JP2009021976A - Wireless communication system, wireless base station, mobile station, and wireless communication method - Google Patents

Abstract

An adaptive signal processing in a wireless communication system is effectively performed.
A mobile station 100 and a radio base station 10 perform communication by a TDMA-TDD system, and the mobile station 100 receives a call signal from the radio base station 10 or links based on a spontaneous operation from the mobile station. In the wireless communication system, the mobile station 100 transmits a link channel establishment request signal, and the radio base station 10 transmits a link channel assignment signal after a predetermined time by receiving the link channel establishment request signal. The transmitter 124 that transmits a predetermined signal after transmission and before the radio base station 10 transmits a link channel assignment signal, the radio base station 10 includes a receiver 26 that receives the predetermined signal, and the known predetermined signal received And an adaptive signal processing unit 30 that calculates a weight value by performing adaptive signal processing using the portion. Temu.
[Selection] Figure 1

Description

  The present invention relates to a radio communication system, a radio base station, a mobile station, and a radio communication method.

  In recent mobile communication, in order to cope with stabilization of communication, higher speed, increase in the number of accommodated users, etc., many studies have been made on using adaptive signal processing technology.

  In this adaptive signal processing technique, signal processing such as weighting and combining signals obtained for each antenna element such as AAA (adaptive array antenna) or AAS (Adaptive Antenna System) is adaptively performed. Control techniques and control techniques that adaptively perform signal processing such as weighted synthesis for each delayed signal, such as an adaptive filter.

  A technique such as an adaptive array antenna enables spatial division multiple access (SDMA) in which a plurality of communication partners at the same frequency and the same timing are separated and communicated.

  A technique for multiplexing communication channels by utilizing this spatial multiplexing technique for a TDMA-TDD communication system such as PHS has been devised (see Patent Document 1).

At this time, it is generally known that transmission can be performed to a desired communication partner with a gain similar to that at the time of reception by using the weighting value obtained by the reception adaptive array antenna at the time of transmission.
JP 2001-285187 A

  As described above, in order to use the weight value obtained at the time of reception at the time of transmission, it is effective that the communication partner or other interference wave source desired at the time of reception and transmission of the weight value is obtained. It is desirable that the radio wave propagation environment with the other communication device is the same or close.

  On the other hand, in the TDMA-TDD system, the time at which each communication device performs reception and the time at which transmission is performed are different, and the radio wave propagation environment differs to some extent between transmission and reception.

  The change in the radio wave propagation environment changes at a speed corresponding to the speed at which the desired communication partner, the interference wave source, the communication device itself that is trying to communicate, and the object that reflects and absorbs the radio wave move.

  For this reason, when adaptive signal processing such as an adaptive array antenna is performed for transmission, control information such as a weight value obtained by reception must be applied to the transmission side within a time when it is considered effective.

For this reason, until now, when an exchange with a short time interval from reception to transmission is performed, for example, in the case of Patent Document 1, from the transmission to the reception in the case of the exchange on the PHS traffic channel (TCH). If the moving speed of a mobile station or the like is a general life level, it is possible to perform adaptive signal processing in transmission without any problem.
However, when the time interval between transmission and reception in communication between communication devices is relatively large compared to the above, for example, a control channel (CCH: Control Channel) frame structure as shown in FIG. In a system in which a radio base station and a mobile station can transmit and receive every 100 milliseconds, for example, as shown in the allocation sequence in the conventional PHS in FIG. 11, uplink from the mobile station (mobile station transmission = Rx radio base station reception) ) LCH (link channel) establishment request is transmitted by SCCH (SCCH1 in FIG. 11) (S11), the radio base station starts allocation processing (S12), and the radio base station allocates LCH by downlink (radio base station transmission) SCCH. It takes at least 97.5 milliseconds (in FIG. 11, n is a natural number including 0) to respond (S13) Communication establishment (S14) has been reached, but in this case, since the time interval is much longer than the exchange in the traffic channel, the radio wave propagation environment changes greatly, and the adaptive signal processing for transmission to the mobile station at the radio base station Specifically, the allowable speed of the mobile station that can obtain the effect of the adaptive array antenna becomes very small, which is not practical.

  The present invention has been made in view of the above problems, and its object is to apply wireless communication with higher accuracy with respect to communication quality by adaptive signal processing such as spatial multiplexing, and to obtain a sufficient communication quality improvement effect. A communication system, a radio base station, a mobile station, and a radio communication method are provided.

  In order to solve the above problems, the mobile station and the radio base station according to the present invention perform communication by the TDMA-TDD system, and the mobile station receives a call signal from the radio base station or performs a spontaneous operation from the mobile station. In the wireless communication system, the mobile station transmits a link channel establishment request, and the radio base station transmits a link channel assignment signal after a predetermined time by receiving the link channel establishment request signal. After transmitting the signal and before the radio base station transmits the link channel assignment signal, the transmitter transmits the predetermined signal, the radio base station receives the predetermined signal, and a known part of the received predetermined signal. And an adaptive signal processing unit for calculating a weight value using the adaptive signal processing unit.

