KR20190000772A - Method and apparatus for wireless communication using modulation and coding schemes and transport block sizes - Google Patents

Abstract

A method of processing a signal received over a wireless link in accordance with an exemplary embodiment of the present disclosure includes obtaining at least one parameter including sub-carrier spacing (SCS) Detecting a modulation order and a transmission block size, and processing the received signal based on the detected modulation order and transmission block size.

Description

Field of the Invention [0001] The present invention relates to a method and apparatus for wireless communication using modulation and coding schemes and transmission block sizes,

Technical aspects of the present disclosure relate to wireless communication, and more particularly, to wireless communication methods and apparatus using modulation and coding schemes and transport block sizes.

A wireless communication system supports a flexible communication configuration to increase data throughput adaptively to changes in a communication environment. The transmitting side and the receiving side can commonly recognize the specific communication setting among the plurality of communication settings and can communicate with each other according to the recognized communication setting. The overhead required for sharing of communication settings may arise, and as the wireless communication system evolves, more and more communication settings are defined, the overhead required for sharing the communication settings may increase. Accordingly, while reducing the overhead required for sharing the communication settings, while the wireless communication system supports various communication settings, it may be important to increase the efficiency of the wireless communication system.

The technical idea of the present disclosure provides a method and apparatus for wireless communication that efficiently shares various communication settings in a wireless communication system.

According to an aspect of the technical aspects of the present disclosure, a method for processing a signal received over a wireless link includes at least one parameter including sub-carrier spacing (SCS) Detecting a modulation order and a transport block size based on the at least one parameter, and processing the received signal based on the detected modulation order and transport block size .

According to an aspect of the present disclosure, a method for processing a signal received via a wireless link includes obtaining DCI (Downlink Control Information), receiving at least one of a modulation order, a physical resource block number, and a transport block size from the DCI Identifying at least one value of at least one of an modulation order, a physical resource block count and a transport block size based on the value of the extracted at least one field, And processing the received signal based on the value of the received signal.

According to an aspect of the present disclosure, a method for processing a signal received over a wireless link includes obtaining an adjustment indicator indicating a change in at least one of a modulation order and a transport block size (TBS) index Updating the modulation order and the TBS index by changing at least one value in response to the adjustment indication, and processing the received signal based on the updated modulation order and the updated TBS index. have.

A wireless communication device in accordance with an aspect of the teachings of the present disclosure may include a processor and a memory for storing a plurality of instructions accessed by the processor and executed by the processor to perform the wireless communication method.

According to the apparatus and method for wireless communication according to the exemplary embodiment of the present disclosure, optimal communication settings can be efficiently shared between the transmitting side and the receiving side.

Further, according to the apparatus and method for wireless communication according to the exemplary embodiment of the present disclosure, improved communication efficiency can be achieved due to optimal communication settings.

1 is a block diagram of a wireless communication system including a base station and user equipment in accordance with an exemplary embodiment of the present disclosure.
2 is a block diagram illustrating an example of a TTI transmitted on the downlink of FIG. 1 in accordance with an exemplary embodiment of the present disclosure;
Figures 3A and 3B illustrate examples of tables used to share a transmission format (TF) in an LTE system.
4 is a flow chart illustrating a wireless communication method in accordance with an exemplary embodiment of the present disclosure;
Figure 5 is a flow chart illustrating an example of step S140 of Figure 4 in accordance with an exemplary embodiment of the present disclosure.
Figure 6 is a diagram illustrating an example of a table (T50) of Figure 5 in accordance with an exemplary embodiment of the present disclosure.
Figures 7A-7C are diagrams illustrating examples of table T50 of Figure 5 in accordance with exemplary embodiments of the present disclosure.
Figure 8 is a flow chart illustrating an example of step S140 of Figure 4 in accordance with an exemplary embodiment of the present disclosure.
9 is a flow diagram illustrating a wireless communication method in accordance with an exemplary embodiment of the present disclosure.
10 is a diagram illustrating downlink control information (DCI) according to an exemplary embodiment of the present disclosure.
11 is a flow diagram illustrating a wireless communication method in accordance with an exemplary embodiment of the present disclosure;
12 is a diagram illustrating downlink control information (DCI) according to an exemplary embodiment of the present disclosure.
13 shows an exemplary block diagram of a wireless communication device in accordance with an exemplary embodiment of the present disclosure;

1 is a block diagram of a wireless communication system 10 including a base station 100 and a user equipment 200 in accordance with an exemplary embodiment of the present disclosure. The wireless communication system 10 includes, but is not limited to, a 5G (5th generation) wireless system, an LTE (Long Term Evolution) system, an LTE-Advanced system, a Code Division Multiple Access (CDMA) system, a Global System for Mobile Communications ) System, a Wireless Local Area Network (WLAN) system, or any other wireless communication system. In the following, it will be appreciated that the wireless communication system 10 is described primarily with reference to a 5G system and / or an LTE system, but the exemplary embodiments of the present disclosure are not so limited.

A base station (BS) 100 may generally refer to a fixed station that communicates with a user equipment and / or other base station and may communicate with a user equipment and / Can be exchanged. For example, the base station 100 may include a Node B, an evolved Node B (eNB), a sector, a Site, a Base Transceiver System (BTS), an Access Pint (AP), a Relay Node, A remote radio head (RRH), a radio unit (RU), a small cell, or the like. In the present specification, the base station 100 or cell has a comprehensive meaning indicating some areas or functions covered by BSC (Base Station Controller) in CDMA, Node-B in WCDMA, eNB or sector (site) in LTE And can cover various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, small cell communication range, and the like.

A user equipment (UE) 200 is a wireless communication device, which may refer to various devices that may be fixed or mobile and may communicate with the base station 100 to transmit and receive data and / or control information . For example, the user equipment 200 may be a terminal equipment, a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a handheld device, or the like.

