JP2010226614A - Mobile station device and wireless communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile station device and wireless communication method which can recognize an incoming voice call to own station during packet communication, even if there is only one radio set. <P>SOLUTION: A dual terminal 16 uses one radio set 22, to perform wireless communication with either an XGP (extended global platform) base station corresponding to packet communication or a PHS (personal handy-phone system)base station, corresponding to voice communication with a single timing. The dual terminal 16 includes a slot release section 42 for intermittently releasing a time slot allocated to the packet communication with the XGP base station; and a CCH (control channel) search section 32 which causes the radio set 22 to attempt reception of a control channel transmitted from the PHS base station, within a predetermined period (20-frame period) with the time slot being released by the slot release section 42. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a mobile station apparatus and a radio communication method, and more particularly to a mobile station apparatus and a radio communication method compatible with both packet communication and voice communication.

  In recent years, mobile stations compatible with both packet communication and voice communication have been provided.

  In addition, currently, PHS (Personal Handy-phone System, see Non-Patent Document 1) adopting TDMA / TDD (Time Division Multiple Access / Time Division Duplex) method, OFDMA (Orthogonal Frequency). The introduction of mobile stations that are compatible with both XGP (eXtended Global Platform, see Non-Patent Document 2) that employs the Division Multiple Access (Orthogonal Frequency Division Multiple Access) system and the TDMA / TDD system is being studied. In this mobile station, it is assumed that XGP is used for packet communication and PHS is used for voice communication.

“RCR STD-28“ Second Generation Cordless Telephone System ”5.3”, September 25, 2008, Japan Radio Industry Association “ARIB STD-T95“ OFDMA / TDMA TDD Broadband Wireless Access System ARIB STANDARD ”Version 1.0”, December 12, 2007, Japan Radio Industry Association

  However, a mobile station that supports both packet communication and voice communication with a single wireless device may not be able to recognize incoming voice calls addressed to itself during packet communication.

  For example, in order for a PHS terminal (PHS compatible mobile station) to receive a control channel (Control Channel: CCH) transmitted at a predetermined period from a PHS base station (PHS compatible base station), the transmission timing of the control channel Must be specified in advance. In particular, PHS stipulates that a control channel is transmitted in one of 80 downlink time slots (4 downlink time slots × 20 frames) included in 20 consecutive frames. For this reason, the PHS terminal must search for 80 downlink time slots in order to specify the transmission timing of the control channel transmitted from the PHS base station located in the vicinity thereof.

  However, a mobile station that supports both XGP and PHS with a single wireless device has only one of packet communication with an XGP base station (XGP compatible base station) and voice communication with a PHS base station at one timing. Since this is not possible, the PHS control channel cannot be searched during packet communication. For this reason, if the mobile station crosses the PHS general call area during packet communication, the mobile station cannot perform location registration in the destination general call area, and as a result, receives incoming call information addressed to itself. Can not even. That is, such a mobile station may not be able to interrupt incoming voice calls while connected to the Internet, such as a smartphone.

  An object of the present invention is to provide a mobile station apparatus and a wireless communication method capable of recognizing an incoming voice call addressed to the own station during packet communication even if there is only one wireless device.

  In order to solve the above-described problems, a mobile station apparatus according to the present invention uses a single radio device to provide a first base station apparatus that supports packet communication at a single timing and a second base that supports voice communication. A mobile station apparatus that performs radio communication with any one of the station apparatuses, the slot release means for intermittently releasing time slots assigned to packet communication with the first base station apparatus, and the slot release means Control channel receiving means for attempting to receive a control channel transmitted from the second base station apparatus at a predetermined period in the time slot released by the above-mentioned feature.

  According to the present invention, the mobile station apparatus intermittently releases the time slot assigned to the packet communication with the first base station apparatus, while the second base corresponding to the voice communication using the released time slot. Attempts to receive a control channel transmitted from the station apparatus. For this reason, the mobile station apparatus can recognize an incoming voice call addressed to itself during packet communication even if there is only one radio.

