MXPA00006949A - Radio communication device and transmission antenna switching method - Google Patents

Abstract

A decision circuit (213) of a mobile station measures the number of passes of a down line;and, if the number of passes is smaller than a threshold value, it decides that an antenna switching operation must be performed, and otherwise decides that an antenna switching operation need not be performed. A multiplexing-circuit (214) multiplexes a control signal carrying the decision result of the circuit (213) with transmission data for transmitting. A base station separates a control signal from a reception signal and determines whether or not an antenna switching operation should be performed according to the descriptions of the control signal, thereby making it possible to perform a transmission antenna switching operation only when a transmission antenna switching can improve a reception quality and to minimize a transmission antenna switching requirement.

Description

APPARATUS FOR RADIO COMMUNICATION AND METHOD FOR CHANGE TRANSMISSION ANTENNA Technical Field The present invention relates to an apparatus for radio communication in a radio communication system, which performs radio transmissions using selective diversity, and further refers to a method for changing a transmission antenna.

BACKGROUND ART In recent years, spatial diversity has been adopted, in which a plurality of antenna leads (hereinafter simply referred to as "antenna") are provided in a base station apparatus to reserve a plurality of paths. As well as one of spatial diversity, there is selective diversity, which selects an optimal antenna according to a state of propagation. A method that uses selective diversity on the transmission side, hereinafter it is handled as a selective diversity of transmission. The selective diversity of transmission, is an apparatus for radio communication, TDD system (Time Division Duplex, ie Double Time Division), has already been described in the document "Tr ansmi ss ion Characteristics of Next Generation W-CDMA / TDD system (Report, SSE97-41, RCS 97-36 (1997- 06), the Institute of Electronics, Information and Communication Engineers) "and the like. This method is one in which, the correlation values are calculated on average over a previous slot (0.625 ms), to obtain reception energy for a communication channel, and an antenna having a higher reception energy is selected to perform slot transmission (0.625 ms) on a direct link. Thus, in the case of the radio communication device of the TDD system, which uses the same frequency on both direct and reverse links, a transmission antenna can be selected based on the reception energy of the reverse link. While, in the case of the radio communication device of the FDD system (Frequeney Division Duplex, ie Double Division of Frequency), which uses a different frequency in each of the reverse and direct links, this is because the antenna transmission can not be selected based on the reception energy of the reverse link; and the transmit antenna of a base station, is selected based on the energy of receiving a pre-slot control signal in a terminal apparatus. With respect to the selective diversity of transmission, in the conventional radio communication apparatus, of the FDD system, the following will exemplify the case of the CDMA system. First, the base station apparatus transmits a dispersion code control signal A from the antenna A, and a dispersion code control signal B from the antenna B. Then, a terminal apparatus measures the code reception energy of dispersion A, and that of dispersion code B, respectively; and reports the dispersion code having the highest reception energy, ie, an antenna number for the base station apparatus. The apparatus of the base station selects an antenna for the transmission of data to the terminal apparatus, based on the terminal device report. Here, in a communications system such as CDMA, which has a high resolution with respect to a delay wave, there is a case in which the RAKE combination is carried out, which combines the signals received each of which has a different arrival time, to improve reception performance. When the number of reception paths is large, the reception characteristic on the reception side is slightly improved by the RAKE combination characteristic, even if the transmission antenna was changed to the transmission side. On the other hand, if the transmission antenna is changed, the energy of reception of an interference signal will be greatly changed in the other terminal apparatus, so that the quality of reception will become worse. Therefore, in consideration of the entire system, it is desirable that the transmission antenna change be restricted to a minimum. However, the selective diversity of transmission, of the conventional radio communication device of the FDD system, has the problem that the antenna change is executed even when the receiving characteristic, on the receiving side, is slightly improved, that is, when the antenna change is unnecessary.

Description of the Invention A first objective of the present invention is to provide an FDD system radio communication apparatus, which executes the operation of changing a transmission antenna, only when the reception quality is improved by changing the transmission antenna, and providing a method for changing the transmission antenna. The above objective can be obtained by measuring the number of trajectories of a link from a delay profile of the received signal, and determining whether the operation for the antenna change is executed or not, considering the measured number of trajectories.