A wireless communication network between user equipment 200 and base station 100 may support communication of multiple users by sharing available network resources. For example, in a wireless communication network, a code division multiple access (CDMA), a frequency division multiple access (FDMA), a time division multiple access (TDMA), an orthogonal frequency division multiple access (OFDMA) Access), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA, and the like.

1, the user equipment 200 and the base station 100 can communicate with each other through an uplink (UL) 12 and a downlink (DL) 14. In a wireless system such as an LTE system and an LTE-Advanced system, the uplink 12 and the downlink 14 are connected to each other through a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator Channel (PCFICH), a Physical Hybrid ARQ Indicator Channel ), A Physical Uplink Control Channel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH), and the like, and can transmit control information such as PDSCH (Physical Downlink Shared Channel), PUSCH Data can be transmitted through the channel. Also, control information may be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, signals transmitted / received through channels such as PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH can be expressed in the form of " PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received ". In addition, transmitting or receiving a PDCCH or transmitting or receiving a signal via a PDCCH may include transmitting or receiving an EPDCCH or transmitting or receiving a signal via an EPDCCH. That is, the physical downlink control channel may be a PDCCH or an EPDCCH and may include both PDCCH and EPDCCH.

Referring to FIG. 1, a base station 100 may include a signal processor 120, a transceiver 140, and an antenna 160. In some embodiments, the transceiver 140 may include a filter, a mixer, a power amplifier (PA), and a low noise amplifier (LNA). The transceiver 140 may transmit signals through the antenna 160 and the downlink 14. For example, the transceiver 140 may shift a signal provided from the signal processor 120, for example, from a baseband to a radio frequency (RF) band through a mixer, and transmit the shifted signal, And provide the amplified signal to the antenna 160. The transceiver 140 may also process signals received via the uplink 12 and the antenna 160 and may provide processed signals to the signal processor 120. For example, the transceiver 140 may amplify the signal received via the antenna 160, e.g., via a low noise amplifier, and may shift the amplified signal from the RF band to the baseband, e.g., via a mixer, And provide the shifted signal to the signal processor 120.

The signal processor 120 may include a Medium Access Control (MAC) block 122, a PHY (physical) block 124, and a scheduler 126. The MAC block 122 and the PHY block 124 may perform operations corresponding to the MAC layer and the PHY layer (or physical layer) of the wireless communication system 10, respectively. For example, the MAC block 122 may perform logical-channel multiplexing, Hybrid Automatic Repeat and Request (HARQ) retransmissions, scheduling of the uplink 12 and downlink 14, and Carrier Aggregation (CA) Can be performed. The PHY block 124 may also receive a transport block from the MAC block 122 for the downlink 14 and may perform cyclic redundancy correction (CRC) insertion, encoding, rate matching, , Scrambling, modulation, and antenna mapping, and so on. Although shown as separate in FIG. 1, in some embodiments, MAC block 122 and PHY block 124 may be implemented as a unit.

The scheduler 126 may control the MAC block 122 and the PHY block 124. The scheduler 126 performs communication for communication with the user equipment 200 based on the states of the uplink 12 and the downlink 14, the states of the links with the user equipment 200 and other user equipments, The setting can be determined. For example, the scheduler 126 may determine a transport format (TF) for a transport block, and the transport format may include a Transport Block Size (TBS), a Modulation and Coding Scheme MCS), antenna mapping, and the like. The scheduler 126 may control the MAC block 122 according to the determined transport block size (TBS) TBS and may determine the PHY (Physical Layer) based on the Modulation and Coding Scheme (MCS) and Transmission Format Block 124 may be controlled. For example, the wireless communication system 10 may define quadrature phase-shift keying (QPSK) (or 4QAM), 16QAM, 64QAM, 256QAM and 1024QAM as modulation schemes, order (MO). In addition, the wireless communication system 10 may define 16 to 105528, or more, as transport block sizes (TBS) indicating the size of information bits that can be transmitted.

In some embodiments, the transmission format (TF) may include sub-carrier spacing (SCS), and the scheduler 126 may select a sub-carrier spacing (SCS) 124). For example, the wireless communication system 10 may define 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz as the subcarrier spacing (SCS), the subcarrier spacing (SCS) Modulation scheme.

In some embodiments, the transmission format TF may include a number of symbols per Transmission Time Interval (TTI) and the scheduler 126 may determine the number of symbols per TTI of the determined transmission format (TF) Can be controlled. For example, the wireless communication system 10 may define 1 to 14 as the number of symbols N_SYM per slot, the number of symbols per slot N_SYM may be related to the transport block size (TBS) .

In some embodiments, the transmission format TF may include the maximum bandwidth per element carrier (CC) and the scheduler 126 may determine the maximum bandwidth per component carrier (CC) of the determined transmission format (TF) It is possible to control the control unit 124. For example, the wireless communication system 10 may define 100 MHz, 400 MHz as the maximum bandwidths according to the element carrier (CC), and the maximum bandwidth may be associated with the transport block size (TBS), modulation scheme.

In some embodiments, the transmission format TF may include a number of subcarriers per physical resource block (PRB), and the scheduler 126 may determine the number of subcarriers per physical resource block (PRB) The PHY block 124 can be controlled according to the number of subcarriers. For example, the wireless communication system 10 may define values before and after 12 as the number of subcarriers per a plurality of physical resource blocks (PRBs), the number of subcarriers per physical resource block (PRB) may be a transport block size (TBS) Modulation scheme.

