KR20080102934A - System and method for transmitting/receiving signal in a communication system - Google Patents

Abstract

A signal transceiving system and a method thereof in a communication system which effectively operates various system operation modes are provided to improve the BCH detection, support a sharing mode effectively and to operate a communication system sharing a first communication system and a second communication system. A second communication system uses control signal and broadcasting signal used in a first communication system. A first message including common control information of the first communications system and frame control information are transmitted. A second message including the common control information and frame control information of the second communications system is transmitted. The location information of the second message is signaled and transmitted in the second frame.

Description

System and method for transmitting and receiving signals in communication system {SYSTEM AND METHOD FOR TRANSMITTING / RECEIVING SIGNAL IN A COMMUNICATION SYSTEM}

The present invention relates to a communication system, and more particularly to a system and method for transmitting and receiving signals in a broadband wireless access communication system.

Communication systems are evolving to provide various services such as broadcasting, multimedia video, and multimedia messages. In particular, active research is being conducted to provide users with services having high quality of service (QoS: Quality of Service (QoS)) in a next generation communication system. In addition, next-generation communication systems are being developed to provide data transmission speeds of 100 Mbps or more for high-speed mobile users and 1 Gbps or more data services for low-speed mobile users, mainly for voice and packet data communication.

A close proximity to this next generation communication system is a portable Internet system. The portable Internet system is also called a mobile WiMAX or 'WiBro' (Wireless Broadband) communication system and is compatible with a communication system based on Institute of Electrical and Electronics Engineers (IEEE) 802.16.

The mobile WiMAX communication system is in the commercialization stage, and a mobile WiMAX evolution communication system that has developed the mobile WiMAX communication system is currently being studied. The mobile WiMAX evolution evolution communication system aims at performances such as mobility support up to 300km per hour, variable bandwidth support, and overhead minimization.

The mobile WiMAX evolutionary communication system seeks to introduce advanced technologies that were not used in the mobile WiMAX communication system. The advanced technologies include a multi-antenna technology and a multicast / broadcast service technology.

Meanwhile, assuming that the mobile WiMAX communication system and the mobile WiMAX evolution communication system are implemented, the mobile WiMAX communication system and the mobile WiMAX evolution communication system must coexist with each other. Accordingly, the mobile WiMAX communication system and the mobile WiMAX evolution communication system coexist and efficiently support the mobile WiMAX evolution communication operation simultaneously, such as broadcast information transmission and transmission frame structure in the evolution system There is a specific need for a signal transmission / reception scheme for providing indication information.

Accordingly, the present invention proposes a resource allocation system and method in a communication system.

The present invention also proposes a signal transmission and reception system and method in a communication system.

In addition, the present invention proposes a signal transmission and reception system and method for providing indication information on a broadcast information transmission structure and frame control information in a broadband wireless access communication system.

The present invention provides a signal transmission method in a communication system, wherein a first communication system and a second communication system exist, and the second communication system is a system evolved from the first communication system and used in the first communication system. A control signal and a broadcast signal may be used, and a first message including common control information and frame control information of the first communication system is transmitted in a first frame, and common control information of the second communication system in a second frame. And a second message including frame control information, and signaling and transmitting position information of the second message in the second frame.

The present invention also provides a signal receiving method in a communication system, wherein a first communication system and a second communication system exist, and the second communication system is a system evolved from the first communication system in the first communication system. A control signal and a broadcast signal can be used, and a first message including common control information and frame control information of the first communication system is received in a first frame, and a common message of the second communication system is received in a second frame. A second message including control information and frame control information is received, and position information of the second message is obtained in the second frame.

The present invention provides a signal transmission system in a communication system, wherein a first communication system and a second communication system exist, and the second communication system is a system evolved from the first communication system in the first communication system. A control signal and a broadcast signal can be used, and a first message including common control information and frame control information of the first communication system is transmitted in a first frame, and a common message of the second communication system is transmitted in a second frame. And a base station transmitting a second message including control information and frame control information, and signaling and transmitting location information of the second message in the second frame.

In addition, the present invention, in the signal receiving system in the communication system, there is a first communication system and a second communication system, the second communication system is a system evolved from the first communication system in the first communication system A control signal and a broadcast signal can be used, and a first message including resource allocation information of the first communication system is received in a first frame, and resource allocation information of the second communication system is included in a second frame. And a terminal for receiving a second message, and obtaining location information of the second message in the second frame.

The present invention relates to a signal reception method of a mobile station in a communication system, comprising: a third communication system in which a first communication system and a second communication system evolved in the first communication system coexist, and the second communication system exist alone. Determining whether to receive a reference signal for the fourth communication system in a situation in which the fourth communication system is mixed, and when not receiving the reference signal for the fourth communication system, Receiving synchronization with a reference signal, determining whether to receive common control information for the second communication system, and receiving common control information for the second communication system for the second communication system. Decoding the common control information.

As described above, the present invention provides a frame structure in a communication system in which a first communication system and a second communication system coexist, and provides indication information of a frame configured in the second communication system through L1 signaling. The communication system in which the second communication system coexists can be effectively operated, and in particular, the BCH detection can be improved to support the coexistence mode more efficiently. In addition, in the case of the third communication system in which the first communication system and the second communication system do not coexist and the second communication system exists alone, an SCH for the third communication system is provided to effectively perform various system operation modes. Can operate.