  In one aspect of the present invention, the slot releasing means is assigned to packet communication with the first base station apparatus until at least a control channel having a reception level equal to or higher than a predetermined threshold is received by the control channel receiving means. Continue to release intermittent time slots.

  In one aspect of the present invention, the slot releasing means is assigned to packet communication with the first base station apparatus when the control channel receiving means receives a control channel having a reception level equal to or higher than a predetermined threshold. Of the received time slots, only the time slots in which the control channel is received are released at the predetermined period.

  According to this aspect, the time slot allocated to the packet communication has a reduced release time, and a decrease in the throughput of the packet communication can be suppressed.

  In the aspect of the present invention, the mobile station apparatus uses packet communication with the first base station apparatus when the control channel receiving unit receives a control channel having a reception level equal to or higher than a predetermined threshold. And a location registration means for performing location registration of the mobile station device related to voice communication with the second base station device.

  According to this aspect, since location registration related to voice communication is performed via the first base station device to which the mobile station device is wirelessly connected, time required for location registration of the mobile station device can be shortened. .

  Further, in one aspect of the present invention, the control channel receiving unit receives a control channel having a reception level equal to or higher than a predetermined threshold, and the control channel including incoming call information from the second base station apparatus is provided. If received, the mobile station apparatus releases all the time slots allocated for packet communication with the first base station apparatus, and the second base station in any of the released time slots. Perform voice communication with the station equipment.

  The slot releasing means releases the time slot allocated for packet communication with the first base station apparatus to the first base station apparatus a predetermined time before the time slot. A time slot release may be requested.

  In addition, the wireless communication method according to the present invention uses either one wireless device and one of the first base station device corresponding to packet communication and the second base station device corresponding to voice communication at one timing. Is a wireless communication method of a mobile station apparatus that performs wireless communication with a slot release step of intermittently releasing time slots assigned to packet communication with the first base station apparatus, and release in the slot release step And attempting to receive a control channel transmitted from the second base station apparatus at a predetermined cycle in the determined time slot.

It is a figure which shows the structure of the mobile communication system which concerns on embodiment of this invention. It is a figure which shows the channel structure of PHS and the channel structure of XGP. It is a figure which shows the transmission period (20 frames, 100 ms) of a control channel. It is a functional block diagram of the dual terminal which concerns on embodiment of this invention. It is a figure which shows an example of a CCH search timing. It is a figure which shows an example of a CCH search timing. It is a sequence diagram which shows an example of the control channel search process performed during the packet communication of a dual terminal and an XGP base station. It is a sequence diagram which shows an example of the control channel search process performed during the packet communication of a dual terminal and an XGP base station. It is a figure which shows an example of slot allocation. It is a figure which shows an example of slot allocation.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a mobile communication system 10 according to an embodiment of the present invention. As shown in the figure, the mobile communication system 10 includes an XGP base station 12 compatible with XGP employing the OFDMA method and the TDMA / TDD method, a PHS base station 14 compatible with PHS employing the TDMA / TDD method, It includes a dual terminal 16 (mobile station) that supports both XGP and PHS, and a network 18 to which the XGP base station 12 and the PHS base station 14 are connected.

  The dual terminal 16 performs wireless communication with one of the XGP base station 12 and the PHS base station 14 at one timing using one wireless device. In the present embodiment, it is assumed that the dual terminal 16 uses XGP for packet communication and PHS for voice communication.

  FIG. 2 is a diagram illustrating a PHS channel configuration and an XGP channel configuration. As shown in the figure, in PHS and XGP, a TDMA frame (5 ms) is divided into an uplink (uplink) subframe (2.5 ms) and a downlink (downlink) subframe (2.5 ms). Each subframe is equally divided into four time slots (slot # 1 to slot # 4). The PHS frame and the XGP frame are synchronized with each other.

