KR20200094046A - The method of enhancing carrier aggregation in the next generation wireless communication systems - Google Patents

Abstract

The present disclosure relates to a communication technique for fusing a 5^th generation (5G) communication system with an Internet of things (IoT) technology to support a higher data transmission rate than that of a 4^th generation (4G) system and a system thereof. The present disclosure can be applied to an intelligent service (for example, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety related services, etc.) based on a 5G communication technology and an IoT-related technology. According to the present disclosure, a control signal processing method in a wireless communication system comprises the steps of: receiving a first control signal transmitted from a base station; processing the first control signal received; and transmitting a second control signal generated based on the processing to the base station.

Description

The method of enhancing carrier aggregation in the next generation wireless communication systems}

The present invention relates to a method and apparatus for improving carrier aggregation technology in a next generation mobile communication system.

In addition, the present invention relates to an efficient state transition method and apparatus in a next generation mobile communication system.

Efforts have been made to develop an improved 5G communication system or a pre-5G communication system to meet the increasing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is called a 4G network (Beyond 4G Network) communication system or an LTE system (Post LTE) or later system.

To achieve high data rates, 5G communication systems are contemplated for implementation in the ultra-high frequency (mmWave) band (eg, 60 gigabit (60 GHz) band). In order to mitigate path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, in 5G communication systems, beamforming, massive array multiple input/output (massive MIMO), full dimensional multiple input/output (FD-MIMO) ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed.

In addition, in order to improve the network of the system, in the 5G communication system, the evolved small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) ), Device to Device communication (D2D), wireless backhaul, mobile network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation ) And other technologies are being developed. In addition, in the 5G system, advanced coding modulation (Advanced Coding Modulation (ACM)) Hybrid FSK and QAM Modulation (FQAM) and SSC (Sliding Window Superposition Coding), SWB (Advanced Coding Modulation, Filter Bank Multi Carrier), NOMA (non orthogonal multiple access), and SCMA (sparse code multiple access) are being developed.

Meanwhile, the Internet is evolving from a human-centered connection network where humans generate and consume information, to an Internet of Things (IoT) network that exchanges information between distributed components such as objects. Internet of Everything (IoE) technology, in which big data processing technology, etc. through connection to a cloud server, is combined with IoT technology is also emerging. In order to implement IoT, technical elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, a machine to machine (Machine to Machine) , M2M), MTC (Machine Type Communication) and other technologies are being studied. In the IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects to create new values in human life may be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, high-tech medical service through convergence and combination between existing IT (information technology) technology and various industries. It can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system to an IoT network. For example, 5G communication technology such as sensor network, machine to machine (M2M), and MTC (Machine Type Communication) is implemented by techniques such as beamforming, MIMO, and array antenna. It is. It may be said that the application of cloud radio access network (cloud RAN) as the big data processing technology described above is an example of 5G technology and IoT technology convergence.

In the next generation mobile communication system, carrier aggregation technology may be used to provide a service having a high data rate and a low transmission delay to a terminal. However, there is a need for a method for preventing processing delays that may occur when setting and activating a carrier aggregation technology or deactivating a carrier aggregation technology after using a carrier aggregation technology for a terminal having a network connection.

In addition, in the next generation mobile communication system, carrier aggregation technology may be used to provide a service having a high data rate and a low transmission delay to a terminal. However, there is a need for a method for preventing processing delays that may occur when setting and activating a carrier aggregation technology or deactivating a carrier aggregation technology after using a carrier aggregation technology for a terminal having a network connection.

The present invention for solving the above problems is a method for processing a control signal in a wireless communication system, comprising: receiving a first control signal transmitted from a base station; Processing the received first control signal; And transmitting a second control signal generated based on the processing to the base station.

The present invention proposes a new dormant mode so that the RRC connected mode terminal establishing a connection with a network in a next generation mobile communication system can quickly activate and deactivate carrier aggregation technology. The present invention proposes a method for operating a new hibernation mode on a cell level (cell-level) and a method for operating a hibernation (hibernation or dormant) mode on a partial bandwidth unit (Bandwidth part-level) carrier It enables quick activation of the integrated technology and saves the battery of the terminal.

In addition, the present invention proposes a new dormant mode so that an RRC connected mode terminal that establishes a connection with a network in a next generation mobile communication system can quickly activate and deactivate carrier aggregation technology. The present invention proposes a method for operating a new hibernation mode on a cell level (cell-level) and a method for operating a hibernation (hibernation or dormant) mode on a partial bandwidth unit (Bandwidth part-level) carrier It enables quick activation of the integrated technology and saves the battery of the terminal.

1A is a diagram showing the structure of an LTE system to which the present invention can be applied.
1B is a diagram showing a radio protocol structure in an LTE system to which the present invention can be applied.
1C is a diagram showing the structure of a next-generation mobile communication system to which the present invention can be applied.
1D is a diagram showing a radio protocol structure of a next generation mobile communication system to which the present invention can be applied. .
1E is a diagram showing a procedure for efficiently servicing a terminal using a very wide frequency bandwidth in a next-generation mobile communication system of the present invention.
1f shows a procedure for a terminal to switch from an RRC idle mode to an RRC connected mode in a next-generation mobile communication system of the present invention, and sets a plurality of bandwidth parts (BWP) This is a diagram that proposes a method for setting a default bandwidth (default BWP) or a first active BWP.
1G is a diagram illustrating a state transition procedure of a cell or partial bandwidth proposed in the present invention.
1H is a diagram illustrating a partial bandwidth state transition method through Scell unit state transition proposed in the present invention.
1I is a diagram illustrating MAC control information indicating a state transition to an activated state, a dormant state, or an inactive state proposed in the present invention.
1J is a diagram illustrating a terminal operation for performing state transition on a cell set in a terminal in the present invention.
1K illustrates a structure of a terminal to which an embodiment of the present invention can be applied.
1L shows a block configuration of TRP in a wireless communication system to which an embodiment of the present invention can be applied.
2A is a diagram showing the structure of an LTE system to which the present invention can be applied.
2B is a diagram showing a radio protocol structure in an LTE system to which the present invention can be applied.
2C is a diagram showing the structure of a next-generation mobile communication system to which the present invention can be applied.
2D is a diagram illustrating a radio protocol structure of a next-generation mobile communication system to which the present invention can be applied. .
2E is a diagram showing a procedure for service to a terminal by efficiently using a very wide frequency bandwidth in a next-generation mobile communication system of the present invention.
2f shows a procedure for a terminal to switch from an RRC idle mode to an RRC connected mode in a next-generation mobile communication system of the present invention, and sets a plurality of bandwidth parts (BWP) This is a diagram that proposes a method for setting a default bandwidth (default BWP) or a first active BWP.
2G is a diagram showing a state transition procedure of a cell or a partial bandwidth proposed in the present invention.
2H is a diagram illustrating a partial bandwidth state transition method through a partial bandwidth unit state transition proposed in the present invention.
2i is a diagram showing MAC control information indicating a state transition to an activated state, a dormant state, or an inactive state proposed in the present invention.
2J is a diagram illustrating a terminal operation for performing state transition on a cell set in a terminal in the present invention.
2K shows a structure of a terminal to which an embodiment of the present invention can be applied.
2L illustrates a block configuration of TRP in a wireless communication system to which an embodiment of the present invention can be applied.

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description, when it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Terms used to identify a connection node used in the following description, terms referring to network objects, terms referring to messages, terms referring to interfaces between network objects, terms referring to various identification information Etc. are exemplified for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms indicating objects having equivalent technical meanings may be used.

For convenience of description below, the present invention uses terms and names defined in the 3GPP 3rd Generation Partnership Project Long Term Evolution (LTE) standard. However, the present invention is not limited by the terms and names, and may be applied to systems conforming to other standards. In the present invention, the eNB may be used in combination with the gNB for convenience of explanation. That is, a base station described as an eNB may indicate gNB.

1A is a diagram showing the structure of an LTE system to which the present invention can be applied.

Referring to Figure 1a, as shown, the radio access network of the LTE system is a next-generation base station (Evolved Node B, hereinafter referred to as ENB, Node B or base station) (1a-05, 1a-10, 1a-15, 1a-20) It consists of MME (1a-25, Mobility Management Entity) and S-GW (1a-30, Serving-Gateway). User equipment (hereinafter referred to as UE or UE) 1a-35 accesses an external network through ENBs 1a-05 to 1a-20 and S-GW 1a-30.

In FIG. 1A, ENBs 1a-05 to 1a-20 correspond to existing Node Bs of the UMTS system. The ENB is connected to the UE (1a-35) through a radio channel and performs a more complicated role than the existing Node B. In the LTE system, all user traffic, including real-time services such as Voice over IP (VoIP) through the Internet protocol, are serviced through a shared channel, so status information such as buffer status of UEs, available transmission power status, channel status, etc. It is necessary to have a device for scheduling by collecting, and ENB (1a-05 ~ 1a-20) is in charge. One ENB usually controls multiple cells. For example, in order to realize a transmission speed of 100 Mbps, the LTE system uses, for example, an orthogonal frequency division multiplexing (OFDM) in a 20 MHz bandwidth as a radio access technology. In addition, an adaptive modulation & coding (hereinafter referred to as AMC) method is applied to determine a modulation scheme and a channel coding rate according to a channel state of a terminal. S-GW (1a-30) is a device that provides a data bearer, and generates or removes a data bearer under the control of the MME (1a-25). MME is a device that is responsible for various control functions as well as mobility management functions for terminals, and is connected to multiple base stations.

1B is a diagram showing a radio protocol structure in an LTE system to which the present invention can be applied.

Referring to Figure 1b, the radio protocol of the LTE system is the PDCP (Packet Data Convergence Protocol 1b-05, 1b-40), RLC (Radio Link Control 1b-10, 1b-35), MAC (Medium Access) respectively in the terminal and the ENB Control 1b-15, 1b-30). PDCP (Packet Data Convergence Protocol) (1b-05, 1b-40) is responsible for IP header compression/restore. The main functions of PDCP are summarized as follows.

-Header compression and decompression (ROHC only)

-Transfer of user data

-In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM

-For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

-Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM

-Retransmission function (Retransmission of PDCP SDUs at handover and, for split bearers in DC, of PDCP PDUs at PDCP data-recovery procedure, for RLC AM)

-Encryption and decryption function (Ciphering and deciphering)

-Timer-based SDU discard function (Timer-based SDU discard in uplink.)

Radio link control (hereinafter referred to as RLC) (1b-10, 1b-35) reconfigures the PDCP packet data unit (PDU) to an appropriate size to perform ARQ operation and the like. The main functions of RLC are summarized as follows.

-Data transfer function (Transfer of upper layer PDUs)

-ARQ function (Error Correction through ARQ (only for AM data transfer))

-Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer)

-Re-segmentation of RLC data PDUs (only for AM data transfer)

-Reordering of RLC data PDUs (only for UM and AM data transfer)

-Duplicate detection (only for UM and AM data transfer)

-Error detection function (Protocol error detection (only for AM data transfer))

-RLC SDU deletion function (RLC SDU discard (only for UM and AM data transfer))

-RLC re-establishment

MAC (1b-15, 1b-30) is connected to several RLC layer devices configured in one terminal, and performs an operation of multiplexing RLC PDUs to MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC are summarized as follows.

-Mapping function (Mapping between logical channels and transport channels)

-Multiplexing and demultiplexing function (Multiplexing/demultiplexing of MAC SDUs belonging to one or different logical channels into/from transport blocks (TB) delivered to/from the physical layer on transport channels)

-Scheduling information reporting function

-HARQ function (Error correction through HARQ)

-Priority handling between logical channels (Priority handling between logical channels of one UE)

-Priority handling between UEs (Priority handling between UEs by means of dynamic scheduling)

-MBMS service identification function

-Transport format selection function

-Padding function

The physical layer (1b-20, 1b-25) channel-codes and modulates the upper layer data, makes it an OFDM symbol and transmits it to the radio channel, or demodulates and decodes the OFDM symbol received through the radio channel and transmits it to the upper layer. Do the action.

1C is a diagram showing the structure of a next-generation mobile communication system to which the present invention can be applied.

Referring to FIG. 1C, a radio access network of a next-generation mobile communication system (hereinafter referred to as NR or 5G) is a next-generation base station (New Radio Node B, NR gNB or NR base station) 1c-10 and NR CN (1c). -05, New Radio Core Network). The user terminal (New Radio User Equipment, NR UE or terminal) 1c-15 accesses the external network through the NR gNB 1c-10 and the NR CN 1c-05.

In Figure 1c, NR gNB (1c-10) corresponds to the evolved Node B (eNB) of the existing LTE system. The NR gNB is connected to the NR UE (1c-15) through a radio channel and can provide superior service than the existing Node B. In the next-generation mobile communication system, since all user traffic is serviced through a shared channel, a device is required to collect and schedule status information such as buffer status of UEs, available transmission power status, and channel status, and this is NR NB (1c-10) is in charge. One NR gNB usually controls multiple cells. In order to implement ultra-high-speed data transmission compared to the current LTE, it may have more than the existing maximum bandwidth, and orthogonal frequency division multiplexing (hereinafter referred to as OFDM) as a wireless access technology may additionally incorporate beamforming technology. . In addition, an adaptive modulation & coding (hereinafter referred to as AMC) method is applied to determine a modulation scheme and a channel coding rate according to a channel state of a terminal. NR CN (1c-05) performs functions such as mobility support, bearer setup, and QoS setup. NR CN is a device that is responsible for various control functions as well as mobility management functions for terminals, and is connected to multiple base stations. In addition, the next generation mobile communication system can be linked with the existing LTE system, and the NR CN is connected to the MME (1c-25) through a network interface. MME is connected to the existing base station eNB (1c-30).

1D is a diagram showing a radio protocol structure of a next generation mobile communication system to which the present invention can be applied.

Referring to Figure 1d, the radio protocol of the next-generation mobile communication system is NR SDAP (1d-01, 1d-45), NR PDCP (1d-05, 1d-40), NR RLC (1d-10) at the terminal and the NR base station, respectively. , 1d-35), NR MAC (1d-15, 1d-30).

The main functions of the NR SDAP (1d-01, 1d-45) may include some of the following functions.

Transfer of user plane data

-Mapping function between QoS flow and data bearer for uplink and downlink (mapping between a QoS flow and a DRB for both DL and UL)

-Marking QoS flow ID for both uplink and downlink (marking QoS flow ID in both DL and UL packets)

-Reflective QoS flow to DRB mapping for the UL SDAP PDUs for uplink SDAP PDUs.

For the SDAP layer device, the UE can set whether to use the header of the SDAP layer device or the function of the SDAP layer device, for each PDCP layer device, for each bearer, or for each logical channel, as an RRC message, and the SDAP header When is set, the NAS QoS reflection setting 1-bit indicator (NAS reflective QoS) of the SDAP header and the AS QoS reflection setting 1-bit indicator (AS reflective QoS) allow the UE to map the uplink and downlink QoS flow and mapping information for the data bearer. You can instruct it to update or reset. The SDAP header may include QoS flow ID information indicating QoS. The QoS information may be used as data processing priority and scheduling information to support a smooth service.

The main functions of NR PDCP (1d-05, 1d-40) may include some of the following functions.

Header compression and decompression: ROHC only

-Transfer of user data

-In-sequence delivery of upper layer PDUs

-Out-of-sequence delivery of upper layer PDUs

-Reordering function (PDCP PDU reordering for reception)

-Duplicate detection of lower layer SDUs

-Retransmission of PDCP SDUs

-Encryption and decryption function (Ciphering and deciphering)

-Timer-based SDU discard function (Timer-based SDU discard in uplink.)

In the above, the order reordering function of the NR PDCP device (reordering) refers to a function of reordering PDCP PDUs received from a lower layer in order based on a PDCP sequence number (SN), and transmitting data to a higher layer in the rearranged order. It may include or, without considering the order, may include a function to immediately deliver, may include a function to record the lost PDCP PDUs by rearranging the order, and report the status of the lost PDCP PDUs It may include a function for transmitting to the sender, and may include a function for requesting retransmission for lost PDCP PDUs.

The main functions of the NR RLC (1d-10, 1d-35) may include some of the following functions.

-Data transfer function (Transfer of upper layer PDUs)

-In-sequence delivery of upper layer PDUs

-Out-of-sequence delivery of upper layer PDUs

-ARQ function (Error Correction through ARQ)

-Concatenation, segmentation and reassembly of RLC SDUs

-Re-segmentation of RLC data PDUs

-Reordering of RLC data PDUs

-Duplicate detection function

-Protocol error detection

-RLC SDU deletion function (RLC SDU discard)

-RLC re-establishment

In the above, the in-sequence delivery of the NR RLC device refers to a function of sequentially transmitting RLC SDUs received from a lower layer to an upper layer, and one RLC SDU is originally divided into multiple RLC SDUs and received. If it is, it may include a function to reassemble and deliver it, and may include a function to rearrange the received RLC PDUs based on RLC sequence number (SN) or PDCP sequence number (SN). It may include a function of recording lost RLC PDUs, may include a function of reporting a status of lost RLC PDUs to a transmitting side, and a function of requesting retransmission of lost RLC PDUs. If there is a lost RLC SDU, it may include a function of forwarding only the RLC SDUs up to the previous layer in order until the lost RLC SDU, or if a predetermined timer expires even if there is a lost RLC SDU It may include a function of delivering all RLC SDUs received before the start to the upper layer in order, or if a predetermined timer expires even if there is a missing RLC SDU, all RLC SDUs received so far to the upper layer in order. It can include the ability to deliver. In addition, the RLC PDUs can be processed in the order in which they are received (regardless of the sequence number and sequence number, in order of arrival) and delivered to the PDCP device in any order (out-of sequence delivery). Thereafter, segments that are stored in a buffer or to be received at a later time can be received, reconstructed into a single RLC PDU, processed, and then transmitted to a PDCP device. The NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

In the above, out-of-sequence delivery of the NR RLC device refers to a function of directly transmitting RLC SDUs received from a lower layer to an upper layer regardless of order, and one RLC SDU originally has multiple RLCs. When divided and received into SDUs, it may include a function of reassembling it and transmitting it, and may include a function of storing RLC SNs or PDCP SNs of received RLC PDUs and arranging the order to record lost RLC PDUs. Can.

NR MAC (1d-15, 1d-30) may be connected to several NR RLC layer devices configured in one terminal, the main function of the NR MAC may include some of the following functions.

