CN117651320A

CN117651320A - Terminal and base station operation method in wireless communication system and communication equipment

Info

Publication number: CN117651320A
Application number: CN202311119655.6A
Authority: CN
Inventors: 朴纪炫
Original assignee: KT Corp
Current assignee: KT Corp
Priority date: 2022-09-01
Filing date: 2023-08-31
Publication date: 2024-03-05

Abstract

A method of operating a terminal and a base station in a wireless communication system and a communication device are provided. That is, the terminal receives CSI-RS (channel state information-reference signal) from the base station. Also, after receiving the CSI-RS from the base station, the terminal performs CSI feedback (feedback). A method and apparatus for triggering (trigger) at least one of CSI-RS reception and execution of CSI feedback by DCI (downlink control information) reception including network energy saving related parameter information is provided.

Description

Terminal and base station operation method in wireless communication system and communication equipment

Technical Field

The present invention relates to a method of operating a terminal and a base station in a wireless communication system and a communication device.

Background

With the trend of the age, more and more communication devices need larger communication traffic, and improved wireless broadband communication, i.e., a next generation 5G system, is required compared with the existing LTE system. In such a next generation 5G system called NewRAT, a communication scenario is classified into Enhanced Mobile BroadBand (eMBB)/low latency high reliability communication (Ultra-reliability and low-latency communication, URLLC)/large connectivity internet of things (mtc) and the like.

Wherein, ebbb is a next generation mobile communication scenario with characteristics of high spectral efficiency, high user experience data rate, high peak data rate, etc., URLLC is a next generation mobile communication scenario with characteristics of ultra-reliability, ultra-low latency, ultra-high availability, etc. (e.g., V2X, emergency services, remote control), emtc is a next generation mobile communication scenario with characteristics of low cost, low energy consumption, short packets, mass connectivity (e.g., ioT).

Disclosure of Invention

The disclosure of the present specification aims to provide a signaling method and apparatus for network power saving in a wireless communication system.

The embodiments of the present specification provide a method in which a terminal receives a CSI-RS (channel state information-reference signal) from a base station in a wireless communication system, and the terminal performs CSI feedback (feedback) after receiving the CSI-RS from the base station, wherein at least one of the CSI-RS reception and the CSI feedback is triggered (trigger) by DCI (downlink control information) reception including network energy saving related parameter information.

In addition, an embodiment of the present invention provides a method in which a base station transmits a CSI-RS (channel state information-reference signal) to a terminal in a wireless communication system, and the base station receives CSI feedback (feedback) after transmitting the CSI-RS to the terminal, wherein at least one of the CSI-RS transmission and the CSI feedback reception is triggered (trigger) by DCI (downlink control information) transmission including network energy saving related parameter information.

In addition, an embodiment of the present invention provides a communication apparatus, in a wireless communication system, including: at least one processor; at least one memory storing instructions (instructions) and being operably electrically connectable to the at least one processor; wherein the operations performed based on the execution of the instructions by the at least one processor include: a step of receiving a CSI-RS (channel state information-reference signal) from a base station; and a step of performing CSI feedback (feedback) after receiving the CSI-RS from the base station; wherein at least one of the CSI-RS reception and the execution of the CSI feedback is triggered (trigger) through DCI (downlink control information) transmission including network energy saving related parameter information.

In addition, an embodiment of the present invention provides a base station, in a wireless communication system, including: at least one processor; and at least one memory storing instructions (instructions) and being operably electrically connectable to the at least one processor; wherein the operations performed based on the execution of the instructions by the at least one processor include: transmitting a CSI-RS (channel state information-reference signal); and receiving a CSI feedback (feedback) after transmitting the CSI-RS to the terminal; wherein at least one of the CSI-RS transmission and the CSI feedback is triggered (trigger) by DCI (downlink control information) transmission including network energy saving related parameter information.

The DCI may be transmitted and received through a terminal-specific (reserved) PDCCH (physical downlink control channel).

The network energy saving related parameter information may be in a bitmap (bitmap) form. Also, the network energy saving related parameter information may be set through RRC (radio resource control) layers.

The network energy saving related parameter information may include CSI-RS transmission frequency information.

At least one of the CSI-RS reception and the execution of the CSI feedback may be triggered (trigger) after a given time after the DCI reception. In addition, at least one of the CSI-RS transmission and the CSI feedback reception may be triggered (trigger) after a predetermined time after the DCI transmission.

According to the disclosure of the present specification, through efficient application of signaling (signaling) for a network energy saving function in a wireless communication system, it is possible to prevent an erroneous operation of an original terminal and to realize an optimal operation of a terminal supporting the network energy saving function.

Drawings

Fig. 1 is a diagram illustrating a wireless communication system.

Fig. 2 shows the structure of a radio frame used by NR.

Fig. 3 a-3 c are example diagrams illustrating an example architecture for a wireless communication service.

Fig. 4 shows a slot structure of an NR frame.

Fig. 5 shows an example of subframe types in NR.

Fig. 6 shows the structure of a self-contained slot.

Fig. 7 shows a SSB (Synchronization signal block) structure.

Fig. 8 illustrates CSI-RS and/or CSI-related signaling as applied by the network power saving parameters disclosed herein.

Fig. 9 is a diagram illustrating an example of RRC and DCI configurations disclosed in the present specification.

Fig. 10 illustrates SSB and/or PDSCH transceiving for a legacy (legacy) UE as disclosed in the present specification.

Fig. 11 illustrates an operation method of a terminal of an embodiment of the present specification.

Fig. 12 shows an operation method of the base station of an embodiment of the present specification.

Fig. 13 shows an apparatus according to an embodiment of the present description.

Fig. 14 is a block diagram showing the configuration of a terminal according to an embodiment of the present specification.

Fig. 15 shows a block diagram of a processor implementing the disclosure of the present specification.

Fig. 16 is a block diagram showing in detail a transceiver of the first device shown in fig. 13 or a transceiver portion of the device shown in fig. 14.

Detailed Description

It should be noted that the technical terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the content of the present specification. In addition, unless otherwise defined as a different meaning in the present invention, technical terms used in the present specification should be interpreted as meaning commonly understood by one of ordinary skill in the art to which the present disclosure pertains, and should not be interpreted as an excessively broad meaning or an excessively narrow meaning. In addition, when technical terms used in the specification are inappropriate technical terms that cannot accurately express the contents and ideas of the specification, it is necessary to understand them instead of technical terms that can be correctly understood by a skilled person. In addition, the general terms used in the present specification should be construed according to content or context defined in advance and should not be construed as excessively contracted meanings.

In addition, as used in this specification, the expression singular includes the plural unless the context clearly indicates otherwise. In the present application, terms such as "comprising" and "having" are not to be construed as necessarily including all of the plurality of components or steps described in the specification, but rather as including only a part of the components or a part of the steps, or including additional components or steps.

