KR20190029397A - Apparatus and method for transmitting control information in wireless communication system - Google Patents

Abstract

This disclosure relates to a 5G (5th generation) or pre-5G communication system for supporting a higher data rate than a 4G (4th generation) communication system such as Long Term Evolution (LTE). According to various embodiments of the present disclosure, a base station in a wireless communication system includes at least one processor; and at least one transceiver operatively coupled to the at least one processor. The at least one processor is configured to mask an identifier for a terminal to at least one of a frozen bit region or a cyclic redundancy check (CRC) region to constitute a control signal, and the at least one transceiver is configured to transmit the control signal to the terminal. The length of the identifier may be less than the length of the CRC region.

Description

[0001] APPARATUS AND METHOD FOR TRANSMITTING CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM [0002]

BACKGROUND OF THE INVENTION [0002] This disclosure relates generally to wireless communication systems, and more specifically to an apparatus and method for transmitting control information in a wireless communication system.

Efforts are underway to develop improved 5G (5 ^th generation) communication systems or pre-5G communication systems to meet the increasing demand for wireless data traffic after commercialization of 4G (4 ^th generation) communication systems. For this reason, a 5G communication system or a pre-5G communication system is referred to as a 4G network (Beyond 4G Network) communication system or a LTE (Long Term Evolution) system (Post LTE) system.

To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In the 5G communication system, beamforming, massive MIMO, full-dimensional MIMO, and FD-MIMO are used in order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave. ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, in order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed.

In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), and the Advanced Connection Technology (FBMC) ), Non-Orthogonal Multiple Access (NOMA), and Sparse Code Multiple Access (SCMA).

The base station may mask the identifier of the terminal to the control information in order to transmit the control information to the terminal. On the other hand, the bit sequence length of the identifier of the terminal and the length of the masking region (region) may be different.

Based on the above discussion, the disclosure provides an apparatus and method for indicating an identifier of a terminal in a wireless communication system.

The present disclosure also provides an apparatus and method for masking an identifier of a terminal in a wireless communication system.

The present disclosure also provides an apparatus and method for masking an identifier of a terminal in a wireless communication system in an area excluding a payload of a downlink control signal.

The present disclosure also provides an apparatus and method for changing a masking method in accordance with the number of terminals' identifiers in a wireless communication system.

The present disclosure also provides an apparatus and method for masking in an area according to an identifier of a terminal in a wireless communication system.

According to various embodiments of the present disclosure, an apparatus of a base station in a wireless communication system includes at least one processor and at least one transceiver operably coupled to the at least one processor, Wherein the at least one transceiver is configured to mask the identifier for at least one of a frozen bit region or a cyclic redundancy check (CRC) region to transmit the control signal to the terminal And the length of the identifier may be smaller than the length of the CRC area.

According to various embodiments of the present disclosure, an apparatus of a terminal in a wireless communication system includes at least one processor and at least one transceiver operably coupled to the at least one processor, Wherein the at least one processor is operable to demodulate at least one of a frozen bit region or a CRC region of the control signal using an identifier for the terminal to generate control information for the terminal And the length of the identifier may be smaller than the length of the CRC area.

According to various embodiments of the present disclosure, in a wireless communication system, a method of operating a base station may mask an identifier for a terminal to at least one of a frozen bit region or a cyclic redundancy check (CRC) And transmitting the control signal to the mobile station, and the length of the identifier may be smaller than the length of the CRC region.

According to various embodiments of the present disclosure, in a wireless communication system, a method of operating a terminal includes the steps of receiving a control signal from a base station, and using the identifier for the terminal to generate a frozen bit region And demodulating at least one of a cyclic redundancy check (CRC) region to obtain control information for the mobile station. The length of the identifier may be smaller than the length of the CRC region.

The apparatus and method according to various embodiments of the present disclosure perform masking based on the identifier for the terminal, thereby reducing decoding complexity and reducing power consumption

The effects obtainable from the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below will be.

1 illustrates a wireless communication system in accordance with various embodiments of the present disclosure.
2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure.
3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure.
4A illustrates an example of masking in accordance with various embodiments of the present disclosure.
4B illustrates an operational flow of a base station constituting a control signal according to various embodiments of the present disclosure.
4C illustrates an operation flow of a terminal for decoding a control signal according to various embodiments of the present disclosure.
5A illustrates an example of CRC (cyclic redundancy check) masking according to various embodiments of the present disclosure.
Figure 5B illustrates another example of CRC masking in accordance with various embodiments of the present disclosure.
Figure 5C illustrates another example of CRC masking in accordance with various embodiments of the present disclosure.
5D illustrates an example of multiple identifiers in accordance with various embodiments of the present disclosure.
6 illustrates an operational flow of a base station constituting a control signal according to a masking region according to various embodiments of the present disclosure.
Figure 7A illustrates an example of adaptive masking in accordance with various embodiments of the present disclosure.
Figure 7B illustrates another example of adaptive masking in accordance with various embodiments of the present disclosure.
8 illustrates a base station and inter-terminal signaling flow for adaptive masking in accordance with various embodiments of the present disclosure.
9 shows a flow of a base station for partial masking according to various embodiments of the present disclosure.
10 illustrates an example of partial masking in accordance with various embodiments of the present disclosure.
FIG. 11 illustrates an example of common masking in accordance with various embodiments of the present disclosure.
Figure 12 illustrates another example of common masking in accordance with various embodiments of the present disclosure.
13 shows a flow of a base station for common masking in accordance with various embodiments of the present disclosure.
14 shows a flow of a base station for common masking in accordance with various embodiments of the present disclosure.

The terms used in this disclosure are used only to describe certain embodiments and may not be intended to limit the scope of other embodiments. The singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art. The general predefined terms used in this disclosure may be interpreted as having the same or similar meaning as the contextual meanings of the related art and, unless explicitly defined in the present disclosure, include ideally or in an excessively formal sense . In some cases, the terms defined in this disclosure can not be construed to exclude embodiments of the present disclosure.

In the various embodiments of the present disclosure described below, a hardware approach is illustrated by way of example. However, the various embodiments of the present disclosure do not exclude a software-based approach, since various embodiments of the present disclosure include techniques that use both hardware and software.

The present disclosure relates to an apparatus and method for masking an identifier (e.g., radio network temporary identifier (RNTI)) in a wireless communication system. description will be made of a technique for masking an identifier for a mobile station on a masking region including a frozen bit region and a cyclic redundancy check (CRC) region.

The terms used to refer to variables (e.g., length, area, location) related to information used in the following description, terms referring to network entities, terms referring to components of a device, . Accordingly, the present disclosure is not limited to the following terms, and other terms having equivalent technical meanings can be used.

Further, the present disclosure describes various embodiments using terms used in some communication standards (e.g., 3rd Generation Partnership Project (3GPP)), but this is merely illustrative. The various embodiments of the present disclosure can be easily modified and applied in other communication systems as well.

1 illustrates a wireless communication system in accordance with various embodiments of the present disclosure. 1 illustrates a base station 110 and a terminal 120 as a part of nodes using a wireless channel in a wireless communication system.