-Mapping function (Mapping between logical channels and transport channels)

-Multiplexing/demultiplexing of MAC SDUs

-Scheduling information reporting function

-HARQ function (Error correction through HARQ)

-Priority handling between logical channels (Priority handling between logical channels of one UE)

-Priority handling between UEs (Priority handling between UEs by means of dynamic scheduling)

-MBMS service identification function

-Transport format selection function

-Padding function

The NR PHY layer (1d-20, 1d-25) channel-codes and modulates upper layer data, makes it an OFDM symbol and transmits it to a radio channel, or demodulates and decodes an OFDM symbol received through a radio channel to a higher layer. You can perform the transfer operation.

The present invention proposes a method for quickly activating carrier aggregation in a next generation mobile communication system and saving a terminal battery.

The network or the base station may configure Spcells (Pcell and PScell) and a plurality of Scells to the UE. In the above, the Spcell indicates the Pcell when the terminal communicates with one base station, and when the terminal communicates with the two base stations (master base station and secondary base station), it can indicate the Pcell of the master base station or the PScell of the secondary base station. . In the above, Pcell or Pscell denotes a main cell used when a terminal and a base station communicate in each MAC layer device, sets timing to perform synchronization, performs random access, sends HARQ ACK/NACK feedback as a PUCCH transmission resource It means the cell that sends and receives most control signals. In the above, a technology in which a base station operates a plurality of Scells together with a Spcell to increase transmission resources and increase uplink or downlink data transmission resources is called carrier aggregation technology.

When the UE receives Spcell and a plurality of Scells, a mode may be set for each Scell. In the Scell mode, an active mode and a deactivated mode may be set. In the activation mode, the UE can send and receive uplink or downlink data with the base station in the activation mode Scell (or the activated partial bandwidth of the Scell), monitor the PDCCH to confirm the indication of the base station, and activate the mode The UE may perform channel measurement on the downlink of the Scell (or the activated partial bandwidth of the Scell) and periodically report the measurement information to the base station, and the UE may perform a pilot signal (sounding) so that the base station can perform the uplink channel measurement. Reference Signal, SRS) may be periodically transmitted to the base station.

However, in the deactivation mode, the UE cannot exchange data with the base station in the Scell, does not monitor the PDCCH to confirm the indication of the base station, does not perform channel measurement, does not perform measurement reporting, and transmits a pilot signal. I never do that.

Therefore, in order to activate the Scells in the inactive mode, the base station first sets the frequency measurement configuration information to the terminal through an RRC message, and the terminal performs cell or frequency measurement based on the frequency measurement configuration information. And the base station can activate the deactivated Scells based on the frequency/channel measurement information after receiving the cell or frequency measurement report of the terminal. This causes a lot of delay in the base station to activate the carrier aggregation technology to the terminal.

The present invention proposes a dormant mode for the Scell (or partial bandwidth) so as to reduce the delay and reduce the battery of the terminal.

In the dormant mode, the UE cannot exchange data with the base station in the dormant Scell (dormant Scell) or dormant partial bandwidth (dormant BWP (BandWidth Part)), and does not monitor the PDCCH to confirm the indication of the base station. However, it is characterized in that it does not transmit the pilot signal, but performs channel measurement and reports the measurement result for the measured frequency/cell/channel periodically or when an event occurs. Therefore, since the UE does not monitor the PDCCH in the dormant Scell or dormant partial bandwidth (BWP) and does not transmit a pilot signal, the UE can save battery compared to the activated mode, and the inactive mode and the moon perform channel measurement reporting. Therefore, the base station can use the carrier aggregation technology by quickly activating the dormant Scell or dormant partial bandwidth based on the measurement report based on the measurement report.

In the next generation mobile communication system, since a very high frequency band can be used, the frequency bandwidth may also be very wide. However, supporting a very wide bandwidth in a terminal implementation requires high implementation complexity and high cost. Therefore, in the next generation mobile communication system, the concept of a partial bandwidth (BWP) can be introduced, and a plurality of partial bandwidths (BWP) are set in one cell (Spcell or Scell), and one or more according to the instructions of the base station. Data can be transmitted and received over a partial bandwidth.

In the present invention, when introducing the sleep mode proposed in the present invention, it is characterized in that it proposes a state transition method and a specific operation in consideration of a plurality of partial bandwidths set in the Scell and the Scell. In addition, the method of managing the dormant mode in Scell-level (Scell-level) and the method of state transition and the method of managing and status-transfer in partial bandwidth unit (BWP-level) are proposed respectively, and each mode (enable or deactivate or dormant) We propose the operation of a specific partial bandwidth according to.

In the present invention, the partial bandwidth (BWP) can be used without distinguishing the uplink and the downlink, and the meaning may indicate the uplink partial bandwidth and the downlink partial bandwidth, respectively, depending on the context.

1E is a diagram showing a procedure for efficiently servicing a terminal using a very wide frequency bandwidth in a next-generation mobile communication system of the present invention.

In FIG. 1E, it will be described how the next generation mobile communication system efficiently uses a very wide frequency bandwidth to provide services to terminals having various different capabilities (capability or category) and to save battery.

One cell provided by the base station can service a very wide frequency band, such as 1e-05. However, in order to service a terminal having different capabilities, one cell can be managed by dividing the wide frequency band into a plurality of partial bandwidths.

First, the terminal that is initially powered on can search the entire frequency band provided by the operator (PLMN) in a certain resource block unit (for example, in 12RB (Resource block) unit). That is, the UE may start searching for a primary synchronization sequence (PSS)/secondary synchronization sequence (SSS) in the entire system bandwidth in units of the resource block (1e-10). If PSS/SSS (1e-01 or 1e-02) is found in the unit of the resource block and the signals are detected, the signals are read and interpreted (decoded) to subframe and radio transmission resource frame. You can check the boundary. Therefore, it is possible to distinguish subframes in units of 1 ms, and synchronization of a downlink signal with a base station is achieved. In the above, a resource block (RB) may be defined in two-dimensional units with a size of a predetermined frequency resource and a predetermined time resource. For example, it may be defined as 1 ms unit as a time resource and 12 subcarriers (1 carrier x 15 kHz = 180 kHz) as a frequency resource. In the above, when the synchronization is completed, the UE checks the master system information block (MIB) or minimal system information (MSI) to check the information of the control resource set (CORESEST) and the initial access bandwidth (BWP) information. It can be confirmed (1e-15, 1e-20). In the above, the CORESET information refers to a location of a time/frequency transmission resource in which a control signal is transmitted from a base station, and indicates, for example, a resource location in which a PDCCH channel is transmitted. That is, the CORESET information is information indicating where the first system information (System information block 1, SIB1) is transmitted, and indicates at what frequency/time resource the PDCCH is transmitted. In the above, when the terminal reads the first system information, information on an initial partial bandwidth (initial BWP) can be confirmed. As described above, when the terminal completes synchronization of a downlink signal with a base station and can receive a control signal, the terminal performs a random access procedure in an initial partial bandwidth (initial BWP) of a cell camped on and establishes an RRC connection. Request and receive an RRC message to establish an RRC connection.

In the RRC connection setup, a plurality of partial bandwidths may be set for each cell (Pcell or Pscell or Spcell or Scell). A plurality of partial bandwidths may be set for the downlink within the single cell, and a plurality of partial bandwidths may be set separately for the uplink.

The plurality of partial bandwidths may be indicated and set as a partial bandwidth identifier (BWP Identifier) to be used as an initial partial bandwidth (initial BWP) or a default partial bandwidth (default BWP) or a first active BWP.

In the above, the initial partial bandwidth (initial BWP) may be used as a partial bandwidth determined by a cell-specific cell-level (cell-specific), and a terminal accessing the cell for the first time connects to the cell through a random access procedure. It may be used as a partial bandwidth for a terminal to establish or establish a connection to perform synchronization. In addition, the base station may set an initial downlink partial bandwidth (initial downlink BWP) to be used in the downlink and an initial uplink partial bandwidth (initial uplink BWP) to be used in the uplink, for each cell. In addition, the configuration information for the initial partial bandwidth may be broadcast in the first system information (system information 1, SIB1) indicated by CORESET, and the base station may re-set the RRC message to the terminal accessing the connection. In addition, the initial partial bandwidth can be used by designating 0 as a partial bandwidth identifier in the uplink and the downlink, respectively. That is, all terminals connected to the same cell can use the same initial partial bandwidth by designating the same partial bandwidth identifier 0. This is because when performing the random access procedure, since the base station can transmit a random access response (RAR) message with an initial partial bandwidth that all terminals can read, there may be an advantage of facilitating contention-based random access procedure. .

In the above, the first active partial bandwidth (first active BWP) may be set differently for each UE (UE specific), and may be indicated by designating a partial bandwidth identifier among a plurality of partial bandwidths. The first active partial bandwidth may be set for downlink and uplink, respectively, and as the first active uplink partial bandwidth (first active downlink BWP) and the first active uplink partial bandwidth (first active uplink BWP), respectively. Can be set. The first activated partial bandwidth may be used to indicate which partial bandwidth is initially activated and used when a plurality of partial bandwidths are set in one cell. For example, when a Pcell or a Pscell and a plurality of Scells are set to a terminal and a plurality of partial bandwidths are set for each of the Pcell or Pscell or Scell, if the Pcell or the Pscell or the Scell is activated, the terminal is connected to the Pcell or Pscell or the Scell The first active BWP may be activated and used among a plurality of set partial bandwidths. That is, the first active downlink partial bandwidth (first active downlink BWP) may be activated for the downlink, and the first activated uplink partial bandwidth (first active uplink BWP) may be activated for the uplink.

In the above, the operation of the UE to activate the first activated downlink partial bandwidth by switching the downlink partial bandwidth for the Scell and to activate the first activated uplink partial bandwidth by switching the uplink partial bandwidth is the Scell or the partial bandwidth is in an inactive state. It can be performed when an RRC message or MAC control information or DCI is received. It may also be performed when an RRC message or MAC control information or DCI is received to instruct to transition the Scell or partial bandwidth to the dormant state. Because, when activating the Scell or partial bandwidth, the channel will be in the dormant state because the downlink partial bandwidth will be switched to activate the first activated downlink partial bandwidth and to switch the uplink partial bandwidth to activate the first activated uplink partial bandwidth. This is because the base station can effectively use the carrier aggregation technology by measuring and reporting the frequency/channel for the first active downlink/uplink partial bandwidth even when performing measurement reporting.

In the above, the default partial bandwidth (default BWP) may be set differently for each UE (UE specific), and may be indicated by designating a partial bandwidth identifier among a plurality of partial bandwidths. The basic partial bandwidth may be set only for the downlink. The basic partial bandwidth may be used as a partial bandwidth in which an activated partial bandwidth among a plurality of downlink partial bandwidths will fall back after a predetermined time. For example, a partial bandwidth deactivation timer (bwp inactivity timer) can be set for each cell or for each partial bandwidth as an RRC message, and the timer starts or restarts when data transmission/reception occurs in the activated partial bandwidth rather than the basic partial bandwidth. Can be started or restarted when the activated partial bandwidth is switched to another partial bandwidth. When the timer expires, the UE may fall back or switch the downlink partial bandwidth activated in the cell to the default bandwidth. In the above, switching may denote a procedure for deactivating a currently active partial bandwidth and activating a partial bandwidth for which switching is indicated, and the switching is an RRC message or MAC control element (MAC control element) or L1 signaling (DCI (PDCCH DCI). Downlink Control Information), wherein the switching can be triggered by indicating the partial bandwidth to be switched or activated, and the partial bandwidth is a partial bandwidth identifier (eg, 0 or 1 or 2 or 3 or 4). ).

The reason for using the basic partial bandwidth only for the downlink is that the base station schedules the base station by receiving the instruction of the base station (for example, DCI of PDCCH) by causing the base station to fall back to the basic partial bandwidth after a certain time for each cell. This is because it can be easily done. For example, if the base station sets the basic partial bandwidth of terminals connected to one cell as the initial partial bandwidth, the base station may continuously perform scheduling instructions only in the initial partial bandwidth after a certain time. If the basic partial bandwidth is not set in the RRC message, the initial partial bandwidth may be regarded as the basic partial bandwidth and fall back to the initial partial bandwidth when the partial band deactivation timer expires.

In another way, in order to increase the degree of freedom of implementation of the base station, it is possible to define and set a basic partial bandwidth for the uplink and use it as the basic partial bandwidth of the downlink.

1f shows a procedure for a terminal to switch from an RRC idle mode to an RRC connected mode in a next-generation mobile communication system of the present invention, and sets a plurality of bandwidth parts (BWP) This is a diagram that proposes a method for setting a default bandwidth (default BWP) or a first active BWP.

One cell provided by the base station can service a very wide frequency band. First, the terminal may search for the entire frequency band provided by the operator (PLMN) in a certain resource block unit (for example, in 12RB (Resource block) unit). That is, the UE may start searching for a primary synchronization sequence (PSS)/secondary synchronization sequence (SSS) in the entire system bandwidth in units of the resource block. If the PSS/SSS is found in the unit of the resource block and the signals are detected, the boundary between the subframe and the radio frame can be checked by reading and interpreting (decoding) the signals. In the above, when the synchronization is completed, the system can read system information of the cell that is currently camping on. That is, by checking the Master System Information Block (MIB) or Minimum System Information (MSI), you can check the information of the Control Resource Set (CORESEST) and read the system information to check the Initial Bandwidth Part (BWP) information. (1f-01, 1f-05). In the above, the CORESET information refers to a location of a time/frequency transmission resource in which a control signal is transmitted from a base station, and indicates, for example, a resource location in which a PDCCH channel is transmitted.

As described above, when the terminal completes synchronization of a downlink signal with a base station and can receive a control signal, the terminal performs a random access procedure in an initial partial bandwidth, receives a random access response, requests RRC connection establishment, and , RRC connection establishment may be performed by receiving an RRC message (1f-10, 1f-15, 1f-20, 1f-25, 1f-30).

When the basic RRC connection setup is completed in the above, the base station may send an RRC message to the terminal to inquire about the capability of the terminal in order to check the UE capability (UECapabilityEnquiry, 1f-35). In another way, the base station may ask the MME or AMF for the terminal's capabilities to confirm the terminal's capabilities. This is because the MME or AMF may have stored the capability information of the terminal if the terminal had been previously connected. If there is no terminal capability information desired by the base station, the base station may request the terminal for terminal capability.

The reason why the base station sends an RRC message to the UE to check the UE's performance is to check the UE's performance and, for example, how much frequency band the UE can read or read. Can grasp. In addition, after confirming the performance of the terminal, an appropriate partial bandwidth (BWP) may be set for the terminal. When the UE receives the RRC message asking about the UE's performance from the above, in response to this, the UE instructs the range of the bandwidth supported by the UE or the bandwidth from the current system bandwidth to an offset from the reference center frequency or Alternatively, the start and end points of the supported frequency bandwidth can be directly indicated or the center frequency and bandwidth can be indicated (1f-40).

In the above, the partial bandwidth may be set as an RRCSetup message or an RRCResume message (1f-25) or an RRCReconfiguration message (1f-45) of an RRC connection setup, and the RRC message provides configuration information for PCell or Pscell or a plurality of Scells. It may include, and may set a plurality of partial bandwidths for each cell (PCell or Pscell or Scell). When setting a plurality of partial bandwidths for each cell, a plurality of partial bandwidths to be used in the downlink of each cell may be set. In the case of an FDD system, the uplink of each cell is distinguished from the downlink partial bandwidths. Multiple partial bandwidths to be used can be set. In the case of a TDD system, a plurality of partial bandwidths to be commonly used in downlink and uplink of each cell can be set.

Information for partial bandwidth setting of each cell (PCell or Pscell or Scell) may include the following information.

-Downlink partial bandwidth setting information of the cell

■ Initial downlink partial bandwidth (initial downlink BWP) setting information

■ Multiple partial bandwidth setting information and partial bandwidth identifier (BWP ID) corresponding to each partial bandwidth

■ Partial bandwidth identifier indicating the first active downlink partial bandwidth (first active downlink BWP)

■ Partial bandwidth identifier indicating the default partial bandwidth (default BWP)

■ Partial bandwidth deactivation timer setting and timer value

-Uplink partial bandwidth setting information of the cell

■ Initial uplink partial bandwidth (initial uplink BWP) setting information

■ Multiple partial bandwidth setting information and partial bandwidth identifier (BWP ID) corresponding to each partial bandwidth

■ Partial bandwidth identifier indicating the first active uplink partial bandwidth (first active uplink BWP)

The initial partial bandwidth (initial BWP) or the default partial bandwidth (default BWP) or the first active BWP (first active BWP) set in the above may be used for the following purposes, and may be operated as follows according to the purpose. .

In the above, the initial partial bandwidth (initial BWP) may be used as a partial bandwidth determined by a cell-specific cell-level (cell-specific), and a terminal accessing the cell for the first time connects to the cell through a random access procedure. It may be used as a partial bandwidth for a terminal to establish or establish a connection to perform synchronization. In addition, the base station may set an initial downlink partial bandwidth (initial downlink BWP) to be used in the downlink and an initial uplink partial bandwidth (initial uplink BWP) to be used in the uplink, for each cell. In addition, the configuration information for the initial partial bandwidth may be broadcast in the first system information (system information 1, SIB1) indicated by CORESET, and the base station may re-set the RRC message to the terminal accessing the connection. In addition, the initial partial bandwidth can be used by designating 0 as a partial bandwidth identifier in the uplink and the downlink, respectively. That is, all terminals connected to the same cell can use the same initial partial bandwidth by designating the same partial bandwidth identifier 0. This is because when performing the random access procedure, since the base station can transmit a random access response (RAR) message with an initial partial bandwidth that all terminals can read, there may be an advantage of facilitating contention-based random access procedure. .

In the above, the first active partial bandwidth (first active BWP) may be set differently for each UE (UE specific), and may be indicated by designating a partial bandwidth identifier among a plurality of partial bandwidths. The first active partial bandwidth may be set for downlink and uplink, respectively, and as the first active uplink partial bandwidth (first active downlink BWP) and the first active uplink partial bandwidth (first active uplink BWP), respectively. Can be set. The first activated partial bandwidth may be used to indicate which partial bandwidth is initially activated and used when a plurality of partial bandwidths are set in one cell. For example, when a Pcell or a Pscell and a plurality of Scells are set to a terminal and a plurality of partial bandwidths are set for each of the Pcell or Pscell or Scell, if the Pcell or the Pscell or the Scell is activated, the terminal is connected to the Pcell or Pscell or the Scell The first active BWP may be activated and used among a plurality of set partial bandwidths. That is, the first active downlink partial bandwidth (first active downlink BWP) may be activated for the downlink, and the first activated uplink partial bandwidth (first active uplink BWP) may be activated for the uplink.

