JP4646564B2 - Mobile communication system, link control method, and program - Google Patents

Description

  The present invention relates to a mobile communication system, a link control method, and a program, and more particularly to a link control method in multilink connection.

In a mobile communication system represented by a conventional PHS (Personal Handyphone System), communication is performed using a plurality of links in one call, thereby enabling communication over a wider band than when only one link is used. There is a connection form called multi-link connection. When performing the multilink connection, it is often the case that the connection is first made with one link, and then the other links are connected (added). In this way, the number of links to be used can be increased in accordance with the link availability. Specifically, for example, there is a method of adding links using the technique described in Patent Document 1.
Japanese Patent Laid-Open No. 2000-102055

  Here, in the conventional multilink connection, when a link is added, a wireless packet link channel establishment request (for link addition) is transmitted from the mobile station apparatus to the base station apparatus using the control channel. The base station device that has received the link addition request determines whether or not the link addition is possible, and returns a radio packet link channel assignment (for link addition) to the mobile station device. In this way, an additional link is realized.

  Similarly, when the link being communicated is inactive (inactive) due to a small amount of communication in multilink connection, the link is also returned to active (active). A wireless packet link channel establishment request (inactive recovery) is transmitted from the mobile station apparatus to the base station apparatus using the control channel. The base station apparatus that has received the inactivity recovery request determines whether or not inactive recovery is possible, and returns radio packet link channel assignment (inactive recovery) to the mobile station apparatus. In this way, not only the addition of the link but also the reduction and the re-addition after the reduction are realized. That is, the link is configured to be increased or decreased according to the traffic.

  However, with the recent increase in subscribers and traffic in mobile communication systems, the number of links per base station apparatus has increased dramatically. Specifically, for example, what has been 1C3T (1 control channel + 3 communication channels) in one base station so far has increased to 1C15T and 1C31T. That is, although the number of communication channels can be increased, the number of control channels cannot be increased at present, so the amount of communication per control channel increases and the control channel is often congested.

  The wireless packet link channel establishment request is also one of the causes of control channel congestion because the communication channel to be added is not connected at the time of link addition and can only be transmitted through the control channel. Yes.

  In addition, the control channel is originally shared by a plurality of communication channels, and in the case of the TDMA system, one of the time slots transmitted and received in a time division manner is used as the control channel. There is a time lag in transmission and reception in the channel. For this reason, it takes time to transmit a link establishment request and link assignment at the time of link addition or inactive recovery, and as a result, it takes time for link addition or inactive recovery. In addition, since the communication amount of the control channel is increased as described above, a longer time is required.

  The present invention has been made in view of the above-mentioned problems, and its object is to reduce the congestion of the control channel and to shorten the time at the time of link addition or inactive recovery, and a link control method. And providing a program.

  A mobile communication system according to the present invention for solving the above problems includes a base station device and a mobile station device, wherein the mobile station device and the base station device include at least one control channel; In a mobile communication system that performs communication using a plurality of communication channels, the mobile station apparatus and the base station apparatus communicate using at least one communication channel of the communication channels. The mobile station apparatus and the base station apparatus decide to perform communication using a communication channel other than the communication channel that is the communication channel with which the communication is performed. In this case, in the base station apparatus, a link channel allocation for transmitting a link channel assignment indicating a communication channel that can be communicated to the mobile station apparatus using the channel in communication. In the mobile station apparatus, a link channel assignment receiving means for receiving a link channel assignment transmitted by the link channel assignment transmitting means, and a link channel assignment transmitted by the link channel assignment transmitting means in the mobile station apparatus. Communication means for performing communication between the mobile station apparatus and the base station apparatus using a communication channel indicated by the link channel assignment.

  By doing so, it is possible to transmit the link channel assignment indicating the communication channel that can be communicated using the first communication channel, so that the congestion of the control channel can be reduced. Further, it is possible to shorten the time for link addition or inactive recovery.

  Further, in the mobile communication system, when the mobile station apparatus determines to perform communication using another communication channel other than the communication channel, the mobile station apparatus sets the communication channel to A link channel allocation request transmitting means for transmitting a link channel allocation request indicating that the base station apparatus is requested to allocate a communication channel, and transmitted by the link channel allocation request transmitting means in the base station apparatus. Link channel assignment request receiving means for receiving the link channel assignment request, wherein the link channel assignment transmitting means is responsive to the link channel assignment request received by the link channel assignment request receiving means in response to the communication. The medium channel is used to send a link channel assignment indicating a communication channel that can be communicated. It is also possible to be. In this way, since the link channel assignment request indicating that the communication channel assignment is requested can be transmitted using the first communication channel, the congestion of the control channel can be reduced. Further, it is possible to shorten the time for link addition or inactive recovery.

  In the mobile communication system, the link channel assignment transmission means may transmit the link channel assignment as connectionless communication. In this way, link channel assignment can be transmitted promptly.

  In the mobile communication system, the link channel allocation request transmission means may transmit the link channel allocation request as connectionless communication. In this way, the link channel assignment request can be transmitted promptly.

