WO2006095398A1 - 無線通信システム - Google Patents
無線通信システム Download PDFInfo
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- WO2006095398A1 WO2006095398A1 PCT/JP2005/003867 JP2005003867W WO2006095398A1 WO 2006095398 A1 WO2006095398 A1 WO 2006095398A1 JP 2005003867 W JP2005003867 W JP 2005003867W WO 2006095398 A1 WO2006095398 A1 WO 2006095398A1
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- cqi
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/22—Negotiating communication rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
Definitions
- the present invention relates to a radio communication system, and more particularly to a communication apparatus, a transmission apparatus, and a mobile station that transmit a parameter (for example, CQI) corresponding to the reception environment to a transmission apparatus that switches a transmission rate based on the reception environment. .
- a parameter for example, CQI
- a W-CDMA (UMTS) mobile communication system is a radio communication system in which a line is shared by multiple users.
- the core network 1, radio base station controller (RNC: Radio Network Controller) 2 3, Demultiplexer 4, 5, Radio base station (Node B) 6-6, Mobile
- the core network 1 is a network for performing routing in the mobile communication system.
- the core network can be configured by an ATM switching network, a packet switching network, a router network, or the like.
- the core network 1 is also connected to other public networks (PSTN) or the like, and the mobile station 7 can communicate with a fixed telephone or the like.
- PSTN public networks
- Radio base station control devices (RNC) 2 and 3 are positioned as higher-level devices of radio base stations 6-6.
- the system that controls these radio base stations 6-6 controls these radio base stations 6-6 (management of radio resources to be used, etc.)
- It has the ability. It also has a handover control function that receives signals from one mobile station 7 from a plurality of subordinate radio base stations, selects data with better quality, and sends it to the core network 1 side during handover. .
- the demultiplexers 4 and 5 are provided between the RNC and the radio base station, demultiplex signals received from the RNC 2 and 3 to the radio base stations, output the signals to the radio base stations, and Control is performed by multiplexing the signals from the line base station and passing the bow to each RNC.
- Radio base stations 6-6 manage radio resources by RNC2, and radio base stations 6, 6 manage radio resources by RNC3.
- the wireless communication with the mobile station 7 is performed.
- the mobile station 7 is located in the radio area of the radio base station 6 to establish a radio line with the radio base station 6 and communicate with other communication devices via the core network 1.
- the interface between the core network 1 and RNC 2, 3 is the Iu interface
- the interface between RNC 2, 3 is the Iur interface
- the interface between RNC 2, 3 and each radio base station 6 is the Iub interface
- radio base station The interface between 6 and the mobile station 7 is referred to as a Uu interface
- a network formed by 2-6 devices is particularly referred to as a radio access network (RAN).
- the line between the core network 1 and RNC2 and 3 is shared for the Iu and Iur interfaces
- the line between the RNC2 and 3 and the demultiplexer 4 and 5 is for multiple radio base stations. Shared on the Iub interface!
- HSDPA High Speed Downlink Packet Access
- HSDPA High Speed Downlink Packet Access
- HSDPA adopts Adaptive Code Modulation and Coding (AMC), for example, QPSK modulation scheme (QPSK modulation scheme) and 16-value QAM scheme (16 QAM scheme) are used for radio base stations and mobile stations. It is characterized by adaptive switching according to the wireless environment.
- AMC Adaptive Code Modulation and Coding
- HSDPA adopts H-ARQ (Hybrid Automatic Repeat reQuest) method.
- H-ARQ Hybrid Automatic Repeat reQuest
- a mobile station detects an error in received data of radio base station power, it makes a retransmission request (transmission of a NACK signal) to the radio base station. Since the radio base station that has received this retransmission request retransmits the data, the mobile station performs error correction decoding using both the already received data and the retransmitted received data. In this way, with H-ARQ, even if there is an error, it has already been received.
- the gain of error correction decoding increases, and as a result, the number of retransmissions can be reduced.
- the ACK signal is also received by the mobile station, data transmission is successful, so retransmission is unnecessary and the next data transmission is performed.
- the main radio channels used for HSDPA are (1) HS-SCCH (High Speed-Shared Control Channel), (2) HS-PDS and H (high Speed-Physical Downlink Shared Channel), ( 3) HS— DPCCH (High Speed-Dedicated Physical Control Channel )
- HS-SCCH and HS-PDSCH are both shared channels in the downlink direction (that is, the downlink that is the direction from the radio base station to the mobile station). It is a control channel that transmits various parameters related to data to be transmitted. In other words, it is a channel for notifying that data transmission is performed via HS-PDSCH.
