JP4608404B2 - Mobile communication system, mobile station apparatus, and communication start availability determination method - Google Patents

Description

  The present invention relates to a mobile communication system, a mobile station apparatus, and a communication start availability determination method.

  When a mobile station apparatus starts communication in a mobile communication system, the mobile station apparatus first receives a reception power confirmation signal transmitted from the base station apparatus. One specific example of the received power confirmation signal is a simultaneous broadcast signal transmitted from the base station device to the mobile station devices in the area.

  Based on the received power of the received power confirmation signal, the mobile station apparatus determines whether or not communication with the base station apparatus that has transmitted the received power confirmation signal is possible. Start communication. In the conventional mobile communication system, the mobile station apparatus can communicate in a good communication environment in this way. Since the reception power confirmation signal is used as a reference for determining whether or not communication is possible, the base station apparatus transmits the reception power confirmation signal with the maximum transmission power.

Patent Document 1 discloses a technique for determining whether to transmit using a wide-area cell antenna or a narrow-area cell antenna based on attributes of communication data (whether continuity or real-time performance is necessary). Is described.
JP2003-259435A (abstract, paragraph 0008)

  By the way, in some base station apparatuses, the ratio of the reception power of the mobile station apparatus to the transmission power of the base station apparatus (hereinafter referred to as reception efficiency) differs between the reception power confirmation signal and the communication signal. . One example is a base station apparatus that includes an adaptive array antenna and performs directional transmission. Hereinafter, a base station apparatus that performs this directional transmission will be described.

  The base station apparatus determines the transmission power and phase of the signal transmitted to each mobile station apparatus when performing directional transmission, and the received power of the communication signal from each mobile station apparatus at each antenna constituting the adaptive array antenna. And for each antenna based on the phase. By doing so, the base station apparatus realizes directional transmission.

  Therefore, in order to perform directional transmission, the base station apparatus needs to receive radio waves from the mobile station apparatus at least once. In this regard, since the mobile station apparatus receives the reception power confirmation signal before starting communication, the base station apparatus cannot transmit the reception power confirmation signal to the mobile station apparatus in a directional manner. Therefore, transmission is performed by omnidirectional communication.

  Here, in the directional transmission, the reception power of the mobile station apparatus increases even if the transmission power of the base station apparatus is the same as compared to the non-directional transmission. That is, the reception efficiency increases. This increase is generally referred to as adaptive array gain. With this adaptive array gain, in the base station apparatus that performs directional transmission, the reception efficiency of the reception power confirmation signal is lower than the reception efficiency of the communication signal.

  As described above, when using a base station apparatus having different reception efficiencies between the reception power confirmation signal and the communication signal, the determination result of whether or not the mobile station apparatus can start communication may be inappropriate. That is, even when the mobile station apparatus determines that communication with the base station apparatus is impossible based on the reception power of the reception power confirmation signal, there are cases where communication is actually possible.

  Therefore, one of the problems of the present invention is that the mobile station apparatus performs communication depending on whether the base station apparatus to communicate with is a base station apparatus having different reception efficiency between the reception power confirmation signal and the communication signal. It is an object of the present invention to provide a mobile communication system, a mobile station apparatus, and a communication start availability determination method that make it possible to determine whether start is possible.

  A mobile communication system according to the present invention for solving the above problem is a mobile communication system including a base station device and a mobile station device, wherein the base station device determines whether or not communication can be started in the mobile station device. Reception efficiency difference amount information transmitting means for transmitting reception efficiency difference amount information indicating a difference in reception efficiency between a reception power confirmation signal used as a reference for the communication signal and a communication signal to the mobile station device, and the reception A reception power confirmation signal transmission means for transmitting a power confirmation signal, wherein the mobile station apparatus receives the reception efficiency difference information and the reception power confirmation signal, and receives the reception power confirmation signal by the reception means. Received power acquisition means for acquiring received power when a received power confirmation signal is received, received efficiency difference information received by the receiving means, and acquired by the received power acquisition means. And receiving electric power, based on, including a determination unit for determining whether it is possible to initiate communication with the base station apparatus, characterized in that.

  According to this, the mobile station apparatus determines whether or not communication can be started depending on whether or not the base station apparatus to communicate with is a base station apparatus having a reception efficiency different between the reception power confirmation signal and the communication signal. It becomes possible.

