KR20090060030A - Apparatus and method for multicasting control signal of a mible telecommunication system - Google Patents

Abstract

A multicasting device and a method thereof which a control of a mobile communication system is as a multicast control group are provided to use wireless resource between a base station and a mobile terminal efficiently by transmitting control signal to the terminal performing control operation. A controller(610) comprises user terminals performing the same control operation with a multicast control group among user terminals connected to the base station device. An allocation unit(620) assigns the multicast control channel to the group. A transmit unit(630) transmits the same control signal related to the control operation with user terminals belonging to the multicast control group by using the multicast control channel.

Description

Apparatus and method for multicasting control signals of mobile communication systems {APPARATUS AND METHOD FOR MULTICASTING CONTROL SIGNAL OF A MIBLE TELECOMMUNICATION SYSTEM}

The present invention relates to an apparatus and method for controlling a terminal belonging to a base station apparatus in a mobile communication environment, and more particularly, to an apparatus and method for multicasting the same control signal to a plurality of terminals belonging to the base station apparatus.

The mobile communication system includes a plurality of base stations and terminals belonging to each base station. Since a plurality of terminals move positions and transmit and receive data with the base station, the communication environment of the terminals is constantly changing over time. In order to transmit and receive data in a changing environment, various control operations must be performed in response to changes in the surrounding environment.

For example, when moving from the coverage of the first base station apparatus to the coverage of the second base station apparatus, handover control should be performed. In addition, when the state of the radio channel between the base station and the terminal changes, it is necessary to perform communication quality control to change the communication quality.

According to the related art, even when a plurality of terminals transmitting and receiving data to and from a specific base station perform the same control operation within the coverage of the specific base station apparatus, the base station apparatus transmits a control signal to each terminal. That is, the control operation is performed by transmitting a control signal to the first terminal to perform the control operation, and the control operation is performed by transmitting the control signal to the second terminal.

Since the same control signal or similar control information is transmitted to the plurality of terminals, respectively, the overhead of radio resources allocated between the base station apparatus and the terminal increases, and the control procedure is repeatedly performed. In addition, the service quality of the terminal is degraded due to the time delay according to the repeated control procedure.

In the case of performing the handover control, each terminal stays in the handover control state for a long time, thereby transmitting an interference signal to each base station apparatus, thereby degrading the performance of the mobile communication system.

According to the present invention, a plurality of terminals belonging to the base station apparatus are configured to perform the same control or terminals to be the same control as a group, and transmit control signals or control information to them at once to provide radio resources between the base station and the terminals. It aims to use effectively.

Another object of the present invention is to simplify the transmission of a control signal by transmitting control signals associated with a control operation to terminals at a time without sequentially controlling terminals to perform the same control among a plurality of terminals belonging to the base station apparatus. .

In order to achieve the above object and solve the problems of the prior art, the present invention comprises the steps of configuring a plurality of user terminals to perform the same control operation among the user terminals connected to the base station apparatus in a multicast control group, the configured multicast Assigning a multicast control channel to a control group, and transmitting the same control signal associated with the control operation to user terminals belonging to the multicast control group using the multicast control channel; It provides a control signal multicast method comprising.

According to one aspect of the present invention, receiving a subscription request message for a multicast control group from a base station apparatus, determining whether to perform a control operation associated with the multicast control group, the multicast control group according to the determination result Sending a subscription acknowledgment message for the terminal, and receiving a control signal associated with the control operation from the base station apparatus using a multicast control channel assigned to the multicast control group in response to the subscription acknowledgment message. A control signal receiving method is provided.

According to another aspect of the present invention, a control unit for configuring a plurality of user terminals to perform the same control operation among the user terminals connected to the base station apparatus in a multicast control group, a multicast control channel to the configured multicast control group Provided is a base station apparatus including an allocator for allocating, and a transmitter for transmitting the same control signal associated with the control operation to user terminals belonging to the multicast control group using the multicast control channel.

According to another aspect of the invention, the receiving unit for receiving a subscription request message for the multicast control group from the base station apparatus, a determination unit for determining whether to perform a control operation associated with the multicast control group, and according to the determination result And a transmission unit for transmitting a subscription confirmation message for the multicast control group, wherein the reception unit controls the control using a multicast control channel allocated to the multicast control group from the base station apparatus in response to the transmitted subscription confirmation message. A terminal is provided which receives a control signal associated with an operation.

