Patent Description:
In our <NUM>st century information society, broadcast communication services are digitized, and multi-channel, high-quality broadband service is provided. The recent increase in the spread of high screen quality digital televisions (TVs), Portable Multimedia Players (PMPs), and portable broadcast devices has caused an increasing demand for the support of various receiving schemes in the digital broadcast service.

In order to fulfill such a demand, the Digital Video Broadcasting-Terrestrial (DVB-T2), which is a second generation European terrestrial wave digital broadcast standard, is preparing standards for a receiving scheme reusing the conventional home digital receiving antenna, a receiving scheme using multiple antennas in order to increase capacity, and a receiving scheme for a portable mobile terminal, respectively. DVB-T/H, which is a first generation terrestrial wave digital broadcast standard, takes only the two schemes including a stationary receiving scheme and a mobile receiving scheme into consideration. However, the DVB-T2 also includes a scheme of using multiple antennas, and considers a physical layer structure and a change of control information according to the physical layer structure as a main standardization job.

In the physical layer structure of the DVB-T2, a control channel is a channel for transmitting a control message with respect to a transmission scheme in the physical layer. In the control channel, a basic unit of a transmitted signal is a frame, which may include multiple services, and includes a service index, location information, a modulation scheme/coding rate, and a cell identifier (ID) of each service. In the control channel, the service configuration and related information may be different according to each frame. Therefore, for each frame, the control channel is transmitted separately from the data channel.

Referring to <FIG>, a transmitter <NUM> transmits different broadcast services in multiple Radio Frequency (RF) bands, respectively, and a receiver <NUM> tunes to an RF containing a desired service and receives the desired service. For example, when the receiver <NUM> wants to receive the service <NUM>, the receiver <NUM> tunes to RF #<NUM>, obtains information, such as location information and modulation/coding scheme, relating to the service <NUM>, and then decodes the service <NUM>.

Referring to <FIG>, the transmitter <NUM> divides a service (corresponding to each service in <FIG>), which includes an existing long packet configured by combining multiple RFs, into multiple short sub-slots, and then transmits the divided sub-slots through multiple RF bands. The receiver <NUM> detects the location of a pertinent service in each RF band including a desired service through the control information and then receives the pertinent service. In receiving the service <NUM>, the receiver <NUM> decodes the pertinent services in an order capable of receiving the sub-slots in the time domain, i.e., in the order of RF1, RF4, RF3, and RF2. Therefore, for the same quantity of service, transmission of a smaller quantity of data through multiple frequencies is expected to be capable of achieving more time and frequency diversity gains than simultaneous transmission of a large quantity of data by using a fixed RF for each service. Such a frame configuration scheme as described above is called Time-Frequency Slicing (TFS).

In the structure shown in <FIG>, ten service packets are transmitted through four RFs. In such a TFS frame, all service packets are first allocated to one RF, and packets cyclic-shifted from the initial group of all the service packets are then allocated to an adjacent RF. When four RF bands are used as shown in <FIG>, one service is transmitted through four RFs (RF1 ~ RF4). Therefore, each service basically includes four sub-slots. However, as in the service <NUM>, the service may include five sub-slots due to the cyclic shift.

Referring to <FIG>, a P1 signal and a P2 signal are transmitted at the initial portion of each frame. The P1 signal may be used as a preamble for synchronization, and the P2 signal transmits control information for each service included in the current or next frame. The control information includes location information indicating the start point and the terminating point of data of each service. When the receiver switches the service channel while receiving the service, the receiver can receive the switched service only after acquiring the control information of the switched service.

<FIG> illustrates conventional service switching. When multiple frames (frame n,. , frame n+<NUM>) are being transmitted in the time domain, each frame includes a P2 signal <NUM> to <NUM> at the initial portion thereof and multiple services following the P2 signal. The frame may be transmitted in the FF mode or TFS mode, as shown in <FIG> or <FIG>. However, for convenience of description, transmission in the FF mode will be taken into consideration in the following description. Further, for convenience of description, it is assumed that the P2 signal indicates control information of the current frame.

Referring to <FIG>, when the receiver switches the channel to another service while receiving a service at frame n (<NUM>), the receiver decodes the P2 signal for receiving the switched service at the next frame. Since the P2 signal <NUM> includes the scheduling information at frame (n+<NUM>), the receiver is unable to receive the switched service at frame (n+<NUM>) if the receiver fails to decode the P2 signal <NUM>. Further, if the receiver continuously fails to decode the P2 signal, that is, if the receiver fails to decode not only the P2 signal <NUM> but also the P2 signal <NUM> of frame (n+<NUM>), the receiver receives the switched service at frame (n+<NUM>) by using the control information <NUM> acquired from the P2 signal <NUM> of frame (n+<NUM>).