The base station 110 is a network infrastructure that provides a wireless connection to the terminal 120. The base station 110 has a coverage, or cell, defined as a certain geographic area based on the distance over which it can transmit signals. Hereinafter, the term 'cell' used may refer to a service coverage area at the base station. For convenience of description, the base station 110 of FIG. 1 is described as covering one cell, but may also cover multiple cells. Here, a plurality of cells can be classified according to frequencies to be supported and regions of a sector to be covered. In the following description, a base station may be used as a term including a cell, or a cell may be used as a term referring to a base station. The base station 110 includes an 'access point (AP)', 'eNodeB', '5G node', '5G NodeB, NB' , 'Wireless point', 'transmission / reception point (TRP)', or other terms having equivalent technical meanings.

The terminal 120 is a device used by a user and communicates with a base station 110 via a wireless channel. In some cases, the terminal 120 may be operated without user involvement. That is, the terminal 120 is an apparatus for performing machine type communication (MTC), and may not be carried by a user. The terminal 120 may be a terminal, a user equipment (UE), a mobile station, a subscriber station, a remote terminal, a wireless terminal, terminal ', or' user device 'or any other term having equivalent technical meanings.

The base station 110 may transmit control information (e.g., downlink control information (DCI)) to the terminal 120. The specific procedure is as follows.

In step 131, the base station 110 may assign an identifier for the terminal 120. The base station 110 may assign an identifier for the terminal 120 to the terminal 120 so as to identify the control information of the terminal 120.

In step 133, the base station 110 may provide an identifier to the terminal 120. Here, the base station 110 may implicitly or explicitly provide the identifier assigned to the terminal 120. [ For example, the base station 110 may allocate a TC-RNTI to the terminal 120 through a random access procedure, and then upgrade the C-RNTI to a C-RNTI or provide a new C-RNTI. In another example, the base station may determine whether to allocate additional RNTIs and, if necessary, provide a new RNTI value to the terminal 120 via higher layer signaling (e.g., RRC signaling).

In step 135, the base station 110 may configure a control signal. The base station 110 may manage radio resource allocation for the terminal 120. The base station 110 can transmit a control signal including control information indicating which resources the terminal 120 can use through a control channel (for example, a physical downlink control channel (PDCCH) Masking may be performed to identify the control information of the terminal 120. Here, masking refers to a process of generating an XOR (i.e., a masking area) in a region other than the payload including the downlink control information And a plurality of identifiers may be set according to the purpose of transmission of the control information in one terminal. The base station 110 may determine the purpose for transmitting the control information. The base station 110 can generate a control signal using an identifier according to the purpose.

The base station 110 may perform a polar encoding on the bit string for which the identifier is masked and then generate a control signal by assigning the pole encoded bit strings to the downlink resource region.

In step 137, the base station 110 may transmit a control signal to the terminal 120 through a downlink resource (e.g., a PDCCH resource). The downlink control information for which the identifier is masked is mapped in the PDCCH resource region via the channel encoding. The PDCCH resource region can be preassigned with a resource location that can be allocated according to whether the downlink control information is common or information of individual terminals. Here, a set of resource locations to which control information is allocated is referred to as a search space, and each resource location is referred to as a PDCCH candidate (PDCCH candidate). The BS 110 may simultaneously transmit control information of a plurality of UEs in a PDCCH resource.

In operation 139, the terminal 120 may decode the control signal. The terminal 120 obtains control information through polar decoding and identifier demasking of the received control signal. Specifically, the terminal 120 sequentially decodes control signals located in its search space and determines whether there is control information corresponding to its identifier. The terminal 120 may reverse the masking (e.g., RNTI masking) performed by the base station 110 to decode the control information. That is, the terminal 120 can perform demasking. For example, the terminal 120 can XOR the bit string corresponding to the identifier at the position of the received CRC bit string to obtain the original CRC bit string. After that, the terminal 120 can perform the CRC check step. When the terminal 120 determines that there is no error in the CRC bit sequence obtained after the demasking, the terminal 120 can determine that the decoded control information is the control information of the terminal 120 itself.

The terminal 120 can perform demarking to collate the identifiers set to the terminal 120 one by one in the resource region of the received control signal. When the terminal 120 corresponds to the identifier of the terminal 120 as a result of performing the demasking, the terminal 120 can confirm the use of the control information of the received control signal. The identifier may be determined to be a different bitstream according to the purpose of transmission of the control information. For example, the RNTIs described in this disclosure can be illustrated as the following table.

Identifier Usage C-RNTI It is intended for unicast transmission of UE, and performs demasking after RRC (radio resource control) connection. SI-RNTI
(system information-RNTI) And performs PDCCH demasking in a preset SI (system information) window section (SIBx (system information block x) transmission interval associated with a specific terminal) SPS C-RNTI
(semi-persistent scheduling C-RNTI) Semi-persistently scheduled For the purpose of unicast transmission, the demasking is performed for the interval between SPS activation, re-activation, release, and retransmission commands. TPC-RNTI
(transmit power control RNTI) Perform demasking on PDCCH for uplink power control

Referring to Table 1, the identifier may include a C-RNTI. The C-RNTI is a value allocated to identify a terminal to which a base station is connected after an initial connection, and can be used by the base station to identify resource information for transmitting data to one terminal. The UE can always perform demasking after RRC connection. Also, like the SPS-C-RNTI, the identifier may include an RNTI that identifies control information associated with a particular service, such as voice over internet protocol (VoIP).

Hereinafter, in the present disclosure, an identifier may be collectively referred to as an identifier or an RNTI defined by a new purpose or a new structure in order to distinguish terminals, control information, services, etc., in addition to the RNTI of LTE (Long Term Evolution) For example, multicast control information is newly defined for only a certain set of terminals, such as a group common PDCCH, and an identifier for distinguishing the control information can be separately defined. Also, as an example, a new structure identifier including a terminal identifier and a service identifier may be defined.

The present disclosure provides an apparatus and method for masking an identifier for identifying a wireless channel. The base station masks an identifier in a bit string composed of a frozen bit area, a payload area, and a CRC area in a control signal. Here, the frozen bit region is a bit string defined to perform channel coding using polar codes, and is a bit string shared between the base station and the terminal. A frozen bit may mean a bit to which a freeze value of zero is assigned to a less reliable bit position in the bit-channel. The identifier may be masked in at least one of the frozen bit region or the CRC region.

In the present disclosure, for convenience of description, the length of the frozen bit region, the length of the CRC region, and the length of the identifiers are illustrated as L, M, and N, respectively. In constructing the control signal, a bit string (hereinafter referred to as frozen bit string) corresponding to the frozen bit area, a bit string (hereinafter referred to as a payload bit string) corresponding to the payload, Hereinafter, the CRC bit string) may be configured in any order. For the sake of convenience of description, it is assumed that the frozen bit region, the payload region, and the CRC region sequence are configured in this order.

2 illustrates a configuration of a base station in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 2 can be understood as a configuration of the base station 110. FIG. Hereinafter, terms such as "part" and "group" refer to a unit for processing at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software have.

The wireless communication unit 210 performs functions for transmitting and receiving signals through a wireless channel. For example, the wireless communication unit 210 performs conversion between a baseband signal and a bit string according to a physical layer specification of the system. For example, at the time of data transmission, the wireless communication unit 210 generates complex symbols by encoding and modulating a transmission bit stream. Also, upon receiving the data, the wireless communication unit 210 demodulates and decodes the baseband signal to recover the received bit stream. Also, the wireless communication unit 210 up-converts the baseband signal to an RF (radio frequency) band signal, transmits the signal through the antenna, and downconverts the RF band signal received through the antenna to a baseband signal.

