JP7372376B2 - Communication systems, terminal wireless equipment - Google Patents

Description

The technology disclosed in this specification relates to a technology in a communication system that performs communication.

A time division multiple access (TDMA) type digital wireless communication system includes a headquarters device, a base station device, a terminal wireless device, and the like. The TDMA digital wireless communication system is mainly connected to an existing communication network or between terminal wireless devices by having a mobile individual have a terminal wireless device or by installing a terminal wireless device in a moving vehicle. This is a wireless communication system that performs voice communication.

In the TDMA method adopted in the digital wireless communication system, a control channel (hereinafter sometimes referred to as control CH) is generally used to transmit broadcast information, which is information necessary for system operation, to a terminal wireless device. Techniques for notifying are known.

The broadcast information is a signal that is cyclically transmitted from the headquarters device using a plurality of radio frames, that is, periodically. The terminal wireless device receives the above broadcast information into its own station via the wireless line. Then, the terminal wireless device operates after the captured broadcast information reaches one cycle.

In order to receive broadcast information, the terminal wireless device needs to constantly receive the above-mentioned control channel in addition to the call channel (hereinafter sometimes referred to as call CH), as exemplified in Patent Document 1, for example. .

In addition, in order to avoid terminal radio equipment from constantly receiving broadcast information, for example, as exemplified in Patent Document 2, a warning channel (hereinafter referred to as In some cases, a method of transmitting a warning CH (sometimes referred to as a warning CH) was adopted.

Japanese Patent Application Publication No. 2000-115068 Japanese Patent Application Publication No. 11-317978

Since the conventional TDMA digital wireless communication system is configured as described above, for example, in the case illustrated in Patent Document 1, the terminal wireless device needs to continuously receive control channels in addition to the communication channel. There is. Therefore, there was a problem in that the power consumption of the terminal wireless device increased and the battery life was shortened.

Further, for example, in the case illustrated in Patent Document 2, one slot in a radio frame is occupied by a warning channel, which causes a problem that the usage efficiency of the communication channel deteriorates. Further, for example, in the case illustrated in Patent Document 2, the terminal wireless device needs to separately receive a warning channel, which complicates the control operation in the terminal wireless device. Therefore, there was a problem in that the power consumption of the terminal wireless device increased and the battery life was shortened.

The technology disclosed in this specification has been made to solve the problems described above, and is a wireless communication technology that can receive broadcast information while suppressing power consumption in a terminal wireless device. It is related to.

A first aspect of the technology disclosed in this specification includes a headquarters device, a base station device that connects to the headquarters device, and a terminal wireless device that wirelessly communicates with the base station device, and includes a slot, a plurality of A press-talk type communication system in which communication is performed using a frame made up of the slot and a set made up of a plurality of the frames, and a communication channel or a control channel is mapped to the slot, wherein the headquarters device The terminal radio device manages a generation number that is a number that changes with updates of broadcast information mapped to a channel, the terminal wireless device holds the generation number, and the head office device transmits the broadcast information to the control channel. When a call state in which an audio signal is transmitted, audio information is mapped to the call channel, and if no audio information exists, the call channel included in a plurality of preset frames in the set is mapped. The generation number is mapped, the generation number and the audio information are not mapped to the communication channels included in the remaining frames of the set, and the base station device maps the audio information when the audio information exists. transmits the speech channel to which the generation number is mapped, and if the voice information does not exist, transmits the speech channel to which the generation number is mapped in a plurality of preset frames in the set, and transmits the speech channel to which the generation number is mapped in a plurality of preset frames in the set, and In the frame, a communication channel to which neither the generation number nor the voice information is mapped is transmitted, the control channel to which the broadcast information is mapped is transmitted to the terminal radio device, and the terminal radio device transmits the voice to the received communication channel. If the information is mapped, voice processing is performed, and if the generation number is mapped to the received call channel, the generation number held by the terminal wireless device and the generation number preset in the set are The generation number mapped to the communication channel included in a plurality of frames is compared, and if the generation number held by the terminal wireless device is different from the generation number mapped to the communication channel, the base station The broadcast information mapped to the control channel transmitted from the station device is received.

According to the first aspect of the technology disclosed in this specification, broadcast information can be received while suppressing power consumption in a terminal wireless device. That is, the terminal wireless device monitors at least the communication channel, and if a generation number is assigned to the communication channel and the generation number is an updated generation number, and receives the control channel, the terminal radio device receives the broadcast information. Able to respond to updates.

Objects, features, aspects, and advantages of the technology disclosed herein will become more apparent from the detailed description and accompanying drawings set forth below.

1 is a diagram schematically illustrating the overall configuration of a wireless communication system according to an embodiment. FIG. 2 is a diagram illustrating a configuration of a TDMA frame according to an embodiment. FIG. 2 is a diagram illustrating downlink transmission timing in a wireless communication system according to an embodiment. FIG. 2 is a block diagram conceptually illustrating the configuration of a headquarters device and the configuration of a base station device according to an embodiment. FIG. 2 is a block diagram conceptually illustrating the configuration of a terminal wireless device according to an embodiment. FIG. 2 is a diagram illustrating a relationship between downlink transmission timing and battery saving of a terminal wireless device in a wireless communication system according to an embodiment. 5 is a flowchart illustrating the operation of the headquarters device according to the embodiment. 3 is a flowchart illustrating the operation of a terminal wireless device according to an embodiment. FIG. 3 is a diagram illustrating a relationship between downlink transmission timing and battery saving of a terminal wireless device in a wireless communication system according to an embodiment. FIG. 3 is a diagram illustrating a configuration in which broadcast information in a control channel is divided into radio frames in accordance with an embodiment; FIG. 2 is a diagram illustrating a relationship between downlink transmission timing and battery saving of a terminal wireless device in a wireless communication system according to an embodiment.

