Method and apparatus for adapting bandwidth of terminal in wireless communication system

Abstract

A method and apparatus for adapting the bandwidth of a terminal in a wireless communication system are provided. The method includes: sending information about the bandwidth adaptation capability of the terminal to a base station (BS); receiving a bandwidth adaptation command from the BS, the bandwidth adaptation command requesting adaptation of bandwidth corresponding to the bandwidth adaptation capability of the terminal; and adapting the bandwidth of the terminal at at least one symbol position in a unit time period of a subframe based on the received bandwidth adaptation command.

Description

[0001] This application is a divisional application of PCT patent application filed on August 16, 2018, with application number 201880052828.8 and entitled "Method and apparatus for adapting the bandwidth of a terminal in a wireless communication system". Technical Field

[0002] This disclosure relates to wireless communication systems. More specifically, this disclosure relates to methods and apparatus for adapting the bandwidth of a terminal in a wireless communication system. Background Technology

[0003] To meet the growing demand for wireless data traffic following the commercialization of fourth-generation (4G) communication systems, efforts are underway to develop fifth-generation (5G) (or new radio (NR)) systems or pre-5G systems that upgrade from 4G systems. Thus, 5G or pre-5G systems are referred to as "super-4G network" systems or "post-LTE (post-Long Term Evolution)" systems.

[0004] To achieve higher data rates, the implementation of 5G systems in millimeter-wave (mm Wave) bands (e.g., the 60 GHz band) is being considered. To reduce path loss and increase the propagation distance of radio waves in the mm Wave band, beamforming, massive MIMO, full-size MIMO (FD-MIMO), array antennas, analog beamforming, and large antenna technologies for 5G systems are under discussion.

[0005] To enhance system networks, for example, Evolved Small Cell, Advanced Small Cell, Cloud Radio Access Network (Cloud RAN), Ultra-Dense Network, Device-to-Device (D2D) Communication, Wireless Backhaul, Mobile Network, Cooperative Communication, Cooperative Multipoint (CoMP), and Interference Cancellation Technologies are being developed for 5G systems.

[0006] In addition, advanced coding and modulation (ACM) technologies for 5G systems (such as hybrid frequency shift keying (FSK) and quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC)) and advanced access technologies (such as filter bank multiple carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA)) are being developed.

[0007] The above information is presented as background information and is intended to help understand this disclosure. No determination or assertion is made as to whether any of the above content can be used as prior art with respect to this disclosure. Summary of the Invention

[0008] Technical issues

[0009] This disclosure provides a method and apparatus for adjusting the bandwidth of a terminal, enabling the transmission and reception of signals between a base station and the terminal through the bandwidth of at least some frequency bands in the entire frequency band of the wireless communication system.

[0010] Technical solution

[0011] A method and apparatus for adapting the bandwidth of a terminal in a wireless communication system are provided. The method includes: sending information about the bandwidth adaptation capability of the terminal to a base station (BS); receiving a bandwidth adaptation command from the BS, the bandwidth adaptation command requesting adaptation of bandwidth corresponding to the bandwidth adaptation capability of the terminal; and adapting the bandwidth of the terminal at at least one symbol position in a unit time period of a subframe based on the received bandwidth adaptation command. Attached Figure Description

[0012] The above and other aspects, features, and advantages of certain embodiments of this disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, wherein:

[0013] Figure 1 This is a diagram illustrating the basic structure of a time-frequency resource region corresponding to a radio resource region of a wireless communication system based on a cyclic prefix (CP)-orthogonal frequency division multiplexing (OFDM) or a single carrier (SC)-frequency division multiple access (FDMA) according to an embodiment of the present disclosure;

[0014] Figure 2 , Figure 3 and Figure 4 This is a diagram used to describe the extended frame structure of a fifth-generation communication (5G) system according to various embodiments of the present disclosure;

[0015] Figure 5 This is a diagram used to describe the bandwidth allocated to a terminal according to embodiments of this disclosure;

[0016] Figure 6 This is a diagram used to describe the bandwidth allocated to a terminal according to embodiments of this disclosure;

[0017] Figure 7 This is a diagram illustrating a method for adapting the bandwidth of a terminal according to embodiments of the present disclosure;

[0018] Figure 8 This is a diagram illustrating a method performed by a terminal to pre-adapt bandwidth before initiating a bandwidth transition, according to an embodiment of the present disclosure;

[0019] Figure 9 This is a diagram illustrating a method performed by a terminal according to an embodiment of the present disclosure for adapting bandwidth after the start of a bandwidth transition;

[0020] Figure 10This is a diagram illustrating a method performed by a terminal according to embodiments of the present disclosure for adapting bandwidth in a time slot structure including downlink (DL) time slots and uplink (UL) time slots;

[0021] Figure 11 This is a diagram illustrating a method for adapting bandwidth based on non-zero power (NZP)-channel state information (CSI)-reference signal (RS) according to embodiments of the present disclosure;

[0022] Figure 12 This is a diagram illustrating a method for adapting the frequency band of a terminal based on zero power (ZP)-RS or guard period (GP) according to embodiments of the present disclosure;

[0023] Figure 13 This is a diagram illustrating a method for adapting the bandwidth of a terminal by using Physical Downlink Control Channel (PDCCH) OFDM symbols according to embodiments of the present disclosure;

[0024] Figure 14 This is a flowchart of a method for adapting bandwidth performed by a terminal according to an embodiment of the present disclosure;

[0025] Figure 15 This is a flowchart of a method for adapting bandwidth performed by a terminal according to another embodiment of the present disclosure;

[0026] Figure 16 This is a flowchart of a method for adapting the bandwidth of a terminal, performed by a base station (BS) according to an embodiment of the present disclosure;

[0027] Figure 17 This is a flowchart of a method for adapting terminal bandwidth performed by a BS according to an embodiment of the present disclosure;

[0028] Figure 18 This is a block diagram of a terminal according to an embodiment of the present disclosure; and

[0029] Figure 19 This is a block diagram of a BS according to an embodiment of the present disclosure.

[0030] Throughout the accompanying drawings, it should be noted that the same reference numerals are used to denote the same or similar elements, features, and structures. Detailed Implementation

[0031] Best way to carry out the invention

[0032] The aspects of this disclosure will at least address the aforementioned problems and / or disadvantages, and provide at least the following advantages. Therefore, one aspect of this disclosure is to provide a method and apparatus for adapting the bandwidth of a terminal to allow signal transmission and reception between a base station (BS) and a terminal via bandwidth encompassing at least some of the frequency bands of the entire wireless communication system.

[0033] Other aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the embodiments presented.

[0034] According to one aspect of this disclosure, a method for adapting bandwidth for transmitting and receiving signals, performed by a terminal, is provided. The method includes: sending information about the terminal's bandwidth adaptation capability to a base station (BS); receiving a bandwidth adaptation command from the BS, the bandwidth adaptation command requesting adaptation of bandwidth corresponding to the terminal's bandwidth adaptation capability; and adapting the terminal's bandwidth at at least one symbol position within a unit time period of a subframe based on the received bandwidth adaptation command.

[0035] According to another aspect of this disclosure, a method is provided for adapting bandwidth for transmitting signals to and receiving signals from a terminal, performed by a BS. The method includes: receiving information about the bandwidth adaptation capability of the terminal; determining a bandwidth corresponding to the terminal's bandwidth adaptation capability based on the information about the terminal's bandwidth adaptation capability; and sending a bandwidth adaptation command to the terminal, the bandwidth adaptation command being used to request adaptation to the bandwidth determined by the BS.

