the precoded transmission data is input to the IFFT unit 312 and converted from a frequency domain signal to a time-series signal by inverse fast Fourier transform.
- a cyclic prefix (CP) functioning as a guard interval is inserted by the CP insertion unit 316 into the output signal from the IFFT unit 312 and output to the transmission / reception unit 103.
- CP cyclic prefix
- the scheduling unit 317 performs scheduling of downlink user data transmitted on the PDSCH, downlink control information transmitted on the enhanced PDCCH, and downlink control information transmitted on the PDCCH.
- the scheduling unit 317 includes CSI (Channel State Information) including instruction information from the upper station device 30 and feedback information from each user terminal 20 (for example, CQI (Channel Quality Indicator), RI (Rank Indicator), etc.). ) Etc.), radio resources are allocated.
- CSI Channel State Information
- the scheduling unit 317 configures an extended PDCCH set (resource set) for the user terminal 20.
- the scheduling unit 317 constitutes a setting unit of the present invention.
- scheduling section 317 determines a plurality of PRB pairs that constitute the extended PDCCH set.
- the scheduling unit 317 may determine a plurality of resource block groups (RBGs) each including the plurality of PRB pairs.
- RBGs resource block groups
- upper layer control information generation section 300 generates information indicating the pattern information of a plurality of PRB pairs constituting the extended PDCCH set and the number of PRB pairs (n) constituting the extended PDCCH set. To do.
- the pattern information and information indicating the number of PRB pairs (n) constituting the extended PDCCH set are notified to the user terminal 20 by higher layer signaling (for example, RRC signaling).
- Upper layer control information generation section 300 and transmission / reception section 103 constitute a notification section of the present invention.
- the pattern information may be a PRB pattern index (pattern index) indicating a PRB pattern (resource block pattern) that is a combination of a plurality of PRB pairs determined by the scheduling unit 317 (first and second modes).
- the PRB pattern index may be calculated using, for example, Expression (1) (first aspect).
- the PRB pattern index may be the PRB index of the first PRB pair in the PRB pattern (the second PRB pattern). Embodiment).
- the pattern information may include an RBG pattern index (pattern index) indicating an RBG pattern that is a combination of a plurality of RBGs determined by the scheduling unit 317, and position information of PRB pairs in each RBG (third).
- the RBG pattern index may be calculated using, for example, Expression (1) (third aspect). Further, when the RBG pattern is limited to a combination of n RBGs having the same interval between RBGs, the RBG pattern index may be the RBG index of the first RBG in the RBG pattern (fourth mode).
- FIG. 21 is a functional configuration diagram of the baseband signal processing unit 204 included in the user terminal 20.
- the user terminal 20 includes a CP removing unit 401, an FFT unit 402, a demapping unit 403, a deinterleaving unit 404, a PDCCH demodulating unit 405, an extended PDCCH demodulating unit 406, and a PDSCH demodulating unit 407 as functional configurations for downlink (reception).
- the channel estimation unit 408 is provided.
- the cyclic prefix (CP) is removed from the downlink signal received as reception data from the radio base station 10 by the CP removal unit 401.
- 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 the signal in the time domain to the signal in the frequency domain, and inputs the signal to the demapping unit 403.
- the demapping unit 403 demaps the downlink signal. Note that the demapping process by the demapping unit 403 is performed based on higher layer control information input from the application unit 205.
- the downlink control information output from the demapping unit 403 is deinterleaved by the deinterleaving unit 404.
- the PDCCH demodulation unit 405 performs blind decoding, demodulation, channel decoding, and the like of downlink control information (DCI) output from the deinterleaving unit 404 based on a channel estimation result by a channel estimation unit 408 described later.
- DCI downlink control information
- the extended PDCCH demodulation unit 406 performs blind decoding, demodulation, channel decoding, and the like of downlink control information (DCI) output from the demapping unit 403 based on a channel estimation result by a channel estimation unit 408 described later.
