KR20080030475A - Method and apparatus for composition of a frame in a communication system - Google Patents

Abstract

A method and an apparatus for constructing a frame in a communication system are provided to rapidly transmit data in real time and improve transmission efficiency through closed loop control by having short latency. A method for constructing a frame(400) in a communication system includes the steps of: generating a first zone supporting compatibility with other communication systems in a first sub-frame; generating at least one second zone as a reverse link of the first sub-frame on the other zones except for the first zone in the first sub-frame; generating a third zone as a reverse link of the second sub-frame in the second sub-frame; and constructing the frame including the first zone, the second zone, and the third zone.

Description

METHOD AND APPARATUS FOR COMPOSITION OF A FRAME IN A COMMUNICATION SYSTEM}

The present invention relates to a method and apparatus for constructing a frame in a communication system.

In this specification, a case of the Institute of Electrical and Electronics Engineers (IEEE) 802.16e communication system will be described as an example.

1A is a diagram illustrating a frame structure of a general IEEE 802.16e communication system. The IEEE 802.16e communication system is called Time Division Duplex (TDD) mode and Orthogonal Frequency Division Multiple Access (OFDMA). It is a communication system based on the method.

Referring to FIG. 1A, a frame of the TDD-OFDMA communication system includes a downlink (DL) subframe and an uplink (UL) subframe. The subframes include a time interval for operation switching, that is, a transmission / reception time gap (TTG) and a reception / transmission time interval (RTG: reception). / transmission Time Gap, hereinafter referred to as 'RTG'). In the DL subframe, a preamble is located at the foremost end, and the next section is a first zone (hereinafter, referred to as a '1 ^st region'), which is a section for transmitting control information, and a section for transmitting substantial DL data. A plurality of OFDMA burst areas (DL burst # 1 ~ DL burst # 5) that is a period. The UL subframe includes a plurality of OFDMA burst regions (UL burst # 1 to UL burst # 5) which are sections for ranging and sections for transmitting data. The dotted lines represented by UL ranging and OFDMA burst regions can be dynamically allocated according to circumstances.

Referring to FIG. 1B, the DL subframe and the UL subframe are configured with a plurality of different areas according to the subchannel configuration.

Information about a plurality of regions constituting the DL subframe and the UL subframe (hereinafter, referred to as region configuration information) is, for example, control information located in a '1 ^st region' following a preamble of the DL subframe. It is included in the transmission to the terminal. The '1 ^st region' is configured in a fixed subchannel scheme, and the region configuration information is designated using STC_DL_Zone_Switch_IE () or AAS_DL_IE (), or UL_Zone_Switch_IE when the region configuration information is located in the UL subframe. Specify using () or AAS_UL_IE (). In this case, the solid line region including the preamble and the '1 ^st region' indicates a fixed slot, and the region indicated by a dotted line indicates a variable region whose size and existence of the region can be changed according to a cell environment and operation. Shown.

2A is a data flow diagram of a hybrid automatic repeat reQuest (HARQ) operation for DL transmission in a typical IEEE 802.16e communication system. Here, the communication system is considered a wireless broadband system profiled in Mobile WiMAX (HARMAX), HARQ follows a data transmission scheme based on the TDD frame of 5ms length.

Referring to FIG. 2A, the terminal designates burst allocation information and a feedback region in the UL in an information element in the first region 208 of the (i-1) th frame 200, and assigns the burst allocation. According to the information, the base station transmits traffic in the corresponding burst area. Thereafter, the terminal decodes the burst allocation information and the traffic, and transmits an ACK or NACK message according to whether an error of demodulated traffic is detected in the UL subframe period of the i-th frame 202, which is the next frame after data transmission is performed. Feedback to the base station. The base station decodes the feedback of the terminal during the (i + 1) th frame 204, and performs scheduling and encoding for data transmission and retransmission. Thereafter, the base station transmits and retransmits the traffic transmitted in the (i-1) frame 200 in the (i + 2) th frame 206.