  The radio base station according to the present invention further includes a predetermined signal determining unit that determines whether or not a predetermined signal is transmitted from the mobile station based on the link channel establishment request signal, and the base station receiving unit includes the predetermined signal When it is determined that the predetermined signal is transmitted, a predetermined signal is received. When it is determined that the predetermined signal is not transmitted, the time for receiving the predetermined signal is released.

  In addition, the radio base station according to the present invention includes a transmission determination unit that determines whether or not a link channel assignment signal can be transmitted after a predetermined time when the predetermined signal determination unit determines that the predetermined signal is transmitted, and a transmission determination And a stop signal transmitter that transmits a stop signal that causes the mobile station to stop transmitting the predetermined signal when the unit determines that the link channel assignment signal cannot be transmitted after the predetermined time, and the mobile station transmitter The transmission of the predetermined signal is stopped by the signal, and the base station receiving unit frees the time for receiving the predetermined signal even when it is determined that the link channel assignment signal cannot be transmitted after the predetermined time.

  Further, the stop signal transmission unit according to the present invention transmits the stop signal including a timing at which the radio base station can transmit the link channel assignment signal, and the mobile station transmission unit transmits the stop signal at a timing before the transmission possible timing. The predetermined signal is transmitted, and the base station receiving unit receives the predetermined signal at a timing before the transmission timing.

  The radio base station according to the present invention includes a transmission signal processing unit that weights the link channel assignment signal based on the weight value obtained by the adaptive signal processing unit.

  The paging signal according to the present invention is a general paging channel in PHS, and the link channel establishment request signal is a link channel establishment request transmitted from the mobile station to the radio base station through the dedicated cell channel in PHS. The link channel assignment signal is a link channel assignment transmitted from the radio base station to the mobile station by the dedicated cell channel in the PHS, and the mobile station ID is a PS-ID in the PHS.

  The predetermined signal according to the present invention is characterized in that the allocation information of the link channel establishment request signal is a synchronization word in PHS.

  In addition, the predetermined signal according to the present invention includes at least the code different for each mobile station in the predetermined signal.

  In addition, the mobile station according to the present invention includes a mobile station storage unit that stores different mobile station IDs for each mobile station, and a code different for each mobile station is generated based on the mobile station ID. .

  Further, the mobile station according to the present invention includes a code spread modulation unit that performs code spread modulation on a transmission signal of the mobile station, and the radio base station receives a signal that has been code spread modulated by the code spread unit, and performs code spread demodulation. A code spread demodulator that performs different codes for each mobile station is generated by a code spread modulator based on a spread code that is different for each mobile station. And demodulating a predetermined signal from.

  A mobile station according to the present invention includes a mobile station storage unit that stores a mobile station ID that is different for each mobile station, and the code spread modulation unit generates a spread code based on the mobile station ID.

  In addition, the mobile station and the radio base station according to the present invention perform communication by the TDMA-TDD scheme, and the mobile station establishes a link channel based on reception of a paging signal from the radio base station or spontaneous operation from the mobile station. In the radio base station of the radio communication system, the radio base station transmits the link channel assignment request signal after a predetermined time by receiving the link channel establishment request signal. After transmitting the channel establishment request signal and before the radio base station transmits the link channel assignment signal, a base station receiving unit that receives a predetermined signal transmitted by the mobile station, and a weight using a known part of the received predetermined signal And an adaptive signal processing unit for calculating a value.

  In addition, the mobile station further includes a predetermined signal determining unit that determines whether a predetermined signal is transmitted from the mobile station based on the link channel establishment request signal according to the present invention, and the base station receiving unit receives the predetermined signal. If it is determined, a predetermined signal is received, and if it is determined that the predetermined signal is not transmitted, the time for receiving the predetermined signal is released.

  In addition, the mobile station and the radio base station according to the present invention perform communication by the TDMA-TDD system, and the mobile station receives a call signal from the radio base station or establishes a link channel based on a spontaneous operation from the mobile station. In the mobile station of the wireless communication system, the mobile station transmits a link channel assignment request signal after a predetermined time by receiving the link channel establishment request signal. And a mobile station transmitter that transmits a predetermined signal after transmission and before the radio base station transmits a link channel assignment signal.

  In addition, the mobile station and the radio base station according to the present invention perform communication by the TDMA-TDD system, and the mobile station receives a call signal from the radio base station or establishes a link channel based on a spontaneous operation from the mobile station. In a wireless communication method of a wireless communication system, a mobile station transmits a link channel establishment request signal by transmitting a request signal, and the wireless base station transmits a link channel assignment signal after a predetermined time by receiving the link channel establishment request signal. Transmitting the predetermined signal after the transmission of the wireless channel and before the wireless base station transmits the link channel assignment signal, the wireless base station receiving the predetermined signal, and weighting using the known portion of the received predetermined signal And a step of calculating a value.