According to the present invention, it is possible to effectively use radio resources between the base station and the terminal by transmitting a control signal associated with the control operation at a time to terminals which will perform the same control operation among a plurality of terminals belonging to the base station apparatus.

According to the present invention, a control signal associated with a control operation may be transmitted to a plurality of terminals belonging to the base station apparatus at once to simplify the transmission and control procedure of the control signal.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a conceptual diagram illustrating transmitting the same control signal using a multicast control channel to a plurality of user terminals that will perform the same control operation among user terminals connected to the base station apparatus according to the present invention. Hereinafter, transmission of a control signal using a multicast control channel will be described in detail with reference to FIG. 1.

The first terminal 102, the second terminal 103, the third terminal 132, and the fourth terminal 133 belong to the first base station apparatus 101. In addition, the fifth terminal 122, the sixth terminal 123, the seventh terminal 124, the eighth terminal 142, and the ninth terminal 143 belong to the second base station apparatus 121.

When a plurality of terminals 132 and 133 belonging to the first base station apparatus 101 need to hand over at the same time, the base station apparatus according to an embodiment of the present invention needs to hand over a plurality of terminals 132 and 133 at the same time. May be configured as the multicast control group 130. The base station apparatus assigns a multicast control channel 131 to the multicast control group 130 and associates the handover with a plurality of terminals 132 and 133 belonging to the multicast control channel using the assigned multicast control channel. The control signal can be transmitted.

The plurality of terminals 132 and 133 to perform the handover receive the control signal transmitted from the base station apparatus and perform the handover respectively. Since only one control signal may be transmitted to control the operations of the plurality of terminals 132 and 133, radio resources between the base station apparatus and the terminals 132 and 133 may be efficiently used.

The second base station apparatus 121 also configures the plurality of terminals 142 and 143 into the multicast control group 140 and allocates the multicast control channel 141 to perform the handover of the plurality of terminals 142 and 143. Can be controlled.

The multicast control channel transmits a control signal to all terminals belonging to the multicast control group using one common channel, so that the control signal associated with a specific terminal is controlled using the control channel assigned to each terminal. It is distinguished from a dedicated control channel for transmitting a.

The multicast control channel is also distinguished from the common control channel in that control signals are transmitted only to a plurality of terminals belonging to the multicast control group, not to all terminals within the coverage of the base station apparatus.

2 is a diagram illustrating a case in which a plurality of user terminals must simultaneously perform handover due to the establishment of a base station apparatus as an example of transmitting the same control signal to a plurality of user terminals according to the present invention.

The entire service area of the mobile communication system includes a first coverage 211 of the first base station apparatus 210, a second coverage 221 of the second base station apparatus 220, and a third coverage of the third base station apparatus 230 ( 231, and the fourth coverage 241 of the fourth base station apparatus 240. Each base station device 210, 220, 230, 240 communicates with terminals located within each coverage 211, 221, 231, 241. When the traffic of each base station apparatus 210, 220, 230, 240 increases, a fifth base station apparatus 250 may be additionally installed to reduce the traffic of each base station apparatus.

Since the terminal located in the coverage 251 of the fifth base station apparatus 250 communicates with the fifth base station apparatus 250, the coverages 211, 221, 231, and 241 of the other base station apparatuses 210, 220, 230, and 240 are used. Some of the terminals located within the device hand over to the fifth base station apparatus 250 to communicate with the fifth base station apparatus 250. As a result, the traffic of the other base station apparatuses 210, 220, 230, 240 is reduced.

In this case, since a plurality of terminals must be handed over at the same time, a group of a plurality of terminals to be serviced by the newly installed fifth base station can be grouped to simultaneously transmit handover control signals using the multicast control channel of the present invention. .

In FIG. 2, base station 5 may be arbitrarily installed regardless of traffic conditions of neighboring base stations.

3 is an example of transmitting the same control signal to a plurality of user terminals according to the present invention, when a plurality of user terminals to perform a handover at the same time due to the change of cell coverage (coverage) of each base station apparatus Figure is shown.

