KR20100049442A - Apparatus and method for transmitting map with separate coding in a multi hop relay wireless communication system - Google Patents

Abstract

PURPOSE: A separation coding base map transmitting device and a method at a multi-hop relay wireless telecommunication system are provided to reduce the burden of the operation quantity for confirming the resources allocated to Lower nodes of the base station. CONSTITUTION: A decoder(524) decodes a map received from an upper node. An encoder(528) separately codes the map IE(Information Element) of a lower node included in the map using a station ID and a MCS(Modulation and Coding Scheme) level of the lower node. A transmitter(522) transmits the map IE separately coded to the lower node. An interpreter(526) confirms the resources allocated to the lower node through the map IE of the lower node. A controller(530) transmits data of the lower node through the resources.

Description

Separating Coding-Based Map Transmission Apparatus and Method in Multi-hop Relay Wireless Communication System {APPARATUS AND METHOD FOR TRANSMITTING MAP WITH SEPARATE CODING IN A MULTI HOP RELAY WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a multi hop relay wireless communication system, and more particularly, to an apparatus and method for transmitting a separate coding based map in a multi hop relay wireless communication system.

In the 4th Generation (hereinafter referred to as '4G') communication system, which is a next generation communication system, active to provide users with services having various Quality of Service (QoS) with a transmission rate of about 100 Mbps Research is ongoing. Particularly, in 4G communication systems, studies are being actively conducted to support high-speed services in a form of guaranteeing mobility and QoS in a broadband wireless access (BWA) communication system such as a wireless local area network system and a wireless urban area network system. Is going on. In addition, the representative communication system is the Institute of Electrical and Electronics Engineers (IEEE) 802.16 communication system.

Recently, in order to reduce overhead of a map message for notifying a scheduling result of a base station in the IEEE 802.16 system, a separate coding scheme has been considered. The separate coding scheme is a scheme of encoding each of the map IEs using a unique sequence assigned to the receiving node without including an identifier of a receiving node in map information elements (IEs). For example, a cyclic redundancy check (CRC) process using the unique sequence is performed. This eliminates the overhead due to the identifier of the receiving node. However, when the separation coding scheme is applied to multi-hop relay communication based on a centralized scheduling scheme, the following problem occurs.

According to the central scheduling scheme, the base station performs scheduling not only directly connected nodes but also nodes in a multi-hop relationship. Thus, the base station transmits maps for all nodes in the cell, and the relay station relays traffic data and maps of lower nodes. In addition, the relay station checks the location of the resource allocated to the lower node through a map for the lower node, and relays the data of the lower node through the identified position. In this case, when the separation coding is applied, the RS should decode maps of the lower nodes according to a unique sequence of the lower nodes and a modulation and coding scheme (MCS) level.

As described above, when the separate coding of the map is applied to the multi-hop relay communication according to the centralized scheduling method, the amount of computation of the RS for identifying the resources allocated to the lower nodes is very large. Therefore, in the multi-hop relay wireless communication system to which the separation coding is applied, there is a need for an alternative for reducing the computational burden on the relay station.

Accordingly, an object of the present invention is to provide an apparatus and method for reducing the computational burden on a relay station due to separate coding in a multi-hop relay wireless communication system.

Another object of the present invention is to provide an apparatus and method for identifying resources allocated to lower nodes of a relay station with a low amount of computation in a multi-hop relay wireless communication system.

It is still another object of the present invention to provide an apparatus and method for separate coding of maps for lower nodes by an immediate upper node in a multi-hop relay wireless communication system.

According to a first aspect of the present invention for achieving the above object, a method of operating a relay station in a multi-hop relay wireless communication system, decoding a map received from an upper node, and the at least one lower part included in the map Separating coding a map information element (IE) of the at least one sub-node included in the map by using a station IDentifier and a modulation and coding scheme (MCS) level of the node; And transmitting the separated coded map IE to the at least one lower node.

According to a second aspect of the present invention for achieving the above object, a method of operating a base station in a multi-hop relay wireless communication system, generating a map IEs for the nodes in the cell, and at least one node in a multi-hop relationship Inserting a map IE into a map IE of an upper node of a node in the multi-hop relationship; and inserting a map IE of a node in at least one 1-hop relationship into a station of the node in the at least one 1-hop relationship. Separation coding using an ID and an MCS level, and transmitting the separation coded map IE to the at least one lower node.