  In the mobile communication system, a link channel assignment using channel selection means for selecting whether to transmit the link channel assignment using a control channel or to transmit the link channel assignment using a communication channel; When the link channel allocation use channel selection unit selects to transmit the link channel allocation using a communication channel, the link channel allocation transmission unit uses the communication channel in the base station apparatus. Then, a link channel assignment indicating a communication channel capable of communication may be transmitted to the mobile station apparatus. In this way, the communication channel can be used efficiently.

  Further, in the mobile communication system, a link channel allocation request use channel for selecting whether to transmit the link channel allocation request using a control channel or to transmit the link channel allocation request using a communication channel. When the selection means and the link channel allocation request use channel selection means are selected to transmit the link channel allocation request using a communication channel, the link channel allocation request transmission means, in the mobile station apparatus, A link channel assignment request may be transmitted indicating that the base station apparatus is requested to assign a communication channel using the communication channel. Even in this case, the communication channel can be used efficiently.

  The link control method according to the present invention controls a link in a mobile communication system in which a mobile station apparatus and a base station apparatus communicate using at least one control channel and a plurality of communication channels. When the mobile station apparatus and the base station apparatus communicate using at least one communication channel among the communication channels, the mobile station apparatus and the base station In the base station apparatus, when it is determined to perform communication using another communication channel other than the communication channel that is the communication channel in which the communication is performed, at least one of the devices, A link channel assignment transmission step of transmitting a link channel assignment indicating a communication channel capable of communicating with the mobile station apparatus using the channel, and the mobile station The link channel assignment receiving step for receiving the link channel assignment transmitted in the link channel assignment sending step, and according to the link channel assignment transmitted in the link channel assignment sending step, the mobile station apparatus, And a communication step of performing communication with the base station apparatus using a communication channel indicated by the link channel assignment.

  Further, the base station apparatus according to the present invention is a base station apparatus that performs communication using a mobile station apparatus, at least one control channel, and a plurality of communication channels, the mobile station apparatus, and the base station A communication channel in which at least one of the mobile station device and the base station device is performing the communication when the device is communicating using at least one communication channel of the communication channels Link channel assignment indicating a communication channel that can be communicated to the mobile station apparatus using the communication channel when it is determined to perform communication using another communication channel other than the communication channel Between the mobile station apparatus according to the link channel assignment transmitted by the link channel assignment transmitting means and the link channel assignment transmitting means for transmitting Characterized in that it comprises a communication means for performing communication using a communication channel indicated by the link channel assignment, the.

  The mobile station apparatus according to the present invention is a mobile station apparatus that performs communication using a base station apparatus, at least one control channel, and a plurality of communication channels, the mobile station apparatus, and the base station When communication is performed with an apparatus using at least one of the communication channels, a communication channel other than the communication channel that is the communication channel with which the mobile station apparatus performs communication A link channel allocation request for transmitting a link channel allocation request indicating that a communication channel allocation is requested to the base station apparatus using the channel in communication when it is determined to perform communication using A link channel assignment receiving means for receiving a link channel assignment transmitted by the base station apparatus; Depending on the link channel assignment is received by the signal unit, a communication unit for communicating using a communication channel indicated by the link channel assignment between the base station apparatus, characterized in that.

  The program according to the present invention is a program for causing a computer to function as a base station apparatus that performs communication using a mobile station apparatus, at least one control channel, and a plurality of communication channels. When the apparatus and the base station apparatus communicate using at least one of the communication channels, at least one of the mobile station apparatus and the base station apparatus Communication that can be communicated to the mobile station device using the communication channel when it is determined to perform communication using another communication channel other than the communication channel that is the communication channel performing communication A link channel assignment transmitting means for transmitting a link channel assignment indicating a channel, and the link transmitted by the link channel assignment transmitting means. Depending on the channel allocation, characterized in that causes the computer to function as a communication means, which performs communication using a communication channel indicated by the link channel assignment between the mobile station device.

  A program according to another aspect of the present invention is a program for causing a computer to function as a mobile station apparatus that performs communication using a base station apparatus, at least one control channel, and a plurality of communication channels. In this case, when the mobile station apparatus and the base station apparatus communicate using at least one communication channel of the communication channels, the communication channel on which the mobile station apparatus performs the communication This indicates that the base station apparatus requests allocation of a communication channel to the base station apparatus using the communication channel when it is determined to perform communication using another communication channel other than the communication channel. A link channel allocation request transmitting means for transmitting a link channel allocation request, and a link channel allocation transmitted by the base station apparatus. And a communication channel indicated by the link channel assignment with the base station apparatus according to the link channel assignment received by the link channel assignment receiving means. And a communication means for performing the function of the computer.

  Embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, mobile communication system 1 according to the present embodiment includes base station apparatus 2, mobile station apparatus 3, and communication network 4. The base station device 2 normally communicates with a plurality of mobile station devices 3.

