KR20070090715A - 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 broadband wireless access communication system, comprising: dividing a signal transmission interval into an end link region that a terminal needs to recognize and an intermediate link region that does not need the terminal's recognition And time division multiplexing the termination link region and the intermediate link region into two time slots within a subframe interval of signal transmission, and during a first interval of the subframe, the base station or the relay station A synchronous frame type including a step of configuring an end link subframe for performing communication, and a step of configuring an intermediate link subframe in which the base station or the terminal communicates with a relay station during a second period of the subframe. By providing the service transparently, handover and synchronization according to the mobility of the terminal can be Or less and, can be configured independently of the intermediate subframe to the end subframe has the advantage to increase the degree of freedom of the intermediate link.

Description

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

1 is a diagram illustrating a structure for providing a service using a multi-hop relay method in a general broadband wireless access communication system;

2 is a diagram illustrating a TDD frame structure of a general broadband wireless access communication system;

3 is a diagram illustrating a TDD frame structure of a multi-hop relay broadband wireless access communication system according to the prior art;

4 is a diagram illustrating transmission and reception timing of a terminal in a multi-hop relay broadband wireless access communication system according to the prior art;

5 is a diagram illustrating a signal flow according to movement of a terminal in a multi-hop relay broadband wireless access communication system according to the prior art;

6 is a diagram illustrating a subframe configuration of a multi-hop relay broadband wireless access communication system according to the present invention;

7 is a diagram showing a frame configuration in a multi-hop relay broadband wireless access communication system according to an embodiment of the present invention;

8 is a diagram illustrating a subframe configuration of a relay link in a multi-hop relay broadband wireless access communication system according to an embodiment of the present invention;

9 is a diagram illustrating timing of a base station, a terminal, and a relay station in a multi-hop relay broadband wireless access communication system according to an embodiment of the present invention;

10 is a diagram illustrating a frame structure in a multi-hop relay broadband wireless access communication system according to another embodiment of the present invention;

11 is a diagram illustrating an operation procedure of a base station in a multi-hop relay broadband wireless access communication system according to an embodiment of the present invention;

12 is a diagram illustrating an operation procedure of a relay station in a multi-hop relay broadband wireless access communication system according to an embodiment of the present invention;

13 is a block diagram of a base station in a multi-hop relay broadband wireless access communication system according to the present invention;

14 is a diagram showing a frame configuration of a broadband wireless access communication system using a three-hop or more relay method according to an embodiment of the present invention;

FIG. 15A is a diagram illustrating a frame configuration of a base station and a first relay station in a broadband wireless access communication system using a three-hop or more relay method according to an embodiment of the present invention; and

15B is a diagram illustrating a frame of a second relay station and a terminal in a broadband wireless access communication system using a three-hop or more relay method according to an exemplary embodiment of the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-hop relay broadband wireless access communication system. In particular, the multi-hop relay broadband wireless access communication system divides signal transmission into an end link region and an intermediate link region for direct link. An apparatus and method for synchronously providing a service and a relay link service.

In the 4th generation communication system, which is the next generation communication system, active research is being conducted to provide individual subscribers with services having various quality of service (Qos) having a transmission speed of about 100Mbps or more. In particular, in the current generation 4 communication system, mobility is provided in a broadband wireless access communication system such as a wireless local area network (LAN) system and a wireless urban area network (MAN) system. Research is being actively conducted to support high-speed services in the form of guaranteeing mobility and service quality.

One of the most important requirements in the fourth generation communication system is self-configurable wireless network configuration. The self-configuring wireless network refers to a wireless network capable of providing a mobile communication service by autonomously or distributedly configuring a wireless network without control of a central system. In general, in the fourth generation communication system, very small radius cells are installed to enable high-speed communication and to accommodate a larger amount of communication. In this case, it is expected that a centralized design using the current wireless network design method is not possible. Accordingly, the fourth generation communication system should be able to actively cope with environmental changes such as the addition of a new base station while being distributedly controlled and constructed. Therefore, the fourth generation communication system requires a self-configuring wireless network.

In order to realistically implement a self-configuring wireless network required in the fourth generation communication system, a technology applied in an ad-hoc network should be introduced into a wireless access communication system. A representative example of this is a multi-hop relay 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 a general broadband wireless access communication system, since a communication is performed through a direct link between a fixed base station and a mobile station, a reliable wireless communication link can be easily configured between the terminal and the base station. have. However, since the location of the base station is fixed, the flexibility of the wireless network configuration is low, and thus, it is difficult to provide an efficient service in a wireless environment in which traffic distribution or call demand is changed.

In order to overcome this disadvantage, it is possible to use a relay service that delivers data in a multi-hop form by using a plurality of neighboring terminals or relay stations. The broadband wireless access communication system using the multi-hop relay method can quickly reconfigure the network in response to changes in the communication environment, and more efficiently operate the entire wireless network. In addition, by providing a relay station between the base station and the terminal to configure a multi-hop relay path through the relay station, it is possible to provide a more excellent radio channel to the terminal. In addition, the multi-hop relay method can provide a higher speed data channel by providing a service through a relay station in a cell boundary region having a poor channel state from a base station, and can expand a cell service area.