In the above, the operation of the UE to activate the first activated downlink partial bandwidth by switching the downlink partial bandwidth for the Scell and to activate the first activated uplink partial bandwidth by switching the uplink partial bandwidth is the Scell or the partial bandwidth is in an inactive state. It can be performed when an RRC message or MAC control information or DCI is received. It may also be performed when an RRC message or MAC control information or DCI is received to instruct to transition the Scell or partial bandwidth to the dormant state. Because, when activating the Scell or partial bandwidth, the channel will be in the dormant state because the downlink partial bandwidth will be switched to activate the first activated downlink partial bandwidth and to switch the uplink partial bandwidth to activate the first activated uplink partial bandwidth. This is because the base station can effectively use the carrier aggregation technology by measuring and reporting the frequency/channel for the first active downlink/uplink partial bandwidth even when performing measurement reporting.

In the above, the default partial bandwidth (default BWP) may be set differently for each UE (UE specific), and may be indicated by designating a partial bandwidth identifier among a plurality of partial bandwidths. The basic partial bandwidth may be set only for the downlink. The basic partial bandwidth may be used as a partial bandwidth in which an activated partial bandwidth among a plurality of downlink partial bandwidths will fall back after a predetermined time. For example, a partial bandwidth deactivation timer (bwp inactivity timer) can be set for each cell or for each partial bandwidth as an RRC message, and the timer starts or restarts when data transmission/reception occurs in the activated partial bandwidth rather than the basic partial bandwidth. Can be started or restarted when the activated partial bandwidth is switched to another partial bandwidth. When the timer expires, the UE may fall back or switch the downlink partial bandwidth activated in the cell to the default bandwidth. In the above, switching may denote a procedure for deactivating a currently active partial bandwidth and activating a partial bandwidth for which switching is indicated, and the switching is an RRC message or MAC control element (MAC control element) or L1 signaling (DCI (PDCCH DCI). Downlink Control Information), wherein the switching can be triggered by indicating the partial bandwidth to be switched or activated, and the partial bandwidth is a partial bandwidth identifier (eg, 0 or 1 or 2 or 3 or 4). ).

The reason for using the basic partial bandwidth only for the downlink is that the base station schedules the base station by receiving the instruction of the base station (for example, DCI of PDCCH) by causing the base station to fall back to the basic partial bandwidth after a certain time for each cell. This is because it can be easily done. For example, if the base station sets the basic partial bandwidth of terminals connected to one cell as the initial partial bandwidth, the base station may continuously perform scheduling instructions only in the initial partial bandwidth after a certain time. If the basic partial bandwidth is not set in the RRC message, the initial partial bandwidth may be regarded as the basic partial bandwidth and fall back to the initial partial bandwidth when the partial band deactivation timer expires.

In another way, in order to increase the degree of freedom of implementation of the base station, it is possible to define and set a basic partial bandwidth for the uplink and use it as the basic partial bandwidth of the downlink.

In addition, in the RRCSetup message or RRCResume message (1f-25) or RRCReconfiguration message (1f-45) of the RRC connection setup, the terminal does not receive an RRC message or MAC control information from the base station or an indication due to DCI of the PDCCH. A state transition timer can be set to perform a state transition. For example, by setting a cell deactivation timer (ScellDeactivationTimer) for each Scell, when the cell deactivation timer expires, the Scell may transition to an inactive state. In addition, by setting a cell sleep timer (ScellHibernationTimer) for each Scell, when the cell sleep timer expires, the Scell may transition to a sleep state. When the cell dormancy timer expires, only the activated Scell may transition to the dormant state, and the inactive or dormant Scell may not transition to the dormant state. In addition, by setting a dormant cell deactivation timer (dormantScellDeactivationTimer) for each Scell, the Scell in the dormant state can be transitioned to the inactive state. When the dormant state cell deactivation timer expires, only the Scell that has been dormant may transition to the inactive state, and the Scell that has been activated or inactive may not transition to the inactive state. If the cell deactivation timer (ScellDeactivationTimer) and the cell sleep timer (ScellHibernationTimer) are set together, the cell sleep timer (ScellHibernationTimer) may be prioritized. That is, when the cell sleep timer (ScellHibernationTimer) is set, even if the cell deactivation timer (ScellDeactivationTimer) expires, the corresponding Scell is not deactivated. In other words, when the cell sleep timer is set, the Scell first transitions from the active state to the sleep state with the expiration of the cell sleep timer, and the cell transitioned to the sleep state with the expiration of the sleep cell deactivation timer again. Characterized in that the transition to the inactive state step by step. Therefore, if the cell sleep timer is set, the cell deactivation timer does not affect the Scell state transition, and even if the cell deactivation timer expires, if the cell sleep timer is set, the Scell does not transition to the deactivated state.

When the cell deactivation timer is not set in the RRC message, the UE may consider the cell deactivation timer to be set to an infinite value.

In addition, in the above, in the RRCSetup message or RRCResume message (1f-25) or RRCReconfiguration message (1f-45) of the RRC connection setup, frequency measurement configuration information and frequency measurement gap setting information may be set. And may include information on a frequency measurement object. The frequency measurement report object may include partial bandwidth information in which a reference signal (RS)/synchronization signal (SS) is set, and a center frequency, a bandwidth corresponding to the partial bandwidth, and applied when measuring It may include a time pattern (time pattern) that should be. The measurement report gap information may include measurement gap length, measurement gap period, and measurement gap start time information corresponding to how long to measure. In the above, RS is a signal of a base station that is transmitted with a time/frequency pattern partially in a transmission resource of a subframe in which a control signal or a data signal is transmitted, and is used to determine the strength of a signal of a corresponding partial bandwidth or a corresponding cell. Can. The SS signal is a synchronization signal that is periodically transmitted, such as PSS or SSS, which can also be used to determine the corresponding partial bandwidth or the signal strength of the corresponding cell.

When the RRC connection is established as described above, the UE may set a plurality of partial bandwidths according to the instructions set by the RRC message. In addition, one or a small number of bandwidths may be activated among the plurality of partial bandwidths set in order to save the battery. For example, one partial bandwidth to be activated may be indicated. In addition, the base station instructs the activation of the partial bandwidth as an RRC message or as MAC control information (MAC CE) or L1 signaling (a PHY layer control signal such as PDCCH) (eg, bitmap information may indicate whether to deactivate activation). By doing so, it is possible to instruct to switch from the initial access partial bandwidth to the new partial bandwidth. Since there may be many new users accessing the initial access partial bandwidth, it may be more advantageous to allocate a new partial bandwidth and manage separately connected users in terms of scheduling. This is because the initial access part bandwidth is not set for each terminal, but can be shared and used for all terminals. It is also possible to dynamically indicate the default partial bandwidth with the MAC control information or L1 signaling or system information (to reduce signaling overhead).

Next, the present invention proposes a new hibernation state in a next-generation mobile communication system, and proposes a method for supporting three state transitions on a cell basis.

1G is a diagram illustrating a state transition procedure of a cell or partial bandwidth proposed in the present invention.

As shown in Figure 1g, each cell or partial bandwidth of the terminal may have an active state (1g-01) or an inactive state (1g-03) or a dormant state (1g-02), or RRC message configuration information or MAC control information, or The state transition can be performed due to the indication by the DCI of the PDCCH.

The state transition operation (activation or deactivation or dormancy) of the Scell proposed in the present invention may be performed in the following cases.

-When Scell status is set by RRC message,

-Scell activation and deactivation When MAC CE is received,

-When Scell dormant MAC CE is received,

-If the cell dormancy timer is not set in the activation state Scell, and the set cell inactivity timer has expired,

-When the cell sleep timer set in the activation state Scell has expired,

-If the sleep state Scell deactivation timer set in the sleep state Scell has expired,

In addition, the state transition operation proposed in the present invention may have the following features.

-Spcell (Pcell or Pscell) cannot be transitioned to the dormant state and is characterized by always activating. Spcells are synchronized and the main control signals are transmitted and received, so if the Spcell is dormant or deactivated, the connection with the base station is disconnected, so it must always remain activated.

-It is characterized by being unable to transition to the dormant state if PUCCH is set although it is Scell. It should be activated because there may be other cells that need to send feedback such as HARQ ACK/NACK to PUCCH.

-Due to the above characteristics, the cell deactivation timer (ScellDeactivationTimer) can also be driven only for other Scells if it is not applied to the spcell and PUCCH-configured Scell.

-The cell sleep timer (ScellHibernationTimer) takes priority over the cell deactivation timer (ScellDeactivationTimer). In addition, when one value is set as the RRC message, the same value may be applied to all cells. As another method, the base station may set different timer values for each Scell or for each BWP by considering characteristics of each cell or each BWP.

-If the Scell is not indicated to be activated or dormant in the RRC message, it may be characterized in that it initially operates in an inactive state.

As a first embodiment of the present invention, in the next-generation mobile communication system using partial bandwidth, when applying the activated state or the deactivated state or the dormant state proposed by the present invention, operation of each cell (Scell) and partial bandwidth according to each state I suggest as follows.

The first embodiment of the present invention is characterized in that it operates in an activated state or an inactive state or a dormant state, and performs the unit transition in units of Scells. It is characterized in that one of the partial bandwidths (the specified partial bandwidth (for example, the first activated partial bandwidth) or the activated partial bandwidth or the last used partial bandwidth) performs a state transition according to the state transition of the Scell. For example, when the Scell transitions from the active state to the dormant state, the first active downlink/uplink BWP among the plurality of partial bandwidths belonging to the Scell may transition to the dormant state. . Because the first active uplink/downlink partial bandwidth set by RRC will be activated when the partial bandwidth that was in the inactive state or the dormant state transitions to the active state, the channel measurement report is first activated in the dormant state. This is because it is efficient to perform in the link partial bandwidth.

1H is a diagram illustrating a partial bandwidth state transition method through Scell unit state transition proposed in the present invention.

In the first embodiment of the present invention, it is characterized in that it is performed in units of Scells when operating an activated state or an inactive state or a dormant state as shown in FIG. 1H and performing state transition. One of the plurality of partial bandwidths belonging to (the specified partial bandwidth (for example, the first activated partial bandwidth) or the activated partial bandwidth or the last used partial bandwidth) performs a state transition according to the state transition of the Scell It is characterized by.

As shown in FIG. 1H, the Pcell 1h-10 may be always activated so that the radio link between the base station and the terminal is not broken. In the case of an FDD system in each cell (Pcell or Scells), frequencies for downlink and uplink may be divided, and a plurality of partial bandwidths may be set for downlink and uplink, respectively.

The present invention is characterized in that only one partial bandwidth for each downlink or uplink for each Scell can have an active state or a dormant state, and the other partial bandwidth poles are in an inactive state. That is, in the present invention, even if the state transition is performed in units of Scells, only one partial bandwidth per uplink or downlink can perform the same state transition according to the state transition of the Scell and perform the corresponding partial bandwidth operation. have.

For example, as shown in FIG. 1H, the base station may set the first Scell (1h-20), the second Scell (1h-30), and the third Scell (1h-40) to the UE.

If the base station transitions the first Scell (1h-20) to the dormant state with an RRC message or MAC CE, the UE performs one partial bandwidth (1h) among a plurality of partial bandwidths set for the downlink to the first Scell. -21, for example, the first active downlink partial bandwidth) may be transitioned to a dormant state and other downlink partial bandwidths may be operated in an inactive state. In addition, the UE transitions one partial bandwidth (1h-22, for example, the first activated uplink partial bandwidth) from the plurality of partial bandwidths set for the uplink to the first Scell to the dormant state and the other uplink portion Bandwidths can be made inactive.

If the base station transitions the second Scell (1h-30) to an inactive state with an RRC message or MAC CE, the UE transmits one partial bandwidth (1h-) among the plurality of partial bandwidths set for the downlink to the second Scell. 31, for example, a partial bandwidth that was previously activated or dormant) may be transitioned to an inactive state, and other downlink partial bandwidths may be operated in an inactive state. In addition, the UE transitions one partial bandwidth (1h-32, for example, a partial bandwidth that was previously activated or dormant) to an inactive state among a plurality of partial bandwidths set for uplink to the second Scell. Other uplink partial bandwidths can be made to operate in an inactive state.

If the base station transitions the third Scell (1h-40) to an active state with an RRC message or MAC CE, the UE transmits one partial bandwidth (1h-) among a plurality of partial bandwidths set for the downlink to the first Scell. 41, for example, the first active downlink partial bandwidth) transitions to the activated state, and other downlink partial bandwidths can be operated in an inactive state. In addition, the UE transitions one partial bandwidth (1h-42, for example, the first activated uplink partial bandwidth) among the plurality of partial bandwidths set for the uplink to the first Scell to the activated state and the other uplink partial bandwidth. Can make them work in an inactive state.

In the following, the present invention proposes a state transition operation for the Scell and a state transition operation for a downlink or uplink partial bandwidth belonging to the Scell when the base station instructs the terminal of the state transition in units of Scells as described above.

-(Scell Activation / Partial Bandwidth Activation) When the MAC layer device receives a MAC CE to activate for an Scell or an RRC message to activate, some or all of the following plurality of operations may be performed.

■ Activate the Scell, and activate the downlink partial bandwidth and uplink partial bandwidth described above among the plurality of partial bandwidths of the Scell.

■ In the Scell (or activated partial bandwidth), a base station transmits a sounding reference signal (SRS) to perform channel measurement for uplink. For example, it can be transmitted periodically.

■ In the Scell (or activated partial bandwidth), the UE may report a channel measurement result (CSI or CQI or PMI or RI or PTI or CRI) according to a base station setting for downlink.

■ Monitor the PDCCH to read the instructions of the base station from the Scell (or activated partial bandwidth).

■ Monitor the PDCCH to read the cross-scheduling for the Scell (or activated partial bandwidth).

■ If PUCCH is set in the Scell (or an activated partial bandwidth), PUCCH transmission is performed.

■ If the Scell was deactivated before receiving the instruction to activate the Scell (or the Scell was dormant before receiving the instruction to activate the Scell above)

◆ The first activated downlink partial bandwidth (indicated by firstActiveDownlinkBWP-Id) and the first activated uplink partial bandwidth (firstActiveUplinkBWP) indicated in the RRC message respectively for the downlink partial bandwidth (DL BWP) and the uplink partial bandwidth (UL BWP) of the Scell. -id).

■ Start or restart the cell deactivation timer (sCellDeactivationTimer) for the Scell. Alternatively, the cell deactivation timer can be started or restarted only when the cell sleep timer is not set.

■ If there is a type 1 configuration transmission resource that has been discontinued, the stored type 1 transmission resource configuration can be initialized or re-initialized and used. In the above, the type 1 configuration transmission resource is a periodic transmission resource (uplink or downlink) allocated in advance as an RRC message and means a transmission resource that can be activated and used as an RRC message.

■ If the cell sleep timer (sCellHibernationTimer) is set in the cell

◆ Start or restart the cell sleep timer (sCellHibernationTimer) for the Scell.

■ PHR is triggered for the Scell.

-(Scell deactivation or partial bandwidth deactivation) When MAC layer device receives MAC CE to deactivate for some Scell or RRC message to deactivate

-Or, if the cell deactivation timer for the activated Scell has expired and the cell dormancy timer has not been set (if the cell dormancy timer is set, the cell inactivation timer has to be prioritized, so the cell inactivation timer expires) In other words, if the cell sleep timer is set, the cell state transition must first transition from the active state to the dormant state, and then from the dormant state to the inactive state.)

■ The terminal may perform some or all of the following plurality of operations.

■ Disable the Scell (or partial bandwidth of the Scell).

■ Stop the cell deactivation timer set in the Scell.

■ Stop the partial bandwidth deactivation timer set for the Scell.

■ If there is a partial bandwidth set and activated in the Scell, deactivate it.

■ If there is a partial bandwidth set and dormant in the Scell, deactivate it.

■ The periodic downlink transmission resource (DL SPS or configured downlink assignment) set in the Scell or the set periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) may be cleared. In the above, clearing means that the terminal stores the setting information such as the cycle information set in the RRC message, but removes information on the periodic transmission resource indicated or activated by L1 signaling (for example, DCI). This means that it is no longer used. The periodic transmission resource may be referred to as a type 2 configuration transmission resource. In addition, the operation of releasing the periodic transmission resource may be performed only when the Scell transitions from an activated state to an inactive state. This is because when there is a transition from the dormant state to the inactive state, there is no periodic transmission resource in the dormant state, so there is no need to release it. As another method, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is set or exists.

■ If there is a PUSCH transmission resource configured for periodic channel measurement information (semi-persistent CSI reporting) for the Scell, it is cleared.

■ The periodic uplink transmission resource (configured uplink grant Type 1 configured as RRC) set in the Scell may be suspended. In the above, the meaning of suspend means that the terminal stores the transmission resource configuration information set in the RRC message, but does not use it anymore. The periodic transmission resource may be referred to as a type 1 configuration transmission resource.

■ Empty all HARQ buffers set for the Scell.

-If the PDCCH in some activated Scell indicates that there is downlink data (downlink assignment) or uplink transmission resource allocation (Uplink grant)

-Or, in a serving cell scheduling for an activated Scell, if the PDCCH indicates that there is downlink data for the activated Scell (downlink assignment) or allocates uplink transmission resources (Uplink grant)

-Or, for the activated set Scell, if any MAC PDU is transmitted in a preset downlink transmission resource (configured downlink assignment) or a preset uplink transmission resource (configured uplink grant)

■ The terminal restarts the cell deactivation timer running for the Scell. Alternatively, the cell deactivation timer can be restarted only if cell sleep is not set.

■ If the cell sleep timer is set for the Scell,

◆ Restart the cell sleep timer.

-If any Scell or partial bandwidth of the Scell is inactive or inactive

■ The terminal does not transmit the SRS for the Scell (or partial bandwidth of the Scell).

■ In the Scell (or partial bandwidth of the Scell), the UE does not perform channel measurement (CSI or CQI or PMI or RI or PTI or CRI) on the downlink (Do0wnlink) and does not report.

■ The uplink data is not transmitted to the UL-SCH in the Scell (or partial bandwidth of the Scell).

■ The random access procedure is not performed on the Scell (or the partial bandwidth of the Scell).

■ In the Scell (or partial bandwidth of the Scell), the UE does not monitor the PDCCH.

■ The UE does not monitor the PDCCH for the Scell (or partial bandwidth of the Scell). For example, in the case of cross-scheduling, the PDCCH for the Scell is not monitored in the cell to be scheduled.

■ PUCCH or SPUCCH transmission is not performed on the Scell.

-When the Scell is deactivated, if there is a random access procedure in progress in the Scell, it is canceled.