- the various parameters include, for example, destination information indicating to which mobile station data is transmitted, transmission bit rate information, modulation scheme information indicating which modulation scheme is used to transmit data by HS-PDSCH, spreading code (spreading There are information such as the number of allocations of code) (number of codes) and the pattern of rate matching performed on the transmission data.
- HS-DPCCH is an individual control channel (dedicated control channel) in the uplink direction (that is, an at-printer that is a direction to the mobile station radio base station), and is used for data received via HS-PDSCH. This is used when the mobile station transmits the reception result (ACK signal, NACK signal) to the radio base station depending on whether there is an error or not. That is,
- This channel is used to transmit the reception result of data received via HS-PDSCH. If the mobile station fails to receive data (such as when the received data is a CRC error), the NACK signal is transmitted by the mobile station, so the radio base station performs retransmission control.
- FIG. 11 is an explanatory diagram of channel timing in the HSDPA system. Since W-CDMA employs code division multiplexing, each channel is separated by a code. CPICH (Common Pilot Channel) and SCH (Synchronization Channel) are downlink common channels, respectively. CPICH is a channel used for channel estimation, cell search, etc. in a mobile station, and is a channel for transmitting a so-called pilot signal. Strictly speaking, the SCH includes a P-SCH (Primary SCH) and an S-SCH (Secondary SCH), and is a channel transmitted in bursts in the first 256 chips of each slot.
- P-SCH Primary SCH
- S-SCH Secondary SCH
- This SCH is received by a mobile station that performs a three-stage cell search, and is used to establish slot synchronization and frame synchronization and to identify a base station code (scramble code).
- SCH is shown wider in the force diagram, which is the length of one slot of 1Z10. The remaining 9Z10 is teed with P-CCPCH (Primary-common control physical channel).
- Each channel is composed of 15 slots to form one frame (10 ms), and one frame has a length equivalent to 2560 chip length.
- CPICH is used as a reference for other channels
- the SCH and HS-SCCH frame heads coincide with the CPICH frame heads! /.
- HS-PDS is used as a reference for other channels
- the head of the CH frame is delayed by 2 slots with respect to HS-SCCH, etc.
- This is a demodulation method corresponding to the modulation method after the mobile station receives the modulation method information via HS-SCCH.
- HS-PDSCH can be demodulated.
- HS_SCCH and HS-PDSCH form one subframe with three slots!
- HS-DPCCH is an uplink channel, and its first slot receives an ACKZNACK signal indicating the HS-PDSCH reception result from the mobile station to the radio base station after about 7.5 slots have elapsed since HS-PDSCH reception. Used to send.
- the second and third slots are used to periodically send back CQI information for adaptive modulation control to the base station.
- the CQI information to be transmitted is calculated based on the reception environment (for example, SIR measurement result of CPICH) measured in the period from 4 slots before 1 slot before CQI transmission. [0006] ⁇ Configuration of mobile station
- FIG. 12 is a block diagram of the main part of a conventional mobile station.
- the radio signal transmitted from the base station is received by the antenna and input to the receiver 1.
- Receiver 1 downconverts the radio signal to a baseband signal, and then performs processing such as quadrature demodulation, AD conversion, and despreading on the obtained baseband signal to perform HS-PDSCH symbol signal, CPICH symbol signal, Receive timing signals (frame synchronization, slot synchronization signal), etc. are output.
- the HS-PDSCH channel estimation filter 2 calculates the average value of CPICH symbol signals for a total of 20 symbols including the n symbols immediately before the current symbol, for example, 10 symbols and the next 10 symbols including the current symbol. The value is sequentially output as a channel estimation value at a symbol period. Since one CPICH slot has 10 symbols, the 10 symbols correspond to 1 slot.
- FIG. 13 is a diagram for explaining the operation of the HS-PDSCH channel estimation filter 2.
- the channel estimation value of the first symbol of the current slot slotfti is the first and tenth symbols of the previous slot slot # nl and the current slot. This is the average value of the CPICH symbol signal of 20 symbols in total including the 1st and 10th symbols of slotfti.