Brief Description of the Drawings Figure 1 is a block diagram showing a configuration of an apparatus for a base station, according to Mode 1 of the present invention; Figure 2 is a block diagram showing a configuration of a terminal apparatus according to Modality 1; Figure 3 is a view explaining a delay profile according to Modality 1; Figure 4 is a flow diagram showing the processing of a decision or decision circuit according to Modality 1; Figure 5 is a block diagram showing a configuration of an apparatus for a base station, according to Modality 2 of the present invention; Fig. 6 is a block diagram showing a configuration of a terminal apparatus according to Modality 2; Figure 7 is a block diagram showing a configuration of an apparatus for a base station according to Modality 3 of the present invention; Figure 8 is a block diagram showing a configuration of a terminal apparatus according to Modality 3; Figure 9 is a block diagram showing a configuration of a terminal apparatus according to Modality 4; and Figure 10 is a flow chart showing the processing of a decision or decision circuit according to Modality 4.

BEST MODE FOR CARRYING OUT THE INVENTION The embodiments of the present invention will be specifically explained with reference to the appended drawings.

(Modality 1) Modality 1 focuses on the point at which the diversity effect, which is caused by an antenna change, is small since the trajectory diversity effect, which is caused by the RAKE combination, it is obtained when the number of reception trajectories is large. More specifically, Modality 1 is a specific form in which the terminal apparatus measures the number of reception paths, from a received signal, to determine whether the antenna change needs to or not, based on the measured number of paths. , and transmits information which shows a determination or decision result towards an apparatus of a base station, and then the apparatus in the base station selects whether the antenna change, based on the determination result received in the terminal apparatus, is executed or it is not exempted. Figure 1 is a block diagram showing the configuration of the apparatus of the base station, according to the Modality 1 of the present invention. In the apparatus of the base station of Figure 1, an antenna duplexer 103 is used, in such a way that the same antenna is used in transmission and reception. The antenna duplexer 103 outputs a radio signal received by the antenna 101 to an RF receiving section 105, and is output to a signal leaving an RF transmission section 121 to the antenna 101. Similarly, a antenna duplexer 104 outputs a radio signal received by an antenna 102 to an RF reception section 106, and outputs a transmission signal from an RF transmission section 122 to antenna 102. RF reception sections 105 and 106, amplify incoming received signals from the antenna duplexers 103 and 104, a frequency converts the amplified signals to intermediate or baseband frequencies, and the signals are converted in frequency to adapted filters 107 and 108, respectively. The adapted filters 107 and 108 perform a joint by multiplying the output signals of the reception sections RF 105 and 106 by the same code D of conjunction, multiplied by the terminal apparatus, respectively. Then, the adapted filters 107 and 108 send the result to circuits 109, 110, which measure the delay profile and to a circuit or RAKE combination, respectively. The circuits that measure the delay profile 109, 110, measure the profiles of the output signals of the adapted filters 107 and 108, respectively, to obtain the arrival time of the signals of the respective paths and energy in each time of arrival. , and the information of the time of exit of the trajectories received by the combination circuit RAKE 111, respectively.

The RAKE combination circuit 111 synchronizes the time of the respective signals, each of which has a different arrival time coming out from the adapted filters 107 and 108, based on the time information of the reception paths leaving the measurement circuits of the delay profile 109 and 110, and combines these signals, and outputs a result to a circuit 112 for demodulation. The demodulation circuit 112 demodulates the output signal of the RAKE combination circuit 111, and outputs the demodulated signal to a separation circuit 113.

The separation circuit 113 separates a control signal from the output signal of the demodulation circuit 112, to extract the reception data, and picks up a necessary / unnecessary change signal, which shows whether an operation of antenna change is needed or not, and a selective antenna signal, which shows a transmission antenna number, and outputs the result to the antenna change control section 114 The control section of the antenna change 114 reads the necessary / unnecessary change signal from the separation circuit 113. Then, in a case where the antenna change operation is necessary, the antenna change control section 114 performs the antenna change operation, that is, the change of a selector 118 transmits the signal from the antenna, which is shown by the selective signal of antenna that leaves the separation circuit 113. A modulation circuit 115 provides primary modulation such as the PSK and secondary modulation, which multiplies the control signal A by the dispersion code A, to control the signal A, and outputs the result towards an adder 119. A modulation circuit 116 provides primary modulation such as the PSK and secondary modulation, which multiplies the control signal B by the scatter code B, to control the signal B, and outputs the result to an adder 120. A modulation circuit 115 provides primary modulation such as PSK and secondary modulation, multiplies the transmission data by dispersion code A, for the data of tra nsmission, and outputs the result to the selector 118. The selector 118 outputs the output signal of the modulation circuit 117 to the adder 119 or the adder 120 via the antenna change control circuit 114. The adder 119 or 120 multiplies the input signal, and outputs the multiplied signal to the RF transmission section 121 or 122, respectively. The RF transmission section 121 provides processing such as quadrature modulation, frequency conversion, amplification, and similar to the output signal of adder 119, and performs radio transmission from antenna 101 through antenna duplexer 103. Similarly, the RF transmission section 122 provides processing such as quadrature modulation, frequency conversion, amplification, and the like to the output signal of the adder 120, and performs radio transmission from the antenna 102 via the antenna duplexer 104.