Embodiments will be described below with reference to the accompanying drawings.

Note that the drawings are shown schematically, and for convenience of explanation, structures are omitted or simplified as appropriate. Further, the mutual relationship between the sizes and positions of the structures shown in different drawings is not necessarily described accurately and may be changed as appropriate.

In addition, in the following description, similar components are shown with the same reference numerals, and their names and functions are also the same. Therefore, detailed descriptions thereof may be omitted to avoid duplication.

<First embodiment>
The headquarters device, terminal wireless device, and wireless communication system according to this embodiment will be described below.

<About the configuration of the wireless communication system>
FIG. 1 is a diagram schematically illustrating the overall configuration of a wireless communication system according to the present embodiment. As illustrated in FIG. 1, the wireless communication system includes a headquarters device 10, a base station device 20, a base station device 21, and a terminal wireless device 30.

The headquarters device 10 is a device that accommodates a plurality of base station devices and controls a wireless communication system. The base station device 20 and the base station device 21 are each connected to a terminal wireless device 30 via a wireless line. The base station device 20 and the base station device 21 relay audio signals between the terminal wireless device 30 and the headquarters device 10, and also control the wireless line.

Area 200 is an area in which base station device 20 can communicate. Furthermore, the area 200 is an area that does not receive radio wave interference from the base station device 21.

Area 210 is an area in which base station device 21 can communicate. Furthermore, the area 210 is an area that does not receive radio wave interference from the base station device 20.

Area 300 is an area where communication is possible with both base station device 20 and base station device 21.

The wireless communication system is a system that mainly performs press talk voice communication. In this wireless communication system, an uplink audio signal transmitted from the terminal wireless device 30 is looped back by the headquarters device 10 and transmitted as a downlink audio signal to all base stations, that is, both the base station device 20 and the base station device 21. be done.

Here, the uplink signal is a signal transmitted to the terminal radio device 30, the base station device 20 or base station device 21, and the headquarters device 10 in this order. Further, the downlink signal is a signal transmitted to the headquarters device 10, the base station device 20 or base station device 21, and the terminal wireless device 30 in this order.

In the wireless communication system, the terminal wireless device 30 receives an audio signal output from another terminal wireless device 30 (not shown here) and returned by the headquarters device 10, that is, from the other terminal wireless device 30. In order to receive the outputted downlink audio signal via the headquarters device 10, the communication channel, which is the channel to which audio information is allocated, is monitored. When the terminal wireless device 30 takes in the broadcast information, the terminal wireless device 30 receives the control channel.

The headquarters device 10 continues to transmit the broadcast information cyclically, that is, periodically using the control channel. The terminal wireless device 30 collects broadcast information by receiving the control channel only when necessary.

<About communication format>
Next, a communication format in the wireless communication system according to this embodiment will be explained.

FIG. 2 is a diagram illustrating the structure of a TDMA frame as a wireless communication frame according to this embodiment. The configuration is such that one frame is 40 ms on the wireless line. 25 frames equals 1 second.

Within one frame, four 10 ms slots are provided for each of the uplink and downlink. That is, four slots constitute one frame. Note that the number of slots constituting one frame is not limited to four, and may be any other number. In FIG. 2, Slot1, Slot2, Slot3, and Slot4 correspond to four slots.

Further, one set is composed of 25 frames. Note that the number of radio frames constituting one set is not limited to 25, and may be any other number.

One slot is used as a control channel or a communication channel. Also, for example, the press talk communication channel has an offset of 2 slots, ie, 20 ms, between the transmission slot and the reception slot.

Voice information, which is user information, is mapped, ie, allocated, to the call channel. On the other hand, broadcast information, which is control information, is mapped to the control channel.

For example, the uplink signal transmitted from the terminal radio device 30 in Slot 1 is placed in the downlink signal in Slot 1 of the next frame by the head office device 10 and is returned to the terminal radio device 30 .

The number slot in one frame is set as the communication channel mapping area, that is, the communication channel mapping area, and the slot number is set as the control channel mapping area, ie, the control channel mapping area. Ru. For example, in FIG. 3, in one radio frame, the first slot is the mapping area for the control channel 120, and the second slot is the mapping area for the communication channel.

Note that FIG. 3 is a diagram illustrating downlink transmission timing in the wireless communication system according to the present embodiment.

Furthermore, it is set in advance as to which radio frame in one set the communication channel mapping area is to be used as generation number notification information, that is, the generation number notification channel mapping area. Here, the generation number is a number that is changed as broadcast information is updated. The generation number is held in the terminal radio device 30 that receives the communication channel. Furthermore, the mapping area for generation number notification information, that is, the mapping area for generation number notification channels, is also referred to as the generation number notification information mapping area. For example, in FIG. 3, in the case of a radio frame group 1000 that does not include downlink audio information, the communication channel of the first radio frame and the communication channel of the second radio frame in one set are mapped to the generation number notification information mapping area. and map the generation number notification channel 100, respectively. Alternatively, the communication channel 100 may be mapped with generation number notification information. Alternatively, the generation number notification channel 100 may be mapped using two areas.

In the case of radio frame group 1001 including downlink audio information, the communication channel is mapped to a predetermined communication channel mapping area. That is, in the case of FIG. 3, the communication channel 110 is mapped to each second slot in every radio frame. Alternatively, the communication channel 110 may be mapped with voice information.

