KR20100053089A - Apparatus and method for relocating anc changing persistently allocated resource in a broadband wireless communication system - Google Patents

Abstract

PURPOSE: A device for changing and moving persistently allocated resources in a broad band wireless communication system and a method thereof are provided to identify change or movement target resources through start location of the resources before movement and ACK channel bitmap. CONSTITUTION: In case change or movement of at least one persistently allocated resource(510~560) is generated, a base station creates resource movement IE(Information Element) through an ACK(ACKnowledge) channel number. At least one persistently allocated resource IE is identified by the resources movement IE. A plurality of resource changes and movements can be included in one resources movement IE.

Description

Apparatus and method for changing and moving fixed allocated resources in broadband wireless communication system {APPARATUS AND METHOD FOR RELOCATING ANC CHANGING PERSISTENTLY ALLOCATED RESOURCE IN A BROADBAND WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a broadband wireless communication system, and more particularly, to an apparatus and a method for changing and moving fixed allocated 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. The representative communication system is the Institute of Electrical and Electronics Engineers (IEEE) 802.16 system. The IEEE 802.16 system orthogonal frequency division multiplexing (hereinafter referred to as 'OFDM') / Orthogonal Frequency Division Multiple Access (orthogonal frequency division multiplexing) to support a broadband transmission network on a physical channel (Physical Channel) Multiple Access, hereinafter referred to as " OFDMA "

In a broadband wireless communication system such as the IEEE 802.16 system, a base station allocates resources to respective terminals for transmitting and receiving a packet. The base station transmits a map (MAP) message indicating a resource allocation result such as the location and size of the allocated resource, a modulation scheme, a coding rate, and the like through the downlink channel. In general, a message indicating a resource allocation result for uplink communication and a message indicating a resource allocation result for downlink communication are separately configured, and a unit of information required for one resource allocation is referred to as a map information element (IE). .

Resource allocation is performed on resources within a certain period. In this case, since resources for general data packets are allocated every predetermined period, a map IE for this is transmitted every predetermined period. However, in the case of a Voice over Internet Protocol (VoIP) service or a synchronous Hybrid Automatic Repeat reQuest (HARQ), in which packets are periodically transmitted, transmitting a map IE every transmission of a packet causes unnecessary waste of resources. Therefore, in the case of a packet having a periodic transmission period, such as a VoIP packet or a synchronous HARQ packet, a fixed allocation technique for reducing the waste of resources due to the map IE by fixedly allocating resources may be applied. According to the fixed allocation scheme, in case of downlink communication, the map IE and the packet are transmitted only at the first resource allocation, and after that, only the packet is transmitted without the map IE. Accordingly, the terminal using the fixed allocated resource continues to use the fixed allocated resource without the map IE until the allocation cancellation information or the allocation change information is received.

When the VoIP communication is terminated or reception of the synchronous HARQ packet is successful, the release of fixed resources allocated for the VoIP and the synchronous HARQ packet occurs. For example, as shown in FIG. 1, when release of allocation of VoIP fixed allocation resources allocated to region 1 100 occurs, region 1 100 becomes an empty resource region. In addition, when the channel condition changes, a change in the fixed allocated resource occurs due to a change in the MCS level. For example, as shown in FIG. 2, if the resource size after the change is increased due to a lower MCS level of a resource allocated to the region 2 200, a new region is used to avoid collision with other fixed allocated resources. Will be moved to. In this case, the area 2 200 becomes an empty resource area. In addition, as shown in FIG. 3, when the MCS level of resources fixedly allocated to the area including the area 3 300 increases, the size of the newly allocated resource is smaller than that of the existing one. An empty allocation area occurs. Since the VoIP packet has a small packet size, the area 3 300 becomes an empty resource area.

As described above, when the fixed allocation scheme is applied, empty resource regions occur due to various causes. In this case, the free resource area causes a decrease in the overall resource efficiency. Accordingly, there is a need for a method for effectively changing and moving fixed allocated resources in order to reallocate fixed allocated resources and remove the free resource area.

Accordingly, an object of the present invention is to provide an apparatus and method for removing an empty resource area between fixedly allocated resources in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for changing and moving fixed allocated resources in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for reducing overhead in changing and moving fixed allocated resources in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for identifying fixed allocation resources that are changed or moved in a broadband wireless communication system using an ACK (ACKnowledge) channel number.

