KR20080045866A - Method and apparatus for transmitting and receiving of system information modification information - Google Patents

Abstract

A method and an apparatus for transceiving paging messages in a mobile communication system are provided to enable UE to combine the paging messages transmitted from cells belonging to the same node even when independent information by a cell instead of call information is included in the paging message and transmitted. A method for transmitting system information modification information comprises the following steps of: receiving paging information of idle UE(User Equipment)(305) from an upper node, and determining whether to include the system information modification information in a paging message in which the paging information will be received; and if so, configuring a paging message by including the paging information and the system information modification information, and transmitting the configured paging message to the UE.

Description

METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING OF SYSTEM INFORMATION MODIFICATION INFORMATION}

1 is a diagram illustrating an example of a structure of a next generation mobile communication system.

2 illustrates a problem of the prior art;

3 illustrates the overall operation of the present invention.

4 illustrates base station operation.

5 is a diagram illustrating a terminal operation.

6 shows a base station apparatus;

7 is a diagram illustrating a terminal device.

The present invention relates to a mobile communication system, and more particularly, to a method and apparatus for efficiently transmitting and receiving information that system information has been changed.

The Universal Mobile Telecommunication Service (UMTS) system is based on the European mobile communication system, Global System for Mobile Communications (GSM) and General Packet Radio Services (GPRS), and uses a wideband Code Division Multiple Access (hereinafter referred to as "UMTS"). Third generation asynchronous mobile communication system using " CDMA. &Quot;

The 3rd Generation Partnership Project (3GPP), which is in charge of UMTS standardization, is discussing Long Term Evolution (LTE) as the next generation mobile communication system of UMTS systems. LTE is a technology that implements high-speed packet-based communication of about 100 Mbps, aiming for commercialization in 2010. To this end, various schemes are discussed. For example, a scheme of reducing the number of nodes located on a communication path by simplifying a network structure, or approaching wireless protocols as close as possible to a wireless channel are under discussion.

1 illustrates an example of a structure of a next generation mobile communication system to which the present invention is applied. Here, the system structure based on the UMTS system is shown.

Referring to FIG. 1, as illustrated, the next-generation radio access network (hereinafter referred to as 'E-RAN') 110 and 112 may be an evolved Node B (hereinafter referred to as 'ENB' or 'Node B'). 120, 122, 124, 126, and 128, and the two-node structure of the anchor nodes 130 and 132. The user equipment (hereinafter referred to as 'UE') 101 is connected to the Internet Protocol (hereinafter referred to as 'IP') network by the E-RANs 110 and 112.

The ENBs 120 to 128 correspond to existing Node Bs of the UMTS system and are connected to the UE 101 by a wireless channel. Unlike the existing Node B, the ENBs 120 to 128 play a more complex role. In LTE, all user traffic, including real-time services such as Voice over IP (VoIP) over the Internet protocol, is serviced through a shared channel, which requires a device that collects and schedules UE information. 120 to 128 are in charge. One ENB typically controls a number of cells.

In order to achieve a transmission rate of up to 100 Mbps, LTE is expected to use Orthogonal Frequency Division Multiplexing (OFDM) as the radio access technology in the 20 MHz bandwidth. In addition, an adaptive modulation & coding (AMC) scheme that determines a modulation scheme and a channel coding rate according to the channel state of the UE will be applied.

On the other hand, the idle mode terminal does not have a traffic channel in the mobile communication system receives a paging message at regular intervals to check whether the call. In order for the network to send a call message to any idle mode terminal, the network must know the location of the terminal. However, tracking the location of an idle mode terminal in units of cells is not preferable in that a new registration message must be transmitted each time the terminal moves, and thus, a plurality of cells are bundled and used as a unit for tracking the location of an idle terminal. . For convenience of explanation, an area serving as a unit of location tracking of the idle terminal is referred to as a paging area. In UMTS, the paging area is also called a routing area. The idle mode terminal transmits a message for updating a location to the network only when the paging area changes, and when the network attempts to call the idle mode terminal, the idle mode terminal transmits a message to all cells belonging to the most recently reported paging area. A paging message containing an identifier of the terminal is broadcast. In other words, the same paging message is transmitted to all cells belonging to the paging area. Therefore, paging messages transmitted from cells under the control of the same base station include the same information, and thus can be combined for the paging message.

In general, the biggest difficulty of combining is to match the transmission timing between cells, and for this purpose, a complicated operation such as the UE needs to measure neighboring cell timing is required. However, in the case of cells belonging to the same base station, since one base station is responsible for the transmission, there is no difficulty in synchronizing the transmission timing. Therefore, in the LTE system, cells belonging to the same base station simultaneously transmit a paging message using a known transmission resource at a known timing, and the terminal combines paging messages received from cells belonging to the same base station.