  Also, as shown in FIG. 2, in PHS, only one 1.9 GHz band radio channel can be used for each time slot. On the other hand, in XGP, a plurality of (for example, 18) OFDMA subchannels are defined in the 2.5 GHz band, and one or more subchannels can be used for each time slot. Note that the minimum unit of a radio channel assigned by XGP is called a PRU (Physical Resource Unit) and belongs to one of eight time slots and one of a plurality of subchannels.

  In the mobile communication system 10, the PHS base station 14 transmits the control channel (CCH) once every 20 frames (100 ms), specifically, in any one of 80 downlink time slots included in 20 consecutive frames. It is defined (see FIG. 3). For this reason, the dual terminal 16 and the PHS terminal must search for 80 downlink time slots in order to specify the transmission timing of the control channel transmitted from the PHS base station 14 located in the vicinity thereof.

  As described above, since the dual terminal 16 according to the present embodiment includes only one radio device, any of the XGP base station 12 that supports packet communication and the PHS base station 14 that supports voice communication at one timing. Wireless communication can only be performed with one of them. However, the dual terminal 16 intermittently releases the time slot assigned to the packet communication with the XGP base station 12 and transmits the control channel transmitted from the PHS base station 14 corresponding to the voice communication in the released time slot. Therefore, it is possible to recognize incoming voice calls addressed to the local station even during packet communication.

  Below, the structure with which the dual terminal 16 is provided in order to implement | achieve the said process is demonstrated.

  FIG. 4 is a functional block diagram of the dual terminal 16. As shown in the figure, the dual terminal 16 includes an antenna 20, a radio device 22, a PHS control unit 30 (CCH search unit 32, CCH search schedule control unit 34, CCH information management unit 36), and an XGP control unit 40 (slot A release unit 42 and a PHS position registration unit 44) are included.

  The antenna 20 receives a radio signal and outputs the received radio signal to the radio device 22. The antenna 20 transmits a radio signal supplied from the radio device 22 to the XGP base station 12 or the PHS base station 14.

  The radio device 22 includes a low noise amplifier, a power amplifier, a frequency converter, a band pass filter, an A / D converter, a D / A converter, a demodulator, and a modulator. The radio 22 performs signal processing according to the radio frequency band of PHS or XGP, the modulation method, and the protocol for the radio signal input from the antenna 20, and the obtained reception data is subjected to PHS control unit 30 or XGP control. To the unit 40. The radio device 22 performs signal processing on transmission data input from the PHS control unit 30 or the XGP control unit 40 according to the PHS or XGP protocol, the modulation method, and the radio frequency band, The signal is amplified to the transmission output level and then supplied to the antenna 20.

  The output destination of the reception data output from the wireless device 22 and the input source of the transmission data input to the wireless device 22 are either the XGP base station 12 or the PHS base station 14 when the time slot in which the data is transmitted / received It is switched according to whether it is assigned. That is, the wireless device 22 can perform wireless communication with only one of the XGP base station 12 and the PHS base station 14 in each time slot.

  The PHS control unit 30 is composed of, for example, a DSP (Digital Signal Processor) and a program for controlling the operation of the DSP, and performs various controls related to the PHS protocol based on received data input from the wireless device 22 or a PHS base station. 14 is generated and output to the wireless device 22. The PHS control unit 30 functionally includes a CCH search unit 32, a CCH search schedule control unit 34, and a CCH information management unit 36, and the PHS base station 14 located around the dual terminal 16 transmits a control channel. Identify and manage timing.

  The CCH search unit 32 performs processing related to a search for a control channel transmitted from the PHS base station 14 located around the dual terminal 16. That is, the CCH search unit 32 instructs the radio device 22 to try to receive the control channel at the CCH search timing notified from the CCH search schedule control unit 34 described later. Also, the CCH search unit 32 acquires the control data included in the received control channel and the reception level of the control channel from the radio device 22 and outputs them to the CCH information management unit 36 as a CCH search result.

