KR20090083886A - Method of transmitting and receiving control information in a mobile communications system - Google Patents

Abstract

A method of transmitting and receiving control information in a mobile communication system is provided to simplify the operation of a mobile terminal and efficiently use a terminal resource. A wireless communication system transmits indication information informing the transmission of the control information to a mobile terminal through a control channel. The wireless communication system transmits the control information indicated by the indication information to the mobile terminal. The indication information includes scheduling information of the control information, and transmits every first cycle.

Description

Method of transmitting and receiving control information in a mobile communications system

The present invention relates to a wireless mobile communication system. More specifically, the present invention relates to a method for transmitting and receiving control information in a wireless mobile communication system.

1 is a diagram illustrating a network structure of an Evolved Universal Mobile Telecommunications System (E-UMTS). The E-UMTS system is an evolution from the existing UMTS system and is currently undergoing basic standardization in 3GPP.

The E-UMTS network mainly performs a user equipment (UE), a base station (hereinafter referred to as Node B), a control plane server (hereinafter, abbreviated as 'CPS') and performs radio resource management. Located at the end of the Radio Resource Management (hereinafter referred to as RRM), the Mobility Management Entity (hereinafter referred to as 'MME') and the E-UMTS network. Is configured as an Access Gateway (hereinafter, abbreviated as 'AG') connected to an external network. One or more cells exist in one Node B.

Layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. L2 (second layer), L3 (third layer) can be divided into, the physical layer belonging to the first layer of the above provides an information transfer service (Information Transfer Service) using a physical channel (Physical Channel), The radio resource control layer (hereinafter, referred to as 'RRC') layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the UE and the network. The RRC layer may be located in a distributed function in Node B, CPS / RRM, MME.

FIG. 2 illustrates a structure of a radio interface protocol between a terminal and a UMTS Terrestrial Radio Access Network (UTRAN) based on the 3GPP radio access network standard. The air interface protocol of FIG. 2 is composed of a physical layer, a data link layer, and a network layer horizontally, and a user plane for transmitting data information vertically. And a control plane for transmitting a control signal. The protocol layers of FIG. 2 are based on the lower three layers of the Open System Interconnection (OSI) reference model, which are well known in communication systems, and include L1 (first layer), L2 (second layer), and L3 (first layer). Three layers).

Hereinafter, each layer of the radio protocol control plane of FIG. 2 and the radio protocol user plane of FIG. 3 will be described. The physical layer, which is the first layer, provides an information transfer service to an upper layer by using a physical channel. The physical layer is connected to the upper medium access control (MAC) layer through a transport channel, and data between the medium access control layer and the physical layer moves through the transport channel. Then, data moves between different physical layers, that is, between physical layers of a transmitting side and a receiving side through physical channels.

The MAC layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel. The RLC layer of the second layer supports the transmission of reliable data. The PDCP layer of the second layer performs a header compression function to reduce unnecessary control information in order to efficiently transmit data transmitted using an IP packet such as IPv4 or IPv6 in a relatively low bandwidth wireless section. .

The radio resource control layer (hereinafter abbreviated as 'RRC') layer located at the bottom of the third layer is defined only in the control plane, and the configuration of radio bearers (abbreviated as 'RB') is configured. It is responsible for the control of logical channels, transport channels, and physical channels in connection with reconfiguration and release. In this case, RB means a service provided by the second layer for data transmission between the terminal and the UTRAN.

Downlink transmission channels for transmitting data from the network to the UE include a broadcast channel (BCH) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages. Meanwhile, the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

Before sending data to a specific terminal, the network transmits a paging message downward to know in which cell the terminal is located. In the prior art, a method of transmitting a call message transmits an indicator for notifying transmission of a call message through a separate channel such as a paging indicator channel. In addition, an indicator for notifying transmission of a notification message for a multicast and broadcast service is also transmitted through a separate channel such as a notification indicator channel. In addition to these channels, the terminal should additionally receive a broadcast channel for transmitting system information periodically. As the number of channels to be received by the terminal is increased by transmitting to a separate channel according to each use, the operation of the terminal is complicated and terminal resources are wasted.

