WO2007113923A1 - 無線通信システム、無線基地局装置及び無線端末装置 - Google Patents
無線通信システム、無線基地局装置及び無線端末装置 Download PDFInfo
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- WO2007113923A1 WO2007113923A1 PCT/JP2006/307793 JP2006307793W WO2007113923A1 WO 2007113923 A1 WO2007113923 A1 WO 2007113923A1 JP 2006307793 W JP2006307793 W JP 2006307793W WO 2007113923 A1 WO2007113923 A1 WO 2007113923A1
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- directional beam
- unit
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- prediction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
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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
- H04B7/0613—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 simultaneous transmission
- H04B7/0615—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 simultaneous transmission of weighted versions of same signal
- H04B7/0617—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 simultaneous transmission of weighted versions of same signal for beam forming
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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
- H04B7/0697—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 spatial multiplexing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
Definitions
- Wireless communication system wireless base station device, and wireless terminal device
- the present invention relates to a technology for improving frequency utilization efficiency by adaptive modulation communication based on feedback of downlink communication quality in a base station apparatus equipped with smart antenna technology.
- wireless base station devices of wireless communication systems such as mobile phones and wireless LANs.
- the operating principle of smart antenna technology is disclosed, for example, in B. Widrow, et al .: Adaptive Antenna Systems, Proc. IEEE, vol. 55, No. 12, pp. 2143-2159, Dec. 1967.
- a wireless base station apparatus in which a plurality of terminals share the same time and frequency and perform spatial multiplexing communication by smart antenna technology is disclosed in, for example, Japanese Patent No. 3 1 6 7 6 8 2.
- cdma2000 EV- is a packet transmission method for IMT 1 200, which aims to increase the peak downstream transmission rate and increase throughput.
- DO (Evolution Data Only) method has been standardized (for example, 3GPP2 C. S0024-A “cdma2000 High Rate Packet Data Air Interface Specification” 1 3-4 4 force 1 3-7 page 8 2 0 0 March 3, 1 year 4).
- bucket scheduling is performed in order to efficiently use a limited frequency and time.
- a wireless base station device is a wireless data terminal device that is a downlink data transmission destination for each time slot of 1.6 milliseconds. It is a technology to select.
- a wireless communication device having high priority data or a wireless communication device with high downlink communication quality is given priority.
- downlink refers to the direction of radio communication transmitted by the radio base station apparatus and received by the radio terminal apparatus.
- the (3) Proportional Fairness method uses the instantaneous downlink communication quality and the average downlink communication quality as an evaluation value, and a radio terminal device with a higher evaluation value is preferentially assigned a transmission opportunity. For this reason, in the Proportional Fairness method, communication opportunities are equal and the frequency utilization efficiency is superior to the Round Robin method. However, it is necessary for the radio base station apparatus to correctly know the instantaneous downlink communication quality for each radio terminal apparatus.
- the radio terminal equipment estimates the downlink communication quality (SINR: Signal to Interference plus Noise Ratio) from the received pilot signal, and the modulation scheme and coding rate (SINR) allow communication with a packet error of 1% or less.
- SINR Signal to Interference plus Noise Ratio
- SINR modulation scheme and coding rate
- An index (DRC: Data Rate Control) corresponding to is fed back to the radio base station equipment. This mechanism allows the wireless base station device to know the instantaneous downlink communication quality for each wireless terminal device.
- a wireless communication network composed of wireless base station devices (hereinafter referred to as smart antenna base stations) equipped with smart antenna technology
- CQI downlink communication quality information
- a wireless base station device and a wireless terminal device that perform packet scheduling based on the above.
- the frequency utilization efficiency of the cell depends on the error of CQI. Decreases. For example, if the wireless terminal device estimates the downlink communication quality to be higher than the actual one, the wireless base station device adopts an advanced modulation scheme and a high coding rate, but the frequency usage increases because the frequency of occurrence of bucket errors increases. Efficiency decreases.
- the wireless terminal device estimates the downlink communication quality to be lower than the actual one, the wireless base station device adopts a simple modulation scheme and a low coding rate, and the frequency of packet errors decreases.
- the wireless base station device and the wireless terminal device perform low-efficiency communication in a state where high-efficiency communication is possible, the frequency utilization efficiency decreases as a result.
- accurate CQI estimation in radio terminal equipment is an important issue. Smart antenna base stations are more susceptible to CQI errors than radio base station devices with sector antennas. This will be described below.
- FIG. 1 shows the sequence diagram between the radio base station equipment and radio terminal equipment in the EV-DO system. However, the round trip delay is ignored for simplicity.