  The CCH search schedule control unit 34 determines a downlink time slot (CCH search timing) that causes the radio device 22 to try to receive a control channel. In particular, when the dual terminal 16 is performing packet communication with the XGP base station 12, the CCH search schedule control unit 34 distributes the search timing of each of the 80 downlink time slots included in the control channel transmission period (20 frames). Thus, the CCH search timing is determined, and the determined CCH search timing is notified to the CCH search unit 32 and an XGP control unit 40 (slot release unit 42) described later. As a result, the radio device 22 transmits a downlink time slot that is intermittently released by the slot release unit 42 among the time slots assigned to packet communication with the XGP base station 12, and is transmitted from the PHS base station 14 at a cycle of 20 frames. Will be able to attempt to receive the control channel.

  5A and 5B are diagrams illustrating an example of the CCH search timing determined by the CCH search schedule control unit 34. FIG. In the example shown in the figure, the search timing of each of the 80 downlink time slots is distributed almost equally over 80 frames, which is four times 20 frames, so that the same time slot is not subject to the control channel search continuously for two frames or more. ing. For example, the search timing of slot # 1 in the first search (first 20 frames) is frames # 1, # 5, # 9, # 13, and # 17 (frame group # 1), and is set to an interval of 4 frames. Has been. Also, the search timing of slot # 1 in the second search (next 20 frames) is frames # 2, # 6, # 10, # 14, and # 18 (frame group # 2), and at intervals of 4 frames. Is set. This is to prevent a time slot allocated for packet communication with the XGP base station 12 from being continuously released by a plurality of frames (here, two frames) by a slot releasing unit 42 described later.

  Note that the CCH search schedule control unit 34 may determine the CCH search timing by a method different from the above method. For example, the CCH search schedule control unit 34 may determine the CCH search timing using a random number or the like.

  Based on the search result input from the CCH search unit 32, the CCH information management unit 36 selects a target base station to be received by the control channel from one or more PHS base stations 14 located around the dual terminal 16. To decide. Specifically, when a control channel having a reception level equal to or higher than a predetermined threshold is received, the CCH information management unit 36 sets the PHS base station 14 that transmitted the control channel as a target base station. Here, when a control channel having a reception level equal to or higher than a predetermined threshold is not received, the CCH information management unit 36 determines that the PHS base station 14 that has transmitted the control channel having the maximum reception level among the received control channels is a temporary target base station. It is good.

  When the target base station is switched during packet communication with the XGP base station 12 and the dual terminal 16 crosses the general call area, the CCH information management unit 36 uses the packet communication with the XGP base station 12 to switch to PHS. The XGP control unit 40 is instructed to register the location of the dual terminal 16. Thereby, the location registration of the dual terminal 16 can be performed in a short time without disconnecting the wireless connection with the XGP base station 12 or establishing a new wireless connection with the PHS base station 14.

  Further, when the target base station is determined, the CCH information management unit 36 transmits the control channel from the target base station until the reception level of the control channel transmitted from the target base station becomes less than a predetermined threshold. The CCH search schedule control unit 34 may be instructed to set only the time slot as the CCH search timing.

  The XGP control unit 40 is composed of, for example, a DSP and a program for controlling the operation of the DSP, and performs various controls related to the XGP protocol based on the reception data input from the radio device 22 or transmission data addressed to the XGP base station 12 Is generated and output to the wireless device 22. Further, the XGP control unit 40 functionally includes a slot release unit 42 and a PHS position registration unit 44, and the CCH search timing notified from the PHS control unit 30 (CCH search schedule control unit 34), the PHS control unit 30 (CCH Packet communication with the XGP base station 12 is controlled based on the CCH search result acquired by the search unit 32), an instruction from the PHS control unit 30 (CCH information management unit 36), and the like.

  The slot release unit 42 intermittently releases time slots assigned to the packet communication during the packet communication with the XGP base station 12. Specifically, the slot release unit 42 sets the CCH search timing so that the time slot assigned to the packet communication with the XGP base station 12 is released at the CCH search timing notified from the CCH search schedule control unit 34. Request the release of the time slot to the XGP base station 12 a predetermined time before (for example, one frame before (5 ms before)).