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

In an embodiment of the present invention described below, a first communication system, for example, Institute of Electrical and Electronics Engineers (IEEE) 802.16 in a communication system, such as a broadband wireless access (BWA) communication system, may be used. Proposes a frame structure in the case where a communication system (hereinafter referred to as an 'IEEE 802.16 communication system') and a second communication system which improves the performance of the first communication system coexist. The present invention proposes a signal transmission and reception system and method for providing indication information. In addition, another embodiment of the present invention proposes a signal transmission / reception system and method in which there is only a third communication system in which the second communication system does not coexist with the first communication system, that is, the second communication system. For example, the wired / wireless network may be operated using only the second communication system that can coexist while the first communication system and the second communication system coexist.

Herein, in the embodiment of the present invention to be described below, an IEEE 802.16 communication system is used as the first communication system, and a communication system for improving the performance of the IEEE 802.16 communication system is used as the second communication system (hereinafter, referred to as an 'advanced communication system'). Although a description will be given by way of example, the frame structure and signal transmission / reception system and method proposed by the present invention may be referred to as other communication systems such as code division multiple access (CDMA). ), Wideband Code Division Multiple Access (WCDMA), and Global System for Mobile Telecommunication (GSM). It can also be applied to a series of communication systems.

In addition, in an embodiment of the present invention to be described later, the first communication system and the second communication system are Time Division Multiplexing (TDM) or Frequency Division Multiplexing (FDM) in the same frame. Division Multiplexing, hereinafter referred to as 'FDM') will be described as an example. In addition, in the embodiment of the present invention to be described below, a mobile WIMAX communication system as a first communication system and a mobile WiMAX evolution communication system as a second communication system will be described as an example.

In the communication system according to the exemplary embodiment of the present invention, when the first communication system and the second communication system coexist, resources for the first communication system and the second communication system are allocated and the resources are allocated. Correspondingly, frame control information is configured, and the configured frame control information is indicated through specific signaling. In this case, the communication system according to an embodiment of the present invention proposes a broadcast channel (BCH: Broadcast CHannel, hereinafter referred to as 'BCH') as a common control channel through which control information for the second communication system is transmitted. Notifies the mobile terminal of the location information of the BCH region. In the specific signaling scheme, L1 signaling corresponding to signal characteristics and patterns in the frequency domain and the time domain is determined, and location information and decoding information of the BCH region are obtained through the determined L1 signaling. Next, a frame structure in a communication system according to an embodiment of the present invention will be described with reference to FIG. 1.

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

Referring to FIG. 1, the frame 100 is referred to as a downlink (DL: DownLink, hereinafter referred to as 'DL') according to a transmission transition interval (TTG). A subframe (DL subframe) 110 and an uplink (UL: Uplink, referred to as "UL") subframe (UL subframe) 150, and can be divided into a receive transition interval (RTG: Receive Transition Gap, It will be referred to as 'RTG' below) to be distinguished from the next frame.

The DL subframe 110 includes a preamble region 112, a frame control header (FCH) region 114, and a DL map (MAP) ( The area 116, hereinafter referred to as 'DL-MAP', the UL map (hereinafter, referred to as 'UL-MAP'), and the data burst area for data transmission and reception of the first communication system. An area (hereinafter referred to as 'first communication system area') 120 and an area (hereinafter referred to as 'second communication system area') 122 for data transmission and reception of the second communication system, The UL subframe 150 includes a first communication system region 152 and a second communication system region 154 as a data burst region.

The preamble area 112 is a synchronization acquisition of the first communication system and the second communication system, that is, between the transceivers in the first communication system and the second communication system, for example, referred to as a base station (BS). And an area in which a preamble signal used for cell search is transmitted, which is common between the first communication system and the second communication system. This is an area where a preamble signal that can be used is transmitted. Frame control information of the first communication system is transmitted through the FCH region 114, and the FCH is a modulation and coding scheme applied to the MAP region, that is, the DL-MAP region 116 and the UL-MAP region 118; Information on the length of the DL-MAP region 116 and the UL-MAP region 118 is included. The DL-MAP area 116 transmits a DL-MAP message, and the UL-MAP area 118 is an area in which a UL-MAP message is transmitted. The DL-MAP message and the UL-MAP message include location information on the DL burst area and the UL burst area, modulation and coding scheme information, and the like.

As such, the frame 100 is a frame in which the first communication system and the second communication system coexist. In this case, the FCH region 114 and the DL / UL-MAP region 116 and 118 are quadrature phase shifts, respectively. Keying) 1/12, 1/16 level is applied.

Meanwhile, as described above, in the frame structure in which the first communication system and the second communication system coexist, the first communication system and the second communication system should be operated independently. That is, the second communication system must be able to provide improved performance unlike the first communication system. To this end, the present invention will be described with reference to FIGS. 2A and 2B to describe a frame structure in which a region in which a BCH including common control information and broadcast information is provided in a communication system according to an embodiment of the present invention is added.