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

As illustrated in FIG. 1, the terminals 140, 150, 160, and 170 included in the broadband wireless access communication system using the multi-hop relay method use the base station 100 and the relay stations 110, 120, and 130. Through broadband wireless access service can be provided.

That is, the terminals 140 and 150 included in the service area 110 of the base station 100 communicate with the base station 100 using the direct terminal link L1. In this case, the terminal 2 150 located in the cell boundary region of the base station 100 having a poor channel state communicates by using the relay terminal link L2 of the relay station 2 130, thereby directly connecting to the terminal link L1. Higher data channels can be provided.

In addition, the terminals 160 and 170 located outside the service area 101 of the base station 100 communicate with the base station 100 through the relay terminal link L3 of the relay station 1110. That is, the base station 100 expands the cell area by providing a communication link to the terminals 160 and 170 located outside the service area by 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 having a poor channel state may increase transmission capacity by using the relay terminal link L4 of the relay station 2 120.

As described above, the broadband wireless access communication system is located outside the service area 101 of the base station 100 or relayed through the repeaters 110, 120, and 130 in a shaded area where a shielding phenomenon is severe due to a building or the like. A terminal link is connected to perform communication with the base station. Accordingly, the base station 100 can provide a high-speed data channel by applying a multi-hop relay technique in cell boundary regions and shaded regions with poor channel conditions, and can expand the cell service region.

The relay stations 110, 120, and 130 used in FIG. 1 are divided into relay station 1 (110) used for expanding a cell service area and relay station 2 (120, 130) used for increasing capacity according to operational capabilities. do.

RS 1 110 is used for cell service area extension. That is, the terminals 160 and 170, which are difficult to provide a service directly from the base station because the channel state with the base station 100 is poor, perform synchronization and network entry processes through the relay station 1 (110). Accordingly, the RS 1 110 may transmit the functions required by the terminals 160 and 170 according to an initial connection, that is, a control information channel (or a traffic channel) and a random access channel in a broadcast form. 170).

The relay station 2 (120, 130) relays the service to the terminals 150, 170 located in the cell service area to increase the service capacity. That is, the terminals 150 and 170 located in the extended cell service area receive the control information channel and the random access channel information from the base station 100 or the relay station 1 110 and receive the control information channel and the random access channel information from the relay station 2 120 and 130. A unicast traffic channel is provided.

In a typical broadband wireless access communication system, transmission and reception of information between a base station and a terminal is performed based on a frame as shown in FIG. 2 through a direct link. Here, FIG. 2 shows a frame structure for transmitting and receiving information between the base station and the terminal as an example of a time division duplex frame structure provided by Institute of Electrical and Electronics Engineers (IEEE) 802.11. .

As shown in FIG. 2, the time division duplex frame 200 is divided into a downlink subframe 210 and an uplink subframe 220. In addition, a TTG (Transmit / Receive Transition Gap), which is a guard region, is inserted between the downlink subframe 201 and the uplink subframe 211, and an RTG (Receive / Receive) between the frame and the frame. Transmit Transition Gap) is located.

The downlink subframe 210 includes a preamble and common control information in a fixed slot to broadcast to a cell service area. That is, the terminal included in the service area of the base station can obtain the synchronization and control information by receiving the preamble and the common control channel broadcast from the fixed location.

As described above, the relay station 1 provides the broadband wireless access service to a terminal or relay stations that are located outside the service area of the base station and have difficulty establishing a direct link with the base station. Accordingly, the relay station 1 should provide control information and an initial lasing slot to the terminal or the relay stations so as to perform not only a user traffic service but also a network entry operation. In particular, in order to maintain backward compatibility of the terminal, the relay station 1 must provide a service through a relay link in the same structure as a service through a direct link, as shown in FIG. 3.

In addition, since the RSs transmit a control channel or a traffic channel from the base station or the terminal to provide the relay service, the RSs must perform both transmission and reception operations within a subframe of the unidirectional link. When the transmission and reception operations are simultaneously performed within the unidirectional subframe, the RF isolation problem occurs, and thus the frames are configured to parallel the transmission and reception operations of the RS in time.

3 shows a TDD frame structure of a multi-hop relay broadband wireless access communication system according to the prior art.

As illustrated in FIG. 3, the unidirectional subframes 300 and 310 are divided into regions 301 and 311 for a direct link service and regions 303 and 313 for a relay link service. That is, the relay station allocates a predetermined section of the unidirectional subframes 300 and 310 to regions 303 and 313 for providing the relay service. The relay station receives the information and data for relaying the service through the direct link area.

For example, the relay station 1 receives control information and traffic bursts for relaying from the base station or the terminal in the direct link regions 301 and 311, and then transmits the control information and the traffic burst to the terminal or the base station in the relay link regions 303 and 313. Relay control information and traffic bursts.

In addition, the relay station 2 receives a unicast traffic burst for relaying from a terminal or a base station in the direct link regions 301 and 311 and then transmits the unicast to the terminal or base station in the relay link regions 303 and 313. Relay traffic bursts.

When performing communication using the frame structure as shown in FIG. 3, the broadband wireless access communication system operates asynchronously with different frame timings according to a subject providing the broadband wireless access service as shown in FIG. do.

As shown in FIG. 4, the terminal receiving the direct link service from the base station has the same timing as the BS frame 421 because the terminal performs communication using the direct link region 401. On the other hand, the terminal receiving the relay link service through the relay station has the same timing as the RS frame 423 because the terminal performs communication by using the relay link region 403.

