KR20090114589A - Apparatus and method for persistent resource allocation in a broadband wireless communication system - Google Patents

Abstract

PURPOSE: A static allocation apparatus and a method thereof in a broadband wireless communication system capable of efficiently processing the occurrence of resource hole by using minimum overhead are provided to transmit the static allocation information through minimum overhead by indicating persistent allocation information. CONSTITUTION: A BS(Base Station) selects a terminal(201). A persistent allocation type is applied on the terminal. The base station classifies the group as the terminal is selected(203). The static allocation area is set according to a group cycle(205). The base station allocates the resources to the terminal of corresponding group within the static allocation area. The base station confirms the start point of allocation change section compared with a previous resource allocation result(207). The base station produces the fixed allocation information message.

Description

Fixed allocation device and method in broadband wireless communication system {APPARATUS AND METHOD FOR PERSISTENT RESOURCE ALLOCATION IN A BROADBAND WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a broadband wireless communication system, and more particularly, to provide an apparatus and method for the persistent allocation of resources in a broadband wireless communication system.

The 4th Generation (hereinafter referred to as '4G') communication system provides users with services of various quality of service (QoS) using a transmission rate of about 100 Mbps. There is active research going on. 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 system.

According to the 802.16 system, the base station and the terminal communicates in units of physical frames. The base station transmits a resource allocation message every frame, and the terminal can know the resources allocated to itself in the frame through the resource allocation message. In this case, when there is a terminal having a service that periodically or continuously generates traffic, it is unnecessary to inform resource allocation information by using a resource allocation message every frame. In order to solve this problem, a method of fixedly allocating a resource in a specific region of each frame is considered. Such a resource allocation method is called a fixed allocation method.

In applying the fixed allocation scheme, in general, the utilization of resource holes caused by the reduction of overhead and the fixed allocation of resource allocation messages, which is the original purpose of the fixed allocation scheme, is considered. In other words, the overhead is reduced as much as possible, and the generated resource holes should be used efficiently. Therefore, a specific procedure of the fixed allocation method that can efficiently handle the occurrence of resource holes with minimum overhead should be presented.

Accordingly, it is an object of the present invention to provide an apparatus and method for informing persistent allocation information with minimal overhead in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for notifying of fixed allocation of resources without additional overhead in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for transmitting allocation change information in a common format regardless of the reason for the change of the fixed allocation in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for delivering fixed allocation information using a start point of an allocation change interval and changed allocation information in a broadband wireless communication system.

According to a first aspect of the present invention for achieving the above object, a resource allocation method of a base station in a broadband wireless communication system, the process of allocating resources in a fixed allocation area of a group consisting of terminals having the same resource allocation period, Comparing the previous resource allocation result with the current resource allocation result to identify a starting point of the allocation change interval, the starting point information, at least one added or changed slot allocation information, added or changed fixed allocation number information, and added unfixed and generating a fixed allocation information message including at least one of (non-presistent) allocation count information, and transmitting the fixed allocation information message.

According to a second aspect of the present invention for achieving the above object, a method for confirming a resource allocation result of a terminal in a broadband wireless communication system, after a fixed allocation of resources, the allocation change interval included in the fixed allocation information message received from the base station And checking the starting point information of the terminal, and recognizing that the fixed allocated resource does not change when the starting point is later than the first slot of the resource allocated to the starting point.

According to a third aspect of the present invention for achieving the above object, in a broadband wireless communication system, a base station apparatus allocates resources in a fixed allocation area of a group consisting of terminals having the same resource allocation period, By comparing the current resource allocation result, at least one of the allocator for identifying the starting point of the allocation change interval, the starting point information, at least one added or changed slot allocation information, added or changed fixed allocation number information, added non-fixed allocation number information And a generator for generating a fixed assignment information message including one and a transmitter for transmitting the fixed assignment information message.