In the frame structure of FIG. 2A, since the retransmission of data transmitted in the (i-1) th frame 200 is performed in the (i + 2) th frame 206, the latency 210 totals three frames 200. HARQ retransmission delay (delay) 210 occurs for DL data transmission by 15 ms, that is, intervals 202 and 204.

2B is a data flow diagram of a hybrid automatic repeat request (HARQ) operation for UL transmission in a typical IEEE 802.16e communication system. Herein, the communication system is considered a wireless broadband system profiled in Mobile WiMAX, and HARQ follows a data transmission scheme based on a TDD frame having a length of 5ms.

The terminal is allocated a burst for UL transmission from the information element in the first region 222 in the (i-1) th frame 211. Thereafter, the terminal transmits data in the corresponding burst region of the Ii-th frame 212 according to the allocation information. Thereafter, the base station demodulates the data transmitted by the terminal during the (i + 1) th frame 214, generates a feedback message (ACK / NACK) according to whether an error is detected, and transmits data according to the determination result. After the scheduling is performed, allocation information and feedback are encoded and transmitted during the (i + 2) th frame 216. Thereafter, the terminal performs retransmission and new transmission on the traffic transmitted in the (i) th frame 212 in the (i + 3) th frame 218. Here, i is a sequence indicator of the frame.

In the frame structure of FIG. 2B, since retransmission of the data transmitted in the (i) th frame 212 is performed in the (i + 3) th frame 218, the UL frame is divided into three frames 214, 216, and 218 for 15 ms. A total HARQ retransmission delay 220 for data transmission occurs.

 In addition, when one or more frame sections are consumed due to a processing delay according to data transmission / reception processing, the HARQ latency may be further increased. As described above, the feedback delay such as HARQ latency is the performance of closed loop control such as transmission control protocol, data throughput, automatic repeat reQuest (ARQ) / HARQ, and power control. There was a problem that had a serious effect on the.

It is an object of the present invention to provide a reliable real time data transmission method and apparatus in a communication system.

Another object of the present invention is to provide a method and apparatus for real-time data transmission having a short latency that supports HARQ support for a real-time service and link adaptation for a fast moving speed in a communication system.

In accordance with an aspect of the present invention, a method for constructing a frame including a first subframe and a second subframe in a communication system is provided. Generating a first region that supports compatibility with other communication systems; and creating a second region that is a reverse link of at least one of the first subframes in the remaining regions other than the first region in the first subframe. Generating a third region that is a reverse link of the second subframe from the second subframe, and forming a frame including the first region, the second region, and the third region Process.

An apparatus according to another embodiment of the present invention is a device that configures a frame including a first subframe and a second subframe in a communication system, and supports compatibility with other communication systems in the first subframe. A first region is generated, and a second region, which is a reverse link of at least one of the first subframes, is generated within the remaining regions other than the first region in the first subframe, and in the second subframe. And generating a third region, which is a reverse link of the second subframe, and constituting a frame including the first region, the second region, and the third region.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes can be made without departing from the spirit of the present invention. It will be apparent to those who have knowledge.

The present invention provides a method and apparatus for constructing a frame capable of satisfying a short latency by inserting reverse link sections of corresponding subframes in a plurality of time domains with a fixed control information transmission section in a broadband wireless access system. It is possible to obtain transmission efficiency by real-time data transmission and closed loop control.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, it should be noted that in the drawings, the same components or parts denote the same reference numerals as much as possible. In describing the present invention, detailed descriptions of related well-known functions or configurations are omitted in order not to obscure the subject matter of the present invention.

Hereinafter, the present invention proposes a frame configuration method and apparatus having a short latency to improve the transmission efficiency while providing compatibility between an existing system and an advanced system that provides an advanced service in a communication system. Here, the advanced system is an existing system, for example, a broadband wireless communication system that is not only compatible with an existing system that provides a commercialization service according to the IEEE 802.16e standard or a mobile WiMAX authentication profile, but also can implement higher performance than the existing system. For example, but it is also applicable to other systems, of course.