In a typical broadband wireless access communication system, synchronization and handover are performed based on preamble and control information transmitted to a fixed position in a frame. However, as shown in FIG. 4, since the terminals receiving the service operate asynchronously according to the subject providing the broadband wireless access service, when the terminal moves as shown in FIG. Have difficulty

In addition, since the service is provided to the terminal and the relay station simultaneously in the direct link frame or the intermediate link subframe as shown in FIG. 3, there is a problem that the base station has a low degree of freedom with respect to the system configuration for supporting the relay station.

Accordingly, an object of the present invention is to provide a frame configuration method and an apparatus supporting the same for efficiently providing handover and synchronization according to the mobility of a terminal in a multi-hop relay broadband wireless access communication system.

Another object of the present invention is to provide a frame configuration method for increasing the degree of freedom of an intermediate link and a device supporting the same in a multi-hop relay broadband wireless access communication system.

Another object of the present invention is to configure a unidirectional subframe as an end link subframe and an intermediate link subframe in a multi-hop relay broadband wireless access communication system to maintain the direct service and the relay service synchronously, and to freely configure the intermediate link. It is to provide an apparatus and method for increasing the.

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 multi-hop relay broadband wireless access communication system, during the first period of the subframe, the base station or relay station And configuring a subframe for communicating with the terminal and configuring a subframe for the base station or the relay station to communicate with the relay station during the second period of the subframe. .

According to a second aspect of the present invention, an operation method of a base station for supporting a relay service in a multi-hop relay broadband wireless access communication system includes a first section for communicating with a terminal and a second section for communicating with a relay station. Allocating a resource for the resource, and after allocating the resource, communicating with the terminal using the first section, and communicating with the relay station using the second section. It is characterized by.

According to a third aspect of the present invention, a method for operating a relay station for supporting a relay service in a multi-hop relay broadband wireless access communication system includes: performing network entry using control information received from a base station; Receiving control information and a traffic burst for a relay service from the base station or another relay station in a first frame, and transmitting the received control information and traffic burst to a user equipment in an n + 1th frame. Characterized in that.

According to a fourth aspect of the present invention, an apparatus for supporting a relay service in a multi-hop relay broadband wireless access communication system includes transmission and reception timing of a signal for communicating with a terminal and a signal for communicating with a relay station according to a frame configuration method. A timing controller for providing a signal, an RF duplexer for separating the transmission / reception signal, and a transceiver for communicating with the terminal or the relay station according to the timing signal.

According to a fifth aspect of the present invention, a method for configuring a subframe for supporting a relay service in a multi-hop relay broadband wireless access communication system includes performing communication with a terminal at a base station or a relay station during a first period of the subframe. Configuring a subframe to perform a subframe for performing communication between the BS and the RS or the RS during the second period of the subframe, and during the third period of the subframe; And configuring a subframe for the base station and the terminal or the relay station and the relay station to perform communication.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The present invention synchronously provides a direct link service and a relay link service in a multi-hop relay broadband wireless access communication system, and describes a technique for increasing the degree of freedom of relay link configuration. In the following description, a wireless communication system using Time Division Duplex and Orthogonal Frequency Division Multiplexing Access is described as an example, and another multiple access scheme and frequency division duplex are described. The same applies to the communication system based. In addition, it is assumed that relay station 1 relays control information and traffic bursts, and relay station 2 relays only unicast traffic bursts.

In the following description, a link for a terminal to communicate with a base station or a relay station is defined as an end link. Accordingly, the end link includes a terminal and a base station link and a terminal and a relay station link. Here, it is assumed that the subframe for the end link is configured in the same form as the subframe of the Institute of Electrical and Electronics Engineers (IEEE) 802.16 system.

And, except for the terminating link, the link for the relay station to communicate with the base station or another relay station is defined as an intermediate link. Thus, the intermediate link includes a base station and relay station link, and a relay station and relay station link.

In the following description, a unidirectional subframe is divided into an end link subframe and an intermediate link subframe as shown in FIG. 6 to solve a handover problem according to synchronization and mobility of the UE using the direct link service and the relay link service. do.

6 shows a subframe configuration of a multi-hop relay broadband wireless access communication system according to the present invention.

As illustrated in FIG. 6, the unidirectional subframe 600 is divided into a longitudinal link subframe 610 and an intermediate link subframe 620. Here, the end link subframe 610 and the intermediate link subframe 620 are divided into time slots.

When the subframe 600 is the downlink subframe, a time is determined by an end link subframe 610 providing a signal to the terminal and an intermediate link subframe 620 providing a signal to the relay station according to a signal destination. Multiplexed.

In addition, when the subframe 600 is an uplink subframe, the terminal subframe 610 for transmitting a signal and the intermediate link subframe 620 for transmitting a signal according to the signal origin. Time multiplexed.

In FIG. 6, in the end link subframe 610, the base station or relay station transparently performs communication with the terminal. That is, the terminal does not recognize the direct link service and the relay link service to perform communication.

7 illustrates a frame structure in a multi-hop relay broadband wireless access communication system according to an exemplary embodiment of the present invention.

