WO2007052812A1 - 上りリンクの送信パラメータを決定する装置及び方法 - Google Patents
上りリンクの送信パラメータを決定する装置及び方法 Download PDFInfo
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- WO2007052812A1 WO2007052812A1 PCT/JP2006/322210 JP2006322210W WO2007052812A1 WO 2007052812 A1 WO2007052812 A1 WO 2007052812A1 JP 2006322210 W JP2006322210 W JP 2006322210W WO 2007052812 A1 WO2007052812 A1 WO 2007052812A1
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Classifications
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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
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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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
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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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
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
- H04L1/0004—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to control information
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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
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
- H04L1/0005—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to payload information
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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
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/001—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to control information
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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
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0011—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding applied to payload information
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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
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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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
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
- H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
-
- 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
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0079—Formats for control data
- H04L1/008—Formats for control data where the control data relates to payload of a different packet
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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
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
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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
Definitions
- the present invention relates to an apparatus for determining uplink transmission parameters.
- the present invention relates generally to the unreliable technical field, and more particularly to an apparatus and method for determining transmission parameters for transmitting a shared bucket data channel in the uplink.
- AMC Adaptive Modulation and Channel Coding
- the throughput includes the throughput of each user as well as the throughput of the entire system, and it is desirable to increase both of them.
- future communication systems are required to achieve even greater throughput than they currently do. Therefore, it is even more important to improve the transmission quality of the signal by appropriately adjusting the transmission parameters to the channel conditions (this is called “link adaptation”).
- Non-Patent Document 1 3GPP, TR25.848: "Physical Layer Aspects of UTRAN High Speed Downlink Packet Access" Disclosure of Invention
- the present invention is suitable for uplink radio channel conditions; it is an apparatus and method for determining speech parameters.
- An apparatus for determining uplink transmission parameters comprises means for receiving channel state information from a mobile station, channel state information, an uplink modulation scheme and channel coding rate, and transmission power of the mobile station. And a means for storing the correspondence relationship with both or one of the word bandwidths, a means for deriving a set of word parameters from the self-correspondence relationship, and a means for deriving a set of fill parameters to the IE mobile station And a means for notifying.
- FIG. 1 shows a schematic block diagram of a base station according to an embodiment of the present invention.
- FIG. 2 shows a schematic block diagram of a mobile station according to an embodiment of the present invention.
- FIG. 3 shows a flowchart (1) of the transmission parameter determination method according to an embodiment of the present invention.
- FIG. 4 is a diagram illustrating an example of a look-up table.
- FIG. 5 is an explanatory diagram showing how the transmission bandwidth is determined.
- FIG. 6 is a diagram showing the correspondence between channel states and MCS numbers.
- FIG. 7 is a diagram showing a specific example of the MCS table.
- FIG. 8 shows a flowchart (2) of another language parameter determination method according to an embodiment of the present invention.
- FIG. 9 shows a flowchart (3) of another language parameter determination method according to an embodiment of the present invention.
- FIG. 10 is a flowchart (4) of another transmission parameter determination method according to an embodiment of the present invention.
- FIG. 11 is a diagram illustrating a state in which the transmission bandwidth is determined in consideration of a plurality of mobile stations.
- FIG. 12 is a chart showing a comparative example of the first to fourth embodiments.
- Figure 13 shows the single user M I MO system.
- Figure 14 is a diagram showing the Multi-user M I MO system.
- FIG. 15 is a diagram showing frequency bands in the single user M I MO system.
- FIG. 16 is a diagram showing frequency bands in the multiuser M I MO system.
- FIG. 17 shows a schematic block diagram of a base station according to an embodiment of the present invention.
- FIG. 18 shows a schematic block diagram of a mobile station according to an embodiment of the present invention.
- FIG. 19 is a flowchart of a language parameter determination method according to an embodiment of the present invention.
- FIG. 20 is a diagram showing a variation of the flow chart shown in FIG.
- FIG. 21 is a flowchart of a language parameter determination method according to an embodiment of the present invention.
- FIG. 22 is a diagram showing a modification of the flowchart shown in FIG.
- Figure 23 is according to an embodiment of the present invention.
- FIG. 24 is a diagram showing a variation of the flow chart shown in FIG.
- FIG. 25 shows a flowchart (4) of the transmission parameter determination method according to the embodiment of the present invention.
- FIG. 26 is a diagram showing a variation of the flow chart shown in FIG.
- FIG. 27 is a chart showing a comparative example of the seventh to tenth embodiments. Explanation of symbols 1 0 Base station
- a set of transmission parameters is derived based on channel state information received from a mobile station.
- a set of transmission parameters is derived from the stored correspondence between channel state information, uplink modulation method sa and channel / ⁇ encoding rate, and / or mobile station transmission power and / or bandwidth. And notified to the mobile station.
- the mobile station performs various settings according to this transmission parameter, and transmits subsequent uplink signals.
- the number of transmission parameter combinations can be greatly increased, and transmission parameters can be combined more appropriately according to channel conditions. Transmission quality can be further improved.
- the uplink data rate is adaptively adjusted, but the set of transmission power is kept constant;
- the parameters may be derived.
- the speech power is derived from the time average value of the channel state information, and the speech bandwidth, the number of modulation levels, and the channel coding rate are derived from the instantaneous value of the channel state information.
- the speech power and transmission bandwidth may be derived from the average value of the channel state information. This can improve the throughput of the entire system and further improve the resource utilization efficiency.
- a set of speech parameters may be derived so that the uplink data rate is maintained constant within a certain period of time; and the speech power is variably adjusted.
- the transmission bandwidth, the number of modulation levels, and the channel coding rate may be derived from the time average value of the channel state information, and the instantaneous value of the channel state information may be derived. This ⁇ is particularly advantageous for communications that require real-time performance.
- a set of i ⁇ word parameters may be derived so that at least one of the uplink reception error rate and throughput is improved.
- a plurality of channel state information may be received from a plurality of mobile stations, and a set of transmission parameters for each mobile station may be derived from the plurality of channel state information.
- a more appropriate transmission bandwidth can be determined by considering not only individual mobile stations but also even among a plurality of mobile stations.
- FIG. 1 shows a schematic block diagram of a base station according to an embodiment of the present invention.
- the base station 10 includes a radio unit (RF unit) 11, a signal extraction unit 12, a channel state measurement 13, demodulation and decoding units 14 and 15, and a transmission parameter determination unit 16.
- RF unit radio unit
- Radio unit (RF unit) 1 1 from mobile station; ⁇
- Various processing for converting radio packet received by antenna not shown to baseband signal for example, frequency conversion, band limitation, analog Digital conversion. It is not essential that a radio packet is transmitted from a mobile station, which can be said from any communication terminal including a fixed station; .
- the signal extraction unit 1 2 is coupled to the output of the RF unit 1 1, and includes the pilot channel, shared bucket control channel (abbreviated as “control channel”) included in the received signal, and Extract shared bucket data channels (abbreviated as “data channels”) and output them.