The scheduler 126 may transmit at least one parameter according to the determined transmission format TF to the user equipment 200 via the downlink 14. [ The user equipment 200 can detect the transmission format (TF) of the signal (for example, the signal of the SCH region) that the base station 100 transmits via the downlink 14 based on the received at least one parameter, And can process the received signal according to the detected transmission format (TF). The parameters include the communication settings included in the transmission format (TF), such as the modulation order (MO), the transport block size (TBS), the number of symbols per TTI, the maximum bandwidth per element carrier (CC), the number of subcarriers per physical resource block Or may have a value that indirectly indicates the transmission format (TF), that is, a value that can derive the transmission format (TF). At least one parameter according to the transmission format TF may be provided to the user equipment 200 via downlink control information (DCI) of the PHY layer in some embodiments, and in some embodiments, May be provided to the user equipment 200 through an upper layer, e.g., MAC or Radio Resource Control (RRC) signaling.

1, the user equipment 200 may include a signal processor 220, a transceiver 240, and an antenna 260. The transceiver 240 may receive signals through the downlink 14 and the antenna 260 and may transmit signals through the antenna 260 and the uplink 12.

Similar to base station 100, signal processor 220 of user equipment 200 may include a MAC block 222 and a PHY block 224, and MAC block 222 and PHY block 224 may include a radio And perform operations corresponding to the MAC layer and the PHY layer of the communication system 10, respectively. For example, the PHY block 224 may perform antenna demapping, demodulation, descrambling, decoding, CRC checking, etc. for the downlink 14. Although shown as separate in FIG. 1, in some embodiments the MAC block 222 and the PHY block 224 may be implemented as a unit.

The controller 226 may obtain at least one parameter according to the transmission format TF determined by the scheduler 126 of the base station 100 and may detect the transmission format TF from the acquired parameters. The controller 226 may control the PHY block 224 according to the modulation and coding scheme (MCS) of the detected transmission format TF and the PHY block 224 may process the signal under control of the controller 226 For example, demodulation). The controller 226 may control the MAC block 222 according to the transport block size TBS of the detected transmission format TF and the MAC block 222 may process the signal under the control of the controller 226 can do.

As described below, in accordance with the illustrative embodiments of the present disclosure, the base station 100 and the user equipment 200 may efficiently share the transmission format (TF) in various manners. Accordingly, the efficiency of the wireless communication system 10 can be increased by adaptively utilizing the optimal transmission format (TF), i.e., optimal communication settings.

2 is a block diagram illustrating an example of a TTI transmitted over the downlink 14 of FIG. 1 in accordance with an exemplary embodiment of the present disclosure. Data may be transmitted on a TTI basis in the wireless communication system 10 through the downlink 14 and one TTI may be defined as a time interval including a plurality of symbols (e.g., OFDM symbols). For example, in a LTE system, a TTI may be a sub-frame having a length of 1 ms, and in a 5G system, a TTI may be a scalable TTI. Hereinafter, Fig. 2 will be described with reference to Fig.

2, the TTI 5 includes a control region for transmission of two time regions multiplexed by Time Division Multiplexing (TDM), i.e., a control channel (e.g., PDCCH, PHICH, etc.) And a data area for transmission of a channel (e.g., PDSCH, etc.). For example, the control region may comprise a plurality of symbols for the control channel, while the data region may comprise the remaining symbols for the shared channel.

The control region may include information about the downlink 14. For example, in the LTE system, the control region includes a physical downlink control channel (PDCCH) including a location of a PDSCH and downlink control information (DCI), a number of OFDM symbols (i.e., (Physical Hybrid-ARQ Indicator Channel) including a response signal for an ACK (Acknowledgment) / NACN (Negative-Acknowledgment) signal and a Physical Control Format Indicator Channel (PCFICH) . ≪ / RTI > The downlink control information DCI transmitted through the PDSCH may include uplink resource allocation information, downlink resource allocation information, and the like, and parameters for sharing a transmission format (TF) as described above with reference to FIG. . ≪ / RTI >

Figures 3A and 3B illustrate examples of tables used to share a transmission format (TF) in an LTE system. Specifically, FIG. 3A shows a part of the MCS table (T_MCS), and FIG. 3B shows a part of the TBS table (T_TBS). Hereinafter, Figs. 3A and 3B will be described with reference to Fig.

The scheduler 126 may determine one of a plurality of modulation schemes for the downlink 14 based on the channel conditions of the downlink 14. For example, the scheduler 126 can increase the bandwidth efficiency by adopting a higher modulation order (Mo) when the channel state of the downlink 14 is good, while the scheduler 126 can improve the efficiency of the downlink 14 when the channel state of the downlink 14 is good , A robust transmission can be maintained by adopting a low modulation order (Mo) to overcome channel conditions. Thus, the method of adjusting the MCS according to the channel state can be referred to as link adaptation, and the link adaptation can be applied to improve the transmission rate of the radio system adaptively to the state of the radio channel varying with time Can be realized by adjusting the MCS.

3A, an MCS table (T_MCS) may include MCS indexes (I_MCS) of 0 to 31, and MCS indexes (I_MCS) of 0 to 28 of the MCS table (T_MCS) may be used for HARQ initial transmission , And the MCS indexes (I_MCS) of 29 to 31 may be used for HARQ retransmission. Each of the MCS indexes (I_MCS) may correspond to one of three different modulation schemes. That is, as shown in FIG. 3A, the MCS indexes (I_MCS) of 0 to 4 may correspond to QPSK, the MCS indexes (I_MCS) of 5 to 10 may correspond to 16QAM, May correspond to 64QAM, and the MCS indexes (I_MCS) of 20 to 27 may correspond to 256QAM. In this manner, there can be a plurality of MCS indexes I_MCS corresponding to the same modulation scheme, and each of the MCS indexes I_MCS corresponding to the same modulation scheme may have code of different code rate to be used . In addition, the MCS indexes (I_MCS) of 28 to 31 of the MCS table (T_MCS) can be used to distinguish the modulation scheme used for HARQ retransmission, and QPSK, 16QAM and 64QAM and 256QAM, Respectively. ≪ / RTI > As a result, the MCS table (T_MCS) can support up to 256QAM. In addition, as shown in FIG. 3A, the MCS table T_MCS may include TBS indexes I_TBS corresponding to MCS indexes I_MCS. The TBS index (I_TBS) can be used to detect the transport block size (TBS) as described below with reference to FIG. 3B.

