WO2006064806A1 - 無線回線制御局、基地局、移動局、移動通信システム及び移動通信方法 - Google Patents
無線回線制御局、基地局、移動局、移動通信システム及び移動通信方法 Download PDFInfo
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- WO2006064806A1 WO2006064806A1 PCT/JP2005/022882 JP2005022882W WO2006064806A1 WO 2006064806 A1 WO2006064806 A1 WO 2006064806A1 JP 2005022882 W JP2005022882 W JP 2005022882W WO 2006064806 A1 WO2006064806 A1 WO 2006064806A1
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- mobile station
- transmission diversity
- base station
- baseband signal
- soft handover
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- 238000000034 method Methods 0.000 title claims description 70
- 238000010295 mobile communication Methods 0.000 title claims description 35
- 230000005540 biological transmission Effects 0.000 claims abstract description 178
- 238000012545 processing Methods 0.000 claims description 73
- 238000004891 communication Methods 0.000 claims description 47
- 230000008054 signal transmission Effects 0.000 claims description 15
- 230000015556 catabolic process Effects 0.000 description 8
- 238000006731 degradation reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000003786 synthesis reaction Methods 0.000 description 6
- 238000012795 verification Methods 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005562 fading Methods 0.000 description 3
- 239000013598 vector Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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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
- H04B7/022—Site diversity; Macro-diversity
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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
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/12—Access point controller devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/04—Interfaces between hierarchically different network devices
- H04W92/12—Interfaces between hierarchically different network devices between access points and access point controllers
Definitions
- Radio channel control station base station, mobile station, mobile communication system and mobile communication method
- the present invention relates to a radio network controller, a base station, a mobile station, a mobile communication system, and a mobile communication method.
- reception diversity is a technology in which the receiving side receives signals using multiple antennas.
- Transmit diversity is a technique in which a transmitter uses multiple antennas to transmit signals.
- transmission diversity can reduce signal level fluctuations without increasing the circuit scale and the number of antennas on the receiving side, it is mainly applied to signal transmission on the downlink from the base station to the mobile station. ing.
- transmission diversity There are two main types of transmission diversity: open loop transmission diversity and closed loop transmission diversity (see, for example, non-patent document "3GPP RAN TS25.214 V6.2.0.”, June 2004).
- Open loop transmission diversity is a method in which a base station transmits a signal without receiving an instruction from a mobile station
- closed loop transmission diversity is a method in which a base station transmits a signal in accordance with an instruction from a mobile station. is there.
- the mobile station transmits control data instructing the antenna weight to be multiplied by the baseband signal so that the base station can multiply the baseband signal so that a high signal gain S can be obtained by signal synthesis. It is transmitted to the base station via the line. Since the mobile station may cause an error in control data during transmission on the uplink, the mobile station performs antenna verification to determine the antenna weight used by the base station (Non-patent Document 3GPP 25.214 V .5.8.0, Annex A ", April 2004).
- an object of the present invention is to appropriately use transmission diversity and improve reception quality in a mobile station.
- a first feature of the present invention is that the radio network controller is in a soft handover situation of a mobile station. Based on a base station power, a determination unit that determines a transmission diversity method used for signal transmission to the mobile station, and an instruction unit that instructs the base station on the transmission diversity method based on a determination result by the determination unit This is the gist.
- a second feature of the present invention is that a base station generates a baseband signal in accordance with a transmission diversity scheme according to a soft handover situation of the mobile station, and a baseband signal as a frequency.
- the gist of the present invention is to provide a plurality of radio communication units for transmitting the converted radio frequency signals to the mobile station.
- a third feature of the present invention is that a mobile station receives a radio frequency signal that is diversity-transmitted from a base station, and performs a soft handover between a baseband signal obtained by frequency-converting the radio frequency signal. And a baseband signal processing unit that performs decoding according to a transmission diversity method according to the above situation.
- a fourth feature of the present invention is that the mobile communication system determines a transmission diversity scheme to be used for signal transmission from the base station to the mobile station based on the soft handover status of the mobile station. And a base station that generates a baseband signal according to a determination result by the determination unit and transmits a radio frequency signal obtained by frequency-converting the baseband signal to the mobile station.
- a fifth feature of the present invention is that a mobile communication method determines a transmission diversity method to be used for signal transmission from a base station to a mobile station based on a soft handover situation of the mobile station, and the determination The gist is to generate a baseband signal according to the result and transmit a radio frequency signal obtained by frequency-converting the generated baseband signal to the mobile station.
- FIG. 1 is a diagram showing a configuration of a mobile communication system according to an embodiment of the present invention.
- FIG. 2 is a block diagram showing a configuration of a radio network controller according to the embodiment of the present invention.
- FIG. 3 is a graph showing changes in received power according to the embodiment of the present invention.
- FIG. 4 is a block diagram showing a configuration of a base station according to the embodiment of the present invention.
- FIG. 5 is a diagram for explaining a configuration necessary for open-loop transmission diversity and closed-loop transmission diversity according to an embodiment of the present invention.
- FIG. 6 is a diagram showing radio frames and dedicated channels according to the embodiment of the present invention.
- FIG. 7 is a diagram showing antenna weight patterns according to the embodiment of the present invention.
- FIG. 8 is a block diagram showing a configuration of a mobile station according to the embodiment of the present invention.
- FIG. 9 is a flowchart showing the procedure of the mobile communication method when soft handover is stopped according to the embodiment of the present invention.
- FIG. 10 is a flowchart showing a procedure of the mobile communication method at the start of soft handover according to the embodiment of the present invention.
- the mobile communication system 100 includes a plurality of base stations 10a, 10b, 10c, 10d, lOe, a plurality of mobile stations 20a, 20b, 20c, a radio network controller 30, and a core network 40.