  As illustrated in FIG. 2, the base station apparatus 2 includes a control unit 21, a storage unit 22, a wireless communication unit 23, and a network interface unit 24. The control unit 21 controls each unit of the base station apparatus 2 and executes processing related to telephone calls and data communication. The storage unit 22 operates as a work memory for the control unit 21. The storage unit 22 holds programs and parameters related to various processes performed by the control unit 21, and also stores a program according to the present invention. The wireless communication unit 23 includes an antenna, receives and demodulates a voice signal, a communication packet, and the like from at least one mobile station device 3 and outputs them to the control unit 21 or an instruction input from the control unit 21 Accordingly, processing such as modulating a voice signal or a communication packet input from the control unit 21 and outputting it via an antenna is performed. The network interface unit 24 is connected to the communication network 4 and receives an audio signal, a communication packet, and the like from the communication network 4 and outputs them to the control unit 21, or according to an instruction from the control unit 21. A packet or the like is transmitted to the communication network 4.

  As shown in FIG. 3, the mobile station device 3 includes a control unit 31, a storage unit 32, and a wireless communication unit 33. The control unit 31 controls each unit of the mobile station device 3 and executes processing related to a call and data communication. The storage unit 32 operates as a work memory for the control unit 31. The storage unit 32 holds programs and parameters related to various processes performed by the control unit 31, and also stores a program according to the present invention. The wireless communication unit 33 includes an aerial line, and modulates an audio signal, a communication packet, and the like according to an instruction input from the control unit 31 and outputs the modulated signal or the like via the aerial line. Is received, demodulated, and output to the control unit 31.

  FIG. 4 is a diagram illustrating a flow of communication signals among the base station apparatus 2, the mobile station apparatus 3, and the communication network 4. When the mobile station apparatus 3 is a circuit switching terminal (circuit switching terminal 3-15 to circuit switching terminal 3-18), a signal transmitted from the mobile station apparatus 3 is first received by the base station apparatus 2, It is transmitted from the station apparatus 2 to the exchange network 5. The exchange network 5 is a component included in the communication network 4 and is generally configured to include a plurality of exchanges. Then, it is connected to the circuit switching terminal on the receiving side via the switching network 5. On the other hand, when the mobile station apparatus 3 is a packet terminal (packet terminal 3-11 to packet terminal 3-14), first, a signal transmitted from the mobile station apparatus 3 is received by the base station apparatus 2, and further, the base station It is transmitted from the apparatus 2 to the exchange network 5. Then, it is transmitted from the switching network 5 to the packet network 6 and connected to a TCP / IP network such as the Internet or a packet terminal on the receiving side. The packet network 6 is also a constituent element included in the communication network 4 and is generally configured to include a plurality of packet servers.

  Communication between the base station apparatus 2 and the mobile station apparatus 3 is performed using a physical channel. The physical channel is, for example, a time slot in the TDMA system or a PN code in the CDMA system. In the normal mobile communication system 1, the physical channel is logically divided into a communication channel and a control channel, and the communication channel and the control channel are assigned to different physical channels. In the control channel, communication control signals are exclusively transmitted and received between the base station device 2 and the mobile station device 3. In the communication channel, user data is transmitted and received between the base station device 2 and the mobile station device 3.

  In this way, the control channel and the communication channel are logically separated from each other in the mobile communication system 1 in order to perform communication control such as position registration control, outgoing / incoming call control, channel switching control, etc. It is necessary to maintain a communicable state between the station apparatus 2 and the mobile station apparatus 3, and for this purpose, for example, the mobile station apparatus 3 refers to the control channel periodically or intermittently, It monitors whether or not there is a signal transmitted toward the mobile station apparatus 3 itself.

  Since the control channel is used in this manner, one control channel is usually provided for each base station apparatus 2. The mobile station apparatus 3 monitors the one control channel. Here, taking the case of the start of communication as an example, a specific example of the link control technology as the background of the present invention will be shown below.

  FIG. 8 shows an example of a signal sequence when a packet is transmitted from the mobile station device 3. First, the mobile station apparatus 3 transmits a wireless packet link channel establishment request for assigning a communication channel through the control channel (S1002). The base station device 2 that has received the request for establishment of the radio packet link channel transmits radio packet link channel assignment for assigning the communication channel 1 to the mobile station device 3 (S1004). The base station apparatus 2 and the mobile station apparatus 3 both prepare to use the communication channel 1 by the processing so far. Further, after establishing synchronization (S1006), the asynchronous balanced mode setting (S1008), unnumbered confirmation (S1010), call setting (S1014), and call setting reception (S1016) are transmitted and received in this order. The communication is started (S1020).

  Further, when performing the above-described multilink connection, first, the mobile station apparatus 3 determines link addition (S1022). Then, a new communication channel is assigned from the base station apparatus 2 by the same process as described above. Specifically, a wireless packet link channel establishment request is transmitted to the base station apparatus (S1024). The base station apparatus 2 that has received the request for establishment of the radio packet link channel transmits radio packet link channel assignment for assigning the communication channel 2 to the mobile station apparatus 3 (S1026). Through the processing so far, both the base station apparatus 2 and the mobile station apparatus 3 prepare to use the communication channel 2 in addition to the communication channel 1. Further, after establishing synchronization (S1028), communication is performed by transmitting and receiving asynchronous balanced mode setting (S1030), unnumbered system confirmation (S1032), call setting (S1034), and call setting reception (S1036) in this order. The communication is started for the communication channel 2 (S1040).

