KR101449638B1 - System and method for transmitting/receiving data in a communication system - Google Patents

Abstract

In a communication system, a transmitter of a secondary cell detects a first frequency band that is not used in a primary cell, divides the first frequency band into a plurality of partial frequency bands Determining a first partial frequency band to be used for data transmission / reception with a receiver which is provided by a transmitter of the second cell among the partial frequency bands, and determining the first partial frequency band from the receiver among the partial frequency bands Determines a second partial frequency band to be used for receiving feedback information including information on whether to change the first partial frequency band, and transmits information on the first partial frequency band and the second partial frequency band to the receiver.

(CR), Multi-hop Relay, Relay Station, Resource Allocation

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and a method for transmitting / receiving data in a communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system, and more particularly, to a system and method for transmitting and receiving data in a CR (Cognitive Radio) communication system.

2. Description of the Related Art [0002] In the next generation communication system, active research is being conducted to provide users with services with various high-speed QoS (Quality of Service).

Particularly, in the current generation communication system, a plurality of cells constituting the communication system divide and use a limited resource, i.e., a frequency resource, a code resource, a time slot resource, Should be used efficiently. In addition, due to the rapid development of wireless communication system and the emergence of various services, the demand for wireless resources is increasing day by day. However, due to the fact that almost all commercially available frequency bands are allocated, a frequency resource for a new wireless platform is extremely short. If you look at the current frequency usage, there is little room available for the several GHz band, especially the low frequency band. In order to solve this frequency shortage problem, CR communication system based on CR method has been proposed. The CR communication system detects a frequency band that is allocated to a frequency but is not actually used, and can efficiently share and use the frequency band. Such a CR communication system is a communication system that can be used in connection with a next-generation communication system currently being studied.

However, even if the secondary system secures and uses frequency resources in the CR communication system, if the primary system intends to use the frequency band used by the CR communication system, The frequency band should be emptied immediately. Here, the main system means a communication system having a right to use a legitimate frequency band.

In addition, as described above, the subsystem measures the strength of a received signal in a frequency band selected for use by the subsystem itself in order to select and use a frequency band not used by the main system. That is, the subsystem measures the intensity of the received signal in the frequency band to detect a frequency band that is allocated to the main system but is not actually used. Then, the subsystem detects that the main system is not used in the predetermined frequency band through the measured intensity of the received signal, and selects and uses the sensed frequency band. At this time, the signal received by the subsystem may include an interference signal, for example, a transmission / reception signal of another subsystem, as well as a transmission / reception signal of the main system. If the strength of the received signal is above a certain level, That is, a predetermined frequency band in which the subsystem measures the strength of a signal for use, is used by another system

In the CR communication system, there is no concrete method of transmitting / receiving data by using a multi-hop relay system through a relay station (RS) I did.

Particularly, in the CR communication system, while the subsystem selects and uses a frequency band sensed using a multi-hop relay scheme via RS, that is, during transmission of data through the frequency band, A delay caused by the multi-hop, and a delay due to the transmission / reception mode change of the CR communication system.

Accordingly, the present invention proposes a system and method for transmitting and receiving data in a communication system.

The present invention also provides a system and method for transmitting and receiving data in a cognitive radio communication system.

Also, the present invention proposes a data transmission / reception system and method for reducing a data transmission delay according to a channel environment in a CR communication system using a multi-hop relay scheme.

In addition, the present invention proposes a system and method for transmitting and receiving data using different frequency bands in a CR communication system using a multi-hop relay scheme.

A method according to an embodiment of the present invention comprises: A method of transmitting and receiving data in a communication system, the method comprising the steps of: detecting a first frequency band not used in a primary cell of a second cell transmitter; Determining a first partial frequency band to be used for data transmission and reception with a receiver that is provided by a transmitter of the second cell among the partial frequency bands; Determining a second partial frequency band to be used for receiving feedback information including information on whether to change the first partial frequency band from a receiver, And transmitting the information to the receiver.

Another method according to an embodiment of the present invention comprises: A method of transmitting and receiving data in a communication system, the method comprising: receiving information on a first partial frequency band and a second partial frequency band from a receiver receiving a service from a transmitter of a secondary cell; Determining the first partial frequency band and the second partial frequency band based on the information on the second partial frequency band, performing the data transmission / reception with the transmitter using the first partial frequency band, And transmitting feedback information including information on whether to change the first partial frequency band to the transmitter using the first partial frequency band and the second partial frequency band, the second frequency band is included in the first frequency band that is not used in the primary cell.