Specifically, in the first embodiment of the present invention, in order to reduce the processing time between data transmission and reception, each subframe section may be configured with a plurality of time domains, and scheduling and control may be performed for each time domain. Control information in the corresponding time domain is designated in each time domain.

In addition, the control channel section of the existing service is provided as a fixed region for compatibility with the frame configuration method of the existing system, and the corresponding UL / DL resource is allocated according to a predetermined UL / DL ratio for the remaining sections except the fixed region. It consists of multiple UL / DL time domains (short PHYs). The fixed area includes a preamble composed of one symbol and a partial usage of sub channel (PUSC), which is a 1 ^st area for transmitting burst allocation and control information, for compatibility with an existing system. / UL consists of fixed domains independent of the time domains.

Additionally, in order to support an advanced service requiring a short latency, a method for enabling fast feedback and transmission by configuring at least one or more regions of the plurality of time regions constituting the subframe as regions of the reverse link of the subframe. Suggest. That is, at least one or more time domains among the plurality of time domains constituting the DL subframe are configured as a 'UL short PHY' for UL transmission, and among the plurality of time domains constituting the UL subframe. At least one time domain is configured as a 'DL short PHY' for DL transmission.

3 is a view showing a frame configuration method according to a first embodiment of the present invention.

Referring to FIG. 3, the frame 300 is divided into a DL subframe 302 and a UL subframe 304. The DL subframe 302 configures a fixed section 306 for compatibility with the existing system. The fixed region 306 includes a preamble composed of one symbol and burst allocation and control information composed of a partial usage of subchannel (PUSC) in a 1 ^st region following the preamble. That is, the fixed region 306 is an interval independent of the remaining OFDMA symbol intervals, and configures the remaining OFDMA symbol intervals excluding the fixed region 306 in the entire frame 300 as the time domain 308. Thereafter, the time domain frames 308 are allocated as a period for DL / UL transmission of a predetermined ratio of DL / UL, for example, M: N ratio. In this case, M is the number of DL time-domain frames in the entire frame 300, and N is the number of UL time-domain frames in the entire frame 300.

4 is a view showing a frame configuration method according to a second embodiment of the present invention. Here, a predetermined region of each of the control channel of the DL and the control channel of the UL is set as a fixed region. That is, the fixed region of the DL subframe is set as shown in FIG. 3, and one time region is configured as a fixed region within the UL subframe. The DL / UL fixed region preferentially supports control information in an existing system and may be used in an advanced system. In addition, the fixed region may be used not only for transmitting control information but also for other purposes, for example, for data transmission. Here, the fixed region may be supported by a subchannel allocation scheme that can be supported by an existing service in consideration of compatibility with an existing service. PUSC). Meanwhile, in the advanced system, the remaining time domains except the fixed region may be configured by a subchannel allocation method and a control method different from the existing system.

Referring to FIG. 4, the frame 400 includes a DL subframe 402 including a DL fixed region 406 for a DL control channel, and a UL subframe including a UL fixed region 408 for a UL control channel. 404. The DL fixed region 406 starts with a preamble consisting of one symbol, and the burst allocation and control information consisting of PUSC after the preamble includes a 1 ^st region 406. The UL fixed region 408 consists of one time domain in which a UL control channel composed of UL PUSCs is located. Thereafter, the frame 400 divides the remaining OFDMA symbol intervals except for the DL fixed region 406 and the UL fixed region 408 into arbitrary time domain units, and each time domain has a predetermined UL / DL ratio. Is allocated to the DL / UL transmission interval according to the M: N ratio. Here, M is the number of time domains for DL transmission in the whole frame, and N is the number of time domains for UL transmission in the whole frame. Here, the number of OFDMA symbols constituting the time domain is determined in consideration of the size of the region (number of symbols), the frame length (number of symbols) of the existing service, a subchannel allocation scheme, and latency. In this case, the number of symbols constituting the time domain may vary according to the size of the region of each subframe.