2A and 2B schematically illustrate a frame structure in a communication system according to an embodiment of the present invention. 2A and 2B are diagrams illustrating that the first communication system region and the second communication system region are TDM in the same frame, and FIGS. 2A and 2B are different in positions where the BCH information is transmitted. It is a figure which shows.

2A and 2B, the frame may be divided into DL subframes 210 and 250 and UL subframes 230 and 280. The DL subframes 210 and 250 may include preamble regions 212 and 252, FCH regions 214 and 254, DL-MAP regions 216 and 256, UL-MAP regions 218 and 258, and first communication system regions 220, 260 and 266. Two communication system regions 222, 262, and 266, and BCH regions 224 and 264. The UL subframes 230 and 280 may include a first communication system region 232 and 282 and a second communication system region 234 and 284 as data burst regions. Here, as shown in FIG. 2B, the second first communication system area 266 may also be allocated to the second communication system area in the DL subframe.

As described above, the preamble areas 212 and 252 are areas in which a preamble signal used for acquisition of a synchronization and a cell search is transmitted in a first communication system and a second communication system, and the first communication system and the second communication system are transmitted. This area is a preamble signal that can be commonly used in a communication system. An FCH is transmitted through the FCH regions 214 and 254, and the FCH is a modulation and coding scheme applied to the MAP region, that is, the DL-MAP region 216 and 256 and the UL-MAP region 218 and 258, and the DL-MAP region 216 and 256. ) And the length of the UL-MAP regions 218 and 258. In the DL-MAP areas 216 and 256, DL-MAP messages are transmitted, and the UL-MAP areas 218 and 258 are areas in which a UL-MAP message is transmitted. The DL-MAP message and the UL-MAP message include location information on the DL burst area and the UL burst area, modulation and coding scheme information, and the like.

Meanwhile, the mobile terminal of the second communication system acquires synchronization using the preamble signals transmitted through the preamble areas 212 and 252, and common control to obtain frame control information of the second communication system in accordance with the synchronization acquisition. Search for a channel. The frame control information is included in the region allocated to the second communication system in the DL subframes 210 and 250, the region allocated to the second communication system in the UL subframes 230 and 280, and the BCH regions 224 and 264. That is, the mobile terminal of the second communication system does not decode the FCHs 214 and 254 and the MAP information 216, 218, 256 and 258 of the first communication system and synchronizes using the preamble signal of the first communication system. After acquiring, search for the BCH region of the second communication system.

The BCH regions 224 and 264 include frame configuration information, system and cell information of the second communication system. Accordingly, after confirming the location and decoding information of the BCH regions 224 and 264, the mobile terminal of the second communication system decodes the signal provided in the BCH regions 224 and 264, and then, DL as the frame configuration information of the second communication system. Obtain second communication system regions 222, 262, 266 in subframes 210, 250 and second communication system regions 234, 284 in UL subframes 230, 280.

In this case, the BCH regions 224 and 264 may be located at predetermined positions in the DL subframes 210 and 250 of the frame corresponding to the ratio and coexistence ratio of the DL region and the UL region. That is, located behind the data burst region 222 of the second communication system of the DL subframe 210 as shown in FIG. 2A, or located at an arbitrary time interval of the DL subframe 250 as shown in FIG. 2B. can do.

Hereinafter, for convenience of description, the following description will be made with reference to the case of FIG. 2A. As described below, the BCH region 264 includes the second communication system region 262 and the first communication system region 266 as illustrated in FIG. 2B. The same applies to the case where it is located in the time interval between or in another predetermined area.

In addition, the BCH regions 224 and 264 may be included in every frame or a certain periodic frame. Meanwhile, the DL region of the second communication system in the coexistence frame is obtained through the BCH regions 224 and 264. In addition, the common control information included in the BCH regions 224 and 264 may be transmitted by applying a lower coding rate than the common control information of the first communication system.

3A and 3B illustrate DL subframes in a communication system according to an embodiment of the present invention. 3A and 3B are diagrams for explaining location information acquisition of a BCH region through L1 signaling in a communication system according to an embodiment of the present invention.

Referring to FIG. 3A, the DL subframe includes a preamble region 302, an FCH region 304, a DL-MAP region 306, an UL-MAP region 308, and a first communication system region ( 310, a second communication system region 312, and a BCH region 314. The BCH region 314 includes a plurality of reference signal (RS) regions 31-1 to 316-4.

As described above, the RS regions 316-1 to 316-4 of the BCH region 314 can detect the position of the BCH region 314 through L1 signaling corresponding to a signal characteristic and a pattern in the frequency domain. ) Includes a reference signal (RS). Here, the reference signal is defined as a form and a signal different from a reference signal, for example, a pilot signal in a channel other than the BCH, so that the MS recognizes that the region including the reference signal is the BCH region 314. Here, the physical channel occupied by the BCH may occupy a two-dimensional region formed by a time domain and a frequency domain as well as an OFDMA symbol unit.

