WO2008013254A1 - Dispositif de communication radio et procede de communication radio - Google Patents
Dispositif de communication radio et procede de communication radio Download PDFInfo
- Publication number
- WO2008013254A1 WO2008013254A1 PCT/JP2007/064742 JP2007064742W WO2008013254A1 WO 2008013254 A1 WO2008013254 A1 WO 2008013254A1 JP 2007064742 W JP2007064742 W JP 2007064742W WO 2008013254 A1 WO2008013254 A1 WO 2008013254A1
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- WO
- WIPO (PCT)
- Prior art keywords
- symbol sequence
- configuration
- symbol
- sequence configuration
- axis direction
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0026—Division using four or more dimensions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0078—Timing of allocation
- H04L5/0085—Timing of allocation when channel conditions change
Definitions
- the present invention relates to a radio communication apparatus and radio communication method for transmitting and receiving a radio signal including a symbol sequence having a predetermined size in the frequency axis direction and the time axis direction using an orthogonal frequency division multiplexing system.
- adaptive array control based on "known information" included in a radio signal received from a communication destination (for example, a mobile station), it is used for beam forming of a radio signal transmitted to the communication destination.
- the array weight is calculated.
- a symbol string in which a plurality of symbols are arranged in the time axis direction and the frequency axis direction (subcarrier direction) is used.
- the symbol sequence is generally composed of preamble symbols used for symbol synchronization and array weight calculation, and data symbols used for transmission of user data.
- Patent Document 1 JP 2002-185375 A (Pages 6-7, Fig. 2)
- the present invention has been made in view of such a situation, and a desired antenna combined gain can be obtained regardless of the reception state of a radio signal while suppressing a decrease in transmission efficiency of data symbols. It is an object of the present invention to provide a wireless communication apparatus and a wireless communication method capable of executing adaptive array control.
- the present invention has the following features.
- the first feature of the present invention is that an orthogonal frequency division multiplexing system is used, and a predetermined size (for example, 2 ⁇ 2) is used in the frequency axis direction (frequency axis direction D) and the time axis direction (time axis direction D). Configuration)
- Radio signal including a symbol string to be transmitted (for example, symbol string S).
- a radio signal (downlink radio signal RS) received from the destination (wireless communication terminal 200) and transmitted to the destination based on the symbol sequence included in the received radio signal!
- Control apparatus (radio base station 100) that receives the radio signal.
- a reception state determination unit for determining a reception state (for example, reception SNR), and the frequency axis direction and the time axis direction based on the reception state determined by the reception state determination unit.
- the gist of the present invention is to include a symbol column configuration changing unit (symbol column configuration changing unit 109) that changes a symbol column configuration (for example, 2 ⁇ 4 configuration) of the symbol sequence determined by the size.
- the size depends on the size of the frequency axis direction and the time axis direction based on the reception state of the radio signal according to the orthogonal frequency division multiplexing (OFDM) system. Therefore, the symbol string configuration is appropriately changed.
- OFDM orthogonal frequency division multiplexing
- a symbol string configuration having a large size in the frequency axis direction can be used.
- a symbol string configuration having a large size in the time axis direction can be used.
- a second feature of the present invention relates to the first feature of the present invention, and is a symbol configuration notification unit (symbol) that notifies the communication destination of the symbol column configuration changed by the symbol column configuration change unit.
- the gist is to further include a column configuration notifying unit 111).
- a third feature of the present invention relates to the first or second feature of the present invention.
- the symbol sequence configuration a reference symbol sequence configuration (4 X 2 configuration) and a reference symbol sequence configuration are used. And a small-band symbol string configuration (2 ⁇ 2 configuration) in the frequency axis direction, and the symbol string configuration changing unit has the reception state satisfying a predetermined condition by the reception state determining unit.
- the gist is that the configuration is changed to the narrow-band symbol sequence configuration instead of the reference symbol sequence configuration.
- a fourth feature of the present invention relates to the first or second feature of the present invention, wherein the symbol array structure is provided.
- the symbol sequence configuration includes a reference symbol sequence configuration (4 X 2 configuration), a size larger in the frequency axis direction than the reference symbol sequence configuration, and a wideband symbol sequence configuration (8 X 1 configuration).