  When the target base station is determined by the CCH information management unit 36 (when a control channel having a reception level equal to or higher than a predetermined threshold is received), the slot release unit 42 is assigned to packet communication with the XGP base station 12. Of the time slots, only the time slots in which the control channel is transmitted from the target base station may be released in a cycle of 20 frames. In this way, the time slot release time (unusable time) assigned to packet communication is shortened, and a decrease in packet communication throughput can be suppressed.

  However, the slot release unit 42 performs packet communication with the XGP base station 12 at least until the target base station is determined by the CCH information management unit 36 (at least until a control channel having a reception level equal to or higher than a predetermined threshold is received). It is desirable to continue the intermittent release of assigned time slots.

  When the target base station is switched during packet communication with the XGP base station 12 and the dual terminal 16 straddles the general call area, the PHS location registration unit 44 is based on an instruction from the CCH information management unit 36 and 12 is used to register the location of the dual terminal 16 related to PHS.

  Here, the operation of the dual terminal 16 will be described.

  6A and 6B are sequence diagrams illustrating an example of a control channel search process performed during packet communication between the dual terminal 16 and the XGP base station 12. Here, a case where the dual terminal 16 searches for a control channel in slot # 1 of frames # 1, # 5, # 9, # 13, and # 17 (frame group # 1) will be described. In addition, it is assumed that a total of 18 PRUs belonging to slots # 1, # 2, and # 3 are assigned to packet communication between the dual terminal 16 and the XGP base station 12 (see the thick line frame in FIG. 7A).

  First, the PHS control unit 30 of the dual terminal 16 sets the CCH search timing “slot # 1 of frame # 1” at the timing of slot # 20 (one frame before frame # 1), and the XGP control unit 40 of the dual terminal 16. (S100). Next, the XGP control unit 40 requests the XGP base station 12 to release “slot # 1” notified as the CCH search timing (S102).

  The XGP base station 12 that has received the release request for “slot # 1” from the dual terminal 16 releases the six PRUs of “slot # 1” assigned to the packet communication with the dual terminal 16 and “slot # 1”. Free PRUs (six here) belonging to “4” are newly allocated to packet communication with the dual terminal 16 (see FIG. 7A). Then, the XGP base station 12 notifies the dual terminal 16 of the changed PRU assignment (S104). As a result, in frame # 1, slot # 1 cannot be used for packet communication between the dual terminal 16 and the XGP base station 12.

  When the dual terminal 16 confirms the release of the slot # 1 by the notification in S104, the dual terminal 16 searches for the control channel of the PHS base station 14 in the slot # 1 of the released frame # 1 (see S106, FIG. 7B). Thereafter, the dual terminal 16 requests the XGP base station 12 to allocate the “slot # 1” released by the request in S102 (S108), and receives the changed PRU allocation notification from the XGP base station 12 (S110). .

  When the control channel of the PHS base station 14 is not received in S106, the PHS control unit 30 performs the next CCH search timing “slot # 1 of frame # 5” at the timing of slot # 4 (one frame before frame # 5). "To the XGP control unit 40 (S112). Then, the XGP control unit 40 requests the XGP base station 12 again to release “slot # 1” notified as the CCH search timing (S114).

  The XGP base station 12 that has received the release request of “slot # 1” from the dual terminal 16 releases “slot # 1” assigned to the packet communication with the dual terminal 16 and changes the same as described above. The PRU allocation is notified to the dual terminal 16 (S116). As a result, in frame # 5, slot # 1 cannot be used for packet communication between the dual terminal 16 and the XGP base station 12.

  When the dual terminal 16 confirms the release of the slot # 1 by the notification in S116, the dual terminal 16 searches for the control channel of the PHS base station 14 in the slot # 1 of the released frame # 5 (S118). Thereafter, the dual terminal 16 requests the XGP base station 12 to allocate the “slot # 1” released in the request of S114 (S120), and receives the changed PRU allocation notification from the XGP base station 12 (S122). .

  Thereafter, the same processing as described above is performed for slot # 1 of frames # 9, # 13, and # 17 until the control channel of the PHS base station 14 is received.