  In the mobile communication system, the mobile station apparatus further includes storage means for storing required reception power in association with the reception efficiency difference amount information, and the determination means is acquired by the reception power acquisition means. When the received power is equal to or higher than the required received power stored in the storage unit in association with the reception efficiency difference information received by the receiving unit, communication with the base station apparatus can be started. It may be determined that.

  Further, in this mobile communication system, the required received power stored in the storage means may be smaller as the difference in reception efficiency indicated by the reception efficiency difference information is larger.

  In each of the mobile communication systems, the reception efficiency difference information may be information indicating whether or not the base station apparatus performs directional transmission.

  Also, the mobile station apparatus according to the present invention receives reception efficiency difference amount information indicating a difference in reception efficiency between a reception power confirmation signal used as a reference for determining whether communication can be started and a communication signal from the base station apparatus. A reception power receiving means for receiving the reception power confirmation signal, a reception power acquisition means for acquiring the reception power when the reception power confirmation signal is received by the reception means, and a reception means for receiving the reception power confirmation signal. And determining means for determining whether or not communication with the base station apparatus can be started based on the received efficiency difference information and the received power acquired by the received power acquiring means.

  Also, the communication start availability determination method according to the present invention is a mobile communication system comprising a base station apparatus and a mobile station apparatus, wherein the mobile station apparatus determines whether communication with the base station apparatus can be started. A determination method for determining whether or not a reception power of a reception power confirmation signal used as a reference for determining whether communication can be started in the mobile station device and a communication signal from the base station device to the mobile station device. A reception efficiency difference amount information transmission step for transmitting reception efficiency difference amount information indicating a difference amount; and a reception power confirmation signal transmission step for transmitting the reception power confirmation signal from the base station device to the mobile station device; A reception step of receiving the reception efficiency difference information and the reception power confirmation signal in the mobile station device; and in the reception step of the mobile station device in the reception step, A reception power acquisition step for acquiring reception power when a reception power confirmation signal is received, the mobile station apparatus is acquired in the reception power difference amount information received in the reception step, and the reception power acquisition step. A determination step of determining whether communication with the base station apparatus can be started based on the received power.

  Embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram showing a system configuration of a mobile communication system 1 according to an embodiment of the present invention. As shown in the figure, the mobile communication system 1 includes a mobile station device 10, a plurality of base station devices 20, and a communication network 30.

  In the present embodiment, some of the base station devices 20 are provided with an adaptive array antenna, and directional transmission is performed using the adaptive array antenna. The base station apparatus 20 performs space division multiplex communication with a plurality of mobile station apparatuses 10 by this directional communication.

  The base station device 20 has a geographical range (area) in which communication with the mobile station device 10 is possible. The base station apparatus 20 broadcasts the received power confirmation signal to the mobile station apparatus 10 existing in this area by omnidirectional transmission with the maximum transmission power.

  When starting communication with the base station apparatus 20-1, the mobile station apparatus 10 first receives a reception power confirmation signal transmitted from the base station apparatus 20-1. The mobile station apparatus 10 determines whether or not communication with the base station apparatus 20-1 is possible based on the received power of the received power confirmation signal, and only when it is determined that communication is possible with the base station apparatus 20-1. To start.

  When the base station apparatus 20 performs space division multiplex communication, the reception efficiency of the reception power confirmation signal (the ratio of the received power of the mobile station apparatus 10 to the transmission power of the base station apparatus 20) is a communication related to the space division multiplex communication. Lower than the signal. In the present embodiment, it is possible to determine whether or not the mobile station apparatus 10 can appropriately communicate by receiving such a reception power confirmation signal. Specifically, in the first embodiment, the reception efficiency of the reception power confirmation signal is set to be approximately the same as that of the communication signal. In the second embodiment, the mobile station device 10 is configured to change the determination criteria depending on whether or not the base station device 20 to communicate with is the base station device 20 that performs space division multiplex communication. Each embodiment will be described below.

[Embodiment 1]
FIG. 2 is a diagram illustrating functional blocks of the base station device 20 according to the first embodiment. As shown in the figure, the base station apparatus 20 has a plurality of transmission apparatuses 40-n (here, n = 1, 2). Each transmission device 40-n includes an adaptive array antenna 41-n, a transceiver 42-nm, a modem unit 43-n, and a control unit 44-n. The base station device 20 is functionally configured to include a transmission device integration / separation unit 45, a directivity determination unit 46, a transmission signal acquisition unit 47a, and an adaptive array calculation unit 48.

