Communication system, terminal wireless device

Abstract

To provide a wireless communication technique that can receive broadcast information while keeping down power consumption in a terminal wireless device.SOLUTION: A communication system 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. When a generation number is mapped in a mapping area of a received generation number of a call channel and a generation number held by the terminal wireless device is different from the generation number mapped in the generation number mapping area of the call channel, broadcast information mapped to a control channel transmitted from the base station device is received.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The technology disclosed in this specification relates to a technology in a communication system that performs communication. [Background technology]

[0002] A time division multiple access (TDMA) digital wireless communication system includes a headquarters device, a base station device, and terminal wireless devices, etc. A TDMA digital wireless communication system is a wireless communication system in which a mobile individual has a terminal wireless device, or a mobile vehicle or the like is equipped with a terminal wireless device, and mainly performs voice communication with an existing communication network or between terminal wireless devices.

[0003] In the TDMA method adopted in this digital wireless communication system, a technology is generally known in which a control channel (hereinafter sometimes referred to as a control CH) is used to notify terminal wireless devices of broadcast information, which is information necessary for system operation.

[0004] The notification information is a signal that is cyclically, i.e. periodically, transmitted from the headquarters device using multiple radio frames. The terminal radio device receives the notification information via a radio line. The terminal radio device operates after the received notification information reaches one cycle.

[0005] In order to receive the broadcast information, the terminal wireless device needs to constantly receive the above-mentioned control channel in addition to a call channel (hereinafter sometimes referred to as a call CH), as exemplified in Patent Document 1, for example.

[0006] In addition, in order to prevent the terminal wireless device from constantly receiving notification information, a method has been adopted in which a warning channel (hereinafter sometimes referred to as a warning CH) is transmitted to the terminal wireless device only when the content of the notification information changes, as exemplified in Patent Document 2, for example. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2000-115068 A [Patent Document 2] Japanese Patent Application Publication No. 11-317978 Summary of the Invention [Problem to be solved by the invention]

[0008] Conventional TDMA digital wireless communication systems are configured as described above, and therefore, for example, in the case of Patent Document 1, the terminal wireless device needs to continuously receive control channels in addition to the speech channels, which increases the power consumption of the terminal wireless device and shortens the battery life.

[0009] Also, for example, in the case of Patent Document 2, one slot in a radio frame is occupied by the warning channel, which causes a problem of poor usage efficiency of the call channel. Also, for example, in the case of Patent Document 2, the terminal radio device needs to receive the warning channel separately, which complicates the control operation in the terminal radio device. This causes a problem of increased power consumption in the terminal radio device, which shortens the battery life.

[0010] The technology disclosed in this specification has been made to solve the problems described above, and relates to a wireless communication technology that can receive notification information while reducing power consumption in a terminal wireless device. [Means for solving the problem]

[0011] A first aspect of the technology disclosed in the present specification is a communication system comprising a headquarters device, a base station device connected to the headquarters device, and a terminal radio device that wirelessly communicates with the base station device, and communicates using slots, frames consisting of a plurality of the slots, and sets consisting of a plurality of the frames, and a call channel or a control channel is mapped to each of the slots, wherein the headquarters device manages a generation number that is a number that changes with updates of broadcast information mapped to the control channel, and the terminal radio device holds the generation number, the headquarters device maps the broadcast information to the control channel, and when a call state in which a voice signal is transmitted is reached, maps voice information to the call channel, and when no voice information is present, To , of said set Two consecutive The communication channel of the frame To The base station device maps the generation number, and maps neither the generation number nor the voice information to the communication channels included in the remaining frames of the set. If the voice information exists, the base station device transmits the communication channel to which the voice information is mapped, and if the voice information does not exist, To , of said set Two consecutive The frame To a communication channel to which the generation number is mapped, and in the remaining frames of the set, a communication channel to which neither the generation number nor the voice information is mapped is transmitted, and the control channel to which the broadcast information is mapped is transmitted to the terminal radio device, and the terminal radio device performs voice processing when voice information is mapped to the received communication channel, and transmits the control channel to which the broadcast information is mapped, and transmits the control channel to the terminal radio device when voice information is mapped to the received communication channel. To the generation number is mapped and held by the terminal wireless device; Received The speech channel To If the mapped generation number is different, the broadcast information mapped to the control channel transmitted from the base station device is received. Effect of the Invention

[0012] According to the first aspect of the technology disclosed in the present specification, it is possible to receive broadcast information while suppressing power consumption in a terminal wireless device. That is, the terminal wireless device can respond to updates of the broadcast information by at least monitoring a communication channel, and receiving a control channel when a generation number is assigned to the communication channel and the generation number is an updated generation number.

[0013] Objects, features, aspects and advantages of the technology disclosed herein will become more apparent from the detailed description set forth below and the accompanying drawings. [Brief description of the drawings]

[0014] [Figure 1] 1 is a diagram illustrating a schematic example of an overall configuration of a wireless communication system according to an embodiment. [Diagram 2] FIG. 2 is a diagram illustrating a configuration of a TDMA frame according to an embodiment. [Diagram 3] FIG. 2 is a diagram illustrating downlink transmission timing in a wireless communication system according to an embodiment. [Figure 4] 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. [Diagram 5] 1 is a block diagram conceptually illustrating a configuration of a terminal wireless device according to an embodiment; [Figure 6] 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. [Figure 7] 10 is a flowchart illustrating an operation of a headquarters device according to an embodiment. [Figure 8] 4 is a flowchart illustrating an operation of a terminal wireless device according to an embodiment. [Figure 9] 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. [Figure 10]1 is a diagram illustrating an example of a configuration in which broadcast information in a control channel is divided for each radio frame according to an embodiment. FIG. [Figure 11] 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, embodiments will be described with reference to the accompanying drawings.

