KR20080023903A - Method and apparatus for transmitting data in a communication system - Google Patents

Abstract

A method and an apparatus for transmitting data in a communication system are provided to enable communication with various types of receiver by supporting the data transmission between a transmitter and a receiver in accordance with the information of the receiver in a communication system to which a TDD(Time Division Duplexing) scheme, an FDD(Frequency Division Duplexing) scheme, and a hybrid duplexing scheme are applied. An apparatus for transmitting data in a communication system comprises a MAP information creation part(312), a frame creation part(314), and a transmitter(316). If receiver information is received from a receiver, the MAP information creation part(312) creates MAP information in accordance with the receiver information. The frame creation part(314) creates frame information according to the created MAP information. The transmitter(316) transmits data to the receiver using the created frame information.

Description

METHOD AND APPARATUS FOR TRANSMITTING DATA IN A COMMUNICATION SYSTEM}

1 schematically illustrates the frame structure of a hybrid duplexing communication system.

2 is a diagram schematically illustrating a frame structure for data transmission and reception of a transmitter in a communication system according to an embodiment of the present invention.

3 schematically illustrates the structure of a transmitter in a communication system according to an embodiment of the present invention;

4 to 9 schematically illustrate a frame structure for data transmission and reception of a receiver in a communication system according to an embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system, and in particular, Time Division Duplexing (TDD) and Frequency Division Duplexing (FDD). The present invention relates to a data transmission method and apparatus in a communication system to which the method) and the hybrid duplexing method are applied.

The next generation of communication systems aims to support voice services as well as multimedia services of various traffic characteristics such as broadcast and real-time video conferences. Therefore, in order to efficiently provide such various services, a duplexing scheme considering asymmetry and continuity of uplink and downlink transmission according to service characteristics is required.

In addition, the next-generation communication system should be capable of variable asymmetrical services that efficiently provide multimedia traffic, and at the same time should be equipped with features that can reliably provide high data rates. The asymmetric service means that transmission speeds of downlink (DL: DownLink, hereinafter referred to as 'DL') and uplink (UL: UpLink, hereinafter called 'UL') are different from each other. Since the multimedia traffic receives a multimedia service from a mobile station (MS), which has mobility and fixedness, the multimedia traffic requires a higher transmission speed in the DL than the UL. In addition, the ratio of the asymmetry should be changeable.

On the other hand, the duplexing method used in the communication system may be classified into a TDD method and an FDD method. The TDD scheme implements bidirectional communication by dividing the same frequency band into time periods and alternately switching transmission and reception intervals, and the FDD scheme performs bidirectional communication by dividing a given frequency band into transmission and reception bands. .

In a communication system using the TDD scheme (hereinafter, referred to as a 'TDD communication system'), the BS may allocate some or all of the available time slots to the MS. It is possible. However, in the case of the TDD communication system, when the radius of the cell managed by the BS increases, a guard time between transmission and reception time slots increases due to a round trip delay. Therefore, it is not suitable to use the TDD scheme in a communication environment with a large cell radius such as a macro cell. In addition, in the TDD communication system, since the asymmetry ratio of each cell is not the same in a multi-cell environment, severe frequency interference occurs between MSs at adjacent edges of cells.

On the other hand, in a communication system to which the FDD scheme is applied (hereinafter, referred to as an 'FDD communication system'), since a frequency band for transmission and reception is divided, no time delay occurs for transmission or reception. Therefore, since there is no round trip delay due to time delay, it is suitable for a large cell environment such as a macro cell. However, in the FDD communication system, the transmission frequency band and the reception frequency band are fixed, which is not suitable for the duplexing method for variable asymmetric transmission.

Therefore, in consideration of various communication environments and traffic characteristics of a next-generation communication system, a hybrid duplexing scheme using both the TDD scheme and the FDD scheme is used in order to mix both duplexing schemes, that is, to obtain the advantages of the TDD scheme and the FDD scheme. There is a need for research. In response to this demand, a communication system using a hybrid duplexing scheme has been proposed, and a data transmission method and apparatus capable of supporting both the TDD scheme, the FDD scheme, and the hybrid duplexing scheme are needed.

Accordingly, an object of the present invention is to provide a data transmission method and apparatus in a communication system.

Another object of the present invention is to provide a data transmission method and apparatus in a communication system employing a TDD scheme, an FDD scheme, and a hybrid duplexing scheme.

In accordance with another aspect of the present invention, there is provided a data transmission method in a communication system, when receiving receiver information from a receiver, generating MAP information corresponding to the receiver information, and generating the MAP information. After the corresponding frame information is generated, transmitting the data to the receiver using the generated frame information.

