JP6799953B2 - Terminal wireless device and control method of terminal wireless device - Google Patents

Description

The present invention relates to a terminal wireless device and a control method for the terminal wireless device, and more particularly to a time division multiple access terminal wireless device and a control method for the terminal wireless device.

Time division multiple access (TDMA) digital wireless communication systems are known. In the conventional terminal wireless device used in this system, in order to prolong the operating time, power saving control is performed during non-communication without transmitting and receiving signals. In power saving control, for example, power supply to various devices such as a CPU having relatively large power consumption is stopped during non-communication.

On the other hand, in the normal reception mode in which signals are transmitted and received, power is supplied to and received by components necessary for reception, such as a reception circuit of a wireless device for receiving signals and an ADC for A / D conversion of signals. Demodulation processing is performed on the signal. As described above, the conventional terminal wireless device switches from the power saving mode to the normal receiving mode at the start of communication, and switches from the normal receiving mode to the power saving mode when the communication ends.

In the conventional terminal radio device, in the power saving mode, the received electric field strength (hereinafter also referred to as RSSI) of the first half and the second half of the allocated slot is monitored, and when the RSSI exceeds the threshold value, the power saving mode is normally changed. The mode was switched to the reception mode (see, for example, Patent Document 1).

JP-A-2003-134027

In a multi-station simultaneous transmission system in which control signals are simultaneously transmitted from a plurality of base stations over the entire service area on the same radio channel, the base station is usually operated by a communication control device of a central station that controls each base station and a link line. It is connected. In the communication channel (Vch) for downlink voice communication from the base station to the terminal wireless device, signals having different burst lengths such as full burst during a call and half burst during a non-call are transmitted. In the terminal wireless device described in Patent Document 1, the terminal wireless device determines which burst is transmitted to determine whether the call is a call or no call, and switches between a normal reception mode and a power saving mode. It was.

If communication between the base station and the communication control device of the central station becomes impossible due to a failure, etc., the voice communication sent from the uplink from the terminal wireless device to the base station is sent within the device of the base station. It automatically switches to base station return communication that relays to the downlink for the base station.

During the return operation, a channel format signal (that is, a return operation synchronous burst) that transmits only the synchronization word (SWCH) when there is no call is transmitted on the communication channel (Vch) for downlink voice communication. This is to prevent interference with other base stations due to simultaneous transmission of multiple stations.

In the conventional terminal wireless device, it was not possible to discriminate the return operation synchronous burst. Therefore, during the return operation, it was not possible to switch from the normal reception mode to the power saving mode even though the call was not made. Therefore, there is a problem that the power consumption of the conventional terminal wireless device increases.

The present invention has been made to solve the above problems, and controls a terminal wireless device and a terminal wireless device that determine the channel format of a signal transmitted from a base station and appropriately switch to a power saving mode. The purpose is to provide a method.

The terminal wireless device according to the present invention is a terminal wireless device that receives a signal multiplexed by a time-division multiple connection method, and is a receiving unit that receives the signal and a demodulating unit that demolishes the received signal received by the receiving unit. In the slot assigned to the terminal radio device of the received signal, the detection unit that detects the received electric field strength in the first, second, and third sections and the received electric field strength in the first to third sections of the slot Based on this, a discriminating unit that discriminates the channel format of the slot from among a plurality of channel formats, and a control unit that switches the operation mode of the terminal radio device to the normal reception mode or the power saving mode according to the discriminating result of the discriminating unit. In the power saving mode, at least the function of the demodulator is stopped , the plurality of channel formats include the first, second, and third channel formats, and in the first channel format, the first, second, and third channels are used. The received electric field strength is relatively high in the section of, and in the second channel format, the received electric field strength is relatively low in the first section, and the received electric field strength is relatively high in the second and third sections. In the third channel format, the received electric field strength is relatively low in the first and second sections, and the received electric field strength is relatively high in the third section .

The control method of the terminal radio device according to the present invention is a control method of the terminal radio device that receives the signal multiplexed by the time division multiplex method, and the terminal radio device is a receiving unit for receiving the signal and a receiving unit. A demodulator that demodulates the received signal received by, a detector that detects the received electric field strength of the received signal, a discriminator that determines the channel format of the received signal, and a control unit that switches the operation mode of the terminal radio device. The control method of the terminal radio device includes (a) a step in which the detection unit detects the received electric field strength in the first, second, and third sections of the slots assigned to the terminal radio device, and (b) discrimination. The step of discriminating the channel format of the received signal from a plurality of channel formats based on the received electric field strength in the first to third sections of the slot, and (c) the discriminating result of the discriminating section by the control section. The operation mode of the terminal radio device is switched to the normal reception mode or the power saving mode according to the above, and at least the function of the demodulation unit is stopped in the power saving mode, and the plurality of channel formats are the first, second, and so on. Including the third channel format, in the first channel format, the received electric field strength is relatively high in the first, second, and third sections, and in the second channel format, the received electric field strength is in the first section. Is relatively low, the received electric field strength is relatively high in the second and third sections, and in the third channel format, the received electric field strength is relatively low in the first and second sections, and the third is The received electric field strength is relatively high in the section .

In the terminal radio device and the control method of the terminal radio device according to the present invention, the detection unit detects the received electric field strength in the first, second, and third sections in the slot assigned to the terminal radio device of the received signal. .. This makes it possible to discriminate more types of channel formats with higher accuracy than when the received electric field strength is detected only in two sections. Therefore, it is possible to accurately determine the channel format indicating the non-call state and appropriately switch from the normal reception mode to the power saving mode. It is possible to reduce the power consumption of the terminal wireless device by appropriately switching from the normal reception mode to the power saving mode.

It is a figure which shows the structure of the wireless communication system which concerns on Embodiment 1. FIG. It is a schematic diagram of the received signal received by the terminal wireless device which concerns on Embodiment 1. FIG. FIG. 5 is a schematic diagram of a full burst, which is a first channel format of a received signal received by the terminal wireless device according to the first embodiment. It is a schematic diagram of the half burst which is the 2nd channel format of the received signal received by the terminal wireless device which concerns on Embodiment 1. FIG. It is a schematic diagram of the loopback operation synchronous burst which is the 3rd channel format of the received signal received by the terminal wireless device which concerns on Embodiment 1. FIG. It is a block diagram of the terminal wireless device which concerns on Embodiment 1. FIG. It is a flowchart which shows the switching operation of the operation mode of the terminal wireless device which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the switching from the power saving mode to the normal reception mode of the terminal wireless device which concerns on Embodiment 1. FIG. FIG. 5 is a schematic diagram showing switching from a normal reception mode to a power saving mode of the terminal wireless device according to the first embodiment. It is a flowchart which shows the operation of the discriminating part of the terminal wireless device which concerns on Embodiment 1. FIG. It is a block diagram of the terminal wireless device which concerns on Embodiment 2. FIG. It is a schematic diagram explaining the switching of the reception gain of the terminal wireless device which concerns on Embodiment 2. FIG.