[0036] According to another aspect of this disclosure, a terminal is provided for adapting bandwidth for transmitting and receiving signals. The terminal includes: a transceiver configured to transmit information about the terminal's bandwidth adaptation capability to a base station (BS) and receive a bandwidth adaptation command from the BS, the bandwidth adaptation command requesting adaptation to bandwidth corresponding to the terminal's bandwidth adaptation capability; a memory configured to store information about the terminal's bandwidth adaptation capability; and a processor configured to adapt the terminal's bandwidth at at least one symbol position within a unit time period of a subframe based on the received bandwidth adaptation command.

[0037] According to another aspect of this disclosure, a base station (BS) is provided for adapting bandwidth for transmitting signals to and receiving signals from a terminal. The BS includes: a transceiver configured to receive information about the bandwidth adaptation capability of a terminal; a memory configured to store the information about the bandwidth adaptation capability of the terminal; and a processor configured to determine a bandwidth corresponding to the bandwidth adaptation capability of the terminal based on the information about the bandwidth adaptation capability of the terminal, wherein the transceiver is further configured to send a bandwidth adaptation command to the terminal for requesting adaptation to the bandwidth determined by the BS.

[0038] Other aspects, advantages and distinctive features of this disclosure will become apparent to those skilled in the art from the following detailed description, which discloses various embodiments of the disclosure in conjunction with the accompanying drawings.

[0039] Implementation of the invention

[0040] The following description, with reference to the accompanying drawings, is provided to aid in a full understanding of the various embodiments of this disclosure as defined by the claims and their equivalents. It includes various specific details to aid understanding, but these details are to be considered exemplary only. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of this disclosure. Additionally, for clarity and brevity, descriptions of well-known functions and configurations may be omitted.

[0041] The terms and words used in the following description and claims are not limited to their literal meaning, but are used solely by the inventors to enable a clear and consistent understanding of this disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of this disclosure is for illustrative purposes only and not for limiting the disclosure as defined by the appended claims and their equivalents.

[0042] It should be understood that the singular forms of “one” and “the” include plural objects unless the context explicitly indicates otherwise. Thus, for example, referring to “part surface” includes referring to one or more such surfaces.

[0043] The terms used herein are selected in consideration of the functionality obtained according to the embodiments, and may be replaced with other terms based on the intent, practice, or emergence of new technologies by those skilled in the art. Therefore, it should be noted that these terms are interpreted in light of the entirety of this specification. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. When a statement such as "at least one" precedes a string of elements, it modifies the entire string of elements without modifying the individual elements within that string.

[0044] Techniques for receiving broadcast information from a base station (BS) by a terminal in a wireless communication system will now be described. This disclosure relates to communication technologies for integrating Internet of Things (IoT) technologies with fifth-generation (5G) communication systems, an improvement over fourth-generation (4G) systems, to achieve higher data rates, and to systems using these communication technologies. This disclosure is applicable to smart services based on 5G communication technologies and IoT-related technologies (e.g., smart homes, smart buildings, smart cities, smart or connected cars, healthcare, digital education, retail trade, security and safety services).

[0045] As used herein, for ease of explanation, terms for specifying broadcast information, terms for specifying control information, terms for specifying coverage, terms for specifying state changes (e.g., events), terms for specifying network entities, terms for specifying messages, terms for specifying components of a device, etc., are provided by way of example. Therefore, this disclosure is not limited to the terms described below, and other terms with technically equivalent meanings may also be used.

[0046] In the following description, for ease of explanation, some terms and names defined by the 3GPP Long Term Evolution (LTE) standard may be used. However, this disclosure is not limited to these terms and names, and applies equally to systems based on other standards.

[0047] Wireless communication systems providing voice-based services are being developed as broadband wireless communication systems that provide high-speed and high-quality packet data services, based on communication standards such as High-Speed ​​Packet Access (HSPA), LTE or Evolved Universal Terrestrial Radio Access (E-UTRA), Advanced LTE (LTE-A), 3GPP's LTE-Pro, 3GPP2's High-Speed ​​Packet Data (HRPD) and Ultra Mobile Broadband (UMB), and the Institute of Electrical and Electronics Engineers' (IEEE) 802.16e.

[0048] As a representative example of a broadband wireless communication system, the LTE system employs Orthogonal Frequency Division Multiplexing (OFDM) for the downlink and Single Carrier (SC)-Frequency Division Multiple Access (FDMA) for the uplink. The uplink (UL) refers to the radio link used to transmit data or control signals from a terminal (e.g., a User Equipment (UE) or Mobile Station (MS)) to a Base Station (BS) (or Evolved Node B (eNB)), while the downlink (DL) refers to the radio link used to transmit data or control signals from the BS to the terminal. These multiple access schemes typically distinguish between different users' data or control information by allocating time-frequency resources to users' data or control information to prevent overlap, i.e., establishing orthogonality between them.

[0049] As a post-LTE system, 5G (or New Radio (NR)) systems need to support services that reflect and meet the diverse requirements of users, service providers, and others. Services considered for 5G systems include enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low-latency communications (URLLC).

[0050] Compared to the data rates supported by LTE, LTE-A, or LTE-Pro, eMBB service aims to provide enhanced data rates. For example, considering a single BS, eMBB service in a 5G system needs to provide a peak data rate of 20 gigabits per second (Gbps) for DL ​​and 10 Gbps for UL. Simultaneously, increased user-aware data rates are required. To meet these requirements, enhanced transceiver technologies, including enhanced multiple-input multiple-output (MIMO), are needed. The data rates required by 5G systems can be met by using bandwidths wider than 20 megahertz (MHz) in the 3 to 6 GHz or higher frequency bands (replacing the current 2 GHz band used for LTE).

[0051] Meanwhile, mMTC services in 5G systems are considered to support applications such as IoT. For example, mMTC services need to support a large number of users within a cell, enhance terminal coverage, increase battery life, and reduce user costs, thereby effectively providing IoT services. IoT services provide communication capabilities by using various sensors attached to various devices, thus requiring support for a large number of terminals within a cell (e.g., 1,000,000 terminals / km²). Furthermore, due to the nature of the service, mMTC-enabled terminals may be located in shaded areas, such as building basements, therefore mMTC services require a wider coverage area compared to other services provided by 5G systems. mMTC-enabled terminals need to be inexpensive and have batteries that cannot be frequently replaced, thus requiring long battery life.

[0052] Finally, URLLC (URLLC) services are mission-critical cellular-based wireless communication services used for remote control of robots or machinery, industrial automation, drones, telemedicine, emergency alarms, etc., requiring ultra-low latency and ultra-reliable communication. For example, URLLC services need to meet an air interface latency of less than 0.5 milliseconds (ms) and a packet error rate equal to or less than 10⁻⁵. Therefore, for URLLC services, compared to other services, 5G systems need to provide a smaller Transmission Time Interval (TTI) and simultaneously allocate wider resources in the frequency band.

[0053] The services considered in 5G systems need to be integrated and provided based on a single framework. In other words, for effective resource management and control, services may not operate independently, but may be controlled and provided as a whole by a single system.

[0054] The frame structures of LTE, LTE-A, and 5G systems will be described below with reference to the accompanying drawings, followed by a description of the design direction for 5G systems.

[0055] Figure 1 This is a diagram illustrating the basic structure of a time-frequency resource region corresponding to a radio resource region of a wireless communication system based on Cyclic Prefix (CP)-OFDM or SC-FDMA, according to an embodiment of the present disclosure.

[0056] In this document, wireless communication systems based on CP-OFDM or SC-FDMA may include at least one of LTE, LTE-A, and 5G systems. However, the above systems are merely examples, and wireless communication systems based on CP-OFDM or SC-FDMA are not limited thereto.

[0057] refer to Figure 1In the time-frequency resource area, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. In this specification, the wireless link used to transmit data or control signals from the terminal to the BS will be described as UL, and the wireless link used to transmit data or control signals from the BS to the terminal will be described as DL.