- the pilot channel, the control channel, and the data channel are multiplexed by time multiplexing, frequency multiplexing, code multiplexing, or a combination thereof and transmitted by radio. Therefore, the signal extraction unit 12 appropriately separates these multiplexed signals and functions as a demultiplexer.
- the channel state measurement unit 13 is coupled to one of the outputs of the signal extraction unit 12 to measure the reception quality of the pilot channel and prepare an instantaneous value of the reception quality.
- the quality of the received quality or channel condition is typically measured by the received signal power to noise power ratio (SIR or received SIR) of the channel, but more generally some appropriate channel condition information ( CQI: Channel Quality Indicator)
- CQI Channel Quality Indicator
- the channel state measurement unit 13 averages the instantaneous value of the reception quality over a certain period (for example, a period of about 10 ⁇ 1 3 to 1 s), calculates the time average value of the reception quality, Also output the channel status.
- the demodulation and decoding units 14 and 15 receive the control channel and the data channel from the signal extraction unit 12, respectively.
- the demodulation and decoding unit 14 demodulates and decodes the received control channel, extracts information necessary for demodulating the data channel (modulation number, channel number coding rate, etc.), and modulates and decodes it. 1 Notify 5
- the demodulation and decoding unit 15 demodulates and decodes the received data channel based on the notified control information, and prepares for further processing such as data transmission.
- the transmission parameter determination unit 1 6 is coupled to the output of the channel state measurement unit 1 3 to derive a set of transmission parameters for the subsequent uplink based on the instantaneous value and the time average value of the reception quality. Is output.
- the set of transmission parameters includes parameters related to uplink signal transmission such as mobile station transmission power, ⁇ bandwidth, modulation number, channel coding rate, and so on. Such a set of transmission parameters is derived at an appropriate frequency for each mobile station. The derived transmission parameters are reported to each mobile station on the downlink control channel. A specific method for deriving the word parameters will be described later.
- FIG. 2 shows a schematic block diagram of a mobile station according to an embodiment of the present invention.
- the mobile station 2 0 includes a speech buffer 2 1, modulation and coding units 2 2 and 2 3, a multiplexing unit 2 4, a bandwidth Limit filter 2 5 and scale? Unit 26, power amplification unit 27, and control channel demodulation and recovery 28 (demodulation and recovery related to the data channel are not shown for simplicity of illustration).
- the transmission buffer 21 temporarily stores the traffic data that the user wants to say and outputs it according to the specified data rate. There are actually elements that store and output control channel data, but they are not drawn for simplicity. This traffic data will make up the data channel within the word signal.
- the modulation and encoding unit 22 is coupled to the output of the transmission buffer 21 and converts the data channel into a channel so as to realize the instructed data rate and performs data modulation.
- the modulation and encoding unit 23 performs channel encoding and data modulation of the control channel.
- the multiplexing unit 24 is coupled to the outputs of the modulation and encoding units 2 2 and 23 and multiplexes the data channel and the control channel. Multiplexing may be time multiplexing, frequency multiplexing, code multiplexing, or a combination thereof.
- the band limiting filter unit 25 sets the bandwidth of the transmission signal according to the instruction content.
- five bandwidths of 1.25 MHz, 2.5 MHz, 5 MHz, 1 OMH, and 2 OMHz are prepared in the system, and one of them is appropriately selected.
- the Specific bandwidth values and prepared bandwidth types are not limited to these, and various numerical values may be used.
- the radio unit (RF unit) 26 performs various types of processing (for example, digital analog conversion, frequency conversion, etc.) to convert baseband signals into radio signals.
- the power amplifying unit 27 appropriately amplifies the power of the speech signal according to the instruction content.
- the control channel demodulation and decoding unit 28 demodulates and channel-decodes the control channel received in the downlink, and extracts a set of transmission parameters including transmission power, word bandwidth, modulation modulo and channel coding rate, etc. To do.
- the demodulation and decoding unit 28 notifies the content of the extracted transmission parameter to the speech buffer 21, the modulation and coding units 2 2 and 2 3, the band limiting filter unit 25 and the power amplification unit 27.
- FIG. 3 shows a flowchart of the method of determining the word parameter according to an example of the present invention; This flow is performed in the base station, and is mainly performed in the channel state measurement unit 1 3 and; ⁇ (word parameter determination unit 1 6 in FIG. 1.
- step S1 the instantaneous value of the reception quality or channel state is measured based on the received power level of the channel, and as described above, the reception quality or channel state is measured by the reception SIR.
- This received SIR is used as channel state information (CQI)
- the base station may perform frequency scheduling based on the received SIR, and an appropriate frequency band may be allocated to the mobile station.
- step S2 the instantaneous value of the channel state information is over a certain period (typically a period of 10 ms to 1 s 3 ⁇ 43 ⁇ 4, but various length periods may be used depending on the application).
- the time average value of the channel state information is calculated.
- step S3 the power at which the mobile station transmits the data channel is determined based on the time average value in the channel state. In this ⁇ , in addition to the time average value of the channel state information, the margin for each mobile station may be taken into account. This is because the achievable transmission power value of the mobile station may differ depending on the performance of the mobile station. In this embodiment, the transmission power of the mobile station is determined by referring to a lookup table.
- Figure 4 shows an example of a lookup table.
- the received power R i R x of the pilot channel at the base station the channel state information CQI, ⁇ CQI x , the transmission power PT of the mobile station, ⁇ PT x, and the base station per bandwidth Of the received power Di, w to Dx, w.
- Received power is provided for each of multiple bands i> gW. This correspondence is stored in some storage means and is read or updated as necessary.
- the CQI corresponding to the time average value of the channel state information is identified, and the transmission power is determined by finding the transmission power PT i corresponding to the CQI i.
- the relationship between the channel state information in the lookup table and the word power is determined in consideration of the interference to neighboring cells and the fairness of the data rate that each of the mobile stations can realize. Also good. In other words, mobile stations that exist near the cell boundary If the speech power is increased in consideration, interference to neighboring neighboring cells increases, so it is desirable to consider a look-up table that considers interference to neighboring cells. On the other hand, since the mobile station existing in the vicinity of the base station has little interference to the neighboring cells, it is possible to increase the data rate that can be achieved without increasing the interference to the neighboring cells by further increasing the transmission power. it can. However, when performing the above operations, the data rate of the mobile stations around the base station is increased at the expense of the data rate that can be realized by the mobile stations near the cell boundary. It is desirable to consider the fairness of the data rate that each of the above can achieve.
- the transmission bandwidth for the uplink data channel is determined based on the instantaneous value CQ I of the channel state ( and the determined transmission power PTi.
- CQ I of the channel state 1.25 MHz, 2.
- Five bandwidths are available for the uplink: 5 MHz, 5 MHz, 10 MHz and 20 MHz, of which the most appropriate for the current channel condition is selected in this step.
- the received power per unit band (at the base station) represents an estimate of the power received at the base station when the mobile station transmits a signal with the transmit power PT ( with a certain bandwidth W). for example, if the bandwidth is 1. 25MH z a is the transmission power was PT, the reception power per unit bandwidth at the base station is D u. 25.
