KR20100044695A - Method and apparatus of mapping resource unit in wireless communication system - Google Patents

Abstract

PURPOSE: A resource unit mapping method in a wireless communications system and a device thereof are provided to select radio resources to be allocated to at least one FP from wireless resources allocated to sub bands and mini bands. CONSTITUTION: A processor(910) obtains the number of sub bands and mini bands in each FP. The processor maps sub band PRU(Physical Resource Unit) and mini band PRU with each FP by PRU set unit. A PRU set includes PRUs whose number is same as the number of multiple adjacent PRUs. An RF unit(920) is connected with the processor. The RF unit transmits or receives a wireless signal.

Description

Resource unit mapping method and apparatus in wireless communication system {METHOD AND APPARATUS OF MAPPING RESOURCE UNIT IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to wireless communication, and more particularly, to a method and apparatus for mapping a resource unit in a wireless communication system.

The Institute of Electrical and Electronics Engineers (IEEE) 802.16e standard is the sixth standard for the International Mobile Telecommunications (IMT-2000) in the ITU-Radiocommunication Sector (ITU-R) under the International Telecommunication Union (ITU) in 2007. It was adopted under the name OFDMA TDD '. ITU-R is preparing the IMT-Advanced system as the next generation 4G mobile communication standard after IMT-2000. The IEEE 802.16 Working Group (WG) decided to implement the 802.16m project at the end of 2006 with the aim of creating an amendment specification of the existing IEEE 802.16e as a standard for the IMT-Advanced system. As can be seen from the above objectives, the 802.16m specification implies two aspects: past continuity of modification of the 802.16e specification and future continuity of specification for next generation IMT-Advanced system. Accordingly, the 802.16m standard requires all the advanced requirements for the IMT-Advanced system to be maintained while maintaining compatibility with the Mobile WiMAX system based on the 802.16e standard.

One of the systems considered in the next generation wireless communication system is an Orthogonal Frequency Division Multiplexing (OFDM) system that can attenuate inter-symbol interference (ISI) effects with low complexity. OFDM converts serially input data symbols into N parallel data symbols and transmits the data symbols on N subcarriers. The subcarriers maintain orthogonality in the frequency dimension. Each orthogonal channel experiences mutually independent frequency selective fading, and the interval between transmitted symbols is increased, thereby minimizing intersymbol interference. Orthogonal Frequency Division Multiple Access (OFDMA) refers to a multiple access method for realizing multiple access by independently providing each user with a portion of available subcarriers in a system using OFDM as a modulation method. OFDMA provides each user with a frequency resource called a subcarrier, and each frequency resource is provided to a plurality of users independently so that they do not overlap each other. Eventually, frequency resources are allocated to each other exclusively.

In an OFDMA system, frequency diversity scheduling can be obtained through frequency selective scheduling, and subcarriers can be allocated in various forms according to permutation schemes for subcarriers. In addition, the spatial multiplexing technique using multiple antennas can increase the efficiency of the spatial domain.

Meanwhile, radio resources may be divided into a plurality of frequency partitions (FPs) when providing a service such as multicast and broadcast services (MBS). This is called fractional frequency reuse (FFR), and each frequency segment may be used for a different purpose. Within each frequency division, distributed subchannels and localized subchannels may coexist in Frequency Division Multiplexing (FDM). In addition, each frequency partition may allocate a subchannel based on resource units (granularity) having different sizes. Therefore, when allocating subchannels, various factors need to be considered, and trade-off according to various factors must also be considered.

There is a need for an efficient resource unit mapping method among subchannel allocation methods.

An object of the present invention is to provide a resource unit mapping method and apparatus in a wireless communication system.