To this end, the wireless communication unit 210 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), and an analog to digital converter (ADC). In addition, the wireless communication unit 210 may include a plurality of transmission / reception paths. Further, the wireless communication unit 210 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the wireless communication unit 210 may be composed of a digital unit and an analog unit, and the analog unit may include a plurality of subunits according to operating power, an operating frequency, .

The wireless communication unit 210 transmits and receives signals as described above. Accordingly, all or a part of the wireless communication unit 210 may be referred to as a 'transmitting unit', a 'receiving unit', or a 'transceiver'. In the following description, the transmission and reception performed through the wireless channel are used to mean that the processing as described above is performed by the wireless communication unit 210. [

The backhaul communication unit 220 provides an interface for performing communication with other nodes in the network. That is, the backhaul communication unit 220 converts a bit string transmitted from the base station to another node, for example, another access node, another base station, an upper node, a core network, etc., into a physical signal, .

The storage unit 230 stores data such as a basic program, an application program, and setting information for operation of the base station. The storage unit 230 may be composed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. The storage unit 230 provides the stored data at the request of the control unit 240.

The control unit 240 controls the overall operations of the base station. For example, the control unit 240 transmits and receives signals through the wireless communication unit 210 or through the backhaul communication unit 220. [ In addition, the control unit 240 records and reads data in the storage unit 230. [ The control unit 240 can perform functions of a protocol stack required by the communication standard. To this end, the control unit 240 may include at least one processor. According to various embodiments, the control unit 240 may include a masking unit (not shown) for masking the identifier. Here, the masking unit may be a set of instructions or code stored in the storage unit 230, or may be a storage space storing at least a command / code or instruction / code residing in the control unit 240 at a minimum or a circuitry ). ≪ / RTI > For example, the control unit 240 may control the base station to perform operations according to various embodiments described below.

3 illustrates a configuration of a terminal in a wireless communication system according to various embodiments of the present disclosure. The configuration illustrated in FIG. 3 can be understood as a configuration of the terminal 120. FIG. Hereinafter, terms such as "part" and "group" refer to a unit for processing at least one function or operation, which may be implemented by hardware, software, or a combination of hardware and software have.

Referring to FIG. 3, the terminal includes a communication unit 310, a storage unit 320, and a control unit 330.

The communication unit 310 performs functions for transmitting and receiving signals through a wireless channel. For example, the communication unit 310 performs conversion between a baseband signal and a bit string according to a physical layer specification of the system. For example, at the time of data transmission, the communication unit 310 generates complex symbols by encoding and modulating a transmission bit stream. Also, upon receiving the data, the communication unit 310 demodulates and decodes the baseband signal to recover the received bit stream. In addition, the communication unit 310 up-converts the baseband signal to an RF band signal, transmits the RF band signal through the antenna, and down converts the RF band signal received through the antenna to a baseband signal. For example, the communication unit 310 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like. In particular, according to various embodiments, the controller 330 may include a decoder (not shown) for decoding the control signal received by the terminal. Here, the decoder can perform the polar decoding or perform the demasking through the identifier for the terminal.

In addition, the communication unit 310 may include a plurality of transmission / reception paths. Further, the communication unit 310 may include at least one antenna array composed of a plurality of antenna elements. In terms of hardware, the wireless communication unit 210 may be composed of digital circuitry and analog circuitry (e.g., RFIC (radio frequency integrated circuit)). Here, the digital circuit and the analog circuit can be implemented in one package. In addition, the communication unit 310 may include a plurality of RF chains. Further, the communication unit 310 can perform beamforming.

In addition, the communication unit 310 may include different communication modules for processing signals of different frequency bands. Further, the communication unit 310 may include a plurality of communication modules to support a plurality of different wireless connection technologies. For example, different wireless access technologies may include Bluetooth low energy (BLE), Wireless Fidelity (Wi-Fi), WiGig (WiFi Gigabyte), cellular networks such as Long Term Evolution In addition, different frequency bands may include a super high frequency (SHF) band (e.g., 2.5 GHz, 5 GHz) and a millimeter wave (e.g., 60 GHz) band.

The communication unit 310 transmits and receives signals as described above. Accordingly, the communication unit 310 may be referred to as a 'transmission unit', a 'reception unit', or a 'transmission / reception unit'. In the following description, the transmission and reception performed through the wireless channel are used to mean that the processing as described above is performed by the communication unit 310. [

The storage unit 320 stores data such as a basic program, an application program, and setting information for operation of the terminal. The storage unit 320 may be composed of a volatile memory, a nonvolatile memory, or a combination of a volatile memory and a nonvolatile memory. The storage unit 320 provides the stored data at the request of the control unit 330.

The controller 330 controls overall operations of the terminal. For example, the control unit 330 transmits and receives signals through the communication unit 310. In addition, the controller 330 writes data to the storage unit 320 and reads the data. To this end, the control unit 330 may include at least one processor or a microprocessor, or may be part of a processor. Also, a part of the communication unit 310 and the control unit 330 may be referred to as a communication processor (CP). In addition, the control unit 330 may control the terminal 120 to perform operations according to various embodiments described below.

4A illustrates an example of masking in accordance with various embodiments of the present disclosure.

4A, the identifier 410 may be N bits (e.g., a ₀ , a ₁ , ..., a _{N - 1} ). The identifier 410 may be an identifier assigned to the terminal. For example, the identifier 410 may be 16 bits. May be _{-: (1 r 0, r} 1, ..., r M for example) extended (extended) identifier 420 is M bits. M may be a natural number greater than N. For example, the identifier 420 may be 24 bits. May be _{-: (1 p 0, p} 1, ..., p M for example), the masked area 430 is M bits. The length of the masking area 430 may be equal to the length of the extension identifier 420. The identifier-masked region 440 may be M bits. The identifier-masked area 440 may refer to an area where the extension identifier 420 is masked in the masking area 430.

The base station may mask the identifier of the terminal in the masking area. On the other hand, if the length of the identifier of the terminal differs from the length of the masking area, for example, if the length of the identifier of the terminal is shorter than the length of the masking area, the base station can convert the identifier 420 of the terminal into the extension identifier 430. The base station can convert the identifier of the UE having the N-bit length into the extension identifier having the M-bit length. In some embodiments, the base station may configure a bit string of the M-bit length extended identifier by filling the bit string of the N-bit length terminal identifier with an M-N length dummy bit string. In some other embodiments, the base station may convert the identifier of the terminal to an extension identifier via a mapping function to extend the N-bit length to M-bit length. Examples of converting the existing identifier of the terminal into a length corresponding to the masking area, that is, conversion into an extension identifier will be described in detail with reference to FIGS. 5A to 5C described later.

The base station may mask the extension identifier 420 in the masking area 430 through an XOR operation. For example, the base station may perform the masking by modulo arithmetic on the i-th bit of each area. The i-th bit of the identifier-masked region 440 may be determined as m _i = (r _i + p _i ) mod 2.

On the other hand, in Fig. 4, some of the extended identifiers 420 may include unmasked areas. That is, according to some embodiments, instead of performing masking by filling in a pseudo bit string in a portion that does not correspond to the identifier, the base station may not mask portions that do not correspond to the identifier.