-The dormant state does not apply to Spcell or Scell with PUCCH set.

The MAC layer device can operate two timers to efficiently operate the sleep state of the Scell.

-Cell hibernation timer (sCellHibernationTimer): The cell hibernation timer is driven on the Scell set to the UE, but not on the Scell on which the PUCCH is set. When the cell sleep timer expires, the MAC layer device transitions the Scell in the active state to the sleep state. That is, the cell sleep timer can be applied only to the activated Scell. One value set as RRC applies equally to the cell sleep timer of each Scell. In addition, the cell sleep timer takes priority over the cell deactivation timer. That is, the cell sleep timer is set, and if it is running, the cell deactivation timer does not transition to the deactivated state even if the cell deactivation timer is driven or expired, and the cell deactivation timer does not affect the Scell.

-Dormant cell deactivation timer (dormantScellDeactivationTimer): The dormant cell deactivation timer is driven on the Scell set to the UE, but not on the Scell on which the PUCCH is set. When the dormant cell inactivity timer expires, the MAC layer device transitions the Scell in the dormant state to the inactive state. One value set as RRC applies equally to the dormant state cell inactivity timer of each Scell. That is, the dormant state cell deactivation timer is applied only to the Scell in the dormant state.

-When the Scell is set, if the RRC message indicates the sleep state, the terminal may transition the Scell to the sleep state. In the case of handover or SCG change, if the dormant state is indicated in the Scell state setting of the RRC message, the Scell may transition to the dormant state.

-If the MAC layer device is instructed to sleep when receiving an Scell configuration through an RRC message, or if it receives a MAC CE indicating that the Scell should transition to the dormant state,

■ The terminal may perform some or all of the following plurality of operations.

■ Transition the Scell (or partial bandwidth of the Scell) to a dormant state.

■ Stop the cell deactivation timer set or running in the Scell (or partial bandwidth of the Scell).

■ If the cell sleep timer is set in the Scell (or the partial bandwidth of the Scell), the cell sleep timer is stopped.

■ Start or restart the dormant cell deactivation timer in the Scell (or partial bandwidth of the Scell).

■ Stop the partial bandwidth deactivation timer set for the Scell (or partial bandwidth of the Scell). This is to prevent unnecessary partial bandwidth switching procedure in the Scell.

■ For the Scell, the downlink partial bandwidth is dormant and channel measurement is performed and reported. The uplink partial bandwidth of the Scell may be deactivated and not used. This is because the Scell in the dormant state performs channel measurement only for the downlink partial bandwidth, and the measurement result is reported as the uplink partial bandwidth of the Scell with Spcell (Pcell or Pscell) or PUCCH.

The first time the Rcell message indicated the downlink partial bandwidth (DL BWP) or uplink partial bandwidth (UL BWP) of the Scell because the transition to the dormant state was indicated for the Scell (or the partial bandwidth of the Scell), respectively. It is dormant to the active downlink partial bandwidth (indicated by firstActiveDownlinkBWP-Id) or the first active uplink partial bandwidth (indicated by firstActiveUplinkBWP-id). Because the first active uplink/downlink partial bandwidth set by RRC will be activated when the partial bandwidth that was in the inactive state or the dormant state transitions to the active state, the channel measurement report is first activated in the dormant state. This is because it is efficient to perform in the link partial bandwidth. As another method, when transitioning to the dormant state, only the downlink partial bandwidth may be switched to the first active downlink partial bandwidth and dormant. This is because when activating the Scell, the uplink partial bandwidth is also switched to the first activated uplink partial bandwidth and activated. If the partial bandwidth that was active in the Scell before the sleep state was indicated in the above was originally the first active downlink or uplink partial bandwidth, it may be dormant without performing a switching operation.

■ Clear the periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) set in the Scell (or partial bandwidth of the Scell) (clear) can do. In the above, clearing means that the terminal stores the setting information such as the cycle information set in the RRC message, but removes information on the periodic transmission resource indicated or activated by L1 signaling (for example, DCI). This means that it is no longer used. The proposed method, that is, the operation of clearing the set periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant) is activated by the Scell. It can also be performed only when transitioning from the state to the dormant state. This is because when the Scell transitions from the inactive state to the dormant state, there is no information on the periodic transmission resource information indicated or activated by L1 signaling. As another method, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is set or there is.

■ The periodic uplink transmission resource (configured uplink grant Type 1 configured as RRC) set in the Scell (or partial bandwidth of the Scell) may be suspended. In the above, the meaning of suspend means that the terminal stores the transmission resource configuration information set in the RRC message, but does not use it anymore. The proposed method, that is, the operation of suspending the configured periodic uplink transmission resource (configured uplink grant Type 1) may be performed only when the Scell transitions from the activated state to the dormant state. This is because when the Scell transitions from the inactive state to the dormant state, periodic transmission resources are not used. As another method, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is set or exists.

■ Empty all HARQ buffers set in the Scell.

-If the cell sleep timer expires in the activated Scell (or partial bandwidth of the Scell)

■ The terminal transitions the Scell (or partial bandwidth of the Scell) to a dormant state.

■ The terminal stops the cell deactivation timer set or running in the Scell (or partial bandwidth of the Scell).

■ The terminal stops the cell sleep timer set or running in the Scell (or the partial bandwidth of the Scell).

■ The terminal starts or restarts the sleep cell deactivation timer in the Scell (or partial bandwidth of the Scell).

■ Clear the periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) set in the Scell (or partial bandwidth of the Scell) (clear) can do. In the above, clearing means that the terminal stores the setting information such as the cycle information set in the RRC message, but removes information on the periodic transmission resource indicated or activated by L1 signaling (for example, DCI). This means that it is no longer used. The proposed method, that is, the operation of clearing the set periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant) is activated by the Scell. It can also be performed only when transitioning from the state to the dormant state. This is because when the Scell transitions from the inactive state to the dormant state, there is no information on the periodic transmission resource information indicated or activated by L1 signaling. As another method, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is set or exists.

-If the sleep state cell deactivation timer set in the sleep state Scell has expired

■ Transmit the Scell (or partial bandwidth of the Scell) to an inactive state.

■ Stop the dormant cell deactivation timer of the Scell (or partial bandwidth of the Scell).

-If the Scell (or partial bandwidth of the Scell) is in the dormant state

■ The terminal does not transmit the SRS for the Scell (or partial bandwidth of the Scell).

■ In the Scell (or partial bandwidth of the Scell), the UE performs channel measurement (CSI or CQI or PMI or RI or PTI or CRI, etc.) according to the setting of the base station for downlink and performs measurement report. . For example, it is possible to periodically perform channel or frequency measurement reporting.

■ The uplink data is not transmitted to the UL-SCH in the Scell (or partial bandwidth of the Scell).

■ The random access procedure is not performed on the Scell (or the partial bandwidth of the Scell).

■ In the Scell (or partial bandwidth of the Scell), the UE does not monitor the PDCCH.

■ The UE does not monitor the PDCCH for the Scell (or partial bandwidth of the Scell). For example, in the case of cross-scheduling, the PDCCH for the Scell is not monitored in the cell to be scheduled.

■ PUCCH or SPUCCH transmission is not performed on the Scell (or partial bandwidth of the Scell).

■ For the Scell, the downlink partial bandwidth is dormant and channel measurement is performed and reported. The uplink partial bandwidth of the Scell may be deactivated and not used. This is because the Scell in the dormant state performs channel measurement only for the downlink partial bandwidth, and the measurement result is reported as the uplink partial bandwidth of the Scell with Spcell (Pcell or Pscell) or PUCCH.

The first time the Rcell message indicated the downlink partial bandwidth (DL BWP) or uplink partial bandwidth (UL BWP) of the Scell because the transition to the dormant state was indicated for the Scell (or the partial bandwidth of the Scell), respectively. It is dormant to the active downlink partial bandwidth (indicated by firstActiveDownlinkBWP-Id) or the first active uplink partial bandwidth (indicated by firstActiveUplinkBWP-id). Because the first active uplink/downlink partial bandwidth set by RRC will be activated when the partial bandwidth that was in the inactive state or the dormant state transitions to the active state, the channel measurement report is first activated in the dormant state. This is because it is efficient to perform in the link partial bandwidth. As another method, when transitioning to the dormant state, only the downlink partial bandwidth may be switched to the first active downlink partial bandwidth and dormant. This is because when activating the Scell, the uplink partial bandwidth will also be switched to the first activated uplink partial bandwidth and activated. If the partial bandwidth that was activated in the Scell before the sleep state was indicated in the above was originally the first active downlink or uplink partial bandwidth, it may be dormant without performing a switching operation.

■ Clear the periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) set in the Scell (or partial bandwidth of the Scell) (clear) can do. In the above, clearing means that the terminal stores the setting information such as the cycle information set in the RRC message, but removes information on the periodic transmission resource indicated or activated by L1 signaling (for example, DCI). This means that it is no longer used. The proposed method, that is, the operation of clearing the set periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant) is activated by the Scell. It can also be performed only when transitioning from the state to the dormant state. This is because when the Scell transitions from the inactive state to the dormant state, there is no information on the periodic transmission resource information indicated or activated by L1 signaling.

■ The periodic uplink transmission resource (configured uplink grant Type 1 configured as RRC) set in the Scell (or partial bandwidth of the Scell) may be suspended. In the above, the meaning of suspend means that the terminal stores the transmission resource configuration information set in the RRC message, but does not use it anymore. The proposed method, that is, the operation of suspending the configured periodic uplink transmission resource (configured uplink grant Type 1) may be performed only when the Scell transitions from the activated state to the dormant state. This is because when the Scell transitions from the inactive state to the dormant state, periodic transmission resources are not used.

-If there is an ongoing random access procedure when the Scell transitions to the dormant state, cancel it.

In the following of the present invention, as a second embodiment of the present invention, an activation state or deactivation proposed by the present invention in a system (for example, a UMTS or LTE system) that uses a fixed frequency bandwidth in each frequency band without using a partial bandwidth. When applying a state or a dormant state, the operation of each cell according to each state is proposed as follows.

-(Scell activation) If the MAC layer device receives a MAC CE to activate for an Scell or an RRC message to activate, some or all of the following plurality of operations may be performed.

■ Activate the Scell.

■ The Scell transmits a sounding reference signal (SRS) so that the base station can perform channel measurement for uplink. For example, it can be transmitted periodically.

■ In the Scell, the UE may report a channel measurement result (CSI or CQI or PMI or RI or PTI or CRI, etc.) according to a base station setting for downlink.

■ The PDCCH is monitored to read the instructions of the base station from the Scell.

■ Monitor the PDCCH to read the cross scheduling for the Scell.

■ If PUCCH is configured in the Scell, PUCCH transmission is performed.

■ Start or restart the cell deactivation timer (sCellDeactivationTimer) for the Scell. (Alternatively, you can start or restart the cell deactivation timer only if the cell sleep timer is not set)

■ If the cell sleep timer (sCellHibernationTimer) is set in the cell

◆ Start or restart the cell sleep timer (sCellHibernationTimer) for the Scell.

■ PHR is triggered for the Scell.

-(Scell deactivation) When MAC layer device receives MAC CE to deactivate for some Scell or RRC message to deactivate

-Or, if the cell deactivation timer for the activated Scell has expired and the cell dormancy timer has not been set (if the cell dormancy timer is set, the cell inactivation timer has to be prioritized, so the cell inactivation timer expires) In other words, if the cell sleep timer is set, the cell state transition must first transition from the active state to the dormant state, and then from the dormant state to the inactive state.)

-The terminal may perform some or all of the following plurality of operations.

■ Deactivate the Scell.

■ Stop the cell deactivation timer that has set the Scell.

■ The periodic downlink transmission resource (DL SPS or configured downlink assignment) set in the Scell or the set periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) may be cleared. In the above, clearing means that the terminal stores the setting information such as the cycle information set in the RRC message, but removes information on the periodic transmission resource indicated or activated by L1 signaling (for example, DCI). This means that it is no longer used. In addition, the operation of releasing the periodic transmission resource may be performed only when the Scell transitions from an activated state to an inactive state. This is because when there is a transition from the dormant state to the inactive state, there is no periodic transmission resource in the dormant state, so there is no need to release it. As another method, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is set or exists.

■ If there is a PUSCH transmission resource configured for periodic channel measurement information (semi-persistent CSI reporting) for the Scell, it is cleared.

■ Empty all HARQ buffers set for the Scell.

-If any Scell is inactive or inactive

■ The terminal does not transmit the SRS for the Scell.

■ In the Scell, the UE does not perform channel measurement (CSI or CQI or PMI or RI or PTI or CRI) on the downlink and does not report.

■ The Scell does not transmit uplink data to the UL-SCH.

■ The random access procedure is not performed on the Scell.

■ In the Scell, the UE does not monitor the PDCCH.

■ The UE does not monitor the PDCCH for the Scell. For example, in the case of cross-scheduling, the PDCCH for the Scell is not monitored in the cell to be scheduled.

■ PUCCH or SPUCCH transmission is not performed on the Scell.

-If the PDCCH in some activated Scell indicates that there is downlink data (downlink assignment) or uplink transmission resource allocation (Uplink grant)

-Or, in a serving cell scheduling for an activated Scell, if the PDCCH indicates that there is downlink data for the activated Scell (downlink assignment) or allocates uplink transmission resources (Uplink grant)

-Or, for the activated set Scell, if any MAC PDU is transmitted in a preset downlink transmission resource (configured downlink assignment) or a preset uplink transmission resource (configured uplink grant)

■ The terminal restarts the cell deactivation timer running for the Scell. (In another way, the cell deactivation timer can be restarted only if cell sleep is not set).

■ If the cell sleep timer is set for the Scell,

◆ Restart the cell sleep timer.

-When the Scell is deactivated, if there is a random access procedure in progress in the Scell, it is canceled.

The MAC layer device can operate two timers to efficiently operate the sleep state of the Scell.

-Cell hibernation timer (sCellHibernationTimer): The cell hibernation timer is driven on the Scell set to the UE, but not on the Scell on which the PUCCH is set. When the cell sleep timer expires, the MAC layer device transitions the Scell in the active state to the sleep state. That is, the cell sleep timer can be applied only to the activated Scell. One value set as RRC applies equally to the cell sleep timer of each Scell. In addition, the cell sleep timer takes priority over the cell deactivation timer. That is, the cell sleep timer is set, and if it is running, the cell deactivation timer does not transition to the deactivated state even if the cell deactivation timer is driven or expired, and the cell deactivation timer does not affect the Scell.

-Dormant cell deactivation timer (dormantScellDeactivationTimer): The dormant cell deactivation timer is driven on the Scell set to the UE, but not on the Scell on which the PUCCH is set. When the dormant cell inactivity timer expires, the MAC layer device transitions the Scell in the dormant state to the inactive state. One value set as RRC applies equally to the dormant state cell inactivity timer of each Scell. That is, the dormant state cell deactivation timer is applied only to the Scell in the dormant state.

When the Scell is set, if the RRC message indicates the sleep state, the terminal may transition the Scell to the sleep state. In the case of handover or SCG change, if the dormant state is indicated in the Scell state setting of the RRC message, the Scell may transition to the dormant state.

-(Scell dormant) If the MAC layer device is instructed to dormant when receiving an Scell configuration with an RRC message, or if it has received MAC CE indicating to transition the Scell to dormant state.

-The terminal may perform some or all of the following plurality of operations.

■ Transition the Scell to the dormant state.

■ Stop the cell deactivation timer set or running in the Scell.

■ If the cell sleep timer is set in the cell, the cell sleep timer is stopped.

■ Start or restart the sleep cell deactivation timer in the Scell.

■ The periodic downlink transmission resource (DL SPS or configured downlink assignment) set in the Scell or the set periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) may be cleared. In the above, clearing means that the terminal stores the setting information such as the cycle information set in the RRC message, but removes information on the periodic transmission resource indicated or activated by L1 signaling (for example, DCI). This means that it is no longer used. The proposed method, that is, the operation of clearing the set periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant) is activated by the Scell. It can be performed only when transitioning from the state to the dormant state. This is because when the Scell transitions from the inactive state to the dormant state, there is no information on the periodic transmission resource information indicated or activated by L1 signaling. As another method, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is set or exists.

■ Empty all HARQ buffers set in the Scell.

-If the cell sleep timer expires on the activated Scell

■ The terminal transitions the Scell to the dormant state.

■ The terminal stops the cell deactivation timer set or running in the Scell.

■ The terminal stops the cell sleep timer set or running in the Scell.

■ The terminal starts or restarts the sleep cell deactivation timer in the Scell.

■ The periodic downlink transmission resource (DL SPS or configured downlink assignment) set in the Scell or the set periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) may be cleared. In the above, clearing means that the terminal stores the setting information such as the cycle information set in the RRC message, but removes information on the periodic transmission resource indicated or activated by L1 signaling (for example, DCI). This means that it is no longer used. The proposed method, that is, the operation of clearing the set periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant) is activated by the Scell. It can be performed only when transitioning from the state to the dormant state. This is because when the Scell transitions from the inactive state to the dormant state, there is no information on the periodic transmission resource information indicated or activated by L1 signaling. As another method, the periodic transmission resources may be released only when the periodic downlink transmission resource or the periodic uplink transmission resource is set or exists.

-If the sleep state cell deactivation timer set in the sleep state cell has expired

■ Transition the Scell to an inactive state.

■ The cell deactivation timer of the Scell is stopped.

-If the Scell is in a dormant state

■ The terminal does not transmit the SRS for the Scell.

■ In the Scell, the UE performs channel measurement (CSI or CQI or PMI or RI or PTI or CRI, etc.) according to the setting of the base station for downlink and performs measurement reporting. For example, it is possible to periodically perform channel or frequency measurement reporting.

■ The Scell does not transmit uplink data to the UL-SCH.

■ The random access procedure is not performed on the Scell.

■ In the Scell, the UE does not monitor the PDCCH.

■ The UE does not monitor the PDCCH for the Scell. For example, in the case of cross-scheduling, the PDCCH for the Scell is not monitored in the cell to be scheduled.

■ PUCCH or SPUCCH transmission is not performed on the Scell.

■ The periodic downlink transmission resource (DL SPS or configured downlink assignment) set in the Scell or the set periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) may be cleared. In the above, clearing means that the terminal stores the setting information such as the cycle information set in the RRC message, but removes information on the periodic transmission resource indicated or activated by L1 signaling (for example, DCI). This means that it is no longer used. The proposed method, that is, the operation of clearing the set periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant) is activated by the Scell. It can be performed only when transitioning from the state to the dormant state. This is because when the Scell transitions from the inactive state to the dormant state, there is no information on the periodic transmission resource information indicated or activated by L1 signaling.

