KR20100043790A - Apparatus and method for controlling in wireless communication system - Google Patents

Abstract

PURPOSE: An apparatus and a method for controlling in a wireless communication system are provided to improve transmission rate by controlling UL(Up Link) scheduling of an MS(Mobile Station) correspond to UL data information of a MS, sending power information, and UL channel condition. CONSTITUTION: An operator(210) determines transmission power density maximum byte according to each MCS(Modulation and Coding Scheme) level. The MCS levels are applicable in multi burst assigned to MS. A packet scheduler(220) assigns byte about multi burst in transmission power density and the maximum byte. A generator(230) generates MAP information including scheduling information.

Description

Apparatus and method for controlling in wireless communication system

The present invention relates to a wireless communication system, and more particularly, to a method and system for controlling uplink (UL) in a wireless communication system.

In the next generation wireless communication system, active researches are being conducted to provide users with services of various quality of service (QoS) having a high transmission speed (hereinafter referred to as 'QoS'). Particularly, in the next generation wireless communication system, methods for increasing data transmission capacity and improving QoS through limited resources have been proposed. In addition, orthogonal frequency division multiplexing (BWA) is used as a broadband wireless access (BWA) communication system to support a broadband transmission network on a physical channel of a wireless network system. IEEE (Institute of Electrical and IEEE) applying Orthogonal Frequency Division Multiplexing (OFDM) / Orthogonal Frequency Division Multiple Access (OFDMA) Electronics Engineers) 802.16 communication system has been proposed. The IEEE 802.16 communication system is a system that considers the mobility of the SS as well as the fixed subscriber station (SS) (hereinafter referred to as SS). Station, hereinafter referred to as 'MS').

Meanwhile, the wireless communication system performs scheduling for the MS in correspondence to the channel environment of the MS existing in the cell and the data packet corresponding to the MS. In other words, the scheduler of the base station (BS), which manages the MS, is referred to as a downlink (DL) according to the channel status and data packet of the MS. And a resource in the UL, and a modulation and coding scheme (MCS) and a transmission power level of the allocated resource are determined. In particular, the scheduler allocates resources in the UL for the MS corresponding to the information of the MS and determines the MCS level and the transmit power level. The information of the MS is data packet information, transmission power information, and the like of the MS.

Accordingly, there is a need for a specific UL scheduling control scheme for stably transmitting a large amount of data at high speed through limited frequency resources corresponding to information of the MS in a variable communication environment. In addition, there is a need for a control method of an MCS level and a transmission power level for improving the data transmission rate through resources allocated corresponding to data to be transmitted to the UL by the MS. In addition, when transmitting and receiving data by applying a hybrid automatic repeat request (HARQ) method, scheduling control for bursts and a control method of an MCS level and a transmission power level are required. .

Accordingly, an object of the present invention is to provide an apparatus and method for controlling scheduling of UL to improve transmission rate of UL data in correspondence with information of MS in a wireless communication system.

Another object of the present invention is to provide an apparatus and method for controlling UL scheduling, MCS level, and transmit power level of an MS in response to UL data information, transmit power information, and UL channel state of the MS in a wireless communication system. have.

An apparatus of the present invention for achieving the above objects, the apparatus comprising: an operator for determining the transmission power density and the maximum byte per MCS (Modulation and Coding Scheme) level applicable to multiple bursts assigned to the mobile station; A packet scheduler for allocating bytes for the multiple bursts at the transmit power density and the maximum byte per MCS level; And a generator for generating MAP information including scheduling information corresponding to the assignment.

The method of the present invention for achieving the above objects comprises the steps of checking the channel information and acknowledgment (ACK) / non-acknowledgement (NACK) message of the mobile station to determine the power offset, and confirms the transmission power report of the mobile station; Determining a capacity of the mobile station using the power offset and the transmit power report; Scheduling a packet at the determined capacity; And generating MAP information including the scheduling information of the packet scheduling.

The present invention can improve the transmission rate of UL data by controlling UL scheduling of the MS according to UL data information, transmission power information, and UL channel state of the MS when transmitting and receiving data with the MS using the HARQ scheme in a wireless communication system. In addition, the utilization efficiency of limited resources may be improved. In particular, the present invention provides limited resources by dynamically controlling the UL resource allocation, the MCS level, and the transmission power level for bursts for data transmission and reception in the HARQ scheme according to the UL data information, transmission power information, and UL channel state of the MS. The data transmission rate can be improved.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

The present invention relates to a control apparatus and method in an IEEE 802.16 communication system, which is a wireless communication system, for example, a broadband wireless access (BWA) communication system. Suggest. Here, in the embodiment of the present invention to be described later, orthogonal frequency division multiplexing (OFDM) orthogonal frequency division multiplexing (OFDM) in the IEEE 802.16 communication system for convenience of description. A wireless communication system to which an access (OFDMA: Orthogonal Frequency Division Multiple Access (OFDMA)) scheme is applied will be described as an example.

In addition, the present invention is a base station (BS: Base Station, referred to as "BS") that manages a predetermined cell in a wireless communication system and a mobile station existing in the predetermined cell and receiving a communication service from the BS ( MS: Provides an apparatus and method for scheduling control for data transmission and reception between a mobile station, hereinafter referred to as an "MS". In an embodiment of the present invention to be described later, UL scheduling for uplink (UL) data transmission is controlled. In addition, in an embodiment of the present invention to be described later, using the information corresponding to the MS to determine the modulation and coding scheme (MCS: Modulation and Coding Scheme (MCS)) and the transmission power level of the MS The MS allocates UL resources of the MS by performing scheduling at the determined MCS level and the transmit power level.

In addition, the present invention, when the BS and the MS transmits and receives data by applying a hybrid automatic repeat request (HARQ) method in a wireless communication system (HARQ) scheduling apparatus of the MS and Suggest a method. In an embodiment of the present invention to be described later, the MCS level and the transmission power level of the MS is determined according to the application of the HARQ scheme, and packet scheduling is performed at the determined MCS level and the transmission power level to allocate multiple bursts of the MS. . Here, the connection for data transmission between the BS and the MS may be classified into a connection supporting HARQ and a connection not supporting the HARQ, depending on whether the HARQ scheme is applied. In accordance with the application, data is transmitted and received via the above-described connections.

In addition, the multi-burst is a burst for transmitting a data packet through a connection not supporting the HARQ (hereinafter referred to as a normal burst) and a data packet through a connection capable of retransmission by supporting the HARQ. It includes a burst for transmitting the following (hereinafter referred to as 'HARQ burst (HARQ burst)'). The HARQ burst includes a first HARQ subburst and a second HARQ subburst, wherein the first HARQ subburst is a HARQ burst that is first transmitted over a connection that supports HARQ and the second HARQ subburst is the HARQ It means a HARQ burst that is retransmitted by failing to transmit a burst.

The present invention determines the capacity of the MS using information of the MS and channel information between the MS and the BS, and allocates multiple bursts by performing packet scheduling within the capacity of the MS. The above information will be referred to as headroom of the MS (e.g., transmit power available in consideration of the current transmit power level at the maximum transmit power of the MS (i.e., total transmit power)) and downlink (DL). Path loss and Carrier to Interference and Noise Ratio (CINR), CINR at UL, and noise and interference (NI) in a multi-cell environment. : Noise and Interference, hereinafter referred to as 'NI'). In this case, the BS receives channel quality information (CQI: hereinafter referred to as 'CQI') from the MS to obtain the DL CINR, and the BS measures the UL CINR and NI at UL to obtain the DL CINR.