The entire service area of the mobile communication system includes a first coverage 311 of the first base station apparatus 310, a second coverage 321 of the second base station apparatus 320, and a third coverage of the third base station apparatus 330 ( 331, and the fourth coverage 341 of the fourth base station apparatus 340.

The data traffic of each of the base station apparatuses 310, 320, 330, and 340 is different according to the data traffic used by the terminals located in the respective coverages 311, 321, 331, and 341. When the data traffic of the first base station apparatus 310 and the fourth base station apparatus 340 increases, the first coverage 311 of the first base station apparatus 310 and the fourth coverage 341 of the fourth base station apparatus And reduce the second coverage 321 of the second base station apparatus 320 and the third coverage 331 of the third base station apparatus 330 to increase the data of each base station apparatus 310, 320, 330, 340. You can keep traffic equal to each other.

3 illustrates an exemplary embodiment in which the first coverage 351 of the first base station apparatus 350 is reduced 352 and the fourth coverage 361 of the fourth base station apparatus 360 is reduced 362. In this case, terminals located in the coverages 351 and 361 before the reduction but not in the coverages 352 and 362 after the reduction should be handed over to other base station devices.

Even in this case, a multicast control channel can be used to simultaneously hand over a plurality of terminals to a neighbor cell.

4 is a step-by-step method of allocating a multicast control channel and transmitting the same control signal to a plurality of user terminals connected to a base station apparatus using the allocated multicast control channel according to an embodiment of the present invention. One flowchart.

In operation S410, a subscription request message for a multicast control group is transmitted to a plurality of user terminals that will perform the same control operation among user terminals connected to the base station apparatus.

In step S420, a subscription confirmation message is received in response to the subscription request message sent in step S410. Although all terminals that have received the subscription request message in step S410 may transmit a subscription confirmation message, each terminal determines whether to receive a control operation associated with the subscription request message, and transmits the subscription confirmation message according to the determination result. Can be.

In step S430, a plurality of user terminals to perform the same control operation among user terminals connected to the base station apparatus are configured as a multicast control group. According to an embodiment of the present invention, only the user terminal that transmits the subscription confirmation message in step S420 may be configured as a multicast control group.

In operation S440, a multicast control group leave message may be received from a terminal belonging to the multicast control group. Even if a terminal transmits a subscription confirmation message to a multicast control group subscription request message, it may be impossible to perform a control operation associated with a multicast control signal due to a change in a communication environment. Terminals that are unable to perform the control operation may transmit a multicast control group leave message to the base station apparatus.

In step S450, terminals transmitting the multicast control group leave message are removed from the multicast control group. By removing the terminals that cannot perform the control operation according to the multicast control signal from the multicast control group, unnecessary procedures can be reduced in the process of confirming whether the control operation associated with the control signal has been performed.

Steps S440 and S450 may occur in other steps in addition to the above steps until the multicast control group is configured and then released.

In step S460, the multicast control channel is allocated to the multicast control group. The multicast control channel is a channel for the terminals belonging to the multicast control group to receive the multicast control signal. In order to distinguish the multicast control channel from other downlink channels, a specific time slot, a specific spreading code, or a specific beam that divides the coverage of a specific sub-carrier or base station into a plurality of areas is multicast. Can be assigned to a control channel.

In step S470, the control signal is transmitted to terminals belonging to the multicast control channel using the allocated multicast control channel.

According to an embodiment of the present invention, the control signal may be a handover control signal, a communication quality (Quality of Service) control signal, a communication configuration control signal, a communication routing control signal, and a security key distribution. It may include at least one of a control signal and a broadcasting control signal.

According to an embodiment of the present invention, when resetting communication quality parameters or bandwidths of terminals belonging to a specific class, the base station apparatus transmits communication quality parameters or control messages at once by configuring terminals belonging to a specific class into a multicast control group. Can be.

According to another embodiment of the present invention, when the communication setting of the mobile communication system is changed, the terminals affected by the changed communication setting may be configured as a multicast control group to transmit the changed communication setting information at once. The communication configuration information may be information of neighboring base station apparatus, handover information, QoS policy information, information on whether beamforming is performed, and the like.