  First, the transmission device 40-n will be described. Each adaptive array antenna 41-n is composed of four antennas 41-nm (m = 1 to 4). The transceiver 42-nm and the antenna 41-nm are connected for communication. Each transceiver 42-nm is connected to a modem 43-n. The control unit 44-n is communicatively connected to the modem unit 43-n and each transceiver 42-nm.

  The modem unit 43-n modulates the transmission signal input from the transmission device integration / separation unit 45 and outputs the modulated signal to each transceiver 42-nm. Each transceiver 42-n-m amplifies or phase-converts the input transmission signal so that the transmission power and phase comply with the instructions of the control unit 44-n, and the corresponding antenna 41-n-m Output. The antenna 41-nm emits the input transmission signal to the radio section. The mobile station apparatus 10 receives the signal transmitted in this way.

  Each antenna 41-nm receives an incoming signal and outputs it to a transceiver 42-nm that is provided correspondingly. Each transceiver 42-n-m amplifies the input signal and outputs it to the modem unit 43-n, and outputs the received power and phase to the control unit 44-n. The modem unit 43-n demodulates the input signal and outputs the demodulated signal to the transmission device integrated separation unit 45. The transmission apparatus integration / separation unit 45 outputs the input signal to a reception signal acquisition unit (not shown).

  The control unit 44-n instructs the modulation / demodulation unit 43-n the modulation scheme for modulation and the modulation scheme for demodulation. Also, the control unit 44-n outputs the received power and phase input from each transceiver 42-nm to the adaptive array calculation unit 48 for each mobile station device 10. Further, the control unit 44-n determines the transmission power and phase of each transceiver 42-nm according to the instruction of the adaptive array computing unit 48, and uses the transmission power and phase determined for each transceiver 42-nm. Instruct to output.

  The transmission signal acquisition unit 47 a acquires a transmission signal to be transmitted to the mobile station device 10 and outputs the transmission signal to the transmission device integrated separation unit 45. This transmission signal includes a transmission signal that constitutes a reception power confirmation signal that is transmitted simultaneously, and a transmission signal that constitutes a communication signal transmitted to each mobile station apparatus 10.

  The directivity determining unit 46 determines, for each frame, whether to transmit by a radio wave having directivity realized by the adaptive array antenna 41 or to transmit by a non-directional radio wave when transmitting the frame. . The directivity determination unit 46 outputs the determination result to the transmission device integrated separation unit 45.

  The transmission device integration / separation unit 45 is input from any one of the plurality of transmission devices 40 or any one of the plurality of transmission devices 40 according to the determination result input from the directivity determination unit 46. To transmit the transmitted signal. Specifically, the transmission apparatus integration / separation unit 45 determines at least a part of the transmission signal determined to be omnidirectional transmission according to the determination result input from the directivity determination unit 46 (more specifically, , It is determined that the mobile station apparatus 10 transmits from a plurality of transmission apparatuses 40 a reception power confirmation signal used as a reference for determining whether communication can be started. On the other hand, the transmission apparatus integration / separation unit 45 determines that a transmission signal determined to be directional transmission is transmitted from any one of the plurality of transmission apparatuses 40.

  More specifically, for the transmission signal (reception power confirmation signal) determined to be omnidirectional transmission, the transmission device integrated separation unit 45 is one of a plurality of time slots to be transmitted by the transmission device 40-1. Is one of a plurality of time slots to be transmitted by the transmission device 40-2, and is determined as a time slot of the transmission device 40-1 that has already been determined. A time slot transmitted at the same frequency and at the same timing is determined as another time slot for transmitting the input transmission signal. The transmission apparatus integration / separation unit 45 outputs the input transmission signal to both the modem unit 43-1 and the modem unit 43-2 at the timing for transmitting the determined time slot.

  On the other hand, for the transmission signal (communication signal) determined to be directional transmission, the transmission apparatus integration / separation unit 45 receives one of a plurality of time slots to be transmitted by any one of the transmission apparatuses 40-n. The time slot for transmitting the transmission signal is determined. The transmission device integration / separation unit 45 outputs the input transmission signal to one of the transmission devices 40-n at the timing for transmitting the determined time slot.