-If there is an ongoing random access procedure when the Scell transitions to the dormant state, cancel it.

-The dormant state does not apply to Spcell or Scell with PUCCH set.

Next, the present invention proposes a state transition MAC control element (MAC control element) indicating each of the Scells in an activated state, a dormant state, or an inactive state.

1I is a diagram illustrating MAC control information indicating a state transition to an activated state, a dormant state, or an inactive state proposed in the present invention.

The activation and deactivation MAC CE proposed in the present invention may have the structure shown in FIG. 1i as an embodiment, and the MAC CE structure (1i-05) and 31 structures having a size of 1 byte supporting 7 Scells. It can be divided into a MAC CE structure (1i-10) having a size of 4 bytes supporting Scell. And it has the following features.

-When the dormant MAC CE is not received and only the activated and deactivated MAC CE is received, the terminal operation is as follows.

■ Activation and Deactivation When each field of MAC CE indicates each Scell identifier, a value corresponding to each field indicates whether the Scell is activated or deactivated. If the value of the indicator is 1 for the Scell indicated by the Scell identifier, the Scell is activated when the status of the Scell is inactive. However, if the state of the Scell is other than the inactive state, the indicator value is ignored. If the value of the indicator is 0 for the Scell indicated by the Scell identifier, the Scell is deactivated. That is, if the value of the indicator for the Scell is 0 regardless of the state of the Scell, the Scell is deactivated.

The dormant MAC CE proposed in the present invention may have a structure shown in FIG. 1i as an embodiment, and the dormant MAC CE has a MAC CE structure having a size of 1 byte supporting 7 Scells (1i-05) And MAC CE structure (1i-05) having a size of 4 bytes supporting 31 Scells. And it has the following features.

-When the activation and deactivation MAC CE is not received and only the dormant MAC CE is received, the terminal operation is as follows.

■ Dormantization When each field of MAC CE represents each Scell identifier, a value corresponding to each field indicates whether the Scell is activated or dormant. If the value of the indicator is 1 for the Scell indicated by the Scell identifier, the Scell is dormant. That is, regardless of what the status of the Scell is, if the indicator value for the Scell is 1, the Scell is dormant. If the value of the indicator is 0 for the Scell indicated by the Scell identifier, the Scell is activated when the state of the Scell is in the dormant state. However, if the state of the Scell is other than the dormant state, the indicator value is ignored.

-When activated and deactivated MAC CE and dormant MAC CE are simultaneously received by one MAC layer device, the terminal operation is as follows.

■ Activation and Deactivation Each field of MAC CE and dormant MAC CE indicates an identifier of each Scell, and a combination of values corresponding to each field indicates a state transition such as activation or dormancy or deactivation of the Scell. The activated and deactivated MAC CE and the dormant MAC CE can be received with MAC CEs having a size of 1 byte or MAC CEs having a size of 4 bytes in one MAC layer device. When the two types of MAC CEs are received together, the state transition of each Scell indicated by the MAC CEs may be determined according to a combination of indication values of each MAC CE as shown in the following table.

1J is a diagram illustrating a terminal operation for performing state transition on a cell set in a terminal in the present invention.

In FIG. 1J, the base station may configure a plurality of Scells together with a Spcell (Pcell or Pscell) to the UE.

If the set cell is a Spcell (1j-05), the Spcell can always remain activated with the indication of the base station (1j-10), and if the set cell is an Scell (1j-05), the indication or cell of the base station The state transition may be performed according to the expiration of the timer set at. For example, if the base station instructs a state transition for a certain cell with an RRC message or MAC CE, or if a timer set by the base station expires for a certain cell and a state transition operation of a certain cell is triggered, the UE activates the cell. Alternatively, the state transition to the dormant state or the deactivated state may be performed, and operations suitable for each of the states proposed above may be performed (1j-25, 1j-30, 1j-35).

1K illustrates a structure of a terminal to which an embodiment of the present invention can be applied.

Referring to the drawings, the terminal includes a radio frequency (RF) processor 1k-10, a baseband, a processor 1k-20, a storage 1k-30, and a controller 1k-40 do.

The RF processor 1k-10 performs a function for transmitting and receiving signals through a wireless channel such as band conversion and amplification of signals. That is, the RF processing unit 1k-10 converts the baseband signal provided from the baseband processing unit 1k-20 to an RF band signal, transmits it through an antenna, and transmits an RF band signal through the antenna. Downconverts to baseband signal. For example, the RF processing unit 1k-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), and an analog to digital converter (ADC). Can. In the figure, only one antenna is shown, but the terminal may have multiple antennas. In addition, the RF processor 1k-10 may include a plurality of RF chains. Furthermore, the RF processing unit 1k-10 may perform beamforming. For the beamforming, the RF processor 1k-10 may adjust the phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements. In addition, the RF processor may perform MIMO, and may receive multiple layers when performing MIMO operations. The RF processing unit 1k-10 may perform reception beam sweeping by appropriately setting a plurality of antennas or antenna elements under the control of the control unit, or adjust the direction and beam width of the reception beam so that the reception beam is coordinated with the transmission beam. have.

The baseband processor 1k-20 performs a conversion function between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the baseband processor 1k-20 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processor 1k-20 restores the received bit stream through demodulation and decoding of the baseband signal provided from the RF processor 1k-10. For example, in the case of conforming to the orthogonal frequency division multiplexing (OFDM) method, when transmitting data, the baseband processor 1k-20 generates complex symbols by encoding and modulating a transmission bit stream, and sub-carriers the complex symbols. After mapping to, OFDM symbols are constructed through inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processing unit 1k-20 divides the baseband signal provided from the RF processing unit 1k-10 into units of OFDM symbols, and transmits data to subcarriers through fast Fourier transform (FFT) calculation. After restoring the mapped signals, the received bit stream is reconstructed through demodulation and decoding.

The baseband processor 1k-20 and the RF processor 1k-10 transmit and receive signals as described above. Accordingly, the baseband processor 1k-20 and the RF processor 1k-10 may be referred to as a transmitter, a receiver, a transceiver, or a communicator. Furthermore, at least one of the baseband processor 1k-20 and the RF processor 1k-10 may include a plurality of communication modules to support a plurality of different radio access technologies. In addition, at least one of the baseband processor 1k-20 and the RF processor 1k-10 may include different communication modules to process signals of different frequency bands. For example, the different radio access technologies may include LTE networks, NR networks, and the like. Also, the different frequency bands may include a super high frequency (SHF) band (eg, 2.5 GHz, 5 Ghz), and a millimeter wave (eg, 60 GHz) band.

The storage unit 1k-30 stores data such as a basic program, an application program, and setting information for the operation of the terminal. The storage unit 1k-30 provides data stored at the request of the control unit 1k-40.

The control unit 1k-40 controls overall operations of the terminal. For example, the control unit 1k-40 transmits and receives signals through the baseband processing unit 1k-20 and the RF processing unit 1k-10. Further, the control unit 1k-40 records and reads data in the storage unit 1k-40. To this end, the controller 1k-40 may include at least one processor. For example, the controller 1k-40 may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls an upper layer such as an application program.

1L shows a block configuration of TRP in a wireless communication system to which an embodiment of the present invention can be applied.

As shown in the figure, the base station includes an RF processor 1l-10, a baseband processor 1l-20, a backhaul communication unit 1l-30, a storage unit 1l-40, and a controller 1l-50 It is configured to include.

The RF processor 1l-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 1l-10 up-converts the baseband signal provided from the baseband processor 1l-20 to an RF band signal, transmits it through an antenna, and transmits an RF band signal through the antenna. Downconverts to baseband signal. For example, the RF processor 1l-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC. In the figure, only one antenna is shown, but the first access node may include multiple antennas. In addition, the RF processor 1l-10 may include a plurality of RF chains. Furthermore, the RF processing unit 1l-10 may perform beamforming. For the beamforming, the RF processor 1l-10 may adjust the phase and magnitude of each of signals transmitted and received through multiple antennas or antenna elements. The RF processing unit may perform a downlink MIMO operation by transmitting one or more layers.

The baseband processor 1l-20 performs a conversion function between a baseband signal and a bit stream according to a physical layer standard of the first wireless access technology. For example, during data transmission, the baseband processor 1l-20 encodes and modulates the transmission bit string to generate complex symbols. In addition, when receiving data, the baseband processor 1l-20 restores the received bit stream through demodulation and decoding of the baseband signal provided from the RF processor 1l-10. For example, according to the OFDM scheme, when transmitting data, the baseband processor 1l-20 generates complex symbols by encoding and modulating a transmission bit stream, mapping the complex symbols to subcarriers, and then IFFT OFDM symbols are configured through arithmetic and CP insertion. In addition, when receiving data, the baseband processor 1l-20 divides the baseband signal provided from the RF processor 1l-10 into units of OFDM symbols and restores signals mapped to subcarriers through FFT operation. After that, the received bit stream is restored through demodulation and decoding. The baseband processor 1l-20 and the RF processor 1l-10 transmit and receive signals as described above. Accordingly, the baseband processor 1l-20 and the RF processor 1l-10 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

The communication unit 1l-30 provides an interface for performing communication with other nodes in the network.

The storage unit 1l-40 stores data such as a basic program, an application program, and setting information for the operation of the main station. In particular, the storage unit 1l-40 may store information on bearers allocated to the connected terminal, measurement results reported from the connected terminal, and the like. In addition, the storage unit 1l-40 may store information serving as a criterion for determining whether to provide or stop multiple connections to the terminal. Then, the storage unit 1l-40 provides data stored at the request of the control unit 1l-50.

The controller 1l-50 controls overall operations of the main station. For example, the control unit 1l-50 transmits and receives signals through the baseband processing unit 1l-20 and the RF processing unit 1l-10 or through the backhaul communication unit 1l-30. In addition, the control unit 1l-50 records and reads data in the storage unit 1l-40. To this end, the controller 1l-50 may include at least one processor.

Hereinafter, the operation principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description, when it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

In the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Terms used to identify a connection node used in the following description, terms referring to network objects, terms referring to messages, terms referring to interfaces between network objects, terms referring to various identification information Etc. are exemplified for convenience of explanation. Therefore, the present invention is not limited to the terms described below, and other terms indicating objects having equivalent technical meanings may be used.

For convenience of description below, the present invention uses terms and names defined in the 3GPP 3rd Generation Partnership Project Long Term Evolution (LTE) standard. However, the present invention is not limited by the terms and names, and may be applied to systems conforming to other standards. In the present invention, the eNB may be used in combination with the gNB for convenience of explanation. That is, a base station described as an eNB may indicate gNB.

2A is a diagram showing the structure of an LTE system to which the present invention can be applied.

Referring to Figure 2a, the radio access network of the LTE system as shown in the next generation base station (Evolved Node B, hereinafter referred to as ENB, Node B or base station) (2a-05, 2a-10, 2a-15, 2a-20) It consists of MME (2a-25, Mobility Management Entity) and S-GW (2a-30, Serving-Gateway). User equipment (hereinafter referred to as UE or UE) 2a-35 accesses an external network through ENBs 2a-05 to 2a-20 and S-GW 2a-30.

In FIG. 2A, ENBs 2a-05 to 2a-20 correspond to existing Node Bs of the UMTS system. The ENB is connected to the UE (2a-35) through a radio channel and performs a more complicated role than the existing Node B. In the LTE system, all user traffic, including real-time services such as Voice over IP (VoIP) through the Internet protocol, are serviced through a shared channel, so status information such as buffer status of UEs, available transmission power status, channel status, etc. It is necessary to have a device that collects and schedules scheduling, and ENB (2a-05 to 2a-20) is responsible for this. One ENB usually controls multiple cells. For example, in order to realize a transmission speed of 100 Mbps, the LTE system uses, for example, an orthogonal frequency division multiplexing (OFDM) in a 20 MHz bandwidth as a radio access technology. In addition, an adaptive modulation & coding (hereinafter referred to as AMC) method is applied to determine a modulation scheme and a channel coding rate according to a channel state of a terminal. The S-GW 2a-30 is a device that provides a data bearer, and creates or removes a data bearer under the control of the MME 2a-25. MME is a device that is responsible for various control functions as well as mobility management functions for terminals, and is connected to multiple base stations.

2B is a diagram showing a radio protocol structure in an LTE system to which the present invention can be applied.

Referring to Figure 2b, the radio protocol of the LTE system is the PDCP (Packet Data Convergence Protocol 2b-05, 2b-40), RLC (Radio Link Control 2b-10, 2b-35), MAC (Medium Access) in the terminal and the ENB, respectively. Control 2b-15, 2b-30). PDCP (Packet Data Convergence Protocol) (2b-05, 2b-40) is responsible for IP header compression/restore. The main functions of PDCP are summarized as follows.

-Header compression and decompression (ROHC only)

-Transfer of user data

-In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM

-For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

-Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM

-Retransmission function (Retransmission of PDCP SDUs at handover and, for split bearers in DC, of PDCP PDUs at PDCP data-recovery procedure, for RLC AM)

-Encryption and decryption function (Ciphering and deciphering)

-Timer-based SDU discard function (Timer-based SDU discard in uplink.)

Radio link control (hereinafter referred to as RLC) (2b-10, 2b-35) reconfigures the PDCP packet data unit (PDU) to an appropriate size to perform ARQ operation and the like. The main functions of RLC are summarized as follows.

-Data transfer function (Transfer of upper layer PDUs)

-ARQ function (Error Correction through ARQ (only for AM data transfer))

-Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer)

-Re-segmentation of RLC data PDUs (only for AM data transfer)

-Reordering of RLC data PDUs (only for UM and AM data transfer)

-Duplicate detection (only for UM and AM data transfer)

-Error detection function (Protocol error detection (only for AM data transfer))

-RLC SDU deletion function (RLC SDU discard (only for UM and AM data transfer))

-RLC re-establishment

MAC (2b-15, 2b-30) is connected to several RLC layer devices configured in one terminal, and performs an operation of multiplexing RLC PDUs to MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC are summarized as follows.

-Mapping function (Mapping between logical channels and transport channels)

-Multiplexing and demultiplexing function (Multiplexing/demultiplexing of MAC SDUs belonging to one or different logical channels into/from transport blocks (TB) delivered to/from the physical layer on transport channels)

-Scheduling information reporting function

-HARQ function (Error correction through HARQ)

-Priority handling between logical channels (Priority handling between logical channels of one UE)

-Priority handling between UEs (Priority handling between UEs by means of dynamic scheduling)

-MBMS service identification function

-Transport format selection function

-Padding function

The physical layer (2b-20, 2b-25) channel-codes and modulates the upper layer data, makes it an OFDM symbol and transmits it to the radio channel, or demodulates and decodes the OFDM symbol received through the radio channel and delivers it to the upper layer. Do the action.

2C is a diagram showing the structure of a next-generation mobile communication system to which the present invention can be applied.

Referring to FIG. 2C, a radio access network of a next generation mobile communication system (hereinafter referred to as NR or 5G) is a next generation base station (New Radio Node B, NR gNB or NR base station) 2c-10 and NR CN (2c). -05, New Radio Core Network). The user terminal (New Radio User Equipment, NR UE or terminal) 2c-15 connects to the external network through the NR gNB 2c-10 and the NR CN 2c-05.

In FIG. 2C, NR gNB 2c-10 corresponds to an evolved node B (eNB) of an existing LTE system. The NR gNB is connected to the NR UE (2c-15) through a radio channel and can provide superior service than the existing Node B. In the next-generation mobile communication system, since all user traffic is serviced through a shared channel, a device is required to collect and schedule status information such as buffer status of UEs, available transmission power status, and channel status, and this is NR NB (2c-10) is in charge. One NR gNB usually controls multiple cells. In order to implement ultra-high-speed data transmission compared to the current LTE, it may have more than the existing maximum bandwidth, and orthogonal frequency division multiplexing (hereinafter referred to as OFDM) as a wireless access technology may additionally incorporate beamforming technology. . In addition, an adaptive modulation & coding (hereinafter referred to as AMC) method is applied to determine a modulation scheme and a channel coding rate according to a channel state of a terminal. NR CN (2c-05) performs functions such as mobility support, bearer setup, and QoS setup. NR CN is a device that is responsible for various control functions as well as mobility management functions for terminals, and is connected to multiple base stations. In addition, the next generation mobile communication system can be linked with the existing LTE system, and the NR CN is connected to the MME (2c-25) through a network interface. MME is connected to the existing base station eNB (2c-30).

2D is a diagram illustrating a radio protocol structure of a next-generation mobile communication system to which the present invention can be applied. .

Referring to Figure 2d, the radio protocol of the next-generation mobile communication system is NR SDAP (2d-01, 2d-45), NR PDCP (2d-05, 2d-40), NR RLC (2d-10) at the terminal and the NR base station, respectively. , 2d-35), NR MAC (2d-15, 2d-30).

The main functions of NR SDAP (2d-01, 2d-45) may include some of the following functions.

-Transfer of user plane data

-Mapping function between QoS flow and data bearer for uplink and downlink (mapping between a QoS flow and a DRB for both DL and UL)

-Marking QoS flow ID for both uplink and downlink (marking QoS flow ID in both DL and UL packets)

-Reflective QoS flow to DRB mapping for the UL SDAP PDUs for uplink SDAP PDUs.

For the SDAP layer device, the UE can set whether to use the header of the SDAP layer device or the function of the SDAP layer device, for each PDCP layer device, for each bearer, or for each logical channel, as an RRC message, and the SDAP header When is set, the NAS QoS reflection setting 1-bit indicator (NAS reflective QoS) of the SDAP header and the AS QoS reflection setting 1-bit indicator (AS reflective QoS) allow the UE to map the uplink and downlink QoS flow and mapping information for the data bearer. You can instruct it to update or reset. The SDAP header may include QoS flow ID information indicating QoS. The QoS information may be used as data processing priority and scheduling information to support a smooth service.

The main functions of NR PDCP (2d-05, 2d-40) may include some of the following functions.

-Header compression and decompression (ROHC only)

-Transfer of user data

-In-sequence delivery of upper layer PDUs

-Out-of-sequence delivery of upper layer PDUs

-Reordering function (PDCP PDU reordering for reception)

-Duplicate detection of lower layer SDUs

-Retransmission of PDCP SDUs

-Encryption and decryption function (Ciphering and deciphering)

-Timer-based SDU discard function (Timer-based SDU discard in uplink.)