Another method according to an embodiment of the present invention comprises: A method of transmitting and receiving data in a communication system, the method comprising the steps of: receiving a first partial frequency band from the transmitter and a second partial frequency band from the transmitter, Determining a first partial frequency band and a second partial frequency band based on the received information, and performing transmission and reception of data with the transmitter using the first partial frequency band And transmitting feedback information including information on whether to change the first partial frequency band to the transmitter using the second partial frequency band, And the two partial frequency bands are included in a first frequency band that is not used in the first cell .

An apparatus according to an embodiment of the present invention includes: A transmitter of a secondary cell in a communication system detects a first frequency band not used in a primary cell and divides the first frequency band into a plurality of partial frequency bands, Determining a first partial frequency band to be used for data transmission / reception with a receiver provided from a transmitter of the second cell among the partial frequency bands, and changing the first partial frequency band from the receiver among the partial frequency bands A second partial frequency band to be used for receiving feedback information including information on whether the first partial frequency band and the second partial frequency band should be transmitted to the receiver; And a transmission / reception unit for performing the data transmission / reception with the receiver and receiving the feedback information.

Another apparatus according to an embodiment of the present invention includes: A receiver for receiving a service from a transmitter of a secondary cell in a communication system, the receiver comprising: a transmitter and receiver for receiving information on a first partial frequency band and a second partial frequency band from the transmitter; Determining whether the first partial frequency band and the second partial frequency band are based on the first partial frequency band, performing data transmission / reception with the transmitter using the first partial frequency band, And a control unit controlling the transceiver to transmit feedback information including information on whether to change the first partial frequency band, wherein the first partial frequency band and the second partial frequency band are divided into a first cell Is included in a first frequency band that is not used in the first frequency band.

Another apparatus according to an embodiment of the present invention includes: A relay apparatus for relaying communication between a transmitter of a secondary cell in a communication system and a receiver receiving a service from the transmitter, the relay apparatus comprising: a transmitter for receiving information on a first partial frequency band and a second partial frequency band from the transmitter A first partial frequency band and a second partial frequency band based on the received information and performs transmission and reception of data with the transmitter using the first partial frequency band, And a controller for controlling the transmitter / receiver to transmit feedback information including information on whether to change the first partial frequency band to the transmitter using a frequency band, wherein the first partial frequency band and the second partial frequency band The frequency band is included in a first frequency band that is not used in a primary cell .

In a wireless cognitive communication system employing a multi-hop relay scheme, a base station of a subsystem allocates a partial frequency band for data transmission and reception when transmitting data through a relay station through which a relay path is established, It is advantageous to increase the efficiency of data transmission and reception by allocating a partial frequency band for transmission of feedback information.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The present invention proposes a system and method for transmitting and receiving data in a cognitive radio communication system. Hereinafter, the present invention will be described with reference to a first communication system, for example, an Institute of Electrical and Electronics Engineers (IEEE) 802.22 communication system and a second communication system such as a Broadband Wireless Access (BWA) (CR) communication system employing an IEEE 802.16 communication system as a communication system will be described as an example. However, the data transmission / reception system and method proposed by the present invention can be applied to other communication It goes without saying that the present invention can also be applied to systems.

Hereinafter, a CR communication system according to an embodiment of the present invention will be described with reference to FIG.

1 is a diagram illustrating a structure of a CR communication system according to an embodiment of the present invention.

Referring to FIG. 1, the CR communication system includes a cell 1 110 serving as a main system and a cell 2 150 serving as a subsystem cell. In the cell 1 110, A main system having usage rights, and a subsystem that does not have the right to use the frequency band but can use the frequency band when the main system does not use the frequency band in the cell 2 (150) do. The main system includes a BS1 112 serving as a primary BS and a MS1 114 serving as a primary MS provided with a communication service from the BS1 112, Hop relay path between the BS2 152 serving as a secondary BS and the MS2 154 serving as a secondary MS for receiving a communication service from the BS2 152 and the BS2 152 and the MS2 154. [ (RS) < / RTI >

At this time, the BS2 152 of the subsystem determines whether a frequency band in which the main system is authorized to use is a predetermined frequency band not used by the main system, that is, a usable frequency band of the subsystem, Search for a band. Accordingly, the subsystem transmits / receives data using the available first frequency band of the subsystem retrieved in the frequency band having the usage right by the main system, that is, the BS2 152, the RS (156), and MS2 (154) transmit and receive data using the available first frequency band.

