WO2007108392A1 - 無線通信基地局装置およびパイロット配置方法 - Google Patents
無線通信基地局装置およびパイロット配置方法 Download PDFInfo
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- WO2007108392A1 WO2007108392A1 PCT/JP2007/055187 JP2007055187W WO2007108392A1 WO 2007108392 A1 WO2007108392 A1 WO 2007108392A1 JP 2007055187 W JP2007055187 W JP 2007055187W WO 2007108392 A1 WO2007108392 A1 WO 2007108392A1
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- pilot
- data
- subcarrier
- base station
- multicast
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Classifications
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
-
- 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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
Definitions
- the present invention relates to a radio communication base station apparatus and a pilot arrangement method.
- OFDM Orthogonal Frequency
- Multi-carrier communication represented by a division multiplexing system has attracted attention.
- data is transmitted using a plurality of subcarriers whose transmission rates are suppressed to a certain extent without frequency selective fading.
- the OFDM scheme has the highest frequency utilization efficiency among multi-carrier communications because the frequencies of multiple subcarriers on which data is arranged are orthogonal to each other, and has a relatively simple hardware configuration. Multi-carrier communication can be realized. For this reason, the OFDM method has attracted attention as a communication method adopted for cellular mobile communication, and various studies have been made.
- the receiving side can prevent ISI as long as the delay time of the delayed wave is within the CP time length (hereinafter referred to as CP length).
- CP length CP time length
- Multicast communication is one-to-many communication rather than one-to-one communication such as unicast communication. That is, in multicast communication, one radio communication base station device (hereinafter abbreviated as a base station) transmits the same data simultaneously to a plurality of radio communication mobile station devices (hereinafter abbreviated as mobile stations) To do.
- a base station transmits the same data simultaneously to a plurality of radio communication mobile station devices (hereinafter abbreviated as mobile stations) To do.
- a music data / video image data distribution service a broadcast service such as a television broadcast, and the like are realized in the mobile communication system.
- multicast data is the same data in a plurality of cells.
- the same multicast data is simultaneously transmitted from a plurality of base stations, so that a mobile station located near a cell boundary receives the mixed data from the plurality of base stations.
- a mobile station located near a cell boundary receives a plurality of identical OFDM symbols transmitted simultaneously from a plurality of base stations with a time difference within the CP length. These OFDM symbols are combined and received with the received power amplified.
- a channel estimation value of the synthesized signal is required. Therefore, in multicast communication using the OFDM scheme, the same pilot needs to be transmitted simultaneously from a plurality of base stations, as with the multicast data, for the pilot used to obtain the channel estimation value.
- the pilot for multicast data needs to be a common pilot for multiple cells.
- unicast data a plurality of base stations transmit different data (unicast data) (see Non-Patent Document 1).
- the unicast data is different from each other for each of a plurality of cells.
- the unicast data includes, for example, control data necessary for transmitting user data from a mobile station. Therefore, in the unicast communication, it is necessary to transmit different pilots from a plurality of base stations in the same manner as the unicast data for the pilot used to obtain the channel estimation value. In other words, the unicast data pilots need to be different for each of the plurality of cells.
- Multi-carrier Broadcast communications are all mobile like current television broadcasts and radio broadcasts, whereas strike communications are used to transmit information only to specific mobile stations that have subscribed to the service, such as newsnorepe.
- the communication form is such that information is transmitted to the station.
- multicast and broadcast are the same in that one base station transmits the same data to multiple mobile stations simultaneously. Therefore, in this document, multi-carrier
- Non-Patent Document 1 3GPP TSG RAN WGl LTE Ad Hoc Meeting (2005.06) Rl- 050589 "Pil ot channel and scrambling code in evolved UTRA downlink
- Non-Patent Document 2 3GPP TSG RAN WGl LTE Ad Hoc Meeting (2006.01) Rl- 060182 "M BMS Structure for Evolved UTRA"
- the unicast data pilots are different pilots for each of the plurality of cells as described above. Therefore, in order to reduce interference between unicast data pilots between cells.
- the pilot for nicast data is transmitted with relatively large power.
- the multicast data pilot is a pilot common to a plurality of cells as described above, interference between the multicast data pilots between cells does not occur. For this reason, the pilot for multicast data is transmitted with relatively small power.
- the unicast data pilot interferes with the multicast data pilot, and as a result, for the multicast data to be performed using the multicast data pilot.
- the accuracy of channel estimation may deteriorate.
