JP2006074492A - Base station device, communication terminal device and resources allocating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To appropriately allocate resources and to improve the transmission efficiency of the entire system by allocating the resources in consideration of a communication system. <P>SOLUTION: A line information acquiring part 104 extracts line quality information from a received signal. A resources allocation determining part 105 allocates resources to each communication terminal device on the basis of line information inputted from the line information acquisition part 104. A switching part 107 outputs transmission data to a modulating part 108 for a first communication system or a modulating part 109 for a second communication system according to an instruction of the resources allocation determining part 105. The modulating part 108 for a first communication system generates a transmission signal of an OFDM (orthogonal frequency division multiplexing) method. The modulating part 109 for a second communication system generates a transmission signal of a W-CDMA (wideband code division multiple access) method. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a base station apparatus, a communication terminal apparatus, and a resource allocation method, and more particularly to a base station apparatus, a communication terminal apparatus, and a resource allocation method that perform communication in a plurality of different communication systems.

  Currently, there are various communication methods as wireless communication services represented by mobile phones. For example, W-CDMA (Wideband Code Division Multiple Access) and OFDM (Orthogonal Frequency Division Multiplexing) called third generation wireless communication systems are known. W-CDMA is a CDMA system that uses radio waves with a wider frequency bandwidth. In general, by increasing the bandwidth, speeding up and stabilization of communication quality can be achieved. OFDM is a method of multiplexing a large number (several tens to several hundreds) of digitally modulated waves whose frequencies are orthogonal to each other in a certain signal section. In recent years, it has attracted attention as a strong transmission method (for example, Non-Patent Document 1).

In addition, with the recent diversification of services, it has been required to transmit a larger amount of data. In order to transmit a large amount of data, it is necessary to increase the transmission efficiency of the radio channel, so the base station apparatus allocates communication resources to the terminal apparatus according to the channel quality. Thereby, a large amount of data can be transmitted and the transmission efficiency of the entire system can be improved.
3GPP TR25.892

  However, in the past, since the frequency band to be used is different between the W-CDMA scheme and the OFDM scheme, in the system in which the base station apparatus allocates resources to the terminal apparatus, the base station apparatus has the W-CDMA scheme and the OFDM scheme. When considering communication with a terminal apparatus that can handle both of the above and a terminal apparatus that can only support the W-CDMA system, there is a problem in that resources such as frequency bands cannot be effectively used. That is, the terminal apparatus that can support both OFDM and W-CDMA can use both the frequency band for OFDM and the frequency band for W-CDMA, but the terminal apparatus that can support only W-CDMA can be used. Only the frequency band for W-CDMA can be used. In such a situation, when a terminal device supporting both OFDM and W-CDMA uses the frequency band for OFDM even though the frequency band for OFDM is vacant, only W-CDMA is used. However, there is a problem that the frequency resources that can be used by a terminal device that only supports the above are reduced, the frequency band for OFDMA is left, and the resources cannot be effectively used.

  The present invention has been made in view of such points, and by allocating resources in consideration of the communication system, it is possible to perform appropriate resource allocation and to improve the transmission efficiency of the entire system. An object is to provide a station apparatus, a communication terminal apparatus, and a resource allocation method.

  A base station apparatus according to the present invention includes a receiving means for receiving channel quality information, which is information of channel quality with a communication terminal apparatus, and a plurality of communication systems having different resources used for communication with the communication terminal apparatus. Resource allocation determining means for allocating resources to the communication terminal apparatus based on information and the channel quality information, and transmitting means for transmitting transmission data to the communication terminal apparatus using the resources allocated by the resource allocation determining means The structure which comprises these is taken.

  According to this configuration, a resource is allocated to a communication terminal apparatus based on a plurality of communication system information and channel quality information that are different from each other. Therefore, the resource can be allocated in consideration of the resource for each communication system. it can. As a result, appropriate resource allocation can be performed and transmission efficiency of the entire system can be improved.

  The resource allocation method according to the present invention includes a step of receiving channel quality information, which is information of channel quality with a communication terminal device, and a plurality of information on communication systems having different resources used for communication with the communication terminal device. And a step of allocating resources to the communication terminal apparatus based on the channel quality information, and a step of transmitting transmission data to the communication terminal apparatus using the allocated resource.

  According to this method, the resources are allocated to the communication terminal apparatus based on the communication system information and the channel quality information of a plurality of mutually used resources, so that the resources can be allocated in consideration of the resources for each communication system. it can. As a result, appropriate resource allocation can be performed and transmission efficiency of the entire system can be improved.

  According to the present invention, by allocating resources in consideration of a communication system, appropriate resources can be allocated and transmission efficiency of the entire system can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of base station apparatus 100 according to Embodiment 1 of the present invention.

  The antenna 101 receives a reception signal and outputs it to the radio unit 102 and transmits a transmission signal input from the radio unit 102.

  Radio section 102 down-converts the received signal input from antenna 101 from a radio frequency to a baseband frequency and outputs the result to demodulation section 103. Radio section 102 up-converts a transmission signal input from first communication system modulation section 108 or second communication system modulation section 109 from a baseband frequency to a radio frequency and outputs the result to antenna 101.

  The demodulator 103 demodulates the received signal input from the radio unit 102 and outputs the demodulated signal to the line information acquisition unit 104 and acquires uplink data.