- bandwidth in the same words power 2.5 received power at the base station when were MH z is represented by Du. 5.
- the base station prepares the received power Dl, 1.25 Dx, 20 per bandwidth at the base station. May consider the transmission bandwidth supported by the mobile station, since the achievable speech bandwidth of the mobile station may vary depending on the performance of the mobile station.
- Transmission bandwidth allocation may be considered for other mobile stations as well as the data rate required by the mobile station; ⁇ Bandwidth allocation may be considered ⁇ This transmission bandwidth for multiple mobile stations
- the bandwidth allocation is performed as part of the frequency scheduling considering the allocation of the transmission power PTi derived in Step 3 is derived from the time average value of the channel state information, and is derived from it.
- the received power Dtw also represents an average value.
- this average received power is further corrected by the instantaneous value CQI t of the channel state information, and an instantaneous received power Dtw ′ is derived. Based on the instantaneous threshold value of the received power derived in this way, the optimal bandwidth is instantaneously derived.
- Figure 5 shows how the optimal transmission bandwidth is determined.
- the received power D w ′ is obtained, and the relationship between the bandwidth and the received power is as shown in FIG.
- the predetermined threshold value is in a position indicated by ⁇ .
- the bandwidth is selected so that the received power per unit band at the base station exceeds the threshold and becomes as wide as possible.
- the bandwidths above the threshold are 1.25 MHz, 2.5 MHz, and 5 MHz as i ⁇ , the largest of which is the 5 MHz. It is determined.
- the speech bandwidth may be selected so that the received power falls below the threshold and becomes as narrow as possible.
- a wider bandwidth is desirable from the viewpoint of increasing the fading tolerance by obtaining the frequency diversity effect.
- the reception power at the base station needs to be high to a certain extent.
- step S 5 of FIG. 3 the number of modulation levels and the channel coding rate are determined based on the instantaneous value CQI of the channel state information and the transmission bandwidth. And combinations of modulation level and the channel coding rate is determined in advance in this embodiment, each of the combinations is MC S numbers in MC S table (MC S physician..., MC S x) It is specified by specifying.
- the correspondence between channel state information and MCS number is determined in advance as shown in Figure 6.
- Figure 7 shows an example of the MCS table, and also shows an example of combinations of modulation multi-level numbers and channel coding rates. In the example shown in the figure, the combination is set so that the relative bit rate increases as the MCS number increases.
- step S 6 of FIG. 3 the base station transmits the set of transmission parameters (transmission power, transmission bandwidth and tmc s number) determined in steps S 3, S 4 and S 5 to the mobile station. Notification is made on the downlink control channel.
- the mobile station demodulates the downlink control channel, and sets the channel encoding rate, the number of modulation levels, the transmission bandwidth, and the transmission power according to the speech parameters.
- the present embodiment since the transmission bandwidth and the MCS number are instantaneously changed based on the instantaneous B f of the channel state information, the present embodiment efficiently uses the transmission band as the entire system. Very desirable from a viewpoint.
- the data rate is changed instantaneously, while the word power is maintained constant on average. Therefore, this embodiment is particularly suitable for non-real-time data communication and the like that require little real-time performance.
- the present embodiment not only AMC but also transmission power and speech bandwidth are controlled, and the number of uplink transmission parameters can be greatly increased, and transmission parameters are more appropriately matched to channel conditions. Can be combined.
- AM C and speech power control for example, when the channel condition is good, there were only options to reduce speech power or increase MCS number.
- a selection for changing the speech bandwidth is also provided. Under a given transmission power, the transmission power per unit band (and hence the reception power at the base station) decreases as the bandwidth increases, and the transmission power per unit band (and thus at the base station) decreases as the bandwidth decreases. Received power) tends to increase.
- the power per unit band may be increased by decreasing the bandwidth.
- the channel condition is good, in addition to the above options, for example, only the transmission bandwidth can be reduced without reducing the transmission power or increasing the MCS number. Doing so saves system resources without changing the transmission rate.
- the base station derives a set of transmission parameters, in addition to the channel state information CQI, the magnitude of the error rate and the quality of the throughput may be considered. For example, after a set of transmission parameters is derived by the already described method, the value of the transmission power may be corrected based on the error rate. Also, depending on the transmission bandwidth The spreading factor of the spreading code may be adjusted.
- FIG. 8 shows another flowchart of the method for determining a word parameter according to an embodiment of the present invention.
- the flow starts at step S0, and a pilot channel is received from each mobile station in the uplink.
- step S1 the instantaneous value of reception quality or channel state information is measured based on the received power level of the channel.
- the instantaneous value of the channel state information is measured over a certain period, and the time average value of the channel state information is calculated.
- step S3 the speech power when the mobile station transmits the data channel is determined based on the time average value in the channel state.
- each mobile station's margin for power may be taken into account.
- the transmission 3 ⁇ 4 ⁇ of the mobile station is determined by referring to a lookup table as shown in FIG. More specifically, C Q I i corresponding to the time average value of the channel state information is specified, and by finding the transmission power P T corresponding to the C Q I, i ⁇ word power is determined.
- the transmission bandwidth is also derived based on the average value CQI i of the channel state information. That is, the reception power per unit band at the base station corresponding to the average value CQI i of the channel state information and the determined transmission power PT i is derived, and from the relationship between the reception power D 3 ⁇ 4 w and a predetermined threshold value The word bandwidth is derived.
- the method described in Fig. 5 can be applied to derive the transmission bandwidth from the received power Di ⁇ w.
- step S 4 the modulation multilevel 3 ⁇ 4 3 ⁇ 4 channel channelization rate is determined based on the instantaneous value CQI t of the channel state information.
- Step S5 the base station notifies the mobile station of the set of parameters determined in Steps S3 and S4; ⁇ (Difference parameters (transmission power, transmission bandwidth and MCS number) via the downlink control channel.
- the mobile station demodulates the downlink control channel, and sets the channel coding rate, the number of modulation levels, the transmission bandwidth, and the transmission power according to the content of the instruction regarding the transmission parameters.
- the transmission bandwidth is not changed instantaneously but is determined on average.
- Book The embodiment is preferable from the viewpoint of being easily applied to an existing system in which AMC is performed with a fixed bandwidth.
- FIG. 9 shows a flowchart of another transmission parameter determination method according to an embodiment of the present invention.
- the flow starts at step S0, and a pilot channel is received from each mobile station in the uplink.
- step S1 the instantaneous value of the reception quality or channel state information is measured based on the received power level of the channel.
- step S2 the instantaneous value of the channel state information is measured over a certain period, and the time average value of the channel state information is calculated.
- step S 3 the speech bandwidth and M CS number when the mobile station transmits the data channel are determined based on the time average value of the channel state.
- the margin regarding the transmission power of each mobile station may be considered.