The main purpose of the paging message is to convey call information to the idle mode terminal. Since the call information is always the same in cells belonging to the same paging area, combining of a paging message is possible. However, if information having different contents for each cell is stored in the paging message, combining of the paging message is impossible, and further, the combining leads to an increase in the interference signal.

Currently, the UMTS standard uses a paging message to transmit information that system information has been changed to idle mode terminals. This is to minimize the operation of the idle mode terminal, it is expected that the same scheme will be used in the next generation mobile communication such as LTE. However, since the information indicating that the system information has been changed is cell-independent information, when the paging message includes the change information about the system information, combining the paging messages rather than the reception success rate of the paging message is remarkable. There is a problem of lowering.

2 is a view for explaining the problems of the prior art.

Referring to FIG. 2, there is an arbitrary Node B 210 consisting of Cell 1 215, Cell 2 220, and Cell 3 225, and UE 205 is Cell 1 215. )

If a paging message is sent at the same time through the known transmission resources of Cell 1 215, Cell 2 220 and Cell 3 225, then from 215, Cell 2 220 and Cell 3 225 The paging message 230 transmitted contains the same information. Accordingly, the terminal 205 increases the success rate of paging message reception by combining the paging message.

If the system information of the cell 1 215 is changed at any point in time, the cell 1 215 transmits the change information on the system information in the paging message (235). As a result, the paging message 235 transmitted by the cell 1 215 is stored together with the paging information and system information modification info. Since only the paging information is stored in the paging message 240 transmitted from the cell 2 220 and the cell 3 225 at this time, the paging message 235 and cell 2, 3 (220, 225) transmitted from the cell 1 (215) The paging message 240 sent in the PB receives different information, and therefore, when these paging messages are combined with each other, the reception success rate is lowered.

In addition, after successfully decoding the paging message, the terminal can recognize whether the paging message has received independent information for each cell. However, if independent information for each cell is stored in the paging message, interference increases rather than combining, thereby reducing the possibility of successfully decoding the paging message. Therefore, in order to solve this problem, whenever a paging message is transmitted, whether or not the paging message is combined or not can be notified. However, this method causes a problem of introducing a new physical channel to transmit additional control information.

The present invention provides a method and apparatus for allowing a terminal to combine a paging message transmitted from cells belonging to the same base station even when the paging message includes cell-specific independent information rather than call information. It is.

According to a preferred embodiment of the present invention, in a mobile communication system, a base station transmits change information of system information to a terminal, wherein the paging information of an idle terminal is received from an upper node, and the paging message is stored in a paging message. Determining whether to include the system information change information; and when the system information change information is included, the paging message is configured to include the paging information and the system information change information, and the paging message is transmitted to the terminal. Process.

In addition, according to a preferred embodiment of the present invention, in a method for a terminal receiving change information of system information transmitted from a base station in a mobile communication system, the terminal selects a cell and receives system information of the cell to receive Acquiring an identifier and paging information, monitoring a transmission resource to which a paging message is transmitted using the acquired paging information, and changing cell identifier and system information change information from the paging message received through the transmission resource. Obtaining information; comparing the identifier of the cell acquired through the paging message with the identifier of the cell acquired through the system information; and if the comparison result matches, the system information according to the system information change information acquired through the paging message. It includes the process of updating.

In addition, according to a preferred embodiment of the present invention, in the mobile communication system for transmitting the change information of the system information to the terminal, the transmission device for transmitting the data transmitted from the upper layer for each cell and the system to be transmitted for each cell System information controllers for controlling the transmission apparatuses to store the information and to transmit the system information at a predetermined time point, paging information transmitted from an upper node, and system information changed information transmitted from the system information controllers; And a paging message transmission control unit configured to configure a paging message and to control the transmitting devices to transmit the paging message at the predetermined time point.

According to a preferred embodiment of the present invention, an apparatus for receiving change information of system information transmitted by a base station in a mobile communication system, the apparatus for receiving paging messages transmitted from the base stations, and the receiving device received A paging message that combines paging messages transmitted from cells managed by the same base station among paging messages, and a paging message that obtains system information change information included in the paging message by interpreting the paging message combined by the combiner. The processor compares the identifier of the cell to which the system information change information transmitted from the paging message processor is applied with the identifier of the cell where the terminal is currently located, and if so, receives the changed system information through the receiving apparatus and updates the system information. System Information Change Information Processing It includes parts.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

In the following description of the present invention, an LTE system evolved from a UMTS system is used as an example, but the present invention can be applied to all mobile communication systems to which a base station scheduling is applied without any addition or subtraction.