  Further, the transmission device integrated separation unit 45 outputs the determination result of the directivity determination unit 46 to the adaptive array calculation unit 48.

  The adaptive array calculation unit 48 determines the transmission power and phase determination method for each transceiver 42 -nm based on the determination result of the directivity determination unit 46. That is, the adaptive array calculation unit 48 calculates a weighting factor for each transceiver 42-nm for the transmission signal indicating that the determination result of the directivity determination unit 46 is transmitted by radio waves having directivity. The transmission power and phase are determined based on the weighting factor. On the other hand, for the transmission signal indicating that the determination result of the directivity determination unit 46 is transmitted by a non-directional radio wave, the adaptive array calculation unit 48 uses the same transmission power and phase for each transceiver 42 -nm The transmission power and phase are determined so that transmission is performed.

  A transmission signal indicating that the determination result of the directivity determining unit 46 is transmitted by a radio wave having directivity will be specifically described below. The adaptive array calculation unit 48 acquires the position where the mobile station device 10 exists based on the received power and phase in each transceiver 42-nm for each mobile station device 10 input from each control unit 44-n. . Specifically, the adaptive array calculation unit 48 acquires the position where the mobile station apparatus 10 exists by calculating a weighting coefficient. This weight coefficient is calculated for each mobile station apparatus 10 and for each transceiver 42-nm. The adaptive array operation unit 48 outputs the calculated weighting coefficient to each control unit 44-n, thereby instructing each control unit 44-n the transmission power and phase of each transceiver 42-nm.

  For the transmission signal indicating that the determination result of the directivity determining unit 46 is transmitted by a radio wave having directivity, the adaptive array computing unit 48 transmits each transmitter / receiver 42-nm with the same transmission power and phase. The transmission power and phase of each transceiver 42-nm are instructed to each control unit 44-n.

  Receiving the instruction from the adaptive array computing unit 48, each control unit 44-n determines the transmission power and phase of each transceiver 42-nm according to the instruction as described above.

  The processing of the base station apparatus 20 described above will be described again in detail with reference to the processing flowchart.

  FIG. 3 is a flowchart of processing of the base station apparatus 20. In the figure, it is assumed that CCH (control channel) is transmitted omnidirectionally and TCH (communication channel) is transmitted directionally. Also, in the figure, as a premise, a control signal transmitted / received on the CCH is used as a reception power confirmation signal.

  First, the base station apparatus 20 generates a transmission start request (S100). This corresponds to a process in which a communication processing unit (not shown) inputs a transmission signal to the transmission signal acquisition unit 47a. Next, the directivity determination unit 46 determines whether the transmission signal input to the transmission signal acquisition unit 47a is CCH or TCH (S101).

  In the case of CCH, the transmission apparatus integration / separation unit 45 integrates and uses eight antennas, that is, antennas 41-nm (n = 1, 2, m = 1, 2, 3, 4) as one transmission system. Is determined (S102). On the other hand, in the case of TCH, the transmission apparatus integration / separation unit 45 determines to use the eight antennas separately as four independent transmission systems (S105).

  When eight antennas are integrated and used as one transmission system, the transmission apparatus integration / separation unit 45 outputs a transmission signal to both the modem unit 43-1 and the modem unit 43-2. Thus, the transmission signal is transmitted from the transmission device 40-1 and the transmission device 40-2 (S103, S104).

  When the four antennas are separated and used as independent transmission systems, the transmission apparatus integrated separation unit 45 outputs a transmission signal to either the modem unit 43-1 or the modem unit 43-2. As a result, the transmission signal is transmitted from either the transmission device 40-1 or the transmission device 40-2 (S106, S107).

  As described above, the base station apparatus 20 transmits a transmission signal (particularly a reception power confirmation signal) to be transmitted omnidirectionally from a plurality of transmission apparatuses 40 simultaneously. For this reason, the reception efficiency of the transmission signal for omnidirectional transmission is relatively higher than the reception efficiency of the transmission signal for directional transmission. Therefore, the difference between the reception efficiency of signals transmitted by omnidirectional transmission and the reception efficiency of signals transmitted by directional transmission can be reduced.

[Embodiment 2]
FIG. 4 is a diagram illustrating functional blocks of the base station device 20 according to the second embodiment. FIG. 5 is a diagram illustrating functional blocks of the mobile station apparatus 10 according to the second embodiment.