  The line information acquisition unit 104 acquires line information from the received signal input from the demodulation unit 103 and outputs it to the resource allocation determination unit 105. In the line information, information on whether the line information has been reported by a communication terminal apparatus that can be used by switching both the OFDM system (first communication system) and the W-CDMA system (second communication system), or W -Information indicating whether or not the communication terminal device that can use only CDMA is line information reported. Here, the line information is, for example, CQI (Channel Quality Indicator).

  The resource allocation determination unit 105 allocates resources (frequency bands) to each communication terminal device based on the line information input from the line information acquisition unit 104. Then, the resource allocation determining unit 105 instructs the buffer 106 to output a data amount corresponding to the allocated resource, and the downlink data is processed in the communication system of the allocated resource frequency band. The switching unit 107 is instructed to switch. Details of the resource allocation determination unit 105 will be described later.

  Buffer 106 temporarily stores downlink transmission data, and outputs the stored transmission data to switching unit 107 in accordance with an instruction from resource allocation determination unit 105.

  The switching unit 107 outputs the transmission data input from the buffer 106 to the first communication system modulation unit 108 or the second communication system modulation unit 109 in accordance with an instruction from the resource allocation determination unit 105.

  The first communication system modulation unit 108 processes an OFDM transmission signal, modulates transmission data input from the switching unit 107, converts the data from a serial data format to a parallel data format, and further performs inverse fast Fourier transform. An OFDM signal is generated by performing frequency division multiplexing processing for converting and arranging the transmission signal on each subcarrier. Then, first communication system modulation section 108 inserts a guard interval into the generated OFDM signal and outputs the result to radio section 102.

  The second communication system modulation unit 109 performs processing of a W-CDMA transmission signal, modulates transmission data input from the switching unit 107, and then performs spreading processing to generate a W-CDMA signal. The W-CDMA signal is output to the wireless unit 102.

  Next, the configuration of communication terminal apparatus 200 that can support both the OFDM scheme and the W-CDMA scheme will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of communication terminal apparatus 200.

  The antenna 201 receives a received signal and outputs the received signal to the wireless unit 202 and transmits a transmission signal input from the wireless unit 202.

  Radio section 202 down-converts the received signal input from antenna 201 from a radio frequency to a baseband frequency, and outputs the result to first communication system channel estimation section 203 or second communication system channel estimation section 205. Radio section 202 up-converts the transmission signal input from modulation section 208 from a baseband frequency to a radio frequency and outputs it to antenna 201.

  The first communication system channel estimation unit 203 estimates channel variation from the OFDM received signal input from the radio unit 202, and outputs the estimated channel variation information to the channel information generation unit 207. Then, first communication system channel estimation section 203 estimates the channel fluctuation and outputs the received signal to first communication system demodulation section 204.

  The first communication system demodulator 204 removes the guard interval from the OFDM received signal input from the first communication system channel estimator 203, then converts the parallel data format to the serial data format and performs fast Fourier transform. Further, after performing channel compensation based on the channel fluctuation estimated by the first communication system channel estimating unit 203, the data is demodulated to obtain downlink data.

  The second communication system channel estimation unit 205 estimates channel variation from the W-CDMA received signal input from the radio unit 202 and outputs the estimated channel variation information to the channel information generation unit 207. Then, the second communication system channel estimation unit 205 estimates the channel fluctuation and outputs the received signal to the second communication system demodulation unit 206.

  The second communication system demodulation unit 206 performs channel compensation based on the channel fluctuation estimated by the second communication system channel estimation unit 205 with respect to the W-CDMA reception signal input from the second communication system channel estimation unit 205. After performing despreading processing, demodulation is performed to obtain downlink data.

  The channel information generation unit 207 generates channel information to be reported to the base station apparatus from the channel fluctuation information input from the first communication system channel estimation unit 203 or the second communication system channel estimation unit 205. Then, the line information generation unit 207 outputs the generated line information to the modulation unit 208. Specifically, the line information generation unit 207 generates line information in the W-CDMA frequency band or line information in the OFDM frequency band.

  Modulation section 208 modulates transmission data composed of uplink data and line information input from line information generation section 207 and outputs the modulated transmission data to radio section 202.

  Next, the configuration of communication terminal apparatus 300 that can support only the W-CDMA system will be described with reference to FIG. FIG. 3 is a block diagram showing a configuration of communication terminal apparatus 300.

  The antenna 301 receives a reception signal that is a W-CDMA signal, outputs the reception signal to the radio unit 302, and transmits a transmission signal input from the radio unit 302.

  Radio section 302 down-converts the received signal input from antenna 301 from a radio frequency to a baseband frequency and outputs the result to channel estimation section 303. Radio section 302 up-converts the transmission signal input from modulation section 306 from a baseband frequency to a radio frequency and outputs it to antenna 301.

  The channel estimation unit 303 estimates channel variation from the W-CDMA reception signal input from the radio unit 302 and outputs the estimated channel variation information to the channel information generation unit 305. Then, channel estimation section 303 outputs the received signal to demodulation section 304 after estimating the channel fluctuation.

  The demodulation unit 304 performs channel compensation on the W-CDMA received signal input from the channel estimation unit 303 based on the channel fluctuation estimated by the channel estimation unit 303, despreads the demodulated data, and demodulates the downlink data. obtain.

  The channel information generation unit 305 generates channel information for reporting to the base station apparatus from the channel fluctuation information input from the channel estimation unit 303. Then, line information generation section 305 outputs the generated line information to modulation section 306.

