JP2009533943A - Apparatus and method for supporting relay service in multi-hop relay broadband wireless access communication system - Google Patents

Abstract

An apparatus and method for supporting a relay service in a multi-hop relay wideband wireless access communication system having an advantage of eliminating interference between a direct service and a relay service in a cell. .
The present invention relates to a subframe for a link between a base station and a terminal during a first period of a subframe, a subframe for a link between a first relay station and a terminal that provides a synchronization channel, Configuring at least one of subframes for a link of a second relay station that does not provide a synchronization channel with the base station, and the base station and the first during a second period of the subframe Forming at least one of a subframe for a link of the relay station, a subframe for a link of the relay station and the relay station, and a subframe for the link of the second relay station and the terminal, A method of including is provided.
[Selection] Figure 7

Description

  The present invention relates to a multi-hop relay type broadband wireless access communication system, and more particularly, to a synchronization channel synchronized between a terminal and a relay station in the multi-hop relay type broadband wireless access communication system. An apparatus and method for providing and avoiding near-far interference between a direct service and a relay service in a cell.

  One of the most important requirements in the fourth generation communication system is a self-configurable wireless network configuration. The self-configuring wireless network refers to a wireless network that can provide mobile communication services by configuring the wireless network autonomously or in a distributed manner without controlling a central system. In general, in the fourth generation communication system, a cell having a very small radius must be configured in order to enable high-speed communication and a large amount of call. In this case, it is expected that the fourth generation communication system cannot be centrally designed. For this reason, the fourth generation communication system must actively cope with environmental changes such as the addition of new base stations while being controlled and constructed in a distributed manner. Therefore, in the fourth generation communication system, a self-configuration type wireless network is required.

  In order to realistically implement a self-configuration wireless network required in the fourth generation communication system, a technology applied in an ad-hoc network must be incorporated in the wireless connection communication system. . A typical example of this is a multi-hop relay type broadband wireless access communication system, which adopts an ad hoc multi-hop relay technique in a broadband wireless access network composed of fixed base stations.

  In general broadband wireless access communication systems, communication is performed between a fixed base station (Base station) and a terminal (Mobile station) through a single direct link, and therefore, between the terminal and the base station. In addition, a highly reliable wireless communication link can be easily configured. However, since the position of the base station is fixed in the broadband wireless access communication system, the configuration of the wireless network is low. For this reason, it is difficult for the broadband wireless access communication system to provide a highly efficient service in a wireless environment in which traffic distribution and call request amount change drastically.

  In order to overcome such inconvenience, the broadband wireless access communication system may use a relay service that transmits data in a multi-hop form using a plurality of peripheral terminals or relay stations. The broadband wireless access communication system using the multi-hop relay system can quickly reconfigure a network according to changes in the communication environment, and can operate the entire wireless network with higher efficiency. In the broadband wireless access communication system, a relay station is installed between a base station and a terminal, and a multi-hop relay path through the relay station is configured, so that a radio channel having a better channel state can be provided to the terminal. Can be provided. That is, the broadband wireless access communication system can provide a higher-speed data channel by providing a service using a multi-hop relay scheme through a relay station in a cell boundary region where the channel state from the base station is poor. And the cell service area can be expanded.

  FIG. 1 shows a structure for providing a service using a multi-hop relay system in a general broadband wireless access communication system.

  As shown in FIG. 1, terminals 140, 150, 160, and 170 included in a broadband wireless access communication system using a multi-hop relay scheme are connected to a broadband wireless network via a base station 100 and relay stations 110, 120, and 130. Provided connection service.

  That is, the terminals 140 and 150 included in the cell service area 101 of the base station 100 communicate with the base station 100 directly using the terminal link L1. In this case, the terminal 2 (150) located in the cell boundary region of the base station 100 and having a poor channel state directly communicates by using the relay terminal link L2 of the relay station 2 (130). A data channel faster than the terminal link L1 can be provided.

  Terminals 160 and 170 located outside the cell service area 101 of the base station 100 communicate with the base station 100 through the relay terminal link L3 of the relay station 1 (110). That is, the base station 100 can expand the cell area by providing a communication link to the terminals 160 and 170 located outside the cell service area using the relay station 1 (110). In this case, the terminal 4 (170) located in the cell boundary region of the relay station 1 (110) and having a poor channel state increases the transmission capacity by using the relay terminal link L4 of the relay station 2 (120). Can be made.

  As described above, in the broadband wireless access communication system, when the terminal is located outside the service area of the base station or is located in a shaded area where the shielding phenomenon is severe due to a building or the like, the relay state is poor. A station is used to provide a better radio channel to the terminal to communicate with the base station.

  That is, the base station can provide a high-speed data channel by applying a multi-hop relay scheme in a cell boundary region and a shaded region where channel conditions are poor, and can expand the cell service region.

  In this case, the relay stations 110, 120, and 130 are connected to a relay station that provides a synchronization channel like the relay station 1 (110) and a synchronization channel like the relay station 2 (120, 130). It is divided into relay stations that do not provide

  In a general broadband wireless access communication system, transmission / reception of information between a base station and a terminal is performed based on a frame having a structure as shown in FIG. 2 through a direct link. Here, FIG. 2 shows an IEEE (Institute of Electrical and Electronics Engineers) 802.16 standard time division duplex frame structure for transmitting and receiving information between the base station and the terminal. The structure is shown as an example.

  FIG. 2 shows a frame structure for a general IEEE 802.16 system.

  As shown in FIG. 2, the time division duplex frame 200 is divided into a downlink subframe 210 and an uplink subframe 220. In this case, a TTG (Transmit / Receive Transition Gap) of a time protection region (Guard region) is located between the downlink subframe 210 and the uplink subframe 220, and between the frames, RTG (Receive / Transmit Transition Gap) is located.

  The downlink subframe 210 has a preamble and common control information in a fixed position (Mandatory slot). A terminal included in the service area of the base station can receive the preamble and common control information to obtain synchronization and control information.

  As described above, the broadband wireless access communication system provides a service to a terminal or a relay station located outside the cell area of the base station or in a shaded area using a relay station. In this case, the broadband wireless access communication system performs communication using a frame structure configured as shown in FIG. 2 so as to maintain backward compatibility of the terminal.

  That is, the relay station operates like a terminal during initial connection operation and negotiates with the base station for relay management, and then relays to the terminal using the frame structure of FIG. 2 in the same manner as the base station. Service can be provided. In this case, since the relay station provides a relay service using the same frame structure as the base station, communication with the base station and communication with the terminal for one frame within one frequency band. Are difficult to perform at the same time. That is, when communication is performed using the frame structure of FIG. 2, a problem of RF isolation occurs. Therefore, in order to solve the RF isolation problem of the relay station, the broadband wireless access communication system configures a frame as shown in FIG. 3 so that transmission / reception operations of the relay station are performed in parallel.

  FIG. 3 shows a TDD frame structure of a conventional multi-hop relay broadband wireless access communication system.

  As shown in FIG. 3, the subframes 300 and 310 are divided into first regions 301 and 311 and second regions 303 and 313 by time multiplexing in order to change the operation of the relay station. Here, the sizes of the first regions 301 and 311 and the second regions 303 and 313 may be fixed or variable depending on the cell environment.

  The broadband wireless access communication system provides a direct link service between the first areas 301 and 311 and provides a relay link service between the second areas 303 and 313. Accordingly, the base station provides a synchronization channel, a control channel, and a traffic channel to terminals connected by a direct link through the first regions 301 and 311. In addition, the base station provides a synchronization channel, a control channel, and a traffic channel to the relay station through the second areas 303 and 313.

  In the multi-hop relay broadband wireless access communication system, the mobility of the relay station must be considered. For example, the relay station may move as shown in FIG.

  FIG. 4 shows movement of a relay station in a multi-hop relay broadband wireless access communication system according to the prior art.

  As shown in FIG. 4, when the relay station 420 is installed in a transportation means such as a bus or a train, the relay station 420 has mobility.

  In this case, the broadband wireless access communication system must provide a synchronization channel for synchronization and cell search in consideration of the mobility of the relay station 420.

  However, in the broadband wireless access communication system, when the frame structure as illustrated in FIG. 3 is used, the lengths of the first region 301 and the second region 303 in the downlink subframe 300 are determined according to the cell environment. It may be variable. In this case, since the position of the synchronization channel located at the front end of the second area 303 varies depending on the cell environment, the relay station 420 has various overheads such as knowing the position of the synchronization channel of the adjacent base station. To do. For example, the overhead is caused by an increase in interference with adjacent cells due to a synchronization channel power boost, information transmission of adjacent base stations, a synchronization channel search for each adjacent base station, and the like.

  When the synchronization channel is not provided like the relay station 2 (120, 130) in FIG. 1, the relay station 2 (120, 130) provides the relay service together with the base station through multiplex communication within the cell. . In this case, in the broadband wireless access communication system, as shown in FIG. 5, the terminal is provided from the base station 100 or the upper relay station 110 and the relay station 2 (120, 130). Far-near interference occurs due to the power difference with the signal.

  FIG. 5 shows a signal flow for providing a relay service at a relay station in a multi-hop relay broadband wireless access communication system according to the prior art.

  As shown in FIG. 5, the terminal 1 (530) having a good channel environment in the cell region is provided with a service through a direct link from the base station 500, and the terminal 2 (520) having a poor channel environment is provided by the relay station 510. Serviced through.