According to a first aspect of the present invention for achieving the above object, the operation method of the base station in a broadband wireless communication system, when at least one fixed allocation resource change or movement occurs, using the ACK (ACKnowledge) channel number And generating a resource movement IE (Information Element) identifying at least one fixed allocation resource, and transmitting the resource movement IE.

According to a second aspect of the present invention for achieving the above object, a method of operating a terminal in a broadband wireless communication system, if a resource movement IE is included in the received map message, the fixed allocation through the resource movement IE Identifying a change or movement information of the resource, and restoring data by decoding a signal received through a resource of the moved position if the resource moved by the change or movement information is a resource allocated to the resource; Characterized in that.

According to a third aspect of the present invention for achieving the above object, in a broadband wireless communication system, when at least one fixed allocation resource change or movement occurs, the base station apparatus uses the at least one fixed allocation using an ACK channel number. And a generator for generating a resource movement IE for identifying a resource and a transmitter for transmitting the resource movement IE.

According to a fourth aspect of the present invention for achieving the above object, in a broadband wireless communication system, if a resource movement IE is included in a received map message, the terminal apparatus changes or moves a fixed allocation resource through the resource movement IE. An interpreter for confirming information and a data decoder for restoring data by decoding a signal received through the resource of the moved position if the resource moved by the change or movement information is a resource allocated to the same. do.

In a broadband wireless communication system, a resource for changing or moving is identified by using a start position of a resource before moving, an ACK (ACKnowledge) channel bitmap, and a parameter that collectively indicates a resource size and a modulation and coding scheme (MCS) level is used. By doing so, fixed allocation resources can be changed and moved with minimal 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, the present invention describes a technique for changing and moving fixedly allocated resources 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 frame structure of the broadband wireless communication system according to the present invention is shown in FIG.

As shown in FIG. 4, one superframe 410 is configured of a plurality of frames 420. Each frame 420 is composed of a plurality of subframes 430, and each subframe 430 is composed of a plurality of OFDMA symbols. Resource allocation is performed for resources in each subframe 430, and resources in each subframe 430 are allocated in units of a resource unit (RU) 440. That is, the terminal communicating with the base station is assigned an integer number of resource units.

Therefore, the map message is transmitted for each subframe 430. At this time, each of the map IEs indicating the resource allocation result included in the map message is subjected to a cyclic redundancy check (CRC) using a unique sequence allocated to the terminal that needs to receive the map IE. Therefore, each terminal distinguishes the map IE for itself by CRC checking each of the map IEs in a unique sequence assigned to it. This map IE encoding scheme is called separate coding.

According to the fixed allocation method, a resource amount may be changed or a fixed allocation resource may be moved due to a change in the MCS level of fixedly allocated resources (hereinafter, referred to as 'fixed allocation resources'). At this time, the base station should inform the terminals of the new MCS level, resource amount and location of the fixed allocation resources. To this end, the broadband wireless communication system according to the present invention uses the 'ACK (ACKnowledge) channel number', 'resource allocation information code' and 'resource unit offset'.

The 'ACK channel number' refers to an identification number of an ACK channel allocated in a corresponding subframe, and is used to recognize a resource to be moved in the present invention. In general, a CID (Connection IDentifier) is assigned to identify a newly allocated resource, and an ACK channel is allocated to determine whether reception of the allocated resource is successful. That is, each resource allocated in one subframe is assigned a CID and ACK channel number, and the fixed allocation resource continues to use the CID and ACK channel number without change. Therefore, within one subframe, fixed allocation resources can be distinguished through CID or ACK channel numbers. In general, the CID consists of more bits than the ACK channel number. For example, the CID is 16 bits and the ACK channel number is 4 bits. Therefore, the use of the ACK channel number for identification of fixed allocation resources greatly reduces overhead compared to using the CID. In this case, the system according to the present invention does not use the ACK channel number directly, but identifies fixed allocation resources that are changed or moved using the 'ACK channel bitmap' generated based on the 'ACK channel number'.

The resource allocation information code means a code indicating a combination of an MCS level and a resource allocation size. In order to fixedly allocate resources, an MCS level and a resource allocation size to be applied to the terminal are required. For example, for Voice over Internet Protocol (VoIP), Quadrature Phase Shift Keying (QPSK) 1/12, QPSK 1/8, QPSK 1/4, QPSK 1/2, QPSK 3/4, 16-QAM (Quadrature) Amplitude Modulation) Eight MCS levels of 1/2, 16-QAM 3/4, and 64-QAM 2/3 are distinguished, and resource allocation sizes of 1RU to 24RU are allocated to allocate VoIP packets having a size of 44 bytes. do. In this case, since 3 bits are required for MCS level classification and 5 bits are required for resource allocation size classification, 8 bits of information are needed as resource allocation information. However, when combining the MCS level and resource allocation size as shown in Table 1 below, since only 8 codes exist, resource allocation information having a size of 3 bits is configured.