- the transmission bandwidth of the mobile station is derived by referring to the lookup table as shown in Fig.4. Specifically, the received power per unit band at the base station corresponding to the average value C Q I i of the channel state information is derived, and the transmission bandwidth is derived from the relationship between the received power and a predetermined threshold. The method described in Fig. 5 can be applied to derive the transmission bandwidth from the received power.
- the MCS number is also derived based on the average value C Q I i of the channel state information.
- the correspondence between the average value of the channel state and the MCS number can be prepared in advance, and the MCS number can be derived from the correspondence.
- step S 4 the transmission power of the mobile station is derived from the instantaneous value CQI t of the channel state information.
- the correspondence between the instantaneous value of the channel state and the transmission power can also be prepared in advance, and from that correspondence, the power can be derived.
- step S5 the base station notifies the mobile station of the set of parameters determined in steps S3 and S4 ( ⁇ transmission power, speech bandwidth and MC S number) on the downlink control channel. .
- the mobile station demodulates the downlink control channel, and sets the channel encoding rate, the modulation level, the transmission bandwidth, and the transmission power according to the transmission parameters. Determine.
- the transmission bandwidth and the MCS number are not changed instantaneously but are determined on average. Therefore, since the data rate becomes relatively constant, this embodiment is particularly advantageous for real-time communication, for example.
- FIG. 10 shows a flowchart of a transmission parameter determination method according to an embodiment of the present invention.
- the flow starts at step S0, and a pilot channel is received from each mobile station on the uplink.
- step S1 the reception quality or channel status is measured based on the received power level of the channel.
- step S2 the channel state information instantaneous B ⁇ is measured over a certain period (typically a period of about 10 ms to 1 s), and the time average value of the channel state information is calculated.
- step S 3 the MCS number when the mobile station speaks the data channel is determined based on the time average value of the channel state.
- ⁇ in addition to the time average value of the channel state information, a margin related to the transmission power of each mobile station may be considered.
- step S4 the transmission power of the mobile station is derived from the instantaneous value CQI of channel state information ( and the determined MCS number).
- Step S 5 in based on the instantaneous value CQI t and the determined transmission power of the channel state information; transmission bandwidth is determined.
- step S6 the base station transmits the set of transmission parameters (transmission power, transmission bandwidth, and WCS number) determined in steps S3, S4, and S5 to the mobile station via the downlink control channel.
- the mobile station demodulates the downlink control channel and sets the channel coding rate, the number of modulation levels, the speech bandwidth, and the speech power according to the i ⁇ word parameter.
- the present embodiment is particularly advantageous for communications and the like (for example, voice communications) that require a lot of real-time characteristics.
- Figure 12 shows the first through fourth implementations that determine transmission power, word bandwidth, modulation method, etc.
- a comparative example of the example technique is shown.
- “Low” means that the quantized power shown in the top row of each column is determined by low-speed control, and is controlled by the long-term time average value of the channel state information. Means to be determined.
- “High” means that the amount shown in the top row of each column is determined by high-speed control, and it is adaptively determined by control using instantaneous values of channel state information.
- transmission parameters are determined for each mobile station.
- the speech bandwidth is determined in consideration of not only individual mobile stations but also a plurality of mobile stations.
- FIG. 11 shows how the transmission bandwidth is determined according to this embodiment.
- the bandwidths provided for the uplink of the system are 2.5 MHz, 5 MHz, 1 O MHz, and 15 MHz.
- the received power per unit band at the base station for users A and B has a magnitude relationship as shown in Figs. 11 (A) and (B).
- ⁇ The widest bandwidth among candidates that exceed the predetermined threshold is 1 O MHz for both user A and user B. Therefore, if the bandwidth of the entire system is equal to or greater than 2 O MHz, a bandwidth of 1 O MHz can be allocated to both. However, if the available bandwidth for the entire system is only 15 MHz, for example, such an allocation cannot be made. This embodiment provides a method for dealing with such a situation.
- the margin m R from the threshold for user B is greater than the margin m A from the threshold for user A (m B > m A ).
- the mobile station's speech parameter may be determined independently for each mobile station, or some adjustment may be made among a plurality of mobile stations.
- transmission power control the following methods (1) to (3) are also conceivable.
- the transmission power of mobile stations may be controlled so that all mobile stations have the same received power at the base station. This method is the same for all mobile stations! This is because the ⁇ throughput can achieve an error rate and ensure fairness among mobile stations. However, it may be disadvantageous in that the mobile station at the cell edge may cause large interference to other cells.
- Transmission power may be controlled so that all mobile stations perform transmission with the same transmission power. This method is advantageous from the viewpoint of maximizing the throughput in the cell. However, the throughput of users at the cell edge may deteriorate and the fairness among users may be lost.
- transmit power control is performed so that all mobile stations have received power at a certain level or more at the base station.
- the transmission power of the mobile station may be controlled such that the signal is higher and is received by the base station with power.
- the seventh to tenth embodiments of the present invention are embodiments related to a multi-antenna system or a multiple input multiple output (MIMO) system.
- the M I MO system includes a single user M I M0 system and a multi-user M I MO system.
- FIG. 13 shows the principle diagram of the single-user MI MO system.
- a base station (Node B) with two receiving antennas is shown from a communication terminal (UE) with two transmitting antennas, but the number of antennas is limited to such a number. Instead, various numbers of antennas may be used.
- different signals are simultaneously transmitted in the same frequency band from the transmitting antennas # 1 and # 2 of the communication terminal (UE).
- the base station receives these signals multiplexed in space and By executing the division method, each signal sequence transmitted from each transmitting antenna is restored. '
- Figure 14 shows the principle diagram of the multi-user M I MO method.
- UE 1 and UE 2 there are two or more communication terminals with UEs (UE 1 and UE 2), and a separate signal is said from each communication terminal. These signals multiplexed in space are received by the base station. A signal separation method is applied to the received signal, and each signal sequence transmitted from each communication terminal is restored.
- a signal separation method is applied to the received signal, and each signal sequence transmitted from each communication terminal is restored.
- the present invention may be applied to uplink signals in a multi-antenna system. However, it is assumed that the frequency bands used by multiple transmitting antennas or multiple users are common.
- Figure 15 shows how the frequency band of the signal communicated with the first ⁇ (word antenna # 1) is equal to the frequency band of the signal communicated with the second word antenna ⁇ 2 in the single-user MIMO system. For example, if the frequency band (system bandwidth) given to the system is 20 MHz and a band of 5 MHz is assigned to a user, the first and second transmit antennas # 1 and # 2 are Each uses the same 5 MHz frequency band.
- FIG. 16 shows how the frequency band of the signal communicated by the first user is equal to the frequency band of the signal communicated by the second user 2 in the multi-user MIMO system.
- the base station is a radio unit (RF unit) 1 1-1, 11-2, a signal separation unit 171, a signal extraction unit 12, a channel state measurement unit 13-1, 13_2, a demodulation unit 14-1, 15-1, 14-2, 15-2 and a transmission parameter determination unit 16.