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to transmit control information that can simplify the operation of the mobile terminal and efficiently use the terminal resources in a wireless mobile communication system and It is to provide a reception method.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above are apparent to those skilled in the art from the following detailed description. Can be understood.

The present invention instructs a network to transmit control information such as a specific call message, a notification message, or system information in advance through one indicator channel, and the mobile station receives the one indicator channel to receive the indicator. A method of receiving the control information by using the indication information transmitted through a channel is disclosed.

In addition, the present invention periodically receives a single indication of information for the idle mode when the mobile terminal receiving the control message from the network in the idle mode (idle mode), the active mode (active mode) in the active mode (active mode) Periodically receiving one indication information, and using the control information of the indication information to determine whether to receive the control information transmitted during the period, so that the mobile terminal can efficiently perform the discontinuous reception while managing the terminal resources. To make it possible.

Preferably, the indicator channel is a frame control channel (FCCH), and the indicator information is information included in the frame control channel.

In one aspect of the present invention, a method for transmitting control information in a wireless mobile communication system according to the present invention includes: at least one of at least two different types of control information in a method for transmitting control information in a network of a wireless mobile communication system; Transmitting the indication information indicating the transmission of the control information to at least one mobile terminal through a control channel, and transmitting the at least one control information indicated by the indication information to the at least one mobile terminal. Characterized in that configured to include.

In another aspect of the present invention, a method for receiving control information in a wireless mobile communication system according to the present invention is a method for receiving control information in a mobile terminal of a wireless mobile communication system, the method comprising: at least two different types of control information from a network; Receiving indication information indicating transmission of at least one control information through a control channel, and receiving the at least one control information indicated by the indication information according to the indication information. It is done.

According to the present invention, a wireless network informs transmission of common control information such as a specific call message, a notification message, or system information in advance through a single indicator channel, and the wireless mobile terminal periodically receives the one indicator channel. The control information of the indicator channel is used to receive the common control information. In this manner, the operation of the terminal can be simplified and the terminal resource can be efficiently used.

The effects according to the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the detailed description of the present invention. There will be.

4 is a diagram for describing a method for transmitting and receiving control information according to an exemplary embodiment of the present invention. The network transmits a Frame Control Channel (FCCH) every certain period (first period). Hereinafter, the predetermined period is called a frame.

In FIG. 4, the MIB (Master Information Block) is repeatedly transmitted every second period different from the first period. The MIB includes a system information block (SIB) for transmitting system information, scheduling information of a call message, and a notification message. That is, the MIB informs scheduling information about which frequency and at what time each information is transmitted for control information such as a plurality of SIBs, a plurality of call messages, a plurality of notification messages, etc. to be transmitted during the second period. Preferably, the second period is larger than the first period. Preferably, the MIB is transmitted during the first frame of the period in which the MIB is transmitted. In this case, the FCCH transmitted in each frame may inform whether the data transmitted in the corresponding time interval (frame) is a common control message, a specific terminal dedicated control message, common data, or specific terminal dedicated data. In addition, the FCCH informs the control information what frequency and at what time each message or data is transmitted in a frame.

The mobile station receives the FCCH periodically at the first period. The mobile station receives the MIB at a corresponding frequency and time according to scheduling information included in the indication information transmitted through the FCCH when the FCCH of a specific frame instructs the transmission of the MIB. The mobile station obtains scheduling information of a specific SIB, a specific call message, and a specific notification message through the MIB. The mobile station determines, via the scheduling information, at what frequency and at what time a specific SIB or specific call message or specific notification message is transmitted. The mobile terminal may receive a SIB, a call message, and a notification message for a service subscribed to by the mobile terminal according to the scheduling information. Preferably, the MIB includes an indicator indicating or indicating a terminal identifier or a service identifier.

