KR100958929B1 - Dynamic Scheduling Method and Device in Cell Broadcasting Service - Google Patents

Abstract

The present invention relates to a method for scheduling a transmission period of a message for a cell broadcast service in a mobile communication system. The present invention relates to determining whether a cell broadcast request including a cell broadcast message is received and to scheduling a message according to whether the cell broadcast request is received. Dynamically sets the transmission period. At this time, the transmission period of the scheduling message after the cell broadcast request is received is set shorter than the transmission period before the cell broadcast request is received.

Cell broadcast service, dynamic, scheduling

Description

Method and apparatus for dynamic scheduling in cell broadcast service {Method and system for dynamic scheduling at Cell Broadcast Service}

The present invention relates to a dynamic scheduling method and apparatus for discontinuous reception of a mobile communication terminal in a cell broadcast service.

With the development of mobile communication technology, various functions such as internet access, games, message transmission, email transmission, and financial transactions can be used as well as voice calls using mobile communication terminals. In particular, a short message service (SMS) or a voice message service (VMS) capable of delivering a text message or a voice message to a counterpart among mobile communication services provided through a mobile communication terminal is widely used.

Among these short message services, a cell broadcast service is a unidirectional message service that transmits cell broadcast messages to mobile communication terminals of a specific region or to a mobile communication terminal of a specific group at one time. In this case, the cell broadcast message includes cell broadcast data such as a traffic condition message and a disaster notification message.

Conventionally, battery usage of a mobile communication terminal can be reduced by using a scheduling message for facilitating reception of a cell broadcast message of the mobile communication terminal in a cell broadcast service.

Specifically, the scheduling message includes transmission time of the current scheduling message and frame offset information between the current scheduling message and the next scheduling message to be received. The scheduling message includes length information of a cell broadcast message to be transmitted later. Accordingly, the mobile communication terminal receiving the scheduling message uses the frame offset information of the scheduling message to discontinuously receive a channel for another service or to switch to the idle mode during the data frame in which the cell broadcast message or the scheduling message is not transmitted. DRX: Discontinuous Reception (DRX) function can be performed.

However, in the conventional cell broadcasting service, a fixed scheduling method is used in which a scheduling message is transmitted to a mobile communication terminal every predetermined period. In this case, the larger the frame offset value between the scheduling messages, the greater the effect of reducing the battery usage of the mobile communication terminal. However, when the frame offset value of the scheduling message is increased, a cell broadcast message reception delay of the mobile communication terminal increases. On the other hand, when the frame offset value of the scheduling message is made smaller, the battery usage of the mobile communication terminal cannot be reduced efficiently.

Accordingly, an aspect of the present invention is to provide a scheduling method and an apparatus for the same in a cell broadcast service capable of reducing battery usage of a mobile communication terminal in a cell broadcast service and minimizing a reception delay of a cell broadcast message. To provide.

In order to achieve the above-described problem, a method of scheduling a transmission period of a message for a cell broadcast service in a mobile communication system according to an aspect of the present invention includes determining whether to receive a cell broadcast request including a cell broadcast message. And dynamically setting a transmission period of a scheduling message according to whether the cell broadcast request is received. At this time, the transmission period of the scheduling message after the cell broadcast request is received is set shorter than the transmission period before the cell broadcast request is received.

In addition, the apparatus for scheduling the transmission period of the message for the cell broadcast service in the mobile communication system according to another aspect of the present invention, the dynamic scheduler unit for setting the transmission period of the scheduling message differently according to whether or not to receive the cell broadcast message to be transmitted; And a cell broadcast processor configured to broadcast a scheduling message and the cell broadcast message according to a transmission period set by the dynamic scheduler.

According to the embodiment of the present invention, the battery usage of the mobile communication terminal can be efficiently reduced by dynamically scheduling the transmission period of the scheduling message according to the presence or absence of the cell broadcast message to be transmitted in the cell broadcast service. In addition, the reception delay of the cell broadcast message can be reduced.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.

In addition, the terms “… unit”, “… unit”, “module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of a mobile communication system provided with a cell broadcast service according to an embodiment of the present invention.

As shown in FIG. 1, a mobile communication system provided with a cell broadcast service according to an embodiment of the present invention includes a plurality of mobile communication terminals 100, a radio network sub-system (RNS) 200, and a core network. (Core Network: CN) 300. In this case, in FIG. 1, a plurality of mobile communication terminals 100 included in one cell are indicated by one reference numeral.