In a multi-hop transmission network that transmits data via a plurality of relays, each terminal transmits data to a base station apparatus via a plurality of relays. When a failure occurs in one of the plurality of relays, it is necessary to change the data transmission path of all terminals transmitting data via the failed relay. According to an embodiment of the present invention, the base station apparatus may transmit a transmission path change information at a time by configuring a plurality of terminals to change the data transmission path into a multicast control group.

The terminals communicating with each base station apparatus may belong to different security groups according to the type of service to be used. For example, a terminal transmitting voice data may belong to a low security level security group, and a terminal transmitting financial information may belong to a high security group. According to another embodiment of the present invention, when changing a security group of terminals belonging to a specific security group to another security group, a plurality of terminals may be configured as a multicast control group and a security key distribution control signal may be transmitted at a time.

According to another embodiment of the present invention, when there is information to be delivered to a plurality of terminals using the same content or control is required, a broadcast control signal may be transmitted using a multicast control channel. For example, a plurality of terminals that receive a specific drama or news may be configured as a multicast control group, and a broadcast control signal for controlling to display information about the main actors of the specific drama on the screen may be transmitted at a time.

According to an embodiment of the present invention, the multicast control signal may be a handover control signal for instructing a terminal belonging to the multicast control group to hand over from the first base station apparatus to the second base station apparatus. In this case, the first base station apparatus may transmit information about terminals belonging to the multicast control group to the second base station apparatus. The second base station apparatus may perform handover quickly based on the information about the terminals received from the first base station apparatus. The first base station apparatus may receive handover information from the second base station apparatus and transmit handover information to each terminal through a multicast control channel. Each terminal may quickly hand over to the second base station apparatus based on the handover information. According to an embodiment of the present invention, the handover information received from the second base station apparatus may include access channel information for accessing the second base station. According to an embodiment of the present invention, the first base station apparatus may receive an operation success message or an operation failure message related to the handover result from the second base station apparatus.

Step S480 completes the control procedure for the multicast control group. In response to the control signal transmitted in step S470 from the terminals belonging to the multicast control group, an operation success message for a control operation associated with the control signal is received. The control using the multicast control group is completed by receiving the operation success message.

In step S490, the multicast control group is released. Releases the multicast control channel assigned to the multicast control group. According to an embodiment of the present invention, before releasing the multicast control group, the terminal transmitting the operation success message for the control operation is removed from the multicast control group and multiplied to the remaining terminals without being removed from the multicast control group. The cast control channel may be used to retransmit the multicast control signal.

FIG. 5 is a flowchart illustrating a method for receiving a control signal using a multicast control channel and performing a control operation associated with the received control signal according to an embodiment of the present invention. Occation).

In operation S510, a plurality of user terminals that perform the same control operation among the terminals connected to the base station apparatus receive a subscription request message for the multicast control group from the base station apparatus.

In step S520, each terminal receiving the subscription request message determines whether to perform a control operation associated with the multicast control group. The base station apparatus determines that the terminal should hand over from the first base station apparatus to the second base station apparatus and transmits a subscription request message for the multicast control group, but the terminal may determine that it is better not to hand over.

If it is determined that the control operation is not to be performed, in step S530, the multicast control group join rejection message may be transmitted to the base station apparatus. The base station apparatus may configure a multicast group except for the terminal that transmits the group join rejection message.

If it is determined that the control operation is to be performed, in step S540, the subscription confirmation message for the multicast control group may be transmitted. The base station apparatus may configure only the terminal that transmits the subscription confirmation message for the multicast control group as the multicast control group.

In step S550, the multicast control channel is allocated to the multicast control group in response to the subscription confirmation message for the multicast control group, and the multicast control signal transmitted using the multicast control channel is received. The multicast control signal is transmitted to all terminals belonging to the multicast control group. Since a plurality of terminals belonging to the multicast group receive only one control signal, the base station does not need to transmit control signals to each terminal. Since the control signal is transmitted only once instead of several times, it is possible to efficiently use radio resources between the base station apparatus and the terminal.

In operation S560, a control operation associated with the received control signal is performed. According to an embodiment of the present invention, the multicast control signal is a signal for controlling handover of a terminal belonging to the multicast control group, and the terminal belonging to the multicast control group may hand over from the first base station apparatus to the second base station apparatus. Can be.