- the channel estimates of the second symbol of the current slot slotfti are the second to tenth symbols of the previous slot slot # nl, the first and first 10th symbols of the current slotfti, and the first slot of the next slot slot # n + l. This is the average value of the CPICH symbol signal of a total of 20 symbols including 1 symbol.
- the channel estimate value of the 10th symbol of the current slot slotfti is the same as the 10th symbol of the previous slot slot # nl and the 1st symbol of the current slot slotfti.
- This is the average value of the CPICH symbol signal of a total of 20 symbols, combining the 10th symbol and the 1st and 9th symbols of the next slot slot # n + l.
- HS-PDSCH symbol buffer 3 holds the HS-PDSCH symbol for one slot period and inputs it to HS-PDSCH channel compensation processing section 4. That is, the HS-PDSCH symbol is delayed and input to the HS-PDSCH channel compensation processing unit 4 for one slot period until the channel estimation value is obtained.
- the HS-PDSCH channel compensation processing unit 4 performs channel compensation processing on the HS-PDSCH symbol signal using the channel estimation value as shown in the lower part of FIG.
- Demodulation processor 5 uses channel-compensated symbol signals.
- the CRC calculation unit 7 performs a CRC calculation for which there is an error in the decoding result for each block. If no error is detected, the CRC calculation unit 7 outputs decoded data and generates an ACK, and if an error is detected. NACK is generated and input to the HS-DPCCH generator 13.
- the CPICH channel estimation filter 8 for SIR calculation calculates an average value of the CPICH symbol signals for the last 20 symbols including the current symbol, and sequentially outputs the average value as a channel estimation value at a symbol period.
- FIG. 14 is a diagram for explaining the operation of the CPICH channel estimation filter 8.
- the channel estimation value of the first symbol in the current slot slotfti is the second first tenth symbol of the slot slot # n-2 and the previous slot #nl. This is the average value of the CPICH symbol signal of 20 symbols in total, which is the sum of the first 10th symbols and the first symbol of the current slot slotfti.
- the channel estimate for the previous slot is the sum of the 3rd-10th symbol in slot slot # n-2, the 1st 10th symbol of the previous slot #nl, and the 1st 1st 2nd symbol of the current slot slotfti. This is the average value of the CPICH symbol signal of the symbol.
- the channel estimate value of the 10th symbol of the current slot slotfti is the 1st 1st 10th symbol of the previous slot #nl and the 1st 1st 10th symbol of the current slot slotfti. This is the average value of the total 20 CPICH symbol signals.
- CPICH channel estimation filter 8 for SIR calculation uses CPICH symbol signals for a total of 20 symbols including the 10 symbols immediately before the current symbol and the next 10 symbols including the current symbol, as in HS-PDSCH channel estimation filter 2. The channel estimate cannot be calculated! / The reason will be described later.
- the CPIR compensation processing unit 9 for SIR calculation performs channel compensation processing on the CPICH symbol signal using the channel estimation value of the CPICH for SIR calculation as shown in the lower part of FIG.
- the processing unit 10 demodulates the CPICH symbol using the channel-compensated symbol signal, and the CPICH-SIR calculation processing unit 11 performs a well-known SIR calculation process using the demodulated CPICH symbol in the reception environment of the mobile station. A certain CPICH-SIR is output.
- the CPICH-SIR ⁇ CQI report value converter 12 has a correspondence table between CPICH-SIR and CQI as shown in Fig. 15. Therefore, the CQI report value corresponding to the input CPICH-SIR is stored in the table. Obtained from the bull and input to the HS-DPCCH generator 13.
- the downlink reception timing monitoring unit 14 receives the reception timing signal (frame synchronization, The downlink transmission timing is monitored based on the slot synchronization signal), and the uplink transmission timing management unit 15 inputs the transmission timing signal to the HS-DPCCH generation unit 13.
- the HS-DPCCH generation unit 13 includes an HS-DPCCH that includes a CQI report value corresponding to the CPICH-SIR of the previous 4 slots for each subframe and has an ACK / NACK signal as appropriate, as described in FIG. It is generated, encoded by the code processor 14 and input to the modulation processor 15.
- the modulation processing unit 15 performs spreading processing, DA conversion, and quadrature modulation processing, and the transmitter 16 converts the frequency of the baseband signal into an RF signal and transmits it to the base station from the antenna.
