JP2019062251A - Radio communication system, relay device, and radio communication terminal - Google Patents

Abstract

To propose techniques capable of avoiding voice cutoff of the head (beginning) of speech and collision of transmission rights.SOLUTION: A radio communication system includes a base station, a plurality of mobile stations, and a relay station. The relay station includes a via-base-station radio device for performing group communication with the base station and a direct communication radio device for performing group communication with the mobile stations in an area where the base station cannot offer communication services. The direct communication radio device manages transmission rights of the mobile stations.SELECTED DRAWING: Figure 7

Description

  The present invention relates to wireless communication systems, and more particularly to group communication.

  In the digital wireless communication system, ARIB STD-T79 standard has been proposed as a TDMA system. This wireless communication system is a disaster prevention wireless communication system, and there are two types of communication schemes: base station communication for communicating via a base station, and direct communication between mobile stations not via a base station. Also, a relay station (direct communication relay station) is provided as a wireless device for connecting a terminal (mobile station) in a base station communication area in base station communication and a terminal (mobile station) in a direct communication area in direct communication between mobile stations. ) Is provided.

  FIG. 1 shows the configuration of a wireless communication system. The wireless communication system includes a base station BSA, a plurality of mobile stations T1 and T2 in the communication area of the base station BSA, and the relay station 1A, and the relay station 1A passes through the base station for performing group communication with the base station BSA. Connect dedicated device 10A, direct communication dedicated device 20A for performing group communication with communication mobile stations A and A2 directly in the area where base station BSA is out of communication area, and dedicated device 10A via base station and direct communication dedicated device 20A Equipped with a dedicated cable CA1. The radio communication system is also provided with a base station BSB, and the base station BSB is connected to the base station BSA via a line controller C. The base station BSB has a plurality of mobile stations T3 and T4 and a relay station 1B in the communication area of the base station BSB, and the relay station 1B and the dedicated apparatus 10B via the base station for performing group communication with the base station BSB. A dedicated cable CA2 for directly connecting a dedicated dedicated communication device 20B for performing group communications with the communications mobile stations B and B2 directly in an area where the base station BSB is out of communication area, and a dedicated dedicated communication device 20B with a dedicated base station via 10B. Is equipped.

  FIG. 2 is a diagram for explaining the communication state of group communication when the direct communication mobile station A directly communicates with the communication mobile station B in FIG.

  When the direct communication mobile station A communicates with the direct communication mobile station B, the direct communication mobile station A directly communicates via the relay station 1A, the base station BSA, the channel controller C, the base station BSB and the relay station 1B. Communicate with station B

  First, the direct communication mobile station A transmits the voice over the traffic channel TCH after transmitting the synchronization burst (SB) a prescribed number of times, for example, 5 times, to the relay station 1A for the synchronization probability. The relay station 1A sends an utterance request SB2 to the base station BSA, and the base station BSA sends an utterance approval SB3 to the relay station 1A with respect to the utterance request SB2. The base station BSA sends the speech acknowledgement SB4 in response to the reception of the speech acknowledgement SB3, and the base station BSA sends the traffic channel TCH to the relay station 1A to establish synchronization. After that, the relay station 1A sends voice to the base station BSA on the traffic channel TCH. The traffic channel TCH transmitted from the relay station 1A is sent to the line controller C and the base station BSB. The base station BSB transmits a traffic channel TCH (B / I = I) indicating idle and a traffic channel TCH (B / I = B) indicating busy to the relay station 1B. The relay station 1B then transmits synchronization bursts (SB) directly to the communication mobile station B a prescribed number of times, for example, five times, for establishing synchronization with the direct communication mobile station B, and thereafter, transmits voice over the traffic channel TCH. Directly send to mobile communication station B.

Thus, when the direct communication mobile station A communicates with the direct communication mobile station B, the following delay occurs as shown in the figure.
1: Processing delay of relay station 1A.
2: Delay for establishing synchronization between relay station 1A and base station BSA.
3: Infrastructure delay by the line control device C.
4: Processing delay of relay station 1B.
5: Delay for establishing synchronization between relay station 1 B and direct communication mobile station B.

  Therefore, when the terminal in the direct communication area (mobile station A) acquires the transmission right, there is a delay before each device recognizes the acquisition of the transmission right, so the voice at the beginning of the call is cut off. There's a problem.

  FIG. 3 is a diagram for explaining the communication state of the group communication when the base communication mobile station T3 first obtains the transmission right when the direct communication mobile station A tries to obtain the transmission right in FIG. It is.