- RF unit radio unit
- the base station is a radio unit (RF unit) 1 1-1, 11-2, a signal separation unit 171, a signal extraction unit 12, a channel state measurement unit 13-1, 13_2, a demodulation unit 14-1, 15-1, 14-2, 15-2 and a transmission parameter determination unit 16.
- RF unit radio unit
- Radio unit (RF unit) 1 1-1, 1 1 1 2 are various processes for converting radio buckets transmitted from a mobile station and received by a plurality of receiving antennas (not shown) into baseband signals (for example, , Frequency conversion, band limitation, analog-digital conversion, etc.).
- the signal separator 1 7 1 obtains two signals transmitted from the transmitting antennas # 1 and # 2 by applying some kind of signal separation method to two signals or data sequences that are spatially multiplexed and received simultaneously .
- the signal extraction unit 1 2 extracts a pilot channel, a shared bucket control channel (abbreviated as “control channel”) and a shared bucket-data channel (abbreviated as “data channel”) included in the separated transmission signal, Output them.
- the pilot channel, the control channel, and the data channel are multiplexed by time multiplexing, frequency multiplexing, code multiplexing, or a combination thereof, and transmitted without permission from each transmitting antenna. Therefore, the signal extraction unit 12 appropriately separates these multiplexed signals and functions as a demultiplexer.
- Channel state measurement units 1 3-1, 1 3-2 are coupled to the output of the pilot channel of the signal extraction unit 1 2 to measure the reception quality of the pilot channel; ⁇ Measure each.
- the demodulating and decoding units 14-1, 2, 15-1, 1 receive the control channel and the data channel from the signal extraction unit 12 for each transmission antenna.
- the demodulating and decoding units 1 4-1 and 1 4-2 decode the control channel received for each antenna, and information necessary for demodulating the data channel (modulation multi-level number, channel coding) Rate etc.) and extract it to the modulation and decoding units 15-1 and 15-2.
- the demodulation and decoding units 15-1 and 15-2 demodulate and decode the received data channel based on the notified control information, and prepare for further processing such as data transmission.
- the parameter determination ⁇ 16 is coupled to the outputs of the channel state measurement units 13-1, 13-2, and derives a set of transmission parameters for the subsequent uplink based on the instantaneous and temporal average values of the received quality, Output it.
- the set of speech parameters includes parameters related to uplink signal transmission, such as mobile station speech power, transmission bandwidth, modulation number, and channel coding rate. Such a set of transmission parameters is derived at an appropriate frequency for each mobile station. The derived speech parameters are reported to each mobile station on the downlink control channel. The 'specific derivation method of transmission parameters will be described later.
- FIG. 18 shows a schematic block diagram of a mobile station according to an embodiment of the present invention.
- the mobile station includes a transmission buffer 21, a modulation and encoding unit 22—1, 22_2, a band limiting filter 25-25, 25—2, an RF unit 26_1, 26—2, and a power amplification unit 27—1.
- 27_2 and a control channel demodulating / decoding unit 28 (encoding and modulation related to the control channel are not drawn for simplicity of illustration).
- the transmission buffer 21 temporarily stores traffic data to be transmitted by the user and outputs it according to the instructed data rate.
- Modulation and coding units 22-1, 22—2 are coupled to the output of the speech buffer 21.
- ⁇ Channel data channel to modulate the data channel to achieve the data rate specified for each antenna.
- Band-limiting filter units 25_1 and 25_2 set the bandwidth of the transmission signal according to the content of instructions for each antenna. In this embodiment, five bandwidths of 1.25 MHz, 2.5 MHz, 5 MHz, 10 MHz and 2 OMHz are prepared in the system, and one of them is appropriately selected. As described above, signals communicated with two transmitting antennas occupy the same frequency band.
- the radio units (RF units) 26-1, 26-2 perform various processes (eg, digital-analog conversion, frequency conversion, etc.) for converting baseband signals into radio signals for each transmit antenna.
- the power amplifying units 27-1 and 27-2 amplify the power of the transmission signal appropriately according to the contents of the instructions for each antenna.
- Control channel demodulation and recovery 28 is the control channel received on the downlink. Is demodulated and channel-decoded, and a set of speech parameters including speech power, transmission bandwidth, modulation modulo and channel coding rate is extracted for each antenna (demodulation and encoding unit 28 is extracted. The contents of the transmission parameters are sent to the transmission buffer 2 1, the modulation and coding unit 2 2-1, 2 2-2, the band limiting filter unit 2 5-1, 2 5-2 and the power amplification unit 2 7-1, 2 7 — In 2; ⁇ Notify each antenna individually.
- FIG. 19 shows a flowchart of a transmission parameter determination method according to an embodiment of the present invention.
- This flow is performed in the base station, and is mainly performed in the channel state measurement units 1 3-1 and 1 3-2 and the transmission parameter determination unit 16 in FIG.
- the flow starts from steps S 1 1 and S 2 1, and the uplink pilot channel transmitted from each mobile station antenna is received by the two receiving antennas of the base station.
- the illustrated flow shows the processing after some signal separation method is performed.
- There are two types of uplink one is the uplink from the first transmit antenna # 1, and the other is the uplink from the second transmit antenna # 2.
- the description in the single user M I MO system is given for the sake of simplicity, the present invention is also applicable to the multi user M I MO system.
- steps S 1 1 and 2 1 the reception quality or instantaneous value of the channel state is measured based on the reception power level of the uplink channel.
- step S 13 the instantaneous value of the channel state information is measured over a certain period, and in step S 13, the time average value of the channel state information is calculated.
- the fixed period is typically a period of about 1 O ms to 1 s, but various length periods may be used depending on the application.
- the instantaneous value of the channel state information is different between the antennas # 1 and # 2, but the time average values are expected to be the same. Therefore, step S13 is performed in common for each uplink.
- step S 14 the power when the mobile station transmits the data channel is determined based on the time average value of the channel state. In this case, in addition to the time average value of the channel state information, the margin regarding the word power of each mobile station may be considered. This is because the achievable transmission power value of a mobile station may differ depending on the performance of the mobile station. In this embodiment, the transmission power of the mobile station is explained in relation to FIG. It may be determined in the manner described.
- step S15 the channel state instantaneously for each uplink CQ I t CQ I t (2> and the transmission power PTi determined in step S 14
- five bandwidths are prepared for uplink: 1.25 MHz, 2.5 MHz, 5 MHz, 1 z ⁇ , and 2 ⁇ ⁇ .
- the most appropriate state is selected in the same way as described with respect to Fig. 4.
- the transmitted power ⁇ , derived in step S14, is derived from the time average value of the channel state information. since, the average received power even in.
- this embodiment representative of the received power Dtw be flat Hitoshiteki value at the base station that is estimated from that value is corrected by using the instantaneous value CQ I t of the channel state information
- the instantaneous received power Dtw ' is derived in this way.
- the issued on the basis of the received power ⁇ constant threshold, instantaneous optimal transmission bandwidth is derived.
- steps S 16 and S 26 the combination of the modulation multilevel number and the channel coding rate is determined for each uplink based on the instantaneous value CQ I ′ and the channel bandwidth of the channel state information.