  The base station 500 and the relay station 510 perform multiplex communication using orthogonal resources in the same time domain, but the base station link signal and the relay station link signal are superimposed on radio resources (air). . In this case, the terminal 1 (530) may cause near-far interference in which an interference signal from an adjacent relay station 510 is received with higher power than the original signal from the base station 500. In the case of the uplink, the relay station 510 may cause near-far interference in which an interference signal from the terminal 1 (530) is received with higher power than an uplink signal from the terminal 2 (520). .

  Accordingly, an object of the present invention is to provide an apparatus and method for supporting cell search and synchronization by mobility of a relay station in a multi-hop relay broadband wireless access communication system with high efficiency.

  Another object of the present invention is to provide a synchronized channel in a multi-hop relay wideband wireless access communication system, and to support cell search and synchronization due to mobility of a relay station with high efficiency, and It is to provide a method.

  It is still another object of the present invention to provide an apparatus and method for reducing near-field interference due to multiplex communication in a cell in a multi-hop relay type broadband wireless access communication system.

  Still another object of the present invention is to provide an apparatus and a method for time-multiplexing relay communication and direct communication in a cell in a multi-hop relay broadband wireless access communication system to eliminate near-field interference between the two communications. Is to provide.

  Still another object of the present invention is to provide a synchronized synchronization channel in a multi-hop relay broadband wireless access communication system, and to provide a frame configuration method for eliminating near-far interference and an apparatus for supporting the same. It is in.

  According to a first aspect of the present invention for achieving the above object, a subframe configuration method for supporting a relay service in a wireless communication system includes a link between a base station and a terminal during a first section of a subframe. At least a subframe for a link between a first relay station and a terminal providing a synchronization channel and a link for a second relay station not providing a synchronization channel with the base station A subframe for a link between the base station and the first relay station, a subframe for a link between the relay station and the relay station, during a process of configuring one and a second period of the subframe, Forming at least one of subframes for a link between the second relay station and the terminal.

  According to a second aspect of the present invention, a downlink subframe configuration method in a wireless communication system includes a subframe for a link between a base station and a terminal, a relay station, during a first interval of a downlink subframe, A first group of relay stations and an even number of hop relay stations that are a set of odd hop relay stations during a process of forming a subframe for a link of a terminal and a second interval of the downlink subframe Forming a subframe for the link of the next hop relay station included in the second group that is a set of the base station and the one hop relay station during a third period of the downlink subframe And a subframe for a link of the second group of relay stations and a next hop relay station included in the first group. Characterized in that it comprises a and.

  According to a third aspect of the present invention, a downlink subframe configuration method in a wireless communication system includes a subframe for a link between a base station and a terminal, a relay station, during a first interval of a downlink subframe. A subframe for a link of a terminal, a subframe for a link between the base station and the one-hop relay station, and an even-number of hop relay stations during a second period of the downlink subframe A sub-frame for a link of a next hop relay station included in the first group that is a set of odd-numbered hop relay stations and a second group of relay stations that is a set of Configuring a subframe for a link between the first group of relay stations and the next hop relay station included in the second group during a third interval of the subframe , Characterized in that it comprises a.

  According to a fourth aspect of the present invention, an uplink subframe configuration method in a wireless communication system includes a subframe for a link between a terminal and a base station, a terminal, and a relay station during a first interval of the uplink subframe. The second group of relay stations and the odd hop relay stations, which are a set of even hop relay stations, during the process of configuring the subframes for the second link and the second period of the uplink subframe A process of constructing a subframe for a link of a previous hop relay station included in a first group which is a set, and a link between a 1 hop relay station and a base station during a third period of the uplink subframe And a subframe for a link of a previous hop relay station included in the first group of relay stations and the second group , Characterized in that it comprises a.

  According to a fifth aspect of the present invention, an uplink subframe configuration method in a wireless communication system includes a subframe for a link between a terminal and a base station, a terminal and a relay during a first interval of the uplink subframe. A subframe for a link between a station, a subframe for a link between a 1-hop relay station and a base station, and a set of odd-hop relay stations during a second period of the uplink subframe Forming a subframe for a link of a previous hop relay station included in a second group that is a set of relay stations of the first group and an even number of hop relay stations; and Configuring a subframe for a link between the second group of relay stations and a previous hop relay station included in the first group during a third interval , Characterized in that it comprises a.

  According to a sixth aspect of the present invention, a method for operating a base station in a wireless communication system includes a first section for communicating with a terminal or a second relay station that does not provide a synchronization channel, and a first section that provides a synchronization channel. Allocating resources for a second interval for communicating with one relay station, and, after allocating the resources, using the first interval to communicate with the terminal or the second relay station And a step of performing communication with the first relay station using the second section.

  According to a seventh aspect of the present invention, an operation method of a relay station that provides a synchronization channel in a wireless communication system includes a first section for performing communication with a terminal using control information received from an upper node, A process of setting a second section for performing communication with the upper node or a lower relay station for relay service, and a process of performing communication with the terminal using the first section; And performing communication with the upper node or the lower relay station using the second section.

According to an eighth aspect of the present invention, an operation method of a relay station that does not provide a synchronization channel in a wireless communication system is a first method for communicating with the upper node using control information received from an upper node. And a process of setting a second section for communicating with the terminal, a process of communicating with the upper node using the first section, and using the second section And communicating with the terminal.
According to the ninth aspect of the present invention, a base station apparatus in a radio communication system provides a first section for performing communication with a terminal or a second relay station that does not provide a synchronization channel, and a synchronization channel. A timing controller that provides a transmission / reception timing signal of a signal by a subframe configuration divided into a second interval for performing communication with one relay station, and a signal in the first interval or a second interval by the timing signal A transmitter that forms and transmits the signal and a receiver that receives the signal of the first section or the signal of the second section by the timing signal and restores the data.

  According to the tenth aspect of the present invention, a relay station apparatus that provides a synchronization channel in a wireless communication system includes a first section for performing communication with a terminal or a second relay station that does not provide a synchronization channel, A timing controller that provides a signal transmission / reception timing signal by a subframe configuration divided into a second section for communicating with a node; and a signal in the first section or a signal in the second section by the timing signal A transmitter configured to transmit; and a receiver that receives a signal in a first section or a signal in a second section by the timing signal to restore data.

  As described above, by providing a synchronization control channel that is synchronized between a terminal and a relay station in a multi-hop relay broadband wireless communication system, synchronization and cell search due to movement of the relay station can be easily performed. There is an advantage that it is possible to time-multiplex the relay communication and the direct communication in the cell so as to eliminate the near-far interference between the relay communication and the direct communication in the cell.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, when it is determined that a specific description for a related known function or configuration makes the gist of the present invention unclear, a detailed description thereof will be omitted.

  Hereinafter, the present invention provides a synchronization channel synchronized to support the mobility of a relay station in a multi-hop relay broadband wireless access communication system, and eliminates near-field interference due to multiplex communication in a cell. The technology will be described. In the following description, a radio communication system using a time division duplex and orthogonal frequency division multiplexing access system will be described as an example, and other multiple access systems and other division duplex based communication systems will be described. Is equally applicable.

  In the following description, the relay station 1 means a relay station used for expanding a cell area, and the relay station 2 means a relay station used for capacity increase. That is, the relay station 1 provides a synchronization and control channel and a traffic channel to a terminal or relay station located outside the base station cell area, and the relay station 2 is located in the cell area and has a channel state. Provide only unicast control and traffic channels to poor terminals.

  In the following description, a subframe structure for performing communication between the base station and the relay station will be described using the same configuration as the frame structure of the IEEE 802.16 system as an example. The advanced technology it has may be applied. Further, the present invention is similarly applied to communication between the upper relay station and the lower relay station.

  FIG. 6 illustrates a frame structure for providing a synchronization channel synchronized with a terminal or a relay station in a multi-hop relay broadband wireless access communication system according to an embodiment of the present invention.

  As shown in FIG. 6, the frame includes a downlink subframe 610 and an uplink subframe 620. At this time, the sub-frames 610 and 620 are divided into first regions 611 and 621 and second regions 613 and 623 by time multiplexing.

  Here, the first regions 611 and 621 and the second regions 613 and 623 have a fixed length or are variable depending on the cell environment.

  The base station communicates with terminals connected by direct links in the first areas 611 and 621 of the frame 600, and communicates with relay stations in the second areas 613 and 623. At this time, since the sizes of the first areas 611 and 621 and the second areas 613 and 623 are variable depending on the cell environment, the base station provides a synchronized channel synchronized with the terminal and the relay station. In order to do so, a synchronization channel is allocated to the front end of the first region 611 and the rear end of the second region 613 of the downlink subframe 610. Also, the base station allocates the connection channel to the front end of the first region 621 and the rear end of the second region 623 of the uplink subframe 620 for the connection channel of the terminal. Here, the connection channel (ranging slot) in the uplink subframe 620 may be designated through a control channel instead of a fixed position.

  Accordingly, the base station provides a synchronization channel for the terminal in a preamble form so that the terminal can be easily synchronized and a cell search can be performed. In addition, the base station provides a synchronization channel for the relay station in a postamble form so that the relay station can be easily synchronized and a cell search can be performed. As described above, the base station configures the front end and the rear end of the downlink subframe with the synchronization channel, so that the terminal or the relay station obtains the synchronization information and the adjacent base station information from the synchronization channel at a fixed position. Can do. At this time, the synchronization channel for the relay station may be used for interference measurement in the base station.