<Embodiment 1>
<Composition>
FIG. 1 is a diagram showing a configuration of a wireless communication system according to the first embodiment. As shown in FIG. 1, the wireless communication system includes a central station 10, a plurality of base stations 20, and a plurality of terminal wireless devices 100. The central station 10 includes a communication control device 11 and a central facility 12. Each base station 20 includes a base station control device 21 and a wireless device 22.

The communication control device 11 of the central station 10 is a device for controlling the entire wireless communication system in the area. The base station control device 21 is installed at a wireless relay station or the like. The wireless device 22 is a relay wireless device having a transmission / reception function, and is used to relay wireless communication between the central equipment 12 of the central station 10 and the terminal wireless device 100, and between the terminal wireless devices 100. Will be installed. The base station control device 21 is a device for controlling, monitoring, and the like of the wireless device 22. The central station 10 and the base station 20 and the base station 20 are connected by a link line.

Next, the channel structure of the wireless line in the wireless communication system of the first embodiment will be described. In the wireless communication system, the TDMA method is adopted as the multiplexing method. As shown in FIG. 2, the downlink signal is composed of repetitions of a plurality of consecutive frames. N (for example, 4) slots are defined in each frame, and each slot is assigned to each terminal radio device.

In the downlink between the base station 20 and the terminal wireless device 100, first, second, and third different channel formats are used as the communication channel (Vch) for voice communication depending on the communication state of the base station 20. The first channel format is full burst. The second channel format is a half burst, which has a shorter burst length than a full burst. The third channel format is a loopback operation synchronous burst whose burst length is shorter than that of the half burst.

In the first embodiment, the base station 20 transmits a full burst when a call occurs, and a half burst when there is no call. Also. When the base station 20 is in the return operation state, the return operation synchronous burst is transmitted when there is no call.

Here, the return operation is defined as a terminal radio when communication between the base station 20 and the communication control device 11 of the central station 10 becomes impossible due to a failure or the like, as shown by the broken line arrow in FIG. This is an operation in which the voice communication sent from the uplink from the device 100 to the base station 20 is returned in the device of the base station 20 and relayed to the downlink for the base station.

FIG. 3 is a schematic diagram showing a full burst channel format. FIG. 4 is a schematic diagram showing a half-burst channel format. FIG. 5 is a schematic diagram showing a channel format of the return operation synchronous burst.

As shown in FIG. 3, the full burst channel format includes burst transient response ramp time (R), preamble (P), two individual user channels (USC), synchronization word (SW), identifier (I), and low speed. It is composed of an accompanying control channel (SA) and a guard time (G) for countermeasures against propagation delay time.

As shown in FIG. 4, in the half-burst channel format, about 20% from the beginning of the slot is the guard time (G). The rest of the slots are the burst transient response lamp time (R), preamble (P), communication information channel (RICH) for maintaining downlink synchronization and electric field monitoring, synchronization word (SW), and identifier (I). ), A low-speed accompanying control channel (SA), a user individual channel (USC), and a guard time (G) for countermeasures against propagation delay time.

As shown in FIG. 5, in the channel format of the return operation synchronous burst, all sections other than the burst transient response ramp time (R) and the synchronization word (SW) are configured by the guard time (G).

In the first embodiment, the first, second, and third sections S1, S2, and S3 are defined in the slot of the received signal. As shown in FIG. 4, the first section S1 is defined as a section from the beginning of the slot to the end of the guard time (G). As shown in FIG. 5, the second section S2 is defined as a section from the end of the first section S1 to the end of the guard time (G). As shown in FIGS. 3 to 5, the third section S3 is defined as a section from the end of the second section S2 to the end of the synchronization word (SW). The first to third sections S1, S2, and S3 are common to the first to third channel formats (FIGS. 3 to 5).

As shown in FIGS. 3 to 5, since there is no output in the guard time (G) section of the channel format, the RSSI is lower than that of the other functional channel sections. That is, in the first channel format (that is, full burst), the first, second, and third sections S1, S2, and S3 have relatively high RSSI. Further, in the second channel format (that is, half burst), the first section S1 has a relatively low RSSI, and the second and third sections S2 and S3 have a relatively high RSSI. Further, in the third channel format (that is, the return operation synchronous burst), the RSSIs of the first and second sections S1 and S2 are relatively low, and the RSSI of the third section S3 is relatively high.

FIG. 6 is a block diagram of the terminal wireless device 100 of the first embodiment. As shown in FIG. 6, the terminal wireless device 100 includes a receiving unit 50, a demodulation unit 31, a detection unit 32, a discrimination unit 33, and a control unit 40.

The receiving unit 50 receives the signal transmitted from the base station 20. The receiving unit 50 includes an antenna 51, a radio unit 52, an analog-digital conversion unit 53 (hereinafter, also referred to as an A / D conversion unit 53), and a baseband signal generation unit 54.

The radio unit 52 performs frequency conversion and filtering on the analog RF (radio frequency) signal received from the antenna 51, and outputs an analog IF (intermediate frequency) signal. The A / D conversion unit 53 converts the analog IF signal from the radio unit 52 into a digital IF signal. The baseband signal generation unit 54 digitally downconverts the digital IF signal sent from the A / D conversion unit 53 to generate a baseband I / Q (In-phase, Quadrature-phase) signal.

The demodulation unit 31 decodes the I / Q signal from the baseband signal generation unit 54 and outputs the data. As shown in FIGS. 3 to 5, the detection unit 32 detects RSSI in each of the first to third sections S1, S2, and S3 of the slots assigned to the terminal wireless device 100. The detection of RSSI in the first to third sections S1, S2, and S3 is performed regardless of the normal reception mode or the power saving mode. In the first embodiment, it is assumed that the "slot 2" of FIG. 2 is assigned to the terminal wireless device 100. Hereinafter, the slot assigned to the terminal wireless device 100 will be referred to as an “allocated slot”.

The determination unit 33 determines the channel format of the allocation slot from the first to third channel formats based on the RSSIs of the first to third sections S1, S2, and S3 detected by the detection unit 32. Here, the first to third channel formats are full burst, half burst, and return operation synchronous burst, respectively.

