WO2005083907A1 - 移動局装置および移動局装置における送信アンテナ選択方法 - Google Patents
移動局装置および移動局装置における送信アンテナ選択方法 Download PDFInfo
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- WO2005083907A1 WO2005083907A1 PCT/JP2005/002765 JP2005002765W WO2005083907A1 WO 2005083907 A1 WO2005083907 A1 WO 2005083907A1 JP 2005002765 W JP2005002765 W JP 2005002765W WO 2005083907 A1 WO2005083907 A1 WO 2005083907A1
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Classifications
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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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0868—Hybrid systems, i.e. switching and combining
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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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0602—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using antenna switching
- H04B7/0608—Antenna selection according to transmission parameters
-
- 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
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
- H04B7/0817—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
- H04B7/082—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection selecting best antenna path
Definitions
- Mobile station apparatus and transmission antenna selection method in mobile station apparatus are Mobile station apparatus and transmission antenna selection method in mobile station apparatus
- the present invention relates to a mobile station device and a transmission antenna selection method in the mobile station device.
- each frame is distinguished into an uplink frame (a transmission frame of a mobile station, a reception frame of a base station) and a downlink frame (a reception frame of a mobile station, a transmission frame of a base station). Is done. Also, in the TDD scheme, since the uplink signal and the downlink signal are communicated in the same frequency band, the propagation paths of the uplink signal and the downlink signal are the same. Taking advantage of the characteristics of the TDD scheme, in a base station with two antennas, the antenna with the higher received power of the uplink signal (that is, the antenna with the better propagation path condition) is switched to the downlink signal.
- Patent Document 1 JP-A-2000-353994
- An object of the present invention is to provide a mobile station apparatus and a transmission antenna selection method in the mobile station apparatus that can increase the capacity of a communication system when performing high-speed packet transmission on the uplink.
- a mobile station apparatus includes a plurality of amplifiers that receive both a signal transmitted from a first base station and a signal transmitted from a second base station in a cell adjacent to a cell of the first base station.
- a antenna, a selection unit for selecting an antenna having the smallest interference with the adjacent cell among the plurality of antennas of the own station, and a transmission unit for transmitting a signal from the selected antenna to the first base station. are adopted.
- FIG. 1 is a configuration diagram of a mobile communication system according to Embodiment 1 of the present invention.
- FIG. 2 is a block diagram showing a configuration of a mobile station according to Embodiment 1 of the present invention.
- FIG. 3 is a block diagram showing a configuration of a mobile station according to Embodiment 2 of the present invention.
- FIG. 4 is a simulation result of interference power versus cumulative probability distribution according to Embodiment 2 of the present invention.
- FIG. 5 is a configuration diagram of a mobile communication system according to Embodiment 3 of the present invention.
- FIG. 6 is a block diagram showing a configuration of a mobile station according to Embodiment 3 of the present invention.
- FIG. 7 is a block diagram showing a configuration of a mobile station according to Embodiment 4 of the present invention.
- FIG. 8 is a block diagram showing a configuration of a mobile station according to Embodiment 5 of the present invention.
- FIG. 9 is a table showing a correspondence relationship between an MCS level and received power according to Embodiment 5 of the present invention.
- FIG. 10 is a flowchart showing an operation of the mobile station according to Embodiment 5 of the present invention.
- FIG. 11 is a block diagram showing a configuration of a mobile station according to Embodiment 6 of the present invention.
- FIG. 12 is a block diagram showing another configuration of the mobile station according to Embodiment 6 of the present invention.
- FIG. 1 is a configuration diagram of a mobile communication system according to Embodiment 1 of the present invention.
- the mobile communication system includes a mobile station, a base station 1, and a base station 2, and communication between the mobile station and each base station is performed by a TDD scheme.
- Mobile station 1 has two antennas, and base station 1 and base station 2 have one antenna.
- the mobile station receives the downlink signal on both antenna 1 and antenna 2 and transmits the uplink signal from either antenna 1 or antenna 2.
- the mobile station is currently accommodated in the cell of base station 1, and the mobile station is currently communicating and the base station 1 is the destination of the uplink signal from the mobile station.
- the base station 2 is a base station of a cell adjacent to the cell of the base station 1.
- the mobile station selects one of antennas 1 and 2 that has less interference with the cell (adjacent cell) of base station 2 as a transmitting antenna, and selects the base station from the selected antenna.
- An uplink signal is transmitted for 1.
- the uplink signal transmitted to the base station 1 is, for example, high-speed packet data.
