KR20150010044A - Method and apparatus for transmitting and receiving control signal - Google Patents

Abstract

The present invention relates to a method and an apparatus for transmitting and receiving a signal of a wireless communication system. According to an embodiment of the present invention, provided is a method of transmitting a control signal of a base station, which includes the steps of generating a downlink control information (DCI) including indication information of indicating whether a 256 quadrature amplitude modulation (QAM) applied signal is transmitted to a terminal; and transmitting physical downlink control channel (PDCCH) including the DCI.

Description

TECHNICAL FIELD [0001] The present invention relates to a control signal transmission / reception method,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for transmitting and receiving signals in a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving control signals to and from a terminal.

The wireless communications system away from who provide services in the early voice-oriented, for ^{example, 3GPP (3 rd Generation Partnership Project} ) in HSPA (High Speed Packet Access), LTE (Long Term Evolution), 3GPP2 (3 rd Generation Partnership Project 2, which provides high-speed, high-quality packet data services such as High Rate Packet Data (HRPD), Ultra Mobile Broadband (UMB), and 802.16e of Institute of Electrical and Electronics Engineers Communication system.

In the LTE system, which is a typical example of a broadband wireless communication system, an OFDM (Orthogonal Frequency Division Multiplexing) scheme is adopted as a downlink scheme and a Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme is used as an uplink scheme have. According to the above multiple access scheme, communication devices allocate and operate resources such that time-frequency resources to be transmitted for each user do not overlap with each other, that is, orthogonality is established, Data or control information.

1 is a structure diagram of a downlink radio resource region in an LTE system.

In Fig. 1, the vertical axis represents the time domain and the horizontal axis represents the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol, and N _symb (102) OFDM symbols constitute one slot 106, and two slots form one subframe 105. The length of the slot is 0.5 ms and the length of the subframe is 1.0 ms. The minimum transmission unit in the frequency domain is a subcarrier.

In a time-frequency domain, a basic unit of a resource can be represented by an OFDM symbol index and a subcarrier index as a resource element (RE) 112. A resource block (RB or Physical Resource Block) 108 is defined as N _symb (102) consecutive OFDM symbols in the time domain and N ^RB _SC (110) consecutive subcarriers in the frequency domain. Therefore, one RB 108 is composed of REs 112 of N _symb x N ^RB _SCs . In general, the minimum transmission unit of data is the RB, and the system transmission band is composed of a total of N _RB RBs. And the total system transmission bandwidth consists of a total of N _RB x N ^RB _SC (104) subcarriers. In the LTE system, N _symb = 7 and N ^RB _SC = 12 in general.

The control information is transmitted within the first N OFDM symbols in the subframe. The control channel transmission interval N is generally a value of 1, 2, or 3. Therefore, the value of N varies in each subframe according to the amount of control information to be transmitted in the current subframe. The control information includes an indicator indicating how many OFDM symbols control information is transmitted, scheduling information for uplink or downlink data, a hybrid automatic repeat request (HARQ) ACK / NACK signal, and the like.

In the LTE system, when a decoding failure occurs in the initial transmission, the physical layer employs a HARQ scheme in which the data is retransmitted. The HARQ scheme is a scheme in which, when a receiver fails to correctly decode data, (NACK) to enable the transmitter to retransmit the corresponding data in the physical layer, and the receiver combines the data retransmitted by the transmitter with data that has previously failed decoding, thereby increasing the data reception performance. When decoded correctly, information (ACK) indicating decoding success can be transmitted so that the transmitter can transmit new data.

One of the important things in providing a high-speed wireless data service in a broadband wireless communication system is the support of scalable bandwidth. For example, the system transmission band of the LTE system can have various bandwidths such as 20/15/10/5/3 / 1.4 MHz. Therefore, service providers can provide a service by selecting a specific bandwidth among various bandwidths. There may also be several types of terminals, including those capable of supporting bandwidths of up to 20 MHz, and those supporting only a minimum bandwidth of 1.4 MHz.

In the LTE system, scheduling information for downlink data or uplink data is transmitted from a base station to a mobile station through downlink control information (DCI). An uplink (UL) refers to a radio link through which a terminal transmits data or control signals to a base station, and a downlink (DL) refers to a radio link through which a base station transmits data or control signals to a terminal. The DCI defines various formats to determine whether it is scheduling information (uplink grant) for uplink data or scheduling information (DL (downlink) grant) for downlink data, a compact DCI Whether to apply spatial multiplexing using multiple antennas, whether DCI is used for power control, and the like. For example, DCI format 1, which is scheduling control information (DL grant) for downlink data, is configured to include the following control information.

- Resource allocation type 0/1 flag: Notifies whether the resource allocation method is Type 0 or Type 1. Type 0 allocates resources by resource block group (RBG) by applying bitmap method. In the LTE system, the basic unit of scheduling is an RB (resource block) represented by a time and frequency domain resource, and the RBG is composed of a plurality of RBs and serves as a basic unit of scheduling in the type 0 scheme. Type 1 allows a specific RB to be allocated within the RBG.

- Resource block assignment: Notifies the RB allocated to data transmission. The resources to be represented are determined according to the system bandwidth and the resource allocation method.

- Modulation and coding scheme (MCS): Notifies the modulation scheme used for data transmission and the size of the transport block to be transmitted.

- HARQ process number: Notifies the HARQ process number.

- New data indicator: Notifies HARQ initial transmission or retransmission.

- Redundancy version: Notifies redundancy version of HARQ.

- Transmit power control command for PUCCH (Physical Uplink Control CHannel): Notifies a transmission power control command for PUCCH, which is an uplink control channel.

The DCI is transmitted through a physical downlink control channel (PDCCH), which is a downlink physical control channel, through a channel coding and modulation process.

Generally, the DCI is independently channel-coded for each UE, and then is composed of independent PDCCHs and transmitted. In the time domain, the PDCCH is mapped and transmitted during the control channel transmission period. The frequency domain mapping position of the PDCCH is determined by the identifier (ID) of each terminal and spread over the entire system transmission band.

The downlink data is transmitted through a Physical Downlink Shared Channel (PDSCH), which is a physical channel for downlink data transmission. The PDSCH is transmitted after the control channel transmission interval. The scheduling information such as the specific mapping position in the frequency domain, the modulation scheme, and the like is notified by the DCI transmitted through the PDCCH.

The base station notifies the UE of a modulation scheme applied to a PDSCH to be transmitted and a transport block size (TBS) to be transmitted through an MCS having 5 bits among the control information constituting the DCI. The TBS corresponds to a size before channel coding for error correction is applied to data to be transmitted by the base station.

The modulation schemes supported by the LTE system are QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), and 64QAM, and the respective modulation orders (Q _m ) correspond to 2, 4, and 6, respectively. That is, 2 bits per symbol for QPSK modulation, 4 bits per symbol for 16QAM modulation, and 6 bits per symbol for 64QAM modulation.

The present disclosure relates to a method for scheduling data for a terminal in a communication system supporting a higher order modulation scheme. Specifically, a method of configuring scheduling information to support a higher order modulation scheme and a method of determining scheduling information of a UE are provided.

A control signal transmission method of a base station according to some embodiments of the present disclosure includes downlink control information (DCI) including indication information indicating whether to transmit a signal to which a 256QAM (Quadrature Amplitude Modulation) And transmitting a Physical Downlink Control Channel (PDCCH) including the DCI.

A method of transmitting a control signal of a base station according to some embodiments of the present invention includes generating downlink control information (DCI) to be applied to a mobile station, and transmitting a signal to which a 256QAM (Quadrature Amplitude Modulation) And transmitting the DCI in the Physical Downlink Control Channel (PDCCH) having the CCE (Conrol Channel Element) having the even index as the start CCE if the CCE is determined to be transmitted.

A method of receiving a control signal of a terminal according to some embodiments of the present invention includes receiving a Physical Downlink Control Channel (PDCCH) including downlink control information (DCI) from a base station and receiving a 256QAM (Quadrature And acquiring indication information indicating whether to transmit a signal to which the amplitude modulation is applied.

A method of receiving a control signal of a terminal according to some embodiments of the present invention includes receiving a Physical Downlink Control Channel (PDCCH) from a base station and transmitting the control signal to the terminal when the CCE index of the start CCE of the PDCCH is an even number And determining that the signal to which 256QAM (Quadrature Amplitude Modulation) is applied is transmitted.

As described above, the present specification defines a scheduling method for supporting a higher order modulation scheme in a wireless communication system, thereby improving system transmission efficiency.