In one aspect, a method of resource unit mapping in a wireless communication system is provided. The method obtains the number (FPCT) of frequency partitions (FPCT), the size (FPS) of FPi (i> 0) and the number (FPSC) of subbands (SB) of FPi (i>0); Where FPi is the number of subbands (K _{SB , FPi} ) and minibands (MB; miniband) of each FP based on the i th FP), the FPCT, the FPS, and the FPSC (K _{MB , FPi} ). Acquiring, and subband PRUs (PRU _SB ) including a plurality of contiguous PRUs based on the K _{SB , FPi} and K _{MB , FPi} and mini-band PRUs (PRU _MB ) including a plurality of contiguous PRUs. The PRU set includes the same number of PRUs as the number of the plurality of adjacent PRUs included in one subband. The mapping of the PRU _MB in each FP above in PRU in Set, the presentation permutation the PRU _MB as PRU unit comprise mapped to PPRU _MB, and mapped to each FP above the PPRU _MB to the PRU in Set Can be. In addition, the FPCT, the FPS, and the FPSC may be broadcast and may vary according to bandwidth.

In another aspect, a method of data transmission in a wireless communication system is provided. The method maps some of the PRU _FPi , which is a logical resource included in the i th frequency partition (FPi), to the PRU _SB , maps the PRU _SB , maps the remaining PRU _FPi to the PRU _MB , and the PRU _SB or the PRU. Mapping a _MB to a PRU, which is a physical radio resource in units of PRU sets, and transmitting data through the PRU, wherein the PRU _SB is assigned at least one subband including a plurality of adjacent PRUs, and the PRU At least one miniband including a plurality of contiguous PRUs is allocated to the _MB , and the PRU set may include the same number of PRUs as the number of the contiguous PRUs included in one subband. In addition, mapping the remaining PRU _FPi to PRU _{MB may} include mapping the remaining PRU _FPi to PPRU _MB , permuting the PPRU _MB to PRU _MB .

In another aspect, a terminal is provided in a wireless communication system. The terminal includes a processor; And an RF unit connected to the processor, wherein the processor acquires the number of FPs (FPCT), the size (FPS) of FPi (i> 0) and the number of subbands (FPSC) of FPi (i> 0), Based on the FPCT, the FPS and the FPSC, the number of subbands (K _{SB , FPi} ) and the number of _minibands (K _{MB , FPi} ) of each FP are obtained, and the K _{SB , FPi} and K _{MB , FPi} are obtained. A subband PRU (PRU _{SB )} including a plurality of contiguous PRUs and a minband PRU (PRU _MB ) including a plurality of contiguous PRUs are mapped to the respective FPs in units of PRU sets, wherein the PRU set is one It includes the same number of PRUs as the number of the plurality of adjacent PRUs included in the subband.

Selecting a radio resource to be allocated to one or more frequency partitions (FP) from each of the radio resources allocated to subbands (SBs) and minibands (MBs) and minibands (MBs), respectively. Frequency diversity gain based on scheduling gain and mini band can be obtained.

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various wireless communication systems. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), or the like. IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is part of Evolved UMTS (E-UMTS) using Evolved-UMTS Terrestrial Radio Access (E-UTRA), which employs OFDMA in downlink and SC in uplink -FDMA is adopted. LTE-A (Advanced) is the evolution of 3GPP LTE.

For clarity, the following description focuses on IEEE 802.16m, but the technical spirit of the present invention is not limited thereto.

1 shows a wireless communication system. The wireless communication system 10 includes at least one base station (BS) 11. Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c. The cell may again be divided into multiple regions (referred to as sectors). The UE 12 may be fixed or mobile, and may have a mobile station (MS), a mobile terminal (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a PDA ( Other terms may be referred to as a personal digital assistant, a wireless modem, a handheld device, etc. The base station 11 generally refers to a fixed station that communicates with the terminal 12. It may be called other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point.

The UE belongs to one cell, and the cell to which the UE belongs is called a serving cell. A base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell. A base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are relatively determined based on the terminal.

This technique can be used for downlink or uplink. In general, downlink means communication from the base station 11 to the terminal 12, and uplink means communication from the terminal 12 to the base station 11. In downlink, the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12. In uplink, the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.

2 shows an example of a frame structure.