- r is the base station
- the neighboring cell is a cell having a plurality of powers around the cell of the base station 1.
- the neighboring cell here is a cell having the largest received power other than the cell of the base station 1, and this neighboring cell is detected by cell search. .
- FIG. 2 is a block diagram showing a configuration of the mobile station according to Embodiment 1 of the present invention.
- Each of antenna 1 and antenna 2 receives both the downlink signal transmitted from base station 1 and the downlink signal transmitted from base station 2.
- a transmission / reception switching section 101, a reception radio processing section 102, an adjacent cell pilot extraction section 103, a reception power measurement section 104, a pilot extraction section 105, a channel estimation section 106, and a demodulation section 107 are provided corresponding to the antenna 1.
- transmission / reception switching section 201, reception radio processing section 202, adjacent cell pilot extraction section 203, reception power measurement section 204, pilot extraction section 205, channel estimation section 206, and demodulation section 207 are provided corresponding to antenna 2. Let's do it.
- Transmission / reception switching section 101 switches transmission / reception of antenna 1, inputs a downlink signal received by antenna 1 to a reception radio processing section 102 in a reception frame, and transmits a transmission radio processing section in a transmission frame.
- the uplink signal input from 403 is transmitted from antenna 1 to base station 1.
- the reception radio processing unit 102 downconverts the received signals r and r.
- Adjacent cell pilot extraction section 103 is included in received signal r
- Pilot signal p that is, transmitted from base station 2 in the adjacent cell and received by antenna 1 in the mobile station
- This extraction is assigned to the pilot signal p in the case of CDMA.
- Received power measurement unit 1 This is performed by extracting the subcarrier assigned to the signal p.
- Pilot extraction section 105 generates pilot signal p (that is, base station
- a pilot signal transmitted from 1 and received by antenna 1 of the mobile station) is extracted, and extracted pilot signal p is input to channel estimation section 106.
- the channel estimation unit 106 The channel estimation unit 106
- the channel estimation value between the antenna 1 and the base station 1 is obtained using the Enter in 07.
- Demodulation section 107 demodulates received signal r while performing phase rotation compensation and the like based on the input channel estimation value.
- Demodulation unit 107 uses CDMA
- the received signal In the case of the OFDM system, the received signal
- the generated reception symbol is input to the combining unit 301.
- transmission / reception switching section 201 switches transmission / reception of antenna 2, inputs a downlink signal received by antenna 2 to reception radio processing section 202 in a reception frame, and transmits transmission radio processing section 202 in a transmission frame.
- the uplink signal input from 403 is transmitted from antenna 2 to base station 1.
- Receive radio processing section 202 down-converts received signals r and r.
- a predetermined radio process such as Bert is performed, and input to adjacent cell pilot extraction section 203, pilot extraction section 205, and demodulation section 207.
- Adjacent cell pilot extraction section 203 includes
- Measuring section 204 calculates the received power of pilot signal p.
- Pilot extraction section 205 outputs pilot signal p (ie, base station
- a pilot signal transmitted from 1 and received by the mobile station antenna 2) is extracted, and the extracted pilot signal p is input to the channel estimator 206.
- the channel estimator 206 The channel estimator 206
- the channel estimation value between the antenna 2 and the base station 1 is obtained using the
- Demodulation section 207 demodulates received signal r while performing phase rotation compensation and the like based on the input channel estimation value.
- Demodulation unit 207 uses the CDMA method
- the received signal In the case of the OFDM system, the received signal
- combining section 301 the received symbols input from demodulating section 107 and the received symbols input from demodulating section 207 are combined, and the combined symbols are decoded in decoding section 302. As a result, received data is obtained.
- transmission data is encoded by encoding section 401, modulated by modulating section 402, and subjected to predetermined radio processing such as up-conversion in transmission radio processing section 403, and then transmitted as an uplink signal.
- predetermined radio processing such as up-conversion in transmission radio processing section 403, and then transmitted as an uplink signal.
- Transmission antenna selection section 404 selects either antenna 1 or antenna 2 as a transmission antenna for transmitting an uplink signal to base station 1.