- the base station demodulates the HS-DPCCH, determines the transport block size, the number of multiplexed codes, and the modulation method from the CQI table based on the CQI report value, and transmits data using HS-PDSCH according to these With
- the HS-PDSCH channel estimation filter 2 delays the HS-PDSCH symbol by one slot, thereby summing up the 10 symbols immediately before the current symbol and the next 10 symbols including the current symbol.
- An average value of CPICH symbol signals for 20 symbols is calculated, and the average value can be used as a channel estimation value of the current symbol, so that channel estimation can be performed with high accuracy.
- the channel estimation filter 8 of the CPIR for SIR calculation cannot calculate the channel estimation value using the next 10 symbols including the current symbol, like the channel estimation filter 2 of HS-PDSCH. This is because the CQI report value must be obtained from the SIR measured using the CPICH symbols for 3 slots 4 to 1 slot before the current slot and transmitted in the current slot. This is because the CPICH symbol cannot be delayed.
- the CPICH channel estimation value for SIR calculation is inferior to the HS-PDSCH channel estimation value in terms of accuracy.
- channel estimation results change in a short time due to high-speed fusing and the like, and become prominent in an environment where past channel estimates and current channel estimates are different. That is, in the fast fading environment, the CPICH channel estimation value for SIR calculation is considerably lower in accuracy than the HS-PDSCH channel estimation value, and the SIR calculation
- the reception quality of CPICH symbols is considerably degraded from that of HS-PDSCH symbols.
- Fig. 16 is a graph that quantitatively shows the BLER characteristics of HS-PDSCH block error rate vs. fading speed during fixed format reception, and Fig. 17 shows fading.
- Fig. 18 is a graph showing the CQI report value for the fading speed when the CPICH # SIR force is converted to the CQI report value using the conventional technology.
- Fixed format reception means reception when transmission is performed with a fixed block size, modulation method, and number of multicodes.
- an object of the present invention is to enable data transmission at a transmission rate corresponding to the reception quality of HS-PDSCH even in a fading environment.
- the object of the present invention is to determine and report CQI adapted to the fading environment.
- Another object of the present invention is to correct CQI based on the fading speed and to determine the HS-PDSCH data transmission scheme (transmission rate) based on the corrected CQI.
- Non-Patent Document 1 3G TS 25.212 (3rd Generation Partnership Project: Technical Specification Group Radio Access Network; Multiplexing and channel coding (FDD))
- Non-Patent Document 2 3G TS 25.214 (3rd Generation Partnership Project: Technical Specification roup Radio Access Network; Physical layer procedures (FDD)) Disclosure of invention
- the present invention is a communication device that transmits a parameter according to a reception environment to a transmission device that switches a transmission rate based on the reception environment, and includes a reception environment measurement unit that measures the reception environment, and a communication device.
- a forging environment measurement unit for measuring a fading environment, a parameter correction unit for correcting the parameter according to the reception environment based on the fading environment, and a transmission unit for transmitting the parameter to a transmission device are provided.
- the parameter correction unit generates a reception environment measurement value correction unit that corrects the reception environment measurement value based on the fading environment, and generates the parameter according to the corrected reception environment measurement value. It consists of a parameter generator.
- the parameter correction unit is a conversion table for converting the reception environment measurement value into the parameter, and includes a reception environment measurement value provided corresponding to each of a plurality of fading environments.
- the parameter conversion table includes a conversion unit that converts the reception environment measurement value into the parameter using a table corresponding to the measured fading environment.
- the present invention is a mobile station that transmits a CQI corresponding to a reception environment to a base station that switches a transmission rate based on the reception environment, and measures the reception environment based on the reception quality of a CPICH symbol.
- a fading rate measuring unit for measuring the fading environment in the mobile station based on the fading rate
- a CQI correcting unit for correcting CQI according to the received quality based on the fading rate
- the corrected CQI Is transmitted to the transmitting device is a mobile station that transmits a CQI corresponding to a reception environment to a base station that switches a transmission rate based on the reception environment, and measures the reception environment based on the reception quality of a CPICH symbol.
- the present invention is a transmission device that acquires parameters according to the reception environment of the reception device and switches the transmission rate based on the parameters, and receives the parameters from the reception device.
- a fusing environment measuring unit for measuring, a parameter correcting unit for correcting the parameters based on the fusing environment, and a transmission control unit for switching the transmission rate based on the corrected parameters are provided.