In addition, the terms including ordinal numbers 1, 2, etc. used in the present specification may be used to describe various constituent elements, but the constituent elements must not be limited by the terms. The term is used only for the purpose of distinguishing one component from another. For example, the 1 st component may be named as the 2 nd component, and similarly, the 2 nd component may be named as the 1 st component without exceeding the scope of the claims.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected or connected to the other component or may be interposed therebetween. Conversely, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there are no other components in between.

The embodiments are described in detail below with reference to the drawings, and the same or similar constituent elements are given the same reference numerals and repeated description thereof is omitted regardless of the drawing numbers. In addition, in describing the present invention, when it is judged that a detailed description of related known techniques may obscure the gist of the present specification, the detailed description is omitted. In addition, it should be noted that the drawings are only for enabling easier understanding of the content and the idea of the present specification, and should not be interpreted as the content and the idea of the present specification are defined by the drawings. The disclosure and concepts of the specification should be construed as extending to all modifications, equivalents, and alternatives in addition to the drawings.

In the present specification, "a or B (Aor B)" may mean "a only", "B only" or "all of a and B". In other words, in the present specification, "a or B (Aor B)" may be interpreted as "a and/or B (a and/or B)". For example, in this specification, "A, B or C (a, B or C)" may mean "a only", "B only", "C only", or "A, B and C in any and all combinations (any combination of A, B and C)".

The slash (/) or the pause (comma) used in the present specification may mean "and/or (and/or)". For example, "A/B" may mean "A and/or B". Thus, "a/B" may mean "a only", "B only", or "all of a and B". For example, "A, B, C" may mean "A, B or C".

In the present specification, "at least one a and B (at least one of A and B)" may mean "a only", "B only" or "all a and B". In addition, in this specification, the expression of "at least one a or B (at least one of A or B)" or "at least one a and/or B (at least one of A and/or B)" may be interpreted as the same as "at least one a and B (at least one of A and B)".

In addition, in the present specification, "at least one A, B and C (at least one of A, B and C)" may mean "a only", "B only", "C only", or "any and all combinations (any combination of A, B and C) of A, B and C". In addition, "at least one A, B or C (at least one of A, B or C)" or "at least one A, B and/or C (at least one of A, B and/or C)" may mean "at least one A, B and C (at least one of A, B and C)".

In addition, brackets used in the present specification may mean "for example". Specifically, when identified as "control information (PDCCH)", as one example of the "control information", it is possible to propose "PDCCH (physical downlink control channel)". In other words, the "control information" of the present specification is not limited (limit) by the "PDCCH", and the "PDDCH" may be proposed as one example of the "control information". In addition, in the case of the identification of "control information (i.e., PDCCH)", the "PDCCH" may be proposed as one example of the "control information".

In the present specification, the technical features described individually in one drawing may be implemented either independently or simultaneously.

UE (User Equipment) is shown by way of example in the drawings, but the UE shown may also be replaced by terms such as Terminal, ME (Mobile Equipment), etc. In addition, the UE may be a portable device such as a notebook computer, a cellular Phone, a PDA (personal digital assistant), a Smart Phone, a multimedia device, or the like, or a non-portable device such as a PC, an in-vehicle apparatus.

In the following, a UE is used as an example of a wireless communication-enabled device (e.g., a wireless communication device, a wireless device, or a wireless apparatus). The operations performed by the UE may be performed by any device that may communicate wirelessly. May also be referred to as a wireless communication capable device, a wireless communication device, a wireless apparatus, or the like.

The term base station used below generally refers to a fixed location (fixed station) for communication with wireless devices and may be used as a broad term including eNodeB (enhanced-NodeB), eNB (enhanced-NodeB), BTS (Base Transceiver System), access Point (Access Point), gNB (Next generation NodeB), RRH (remote radio head), TP (transmission Point), RP (reception Point), repeater (relay), etc.

The present description uses LTE, LTE-a and NR systems to describe embodiments, but these embodiments may also be applied to any communication system where the definition applies.

< Wireless communication System >

With the success of LTE (long term evolution)/LTE-Advanced (LTE-a) for fourth generation mobile communication, fifth generation (so-called 5G) mobile communication as the next generation has been commercialized and is under subsequent study.

The fifth generation mobile communication defined by the International Telecommunications Union (ITU) means to provide a maximum data transmission speed of 20Gbps and a minimum somatosensory transmission speed of 100Mbps or more at any location. The formal name is 'IMT-2020'.

Three major usage scenarios are proposed in the ITU, such as eMBB (enhanced Mobile BroadBand), mMTC (massive Machine Type Communication) and URLLC (Ultra Reliable and Low Latency Communications).

URLLC relates to application scenarios requiring high reliability and low latency. Services such as autopilot, factory automation, augmented reality require high reliability and low latency (e.g., latency below 1 ms). The delay of current 4G (LTE) is statistically 21-43ms (best 10%), 33-75ms (mean). This is not sufficient to support services requiring a delay of less than 1 ms. Then, the emmbb usage scenario relates to a usage scenario requiring mobile ultra-wideband.

That is, the fifth generation mobile communication system supports higher capacity than the current 4G LTE, can increase the density of mobile broadband users, supports D2D (Device to Device), high stability, and MTC (Machine type communication). In order to better realize the internet of things, 5G research and development also aims at lower standby time and lower power consumption than a 4G mobile communication system. For such 5G mobile communication, a New radio access technology (New radio access technology: new RAT or NR) may be proposed.

The NR frequency band (frequency band) can be defined as a frequency range (frequency range) of two types (FR 1, FR 2). The values of the frequency ranges may be varied, for example, the frequency ranges of the two types (FR 1, FR 2) may be as shown in table 1 below. For ease of description, FR1 in the frequency range used by the NR system may mean "sub 6GHz range", FR2 may mean "above 6GHz range", and may be referred to as millimeter wave (mmW).

[ Table 1 ]

Frequency range name	Corresponding frequency range	Subcarrier spacing
			FR1	410MHz-7125MHz	15、30、60kHz
FR2	24250MHz-52600MHz	60、120、240kHz

The frequency range value of the NR system may be varied. For example, FR1, as shown in table 1, may include a frequency band of 410MHz to 7125 MHz. That is, FR1 may include frequency bands above 6GHz (or 5850, 5900, 5925MHz, etc.). For example, bands above 6GHz (or 5850, 5900, 5925MHz, etc.) included in FR1 may include unlicensed bands (unlicensed bands). The unlicensed band may be used for a variety of purposes, for example, may be used for vehicle communications (e.g., autopilot).