- the gist of the present invention is that, when the reception state determining unit determines that the reception state satisfies a predetermined condition, the changing unit changes to the wideband symbol sequence configuration instead of the reference symbol sequence configuration. .
- a fifth feature of the present invention relates to the first to third features of the present invention.
- As the symbol column configuration a reference symbol column configuration (4 X 2 configuration) and a reference symbol column configuration are provided. The size in the frequency axis direction is small!
- a symbol band configuration (2 ⁇ 4 configuration) and the symbol sequence configuration change unit, when the reception status determination unit determines that the reception status does not satisfy a predetermined condition, the reference symbol
- the first narrowband symbol sequence configuration is changed to the first narrowband symbol sequence configuration, and it is determined that the reception state does not satisfy a predetermined condition even in the first narrowband symbol sequence configuration.
- the second narrowband symbol string configuration And summarized in that to change the frequency symbol string configuration.
- a sixth feature of the present invention relates to the third feature of the present invention, wherein the radio communication device receives a radio signal including the symbol sequence and includes the symbol included in the received radio signal. Based on the sequence! /, To perform adaptive array control of the radio signal transmitted to the communication destination, the symbol sequence is a preamble symbol (preamble symbol P) used for array weight calculation
- the symbol sequence configuration changing unit changes the symbol sequence configuration to the symbol sequence configuration including the same number of preamble symbols in the reference symbol sequence configuration and the narrowband symbol sequence configuration.
- a seventh feature of the present invention relates to the fourth feature of the present invention, wherein the radio communication device receives a radio signal including the symbol sequence and includes the symbol included in the received radio signal. Based on the sequence! /, To perform adaptive array control of the radio signal transmitted to the communication destination, the symbol sequence is a preamble symbol (preamble symbol P) used for array weight calculation And the symbol sequence configuration changing unit includes the same number of profiles in the reference symbol sequence configuration and the wideband symbol sequence configuration. The gist is to change to a symbol string configuration including a rumble symbol.
- An eighth feature of the present invention relates to the first to seventh features of the present invention, wherein the symbol sequence includes: the symbol sequence configuration changing unit is configured to operate in the frequency axis direction and the time axis direction.
- the gist of the invention is to change the symbol string configuration of the preamble symbol determined by the size.
- a ninth feature of the present invention is that an orthogonal frequency division multiplexing system is used, and a radio signal including a symbol string having a predetermined size in the frequency axis direction and the time axis direction is received from a communication destination and received.
- a tenth feature of the present invention according to the ninth feature of the present invention is the step of notifying the communication destination of the symbol string configuration changed in the step of changing the symbol string configuration.
- the gist is to provide.
- An eleventh feature of the present invention relates to the ninth or tenth feature of the present invention, wherein the symbol string configuration is a reference symbol string configuration, and is more in the frequency axis direction than the reference symbol string configuration.
- the reference symbol string configuration is replaced. The gist is to change to the narrow-band symbol string configuration.
- a twelfth feature of the present invention relates to the ninth or tenth feature of the present invention, wherein as the symbol column configuration, a reference symbol column configuration, and more in the frequency axis direction than the reference symbol column configuration.
- the size is replaced with the reference symbol sequence configuration.
- the gist of the present invention is to change to the wideband symbol string configuration.
- a thirteenth feature of the present invention relates to the eleventh feature of the present invention, wherein the symbol string includes a preamble symbol used for calculating an array weight, and the step of changing the symbol string configuration includes:
- the gist of the invention is that the reference symbol sequence configuration and the narrowband symbol sequence configuration are changed to a symbol sequence configuration including the same number of preamble symbols.
- a fourteenth feature of the present invention relates to the twelfth feature of the present invention, wherein the symbol sequence includes a preamble symbol used for array weight calculation, and the step of changing the symbol sequence configuration includes:
- the gist of the present invention is that the reference symbol sequence configuration and the wideband symbol sequence configuration are changed to a symbol sequence configuration including the same number of preamble symbols.
- a fifteenth feature of the present invention relates to the ninth to fourteenth features of the present invention, wherein the symbol sequence includes a preamble symbol used for array weight calculation, and the symbol sequence configuration is changed.