- the radio network controller 30 is a device located above the base stations 10a to 10e, and controls radio communication between the base stations 10a to 10e and the mobile stations 20a to 20c performed by establishing a radio channel.
- the radio network controller 30 is connected to the base stations 10a to 10e and the core network 40.
- the radio network controller 30 communicates with the mobile stations 20a to 20c via the base stations 10a to 10e.
- the radio area is divided into cells.
- Each of the base stations 10a to 10e covers the cells la to le and establishes a radio link with a mobile station existing in its own cell.
- Each of the base stations 10a to 10e includes a plurality of antennas 16a and 16b, so that transmission diversity can be applied.
- the radio network controller 30 includes an interface 31 with the base stations 10a to 10e, an interface 34 with the core network 40, a determination unit 32, an instruction Z notification unit 33, and a call control unit. 35.
- the determination unit 32 determines a transmission diversity method to be used for signal transmission from the base station to the mobile station based on the soft handover situation of the mobile station.
- the determination unit 32 determines the transmission diversity scheme to be used by the mobile station using a soft In the case of a handover, it can be determined as open loop transmission diversity. On the other hand, the determination unit 32 can determine the closed-loop transmission diversity when the mobile station is not in soft handover.
- Soft handover means that a mobile station establishes a plurality of radio channels with a base station.
- the radio area is divided into cells.
- the mobile stations 20a to 20c connect to a plurality of base stations and perform soft handover between base stations to establish radio channels with different base stations. Therefore, the determination unit 32 can determine the transmission diversity method to be used based on the number of base stations with which the mobile station communicates simultaneously.
- the mobile station 20a located near the boundary between the cell la covered by the base station 10a and the cell lb covered by the base station 10b includes both the base station 10a and the base station 10b. Connected and established a wireless link. That is, the mobile station 20a is in the soft handover between base stations. Therefore, the determination unit 32 can determine the transmission diversity method to be used as open-loop transmission diversity.
- the mobile station 20c located near the center of the cell Id covered by the base station 10d is connected only to the base station 10d and establishes one radio channel.
- the determination unit 32 can determine the transmission diversity method to be used as closed-loop transmission diversity.
- the mobile stations 20a to 20c can establish a radio link with three or more base stations.
- the determination unit 32 can determine to use closed-loop transmission diversity when the number of base stations with which the mobile station communicates at the same time is one, and to use open-loop transmission diversity when the number is two or more. .
- the determination unit 32 determines a threshold value of a received power difference of a radio frequency signal (Radio Frequency signal, hereinafter referred to as "RF signal”) from a base station in a mobile station for determining whether or not to perform soft handover. Based on the received power difference, the soft handover status can be determined.
- RF signal Radio Frequency signal
- the determining unit 32 stops the soft handover when the received power difference exceeds the threshold, and when the received power difference is less than or equal to the threshold, You can set a value that can be determined to start.
- the determination unit 32 determines whether the mobile station 20a to 20c is connected via the interface 31 or the base station, for example. Notifications.
- the determination unit 32 can acquire the notification that the received power difference has exceeded the threshold of the received power difference and the base station with the low received power.
- the determination unit 32 can acquire notification that the received power difference is less than or equal to the received power difference threshold and the notification of the base station that is transmitting the RF signal received by the mobile station.
- the mobile station 20a receives RF signals from the base station 10a and the base station 10b will be described with reference to FIG.
- the vertical axis represents the received power of the mobile station 20a
- the horizontal axis represents time.
- the received power 101 of the RF signal received by the mobile station 20a from the base station 10a is high, and the received power 102 of the RF signal received from the base station 10b is low.
- the determination unit 32 receives a notification that the received power difference threshold has been exceeded. In this case, the determination unit 32 determines to stop the soft handover.
- the determination unit 32 determines the release of the radio channel between the base station 10b and the mobile station 20a with low received power. Furthermore, since the soft handover status is changed to a state where soft handover is not in progress, the determination unit 32 determines the transmission diversity method to be used as closed loop transmission diversity.
- the received power 102 of the RF signal received by the mobile station 20a from the base station 10b increases, and the received power difference between the received power 101 and the received power 102 is the received power difference.
- the determination unit 32 receives a notification that the received power difference is within the threshold value. In this case, the determination unit 32 determines to start soft handover.
- the determination unit 32 determines the establishment of radio links between the mobile stations 20a and the plurality of base stations 10a and 10b that transmit the RF signal received by the mobile station 20a. Furthermore, the decision unit 32 decides the transmission diversity method to be used as open-loop transmission diversity because the soft handover status is changed during the soft handover.
- the determination unit 32 can switch the transmission diversity method in accordance with the change in the number of base stations with which the mobile stations 20a to 20c communicate simultaneously. Specifically, the determination unit 32 switches to open-loop transmission diversity when the number of base stations to which the mobile stations 20a to 20c are connected simultaneously changes from one to a plurality, and when the number changes from a plurality to one. Is closed loop You can switch to Shinbu Diversity. The determination unit 32 also determines the timing at which the mobile stations 20a to 20c and the base stations 10a to 10e switch the transmission diversity method.
- the determination unit 32 may acquire from the mobile stations 20a to 20c a reception power difference notification or a reception power notification that is not based on the relationship between the reception power difference threshold and the actual reception power difference.
- the determining unit 32 can determine the soft handover status and determine the transmission diversity method by comparing the received power difference threshold with the acquired received power difference.
- the determination unit 32 calculates the received power difference, compares the received power difference threshold with the calculated received power difference, and determines the soft handover status.
- the transmission diversity method can be determined.
- the determination unit 32 can make a determination using, for example, the received power difference of the RF signal transmitted from the base stations 10a to 10e to the mobile stations 20a to 20c through the common pilot channel.