According to the conventional systems described above, when a service switching occurs, the zapping time from the time point of the service switching to the time point of reception of the switched service may be too long according to whether the decoding of the P2 signal is a success or failure. Therefore, there has been a request for a scheme for transmitting and receiving control information of switched service so that the receiver can efficiently receive the switched service when a service switching has occurred.

Patent document <CIT>, discloses a method and apparatus for transmitting/receiving control information in a system in which one or more Radio frequencies are used to carry multiple services through a frame constituted by time resources or time-frequency resources.

Document "<NPL>, discloses four types of refence signals which are inserted to T2-signal.

Patent document <CIT>, discloses an apparatus, system, method and computer program product for providing a user of a terminal with broadcast services.

Document "<NPL>, discloses TS and PSI/SI splitting.

Accordingly, the present invention has been made to solve the above-mentioned problems, and the present invention provides methods for transmitting and receiving control information in a second generation digital video broadcasting terrestrial, DVB-T2, broadcast communication system according to claims <NUM> and <NUM> respectively.

The above and other aspects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted to avoid making the subject matter of the present invention unclear.

The present invention provides a signaling technique by which, in the case of the occurrence of a service switching due to user's switching of the service channel that the user wants to receive, even when a receiver has failed to decode a P2 signal including control information, the receiver can acquire control information of the next frame. Specifically, the present invention provides an in-band signaling scheme in which service data of a transmitted frame includes control information indicating scheduling information of the frame.

In the in-band signaling, the service type is divided into an anchor service, a primary service, and a secondary service, and the control information transmitted through each service has different configurations according to the service type. Further, by appointing the number of primary services, signaling is performed based on the result of a comparison between the total number of the services transmitted through frames and the predetermined number of primary services. Referring to <FIG>, based on an assumption that a total of (N+K) services are transmitted through frames, N primary services (<NUM> to N services) <NUM> and K secondary services ((N+<NUM>) to (N+K) services) <NUM> exist, and one service from among the N primary services <NUM> is appointed as an anchor service 410a.

As noted by the arrows between the N primary services in <FIG>, each of the N primary services include scheduling information relating to all the other primary services as well as itself. One primary service from among the N primary services is appointed as the anchor service, and the anchor service includes not only the scheduling information of all the primary services but also scheduling information of the K secondary services. Meanwhile, the secondary services transmit scheduling information of the anchor service including themselves.

Therefore, when the total number of transmitted services does not exceed N, all the transmitted services become primary services and each transmitted service includes scheduling information of all the services. Meanwhile, when the total number of transmitted services exceeds N, that is, when (N+K) and K secondary services exist as well as the primary services, one service is determined as the anchor service from among the N primary services, and the anchor service includes control information of all the services including the primary services and the secondary services.

In <FIG>, a service is transmitted through a Packet Layer Pipe (PLP), which is a Time Division Multiplexing (TDM) channel, and a target/anchor PLP refers to a target/anchor service. However, the present invention is not limited to the case of using the PLP and is also applicable to other types of services.

In <FIG> it is assumed that each of the P2 signals <NUM> to <NUM> includes control information of a current frame, and the control information included in the service data indicates scheduling information of a next frame. Also, it is assumed that the number N of primary services is <NUM>. Further, it is assumed that decoding of the P2 signals <NUM> and <NUM> of frames (n+<NUM>) and (n+<NUM>) has been proved a failure.

First, if the number of transmitted services does not exceed the number N of the primary services, when a service switching occurs at frame n (<NUM>), the service received at frame n becomes a primary service and the receiver acquires control information of a target service by decoding of the primary service. That is, since the control information acquired through an in-band signaling at frame n indicates control information of the next frame, the receiver can instantly receive the switched service at frame (n+<NUM>). As a result, when decoding of the two continuous P2 signals <NUM> and <NUM> is a continuous failure, the signaling scheme of the preferred embodiment can achieve a zapping time two frames faster than the conventional signaling scheme depending on only the P2 signal. Even when decoding of the P2 signal <NUM> is a failure and decoding of the next P2 signal <NUM> is a success, it is possible to receive the switched service at frame (n+<NUM>) instantly after the occurrence of service switching. Therefore, the present signaling scheme can achieve a zapping time one frame faster than the conventional signaling scheme depending on only the P2 signal.