Herein, the case where the BS2 152 senses a spectrum and searches for a usable frequency band is described. However, not only the RS 156 but also the MS2 154 can detect the spectrum and use the available frequency band, Of course, the system can search for usable frequency bands.

Then, the BS2 152 divides the frequency band having the usage right by the main system, that is, the first frequency band into a plurality of partial frequency bands, and allocates an arbitrary partial frequency band of the divided partial frequency bands To the RS 156. At this time, the BS2 152 allocates an index to the divided partial frequency bands. For example, it is assumed that the BS2 152 allocates the first partial frequency band # 1, the second partial frequency band # 2, and the third partial frequency band # 3. In addition, the BS2 152 includes a first partial frequency band for transmitting and receiving data to and from the RS 156 and a second partial frequency band for receiving and transmitting feedback information from the RS 156, Band is assigned to a dedicated frequency band.

When the BS2 152 and the RS 156 are unable to transmit and receive data through the first partial frequency band, the BS2 152 transmits and receives data through a partial frequency band different from the first partial frequency band, 2, a CR communication system using a multi-hop relay scheme according to an exemplary embodiment of the present invention will be described with reference to FIG. 2. FIG. 2 is a block diagram of a multi- do.

2 is a diagram illustrating a structure of a CR communication system using a multi-hop relay scheme according to an embodiment of the present invention.

Referring to FIG. 2, the CR communication system employing the multi-hop relay scheme includes a cell 1 210 in which a first main system BS 1 201 and a first sub system BS 2 203 coexist. Also, MS1 205, which is a secondary MS to receive communication service from BS2 203, and RS1 207 and RS2 207, which belong to the first secondary system and provide a multi-hop relay path, 209), and RS3 211. MS2 215, MS3 217 and MS4 219 which are MSs provided with communication services from RS1 207, RS2 209 and RS3 211, respectively.

The BS2 203 of the first sub-system may transmit a predetermined frequency band not used by the first main system, that is, a usable frequency band of the first sub-system, Search. Accordingly, the first sub system can transmit / receive data using the usable frequency band of the first sub system, which is searched in the frequency band having the use right of the first main system, that is, the BS2 (203) transmits and receives data using the usable frequency band. Hereinafter, the BS2 203, the RS1 207, the RS2 209, the RS3 211, the MS1 205, the MS2 215, the MS3 217, the MS4 217, 219 are assumed to transmit and receive data through the first partial frequency band of the usable first frequency band by spectrum sensing. It is assumed that BS2 203 of the first sub system transmits data to MS4 219. [

Here, a map message transmitted from the BS2 203 to the RS1 207 will be described in detail with reference to Table 1.

Referring to Table 1, the MAP message includes a Management Message Type parameter, a Transaction Identification parameter, an Urgent Coexistence Situation (UCS) indicating an emergency status, for example, A Number os channels parameter, a Confirmation Needed parameter, a Switch mode parameter, a Switch Count parameter, and the like.

In this case, if the BS2 203 determines that there is an extra partial frequency band outside the first partial frequency band as a result of the spectrum detection, the BS2 203 transmits the UCS channel allocation parameter to the RS1 207 When transmitting the MAP message, '1111' is inserted in the UCS channel allocation parameter and transmitted. Accordingly, upon receiving the MAP message, the RS1 207 transmits a feedback message through the second partial frequency band according to the UCS channel allocation parameter. At this time, the index of the partial frequency band to be used in the transmission of the next frame data, for example, the index of the third partial frequency band, is inserted into the number parameter of the channel and is transmitted.

On the other hand, when it is determined that the extra partial frequency band does not exist, the BS2 203 transmits '0000' to the UCS channel allocation parameter when transmitting the MAP message to the RS1 207. Accordingly, when the RS1 207 receives the MAP message, it recognizes that the feedback message transmitted by the RS1 in response to the UCS channel allocation parameter should be transmitted during the uplink time period.