- transmission antenna selection section 404 selects antenna 1 as a transmission antenna and transmits
- the uplink signal input from the transmission / reception processing unit 403 is input to the transmission / reception switching unit 101. Therefore, if IP I ⁇ IP I, the uplink processed wirelessly by transmission radio processing section 403
- the signal is transmitted from antenna 1 to base station 1. Conversely, I p
- transmission antenna selection section 404 selects antenna 2 as a transmission antenna, and inputs the uplink signal input from transmission radio processing section 403 to transmission / reception switching section 201. Therefore,
- p p
- transmission antenna selection section 404 uses the antenna with the worse propagation path condition for base station 2 in the adjacent cell as the transmission antenna for the uplink signal. Will choose. Therefore, the uplink signal transmitted from the antenna selected in this way is less likely to reach base station 2 of the P-contact cell, that is, the interference given to the P-contact cell is smaller. As described above, in the present embodiment, transmission antenna selecting section 404 selects one of antennas 1 and 2 that has less interference with adjacent cells as a transmission antenna for uplink signals.
- transmission antenna selection section 404 similarly sets the antenna having the lowest received power of the pilot signal transmitted from base station 2 among the plurality of antennas of the mobile station to the uplink to base station 1. Select as the signal transmission antenna. That is, transmission antenna selecting section 404 selects an antenna as a transmission antenna for an uplink signal when the interference given to the P-contact cell is the smallest among the plurality of antennas.
- the uplink signal is transmitted from the antenna having the worst channel state with the base station of the adjacent cell among the plurality of antennas of the mobile station.
- the applied interference can be reduced, and as a result, the communication system capacity can be increased.
- the antenna having the lowest received power of the pilot signal transmitted from base station 2 of the adjacent cell is selected as the transmission antenna of the uplink signal.
- the antenna that gives the least interference to the adjacent cell can be selected as the transmitting antenna.
- the propagation path condition with the base station 1 is not considered in the selection of the antenna, Depending on the state of the propagation path, the required reception quality of the uplink signal at base station 1 may not be satisfied.
- transmission power control is performed on uplink signals so that required reception quality of uplink signals at base station 1 is satisfied, and propagation between each antenna and base station 1 is performed.
- the transmitting antenna is selected in consideration of the road condition.
- FIG. 3 is a block diagram showing a configuration of a mobile station according to Embodiment 2 of the present invention.
- the same components as those in the first embodiment (FIG. 2) will be assigned the same reference numerals and description thereof will be omitted.
- received power measuring section 108 and power ratio calculating section 109 are provided corresponding to antenna 1. Pilot signal P extracted by pilot extraction section 105 is input to reception power measurement section 108. Received power measuring section 108 calculates the received power of pilot signal p.
- the ratio (P I / I P I) to P I is calculated, and the calculation result is transmitted to the transmission antenna selection unit 40.
- reception power measuring section 208 and power ratio calculating section 209 are provided corresponding to antenna 2. Pilot signal P extracted by pilot extracting section 205 is input to received power measuring section 208. Received power measurement section 208 calculates the received power of pilot signal p.
- the power ratio calculation section 209 receives the reception power I p I measured by the reception power measurement section 204.
- power ratio calculation section 109 calculates reception power I p
- Transmission antenna selection section 404 selects either antenna 1 or antenna 2 as a transmission antenna for transmitting an uplink signal to base station 1. Transmit antenna selection unit 404
- antenna 1 is selected as a transmission antenna, and the uplink signal input from transmission radio processing section 403 is input to transmission / reception switching section 101. Therefore, in the case of I p p
- the uplink signal wirelessly processed by wireless processing section 403 is transmitted from antenna 1 to base station 1. Conversely, if I P I / I p I ⁇ I p I / I p I, the transmitting antenna selector 4
- step 04 antenna 2 is selected as a transmission antenna, and the uplink signal input from transmission radio processing section 403 is input to transmission / reception switching section 201. Therefore, I p
- the uplink signal wirelessly processed by
- the antenna having a smaller ratio of the received power of the pilot signal transmitted from base station 2 to the received power of the pilot signal transmitted from base station 1 is used for the uplink signal to base station 1.
- Select as transmitting antenna. The selection result is input to transmission power control section 405. The reason for selecting in this way will be described later.
- transmission power control section 405 selects antenna 1 in transmission antenna selection section 404.
- the transmission power Pt of the uplink signal is determined according to the following equation (1) so that the required reception quality of the uplink signal at base station 1 can be satisfied.
- h is the propagation path attenuation between antenna 1 and base station 1
- I is the base station 1
- targetSIR is the target SIR at base station 1. Note that I and
- the targetSIR is reported from the base station 1 to the mobile station as control information. Also, the transmission power value of the pilot signal p at the base station is reported from the base station 1 to the mobile station as control information.
- the transmission power control unit 405 converts the notified transmission power value into the reception power I p
- transmission power control section 405 uses the following equation (2) to satisfy the required reception quality of the uplink signal at base station 1. , The transmission power Pt of the uplink signal is determined.