In accordance with various embodiments of the present disclosure, the masking region 430 may include at least one of a frozen bit region or a CRC region.

When decoding the control signal, the terminal may demodulate the polar decoding or the identifier. Depending on the masking region, the UE may verify whether a CRC error is caused only through polar decoding, or may perform CRC region decoding to verify whether a CRC error has occurred after performing polar decoding.

In the case of frozen bit masking, if the terminal performs polar decoding, it can simultaneously perform demasking in the frozen bit region. Since the UE can determine whether the corresponding control signal is a control signal for the UE during demasking of the frozen bit region, unnecessary decoding procedures can be reduced. In the case of CRC masking, the terminal may determine whether there is an error in the payload by performing a demasking of the identifier in the decoded CRC area. If an error occurs, the terminal can retry the CRC verification by demasking it with a new identifier, that is, an identifier that has been previously demasked and a different kind of identifier. In the CRC masking, the polar decoding is performed and completed only once for the control signal located in one PDCCH candidate, so that stable decoding complexity can be guaranteed from an average viewpoint.

4B illustrates an operational flow of a base station constituting a control signal according to various embodiments of the present disclosure. The base station exemplifies the base station 110 of FIG.

In step 451, the BS may construct a control signal by masking an identifier for the UE to at least one of a frozen bit region and a CRC region. In some embodiments, the base station may determine an area to mask the identifier for the terminal according to the number of identifiers preset to the terminal. In some other embodiments, the base station may determine an area to mask the identifier for the terminal according to the type of identifier to assign to the terminal. In some other embodiments, the base station may determine the area to be masked according to the frequency of transmissions of the identifier to be allocated.

The base station may determine at least one of a frozen bit region or a CRC region as a masking region. For example, the base station may perform adaptive masking, which selectively masks one of the frozen bit region or the CRC region. In another example, the base station may perform separate masking (also referred to as partial masking) to separate the components of the identifier, some to the frozen bit region, and the other to the CRC region.

In step 453, the BS may transmit a control signal to the MS. The base station can generate codewords by performing channel coding on the bit strings subjected to masking. The base station performs scrambling, modulation, layer mapping, precoding, or CP insertion on the codewords to generate control signals Can be generated. The base station can transmit the generated control signal to the terminal.

4C illustrates an operation flow of a terminal for decoding a control signal according to various embodiments of the present disclosure. The terminal exemplifies the terminal 120 of FIG.

In step 461, the terminal may receive a control signal from the base station.

In step 463, the UE can derive control information of the UE by demasking at least one of the frozen bit region or the CRC region of the control signal using the identifier of the UE.

The terminal can determine the masking area. In some embodiments, the terminal may receive indication information from the base station to determine whether the masking region is a CRC region or a frozen bit region. In some other embodiments, the terminal may determine the masking area based on the number of identifiers set in the terminal.

The terminal may perform channel decoding on the control signal received from the base station. The UE can perform polar decoding on the control signal encoded with the polar sign. The terminal may demask an identifier of a terminal masked in the frozen bit region through polar decoding or after demodulating the identifier of the terminal masked in the CRC region.

Hereinafter, examples in which the identifier of the UE is masked in the CRC area as the masking area will be described with reference to FIGS. 5A to 5B. Specifically, a scheme for processing the remaining area is described because the length of the identifier is shorter than the length of the masking area.

5A illustrates an example of CRC masking in accordance with various embodiments of the present disclosure.

5A illustrates an example in which an RNTI bit string is masked only at a fixed N bit position in the CRC area 501 of M-bit length, and a dummy bit string is masked in the remaining CRC area. Where the remaining M-N bits for which the RNTI is not masked may be transmitted with the original CRC bits without masking or may be masked with predefined dummy bit strings between the base station and the terminals. 5A is generally applied when M is greater than or equal to N, i.e., when the length of the masking area (CRC area) is greater than the length of the CRC area 501. Hereinafter, for convenience of description, M = 24 and N = 16 are described as examples. In FIG. 5A, each number indicates the bit position of the CRC and RNTI, and the position of the unmasked bits or the location of the dummy bits is shown blank.

The first bit string 511 of the first RNTI may be masked at consecutive positions starting from the 0th bit of the CRC area 501. [ Likewise, the second bit stream 512 of the second RNTI and the third bit stream 513 of the third RNTI may be masked at consecutive locations starting with the eighth and fourth bit of the CRC region 501, respectively. The fourth bit stream 514 of the fourth RNTI and the fifth bit stream 515 of the fifth RNTI are masked so as not to overlap with each other by dividing into a plurality of subsequences (hereinafter, sub-sequences) The starting point of each partial column can be set differently. For example, when dividing the M bit RNTI into K equal parts, the starting point of k (k = 0, ..., K-1) th partial sequence can be expressed as k * ceil (N / M). The fourth bit stream 514 of the fourth RNTI, and the fifth bit stream 515 of the fifth RNTI are set to K = 2 and 8, respectively.

On the other hand, unlike the one shown in FIG. 5A, the length of each partial column and the length of the non-masked CRC bit string between partial rows can be set to be different from each other. In addition, the lengths of the dummy bit strings between the respective partial rows may not be the same.

Figure 5B illustrates another example of CRC masking in accordance with various embodiments of the present disclosure.

5B, examples of masking an RNTI bit string (e.g., N-bit) at the N-bit position among the CRC regions (e.g., M-bits), wherein different RNTI's are masked at different positions . That is, the positions of the dummy bit strings are different from each other in the RNTI values. 5B is generally applied when M is greater than or equal to N, that is, when the length of the masking area (CRC area) is greater than the length of the CRC area. For convenience of explanation, M = 24 And N = 16 are described as an example.

In some embodiments, the base station may set the starting position in the masking region differently according to the RNTI value. For example, the base station may mask the first bit string 531 of the first RNTI and the second bit string 532 of the second RNTI at consecutive locations of the CRC area 521, and may set the starting point of the location to be masked differently for each RNTI have.

In some other embodiments, the base station may set the start position and the number of subsequences differently in the masking region according to the RNTI value. For example, the base station may set the masking start position of the third bit string 551 of the third RNTI to the start bit (0th bit) of the CRC area 541, and not set the subsequence. The base station may set the masking start position of the fourth bit string 552 of the fourth RNTI to the second bit of the CRC area 541 and set the number of subsequences to four. Meanwhile, although not shown in FIG. 5B, the BS may cyclically place the RNTI on the CRC region according to the starting point of the RNTI, thereby masking the RNTI.

Figure 5C illustrates another example of CRC masking in accordance with various embodiments of the present disclosure.

