Communication terminal, base station unit and communication method

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a communication terminal device, a base station device and a communication method, and more particularly to a communication terminal device, a base station device and a communication method suitable for use in CDMA (Code Division Multiple Access) communication.

【0002】

[Conventional technology]

In a mobile communication system using a conventional CDMA system, there is FCSS (Fast Cell Site Selection) as a method in which a communication terminal device selects one base station device from a plurality of base station devices for communication. In FCSS, the communication terminal device compares the reception quality of known signals transmitted from a plurality of base station devices, and communicates with the base station device that has transmitted the known signal having the best reception quality.

【0003】

For example, when the communication terminal device measures the reception quality of a known signal, selects the base station that has transmitted the known signal with the highest reception quality, and changes the base station to communicate with, the known signal having the highest reception quality is again used. Sends a connection request to the base station device that sent.

【0004】

Then, the base station device determines the radio resource allocation and the communication method from the reception quality information of the known signal transmitted from the communication terminal device, and communicates with the communication terminal device. Here, the communication method indicates the setting of the signal transmitted by the base station device such as the modulation method of the signal to be transmitted, the coding rate, the diffusion rate in CDMA communication, and the number of multicodes.

【0005】

[Problems to be Solved by the Invention]

However, in the conventional device, the communication terminal device transmits the reception quality information of the known signal transmitted from the base station device of the communication partner to the base station device, and the known signal transmitted from the non-communication base station device. No signal reception quality information is transmitted to these base station devices. Then, when the partner base station device with which communication is performed is changed, the reception quality of the known signal of the base station device newly desired for communication is transmitted to this base station device.

【0006】

In the conventional device, when the propagation path fluctuates due to high-speed fading or the like, even if the communication terminal device measures and transmits the reception quality information of the known signal, when the base station device uses it, the propagation path of the propagation path The situation may have changed significantly, and the base station will decide the radio resource allocation and communication method from the reception quality information and perform communication, and it is not possible to set sufficient conditions for communication. , There is a problem that the signal transmitted by the base station device immediately after transmission is not correctly received by the communication terminal device.

【0007】

The present invention has been made in view of the above points, and in the communication between the base station device and the communication terminal device, the communication terminal device and the base capable of promptly determining an appropriate radio resource allocation and communication method for communication. It is an object of the present invention to provide a station device and a communication method.

【0008】

[Means for solving problems]

【0009】

The communication terminal device of the present invention comprises a reception quality measuring means for measuring the reception quality of known signals transmitted from a plurality of base station devices that are candidates for communication partners for each base station device, and reception quality of the known signals. A configuration is adopted that includes a transmission means for transmitting information for each base station device that has transmitted the known signal, and a selection means for selecting a base station device that is actually a communication partner from the plurality of base station devices. ..

【0010】

The base station apparatus of the present invention includes a transmitting means for transmitting a known signal, an averaging means for averaging information on reception quality based on the known signal transmitted from the communication terminal apparatus, and the communication terminal apparatus itself. When a station is selected as a communication partner, a configuration is adopted that includes a determination means for deciding a radio resource allocation and a communication method in communication with the communication terminal device based on the averaged reception quality information.

【0011】

According to these configurations, the communication terminal device transmits the reception quality information of the known signal for each base station device that has transmitted the known signal, and the base station device allocates wireless resources to the communication terminal requesting the connection and the communication method. By determining the radio resource allocation and communication method from the reception quality information of known signals including the past reception quality information, even when the propagation path changes rapidly due to high-speed fading, etc., the rapid propagation path The radio resource allocation and communication method can be determined in consideration of the influence of changes in.

【0012】

The communication terminal device of the present invention is a reception quality measuring means for measuring the reception quality of known signals transmitted from a plurality of base station devices which are candidates for communication partners for each candidate, and storage for accumulating the reception quality information. Means, selection means for selecting a base station device to actually communicate with from the plurality of base station devices, transmission means for transmitting reception quality information of the accumulated known signal to the selected base station device, and the like. The configuration is adopted.

