JP2005176160A - Transmitting method, base station device using the same, receiving method, and terminal apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To keep a waiting state in a terminal apparatus even when antenna directivity in announcing an alert signal is changed. <P>SOLUTION: A signal processing part 18 performs a signal processing required for an exchange processing by an adaptive array antenna. An antenna 14 for a base station performs the exchange processing concerning a radio frequency signal. A changeover part 26 externally includes an interface so as to receive an indication whether an antenna pattern in announcing the alert signal is made to be directional or nondirectional. A threshold generating part 28 sets a waiting zone holding level, based on the indication received by the changeover part 26, and generates a directivity transmission flag. An information generating part 30 sets the waiting zone holding level and the directivity transmission flag, which are set by the threshold generating part 28, in the alert signal. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a transmission technique and a reception technique, and more particularly to a transmission method for maintaining a standby state, a base station apparatus using the transmission method, a reception method, and a terminal apparatus using the transmission method.

  In a mobile phone system and a simple mobile phone system, a terminal device is connected to a base station device connected to a network, and communication is performed between the network and the terminal device. Furthermore, another base station device is also connected to the network, and communication such as a call is performed between a plurality of terminal devices respectively connected to the plurality of base station devices. On the other hand, the terminal device waits for a call request from another terminal device, that is, an incoming call while not making a call (hereinafter, a state waiting for an incoming call is simply referred to as “standby state”). If this is described as the operation of the terminal device, the terminal device transitions to the standby state if the standby zone selection level, global definition information, and local definition information standby transition conditions are satisfied after synchronization is established with an arbitrary control channel. It can be said that.

  In the standby state, a level difference between a preset standby zone holding level and a reception level is obtained, and whether or not there is a zone shift is determined. If BCCH is received and there is a change in global definition information and local definition information, an operation corresponding to the change content is performed. When an incoming call is received on the PCH or a terminal device is called, a call connection operation is performed. That is, in order for the terminal device to maintain a standby state, the terminal device generally confirms that it exists in an area where communication with the base station device is possible.

In the standby state, the location registration operation is necessary for the above-described network to identify the base station device connected to the terminal device. However, the terminal device transitions to a new standby state, and performs the LCCH superframe. When synchronization is established, the location registration sequence is activated. Such location registration activation is performed in the case where the location registration information of the base station device that succeeded in the location registration is not stored or in synchronization with the location registration information of the base station device that succeeded in the location registration at the end. This is performed when the location registration information of the base station apparatuses being different is different. (For example, refer nonpatent literature 1).
The Japan Radio Industry Association, “Second Generation Cordless Telephone System Standard”, Third Edition, RCR STD-28, The Japan Radio Industry Association, p. 702-703

  As described above, the terminal device compares the standby zone holding level with the reception level in order to maintain the standby state, and the reception level is obtained by measuring a notification signal notified from the base station device. Generally, since it is desirable that the broadcast signal is received with equal probability in all directions centering on the base station apparatus, the broadcast signal is transmitted with an omnidirectional antenna pattern. On the other hand, base station apparatuses that adaptively change antenna patterns with a plurality of antennas have been developed for the purpose of improving communication characteristics and increasing transmission capacity. Since an antenna pattern of a signal transmitted from such a base station apparatus is generally calculated from a received signal, an adaptive antenna pattern cannot be generated with a broadcast signal without a corresponding received signal. . Although it is not an adaptive antenna pattern, it is possible to reduce the transmission power per antenna by transmitting a broadcast signal while automatically changing the directivity at a predetermined interval, thereby reducing the cost and size of the device. To do. However, in a terminal device that receives such a notification signal, the reception level of the signal greatly fluctuates, so that the reception level tends to be lower than the standby zone retention level, making it difficult to maintain the standby state.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a transmission method that maintains a standby state even when a variation in reception level is large, a base station apparatus using the transmission method, a reception method, and a transmission method thereof. It is to provide a used terminal device.

  One embodiment of the present invention is a base station apparatus. In order to make the terminal device in the standby state determine whether to maintain the standby state, this device notifies the notification signal that the terminal device should measure the reception intensity with an omnidirectional or predetermined directional antenna pattern. And a notification unit that notifies the terminal device of a threshold value to be compared with the reception intensity of the notification signal measured by the terminal device, and a generation unit that generates the threshold value. In this apparatus, when the notification unit notifies the notification signal with a directional antenna pattern, the notification unit changes the directivity at a predetermined interval, and the generation unit notifies the notification signal with a non-directional antenna pattern. The threshold value when the notification signal is notified with a directional antenna pattern and changing the directivity at a predetermined interval may be made smaller than the threshold value.