[0058] The smallest transmission unit in the time domain of LTE, LTE-A, and 5G systems is an OFDM symbol or an SC-FDMA symbol, and N symb Each symbol 105 can be configured with time slot 115. In LTE and LTE-A systems, each of the two time slots, comprising seven symbols, can be configured with subframe 140.

[0059] 5G systems can support two time-slot structures, such as a time-slot structure and a micro-time-slot (or non-time-slot) structure. In the time-slot structure of a 5G system, N symb It can be set to either 7 or 14. In the micro-timeslot structure of 5G systems, N symb It can be set to one of 1, 2, 3, 4, 5, 6, and 7.

[0060] In LTE and LTE-A systems, the length of a time slot is fixed at 0.5 ms, and the length of subframe 140 is fixed at 1.0 ms. However, in 5G systems, the length of a time slot or micro-time slot structure can be flexibly varied according to the subcarrier spacing. In LTE and LTE-A systems, radio frame 135 is a time-domain unit comprising 10 subframes. The smallest transmission unit in the frequency domain of LTE and LTE-A systems is a 15 kHz subcarrier (subcarrier spacing = 15 kHz), and the bandwidth of the entire transmission frequency band of the system can correspond to N. BW All of the 110 subcarriers. See below for reference. Figures 2 to 4 Describe in detail the flexible extended frame structure of the 5G system.

[0061] The basic unit of resources in the time-frequency domain is a resource element (RE) 130, and an RE 130 can be indicated by at least one of an OFDM symbol index, an SC-FDMA symbol index, and a subcarrier index. A resource block (RB) (or physical resource block (PRB)) 120 can be defined in the time domain as N. symb 105 symbols (e.g., N) symb One OFDM symbol or N symb (N SC-FDMA symbols), and is defined as N in the frequency domain. RB RB 120 can include N consecutive subcarriers 125. symb ×N RB RE130.

[0062] The number N corresponding to the number of OFDM symbols can be determined based on the length of the CP added to each symbol. symb This is to prevent interference between symbols. For example, in the case of using ordinary CP, N symb It can be determined to be 7, or N when using extended CP. symb It can be determined to be 6. In order to maintain orthogonality between symbols, the extended CP can be used for systems with long propagation distances compared to the ordinary CP.

[0063] Subcarrier spacing, CP length, etc. are necessary information for OFDM transmission and reception, and proper transmission and reception can only be performed when the BS and the terminal obtain this information as a common value.

[0064] The frame structures described above for LTE and LTE-A systems are designed with general voice or data communication in mind and may not be easily extended to meet the diverse services and requirements of 5G systems. Therefore, for 5G systems, a flexible definition and use of frame structures is needed, taking into account various services and requirements.

[0065] Figures 2 to 4 This is a diagram illustrating the extended frame structure of a 5G system according to various embodiments of the present disclosure.

[0066] In the early stages of the future introduction of 5G systems, coexistence or dual-mode operation of 5G systems and existing LTE / LTE-A systems is anticipated. This allows the existing LTE / LTE-A systems to provide stable system operation, while the 5G system can provide enhanced services. Therefore, the extended frame structure of the 5G system needs to include at least the frame structure or parameter set of the LTE / LTE-A system.

[0067] Reference Figures 2 to 4 The example describes subcarrier spacing, CP length, and slot length as necessary parameters for defining the extended frame structure. In 5G systems, the basic time unit for scheduling can be a slot. However, the slot is merely an example, and the basic time unit for scheduling can vary depending on the settings.

[0068] Figure 2 This shows the frame structure or parameter set of a 5G system, which is equal to the frame structure or parameter set of an LTE / LTE-A system. (Refer to...) Figure 2 In frame structure type A, the subcarrier spacing can be 15kHz, 14 symbols can be configured with 1ms time slots, and 12 subcarriers (=180kHz=12Х15kHz) can be configured with PRB.

[0069] Figure 3 Frame structure type B is shown. (Refer to...) Figure 3In frame structure type B, the subcarrier spacing can be 30 kHz, 14 symbols can be configured with 0.5 ms time slots, and 12 subcarriers (= 360 kHz = 12 × 30 kHz) can be configured with PRBs. The subcarrier spacing and PRB size of frame structure type B can be twice that of frame structure type A, and the time slot length and symbol length of frame structure type B can be twice as small as those of frame structure type A.

[0070] Figure 4 Frame structure type C is shown. (Refer to...) Figure 4 In frame structure type C, the subcarrier spacing can be 60 kHz, 14 symbols can be configured with 0.25 ms time slots, and 12 subcarriers (= 720 kHz = 12 × 60 kHz) can be configured with PRBs. The subcarrier spacing and PRB size of frame structure type C can be four times that of frame structure type A, and the time slot length and symbol length of frame structure type C can be four times smaller than the time slot length and symbol length of frame structure type A.

[0071] That is, the above refers to Figures 2 to 4 The frame structure types described can be summarized as follows. According to embodiments, 5G systems can provide high scalability by determining that the necessary parameters of the frame structure type, such as subcarrier spacing, CP length, and slot length, are integer multiples greater than or less than those of other frame structure types.

[0072] Alternatively, a subframe of fixed length 1ms can be defined to represent the reference time unit, regardless of the frame structure type. In this way, a subframe includes one time slot from frame structure type A, two time slots from frame structure type B, and four time slots from frame structure type C.

[0073] The frame structure types A, B, and C described above are merely examples to describe available extended frame structures, and the available extended frame structures according to the embodiments are not limited thereto. According to another example, the subcarrier spacing of the frame structure can be set to 120 kHz or 240 kHz.

[0074] The frame structure types described above can be applied to various scenarios. Considering cell size, frame structure type A can support larger cells compared to frame structure types B and C because a longer CP length can support larger cells. Considering operating frequency band, frame structure type C can support higher operating frequencies compared to frame structure types A and B because a larger subcarrier spacing is more advantageous for recovering phase noise in higher frequency bands. Considering service, frame structure type C is more suitable for URLLC services compared to frame structure types A and B because a shorter subframe length is more conducive to supporting ultra-low latency services such as URLLC.

[0075] The aforementioned frame structure types can be operated as a whole within the system.

[0076] In LTE and LTE-A systems, terminals can report the E-UTRA bands they support using the E-UTRA channel bandwidths defined in Table 1. This means that LTE and LTE-A terminals need to support all channel bandwidths supported by the E-UTRA bands reported by the terminal.

[0077] [Table 1]

[0078] E-UTRA channel bandwidth (in 3GPP TS36.101)

[0079]

[0080]

[0081] In LTE systems, terminals can perform adaptive gain control (AGC) and appropriately adapt the dynamic range of the analog-to-digital converter (ADC) based on cell-specific reference signals (CRS) periodically transmitted within the system bandwidth. Furthermore, in LTE systems, because terminals need to support the entire system bandwidth configurable within the frequency bands they support, and all resources within the system bandwidth can be allocated to the Physical Downlink Shared Channel (PDSCH), terminals do not need to perform radio frequency (RF) retuning within the configured system bandwidth.

[0082] As mentioned above, in 5G systems, to achieve ultra-high-speed data services of several Gbps, it is necessary to consider transmitting and receiving signals in ultra-wide bandwidths ranging from tens to hundreds of MHz or even several GHz. In this case, since power consumption increases proportionally with the transmission and reception bandwidth, it is necessary to effectively manage the power consumption of the terminal or base station (BS) by adapting the transmission and reception bandwidth. In particular, the terminal has a limited battery capacity, so effective power consumption management is essential.