On the other hand, in the case of radio frame group 1000 that does not include downlink audio information, audio information is not mapped to the communication channel mapping area. However, generation number notification information, that is, generation number notification channel 100, is mapped to a predetermined generation number notification information mapping area.

Furthermore, neither the generation number notification information nor the voice information is mapped to the call channel 130. For example, a synchronization word for synchronizing the headquarters device and the terminal wireless device may be mapped to the communication channel 130.

FIG. 4 is a block diagram conceptually illustrating the configuration of the headquarters device and the configuration of the base station device according to this embodiment.

The base station device 20 is placed at a wireless relay station or the like. The base station device 20 includes a base station control section 22 and a radio section 24. The base station device 21 is placed at a wireless relay station or the like. The base station device 21 includes a base station control section 26 and a radio section 28.

The radio section 24 and the radio section 28 are relay radio equipment having transmitting and receiving functions. The wireless unit 24 and the wireless unit 28 are installed to relay bidirectional wireless communication between the headquarters device 10 and the terminal wireless devices 30 and between the terminal wireless devices 30.

The base station control unit 22 is equipment for monitoring and controlling the radio unit 24 . The base station control unit 26 is equipment for monitoring and controlling the radio unit 28 .

The base station control unit 22 and the base station control unit 26 may execute programs stored in a storage device, an external CD-ROM, an external DVD-ROM, an external flash memory, or the like. That is, for example, it may be a central processing unit (CPU), a microprocessor, a microcomputer, or a digital signal processor (DSP).

Further, the base station control section 22 and the base station control section 26 may be dedicated hardware. That is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or a combination thereof. It may be.

The headquarters device 10 is located at a central facility or the like. The headquarters device 10 includes a system management section 14 and a communication control section 12.

The system management unit 14 is a facility for monitoring the entire wireless communication system and controlling the operation of the wireless communication system. Specifically, the system management unit 14 monitors the status of each device constituting the wireless communication system or sets various controls.

The system management unit 14 also monitors communication lines within the wireless communication system and controls communication lines within the wireless communication system. Specifically, the system management unit 14 configures the channels used in the wireless line or sets the channel allocation method.

The communication control unit 12 allocates channels to slots in each radio frame according to the channel allocation method set in the system management unit 14. Further, the communication control unit 12 generates broadcast information and updates and manages the generation number of the broadcast information under the control of the system management unit 14. Furthermore, the communication control unit 12 returns an uplink audio signal received from the terminal radio device 30 via the base station device to the terminal radio device 30 .

FIG. 5 is a block diagram conceptually illustrating the configuration of a terminal wireless device according to this embodiment. As illustrated in FIG. 5, the terminal wireless device 30 includes a wireless section 32 and a control section 34.

The radio unit 32 includes a transmitting unit 32B that converts the transmission data from the control unit 34 into a digital signal/analog signal and outputs the transmission data to the antenna 32D, and converts the signal received by the antenna 32D into an analog signal/digital signal. It also includes a receiving section 32C that outputs the signal to the control section 34, and a transmission/reception switching section 32A that relays between the antenna 32D and the transmitting section 32B and between the antenna 32D and the receiving section 32C.

The control section 34 includes a modulation section 34A, a channel CODE section 34C, a demodulation section 34B, a channel DECODE section 34D, a monitoring control section 34E, an operation display section 34F, an audio processing section 34G, and an audio interface section 34H. Equipped with

The control unit 34 may execute a program stored in a storage device, an external CD-ROM, an external DVD-ROM, an external flash memory, or the like. That is, for example, it may be a CPU, a microprocessor, a microcomputer, or a DSP.

Further, the control unit 34 may be dedicated hardware. That is, for example, it may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.

When the terminal radio device 30 receives a downlink signal from the base station device, the received data received by the receiving section 32C is demodulated by the demodulating section 34B. Then, the channel DECODE unit 34D extracts the mapped information from the received data, and the monitoring control unit 34E checks and analyzes the data.

The data confirmation and data analysis herein refers to confirmation and analysis of the presence or absence of audio information, the generation number of broadcast information, or other control information. When audio information is received, the data is processed in the audio processing unit 34G, and further outputted in the audio interface unit 34H, specifically, a speaker or the like.

When transmitting an uplink audio signal from the terminal radio device 30 to the base station device, the audio signal input from the audio interface section 34H, specifically, the microphone or the like, is processed at the audio processing section 34G. The audio signal is then input to the monitoring control section 34E.

After data confirmation and data analysis are performed in the monitoring control unit 34E, the data is mapped to a specified channel configuration in the channel CODE unit 34C. Thereafter, the modulation section 34A modulates the data and outputs a transmission signal to the radio section 32.

The wireless communication system according to this embodiment is a wireless communication system that mainly performs press talk voice communication. Therefore, the terminal radio device 30 monitors the presence or absence of a downlink audio signal from another terminal radio device 30.

FIG. 6 is a diagram illustrating the relationship between downlink transmission timing and battery saving of a terminal wireless device in the wireless communication system according to the present embodiment.

The terminal wireless device 30 receives the call channel and determines whether or not voice information is mapped to the call channel. If it is determined that audio information is mapped, that is, in a case such as the radio frame group 1001 in FIG. 6, the terminal wireless device 30 performs audio signal reception processing.