- the gist of the present invention is to change the symbol string configuration of the preamble symbol determined by the size in the frequency axis direction and the time axis direction.
- a wireless communication device and a wireless communication method that can be provided are provided.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system according to an embodiment of the present invention.
- FIG. 2 is a functional block configuration diagram of a radio communication apparatus (radio base station) according to the embodiment of the present invention.
- FIG. 3 is a functional block configuration diagram of a wireless communication device (wireless communication terminal) according to the embodiment of the present invention.
- FIG. 4 is an operation flowchart of the radio communication apparatus (radio base station) according to the embodiment of the present invention.
- FIG. 5 is an operation flow of the wireless communication apparatus (wireless communication terminal) according to the embodiment of the present invention.
- FIG. 6 is a diagram showing an example of a symbol string according to the embodiment of the present invention.
- FIG. 7 is a diagram showing an example of a symbol string according to the embodiment of the present invention.
- FIG. 8 is a diagram showing an example of a symbol string according to the embodiment of the present invention.
- FIG. 9 is a diagram showing an example of a symbol string according to the embodiment of the present invention.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system according to the present embodiment.
- the radio communication system according to this embodiment includes a radio base station 100 and a radio communication terminal 200. Note that the number of radio base stations and radio communication terminals is not limited to the number shown in FIG.
- Radio base station 100 and radio communication terminal 200 use an orthogonal frequency division multiplexing (OFDM) method.
- the wireless base station 100 and the wireless communication terminal 200 are connected to a non-communication device (i.e., a predetermined number of subcarriers according to WiMAX worldwide interoperability for microwave access).
- Orthogonal frequency division multiple access (OFDMA) is used.
- the radio base station 100 is included in the uplink radio signal RS received from the radio communication terminal 200.
- adaptive array control of the downlink radio signal RS transmitted to the radio communication terminal 200 (communication destination) is executed.
- the wireless communication terminal 200 is a card-type wireless communication terminal, and is attached to a laptop personal computer, a PDA (not shown), or the like. [0038] (Function block configuration)
- the radio base station 100 and the radio communication terminal 200 may include a logic block (such as a power supply unit) that is not shown in the drawing or that is not necessary for realizing the function as the device. Please note that.
- a logic block such as a power supply unit
- FIG. 2 is a functional block configuration diagram of the radio base station 100.
- the radio base station 100 includes a radio communication unit 101, an array control unit 103, a radio signal processing unit 105, a reception status determination unit 107, a symbol sequence configuration change unit 109, and a symbol sequence configuration notification unit 111. And a baseband processing unit 113.
- Radio communication section 101 transmits and receives radio signals according to the OFDM scheme.
- FIG. 6 is included in the uplink radio signal RS received by the radio communication unit 101 from the radio communication terminal 200.
- the symbol sequence S is located in the frequency axis direction D and the time axis direction D.
- the symbol sequence S is composed of a preamble symbol P and a data symbol D.
- Data symbol D includes a predetermined number of pilot symbols PL.
- the frequency axis direction D is defined by the number of subcarriers, that is, the bandwidth.
- nine carriers in the figure, one row is displayed as one carrier
- the time axis direction D is regulated by the number of OFDMA symbols.
- the data symbol D has 18 carriers in the frequency axis direction D, that is, 2b.
- a plurality of data symbols D can be arranged along the frequency axis direction D.
- the preamble symbol P has 18 carriers in the frequency axis direction D.
- the basic size is 2 bins and 2 symbols (2 X 2 configuration) in the time axis direction D.
- the symbol string structure is based on the structure of the preamble symbol P. Is identified. That is, the symbol string S is c symbol P that 2 X 2 configuration to be expressed is used in the calculation of the array weight.
- the control unit 103 controls the downlink radio signal RS to be transmitted to the radio communication terminal 200 based on the symbol sequence S included in the uplink radio signal RS received from the radio communication terminal 200.
- array control section 103 calculates an array weight applied to downlink radio signal RS based on preamble symbol P (see FIG. 6).
- array controller 1 calculates an array weight applied to downlink radio signal RS based on preamble symbol P (see FIG. 6).