As illustrated in FIG. 7, the downlink subframe 700 and the uplink subframe 710 are time multiplexed into end link subframes 701 and 711 and intermediate link subframes 703 and 713. Here, the intermediate link subframes 703 and 713 may have a fixed length or may dynamically change depending on a cell environment. In addition, since the intermediate link subframes 703 and 713 may be applied with advanced technologies having new functions and uses, detailed configurations will be omitted.

The frame may include the intermediate link subframes 701 and 711 in order to transparently provide a start position of a frame preceded by a preamble and a TTG (Transmit / Receive Transition Gap) position, which is a guard region. It is positioned before the link subframes 703 and 713.

In the end link subframes 701 and 711, the direct terminal link service provided by the base station 720 and the relay terminal link service provided by the relay station 1 730 are divided into frequency division multiplexing, space division multiplexing, and orthogonal frequency division multiple access. Is provided.

In addition, in the end link subframes 701 and 711, the relay station 1 730 transmits control information and traffic to the terminal in the same structure as the direct terminal link service provided by the base station 720 in order to transparently perform relaying. Provide a burst. The relay station 2 receives the bursts 705 and 707 of a predetermined area from the base station 720 or the relay station 1 730, and transparently provides the unicast traffic channel to the terminal.

The intermediate link subframes 703 and 713 may be time-multiplexed according to the hop link as shown in FIG. 8 when considering expansion to multiple hops.

8 illustrates a subframe configuration of an intermediate link in a multi-hop relay broadband wireless access communication system according to an embodiment of the present invention. In the following description, the relay link subframe may include a control channel and a traffic channel having various structures.

Referring to FIG. 8, FIG. 8A shows that links are multiplexed in a direction in which hop counts are reduced in the intermediate link subframes 803 and 813. That is, the link of the (n-1) -hop relay station and the n-hop relay station is multiplexed ahead of the base station and 1-hop relay link.

8B shows that the links are multiplexed in the direction in which the number of hops increases in the intermediate link subframes 803 and 813. That is, the base station and one-hop relay link are multiplexed ahead of the link of the (n-1) -hop relay station and the n-hop relay station.

As shown in FIG. 7 and FIG. 8, the unidirectional subframe is divided into an end link subframe and an intermediate link subframe to provide a broadband wireless access service, and thus have the same frame start timing as shown in FIG. 9.

9 illustrates timing of a base station, a terminal, and a relay station in a multi-hop relay broadband wireless access communication system according to an exemplary embodiment of the present invention. In the following description, a system having a two hop link will be described as an example, and the relay station 1 and the relay station 2 each provide one-hop relay service to other terminals.

As illustrated in FIG. 9, in the downlink subframe 900, the base station 920 transmits control information and a traffic burst to the terminal during the end link subframe 901 (D_t1 section). In addition, the base station 920 transmits control information and traffic bursts to the relay stations 930 and 940 during the intermediate link subframe 903 (section D_t3).

The RS 1 940 transmits control information and traffic bursts to the UE during the end link subframe 901 (section D_t1). In addition, control information and traffic bursts necessary for relaying during the intermediate link subframe 903 are received from the base station 920 (section D_t3). In this case, the RS 1 940 transmits control information and traffic bursts to the next hop RS during the intermediate link subframe 903. At this time, the time slot of the intermediate link subframe 903 is adaptively determined according to the multi-hop number and the channel state.

The RS 2 930 configures the control channel section D_t2 to be null in the section of the end link subframe 901 and transmits a unicast traffic burst to the terminal using the remaining sections (D_t2 to D_t1 section). ). In addition, during the intermediate link subframe 903, control information and traffic bursts necessary to perform a relay service are received from the base station 920 (section D_t3).

The terminal 950 receives a control channel and a traffic burst from a base station or a relay station during an end link subframe 901 and ignores an intermediate link subframe 903 because it is an area not allocated to the terminal 950. .

Meanwhile, in the uplink subframe 910, the base station 920 receives initial ranging information and traffic burst from the terminal during the end link subframe 911 (U_t1 section). Further, during the intermediate link subframe 913, initial ranging information and traffic bursts are received from the relay stations 930 and 940 (section U_t3).

The RS 1 940 receives initial ranging information and a traffic burst from the UE in order to perform a relay link service during an end link subframe 911 (U_t1 section). In addition, the initial ranging information and the traffic burst are transmitted to the base station 920 during the intermediate link subframe 913 (U_t3 section).

The RS 2 930 configures the control channel section U_t2 as null in the end link subframe 911 and receives a traffic burst from the terminal to perform a relay service using the remaining sections. (U_t2-U_t1 section). In addition, the unicaster traffic burst is transmitted to the base station 920 during the intermediate link subframe 913 (U_t3 section).

The terminal 950 transmits initial ranging information and a traffic burst from the base station or the relay station during the end link subframe 911 (U_t1 section). In this case, the terminal 950 transmits a signal by compensating for a delay that occurs when the downlink subframe 900 receives a signal from the base station or the relay station.

In addition, the terminal 930 is ignored because the area is not allocated to the terminal 950 during the intermediate link subframe 913.