According to a fourth aspect of the present invention for achieving the above object, in a broadband wireless communication system, after a terminal is fixedly allocated resources, the terminal device confirms the starting point information of the allocation change interval included in the fixed allocation information message received from the base station. And a manager for recognizing that the fixed allocated resource does not change when the starting point is later than the first slot of the resource allocated to the starting point.

In the broadband wireless communication system, the fixed allocation information is represented using only the start point of the allocation change interval and the changed allocation information, so that the fixed allocation information can be delivered to the terminals with only a minimum overhead.

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, a description will be given of a technique for implementing a persistent allocation scheme with minimal overhead in a broadband 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.

The base station according to the present invention sets the terminals having the same resource allocation period (period) to the same group, and performs fixed allocation in group units. In this case, fixedly allocated resources are allocated in one dimension. In other words, resources in the fixed allocation area are expressed as starting points and lengths. The base station transmits a fixed assignment information message for each group according to the period for each group. The fixed assignment information message includes a group identifier and location information of the fixed assignment area of the group. Accordingly, the terminal checks whether it is a fixed allocation information message of its group by using the group identifier, checks the position of the fixed allocation area of its group, and then uses the slot allocation information included in the fixed allocation information message. Check the slots assigned to. Here, the slot allocation information is configured for each terminal and includes an identifier of the terminal and slot duration information.

When the resource allocation in the fixed allocation area of the group is changed compared to the previous allocation result, the fixed allocation information message includes starting point information of the allocation change interval. Here, the starting point of the allocation change interval means the starting point of the allocation changed interval compared to the previous allocation result, and the change includes both the new allocation and the quantitative increase and decrease of the allocated resource. Slot assignment information is arranged in the order of addition or change. Accordingly, the terminal may calculate the starting position of the resource allocated to the terminal by summing slot periods of the resources allocated before the resource allocated to the starting point of the allocation change interval.

In addition, the terminal can know whether to release the resources allocated to them by comparing the starting point of the allocation change interval and the location of the resources allocated to them. That is, when it is confirmed that the starting point of the allocation change interval is earlier than or equal to the first slot of the resource allocated to it, and at the same time, it is confirmed that the slot allocation information for the self does not exist, the terminal is assigned to the resource allocated to itself. Recognize that it is released.

Slots left after the fixed allocation in the fixed allocation area may be non-persistent. In this case, the base station arranges the fixed allocated resources ahead of the non-fixed allocated resources, and transmits the changed fixed allocation number and non-fixed allocation number information through the fixed allocation information message. Accordingly, the terminal may recognize whether the resource allocated to the terminal according to the fixed allocation method according to the relative position of the resource allocated to the terminal.

Hereinafter, the present invention describes a configuration of a resource usage and fixed allocation information message according to a specific example of a fixed allocation scheme.

First, as shown in FIG. 1A, resources are fixedly allocated to the terminal 7 and the terminal 1. That is, the terminal 7 is fixedly allocated to the slot 1 to the slot 10, the terminal 1 is fixedly allocated to the slot 11 to slot 24. Accordingly, the base station transmits the fixed allocation information message including the identifier of the terminal 7 and the slot period allocated to the terminal 7, the identifier of the terminal 1 and the slot period information allocated to the terminal 1 in the frame. At this time, in the message, slot allocation information for each terminal is arranged in the order of allocation. Accordingly, the terminal 1 and the terminal 7 can calculate the starting point of the slots assigned to them.

Thereafter, as shown in FIG. 1B, resources are fixedly allocated to the terminal 25 and the terminal 11, and resources are non-persistently allocated to the terminal 39. That is, the terminal 25 is fixedly allocated to the slots 26 to 30, the terminal 11 is fixedly allocated to the slots 31 to 40, and the terminal 39 is unfixedly allocated to the slots 41 to 45. Accordingly, the base station transmits a fixed allocation information message including the starting point of the added resource, the number of added fixed allocations, the number of added non-fixed allocations, and the slot allocation information for each terminal. Here, the slot allocation information for each terminal includes an identifier of the terminal and an allocated slot period. In addition, within the message, slot allocation information for each terminal is arranged in the order of allocation. Therefore, each terminal can calculate the starting position of resources allocated to it. In this case, the terminal 39 recognizes that the resources allocated to the self are not fixed by referring to the fixed allocation number and the non-fixed allocation number.