Resource Allocation Information Code MCS level and resource allocation size 000 QPSK 1/12-24 RU 001 QPSK 1/8-16 RU 010 QPSK 1/4-8 RU 011 QPSK 1/2-4 RU 100 QPSK 3/4-3 RU 101 16-QAM 1/2-2 RU 110 16-QAM 3/4-2 RU 111 64-QAM 2/3-1 RU

The 'resource unit offset' means a start position after a change or movement of the fixed allocation resource that is changed or moved. That is, the 'resource unit offset' is used to indicate the location of the fixed allocation resource, that is, the resource unit index after the movement.

The resource movement IE for notifying change and movement of the fixed allocation resource is composed of bits corresponding to the ACK channel numbers of the fixed allocation resources in the subframe and indicates whether to change or move according to the value of each of the bits. A map, an allocation information bitmap indicating an MCS level and a resource amount after the change or movement of the at least one fixed allocation resource, and a resource unit offset indicating a start position after the change or movement of the at least one fixed allocation resource. That is, an 'ACK channel bitmap' generated based on a plurality of 'ACK channel numbers' is used to change and move a plurality of fixed allocation resources. Each of the bits constituting the ACK channel bitmap corresponds to each of fixed allocation resources arranged in ascending or descending order of the ACK channel number. For example, in the ascending order of ACK channel numbers, the first bit of the ACK channel bitmap corresponds to a fixed allocation resource having a minimum ACK channel number. In the ACK channel bitmap, '0' means that the fixed allocation resource having the corresponding ACK channel number is not changed or moved, and '1' means that the fixed allocation resource having the corresponding ACK channel number is changed or moved. In addition, new resource allocation information codes are assigned to each of the fixed allocation resources set to '1' in the ACK channel bitmap. At this time, the resource allocation information codes are bundled to form an 'allocation information bitmap', and the length of the allocation information bitmap is proportional to the number of bits set to '1' in the ACK channel bitmap.

That is, the fixed allocation resources that are changed or moved are identified by the ACK channel bitmap, and the resource allocation information after the changed or moved is represented by the allocation information bit map. Terminals having fixed allocation resources to be changed or moved are allocated resources of the amount indicated in the allocation information bitmap in the order indicated by '1' in the ACK channel bitmap. Accordingly, fixed allocation resources that are changed or moved through the ACK channel bitmap and the allocation information bitmap are continuously located. In the case of VoIP packets, a fixed allocation scheme is used and the size of the resources is small, so that a plurality of empty areas occur if fixed allocation resources for the VoIP packets are scattered. Therefore, in order to prevent the occurrence of the plurality of free areas, it is effective to position fixed allocation resource resources for the VoIP packets to be contiguous with each other. As such, when allocating resources to be contiguous, the positions of the fixed allocation resources that are changed or moved may be calculated from the start positions of the fixed allocation resources that are allocated in front. At this time, the start position of the fixed allocation resources to be changed or moved is indicated by the resource unit offset. That is, the terminals having the fixed allocation resource indicated by '1' in the ACK channel bitmap use the fixed allocation resource sequentially from the resource unit offset position by the resource allocation size indicated in the allocation information bitmap.

As described above, a specific example using the resource movement IE composed of the ACK channel bitmap, allocation information bitmap, and resource unit offset is as follows. In the following description, 'VoIP fixed allocation resource' means 'fixed allocation resource for VoIP packets'.

Referring to FIG. 5A, VoIP fixed allocation resources 1 510 are resource units 1 to 4, VoIP fixed allocation resources 2 520 are resource units 5 to 7, and VoIP fixed allocation resources 3 530 are resource units 8. To 11, VoIP fixed allocation resources 4 540 are resource units 12 to 17, VoIP fixed allocation resources 5 550 are resource units 18 to 21, and VoIP fixed allocation resources 6 560 are resource units 22 to 29. The data allocation resource 1 570 occupies resource units 30 to 33 and the data allocation resource 2 580 occupies resource units 34 to 36.