  In the multi-hop relay broadband wireless access communication system, there is multiplex communication by the base station, the relay station 1, the relay station 2, and the terminal.

  Since the base station and the relay station 2 provide services to terminals in the cell area, in order to eliminate interference between two links (base station-terminal link, relay station 2 terminal link). Allocate orthogonal resources. Here, a large number of relay stations can reuse the orthogonal resources allocated to the relay station 2 in the form of spatial multiplexing.

  In this case, the broadband wireless access communication system can separate the link signal between the base station and the terminal and the link signal between the relay station 2 and the terminal in the frequency domain. They cannot be separated and exist in overlapping form. Therefore, when the base station and the relay station 2 communicate with the terminal in the same time domain, near-far interference occurs.

  As shown in FIG. 7, the broadband wireless access communication system does not allocate the link between the base station and the terminal and the link between the relay station 2 and the terminal in the same time domain. That is, the broadband wireless access communication system allocates the link between the relay station 2 and the terminal to certain resources in the second areas 613 and 623 in FIG.

  FIG. 7 shows a frame structure of a multi-hop relay broadband wireless access communication system according to the first embodiment of the present invention.

  The following description shows a frame structure for allocating resources in the frequency division form to the relay station 1 and the relay station 2 in FIG.

  As shown in FIG. 7, the frame includes a downlink subframe 720 and an uplink subframe 730. At this time, the subframes 720 and 730 are divided into first regions 721 and 731 and second regions 723 and 733 by time multiplexing.

  Here, the first regions 721 and 731 and the second regions 723 and 733 have a fixed length or are variable depending on the cell environment.

  The relay station 2 communicates with the base station during the first areas 721 and 731 of the base station frame 700, is assigned certain areas 711 and 713 in the second areas 723 and 733, and Communication. Here, when there are a large number of relay stations 2, it is considered that the second areas 723 and 733 are space-division multiplexed and resources are reused.

  At this time, the relay station 1 provides a transparent relay service to the terminal between the first areas 721 and 731 and communicates with the base station between the second areas 723 and 733. .

  As described above, when a frame is formed by spatial multiplexing and time multiplexing, the base station, relay station 1, relay station 2, and terminal operate as shown in FIG.

  FIG. 8 shows signal transmission / reception timing based on the frame structure in the multi-hop relay broadband wireless access communication system according to the embodiment of the present invention.

  As shown in FIG. 8, in the downlink subframe 720, the base station 800 transmits a synchronization channel and a control channel to the relay station 2 (820) or the terminal 830 connected via a direct link between the first regions 721. And transmit traffic bursts. Thereafter, the base station 800 transmits a control channel, a traffic burst, and a synchronization channel to the relay station 1 (810) during the second region 723. At this time, the base station 800 provides the synchronization channel to the front end of the first area 721 and the second area 723 in order to provide the synchronization channel synchronized with the terminal 830 and the relay stations 810 and 820. Transmit at the rear end.

  The relay station 1 (810) transmits a synchronization channel, a control channel, and a traffic burst to the relay station 2 (820) or the terminal 830 connected via a relay link between the first areas 721. Thereafter, the relay station 1 (810) receives a synchronization channel, a control channel, and a traffic burst transmitted by the base station 800 during the second region 723.

  The relay station 2 (820) receives a control channel and a traffic burst necessary for performing the relay service from the base station 800 during the first area 721. Thereafter, the relay station 2 (820) transmits a traffic burst to a terminal 830 connected by the relay link between certain areas 711 of the second area 723.

  The terminal 830 receives a synchronization channel, a control channel, and a traffic burst from the base station 800 or the relay station 1 (810) during the first region 721. Thereafter, the terminal 830 receives a signal from the relay station 1 (810) or the relay station 2 (820) during the second region 723. At this time, the terminal 830 receives a traffic burst from the relay station 2 (820) during the partial resource of the second area 723.

  In order to avoid the near-field interference in the broadband wireless access communication system, as shown in FIG. 7, in the second areas 723 and 733, a communication area for the link between the relay station 2 and the terminal, and the relay station 1 and the communication area for the link between the base station is allocated by frequency division.

  As another embodiment, the broadband wireless access communication system includes a communication area for a link between the relay station 2 and a terminal in the second areas 723 and 733, and the relay station, as shown in FIG. The communication area for the link between 1 and the base station can also be allocated in a time division manner.

  FIG. 9 shows a frame structure of a multi-hop relay broadband wireless access communication system according to the second embodiment of the present invention. The following description shows the structure of the base station frame and the relay station 2 frame.

  As shown in FIG. 9, the frame includes a downlink subframe 720 and an uplink subframe 730. At this time, the subframes 720 and 730 are divided into first regions 721 and 731 and second regions 723 and 733 by time multiplexing. Here, the second areas 723 and 733 are divided into the communication areas 900 and 920 of the relay station 2 and the terminal, and the communication areas 910 and 930 of the relay station 1 and the base station. At this time, the base station provides the relay station 1 with a fixed-position synchronization channel in a postamble form. Therefore, in the second areas 723 and 733, the communication areas 900 and 920 between the relay station 2 and the terminal are positioned in front of the communication areas 910 and 930 of the relay station 1 and the base station.

  The base station 700 communicates with the relay station 2 or the terminal between the first areas 721 and 731. Thereafter, communication with the relay station 1 is performed between the second areas 723 and 733. Here, the base station 700 does not use the communication areas 900 and 920 between the relay station 2 and the terminals in the second areas 723 and 733 in order to eliminate in-cell interference. Therefore, the base station 700 communicates with the relay station 1 between the communication areas 910 and 930 of the relay station 1.

  At this time, the base station 700 allocates a synchronization channel or a connection channel to the rear end of the communication areas 910 and 930 of the relay station 1 in order to provide a synchronous channel to the relay station 1.

  The relay station 2 (710) communicates with the base station 700 between the first areas 721 and 731. Thereafter, the relay station 2 (710) performs communication with the terminal during the communication areas 900 and 920 between the relay station 2 and the terminal in the second areas 723 and 733. At this time, the relay station 2 (710) does not use the communication areas 910 and 930 of the relay station 1 in order to eliminate intra-cell interference.

  The above-described embodiment has been described by taking the broadband wireless access communication system including two hops as an example. In another embodiment, the broadband wireless access communication system may be configured as multi-hop as shown in FIG.

  FIG. 10 shows a configuration of a multi-hop relay type broadband wireless access communication system according to the present invention.

  As shown in FIG. 10, the base station 1 (1001) communicates with the terminal 1019 using a relay link composed of a plurality of relay stations 1011, 1013, 1015, and 1017.

  At this time, the relay stations 1011, 1013, 1015, and 1017 are divided into a first group and a second group. For example, when the base station 1001 is set as a 0-hop link relay station, the first group includes the base station 1001, the 2-hop relay station 1013, the 4-hop relay station 1017, etc. as even-numbered hop link groups. . In this case, the second group includes a 1-hop relay station 1011, a 3-hop relay station 1015, and the like as an odd-numbered hop link group.

  If the base station 1001 is not set as a 0 hop link relay station, the first group includes the 1 hop relay station 1011, the 3 relay station 1015, etc. as an odd hop link group. The second group includes the 2-hop relay station 1013 and the 4-hop relay station 1017 as even-numbered hop link groups.

  As described above, when the broadband wireless access communication system configures a multi-hop link with a first group and a second group, the broadband wireless access communication system includes frames configured as shown in FIGS. Use to communicate. In the following description, the odd hop link relay station group is assumed to be the first group. Further, in the following description, the second region and the third region constituting the subframe may be configured by dividing the second region of FIG.

  First, the broadband wireless access communication system configures a downlink subframe as shown in FIG.

  FIG. 11 shows a downlink subframe structure of a multi-hop relay broadband wireless access communication system according to an embodiment of the present invention.

  As shown in FIG. 11, the downlink subframe is divided into a first area 1101, a second area 1103, and a third area 1105 by time multiplexing.

  First, the base station frame 1110 constitutes a downlink subframe to be transmitted in the first area 1101 and the second area 1103 to terminals included in the service area of the base station. Here, the subframe 1110 of the base station may be configured to be null between the second regions 1103 in order to eliminate interference between the terminal and the relay station. At this time, the base station positions a synchronization channel for the terminal in a preamble form at the front end of the first region 1101.

  The base station frame 1110 forms a downlink subframe to be transmitted to the 1-hop relay station included in the first group during the third region 1105.

  At this time, the base station positions a synchronization channel for the one-hop relay station in a postamble form at the rear end of the third region 1105.

  Next, the frame 1120 of the first group relay station constitutes a downlink subframe to be transmitted to terminals included in the service area of the first group relay station between the first areas 1101. At this time, the first group relay station positions a synchronization channel for the terminal in the form of a preamble at the front end of the first area 1101.

  The frame 1120 of the first group relay station constitutes a downlink subframe to be transmitted to the next hop relay station included in the second group during the second region 1103.

  At this time, the first group relay station positions a synchronization channel for the next hop relay station included in the second group in a postamble form at the rear end of the second area 1103.