- DCI downlink control information
- the PDSCH demodulation unit 407 performs demodulation, channel decoding, and the like of downlink data output from the demapping unit 403 based on a channel estimation result by a channel estimation unit 408 described later. Specifically, the PDSCH demodulating unit 407 demodulates the PDSCH assigned to the own terminal based on the downlink control information demodulated by the PDCCH demodulating unit 405 or the extended PDCCH demodulating unit 406, and transmits downlink data (downlink) addressed to the own terminal. User data and higher layer control information).
- the channel estimation unit 408 performs channel estimation using a demodulation reference signal (DM-RS), a measurement reference signal (CRS, CSI-RS), and the like.
- Channel estimation section 408 outputs a channel estimation result based on measurement reference signals (CRS, CSI-RS) to PDCCH demodulation section 405.
- channel estimation section 408 outputs the channel estimation result based on the demodulation reference signal (DM-RS) to PDSCH demodulation section 407 and enhanced PDCCH demodulation section 406.
- DM-RS demodulation reference signal
- DM-RS demodulation reference signal
- extended PDCCH demodulation section 406 expands based on higher layer control information (here, pattern information and the number of PRB pairs (n) constituting the extended PDCCH set) input from PDSCH demodulation section 407. A plurality of PRB pairs constituting the PDCCH set are specified. Extended PDCCH demodulation section 406 performs blind decoding on the identified PRB pair to obtain downlink control information. Extended PDCCH demodulation section 406 constitutes a specific section of the present invention.
- extended PDCCH demodulation section 406 has a PRB pattern index (pattern index), the total number (N) of RBGs constituting the system bandwidth, and the number of PRB pairs (n) constituting the extended PDCCH set.
- PRB index index (Ai (1 ⁇ i ⁇ n)) assigned to a plurality of PRB pairs in the PRB pattern (resource block pattern) is specified (first and second modes).
- extended PDCCH demodulation section 406 may specify the PRB index (Ai (1 ⁇ i ⁇ n)) using equations (2-1), (2-2), (2-3),. (First embodiment).
- the extended PDCCH demodulation unit 406 determines the interval between PRB pairs (for example, N / n) and the RPB pattern index.
- the PRB index (Ai (1 ⁇ i ⁇ n)) may be specified by using (second mode).
- extended PDCCH demodulation section 406 has an RBG pattern index (pattern index), the total number (N) of RBGs constituting the system bandwidth, and the number of PRB pairs (n) constituting the extended PDCCH set. And the RBG index (index) (Ai (1 ⁇ i ⁇ n)) attached to the plurality of RBGs in the RBG pattern. Also, extended PDCCH demodulation section 406 may identify a plurality of PRB pairs that constitute an extended PDCCH set based on the RBG index (Ai (1 ⁇ i ⁇ n)) and the position information of the PRB pair in each RBG. Good (third and fourth aspects).
- extended PDCCH demodulation section 406 may specify the RBG index (Ai (1 ⁇ i ⁇ n)) using equations (2-1), (2-2), (2-3),. (Third embodiment). Further, when the RBG pattern is limited to a combination of n RBGs having the same interval between RBGs, the extended PDCCH demodulation unit 406 uses the interval between RBGs (for example, N / n) and the RBG pattern index, An RBG index (Ai (1 ⁇ i ⁇ n)) may be specified (fourth aspect).
- the radio base station indicates the pattern information of a plurality of PRB pairs constituting the extended PDCCH set and the number n of PRB pairs constituting the extended PDCCH set.
- the user terminal UE can specify the PRB pair constituting the extended PDCCH set only by notifying the information. For this reason, the overhead accompanying the notification of the resource structure of an extended PDCCH set can be reduced.