Referring to FIG. 2, a superframe (SF) includes a superframe header (SFH) and four frames (frames, F0, F1, F2, and F3). Each frame in the superframe may have the same length. The size of each superframe is 20ms and the size of each frame is illustrated as 5ms, but is not limited thereto. The length of the superframe, the number of frames included in the superframe, the number of subframes included in the frame, and the like may be variously changed. The number of subframes included in the frame may be variously changed according to a channel bandwidth and a length of a cyclic prefix (CP).

The superframe header may carry essential system parameters and system configuration information. The superframe header may be located in the first subframe in the superframe. The superframe header may be classified into primary SFH (P-SFH) and secondary SFH (S-SFH; secondary-SFH). P-SFH and S-SFH may be transmitted every superframe.

One frame includes a plurality of subframes (subframe, SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7). Each subframe may be used for uplink or downlink transmission. One subframe includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of subcarriers in the frequency domain. An OFDM symbol is used to represent one symbol period, and may be called another name such as an OFDMA symbol, an SC-FDMA symbol, and the like according to a multiple access scheme. The subframe may be composed of 5, 6, 7, or 9 OFDM symbols, but this is only an example and the number of OFDM symbols included in the subframe is not limited. The number of OFDM symbols included in the subframe may be variously changed according to the channel bandwidth and the length of the CP. A type of a subframe may be defined according to the number of OFDM symbols included in the subframe. For example, the type-1 subframe may be defined to include 6 OFDM symbols, the type-2 subframe includes 7 OFDM symbols, the type-3 subframe includes 5 OFDM symbols, and the type-4 subframe includes 9 OFDM symbols. have. One frame may include subframes of the same type. Alternatively, one frame may include different types of subframes. That is, the number of OFDM symbols included in each subframe in one frame may be all the same or different. Alternatively, the number of OFDM symbols of at least one subframe in one frame may be different from the number of OFDM symbols of the remaining subframes in the frame.

A time division duplexing (TDD) scheme or a frequency division duplexing (FDD) scheme may be applied to the frame. In the TDD scheme, each subframe is used for uplink transmission or downlink transmission at different times at the same frequency. That is, subframes in a frame of the TDD scheme are classified into an uplink subframe and a downlink subframe in the time domain. In the FDD scheme, each subframe is used for uplink transmission or downlink transmission at different frequencies at the same time. That is, subframes in the frame of the FDD scheme are divided into an uplink subframe and a downlink subframe in the frequency domain. Uplink transmission and downlink transmission occupy different frequency bands and may be simultaneously performed.

The subframe includes a plurality of physical resource units (PRUs) in the frequency domain. The PRU is a basic physical unit for resource allocation and is composed of a plurality of OFDM symbols consecutive in the time domain and a plurality of subcarriers consecutive in the frequency domain. The number of OFDM symbols included in the PRU may be equal to the number of OFDM symbols included in one subframe. Thus, the number of OFDM symbols in the PRU may be determined according to the type of subframe. For example, when one subframe consists of 6 OFDM symbols, the PRU may be defined with 18 subcarriers and 6 OFDM symbols.

 Logical Resource Units (LRUs) are basic logical units for distributed resource allocation and contiguous resource allocation. The LRU is defined by a plurality of OFDM symbols and a plurality of subcarriers and includes pilots used in a PRU. Thus, the appropriate number of subcarriers in one LRU depends on the number of pilots assigned.

Distributed Resource Units (DRUs) may be used to obtain frequency diversity gain. The DRU includes subcarrier groups distributed in one frequency partition. The size of the DRU is equal to the size of the PRU. The smallest unit that forms a DRU is one subcarrier. A Distributed Logical Resource Unit (DLRU) may be obtained by performing subcarrier permutation on the DRU.

Contiguous Resource Units (CRUs) may be used to obtain frequency selective scheduling gains. The CRU includes a local subcarrier group. The size of the CRU is equal to the size of the PRU. Contiguous Logical Resource Units (CLRUs) may be obtained by direct mapping of the CRUs.