5 is a view for explaining a method of transmitting and receiving a common control message according to another embodiment of the present invention. Referring to FIG. 5, the network periodically transmits a PN-MAP informing of indication information and scheduling information of a call message or a notification message. Preferably, the PN-MAP is transmitted during the first frame of a paging period or notification period. In this case, the call period and the notification period may be the same or different. The FCCH transmitted in each frame indicates whether the data transmitted in the corresponding time period (frame) is a call message, a notification message, or a PN-MAP. In addition, the FCCH informs scheduling information indicating which frequency and at what time each message or data is transmitted in a frame.

The mobile station receives the PN-MAP every call period or every notification period. At this time, the mobile station can determine whether the PN-MAP is included in the frame by receiving the FCCH. Therefore, the mobile station can acquire the PN-MAP through the frame only when the FCCH notifies the transmission of the PN-MAP.

The mobile station obtains scheduling information of a specific call message or a specific notification message through the received PN-MAP. The mobile station determines the frequency and time at which a specific call message or a specific notification message is transmitted through the scheduling information. The mobile terminal may receive a call message corresponding to itself according to the identified transmission information, and may receive a notification message for a service subscribed to by the mobile terminal. The PN-MAP preferably includes an indicator including or indicating a terminal identifier or a service identifier.

6 is a view for explaining a method of transmitting and receiving control information according to an embodiment of the present invention. Referring to FIG. 6, the network transmits a call message or a notification message of a plurality of mobile terminals every call cycle. The network transmits a call message for a specific mobile terminal transmitted during one call period through a specific frame mapped to an identifier of the terminal. In addition, the network may transmit a notification message for a specific service transmitted during one notification period through a specific frame mapped to an identifier of the service. In this case, the call period and the notification period may be the same or different. The network informs the FCCH sent in each frame whether the data transmitted during that frame is a call message or a notification message. The FCCH also informs at what frequency and at what time each message or data is transmitted in a frame.

The mobile terminal periodically receives a specific frame mapped to its identifier (i.e., assigned to it) according to a call cycle to obtain a call message for itself. Alternatively, the mobile terminal periodically receives a specific frame mapped to an identifier of a service to be received by the mobile terminal according to a notification period to obtain a notification message for the service. At this time, the mobile station receives the FCCH in the frame before receiving the specific frame, and obtains the call message or the notification message through the frame only when the FCCH indicates the transmission of the call message or the notification message. do.

7 is a view for explaining a method for transmitting and receiving control information according to another preferred embodiment of the present invention. A cell supporting a bandwidth of 10 or 20 Mhz bandwidth may provide a narrow system bandwidth for a mobile terminal operating in a narrow band such as 1.25 and 2.5 Mhz. In this case, the system band mainly uses the central band of the wide band as shown in FIG. 7. At this time, the MIB or PN-MAP, call message, notification message, SIB, etc. are all transmitted in the system band. However, the SIB transmitting specific system information may be transmitted outside the system band.

The FCCH transmitted in each frame indicates whether the data transmitted in the corresponding time interval (frame) is MIB or PN-MAP, call message, notification message, and SIB. The FCCH also informs at what frequency and at what time each message or data is transmitted in a frame. The FCCH may be divided into an FCCH for a system band and an FCCH for a non-system band. Accordingly, the mobile terminal receiving only the system band can receive the FCCH for the system band and obtain information of each message or data transmitted to the system band. In addition, the mobile terminal receiving the non-system band may receive the FCCH for the non-system band to obtain information of each message or data transmitted in the non-system band.

8 is a view for explaining the configuration information of the FCCH according to an embodiment of the present invention. The FCCH provides the mobile station with a variety of control information related to data and control messages transmitted during the period (during that frame).

Referring to FIG. 8, the first part constituting the FCCH (FCCH MAP) is an FCCH MAP indicating the frequency and time that the FCCH is transmitted, the length of the FCCH information, radio resource parameters required to receive the FCCH information. Preferably, the FCCH MAP is always included in every frame. Each frame may include all of the various FCCHs of the present invention, or some of them. The FCCH MAP may indicate whether the remaining four FCCH parts except the FCCH MAP are transmitted in the frame.