- An object of the present invention is to provide a base station and a pilot arrangement method that can prevent deterioration in channel estimation accuracy of multicast data due to interference from a pilot for unicast data.
- the base station of the present invention includes a first multicarrier signal having different first data (unicast data) for each of a plurality of cells and second data (multicast data) identical to each other in the plurality of cells. ) And a second multi-carrier signal consisting of a first pilot for the first data (unicast data pilot) and a second pilot for the second data ( A pilot means for generating multicast data), and a two-dimensional plane composed of a frequency axis and a time axis, at which the first pilot port (unicast data pilot) is not subject to interference. And an arrangement means for arranging two pilots (multicast data pilots).
- the pilot arrangement method of the present invention includes a first multicarrier signal composed of different first data (unicast data) for each of a plurality of cells, and the same second data for each of the plurality of cells.
- a pilot arrangement method in a base station that time-multiplexes and transmits a second multicarrier signal made up of (multicast data), wherein the pilot for the first data ( (Unicast data pilot)
- the pilot for the second data (multicast data pilot) is arranged at a position where it is not affected by force interference.
- the present invention it is possible to prevent the deterioration of channel estimation accuracy of the second data (multicast data) due to interference from the first data pilot (unicast data pilot).
- FIG. 1 is a block configuration diagram of a base station according to Embodiment 1 of the present invention.
- FIG. 7 is a block configuration diagram of a base station according to Embodiment 2 of the present invention.
- the power of explaining the OFDM system as an example of the multicarrier communication system is not limited to the OFDM system.
- a base station is used in an OFDM mobile communication system, and OFDM symbol data in which unicast data is arranged in a plurality of subcarriers and multicast data in a plurality of subcarriers.
- FIG. 1 shows the configuration of base station 100 according to the present embodiment.
- Encoding section 101 encodes the unicast data and outputs the encoded data to modulation section 102.
- Modulation section 102 modulates the encoded unicast data to generate a unicast data symbol, and outputs it to arrangement section 106.
- Encoding section 103 encodes multicast data and outputs the encoded data to modulation section 104.
- Modulating section 104 modulates the encoded multicast data to generate a multicast data symbol, and outputs the multicast data symbol to arranging section 106.
- the pilot generating unit 105 includes a unicast pilot generating unit 105-1 and a multicast pilot generating unit 105-2.
- the unicast pilot generating unit 105-1 generates a unicast data pilot and outputs it to the arranging unit 106.
- Multicast pilot generating section 105-2 generates a pilot for multicast data and outputs it to arranging section 106.
- Arrangement section 106 transmits a unicast data symbol, a multicast data symbol, a unicast data pilot, and a multicast data pilot to the frequency axis and time.
- An IFFT (Inverse Fast Fourier Transform) unit 107 outputs the signal to any position on a two-dimensional plane composed of a space axis.
- the frequency axis corresponds to the multiple subcarriers composing the lOFDM symbol
- the time axis corresponds to the multiple OFDM symbols transmitted in order. That is, arrangement section 106 arranges a unicast data symbol, a multicast data symbol, a unicast data pilot, and a multicast data pilot in each of a plurality of subcarriers in a plurality of OFDM symbols.
- the arrangement unit 106 arranges the unicast data symbol and the multicast data symbol on subcarriers of mutually different OFDM symbols, so that the unicast data symbol and the multicast data symbol are time-multiplexed. Details of the placement process will be described later.
- IFFT section 107 performs IFFT on a plurality of subcarriers in which a unicast data symbol, a multicast data symbol, a unicast data pilot and a multicast data pilot are arranged, and converts it to a time domain signal. Then, OFDM symbols that are multicarrier signals are generated.
- the processing in the placement section 106 is the OFDM symbol in which the unicast data symbol and the unicast data pilot are frequency multiplexed, and the OFDM symbol in which the multicast data symbol and the multicast data pilot are frequency multiplexed.
- an OFDM symbol in which a multicast data symbol and a unicast data pilot are frequency-multiplexed, and an OFDM symbol that only powers the multicast data symbol are generated.
- these OFDM symbols are time-multiplexed by the processing in arrangement section 106 and input to CP adding section 108.
- CP adding section 108 adds the same signal as the tail part of the OFDM symbol to each OFDM symbol as a CP at the beginning of the OFDM symbol.
- Radio transmitting section 109 performs transmission processing such as D / A conversion, amplification and up-conversion on the OFDM symbol after CP addition, and transmits the result from antenna 110 to the mobile station.