According to a third aspect of the present invention for achieving the above object, in a multi-hop relay wireless communication system, a relay station apparatus includes a decoder for decoding a map received from an upper node, and a station of the at least one lower node included in the map. An encoder for separating coding the map IE of the at least one lower node included in the map using an ID and an MCS level, and a transmitter for transmitting the separated coded map IE to the at least one lower node. It is done.

According to a fourth aspect of the present invention for achieving the above object, in a multi-hop relay wireless communication system, a base station apparatus generates map IEs for nodes in a cell, and maps IEs of nodes in at least one multi-hop relationship. A generator for inserting into the map IE of the upper node of the node in the multi-hop relationship, and the station ID and MCS level of the node in the at least one 1-hop relationship with the map IE of the node in the at least one 1-hop relationship And an encoder for separating coding using the transmitter and a transmitter for transmitting the separated coded map IE to the at least one lower node.

According to a fifth aspect of the present invention for achieving the above object, a method of operating a relay station in a multi-hop relay wireless communication system includes the steps of decoding a map received from an upper node, and including the data burst indicated by the map. Separating and coding a map information element (IE) of the at least one sub-node included in the map by using a station IDentifier and a modulation and coding scheme (MCS) level of the at least one sub-node. separate coding) and transmitting the separated coded map IE to the at least one lower node.

According to a sixth aspect of the present invention for achieving the above object, a method of operating a base station in a multi-hop relay wireless communication system, the process of generating a map information elements (IE) for nodes in a cell, and at least one multiple Configuring a map IE of a node in a hop relationship as a data burst of a parent node of a node in the multi-hop relationship, and a map IE of a node in at least one 1-hop relationship to the at least one 1-hop relationship Separating coding using a station IDentifier and a Modulation and Coding Scheme (MCS) level of a node in the node, and transmitting the separated coded map IE and the data burst to the at least one lower node. Characterized in that it comprises a process.

In a multi-hop relay wireless communication system, the base station includes map information elements (IEs) of nodes having a multi-hop relationship in the map IE of the relay station without separate coding, thereby calculating the amount of computation of the relay station for identifying resources allocated to the lower nodes. The burden is reduced.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of 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.

Hereinafter, the present invention describes a technique for reducing the computational burden of the relay station due to separate coding in a multi-hop relay wireless communication system. Hereinafter, the present invention will be described using an Orthogonal Frequency Division Multiplexing (OFDM) / Orthogonal Frequency Division Multiple Access (OFDMA) scheme as an example. The same applies to other wireless communication systems.

Assume one relay station directly connected to the base station. At this time, the relay station has at least one terminal or relay station as a lower node. The base station performing centralized scheduling allocates resources to not only the directly connected relay station but also subordinate nodes of the relay station. Thus, the base station transmits a map for the relay station and a map for lower nodes of the relay station. The relay station also relays traffic data for the lower nodes and a map for the lower nodes. At this time, the map information for the lower nodes is transferred to the lower nodes as shown in FIG. 1A or 1B. FIG. 1A illustrates a case in which map information for the lower nodes is delivered through a map of the RS, and FIG. 1B illustrates a case in which map information for the lower nodes is transmitted through a data burst of the RS. .

Referring to FIG. 1A, some of the downlink subframes 100 of the base station are used for transmission of the Map Information Elements (IEs) 105, and others are used for transmission of the data 107. As shown in FIG. 1A, a map 110 for relay station 1 is included in the map IEs 150, and the map 110 for relay station 1 includes map information for sub-nodes of relay station 1. 115). In this case, the map 110 for the relay station 1 is separated coded according to the station ID (Station IDentifier) and the Modulation and Coding Scheme (MCS) level of the relay station 1. However, the map information 115 for the lower nodes is included in the map 110 for the relay station 1 without being separated coded. As shown in FIG. 1A, the map information 115 for the lower nodes includes a station ID, a map IE, and an MCS level indicator of the lower node.

When the map 110 for the relay station 1 in the form of a coded block is received at the relay station 1, it is decoded according to the station ID and the MCS level of the relay station 1. Accordingly, the map information 115 for the lower nodes that are not separated coded is restored, and the RS 1 does not decode separately, that is, does not decode according to the station ID and MCS level of the lower nodes one by one. Obtain map IEs of nodes. Thereafter, the map information 115 for the lower nodes included in the map 110 for the relay station 1 is divided by the lower node through the station ID, and the relay station 1 is assigned to the station ID and the MCS level of each lower node. Are coded separately. In other words, RS 1 generates maps in the form of coded blocks by separating coding map IEs for lower nodes. That is, the relay station 1 reconfigures map IEs for the lower nodes. This generates maps 120, 130, 140 for lower nodes in the form of coded blocks. Thereafter, maps 120, 130, 140 for the lower nodes in the coded block form are transmitted to each lower node.