The second FCCH portion (FCCH Idle mode (DL)) includes the control information required for receiving the downlink control information received when the mobile station is in the idle mode (idle mode). Preferably, the second FCCH part is included in the frame when there is control information to be transmitted downward in the frame. Control information related to the common control message, such as the MIB, SIB, call message, notification message, PN-MAP, and the like, is included here. Alternatively, MIB, SIB, call message, notification message, PN-MAP, etc. may be included in the second FCCH portion.

The third FCCH part (FCCH Idle mode (UL)) includes control information required for transmission of uplink control information transmitted when the mobile station is in the idle mode (idle mode). Preferably, the third FCCH portion contains information required for uplink random access transmission. When the mobile station transmits a random access message, the network may transmit a response of the random access message through the third FCCH portion. Alternatively, the third FCCH part may indicate that the response of the message is transmitted in a frame in which the third FCCH part is transmitted, wherein the third FCCH part includes control information related to the response of the message.

The fourth FCCH portion includes control information necessary for receiving downlink control information received when the mobile station is in an active mode. Preferably, the fourth FCCH portion includes control information of the downlink shared channel (SCH) transmitted in the corresponding frame.

The fifth FCCH part includes control information necessary for transmitting uplink control information transmitted when the mobile station is in an active mode. Preferably, the fifth FCCH portion includes control information of an uplink shared channel (SCH) transmitted in a corresponding frame.

The mobile station periodically receives the FCCH MAP to check whether there is data or information to be received in the corresponding frame. After the FCCH MAP, the mobile terminal receives only the second FCCH portion and the third FCCH portion when in the idle mode. When the mobile terminal is in the active mode, the mobile terminal receives only the fourth FCCH portion and the fifth FCCH portion.

The network may additionally transmit another FCCH part to inform control information necessary for transmission of multicast and broadcast.

It is apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

1 is a diagram illustrating a network structure of an E-UMTS.

2 and 3 illustrate a structure of a radio interface protocol between a terminal and a UTRAN (UMTS Terrestrial Radio Access Network) based on a 3GPP radio access network standard.

4 is a view for explaining a control information transmission and reception method according to an embodiment of the present invention.

5 is a view for explaining a control information transmission and reception method according to another embodiment of the present invention.

6 is a view for explaining a method for transmitting and receiving control information according to another preferred embodiment of the present invention.

7 is a view for explaining a control information transmission and reception method according to another embodiment of the present invention.

8 is a view for explaining the configuration information of the FCCH according to an embodiment of the present invention.

Claims (10)

In the control information transmission method in a network of a wireless mobile communication system, Transmitting indication information indicating transmission of at least one control information among at least two different types of control information to at least one mobile terminal through a control channel; And Transmitting the at least one control information indicated by the indication information to the at least one mobile terminal. The method of claim 1, The indication information includes scheduling information of the at least one control information. The method of claim 1, And the indication information is transmitted every first period. The method of claim 3, Transmitting scheduling information of the at least one control information every second period greater than the first period. The method of claim 2, The indication information includes control information for control information for a mobile terminal in an idle mode and control information for control information for a mobile terminal in an active mode. Transmission method. A method of receiving control information in a mobile terminal of a wireless mobile communication system, Receiving indication information indicating a transmission of at least one or more control information among at least two or more different types of control information from a network through a control channel; And And receiving the at least one control information indicated by the indication information according to the indication information. The method of claim 6, The indication information includes scheduling information of the at least one control information. The method of claim 6, And the indication information is transmitted every first period. The method of claim 8, And transmitting scheduling information of the at least one control information every second period greater than the first period. The method of claim 7, wherein The indication information includes control information for control information for a mobile terminal in an idle mode and control information for control information for a mobile terminal in an active mode. Receiving method.

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