An apparatus of the present invention for achieving the above object is, in a data transmission apparatus in a communication system, when receiving receiver information from a receiver, a MAP information generation unit for generating MAP information corresponding to the receiver information, and the generated And a frame generator for generating frame information corresponding to MAP information, and a transmitter for transmitting data to the receiver using the generated frame information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

The present invention proposes a data transmission method and apparatus in a communication system. Here, in the embodiment of the present invention to be described later, a communication system (hereinafter, referred to as a 'TDD communication system') and frequency division to which a time division duplexing (TDD) scheme is applied A communication system (hereinafter referred to as an 'FDD communication system') to which a frequency division duplexing (FDD) method is applied, and a hybrid duplexing using both the TDD method and the FDD method Although a data transmission method and apparatus are described as an example in a communication system employing a duplexing method (hereinafter, referred to as a 'hybrid communication system'), the data transmission method and apparatus proposed by the present invention may be applied to other communication systems. Can be.

In addition, the present invention is a transmitter, for example, a base station (BS (hereinafter referred to as "BS")) in a hybrid communication system, a receiver, for example, a mobile station employing a variety of methods, such as the hybrid, TDD, FDD The present invention proposes a method and apparatus for transmitting data to a mobile station (hereinafter referred to as MS). In an embodiment of the present invention to be described later, the transmitter not only receives data from a signal received from the receiver, that is, uplink (UL), but also receives information of the receiver. After generating MAP information corresponding to the received information of the receiver, data is transmitted to the receiver through downlink (DL: hereinafter referred to as 'DL') according to the generated MAP information. In this case, the transmitter generates MAP information so that data can be transmitted to the receiver according to receiver information received from the receiver, that is, information about a communication method of the receiver, and generates frame information corresponding to the generated MAP information. Then, the data to be transmitted to the receiver is modulated and transmitted according to the generated frame information. That is, according to the present invention, the transmitter generates MAP information according to communication method information of each receiver using various methods, that is, UL and DL resource information of each receiver, and transmits data to each receiver corresponding to the MAP information. . Next, a frame structure of a communication system using a hybrid duplexing scheme will be described in detail with reference to FIG. 1.

1 is a diagram schematically illustrating a frame structure of a hybrid duplexing communication system.

Referring to FIG. 1, the frame has a two-dimensional structure by a frequency domain and a time domain, and the frequency domain is divided into a TDD region and an FDD UL region 103, and the TDD region and the TDD region. There is a guard band between the FDD UL regions 103. The TDD region is divided into a TDD DL region 101 and a TDD UL region 105, and a guard time exists between the TDD DL region 101 and the TDD UL region 105.

In this way, the hybrid duplexing method, by applying the FDD method, divides the frequency domain into two regions through two center frequencies f ₁ and f _2. The first central frequency f ₁ region is an FDD UL region 103. The resource is divided and allocated, and the second center frequency f ₂ region is divided into a TDD DL region 101 and a TDD UL region 105 to allocate resources. In addition, by dividing the time domain into two time interval regions, one time interval region allocates resources to the TDD DL region 101 and the other time interval region allocates resources to the TDD UL region 105. In this case, the FDD UL region 101 allocates resources for all time periods. Next, a frame structure for data transmission and reception of a transmitter in a hybrid communication system according to an embodiment of the present invention will be described in detail with reference to FIG. 2.

2 is a diagram schematically illustrating a frame structure for data transmission and reception of a transmitter in a communication system according to an embodiment of the present invention.

Referring to FIG. 2, the frame has a two-dimensional structure by a frequency domain and a time domain as described above, and the frequency domain is divided into two regions through two center frequencies f ₁ and f ₂ . It is divided into one center frequency f ₁ region and a second center frequency f ₂ region. In this case, the first center frequency f ₁ region is allocated to the UL region 203 for all time periods, and the second center frequency f ₂ region is applied to the DL region 201 and the UL region (TDD) by applying a TDD scheme. 205).

When resources are allocated in the frequency domain and the time domain in this manner, the transmitter transmits data to the receivers through the DL region 201 and the UL region of the two center frequencies (f ₁ , f ₂ ) region from the receivers. Receive data via (203, 205). In this case, since the UL region 203 is allocated to the time period of the DL region 201, the transmitter can bidirectionally communicate with the receivers. Next, the structure of the transmitter in the communication system according to the embodiment of the present invention will be described in detail with reference to FIG. 3.