  Modulation section 306 modulates transmission data composed of uplink data and line information input from line information generation section 305 and outputs the modulated transmission data to radio section 302.

  Next, a detailed configuration of the resource allocation determination unit 105 will be described with reference to FIG. FIG. 4 is a block diagram showing the configuration of the resource allocation determination unit 105.

  Based on the line information input from the line information acquisition unit 104, the communication system determination unit 401 determines whether there is a communication terminal apparatus that can use both the OFDM scheme and the W-CDMA scheme in its own cell, and the W- It is determined whether or not a communication terminal apparatus that can use only the CDMA system exists in the own cell. Then, the communication system determination unit 401 outputs the determination result to the resource allocation unit 403. Note that the communication system determination unit 401 is not limited to the determination based on the line information, but may be notified in advance from the communication terminal device by the control information.

  The resource management unit 402 manages resources using resource information, which is information on available resources, and information on used resources input from the resource allocation unit 403. Then, the resource management unit 402 outputs the management information of the resource managed at a predetermined timing to the resource allocation unit 403.

  The resource allocation unit 403 uses the line information input from the line information acquisition unit 104, the determination result input from the communication system determination unit 401, and the resource management information input from the resource management unit 402 to determine the resource information for the communication terminal apparatus. Make an assignment. Then, the resource allocation unit 403 instructs the buffer 106 and the switching unit 107 based on the allocated resource. For example, when there are a communication terminal apparatus that can use both OFDM and W-CDMA systems and a communication terminal apparatus that can use only the W-CDMA system in a cell, both systems can be used. When the number of communication terminal devices is smaller than the number of communication terminal devices that can use only the W-CDMA system, the resource allocation unit 403 is within the range of the maximum allocated resources managed by the resource management unit 402. Of the resources that can be used by the communication terminal device in the own cell, the communication terminal device that can use both the OFDM scheme and the W-CDMA scheme is preferentially assigned to the communication terminal device from the OFDM scheme resources.

  Next, the resource allocation method will be described with reference to FIG. FIG. 5 is a flowchart showing a resource allocation method. For convenience of explanation, the communication terminal apparatus 200 that can use both the OFDM scheme and the W-CDMA scheme is described as an A terminal, and the communication terminal apparatus 300 that can use only the W-CDMA scheme is described as a B terminal.

  First, base station apparatus 100 determines whether or not both terminal A and terminal B exist in its own cell at resource allocation determination section 105 (step ST501). When both A terminal and B terminal exist in the own cell, resource allocation determining section 105 allocates OFDM resource to A terminal and allocates W-CDMA resource to B terminal (step ST502). ).

  In step ST501, when both the A terminal and the B terminal do not exist in the own cell, the resource allocation determining unit 105 determines whether only the A terminal exists in the own cell (step ST503). When only the A terminal exists in the own cell, the resource allocation determination unit 105 selects the optimum resource from the resources of both the W-CDMA resource and the OFDM resource, or the W-CDMA resource and the OFDM resource. Both resources are allocated to the A terminal (step ST504).

  On the other hand, in step ST503, when only the A terminal does not exist in the own cell, that is, when only the B terminal exists in the own cell, the resource allocation determining unit 105 allocates W-CDMA resources to the terminal B. (Step ST505).

  As described above, according to the first embodiment, resources are allocated in consideration of a communication system that can be used by a communication terminal apparatus existing in the own cell, so that appropriate resources can be allocated. The transmission efficiency of the entire system can be improved. Further, according to the first embodiment, when a communication terminal apparatus that can use both the W-CDMA scheme and the OFDM scheme is less popular than a communication terminal apparatus that can use only the W-CDMA scheme, W- There is a possibility that the number of communication terminal devices that can use only CDMA is larger than the number of communication terminal devices that can use both the W-CDMA scheme and the OFDM scheme. Also, appropriate resource allocation can be performed.

  In the first embodiment, when the number of communication terminal apparatuses that can use both the W-CDMA scheme and the OFDM scheme is smaller than the number of communication terminal apparatuses that can use only the W-CDMA scheme. However, the OFDM terminal resources are preferentially allocated to the communication terminal apparatuses that can use both systems. However, the present invention is not limited to this, and the number of communication terminal apparatuses that can use both systems and W-CDMA. Regardless of the number of communication terminal devices that can use only the method, communication terminal devices that can use both methods may be automatically preferentially assigned from resources of the OFDM method.

(Embodiment 2)
FIG. 6 is a block diagram showing a configuration of base station apparatus 600 according to Embodiment 2 of the present invention.

  Base station apparatus 600 according to Embodiment 2 adds control information generation section 601 as shown in FIG. 6 to base station apparatus 100 according to Embodiment 1 shown in FIG. In FIG. 6, parts having the same configuration as in FIG.

  The resource allocation determination unit 105 allocates resources to each communication terminal device based on the line information input from the line information acquisition unit 104. Then, the resource allocation determination unit 105 instructs the buffer 106 to output a data amount corresponding to the allocated resource, and switches the switching unit 107 so that processing is performed in the communication system of the allocated resource frequency band. Is instructed to switch. Further, the resource allocation determining unit 105 controls the communication terminal apparatus information that can use both the OFDM scheme and the W-CDMA scheme determined from the line information, or the communication terminal apparatus information that can use only W-CDMA, as control information. The data is output to the generation unit 601.