At this time, a lower relay station may exist among the lower nodes. Like the map 110 for the relay station 1, the map 140 for the relay station 2 which is the lower relay station includes map information 145 for the lower nodes of the relay station 2. Accordingly, as in the case of the relay station 1, the map information 145 for the lower nodes of the relay station 2 is divided by the lower node through the station ID of the lower node, and the station ID and the MCS of each lower node by the relay station 2. By separate coding according to the level, it is transformed into maps 150 and 160 for lower nodes in the form of coded blocks.

Referring to FIG. 1B, some of the downlink subframes 160 of the base station are used for transmission of the map IEs 165 and others are used for transmission of the data 167. As illustrated in FIG. 1B, a map 170 for relay station 1 is included in the map IEs 150 and indicates a downlink data burst of the relay station 1. In this case, map information 175 for lower nodes of the relay station 1 is included in the downlink data burst of the relay station 1. In addition, as in the case of FIG. 1A, the map information 175 for the lower nodes is not separated coded and is composed of a station ID, a map IE, and an MCS level indicator of the lower node.

When the map 170 for the relay station 1 in the form of a coded block is received by the relay station 1, it is decoded according to the station ID and the MCS level of the relay station 1. Accordingly, RS 1 identifies the location of the data burst and obtains map information 175 for the lower nodes that are not coded separately. That is, the relay station 1 obtains map IEs of the lower nodes without performing a separate operation, that is, does not decode according to the station ID and MCS level of the lower nodes. Thereafter, the map information 175 for the lower nodes is divided by the lower nodes through the station ID, and separated and coded by the relay station 1 according to the station ID and the MCS level of each lower node. In other words, RS 1 generates maps in the form of coded blocks by separating coding map IEs for lower nodes. That is, the relay station 1 reconfigures map IEs for the lower nodes. Then, maps for the lower nodes in the coded block form are transmitted to each lower node.

Hereinafter, the operation and configuration of a base station and a relay station transmitting a map as described above will be described in detail with reference to the accompanying drawings.

2A illustrates an operation procedure of a base station in a multi-hop relay wireless communication system according to a first embodiment of the present invention. The first embodiment is an example in which map information for lower nodes is transmitted through a map of a relay station as shown in FIG. 1A.

Referring to FIG. 2A, the base station performs scheduling for each node in step 201. That is, since the base station performs centralized scheduling, the base station performs scheduling for directly connected nodes and nodes in a multi-hop relationship, that is, all nodes in a cell. In other words, the base station determines the priority of the nodes and allocates resources according to the priority.

After performing the scheduling, the base station proceeds to step 203 to generate map IEs for informing the nodes of the scheduling result. The map IEs are generated by the number of nodes to which resources are allocated, and include location and size information of resources allocated to each of the nodes.

After generating the map IEs, the base station proceeds to step 205 to insert map IEs of nodes in a multi-hop relationship into map IEs of a higher node. Here, the upper node refers to an upper node directly connected to each of the nodes in the multi-hop relationship. For example, a relay station 1 directly connected to the base station, a terminal 1 in a 2-hop relationship connected to the relay station 1, a relay station 2 in a 2-hop relationship connected to the relay station 1, and a 3-hop relationship connected to the relay station 2 If there is a terminal 2 present in the base station, the base station includes the map IE of the terminal 2 in the map IE of the relay station 2, the map IE of the terminal 1 and the map IE of the relay station 2 to the map IE of the relay station 1 Include it. At this time, the station ID and the MCS level indicator corresponding to the map IE are inserted together with the map IE.

Subsequently, the base station proceeds to step 207 to separately code map IEs of nodes in a 1-hop relationship. In other words, the base station separately codes the nodes in the 1-hop relationship, that is, map IEs of directly connected terminals and relay stations according to a corresponding station ID and a corresponding MCS level. For example, the base station performs CRC processing on the map IEs of nodes in the 1-hop relationship with the corresponding station ID, and then encodes and modulates the corresponding MCS level. That is, the base station generates map blocks for nodes in a 1-hop relationship in the form of coded blocks.