On the other hand, the 3 GPP-based communication standard defines a downlink physical channel corresponding to a resource element that carries information from an upper layer, and a downlink physical signal corresponding to a resource element that is used by a physical layer but does not carry information from an upper layer. For example, a physical downlink shared channel (physical downlink shared channel, PDSCH), a physical broadcast channel (physical broadcast channel, PBCH), a physical multicast channel (physical multicast channel, PMCH), a physical control format indicator channel (physical control format indicator channel, PCFICH), a physical downlink control channel (physical downlink control channel, PDCCH), and a physical hybrid ARQ indicator channel (physical hybrid ARQ indicator channel, PHICH) are defined as downlink physical channels, and a reference signal and a synchronization signal are defined as downlink physical signals. A Reference Signal (RS) is also referred to as pilot, meaning a signal of a predefined special waveform that the gNB and the UE know to each other, e.g., a cell-specific RS (cell specific RS), a UE-specific RS (UE-RS), a Positioning RS (PRS), and a channel state information RS (channel state information RS, CSI-RS) are defined as downlink reference signals. The 3GPP LTE/LTE-a standard defines an uplink physical channel corresponding to a resource element that carries information from an upper layer, and an uplink physical signal corresponding to a resource element that is used by a physical layer but does not carry information from an upper layer. For example, a physical uplink shared channel (physical uplink shared channel, PUSCH), a physical uplink control channel (physical uplink control channel, PUCCH), a physical random access channel (physical random access channel, PRACH) are defined as an uplink physical channel, and a demodulation reference signal (demodulation reference signal, DMRS) for an uplink control/data signal and a sounding reference signal (sounding reference signal, SRS) for uplink channel measurement are defined.

In this specification, PDCCH (Physical Downlink Control CHannel)/PCFICH (Physical Control Format Indicator CHannel)/PHICH ((Physical Hybrid automatic retransmit request Indicator CHannel)/PDSCH (Physical Downlink Shared CHannel)) refers to a set of time-frequency resources or a set of resource elements carrying DCI (downlink control information)/CFI (Control Format Indicator)/downlink ACK/NACK (acknowledgement/Negative ACK)/downlink data, respectively, and PUCCH (Physical Uplink Control CHannel)/PUSCH (Physical Uplink Shared CHannel)/PRACH (Physical Random Access CHannel) refers to a set of time-frequency resources or a set of resource elements carrying UCI (Uplink Control Information)/uplink data/random access signal, respectively.

Fig. 1 is a diagram illustrating a wireless communication system.

Referring to fig. 1, a wireless communication system includes at least one Base Station (BS). The BS is divided into a gndeb (or gNB) 20a and an eNodeB (or eNB) 20b. The gNB20a supports fifth generation mobile communications. The eNB20b supports fourth generation mobile communications, LTE (long term evolution).

Each base station 20a and 20b provides communication services for a particular geographic area (commonly referred to as a cell) 20-1, 20-2, 20-3. A cell may be subdivided into regions (called sectors).

UE (User Equipment) typically belongs to a cell, and the cell to which the UE belongs is called a serving cell (serving cell). A base station providing a communication service to a serving cell is referred to as a serving base station (serving BS). The wireless communication system is a cellular system (cellular system) and thus there are other cells adjacent to the serving cell. The other cells adjacent to the serving cell are called neighbor cells (neighbor cells). A base station providing a communication service to a neighbor cell is referred to as a neighbor base station (neighbor BS). The serving cell and the neighboring cell are relatively determined with reference to the UE.

Hereinafter, downlink refers to communication from the base station 20 to the UE10, and uplink refers to communication from the UE10 to the base station 20. In the downlink, a transmitter may be part of the base station 20 and a receiver may be part of the UE 10. In the uplink, the transmitter may be part of the UE10 and the receiver may be part of the base station 20.

On the other hand, wireless communication systems can be roughly classified into a FDD (frequency division duplex) scheme and a TDD (time division duplex) scheme. According to the FDD scheme, uplink transmission and downlink transmission occupy mutually different frequency bands. According to the TDD scheme, uplink transmission and downlink transmission occupy the same frequency band and are performed at different times from each other. The channel response of the TDD scheme is interactive (interactive) in nature. The downlink channel response and the uplink channel response are nearly identical in a given frequency region. Accordingly, in a TDD-based wireless communication system, the downlink channel response has advantages that can be obtained from the uplink channel response. In the TDD scheme, the uplink transmission and the downlink transmission are time-divided over all frequency bands, and thus the downlink transmission of the base station and the uplink transmission of the UE cannot be performed simultaneously. In a TDD system in which uplink transmission and downlink transmission are divided into subframe units, uplink transmission and downlink transmission are performed in subframes different from each other.

Fig. 2 shows the structure of a radio frame used by NR.

In NR, uplink and downlink transmissions are made up of frames. The radio Frame has a length of 10ms and is defined as 25 ms Half Frames (HF). Half frame is defined as 5 1ms subframes (subframes, SF). The subframe is divided into more than one time slot, and the number of time slots in the subframe depends on SCS (Subcarrier Spacing). Each slot includes 12 or 14 OFDM (a) symbols according to CP (cyclic prefix). When using the normal CP, each slot includes 14 symbols. When extended CP is used, each slot includes 12 symbols. Wherein the symbols may include OFDM symbols (or CP-OFDM symbols), SC-FDMA symbols (or DFT-s-OFDM symbols).

< support diverse parameter set (numerology) >

In the NR system, as the wireless communication technology advances, a plurality of parameter sets (numerology) may also be provided to the terminal. For example, when the SCS is 15kHz, a wide area (wide area) in the conventional cellular band is supported, when the SCS is 30kHz/60kHz, dense-urban (dense-uban), lower latency (lower latency) and wider carrier bandwidth (wider carrier bandwidth) are supported, and when the SCS is 60kHz or higher, a bandwidth greater than 24.25GHz is supported in order to overcome phase noise (phase noise).

The parameter set may be defined according to a CP (cycle prefix) length and subcarrier spacing (Subcarrier Spacing: SCS). One cell may provide a plurality of parameter sets to a terminal. When the parameter set index is denoted by μ, the CP length corresponding to each subcarrier spacing may be as shown in the following table.

[ Table 2 ]

μ	△f＝2μ15[kHz]	CP
			0	15	General
1	30	General
			2	60	General, extension
3	120	General
			4	240	General
5	480	General
			6	960	General

For the normal CP, when the index of the parameter set is expressed in μ, the number of OFDM symbols per slot (nslotsmb), the number of slots per frame (Nframe, μslot), and the number of slots per subframe (Nsubframe, μslot) are shown in the following table.

[ Table 3 ]

For the extended CP, when the index of the parameter set is expressed in μ, the number of OFDM symbols per slot (nslotsmb), the number of slots per frame (Nframe, μslot), and the number of slots per subframe (Nsubframe, μslot) are shown in the following table.

[ Table 4 ]

In an NR system, an OFDM (A) parameter set (numerology) (e.g., SCS, CP length, etc.) may be set differently among a plurality of cells combined into one terminal. Therefore, the (absolute Time) interval of Time resources (e.g., SF, slots, or TTIs) composed of the same number of symbols (collectively referred to as TU (Time Unit) for convenience) may be set differently among the combined cells.

Referring to fig. 3a, the ue connects to LTE/LTE-a based cells and NR based cells in a DC (dual connectivity) manner.