Thereafter, as shown in FIG. 1C, resources fixedly allocated to the terminal 1 are released, and resources are fixedly allocated to the terminal 14. As a result, the positions of resources allocated to the terminal 7, the terminal 25, and the terminal 11 are moved forward by 10 slots. In addition, the terminal 14 is unfixedly allocated to the slots 26 to 30. Accordingly, the base station transmits a fixed allocation information message including a starting point of the allocation change interval, the number of changed fixed allocations, the number of added non-fixed allocations, and the slot allocation information for each terminal. In this case, the message includes slot allocation information of the terminal 25, slot allocation information of the terminal 11, and slot allocation information of the terminal 14 as slot allocation information for each terminal. Accordingly, the terminal 1 confirms that a change occurs from the start position of the resource allocated to the terminal 1 and confirms that the slot allocation information for the terminal does not exist, thereby recognizing that the resource allocated to the terminal 1 is released. In addition, the terminal 25, the terminal 11, and the terminal 14 calculate the positions of the slots allocated to the terminal 25, the terminal 11, and the terminal 14 using the starting point of the allocation change interval and the slot allocation information. At this time, the terminal 14 recognizes that the resources allocated to the self are not fixed by referring to the fixed allocation number and the non-fixed allocation number. In addition, the terminal 7 recognizes that the starting point of the allocation change interval is located behind the resources allocated to the terminal 7, and thus recognizes that the resources allocated to the terminal 7 do not change.

Thereafter, as shown in FIG. 1D, resources allocated to the terminal 25 increase, resources allocated to the terminal 11 are released, resources are fixedly allocated to the terminal 31, and resources are fixedly allocated to the terminal 8. That is, resources allocated to the terminal 25 are increased to 10 slots, the terminal 31 is fixedly allocated to the slots 20 to 30, and the terminal 8 is unfixedly allocated to the slots 30 to 35. Accordingly, the base station transmits a fixed allocation information message including a starting point of the allocation change interval, the number of changed fixed allocations, the number of added non-fixed allocations, and the slot allocation information for each terminal. In this case, the message includes slot allocation information of terminal 25, slot allocation information of terminal 31, and slot allocation information of terminal 8 as slot allocation information for each terminal. Accordingly, the terminal 11 confirms that the change occurs before the resource allocated to the terminal 11, and confirms that the slot allocation information for the terminal does not exist, thereby recognizing that the resource allocated to the terminal 11 is released. In addition, the terminal 25, the terminal 31, and the terminal 8 calculate the position and the number of slots allocated to the terminal using the starting point of the allocation change interval and the slot allocation information about the terminal. In this case, the terminal 8 recognizes that the resources allocated to the self are not fixed by referring to the fixed allocation number and the non-fixed allocation number. In addition, the terminal 7 recognizes that the starting point of the allocation change interval is located behind the resources allocated to the terminal 7, and thus recognizes that the resources allocated to the terminal 7 do not change.

According to the example described with reference to FIG. 1, slot allocation information for each terminal includes an identifier of the terminal and allocated slot duration information. However, the slot allocation information for each terminal further includes a Modulation and Coding Scheme (MCS) level indicator flag and MCS level information in addition to the identifier and the allocated slot duration of the terminal. If the added resource or the slot allocation information for the resource whose MCS level is changed, the MCS level indication flag is set to one. Accordingly, when the MCS level indication flag is 1, slot allocation information includes MCS level information, and when the MCS level indication flag is 0, slot allocation information does not include MCS level information. Therefore, if the MCS level indication flag is 0, the terminal follows the MCS level identified through previous slot assignment information. On the other hand, when the MCS level indication flag is 1, the terminal checks the new MCS level, and follows the newly confirmed MCS level.