  First, the base communication mobile station T3 exchanges a speech request SB2, speech recognition SB3, speech recognition SB4 and traffic channel TCH with the base station BSB to acquire the transmission right, and thereafter, moves the base communication mobile station. Station T3 sends voice over the traffic channel TCH to the base station BSB. The traffic channel TCH generated by the base communication mobile station T3 is transmitted to the channel control device C, the base station BSA, and the base-side mobile station A. On the other hand, the direct side mobile station A similarly transmits voice to the direct side mobile station A2 and the relay station 1A after transmitting the synchronization burst (SB) a prescribed number of times, for example, five times, for establishing synchronization. Send by traffic channel TCH.

  In this case, since the base-side mobile station T3 has already acquired the transmission right, the relay station BSA can not acquire the transmission right. As a result, the voice of the direct side mobile station A will not reach the base side (base side mobile station T1). In addition, since the direct mobile station A can not determine whether it has acquired the transmission right, it continues to transmit. As a result, the voice of the base-side mobile station A does not reach the direct side (direct communication mobile station A2). Furthermore, the voice of the base station BSB also does not reach the direct communication mobile station A and the direct communication mobile station A2 under the control of the relay station 1A.

  Therefore, when the mobile station of direct communication tries to acquire the transmission right, if the mobile station of base communication acquires the transmission right first, each of them will be in a state of transmitting. Therefore, there is a problem that a place where the call can not be heard may come out.

  As a proposal regarding the relay station of a radio | wireless communications system, there exists Unexamined-Japanese-Patent No. 2010-114741 (patent document 1), for example.

Unexamined-Japanese-Patent No. 2010-114741

An object of the present disclosure is to propose a technology capable of avoiding a collision of a voice at the beginning of a call (first) and a right of transmission.
Other problems and novel features will be apparent from the description of the present specification and the accompanying drawings.

The outline of typical ones of the present disclosure will be briefly described as follows.
That is, the wireless communication system includes a base station, a plurality of mobile stations, and a relay station. The relay station includes a base station via radio for performing group communication with the base station, and a direct communication radio for performing group communication with the mobile station in an area where the base station is out of communication area. . The direct communication radio manages the transmission right of the mobile station.

  According to the above, by managing the transmission right of the mobile station under the control of the base station via the base station, it is possible to avoid the voice disconnection of the head of the call (first) and the collision of the transmission right.

It is a figure which shows the structure of a radio | wireless communications system. FIG. 2 is a diagram for explaining a communication state of group communication when direct communication mobile station A directly communicates with communication mobile station B in FIG. FIG. 2 is a diagram for explaining a communication state of group communication when base communication mobile station 3 first obtains a transmission right when direct communication mobile station A tries to obtain a transmission right. It is a figure for demonstrating the radio | wireless communications system which concerns on an Example. It is a figure for demonstrating the structure of the relay station which concerns on an Example. FIG. 7 is a diagram for explaining a communication mode of the direct communication mobile station in the communication area 50. FIG. 16 is a diagram for explaining another communication mode of the direct communication mobile station in the communication area 50. It is a figure for demonstrating the structure of the direct communication mobile station which concerns on an Example. It is a figure explaining the composition of the communication frame of the direct communication exclusive use machine and the direct communication mobile station concerning an example. It is a timing chart which shows a call of a direct communication mobile station concerning an example. It is a timing chart which shows a call of a mobile station by the side of a base station concerning an example. It is a timing chart when a direct communication mobile station concerning an example succeeds in acquisition of a transmission right. It is a timing chart when a direct communication mobile station concerning an example fails in acquisition of a transmission right. It is a timing chart when a mobile station by the side of a base station concerning an example succeeds in acquisition of a transmission right.

  Hereinafter, examples will be described using the drawings. However, in the following description, the same components may be assigned the same reference numerals and repeated descriptions may be omitted. In addition, although drawing may be represented typically compared with an actual aspect, in order to clarify description, it is an example to the last, and does not limit interpretation of this invention.

(Wireless communication system)
FIG. 4 is a diagram for explaining a wireless communication system according to an embodiment. FIG. 5 is a diagram for explaining the configuration of the relay station.

  The communication system 100 is a disaster prevention wireless communication system, and includes a first base station BS1, a second base station BS2, a channel control device 60 for connecting the first base station BS1 and the second base station BS2, and a channel control device. And 60. A communication console 70 connected to 60.

  The wireless communication system 100 includes a base station BS1, a plurality of mobile stations 101 and 102 in a communication area 40 of the base station BS1, and a relay station (or relay apparatus) 1. The relay station 1 directly communicates with the base station BS1 in a communication area 50 in the area where the base station BS1 is out of communication area (wireless communication) (base station via radio (base station via radio) 10 for performing group communication with the base station BS1. Terminals 201 and 202 and a direct communication dedicated device (direct communication wireless device) 20 for performing group communication. In the relay station 1, the base station via dedicated machine 10 and the direct communication dedicated machine 20 are connected by a dedicated cable 11. The communication area 50 is, for example, a mountainous area.