[0083] Therefore, if terminals are forced to support the overall system bandwidth that can be set within a given frequency band in systems such as LTE and LTE-A, it could place a heavy burden on terminals operating in 5G systems. Thus, in order for terminals to operate efficiently in 5G systems, their bandwidth needs to be adapted to support only the bandwidth portion (BWP) narrower than the overall system bandwidth.

[0084] Since the CRS (which is transmitted periodically throughout the system) bandwidth is not present in 5G systems, the standards for terminal AGC and RF retuning may be unclear. To address this issue, the terminal bandwidth adaptation method and apparatus according to this disclosure can provide a standard for performing at least one of terminal AGC and RF retuning. A detailed description of this standard will now be provided.

[0085] Considering the different capabilities of terminals, the wireless communication system according to the embodiments can set one or more BWPs for the entire system bandwidth for each terminal to reduce the power consumption of the terminal. Here, the active BWP among one or more BWPs can be assigned to the PDSCH. In this case, the terminal needs to perform AGC or RF retuning based on the set or active BWP. This disclosure can provide a bandwidth adaptation method for use in situations having the above-mentioned... Figures 2 to 4 In the wireless communication systems with various frame structures, the terminal performs AGC and RF retuning.

[0086] Figure 5 This is a diagram illustrating the bandwidth allocated to a terminal according to embodiments of the present disclosure.

[0087] Reference Figure 5 The BS can configure at least one BWP 510 for the terminal via higher-layer signaling, whereby the BWP 510 includes some of the entire system frequency band (or all carriers) 500. In this case, the BS can set one of the at least one BWP 510 as the active BWP for the terminal via higher-layer signaling or Layer 1 (L1) signaling. Here, when the configured bandwidth is always the same as the active BWP, one of the BWP configuration and activation processes can be omitted.

[0088] When a BWP is activated, the terminal may not need to transmit or receive signals in frequency bands other than the activated BWP. For example, when the BS activates at least one BWP 510 in the entire system frequency band (or all carriers) 500 used by the terminal, the terminal's reception or transmission of signals in frequency bands other than the activated at least one BWP 510 may not be assumed.

[0089] Figure 6 This is a diagram illustrating the bandwidth allocated to a terminal according to embodiments of the present disclosure.

[0090] Reference Figure 6 The BS can configure multiple BWPs 610 and 620 for the terminal via higher-layer signaling, each of the multiple BWPs 610 and 620 including some of the entire system frequency band (or all carriers) 600. For example, the BS can configure at least one of the multiple BWPs 610 and 620 for the terminal, including BWP#1 with a wider bandwidth and BWP#2 with a narrower bandwidth.

[0091] Additionally, the BS can set one of multiple BWPs 610 and 620 as the active BWP via higher-level signaling or LI signaling. (See above regarding...) Figure 5As described, the terminal may not need to transmit or receive via a frequency band other than the active BWP. In this case, since the multiple configured BWPs 610 and 620 correspond to different frequency bands, the BS and the terminal can reduce their power consumption by adapting to the frequency band available for monitoring or transmission within a given time, if necessary.

[0092] According to embodiments of this disclosure, a method for effectively performing AGC or RF retuning for bandwidth adaptation in a 5G system, executed by a BS and a terminal, can be provided. The method for effectively performing AGC or RF retuning for bandwidth adaptation will now be described in detail.

[0093] <Example 1: Terminal Bandwidth Adaptation Based on Transition Time>

[0094] Since the DL and UL transmission bands are determined by the BS, the BS can prepare in advance to change the transmission bands. However, the terminal may not be aware of the transmission band change before the BS instructs it to, and therefore needs to perform some pre-operations for transceiver band adaptation from when the transmission band change is indicated until the transmission band is actually changed.

[0095] One pre-operation is RF retuning. When temporarily limiting the frequency band of an RF device to reduce its power consumption, or when using a low-cost RF device, the terminal may not receive or transmit the entire frequency band at once. Thus, when the frequency band is adapted to a range beyond the currently set transmit / receive band, the terminal can change the transmit / receive band by adjusting the oscillator.

[0096] Additionally, according to the embodiment, since it takes a certain amount of time to perform RF retuning, and the terminal may not send or receive signals during the RF retuning time, this situation can be taken into account when the BS allocates resources.

[0097] Another aspect of the pre-operation is terminal AGC. Reference will now be made to... Figure 7 Provide a description of it.

[0098] Figure 7 This is a diagram illustrating a method for adapting the bandwidth of a terminal according to embodiments of the present disclosure.

[0099] refer to Figure 7 Assume the RF retuning time is 0 and the time slot structure only includes DL time slots. Figure 7 In the embodiments, it is also assumed that time slots #1 710 and #2 715 operate as narrowband A 700, time slots #3 720 and #4 725 to #k-1 730 operate as wideband B 705, and time slots #k 735 and #k+1 740 operate as narrowband A 700.

[0100] Reference Figure 7 The DL control channel 755 can be transmitted in the first part of each time slot, and the DL data channel 760 can be transmitted in the second part after the first part. In this case, when the REs have the same transmit power value, the power value of the signal received by the terminal in time slots 710, 715, 735 and 740 corresponding to the narrowband A 700 and time slots 720, 725 and 730 corresponding to the wideband B 705 can be determined to be proportional to the number of REs included in each frequency band.

[0101] When a base station (BS) sends signals with different power values ​​to a terminal via varying bandwidths, the terminal can receive the signals as analog signals. The terminal can then convert the received analog signals into digital signals using an analog-to-digital converter (ADC). The terminal can then perform subsequent signal processing on the converted digital signals, such as data decoding.

[0102] Because the terminal's ADC has a limited dynamic range, it needs to be refitted based on the power value of the received signal. For example, when the received signal has an average power value of 1, the dynamic range of the terminal's ADC can be adapted to {0~2}. When the average power value of the received signal changes to 10, the dynamic range of the terminal's ADC needs to be adapted to {0~20} based on the average power value of the received signal. When the average power value of the terminal's received signal changes, but the dynamic range of the terminal's ADC remains at {0~2}, all received signals with a power value greater than 2 may be treated as 2. This can lead to quantization errors, which may degrade the terminal's reception performance.

[0103] Not only when the terminal's frequency band changes from narrowband to wideband (e.g., 745), but also when the terminal's frequency band changes from wideband to narrowband (e.g., 750), the dynamic range of the terminal's ADC may need to be adapted.

[0104] The impact of bandwidth adaptation on the terminal can vary depending on the timing at which bandwidth adaptation is performed. Now, refer to... Figure 8 and Figure 9 Provide a description of it.

[0105] Figure 8 This is a diagram illustrating a method performed by a terminal according to an embodiment of the present disclosure for pre-adapting bandwidth before a bandwidth transition begins.

[0106] Reference Figure 8The time slot may include a DL control channel 830, a DL data channel 835, and a guard period (GP) 840. According to an embodiment, the terminal may receive a bandwidth adaptation command 820 in a control channel in time slot #k 810, prior to time slot #k+1 815, where bandwidth A800 is changed. However, time slot #k 810 is merely an example, and the location of the time slot where the bandwidth adaptation command 820 is received is not limited thereto. According to another example, the terminal may receive the bandwidth adaptation command 820 in a control channel in a time slot some time away from time slot #k+1 815, where bandwidth is changed. According to yet another example, the terminal may receive the bandwidth adaptation command 820 via higher-layer signaling such as Radio Resource Control (RRC) signaling or Media Access Control (MAC)-Control Element (CE) signaling.

[0107] The terminal can perform bandwidth adaptation in advance before the start of time slot #k+1 815, in which the bandwidth is transformed. For example, the terminal can perform at least 825 of RF retuning and AGC at at least one symbol position in time slot #k 810 before the start of time slot #k+1 815.