- the radio base station apparatus Base Station
- the radio terminal apparatus Mobile Station
- Data is sent to a specific wireless terminal device.
- the destination is determined by the packet scheduler executed one slot before.
- the pilot is used for both detection of the received signal and estimation of the received SINR in the wireless terminal device.
- step S 1 0 1 the radio terminal apparatus that has received the pilot measures S I N R to select an appropriate M C S, and feeds back an index (D R C) corresponding to M C S to the radio base station apparatus.
- the information fed back to the radio base station apparatus is generally called CQI.
- DRC is equivalent to CQI, but other control signals may be used as long as they represent the instantaneous downlink communication quality that is essentially the selection criterion of the wireless terminal device by the packet scheduler.
- the estimated SINR itself may be used.
- the radio base station apparatus that has received the CQI feed pack performs packet scheduling in step S 1 0 2 and selects a radio terminal apparatus as a data transmission destination in slot N. The above operation is repeated for each slot.
- the packet scheduler Since the smart antenna base station can perform spatial multiplexing communication by controlling the direction of directing the beam with the maximum intensity and the null, the packet scheduler simultaneously sets multiple wireless terminal devices as data transmission destinations for each slot. Since the shape of the directional beam changes depending on the combination of multiple selected wireless terminal devices, the shape of the directional beam output from the wireless base station device is considered to change from slot to slot. This is the decisive difference from the sector antenna base station.
- the pilot and data directional beams transmitted in slot N are
- the SI NR estimated by the pilot in slot N-1 is not accurate in slot N because it is different from what is transmitted in slot N-1. It is an object of the present invention to prevent a decrease in frequency use efficiency due to this SINR estimation error.
- Japanese Patent Application Laid-Open No. 2004-165834 solves this problem in a limited manner.
- a radio base station apparatus transmits a pilot by a directional beam
- a radio terminal apparatus determines downlink communication quality from a received pilot, and feeds back to the radio base station apparatus.
- this technology does not guarantee that the switching timing of directional beam patterns is synchronized between radio base station devices.
- the radio base station apparatus hereinafter referred to as the desired base station
- the interference base station the radio base station apparatus with which the radio terminal apparatus is communicating.
- the directional beam shapes output by the call are not always the same, the inter-cell interference power cannot be estimated correctly.
- the effect of this problem appears remarkably at the cell edge where the dominant ratio of inter-cell interference in downlink reception quality is high, causing a decrease in frequency utilization efficiency of the radio terminal equipment existing in the cell edge.
- Japanese Patent Application Laid-Open No. 2003-304577 this problem is solved with the assumption of a switched beam.
- a pilot is simultaneously transmitted using an omnidirectional beam provided by a radio base station apparatus, and a radio terminal apparatus receives each received pilot regardless of a desired base station or an interfering base station.
- the power is estimated and fed back to the desired base station.
- the desired base station receives a notification of the beam number used for data transmission from the interfering base station, and compares it with the feedback information from the wireless terminal device.
- a technique for predicting the above is disclosed.
- the radio base station equipment receives the received power feedback of each individual pilot and the notification of the beam number from the interfering base station. The problem is solved. However, the processing for removing these uncertainties places a load on the wireless terminal device and the wireless base station device.
- the problems to be solved by the present invention are summarized in consideration of the above that cannot be applied if the directional beam shapes are different when transmitting simultaneously with the pilot and when transmitting data.
- the problem that the interference power after scheduling is uncertain at the time of SINR estimation at the wireless terminal equipment is the prediction for predicting the downlink communication quality after spatial signal processing after the time unified between the wireless base station equipment
- a radio base station apparatus that transmits a pie-up packet in advance, and receives the prediction pilot, measures downlink communication quality, and reports the downlink communication quality to the radio base station apparatus via an uplink.
- the prediction pilot is transmitted between the radio base station devices at the same time and frequency, and is transmitted using the same directional beam as the directional beam used for data transmission after the unified time.
- Figure 2B shows the output of the radio base station equipment at slot N + M.
- 2 0 0 1— 1 and 2 0 0 1—2 are powered by adjacent radio base station devices. Indicates the cell to be barred.
- the detection pilot and data are output, and in the directional beam 2 0 3, the prediction pilot is output.
- Data is adaptively modulated in the directional beam 200 2, but in order to take advantage of this, it is necessary to correctly estimate the downlink communication quality in consideration of the directional beam output at slot N + M. However, if estimation is performed using different directional beam outputs, the causality cannot be satisfied and correct estimation cannot be performed.