That is, the MS of the second communication system acquires synchronization by using the preamble signal transmitted through the preamble area 302, and then the received signal is called a Fast Fourier Transform (FFT). L1 signaling, that is, a specific reference signal pattern, is detected to recognize that the corresponding time period corresponds to the time period corresponding to the BCH region 314. The specific reference signal pattern is already recognized by the MS by an advance appointment. Thus, the MS detects L1 signaling through correlation of the received signal with a known signal sequence.

Referring to FIG. 3B, the DL subframe includes a preamble region 352, an FCH region 354, a DL-MAP region 356, an UL-MAP region 358, and a first communication system region ( 360, a second communication system region 362, and a BCH region 364.

In FIG. 3B, the MS of the second communication system recognizes the BCH region 364 through the BCH preamble region 366 corresponding to a prior signal or a posterior signal pattern. In this case, the BCH preamble region 366 is positioned in a time section before the BCH region 364 so as to obtain position information of the BCH region 364 through a pre-signal pattern, or in a time region after the BCH region 364 and a post signal. Through the pattern, location information of the BCH region 364 may be obtained. In addition, the BCH region is provided at a predetermined interval from the pre-signal or the post-signal, and the physical channel occupied by the BCH occupies a two-dimensional region formed by a time domain and a frequency domain as well as an OFDMA symbol unit, or a predetermined time domain. Can occupy some or all of the frequency domain.

That is, the MS of the second communication system acquires synchronization using a preamble signal transmitted through the preamble region 352, and then FFTs the received signal to indicate the BCH region 366 transmitted to the BCH through L1 signaling. The pre-signal or post-signal pattern is detected to obtain location information of the BCH region 364. In this case, a correlation between a sequence already recognized by the MS, that is, a predefined sequence between the BS and the MS of the second communication system and a signal transmitted through the BCH is measured, and the measured correlation is greater than or equal to a threshold value. The signal pattern of the BCH region 364 is detected to obtain the position of the BCH region 364.

The specific signaling method corresponding to the signal characteristic and pattern in the time domain includes a method of defining and using an OFDMA signal characteristic and pattern that can be obtained through a subcarrier set of a predetermined rule on the physical channel through which the BCH is transmitted; The physical channel to which the BCH is transmitted may be classified into a method of defining and using an OFDMA signal characteristic, that is, a repetition pattern of a signal obtained by mapping resources with a predetermined rule. For example, a signal transmitted over a set of subcarriers at regular intervals in the frequency domain of an OFDMA communication system has a time domain pattern repeated by the constant interval and corresponds to the autocorrelation of the repeating pattern by defining the repeated time domain pattern. By detecting specific signaling to obtain the location of the BCH region. Herein, the method of defining and using the repetition pattern will be described in more detail. When a predetermined interval is M in the frequency domain, M repetition patterns of L sections exist through M subcarrier sets, and an FFT size is obtained. Alternatively, the total number of subcarriers N is L × M. Accordingly, a signal transmitted on a subcarrier set of M subcarrier intervals may be represented by Equation 1 below.

In Equation 1, n and l denote subcarrier indexes, and m denotes a repeating pattern index. A signal such as Equation 1 is represented by Equation 2 below in the time domain.

이다. 도 4 a에서는 M=4 인 경우, 반복 패턴 인덱스 m에 따른 상기 수학식의 신호 패턴을 도시하고 있다. 참조번호 410은 m=0 인 경우를 도시하고 있으며, 참조번호 420은 m = 1 인 경우를 도시하고 있으며, 참조번호 430은 m = 2 인 경우를 도시하고 있으며, 참조번호 430은 m =3 인 경우를 도시하고 있다. 그에 따라, 상기 제2 통신 시스템의 MS는 동기화를 수행한 후, 시간 영역에서 수신 신호의 자기 상관도에 상응한 반복 특성을 검출하고, 상기 검출한 반복 특성이 상기 제2 통신 시스템의 BS와 MS 간에 미리 정의된 반복 특성을 만족할 경우 해당 위치로부터 BCH 영역의 위치 정보를 획득한다. In Equations 1 and 2, l = 0, ..., N / M-1, p = 0, ... M-1,

to be. In FIG. 4A, when M = 4, the signal pattern of the above equation according to the repeating pattern index m is illustrated. Reference numeral 410 shows a case where m = 0, reference number 420 shows a case where m = 1, reference number 430 shows a case where m = 2 and reference number 430 shows m = 3. The case is illustrated. Accordingly, after performing synchronization, the MS of the second communication system detects a repetition characteristic corresponding to the autocorrelation of the received signal in the time domain, and the detected repetition characteristic is determined by the BS and the MS of the second communication system. If the predefined repetition characteristic is satisfied, the BCH region location information is acquired from the corresponding location.

4A and 4B illustrate symbols of a BCH region in a DL subframe in a communication system according to another embodiment of the present invention.

Referring to FIG. 4A, an L1 signaling scheme corresponding to a signal characteristic and a pattern in the time domain defines patterns of an arbitrary subcarrier set and corresponds to a correlation of a sequence transmitted in the plurality of defined patterns. The location of the BCH and the transmission mode of the BCH are jointly obtained. For example, the BCH transmission mode is four cases as follows, wherein each BCH transmission mode assumes QPSK, coding rate = 1/2, and a convolutional code (CC). Here, the BCH transmission mode includes a transmit diversity scheme, a modulation and coding scheme (hereinafter referred to as MCS), a repetition number, a channel coding scheme, period and interval information, and the like.