  The frame 1120 of the first group relay station receives a downlink subframe transmitted by a previous hop relay station included in the second group during the third region 1105. Here, when the first group relay station is a 1-hop relay station, the 1-hop relay station receives a downlink subframe transmitted by the base station during the third region 1105.

  At this time, between the second area 1103 and the third area 1105, there is a TTG which is a time protection area for changing the operation of the first group relay station. Therefore, the first group relay station transmits a synchronization channel for the second group relay station to the second group relay station using the section resources before the TTG in the second area 1103. To transmit.

  Next, the relay station frame 1130 included in the second group constitutes a downlink subframe to be transmitted to terminals included in the service area of the second group relay station between the first areas 1101. At this time, the second group relay station positions a synchronization channel for the terminal in the form of a preamble at the front end of the first area 1101.

  The frame 1130 of the second group relay station receives a downlink subframe transmitted by a previous hop relay station included in the first group during the second region 1103.

  The frame 1130 of the second group relay station constitutes a downlink subframe to be transmitted to the next hop relay station included in the first group during the third region 1105.

  Here, the second group relay station positions a synchronization channel for the next hop relay station included in the first group in a postamble form at the rear end of the third region 1105.

  At this time, a TTG, which is a time protection area for switching the operation of the relay station, exists between the first area 1101 and the second area 1103 of the frame 1130 of the second group relay station. Also, between the second area 1103 and the third area 1105 of the frame 1130 of the second group relay station, there is an RTG that is a time protection area for switching the operation of the relay station.

  Although not shown, when the relay station included in the first group is a terminal hop relay station, transmission is performed in the first area 1101 and the second area 1103 to terminals included in the service area of the relay station. A downlink subframe to be configured. Here, the terminal hop relay station may configure the second region 1103 with a null in order to eliminate interference between the terminal and the relay station.

  The terminal hop relay station receives a downlink subframe from a previous hop relay station included in the second group during the third region 1105.

  If the terminal hop relay station is included in the second group, a downlink sub-station that transmits to the terminal included in the service area of the relay station in the first area 1101 and the third area 1105. Construct a frame. Here, the terminal hop relay station can configure the third region 1105 with a null in order to eliminate interference between the terminal and the relay station.

  The terminal hop relay station receives a downlink subframe from a previous hop relay station included in the first group during the second region 1103.

  In the broadband wireless access communication system, when a frame is configured as shown in FIG. 11, the subframes in each region are configured in the same manner as the frames defined in the IEEE 802.16 standard as shown in FIG. Also good.

  FIG. 12 illustrates a synchronization channel of a downlink subframe of the multi-hop relay broadband wireless access communication system according to the embodiment of the present invention.

  As shown in FIG. 12, the downlink subframe 1200 is divided into a first area 1201, a second area 1203, and a third area 1205 by time multiplexing.

  At this time, the frame 1210 of the base station includes the first area 1201 including a synchronization channel, a control channel, and a downlink burst for terminals included in the service area. That is, the base station positions a synchronization channel for the terminal in a preamble form at the front end of the first region 1201.

  If the base station uses the second region 1203, the frame 1210 of the base station configures the second region 1203 with a downlink burst.

  The base station frame 1210 comprises a third region 1205 with a control channel, a downlink burst, and a synchronization channel for the one-hop relay station. That is, the base station positions a synchronization channel for the one-hop relay station in a postamble form at the rear end of the third area 1205.

  Next, the frame 1220 of the first group relay station includes a first area 1201 including a synchronization channel, a control channel, and a downlink burst for terminals included in the service area. That is, the first group relay station positions a synchronization channel for the terminal in the form of a preamble at the front end of the first area 1201.

  The frame 1220 of the first group relay station configures the second region 1203 with a control channel, a downlink burst, and a synchronization channel for the next hop relay station included in the second group. That is, the first group relay station positions a synchronization channel for the next hop relay station included in the second group in a postamble form at the rear end of the second area 1203.

  At this time, the first group relay station receives a downlink subframe from the previous hop relay station or the base station during the third region 1205.

  Next, in the frame 1230 of the second group relay station, the first area 1201 is configured with a synchronization channel, a control channel, and a downlink burst for terminals included in the service area. That is, the second group relay station positions a synchronization channel for the terminal in the form of a preamble at the front end of the first area 1201.

  The frame 1230 of the second group relay station configures a third region 1205 with a control channel, a downlink burst, and a synchronization channel for the next hop relay station included in the first group. That is, the second group relay station positions a synchronization channel for the next hop relay station included in the first group in a postamble form at the rear end of the third area 1205.

  At this time, the second group relay station receives a downlink subframe from the previous hop relay station during the second region 1203.

  FIG. 13 shows a downlink subframe structure of a multi-hop relay broadband wireless access communication system according to another embodiment of the present invention.

  As shown in FIG. 13, the downlink subframe is divided into a first area 1301, a second area 1303, and a third area 1305 that are time multiplexed.

  First, the base station frame 1310 constitutes a downlink subframe to be transmitted to terminals included in the base station service area in the first area 1301 and the third area 1305. Here, the base station may configure the third area 1305 with a null in order to eliminate interference between the terminal and the relay station. At this time, the base station positions a synchronization channel in a preamble form at the front end of the first area 1301.

  The base station frame 1310 constitutes a downlink subframe to be transmitted to the 1-hop relay station included in the first group during the second region 1303. Here, the base station positions a synchronization channel for the one-hop relay station in a postamble form at the rear end of the second region 1303.

  At this time, since the RTG that is a time protection region exists between the second region 1303 and the third region 1305 of the frame 1320 of the first group relay station, the base station performs the one-hop relay. A synchronization channel for the station is transmitted to the one-hop relay station during the period before the RTG in the second region 1303.

  Next, the relay station frame 1320 included in the first group constitutes a downlink subframe to be transmitted to the terminals included in the service area of the first group relay station between the first areas 1301. At this time, the first group relay station positions a synchronization channel for the terminal in the form of a preamble at the front end of the first region 1301.

  The frame 1320 of the first group relay station receives a downlink subframe transmitted by a previous hop relay station included in the second group during the second region 1303. If the first group relay station is a 1-hop relay station, the 1-hop relay station receives a downlink subframe transmitted by the base station during the second region 1303.

  The frame 1320 of the first group relay station constitutes a downlink subframe to be transmitted to the next hop relay station included in the second group during the third region 1305.

  Here, the first group relay station locates a synchronization channel for the next hop relay station included in the second group in a postamble form at the rear end of the third region 1305.

  At this time, a TTG that is a time protection region for switching operation of the relay station exists between the first region 1301 and the second region 1303 of the frame 1320 of the first group relay station. Further, between the second area 1303 and the third area 1305 of the frame 1320 of the first group relay station, there is an RTG that is a time protection area for switching the operation of the relay station.

  Next, the frame 1330 of the second group relay station constitutes a downlink subframe to be transmitted to terminals included in the service area during the first area 1301. At this time, the second group relay station positions a synchronization channel for the terminal in the form of a preamble at the front end of the first area 1301.

  The frame 1330 of the second group relay station constitutes a downlink subframe that is transmitted to the next hop relay station included in the first group during the second region 1303.

  At this time, the second group relay station positions a synchronization channel for the next hop relay station included in the first group in a postamble form at the rear end of the second area 1303.

  The second group relay station frame 1330 receives a downlink subframe transmitted by the previous hop relay station included in the first group during the third region 1305.

  Although not shown, when a terminal hop relay station is included in the first group, the terminal hop relay station is included in the service area of the relay station in the first area 1301 and the third area 1305. A downlink subframe to be transmitted to the terminal to be transmitted. Here, the terminal hop relay station may configure the third region 1305 with a null in order to eliminate interference between the terminal and the relay station.

  The terminal hop relay station receives a downlink subframe from a previous hop relay station included in the second group during the second region 1303.

  If the terminal hop relay station is included in the second group, the first region 1301 and the second region 1303 form a downlink subframe to be transmitted to a terminal included in the service region. Here, the terminal hop relay station may configure the second region 1303 with a null in order to eliminate interference between the terminal and the relay station.

  The terminal hop relay station receives a downlink subframe from a previous hop relay station included in the first group during the third region 1305.

  In the broadband wireless access communication system, when a frame is configured as shown in FIG. 13, the subframes in each region are configured in the same manner as the frame defined in the IEEE 802.16 standard as shown in FIG. Also good.

  FIG. 14 shows a synchronization channel of a downlink subframe in a multi-hop relay broadband wireless access communication system according to another embodiment of the present invention.

  As shown in FIG. 14, the downlink subframe 1400 is divided into a first area 1401, a second area 1403, and a third area 1405 by time multiplexing.

  At this time, the frame 1410 of the base station comprises the first area 1401 with a synchronization channel, a control channel, and a downlink burst for terminals included in the service area. That is, the base station positions a synchronization channel for the terminal in a preamble form at the front end of the first region 1401.

  If the base station uses the third region 1405, the frame 1410 of the base station configures the third region 1405 with a downlink burst.

  The base station frame 1410 comprises a second region 1403 with a control channel, a downlink burst, and a synchronization channel for the one-hop relay station. At this time, the base station positions a synchronization channel for the one-hop relay station in a postamble form at the rear end of the second area 1403.

  Next, in the first group relay station frame 1420, the first area 1401 includes a synchronization channel, a control channel, and a downlink burst for terminals included in the service area. That is, the first group relay station locates a synchronization channel for the terminal in a preamble form at the front end of the first area 1401.