  Based on the information on the communication terminal device input from the resource allocation determination unit 105, the control information generation unit 601 instructs each communication terminal device about the line information reported by the communication terminal device. Specifically, the control information generation unit 601 performs communication with a communication terminal apparatus that can use both the OFDM scheme and the W-CDMA scheme with respect to either the W-CDMA scheme resource or the OFDM scheme resource. Control information for instructing to report the channel information of both the W-CDMA system resource and the OFDM system resource. Also. The control information generation unit 601 generates control information for instructing a communication terminal apparatus capable of supporting only the W-CDMA system to report line information about resources of the W-CDMA system. At this time, the control information generation unit 601 gives control information instructing to preferentially transmit OFDM resource channel information to a communication terminal apparatus that can use both the OFDM scheme and the W-CDMA scheme. Generate. Then, the control information generation unit 601 outputs the generated control information to the second communication system modulation unit 109.

  The second communication system modulation unit 109 performs processing of a W-CDMA transmission signal, modulates transmission data input from the switching unit 107, and then performs spreading processing to generate a W-CDMA signal. The W-CDMA signal is output to the wireless unit 102. Also, the second communication system modulation unit 109 includes the control information input from the control information generation unit 601 in a W-CDMA transmission signal and outputs the control information to the radio unit 102.

  Next, the configuration of communication terminal apparatus 700 that can use both the OFDM scheme and the W-CDMA scheme will be described with reference to FIG. FIG. 7 is a block diagram showing a configuration of communication terminal apparatus 700. As shown in FIG. 7, communication terminal apparatus 700 according to Embodiment 2 adds control information extraction section 701 to communication terminal apparatus 200 according to Embodiment 1 shown in FIG. In FIG. 7, parts having the same configuration as in FIG.

  The second communication system demodulation unit 206 demodulates and outputs the W-CDMA received signal input from the second communication system channel estimation unit 205 to the control information extraction unit 701 after performing channel compensation and despreading processing. Get downlink data.

  The control information extraction unit 701 extracts control information from the reception data input from the second communication system demodulation unit 206 and outputs the control information to the line information generation unit 207.

  The line information generation unit 207 is based on the control information input from the control information extraction unit 701, and the line information of either frequency band of OFDM or W-CDMA, or the line of both frequency bands of OFDM and W-CDMA Generate information. The channel information of the OFDM frequency band from the information on the channel fluctuation input from the channel estimation unit 203 for the first communication system, or the frequency band of the W-CDMA from the information of the channel fluctuation input from the channel estimation unit 205 for the second communication system. Generate line information. Then, the line information generation unit 207 outputs the generated line information to the modulation unit 208.

  Modulation section 208 modulates transmission data composed of uplink data and line information input from line information generation section 207 and outputs the modulated transmission data to radio section 202.

  Next, the configuration of communication terminal apparatus 800 that can use only the W-CDMA system will be described with reference to FIG. FIG. 8 is a block diagram showing a configuration of communication terminal apparatus 800. As shown in FIG. 8, communication terminal apparatus 800 according to Embodiment 2 adds control information extraction section 801 to communication terminal apparatus 300 according to Embodiment 1 shown in FIG. In FIG. 8, parts having the same configuration as in FIG.

  Demodulation section 304 despreads the W-CDMA received signal input from channel estimation section 303 and then demodulates and outputs it to control information extraction section 801 and obtains downlink data.

  The control information extraction unit 801 extracts control information from the received data input from the demodulation unit 304 and outputs the control information to the line information generation unit 305.

  When the control information is input from the control information extraction unit 801, the channel information generation unit 305 generates channel information for reporting to the base station apparatus from the channel fluctuation information input from the channel estimation unit 303. Then, line information generation section 305 outputs the generated line information to modulation section 306.

  Next, the resource allocation method will be described with reference to FIG. FIG. 9 is a flowchart showing a resource allocation method. For convenience of explanation, a communication terminal apparatus 700 that can use both the OFDM scheme and the W-CDMA scheme is described as an A terminal, and a communication terminal apparatus 800 that can use only the W-CDMA scheme is described as a B terminal.

  First, base station apparatus 600 determines whether or not both terminal A and terminal B exist in its own cell at resource allocation determination section 105 (step ST901). When both the A terminal and the B terminal exist in the own cell, the base station apparatus 600 instructs the control information generating unit 601 to instruct the A terminal to report the OFDM line information. And transmitting control information to the A terminal, the terminal A is instructed to report OFDM line information (step ST902). The terminal A that has received the control information extracts the control information by the control information extraction unit 701, and generates OFDM line information by the line information generation unit 207. Terminal A then reports the generated OFDM line information (step ST903). Furthermore, base station apparatus 600 generates control information instructing B terminal to report W-CDMA line information in control information generating section 601 and transmits the control information to B terminal. Thus, the terminal B is instructed to report W-CDMA line information (step ST904). Then, the B terminal that has received the control information extracts the control information by the control information extraction unit 801, and generates W-CDMA line information by the line information generation unit 305. Terminal B then reports the generated W-CDMA line information (step ST905). Note that the order of step ST903 and step ST904 may be reversed. That is, it is possible to instruct terminal A and terminal B to report line information, respectively, and thereafter terminal A and terminal B may report according to the instructions. In this case, since the line information report instruction and the line information report can be performed by one continuous process at the A terminal and the B terminal before the line is allocated, the control delay can be eliminated.