- Arrangement section 106 arranges the multicast data pilot at a position that does not receive interference from the unicast data pilot on a two-dimensional plane composed of the frequency axis and the time axis. Arrangement example 1 below ⁇ 5 will be described. In the following description, lOFDM symbols are assigned to subcarriers f to f.
- An example composed of 19 subcarriers is shown.
- one subframe is composed of 80 FDM symbols of OFDM symbols # 1 to # 8.
- an OFDM symbol composed of unicast data symbols (u) is referred to as a unicast OFDM symbol and a relay
- an OFDM symbol composed of multicast data symphonies (m) is referred to as a multicast ⁇ F DM simponore.
- a pilot for unicast data is arranged on one of a plurality of subcarriers constituting a unicast OFDM symbol, and the unicast OFDM symbol is not adjacent to the unicast OFDM symbol. Then, a pilot for multicast data is arranged on one of a plurality of subcarriers constituting a multicast OFDM symbol.
- the multicast data is transmitted to the subcarrier having the same frequency as the subcarrier in which the unicast data pilot is arranged in the unicast OFDM symbol. It is even better to place a pilot.
- Multicarrier OFDM symbol # 3 subcarriers f and f that are not adjacent to DM symbol # 1
- F should be a pilot for multicast data (PL).
- unicast data is also transmitted to subcarriers f and f of multicast OFDM symbol # 5.
- a pilot (PL) should be placed.
- a pilot for unicast data is arranged in one of the multiple subcarriers that make up the unicast OFDM symbol, and the unicast OFDM symbol among the multiple subcarriers that make up the multicast FDM symbol.
- the multicast data pilot is allocated to a subcarrier having a frequency different from that of the subcarrier in which the duplex cast data pilot is allocated.
- a pilot for multicast data on a subcarrier of a multicast OFDM adjacent on the time axis to a unicast OFDM symbol including a pilot for unicast data.
- a pilot for multicast data should be placed in 14-14.
- the unicast data pilot and the multicast data pilot are arranged on a time axis. Since the mobile station can receive the pilot for the unicast data and the pilot for the multicast data together within 20 FDM symbol time because it is arranged on the subcarriers of the OFDM symbols adjacent to each other above, the pilot The time required for reception can be shortened. As a result, the power consumption related to pilot reception can be reduced.
- unicast data is also transmitted to subcarriers f and f of multicast OFDM symbol # 5.
- multicast data is sent to subcarriers f 1, f 2 and f of multicast OFDM symbol # 6 adjacent to multicast OFDM symbol # 5
- a pilot (PL) should be placed.
- This arrangement example is a combination of arrangement example 1 and arrangement example 2. That is, in this arrangement example, a pilot for ducast data is arranged on one of a plurality of subcarriers constituting a unicast OFDM symbol, and a plurality of multicast OFDM symbols that are not adjacent to the unicast OFDM symbol on the time axis are arranged. Among these subcarriers, a multicast data pilot is placed on a subcarrier having a frequency different from that of the subcarrier in which the unicast data pilot is arranged in the unicast OFDM symbol.
- Multicarrier OFDM symbol # 3 subcarriers f and f that are not adjacent to DM symbol # 1
- a multicast data pilot (PL) is assigned to 1.
- unicast data is also transmitted to subcarriers f and f of multicast OFDM symbol # 5.
- pilot (PLj) is allocated, multicast data is sent to subcarriers f 1, f 2, and 5 f of multicast OFDM symbol # 7 that are not adjacent to multicast OFDM symbol # 5.
- the multicast data pilot is arranged at the subcarrier of the same frequency as that of the subcarrier in the other base station of the adjacent cell.
- the unicast data pilot is arranged on a subcarrier having a frequency different from that of the subcarrier on which the multicast data pilot is arranged in the multicast OFDM symbol.
- Fig. 5A is an example of arrangement in the base station of cell # 1
- Fig. 5B and Fig. 5C are examples of arrangement in cell # 2 and cell # 3, which are adjacent to each other, in other base stations, respectively. It is.
- base station 100 (FIG. 1) is a base station of cell # 1.
- the arrangement positions of the pilots for multicast data in the same subframe are the same in a plurality of base stations in adjacent cells. For example, as shown in FIGS. 5A to 5C, in subframe # 1, all base stations in cell # 1 to cell # 3 receive multicast data packets on subcarriers f and f of multicast OFDM symbol # 2.