- the radio network controller 30 appropriately determines the soft handover status according to the received power difference in the mobile stations 20a to 20c, and sets the optimum transmission diversity scheme to the base stations 10a to 10e. Can be used.
- the determination unit 32 inputs the determination result to the instruction / notification unit 33.
- the instruction / notification unit 33 functions as an instruction unit that instructs the base station on the transmission diversity scheme based on the determination result by the determination unit 32.
- the instruction / notification unit 33 generates control data including the instruction, and transmits the generated control data to the base stations 10a to 10e via the interface 31.
- the instruction / notification unit 33 designates and releases the mobile station that releases the radio channel to the base station that instructs the release. Instruct. Furthermore, the instruction Z notification unit 33 instructs the base station that maintains the radio channel to switch to closed-loop transmission diversity.
- the instruction Z notification unit 33 establishes a radio channel for a base station that newly establishes a radio channel. Specify the mobile station to be established and instruct establishment, and further instruct to use open-loop transmission diversity. In addition, the instruction / notification unit 33 instructs a base station that has already established a radio channel to switch to open-loop transmission diversity. Instruction Z notification The unit 33 also instructs the base station when to switch the transmission diversity method.
- the instruction / notification unit 33 functions as a notification unit that notifies the mobile station of the transmission diversity scheme based on the determination result by the determination unit 32.
- the instruction / notification unit 33 generates control data including the notification, and transmits the generated notification to the mobile stations 20a to 20c via the interface 31 and the base stations 10a to 10e.
- the instruction / notification unit 33 When the determination result is release of the radio channel and use of closed-loop transmission diversity, the instruction / notification unit 33 notifies the base station that releases the radio channel and the switching to the closed-loop transmission diversity. On the other hand, if the determination result is the establishment of the number of times of radio and the use of open loop transmission diversity, the instruction / notification unit 33 notifies the base station that newly establishes the radio line and the switch to open loop transmission diversity. . The instruction / notification unit 33 also notifies the timing for switching the transmission diversity method.
- the call control unit 35 performs call control.
- the call control unit 35 transmits control data related to call control to the base stations 10a to 10e via the interface 31. Further, the call control unit 35 acquires user data transmitted from the mobile stations 20a to 20c through the uplink 31 from the base stations 10a to 10e via the interface 31, and receives the core network 40 via the interface 34. Forward to.
- the call control unit 35 acquires the user data to be transmitted to the mobile stations 20a to 20c via the downlink via the interface 34, and transfers the user data to the base stations 10a to 1Oe via the interface 31.
- the base stations 10a to 10e will be described in more detail with reference to FIG.
- the base station 10a includes an HWY interface 11 with the radio network controller 30, a baseband signal processing unit 12, a control unit 13, a plurality of radio communication units 14a and 14b, and a plurality of amplifiers. 15 a and 15 b and a plurality of antennas 16 a and 16 b are provided.
- the base stations 10b to 10e have substantially the same configuration as the base station 10a.
- the control unit 13 controls the baseband signal processing unit 12 and the radio communication units 14a and 14b.
- the control unit 13 acquires control data including instructions from the radio network controller 30 via the HWY interface 11.
- the control unit 13 instructs the radio communication units 14a and 14b to establish or release a radio channel with the mobile station based on an instruction to establish or release a radio channel.
- the control unit 13 Based on the instruction of the transmission diversity method, the control unit 13 transmits the instructed transmission diversity Instructs the baseband signal processing unit 12 to generate a baseband signal using the Citi method. The control unit 13 also instructs the baseband signal processing unit 12 at the timing when the transmission diversity method is switched. In addition, the control unit 13 performs call control, radio resource allocation to the mobile stations 20a to 20c, and the like.
- the baseband signal processing unit 12 performs signal processing on the baseband signal.
- the baseband signal processing unit 12 acquires user data and control data to be transmitted to the mobile stations 20a to 20c on the downlink from the HWY interface 11 and the control unit 13.
- the baseband signal processing unit 12 generates a baseband signal including the acquired user data and control data.
- the baseband signal processing unit 12 generates baseband signals transmitted by the antennas 16a and 16b and inputs the baseband signals to the radio communication units 14a and 14b, respectively.
- the baseband signal processing unit 12 generates a baseband signal by performing error correction coding, spreading processing, and the like of data transmitted on the downlink.
- the baseband signal processing unit 12 acquires baseband signals received from the mobile stations 20a to 20c on the uplink from the radio communication units 14a and 14b.
- the baseband signal processing unit 12 extracts user data and control data from the acquired baseband signal and inputs them to the HWY interface 11 and the control unit 13.
- the baseband signal processing unit 12 obtains data by performing despreading processing, RAKE combining, decoding, and the like on the baseband signal received on the uplink.
- the baseband signal processing unit 12 When generating the baseband signal, the baseband signal processing unit 12 generates a baseband signal in accordance with a transmission diversity scheme according to the soft handover situation of the mobile station.
- the baseband signal processing unit 12 receives an instruction from the control unit 13 to use the transmission diversity method specified by the radio network controller 30, and generates a baseband signal according to the instruction.
- the baseband signal processing unit 12 switches the transmission diversity scheme of the baseband signal generated according to the instruction.
- the baseband signal processing unit 12 switches the transmission diversity method of the generated baseband signal at the instructed timing.
- the baseband signal processing unit 12 transmits the transmitter used for baseband signal generation. If the number of base stations to which the mobile station is connected simultaneously becomes one or more, the diversity system is switched to open loop transmission diversity, and when the number is changed from one to one, it is switched to closed loop transmission diversity. be able to.
- the baseband signal processing unit 12 includes a configuration for performing open-loop transmission diversity and a configuration for performing closed-loop transmission diversity. Specifically, the baseband signal processing unit 12 includes an STTD encoder 121 for performing open loop transmission diversity shown in FIG. 5 (a) and a closed loop transmission diversity shown in FIG. 5 (b). An FBI decoder 122 and a plurality of multipliers 123a and 123b are provided.