  When a control channel having a reception level equal to or higher than a predetermined threshold is received by the search for the control channel, the dual terminal 16 determines the PHS base station 14 that transmitted the control channel as the target base station. Then, the dual terminal 16 monitors only the control channel transmitted from the target base station until the reception level of the control channel transmitted from the target base station becomes less than a predetermined threshold. Here, when a control channel including incoming call information addressed to the local station is received from the target base station, the dual terminal 16 releases all time slots allocated for packet communication with the XGP base station 12 (XGP). After disconnecting the wireless connection with the base station 12, the wireless connection with the target base station is established in one of the released time slots and voice communication is performed.

  According to the embodiment described above, the dual terminal 16 intermittently releases the time slot assigned to the packet communication with the XGP base station 12, while the PHS base station corresponding to the voice communication using the released time slot. Attempt to receive a control channel transmitted from 14. For this reason, the dual terminal 16 can recognize an incoming voice call addressed to itself during packet communication even if there is only one wireless device 22.

  The present invention is not limited to the above embodiment. That is, the present invention is not limited to a mobile station compatible with both PHS and XGP, and uses a single radio to provide a first base station compatible with packet communication at one timing and a second compatible with voice communication. The present invention can be widely applied to mobile stations that perform radio communication with any one of the base stations.

  10 mobile communication systems, 12 XGP base stations, 14 PHS base stations, 16 dual terminals, 18 networks, 20 antennas, 22 radios, 30 PHS control units, 32 CCH search units, 34 CCH search schedule control units, 36 CCH information management Part, 40 XGP control part, 42 slot release part, 44 PHS position registration part.

Claims (7)

A mobile station apparatus that performs wireless communication with one of a first base station apparatus that supports packet communication and a second base station apparatus that supports voice communication at one timing using a single wireless device. ,
Slot release means for intermittently releasing time slots assigned to packet communication with the first base station device;
Control channel receiving means for attempting to receive a control channel transmitted from the second base station apparatus at a predetermined period in the time slot released by the slot releasing means;
A mobile station apparatus comprising: In the mobile station apparatus of Claim 1,
The slot releasing means intermittently releases time slots assigned to packet communication with the first base station apparatus until at least the control channel receiving means receives a control channel having a reception level equal to or higher than a predetermined threshold. Continue,
A mobile station apparatus. In the mobile station apparatus of Claim 1 or 2,
The slot release means, when the control channel receiving means receives a control channel having a reception level equal to or higher than a predetermined threshold, the control channel among the time slots assigned to packet communication with the first base station apparatus. Only the time slots in which the message is received are released in the predetermined period,
A mobile station apparatus. In the mobile station apparatus in any one of Claim 1 to 3,
When the control channel receiving means receives a control channel having a reception level equal to or higher than a predetermined threshold, the packet communication with the first base station apparatus is used for voice communication with the second base station apparatus using the packet communication with the first base station apparatus. It further includes location registration means for performing location registration of the mobile station device,
A mobile station apparatus. In the mobile station apparatus in any one of Claim 1 to 4,
When the control channel receiving means receives a control channel having a reception level equal to or higher than a predetermined threshold value and receives a control channel including incoming call information from the second base station apparatus, Release all time slots allocated for packet communication with one base station apparatus, and perform voice communication with the second base station apparatus in any of the released time slots;
A mobile station apparatus. In the mobile station apparatus in any one of Claim 1 to 5,
The slot releasing means releases the time slot assigned to the first base station apparatus a predetermined time before the time slot in order to release a time slot allocated for packet communication with the first base station apparatus. Requesting the release of
A mobile station apparatus. Radio communication of a mobile station apparatus that performs radio communication with one of the first base station apparatus that supports packet communication and the second base station apparatus that supports voice communication at one timing using one radio device A method,
A slot release step for intermittently releasing time slots assigned to packet communication with the first base station device;
Attempting to receive a control channel transmitted from the second base station apparatus at a predetermined period in the time slot released in the slot releasing step;
A wireless communication method comprising:

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