- the CQI adapted to the fading environment can be determined, data can be transmitted at a transmission rate corresponding to the reception quality of the HS-PDSCH even in the fading environment. Therefore, the throughput of the communication system can be improved without excessive quality.
- FIG. 1 is a configuration diagram of a mobile station according to a first embodiment.
- FIG. 2 is an example of a SIR offset value / fading speed correspondence table.
- FIG. 3 is a block diagram of the main part of the base station.
- FIG. 4 is a configuration diagram of a mobile station according to a second embodiment.
- FIG. 5 is an explanatory diagram of a CQI ⁇ CPICH-SIR conversion table for converting CPICH-SIR to CQI.
- FIG. 6 is a block diagram of a mobile station in the third embodiment.
- FIG. 7 is an example of a CQI offset value 'fading speed correspondence table.
- FIG. 8 is a block diagram of a base station according to a fourth embodiment.
- FIG. 9 A configuration example of a W-CDMA mobile communication system.
- FIG. 10 is an explanatory diagram of main radio channels used for HSDPA.
- FIG. 11 is an explanatory diagram of channel timing in the HSDPA system.
- FIG. 12 is a block diagram of a main part of a conventional mobile station.
- FIG. 13 is an explanatory diagram of channel estimation of HS-PDSCH.
- FIG. 14 is an explanatory diagram of channel estimation of CPICH for SIR calculation.
- FIG. 16 is a graph quantitatively showing HS-PDSCH block error rate BLER characteristics with respect to fading speed during fixed format reception.
- FIG. 17 is a graph that quantitatively shows CPICH # SIR characteristics with respect to fading speed.
- FIG. 18 is a graph showing the CQI report value with respect to the fusing speed when converted to the CPICH # SIR force CQI report value using the conventional technology.
- FIG. 1 is a block diagram of the mobile station of the first embodiment.
- the radio signal transmitted from the base station is received by the antenna and input to the receiver 51.
- the receiver 51 down-converts the radio signal into a baseband signal, and then performs processing such as quadrature demodulation, AD conversion, and despreading on the obtained baseband signal to perform HS-PDSCH symbol signal and CPICH symbol signal.
- Receive timing signal (frame synchronization, slot synchronization signal), etc.
- the HS-PDSCH channel estimation filter 52 calculates the average value of CPICH symbol signals for a total of 20 symbols including the n symbols immediately before the current symbol, for example, 10 symbols and the next 10 symbols including the current symbol, and calculates the average value.
- the channel estimation value is output sequentially at the symbol period (see Fig. 13).
- the HS-PDSCH symbol buffer 53 holds HS-PDSCH symbols for one slot period (10 Bol
- the HS-PDSCH channel compensation processing unit 54 uses the channel estimation value calculated by the HS-PDSCH channel estimation filter 52.
- the HS-PDSCH symbol signal is output after being subjected to channel compensation processing.
- the demodulation processing unit 55 demodulates the HS-PDSCH symbol using the channel-compensated symbol signal
- the decoding processing unit 56 performs error correction decoding processing on the demodulated signal
- the CRC calculation unit 57 decodes each transport block. If there is an error in the result, CRC calculation is performed. If no error is detected, decoded data is output and an ACK is generated. If an error is detected, a NACK is generated and input to the HS-DPCCH generator 58. To do.
- the CPIR channel estimation filter 59 for SIR calculation calculates the average value of the CPICH symbol signal for the last 20 symbols including the current symbol, and sequentially outputs the average value as the channel estimation value for SIR calculation in the symbol period ( (See Figure 14).
- CPIR channel compensation processing unit 60 for SIR calculation performs channel compensation processing on the CPICH symbol signal using the channel estimation value for CPIR for SIR calculation, and demodulation processing unit 61 uses the channel-compensated symbol signal for CPICH symbol.
- the CPICH-SIR calculation processing unit 62 performs a well-known SIR calculation process using the demodulated CPICH symbol to calculate and output SIR (CPICH-SIR) which is the reception quality of CPICH.
- the fusing speed measuring unit 63 measures the fusing environment of the mobile station by a well-known method. For example, the phase fluctuation rate of the CPICH signal per unit time (one symbol period) is measured, and the fading speed F at the mobile station is defined as the fading environment based on the phase fluctuation rate.
- the speed correspondence table 64 shows the correspondence between the fading speed F and the SIR offset value in advance.