Fig. 2 is a block diagram showing the configuration of the terminal apparatus according to Modality 1. In the terminal apparatus of Fig. 2, an antenna duplexer 102 is used so that the antenna is used in both receiving operations and transmission. The antenna duplexer 202 outputs a signal radio received by the antenna 201 to an RF reception section 203, and outputs a transmission signal that leaves from an RF transmission section 216 to the antenna 201. The RF reception section 203 amplifies a received signal from the antenna duplexer 202, the frequency converts the amplified signal to the intermediate or baseband frequency, and outputs the frequency-converted signal to the adapted filters 204, 205, and 206. The adapted filter 204 performs joining by multiplying the output signal of the frequency section. RF reception by dispersion code A, and outputs the result to an energy measurement circuit 210. Similarly, the adapted filter 205 performs the joining or multiplying the output signal of the RF receiving section by the scatter code B, and outputs the result to a circuit of energy measurement 211. The adapted filter 206 performs the connection or conjunction by multiplying the output signal of the RF receiving section 203 by the scatter code C, and outputs the result to a circuit 207 for measuring the delay profile and to a RAKE combination circuit 208. The circuit for measuring the delay profile 207 measures a delay profile of an output signal of the adapt filter 206 to obtain the arrival time of the respective trajectories and the energy at each arrival time, and it takes the information from the reception of the trajectories to a RAKE 208 combination circuit and to a determination or decision circuit 213. In the case in which the data is processed, nsmiten in a sudden way, the measurement of the profile is made with respect to the control signal. In this case, the profile measurement is made based on the output of the adapted filter 204 or 205. The RAKE combination circuit 208 synchronizes the time of the respective signals, each of which has a different arrival time of the adapted filter 206 , based on the time information of the reception of the path that leaves the delay profile measurement circuit 207, and combines these signals. A demodulation circuit 209 demodulates the output signal of the RAKE combination circuit 208 for the extraction of the received data. An energy measurement circuit 210 measures an output energy of the adapted filter 204, and outputs the measurement result to a comparison circuit 212. Similarly, an energy measurement circuit 211 measures the output energy of the adapted filter 205, and outputs the measurement result to the comparison circuit 212. The comparison circuit 212 compares the energy measured by the energy measurement circuit 210 with the energy measured by the energy measurement circuit 211, and generates a selective signal of antenna, which shows a higher dispersion code, ie, an antenna number of the base station apparatus, and outputs the result to a multiplexing circuit 214. The determinant circuit 213 measures the number of paths from the information time of the reception path, generates a necessary / unnecessary change signal, which shows if an operation to change the antenna is needed or not needed, this is , that the reception quality is improved by changing the antenna, and outputs the result to the multiplexing circuit 214. The multiplexing circuit 214 multiplies the necessary / unnecessary change signal that leaves the determination or decision circuit 213 and the selective signal of antenna that leaves the comparison circuit 212 within the transmission data in a structured format, and outputs the result to the modulation circuit 215. The modulation circuit 215 provides primary modulation such as the PSK and secondary modulation, which multiplies the signal output of the multiplexing circuit 214 by the conjunction code D, for the output signal of the multiplexing circuit 214, and outputs the result to an RF transmission section 216. The RF transmission section 216 provides processing such as modulation of quadrature, frequency conversion, amplification, and similar to the output signal of the desmodu circuit 215, and performs the radio transmission from the antenna 201 through the antenna duplexer 202. Next, a specific explanation of the processing is provided to measure the delay profile in the circuits for the measurement of the delay profile 109, 110 of Figure 1, and the circuit for measuring the delay profile 207 of Figure 2, with reference to the drawings illustrating an example of the delay profile of Figure 3. In Figure 3, a horizontal axis denotes time, and a vertical axis denotes energy. In radio communications, there is a delay wave in which the transmitted signal reaches the receiving side. after being reflected on a mountain, a building, and the like in addition to its addition to a direct wave in which the transmitted signal arrives directly at the receiving side. Figure 3 shows that a direct wave energy signal pO arrives at a time tO, and the delay wave signals pl, p2, p3, arrive at times ti, t2, t3, respectively. The circuits for measuring the delay profile 109 and 110 and the circuit for measuring the delay profile 207 measure the delay profile as shown in figure 3, to obtain the number of trajectories, in which the energy is greater than a present threshold value, and the arrival time of each trajectory. In the case of Figure 3, since the energy of the signal received at time tO and time ti is greater than the threshold value, the number of paths is set to 2. An explanation of the determination process or circuit decision for this purpose 213 of example 1, with reference flow diagram of figure 4. First, the decision or decision circuit 213 determines whether the number of trajectories from the circuit to measure the delay profile 207, is less than present threshold value (ST11). If the number of trajectories is less than the present threshold value, the decision or decision circuit 213 generates the necessary / unnecessary change signal having information for effect that the operation of changing an antenna is necessary (ST12). On the other hand, if the number of trajectories is greater than or equal to the present threshold value, the determination or decision circuit 213 generates the necessary / unnecessary change signal having information for the operation effect of the antenna change is unnecessary ( ST13). For example, in a case in which the present threshold value is "3", and the delay profile shown in Figure 3 is measured by circuit 207 to measure the delay profile, the number of paths to be introduced into the circuit determinant or decision 213 is "2", which is smaller than the threshold value "3". Therefore, the decision or decision circuit 213 generates the necessary / unnecessary change signal, which has the information that the operation of the antenna change is necessary, and outputs this signal to the multiplexing circuit 214. Then, provides an explanation of the flow of the reverse link signal in the radio communications system of Mode 1. The multiplexing circuit 214 multiplies the necessary / unnecessary change signal and the antenna selective signal in the transmission data from the apparatus. terminal in the structured format, and the modulation circuit 215 provides primary modulation such as the PSK and secondary modulation, which multiplies the output signal of the multiplexing circuit 214 by the conjunction code or union D, for the output signal of the circuit multiplexing 214. The RF 216 transmission section provides processing such as quadrature modulation, conversion frequency, amplification and the like to the output signal of the demodulation circuit 215, and performs radio transmission from the antenna 201 by the antenna duplexer 202. The radio signals transmitted from the antenna 201 of the terminal apparatus are received by the antennas 101 and 102 of the base station apparatus. The signal received by the antenna 101 is input to the reception circuit RF 105 through the antenna duplexer 103, and the input signal is amplified and the frequency is converted to intermediate or baseband frequency, by means of the RF reception circuit 105. The output signal of the reception circuit 105 is linked by means of the adapted filter 107 using the conjunction code D, and the joined signal is output to the delay profile measurement circuit 109 and the combination circuit RAKE 111. The circuit to measure the delay profile 109 measures the profile of the output signal of the adapted filter 107 to obtain the arrival time of each energy and reception path at each arrival time, and extracts the time information from the reception path to the RAKE 111 combination circuit Similarly, the signal received by the antenna 102 is input to the RF reception circuit 106 through the antenna duplexer 104, and the input signal is amplified and the frequency is converted to intermediate or baseband frequency by the reception circuit RF 106. The output signal of the RF receiving circuit 106 is joined by the adapted filter 108 using the joining code D, and the joined signal is output to the measuring circuit of the delay profile 110 and the RAKE combination circuit 111. The circuit for measuring the delay profile 110 measures the profile of the output signal of the adapted filter 108 to obtain the arrival time and energy of each reception path at each arrival time, and extracts the time information from the reception path to the RAKE combination circuit 111. The RAKE combination circuit 111 combines the respective signals each of which has different arrival times, and the demodulation circuit 112 demodulates the combined signals , and the separation circuit 113 separates the necessary / unnecessary signal change signal and the antenna selective signal for the extraction of the received data. The separate necessary / unnecessary signal and the antenna selective signal are output to the antenna change control circuit 114. The antenna change control circuit 114 determines whether an antenna change is executed or not based on the signal needed. / unnecessary . Then then, if the antenna change is executed, the selector 118 is changed based on the antenna selective signal. Next, an explanation of the flow of the direct link signal in the radio communications system of Mode 1 is provided. The control signal A transmitted from the base station apparatus is subjected to a primary processing such as the PSK by the modulation circuit 115. On the other hand, the secondary modulation processing of the dispersion processing using the scatter code A, is also provided, and the result is output to the adder 119. Similarly, the control signal B transmitted from the The base station apparatus is subjected to primary processing such as the PSK by means of the modulation circuit 116. In addition, the secondary modulation processing of the dispersion processing using the scatter code B is also provided, and the result is output to the adder 119. The direct link transmission data transmitted from the base station apparatus is subjected to the procedure such as the PSK by means of the modulation circuit 117. On the other hand, the secondary modulation processing of the dispersion processing using the scatter code C is also provided, and the result is output to the adder 119 or 120 to through selector 118, and control signals A and B are multiplied. The RF transmission section 121 provides processing such as quadrature modulation, frequency conversion, amplification, and the like to the output signal of the adder 119, and performs the radio transmission from the antenna 101 via the antenna duplexer 103. The RF transmission section 122 provides processing such as quadrature modulation, frequency conversion, amplification, and the like to the output signal of adder 120, and performs radio transmission from antenna 102 by antenna duplexer 104. The signals of radio transmitted from antennas 101 and 102 of the base station apparatus are received by antenna 201 of the terminal apparatus. The signal received by the antenna 201 is input to the RF receiving circuit 203 via the antenna duplexer 202. The input signal is amplified, and the frequency is converted to intermediate frequency or baseband frequency, and the signal converted to frequency is input to the adapted filters 204, 205 and 206. The adapted filter 206 provides for conjunction processing or joining to the input signal that it also uses the scatter code C, and outputs the result to the delay profile measurement circuit 207 and the combination circuit RAKE 208. The circuit for measuring the delay profile 207 measures the delay profile of the output signal of the adapted filter 206 to obtain the arrival time of each energy and reception path at each arrival time, and extracts time information from the reception path to the RAKE combination circuit 208 and the decision or decision circuit 213. The RAKE combination circuit 208 combines the respective signals, each of which has a different arrival time, and the demodulation circuit 209 demodulates the combined signals to extract the received data. The decision or decision circuit 213 measures the number of trajectories from the time information of the reception path and generates the necessary / unnecessary change signal based on the number of measured paths, and outputs the result to the multiplexing circuit 214.