- the directional beam output of slot M + N is determined, and a prediction pilot is output in the beam 2 0 0 2,
- the wireless terminal device estimates the downlink communication quality and feeds it back to the wireless base station device.
- This solves the problem because the channel quality of slot M + N can be predicted at the time of slot N.
- the signal of the directional beam 2 0 0 2 and the signal of the directional beam 2 0 0 3 in Fig. 2B are multiplexed in the slot so that they do not interfere with each other (for example, time Multiplexing, frequency multiplexing) is desirable.
- each radio base station device synchronizes with each other and transmits the prediction pit for slot M with a directional beam that matches the directional beam for data transmission at slot M + N. This is because prediction in consideration of inter-cell interference in can be performed.
- FIG. 3A shows a conceptual diagram in which a pilot pilot is transmitted from the radio base station apparatuses 11 and 12 to the radio terminal apparatus 13. Let each propagation time be T1 and T2.
- Fig. 3B shows the reception timing at the terminal device when these prediction payloads are transmitted simultaneously between radio base station devices at time T0.
- the reception time of each prediction pilot is TO + T l, T 0 + T 2
- the prediction pipeline between radio base station devices does not overlap, so inter-cell interference is caused by the prediction pilot. Cannot be estimated correctly.
- This problem is solved by synchronizing the radio base station apparatuses and taking a sufficiently long propagation delay time difference that may occur between radio base station apparatuses that may interfere with the length of the pilot for prediction. .
- Fig. 3C shows an example of a pie arrangement in a slot expanded in the frequency direction.
- the pilot for prediction ⁇ ⁇ 1 0 3 needs to absorb the deviation of the reception timing between cells, so it is not necessary to detect it. A long time is allocated.
- the prediction pilot and the detection pilot are frequency-multiplexed.
- the data signal is transmitted in the remainder of the slot with the same frequency as the detection pilot.
- the present invention since downlink communication quality including inter-cell interference is correctly estimated, adaptive modulation of downlink communication operates with high accuracy and frequency use efficiency is improved. In particular, since the inter-cell interference power can be correctly estimated, the frequency utilization efficiency of the radio terminal device existing at the cell edge is improved.
- the downlink communication quality can be correctly estimated for any directional beam pattern generated by the smart antenna technology. Therefore, frequency utilization efficiency is improved by the synergistic effect of each other in order to make the best use of the advantages of spatial multiplexing with smart antenna technology and the advantages of high-accuracy adaptive modulation based on correct communication quality estimation.
- FIG. 1 is a processing sequence diagram between a wireless base station device and a wireless terminal device in the EV-DO system.
- Figures 2A and 2B are conceptual diagrams of directional beam control.
- 3A to 3C are diagrams showing the necessity of extending the inter-base station synchronization and prediction pilots.
- FIG. 4 is a block diagram of the radio base station apparatus according to the embodiment of the present invention.
- FIG. 5 is an explanatory diagram of a slot format according to the embodiment of the present invention.
- FIG. 6A and FIG. 6B are explanatory diagrams of control on a time series of directional beams according to the embodiment of the present invention.
- 7A to 7C are explanatory diagrams of data stored in various buffers according to the embodiment of the present invention.
- FIG. 8 is a block diagram of a configuration for determining a directional beam according to the first embodiment.
- FIG. 9 shows a modification of the block diagram of the configuration for determining the directional beam of the second embodiment.
- FIG. 10 is a block diagram of the wireless terminal device according to the embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 4 is a block diagram showing the configuration of the radio base station apparatus according to the embodiment of the present invention.
- a queue buffer (Queue Buffer) in which data waiting to be transmitted to the wireless terminal device is stored, and a feedback information buffer in which feedback information about downlink channel information (CQI) transmitted from the wireless terminal device is recorded.
- CQI downlink channel information
- (Feedback Buffer) 1 0 0 1 b
- the terminal direction buffer DOA (Direction of Arrival) Buffer) 1 0 0 1 c in which the direction of the wireless terminal device viewed from the wireless base station device is recorded Realized by 0 0 1.
- Figure 7 shows an example of data storage in each buffer.
- Figure 7A shows an example queue buffer.
- the first column is the terminal identification number MS—ID.
- the second column shows the priority (Priority). The higher the priority, the easier it is for the packet scheduler 1 0 0 2 to select the terminal.
- the third column shows the data transmission interval (Interval) in slot units. It is assumed to be used in QoS control. When the packet scheduler operates for 1 slot, 1 is uniformly added to all rows, and the terminal selected as the data transmission destination terminal is reset to 0.
