KR100762620B1 - Receiving method and apparatus for dedicated fa multicast/broadcast service in a mobile communication system - Google Patents

Abstract

A reception method and an apparatus for MBS(Multicast/Broadcast Service) having a dedicated FA(Frequency Area) in a mobile communication system are provided to allow a user to use both a broadcast service and a data service such as an MBS or a DMB(Digital Multimedia Broadcasting) that uses different FAs, respectively by adding minimum hardware. Service signals which have passed through a radio channel are converted into baseband sample data in wireless units(110,125), are outputted as digital signals from ADCs(Analog/Digital Converters)(115,130), and then are transferred to FFT(Fast Fourier Transform) parts(120,135). The FFT parts(120,135) perform the FFT with respect to the inputted data and output the result. When a user wants to receive a broadcast service, an FA converter(105) tunes at least one receiving antenna among plural antennas to a broadcast service FA for a data service. When a broadcast service is initiated, a switching controller(140) separates two antennas used by a diversity combiner(145) as a broadcast service path and a data service path. Signals separated by the switching controller(140) are inputted to LLRs(Log Likelihood Ratios)(150,160), and the LLRs(150,160) calculate LLR values from the inputted signals and output the results. Channel decoders(155,165) perform decoding with the inputted LLR values to obtain an information bit sequence of the received service.

Description

RECEIVE METHOD AND APPARATUS FOR DEDICATED FA MULTICAST / BROADCAST SERVICE IN A MOBILE COMMUNICATION SYSTEM}

1 is a diagram illustrating a modem structure of a terminal according to the prior art.

2 is a diagram illustrating a modem structure of a terminal according to a preferred embodiment of the present invention.

3 is a flowchart illustrating an operation for simultaneously using a plurality of services in a terminal according to an exemplary embodiment of the present invention.

4 is a flowchart illustrating an operation for using only one service among a plurality of service uses in a terminal according to an exemplary embodiment of the present invention.

The present invention relates to a mobile communication system, and more particularly, to an efficient receiving method and apparatus for a multicast / broadcast service having a dedicated frequency range.

In the mobile convergence era, it is required that a terminal not only provide a portable Internet service through packet data transmission and reception but also provide a broadcast service such as digital multimedia broadcasting (DMB) with the same terminal. The widespread deployment of broadband high-speed wireless technologies such as WiMAX and Wibro is expected to provide all of the above services with a single wireless technology.

On the other hand, a promising service scenario of a network operator preparing for a portable Internet service is to operate a broadcasting and multicast dedicated frequency area (hereinafter referred to as FA), and use other FAs for data service. When the dedicated FA for broadcasting and multicast services is operated as described above, a multi-BS multicast broadcast service (MBS), which is capable of simultaneously receiving a service from multiple base stations without registering with a base station, is referred to as MBS. ) Advantageous to services (see mobile Internet 802.16e specification). However, since the terminal needs to receive two FAs at the same time, a separate reception path must be secured on hardware.

Accordingly, a terminal supporting a Mobile WiMAX or WiBRO profile for portable Internet service supports two or more receiving antennas for high speed data communication.

1 is a diagram illustrating a modem structure of a terminal according to the prior art.

As illustrated in FIG. 1, a separate standard has been developed so far for a radio technology for a multicast / broadcast service such as broadcast and a radio technology for voice call and data service. Therefore, terminals supporting different wireless technologies are manufactured in physically coupled form without sharing hardware resources.

In other words, when the radio technology used in the related art is wrong, the modem chip 110 for broadcasting and the modem chip 120 for voice / data communication are separately used.

As described above, when providing a mobile WiMAX or WiBRO-based portable Internet service to a terminal of the related art, a reception hardware for a broadcast service and a reception hardware for a data service should be separately made and combined. This not only increases the cost of the hardware, but also doubles the power consumption. However, in the mobile Internet service, since the broadcast and data services can use the same wireless technology, when a single receiver is shared, the two services can be used alternately, but there is a problem that it is generally impossible to use the broadcast and data services at the same time.

Accordingly, the present invention, which is invented to solve the problems of the prior art operating as described above, provides a method and apparatus for implementing data communication with MBS in a single wireless technology in a mobile communication system.

The present invention provides a method and apparatus for simultaneously providing a broadcast and a data service by using a reception antenna resource held by a terminal.