The adapted filter 204 provides conjunction processing or joining to the input signal which also uses the scatter code A. then, the energy measuring circuit 210 measures the energy, and the result of the measurement is sent to the comparison circuit 212 Similarly, the adapted filter 205 provides conjunction processing or joining to the input signal which also uses the dispersion code B. Then, the energy measuring circuit 211 measures the energy, and the result of the measurement removes it to the comparison circuit 212. The comparison circuit 212 compares the energy measured by the energy measurement circuit 210, with the energy measured by the energy measurement circuit 211, generates the antenna selective signal, which shows the dispersion code greater, that is, the antenna number of the base station apparatus, and outputs the result to the multiplexing circuit 214. Thus, in the case where the number of trajectories is small, the propagation path is selected to execute the antenna change, and this makes it possible to improve the reception quality. While, for the case in which the number of trajectories is large, the trajectory diversity effect can be obtained, which is caused by the RAKE combination. As a result, the control is performed to prevent the antenna from being changed, and this makes it possible to prevent a sudden change in the interference energy for the other terminal apparatus caused by the antenna change, and to suppress the deterioration in the quality of the antenna. reception of the other terminal device. (Mode 2) Modality 2 is a specific form in which the terminal apparatus measures the number of receive paths from the received signal, transmits information, which shows the number of paths, towards a base station, and the station The base determines whether the antenna change is needed or not based on the number of paths received from the terminal apparatus, and selects whether the antenna change is executed or not based on the result of the termination. Figure 5 is a block diagram showing the configuration of the base station apparatus according to Modality 2 of the present invention. The apparatus of the base station of Figure 5 adopts the configuration in which a determination or decision circuit 301 is added to the apparatus of the base station of Figure 1. In the apparatus of the base station of Figure 5, there are added the same reference numbers to those in Figure 1, for the configuration portions, which are common to those of the base station apparatus of Figure 1 in relation to the operation, and therefore the explanation is omitted. The separation circuit 113 separates the control signal from the output signal of the demodulation circuit 112 to extract the received data, captures the time information of the reception path and the antenna selective signal from the control signal, removes the time information from the reception path to the determination or decision circuit 301, and outputs the antenna selective signal to the antenna change control circuit 114. The decision or decision circuit 301 measures the number of paths to starting from the time information of the reception path that leaves from the separation circuit 113, and generates the necessary / unnecessary change signal based on the number of paths, and sends the result to the antenna change control circuit 114. The antenna change control circuit 114 reads the necessary change signal / unnecessary that comes from the determination or decision circuit 301. Then, in the case in which the operation for the antenna change is necessary, the antenna change control section 114 performs the change of a selector 118 to transmit the signal from the antenna, which is shown by the selective antenna signal exiting from the separation circuit 113. Figure 6 is a block diagram showing the configuration of the terminal apparatus according to Modality 2 of this invention. The terminal apparatus of Figure 6 adopts the configuration in which the determining circuit 213 is removed from the terminal apparatus of Figure 2. In the apparatus of the base station of Figure 6, the same reference numbers are added to those of the figure 2, to the configuration portions, which are common to the base station apparatus of figure 2, in relation to the operation, and therefore the explanation is omitted. The circuit for measuring the delay profile 207 measures the delay profile of the output signal of the adapted filter 206, to obtain the arrival time of each path and energy in each time of arrival. Then, the measurement circuit of the delay profile 207 extracts the time information from the reception path to the combination circuit RAKE 208 and the multiplexing circuit 214. The multiplexing circuit 214 multiplies the time information of the reception path , which has been removed from the measurement circuit of the delay profile 207; and the selective antenna signal, which has been taken out of the comparison circuit 212, places it in the transmission data in the structured format, and outputs the result to the demodulation circuit 215.