- Figure 2 shows an example of the SIR offset value 'fading speed correspondence table, which measures the difference between the SIR at the fading speed F force ⁇ and the SIR at the specified fading speed.
- the difference is created as an SIR offset at the predetermined fading speed. (See Figure 17).
- Fading speed 'SIR offset conversion unit 65 depends on the measured fading speed F
- the SIR offset value ⁇ CPICH-SIR is obtained from the SIR offset value 'fading speed correspondence table 64 and output.
- the CPICH-SIR correction control unit 66 calculates the CPICH-SIR output from the CPICH-SIR calculation processing unit 62 as follows:
- CPICH- SIR CPICH-SIR + ⁇ CPICH- SIR
- This corrected CPICH-SIR can be regarded as an SIR of HS-PDSCH symbols even in a fading environment.
- the CPICH-SIR'CQI report value conversion unit 67 obtains the CQI report value corresponding to the CPICH-SIR corrected using the conversion table (see FIG. 15) and inputs it to the HS-DPCCH generation unit 58.
- the downlink reception timing monitoring unit 68 monitors the downlink timing based on the reception timing signal (frame synchronization, slot synchronization signal), and the uplink transmission timing management unit 69 transmits the transmission timing signal to the HS-DPCCH generation unit 58.
- the HS-DPCCH generation unit 58 includes an HS-DPCCH that includes a CQI report value corresponding to the CPICH-SIR of the previous 4 slots for each subframe and has an ACK / NACK signal as appropriate. It is generated, encoded by the code processor 70 and input to the modulation processor 71.
- the modulation processing unit 71 performs spreading processing, DA conversion, and orthogonal modulation processing, and the transmitter 72 converts the frequency of the baseband signal into an RF signal and transmits it to the base station from the antenna.
- FIG. 3 is a block diagram of the main part of the base station.
- the receiving unit 31 receives the radio signal transmitted from the mobile station, down-converts it to a baseband signal, and then performs processing such as quadrature demodulation, AD conversion, and despreading on the baseband signal to perform HS-DPCCH symbols. Signals and other channel symbol signals are output.
- the HS-DPCCH demodulation / decoding unit 32 demodulates and decodes the HS-DPCCH symbol signal and inputs the CQI report value and the ACK / NACK signal to the scheduling processing unit 33.
- the scheduling processing unit 33 performs retransmission control based on ACK / NACK and determines the transmission rate based on the CQI report value.
- the scheduling processing unit 33 obtains the transmission block size (number of bits) TBS, the number of multicodes, and the modulation type according to the CQI report value from the built-in CQI mapping table CQIMTBL. Data controller 34 and transmitter 35.
- the transmission data control unit 34 creates HS-PDSCH data based on the TBS and the number of multicodes and inputs the data to the transmission unit 35.
- the transmission unit 35 performs spreading processing, DA conversion processing, and scheduling processing on the input data. Modulation is performed using the modulation method instructed by unit 33, and the frequency is up-converted and transmitted from the antenna.
- the transmission data control unit 34 and the transmission unit 35 create and transmit HS-SCCH control data prior to HS-PDSCH.
- the CPICH-SIR correction control unit 66 (Fig. 1) can accurately output the SIR of the HS-PDSCH symbol even in a fading environment, so that the mobile station has an influence on the fading environment. Therefore, it is possible to report an appropriate CQI according to the HS-PDSCH reception environment to the base station. As a result, the throughput of the communication system can be improved without causing excessive quality as in the prior art.
- FIG. 4 is a block diagram of a mobile station according to the second embodiment. Components identical with those of the first embodiment shown in FIG. The difference is that (l) SIR offset value 'fading speed correspondence table 64, fading speed' SIR offset conversion section 65 and CPICH-SIR correction control section 66 are deleted, and (2) multiple fading speeds are supported.
- the CQI'CPICH-SIR conversion table 81 that converts CPICH-SIR to CQI is provided, and (3) the CPICH-SIR'CQI report value conversion unit 82 uses a table corresponding to the measured fusing speed F.
- a CQI 'CPICH-SIR conversion table 81 for converting CPICH-SIR into CQI is prepared as shown in FIGS. 5A, 5B, and 5C in advance corresponding to each of a plurality of fading speeds.
- the CQI report value (CQI) for a given CPICH-SIR when the fading speed is 0 is obtained.