In the embodiment of the present invention to be described later, the BS determines the transmission power level for every MCS level applicable to the MS using the headroom and DL CINR of the MS, path loss, UL CINR, NI, and the like, and the MCS level The capacity of the MS is determined by determining the maximum bytes that can be transmitted at each transmission power level. Then, packet scheduling is performed on the data packet of the MS at the transmission power level and the maximum byte for each MCS level to allocate a normal burst, a first HARQ sub burst, and a second HARQ sub burst. In addition, MAP information including scheduling information such as region information of the multiple burst, MCS level and transmission power level information is generated and transmitted to the MS. Next, the structure of the BS in the wireless communication system according to the embodiment of the present invention will be described in more detail with reference to FIG. 1.

1 is a diagram schematically illustrating a structure of a BS in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 1, the BS includes an interface 110 for processing the data when transmitting and receiving data with an upper end, a band signal processor 120 for modulating / demodulating and encoding / decoding data, and modulating and encoding data. Transmitter 130 for transmitting data to the receiver, a receiver 160 for receiving data from the MS, a scheduler 150 for performing data transmission and reception in the DL and UL, and an antenna for transmitting and receiving data to and from the MS on air. 140.

In the UL, the receiver 160 receives and converts one or more radio signals transmitted by MSs through the antenna 140 to a baseband signal. For example, the receiver 160 removes and amplifies the noise from the radio signals for data reception by the BS, down-converts the amplified signal to a baseband signal, and digitizes the down-converted baseband signal. The band signal processor 120 extracts information or data bits from the digitized signal to perform demodulation, decoding, and error correction processes. The information or data bits that perform this process are transmitted to the adjacent wired / wireless network via the interface 110 or transmitted to other MSs provided with services from the BS through a transmission path.

In the DL, the interface 110 receives voice, data, or control information from a control station or a wireless network, and the band signal processor 120 encodes the received voice, data, or control information, and then transmits the transmitter 130. Will output The transmitter 300 modulates the encoded voice, data, or control information into a carrier signal having a transmission frequency or frequencies to be transmitted, amplifies the modulated carrier signal to a level suitable for transmission, and transmits the air through the antenna 140. Send by

On the other hand, the scheduler 150 controls the operation and the respective components in the DL and UL. In particular, the scheduler 150 performs UL scheduling according to an embodiment of the present invention, wherein the MS capacity is determined using information of the MS and channel information in the DL and UL, and the MS data is determined based on the determined capacity. Packet scheduling is performed on the packets to allocate multiple bursts of the MS. Next, an apparatus for controlling scheduling of a UL in a wireless communication system according to an embodiment of the present invention will be described in more detail with reference to FIG. 2.

2 is a diagram schematically showing the structure of the scheduler 150 in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 2, the scheduler 150 may request a bandwidth request (BW-REQ) message, a transmit power report (Tx Power Report) message, and an ACK (BW-REQ) message from an MS. An operator 210 that receives an acknowledgment / NACK (NACK) message and channel information to determine the capacity of the MS, and performs packet scheduling on UL data of the MS at the capacity determined by the operator 210. A packet scheduler 220 for assigning multiple bursts to the generator, and a generator 230 for generating MAP information by using the scheduling information of the packet scheduler 220.

The operator 210 receives the DL CINR, the UL CINR, and the NI. The DL CINR is obtained through the CQI received from the MS, and the UL CINR and the NI may be obtained by measuring the BS in the UL. Here, the channel information includes DL / UL CINR, path loss, NI, and the like. The operator 210 confirms the MCS level and the transmission power level determination and the resource allocation request in the UL through the BW-REQ message received from the MS, and transmits the MS in the UL through the transmission power report message. The power level is checked and whether the data packet is normally received according to data transmission / reception using the HARQ scheme between the BS and the MS through the ACK / NACK message.

Here, the operator 210 checks the channel state of the MS through DL / UL CINR, path loss, and NI, and checks the headroom of the MS through the transmit power level. In addition, the channel state of the MS refers to the channel state of the DL and UL according to the noise and interference caused by the neighboring cells in the multi-cell environment as well as the noise and interference caused by the elements in the cell. The channel state of the UL is determined by CINR, path loss, NI, and the like.

The operator 210 determines the capacity of the MS for packet scheduling of the packet scheduler 220 according to the headroom and the channel state of the MS. Here, the operator 210 determines the transmit power level and the maximum byte for each MCS level applicable to the multiple bursts allocated to the MS with the capacity of the MS. The operator 210 causes the packet scheduler 220 to perform packet scheduling for the data packet of the MS at the transmission power level and the maximum byte for each MCS level.

Here, the packet scheduler 220 may allocate multiple bursts to the MS such as a normal burst, a first HARQ subburst, and a second HARQ subburst, and the MCS level applicable to the multiple bursts is QPSK (QPSK: Quadrature Phase). Shift Key, hereinafter referred to as 'QPSK') 1/2 × 6 (QPSK1 / 2 repetition 6), QPSK1 / 2 × 4 (QPSK1 / 2 repetition 4), QPSK1 / 2 × 2 (QPSK1 / 2 Repeat 2), QPSK1 / 2, QPSK3 / 4, and 16QAM (QAM: Quadrature Amplitude Modulation, hereinafter referred to as 'QAM') may be 1/2, 16QAM3 / 4, or the like. The operator 210 determines the transmit power level and the maximum byte for each MCS level applicable to the multiple bursts allocated to the MS and provides the packet scheduler 220 with the maximum byte.

The packet scheduler 220 receives the transmission power level and the maximum byte for each MCS level determined by the operator 210, and transmits UL packet data to be transmitted by the MS according to the BW-REQ message of the operator 210. In addition, packet scheduling is performed on the packet data of the MS at the transmission power level and the maximum byte for each MCS level, and the multi-burst is allocated to the MS. Here, the packet scheduler 220 receives a power control information element (Power Control IE) corresponding to the transmission power level determined by the operator 210, and the packet scheduler 220 receives the MCS level. A burst is allocated by performing packet scheduling corresponding to the power control information element at each transmit power level and a maximum byte.

In addition, the packet scheduler 220 may allocate the normal burst, the first and the second HARQ subbursts as described above, and in particular, the packet scheduler 220 may be configured within the maximum byte determined by the operator 210. Determine bytes for a burst to send the packet data. In addition, the packet scheduler 220 transmits the scheduling information including the burst information and the MCS level and the transmission power level of the burst to the generator 230, the burst information, the normal burst, the first and Indication information indicating that the second HARQ sub-burst, and the normal burst in the frame, the position information and size information of the first and second HARQ sub-burst in the frame.

The generator 230 receives scheduling information from the packet scheduler 220 to generate MAP information, and transmits the generated MAP information to the MS. Next, the operator 210 and the packet scheduler 220 of the scheduler 150 in the wireless communication system according to the exemplary embodiment of the present invention will be described in more detail with reference to FIG. 3.