After performing the separation coding, the base station proceeds to step 209 to transmit the separated coded map blocks and data. That is, the base station converts the complex symbols into complex symbols by modulating the data, maps the complex symbols and the map blocks to resources according to the scheduling result, and then performs an Inverse Fast Fourier Transform (IFFT) operation. OFDM symbols are configured through Cyclic Prefix (CP) insertion. The base station up-converts the OFDM symbols into a radio frequency (RF) band signal and transmits the same through an antenna.

2b illustrates an operation procedure of a base station in a multi-hop relay wireless communication system according to a first embodiment of the present invention. The second embodiment is an example in which map information for lower nodes is transmitted through a data burst of a relay station as shown in FIG. 1B.

Referring to FIG. 2B, the base station performs scheduling for each node in step 261. That is, since the base station performs centralized scheduling, the base station performs scheduling for directly connected nodes and nodes in a multi-hop relationship, that is, all nodes in a cell. In other words, the base station determines the priority of the nodes and allocates resources according to the priority.

After performing the scheduling, the base station proceeds to step 263 and generates map IEs for informing the nodes of the scheduling result. The map IEs are generated by the number of nodes to which resources are allocated, and include location and size information of resources allocated to each of the nodes.

After generating the map IEs, the base station proceeds to step 265 to configure map IEs of nodes in a multi-hop relationship as data bursts of higher nodes. Here, the upper node refers to an upper node directly connected to each of the nodes in the multi-hop relationship. For example, a relay station 1 directly connected to the base station, a terminal 1 in a 2-hop relationship connected to the relay station 1, a relay station 2 in a 2-hop relationship connected to the relay station 1, and a 3-hop relationship connected to the relay station 2 If there is a terminal 2 present in the base station, the base station configures the map IE of the terminal 2 as the data burst of the relay station 2, and the map IE of the terminal 1 and the map IE of the relay station 2 to burst the data of the relay station 1 It consists of. In this case, together with the map IE, a station ID and an MCS level indicator corresponding to the map IE are additionally included in the data burst.

Subsequently, the base station proceeds to step 267 to separately code map IEs of nodes in a 1-hop relationship. In other words, the base station separately codes the nodes in the 1-hop relationship, that is, map IEs of directly connected terminals and relay stations according to a corresponding station ID and a corresponding MCS level. For example, the base station performs CRC processing on the map IEs of nodes in the 1-hop relationship with the corresponding station ID, and then encodes and modulates the corresponding MCS level. That is, the base station generates map blocks for nodes in a 1-hop relationship in the form of coded blocks.

After performing the separation coding, the base station proceeds to step 269 to transmit the separated coded map blocks and data. At this time, the data burst configured in step 256 is also transmitted. That is, the base station converts the complex symbols into complex symbols by modulating the data, maps the complex symbols and the map blocks to resources according to the scheduling result, and then configures the OFDM symbols through IFFT operation and CP insertion. The base station upconverts the OFDM symbols into an RF band signal and transmits the same through an antenna.

3A illustrates an operation procedure of a relay station in a multi-hop relay wireless communication system according to a first embodiment of the present invention. The first embodiment is an example in which map information for lower nodes is transmitted through a map of a relay station as shown in FIG. 1A.

Referring to FIG. 3A, the RS extracts a map signal from a received signal from an upper node in step 301. That is, the RS converts the RF band signal received through the antenna into a baseband signal and divides the signal into OFDM symbols. The RS converts the OFDM symbols into complex symbols and extracts a map signal from the complex symbols through CP control and fast fourier transform (FFT) operation.

After extracting the map signal, the RS proceeds to step 303 to identify a map for itself through decoding according to its station ID and MCS level. That is, the RS divides the map signal into map block units, decodes each divided unit, and confirms the map for itself and restores the map IE. For example, the relay station demodulates and decodes each unit according to the MCS level of the relay station, and then CRC-processes using the station ID of the relay station, and if the CRC processing error does not occur, Determine it is a map.

After checking the map for itself, the RS proceeds to step 305 to identify map information for lower nodes included in the map for itself. That is, the map for the relay station includes map information for the lower nodes, and the map information is composed of the station ID, the map IE, and the MCS level of the lower node. Accordingly, the RS checks the resources allocated to the lower nodes through the map IE of the lower nodes without any operation.