The control unit 40 switches the operation mode of the terminal wireless device 100 to the normal reception mode or the power saving mode according to the determination result of the determination unit 33.

Here, the normal reception mode is a mode in which power is supplied to the reception unit 50 and the demodulation unit 31. The power saving mode is a mode in which the supply of power to a part of the receiving unit 50 and the demodulation unit 31 is stopped. In the power saving mode, power is not supplied to a part of the wireless unit 52 or the A / D conversion unit 53 except for the timing of detecting RSSI, and in the power saving mode, the demodulation unit 31 is used for I and Q signals. Do not decrypt.

The control unit 40 detects the synchronization word (SW) from the demodulated data demodulated by the demodulation unit 31. Further, the control unit 40 plays a role of controlling the entire device such as power control of the wireless unit 52. The control unit 40 in the power saving mode starts the operation when it receives a signal instructing the start of the operation from the determination unit 33. The control unit 40 turns on the signal for activating the demodulation unit 31 immediately after the start of operation and the power ON for supplying power to some components of the wireless unit 52 to which power was not supplied during the power saving mode. Outputs the / OFF control signal, cancels the power saving mode, and shifts to the normal reception mode.

The control unit 40 includes first and second counter units 41 and 42. The first counter unit 41 counts how many times the terminal wireless device 100 has continuously received the half burst and the return operation synchronous burst. The second counter unit 42 counts how many times the synchronization word (SW) cannot be detected by the control unit 40 in succession.

As shown in the shaded areas in FIGS. 4 and 5, in the power saving mode, the detection unit 32 has the first to third sections S1, S2 of the allocated slots (hereinafter, the slots) in one frame. RSSI is detected only in S3.

<Operation mode switching operation>
The operation of switching between the normal reception mode and the power saving mode in the terminal wireless device 100 will be described. FIG. 7 is a flowchart showing an operation mode switching operation. FIG. 8 is a schematic diagram showing switching from the power saving mode to the normal reception mode. FIG. 9 is a schematic diagram showing switching from the normal reception mode to the power saving mode.

First, it is assumed that the terminal wireless device 100 is in the power saving mode (step S101). Next, the control unit 40 determines whether or not the terminal wireless device 100 is within the communication area (step S102). In the following, it is assumed that the terminal wireless device 100 is within the communication area.

The control unit 40 determines whether or not the channel format of the allocation slot received by the terminal wireless device 100 in the power saving mode is full burst (step S103). This determination is performed based on the operation of the discrimination unit 33. The operation of the determination unit 33 will be described later.

When the channel format of the allocation slot received by the terminal wireless device 100 is full burst, the control unit 40 switches the operation mode of the terminal wireless device 100 from the power saving mode to the normal receiving mode (step S104). More specifically, as shown in FIG. 8, the channel format of the allocated slot of frame 1 (slot 2 shaded in FIG. 8) is a loopback synchronous burst, and the channel format of slot 2 of the next frame 2 is full. In the case of a burst, the control unit 40 immediately switches the operation mode from the power saving mode to the normal reception mode. That is, the control unit 40 transmits a signal for activating the demodulation unit 31 to the demodulation unit 31 and supplies power to some components of the radio unit 52 to which power was not supplied during the power saving mode. Power ON / OFF control signal for The activated demodulation unit 31 starts decoding the received signal from the user individual channel (USC) (see FIG. 3) in the latter half of the slot 2 of the full burst of the frame 2.

Next, the operation of switching from the normal reception mode to the power saving mode will be described. First, it is assumed that the terminal wireless device 100 is in the normal reception mode (step S104). Next, the control unit 40 detects a signal indicating the end of the call (step S105).

After detecting the signal indicating the end of the call, the control unit 40 determines whether or not the format of the received signal is a half burst or a return operation synchronous burst over a plurality of frames (step S106). Here, the number of the plurality of frames is a predetermined number. Further, the frame is counted by the first counter unit 41.

When the format of the received signal is half burst or return operation synchronous burst over a plurality of frames, the control unit 40 switches the operation mode of the terminal wireless device 100 from the normal reception mode to the power saving mode (step S107). More specifically, as shown in FIG. 9, the channel format of the allocated slot of frame 1 (slot 2 shaded in FIG. 9) is full burst, and the channel format of slot 2 of the next frame 2 is half burst. Alternatively, in the case of a return operation synchronous burst, the second counter unit 42 starts counting, and when the channel format is a half burst or a return operation synchronous burst continuously up to the frame N + 1, the control unit 40 in the frame N + 1. Switch the operation mode from the normal reception mode to the power saving mode. That is, the control unit 40 transmits a signal for stopping the demodulation unit 31 to the demodulation unit 31, and transmits a power ON / OFF control signal for supplying power to some components of the radio unit 52. To do.

In the above, it is assumed that the terminal wireless device 100 is within the call area, but in the following, it is assumed that the terminal wireless device 100 is not within the call area.

The control unit 40 captures the control channel (Cch) over a plurality of frames at a fixed cycle, and determines whether or not the control channel has been captured (step S108). When the control channel (Cch) is captured, the control unit 40 switches the operation mode from the power saving mode to the normal reception mode (step S109). Even when the user of the terminal wireless device 100 performs a key operation on the terminal wireless device 100, the control unit 40 switches the operation mode from the power saving mode to the normal reception mode.

When the terminal wireless device 100 is not within the communication area, the control unit of the terminal wireless device 100 in the normal reception mode determines whether or not the synchronization word (SW) has been detected (step S110). When the control unit 40 detects the synchronization word (SW), the process proceeds to step S105. When the control unit 40 cannot detect the synchronization word (SW), the control unit 40 determines whether or not the synchronization word (SW) cannot be continuously detected over a plurality of frames (step S111). .. Here, the number of the plurality of frames is a predetermined number. Further, the frame is counted by the second counter unit 42. When the synchronization word cannot be continuously detected over a plurality of frames, the control unit switches the operation mode from the normal reception mode to the power saving mode.

In order for the terminal wireless device 100 to switch to the power saving mode, it is a prerequisite that the user does not perform the key operation for the time set by the terminal wireless device 100.

<Operation of discriminator>
The operation of the discriminating unit 33 of the terminal wireless device 100 will be described. FIG. 10 is a flowchart showing the operation of the discrimination unit 33. Hereinafter, the RSSIs of the first, second, and third sections S1, S2, and S3 are defined as V1, V2, and V3, respectively. Further, a predetermined threshold value is defined as D.