3 is a diagram schematically illustrating the structures of the calculator 210 and the packet scheduler 220 of the scheduler 150 in the wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the calculator 210 checks whether the data packet is normally received and calculates an ACK / NACK ratio. The HARQ checker 302 calculates the CINR in the DL / UL based on a reference MCS. CINR normalization unit 304 normalizing to a level, and CINR adjustment unit adjusting the normalized CINR (NCINR) by the ACK / NACK ratio calculated by the HARQ check unit 302 in accordance with whether or not the data packet is normally received 306, an offset determination unit 308 for determining an offset using the adjusted normalized CINR, an offset storage unit 310 for storing the offset in an offset table, the received BW-REQ message and a transmission power report message The message checking unit 314 for confirming the transmission power, the transmission power checking unit 316 for confirming the transmission power report of the MS through the transmission power report message, and the MS capacity using the transmission power report and the offset of the MS. Applies to multiple bursts assigned to A capacity determiner 312 determines a possible transmit power level and a maximum byte for each MCS level. Here, the capacity determiner 312 determines the transmission power level and the maximum byte for each MCS level applicable to the MS by using the offset determined by the ACK / NACK ratio and the normalized CINR, so that the calculator 210 determines the BS and the BS. More accurate MCS level and transmission power level are determined by considering channel status between MSs as well as whether packet data is normally received.

The packet scheduler 220 may include a resource storage unit 352 for storing a resource table including a maximum byte for each MCS level determined by the operator 210, a data queue 354 for arranging data packet information of the MS, A scheduling unit 356 for performing packet scheduling at the transmission power level for each MCS level determined by the operator 210 and the maximum byte using the resource table, and the parameters of the MS corresponding to the MAP information generated by the generator 230 are determined. And a parameter information storage unit 362 for storing the MS information corresponding to the parameters of the MS, the MCS level, and the transmission power level. Here, the packet scheduling unit 356 performs packet scheduling, allocates multiple bursts to the MS, and transmits scheduling information corresponding to the multiple burst assignments to the generator 230.

As described above, the HARQ checking unit 302 confirms reception of an ACK / NACK message from the MS as to whether or not the data packet is normally received as data is transmitted and received between the BS and the MS by applying the HARQ scheme. The ACK / NACK ratio corresponding to the reception of the ACK / NACK message is calculated and transmitted to the CINR adjustment unit 306.

The CINR normalization unit 304 receives the CINR measured by the BS in the UL for a predetermined burst transmitted by the MS through the UL, and normalizes the received CINR to a reference MCS level, for example, QPSK1 / 2, to adjust the CINR adjustment unit 306. Send normalized CINR (NCINR) In addition, the CINR measured by the BS in UL includes a frame number, a basic connection identifier (BCID) of the MS (hereinafter, referred to as a 'BCID'), and an HARQ channel identifier (ACID). And managed by the BS).

More specifically, the CINR normalization unit 304, the measured CINR of each burst, the scheduling MCS level information stored in the parameter storage unit 362, the CINR average parameter, the normalization table, and the relative power for the UL HARQ burst. The offset is input and an average normalized CINR is output using the input information. The CINR normalization unit 304 calculates a normalized CINR for each burst, calculates an average of the calculated normalized CINRs, and refers to a UL channel descriptor (UCD). During setup, check the normalized CINR table and the UL HARQ burst relative power offset.

Here, the normalized CINR of the CINR normalization unit 304 means a CINR normalized based on a required CINR corresponding to the reference MCS level, and the normalized CINR may be expressed as Equation 1 below. In Equation 1, NCINR _{norm_㏈} [k] means the normalized CINR of the scale for the kth burst based on the normal burst, and the measured normalized CINR and the normalized CINR of the scale are expressed in Equation 2 below. are as shown in equation 2 NCINR _㏈ [k] denotes the normalized CINR of ㏈ scale for the k th burst, and NCINR [k] indicates the normalized CINR measured for the k th burst. In Equation 1, CINR _㏈ [k] means measured CINR of the k scale for the k-th burst, HARQ_Offs means relative power offset for UL HARQ burst, and C / N [ k] means the required CINR for the predetermined MCS level of the kth burst. Here, C / N [k] means a carrier / noise normalized corresponding to the predetermined MCS level with a required CINR corresponding to the measured CINR for a kth burst, and C / N _{QPSK1 / 2} is the required CINR for QPSK1 / 2, meaning C / N normalized corresponding to a reference MCS level, e.g. QPSK1 / 2, like the normalized CINR, where R [k] is an iteration of the MCS level for the kth burst R ₁ means a number of repetitions of the reference MCS level, that is, QPSK 1/2. Here, C / N is determined by the normalization table.

은 ㏈ 스케일의 평균 정규화 CINR을 의미하며, 수학식 5에서

은 측정된 평균 정규화 CINR을 의미하고, n은 CINR이 측정된 연속적인 프레임의 개수를 의미한다.Then, the normalized CINR of the Z-scale shown in Equation 1 is converted into the normalized CINR of the linear scale by Equation 3 below, and thus the averaged normalized CINR is expressed as Equation 4 and Equation 5 below. Can be represented. Here, in equation (4)

Is the mean normalized CINR of the scale, and

Denotes the measured average normalized CINR, and n denotes the number of consecutive frames in which the CINR is measured.

For example, the received CINR for three multiple bursts is 10 Hz (QPSK1 / 2). If 15 ㏈ (16QAM1 / 2), 20 ㏈ (QPSK1 / 2), and the required CINR for each MCS level is 14 ㏈ (QPSK1 / 2), 18 ㏈ (16QAM1 / 2), then the normalized CINR of all bursts is 10 kHz, 11 kHz, and 20 kHz, and the normalized CINR on the linear scale is 10, 12.6, 100. Therefore, the mean value of all NCINRs is 40.9, and the scale of all NCINR mean values is 16.11 ms, so the average 16.11 ms is used as the representative CINR of multiple bursts. The average normalized CINR calculated in this way removes components of a transmission power level that varies according to the MCS level of the MS and a transmission power level that varies according to the HARQ from the UL CINR, so that only the CINR that varies according to the channel state of the UL can be identified. have.

The CINR adjustment unit 306 determines the adjustment CINR offset using the ACK / NACK ratio received from the HARQ check unit 302, and determines the adjustment CINR offset and the normalized CINR received from the CINR normalization unit 304. The sum is adjusted to normalize the CINR, and the adjusted normalized CINR is output to the offset determiner 308. Here, the CINR adjusting unit 306 checks the ACK / NACK ratio determined through the ACK / NACK message, and increases the number of ACK / NACK frames according to the checked ACK / NACK ratio. In addition, the CINR adjustment unit 306 enables CINR adjustment for each BCID, resets the ACK / NACK ratio and adjustment CINR offset, total number of ACK / NACK frames, maximum data packets, threshold frame number, and the ACK / The increase / decrease value corresponding to the number of NACK frames is managed.