The “nondirectional or predetermined directional antenna pattern” does not need to be selected when the notification signal is notified, and the notification signal may be notified using only one of the directional antenna patterns, for example.
With the above device, when notifying the notification signal with a directional antenna pattern while changing the directivity at a predetermined interval, in order for the terminal device to lower the threshold and determine the standby state, It is easy to maintain a standby state in the terminal device.

  When the broadcast signal is broadcast with a non-directional antenna pattern as a threshold when the broadcast signal is broadcast with a directional antenna pattern and the directivity is changed at a predetermined interval A first signal having the same value as the threshold value and a second signal indicating an instruction to lower the value of the first signal may be generated. The notification unit may notify by including a threshold value in the notification signal.

  Another aspect of the present invention is a terminal device. The apparatus includes an intensity measurement unit that measures the reception strength of a notification signal broadcast from the base station device during a standby state, and a reception unit that receives a threshold value to be compared with the measured reception strength from the base station device. And a determination unit that determines whether to maintain the standby state based on the measured reception intensity and the received threshold value. In this apparatus, the reception unit receives an instruction to correct the received threshold value from the base station apparatus, and the determination unit, when receiving the instruction, corrects the received threshold value with a predetermined value and measures it. The maintenance of the standby state may be determined based on the reception intensity and the corrected threshold value.

  In order to compare the received power of the notification signal after lowering the threshold when receiving the notification signal notified by changing the directivity at a predetermined interval with the directional antenna pattern by the above apparatus. In addition, the standby state can be easily maintained.

  The intensity measurement unit may perform statistical processing on the measured reception intensity. The reception unit may accept a threshold value included in the notification signal. The reception unit may receive an instruction included in the notification signal.

  Yet another embodiment of the present invention is a transmission method. In this method, in order to cause a terminal device in a standby state to determine whether to maintain the standby state, the terminal device notifies a notification signal whose reception intensity is to be measured using an antenna pattern having a non-directional or predetermined directivity. And notifying the terminal device of a threshold value to be compared with the reception intensity of the notification signal measured by the terminal device. In this method, in the notifying step, the notification signal is a directional antenna pattern and the directivity is changed at a predetermined interval from a threshold value when the notification signal is notified by an omnidirectional antenna pattern. However, the threshold value in the case of notification may be reduced and notified.

  Yet another embodiment of the present invention is a reception method. The method includes a step of measuring a reception strength of a notification signal broadcast from a base station device during a standby state, a step of receiving a threshold value to be compared with the measured reception strength from the base station device, and a base station A step of receiving an instruction to correct the received threshold value from the device, a step of correcting the threshold value received with a value corresponding to the received instruction, and a standby based on the measured received intensity and the corrected threshold value. Determining to maintain the state.

  Yet another embodiment of the present invention is a program. This program uses a non-directional or directional antenna pattern stored in memory based on an external instruction to cause the terminal device to determine whether to maintain the standby state. A notification signal to be notified through the wireless network, and a threshold value to be compared with the reception strength of the notification signal measured by the terminal device is output from the memory to the terminal device and notified through the wireless network. And generating a threshold value and storing it in a memory. In this program, the notifying step changes the antenna pattern based on the data stored in the memory so as to change the directivity at a predetermined interval when the notification signal is notified by the directional antenna pattern. The step of generating and storing in the memory is that the notification signal is a directional antenna pattern and the directivity is set at a predetermined interval from a threshold value when the notification signal is notified by a non-directional antenna pattern. It is also possible to generate a small threshold value for notification while changing and store the threshold value.

  Yet another embodiment of the present invention is a program. This program measures the reception intensity of the notification signal notified from the base station device via the wireless network during the standby state and stores it in the memory, and stores it from the base station device via the wireless network. Receiving a threshold value to be compared with the reception strength and storing it in a memory; and determining whether to maintain a standby state based on the stored reception strength and threshold value. In this program, the step of accepting and storing in the memory receives an instruction to correct the threshold stored through the wireless network from the base station apparatus, and the step of determining is stored when the instruction is accepted. The threshold value may be corrected with the value stored in the memory, and the maintenance of the standby state may be determined based on the stored reception intensity and the corrected threshold value.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, the standby state can be maintained even when the reception level varies greatly.