First, the determination unit 33 compares the difference (| V2-V1 |) between the RSSI (V1) of the first section S1 of the allocation slot and the RSSI (V2) of the second section S2 with the threshold value D (step S201). ). The determination unit 33 determines whether or not | V2-V1 | is equal to or greater than the threshold value D (step S202). Then, when | V2-V1 | is equal to or higher than the threshold value D, the discrimination unit 33 determines that the channel format of the slot to be discriminated is half burst (step S203). On the other hand, when | V2-V1 | is not equal to or more than the threshold value D, the determination unit 33 determines that the channel format of the allocation slot is not half burst, and proceeds to step S204.

In the half-burst channel format, the first section S1 is occupied by the guard time (G) and the second section S2 is occupied by the communication system information channel (RICH). Therefore, in the first and second sections S1 and S2. The RSSI level difference becomes large. On the other hand, in the full burst channel format, since the user individual channels (USC) occupy both the first and second sections S1 and S2, the RSSI level difference is small. Further, in the channel format of the return operation synchronous burst, since the guard time (G) occupies both the first and second sections S1 and S2, the difference in RSSI level is small. Therefore, it is possible to determine whether or not the channel format is half burst by comparing the RSSI level differences of the first and second sections S1 and S2 of the allocation slots.

In step S204, the discriminating unit 33 compares the difference (| V3-V2 |) between the RSSI (V2) of the second section S2 of the allocation slot and the RSSI (V3) of the third section S3 with the threshold value D. The determination unit 33 determines whether or not | V3-V2 | is equal to or greater than the threshold value D (step S205). Then, when | V3-V2 | is equal to or higher than the threshold value D, the determination unit 33 determines that the channel format of the allocation slot is the return operation synchronization burst (step S206).

On the other hand, when | V3-V2 | is not equal to or higher than the threshold value D, the determination unit 33 determines that the channel format of the slot to be determined is full burst (step S207).

In the full burst channel format, since the second section S2 is occupied by the user individual channel (USC) and the third section S3 is occupied by the synchronization word (SW), RSSI in the second and third sections S2 and S3. Level difference becomes smaller. On the other hand, in the channel format of the return operation synchronous burst, the guard time (G) occupies the second section S2 and the synchronization word (SW) occupies the third section S3, so that the RSSI level difference becomes large. Therefore, it is possible to determine whether the channel format is a full burst or a return operation synchronous burst by comparing the RSSI level differences of the second and third sections S2 and S3 of the allocation slots.

<Effect>
The terminal wireless device 100 according to the first embodiment is a terminal wireless device that receives a signal multiplexed by a time-division multiple connection method, and is a receiving unit 50 that receives the signal and a receiving signal received by the receiving unit 50. The detection unit 32 that detects the reception electric field strength (RSSI) of the first, second, and third sections S1, S2, and S3 in the demodulation unit 31 that demodulates the signal and the slot assigned to the terminal wireless device 100 of the reception signal. Based on the received electric field strengths of the first to third sections S1, S2, and S3 of the slot, the discriminating unit 33 that discriminates the channel format of the slot from among the plurality of channel formats and the discriminating result of the discriminating unit 33. Correspondingly, the control unit 40 for switching the operation mode of the terminal wireless device 100 to the normal reception mode or the power saving mode is provided, and at least the function of the demodulation unit 31 is stopped in the power saving mode.

In the first embodiment, the detection unit 32 detects the RSSIs of the first, second, and third sections S1, S2, and S3 in the slots assigned to the terminal wireless device 100 of the received signal. This makes it possible to discriminate more types of channel formats with higher accuracy than when RSSI is detected only in two sections. Therefore, it is possible to accurately determine the channel format indicating the non-call state and appropriately switch from the normal reception mode to the power saving mode. It is possible to reduce the power consumption of the terminal wireless device 100 by appropriately switching from the normal reception mode to the power saving mode.

Further, in the terminal radio device 100 according to the first embodiment, the plurality of channel formats include the first, second, and third channel formats, and in the first channel format, the first, second, and third sections. The received electric field strength of S1, S1 and S2 is relatively high, and in the second channel format, the received electric field strength of the first section S1 is relatively low, and the received electric field strength of the second and third sections S2 and S3 is high. The intensity is relatively high, and in the third channel format, the received electric field strength is relatively low in the first and second sections S1 and S2, and the received electric field strength is relatively high in the third sections S2 and S3. ..

Therefore, by defining the first, second, and third sections S1, S2, and S3 as described above, the first, second, and third sections S1, S2, and S3 are based on the RSSI of the first, second, and third sections. It is possible to determine the second and third channel formats.

Further, in the terminal wireless device 100 according to the first embodiment, the first channel format is a full burst, the second channel format is a half burst having a shorter burst length than the full burst, and the third channel. The format is a return operation synchronous burst having a burst length shorter than that of the half burst, and the return operation synchronous burst is a channel format used in the return operation state in which the base station 20 performs the return communication to the terminal wireless device 100. ..

In addition to the full burst and half burst that can be discriminated by the conventional terminal wireless device, the terminal wireless device 100 of the first embodiment can discriminate the return operation synchronous burst. As a result, the power saving mode can be applied to the terminal wireless device 100 even during the return operation, and the power consumption can be reduced.

Further, in the terminal radio device 100 according to the first embodiment, the discriminating unit 33 compares the difference in the received electric field strength between the first and second sections S1 and S2 with the predetermined threshold value to obtain the received signal. It is determined whether or not the channel format is the second channel format (that is, half burst), and the determination unit 33 determines the difference between the received electric field strengths in the second and third sections S2 and S3 and a predetermined threshold value. Is compared to determine whether or not the channel format of the received signal is the third channel format (that is, the loopback operation synchronous burst).

Therefore, it is determined whether or not the channel format is the second channel format (that is, half burst) based on the RSSI of the first and second sections S1 and S2, and then the second and third sections S2 and S2. It is possible to determine the first to third channel formats by determining whether or not the channel format is the third channel format (that is, the return operation synchronous burst) based on the RSSI of S3.

Further, in the terminal wireless device 100 according to the first embodiment, when the terminal wireless device 100 is in the power saving mode and the discrimination unit 33 determines that the format of the received signal is full burst, the control unit 40 operates. Switch the mode from power saving mode to normal reception mode. Therefore, the terminal radio device 100 can start modulation of the signal received from the base station 20.