The mobile communication terminal 100 receives a cell broadcast message provided from the core network 300 through the wireless network subsystem 200. At this time, the mobile communication terminal 100 receives a message related to a cell broadcast service through the wireless network subsystem 200 and a radio access interface protocol.

At this time, the mobile communication terminal 100 according to an embodiment of the present invention checks the transmission time of the cell broadcast message using the scheduling message received according to two or more periods.

The wireless network subsystem 200 transmits a scheduling message including the cell broadcast message and scheduling information of the cell broadcast message transmitted from the core network 300 to the mobile communication terminal 100. In this case, the wireless network subsystem 200 includes a radio network controller (RNC) 210 and at least one base station (node-B) 220 managed by the radio network controller 210.

The radio network controller 210 manages a plurality of base stations 220 and schedules and broadcasts a cell broadcast message transmitted from the core network 300. The wireless network controller 210 schedules a transmission time of the scheduling message including the scheduling information of the cell broadcast message and transmits it to the mobile communication terminal 100.

At this time, the radio network controller 210 according to the embodiment of the present invention dynamically schedules the transmission time of the scheduling message. Specifically, the wireless network controller 210 sets a frame offset between scheduling messages differently depending on whether there is a cell broadcast message to be transmitted or not. In this case, the wireless network controller 210 schedules a frame offset value between scheduling messages shorter when there is a cell broadcast message to be transmitted than when there is no cell broadcast message to be transmitted.

The core network 300 includes a cell broadcast center (CBC) 310 that provides cell broadcast service data. The core network 300 is a switching station (not shown), a home location register (not shown), and a packet switching support node (SGSN) for supporting a packet switching service to a mobile communication terminal 100. Support Node (not shown), and Gateway GPRS Support Node (GGSN) (not shown), and the like. At this time, in Figure 1 for convenience of description, a detailed description of the configuration and operation of the core network 300 for providing a general mobile communication service will be omitted.

The cell broadcast center 310 performs a scheduling function of a cell broadcast message as a node of the core network 300. That is, the cell broadcast center 310 constructs a cell broadcast message including valid cell broadcast data (traffic conditions, disaster notification, weather information data, etc.), and wirelessly transmits a cell broadcast request message including the cell broadcast message according to scheduling. Transfer to the network subsystem (200).

In this case, the cell broadcast center 310 may schedule a cell broadcast message transmission time to the wireless network subsystem 200 by referring to a length of a cell broadcast message to be transmitted currently and a transmission time of a previous cell broadcast message. The cell broadcast message includes cell broadcast data, transmission request timing information, transmission region information, and the like.

2 is a diagram illustrating a configuration of a dynamic scheduling apparatus for providing a cell broadcast service according to an embodiment of the present invention.

3A to 3C are data frame mapping diagrams for describing a dynamic scheduling method according to an embodiment of the present invention, respectively.

2 shows that the dynamic scheduling apparatus according to the embodiment of the present invention belongs to the radio network controller 210. However, the present invention is not limited thereto, and the dynamic scheduling apparatus may be included in another configuration of the mobile communication system, and the dynamic scheduling apparatus may be configured alone.

As shown in FIG. 2, the dynamic scheduling apparatus includes a scheduling request processor 211, a dynamic scheduler 212, a cell broadcast processor 213, and a database 214.

The scheduling request processor 211 receives a cell broadcast request message including a cell broadcast message from the cell broadcast center 310 and performs a transmission time scheduling for transmitting the received cell broadcast message to the mobile communication terminal 100. Request to section 212.

At this time, the scheduling request processor 211 checks length information of the received cell broadcast message, a transmission request time point, transmission region information, and the like. Thereafter, the scheduling request processor 211 stores the cell broadcast message in the database 214, and then sends the scheduling request including the length information of the cell broadcast message, transmission request timing information, and transmission region information to the dynamic scheduler 212. To pass.

The dynamic scheduler 212 dynamically schedules a period of transmitting the scheduling message to the mobile communication terminal 100 according to the presence or absence of a cell broadcast message to be transmitted. At this time, the dynamic scheduler 212 schedules the transmission period of the scheduling message when there is a cell broadcast message to be shorter than the transmission period when there is no cell broadcast message to be transmitted.

In detail, when there is no scheduling request received from the scheduling request processor 211, the dynamic scheduler 212 sets a period for transmitting a scheduling message to the mobile communication terminal 100 as a first period. The dynamic scheduler 212 transfers the broadcast request message including the first period information to the cell broadcast processor 213.

At this time, in the embodiment of the present invention, although the first period is represented as a fixed period, the first period value may be set to at least one value that can reduce the battery usage of the mobile communication terminal 100. That is, by applying the transmission period of the scheduling message to the first period having at least one period value, the reception delay of the cell broadcast message can be reduced than when the first period value is fixedly operated.