- the fourth column (Bit Length) is the number of untransmitted bits remaining in the queue buffer.
- the fifth column (Bit Stream) is the actual untransmitted bit sequence.
- Figure 7B shows an example of the feedback information buffer.
- the first column is the terminal identification number
- the second column is the beam identification number Beam—ID
- the third column is the feedback information (CQI). If the feedback information is Invalid id, it indicates that there is no feedback information, and the packet scheduler prevents the terminal from being assigned to the beam.
- Figure 7C shows an example of a terminal orientation buffer.
- the first column is the terminal identification number
- the second column is the orientation of the wireless terminal device viewed from the wireless base station device.
- the azimuth is expressed as an angle based on a predetermined direction (for example, east).
- the packet scheduler 1 0 0 2 performs a queue buffer (Fig. 7 A) and a feedback information buffer (Fig. 7 B) in the memory 1 0 0 1 periodically (hereinafter, a fixed time determined as a time slot). If necessary, the terminal terminal buffer (FIG. 7C) is referred to, and the data transmission destination wireless terminal apparatus for each transmission directional beam is determined. After the transmission destination is determined, the packet scheduler 1 0 0 2 can transmit to the data symbol sequence generator 1 0 0 3 a beam identification number, a terminal identification number, a modulation method, a coding rate, and a transmission rate for each transmission directional beam. Notify the maximum number of bits (equivalent to the MAC payload in the physical bucket).
- Data symbol sequence generator (Forward Link Data Generator) 1 0 0 3 reads the bit sequence for each terminal identification number from the queue buffer 1 0 0 1 a based on the notification information described above, and uses the specified coding rate. Depending on the encoding and the specified modulation method To generate a data symbol sequence.
- the generated data symbol sequence is
- a detection pilot generator 1004 adds a quadrature code to a known symbol sequence in the wireless terminal device, generates a detection pilot with a different orthogonal code for each beam identification number, Send to one multiplexing section 1005.
- First multiplexing section 1 005 time-multiplexes the data symbol sequence sent from data symbol series generation section 1003 and the detection pilot sent from detection pilot generation section 1004 with the same beam identification number.
- the output is transmitted to the first beamform unit (Beam Former) 1 006 in association with the beam identification number.
- Beam Former Beam Former
- FIG. 5 shows an example of time multiplexed signals.
- D P 10 1 indicates a detection pilot
- D ATA 1 02 indicates a data symbol sequence.
- P P 103 is a prediction pilot multiplexed by the second multiplexing unit.
- the second multiplexing unit 10 1 2 will be described later.
- CP 104 is a common bypass signal
- COMMON-DAT A 105 is a common control signal.
- DP 1 01, DAT A 1 02 and PP 1 03 are time-multiplexed with each other and then spatially multiplexed with signals transmitted with other directional beams.
- CP 1 04 and C OMMON DATA 1 05 are Sent simultaneously with omni directivity.
- time multiplexing is adopted as a method for multiplexing each pilot signal and data signal. If the radio signal on the receiving side can restore the transmission signal, code multiplexing or frequency multiplexing may be used. .
- the first beamform unit 1006 distributes and outputs the output of the first multiplexing unit 1005 to each transmitting antenna for each time slot, and the directional beam provided by the detection directional beam determination unit 1007. Amplitude phase control equivalent to is performed for each antenna element. The above control is performed for each beam identification number, and is processed sequentially for each beam identification number by time division, or a plurality of first beamform units 1006 are provided, There is an option of parallel processing for each beam identification number. However, there is no difference in the effect of the present invention by either method. The processing results for all beam identification numbers are added for each antenna element and sent to the second multiplexing section 1 0 1 2.
- the detection beam generator (Detection Beam Generator) 1 0 0 7 stores the amplitude phase control amount corresponding to the detection directional beam for each beam identification number in the first beamform unit 1 0 0 6 for each time slot.
- the amplitude and phase control amount corresponding to a new directional beam for each beam identification number is read out from the directional beam buffer (Beam Buffer) 1 0 0 8.
- the directional beam buffer 10 08 is a FIFO buffer, and the amplitude and phase control amount corresponding to the oldest directional beam is read by the detection directional beam determination unit 10 0 7 for each time slot.
- a prediction directional beam determination unit (Estimation Beam Generator) 1 0 0 9 writes the amplitude phase control amount corresponding to the latest directional beam.
- the capacity of the directional beam buffer 10 08 is assumed to be the M slots of the radio base station equipment shown in Fig. 2. This absorbs the round trip delay related to feedback from the wireless terminal device.