The use of the MCS table (T_MCS) of FIG. 3A may be restricted if the modulation scheme specified in the wireless communication system 10 varies or the parameters underlying the modulation scheme change. For example, the use of the MCS table (T_MCS) of FIG. 3A may be restricted if an additional modulation order (MO) such as 1024QAM and an adjustable subcarrier interval (SCS) are added depending on the 5G system. Also, due to the limited MCS table (T_MCS), it may not be easy to set an optimal modulation and coding scheme (MCS) in consideration of the parameters.

Referring to FIG. 3B, the TBS table T_TBS may include transport block sizes (TBS) corresponding to pairs of a TBS index (I_TBS) and a physical resource block number (N_PRB). In the LTE system, since the size of a transmission resource can be allocated to the user equipment 200 from one physical resource block (PRB) to 110 physical resource blocks (PRB), 110 transmissions are transmitted for each TBS index (I_TBS) 3B shows a block diagram of a transport block size (TBS) according to TBS indexes (I_TBS) of 0 to 10 and physical resource block numbers of 1 to 10 as part of a TBS table (T_TBS) ).

When the number of physical resource blocks (N_PRB) defined in the radio communication system 10 fluctuates, the use of the TBS table (T_TBS) of FIG. 3B may be restricted. For example, if the number of physical resource blocks (N_PRB) (e.g., 275) larger than 110 according to the 5G system is defined, the use of the TBS table (T_TBS) of FIG. 3B may be restricted. In addition, due to the limited TBS table (T_TBS), it may not be easy to set the optimal transport block size (TBS) in consideration of the parameters.

4 is a flow chart illustrating a wireless communication method in accordance with an exemplary embodiment of the present disclosure; For example, the method S100 of FIG. 4 may be performed by the signal processor 220 for processing of signals received via the downlink 14 of FIG. As shown in FIG. 4, the method SlOO of FIG. 4 may include a plurality of steps S120, S140, S160, hereinafter, FIG. 4 will be described with reference to FIG.

In step S120, an operation of acquiring at least one parameter may be performed. At least one parameter is communicated to the user device 200 to share the transmission format (TF) determined by the scheduler 126 of the base station 100 with the user device 200, as described above with reference to FIG. And the controller 226 may obtain at least one parameter provided from the base station 100. At least one parameter may be provided to the user equipment 200 via the downlink control information (DCI) of the PHY layer in some embodiments and may be provided to the user equipment 200 via an upper layer, e.g., MAC or RRC signaling May be provided.

In some embodiments, the at least one parameter may comprise a subcarrier interval (SCS). 1, the wireless communication system 10 may define a plurality of subcarrier intervals (SCSs) and the base station 100 may transmit a parameter indicative of one subcarrier interval (SCS) to the user device 200 ). The controller 226 may obtain the subcarrier interval SCS and may detect the modulation and coding scheme (MCS) and the transport block size (TBS) based on the subcarrier interval SCS in subsequent steps.

In step S140, an operation of detecting the modulation order MO and the transport block size TBS may be performed. For example, the controller 226 may detect the modulation order (MO) and the transport block size (TBS) based on the at least one parameter obtained in step S120. The examples of step S140 will be described later with reference to Figs.

In step S160, an operation of processing the received signal may be performed. For example, the controller 226 may control the PHY block 224 and the MAC block 222 based on the modulation order (MO) and the transport block size (TBS) detected in step S140, and the PHY block 224 And the MAC block 222 may process signals provided from the transceiver 240 under the control of the controller 226. [ For example, the PHY block 224 may demodulate the signal based on the detected modulation order (MO), and the MAC block 222 may demodulate the signal based on the detected transport block size (TBS) Can be generated.

Figure 5 is a flow chart illustrating an example of step S140 of Figure 4 in accordance with an exemplary embodiment of the present disclosure. As described above with reference to FIG. 4, the operation of detecting the modulation order MO and the transport block size TBS in step S140 'of FIG. 5 may be performed, and as shown in FIG. 5, May include steps S141 and S142. In some embodiments, step S140 'of FIG. 5 may be performed by the controller 226 of FIG. 1, and hereinafter, FIG. 5 will be described with reference to FIG.

In step S141, an operation referring to at least one table can be performed. For example, the controller 226 may refer to the table T50 by accessing the memory storing the table T50. The table T50 may be defined by the wireless communication system 10 and the base station 100 and the user equipment 200 may store the table T50 in common. As described later with reference to FIG. 6 and the like, the table T50 may include information corresponding to the parameters. The controller 226 may refer to one table in some embodiments, or to a plurality of tables. Examples of the table T50 will be described later with reference to Figs. 6, 7A to 7C and 8.

In step S142, an operation of detecting the modulation order MO corresponding to the parameter and / or the transport block size TBS may be performed. In some embodiments, the controller 226 may detect the modulation order MO corresponding to the pair of the MCS index (I_MCS) and the subcarrier interval (SCS) as a parameter by referring to the table T50. In some embodiments, the controller 226 may detect a transport block size (TBS) corresponding to the number of physical resource blocks (N_PRB) as a parameter by referring to table T50.