  On the other hand, in step ST901, when both the A terminal and the B terminal do not exist in the own cell, the resource allocation determining section 105 determines whether only the A terminal exists in the own cell (step ST906). ). When only the A terminal exists in the own cell, the base station apparatus 600 uses the control information generating unit 601 to instruct the A terminal to report both W-CDMA and OFDM line information. Is generated and the control information is transmitted to the A terminal, thereby instructing the A terminal to report the W-CDMA and OFDM channel information (step ST907). Next, the terminal A that has received the control information extracts the control information by the control information extraction unit 701, and generates the W-CDMA line information and the OFDM line information by the line information generation unit 207. Terminal A then reports the generated line information (step ST908).

  In Step ST906, when only the A terminal does not exist in the own cell, that is, when only the B terminal exists in the own cell, the base station apparatus 600 uses the control information generating unit 601 to By generating control information for instructing to report W-CDMA line information and transmitting the control information to the B terminal, the B terminal is instructed to report W-CDMA line information (step) ST909). Next, the B terminal that has received the control information extracts the control information by the control information extraction unit 801, and generates W-CDMA line information by the line information generation unit 305. Terminal B reports the generated line information (step ST910).

  Then, base station apparatus 600 that has received the line information from terminal A or terminal B allocates resources in resource allocation determining section 105 (step ST911). Specifically, resource allocation determining section 105 performs terminal A in step ST903. When the line information is received from the mobile station, OFDM resources are allocated to the A terminal and W-CDMA resources are allocated to the B terminal. When resource allocation determining section 105 receives line information from terminal A in step ST908, resource allocation determining section 105 provides the terminal A with the optimal resource of W-CDMA and OFDM resources, or W-CDMA resource and OFDM. Allocate both resources. In addition, when the channel allocation information is received from the B terminal in Step ST910, the resource allocation determining unit 105 allocates W-CDMA resources to the B terminal.

  As described above, according to the second embodiment, in addition to the effect of the first embodiment, the communication terminal apparatus reports the line information of the resource instructed from the base station apparatus, and therefore reports the line information. Therefore, it is possible to save uplink resources. Further, according to the second embodiment, when there is no communication terminal apparatus that can use only the W-CDMA system in the own cell, the communication terminal apparatus that can use both the OFDM system and the W-CDMA system. On the other hand, since both W-CDMA and OFDM resources can be allocated, the resources of the entire system can be used effectively.

  In the second embodiment, the communication terminal apparatus that can use only the W-CDMA system reports the line information instructed by the control signal. However, the present invention is not limited to this, and only the W-CDMA system is used. The usable communication terminal apparatus may always report the line information without being instructed by the control signal.

(Embodiment 3)
FIG. 10 is a block diagram showing a configuration of communication terminal apparatus 1000 according to Embodiment 3 of the present invention. Communication terminal apparatus 1000 is a communication terminal apparatus that can support both the first communication system and the second communication system.

  As shown in FIG. 10, communication terminal apparatus 1000 according to Embodiment 3 adds control information reception determination section 1001 and control information extraction section 1002 to communication terminal apparatus 200 according to Embodiment 1 shown in FIG. In addition, a line information generation unit 1003 is provided instead of the line information generation unit 207. In FIG. 10, parts having the same configuration as in FIG.

  The second communication system demodulation unit 206 demodulates the W-CDMA reception signal input from the second communication system channel estimation unit 205 and then demodulates the received signal, thereby receiving a control information reception determination unit 1001 and a control information extraction unit. Output to 1002 and obtain downlink data.

  The control information reception determination unit 1001 determines whether the reception data input from the second communication system demodulation unit 206 includes control information for generating line information. The control information reception determination unit 1001 instructs the control information extraction unit 1002 to extract the control information when the control information is included, and when the control information is not included, Information indicating that the control information is not included is output to the line information generation unit 1003.

  When the control information extraction unit 1001 is instructed to extract the control information from the control information reception determination unit 1001, the control information extraction unit 1002 extracts the control information from the reception data input from the second communication system demodulation unit 206 to obtain line information. The data is output to the generation unit 1003.

  When information indicating that the control information is not included is input from the control information reception determination unit 1001, the channel information generation unit 1003 uses the information on the channel fluctuation input from the channel estimation unit 203 for the first communication system to determine the OFDM information. Resource line information is preferentially generated, and W-CDMA resource line information is generated as necessary. Then, line information generation section 1003 outputs the generated line information to modulation section 208. In addition, when the control information is input from the control information extraction unit 1002, the line information generation unit 1003 performs OFDM based on the line fluctuation information input from the first communication system channel estimation unit 203 based on the input control information. When generating the channel information of the resource, the channel information of the W-CDMA resource is generated from the channel fluctuation information input from the channel estimation unit 203 for the first communication system, or the channel estimation unit 205 for the second communication system. The line information is generated by selecting the case where the line information of the W-CDMA resource is generated from the line fluctuation information input from. Then, line information generation section 1003 outputs the generated line information to modulation section 208.

  Modulating section 208 modulates transmission data composed of uplink data and line information input from line information generating section 1003, and outputs the modulated transmission data to radio section 202. The configuration of the base station apparatus is the same as that in FIG. 6, and the configuration of the communication terminal apparatus that can use only the W-CDMA system is the same as that in FIG.

  Next, a resource allocation method will be described with reference to FIG. FIG. 11 is a flowchart showing a resource allocation method. For convenience of explanation, a communication terminal apparatus 1000 that can use both the OFDM scheme and the W-CDMA scheme is described as an A terminal, and a communication terminal apparatus that can use only the W-CDMA scheme is described as a B terminal.