More specifically, it is assumed that the BS transmits data to the RS1 through the first partial frequency band. At this time, the RS1 receives and decodes data from the BS, measures a channel state for the first partial frequency band, or measures whether or not another system is using the channel. If the channel condition of the first partial frequency band used by the BS to transmit data to the RS1 is poor or it is confirmed that the channel is used by another system, the RS1 transmits a feedback message to the BS. At this time, the feedback message includes an index corresponding to a new partial frequency band to be used when transmitting data in the next frame. Herein, as an example, it is assumed that data will be transmitted / received through the third partial frequency band.

Accordingly, the BS2 203 transmits the data to the RS1 207 using the first partial frequency band. Here, the RS1 207 receiving the data from the BS2 203 will be described as an RS that operates in a predetermined relaying mode, for example, a decoding and forward (DF) mode.

The RS1 207 receiving the data recognizes that the data is data to be transmitted to the MS 4 219, and transmits the data to the RS2 209. Then, the RS1 207 spectrums the first frequency band to measure a channel state of a first partial frequency band used by the BS2 203 for data transmission to the RS1 207, It also checks whether the frequency band is being used by another system. The RS1 207 recognizes that the first partial frequency band is used by another system, that is, the RS1 207 can not use the first partial frequency band. At this time, as described above, the RS1 207 selects a partial frequency band having the highest priority among the partial frequency bands allocated for reservation or randomly selects among the reserved partial frequency bands, Feedback information indicating that data is to be transmitted / received to / from the BS2 203 through a partial frequency band excluding the first and second partial frequency bands among a plurality of partial frequency bands divided in the first frequency band, To the BS2 203 via the second partial frequency band. Hereinafter, for convenience of description, it is assumed that feedback information indicating transmission / reception of data through the third partial frequency band is transmitted to the BS2 203 through the second partial frequency band. That is, the RS1 207 transmits feedback information to the BS2 203 through the second partial frequency band during a downlink time period. Next, the RS2 209 receiving the data recognizes that the data is data to be transmitted to the MS 4 219, and transmits the data to the RS3 211. Then, the RS2 209 spectrum-senses the first frequency band and measures a channel state of a first partial frequency band used by the RS1 207 for data transmission to the RS2 209, It also checks whether the frequency band is being used by another system. The RS2 209 recognizes that the first partial frequency band is used by another system, that is, the RS2 209 recognizes that the first partial frequency band is not used. At this time, the RS2 209 transmits feedback information indicating that data is to be transmitted / received through the third partial frequency band to the RS1 207 via the second partial frequency band. That is, the RS2 209 transmits feedback information to the RS1 207 through the second partial frequency band during the downlink time period.

Next, the RS3 211 receiving the data recognizes that the data is data to be transmitted to the MS 4 219, and transmits the data to the MS 4 219. Then, the RS3 211 spectrum-senses the first frequency band and measures a channel state of a first partial frequency band used by the RS2 209 for data transmission to the RS3 211, It also checks whether the frequency band is being used by another system. The RS3 211 recognizes that the first partial frequency band is used by another system, that is, it recognizes that the RS3 211 can not use the first partial frequency band. At this time, the RS3 211 transmits feedback information indicating transmission / reception through the third partial frequency band to the RS2 209 via the second partial frequency band. That is, the RS3 211 transmits feedback information to the RS2 209 through the second partial frequency band during the downlink time period.

Next, the MS 4 219 receiving the data decodes the data. Then, the MS 4 129 spectrum-senses the first frequency band and measures a channel state of a first partial frequency band used by the RS 3 211 for data transmission to the MS 4 219, It also checks whether the frequency band is being used by another system. The MS 4 219 recognizes that the MS 4 219 can not use the first partial frequency band, that is, the MS 4 219 recognizes that the first partial frequency band is used by another system. At this time, the MS 4 219 transmits feedback information indicating that data is to be transmitted / received through the third partial frequency band to the RS3 211 through the second partial frequency band. That is, the MS 4 219 transmits feedback information during the downlink time interval to the RS3 211 through the second partial frequency band.

Hereinafter, a frame structure in a CR communication system using a multi-hop relay scheme according to an embodiment of the present invention will be described with reference to FIG.

3 is a diagram illustrating a frame structure in a CR communication system using a multi-hop relay scheme according to an embodiment of the present invention.

3, the frame 300 includes a downlink (DL) frame 310, an uplink (UL) frame 350, .