If the total number of the increased ACK / NACK frames is greater than the maximum data packet, the CINR adjustment unit 306 updates the adjusted CINR offset corresponding to the number of the ACK / NACK frames, and updates the updated adjusted CINR offset. Adjust the normalized CINR by summing up the normalized CINR with. The adjustment CINR offset is updated with the adjustment CINR offset in the current frame after adding up the increase / decrease value corresponding to the number of ACK / NACK frames with the adjustment CINR offset in the previous frame, and normalizing the updated adjustment CINR offset. The normalized CINR is adjusted by the sum of the CINRs. The adjusted normalized CINR may be represented by Equation 6 below, where Adj (n) denotes an adjusted CINR offset of n frames.

는 노멀 버스트에 대한 노멀 버스트를 기준으로 k번째 버스트에 대해 ㏈ 스케일의 평균 CINR을 의미하며, C/N_QPSK1/2은 QPSK1/2의 기준 MCS 레벨에 대한 요구 CINR로서 QPSK1/2에 상응하여 정규화된 C/N을 의미한다.The offset determination unit 308 determines the offset through the difference between the normalized CINR received from the CINR adjustment unit 306 and the C / N normalized to the required CINR for the reference MCS level, the offset of the scale It can be expressed as Equation 7. Here, the offset determiner 308 receives an average normalized CINR and a normalized table of the adjusted normalized CINR, determines an offset, and determines an offset for all BCIDs, and determines an offset table including the determined offset. Output to the offset storage unit 310. And, in equation (7)

Is the mean CINR of the scale for the kth burst based on the normal burst to normal burst, and C / N _{QPSK1 / 2} is the required CINR for the reference MCS level of QPSK1 / 2 and normalized corresponding to QPSK1 / 2. Means C / N.

The offset storage unit 310 stores and manages an offset table including the BCID and the offset of the MS. Here, the offset table is updated and stored by the offset determined by the offset determiner 308.

The message acknowledgment unit 314 confirms headers of the BW-REQ message and the transmission power report message, and in particular, transmits the HARQ burst whether the transmission power report is a normal power burst through the ACID included in the header of the transmission power report message. Check if the power information. In addition, the message confirming unit 314 may identify the NI by using the transmission power report. For example, the message checking unit 314 may transmit the power level for the first HARQ subburst and the (n + m) th frame in any nth frame. The NI may be identified through a difference between transmit power levels for the second HARQ subburst, which is the retransmission HARQ burst of the first HARQ subburst.

The transmission power confirmation unit 316 confirms the transmission power report of the MS through the header confirmation of the transmission power report message, and confirms the transmission power and the headroom of the MS using the transmission power report, in particular, Determine the available transmit power by considering the transmit power level at the maximum transmit power, ie the total transmit power. Here, the transmission power checking unit 316 may check the MCS level for the burst through the transmission power level, and in particular, the MCS level may be more easily identified using the parameters stored in the parameter storage unit 362.

The capacity determiner 312 uses the headroom of the MS received from the transmit power checker 316 and the offset received from the offset storage 310 to determine the capacity of the MS, that is, multiple bursts allocated to the MS. Determine the transmit power level and the maximum byte per applicable MCS level. Here, the capacity determining unit 312 determines the normalized transmission power level and the total available transmission power of the MS using the headroom and the offset of the MS, and transmits all MSC levels applicable to the total transmission power. The transmission power density is determined by the power level, and after determining the maximum byte for all the MCS levels, the transmission power level and the maximum transmission power level for each MCS level are performed so that packet scheduling is performed at the transmission power level and the maximum byte for each MCS level. Information about the bytes is provided to the packet scheduler 220.

The resource storage unit 352 stores and manages a resource table including a maximum byte for each MCS level according to a normal burst and a HARQ burst. Here, the resource table is stored by updating the maximum byte for each MCS level for the normal burst determined by the capacity determiner 312 and the maximum byte for each MCS level for the HARQ burst.

The data queue 354 manages data queue information of data packets corresponding to multiple bursts of the MS, and receives power control information elements of multiple bursts from the capacity determiner 312. The data queue 354 arranges data queue information corresponding to multiple bursts of the MS using a power control element and transmits the data queue information to the scheduling unit 356.

The scheduling unit 356 selects one MCS level among all MCS levels applicable in the resource table received from the resource storage unit 352, and performs packet scheduling within a maximum byte corresponding to the selected MCS level. Allocates bytes corresponding to multiple bursts allocated to the MS. Here, the scheduling unit 356 allocates bytes corresponding to multiple bursts so as not to exceed the maximum data capacity of the selected MCS level. The scheduling unit 356 transmits scheduling information about the MS to the generator 230, and transmits the scheduling information to the resource storage unit 352 to update the resource table.

The parameter storage unit 362 stores and manages scheduling information corresponding to the packet scheduling of the packet scheduler 220, and in particular, receives the MAP information generated by the generator 230 in response to the packet scheduling, Store and manage parameters. Herein, the parameters include frame number, ACID, NI, MCS level, required CINR, normalized CINR, normalized CINR, number of frames measured corresponding to multiple bursts allocated to the MS corresponding to the scheduling, offset, cumulative offset, and 0. Non-number of frames, normalized transmit power, transmit power report, MCS level of transmit power report, frame number of transmit power report, maximum data capacity allocated, and total transmit power. In addition, the parameter storage unit 362 stores and manages the transmission power level for the multiple bursts by normalizing the reference MCS level, for example, QPSK1 / 2. The parameters stored in the parameter storage unit 362 are transmitted to the CINR normalization unit 304 and the MS information storage unit 360.

The MS information storage unit 360 stores and manages not only the MS parameters stored in the parameter storage unit 362 but also the MCS level information having the BCID and the maximum byte, where the number of non-zero frames is not stored. It may not. In addition, scheduling may be performed using a proportional fair (PF) scheduling method using information of the MS stored in the MS information storage unit 360. Next, the operation of the scheduler 150 in the wireless communication system according to the embodiment of the present invention to control the UL scheduling will be described with reference to FIG. 4.

4 is a diagram schematically illustrating an operation in which the scheduler 150 controls UL scheduling in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 4, in step S402, a BW-RWQ message, an ACK / NACK message, a transmission power report message, and channel information are received. The MS checks the data packet of the MS through the received BWQ-REQ message, confirms the presence of a HARQ burst through the ACK / NACK message, and confirms the transmission power report of the MS through the transmission power report message. The channel state of the MS is checked through the channel information.

Then, through the confirmation as described above in step S404 to determine the transmit power level and the maximum byte per MCS level applicable to multiple bursts allocated to the MS in the capacity of the MS. Here, the offset is determined by using the identified HARQ burst and the channel state, and after normalizing the transmission power level through the transmission power report, the total transmission power of the MS is determined, and the total transmission power is determined by the MS. Determine the maximum transmit byte and transmit power level per MCS level applicable for the multiple bursts to be allocated.

In operation S406, packet scheduling is performed at an MCS level transmission power level and a maximum byte applicable to the multiple bursts allocated to the MS, and the MS is allocated a multiple burst. Here, multiple bursts including normal bursts, first and second HARQ subbursts, and the like may be allocated according to the ACK / NACK message of the MS. Next, in step S408, MAP information corresponding to the packet scheduling is generated and transmitted to the MS. Here, the MAP information includes scheduling information including burst information of an MS and information on an MCS level and a transmission power level of the multiple burst. Next, the process of determining the capacity of the calculator 210 in the wireless communication system according to the exemplary embodiment of the present invention will be described in more detail with reference to FIG. 5.