【0013】

According to this configuration, the communication terminal device receives the known signals transmitted from a plurality of base station devices, and calculates and calculates the average value of the reception quality information of the known signals to each base station device that has transmitted the known signals. However, when the communication terminal device actually changes the base station device to be the communication partner, the base station device determines the radio resource allocation and the communication method by transmitting the accumulated reception quality information to the base station device. Therefore, in the communication between the base station device and the communication terminal device, it is possible to promptly determine an appropriate radio resource allocation and communication method for communication.

【0014】

Further, according to this configuration, since it is not necessary to perform the averaging calculation of the reception quality information in the base station device by performing the averaging calculation of the reception quality information in the communication terminal device, the configuration of the base station device is simplified. Can be converted.

【0015】

In the communication terminal device of the present invention, the storage means averages the reception quality information, and the transmission means transmits the averaged reception quality information to the base station device selected by the selection means.

【0016】

According to this configuration, the communication terminal device receives the known signals transmitted from a plurality of base station devices, and calculates and calculates the average value of the reception quality information of the known signals to each base station device that has transmitted the known signals. Then, when the communication terminal device actually changes the base station device to be the communication partner, the base station device determines the radio resource allocation and the communication method by transmitting the calculated average value to the base station device. Therefore, in the communication between the base station device and the communication terminal device, it is possible to promptly determine an appropriate radio resource allocation and communication method for communication.

【0017】

In the communication terminal device of the present invention, the storage means adopts a configuration in which the reception quality information is averaged according to the instruction transmitted from the base station device.

【0018】

According to this configuration, the base station apparatus instructs the parameters related to the averaging of the reception quality information, and the communication terminal apparatus calculates the average value of the reception quality information according to the instruction from the base station apparatus, thereby propagating differently. It is possible to average the reception quality information of known signals according to the road environment, and in the communication between the base station device and the communication terminal device, it is possible to promptly determine the appropriate radio resource allocation and communication method for communication. it can.

【0019】

The base station apparatus of the present invention determines a radio resource allocation and a communication method in communication with the communication terminal apparatus based on the transmission means for transmitting a known signal and the reception quality information transmitted from the communication terminal apparatus. A configuration is adopted that includes a determination means.

【0020】

According to this configuration, the communication terminal device actually receives the known signals transmitted from a plurality of base station devices and transmits the reception quality information of the known signals to each base station device that has transmitted the known signals. When changing the base station device to be the communication partner, the base station device can determine the radio resource allocation and the communication method from the reception quality information of the known signal transmitted in advance. In the communication of, it is possible to promptly determine an appropriate radio resource allocation and communication method and communicate.

【0021】

The base station apparatus of the present invention allocates radio resources in communication with a transmission means for transmitting a known signal and an averaging instruction and communication with the communication terminal apparatus based on reception quality information transmitted from the communication terminal apparatus. And a determination means for determining the communication method, and the configuration is adopted.

【0022】

According to this configuration, the base station apparatus indicates the averaging time of the reception quality information, and the communication terminal apparatus calculates the average value of the reception quality information according to the instruction from the base station apparatus, so that the reception quality information of different mobile stations can be averaged. When communicating according to the moving speed, the reception quality information of the known signal can be averaged according to the propagation path environment, and the radio can be promptly appropriate in the communication between the base station device and the communication terminal device. It is possible to determine the resource allocation and communication method for communication.

【0023】

In the communication method of the present invention, on the communication terminal device side, the reception quality of known signals transmitted from a plurality of base station devices that are candidates for communication partners is measured for each candidate, and the reception quality information is accumulated. A base station device that is actually a communication partner is selected from the plurality of base station devices, and the reception quality information of a known signal transmitted from the selected base station device is selected from the accumulated reception quality information. It is transmitted to the base station device, and the base station device side determines the radio resource allocation and the communication method in the communication with the communication terminal device based on the reception quality information so as to perform the communication.

【0024】

In the communication method of the present invention, on the communication terminal device side, the reception quality of known signals transmitted from a plurality of base station devices that are candidates for communication partners is measured for each candidate, and information on the reception quality of the known signals is obtained. Transmission is performed for each candidate, a base station device that is actually a communication partner is selected from the reception quality information, and communication with the communication terminal device is performed on the selected base station device side based on the reception quality information. The radio resource allocation and communication method in the above were decided and communication was performed.