At this time, the VoIP fixed allocation resource 2 (520) is released, the MCS of the VoIP fixed allocation resource 3 (530) is changed to QPSK 3/4, the MCS of the VoIP fixed allocation resource 5 (550) is QPSK 1 / 4, and the MCS of the VoIP fixed allocation resource 6 (560) is changed to QPSK 3/4. Accordingly, the VoIP fixed allocation resources 3 530 are resource units 5 to 7, the VoIP fixed allocation resources 4 540 are resource units 8 to 13, and the VoIP fixed allocation resources 5 550 are resource units 14. To 19, the VoIP fixed allocation resource 6 (560) occupies resource units 20 to 22. Accordingly, resource change and movement are required for the VoIP fixed allocation resource 3 530, the VoIP fixed allocation resource 5 550, and the VoIP fixed allocation resource 6 560, and the VoIP fixed allocation resource 2 520. The resource movement for the VoIP fixed allocation resource 4 (540) is required to fill the empty allocation area due to termination of the service. That is, the base station changes and moves resources for the VoIP fixed allocation resource 3 530, the VoIP fixed allocation resource 5 550, and the VoIP fixed allocation resource 6 560, and the VoIP fixed allocation resource 4 540. You need to create a map IE to signal resource movement.

In order to change and move resources for fixed allocation resources, the base station uses the fixed allocation resources ACK channel bitmap to be changed and moved. That is, in order to change the VoIP fixed allocation resource 3 530, the VoIP fixed allocation resource 4 540, the VoIP fixed allocation resource 5 550, and the VoIP fixed allocation resource 6 560, As shown in 5b, the third, fourth, fifth and sixth bits in the ACK channel bitmap 502 having the values of the ACK channel numbers 1 to 8 are set to one. The base station allocates four resource allocation information codes for four fixed allocation resources corresponding to bits set to 1 in the ACK channel bitmap 502, binds the resource allocation information codes, and allocates allocation information bits. Configure the map 504. In order to prevent the empty resource zone from occurring, that is, to position the four fixed allocation resources that are changed and moved to be contiguous with the existing fixed allocation resources, the base station sets the start position of the fixed allocation resources to the VoIP failure allocation resource 1 ( The resource unit number following 510 is set. That is, the resource unit offset is five. Accordingly, the VoIP fixed allocation resource 3 530, the VoIP fixed allocation resource 4 540, the VoIP fixed allocation resource 5 550, and the corresponding bits set to 1 in the ACK channel bitmap 502. Terminals using the VoIP fixed allocation resource 6 560 are sequentially allocated resources from resource unit 5 according to allocation information codes included in the allocation information bitmap 504.

When the fixed allocation resource is changed and moved in this way, as shown in FIG. 5, the empty areas are concentrated as one, and new resources may be allocated to the areas of the resource units 22 to 29 which are empty resource areas. As shown in FIG. 5B, when 8 bits of the ACK channel bitmap 502 and 12 bits of the allocation information bitmap 504 are used, change and movement of four fixed allocation resources are represented.

Multiple resource changes and moves may be included in one resource move IE. When using separate coding, N resource movement IEs are needed for resource change for N fixed allocation resources. However, if N resource changes and movements are included in one resource movement IE, the amount of information required may be reduced. At this time, the resource movement IE including a plurality of resource changes and movements is encoded and modulated based on the resource having the worst channel condition among the N fixed allocation resources. For example, the resource movement IE is configured as shown in Table 2 below.

Syntax Size
(bits) Notes Resource Relocation IE {  Type 5  RU offset 6 Location of Fixed Allocation Resources Moved  ACK channel BITMAP 12 Bitmap indicating the ACK channel index of the fixed allocation resource to be changed or moved  Allocation Information BITMAP variable Bitmap indicating MCS level and resource allocation size after changing or moving fixed allocation resources  CRC 16 }

Since the resource movement IE is transmitted in the form of a map, the resource movement IE includes a 'type' field for identifying the type of map. An 'ACK channel BITMAP' field for notifying of the fixed allocation resource to be changed and an 'Allocation Information BITMAP' field for notifying the changed allocation information are included. In addition, a 'RU offset' field is included to inform the start position of the changed fixed allocation resources. In addition, a CRC for the resource change and mobile IE is included. At this time, the value of 'CRC' is set to a common CRC known to all terminals that should receive the resource movement IE.

Hereinafter, the present invention will be described in detail with reference to the drawings with respect to the operation and configuration of the base station and the terminal for processing the change and movement of fixed allocation resources as described above.