  First, terminal A determines whether or not control information is received at control information reception determination section 1001 (step ST1101). If the control information is not received, for example, when the communication terminal apparatus 1000 is turned on or when a downlink transmission request is started, the terminal A generates line information for OFDM resources in the line information generation unit 1003. Report the generated line information. Also, terminal B generates line information of W-CDMA resources and reports the generated line information (step ST1102). When receiving the control information, the terminal A generates and generates the channel information of the W-CDMA resource or the channel information of the OFDM resource instructed by the base station apparatus in the channel information generation unit 1003 Report line information. Also, terminal B generates line information of W-CDMA resources and reports the generated line information (step ST1103).

  When the base station apparatus receives the report of the channel information in step ST1102, the base station apparatus allocates OFDM resources to the A terminal and allocates W-CDMA resources to the B terminal (step ST1104). .

  Thus, according to the third embodiment, in addition to the effects of the first embodiment, OFDM resources are given priority to communication terminal apparatuses that can use both the OFDM scheme and the W-CDMA scheme. Therefore, appropriate resources can be allocated and transmission efficiency of the entire system can be improved. Further, according to the third embodiment, when OFDM resources are preferentially allocated to a communication terminal apparatus that can use both the OFDM scheme and the W-CDMA scheme, there is no need to send control information. Therefore, resources for sending downlink control information can be saved. Also, according to the third embodiment, the communication terminal apparatus reports the channel information of the OFDM resource when not instructed by the base station apparatus, and when instructed by the base station apparatus, the communication terminal apparatus Since line information is reported, it is possible to save uplink resources for reporting line information.

  In the third embodiment, the base station apparatus instructs the line information reported by the communication terminal apparatus using the control information. However, the present invention is not limited to this, and the communication terminal apparatus does not receive an instruction from the base station apparatus. Alternatively, it may be determined to report the line information of the W-CDMA resource after reporting the line information of the OFDM resource in advance, and the line information may be reported in the determined order. Further, in the third embodiment, the presence / absence of reception of control information is determined. However, the present invention is not limited to this, and whether or not the control information includes an instruction of line information to be always received and reported. May be determined.

(Embodiment 4)
FIG. 12 is a block diagram showing a configuration of base station apparatus 1200 according to Embodiment 4 of the present invention.

  As shown in FIG. 12, base station apparatus 1200 according to Embodiment 4 adds usage rate determining section 1201 to base station apparatus 100 according to Embodiment 1 shown in FIG. In FIG. 12, parts having the same configuration as in FIG.

  The utilization rate determination unit 1201 uses the OFDM system resource information and the W-CDMA resource usage rate and the W-CDMA resource usage based on the OFDM resource information and the W-CDMA resource information input from the resource allocation determination unit 105. Calculate the rate. Then, the usage rate determination unit 1201 obtains a ratio between the usage rate of the OFDM system resource and the usage rate of the W-CDMA system resource, and determines the resource allocation by comparing the obtained usage rate ratio and the threshold value To the unit 105.

  Based on the determination result input from the usage rate determination unit 1201, the resource allocation determination unit 105 determines that the OFDM scheme is based on the channel information input from the channel information acquisition unit 104 when the usage rate ratio is less than the threshold value. OFDM resources are preferentially allocated to communication terminal apparatuses that can use both the W-CDMA scheme and the W-CDMA scheme. In addition, the resource allocation determination unit 105 determines that, based on the determination result input from the usage rate determination unit 1201, if the usage rate ratio is equal to or greater than the threshold value, the resource allocation determination unit 105, based on the line information input from the line information acquisition unit 104, Resources are allocated to each communication terminal device. Then, the resource allocation determination unit 105 instructs the buffer 106 to output a data amount corresponding to the allocated resource, and switches the switching unit 107 so that processing is performed in the communication system of the allocated resource frequency band. Is instructed to switch.

  Next, the resource allocation method will be described with reference to FIG. FIG. 13 is a flowchart showing a resource allocation method. For convenience of explanation, a communication terminal apparatus that can use both the OFDM scheme and the W-CDMA scheme is described as an A terminal, and a communication terminal apparatus that can use only the W-CDMA scheme is described as a B terminal.

  First, base station apparatus 1200 calculates a usage rate by usage rate determination section 1201 (step ST1301). Next, the usage rate determination unit 1201 determines that the ratio of the OFDM system resource usage rate to the W-CDMA resource usage rate (OFDM resource usage rate / W-CDMA resource usage rate). It is determined whether it is less than threshold value α (step ST1302).

  When the usage ratio is less than the threshold value α, the resource allocation determining unit 105 allocates OFDM resources preferentially to the A terminal and allocates W-CDMA resources to the B terminal. (Step ST1303). On the other hand, when the usage ratio is equal to or greater than the threshold value α, the resource allocation determination unit 105 appropriately allocates W-CDMA resources or OFDM resources to the A terminal and the B terminal based on the line information ( Step ST1304).

  As described above, according to the fourth embodiment, in addition to the effects of the first embodiment, resources are allocated according to the usage rate. Therefore, when the W-CDMA resources are reduced, the first communication is performed. Since the OFDM resource is allocated to the communication terminal apparatus compatible with the system, the resource can be efficiently allocated without leaving the OFDM resource.

(Embodiment 5)
FIG. 14 is a block diagram showing a configuration of base station apparatus 1400 according to Embodiment 5 of the present invention.