Thus, the apparatus of the base station determines whether the antenna change is executed or not based on the number of reception paths measured by the terminal apparatus. This makes it possible to reduce the scale of physical equipment (hardware) or of the set of software (software) of the terminal apparatus, and to improve the miniaturization of the terminal apparatus and decrease the energy consumption.

(Modality 3) Modality 3 focuses on the point at which the delay profile of the terminal apparatus and that of the base station apparatus are substantially the same. More specifically, Modality 3 is a specific form in which the base station apparatus measures the number of receive paths from the received signal, determines whether the antenna change is needed or not based on the number of paths measured. , and selects whether the antenna change is executed or not based on the result of the determination.

Figure 7 is a block diagram showing the configuration of the base station apparatus according to Modality 3 of the present invention. The apparatus of the base station of FIG. 7 adopts a configuration in which the decision or decision circuit 401 is added to the apparatus of the base station of FIG. 1. In the apparatus of the base station of FIG. they add the same reference numbers to those of Figure 1, to the configuration portions, which are common to the apparatus of the base station of Figure 1 in relation to the operation, and therefore the explanation is omitted.

The circuits for measuring the delay profile 109 and 110 measure the delay profiles of the output signals of the adapted filters 107 and 108, respectively, to obtain the time of arrival of the signal of each path and energy in each time of arrival, and outputs the time information of the reception path to the RAKE combination circuit 111 and the determination circuit 401, respectively. The determining or decision circuit 401 measures the number of paths from the time information of the reception path, which has been taken out of the delay profile measurement circuits 109 and 110, generates the necessary change signal / is based on measured number of trajectories, and outputs the result to the antenna change control circuit 114. The antenna change control circuit 114 reads the necessary / unnecessary signal that leaves the determinant circuit or decision 401. Then, if the operation of the antenna change is needed, the antenna change control circuit 114 performs the change of the selector 118 to transmit the signal from the antenna, which is shown by the selective antenna signal from the separation circuit 113. Figure 8 is a block diagram showing the configuration of the terminal apparatus according to Modality 3 of the present invention. The terminal apparatus of Fig. 8 adopts the configuration in which the decision or decision circuit 213 is deleted from the terminal apparatus of Fig. 2. In the apparatus of the base station of Fig. 8, the same reference numerals are added to those of figure 2, to the configuration portions, which are common to the apparatus of the base station of figure 2 in relation to the operation, and the explanation is omitted. The circuit for measuring the delay profile 207 measures the delay profile of the output signal of the adapted filter 206 to obtain the arrival time of each path and energy in each arrival time, and it extracts the time information from the trajectory of reception to the RAKE combination circuit 208. The multiplexing circuit 214 multiplies the antenna selective signal, which has been taken from the comparison circuit 212, in the transmission data in the structure format, and outputs the result to the modulation circuit 215. Thus, attention is paid to the point where the delay profile of the terminal apparatus, and that of the base station apparatus are substantially the same. Then, the base station apparatus measures the number of reception paths and determines whether the antenna change is executed or not. this makes it possible to reduce the scale of hardware (hardware) or the set of programs (so ftware), improve the miniaturization of the terminal apparatus and decrease the energy consumption. (Mode 4) Mode 4 focuses on the point at which the effect of transmission diversity is small, since the length of time in which the continuously received signal falls short when the Doppler frequency is high. More specifically, Modality 4 is a specific form in which the terminal apparatus measures the number of reception paths and the Doppler frequency of the received signal, and transmits the information, which shows the number of paths and the Doppler frequency, to the device of the base station, and the base station apparatus determines whether the antenna change is needed or not, based on the number of paths and the Doppler frequency received from the terminal apparatus, and selects whether the antenna change is executed or not based on the result of the determination or decision. Figure 9 is a block diagram showing the configuration of the terminal apparatus according to Modality 4 of the present invention. The terminal apparatus of Fig. 9 adopts a configuration in which a circuit for measuring the Doppler frequency is added to the terminal apparatus of Fig. 2. In the apparatus of the base station of Fig. 9, the same reference numerals are added. to those of Figure 2, to the configuration portions, which are common to those of the base station apparatus of Figure 2 in relation to the operation, and thus the explanation is omitted. The adapted filter 206 performs the conjunction by multiplying the output signal of the RF receiving section 203 by the conjunction code or union C, and outputs the result to the circuit for measuring the delay profile 207, the RAKE combination circuit 208, and the circuit to measure the Doppler frequency 501.