In the above, the order reordering function of the NR PDCP device (reordering) refers to a function of reordering PDCP PDUs received from a lower layer in order based on a PDCP sequence number (SN), and transmitting data to a higher layer in the rearranged order. It may include or, without considering the order, may include a function to immediately deliver, may include a function to record the lost PDCP PDUs by rearranging the order, and report the status of the lost PDCP PDUs It may include a function for transmitting to the sender, and may include a function for requesting retransmission for lost PDCP PDUs.

The main functions of the NR RLC (2d-10, 2d-35) may include some of the following functions.

-Data transfer function (Transfer of upper layer PDUs)

-In-sequence delivery of upper layer PDUs

-Out-of-sequence delivery of upper layer PDUs

-ARQ function (Error Correction through ARQ)

-Concatenation, segmentation and reassembly of RLC SDUs

-Re-segmentation of RLC data PDUs

-Reordering of RLC data PDUs

-Duplicate detection function

-Protocol error detection

-RLC SDU deletion function (RLC SDU discard)

-RLC re-establishment

In the above, the in-sequence delivery of the NR RLC device refers to a function of sequentially transmitting RLC SDUs received from a lower layer to an upper layer, and one RLC SDU is originally divided into multiple RLC SDUs and received. If it is, it may include a function to reassemble and deliver it, and may include a function to rearrange the received RLC PDUs based on RLC sequence number (SN) or PDCP sequence number (SN). It may include a function of recording lost RLC PDUs, may include a function of reporting a status of lost RLC PDUs to a transmitting side, and a function of requesting retransmission of lost RLC PDUs. If there is a lost RLC SDU, it may include a function of forwarding only the RLC SDUs up to the previous layer in order until the lost RLC SDU, or if a predetermined timer expires even if there is a lost RLC SDU It may include a function of delivering all RLC SDUs received before the start to the upper layer in order, or if a predetermined timer expires even if there is a missing RLC SDU, all RLC SDUs received so far to the upper layer in order. It can include the ability to deliver. In addition, the RLC PDUs can be processed in the order in which they are received (regardless of the sequence number and sequence number, in order of arrival) and delivered to the PDCP device in any order (out-of sequence delivery). Thereafter, segments that are stored in a buffer or to be received at a later time can be received, reconstructed into a single RLC PDU, processed, and then transmitted to a PDCP device. The NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

In the above, out-of-sequence delivery of the NR RLC device refers to a function of directly transmitting RLC SDUs received from a lower layer to an upper layer regardless of order, and one RLC SDU originally has multiple RLCs. When divided and received into SDUs, it may include a function of reassembling it and transmitting it, and may include a function of storing RLC SNs or PDCP SNs of received RLC PDUs and arranging the order to record lost RLC PDUs. Can.

NR MAC (2d-15, 2d-30) may be connected to several NR RLC layer devices configured in one terminal, the main function of the NR MAC may include some of the following functions.

-Mapping function (Mapping between logical channels and transport channels)

-Multiplexing/demultiplexing of MAC SDUs

-Scheduling information reporting function

-HARQ function (Error correction through HARQ)

-Priority handling between logical channels (Priority handling between logical channels of one UE)

-Priority handling between UEs (Priority handling between UEs by means of dynamic scheduling)

-MBMS service identification function

-Transport format selection function

-Padding function

The NR PHY layer (2d-20, 2d-25) channel-codes and modulates the upper layer data, makes it an OFDM symbol and transmits it to a radio channel, or demodulates and decodes an OFDM symbol received through the radio channel to the upper layer You can perform the transfer operation.

The present invention proposes a method for quickly activating carrier aggregation in a next generation mobile communication system and saving a terminal battery.

The network or the base station may configure Spcells (Pcell and PScell) and a plurality of Scells to the UE. In the above, the Spcell indicates the Pcell when the terminal communicates with one base station, and when the terminal communicates with the two base stations (master base station and secondary base station), it can indicate the Pcell of the master base station or the PScell of the secondary base station. . In the above, Pcell or Pscell denotes a main cell used when a terminal and a base station communicate in each MAC layer device, sets timing to perform synchronization, performs random access, sends HARQ ACK/NACK feedback as a PUCCH transmission resource It means the cell that sends and receives most control signals. In the above, a technology in which a base station operates a plurality of Scells together with a Spcell to increase transmission resources and increase uplink or downlink data transmission resources is called carrier aggregation technology.

When the UE receives Spcell and a plurality of Scells, a mode may be set for each Scell. In the Scell mode, an active mode and a deactivated mode may be set. In the activation mode, the UE can send and receive uplink or downlink data with the base station in the activation mode Scell (or the activated partial bandwidth of the Scell), monitor the PDCCH to confirm the indication of the base station, and activate the mode The UE may perform channel measurement on the downlink of the Scell (or the activated partial bandwidth of the Scell) and periodically report the measurement information to the base station, and the UE may perform a pilot signal (sounding) so that the base station can perform the uplink channel measurement. Reference Signal, SRS) may be periodically transmitted to the base station.

However, in the deactivation mode, the UE cannot exchange data with the base station in the Scell, does not monitor the PDCCH to confirm the indication of the base station, does not perform channel measurement, does not perform measurement reporting, and transmits a pilot signal. I never do that.

Therefore, in order to activate the Scells in the inactive mode, the base station first sets the frequency measurement configuration information to the terminal through an RRC message, and the terminal performs cell or frequency measurement based on the frequency measurement configuration information. And the base station can activate the deactivated Scells based on the frequency/channel measurement information after receiving the cell or frequency measurement report of the terminal. This causes a lot of delay in the base station to activate the carrier aggregation technology to the terminal.

The present invention proposes a dormant mode for the Scell (or partial bandwidth) so as to reduce the delay and reduce the battery of the terminal.

In the dormant mode, the UE cannot exchange data with the base station in the dormant Scell (dormant Scell) or dormant partial bandwidth (dormant BWP (BandWidth Part)), and does not monitor the PDCCH to confirm the indication of the base station. However, it is characterized in that it does not transmit the pilot signal, but performs channel measurement and reports the measurement result for the measured frequency/cell/channel periodically or when an event occurs. Therefore, since the UE does not monitor the PDCCH in the dormant Scell or dormant partial bandwidth (BWP) and does not transmit a pilot signal, the UE can save battery compared to the activated mode, and the inactive mode and the moon perform channel measurement reporting. Therefore, the base station can use the carrier aggregation technology by quickly activating the dormant Scell or dormant partial bandwidth based on the measurement report based on the measurement report.

In the next generation mobile communication system, since a very high frequency band can be used, the frequency bandwidth may also be very wide. However, supporting a very wide bandwidth in a terminal implementation requires high implementation complexity and high cost. Therefore, in the next generation mobile communication system, the concept of a partial bandwidth (BWP) can be introduced, and a plurality of partial bandwidths (BWP) are set in one cell (Spcell or Scell), and one or more according to the instructions of the base station. Data can be transmitted and received over a partial bandwidth.

In the present invention, when introducing the sleep mode proposed in the present invention, it is characterized in that it proposes a state transition method and a specific operation in consideration of a plurality of partial bandwidths set in the Scell and the Scell. In addition, the method of managing the dormant mode in Scell-level (Scell-level) and the method of state transition and the method of managing and status-transfer in partial bandwidth unit (BWP-level) are proposed respectively, and each mode (enable or deactivate or dormant) We propose the operation of a specific partial bandwidth according to.

In addition, the present invention is characterized in that one or a plurality of partial bandwidths in one cell (Spcell or Pcell or Pscell or Scell) can be set to an active or dormant state. That is, a plurality of partial bandwidths of the one cell may be shifted to an active state, thereby increasing the data transmission rate in a manner similar to carrier aggregation technology. In addition, by shifting a plurality of partial bandwidths in a single cell to a dormant state, the UE can perform channel measurement and report the channel measurement results for the plurality of partial bandwidths. In addition, the battery of the terminal can be saved by shifting a plurality of partial bandwidths in an inactive state in the single cell. In the above, the state transition indication of a plurality of partial bandwidths for each cell may be set as an RRC message or downlink control information (DCI) of MAC CE or PDCCH.

In the present invention, the partial bandwidth (BWP) can be used without distinguishing the uplink and the downlink, and the meaning may indicate the uplink partial bandwidth and the downlink partial bandwidth, respectively, depending on the context.

2E is a diagram showing a procedure for service to a terminal by efficiently using a very wide frequency bandwidth in a next-generation mobile communication system of the present invention.

In FIG. 2E, it will be described how the next generation mobile communication system efficiently uses a very wide frequency bandwidth to provide services to terminals having different capabilities (capability or category) and to save battery.

One cell provided by the base station can service a very wide frequency band, such as 2e-05. However, in order to service a terminal having different capabilities, one cell can be managed by dividing the wide frequency band into a plurality of partial bandwidths.

First, the terminal that is initially powered on can search the entire frequency band provided by the operator (PLMN) in a certain resource block unit (for example, in 12RB (Resource block) unit). That is, the UE may start searching for a primary synchronization sequence (PSS)/secondary synchronization sequence (SSS) in the entire system bandwidth in units of the resource block (2e-10). If PSS/SSS (2e-01 or 2e-02) is found in the unit of the resource block and the signals are detected, the signals are read and interpreted (decoded) to subframe and radio transmission resource frame. You can check the boundary. Therefore, it is possible to distinguish subframes in units of 1 ms, and synchronization of a downlink signal with a base station is achieved. In the above, a resource block (RB) may be defined in two-dimensional units with a size of a predetermined frequency resource and a predetermined time resource. For example, it may be defined as 1 ms unit as a time resource and 12 subcarriers (1 carrier x 15 kHz = 180 kHz) as a frequency resource. In the above, when the synchronization is completed, the UE checks the master system information block (MIB) or minimal system information (MSI) to check the information of the control resource set (CORESEST) and the initial access bandwidth (BWP) information. It can be confirmed (2e-15, 2e-20). In the above, the CORESET information refers to a location of a time/frequency transmission resource in which a control signal is transmitted from a base station, and indicates, for example, a resource location in which a PDCCH channel is transmitted. That is, the CORESET information is information indicating where the first system information (System information block 1, SIB1) is transmitted, and indicates at what frequency/time resource the PDCCH is transmitted. In the above, when the terminal reads the first system information, information on an initial partial bandwidth (initial BWP) can be confirmed. As described above, when the terminal completes synchronization of a downlink signal with a base station and can receive a control signal, the terminal performs a random access procedure in an initial partial bandwidth (initial BWP) of a cell camped on and establishes an RRC connection. Request and receive an RRC message to establish an RRC connection.

In the RRC connection setup, a plurality of partial bandwidths may be set for each cell (Pcell or Pscell or Spcell or Scell). A plurality of partial bandwidths may be set for the downlink within the single cell, and a plurality of partial bandwidths may be set separately for the uplink.

The plurality of partial bandwidths may be indicated and set as a partial bandwidth identifier (BWP Identifier) to be used as an initial partial bandwidth (initial BWP) or a default partial bandwidth (default BWP) or a first active BWP.

In the above, the initial partial bandwidth (initial BWP) may be used as a partial bandwidth determined by a cell-specific cell-level (cell-specific), and a terminal accessing the cell for the first time connects to the cell through a random access procedure. It may be used as a partial bandwidth for a terminal to establish or establish a connection to perform synchronization. In addition, the base station may set an initial downlink partial bandwidth (initial downlink BWP) to be used in the downlink and an initial uplink partial bandwidth (initial uplink BWP) to be used in the uplink, for each cell. In addition, the configuration information for the initial partial bandwidth may be broadcast in the first system information (system information 1, SIB1) indicated by CORESET, and the base station may re-set the RRC message to the terminal accessing the connection. In addition, the initial partial bandwidth can be used by designating 0 as a partial bandwidth identifier in the uplink and the downlink, respectively. That is, all terminals connected to the same cell can use the same initial partial bandwidth by designating the same partial bandwidth identifier 0. This is because when performing the random access procedure, since the base station can transmit a random access response (RAR) message with an initial partial bandwidth that all terminals can read, there may be an advantage of facilitating contention-based random access procedure. .

In the above, the first active partial bandwidth (first active BWP) may be set differently for each UE (UE specific), and may be indicated by designating a partial bandwidth identifier among a plurality of partial bandwidths. The first active partial bandwidth may be set for downlink and uplink, respectively, and as the first active uplink partial bandwidth (first active downlink BWP) and the first active uplink partial bandwidth (first active uplink BWP), respectively. Can be set. The first activated partial bandwidth may be used to indicate which partial bandwidth is initially activated and used when a plurality of partial bandwidths are set in one cell. For example, when a Pcell or a Pscell and a plurality of Scells are set to a terminal and a plurality of partial bandwidths are set for each of the Pcell or Pscell or Scell, if the Pcell or the Pscell or the Scell is activated, the terminal is connected to the Pcell or Pscell or the Scell The first active BWP may be activated and used among a plurality of set partial bandwidths. That is, the first active downlink partial bandwidth (first active downlink BWP) may be activated for the downlink, and the first activated uplink partial bandwidth (first active uplink BWP) may be activated for the uplink.

In the above, the operation of the UE to activate the first activated downlink partial bandwidth by switching the downlink partial bandwidth for the Scell and to activate the first activated uplink partial bandwidth by switching the uplink partial bandwidth is the Scell or the partial bandwidth is in an inactive state. It can be performed when an RRC message or MAC control information or DCI is received. It may also be performed when an RRC message or MAC control information or DCI is received to instruct to transition the Scell or partial bandwidth to the dormant state. Because, when activating the Scell or partial bandwidth, the channel will be in the dormant state because the downlink partial bandwidth will be switched to activate the first activated downlink partial bandwidth and to switch the uplink partial bandwidth to activate the first activated uplink partial bandwidth. This is because the base station can effectively use the carrier aggregation technology by measuring and reporting the frequency/channel for the first active downlink/uplink partial bandwidth even when performing measurement reporting.

In the above, the default partial bandwidth (default BWP) may be set differently for each UE (UE specific), and may be indicated by designating a partial bandwidth identifier among a plurality of partial bandwidths. The basic partial bandwidth may be set only for the downlink. The basic partial bandwidth may be used as a partial bandwidth in which an activated partial bandwidth among a plurality of downlink partial bandwidths will fall back after a predetermined time. For example, a partial bandwidth deactivation timer (bwp inactivity timer) can be set for each cell or for each partial bandwidth as an RRC message, and the timer starts or restarts when data transmission/reception occurs in the activated partial bandwidth rather than the basic partial bandwidth. Can be started or restarted when the activated partial bandwidth is switched to another partial bandwidth. When the timer expires, the UE may fall back or switch the downlink partial bandwidth activated in the cell to the default bandwidth. In the above, switching may denote a procedure for deactivating a currently active partial bandwidth and activating a partial bandwidth for which switching is indicated, and the switching is an RRC message or MAC control element (MAC control element) or L1 signaling (DCI (PDCCH DCI). Downlink Control Information), wherein the switching can be triggered by indicating the partial bandwidth to be switched or activated, and the partial bandwidth is a partial bandwidth identifier (eg, 0 or 1 or 2 or 3 or 4). ).

The reason for using the basic partial bandwidth only for the downlink is that the base station schedules the base station by receiving the instruction of the base station (for example, DCI of PDCCH) by causing the base station to fall back to the basic partial bandwidth after a certain time for each cell. This is because it can be easily done. For example, if the base station sets the basic partial bandwidth of terminals connected to one cell as the initial partial bandwidth, the base station may continuously perform scheduling instructions only in the initial partial bandwidth after a certain time. If the basic partial bandwidth is not set in the RRC message, the initial partial bandwidth may be regarded as the basic partial bandwidth and fall back to the initial partial bandwidth when the partial band deactivation timer expires.

In another way, in order to increase the degree of freedom of implementation of the base station, it is possible to define and set a basic partial bandwidth for the uplink and use it as the basic partial bandwidth of the downlink.

FIG. 2F shows a procedure for a UE to switch from RRC idle mode to RRC connected mode in a next-generation mobile communication system of the present invention, and sets a plurality of bandwidth parts (BWP) This is a diagram that proposes a method for setting a default bandwidth (default BWP) or a first active BWP.

One cell provided by the base station can service a very wide frequency band. First, the terminal may search for the entire frequency band provided by the operator (PLMN) in a certain resource block unit (for example, in 12RB (Resource block) unit). That is, the UE may start searching for a primary synchronization sequence (PSS)/secondary synchronization sequence (SSS) in the entire system bandwidth in units of the resource block. If the PSS/SSS is found in the unit of the resource block and the signals are detected, the boundary between the subframe and the radio frame can be checked by reading and interpreting (decoding) the signals. In the above, when the synchronization is completed, the system can read system information of the cell that is currently camping on. That is, by checking the Master System Information Block (MIB) or Minimum System Information (MSI), you can check the information of the Control Resource Set (CORESEST) and read the system information to check the Initial Bandwidth Part (BWP) information. (2f-01, 2f-05). In the above, the CORESET information refers to a location of a time/frequency transmission resource in which a control signal is transmitted from a base station, and indicates, for example, a resource location in which a PDCCH channel is transmitted.

As described above, when the terminal completes synchronization of a downlink signal with a base station and can receive a control signal, the terminal performs a random access procedure in an initial partial bandwidth, receives a random access response, requests RRC connection establishment, and , RRC connection establishment may be performed by receiving an RRC message (2f-10, 2f-15, 2f-20, 2f-25, 2f-30).

When the basic RRC connection is established in the above, the base station can send an RRC message to the terminal to inquire about the capability of the terminal in order to check the UE capability (UECapabilityEnquiry, 2f-35). In another way, the base station may ask the MME or AMF for the terminal's capabilities to confirm the terminal's capabilities. This is because the MME or AMF may have stored the capability information of the terminal if the terminal had been previously connected. If there is no terminal capability information desired by the base station, the base station may request the terminal for terminal capability.

The reason why the base station sends an RRC message to the UE to check the UE's performance is to check the UE's performance and, for example, how much frequency band the UE can read or read. Can grasp. In addition, after confirming the performance of the terminal, an appropriate partial bandwidth (BWP) may be set for the terminal. When the UE receives the RRC message asking about the UE's performance from the above, in response to this, the UE instructs the range of the bandwidth supported by the UE or the bandwidth from the current system bandwidth to an offset from the reference center frequency or Alternatively, the start and end points of the supported frequency bandwidth can be directly indicated, or the center frequency and bandwidth can be indicated (2f-40).