  The frame 1420 of the first group relay station configures a third area 1405 with a control channel, a downlink burst, and a synchronization channel for the next hop relay station included in the second group. That is, the first group relay station positions a synchronization channel for the next hop relay station included in the second group in a postamble form at the rear end of the third area 1405.

  At this time, the first group relay station receives a downlink subframe from the previous hop relay station or the base station during the second region 1403.

  Next, in the second group relay station frame 1430, the first area 1401 includes a synchronization channel, a control channel, and a downlink burst for terminals included in the service area. That is, the second group relay station positions a synchronization channel for the terminal in the form of a preamble at the front end of the first area 1401.

  The frame 2430 of the second group relay station configures the second region 1403 with a control channel, a downlink burst, and a synchronization channel for the next hop relay station included in the first group. That is, the second group relay station positions a synchronization channel for the next hop relay station included in the first group in a postamble form at the rear end of the second area 1403.

  At this time, the second group relay station receives a downlink subframe from the previous hop relay station during the third region 1405.

  Next, in the broadband wireless access communication system, the uplink subframe is configured as shown in FIG. 15 or FIG.

  FIG. 15 illustrates an uplink subframe structure of a multi-hop relay broadband wireless access communication system according to an embodiment of the present invention.

  As shown in FIG. 15, the uplink subframe is divided into a first area 1501, a second area 1503, and a third area 1505 by time multiplexing.

  First, the base station frame 1510 receives uplink subframes transmitted by terminals included in the service area in the first area 1501 and the second area 1503. Here, the base station may configure the second region 1503 with a null in order to eliminate interference between the terminal and the relay station.

  Thereafter, the frame 1510 of the base station receives an uplink subframe from the 1-hop relay station included in the first group during the third region 1505.

  Next, the first group relay station frame 1520 receives an uplink subframe from terminals included in the service area during the first area 1501.

  The frames 1520 and 1540 of the first group relay station receive uplink subframes from the next hop relay station included in the second group during the second region 1503. For example, the relay station 1520 included in the first group receives an uplink subframe from the second joint relay station 1530. Further, the 3-hop relay station 1540 included in the first group receives an uplink subframe from the 4-hop relay station included in the second group.

  The frames 1520 and 1540 of the first group relay station constitute uplink subframes to be transmitted to the previous hop relay station included in the second group during the third region 1505. If the first group relay station is a 1-hop relay station, the 1-hop relay station configures an uplink subframe to be transmitted to the base station during the third region 1505.

  At this time, an RTG, which is a time protection region for switching operation of the relay station, exists between the second region 1503 and the third region 1505 of the subframe 1520 of the first group relay station.

  Next, the second group relay station frame 1530 receives uplink subframes from terminals included in the service area during the first area 1501.

  The frame 1530 of the second group relay station constitutes an uplink subframe to be transmitted to the previous hop relay station included in the first group during the second region 1503.

  The second group relay station frame 1530 receives an uplink subframe transmitted by the next hop relay station included in the first group during the third region 1505.

  At this time, between the first area 1501 and the second area 1503 of the frame 1530 of the second group relay station, there is an RTG that is a time protection area for changing the operation of the second relay station. . In addition, between the second area 1503 and the third area 1505 of the frame 1530 of the second group relay station, there is a TTG that is a time protection area for switching the operation of the relay station.

  Although not shown in the figure, when the terminal hop relay station is included in the first group, the relay station transmits an uplink transmitted by a terminal included in the service area in the first area 1501 and the second area 1503. A link subframe is received. Here, the relay station may configure the second area 1503 with a null in order to eliminate interference between the terminal and the relay station.

  In addition, the relay station configures an uplink subframe to be transmitted to the previous hop relay station included in the second group during the third region 1505.

  If the terminal hop relay station is included in the second group, the relay station transmits uplink subframes transmitted by terminals included in the service area in the first area 1501 and the third area 1505. Receive. Here, the relay station may configure the third region 1505 with a null in order to eliminate interference between the terminal and the relay station.

  In addition, the relay station configures an uplink subframe to be transmitted to the previous hop relay station included in the first group during the second region 1503.

  FIG. 16 illustrates an uplink subframe synchronization channel of a multi-hop relay broadband wireless access communication system according to another embodiment of the present invention.

  As shown in FIG. 16, the downlink subframe is divided into a first area 1601, a second area 1603, and a third area 1605 by time multiplexing.

  First, the base station frame 1610 receives uplink subframes from terminals included in the service area of the base station in the first region 1601 and the third region 1605. Here, the base station may configure the third area 1605 with a null in order to eliminate interference between the terminal and the relay station.

  The base station frame 1610 receives an uplink subframe from a 1-hop relay station included in the first group during the second region 1603.

  Next, frames 1620 and 1640 of the first group relay station receive uplink subframes from terminals included in the service area during the first area 1601.

  The frames 1620 and 1640 of the first group relay station constitute uplink subframes to be transmitted to the previous hop relay station included in the second group during the second region 1603. If the first group relay station is a 1-hop relay station, the relay station configures an uplink subframe to be transmitted to the base station during a second region 1603.

  The first group relay station frame 1620 receives an uplink subframe from the next hop relay station included in the second group during the third region 1605.

  At this time, between the first area 1601 and the second area 1603 of the frame 1620 of the first group relay station, there is an RTG that is a time protection area for changing the operation of the relay station. In addition, between the second area 1603 and the third area 1605 of the frame 1620 of the first group relay station, there is a TTG that is a time protection area for switching the operation of the relay station.

  Next, the second group relay station frame 1630 receives uplink subframes from terminals included in the service area during the first area 1601.

  The second group relay station frame 1630 receives an uplink subframe from the next hop relay station included in the first group during the second region 1603.

  The frame 1630 of the second group relay station constitutes an uplink subframe to be transmitted to the previous hop relay station included in the first group during the third region 1605.

  Although not shown, when a terminal hop relay station is included in the first group, the relay station transmits an uplink transmitted by a terminal included in the service area in the first area 1601 and the third area 1605. Receive subframe. Here, the relay station may configure the third area 1605 with a null in order to eliminate interference between the terminal and the relay station.

  The relay station configures an uplink subframe to be transmitted to a previous hop relay station included in the second group during the second region 1603.

  If the terminal hop relay station is included in the second group, the relay station transmits an uplink substation transmitted by a terminal included in the service area between the first area 1601 and the second area 1603. Receive a frame. Here, the relay station may configure the second area 1603 with a null in order to eliminate interference between the terminal and the relay station.

  In addition, the RS configures an uplink subframe to be transmitted to a previous hop RS included in the first group during the third region 1605.

  Here, in the broadband wireless access communication system, the downlink subframe shown in FIG. 11 and the uplink subframe shown in FIG. 15 or FIG. 16 may be combined to form one frame. . In addition, the broadband wireless access communication system may configure one frame by combining the downlink subframe shown in FIG. 13 and the uplink subframe shown in FIG. 15 or FIG.

  As described above, the base station of the broadband wireless access communication system transmits a synchronization channel for a terminal and a 1-hop relay station according to a frame configuration scheme. In addition, the first group relay station transmits a synchronization channel for a terminal and a next hop relay station included in the second group according to the frame configuration scheme. The second group relay station also transmits a synchronization channel to the terminal and the next hop relay station included in the first group according to the frame configuration scheme.

  At this time, the base station, the first group relay station, and the second group relay station of the broadband wireless access communication system either transmit a synchronization channel for each frame or a fixed frame for each predetermined period. Transmit at intervals. In addition, the base station, the first group relay station, and the second group relay station may transmit the synchronization channel including the synchronization channel using a frame that determines the synchronization channel according to a control signal. Here, the control signal includes FCH (Frame Control Header), MAP, and DCD (Downlink Channel Descriptor).

  In the following description, operation procedures of the base station, the relay station 1, the relay station 2, and the terminal for performing communication using the frame structure configured as described above in the broadband wireless access communication system will be described.

  FIG. 17 shows an operation procedure of the base station in the multi-hop relay broadband wireless access communication system according to the embodiment of the present invention.

  Referring to FIG. 17, first, in step 1701, the base station determines a section of each area for dividing a subframe in order to perform communication according to a channel environment. That is, the base station divides the subframe into an area for a direct link and an area for a relay link. For example, when the broadband wireless access communication system is configured with two hops, the base station divides into a first area for a direct link and a second area for a relay link. If the broadband wireless access communication system is configured with three hops, the base station may include a first area for a direct link, a second area for a relay link, and a third area. Divide into

  After dividing the section for each frame area, the base station proceeds to step 1703 and communicates with a terminal included in the service area during the area for the direct link. At this time, the base station communicates with the relay station 2 during the area for the direct link. Here, the base station positions a synchronization channel for the terminal at the front end of the area for the direct link. For example, when the frame is configured as shown in FIG. 6, 7 or 9, the base station communicates with the terminal during the first region.

  If the subframe of the frame is configured as shown in FIG. 11 or FIG. 15, the base station communicates with the terminal during the first region or the second region. When the subframe of the frame is configured as shown in FIG. 13 or FIG. 16, the base station performs communication with the terminal during the first region or the third region.

  Thereafter, the base station proceeds to step 1705 to communicate with the one-hop relay station during the area for the relay link. Here, in order to provide a synchronous channel to the one-hop relay station, the synchronous channel is located at the rear end of the area for the relay link.