- the radio signal processing unit 105 is a downlink radio signal RS transmitted by the radio communication unit 101.
- the radio signal processing unit 105 is a serial signal included in the downlink radio signal RS.
- the symbol string structure of the symbol string S can be changed.
- Reception state determination section 107 receives reception status of uplink radio signal RS received by radio communication section 101.
- the reception state determination unit 107 performs signal pairing of the uplink radio signal RS.
- the reception state determination unit 107 performs uplink radio signal reception.
- the transmission power, phase, time (transmission cycle), etc. of the uplink radio signal RS are adjusted so that the reception SNR is maximized.
- the target SNR is set with the received SNR required as a control evaluation value according to the modulation scheme used, and the uplink radio is maintained so as to maintain the target SNR. Control of signal RS is executed.
- Symbol sequence configuration changing section 109 changes the symbol sequence configuration of symbol ⁇ l] S based on the reception status determined by reception status determination section 107.
- the 4 X 2 configuration shown in FIG. 7 the 2 X 4 configuration shown in FIG. 8, and the 8 X 1 configuration shown in FIG. 9 are used. be able to.
- the 4 ⁇ 2 configuration shown in FIG. 7 is referred to as a reference symbol string configuration.
- the 2 ⁇ 2 configuration shown in FIG. 6 and the 2 ⁇ 4 configuration shown in FIG. 8 are referred to as a narrowband symbol sequence configuration in which the size in the frequency axis direction D is smaller than the reference symbol sequence configuration.
- Figure 9 Also shown in Figure 9
- symbol sequence configuration changing section 109 changes the symbol sequence configuration of entire symbol sequence S based on the symbol sequence configuration (for example, 4 ⁇ 2 configuration) of preamble symbol P.
- Symbol sequence reconfiguration section 109 receives uplink radio signal RS that satisfies a predetermined condition.
- the narrowband is used instead of the reference symbol string configuration (4 ⁇ 2 configuration). Change to symbol array configuration (2 X 2 configuration).
- the symbol sequence configuration changing unit 109 when the received SNR measured by the reception state determining unit 107 falls below a predetermined threshold, the symbol sequence configuration changing unit 109 does not use the 2 X 2 configuration (first narrowband symbol sequence configuration). It is also possible to change to a 2 ⁇ 4 configuration (second narrowband symbol sequence configuration). That is, symbol sequence configuration changing section 109 can change the reference symbol sequence configuration and the narrowband symbol sequence configuration to V and a symbol sequence configuration including the same number of preamble symbols.
- symbol sequence configuration changing section 109 replaces the reference symbol sequence configuration (4 X 2 configuration) with a wideband symbol sequence when the received SNR measured by reception status determining section 107 exceeds a predetermined threshold value. Change to configuration (8 X 1 configuration). That is, the symbol string configuration changing unit 109 can change the symbol string configuration including the same number of preamble symbols in the reference symbol string configuration and the wideband symbol string configuration.
- Symbol sequence configuration notifying section 111 notifies radio communication terminal 200 of the symbol sequence configuration changed by symbol sequence configuration changing section 109. Specifically, symbol sequence configuration notifying section 111 sends symbol sequence configuration notification indicating the symbol sequence configuration changed by symbol sequence configuration changing section 109 to radio communication terminal 200. The symbol string configuration notification is included in the downlink radio signal RS and transmitted to the radio communication terminal 200.
- Baseband processing section 113 is connected to radio signal processing section 105.
- the baseband processing unit 113 performs radio signal processing on baseband signals such as user data and control data. Send to part 105.
- Baseband processing section 113 demodulates the radio signal received from radio signal processing section 105 into a baseband signal.
- FIG. 3 is a functional block configuration diagram of the radio communication terminal 200.
- radio communication terminal 200 includes radio communication section 201, radio signal processing section 203, symbol sequence configuration receiving section 205, symbol sequence configuration changing section 207, and baseband processing section 209.
- description of functional blocks that perform the same processing as that of the above-described radio base station 100 will be omitted as appropriate.
- the wireless communication unit 201 performs substantially the same processing as the wireless communication unit 101.
- the wireless signal processing unit 203 performs substantially the same processing as the wireless signal processing unit 105.