6 is a flowchart illustrating an operation procedure of a base station in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 6, in step 601, the base station determines whether an allocation change occurs for at least one fixed allocation resource among fixed allocation resources. In other words, the base station determines whether there is at least one fixed allocation resource whose resource amount is increased or decreased due to the MCS level change among the fixed allocated resources.

If there is at least one fixed allocation resource whose allocation is changed, the base station proceeds to step 603 to set the bit value in the ACK channel bitmap corresponding to the ACK channel number of the at least one fixed allocation resource to '1', Assign the allocation information code. That is, the base station checks the resource allocation information code corresponding to the new MCS level and resource amount of the fixed allocation resource to be changed and allocates the resource allocation information code.

In step 605, the base station determines whether an empty allocation area occurs due to the at least one fixed allocation resource that is changed. For example, when the resource amount of the fixed allocation resource decreases, an empty allocation area corresponding to the reduced resource amount occurs. If the free allocation area does not occur, the base station proceeds to step 611.

On the other hand, if an empty allocation area occurs, the base station proceeds to step 607 to identify the ACK channel number of the fixed allocation resource to be moved. In other words, the base station identifies the ACK channel number of the fixed allocation resource to be moved to remove the free allocation area. For example, the base station identifies an ACK channel number of a fixed allocation resource having a resource amount equal to the size of the empty allocation area or a fixed allocation resource having a resource amount smaller than the size of the empty allocation area.

After checking the ACK channel number of the fixed allocation resource to be moved, the base station proceeds to step 609 and sets the bit value in the ACK channel bitmap corresponding to the ACK channel number to '1' and allocates a resource allocation information code. do. At this time, the base station reassigns the resource allocation information code corresponding to the MCS level and the resource amount of the fixed allocation resource to be moved.

In step 611, the base station determines whether revocation of allocation occurs for at least one fixed allocation resource among the fixed allocation resources. If no allocation cancellation occurs, the base station proceeds to step 619.

On the other hand, if allocation cancellation occurs, the base station proceeds to step 613 and determines whether an empty allocation area occurs due to the at least one fixed allocation resource to be released. For example, if a new allocation is not made after the allocation is released, an empty allocation area is generated as much as the resource amount of the fixed allocation resource that has been released. If the free allocation area does not occur, the base station proceeds to step 619.

On the other hand, if a free allocation area occurs, the base station proceeds to step 615 to identify the ACK channel number of the fixed allocation resource to be moved. In other words, the base station identifies the ACK channel number of the fixed allocation resource to be moved to remove the free allocation area. For example, the base station identifies an ACK channel number of a fixed allocation resource having a resource amount equal to the size of the empty allocation area or a fixed allocation resource having a resource amount smaller than the size of the empty allocation area.

After confirming the ACK channel number of the fixed allocation resource to be moved, the base station proceeds to step 617 and sets the bit value in the ACK channel bitmap corresponding to the ACK channel number to '1' and allocates a resource allocation information code. do. At this time, the base station reassigns the resource allocation information code corresponding to the MCS level and the resource amount of the fixed allocation resource to be moved.

In step 619, the base station determines whether there is a bit set to 1 '' in the ACK channel bitmap. That is, the base station checks whether there is a fixed allocation resource that is changed or moved. If the bit set to '1' does not exist, the base station terminates this procedure.

On the other hand, if there is a bit set to '1', the base station proceeds to step 621 to create an allocation information bitmap by connecting at least one resource allocation code corresponding to the at least one bit set to '1' do. In other words, the base station creates the allocation information bitmap by arranging the at least one resource allocation information code in the order of at least one bit set to '1'.

In step 623, the base station calculates a start position of at least one fixed allocation resource, that is, a resource unit offset. In other words, the base station calculates a start position after the change and movement of at least one fixed allocation resource that is changed and moved.

In step 625, the base station creates a resource movement IE including the ACK channel bitmap, the allocation information bitmap, and the resource unit offset. Then, the resource movement IE is transmitted to the terminals. That is, the base station performs CRC processing of the resource movement IE with a resource movement CRC code, converts the resource movement IE into complex symbols by modulating the resource movement IE, performs an inverse fast fourier transform (IFFT) operation, and inserts a cyclic prefix (CP). After converting the complex symbols into OFDM symbols, the complex symbols are up-converted into a radio frequency (RF) band signal and transmitted through an antenna.