Single transmit antenna, period: 2 slots, span: 24 slots, number of repetitions: 12

2. Single transmitting antenna, period: 2 slots, range: 48 slots, number of repetitions: 24

3. Multiple Input Multiple Output (MIMO) Transmitted Antenna Diversity, e.g. Space-Frequency Block-Coded (SFBC) Method, period: 2 slots, interval: 24 slots, number of repetitions: 12

4. Diversity MIMO transmit antenna, period: 2 slots, interval: 48, number of repetitions: 24

Then, the patterns of the different subcarrier sets may be used by configuring four different subcarrier set patterns as an example, and the pattern 1 410 uses the set of 4k subcarriers as the signal pattern, and the pattern 2 420 uses a set of 4k + 1 subcarriers as a signal pattern, pattern 3 430 uses a set of 4k + 2 subcarriers as a signal pattern, and pattern 4 440 uses a 4k + 3 subcarrier. Use a set of carriers as a signal pattern. Where k is 0, ..., N / 4, and N is the FFT size.

In addition, a plurality of sequences may be defined and used in the same pattern by the set of subcarriers as described above. In this case, a correlation between a signal received through the same pilot pattern and a plurality of defined sequences is measured to correspond to a transmission mode. Acquire a BCH transmission mode through. That is, in order to support more various transmission modes, a part of transmission modes is specified by a pattern by a subcarrier set, and the other part of the transmission modes is specified by a plurality of sequences in each pattern, and thus a hierarchical transmission mode Information can be obtained. Accordingly, various sequences transmitted in the same pattern as well as various repeating patterns may be defined. In addition, the MS of the second communication system measures the received power of each subcarrier set in the frequency domain by FFT the received signal as well as the correlation characteristics in the time domain, and detects the subcarrier set having the largest received power to the BCH. Obtain location information of the area. Then, the BCH transmission mode is detected by measuring a correlation with a sequence according to a transmission mode in which the sequence transmitted from the detected subcarrier set is known in advance.

Referring to FIG. 4B, the L1 signaling scheme corresponding to the signal characteristics and patterns in the time domain uses a constant repetitive sequence during BCH transmission, and a cyclic delay in the time domain for a BCH signal having such repetition characteristics. Alternatively, the signal is transmitted by performing a cyclic shift to acquire location information of the BCH region. In this case, when the BCH signal having a constant repetition characteristic is cyclically delayed or cyclically moved by a predetermined value in the time domain, the BCH signal may be expressed as Equation 3 below.

In Equation 3, X _k denotes a signal transmitted through a physical channel to which a BCH is mapped, N denotes an FFT size, T _g denotes an offset between repetitive sequences, and N _CS denotes a time domain in a BCH signal. Means a cyclic delay or a cyclically shifted value in.

For example, when using a signal pattern that is repeated twice in the time domain using an odd-numbered subcarrier set when transmitting BCH, the pattern due to cyclic delay or cyclic shift may be configured by using 4 patterns, and pattern 1 (460). ) Repeats the repeated sequence by 0 x N / 4 samples, and uses pattern 2 470 by circularly shifting the repeated sequence by 1 x N / 4 samples, and pattern 3 480 repeats the repeated sequence. The sequence is cyclically shifted by 2 x N / 4 samples, and pattern 4 490 is cyclically shifted by 3 x N / 4 samples. In the case of defining M patterns, a signal pattern is defined by defining various sequences of different delays or movements in consideration of the cyclic delay or cyclic movement of N / M samples. Accordingly, the MS of the second communication system acquires the position information of the BCH region as described above corresponding to the correlation of the repetitive signal in the time domain. Next, an operation of obtaining BCH information in the communication system according to the embodiment of the present invention will be described with reference to FIG. 5.

5 is a diagram illustrating a BCH location acquisition process of an MS in a communication system according to an embodiment of the present invention.

Referring to FIG. 5, in step 501, the MS of the second communication system acquires synchronization using a preamble signal transmitted through the preamble area. When the synchronization is obtained, the MS proceeds to step 503 and checks L1 signaling detection. That is, in step 503, when the MS of the second communication system detects the L1 signaling method determined according to the signal characteristics and patterns in the frequency domain or the time domain, the MS proceeds to step 505, and in step 505, the BCH corresponds to the L1 signaling. Obtain the location. Here, since the operation of acquiring the BCH location information corresponding to the L1 signaling has been described in detail above, a detailed description thereof will be omitted.

6 is a diagram illustrating a process of acquiring BCH transmission mode information of an MS in a communication system according to an embodiment of the present invention.

Referring to FIG. 6, in step 601, the MS of the second communication system acquires synchronization using a preamble signal transmitted through the preamble area, and proceeds to step 603 to determine whether L1 signaling is detected. If the MS detects L1 signaling in step 603, the MS recognizes a BCH corresponding to the detected L1 signaling and proceeds to step 605. In step 605, the MS acquires BCH transmission mode information and proceeds to step 607.