Meanwhile, in a cellular system in which multi-cells exist, a fractional frequency reuse (FFR) technique may be used. The FFR technique divides an entire frequency band into a plurality of frequency partitions (FPs) and allocates a portion of the frequency partitions to each cell. Different frequency partitions may be allocated between adjacent cells through the FFR scheme, and the same frequency partition may be allocated between distant cells. Accordingly, inter-cell interference (ICI) may be reduced, and performance of a cell edge terminal may be improved.

3 shows an example of a method of dividing an entire frequency band into a plurality of frequency divisions.

Referring to FIG. 3, the entire frequency band is divided into a first frequency section FP0, a second frequency section FP1, a third frequency section FP2, and a fourth frequency section FP3. Each frequency partition may be divided logically and / or physically from the entire frequency band.

4 shows an example of a cellular system in which the FFR technique is used.

Referring to FIG. 4, each cell is divided into an inner cell and a cell edge. In addition, each cell is divided into three sectors. The entire frequency band is divided into three frequency sections FP1, FP2, and FP3, and the first frequency section FP0 includes the second frequency section FP1, the third frequency section FP2, and the fourth frequency section FP3. Assume that is a sum of all the frequency partitions. That is, the first frequency section FP0 is equal to the entire frequency band.

The first frequency partition FP0 is allocated inside the cell. Each sector at the cell edge is assigned one of the second frequency partition FP1 to the fourth frequency partition FP3. In this case, different frequency partitions are allocated between adjacent cells. Hereinafter, the assigned frequency section is referred to as an active frequency section and the unassigned frequency section is referred to as an inactive frequency section. For example, when the second frequency section FP1 is assigned, the second frequency section is the active frequency section, and the third frequency section FP2 and the fourth frequency section FP3 become the inactive frequency section.

The frequency reuse factor (FRF) may be defined as how many cells (or sectors) the entire frequency band can be divided into. In this case, the frequency reuse coefficient inside the cell may be 1, and the frequency reuse coefficient of each sector at the cell edge may be 3.

5 shows an example of a downlink resource structure.

Referring to FIG. 5, the downlink subframe may be divided into at least one frequency partition. Here, the subframe is divided into two frequency partitions (FP1, FP2) by way of example, but the number of frequency partitions in the subframe is not limited thereto. Each frequency block may be used for other purposes such as FFR.

Each frequency partition consists of at least one PRU. Each frequency partition may include distributed resource allocation and / or contiguous resource allocation. Here, the second frequency partition FP2 includes distributed resource allocation and continuous resource allocation. 'Sc' means a subcarrier.

Meanwhile, the radio resource may be subchannelized and divided into several subchannels as necessary. The subchannel may include a distributed subchannel and a contiguous subchannel. The distributed subchannel may be the DLRU, and the continuous subchannel may be the CLRU. Subchannelization allows subcarriers in an LRU to spread over the entire bandwidth.

When applying subchannelization, the following matters should be considered.

1) Performance of DLRU and CLRU

2) Reduced signaling overhead and channel quality indicator (CQI) overhead

3) flexibility between distributed and local resources

4) Ease of expansion based on bandwidth

5) Simplicity of designing the allocation sequence

6) Flexibility according to FFR configuration

6 shows an example of a subchannelization process. Referring to FIG. 6, subchannelization is performed as follows.

1) Outer permutation is performed on the PRU. External permutation refers to matching the PRU with each frequency block. External permutation is applied in at least one PRU granularity. External permutation may be performed in units of N ₁ or N ₂ PRUs (wherein N ₁ > N ₂ ), and N ₁ and N ₂ may vary according to bandwidth. However, for efficient external permutation, N ₁ needs to be an integer multiple of N ₂ . External permutation divides PRUs into subband PRUs ( _SBs ) and miniband PMBs (PRUs _MBs ), such as subband partitioning and miniband permutation. And, it may mean a process of performing permutation of the PRU unit for the mini-band PRU. The PRU _SB is the PRU to be allocated to the subbands, and the PRU _MB is the PRU to be allocated to the minibands. Subbands are suitable for frequency selective allocation because they use consecutive PRUs on frequency, and minibands are suitable for frequency diversity allocation.