1 is a structure diagram of a downlink radio resource region in an LTE system.
2 is a flowchart of a process of transmitting scheduling information by a base station according to the first embodiment of the present invention.
3 is a flowchart of a scheduling information reception procedure according to the first embodiment.
4 is a flowchart of a process of transmitting scheduling information according to the second embodiment of the present invention.
5 is a flowchart of a scheduling information receiving process according to the second embodiment of the present invention.
6 is a resource configuration diagram according to the fourth embodiment of the present invention.
7 is a flowchart of a scheduling information transmission process according to the fourth embodiment of the present invention.
8 is a flowchart of a scheduling information receiving process according to the fourth embodiment of the present invention.
9 is a schematic diagram of a TBS acquisition process according to the fifth embodiment of the present invention.
10 is a flowchart of a TBS acquisition process according to the fifth embodiment of the present invention. 11 is a flowchart of a TBS acquisition procedure according to the sixth embodiment of the present invention.
12 is a block diagram of a base station according to at least some embodiments of the present disclosure.
13 is a block diagram of a terminal according to at least some embodiments of the present disclosure.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiments of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention unclear. It is to be understood that the following terms are defined in consideration of the functions in this specification and may vary depending on the user, the intention or custom of the operator, and the like. Therefore, the definition should be based on the contents throughout this specification. Hereinafter, the base station may be at least one of eNode B, eNB, Node B, Base Station (BS), radio access unit, base station controller, or node on the network.

The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing communication functions. It should be noted that the present specification describes a specific embodiment by way of example of E-UTRA (or LTE) or Advanced E-UTRA (or LTE-A) system, The embodiment of the present invention can be applied to the system. Further, the embodiments of the present invention can be applied to other communication systems through some modifications, without departing from the scope of the present invention, at the judgment of a person skilled in the art.

The present specification defines a scheduling method to support Higher Order Modulation such as 256QAM. Specifically, a scheduling information configuration method for a data channel to which a 256QAM modulation scheme is applied and a scheduling information determination method for a UE are proposed

Hereinafter, a scheduling method for supporting 256QAM will be described with reference to a specific embodiment.

Table 1 shows modulation scheme and TBS index according to MCS in LTE system. For example, if the MCS is '10' (I _MCS = 10), the modulation scheme is 16QAM and the TBS index (I _TBS ) is 9.

MCS Index
I _MCS Modulation Order Q _m TBS Index
I _TBS 0 2 0 One 2 One 2 2 2 3 2 3 4 2 4 5 2 5 6 2 6 7 2 7 8 2 8 9 2 9 10 4 9 11 4 10 12 4 11 13 4 12 14 4 13 15 4 14 16 4 15 17 6 15 18 6 16 19 6 17 20 6 18 21 6 19 22 6 20 23 6 21 24 6 22 25 6 23 26 6 24 27 6 25 28 6 26 29 2 reserved 30 4 31 6

The size (TBS) of downlink data transmitted to the UE is determined by the number of RBs allocated to the UE (N _PRB ) and the TBS index (I _TBS ).

Tables 2 to 12 show TBS tables defined in the LTE system. _TBS can be determined by I _TBS and N _PRB .

For example, it is assumed that the base station informs the terminal of N _PRB = 10 through resource block assignment control information configuring the DCI, and notifies I _MCS = 10 through _MCS . In this case, the TBS index (I _TBS ) is 9 according to Table 1, and TBS is 1544 according to Tables 2 to 12.

I _TBS N _PRB One 2 3 4 5 6 7 8 9 10 0 16 32 56 88 120 152 176 208 224 256 One 24 56 88 144 176 208 224 256 328 344 2 32 72 144 176 208 256 296 328 376 424 3 40 104 176 208 256 328 392 440 504 568 4 56 120 208 256 328 408 488 552 632 696 5 72 144 224 328 424 504 600 680 776 872 6 328 176 256 392 504 600 712 808 936 1032 7 104 224 328 472 584 712 840 968 1096 1224 8 120 256 392 536 680 808 968 1096 1256 1384 9 136 296 456 616 776 936 1096 1256 1416 1544 10 144 328 504 680 872 1032 1224 1384 1544 1736 11 176 376 584 776 1000 1192 1384 1608 1800 2024 12 208 440 680 904 1128 1352 1608 1800 2024 2280 13 224 488 744 1000 1256 1544 1800 2024 2280 2536 14 256 552 840 1128 1416 1736 1992 2280 2600 2856 15 280 600 904 1224 1544 1800 2152 2472 2728 3112 16 328 632 968 1288 1608 1928 2280 2600 2984 3240 17 336 696 1064 1416 1800 2152 2536 2856 3240 3624 18 376 776 1160 1544 1992 2344 2792 3112 3624 4008 19 408 840 1288 1736 2152 2600 2984 3496 3880 4264 20 440 904 1384 1864 2344 2792 3240 3752 4136 4584 21 488 1000 1480 1992 2472 2984 3496 4008 4584 4968 22 520 1064 1608 2152 2664 3240 3752 4264 4776 5352 23 552 1128 1736 2280 2856 3496 4008 4584 5160 5736 24 584 1192 1800 2408 2984 3624 4264 4968 5544 5992 25 616 1256 1864 2536 3112 3752 4392 5160 5736 6200 26 712 1480 2216 2984 3752 4392 5160 5992 6712 7480

I _TBS N _PRB 11 12 13 14 15 16 17 18 19 20 0 288 328 344 376 392 424 456 488 504 536 One 376 424 456 488 520 568 600 632 680 712 2 472 520 568 616 648 696 744 776 840 872 3 616 680 744 808 872 904 968 1032 1096 1160 4 776 840 904 1000 1064 1128 1192 1288 1352 1416 5 968 1032 1128 1224 1320 1384 1480 1544 1672 1736 6 1128 1224 1352 1480 1544 1672 1736 1864 1992 2088 7 1320 1480 1608 1672 1800 1928 2088 2216 2344 2472 8 1544 1672 1800 1928 2088 2216 2344 2536 2664 2792 9 1736 1864 2024 2216 2344 2536 2664 2856 2984 3112 10 1928 2088 2280 2472 2664 2792 2984 3112 3368 3496 11 2216 2408 2600 2792 2984 3240 3496 3624 3880 4008 12 2472 2728 2984 3240 3368 3624 3880 4136 4392 4584 13 2856 3112 3368 3624 3880 4136 4392 4584 4968 5160 14 3112 3496 3752 4008 4264 4584 4968 5160 5544 5736 15 3368 3624 4008 4264 4584 4968 5160 5544 5736 6200 16 3624 3880 4264 4584 4968 5160 5544 5992 6200 6456 17 4008 4392 4776 5160 5352 5736 6200 6456 6712 7224 18 4392 4776 5160 5544 5992 6200 6712 7224 7480 7992 19 4776 5160 5544 5992 6456 6968 7224 7736 8248 8504 20 5160 5544 5992 6456 6968 7480 7992 8248 8760 9144 21 5544 5992 6456 6968 7480 7992 8504 9144 9528 9912 22 5992 6456 6968 7480 7992 8504 9144 9528 10296 10680 23 6200 6968 7480 7992 8504 9144 9912 10296 11064 11448 24 6712 7224 7992 8504 9144 9912 10296 11064 11448 12216 25 6968 7480 8248 8760 9528 10296 10680 11448 12216 12576 26 8248 8760 9528 10296 11064 11832 12576 13536 14112 14688

I _TBS N _PRB 21 22 23 24 25 26 27 28 29 30 0 568 600 616 648 680 712 744 776 776 808 One 744 776 808 872 904 936 968 1000 1032 1064 2 936 968 1000 1064 1096 1160 1192 1256 1288 1320 3 1224 1256 1320 1384 1416 1480 1544 1608 1672 1736 4 1480 1544 1608 1736 1800 1864 1928 1992 2088 2152 5 1864 1928 2024 2088 2216 2280 2344 2472 2536 2664 6 2216 2280 2408 2472 2600 2728 2792 2984 2984 3112 7 2536 2664 2792 2984 3112 3240 3368 3368 3496 3624 8 2984 3112 3240 3368 3496 3624 3752 3880 4008 4264 9 3368 3496 3624 3752 4008 4136 4264 4392 4584 4776 10 3752 3880 4008 4264 4392 4584 4776 4968 5160 5352 11 4264 4392 4584 4776 4968 5352 5544 5736 5992 5992 12 4776 4968 5352 5544 5736 5992 6200 6456 6712 6712 13 5352 5736 5992 6200 6456 6712 6968 7224 7480 7736 14 5992 6200 6456 6968 7224 7480 7736 7992 8248 8504 15 6456 6712 6968 7224 7736 7992 8248 8504 8760 9144 16 6712 7224 7480 7736 7992 8504 8760 9144 9528 9912 17 7480 7992 8248 8760 9144 9528 9912 10296 10296 10680 18 8248 8760 9144 9528 9912 10296 10680 11064 11448 11832 19 9144 9528 9912 10296 10680 11064 11448 12216 12576 12960 20 9912 10296 10680 11064 11448 12216 12576 12960 13536 14112 21 10680 11064 11448 12216 12576 12960 13536 14112 14688 15264 22 11448 11832 12576 12960 13536 14112 14688 15264 15840 16416 23 12216 12576 12960 13536 14112 14688 15264 15840 16416 16992 24 12960 13536 14112 14688 15264 15840 16416 16992 17568 18336 25 13536 14112 14688 15264 15840 16416 16992 17568 18336 19080 26 15264 16416 16992 17568 18336 19080 19848 20616 21384 22152