  Before describing the present invention in detail, an outline will be described. The embodiment of the present invention assumes a case where a simple mobile phone system is used as a communication system, and a terminal device connected to a base station apparatus of the communication system is in a standby state. Moreover, the base station apparatus according to the present embodiment includes a plurality of antennas, and performs adaptive array antenna processing on a communication channel with a terminal apparatus. On the other hand, the notification signal including the predetermined control signal is controlled so that the antenna directivity changes at predetermined intervals (hereinafter, the directivity thus controlled is referred to as “variable directivity”), and the terminal device To be notified. The base station device informs the terminal device of the standby zone holding level to be compared with the measured reception level, while notifying the notification signal for the terminal device to measure the reception level.

  Furthermore, the base station apparatus according to the present embodiment transmits a directivity transmission flag indicating an instruction to lower the standby zone holding level when broadcasting a broadcast signal with variable directivity. Here, the standby zone holding level is set regardless of the antenna pattern when the base station apparatus broadcasts the broadcast signal, and specifically, is set according to the omnidirectional antenna pattern. Furthermore, when the base station apparatus broadcasts the broadcast signal with variable directivity, the directivity transmission flag is also transmitted as described above, and the standby zone holding level is lowered to the terminal apparatus. On the other hand, the terminal device is configured to be compatible with the above-described operation, and when receiving the directional transmission flag, the standby zone holding level is lowered and compared with the measured reception level of the notification signal. To do. As a result, if the measured reception level is equal to or higher than the standby zone holding level, the terminal device holds the standby state.

FIG. 1 shows a concept of a standby state of a communication system 100 to be compared with a communication system according to an embodiment. The communication system 100 includes a base station device 34, a first terminal device 10a and a second terminal device 10b collectively referred to as a terminal device 10.
The base station apparatus 34 is connected to a wired network (not shown). Further, the base station apparatus 34 broadcasts a broadcast signal using a non-directional antenna pattern, and the antenna pattern is formed in a substantially circular shape as in the standby zone 40 shown in the figure. The standby zone 40 indicates a range in which an incoming call signal can be received from the base station device 34, and this can be said to be an area where communication with the base station device 34 is possible.

  The terminal device 10 is wirelessly connected to the base station device 34, but is not currently communicating and is in a standby state. Here, since the first terminal apparatus 10a is inside the standby zone 40 and the second terminal apparatus 10b is outside the standby zone 40, the first terminal apparatus 10a receives an incoming call signal from the base station apparatus 34. However, the second terminal apparatus 10b cannot receive the incoming call signal from the base station apparatus 34. Specifically, the first terminal apparatus 10a has previously received the standby zone holding level from the base station apparatus 34, further measures the level of the notification signal received from the base station apparatus 34, and performs the measurement. The received level is higher than the standby zone holding level. On the other hand, the second terminal apparatus 10b has previously received the standby zone holding level from the base station apparatus 34, further measures the level of the notification signal received from the base station apparatus 34, and the measured reception level holds the standby zone holding level. It is smaller than the level.

  FIG. 2 shows a frame format of the communication system 100 according to the embodiment. One frame is composed of eight slots, that is, channels, which are indicated by “CH1” to “CH8” here. “CH 1” to “CH 4” are downlink channels from the base station apparatus 34 to the terminal apparatus 10, and “CH 5” to “CH 8” are uplink channels from the terminal apparatus 10 to the base station apparatus 34. Is a channel. Further, “CH 2” to “CH 4” and “CH 6” to “CH 8” are “call channels” for making a call, and normally, one of the terminal devices 10 is “CH 2” to “CH 4”. And one of “CH6” to “CH8” is assigned. Therefore, in the frame format shown in FIG. 2, three terminal devices 10 can talk.

  On the other hand, “CH1” is a broadcast channel broadcasted to the terminal apparatus 10 in the downlink, and includes predetermined control information. “CH5” is a control channel from one terminal apparatus 10 on the uplink, and includes predetermined control information and the like. Here, in order for the terminal apparatus 10 of FIG. 1 to determine whether to maintain the standby state, the reception level of the broadcast signal assigned to the broadcast channel of “CH1” is measured. Furthermore, it is assumed here that the standby zone holding level is also included in the notification signal and transmitted.