The circuit for measuring the Doppler frequency 501 measures the Doppler frequency of the output signal of the adapted filter 206, and outputs the result of the measurement to the determinant circuit 213. It should be noted that the method for measuring the Doppler frequency has already been proposed in the Document "Basics of Mobile Communications" (published on October 1, 1986, the Institute of Electronics, Information and Communications Engineers) and the like.

The decision or decision circuit 213 measures the number of trajectories from the time information of the reception path, which has been taken out of the measurement circuit of the delay profile 207, generates the necessary / unnecessary signal of change based on the number of trajectories and the Doppler frequency measured by the Doppler frequency measurement circuit 501, and outputs the result to the multiplication circuit 214.

An explanation of the circuit determination or decision process for this purpose 213 of Mode 1 is given below with reference to the flow chart of Fig. 10.

First, the determination or decision circuit 213 determines or decides whether the number of trajectories entering from the measurement circuit of the delay profile 207 is smaller than the present threshold value of 1 (ST21). If the number of paths is less than the threshold value of 1, the determining circuit 213 decides whether the input Doppler frequency of the Doppler frequency measurement circuit 501 is less than the present threshold value of 2 (ST22). If the Doppler frequency is lower than the present threshold value of 2, the determining circuit 213 generates the necessary / unnecessary change signal to make the operation for the antenna change necessary (ST23). If the number of trajectories is greater than or equal to the threshold value of 1, and the Doppler frequency is greater than or equal to the present threshold value of 2, the determining circuit 213 generates the necessary / unnecessary change signal so that the operation of Antenna change is unnecessary (ST24). Thus, in the case where the number of trajectories is small and the frequency offset is small, the propagation path is selected to execute the antenna change, and this makes it possible to improve the quality of the reception. While, in the case where the number of trajectories is large, or the frequency shift is large, it is possible to obtain the trajectory diversity effect, which is caused by the combination RAKE,. As a result, the control works to prevent the antenna from being changed, and this makes it possible to prevent a sudden change in the interference energy to the other terminal apparatus caused by the antenna change, and thus to suppress deterioration in the reception quality of the antenna. another terminal device. The configuration and operation of the base station apparatus of Modality 4 are the same as those of Figure 1, and therefore the explanation is omitted. In addition, Modality 4 can be combined with Modality 2 or Modality 3. Specifically, the following combinations can be executed. Specifically, the terminal apparatus measures the number of paths and the Doppler frequency, and the apparatus of the base station determines whether the antenna change is needed or not. The base station apparatus measures the number of trajectories and the Doppler frequency, and determines whether the antenna change is needed or not. The terminal apparatus measures the number of trajectories, and the base station apparatus measures the Doppler frequency and determines whether the antenna change is needed or not. The terminal apparatus measures the Doppler frequency, and the base station apparatus measures the number of paths and determines whether the antenna change is needed or not.

As explained below, according to the apparatus for radio communication and the method for radio communication of the present invention, the antenna change can be made in time, which serves as a starting point, when the quality of the reception becomes worse. On the other hand, in the case where the effect of improving the quality of reception, which is caused by the antenna change, is small; the operation of the antenna change is stopped in such a way that the change in the amount of interference for the other terminal apparatus can be eliminated.

This application is based on Japanese Patent Application No. HEI 10-328293 filed on November 18, 1998, the entire contents of which is hereby incorporated expressly for reference purposes. It is noted that in relation to this date, the best method known to the applicant, to carry out the aforementioned invention, is that which is clear from the present description of the invention. Having described the invention as above, property is claimed as contained in the following:

Claims (21)

1. An apparatus for radio communications characterized in that it comprises: a first means for measuring trajectory, for measuring the number of trajectories of a direct link; a first means of determination or decision, to determine whether the antenna change operation is needed or not, based on the number of paths; and a first means for multiplying a first control signal, which then puts a determination result of said first determination means, in the transmission data.

2. The radio communications apparatus according to claim 1, characterized in that the first means for determining or deciding determines that the operation for the antenna change is needed when the number of direct link paths is less than a first threshold value.

3. The radio communication apparatus according to claim 1, further comprising a first means for measuring a Doppler frequency for measuring the Doppler frequency of a received signal, wherein the first determining means decides whether the antenna change operation is needed. or not, based on the number of trajectories of the direct link and the Doppler frequency.