According to an embodiment of the present invention, a method for receiving a multicast / broadcast service having a dedicated frequency domain (FA) in a mobile communication system includes: receiving signals for a broadcast service or a data service through a plurality of antennas; When receiving a service having a dedicated frequency domain (FA) from a user, selecting at least one of the antennas in use and converting the service to an FA of the requested service; and, after the FA conversion, a broadcast service or data Receiving signals for service through the plurality of antennas, and the same FA service signals received from different antennas among the signals received according to the FA change perform diversity combining and perform different FAs. Switching control process for separating the received signals from the antennas to use each service path, It characterized by comprising the step of outputting the service signals by decoding the group switching control signal.

According to another embodiment of the present invention, in a reception apparatus for a multicast / broadcast service having a dedicated frequency region in a mobile communication system, signals for broadcast service or data service are received through a plurality of antennas and a dedicated frequency region. A FA conversion unit for selecting at least one of the plurality of antennas and converting the received service to a FA of the requested service when receiving a service having a FA; Signals for a service or data service are received through the plurality of antennas, and the same FA service signals received from different antennas among the signals received according to the FA change perform diversity combining and different FAs. Received signals from the antennas using the switching to separate into each service path Decodes the signal output from the fisherman and the switching control unit characterized in that it comprises a decoding and outputting the service signals.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. 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.

The main aspect of the present invention is to implement a data communication and broadcasting service such as MBS in a single wireless technology in a portable Internet modem, the terminal has two receiving antennas according to WiMAX or WiBRO profile, Diversity combining can be performed using the receiving antenna.

2 is a diagram illustrating a modem structure of a terminal according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the terminal structure of the present invention includes a dual antenna receiver structure for a portable Internet and an FA converter 105 and a switching controller 140. Radio frequency (RF) (110, 125), analog-to-digital conversion (ADC) section 115, 130, fast Fourier transform (FFT) section (120, 135), log-like Log Likelihood Ratio (hereinafter referred to as LLR) units 150 and 160 and channel decoders 155 and 165 are included.

The reception structure of the data service or the broadcast service in the terminal having the structure as described above, the service signals passed through the wireless channel is converted into the baseband sample data in the radio unit 110, 125 and the analog-to-digital converter 115 130 is output as a digital signal to the FFT unit (120, 135). The FFT units 120 and 135 perform an FFT operation on the input data and output the same. That is, the received signal is demodulated to the value of each subcarrier and output to the switching controller 140. The service signal input as described above may receive only one service signal to all the antennas in use, or may receive a different service signal for each antenna.

At this time, the role of the FA converter 105 serves to tune at least one receiving antenna from among a plurality of antennas to a broadcast service FA when a data service is to be received. Alternatively, when using a data service while receiving a broadcast service through a plurality of antennas, it may serve to tune one reception antenna among two antennas in use as a broadcast service FA. That is, when a user is requested to receive a service having another FA, the switching controller 140 is controlled to select at least one of the antennas in use and tune to the FA of the requested service. The switching controller 140 separates two antennas used in the diversity combiner 145 into separate broadcast service paths and data service paths when starting a broadcast service. In addition, when a broadcast service or a data service are received from both antennas, that is, the same FAs received from the antennas, diversity combining is performed and output.

The signal separated from the switching controller 140 is input to the LLR units 150 and 160, and the LLR units 150 and 160 calculate and output an LLR value from the input signal. The channel decoders 155 and 165 decode the input LLR value to obtain an information bit string of the received service.

3 is a flowchart illustrating an operation for simultaneously using a plurality of services in a terminal according to an exemplary embodiment of the present invention.

3 is a case in which a user wants to use a second service, which is a second service while using a data service, which is a first service, and the user adds a second service in step 320 while using the first service in step 310. If the user wants to use, the user transmits a request to the FA converter, and in step 330, the FA converter checks whether there is an available antenna reception path and if present, proceeds to step 340 to activate the available antenna reception path. The service and the second service can be used at the same time.

However, if there is no available antenna reception path existing in step 330, the flow proceeds to step 350 to convert one antenna reception path used for diversity combining into a broadcast-only FA designated by the operator, and each antenna reception path in step 360. Disconnect. Thus, in step 370, the first service and the second service are simultaneously performed.

As described above, in FIG. 3, the second service is additionally used when the first service is used, and the data service, which is the first service, is additionally used while the second service is used. Can be.

4 is a flowchart illustrating an operation for using only one service among a plurality of service uses in a terminal according to an exemplary embodiment of the present invention.