The terminal receiving the control signal may determine whether it is possible to perform a control operation associated with the control signal, and transmit a multicast control group leave message to the base station according to the determination result. The base station may remove the terminal transmitting the multicast control group leave message from the multicast control group.

In operation S570, an operation success message for the control operation may be transmitted according to the result of performing the control operation associated with the control signal. The base station apparatus receiving the operation success message may remove the terminal that has successfully received the control operation from the multicast control group. If the control type is handover, the second base station may transmit an operation success message to the first base station on behalf of the terminals belonging to the multicast control group.

6 is a block diagram illustrating a structure of a base station apparatus for transmitting the same control signal using a multicast control channel to user terminals connected to the base station apparatus according to an embodiment of the present invention. Hereinafter, a structure of a base station apparatus according to the present invention will be described in detail with reference to FIG. 6. The base station apparatus 600 according to an embodiment of the present invention includes a controller 610, an allocation unit 620, a transmitter 630, and a receiver 640.

The controller 610 configures a plurality of user terminals to perform the same control operation among the user terminals connected to the base station apparatus in a multicast control group. The terminals belonging to the multicast control group receive the same multicast control signal and perform a control operation associated with the control signal.

According to an embodiment of the present invention, the control signal transmitted to the terminals belonging to the multicast control group includes a handover control signal, a quality of service control signal, a communication configuration control signal, and a communication route. It may include any one of a control signal, a security key distribution control signal, and a broadcasting control signal.

The allocator 620 assigns a multicast control channel to the multicast control group. In the multicast control channel, a special time slot, a spreading code, a sub-carrier or a beam, etc. may be allocated to distinguish it from other downlink channels.

The transmitter 640 transmits a control signal associated with a control operation to terminals belonging to the multicast control group by using the multicast control channel assigned to the multicast control group. When the multicast control group is not configured, the transmitter 640 may transmit N times to N terminals to receive the control signal.

According to an embodiment of the present invention, the transmitter 610 may transmit a subscription request message for the multicast control group to a plurality of user terminals that will perform the same control operation. The reception unit 640 receives a subscription confirmation message from some or all of the plurality of terminals receiving the subscription request message in response to the transmitted subscription request message, and the controller 610 confirms the subscription in response to the subscription request message. Only the terminal transmitting the message may be configured as a multicast control group.

According to an embodiment of the present invention, the receiving unit 640 receives a withdrawal message for a multicast control group from a plurality of user terminals, and the control unit 610 multicasts a terminal transmitting a withdrawal message in response to the withdrawal message. Can be removed from the control group.

According to an embodiment of the present invention, the transmitter 610 transmits or transmits a handover control signal indicating that the user terminal belonging to the multicast control group to hand over from the first base station apparatus to the second base station apparatus. The terminal may transmit information about user terminals belonging to the multicast control group to the second base station apparatus. The second base station apparatus may perform handover quickly based on information on user terminals belonging to the multicast control group. The receiver may receive handover information from the second base station apparatus. The handover information may include access channel information for accessing the second base station.

In addition, according to an embodiment of the present invention, the receiving unit 640 may receive an operation success message or an operation failure message related to the handover result from the second base station apparatus.

According to an embodiment of the present invention, the reception unit 640 receives an operation message for a control operation associated with the control signal from a terminal belonging to the multicast control group in response to the transmitted control signal, and the control unit 610 receives an operation success message. The terminal transmitting the UE may be removed from the multicast control group.

Since the ultimate purpose of configuring a multicast control group is to perform a control operation through transmission of a control signal, a terminal that achieves the purpose of forming a multicast control group by performing a control operation may be removed from the multicast control group. Can be.

Since only the terminal that has not performed the control operation remains in the multicast control group, the base station apparatus may retransmit the control signal using the multicast control channel assigned to the multicast control group.

7 is a block diagram illustrating a structure of a terminal for receiving a control signal from a base station apparatus using a multicast control channel and performing a control operation associated with the received control signal according to an embodiment of the present invention. Hereinafter, a structure of a terminal that performs a control operation associated with a control signal received using a multicast control channel will be described in detail with reference to FIG. 7. The terminal 700 according to the present invention includes a receiver 710, a determiner 720, and a transmitter 730.