The dynamic scheduler 212 sets the transmission period of the scheduling message to a second period shorter than the first period when receiving the scheduling request from the scheduling request processor 211. The dynamic scheduler 212 transfers the broadcast request message including the second period information and the length information of the cell broadcast message to the cell broadcast processor 213.

Meanwhile, when the scheduling request processor 211 receives the scheduling request from the scheduling request processor 211, the dynamic scheduler 212 determines whether the next scheduling request is received for a predetermined period after all the cell broadcast messages to be transmitted are transmitted. In this case, the dynamic scheduler 212 sets a cycle of the next scheduling message as a third cycle to determine reception of the next scheduling request for a predetermined time from the time when the cell broadcast message is transmitted. The dynamic scheduler 212 transmits a broadcast request message including the third period information to the cell broadcast processor 213. In this case, the third period may be set to be the same as the second period.

 Thereafter, the dynamic scheduler 212 sets the transmission period of the scheduling message as the first period when the next scheduling request is not received for a predetermined time after all cell broadcast messages have been transmitted. The dynamic scheduler 212 transfers the broadcast request message including the first period information to the cell broadcast processor 213.

Hereinafter, for convenience of description, a broadcast request message including first period information, second period information, and third period information, respectively, may be referred to as 'first broadcast request message', 'second broadcast request message', and 'third broadcast request message'. It is called.

The cell broadcast processor 213 broadcasts the scheduling message and the cell broadcast message to the plurality of mobile communication terminals 100 through the base station 220 according to the broadcast request message received from the dynamic scheduler 212. At this time, the cell broadcast processor 213 maps the scheduling message and the cell broadcast message to the data frame according to the period information included in the received broadcast request message and transmits the mapping message to the base station 220.

In detail, when the first broadcast request message is received, the cell broadcast processor 213 maps the scheduling message to the data frame every first period and transmits the scheduling message to the base station 220.

For example, when the first broadcast request message is received, the cell broadcast processor 213 maps the scheduling message to the data frame according to the first period as shown in FIG. 3A. 3A shows that the first period value is eight. That is, when a common traffic channel (CTCH) to which scheduling message data is to be transmitted is mapped to a physical channel (S-CCTCH), each logical channel is referred to as a system frame number (hereinafter referred to as 'SFN'). ) Is 2, 10, 18, 26, 34.

In addition, when receiving the second broadcast request message, the cell broadcast processor 213 maps the scheduling message according to the second period to the data frame as shown in FIG. 3B. In FIG. 3B, the second period value is 6.

For example, FIG. 3B illustrates that the cell broadcast processing unit 213 receives a second broadcast request message while mapping and transmitting a scheduling message to SFNs 2 and 10 in the first period according to the first broadcast request message.

As such, when the cell broadcast processing unit 213 receives a second broadcast request message after mapping and transmitting a scheduling message to SFN 2, the scheduling message mapped to SFN 2 already includes first period information. That is, the cell broadcast processor 213 may not schedule the cell broadcast message to the scheduling message mapped to the SFN 10.

Accordingly, the cell broadcast processor 213 maps the scheduling message transmitted next to SFN 10 to SFN 16 according to a second period and transmits the mapping message. At this time, the scheduling message mapped to SFN 10 includes second period information. The scheduling message mapped to SFN 16 includes second period information and broadcast information. Here, the broadcast information is scheduling information on a cell broadcast message to be transmitted after a scheduling message mapped next to SFN 16. That is, the cell broadcast processing unit 213 maps the scheduling message including the second period information and the scheduling information for the cell broadcast message to the SFN 16, and the cell broadcast message after the scheduling message mapped to the SFN 22 according to the second period. Map and send

As such, the cell broadcast processor 213 transmits the scheduling message at a second period after the scheduling message mapped to the SFN 10 to have a shorter offset value between the scheduling messages. The cell broadcast processing unit 213 transmits scheduling information about the actual cell broadcast message to the terminal when scheduling the SFN 16 and maps the scheduling message to the SFN 22 according to the second period, thereby receiving a reception delay of the next cell broadcast message. Decreases.

At this time, the cell broadcast processing unit 213 maps and transmits a scheduling message including period information and an offset value determined according to the length of the cell broadcast message to be transmitted to SFN 16. In this case, the cell broadcast processor 213 may refer to the length information of the cell broadcast message included in the second broadcast request message received from the dynamic scheduler 212. In addition, the cell broadcast processor 213 may refer to data length information of the cell broadcast message stored in the database 214.