- CPICH-SIR is measured when the fading speed is set to a predetermined speed (for example, 60 km / h), and the calculated CQI report value (CQI) is calculated from the measured CPICH-SIR (SIR).
- CQI report value If CPICH-SIR is changed in the range of 0 (dB) to 30 (dB) and the same processing is performed, the CQI 'CPICH-SIR conversion table can be obtained when the fading speed is 60 km / h. Similarly, CQI 'CPICH-SIR conversion tables at other fading speeds can be obtained. In Fig. 5, the force when three CQI'CPICH-SIR conversion tables are prepared. For example, it can be provided at every fading speed lOKmZh.
- CPICH-SIR'CQI report value conversion unit 82 converts CPICH-SIR into a CQI report value using a table corresponding to fading rate F measured by fading rate measurement unit 63.
- the CQI report value is obtained using the CQI ⁇ CPICH-SIR conversion table corresponding to the fading rate, input to the HS-DPCCH generation unit 58, and transmitted to the base station. If there is no table corresponding to the measured fading speed F, interpolation is performed.
- FIG. 6 is a block diagram of the mobile station of the third embodiment. Components identical with those of the first embodiment of FIG. The difference is that (l) SIR offset value 'fading speed correspondence table 64, fading speed' SIR offset conversion unit 65 and CPICH-SIR correction control unit 66 are deleted. (2) CQI offset value 'fading speed correspondence table 91 (3) Fading, in which the correspondence between the fading speed F and CQI offset value is stored in advance.
- CQI correction unit 93 outputs CQI output from CPICH-SIR' CQI report value converter 67
- Figure 7 shows an example of a table corresponding to the CQI offset value 'fading speed'.
- CQI is calculated as the CQI offset at the specified fading speed. (See Fig. 18).
- the corrected CQI report value in the third embodiment can be regarded as a correct CQI report value according to the actual SIR of the HS-PDSCH symbol even in a fading environment.
- CQI correction section 93 can output a CQI report value corresponding to the SIR of the HS-PDSCH symbol even in a fading environment. Therefore, the mobile station can report an appropriate CQI according to the HS-PDSCH reception environment to the base station without being affected by the fading environment. As a result, the quality of the communication system can be improved without excessive quality as in the prior art.
- FIG. 8 is a block diagram of a base station according to the fourth embodiment. Components identical with those of the base station according to the first embodiment shown in FIG. The difference is that (1) the fading speed measurement unit 41 that measures the fading speed from the pilot signal included in the dedicated physical channel DPCH is provided, and (2) the CQI offset value 'fading speed correspondence table 42 is provided, The correspondence between fading speed F and CQI offset value (Fig. 7) is stored in advance. (3) CQI correction unit 43
- I the CQI offset value according to the fading speed F.
- a CQI is the CQI offset value.
- the corrected CQI report value in the fourth embodiment can be regarded as a correct CQI report value according to the actual SIR of the HS-PDSCH symbol even in a fading environment.
- the CQI correction unit 43 can output a CQI report value corresponding to the SIR of the HS-PDSCH symbol even in a fading environment. Therefore, the transmission rate can be determined using an appropriate CQI according to the HS-PDSCH reception environment without being affected by the fading environment of the mobile station. As a result, the throughput of the communication system can be improved without excessive quality as in the prior art.
- the same CQI correction control as in the third embodiment in the mobile station is performed in the base station.
- the same CQI correction control in the mobile station as in the first and second embodiments is performed in the base station. It can also be done at the station.