- STTD Space Time block coding based Transmit anten na Diversity
- the STTD performs symbol conversion for converting the symbol pattern of either antenna by a predetermined method, and transmits an RF signal having a different symbol pattern for each of the antennas 16a and 16b.
- the STTD encoder 121 acquires, for example, a complex signal of data to be transmitted through a downlink dedicated channel or a downlink common channel. Specifically, the STTD encoder 121 obtains a complex signal having a symbol pattern “S, S...”.
- the STTD encoder 121 detects the complex number of the odd symbol S of the acquired symbol pattern.
- STTD encoder 121 calculates the complex conjugate of even symbol S.
- the STTD encoder 121 is an odd number after calculation.
- the STTD encoder 121 uses the symbol pattern "One S *, S * " as an antenna.
- the baseband signal processing unit 12 uses the symbol pattern “S 1, S...” As it is without performing symbol conversion for the baseband signal of the antenna 16a.
- base bass
- the signal processor 12 spreads the complex signal with a different symbol pattern for each of the antennas 16a and 16b, and generates a baseband signal with a different symbol pattern for each of the antennas 16a and 16b.
- Closed-loop transmission diversity controls the amplitude and phase of the transmission signal of each antenna 16a, 16b based on control data called FBI (Feed Back Indicator) transmitted from the base station power mobile station.
- the FBI indicates the antenna weight determined by the mobile station so that the amplitude and phase of the transmission signals from the antennas 16a and 16b are in an optimal pattern (high signal and gain can be obtained by signal synthesis). It is.
- the FBI decoder 122 acquires the FBI transmitted from the mobile station through the uplink dedicated channel via the radio communication units 14a and 14b. Specifically, as shown in FIG. 6, one radio frame is composed of 15 time slots.
- the dedicated channels include a dedicated physical data channel DPDCH (Dedicated Physical Data Channel) for transmitting user data and a dedicated physical control channel DPCCH (Dedicated Physical Control Channel) for transmitting control data.
- the FBI is transmitted using the FBI bit assigned to the dedicated physical control channel DPCCH (Dedicated Physical Control Channel).
- the antenna weight includes W multiplied by the baseband signal that is the basis of the RF signal transmitted by the antenna 16a, and a base that is the basis of the RF signal transmitted by the antenna 16b.
- the antenna weight is expressed by the following equation (1).
- the received signal r at the mobile station is expressed by the following equation (2).
- a and a are the parameters in the propagation path from the antennas 16a and 16b to the mobile station.
- a singing vector, S is a symbol.
- W is determined so that W W + W W is maximized.
- the positive / negative sign of the I axis component of W is determined by the FBI bit in the odd time slot. Indicated by FBI bit in even time slot.
- the FBI decoder 122 determines the acquired FBI. Specifically, the FBI decoder 122 determines the above-described I-axis component and Q-axis component from the FBI. The FBI decoder 122 generates antenna weights W and W based on the determination result. The FBI decoder 122 generates the generated antenna
- Weights W and W are input to multipliers 123a and 123b, respectively.
- the multipliers 123a and 123b obtain, for example, a complex signal of data to be transmitted through the downlink dedicated channel.
- Each of the multipliers 123a and 123b includes a symbol pattern "S, S ...
- the multiplier 123a multiplies the symbol pattern by the antenna weight W acquired from the FBI decoder 122 to generate a symbol pattern “W S W S...”.
- the multiplier 123b uses the antenna weight W acquired from the FBI decoder 122 as a symbol pattern.
- the baseband signal processing unit 12 multiplies the antenna signals different for each of the antennas 16a and 16b, spreads the complex signals having different phases and amplitudes, and performs a different phase for each of the antennas 16a and 16b. Generate an amplitude baseband signal.
- the phase and amplitude of the transmission signals of the antennas 16a and 16b can be sequentially changed according to the instruction of the mobile station force, and gain by signal synthesis can be obtained.
- the baseband signal processing unit 12 inputs the baseband signals of the antennas 16a and 16b generated in this way to the radio communication units 14a and 14b, respectively.
- the radio communication units 14a and 14b respectively acquire baseband signals transmitted from the antennas 16a and 16b from the baseband signal processing unit 12, and frequency-convert them into radio frequency RF signals.
- the radio communication units 14a and 14b input the converted RF signals to the amplifiers 15a and 15b, and transmit the RF signals to the mobile station via the amplifiers 15a and 15b and the antennas 16a and 16b.
- the base station 10a includes a plurality of radio communication units that transmit RF signals obtained by frequency-converting baseband signals to mobile stations. Further, the radio communication units 14a and 14b acquire the RF signals received from the amplifiers 15a and 15b, and convert the frequencies into baseband signals. The radio communication units 14a and 14b input the converted baseband signal to the baseband signal processing unit 12.
- the amplifiers 15a and 15b acquire RF signals from the radio communication units 14a and 14b, amplify them, and perform an antenna test. Input to 16a and 16b.
- the amplifiers 15a and 15b obtain RF signals from the antennas 16a and 16b, amplify them, and input them to the wireless communication units 14a and 14b.
- the antennas 16a and 16b acquire the amplified RF signal of the downlink from the amplifiers 15a and 15b, and transmit the amplified RF signal to the mobile station.
- the antennas 16a and 16b receive uplink RF signals from the mobile station and input them to the amplifiers 15a and 15b.
- the base station 10a includes a plurality of amplifiers that amplify RF signals, a plurality of antennas that transmit RF signals amplified by the plurality of amplifiers, and a plurality of wireless communication units.
- RU RU
- the base station 10a is provided with a plurality of transmission systems, and transmission diversity can be applied.