- ⁇ is the propagation path attenuation between the antenna 2 and the base station 1. Pilot signal ⁇
- the transmission power control unit 405 converts the notified transmission power value into the reception power I ⁇
- ⁇ can be obtained by dividing by 12 I.
- Transmission power control section 405 controls the transmission power of the uplink signal to be subjected to radio processing in transmission radio processing section 403 to the transmission power value calculated by the above equation (1) or (2).
- Such transmission power control is generally called open-loop transmission power control.
- the required transmission power Pt when transmitting an uplink signal from the antenna 2 is as shown in the above equation (2).
- transmission antenna selecting section 404 transmits the antenna of antenna 1 and antenna 2 that has less interference to the P-contact cell to the uplink signal. Is selected as the transmitting antenna. In other words, if It ⁇ It, antenna 1 is sent.
- antenna 2 is selected as the transmitting antenna.
- antenna 1 is used as the transmitting antenna.
- the transmission antenna selection unit 404 eventually determines that
- antenna 2 is selected as the transmitting antenna, as in the first embodiment, the antenna of antenna 1 and antenna 2 that has less interference with adjacent cells is used as the transmitting antenna of the uplink signal. Will be selected.
- the antenna that gives less interference to the base station 2 of the adjacent cell is selected.
- FIG. 4 shows the cumulative probability distribution (CDF) of the interference power in the base station 2 of the adjacent cell.
- CDF cumulative probability distribution
- the interference power can be reduced by 1 dB compared to the method of selecting antenna 2 at 12 I).
- transmission antenna selecting section 404 transmits base station 1 of the received power of the pilot signal transmitted from base station 2 among the plurality of antennas of the mobile station in the same manner as described above.
- the antenna having the smallest ratio of the pilot signal to the received power is selected as the transmitting antenna for the uplink signal to base station 1. That is, transmission antenna selection section 404 selects an antenna as a transmission antenna for an uplink signal when the interference with the P-contact cell is the smallest among the plurality of antennas.
- the transmission antenna for the uplink signal is selected based on the reception power ratio of the pilot signal as described above. It is possible to reduce the interference given to adjacent cells while satisfying the required reception quality at the base station receiving the uplink signal. As a result, even if the transmission power control is performed on the uplink signal, the capacity of the communication system can be reduced. Increase can be achieved.
- base station 1 and base station 2 have a plurality of antennas will be described.
- FIG. 5 is a configuration diagram of a mobile communication system according to Embodiment 3 of the present invention.
- This mobile communication system differs from the first embodiment in the following points. That is, each of base station 1 and base station 2 has two antennas, and base station 1 and base station 2 transmit downlink signals from both antennas 1 and 2 to the mobile station.
- r is
- ijk Indicates a downlink signal transmitted from antenna j of base station i and received by antenna k of mobile station.
- r is transmitted from antenna 2 of base station 1 and received by antenna 1 of mobile station.
- the base station has a plurality of antennas as described above, it is necessary to consider that the uplink signal is subjected to maximum ratio combining between antennas in the base station. That is, the above embodiment
- the received powers I p I and I p I at 1 are I p I 2 + I p) and I p, respectively. Replace as Where p is the pilot contained in the received signal r
- I p I is the received power of pilot signal p.
- FIG. 6 is a block diagram showing a configuration of a mobile station according to Embodiment 3 of the present invention.
- the same components as those in the first embodiment (FIG. 2) will be assigned the same reference numerals and description thereof will be omitted.
- configuration 10 in which adjacent cell pilot extracting section 103, received power measuring section 104, pilot extracting section 105, channel estimating section 106 and demodulating section 107 are combined has the same number as the number of antennas of the base station. Only N pieces are provided.
- configuration 20 combining adjacent cell pilot extraction section 203, received power measurement section 204, pilot extraction section 205, channel estimation section 206, and demodulation section 207 has only N antennas as many as the number of base station base stations. Be provided. Now, as shown in FIG. 5, base station 1 and base station 2 have two antennas, so N of mobile stations is two.
- N l adjacent cell pilot extracting section 103 outputs pilot signal p included in received signal r.
- N l received power measuring section 104 receives pilot signal p
- Pilot extracting section 103 outputs pilot signal p (that is, adjacent cell
- N 2 received power measuring section 104 receives pilot signal p
- Combining section 110 calculates combined received power I P for antenna 1 of the mobile station.
- N l adjacent cell pilot extracting section 203 outputs pilot signal included in received signal r.