  Further, based on the link channel establishment request signal received by the radio base station according to the present invention, the mobile station determines whether or not to transmit a predetermined signal, and if it is determined that the predetermined signal is transmitted, the predetermined signal is When it is determined that the predetermined signal is not transmitted, the time for receiving the predetermined signal is released.

  As described above, according to the wireless communication system of the present invention, it is possible to apply with higher accuracy with respect to communication quality by adaptive signal processing such as spatial multiplexing, and to sufficiently obtain the effect of improving communication quality.

  In addition, since the time for the radio base station to receive a signal transmitted by the mobile station is released depending on the type of the mobile station, it is possible to effectively use the time for receiving the signal without wasting it.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a system configuration diagram of a radio communication system according to an embodiment of the present invention. As shown in FIG. 1, the radio communication system 1 includes a radio base station 10 and a plurality of mobile stations 100A, 100B, 100C, and 100N. Hereinafter, the content common to each mobile station is referred to as the mobile station 100.

  The radio base station 10 performs radio communication with the mobile station 100 in the communication area 50. The radio base station 10 includes an adaptive array device, and can perform radio communication with a plurality of mobile stations by a spatial multiplexing method.

  The mobile station 100 is an information terminal that performs mobile communication such as a PHS and a mobile phone. In the present embodiment, the mobile station 100 and the radio base station 10 perform radio communication based on the PHS standard or the extended PHS standard. The mobile station 100 and the radio base station 10 perform radio communication using communication frames multiplexed by time division multiplexing (TDMA) and spatial multiplexing (SDMA).

  Specifically, one TDMA / TDD (Time Division Duplex: Time Division Duplex) frame is time division multiplexed into four time slots that are a set of a transmission time slot and a reception time slot according to the PHS standard. Each time slot is spatially multiplexed into a plurality of channels. Here, one of the time slots at a certain frequency is used as a control channel (CCH), and the remaining frequency is used as a communication channel (TCH).

  FIG. 2 is a functional block diagram illustrating functions of the radio base station 10. As shown in FIG. 2, the radio base station 10 includes a base station radio unit 20, an adaptive signal processing unit 30, a base station baseband processing unit 40, a line modem unit 60, and a base station control unit 70 as functional configurations. including. Each unit is a function realized using the hardware of the radio base station 10. Details of each part will be described below.

  The base station radio unit 20 converts a baseband (BB: Base Band) or intermediate frequency (IF) signal that is a frequency band of the modulation signal from the adaptive signal processing unit 30 into a radio signal frequency, and converts the baseband (BB) signal into a plurality of base stations. The base station transmitter 24 supplied to each of the station radio antennas 22 and the frequency of the carrier signal by amplifying the radio signal received for each of the plurality of base station radio antennas 22 to the power required to send to the adaptive signal processor 30 And a base station receiving unit 26 for converting from baseband to baseband or intermediate frequency.

  The base station receiving unit 26 receives a predetermined signal when it is determined that a predetermined signal is transmitted from the mobile station 100 described later, and receives a predetermined signal when it is determined that the predetermined signal is not transmitted. Free up time elsewhere.

  In the present embodiment, the base station receiving unit 26 also releases time for receiving a predetermined signal even when a transmission determination unit 74 described later determines that an LCH allocation signal cannot be transmitted after a predetermined time.

  The adaptive signal processing unit 30 receives a radio signal received from the base station reception unit 26 for each base station radio antenna 22, performs reception adaptive signal processing, and outputs the received signal to the base station baseband unit 40. A transmission signal processing unit 32 that performs signal processing on the baseband transmission signal input from the processing unit 34 and the base station baseband unit 40 based on information related to the wireless environment obtained by the reception / adaptive signal processing unit 34. And composed of

  Specifically, the reception / adaptive signal processing unit 34 uses a known signal included in a predetermined signal transmitted from the mobile station, based on a phase of a signal that differs for each base station radio antenna 22, and the like from a desired mobile station. The phase and amplitude are weighted for each signal from the base station radio antenna 22 so as to obtain a gain in the signal. Thus, a reception adaptive array antenna is configured. In addition, a transmission adaptive array antenna that can obtain a transmission gain for a mobile station that is a desired communication partner is configured by performing weighting values, which are information related to the wireless environment, on the antenna on the transmission side.