I _TBS N _PRB 31 32 33 34 35 36 37 38 39 40 0 840 872 904 936 968 1000 1032 1032 1064 1096 One 1128 1160 1192 1224 1256 1288 1352 1384 1416 1416 2 1384 1416 1480 1544 1544 1608 1672 1672 1736 1800 3 1800 1864 1928 1992 2024 2088 2152 2216 2280 2344 4 2216 2280 2344 2408 2472 2600 2664 2728 2792 2856 5 2728 2792 2856 2984 3112 3112 3240 3368 3496 3496 6 3240 3368 3496 3496 3624 3752 3880 4008 4136 4136 7 3752 3880 4008 4136 4264 4392 4584 4584 4776 4968 8 4392 4584 4584 4776 4968 4968 5160 5352 5544 5544 9 4968 5160 5160 5352 5544 5736 5736 5992 6200 6200 10 5544 5736 5736 5992 6200 6200 6456 6712 6712 6968 11 6200 6456 6712 6968 6968 7224 7480 7736 7736 7992 12 6968 7224 7480 7736 7992 8248 8504 8760 8760 9144 13 7992 8248 8504 8760 9144 9144 9528 9912 9912 10296 14 8760 9144 9528 9912 9912 10296 10680 11064 11064 11448 15 9528 9912 10296 10296 10680 11064 11448 11832 11832 12216 16 9912 10296 10680 11064 11448 11832 12216 12216 12576 12960 17 11064 11448 11832 12216 12576 12960 13536 13536 14112 14688 18 12216 12576 12960 13536 14112 14112 14688 15264 15264 15840 19 13536 13536 14112 14688 15264 15264 15840 16416 16992 16992 20 14688 14688 15264 15840 16416 16992 16992 17568 18336 18336 21 15840 15840 16416 16992 17568 18336 18336 19080 19848 19848 22 16992 16992 17568 18336 19080 19080 19848 20616 21384 21384 23 17568 18336 19080 19848 19848 20616 21384 22152 22152 22920 24 19080 19848 19848 20616 21384 22152 22920 22920 23688 24496 25 19848 20616 20616 21384 22152 22920 23688 24496 24496 25456 26 22920 23688 24496 25456 25456 26416 27376 28336 29296 29296

I _TBS N _PRB 41 42 43 44 45 46 47 48 49 50 0 1128 1160 1192 1224 1256 1256 1288 1320 1352 1384 One 1480 1544 1544 1608 1608 1672 1736 1736 1800 1800 2 1800 1864 1928 1992 2024 2088 2088 2152 2216 2216 3 2408 2472 2536 2536 2600 2664 2728 2792 2856 2856 4 2984 2984 3112 3112 3240 3240 3368 3496 3496 3624 5 3624 3752 3752 3880 4008 4008 4136 4264 4392 4392 6 4264 4392 4584 4584 4776 4776 4968 4968 5160 5160 7 4968 5160 5352 5352 5544 5736 5736 5992 5992 6200 8 5736 5992 5992 6200 6200 6456 6456 6712 6968 6968 9 6456 6712 6712 6968 6968 7224 7480 7480 7736 7992 10 7224 7480 7480 7736 7992 7992 8248 8504 8504 8760 11 8248 8504 8760 8760 9144 9144 9528 9528 9912 9912 12 9528 9528 9912 9912 10296 10680 10680 11064 11064 11448 13 10680 10680 11064 11448 11448 11832 12216 12216 12576 12960 14 11832 12216 12216 12576 12960 12960 13536 13536 14112 14112 15 12576 12960 12960 13536 13536 14112 14688 14688 15264 15264 16 13536 13536 14112 14112 14688 14688 15264 15840 15840 16416 17 14688 15264 15264 15840 16416 16416 16992 17568 17568 18336 18 16416 16416 16992 17568 17568 18336 18336 19080 19080 19848 19 17568 18336 18336 19080 19080 19848 20616 20616 21384 21384 20 19080 19848 19848 20616 20616 21384 22152 22152 22920 22920 21 20616 21384 21384 22152 22920 22920 23688 24496 24496 25456 22 22152 22920 22920 23688 24496 24496 25456 25456 26416 27376 23 23688 24496 24496 25456 25456 26416 27376 27376 28336 28336 24 25456 25456 26416 26416 27376 28336 28336 29296 29296 30576 25 26416 26416 27376 28336 28336 29296 29296 30576 31704 31704 26 30576 30576 31704 32856 32856 34008 35160 35160 36696 36696

I _TBS N _PRB 51 52 53 54 55 56 57 58 59 60 0 1416 1416 1480 1480 1544 1544 1608 1608 1608 1672 One 1864 1864 1928 1992 1992 2024 2088 2088 2152 2152 2 2280 2344 2344 2408 2472 2536 2536 2600 2664 2664 3 2984 2984 3112 3112 3240 3240 3368 3368 3496 3496 4 3624 3752 3752 3880 4008 4008 4136 4136 4264 4264 5 4584 4584 4776 4776 4776 4968 4968 5160 5160 5352 6 5352 5352 5544 5736 5736 5992 5992 5992 6200 6200 7 6200 6456 6456 6712 6712 6712 6968 6968 7224 7224 8 7224 7224 7480 7480 7736 7736 7992 7992 8248 8504 9 7992 8248 8248 8504 8760 8760 9144 9144 9144 9528 10 9144 9144 9144 9528 9528 9912 9912 10296 10296 10680 11 10296 10680 10680 11064 11064 11448 11448 11832 11832 12216 12 11832 11832 12216 12216 12576 12576 12960 12960 13536 13536 13 12960 13536 13536 14112 14112 14688 14688 14688 15264 15264 14 14688 14688 15264 15264 15840 15840 16416 16416 16992 16992 15 15840 15840 16416 16416 16992 16992 17568 17568 18336 18336 16 16416 16992 16992 17568 17568 18336 18336 19080 19080 19848 17 18336 19080 19080 19848 19848 20616 20616 20616 21384 21384 18 19848 20616 21384 21384 22152 22152 22920 22920 23688 23688 19 22152 22152 22920 22920 23688 24496 24496 25456 25456 25456 20 23688 24496 24496 25456 25456 26416 26416 27376 27376 28336 21 25456 26416 26416 27376 27376 28336 28336 29296 29296 30576 22 27376 28336 28336 29296 29296 30576 30576 31704 31704 32856 23 29296 29296 30576 30576 31704 31704 32856 32856 34008 34008 24 31704 31704 32856 32856 34008 34008 35160 35160 36696 36696 25 32856 32856 34008 34008 35160 35160 36696 36696 37888 37888 26 37888 37888 39232 40576 40576 40576 42368 42368 43816 43816

I _TBS N _PRB 61 62 63 64 65 66 67 68 69 70 0 1672 1736 1736 1800 1800 1800 1864 1864 1928 1928 One 2216 2280 2280 2344 2344 2408 2472 2472 2536 2536 2 2728 2792 2856 2856 2856 2984 2984 3112 3112 3112 3 3624 3624 3624 3752 3752 3880 3880 4008 4008 4136 4 4392 4392 4584 4584 4584 4776 4776 4968 4968 4968 5 5352 5544 5544 5736 5736 5736 5992 5992 5992 6200 6 6456 6456 6456 6712 6712 6968 6968 6968 7224 7224 7 7480 7480 7736 7736 7992 7992 8248 8248 8504 8504 8 8504 8760 8760 9144 9144 9144 9528 9528 9528 9912 9 9528 9912 9912 10296 10296 10296 10680 10680 11064 11064 10 10680 11064 11064 11448 11448 11448 11832 11832 12216 12216 11 12216 12576 12576 12960 12960 13536 13536 13536 14112 14112 12 14112 14112 14112 14688 14688 15264 15264 15264 15840 15840 13 15840 15840 16416 16416 16992 16992 16992 17568 17568 18336 14 17568 17568 18336 18336 18336 19080 19080 19848 19848 19848 15 18336 19080 19080 19848 19848 20616 20616 20616 21384 21384 16 19848 19848 20616 20616 21384 21384 22152 22152 22152 22920 17 22152 22152 22920 22920 23688 23688 24496 24496 24496 25456 18 24496 24496 24496 25456 25456 26416 26416 27376 27376 27376 19 26416 26416 27376 27376 28336 28336 29296 29296 29296 30576 20 28336 29296 29296 29296 30576 30576 31704 31704 31704 32856 21 30576 31704 31704 31704 32856 32856 34008 34008 35160 35160 22 32856 34008 34008 34008 35160 35160 36696 36696 36696 37888 23 35160 35160 36696 36696 37888 37888 37888 39232 39232 40576 24 36696 37888 37888 39232 39232 40576 40576 42368 42368 42368 25 39232 39232 40576 40576 40576 42368 42368 43816 43816 43816 26 45352 45352 46888 46888 48936 48936 48936 51024 51024 52752