  For example, when the frame is configured as shown in FIG. 6, 7 or 9, the base station communicates with the 1-hop relay station during the second region. At this time, the base station positions a synchronization channel for the one-hop relay station at the rear end of the second region.

  If the subframe of the frame is configured as shown in FIG. 11 or FIG. 15, the base station communicates with the 1-hop relay station during the third region. At this time, the base station positions a synchronization channel for the one-hop relay station at the rear end of the third region.

  When the subframe of the frame is configured as shown in FIG. 13 or FIG. 16, the base station communicates with the one-hop relay station during the second region. At this time, the base station positions a synchronization channel for the one-hop relay station at the rear end of the second region.

  Thereafter, the base station ends the present algorithm.

  FIG. 18 shows an operation procedure of the relay station 1 in the multi-hop relay broadband wireless access communication system according to the embodiment of the present invention.

  Referring to FIG. 18, the relay station 1 confirms subframe configuration information provided from a base station or an upper relay station in step 1801. That is, the relay station 1 checks the configuration information of the subframe area for the direct link and the subframe area for the relay link. For example, when the frame is configured as shown in FIG. 6, FIG. 7, or FIG. 9, the relay station 1 checks the configuration information of the first area and the second area.

  If the subframes of the frame are configured as shown in FIG. 11 or FIG. 13 or FIG. 15 or FIG. 16, the relay station 1 uses the first area, the second area, and the third area. Check each configuration information.

  After confirming the configuration information of the subframe, the relay station 1 proceeds to step 1803 to perform communication with the terminal included in the service area or the relay station 2 during the first area for the direct link. At this time, the relay station 1 positions a synchronization channel for the terminal at the front end of the first area.

  Next, the relay station 1 proceeds to step 1805 to perform communication with the base station or the multi-hop relay station via the area for the relay link. At this time, the relay station positions a synchronization channel for the lower relay station at the rear end of the area for communicating with the lower relay station. For example, when the frame is configured as shown in FIG. 6, 7 or 9, the relay station 1 communicates with the base station during the second area.

  If the subframe of the frame is configured as shown in FIG. 11 or FIG. 15, the relay station 1 communicates with a lower relay station during the second area, In the meantime, it communicates with the base station or the upper relay station. At this time, the relay station 1 positions a synchronization channel for the lower relay station at the rear end of the second area.

  Also, when the subframes of the frame are configured as shown in FIG. 13 or FIG. 16, the relay station 1 communicates with a lower relay station during the third area, and between the second areas. Communicates with the base station or the upper relay station. At this time, the relay station 1 positions a synchronization channel for the lower relay station at the rear end of the third area.

  Thereafter, the relay station 1 ends the present algorithm.

  FIG. 19 shows an operation procedure of the relay station 2 in the multi-hop relay broadband wireless access communication system according to the embodiment of the present invention.

  Referring to FIG. 19, the relay station 2 confirms the configuration information of the subframe based on the control information provided from the base station in step 1901 and the relay capability of the relay station 2. For example, when the frame is configured as shown in FIG. 7 or FIG. 9, the relay station 2 includes the first and second areas of the subframe, and the relay station 2 and the terminal in the second area. Check the area information for link communication.

  After confirming the subframe configuration information, the relay station 2 proceeds to step 1903 and communicates with the base station in the first area.

  Next, the relay station 2 proceeds to step 1905 and performs communication with a terminal provided with a relay service via the relay station 2 in the second area.

  For example, in the downlink, the relay station 2 receives a signal from the base station in the first region and transmits a signal to a terminal in the second region. In the uplink, a signal is transmitted to the base station in the first region, and a signal is received from the terminal in the second region.

  Thereafter, the relay station 2 ends the present algorithm.

  FIG. 20 shows an operation procedure of the terminal in the multi-hop relay broadband wireless access communication system according to the embodiment of the present invention.

  Referring to FIG. 20, first, in step 2001, the terminal performs communication with the base station or the relay station 1 in the first area.

  Thereafter, the terminal proceeds to Step 2003 and performs communication with the relay station 2 in the second area. For example, in the downlink, the terminal receives a signal from the base station or the relay station 1 in the first area, and receives a signal from the relay station 2 in the second area. In the uplink, a signal is transmitted to the base station or relay station 1 in the first area, and a signal is transmitted to the relay station 2 in the second area.

  Thereafter, the terminal ends the present algorithm.

  In the above-described embodiment, the time division duplex system is configured by, for example, dividing the unidirectional subframe into a first area and a second area by time multiplexing. As another embodiment, in the frequency division duplex system, the unidirectional subframe is divided into a first region and a second region or a third region by frequency division multiplexing. At this time, the downlink subframe and the uplink subframe of the frequency division duplex system are simultaneously transmitted and received via different frequency bands.

  Hereinafter, a block configuration of a base station and a relay station for providing a relay service in the broadband wireless access communication system will be described. Here, since the base station and the relay station have the same block configuration, the block configuration of the base station and the relay station will be described using the base station block of FIG. In addition, the base station and the relay station will be described as an example in which signals are transmitted and received using one transmission / reception device.

  FIG. 21 shows a block configuration of a base station in a multi-hop relay broadband wireless access communication system according to the present invention.

  First, the configuration of the base station will be described with reference to FIG.

  The base station includes a transmission apparatus 2101, a reception apparatus 2103, a timing controller 2105, and an RF switch 2107.

  The transmission apparatus 2101 includes a frame generator 2109, a resource mapper 2111, a modulator 2113, and a digital / analog converter (Digital / Analog Converter) 2115.

  The frame generator 2109 forms subframes for transmitting a synchronization channel, a control channel, and a traffic burst to terminals and lower relay stations included in the service area of the base station under the control of the timing controller 2105. At this time, the frame generator 2109 positions a synchronization channel at the front end of the subframe for transmission to the terminal and the rear end of the subframe for transmission to the lower relay station.

  For example, when the broadband wireless access communication system is configured with two hops, the frame generator 2109 transmits a subframe to be transmitted to the terminal or the relay station 2 during a first region of a downlink subframe. Configure. Further, the frame generator 2109 positions a synchronization channel at the rear end of the subframe configured between the front end of the subframe and the second region for transmission to the 1-hop relay station during the second region. .

  If the broadband wireless access communication system is configured with three or more hops, the frame generator 2109 may include the first region of the downlink subframe, or the first region and the second region. The subframe for transmitting to the terminal or the relay station 2 is configured. Thereafter, the frame generator 2109 configures a subframe for transmission to the 1-hop relay station during a third region.

  At this time, the frame generator 2109 positions the synchronization channel at the front end of the subframe configured between the first regions and the rear end of the subframe configured between the third regions.

  The resource mapper 2111 assigns each subframe provided from the frame generator 2109 to a burst of the link and outputs the subframe.

  The modulator 2113 modulates the subframe assigned to the burst of each link provided from the resource mapper 2111 according to the modulation level and outputs the modulated subframe.

  The digital / analog converter 2115 converts the modulated digital signal provided from the modulator 2113 into an analog signal and outputs the analog signal to the RF switch 2107.

  The receiving apparatus 2103 includes an analog / digital converter 2117, a demodulator 2119, a resource demapping unit 2121, and a frame extractor 2123.

  The analog / digital converter 2117 converts an analog signal received via the RF switch 2107 into a digital signal.

  The demodulator 2119 demodulates and outputs the digital signal provided from the analog / digital converter 2117 according to the demodulation method.

  The resource demapping unit 2121 extracts an actual subframe allocated to the burst of each link provided from the demodulator 2119.

  The frame extractor 2123 extracts a subframe corresponding to the base station from the subframes provided from the resource demapping unit 2121.

  The RF switch 2107 connects a signal to be transmitted / received to / from the terminal, the relay station 1 and the relay station 2 to the transmitter 2101 and the receiver 2103 under the control of the timing controller 2105.

  The timing controller 2105 controls transmission / reception timing for the base station to communicate with a terminal and a lower relay station according to a frame configuration method.

  Next, the configuration of the relay station 1 will be described with reference to FIG.

  The relay station 1 includes a transmission device 2101, a reception device 2103, a timing controller 2105, and an RF switch 2107.

  The transmission apparatus 2101 includes a frame generator 2109, a resource mapper 2111, a modulator 2113, and a digital / analog converter 2115.

  The frame generator 2109 forms a downlink subframe for transmitting a synchronization channel, a control channel, and a traffic burst to terminals included in the service area of the relay station 1 and lower relay stations under the control of the timing controller 2105. To do. At this time, the frame generator 2109 positions a synchronization channel at the front end of the subframe transmitted to the terminal and the rear end of the subframe transmitted to the lower relay station.

  The frame generator 2109 constitutes an uplink subframe for communicating with a base station or a higher relay station.

  The resource mapper 2111 assigns each subframe provided from the frame generator 2109 to a burst of the link and outputs the subframe.

  The modulator 2113 modulates the subframe assigned to the burst of each link provided from the resource mapper 2111 according to the modulation scheme.

  The digital / analog converter 2115 converts the modulated digital signal provided from the modulator 2113 into an analog signal and outputs the analog signal to the RF switch 2107.

  The receiving apparatus 2103 includes an analog / digital converter 2117, a demodulator 2119, a resource demapping unit 2121, and a frame extractor 2123.