  In this way, by using the control channel for communication channel assignment, it is possible to accommodate as much user data as possible in the communication channel, and the assignment of the communication channel 1 and the communication channel 2 is the same. It is realized by processing and simplification of processing is realized.

  However, if this is done, the situation where the control channel is congested is increasing against the increase in communication channels due to the recent increase in demand for the mobile communication system 1. That is, since one control channel per base station apparatus 2 is one as described above, any number of communication channels can be accommodated. For example, 1C3T (1 control channel + 3 communication channels) in one base station so far However, the proportion of communication channels has increased to 1C15T and 1C31T, the number of signals to be processed by the control channel has increased, and the control channel is often congested.

  In addition, the control channel is originally shared by a plurality of communication channels, and in the case of the TDMA system, one of the time slots transmitted and received in a time division manner is used as the control channel. There is a time lag in transmission and reception in the channel. For this reason, it takes time to transmit a link establishment request and link assignment at the time of link addition or inactive recovery, and as a result, it takes time for link addition or inactive recovery. In addition, since the communication amount of the control channel is increased as described above, a longer time is required.

  The present invention has been made for the purpose of solving such problems and reducing the congestion of the control channel and shortening the time at the time of link addition or inactive recovery. FIG. 5 shows the first embodiment of the present invention. 2 shows functional block diagrams of the base station apparatus 2 and the mobile station apparatus 3 in FIG. Here, description will be given assuming that multilink connection in packet communication is performed.

  As shown in FIG. 5, the base station apparatus 2 functionally includes a transmitting / receiving unit 70, a modem unit 71, a data processing unit 72, a radio packet control unit 73, a radio control unit 74, an additional allocation channel determining unit 75, an additional allocation. The radio packet control unit 73 is configured to include a connection control unit 90, a link expansion allocation activation unit 91, a used channel monitoring unit 92, and a link allocation availability determination unit 93, and includes a radio control unit 74. Includes a control channel controller 94 and a communication channel controller 95. Functionally, the mobile station device 3 includes a transmission / reception unit 80, a modem unit 81, a data processing unit 82, a radio packet control unit 83, a radio control unit 84, an extension request channel determination unit 85, and an extension request instruction unit 86. The wireless packet control unit 83 includes a connection control unit 100, a link addition request activation unit 101, and a used channel monitoring unit 102, and the wireless control unit 84 includes a control channel control unit 103, a communication channel control unit 104. It is comprised including.

  The data processing unit 82 receives user data and a control signal input from a user at a data input unit (not shown), a control signal generated by the control unit 31, encodes it, and outputs it to the modem unit 81. The modem unit 81 modulates the encoded signal input from the data processing unit 82 by a predetermined modulation method and outputs the modulated signal to the transmission / reception unit 80. The transmission / reception unit 80 transmits the modulation signal input from the modulation / demodulation unit 81 to the radio section via the antenna. At this time, the physical channel used for transmission is determined by the radio control unit 84. Specifically, for example, when the data constituting the modulated signal is user data, it is a physical channel used as a communication channel, and is a physical channel constituting the communication channel allocated in the above-described radio packet link channel assignment. Decide to use the channel.

  The data processing unit 82 also performs processing for monitoring the amount of data communication. Then, when the data communication amount exceeds a predetermined amount, it is determined to perform link addition. That is, in communication with the base station apparatus 2, when communication is started using one communication channel at the start of communication, and the data processing unit 82 detects that the data communication amount exceeds a predetermined amount, Decide to communicate using other communication channels as well.

  When it is determined to perform communication using another communication channel, the fact is output to the wireless packet control unit 83. The wireless packet control unit 83 stores the communication channel used in the connection control unit 100. If the data processing unit 82 determines to perform communication using another communication channel, the link addition request activation unit 101 generates a link addition request signal and adds the link addition request signal. This is output to the request channel determination unit 85. On the other hand, the used channel monitoring unit 102 outputs used channel data indicating a used channel, which is a communication channel stored in the connection control unit 100, to the extension request channel determining unit 85.

  The extension request channel determination unit 85 determines to add a communication channel other than the communication channel indicated by the use channel data, includes the extension channel data indicating the communication channel to be added in the link addition request signal, and the extension request instruction unit 86. And the used channel data are output to the extension request instruction unit 86. Then, the extension request instructing unit 86 instructs the communication channel control unit 104 to transmit the input link addition request signal in the communication channel indicated by the input use channel data, and the link extension request signal. Is output to the communication channel control unit 104.

  Then, the radio control unit 84 transmits the link addition request signal input to the base station apparatus 2 by connectionless communication on the communication channel instructed by the addition request instructing unit 86 in the communication channel control unit 104. . That is, the link addition request signal is transmitted without notifying the base station apparatus 2 in advance that the link addition request signal is to be transmitted. By transmitting as connectionless communication in this way, the link extension request signal can be interrupted and transmitted during frame transmission / reception of user data transmitted / received by connection-based communication, and a short waiting time (within 5 msec) Thus, the link addition request signal can be transmitted.