- the mobile communication system 100 determines the transmission diversity method used for signal transmission from the base station to the mobile station based on the soft handover status of the mobile station. And base stations 10a to 10e that generate a baseband signal according to the determination result by the determination unit 32 and transmit an RF signal obtained by frequency-converting the baseband signal to the mobile station.
- the mobile station 20a includes an interface 21, a baseband signal processing unit 22, a control unit 23, a radio communication unit 24, an amplifier 25, and an antenna 26.
- the mobile stations 20b and 20c have substantially the same configuration as the mobile station 20a.
- the antenna 26 receives a downlink RF signal from the base station and inputs it to the amplifier 25.
- the antenna 26 acquires the uplink RF signal amplified from the amplifier 25 and transmits it to the base station.
- the amplifier 25 acquires the RF signal received from the antenna 26, amplifies it, and inputs it to the wireless communication unit 24.
- the amplifier 25 acquires the RF signal transmitted from the radio communication unit 24, amplifies it, and inputs it to the antenna 26.
- the radio communication unit 24 acquires the RF signal received from the amplifier 25, and converts the frequency into a baseband signal.
- the radio communication unit 24 inputs the converted baseband signal to the baseband signal processing unit 22.
- the radio communication unit 24 receives the RF signal that is diversity-transmitted from the base station through the antenna 26 and the amplifier 25 by applying transmission diversity.
- the wireless communication unit 24 transmits the baseband signal transmitted from the baseband signal processing unit 22. Acquire and convert to RF signal of radio frequency.
- the wireless communication unit 24 inputs the converted RF signal to the amplifier 25.
- the control unit 23 controls the baseband signal processing unit 22 and the wireless communication unit 24.
- the control unit 23 acquires control data including a notification from the radio network controller 30 via the base station and the radio communication unit 24.
- the control unit 23 instructs the wireless communication unit 24 to establish or release a wireless line with the base station based on the notification of establishment or release of the wireless line.
- the control unit 23 instructs the baseband signal processing unit 22 to decode the baseband signal according to the transmission diversity scheme notified.
- the control unit 23 also instructs the baseband signal processing unit 22 when to switch the transmission diversity method.
- control unit 23 determines the relationship between the received power difference of the signals received by the radio communication unit 24 from each base station and the threshold value of the received power difference, and sends the determination result to the radio network controller 30. Notice. Specifically, the control unit 23 notifies the base station that the received power difference exceeds the threshold and the received power is low, or the mobile station receives that the received power difference is less than the received power difference threshold. The base station is notified by transmitting an RF signal.
- control unit 23 monitors the wireless communication unit 24 and detects the received power from each base station.
- the control unit 23 calculates the received power difference from each base station and compares it with the threshold value of the received power difference.
- the control unit 23 generates control data including the notification of the base station having the received power difference exceeding the threshold and the received power being low,
- the generated control data is transmitted to the radio network controller 30 via the radio communication unit 24 and the base station.
- control unit 23 determines that the received power difference has become less than the threshold value and the RF signal received by the mobile station.
- Control data including the base station notification is generated, and the generated control data is transmitted to the radio network controller 30 via the radio communication unit 24 and the base station.
- control unit 23 may notify the radio network control station 30 of the received power difference or the received power itself from each mobile station. In this case, the control unit 23 can notify, for example, periodically or in response to a request from the radio network controller 30. In addition, the control unit 23 performs call control and the like.
- the baseband signal processing unit 22 performs signal processing on the baseband signal.
- the baseband signal processing unit 22 acquires the baseband signal received from the base station on the downlink from the wireless communication unit 24.
- the baseband signal processing unit 22 extracts the acquired baseband signal power user data and control data and inputs them to the interface 21 and the control unit 23. Specifically, the baseband signal processing unit 22 obtains data by performing despreading processing, RAKE combining, decoding, etc. on the baseband signal received on the downlink.
- the baseband signal processing unit 22 acquires user data and control data to be transmitted to the base station via the uplink from the interface 21 and the control unit 23.
- the interface 21 is an interface with an input unit, an output unit, an external device, or the like.
- the baseband signal processing unit 22 generates a baseband signal including the acquired user data and control data.
- the baseband signal processing unit 22 inputs the generated baseband signal to the wireless communication unit 24. Specifically, the baseband signal processing unit 22 generates a baseband signal by performing error correction encoding, spreading processing, and the like of data transmitted on the uplink.
- the baseband signal processing unit 22 decodes the baseband signal obtained by frequency-converting the RF signal
- the baseband signal processing unit 22 decodes the baseband signal in accordance with the transmission diversity method according to the soft handover situation of the mobile station 20a.
- the baseband signal processing unit 22 receives an instruction from the control unit 23 to decode the baseband signal according to the transmission diversity method notified from the radio network controller 30, and decodes the baseband signal according to the instruction.
- the baseband signal processing unit 22 switches the transmission diversity method for decoding the baseband signal in accordance with the instruction.
- the baseband signal processing unit 22 switches the transmission diversity method used for decoding at the instructed timing.
- the mobile station switches the transmission diversity method used for decoding in accordance with the change in the number of base stations with which the mobile station communicates at the same time. Specifically, if the number of base stations to which a mobile station is connected simultaneously becomes one or more, switch to open-loop transmission diversity and perform decoding. Switch to closed-loop transmit diversity for decoding.
- the baseband signal processing unit 22 performs decoding according to open-loop transmission diversity. And a configuration for performing decoding, antenna weight determination, and instruction in accordance with closed-loop transmission diversity.
- the baseband signal processing unit 22 includes an STTD decoder 221 for performing open loop transmission diversity shown in FIG. 5 (a) and a data decoder 222 for performing closed loop transmission diversity shown in FIG. 5 (b). And a weight selection unit 223.