The DL frame 310 includes an area in which the BS of the subsystem transmits data to RS1 existing in the cell managed by the BS itself and a region in which the RS1 transmits data to the RS2 in which the relay path is formed through the RS1 itself An area where the RS2 transmits data to the RS3 through which the relay path is formed through the RS2 itself and an area where the RS3 transmits data to the MS through which the relay path with the BS is formed through the RS3 itself.

The UL frame 350 includes an area where RS1 transmits data to the BS, an area where RS2 transmits data to RS1 where a relay path is formed through the RS2 itself, An area for transmitting data to the formed RS2, a BS for providing services to the MS, and an area for transmitting data to the MS itself and an RS3 in which a relay path is formed.

More specifically, the DL frame 310 includes a guard interval (Guard) for sensing the BS transmission region of the sub system and a sensing region 301 for sensing spectrum, A preamble area 303 for transmitting a synchronization signal for acquiring frame synchronization to an area for transmitting data in a DL-MAP area 305 for transmitting DL-MAP information and UL-MAP information, A UL-MAP region 307, and a first data transmission region (hereinafter, referred to as T1) 309 through which the BS of the subsystem transmits data to RS1.

In the CR communication system using the multi-hop relay scheme according to the embodiment of the present invention, the BS of the subsystem includes available frequency band information of the subsystem detected and searched in the frequency band having the right to use the main system, For example, the first partial frequency-domain information in the first frequency band is included in the DL-MAP information and is transmitted to the RS1 of the subsystem through the DL-MAP region 305. Also, the UL transmits search information indicating information on available frequency bands of the subsystem to the RS1 of the subsystem through the UL-MAP region 307, in the UL-MAP information.

In addition, the DL frame 310 includes a guard interval for distinguishing between the BS transmission area and the RS1 transmission area, a sensing area 311 for spectrally sensing RS1 of the subsystem to transmit data, A preamble field 313 for transmitting a synchronization signal for synchronization acquisition between RS1 and RS2 of the sub system as in the preamble field 303 to an area for transmitting data to RS2, MAP area 315 and UL-MAP area 317 for transmitting the first data transmission and the second data transmission for transmitting data to the RS2 of the sub system, that is, the RS2 in which the RS1 itself and the relay path are formed, (Hereinafter referred to as " T2 ").

In the CR communication system using the multi-hop relay scheme according to the embodiment of the present invention, RS1 of the subsystem includes spectrum sensing information and includes the spectrum sensing information in the DL-MAP information, Of RS2. Further, the UL transmits search information indicating information on available frequency bands of the subsystem to the RS2 of the subsystem through the UL-MAP area 317, in the UL-MAP information.

In addition, the DL frame 410 includes a guard interval for distinguishing between the RS1 transmission area and the RS2 transmission area, a sensing area 321 in which the RS2 of the subsystem performs spectral sensing to transmit data, A preamble field 323 for transmitting a synchronization signal for synchronization acquisition between RS2 and RS3 of the sub system as in the preamble field 303 to an area for transmitting data to RS3, MAP 325 and an UL-MAP region 327 for transmitting the third data transmission, which transmits data to the RS3 of the subsystem, that is, RS3 in which the RS2 itself and the relay path are formed, that is, (Hereinafter referred to as " T3 ").

In the CR communication system using the multi-hop relay scheme according to an embodiment of the present invention, RS2 of the subsystem includes spectrum sensing information and includes the spectrum sensing information in the DL-MAP information, Of RS3. In addition, the UL transmits search information indicating information on available frequency bands of the subsystem to the RS3 of the subsystem through the UL-MAP region 327 in the UL-MAP information.

In addition, the DL frame 410 includes a guard interval for distinguishing between the RS2 transmission area and the RS3 transmission area, a sensing area 331 for spectrally sensing the RS3 of the subsystem to transmit data, A preamble field 333 for transmitting a synchronization signal for synchronization acquisition between the RS 3 and the MS of the sub system, such as the preamble field 303, as an area for transmitting data to the MS, and a preamble field 333 for transmitting the DL- And a UL-MAP region 337 for transmitting the fourth data transmission (RS-MAP) 335 and an UL-MAP region 337 for transmitting data to the MS of the subsystem, (Hereinafter, referred to as 'TTG') as a protection interval for distinguishing the DL frame 310 from the DL frame 310 and the UL frame 350, and a transmission transition gap ).