[0108] exist Figure 8 In one embodiment, when the terminal performs at least one of RF retuning and AGC before time slot #k+1 815, in which the bandwidth is changed, the terminal can receive all signals of the changed frequency band from the first symbol of time slot #k+1 815. However, when at least one of RF retuning and AGC is performed at at least 825 in at least one symbol position of time slot #k 810, the terminal may not receive some symbols of time slot #k 810, and it may not be easy to predict or measure the received power value of time slot #k+1 815.

[0109] Figure 9 This is a diagram illustrating a method performed by a terminal, according to an embodiment of the present disclosure, for adapting bandwidth after a bandwidth transition has begun.

[0110] Reference Figure 9 According to an embodiment, the terminal can receive the bandwidth adaptation command 920 in a control channel in time slot #k 910, prior to time slot #k+1 915, where bandwidth A 900 is changed. However, time slot #k 910 is merely an example, and the location of the time slot in which the bandwidth adaptation command 920 is received is not limited thereto. According to another example, the terminal can receive the bandwidth adaptation command 920 in a control channel in a time slot some time away from time slot #k+1 915, where the bandwidth is changed. According to yet another example, the terminal can receive the bandwidth adaptation command 920 via higher-layer signaling such as RRC signaling or MAC CE signaling.

[0111] The terminal can perform bandwidth adaptation after the start of time slot #k+1 915, in which the bandwidth is transformed. For example, after the start of time slot #k+1 915, the terminal can perform RF retuning and at least 925 of AGC at at least one symbol position in time slot #k+1 915.

[0112] exist Figure 9 In one embodiment, when the terminal performs at least one of RF retuning and AGC in time slot #k+1 915 after the bandwidth transition begins, the terminal can receive all signals of the last symbol of time slot #k 910 and can perform bandwidth adaptation by receiving the signal that was changed when the frequency band was changed. However, during the period of bandwidth adaptation, the terminal may not receive some of the initial symbols of time slot #k+1 915 in which the bandwidth is changed. In addition, distortion may occur in certain REs of some initial symbols of time slot #k+1 915.

[0113] As mentioned above Figure 8 and Figure 9 As different problems arise depending on the timing of the frequency band adaptation of the terminal, the BS can support frequency band adaptation based on different methods depending on the timing of the frequency band adaptation.

[0114] exist Figure 8 and Figure 9 In the embodiments described, the bandwidth adaptation method for the terminal has been described assuming a time slot structure including DL time slots (where each DL time slot includes a DL control channel and a DL data channel). However, the time slot structure including DL time slots is merely an example, and the above-described bandwidth adaptation method for the terminal can also be applied to time slot structures including both UL time slots and DL time slots. Reference will now be made to... Figure 10 Provide a description of it.

[0115] Figure 10 This is a diagram illustrating a method performed by a terminal according to embodiments of the present disclosure for adapting bandwidth in a time slot structure that includes both DL and UL time slots.

[0116] Reference Figure 10 The time slot may include a DL control channel 1035, a DL data channel 1040, a guard period (GP) 1045, and a UL control channel 1050. However, the above components are merely examples, and the structure of the time slot is not limited thereto. According to another example, the time slot may further include a UL data channel (not shown). A terminal according to an embodiment may receive a bandwidth adaptation command 1020 in the DL control channel 1035 of time slot #k 1010 or at a symbol in its previous time slot. According to another example, the terminal may receive the bandwidth adaptation command 1020 via higher-layer signaling.

[0117] The above about Figure 8 and Figure 9 The described bandwidth adaptation method can also be applied to time slot structures that include DL and UL time slots. For example, in a first case, the terminal can adapt bandwidth A 1000 at at least symbol position 1025 in time slot #k 1010 before bandwidth A 1000 transitions to bandwidth B 1005 in time slot #k+1 1015. According to another example, in a second case, the terminal can adapt bandwidth A 1000 at at least symbol position 1030 in time slot #k+1 1015 after the bandwidth transition begins.

[0118] <Example 2: Termination Bandwidth Adaptation Based on Non-Zero Power (NZP)-Reference Signal (RS)>

[0119] In the current embodiment, a method for bandwidth adaptation based on NZP-RS to perform at least one of RF retuning and AGC will be described in various cases described in Embodiment 1 above.

[0120] To support AGC at the terminal, the BS, according to an embodiment, may provide the terminal with an RS transmitted in the frequency band to be switched or in a wider frequency band including the frequency band to be switched, either before or after the frequency band adaptation timing. Here, the RS transmitted to support AGC may include known RSs, such as Channel State Information (CSI)-RS, Physical Broadcast Channel (PBCH)-Demodulation Reference Signal (DMRS), Physical Downlink Control Channel (PDCCH)-DMRS, or PDSCH-DMRS. According to another example, a newly defined RS for AGC may be used. For ease of illustration, the RS used to support AGC will be referred to as AGC-RS.

[0121] CSI-RS is the most suitable NZP-RS for use as an AGC-RS. CSI-RS can have variable transmission bandwidth. For example, a wideband CSI-RS can have a full-band bandwidth that a terminal can receive at once, and a partial-band CSI-RS can have the bandwidth of a BWP (Broadband Width-Protected Terminal). In this way, CSI-RS can effectively support bandwidth adaptation for the terminal.

[0122] Furthermore, because CSI-RS has a regular RE pattern, the configuration complexity of the terminal can be reduced when measuring the received power value used for AGC. For example, the RE pattern of CSI-RS can have the same RE spacing within a PRB, or the same RE spacing or RE group spacing within a set frequency band. To accurately perform AGC, it can be assumed that the power value of the antenna port used for AGC-RS transmission is the same as the power value of the antenna port used for PDSCH transmission. According to another example, when the power value of the AGC-RS antenna port differs from the power value of the antenna port used for PDSCH transmission, the BS can notify the terminal of the difference or ratio between them.

[0123] According to the embodiments, the terminal can determine the presence of AGC-RS in at least one of implicit and explicit methods. Reference will now be made to... Figure 8 , Figure 9 and Figure 11 Provide a detailed description.

[0124] - Implicit Mode: When the bandwidth adapted based on the bandwidth adaptation command is greater than or less than the previous bandwidth, the terminal can assume that AGC-RS exists at a preset location and port number. Here, the preset location and port number can have different values ​​depending on the terminal's bandwidth adaptation timing (described in Embodiment 1 above). For example, when the terminal... Figure 8 As shown, when bandwidth adaptation is performed in advance before the start of time slot #k+1 815 where the bandwidth is changed, it is assumed that a single port at the last available AGC-RS OFDM symbol position in time slot #k 810 before the bandwidth change can send AGC-RS through the bandwidth to be changed B 805.

[0125] AGC-RS can be NZP-CSI-RS.

[0126] Figure 11 This is a diagram illustrating a method for adapting bandwidth based on NZP-CSI-RS 1125 according to embodiments of the present disclosure.

[0127] Reference Figure 11 The time slot may include DL control channel 1130 and DL data channel 1135. When the terminal performs bandwidth adaptation in advance according to bandwidth adaptation command 1120 before the start of time slot #k+1 1115 in which bandwidth A1100 is changed, it is assumed that a single port at the last AGC-RS OFDM symbol position of time slot #k 1110 before the bandwidth change can send NZP-CSI-RS 1125 through the bandwidth to be changed B 1105.

[0128] Here, when NZP-CSI-RS 1125 is used as AGC-RS, an example of its mode can be similar to Figure 11 The pattern shown.