  As shown in FIG. 4, the base station apparatus 20 includes an adaptive array antenna 41, a transceiver 42-m (m = 1 to 4), a modem unit 43, a control unit 44, a directivity determining unit 46, and a transmission signal acquiring unit 47b. , An adaptive array calculation unit 48 and a reception efficiency difference amount information acquisition unit 49.

  As shown in FIG. 5, the mobile station apparatus 10 includes an antenna 50, a transceiver 51, a modem unit 52, a received signal acquisition unit 53, a communication processing unit 54, a reception efficiency difference amount information acquisition unit 55, and required reception power acquisition. Unit 56, storage unit 57, received power acquisition unit 59, and call start availability determination unit 58.

  The adaptive array antenna 41 includes four antennas 41-m (m = 1 to 4). The functions of the adaptive array antenna 41, the transceiver 42-m, the modulation / demodulation unit 43, and the control unit 44 are the same as those of the adaptive array antenna 41-n, the transceivers 42-nm, and the modulation / demodulation unit 43 in the first embodiment. Since it is the same as each function of -n and each control unit 44-n, description thereof is omitted here.

  The reception efficiency difference amount information acquisition unit 49 receives reception efficiency difference amount information indicating a difference in reception efficiency between a reception power confirmation signal used as a reference for determining whether communication can be started in the mobile station apparatus 10 and a communication signal. To get. This reception efficiency difference amount information indicates the type of the base station apparatus 20, that is, whether or not the base station apparatus 20 performs directional transmission. The reception efficiency difference information acquisition unit 49 inputs the acquired reception efficiency difference information to the transmission signal acquisition unit 47b.

  Note that the reception efficiency difference information may include more detailed information about the type of the base station device 20. Specifically, the reception efficiency difference amount information is a difference that affects reception efficiency in comparison with other base station apparatuses 20 such as whether directional transmission is performed with four antennas or eight antennas. It is good also as including the information which shows. Further, the reception efficiency difference amount information includes information indicating whether or not the base station apparatus 20 adopts the configuration in which the reception power confirmation signals are simultaneously transmitted from the plurality of transmission apparatuses 40 as in the first embodiment. It is good as well.

  Similar to the transmission signal acquisition unit 47 a, the transmission signal acquisition unit 47 b acquires a transmission signal to be transmitted to the mobile station device 10 and outputs the transmission signal to the modem unit 43. This transmission signal includes a transmission signal that constitutes a reception power confirmation signal that is transmitted simultaneously, and a transmission signal that constitutes a communication signal transmitted to each mobile station apparatus 10.

  The transmission signal acquisition unit 47b includes the reception efficiency difference information input from the reception efficiency difference information acquisition unit 49 in the reception power confirmation signal. A specific example of this will be described with reference to FIG. FIG. 6 is a diagram illustrating a format of a CCH signal used as a reception power confirmation signal. As shown in the figure, the CCH signal includes 64-bit information, and the 8-bit of the first octet includes a 1-bit “CS type”. This “CS type” is the reception efficiency difference amount information. Here, “CS type” is 1-bit information. However, when detailed information is included in the reception efficiency difference information as described above, “CS type” may be 2 bits or more. It is.

  The base station apparatus 20 transmits the reception efficiency difference information included in the reception power confirmation signal in this way to the mobile station apparatus 10 via the modulation / demodulation unit 43, each transceiver 42-m, and the adaptive array antenna 41. To do.

  The antenna 50 receives the incoming signal and outputs it to the transceiver 51. The transceiver 51 amplifies the input signal and outputs it to the modem unit 52. The modem unit 52 demodulates the input signal and outputs it to the received signal acquisition unit 53.

  The received signal acquisition unit 53 acquires a received signal based on the demodulation result of the modem unit 52 and outputs the received power to the received power acquisition unit 59.

  The communication processing unit 54 performs processing related to communication processing such as communication start processing, communication continuation processing, and handover processing in accordance with the reception signal input from the reception signal acquisition unit 53.

  The reception power acquisition unit 59 acquires the reception power of the reception power confirmation signal based on the reception power input from the reception signal acquisition unit 53 and outputs the reception power confirmation signal to the call start availability determination unit 58.

  The reception efficiency difference amount information acquisition unit 55 acquires reception efficiency difference amount information from the reception power confirmation signal acquired by the reception signal acquisition unit 53 and outputs the reception efficiency difference amount information to the required reception power acquisition unit 56.