In the CR communication system using the multi-hop relay scheme according to the embodiment of the present invention, RS3 of the subsystem includes spectrum sensing information and includes the spectrum sensing information in the DL-MAP information, Of the MS. Also, the UL transmits search information indicating information on available frequency bands of the subsystem to the MS of the subsystem through the UL-MAP region 337, including the UL-MAP information.

As described above, the BS, RS1, RS2, RS3, and MS of the subsystem are connected through a first partial frequency domain within a first frequency band that is a usable frequency band of the subsystem that the BS of the subsystem has detected by spectrum sensing And transmits the data.

After transmitting the data to the RS2, the RS1 measures a channel state of a first partial frequency band used by the BS for data transmission to the RS1, and determines whether the first partial frequency band is used by another system Check. If the RS1 confirms that the first partial frequency band is used by another user, the RS1 recognizes that the first partial frequency band can not be used. At this time, RS1 transmits (359) feedback information indicating that data is to be transmitted / received through the third partial frequency band to the BS through the second partial frequency band. That is, the RS1 transmits feedback information to the BS through the second partial frequency band during the downlink time period.

After transmitting the data to the RS3, the RS2 measures the channel state of the first partial frequency band used by the RS1 for data transmission to the RS2, and determines whether the first partial frequency band is used by another system Check. If the RS2 confirms that the first partial frequency band is used by another user, the RS2 recognizes that the first partial frequency band can not be used. At this time, RS2 transmits (361) RS1 to RS1 via the second partial frequency band, feedback information indicating that data is to be transmitted / received through the third partial frequency band. That is, the RS2 transmits feedback information to the RS1 through the second partial frequency band during the downlink time period.

After transmitting the data to the MS, the RS3 measures a channel state of the first partial frequency band used by the RS2 for data transmission to the RS3, and determines whether the first partial frequency band is used by another system Check. If the RS3 determines that the first partial frequency band is used by another user, the RS3 recognizes that the first partial frequency band can not be used. At this time, the RS3 transmits (363) the feedback information indicating that data is to be transmitted / received through the third partial frequency band to the RS2 through the second partial frequency band. That is, the RS3 transmits feedback information to the RS2 over the second partial frequency band during the downlink time period.

After receiving the data, the MS measures the channel state of the first partial frequency band used by the RS 3 for data transmission to the MS and also checks whether the first partial frequency band is used by another system. If the MS 4 confirms that the first partial frequency band is being used by another user, the MS 4 recognizes that the first partial frequency band can not be used. At this time, the MS 4 transmits (365) the feedback information indicating that data is to be transmitted / received through the third partial frequency band to the RS 3 through the second partial frequency band. That is, the MS 4 transmits feedback information to the RS 3 through the second partial frequency band during the downlink time period.

It is needless to say that the RS1, RS2, RS3, and MS do not transmit the channel status change report message when the first partial frequency band is not used by another user as a result of the spectrum detection.

The UL frame 350 includes a ranging region 343 for performing a ranging procedure and a fifth data transmission region (hereinafter referred to as T5) in which the RS1 transmits data to the BS 345).

In the CR communication system using the multi-hop relay scheme according to the present invention, RS1 recognizes that the RS1 has changed from the first partial frequency band to the third partial frequency band according to the feedback information transmitted during the DL time interval, The RS1 performs a ranging procedure with the BS, and then transmits data to the BS using a third partial frequency band.

The UL frame 350 includes a ranging region 347 for performing a ranging procedure and a sixth data transmission region (hereinafter referred to as T6) (hereinafter, referred to as " T6 " 349).

In the CR communication system using the multi-hop relay scheme according to the embodiment of the present invention, RS2 of the subsystem changes from the first partial frequency band to the third partial frequency band according to the feedback information transmitted during the DL time period The RS2 performs the ranging procedure with the RS1, and then transmits data to the RS1 using the third partial frequency band.

The UL frame 350 includes a ranging area 351 for performing a ranging procedure and a seventh data transmission area for transmitting data to the RS2 353).

In the CR communication system using the multi-hop relay scheme according to the embodiment of the present invention, RS3 of the subsystem changes from the first partial frequency band to the third partial frequency band according to the feedback information transmitted during the DL time period The RS 3 performs the ranging procedure with the RS 2, and then transmits data to the RS 2 using the third partial frequency band.