7 is a flowchart illustrating an operation procedure of a terminal in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 7, the terminal receives a map message in step 701. Here, the map message may include at least one of a map IE and a resource move IE, and may include a plurality of map IEs or a plurality of resource move IEs. That is, the terminal down-converts the RF band signal received through the antenna to a baseband signal, divides the baseband signal into OFDM symbol units, and removes the frequency band signal through CP elimination and fast fourier transform (FFT) operation. The signals are mapped to positions in the map message and converted into bit strings.

After receiving the map message, the terminal proceeds to step 703 and checks whether there is an IE for which CRC check succeeds in its own sequence. That is, the terminal divides the map message into IE units, and CRC checks each of IEs in its own sequence. In addition, the terminal checks whether there is a map IE that does not generate an error as a result of the CRC test, that is, whether there is a map IE for itself. If there is no IE that is successful in CRC checking using its own sequence, the terminal proceeds to step 707.

On the other hand, if there is a map IE successful in CRC checking using its CRC code, the terminal proceeds to step 705 and checks resource allocation information for itself. In other words, the terminal determines the successful map IE using the CRC code of the map IE as the map IE for itself, and checks the resource allocation information included in the map IE for the self.

Thereafter, the terminal proceeds to step 707 and checks whether there is an IE whose CRC check succeeds with the resource movement CRC code. That is, the terminal divides the map message into IE units, and CRC checks each of the IEs using the resource movement CRC code. The terminal checks whether there is an IE that does not generate an error as a result of the CRC check, that is, whether there is a resource movement IE. If there is no IE for which CRC check succeeds using the resource movement CRC code, the terminal proceeds to step 711.

On the other hand, if there is a map IE that is successful in CRC checking using a resource movement CRC code, the terminal proceeds to step 709 and checks the change and movement information of the fixed allocation resource. In other words, the terminal determines a map IE that is successful in CRC checking using a resource movement CRC code as a resource movement map IE indicating a change and movement of a fixed allocation resource, and determines allocation change and movement information included in the resource movement map IE. Check it. For example, the resource movement IE is configured as shown in Table 2. That is, the terminal identifies the fixed allocation resource to be changed or moved through the ACK channel bitmap, checks the MCS level and resource amount after the change through the allocation information bitmap, and identifies the start position of the fixed allocated resource to be changed or moved. Check it.

Thereafter, the terminal proceeds to step 711 and performs communication according to the checked resource allocation information or the confirmed change and movement information of the fixed allocation resource. That is, when there is resource allocation information for itself, the terminal receives data through the newly allocated resource indicated by the resource allocation information. In addition, when there is allocation change or movement information, the terminal checks whether the resource to be changed or moved is a resource allocated to the terminal, and if the resource is allocated to the terminal, receives the data through the changed or moved resource.

8 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. 8, the base station includes a resource allocator 802, a map generator 804, a map encoder 806, a data buffer 808, and a data encoder 810. And a symbol modulator 812, a subcarrier mapper 814, an OFDM modulator 816, and an RF transmitter 818.

The resource allocator 802 allocates resources to terminals accessing the base station. In this case, the resource allocator 802 performs resource allocation for each subframe. That is, the resource allocator 802 allocates resources according to a fixed allocation method or a general allocation method. In this case, a change, cancellation or movement of the fixed allocation resource may occur. In particular, when an empty resource region occurs due to resource change and resource release of fixed allocation resources, the resource allocator 802 removes the empty resource region by moving the fixed allocation resources. Alternatively, the resource allocator 802 adds a new allocation to the empty resource region generated by the change or movement of the fixed allocation resource.

The map generator 804 generates a map message for notifying the resource allocation result of the resource allocator 802. Here, the map message may include at least one of a map IE and a resource move IE, and may include a plurality of map IEs or a plurality of resource move IEs. At this time, the map IE and the resource movement IE is in accordance with the IE configuration in advance. For example, the resource movement IE is configured as shown in Table 2. That is, when a change or movement of the fixed allocation resource occurs, the map generator 804 determines the ACK channel bitmap that identifies the fixed allocation resource to be changed or moved, the allocation information bitmap indicating the MCS level and resource amount after the change, or A resource movement IE is created that includes a resource unit offset indicating a position after the movement. At this time, the map generator 804 sets the bit value in the ACK channel bitmap corresponding to the ACK channel number of the at least one fixed allocation resource to be changed or moved to '1', and allocates at least one resource allocation information code. do. The map generator 804 then creates an allocation information bitmap by concatenating the at least one resource allocation code.