  The link addition request signal is received by the transmission / reception unit 70 of the base station apparatus 2 and demodulated by the modulation / demodulation unit 71 using a predetermined modulation method. Then, the modem unit 71 outputs the demodulated signal to the data processing unit 72, and the data processing unit 72 decodes the demodulated signal.

  On the other hand, the wireless packet control unit 73 receives a link addition request signal included in the signal decoded by the data processing unit 72 from the data processing unit 72. Then, it is determined whether or not the communication channel indicated by the additional channel data included in the link additional request signal can be allocated. Specifically, the connection control unit 90 stores a communication channel used for communication between the base station device 2 and the mobile station device 3 in communication. Then, the number of mobile station apparatuses 3 that are communicating in the communication channel indicated by the extension channel data included in the link extension request signal is acquired. If the number of mobile station apparatuses 3 exceeds a predetermined value, it is determined that the assignment is impossible. On the other hand, if the number of mobile station apparatuses 3 is less than a predetermined value, it is determined that allocation is possible. If it is determined that assignment is impossible, the process is terminated.

  On the other hand, if it is determined that allocation is possible, the link expansion allocation activation unit 91 generates a link expansion allocation signal. The link extension assignment signal includes the extension channel data. Then, the link extension allocation signal is output to the extension allocation channel determination unit 75. In addition, the used channel monitoring unit 92 outputs used channel data indicating a used channel, which is a communication channel stored in the connection control unit 90, to the additional allocation channel determining unit 75.

  Here, the extension request channel determination unit 85 of the mobile station apparatus 3 may not include the extension channel data in the link extension request. In such a case, the expansion allocation channel determination unit 75 may determine a channel to which expansion is allocated. That is, additional channel data indicating communication channels with a small number of mobile station devices 3 to be used stored in the connection control unit 90 among the communication channels may be included in the link expansion allocation signal. Then, the extension request channel determination unit 85 outputs the link extension allocation signal including the extension channel data and the used channel data to the extension allocation instruction unit 76.

  Then, the extension allocation instruction unit 76 instructs the communication channel control unit 95 to transmit the input link extension allocation signal in the communication channel indicated by the input use channel data, and the link extension allocation signal. Is output to the communication channel control unit 95.

  Then, the radio control unit 74 transmits the link expansion allocation signal input to the mobile station apparatus 3 by connectionless communication on the communication channel instructed by the expansion allocation instruction unit 76 in the communication channel control unit 95.

  By doing in this way, transmission / reception of each signal of link expansion request / link expansion allocation for multilink connection when link expansion is determined in the mobile station apparatus 3 is performed, and the control channel is not used. Can be alleviated. In addition, it is possible to reduce the time for adding links.

  FIG. 6 is a sequence diagram of processing between the mobile station apparatus 3 and the base station apparatus 2 when the link addition in the multilink connection is performed as described above. First, the mobile station apparatus 3 and the base station apparatus 2 are in a communication (S200) state by a method similar to the background technology. In this state, the mobile station apparatus 3 determines link addition. That is, it is determined to perform communication using another communication channel (S202). Then, the mobile station device 3 transmits a link addition request to the base station device 2 (S204). At this time, the link addition request is transmitted using the communication channel 1 already in communication. Then, the base station apparatus 2 that has received the link expansion request determines whether or not the link expansion is possible, and then returns a link expansion allocation to the mobile station apparatus 3 (S206). Also at this time, the link expansion allocation is transmitted using the communication channel 1 already in communication.

  Then, after establishing synchronization (S208) in the communication channel indicated by the additional channel data included in the link additional allocation (here, it is assumed that the communication channel is 2) by the same process as the background technology, Communication is started by transmitting and receiving balanced mode setting (S210), unnumbered confirmation (S212), call setting (S214), and call setting reception (S216) in this order, and communication is also being performed for communication channel 2 (S220). It becomes.

  In the second embodiment of the present invention, the base station apparatus 2 determines link addition. The functional block diagram of the mobile communication system 1 in the second embodiment is the same as that shown in FIG. In this case, the data processing unit 72 performs processing for monitoring the data communication amount. If the amount of data communication exceeds a predetermined amount, it is determined to perform link addition for communication with the mobile station apparatus 3 exceeding the predetermined amount. That is, in communication with the mobile station device 3, when communication is started using one communication channel at the start of communication, and the data processing unit 72 detects that the data communication amount exceeds a predetermined amount, It decides to communicate with the mobile station apparatus 3 also using another communication channel.

  When it is determined to perform communication using another communication channel, the fact is output to the wireless packet control unit 73. When the data processing unit 72 decides to perform communication using another communication channel, the link expansion allocation activation unit 91 generates a link expansion allocation signal and adds the link expansion allocation signal. It outputs to the allocation channel determination part 75. On the other hand, the used channel monitoring unit 92 outputs used channel data indicating a used channel, which is a communication channel stored in the connection control unit 90, to the additional allocation channel determining unit 75.