- the signal of the symbol pattern “r, r...” Received by the mobile station 20a from the signal 1 2 2 1 is
- Equation (3) h and a are the propagation paths from the antennas 16a and 16b to the mobile station.
- the baseband signal processing unit 22 despreads the received baseband signal and performs RAKE synthesis.
- a signal after RAKE combining is input to the STTD decoder 221.
- the STTD decoder 221 decodes the acquired signal using the following equation (4). Specifically, the STTD decoder 221 calculates the maximum ratio of the fading vectors a and a for each of the symbols S and S.
- the mobile station 20a has a plurality of antennas.
- the data decoder 222 receives the RAKE combined signal.
- the mobile station 20a received the signals of the symbol patterns “W S” and “W S” transmitted from the antennas 16a and 16b of the base station.
- the signal r is expressed by the above equation (2).
- the data decoder 222 performs decoding using the following equation (5). Specifically, The data decoder 222 performs signal synthesis by calculating Equation (5), and obtains a gain (beam forming gain) for matching the phases. For simplicity, the noise component is ignored in Equation (5).
- the weight selection unit 223 determines an antenna weight to be notified to the base station and generates an FBI. Based on the received signal, the weight selection unit 223 determines the antenna weight so that the amplitude and phase of the transmission signals from the antennas 16a and 16b become an optimum pattern (so that a high gain can be obtained by signal synthesis). Specifically, the weight selection unit 223 uses a W + a W
- W is determined so that 1 1 2 2 is maximized.
- the weight selector 223 sets the positive and negative of the I-axis component of W to odd numbers.
- the positive / negative sign of the Q-axis component of W is changed to the FBI bit of the even time slot in the FBI bit of the time slot.
- the FBI generated by the weight selection unit 223 is transmitted to the base station by the radio communication unit 24.
- the baseband signal processing unit 22 may determine an antenna weight actually used by the base station, that is, so-called antenna verification, because an error may occur in the FBI during transmission on the uplink. Do Chillon.
- the baseband signal processing unit 22 uses the FBI error rate (BER: Bit Error Rate) predicted value (prior probability) and the pilot signal received signal included in the dedicated channel to determine the error rate (posterior probability). Perform antenna verification using at least one of the above.
- the data decoder 222 can decode the data with high accuracy using the determination result of the antenna verification. Therefore, the mobile station 20a can prevent the quality from deteriorating due to a difference between the antenna weight adopted by the base station and the antenna weight assumed by the mobile station 20a.
- the baseband signal processing unit 22 outputs the data decoded in this way to the output unit or the like via the interface 21.
- the thick line arrows indicate the state where a wireless channel (communication channel) is established
- the thin line arrows indicate notifications and instructions.
- the received power 101 of the RF signal received by the mobile station 20a from the base station 10a is increased, and the received power of the RF signal received from the base station 10b is increased.
- 102 becomes lower, and the received power difference between received power 101 and received power 102 is received. Processing when the power difference threshold Th is exceeded will be described.
- the mobile station 20a establishes a radio channel with the base station 10a (S101) and establishes a radio channel with the base station 10b (S103), and performs soft handover.
- Each of the base station 10a and the base station 10b has established a channel with the radio network controller 30 (S102, S104).
- the base stations 10a and 10b transmit signals to the mobile station 20a using open loop transmission diversity.
- the mobile station 20a receives the common pilot channel received power 101 from the base station 10a and the common pilot channel received power 102 from the base station 10b at time tl. If the difference exceeds the threshold value Th of the received power difference, the radio network controller 30 is notified that the received power difference has exceeded the threshold value Th and the base station 10b having a low received power (S105).
- the radio network controller 30 determines to stop soft handover based on the notification from the mobile station 20a. Then, the radio network controller 30 determines release of radio channels between the base station 10b and the mobile station 20a with low received power. As a result, the soft handover status is changed to a state in which soft handover is not in progress, so that the radio network controller 30 determines the transmission diversity method used for signal transmission to the mobile station 20a as closed loop transmission diversity (S 106).
- the radio network controller 30 instructs the base station 10b to release the radio network (S107). As a result, after the time tl, the radio link between the mobile station 20a and the base station 10b is released and communication is stopped. Further, the radio network controller 30 instructs the base station 10a together with the switching timing to switch the transmission diversity method used for signal transmission to the mobile station 20a to closed loop transmission diversity (S108). In addition, the radio network controller 30 notifies the mobile station 20a of the radio channel release and transmission diversity scheme with the base station 10b and switching to the closed loop transmission diversity and the switching timing (S109).
- the mobile station 20a and the base station 10a switch the transmission diversity method to be used to closed loop transmission diversity at the instructed switching timing while maintaining the establishment of the radio channel (S110, Slll).
- the received power 102 of the RF signal received by the mobile station 20a from the base station 10b is increased, and the received power 101 and received power 102 are increased.
- Received power Processing when the difference is equal to or less than the threshold value Th of the received power difference will be described.
- the mobile station 20a has established a radio link with only the base station 10a (S201).
- the base station 10a has established a line with the radio network controller 30 (S202).
- the base station 10a transmits signals to the mobile station 20a using closed loop transmission diversity.
- the mobile station 20a receives the common pilot channel received power 101 from the base station 10a and the common pilot channel received power 102 from the base station 10b at time t2. Is within the threshold Th of the received power difference, the RF signal received by the mobile station 20a is transmitted to the radio network controller 30 and the RF signal received by the mobile station 20a is transmitted to the radio network controller 30. A plurality of base stations 10a and 10b are notified (S203).