The map encoder 806 performs CRC processing on the map IE and the resource movement IE with a corresponding CRC code. That is, the map encoder 806 performs CRC processing on the map IE as a unique sequence of a terminal which is a destination of the map IE, and performs CRC processing on the resource movement IE with a resource movement CRC code. Accordingly, the map IE can be decoded only by the terminal which is the destination of the map IE, and the resource movement IE can be decoded by all terminals that know the resource movement CRC code.

The data buffer 808 stores data to be transmitted to the terminals, and provides the stored data to the data encoder 810 according to the resource allocation result of the resource allocator 802. The data encoder 810 performs channel coding on the data bit stream provided from the data buffer 808. The symbol modulator 812 demodulates the channel coded bit string and converts the bit coded signal into complex symbols. The subcarrier mapper 814 maps the complex symbols to the frequency domain according to the resource allocation result of the resource allocator 802. The OFDM modulator 816 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 818 upconverts the baseband signal into an RF band signal and transmits the signal through an antenna.

9 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. 9, the terminal includes an RF receiver 902, an OFDM demodulator 904, a subcarrier mapper 906, a symbol demodulator 908, a data decoder 910, and a map decoder ( and a map decoder 912, a map interpreter 914, and a resource status manager 916.

The RF receiver 902 downconverts an RF band signal received through an antenna to a baseband signal. The OFDM demodulator 904 divides a signal provided from the RF receiver 902 in OFDM symbol units, removes a CP, and restores complex symbols mapped to a frequency domain through an FFT operation. The subcarrier demapper 906 extracts a signal mapped to a resource allocated to the terminal among complex symbols mapped to a frequency domain. The symbol demodulator 908 converts the complex symbols into a bit string by demodulating the complex symbols. The symbol demodulator 908 provides an encoded bit string of data to the data decoder 910 and a bit string of a map message to the map decoder 912. The data decoder 910 restores the data bit stream by channel decoding the bit stream provided from the symbol demodulator 908.

The map decoder 912 divides the bit string of the map message into IE units, and classifies a map IE for the terminal from among IEs and a resource movement IE indicating a resource change. In other words, the map decoder 912 CRC checks each of the IEs in a unique sequence of the terminal, and determines that the IE does not generate an error as a map IE for the terminal. The map decoder CRC checks each of the IEs using the resource move CRC code, and determines that the IE does not generate an error as a resource move IE as a result of the CRC check.

The map interpreter 914 checks resource allocation information included in the map IE for the terminal identified by the map decoder 912 and resource change information included in the resource movement IE. In other words, the map interpreter 914 checks the newly allocated resource through the map IE according to the previously promised IE format, and confirms the change information of the fixed allocated resource through the resource movement IE. For example, the resource movement IE is configured as shown in Table 2. That is, the map interpreter 914 identifies the fixed allocation resource that is changed or moved through the ACK channel bitmap, checks the MCS level and resource amount after the change or movement through the allocation information bitmap, and changes it through the resource unit offset. Or check the location of the fixed allocation resource to be moved.

The resource status manager 916 manages the status of resources allocated to the terminal according to the resource allocation information and the resource change information identified by the map interpreter 914. The resource status manager 916 controls the subcarrier mapper 906 to extract a signal received through the resource allocated to the terminal. In particular, when a resource movement IE is received, the resource status manager 916 checks whether a resource to be changed or moved is a fixed allocation resource of the terminal, and if it is a fixed allocation resource of the terminal, updates the resource status information.

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 fixed allocation of resource release in a broadband wireless communication system;

2 is a diagram illustrating an example of a fixed allocated resource change in a broadband wireless communication system;

3 is a diagram illustrating an example of a fixed allocated resource change in a broadband wireless communication system;

4 is a diagram illustrating an example of a frame structure in a broadband wireless communication system according to the present invention;

5A illustrates an example of changing and moving fixed allocated resources in a broadband wireless communication system according to the present invention;

5B is a diagram illustrating an example of an ACK (ACKnowledge) channel bitmap and allocation information bitmap according to the change and movement of fixed allocated resources in a broadband wireless communication system according to the present invention;

6 is a flowchart illustrating an operation procedure of a base station in a broadband wireless communication system according to an embodiment of the present invention;

7 is a view illustrating an operation procedure of a terminal in a broadband wireless communication system according to an embodiment of the present invention;