【0025】

According to these methods, the communication terminal device actually receives the known signals transmitted from a plurality of base station devices and transmits the reception quality information of the known signals to each base station device that has transmitted the known signals. When changing the base station device to be the communication partner, the base station device can determine the radio resource allocation and the communication method from the reception quality information of the known signal received in advance. In the communication of, it is possible to promptly determine an appropriate radio resource allocation and communication method and communicate.

【0026】

BEST MODE FOR CARRYING OUT THE INVENTION

【0027】

The first gist of the present invention is to provide reception quality information of known signals to a plurality of base station devices that may perform communication in addition to the base station device that is communicating in the communication terminal device. The reception quality information of communication terminals other than the communication terminal that is transmitted to the base station equipment and communicates with the base station equipment is accumulated, and when a connection request is made from the communication terminal, the accumulated reception quality information is used as a wireless resource. Is to determine the allocation and transmission rate of.

【0028】

The communication terminal device receives the known signals transmitted from a plurality of base station devices, transmits the reception quality information of each known signal to each base station device, and the base station device accumulates the reception quality information. After averaging, when a connection request is received from the communication terminal, the resources and transmission rate (for example, modulation method, coding rate, diffusion rate or number of multi-codes) to be allocated to the communication terminal device are determined to communicate with the communication terminal device. Do.

【0029】

Further, the second gist of the present invention is to provide reception quality information of known signals to a plurality of base station devices that may perform communication in addition to the base station device that is communicating in the communication terminal device. When changing the base station that accumulates and communicates, the accumulated reception quality information is transmitted to the base station that requests the connection, and the base station that is requested to connect receives the accumulated reception quality information and wireless resources. It is to determine the allocation and communication method.

【0030】

The communication terminal device receives known signals transmitted from a plurality of base station devices, accumulates and averages the reception quality information of each known signal, and transmits the reception quality information accumulated in the base station requesting connection. The base station requested to connect determines the radio resource and transmission rate (for example, modulation method, coding rate, diffusion rate or number of multicodes) to be allocated to the communication terminal device by receiving the accumulated reception quality information. Communicates with the communication terminal device.

【0031】

(Embodiment 1) Next, the configuration of the communication terminal device according to the first embodiment of the present invention will be described. FIG. 1 is a block diagram showing a configuration of a communication terminal device according to a first embodiment of the present invention.

【0032】

In FIG. 1, the communication terminal device 100 is mainly composed of a plurality of CIR calculation units 101-1 to 101-n, a plurality of transmission units 102-1 to 102-n, and an antenna 103. The CIR calculation units 101-1 to 101-n are mainly composed of a complex correlation unit 110, a desired wave power measurement unit 111, an interference wave power measurement unit 112, and a division unit 113, respectively.

【0033】

The complex correlation unit 110 complexly multiplies a baseband signal, which is a frequency-converted known signal transmitted from a base station device that is a candidate for a communication partner, to a baseband frequency by a known pattern that distinguishes the signal of each base station device. Then, the amplitude value is obtained and output to the desired wave power measuring unit 111 and the interference wave power measuring unit 112.

【0034】

The desired wave power measuring unit 111 averages the amplitude values with a predetermined number of symbols and calculates the desired wave power value. Then, the desired wave power measuring unit 111 outputs the desired wave power value to the interference wave power measuring unit 112 and the dividing unit 113.

【0035】

The interference wave power measuring unit 112 calculates the interference wave power value by subtracting the amplitude value obtained from the desired wave power value from the received amplitude value, and outputs the interference wave power value to the dividing unit 113. The division unit 113 divides the desired wave power value by the interference wave power value to calculate the CIR value, and outputs the CIR value to the transmission unit 102-1.

【0036】

In this way, the CIR calculation units 101-1 to 101-n obtain the CIR value of the known signal transmitted from each base station device and output it to the transmission units 102-1 to 102-n. The transmission units 102-1 to 102-n perform processing necessary for wireless transmission such as coding, modulation, and frequency conversion on the CIR value information, and transmit the CIR value information via the antenna 103.

【0037】

Next, the configuration of the base station apparatus according to the first embodiment of the present invention will be described. FIG. 2 is a block diagram showing a configuration of a base station apparatus according to the first embodiment of the present invention. In FIG. 2, the base station apparatus 200 is mainly composed of an antenna 201, a receiving unit 202, a CIR extraction unit 203, an averaging unit 204, a transmission control unit 205, and a transmission unit 206.