  The wireless communication system 100 also includes a base station BS2, a plurality of mobile stations 101b and 102b in a communication area 40b of the base station BS2, and a relay station (or relay apparatus) 1b. The relay station 1b is a dedicated base station 10b for performing group communication with the base station BS2, and the communication mobile stations (wireless communication terminals) 201b and 202b and the group directly in the communication area 50b of the area where the base station BS2 is out of communication area. And a direct communication dedicated device 20b for performing communication. In the relay station 1b, the base station via dedicated machine 10b and the direct communication dedicated machine 20b are connected by a dedicated cable 11b. The direct communication dedicated device 20 (20b) has a function of managing the transmission right of group communication of the direct communication mobile stations 201 and 202 (201b and 202b) under the direct communication dedicated device 20 (20b).

  The base station BS1 communicates with the relay stations 1 with the mobile stations 101 and 102 within the base station area, which is the communicable area 40 of the base station BS1. The relay station 1 relays communication with the base station BS1 to the mobile stations 201 and 202 in the dead zone (communication area 50) outside the base station area 40.

  The base station BS2 communicates with the mobile stations 101b and 102b and the relay station 1b in an area within the range of the base station which is the communicable area 40b of the base station BS2. The relay station 1b relays communication with the base station BS2 to the mobile stations 201b and 202b in the dead zone (communication area 50b) outside the base station area 40.

  The mobile stations 201 and 202 in the blind area (communication area 50) communicate with the mobile stations 101 and 102 in the base station within-area 40 using direct communication via the relay station 1 and the base station BS1. That is, mobile stations 201 and 202 in the dead zone (communication area 50) are mobile stations 101 in the area 40 within the base station area 40 via the direct communication dedicated device 20, the base station via dedicated device 10, and the base station BS1. It can communicate with 102. Conversely, mobile stations 101 and 102 in base station coverage area 40 are mobile stations 201 in dead area (communication area 50) via base station BS1, dedicated device 10 via base station, and direct communication dedicated device 20. , 202 can communicate.

  The mobile stations 201b and 202b in the dead zone (communication area 50b) communicate with the mobile stations 101b and 102b in the base station within-area 40b using direct communication via the relay station 1b and the base station BS2. That is, the mobile stations 201b and 202b in the dead zone (communication area 50b) are the mobile station 101b in the base station area 40b via the direct communication dedicated device 20b, the base station relay dedicated device 10b, and the base station BS2, It can communicate with 102b. Conversely, mobile stations 101b and 102b in base station coverage area 40b are mobile stations 201b in the dead zone (communication area 50b) via base station BS2, base station via dedicated station 10b, and direct communication dedicated machine 20b. , 202b.

  The mobile stations 201 and 202 in the blind area (communication area 50) are the direct communication dedicated unit 20, the base unit via dedicated unit 10, the base station BS1, the line control device 60, the base station BS2, the dedicated via terminal 10b And, it is possible to communicate with the mobile stations 201b and 202b in the dead area (communication area 50b) via the direct communication dedicated device 20b. Conversely, mobile stations 201b and 202b in the dead zone (communication area 50b) are direct communication dedicated devices 20b, base station via dedicated devices 10b, base station BS2, channel control apparatus 60, base station BS1, base station via dedicated devices It is possible to communicate with the mobile stations 201 and 202 within the dead area (communication area 50) through 10 and the direct communication dedicated device 20.

  In the communication area 40 (40b), for example, the frequency f0 (f0b) is used for transmission from the base station BS1 (BS2) to the mobile stations 101 and 102 (101b and 102b) and the base station via dedicated machine 10 (10b). It is considered as communication. Transmission from the mobile stations 101 and 102 (101b and 102b) and the base station via dedicated machine 10 (10b) to the base station BS1 (BS2) is, for example, communication using the frequency f1 (f1b).

  On the other hand, in the communication area 50 (50b), transmission and reception between the direct communication dedicated device 20 (20b) and the mobile stations 201, 202 (201b, 202b) are, for example, communication using the same frequency f2 Ru. In order to use the same frequency f2 for transmission and reception, transmission from the dedicated communication device 20 (20b) to the mobile stations 201, 202 (201b, 202b) and from the mobile station (201, 202) to the dedicated communication device 20 directly Reception is performed in a separate time zone.

(Configuration of relay station)
Next, the configuration of the relay station 1 will be described using FIG. 5, but the relay station 1 b also has the same configuration as the relay station 1. Therefore, the description of the configuration of the relay station 1b is omitted.