In step 607, the MS decodes the control information and the broadcast information received through the BCH region according to the identified BCH transmission mode and proceeds to step 609. Here, the BCH transmission mode may have various cases as described above. In this case, the BCH transmission mode may have various MCS levels for each BCH transmission mode, or may have, for example, QPSK 1/2 to have one basic MCS level. In step 609, the MS decodes the BCH according to the obtained BCH decoding information. Next, the structure of the MS in the communication system according to the embodiment of the present invention will be described with reference to FIG. 8.

Next, an operation of determining an operation mode between the first communication system and the second communication system in the communication system according to an embodiment of the present invention will be described with reference to FIG. 7. At this time, the first communication system and the second communication system coexist in the same frame. Also, depending on the cell situation, initial access to any system or handover to any system may be considered.

7 is a diagram illustrating a process of determining an operation mode of an MS between a first communication system and a second communication system in a communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 7, in step 701, the MS searches for a preamble signal, acquires synchronization, and proceeds to step 703. In step 703, the MS determines whether the BCH of the second communication system is detected. As a result of the determination, if the BCH is not detected, in step 705, the MS recognizes that the communication service provided by the first communication system is provided to the MS, that is, operates as the first communication system, and in step 707, the MS decodes the FCH. Acquire control information of the first communication system.

On the other hand, if it is determined in step 703 that the BCH of the second communication system is detected, in step 709, the MS recognizes that the communication service provided by the second communication system is provided to itself, that is, operates as the second communication system. In step 711, the BCH is decoded to obtain control information and broadcast information of the second communication system.

In addition, in step 703, BCH detection does not confirm BCH detection, but compares decoding and detection probabilities of common control information of the two systems. That is, the BCH detection probability of the second communication system and the FCH decoding probability of the first communication system can be compared. If the BCH detection probability of the second communication system is greater than the FCH decoding probability of the first communication system, the operation proceeds to step 709. If the BCH detection probability of the second communication system is smaller than the FCH decoding probability of the first communication system, step 705 is performed. Proceed and switch to the corresponding communication system operation mode.

In the communication system according to an embodiment of the present invention, an operation method will be described when the first communication system and the second communication system do not coexist and the second communication system exists alone. Hereinafter, a communication system in which the second communication system exists alone will be referred to as a third communication system in order to distinguish it from the first communication system and the second communication system.

8 schematically illustrates a frame structure for a third communication system according to an embodiment of the present invention.

Referring to FIG. 8, when the second system operates as a third system that does not coexist with the first system and exists alone, an area capable of independently performing synchronization for the third communication system should be provided. The third frame includes a synchronization channel (SCH) region 803 through which synchronization and control signals are transmitted. And a BCH region 801 through which common control information and broadcast information are transmitted.

Meanwhile, the position of the BCH region 801 may be indicated in the SCH region 803. That is, the position of the BCH region 801 may be indicated through the SCH region 803 instead of searching for the position of the BCH region 801 through a specific detection method. The BCH region indicated by the SCH region 803 of the F frame may be located in the F + 1 frame.

9 is a diagram illustrating an operation mode determination process of an MS in a communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 9, in step 902, the MS determines whether an SCH region for a third communication system exists in a frame. If it is determined that an SCH region for the third communication system exists in the frame, the process proceeds to step 904. In step 904, the MS recognizes that the MS operates as the third communication system. In step 906, the MS acquires synchronization through the SCH region and proceeds to step 908. In step 908, the MS decodes the BCH including common control information and broadcast information to obtain control information and broadcast information for the third communication system.

On the other hand, if the SCH region for the third communication system does not exist in the frame in step 902, the process proceeds to step 910. In step 910, the MS acquires synchronization using the preamble signal of the first communication system and proceeds to step 912. In step 912, the MS determines whether a BCH region for the second communication system exists in the frame. If the BCH region exists in the frame, go to step 914; otherwise, go to step 918.

In step 914, the MS recognizes that the MS should operate as the second communication system. In step 916, the MS decodes the BCH of the second communication system.

In step 918, the MS recognizes that the MS should operate as the first communication system. In step 920, the MS decodes the FCH of the first communication system. In the above, the BCH for the second communication system and the BCH for the third communication system may have the same form or may have another form.

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

Referring to FIG. 10, the MS 1000 uses a preamble signal transmitted through a preamble area to obtain a synchronizer 1010 and a common control information detector for detecting a BCH and an FCH to determine an operation mode. 1020 and a switching unit 1030 for switching with the first communication system modem 1040 or the second communication system modem 1050 to operate in an operation mode determined according to whether the common control information is detected. Here, since the operation of the MS in the communication system according to the embodiment of the present invention has been described in detail above, it will be described in detail herein.

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

Referring to FIG. 11, the MS 1100 detects a SCH to acquire synchronization by synchronizing a third communication system, and the third communication system modem 1125 according to whether the SCH is detected. Or a switching unit for switching to the second synchronizer 1115, a common control channel detector 1120, a first communication system modem 1140, and a second communication system modem 1150.