【0038】

The receiving unit 202 receives the radio signal transmitted from the communication terminal device via the antenna 201, performs necessary processing for obtaining data such as conversion, demodulation, and decoding to the baseband frequency, and the obtained received signal. Is output to the CIR extraction unit 203. The CIR extraction unit 203 extracts the CIR information corresponding to the known signal transmitted by its own station from the received signal and outputs it to the averaging unit 204. The averaging unit 204 averages the CIR information in a predetermined time unit and outputs it to the transmission control unit 205.

【0039】

The transmission control unit 205 determines the allocation of radio resources and the transmission rate (for example, modulation method, coding rate, diffusion rate or number of multi-codes) from the averaged CIR information. The transmission unit 206 transmits data via the antenna 201 in a communication method output from the transmission control unit 205. Further, the transmission unit 206 transmits a known signal via the antenna 201.

【0040】

Next, the exchange of signals between the base station device and the communication terminal device will be described. FIG. 3 is a diagram showing communication exchanges between the base station device and the communication terminal device according to the first embodiment of the present invention. The communication terminal device 300 is mainly composed of the communication terminal device 100 described above. Further, the base station devices 320, 330 and 340 are mainly composed of the base station device 200 described above.

【0041】

In FIG. 3, the communication terminal device 300 obtains the desired wave to interference wave ratio (hereinafter referred to as CIR) value of the known signal PL321 received from the base station device 320, which is a candidate for the communication partner, and bases the obtained CIR322. Send to station device 320. Further, the communication terminal device 300 obtains the CIR value of the known signal PL331 received from the base station device 330, which is a candidate for the communication partner, and transmits the obtained CIR332 to the base station device 330. Further, the communication terminal device 300 obtains the CIR value of the known signal PL341 received from the base station device 340 which is a candidate for the communication partner, and transmits the obtained CIR 342 to the base station device 340.

【0042】

When the communication terminal device 300 starts communication with the base station device 320, the communication terminal device 300 receives the known signal PL321 transmitted from the base station device 320 selected as the communication partner, and the reception quality of the received known signal PL321. The information CIR322 is transmitted to the base station device 320. The base station device 320 determines the transmission rate of the radio resource or the signal to be transmitted from the CIR 322 to the communication terminal device 300, for example, the modulation method, the coding rate, the diffusion rate in the CDMA communication method, the number of multicodes, and the like, and obtains the data. Send to the communication terminal device.

【0043】

Further, when the communication terminal device 300 starts communication with the base station device 320, the communication terminal device 300 receives the known signal PL331 of the base station device 330 that has not started communication, and CIR332 which is the reception quality information of the known signal PL331. Is transmitted to the base station device 330. Similarly, CIR342, which is the reception quality information of the known signal PL341, is transmitted to the base station apparatus 340.

【0044】

When the communication terminal device 300 changes the selected communication partner from the base station device 320 to the base station device 330, the base station device 330 receives a communication request from the communication terminal device 300, and then the communication terminal device 300 has received a communication request in the past. From the CIR information transmitted from the CIR information, the transmission rate of the radio resource to be assigned to the communication terminal device 300 or the signal to be transmitted, for example, the modulation method, the coding rate, the spread rate in the CDMA communication method, the number of multicodes, etc. Send to the communication terminal device 300.

【0045】

FIG. 4 is a diagram showing the communication exchange between the communication terminal device and the base station device after changing the base station device for communication. In FIG. 4, the communication terminal device 300 starts communication with the base station device 330, and even after receiving data from the base station device 330, the base station device 320 and the base station device 340 receive the known signals PL321 and PL341, respectively. Continue to send quality information CIR322 and CIR342.

【0046】

As described above, according to the communication terminal device and the base station device of the present embodiment, the known signal transmitted from the plurality of base station devices is received, and the reception quality of the known signal is received by each base station device that has transmitted the known signal. When the communication terminal device changes the base station device that is actually the communication partner by transmitting the information, the base station device allocates radio resources and transmits the transmission rate from the reception quality information of the known signal transmitted in advance. Since it can be determined, it is possible to promptly determine and communicate an appropriate radio resource allocation and transmission rate in the communication between the base station device and the communication terminal device.