  As shown in FIG. 5, the relay station 1 has a configuration in which two mobile stations (10, 20) are connected by a dedicated cable 11, and each mobile station (10, 20) is connected to a dedicated device 10 via a base station. And a direct communication dedicated machine 20. The dedicated cable 11 comprises a dedicated cable 11a for transmitting a control signal and a dedicated cable 11b for transmitting audio data. When the mobile station 101 originates a call in a group registered in the relay station 1, the base station via dedicated machine 10 receives a group call from the mobile station 101, and at the same time, the control unit 13 of the base station via dedicated machine 10 The group number received by the dedicated device 10 via the base station is transmitted directly to the control unit 23 of the dedicated communication device 20 by serial communication using the dedicated cable 11a, and the direct communication device 20 transmits the group number. The mobile station 201 and the mobile station 102 receive calls originating from the direct communication dedicated machine 20 and the call is established. The antenna AN 10 of the base station via dedicated machine 10 is connected to the transmitter 11 and the receiver 12. The antenna AN 20 of the direct communication dedicated device 20 is connected to the transmitting unit 21 and the receiving unit 22. The relay station 1 may be able to transmit from either the base station via dedicated station 10 or the direct communication dedicated machine 20.

  The transmission from the mobile station 101 is received by the receiving unit 12 of the dedicated via-station 10 via the base station BS1, and is output to the control unit 13. When the control unit 13 determines that the mobile station 101 is transmitting data, the control unit 13 outputs voice to the relay unit 14. The relay unit 14 of the dedicated base station via the base station 10 transmits it directly to the relay unit 24 of the dedicated communication terminal 10 by serial transmission of the dedicated cable 11b, and the mobile unit 201 and the mobile station 201 in the blind area from the relay unit 24 through the control unit 23 It is transmitted to the station 202.

  Transmission from the mobile station 201 is received by the reception unit 22 of the direct communication dedicated device 20 and output to the control unit 23. When the control unit 23 determines that the transmission is from the mobile station 201, the control unit 23 outputs a voice to the relay unit 24. The relay unit 24 of the direct communication dedicated device 20 transmits it to the relay unit 14 of the base station via dedicated device 10 by serial transmission of the dedicated cable 11b, and from the relay unit 14 through the control unit 23, the base station via the base station BS1. It is transmitted to the mobile station 101 and the mobile station 102 in the communicable area 40 of the BS 1.

  The direct communication dedicated device 20 responds to the direct communication (relay) simplex call setting request, which will be described later, with the control program executed by the control unit 23, the transmission function of the direct communication simplex call setting (relay), and the ID number. It has a transmission function and the like of the added synchronization burst SB (B / I = I, ID = “direct communication mobile station 201”).

(Communication mode)
FIG. 6 is a diagram for explaining the communication mode of the direct communication mobile station in the communication area 50. As shown in FIG. FIG. 7 is a diagram for explaining another communication mode of the direct communication mobile station in the communication area 50. In FIG.

  As shown in FIG. 6, the direct communication mobile station 201 in the communication area 50 and the direct communication mobile station 202 communicate directly with the direct communication mobile station 201 and the direct communication mobile station 202, for example, like a transceiver. It is possible to communicate directly without intervention of the dedicated device 20. This communication mode can be referred to, for example, as a first communication mode or a direct communication mode.

  FIG. 7 shows a newly added communication mode according to the present invention. In this communication mode, the direct communication mobile station 201 and the direct communication mobile station 202 in the communication area 50 communicate via the direct communication dedicated device 20. In this communication mode, it is also possible to relay from the base station via the dedicated device 10 directly to the communication mobile station 201 and the direct communication mobile station 202 via the direct communication dedicated device 20. This communication mode can be called, for example, a second communication mode or a direct communication (relay) group communication mode. In the second communication mode, the direct communication dedicated device 20 also manages the transmission right of the direct communication mobile station (201, 202) and the transmission right of transmission from the base station via dedicated device 10 by the direct communication dedicated device 20. That is, in the second communication mode, it can be considered that the relay station 1 manages the transmission right to the direct communication mobile station 201 and the direct communication mobile station 202 in the communication area 50.

(Configuration of direct communication mobile station)
FIG. 8 is a diagram for explaining the configuration of the direct communication mobile station. The configuration of the direct communication mobile station 201 shown in FIG. 8 is applicable to the other direct communication mobile stations (202, 201b, 202b) shown in FIG. In FIG. 8, the configuration of the direct communication mobile station 201 is described as a representative of the direct communication mobile station.