  The analog / digital converter 2117 converts the analog signal received via the RF switch 2107 into a digital signal.

  The demodulator 2119 demodulates and outputs the digital signal provided from the analog / digital converter 2117 using the demodulation method.

  The resource demapping unit 2121 extracts an actual subframe allocated to the burst of each link provided from the demodulator 2119.

  The frame extractor 2123 extracts a subframe corresponding to the base station from the subframes provided from the resource demapping unit 2121.

  The RF switch 2107 connects signals transmitted to and received from the base station, terminal, lower relay station, and upper relay station to the transmitter 2101 and the receiver 2103 under the control of the timing controller 2105.

  The timing controller 2105 controls transmission / reception timing for the relay station 1 to communicate with a base station, a terminal, a lower relay station, and a higher relay station according to a frame configuration method.

  Finally, the configuration of the relay station 2 will be described with reference to FIG.

  The relay station 2 includes a transmission device 2101, a reception device 2103, a timing controller 2105, and an RF switch 2107.

  The transmission apparatus 2101 includes a frame generator 2109, a resource mapper 2111, a modulator 2113, and a digital / analog converter 2115.

  The frame generator 2109 configures a subframe to be transmitted to terminals connected by a relay link and a subframe to be transmitted to the base station under the control of the timing controller 2105. For example, the frame generator 2109 configures a subframe for transmission to the terminal during a second region of the downlink subframe, and the base station in the first region of the uplink subframe. A subframe for transmitting to is configured.

  The resource mapper 2111 assigns each subframe provided from the frame generator 2109 to a burst of the link and outputs the subframe.

  The modulator 2113 modulates the subframe assigned to the burst of each link provided from the resource mapper 2111 according to the modulation scheme.

  The digital / analog converter 2115 converts the modulated digital signal provided from the modulator 2113 into an analog signal and outputs the analog signal to the RF switch 2107.

  The receiving apparatus 2103 includes an analog / digital converter 2117, a demodulator 2119, a resource demapping unit 2121, and a frame extractor 2123.

  The analog / digital converter 2117 converts an analog signal received via the RF switch 2107 into a digital signal.

  The demodulator 2119 demodulates and outputs the digital signal provided from the analog / digital converter 2117 using the demodulation method.

  The resource demapping unit 2121 extracts an actual subframe allocated to the burst of each link provided from the demodulator 2119.

  The frame extractor 2123 extracts a subframe corresponding to the base station from the subframes provided from the resource demapping unit 2121.

  The RF switch 2107 connects signals transmitted to and received from the terminal and the base station to the transmitter 2101 and the receiver 2103 under the control of the timing controller 2105.

  The timing controller 2105 controls transmission / reception timings of a first area communicating with the base station and a second area communicating with the terminal.

  The above-described preferred embodiments of the present invention are disclosed for the purpose of illustration, and those having ordinary knowledge in the technical field to which the present invention belongs do not depart from the technical idea of the present invention. Various substitutions, modifications, and alterations are possible within the scope, and such substitutions, alterations, and the like belong to the scope of the claims.

The figure which shows the structure which provides a service using a multihop relay system in a general broadband wireless access communication system. 1 is a diagram illustrating a frame structure for a general IEEE 802.16 system. FIG. The figure which shows the frame structure of the broadband wireless access communication system of a multihop relay system by a prior art. The figure which shows the movement of the relay station in the broadband wireless access communication system of a multihop relay system by a prior art. The figure which shows the flow of the signal which provides a relay service in the relay station 2 in the broadband wireless access communication system of a multihop relay system by a prior art. The figure which shows the frame structure for providing the synchronous channel synchronized with the terminal or relay station in the broadband wireless access communication system of a multihop relay system which concerns on embodiment of this invention. 1 is a diagram showing a frame structure of a multi-hop relay broadband wireless access communication system according to a first embodiment of the present invention. The figure which shows the transmission / reception timing of the signal by the frame structure in the broadband wireless access communication system of a multihop relay system which concerns on embodiment of this invention. The figure which shows the frame structure of the broadband wireless access communication system of the multihop relay system which concerns on the 2nd Embodiment of this invention. The figure which shows the structure of the broadband wireless access communication system of a multihop relay system by this invention. The figure which shows the downlink sub-frame structure of the broadband wireless access communication system of a multihop relay system which concerns on embodiment of this invention. The figure which shows the synchronization channel of the downlink sub-frame of the broadband wireless access communication system of a multihop relay system which concerns on embodiment of this invention. The figure which shows the downlink sub-frame structure of the broadband wireless access communication system of a multihop relay system which concerns on other embodiment of this invention. The figure which shows the synchronization channel of the downlink sub-frame of the broadband wireless access communication system of a multihop relay system which concerns on other embodiment of this invention. The figure which shows the uplink sub-frame structure of the broadband wireless access communication system of a multihop relay system which concerns on embodiment of this invention. The figure which shows the synchronization channel of the uplink sub-frame of the broadband wireless access communication system of a multihop relay system which concerns on other embodiment of this invention. The figure which shows the operation | movement procedure of the base station in the broadband wireless access communication system of a multihop relay system which concerns on embodiment of this invention. The figure which shows the operation | movement procedure of the relay station 1 in the broadband wireless access communication system of a multihop relay system which concerns on embodiment of this invention. The figure which shows the operation | movement procedure of the relay station 2 in the broadband wireless access communication system of a multihop relay system which concerns on embodiment of this invention. The figure which shows the operation | movement procedure of the terminal in the broadband wireless access communication system of a multihop relay system which concerns on embodiment of this invention. The figure which shows the block configuration of the base station in the broadband wireless access communication system of the multihop relay system which concerns on this invention.

Claims (70)