【0047】

(Embodiment 2) The communication terminal device of the second embodiment of the present invention provides reception quality information of known signals to a plurality of base station devices that may communicate with each other other than the base station device that is communicating. When each measurement is performed and the base station device of the communication partner is changed, the reception quality information measured in the past is provided to the base station device that desires communication, and the base station device provides the reception quality information transmitted from the communication terminal device. It communicates with the communication terminal device by deciding the allocation of wireless resources and the transmission rate from.

【0048】

FIG. 5 is a block diagram showing a configuration of a communication terminal device according to a second embodiment of the present invention. However, for those having the same configuration as that shown in FIG. 1, the same numbers as those shown in FIG. 1 are assigned, and detailed description thereof will be omitted.

【0049】

The communication terminal device 500 of FIG. 5 includes an averaging unit 501-1 to 501-n, a base station selection unit 502, and a transmission unit 503, and desires communication by averaging the reception quality information of known signals. It differs from the communication terminal device of the first embodiment in that reception quality information of a known signal transmitted from the base station device is selected and transmitted to the base station device.

【0050】

The CIR calculation units 101-1 to 101-n obtain the CIR value of the known signal transmitted from each base station device that is a candidate for the communication partner, and obtain the averaging unit 501-1 to 501-n and the base station selection unit 502. Output to.

【0051】

The averaging units 501-1 to 501-n average the CIR values of known signals in predetermined time units and output them to the base station selection unit 502. The base station selection unit 502 compares the CIR values output from the CIR calculation units 101-1 to 101-n, selects the base station device having the best CIR value, and provides information to be transmitted to the selected base station device. The averaged CIR value information corresponding to the selected base station is output to the transmitter 503.

【0052】

The transmission unit 503 uses the connection request between the selected CIR information and the selected base station device as a transmission signal, performs processing necessary for wireless transmission such as modulation, coding, and frequency conversion, and transmits the connection request via the antenna 103. ..

【0053】

Next, the exchange of signals between the base station device and the communication terminal device will be described. FIG. 6 is a diagram showing communication exchanges between the base station device and the communication terminal device according to the second embodiment of the present invention. The communication terminal device 600 is mainly composed of the communication terminal device 500 described above. Further, the base station devices 610, 620, and 630 determine the transmission rate of the radio resource to be assigned to the communication terminal device 600 or the signal to be transmitted from the CIR value transmitted from the communication terminal device 600, and transmit the data to the communication terminal device 600. It is a base station device.

【0054】

In FIG. 6, the communication terminal device 600 obtains the CIR value of the known signal PL611 received from the base station device 610, and calculates the average value of the CIR values. Further, the communication terminal device 600 obtains the CIR value of the known signal PL621 received from the base station device 620, and calculates the average value of the CIR values. Further, the communication terminal device 600 obtains the CIR value of the known signal PL631 received from the base station device 630, and calculates the average value of the CIR.

【0055】

When the communication terminal device 600 starts communication with the base station device 610, the communication terminal device 600 transmits the CIR 612, which is the average value of the CIR of the known signal PL611, to the base station device 610. The base station device 610 determines the transmission rate of the radio resource or the signal to be transmitted from the CIR 612 to the communication terminal device 600, for example, the modulation method, the coding rate, the diffusion rate in the CDMA communication method, the number of multicodes, and the like, and obtains the data. Send to the communication terminal device.

【0056】

Further, the communication terminal device 600 obtains the CIR value of the known signal PL621 received from the base station device 620 while starting communication with the base station device 610, and calculates the average value of the CIR values. Further, the communication terminal device 600 obtains the CIR value of the known signal PL631 received from the base station device 630, and calculates the average value of the CIR.

【0057】

When the communication terminal device 600 changes the communication partner from the base station device 610 to the base station device 620, the communication terminal device 600 transmits a communication request and a CIR value to the base station device 620.

【0058】

After receiving the communication request, the base station device 620 receives the communication request from the communication terminal device 600, and then allocates the radio resource to the communication terminal device 600 from the averaged CIR information transmitted from the communication terminal device 600. Alternatively, the transmission rate of the signal to be transmitted, for example, the modulation method, the coding rate, the diffusion rate in the CDMA communication method, the number of multicodes, and the like are determined, and the data is transmitted to the communication terminal device 600.