[0016] The drawings are schematic, and for the convenience of explanation, components are omitted or simplified as appropriate. Furthermore, the size and positional relationship of components shown in different drawings are not necessarily accurately described, and may be changed as appropriate.

[0017] In the following description, the same components are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed descriptions thereof may be omitted to avoid duplication.

[0018] <First embodiment> The headquarters device, the terminal radio device, and the radio communication system according to this embodiment will be described below.

[0019] <Configuration of wireless communication system> 1 is a diagram illustrating a schematic 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.

[0020] The headquarters device 10 is a device that accommodates multiple base station devices and controls the wireless communication system. The base station device 20 and the base station device 21 are each connected to the terminal wireless device 30 via a wireless line. The base station device 20 and the base station device 21 relay voice signals between the terminal wireless device 30 and the headquarters device 10, and also control the wireless line.

[0021] The area 200 is an area in which the base station device 20 can communicate. The area 200 is also an area in which the base station device 21 does not experience radio wave interference.

[0022] The area 210 is an area in which the base station device 21 can communicate. The area 210 is also an area in which radio wave interference from the base station device 20 does not occur.

[0023] Area 300 is a region in which communication with both base station device 20 and base station device 21 is possible.

[0024] The wireless communication system is a system for mainly performing press-to-talk voice communication. In the wireless communication system, an upstream voice signal transmitted from a terminal wireless device 30 is returned by the headquarters device 10 and transmitted as a downstream voice signal to all base stations, i.e., both the base station device 20 and the base station device 21.

[0025] Here, an upstream signal is a signal transmitted in the order of terminal radio equipment 30, base station equipment 20 or base station equipment 21, and headquarters equipment 10. A downstream signal is a signal transmitted in the order of headquarters equipment 10, base station equipment 20 or base station equipment 21, and terminal radio equipment 30.

[0026] In this wireless communication system, the terminal radio device 30 monitors a call channel, which is a channel to which voice information is assigned, in order to receive a voice signal output from another terminal radio device 30 (not shown here) and looped back by the headquarters device 10, i.e., a downstream voice signal output from another terminal radio device 30 via the headquarters device 10. When the terminal radio device 30 takes in report information, it receives a control channel.

[0027] The headquarters device 10 continues to transmit the notification information cyclically, that is, periodically, using the control channel. The terminal radio device 30 collects the notification information by receiving the control channel only when necessary.

[0028] <About communication formats> Next, a communication format in the wireless communication system according to this embodiment will be described.

[0029] 2 is a diagram illustrating the configuration of a TDMA frame as a wireless communication frame according to this embodiment. It is assumed that one frame in a wireless line is 40 ms, and 25 frames make up one second.

[0030] Within one frame, four slots of 10 ms each are provided for each of the uplink and downlink. That is, one frame is made up of four slots. The number of slots constituting one frame is not limited to four, and may be other numbers. In FIG. 2, Slot1, Slot2, Slot3, and Slot4 correspond to the four slots.

[0031] Moreover, one set is made up of 25 frames. Note that the number of radio frames making up one set is not limited to 25 and may be another number.

[0032] One slot is used as a control channel or a speech channel. For example, a press-to-talk speech channel has an offset of 2 slots, i.e., 20 ms, between the transmit slot and the receive slot.

[0033] User information such as voice information is mapped, i.e., allocated, to the speech channel, whereas control information such as broadcast information is mapped to the control channel.

[0034] For example, an upstream signal transmitted from the terminal radio device 30 in Slot 1 is placed in the downstream signal in Slot 1 of the next frame by the headquarters device 10 and is looped back to the terminal radio device 30 .

[0035] It is preset which slot in one frame is to be the mapping region of the traffic channel, i.e., the traffic channel mapping region, and which slot is to be the mapping region of the control channel, i.e., the control channel mapping region. For example, in Fig. 3, the first slot in one radio frame is the mapping region of the control channel 120, and the second slot is the mapping region of the traffic channel.

[0036] FIG. 3 is a diagram illustrating downlink transmission timing in the wireless communication system according to this embodiment.

[0037] Also, which radio frame in one set should have its traffic channel mapping area set as the generation number notification information, i.e., the mapping area of ​​the generation number notification channel, is set in advance. Here, the generation number is a number that is changed with the update of the broadcast information. The generation number is held in the terminal radio device 30 that receives the traffic channel. Also, the mapping area of ​​the generation number notification information, i.e., the mapping area of ​​the generation number notification channel, is also called 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 voice information, the traffic channel of the first radio frame and the traffic channel of the second radio frame in one set are set as the generation number notification information mapping area, and the generation number notification channel 100 is mapped to each of them. Alternatively, the traffic channel 100 to which the generation number notification information is mapped may be used. Alternatively, the generation number notification channel 100 may be mapped using two areas.