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Abstract
Description
図9-図13を参照し、本発明の第1態様に係る無線通信方法を説明する。第1態様に係る無線通信方法では、無線基地局は、PRBパターン(リソースブロックパターン)を示すPRBパターンインデックス(パターンインデックス)と、当該拡張PDCCHセットを構成するPRBペア数(n)を示す情報と、をユーザ端末UEに通知する。ここで、PRBパターンとは、拡張PDCCHセットを構成するn個のPRBペアの組み合わせである。
図14を参照し、本発明の第2態様に係る無線通信方法を説明する。第2態様に係る無線通信方法は、PRBパターンインデックスと、当該拡張PDCCHセットを構成するPRBペア数(n)を示す情報と、をユーザ端末UEに通知する点で、第1態様と共通する。一方、第2態様に係る無線通信方法は、PRBパターンが、PRBペア間の間隔が等しいn個のPRBペアの組み合わせに制限される点で、第1態様と異なる。以下では、第1態様との相違点を中心に説明する。
図15を参照し、本発明の第3態様に係る無線通信方法を説明する。第3態様に係る無線通信方法では、無線基地局は、PRBパターンインデックスに代えて、RBGパターンを示すRBGパターンインデックス(パターンインデックス)及びリソースブロックグループ(RBG)内のリソースブロックの位置情報を、ユーザ端末UEに通知する点で第1態様と異なる。ここで、RBGパターンとは、拡張PDCCHセットを構成するn個のPRBペアをそれぞれ含む複数のRBGの組み合わせである。以下では、第1態様との相違点を中心に説明する。
図16を参照し、本発明の第4態様に係る無線通信方法を説明する。第4態様に係る無線通信方法は、RBGパターンインデックスとRBG内におけるPRBペアの位置情報とをユーザ端末UEに通知する点で、第3態様と共通する。一方、第4態様に係る無線通信方法は、RBGパターンが、RBG間の間隔が等しいn個のRBGの組み合わせに制限される点で、第3態様と異なる。以下では、第3態様との相違点を中心に説明する。
図17は、本実施の形態に係る無線通信システムの概略構成図である。なお、図17に示す無線通信システムは、例えば、LTEシステム或いは、SUPER 3Gが包含されるシステムである。この無線通信システムでは、LTEシステムのシステム帯域幅を1単位とする複数の基本周波数ブロック(コンポーネントキャリア)を一体としたキャリアアグリゲーションが適用される。また、この無線通信システムは、IMT-Advancedと呼ばれても良いし、4G、FRA(Future Radio Access)と呼ばれても良い。
Claims (14)
- 下り共有データチャネルに周波数分割多重される拡張下り制御チャネルを用いて、ユーザ端末に対する下り制御情報を送信する無線基地局であって、
前記ユーザ端末に対して、前記拡張下り制御チャネルに割り当てられる複数のリソースブロックを含んで構成されるリソースセットを設定する設定部と、
前記ユーザ端末に対して、前記リソースセットを構成する前記複数のリソースブロックのパターン情報と、前記リソースセットを構成するリソースブロック数(n)を示す情報とを通知する通知部と、
を具備することを特徴とする無線基地局。 - 前記パターン情報は、前記複数のリソースブロックの組み合わせであるリソースブロックパターンを示すパターンインデックスであることを特徴とする請求項1に記載の無線基地局。
- 前記パターンインデックスは、システム帯域幅を構成するリソースブロックの総数(N)と、前記リソースブロック数(n)と、前記リソースブロックパターン内の前記複数のリソースブロックに付されたインデックス(Ai(1≦i≦n))と、に基づいて算出されることを特徴とする請求項2に記載の無線基地局。
- 前記リソースブロックパターンは、前記複数のリソースブロック間の間隔が等しい前記複数のリソースブロックの組み合わせであり、
前記パターンインデックスは、前記リソースブロックパターン内の1番目のリソースブロックに付されたインデックス(A1)であることを特徴とする請求項2に記載の無線基地局。 - 前記パターン情報は、前記複数のリソースブロックをそれぞれ含む複数のリソースブロックグループ(RBG)の組み合わせであるRBGパターンを示すパターンインデックスと、前記複数のRBGそれぞれにおける前記複数のリソースブロックの位置情報と、を含むことを特徴とする請求項1に記載の無線基地局。