An example of the fixed allocation information message used for resource allocation and resource identification as described above is shown in Table 1 below.

Syntax Size (bit) Notes Persistent HARQ is MAP IE () {  Extended-2 DIUC 4  Length 8  RCID type 2  Group ID 4 Group indentifier for this Persistent IE  Number of persistent allocations 4 PA_Num, Number of persistent allocations which are included in thid IE  Number of non-persistent allocations 4 NPA_Num, Number of non-persistent allocations which are included in thid IE  DL Persistent Control IE () variable  For (i = 1; i <= PA_Num + NPA_Num; i ++) {   RCID variable    Slot duration 10   Mode One 0: HARQ, 1: MIMO    MCS change indicator One    Chase Sub-Burst indicator One    if (Mode == 0) {     if (MCS change indicator == 1) { Is only MSC level changed?      DL_MCS_Change sub-IE ()}     if (Chase Sub-Burst indicator == 1) { Is it newly allcated?      Persistent DL HARQ Chase Sub-Burst IE ()}    } else if (Mode == 1) {     if (MCS change indicator == 1) { Is only MSC level changed?      DL_MCS_Change sub-IE ()}     if (Chase Sub-Burst indicator == 1) { Is it newly allcated?      Persistent MIMO DL HARQ Chase Sub-Burst IE ()}    }  } }

'DL Persistent Control IE ()' in the fixed allocation information message shown in Table 1 is configured as shown in Table 2 below.

Syntax Size (bit) Notes DL PErsistent control IE () {  Persistent control indicator 8  if (LBS # 0 of Persistent control indicator == 1) { Group Region indicator   OFDMA symbol offset 8   Subchannel offset 8   Number of OFDMA symbols 8   Number of subchannels 8  }  if (LBS # 1 of Persistent control indicator == 1) { Group Period indicator   Group allocation period} 4  if (LBS # 2 of Persistent control indicator == 1) { ACK channel start offset indicator for persistent allocation   ACK CH Start Offset} 8  if (LBS # 3 of Persistent control indicator == 1) { PCC indicator   Persistent Change Counter} 8  if (LBS # 4 of Persistent control indicator == 1) { PCC indicator   Changed Sub-Burst Slot Offset 8  } }

In Table 2, 'Changed Sub-Brust Slot Offset' indicates the start position of the burst of the terminal corresponding to the first RCID. The starting position may be represented by a slot period from a two-dimensional or group region. In the previous allocation, the resource allocation information of the terminal allocated the resource before the 'Changed Sub-Brust Slot Offset' is maintained without change. However, it is determined that the resource of the terminal that does not include its RCID among the terminals allocated the resource after the 'Changed Sub-Brust Slot Offset' is released.

2 illustrates a resource allocation procedure of a base station in a broadband wireless communication system according to an embodiment of the present invention.

Referring to FIG. 2, the base station selects terminals to which the fixed allocation scheme is applied in step 201. That is, the base station selects terminals requiring periodic data transmission and reception using the service flow characteristic of each terminal.

After selecting terminals to which the fixed allocation scheme is to be applied, the base station proceeds to step 203 and classifies the selected terminals into a plurality of groups according to an allocation period. That is, the base station classifies terminals having the same data transmission / reception period into the same group. Accordingly, terminals having the same data transmission / reception period are allocated resources as one group.

After performing the group classification, the base station proceeds to step 205 to set a fixed allocation area according to the period for each group, and the base station allocates resources in the fixed allocation area, that is, slots to the terminals belonging to the group do. In this case, when a fixedly allocated resource and a non-fixedly allocated resource exist together in the fixed allocation area, the base station allocates the resource so that the fixedly allocated resource is located ahead of the non-fixedly allocated resource.

Subsequently, the base station proceeds to step 207 to check the starting point of the allocation change interval of the resource allocation result performed in step 205 compared to the previous resource allocation result. Herein, the resource allocation change occurs due to at least one of allocation addition, allocation allocation, and allocation change.