3 is a diagram schematically illustrating a structure of a transmitter in a communication system according to an embodiment of the present invention.

Referring to FIG. 3, the transmitter includes a transmitter 310 for transmitting data to receivers and a receiver 320 for receiving data and receiver information, for example, MS information, from the receivers. The transmitter 310 generates a MAP information generator 312 for generating MAP information for data transmission and reception with the receivers according to receiver information received from the receivers, ie, MS information, through the receiver 320. ), A frame generator 314 for generating frame information of each receiver according to the data to be transmitted to each receiver and the MAP information received from the MAP information generator 312, and frame information of each receiver. Correspondingly modulates data to be transmitted to each receiver and modulates and transmits it to each receiver via the DL region 201 of FIG. 2 as described above. Here, the frame generation unit 314 generates control information as well as frame information of each receiver according to the received MAP information and data, and the modulator / transmitter 316 transmits data to be transmitted to each receiver. Modulated into a DL signal of the TDD scheme to be transmitted through the area 201 and transmitted to each of the receivers.

The receiver 320 receives a first demodulator / receiver 322 and a second demodulator / receiver 324 for receiving and demodulating a signal received from each receiver, and a signal demodulated by each demodulator / receiver 322,324. Signal detection units 326 and 328 which detect and output data received from each receiver and information of each receiver, that is, MS information. Here, the first demodulator / receiver 322 and the second demodulator / receiver 324, as described above, the UL data and TDD of the FDD scheme received from each receiver through the two UL regions 203 and 205 of FIG. Demodulate the UL data of the scheme. Next, a frame structure for data transmission and reception of a receiver in a communication system according to an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 9.

4 is a diagram schematically illustrating a frame structure for data transmission and reception of a receiver in a communication system according to an embodiment of the present invention.

Referring to FIG. 4, the frame has a two-dimensional structure by a frequency domain and a time domain, and the frequency domain is divided into two regions through two center frequencies f ₁ and f ₂ . f ₁ ) is divided into a region and a second center frequency f ₂ . In this case, the first center frequency f ₁ region is allocated to the UL region 403 for all time periods, and the second center frequency f ₂ region is applied to the DL region 401 and the UL region (TDD) by applying a TDD scheme. 405).

When the resource is allocated in the frequency domain and the time domain by applying the hybrid duplexing scheme, the receiver receives data from the transmitter through the DL region 401 and transmits two center frequencies f ₁ and f ₂ to the transmitter. Data is transmitted through UL regions 403 and 405 of the region. In this case, since the UL region 403 is allocated to a time period of the DL region 401, the receiver may bidirectionally communicate with the transmitter. In addition, the receiver of the hybrid duplexing scheme in which the DL region 401 and the UL region 403 and 405 are allocated may receive data transmitted by the modulator / transmitter 316 of the transmitter through the DL region 401 as described with reference to FIG. 3. When the receiver transmits data to the transmitter through the UL regions 403 and 405, the first and second demodulator / receivers 322 and 324 of the transmitter receive and demodulate the data transmitted through the UL regions 403 and 405.

5 is a diagram schematically illustrating a frame structure for data transmission and reception of a receiver in a communication system according to an embodiment of the present invention.

Referring to FIG. 5, the frame has a two-dimensional structure by a frequency domain and a time domain, and the frequency domain is divided into one region through one center frequency f ₂ . In this case, one center frequency f ₂ is allocated to the DL region 501 and the UL region 503 by applying the TDD scheme, and resources are not allocated to the other center frequency f ₁ region.

When resources are allocated in the frequency domain and the time domain by applying the TDD scheme, the receiver receives data from the transmitter through the DL region 501 and transmits data through the UL region 503 to the transmitter. That is, the receiver transmits and receives data through the DL region 501 and the UL region 503 at different times in one center frequency f ₂ region. In addition, the TDD receiver having the DL region 501 and the UL region 503 allocated thereto receives data transmitted by the modulator / transmitter 316 of the transmitter through the DL region 501 as described with reference to FIG. 3. When the receiver transmits data through the UL region 503 to the transmitter, the second demodulator / receiver 324 of the transmitter receives and demodulates the data transmitted through the UL region 503.

6 is a view schematically showing a frame structure for data transmission and reception of a receiver in a communication system according to an embodiment of the present invention.