- the multicast data pilot P
- the base station of cell # 1 performs the multicast data pilot (PL m ).
- Subcarriers with different frequencies from subcarriers f and f where pilots for cast data are arranged
- Unicast data pilots are arranged in the rear f, f, and f. Cell # 2, cell # 3 The same applies to the base stations (FIGS. 5B and 5C).
- the pilots for multicast data are arranged on the frequency axis.
- the unicast data pilot can be prevented from receiving interference from the unicast data pilot.
- the unicast OFDM symbols # 1 are configured in a plurality of subcarriers f to f. Select the subcarrier to place the pilot (PL) for the cast data.
- the base station in cell # 2 is the subcarrier f, f of unicast OFDM symbol # 1
- F is assigned the pilot (PL) for unicast data (Fig. 5C).
- the base station in cell # 1 also transmits unicast data to subcarriers f and f of multicast OFDM symbol # 5.
- a pilot (PL) for the motor is arranged (Fig. 5A). The same applies to the base stations of Senole # 2 and Cell # 3 (Figs. 5B and 5C).
- a pilot for multicast data is always arranged on a subcarrier of the same frequency among a plurality of subcarriers constituting a multicast OFDM symbol, while a multi-carrier among a plurality of subcarriers constituting a Unicast OFDM symbol is arranged.
- a unicast data pilot is allocated to a subcarrier having a frequency different from that of the subcarrier in which the multicast data pilot is allocated, and the subcarrier in which the unicast data pilot is allocated changes over time.
- FIGS. 6A, 6B, and 6C are arrangement examples in subframes # 1, # 2, and # 3, respectively. Normally, one frame is composed of 20 subframes of subframes # 1 to # 20.
- the arrangement positions of the pilots for multicast data are the same in all subframes.
- a multicast data payload is always placed on a subcarrier of the same frequency among a plurality of subcarriers constituting a multicast OFDM symbol.
- multicast is performed on subcarriers f and f of multicast OFDM symbol # 2.
- Subcarriers with different frequency from subcarriers f and f where pilots for multicast data are arranged
- a pilot (PL) for unicast data is arranged on carriers f 1, f 2, and f.
- the unicast data pilot (PL) is allocated to subcarriers f and f of unicast OFDM symbol # 1, and in subframe # 3, Fig. 6C
- the unicast OFDM symbol # 1 has subcarriers f 1 and f 2
- a pilot (PL) for data is arranged.
- the subcarrier in which the pilot for unicast data is arranged is changed for each subframe, so that the interpolation accuracy on the frequency axis of the channel estimation value for unicast data is improved. Can do.
- multicast data pilot (PL) is also transmitted to subcarriers f 1, f 2, and f 2 of multicast 0 FDM symbol # 6
- the subcarriers f and f of multicast OFDM symbol # 5 are also used for unicast data.
- a pilot (PL) should be placed. The same applies to subframes # 2 and # 3 (Fig.
- the mobile station When the OFDM scheme is used for multicast communication as described above, the mobile station receives a plurality of identical multicast OFDM symbols transmitted from a plurality of base stations simultaneously. Therefore, the multicast data has greater fading frequency selectivity than the unicast data. Therefore, a larger number of multicast data pilots are required on the frequency axis than the unicast data pilots.
- the reception SIR Signal to Interference Ratio
- the base station can reduce the transmission power of multicast data. The same is true between the pilot for multicast data and the pilot for unicast data.
- FIG. 7 shows the configuration of base station 300 according to the present embodiment.
- the same components as in FIG. 1 (Embodiment 1) are assigned the same reference numerals as in FIG. 1, and descriptions thereof are omitted.
- Multicast pilot generating section 105-2 generates a pilot for multicast data and outputs it to transmission power control section 301.
- Transmission power control section 301 controls the transmission power of the multicast data pilot, and outputs the multicast data pilot after the transmission power control to arrangement section 302.
- Transmission power control section 301 reduces the transmission power of each multicast data pilot as the number of multicast data pilots arranged on a plurality of subcarriers constituting the multicast OFDM symbol increases. For example, when five multicast data pilots are arranged on a plurality of subcarriers constituting a multicast OFDM symbol, the transmission power control unit 301 sets the transmission power of each of the five multicast data pilots to three multicast data. Control the transmission power to 3/5 of the transmission power when data pilots are deployed.