  FIG. 3 illustrates a data structure of a notification signal of the communication system 100 according to the embodiment. As shown in the figure, the notification signal is composed of 8 octets, and in order from the front, “area information / information element identifier”, “waiting zone selection level”, “waiting zone holding level”, “recalling handover processing level”, It includes “recalling type handover destination zone selection level”, “TCH switching type handover processing level”, “channel switching FER threshold value”, “reservation”, and “area information notification state number”. Here, the “standby zone holding level” directly related to the present invention will be described. The “standby zone holding level” is composed of an 8-bit signal, the maximum value is set to “01110010”, and the minimum value is set to “00101100”. Here, the maximum value is set to “80 dBμV” and the minimum value is set to “10 dBμV” in units of 1 dB. The base station apparatus 34 sets the “standby zone selection level” to the omnidirectional antenna pattern regardless of whether the broadcast signal is broadcast using a nondirectional antenna pattern or a variable directivity antenna pattern. Is set to a value that assumes, and a notification signal is notified.

  4A to 4B illustrate the concept of the standby state of the communication system 100 according to the embodiment. Here, the base station apparatus 34 and the terminal apparatus 10 in FIG. FIG. 4A shows a standby zone 40 when the base station apparatus 34 broadcasts a broadcast signal using a non-directional antenna pattern, as in FIG. As shown in the figure, the terminal apparatus 10 existing inside the standby zone 40 can receive the notification signal from the base station apparatus 34 at a level equal to or higher than the standby zone holding level almost constantly. FIG. 4B shows a first standby zone 42a and a second standby zone 42b when the base station apparatus 34 broadcasts a broadcast signal using a variable directivity antenna pattern. As for the variation directivity, the notification signal may be notified by another directivity other than the first standby zone 42a and the second standby zone 42b. However, for the sake of simplification of description, the directivity is described above. Limited to two.

  The base station apparatus 34 notifies the notification signal with the directivity indicated as the first standby zone 42a at an arbitrary time, and notifies the notification signal with the directivity indicated as the second standby zone 42b at another time. To do. As illustrated, the terminal device 10 existing inside the first standby zone 42a at an arbitrary time can receive the notification signal from the base station device 34 at the standby zone holding level or higher. On the other hand, since the terminal device 10 is outside the second standby zone 42b at another time, the notification signal from the base station device 34 cannot be received at the standby zone retention level or higher. That is, if the variation directivity is obtained, the variation in the level of the received notification signal becomes large, so that it is difficult to maintain the standby state in the terminal device 10. On the other hand, if the notification signal is notified by the variation directivity as shown in the figure, the transmission power per antenna is reduced, and thus the amplifier can be downsized.

  FIG. 5 illustrates a configuration of the base station apparatus 34 according to the embodiment. The base station apparatus 34 includes a first base station antenna 14a, a second base station antenna 14b, a fourth base station antenna 14d, which are collectively referred to as a base station antenna 14, and a first radio section, collectively referred to as a radio section 12. 12a, the second radio unit 12b, the fourth radio unit 12d, the signal processing unit 18, the modem unit 20, the baseband unit 22, the control unit 24, the switching unit 26, the threshold value generating unit 28, and the information generating unit 30. Further, as signals, a first digital reception signal 200a, a second digital reception signal 200b, a fourth digital reception signal 200d, which are collectively referred to as a digital reception signal 200, a first digital transmission signal 202a, which is collectively referred to as a digital transmission signal 202, 2 digital transmission signal 202b, 4th digital transmission signal 202d, signal processing control signal 204, synthesized signal 206, and pre-separation signal 208.

  The baseband unit 22 is an interface with the network 32 and performs transmission / reception processing of an information signal to be transmitted in the communication system 100. In addition, a notification signal is generated as an information signal. Further, error correction and automatic retransmission processing may be performed, but the description thereof is omitted here.

  As a modulation process, the modem unit 20 modulates a carrier with an information signal to be transmitted and generates a transmission signal. Here, a π / 4 shift QPSK (Quadrature Phase Shift Keying) is targeted as a modulation method. Further, as a demodulation process, the received signal is subjected to delay detection, and the transmitted information signal is reproduced.

  The signal processing unit 18 performs signal processing necessary for transmission / reception processing by the adaptive array antenna. In the broadcast channel that broadcasts the broadcast signal, signal processing is performed so that the antenna pattern has a variable directivity. The variation directivity is, for example, 36 phases when 360 ° of a plane perpendicular to the antenna is set to 0 ° in an arbitrary direction and 36 phases are set discretely in units of 10 °. One of them is randomly selected at a predetermined time interval. Further, in the broadcast channel, signal processing is performed so as to obtain an omnidirectional antenna pattern. For example, the non-directional antenna pattern is realized by enabling only the first radio unit 12a. Note that one of fluctuation directivity and non-directivity is designated by the switching unit 26 described later.