Referring to FIG. 6, the frame has a two-dimensional structure by a frequency domain and a time domain, and the frequency domain is divided into two regions through two center frequencies f ₁ and f ₂ . f ₁ ) is divided into a region and a second center frequency f ₂ . In this case, the first center frequency f ₁ region is allocated to the UL region 603 for all time periods, and the second center frequency f ₂ region is allocated to the DL region 601. Here, the second center frequency (f ₂₎ area is not allocated the UL region 405 assigned to the second center frequency (f ₂₎ area in FIG. 4.

When resources are allocated in the frequency domain and the time domain by applying the FDD scheme, the receiver receives data from the transmitter through the DL region 601 allocated to the second center frequency f ₂ region, and the transmitter Data is transmitted through the UL region 603 allocated to the first center frequency f ₁ region. In this case, since the UL region 603 is allocated to a time period of the DL region 601, the receiver may bidirectionally communicate with the transmitter. In addition, the FDD-type receiver to which the DL region 601 and the UL region 603 are allocated receives data transmitted by the modulator / transmitter 316 of the transmitter through the DL region 601 as described with reference to FIG. 3. When the receiver transmits data through the UL region 603 to the transmitter, the first demodulator / receiver 322 of the transmitter receives and demodulates the data transmitted through the UL region 603.

7 is a diagram schematically showing a frame structure for data transmission and reception of a receiver in a communication system according to an embodiment of the present invention.

Referring to FIG. 7, the frame has a two-dimensional structure by a frequency domain and a time domain, and the frequency domain is divided into two regions through two center frequencies f ₁ and f ₂ . f ₁ ) is divided into a region and a second center frequency f ₂ . In this case, the first center frequency f ₁ region is allocated to the UL region 703 and the second center frequency f ₂ region is allocated to the DL region 701 and the UL region 705 by applying a TDD scheme. do. Here, the UL region 703 allocated to the first center frequency f ₁ region is not allocated during the time period of the UL region 705 allocated to the second center frequency f ₂ region. That is, the receiver does not transmit data to the transmitter over the same period of time for between the first center frequency (f ₁₎ area and a second center frequency (f ₂₎ region.

When resources are allocated in the frequency domain and the time domain by applying the hybrid duplexing scheme, the receiver receives data from the transmitter through the DL region 701 and transmits two center frequencies f ₁ and f ₂ to the transmitter. Data is transmitted through UL regions 703 and 705 in the region. In this case, since the UL region 703 is allocated to the time period of the DL region 701, the receiver can bidirectionally communicate with the transmitter. In addition, the receiver of the hybrid duplexing method in which the DL region 701 and the UL region 703 and 705 are allocated may receive data transmitted by the modulator / transmitter 316 of the transmitter through the DL region 701 as described with reference to FIG. 3. When the receiver transmits data to the transmitter through the UL regions 703 and 705, the first and second demodulator / receivers 322 and 324 of the transmitter receive and demodulate the data transmitted through the UL regions 703 and 705.

8 is a diagram schematically showing a frame structure for data transmission and reception of a receiver in a communication system according to an embodiment of the present invention.

Referring to FIG. 8, the frame has a two-dimensional structure by a frequency domain and a time domain, and the frequency domain is divided into two regions through two center frequencies f ₁ and f ₂ . f ₁ ) is divided into a region and a second center frequency f ₂ . In this case, the first center frequency f ₁ region is allocated to the UL regions 809, 811, 813, 815, and the second center frequency f ₂ region is allocated to the DL regions 801, 803, 805, 807. Here, the second center frequency (f ₂₎ area is not allocated the UL region 405 assigned to the second center frequency (f ₂₎ area in FIG. 4. In addition, the DL regions 801, 803, 805, 807 and the UL regions 809, 811, 813, 815 are not allocated during the same time period.

When resources are allocated in the frequency domain and the time domain by applying the FDD scheme, the receiver receives data from the transmitter through the DL regions 801, 803, 805, and 807 allocated to the second center frequency f ₂ region, and transmits the data to the transmitter. Data is transmitted through the UL regions 809, 811, 813, 815 allocated to the 1 center frequency f ₁ region. In this case, since the UL regions 809, 811, 813, 815 are not allocated to the time periods of the DL regions 801, 803, 805, and 807, the receiver cannot bidirectionally communicate with the transmitter. In addition, the FDD-type receiver allocated to the DL regions 801, 803, 805, 807 and the UL regions 809, 811, 813, 815 receives data transmitted by the transmitter / modulator 316 through the DL regions 801, 803, 805, 807, as described in FIG. When the receiver transmits data to the transmitter through the UL regions 809, 811, 813, 815, the first demodulator / receiver 322 of the transmitter receives and demodulates the data transmitted through the UL regions 809, 811, 813, 815.