Referring to FIG. 5C, embodiments in which an N-bit RNTI bit string is converted into a new bit string having an M-bit length and are masked to the entire CRC will be described. That is, the base station can convert an N-bit-length RNTI bit string into a new M-bit bit string through a mapping function, that is, generate an extended bit string. When the N bit RNTI information is X, it is defined as an extended bit string Y = f (X), where f denotes the mapping function described above. The mapping function may be variously defined according to a design method. For example, when the expanded bit strings corresponding to the first bit string X1 571 and the second bit string X2 572 of different RNTIs are defined as y1 = f (x1) 581 and y2 = f (x2) 582, Can be expressed as a function that maximizes the minimum value of the bit difference between y1 and y2. By maximizing the bit difference between the identifiers, the resolution for detecting the identifier can be increased. On the other hand, a mapping function can be defined based on various criteria. The first bit string X1 571 corresponding to the first RNTI value is converted into a first extended bit string Y1 581 of M-bit length by a predetermined mapping function and is masked in the entire CRC area 561. [ The second bit string X2 572 corresponding to the second RNTI value is converted into the second extended bit string Y2 582 of M-bit length and is masked in the CRC area 561. [

5A to 5C illustrate embodiments in which an identifier for a terminal in a CRC area is masked (hereinafter referred to as CRC masking). On the other hand, while identifier-de-masking (e.g., RNTI demasking) for CRC masking is performed after polar decoding, masking on frozen bit regions (hereinafter frozen bit masking) At the same time in the pole decoding stage, the identifier-demasking must be performed at the same time. The terminal may determine that the identifier on the received control signal does not match the identifier of the terminal while performing the pole decoding and may terminate the polling if it is determined that the identifier is different from the identifier of the terminal . When there are a plurality of sets of identifiers, the terminal may perform the pole decoding several times to check whether the corresponding control information is associated with each identifier. In this case, the decoding complexity may increase depending on the number of identifiers.

Hereinafter, in the present disclosure, embodiments in which an identifier can be masked not only in the CRC region but also in the frozen bit region are described in order to minimize the number of pole decoding. That is, the base station may mask the identifier for the terminal to at least one of the CRC region or the frozen bit region. For example, the base station may select and mask the identifier for the terminal from either the CRC region or the frozen bit region. When masking the frozen bit region, the length of the masking region 430 shown in FIG. 4A may be replaced with L-bits instead of M-bits.

When there are a plurality of identifiers set in the terminal, that is, when the number of identifiers set in the terminal is two or more, the base station converts a plurality of identifiers into one sequence in order to minimize the number of pole decoding of the terminal, It is possible to mask the bit area. The base station may mask the identifier for obtaining the actual control information in the CRC area. Here, one sequence converted from a plurality of identifiers may be referred to as a multi-identifier (multi-RNTI). For example, multiple identifiers may have a longer length than an identifier. The UE may perform one polarity decoding using multiple identifiers and acquire the control information by a method of distinguishing the identifiers actually used in the CRC checking step.

5D illustrates an example of multiple identifiers in accordance with various embodiments of the present disclosure. The multiple identifiers may be configured based on the first identifier and the second identifier. According to various embodiments, the base station may configure multiple identifiers based on the first identifier and the second identifier.

Referring to FIG. 5D, in some embodiments, multiple identifiers 593 may be constructed in which a first bit string and a second bit string are arranged in order for a first bit string X1 591 and a second bit string X2 592 of different RNTIs have. In some other embodiments, multiple identifiers 594 arranged in the order of the second bit string and the first bit string may be constructed. In some other embodiments, multiple identifiers 595 may be configured to arrange the first bit string X1 591 and the second bit string X2 592 in a predetermined order crossing each other. In some other embodiments, a function based on the first bit string X1 591 and the second bit string X2 592 may be defined as g (X1, X2). The base station may configure multiple identifiers Y = g (X1, X2) 596. For example, the function g may be a function of designing a long sequence having a seed as a sum of input bit strings, an XOR operation value, or the like. The length of the bit string Y calculated by the function g may be smaller than or equal to the masking area.

In some embodiments, configuration information for a scheme for configuring multiple identifiers may be signaled from the base station to the terminal. For example, the base station may transmit configuration information for multiple identifiers to the terminal via an RRC message (e.g., an RRC connection related message). For example, the base station may transmit configuration information for multiple identifiers to a terminal through a medium access control (MAC) CE control element or DCI (downlink control information).

FIG. 5D illustrates two different identifiers as an example, but is generally applicable to cases where there are two or more different identifiers (e.g., RNTI).

Further, if the length of the constructed multiple identifiers is different from the length of the masking region, the base station may perform additional operations such as the above-described embodiments (e.g., extension identifiers) such that the length of the multiple identifiers corresponds to the length of the masking region .

6 illustrates an operational flow of a base station constituting a control signal according to a masking region according to various embodiments of the present disclosure. The base station exemplifies the base station 110 of FIG.

Referring to FIG. 6, in step 601, a base station can determine an identifier according to a purpose of transmission of control information. The identifier may be an identifier for the terminal. For example, the identifier may be a C-RNTI, which is a terminal-identifier for identifying the terminal. For another example, the identifier may be an SPS C-RNTI, a service-identifier for indicating a specific service of the terminal.

In step 603, the BS may determine whether to mask the identifier of step 601 in the CRC area. The base station may determine the masking position of the identifier based on at least one of the identifier, the purpose of the identifier, and the number of identifiers already set.

The base station can determine the masking position of the identifier according to the identifier. In some embodiments, the base station can determine the masking position of the identifier based on the priority of the identifier. For example, the priority of the identifier may be determined based on the number of transmission frequencies of the identifier. The base station may mask the K identifiers having the high transmission frequency in the frozen bit region, and the other types of identifiers may mask the CRC region. Compared to the C-RNTI used for general data transmission, an identifier allocated when a specific service or operation is required, such as an SPS RNTI or a TPC RNTI, may have a relatively low frequency of control information transmission. Accordingly, the number of pole decodings for decoding one downlink control information by performing CRC masking on the identifiers having a high transmission frequency, such as the C-RNTI, masking the frozen bit regions, and other identifiers, The identifiers can be reduced compared to how they are masked in the frozen area. For another example, the base station can manually set the priority according to each identifier.

On the other hand, in some other embodiments, the base station may determine the location of the masking according to the purpose of the identifier, instead of the transmission frequency number. That is, the BS may mask the identifier in the CRC region in the case of the SPS-related identifier, and may mask the identifier in the frozen bit region in the case of the identifier for the terminal itself. For that embodiment, the control signal 710 of FIG. 7A is described by way of example. The control signal 710 may include a frozen bit region 711, a payload region 713 (e.g., PDCCH payload), and a CRC region 715. The terminal may mask the C-RNTI 721 in the frozen bit region and mask the SPS-RNTI 725 in the CRC region 715. Here, the SPS-RNTI is an identifier (e.g., SPS C-RNTI) for the semi-permanent resource allocation (SPS), and may be an identifier distinguished from the C-RNTI.

In some other embodiments, the base station may determine the location of the masking according to the number of identifiers already set in the terminal. If identifiers equal to or greater than the threshold value are set in the UE, the BS can mask the identifier through the CRC region. Conversely, if identifiers below the threshold are set in the terminal, the base station may mask the identifier through the frozen bit region. For that embodiment, the control signal 710 of FIG. 7B is described by way of example. The control signal 710 may include a frozen bit region 711, a payload region 713, and a CRC region 715. The base station can determine a masking area for a newly allocated identifier (hereinafter, a new identifier). For example, the threshold may be three. If two identifiers 731 are preset in the terminal, the base station may mask the new identifier in the frozen bit area 711. Conversely, if more than four identifiers are set in the terminal, the base station transmits a new identifier to the CRC area 715 . ≪ / RTI >

Since the UE performs blind decoding by the number of identifiers set in the UE, the decoding delay time of the control signal masked in the CRC area is smaller than the control signal masked in the frozen bit area, as the number of identifiers masked in the CRC area increases Can be reduced. On the other hand, the identifiers masked in the frozen bit region can be distinguished even if they are not entirely demasked, which can be advantageous in terms of power consumption of the terminal. The base station according to various embodiments may adaptively determine an area for masking an identifier in consideration of a power consumption aspect of the UE and a decoding delay time. Hereinafter, masking may be referred to as adaptive masking.