The NR based cell is connected to a core network (core network) for the original fourth generation mobile communication, i.e., EPC (Evolved Packet Core).

Referring to fig. 3b, unlike fig. 3a, the LTE/LTE-a based cell is connected to a core network for fifth generation mobile communication, i.e., a 5G core network.

The service scheme based on the architecture shown in fig. 3a and 3b is called NSA (non-standby).

Referring to fig. 3c, the ue is connected only to NR based cells. A service scheme based on such an architecture is referred to as SA (standalone).

On the other hand, in the NR, reception from the base station may be considered to use a downlink subframe, and transmission to the base station may be considered to use an uplink subframe. This approach can be applied to paired spectrum and unpaired spectrum. A pair of spectrum means that two carrier spectrum are included for downlink and uplink operation. For example, in a pair of spectrums, one carrier may include downlink and uplink bands paired with each other.

Fig. 4 shows a slot structure of an NR frame.

A slot includes a plurality of symbols in the time domain. For example, one slot includes 14 symbols for the normal CP, and 12 symbols for the extended CP. The carrier includes a plurality of subcarriers in the frequency domain. RB (Resource Block) is defined in the frequency domain as a plurality (e.g., 12) of contiguous subcarriers. BWP (Bandwidth Part) is defined as a plurality of consecutive (physical, P) RBs in the frequency domain, which may correspond to one parameter set (numerology) (e.g., SCS, CP length, etc.). The terminal may constitute a maximum of N (e.g., 4) BWPs in the downlink and uplink, respectively. Downlink or uplink transmission may be performed through active BWP, and only one BWP among the terminal-established BWP may be active at a given time (at a given time). In a Resource grid, each Element is called a Resource Element (RE), and a complex symbol can be mapped.

Fig. 5 shows an example of subframe types in NR.

TTI (transmission time interval) shown in fig. 5 may be referred to as a subframe or slot for NR (or new RAT). The subframe (or slot) of fig. 5 may be used in a TDD system of NR (or new RAT) to minimize data transmission delay. As shown in fig. 5, a subframe (or slot) includes 14 symbols. The front symbols of the subframe (or slot) may be used for a Downlink (DL) control channel and the rear symbols of the subframe (or slot) may be used for an Uplink (UL) control channel. The remaining symbols may be used for DL data transmission or UL data transmission. According to such a subframe (or slot) structure, downlink transmission and uplink transmission may be sequentially performed in one subframe (or slot). Accordingly, downlink data may be received within a subframe (or time slot) within which an uplink acknowledgement response (ACK/NACK) may also be transmitted.

Such a subframe (or slot) structure may be referred to as a self-contained subframe (or slot).

Specifically, the first N symbols in a slot may be used to transmit DL control channels (hereinafter referred to as DL control regions), and the last M symbols in a slot may be used to transmit UL control channels (hereinafter referred to as UL control regions). N and M are integers greater than or equal to 0. A resource region (hereinafter, referred to as a data region) between the DL control region and the UL control region may be used for DL data transmission or for UL data transmission. For example, in a DL control region, a physical downlink control channel (physical downlink control channel, PDCCH) may be transmitted, and in a DL data region, a physical downlink shared channel (physical downlink shared channel, PDSCH) may be transmitted. In the UL control region, a physical uplink control channel (physical uplink control channel, PUCCH) may be transmitted, and in the UL data region, a physical uplink shared channel (physical uplink shared channel, PUSCH) may be transmitted.

If such a structure of subframes (or slots) is used, there is an advantage in that the time required for retransmitting data in which a reception error occurs can be reduced to minimize the final data transmission standby time. In such a self-contained subframe (or slot) structure, a time difference (time gap) may be required in the transition from the transmission mode to the reception mode or from the reception mode to the transmission mode. For this, in the subframe structure, a part of OFDM symbols at the time of transition from DL to UL may be set as a Guard Period (GP).

Fig. 6 shows the structure of a self-contained slot.

In the NR system, a frame is characterized by a self-contained structure that can entirely include a DL control channel, DL or UL data, a UL control channel, and the like in one slot. For example, the first N symbols in a slot may be used to transmit DL control channels (hereinafter referred to as DL control regions), and the last M symbols in a slot may be used to transmit UL control channels (hereinafter referred to as UL control regions). N and M are integers greater than or equal to 0. A resource region (hereinafter, referred to as a data region) between the DL control region and the UL control region may be used for DL data transmission or for UL data transmission. As one example, the following constitution may be considered. The intervals are listed in chronological order.

Dl only configuration

Ul only configuration

3. Hybrid (Mixed) UL-DL configuration

DL region + GP (Guard Period) +ul control region

DL control region+gp+ul region

DL region: (i) DL data area, (ii) DL control area+dl data area

UL region: (i) UL data region, (ii) UL data region+ul control region

PDCCH may be transmitted in a DL control region and PDSCH may be transmitted in a DL data region. The PUCCH may be transmitted in the UL control region and the PUSCH may be transmitted in the UL data region. DCI (Downlink Control Information), for example, DL data scheduling information, UL data scheduling information, etc., may be transmitted in the PDCCH. UCI (Uplink Control Information), e.g., ACK/NACK (Positive Acknowledgement/Negative Acknowledgement) information, CSI (Channel State Information) information, SR (Scheduling Request), etc., for DL data may be transmitted in the PUCCH. The GP may provide a time difference in the course of the base station and the terminal switching from the transmission mode to the reception mode or from the reception mode to the transmission mode. Within a subframe, a part of symbols at a time point of transition from DL to UL may be set as GP.

Fig. 7 shows a SSB (Synchronization signal block) structure.

The terminal may perform cell search (search), acquire system information, beam alignment for initial access, DL measurement, etc., based on SSB. SSB is mixed with SS/PBCH (Synchronization Signal/Physical Broadcast channel) blocks.

Referring to fig. 7, ssb is composed of PSS, SSS, and PBCH. SSB consists of 4 consecutive OFDM symbols, with PSS, PBCH, SSS/PBCH and PBCH transmitted per OFDM symbol. The PSS and SSS consist of 1 OFDM symbol and 127 subcarriers, respectively, and the PBCH consists of 3 OFDM symbols and 576 subcarriers. Polarity encoding and QPSK (Quadrature Phase Shift Keying) are applied in the PBCH. The PBCH is composed of data REs and DMRS (Demodulation Reference Signal) REs for each OFDM symbol. There are 3 DMRS REs per RB, and there are 3 data REs between DMRS REs.

< disclosure of the present specification >

In 3GPP LTE and NR, a technology for energy saving is discussed only in a terminal section where portability and mobility are required to be maximally achieved, but in order to cope with various environmental/legal problems such as carbon neutralization, the necessity of introducing an energy saving technology in a network element such as a base station, a core network, and the like has long been proposed. Particularly in release 18, studies (study) and work items (work items) on network energy conservation (Network Energy Saving) were negotiated, and related studies were conducted from month 4 to month 11 of 2022, and standards were predetermined to be established before month 8 of 2023.