[0038] In the case of a radio frame group 1001 including downstream voice information, the traffic channel is mapped to a predetermined traffic channel mapping area. That is, in the case of Fig. 3, the traffic channel 110 is mapped to each of the second slots in all the radio frames. Alternatively, the traffic channel 110 may be one onto which voice information is mapped.

[0039] On the other hand, in the case of a radio frame group 1000 that does not include downlink voice information, the voice information is not mapped to the speech channel mapping area. However, the generation number notification information, i.e., the generation number notification channel 100, is mapped to a predetermined generation number notification information mapping area.

[0040] Moreover, neither generation number notification information nor voice information is mapped onto the speech channel 130. For example, a synchronization word for synchronizing the headquarters device and the terminal wireless device may be mapped onto the speech channel 130.

[0041] 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.

[0042] The base station device 20 is disposed in a wireless relay station or the like. The base station device 20 includes a base station control unit 22 and a wireless unit 24. The base station device 21 is disposed in a wireless relay station or the like. The base station device 21 includes a base station control unit 26 and a wireless unit 28.

[0043] The wireless units 24 and 28 are relay wireless equipment having transmission and reception capabilities. The wireless units 24 and 28 are installed to relay two-way wireless communications between the headquarters device 10 and the terminal wireless devices 30, and between the terminal wireless devices 30 themselves.

[0044] The base station control unit 22 is a facility for monitoring and controlling the radio unit 24. The base station control unit is a facility for monitoring and controlling the radio unit .

[0045] The base station control unit 22 and the base station control unit 26 may execute a program stored in a storage device, an external CD-ROM, an external DVD-ROM, an external flash memory, etc. That is, they may be, for example, a central processing unit (CPU), a microprocessor, a microcomputer, or a digital signal processor (DSP).

[0046] Additionally, base station controller 22 and base station controller 26 may be dedicated hardware, i.e., 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, for example.

[0047] The headquarters device 10 is disposed in a central facility, etc. The headquarters device 10 includes a system management unit 14 and a communication control unit 12.

[0048] The system management unit 14 is a device 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 and sets various controls.

[0049] The system management unit 14 also monitors and controls the communication lines in the wireless communication system. Specifically, the system management unit 14 sets the configuration of channels used in the wireless lines, the channel allocation method, and the like.

[0050] The communication control unit 12 allocates channels to slots in each radio frame according to a channel allocation method set by the system management unit 14. The communication control unit 12 also generates broadcast information and updates and manages the generation numbers of the broadcast information under the control of the system management unit 14. The communication control unit 12 also loops back, to the terminal radio device 30, an uplink voice signal received from the terminal radio device 30 via the base station device.

[0051] 5 is a block diagram conceptually illustrating the configuration of a terminal radio device according to this embodiment. As illustrated in FIG. 5, a terminal radio device 30 includes a radio unit 32 and a control unit .

[0052] The radio unit 32 includes a transmitting unit 32B that converts transmission data from the control unit 34 into a digital signal / analog signal and outputs the transmission data to the antenna 32D, a receiving unit 32C that converts a signal received by the antenna 32D into an analog signal / digital signal and outputs the signal to the control unit 34, and a transmission / reception switching unit 32A that relays between the antenna 32D and the transmitting unit 32B, and between the antenna 32D and the receiving unit 32C.

[0053] The control unit 34 includes a modulation unit 34A, a channel coding unit 34C, a demodulation unit 34B, a channel decoding unit 34D, a monitor control unit 34E, an operation display unit 34F, a voice processing unit 34G, and a voice interface unit 34H.

[0054] 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, etc. That is, it may be, for example, a CPU, a microprocessor, a microcomputer, or a DSP.

[0055] The controller 34 may also be dedicated hardware, i.e., a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.

[0056] When the terminal radio device 30 receives a downlink signal from a base station device, the received data received by the receiver 32C is demodulated by the demodulator 34B. Then, the channel decoder 34D extracts mapped information from the received data, and the monitor and controller 34E checks and analyzes the data.

[0057] The confirmation of data and the analysis of data here refer to the confirmation and analysis of the presence or absence of voice information, the generation number of the notification information, or other control information, etc. When voice information is received, the data is processed in the voice processing unit 34G, and is further outputted from the voice interface unit 34H, specifically, a speaker or the like.

[0058] When an upstream voice signal is transmitted from the terminal radio device 30 to the base station device, the voice signal input from the voice interface unit 34H, specifically, a microphone or the like, is processed in the voice processing unit 34G. Then, the voice signal is input to the monitor control unit 34E.

[0059] Then, after the monitoring control unit 34E checks and analyzes the data, the channel coding unit 34C maps the data to a specified channel configuration. Then, the modulation unit 34A modulates the data and outputs a transmission signal to the wireless unit 32.

[0060] The wireless communication system according to this embodiment is a wireless communication system that mainly performs press-to-talk voice communication. Therefore, the terminal wireless device 30 monitors the presence or absence of a downstream voice signal from another terminal wireless device 30.

[0061] FIG. 6 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 this embodiment.

[0062] The terminal radio device 30 receives the speech channel and judges whether or not voice information is mapped to the speech channel. If it is judged that voice information is mapped, that is, in the case of the wireless frame group 1001 in Fig. 6, the terminal radio device 30 performs a receiving process of the voice signal.