I _TBS N _PRB 71 72 73 74 75 76 77 78 79 80 0 1992 1992 2024 2088 2088 2088 2152 2152 2216 2216 One 2600 2600 2664 2728 2728 2792 2792 2856 2856 2856 2 3240 3240 3240 3368 3368 3368 3496 3496 3496 3624 3 4136 4264 4264 4392 4392 4392 4584 4584 4584 4776 4 5160 5160 5160 5352 5352 5544 5544 5544 5736 5736 5 6200 6200 6456 6456 6712 6712 6712 6968 6968 6968 6 7480 7480 7736 7736 7736 7992 7992 8248 8248 8248 7 8760 8760 8760 9144 9144 9144 9528 9528 9528 9912 8 9912 9912 10296 10296 10680 10680 10680 11064 11064 11064 9 11064 11448 11448 11832 11832 11832 12216 12216 12576 12576 10 12576 12576 12960 12960 12960 13536 13536 13536 14112 14112 11 14112 14688 14688 14688 15264 15264 15840 15840 15840 16416 12 16416 16416 16416 16992 16992 17568 17568 17568 18336 18336 13 18336 18336 19080 19080 19080 19848 19848 19848 20616 20616 14 20616 20616 20616 21384 21384 22152 22152 22152 22920 22920 15 22152 22152 22152 22920 22920 23688 23688 23688 24496 24496 16 22920 23688 23688 24496 24496 24496 25456 25456 25456 26416 17 25456 26416 26416 26416 27376 27376 27376 28336 28336 29296 18 28336 28336 29296 29296 29296 30576 30576 30576 31704 31704 19 30576 30576 31704 31704 32856 32856 32856 34008 34008 34008 20 32856 34008 34008 34008 35160 35160 35160 36696 36696 36696 21 35160 36696 36696 36696 37888 37888 39232 39232 39232 40576 22 37888 39232 39232 40576 40576 40576 42368 42368 42368 43816 23 40576 40576 42368 42368 43816 43816 43816 45352 45352 45352 24 43816 43816 45352 45352 45352 46888 46888 46888 48936 48936 25 45352 45352 46888 46888 46888 48936 48936 48936 51024 51024 26 52752 52752 55056 55056 55056 55056 57336 57336 57336 59256

I _TBS N _PRB 81 82 83 84 85 86 87 88 89 90 0 2280 2280 2280 2344 2344 2408 2408 2472 2472 2536 One 2984 2984 2984 3112 3112 3112 3240 3240 3240 3240 2 3624 3624 3752 3752 3880 3880 3880 4008 4008 4008 3 4776 4776 4776 4968 4968 4968 5160 5160 5160 5352 4 5736 5992 5992 5992 5992 6200 6200 6200 6456 6456 5 7224 7224 7224 7480 7480 7480 7736 7736 7736 7992 6 8504 8504 8760 8760 8760 9144 9144 9144 9144 9528 7 9912 9912 10296 10296 10296 10680 10680 10680 11064 11064 8 11448 11448 11448 11832 11832 12216 12216 12216 12576 12576 9 12960 12960 12960 13536 13536 13536 13536 14112 14112 14112 10 14112 14688 14688 14688 14688 15264 15264 15264 15840 15840 11 16416 16416 16992 16992 16992 17568 17568 17568 18336 18336 12 18336 19080 19080 19080 19080 19848 19848 19848 20616 20616 13 20616 21384 21384 21384 22152 22152 22152 22920 22920 22920 14 22920 23688 23688 24496 24496 24496 25456 25456 25456 25456 15 24496 25456 25456 25456 26416 26416 26416 27376 27376 27376 16 26416 26416 27376 27376 27376 28336 28336 28336 29296 29296 17 29296 29296 30576 30576 30576 30576 31704 31704 31704 32856 18 31704 32856 32856 32856 34008 34008 34008 35160 35160 35160 19 35160 35160 35160 36696 36696 36696 37888 37888 37888 39232 20 37888 37888 39232 39232 39232 40576 40576 40576 42368 42368 21 40576 40576 42368 42368 42368 43816 43816 43816 45352 45352 22 43816 43816 45352 45352 45352 46888 46888 46888 48936 48936 23 46888 46888 46888 48936 48936 48936 51024 51024 51024 51024 24 48936 51024 51024 51024 52752 52752 52752 52752 55056 55056 25 51024 52752 52752 52752 55056 55056 55056 55056 57336 57336 26 59256 59256 61664 61664 61664 63776 63776 63776 66592 66592

I _TBS N _PRB 91 92 93 94 95 96 97 98 99 100 0 2536 2536 2600 2600 2664 2664 2728 2728 2728 2792 One 3368 3368 3368 3496 3496 3496 3496 3624 3624 3624 2 4136 4136 4136 4264 4264 4264 4392 4392 4392 4584 3 5352 5352 5352 5544 5544 5544 5736 5736 5736 5736 4 6456 6456 6712 6712 6712 6968 6968 6968 6968 7224 5 7992 7992 8248 8248 8248 8504 8504 8760 8760 8760 6 9528 9528 9528 9912 9912 9912 10296 10296 10296 10296 7 11064 11448 11448 11448 11448 11832 11832 11832 12216 12216 8 12576 12960 12960 12960 13536 13536 13536 13536 14112 14112 9 14112 14688 14688 14688 15264 15264 15264 15264 15840 15840 10 15840 16416 16416 16416 16992 16992 16992 16992 17568 17568 11 18336 18336 19080 19080 19080 19080 19848 19848 19848 19848 12 20616 21384 21384 21384 21384 22152 22152 22152 22920 22920 13 23688 23688 23688 24496 24496 24496 25456 25456 25456 25456 14 26416 26416 26416 27376 27376 27376 28336 28336 28336 28336 15 28336 28336 28336 29296 29296 29296 29296 30576 30576 30576 16 29296 30576 30576 30576 30576 31704 31704 31704 31704 32856 17 32856 32856 34008 34008 34008 35160 35160 35160 35160 36696 18 36696 36696 36696 37888 37888 37888 37888 39232 39232 39232 19 39232 39232 40576 40576 40576 40576 42368 42368 42368 43816 20 42368 42368 43816 43816 43816 45352 45352 45352 46888 46888 21 45352 46888 46888 46888 46888 48936 48936 48936 48936 51024 22 48936 48936 51024 51024 51024 51024 52752 52752 52752 55056 23 52752 52752 52752 55056 55056 55056 55056 57336 57336 57336 24 55056 57336 57336 57336 57336 59256 59256 59256 61664 61664 25 57336 59256 59256 59256 61664 61664 61664 61664 63776 63776 26 66592 68808 68808 68808 71112 71112 71112 73712 73712 75376

I _TBS N _PRB 101 102 103 104 105 106 107 108 109 110 0 2792 2856 2856 2856 2984 2984 2984 2984 2984 3112 One 3752 3752 3752 3752 3880 3880 3880 4008 4008 4008 2 4584 4584 4584 4584 4776 4776 4776 4776 4968 4968 3 5992 5992 5992 5992 6200 6200 6200 6200 6456 6456 4 7224 7224 7480 7480 7480 7480 7736 7736 7736 7992 5 8760 9144 9144 9144 9144 9528 9528 9528 9528 9528 6 10680 10680 10680 10680 11064 11064 11064 11448 11448 11448 7 12216 12576 12576 12576 12960 12960 12960 12960 13536 13536 8 14112 14112 14688 14688 14688 14688 15264 15264 15264 15264 9 15840 16416 16416 16416 16416 16992 16992 16992 16992 17568 10 17568 18336 18336 18336 18336 18336 19080 19080 19080 19080 11 20616 20616 20616 21384 21384 21384 21384 22152 22152 22152 12 22920 23688 23688 23688 23688 24496 24496 24496 24496 25456 13 26416 26416 26416 26416 27376 27376 27376 27376 28336 28336 14 29296 29296 29296 29296 30576 30576 30576 30576 31704 31704 15 30576 31704 31704 31704 31704 32856 32856 32856 34008 34008 16 32856 32856 34008 34008 34008 34008 35160 35160 35160 35160 17 36696 36696 36696 37888 37888 37888 39232 39232 39232 39232 18 40576 40576 40576 40576 42368 42368 42368 42368 43816 43816 19 43816 43816 43816 45352 45352 45352 46888 46888 46888 46888 20 46888 46888 48936 48936 48936 48936 48936 51024 51024 51024 21 51024 51024 51024 52752 52752 52752 52752 55056 55056 55056 22 55056 55056 55056 57336 57336 57336 57336 59256 59256 59256 23 57336 59256 59256 59256 59256 61664 61664 61664 61664 63776 24 61664 61664 63776 63776 63776 63776 66592 66592 66592 66592 25 63776 63776 66592 66592 66592 66592 68808 68808 68808 71112 26 75376 75376 75376 75376 75376 75376 75376 75376 75376 75376

Currently, 3GPP is considering the introduction of higher order modulation schemes such as 256QAM to improve the transmission efficiency of LTE systems. In the case of 256QAM, modulation order = 8, 8 bits can be transmitted per modulation symbol, and transmission efficiency is higher than 33% of 64QAM. This specification proposes concrete scheduling information configuration method and terminal scheduling information determination method for supporting 256QAM.