9 is a diagram schematically showing a frame structure for data transmission and reception of a receiver in a communication system according to an embodiment of the present invention.

Referring to FIG. 9, the frame has a two-dimensional structure by a frequency domain and a time domain, and the frequency domain is divided into two regions through two center frequencies f ₁ and f ₂ . f ₁ ) is divided into a region and a second center frequency f ₂ . In this case, the first center frequency f ₁ region is allocated to the UL regions 909, 911 and 913, and the second center frequency f ₂ region is allocated to the DL regions 901, 903, 905, 907 and the UL region 915 by applying a TDD scheme. do. Here, the UL regions 909, 911, and 913 allocated to the first center frequency f ₁ region are not allocated during the time period of the UL region 915 allocated to the second center frequency f ₂ region. That is, the receiver does not transmit data to the transmitter over the same period of time for between the first center frequency (f ₁₎ area and a second center frequency (f ₂₎ region. In addition, the DL regions 901, 903, 905, 907 and the UL regions 909, 911, 913, 915 are not allocated for the same time period.

When the resource is allocated in the frequency domain and the time domain by applying the hybrid duplexing scheme, the receiver receives data from the transmitter through the DL regions 901, 903, 905, and 907, and transmits two center frequencies f ₁ and f ₂ to the transmitter. Data is transmitted through the UL regions 909,911,913,915 of the region. In this case, since the UL regions 909, 911, 913, and 915 are not allocated to the time periods of the DL regions 901, 903, 905, and 907, the receiver cannot bidirectionally communicate with the transmitter. In addition, the hybrid duplexing receiver in which the DL regions 901, 903, 905, 907 and the UL regions 909, 911, 913, 915 are allocated may transmit data transmitted by the transmitter / modulator 316 through the DL regions 901, 903, 905, 907 as described in FIG. 3. When the receiver transmits data to the transmitter through the UL region 909, 911, 913, 915, the first and second demodulator / receiver 322, 324 of the transmitter receives and demodulates the data transmitted through the UL region 909, 911, 913, 915. .

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 the equivalents of the claims.

As described above, the present invention supports data transmission between transceivers according to receiver information in a communication system employing the TDD method, the FDD method, and the hybrid duplexing method, thereby enabling communication with various receivers, and the complexity of the system. Can be reduced.

Claims (14)

In a data transmission method in a communication system, Receiving MAP information from the receiver, generating MAP information corresponding to the receiver information; Generating frame information corresponding to the generated MAP information, and then transmitting data to the receiver using the generated frame information. The method of claim 1, The generating of the MAP information may include generating resource allocation information corresponding to receiver information of a time division duplexing (TDD) method. The method of claim 1, The generating of the MAP information may include generating resource allocation information corresponding to receiver information of a frequency division duplexing (FDD) method. The method of claim 3, The generating of the MAP information may include generating resource allocation information so that uplink resources and downlink resources are not allocated during the same time period. The method of claim 1, The process of generating the MAP information includes resources corresponding to receiver information of a hybrid duplexing method using a time division duplexing (TDD) method and a frequency division duplexing (FDD) method. And data for generating allocation information. The method of claim 5, The generating of the MAP information may include generating resource allocation information so that uplink resources are not allocated during the same time period. The method of claim 5, The generating of the MAP information may include generating resource allocation information so that uplink resources and downlink resources are not allocated during the same time period. A data transmission apparatus in a communication system, A MAP information generator for generating MAP information according to the receiver information when receiving receiver information from a receiver; A frame generator for generating frame information corresponding to the generated MAP information; And a transmitter for transmitting data to the receiver using the generated frame information. The method of claim 8, The MAP information generation unit generates resource allocation information according to time division duplexing (TDD) receiver information. The method of claim 8, The MAP information generation unit generates resource allocation information corresponding to the receiver information of the frequency division duplexing (FDD) method. The method of claim 10, The MAP information generation unit, characterized in that for generating the resource allocation information so that uplink resources and downlink resources are not allocated during the same time period. The method of claim 8, The MAP information generation unit may allocate resource allocation information corresponding to receiver information of a hybrid duplexing scheme using a time division duplexing (TDD) scheme and a frequency division duplexing (FDD) scheme. Generating a data transmission device. The method of claim 12, The MAP information generation unit, characterized in that for generating the resource allocation information so that uplink resources are not allocated during the same time period. The method of claim 12, The MAP information generation unit, characterized in that for generating the resource allocation information so that uplink resources and downlink resources are not allocated during the same time period.

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