[0063] On the other hand, when it is determined that the voice information is not mapped to the speech channel, that is, in the case of the wireless frame group 1000 in FIG. 6, the terminal wireless device 30 determines whether the generation number notification information is mapped. When 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 result shows that they are the same, the saving state is maintained until the timing of the intermittent reception set in advance. The wireless frame group 1002 in FIG. 6 shows the reception timing of the speech channel of the terminal wireless device 30. The terminal wireless device 30 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 need to receive the speech channel 130. Note that neither the generation number notification information nor the voice information is mapped to the speech channel 130. For example, a synchronization word for synchronizing the headquarters device and the terminal wireless device may be mapped to the speech channel 130.

[0064] However, even if voice information is not mapped to the speech channel, when it is confirmed that generation number notification information, i.e., a generation number notification channel, is mapped to the speech channel, the monitor and control unit 34E compares the generation number of the broadcast information currently held by the terminal radio device 30 with the generation number of the generation number channel mapped in the received speech channel. Radio frame group 1003 in Fig. 6 shows the reception timing of the speech channel (generation number notification channel) and the control channel when the monitor and 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 speech channel and determines that they are different, i.e., when they have been updated.

[0065] If the generation number stored by the monitoring control unit 34E is different from the generation number of the received generation number channel, the monitoring control unit 34E determines that the broadcast information has been updated since the monitoring control unit 34E last received the broadcast information. After that, the terminal radio device 30 receives the control channel and takes in the updated broadcast information. That is, it receives the control channel in the radio frame group 1003 in FIG. 6.

[0066] <Operation of wireless communication system> Next, the operation of the wireless communication system according to this embodiment will be described.

[0067] First, the timing of the wireless frame on the downlink transmitted from the headquarters device 10 is set to a fixed cycle in which one set, i.e., 25 frames, is one second, as in the case illustrated in Fig. 3. Then, as illustrated in Fig. 6, for example, the speech channel of the first wireless frame in one set and the speech channel of the second wireless frame are mapped as the generation number notification channel 100. However, it is sufficient that there is at least one speech channel mapped as the generation number notification channel 100 in one wireless frame.

[0068] When a call state in which a voice signal is being transmitted is established, the call channel is not mapped as a generation number notification channel, but is mapped as a call channel with voice information assigned to all 25 frames.

[0069] Depending on the configuration of the radio frame format, it may be possible to transmit control information such as generation number notification and voice information simultaneously. However, for the sake of convenience in the explanation of this embodiment, it is assumed that a generation number notification channel and a call channel to which voice information is assigned cannot be transmitted simultaneously on one call channel.

[0070] The generation number notification channel is a channel that notifies the generation number of the broadcast information on the speech channel. The terminal radio device 30 judges whether the broadcast information held in the terminal radio device 30 is the latest or not based on the generation number in the generation number notification channel. Then, the terminal radio device 30 judges whether or not it is necessary to receive the broadcast information.

[0071] Next, the battery saving operation of the terminal radio device 30 will be described with reference to Fig. 6. Generally, the terminal radio device 30 enters a battery saving mode when there is no longer a signal to be received, and maintains the battery saving state for a certain period of time.

[0072] After the above-mentioned certain time has elapsed, that is, after the period of the intermittent reception has elapsed in Fig. 6, the terminal radio device 30 releases the saving state. Note that in Fig. 6, the period of the intermittent reception corresponds to two sets of radio frames, that is, 50 frames.

[0073] Furthermore, if the generation number has not changed at this point, the terminal radio device 30 goes into saving mode again, thereby making the battery last longer.

[0074] The longer the saving state time, the greater the saving effect will be, but the slower the acquisition of notification information will be.

[0075] Next, a description will be given of the operation of the terminal radio device 30 when there is a change in the broadcast information. The terminal radio device 30, which periodically repeats the saving state, cancels the saving state when the generation number notification channel mapped to the speech channel is transmitted.

[0076] Next, the terminal radio device 30 acquires the generation number of the broadcast information from the generation number notification channel. Then, the terminal radio device 30 compares the generation number held in the terminal radio device 30 with the generation number of the generation number channel to determine whether the broadcast information held in the terminal radio device 30 is the latest or not.

[0077] 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. Then, the monitor control unit 34E of the terminal radio device 30 changes the reception slot from the traffic channel to the control channel. That is, as exemplified by the radio frame group 1003 in Fig. 6, the broadcast information of the control channel is acquired from the next radio frame.

[0078] After the terminal radio device 30 receives new broadcast information, specifically, one period of broadcast information, it again enters the saving state until the remaining period of the intermittent reception has elapsed. Note that in FIG. 6, one period of broadcast information is described as one set.

[0079] Next, a description will be given of the operation of the terminal radio device 30 when there is no change in the broadcast information. The terminal radio device 30 acquires the generation number of the broadcast information from the generation number notification channel mapped to the speech channel.

[0080] 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 enters the saving state again from the next radio frame, as exemplified by the radio frame group 1002 in Fig. 6. Then, if there is no call, the terminal radio device 30 remains in the saving state until the remaining intermittent reception period has elapsed.

[0081] Next, the operation of the headquarters device 10 will be described with reference to Fig. 7. Here, Fig. 7 is a flow chart illustrating the operation of the headquarters device according to this embodiment.

[0082] First, the headquarters device 10 determines whether or not an upstream voice signal has been received from the terminal radio device 30 (see step ST01).