Further, in the terminal wireless device 100 according to the first embodiment, when the discriminating unit 33 determines that the format of the received signal is full burst, the control unit 40 is in the process of receiving the slot determined to be full burst. The operation mode is switched from the power saving mode to the normal reception mode, and the demodulation unit 31 starts demodulation of the received signal from the middle of receiving the slot.

Therefore, since the terminal wireless device 100 of the first embodiment starts demodulation in the middle of receiving the slot determined to be full burst, it communicates faster than the case where demodulation is started from the slot of the next frame. Can be started.

Further, in the terminal wireless device 100 according to the first embodiment, when the determination unit 33 continuously determines that the format of the received signal is half burst over a plurality of frames after detecting the signal indicating the end of the call. After switching the operation mode from the normal reception mode to the power saving mode and detecting the signal indicating the end of the call, the control unit 40 causes the determination unit 33 to format the received signal over a plurality of frames, and the format of the received signal is a return operation synchronous burst. When it is continuously determined, the control unit 40 switches the operation mode from the normal reception mode to the power saving mode.

Therefore, after detecting the signal indicating the end of the call, the normal reception mode is switched to the power saving mode when the format of the received signal is continuously determined to be a half burst or a return operation synchronous burst over a plurality of frames. Therefore, it is possible to prevent accidentally switching to the power saving mode during communication.

Further, in the terminal wireless device 100 according to the first embodiment, the control unit 40 detects a synchronization word (SW) from the received signal, and when the terminal wireless device 100 is in the normal reception mode, the control unit 40 has a plurality of control units 40. When the synchronization word (SW) cannot be continuously detected over the frame, the control unit 40 switches the operation mode from the normal reception mode to the power saving mode. Therefore, it is possible to switch to the power saving mode when the terminal wireless device 100 is not within the communication area.

The control method of the terminal wireless device 100 in the first embodiment is a control method of the terminal wireless device that receives the signal multiplexed by the time division multiplex method, and the terminal wireless device 100 is a receiving unit that receives the signal. 50, a demodulator 31 that demolishes the received signal received by the receiver 50, a detector 32 that detects the received electric field strength (RSSI) of the received signal, a discriminator 33 that discriminates the channel format of the received signal, and a terminal. A control unit 40 for switching the operation mode of the wireless device 100 is provided, and the control method of the terminal wireless device 100 is as follows: (a) The detection unit 32 has the first, second, and first slots assigned to the terminal wireless device 100. A plurality of steps of detecting the received electric field strength of the sections S1, S2, S3 of 3 and (b) the discriminating unit 33 based on the received electric field strength of the first to third sections S1, S2, S3 of the slot. The step of determining the channel format of the received signal from the channel formats, and (c) the control unit 40 sets the operation mode of the terminal wireless device 100 to the normal reception mode or the power saving mode according to the determination result of the determination unit 33. A step of switching is provided, and at least the function of the demodulator 31 is stopped in the power saving operation mode.

Further, in the control method of the terminal radio device 100 according to the first embodiment, in the step (b), the determination unit 33 (b1) predetermines the difference in the received electric field strength between the first and second sections S1 and S2. The step of comparing the obtained threshold value and the (b2) determination unit 33 determine whether or not the channel format is the second channel format (that is, half burst) based on the comparison result in the step (b1). When it is determined in the step and the step (b3) step (b2) that the channel format is not the second channel format, the discriminating unit 33 predetermines the difference in the received electric field strength between the second and third sections S2 and S3. Based on the step of comparing the determined threshold and the comparison result in the step (b4), the determination unit 33 determines whether or not the channel format is the third channel format (that is, the loopback operation synchronous burst). It includes a step of discriminating.

Therefore, it is determined whether or not the channel format is the second channel format (that is, half burst) based on the RSSI of the first and second sections S1 and S2, and then the second and third sections S2 and S2. It is possible to determine the first to third channel formats by determining whether or not the channel format is the third channel format (that is, the return operation synchronous burst) based on the RSSI of S3.

Further, in the control method of the terminal wireless device 100 in the first embodiment, in the step (c1), when the terminal wireless device 100 is in the power saving mode, the discriminating unit 33 performs a full burst of the channel format of the received signal. When it is determined, the control unit 40 includes a step of switching the operation mode from the power saving mode to the normal reception mode. Therefore, the terminal radio device 100 can start modulation of the signal received from the base station 20.

Further, in the step (c1) of the control method of the terminal wireless device 100 in the first embodiment, the control unit 40 omits the operation mode during the reception of the slot in which the channel format of the received signal is determined to be full burst. A step of switching from the power mode to the normal reception mode and the demodulation unit 31 starting demodulation of the received signal from the middle of receiving the slot in the step (d) step (c1) is further provided.

Therefore, in the control method of the terminal wireless device 100 of the first embodiment, since the demodulation is started from the middle of receiving the slot determined to be full burst, the demodulation is started from the slot of the next frame as compared with the case where the demodulation is started from the slot of the next frame. , It becomes possible to start communication earlier.

Further, in the control method of the terminal wireless device 100 in the first embodiment, in the step (c), after detecting the signal indicating the end of the call (c2), the discriminating unit 33 formats the received signal over a plurality of slots. When is continuously determined to be a half burst, after the control unit 40 detects the step of switching the operation mode from the normal reception mode to the power saving mode and (c3) a signal indicating the end of the call, the determination unit 33 determines. When it is continuously determined that the format of the received signal is a loopback operation synchronous burst over a plurality of slots, the control unit 40 further includes a step of switching the operation mode from the normal reception mode to the power saving mode.

Therefore, after detecting the signal indicating the end of the call, the normal reception mode is switched to the power saving mode when the format of the received signal is continuously determined to be a half burst or a return operation synchronous burst over a plurality of frames. Therefore, it is possible to prevent accidentally switching to the power saving mode during communication.

Further, in the control method of the terminal wireless device 100 in the first embodiment, the control unit 40 detects the synchronization word (SW) from the received signal, and in the step (c), the terminal wireless device 100 is in the normal reception mode. When the control unit 40 cannot continuously detect the synchronization word (SW) over a plurality of slots, the control unit 40 switches the operation mode from the normal reception mode to the power saving mode. Be prepared. Therefore, it is possible to switch to the power saving mode when the terminal wireless device 100 is not within the communication area.