- the signal p (that is, transmitted from antenna 1 of base station 2 in the
- the pilot signal p) is extracted, and the extracted pilot signal p is
- N l received power measuring section 204 receives pilot signal p.
- Pilot extraction section 203 outputs pilot signal p (that is,
- the received power measuring section 204 for N 2 calculates the received power of the pilot signal p.
- Combining section 210 calculates combined received power I p p for antenna 1 of the mobile station.
- Transmission antenna selection section 404 selects either antenna 1 or antenna 2 as a transmission antenna for transmitting an uplink signal to base station 1. Transmitting antenna selection selecting section 404, (I p I 2 + I p I 2) ⁇ f (I p I 2 + I p
- the uplink signal wirelessly processed by the transmission wireless processing unit 403 is an antenna
- transmission antenna selection section 404 selects antenna 2 as a transmission antenna, and inputs the uplink signal input from transmission radio processing section 403 to transmission / reception switching section 201. Therefore, (I p I 2 + I p I 2 ) ⁇ f ⁇ p
- the uplink signal wirelessly processed by transmission radio processing section 403 is transmitted from antenna 2 to base station 1.
- the antenna having the smaller combined reception power of the pilot signals transmitted from the plurality of antennas of base station 2 is selected as the antenna for transmitting the uplink signal to base station 1.
- the uplink signal transmitted from the antenna selected in this manner has less interference with adjacent cells as in the first embodiment.
- transmitting antenna selecting section 404 selects, of antennas 1 and 2, the antenna that gives less interference to adjacent cells as the transmitting antenna for uplink signals.
- I p I + I p I, f (I p I 2 + I p I 2 ) may be calculated as I p I + IPI.
- transmission antenna selection section 404 determines the antenna having the smallest combined reception power of the pilot signals transmitted from the plurality of antennas of base station 2 among the plurality of antennas of the mobile station in the same manner as described above. Select as the transmitting antenna for the uplink signal to station 1. That is, transmission antenna selection section 404 selects an antenna that gives the least interference to an adjacent cell from among a plurality of antennas as a transmission antenna for uplink signals.
- a base station has a plurality of antennas, and a base station has a plurality of antennas to select a transmission antenna based on a combined reception power of each antenna of a mobile station. Even when maximum ratio combining is performed between antennas at the base station, interference given to adjacent cells can be reduced, and as a result, communication system capacity can be increased.
- Embodiment 3 a case where base station 1 and base station 2 have a plurality of antennas and transmission power control is performed on uplink signals as in Embodiment 2 explain.
- the configuration of the mobile communication system according to the present embodiment is the same as that in FIG. Therefore, also in the present embodiment, it is necessary to consider that the uplink signal is subjected to maximum ratio combining between antennas in the base station. That is, the received power I p in the second embodiment is
- FIG. 7 is a block diagram showing a configuration of a mobile station according to Embodiment 4 of the present invention.
- the same components as those of the second embodiment (FIG. 3) or the third embodiment (FIG. 6) are denoted by the same reference numerals, and description thereof will be omitted.
- a configuration 30 combining an adjacent cell pilot extraction section 103, a reception power measurement section 104, a pilot extraction section 105, a channel estimation section 106, a demodulation section 107 and a reception power measurement section 108 is a base station.
- N antennas the same number as the number of antennas.
- the configuration 40 combining the adjacent cell pilot extraction unit 203, the reception power measurement unit 204, the pilot extraction unit 205, the channel estimation unit 206, the demodulation unit 207, and the reception power measurement unit 208 As many as the number of antennas of the base station are provided.
- the base station 1 and the base station 2 have two antennas, so N of the mobile station is two.
- N l pilot extraction section 105 outputs pilot signal p (that is,
- N l received power measuring section 108 measures received power I p I of pilot signal p
- pilot extraction section 105 for N 2 outputs pilot signal p (that is, base station 1) included in received signal r.
- N 2
- the transmission power measurement unit 108 measures the reception power I p I of the pilot signal p, and
- Combining section 111 obtains combined received power (I p I 2 + I p I 2 ) for antenna 1 of the mobile station, and calculates power ratio calculating section 1
- the power ratio calculation unit 109 calculates the combined reception power (I p I 2 + I p
- N l pilot extraction section 205 outputs pilot signal p included in received signal r.
- N l received power measuring section 208 measures received power I p I of pilot signal p.