[0083] When an upstream voice signal is received, the headquarters device 10 maps the voice information in the received voice signal to a communication channel. Then, the headquarters device 10 transmits the voice information mapped to the communication channel back to the terminal radio device 30 (see step ST02). Then, the process ends.

[0084] On the other hand, if no upstream voice signal is received, the headquarters device 10 determines whether there is any broadcast information to be updated (see step ST03). If there is any 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 proceeds to step ST05. Here, the broadcast information to be updated is, for example, carrier information, i.e., carrier frequency information, transmission / reception slot information, communication system information, etc.

[0085] Next, the headquarters device 10 maps the generation number to a communication channel (see step ST05). If the generation number of the broadcast information is updated in step ST04, the headquarters device 10 maps the updated generation number to a communication channel. Then, the headquarters device 10 transmits the information to the terminal radio device 30.

[0086] Next, the operation of the terminal radio device 30 will be described with reference to Fig. 8. Here, Fig. 8 is a flow chart illustrating the operation of the terminal radio device according to this embodiment.

[0087] First, the terminal radio device 30 receives a speech channel and analyzes information contained in the speech channel (see step ST101). Next, the terminal radio device 30 determines whether or not voice information is mapped to the received speech channel (see step ST102).

[0088] If the voice information is mapped to the received call channel, the terminal radio device 30 performs voice processing. Then, the terminal radio device 30 outputs a voice signal via the voice interface unit 34H (see step ST103).

[0089] On the other hand, if voice information is not mapped to the received communication channel, the terminal radio device 30 determines whether the generation number mapped to the received communication channel has been updated or not (see step ST104).

[0090] When the generation number of the broadcast information is updated, the monitor control unit 34E of the terminal radio device 30 changes the receiving channel in the downlink from the speech channel to the control channel. Then, the terminal radio device 30 acquires the broadcast information again (see step ST106). By doing so, it is possible to respond to the system change.

[0091] On the other hand, if the generation number of the broadcast information has not been updated, the terminal radio device 30 continues to operate in the saving state (see step ST105).

[0092] By the operation of this embodiment described above, for example, the following effects can be obtained.

[0093] The headquarters device 10 manages the update of the generation number of the broadcast information. When the headquarters device 10 updates the broadcast information transmitted on the control channel, the headquarters device 10 maps the generation number to the speech channel.

[0094] When the terminal radio device 30 detects a change in the generation number in the speech channel, it can collect report information from the control channel.

[0095] This configuration can reduce the load of the reception operation on the terminal radio device 30. Also, it is possible to optimize the acquisition of broadcast information and battery saving.

[0096] By mapping the generation number notification information, i.e., the generation number notification channel, in the communication channel mapping area, the terminal radio device 30 can receive at least the communication channel mapping area and thereby receive a return signal of a voice signal from another terminal radio device 30. At the same time, the terminal radio device 30 can also know that an update of the notification information has occurred.

[0097] Furthermore, in the mapping area of ​​the generation number notification information, i.e., the mapping area of ​​the generation number notification channel, if downstream voice information is included, the generation number notification information is not mapped, but the speech channel is mapped. This allows the terminal radio device 30 to receive a return signal of a voice signal from another terminal radio device 30 by monitoring the mapping area of ​​the generation number notification information. At the same time, the terminal radio device 30 can also know that an update of the notification information has occurred.

[0098] <Second embodiment> The headquarters device, the terminal wireless device, and the wireless communication system according to the present embodiment will be described. In the following description, the same components as those described in the above embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

[0099] In the first embodiment, the effect of reducing the load of the receiving operation of the terminal radio device 30 and the effect of optimizing the acquisition of the notification information and the battery saving are shown by taking the case where there is no call, i.e., the case where the voice information is not included in the call channel, as an example. In the present embodiment, the case where there is a call, i.e., the case where the voice information is included in the call channel, is further described.

[0100] 9 is a diagram illustrating the relationship between the downlink transmission timing and the battery saving of the terminal radio device in the wireless communication system according to the present embodiment. The timing of the downlink radio frame 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.

[0101] Next, an operation of the wireless communication system according to this embodiment will be described.When a communication channel to which voice information is mapped is received on the downlink, the terminal wireless device 30 releases the saving state.

[0102] The headquarters device 10 continuously transmits a generation number notification channel on the downlink after the call is terminated. That is, the headquarters device 10 assigns a generation number of the notification information to at least one call channel in a wireless communication frame not including voice information, which is transmitted continuously after a wireless communication frame including voice information. The headquarters device 10 continuously assigns the generation number of the notification information to the call channel, regardless of whether the intermittent reception period has elapsed after the call is terminated. Furthermore, the terminal wireless device 30 continuously receives the call channel, which is the generation number notification channel, after the call is terminated, regardless of whether the intermittent reception period has elapsed.

[0103] By doing so, for example, as in the radio frame group 1004 illustrated in FIG. 9, if there is a change in the generation number in the generation number notification channel, the terminal radio device 30 can continuously retrieve the notification information after the call is ended.

[0104] For comparison of the operation, the operation of the wireless communication system in the case where a notification channel is not transmitted after the end of a call as in the wireless frame group 1005 exemplified in FIG. 9 will be referred to.