Figure 6 is a diagram illustrating an example of a table (T50) of Figure 5 in accordance with an exemplary embodiment of the present disclosure. Specifically, FIG. 6 shows an MCS table (T_MCS ') including modulation orders (MOs) and TBS indices (I_TBS) corresponding to pairs of MCS index (I_MCS) and subcarrier interval (SCS). It is noted that the MCS table (T_MCS) in FIG. 6 is only an example, and different subcarrier spacing (SCS), modulation order (MO) and TBS index (I_TBS) are possible as shown in FIG.

The MCS table T_MCS 'of FIG. 6 includes the modulation order MO and the TBS index I_TBS according to the subcarrier interval SCS as well as the MCS index I_MCS when compared with the MCS table T_MCS of FIG. 3A . As described above with reference to FIG. 1, the subcarrier interval SCS may be associated with a modulation scheme and a transport block size (TBS). For example, as the subcarrier spacing (SCS) increases, the interferences between adjacent subcarriers may be reduced, and thus a modulation scheme of a higher modulation order (MO) may be used, while when the subcarrier spacing (SCS) The interference between the subcarriers may increase, so that a modulation scheme of low modulation order (MO) can be used. When the subcarrier interval SCS increases, the number of subcarriers included in the maximum bandwidth of the elementary carrier CC can be reduced, and thus the transmission block size TBS can be reduced. On the other hand, The number of sub-carriers included in the maximum bandwidth of the element carrier (CC) may increase, and thus the transmission block size (TBS) may increase.

Figures 7A-7C are diagrams illustrating examples of table T50 of Figure 5 in accordance with exemplary embodiments of the present disclosure. Specifically, FIGS. 7A to 7C show tables for detecting a transport block size (TBS) using a TBS table in a wireless communication system in which the number of symbols per TTI varies. 7A to 7C, the number of symbols per TTI may refer to the number of symbols per slot (N_SYM), and the number of symbols per slot (N_SYM) may range from 1 to k (k is an integer greater than 1).

Referring to FIG. 7A, in some embodiments, a plurality of TBS tables T_TBS1, T_TBS2, ..., T_TBSk may be used, corresponding to a number of symbols N_SYM per a plurality of slots. For example, the controller 226 of FIG. 1 may obtain the number of symbols per slot (N_SYM) and may calculate the number of symbols per slot (N_SYM) among the plurality of TBS tables (T_TBS1, T_TBS2, ..., T_TBSk) One corresponding TBS table can be selected. Next, the controller 226 can detect in the selected TBS table the transport block size (TBS) corresponding to the detected TBS index (I_TBS) and the number of physical resource blocks (N_PRB). In some embodiments, 14 TBS tables may be used depending on the range of the number of symbols per slot (N_SYM) of 1 to 14. Further, in some embodiments, the wireless communication system may define the number of symbols per slot (N_SYM) as predefined values, instead of defining the number of symbols per slot (N_SYM) TBS tables corresponding to the number of symbols N_SYM can be used.

Referring to FIG. 7B, in some embodiments, a plurality of TBS table groups TS_TBS1, TS_TBS2, ..., TS_TBS2 corresponding to a plurality of symbol number N_SYMs and a plurality of CFIs (Control Format Indicators) TS_TBS2k) may be used. For example, the TBS tables included in the first TBS table group TS_TBS1 may include transport block sizes (TBS) optimized according to the CFI values when the number of symbols per slot (N_SYM) is one. The controller 226 of FIG. 1 can obtain the number of symbols per slot (N_SYM) and select a jth TBS table group (TS_TBSj, 1? J? K) corresponding to the number of symbols per slot (N_SYM). The controller 226 can select the TBS table (T_TBS) corresponding to the CFI among the TBS tables included in the selected jth TBS table group (TS_TBSj), obtain the CFI, refer to the selected TBS table (T_TBS) (TBS) corresponding to the TBS index (I_TBS) and the number of physical resource blocks (N_PRB). Thus, by referring to a plurality of tables, the amount of parameters transmitted from the base station 100 to the user equipment 200 can be reduced, thereby reducing the overhead required to transmit the parameters, e.g., the downlink control information DCI Decoding / decoding overhead can be reduced.

Referring to Figure 7C, in some embodiments, at least one TBS table and function may be used. For example, as shown in FIG. 7C, the TBS table T_TBSi corresponding to the number of symbols N_SYM per slot, which is i (1? I? K), and the transport block size TBSi of the TBS table T_TBSi, And a number of symbols per slot (N_SYM) as arguments may be used. The controller 226 can detect the transport block size TBSi corresponding to the detected TBS index I_TBS and the number of physical resource blocks N_PRB by referring to the TBS table T_TBSi. The controller 226 may then calculate the transport block size (TBS) from the detected transport block size TBSi and the number of symbols per slot N_SYM obtained based on function f.

In some embodiments, the function f may monotonically increase with respect to the number of symbols per slot (N_SYM). The number of resource elements RE that can be used as data can be determined according to the value of the number of symbols per slot N_SYM and the code rate CR is generally inversely proportional to the number of resource elements RE And the average decoding performance in the same channel environment can be improved as the negative efficiency (CR) is smaller. Accordingly, as the number of symbols per slot (N_SYM) increases, the transport block size (TBS) may increase linearly or nonlinearly. For example, the TBS table T_TBSi may correspond to the number of symbols per slot N_SYM (i = 1) and the function f may correspond to the transport block size TBSi detected from the TBS table T_TBSi, And the number of symbols per slot (N_SYM). Although FIG. 7C illustrates an example using one TBS table (T_TBSi) and one function (f), it is to be appreciated that in some embodiments more than one TBS tables and / or two or more functions may be used will be.