Further, when the total number of transmitted services exceeds N, the receiver acquires control information of the anchor service by decoding the existing service at frame n and acquires control information of the target service by receiving the anchor service at frame (n+<NUM>). Therefore, the receiver can receive the switched service from frame (n+<NUM>).

Meanwhile, the in-band signaling having a very excellent performance in view of the zapping time corresponds to the case in which each service includes control information of all services. However, since this scheme requires a vary large overhead, there is inevitably a limitation in the number of services capable of satisfying an allowable overhead. For example, <NUM> services are considered and an overhead for each service is assumed to be <NUM> bits. When each service includes control information of all the <NUM> services, the total quantity of the overhead is <NUM>,<NUM> bits (<NUM>*(<NUM>*<NUM>)=<NUM>,<NUM>), and the overhead ratio is calculated as <NUM>. Therefore, the overhead ratio satisfies the below-par value of <NUM>, which is the allowable maximum overhead ratio. When extended to two times the number of services, that is, when <NUM> services are supported, the overhead ratio has a value of <NUM>, a value obtained from <NUM>*(<NUM>*<NUM>)=<NUM>,<NUM> bits, which exceeds the threshold, i.e. the allowable maximum overhead ratio. Therefore, the maximum number of supportable services satisfying the overhead threshold is <NUM>.

Therefore, there is a need for a signaling technique that can support as many services as possible while allowing each service to include control information of many services, so as to achieve a good performance in the zapping time.

Referring to <FIG>, a total of K services are transmitted and (2N+<NUM>) services can be supported by the in-band signaling. The (2N+<NUM>) services include one primary service and 2N secondary services. One primary service appointed from among the (2N+<NUM>) services includes control information of all the services.

Referring to <FIG>, the (2N+<NUM>) services are divided into two groups <NUM> and <NUM>, and the primary service 510a belongs to both of the two groups and serves as a connection point between the two groups. Further, when the (2N+<NUM>) services are arranged in turn according to the size of the service index, first N secondary services arranged in turn from the service having the smallest index belong to group #<NUM><NUM>, and next N secondary services belong to group #<NUM><NUM>, while the service having the index of (2N+<NUM>) is a primary service 510a and belongs to both groups. Therefore, each group includes (N+<NUM>) services including one primary service and N secondary services. Data of each service includes scheduling information for all the services of the group, to which the service belongs, and the primary service repeatedly belongs to every group. As a result, the primary service includes control information of all the services belonging to all the groups.

In other words, the N secondary services belonging to each group have scheduling information for all the services belonging to the group. That is, each secondary service includes control information of the primary service and all the secondary services including itself belonging to its group. In contrast, the primary service includes control information of all the services including itself belonging to all the groups.

For comparison with the configuration shown in <FIG> according to the first embodiment of the present invention, consider a service having a service index of (N+<NUM>) belonging to group #<NUM> in the second embodiment of the present invention shown in <FIG>. In the first embodiment, the receiver should acquire the control information of a target service through the anchor service, in order to determine if the service having a service index of (N+<NUM>) switches to another service within the group including the N services or another service out of the group including the N services. In contrast, according to the second embodiment, for example, in order to perform a service switching from a service having a service index of (N+<NUM>) belonging to group #<NUM> to a service belonging to group #<NUM>, it is necessary to acquire control information for a target service through a primary service having a service index of (2N+<NUM>). However, it is possible to instantly, i.e. without acquisition of additional control information, switch from the service having the service index of (N+<NUM>) belonging to group #<NUM> to a target service belonging to the same group, i.e. group #<NUM>.

That is, for the service switching between groups, scheduling information for the target service can be obtained through decoding of an additional service, such as the primary service. However, in relation to the service switching within the same group, it is possible to directly obtain scheduling information of the target service without receiving an additional service.

Further, consider the same signaling overhead ratio while maintaining the basic configuration in which each service includes control information of other services. For example, assuming that the maximum number of supportable services capable of satisfying the overhead ratio of below par <NUM>% is <NUM>, the second embodiment of the present invention can support a total of <NUM> services through two groups each including <NUM> services at an overhead ratio below par <NUM>%. Specifically, the quantity of required overhead corresponds to <NUM>,<NUM> bits (<NUM>*<NUM>*(<NUM>*<NUM>)=<NUM>,<NUM>), which is similar to <NUM>,<NUM> bits (<NUM>*(<NUM>*<NUM>)=<NUM>,<NUM>) when each of the <NUM> services includes control information of all the services. That is, the configuration shown in <FIG> can support <NUM> more services than the case of supporting <NUM> services, with nearly the same assumption in view of the signaling configuration and the overhead.