During the first period of the subframe, the subframe for the link between the base station and the terminal, the subframe for the link between the first relay station and the terminal that provides the synchronization channel, the synchronization channel for the base station and the terminal Configuring at least one of the subframes for the second relay station link not to,
During the second period of the subframe, the subframe for the link between the base station and the first relay station, the subframe for the link between the relay station and the relay station, the second relay station and the terminal Configuring at least one of the subframes for the link;
A subframe configuration method for supporting a relay service in a wireless communication system.   The method of claim 1, wherein the first and second intervals of the subframe are divided by time division or frequency division.   The method of claim 1, wherein the first and second sections of the subframe have a fixed size or a variable size according to a channel environment.   The method of claim 1, wherein a synchronization channel is located at a front end of the first interval and a rear end of the second interval of a downlink subframe.   The method of claim 1, wherein a connection channel (ranging) is positioned at a front end of the first section and a rear end of the second section of an uplink subframe.   The method of claim 1, wherein the subframes included in the first section are divided using any one of frequency division multiple access, space division multiple access, and orthogonal frequency division multiple access.   A subframe for the link between the base station and the terminal in the first section, a subframe for a link between the base station and the second relay station, and a link between the first relay station and the terminal The method of claim 1, wherein the subframes have the same structure.   If the second relay station is a subordinate relay station of the first relay station, a subframe for a link between the first relay station and the second relay station is provided during the first interval. The method of claim 1, further comprising the step of configuring.   The second section includes a subframe for a link between the base station and the first relay station, a subframe for a link between the second relay station and the terminal, at least one relay station and a relay station The method of claim 1, comprising at least one of the subframes for the links.   The downlink subframe in which a higher relay station transmits a signal to a lower relay station in a subframe for a link between the relay station and the relay station has a synchronization channel located at a rear end thereof. Item 10. The method according to Item 9.   The subframe included in the second section is divided using any one of frequency division multiple access, space division multiple access, and orthogonal frequency division multiple access. Method. Configuring a subframe for a link between a base station and a terminal and a subframe for a link between a relay station and a terminal during a first interval of a downlink subframe;
During the second interval of the downlink subframe, a first group of relay stations, which is a set of odd hop relay stations, and a next hop included in a second group, which is a set of even hop relay stations Configuring a subframe for the link of the relay station;
During the third period of the downlink subframe, a subframe for the link between the base station and the one-hop relay station, the second group of relay stations, and the next hop included in the first group Configuring a subframe for the link of the relay station;
A method for constructing a downlink subframe in a wireless communication system, comprising:   The method of claim 12, wherein the first interval, the second interval, and the third interval of the subframe are divided according to time.   The subframe for the link between the base station and the terminal in the first section and the subframe for the link between the relay station and the terminal include a synchronization channel at a front end, respectively. the method of.   The subframe for a link between the relay station of the first group and the next hop relay station included in the second group in the second section includes a synchronization channel at a rear end. 12. The method according to 12.   The method of claim 15, wherein the synchronization channel is located at a front end of a time protection region existing between the second interval and the third interval.   The method of claim 15, wherein the synchronization channel is included every frame or every predetermined frame.   The method of claim 17, wherein the predetermined frame is determined by a preset period or a control signal.   A subframe for a link between the base station and the one-hop relay station in the third section, and a subframe for a link between the second group of relay stations and the next hop relay station included in the first group The method of claim 12, wherein the frame includes a synchronization channel at the trailing edge.   The method of claim 19, wherein the synchronization channel is included every frame or every predetermined frame.   The method of claim 20, wherein the predetermined frame is determined by a preset period or a control signal. Forming a subframe for the link between the base station and the terminal and a subframe for the link between the terminal hop relay station and the terminal included in the first group during the second interval; ,
Configuring a subframe for a link between a terminal hop relay station and a terminal included in the second group during the third period;
The method of claim 12, further comprising: Configuring a subframe for a link between a base station and a terminal and a subframe for a link between a relay station and a terminal during a first interval of a downlink subframe;
During the second interval of the downlink subframe, a subframe for the link between the base station and the 1-hop relay station, a second group of relay stations that is a set of even-hop relay stations, and an odd number Configuring a subframe for a link of a next hop relay station included in a first group that is a set of hop relay stations;
Configuring a subframe for a link between the first group of relay stations and a next hop relay station included in a second group during a third interval of the downlink subframe;
A method for constructing a downlink subframe in a wireless communication system, comprising:   The method of claim 23, wherein the first section, the second section, and the third section of the subframe are divided by time division.   24. The subframe for the link between the base station and the terminal and the subframe for the link between the relay station and the terminal in the first section include a synchronization channel at a front end, respectively. The method described.   A subframe for a link between the base station and the one-hop relay station in the second section, and a subframe for a link between the second group of relay stations and the next hop relay station included in the first group The method of claim 23, wherein the frame includes a synchronization channel at a rear end.   The method of claim 26, wherein the synchronization channel is located at a front end of a time protection region existing between the second interval and the third interval.   27. The method of claim 26, wherein the synchronization channel is included every frame or every predetermined frame.   The method according to claim 28, wherein the predetermined frame is determined by a preset period or a control signal.   The subframe for the link between the first group relay station and the next hop relay station included in the second group in the third section includes a synchronization channel at the rear end. The method described in 1.   The method of claim 30, wherein the synchronization channel is included every frame or every predetermined frame.   The method of claim 31, wherein the predetermined frame is determined by a preset period or a control signal. Configuring a subframe for a link between a terminal hop relay station and a terminal included in the second group during the second period;
Forming a subframe for the link between the base station and the terminal and a subframe for the link between the terminal hop relay station and the terminal included in the first group during the third interval; 24. The method of claim 23, further comprising: Configuring a subframe for the link between the terminal and the base station and a subframe for the link between the terminal and the relay station during the first interval of the uplink subframe;
During the second interval of the uplink subframe, a second group of relay stations that is a set of even hop relay stations and a previous hop that is included in the first group that is a set of odd hop relay stations Configuring a subframe for the link of the relay station;
During the third period of the uplink subframe, a subframe for a link between a 1-hop relay station and a base station, a previous hop relay included in the first group of relay stations and the second group Configuring subframes for station links; and
An uplink subframe configuration method in a wireless communication system, comprising:   The method of claim 34, wherein the first section, the second section, and the third section of the subframe are divided by time division. Forming a subframe for a link between a terminal and a base station during the second interval, and a subframe for a link between a terminal and a terminal hop relay station included in the first group;
Configuring a subframe for a link between a terminal and a terminal hop relay station included in the second group during the third period;
35. The method of claim 34, further comprising: Configuring a subframe for the link between the terminal and the base station and a subframe for the link between the terminal and the relay station during the first interval of the uplink subframe;
During the second period of the uplink subframe, a subframe for a link between a 1-hop relay station and a base station, a first group of relay stations and an even-hop relay that is a set of odd-hop relay stations Configuring a subframe for a link of a previous hop relay station included in a second group of stations,
Configuring a subframe for a link between the second group of relay stations and a previous hop relay station included in the first group during a third period of the uplink subframe;
An uplink subframe configuration method in a wireless communication system, comprising:   The method of claim 37, wherein the first section, the second section, and the third section of the subframe are divided by time division. Configuring a subframe for a link between a terminal and a terminal hop relay station included in the second group during the second period;
Configuring a subframe for a link between a terminal and a base station and a subframe for a link between a terminal and a terminal hop relay station included in the first group during the third period;
38. The method of claim 37, further comprising: Allocating resources for a first interval for communicating with a terminal or a second relay station that does not provide a synchronization channel and a second interval for communicating with a first relay station that provides a synchronization channel;
After allocating the resource, using the first interval to communicate with the terminal or the second relay station;
Using the second section to communicate with the first relay station;
A method of operating a base station in a wireless communication system, comprising:   The method of claim 40, wherein the first and second intervals have a fixed size or a variable size according to a channel environment.   The method of claim 40, wherein a synchronization channel is located at a front end of the first period and a rear end of the second period of a downlink subframe.   The method according to claim 40, wherein a connection channel (ranging) is positioned at a front end of the first interval and a rear end of the second interval of a downlink subframe.   The method of claim 40, wherein the first interval and the second interval are divided by time division or frequency division.   The method of claim 40, further comprising: allocating resources by dividing the second interval into a number of intervals when the relay station is configured with multi-hop. A first interval for communicating with a terminal using control information received from an upper node, and a second interval for communicating with the upper node or a lower relay station for relay service The setting process,
Communicating with the terminal using the first interval;
Using the second section to communicate with the upper node or the lower relay station;
A method for operating a relay station for providing a synchronization channel in a wireless communication system.   The method of claim 46, wherein the first and second intervals have a fixed size or a variable size according to a channel environment.   The method of claim 46, wherein the first interval and the second interval are divided by time division or frequency division.   The method according to claim 46, wherein the upper node is the base station or an upper relay station.   The method of claim 46, further comprising performing communication with a relay station that does not provide a synchronization channel using the first interval. The process of communicating using the second section is as follows:
When the wireless communication system is configured with at least three hops, a process of confirming area information obtained by dividing the second section using the control information;
Communicating with the lower relay station through the first area of the second section;
Communicating with the upper node through a second area of the second interval;
47. The method of claim 46, comprising:   52. The method of claim 51, wherein a synchronization channel is located at a rear end of the first region. The process of communicating using the second section is as follows:
When the wireless communication system is configured with at least three hops, a process of confirming area information obtained by dividing the second section using the control information;
Communicating with the upper node through the first region of the second section;
Communicating with the lower relay station through a second area of the second interval;
47. The method of claim 46, comprising:   54. The method of claim 53, wherein a synchronization channel is located at a rear end of the second region. Setting a first interval for communicating with the upper node using control information received from the upper node and a second interval for communicating with the terminal;
Using the first section to communicate with the upper node;
Communicating with the terminal using the second interval;
A method of operating a relay station that does not provide a synchronization channel in a wireless communication system.   The method of claim 55, wherein the first and second intervals have a fixed size or a variable size according to a channel environment.   56. The method of claim 55, wherein the first interval and the second interval are divided by time division or frequency division.   The method according to claim 55, wherein the upper node is a base station or an upper relay station. It is divided into a first section for performing communication with a terminal or a second relay station that does not provide a synchronization channel, and a second section for performing communication with a first relay station that provides a synchronization channel. A timing controller for providing a signal transmission / reception timing signal by a subframe configuration;
A transmitter for forming and transmitting a first interval signal or a second interval signal by the timing signal;
A receiver that receives the signal of the first section or the signal of the second section by the timing signal and restores the data;
A base station apparatus in a wireless communication system. The transmitter is
During the first interval, form and transmit a signal for transmission to the terminal or the second relay station,
60. The apparatus of claim 59, wherein during the second interval, a signal for transmission to the first relay station is formed and transmitted. The transmitter is
60. The apparatus of claim 59, wherein synchronization channels are located at a front end of the first section and a rear end of the second section. The receiver
Receiving signals from the terminal or the second relay station during the first interval;
60. The apparatus of claim 59, wherein a signal is received from the first relay station during the second interval. Signal transmission / reception timing by a subframe configuration divided into a first section for performing communication with a terminal or a second relay station that does not provide a synchronization channel and a second section for performing communication with an upper node. A timing controller that provides the signal;
A transmitter for forming and transmitting a first interval signal or a second interval signal by the timing signal;
A receiver that receives the signal of the first section or the signal of the second section by the timing signal and restores the data;
A relay station apparatus for providing a synchronization channel in a wireless communication system. The transmitter is
Forming and transmitting a signal for transmission to the terminal or the second relay station during the first period of a downlink subframe;
64. The apparatus of claim 63, wherein the apparatus forms and transmits a signal for transmission to the upper node during the second period of an uplink subframe. The receiver
Receiving a signal from the terminal or a second relay station during the first period of an uplink subframe;
64. The apparatus of claim 63, wherein a signal is received from the upper node during the second interval of a downlink subframe.   64. The apparatus of claim 63, wherein the upper node is a base station or an upper relay station. A timing controller that provides a signal transmission / reception timing signal by a subframe configuration divided into a first section for communicating with a higher-order node and a second section for communicating with a terminal;
A transmitter for forming and transmitting a first interval signal or a second interval signal by the timing signal;
A receiver that receives the signal of the first section or the signal of the second section by the timing signal and restores the data;
A relay station apparatus that does not provide a synchronization channel in a wireless communication system. The transmitter is
During the first period of the uplink subframe, a signal for transmission to the upper node is formed and transmitted.
68. The apparatus of claim 67, wherein during the second period of a downlink subframe, a signal for transmission to the upper node is formed and transmitted. The receiver
Receiving a signal from the upper node during the first interval of a downlink subframe;
68. The apparatus of claim 67, wherein a signal is received from the terminal during the second period of an uplink subframe.   68. The apparatus of claim 67, wherein the upper node is a base station or an upper relay station.

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