  The base station baseband processing unit 40 includes a base station modulation unit 42 and a base station demodulation unit 44, and the base station modulation unit 42 performs modulation processing of a downlink (downlink) signal transmitted to the mobile station. It has a function. The downlink signal is a signal based on information necessary for the radio base station 10 to execute various communication protocols generated by the base station control unit 70 or information received from the exchange (not shown) via the line modem unit 60. The downlink signal thus transmitted is transmitted to each mobile station 100 by the base station radio unit 20 via the adaptive signal processing unit 30.

  The base station demodulation unit 44 has a function of performing demodulation processing on an uplink (Up Link) signal received from the mobile station and acquiring information related to a communication state with the mobile station. The base station demodulator 44 demodulates the signal input through the adaptive signal processor 30. The demodulated signal passes through the line modem unit 60, and communication information to be sent to the line is transmitted to the line side through the line modem unit 60. Information relating to the exchange with the mobile station 100 is sent to the base station control unit 70.

  The line modem unit 60 modulates and demodulates signals in communication between the radio base station 10 and the exchange.

  The base station control unit 70 includes a processor, a memory, and the like, and has a function of controlling each unit of the radio base station 10 in addition to performing processing based on information obtained by signal processing.

  In the present embodiment, the base station control unit 70 also functions as a predetermined signal determination unit 72, a transmission determination unit 74, and a stop signal transmission unit 76.

  The predetermined signal determination unit 72 determines whether or not a predetermined signal is transmitted from the mobile station 100 based on the LCH establishment request signal transmitted by the mobile station 100.

  If the mobile station that transmitted the LCH establishment request signal is a mobile station that does not transmit the predetermined signal, the predetermined signal does not come at the time when the predetermined signal is received by the radio base station 10. Accordingly, even if the predetermined signal is received by monopolizing the time for receiving the predetermined signal of the radio base station 10, the predetermined signal does not come, so that the time for receiving is wasted.

  When the predetermined signal determination unit 72 determines that the predetermined signal determination unit 72 is not a mobile station that transmits the predetermined signal due to the configuration including the predetermined signal determination unit 72, the time for receiving the predetermined signal is released in order to release the time for receiving the predetermined signal. Can be used effectively without wasting them.

  When the predetermined signal determination unit 72 determines that the predetermined signal is transmitted from the mobile station 100, the transmission determination unit 74 determines whether or not the LCH allocation signal can be transmitted after a predetermined time.

  When the transmission determination unit 74 determines that the LCH allocation signal cannot be transmitted after a predetermined time, the stop signal transmission unit 76 transmits a stop signal that causes the mobile station 100 to stop transmitting the predetermined signal via the base station transmission unit 24. To do.

  A control signal (LCCH: Logical Control Channel) such as a paging signal or an LCH allocation signal transmitted by the radio base station 10 is determined by a minimum cycle that designates a slot position of the LCCH used in the radio communication system 1 that is generally called a superframe. A transmission slot, that is, a transmission time (predetermined time) is determined. Therefore, the radio base station 10 may not be able to transmit the LCH allocation signal at a predetermined time due to the superframe configuration. Further, when carrier sense is not performed between the radio base station 10 and the mobile station 100, the LCH allocation signal may not be transmitted at a predetermined time even in *** and the like. For the various reasons described above, when performing wireless communication with the mobile station 100 that transmits a predetermined signal, the radio base station 10 may not be able to transmit the LCH allocation signal at a predetermined time immediately after receiving the predetermined signal.

  Thus, the configuration including the transmission determination unit 74 can determine whether or not the LCH allocation signal can be transmitted when performing wireless communication with the mobile station 100 that transmits the predetermined signal, and determines that the LCH allocation signal cannot be transmitted. In this case, the mobile station 100 transmits a stop signal that stops transmission of the predetermined signal. Therefore, the mobile station 100 does not transmit a predetermined signal when the radio base station 10 cannot transmit the LCH allocation signal.

  Further, the base station receiving unit 26 also wastes time to receive the predetermined signal in order to release the time for receiving the predetermined signal even when it is determined that the LCH allocation signal cannot be transmitted after the predetermined time. It can be used effectively without any problems.

  In the present embodiment, the stop signal transmission unit 76 transmits the stop signal including the timing at which the radio base station 10 can transmit the LCH allocation signal.

  FIG. 3 is a functional block diagram illustrating functions of the mobile station 100. As shown in FIG. 3, the mobile station 100 includes, as functional configurations, a mobile station radio unit 120, a mobile station baseband processing unit 140, an application interface unit 160, a mobile station control unit 170, and a mobile station storage unit 180. including. Each unit is a function realized using hardware of the mobile station 100. Details of each part will be described below.

  The mobile station radio unit 120 converts a baseband (BB: Base Band) or intermediate frequency (IF) signal, which is a frequency band of a modulation signal from the mobile station baseband unit 140, into a radio signal frequency, and moves The mobile station transmission unit 124 supplied to the station radio antenna 122 and the radio signal received by the mobile station radio antenna 122 are amplified to the power necessary to send the signal to the mobile station baseband unit 140, and the baseband is calculated from the frequency of the carrier signal. Alternatively, the mobile station receiving unit 126 that converts to an intermediate frequency is included.