- the reception quality of the CPICH symbol is measured as the reception environment of the mobile station, but the reception environment can also be measured by other means.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007506931A JPWO2006095398A1 (ja) | 2005-03-07 | 2005-03-07 | 無線通信システム |
EP05720139A EP1858177A1 (en) | 2005-03-07 | 2005-03-07 | Wireless communication system |
PCT/JP2005/003867 WO2006095398A1 (ja) | 2005-03-07 | 2005-03-07 | 無線通信システム |
US11/896,436 US20080004062A1 (en) | 2005-03-07 | 2007-08-31 | Radio communication system |
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PCT/JP2005/003867 WO2006095398A1 (ja) | 2005-03-07 | 2005-03-07 | 無線通信システム |
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US11/896,436 Continuation US20080004062A1 (en) | 2005-03-07 | 2007-08-31 | Radio communication system |
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WO2006095398A1 true WO2006095398A1 (ja) | 2006-09-14 |
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US (1) | US20080004062A1 (ja) |
EP (1) | EP1858177A1 (ja) |
JP (1) | JPWO2006095398A1 (ja) |
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Cited By (8)
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JP2007180925A (ja) * | 2005-12-28 | 2007-07-12 | Fujitsu Ltd | 移動端末装置及び同装置におけるチャネル補償方法 |
JP2008141313A (ja) * | 2006-11-30 | 2008-06-19 | Fujitsu Ltd | 干渉電力推定装置及び干渉電力推定方法 |
JP2009004880A (ja) * | 2007-06-19 | 2009-01-08 | Fujitsu Ltd | 生成装置、生成方法および移動端末 |
JP2009077131A (ja) * | 2007-09-20 | 2009-04-09 | Fujitsu Ltd | 無線通信装置および伝搬環境指標分散抑制方法 |
JP2009267441A (ja) * | 2008-04-21 | 2009-11-12 | Ntt Docomo Inc | 通信端末装置、受信環境報告方法 |
WO2011013781A1 (ja) * | 2009-07-29 | 2011-02-03 | 京セラ株式会社 | 無線基地局及び通信制御方法 |
JP5126230B2 (ja) * | 2007-08-07 | 2013-01-23 | 富士通株式会社 | 誤り検出方法 |
JP2018513586A (ja) * | 2015-03-05 | 2018-05-24 | テレフオンアクチーボラゲット エルエム エリクソン(パブル) | 復号マージンに基づく送信特性の構成 |
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US8271013B2 (en) * | 2006-10-31 | 2012-09-18 | Telefonakbolaget L M Ericsson (Publ) | Method and arrangement for transmitting CQI on the uplink |
CN101309460B (zh) * | 2008-07-14 | 2011-04-20 | 华为技术有限公司 | 多用户资源分配的方法和装置 |
US9107091B2 (en) | 2011-05-23 | 2015-08-11 | Mediatek Inc. | Method and apparatus reporting channel quality indicator of communication system |
US8494039B2 (en) * | 2011-05-23 | 2013-07-23 | Mediatek Inc. | Method and apparatus reporting channel quality indicator of communication system |
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US9668191B2 (en) * | 2012-06-11 | 2017-05-30 | Qualcomm Incorporated | Methods and apparatuses for saving user equipment power by search length reduction |
TWI489126B (zh) * | 2012-12-19 | 2015-06-21 | Ind Tech Res Inst | 一種動態無線訊號強度修正系統與方法 |
US9743296B2 (en) | 2014-05-12 | 2017-08-22 | Motorola Solutions, Inc. | Methods and systems for emulating testing-plan channel conditions in wireless networks |
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GB2371947B (en) * | 2001-02-01 | 2005-02-23 | Fujitsu Ltd | Communications systems |
EP1388964B1 (en) * | 2002-08-06 | 2006-11-22 | Mitsubishi Electric Information Technology Centre Europe B.V. | Transmission quality reporting method |
JP4215601B2 (ja) * | 2003-09-05 | 2009-01-28 | 富士通株式会社 | 無線通信装置 |
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- 2005-03-07 EP EP05720139A patent/EP1858177A1/en not_active Withdrawn
- 2005-03-07 JP JP2007506931A patent/JPWO2006095398A1/ja active Pending
- 2005-03-07 WO PCT/JP2005/003867 patent/WO2006095398A1/ja not_active Application Discontinuation
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2007
- 2007-08-31 US US11/896,436 patent/US20080004062A1/en not_active Abandoned
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JP2008141313A (ja) * | 2006-11-30 | 2008-06-19 | Fujitsu Ltd | 干渉電力推定装置及び干渉電力推定方法 |
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JP2011030139A (ja) * | 2009-07-29 | 2011-02-10 | Kyocera Corp | 無線基地局及び通信制御方法 |
JP2018513586A (ja) * | 2015-03-05 | 2018-05-24 | テレフオンアクチーボラゲット エルエム エリクソン(パブル) | 復号マージンに基づく送信特性の構成 |
US10506557B2 (en) | 2015-03-05 | 2019-12-10 | Telefonaktiebolaget Lm Ericsson (Publ) | Decoding margin based configuration of transmission properties |
Also Published As
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US20080004062A1 (en) | 2008-01-03 |
JPWO2006095398A1 (ja) | 2008-08-14 |
EP1858177A1 (en) | 2007-11-21 |
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