- Symbol sequence configuration reception section 205 receives a symbol sequence configuration notification transmitted by radio base station 100. Based on the received symbol sequence configuration notification, symbol sequence configuration receiving section 205 symbolizes the symbol sequence configuration of symbol sequence S included in uplink radio signal RS.
- the column configuration change unit 207 is notified.
- Symbol sequence configuration changing section 207 based on the symbol sequence configuration notified by symbol sequence configuration receiving section 205, is a symbol sequence of symbol ⁇ IJS included in uplink radio signal RS.
- the baseband processing unit 209 performs substantially the same processing as the baseband processing unit 113.
- the radio base station 100 determines the symbol ⁇ l] S symbol based on the reception status of the uplink radio signal RS
- FIG. 4 is an operation flowchart of radio base station 100. As shown in Figure 4, step S1 0, the radio base station 100 receives the uplink radio signal RS received from the radio communication terminal 200.
- the radio base station 100 is included in the uplink radio signal RS.
- radio base station 100 determines whether or not the estimated received SNR satisfies a predetermined condition. Specifically, radio base station 100 determines whether the estimated received SNR is smaller than threshold value / 3, greater than or equal to threshold value ⁇ , or greater than threshold value / 3 and smaller than threshold value ⁇ . .
- step S30A the radio base station 100 is included in the uplink radio signal RS
- the radio base station 100 is included in the uplink radio signal RS in step S30B.
- radio base station 100 determines that uplink radio signal RS Change to 2 X 2 configuration as the symbol sequence configuration of symbols ⁇ IJS included in.
- radio base station 100 stores the symbol string configuration changed in any one of steps S30A to S30C.
- radio base station 100 transmits a symbol sequence configuration notification indicating the changed symbol sequence configuration to the communication destination, that is, radio communication terminal 200.
- the 4 X 2 configuration reference symbol column configuration
- the 2 X 2 configuration size X in the frequency axis direction D smaller than the 4 X 2 configuration
- Narrow-band symbol sequence configuration Narrow-band symbol sequence configuration
- 2 X 4 configuration with a size in the time axis direction D larger than the 2 X 2 configuration
- Radio base station 100 specifically symbol sequence configuration changing section 109, has determined that reception status of uplink radio signal RS does not satisfy a predetermined condition by reception status determination section 107
- radio base station 100 is included in uplink radio signal RS.
- radio base station 100 uses, as a threshold value, a reception SNR that is better than threshold value ⁇ used for whether to change to the 4 ⁇ 2 configuration as a condition for changing to the 8 ⁇ I configuration.
- FIG. 5 is an operation flowchart of the radio communication terminal 200. As shown in FIG. 5, in step S 110, radio communication terminal 200 determines whether or not a symbol sequence configuration notification has been received from radio base station 100 in communication.
- radio communication terminal 200 includes in uplink radio signal RS based on the received symbol sequence configuration notification in step SI20.
- Symbol ⁇ ⁇ Set the IJS symbol string configuration.
- radio communication terminal 200 transmits uplink radio signal RS including symbol sequence S having the set symbol sequence configuration to radio base station 100.
- the data symbol D is 18 keys in the frequency axis direction D.
- the basic size is 3 symbols in the rear (2bin) and time axis direction D. That is, the data
- the basic size of symbol D in frequency axis direction D and time axis direction D is fixed.
- the reception SNR of the uplink radio signal RS is good (for example, the reception SN
- a symbol string configuration having a large size in the frequency axis direction D of the symbol string S (for example, 4
- the preamble symbol P required to obtain the antenna combined gain close to the theoretical value by adaptive array control is changed in the frequency axis direction D.
- the number of Vol P is reduced and the transmission efficiency of data symbol D is improved. Furthermore, the time axis Direction D is reduced in size to reduce the effects of multipath fading
- reception SNR of the uplink radio signal RS is bad (for example, when the reception SNR ⁇
- the preamble symbol P necessary to obtain the antenna combined gain is obtained while approaching the theoretical value by adaptive array control while avoiding the effect of frequency selective fading! Can be arranged.
- the size in the frequency axis direction D and the time axis direction D of the preamble symbol P portion as the symbol string configuration is set to the reception state of the uplink radio signal RS.