  In the present embodiment, the mobile station transmission unit 124 stops transmission of a predetermined signal when the mobile station reception unit 126 receives a stop signal transmitted from the stop signal transmission unit 76 of the radio base station 10.

  In addition, the mobile station transmission unit 124 transmits a predetermined signal at a timing closest to the timing at which the radio base station 10 included in the stop signal can transmit the LCH allocation signal.

  The mobile station baseband processing unit 140 includes a mobile station modulation unit 142 and a mobile station demodulation unit 144, and the mobile station modulation unit 142 has a function of performing modulation processing on an uplink signal transmitted to the radio base station 10. The uplink signal is generated by the mobile station control unit 170 by the mobile station 100, and includes a predetermined signal necessary for performing adaptive signal processing in the radio base station, a signal necessary for performing various communication protocols, The signal is based on information input from the application interface unit 160 and received from a higher-level application such as voice processing and data packet communication included in the device of the mobile station 100 (not shown). The uplink signal thus transmitted is transmitted to the mobile station 100 by the radio unit 120.

  The mobile station demodulation unit 144 performs demodulation processing on the signal input via the mobile station radio unit 120. The demodulated signal is a signal necessary for the mobile station control unit 170 to perform a communication protocol with the radio base station, and also is a voice included in a mobile station device (not shown) output to the application interface unit 160. This is a signal for information supplied to a higher-level application such as processing or data packet communication.

  The application interface unit 160 exchanges information obtained by transmission / reception of a radio signal with a higher-level application such as voice processing or data packet communication included in a mobile station device (not shown) included in the mobile station 100 device.

  The mobile station control unit 70 includes a processor, a memory, and the like, and has a function of controlling each unit of the mobile station 100 in addition to performing processing based on information obtained by signal processing.

  Hereinafter, an operation procedure of the present invention will be described by showing a frame configuration in the wireless communication system of the present embodiment and a sequence diagram showing exchange between the wireless base station and the mobile station.

  FIG. 4 is a diagram showing an allocation slot configuration in the present embodiment.

  Conventionally, as shown in FIG. 10, when the LCH establishment request from the mobile station is received by the radio base station via the uplink SCCH, the radio base station is at least 97.5 milliseconds, and generally 97.5 + 100n (n is 0). LCH allocation is performed by downlink SCCH after a natural number including milliseconds). On the other hand, in the allocation slot configuration in the present invention shown in FIG. 4, at a timing at which the radio base station can receive an uplink signal that can be received at a timing closest to the timing at which the radio base station performs LCH allocation using the downlink SCCH. A certain time is 2.5 msec before the LCH establishment request is transmitted from the mobile station, that is, a predetermined signal is transmitted again from the mobile station after 95.0 + 100 n milliseconds, and the radio base station receives the desired signal at this timing. To do.

  The above operation will be described with reference to the allocation sequence in the present invention shown in FIG. 5. The mobile station receives a call signal (simultaneous call PCH in PHS) from the radio base station in advance, or the mobile station performs a user operation. The LCH establishment request (S1) is made by SCCH (hereinafter referred to as SCCH1) based on the voluntary operation, and the allocation process (S2) is started when the radio base station receives the request. On the other hand, the mobile station transmits an LCH establishment request by SCCH (hereinafter referred to as SCCH2) that becomes a predetermined signal at a timing that is a reception timing at the radio base station immediately before the radio base station transmits LCH allocation by SCCH (S3). The SCCH2 is an LCH establishment request (UW extension message) in FIG. 5, but details thereof will be described later.

  A radio base station that has received SCCH2 that is a predetermined signal uses a known signal (UW in the example of FIG. 5) included in this signal, performs adaptive signal processing such as adaptive array antenna processing, and performs a weight value (weight) for each antenna. ) Is calculated (S4).

  The radio base station multiplies the transmission signal by this weight value by transmission signal processing, configures a transmission adaptive array antenna (AAA), and transmits LCH allocation by SCCH to the mobile station (S5). As a result, communication is established between the radio base station and the mobile station (S6).

  By doing so, it has been difficult to obtain the effectiveness of adaptive signal control for the exchange of control signals in the past, but by implementing the present invention, LCH allocation is performed after the radio base station receives SCCH2. The time lapse until it can be performed can be implemented from 2.5 milliseconds. As a result, a transmission adaptive array antenna can be implemented even for control signals such as LCH allocation from a radio base station, The immunity can be equivalent to that of the adaptive array antenna implemented in the traffic channel.

  FIG. 6 is a diagram showing another allocation slot configuration in the present embodiment.