5A is a diagram illustrating an example of an advanced frame structure in which a DL subframe and a UL subframe have the same fixed region size according to the second embodiment of the present invention. Here, the parameters will be described using the case where the DL: UL ratio is 17:15 in the 5ms frame structure supporting 8.75MHz bandwidth, which is one of the mobile WiMAX profiles, and the size of each time domain is an example. However, the size of the time domain may vary depending on the situation.

Referring to FIG. 5A, a frame includes a fixed region 506 of a DL subframe and a fixed region 510 of a UL subframe, each consisting of three symbols, except for the fixed regions 506 and 510. The regions are organized in units of one time domain frame 508, which consists of six symbols.

FIG. 5B illustrates an example of an advanced frame structure in which DL subframes and UL subframes have different fixed region sizes according to the second embodiment of the present invention. Here, the parameters will be described using the case where the DL: UL ratio is 17:15 in a 5ms frame structure supporting 8.75MHz bandwidth, which is one of the mobile WiMAX profiles, and the size of each time domain is an example.

Referring to FIG. 5B, the DL fixed region 512 of the DL subframe consists of three symbols, the fixed region 516 of the UL subframe consists of six symbols, and one time-domain frame 514. ) Consists of 9 symbols.

FIG. 5C is a diagram illustrating another example of an advanced frame structure in which DL subframes and UL subframes have different fixed region sizes according to the second embodiment of the present invention. Here, the parameters will be described using the case where the DL: UL ratio is 17:15 in a 5ms frame structure supporting 8.75MHz bandwidth, which is one of the mobile WiMAX profiles, and the size of each time domain is an example.

Referring to FIG. 5C, the DL fixed region 518 of the DL subframe consists of nine symbols, the fixed region 522 of the UL subframe consists of six symbols, and the remaining time regions 520 It consists of nine symbols.

 Hereinafter, a frame configuration according to various DL to UL ratios according to a second embodiment of the present invention. Here, the size of each region follows the structure shown in FIG. 5A.

6A is a diagram illustrating a frame configuration in which a DL-to-UL ratio is 1: 1 mode according to a second embodiment of the present invention.

Referring to FIG. 6A, a frame is a 1: 1 mode in which DL is allocated to three time domains PHY 0, PHY 2, and PHY 4, and UL is allocated to the remaining three time domains PHY 1, PHY 3, and PHY 5. . The frame is. A fixed region 600 of the DL and a fixed region 602 of the UL.

6B is a diagram illustrating a frame configuration in which a DL-to-UL ratio is 2: 1 mode according to a second embodiment of the present invention.

Referring to FIG. 6B, DL is allocated to four time domains PHY 0, PHY 1, PHY 3, and PHY 4, and UL is allocated to the remaining two time domains PHY 2 and PHY 5 in a 2: 1 mode.

As described above, the 1: 1 and 2: 1 modes of FIGS. 6A and 6B are DL / UL ratios of the time domain within one frame. In this case, the frame structure can be extended to a super frame by grouping several frames according to the DL / UL ratio and the number of symbols in the time domain frame.

6C is a diagram illustrating an example of a frame configuration in which a DL-to-UL ratio is 3: 2 mode according to a second embodiment of the present invention.

Referring to FIG. 6C, the time domains of the 3: 2 mode are configured in the form of a super frame spanning a total of five frames using four additional frames including one frame shown. That is, in one frame, DL is allocated to three time domains PHY 0, PHY 1, and PHY 2, and UL is allocated to the other two time domains PHY 3 and PHY 4, and is in a 3: 2 mode. The remaining time domain other than the five time domains in the frame, PHY 5, is included in one of the time domains that allocates the DL of the next frame. The time domains then consist of five superframes to support the 3: 2 ratio.

As illustrated in FIG. 6C, the number of superlink regions and the super frame structure in each subframe in the advanced system vary according to the UL / DL ratio. In the advanced system, a fixed control slot is provided as in the existing system and used for compatibility with the existing service.