In the above, the partial bandwidth may be set as an RRCSetup message or an RRCResume message (2f-25) or an RRCReconfiguration message (2f-45) of an RRC connection setup, and the RRC message provides configuration information for PCell or Pscell or a plurality of Scells. It may include, and may set a plurality of partial bandwidths for each cell (PCell or Pscell or Scell). When setting a plurality of partial bandwidths for each cell, a plurality of partial bandwidths to be used in the downlink of each cell may be set. In the case of an FDD system, the uplink of each cell is distinguished from the downlink partial bandwidths. Multiple partial bandwidths to be used can be set. In the case of a TDD system, a plurality of partial bandwidths to be commonly used in downlink and uplink of each cell can be set.

Information for partial bandwidth setting of each cell (PCell or Pscell or Scell) may include the following information.

-Downlink partial bandwidth setting information of the cell

■ Initial downlink partial bandwidth (initial downlink BWP) setting information

■ Multiple partial bandwidth setting information and partial bandwidth identifier (BWP ID) corresponding to each partial bandwidth

■ Initial state setting information of each partial bandwidth for a plurality of partial bandwidths (for example, active state or dormant state or inactive state)

■ Partial bandwidth identifier indicating the first active downlink partial bandwidth (first active downlink BWP)

■ Partial bandwidth identifier indicating the default partial bandwidth (default BWP)

■ Partial bandwidth deactivation timer setting and timer value

-Uplink partial bandwidth setting information of the cell

■ Initial uplink partial bandwidth (initial uplink BWP) setting information

■ Multiple partial bandwidth setting information and partial bandwidth identifier (BWP ID) corresponding to each partial bandwidth

■ Initial state setting information of each partial bandwidth for a plurality of partial bandwidths (for example, active state or dormant state or inactive state)

■ Partial bandwidth identifier indicating the first active uplink partial bandwidth (first active uplink BWP)

The initial partial bandwidth (initial BWP) or the default partial bandwidth (default BWP) or the first active BWP (first active BWP) set in the above may be used for the following purposes, and may be operated as follows according to the purpose. .

In the above, the initial partial bandwidth (initial BWP) may be used as a partial bandwidth determined by a cell-specific cell-level (cell-specific), and a terminal accessing the cell for the first time connects to the cell through a random access procedure. It may be used as a partial bandwidth for a terminal to establish or establish a connection to perform synchronization. In addition, the base station may set an initial downlink partial bandwidth (initial downlink BWP) to be used in the downlink and an initial uplink partial bandwidth (initial uplink BWP) to be used in the uplink, for each cell. In addition, the configuration information for the initial partial bandwidth may be broadcast in the first system information (system information 1, SIB1) indicated by CORESET, and the base station may re-set the RRC message to the terminal accessing the connection. In addition, the initial partial bandwidth can be used by designating 0 as a partial bandwidth identifier in the uplink and the downlink, respectively. That is, all terminals connected to the same cell can use the same initial partial bandwidth by designating the same partial bandwidth identifier 0. This is because when performing the random access procedure, since the base station can transmit a random access response (RAR) message with an initial partial bandwidth that all terminals can read, there may be an advantage of facilitating contention-based random access procedure. .

In the above, the first active partial bandwidth (first active BWP) may be set differently for each UE (UE specific), and may be indicated by designating a partial bandwidth identifier among a plurality of partial bandwidths. The first active partial bandwidth may be set for downlink and uplink, respectively, and as the first active uplink partial bandwidth (first active downlink BWP) and the first active uplink partial bandwidth (first active uplink BWP), respectively. Can be set. The first activated partial bandwidth may be used to indicate which partial bandwidth is initially activated and used when a plurality of partial bandwidths are set in one cell. For example, when a Pcell or a Pscell and a plurality of Scells are set to a terminal and a plurality of partial bandwidths are set for each of the Pcell or Pscell or Scell, if the Pcell or the Pscell or the Scell is activated, the terminal is connected to the Pcell or Pscell or the Scell The first active BWP may be activated and used among a plurality of set partial bandwidths. That is, the first active downlink partial bandwidth (first active downlink BWP) may be activated for the downlink, and the first activated uplink partial bandwidth (first active uplink BWP) may be activated for the uplink.

In the above, the operation of the UE to activate the first activated downlink partial bandwidth by switching the downlink partial bandwidth for the Scell and to activate the first activated uplink partial bandwidth by switching the uplink partial bandwidth is the Scell or the partial bandwidth is in an inactive state. It can be performed when an RRC message or MAC control information or DCI is received. It may also be performed when an RRC message or MAC control information or DCI is received to instruct to transition the Scell or partial bandwidth to the dormant state. Because, when activating the Scell or partial bandwidth, the channel will be in the dormant state because the downlink partial bandwidth will be switched to activate the first activated downlink partial bandwidth and to switch the uplink partial bandwidth to activate the first activated uplink partial bandwidth. This is because the base station can effectively use the carrier aggregation technology by measuring and reporting the frequency/channel for the first active downlink/uplink partial bandwidth even when performing measurement reporting.

In the above, the default partial bandwidth (default BWP) may be set differently for each UE (UE specific), and may be indicated by designating a partial bandwidth identifier among a plurality of partial bandwidths. The basic partial bandwidth may be set only for the downlink. The basic partial bandwidth may be used as a partial bandwidth in which an activated partial bandwidth among a plurality of downlink partial bandwidths will fall back after a predetermined time. For example, a partial bandwidth deactivation timer (bwp inactivity timer) can be set for each cell or for each partial bandwidth as an RRC message, and the timer starts or restarts when data transmission/reception occurs in the activated partial bandwidth rather than the basic partial bandwidth. Can be started or restarted when the activated partial bandwidth is switched to another partial bandwidth. When the timer expires, the UE may fall back or switch the downlink partial bandwidth activated in the cell to the default bandwidth. In the above, switching may denote a procedure for deactivating a currently active partial bandwidth and activating a partial bandwidth for which switching is indicated, and the switching is an RRC message or MAC control element (MAC control element) or L1 signaling (DCI (PDCCH DCI). Downlink Control Information), wherein the switching can be triggered by indicating the partial bandwidth to be switched or activated, and the partial bandwidth is a partial bandwidth identifier (eg, 0 or 1 or 2 or 3 or 4). ).

The reason for using the basic partial bandwidth only for the downlink is that the base station schedules the base station by receiving the instruction of the base station (for example, DCI of PDCCH) by causing the base station to fall back to the basic partial bandwidth after a certain time for each cell. This is because it can be easily done. For example, if the base station sets the basic partial bandwidth of terminals connected to one cell as the initial partial bandwidth, the base station may continuously perform scheduling instructions only in the initial partial bandwidth after a certain time. If the basic partial bandwidth is not set in the RRC message, the initial partial bandwidth may be regarded as the basic partial bandwidth and fall back to the initial partial bandwidth when the partial band deactivation timer expires.

In another way, in order to increase the degree of freedom of implementation of the base station, it is possible to define and set a basic partial bandwidth for the uplink and use it as the basic partial bandwidth of the downlink.

In addition, in the RRCSetup message or RRCResume message (2f-25) or RRCReconfiguration message (2f-45) of the RRC connection setup, the terminal does not receive an RRC message or MAC control information from the base station or an indication due to DCI of the PDCCH. A state transition timer can be set to perform a state transition. For example, by setting a cell deactivation timer (ScellDeactivationTimer) or a partial bandwidth deactivation timer (BwpDeactivationTimer) for each Scell or partial bandwidth, when the cell deactivation timer or partial bandwidth deactivation timer expires, the Scell or partial bandwidth can be transitioned to an inactive state. have. In addition, for each Scell or partial bandwidth, a cell sleep timer (ScellHibernationTimer) or a partial bandwidth sleep timer (BwpHibernationTimer) is set to sleep the Scell or partial bandwidth when the cell sleep timer or partial bandwidth sleep timer expires. State. When the cell dormancy timer or partial bandwidth dormancy timer expires, only the activated Scell or partial bandwidth transitions to the dormant state, and the inactive or dormant Scell or partial bandwidth does not transition to the dormant state. It can be characterized by doing. In addition, for each Scell or partial bandwidth, the dormant state cell deactivation timer (dormantScellDeactivationTimer) or the dormant state partial bandwidth deactivation timer (dormantBwpDeactivationTimer) can be set to transition the dormant Scell or partial bandwidth to the deactivated state. When the dormant state cell deactivation timer or the dormant state partial bandwidth deactivation timer expires, only the Scell or the partial bandwidth that is in the dormant state is transitioned to the inactive state, and the Scell or the partial bandwidth that is in the activated state or the inactive state is not transitioned to the inactive state. It can be characterized by. If the cell deactivation timer (ScellDeactivationTimer) (or partial bandwidth deactivation timer) and cell sleep timer (ScellHibernationTimer) (or partial bandwidth sleep timer) are set together in the above, the cell sleep timer (ScellHibernationTimer) (or partial bandwidth sleep) It may be characterized by giving priority to the talk timer). That is, if the cell sleep timer (ScellHibernationTimer) (or partial bandwidth sleep timer) is set, the cell deactivation timer (ScellDeactivationTimer) (or partial bandwidth deactivation timer) does not deactivate the corresponding Scell or partial bandwidth. In other words, when the cell sleep timer (or partial bandwidth sleep timer) is set, the Scell or partial bandwidth is first transitioned from the active state to the sleep state with the expiration of the cell sleep timer, and the expiration of the sleep state cell deactivation timer It is characterized in that the cells transitioned to the dormant state are gradually transitioned to the inactive state. Therefore, if the cell dormancy timer is set, the cell inactivation timer does not affect the Scell or partial bandwidth state transition, and if the cell dormancy timer expires, the cell or partial bandwidth does not transition to the inactive state. Does.

When the cell deactivation timer (or partial bandwidth deactivation timer) is not set in the RRC message, the UE may consider that the cell deactivation timer (or partial bandwidth deactivation timer) is set to an infinity value.

In addition, in the RRC Setup message, RRCResume message (2f-25) or RRCReconfiguration message (2f-45) of the RRC connection setting, frequency measurement configuration information and frequency measurement gap information can be set. And may include information on a frequency measurement object. The frequency measurement report object may include partial bandwidth information in which a reference signal (RS)/synchronization signal (SS) is set, and a center frequency, a bandwidth corresponding to the partial bandwidth, and applied when measuring It may include a time pattern (time pattern) that should be. The measurement report gap information may include measurement gap length, measurement gap period, and measurement gap start time information corresponding to how long to measure. In the above, RS is a signal of a base station that is transmitted with a time/frequency pattern partially in a transmission resource of a subframe in which a control signal or a data signal is transmitted, and is used to determine the strength of a signal of a corresponding partial bandwidth or a corresponding cell. Can. The SS signal is a synchronization signal that is periodically transmitted, such as PSS or SSS, which can also be used to determine the corresponding partial bandwidth or the signal strength of the corresponding cell.

When the RRC connection is established as described above, the UE may set a plurality of partial bandwidths according to the instructions set by the RRC message. In addition, one or a small number of bandwidths may be activated among the plurality of partial bandwidths set in order to save the battery. For example, one partial bandwidth to be activated may be indicated. In addition, the base station instructs the activation of the partial bandwidth as an RRC message or as MAC control information (MAC CE) or L1 signaling (a PHY layer control signal such as PDCCH) (eg, bitmap information may indicate whether to deactivate activation). By doing so, it is possible to instruct to switch from the initial access partial bandwidth to the new partial bandwidth. Since there may be many new users accessing the initial access partial bandwidth, it may be more advantageous to allocate a new partial bandwidth and manage separately connected users in terms of scheduling. This is because the initial access part bandwidth is not set for each terminal, but can be shared and used for all terminals. It is also possible to dynamically indicate the default partial bandwidth with the MAC control information or L1 signaling or system information (to reduce signaling overhead).

Next, the present invention proposes a new hibernation state in the next generation mobile communication system, and proposes a method for supporting three state transitions in a partial bandwidth unit.

2G is a diagram showing a state transition procedure of a cell or a partial bandwidth proposed in the present invention.

As shown in FIG. 2G, each cell or partial bandwidth of the UE may have an active state (2g-01) or an inactive state (2g-03) or a dormant state (2g-02), and configuration information or MAC control information of an RRC message or The state transition can be performed due to the indication by the DCI of the PDCCH.

The state transition operation (activation or deactivation or dormancy) of the Scell or partial bandwidth proposed in the present invention may be performed in the following cases.

-When the Scell state or partial bandwidth is set by RRC message,

-Scell activation and deactivation When MAC CE is received,

-When partial bandwidth activation and deactivation and dormant MAC CE are received,

-When Scell dormant MAC CE is received,

-If the cell dormancy timer is not set in the activation state Scell, and the set cell inactivity timer has expired,

-If the partial bandwidth dormancy timer is not set in the active state partial bandwidth, and the set partial bandwidth deactivation timer expires,

-When the cell sleep timer set in the activation state Scell has expired,

-When the partial bandwidth sleep timer set in the active state partial bandwidth expires,

-If the sleep state Scell deactivation timer set in the sleep state Scell has expired,

-When the dormant partial bandwidth deactivation timer set in the dormant partial bandwidth expires,

In addition, the state transition operation proposed in the present invention may have the following features.

-Spcell (Pcell or Pscell) (or partial bandwidth of the cell) cannot be transitioned to the dormant state, and is characterized by always activating. Spcells are synchronized and the main control signals are transmitted and received, so if the Spcell is dormant or deactivated, the connection with the base station is disconnected, so it must always remain activated.

-It is characterized by being unable to transition to the dormant state if PUCCH is set although it is Scell. It should be activated because there may be other cells that need to send feedback such as HARQ ACK/NACK to PUCCH.

-Due to the above characteristics, the cell deactivation timer (ScellDeactivationTimer) can also be driven only for other Scells if it is not applied to the spcell and PUCCH-configured Scell.

-The cell sleep timer (ScellHibernationTimer) takes priority over the cell deactivation timer (ScellDeactivationTimer). In addition, when one value is set as the RRC message, the same value may be applied to all cells. As another method, the base station may set different timer values for each Scell or for each BWP by considering characteristics of each cell or each BWP.

-If the Scell is not indicated to be activated or dormant in the RRC message, it may be characterized in that it initially operates in an inactive state.

As a first embodiment of the present invention, in the next-generation mobile communication system using partial bandwidth, when applying the activated state or the deactivated state or the dormant state proposed by the present invention, operation of each cell (Scell) and partial bandwidth according to each state I suggest as follows.

The first embodiment of the present invention is characterized in that it operates in an activated state or an inactive state or a dormant state, and performs a state transition in a partial bandwidth unit. When a state transition occurs in a partial bandwidth unit, the state transition is indicated. The partial bandwidth is characterized by performing state transition according to the instruction according to the state transition. For example, if the partial bandwidth transitions from the active state to the dormant state, the partial bandwidth may be transitioned to the dormant state.

2H is a diagram illustrating a partial bandwidth state transition method through Scell unit state transition proposed in the present invention.

In the first embodiment of the present invention, it is characterized in that it is performed in a partial bandwidth unit when operating an activated state or an inactive state or a dormant state in a partial bandwidth unit and performing state transition as shown in FIG. 2H, and in a partial bandwidth unit. When a transition occurs, it is characterized in that a state transition is performed by indicating one partial bandwidth among a plurality of partial bandwidths belonging to the Scell.

As shown in Figure 2h, the Pcell (2h-10) can be kept always active so that the wireless connection between the base station and the terminal is not broken. In the case of an FDD system in each cell (Pcell or Scells), frequencies for downlink and uplink may be divided, and a plurality of partial bandwidths may be set for downlink and uplink, respectively. In the case of a TDD system, frequencies for downlink and uplink may not be distinguished, and a plurality of partial bandwidths may be set without distinguishing downlink and uplink.

The present invention is characterized in that a plurality of bandwidths for each downlink or uplink for each Scell may have a plurality of active states or a dormant state, and the remaining partial band poles are in an inactive state. That is, the base station receives a channel measurement report for a plurality of partial bandwidths by increasing the data transmission amount by increasing the transmission resources capable of transmitting data using a plurality of activated partial bandwidths, and using a plurality of dormant partial bandwidths. This can efficiently schedule and save terminal power.

For example, as shown in FIG. 2H, the base station may set the first Scell (2h-20), the second Scell (2h-30), and the third Scell (2h-40) to the UE.

If the base station transitions some partial bandwidth of the first Scell (2h-20) to the dormant state with an RRC message or MAC CE, the terminal among the plurality of partial bandwidths set in the first Scell is the partial bandwidth indicated above. Can transition to a dormant state.

If the base station transitions some partial bandwidth of the second Scell (2h-30) to the deactivated state with an RRC message or MAC CE, the UE selects the partial bandwidth indicated above among the plurality of partial bandwidths set in the second Scell. You can transition to an inactive state.

If the base station transitions some partial bandwidth of the third Scell (2h-40) to an active state with an RRC message or MAC CE, the terminal among the plurality of partial bandwidths set in the first Scell is the partial bandwidth indicated above. Can transition to an active state.

In the following, the present invention proposes a state transition operation for the partial bandwidth when the base station instructs the terminal of the state transition in units of partial bandwidth as described above.

-(Partial Bandwidth Activation) When the MAC layer device receives a MAC CE to activate for a certain bandwidth or an RRC message to activate, it may perform some or all of the following plurality of operations.

■ Activate the partial bandwidth.

■ SRS (Sounding Reference Signal) is transmitted to enable the base station to perform channel measurement for uplink in the activated partial bandwidth. For example, it can be transmitted periodically.

■ In the activated partial bandwidth, the UE may report a channel measurement result (CSI or CQI or PMI or RI or PTI or CRI) according to a base station setting for a downlink.

■ Monitor the PDCCH to read the instructions of the base station in the activated partial bandwidth.

■ Monitor the PDCCH to read the cross-scheduling for the active partial bandwidth.

■ If PUCCH is set in the activated partial bandwidth, PUCCH transmission is performed.

■ Start or restart the partial bandwidth deactivation timer for the partial bandwidth. Alternatively, the partial bandwidth deactivation timer can be started or restarted only when the partial bandwidth sleep timer is not set.

■ If there is a type 1 configuration transmission resource that has been discontinued, the stored type 1 transmission resource configuration can be initialized or re-initialized and used. In the above, the type 1 configuration transmission resource is a periodic transmission resource (uplink or downlink) allocated in advance as an RRC message and means a transmission resource that can be activated and used as an RRC message.

■ If a partial bandwidth sleep timer is set in the partial bandwidth,

◆ Start or restart the partial bandwidth sleep timer for the partial bandwidth.

■ PHR is triggered for the partial bandwidth.