  The additional allocation channel determination unit 75 links additional channel data indicating communication channels with a small number of used mobile station devices 3 stored in the connection control unit 90 among communication channels other than the communication channel indicated by the used channel data. Include in the assignment signal. Then, the use channel data and the link extension assignment signal are output to the extension assignment instruction unit 76, and the extension assignment instruction unit 76 sends the communication channel control unit 95 to the communication channel indicated by the input use channel data. An instruction is given to transmit the input link extension assignment signal, and the link extension assignment signal is output to the communication channel control unit 95.

  Then, the radio control unit 74 transmits the link expansion allocation signal input to the mobile station apparatus 3 by connectionless communication on the communication channel instructed by the expansion allocation instruction unit 76 in the communication channel control unit 95.

  By doing this, transmission / reception of link addition allocation signals for multilink connection when link addition is determined in the base station apparatus 2 is performed, and control channel congestion is reduced by not using the control channel. Can do. In addition, it is possible to reduce the time for adding links.

  In the third embodiment of the present invention, after the link is added, the added communication channel is in an inactive state, that is, in a state where it is temporarily not used due to a small amount of data communication. The present invention is applied when the communication channel in the inactive state is restored during communication. The functional block diagram of the mobile communication system 1 in the third embodiment is the same as that shown in FIG. Even when at least one communication channel is in an inactive state, it is assumed that at least one communication channel other than the communication channel in the inactive state is in communication.

  First, a case will be described in which the mobile station device 3 determines to restore a communication channel in an inactive state during communication. First, the data processing unit 82 monitors the data communication amount in the communication channel during communication. When the amount of data communication exceeds a predetermined amount, it is determined to perform processing for restoring the communication channel that is in an inactive state. That is, in the communication with the base station apparatus 2, when the data processing unit 82 detects that the data communication amount exceeds the predetermined amount, it determines to perform communication using another communication channel. .

  When it is determined to perform communication using another communication channel, the fact is output to the wireless packet control unit 83. The wireless packet control unit 83 stores the communication channel used in the connection control unit 100. When the data processing unit 82 decides to perform communication using another communication channel, the link addition request activation unit 101 generates an inactive recovery request signal, and the inactive recovery request signal Is output to the extension request channel determination unit 85. On the other hand, the used channel monitoring unit 102 outputs used channel data indicating a used channel, which is a communication channel stored in the connection control unit 100, to the extension request channel determining unit 85.

  The extension request channel determination unit 85 determines the communication channel that is in an inactive state to be recovered, includes recovery channel data indicating the communication channel to be recovered in the inactive recovery request signal, and outputs the recovery channel data to the extension request instruction unit 86. At the same time, the use channel data is output to the extension request instruction unit 86. Then, the extension request instruction unit 86 instructs the communication channel control unit 104 to transmit the input inactivity recovery request signal in the communication channel indicated by the input use channel data, and also recovers the inactivity. The request signal is output to the communication channel control unit 104.

  Then, the radio control unit 84 transmits the inactive recovery request signal input to the base station apparatus 2 by connectionless communication in the communication channel instructed by the extension request instructing unit 86 in the communication channel control unit 104. To do.

  The inactive recovery request signal is received by the transmission / reception unit 70 of the base station apparatus 2 and demodulated by the modulation / demodulation unit 71 using a predetermined modulation method. Then, the modem unit 71 outputs the demodulated signal to the data processing unit 72, and the data processing unit 72 decodes the demodulated signal.

  On the other hand, the wireless packet control unit 73 receives from the data processing unit 72 an inactivity recovery request signal included in the signal decoded by the data processing unit 72. Then, it is determined whether or not the communication channel indicated by the recovery channel data included in the inactive recovery request signal can be recovered. Specifically, the connection control unit 90 stores a communication channel used for communication between the base station device 2 and the mobile station device 3 in communication. Then, the number of mobile station apparatuses 3 that are communicating is acquired in the communication channel indicated by the recovery channel data included in the inactive recovery request signal. If the number of mobile station apparatuses 3 exceeds a predetermined value, it is determined that the assignment is impossible. On the other hand, if the number of mobile station apparatuses 3 is less than a predetermined value, it is determined that allocation is possible. If it is determined that assignment is impossible, the process is terminated.

  On the other hand, if it is determined that allocation is possible, the link expansion allocation activation unit 91 generates an inactive recovery allocation signal. The inactive recovery allocation signal includes the recovery channel data. Then, the inactive recovery allocation signal is output to the additional allocation channel determination unit 75. In addition, the used channel monitoring unit 92 outputs used channel data indicating a used channel, which is a communication channel stored in the connection control unit 90, to the additional allocation channel determining unit 75. Then, the additional allocation channel determination unit 75 outputs an inactive recovery allocation signal including recovery channel data and used channel data to the additional allocation instruction unit 76.

  Then, the extension allocation instruction unit 76 instructs the communication channel control unit 95 to transmit the input inactive recovery allocation signal in the communication channel indicated by the input use channel data, and the inactive recovery. The allocation signal is output to communication channel control unit 95.