- allocating section 302 has a larger number of pilots for multicast data (PL) than the pilots for unicast data (PL) allocated to a plurality of subcarriers constituting unicast OFDM symbol # 1.
- PL multicast OFDM symbol # 2
- FIG. 8 shows an arrangement example in which the number of multicast data pilots is increased from three to five based on arrangement example 1 (FIG. 2) of the first embodiment. Can be implemented in combination with any of the arrangement examples of the first embodiment:! To 5.
- the present invention is similar to the above in a mobile communication system in which broadcast data and unicast data are multiplexed by replacing “multicast” used in the description of the above embodiments with “broadcast”. Can be implemented.
- the mobile communication system in which MBMS data and unicast data are multiplexed is used. The light can be carried out in the same manner as described above.
- the CP in the above embodiment may be referred to as a guard interval (GI).
- the subcarrier may be referred to as a tone.
- the base station may be represented as Node B, and the mobile station may be represented as UE.
- Each functional block used in the description of the above embodiment is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them.
- the name used here is LSI, but it may also be called IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible.
- An FPGA Field Programmable Gate Array
- reconfigurable 'processor that can reconfigure the connection and settings of circuit cells inside the LSI may be used.
- the present invention can be applied to a mobile communication system or the like.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07738637A EP1988729A4 (en) | 2006-03-17 | 2007-03-15 | WIRELESS COMMUNICATION BASE STATION DEVICE AND PILOT SIGNAL POSITIONING METHOD |
US12/282,476 US8897251B2 (en) | 2006-03-17 | 2007-03-15 | Wireless communication base station apparatus and pilot signal disposing method |
JP2008506265A JP4892547B2 (ja) | 2006-03-17 | 2007-03-15 | 無線通信基地局装置およびパイロット配置方法 |
Applications Claiming Priority (2)
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JP2006075504 | 2006-03-17 | ||
JP2006-075504 | 2006-03-17 |
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WO2007108392A1 true WO2007108392A1 (ja) | 2007-09-27 |
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PCT/JP2007/055187 WO2007108392A1 (ja) | 2006-03-17 | 2007-03-15 | 無線通信基地局装置およびパイロット配置方法 |
Country Status (5)
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US (1) | US8897251B2 (ja) |
EP (1) | EP1988729A4 (ja) |
JP (1) | JP4892547B2 (ja) |
CN (1) | CN101406016A (ja) |
WO (1) | WO2007108392A1 (ja) |
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WO2009094135A3 (en) * | 2008-01-24 | 2009-10-15 | Alcatel-Lucent Usa Inc. | Channel estimation using common and dedicated pilot channels |
JP2012080585A (ja) * | 2006-04-28 | 2012-04-19 | Nec Corp | 通信方法、無線通信システム、無線通信装置及び移動局 |
WO2014024502A1 (ja) * | 2012-08-10 | 2014-02-13 | パナソニック株式会社 | Ofdm送信装置、ofdm送信方法、ofdm受信装置、及びofdm受信方法 |
JP2016174274A (ja) * | 2015-03-17 | 2016-09-29 | 日本電信電話株式会社 | ネットワークシステム及びコンテンツ配信方法 |
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JP2012080585A (ja) * | 2006-04-28 | 2012-04-19 | Nec Corp | 通信方法、無線通信システム、無線通信装置及び移動局 |
JP2012199987A (ja) * | 2006-04-28 | 2012-10-18 | Nec Corp | パイロット信号送信方法、無線通信システム、基地局、移動局及び通信方法 |
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KR101117515B1 (ko) | 2008-01-24 | 2012-03-16 | 알카텔-루센트 유에스에이 인코포레이티드 | 공용 및 전용 파일럿 채널들을 이용하는 채널 추정 |
US9240909B2 (en) | 2008-01-24 | 2016-01-19 | Alcatel Lucent | Reverse link channel estimation using common and dedicated pilot channels |
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JP2016174274A (ja) * | 2015-03-17 | 2016-09-29 | 日本電信電話株式会社 | ネットワークシステム及びコンテンツ配信方法 |
Also Published As
Publication number | Publication date |
---|---|
CN101406016A (zh) | 2009-04-08 |
EP1988729A4 (en) | 2012-04-11 |
JPWO2007108392A1 (ja) | 2009-08-06 |
US8897251B2 (en) | 2014-11-25 |
JP4892547B2 (ja) | 2012-03-07 |
US20090060077A1 (en) | 2009-03-05 |
EP1988729A1 (en) | 2008-11-05 |
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