- N 2 pilot extracting section 205 outputs pilot signal p (that is, base station
- N 2
- the received power measuring section 208 measures the received power I p I of the pilot signal p, and
- the power ratio calculation unit 109 calculates the combined reception power (I p + I p
- Transmission antenna selection section 404 selects either antenna 1 or antenna 2 as a transmission antenna for transmitting an uplink signal to base station 1.
- the transmitting antenna selection unit 404 has n I p
- transmission antenna selection section 404 selects antenna 2 as a transmission antenna, and inputs the uplink signal input from transmission radio processing section 403 to transmission / reception switching section 201. Therefore
- the signal is transmitted from antenna 2 to base station 1.
- the selection result is input to transmission power control section 405.
- transmission power control section 405 uses equation (7) below to satisfy the required reception quality of base station 1 for uplink signals. Then, the transmission power Pt of the uplink signal is determined. Here, it is considered that the uplink signal is combined between two antennas in base station 1.
- h is the propagation path attenuation between antenna 1 of the mobile station and antenna 1 of the base station 1.
- I is the amount of interference received by base station 1 and targetSIR is the target SIR at base station 1.
- I and targetSIR are reported from the base station 1 to the mobile station as control information.
- the transmission power values of the pilot signals p and p at the base station are also used as control information.
- the transmission power control unit 405 Since the mobile station is notified from the base station 1, the transmission power control unit 405 obtains ⁇ and ⁇ ⁇ ⁇ by dividing the notified transmission power value by the received power p or p.
- transmission power control section 405 uses the following equation (8) to satisfy the required reception quality of the uplink signal at base station 1. , The transmission power Pt of the uplink signal is determined.
- the uplink signal is
- Station 1 considers that the antennas are combined between the two antennas.
- h is the propagation path attenuation between antenna 2 of the mobile station and antenna 1 of the base station 1.
- the transmission power values of the pilot signals p and p at the base station are also used as control information by the base station.
- transmission power control section 405 determines ⁇ and ⁇ by dividing the notified transmission power value by reception power P or p.
- the number of antennas included in the mobile station is two for convenience of description, but may be three or more.
- transmission antenna selection section 404 similarly transmits the antenna having the smallest ratio of the combined reception power of the pilot signal among the plurality of antennas of the mobile station to the transmission antenna of the uplink signal to base station 1. Select as. That is, transmission antenna selection section 404 selects an antenna as a transmission antenna for an uplink signal when interference given to an adjacent cell is the smallest among a plurality of antennas.
- the transmitting antenna is selected based on the ratio of the combined received power at each antenna of the mobile station, even if the base station has multiple antennas and the uplink signal is maximally ratio-combined between the antennas at the base station.
- the capacity can be increased.
- a mobile station performs adaptive modulation and coding.
- FIG. 8 is a block diagram showing a configuration of a mobile station according to Embodiment 5 of the present invention.
- the same components as those in Embodiment 1 (FIG. 2) or Embodiment 2 (FIG. 3) are denoted by the same reference numerals, and description thereof will be omitted.
- 11 I is input to the MCS determination unit 112. Also, the received power I p measured by the received power measurement unit 208
- MCS determining section 112 determines an uplink signal from antenna 1 based on received power I p
- I p received power
- the MCS determination unit 212 determines the received power I p
- the determination of the MCS level is performed as follows.
- FIG. 9 is a table showing the correspondence between the MCS level and the received power.
- a plurality of modulation and coding schemes indicated by a plurality of MCS levels are prepared in advance in the tape recorder according to the received power.
- the MCS determination units 112 and 212 determine the usable MCS level for each antenna with reference to this table.
- the mobile station determines the MCS by using the power TDD method that uses the SNR level at the base station because the propagation path of the uplink signal and the downlink signal are the same and the propagation path characteristics are almost the same.
- the received power at the mobile station IPP the received power at the mobile station IPP
- QPSK QPSK
- pI power lOOdBm or more and less than _96dBm, MCS level 2 (modulation method: QPSK
- the determination by the MCS determining unit 212 is also performed in the same manner as the MCS determining unit 112 based on the received power I p I.
- the result of the determination and the result of the determination by the MCS determining unit 212 are both input to the MCS comparing unit 406.
- MCS comparing section 406 is configured to determine the MCS level (MCS level usable in antenna 1) determined by MCS determining section 112 and the MCS level determined by MCS determining section 212 (MCS level usable in antenna 2). ) And compare. That is, the MCS levels are compared between the antennas.