- the prediction beam generator (Estimation Beam Generator) 1 0 0 9 determines the prediction directional beam for each beam identification number for each time slot, and the amplitude phase corresponding to the determined prediction directional beam
- the control amount is associated with the beam identification number and written to the predictive directional beam buffer 100 8, and the predictive directional beam is notified to the second beam form unit 110 1 1. Details of this processing will be described later.
- Prediction pilot generator (Estimation Pilot Generator) 1 0 10 0 adds a quadrature code to a known symbol sequence in a radio terminal device, and generates a pilot for prediction of different orthogonal codes for each beam identification number And sent to the second multiplexing unit 1 0 1 1.
- the second beamform unit 1 0 1 1 distributes and outputs the output of the prediction pie-tut generation unit 1 0 1 0 to each transmitting antenna for each time slot, and the prediction directivity beam determination unit Amplitude phase control corresponding to the directional beam provided by 1 0 0 9 Repeat for each antenna element.
- the above control is performed for each beam identification number.
- the processing results for all beam identification numbers are added for each antenna element and sent to the second multiplexing section 1 0 1 2.
- the second multiplexing section 1 0 1 2 time-multiplexes the output of the first beamform section 1 0 0 6 and the output of the second beamform section 1 0 1 1 for each antenna element, and the front end for each time slot. Send to part 1 0 1 3
- FIG. 5 shows an example of time multiplexed signals.
- D P 1 0 1 is a detection pilot
- D A T A 1 0 2 is a data symbol sequence
- P P 1 0 3 is a prediction pie.
- the effect of the present invention does not change depending on the time arrangement of pilots and data.
- code multiplexing may be used if the detection pie and data do not cause mutual interference with the prediction pie.
- the front end section 1 0 1 3 converts the base panda signal and the RF signal for each antenna element (1 0 1 4—1, 2, 3 and 1 0 2 0).
- the front end section 10 1 3 includes a digital analog converter (DAC), an analog digital converter (ADC), a filter, an amplifier, and a frequency oscillator.
- DAC digital analog converter
- ADC analog digital converter
- Japanese Patent Application Laid-Open No. 2 0 0 4-1 0 4 0 4 0 discloses a configuration example of a front end portion.
- a received signal processor (Received Signal Processor) 1 0 1 5 separates an uplink signal received from a wireless terminal device for each wireless terminal device.
- the uplink signal is a CDMA signal
- the signal can be separated for each wireless terminal device by despreading with a spreading code unique to the wireless terminal device.
- the reverse link data restoration unit (Reverse Link Data Restoration Unit) 1 0 1 6 demodulates and decodes the uplink signal for each wireless terminal device output by the reception signal processing unit 1 0 1 5 and transmits it by the wireless terminal device Generate a data bit sequence.
- the signal divider (Divider) 1 0 17 extracts CQI feedback information from the transmission data bit sequence for each wireless terminal device, which is the output of the transmission signal restoration unit 1 0 1 6, and outputs a feedback information buffer 1 0 0 1 Write to b.
- the terminal direction estimation unit (DOA Estimator) 1 0 1 8 receives an uplink signal converted into a baseband signal by the front end unit 1 0 1 3.
- the MU SIC method is known, which calculates the pilot signal correlation matrix for each wireless terminal device and estimates the arrival direction of the uplink signal based on the eigenvalue analysis. The result of estimating the direction of arrival for each wireless terminal device is written in the terminal orientation buffer 1 0 0 1 c in association with the terminal identification number.
- the terminal azimuth buffer 1 0 0 1 c is referred to when the prediction directional beam determination unit 1 0 0 9 determines a directional beam, which will be described later in detail.
- the packet scheduler 1 0 0 2, the first beamform unit 1 0 0 6, the detection directional beam determination unit 1 0 0 7, the prediction directional beam determination unit 1 0 0 9, the second beam It is desirable that the foam unit 1 0 1 1 and the second multiplexing unit 1 0 1 2 operate for each time slot.
- the time between the base stations is synchronized by the GPS signal as in the EV-DO system.
- the beam identification number and the terminal identification number are acquired from the packet scheduler.1 0 0 2 and beam allocation control information indicating which radio terminal apparatus is allocated to which directional beam is generated.
- the beam allocation control information is rearranged, encoded, and modulated according to a protocol defined with the wireless communication terminal.
- the common signal generation unit 10 19 generates a common pilot signal for use by all wireless terminal devices in the cell for synchronization and detection of the common control signal. Since the common pilot signal is transmitted simultaneously with the prediction pilot and the detection pilot, different orthogonal codes are integrated.