4 illustrates an operation of switching only the first service when the second service data is terminated while simultaneously using the data service as the first service and the broadcast service as the second service, and in step 410, the first service and the second service. If the second service is finished in step 420 while simultaneously receiving the service, the service termination event is transmitted to the FA converter in step 430.

Thereafter, if it is determined in operation 440 whether the antenna used for the second service can be switched to the first service FA, and can be switched, the operation proceeds to operation 450 to convert the antenna used for the second service to the first service FA. Then, diversity combining the two antenna reception paths. Thus, the first service is used using two antennas. However, if it cannot be switched in step 440, the antenna reception path used for the second service is deactivated to use the first service through one antenna.

As described above, in FIG. 4, when the first service and the second service are used simultaneously, the second service is stopped and only the first service is used. When the first service and the second service are used simultaneously, the first service is stopped and the second service is used. In the case of using a service can be implemented in the same manner as described above.

In FIG. 3 and FIG. 4 illustrating an embodiment of the present invention as described above, the first service is a data service and the second service is a broadcast service. However, both the first and second services may be data services or broadcast services. It is obvious that modifications are possible.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

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 has the effect that it is possible to simultaneously use a broadcast service such as MBS or DMB and data service using FA differently with minimal hardware addition.

Claims (20)

A reception method for a multicast / broadcast service having a dedicated frequency domain (FA) in a mobile communication system, When the user is requested to receive a service having a dedicated frequency domain FA, selecting at least one of a plurality of antennas and tuning to a dedicated FA of the requested service; After the tuning process, receiving signals for a broadcast service or a data service through the plurality of antennas; Switching combining the service signals of the same FA received from different antennas among the signals received through the tuned antennas, and separating the received signals from antennas using different FAs into respective service paths. Control process, And decoding the switched controlled signals. The method of claim 1, wherein the tuning to the dedicated FA of the requested service comprises: And tuning to at least one receiving antenna from among a plurality of antennas receiving the service signal of the data service as a dedicated FA of the broadcast service when the broadcast service is to be received. Receiving method for cast / broadcast service. The method of claim 1, wherein the switching control process, Dedicated frequency domain comprising the step of performing diversity combining for the data service when starting the broadcast service, or separating the two antennas in use into separate broadcast service paths and data service paths, respectively. Receiving method for a multicast / broadcast service. The method of claim 1, Further using a service simultaneously with another service having a different dedicated FA while using the service, The process of using the broadcast services at the same time, Receiving a service reception request for the other service having the other dedicated FA; Activating the available antenna reception path when the available antenna reception path exists according to the service reception request; And if there is no available antenna reception path, converting one antenna reception path used for diversity combining to a broadcast service having the other dedicated FA, and separating each antenna reception path. A reception method for a multicast / broadcast service having a frequency domain. The method of claim 1, The method further includes the step of switching to one service by terminating any one of the services being used simultaneously during the simultaneous use of the broadcast service and the data service. During the simultaneous use of the broadcast service and the data service, the process of switching to one service by terminating any one of the services being used simultaneously, Receiving a service termination event indicating that the specific service is terminated when the specific service is terminated; If it is possible to determine whether the antenna used for the specific service can be switched to the currently receiving service FA, the switching to the receiving service FA; If it is not possible to switch to the receiving FA for the service, the receiving method for a multicast / broadcast service having a dedicated frequency domain, comprising: deactivating an antenna receiving path used for the specific service. A reception apparatus for a multicast / broadcast service having a dedicated frequency range in a mobile communication system, A receiver which receives signals for a broadcast service or a data service through a plurality of antennas in use; If the user is requested to receive a service having a dedicated frequency range, and comprises a FA conversion unit for selecting at least one of the plurality of antennas to tune to the dedicated FA of the requested service, Here, after the tuning, the receiving unit receives signals for a broadcast service or a data service through the plurality of antennas, and the broadcast service of the same FA received from different antennas among the signals received through the tuned antennas. A switching controller for diversity combining the signals and receiving signals from antennas using different FAs into respective service paths; And a decoding unit for decoding and outputting signals output from the switching control unit. The receiving apparatus for a multicast / broadcast service having a dedicated frequency domain. The method of claim 6, wherein the FA conversion unit, When the broadcast service is to be received, at least one receiving antenna from among a plurality of antennas receiving the service signal of the data service is tuned to a dedicated FA of the broadcast