- MCS comparing section 406 sets a higher MCS level to obtain the maximum throughput. At the same time, it instructs transmission antenna selection section 404 to select an antenna having a higher MCS level. For example, MCS comparing section 406 inputs “1” to transmitting antenna selecting section 404 when instructing to select antenna 1 and “2” when instructing to select antenna 2. According to this instruction, transmission antenna selection section 404 selects an antenna having a higher MCS level among antennas 1 and 2 as a transmission antenna for uplink signals. Further, MCS comparing section 406 sends the selected MCS level to encoding section 401 and modulating section 402. Encoding section 401 and modulation section 402 perform encoding and modulation at an encoding rate and modulation scheme corresponding to the MCS level sent from MCS comparison section 406.
- the MCS comparing section 406 determines that the transmission antenna selection section 404 has no interference with adjacent cells. Instructs to select the smaller antenna as the transmitting antenna for uplink signals. For example, MCS comparing section 406 inputs “0” to transmitting antenna selecting section 404 when the MCS levels are the same. In accordance with this instruction, transmission antenna selection section 404 selects the antenna of antenna 1 and antenna 2 that has less interference with adjacent cells as the transmission antenna for uplink signals.
- the transmission antenna selection method in this case is as described in the first embodiment.
- MCS comparing section 406 sends the MCS level to encoding section 401 and modulation section 402.
- the coding section 401 and the modulation section 402 perform coding and modulation at the coding rate and modulation scheme corresponding to the MCS level sent from the MCS comparison section 406.
- FIG. 10 is a flowchart showing an operation of the mobile station according to Embodiment 5 of the present invention.
- the MCS level L is measured according to the received power I p I, and the received power is measured.
- the MCS level L is determined according to the force I p I, and in ST30, the MCS level L and the MCS level are determined.
- the antenna with the higher bell is selected as the transmitting antenna.
- the antenna with the highest MCS level is selected as the transmitting antenna, while the plurality of antennas are selected. If the available modulation and coding schemes are the same, the antenna that gives the least interference to the neighboring cells is selected, so that the interference given to the neighboring cells can be reduced without reducing the throughput. As a result, the communication system capacity can be increased.
- the antenna with the best propagation path condition with base station 1 is selected as the transmitting antenna, and the mobile station is located near the cell boundary. If the antenna is located at a position, the antenna that gives the least interference to neighboring cells is selected as the transmitting antenna.
- FIG. 11 is a block diagram showing a configuration of a mobile station according to Embodiment 6 of the present invention.
- the same components as those of the first embodiment (FIG. 2) or the second embodiment (FIG. 3) are denoted by the same reference numerals, and description thereof will be omitted.
- the received power I p I measured in step 2 is transmitted to the averaging section 407 and the transmitting antenna selecting section 404.
- Averaging section 407 calculates an average value of received power I p.
- the average value of the long section of the average value is obtained. That is, the long-term average of the received power of the pilot signal is obtained.
- the obtained long section average is input to transmission antenna selection section 404. Since p and p are both pilot signals transmitted from the base station 1,
- transmission antenna selection section 404 compares the long-term average of the received power with the threshold. If the long-term average of the received power is equal to or greater than the threshold value (that is, if the distance between base station 1 and the mobile station is less than the threshold value), the mobile station moves to the center of the cell of base station 1 Judgment is made that the nearby cell has little interference to adjacent cells, and the antenna with better propagation path condition between base station 1 and antenna 1 and antenna 2 is selected as the transmission antenna for uplink signal . Specifically, transmission antenna selection section 404 determines that I p
- transmission antenna selecting section 404 sets the Bureau based Judging that the interference given to the neighboring cell is large near the cell boundary of the base station 1, the antenna that gives less interference to the base station 2 of the neighboring cell is used as the antenna for transmitting the uplink signal. Select as The specific selection method is as described in the first embodiment.
- the threshold value used in transmitting antenna selecting section 404 is notified from base station 1 as a part of the received data, and is input to transmitting antenna selecting section 404.
- the base station 1 considers, for example, the amount of allowable interference with the P-connected cell and the number of mobile stations contained in the adjacent cell. Specifically, the base station increases the threshold of the received power as the amount of allowable interference with the P-contact cell is smaller, and increases the received power as the number of mobile stations accommodated in adjacent cells increases. Increase the threshold.
- FIG. 12 is a block diagram showing another configuration of the mobile station according to Embodiment 6 of the present invention.
- the same components as those in Embodiment 1 (FIG. 2) or Embodiment 2 (FIG. 3) are denoted by the same reference numerals, and description thereof will be omitted.
- the operation of averaging section 407 in FIG. 12 is the same as that in FIG.