In addition, the number of subbands having a granularity of N ₁ in all radio resources may be _referred to as K _SB . When considering the FFR, the information about K _SB needs to have the same value between cells. In this case, information about the K _SB may be shared through signaling between cells, and a value may be previously determined according to a bandwidth. In addition, radio resources may be allocated for each cell when FFR is considered when performing external permutation, and radio resources may be allocated differently for each cell when FFR is not considered. The information about the K _SB may be broadcasted from the base station to the terminal, and when broadcasted, may be transmitted through a broadcast channel (BCH) or a super frame header (SFH).

2) Distribute the rearranged PRUs to one or more frequency partitions. This step may be omitted by being included in the external permutation of 1) or may be performed by broadcast frequency partition information. One frequency partition includes both granularities of N ₁ and N ₂ , and a reuse region may have the same meaning as a frequency partition. Alternatively, one frequency partition includes only one granularity, and each reuse region may include a plurality of frequency partitions having different granularities of N ₁ and N ₂ .

3) The frequency partition is divided into a CRU and a DRU for each resource. N ₁ at the split Or divided into granularity units of N ₂ . That is, if each frequency partition includes one granularity, it may be divided into each frequency partition, and if each frequency partition includes different granularity, it may be divided into respective granularity units. In addition, sector specific permutation may be supported, and direct mapping of resources may be supported for continuous resources. The size of distributed / continuous resources can be set flexibly for each sector.

4) Contiguous and distributed groups are mapped to LRUs.

Inner permutation (or subcarrier permutation) defined for distributed resource allocation within one frequency partition allows the subcarriers of the distributed resource unit to spread within the entire distributed resource. The internal permutation may be performed based on subcarriers or tiles. The granularity of the internal permutation is equal to the minimum unit forming the distributed resource unit. Subchannelization for distributed resources spreads the subcarriers of the LRU of the entire distributed resource.

There is no internal permutation of consecutive resource allocations. PRUs are directly mapped to contiguous resource units within each frequency partition.

Hereinafter, the proposed resource unit mapping method will be described through embodiments.

The radio resource is divided into a PRU _SB and a PRU _MB . The PRU _SB consists of K _SB subbands, and the PRU _MB consists of K _MB minibands. The PRU _MB may be permuted once more to form a PPRU _MB . Subbands constituting the PRU _SB and minibands constituting the plurality of PRU _MBs may be allocated to one or more FPs. Basically, one FP is allocated, and the maximum number of FPs may be four. Hereinafter, the i-th FP will be expressed as FPi. The remaining FPs other than FP0 may include the same number of PRUs.

7 shows an embodiment of the proposed resource unit mapping method.

In step S100, the UE acquires the number of FPs, the size of FPi having i> 0 and the number of subbands of FPi having i> 0.

The number of the FP, the size of the FPi with i> 0 and the number of subbands with the FPi with i> 0 may be obtained by receiving information about a frequency partition configuration (FPC). The FPC may be broadcast and may have a size of 12 bits. The first two bits may carry a Frequency Partition Count (FPCT) field, which is information about the number of FPs. The next 6 bits may carry a frequency partition size (FPS) field, which is information about the number of PRUs allocated to FPi having i> 0. Therefore, the number of PRUs included in FP0 can be obtained by subtracting the sum of PRUs of FPi whose i> 0 in all PRUs. The remaining 4 bits may carry a Subband Count (SC) field, which is information about the number of subbands allocated to FPi having i> 0. Therefore, the number of subbands of FP0 can be obtained by subtracting the sum of the number of subbands of FPi whose i> 0 in K _SB . Also, in general, FP0 may be considered as a primary FP such as transmitting a control signal. In this case, that is, the number of subbands included in FP0 may be specified and signalled.