≪ Embodiment 1 >

The first embodiment of the present invention is a scheduling information configuration method for 256QAM support. Append additional 'control information A' to the DCI defined in the existing LTE or LTE-A system. The control information A is an exemplary name, and the actual name may be different. Through the added 'control information A', the base station can notify the terminal of the modulation scheme of the data to be transmitted and the determination method of the TBS.

For example, it is assumed that the added 'control information A' consists of 1 bit. In this case, if the MS determines that 1 bit of the 'control information A' is '0', the MS selects a modulation scheme and a TBS (modulation scheme) according to a scheme that does not support 256QAM among the LTE or LTE- .

On the other hand, if the UE determines that the 'control information A' bit is '1', it determines that the modulation scheme is 256QAM, and the TBS is a TBS determination method for 256QAM described in the following fifth embodiment, Acquired according to other methods that can be substituted.

According to another example, if the 'control information A' = '1', the UE determines the modulation scheme and the TBS according to a method defined in the existing LTE or LTE-A system or the like, If A '=' 0 ', the UE determines that the modulation scheme is 256QAM, and the TBS acquires the TBS determination method for 256QAM described in the following fifth embodiment, or another method similar or similar thereto do.

2 is a flowchart of a process of transmitting scheduling information by a base station according to the first embodiment of the present invention.

In step 200, the base station determines whether the terminal to which the service is provided supports 256QAM. The MS may transmit information indicating whether or not to support 256QAM to the BS through signaling. If the terminal does not support 256QAM, the process proceeds to step 202. In step 202, the BS determines whether the PDSCH is scheduled for the UE. When the BS determines PDSCH scheduling for the UE, a first DCI configuration method that does not support 256QAM is performed in step 204. For example, a DCI scheme for scheduling the PDSCH according to a method defined in an existing LTE or LTE- . In this case, the modulation scheme of the PDSCH can be determined to be one of QPSK, 16QAM, and 64QAM. In step 206, the base station generates a PDCCH including the configured DCI and transmits the PDCCH to the UE.

If the base station determines in step 200 that the terminal supports 256QAM, the process moves to step 208. In step 208, the BS determines a DCI configuration method for scheduling the MS and notifies the MS of the method. Although the terminal supports 256QAM, the application of 256QAM may not be suitable depending on the channel status of the terminal, the location in the cell of the terminal, and the like. Therefore, in consideration of the channel condition of the UE, the location of the UE in the cell, etc., the BS applies the existing DCI configuration or the DCI configuration scheme that does not support 256QAM to the UE, A DCI different from A is applied to determine whether to support 256QAM. The base station informs the UE of the DCI configuration method determined in step 208 through explicit signaling or indirectly informs the terminal of the DCI configuration method so that the terminal does not receive any confusion in receiving and interpreting the DCI. If it is determined in step 208 that the base station schedules the mobile station in a DCI configuration method defined in the existing LTE or LTE-A system or in a configuration in which the other 256QAM is not supported, the mobile station moves to step 202 and performs the corresponding procedure. If the base station determines to schedule the UE in a manner supporting 256QAM in step 208, the process proceeds to step 210.

In step 210, the BS determines whether the PDSCH is scheduled for the UE. If the base station determines PDSCH scheduling for the UE, the DCI is configured to schedule the PDSCH by adding the 'control information A' to the DCI defined in the existing LTE or LTE-A system in step 212. FIG. In this case, the modulation scheme of the PDSCH can be determined to be one of QPSK, 16QAM, 64QAM, and 256QAM. In step 214, the base station generates a PDCCH including the configured DCI and transmits the PDCCH to the UE. Control information A is an indicator indicating whether to apply 256QAM, and control information A may be included in an additional field of a new DCI format. According to another embodiment, the control information A may be included in the corresponding field by using some fields of the already known DCI format as the fields for the control information A.

3 is a flowchart of a scheduling information reception procedure according to the first embodiment. In step 300, the UE receives a notification from the base station through explicit signaling of the indication information on the DCI configuration method for scheduling the UE, or is indirectly notified. If the UE is notified that it will be scheduled according to the DCI configuration scheme defined in the existing LTE or LTE-A system, or the DCI configuration scheme that does not support 256QAM (the first DCI configuration method), the process proceeds to step 302 . In step 302, the UE attempts to receive a PDCCH including a DCI generated by an existing DCI configuration scheme or a DCI configuration scheme that does not support 256QAM. If the UE receives the PDCCH, the UE determines a DCI for scheduling PDSCH according to a scheme defined in the existing LTE or LTE-A system or a DCI configuration scheme not supporting 256QAM in step 304. In this case, the modulation scheme of the PDSCH can be determined to be one of QPSK, 16QAM, and 64QAM.

If it is notified in step 300 that the UE is to be scheduled according to the DCI configuration method including control information A, the process proceeds to step 306. In step 306, the UE attempts to receive a PDCCH including DCI including 'control information A'. When the UE receives the PDCCH, in step 308, according to the value of the 'control information A', when the control information A indicates to follow the existing DCI determination method or other DCI configuration method that does not support 256QAM, To determine the DCI scheduling PDSCH according to the method defined in the existing LTE or LTE-A system, or according to the DCI configuration method that does not support 256QAM. In this case, the modulation scheme of the PDSCH can be determined to be one of QPSK, 16QAM, and 64QAM. If it is determined in step 308 that the 'control information A' is to follow the existing DCI determination method or the method for supporting the 256QAM other than the DCI configuration method that does not support 256QAM, the process moves to step 310. In step 310, the UE determines that the modulation scheme of the PDSCH is 256QAM, and the TBS of the PDSCH determines the TBS for the 256QAM in accordance with the fifth embodiment described below or a TBS determination method that replaces the TBS of the PDSCH.

≪ Embodiment 2 >

The second embodiment of the present disclosure relates to a method for configuring scheduling information for 256QAM support. According to the second embodiment, the DCI format defined in the existing LTE or LTE-A system or the size of the DCI format that does not support the other 256QAM is maintained, and the MCS control information constituting the DCI is stored in the DCI format Can be defined differently. For example, the 5-bit MCS control information may include 'control information B' indicating a modulation scheme and 'control information C' indicating a TBS. For example, the 'control information B' is composed of 2 bits, and if the control information B is '00', QPSK, '01', '16QAM', '10' . The 'control information C' is composed of 3 bits, and the control information C indicates a specific TBS.

4 is a flowchart of a process of transmitting scheduling information according to the second embodiment of the present invention. The procedure other than the step 412 is the same as the description of FIG. 2 of the first embodiment, and therefore will not be described. For example, the processes of steps 402, 404, 406, 408, and 410 correspond to steps 202, 204, 206, 208,

In step 412, the base station modifies the DCI format that does not support 256QAM and divides the MCS control information included in the DCI format into 'control information B' indicating a modulation scheme and 'control information C' indicating a TBS . At this time, the sum of the 'control information B' and the 'control information C' is equal to the size of the MCS control information of the DCI format which does not support 256QAM.

5 is a flowchart of a scheduling information receiving process according to the second embodiment of the present invention. Likewise, the description of the steps that are the same as those in the description of FIG. 3 of the first embodiment will be omitted. For example, the configurations of steps 500, 502, and 504 of FIG. 5 are the same as and / or similar to those of steps 300, 302, and 304 of FIG.

In step 500, the terminal receives the indication information on the DCI configuration method from the base station and determines based on the DCI configuration method whether the indicated DCI configuration method supports the 256QAM (a method corresponding to the procedure of steps 506 and 508). If the indicated DCI configuration method is in a manner to support 256QAM, the process proceeds to step 506. [

In step 506, the UE attempts to receive a PDCCH including DCI including 'control information B' and 'control information C'. When the UE receives the PDCCH, it determines the modulation scheme of the PDSCH by referring to the 'control information B' in step 508, and refers to the control information C 'to change the TBS of the PDSCH to the sixth embodiment It is judged according to the method. In this case, the modulation scheme of the PDSCH can be determined to be one of QPSK, 16QAM, 64QAM, and 256QAM.

≪ Third Embodiment >

A third embodiment of the present disclosure relates to a method for configuring scheduling information for 256QAM support. According to the third embodiment of the present invention, the size of the DCI defined in the existing LTE or LTE-A system, or the DCI format that does not support 256QAM is maintained, and resource block assignment Control information is defined differently from the DCI format which does not support 256QAM. According to this definition, the base station notifies the terminal of the modulation scheme of the data and the determination method of the TBS.

로 표현될 수 있다. N_RB ^DL는 하향링크 시스템 전송 대역을 구성하는 RB 개수이다. 상기 자원할당방법은 RB 단위로 연속적인 RB를 최대 N_RB ^DL개까지 하향링크 데이터 전송에 할당하는 방법이다. 표 13 은 LTE 혹은 LTE-A 시스템의 하향링크 시스템 전송 대역폭에 따라 정의된 N_RB ^DL 와 상기 자원할당방법에 따른 자원 블록 할당 제어정보의 비트수를 나타낸다. 표 13을 참조하면 10MHz 하향링크 시스템 전송대역폭의 경우 N_RB ^DL = 50 이고

= 11 비트이다.The number of bits of the resource block allocation control information constituting the DCI format of the DCI format which does not support 256QAM is determined by the number of bits =

. ≪ / RTI > N _RB ^DL is the number of RBs constituting the downlink system transmission band. The resource allocation method is a method of assigning consecutive RBs to downlink data transmission up to N _RB ^{DLs in} units of _RBs . Table 13 shows N _RB ^DL defined according to the downlink system transmission bandwidth of the LTE or LTE-A system and the number of bits of the resource block allocation control information according to the resource allocation method. Referring to Table 13, for a 10 MHz downlink system transmission bandwidth, N _RB ^DL = 50

= 11 bits.