After checking the map information, the RS proceeds to step 307 to separately code map information for the lower nodes. In other words, the relay station generates map blocks for each of the lower nodes in the form of a coded block. That is, the RS uses the station ID to classify map information for the lower nodes into lower nodes, and separately maps map IEs of the lower nodes according to the corresponding station ID and MCS level. For example, the RS performs CRC processing on the map IE of the lower nodes with the corresponding station ID, and then encodes and modulates the MCS level.

The relay station then proceeds to step 309 to transmit the separated coded map blocks and data. That is, the RS converts the complex symbols into complex symbols by modulating the data, maps the complex symbols and the map blocks to resources, and configures OFDM symbols through IFFT operation and CP insertion. The RS then upconverts the OFDM symbols into an RF band signal and transmits the signals through an antenna.

3B illustrates an operation procedure of a relay station in a multi-hop relay wireless communication system according to a second embodiment of the present invention. The second embodiment is an example in which map information for lower nodes is transmitted through a data burst of a relay station as shown in FIG. 1B.

Referring to FIG. 3B, the RS extracts a map signal from a received signal from an upper node in step 361. That is, the RS converts the RF band signal received through the antenna into a baseband signal and divides the signal into OFDM symbols. Then, the RS converts the OFDM symbols into complex symbols through CP control and FFT operation, and extracts a map signal from the complex symbols.

After extracting the map signal, the RS proceeds to step 363 to identify a map for itself through decoding according to its station ID and MCS level. That is, the RS divides the map signal into map block units, decodes each divided unit, and confirms the map for itself and restores the map IE. For example, the relay station demodulates and decodes each unit according to the MCS level of the relay station, and then CRC-processes using the station ID of the relay station, and if the CRC processing error does not occur, Determine it is a map.

After checking the map for itself, the RS proceeds to step 365 to check map information for lower nodes included in its downlink data burst. That is, the RS checks the location of its data burst through the map for itself and confirms map information for the lower nodes included in the data burst. Here, the map information is composed of a station ID, a map IE, and an MCS level of a lower node. Accordingly, the RS checks the resources allocated to the lower nodes through the map IE of the lower nodes without any operation.

After checking the map information, the RS proceeds to step 367 to separately code map information for the lower nodes. In other words, the relay station generates map blocks for each of the lower nodes in the form of a coded block. That is, the RS uses the station ID to classify map information for the lower nodes into lower nodes, and separately maps the map IEs of the lower nodes according to the corresponding station ID and MCS level. For example, the RS performs CRC processing on the map IE of the lower nodes with the corresponding station ID, and then encodes and modulates the MCS level.

The relay station then proceeds to step 369 to transmit the separated coded map blocks and data. That is, the RS converts the complex symbols into complex symbols by modulating the data, maps the complex symbols and the map blocks to resources, and configures OFDM symbols through IFFT operation and CP insertion. The RS then upconverts the OFDM symbols into an RF band signal and transmits the signals through an antenna.

4 is a block diagram of a base station in a multi-hop relay wireless communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 4, the base station includes a scheduler 402, a message generator 404, a map encoder 406, a data buffer 408, an encoder 410, a symbol modulator 412, and a subcarrier mapper ( 414, an OFDM modulator 416, and an RF transmitter 418.

The scheduler 402 performs scheduling for all nodes in the cell according to a centralized scheduling scheme. In other words, the scheduler 402 determines the priority of the nodes and allocates resources according to the priority.

The message generator 404 generates a Media Access Control management message to be transmitted to relay stations and terminals. For example, the message generator 404 generates a map IE for informing the scheduling result provided from the scheduler 402. In this case, the map IEs are generated as many as the number of nodes to which resources are allocated, and include location and size information of resources allocated to each of the nodes. In particular, according to the first embodiment of the present invention, the message generator 404 inserts map IEs of nodes in a multi-hop relationship into a map IE of an upper node. Here, the upper node refers to an upper node directly connected to each of the nodes in the multi-hop relationship. For example, a relay station 1 directly connected to the base station, a terminal 1 in a 2-hop relationship connected to the relay station 1, a relay station 2 in a 2-hop relationship connected to the relay station 1, and a 3-hop relationship connected to the relay station 2 If there is a terminal 2 present in the message generator 404, the message generator 404 includes the map IE of the terminal 2 in the map IE of the relay station 2, and includes the map IE of the terminal 1 and the map IE of the relay station 2 in the relay station 1 Include in your map's IE. At this time, the station ID and the MCS level indicator corresponding to the map IE are inserted together with the map IE. On the other hand, according to the second embodiment of the present invention, the message generator 404 provides the map IEs of the nodes in the 1-hop relationship to the map encoder 406, and the map of the nodes in the multi-hop relationship. IEs are provided to the data buffer 408. At this time, together with the map IEs of the nodes in the multi-hop relationship, the station ID and the MCS level indicator of the nodes in the multi-hop relationship are also provided to the data buffer 408.