Alternatively, the FPCT and the FPS may be obtained by mapping to predetermined configuration information of the FPC. That is, the FPCT and the FPS may be obtained by presetting a specific case which is frequently used among the various cases of the FPCT and the FPS as configuration information and receiving the configuration information. The configuration information may have a size of 3 or 4 bits depending on the bandwidth and may also be broadcast.

Table 1 shows an example of the relationship between the downlink frequency partition configuration (DFPC) and FPCT and FPS at 5MHz. The DFPC means FPC in downlink.

Referring to Table 1, for each DFPC, the ratio of the size of the FPCT and each FP, the number of PRUs included in each FP, and the like are mapped. FPi with i> 0 contains the same number of PRUs. For example, if the DFPC is 2, each FP has the same size and therefore contains the same number of PRUs.

Table 2 shows an example of the relationship between the number of DFPC and FP and the size of each FP at 10MHz.

Table 3 shows an example of the relationship between the number of DFPC and FP and the size of each FP at 20MHz.

When FPCT and FPS are acquired using the configuration information, the number of subbands of FPi having i> 0 needs to be separately obtained. The terminal may receive a FPSC or downlink frequency partition subband count (DFPSC). The DFPSC means FPSC in downlink. The DFPSC may have a size of 1 to 3 bits depending on the number of subbands.

In step S110, the UE acquires the number of subbands and the number of minibands of each FP based on the FPCT, the FPS, and the FPSC.

When the number of subbands included in FPi is K _{SB and FPi} , K _{SB and FPi} may be determined by Equation 1.

In Equation 1, i> 0 FPi is allocated subbands by the number of the obtained FPSCs, and FP0 is allocated the remaining subbands by subtracting K _SB by multiplying the number of FPSCs and i> 0 frequency divisions. .

Further, when the number of the mini-band contained in FPi K _MB, La _FPi K _{MB, FPi} may be determined by the following expression (2).

In Equation 2, N ₁ is the number of PRUs included in one subband, and N ₂ is the number of PRUs included in one miniband. Referring to Equation 2, subbands are allocated to FPi having i> 0 and minibands are allocated to the remaining PRUs, and FP0 has the number of minibands allocated to FPi having i> 0 and i> 0 at K _MB . The remaining minibands are allocated by subtracting the number of frequency partitions.

Equation 2 may be simply expressed as Equation 3.

In step S120, a subband PRU (PRU _SB ) including a plurality of contiguous PRUs and a miniband PRU (PRU _MB ) including a plurality of contiguous PRUs based on the K _{SB , FPi,} and K _{MB , FPi} . To each FP. The PRU set may include the same number of PRUs as the number of the plurality of adjacent PRUs included in one subband. In mapping the PRU _MB to each FP in units of PRU sets, the PRU _MBs may be permutated in units of PRUs to be mapped to PPRU _MBs first, and the PPRU _MBs may be mapped to each FP in units of the PRU sets.

The mapping may be determined by Equation 4. PRU _FPi (j) means the index of the j-th PRU of the i-th FP.

PRU _SB (k ₁₎ denotes a k ₁ beonjjae RPU of _{PRU SB, PPRU MB (k 2} ) represents a k ₂ beonjjae PRU of PPRU _MB. L _{SB and FPi} are the number of PRUs allocated to the subbands of FPi and can be expressed as L _{SB , FPi} = K _{SB , and FPi} × N ₁ . L _{MB and FPi} are the number of PRUs allocated to the miniband of _FPi and can be expressed as L _{MB, FPi} = K _{MB, FPi} × N ₂ .

Meanwhile, k ₁ and k ₂ may be determined by equations (5) and (6).

Referring to Equations 4 to 6, in each FP, a PRU _SB is allocated first, followed by a PRU _MB . The indexing order for the logical regions may also be the same as the allocation order.