【0059】

FIG. 7 is a diagram showing communication exchange between the communication terminal device and the base station device after changing the base station device that performs communication. In FIG. 7, the communication terminal device 600 transmits the CIR 622 to the base station device 620, and the base station device 620 determines the radio resource allocation and the communication method from the CIR 622 and receives the data with the communication terminal device 600. Even after starting communication with the base station device 620, the average value of the reception quality information of the known signals PL611 and PL631 is calculated.

【0060】

As described above, according to the communication terminal device and the base station device of the present embodiment, the communication terminal device receives the known signals transmitted from the plurality of base station devices and calculates the average value of the reception quality information. When the calculated and communication terminal device actually changes the base station device to be the communication partner, the base station device determines the radio resource allocation and the communication method by transmitting the calculated average value to the base station device. Therefore, in the communication between the base station device and the communication terminal device, it is possible to promptly determine an appropriate radio resource allocation and communication method for communication.

【0061】

Further, according to the communication terminal device and the base station device of the present embodiment, it is necessary to perform the averaging calculation of the reception quality information in the base station device by performing the averaging calculation of the reception quality information in the communication terminal device. Since there is no such thing, the configuration of the base station device can be simplified.

【0062】

The averaging method is not particularly limited, and averaging using the forgetting coefficient or the like can be performed.

【0063】

Further, in the present embodiment, the reception quality information of the known signal is averaged, but the reception quality information may be accumulated and transmitted.

【0064】

(Embodiment 3) The base station apparatus according to the third embodiment of the present invention indicates a parameter (for example, averaging time) related to averaging of reception quality information calculated by the communication terminal apparatus, and the communication terminal apparatus is: In addition to the base station equipment that is communicating, the reception quality information of known signals is measured in advance for multiple base station equipment that may communicate, and the reception quality information is obtained according to the instructions from the base station equipment. When the average value is calculated and the base station device of the communication partner is changed, the averaged reception quality information is provided to the base station device that desires communication.

【0065】

FIG. 8 is a block diagram showing the configuration of the base station apparatus according to the third embodiment of the present invention. However, for those having the same configuration as that shown in FIG. 2, the same numbers as those shown in FIG. 2 are assigned, and detailed description thereof will be omitted. The base station apparatus 800 of FIG. 8 is different from the base station apparatus of the second embodiment in that it includes a transmission unit 801 and transmits an averaging instruction of reception quality information of known signals to the communication terminal apparatus.

【0066】

The transmission control unit 205 determines the allocation of radio resources and the transmission rate (for example, modulation method, coding rate, diffusion rate, or number of multicodes) from the CIR information output from the CIR extraction unit 203.

【0067】

The transmission unit 801 transmits data via the antenna 201 in the communication method output from the transmission control unit 205. Further, the transmission unit 801 transmits a known signal via the antenna 201. Further, the transmission unit 801 transmits an instruction of the averaging time information of the CIR value of the known signal to be transmitted.

【0068】

FIG. 9 is a block diagram showing a configuration of a communication terminal device according to a third embodiment of the present invention. However, for those having the same configuration as that of FIG. 1, the same numbers as those of FIG. 1 are assigned, and detailed description thereof will be omitted. The communication terminal device 900 of FIG. 9 includes extraction units 901-1 to 901-n and averaging units 902-1 to 902-n, and receives known signals according to an averaging instruction transmitted from the base station device. It differs from the base station apparatus of the second embodiment in that the quality information is averaged.

【0069】

The extraction units 901-1 to 901-n extract averaging instructions from the baseband signal whose received signal is frequency-converted to the baseband frequency, and output the averaging instructions to the averaging units 902-1 to 902-n, respectively. Further, the extraction units 901-1 to 901-n output the baseband signals to the CIR calculation units 101-1 to 101-n, respectively.

【0070】

The averaging units 902-1 to 902-n average the CIR values of the known signals with the averaging time of the instructions output from the extraction units 901-1 to 901-n and output them to the base station selection unit 502.