Downlink system transmission bandwidth (MHz) N _RB ^DL

1.4 6 5 3 15 7 5 25 9 10 50 11 15 75 12 20 100 13

If the minimum allocation unit of the resource allocation method is defined as a unit of RBG (Resource Block Group) composed of a plurality of RBs, the size of resource block allocation control information required for notifying resource allocation can be reduced. Therefore, the BS can transmit the modulation scheme of the data and the determination method of the TBS without increasing the size of the entire DCI by utilizing the extra space by the amount of reduction of the resource block allocation control information.

Table 14 shows the number of _RBGs (N _RBG ^DL ) according to the downlink system transmission bandwidth when the RBG is configured with two RBs, the size of the resource block allocation control information required for allocating consecutive RBGs in RBG units, (X) of the resource block allocation control information.

Downlink system transmission bandwidth (MHz) RBG size (RB) N _RBG ^DL

X 1.4 2 3 3 2 3 2 8 6 One 5 2 13 7 2 10 2 25 9 2 15 2 38 10 2 20 2 50 11 2

Referring to Table 14, in case of 10 MHz downlink system transmission bandwidth, RBG consisting of two RBs is N _RBG ^DL = 25, the size of resource block allocation control information required for allocating RBGs consecutively in units of RBG is 9 bits, It can be seen that the resource block allocation control information is reduced by 2 bits with respect to the number of bits in Table 13. [ Therefore, the BS can transmit the modulation scheme of the data and the determination method of the TBS without increasing the size of the entire DCI by utilizing some or all of the 2 bits of the reduction amount of the resource block allocation control information.

For example, by utilizing 1 bit out of 2 bits of the reduction amount of the resource block allocation control information as the 'control information A' of the first embodiment described above, the BS determines the modulation scheme of the data to be transmitted to the UE and the determination method of the TBS Can be notified. That is, if the 'control information A' bit is '0', the UE determines a modulation scheme and a TBS according to a method defined in the existing LTE or LTE-A system or a scheme not supporting 256QAM. If the UE determines that the 'control information A' is '1', the UE determines that the existing modulation scheme is 256QAM, and the TBS determines the TBS determination method for the 256QAM described in the following fifth embodiment, It follows the other way you can.

As another example, if the 'control information A' = '1', the UE determines the modulation scheme and the TBS according to a method defined in the existing LTE or LTE-A system or a method not supporting 256QAM, If the control information A '=' 0 ', the UE determines that the modulation scheme is 256QAM, and the TBS is determined according to the TBS determination method for 256QAM described in the fifth embodiment, or a method capable of replacing it.

Table 15 shows the number of _RBGs (N _RBG ^DL ), the size of resource block allocation control information required to allocate consecutive RBGs in units of RBG, (Y) of the block allocation control information. Similarly to the above, the base station can notify the UE of the modulation scheme of the data and the determination method of the TBS without increasing the size of the entire DCI by utilizing a part or all of the decrease amount Y of the resource block allocation control information .

Downlink system transmission bandwidth (MHz) RBG size (RB) N _RBG ^DL

Y 1.4 2 3 3 2 3 2 8 6 One 5 2 13 7 2 10 3 17 8 3 15 4 19 8 4 20 4 25 9 4

The procedure by which the base station transmits the scheduling information to the mobile station according to the third embodiment is similar to the description of FIG. 2 of the first embodiment described above. In the first embodiment, the control information A is added to the DCI size in step 212 of FIG. 2, but the DCI size is changed. In the third embodiment, however, There are differences that remain the same as in the case.

The procedure for obtaining a scheduling information from a base station supporting 256QAM according to the third embodiment is similar to that of FIG. 3 of the first embodiment described above. However, in the case of the first embodiment, the DCI of the different size to which the control information 'A' is added is received in step 306 of FIG. 3. In the case of the third embodiment, the overall size of the received DCI is the same as that of the steps 302 and 304 There is a difference that is maintained.

<Fourth Embodiment>

A fourth embodiment of the present invention relates to a method for configuring scheduling information for 256QAM support. The size of the DCI defined according to the existing LTE or LTE-A system, or other methods that do not support 256QAM is maintained, and whether or not the modulation scheme in which the mapping position of the PDCCH for transmitting the DCI is applied to data transmission is 256QAM Indicate.

6 is a resource configuration diagram according to the fourth embodiment of the present invention.

6, if the index of the first CCE 606 of the PDCCH 604 including one or a plurality of control channel elements (CCEs) is an even number, the modulation scheme applied to the data transmission is Is determined by the MCS of the DCI of the method that does not support 256QAM (for example, the first DCI scheme), and if the index of the first CCE 606 of the PDCCH 604 is odd, the CCE index is odd The modulation scheme applied to the data transmission may be 256QAM. One CCE 602 is composed of a total of 36 REs by combining four REs 600. An aggregation level indicating how many CCEs constitute one PDCCH 604 is 1, 2, 4, or 8, respectively.

7 is a flowchart of a scheduling information transmission process according to the fourth embodiment of the present invention.

In step 700, the base station determines whether the terminal to which the service is provided supports 256QAM. The UE can inform the base station through signaling, for example, information indicating whether 256QAM is supported. If the UE does not support 256QAM, the process proceeds to step 702.

In step 702, it is determined whether the PDSCH is scheduled for the UE. If the base station determines PDSCH scheduling for the UE, the Node B configures a DCI for scheduling the PDSCH according to a method defined in the existing LTE or LTE-A system or a DCI configuration method not supporting 256QAM in step 704 do. In this case, the modulation scheme of the PDSCH can be determined to be one of QPSK, 16QAM, and 64QAM. In step 706, the base station generates and maps the PDCCH configured with the DCI according to a method that does not support the existing PDCCH mapping method or other 256QAM, and transmits the generated PDCCH to the UE.

If it is determined in step 700 that the UE supports 256QAM as a result of the determination in step 700, the process proceeds to step 708. In step 708, the base station determines whether to support 256QAM when transmitting the PDSCH to the UE, and notifies the UE of the indication information. Although the terminal supports 256QAM, the application of 256QAM may not be suitable depending on the channel status of the terminal, the location in the cell of the terminal, and the like. Therefore, the BS determines whether to schedule the PDSCH by applying 256QAM to the UE in consideration of the channel condition of the UE, the location of the UE in the cell, and so on, thereby determining the PDCCH mapping method. The base station informs the UE of the PDCCH mapping method determined in step 708 through explicit signaling or indirectly informs the UE of the PDCCH mapping method so that the UE does not receive any confusion in receiving and interpreting the PDCCH. However, this signaling indicates only the applicability of 256QAM, and whether to apply the 256QAM should be determined according to whether the CCE index of the PDCCH is even or odd.

If the base station determines to transmit the signal without applying 256QAM to the mobile station in step 708, the procedure moves to step 702 and the base station performs the corresponding procedure of step 702. [

If the base station determines to support the 256QAM scheduling in PDSCH transmission in step 708, the process moves to step 710. In step 710, the BS determines whether the PDSCH is scheduled for the UE. If the base station determines PDSCH scheduling for the UE, the Node B configures a DCI for scheduling the PDSCH in step 712. In this case, the modulation scheme of the PDSCH can be determined to be one of QPSK, 16QAM, 64QAM, and 256QAM, for example. In step 714, the BS transmits a PDCCH for scheduling the PDSCH to the MS according to the mapping method described above, according to whether the modulation scheme of the PDSCH to be transmitted is 256QAM. That is, if the modulation scheme of the PDSCH is not 256QAM, the base station maps the PDCCH so that the index of the first CCE of the PDCCH is even and transmits the mapping to the UE. If the modulation scheme of the PDSCH is 256QAM, the index of the first CCE of the PDCCH is odd PDCCH to the UE. In a modified method, if the modulation scheme of the PDSCH is not 256QAM, the base station maps the PDCCH to the UE so that the index of the first CCE of the PDCCH is an odd number, and if the modulation scheme of the PDSCH is 256QAM, the index of the first CCE of the PDCCH is Maps the PDCCH to an even number, and transmits the PDCCH to the UE.

8 is a flowchart of a scheduling information receiving process according to the fourth embodiment of the present invention. In step 800, the UE receives a notification through explicit signaling as to whether or not the 256QAM scheduling is supported by the base station, or is notified in an indirect manner. If the UE is notified from the base station that 256QAM scheduling is not supported, the process proceeds to 802. In step 802, the UE attempts to receive the PDCCH according to the existing mapping method. In step 804, when the UE receives the PDCCH, the UE determines a DCI for scheduling PDSCH according to a first method, for example, a method defined in an existing LTE or LTE-A system, or a method not supporting 256QAM. In this case, the modulation scheme of the PDSCH can be determined to be one of QPSK, 16QAM, and 64QAM.