The radio unit 12 performs frequency conversion processing, amplification processing, AD or DA conversion processing between a baseband signal and a radio frequency signal processed by the signal processing unit 18, the modem unit 20, and the baseband unit 22.
The base station antenna 14 transmits and receives radio frequency signals. Here, the directivity of each antenna is omnidirectional, but since the signal transmitted from these antennas is controlled by the signal processing unit 18, adaptive array processing or variable directivity is realized. The number of antennas is four.

The control unit 24 controls the timing of the radio unit 12, the signal processing unit 18, the modem unit 20, and the baseband unit 22.
The switching unit 26 has an external interface, and receives an instruction to change the antenna pattern when the notification signal is notified to the variable directivity or the non-directivity via the interface.

  The threshold generation unit 28 sets the standby zone holding level based on the instruction received by the switching unit 26. For example, when reporting with an omnidirectional antenna pattern, the standby zone holding level is set to 20 dBμV, while when broadcasting with a variable directional antenna pattern, the standby zone holding level is omnidirectional. A directivity transmission flag indicating an instruction to lower the standby zone holding level is generated. If it is lowered by 3 dB by this directivity transmission flag, the standby zone holding level substantially corresponds to 17 dBμV or the like when notified by a variable directivity antenna pattern.

  The information generator 30 sets the standby zone retention level set by the threshold generator 28 to the notification signal shown in FIG. For example, when the standby zone holding level set by the threshold generation unit 28 is “20 dBμV”, the standby zone holding level in FIG. 3 is set to “00110101”. Further, when the directional transmission flag exists, 1 bit of “reservation” in FIG. 3 is set to “1”, and when the directional transmission flag does not exist, 1 bit of “reservation” in FIG. Is set to “0”. Note that the standby zone holding level and the directivity transmission flag are not included in the notification signal, but may be notified by the terminal device 10 by other signals.

  This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of an arbitrary computer, and in terms of software, it is realized by a program having a reservation management function loaded in memory. The functional block realized by those cooperation is drawn. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

  FIG. 6 shows the configuration of the signal processing unit 18. The signal processing unit 18 includes a synthesis unit 50, a reception weight vector calculation unit 56, a reference signal generation unit 58, a reception response vector calculation unit 60, a separation unit 62, and a transmission weight vector calculation unit 66. The synthesis unit 50 is a multiplication unit. 52 includes a first multiplication unit 52 a, a second multiplication unit 52 b, a third multiplication unit 52 c, a fourth multiplication unit 52 d, and an addition unit 54, and the separation unit 62 is a first multiplication collectively referred to as a multiplication unit 64. Part 64a, second multiplier 64b, third multiplier 64c, and fourth multiplier 64d. As signals, a first reception weight signal 210a, a second reception weight signal 210b, a third reception weight signal 210c, a fourth reception weight signal 210d, a reception response vector signal 212, a transmission weight signal, which are collectively referred to as a reception weight signal 210, The first transmission weight signal 214a, the second transmission weight signal 214b, the third transmission weight signal 214c, the fourth transmission weight signal 214d, the reception weight reference signal 216, and the reception response reference signal 218, which are collectively referred to as 214, are included.

  A reception weight vector calculation unit 56 generates a reception weight signal 210 necessary for weighting the digital reception signal 200 from the digital reception signal 200 and the reception weight reference signal 216 by using an RLS (Recursive Last Squares) algorithm or an LMS (Least Mean Squares) algorithm. Calculate by an adaptive algorithm such as

The multiplier 52 weights the digital reception signal 200 with the reception weight signal 210, and the adder 54 adds the outputs of the multiplier 52 and outputs a combined signal 206.
The reference signal generator 58 outputs the training signal stored in advance as a reception weight reference signal 216 and a reception response reference signal 218 during the training period. Further, after the training period, the composite signal 206 is determined with a predetermined threshold value, and the result is output as a reception weight reference signal 216 and a reception response reference signal 218. Note that the determination does not need to be a hard determination, and may be a soft determination.

  The reception response vector calculation unit 60 calculates the reception response vector signal 212 as the reception response characteristic of the reception signal with respect to the transmission signal from the digital reception signal 200 and the reception response reference signal 218. The calculation method of the reception response vector signal 212 may be arbitrary, but is executed based on the correlation processing as shown below as an example. The digital reception signal 200 and the reception response reference signal 218 are input not only from within the signal processing unit 18 but also from a signal processing unit corresponding to another user's terminal device 10 through a signal line (not shown). To do. The digital reception signal 200 corresponding to the first terminal device 10 is indicated as x1 (t), the digital reception signal 200 corresponding to the second terminal device 10 is indicated as x2 (t), and the reception corresponding to the first terminal device 10 is indicated. If the response reference signal 218 is denoted by S1 (t) and the reception response reference signal 218 corresponding to the second terminal device 10 is denoted by S2 (t), x1 (t) and x2 (t) are expressed by the following equations. .