The map encoder 406 separate codes map IEs. In other words, the map encoder 406 performs separate coding using map IEs according to the corresponding station ID and MCS level. In this case, the map encoder 406 separate-codes only map IEs of nodes in a 1-hop relationship. In other words, the base station separately codes map IEs of nodes in the 1-hop relationship, that is, directly connected terminals and relay stations. For example, the map encoder 406 performs CRC processing on the map IEs of nodes in the 1-hop relationship with the corresponding station ID, and then encodes and modulates the corresponding MCS level. That is, the map encoder 406 generates map blocks for nodes in a 1-hop relationship in the form of coded blocks.

The data buffer 408 temporarily stores information data to be transmitted to relay stations and terminals, and provides the stored information data to the encoder 410 according to a scheduling result of the scheduler 402. In particular, according to the second embodiment of the present invention, the data buffer 512 outputs map information for lower nodes provided from the message generator 404 to the encoder 410 as a data burst. In this case, the map information for the lower nodes includes a station ID, a map IE, and an MCS level indicator of the lower nodes. For example, a relay station 1 directly connected to the base station, a terminal 1 in a 2-hop relationship connected to the relay station 1, a relay station 2 in a 2-hop relationship connected to the relay station 1, and a 3-hop relationship connected to the relay station 2 If there is a terminal 2 present in the data buffer 408, the data buffer 408 outputs the map IE of the terminal 2 as the data burst of the relay station 2, and outputs the map IE of the terminal 1 and the map IE of the relay station 2 to the relay station 1 Output as a data burst of. At this time, the station ID and the MCS level indicator corresponding to the map IE are output together with the map IE.

The encoder 410 channel encodes the information data provided from the data buffer 408. The symbol modulator 412 converts the coded bit string provided from the encoder 410 into complex symbols. The subcarrier mapper 414 maps the complex symbols provided from the symbol modulator 412 to the frequency domain according to the scheduling result of the scheduler 402. do. The OFDM modulator 416 configures OFDM symbols by converting complex symbols mapped to the frequency domain into a time domain signal through an IFFT operation, and inserting a CP. The RF transmitter 418 upconverts the OFDM symbols into an RF band signal and then transmits the signals through an antenna.

5 is a block diagram of a relay station in a multi-hop relay wireless communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 5, the RS includes an RF receiver 502, an OFDM demodulator 504, a subcarrier demapper 506, a symbol demodulator 508, a decoder 510, a data buffer 512, Encoder 514, Symbol Modulator 516, Subcarrier Mapper 518, OFDM Modulator 520, RF Transmitter 522, Map Decoder 524, Message Interpreter 526, Map Encoder 528, Relay Controller 530 is configured.

The RF receiver 502 down-converts an RF band signal received through an antenna to a baseband signal. The OFDM demodulator 504 divides the signal provided from the RF receiver 502 into OFDM symbols, removes the CP, and restores the complex symbols mapped to the frequency domain through an FFT operation. The subcarrier demapper 506 classifies complex symbols mapped to the frequency domain into processing units. For example, the subcarrier mapper 506 extracts a map signal and provides it to the map decoder 524, and extracts a data signal and provides it to the symbol demodulator 508. The symbol demodulator 508 converts the complex symbols into a bit string by demodulating the complex symbols. The decoder 510 restores an information bit string by channel decoding the bit string.

The data buffer 512 temporarily stores information data received from an upper node, and provides the stored data to the encoder 514 under the control of the relay controller 530. In particular, according to the second embodiment of the present invention, the data buffer 512 provides the map encoder 528 with map information for the lower nodes received as data bursts under the control of the relay controller 530. do. Here, the map information is composed of a station ID, a map IE, and an MCS level of a lower node.

The encoder 514 channel encodes the information data provided from the data buffer 512. The symbol modulator 516 converts the channel coded bit string into complex symbols. The subcarrier mapper 518 maps the complex symbols to the frequency domain. In this case, the subcarrier mapper 518 maps the data signal according to resources allocated to the lower nodes identified by the message interpreter 526. The OFDM modulator 520 configures an OFDM symbol by converting complex symbols mapped to the frequency domain into a time domain signal through an IFFT operation, and inserting a CP. The RF transmitter 522 up-converts the baseband signal into a downlink band signal and transmits it through an antenna.