5 is a diagram schematically illustrating an operation process of the calculator 210 in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, in step S502, the CINR determined according to the channel state is normalized to a reference MCS level, for example, QPSK1 / 2, and the normalized CINR is adjusted using the ACK / NACK ratio determined according to the reception of the ACK / NACK message. do. Then, in step S504, the offset is determined through the difference between the adjusted normalized CINR and the C / N normalized to the required CINR for the reference MCS level, and the transmission power report of the MS is transmitted through the transmission power report message received from the MS. Check it.

In operation S506, the transmission power level for every MCS level applicable to the multiple bursts allocated to the MS is determined by using the offset and the transmission power report of the MS, and the transmission power density, for example, the maximum byte for each MCS level is determined. do. Here, the normalized transmission power level is updated using the transmission power report of the MS and the determined transmission power level, and all applicable MCS levels are identified using the maximum MCS level considering the CINR, and the updated normalized transmission power level and The offset is used to determine the transmit power density and maximum bytes for every MCS level applicable. Then, the packet scheduler 220 performs packet scheduling at the determined transmit power density and maximum byte for each MCS level. Next, the capacity determination in the wireless communication system according to the embodiment of the present invention will be described in more detail with reference to FIG. 6.

6 is a diagram schematically illustrating an operation process of the capacity determiner 312 in the wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 6, in operation S602, an offset is checked through an offset table received from the offset storage unit 310, and the offset is filtered according to a preset maximum offset and minimum offset. Then, in step S604, the transmission power level of the MS through the filtered offset and the transmission power report and headroom of the MS received from the transmission power checking unit 316, that is, by the transmission power level and scheduling reported from the MS, Check the last determined transmit power level.

In operation S606, the normalized transmission power level is updated using the most recent transmission power level among the transmission power level reported from the MS and the last transmission power level determined, and the filtered offset. In operation S608, the normalized transmission power level is updated. The transmit power level is used to determine the transmit power density as the transmit power level for every MCS level applicable to multiple bursts of the MS. Here, the update of the normalized transmit power level is updated by adding the offset to the normalized transmit power corresponding to the most recent transmit power level.

Next, the total transmission power of the MS is determined using the transmission power density for every MCS level determined in S610, the maximum byte for every MCS level is determined from the total transmission power, and the packet at the maximum byte for each MCS level is determined. Information about the maximum byte for each MCS level is transmitted to the packet scheduler 220 to perform scheduling. Next, the offset filtering in the wireless communication system according to the embodiment of the present invention will be described in more detail with reference to FIG. 7.

FIG. 7 schematically illustrates an offset filtering process of the capacity determiner 312 in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 7, in operation S702, the current frame number and the offset are determined to be non-zero, and the offset table stored in the offset storage unit 308 in operation S704 is greater than the frame threshold. Check the offset using. Then, the filter is performed according to the maximum power offset and the minimum power offset preset in step S706, and the filtering is performed based on the maximum power offset and the minimum power offset corresponding to the maximum threshold power offset and the minimum threshold power offset in the offset table. do. Here, the maximum threshold power offset and the minimum threshold power offset are preset as thresholds for the maximum power offset and the minimum power offset.

Next, if the filtered offset is not 0 in step S708, a power control IE is generated and transmitted to the packet scheduler 220, and in step S710, the offset of the offset table is reset to zero. The offset table is updated and maintained by the offset determined by the offset determination unit 308. If the difference between the checked frames in step S702 is equal to or less than a frame threshold or in step S708, the filtered offset is 0. Reset the offset to zero.

Here, the capacity determiner 312 receives the offset table, the maximum power offset, the minimum power offset, the maximum threshold power offset, the minimum power threshold offset, and the parameters of the parameter storage unit 362 and the offset as described above. Perform filtering to output the reset offset table. In addition, in order to perform the above-described offset filtering operation, the capacity determiner 312 checks a periodic condition for the power control IE in each frame for each MS, and checks a maximum power offset, a minimum power offset, and a maximum threshold power in an offset table. Compare the offset, and the minimum power threshold offset, generate a filtered offset table for the currently scheduled frame, send a power control IE, and reset the offset table. Next, the transmission power level check and the normalized transmission power level update in the wireless communication system according to the embodiment of the present invention will be described in detail with reference to FIG. 8.

8 is a diagram schematically illustrating a transmission power level checking and normalized transmission power level updating process of the capacity determiner 312 in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 8, the normalized transmission power level determined last in step S802 and the transmission power level reported through the transmission power report message are checked. Here, the determined normalized transmission power level is stored in the parameter storage unit 362 by checking the MAP information of the parameter storage unit 362, and the reported transmission power level is reported in the transmission power of the transmission power confirmation unit 316. The transmission power confirmation unit 316 is stored by the confirmation.

Next, in step S804, the current frame, the frame in which the transmission power report message is received, and the frame in which the CINR is measured are checked. In operation S806, the normalized transmission power level is determined using the last normalized transmission power level and the reported transmission power level corresponding to the frame check result. Here, the normalized transmit power level is the most recent normalized transmit power level of the last determined normalized transmit power level and the reported normalized transmit power level of the reported transmit power level.

Next, in step SS808, the offset is added to the most recent normalized transmit power level to update the normalized transmit power level. At this time, when the difference between the current frame number and the frame number in which the transmission power report message is received is greater than a threshold period, the transmission power report is not determined, and the normalized transmission power level is determined as shown in Equation 8 below.

The normalized transmit power level determined by Equation 8 is a normalized transmit power level when the channel condition is poor and a transmission power report message is not received from the MS, and in particular, the BS may transmit the channel information of the MS, for example, a received signal strength indicator ( RSSI: Receive Signal Strength Indicator (hereinafter referred to as 'RSSI') refers to the normalized transmit power level determined by the MS considering that it is located at the edge of the cell. In Equation 8, NTP _W denotes a normalized transmit power level when the MS is located at the edge of the cell, and BS _EIRP is included in a DL Channel Descriptor (DCD). RS stands for Effective Isotropic Radiated Power (EIRP), RS _edge means preset RSSI when MS is located at the edge of cell, and AcBSoff _SS is MS It means the cumulative BS offset.

When the normalized transmission power level is determined as shown in Equation 8, the normalized transmission power level is updated using the relative power offset for the UL HARQ burst after checking whether there is a HARQ burst in operation S808.

In operation S806, the difference between the current frame number and the frame number at which the transmission power report message is received is equal to or less than a threshold period, and the difference between the frame number at which the transmission power report message is received and the frame threshold is CINR. If the same as the measured frame number, in step S808 to determine the MCS level of the reported transmission power level. In this case, the MCS level is determined in accordance with the ACID and BCID, the C / N normalized corresponding to the reported transmission power level, the reference MCS level (ie, the required CINR according to the reference MCS level), the determined MCS level Perform an operation (sum) using a corresponding normalized C / N (i.e., the required CINR according to the determined MCS level), and the number of iterations corresponding to the reference MCS level and the number of iterations corresponding to the determined MCS level To update the normalized transmit power level.