Network energy conservation is roughly divided into network power related KPI (key performance indicator) introduction methods and techniques for practical implementation, and is currently under investigation. Table 5 below shows the goals of a specific study (study item).

[ Table 5 ]

Various types of base station energy saving techniques can be studied with respect to the target No. 3 in table 5, and particularly, a large number of techniques for properly controlling the power supply of the base station and adjusting the frequency of transmission of the necessary signals have been proposed.

On the other hand, network energy saving technology is mostly implemented while reducing communication performance to some extent. For example, in a technique of cutting off the power supply when no user is present, a restart delay occurs when a new user flows in, and a delay occurs in the transmission/reception speed, the delay time, and the like. Therefore, it is necessary to accurately judge the current situation and set up appropriately according to the situation, and to issue signaling as soon as possible.

However, even a base station incorporating the network energy saving technology corresponding to the 3GPP release 18 needs to be able to normally receive services in a terminal or network supporting only the technology of the prior release 17, and therefore, the network energy saving related signaling needs to be implemented in such a manner that the impact on such an original terminal is minimized and the performance degradation of the terminal supporting the new function caused by energy saving is also limited to the maximum extent.

In this specification, a signaling method for issuing network energy/power saving parameters to a terminal is provided. As one example, a method of determining a frequency of a base signal according to a degree of network energy saving and transmitting signaling based thereon is provided.

In addition, in the present specification, a terminal operation method and apparatus for receiving signaling on network power saving parameters are provided.

In this specification, it is intended to provide (1) a scheme regarding a network power saving parameter determination method, (2) a scheme regarding a network power saving related signaling method in a release 18 terminal, and (3) a scheme regarding a network power saving operation method of a terminal before release 18 (e.g., release 17).

The terms used in the present specification are defined below.

The release 18 terminal means a terminal that supports the network power saving related technology applied in release 18 and can understand the corresponding signaling, and the release 17 terminal means a terminal that does not support the network power saving related technology and cannot understand the corresponding signaling. Thus, in combination, terminals that support some of the functionality of version 16, version 15, and/or version 18, but do not support network power saving techniques, may also be included in the category of version 17 terminals as distinguished in this specification.

First publication: scheme for network energy saving parameter determination method

The method may be implemented in a form of adjusting SSB (Synchronization Signal Block) frequency, SIB (System Information Block) transmission frequency, CSI-RS (channel state information-reference signal) transmission frequency, and state transition (transmission) determination threshold (threshold) or RACH (Random Access Channel) reception frequency, respectively. Such respective values may be predefined for terminals, and for situations where the network energy saving level is different, a plurality of parameters may be defined for release 18 terminals. For example, for the SSB frequency, an area in which the SSB is actually transmitted may be issued in a bitmap (bitmap) format in the original 1 to 8 index (index). That is, several bitmaps may be defined by RRC, and then the actual SSB transmission morphology is determined according to the network energy saving parameter values. The network energy-saving parameter can be a universal value, can be determined according to each energy-saving element, and can be in a form of grouping a plurality of energy-saving elements. For example, for a general value, the base station may determine the network power saving level as a particular integer form. Further, according to such an integer index, a value to be actually relied upon can be defined among a plurality of individual energy saving elements configured by RRC. Even when the energy saving elements are specified for each energy saving element, the types of the energy saving elements specified by the corresponding parameters are limited, and the energy saving elements can be expressed in the same form. For example, the element to be used as the energy saving mode may be issued and operated in a bitmap form using a bit corresponding to the energy saving component element.

Second publication: scheme of network energy-saving signaling method for release 18 terminal

The network energy saving parameters to be delivered through the first disclosed approach described above may be utilized by delivering to the release 18 terminal. For this purpose, the corresponding parameters may be issued in the form of GC-PDCCH (Group Common-Physical Downlink Control Channel), and the Group may be set to RNTI (Radio Network Temporary Identifier) for scrambling (scrambling) in advance for release 18 terminals. Alternatively, the terminal-specific (scheduled) PDCCH may be transmitted, and a format or RNTI differentiated from other PDCCHs may be applied. The corresponding DCI (downlink control information) transmitted through the GC-PDCCH or dedicated (scheduled) PDCCH may be issued along with the network energy-saving and power-saving parameters along with other information introduced by release 18, or may be additionally included in the original DCI 2.X transmission information for transmission.

Upon completion of such transmission, the terminal may perform an operation predetermined by network power saving immediately or after a predetermined set timing after reception or after the next unit frame. For example, rate matching (rate matching) based on changed SSB positions may be performed. Either the added CSI-RS reception and CSI feedback operations may be performed or the deleted CSI-RS correlation operations may not be performed. For example, for SSB or CSI-RS resource regions related to rate matching (rate matching), it may be determined whether to exclude transmission of the corresponding region from the network power saving parameter values indicated by the conditions of predefined RRC (radio resource control) and DCI or the like.

Fig. 8 shows an example of applying the previously described first and/or second disclosed schemes to CSI-RS and CSI-related signaling.

Referring to fig. 8, after configuring RRC configuration (configuration) of CSI-RS resources (resources) and/or CSI reports (reports) related to network power saving parameters, the base station transmits the configured RRC configuration (configuration) of CSI-RS resources (resources) and/or RRC configuration (configuration) of CSI reports (reports) to terminals S801 and S802. As a method for transmitting each RRC configuration (configuration) to the terminal, each RRC configuration may be transmitted as independent signaling, or may be transmitted together as one signaling.

In addition, after the base station transmits the RRC configuration (configuration) for the network power saving parameter related CSI-RS resource (resource) and/or the RRC configuration (configuration) for the CSI report (report) to the terminal, in order to apply the transmitted RRC configuration (configuration), DCI for CSI-RS transceiving and/or CSI report may be transmitted to the terminal S803. The DCI may include network energy saving related parameter information.

On the other hand, after the terminal receives RRC configuration (configuration) for network energy-saving related CSI-RS resources (resources) and/or RRC configuration of CSI reports (reports) from the base station, if DCI containing network energy-saving related parameter information is received, a trigger (trigger) to perform CSI-RS reception and/or the CSI feedback. Accordingly, the terminal receives at least one CSI-RSS804 from the base station and performs CSI feedback to the base station, i.e., transmits a CSI report (report) to the base station S805, based on the received at least one RS (i.e., one CSI-RS or a plurality of CSI-RSS: CSI-RS (S)).

In yet another aspect, the DCI may be received from a base station after a terminal receives CSI-RS reception and before CSI feedback is performed. That is, the terminal may receive at least one CSI-RS after receiving the DCI from the base station, thereby performing CSI feedback, i.e., transmitting a CSI report (report) to the base station. At this time, the DCI including the network energy saving related parameter information may perform CSI feedback, i.e., trigger (trigger) only for CSI report (report) transmission.