ここで、ｈｉｊは、第ｉ番目の端末装置１０から第ｊ基地局用アンテナ１４ｊまでの応答特性であり、また雑音は無視する。第１の相関行列Ｒ１は、Ｅをアンサンブル平均として、次の式で示される。

Here, hij is a response characteristic from the i-th terminal apparatus 10 to the j-th base station antenna 14j, and noise is ignored. The first correlation matrix R1 is expressed by the following equation, where E is an ensemble average.

受信応答参照信号２１８間の第２の相関行列Ｒ２も次の式のように計算される。

The second correlation matrix R2 between the reception response reference signals 218 is also calculated as follows.

最終的に、第２の相関行列Ｒ２の逆行列と第１の相関行列Ｒ１を乗算し、次の式で示される受信応答ベクトル信号２１２が求められる。

Finally, the inverse matrix of the second correlation matrix R2 and the first correlation matrix R1 are multiplied to obtain a reception response vector signal 212 expressed by the following equation.

送信ウエイトベクトル計算部６６は、分離前信号２０８の重み付けに必要な送信ウエイト信号２１４を、受信応答特性である受信ウエイト信号２１０や受信応答ベクトル信号２１２から推定する。送信ウエイト信号２１４の推定方法は、任意とするが、最も簡易な方法として、受信ウエイト信号２１０や受信応答ベクトル信号２１２をそのまま使用すればよい。あるいは、受信処理と送信処理の時間差で生じる伝搬環境のドップラー周波数変動を考慮して、従来の技術によって、受信ウエイト信号２１０や受信応答ベクトル信号２１２を補正してもよい。なお、ここでは、送信ウエイト信号２１４の推定に、受信応答ベクトル信号２１２を使用する。変動指向性を実現する場合は、送信ウエイト信号２１４として予め複数のパターンを用意し、複数のパターンのうちのひとつを周期的に選択する。

The transmission weight vector calculation unit 66 estimates the transmission weight signal 214 necessary for weighting the pre-separation signal 208 from the reception weight signal 210 and the reception response vector signal 212 that are reception response characteristics. Although the estimation method of the transmission weight signal 214 is arbitrary, the reception weight signal 210 and the reception response vector signal 212 may be used as they are as the simplest method. Alternatively, the reception weight signal 210 and the reception response vector signal 212 may be corrected by a conventional technique in consideration of the Doppler frequency fluctuation in the propagation environment caused by the time difference between the reception process and the transmission process. Here, the reception response vector signal 212 is used to estimate the transmission weight signal 214. In order to realize variable directivity, a plurality of patterns are prepared in advance as the transmission weight signal 214, and one of the plurality of patterns is periodically selected.

  The multiplier 64 weights the pre-separation signal 208 with the transmission weight signal 214 and outputs the digital transmission signal 202. Note that the timing in the above operation is in accordance with the signal processing control signal 204.

FIG. 7 illustrates a configuration of the terminal device 10 according to the embodiment. The terminal device 10 includes a terminal antenna 70, a radio unit 72, a modem unit 74, a baseband unit 76, a detection unit 78, a determination unit 80, a measurement unit 82, and a control unit 84.
The terminal antenna 70 transmits and receives radio frequency signals. The radio unit 72 performs frequency conversion processing, amplification processing, AD or DA conversion processing between the baseband signal and the radio frequency signal processed by the modem unit 74 and the baseband unit 76. As a modulation process, the modem unit 74 modulates the carrier with an information signal to be transmitted to generate a transmission signal. Here, the modulation method is targeted for π / 4 shift QPSK. Further, as a demodulation process, the received signal is subjected to delay detection, and the transmitted information signal is reproduced. The baseband unit 76 is an interface with a PC connected to the terminal device 10 and an application inside the terminal device 10.

The detection unit 78 detects the standby zone holding level from the received notification signal. If a directivity transmission flag is included, the directivity transmission flag is also detected.
The measuring unit 82 measures the reception level of the notification signal. Further, statistical processing such as averaging is performed on the measured reception level as necessary.