  In the allocation slot configuration shown in FIG. 6, the radio base station 10 receives the uplink SCCH1, transmits a stop signal including the timing for performing LCH allocation on the downlink SCCH based on the received SCCH1, and performs LCH allocation on the downlink SCCH. After transmitting the LCH establishment request from the mobile station 2.5 msec before the reception of the uplink signal that can be received by the radio base station at the timing closest to the timing based on the stop signal to be performed, that is, in general Then, a predetermined signal is transmitted again from the mobile station after 95.0 + 100 n milliseconds, and the radio base station receives the desired signal at this timing.

  FIG. 7 is a diagram showing another allocation sequence in the present embodiment, and FIG. 8 is a flowchart summarizing the allocation sequence in the present embodiment. Here, the operation shown in FIG. 6 will be described with reference to the assignment sequence shown in FIG. In addition, about the component which a function is substantially equal to embodiment shown in FIG.4 and FIG.5 mentioned above, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  First, the mobile station 100 receives a call signal (simultaneous call PCH in PHS) from the radio base station 10 in advance, or the mobile station 100 requests an LCH establishment by SCCH (hereinafter referred to as SCCH1) based on a spontaneous operation by a user operation or the like. (S1) is performed, the radio base station 10 receives the LCH establishment request signal (S100), and starts the allocation process (S2). The wireless base station determines whether or not a predetermined signal is transmitted from the mobile station 100 based on the received LCH establishment request signal in the predetermined signal determination unit (S102).

  In S102, when it is determined that the predetermined signal is not transmitted from the mobile station 100, the base station reception unit releases time for receiving the predetermined signal.

  On the other hand, when it is determined in S102 that the predetermined signal is transmitted from the mobile station 100, the transmission determination unit determines whether or not the LCH allocation signal can be transmitted after a predetermined time (S104). In S104, when it is determined that the radio base station cannot transmit the LCH allocation signal after a predetermined time, the stop signal transmission unit transmits a stop signal that stops the mobile station from transmitting the predetermined signal (S106). At this time, the base station receiving unit releases time for receiving the predetermined signal even when it is determined that the LCH allocation signal cannot be transmitted after the predetermined time.

  On the other hand, the mobile station issues an LCH establishment request by SCCH (hereinafter referred to as SCCH2) that is a predetermined signal at a timing that is a reception timing at the radio base station immediately before a timing at which the radio base station included in the stop signal can transmit LCH allocation by SCCH. Transmit (S108).

  The radio base station that has received SCCH2 that is a predetermined signal uses a known signal included in this signal, performs adaptive signal processing, for example, adaptive array antenna processing, and calculates a weight value (weight) for each antenna (S4).

  The radio base station multiplies the transmission signal by this weight value by transmission signal processing, configures a transmission adaptive array antenna (AAA), and transmits LCH allocation by SCCH to the mobile station (S5). As a result, communication is established between the radio base station and the mobile station (S6).

  If the radio base station receives an LCH establishment request signal from a mobile station that can transmit a predetermined signal, but cannot transmit an LCH allocation signal after a predetermined time, a predetermined signal transmitted from the mobile station before the predetermined time is transmitted. There is no need to receive. Therefore, with the configuration including the transmission determination unit described above, it is possible to determine whether or not the LCH allocation signal can be transmitted when performing radio communication with the mobile station 100 that transmits the predetermined signal, and it is determined that the LCH allocation signal cannot be transmitted. In this case, the mobile station 100 transmits a stop signal that stops transmission of the predetermined signal. Therefore, the mobile station 100 does not transmit a predetermined signal when the radio base station 10 cannot transmit the LCH allocation signal.

  Further, the base station receiving unit 26 also wastes time to receive the predetermined signal in order to release the time for receiving the predetermined signal even when it is determined that the LCH allocation signal cannot be transmitted after the predetermined time. It can be used effectively without any problems.

  Furthermore, since the stop signal transmitter 76 transmits the stop signal including the timing at which the radio base station 10 can transmit the LCH allocation signal, the mobile station confirms the timing at which the radio base station 10 can reliably transmit the LCH allocation signal. can do. Therefore, it is possible to transmit an LCH establishment request by SCCH (hereinafter referred to as SCCH2) serving as a predetermined signal at a timing that is a reception timing at the radio base station immediately before the timing at which the LCH allocation can be transmitted.

  FIG. 9 shows an example of a predetermined signal transmitted from the mobile station by the above-described SCCH2. The frame format in the upper part of FIG. 9 is a frame format used when a normal radio base station transmits an LCH establishment request. The frame format at the bottom of FIG. 6 is an example of the frame format of the predetermined signal used according to the present invention. In this example, when making a normal LCH establishment request, since the mobile station has already started allocation processing in the radio base station at the timing when the mobile station transmits the information for allocation to the radio base station on the SCCH 2 described above, Based on the fact that this allocation information is not required again, this part is replaced with UW, whereby a signal known to the radio base station can be received.