Then, after confirming the existence of the HARQ burst in step S808, and confirms the first scheduled frame number of the HARQ sub-burst, using the difference between the cumulative offset of the frame measuring the CINR and the cumulative offset of the first scheduled frame To update the normalized transmit power level again. And update the updated normalized transmit power level by using a relative power offset for the UL HARQ burst, for example, adding the relative power offset to the normalized transmit power level and adding the NI and the transmit power of the current frame. The re-updated normalized transmit power level is updated by performing an operation (sum) using the NI of the difference between the frame number from which the report message was received and the frame threshold.

In addition, as a result of the checking in step S806, the difference between the current frame number and the frame number where the transmission power report message is received is equal to or less than a threshold period, and the difference between the frame number where the transmission power report message is received and the frame threshold value is different. If the CINR is greater than the measured frame number, the C / N normalized corresponding to the transmission power level reported in step S808, the reference MCS level, the C / N normalized corresponding to the MCS level of the BW-REQ message header, And using the difference between the number of repetitions corresponding to the reference MCS level and the number of repetitions corresponding to the MCS level of the BW-REQ message header. Then, in step S808, the normalized transmit power level is updated by using the NI of the current frame and the difference between the frame number at which the transmit power report message is received and the frame threshold.

In addition, in step S806, the difference between the current frame number and the frame number at which the transmission power report message is received is equal to or less than a threshold period, and the difference between the frame number at which the transmission power report message is received and the frame threshold value measures CINR. If smaller than the frame number, the normalized transmit power level is updated again using the difference between the transmit power level reported in step S808 and the NI of the current frame and the NI of the most recent frame.

Here, the capacity determiner 312 receives the last stored transmission power report message header, the last determined transmission power level, the normalization table, the relative power offset for the UL HARQ burst, and the filtered offset table. Determine the normalized transmit power level. In order to perform the above-described transmission power checking operation, the capacity determining unit 312 checks the transmission power level determined last in the parameters stored in the parameter storage unit 362, and checks the MCS level of the transmission power report message header. A bell is used to confirm the normalized transmit power level in the transmit power report message header and to determine the relative power offset for the UL HARQ burst in the transmit power report with HARQ burst.

When the final normalized transmit power level is determined by updating the normalized transmit power level in this manner, the capacity determiner 312 uses the normalization table for every MCS level applicable to multiple bursts of the MS according to the final normalized transmit power level. Determine the transmit power density. Here, the final normalized transmission power level is a transmission power level updated by normalizing the most recent transmission power level among the reported transmission power level and the determined transmission power level as described above.

In addition, the transmission power density for each MCS level may be expressed as in Equation 9 below, and the capacity determiner 312 receives all final MCS levels, a normalization table, and a relative offset for HARQ. Determine the transmit power density for the level. That is, the capacity determiner 312 may update the final normalized transmit power level updated, the required CINR for each MCS level applicable to the multiple bursts, the required CINR for a reference MCS level, and the MCS level applicable to the multiple bursts. Using the number of times, the transmission power density for each MCS level is determined as shown in Equation (9). In Equation 9, TP _MCS means transmit power density for a predetermined MCS level, NTP _final means the final normalized transmit power level, and C / N _MCS corresponds to a predetermined MCS level with a required CINR of a predetermined MCS level. It means normalized C / N, and R _MCS means the number of repetitions corresponding to a predetermined MCS level.

When the transmission power density for every MCS level applicable to the multiple bursts assigned to the MS is determined, the capacity determining unit 312 checks the total transmission power of the MS by using the transmission power density, and the total transmission. Determine the maximum bytes for all applicable MCS levels in power. Next, the transmission power density and the maximum byte determination in the wireless communication system according to the embodiment of the present invention will be described in more detail with reference to FIG. 9.

9 is a diagram schematically illustrating a transmission power density and a maximum byte determination process of the capacity determiner 312 in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 9, in step S902, the resource table stored in the resource storage unit 352 is received to reset the resource table. Then, in step S904, the maximum MCS level considering the DL CINR of the MS is checked at all MCS levels applicable to the multiple bursts allocated to the MS using the resource table, and the maximum MCS level is determined as the predetermined MCS level.

In operation S906, the transmission power density for the predetermined MCS level is determined as shown in Equation 9, and after confirming the presence of the HARQ burst, the determined MCS level is determined using the relative power offset for the UL HARQ burst. Update star transmit power density. Here, if the HARQ burst does not exist, the update of the transmit power density is not performed, and the update adds the relative power offset to the determined transmit power density for each MCS level. Next, the MS determines the maximum byte for the predetermined MCS level in the total transmit power available by the MS using a lookup table preset in step S908, and uses the maximum byte for the predetermined MCS level to determine the resource table. The total transmit power of the MS is updated by updating the resource table. Here, the total transmit power update of the MS means an update of the total transmit power available to the MS. That is, the total transmit power available to the MS is updated by the transmit power density and the maximum byte for each MCS level.

Then, in step S906, the transmission power density for the MCS level following the predetermined MCS level is determined at all MCS levels applicable to the multiple bursts allocated to the MS, and in step S908, the total transmission power of the updated MS is determined. Determine the maximum byte for the next MCS level. In other words, the capacity determiner 312 checks the maximum MCS level at all MCS levels applicable to the multiple bursts assigned to the MS, determines the transmission power density for each MCS level from the maximum MCS level to the minimum MCS level, The total transmit power available for each MCS level is determined using the transmit power density, and a maximum byte for every MCS level applicable in the total transmit power is determined.

Herein, the capacity determining unit 312 may include transmission power densities for all applicable MCS levels, burst area size information, permutation information, total transmission power of the MS, maximum MCS level, minimum MCS level, and DL. The CINR is input and the maximum byte for all applicable MCS levels is determined to output the resource table. The capacity determiner 312 calculates the total transmit power available in multiple bursts from the transmit power density for each MCS level of the MS in order to perform the maximum byte determination operation for all the applicable MCS levels described above. Calculate the total number of subcarriers available in the calculated total transmission power, calculate the total number of usable subchannels corresponding to the total subcarriers, and calculate subcarriers for each subchannel considering data, pilot, and substitution. do.

In addition, the capacity determiner 312 calculates the total number of available slots corresponding to the total number of available subchannels, and the number of slots for each subchannel that can be obtained from the area size information for each burst region. The maximum byte is calculated according to the total number of available slots. In addition, when the MCS level application is restricted, the capacity determiner 312 may set the maximum byte for the restricted MCS level to 0, and indicate the MCS level application by using the parameters of the maximum MCS level and the minimum MCS level. Next, the process of packet scheduling by the packet scheduler 220 in the wireless communication system according to the embodiment of the present invention will be described in more detail with reference to FIG. 10.

10 is a diagram schematically illustrating an operation process of the packet scheduler 220 in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 10, in operation S1002, the maximum byte for each MCS level determined by the capacity determiner 312 of the calculator 210 is checked. Here, the capacity determiner 312 determines the transmission power density and the maximum byte for all MCS levels applicable to the multiple bursts assigned to the MS as described above, and outputs the transmission power density and the maximum byte to the resource table, the packet scheduler 220 Receives the resource table and checks the maximum bytes for each MCS applicable to multiple bursts.