- Transmission antenna selecting section 404 in FIG. 12 determines that if the long-term average of the received power is equal to or greater than the threshold (that is, if the distance between base station 1 and the mobile station is less than the threshold), Then, of antenna 1 and antenna 2, the one having a better propagation path condition with base station 1 is selected as the transmission antenna for the uplink signal. Specifically, transmitting antenna selecting section 404 selects antenna 1 when I p I ⁇ I p I,
- transmission antenna selecting section 404 sets the antenna Among the antennas 1 and 2, the antenna that gives less interference to the base station 2 in the adjacent cell is selected as the uplink signal transmission antenna.
- the specific selection method is as described in the second embodiment.
- the method of selecting an antenna is changed according to the distance between a mobile station and a base station, it is determined that interference given to P-contact cells is determined to be large. Bureau The mobile station, which determines that the interference given to the neighboring cell is the smallest and selects the antenna as the transmitting antenna, and the mobile station determined to have the smallest interference given to the neighboring cell, can select the antenna with the best propagation path condition as the transmitting antenna. Efficient antenna selection diversity can be performed for the entire system.
- a mobile communication system including two base stations, base station 1 and base station 2 has been described as an example.
- a mobile communication system including three or more base stations has been described.
- the present invention can be similarly applied to When three or more base stations are included, one of the base stations in another cell is selected as a base station to be subjected to interference reduction, and the base station is regarded as base station 2 in the above embodiment, and the same as above. May be performed.
- a method of selecting a base station for example, (1) a method of selecting a base station that gives the greatest interference to the mobile station, that is, a method of selecting the base station with the highest received power of the mobile station in the TDD system, and (2) receiving A method of selecting a base station with the largest interference, a method of (3) selecting a base station with the largest accommodation ratio (the number of accommodated users / the maximum number of accommodable users), and the like can be considered.
- the communicating base station base station 1 receives information on the interference status and the accommodation ratio from the adjacent base station, and selects a base station to be subjected to interference reduction based on the information. Further, the communicating base station notifies the mobile station of the selected interference reduction target base station.
- Each functional block used in the description of each of the above embodiments is typically implemented as an LSI that is an integrated circuit. These may be individually formed into one chip, or may be formed into one chip so as to include some or all of them.
- an LSI depending on the difference in the degree of power integration as an LSI, it may also be referred to as an IC, a system LSI, a super LSI, or a peripheral LSI.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. After the LSI is manufactured, an FPGA (Field Programmable Gate Array) that can be programmed and a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- FPGA Field Programmable Gate Array
- the present invention is suitable for a radio communication mobile station device and the like used in a mobile communication system.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05710496A EP1715600A1 (en) | 2004-02-26 | 2005-02-22 | Mobile station device and transmission antenna selection method in the mobile station device |
JP2006510415A JPWO2005083907A1 (ja) | 2004-02-26 | 2005-02-22 | 移動局装置および移動局装置における送信アンテナ選択方法 |
BRPI0508234-0A BRPI0508234A (pt) | 2004-02-26 | 2005-02-22 | dispositivo de estação móvel e método de seleção de antena de transmissão no dispositivo de estação móvel |
US10/590,482 US20070173208A1 (en) | 2004-02-26 | 2005-02-22 | Mobile station device and transmission antenna selection method in the mobile station device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004051587 | 2004-02-26 | ||
JP2004-051587 | 2004-02-26 |
Publications (1)
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WO2005083907A1 true WO2005083907A1 (ja) | 2005-09-09 |
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PCT/JP2005/002765 WO2005083907A1 (ja) | 2004-02-26 | 2005-02-22 | 移動局装置および移動局装置における送信アンテナ選択方法 |
Country Status (8)
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US (1) | US20070173208A1 (ja) |
EP (1) | EP1715600A1 (ja) |
JP (1) | JPWO2005083907A1 (ja) |
KR (1) | KR20060132918A (ja) |
CN (1) | CN1926785A (ja) |
BR (1) | BRPI0508234A (ja) |
RU (1) | RU2006130751A (ja) |
WO (1) | WO2005083907A1 (ja) |
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Also Published As
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RU2006130751A (ru) | 2008-02-27 |
BRPI0508234A (pt) | 2007-07-17 |
JPWO2005083907A1 (ja) | 2007-11-29 |
EP1715600A1 (en) | 2006-10-25 |
US20070173208A1 (en) | 2007-07-26 |
CN1926785A (zh) | 2007-03-07 |
KR20060132918A (ko) | 2006-12-22 |
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