  In addition, although UW was used in the example of FIG. 9, since the wireless base station has already received the LCH establishment request from the mobile station as described above, the storage unit allocated to each mobile station and stored in the mobile station is stored in advance. By transmitting the mobile station ID (PS-ID in PHS) unique to the mobile station to the radio base station at the stage of the LCH establishment request by SCCH1, the information based on the SCCH2 mobile station ID can be included, and desired Even if transmissions from mobile stations that are not used are interfered by radio, a predetermined signal from the desired mobile station may be identified on the radio base station side.

  The mobile station further includes a code spread modulation unit (not shown) that performs code spreading on the signal to be transmitted, and the radio base station further includes a code spread demodulation unit (not shown) that performs code despreading on the received signal. In addition, by using a spreading code that has been agreed between the mobile station and the radio base station desired by SCCH1 and the like in advance, the mobile station code-spreads the above-mentioned SCCH2 signal by the code spreading and weighting part. The radio base station that has received and received this signal performs code despreading by the code spreading demodulation unit to obtain SCCH2, thereby identifying even if transmission from an undesired mobile station is interfering on the radio, and spreading It may be possible to identify a higher predetermined signal by performing amplification of a desired signal by gain and suppression of an undesired signal.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  Note that the steps in the wireless communication method of the present specification do not necessarily have to be processed in time series in the order described in the sequence diagrams and flowcharts, but are performed in parallel or individually (for example, parallel processing) Alternatively, processing by an object) may be included.

  The present invention can be used for a radio communication system, a radio base station, a mobile station, and a radio communication method.

1 is a system configuration diagram of a radio communication system according to an embodiment of the present invention. It is the functional block diagram which showed the function which a wireless base station has. It is the functional block diagram which showed the function which a mobile station has. It is a figure which shows the allocation slot structure concerning this embodiment. It is a figure which shows the allocation sequence concerning this embodiment. It is a figure which shows the other allocation slot structure concerning this embodiment. It is a figure which shows the other allocation sequence concerning this embodiment. It is the flowchart which put together the allocation sequence concerning this embodiment. It is a figure which shows the example of a frame change of the predetermined signal concerning embodiment of this invention. It is a figure which shows the allocation slot structure in the conventional PHS. It is a figure which shows the allocation sequence in the conventional PHS.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Radio communication system 1, Radio base station, 20 Base station radio | wireless part (radio base station), 22 Base station radio | wireless antenna (radio base station), 24 Base station transmission part (radio base station), 26 Base station receiver (radio | wireless) Base station), 30 adaptive signal processing unit (radio base station), 32 transmission signal processing unit (radio base station), 34 reception / adaptive signal processing unit (radio base station), 40 base station baseband processing unit (radio base station) ), 42 base station modulation unit (radio base station), 44 reverse base station adjustment unit (radio base station), 50 communication area, 60 line modem unit (radio base station), 70 base station control unit (radio base station), 72 predetermined signal determination unit, 74 transmission determination unit, 76 stop signal transmission unit 100, 100A, 100B, 100C, 100N mobile station, 120 mobile station radio unit (mobile station), 122 mobile station radio antenna (mobile station), 24 mobile station transmitter (mobile station), 126 mobile station receiver (mobile station), 140 mobile station baseband processor (mobile station), 142 mobile station modulator (mobile station), 144 mobile station demodulator (mobile station) ), 160 Application interface unit (mobile station), 170 Mobile station control unit (mobile station), 180 Mobile station storage unit

Claims (16)