[0129] As another example, as mentioned above... Figure 9 As described, when a terminal performs bandwidth adaptation such as RF retuning or AGC after the start of time slot #k+1915 or time slot #k+1115 where the bandwidth is changed, assuming a single port at the first available AGC-RS OFDM symbol location of time slot #k+1915 or time slot #k+1115 where the bandwidth is changed, can transmit AGC-RS through the bandwidth to be changed B905 or bandwidth 1105. When the AGC-RS is NZP-CSI-RS, and when in Figure 9 In one embodiment, when NZP-CSI-RS is transmittable at, for example, the OFDM symbol location of DL control channel 930 in time slot #k+1 915, NZP-CSI-RS can be configured to be transmitted at the OFDM symbol location. If NZP-CSI-RS is transmitted via bandwidth B 905 and thus only transmitted in DL data channel 935 in time slot #k+1 915 where its frequency band is shifted, then assuming a single port at the first available CSI-RS OFDM symbol of DL data channel 935 in time slot #k+1 915, the BS can transmit NZP-CSI-RS via the bandwidth B 905 to be shifted.

[0130] - Explicit Method 1: When it is predicted that the terminal needs to adapt to the bandwidth and that the terminal's AGC needs to be reset due to the bandwidth adaptation, the BS can set an AGC-RS that is notified by a signal from a higher layer or set an aperiodic (Ap)-AGC-RS that is triggered by L1 signaling.

[0131] When a terminal uses periodic (P)-CSI-RS or semi-permanent (SP)-CSI-RS transmitted via higher-layer signaling, it can perform terminal bandwidth adaptation above a certain level only for a certain period of time from when the AGC-RS is transmitted. In this case, when a terminal bandwidth adaptation above a certain level is indicated, the terminal can assume that the latest AGC-RS from the bandwidth transition timing is being transmitted on the bandwidth to be transitioned. Alternatively, when a terminal bandwidth adaptation above a certain level is indicated, it can be assumed that the latest AGC-RS from the bandwidth transition timing is a wideband CSI-RS.

[0132] When a terminal uses an Ap-CSI-RS triggered via L1 signaling as an AGC-RS, since Ap-CSI-RS can be triggered in all time slots, the limitations on the terminal's bandwidth adaptation timing can be reduced compared to using P-CSI-RS or SP-CSI-RS as AGC-RS. When Ap-CSI-RS and a band transition are triggered simultaneously, or when Ap-CSI-RS is triggered in a time slot immediately before or after the terminal's band transition, the terminal can assume that the Ap-CSI-RS is available as an AGC-RS. In this case, by ignoring the initially set CSI-RS OFDM symbol location value similar to the example above, the BS and the terminal can assume that the Ap-CSI-RS used for AGC is transmitted at the available CSI-RS OFDM symbol in the time slot closest to where the band transition occurred. Here, the available CSI-RS OFDM symbol can be determined based on the UL-DL configuration of the time slot.

[0133] - Explicit Method 2: Another example of explicitly setting AGC-RS is using CSI settings. 5G (or NR) systems can support "RS Settings," "CSI Reporting Settings," and "Measurement Settings" to report CSI. A BS can set one or more "RS Settings," "CSI Reporting Settings," and "Measurement Settings" for a terminal. RS Settings can include RS settings for measuring CSI, CSI Reporting Settings can include settings regarding the method for reporting the generated CSI, and Measurement Settings can include information about the relationship (association) between one or more RS Settings and CSI Reporting Settings.

[0134] When a specific RS is used as an AGC-RS, the BS may not connect the CSI reporting settings to the RS. This allows the terminal to determine that the RS is not used for channel state reporting, but rather for AGC.

[0135] In the current embodiment, the explicit and implicit methods described above can be used in combination to set up AGC-RS without mutual exclusion. The frequency band settings or terminal assumptions for AGC-RS generally apply to both explicit and implicit methods.

[0136] <Example 3: Terminal Bandwidth Adaptation Based on Zero Power (ZP)-RS or GP>

[0137] In the current embodiment, reference will be made to Figure 12 Describe a method for adapting the frequency band of a terminal based on ZP-RS or GP.

[0138] Figure 12This is a diagram illustrating a method for adapting the frequency band of a terminal based on ZP-RS or GP according to embodiments of the present disclosure. As described above in Embodiments 1 and 2, when the bandwidth of the terminal is switched to a level higher than a certain level, the terminal can perform RF retuning and AGC.

[0139] Reference Figure 12 The time slots can include DL control channel 1230 and DL data channel 1235. When the terminal's bandwidth is similarly maintained but the terminal's frequency band is changed, because the time slots before and after the bandwidth change have similar received power values, the terminal can perform RF retuning without performing AGC. For example, in Figure 12 In this case, since time slot #k 1210 before the bandwidth transition according to bandwidth adaptation command 1220 in bandwidth A 1200 and time slot #k+1 1215 after the bandwidth transition have similar received power values, AGC is not required, but RF retuning of the terminal may be necessary. In this case, the BS can ensure the RF retuning time of the terminal by performing the operations described below.

[0140] The first method involves setting the ZP-RS in at least one OFDM symbol located at the end of time slot #k 1210 immediately preceding the bandwidth transition. The ZP-RS is the RS used to specify the rate matching of the PDSCH and can share the RE mode with the NZP-CSI-RS. However, the ZP RE mode described above is merely an example, and a new ZP RE mode can be defined based on another example.

[0141] In any time-slot configuration, at least one OFDM symbol can be configured to include only ZP-RS. In P-ZP-RS or semi-permanent (SP)-ZP-RS based operations, terminal band adaptation can be performed in a time slot including P-ZP-RS or SP-ZP-RS. In Ap-ZP-RS based operations, the terminal can configure and trigger ZP-RS 1225 in at least one OFDM symbol at the end of time slot #k 1210 where the band is shifted. In both cases, all REs in the ZP-RS OFDM symbol can be configured for ZP-RS 1225 to ensure the terminal's RF retuning time.

[0142] The second method is based on the UL-DL timeslot structure to ensure the terminal's RF retuning time. The BS can set the GP or UL-related portion (e.g., the UL control channel or UL data channel) to have a longer RF retuning time for the terminal than the time slot #k 1210 immediately preceding the band (width) transition. The terminal can perform RF retuning within the set time. The terminal can perform UL RF retuning after the end of the GP or UL-related portion of timeslot #k 1210 and until the start of the UL-related portion of its subsequent timeslot (i.e., timeslot #k+11215).

[0143] The third method specifies the end of time slot #k 1210 before the bandwidth transition as follows: the distance between the end of time slot #k 1210 before the bandwidth transition and its subsequent time slot (i.e., time slot #k+1 1215) is longer than the terminal's RF retuning time. The subsequent process corresponds to the method described above for ensuring the terminal's RF retuning time based on the UL-DL time slot structure.

[0144] <Example 4: Terminal bandwidth adaptation based on the number of PDCCH OFDM symbols>

[0145] If the terminal is like Figure 9 As shown, if bandwidth adaptation is performed at at least one symbol location after the frequency band transition timing, the terminal can adapt its bandwidth by using the PDCCH OFDM symbol.

[0146] Figure 13 This is a diagram illustrating a method for adapting terminal bandwidth using PDCCH OFDM symbols according to embodiments of the present disclosure.

[0147] In the current embodiment, it is assumed that time slot #k 1310 has bandwidth A 1300 and time slot #k+1 1315 has bandwidth B 1305.

[0148] Reference Figure 13The time slot may include DL control channel 1335 and DL data channel 1340. The DL control channel 1335 in time slot #k 1310, where the terminal's frequency band has not changed compared to previous time slots, may include any number (e.g., 1, 2, or 3) of PDCCH OFDM symbols #1 1325. However, in time slot #k+1 1315, where the bandwidth changes according to bandwidth adaptation command 1320, since 1 or 2 initial OFDM symbols are used to adapt the terminal's bandwidth, the number of PDCCH OFDM symbols #2 1330 can be limited to 2 or 3. In this case, PDCCH OFDM symbols #2 1330 not used to adapt the terminal's bandwidth may not be included in the terminal's control channel element (CCE). The terminal's CCE transmitted at the PDCCH OFDM symbols used to adapt the terminal's bandwidth can be configured to be transmitted only through the frequency domain included in bandwidth A 1300 before the bandwidth change.