- the beam allocation control information and the common pilot signal are time-multiplexed and transmitted simultaneously with other signals transmitted by a directional beam.
- the control data restoration unit 3 0 5 decodes the beam allocation control information, determines whether or not there is data transmission to the own station, and determines whether or not to decode the data.
- the digital signal processing excluding the front end and the antenna is And DS P FPGA (Field Programmable Gate Array).
- 6A and 6B are diagrams for explaining the directional beam control according to the present invention on the time axis. Since the common control signal transmitted with omni directivity is always output, it is omitted in the following description.
- the directional beam determining unit 100 9 for prediction uses a directional beam (B PG # 1 (BPG is an abbreviation of Beam Pattern Group) to be applied to the pilot for prediction. )) Is generated.
- BPG # 1 BPG is an abbreviation of Beam Pattern Group
- the radio base station apparatus outputs nothing, nothing is output to the cell 2001 as shown in the first slot of FIG. 6B.
- the second slot writes the directional beam for prediction (BPG # 1) generated in the first slot into the directional beam buffer 1008 (FIG. 6A broken line).
- the second beamform section 1 0 1 amplitude phase control (solid line in FIG. 6A) corresponding to the prediction directional beam (B PG # 1) is performed on the prediction pilot.
- the predictive directional beam determining unit 1 009 generates the next predictive directional beam (B PG # 2).
- B PG # 2 the description after B PG # 2 is omitted.
- the pilot for prediction in which the directional beam is processed in the second beam form part 10 1 1 of the second slot is connected to the second multiplexing part 10 1 2 as indicated by a solid line in FIG. 6A.
- the amplitude phase control amount of the directional beam stored in the directional beam buffer 1008 is read out to the detection directional beam determination unit 1007 as indicated by a broken line in FIG. 6A.
- nothing is output to cell 2001.
- the prediction PG for BPG # 1 time-multiplexed by the second multiplexing section 1102 of the third slot is output.
- the directional beam buffer 1008 The amplitude and phase control amount of the deceived directional beam (B PG # 1) is read out, and amplitude and phase control is performed on the detection pilot and data symbol series.
- the directional beam (20 04 a, 20 04 b) of B PG # 1 is output, and the prediction pilot is output as described above.
- the 5th slot is the output of the 1st beamform part 1006 of the 4th slot (detection pipe and data symbol series multiplied by the directivity gain of B PG # 1) ⁇ Second beamform part 1
- the output of 0 1 1 (predicted pilot multiplied by the directivity gain of B PG # 3) is time-multiplexed by the second multiplexing unit 1 0 1 2.
- the pilot for prediction is output by the directional beam (20 0 5 a, 20 0 5 b) of BPG # 2.
- the sixth slot outputs the signal multiplexed by the second multiplexing unit in the fifth slot.
- B PG # 1 directional beams (20 04 a, 2004 b) and B PG # 3 directional beams (20 0 6 a, 20 0 6 b) are output.
- the pilot beam for detection and the data symbol sequence are output in the directional beam of BPG # 1, and the prediction pilot is output in the directional beam of BPG # 3.
- the above is the essence of directional beam control of the present invention.
- this directional beam control there is feedback by the prediction pie-tart transmitted by BPG # 1 before the amplitude phase control corresponding to B PG # 1 is performed by the first beamformer.
- the scheduling according to the back information and the detection pilot are multiplexed and transmitted.
- the alignment of the directional beam input to the first beamform section 1 0 0 6 and the prediction directional beam from which the data symbol sequence is generated (same BPG) 1 Effect of the present invention It is a feature to obtain.
- the amount of data stored in the directional beam buffer 1008 is adjusted, and the delay time slot from writing to reading to the buffer is adjusted. Furthermore, aligning this adjustment amount in all radio base station equipment is correct, including inter-cell interference. Required for SINR estimation.
- FIG. 8 shows a first embodiment relating to prediction directional beam determination according to the present invention.
- the first embodiment describes prediction directional beam determination when the radio base station apparatus is a switched beam base station. .
- the fixed beam selection unit (Beam Selector) 1 1 0 1 is a prediction directivity pattern among the fixed directivity beams that the radio base station apparatus holds in the fixed beam buffer (Fixed Beam Buffer) 1 1 0 3. , And the one to be used as the directivity pattern for detection after several times, and the beam identification number is notified to the directional beam notification unit 1 1 0 2.