On the other hand, if it is determined that voice information is not mapped to the call channel, that is, in a case like radio frame group 1000 in FIG. 6, the terminal wireless device 30 determines whether generation number notification information is mapped or not. Decide whether or not. If the generation number notification information is mapped, the terminal wireless device 30 compares the generation number held in the terminal wireless device 30 with the received generation number notification information. If the comparison results are the same, the saving state is maintained until the preset intermittent reception timing. A radio frame group 1002 in FIG. 6 indicates the reception timing of the communication channel of the terminal radio device 30. The terminal wireless device 30 that receives the generation number notification information, compares the generation number held in the terminal wireless device 30 with the received generation number notification information, and determines that they are the same maintains the saving state and does not make a call. Channel 130 may not be received. Note that neither the generation number notification information nor the voice information is mapped to the call channel 130. For example, a synchronization word for synchronizing the headquarters device and the terminal wireless device may be mapped to the communication channel 130.

However, even if voice information is not mapped to the call channel, when it is confirmed that the generation number notification information, that is, the generation number notification channel is mapped to the call channel, the monitoring control unit 34E Compares the generation number of the broadcast information currently held by the generation number of the generation number channel mapped in the received communication channel. In a radio frame group 1003 in FIG. 6, the monitoring control unit 34E of the terminal radio device 30 compares the generation number of the currently stored broadcast information with the generation number of the generation number channel mapped in the received communication channel. The reception timing of the communication channel (generation number notification channel) and the control channel when it is determined that they are different, that is, it is determined that they have been updated, is shown.

If the generation number stored by the supervisory control unit 34E and the generation number of the received generation number channel are different, the supervisory control unit 34E determines that the broadcast information has been updated since the last time the supervisory control unit 34E received the broadcast information. to decide. Thereafter, the terminal wireless device 30 receives the control channel and takes in the updated broadcast information. That is, the control channel in radio frame group 1003 in FIG. 6 is received.

<About the operation of the wireless communication system>
Next, the operation of the wireless communication system according to this embodiment will be explained.

First, the downlink radio frame timing transmitted from the head office device 10 is set to a fixed cycle in which one set, that is, 25 frames is one second, as in the case illustrated in FIG. As illustrated in FIG. 6, for example, the communication channel of the first radio frame and the communication channel of the second radio frame in one set are mapped as the generation number notification channel 100. However, it is sufficient that at least one communication channel is mapped as the generation number notification channel 100 in one radio frame.

When a voice signal is transmitted in a conversation state, the conversation channel is not mapped as a generation number notification channel, but is mapped as a conversation channel in which voice information is allocated to all 25 frames.

Note that depending on the configuration of the radio frame format, it is possible to transmit control information such as generation number notification and voice information at the same time. It is assumed that the number notification channel and the call channel to which voice information is allocated cannot be transmitted at the same time.

The generation number notification channel is a channel that notifies the generation number of broadcast information on the call channel. The terminal radio device 30 determines whether the broadcast information held in the terminal radio device 30 is the latest one based on the generation number in the generation number notification channel. The terminal wireless device 30 then determines whether or not it is necessary to capture the broadcast information.

Next, the battery saving operation of the terminal wireless device 30 will be explained with reference to FIG. Generally, the terminal wireless device 30 enters the saving state when there are no more signals to receive, and maintains the saving state for a certain period of time.

After the above-mentioned certain period of time has elapsed, that is, after the period of intermittent reception has elapsed in FIG. 6, the terminal radio device 30 releases the saving state. Note that in FIG. 6, the period of intermittent reception corresponds to two sets, that is, 50 radio frames.

Further, if the generation number does not change at this point, the terminal wireless device 30 enters the saving state again to extend the battery life.

The longer you stay in the saving state, the more effective your saving will be. However, the uptake of broadcast information becomes slow.

Next, the operation of the terminal wireless device 30 when there is a change in broadcast information will be described. The terminal wireless device 30, which periodically repeats the saving state, cancels the saving state at the timing when the generation number notification channel mapped to the communication channel is transmitted.

Next, the terminal wireless device 30 acquires the generation number of the broadcast information from the generation number notification channel. Then, the terminal radio device 30 determines whether the broadcast information held in the terminal radio device 30 is the latest one by comparing the generation number held in the terminal radio device 30 and the generation number of the generation number channel. Determine whether

If there is a change in the generation number acquired from the generation number notification channel, the terminal radio device 30 determines that the broadcast information held in the terminal radio device 30 is not the latest one. Then, the monitoring control unit 34E of the terminal wireless device 30 changes the reception slot from the communication channel to the control channel. That is, as exemplified by radio frame group 1003 in FIG. 6, control channel broadcast information is taken in from the next radio frame.

After capturing new broadcast information, specifically, one cycle of broadcast information, the terminal wireless device 30 enters the saving state again until the remaining intermittent reception cycle has elapsed. In addition, in FIG. 6, one cycle of broadcast information is described as one set.

Next, the operation of the terminal wireless device 30 when there is no change in broadcast information will be described. The terminal wireless device 30 acquires the generation number of the broadcast information from the generation number notification channel mapped to the communication channel.

Then, if there is no change in the generation number acquired from the generation number notification channel, that is, if the generation number held in the terminal radio device 30 and the generation number of the generation number channel are the same, the terminal radio device 30 As illustrated in the radio frame group 1002 in FIG. 6, the saving state is entered again from the next radio frame. If there is no call, the terminal wireless device 30 remains in the saving state until the remaining intermittent reception cycle elapses.

Next, the operation of the headquarters device 10 will be explained with reference to FIG. Here, FIG. 7 is a flowchart illustrating the operation of the headquarters apparatus according to this embodiment.

First, the headquarters device 10 determines whether an uplink audio signal is received from the terminal wireless device 30 (see step ST01).

Then, when an upstream audio signal is received, the headquarters device 10 maps audio information in the received audio signal to a communication channel. Then, the headquarters device 10 sends back the voice information mapped to the communication channel to the terminal wireless device 30 (see step ST02). Then, the process ends.