[0105] 9, the terminal radio device 30 is in a saving state until the period of intermittent reception has elapsed after the end of the call. Therefore, the terminal radio device 30 receives the generation number notification channel at the next timing of canceling the saving state.

[0106] Therefore, the reception of the broadcast information by the terminal radio device 30 is delayed by the time, that is, by one cycle of the intermittent reception.

[0107] Next, the radio frame group 1004 in FIG. 9 and the radio frame group 1005 in FIG. 9 will be compared from the viewpoint of the battery saving effect.

[0108] The number of radio frames received by the terminal radio device 30 is the same for radio frame group 1004 in Fig. 9 and radio frame group 1005 in Fig. 9. However, in radio frame group 1004 in Fig. 9, generation number notification channels can be continuously captured during one cancellation of a saving operation. Therefore, the number of saving operations, i.e., the number of times saving is switched ON / OFF, is less for radio frame group 1004 in Fig. 9 than for radio frame group 1005 in Fig. 9. Therefore, the saving effect is greater for radio frame group 1004 in Fig. 9.

[0109] As described above, by the headquarters device 10 continuously notifying the generation number after the end of a call, the terminal radio device 30 can continuously receive the generation notification number from the start of the call. Also, if there is a change in the generation number in the generation number notification channel, the terminal radio device 30 can retrieve the notification information following the generation notification number.

[0110] This reduces the number of times the saving mode is switched, and also optimizes the acquisition of notification information and battery saving.

[0111] <Third embodiment> The headquarters device, the terminal wireless device, and the wireless communication system according to the present embodiment will be described. In the following description, the same components as those described in the above embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

[0112] In this embodiment, an example of improving battery life will be described.

[0113] 10 is a diagram illustrating a configuration example when the notification information in the control channel is divided into categories. The headquarters device 10 maps the notification 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.

[0114] Next, an operation of the wireless communication system according to this embodiment will be described. Fig. 11 is a diagram illustrating an example of the relationship between downlink transmission timing and battery saving of a terminal wireless device in the wireless communication system according to this embodiment.

[0115] In the radio frame group 1006 of Figure 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.

[0116] Moreover, a radio frame group 1007 in FIG. 11 indicates the reception timing of the speech channel, the generation number notification channel, and the control channel in the case where the generation number notification channel is transmitted after the speech is ended.

[0117] The timing of the radio frame on the downlink transmitted from the headquarters device 10 and the battery saving operation of the terminal radio device 30 are the same as those exemplified in the first embodiment and the second embodiment.

[0118] In this embodiment, a generation number is notified for each category of broadcast information.

[0119] When detecting a change in the generation number in a procedure similar to that exemplified in the first and second embodiments, the terminal radio device 30 receives a control channel to acquire broadcast information.

[0120] The terminal radio device 30 judges whether the generation number for each category in the received generation number notification channel has been updated, and receives a control CH of a radio frame to which the broadcast information of the category that has been judged to have been updated is mapped. FIG. 11 illustrates a case where the broadcast information of category number "1" and category number "2" have been updated. As exemplified by the radio frame group 1007 in FIG. 11, it is possible to determine which radio frame the broadcast information to be acquired again is transmitted in. That is, by determining which category's generation number has been updated, it is possible to determine the radio frame in which the changed broadcast information is transmitted. Therefore, the terminal radio device 30 can identify the type of broadcast information that needs to be updated, that is, the type of broadcast information whose generation number has been changed, and perform a receiving operation in accordance with the timing of the radio frame containing the broadcast information of that type. Then, the terminal radio device 30 can compare the generation number for each type of broadcast information. After taking in the changed broadcast information, the terminal radio device 30 enters a saving state.

[0121] Therefore, the terminal radio device 30 can enter the saving state at the radio frame timing when broadcast information that does not require updating, that is, broadcast information whose generation number has not changed, is transmitted.

[0122] By the above operation, the wireless communication system according to this embodiment can improve the battery life of the terminal wireless device 30.

[0123] <Effects of the above-described embodiment> Next, the effects of the embodiment described above will be illustrated. In the following description, the effects will be described based on the specific configurations exemplified in the embodiment described above, but the effects may be replaced with other specific configurations exemplified in the present specification as long as the same effects are achieved.

[0124] The replacement may be made across a number of embodiments, that is, configurations exemplified in different embodiments may be combined to produce the same effect.

[0125] According to the embodiment described above, the headquarters device includes a management unit that manages the generation number of the notification information, and a communication control unit 12 that controls wireless communication. The communication control unit 12 assigns the notification information to a control channel 120. If the wireless communication frame to be transmitted contains voice information, the communication control unit 12 assigns the voice information to a speech channel 110 in the wireless communication frame. If the wireless communication frame to be transmitted does not contain voice information, the communication control unit 12 assigns the generation number of the notification information to at least one of the speech channels 110 in the wireless communication frame. Here, the management unit corresponds to, for example, the system management unit 14.

[0126] According to such a configuration, it is possible to receive the broadcast information while suppressing the power consumption in the terminal radio device 30. That is, the terminal radio device can respond to the update of the broadcast information by at least monitoring the speech channel 110, and receiving the control channel 120 when a generation number is assigned to the speech channel 110 and the generation number is an updated generation number. Therefore, the operation control in the terminal radio device 30 does not become complicated. Also, since the terminal radio device 30 does not need to constantly monitor the control channel 120, the battery life of the terminal radio device 30 can be improved.