- the radio network controller 30 determines to start soft handover based on the notification from the mobile station 20a. Then, the radio network controller 30 determines to newly establish a radio channel between the base station 10b that transmits the RF signal received by the mobile station 20a and the mobile station 20a. As a result, the status of soft handover is changed from a state where soft handover is not in progress to during soft handover. For this reason, the radio network controller 30 determines that the transmission diversity method used for signal transmission to the mobile station 2 Oa is open-loop transmission diversity (S204).
- the radio network controller 30 instructs the base station 10b to establish a radio channel and open-loop transmission diversity as a transmission diversity method to be used (S205). Thereby, after time t2, a radio channel is established between the mobile station 20a and the base station 10b, and communication is started.
- the radio network controller 30 instructs the base station 10a together with the switching timing to switch the transmission diversity method used for signal transmission to the mobile station 20a to open-loop transmission diversity. (S206).
- the radio network controller 30 notifies the mobile station 20a of radio channel establishment with the base station 10b and switching the transmission diversity method to open loop transmission diversity and the switching timing (S207).
- the mobile station 20a and the base station 10a switch the transmission diversity method to be used to open-loop transmission diversity at the designated switching timing while maintaining the establishment of the radio channel (S208, S209). Further, the mobile station 20a and the base station 10b establish a radio channel (S210), and the base station 10b and the radio channel controller 30 establish a channel (S211). Base station 10b Signal transmission is performed using open loop transmission diversity.
- the radio network controller 30 can transfer software to the base stations 10a to 10e.
- the RF signal can be transmitted using the optimal transmission diversity method.
- Base stations 10a to 10e: 10e can transmit an RF signal to the mobile stations 20a to 20c by using an optimal transmission diversity method according to the soft handover situation.
- the mobile stations 20a to 20c can decode the baseband signal by an appropriate method that matches the transmission diversity scheme when the transmission diversity scheme is changed according to the soft handover situation.
- transmission diversity schemes such as open-loop transmission diversity and closed-loop transmission diversity can be appropriately used, and reception quality at the mobile stations 20a to 20c can be improved. As a result, power S can be increased.
- the radio network controller 30 can cause the base stations 10a to 10e to use open-loop transmission diversity during soft handover.
- application of closed-loop transmission diversity may cause degradation of reception quality due to various degradation factors such as degradation of reception quality of FBI that indicates antenna weight as described above.
- the radio network controller 30 can prevent such deterioration in reception quality.
- the radio network controller 30 can cause the base stations 10a to 10e to use closed-loop transmission diversity when the soft handover is not in progress.
- closed-loop transmission diversity using FBI for generating antenna weights transmitted from mobile stations 20a to 20c provides a larger gain than open-loop transmission diversity. Therefore, when soft handover is not performed, reception quality in the mobile stations 20a to 20c can be improved by using closed loop transmission diversity. Therefore, the mobile communication system 100 can appropriately switch between open-loop transmission diversity and closed-loop transmission diversity according to the soft handover situation.
- beam beam by closed-loop transmission diversity is used. While obtaining the forming gain, stable communication is possible using open-loop transmission diversity during soft handover. That is, in the mobile communication system 100, it is possible to prevent the downlink capacity deterioration due to the FBI reception quality deterioration in the base station during the soft handover while obtaining the effect of increasing the radio capacity due to the closed loop transmission diversity.
- 3GPP 3rd Generation Partnership Project
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- the determination unit 32 of the radio network controller 30 shown in Fig. 2 determines the transmission diversity scheme to be used by the mobile station and a plurality of base stations. In the case of soft handover between base stations establishing a wireless link, open loop transmission diversity can be determined. On the other hand, when the mobile station is in soft handover within the base station where the mobile station establishes a plurality of radio channels with the same base station or the mobile station is not in soft handover, the determination unit 32 determines the transmission diversity method to be used as a closed loop transmission It can be decided by Versity.
- Intra-base station soft handover is performed when a mobile station exists in a position where different sectors of the same cell overlap.
- the control units 23 and 3 of the mobile stations 20a to 20c shown in FIG. 8 are configured when the received power difference received from the radio communication unit covering different sectors exceeds the received power difference threshold, Notification is given when the threshold value is reached. At this time, the control unit 23 notifies the base station that is transmitting the RF signal received by the mobile station.
- the determination unit 32 determines that the soft handover is stopped when the received power difference exceeds the threshold of the received power difference. Then, the determination unit 32 determines release of the radio channel between the radio communication unit covering the sector with low received power and the mobile station 20a. Furthermore, the decision unit 32 changes the transmission diversity method to be used to the closed-loop transmission type because the soft handover status is changed to a state that is not during the soft handover. Decide on Bersch.
- the determination unit 32 determines to start soft handover when the received power difference is equal to or smaller than the threshold.
- the decision unit 32 decides establishment of a radio link between the mobile station and the radio communication unit that covers the sector to which the RF signal received by the mobile station is transmitted.
- the determination unit 32 determines whether the base stations covering the sector to which the RF signal received by the mobile station is transmitted are the same base station or different base stations.
- the decision unit 32 decides to use closed-loop transmission diversity because soft handover is performed within the base station in the case of the same base station.
- the decision unit 32 decides to use open-loop transmission diversity because it is a soft handover between base stations in the case of different base stations.
- the determination unit 32 can switch the transmission diversity system in accordance with the change in the number of base stations with which the mobile station communicates at the same time. Specifically, the decision unit 32 switches to open-loop transmission diversity when the number of base stations to which a mobile station connects simultaneously is changed from one to multiple, and when the number is changed from plural to one Can switch to closed-loop transmit diversity. Except for these points, the radio control station can perform processing in the same manner as in the above embodiment.
- the base station includes the radio communication unit, amplifier, and antenna shown in Fig. 4 for each sector so as to cover a plurality of sectors. Furthermore, there are multiple radio communication units, amplifiers, and antennas for each sector so that transmission diversity is possible for each sector.