When the SCH of the third communication system is detected through the first synchronizer 1110, the MS 1100 operates to be compatible with the third communication system. If the SCH is not detected, the second synchronizer 1115 obtains synchronization using a preamble signal transmitted from the first communication system. The common control channel detector 1120 may determine an operation mode by detecting the BCH of the second communication system. Since the operation mode determination of the MS has been described in detail above, a detailed description thereof will be omitted herein.

12 is a diagram illustrating an operation mode determination process of an MS in a communication system according to an embodiment of the present invention.

Referring to FIG. 12, in step 1202, the MS determines whether an SCH region, that is, a reference signal region, for a first communication system exists in a frame. If it is determined that an SCH region for the first communication system exists in the frame, the process proceeds to step 1204. In step 1204, the MS performs synchronization using the preamble of the first communication system and proceeds to step 1206. In step 1206, the MS determines whether the BCH of the second communication system can be detected. As a result of the determination, when the BCH is detected, the MS operates as the second communication system in step 1208 and proceeds to step 1210. In step 1210, the MS decodes the BCH of the second communication system.

On the other hand, when the BCH detection of the second communication system fails in step 1206, the MS recognizes that the MS should operate as the first communication system in step 1212. In step 1214, the MS decodes the FCH of the first communication system.

If it is not the SCH of the first communication system in step 1202, in step 1216, the MS determines whether an SCH of the third communication system exists. As a result of the determination, in step 1218 when the SCH is present, the MS operates as a third communication system and proceeds to step 1220. In step 1220, the MS acquires synchronization through the SCH of the third communication system and proceeds to step 1222. In step 1222, the MS decodes the BCH of the third communication system.

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.

1 schematically illustrates a frame structure in a communication system according to an embodiment of the present invention.

2A and 2B schematically illustrate a frame structure in a communication system according to an embodiment of the present invention.

3A and 3B illustrate DL subframes in a communication system according to an embodiment of the present invention.

4A and 4B illustrate DL subframes in a communication system according to another embodiment of the present invention.

5 is a diagram illustrating a process of obtaining BCH location information in a communication system according to an embodiment of the present invention.

6 is a diagram illustrating an operation mode determination process between a first communication system and a second communication system in a communication system according to an embodiment of the present invention.

7 is a diagram illustrating a process of acquiring BCH decoding information in a communication system according to an embodiment of the present invention.

8 schematically illustrates the structure of an MS in a communication system according to an embodiment of the invention.

9 is a diagram illustrating an operation mode determination process of an MS in a communication system according to an embodiment of the present invention.

10 schematically illustrates the structure of an MS in a communication system according to an embodiment of the invention.

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

12 is a diagram illustrating an operation mode determination process of an MS in a communication system according to an embodiment of the present invention.

Claims (49)