[0149] Figure 14 This is a flowchart of a method for adapting bandwidth performed by a terminal according to an embodiment of the present disclosure.

[0150] Reference Figure 14 In operation 1410, the terminal sends information about its bandwidth adaptation capabilities to the BS. This information may include details about the terminal's configurable frequency band or bandwidth range, the adjustable RF range of the oscillator, the receive input range of the ADC, etc. However, the types of information described above are merely examples, and the information regarding the terminal's bandwidth adaptation capabilities is not limited to these.

[0151] In operation 1420, the terminal receives a bandwidth adaptation command from the BS, which requests adaptation to bandwidth corresponding to the terminal's bandwidth adaptation capability. For example, the terminal can receive the bandwidth adaptation command from the BS via L1 retuning or higher-layer signaling.

[0152] According to another embodiment, the terminal can receive time slot format control information and bandwidth adaptation commands from the BS. The time slot format control information may include information about the time slot length and information indicating whether the time slot structure includes both UL time slots and DL time slots.

[0153] In operation 1430, the terminal adapts its bandwidth at at least one symbol position within a unit time period of the subframe based on the received bandwidth adaptation command. Here, the unit time period can be a time slot or a micro-time slot. However, time slots and micro-time slots are merely examples, and the unit time period is not limited to these.

[0154] For example, the terminal can perform at least one of RF retuning and AGC at at least one symbol position within a unit time period of a subframe. Once bandwidth adaptation is complete, the terminal can transmit signals to and receive signals from the BS within the adapted bandwidth.

[0155] In which the bandwidth of the terminal is adapted, at least one symbol position in a unit time period of the subframe can correspond to the above regarding Figures 7 to 13 One of the bandwidth adaptation time periods described.

[0156] According to another embodiment, after the BS detects the terminal and the bandwidth is adapted, operation 1410 can be omitted when the bandwidth is to be adapted again.

[0157] Figure 15 This is a flowchart of a method for adapting bandwidth performed by a terminal according to another embodiment of the present disclosure.

[0158] Reference Figure 15 In Operation 1505, the terminal can send information about its bandwidth adaptation capabilities. For example, the terminal can send information about its bandwidth adaptation capabilities to the BS via terminal capability signaling.

[0159] Operation 1505 corresponds to the above regarding Figure 14 Operation 1410 is described.

[0160] In Operation 1510, the terminal can receive bandwidth adaptation commands and time slot format control information.

[0161] According to another example, the terminal may only receive bandwidth adaptation commands.

[0162] In operation 1515, when a bandwidth adaptation command is received from the BS, the terminal can send a bandwidth adaptation command response to the BS. Here, the terminal can send a bandwidth adaptation command response to notify the BS that the bandwidth adaptation command has been received.

[0163] In Operation 1520, the terminal can determine whether the time slot structure includes both DL time slots and UL time slots based on the time slot format control information.

[0164] In Operation 1525, when it is determined that the time slot structure does not include both DL and UL time slots, the terminal can check the time slot length based on the time slot format control information. Here, the case where the time slot structure does not include both DL and UL time slots can represent the case where the time slot structure only includes DL time slots or only includes UL time slots. Based on the time slot length, the time slot format can be divided into a time slot structure and a micro-time slot structure. A time slot structure can include 7 or 14 OFDM symbols, and a micro-time slot (or non-time slot) structure can include 1, 2, 3, 4, 5, 6, or 7 OFDM symbols. The bandwidth adaptation time can be determined based on the time slot format.

[0165] In Operation 1530, the terminal can complete bandwidth adaptation within a bandwidth adaptation time determined based on a time slot format that does not include both DL and UL time slots.

[0166] In operation 1535, the terminal can complete bandwidth adaptation within a bandwidth adaptation time determined based on a timeslot format that excludes both DL and UL timeslots from the micro timeslot structure. Here, the bandwidth adaptation time can be determined to be twice the bandwidth adaptation time described in operation 1530 above. However, the above bandwidth adaptation time is only an example, and the bandwidth adaptation time is not limited to this.

[0167] In operation 1540, when it is determined that the time slot structure includes both DL time slots and UL time slots, the terminal can check the time slot length based on the time slot format control information.

[0168] In Operation 1545, the terminal can complete bandwidth adaptation within a bandwidth adaptation time determined based on the time slot format, which includes both DL and UL time slots.

[0169] In operation 1550, the terminal can complete bandwidth adaptation within a bandwidth adaptation time determined based on the time slot format of the micro-time slot structure, which includes both DL and UL time slots. Here, the bandwidth adaptation time can be determined to be twice the bandwidth adaptation time described in operation 1545 above. However, the bandwidth adaptation time described above is only an example, and the bandwidth adaptation time is not limited to this.

[0170] In Operation 1555, the terminal can send and receive signals within the adapted bandwidth.

[0171] Figure 16 This is a flowchart of a method for adapting the bandwidth of a terminal, performed by a BS according to an embodiment of the present disclosure.

[0172] Reference Figure 16 In operation 1610, the BS receives information about the terminal's bandwidth adaptation capabilities. For example, the BS can receive information about the terminal's bandwidth adaptation capabilities via terminal capability signaling.

[0173] In operation 1620, the BS determines the bandwidth corresponding to the terminal's bandwidth adaptability based on information about the terminal's bandwidth adaptability. The BS can determine which BWP to activate among at least one BWP that the terminal can adapt to across the entire system frequency band.

[0174] In operation 1630, the BS sends a bandwidth adaptation command to the terminal to request adaptation to the determined bandwidth. Here, the bandwidth adaptation command may include information about the determined bandwidth. The BS may send time slot format control information along with the information about the determined bandwidth to the terminal.

[0175] Figure 17 This is a flowchart of a method for adapting the bandwidth of a terminal, performed by a BS according to an embodiment of the present disclosure.

[0176] Reference Figure 17 In operation 1710, the BS can obtain information about the bandwidth adaptation capabilities of the terminal. For example, the BS can receive information about the bandwidth adaptation capabilities of the terminal via terminal capability signaling. According to another example, when information about the bandwidth adaptation capabilities of at least one terminal is pre-stored, the BS can obtain information about the bandwidth adaptation capabilities of the terminal based on the pre-stored information about bandwidth adaptation capabilities.

[0177] In Operation 1720, the BS can send bandwidth adaptation commands and timeslot format control information to the terminal. However, the sending of bandwidth adaptation commands and timeslot format control information is only an example, and the BS can perform actions as described above. Figure 16 The aforementioned command only sends the bandwidth adaptation command to the terminal.

[0178] In Operation 1730, the BS can obtain a bandwidth adaptation command response from the terminal. When the terminal receives a bandwidth adaptation command, the BS can receive a bandwidth adaptation command response from the terminal.

[0179] In operation 1740, the BS can perform scheduling within the allocated bandwidth. Additionally, the BS can send signals to and receive signals from terminals within the allocated bandwidth based on the scheduling.

[0180] Figure 18 This is a block diagram of a terminal 1800 according to an embodiment of the present disclosure.

[0181] Reference Figure 18 Terminal 1800 may include a transceiver 1810, a processor 1820, and a memory 1830. The transceiver 1810, processor 1820, and memory 1830 of terminal 1800 may operate based on the bandwidth adaptation method of the terminal described in the preceding embodiments. However, the components of terminal 1800 according to the embodiments are not limited to the components described above. According to another embodiment, terminal 1800 may include more or fewer components than those described above. In some cases, transceiver 1810, processor 1820, and memory 1830 may be configured as a single chip.