8 shows an example of a radio resource configuration by the proposed resource unit mapping method. In this embodiment, the bandwidth is 10 MHz, K _SB = 7, FPCT = 4, FPS = 12, FPSC = 2, N ₁ = 4, N ₂ = 1. The total radio resource is made up of 48 PRUs, and since K _SB = 7, the number of subbands that can be allocated in all radio resources is seven. The radio resource is divided into four FPs, and each FP includes 12 PRUs. By FPSC = 2, FP1 to FP3 include two subbands, so that FP0 includes one subband. Also, FP1 to FP3 include four minibands, and FP0 includes eight minibands.

Hereinafter, a method of transmitting data using the above-described resource unit mapping method will be described.

9 shows an embodiment of the proposed data transmission method.

In step S200, the UE maps some of the PRU FPi, which is a logical resource included in the _FPi , to the PRU _SB .

In step S210, the UE maps the PRU _SB and maps the remaining PRU _FPi to PRU _MB . In mapping the PRU _FPi to a PRU _MB , the PRU _FPi may first be mapped to a PPRU _MB , and the PPRU _MB may be permutated to the PRU _MB .

Meanwhile, in mapping the PRU _FPi to the PRU _SB or the PRU _MB , the PRU _FPi may be mapped by the equations 4 to 6 using the parameters obtained by the equations 1 to 3. The PRU _SB is assigned at least one subband including a plurality of contiguous PRUs, and the PRU _MB is assigned at least one miniband including a plurality of contiguous PRUs. In addition, the PRU set may include the same number of PRUs as the number of the plurality of adjacent PRUs included in one subband.

In step S220, the UE maps the PRU _SB or the PRU _MB to PRUs, which are physical radio resources, in units of PRU sets.

In step S230, the terminal transmits data through the PRU.

10 is a block diagram illustrating a terminal in which an embodiment of the present invention is implemented.

The terminal 900 includes a processor 910 and an RF unit 920. Processor 910 implements the proposed functions, processes, and / or methods.

The processor 910 obtains the number of FPs (FPCT), the size of FPi (FPS) of i> 0 and the number of subbands (FPSC) of FPi of i> 0, and based on the FPCT, the FPS and the FPSC Subband PRUs including the number of subbands KSB and FPi and the number of minibands KMB and FPi of each FP and a plurality of adjacent PRUs based on the KSB, FPi and KMB and FPi And a miniband PRU (PRUMB) including a plurality of contiguous PRUs (PRUMB) to each FP in units of PRU sets, wherein the PRU set is equal to the number of the plurality of contiguous PRUs included in one subband. May include PRUs. The RF unit 920 is connected to the processor 910 to transmit and / or receive a radio signal.

The processor 910 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and / or a data processing device. The RF unit 920 may include a baseband circuit for processing a radio signal. When the embodiment is implemented in software, the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function. The module may be executed by the processor 910.

In the exemplary system described above, the methods are described based on a flowchart as a series of steps or blocks, but the invention is not limited to the order of steps, and certain steps may occur in a different order or concurrently with other steps than those described above. Can be. In addition, those skilled in the art will appreciate that the steps shown in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the present invention.

The above-described embodiments include examples of various aspects. While not all possible combinations may be described to represent the various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, the invention is intended to embrace all other replacements, modifications and variations that fall within the scope of the following claims.

1 shows a wireless communication system.

2 shows an example of a frame structure.

3 shows an example of a method of dividing an entire frequency band into a plurality of frequency divisions.

4 shows an example of a cellular system in which the FFR technique is used.

5 shows an example of a downlink resource structure.

6 shows an example of a subchannelization process.

7 shows an embodiment of the proposed resource unit mapping method.

8 shows an example of a radio resource configuration by the proposed resource unit mapping method.

9 shows an embodiment of the proposed data transmission method.

10 is a block diagram illustrating a terminal in which an embodiment of the present invention is implemented.