A signal transmission method of a base station in a communication system, There is a first communication system and a second communication system, the second communication system is a system evolved from the first communication system can use the control signal and the broadcast signal used in the first communication system, Transmitting a first message including common control information and frame control information of the first communication system in a first frame; Transmitting a second message including common control information and frame control information of the second communication system in a second frame; And transmitting and signaling position information of the second message in the second frame. The method of claim 1, The signaling and transmitting may include transmitting location information of the second message using signal characteristics and patterns in a frequency domain. The method of claim 2, And a signal characteristic and a pattern in the frequency domain are reference signal patterns for a region in which the second message is transmitted in the second frame. The method of claim 3, And the reference signal is a pilot signal. The method of claim 2, The signal characteristic and the pattern in the frequency domain is a signal transmission method, characterized in that the pre-signal pattern for the area in which the second message is transmitted in the second frame. The method of claim 5, And the pre-signal is a preamble signal. The method of claim 2, The signal characteristic and the pattern in the frequency domain is a signal transmission method, characterized in that the post signal pattern for the region in which the second message is transmitted in the second frame. The method of claim 7, wherein And the post signal is a preamble signal. The method of claim 1, The signaling and transmitting may include transmitting location information of the second message using signal characteristics and patterns in a time domain. The method of claim 9, And the signal characteristic and pattern in the time domain are signal patterns obtained through a subcarrier set. The method of claim 10, The signaling and transmitting may include transmitting and defining a sequence in a signal pattern acquired through the subcarrier set. The method of claim 10, The signal pattern obtained through the subcarrier set is a signal pattern using the same set of subcarriers. The method of claim 9, And a signal characteristic and a pattern in the time domain are signal patterns using a repetitive sequence when transmitting the second message. The method of claim 13, And the signal pattern using the repetitive sequence is a signal pattern for cyclically delaying or cyclically moving the repetitive sequence by a predetermined size. In the communication system receiving signal of the terminal, There is a first communication system and a second communication system, the second communication system is a system evolved from the first communication system can use the control signal and the broadcast signal used in the first communication system, Receiving a first message including common control information and frame control information of the first communication system in a first frame; Receiving a second message including common control information and frame control information of the second communication system in a second frame; And acquiring position information of the second message in the second frame. The method of claim 15, The process of acquiring position information of the second message may include detecting a signal pattern in a frequency domain and acquiring position information of the second message according to a correlation between the detected signal patterns. Way. The method of claim 16, The detecting of the signal pattern in the frequency domain may include detecting a signal pattern by measuring a correlation between a preset sequence and a signal received when the second message is received. The method of claim 15, The acquiring of the position information of the second message may include detecting a signal pattern in a time domain and acquiring position information of the second message according to a correlation between the detected signal patterns. Way. The method of claim 18, The obtaining of the position information of the second message may include measuring a correlation corresponding to the repetition pattern in the time domain and obtaining position information of the second message with a repetition characteristic according to the measured correlation. A signal receiving method characterized in that. The method of claim 15, The process of acquiring position information of the second message may include detecting a signal pattern in a time domain, measuring received power for each subcarrier set of the detected signal pattern, and corresponding to the measured received power. And receiving position information of the second message. The method of claim 15, The acquiring position information of the second message may include detecting a signal pattern in a time domain and further obtaining transmission mode information of the second message according to the detected signal pattern. . The method of claim 21, The acquiring of the transmission mode information of the second message may include receiving a communication service from the first communication system or a communication service from the second communication system according to the identified transmission mode. . In a signal transmission system in a communication system, There is a first communication system and a second communication system, the second communication system is a system evolved from the first communication system can use the control signal and the broadcast signal used in the first communication system, A first message including common control information and frame control information of the first communication system in a first frame, and a second message including common control information and frame control information of the second communication system in a second frame And a base station for signaling and transmitting location information of the second message in the second frame. The method of claim 23, wherein And the base station transmits position information of the second message using signal characteristics and patterns in a frequency domain. The method of claim 24, The signal characteristic and the pattern in the frequency domain is a signal transmission system, characterized in that the reference signal pattern for the area in which the second message is transmitted in the second frame. The method of claim 26, And the reference signal is a pilot signal. The method of claim 24, And a signal characteristic and a pattern in the frequency domain are pre-signal patterns for the region in which the second message is transmitted in the second frame. The method of claim 27, The pre-signal is a preamble signal. The method of claim 24, The signal characteristic and the pattern in the frequency domain is a signal transmission system, characterized in that the post signal pattern for the area in which the second message is transmitted in the second frame. The method of claim 29, The post signal is a preamble signal. The method of claim 23, wherein The base station transmits the position information of the second message using the signal characteristics and patterns in the time domain. The method of claim 31, wherein And the signal characteristic and pattern in the time domain are signal patterns acquired through a subcarrier set. 33. The method of claim 32, The base station, the signal transmission system, characterized in that for transmitting the signal after defining a sequence to the signal pattern obtained through the subcarrier set. 33. The method of claim 32, And a signal pattern obtained through the set of subcarriers is a signal pattern using the same set of subcarriers. The method of claim 31, wherein And the signal characteristic and pattern in the time domain are signal patterns using a repetitive sequence when transmitting the second message. 36. The method of claim 35 wherein And the signal pattern using the repetitive sequence is a signal pattern for cyclically delaying or cyclically moving the repetitive sequence by a predetermined size. In a signal receiving system in a communication system, There is a first communication system and a second communication system, the second communication system is a system evolved from the first communication system can use the control signal and the broadcast signal used in the first communication system, Receive a first message including resource allocation information of the first communication system in a first frame, Receive a second message containing resource allocation information of the second communication system in a second frame, The second frame And a terminal for acquiring location information of the second message. The method of claim 37, And the terminal detects a signal pattern in a frequency domain and obtains position information of the second message in accordance with a correlation between the detected signal patterns. The method of claim 38, The terminal detects a signal pattern by measuring a correlation between a preset sequence and a signal received when the second message is received. The method of claim 37, And the terminal detects a signal pattern in a time domain and obtains position information of the second message in accordance with a correlation between the detected signal patterns. The method of claim 40, The terminal may measure a correlation corresponding to the repetition pattern in the time domain, and acquire position information of the second message with a repetition characteristic according to the measured correlation. The method of claim 37, The terminal detects a signal pattern in a time domain, measures reception power for each subcarrier set of the detected signal pattern, and acquires position information of the second message in accordance with the measured reception power. Signal receiving system, characterized in that. The method of claim 37, And the terminal detects a signal pattern in a time domain and further obtains transmission mode information of the second message in accordance with the detected signal pattern. The method of claim 43, And the terminal receives a communication service from the first communication system or a communication service from the second communication system according to the checked transmission mode. A signal reception method of a mobile station in a communication system, In a situation where a third communication system in which a first communication system and a second communication system evolved from the first communication system coexist, and a fourth communication system in which the second communication system exists alone are present in a mixed state, 4 determining whether to receive a reference signal for the communication system, Receiving a reference signal of the first communication system to obtain synchronization when the reference signal for the fourth communication system is not received; Determining whether to receive common control information for the second communication system; Decoding common control information for the second communication system when receiving common control information for the second communication system. The method of claim 45, And receiving and decoding the frame control header of the first communication system if the common control information of the second communication system is not received. The method of claim 45, Receiving a reference signal of the fourth communication system, acquiring synchronization with the fourth communication system; And receiving and decoding the common control information of the fourth communication system. The method of claim 45, And a reference signal for the fourth communication system is a unique signal. The method of claim 45, And the reference signal of the fourth communication system indicates the position of the common control information.

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