On the other hand, if no upstream audio signal is received, the headquarters device 10 determines whether there is broadcast information to be updated (see step ST03). If there is broadcast information to be updated, the headquarters device 10 updates the generation number of the broadcast information (see step ST04). On the other hand, if there is no broadcast information to be updated, the process advances to step ST05. Here, the broadcast information to be updated is, for example, carrier information, that is, carrier frequency information, transmission/reception slot information, communication system information, etc.

Next, the headquarters device 10 maps the generation number to the communication channel (see step ST05). Note that when the generation number of the broadcast information is updated in step ST04, the updated generation number is mapped to the communication channel. Then, the headquarters device 10 transmits the information to the terminal wireless device 30.

Next, the operation of the terminal wireless device 30 will be explained with reference to FIG. Here, FIG. 8 is a flowchart illustrating the operation of the terminal wireless device according to this embodiment.

First, the terminal wireless device 30 receives a communication channel and analyzes information included in the communication channel (see step ST101). Next, the terminal wireless device 30 determines whether voice information is mapped to the received call channel (see step ST102).

If the audio information is mapped to the received call channel, the terminal wireless device 30 performs audio processing. After that, the terminal wireless device 30 outputs the audio signal via the audio interface section 34H (see step ST103).

On the other hand, if the voice information is not mapped to the received call channel, the terminal wireless device 30 determines whether the generation number mapped to the received call channel has been updated ( (See step ST104).

When the generation number of the broadcast information is updated, the monitoring control unit 34E of the terminal radio device 30 changes the reception channel on the downlink from the communication channel to the control channel. Then, the terminal wireless device 30 acquires the broadcast information again (see step ST106). By doing so, it is possible to respond to system changes.

On the other hand, if the generation number of the broadcast information is not updated, the terminal wireless device 30 continues to operate in the saving state (see step ST105).

The operation of this embodiment described above provides, for example, the following effects.

The headquarters device 10 manages updating of the generation number of broadcast information. Then, when the headquarters device 10 updates the broadcast information transmitted on the control channel, it maps the generation number to the communication channel.

The terminal wireless device 30 can collect broadcast information from the control channel when detecting a change in the generation number on the communication channel.

With this configuration, the load of the reception operation on the terminal wireless device 30 can be reduced. Furthermore, it is possible to optimize the intake of broadcast information and battery saving.

By mapping the generation number notification information, that is, the generation number notification channel, to the speech channel mapping area, the terminal radio device 30 receives at least the speech channel mapping region, thereby allowing the terminal radio device 30 to receive voice signals from other terminal radio devices 30. A return signal can be received. Furthermore, at the same time, the terminal wireless device 30 can also know that an update of the broadcast information has occurred.

Furthermore, in the mapping area of the generation number notification information, that is, the mapping area of the generation number notification channel, if downlink voice information is included, the generation number notification information is not mapped, but the communication channel is mapped. Thereby, by monitoring the mapping area of the generation number notification information, the terminal radio device 30 can receive a return signal of a voice signal from another terminal radio device 30. Furthermore, at the same time, the terminal wireless device 30 can also know that an update of the broadcast information has occurred.

<Second embodiment>
A headquarters device, a terminal wireless device, and a wireless communication system according to this embodiment will be described. In the following description, structures similar to those described in the embodiments described above will be illustrated with the same reference numerals, and detailed description thereof will be omitted as appropriate.

In the first embodiment, taking as an example a case where there is no call, that is, a case where voice information is not included in the call channel, the effect that the load on the reception operation of the terminal radio device 30 can be reduced, and the notification The effects of optimizing information intake and battery saving were demonstrated. The present embodiment will further be described using an example when there is a call, that is, when voice information is included in the call channel.

FIG. 9 is a diagram illustrating the relationship between downlink transmission timing and battery saving of a terminal wireless device in the wireless communication system according to the present embodiment. The downlink radio frame timing transmitted from the headquarters device 10 and the battery saving operation of the terminal radio device 30 are the same as those illustrated in the first embodiment.

Next, the operation of the wireless communication system according to this embodiment will be explained. Upon receiving the communication channel to which voice information is mapped on the downlink, the terminal radio device 30 cancels the saving state.

The head office device 10 continues to transmit the generation number notification channel after the call ends on the transmitting downlink. That is, the headquarters device 10 assigns the generation number of the broadcast information to at least one communication channel in a wireless communication frame that does not include voice information and is continuously transmitted after a wireless communication frame that includes voice information. The head office device 10 continuously assigns generation numbers of broadcast information to call channels regardless of whether or not the intermittent reception period has elapsed after the end of the call. Further, the terminal wireless device 30 continues to receive the call channel, which is the generation number notification channel, after the end of the call, regardless of whether the intermittent reception cycle has elapsed.

By doing so, for example, if there is a change in the generation number in the generation number notification channel, as in the radio frame group 1004 illustrated in FIG. be able to.

For comparison of operations, reference will be made to the operation of the wireless communication system when the notification channel is not transmitted after the end of the call, as in the radio frame group 1005 illustrated in FIG.

In a case like the radio frame group 1005 illustrated in FIG. 9, the terminal radio device 30 is in the saving state until the intermittent reception period elapses after the end of the call. Therefore, the terminal wireless device 30 receives the generation number notification channel at the timing of the next cancellation of the saving state.

Therefore, the reception of the broadcast information by the terminal radio device 30 is delayed by the time, that is, one cycle of intermittent reception.