As described above, within the unidirectional subframe, the relay station should perform operation switching. Accordingly, RS TTG is required in the downlink subframe 900 and RS RTG is required in the uplink subframe 910. For example, the time protection regions TTG and RTG may configure a first symbol of the relay link as a preamble having a short length in the downlink subframe, so that the relay station performs an operation switching for the remaining period. have. Here, the short preamble is generated by reducing the number of repetitive sequences constituting the preamble.

Alternatively, the base station may form a gap between the end link subframe 901 and the intermediate link subframe 903 so that the relay station can perform operation switching.

FIG. 10 illustrates a frame configuration when assuming that an intermediate link subframe has the same control and traffic channel structure as an end link subframe in a multi-hop relay broadband wireless access communication system according to an exemplary embodiment of the present invention. .

As illustrated in FIG. 10, the unidirectional subframes (eg, downlink subframes and uplink subframes) of the two-hop link system are the end link subframes 1001 and 1011 and the intermediate link subframes 1003 and 1013. It is composed.

In the end link subframes 1001 and 1011, a direct terminal link service provided by a base station and a relay terminal link service provided by a relay station are provided in the form of frequency division multiplexing or spatial division multiplexing and orthogonal frequency division multiple access.

11 is a flowchart illustrating an operation procedure of a base station in a multi-hop relay broadband wireless access communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 11, in step 1101, the base station allocates resources for the end link subframe period 701 and the intermediate link subframe period 703. Here, the end link subframe period 701 and the intermediate link subframe period 703 may be fixed or may be adaptively changed according to a service environment. If there is no relay station in the service area, the section for the intermediate link can be omitted.

After allocating resources for the end link subframe period 701 and the intermediate link subframe period 703, the base station proceeds to step 1103 to communicate with the terminals through the end link subframe period 701. Do this.

In step 1105, the base station communicates with the relay stations using the intermediate link subframe duration 703.

For example, in the downlink period, the base station transmits control information and traffic burst to the terminal during the end link subframe period 701, and control information and traffic burst to the relay station during the intermediate link subframe period 703. Send it.

In addition, in the uplink period, the base station receives initial ranging information and traffic burst from the terminal during the end link subframe period 701, and initial ranging information from the relay station during the intermediate link subframe period 703. And receive a traffic burst.

The base station then terminates this algorithm.

12 illustrates an operation procedure of a relay station in a multi-hop relay broadband wireless access communication system according to an embodiment of the present invention.

Referring to FIG. 12, the RS first checks whether preamble and control information are received from the base station when the power is turned on in step 1201.

If the preamble and the control information are received, the RS proceeds to step 1203 and performs an initialization operation for network entry using the received preamble and the control information. The relay station performs the initial operation as a terminal and performs the terminal link rather than the intermediate link. After performing the initial operation, the relay station establishes the intermediate link through the intermediate link information. In addition, it may be performed through the intermediate link from the initial operation, rather than through the termination link as described above. In this case, a preamble and a control signal for the termination link are needed.

Thereafter, the RS establishes the intermediate link and the termination link according to the operation capability of the base station and the relay capability of the RS in steps 1205 and 1207 to support broadband service. For example, the relay station receives control information and traffic bursts for relay service from the base station or relay station during the intermediate link subframe duration 703. Thereafter, the control information and the traffic burst are transmitted to the terminal through the end link subframe period 701 in the next frame.

The relay station then terminates this algorithm.

As described above, since the block configuration of the base station and the relay station for generating the unidirectional subframe including the end link subframe and the intermediate link subframe is the same, a block configuration of the base station will be described as an example as shown in FIG. . In the following description, a transceiver for an end link for communicating with a terminal and a transceiver for an intermediate link for communicating with a relay station are described separately, but one transceiver may support the end link and the intermediate link.

13 is a block diagram of a base station in a multi-hop relay broadband wireless access communication system according to the present invention.

As shown in FIG. 13, the base station is a medium. A transceiver 1301 for a link, a transceiver 1303 for an end link, a timing controller 1305, an RF duplexer 1307, and an antenna 1309 are configured. Where the middle The transceiver 1301 for the link and the transceiver 1303 for the termination link have the same configuration, so that the intermediate An example of a transmission / reception device 1301 for a link will be described.

The middle The transceiver 1301 for a link includes a transmitter 1311, a receiver 1321, and an RF switch 1331.

The transmitting device 1311 includes a frame generator 1313, a resource mapper 1315, a modulator 1317, and a digital / analog converter 1319.

Frame generator 1313 configures an intermediate link subframe for sending control information and traffic bursts to the relay station. Here, the frame generator 1343 of the transmitter for the end link service configures an end link subframe for transmitting the control information and the traffic burst to the terminal.

The resource mapper 1315 allocates and outputs the intermediate link subframe provided from the frame generator 1313 to the burst of each link allocated to each subframe.

The modulator 1317 receives the subframes allocated to the burst of each link from the resource mapper 1315 and modulates the subframes according to a predetermined modulation scheme, and then converts the digital signal into an analog signal in the digital / analog converter 1319. To the RF switch 1331.

The receiving device 1321 includes an analog / digital converter 1323, a demodulator 1325, a resource demapper 1327, and a frame extractor 1327.

The analog-to-digital converter 1323 receives an analog signal converted into a baseband signal by converting the signal received through the RF switch 1331 from the relay stations during the intermediate link subframe period into a digital signal.