<Embodiment 2>
<Composition>
FIG. 11 is a block diagram of the terminal wireless device 200 in the second embodiment. As shown in FIG. 11, the terminal wireless device 200 according to the second embodiment further includes a reception gain setting unit 34 with respect to the terminal wireless device 100 (FIG. 6). The reception gain setting unit 34 sets the reception gain of the reception unit 50 based on the RSSI of the third section S3 of the slot assigned to the terminal radio device 200. The control unit 40 switches the reception gain of the reception unit 50 based on the reception gain set by the reception gain setting unit 34. The reception gain of the reception unit 50 is switched by switching the reception gain of the reception gain switching circuit 521 of the radio unit 52. Since the configurations other than the reception gain setting unit 34 and the reception gain switching circuit 521 are the same as those in the first embodiment (FIG. 6), the description thereof will be omitted.

<Operation>
As described with reference to FIGS. 3 to 5, the RSSI is at the same level in the third section S3, which is common to the full burst, the half burst, and the return synchronous burst. By utilizing this, even when the terminal wireless device 200 is in the power saving mode, it is possible to set the reception gain based on the RSSI of the third section S3 of the half burst or the return synchronous burst.

The reception gain setting unit 34 calculates the current optimum reception gain setting based on the RSSI of the third section S3 of the allocation slot, and notifies the control unit 40 of the setting. The control unit 40 transmits a reception gain control signal to the reception gain switching circuit 521 to immediately reflect the notified reception gain setting. As a result, the terminal wireless device 200 can always receive the signal transmitted from the base station 20 with the optimum reception gain even in the power saving mode.

FIG. 12 is a schematic diagram illustrating switching of the reception gain of the terminal wireless device 200. It is assumed that the terminal wireless device 200 can switch the reception gain in three stages (large, medium, and small), for example. As shown in FIG. 12, the dynamic range R1 is a range of RSSI that can be detected when the reception gain is set to “large”. The dynamic range R2 is the range of RSSI that can be detected when the reception gain is set to “medium”. The dynamic range R3 is a range of RSSI that can be detected when the reception gain is set to “small”.

As shown in FIG. 12, the reception gain setting unit 34 compares the RSSI of the third section S3 of the allocation slot with the threshold values W, X, Y, and Z, and sets the reception gain to any one of large, medium, and small. Set to. When the RSSI of the third section S3 of the slot is below the threshold value W, the reception gain setting unit 34 sets the reception gain to “large”. When the reception gain is set to "Large" and the RSSI of the third section S3 exceeds the threshold value X, the reception gain setting unit 34 changes the reception gain from "Large" to "Medium".

Further, when the RSSI of the third section S3 of the allocation slot exceeds the threshold value Z, the reception gain setting unit 34 sets the reception gain to “small”. When the reception gain is set to "small" and the RSSI of the third section S3 falls below the threshold value Y, the reception gain setting unit 34 changes the reception gain from "small" to "medium".

In this way, the reception gain setting unit 34 sets the reception gain of the reception unit 50 to be smaller when the RSSI of the third section S3 of the allocation slot is larger, and when the RSSI of the third section S3 is smaller, The reception gain of the receiving unit 50 is set to be larger.

For example, it is assumed that the current reception gain is set to "small" in the terminal wireless device 200 in the power saving mode. When the RSSI of the third section S3 of the allocation slot decreases and falls below the threshold value Y as the distance between the terminal radio device 200 and the base station 20 increases, the reception gain setting unit 34 sets the reception gain to “small”. Change from to "medium".

At the same time, if the determination unit 33 determines that the channel format of the allocated slot is full burst, the control unit 40 immediately switches the operation mode from the power saving mode to the normal reception mode, and the reception signal is received from the latter half of this slot. Start demodulation of.

On the other hand, when the determination unit 33 determines that the channel format of the allocated slot is a half burst or a return operation synchronous burst, the terminal wireless device 200 continues the power saving mode. Then, in the slot of the next reception frame, in the state of the reception gain "medium", the channel format determination operation and the reception gain setting operation of the allocation slot are similarly executed.

<Effect>
The terminal radio device 200 according to the second embodiment further includes a reception gain setting unit 34 that sets the reception gain of the reception unit 50 based on the reception electric field strength (RSSI) of the third section S3 of the slot, and is a control unit. The reception gain setting unit 34 switches the reception gain of the reception unit 50 based on the reception gain set by the reception gain setting unit 34, and the reception gain setting unit 34 of the reception unit 50 when the electric field strength of the third section S3 is larger. When the reception gain is set smaller and the electric field strength in the third section S3 is smaller, the reception gain of the receiving unit 50 is set larger.

According to the terminal wireless device 200 according to the second embodiment, the reception gain can be optimally set even in the power saving mode, so that the reception gain is appropriately set when the power saving mode is switched to the normal reception mode. It is possible to suppress the trouble of demodulation caused by not doing so. As described in the first embodiment, the terminal wireless devices 100 and 200 switch from the power saving mode to the normal receiving mode and start demodulation of the received signal during the reception of the slot determined to be full burst. Therefore, the second embodiment in which the reception gain can be set in the power saving mode before switching to the normal reception mode is particularly effective, and the communication quality at the start of a call can be improved.

Further, when the RSSI of the third section S3 of the slot is larger, the reception gain is set to be smaller, and when the RSSI of the third section S3 is smaller, the reception gain is set to be larger to obtain the base station 20. Even when the RSSI changes due to a change in the distance of the terminal wireless device 200, the reception gain can be optimally maintained.

Further, in the control method of the terminal wireless device 200 according to the second embodiment, the terminal wireless device 200 further includes a reception gain setting unit 34 for setting the reception gain of the reception unit 50, and the control method of the terminal wireless device 200 is described. (E) A step in which the reception gain setting unit 34 sets the reception gain of the reception unit 50 based on the reception electric field strength (RSSI) of the third section S3 of the slot, and (f) the control unit 40 sets the reception gain. Further including a step of switching the reception gain of the reception unit 50 based on the reception gain set by the setting unit 34, in the step (e), the reception gain setting unit 34 has a higher electric field strength in the third section S3. When it is large, the reception gain of the receiving unit 50 is set smaller, and when the electric field strength of the third section S3 is smaller, the receiving gain of the receiving unit 50 is set larger.

According to the terminal wireless device 200 according to the second embodiment, the reception gain can be optimally set even in the power saving mode, so that the reception gain is appropriately set when the power saving mode is switched to the normal reception mode. It is possible to suppress the trouble of demodulation caused by not doing so. Further, when the RSSI of the third section S3 of the slot is larger, the reception gain is set smaller, and when the RSSI of the third section S3 is smaller, the reception gain is set larger. Even when the RSSI changes due to a change in the distance between the 20 and the terminal wireless device 200, the reception gain can be optimally maintained.

In the present invention, each embodiment can be freely combined, and each embodiment can be appropriately modified or omitted within the scope of the invention.