  The direct communication mobile station 201, which is a wireless communication terminal, is connected to the antenna AT1, the transmitting unit T and the receiving unit R to which the antenna AT1 is connected, and the transmitting unit T and the receiving unit R. And a press-to-talk switch PTT connected to the central processing unit CPU. The direct communication mobile station 201 also comprises a loudspeaker SP, a microphone MIC, a loudspeaker SP and a speech encoding and decoding device CODEC provided between the microphone MIC and the central processing unit CPU.

  When the press-to-talk switch PTT is pressed, the direct communication mobile station 201 enters the transmission mode, and the speech spoken to the microphone MIC is encoded by the speech encoding and decoding device CODEC, and the central processing unit CPU and transmission The signal is transmitted as a transmission signal from the antenna AT1 via the unit T. On the other hand, when the press talk switch PTT is not pressed, the reception signal received from the antenna AT1 is decoded by the speech coding and decoding device CODEC via the reception unit R and the central processing unit CPU, and the speaker SP Output as an audio signal.

  The direct communication mobile station (201, 202, 201b, 202b) shown in FIG. 8 has a function to transmit a direct communication (relay) simplex call setting request, which will be described later, by the control program executed by the central processing unit CPU, direct communication Frequency switching function when simplex call setup (relay) is received, synchronous burst SB added with ID number which is terminal identification number of own station (B / I = I, ID = “direct communication mobile station 201”) And a voice generation function for notifying the user of success or failure of acquisition of the transmission right.

(Composition of communication frame)
FIG. 9 is a diagram for explaining the configuration of a communication frame between the direct communication dedicated device and the direct communication mobile station in the second communication mode.

  In the second communication mode (direct communication (relay) group communication mode), as shown in FIG. 9A, one frame is, for example, 40 ms, and each frame is 10 ms. It contains four communication slots. Of the four communication slots, the zeroth slot is indicated by CH1 and the second slot is indicated as CH2. The length from the beginning of 0 slot CH1 to the beginning of 2 slots CH2 is, for example, 20 ms. The first and third slots can be empty slots. (B) of FIG. 9 shows the transmission / reception situation of the direct communication dedicated device 20, and (C) of FIG. 9 shows the transmission / reception situation of the direct communication mobile station, for example, the direct communication mobile station 201. In the zero slot CH1, the direct communication dedicated device 20 transmits Tx, and the direct communication mobile station 201 receives Rx. In the 2-slot CH2, the direct communication mobile station 201 performs transmission Tx, and the direct-communications dedicated device 20 receives Rx (the 2-slot CH2 is a reception slot of the direct-communications dedicated device 20). In (B) and (C) of FIG. 9, communication slots other than the transmission Tx and the reception Rx are idle (I) slots.

  That is, the 0 slot CH 1 is a transmission slot of the direct communication dedicated device 20, and is a reception slot of the direct communication mobile station 201. The 2-slot CH2 is a transmission slot of the direct communication mobile station 201, and is a reception slot of the direct communication dedicated device 20.

  In (B) and (C) of FIG. 9, an idle (I) slot is inserted as an offset between transmission and reception, between the transmission slot (transmission Tx) and the reception slot (reception Rx). However, in particular, the idle (I) slot may not be inserted, and at least an idle state for interference prevention may be provided between the transmission slot (transmission Tx) and the reception slot (reception Rx). .

(Timing chart)
Next, the second communication mode (direct communication (relay) group communication mode) will be described in detail with reference to FIGS. 10 to 14. 10-14, the direct communication mobile station (201, 202), the direct communication dedicated device 20, the base station BS1 and the mobile station 101 on the base station side are taken as an example for the second communication mode (direct communication (direct communication A timing chart of the relay) group communication mode will be described. Further, in FIGS. 10 to 14, CAC means a common access channel, and USC means a user dedicated channel.

(Direct communication mobile station call)
FIG. 10 is a timing chart showing the calling of the direct communication mobile station, and in the direct communication (relay) group communication mode, the direct communication mobile station requested the second communication mode (direct communication (relay) group communication mode) The timing chart of the case is shown.

  In step S1, the direct communication mobile station 201 transmits a direct communication (relay) simplex call setup request to the direct communication dedicated device 20 via the CAC to request the direct communication (relay) group communication mode. . The direct communication (relay) simplex call setup request is transmitted, for example, by pressing the press talk switch PTT of the direct communication mobile station 201. A group number for performing group communication is added to the direct communication (relay) simplex call setting request. The group number is, for example, No. 10 is the first group (201, 202, 20, 101), No. 1 group. 20 can be the second group (201, 101, 101b, 201b) or the like. For example, when a group number (No. 10) is added to a direct communication (relay) simplex call setting request, group communication among communication terminals (201, 202, 20, 101) registered in the first group Is permitted.