When the detection unit 78 detects the directivity transmission flag, the determination unit 80 corrects the standby zone holding level to obtain a new standby zone holding level. For example, when the directional transmission flag is detected and the standby zone holding level is “20 dBμV”, the new standby zone holding level is set to “17 dBμV”. Further, the standby zone holding level is compared with the reception level measured by the measuring unit 82. When the reception level is equal to or higher than the standby zone holding level, the standby state holding is determined. The result is output to the control unit 84.
The control unit 84 controls the timing of the radio unit 72, the modem unit 74, the baseband unit 76, and the like.

  FIG. 8 is a flowchart showing a standby zone holding level notification procedure in the base station apparatus 34. It is assumed that variable directivity or non-directivity is set in the switching unit 26. The base station apparatus 34 notifies the standby zone holding level (S10). If the switching unit 26 is set to change directivity (Y in S12), the directivity transmission flag is included in the notification signal and notified (S14). In this case, the notification signal is notified by a variable directivity antenna pattern.

  FIG. 9 is a flowchart illustrating a procedure for maintaining the standby state in the terminal device 10. The detection unit 78 detects the standby zone holding level (S20). If the detection unit 78 detects a directivity transmission flag (Y in S22), the determination unit 80 corrects the standby zone holding level and determines a threshold value (S24). On the other hand, if the detection unit 78 does not detect the directivity transmission flag (N in S22), the determination unit 80 determines the standby zone retention level as a threshold value (S26). The measuring unit 82 measures the reception intensity of the notification signal (S82). If the reception intensity is equal to or greater than the threshold (Y in S30), the determination unit 80 maintains the standby state (S32). On the other hand, if the reception intensity is not greater than or equal to the threshold value (N of 30), the standby state is canceled (S34).

  According to the embodiment of the present invention, even when notification is performed while changing the directivity of the notification signal at a predetermined interval, the threshold value for comparison with the reception level of the notification signal is set as the directivity transmission flag. Therefore, the standby state can be easily maintained. Further, since the base station apparatus transmits the broadcast signal with a plurality of antennas with a predetermined directivity, the transmission power per antenna can be reduced.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to combinations of the respective constituent elements and processing processes, and such modifications are also within the scope of the present invention. is there.

  In the embodiment of the present invention, the communication system 100 is applied to a simple mobile phone system based on TDI (Time Division Multiple Access). However, the present invention is not limited to this. For example, the present invention may be applied to a third generation mobile phone system based on CDMA (Code Division Multiple Access) and other wireless communication systems. According to this modification, the present invention can be applied to various wireless communication systems. That is, it is only necessary to determine whether the standby state is maintained based on a predetermined notification signal.

  In the embodiment of the present invention, when the base station device 34 transmits a broadcast signal with variable directivity, the standby zone holding level is set to the same value as in the case of non-directional and a directivity transmission flag is transmitted separately. did. However, the present invention is not limited to this. For example, the standby zone holding level may be set to a value smaller than that in the case of non-directional transmission. In this case, transmission of the directivity transmission flag is unnecessary. According to this modification, it is not necessary to change the function of the terminal device 10. That is, the threshold value for comparison with the measured reception level only needs to be small.

It is a figure which shows the concept of the standby state of the communication system which should be compared with the communication system which concerns on an Example. It is a figure which shows the frame format of the communication system which concerns on an Example. It is a figure which shows the data structure of the alerting | reporting signal of the communication system which concerns on an Example. 4A to 4B are diagrams illustrating a concept of a standby state of the communication system according to the embodiment. It is a figure which shows the structure of the base station apparatus which concerns on an Example. It is a figure which shows the structure of the signal processing part of FIG. It is a figure which shows the structure of the terminal device which concerns on an Example. It is a flowchart which shows the procedure of standby zone holding | maintenance level alerting | reporting by FIG. It is a flowchart which shows the procedure of the maintenance of the standby state by FIG.

Explanation of symbols

  10 terminal devices, 12 radio units, 14 base station antennas, 18 signal processing units, 20 modem units, 22 baseband units, 24 control units, 26 switching units, 28 threshold generation units, 30 information generation units, 32 networks 34 base station device, 40 standby zone, 42 standby zone, 50 combining unit, 52 multiplying unit, 54 adding unit, 56 reception weight vector calculating unit, 58 reference signal generating unit, 60 reception response vector calculating unit, 62 demultiplexing unit, 64 multiplication unit, 66 transmission weight vector calculation unit, 70 antenna for terminal, 72 radio unit, 74 modem unit, 76 baseband unit, 78 detection unit, 80 determination unit, 82 measurement unit, 84 control unit, 100 communication system, 200 Digital reception signal, 202 digital transmission Signal, 204 signal processing control signal, 206 composite signal, 208 pre-separation signal 210 received wait signal, 212 receiving response vector signal, 214 transmission weight signal, 216 receiving weight reference signal, 218 receiving response reference signal.