In the present invention, when transmitting independent information for each cell, a paging message including the independent information for each cell and an identifier of a cell to which the information is applied is transmitted in all cells belonging to the same base station. When the terminal recognizes the identifier of the cell in which it is located, and receives a paging message including cell-specific independent information, after checking the identifier of the cell to which the independent information for each cell is to be applied, the identifier of the cell where the cell identifier is currently located If is matched with the independent information per cell.

Figure 3 illustrates the overall operation according to an embodiment of the present invention.

Referring to FIG. 3, there is an arbitrary Node B 320 composed of Cell 1 315, Cell 2 320, and Cell 3 325, and the UE 305 restarts Cell 1 315 in step 327. Choose. Reselection of an arbitrary cell by the terminal 305 means that the system information of the cell is acquired and the paging message can be received from the cell.

The terminal 305 receives the system information of the cell 1 315 in step 329 to obtain information related to the timing and transmission resource to which the paging message is transmitted from the cell and the identifier of the cell. Also, for combining the paging message, information about a transmission resource to which the paging message is transmitted is acquired in cells belonging to the same Node B.

The cell ID may be configured as follows.

Cell ID = Node B ID + local cell ID

Node B ID is an identifier of a base station valid in a relatively large area and has a size of about tens of bits. The local cell ID is an identifier valid only in the base station and may have a small size of several bits.

The terminal, which reselects a specific cell and obtains a Cell ID of the cell, moves to a new cell and stores the obtained Cell ID until the Cell ID is updated.

Cell 1 315, cell 2 320, and cell 3 325 transmit the paging message 330 at a predetermined time using a predetermined transmission resource, and the terminal 305 transmits the cell 1 at the predetermined time. In operation 315, when the paging messages 330 are received from the cell 2 320 and the cell 3 325, the paging messages are combined. Since the paging messages contain only paging information, the contents of the messages are the same.

If the system information of the cell 1 315 is changed at any point in time, the base station 310 controls the system information change information to be stored in a paging message transmitted from the remaining cells whose system information has not changed among the cells managed by the base station 310. do. Thereafter, the system information modification info of the cell 1 315 is stored in the paging messages 335 to be transmitted from the cell 1 315, the cell 2 320, and the cell 3 325.

The system information change information of the cell 1 315 is information applied only to the cell 1 315, but the system information change information is also transmitted from the cell 2 320 and the cell 3 325 managed by the same base station 310. In addition, the terminal 305 may apply combining to the paging message including the system change information. In addition, there is no need to signal whether or not combining is applied to the paging message.

4 illustrates a base station operation according to an embodiment of the present invention.

Referring to FIG. 4, paging information, that is, calling information of any idle terminal, is transmitted by an upper node to a base station. When the base station receives the paging information from the higher node (405), it checks whether the system information change information should be included in the paging message in which the paging information is to be stored (410). In general, since the system information change information is continuously transmitted for a predetermined period, if the system information is changed in any cell before the predetermined period elapses, the system information change information is stored in the paging message and the process proceeds to step 420. do. On the other hand, if there is no need to store the system information change information in the paging message, the flow proceeds to step 415.

In step 415, the base station constructs a paging message for storing paging information. In step 425, the base station controls the cells to transmit the paging message through a predetermined transmission resource at a predetermined time.

In step 420, the base station configures a paging message for accommodating not only paging information but also system information change information and an identifier of a cell whose system information has been changed. In step 425, the base station transmits the paging message through a predetermined transmission resource at a predetermined time. To control the cells. In step 420, the base station may store a local cell id of the cell instead of the cell identifier.

5 illustrates an operation of a terminal according to an embodiment of the present invention.

Referring to FIG. 5, the terminal selects an arbitrary cell in step 505, and receives system information of the selected cell in step 510 to obtain an identifier and paging information of the cell. The paging information is information that the terminal needs to acquire in order to receive and combine a paging message in an arbitrary cell. For example, the paging information may be information on when a paging message is to be transmitted and information on transmission resources to which the paging message is to be transmitted.

In step 515, the terminal monitors the transmission resource to which the paging message is transmitted at a predetermined time using the paging information. In step 520, the UE receives a paging message through the transmission resource, checks the cell identifier and system information change information included in the paging message, and proceeds to step 525 the identifier of the cell accommodated in the paging message in step 510 Check if the identifier of the obtained cell matches. In other words, it checks whether the cell to which the system information change information is applied matches the cell selected by the user. If the cell identifiers match, the process proceeds to step 535. If the cell identifiers do not match, the process proceeds to step 530.