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

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

Claims (16)

A method of operating a base station in a broadband wireless communication system, Generating a resource movement information element (IE) for identifying the at least one fixed allocation resource by using an ACK (ACKnowledge) channel number when at least one fixed allocation resource change or movement occurs; Transmitting the resource movement IE. The method of claim 1, The resource movement IE is composed of bits corresponding to ACK channel numbers of fixed allocation resources in a subframe, and indicates whether to change or move according to the value of each of the bits. An allocation information bitmap indicating a Modulation and Coding Scheme (MCS) level and amount of resources after the change or movement of at least one fixed allocation resource, and a start position after the change or movement of the at least one fixed allocation resource And at least one of a resource unit offset. The method of claim 2, The process of generating the resource movement IE, Setting a bit value in the ACK channel bitmap corresponding to the ACK channel number of the at least one fixed allocation resource to '1'; Allocating at least one resource allocation information code corresponding to the MCS level and the amount of resources after the change or movement of the at least one fixed allocation resource; And concatenating said at least one resource allocation information code to create said allocation information bitmap. The method of claim 1, The process of transmitting the resource movement IE, CRC processing the resource movement IE using a resource movement Cyclic Redundancy Check (CRC) code. The method of claim 1, And moving the at least one fixed allocated resource to remove the empty resource region when the empty resource region occurs due to the change or movement. In the method of operating a terminal in a broadband wireless communication system, If a resource movement IE (Information Element) is included in the received map message, checking the change or movement information of the fixed allocation resource through the resource movement IE; And restoring data by decoding a signal received through the resource of the moved position if the resource moved by the change or movement information is a resource allocated thereto. The method of claim 6, The resource movement IE is composed of bits corresponding to ACK channel numbers of fixed allocation resources in a subframe, and indicates whether to change or move according to the value of each of the bits. An allocation information bitmap indicating a Modulation and Coding Scheme (MCS) level and amount of resources after the change or movement of at least one fixed allocation resource, and a start position after the change or movement of the at least one fixed allocation resource And at least one of a resource unit offset. The method of claim 6, CRC checking each of the IEs included in the map message using a resource movement cyclic redundancy check (CRC) code; Determining that the CRC check succeeded IE is the resource movement IE. A base station apparatus in a broadband wireless communication system, A generator for generating a resource movement information element (IE) for identifying the at least one fixed allocation resource by using an ACK (ACKnowledge) channel number when at least one fixed allocation resource change or movement occurs; And a transmitter for transmitting said resource movement IE. 10. The method of claim 9, The resource movement IE is composed of bits corresponding to ACK channel numbers of fixed allocation resources in a subframe, and indicates whether to change or move according to the value of each of the bits. An allocation information bitmap indicating a Modulation and Coding Scheme (MCS) level and amount of resources after the change or movement of at least one fixed allocation resource, and a starting position after the change or movement of the at least one fixed allocation resource; And at least one of a resource unit offset. The method of claim 10, The generator sets the bit value in the ACK channel bitmap corresponding to the ACK channel number of the at least one fixed allocation resource to '1', and changes the MCS level and the resource amount after the change or movement of the at least one fixed allocation resource. And allocating at least one resource allocation information code, and then connecting the at least one resource allocation information code to create the allocation information bitmap. 10. The method of claim 9, And an encoder for CRC processing the resource movement IE using a resource movement cyclic redundancy check (CRC) code. 10. The method of claim 9, And an allocator for moving at least one fixed allocation resource to remove the empty resource region when the empty resource region occurs due to the change or movement. A terminal device in a broadband wireless communication system, An interpreter for identifying a change or movement information of a fixed allocation resource through the resource movement IE when the resource movement IE is included in the received map message; And a data decoder for restoring data by decoding a signal received through the resource of the moved position if the resource moved by the change or movement information is a resource allocated thereto. The method of claim 14, The resource movement IE is composed of bits corresponding to ACK channel numbers of fixed allocation resources in a subframe, and indicates whether to change or move according to the value of each of the bits. An allocation information bitmap indicating a Modulation and Coding Scheme (MCS) level and amount of resources after the change or movement of at least one fixed allocation resource, and a start position after the change or movement of the at least one fixed allocation resource And at least one of a resource unit offset. The method of claim 14, And a map decoder for CRC checking each of the IEs included in the map message using a resource shifting cyclic redundancy check (CRC) code, and determining that the IE for which the CRC check is successful is the resource shifting IE. Device.

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