The BS may perform step 605 if the identifier is masked in the CRC area. If the BS does not mask the identifier in the CRC area, the BS can perform step 607. [

In step 605, the base station can perform CRC masking on the identifier.

In step 607, the base station may perform frozen bit masking on the identifier.

In step 609, the base station may transmit a control signal to the terminal. Specifically, the base station may transmit a control signal generated by performing channel coding (e.g., polar coding) on the masked control information to the terminal.

6 to 7B illustrate that the masking area is determined adaptively by the base station, but the terminal can also determine the masking area. The terminal may determine a masking area of an identifier to be set later according to the number of identifiers set in the terminal or the frequency of the set identifiers. In this case, the terminal may determine the masking area without any additional instruction information.

8 illustrates a base station and inter-terminal signaling flow for adaptive masking in accordance with various embodiments of the present disclosure. The base station exemplifies the base station 110 of FIG. The terminal exemplifies the terminal 120 of FIG.

Referring to FIG. 8, in step 801, the BS may assign an identifier to the MS. For example, the base station can allocate an identifier according to a downlink transmission purpose. The terminal may determine a masking area corresponding to the assigned identifier. The base station may determine a masking position for assigning an identifier, i.e., whether the masking region is a CRC region or a frozen bit region. The base station can determine the masking area based on at least one of the number of transmission frequencies of the allocated identifiers, the number of identifiers already assigned to the terminal, and the type of the identifier to be assigned.

In step 803, the BS may transmit to the MS the information on the identifier allocated in step 801 or the indication information indicating the masking area. The information on the identifier may be provided to the UE through a plurality of signaling methods in an indirect manner such as a C-RNTI of the random access procedure, or may be provided to the UE using an explicit RRC message such as an SPS C-RNTI.

The indication information may be provided to the terminal either explicitly or implicitly. In some embodiments, the base station may explicitly transmit indication information to the terminal. For example, the base station may add indication information (e.g., 1 bit) to the RRC message to notify the terminal of the masking region. For example, the 1-bit information may indicate CRC masking if it is '0', frozen bit masking if it is '1', or vice versa. Also, for example, when the base station is RRC-connected, the base station may indicate through the RRC connection reconfiguration message the masking area of the C-RNTI that the UE acquires through the random access procedure. Meanwhile, the indication information may be indicated via a medium access control (CE) control element (CE) or a downlink control information (DCI) in addition to the RRC message.

In some other embodiments, the base station may notify the terminal of the masking region, depending on whether additional indication information is additionally transmitted. In case of not transmitting separate indication information, the base station may mask the identifier in the CRC area according to the default setting. If the UE does not receive any indication information, it can de-mask the CRC region. Conversely, if separate indication information is transmitted, the base station may mask the identifier in the frozen bit area. If the UE receives additional indication information, it can de-mask the frozen bit region.

On the other hand, unlike FIG. 8, when the terminal is able to determine the masking area, that is, when the terminal is configured to set the masking area, the transmission of indication information may be omitted.

In step 805, the base station may configure the control signal. The BS may mask the identifier allocated in step 801 on the masking area indicated in step 803. [ Hereinafter, the same or similar parts to those of step 135 shown in FIG. 1 are omitted from the description. In step 807, the base station can transmit the control signal. Hereinafter, description of the same or similar parts to those of step 137 shown in FIG. 1 will be omitted.

In step 809, the terminal may decode the control signal. When a control signal is received, the UE can demask the control signal while changing the identifier allocated from the BS for each PDCCH candidate. The terminal may perform blind decoding including not only the pre-allocated identifiers but also identifiers allocated in step 803. The terminal can perform demarking on the masking area provided by the instruction information or determined by the terminal in step 803 to obtain the control information of the terminal. According to various embodiments, the terminal may perform polar decoding on the frozen domain. The terminal may perform demarking on the frozen bit region and obtain control information of the terminal when performing polar code decoding. According to various embodiments, the terminal may perform demodulation decoding and then perform demarking in the CRC region to obtain control information of the UE.

9 shows a flow of a base station for partial masking according to various embodiments of the present disclosure. The base station exemplifies the base station 110 of FIG. 9 is a diagram showing a case where frozen bit masking is performed on a bit string (hereinafter referred to as a common bit string) corresponding to a common portion among a plurality of identifiers assigned to a terminal, and a bit string corresponding to a non- A specific bit string) is shown in which the CRC masking is performed. The control signal 1010 of FIG. 10 is described as an example.

Referring to FIG. 9, in step 901, a base station can determine an identifier. The base station can determine a specific identifier among the plurality of identifiers allocated to the terminal according to the transmission purpose. For example, the base station can determine the C-RNTI if it wants to transmit downlink data. For another example, the base station may determine the TPC-RNTI to provide the terminal with a TPC command. For another example, the base station may determine the SPS-RNTI for semi-persistent resource allocation to the terminal.

In step 903, the BS determines whether the bits corresponding to the common part of the bits constituting the bit string of the identifier determined in step 901, that is, the bits that do not correspond to the common part and the common part, Can be identified. Here, the identifier-specific bit string refers to a bit string portion that varies depending on the type of the identifier.

In order to operate the embodiment shown in Fig. 9, the structure of the identifier can be defined. The base station according to various embodiments may set an identifier value to include a common portion of all of the identifiers for the terminal. For example, when allocating an identifier, the base station sets a value for identifying the terminal to a common portion of the identifier, that is, a common bit string, and identifies an identifier for distinguishing the service or control information transmission purpose from the remaining portion, Column.

For that embodiment, the control signal 1010 of FIG. 10 is described by way of example. Referring to FIG. 10, the control signal 1010 may include a frozen bit region 1011, a payload region 1013, and a CRC region 1015. The base station can identify the common bit string 1021 and the identifier-specific bit string 1025 of the identifier 1020. The common bit string 1021 may be a value indicating a terminal. The identifier-specific bit string 1025 may be a value indicating the transmission purpose of the identifier 1020.

In step 905, the base station may perform frozen bit masking on the common bit string, and perform CRC masking on the identifier-specific bit string. The masking in which the identifier is divided into the frozen bit region and the CRC masking region, respectively, can be referred to as partial masking. For example, as shown in FIG. 10, the base station may mask the common partial bit string 1021 in the frozen bit area 1011 and the identifier common bit string 1025 in the CRC area 1015.

In step 907, the base station may generate a control signal. The base station can perform channel coding for the bit strings whose identifiers are masked. Here, the channel coding is channel coding for the downlink control signal and may be polar coding. The base station may perform channel coding and other downlink transmission processing to generate a control signal. The base station can transmit the generated control signal to the terminal.

Although not shown in FIG. 9, the terminal can receive a control signal from the base station. The terminal can determine whether decoding is possible in the case of performing the polar decoding only in the common bit stream. When the common portion corresponds to the identifier of the terminal, the terminal can obtain control information by performing CRC demasking on the remaining portion.