10 Central station, 11 Communication control device, 12 Central equipment, 20 Base station, 21 Base station control device, 22 Radio device, 31 Demodulation unit, 32 Detection unit, 33 Discrimination unit, 34 Reception gain setting unit, 40 Control unit, 41 1st counter unit, 42 2nd counter unit, 50 receiving unit, 51 antenna, 52 radio unit, 521 reception gain switching circuit, 53 A / D conversion unit, 54 base band signal generator, 100, 200 terminal radio equipment ..

Claims (20)

A terminal wireless device that receives signals multiplexed by the time division multiple access method.
A receiver that receives the signal and
A demodulation unit that demodulates the received signal received by the reception unit, and
In the slot assigned to the terminal wireless device of the received signal, a detection unit that detects the received electric field strength in the first, second, and third sections, and
A discriminating unit that determines the channel format of the slot from among a plurality of channel formats based on the received electric field strength in the first to third sections of the slot.
A control unit that switches the operation mode of the terminal wireless device to a normal reception mode or a power saving mode according to the discrimination result of the discrimination unit.
With
At least the function of the demodulation unit is stopped in the power saving mode ,
The plurality of channel formats include first, second, and third channel formats.
In the first channel format, the received electric field strength is relatively high in the first, second, and third sections.
In the second channel format, the first section has a relatively low received electric field strength, and the second and third sections have a relatively high received electric field strength.
In the third channel format, the first and second sections have relatively low received electric field strength, and the third section has relatively high received electric field strength.
Terminal wireless device. The discriminating unit compares the difference in the received electric field strength in the first and second sections with a predetermined threshold value, and determines whether or not the channel format of the received signal is the second channel format. Determine and
The discriminating unit compares the difference in the received electric field strength in the second and third sections with a predetermined threshold value, and determines whether or not the channel format of the received signal is the third channel format. To determine,
The terminal wireless device according to claim 1 . The first channel format is full burst and
The second channel format is a half burst having a shorter burst length than the full burst.
The third channel format is a loopback operation synchronous burst having a burst length shorter than that of the half burst.
The loopback operation synchronous burst is a channel format used in the loopback operation state in which the base station performs loopback communication with the terminal wireless device.
The terminal wireless device according to claim 1 or 2. When the terminal radio device is in the power saving mode and the discriminating unit determines that the channel format of the received signal is the full burst, the control unit changes the operation mode from the power saving mode to the normal. Switch to receive mode,
The terminal wireless device according to claim 3 . When the discriminating unit determines that the channel format of the received signal is the full burst, the control unit sets the operation mode to the power saving mode during reception of the slot determined to be the full burst. To switch to the normal reception mode, the demodulation unit starts demodulation of the received signal from the middle of reception of the slot.
The terminal wireless device according to claim 4 . After detecting the signal indicating the end of the call, when the discriminating unit continuously determines that the channel format of the received signal is the half burst over a plurality of frames, the control unit starts from the normal receiving mode. Switch to the power saving mode,
When the discriminating unit continuously determines that the channel format of the received signal is the loopback operation synchronous burst after detecting the signal indicating the end of the call, the control unit continuously receives the normal reception. Switch from the mode to the power saving mode,
The terminal wireless device according to any one of claims 3 to 5 . The control unit detects a synchronization word from the received signal and
When the terminal radio device is in the normal reception mode and the control unit cannot continuously detect the synchronization word over a plurality of frames, the control unit performs the power saving from the normal reception mode. Switch to mode,
The terminal wireless device according to any one of claims 1 to 6 . A reception gain setting unit for setting the reception gain of the reception unit based on the reception electric field strength of the third section of the slot is further provided.
The control unit switches the reception gain of the reception unit based on the reception gain set by the reception gain setting unit.
The reception gain setting unit sets the reception gain of the reception unit to be smaller when the electric field strength of the third section is larger, and receives the reception unit of the reception unit when the electric field strength of the third section is smaller. Set the gain higher,
The terminal wireless device according to any one of claims 1 to 7 . A terminal wireless device that receives signals multiplexed by the time division multiple access method.
A receiver that receives the signal and
A demodulation unit that demodulates the received signal received by the reception unit, and
A detection unit that detects the received electric field strength in the first, second, and third sections in the slot assigned to the terminal wireless device of the received signal.
A discriminating unit that discriminates the channel format of the slot from among a plurality of channel formats based on the received electric field strength in the first to third sections of the slot.
A control unit that switches the operation mode of the terminal wireless device to a normal reception mode or a power saving mode according to the discrimination result of the discrimination unit.
With
At least the function of the demodulation unit is stopped in the power saving mode,
The control unit detects a synchronization word from the received signal and
When the terminal radio device is in the normal reception mode and the control unit cannot continuously detect the synchronization word over a plurality of frames, the control unit performs the power saving from the normal reception mode. Switch to mode,
End end of the wireless device. A terminal wireless device that receives signals multiplexed by the time division multiple access method.
A receiver that receives the signal and
A demodulation unit that demodulates the received signal received by the reception unit, and
A detection unit that detects the received electric field strength in the first, second, and third sections in the slot assigned to the terminal wireless device of the received signal.
A discriminating unit that discriminates the channel format of the slot from among a plurality of channel formats based on the received electric field strength in the first to third sections of the slot.
A control unit that switches the operation mode of the terminal wireless device to a normal reception mode or a power saving mode according to the discrimination result of the discrimination unit.
A reception gain setting unit that sets the reception gain of the reception unit based on the reception electric field strength of the third section of the slot .
With
At least the function of the demodulation unit is stopped in the power saving mode,
The control unit switches the reception gain of the reception unit based on the reception gain set by the reception gain setting unit.
The reception gain setting unit sets the reception gain of the reception unit to be smaller when the electric field strength of the third section is larger, and receives the reception unit of the reception unit when the electric field strength of the third section is smaller. Set the gain higher,
End end of the wireless device. It is a control method of a terminal wireless device that receives a signal multiplexed by a time division multiple access method.
The terminal wireless device is
A receiver that receives the signal and
A demodulation unit that demodulates the received signal received by the reception unit, and
A detector that detects the received electric field strength of the received signal,
A discriminating unit that discriminates the channel format of the received signal and
A control unit that switches the operation mode of the terminal wireless device, and
With
The control method of the terminal wireless device is
(A) A step in which the detection unit detects the received electric field strength in the first, second, and third sections of the slot assigned to the terminal wireless device.
(B) A step in which the discriminating unit discriminates the channel format of the received signal from a plurality of channel formats based on the received electric field strength in the first to third sections of the slot.