  As shown in FIG. 14, base station apparatus 1400 according to Embodiment 5 adds usage number determination section 1401 to base station apparatus 100 according to Embodiment 1 shown in FIG. 1. 14, parts having the same configuration as in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.

  The number-of-use determination unit 1401 receives information on the number of communication terminal apparatuses that can use both the OFDM scheme and the W-CDMA scheme, and information on the number of communication terminal apparatuses that can use only the W-CDMA scheme. From the number information, a ratio between the number of communication terminal apparatuses that can use both the OFDM scheme and the W-CDMA scheme and the number of communication terminal apparatuses that can use only the W-CDMA scheme is calculated. Then, the usage number determination unit 1401 outputs a comparison result between the calculated ratio and the threshold value to the resource allocation determination unit 105.

  Based on the determination result input from the usage number determination unit 1401, the resource allocation determination unit 105 determines the number of communication terminal devices that can use both the OFDM scheme and the W-CDMA scheme and the communication terminal device that can use only the W-CDMA scheme. If the ratio of the numbers of the two is less than the threshold value, the communication terminal apparatus that can use both the OFDM scheme and the W-CDMA scheme is based on the channel information input from the channel information acquisition unit 104. Prioritize the resources. Further, based on the determination result input from the usage number determination unit 1401, the resource allocation determination unit 105 determines the number of communication terminal devices that can use both the OFDM scheme and the W-CDMA scheme and communication that can use only the W-CDMA scheme. When the ratio of the number of terminal devices is equal to or greater than the threshold value, resources are allocated to each communication terminal device based on the line information input from the line information acquisition unit 104. Then, the resource allocation determination unit 105 instructs the buffer 106 to output a data amount corresponding to the allocated resource, and switches the switching unit 107 so that processing is performed in the communication system of the allocated resource frequency band. Is instructed to switch.

  Next, a resource allocation method will be described with reference to FIG. FIG. 15 is a flowchart showing a resource allocation method. For convenience of explanation, a communication terminal apparatus that can use both the OFDM scheme and the W-CDMA scheme is described as an A terminal, and a communication terminal apparatus that can use only the W-CDMA scheme is described as a B terminal.

  First, the base station apparatus 1400 uses the number-of-use determination unit 1401 to determine the number of communication terminal apparatuses that can use both the OFDM scheme and the W-CDMA scheme and the number of communication terminal apparatuses that can use only the W-CDMA scheme. Is obtained (step ST1501). The usage number determination unit 1401 then compares the ratio of the number of communication terminal apparatuses that can use both the OFDM scheme and the W-CDMA scheme to the number of communication terminal apparatuses that can use only the W-CDMA scheme (number of terminals A / B Number of terminals). Next, the usage number determination unit 1401 determines that a ratio of the number of communication terminal apparatuses that can use both the OFDM scheme and the W-CDMA scheme to the number of communication terminal apparatuses that can use only the W-CDMA scheme is a threshold β. It is determined whether it is less than (step ST1502).

  When the ratio between the number of communication terminal apparatuses that can use both the OFDM scheme and the W-CDMA scheme and the number of communication terminal apparatuses that can use only the W-CDMA scheme is less than the threshold β, the resource allocation determination unit 105 preferentially assigns OFDM resources to the A terminal, and assigns W-CDMA resources to the B terminal (step ST1503). On the other hand, if the ratio of the number of communication terminal apparatuses that can use both the OFDM scheme and the W-CDMA scheme to the number of communication terminal apparatuses that can use only the W-CDMA scheme is equal to or greater than the threshold value β, resource allocation Determination section 105 appropriately assigns W-CDMA resources or OFDM resources to terminal A and terminal B based on the line information (step ST1504).

  As described above, according to the fifth embodiment, in addition to the effects of the first embodiment, the number of communication terminal apparatuses that can use both the OFDM scheme and the W-CDMA scheme and only the W-CDMA scheme are used. Since resources are allocated according to the ratio of the number of possible communication terminal apparatuses, when W-CDMA resources are reduced, OFDM resources are allocated to communication terminal apparatuses that can support the first communication system. Therefore, resources can be allocated efficiently without leaving excessive OFDM resources.

  In the first to fifth embodiments, the OFDM scheme and the W-CDMA scheme are used. However, the present invention is not limited to this, and W-CDMA and MC-CDMA (multi-carrier CDMA scheme) or TDD (Time Arbitrary communication systems such as Division Duplex (CDMA) and FDD (Frequency Division Duplex) CDMA can be combined. In the first to fifth embodiments, resources are allocated to communication terminal devices that can use two types of communication systems. However, the present invention is not limited to this, and three or more types of communication systems are used. Resources may be allocated to possible communication terminal devices. In the first to fifth embodiments, the frequency band is assigned as the resource. However, the present invention is not limited to this, and the present invention can also be applied to the case where resources other than the frequency band are assigned.

  The base station apparatus, communication terminal apparatus, and resource allocation method according to the present invention can perform appropriate resource allocation by allocating resources in consideration of the communication system, and can improve the transmission efficiency of the entire system. And is useful for allocating resources.