After confirming the starting point of the allocation change interval, the base station proceeds to step 209 to generate a fixed allocation information message. In this case, the fixed allocation information message includes a group identifier, location information of a fixed allocation area of the group, the starting point information, at least one added or changed slot allocation information, added or changed fixed allocation number information, and added non-fixed allocation number information. Include. When a plurality of slot allocation information is included, the plurality of slot allocation information are arranged in the same order as the resource allocation order. Each slot allocation information includes an identifier of the terminal, an allocated slot period, an MCS level indication flag, and MCS level information. For example, the fixed assignment information message is configured as shown in Table 1 and Table 2.

After generating the fixed allocation information message, the base station proceeds to step 211 and transmits the fixed allocation information message to the terminals.

3 is a flowchart illustrating a resource allocation result checking procedure of a terminal in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the terminal checks whether a fixed allocation information message is received from the base station in step 301. For example, the fixed assignment information message is configured as shown in Table 1 and Table 2.

When the fixed allocation information message is received, the terminal proceeds to step 303 and checks whether a previously fixed allocation resource exists. If there is a previously fixed allocation of resources, the terminal proceeds to step 309. If there is no previously fixed allocation of resources, the terminal proceeds to step 305.

If there is no fixed allocation resource previously, the terminal proceeds to step 305 and checks whether slot allocation information for itself exists in the fixed allocation information message. That is, the terminal checks whether slot allocation information including its identifier exists.

If there is slot allocation information for itself, the terminal proceeds to step 307 and checks resource allocation information for itself. That is, the terminal checks slots allocated to the terminal through slot allocation information including its identifier. In addition, the terminal checks the MCS level indication flag and the MCS level included in the slot allocation information. The terminal determines whether the resource allocated to itself is a fixed allocation by referring to the fixed allocation number and the non-fixed allocation number information included in the fixed allocation information message. That is, when the number of slot allocation information disposed before the terminal is smaller than the fixed allocation number, the terminal recognizes that the resource allocated to the terminal is fixed allocation.

In step 303, if there is a previously fixed allocation of resources, the terminal proceeds to step 309 and checks whether the starting point of the allocation change interval is ahead of the first slot of the fixed allocation of resources. That is, the terminal checks whether a fixed fixed resource is included in the allocation change interval.

If the fixed fixed resource is not included in the allocation change interval, the terminal proceeds to step 311 and recognizes that the previously fixed allocated resource is not changed, and maintains the set resource allocation information.

On the other hand, if the fixed resources allocated to the self is included in the allocation change interval, the terminal proceeds to step 313 to determine whether there is slot allocation information for itself. That is, the terminal checks whether slot allocation information including its identifier exists.

If there is slot allocation information for itself, the terminal proceeds to step 315 to update the set resource allocation information. That is, the terminal checks slots allocated to itself through slot allocation information including its identifier, and then updates the identified resource allocation information with the set resource allocation information. At this time, the terminal checks the MCS level indication flag and the MCS level included in the slot allocation information. In addition, the terminal determines whether the resource allocated to itself is a fixed allocation by referring to the fixed allocation number and the non-fixed allocation number information included in the fixed allocation information message. That is, when the number of slot allocation information disposed before the terminal is smaller than the fixed allocation number, the terminal recognizes that the resource allocated to the terminal is fixed allocation.

On the other hand, if there is no slot allocation information for itself, the terminal proceeds to step 317 and recognizes that the previously fixed resources have been released, and deletes the set resource allocation information.

After confirming the resources allocated to the terminal by performing the procedure of FIG. 3, the terminal performs communication according to the newly set resource allocation information.

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

As shown in FIG. 4, the base station includes a group classifier 402, a resource allocator 404, a message generator 406, an encoder 408, a symbol modulator 410, a subcarrier mapper 412, and OFDM. And a modulator 414 and an RF transmitter 416.