[0127] Note that the other configurations exemplified in this specification other than these configurations may be omitted as appropriate. In other words, as long as at least these configurations are provided, the effects described above can be obtained.

[0128] However, even if at least one of the other configurations exemplified in this specification is appropriately added to the configuration described above, that is, even if another configuration exemplified in this specification that is not described as a configuration described above is added to the configuration described above, the effects described above can be similarly produced.

[0129] According to the embodiment described above, the management unit updates the generation number of the broadcast information when the broadcast information is updated. When the communication control unit 12 does not include voice information in the wireless communication frame to be transmitted, the communication control unit 12 assigns the updated generation number of the broadcast information to at least one of the communication channels 110 in the wireless communication frame. Here, the management unit corresponds to, for example, the system management unit 14. According to such a configuration, the terminal wireless device 30 can respond to the update of the broadcast information by monitoring at least the communication channel 110, and receiving the control channel 120 when a generation number is assigned to the communication channel 110 and the generation number is an updated generation number. Therefore, the operation control in the terminal wireless device 30 is not complicated. Furthermore, since the terminal wireless device 30 does not need to constantly monitor the control channel 120, the battery life of the terminal wireless device 30 can be improved.

[0130] 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 the updated broadcast information. Here, the management unit corresponds to, for example, the system management unit 14. According to such a configuration, the terminal radio device 30 can identify the type of broadcast information that needs to be updated, that is, the type of broadcast information whose generation number has changed, and perform a receiving operation in accordance with the radio frame timing containing the broadcast information of the type. Then, the terminal radio device 30 can compare the generation numbers for each type of broadcast information. Therefore, the terminal radio device 30 can enter a saving state at the radio frame timing when the broadcast information that does not need to be updated, that is, the broadcast information whose generation number has not changed, is transmitted. Therefore, the battery life of the terminal radio device 30 can be improved.

[0131] Furthermore, according to the embodiment described above, the communication control unit 12 assigns a generation number of the notification information to at least one of the communication channels 110 in the wireless communication frame containing voice information and the subsequent wireless communication frame not containing voice information. With this configuration, if there is a change in the generation number, the terminal wireless device 30 can continuously retrieve the notification information after the call ends. This makes it possible to prevent delays in retrieving the notification information by the terminal wireless device 30. Also, since the number of times saving is switched ON / OFF is reduced, the saving effect of the terminal wireless device 30 is improved.

[0132] According to the embodiment described above, the terminal radio device holds the generation number of the broadcast information. The terminal radio device includes at least a receiver 32C for receiving the call channel 110, and a reception controller for controlling the operation of the receiver 32C. When the generation number of the broadcast information is assigned to the call channel 110, the reception controller 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, and when the generation number of the broadcast information held by the terminal radio device 30 differs from the generation number of the broadcast information assigned to the call channel 110, the reception controller causes the receiver 32C to receive the broadcast information assigned to the control channel 120. Here, the reception controller corresponds to, for example, the monitor controller 34E.

[0133] This configuration makes it possible to receive broadcast information while suppressing power consumption in the terminal radio device 30. That is, the terminal radio device monitors at least the speech channel 110, and can respond to updates of the broadcast information by receiving the control channel 120 when a generation number is assigned to the speech channel 110 and the generation number is an updated generation number.

[0134] Note that the other configurations exemplified in this specification other than these configurations may be omitted as appropriate. In other words, as long as at least these configurations are provided, the effects described above can be obtained.

[0135] However, even if at least one of the other configurations exemplified in this specification is appropriately added to the configuration described above, that is, even if another configuration exemplified in this specification that is not described as a configuration described above is added to the configuration described above, the effects described above can be similarly produced.

[0136] Furthermore, according to the embodiment described above, when an updated generation number of the broadcast information is assigned to the speech channel 110, the reception control unit causes the reception unit 32C to receive the broadcast information assigned to the control channel 120. Here, the reception control unit corresponds to, for example, the monitoring control unit 34E. According to such a configuration, the terminal radio device 30 can respond to the update of the broadcast information by at least monitoring the speech channel 110, and receiving the control channel 120 when a generation number is assigned to the speech channel 110 and the generation number is an updated generation number. Therefore, the operation control in the terminal radio device 30 does not become complicated. Also, since the terminal radio device 30 does not need to constantly monitor the control channel 120, the battery life of the terminal radio device 30 can be improved.

[0137] According to the embodiment described above, the broadcast information is classified into a plurality of types. When the generation number of the broadcast information is assigned to the communication 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 communication channel 110 for each type of broadcast information. Here, the reception control unit corresponds to, for example, the monitoring control unit 34E. According to such a configuration, the terminal radio device 30 can identify the type of broadcast information that needs to be updated, that is, the type of broadcast information whose generation number has changed, and perform a receiving operation in accordance with the radio frame timing containing the broadcast information of the type. Then, after capturing the broadcast information, the terminal radio device 30 can enter a saving state. Therefore, the terminal radio device 30 can enter a saving state at the radio frame timing at which the broadcast information that does not need to be updated, that is, the broadcast information whose generation number has not changed, is transmitted, and therefore the battery life of the terminal radio device 30 can be improved.