- the baseband signal processing unit 12 can perform the same processing as the baseband signal processing unit 12 shown in FIG. 4 except for generating a baseband signal for each sector.
- the radio network controller 30 allows the base station to perform soft handover between base stations that is highly likely to receive quality degradation due to the application of closed-loop transmission diversity. Open-loop transmission diversity can be used, and reception quality degradation can be prevented. In addition, the radio network controller 30 closes the closed loop transmission diversity when the base station is not performing soft handover or soft handover within the base station, where the possibility of reception quality degradation due to the application of closed loop transmission diversity is relatively low. The reception quality at the mobile station using the FBI from the mobile station Can be improved.
- the determination unit 32 is provided with the force S provided in the radio network controller 30, and the place where the determination unit is provided is not limited. Moyore.
- the control unit 23 of the mobile stations 20a to 20c may function as a determination unit that determines the transmission diversity method used by the base station for signal transmission based on the soft handover situation.
- the control unit 23 can detect the establishment status of the radio line of the radio communication unit 24 and determine the soft handover status.
- the control unit 23 can also function as an instruction unit for instructing the transmission diversity system to the base station based on the determination result.
- the control unit 23 can generate control data including an instruction and transmit it to the base station in the same manner as the instruction / notification unit 33 shown in FIG.
- the baseband signal processing unit 22 can decode the baseband signal based on the determination result by the control unit 23.
- the mobile stations 20a to 20c can determine the optimum transmission diversity scheme that the base station wants to use, and cause the base station to transmit an RF signal using it.
- load distribution within the mobile communication system can be achieved.
Abstract
Description
Claims
Priority Applications (3)
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CN2005800429660A CN101080939B (zh) | 2004-12-14 | 2005-12-13 | 无线线路控制站、基站、移动站、移动通信系统以及移动通信方法 |
US11/721,774 US8615245B2 (en) | 2004-12-14 | 2005-12-13 | Radio network controller, base station, mobile station, mobile communication system and mobile communication method |
EP05816724A EP1833268A4 (en) | 2004-12-14 | 2005-12-13 | CONTROL STATION FOR A WIRELESS LINE, BASE STATION, MOBILE STATION, MOBILE COMMUNICATION SYSTEM AND MOBILE COMMUNICATION PROCESS |
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JP2004-361896 | 2004-12-14 | ||
JP2004361896A JP4785377B2 (ja) | 2004-12-14 | 2004-12-14 | 無線回線制御局、移動通信システム及び移動通信方法 |
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PCT/JP2005/022882 WO2006064806A1 (ja) | 2004-12-14 | 2005-12-13 | 無線回線制御局、基地局、移動局、移動通信システム及び移動通信方法 |
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US (1) | US8615245B2 (ja) |
EP (1) | EP1833268A4 (ja) |
JP (1) | JP4785377B2 (ja) |
CN (1) | CN101080939B (ja) |
WO (1) | WO2006064806A1 (ja) |
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CN101330305B (zh) * | 2007-06-21 | 2012-05-09 | 株式会社Ntt都科摩 | 移动站以及移动站中的发送功率控制方法 |
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JP4675965B2 (ja) | 2005-09-26 | 2011-04-27 | シャープ株式会社 | 基地局装置、それに用いられる方法、および無線通信システム |
JP2008103865A (ja) * | 2006-10-18 | 2008-05-01 | Nec Corp | ハンドオーバ制御システム及びその方法並びにそれを用いた移動通信システム及び無線基地局 |
JP4634362B2 (ja) * | 2006-12-11 | 2011-02-16 | 株式会社エヌ・ティ・ティ・ドコモ | 移動体通信システム、移動体通信システムにおける移動端末、その制御プログラムおよび移動体通信システムにおける同期確立判定方法 |
CN101741440B (zh) * | 2008-11-27 | 2015-09-02 | 三星电子株式会社 | Geran/muros系统中的分集指示方法 |
CN101599785B (zh) * | 2009-06-25 | 2013-01-02 | 北京邮电大学 | 一种多小区联合传输方法 |
WO2011090420A1 (en) * | 2010-01-20 | 2011-07-28 | Telefonaktiebolaget L M Ericsson (Publ) | Methods and devices for uplink transmit diversity |
JP5585306B2 (ja) * | 2010-08-25 | 2014-09-10 | ソニー株式会社 | 基地局、無線通信装置、無線通信システム、無線通信方法およびプログラム |
WO2012102652A1 (en) * | 2011-01-26 | 2012-08-02 | Telefonaktiebolaget L M Ericsson (Publ) | Methods and arrangements for transmit mode adaptation |
EP2509364B1 (en) * | 2011-04-08 | 2013-12-11 | Alcatel Lucent | Transmission method and mobile station to carry out the method |
EP2742610B1 (en) * | 2011-09-26 | 2016-08-10 | Telefonaktiebolaget LM Ericsson (publ) | Radio network controller and method therein |
US8831613B2 (en) | 2011-09-26 | 2014-09-09 | Telefonaktiebolaget L M Ericsson (Publ) | Radio base station; radio network controller and methods therein |
US20140133319A1 (en) * | 2012-11-13 | 2014-05-15 | Qualcom Incorporated | Receive diversity control in td-scdma |
CN104782058A (zh) * | 2012-10-19 | 2015-07-15 | 高通股份有限公司 | Td-scdma中的接收分集控制 |
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JP2006173924A (ja) | 2006-06-29 |
CN101080939B (zh) | 2012-08-15 |
US20100048214A1 (en) | 2010-02-25 |
CN101080939A (zh) | 2007-11-28 |
EP1833268A4 (en) | 2012-08-01 |
US8615245B2 (en) | 2013-12-24 |
EP1833268A1 (en) | 2007-09-12 |
JP4785377B2 (ja) | 2011-10-05 |
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