The group classifier 402 selects terminals to which the fixed allocation scheme is to be applied and classifies the selected terminals into a plurality of groups according to an allocation period. That is, the group classifier 402 selects terminals requiring periodic data transmission and reception using the service flow characteristics of each terminal. The group classifier 402 classifies terminals having the same data transmission / reception period into the same group. According to the group classification of the group classifier 402, terminals having the same data transmission / reception period are allocated resources as one group.

The resource allocator 404 allocates resources to the terminals. In particular, the resource allocator 404 sets a fixed allocation area according to a period of each group, and allocates resources in the fixed allocation area to terminals belonging to the group. In this case, when a fixedly allocated resource and a non-fixedly allocated resource exist together in the fixed allocation area, the resource allocator 404 allocates the resource so that the fixedly allocated resource is positioned ahead of the non-fixedly allocated resource. In addition, the resource allocator 404 identifies the starting point of the allocation change interval of the resource allocation result performed in step 205 compared to the previous resource allocation result. Herein, the resource allocation change occurs due to at least one of allocation addition, allocation allocation, and allocation change. In addition, the resource allocator 404 provides a resource allocation result and the starting point information to the message generator 406 to generate a fixed allocation information message.

The message generator 406 generates a fixed assignment information message to be sent to the terminal. In this case, the message generator 406 generates a fixed allocation information message including only slot allocation information of the allocation change interval compared to the previous resource allocation. That is, the message generator 406 includes a group identifier, location information of a fixed allocation area of a group, the starting point information, at least one added or changed slot allocation information, added or changed fixed allocation number information, and added non-fixed allocation number information. Create a fixed assignment information message comprising a. However, when a plurality of slot allocation information is included, the plurality of slot allocation information is arranged in the same order as the resource allocation order. Each slot allocation information includes an identifier of the terminal, an allocated slot period, an MCS level indication flag, and MCS level information. For example, the fixed assignment information message is configured as shown in Table 1 and Table 2.

The encoder 408 channel codes the information bit string provided from the message generator 406. The symbol modulator 410 demodulates the channel-coded bit string and converts the complex code into complex symbols. The subcarrier mapper 412 maps the complex symbols to the frequency domain. The OFDM modulator 414 converts complex symbols mapped to the frequency domain into a time domain signal through an inverse fast fourier transform (IFFT) operation, and constructs an OFDM symbol by inserting a cyclic prefix (CP). The RF transmitter 416 up-converts the baseband signal into an RF band signal and transmits it through an antenna.

5 is a block diagram of a terminal in a broadband wireless communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 5, the terminal includes an RF receiver 502, an OFDM demodulator 504, a subcarrier demapper 506, a symbol demodulator 508, a decoder 510, a message interpreter 512, The resource information manager 514 is configured.

The RF receiver 502 downconverts an RF band signal received through an antenna to a baseband signal. The OFDM demodulator 404 divides the signal provided from the RF receiver 502 in OFDM symbol units, removes a CP, and restores complex symbols mapped to a frequency domain through a fast fourier transform (FFT) operation. . The subcarrier demapper 506 extracts a signal mapped to a resource allocated to the terminal itself among the complex symbols mapped to the frequency domain. The symbol demodulator 508 demodulates the complex symbols into a bit string. The decoder 510 performs channel decoding on the bit stream.

The message interpreter 512 checks the information included in the control message received from the base station. In particular, the message interpreter 512 interprets the fixed allocation information message, thereby identifying the group identifier, the position information of the fixed allocation area of the group, the starting point information of the allocation change interval, the at least one added or changed slot allocation information, and the fixed fixed or added information. Check the allocation count information and the added non-fixed allocation count information. For example, the fixed assignment information message is configured as shown in Table 1 and Table 2.

The resource information manager 514 manages the resource allocation status of the terminal itself using the information identified by the message interpreter 512.

If there is no fixed allocation resource previously, the resource information manager 514 checks whether slot allocation information for the terminal itself exists in the fixed allocation information message. As a result of the check, if there is slot allocation information for the terminal itself, the resource information manager 514 checks whether the slots, MCS level, fixed assignment assigned to itself through the slot allocation information for itself.