The UL frame 350 includes a ranging region 355 for performing a ranging procedure and an eighth data transmission region (hereinafter referred to as T8) in which the MS transmits data to the RS3 357).

In the CR communication system using the multi-hop relay scheme according to the embodiment of the present invention, the MS of the subsystem changes from the first partial frequency band to the third partial frequency band according to the feedback information transmitted during the DL time period The MS performs the ranging procedure with the RS3 and then transmits data to the RS3 using the third partial frequency band.

Next, the operation of the RS in the CR communication system using the multi-hop relay scheme according to the embodiment of the present invention will be described with reference to FIG.

4 is a diagram illustrating an RS operation in a CR communication system using a multi-hop relay scheme according to an embodiment of the present invention.

Referring to FIG. 4, in step 401, the RS 1 receives data from a BS and proceeds to step 403. In step 403, the RS 1 measures the first partial frequency band by spectrally detecting the channel state of the first partial frequency band, and proceeds to step 405. In step 405, the RS1 determines whether the first partial frequency band is usable, that is, whether the first partial frequency band is used by another system. If the first partial frequency band is available, the RS1 transmits the data to the RS2 via the first partial frequency band. On the other hand, if the first partial frequency band is not available, i.e., if the first partial frequency band is being used by another system, the RS1 transmits feedback information to the BS, i.e., uses the first partial frequency band And transmits feedback information indicating that the data is to be transmitted / received through the third partial frequency band to the BS via the second partial frequency band and terminates. At this time, the RS1 transmits the feedback information to the BS through the second partial frequency band during the downlink time period.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

1 illustrates a structure of a CR communication system according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a multi-hop relay (CR) communication system.

3 is a diagram illustrating a frame structure in a CR communication system to which a multi-hop relay scheme is applied according to an embodiment of the present invention.

4 is a diagram illustrating an RS operation of a subsystem in a CR communication system using a multi-hop relay scheme according to an embodiment of the present invention.

Claims (32)