If the UE receives a notification from the base station that it supports 256QAM scheduling in step 800, the process proceeds to step 806. In step 806, the UE attempts to receive the PDCCH according to the mapping method described above. When the UE receives the PDCCH, it determines the index of the first CCE of the PDCCH in step 808 and performs the DCI analysis method differently according to the CCE index. The determination of the position of the PDCCH may be performed according to a blind decoding scheme for a search space.

If the index of the first CCE of the PDCCH is an even number, the process moves to step 804, and the UE receives a DCI for scheduling PDSCH according to a method defined in the existing LTE or LTE-A system, or a method not supporting 256QAM . In this case, the modulation scheme of the PDSCH can be determined to be one of QPSK, 16QAM, and 64QAM.

If the index of the first CCE of the PDCCH is an odd number, the procedure moves to step 810 and the UE determines that the modulation scheme of the PDSCH is 256QAM, and the TBS is determined according to the TBS determination method for 256QAM described in the following fifth embodiment .

According to a modified example of the fourth embodiment, it can be indicated whether the modulation scheme of the PDSCH is 256QAM, depending on the aggregation level of the PDCCH. The higher the integration level, the more resources are used for the PDCCH and the coding rate of the PDCCH is lowered. Therefore, in general, when the channel environment is poor, a PDCCH of a high integration level is used to improve the reception error correction capability. In the case of 256QAM, it is generally applied to an environment having good channel condition. Therefore, it is expected that the level of PDCCH for scheduling PDSCH to which 256QAM is applied is relatively small.

For example, when the PDCCH has an integration level of 1 or 2, i.e., less than 4, the modulation scheme of the PDSCH scheduled by the PDCCH is 256QAM. If the integration level of the PDCCH is as large as 4 or 8, The base station can operate the modulation scheme of the PDSCH scheduled by the PDCCH to be QPSK, 16QAM, 64QAM instead of 256QAM. The BS can inform the UE of the modulation scheme of the PDSCH without adding additional control information. In this case, the CCE index is not utilized, and the application of 256QAM can be immediately determined depending on the integration level. If the integration level is 1 or 2, the UE can determine that 256QAM is applied to the PDSCH. Conversely, if the aggregation level is 4 or more, the terminal can analyze the received DCI and determine the modulation scheme accordingly.

<Fifth Embodiment>

A fifth embodiment of the present invention relates to a method for determining a TBS for supporting 256QAM by utilizing some or all of MCS control information and TBS defined in an existing LTE or LTE-A system.

The modulation schemes supported by existing LTE or LTE-A systems are QPSK, 16QAM, and 64QAM, respectively, corresponding to modulation order (Q _m ) = 2, 4, and 6, respectively. That is, according to the QPSK scheme, 2 bits can be transmitted per modulation symbol, 4 bits per modulation symbol according to the 16QAM scheme, and 6 bits per modulation symbol according to 64QAM. The modulation order of 256QAM is 8, and according to 256QAM, 8 bits can be transmitted per modulation symbol.

The TBS for supporting 256QAM can be determined from the TBS for the modulation schemes of Tables 1 and 2 to Table 12 in consideration of the relative difference of the modulation order of each modulation scheme. For example, according to the methods of Tables 1 and 2 to 12, when the base station notifies "10" as MCS control information (I _MCS = 10) and notifies N _PRB = 10 through the resource block allocation control information, According to Table 1, the modulation scheme is 16QAM, the TBS index (I _TBS ) is 9, and TBS is calculated as 1544 according to Table 2. For convenience of explanation, the modulation scheme and TBS calculated from the MCS control information by the scheme of Table 1, Table 2 to Table 12 (or other scheme not supporting 256QAM) are referred to as reference modulation scheme and reference TBS do.

It is assumed that the base station informs that the modulation scheme of the PDSCH is 256QAM through a separate method. If the base station notifies "10" as MCS control information (I _MCS = 10) and notifies N _PRB = 10 through the resource block allocation control information, then the TBS to which 256QAM is applied is a relative value of 256QAM and 16QAM as the reference modulation scheme (= 1544 x 2) reflecting the modulation order ratio '2' (= 8/4). That is, since 256QAM has relatively higher transmission efficiency than the reference modulation scheme of the modulation order lower than 256QAM, it can support a relatively large TBS than the reference TBS.

9 is a schematic diagram of a TBS acquisition process according to the fifth embodiment of the present invention.

When the above operation is generalized, a TBS corresponding to 256QAM is determined from the reference modulation scheme provided from the MCS control information and the reference TBS as shown in FIG. Specifically, it is as follows.

The reference modulation scheme = QPSK, the modulation order ratio 4 (= 8/2) relative to the reference modulation scheme QPSK and 256QAM is determined (= TBS corresponding to 256QAM) = (reference TBS) x 4.

(Reference TBS) x 2 (= TBS corresponding to 256QAM), reflecting the modulation order ratio 2 (= 8/4) relative to the reference modulation scheme 16QAM and 256QAM if the reference modulation scheme = 16QAM.

(Reference TBS) x (4/3 (= 8/6)) corresponding to the modulation order ratio 4/3 (= 8/6) relative to the reference modulation scheme 64QAM and 256QAM if the reference modulation scheme = 64QAM ).

If the TBS to which the 256QAM calculated as described above is not an integer that is a multiple of 8, the base station and / or the UE adjusts the determined value so that the TBS becomes a multiple of 8 bits which is the basic unit. That is, ceiling (TBS with 256QAM, 8) is determined as the final TBS value. In this case, ceiling (a, b) is an integer that is a multiple of b and an integer that is smaller than or equal to a.

The method may be modified in a number of different ways. According to one variant, the base station and / or the terminal may make further adjustments so that the magnitude of the adjusted TBS value is the same as the inner interleaver size of the turbo code applied to the PDSCH to facilitate terminal processing.

According to another modified method of the above method, when the base station applies scheduling using 256QAM as a modulation method of the PDSCH, the MCS control information of the PDCCH for scheduling the PDSCH does not support the existing LTE and LTE-A systems or other 256QAM It is possible to reduce the terminal processing complexity by limiting the MCS control information to indicate only some of the modulation schemes and the TBS, instead of indicating all the modulation schemes and TBSs defined in the method. For example, if the reference modulation scheme indicated by the MCS control information of the corresponding PDCCH is QPSK and the reference TBS indicated by the corresponding MCS control information is a TBS corresponding to the reference modulation scheme QPSK, for a PDCCH scheduling PDSCH to which 256QAM is applied, The MCS control information of the PDCCH can be configured. The terminal and / or the base station can obtain a TBS corresponding to 256QAM using the reference modulation scheme and the reference TBS.

According to another modified method of the above method, a separate table is defined by applying the calculation method described in the fifth embodiment to the TBSs of Tables 2 to 12 or otherwise, The base station can be utilized as a TBS for 256QAM.

10 is a flowchart of a TBS acquisition process according to the fifth embodiment of the present invention. In step 1000, the UE determines whether a DCI configuration method supporting 256QAM is used. The UE may be informed of the availability of 256QAM scheduling, for example, through the explicit signaling from the base station, or may be notified in an indirect manner.

If the UE receives a notification from the base station that 256QAM scheduling is not supported, the process proceeds to step 1002. In step 1002, the UE attempts to receive the PDCCH. When the UE receives the PDCCH, it determines a TBS for scheduling PDSCH according to a method defined in the existing LTE or LTE-A system or a method not supporting 256QAM in step 1004. In this case, the modulation scheme of the PDSCH can be determined to be one of QPSK, 16QAM, and 64QAM.

If the mobile station receives a notification from the base station that it supports 256QAM scheduling in step 1000, the process proceeds to step 1006. In step 1006, the UE attempts to receive the PDCCH. When the UE receives the PDCCH, the UE proceeds to step 1008. [ In step 1008, the UE determines whether the PDCCH is applied to the 256QAM PDCCH scheduled by the PDCCH. If 256QAM is not applied, the procedure moves to step 1004 and the UE determines the TBS of the PDSCH according to a method defined in a method that does not support the existing LTE or LTE-A system or other 256QAM.

If the modulation scheme of 256QAM is applied to the PDSCH scheduled by the PDCCH, the procedure moves to step 1010, and the UE determines the TBS of the PDSCH considering the reference modulation scheme and the reference TBS obtained from the PDCCH.

<Sixth Embodiment>

In the sixth embodiment of the present invention, the size of the existing DCI is maintained, and the MCS control information constituting the DCI is divided into 'control information B' indicating the modulation method and 'control information C' indicating the TBS And how to determine a TBS for 256QAM support when configured and operating.