- the reception SNR is set as the reception state of the uplink radio signal RS.
- the uplink radio signal RS As the reception state of the uplink radio signal RS, the uplink radio signal RS
- the received power value, timing jitter, or frequency offset amount may be used.
- the wireless communication terminal 200 is a card-type wireless communication terminal.
- the wireless communication terminal 200 may be in a form other than the card type, for example, a mobile phone terminal.
- radio communication terminal 200 receives the symbol sequence S included in uplink radio signal RS based on the symbol sequence configuration notification received from radio base station 100.
- the radio communication terminal 200 estimates the state of the uplink radio signal RS based on the reception state of the downlink radio signal R S, and the uplink radio signal R
- the wireless communication apparatus and the wireless communication method according to the present invention can obtain a desired antenna combined gain regardless of the reception state of a wireless signal while suppressing a decrease in the transmission efficiency of data symphonies. Therefore, it is useful in wireless communication such as mobile communication.
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- Mobile Radio Communication Systems (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07791436.4A EP2048805A4 (en) | 2006-07-28 | 2007-07-27 | RADIO COMMUNICATION DEVICE AND RADIO COMMUNICATION METHOD |
US12/375,519 US20110310989A1 (en) | 2006-07-28 | 2007-07-27 | Radio Communication Device and Radio Communication Method |
KR1020097001955A KR101058633B1 (ko) | 2006-07-28 | 2007-07-27 | 무선 통신 장치 및 무선 통신 방법 |
US13/898,257 US20130250794A1 (en) | 2006-07-28 | 2013-05-20 | Radio Communication Device and Radio Communication Method |
US14/157,995 US8982684B2 (en) | 2006-07-28 | 2014-01-17 | Radio communication device and radio communication method |
US14/593,942 US9166752B2 (en) | 2006-07-28 | 2015-01-09 | Radio communication device and radio communication method |
Applications Claiming Priority (2)
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JP2006207240A JP2008035285A (ja) | 2006-07-28 | 2006-07-28 | 無線通信装置及び無線通信方法 |
JP2006-207240 | 2006-07-28 |
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US12/375,519 A-371-Of-International US20110310989A1 (en) | 2006-07-28 | 2007-07-27 | Radio Communication Device and Radio Communication Method |
US13/898,257 Continuation US20130250794A1 (en) | 2006-07-28 | 2013-05-20 | Radio Communication Device and Radio Communication Method |
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WO2008013254A1 true WO2008013254A1 (fr) | 2008-01-31 |
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PCT/JP2007/064742 WO2008013254A1 (fr) | 2006-07-28 | 2007-07-27 | Dispositif de communication radio et procede de communication radio |
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US (4) | US20110310989A1 (ja) |
EP (2) | EP2048805A4 (ja) |
JP (1) | JP2008035285A (ja) |
KR (1) | KR101058633B1 (ja) |
WO (1) | WO2008013254A1 (ja) |
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JP2008035285A (ja) * | 2006-07-28 | 2008-02-14 | Kyocera Corp | 無線通信装置及び無線通信方法 |
GB2509161B (en) * | 2012-12-21 | 2018-09-26 | Sony Corp | Telecommunications apparatus and method |
US10644630B2 (en) | 2017-11-28 | 2020-05-05 | General Electric Company | Turbomachine with an electric machine assembly and method for operation |
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2013
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Also Published As
Publication number | Publication date |
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EP2048805A4 (en) | 2014-03-26 |
US9166752B2 (en) | 2015-10-20 |
KR20090024828A (ko) | 2009-03-09 |
EP2816750A1 (en) | 2014-12-24 |
KR101058633B1 (ko) | 2011-08-22 |
US8982684B2 (en) | 2015-03-17 |
US20110310989A1 (en) | 2011-12-22 |
JP2008035285A (ja) | 2008-02-14 |
US20130250794A1 (en) | 2013-09-26 |
EP2048805A1 (en) | 2009-04-15 |
EP2816750B1 (en) | 2017-12-27 |
US20150139178A1 (en) | 2015-05-21 |
US20140133339A1 (en) | 2014-05-15 |
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