The demodulator 1325 demodulates and outputs the digital signal provided from the analog-to-digital converter 1323 according to the corresponding demodulation scheme.

The resource demapper 1327 extracts the actual subframes allocated to the burst of each link provided from the demodulator 1325.

The frame extractor 1327 extracts a subframe corresponding to the receiver 1321 from the subframe provided from the resource demapper 1327. For example, the frame extractor 1329 extracts an intermediate link subframe of an uplink subframe received from the relay stations.

The RF switch 1331 connects the transceivers 1311 and 1321 and the RF duplexer 1307 to an intermediate link service interval under the control of the timing controller 1305.

The timing controller 1305 is intermediate Controls the transmission and reception timing of the interval for the link service and the interval for the end link service.

The RF duplexer 1307 intermediates the RF signal received through the antenna 1309. Each signal is separated and transmitted to the transmission / reception apparatus 1301 and 1303 according to the section for the link service and the section for the end link service.

The above-described embodiment has described a frame structure for communication between a base station, a relay station and terminals in a two-hop relay broadband wireless access communication system. If the broadband wireless access communication system includes three hops or more multiple hops, the relay service may be supported using a frame structure as shown in FIG. 14. In this case, even in the case of three or more hops as shown in the frame structure of FIG. 14, a relay service may be supported using a base station or a relay station apparatus having the same structure as that of FIG.

14 illustrates a frame configuration of a broadband wireless access communication system using a three-hop or more relay method according to an exemplary embodiment of the present invention. Hereinafter, the base station, the relay station, and the terminal will be described with an example of performing communication by forming a spatial multiplexed frame at one frequency. In addition, the first relay station means a 1-hop relay station that receives data directly from the base station and performs a relay service. The second relay station refers to a two-hop relay station that receives data passing through the base station and the first relay station and performs a relay service.

As illustrated in FIG. 14, the j-th frame 1400 includes a downlink subframe 1410 and an uplink subframe 1420. In this case, the subframes 1410 and 1420 are divided into first sections 1411 and 1421, second sections 1413 and 1423, and third sections 1415 and 1425, respectively. Here, the first intervals 1411 and 1421 include a subframe for the base station and the terminal link and a subframe for the relay station terminal link for communication between the base station and the terminal or the relay station and the terminal. The second periods 1413 and 1423 include a subframe for the base station and the relay station link and a subframe for the relay station and the terminal link for communication between the base station and the relay station or the terminal and the terminal. Lastly, the third periods 1415 and 1425 include a subframe for linking the base station and the terminal and a subframe for the link between the relay station and the relay station for communication between the base station and the terminal or the relay station and the relay station.

In addition, a TTG (Transmit / receive Transmission Gap), which is a time protection region, exists between the downlink subframe 1410 and the uplink subframe 1420.

In case of supporting the relay service composed of multiple hops using the j-th frame 1400 configured as described above, the base station 1430 is first connected to the first interval 1411 of the downlink subframe 1410. The downlink data is transmitted to the terminal 1 1460 during the third period 1415. In addition, downlink data is transmitted to the first relay station 1440 during the second period 1413.

Thereafter, the base station 1430 receives uplink data from the terminal 1 1460 during the first section 1421 and the third section 1425 of the uplink subframe 1420. In addition, uplink data is received from the first relay station 1440 during the second period 1423.

The first relay station 1440 transmits downlink data to the terminal 2 1470 during the first period 1411 of the downlink subframe 1410. In addition, downlink data is received from the base station 1430 during the second period 1413. The downlink data is transmitted to the second relay station 1450 during the third period 1415.

Thereafter, the first RS 1440 receives UL data from the UE 2 1470 during the first interval 1421 of the UL subframe 1420. In addition, uplink data is transmitted from the base station 1430 during the second period 1423. Uplink data is received from the second relay station 1450 during the third period 1425.

Next, the second relay station 1450 transmits downlink data to the terminal 3 1480 during the first interval 1411 and the second interval 1413 of the downlink subframe 1410. In addition, downlink data is received from the first relay station 1440 during the third period 1415.

Thereafter, the second relay station 1450 receives uplink data from the terminal 3 1480 during the first section 1421 and the second section 1423 of the uplink subframe 1420. In addition, uplink data is transmitted to the first relay station 1440 during the third period 1425.

The terminal 1 1460, the terminal 2 1470, and the terminal 3 1480, which communicate with each other through the base station 1430, the first relay station 1440, and the second relay station 1450, have the j-th frame 1400. Receives downlink data from a subject to which a communication link is connected during the downlink subframe 1410 of FIG. In addition, during the uplink subframe 1420, uplink data is transmitted to a subject to which the communication link is connected.

For example, the terminal 1 1460 receives downlink data from the base station 1430 during the first period 1411 and the third period 1415 of the downlink subframe 1410. In addition, uplink data is transmitted to the base station 1400 during the first period 1421 and the third period 1425 of the uplink subframe 1420.

Next, the terminal 2 1470 receives downlink data from the first relay station 1440 during the first period 1411 of the downlink subframe 1410. In addition, uplink data is transmitted to the first relay station 1440 during the first period 1421 of the uplink subframe 1420.

Finally, the terminal 3 1480 receives downlink data from the second relay station 1450 during the first section 1411 and the second section 1413 of the downlink subframe 1410. In addition, uplink data is transmitted to the second relay station 1450 during the first interval 1421 and the second interval 1423 of the uplink subframe 1420.