  In step S2, the direct communication dedicated device 20 that has received the direct communication (relay) simplex call setup request implements a group communication start sequence with the base station BS1 and the base station side mobile station 101.

  In step S3, the direct communication dedicated device 20 searches for an available channel under the direct communication dedicated device 20.

  In step S4, when an available channel available in step S3 is searched, the direct communication dedicated device 20 performs direct communication simplex call setup (relay) in order to perform group communication using the available channel as a communication channel. Transmit directly to the communication mobile station (201, 202) using CAC.

  In step S5, the direct communication dedicated device 20 and the direct communication mobile station (201, 202) perform switching to the frequency corresponding to the communication channel as preparation for group communication.

  In step S6, when the direct communication dedicated device 20 can transmit, it continues to transmit the synchronization burst SB (B / I = I) indicating idle to the direct communication mobile station (201, 202) using the USC.

  That is, when the direct communication mobile station 201 transmits "direct communication (relay) group communication", the direct communication dedicated device 20 sets "direct communication simplex call" after the group communication call connection with the base station BS1 is completed. (Relay) is transmitted to the direct communication mobile stations 201 and 202 under the relay umbrella of the direct communication dedicated device 20. Thereafter, the direct communication dedicated device 20 transmits a synchronization burst SB (B / I = I) indicating idle in the 0 slot (CH1) of the communication channel. The direct communication mobile stations 201 and 202 make the call connection complete by receiving the SB (B / I = I) on the communication channel.

  This completes the setting of group communication in the direct communication (relay) group communication mode.

(Call originating from mobile station on base station side)
FIG. 11 is a timing chart showing the calling of the mobile station on the base station side, and in the direct communication (relay) group communication mode, the mobile station on the base station side performs the second communication mode (direct communication (relay) group communication mode 7 shows a timing chart in the case of requesting).

  In step S10, when the mobile station 101 on the base station side requests the direct communication (relay) group communication mode, the direct communication dedicated device 20 implements a group communication start sequence from the base station side.

  In step S11, the direct communication dedicated device 20 searches for an available channel under the direct communication dedicated device 20.

  In step S12, when an available channel available in step S3 is searched, in order to perform group communication using the available channel as a communication channel, the direct communication dedicated device 20 performs direct communication simplex call setting (relaying), Transmit directly to the communication mobile station (201, 202) using CAC.

  In step S13, the direct communication dedicated device 20 and the direct communication mobile station (201, 202) perform switching to the frequency corresponding to the communication channel as preparation for group communication.

  In step S14, when the direct communication dedicated device 20 can transmit, it continues to transmit the synchronization burst SB (B / I = I) indicating idle to the direct communication mobile station (201, 202) using the USC.

  When transmitting "direct communication (relay) group communication" from the base station BS1, after the group communication call connection with the base station BS1 is completed, the direct communication dedicated device 20 performs "direct communication simplex call setting (relay)". Are transmitted to the direct communication mobile stations 201 and 202 under the relay umbrella of the direct communication dedicated device 20. Thereafter, the direct communication dedicated device 20 transmits a synchronization burst SB (B / I = I) indicating idle in the 0 slot (CH1) of the communication channel. The direct communication mobile stations 201 and 202 make the call connection complete by receiving the SB (B / I = I) on the communication channel.

  This completes the setting of group communication in the direct communication (relay) group communication mode.

(Successful acquisition of transmission right of direct communication mobile station)
FIG. 12 shows a timing chart when the direct communication mobile station succeeds in acquiring the transmission right. In FIG. 12, when setting of group communication is completed according to FIG. 10 or 11, and group communication is being performed, the direct communication mobile station 201 requests a transmission right and the direct communication mobile station 201 acquires a transmission right. The case is shown.

  Step S20 shows a state in which group communication is being performed.

  In step S21, the direct communication dedicated device 20 transmits the synchronization burst SB (B / I = I, ID = “none”) to which the ID number is not added to the direct communication mobile station 201, 202 using the USC. Send an idle status.

  In step S22, since the direct communication mobile station 201 acquires the transmission right, the direct communication mobile station 201 adds the ID number which is the terminal identification number of its own station to the synchronization burst SB (B / I = I, ID = “directly The communication mobile station 201 ′ ′) is sent directly to the communication dedicated device 20 using the USC. Here, the direct communication mobile station 201 indicates its own ID number as 201.

  In step S23, the direct communication dedicated device 20 adds the received ID of the direct communication mobile station 201, and adds the added synchronization burst SB (B / I = I, ID = “direct communication mobile station 201”) to the USC. Directly to the communication mobile station 201. The direct communication dedicated device 20 repeatedly executes steps S22 and S23 until the result of acquisition of the transmission right is received.