Figure 8 is a flow chart illustrating an example of step S140 of Figure 4 in accordance with an exemplary embodiment of the present disclosure. As described above with reference to Fig. 4, the operation of detecting the modulation order MO and the transport block size TBS in step S140 " of Fig. 8 may be performed, and as shown in Fig. 8, step S140 " May include steps S143 and S144. In some embodiments, step S140 " of FIG. 8 may be performed by the controller 226 of FIG. 1, and hereinafter, FIG. 8 will be described with reference to FIG.

In step S143, an operation referring to a predefined function may be performed. For example, the controller 226 may refer to a function F80 having as an argument at least one parameter defining a transmission format (TF). The function F80 may be defined by the wireless communication system 10 and the base station 100 and the user equipment 200 may store the function F80 in common. For example, the function F80 directly defines the transmission format (TF) such as the subcarrier spacing SCS, modulation order MO, CFI, number of symbols per slot N_SYM, number of physical resource blocks N_PRB, , And may have at least one of the values indirectly defining the transmission format (TF), such as an MCS index (I_MCS), a TBS index (I_TBS), or the like. In some embodiments, controller 226 may reference two or more functions.

In step S144, an operation of calculating a transport block size (TBS) from the parameter may be performed. For example, the controller 226 may calculate a transport block size (TBS) from a function g defined as: " (1) "

As shown in Equation (1), the transport block size TBS includes an MCS index I_MCS, a modulation order MO, a subcarrier spacing SCS, a CFI, a number of symbols per slot N_SYM, And a function (g) of the TBS index (I_TBS). As described above with reference to FIG. 3B, the number of transport block sizes (TBS) defined according to the TBS index (I_TBS) and the number of physical resource blocks (N_PRB) can be large. Also, the number of physical resource blocks (N_PRB) defined by the radio communication system 10 can increase, and accordingly, the range of the transport block size (TBS) can be remarkably increased. In addition, the transport block size (TBS) may be further subdivided in order to set an optimized transport block size (TBS) according to the number of symbols per slot (N_SYM) and the CFI. Instead of increasing the size of the TBS table, the range and granularity of the transport block size (TBS) can be achieved by calculating the transport block size (TBS) from a function of the parameters associated with the transport block size (TBS).

9 is a flow diagram illustrating a wireless communication method in accordance with an exemplary embodiment of the present disclosure. Compared with the method S100 of FIG. 4, the method S200 of FIG. 9 can identify at least one communication setting included in the transmission format TF from the downlink control information DCI. As shown in FIG. 9, the method S200 of FIG. 9 may include a plurality of steps S220, S240, S260, S280. In some embodiments, method S200 of FIG. 9 may be performed by signal processor 220 for processing of signals received on downlink 14 of FIG. Hereinafter, FIG. 9 will be described with reference to FIG. 1, and redundant description of FIG. 1 will be omitted from description of FIG.

In step S220, an operation of obtaining downlink control information (DCI) may be performed. For example, the controller 226 may receive the downlink control information (DCI) included in the control area of FIG. 2 from the PHY block 224.

In step S240, an operation of extracting at least one field may be performed. For example, the downlink control information DCI includes at least one communication setting included in the transmission format TF, for example, at least one of modulation order MO, number of physical resource blocks N_PRB, and transmission block size TBS And the controller 226 may extract at least one field from the downlink control information (DCI).

In step S260, an operation of identifying at least one communication setting may be performed. The field extracted in step S240 may directly indicate the value of the communication setting in some embodiments and may indirectly indicate the value of the communication setting in some embodiments. The controller 226 may identify the communication settings from the field, and " identification " herein may refer to deriving the results directly from the input without reference to the lookup table. Then, an operation of processing the received signal according to the communication setting identified in step S280 may be performed.

10 is a diagram illustrating downlink control information (DCI) according to an exemplary embodiment of the present disclosure. As described above with reference to FIG. 9, the downlink control information DCI may include at least one field corresponding to at least one communication setting included in the transmission format TF.

10, the downlink control information DCI includes a first field F_MO corresponding to the modulation order MO and having x bits, a second field F_MO corresponding to the number of physical resource blocks N_PRB, 2 field F_PRB and a third field F_TBS corresponding to the transport block size TBS and having a z bit number. Although the downlink control information DCI in FIG. 10 includes fields corresponding to both the modulation order MO, the number of physical resource blocks N_PRB, and the transport block size TBS, in some embodiments, The information DCI may include only fields corresponding to some of the modulation order (MO), the number of physical resource blocks (N_PRB), and the transport block size (TBS).

In some embodiments, the fields included in the downlink control information (DCI) may directly indicate the communication settings. For example, the first field F_MO may have a 3-bit number to represent QPSK (or 4QAM), 16QAM, 64QAM, 256QAM and 1024QAM as defined by the 5G system The field F_PRB may have a 10-bit number (i.e., y = 10) to indicate the maximum number of 550 physical resource blocks (N_PRB) defined by the 5G system transport block size can have a number of "log ₂ (TBSmax)" bits obtained from the maximum value (TBSmax) of (TBS) _{(i.e., z = log 2 (TBSmax)} ) to.

In some embodiments, the fields included in the downlink control information (DCI) may indirectly indicate communication settings. For example, the number of bits z of the third field F_TBS is limited due to the large range of the transport block size (TBS), while the number of bits of the transport block size (F_TBS) is limited from the value of the third field F_TBS (TBS) can be derived. For example, when a, b, c, d, and e are bits included in the third field F_TBS, the transport block size TBS can be derived as follows.

In some embodiments, the third field F_TBS may represent a TBS index (I_TBS). That is, compared with the example of FIGS. 3A and 3B, the TBS index I_TBS can be directly transmitted to the user equipment 200 through the downlink control information DCI instead of being detected from the TBS table or the like. In some embodiments, the transport block size (TBS) is determined using TBS tables (T_TBS1, T_TBS2, ..., T_TBSk) corresponding to the number of symbols per slot (N_SYM) per slot, Can be detected. Also, in some embodiments, a transport block size (TBS) may be detected using one TBS table (T_TBSi) and function (f), as described above with reference to Figure 7C.