In <FIG> it is assumed that each of the P2 signals <NUM> to <NUM> includes control information of a current frame, and the control information included in the service data indicates scheduling information of a next frame. Further, it is assumed that decoding of the P2 signals <NUM> and <NUM> of frames (n+<NUM>) and (n+<NUM>) has been proved a failure. Also, it is assumed that the number of secondary services for each group is N.

Referring to <FIG>, when the service that the receiver is currently receiving and the target service to which the receiver wants to switch belong to the same group, the current service includes control information of the target service. Therefore, when a service switching <NUM> occurs at frame n (<NUM>), the receiver can receive the target service at frame (n+<NUM>), which is the next frame. That is, since the control information acquired through an in-band signaling from the current service at frame n indicates control information of the next frame, the receiver can instantly receive the switched service at frame (n+<NUM>). Therefore, in the case of a continuous failure in decoding two P2 signals <NUM> and <NUM>, the two frames can achieve faster zapping time in the scheme of the preferred embodiment than in the conventional signaling scheme depending on only the P2 signal.

Further, when the service being currently received and the target service to which switching is required belong to two different groups, the receiver uses the primary service in order to get control information of the target service. That is, the receiver acquires control information for the primary service by decoding the existing service at frame n, and acquires control information for the target service by receiving the primary service at frame (n+<NUM>). Therefore, from frame (n+<NUM>), the receiver can receive the switched service. Accordingly, in the case of a continuous failure in decoding the two P2 signals <NUM> and <NUM>, the scheme of the preferred embodiment can achieve zapping time one frame faster than the conventional signaling scheme depending on only the P2 signal. Referring to <FIG>, in order to enable a receiver to acquire control information for a target service when the receiver switches from a service being received to the target service, a transmitter needs to transmit a P2 signal including control information through a separate channel different from the data channel. Therefore, in step <NUM>, the transmitter configures a P2 signal including control information indicating scheduling information for services and inserts the P2 signal in the frame. Then, in step <NUM>, the transmitter transmits the frame including the P2 signal to the receiver. Referring to <FIG>, in step <NUM>, the receiver receives service n at the current frame. Then, in step <NUM>, the receiver determines if a service switching has occurred during receiving of service n. When a service switching has occurred during receiving of service n, the receiver decodes a P2 signal including control information for the switched service at the next frame in order to acquire the P2 signal in step <NUM>. When a service switching has not occurred during the receiving of service n, the receiver returns to step <NUM>, in which the receiver continuously receives service n.

In step <NUM>, the receiver determines if the decoding of the P2 signal is successful. When the decoding of the P2 signal has been proved a failure, the receiver returns to step <NUM>, in which the receiver tries to decode the P2 signal again. When the decoding of the P2 signal has been proved a success as a result of the determination in step <NUM>, the receiver acquires control information for the target service m from the decoded signal P2 and receives the target service m at the location at which the target service m is transmitted at the next frame according to the control information in step <NUM>.

In <FIG>, the transmitter transmits service data including control information according to the scheme as described above with reference to <FIG>.

Referring to <FIG>, in step <NUM>, the transmitter determines the number N of primary services and parameters relating to the frame configuration, such as the index of an anchor service. Then, in step <NUM>, the transmitter configures the P2 signal in consideration of the determined parameters. At this time, the number N of primary services may be predetermined between the transmitter and the receiver, in which case it is unnecessary to perform a separate signaling for the parameter N indicating the number of primary services. Further, in selecting one service from among the primary services as an anchor service, it is possible to use a service index predetermined between the transmitter and the receiver, which makes it unnecessary to perform a separate signaling of related information. For example, in an arrangement of indexes of N primary services according to the magnitude of the index number, the first index or the last index (corresponding to the anchor service in <FIG>) may be predetermined to be used for the anchor service.

In step <NUM>, control information indicating scheduling information on other services to be included in each service according to its service type based on the classification criterion illustrated in <FIG> is inserted in each service data. In step <NUM>, the transmitter configures a frame including the P2 signal and service data and transmits it to the receiver.

In <FIG>, the receiver receives service data including control information according to the scheme as described above with reference to <FIG>.