Claims (10)

In a wireless communication system, Obtain the number (FPCT) of the frequency partitions (FPCT), the size (FPS) of FPi with i> 0 and the number (FPSC) of subbands (SB) of FPi with i> 0 (where FPi Is the i th FP), Based on the FPCT, the FPS and the FPSC, the number of subbands K _{SB and FPi} of each FP and the number of minibands ( _{MB and FPi} ) are obtained. The subband PRU (PRU _SB ) including a plurality of contiguous PRUs based on the K _{SB , FPi} and the K _{MB , FPi ,} and the _miniband PRU (PRU _MB ) including a plurality of contiguous PRUs in units of PRU sets. Map to FP, And the PRU set includes the same number of PRUs as the number of the plurality of adjacent PRUs included in one subband. The method of claim 1, The K _{SB , FPi} and the K _{MB , FPi} are obtained by the following equation.

 However, FPSi is the number of PRUs included in FPi. The method of claim 1, Mapping the PRU _MB to each FP in units of PRU sets, Permuting the PRU _MB in units of PRU to map the PPRU _MB ; And mapping the PPRU _MB to each FP in units of the PRU set. The method of claim 3, wherein The mapping to each FP is performed by the following equation.

However, PRU _FPi (j) is the j-th PRU, PRU _SB (k ₁₎ in FPi is PRU _SB k ₁ th PRU, PPRU _MB (k ₂₎ represents a k ₂ th PRU of PPRU _MB. L _{SB , FPi} is the number of PRUs allocated to subbands of FPi, and L _{MB , FPi} is the number of PRUs allocated to _minibands of FPi. In addition, k ₁ and k ₂ are determined by the following equation.

The method of claim 1, The FPCT, the FPS and the FPSC are broadcast. The method of claim 1, The FPCT, the FPS and the FPSC is variable according to the bandwidth unit resource mapping method. In a wireless communication system, Some of the PRU _FPi , which is a logical resource included in the i th frequency partition (FPi), are mapped to the PRU _SB , _Map the remaining PRU _FPi to PRU _MB after mapping the PRU _SB , Mapping the PRU _SB or the PRU _MB to a PRU which is a physical radio resource in units of PRU sets, Including transmitting data via the PRU, The PRU _SB is assigned at least one subband including a plurality of contiguous PRUs, the PRU _MB is assigned at least one miniband including a plurality of contiguous PRUs, and the set of PRUs is one subband And a number of PRUs equal to the number of adjacent PRUs included in the plurality of PRUs. The method of claim 7, wherein Mapping the remaining PRU _FPi to PRU _MB , _Map the remaining PRU _FPi to PPRU _MB , Permuting and mapping the PPRU _MB to a PRU _MB . The method of claim 8, The mapping of PRU _FPi included in the FPi to PRU _SB or PRU _MB is mapped by the following equation. PRU _FPi (j) is the i-th FP of the j-th PRU, PRU _SB (k ₁₎ is the PRU _SB k ₁ th PRU, PPRU _MB (k ₂₎ represents a k ₂ th PRU of PPRU _MB. L _{SB , FPi} is the number of PRUs allocated to subbands of FPi, and L _{MB , FPi} is the number of PRUs allocated to minibands within FPi.

However, k ₁ and k ₂ are determined by the following equation.

In a wireless communication system, A processor; And Including an RF unit connected to the processor, The processor acquires the number of frequency partitions (FPCT), the size of FPi (iPS) of i> 0 (FPS) and the number of subbands (FPSC) of i> 0 (FPi) FP), Obtaining the number of subbands (K _{SB , FPi} ) and the number of _minibands (K _{MB , FPi} ) of each FP based on the FPCT, the FPS, and the FPSC, The subband PRU (PRU _SB ) including a plurality of contiguous PRUs based on the K _{SB , FPi} and the K _{MB , FPi ,} and the _miniband PRU (PRU _MB ) including a plurality of contiguous PRUs in units of PRU sets. Map to FP, The PRU set includes the same number of PRUs as the number of the plurality of adjacent PRUs included in one subband.

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