(C) A step in which the control unit switches the operation mode of the terminal wireless device to a normal reception mode or a power saving mode according to the discrimination result of the discrimination unit.
With
At least the function of the demodulation unit is stopped in the power saving mode ,
The plurality of channel formats include first, second, and third channel formats.
In the first channel format, the received electric field strength is relatively high in the first, second, and third sections.
In the second channel format, the first section has a relatively low received electric field strength, and the second and third sections have a relatively high received electric field strength.
In the third channel format, the first and second sections have relatively low received electric field strength, and the third section has relatively high received electric field strength.
How to control the terminal wireless device. The step (b) is
(B1) A step in which the discriminating unit compares the difference in received electric field strength between the first and second sections with a predetermined threshold value.
(B2) A step in which the discriminating unit determines whether or not the channel format is the second channel format based on the comparison result in the step (b1).
(B3) When it is determined in the step (b2) that the channel format is not the second channel format, the determination unit is predetermined as the difference in the received electric field strength in the second and third sections. The process of comparing with the threshold and
(B4) A step in which the discriminating unit determines whether or not the channel format is the third channel format based on the comparison result in the step (b3).
To prepare
The method for controlling a terminal wireless device according to claim 11 . The first channel format is full burst and
The second channel format is a half burst having a shorter burst length than the full burst.
The third channel format is a loopback operation synchronous burst having a burst length shorter than that of the half burst.
The return operation synchronous burst is a channel format used in the return operation state in which the base station performs return communication.
The method for controlling a terminal wireless device according to claim 11 or 12 . The step (c) is
(C1) When the terminal wireless device is in the power saving mode and the discriminating unit determines that the channel format of the received signal is the full burst, the control unit sets the operation mode to the power saving mode. The step of switching to the normal reception mode is provided.
The method for controlling a terminal wireless device according to claim 13 . In the step (c1), the control unit switches the operation mode from the power saving mode to the normal receiving mode during reception of the slot for which the channel format of the received signal is determined to be the full burst.
(D) The demodulation unit further includes a step of starting demodulation of the received signal from the middle of receiving the slot in the step (c1).
The control method for a terminal wireless device according to claim 14. The step (c) is
(C2) When the discriminating unit continuously determines that the format of the received signal is the half burst over a plurality of slots after detecting the signal indicating the end of the call, the control unit performs the operation mode. In the process of switching from the normal reception mode to the power saving mode,
(C3) When the discriminating unit continuously determines that the format of the received signal is the loopback operation synchronous burst over a plurality of slots after detecting the signal indicating the end of the call, the control unit performs the above. The process of switching the operation mode from the normal reception mode to the power saving mode, and
Further prepare
The method for controlling a terminal wireless device according to any one of claims 13 to 15. The control unit detects a synchronization word from the received signal and
The step (c) is
When the terminal radio device is in the normal reception mode and the control unit cannot continuously detect synchronization words across a plurality of slots, the control unit sets the operation mode to the normal reception mode. The step of switching the operation mode to the power saving mode is provided.
The method for controlling a terminal wireless device according to any one of claims 11 to 16. The terminal wireless device further includes a reception gain setting unit for setting the reception gain of the reception unit.
The control method of the terminal wireless device is
(E) A step in which the reception gain setting unit sets the reception gain of the reception unit based on the reception electric field strength of the third section of the slot.
(F) A step in which the control unit switches the reception gain of the reception unit based on the reception gain set by the reception gain setting unit.
With more
In the step (e), when the electric field strength in the third section is larger, the reception gain setting unit sets the reception gain of the receiving unit to be smaller, and when the electric field strength in the third section is smaller. , Set the reception gain of the receiver to be larger,
The method for controlling a terminal wireless device according to any one of claims 11 to 17. It is a control method of a terminal wireless device that receives a signal multiplexed by a time division multiple access method.
The terminal wireless device is
A receiver that receives the signal and
A demodulation unit that demodulates the received signal received by the reception unit, and
A detector that detects the received electric field strength of the received signal,
A discriminating unit that discriminates the channel format of the received signal and
A control unit that switches the operation mode of the terminal wireless device, and
With
The control method of the terminal wireless device is
(A) A step in which the detection unit detects the received electric field strength in the first, second, and third sections of the slot assigned to the terminal wireless device.
(B) A step in which the discriminating unit discriminates the channel format of the received signal from a plurality of channel formats based on the received electric field strength in the first to third sections of the slot.
(C) A step in which the control unit switches the operation mode of the terminal wireless device to a normal reception mode or a power saving mode according to the discrimination result of the discrimination unit.
With
At least the function of the demodulation unit is stopped in the power saving mode,
The control unit detects a synchronization word from the received signal and
The step (c) is
When the terminal radio device is in the normal reception mode and the control unit cannot continuously detect synchronization words across a plurality of slots, the control unit sets the operation mode to the normal reception mode. The step of switching the operation mode to the power saving mode is provided.
The method of the end end of the wireless device. It is a control method of a terminal wireless device that receives a signal multiplexed by a time division multiple access method.
The terminal wireless device is
A receiver that receives the signal and
A demodulation unit that demodulates the received signal received by the reception unit, and
A detector that detects the received electric field strength of the received signal,
A discriminating unit that discriminates the channel format of the received signal and
A control unit that switches the operation mode of the terminal wireless device, and
A reception gain setting unit that sets the reception gain of the reception unit ,
With
The control method of the terminal wireless device is
(A) A step in which the detection unit detects the received electric field strength in the first, second, and third sections of the slot assigned to the terminal wireless device.
(B) A step in which the discriminating unit discriminates the channel format of the received signal from a plurality of channel formats based on the received electric field strength in the first to third sections of the slot.
(C) A step in which the control unit switches the operation mode of the terminal wireless device to a normal reception mode or a power saving mode according to the discrimination result of the discrimination unit.
With
At least the function of the demodulation unit is stopped in the power saving mode,
The control method of the terminal wireless device is
(E) A step in which the reception gain setting unit sets the reception gain of the reception unit based on the reception electric field strength of the third section of the slot.
(F) A step in which the control unit switches the reception gain of the reception unit based on the reception gain set by the reception gain setting unit.
With more
In the step (e), when the electric field strength of the third section is larger, the reception gain setting unit sets the reception gain of the receiving unit to be smaller, and when the electric field strength of the third section is smaller. , Set the reception gain of the receiver to be larger,
The method of the end end of the wireless device.

Images