- combinations of the modulation multi-level number and the channel coding rate are determined in advance, and each combination is stored in the MCS table.
- MCSi MCS X MCSi MCS X
- step S17 the base station uses the set of transmission parameters (transmission power, bandwidth and MCS number) specified for each uplink in steps S14, S15 and S16. Is notified on the downlink control channel.
- the mobile station demodulates the downlink control channel, and sets the channel coding rate, the number of modulation multi-values, the transmission bandwidth, and the transmission power for each transmission antenna according to the transmission parameters.
- the message bandwidth and MCS number are instantaneously changed for each uplink. It is highly desirable from the viewpoint of efficient use.
- the data rate is instantaneously changed, while the transmission power is maintained constant on average.
- FIG. 20 shows another flow chart of the method for determining the parameter according to one embodiment of the present invention. This flow is generally the same as the flow described in FIG. 19 except that step S 16 ′.
- step S16 'of this flow both the uplink and the downlink are determined based on the instantaneous channel state values measured for transmit antennas # 1 and # 2 and the determined bandwidth.
- the MCS number that is used in common is determined for both antennas # 1 and # 2.This can save the control bit number of the control channel (signaling channel) when performing AMC control.
- FIG. 21 shows a flowchart of another transmission parameter determination method according to an embodiment of the present invention.
- the flow starts at step S I 1, 21 and the uplink pilot channel from each transmitting antenna of the mobile station is received.
- steps S 1 2 and 22 the instantaneous value of the reception quality or channel state information is measured based on the received power level of the channel.
- step S13 the instantaneous value of the channel state information is measured over a certain period, and the time average value of the channel state information is calculated.
- step S14 the transmission power when the mobile station transmits the data channel from each transmission antenna is determined based on the time average value of the channel state.
- the margin regarding the transmission power of each mobile station may be considered in addition to the time average value of the channel state.
- the transmission power of the mobile station is determined by referring to a lookup table as shown in FIG. More specifically, CQ I, corresponding to the time average value of the channel state information, is specified, and the transmission power is determined by finding the transmission power PTi corresponding to the CQ I,.
- step S14 the transmission bandwidth is also derived based on the average value CQ I i of the channel state information.
- steps S 15 and S 25 the combination of the modulation multi-value number and the channel number U coding rate is determined for each transmission antenna based on the instantaneous value CQ I of the channel state information and the transmission bandwidth.
- combinations of modulation multi-values and channel numbers are determined in advance, and each of the combinations is the MCS number in the MCS table. It is specified by specifying the number (MC S,,..., MC S X ).
- step S 1 6 each of the uplinks in steps S 1 4, S 1 5 and S 2 5 ⁇ L ⁇ A set of defined; ⁇ Word parameters (word power, word bandwidth and MC S Number) to the mobile station via the downlink control channel.
- the mobile station demodulates the downlink control channel, and sets the channel number ratio, the number of modulation multi-values, the transmission bandwidth, and the speech power for each transmission antenna according to the transmission parameters.
- the transmission bandwidth is not changed instantaneously but is determined on average. This embodiment is preferable from the viewpoint of being easily applied to an existing system in which AMC is performed with a fixed bandwidth.
- FIG. 22 shows a flowchart of another transmission parameter determination method according to an embodiment of the present invention.
- This flow is generally the same as the flow already described in Fig. 21 except for the processing contents relating to step S15 '.
- step S 1 5 ′ of this flow based on the instantaneous channel state value measured for transmit antennas # 1 and # 2 and the determined transmit bandwidth, it is common to both transmit antennas # 1 and # 2.
- the MCS number to be used is determined. This saves the number of control channel control bits when performing AMC control.
- FIG. 23 shows a flowchart of another transmission parameter determination method according to an embodiment of the present invention.
- the flow starts from steps S 1 1 and 2 1, and an uplink pilot channel from each transmitting antenna of the mobile station is received.
- steps S 1 2 and 2 2 the instantaneous value of the reception quality or channel state information is measured for each uplink based on the received power level of the pipeline channel.
- step S13 the instantaneous value of the channel state information is measured over a certain period, and the time average value of the channel state information is calculated.
- step S 14 the transmission bandwidth when the mobile station transmits the data channel is determined based on the time average value of the channel state. Further, in this embodiment, in step S 14, the MCS number (the number of modulation levels and the channel number coding rate) is also derived based on the average value CQI of the channel state information. The correspondence between the average value of the channel state and the MCS number can be prepared in advance. Issue can be derived. ,
- step S 1 5 and S 2 5 the word power for each speech antenna of the mobile station is derived from the instantaneous value C Q I of the channel state information.
- step S 1 6 the base station moves a set of transmission parameters (language power, transmission bandwidth and IMC S number) determined for each uplink in steps S 14, S 15 and S 25. Notify the station on the downlink control channel.
- the mobile station demodulates the downlink control channel, and sets the channel coding rate, the modulation number, the transmission bandwidth, and the speech power according to the speech parameters for each transmit antenna.
- the transmission bandwidth and the MCS number are not changed instantaneously but are determined on average. Therefore, since the data rate becomes relatively constant, this embodiment is particularly advantageous for real-time communication, for example.
- FIG. 24 shows a flowchart of another transmission parameter determination method according to an embodiment of the present invention.
- This flow is generally the same as the flow already described in FIG. 23, but the processing contents for step S 1 5 ′ are different.
- transmit antennas # 1 and # 2 are based on the instantaneous channel conditions i 3 ⁇ 4 measured for transmit antennas # 1 and # 2 and the determined transmission bandwidth and MC S number. The common power used for both is determined. This saves the number of control channel control bits when performing AMC control.
- FIG. 25 shows a flowchart of a transmission parameter determination method according to an embodiment of the present invention.
- the flow begins with steps S l l and S 21, and an uplink pilot channel is received from each mobile station; In steps S 1 2 and S 2 2, an instantaneous value of reception quality or channel state is measured for each uplink based on the received power level of the channel.
- step S13 the instantaneous value of the channel state information is measured over a certain period (typically a period of about 10 ms to 1 s), and the time average value of the channel state information is calculated.
- step S 14 the MC S number power when the mobile station transmits the data channel; and the time average value of the channel state are determined for each of the uplinks.
- steps S 15 and S 25 the transmission power for each of the uplinks is derived from the instantaneous value CQI t of the channel state information for each language antenna and the determined MCS number.
- step S 16 the set of; ⁇ word parameters (transmission power, transmission bandwidth and IvlC S number) determined for each of the uplinks in steps S 14, S 15 and S 25
- the station notifies the mobile station via the downlink control channel.
- the mobile station demodulates the downlink control channel, and sets the channel coding rate, modulation modulation number, transmission bandwidth, and speech power according to the transmission parameters for each channel.
- the speech power regarding each transmission antenna is instantaneously changed. Therefore, this embodiment is particularly advantageous for communications and the like (for example, voice communications) that require a lot of real time.