The cell broadcast processor 213 allocates a CTCH according to the length of the cell broadcast message to map the cell broadcast message after a predetermined frame after the scheduling message mapped to the SFN 22 is transmitted. In this case, FIG. 3B shows that the cell broadcast message is transmitted over frames from SFN 24 to SFN 27. Accordingly, the cell broadcast processor 213 maps a scheduling message including an offset value having an offset value greater than 6 to SFN 22.

In detail, the cell broadcast processor 213 maps and transmits a cell broadcast message after a predetermined frame of SFN 22. In FIG. 3B, the cell broadcast processor 213 sets the frame offset value between the scheduling message and the cell broadcast message to 2 and maps the CTCH for transmitting the cell broadcast message to the SFN 24. After all cell broadcast messages have been transmitted, an offset value from the next scheduling message is set to 2 to indicate that the next scheduling message is mapped to SFN 29.

3B and 3C to be described later, the data of the cell broadcast message are transmitted over four broadcast message blocks. In addition, in FIG. 3B and FIG. 3C to be described below, the logical channel through which the scheduling message is transmitted is represented by 'CTCH_1', and the logical channel through which the cell broadcast message is transmitted is represented by 'CTCH_2'.

In this case, the cell broadcast processor 213 may acquire data of the cell broadcast message stored in the database 214 and map the data to the data frame.

On the other hand, when the second broadcast request message is not received for a predetermined period from the time when the second broadcast request message is received and then the cell broadcast message is transmitted, the cell broadcast processing unit 213 receives a third message from the dynamic scheduler 212. Receive a broadcast request message.

In this case, the cell broadcast processor 213 maps a logical channel for transmitting the scheduling message including the third period information to the data frame. Then, the cell broadcast processor 213 receives the first broadcast request message from the dynamic scheduler 212 during the third period and maps a logical channel for transmitting the scheduling message including the first period information to the data frame.

For example, the cell broadcast processing unit 213 that receives the third broadcast request message may have a frame offset value (ie, the scheduling message and the cell between the scheduling message immediately before the cell broadcast message is transmitted and the next scheduling message, as shown in FIG. 3C). The offset value between the broadcast message + the cell broadcast message block value + the offset value between the broadcast message and the next scheduling message) is set to 7. That is, the scheduling message mapped to SFN 22 shown in FIG. 3C includes specific period information. Here, the specific period information indicates a frame offset value (ie, 7) according to the length information of the cell broadcast message.

Then, after the cell broadcast message is transmitted, the cell broadcast processor 213 maps the logical channel for transmitting the scheduling message including the third period information (same as the second period in FIG. 3C) to SFN 29. In this case, the cell broadcast processing unit 213 that receives the first broadcast request message after a predetermined period of time in which the cell broadcast message is transmitted (that is, there is no next cell broadcast message to be transmitted), the cell broadcast processing unit 213 includes a scheduling message including the first period information in the SFN 35. Map logical channels to transmit.

Thereafter, the cell broadcast processor 213 transmits the scheduling message according to the first period until the second broadcast request message is received. That is, as shown in FIG. 3C, a logical channel for transmitting the next scheduling message is mapped to SFN 43.

The database 214 sequentially stores the cell broadcast message delivered from the scheduling request processor 211. The database 214 sequentially outputs a cell broadcast message to be transmitted in response to a request of the cell broadcast processor 213.

Hereinafter, a method of dynamically scheduling a time point at which a dynamic scheduling apparatus transmits a scheduling message to a plurality of mobile communication terminals 100 will be described with reference to FIG. 4.

4 is a flowchart illustrating a dynamic scheduling method according to an embodiment of the present invention.

First, the dynamic scheduling apparatus determines whether there is a cell broadcast request message received (S500). In this case, the cell broadcast request message is received from the cell broadcast center 310 and includes a cell broadcast message including cell broadcast data, a broadcast request time point and broadcast request region information.

As a result of the determination, when there is a cell broadcast request message received, the dynamic scheduler device transmits a scheduling message including the second period information (S510). In this case, the second period is shorter than the scheduling message transmission period (that is, the first period) when there is no cell broadcast request message.

The dynamic scheduler device transmits a scheduling message including specific period information (S520). At this time, the dynamic scheduler device transmits a scheduling message including specific period information after the second period period elapses. Here, the specific period is set according to the length information of the cell broadcast message to be transmitted later.

Thereafter, the dynamic scheduler device transmits a cell broadcast message (S530).