In the present invention, by configuring a time domain for transmitting the direction and the reverse link of the link to the existing link, a time-gap for switching according to the change in the link direction of the time domain is required. The time interval for the switching can be obtained by changing the CP (Cyclic Prefix) length of the OFDMA symbol in the section excluding the fixed region of the frame. In addition, instead of changing the CP length of the OFDMA symbol in consideration of cell coverage, a time interval equal to a decimal multiple or an integer multiple of the OFDMA symbol interval may be considered.

Hereinafter, the gain in terms of latency obtained in the present invention will be described based on HARQ operation, which is one of closed loop control schemes. Here, in the existing system, one frame length is 5ms, the DL region is composed of 27 symbols, the UL region is composed of 15 symbols, the one symbol length is IEEE 802.16 having 1/8 CP e A case of using a symbol length in 1k Fast Fourier Transform (FFT) mode will be described as an example.

7 is a flowchart illustrating HARQ operation of DL data transmission in a frame structure according to a second embodiment of the present invention. The frame structure follows the TDD scheme in a 2: 1 mode.

Referring to FIG. 7, the first data transmission is performed in the DL1 time domain of the (i-1) th frame 700. Then, the latency 1 706 until the next data transmission or retransmission is performed, that is, the (re) transmission of data from the DL1 time domain as the transmission time point is performed in the DL2 time domain of the (i) th frame 702. Is 6.4 ms, and the latency 2 from the next frame of the (i + 1) th frame 704 at which the data (re) transmission is performed from the DL2 time domain to the next (i + 1) th frame 704 is performed. ) Is 8.6 ms. Accordingly, the average value of the two latency 1,2 is about 7.5ms, which satisfies the latency of about 1/2 as compared to the conventional method, thereby enabling rapid data transmission.

8 is a flowchart illustrating HARQ operation of UL data transmission in a frame structure according to a second embodiment of the present invention. Referring to FIG. 8, when the first data transmission is performed in the UL0 time domain of the (i-1) th frame 800, data is reconstructed from the transmission time UL0 time domain until the next data transmission is performed. The latency 1 808 until the transmission is performed in the UL1 time domain of the (i) th frame 802 is 7.4 ms, and the UL1 time domain of the (i) th frame 802 at the time of data (re) transmission. The latency 2 810 between UL0 time domains of the (i + 2) th frame 806 at which the next data (re) transmission is performed is 7.4 ms. Therefore, since the average value between the latency 1 and the latency 2 has a value of 7.4 ms, it has a latency of about 1/2 as compared to the conventional method, thereby enabling fast data transmission.

As described above, it can be seen from the HARQ operation flowchart according to the present invention that the frame structure of the present invention can reduce the latency to half the level of the existing frame.

Hereinafter, the present invention may consider coexistence as well as compatibility with an existing system as follows. Herein, a terminal capable of supporting an existing communication system providing an existing service is called an 'legacy terminal' and a terminal capable of supporting an advanced service is called an 'evolution terminal'. Here, although the existing service has been described as an example of IEEE 802.16e or mobile WiMAX, it is of course applicable to a system capable of supporting other broadband services.

9 is a diagram illustrating an example of a coexistence method between an existing terminal and an advanced terminal in a frame structure according to a second embodiment of the present invention.

Referring to FIG. 9, when the DL / UL mode is 2: 1, the advanced terminal may include a fixed region, one DL time region DL0, and one UL time region UL0 in the DL subframe region 900. Has a fixed region and one DL time region DL3 in the UL subframe region 902. The fixed region may be used for an advanced terminal as well as an existing terminal.