  The storage unit 57 stores the required received power in association with the reception efficiency difference information. This required reception power is the minimum reception power necessary for the mobile station apparatus 10 to start communication with the base station apparatus 20. The storage unit 57 stores smaller required received power in association with the reception efficiency difference information as the difference in reception efficiency indicated by the reception efficiency difference information is larger.

  The required received power acquisition unit 56 acquires the required received power based on the reception efficiency difference information input from the reception efficiency difference information acquisition unit 55. Specifically, the required reception power is acquired by reading the required reception power stored in the storage unit 57 in association with the reception efficiency difference information input from the reception efficiency difference information acquisition unit 55. The required received power acquisition unit 56 outputs the required received power acquired in this way to the call start availability determination unit 58.

  Based on the received power of the received power confirmation signal input from the received power acquisition unit 59 and the required received power input from the required received power acquisition unit 56, the call start availability determination unit 58 It is determined whether or not communication with the base station apparatus 20 that has transmitted the signal can be started. More specifically, the call start availability determination unit 58 determines that communication with the base station apparatus 20 can be started when the reception power of the reception power confirmation signal is equal to or higher than the required reception power. On the other hand, when the reception power of the reception power confirmation signal is lower than the required reception power, the call start availability determination unit 58 determines that communication with the base station device 20 cannot be started. The call start availability determination unit 58 outputs the determination result to the communication processing unit 54.

  The communication processing unit 54 starts communication processing for the base station apparatus 20 when a determination result indicating that communication can be started is input from the call start availability determination unit 58. Specifically, the communication processing unit 54 first transmits a communication start request. The base station device 20 receives this communication start request and starts communication processing with the mobile station device 10. In this way, communication between the mobile station device 10 and the base station device 20 is started.

  On the other hand, when the determination result that the communication start is impossible is input from the call start availability determination unit 58, the communication processing unit 54 waits until the determination result that the communication start is possible is input. That is, communication between the mobile station device 10 and the base station device 20 is not started.

  Of the processes described above, the process of the mobile station apparatus 10 will be described again in detail with reference to the flowchart of the process.

  FIG. 7 is a flowchart of processing of the mobile station apparatus 10. In the figure, the mobile station apparatus 10 uses CCH as a reception power confirmation signal. Also, the base station apparatus 20 will be described as having only two types, one that performs directional transmission (adaptive array base station) and one that does not perform (omni base station).

  First, the mobile station apparatus 10 receives and demodulates CCH (S200). Next, the mobile station apparatus 10 determines the type of the base station apparatus 20 (CCH transmission source base station) that transmitted the CCH based on the reception efficiency difference information included in the CCH (S201).

  When the determination result in S201 indicates that the CCH transmission source base station is an omni base station, the mobile station apparatus 10 sets the call determination level (required received power) to the determination level A (S202, S203). On the other hand, when the determination result of S201 indicates that the CCH transmission source base station is an adaptive array base station, the mobile station apparatus 10 sets the call determination level (required received power) to the determination level B (S202, S204). Here, the determination level A is higher than the determination level B.

  Next, the mobile station apparatus 10 acquires the reception level (reception power) of CCH (S205). The mobile station device 10 compares the reception level acquired here with the call determination level (S206). If the acquired reception level is equal to or higher than the call determination level, the mobile station apparatus 10 determines that it is currently within the service area range of the CCH transmission source base station, and starts communication processing (S207). On the other hand, when the acquired reception level is smaller than the call determination level, the mobile station apparatus 10 determines that it is currently out of the service area area of the CCH transmission source base station, and does not start the communication process (S208).

  As described above, the mobile station apparatus 10 determines whether or not the base station apparatus 20 to be communicated with is a base station apparatus 20 having a reception efficiency different between the reception power confirmation signal and the communication signal. It is possible to determine whether communication can be started.