  In step S24, the direct communication dedicated device 20 executes a transmission right acquisition sequence with the base station BS1. Here, it is assumed that the direct communication mobile station 201 succeeds in acquiring the transmission right.

  In step S25, the direct communication only device 20 directly transmits the result OK of the acquisition of the transmission right to the direct communication mobile station 201 by using the associated control channel DACCH (transmission right acquisition result OK) using the USC. As a result, the direct communication mobile station 201 succeeds in acquiring the transmission right. In order to notify the user of the direct communication mobile station 201 of the success of acquisition of the transmission right, the direct communication mobile station 201 generates voice (for example, beep) from the speaker SP.

  In step S26, the direct communication mobile station 201 transmits the voice data as the TCH (voice) to the direct communication dedicated device 20 using the USC. Voice data is generated by pressing the press talk switch PTT of the direct communication mobile station 201 and speaking into the microphone MIC.

  In step S27, the direct communication only device 20 transmits the TCH (voice) received in step S26 to the direct communication mobile station 202 using the USC.

  Thereby, the voice data of the direct communication mobile station 201 is supplied to the communication terminal (for example, 201, 202, 20, 101) registered in the group number, and the communication terminal (for example, 201, 202, 20, 101) Audio is generated from each speaker (SP).

(Failure to acquire transmission right of direct communication mobile station)
FIG. 13 shows a timing chart when the direct communication mobile station fails to acquire the transmission right. In FIG. 13, when setting of group communication is completed according to FIG. 10 or FIG. 11 and group communication is being performed, the direct communication mobile station 201 requests a transmission right, and the direct communication mobile station 201 acquires a transmission right. Indicates a failure.

  Step S30 shows a state in which group communication is being performed.

  In step S31, the direct communication dedicated device 20 transmits the synchronization burst SB (B / I = I, ID = “none”) to which the ID number is not added, to the direct communication mobile station 201, 202 using USC. Send an idle status.

  In step S32, since the direct communication mobile station 201 acquires the transmission right, the direct communication mobile station 201 adds the ID number which is the terminal identification number of its own station to the synchronization burst SB (B / I = I, ID = “directly The communication mobile station 201 ′ ′) is sent directly to the communication dedicated device 20 using the USC. Here, the direct communication mobile station 201 indicates its own ID number as 201.

  In step S33, the direct communication only device 20 adds the received ID of the direct communication mobile station 201 to the synchronization burst SB (B / I = I, ID = “direct communication mobile station 201”) using the USC, Directly send to communication mobile station 201. The direct communication dedicated device 20 repeatedly executes steps S32 and S33 until the result of acquisition of the transmission right is received.

  In step S34, the direct communication dedicated device 20 executes a transmission right acquisition sequence with the base station BS1. Here, it is assumed that the direct communication mobile station 201 has failed to acquire the transmission right.

  In step S35, the direct communication only device 20 directly transmits a failure as a result of the acquisition of the transmission right to the direct communication mobile station 201 using the USC by the associated control channel DACCH (failure in the acquisition of the transmission right). As a result, the direct communication mobile station 201 recognizes that the acquisition of the transmission right has failed, and stops the transmission in step S32. In order to notify the user of the direct communication mobile station 201 of the failure to acquire the transmission right, the direct communication mobile station 201 generates voice (eg, boo) from the speaker SP.

(Successful acquisition of transmission right of mobile station at base station)
FIG. 14 shows a timing chart when the base station side mobile station succeeds in acquiring the transmission right. In FIG. 14, when setting of group communication is completed according to FIG. 10 or FIG. 11 and group communication is performed, the mobile station 101 on the base station side requests a transmission right and the mobile station 101 acquires a transmission right. Shows a successful case.

  Step S40 shows a state in which group communication is performed.

  In step S41, the base station BS1 transmits a traffic channel TCH (B / I = I) indicating idle to the mobile station 101 and the direct communication dedicated device 20.

  In step S42, the direct communication dedicated device 20 directly communicates the synchronization burst SB (B / I = I, ID = “none”) using the USC based on the reception of TCH (B / I = I). It transmits to the mobile stations 201 and 202 and transmits that it is in an idle state.

  In step S43, the mobile station 101 sends a speech request SB2 to the base station BS1 based on the reception of TCH (B / I = I) in order to acquire the transmission right. The speech request SB2 is transmitted, for example, by pressing the press talk switch of the mobile station 101.

  In step S44, the base station BS1 sends the speech approval SB3 to the mobile station 101 in response to the speech request SB2.

  In step S45, the mobile station 101 transmits the speech acceptance SB4 to the base station BS1 in response to the reception of the speech recognition SB3.