Next, the existing terminal has two DL time domains DL0 and DL2 in the DL subframe region 900 and one UL time region UL1 in the UL subframe region 902. Here, since the time domains are units for distinguishing each region, two adjacent time domains may be actually configured as one region. In addition, the time domain not only coexists in the form of time division multiplexing (TDM), but the other time domains except for the direction of the corresponding subframe and the time domain to which the reverse link is allocated, may use an OFDMA burst using the same subchannel scheme. By assigning, existing services and advanced services can coexist in the form of frequency division multiplexing (FDM).

Hereinafter, according to the third embodiment of the present invention, at least one UL time domain is located in the DL subframe region, and at least one DL time domain is present in the DL subframe region. In this case, when both the advanced service and the existing service are supported, reverse link interference occurs between the UL time domain and the DL time domain. In this case, communication is scheduled in a limited manner so that reverse link interference occurring in the time domains in which the reverse link interference occurs is minimized. That is, each base station makes limited use of an area in which reverse link interference exists through communication between an existing service and a base station that provides an advanced service, or a terminal that does not have a large influence of the interference in a time domain in which reverse interference of the advanced system occurs. Can be scheduled around.

10A and 10B are diagrams illustrating a time domain in which a reverse link interference occurs between a cell providing an existing service and a cell providing an advanced service according to a third embodiment of the present invention in terms of a frame structure; to be.

Referring to FIG. 10A, in the case of the advanced terminal, the advanced terminal and the existing terminal in the UL time region UL0 located in the DL subframe region 1000 and the DL time region DL3 located in the UL subframe region 1002. Reverse link interference occurs between.

Referring to FIG. 10B, after information on the areas 1004 and 1006 corresponding to the areas UL0 and DL3 where the reverse link interference exists in the existing terminal is designated as a limited area, the limited area is not affected by the interference. The scheduling is mainly for communication with the terminal.

11 is a table showing parameters for designating information of a plurality of areas according to an exemplary embodiment of the present invention.

Referring to FIG. 11, in IEEE 802.16e, 'STC_DL_Zone_Switch_IE ()', 'AAS_DL_Zone_IE ()', which are region indicators for providing region configuration information for a plurality of time domains constituting a DL subframe, and a UL subframe 'UL_Zone_Switch_IE ()' and 'AAS_UL_IE ()', which are area indicators for providing zone configuration information for a plurality of time domains, are defined. That is, the area indicators use a 1-bit reserved bit in the existing information element to determine whether the area is an advanced service and direction information on the link. Specify.

Thereafter, the advanced terminal receiving the area indicator recognizes whether the corresponding area is the advanced area or the existing area through the information specified in the information element. On the other hand, when the region indicator designates an advanced region, the existing terminal cannot recognize the designated bit, and thus recognizes the region as a don't care, and the burst of the terminal within the region If not allocated, the area is ignored.

 12 is a block diagram illustrating a transmitter according to an embodiment of the present invention. Here, the transmitting apparatus of the base station transmitting the DL subframe will be described as an example, but the same description will be applied to the transmitting apparatus of the terminal transmitting the UL subframe.

Referring to FIG. 12, the transmitting apparatus includes a frame configurator 1202, a resource mapper 1204, an IFFT unit 1206, a cyclic prefix inserter 1210, and the like. And a digital to analog converter (DAC) 1212, a transmission switch 1214, and a transmission control unit 1216. The remaining components other than the frame configurator 1202, which is the operation subject of the present invention, are not highly related to the present invention, and thus detailed operation description thereof will be omitted.

The frame configurator 1202 generates information to be transmitted through encoding or the like under the control of the transmission control unit 1216, and the generated information is one or more of the plurality of subchannels by the resource mapper 1204. Mapped to more subchannels. Here, subcarriers included in each subchannel are allocated according to a block scheme, an interleaved scheme, a block-interleaved scheme, and the like. In detail, the frame configurator 1202 generates a fixed region for compatibility with an existing service in a frame divided into a DL subframe region and a UL subframe region, and includes a plurality of remaining regions of the frame except for the fixed region. Set time zones of.