The receiver 710 receives a subscription request message for a multicast control group. Since the multicast control channel for the multicast control group has not yet been allocated, the receiver 710 receives a subscription request message transmitted to each terminal.

The determination unit 720 determines whether to perform a control operation associated with the multicast control group. The base station apparatus 740 may determine that it is advantageous for the terminal receiving the subscription request message to perform a control operation associated with the multicast control group, and transmit the subscription request message. However, the UE may determine that it is not advantageous to perform the control operation associated with the multicast control group. In this case, the determination unit 720 may determine not to perform a control operation associated with the multicast control group.

If it is determined that the transmission unit 730 performs a control operation associated with the multicast control group, the transmission unit 730 transmits a subscription confirmation message for the multicast control group to the base station apparatus 740.

Upon receiving the subscription confirmation message, the base station apparatus 740 assigns a multicast control channel to the multicast control group. The reception unit 710 may receive a control signal associated with a control operation from the base station apparatus 740 using the multicast control channel assigned to the multicast control group in response to the subscription confirmation message.

According to an embodiment of the present invention, the determination unit 720 performs an operation according to the received control signal, and when the operation is successful, the transmitter 740 transmits an operation success message for the control operation to the base station apparatus 740. Can be sent to.

8 illustrates a method for transmitting a handover control signal using a multicast control channel to user terminals connected to a base station apparatus according to an embodiment of the present invention, and performing handover according to the received handover control signal. It is a flow chart showing step by step.

In step S831, a second base station apparatus adjacent to the first base station apparatus is newly installed. According to an embodiment of the present invention, when the data traffic of the first base station apparatus exceeds a predetermined threshold, a second base station apparatus is installed at a position adjacent to the first base station apparatus to distribute the data traffic of the first base station apparatus. Can be. Alternatively, the second base station apparatus may be installed without knowing the existence of the first base station apparatus or the traffic state.

In operation S832, among the plurality of terminals connected to the first base station apparatus, terminals that may communicate with the second base station apparatus may be configured as a multicast control group.

In steps S841, S842, and S843, a subscription request message for the multicast control group may be transmitted to respective terminals included in the multicast control group. Since the multicast control channel for the multicast control group is allocated, the subscription request message is transmitted to each of the terminals. As a result, the first base station apparatus 810 needs to transmit a subscription request message as many as the number of terminals.

In steps S844, S845, and S846, each terminal receiving the subscription request message may transmit a subscription confirmation message to the base station apparatus. 8 illustrates an embodiment in which all terminals transmit a subscription confirmation message. According to another embodiment of the present invention, each terminal receiving a subscription request message performs a control operation associated with a multicast control group. May be determined, and the multicast control group leave message may be transmitted according to the determination result. The base station apparatus receiving the multicast control group leave message may configure a multicast control group except for the corresponding terminal.

In step S851, the first base station apparatus 810 assigns a multicast control channel to the multicast control group. The first base station apparatus 810 transmits a scanning request message to a terminal belonging to the multicast control group by using the multicast control channel. Since the transmission is performed using the multicast control channel, the first base station apparatus 810 transmits the scanning request message once, and each of the terminals 821, 822, and 823 belonging to the multicast control group receives the same scanning request message. .

In operations S852 and S853, the terminals 821 and 822 receiving the scanning request message may transmit the scanning result to the first base station apparatus 810 in response to the scanning request message. According to an embodiment of the present invention, the scanning request message may include channel access information, scanning interval information, etc. of the second base station apparatus 811, and the terminals 821 and 822 that receive the scanning request message The signal transmitted from the second base station apparatus 811 may be detected by referring to the channel access information of the second base station apparatus 811. When the detection of the signal transmitted from the second base station apparatus 811 is successful, the terminals 821 and 822 may transmit the scanning result to the first base station apparatus 810.

Upon receiving the scanning request message, the terminal 823 may fail to detect a signal transmitted from the second base station apparatus 811. Since the terminal that fails to detect the signal can no longer perform the handover, it may transmit the multicast group leave message in step S854. Alternatively, if the signal detection is successful but it is determined that no handover is necessary, the multicast group leave message may be transmitted.