service. Receiving device for service. The method of claim 6, wherein the switching control unit, When the broadcast service is started, multicasting with a dedicated frequency domain is characterized by performing diversity combining for the data service or by separating two antennas in use into separate broadcast service paths and data service paths. Device for a broadcast / broadcast service. The method of claim 6, wherein the FA conversion unit, Receiving a service reception request for the other service having the other dedicated FA to simultaneously use another service having the other dedicated FA during the use of one service, Check the existence of the available antenna reception path according to the service reception request, and if available, activate the available antenna reception path, And if there is no available antenna receive path, switching one antenna receive path used for diversity combining to the other service having the other dedicated FA and separating each antenna receive path. A reception device for a multicast / broadcast service having a frequency domain. The method of claim 6, wherein the FA conversion unit, In order to switch to one of the broadcast service and the data service at the same time, receiving a service end event, which indicates that any one of the broadcast service and the data service is terminated, If it is possible to switch by determining whether the antenna used for the specific service can be switched to the currently receiving service FA, then switching to the receiving service FA, If the antenna used for the specific service cannot be switched to the receiving service FA, the antenna reception path used for the specific service is deactivated. Device. The method of claim 1, And the plurality of antennas are being used for receiving at least one service. The method of claim 11, wherein the tuning to the dedicated FA of the requested service comprises: And tuning to at least one receiving antenna from among a plurality of antennas receiving the service signal of the data service as a dedicated FA of the broadcast service when the broadcast service is to be received. Receiving method for cast / broadcast service. The method of claim 11, wherein the switching control process, Dedicated frequency domain comprising the step of performing diversity combining for the data service when starting the broadcast service, or separating the two antennas in use into separate broadcast service paths and data service paths, respectively. Receiving method for a multicast / broadcast service. The method of claim 11, Further using a service simultaneously with another service having a different dedicated FA while using the service, The process of using the services at the same time, Receiving a service reception request for the other service having the other dedicated FA; Activating the available antenna reception path when the available antenna reception path exists according to the service reception request; And if there is no available antenna reception path, converting one antenna reception path used for diversity combining into a broadcast service having the other dedicated FA and separating each antenna reception path. A reception method for a multicast / broadcast service having a frequency domain. The method of claim 11, The method further includes the step of switching to one service by terminating any one of the services being used simultaneously during the simultaneous use of the broadcast service and the data service. During the simultaneous use of the broadcast service and the data service, the process of switching to one service by terminating any one of the services being used simultaneously, Receiving a service termination event indicating that the specific service is terminated when the specific service is terminated; If it is possible to determine whether the antenna used for the specific service can be switched to the currently receiving service FA, switching to the receiving service FA; If it is not possible to switch to the receiving FA for the service, the receiving method for a multicast / broadcast service having a dedicated frequency domain, comprising: deactivating an antenna receiving path used for the specific service. The method of claim 6, And the plurality of antennas are used for receiving at least one service. The reception apparatus for a multicast / broadcast service having a dedicated frequency region. The method of claim 16, wherein the FA conversion unit, When the broadcast service is to be received, at least one receiving antenna from among a plurality of antennas receiving the service signal of the data service is tuned to a dedicated FA of the broadcast service. Receiving device for service. The method of claim 16, wherein the switching control unit, When the broadcast service is started, multicasting with a dedicated frequency domain is characterized by performing diversity combining for the data service or by separating two antennas in use into separate broadcast service paths and data service paths. Device for a broadcast / broadcast service. The method of claim 16, wherein the FA conversion unit, Receiving a service reception request for the other service having the other dedicated FA to simultaneously use another service having the other dedicated FA during the use of one service, Check the existence of the available antenna reception path according to the service reception request, and if available, activate the available antenna reception path, And if there is no available antenna receive path, switching one antenna receive path used for diversity combining to the other service having the other dedicated FA and separating each antenna receive path. A reception device for a multicast / broadcast service having a frequency domain. The method of claim 16, wherein the FA conversion unit, In order to switch to one of the broadcast service and the data service at the same time, receiving a service end event, which indicates that any one of the broadcast service and the data service is terminated, If it is possible to switch by determining whether the antenna used for the specific service can be switched to the currently receiving service FA, then switching to the receiving service FA, If the antenna used for the specific service cannot be switched to the receiving service FA, the antenna reception path used for the specific service is deactivated. Device.

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