Next, from the viewpoint of battery saving effects, the radio frame group 1004 in FIG. 9 will be compared with the radio frame group 1005 in FIG. 9.

The number of radio frames received by the terminal radio device 30 is the same in the radio frame group 1004 in FIG. 9 and the radio frame group 1005 in FIG. However, in the radio frame group 1004 in FIG. 9, generation number notification channels can be continuously captured during one saving operation cancellation. Therefore, the number of saving operations, that is, the number of ON/OFF switching of saving, is smaller in the radio frame group 1004 in FIG. 9 than in the radio frame group 1005 in FIG. Therefore, the radio frame group 1004 in FIG. 9 has a higher saving effect.

As described above, by the head office device 10 continuously reporting the generation number after the end of the call, the terminal wireless device 30 can continuously receive the generation notification number from the start of the call. Further, if there is a change in the generation number in the generation number notification channel, the terminal wireless device 30 can capture broadcast information following the generation notification number.

Therefore, the number of times saving is switched can be reduced. Furthermore, it is possible to optimize the intake of broadcast information and battery saving.

<Third embodiment>
A headquarters device, a terminal wireless device, and a wireless communication system according to this embodiment will be described. In the following description, structures similar to those described in the embodiments described above will be illustrated with the same reference numerals, and detailed description thereof will be omitted as appropriate.

In this embodiment, an example of improving battery life will be described.

FIG. 10 is a diagram illustrating a configuration when broadcast information in a control channel is divided into categories. The headquarters device 10 maps the broadcast information of each category to the control channel of the radio frame number in FIG. 10 and transmits it to the terminal radio device 30.

Next, the operation of the wireless communication system according to this embodiment will be explained. FIG. 11 is a diagram illustrating the relationship between downlink transmission timing and battery saving of a terminal wireless device in the wireless communication system according to the present embodiment.

In the radio frame group 1006 in FIG. 11, the second slot in the first radio frame in one set is the mapping area of the generation number notification channel 100, and the second slot in the second radio frame in one set is the mapping area of the generation number notification channel 100. The slot of 1 is the mapping area of the generation number notification channel 100.

Furthermore, a radio frame group 1007 in FIG. 11 shows the reception timing of the call channel, the generation number notification channel, and the control channel when the generation number notification channel is transmitted after the end of the call.

Note that the downlink radio frame timing transmitted from the headquarters device 10 and the battery saving operation of the terminal radio device 30 are the same as those illustrated in the first embodiment and the second embodiment. It is the same as when

In this embodiment, a generation number is notified for each category of broadcast information.

Upon detecting a change in the generation number, the terminal radio device 30 receives a control channel to capture broadcast information using a procedure similar to that exemplified in the first embodiment and the second embodiment.

The terminal radio device 30 determines whether the generation number for each category in the received generation number notification channel has been updated, and selects the control CH of the radio frame to which the broadcast information of the category determined to have been updated is mapped. receive. FIG. 11 illustrates a case where the notification information of category number "1" and category number "2" has been updated. As exemplified by radio frame group 1007 in FIG. 11, it is possible to determine in which radio frame broadcast information to be reacquired is transmitted. That is, by determining which category of generation number has been updated, it is possible to determine the radio frame in which the changed broadcast information is transmitted. Therefore, the terminal wireless device 30 identifies the type of broadcast information that needs to be updated, that is, the type of broadcast information whose generation number has changed, and performs reception operations in accordance with the timing of the radio frame that includes the relevant type of broadcast information. It can be performed. The terminal wireless device 30 can then compare generation numbers for each type of broadcast information. Note that after capturing the changed broadcast information, the terminal wireless device 30 enters the saving state.

Therefore, the terminal wireless device 30 can enter the saving state at the radio frame timing when broadcast information that does not need to be updated, that is, broadcast information whose generation number has not changed, is transmitted.

Through the above-described operations, the wireless communication system according to the present embodiment can improve the battery life of the terminal wireless device 30.

<About the effects produced by the embodiments described above>
Next, effects produced by the embodiment described above will be illustrated. Note that in the following explanation, the effects will be described based on the specific configurations exemplified in the embodiments described above, but the effects illustrated in the specification of the present application will be described to the extent that similar effects are produced. It may be replaced with other specific configurations.

Further, the replacement may be made across multiple embodiments. That is, the respective configurations illustrated in different embodiments may be combined to produce similar effects.

According to the embodiment described above, the headquarters device includes a management unit that manages generation numbers of broadcast information and a communication control unit 12 that controls wireless communication. The communication control unit 12 then assigns broadcast information to the control channel 120. Then, if the wireless communication frame to be transmitted includes audio information, the communication control unit 12 allocates the audio information to the call channel 110 in the wireless communication frame. When the wireless communication frame to be transmitted does not include audio information, the communication control unit 12 assigns the generation number of the broadcast information to at least one of the communication channels 110 in the wireless communication frame. Here, the management section corresponds to, for example, the system management section 14.

According to such a configuration, broadcast information can be received while suppressing power consumption in the terminal wireless device 30. That is, if the terminal wireless device monitors at least the communication channel 110 and receives the control channel 120 when a generation number is assigned to the communication channel 110 and the generation number is an updated generation number, It is possible to respond to updates of broadcast information. Therefore, operation control in the terminal wireless device 30 is not complicated. Furthermore, since it is not necessary for the terminal radio device 30 to constantly monitor the control channel 120, the battery life of the terminal radio device 30 can be improved.

Note that other configurations exemplified in this specification other than these configurations can be omitted as appropriate. That is, if at least these configurations are provided, the effects described above can be produced.