For example, the 'control information B' is composed of 2 bits, and according to the bit setting, it indicates QPSK if it is 00, 16QAM if it is 01, 64QAM if it is 10 and 256QAM if it is 11 I suppose. The 'control information C' is composed of 3 bits and indicates a specific TBS according to the bit setting.

However, referring to Tables 2 to 12, the TBS index (I _TBS ) is composed of a total of 27 indices ranging from 0 to 26. Therefore, not all TBS indexes can be expressed by the 3-bit control information C '. Therefore, similar to the fifth embodiment, it may be considered to define the reference TBS and determine the TBS by reflecting the modulation order according to the modulation scheme of the PDSCH scheduled by the PDCCH.

Referring to Table 1, QPSK corresponds to 10 TBS index (I _TBS ) from 0 to 9, 16QAM corresponds to 7 TBS index from 9 to 15, 64QAM corresponds to 12 TBS index from 15 to 26 do. Therefore, a reference TBS including TBS calculated from 7 TBS indexes from 9 to 15 in Tables 2 to 12 is defined, and a modulation scheme corresponding to the reference TBS is defined as a reference modulation scheme from Table 1, The final TBS can be determined from the relative modulation order ratio of the modulation scheme indicated by the control information B 'and the reference modulation scheme and the reference TBS calculated by the control information C'. For the above operation, an exemplary one-to-one correspondence between the 'control information C' and the TBS indexes 9 to 15 corresponding to the 16QAM of Table 1 may be defined as shown in Table 16. Then, the terminal and / or the base station determines the reference TBS from the existing TBS determination method from the TBS index determined from the 'control information C' and the number of RBs calculated from the resource block allocation control information (N _PRB ).

'Control information C' TBS Index
I _TBS 0 9 One 10 2 11 3 12 4 13 5 14 6 15 7 -

For example, when the base station notifies 'control information C' = '1' and notifies N _PRB = 10 through the resource block allocation control information included in the DCI, I _TBS = 10 according to Table 16, The reference TBS is set at 1736 according to Tables 2 to 12. When the base station notifies 256QAM by the 'control information B', the TBS to which 256QAM is applied compares the modulation order ratio 2 (= 8/4) relative to 16QAM and 256QAM, which are reference modulation methods corresponding to the reference TBS, To be 3464 (= 1732 x 2).

Specifically, it is as follows

- Reflecting the modulation order ratio 1/2 (= 2/4) relative to the reference modulation method 16QAM and QPSK if the modulation scheme notified by control information B is QPSK = (TBS with QPSK applied) = ) / 2.

- (TBS with 16QAM applied) = (reference TBS) reflecting the modulation order ratio 1 (= 4/4) relative to the reference modulation scheme 16QAM and 16QAM if the modulation scheme notified by control information B is 16QAM. .

- If the modulation scheme notified by the control information B is 64QAM, the modulation order ratio 3/2 (= 6/4) relative to the reference modulation scheme 16QAM and 64QAM is reflected (TBS with 64QAM applied) = TBS) x (3/2).

(TBS with 256QAM applied) = (reference TBS) reflecting the modulation order ratio 2 (= 8/4) relative to the reference modulation scheme 16QAM and 256QAM if the modulation scheme notified by control information B is 256QAM. x 2.

11 is a flowchart of a TBS acquisition procedure according to the sixth embodiment of the present invention. 11 will not be described in detail. For example, steps 1100, 1102, 1104, and 1106 of FIG. 11 correspond to steps 1000, 1002, 1004, and 1006 of FIG.

Referring to FIG. 11, in step 1108, the UE determines a modulation scheme and a TBS index of the PDSCH scheduled by the PDCCH from the 'control information B' and the 'control information C'. The base TBS is determined using the TBS index and the number of RBs (N _PRB ) calculated from the resource block allocation control information, and the final TBS is calculated by applying the modulation order ratio relative to the reference modulation scheme to the reference TBS.

The base station can transmit PDCCH and PDSCH according to the promised method so that the UE can acquire information on the modulation scheme and the TBS in the manner of FIG. 10 and / or FIG.

12 is a block diagram of a base station according to at least some embodiments of the present disclosure. 12, the base station includes a PDCCH generation unit 1230, a PDSCH generation unit 1240, a multiplexer 1250, and a transmission RF block 1260. PDCCH generation unit 1230, PDSCH generation unit 1240, multiplexer 1250, and transmission RF block 1260 are collectively referred to as a transmission unit. The constituent unit that receives a signal for operation of the base station is called a receiving unit. The transmitting unit and the receiving unit are collectively referred to as a communication unit.

The base station may further include a scheduler 1220 and a controller 1210. The controller 1210 determines whether the terminal supports 256QAM, determines a DCI configuration method according to the 256QAM, and controls the scheduler 1220. The scheduler 1220 performs scheduling for the PDSCH according to the control of the controller 1210 and configures the scheduling information according to one or more of the above embodiments and outputs the scheduling information to the PDSCH generator 1240 and the PDCCH generator 1230, . The PDCCH generator 1230 generates a PDCCH by performing processes such as channel coding and modulation on downlink control information including scheduling information under the control of the scheduler 1220. The PDSCH generator 1240 generates a PDSCH by performing processes such as channel coding and modulation on the downlink data under the control of the scheduler 1220. The PDCCH and the PDSCH generated by the PDCCH generator 1230 and the PDSCH generator 1220 are multiplexed by the multiplexer 1250 and then processed by the transmission RF block 1260, Lt; / RTI &gt;

13 is a block diagram of a terminal according to at least some embodiments of the present disclosure. 13, the UE may include a PDCCH receiver 1330, a PDSCH receiver 1340, a demultiplexer 1350, a receive RF block 1360, and a controller 1310. PDCCH receiver 1330, PDSCH receiver 1340, demultiplexer 1350 and reception RF block 1360 are collectively referred to as a receiver. The configuration unit that transmits a signal necessary for the operation of the terminal is referred to as a transmission unit. The transmitting unit and the receiving unit are collectively referred to as a communication unit.

The controller 1310 acquires the DCI from the PDCCH received by the PDCCH receiver 1330 and controls the operation of the PDSCH receiver 1340 in consideration of whether or not the terminal supports 256QAM and 256QAM support of the base station. The PDCCH receiver 1330 performs processes such as demodulation and channel decoding on the PDCCH received by the UE to acquire the DCI. The PDSCH receiving unit 1340 performs processes such as demodulation and channel decoding on the PDSCH received by the UE to acquire downlink data. The specific DCI decision method and the TBS of the PDSCH may be processed / obtained according to at least some of the embodiments described above.

It should be understood, however, that the embodiments herein disclosed and illustrated herein are illustrative of specific examples and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variants based on the technical idea of the present invention are feasible.

Claims (8)

In a control signal transmission method of a base station,
Generating downlink control information (DCI) including indication information indicating whether to transmit a signal to which a 256QAM (Quadrature Amplitude Modulation) is applied to the UE; And
And transmitting a Physical Downlink Control Channel (PDCCH) including the DCI. The method according to claim 1,
Generating the DCI includes generating a DCI including modulation scheme indication information of 2 bits in size and transport block size (TBS) information of 3 bits in size. The method according to claim 1,
Wherein generating the DCI comprises:
Determining a Transport Block Size (TBS) to be applied to a signal transmitted to the UE;
Determining a reference TBS using the ratio information between the modulation order of the TBS and the modulation order of the preset reference modulation scheme and the modulation order of the 256QAM;
And transmitting a DCI including indication information indicating transmission of a signal to which the 256QAM is applied and TBS indication information indicating the reference TBS to the UE. In a control signal transmission method of a base station,
Generating downlink control information (DCI) to be applied to a mobile station; And
And transmitting the DCI in a Physical Downlink Control Channel (PDCCH) having a CCE (Conrol Channel Element) having an even index as a start CCE when determining to transmit a signal to which the 256QAM (Quadrature Amplitude Modulation) is applied to the UE The base station transmits the control signal to the base station. A method for receiving a control signal of a terminal,
Receiving a Physical Downlink Control Channel (PDCCH) including downlink control information (DCI) from a base station; And
And acquiring indication information indicating whether to transmit a signal to which 256QAM (Quadrature Amplitude Modulation) is applied from the DCI. 6. The method of claim 5,
The step of acquiring indication information indicating whether to transmit a signal to which the 256QAM is applied from the DCI,
And obtaining modulation scheme indication information of 2 bits in size and transport block size (TBS) information of 3 bits in size from the DCI. 6. The method of claim 5,
The step of acquiring indication information indicating whether to transmit a signal to which the 256QAM is applied from the DCI,
Acquiring indication information indicating transmission of a signal to which the 256QAM is applied and TBS indication information indicating a reference transport block size (TBS) from the DCI;
Determining a TBS using the ratio information between the reference TBS corresponding to the TBS indication information and a modulation order of a predetermined reference modulation scheme and a modulation order of 256QAM. A method for receiving a control signal of a terminal,
Receiving a Physical Downlink Control Channel (PDCCH) from a base station; And
And determining that a signal to which 256QAM (Quadrature Amplitude Modulation) is applied is transmitted to the UE when the CCE index of the start CCE of the PDCCH is an even number.

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