4. The radio communication apparatus according to claim 3, characterized in that the first means for determining, decides that the execution of the antenna change operation is needed, when the number of direct link paths is lower than the first threshold value, and the Doppler frequency is lower than the second threshold value, which is present.

5. An apparatus for radio communications, characterized in that it comprises: a first means for measuring the number of trajectories, for measuring the number of trajectories of a direct link; and a second multiplexing means for multiplying a second control signal, which then places information that shows the number of direct link paths, in the transmission data.

6. The radio communication apparatus according to claim 5, characterized in that it further comprises a first means for measuring the Doppler frequency, for measuring the Doppler frequency of a received signal, wherein said second multiplexing means multiplies said second control signal, the which then puts information that shows the number of trajectories of the direct link, in a third control signal, which puts information that shows the Doppler frequency, in the data of t rans isi ón.

7. A terminal apparatus for communications, having an apparatus for radio communications over it, characterized in that said apparatus for radio communications comprises: a first means for measuring trajectory, for measuring the number of trajectories of a direct link; a first means for determining or deciding, which determines whether the antenna change operation is needed or not, based on the number of trajectories; and a first multiplexing means, for the multiplication of a first control signal, which then puts a determination result of said first determination means, in the transmission data.

8. An apparatus for radio communications characterized in that it comprises: a first means for separation to separate a first control signal from a received signal; and a first means for controlling changes, to determine whether or not an antenna change operation is executed based on the first control signal.

9. An apparatus for radio communications characterized in that it comprises: a second means for separation, for separating a second control signal from a received signal; a second means for determining or deciding, which determines whether an antenna change operation is executed or not, based on said second control signal; and a second means for controlling changes, to determine whether an antenna change operation is needed or not, based on the result of the determination of said second means of determination.

10. The apparatus for radio communications according to claim 9, characterized in that said second means of determination or decision, determines that the antenna change operation is needed when the number of paths of a direct link is lower than the first threshold value, which is I presented.

11. The apparatus for radio communications according to claim 9, characterized in that the second means for separation separates a second control signal and a third control signal from a received signal, and the second means determines whether the antenna change operation is it needs or not, based on said second control signal and third control signal.

12. The radio communication apparatus according to claim 11, characterized in that said second determining means decides that the execution of the operation of the antenna change is needed, when the number of paths of a direct link is lower than the first threshold value, which is present, and the Doppler frequency is lower than a second threshold value, which is present.

13. An apparatus for radio communications characterized in that it comprises: a second means for measuring trajectories for measuring the number of paths of a reverse link; a third means for determination, to determine whether an antenna change is needed or not, based on the number of paths of the reverse link; and a third means for controlling a change, to determine whether a transmission antenna change operation is executed or not, based on a determination result of said third means of determination or decision.

14. The apparatus for radio communications according to claim 13, characterized in that the third means to determine or decide, determines that the execution of the antenna change operation is needed, when the number of paths of the reverse link is less than a third value threshold, which is present.

15. The apparatus for radio communications according to claim 13, further characterized in that it comprises a second means for measuring the Doppler frequency, for measuring a Doppler frequency of a received signal, wherein said third means for determination or decision, decides whether the change of The antenna is needed or not, based on the number of paths of the direct link and the Doppler frequency.

16. The apparatus for radio communications according to claim 13, characterized in that said third means for determining, determines that the antenna change is needed, when the number of paths of the forward link is lower than the third threshold value, which is present, and the Doppler frequency is less than a fourth threshold value, which is present.

17. An apparatus for a base station, having an apparatus for radio communications over it, said apparatus for radio communications is characterized in that it comprises: a first means for separating, for separating a control signal from a received signal; Y a first control means for determining whether the operation of the antenna change is executed or not, based on the first control signal.

18. A method for changing a transmission antenna characterized in that it comprises the steps of: measuring the number of paths of a link; determine if the operation of the antenna change is executed or not, based on the measured number of trajectories; Y operating the shift control to determine whether a change operation of a direct transmission data transmission antenna is executed or not, based on a determination result of said determination step.

19. The method for changing the transmission antenna according to claim 18, characterized in that it determines in said determination step, that the execution of the operation of the antenna change is needed, when the number of paths of the link is less than one. first threshold value, which is present.

20. The method for changing the transmission antenna according to claim 18, characterized in that it further comprises a step of measuring a Doppler frequency of a received signal, wherein said determination or decision step determines whether the antenna change operation is needed or not, based on the number of trajectories of the link and the Doppler frequency.

21. The method for changing transmission antenna according to claim 20, characterized in that it determines in said determination step, that the execution of the antenna change operation is needed when the number of link paths is less than a first threshold value, which is present, and the Doppler frequency is lower than a second threshold value, which is present.