[0182] Transceiver 1810 can transmit signals to and receive signals from the BS. Here, signals may include control information and data. For this purpose, transceiver 1810 may include: an RF transmitter configured to up-convert and amplify the frequency of the transmitted signal; an RF receiver configured to amplify the received signal with low noise and down-convert the frequency of the received signal, etc. However, the RF transmitter and RF receiver are merely examples, and the components of transceiver 1810 are not limited thereto.

[0183] Transceiver 1810 can receive signals via a radio channel and output the signals to processor 1820, and can also transmit signals output from processor 1820 via a radio channel.

[0184] Processor 1820 can control a series of processes to operate terminal 1800 according to the foregoing embodiments. For example, when at least one bandwidth adaptation command is received from BS via transceiver 1810, processor 1820 can execute the bandwidth adaptation method according to the foregoing embodiments. Then, transceiver 1810 can transmit signals through the adapted frequency band.

[0185] The memory 1830 can store control information or data included in signals obtained by the terminal 1800, and has areas for storing data required for or generated by the control operations of the processor 1820. The memory 1830 can be configured in various forms, such as read-only memory (ROM) and / or random access memory (RAM) and / or hard disk and / or optical disc-ROM (CD-ROM) and / or digital versatile optical disc (DVD).

[0186] Figure 19 This is a block diagram of BS 1900 according to an embodiment of the present disclosure.

[0187] Reference Figure 19 The BS 1900 may include a transceiver 1910, a processor 1920, and a memory 1930. The transceiver 1910, processor 1920, and memory 1930 may operate based on the bandwidth adaptation method of the BS described in the preceding embodiments above. However, the components of the BS 1900 according to the embodiments are not limited to those described above. According to another embodiment, the BS 1900 may include more or fewer components than those described above. In some cases, the transceiver 1910, processor 1920, and memory 1930 may be configured as a single chip.

[0188] Transceiver 1910 can transmit signals to and receive signals from a terminal. These signals may include control information and data. For this purpose, transceiver 1910 may include: an RF transmitter configured to up-convert and amplify the frequency of the transmitted signal; an RF receiver configured to amplify the received signal with low noise and down-convert the frequency of the received signal, etc. However, the RF transmitter and RF receiver are merely examples, and the components of transceiver 1910 are not limited thereto.

[0189] Transceiver 1910 can receive signals via a radio channel and output the signals to processor 1920, and can also transmit signals output from processor 1920 via a radio channel.

[0190] Processor 1920 can control a series of processes to operate BS 1900 according to the foregoing embodiments of this disclosure. For example, processor 1920 can execute at least one of the bandwidth adaptation methods according to the above embodiments. Then, transceiver 1910 can transmit signals to the terminal through the adapted frequency band.

[0191] The memory 1930 can store control information or data included in the signals obtained by the BS 1900, and has areas for storing data required for or generated by the control operations of the processor 1920. The memory 1930 can be configured in various forms, such as ROM and / or RAM and / or hard disk and / or CD-ROM and / or DVD.

[0192] According to embodiments of this disclosure, taking into account the different capabilities of terminals, bandwidth adaptation can be performed to effectively utilize resources for transmitting and receiving signals by setting at least one BWP for the entire system frequency band for each terminal in the wireless communication system.

[0193] It should be understood that the embodiments described herein are to be considered in a descriptive sense only and not for limiting purposes. Those skilled in the art will understand that various changes in form and detail may be made to the embodiments without departing from the scope of this disclosure. For ease of explanation, the embodiments are divided and may be combined as needed. For example, portions of embodiments 1 to 4 may be combined to operate the BS and the terminal.

[0194] Although this disclosure has been shown and described with reference to various embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made therein without departing from the spirit and scope of this disclosure as defined by the appended claims and their equivalents.

Claims

1. A method for a terminal in a wireless communication system, the method comprising: Send information about the bandwidth adaptation capability of the terminal to the base station (BS); Identify the time slot format control information configured by the BS; Receive a bandwidth adaptation command from the BS for requesting bandwidth adaptation; The bandwidth of the terminal is adapted during the bandwidth adaptation time identified based on the time slot format control information and the information about the terminal's bandwidth adaptation capability; as well as Sending signals to or receiving signals from the BS using the appropriate bandwidth; The time slot format control information is associated with the time slot length, and The time slot length, which includes 14 symbols, is configured based on the subcarrier spacing as one of 1ms, 0.5ms, or 0.25ms.

2. The method according to claim 1, wherein, The bandwidth adaptation command is received via Layer 1 signaling.

3. The method according to claim 1, wherein, The bandwidth adaptation includes: Based on the reference signal RS received during the bandwidth adaptation time, the received power value of the signal received by the terminal from the BS is determined; and The dynamic range of the analog-to-digital converter (ADC) of the terminal is determined based on the received power value.

4. The method according to claim 1, wherein, The bandwidth adaptation includes: based on the bandwidth adaptation command, converting a first frequency band, which is pre-set to transmit and receive signals between the terminal and the BS, into a second frequency band.

5. A method for using a base station in a wireless communication system, the method comprising: Receive information about the bandwidth adaptation capability of the terminal from the terminal; Configure time slot format control information for the terminal; Send a bandwidth adaptation command to the terminal to request bandwidth adaptation; as well as After the bandwidth adaptation is performed during the bandwidth adaptation time identified based on the time slot format control information and the information about the bandwidth adaptation capability of the terminal, a signal is sent to or received from the terminal via the adapted bandwidth. The time slot format control information is associated with the time slot length; and The time slot length, which includes 14 symbols, is configured based on the subcarrier spacing as one of 1ms, 0.5ms, or 0.25ms.

6. A terminal, comprising: transceiver, and At least one processor connected to the transceiver, wherein the at least one processor is configured to: Send information about the bandwidth adaptation capability of the terminal to the base station (BS); Identify the time slot format control information configured by the BS; Receive a bandwidth adaptation command from the BS requesting bandwidth adaptation. During the bandwidth adaptation time identified based on the time slot format control information and the information regarding the terminal's bandwidth adaptation capability, the bandwidth of the terminal is adapted; and Sending signals to or receiving signals from the BS using the appropriate bandwidth; The time slot format control information is associated with the time slot length; and The time slot length, which includes 14 symbols, is configured based on the subcarrier spacing as one of 1ms, 0.5ms, or 0.25ms.

7. The terminal according to claim 6, wherein, The bandwidth adaptation command is received via Layer 1 signaling.

8. The terminal according to claim 6, wherein, The at least one processor is further configured to: Based on the reference signal RS received during the bandwidth adaptation time, the received power value of the signal received by the terminal from the BS is determined; and The dynamic range of the analog-to-digital converter (ADC) of the terminal is determined based on the received power value.

9. The terminal according to claim 6, wherein, The at least one processor is further configured to: Based on the bandwidth adaptation command, the first frequency band, which is pre-set to transmit and receive signals between the terminal and the BS, is converted into the second frequency band.

10. A base station, comprising: transceiver, and At least one processor connected to the transceiver, the at least one processor being configured to: Receive information about the bandwidth adaptation capability of the terminal from the terminal; Configure time slot format control information for the terminal; Send a bandwidth adaptation command to the terminal to request bandwidth adaptation, and After bandwidth adaptation is performed during the bandwidth adaptation time identified based on the time slot format control information and the information about the bandwidth adaptation capability of the terminal, a signal is sent to or received from the terminal through the adapted bandwidth. The time slot format control information is associated with the time slot length; and The time slot length, which includes 14 symbols, is configured based on the subcarrier spacing as one of 1ms, 0.5ms, or 0.25ms.

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