In the frame structure configured as shown in FIG. 14, when each subframe uses the same structure as the IEEE 802.16 system, the subframe is configured as shown in FIG. 15. In this case, FIG. 15A illustrates a frame structure of a base station and a first relay station, and FIG. 15B illustrates a frame structure of a second relay station and a terminal.

As shown in FIG. 15, the j-th frame 1500 includes a downlink subframe 1510 and an uplink subframe 1520. In this case, the subframes 1510 and 1520 are divided into first sections 1511 and 1521, second sections 1513 and 1523, and third sections 1515 and 1525, respectively.

Between the downlink subframe 1510 and the uplink subframe 1520, there is a TTG (Transmit / receive Transmission Gap), which is a time protection region.

15A illustrates a frame structure of a base station and a first relay station in a broadband wireless access communication system using a three-hop or more relay method according to an embodiment of the present invention.

As shown in FIG. 15A, in the first period 1511 of the downlink subframe 1510, the base station 1530 and the first relay station 1540 transmit to terminals included in each service area. Configure a downlink subframe for the. That is, the base station 1530 and the first relay station 1540 are sequentially configured with preambles, control information, and downlink bursts for synchronization of the terminals during the first period 1511. Here, the preamble and the control information have a fixed position.

In the second period 1513, the base station 1530 is sequentially configured with a synchronization channel, control information, and downlink burst for synchronization of the first relay station 1540 transmitted to the first relay station 1540. In this case, the first relay station 1540 receives a signal transmitted by the base station 1530.

In the third period 1515, the base station 1530 configures a downlink subframe for transmitting to the terminal 1. That is, the base station 1530 is sequentially configured with preambles, control information, and downlink bursts for synchronization of the terminal 1. Here, the preamble and the control information have a fixed position.

In addition, the first relay station 1540 configures a downlink subframe for transmission to the second relay station 1550. Here, the downlink subframe transmitted from the first relay station 1540 to the second relay station 1550 includes a preamble, control information, and a downlink burst for synchronization of the second relay station 1550.

Next, in the first period 1521 of the uplink subframe 1520, the base station 1530 and the first relay station 1540 control information (eg, ranging signals) from terminals included in each service area. And receive an uplink burst.

In the second period 1523, the first relay station 1540 configures an uplink subframe for transmitting to the base station 1530. In this case, the base station 1530 receives a signal transmitted by the first relay station 1540.

In the third section 1525, the base station 1530 receives a signal transmitted by the terminal 1. In addition, the first relay station 1540 receives a signal transmitted by the second relay station 1550.

15B illustrates a frame of a second relay station and a terminal in a broadband wireless access communication system using a three-hop or more relay scheme according to an exemplary embodiment of the present invention.

As shown in FIG. 15B, in the first section 1511 and the second section 1513 of the downlink subframe 1510, the second relay station 1550 transmits to the terminal 3 included in the service area. Configure a downlink subframe for the. That is, the second relay station 1550 is sequentially configured with preambles, control information, and downlink bursts for synchronization of the terminal 3 during the first period 1511. Here, the preamble and the control information have a fixed position.

In the third section 1515, the second relay station 1550 receives a signal transmitted by the first relay station 1540.

In addition, in the downlink subframe 1510, the terminals receive a downlink subframe from a subject of each service area.

Next, in the first section 1521 and the second section 1523 of the uplink subframe 1520, the second relay station 1550 may transmit control information (eg, a ranging signal) and an uplink burst from the terminal 3. Receive.

In the third section 1525, the second relay station 1550 configures an uplink subframe for transmitting to the first relay station 1540. Here, the uplink subframe is sequentially configured with control information and uplink burst.

In addition, the terminals configure an uplink subframe for transmission to the subjects of the service area of each terminal in the first interval 1521. Here, the uplink subframe is sequentially configured with control information and uplink burst.

The terminals configure an uplink subframe according to each service area subject in the second section 1523 and the third section 1525. For example, the terminal 1 1560 that communicates with the base station 1530 configures an uplink subframe for transmitting to the base station 1530 in the third section 1525. In addition, the terminal 3 communicating with the second relay station 1550 configures an uplink subframe for transmitting to the second relay station 1550 in the second section 1523.

In the above-described embodiment, the synchronization channel is positioned in front of the first section, the second section, and the third section. In another embodiment, the synchronization channel may be positioned behind the second and third sections.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, in a broadband wireless access communication system using a multi-hop relay method, signal transmission is time-division multiplexed into an end link region and an intermediate link region so that direct and relay services are transparently provided to the terminal in a synchronous frame form. Handover and synchronization according to the horse's mobility is easy, and the intermediate link area provided by the relay station is independent of the end link area, thereby increasing the degree of freedom of the relay link according to the hop number and channel environment. .