However, if at least one of the other configurations exemplified in the specification of the present application is appropriately added to the configuration described above, that is, the configuration exemplified in the specification of the present application that is not described as the configuration described above. Even if other configurations are added to the configuration described above, the effects described above can be produced in the same way.

Further, according to the embodiment described above, the management unit updates the generation number of the broadcast information when the broadcast information is updated. Then, if the wireless communication frame to be transmitted does not include voice information, the communication control unit 12 assigns the generation number of the updated broadcast information to at least one of the communication channels 110 in the wireless communication frame. . Here, the management section corresponds to, for example, the system management section 14. According to such a configuration, the terminal radio device 30 monitors at least the call channel 110, and performs control when a generation number is assigned to the call channel 110 and the generation number is an updated generation number. If channel 120 is received, it is possible to update broadcast information. Therefore, operation control in the terminal wireless device 30 is not complicated. Furthermore, since it is not necessary for the terminal radio device 30 to constantly monitor the control channel 120, the battery life of the terminal radio device 30 can be improved.

Further, according to the embodiment described above, the broadcast information is classified into a plurality of types. Then, the management unit updates the corresponding generation number for each type of updated broadcast information. Here, the management section corresponds to, for example, the system management section 14. According to such a configuration, the terminal wireless device 30 identifies the type of broadcast information that needs to be updated, that is, the type of broadcast information whose generation number has changed, and updates the radio frame that includes the relevant type of broadcast information. The receiving operation can be performed in accordance with the timing. The terminal wireless device 30 can then compare generation numbers for each type of broadcast information. Therefore, the terminal wireless device 30 can enter the saving state at the radio frame timing when broadcast information that does not need to be updated, that is, broadcast information whose generation number has not changed, is transmitted. Therefore, the battery life of the terminal wireless device 30 can be improved.

Further, according to the embodiment described above, the communication control unit 12 controls at least one of the call channels 110 in a wireless communication frame that does not include voice information and that follows a wireless communication frame that includes voice information. A generation number of broadcast information is assigned to the communication channel 110. According to such a configuration, if there is a change in the generation number, the terminal wireless device 30 can continue to capture broadcast information after the end of the call. Therefore, it is possible to prevent delays in the reception of broadcast information by the terminal wireless device 30. Furthermore, since the number of ON/OFF switching of the saving is reduced, the saving effect of the terminal wireless device 30 is enhanced.

According to the embodiment described above, the terminal wireless device holds the generation number of broadcast information. The terminal wireless device includes at least a receiving section 32C that receives the communication channel 110, and a reception control section that controls the operation of the receiving section 32C. When the generation number of the broadcast information is assigned to the call channel 110, the reception control unit compares the generation number of the broadcast information held by the terminal radio device 30 with the generation number of the broadcast information assigned to the call channel 110. If the generation number of the broadcast information held by the terminal wireless device 30 is different from the generation number of the broadcast information assigned to the communication channel 110, the receiver 32C is caused to receive the broadcast information assigned to the control channel 120. Here, the reception control section corresponds to, for example, the monitoring control section 34E.

According to such a configuration, broadcast information can be received while suppressing power consumption in the terminal wireless device 30. That is, if the terminal wireless device monitors at least the communication channel 110 and receives the control channel 120 when a generation number is assigned to the communication channel 110 and the generation number is an updated generation number, It is possible to respond to updates of broadcast information.

Note that other configurations exemplified in this specification other than these configurations can be omitted as appropriate. That is, if at least these configurations are provided, the effects described above can be produced.

However, if at least one of the other configurations exemplified in the specification of the present application is appropriately added to the configuration described above, that is, the configuration exemplified in the specification of the present application that is not described as the configuration described above. Even if other configurations are added to the configuration described above, the effects described above can be produced in the same way.

Further, according to the embodiment described above, when the generation number in which the broadcast information has been updated is assigned to the communication channel 110, the reception control unit causes the reception unit 32C to transmit the broadcast information assigned to the control channel 120. Receive information. Here, the reception control section corresponds to, for example, the monitoring control section 34E. According to such a configuration, the terminal radio device 30 monitors at least the call channel 110, and performs control when a generation number is assigned to the call channel 110 and the generation number is an updated generation number. If channel 120 is received, it is possible to update the broadcast information. Therefore, operation control in the terminal wireless device 30 is not complicated. Furthermore, since it is not necessary for the terminal radio device 30 to constantly monitor the control channel 120, the battery life of the terminal radio device 30 can be improved.

Further, according to the embodiment described above, the broadcast information is classified into a plurality of types. Then, when the generation number of the broadcast information is assigned to the call channel 110, the reception control unit determines the generation number of the broadcast information held by the terminal radio device 30 and the generation number of the broadcast information assigned to the call channel 110 for each type of broadcast information. Compare with the generation number of broadcast information. Here, the reception control section corresponds to, for example, the monitoring control section 34E. According to such a configuration, the terminal wireless device 30 identifies the type of broadcast information that needs to be updated, that is, the type of broadcast information whose generation number has changed, and updates the radio frame that includes the relevant type of broadcast information. The receiving operation can be performed in accordance with the timing. After capturing the broadcast information, the terminal wireless device 30 can enter a saving state. Therefore, the terminal radio device 30 can enter a saving state at the radio frame timing when broadcast information that does not need to be updated, that is, broadcast information whose generation number has not changed, is transmitted. You can improve your running time.