- information held in the radio base station apparatus is read out. Specifically, information is read from the queue buffer 1 0 0 1 a, the feedback information buffer 1 0 0 1 b, and the terminal orientation buffer 1 0 0 1 c. However, it is not essential to read out these pieces of information.
- the fixed beams may be selected sequentially or randomly.
- the queue buffer 1 0 0 1 a and the feedback information buffer 1 0 0 1 are assumed assuming various fixed beam selection methods. Information can be read from b and the terminal orientation buffer 1 0 0 1 c.
- the directional beam notification unit 1 1 0 2 reads the corresponding amplitude phase control amount from the fixed beam recording unit 1 1 0 3 according to the beam identification number notified from the fixed beam selection unit 1 1 0 1, Transmit to the beam buffer 1 0 0 8 and the second beamform unit 1 0 1 1.
- the fixed beam recording unit 1 1 0 3 records the amplitude phase control amount for each antenna element in association with the beam identification number.
- FIG. 9 shows a second embodiment regarding prediction directional beam determination according to the present invention.
- the radio base station apparatus is a base station that outputs an arbitrary directional beam pattern. The determination of the directional beam for prediction will be described.
- the direction decision unit (Direction Decision Unit) 1 1 0 4 determines the beam direction and null direction of the directional beam generated by the directional beam generation unit (B earn Generator) 1 1 0 5 for each beam identification number.
- the directional beam generator 1 1 0 5 is notified.
- information held in the radio base station apparatus is read out. Specifically, information is read from the queue buffer 1 0 0 1 a, the feedback information buffer 1 0 0 1 b, and the terminal orientation buffer 1 0 0 1 c.
- the effect of the present invention can be obtained by any method. Therefore, it is possible to read information from the queue buffer 100 0 1 a, the feedback information buffer 1 0 0 1 b, and the terminal orientation buffer 1 0 0 1 c assuming various direction determination methods.
- the directional beam generation unit 1 1 0 5 transmits the transmission directivity for each beam identification number based on the beam direction for each beam identification number, the null direction, and the transmission antenna arrangement specified by the direction determination unit 1 1 0 4. Generate a pattern.
- an example of directional beam generation using simple null steering is shown.
- the array response vector in the beam direction is defined as follows.
- ⁇ ⁇ is the beam direction counter
- ⁇ is the i-th beam direction
- () is the i-th beam direction
- p is the beam direction counter, is the j-th beam direction,) is the j-th beam direction, and “the phase difference from the reference point at the“ th ”transmission antenna.
- weight vector which is a vector of amplitude and phase control amount for each antenna element for steering the null.
- w indicates the amplitude / phase control amount to the antenna element, and ⁇ indicates transposition.
- NW is the number in the beam direction and Nc is the number in the null direction.
- the weight vector and beam identification number calculated above are associated and transmitted to the directional beam notification unit 1 1 0 2.
- the directional beam notification unit 1 1 0 2 associates the weight vector and the beam identification number, and transmits them to the directional beam buffer 1 0 8 and the second beam form unit 1 0 1 1.
- FIG. 10 is a block diagram showing the configuration of the wireless terminal device according to the embodiment of the present invention.
- the radio communication terminal apparatus includes a transmission / reception antenna 3001, and a front end unit 3002 that performs conversion between a baseband and an RF band.
- Frontend 3 0 0 2 has 1) ⁇ , ADC, filter, amplifier and frequency oscillator.
- the terminal synchronization unit (Slot Sync Unit) 3 0 0 3 finds the reception timing of the pie slot by the correlation calculation of the common pie slot to find the beginning of the slot of the downlink signal, The slot start timing can be determined based on the pie-mouth offset and the pie-mouth reception timing. The start timing of the slot found in the same part 3 0 0 3 is notified to the reception signal dividing part (Divider) 3 0 4.
- the received signal dividing unit 30 04 divides the received signal based on the slot head timing notified from the terminal synchronization unit 30 03 and the known slot format (see FIG. 5). Specifically, a common pilot and a common control signal (CP 1 0 4 and CO MM ON—DATA 1 0 5 in FIG. 5) 1) are transmitted to a common signal restoration unit (Common Signal Restoration Unit) 3 0 0 5 Pair of detection and data symbol sequences for detection (DP 1 0 1 and DATA 1 0 2 in Fig. 5) Force Transmitted to FL Data Restoration Unit 3 0 0 6 for prediction pilot ( PP 1 0 3) Force in Fig. 5 Quality information generator (CQ Estimator) Sent to 3 0 7.