- FIG. 26 shows a flowchart of another language parameter determination method according to an embodiment of the present invention.
- step S 1 5 ′ of this flow it is common to both transmit antennas # 1 and # 2 based on the instantaneous channel condition values measured for antennas # 1 and # 2 and the determined MC S number. The transmission power used is determined. This saves the number of control bits of the control channel when performing AMC control.
- FIG. 27 shows a comparative example of the methods of the seventh to 10th embodiments for determining the transmission power, transmission bandwidth, modulation method, and the like.
- Low J means that the amount shown in the top row of each column (transmission power, etc.) is determined by low-speed control. It means that it is determined by the control by the long period time average value of “High.” “High” means that the amount shown in the top row of each column is determined by the high-speed control. It means that it is determined adaptively by using the instantaneous value of information.
- “Common” means that the amount is set in common among the transmitting antennas.
- “Difference” means that the amount is set separately between transmit antennas.
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Abstract
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BRPI0618271-2A BRPI0618271A2 (pt) | 2005-10-31 | 2006-10-31 | aparelho e método para a determinação de parámetro de transmissão de enlace ascendente |
EP06823114A EP1953977A4 (en) | 2005-10-31 | 2006-10-31 | APPARATUS AND METHOD FOR DEFINING ASCENDING CHANNEL EMISSION PARAMETERS |
CN2006800492809A CN101346958B (zh) | 2005-10-31 | 2006-10-31 | 决定上行链路的发送参数的装置 |
US12/092,072 US8477732B2 (en) | 2005-10-31 | 2006-10-31 | Apparatus and method for determining uplink transmission parameters |
KR1020087012865A KR101234021B1 (ko) | 2005-10-31 | 2006-10-31 | 상향링크의 송신 파라미터를 결정하는 장치 및 방법 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009154527A1 (en) * | 2008-06-19 | 2009-12-23 | Telefonaktiebolaget L M Ericsson (Publ) | Improved uplink measurements in a cellular system |
KR101058623B1 (ko) | 2008-02-27 | 2011-08-22 | 삼성전자주식회사 | 통신 시스템에서 송신 전력 제어 방법 및 장치 |
Families Citing this family (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7599420B2 (en) * | 2004-07-30 | 2009-10-06 | Rearden, Llc | System and method for distributed input distributed output wireless communications |
BRPI0616542B1 (pt) | 2005-08-24 | 2019-07-16 | Interdigital Technology Corporation | Método e aparelho de ajuste do período de retroalimentação do indicador de qualidade de canais para aumentar a capacidade do link superior |
CA2659878C (en) | 2006-08-09 | 2013-10-22 | Lg Electronics Inc. | Method of estimating signal-to-noise ratio, method of adjusting feedback information transmission, adaptive modulation and coding method using the same, and transceiver thereof |
WO2008078733A1 (ja) * | 2006-12-26 | 2008-07-03 | Panasonic Corporation | 無線通信基地局装置および制御チャネルのmcs制御方法 |
JP5440494B2 (ja) * | 2008-03-31 | 2014-03-12 | 日本電気株式会社 | 基地局装置、無線リソースの制御方法、無線局制御プログラム、及び無線通信システム |
WO2009142564A1 (en) * | 2008-05-23 | 2009-11-26 | Telefonaktiebolaget L M Ericsson (Publ) | A method for link adaptation with a signal quality margin based on the bandwidth |
JP2010041377A (ja) * | 2008-08-05 | 2010-02-18 | Sharp Corp | 無線通信システム、基地局装置、移動局装置及び無線通信方法 |
JP5144813B2 (ja) * | 2008-08-29 | 2013-02-13 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | 適応変調符号化技術を使用するシステムについての最適化された接続許可制御 |
KR101013708B1 (ko) * | 2008-12-31 | 2011-02-10 | 주식회사 세아네트웍스 | 광대역 무선 통신 시스템에서의 스케줄링 장치 및 방법 |
US8705470B2 (en) | 2009-02-04 | 2014-04-22 | Ntt Docomo, Inc. | Radio base station and communication control method |
KR101298912B1 (ko) * | 2009-02-27 | 2013-08-20 | 노키아 지멘스 네트웍스 오와이 | 업링크 캐리어들을 우선순위 매기기 위한 방법들, 장치들, 및 컴퓨터 프로그램 물건들 |
WO2011001489A1 (ja) * | 2009-06-29 | 2011-01-06 | 富士通株式会社 | 無線通信装置、送信電力制御方法、および通信品質送信方法 |
JP2011023942A (ja) * | 2009-07-15 | 2011-02-03 | Ntt Docomo Inc | 無線基地局装置及び変調・符号化方式選択方法 |
WO2011039821A1 (ja) | 2009-10-02 | 2011-04-07 | 富士通株式会社 | 無線通信システム、基地局装置、端末装置、及び無線通信システムにおける無線通信方法 |
US8885745B2 (en) | 2009-12-23 | 2014-11-11 | Intel Corporation | Distortion-aware multiple input multiple output communications |
JP5423499B2 (ja) | 2010-03-16 | 2014-02-19 | 富士通株式会社 | 基地局装置、通信システムおよび通信システムの制御方法 |
US9154260B2 (en) * | 2010-03-26 | 2015-10-06 | Qualcomm Incorporated | Method and apparatus for reliable transmission of control information in a wireless communication network |
KR101695716B1 (ko) * | 2010-08-02 | 2017-01-13 | 삼성전자주식회사 | 다중안테나 시스템에서 평균 전송률을 제어하기 위한 스케줄링 방법 및 장치 |
EP2469942A1 (en) | 2010-12-21 | 2012-06-27 | Research in Motion UK Limited | RACH procedures and power level for MTC devices |
US20120202512A1 (en) * | 2011-02-04 | 2012-08-09 | Richard Neil Braithwaite | Data throughput for cell-edge users in a lte network using alternative power control for up-link harq relays |
JP2012191564A (ja) * | 2011-03-14 | 2012-10-04 | Fujitsu Ltd | 無線通信システム、基地局装置、端末装置及び無線通信方法 |
US20130244666A1 (en) * | 2012-03-19 | 2013-09-19 | Broadcom Corporation | Power Savings in a Mobile Communications Device Through Dynamic Control of Processed Bandwidth |
US20130279379A1 (en) * | 2012-04-24 | 2013-10-24 | Qualcomm Incorporated | Systems and methods for wireless communication of long data units |
US8948107B2 (en) * | 2012-05-31 | 2015-02-03 | Alcatel Lucent | Method and apparatus for resource allocation for device-to-device communication |
US9363686B2 (en) * | 2012-12-06 | 2016-06-07 | Qualcomm Incorporated | Method and system for unified rate adaptation for SU-BF and MU-MIMO operation |