Fig. 9 shows an example of RRC configuration (configuration) for CSI-RS resources (resource) and CSI reports (report) of fig. 8 described earlier, DCI configuration (configuration) for CSI-RS transceiving and/or CSI reporting.

Referring to fig. 9, RRC configuration for CSI-RS resources (resources) is to first set legacy CSI-RS. Then, N sub-configurations (L and N are natural numbers greater than 1) may be set from L sub-configurations (sub-configurations) for CSI-RS(s). Each sub-configuration (sub-configuration) may have a power adaptation (power adaptation) and/or an antenna adaptation (antenna adaptation) mode (pattern), and N sub-configurations (sub-configurations) may be defined as bitmap shapes.

The RRC configuration of CSI report (report) constitutes a CSI report of the reference CSI-RS(s). Wherein the CSI-RS(s) may have the N sub-configurations (sub-configurations) described above.

The DCI-based CSI-RS transceiving and/or CSI reporting configuration (configuration) may include information indicating a trigger (triggering) state of the N sub-configurations (sub-configurations) described previously. The information indicating the trigger (trigger) state of the N sub-configurations may include network power saving related parameter information, which may be indicated in a bitmap form.

Third publication: scheme of network energy-saving operation method for version 17 terminal

Basically, a release 17 terminal that cannot receive network power saving parameters cannot perform the same power saving state operation as a release 18 terminal. However, for such terminals, the base station needs to support that the corresponding terminal can perform the best operation when it collides with the configuration situation.

(1) SSB related operation method: first, in the case of SSB, two cases can be assumed. First, the transmission frequency understood by the release 18 terminal is greater than the SSB transmission frequency understood by the release 17 terminal. At this time, the base station has a problem that the release 17 terminal cannot perform proper rate matching (rate matching) in the case where scheduling (scheduling) in the release 17 terminal is performed at SSB transmission positions understood by only the release 18 terminal. Therefore, the base station does not perform scheduling (scheduling) of the corresponding location for the release 17 terminal, or performs transmission in the form of puncturing (puncturing) in the SSB region, if performed. The puncturing (puncturing) in this specification means the following operation.

For example, assume a case where ABCDEFGH information is transmitted in 8 resource areas. At this time, it is assumed/judged that the version 17 terminal transmits information in the ABCDEFGH word. However, the information of S, T which the release 18 terminal should receive is actually transmitted on the 4 th and 8 th sides. For this purpose, there are two processing methods, first, the abcsfer morphology transmission in which information is sequentially transmitted in consideration of the reduction of resource areas. Also, transmission may be performed in the form of abcsfgt, which simply removes D, H information. Here, puncturing (puncturing) in the present specification means the transmission form of the latter. Version 17 terminal cannot learn that S, T is transmitted instead of D, H, and that T is transmitted instead of H because S is transmitted instead of D, and thus receives a part of erroneous information, but the base station would expect to recover the information by using error correction of FEC (Forward Error Correction) based on the ABC and EFG information normally transmitted and thus achieve successful reception. However, the reception performance of the release 17 terminal is generally degraded due to the additional error signal, and in order to compensate for this problem, the base station may perform transmission to the release 17 terminal using the MCS (modulation and coding scheme) index lower than the current CQI (channel quality indicator) index.

Second, it is possible to envisage a case where the transmission frequency understood by the release 18 terminal is less than the SSB transmission frequency understood by the release 17 terminal. At this time, an area where the release 17 terminal considers the SSB location and actually does not transmit the SSB may occur, and for this area, the base station may expect a rate matching (rate matching) operation of the terminal to exclude the area where the SSB needs to be transmitted and allocate the PDSCH for transmission when the scheduling (scheduling) is normally indicated to the release 18 terminal and then the scheduling (scheduling) is indicated to the release 17 terminal. Of course, this exclusion operation is not required when the region is scheduled (scheduling) to the release 18 terminal, and thus the release 18 terminal can utilize the corresponding resources with higher performance.

(2) CSI-RS related operation method: as with SSB, the case of CSI-RS also occurs in an area where release 17 terminals consider CSI-RS to be present but not actually present or an area where CSI-RS are considered not present but actually present. For each case, in the former case, the base station may exclude the CSI-RS region from transmission when scheduling (scheduling) to the release 17 terminal, instruct not to perform CSI reporting in the corresponding region, or perform in a form of ignoring the reporting of the result of the performing. In the latter case, the base station also does not schedule (scheduling) release 17 terminals in the corresponding region, or even schedule (scheduling) transmits in a form that does not perform puncturing (puncturing) in the CSI-RS region.

As described above, the case where the transmission area understood by the existing terminal for the SSB and the CSI-RS is different from the actual transmission area is described, but the same method can be applied to other signals periodically transmitted.

The solutions provided in the present specification may be applied independently or in any combination. In addition, in the case where a term used in the present invention is a new term, any name that easily understands meaning is used, and in the case where a different term having practically the same meaning is used, the present invention can also be applied.

Fig. 10 shows an example of SSB-related operation for the third disclosed legacy UE described earlier, i.e., release 17 terminal. In fig. 10, SSB-related operations are exemplarily shown, but the same may be applied for CSI-RS-related operations.

Referring to the left side of fig. 10, SSBs may be allocated and transmitted with PDSCH through a resource region understood by a legacy (legacy) UE at SSB transmission positions understood by the legacy (legacy) UE. At this time, the legacy (legacy) UE can receive the expected SSB and PDSCH without additional supplementary operations.

Referring to the right side of fig. 10, SSBs may be allocated at NES (network energy saving) UEs, i.e., SSB transmission locations understood by release 18 terminals, by resource regions understood by NES (network energy saving) UEs, multiplexed (multiplexed) with PDSCH, and transmitted to legacy (legacy) UEs. At this time, SSB transmission of the SSB resource region understood by the legacy (legacy) UE may not occur, and in addition, SSB transmission may occur through the PDSCH resource region understood by the legacy (legacy) UE. The base station may transmit PDSCH in a form of performing puncturing (puncturing) for such SSB resource regions where SSB transmission does not occur. Also, SSB transmission for NES (network energy saving) UEs may be implemented through PDSCH resource regions understood by legacy (legacy) UEs, at which time, for such SSB transmission, legacy (legacy) UEs may understand noise (noise), as described in the foregoing third disclosure, the base station may perform PDSCH transmission using a lower MCS in order to implement FEC.

< summary of the embodiments of the present specification >

Referring to fig. 11, a terminal receives CSI-RS (channel state information-reference signal) S1101 from a base station. Then, the terminal performs CSI feedback (feedback) S1102. Wherein performing CSI feedback corresponds to transmitting CSI reports to a base station.

On the other hand, at least one of the CSI-RS reception of the terminal and the execution of the CSI feedback may be triggered (trigger) by DCI (downlink control information) reception including network energy saving related parameter information. Wherein the DCI may be received through a terminal-specific (scheduled) PDCCH (physical downlink control channel).