Thereafter, the frame configurator 1202 sets the fixed region only within the DL subframe according to the first embodiment of the present invention, or sets the fixed region according to the second embodiment of the present invention to the DL subframe and the UL unit. Create in each frame. In addition, according to the third embodiment of the present invention, the frame configurator 1202 configures at least one or more time domains among the plurality of time domains as reverse link regions in the link direction of the corresponding subframe.

13 is a flowchart illustrating an operation of a frame configurator according to an exemplary embodiment of the present invention.

Referring to FIG. 13, in step 1300, the frame configurator generates a fixed area within a preset area, and proceeds to step 1305. In this case, the fixed area includes an area for transmitting burst allocation and control information for compatibility with an existing system.

In operation 1305, the frame configurator generates at least one time domain in the remaining regions other than the fixed region, and then proceeds to operation 1310. In step 1310, the frame configurator configures a frame including the fixed area and the time area.

1A illustrates a frame structure of a typical Institute of Electrical and Electronics Engineers (IEEE) 802.16e communication system.

FIG. 1B illustrates a frame structure composed of a plurality of areas in a general IEEE 802.16e communication system.

2A is a data flow diagram of a Hybrid Automatic Repeat reQuest (HARQ) operation for DL transmission in a typical IEEE 802.16e communication system.

2B is a data flow diagram of a Hybrid Automatic Repeat reQuest (HARQ) operation for UL transmission in a typical IEEE 802.16e communication system.

3 is a view showing a frame configuration method according to a first embodiment of the present invention.

4 is a view showing a frame configuration method according to a second embodiment of the present invention.

5A illustrates an example of an advanced frame structure in which a DL subframe and a UL subframe have the same fixed region size according to the second embodiment of the present invention.

5B illustrates an example of an advanced frame structure in which DL subframes and UL subframes have different fixed region sizes according to the second embodiment of the present invention.

FIG. 5C is a diagram illustrating another example of an advanced frame structure in which DL subframes and UL subframes have different fixed region sizes according to the second embodiment of the present invention. FIG.

6A illustrates a frame configuration in which a DL-to-UL ratio is 1: 1 mode according to a second embodiment of the present invention.

6B illustrates a frame configuration in which a DL-to-UL ratio is 2: 1 mode according to a second embodiment of the present invention.

FIG. 6C illustrates a frame configuration in which a DL-to-UL ratio is 3: 2 mode according to a second embodiment of the present invention. FIG.

7 is a flowchart illustrating HARQ operation of DL transmission in a frame structure according to the second embodiment of the present invention.

8 is a flowchart illustrating HARQ operation of UL transmission in a frame structure according to the second embodiment of the present invention.

9 is a diagram illustrating an example of a coexistence method between an existing terminal and an advanced terminal in a frame structure according to a second embodiment of the present invention.

10A illustrates reverse link interference occurring between a cell providing an existing service and a cell providing an advanced service according to a third embodiment of the present invention.

FIG. 10B illustrates a method of establishing a restricted area for canceling reverse link interference according to a third embodiment of the present invention. FIG.

11 is a table showing parameters for specifying information of a plurality of areas according to a preferred embodiment of the present invention.

12 is a block diagram showing a transmission apparatus according to a preferred embodiment of the present invention.

13 is a flowchart illustrating operation of a frame configurator according to an exemplary embodiment of the present invention.

Claims (24)