Referring to <FIG>, in step <NUM>, the receiver receives service n at frame n (i.e. at current frame). Then, in step <NUM>, the receiver determines if a service switching to another service during the service receiving at frame n has occurred. When a service switching has not occurred, the receiver returns to step <NUM>, in which the receiver continuously receives service n at the next frame. In contrast, when a service switching has occurred, the receiver proceeds to step <NUM>, in which the receiver completes decoding of service n at the current frame. Thereafter, in step <NUM>, the receiver compares the total number of the services transmitted from the transmitter with the number N of the primary services either pre-promised between the transmitter and the receiver or acquired through a separate signaling. When the total number of services does not exceed the number N of primary services, the receiver proceeds to step <NUM>, in which the receiver acquires control information of service m, which is the target service, at the current frame n. Then, in step <NUM>, the receiver receives service m by using the control information.

Meanwhile, as a result of the comparison in step <NUM>, when the total number of services exceeds the number N of primary services, the receiver proceeds to step <NUM>, in which the receiver acquires control information for the anchor service through the decoded service n. Then, in step <NUM>, by using the control information for the anchor service, the receiver decodes the anchor service at the next frame, i.e. at frame (n+<NUM>). In step <NUM>, the receiver acquires control information of service m from the decoded anchor service. In step <NUM>, the receiver receives service m at the next frame, i.e. at frame (n+<NUM>), by using the control information.

In <FIG>, in regard to the second embodiment, the transmitter transmits service data including control information according to the scheme as described above with reference to <FIG>.

Referring to <FIG>, in step <NUM>, the transmitter determines parameters relating to the frame configuration, such as the number of groups, the group size N, and an index of a primary service. In step <NUM>, the transmitter configures a P2 signal in consideration of the determined parameters. The group size N, which corresponds to the number of services included in each group, and the number of groups may be predetermined as a number promised between the transmitter and the receiver, in which case it is unnecessary to perform a separate signaling of the parameters relating to the number of groups and the group size. Further, in determining one service from among the services as a primary service, it is possible to use a service index predetermined between the transmitter and the receiver, which makes it unnecessary to perform a separate signaling of related information. For example, in an arrangement of indexes of (2N+<NUM>) service indexes according to the magnitude of the index, the first index or the last index (corresponding to the primary service in <FIG>) may be predetermined to be used for the primary service.

In step <NUM>, control information indicating scheduling information on other services to be included in each service according to the service type based on a standard set in <FIG> is inserted in each service data. That is, the service data of the primary service includes control information of all the services belonging to all of the groups. Further, service data of the secondary services belonging to each group includes control information of all the services belonging to the group. In step <NUM>, the transmitter transmits a frame including the P2 signal and service data including the control information to the receiver.

In <FIG>, the receiver receives control information included in service data according to the scheme as described above with reference to <FIG>.

Referring to <FIG>, in step <NUM>, the receiver receives service n at frame n (i.e. at a current frame). Then, in step <NUM>, the receiver determines if service n switches to another service during the service receiving at frame n has occurred. When a service switching has not occurred, the receiver returns to step <NUM>, in which the receiver continuously receives service n at the next frame. In contrast, when a service switching has occurred, the receiver proceeds to step <NUM>, in which the receiver completes decoding of service n at the current frame. Thereafter, in step <NUM>, the receiver determines if service m, which is a target service to be newly received, exists within the same group as the group of the service n. As a result of the determination in step <NUM>, when the target service exists within the same group, the receiver proceeds to step <NUM>, in which the receiver acquires control information of service m at the current frame. Then, in step <NUM>, the receiver receives service m by using the control information.

Meanwhile, as a result of the determination in step <NUM>, when it is determined that service m belongs to a group different from the group of service n, the receiver proceeds to step <NUM>, in which the receiver acquires control information for the primary service through the decoding of service n. Then, in step <NUM>, by using the control information, the receiver decodes the primary service at the next frame, i.e. at frame (n+<NUM>). In step <NUM>, the receiver acquires control information of service m from the decoded primary service. In step <NUM>, the receiver receives service m at the next frame, i.e. at frame (n+<NUM>), by using the control information.

The structure shown in <FIG> corresponds to a structure for performing the operation as shown in <FIG>.

Referring to <FIG>, a P2 signal generator <NUM> generates a P2 signal by using the parameters determined by an anchor service number determiner <NUM> and a primary service index determiner <NUM>. The anchor service control information inserter <NUM> inserts control information, which is to be included in the anchor service, in the service data of the anchor service by using information input from the primary service index determiner <NUM> and the anchor service number determiner <NUM> and information input from a service control information generator <NUM> and a service data generator <NUM>. The service control information generator <NUM> generates control information indicating scheduling information of all the services for the anchor service.