If there is a fixed allocation of resources previously, the resource information manager 514 checks whether the start point of the allocation change interval is ahead of the first slot of the fixed allocation resources. That is, the resource information manager 514 checks whether the resource fixedly allocated to the terminal itself is included in the allocation change section. If the resource fixedly allocated to the terminal itself is not included in the allocation change section, the resource information manager 514 proceeds to recognize that the previously fixedly allocated resource is not changed and maintains the set resource allocation information. .

On the other hand, if there is a fixed allocation of resources previously, and the fixed allocation of resources to the terminal itself is included in the allocation change interval, the resource information manager 514 checks whether the slot allocation information for the terminal itself exists. At this time, if there is slot allocation information for the terminal itself, the resource information manager 514 updates the set resource allocation information. At this time, the resource information manager 514 checks the MCS level and fixed assignment. However, if the slot allocation information for the terminal itself does not exist, the resource information manager 514 recognizes that the previously fixed resource has been released, and deletes the set resource allocation information.

In the resource allocation procedure and the resource allocation result checking procedure described with reference to FIGS. 1 to 5, the division of the uplink and the downlink is not specified. In general, since resource allocation for uplink and resource allocation for downlink are performed independently, it is obvious that the above-described resource allocation procedure and resource allocation result checking procedure are also independently performed by being divided into uplink and downlink. That is, the present invention can be applied to both uplink fixed allocation and downlink fixed allocation.

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.

1 is a diagram illustrating an example of resource usage of a fixed allocation area in a broadband wireless communication system according to the present invention;

2 is a diagram illustrating a resource allocation procedure of a base station in a broadband wireless communication system according to an embodiment of the present invention;

3 is a diagram illustrating a resource checking procedure of a terminal in a broadband wireless communication system according to an embodiment of the present invention;

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

5 is a block diagram of a terminal in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Claims (24)