The map decoder 524 identifies a map for the relay station from the map signal provided from the subcarrier mapper 506. In other words, the map decoder 524 confirms a map for itself through decoding according to the station ID and MCS level of the relay station. That is, the RS identifies the map signal for the RS by dividing the map signal into map block units and decodes each divided unit to restore the map IE. For example, the map decoder 524 demodulates and decodes each unit according to the MCS level of the relay station, and then performs CRC processing using the station ID of the relay station, and if the CRC processing result error does not occur, It is determined that the map is for the relay station.

The message interpreter 526 checks the contents of the MAC management message received from the upper node. For example, the message interpreter 526 checks the allocated resources through the map IE restored by the map decoder 524. In other words, the message interpreter 526 identifies a resource for receiving data to be relayed and a resource for transmitting the data. In particular, according to the first embodiment of the present invention, the message interpreter 526 checks the map information for the lower nodes included in the map for the relay station. That is, the map for the relay station includes map information for the lower nodes, and the map information is composed of the station ID, the map IE, and the MCS level of the lower node. Accordingly, the message interpreter 526 checks the resources allocated to the lower nodes through the map IE of the lower nodes without any operation.

The map encoder 528 generates a map for lower nodes in the form of coded blocks. According to the first embodiment of the present invention, the map encoder 528 separate-codes map information for the lower nodes identified by the message interpreter 526. On the other hand, according to the second embodiment of the present invention, the map encoder 528 separately codes map information for the lower nodes provided from the data buffer 512. In other words, the map encoder 528 generates map blocks for each of the lower nodes in the form of a coded block. That is, the map encoder 528 classifies map information for the lower nodes by lower nodes using the station ID, and separately maps map IEs of the lower nodes according to the corresponding station ID and MCS level. For example, the map encoder 528 performs CRC processing on the map IE of the lower nodes with the corresponding station ID, and then encodes and modulates the MCS level.

The relay controller 530 controls the overall functions for data relay. That is, the relay controller 530 controls the output of the data buffer 512 according to the resource identified by the message interpreter 526 and transmits the signal through the resource to the subcarrier mapper 518. To control. In addition, according to the first embodiment of the present invention, the relay controller 530 divides the map information for the lower nodes identified by the message interpreter 526 for each lower node, and divides the map information into the map encoder. Provided at 528. On the other hand, according to the second embodiment of the present invention, the relay controller 530 provides the map encoder 528 with map information for the lower nodes received through the data burst and stored in the data buffer 512. To control.

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.

1A is a diagram showing an example of a transmission form of a map in a multi-hop relay wireless communication system according to a first embodiment of the present invention;

1B is a diagram showing an example of a transmission form of a map in a multi-hop relay wireless communication system according to a second embodiment of the present invention;

2A is a diagram illustrating an operation procedure of a base station in a multi-hop relay wireless communication system according to a first embodiment of the present invention;

2b is a diagram illustrating an operation procedure of a base station in a multi-hop relay wireless communication system according to a second embodiment of the present invention;

3A is a diagram illustrating an operation procedure of a relay station in a multi-hop relay wireless communication system according to a first embodiment of the present invention;

3B is a diagram illustrating an operation procedure of a relay station in a multi-hop relay wireless communication system according to a second embodiment of the present invention;

4 is a block diagram of a base station in a multi-hop relay wireless communication system according to an embodiment of the present invention;

5 is a block diagram of a relay station in a multi-hop relay wireless communication system according to an exemplary embodiment of the present invention.