In step 530, the UE ignores the system information change information because the cell to which the system information change information is applied is not a cell selected by the UE. In step 535, since the cell to which the system information change information is applied is a cell selected by the terminal, the terminal updates the system information according to the system information change information.

6 shows a configuration of a base station apparatus according to an embodiment of the present invention.

Referring to FIG. 6, a base station apparatus according to an embodiment of the present invention may include a paging message transmission controller 605, transmission apparatuses 610, 615, and 620 configured for each cell and system information controllers for the cell-specific transmission apparatuses ( 625, 630, 635).

The paging message transmission control unit 605 configures the paging information delivered by the upper node into a paging message, and controls the cells to transmit the paging message at a predetermined time using a predetermined transmission resource.

The paging message transmission control unit 605 receives the system information change information from the system information control units 625, 630, and 635 configured for each cell, and configures a paging message for accommodating the system information change information. Is controlled to be transmitted using a predetermined transmission resource at a predetermined time point.

The transmission devices 610, 615, and 620 configured for each cell are devices for transmitting data transmitted from a higher layer for each cell.

The system information controllers 625, 630, and 635 configured for each cell store system information to be transmitted for each cell, and control the cell-specific transmission devices 610, 615, and 620 to be transmitted at a predetermined time. In addition, if the contents of the system information is changed, the paging message transmission control unit 605 notifies it.

7 illustrates a configuration of a terminal device according to an embodiment of the present invention.

Referring to FIG. 7, the terminal device includes a paging message processor 705, a combiner 710, a receiver 715, and a system information change information processor 720.

The receiving device 715 processes the signal received through the transmission resource to which the paging message is to be transmitted and delivers it to the combiner 710.

The combiner 710 combines the paging messages transmitted from the cells of the same base station and delivers the paging messages to the paging message processor 705.

The paging message processing unit 705 interprets the information of the paging message to determine whether to call. As a result of the determination, if the system information change information is stored in the paging message, the information is transmitted to the system information change information processor 720.

When the system information change information is received, the system information change information processor 720 compares the identifier of the cell to which the system information change information is applied with the identifier of the cell where the terminal is currently located. If the comparison indicates that the two identifiers match, it is recognized that the system information has been changed. Then, the system apparatus receives the changed system information at a predetermined time through the receiving device 715.

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.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention transmits a paging message including the identifier of a cell to which the information is to be applied to all cells belonging to the same base station, even when the paging message includes cell independent information rather than call information. The terminal may combine the paging message.

Claims (5)

In the mobile communication system, the base station transmits the change information of the system information to the terminal, Receiving paging information of an idle terminal from an upper node and determining whether to include the system information change information in a paging message to which the paging information is stored; And determining to include the system information change information, including the paging information and the system information change information, and constructing the paging message and transmitting the paging message to the terminal. The method of claim 1, The determining process, And if system information is changed in a cell before a predetermined period of time, determining to include the system information change information in the paging message. In the method for receiving a change information of the system information transmitted by the base station in the mobile communication system, Selecting, by the terminal, a cell and receiving system information of the cell to obtain an identifier and paging information of the cell; Monitoring a transmission resource to which a paging message is transmitted using the acquired paging information; Acquiring a cell identifier and system information change information from the paging message received through the transmission resource; Comparing the identifier of the cell acquired through the paging message with the identifier of the cell acquired through the system information; And updating the system information according to the system information change information acquired through the paging message if the comparison result is matched. An apparatus for transmitting change information of system information to a terminal in a mobile communication system, Transmission devices for transmitting data transmitted from an upper layer for each cell, System information controllers for storing system information to be transmitted for each cell and controlling the transmitters to transmit the system information at a predetermined time point; A paging message including a paging information transmitted from an upper node and system information change information transmitted from the system information controllers, and a paging message transmission control unit controlling the transmitting devices to transmit the paging message at the predetermined time point System information change information transmission device comprising a. An apparatus for receiving change information of system information transmitted from a base station in a mobile communication system, A receiving apparatus for receiving paging messages transmitted from base stations, A combiner for combining paging messages transmitted from cells managed by the same base station among paging messages received by the receiving apparatus; A paging message processing unit for analyzing the paging message combined by the combiner and acquiring system information change information included in the paging message; The system information change which updates the system information by receiving the changed system information through the receiving device by comparing the identifier of the cell to which the system information change information transmitted from the paging message processing unit is applied and the identifier of the cell where the terminal is present. System information change information receiving apparatus comprising an information processing unit.

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