JP5692213B2 (ja) * | 2012-12-25 | 2015-04-01 | 富士通株式会社 | 上り送信電力制御方法並びに端末装置、基地局装置及び無線通信システム |
WO2016007060A1 (en) * | 2014-07-09 | 2016-01-14 | Telefonaktiebolaget L M Ericsson (Publ) | Transmitting device, receiving device and methods performed therein |
US10411862B2 (en) * | 2015-05-06 | 2019-09-10 | Telefonaktiebolaget Lm Ericsson (Publ) | Inserting and extracting control data using frequency components |
JP7195146B2 (ja) * | 2016-12-26 | 2022-12-23 | 株式会社Nttドコモ | 端末 |
US10595217B2 (en) * | 2017-02-13 | 2020-03-17 | Qualcomm Incorporated | Flexible interleaving for wireless communications |
SG11201911604PA (en) | 2017-11-03 | 2020-01-30 | Guangdong Oppo Mobile Telecommunications Corp Ltd | Transmission parameter determination method, terminal device and network device |
US11239570B2 (en) * | 2018-10-16 | 2022-02-01 | Hook'd WiFi Inc. | Wireless communications system with scalable architecture |
JP7302230B2 (ja) * | 2019-03-28 | 2023-07-04 | 日本電信電話株式会社 | 伝送パラメータ制御方法および無線基地局 |
CN112910544B (zh) * | 2021-02-05 | 2022-11-25 | 上海航天测控通信研究所 | 一种在轨可配置星载l/s频段数据广播分发系统 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11215094A (ja) * | 1998-01-27 | 1999-08-06 | Hitachi Denshi Ltd | 直交周波数分割多重変調方式伝送帯域可変方法およびその装置 |
JP2003324385A (ja) * | 2002-04-25 | 2003-11-14 | Samsung Electronics Co Ltd | 電力を調節できる適応変調及びコーディング方式の移動通信システムとその方法 |
WO2004077778A1 (en) * | 2003-02-28 | 2004-09-10 | Nokia Corporation | Power and bit loading allocation in a communication system with a plurality of channels |
JP2005086593A (ja) * | 2003-09-10 | 2005-03-31 | Hitachi Ltd | 適応変復調方式及び無線通信システム |
JP2005142923A (ja) * | 2003-11-07 | 2005-06-02 | Matsushita Electric Ind Co Ltd | 無線通信装置及びmcs決定方法 |
JP2005286446A (ja) * | 2004-03-29 | 2005-10-13 | Hitachi Kokusai Electric Inc | 適応変調方式を使用した無線通信方法及び無線通信装置 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0360251A (ja) * | 1989-07-28 | 1991-03-15 | Nippon Telegr & Teleph Corp <Ntt> | 変調器 |
JPH0360251U (ja) | 1989-10-13 | 1991-06-13 | ||
EP1251663B1 (en) * | 2001-04-20 | 2014-03-12 | LG Electronics Inc. | System and methods for transmitting data on a reverse link channel |
EP1255368A1 (en) * | 2001-04-30 | 2002-11-06 | Siemens Information and Communication Networks S.p.A. | Method to perform link adaptation in enhanced cellular communication systems with several modulation and coding schemes |
US6944460B2 (en) * | 2001-06-07 | 2005-09-13 | Telefonaktiebolaget L M Ericsson (Publ) | System and method for link adaptation in communication systems |
US7149245B2 (en) * | 2002-04-29 | 2006-12-12 | Lucent Technologies Inc. | Link adaption in enhanced general packet radio service networks |
US8218609B2 (en) * | 2002-10-25 | 2012-07-10 | Qualcomm Incorporated | Closed-loop rate control for a multi-channel communication system |
RU2267863C2 (ru) | 2003-08-21 | 2006-01-10 | Корпорация "Самсунг Электроникс" | Способ адаптивного распределения частотно-временного ресурса, адаптивной модуляции, кодирования и регулировки мощности в системе связи |
EP1721395B1 (en) * | 2004-03-05 | 2013-04-17 | Qualcomm, Incorporated | Method and apparatus for receive diversity control in wireless communications |
GB2418105A (en) * | 2004-09-13 | 2006-03-15 | Fujitsu Ltd | Relative indicators used for scheduling of uplink transmissions |
-
2006
- 2006-01-17 JP JP2006009300A patent/JP4772514B2/ja not_active Expired - Fee Related
- 2006-10-30 TW TW095140016A patent/TW200729791A/zh not_active IP Right Cessation
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- 2006-10-31 BR BRPI0618271-2A patent/BRPI0618271A2/pt not_active IP Right Cessation
- 2006-10-31 WO PCT/JP2006/322210 patent/WO2007052812A1/ja active Application Filing
- 2006-10-31 KR KR1020087012865A patent/KR101234021B1/ko not_active IP Right Cessation
- 2006-10-31 EP EP06823114A patent/EP1953977A4/en not_active Withdrawn
- 2006-10-31 US US12/092,072 patent/US8477732B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11215094A (ja) * | 1998-01-27 | 1999-08-06 | Hitachi Denshi Ltd | 直交周波数分割多重変調方式伝送帯域可変方法およびその装置 |
JP2003324385A (ja) * | 2002-04-25 | 2003-11-14 | Samsung Electronics Co Ltd | 電力を調節できる適応変調及びコーディング方式の移動通信システムとその方法 |
WO2004077778A1 (en) * | 2003-02-28 | 2004-09-10 | Nokia Corporation | Power and bit loading allocation in a communication system with a plurality of channels |
JP2005086593A (ja) * | 2003-09-10 | 2005-03-31 | Hitachi Ltd | 適応変復調方式及び無線通信システム |
JP2005142923A (ja) * | 2003-11-07 | 2005-06-02 | Matsushita Electric Ind Co Ltd | 無線通信装置及びmcs決定方法 |
JP2005286446A (ja) * | 2004-03-29 | 2005-10-13 | Hitachi Kokusai Electric Inc | 適応変調方式を使用した無線通信方法及び無線通信装置 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101058623B1 (ko) | 2008-02-27 | 2011-08-22 | 삼성전자주식회사 | 통신 시스템에서 송신 전력 제어 방법 및 장치 |
US8165245B2 (en) | 2008-02-27 | 2012-04-24 | Samsung Electronics Co., Ltd. | Method and apparatus for controlling transmission power in a communication system |
WO2009154527A1 (en) * | 2008-06-19 | 2009-12-23 | Telefonaktiebolaget L M Ericsson (Publ) | Improved uplink measurements in a cellular system |
Also Published As
Publication number | Publication date |
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JP2007151056A (ja) | 2007-06-14 |
US20090247180A1 (en) | 2009-10-01 |
KR101234021B1 (ko) | 2013-02-19 |
TWI329433B (ja) | 2010-08-21 |
RU2421927C2 (ru) | 2011-06-20 |
KR20080074915A (ko) | 2008-08-13 |
BRPI0618271A2 (pt) | 2011-08-23 |
EP1953977A4 (en) | 2012-05-30 |
EP1953977A1 (en) | 2008-08-06 |
RU2008119078A (ru) | 2009-12-10 |
US8477732B2 (en) | 2013-07-02 |
JP4772514B2 (ja) | 2011-09-14 |
TW200729791A (en) | 2007-08-01 |
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