A method of transmitting and receiving data in a communication system, Detecting a first frequency band in which a transmitter of a secondary cell is not used in a primary cell, Dividing the first frequency band into a plurality of partial frequency bands, Determining a first partial frequency band to be used for data transmission and reception with a receiver provided from a transmitter of the second cell among the partial frequency bands; Determining a second partial frequency band to be used for receiving feedback information including information on whether to change the first partial frequency band from the receiver among the partial frequency bands, And transmitting information on the first partial frequency band and the second partial frequency band to the receiver. The method according to claim 1, Performing data transmission and reception with the receiver using the first partial frequency band; Receiving the feedback information from the receiver using the second partial frequency band; When the information indicating that the first partial frequency band is changed to the third partial frequency band of the partial frequency bands is included in the feedback information, the transmitting and receiving of data with the receiver using the third partial frequency band Further comprising the steps of: The method according to claim 1, And transmitting to the receiver information on at least one partial frequency band that can be additionally used for communication with the transmitter, in addition to the first partial frequency band and the second partial frequency band, among the partial frequency bands / RTI > A method of transmitting and receiving data in a communication system, A receiver receiving a service from a transmitter of a secondary cell receives information on a first partial frequency band and a second partial frequency band from the transmitter, Determining the first partial frequency band and the second partial frequency band based on the received information; Transmitting and receiving data to and from the transmitter using the first partial frequency band; And transmitting feedback information including information on whether to change the first partial frequency band to the transmitter using the second partial frequency band, Wherein the first partial frequency band and the second partial frequency band are included in a first frequency band that is not used in a first cell. 5. The method of claim 4, The process of receiving the information comprises: Receiving from the transmitter information on at least one partial frequency band that can be additionally used for communication with the transmitter, in addition to the first partial frequency band and the second partial frequency band, among the partial frequency bands / RTI > 5. The method of claim 4, Wherein the step of transmitting the feedback information comprises: If it is determined that the use of the first partial frequency band is impossible during the data transmission / reception using the first partial frequency band, the first partial frequency band is divided into the third partial frequency band And transmitting information included in the feedback information to the transmitter. delete delete delete A method of transmitting and receiving data in a communication system, The method includes receiving a first partial frequency band and a second partial frequency band from a transmitter of a repeater relaying communication between a transmitter of a second cell and a receiver receiving a service from the transmitter, Determining the first partial frequency band and the second partial frequency band based on the received information; Transmitting and receiving data to and from the transmitter using the first partial frequency band; And transmitting feedback information including information on whether to change the first partial frequency band to the transmitter using the second partial frequency band, Wherein the first partial frequency band and the second partial frequency band are included in a first frequency band that is not used in a first cell. 11. The method of claim 10, The process of receiving the information comprises: Receiving from the transmitter information on at least one partial frequency band that can be additionally used for communication with the transmitter, in addition to the first partial frequency band and the second partial frequency band, among the partial frequency bands / RTI > 11. The method of claim 10, Wherein the step of transmitting the feedback information comprises: If it is determined that the use of the first partial frequency band is impossible during the data transmission / reception using the first partial frequency band, the first partial frequency band is divided into the third partial frequency band And transmitting information included in the feedback information to the transmitter. delete delete delete 13. The method of claim 12, Wherein the use of the first partial frequency band is impossible when the channel state value of the first partial frequency band is equal to or less than a threshold value. In a transmitter of a secondary cell in a communication system, A method of detecting a first frequency band not used in a primary cell, dividing the first frequency band into a plurality of partial frequency bands, and performing a service from the transmitter of the second cell among the partial frequency bands A receiver for receiving feedback information including information on whether to change the first partial frequency band from the receiver among the partial frequency bands to determine a first partial frequency band to be used for data transmission / A control unit for determining a second partial frequency band, And a transmitter and receiver for transmitting information on the first partial frequency band and the second partial frequency band to the receiver, performing data transmission and reception with the receiver, and receiving the feedback information. 18. The method of claim 17, The transmitting / Receiving the feedback information from the receiver using the second partial frequency band, and outputting the first partial frequency band to the feedback information using the first partial frequency band, And performs data transmission / reception with the receiver using the third partial frequency band when information indicating that the partial frequency band is changed to the third partial frequency band is included. 18. The method of claim 17, The transmitting / And transmits to the receiver information on at least one partial frequency band that can be additionally used for communication with the transmitter, in addition to the first partial frequency band and the second partial frequency band, among the partial frequency bands. transmitter. A receiver for receiving a service from a transmitter of a secondary cell in a communication system, A transceiver for receiving information on a first partial frequency band and a second partial frequency band from the transmitter; Determining the first partial frequency band and the second partial frequency band based on the received information, performing data transmission / reception with the transmitter using the first partial frequency band, and using the second partial frequency band And a controller for controlling the transmitter / receiver to transmit feedback information including information on whether to change the first partial frequency band to the transmitter, Wherein the first partial frequency band and the second partial frequency band are included in a first frequency band that is not used in a first cell. 21. The method of claim 20, The transmitting / Receiving from the transmitter information on at least one partial frequency band that can be additionally used for communication with the transmitter, in addition to the first partial frequency band and the second partial frequency band, among the partial frequency bands. . 21. The method of claim 20, Wherein, When it is determined that the use of the first partial frequency band is impossible during the data transmission / reception using the first partial frequency band, the control unit controls the transmission / reception unit so that the first partial frequency band is divided into 3 partial frequency band into the feedback information, and transmits the information to the transmitter. delete delete delete 1. A repeater relaying communication between a transmitter of a secondary cell in a communication system and a receiver receiving a service from the transmitter, A transceiver for receiving information on a first partial frequency band and a second partial frequency band from the transmitter; Determining the first partial frequency band and the second partial frequency band based on the received information, performing data transmission / reception with the transmitter using the first partial frequency band, and using the second partial frequency band And a controller for controlling the transmitter / receiver to transmit feedback information including information on whether to change the first partial frequency band to the transmitter, Wherein the first partial frequency band and the second partial frequency band are included in a first frequency band that is not used in a first cell. 27. The method of claim 26, The transmitting / Wherein the transmitter receives information on at least one partial frequency band that can be additionally used for communication with the transmitter in addition to the first partial frequency band and the second partial frequency band among the partial frequency bands. . 27. The method of claim 26, Wherein, When it is determined that the use of the first partial frequency band is impossible during the data transmission / reception using the first partial frequency band, the control unit controls the transmission / reception unit so that the first partial frequency band is divided into 3 partial frequency bands into the feedback information, and transmits the feedback information to the transmitter. delete delete delete 29. The method of claim 28, Wherein, And determines that the use of the first partial frequency band is impossible if the channel status value of the first partial frequency band is equal to or less than a threshold value.

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