In addition, the network energy saving related parameter information may be in a bitmap (bitmap) form. Also, the network energy saving related parameter information may be set through RRC (radio resource control) layers.

At least one of the CSI-RS reception and the execution of the CSI feedback is triggered (trigger) after a given time after the DCI reception.

Referring to fig. 12, the base station transmits CSI-RS (channel state information-reference signal) to the terminal S1201. Then, the base station receives CSI feedback (feedback) from the terminal S1102.

On the other hand, at least one of the CSI-RS transmission and the CSI feedback reception of the base station may be triggered (trigger) by DCI (downlink control information) transmission including network energy saving related parameter information. Wherein the DCI may be transmitted through a terminal-specific (scheduled) PDCCH (physical downlink control channel).

At least one of the CSI-RS transmission and the CSI feedback reception may be triggered (trigger) after a given time after the DCI transmission.

< description discloses applicable device overview >

The disclosure of the present specification described above can be achieved by various means. For example, the disclosure of the present specification may be implemented by hardware, firmware (firmware), software, a combination thereof, or the like. And will be described in detail with reference to the accompanying drawings.

Referring to fig. 13, the wireless communication system may include a first apparatus 100a and a second apparatus 100b.

The first device 100a may be a base station, a network node, a transmission terminal, a reception terminal, a wireless device, a wireless communication device, a vehicle with an autopilot function, a smart Car (Connected Car), an unmanned aerial vehicle (Unmanned Aerial Vehicle, UAV), AI (Artificial Intelligence) module, a robot, AR (Augmented Reality) device, VR (Virtual Reality) device, MR (Mixed Reality) device, holographic device, public safety device, MTC device, ioT device, medical device, financial science and technology device (or financial device), security device, climate/environment device, 5G service related device, or a fourth industrial revolution field related device other than the above.

The second device 100b may be a base station, a network node, a transmission terminal, a reception terminal, a wireless device, a wireless communication device, a vehicle with an autopilot function, a smart Car (Connected Car), an unmanned aerial vehicle (Unmanned Aerial Vehicle, UAV), AI (Artificial Intelligence) module, a robot, AR (Augmented Reality) device, VR (Virtual Reality) device, MR (Mixed Reality) device, holographic device, public safety device, MTC device, ioT device, medical device, financial science and technology device (or financial device), security device, climate/environment device, 5G service related device, or a fourth industrial revolution field related device other than the above.

The first apparatus 100a may include: at least one processor, such as processor 1020a, at least one more memory, such as memory 1010a, at least one more transceivers, such as transceiver 1031 a. The processor 1020a may perform the aforementioned functions, steps and/or methods. The processor 1020a may execute more than one protocol. For example, the processor 1020a may execute more than one layer of a radio interface protocol. The memory 1010a may be coupled to the processor 1020a and store various forms of information and/or instructions. The transceiver 1031a may be coupled to the processor 1020a and may control the transceiver to transmit and receive wireless signals.

The second device 100b may include at least one processor, such as the processor 1020b, at least one more memory device, such as the memory 1010b, at least one transceiver, such as the transceiver 1031 b. The processor 1020b may perform the aforementioned functions, steps and/or methods. The processor 1020b may implement more than one protocol. For example, the processor 1020b may implement more than one layer of a radio interface protocol. The memory 1010b may be coupled to the processor 1020b and store various forms of information and/or instructions. The transceiver 1031b may be coupled to the processor 1020b and may control the transceiver to transmit and receive wireless signals.

The memory 1010a and/or the memory 1010b may be connected to each other within the processor 1020a and/or the processor 1020b or external thereto, or may be connected to other processors by various techniques such as wired or wireless connection.

The first device 100a and/or the second device 100b may have more than one antenna. For example, antenna 1036a and/or antenna 1036b may be configured to transmit and receive wireless signals.

And in particular fig. 14, is a diagram showing the aforementioned apparatus of fig. 13 in more detail.

The device includes a memory 1010, a processor 1020, a transceiver 1031, a power management module 1091, a battery 1092, a display 1041, an input 1053, a speaker 1042, and microphones 1052, SIM (subscriber identification module), one or more antennas.

The processor 1020 may be configured to implement the functions, steps, and/or methods described and presented herein. Layers of the radio interface protocol (radio interface protocol) may be implemented in the processor 1020. The processor 1020 may include an ASIC (application-specific integrated circuit), other chipset, logic circuit, and/or data processing device. The processor 1020 may be AP (application processor). The processor 1020 may include at least one of DSP (digital signal processor), CPU (central processing unit), GPU (graphics processing unit), modem (Modem: modulator and demodulator). The processor 1020 may be, for exampleManufactured snapdagantm series processor, < +.>EXYNOSTM series processor manufactured, < ->Manufactured A series processor->HELIOTM series processor, and ∈K>ATOMTM series processor, manufactured,/ >Manufactured kirntm series processors or corresponding new generation processors.

The power management module 1091 manages power for the processor 1020 and/or transceiver 1031. The battery 1092 provides power to the power management module 1091. The display device 1041 outputs a result processed by the processor 1020. The input 1053 receives input to be used by the processor 1020. The input unit 1053 may be displayed on the display device 1041. The SIM card is an integrated circuit used to identify and authenticate a network-accessing user in mobile devices such as cell phones and computers IMSI (international mobile subscriber identity), as well as to securely store keys associated therewith. Telephone directory information may also be stored in many SIM cards.

Memory 1010 is operably coupled to processor 1020 and stores a variety of information for operating processor 610. Memory 1010 may include ROM (read-only memory), RAM (random access memory), flash memory, memory cards, storage media, and/or other storage devices. When the embodiments are implemented in software, the techniques described in this specification may be implemented in modules (e.g., procedures, functions, and so on) that perform the functions described in this specification. Modules may be stored in the memory 1010 and executed by the processor 1020. Memory 1010 may be implemented within processor 1020. Or the memory 1010 may be implemented external to the processor 1020 and communicatively coupled to the processor 1020 via various means as is known in the art.

Transceiver 1031 is operably associated with processor 1020 to transmit and/or receive wireless signals. The transceiver 1031 includes a transmitter and a receiver. The transceiver 1031 may include a baseband circuit for processing a radio frequency signal. The transceiver controls one or more wires to transmit and/or receive wireless signals. To start communication, the processor 1020 issues command information to the transceiver 1031 to transmit, for example, wireless signals constituting voice communication data. The antenna performs the function of transmitting and receiving wireless signals. When receiving wireless signals, the transceiver 1031 may send out signals and convert the signals to baseband for processing by the processor 1020. The processed signals may be converted into audible or visual information output through a speaker 1042.

The speaker 1042 outputs the sound correlation result processed by the processor 1020. Microphone 1052 receives sound related inputs that processor 1020 will use.