[0138] According to the embodiment described above, in the wireless communication system, the terminal wireless device 30 holds a generation number of the broadcast information. The headquarters device 10 includes a management unit that manages the generation number of the broadcast information, and a communication control unit 12 that controls wireless communication. The communication control unit 12 assigns the broadcast information to a control channel 120. When the wireless communication frame to be transmitted includes voice information, the communication control unit 12 assigns the voice information to a call channel 110 in the wireless communication frame. When the wireless communication frame to be transmitted does not include voice information, the communication control unit 12 assigns the generation number of the broadcast information to at least one of the call channels 110 in the wireless communication frame. The terminal wireless device 30 includes at least a receiver 32C that receives the call channel 110, and a receiver control unit that controls the operation of the receiver 32C. When the generation number of the broadcast information is assigned to the speech 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 speech channel 110, and when the generation number of the broadcast information held by the terminal radio device 30 differs from the generation number of the broadcast information assigned to the speech channel 110, the reception control unit causes the reception unit 32C to receive the broadcast information assigned to the control channel 120. Here, the management unit corresponds to, for example, the system management unit 14. Moreover, the reception control unit corresponds to, for example, the monitoring control unit 34E. With this configuration, the broadcast information can be received while suppressing the power consumption in the terminal radio device 30. That is, the terminal radio device 30 at least monitors the speech channel 110, and can respond to the update of the broadcast information by receiving the control channel 120 when a generation number is assigned to the speech channel 110 and the generation number is an updated generation number.

[0139] <Modifications of the above-described embodiments> In the embodiments described above, the dimensions, shapes, relative positional relationships, and implementation conditions of each component may be described, but these are examples in all respects and are not limited to those described in the present specification.

[0140] Therefore, countless modifications and equivalents not illustrated are assumed within the scope of the technology disclosed in the present specification, including, for example, modifying, adding, or omitting at least one component, and further, extracting at least one component in at least one embodiment and combining it with a component in another embodiment.

[0141] Furthermore, unless a contradiction arises, any component described in the above embodiments as being provided in "one" unit may be provided in "one or more" units.

[0142] Furthermore, each component in the embodiments described above is a conceptual unit, and the scope of the technology disclosed in this specification includes cases where one component is made up of multiple structures, where one component corresponds to a part of a structure, and even where multiple components are provided in one structure.

[0143] Furthermore, each of the components in the embodiments described above includes structures having other structures or shapes as long as they perform the same function.

[0144] Furthermore, the descriptions in this specification are incorporated by reference for all purposes relating to the present technology, and none of them are admitted to be prior art.

[0145] Furthermore, each of the components described in the above embodiments is envisioned as either software or firmware, or as corresponding hardware, and in both concepts, each component is referred to as a "unit" or a "processing circuit", etc. [Explanation of symbols]

[0146] 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 transmission unit, 32C reception unit, 32D antenna, 34 control unit, 34A modulation unit, 34B demodulation unit, 34C channel CODE unit, 34D channel DECODE unit, 34E monitoring control unit, 34F operation display unit, 34G voice processing unit, 34H voice interface unit, 100 generation number notification channel, 110 speech channel, 120 control channel, 200, 210, 300 area, 1000, 1001, 1002, 1003, 1004, 1005, 1006, 1007 radio frame group.

Claims

1. A base station connected to the headquarters device, and a terminal wireless device wirelessly communicating with the base station device, A communication system for communicating using slots, frames each consisting of a plurality of said slots, and sets each consisting of a plurality of said frames, wherein a traffic channel or a control channel is mapped to each of said slots, The headquarters device includes: Managing a generation number which is a number that is changed with the update of the broadcast information mapped to the control channel; The terminal wireless device maintaining said generation number; The headquarters device includes: Mapping the broadcast information onto the control channel; When a call state in which a voice signal is transmitted is established, voice information is mapped to the call channel; if no voice information is present, mapping the generation number to the speech channels of two consecutive frames in the set, and not mapping either the generation number or the voice information to speech channels included in the remaining frames of the set; The base station device, If the voice information exists, transmitting a speech channel to which the voice information is mapped; When the voice information is not present, transmitting a traffic channel in which the generation number is mapped to two consecutive frames in the set, and transmitting a traffic channel in which neither the generation number nor the voice information is mapped to the remaining frames in the set; transmitting the control channel onto which the broadcast information is mapped to the terminal wireless device; The terminal wireless device If voice information is mapped to the received speech channel, voice processing is performed; The generation number is mapped to the received communication channel, receiving the broadcast information mapped to the control channel transmitted from the base station device when the generation number held by the terminal wireless device is different from the generation number mapped to the received communication channel; Communication systems.

2. A base station connected to the headquarters device, and a terminal wireless device wirelessly communicating with the base station device, The terminal wireless device is used in a communication system that communicates using slots, frames each consisting of a plurality of the slots, and sets each consisting of a plurality of the frames, and in which a traffic channel or a control channel is mapped to each of the slots, A generation number is stored as a number that is changed with the update of the broadcast information mapped to the control channel; receiving the traffic channel included in two consecutive frames in the set and to which the generation number is mapped; receiving the broadcast information mapped to the control channel transmitted from the base station device when the generation number held by the terminal wireless device is different from the generation number mapped to the received communication channel; Terminal radio equipment.

3. If voice information is mapped to the received speech channel, voice processing is performed.

3. The terminal radio device according to claim 2.

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