  Then, the radio control unit 74 transmits the inactive recovery allocation signal input to the mobile station apparatus 3 by connectionless communication on the communication channel instructed by the extension allocation instruction unit 76 in the communication channel control unit 95. .

  As described above, since the control channel is not used when the communication channel in the inactive state is restored, congestion of the control channel can be reduced. In addition, the time for inactive recovery can be shortened.

  In the fourth embodiment of the present invention, the base station device 2 determines to restore the communication channel in the inactive state during communication. The functional block diagram of the mobile communication system 1 in the fourth embodiment is the same as FIG. In the fourth embodiment, the data processing unit 72 performs processing for monitoring the data communication amount. When the amount of data communication exceeds a predetermined amount, it is determined to perform inactive recovery for communication with the mobile station device 3 that exceeds the predetermined amount. That is, in communication with the mobile station device 3, when communication is started using one communication channel at the start of communication, and the data processing unit 72 detects that the data communication amount exceeds a predetermined amount, It decides to communicate with the mobile station apparatus 3 also using another communication channel.

  When it is determined to perform communication using another communication channel, the fact is output to the wireless packet control unit 73. When the data processing unit 72 determines to perform communication using another communication channel, the link extension allocation activation unit 91 generates an inactive recovery allocation signal, and the inactive recovery allocation signal Is output to the additional allocation channel determination unit 75. On the other hand, the used channel monitoring unit 92 outputs used channel data indicating a used channel, which is a communication channel stored in the connection control unit 90, to the additional allocation channel determining unit 75.

  The additional allocation channel determination unit 75 inactively restores the recovery channel data indicating the communication channel with a small number of mobile station apparatuses 3 to be used stored in the connection control unit 90 among the communication channels other than the communication channel indicated by the used channel data. Include in recovery allocation signal. Then, the use channel data and the inactive recovery assignment signal are output to the extension assignment instruction unit 76, and the extension assignment instruction unit 76 sends the communication channel control unit 95 to the communication channel indicated by the input use channel data. Instruct to transmit the input inactive recovery allocation signal and output the inactive recovery allocation signal to the communication channel control unit 95.

  Then, the radio control unit 74 transmits the inactive recovery allocation signal input to the mobile station apparatus 3 by connectionless communication on the communication channel instructed by the extension allocation instruction unit 76 in the communication channel control unit 95. .

  As described in the above embodiments, the link channel allocation request, the link allocation request, and the inactivity represented by the link addition request and the inactive recovery request, which are control signals in the link addition and the inactive recovery, are provided. Control channel congestion can be reduced by transmitting and receiving link channel allocation represented by recovery allocation using a communication channel in communication. Further, it is possible to shorten the time for link addition or inactive recovery.

  In the above processing, it is not always necessary to use a communication channel. That is, determine whether to send a link channel assignment request / link channel assignment using a control channel or a link channel assignment request / link channel assignment using a communication channel under certain conditions It is good. This process will be described with reference to the flowchart.

  FIG. 7 is a flowchart of processing when transmitting / receiving a link channel allocation request / link channel allocation by using a control channel and a communication channel separately. First, a link expansion factor / inactive recovery factor is detected (S300). In the above embodiment, detection is performed by the data processing unit 72 or the data processing unit 82. Then, in the same base station apparatus 2, it is determined whether there is another communication channel in communication (S302). If it is determined that there is another communication channel in communication, the communication channel for transmitting / receiving the link channel assignment request / link channel assignment is selected (S304). As for the selection, for example, when communication is being performed on a plurality of communication channels, one communication channel is selected from the plurality of communication channels when further link addition or inactive recovery is performed. Then, link addition and inactive recovery are performed using the selected communication channel (S306).

  On the other hand, if it is determined that there is no other communication channel in communication, the link channel assignment request / link channel assignment is transmitted / received in the control channel (S308). In this way, the communication channel can be used efficiently by performing communication using the communication channel and the control channel in combination.

1 is a configuration diagram of a mobile communication system according to an embodiment of the present invention. It is a block diagram of the base station apparatus which concerns on embodiment of this invention. It is a block diagram of the mobile station apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the flow of the signal of communication between the base station apparatus which concerns on embodiment of this invention, a mobile station apparatus, and a communication network. It is a functional block diagram of the base station apparatus and mobile station apparatus which concern on embodiment of this invention. It is a sequence diagram of the mobile communication system according to the embodiment of the present invention. It is a processing flow figure of the mobile communication system which concerns on embodiment of this invention. It is a sequence diagram of the mobile communication system which concerns on the technique used as the background of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Mobile communication system, 2 Base station apparatus, 3 Mobile station apparatus, 4 Communication network, 5 Switching network, 6 Packet network, 21, 31, 41 Control part, 22, 32 Storage part, 23, 33 Wireless communication part, 24 Network interface unit, 70, 80 Transmission / reception unit, 71, 81 Modulation / demodulation unit, 72, 82 Data processing unit, 73, 83 Radio packet control unit, 74, 84 Radio control unit, 75 Additional allocation channel determination unit, 76 Additional allocation instruction unit 85, extension request channel determination unit, 86 extension request instruction unit, 90, 100 connection control unit, 91 link addition allocation activation unit, 92, 102 used channel monitoring unit, 93 link allocation availability determination unit, 94, 103 control channel control unit 95, 104 Communication channel control unit, 101 Link expansion request activation unit.