Further, according to the embodiment described above, in the wireless communication system, the terminal wireless device 30 holds the generation number of broadcast information. The headquarters device 10 includes a management section that manages generation numbers of broadcast information, and a communication control section 12 that controls wireless communication. The communication control unit 12 then assigns broadcast information to the control channel 120. Then, if the wireless communication frame to be transmitted includes audio information, the communication control unit 12 allocates the audio information to the call channel 110 in the wireless communication frame. When the wireless communication frame to be transmitted does not include audio information, the communication control unit 12 assigns the generation number of the broadcast information to at least one of the communication channels 110 in the wireless communication frame. Furthermore, the terminal wireless device 30 includes at least a receiving section 32C that receives the communication channel 110, and a reception control section that controls the operation of the receiving section 32C. Then, when the generation number of the broadcast information is assigned to the call channel 110, the reception control unit determines the generation number of the broadcast information held by the terminal radio device 30 and the generation number of the broadcast information assigned to the call channel 110. When the generation number of the broadcast information held by the terminal wireless device 30 is different from the generation number of the broadcast information assigned to the communication channel 110, the reception unit 32C receives the broadcast information assigned to the control channel 120. let Here, the management section corresponds to, for example, the system management section 14. Further, the reception control section corresponds to, for example, the monitoring control section 34E. According to such a configuration, broadcast information can be received while suppressing power consumption in the terminal wireless device 30. That is, if the terminal radio device 30 monitors at least the communication channel 110 and receives the control channel 120 when a generation number is assigned to the communication channel 110 and the generation number is an updated generation number, , it is possible to respond to updates of broadcast information.

<About modifications of the embodiment described above>
In the embodiments described above, the dimensions, shapes, relative arrangement relationships, implementation conditions, etc. of each component may be described, but these are illustrative in all aspects, and the specification of this application is It shall not be limited to what is written in the book.

Accordingly, countless variations and equivalents not illustrated are envisioned within the scope of the technology disclosed herein. For example, when at least one component is modified, added, or omitted, or when at least one component in at least one embodiment is extracted and combined with a component in another embodiment. shall be included.

Further, unless a contradiction occurs, it is assumed that "one or more" components described as being provided in the embodiments described above may be provided.

Furthermore, each component in the embodiments described above is a conceptual unit, and within the scope of the technology disclosed in this specification, a case where one component consists of a plurality of structures This includes a case where one component corresponds to a part of a certain structure, and a case where a plurality of components are included in one structure.

Furthermore, each component in the embodiments described above includes structures having other structures or shapes as long as they exhibit the same function.

Further, the description herein is referred to for all purposes relating to the present technology and is not admitted to be prior art.

Furthermore, each of the components described in the embodiments described above is assumed to be software or firmware, and hardware corresponding thereto, and in both concepts, each component is referred to as a "part". It is also called a "processing circuit."

10 headquarters device, 12 communication control unit, 14 system management unit, 20, 21 base station device, 22, 26 base station control unit, 24, 28, 32 radio unit, 30 terminal radio device, 32A transmission/reception switching unit, 32B transmitting unit , 32C reception section, 32D antenna, 34 control section, 34A modulation section, 34B demodulation section, 34C channel CODE section, 34D channel DECODE section, 34E monitoring control section, 34F operation display section, 34G audio processing section, 34H audio interface section, 100 generation number notification channel, 110 communication channel, 120 control channel, 200, 210, 300 area, 1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007 radio frame group.

Claims (2)

comprising a headquarters device, a base station device that connects to the headquarters device, and a terminal wireless device that wirelessly communicates with the base station device,
A press-talk communication system that communicates using a slot, a frame made up of a plurality of said slots, and a set made up of a plurality of said frames, and in which a speech channel or a control channel is mapped to said slot,
The head office device is
Managing a generation number that is a number that changes with updating of broadcast information mapped to the control channel,
The terminal wireless device is
retaining the generation number;
The head office device is
mapping the broadcast information to the control channel;
When a call state is reached in which a voice signal is transmitted, mapping voice information to the call channel;
If voice information does not exist, the generation number is mapped to communication channels included in a plurality of preset frames in the set, and the generation number and the communication channels included in the remaining frames of the set are mapped. Neither of the audio information is mapped,
The base station device includes:
If the voice information exists, transmitting a call channel to which the voice information is mapped;
If the voice information does not exist, the communication channel to which the generation number is mapped is transmitted in a plurality of preset frames in the set, and in the remaining frames of the set, both the generation number and the voice information are transmitted. send an unmapped call channel,
transmitting the control channel on which the broadcast information is mapped to the terminal wireless device;
The terminal wireless device is
If audio information is mapped to the received call channel, perform audio processing;
If the generation number is mapped to the received call channel, the generation number held by the terminal wireless device and the call channel mapped to the call channel included in a plurality of frames preset in the set. Compare with the generation number,
If the generation number held by the terminal wireless device and the generation number mapped to the communication channel are different, receiving the broadcast information mapped to the control channel transmitted from the base station device;
Communications system. comprising a headquarters device, a base station device that connects to the headquarters device, and a terminal wireless device that wirelessly communicates with the base station device,
The terminal radio is used in a press-talk type communication system in which communication is performed using a slot, a frame made up of a plurality of the slots, and a set made of a plurality of the frames, and a communication channel or a control channel is mapped to the slot. A device,
Holds a generation number that is a number that changes with updating of broadcast information mapped to the control channel,
If audio information is mapped to the received call channel, perform audio processing;
If the generation number is mapped to the received call channel, the generation number held by the terminal wireless device and the call channel mapped to the call channel included in a plurality of frames preset in the set. Compare with the generation number,
If the generation number held by the terminal wireless device and the generation number mapped to the communication channel are different, receiving the broadcast information mapped to the control channel transmitted from the base station device;
Terminal radio equipment.

Images