The terminal searches the control information of the UE first by performing demasking on the frozen bit region, and acquires the control information transmission purpose in the CRC demasking step, thereby obtaining the control information of the UE efficiently . The UE can acquire the control information of the UE by performing only one decoding at most once per PDCCH candidate, instead of performing per-identifier decoding for each PDCCH candidate.

In order to operate the embodiment illustrated in FIG. 5D, a masking scheme for distinguishing common control information from UE-specifc control information may be employed in constructing multiple identifiers. Here, the common control information is control information for a set of terminals (set), which may mean control information that is distinguished from the UE-specific control information. For example, the common control information may be cell-specific cell-specific control information or group-specific group-specific control information. The common control information and the UE-specific control information are distinguished from each other and can solve the problem that some UEs can not obtain the common control information by using both the identifier for common control information and the identifier for UE-specific control information.

According to various embodiments, multiple identifiers may be configured based on identifiers for common control information. A common control information identifier for a terminal set is set in the terminal, and in a resource region in which the control information is allocated, the base station constructs multiple identifiers by excluding identifiers for the UE-specific control information and only identifiers for common control information ≪ / RTI > In other words, when an identifier (hereinafter referred to as a U identifier) for UE-specific control information and an identifier (hereinafter referred to as C identifier) for common specific control information are all set in the terminal, the base station can configure multiple identifiers have. For example, if three C identifiers and one U identifiers are set in the terminal, the base station can construct multiple identifiers through three C identifiers. In one example, the base station may configure multiple identifiers through at least two of the three identifiers.

As described above, the identifier corresponding to the common control information can perform masking (hereinafter referred to as common masking) on the common control information by using the characteristics commonly applied to all the terminals, unlike the UE-specific control information . The base station can determine whether to mask an identifier corresponding to common control information in an area (e.g., frozen bit area or CRC area), when to mask it, whether to mask using multiple identifiers, and the like.

11 illustrates an example of common masking, in accordance with various embodiments of the present disclosure. The terminal may mask the common control information with multiple identifiers.

11, the control signal 1110 may include a frozen bit region 1111, a payload region 1113, and a CRC region 1115. The base station can determine (or generate) multiple identifiers using only the identifiers corresponding to the common control information. The multiple identifiers 1120 that are masked in the frozen bit area 1111 may be comprised of a second identifier (e.g., SI-RNTI X2) 1132 and a third identifier (e.g., P-RNTI X3) 1133 that are C identifiers. In the CRC area, in addition to the C identifier, a first identifier (e.g., C-RNTI) X1 that is a U identifier may be masked. Each of the terminals in the terminal set corresponding to the C identifier can distinguish both the common control information and the UE-specific control information by one pole decoding and a plurality of CRC checking procedures.

Figure 12 illustrates another example of a common masking, in accordance with various embodiments of the present disclosure. The base station can perform masking according to resources for control information. Resources can be time resources

Referring to FIG. 12, the control signal 1210 may include a frozen bit region 1211, a payload region 1213, and a CRC region 1215. When the section in which the control information is transmitted is determined, the identifier corresponding to the control information can be masked in the specific area. For example, the BS may transmit a control signal by masking the SI-RNTI instead of the multiple identifiers in the frozen bit region from the start time to the end time of the SI (system information) window. The UE can distinguish the common control information from the UE-specific control information from the received control signal through one polar decoding and a plurality of CRC check procedures. The above embodiment can be applied not only to the SI-RNTI but also to the identifier corresponding to the control information and the control information transmitted in common to the terminal aggregate with the time window, that is, the C identifier. When a plurality of identifiers are set for common control information, each common control information and a transmission interval of the identifier may be set to be mutually avoided. In other words, the windows corresponding to each common control information can be set so as not to overlap each other.

13 shows a flow of a base station for common masking in accordance with various embodiments of the present disclosure.

In step 1301, the BS determines whether the transmission time point of the control signal is within the transmission window of the common control information. The BS may perform step 1303 when the transmission time point of the control signal is within the transmission window. Conversely, if the transmission time point of the control signal is not the transmission window, the base station can perform step 1305. [

In step 1303, the base station can determine an identifier corresponding to the common control information. The base station may determine an identifier corresponding to the common information to transmit common control information within the transmission window. In the time window in which the common control information can be transmitted, the frozen bit area can be masked with only the identifier for the common control information instead of the multiple identifiers. For example, common control information on system information transmitted to all terminals may be masked with SI-RNTI. The control information (e.g., system information) may be transmitted within the SI window time interval set by the base station.

In step 1305, the base station can determine multiple identifiers. The base station can determine multiple identifiers based on at least two of the identifiers set in the terminal. According to various embodiments, the base station may determine multiple identifiers based on C identifiers corresponding to common control information. C identifiers are used to configure multiple identifiers, it is possible to solve the problem that some terminals do not receive control information.

In step 1307, the base station may mask the determined identifier in the frozen bit area. The base station may mask an identifier or multiple identifiers corresponding to the common control information in the frozen bit area. By masking the frozen bit region, the terminal can achieve a steadily reduced decoding complexity through a smaller number of decoding than the CRC region.

The base station may determine at least one identifier for common control information and mask the determined at least one identifier in the frozen bit area, as shown in FIG. Although not shown in FIG. 13, the base station can determine an identifier for the UE-specific control information and mask it in the CRC area. The base station may transmit a control signal including the CRC region and the frozen bit region to the UE.

14 shows a flow of a base station for common masking in accordance with various embodiments of the present disclosure.

Referring to FIG. 14, in step 1401, the BS determines whether the transmission time point of the control signal is within the window of the common control information. Since step 1401 corresponds to step 1301 of FIG. 13, detailed description of step 1401 is omitted.

In step 1403, the base station can determine multiple identifiers. Since step 1403 corresponds to step 1305 of FIG. 13, a detailed description of step 1403 is omitted.

In step 1405, the base station may mask multiple identifiers in the frozen bit region. Since step 1405 corresponds to step 1307 of FIG. 13, a detailed description of step 1405 is omitted.

13, when the base station is in the transmission window of the common control information at the transmission time of the control signal, that is, in the time window in which the common control information can be transmitted, the base station masks the control information only in the CRC region without masking the frozen bit region The masking area can be reduced. The base station may mask the UE-specific control information, mask the common control information, or mask the UE-specific control information and the common control information in the CRC area.

The base station can determine multiple identifiers for common control information and mask the determined multiple identifiers in the frozen bit area, as shown in FIG. Although not shown in FIG. 14, the base station can determine an identifier for the UE-specific control information and mask it in the CRC area. It goes without saying that the base station can mask the common control information masked in the frozen bit region and other common control information in the CRC region. The base station may transmit a control signal including the CRC region and the frozen bit region to the UE.

Meanwhile, although the SI-RNTI, the P-RNTI, and the C-RNTI are used in the above embodiments, the present invention is not limited thereto. In the above embodiments, the SI-RNTI or the P-RNTI is set as the common control information, that is, the identifier commonly set in the terminal group, as the C-RNTI However, the present invention is not limited thereto. Other identifiers such as SP-C-RNTI, RA-RNTI, TC-RNTI in addition to SI-RNTI, P-RNTI and C-RNTI may be used for masking according to various embodiments of the present disclosure.