Then, in step S1004, one MCS level of all applicable MCS levels is selected according to the preset scheduling policy, and in step S1006, the bytes for each multi-burst of the MS are allocated so as not to exceed the maximum byte of the selected MCS level. . Here, the scheduling policy may be a maximum MCS level selection in all applicable MCS levels, an MCS level selection having the largest maximum byte, or an MCS level selection that is the same as a previously scheduled MCS level. In addition, the scheduling information corresponding to the byte allocation is transmitted to the generator 230 so that the generator 230 generates MAP information, and is stored in the parameter storage 362, and in particular, the parameter storage 362 Stores information about the allocated bytes and the selected MCS level per MS normal burst, first HARQ sub burst, and second HARQ sub burst. In addition, the packet scheduler 220 selects packets for each connection according to the quality of service (QoS) parameter of the connection and the characteristics of the physical layer for the MS, and the generator The 230 generates MAP information in consideration of the selected packets and scheduling information.

In operation S1008, the controller determines a maximum MCS level and a minimum MCS level corresponding to the byte allocation, and checks the total transmission power used according to the maximum MCS level and the minimum MCS level using the lookup table, and uses the total transmission. The total transmit power of the resource table is updated with the total transmit power left to be available by the power, and the resource table 352 stores and manages the resource table in which the total transmit power is updated. Hereinafter, an initial procedure for scheduling a basic capability negotiation request (SBC-REQ: Mobile Station's Basic Capability Negotiation Request (SBC-REQ)) message in a wireless communication system according to an embodiment of the present invention will be described. Let's explain.

The capacity determiner 312 selects an appropriate MCS level and determines a byte according to a scheduling policy in a resource table to receive an SBC-REQ message from an MS in an initial procedure, and includes a resource including an initial transmit power level and a maximum byte. Update the table. Here, the initial transmit power level and the maximum byte is determined by considering that the MS is located in the edge region of the cell as the initial transmit power level and the maximum byte for the SBC-REQ, and the initial transmit power level is In Equation 10, TP _Init denotes an initial transmit power level, and G _An denotes a transmit antenna gain of a BS.

는 x 이하의 값을 갖는 가장 큰 정수의 반복 함수를 의미한다.In addition, the capacity determiner 312 calculates the total number of usable subchannels using the initial transmission power level determined by Equation 11, and the total number of usable subchannels is represented by Equation 11 below. Can be. In Equation 11, N _sub denotes the total number of available subchannels, and M _sub denotes the number of subchannels of an UL subframe, for example, a 1024 Fast Fourier Transform (FFT). 35). In Equation 11, TP _tot means the maximum usable transmit power level identified by the SBC-REQ message, and ScPSub is the number of subcarriers per subchannel, for example, 24 in PUSC.

Means the repeat function of the largest integer with a value less than or equal to x.

The capacity determining unit 312 calculates a maximum byte for a predetermined MCS level by using the total number of usable subchannels calculated by Equation 12, that is, the total number of usable subchannels is determined by the total number of usable subchannels. The maximum byte is determined, and the maximum byte can be represented by Equation 12 below. In Equation 12, MB _MCS denotes a maximum byte for a predetermined MCS level, SIPSub denotes the number of slots of one subchannel, and Byte per slot _MCS denotes a byte per slot for the predetermined MCS level. .

In addition, the capacity determining unit 312 checks the request byte for the SBC-REQ message when the initial transmission power level is the default value, and transmits the request byte at a reference MCS level, for example, QPSK1 / 2. Calculate a maximum normalized initial transmit power level, and receive the SBC-REQ message to calculate a normalized transmit power level. In this case, the normalized transmission power level may be represented as in Equation 13, where NTP is a normalized transmission power level, and TP _cur is the current transmission power TLV (Type Length Value) of the SBC-REQ message. It means the value.

The capacity determiner 312 filters an offset calculated according to a power control mode, for example, a closed loop power control mode or an open loop power control mode. The offset in the closed loop power control mode is confirmed by the BS by measuring the CINR corresponding to the MCS level, and the offset in the open loop power control mode is calculated by the MS as shown in Equation 14 below. In Equation 14, Offset_SSper _SS denotes an offset calculated by the MS, P _{Tx, CL_Lasts} denotes a transmit power level used by the MS for the last transmission in the closed loop power control mode, and L _{OL_init} denotes a closed loop power control mode. The path loss estimated by the MS during the _transition from open loop power control mode to _{OL_init} is the last NI level transmitted in the UL noise and interference level IE before the change to open loop power control mode, and C / N _{CL_last} means normalized C / N corresponding to the MCS level of the last transmission in the closed loop power control mode, and R _{CL_last} means the number of repetitions for the MCS level of the last transmission in the closed loop power control mode.

In this initial procedure, the capacity determiner 312 determines the initial capacity of the MS after confirming the initial transmit power level and offset. Next, the initial capacity determination in the wireless communication system according to the embodiment of the present invention will be described in more detail with reference to FIG. 11.

11 is a diagram schematically illustrating an initial capacity determination process of the capacity determiner 312 in a wireless communication system according to an embodiment of the present invention.

Referring to FIG. 11, in step S1102, the BS sends a ranging response (RNG-RSP: Ranging Response) message to the MS and then receives the SBC-REQ received from the MS. Check the message. In step S1104, the transmission power control mode is checked, that is, the open loop power control mode or the closed loop power control mode is checked, and in step S1106, the offset calculated according to the power control mode is filtered.

Next, after confirming the initial transmission power level in step S1108, the normalized transmission power level is updated using the filtered offset in step S1110, and the maximum byte is determined in step S1112. In the closed loop power control mode, as described above in step S1108, the initial transmission power level is checked using the current transmission power TLV value in the SBC-REQ message, and in step S1110, the initial transmission power level is normalized. After updating to the level, the maximum byte of the reference MCS level, for example, MCS level excluding QPSK1 / 2 is determined to be set to 0 in step S1112, and accordingly, in the case of the QPSK1 / 2, the maximum byte is allocated at the normalized transmission power level. .

If the SBC-REQ message cannot be confirmed in step S1102, the offset is set to 0 in step S1106, the initial transmission power level is determined as shown in Equation 11 in step S1108, and then normalized transmit power in step S1110. After updating the level, the initial transmission power level is updated to a normalized transmission power level in step S1110, and then determined in step S1112 by setting the maximum byte of the MCS level except for the QPSK1 / 2 to 0.

On the other hand, in the detailed description of the present invention has been described with respect to specific embodiments, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a diagram schematically illustrating the structure of a BS in a wireless communication system according to an embodiment of the present invention.

2 is a diagram schematically illustrating a structure of a scheduler 150 in a wireless communication system according to an embodiment of the present invention.

3 is a diagram schematically illustrating the structure of the operator 210 and the packet scheduler 220 of the scheduler 150 in a wireless communication system according to an embodiment of the present invention.

4 is a diagram schematically illustrating an operation in which a scheduler 150 controls UL scheduling in a wireless communication system according to an embodiment of the present invention.

5 is a diagram schematically illustrating an operation process of the calculator 210 in a wireless communication system according to an exemplary embodiment of the present invention.