A method for allocating resources of a base station in a broadband wireless communication system, Allocating resources in a fixed allocation area of a group of terminals having the same resource allocation period; Comparing the previous resource allocation result with the current resource allocation result to identify a starting point of the allocation change interval; Generating a fixed allocation information message including at least one of the starting point information, at least one added or changed slot allocation information, added or changed fixed allocation number information, and added non-presistent allocation number information; Transmitting the fixed assignment information message. The method of claim 1, The process of generating the fixed assignment information message, And arranging a plurality of slot allocation information in the order of addition or change. The method of claim 1, The at least one slot allocation information includes at least one of an identifier of a terminal, an assigned slot duration, a modulation and coding scheme (MCS) level indicator flag, and MCS level information. Way. The method of claim 1, Allocating a resource in the fixed allocation area, And allocating the resources such that the fixed-allocated resources are positioned ahead of the non-fixed-allocated resources. The method of claim 1, Selecting terminals to which the fixed allocation scheme is to be applied; And grouping the selected terminals according to the fixed allocation period. The method of claim 1, The transmitting of the fixed allocation information message may include: Converting the fixed allocation information message into complex symbols; Converting the complex symbols into a time-domain signal through an inverse fast fourier transform (IFFT) operation; And constructing an orthogonal frequency division multiplexing (OFDM) symbol by inserting a cyclic prefix (CP) into the time domain signal. In the method of checking the resource allocation result of the terminal in a broadband wireless communication system, Checking the starting point information of the allocation change interval included in the fixed allocation information message received from the base station after the resource is permanently allocated; And if the starting point is later than the first slot of the resource allocated to the starting point, recognizing that the fixed allocated resource does not change. The method of claim 7, wherein And if the starting point is earlier than or equal to the first slot of the resource allocated to the starting point, and if the slot allocation information for the same does not exist, recognizing that the fixed allocated resource is released. The method of claim 7, wherein When the starting point is earlier than or equal to the first slot of the resource allocated to the starting point, if slot allocation information including its own identifier exists, recognizing that the fixed allocated resource is changed; And identifying a resource allocated to the user through slot allocation information including the own identifier. The method of claim 9, The slot assignment information includes at least one of an identifier of a terminal, an assigned slot duration, a Modulation and Coding Scheme (MCS) level indicator flag, and MCS level information. The method of claim 10, The process of identifying the resources allocated to the self, Confirming the number of fixed allocations added or changed through the fixed allocation information message and the number of non-persistents added; Recognizing that the resource allocated to the non-fixed allocated resource is equal to the number of the slot allocation information disposed earlier than the fixed allocation number; And recognizing that the resource allocated to the fixed resource is a fixed allocated resource when the number of the slot allocation information disposed before the smaller number is smaller than the fixed allocation number. The method of claim 7, wherein Removing the CP from the received signal and converting the signals to subcarrier signals through a Fast Fourier Transform (FFT) operation; And demodulating and decoding subcarrier-specific signals to restore the fixed allocation information message. A base station apparatus in a broadband wireless communication system, An allocator for allocating a resource in a fixed allocation area of a group of terminals having the same resource allocation period and comparing a previous resource allocation result and a current resource allocation result to identify a starting point of the allocation change interval; A generator for generating a fixed allocation information message including at least one of the starting point information, at least one added or changed slot allocation information, added or changed fixed allocation number information, and added non-presistent allocation number information; And a transmitter for transmitting said fixed assignment information message. The method of claim 13, And the generator arranges the plurality of slot allocation information in an added or changed order. The method of claim 13, The at least one slot allocation information includes at least one of an identifier of a terminal, an assigned slot duration, a modulation and coding scheme (MCS) level indicator flag, and MCS level information. Device. The method of claim 13, And the allocator allocates resources such that the fixedly allocated resources are positioned ahead of the non-fixedly allocated resources. The method of claim 13, And a classifier for selecting terminals to which the fixed allocation scheme is to be applied and grouping the selected terminals according to the fixed allocation period. The method of claim 13, A modulator for converting the fixed allocation information message into complex symbols; The apparatus further includes an OFDM modulator configured to convert the complex symbols into a time domain signal through an inverse fast fourier transform (IFFT) operation, and construct an orthogonal frequency division multiplexing (OFDM) symbol by inserting a cyclic prefix (CP) into the time domain signal. Device characterized in that. A terminal device in a broadband wireless communication system. An interpreter for checking the starting point information of the allocation change interval included in the fixed allocation information message received from the base station after the resource is permanently allocated; And a manager for recognizing that the fixed allocated resource does not change when the starting point is after the first slot of the resource allocated to the starting point. The method of claim 19, And if the starting point is before or equal to the first slot of the resource allocated to the manager, if there is no slot allocation information for the manager, the manager recognizes that the fixed allocated resource is released. The method of claim 19, If the starting point is earlier than or equal to the first slot of the resource allocated to the manager, the manager recognizes that the fixed allocation resource has been changed when the slot allocation information including its identifier exists, and recognizes the identifier of the own identifier. Device for identifying the resources allocated to them through the slot allocation information comprising. The method of claim 21, The slot allocation information includes at least one of an identifier of a terminal, an assigned slot duration, a Modulation and Coding Scheme (MCS) level indicator flag, and MCS level information. The method of claim 22, The manager, after confirming the number of fixed allocations added or changed through the fixed allocation information message and the added non-persistent number, the number of slot allocation information placed before the fixed number is larger than the fixed allocation number, or In the same case, it is recognized that the resource allocated to the self is a non-fixed allocated resource, and if the number of the slot allocation information disposed earlier than the number is smaller than the fixed allocation number, it is recognized that the resource allocated to the fixed resource is allocated. Device characterized in that. The method of claim 19, An orthogonal frequency division multiplexing (OFDM) demodulator that removes a cyclic prefix from a received signal and converts the signals to subcarrier signals through a fast fourier transform (FFT) operation; A demodulator for converting subcarrier-specific signals into bit streams; And a decoder which restores the fixed allocation information message by decoding a bit string.

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