  In step S46, in response to the reception of the speech acceptance SB4, the base station A sends a traffic channel TCH (B / I = B) indicating busy to the mobile station 101 and the direct communication dedicated device 20. Thus, the mobile station 101 succeeds in acquiring the transmission right.

  In step S47, in response to the reception of the TCH (B / I = B), the direct communication only device 20 transmits the direct communication to the mobile communication stations 201 and 202 and transmits that it is in the idle state.

  Thereafter, the mobile station 101 sends TCH (voice) to the base station BS1, and the base station BS1 sends the received TCH (voice) directly to the dedicated communication device 20. The direct communication dedicated device 20 transmits the received TCH (voice) to the subordinate direct communication mobile stations 201 and 202.

  Thereby, the voice data of the mobile station 101 is supplied to the communication terminals (for example, 201, 202, 20, 101) registered in the group number.

  As described above, the direct communication dedicated device 20 manages the transmission right of the direct communication mobile station (201, 202) directly under the umbrella of communication, and the result (presence or absence) of acquisition of the transmission right is directly transmitted to the communication mobile station (201, 202). To notify. The direct communication mobile stations 201 and 202 receive the transmission right acquisition result from the direct communication dedicated device 20 and then transmit voices to the communication terminals (for example, 201, 202, 20, 101) registered in the group number.

  This solves the problem that the voice at the beginning (first) of the call is cut off by transmitting the voice data after the acquisition of the transmission right is known in the wireless transmission system 100. Further, by directly controlling the acquisition of the transmission right, the communication-dedicated machine 20 eliminates the collision of the acquisition of the transmission right and does not hear the voice.

  As mentioned above, although the invention made by the present inventor was concretely explained based on an example, the present invention is not limited to the above-mentioned embodiment and an example, and it can not be overemphasized that it can change variously .

1: Relay station (repeater)
10: Dedicated machine via base station (wireless machine via base station)
20: Direct communication dedicated machine (Direct communication wireless device)
60: line control device 70: communication console 100: wireless communication system 101, 102: mobile station 201, 202 at the base station side: direct communication mobile station (wireless communication terminal)
AT10, AT20, AT1: Antenna BS1, BS2: Base station

Claims (12)

A base station,
With multiple mobile stations,
And a relay station,
The relay station
A radio via a base station for performing group communication with the base station;
A direct communication radio for performing group communication with the mobile station in an area where the base station is out of communication area;
The direct communication radio manages the transmission right of the mobile station,
Wireless communication system. In claim 1,
The wireless communication system, wherein the mobile station sends a synchronization burst signal added with an ID number of the mobile station to the direct communication wireless device when requesting the transmission right to the direct communication wireless device. In claim 1,
The wireless communication system, wherein the mobile station, when requesting the group communication, transmits a setting request to which the group number is added, to the direct communication wireless device. In claim 1,
A communication frame between the direct communication radio and the mobile station includes a plurality of slots,
For transmission from the direct communication radio to the mobile station, one slot of the plurality of slots is used,
A radio communication system, wherein transmission from the mobile station to the direct communication radio uses another slot different from the one slot. A radio via a base station for performing group communication with the base station;
A direct communication radio for performing group communication with a mobile station in an area where the base station is out of communication area;
The direct communication radio manages the transmission right of the mobile station,
Relay device. In claim 5,
The relay apparatus, wherein the direct communication wireless device transmits, to the mobile station, a synchronization burst signal to which an ID number of the mobile station is added, when the mobile station requests the transmission right. In claim 5,
The relay apparatus, wherein the direct communication wireless device transmits a setting for instructing frequency switching to the mobile station when the mobile station requests the group communication. In claim 5,
A communication frame between the direct communication radio and the mobile station includes a plurality of slots,
For transmission from the direct communication radio to the mobile station, one slot of the plurality of slots is used,
The relay apparatus, wherein transmission from the mobile station to the direct communication radio uses another slot different from the one slot. A wireless communication terminal that performs group communication with a direct communication wireless device of a relay station,
The wireless communication terminal, wherein the transmission right of the group communication is managed by the direct communication wireless device. In claim 9,
A wireless communication terminal for sending a setting request added with a group number to the relay station when requesting the group communication from the direct communication wireless device. In claim 9,
A wireless communication terminal, which sends a synchronization burst signal to which an ID number of its own station is added, to the relay station when requesting the transmission right to the direct communication wireless device. In claim 9,
The communication frame with the direct communication radio includes a plurality of slots,
The reception from the direct communication radio uses one slot of the plurality of slots,
A wireless communication terminal, wherein transmission to the direct communication radio uses another slot different from the one slot.

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