11 is a flow diagram illustrating a wireless communication method in accordance with an exemplary embodiment of the present disclosure; Compared with the method S100 of Fig. 4 and the method S200 of Fig. 9, the method S300 of Fig. 11 can change the transmission format TF using the downlink control information DCI including the adjustment indicator have. As shown in FIG. 11, the method S300 of FIG. 11 may include a plurality of steps S320, S340, S360, S380. In some embodiments, method S300 of FIG. 11 may be performed by signal processor 220 for processing of signals received on downlink 14 of FIG. Hereinafter, FIG. 11 will be described with reference to FIG. 1, and duplicated description of FIG. 1 and FIG. 4 will be omitted.

In step S320, an operation of determining the modulation order MO and the transport block size TBS may be performed. For example, the controller 226 may use the tables T_MCS, T_TBS in Figures 3A and 3B, or use the modulation order (MO) and transport block size (TBS) in accordance with the exemplary embodiments of the present disclosure described above Can be determined.

In step S340, an operation of determining whether or not the adjustment indication is received may be performed. For example, the downlink control information DCI may include a field corresponding to the adjustment indicator, and the field corresponding to the adjustment indicator may include a bit indicating whether the adjustment indicator is valid. The controller 226 can determine whether or not the adjustment indicator is received based on the bit indicating validity. An example of the adjustment indicator will be described later with reference to FIG. If an adjustment indicator is received, step S360 may be performed subsequently, while if an adjustment indication is not received, step S380 may be performed subsequently.

In step S360, an operation of updating at least one of the modulation order MO and the transport block size TBS may be performed. For example, the controller 226 may change at least one of the modulation order (MO) and the transport block size (TBS) determined in step S320 based on the adjustment indication. The controller 226 can increase or decrease the modulation order MO based on the adjustment indicator and increase or decrease the transmission block size TBS. Next, in step S380, an operation of processing the received signal according to the updated modulation order MO and the transport block size TBS may be performed.

12 is a diagram illustrating downlink control information (DCI) according to an exemplary embodiment of the present disclosure. As shown in FIG. 12, the downlink control information DCI may include an adjustment field F_ADJ corresponding to the adjustment indicator, and an adjustment field F_ADJ corresponding to the adjustment indicator may include a validity indicator of the adjustment indicator A second adjustment field TBS_ADJ corresponding to a validity bit (E) representing a modulation order (MO) and representing a first adjustment field (MO_ADJ) and a transport block size (TBS) ). 12, the adjustment field F_ADJ corresponding to the adjustment indicator may include only one of the first and second adjustment fields MO_ADJ and TBS_ADJ.

According to an exemplary embodiment of the present disclosure, the adjustment indicator may include at least one of an increase / decrease, a change, and a change value of the modulation order (MO). In some embodiments, the first adjustment field MO_ADJ may include at least one bit indicative of an increase / decrease of the modulation order MO, and the controller 226 may compare the value of the first adjustment field MO_ADJ Thereby increasing or decreasing the modulation order MO by a predefined offset. In some embodiments, the first adjustment field MO_ADJ may include at least one bit indicative of the amount of change in the modulation order MO, and the controller 226 may adjust the value of the modulation field MO_ADJ according to the value of the first adjustment field MO_ADJ, The amount of change can be reflected in the degree MO. In some embodiments, the first adjustment field MO_ADJ may include at least one bit indicative of a change value of the modulation order MO, and the controller 226 may adjust the first adjustment field MO_ADJ according to the value of the first adjustment field MO_ADJ The modulation order (MO) can be updated to the changed value.

According to an exemplary embodiment of the present disclosure, the adjustment indicator may include at least one of an increase / decrease, a change, and a change value of a transport block size (TBS). In some embodiments, the second adjustment field TBS_ADJ may include at least one bit indicative of an increase / decrease in the transport block size (TBS), and the controller 226 may compare the value of the second adjustment field TBS_ADJ The transmission block size (TBS) can be increased or decreased by a predefined offset according to the transmission block size (TBS). In some embodiments, the second adjustment field TBS_ADJ may include at least one bit indicative of the amount of change in the transport block size (TBS), and the controller 226 may adjust the value of the second adjustment field TBS_ADJ The amount of change can be reflected in the transport block size (TBS). In some embodiments, the second adjustment field TBS_ADJ may include at least one bit indicative of a change in the transport block size (TBS), and the controller 226 may compare the value of the second adjustment field TBS_ADJ The transmission block size (TBS) can be updated with the changed value.

FIG. 13 shows an exemplary block diagram of a wireless communication device 300 in accordance with an exemplary embodiment of the present disclosure. 13, the wireless communication apparatus 300 includes an Application Specific Integrated Circuit (ASIC) 310, an Application Specific Instruction Set Processor (ASIP) 330, a memory 350, a main processor 370, And a memory 390. Two or more of the ASIC 310, the ASIP 330, and the main processor 370 may communicate with each other. At least two of the ASIC 310, the ASIP 330, the memory 350, the main processor 370, and the main memory 390 may be embedded in one chip.