【0071】

As described above, according to the communication terminal device and the base station device of the present embodiment, the base station device indicates a parameter (for example, averaging time) related to averaging of received quality information, and the communication terminal device is a communication terminal device. By calculating the average value of reception quality information according to the instructions from the base station equipment, when there is a possibility of communicating with multiple base station equipment in different propagation path environments, a known signal corresponding to the propagation path environment It is possible to average the reception quality information of the above, and in the communication between the base station device and the communication terminal device, it is possible to promptly determine an appropriate radio resource allocation and communication method for communication.

【0072】

For example, when a base station communicates with communication terminal devices having different moving speeds, the averaging time required to determine an appropriate radio resource allocation and communication method in averaging reception quality information of known signals. Although different, the averaging time of the reception quality information of the known signal can be set for each communication terminal device by transmitting an appropriate averaging time for each communication terminal device.

【0073】

The communication terminal device of the present invention measures the CIR value of a known signal and transmits it to the base station device, and the base station device determines the radio resource allocation and the communication method from this CIR value. Not limited to this, any information indicating the reception quality of a known signal may be used. For example, it may be a SIR (Signal to Interference Ration) value or the like. In the above, the CIR is averaged, but the present invention can be used even if the CIR is not averaged, as long as it is a method using the past CIR.

【0074】

The radio resource allocation and communication method determined by the base station device from the reception quality information of the known signal is not limited to the modulation method of the signal to be transmitted, the coding rate, the diffusion rate in CDMA communication, and the number of multicodes. Any communication method that can determine is sufficient.

【0075】

Further, in the base station apparatus of the present invention, the radio resource and the transmission rate are allocated by predicting the change in the reception quality on the mobile station side from the difference between the received reception quality information and the reception quality information received immediately before. You can also do it. It is also possible to predict the tendency of changes in reception quality using a plurality of reception quality information and allocate radio resources and transmission rates.

【0076】

Further, in the mobile station apparatus of the present invention, reception quality information is accumulated, the difference between the current reception quality information and the previous reception quality information is obtained, and the information is transmitted to the base station apparatus. The base station device can also predict changes in reception quality from the difference in reception quality information sent from the mobile station device and allocate radio resources and transmission rates. Further, the base station apparatus can also use a plurality of reception quality information to predict the reception quality on the mobile station side, predict the tendency of the change in reception quality, and allocate the radio resource and the transmission rate.

【0077】

[Effect of the invention]

As described above, according to the communication terminal device, the base station device, and the communication method of the present invention, the known signal transmitted from the plurality of base station devices is received, and the known signal is sent to each base station device that has transmitted the known signal. When the communication terminal device changes the base station device that is actually the communication partner by transmitting the reception quality information of the above, the base station device promptly determines an appropriate radio resource allocation and transmission rate. It can communicate with the communication terminal device.

[Simple explanation of drawings]

[Figure 1]

A block diagram showing a configuration of a communication terminal device according to a first embodiment of the present invention. [Figure 2]

Block diagram showing the configuration of the base station apparatus according to the above embodiment [Fig. 3]

The figure which shows the communication exchange of the base station apparatus and the communication terminal apparatus which concerns on the said embodiment. [Fig. 4]

The figure which shows the communication exchange between the communication terminal apparatus and the base station apparatus after changing the base station apparatus which performs communication. [Fig. 5]

A block diagram showing a configuration of a communication terminal device according to a second embodiment of the present invention. [Fig. 6]

The figure which shows the communication exchange of the base station apparatus and the communication terminal apparatus which concerns on the said embodiment. [Fig. 7]

The figure which shows the communication exchange between the communication terminal apparatus and the base station apparatus after changing the base station apparatus which performs communication. [Fig. 8]

A block diagram showing a configuration of a base station apparatus according to a third embodiment of the present invention. [Fig. 9]

A block diagram showing a configuration of a communication terminal device according to the above embodiment. [Explanation of symbols]

101-1 ~ 101-n CIR calculation unit 102-1 ~ 102-n, 206, 503, 801 Transmitter 110 Complex correlation part 111 Desired wave power measurement unit 112 Interference wave power measurement unit 113 Division 202 Receiver 203 CIR extractor 204 Averager 205 Transmission control unit 501-1 ~ 501-n Averager 502 Base station selection section 901-1 ~ 901-n Extractor 902-1 ~ 902-n Averager