The mobile station and the radio base station perform communication by the TDMA-TDD system,
The mobile station transmits a link channel establishment request based on reception of a paging signal from the radio base station or voluntary operation from the mobile station,
In the radio communication system, the radio base station transmits a link channel assignment signal after a predetermined time by receiving the link channel establishment request signal.
The mobile station transmits a predetermined signal after transmitting the link channel establishment request signal and before the radio base station transmits the link channel assignment signal; and
The radio base station includes a base station receiver that receives the predetermined signal;
An adaptive signal processing unit that calculates a weight value using a known portion of the received predetermined signal;
A wireless communication system comprising: The radio base station further includes a predetermined signal determination unit that determines whether the predetermined signal is transmitted from the mobile station based on the link channel establishment request signal,
The base station receiving unit receives a predetermined signal when it is determined that the predetermined signal is transmitted, and releases the time for receiving the predetermined signal when it is determined that the predetermined signal is not transmitted. The wireless communication system according to claim 1. The radio base station is
A transmission determination unit that determines whether or not the link channel assignment signal can be transmitted after a predetermined time when the predetermined signal determination unit determines that the predetermined signal is transmitted;
When the transmission determination unit determines that the link channel assignment signal cannot be transmitted after a predetermined time, a stop signal transmission unit that transmits a stop signal that stops the transmission of the predetermined signal to the mobile station;
Further comprising
The mobile station transmission unit stops transmission of a predetermined signal by the stop signal,
3. The wireless communication according to claim 2, wherein the base station receiving unit releases another time for receiving the predetermined signal even when it is determined that the link channel assignment signal cannot be transmitted after the predetermined time. system. The stop signal transmitter transmits a stop signal including a timing at which the radio base station can transmit a link channel assignment signal,
The mobile station transmission unit transmits a predetermined signal at a timing before the transmission timing,
The radio communication system according to claim 3, wherein the base station receiving unit receives a predetermined signal at a timing before the timing at which the transmission is possible.   The radio communication system according to claim 1, wherein the radio base station includes a transmission signal processing unit that weights the link channel assignment signal based on a weight value obtained by the adaptive signal processing unit. The call signal is a general call channel in PHS,
The link channel establishment request signal is a link channel establishment request transmitted from a mobile station to a radio base station through a dedicated cell channel in PHS.
The link channel assignment signal is a link channel assignment transmitted from a radio base station to a mobile station by a dedicated cell channel in PHS,
The mobile station ID is a PS-ID in PHS.
The wireless communication system according to claim 1, wherein the wireless communication system is a wireless communication system.   7. The wireless communication system according to claim 1, wherein the predetermined signal uses information for allocation of the link channel establishment request signal as a synchronization word in PHS.   The radio communication system according to claim 1, wherein the predetermined signal includes at least the code different for each mobile station in the predetermined signal. The mobile station includes a mobile station storage unit that stores a different mobile station ID for each mobile station,
9. The wireless communication system according to claim 1, wherein a code different for each mobile station is generated based on the mobile station ID. The mobile station includes a code spread modulation unit that performs code spread modulation on a transmission signal of the mobile station,
The radio base station includes a code spread demodulation unit that receives a signal subjected to code spread modulation by the code spread unit and performs code spread demodulation,
The code different for each mobile station is generated in the code spread modulation unit based on a spread code different for each mobile station,
The radio base station demodulates the predetermined signal from a desired mobile station by the code spread demodulation unit;
The wireless communication system according to any one of claims 1 to 6 and claim 8. The mobile station includes a mobile station storage unit that stores a different mobile station ID for each mobile station,
The radio communication system according to claim 10, wherein the code spread modulation unit generates the spread code based on the mobile station ID. The mobile station and the radio base station perform communication by the TDMA-TDD system,
The mobile station transmits a link channel establishment request signal based on reception of a paging signal from the radio base station or voluntary operation from the mobile station,
In the radio base station of the radio communication system, the radio base station transmits a link channel assignment signal after a predetermined time by receiving the link channel establishment request signal.
The radio base station receives a predetermined signal transmitted from the mobile station after the mobile station transmits the link channel establishment request signal and before the radio base station transmits the link channel assignment signal. And
An adaptive signal processing unit that calculates a weight value using a known portion of the received predetermined signal;
A radio base station comprising: A predetermined signal determination unit that determines whether or not the predetermined signal is transmitted from the mobile station based on the link channel establishment request signal;
The base station receiving unit receives a predetermined signal when it is determined that the predetermined signal is transmitted, and releases the time for receiving the predetermined signal when it is determined that the predetermined signal is not transmitted. The radio base station according to claim 12. The mobile station and the radio base station perform communication by the TDMA-TDD system,
The mobile station transmits a link channel establishment request signal based on reception of a paging signal from the radio base station or voluntary operation from the mobile station,
In the mobile station of the radio communication system, the radio base station transmits a link channel assignment signal after a predetermined time by receiving the link channel establishment request signal.
The mobile station transmits a predetermined signal after transmitting the link channel establishment request signal and before the radio base station transmits the link channel assignment signal; and
A mobile station characterized by comprising: The mobile station and the radio base station perform communication by the TDMA-TDD system,
The mobile station transmits a link channel establishment request signal based on reception of a paging signal from the radio base station or voluntary operation from the mobile station,
In the communication method of the radio communication system, the radio base station transmits a link channel assignment signal after a predetermined time by receiving the link channel establishment request signal.
The mobile station transmits a predetermined signal after transmitting the link channel establishment request signal and before the radio base station transmits the link channel assignment signal;
The radio base station receives the predetermined signal; and
Calculating a weight value using a known portion of the received predetermined signal;
A wireless communication method comprising: Determining whether the mobile station transmits a predetermined signal based on the link channel establishment request signal received by the radio base station;
If it is determined that the predetermined signal is transmitted, the predetermined signal is received;
The wireless communication method according to claim 15, wherein when it is determined that the predetermined signal is not transmitted, another time for receiving the predetermined signal is released.

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