The ASIP 330 is an integrated circuit customized for a particular application and can support a dedicated instruction set for a particular application and execute instructions contained in the instruction set. Memory 350 may communicate with ASIP 330 and may store a plurality of instructions executed by ASIP 330 as non-volatile storage. For example, the memory 350 may include, but is not limited to, a random access memory (RAM), read only memory (ROM), tape, magnetic disk, optical disk, volatile memory, non- And may include any type of memory accessible by the ASIP 330. [

The main processor 370 can control the wireless communication device 300 by executing a plurality of commands. For example, main processor 370 may control ASIC 310 and ASIP 330, process data received over the wireless communication network, or process user input to wireless communication device 300 It is possible. Main memory 390 may communicate with main processor 370 and may store a plurality of instructions executed by main processor 370 as non-volatile storage. For example, the main memory 390 may include, but is not limited to, RAM (Random Access Memory), ROM (Read Only Memory), tape, magnetic disk, optical disk, volatile memory, nonvolatile memory, , And any type of memory accessible by the main processor 370.

The wireless communication method according to the exemplary embodiment of the present disclosure described above may be performed by at least one of the components included in the wireless communication apparatus of Fig. In some embodiments, at least one of the steps of the wireless communication method, the signal processor 120 and / or the signal processor 220 of FIG. 1, may be implemented as a plurality of instructions stored in the memory 350. At least one of the steps of the wireless communication method by performing a plurality of instructions stored in memory 350 by ASIP 330, at least one of the operations of signal processor 120 and / or signal processor 220 of FIG. 1 Can be performed. In some embodiments, at least one of the steps of the wireless communication method, the signal processor 120 and / or the signal processor 220 of FIG. 1, may be implemented as a hardware block designed through logic synthesis, ). In some embodiments, at least one of the steps of the wireless communication method, the signal processor 120 and / or the signal processor 220 of FIG. 1, may be implemented as a plurality of instructions stored in the main memory 390 And at least one of the steps of the wireless communication method by executing a plurality of instructions stored in the main memory 390 of the main processor 370, the signal processor 120 of FIG. 1 and / or the signal processor 220 At least a portion of the operation can be performed.

As described above, exemplary embodiments have been disclosed in the drawings and specification. Although the embodiments have been described herein with reference to specific terms, it should be understood that they have been used only for the purpose of describing the technical idea of the present disclosure and not for limiting the scope of the present disclosure as defined in the claims . Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of protection of the present disclosure should be determined by the technical idea of the appended claims.

Claims (10)

CLAIMS What is claimed is: 1. A method for processing a signal received over a wireless link,
Obtaining at least one parameter including sub-carrier spacing (SCS);
Detecting a modulation order and a transport block size based on the at least one parameter; And
And processing the received signal based on the detected modulation order and the transport block size. The method according to claim 1,
Wherein obtaining the at least one parameter comprises obtaining a Modulation and Coding Scheme (MCS) index,
Wherein the detecting step includes a step of detecting a subcarrier interval corresponding to the obtained subcarrier interval and the obtained MCS index by referring to a Modulation and Coding Scheme (MCS) table including a plurality of modulation orders corresponding to a plurality of pairs of subcarrier intervals and MCS indexes And detecting the modulation order. The method of claim 2,
The MCS table includes a plurality of TBS (Transport Block Size) indexes corresponding to a plurality of pairs of subcarrier interval and MCS indexes,
The method may further comprise detecting a TBS index corresponding to the subcarrier interval and the obtained MCS index obtained by referring to the MCS table,
Wherein obtaining the at least one parameter further comprises obtaining a physical resource block number,
Wherein the step of detecting the modulation order and the transport block size comprises detecting the transport block size based on the number of physical resource blocks obtained and the detected TBS index. The method of claim 3,
Wherein the step of detecting the transport block size comprises: referring to a TBS table including a plurality of transport block sizes corresponding to a plurality of pairs of the TBS index and the number of physical resource blocks, And detects the transport block size corresponding to the index. The method of claim 4,
Wherein obtaining the at least one parameter further comprises obtaining a number of symbols per slot,
The step of detecting the transport block size may further include detecting a number of physical resource blocks, a detected TBS index, and a number of symbols per slot obtained by referring to a plurality of TBS tables corresponding to the number of symbols per a plurality of slots And detecting the corresponding transport block size. The method of claim 5,
Wherein obtaining the at least one parameter further comprises obtaining a CFI (Control Format Indicator)
The step of detecting the transport block size may include detecting the number of physical resource blocks obtained, the detected TBS index, the number of the detected physical block number per slot, The number of symbols and the transport block size corresponding to the obtained CFI. The method of claim 4,
Wherein obtaining the at least one parameter further comprises obtaining a number of symbols per slot,
Wherein the step of detecting the transport block size comprises:
Detecting a number of physical resource blocks obtained and a reference transport block size corresponding to the detected TBS index by referring to the TBS table; And
Calculating the transport block size from the number of symbols per slot obtained and the reference transport block size based on a predefined function. The method according to claim 1,
Wherein obtaining the at least one parameter comprises obtaining at least one of an MCS index, a number of physical resource blocks, a number of symbols per slot, and a CFI,
Wherein the step of detecting the modulation order and the transmission block size comprises the step of determining, from at least one of the subcarrier interval, the MCS index, the number of physical resource blocks, the number of symbols per slot, and the CFI, ≪ / RTI > wherein the step of calculating the size comprises calculating the size. CLAIMS What is claimed is: 1. A method for processing a signal received over a wireless link,
Obtaining DCI (Downlink Control Information);
Extracting at least one field corresponding to at least one of a modulation order, a physical resource block number, and a transport block size from the DCI;
Identifying at least one of the modulation order, the number of physical resource blocks, and the transport block size based on the value of the extracted at least one field; And
And processing the received signal based on the identified at least one value. CLAIMS What is claimed is: 1. A method for processing a signal received over a wireless link,
Obtaining an adjustment indicator indicating a change of at least one of a modulation order and a TBS (Transport Block Size) index;
Updating the modulation order and the TBS index by changing the at least one value in response to the adjustment indication; And
And processing the received signal based on the updated modulation order and the updated TBS index.

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