- a common pilot and a common control signal CP 1 0 4 and CO MM ON—DATA 1 0 5 in FIG. 5
- a common signal restoration unit Common Signal Restoration Unit
- DP 1 0 1 and DATA 1 0 2 in Fig. 5 Force Transmitted to FL Data Restoration Unit 3 0 0
- the control data restoration unit 300 detects the common control signal with the common pilot, and then acquires the control data transmitted by the radio base station apparatus by demodulating and decoding. From the beam assignment control information in the control data, the terminal identifier assigned to the slot for each beam identifier is known. The wireless terminal device compares the terminal identifier of its own station with the terminal identifier assigned to the slot, and can determine whether or not a directional beam is assigned.
- the control data restoration unit 3 0 0 5 notifies the data symbol restoration unit 3 0 6 to that effect, and the data symbol restoration unit 3 0 0 6 transmits with the directional beam for detection.
- the restored data symbol sequence is not restored.
- the control data restoration unit 30 0 5 notifies the assigned beam identifier to the data symbol restoration unit 3 06, and the data symbol restoration unit 3 0 06 sends the beam identifier.
- the quality information generation unit 30 07 estimates SINR using the pilot of each beam as a desired signal and converts it to CQI.
- D R C corresponds to C Q I.
- the C Q I for each beam identifier is notified to the transmission data generation unit 3 0 8, but it is also within the scope of the present invention to notify only the C Q I having the highest SINR.
- Transmission data generator (RL Data Generator) 3 0 0 8 is a quality information generator 3 0 0
- the CQI for each beam identifier output from 7 is rearranged, encoded and modulated according to the protocol promised with the radio base station equipment.
- the modulated signal is converted into baseband-one RF band at the front end unit 3002, and transmitted to the radio base station apparatus.
- the present invention can be applied to all downlink communications in a bucket exchange type radio communication system, but requires synchronization between base stations because it aims at correct estimation of inter-cell interference.
- the cdma2000 lxEV-DO is the only bucket-switched wireless communication system that supports inter-base station synchronization in the existing system, but it can also be applied to other packet-switched wireless communication systems by ensuring synchronization between base stations. .
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Abstract
Description
Claims
Priority Applications (7)
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CN2006800540395A CN101411239B (zh) | 2006-04-06 | 2006-04-06 | 无线通信***、无线基站装置和无线终端装置 |
EP20140002637 EP2840719A1 (en) | 2006-04-06 | 2006-04-06 | Wireless communication system, radio base station apparatus and radio terminal apparatus |
EP20060731729 EP2007157B1 (en) | 2006-04-06 | 2006-04-06 | Wireless communication system, radio base station apparatus and radio terminal apparatus |
JP2008508447A JP4705162B2 (ja) | 2006-04-06 | 2006-04-06 | 無線通信システム、無線基地局装置及び無線端末装置 |
US12/295,917 US8340018B2 (en) | 2006-04-06 | 2006-04-06 | Wireless communication system, radio base station apparatus and radio terminal apparatus |
PCT/JP2006/307793 WO2007113923A1 (ja) | 2006-04-06 | 2006-04-06 | 無線通信システム、無線基地局装置及び無線端末装置 |
US13/724,130 US20130114458A1 (en) | 2006-04-06 | 2012-12-21 | Wireless communication system, radio base station apparatus and radio terminal apparatus |
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PCT/JP2006/307793 WO2007113923A1 (ja) | 2006-04-06 | 2006-04-06 | 無線通信システム、無線基地局装置及び無線端末装置 |
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US13/724,130 Continuation US20130114458A1 (en) | 2006-04-06 | 2012-12-21 | Wireless communication system, radio base station apparatus and radio terminal apparatus |
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WO2007113923A1 true WO2007113923A1 (ja) | 2007-10-11 |
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US (2) | US8340018B2 (ja) |
EP (2) | EP2840719A1 (ja) |
JP (1) | JP4705162B2 (ja) |
CN (1) | CN101411239B (ja) |
WO (1) | WO2007113923A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
EP2007157B1 (en) | 2014-11-05 |
JP4705162B2 (ja) | 2011-06-22 |
US20130114458A1 (en) | 2013-05-09 |
EP2007157A1 (en) | 2008-12-24 |
US20090279512A1 (en) | 2009-11-12 |
JPWO2007113923A1 (ja) | 2009-08-13 |
EP2007157A4 (en) | 2013-05-22 |
CN101411239B (zh) | 2010-12-22 |
US8340018B2 (en) | 2012-12-25 |
CN101411239A (zh) | 2009-04-15 |
EP2840719A1 (en) | 2015-02-25 |
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