The block diagram which shows the structure of the base station apparatus which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of the communication terminal device which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of the communication terminal device which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of the resource allocation determination part which concerns on Embodiment 1 of this invention. The flowchart which shows the resource allocation method which concerns on Embodiment 1 of this invention The block diagram which shows the structure of the base station apparatus which concerns on Embodiment 2 of this invention. The block diagram which shows the structure of the communication terminal device which concerns on Embodiment 2 of this invention. The block diagram which shows the structure of the communication terminal device which concerns on Embodiment 2 of this invention. The flowchart which shows the resource allocation method which concerns on Embodiment 2 of this invention The block diagram which shows the structure of the communication terminal device which concerns on Embodiment 3 of this invention. The flowchart which shows the resource allocation method which concerns on Embodiment 3 of this invention. The block diagram which shows the structure of the base station apparatus which concerns on Embodiment 4 of this invention. The flowchart which shows the resource allocation method which concerns on Embodiment 4 of this invention. The block diagram which shows the structure of the base station apparatus which concerns on Embodiment 5 of this invention. The flowchart which shows the resource allocation method which concerns on Embodiment 5 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Base station apparatus 101 Antenna 102 Radio | wireless part 103 Demodulation part 104 Channel information acquisition part 105 Resource allocation determination part 106 Buffer 107 Switching part 108 Modulation part for 1st communication systems 109 Modulation part for 2nd communication systems

Claims (16)

Receiving means for receiving line quality information, which is information of line quality with the communication terminal device;
Resource allocation determining means for allocating resources to the communication terminal apparatus based on information of a plurality of communication resources used for communication with the communication terminal apparatus and different channel quality information;
Transmitting means for transmitting transmission data to the communication terminal device using the resources allocated by the resource allocation determining means;
A base station apparatus comprising:   The resource allocation determining means preferentially allocates a communication system resource with a smaller number of usable communication terminal apparatuses to the communication terminal apparatus among resources of the communication system that can be used by the communication terminal apparatus in its own cell. The base station apparatus according to claim 1.   The resource allocation determination means includes a resource usage rate of the communication terminal apparatus capable of using both a first communication system and a second communication system that uses different resources from the first communication system, and the second communication system. When the ratio of the resource usage rate of the communication terminal device that can use only the communication system is less than the threshold value, the resource of the first communication system for the communication terminal device that can use both systems. The base station apparatus according to claim 1, wherein the base station apparatus is preferentially assigned.   The resource allocation determining means includes the number of the communication terminal devices in communication that can use both the first communication system and the second communication system that uses different resources from the first communication system, and the second communication system. When the ratio with the number of communication terminal devices in communication that can use only the communication system is less than a threshold value, the first communication system is connected to the communication terminal device that can use both systems. The base station apparatus according to any one of claims 1 to 3, wherein resources are preferentially allocated.   The base station apparatus according to any one of claims 1 to 4, wherein the resource allocation determination unit allocates a frequency band as a resource to the communication terminal apparatus. Comprising instruction means for instructing the communication terminal apparatus the channel quality information reported by the communication terminal apparatus based on a communication system used by the communication terminal apparatus;
The base station apparatus according to claim 1, wherein the reception unit receives the line quality information instructed by the instruction unit to the communication terminal apparatus.   The instructing means preferentially reports the channel quality information of resources of a communication system having a small number of usable communication terminal devices among communication systems usable by communication terminal devices in its own cell. The base station apparatus according to claim 6, wherein an instruction is given to a terminal apparatus. A communication terminal apparatus that communicates with the base station apparatus according to claim 6 or 7,
The communication terminal device
Line information generating means for generating the line information instructed by the instruction means;
Reporting means for reporting the line information generated by the line information generating means;
A communication terminal apparatus comprising: A communication terminal apparatus that communicates with the base station apparatus according to any one of claims 1 to 7,
Line information generating means for generating preferentially from the line quality information of a communication system resource with few usable communication terminal devices;
Reporting means for reporting the line quality information generated by the line information generating means to the base station apparatus;
A communication terminal apparatus comprising: Receiving channel quality information which is information of channel quality with the communication terminal device;
Allocating resources to the communication terminal device based on information of the communication system and the channel quality information, which are different from each other in a plurality of resources used for communication with the communication terminal device;
Transmitting transmission data to the communication terminal apparatus using allocated resources;
A resource allocation method comprising:   11. A communication system resource having a smaller number of usable communication terminal devices among resources of a communication system usable by communication terminal devices in its own cell is preferentially allocated to the communication terminal device. The resource allocation method described.   Resource usage rate of the communication terminal device that can use both the first communication system and the second communication system that uses different resources from the first communication system, and only the second communication system can be used When the ratio of the resource usage rate of the communication terminal device is less than a threshold value, the resource of the first communication system is preferentially allocated to the communication terminal device that can use both systems. 12. The resource allocation method according to claim 10 or claim 11, wherein the resource allocation method is a resource allocation method.   The number of the communication terminal devices in communication that can use both the first communication system and the second communication system that use different resources from the first communication system, and only the second communication system can be used. When the ratio with the number of communication terminal devices in communication is less than a threshold value, the resources of the first communication system are preferentially allocated to the communication terminal devices that can use both systems. The resource allocation method according to claim 10, wherein:   The resource allocation method according to any one of claims 10 to 13, wherein a frequency band is allocated as a resource to the communication terminal device. Instructing the communication terminal apparatus the channel quality information reported by the communication terminal apparatus based on a communication system used by the communication terminal apparatus,
15. The resource allocation method according to claim 10, wherein the channel quality information instructed to the communication terminal apparatus is received.   Instructing the communication terminal apparatus to preferentially report the line information of the resources of the communication system having a small number of usable communication terminal apparatuses among the communication systems usable by the communication terminal apparatus in the own cell. The resource allocation method according to claim 15.

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