The user inputs instruction information such as a telephone number by pressing a button (or touching) of the input unit 1053 or by voice activation (voice activation) by the microphone 1052, for example. The processor 1020 receives and processes such instructional information to perform the appropriate function, for example, to place the telephone number. Operational data may be retrieved from the SIM card or memory 1010. In addition, the processor 1020 may display instruction information or operation information on the display device 1041 for a user to recognize for convenience.

As can be appreciated with reference to fig. 15, a processor 1020 implementing the disclosure of the present specification may include a plurality of circuits (circuits) to implement the functions, steps and/or methods described and set forth in the present specification. For example, the processor 1020 may include a first circuit 1020-1, a second circuit 1020-2, and a third circuit 1020-3. In addition, although not shown, the processor 1020 may include additional circuitry. Each circuit may include a plurality of transistors.

The processor 1020 may also be referred to as an ASIC (application-specific integrated circuit) or AP (application processor), and may include at least one of DSP (digital signal processor), CPU (central processing unit), GPU (graphics processing unit).

Referring to fig. 16, the transceiver 1031 includes a transmitter 1031-1 and a receiver 1031-2. The transmitter 1031-1 includes a DFT (Discrete Fourier Transform) part 1031-11, a subcarrier mapper 1031-12, an IFFT part 1031-13, and a CP inserting part 1031-14, and a radio transmitting part 1031-15. The transmitter 1031-1 may further comprise a modulator. Further, for example, a scrambling unit (not shown), a modulation mapper (not shown, modulation mapper), a layer mapper (not shown), and a layer arranger (not shown) may be further included, which may be disposed before the DFT sections 1031 to 11. That is, in order to prevent an increase in PAPR (peak-to-average power ratio), the transmitter 1031-1 first passes information through the DFT1031-11 before mapping the signal to the sub-carriers. The signal spread (or synonymous precoding) by the DFT section 1031-11 is subcarrier mapped by the subcarrier mapper 1031-12, and then formed into a signal on the time axis by the IFFT (Inverse Fast Fourier Transform) section 1031-13.

The DFT sections 1031-11 perform DFT on the input symbols to output complex symbols (complex-value symbols). For example, if an Ntx symbol is input (but Ntx is a natural number), the DFT size (size) is Ntx. The DFT sections 1031-11 may be referred to as transform precoders (transform precoder). Subcarrier mappers 1031-12 map the complex symbols to subcarriers of the frequency domain. The complex symbols may be mapped to resource elements corresponding to resource blocks allocated for data transmission. Subcarrier mappers 1031-12 may be referred to as resource mappers (resource element mapper). The IFFT sections 1031 to 13 may perform IFFT with respect to the input symbols to output baseband (baseband) signals for data as time domain signals. The CP inserting sections 1031 to 14 copy the rear portion of the baseband signal for data and insert the same into the front portion of the baseband signal for data. ISI (Inter-Symbol Interference) and ICI (Inter-Carrier Interference) can be prevented by CP insertion, and orthogonality can be maintained in the multiplexed channel.

On the other hand, the receiver 1031-2 includes a wireless receiving section 1031-21, a CP removing section 1031-22, an FFT section 1031-23, an equalizing section 1031-24, and the like. The radio receiving section 1031-21, CP removing section 1031-22, FFT section 1031-23 of the receiver 1031-2 perform the inverse functions of the radio transmitting section 1031-15, CP inserting section 1031-14, IFF section 1031-13 in the transmitting terminal 1031-1. The receiver 1031-2 may further comprise a demodulator.

The preferred embodiments have been described above by way of example, but the disclosure of the present specification is not limited to these specific embodiments, and thus may be modified, altered or improved into various forms within the scope of the idea of the present specification and the description of the claims.

In the above-described exemplary system, the method is described as a series of steps or blocks based on a flowchart, but is not limited to the order of the steps described, and some steps may be performed in a different order or concurrently. In addition, those skilled in the art will appreciate that the steps illustrated in the flowcharts are not exclusive and that other steps may be included or one or more steps in the flowcharts may be deleted without affecting the scope of the claims.

The claims set forth in the description may be combined in various ways. For example, the technical features of the method claims described in the present specification may be combined and implemented by an apparatus, and the technical features of the apparatus claims of the present specification may be combined and implemented by a method. In addition, the technical features of the method claims and the technical features of the apparatus claims of the present specification may be combined and implemented by an apparatus, and the technical features of the method claims and the technical features of the apparatus claims of the present specification may be combined and implemented by a method.

Claims

1. A method of operation of a terminal in a wireless communication system, comprising:

a step of receiving a channel state information reference signal; and

After receiving the channel state information reference signal, executing channel state information feedback;

wherein at least one of the channel state information reference signal reception and the execution of the channel state information feedback is triggered by downlink control information reception including network energy saving related parameter information.

2. The method of operation of a terminal in a wireless communication system as claimed in claim 1, wherein,

the downlink control information is received through a terminal-specific physical downlink control channel.

3. The method of operation of a terminal in a wireless communication system as claimed in claim 1, wherein,

the network energy-saving related parameter information is in a bitmap form.

4. The method of operation of a terminal in a wireless communication system as claimed in claim 1, wherein,

the network energy-saving related parameter information is set through a radio resource control layer.

5. The method of operation of a terminal in a wireless communication system as claimed in claim 1, wherein,

the network energy-saving related parameter information comprises channel state information reference signal transmission frequency information.

6. The method of operation of a terminal in a wireless communication system as claimed in claim 1, wherein,

at least one of the channel state information reference signal reception and the execution of the channel state information feedback is triggered after a given time after the downlink control information reception.

7. A method of operation of a base station in a wireless communication system, comprising:

transmitting a channel state information reference signal; and

A step of receiving channel state information feedback after transmitting the channel state information reference signal;

wherein at least one of the channel state information reference signal transmission and the channel state information feedback reception is triggered by downlink control information transmission including network energy saving related parameter information.

8. The method of operation of a base station in a wireless communication system as claimed in claim 7, wherein,

the downlink control information is transmitted through a terminal-specific physical downlink control channel.

9. The method of operation of a base station in a wireless communication system as claimed in claim 7, wherein,

the network energy-saving related parameter information is in a bitmap form.

10. The method of operation of a base station in a wireless communication system as claimed in claim 7, wherein,

11. The method of claim 7, wherein,

12. The method of operation of a base station in a wireless communication system as claimed in claim 8, wherein,

at least one of the channel state information reference signal transmission and the channel state information feedback reception is triggered after a given time after the transmission.

13. A communication device, as a communication device in a wireless communication system, comprising:

at least one processor; and

At least one memory storing instructions and being operatively electrically connectable with the at least one processor;

wherein the operations performed based on the instructions being executed by the at least one processor include:

a step of receiving a channel state information reference signal; and

a step of executing channel state information feedback after receiving the channel state information reference signal;

14. The communication device of claim 13, wherein,

15. The communication device of claim 13, wherein,

the network energy-saving related parameter information is in a bitmap form.

16. The communication device of claim 13, wherein,

17. The communication device of claim 13, wherein,

18. The communication device of claim 13, wherein,