Claims (7)

Including a base station device and a mobile station device,
In the mobile communication system in which the mobile station device and the base station device communicate using at least one control channel and at least one communication channel.
Wherein depending on whether the mobile station apparatus and the prior SL base station apparatus is performing communication using a plurality of communication channels, sending a link channel assignment indicating a usable communication channel using a control channel Link channel allocation use channel selection means for selecting whether to transmit the link channel allocation using one communication channel of the plurality of communication channels;
In the base station apparatus, a link channel allocation transmitting means for transmitting the link channel assignment to the mobile station device using the channel selected by the link channel assignment using the channel selecting means,
In the mobile station apparatus, link channel assignment receiving means for receiving a link channel assignment transmitted by the link channel assignment transmitting means;
Communication in which communication is performed between the mobile station apparatus and the base station apparatus using a communication channel indicated by the link channel assignment in accordance with the link channel assignment transmitted by the link channel assignment transmitting unit. Means,
A mobile communication system comprising: The mobile communication system according to claim 1, wherein
A link channel allocation request indicating that a communication channel allocation is requested using a control channel according to whether or not the mobile station device and the base station device are communicating using a plurality of communication channels. Link channel allocation request using channel selection means for selecting whether to transmit the link channel allocation request using one communication channel of the plurality of communication channels;
In the mobile station apparatus, a link channel allocation request transmission means for transmitting the link channel assignment request to the base station device using the channel selected by the link channel assignment request using the channel selecting means,
In the base station apparatus, a link channel assignment request receiving means for receiving a link channel assignment request transmitted by the link channel assignment request sending means,
Further including
Wherein the link channel assignment transmission means, in response to said link channel assignment request received by the link channel assignment request receiving means, the link channel allocation using the channel selected by the link channel assignment using the channel selecting means Send,
A mobile communication system. The mobile communication system according to claim 1 or 2,
The link channel allocation transmission means transmits the link channel allocation as connectionless communication that does not tell in advance that a signal is transmitted to the mobile station device.
A mobile communication system. The mobile communication system according to claim 2, wherein
The link channel allocation request transmission means transmits the link channel allocation request as connectionless communication that does not convey in advance that a signal is transmitted to the base station device.
A mobile communication system. In a link control method for controlling a link in a mobile communication system in which a mobile station apparatus and a base station apparatus perform communication using at least one control channel and at least one communication channel,
Wherein depending on whether the mobile station apparatus and the prior SL base station apparatus is performing communication using a plurality of communication channels, sending a link channel assignment indicating a usable communication channel using a control channel A link channel assignment using channel selection step for selecting whether to transmit the link channel assignment using one communication channel of the plurality of communication channels;
In the base station apparatus, a link channel assignment transmission step of transmitting the link channel assignment to the mobile station device using the channel selected in the link channel allocation using channel selection step,
In the mobile station apparatus, a link channel assignment receiving step for receiving the link channel assignment transmitted in the link channel assignment sending step;
Communication in which communication is performed between the mobile station apparatus and the base station apparatus using a communication channel indicated by the link channel assignment according to the link channel assignment transmitted in the link channel assignment transmission step. Steps,
A link control method comprising: In a base station apparatus that performs communication using a mobile station apparatus, at least one control channel, and at least one communication channel,
Wherein depending on whether the mobile station apparatus and the prior SL base station apparatus is performing communication using a plurality of communication channels, sending a link channel assignment indicating a usable communication channel using a control channel Link channel allocation use channel selection means for selecting whether to transmit the link channel allocation using one communication channel of the plurality of communication channels;
A link channel assignment transmission means for transmitting the link channel assignment to the mobile station device using the channel selected by the link channel assignment using the channel selecting means,
Communication means for performing communication with the mobile station apparatus using the communication channel indicated by the link channel assignment according to the link channel assignment transmitted by the link channel assignment transmitting means;
A base station apparatus comprising: In a program for causing a computer to function as a base station apparatus that performs communication using a mobile station apparatus, at least one control channel, and at least one communication channel,
Wherein depending on whether the mobile station apparatus and the prior SL base station apparatus is performing communication using a plurality of communication channels, sending a link channel assignment indicating a usable communication channel using a control channel Link channel assignment using channel selection means for selecting whether to transmit the link channel assignment using one communication channel of the plurality of communication channels;
It said link channels transmitted by the link channel assignment channel used link channel assignment transmission means for transmitting the link channel assignment to the mobile station device using a channel that is selected by the selection means, and the link channel assignment transmission means Communication means for performing communication with the mobile station device using the communication channel indicated by the link channel assignment according to the assignment,
A program for causing the computer to function as:

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