Claims (35)

A subframe configuration method for supporting a relay service in a multi-hop relay broadband wireless access communication system, Configuring a subframe for performing communication with a terminal at a base station or a relay station during a first period of the subframe; And configuring a subframe for communicating with the relay station at the base station or the terminal during the second period of the subframe. The method of claim 1, The first section and the second section of the subframe, characterized in that divided into time resources or frequency resources. The method of claim 1, The first period of the subframe includes at least one of a subframe for the base station and the terminal link and a subframe for the relay station and the terminal link. The method of claim 3, wherein The subframe for the base station and the terminal link and the subframe for the relay station and the terminal link may include frequency division multiple access, spatial division multiple access, and orthogonal frequency division multiple access. Frequency division multiplxing access). The method of claim 3, wherein And a subframe for the base station and the terminal link and a subframe for the relay station and the terminal link have the same structure in order to maintain transparency. The method of claim 3, wherein The relay station comprises at least one of a first relay station providing a synchronization channel and a second relay station not providing the synchronization channel. The method of claim 6, And the second relay station configures a synchronization channel and a control channel interval of the end link subframe to be null. The method of claim 1, The second period of the subframe includes at least one of a subframe for the base station and the relay station link and a subframe for the relay station and the relay station link. The method of claim 8, And a subframe for the base station and the relay station link and a subframe for the relay station and the relay station link using time resources or frequency resources. The method of claim 1, The first and second sections of the subframe have a fixed size or have a dynamic size according to a service environment. The method of claim 1, And a time protection region is allocated between the first section and the second section of the subframe for switching the operation of the relay station. A method of operating a base station for supporting a relay service in a multi-hop relay broadband wireless access communication system, Allocating resources for a first section for communicating with the terminal and a second section for communicating with the relay station; After allocating the resource, communicating with the terminal using the first interval; And communicating with the relay station using the second section. The method of claim 12, The first and second sections have a fixed size or have a dynamic size according to a service environment. The method of claim 12, And a time protection zone is allocated between the first interval and the second interval. The method of claim 12, The first section and the second section, characterized in that divided using the time resources or frequency resources. A method of operating a relay station for supporting a relay service in a multi-hop relay broadband wireless access communication system, Performing network entry using control information received from a base station; receiving control information and a traffic burst for a relay service from the base station or another relay station in an nth frame; and transmitting the received control information and the traffic burst to a terminal in an n + 1th frame. The method of claim 16, The relay station comprises at least one of a first relay station providing a synchronization channel and a second relay station not providing the synchronization channel. The method of claim 17, And the second relay station configures a synchronization channel and a control channel section to be null. An apparatus for supporting a relay service in a multi-hop relay broadband wireless access communication system, A timing controller providing a transmission / reception timing signal of a signal for communicating with a terminal and a signal for communicating with a relay station according to a frame configuration method; RF (Radio Frequency) duplexer for separating the transmission and reception signals, And a transceiver for communicating with the terminal or relay station in accordance with the timing signal. The method of claim 19, The transceiver includes a first transceiver for communicating with the terminal and a second transceiver for communicating with the relay station. The method of claim 20, The first transceiver, A transmitter for forming and transmitting a subframe for transmitting a signal to the terminal according to the timing signal; A receiver for receiving a signal from the terminal and restoring data according to the timing signal; And a switch connecting the transceiver and the antenna under the control of the timing controller. The method of claim 20, The second transceiver, A transmitter for forming and transmitting a subframe for transmitting a signal to the relay station according to the timing signal; A receiver for receiving a signal from the relay station and restoring data according to the timing signal; And a switch connecting the transceiver and the antenna under the control of the timing controller. A subframe configuration method for supporting a relay service in a multi-hop relay broadband wireless access communication system, Configuring a subframe for performing communication with a terminal at a base station or a relay station during a first period of the subframe; Configuring a subframe for communication between the base station and the relay station or the terminal and the terminal during the second period of the subframe; And configuring a subframe for performing communication by the base station and the terminal or the relay station and the relay station during the third period of the subframe. The method of claim 23, wherein The first section, the second section and the third section of the subframe are divided into time resources or frequency resources. The method of claim 23, wherein The first period of the subframe includes at least one of a subframe for the base station and the terminal link and a subframe for the relay station and the terminal link. The method of claim 25, The subframe for the base station and the terminal link and the subframe for the relay station and the terminal link may include frequency division multiple access, spatial division multiple access, and orthogonal frequency division multiple access. Frequency division multiplxing access). The method of claim 25, And a subframe for the base station and the terminal link and a subframe for the relay station and the terminal link have the same structure in order to maintain transparency. The method of claim 23, wherein The second period of the subframe includes at least one of a subframe for the base station and the relay station link and a subframe for the relay station and the terminal link. The method of claim 28, The subframe for the base station and the relay station link and the subframe for the relay station and the terminal link are distinguished using time resources or frequency resources. The method of claim 29, The relay station of the subframe for the base station and the relay station link and the subframe for the relay station and the terminal link is a different relay station. The method of claim 23, wherein The third section of the subframe includes at least one of a subframe for the base station and the terminal link, and a subframe for the relay station and the relay station link. The method of claim 31, wherein The subframe for the base station and the terminal link and the subframe for the relay station and the relay station link, characterized in that using the time resources or frequency resources. The method of claim 23, wherein The first section, the second section, and the third section of the subframe have a fixed size or have a dynamic size according to a service environment. The method of claim 23, wherein The first period of the subframe, characterized in that for positioning the synchronization channel at the front end. The method of claim 23, wherein The second section and the third section of the subframe, characterized in that for positioning the synchronization channel in the front or rear end.

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