A method of configuring a frame including a first subframe and a second subframe in a communication system, Generating a first region supporting compatibility with other communication systems in the first subframe; Creating a second region of the first subframe that is a reverse link of at least one of the first subframes in a region other than the first region in the first subframe; Generating a third region that is a reverse link of the second subframe in the second subframe; And forming a frame including the first region, the second region, and the third region. The method of claim 1, And the first subframe and the second subframe are downlink regions and uplink regions of the communication system and other communication systems, respectively. The method of claim 2, wherein the generating of the second region comprises: Generating a predetermined size of an uplink time region and a downlink time region according to a remaining downlink region of the first subframe except the first region and a downlink and uplink ratio predetermined in the second subframe region; Frame composition method comprising a. The method of claim 2, wherein the second region, The frame configuration method, characterized in that the downlink time domain. 3. The method of claim 2, further comprising: generating a superframe structure in which a predetermined size of an uplink time region and a downlink time region are generated over a plurality of frames according to the predetermined downlink and uplink ratio. How frames are organized. The method of claim 2, wherein the generating of the third region comprises: Generating a fourth region supporting compatibility with other communication systems in the second subframe; In the remaining region of the second subframe except the fourth region and the remaining region of the first subframe except the first region, an uplink time region having a predetermined size according to a predetermined downlink and uplink ratio; The frame composition method further comprising the step of generating a downlink time domain. The method of claim 6, And the second region is the uplink time region. The method of claim 6, further comprising: generating a superframe structure in which a predetermined size of an uplink time region and a downlink time region are generated over a plurality of frames according to the predetermined downlink and uplink ratio. How frames are organized. The method of claim 5, And the first region and the fourth region comprise a preamble composed of one symbol and a partial usage of sub channel (PUSC) region for transmitting burst allocation and control information. The method of claim 9, wherein the PUSC region, And an indicator indicating whether the communication system supported by the frame is the communication system or another communication system. The method of claim 10, wherein when the indicator indicates that the frame supports other communication, the indicator is information recognized by a first terminal supporting both the communication system and the other communication system. The time domain of the second frame supporting only the communication system corresponding to the second area and the third area of the first frame supporting both the communication system and another communication system is set as a restricted area. and, The method of claim 1, wherein the scheduling is performed in the order of terminals in which the backward interference is minimized among the second terminals supporting only the communication system in the restricted area. An apparatus for configuring a frame including a first subframe and a second subframe in a communication system, In the first subframe, a first region for supporting compatibility with another communication system is generated, and the first subframe is a reverse link of at least one of the first subframes in the remaining region except for the first region. Create a second region, generate a third region that is a reverse link of the second subframe from the second subframe, and configure a frame including the first region, the second region, and the third region Frame composition device comprising a frame generator. The method of claim 13, And the first subframe and the second subframe are downlink regions and uplink regions of the communication system and other communication systems, respectively. The method of claim 14, wherein the frame generator, Generating an uplink time domain and a downlink time domain of a predetermined size according to the remaining region of the first subframe except the first region and the downlink and uplink ratios predetermined in the second subframe region. A frame structuring device, characterized in that The method of claim 13, And the second region is the downlink time region. The method of claim 13, wherein the frame generator, And generating a superframe having a predetermined size of an uplink time domain and a downlink time domain over a plurality of frames according to the predetermined downlink and uplink ratio. The method of claim 13, wherein the frame generator, Generate a fourth region supporting compatibility with other communication systems in the second subframe; In the remaining region of the second subframe except the fourth region and the remaining region of the first subframe except the first region, an uplink time region having a predetermined size according to a predetermined downlink and uplink ratio; Frame construction apparatus characterized by generating a downlink time domain. The method of claim 17, And the second region is the uplink time region. The method of claim 17, wherein the frame generator, And a superframe structure in which a predetermined size of an uplink time domain and a downlink time domain is generated over a plurality of frames according to the predetermined downlink and uplink ratio. The method of claim 17, And the first region and the fourth region comprise a preamble composed of one symbol, and a partial usage of sub channel (PUSC) region for transmitting burst allocation and control information. The method of claim 20, wherein the PUSC region, And an indicator indicating whether the communication system supported by the frame is the communication system or another communication system. The method of claim 22, And when the indicator indicates that the frame supports other communication, the indicator is information recognized by a first terminal supporting both the communication system and the other communication system. The method of claim 22, A time zone of a second frame supporting only the communication system corresponding to the second region and the third region of the first frame supporting both the communication system and another communication system is set as a restricted region, And scheduling in the order of terminals in which backward interference is minimized among second terminals that support only the communication system in the restricted area.

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