Then, the dynamic scheduler device determines whether there is a cell broadcast request message received for a predetermined time after cell broadcast message transmission (S540). At this time, the dynamic scheduler device determines whether there is another cell broadcast message received from the cell broadcast center 310 for a predetermined time from the transmission time of the cell broadcast message.

 As a result of the determination, when there is a received cell broadcast message, the dynamic scheduler returns to step S520 to perform a subsequent step.

In addition, when there is no cell broadcast message received as a result of the determination of step S540, the dynamic scheduler device transmits a scheduling message including the third period information (S550).

After the third period elapses, the dynamic scheduler device transmits a scheduling message including the first period information (S560). In this case, the first period may be set to at least one value as a period longer than the second period.

On the other hand, if there is no cell broadcast request message received as a result of the determination in step S500, the dynamic scheduler device performs step S560 to transmit the scheduling message according to the first period.

In the embodiment of the present invention, it is shown that the scheduling method is applied to the cell broadcast service described above to a plurality of mobile communication terminals included in one cell. However, the present invention is not limited thereto, and the scheduling method may be applied to the above-mentioned cell broadcast service to a mobile communication terminal included in a specific region or a specific group.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a schematic block diagram of a mobile communication system provided with a cell broadcast service according to an embodiment of the present invention.

2 is a diagram illustrating a configuration of a dynamic scheduling apparatus for providing a cell broadcast service according to an embodiment of the present invention.

3A to 3C are data frame mapping diagrams for explaining a dynamic scheduling method according to an embodiment of the present invention.

4 is a flowchart illustrating a dynamic scheduling method according to an embodiment of the present invention.

Claims (11)

A method for scheduling a transmission period of a message for a cell broadcast service in a mobile communication system, Determining whether to receive a cell broadcast request including a cell broadcast message; And Dynamically setting a transmission period of a scheduling message according to whether the cell broadcast request is received; The transmission period of the scheduling message is set so that the second transmission period after the cell broadcast request is received is shorter than the first transmission period before the cell broadcast request is received. Dynamic Scheduling Method in Cell Broadcasting Service. The method of claim 1, After dynamically setting a transmission period of the scheduling message, Broadcasting a scheduling message including the dynamically set transmission period information Dynamic scheduling method in a cell broadcast service further comprising. The method of claim 2, If the cell broadcast request is received, after broadcasting the scheduling message,  Broadcasting the cell broadcast message after broadcasting a next scheduling message including specific period information; And Setting a transmission period of a next scheduling message to a first transmission period before a cell broadcast request is received if the next cell broadcast request is not received for a predetermined time after broadcasting the cell broadcast message. Dynamic scheduling method in a cell broadcast service further comprising. The method of claim 3, The specific period information, Is generated using length information of the cell broadcast message. Dynamic Scheduling Method in Cell Broadcasting Service. The method of claim 1, The first transmission period may be set to at least one period value Dynamic scheduling method in a cell broadcast service, characterized in that. An apparatus for scheduling a transmission period of a message for a cell broadcast service in a mobile communication system, A dynamic scheduler configured to set a transmission cycle of a scheduling message differently according to whether a cell broadcast message to be transmitted is received; And A cell broadcast processor for broadcasting a scheduling message and the cell broadcast message according to a transmission period set by the dynamic scheduler. Dynamic scheduling apparatus in a cell broadcast service comprising a. The method of claim 6, The dynamic scheduler unit, If the cell broadcast request is received, setting the transmission period of the scheduling message so that the second transmission period after the cell broadcast request is received is set to be shorter than the first transmission period before the cell broadcast request is received. Dynamic scheduling apparatus in cell broadcast service. The method of claim 7, wherein The dynamic scheduler unit, If a cell broadcast message to be transmitted next is not received for a predetermined time after the cell broadcast message is broadcast, the transmission period of the scheduling message is set to a first transmission period before the cell broadcast request is received. Dynamic scheduling apparatus in cell broadcast service. The method of claim 6, A scheduling request processor which receives a cell broadcast request including the cell broadcast message from the outside and requests scheduling from the dynamic scheduler; And A database for sequentially storing the cell broadcast messages received by the scheduling request processor and outputting the cell broadcast message according to a request of the cell broadcast processor Dynamic scheduling apparatus in a cell broadcast service further comprising. The method of claim 7, wherein The cell broadcast processing unit, After broadcasting the scheduling message set to the second transmission period, Broadcasting a next scheduling message including specific period information generated using the length information of the cell broadcast message; Dynamic scheduling apparatus in cell broadcast service. The method of claim 7, wherein The dynamic scheduler unit, And at least one period value is set as a value of the first transmission period.

Images