In operation S855, the terminal 823 which has transmitted the multicast control group leave message may be excluded from the multicast control group. In this case, only the terminals 821 and 822 are included in the multicast control group.

In operation S861, the first base station apparatus 810 may transmit information about terminals belonging to the multicast control group to the second base station apparatus 811 as multicast control group information. According to an embodiment of the present invention, the multicast control group information may include the number of terminals belonging to the multicast control group, a list, a state of each terminal, and the like.

In operation S862, the second base station apparatus 811 may transmit channel access information and handover information to the first base station apparatus 810. According to an embodiment of the present invention, the channel access information may include a state of the second base station apparatus, a channel access parameter, and whether handover can be performed for each terminal belonging to the multicast control group. The channel access information of the second base station apparatus may be transmitted to the first base station even before the handover group configuration.

In step S871, the handover control signal is transmitted to terminals belonging to the multicast control group using the multicast control channel. Although the first base station apparatus 810 transmits a control signal only once using a multicast control channel, each terminal belonging to the multicast control group receives the control signal.

In steps S872 and S873, each of the terminals 821 and 822 receiving the handover control signal performs a handover from the first base station apparatus 810 to the second base station apparatus 811.

In steps S874 and S875, the second base station apparatus 811 transmits a handover result to the first base station. The terminals 821 and 822 have already performed the handover and cannot transmit data to the first base station apparatus 811. The second base station apparatus 811 transmits a handover result to the first base station apparatus 810 on behalf of the first terminal 821 and the second terminal 822.

8 illustrates an embodiment in which each of the terminals 821 and 822 belonging to the multicast group succeeds in handover, but only some terminals belonging to the multicast group succeed in performing the control operation, and some terminals fail. You may.

In step 876, the terminals 821 and 822, which have received the operation success message, are removed from the multicast control group. According to an embodiment of the present invention, since the terminal that fails to perform the control operation does not receive the operation success message, it is not removed from the multicast control group. The first base station apparatus 810 may retransmit the handover control message using the multicast control channel assigned to the multicast control group.

8 illustrates an embodiment in which a handover control signal is transmitted as an example of the multicast control signal and the terminal which receives the handover control signal performs handover. However, according to another embodiment of the present invention, an access to a base station apparatus is performed. Any control signal may be transmitted using a multicast control channel as long as it is a control signal associated with a general control operation that some terminals of the plurality of terminals may perform.

The control method for the multicast control group according to the embodiment of the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium.

The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those skilled in the art. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. When all or part of the operation of the terminal or base station apparatus described in the present invention is implemented as a computer program, a computer readable recording medium storing the computer program is also included in the present invention.

1 is a conceptual diagram illustrating transmitting the same control signal using a multicast control channel to a plurality of user terminals that will perform the same control operation among user terminals connected to the base station apparatus according to the present invention.

2 is a diagram illustrating a case in which a plurality of user terminals must simultaneously perform handover due to the establishment of a base station apparatus as an example of transmitting the same control signal to a plurality of user terminals according to the present invention.

3 is an example of transmitting the same control signal to a plurality of user terminals according to the present invention, when a plurality of user terminals to perform a handover at the same time due to the change of cell coverage (coverage) of each base station apparatus Figure is shown.

4 is a step-by-step method of allocating a multicast control channel and transmitting the same control signal to a plurality of user terminals connected to a base station apparatus using the allocated multicast control channel according to an embodiment of the present invention. One flowchart.

5 is a flowchart illustrating a step-by-step method of receiving a control signal using a multicast control channel and performing a data operation associated with the received control signal according to an embodiment of the present invention.

6 is a block diagram illustrating a structure of a base station apparatus for transmitting the same control signal using a multicast control channel to user terminals connected to the base station apparatus according to an embodiment of the present invention.

7 is a block diagram illustrating a structure of a terminal for receiving a control signal from a base station apparatus using a multicast control channel and performing a control operation associated with the received control signal according to an embodiment of the present invention.

8 illustrates a method for transmitting a handover control signal using a multicast control channel to user terminals connected to a base station apparatus according to an embodiment of the present invention, and performing handover according to the received handover control signal. It is a flow chart showing step by step.