1 is a system configuration diagram of a mobile communication system according to Embodiments 1 and 2 of the present invention. It is a system configuration | structure figure of the base station apparatus which concerns on Embodiment 1 of this invention. It is a flowchart of a process of the base station apparatus which concerns on Embodiment 1 of this invention. It is a system configuration | structure figure of the base station apparatus which concerns on Embodiment 2 of this invention. It is a system configuration | structure figure of the mobile station apparatus which concerns on Embodiment 2 of this invention. It is a signal format figure of CCH which concerns on Embodiment 2 of this invention. It is a flowchart of a process of the mobile station apparatus which concerns on Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Mobile communication system, 10 Mobile station apparatus, 20 Base station apparatus, 30 Communication network, 40 Transmitting apparatus, 41 Adaptive array antenna, 42 Transmitter / receiver, 43 Modulator / demodulator, 44 Controller, 45 Transmitter integrated separator, 46 Orientation Sex determination unit, 47a, 47b transmission signal acquisition unit, 48 adaptive array calculation unit, 49 reception efficiency difference information acquisition unit, 50 antenna, 51 transceiver, 52 modulation / demodulation unit, 53 reception signal acquisition unit, 54 communication processing unit, 55 Reception efficiency difference information acquisition unit, 56 required reception power acquisition unit, 57 storage unit, 58 call start availability determination unit, 59 reception power acquisition unit.

Claims (3)

In a mobile communication system comprising a base station device and a mobile station device,
The base station device
Hand stage that sends the base station type indicating whether the base station apparatus by the own station to directional transmission of communication signals,
A reception power confirmation signal transmitting means for omnidirectionally transmitting a reception power confirmation signal used as a reference for determining whether communication can be started in the mobile station device ;
Including
The mobile station device
Receiving means for receiving the base station type and the received power confirmation signal from the base station device ;
Received power acquisition means for acquiring received power when the reception power confirmation signal is received by the receiving means;
Determining means for determining whether or not communication with the base station apparatus can be started based on the base station type received by the receiving means and the received power acquired by the received power acquiring means;
Only including,
The determination means includes
When the base station apparatus is configured to omnidirectionally transmit a communication signal, if the received power acquired by the received power acquisition unit is equal to or higher than the first required received power, communication with the base station apparatus is started. Judging that it is possible,
If the base station apparatus is to transmit the communication signal directionally, if the received power acquired by the received power acquisition means is equal to or higher than the second required received power smaller than the first required received power, Determining that communication with the base station apparatus can be started;
A mobile communication system. From a base station device for omnidirectional transmission confirmation received power signal used as a reference for determining communication start permission, the base indicating whether the base station apparatus base station apparatus to directional transmission of communication signals Receiving means for receiving a station type and the received power confirmation signal;
Received power acquisition means for acquiring received power when the reception power confirmation signal is received by the receiving means;
Determining means for determining whether or not communication with the base station apparatus can be started based on the base station type received by the receiving means and the received power acquired by the received power acquiring means;
Only including,
The determination means includes
When the base station apparatus is configured to omnidirectionally transmit a communication signal, if the received power acquired by the received power acquisition unit is equal to or higher than the first required received power, communication with the base station apparatus is started. Judging that it is possible,
If the base station apparatus is to transmit the communication signal directionally, if the received power acquired by the received power acquisition means is equal to or higher than the second required received power smaller than the first required received power, Determining that communication with the base station apparatus can be started;
Mobile station apparatus, wherein the this. In a mobile communication system comprising a base station device and a mobile station device, a communication start availability determination method for determining whether the mobile station device can start communication with the base station device,
From the base station apparatus, and Luz step to transmit the base station type indicating whether the base station apparatus by the own station to directional transmission of communication signals,
From the base station apparatus , a reception power confirmation signal transmission step for omnidirectionally transmitting a reception power confirmation signal used as a reference for determining whether communication can be started in the mobile station apparatus ;
In the mobile station apparatus, a reception step of receiving the base station type and the received power confirmation signal;
In the mobile station apparatus, a reception power acquisition step of acquiring reception power when the reception power confirmation signal is received in the reception step;
A determination step of determining whether or not communication with the base station device can be started based on the base station type received in the reception step and the reception power acquired in the reception power acquisition step; ,
Only including,
In the determination step, the mobile station apparatus
When the base station apparatus is to transmit a communication signal omnidirectionally, if the reception power acquired in the reception power acquisition step is equal to or higher than a first required reception power, communication with the base station apparatus is started. Judging that it is possible,
If the base station apparatus is to transmit a communication signal directionally, if the received power acquired in the received power acquisition step is equal to or higher than a second required received power smaller than the first required received power, Determining that communication with the base station apparatus can be started;
Communication start permission determination wherein a call.

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