Meanwhile, a primary service control information inserter <NUM> inserts control information, which is to be included in the primary service, in the data of the primary service by using information input from the primary service index determiner <NUM>, the service control information generator <NUM>, and the service data generator <NUM>. For the primary service, the service control information generator <NUM> generates control information indicating scheduling information of all the primary services. Finally, a secondary service control information inserter <NUM> inserts control information, which is to be included in the secondary service, in the data of the secondary service by using information input from the anchor service number determiner <NUM>, the service control information generator <NUM>, and the service data generator <NUM>. For the secondary service, the service control information generator <NUM> generates control information indicating scheduling information of the anchor service and a pertinent secondary service.

An FF/TFS frame configuration unit <NUM> configures an FF or TFS frame by using service data of all the services in which the control information has been inserted, together with a P2 signal. A frame transmitter <NUM> transmits the configured FF or TFS frame to a receiver.

The structure shown in <FIG> corresponds to a structure for performing the operation described in <FIG>.

Referring to <FIG>, a P2 signal generator <NUM> generates a P2 signal by using the parameters determined by a primary service index determiner <NUM> and a group number/size determiner <NUM>. The primary service control information inserter <NUM> inserts control information, which is to be included in the primary service, in the service data of the primary service by using information input from the primary service index determiner <NUM> and information input from a service control information generator <NUM> and a service data generator <NUM>. The service control information generator <NUM> generates control information indicating scheduling information of all the services including the primary service for the primary service.

Meanwhile, a secondary service control information inserter <NUM> inserts control information, which is to be included in the secondary service, in the data of the secondary service by using information input from the group number/size determiner <NUM>, the service control information generator <NUM>, and the service data generator <NUM>. For each secondary service, the service control information generator <NUM> generates scheduling information of all the services (i.e. all the secondary services and the primary service) within the group including the secondary service.

Further, an FF/TFS frame configuration unit <NUM> configures an FF or TFS frame by using service data of all the services in which the control information has been inserted, together with a P2 signal. A frame transmitter <NUM> transmits the configured FF or TFS frame to a receiver. Referring to <FIG>, the frame receiver <NUM> receives a frame transmitted from the transmitter and delivers the received frame to the service decoder <NUM>, and the service switching determiner <NUM> determines if a service switching to a target service has occurred during reception of the service at the frame.

For the first embodiment described above with reference to <FIG>, the service decoder <NUM> decodes the service at the current frame and acquires control information for the anchor service or target service from the decoded service. When the total number of services exceeds the number of primary services, the service decoder <NUM> decodes the anchor service by using the acquired control information for the anchor service, and acquires control information for the target service from the decoded anchor service. Then, the service decoder <NUM> receives the target service by using the control information for the target service.

For the second embodiment described above with reference to <FIG>, the service decoder <NUM> decodes the service at the current frame and acquires control information for the primary service or target service from the decoded service. When the target service belongs to a group different from the group including the current service, the service decoder <NUM> decodes the primary service by using the control information for the primary service, and then acquires control information for the target service from the decoded primary service. Then, the service decoder <NUM> receives the target service by using the control information for the target service. According to the present invention, it is possible to efficiently transmit and receive a frame, which includes multiple services configured through a combination of one or more RFs. Therefore, the present invention enables rapid receiving of a switched service in the case of service switching.

Claim 1:
A method of transmitting control information in a second generation digital video broadcasting terrestrial, DVB-T2, broadcast communication system, the method comprising:
generating a plurality of physical layer frames, each including a plurality of time division multiplex, TDM, channels, each TDM channel including data of a service; and
transmitting the plurality of physical layer frames,
wherein a first frame of the plurality of physical layer frames comprises a control part including a first P2 signal and a data part including at least one primary TDM channel and at least one secondary TDM channel,
wherein the at least one primary TDM channel includes first scheduling information for each of the at least one primary TDM channel included in a second frame of the plurality of physical layer frames,
wherein the second frame comprises a second P2 signal and is the next frame of the first frame,
wherein the first P2 signal includes first control information for each TDM channel included in the first frame,
wherein one primary TDM channel among the at least one primary TDM channel is configured to include second control information including the first scheduling information and second scheduling information for each of the at least one secondary TDM channel included in the second frame.