According to various embodiments, the terminal may mask the identifier for the terminal in the masking region. The masking region may include a frozen bit region for polar codes and a CRC region for CRC. 1 to 10, the length of the identifier of the terminal and the length of the masking area (the length of the CRC area, the length of the frozen bit area, or the length of the CRC area and the frozen bit area) are different from each other, (E.g., an extended identifier) so that the identifier of the terminal corresponds to the length of the masking area. The base station can determine the masking area based on at least one of the type of the identifier to allocate, the transmission purpose according to the identifier, the transmission frequency of the identifier, and the priority of the identifier. The decoding efficiency of the terminal can be increased by adaptively selecting the frozen bit area or the CRC area as a masking area, or by masking a part of the identifier in the frozen bit area and masking the other part in the CRC area.

Meanwhile, although an example has been described in which the identifier for the terminal is extended to correspond to the length of the masking region through the above-described embodiments, the present invention is not limited thereto. That is, even if the length of the identifier for the terminal is longer than the length of the masking area, the base station may convert the identifier for the terminal into the reduced identifier and mask the reduced identifier in the masking area through the mapping function.

Methods according to the claims of the present disclosure or the embodiments described in the specification may be implemented in hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored on a computer-readable storage medium are configured for execution by one or more processors in an electronic device. The one or more programs include instructions that cause the electronic device to perform the methods in accordance with the embodiments of the present disclosure or the claims of the present disclosure.

Such programs (software modules, software) may be stored in a computer readable medium such as a random access memory, a non-volatile memory including flash memory, a read only memory (ROM), an electrically erasable programmable ROM but are not limited to, electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc-ROM (CD-ROM), digital versatile discs An optical storage device, or a magnetic cassette. Or a combination of some or all of these. In addition, a plurality of constituent memories may be included.

The program may also be stored on a communication network, such as the Internet, an Intranet, a local area network (LAN), a wide area network (WAN), a communication network such as a storage area network (SAN) And can be stored in an attachable storage device that can be accessed. Such a storage device may be connected to an apparatus performing an embodiment of the present disclosure via an external port. Further, a separate storage device on the communication network may be connected to an apparatus performing the embodiments of the present disclosure.

In the specific embodiments of the present disclosure described above, the elements included in the disclosure have been expressed singular or plural, in accordance with the specific embodiments shown. It should be understood, however, that the singular or plural representations are selected appropriately according to the situations presented for the convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, And may be composed of a plurality of elements even if they are expressed.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present disclosure should not be limited to the embodiments described, but should be determined by the scope of the appended claims, as well as the appended claims.

Claims (20)

In a wireless communication system, in a method of operating a base station,
Comprising the steps of: masking an identifier for a terminal in at least one of a frozen bit region and a cyclic redundancy check (CRC) region to form a control signal;
And transmitting the control signal to the terminal,
Wherein the length of the identifier is less than the length of the CRC region.
The method of claim 1, wherein the step of configuring the control signal comprises:
Generating an extension identifier having a length equal to the length of the CRC area from the identifier;
And masking the extended identifier in the CRC region.
The method of claim 1, wherein the step of configuring the control signal comprises:
Determining whether the identifier is masked in the frozen bit region or in the CRC region based on the number of identifiers assigned to the terminal.
The method according to claim 1,
Further comprising the step of transmitting to the terminal indication information indicating whether the identifier is masked in the frozen bit area or in the CRC area.
The method of claim 1, wherein the step of configuring the control signal comprises:
Masking the frozen bit region with a first portion of the identifier common to a plurality of identifiers for the terminal;
And masking the CRC region with a second portion of the identifier that is not common with a plurality of identifiers for the terminal.
A method of operating a terminal in a wireless communication system,
Receiving a control signal from a base station;
Demasking at least one of a frozen bit region and a cyclic redundancy check (CRC) region of the control signal using an identifier for the mobile station to obtain control information for the mobile station, Including,
Wherein the length of the identifier is less than the length of the CRC region.
The method of claim 6, wherein the step of acquiring control information of the terminal comprises:
Generating an extension identifier having a length equal to the length of the CRC area from the identifier;
And de-masking the extended identifier in the CRC region.
The method of claim 6, wherein the step of acquiring control information of the terminal comprises:
Determining whether the identifier is masked in the frozen bit region or in the CRC region based on the number of identifiers assigned to the terminal.
The method of claim 6,
Further comprising receiving from the base station indication information to indicate whether the identifier is masked in the frozen bit region or in the CRC region.
The method of claim 6, wherein the step of acquiring control information of the terminal comprises:
Masking the frozen bit region using a first portion of the identifier common to a plurality of identifiers for the terminal;
Masking the CRC region using a second portion of the identifier that is not common with a plurality of identifiers for the terminal.
In a wireless communication system, in an apparatus of a base station,
At least one processor,
And at least one transceiver operably coupled to the at least one processor,
Wherein the at least one processor is configured to mask the identifier for the terminal to at least one of a frozen bit region or a cyclic redundancy check (CRC) region to constitute a control signal,
Wherein the at least one transceiver is configured to transmit the control signal to the terminal,
Wherein the length of the identifier is less than the length of the CRC region.
12. The system of claim 11, wherein the at least one processor is configured to:
Generating an extension identifier having a length equal to the length of the CRC area from the identifier,
And mask the extension identifier in the CRC region.
12. The system of claim 11, wherein the at least one processor is configured to:
And determine whether the identifier is masked in the frozen bit region or in the CRC region, based on the number of identifiers assigned to the terminal.
12. The system of claim 11, wherein the at least one transceiver comprises:
And transmit indication information to the terminal indicating whether the identifier is masked in the frozen bit region or in the CRC region.
12. The system of claim 11, wherein the at least one processor is configured to:
Wherein a first portion of the identifier common to a plurality of identifiers for the terminal is masked in the frozen bit region,
And wherein the second portion of the identifier that is not common to the plurality of identifiers for the terminal is configured to mask in the CRC region.
In a wireless communication system, in an apparatus of a terminal,
At least one processor,
And at least one transceiver operably coupled to the at least one processor,
Wherein the at least one transceiver is configured to receive a control signal from a base station,
Wherein the at least one processor demaskes at least one of a frozen bit region or a cyclic redundancy check (CRC) region of the control signal using an identifier for the terminal, And to acquire control information,
Wherein the length of the identifier is less than the length of the CRC region.
17. The apparatus of claim 16, wherein the at least one processor is further configured to:
Generating an extension identifier having a length equal to the length of the CRC area from the identifier,
And demask the extension identifier in the CRC region.
17. The apparatus of claim 16, wherein the at least one processor is further configured to:
And determine whether the identifier is masked in the frozen bit region or in the CRC region, based on the number of identifiers assigned to the terminal.
17. The system of claim 16, wherein the at least one transceiver comprises:
Wherein the identifier is further configured to receive indication information from the base station to indicate whether the identifier is masked in the frozen bit region or in the CRC region.
17. The apparatus of claim 16, wherein the at least one processor is further configured to:
Masking the frozen bit region using a first portion of the identifier common to a plurality of identifiers for the terminal,
And to demask the CRC region using a second portion of the identifier that is not common with a plurality of identifiers for the terminal.

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