- 前記パターンインデックスは、前記システム帯域幅を構成するリソースブロックグループ(RBG)の総数(N)と、前記リソースブロック数(n)と、前記RBGパターン内の前記複数のRBGに付されたインデックス(Ai(1≦i≦n))と、に基づいて算出されることを特徴とする請求項5に記載の無線基地局。
- 前記RBGパターンは、前記複数のRBG間の間隔が等しい前記複数のRBGの組み合わせであり、
前記パターンインデックスは、前記RBGパターン内の1番目のRBGに付されたインデックス(A1)であることを特徴とする請求項5に記載の無線基地局。 - 前記通知部は、上位レイヤシグナリングを用いて、前記パターン情報と前記リソースブロック数(n)を示す情報とを通知することを特徴とする請求項1に記載の無線基地局。
- 下り共有データチャネルに周波数分割多重される拡張下り制御チャネルを用いて、無線基地局から下り制御情報を受信するユーザ端末であって、
前記拡張下り制御チャネルに割り当てられる複数のリソースブロックを含んで構成されるリソースセットが前記ユーザ端末に設定される場合、前記無線基地局から、前記リソースセットを構成する前記複数のリソースブロックのパターン情報と、前記リソースセットを構成するリソースブロック数(n)を示す情報とを受信する受信部と、
前記パターン情報と前記リソースブロック数(n)とに基づいて、前記複数のリソースブロックを特定する特定部と、
を具備することを特徴とするユーザ端末。 - 前記パターン情報は、前記複数のリソースブロックの組み合わせであるリソースブロックパターンを示すパターンインデックスであり、
前記特定部は、該パターンインデックスと、システム帯域幅を構成するリソースブロックの総数(N)と、前記リソースブロック数(n)とに基づいて、前記リソースブロックパターン内の前記複数のリソースブロックに付されたインデックス(Ai(1≦i≦n))を特定し、該インデックス(Ai(1≦i≦n))に基づいて、前記複数のリソースブロックを特定することを特徴とする請求項9に記載のユーザ端末。 - 前記パターン情報は、前記複数のリソースブロックをそれぞれ含む複数のリソースブロックグループ(RBG)の組み合わせであるRBGパターンを示すパターンインデックスと、前記複数のRBGそれぞれにおける前記複数のリソースブロックの位置情報と、を含み、
前記特定部は、前記パターンインデックスと、システム帯域幅を構成するリソースブロックグループ(RBG)の総数(N)と、前記リソースブロック数(n)と、に基づいて、前記RBGパターン内の前記複数のRBGに付されたインデックス(Ai(1≦i≦n))を特定し、該インデックス(Ai(1≦i≦n)と前記位置情報とに基づいて、前記複数のリソースブロックを特定することを特徴とする請求項9に記載のユーザ端末。 - 前記受信部は、上位レイヤシグナリングを用いて、前記パターン情報と前記リソースブロック数(n)を示す情報を受信することを特徴とする請求項9に記載のユーザ端末。
- 下り共有データチャネルに周波数分割多重される拡張下り制御チャネルを用いて、無線基地局がユーザ端末に対する下り制御情報を送信する無線通信システムであって、
前記無線基地局は、前記ユーザ端末に対して、前記拡張下り制御チャネルに割り当てられる複数のリソースブロックを含んで構成されるリソースセットを設定する設定部と、前記ユーザ端末に対して、前記リソースセットを構成する前記複数のリソースブロックのパターン情報と、前記リソースセットを構成するリソースブロック数(n)を示す情報とを通知する通知部と、を具備し、
前記ユーザ端末は、前記パターン情報と前記リソースブロック数(n)とに基づいて、前記複数のリソースブロックを特定する特定部と、を具備することを特徴とする無線通信システム。 - 下り共有データチャネルに周波数分割多重される拡張下り制御チャネルを用いて、無線基地局がユーザ端末に対する下り制御情報を送信する無線通信方法であって、
前記無線基地局において、前記ユーザ端末に対して、前記拡張下り制御チャネルに割り当てられる複数のリソースブロックを含んで構成されるリソースセットを設定する工程と、前記ユーザ端末に対して、前記リソースセットを構成する前記複数のリソースブロックのパターン情報と、前記リソースセットを構成するリソースブロック数(n)を示す情報とを通知する工程と、
前記ユーザ端末において、前記パターン情報と前記リソースブロック数(n)を示す情報とに基づいて、前記複数のリソースブロックを特定する工程と、
を有することを特徴とする無線通信方法。
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