Claims (21)

A method of operating a relay station in a multi-hop relay wireless communication system, Decoding a map received from an upper node, A map information element (IE) of the at least one lower node included in the map using a station IDentifier and a modulation and coding scheme (MCS) level of the at least one lower node included in the map. Separating coding (separate coding) and, Transmitting the separated coded map IE to the at least one subnode. The method of claim 1, Identifying resources allocated to the at least one lower node through a map IE of at least one lower node included in the map; And transmitting the data of the at least one lower node through the resources allocated to the at least one lower node. The method of claim 1, Decoding the map, Extracting a map signal from the received signal from the upper node; Dividing the map signal into map block units; And decoding each of the divided units using the station ID and the MCS level of the RS. The method of claim 1, The separation coding process, Performing a cyclic redundancy check (CRC) process on the map IE using the station ID; And encoding and modulating the CRC processed map IE according to the MCS level. A method of operating a base station in a multi-hop relay wireless communication system, Generating map information elements (IEs) for nodes in the cell; Inserting a map IE of a node in at least one multi-hop relationship into a map IE of a parent node of the node in the multi-hop relationship, Separating coding of a map IE of a node in at least one 1-hop relationship using a station IDentifier and a Modulation and Coding Scheme level of the node in the at least one 1-hop relationship Process, Transmitting the separated coded map IE to the at least one subnode. The method of claim 5, And inserting a station ID and an MCS level indicator of at least one node in a multi-hop relationship into a map IE of a higher node of the node in the multi-hop relationship. The method of claim 5, The separation coding process, Performing a cyclic redundancy check (CRC) process on the map IE using the station ID; And encoding and modulating the CRC processed map IE according to the MCS level. A relay station apparatus in a multi-hop relay wireless communication system, A decoder for decoding the map received from the upper node; A map information element (IE) of the at least one lower node included in the map using a station IDentifier and a modulation and coding scheme (MCS) level of the at least one lower node included in the map. An encoder for separating coding (separate coding), And a transmitter for transmitting a separated coded map IE to the at least one subnode. The method of claim 8, An interpreter for identifying a resource allocated to the at least one lower node through a map IE of at least one lower node included in the map; And a controller for controlling to transmit data of the at least one lower node through the resources allocated to the at least one lower node. The method of claim 8, The decoder, And dividing the map signal extracted from the received signal from the upper node into map block units, and decoding each of the divided units using the station ID and the MCS level of the relay station. The method of claim 8, The encoder is characterized in that the Cyclic Redundancy Check (CRC) processing of the map IE using the station ID, and encodes and modulates the CRC processed map IE according to the MCS level. A base station apparatus in a multi-hop relay wireless communication system, A generator for generating map information elements (IEs) for nodes in a cell and inserting a map IE of a node in at least one multi-hop relationship into a map IE of a parent node of a node in the multi-hop relationship; Separating coding of a map IE of a node in at least one 1-hop relationship using a station IDentifier and a Modulation and Coding Scheme level of the node in the at least one 1-hop relationship With the encoder, And a transmitter for transmitting a coded map IE to the at least one subnode. The method of claim 12, The generator, Inserting a station ID and an MCS level indicator of a node in at least one multi-hop relationship into a map IE of a parent node of the node in the multi-hop relationship. The method of claim 12, The encoder is characterized in that the Cyclic Redundancy Check (CRC) processing of the map IE using the station ID, and encodes and modulates the CRC processed map IE according to the MCS level. A method of operating a relay station in a multi-hop relay wireless communication system, Decoding a map received from an upper node, A map of the at least one lower node included in the map using a station IDentifier and a modulation and coding scheme (MCS) level of the at least one lower node included in the data burst indicated by the map. Separating coding the IE (map information element), Transmitting the separated coded map IE to the at least one subnode. The method of claim 15, Identifying resources allocated to the at least one lower node through a map IE of at least one lower node included in the data burst; And transmitting the data of the at least one lower node through the resources allocated to the at least one lower node. The method of claim 15, Decoding the map, Extracting a map signal from the received signal from the upper node; Dividing the map signal into map block units; And decoding each of the divided units using the station ID and the MCS level of the RS. The method of claim 15, The separation coding process, Performing a cyclic redundancy check (CRC) process on the map IE using the station ID; And encoding and modulating the CRC processed map IE according to the MCS level. A method of operating a base station in a multi-hop relay wireless communication system, Generating map information elements (IEs) for nodes in the cell; Configuring a map IE of at least one multi-hop relationship to a data burst of a parent node of the node in the multi-hop relationship, Separating coding of a map IE of a node in at least one 1-hop relationship using a station IDentifier and a Modulation and Coding Scheme level of the node in the at least one 1-hop relationship Process, And transmitting the coded map IE and the data burst to the at least one lower node. The method of claim 19, Adding a station ID and an MCS level indicator of a node in at least one multi-hop relationship to the data burst. The method of claim 19, The separation coding process, Performing a cyclic redundancy check (CRC) process on the map IE using the station ID; And encoding and modulating the CRC processed map IE according to the MCS level.

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