Claims (17)

Configuring a plurality of user terminals to perform the same control operation among user terminals connected to the base station apparatus in a multicast control group; Assigning a multicast control channel to the configured multicast control group; And Transmitting the same control signal associated with the control operation to user terminals belonging to the multicast control group using the multicast control channel. Control signal multicast method comprising a. The method of claim 1, wherein the control signal, Among handover control signal, quality of service control signal, communication configuration control signal, communication routing control signal, security key distribution control signal, and broadcasting control signal, At least one control signal multicast method. The method of claim 1, Transmitting a subscription request message for the multicast control group to the plurality of user terminals, respectively; More, Configuring the multicast control group, And only the user terminal that has transmitted the subscription confirmation message in response to the subscription request message is configured as the multicast control group. The method of claim 1, Receiving a multicast control group leave message from a first user terminal belonging to the multicast control group; And Removing the first user terminal from the multicast control group in response to the leave message; The control signal multicast method further comprising. The method of claim 1, The control signal includes a handover control signal for instructing a user terminal belonging to the multicast control group to handover from the base station apparatus to a second base station apparatus; The step of transmitting the control signal, Transmitting information about user terminals belonging to the multicast control group to the second base station apparatus; And Receiving handover information from the second base station; The control signal multicast method further comprising. The method of claim 1, Receiving an operation success message for the control operation from a first user terminal belonging to the multicast control group in response to the transmitted control signal; And Removing the first user terminal from the multicast control group Control signal multicast method comprising a. Receiving a subscription request message for a multicast control group from a base station apparatus; Determining whether to perform a control operation associated with the multicast control group; Transmitting a subscription confirmation message for the multicast control group according to the determination result; And Receiving a control signal associated with the control operation from the base station apparatus using the multicast control channel assigned to the multicast control group in response to the subscription confirmation message; Control signal receiving method comprising a. The method of claim 7, wherein Performing the control operation; And Transmitting an operation success message for the control operation according to a result of performing the control operation; The control signal receiving method further comprises. A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 1 to 8. A control unit for configuring a plurality of user terminals to perform the same control operation among user terminals connected to the base station apparatus in a multicast control group; An allocator for allocating a multicast control channel to the configured multicast control group; And Transmitter for transmitting the same control signal associated with the control operation to the user terminals belonging to the multicast control group using the multicast control channel Base station device comprising a. The method of claim 10, wherein the control signal, At least one of a handover control signal, a quality of service control signal, a communication configuration control signal, a communication routing control signal, a security key distribution control signal, and a broadcasting control signal Base station apparatus comprising a. The method of claim 10, The transmitter transmits a subscription request message for the multicast control group to a plurality of user terminals, respectively. Receiving unit for receiving a subscription confirmation message from the plurality of user terminals in response to the transmitted subscription request message More, The control unit, And only a user terminal that has transmitted a subscription confirmation message in response to the subscription request message is configured as the multicast control group. The method of claim 10, Receiving unit for receiving the multicast control group leave message from the first user terminal belonging to the multicast control group More, And the controller is configured to remove the first user terminal from the multicast control group in response to the withdrawal message. The method of claim 10, The control signal includes a handover control signal for instructing a user terminal belonging to the multicast control group to handover from the base station apparatus to a second base station apparatus; The transmitter transmits information about user terminals belonging to the multicast control group to the second base station apparatus. And the receiving unit receives the handover information from the second base station apparatus. The method of claim 10, Receiving unit for receiving an operation success message for the control operation from the first user terminal belonging to the multicast control group in response to the transmitted control signal More, And the control unit removes the first user terminal that has transmitted the operation success message from the multicast control group. A receiving unit for receiving a subscription request message for a multicast control group from a base station apparatus; A determination unit to determine whether to perform a control operation associated with the multicast control group; And A transmitter for transmitting a subscription confirmation message for the multicast control group according to the determination result Including And the receiving unit receives a control signal associated with the control operation from the base station apparatus using a multicast control channel assigned to the multicast control group in response to the transmitted subscription confirmation message. The method of claim 16, The determination unit performs an operation according to the control signal, And the transmitter transmits an operation success message for the control operation according to a result of performing the operation.

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