Claims (11)

In order for the terminal device in the standby state to determine whether to maintain the standby state, a notification unit that notifies the notification signal that the terminal device should measure the reception intensity with an omnidirectional or predetermined antenna pattern,
A notification unit for notifying the terminal device of a threshold value to be compared with the reception intensity of the notification signal measured by the terminal device;
A generator for generating the threshold value,
The notification unit, when notifying the notification signal with a directional antenna pattern, changes the directivity at a predetermined interval,
The generation unit notifies the notification signal while changing the directivity at a predetermined interval from a threshold value when the notification signal is notified by an omnidirectional antenna pattern. A base station apparatus characterized in that a threshold value is reduced when being performed.   The generation unit broadcasts the broadcast signal with a non-directional antenna pattern as a threshold when the broadcast signal is broadcast with a directional antenna pattern and the directivity is changed at a predetermined interval. 2. The base station according to claim 1, wherein the base station generates a first signal having a value equal to a threshold value in a case where the second signal is generated and a second signal indicating an instruction to lower the value of the first signal. apparatus.   The base station apparatus according to claim 1, wherein the notification unit notifies the threshold value included in the notification signal. An intensity measuring unit that measures the reception intensity of the notification signal notified from the base station device during the standby state;
A reception unit that receives a threshold value to be compared with the measured reception intensity from the base station device;
Based on the measured reception intensity and the received threshold, a determination unit that determines whether to maintain a standby state,
The reception unit receives an instruction to correct the received threshold value from the base station device,
The determination unit, when receiving the instruction, corrects the received threshold value with a predetermined value, and determines whether to maintain a standby state based on the measured reception intensity and the corrected threshold value. A terminal device characterized by the above.   The terminal device according to claim 4, wherein the strength measurement unit statistically processes the measured reception strength.   The terminal device according to claim 4, wherein the reception unit receives the threshold value included in the notification signal.   The terminal device according to claim 4, wherein the reception unit receives the instruction included in the notification signal. In order for the terminal device in the standby state to determine whether to maintain the standby state, the step of notifying the notification signal that the terminal device should measure the reception intensity with a non-directional or predetermined directional antenna pattern,
Notifying the terminal device of a threshold value to be compared with the reception intensity of the notification signal measured by the terminal device,
The notifying step is such that the notification signal is a directional antenna pattern and the directivity is changed at a predetermined interval from a threshold value when the notification signal is notified by a non-directional antenna pattern. A transmission method characterized in that a notification is made by reducing a threshold value when notified. Measuring the reception strength of the notification signal notified from the base station device during the standby state;
Receiving a threshold value to be compared with the measured reception intensity from the base station device;
Receiving an instruction to correct the received threshold value from the base station apparatus;
Correcting the accepted threshold value with a value corresponding to the accepted instruction;
Determining to maintain a standby state based on the measured reception strength and the corrected threshold;
A receiving method comprising: In order for the terminal device in the standby state to determine whether to maintain the standby state, a notification signal that the terminal device should measure the reception intensity with a non-directional antenna pattern or a directional antenna pattern stored in the memory based on an instruction from the outside Broadcasting via a wireless network; and
Outputting to the terminal device a threshold value to be compared with the reception intensity of the notification signal measured by the terminal device from the memory, and notifying via a wireless network;
Generating the threshold value and storing it in the memory,
The notifying step, when notifying the notification signal with a directional antenna pattern, changes the antenna pattern based on the data stored in the memory so as to change the directivity at a predetermined interval,
The step of generating and storing in the memory includes a step in which the notification signal is a directional antenna pattern and the directivity is predetermined based on a threshold value when the notification signal is notified by a non-directional antenna pattern. A program for causing a computer to generate a threshold value for notification while changing at intervals of a small value and store the threshold value. Measuring the reception strength of the notification signal notified from the base station device via the wireless network during the standby state and storing it in the memory;
Receiving, from the base station device, a threshold value to be compared with the stored reception intensity via a wireless network and storing the threshold value in a memory;
Determining whether to maintain a standby state based on the stored reception strength and threshold value,
The step of receiving and storing in the memory receives an instruction from the base station apparatus to correct the stored threshold value via a wireless network,
In the determination step, when the instruction is received, the stored threshold value is corrected with a value stored in a memory, and the standby state is maintained based on the stored reception intensity and the corrected threshold value. A program for causing a computer to execute determination.

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