6 is a view schematically illustrating an operation process of the capacity determining unit 312 in a wireless communication system according to an embodiment of the present invention.

7 is a diagram schematically illustrating an offset filtering process of the capacity determiner 312 in a wireless communication system according to an embodiment of the present invention.

8 is a diagram schematically illustrating a transmission power level checking and normalized transmission power level updating process of the capacity determiner 312 in a wireless communication system according to an embodiment of the present invention.

9 is a diagram schematically illustrating a transmission power density and a maximum byte determination process of the capacity determiner 312 in a wireless communication system according to an embodiment of the present invention.

10 is a diagram schematically illustrating an operation process of a packet scheduler 220 in a wireless communication system according to an embodiment of the present invention.

11 is a view schematically showing an initial capacity determination process of the capacity determination unit 312 in a wireless communication system according to an embodiment of the present invention.

Claims (25)

A control device in a wireless communication system, An operator for determining a transmission power density and a maximum byte for each MCS (Modulation and Coding Scheme) level applicable to multiple bursts allocated to a mobile station; A packet scheduler for allocating bytes for the multiple bursts at the transmit power density and the maximum byte per MCS level; And And a generator for generating MAP information including scheduling information corresponding to the allocation. The method of claim 1, wherein the calculator, An offset determination unit that determines a power offset of the mobile station; A transmission power confirmation unit for confirming a transmission power report of the mobile station; And And a capacity determiner configured to determine a transmit power density and a maximum byte for each modulation and coding scheme level using the power offset and the transmit power report. The method of claim 2, The calculator normalizes the carrier to interference and noise ratio (CINR) measured for the multiple bursts to a reference MCS level, and adjusts the normalized CINR to an acknowledgment (ACK) / non-acknowledgement (NACK) ratio to adjust the power offset. Determining the control device. The method of claim 3, And the calculator determines the power offset by calculating a difference between the adjusted normalized CINR and a required CINR according to the reference MCS level. The method of claim 2, wherein the calculator, A normalizer for normalizing a carrier to interference and noise ratio (CINR) measured for the multiple bursts to a reference MCS level; A hybrid automatic repeat request (HARQ) checking unit for calculating an ACK / NACK ratio by checking an ACK (acknowledgement) / NACK (non-acknowledgement) message of the mobile station; And And a controller for adjusting the normalized CINR of the normalizer to the ACK / NACK ratio. The method of claim 5, The normalization unit outputs the normalized CINR using the measured CINR, the requested CINR according to the measured CINR, the requested CINR according to the reference MCS level, the relative power offset for the HARQ burst of the mobile station, and the number of repetitions. Control device characterized in that. The method of claim 5, And the adjustment unit calculates an adjustment CINR offset corresponding to the ACK / NACK ratio, and adjusts the normalization CINR by adding the adjustment CINR offset and the normalization CINR. The method of claim 2, The capacity determining unit determines a normalized transmission power level using a recent transmission power level among a transmission power level determined by the byte allocation and a transmission power level determined by the transmission power report, and uses the determined normalized transmission power level. The control device, characterized in that for determining the transmission power density for each MCS level. The method of claim 8, And the capacity determiner adds the power offset to the normalized transmit power level to update the normalized transmit power level. The method of claim 8, And wherein the normalized transmit power level is a power level at which a recent transmit power level, among the transmit power level determined by the byte allocation and the transmit power level determined by the transmit power report, is normalized to a reference MCS level. The method of claim 8, And the capacity determiner updates the normalized transmit power level and the transmit power density for each MCS level by using a relative power offset with respect to a hybrid automatic repeat request (HARQ) burst of the mobile station. The method of claim 2, And the capacity determining unit determines the maximum byte for each MCS level by using the total transmit power available to the mobile station and the number of slots of the total subcarriers available to the mobile station. The method of claim 2, And the capacity determiner determines a maximum MCS level applicable to the multiple bursts, and determines the transmission power density and the maximum byte for each MCS level from the maximum MCS level to the minimum MCS level. The method of claim 13, Wherein the capacity determining unit updates the total available transmit power using the transmit power density and the maximum byte, and determines the maximum byte corresponding to the next MCS level of the maximum MCS level from the updated total transmit power. Control device. The method of claim 2, If the transmission power report is not confirmed, the capacity determining unit determines the normalized transmission power level by using the radiant power of the base station, the reception signal indicator for the mobile station at a preset cell edge, and the cumulative offset of the mobile station. And a transmission power density for each MCS level is determined using a normalized transmission power level. The method of claim 15, The capacity determining unit calculates the total number of usable subchannels using the initial transmission power level for the mobile station's basic capability capability request (SBC-REQ) message, and uses the total number of subchannels to determine the number of SBC-REQ messages. And control the maximum byte for the MCS level. The method of claim 2, The packet scheduler selects an MCS level by checking a transmission power density and a maximum byte for each MCS level, and allocates a byte not exceeding the maximum byte of the selected MCS level to the multiple bursts. The packet scheduler of claim 2, wherein the packet scheduler comprises: A scheduling unit which checks the transmission power density and the maximum byte for each MCS level and performs packet scheduling for the mobile station; A parameter storage unit for storing parameters corresponding to the MAP information; And And an information storage unit for storing the mobile station information including the parameters, the transmission power density for each MCS level, and information on the maximum byte. In the method of controlling in a wireless communication system, Confirming channel information and an acknowledgment (ACK) / non-acknowledgement (NACK) message of the mobile station to determine a power offset and confirming a transmission power report of the mobile station; Determining a capacity of the mobile station using the power offset and the transmit power report; Scheduling a packet at the determined capacity; And Generating MAP information including the scheduling information of the packet scheduling. 20. The method of claim 19, wherein determining the power offset comprises: Calculating a normalized CINR by normalizing a carrier to interference and noise ratio (CINR) measured for multiple bursts allocated to the mobile station to a reference MCS level, and checking the ACK / NACK message to calculate an ACK / NACK ratio; Adjusting the normalized CINR with the ACK / NACK ratio; And And determining the power offset which is a difference value between the adjusted normalized CINR and a required CINR according to the reference MCS level. The method of claim 20, The calculating of the normalized CINR uses the measured CINR, the requested CINR according to the measured CINR, the required CINR according to the reference MCS level, the relative power offset for a HARQ burst, and the number of repetitions. And calculating the normalized CINR. The method of claim 20, The adjusting of the normalized CINR may include determining an adjustment CINR offset corresponding to the ACK / NACK ratio, and adjusting the sum of the adjustment CINR offset and the normalization CINR. The method of claim 19, wherein determining the dose comprises: Determining a normalized transmit power level of the mobile station; And And using the normalized transmit power level, determining a transmit power density and a maximum byte for each Modulation and Coding Scheme (MCS) level applicable to multiple bursts allocated to the mobile station. The method of claim 23, wherein And determining the normalized transmission power level using the latest transmission power level among the transmission power level determined by the byte allocation and the transmission power level determined by the transmission power report. The method of claim 23, wherein And determining the maximum byte per MCS level is determined using the total transmit power available to the mobile station and the number of slots of the total subcarriers available to the mobile station.

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