-(Partial Bandwidth Disabled) When MAC layer device receives MAC CE to disable for some partial bandwidth or RRC message to disable

-Or, if the partial bandwidth deactivation timer for the active partial bandwidth has expired, and the partial bandwidth dormancy timer is not set (if the partial bandwidth dormancy timer is set, the partial bandwidth dormancy timer must be prioritized). Ignore the case where the partial bandwidth deactivation timer has expired, that is, when the partial bandwidth dormancy timer is set, the partial bandwidth state transition must first transition from the active state to the dormant state, and then from the dormant state to the inactive state. do.)

■ The terminal may perform some or all of the following plurality of operations.

■ Deactivate the partial bandwidth of the Scell.

■ The partial bandwidth deactivation timer set in the partial bandwidth is stopped.

■ Stop the partial bandwidth deactivation timer set for the partial bandwidth.

■ The periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) set in the partial bandwidth may be cleared. In the above, clearing means that the terminal stores the setting information such as the cycle information set in the RRC message, but removes information on the periodic transmission resource indicated or activated by L1 signaling (for example, DCI). This means that it is no longer used. The periodic transmission resource may be referred to as a type 2 configuration transmission resource.

■ If there is a PUSCH transmission resource configured for periodic channel measurement information (semi-persistent CSI reporting) for the partial bandwidth, it is cleared.

■ The periodic uplink transmission resource (configured uplink grant Type 1 set to RRC) set in the partial bandwidth may be suspended. In the above, the meaning of suspend means that the terminal stores the transmission resource configuration information set in the RRC message, but does not use it anymore. The periodic transmission resource may be referred to as a type 1 configuration transmission resource.

■ Empty all HARQ buffers set for the partial bandwidth.

-If the PDCCH in some active partial bandwidth indicates that there is downlink data (downlink assignment) or allocates uplink transmission resources (Uplink grant)

-Or, in a serving cell scheduling for some activated partial bandwidth, if the PDCCH indicates that there is downlink data for the activated partial bandwidth (downlink assignment) or allocates uplink transmission resources (Uplink grant)

-Or, for the activated partial bandwidth, if any MAC PDU is transmitted in a preset downlink transmission resource (configured downlink assignment) or a preset uplink transmission resource (configured uplink grant)

■ The terminal restarts the partial bandwidth deactivation timer that is running for the partial bandwidth. Alternatively, the partial bandwidth deactivation timer can be restarted only when partial bandwidth sleep is not set.

■ If a partial bandwidth sleep timer is set for the partial bandwidth,

◆ Restart the partial bandwidth sleep timer.

-If the partial bandwidth of the Scell is inactive or inactive

■ The terminal does not transmit the SRS for the partial bandwidth of the Scell.

■ In the partial bandwidth of the Scell, the UE does not perform channel measurement (CSI or CQI or PMI or RI or PTI or CRI) on the downlink (Do0wnlink) and does not report.

■ Uplink data is not transmitted through UL-SCH in the partial bandwidth of the Scell.

■ The random access procedure is not performed for the partial bandwidth of the Scell.

■ In the partial bandwidth of the Scell, the UE does not monitor the PDCCH.

■ The UE does not monitor the PDCCH for the partial bandwidth of the Scell. For example, in the case of cross-scheduling, the PDCCH for the Scell is not monitored in the cell to be scheduled.

■ PUCCH or SPUCCH transmission is not performed in the partial bandwidth.

-If there is a random access procedure in progress in the partial bandwidth when the partial bandwidth is deactivated, cancel it.

-The dormant state does not apply to Spcell or Scell with PUCCH set.

The MAC layer device can operate two timers to efficiently operate the sleep state of the Scell.

-Partial bandwidth dormant timer (BWPHibernationTimer): The partial bandwidth dormant timer is driven at the partial bandwidth set for the UE, but not at the cell where the PUCCH is set. When the partial bandwidth sleep timer expires, the MAC layer device transitions the partial bandwidth in the active state to the sleep state. That is, the cell sleep timer can be applied only to the activated Scell. One value set as RRC applies equally to the cell sleep timer of each Scell. In addition, the cell sleep timer takes priority over the cell deactivation timer. That is, the cell sleep timer is set, and if it is running, the cell deactivation timer does not transition to the deactivated state even if the cell deactivation timer is driven or expired, and the cell deactivation timer does not affect the Scell.

-Dormant state partial bandwidth deactivation timer (dormantBWPDeactivationTimer): the dormant state cell deactivation timer runs on the Scell set for the UE, but not on the Scell with the PUCCH set. When the dormant partial bandwidth deactivation timer expires, the MAC layer device transitions the dormant partial bandwidth to an inactive state. One value set as RRC is equally applied to the dormant cell deactivation timer of each partial bandwidth. That is, the dormant partial bandwidth deactivation timer is only applied to the dormant partial bandwidth.

When the partial bandwidth is set, if the RRC message indicates the sleep state, the UE may transition the partial bandwidth to the sleep state. In the case of handover or SCG change, if the sleep state is indicated in the partial bandwidth state setting of the RRC message, the partial bandwidth may be shifted to the sleep state.

-If the MAC layer device is instructed to dormant when receiving the partial bandwidth setting by the RRC message, or if it receives the MAC CE indicating to transition the partial bandwidth to the dormant state

■ The terminal may perform some or all of the following plurality of operations.

■ Transition the partial bandwidth of the Scell to the dormant state.

■ Stop the cell deactivation timer set or running in the partial bandwidth of the Scell.

■ If the partial bandwidth sleep timer is set to the partial bandwidth of the Scell, the partial bandwidth sleep timer is stopped.

■ Start or restart the dormant partial bandwidth deactivation timer in the partial bandwidth of the Scell.

■ Stop the partial bandwidth deactivation timer set for the partial bandwidth of the Scell. This is to prevent unnecessary partial bandwidth switching procedure in the Scell.

■ The periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) set in the partial bandwidth of the Scell may be cleared. In the above, clearing means that the terminal stores the setting information such as the cycle information set in the RRC message, but removes information on the periodic transmission resource indicated or activated by L1 signaling (for example, DCI). This means that it is no longer used. The proposed method, that is, the operation of clearing the set periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant) is performed when the partial bandwidth is It can also be performed only when transitioning from the activated state to the dormant state. This is because when the partial bandwidth transitions from the inactive state to the dormant state, there is no information on the periodic transmission resource information indicated or activated by L1 signaling.

■ The periodic uplink transmission resource (configured uplink grant Type 1 configured as RRC) set in the partial bandwidth of the Scell may be suspended. In the above, the meaning of suspend means that the terminal stores the transmission resource configuration information set in the RRC message, but does not use it anymore. The proposed method, that is, the operation of suspending the configured periodic uplink grant resource (configured uplink grant Type 1) may be performed only when the partial bandwidth transitions from the activated state to the dormant state. This is because the periodic transmission resource is not used when the partial bandwidth transitions from the inactive state to the dormant state.

■ Empty all HARQ buffers set in the partial bandwidth.

-If the partial bandwidth dormancy timer expires in the active Scell partial bandwidth,

■ The terminal transitions the partial bandwidth of the Scell to the dormant state.

■ The terminal stops the partial bandwidth deactivation timer set or running in the partial bandwidth of the Scell.

■ The terminal stops the partial bandwidth dormancy timer set or running in the partial bandwidth of the Scell.

■ The terminal starts or restarts the dormant state partial bandwidth deactivation timer in the partial bandwidth of the Scell.

-If the dormant partial bandwidth deactivation timer set in the dormant partial bandwidth expires

■ Transition the partial bandwidth of the Scell to an inactive state.

■ The dormant state of the partial bandwidth of the Scell stops the partial bandwidth deactivation timer.

-If the partial bandwidth of the Scell) is in the dormant state

■ The terminal does not transmit SRS for the partial bandwidth of the Scell.

■ In the partial bandwidth of the Scell, the UE performs channel measurement (CSI or CQI or PMI or RI or PTI or CRI) according to the setting of the base station for downlink and performs a measurement report. For example, it is possible to periodically perform channel or frequency measurement reporting.

■ Uplink data is not transmitted through UL-SCH in the partial bandwidth of the Scell.

■ The random access procedure is not performed for the partial bandwidth of the Scell.

■ In the partial bandwidth of the Scell, the UE does not monitor the PDCCH.

■ The UE does not monitor the PDCCH for the partial bandwidth of the Scell. For example, in the case of cross-scheduling, the PDCCH for the Scell is not monitored in the cell to be scheduled.

■ PUCCH or SPUCCH transmission is not performed in a partial bandwidth of the Scell.

■ In the above, the downlink partial bandwidth is dormant and channel measurement is performed and reported, and the uplink partial bandwidth of the Scell may be deactivated and not used. This is because the Scell in the dormant state performs channel measurement only for the downlink partial bandwidth, and the measurement result is reported as the uplink partial bandwidth of the Scell with Spcell (Pcell or Pscell) or PUCCH.

■ Since the transition is indicated in the dormant state with respect to the partial bandwidth of the Scell, the first activated downlink partial bandwidth indicating the downlink partial bandwidth (DL BWP) or uplink partial bandwidth (UL BWP) of the Scell in the RRC message, respectively. (indicated by firstActiveDownlinkBWP-Id) or first activated uplink partial bandwidth (indicated by firstActiveUplinkBWP-id). Because the first active uplink/downlink partial bandwidth set by RRC will be activated when the partial bandwidth that was in the inactive state or the dormant state transitions to the active state, the channel measurement report is first activated in the dormant state. This is because it is efficient to perform in the link partial bandwidth. As another method, when transitioning to the dormant state, only the downlink partial bandwidth may be switched to the first active downlink partial bandwidth and dormant. This is because when activating the partial bandwidth, the uplink partial bandwidth will also be switched and activated to the first activated uplink partial bandwidth. If the partial bandwidth that was active in the partial bandwidth before the sleep state was indicated in the above was originally the first active downlink or uplink partial bandwidth, it may be dormant without performing a switching operation.

■ The periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant Type 2) set in the partial bandwidth of the Scell may be cleared. In the above, clearing means that the terminal stores the setting information such as the cycle information set in the RRC message, but removes information on the periodic transmission resource indicated or activated by L1 signaling (for example, DCI). This means that it is no longer used. The proposed method, that is, the operation of clearing the set periodic downlink transmission resource (DL SPS or configured downlink assignment) or the set periodic uplink transmission resource (UL SPS or configured uplink grant) is performed when the partial bandwidth is It can also be performed only when transitioning from the activated state to the dormant state. This is because when the partial bandwidth transitions from the inactive state to the dormant state, there is no information on the periodic transmission resource information indicated or activated by L1 signaling.

■ The periodic uplink transmission resource (configured uplink grant Type 1 configured as RRC) set in the partial bandwidth of the Scell may be suspended. In the above, the meaning of suspend means that the terminal stores the transmission resource configuration information set in the RRC message, but does not use it anymore. The proposed method, that is, the operation of suspending the configured periodic uplink grant resource (configured uplink grant Type 1) may be performed only when the partial bandwidth transitions from the activated state to the dormant state. This is because the periodic transmission resource is not used when the partial bandwidth transitions from the inactive state to the dormant state.

-If there is a random access procedure in progress when the partial bandwidth transitions to the dormant state, cancel it.

In the following, the present invention proposes a state transition MAC control element (MAC control element) indicating an active state, a dormant state, or an inactive state for each partial bandwidth.

2i is a diagram showing MAC control information indicating a state transition to an activated state, a dormant state, or an inactive state proposed in the present invention.

The activation and deactivation MAC CE proposed in the present invention may have the structure shown in FIG. 2i as an embodiment, and the MAC CE structure supporting 2 Scells (2i-05) or the MAC CE supporting 31 Scells It can be divided into structure (2i-10) or one Scell. And it has the following features.

-In a MAC CE structure such as 2i-05 or 2i-10, a group of bits indicating each cell can be defined, the group can be defined as a Ci field, and the i indicator of the Ci field indicates a cell identifier can do. And, in the Ci field corresponding to each Scell, an identifier indicating an uplink or a downlink may be included, a partial bandwidth identifier may be included, and an indicator indicating the state of the partial bandwidth (active state or dormant state) Or inactive state). Accordingly, a specific cell may be indicated in the MAC CE structure as described above, a downlink or uplink of the indicated cell may be indicated, and a partial bandwidth of the indicated downlink or uplink of the indicated cell may be indicated. In addition, the state transition of the indicated downlink or uplink partial bandwidth of the indicated cell may be indicated.

-In a MAC CE structure such as 2i-15, a cell identifier corresponding to one cell and an identifier indicating an uplink or downlink may be included, a partial bandwidth identifier may be included, and a state of the partial bandwidth may be indicated. Indicator (active state or dormant state or inactive state). Accordingly, a specific cell may be indicated in the MAC CE structure as described above, a downlink or uplink of the indicated cell may be indicated, and a partial bandwidth of the indicated downlink or uplink of the indicated cell may be indicated. In addition, the state transition of the indicated downlink or uplink partial bandwidth of the indicated cell may be indicated.

Various MAC CE structures based on the proposed feature can be extended to an embodiment, and the feature proposed in the present invention can indicate a state transition of a downlink or uplink partial bandwidth of each cell using the MAC CE. , It is characterized in that the downlink or uplink partial bandwidth of each cell can be switched using the MAC CE.

2J is a diagram illustrating a terminal operation for performing state transition on a cell set in a terminal in the present invention.

In FIG. 2J, the base station may configure a plurality of Scells together with a Spcell (Pcell or Pscell) to the UE.

If the set cell is a Spcell (2j-05), the Spcell can always remain activated with the indication of the base station (2j-10), and if the set cell is an Scell (2j-05), the indication or cell of the base station Depending on the expiration of the timer set at, a partial bandwidth state transition may be performed. For example, if a base station indicates a state transition for a partial bandwidth of a certain cell with an RRC message or a MAC CE, or if a timer set by the base station expires for a partial bandwidth of a certain cell, a partial bandwidth state transition operation of a certain cell is triggered. The UE performs a state transition to an activated state, a dormant state, or an inactive state with respect to the partial bandwidth of the Scell, and can perform operations suitable for the states of each partial bandwidth proposed in the present invention (2j-25, 2j). -30, 2j-35)

2K shows a structure of a terminal to which an embodiment of the present invention can be applied.

Referring to the drawings, the terminal includes a radio frequency (RF) processor 2k-10, a baseband, a processor 2k-20, a storage 2k-30, and a controller 2k-40 do.

The RF processor 2k-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 2k-10 converts the baseband signal provided from the baseband processor 2k-20 to an RF band signal, transmits it through an antenna, and transmits the RF band signal through the antenna. Downconvert to baseband signal. For example, the RF processing unit 2k-10 may include a transmission filter, a reception filter, an amplifier, a mixer, an oscillator, a digital to analog convertor (DAC), and an analog to digital converter (ADC). Can be. In the figure, only one antenna is shown, but the terminal may have multiple antennas. In addition, the RF processing unit 2k-10 may include a plurality of RF chains. Furthermore, the RF processing unit 2k-10 may perform beamforming. For the beamforming, the RF processor 2k-10 may adjust the phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements. In addition, the RF processor may perform MIMO, and may receive multiple layers when performing MIMO operations. The RF processing unit 2k-10 may perform reception beam sweeping by appropriately setting a plurality of antennas or antenna elements under control of the control unit, or adjust the direction and beam width of the reception beam so that the reception beam is coordinated with the transmission beam have.

The baseband processor 2k-20 performs a conversion function between a baseband signal and a bit stream according to a physical layer standard of the system. For example, when transmitting data, the baseband processor 2k-20 generates complex symbols by encoding and modulating a transmission bit stream. In addition, when receiving data, the baseband processor 2k-20 restores the received bit stream through demodulation and decoding of the baseband signal provided from the RF processor 2k-10. For example, in the case of conforming to the orthogonal frequency division multiplexing (OFDM) method, when transmitting data, the baseband processor 2k-20 generates complex symbols by encoding and modulating a transmission bit string, and sub-carriers the complex symbols. After mapping to, OFDM symbols are constructed through inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion. In addition, when receiving data, the baseband processing unit 2k-20 divides the baseband signal provided from the RF processing unit 2k-10 into units of OFDM symbols, and transmits to the subcarriers through fast Fourier transform (FFT) operation. After restoring the mapped signals, the received bit stream is reconstructed through demodulation and decoding.

The baseband processor 2k-20 and the RF processor 2k-10 transmit and receive signals as described above. Accordingly, the baseband processor 2k-20 and the RF processor 2k-10 may be referred to as a transmitter, a receiver, a transceiver, or a communicator. Furthermore, at least one of the baseband processor 2k-20 and the RF processor 2k-10 may include a plurality of communication modules to support a plurality of different radio access technologies. Further, at least one of the baseband processor 2k-20 and the RF processor 2k-10 may include different communication modules to process signals of different frequency bands. For example, the different radio access technologies may include LTE networks, NR networks, and the like. Also, the different frequency bands may include a super high frequency (SHF) band (eg, 2.5 GHz, 5 Ghz), and a millimeter wave (eg, 60 GHz) band.

The storage unit 2k-30 stores data such as a basic program, an application program, and setting information for the operation of the terminal. The storage unit 2k-30 provides stored data at the request of the control unit 2k-40.

The control unit 2k-40 controls overall operations of the terminal. For example, the control unit 2k-40 transmits and receives signals through the baseband processing unit 2k-20 and the RF processing unit 2k-10. Further, the control unit 2k-40 records and reads data in the storage unit 2k-40. To this end, the control unit 2k-40 may include at least one processor. For example, the controller 2k-40 may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls an upper layer such as an application program.

2L illustrates a block configuration of TRP in a wireless communication system to which an embodiment of the present invention can be applied.

As shown in the figure, the base station includes an RF processing unit 2l-10, a baseband processing unit 2l-20, a backhaul communication unit 2l-30, a storage unit 2l-40, and a control unit 2l-50 It is configured to include.

The RF processor 2l-10 performs a function for transmitting and receiving a signal through a wireless channel such as band conversion and amplification of the signal. That is, the RF processor 2l-10 up-converts the baseband signal provided from the baseband processor 2l-20 into an RF band signal, transmits it through an antenna, and transmits an RF band signal through the antenna. Downconverts to baseband signal. For example, the RF processor 2l-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, and an ADC. In the figure, only one antenna is shown, but the first access node may include multiple antennas. Also, the RF processor 2l-10 may include a plurality of RF chains. Furthermore, the RF processor 2l-10 may perform beamforming. For the beamforming, the RF processor 2l-10 may adjust the phase and magnitude of each of signals transmitted and received through multiple antennas or antenna elements. The RF processing unit may perform a downlink MIMO operation by transmitting one or more layers.

The baseband processor 2l-20 performs a conversion function between a baseband signal and a bit stream according to a physical layer standard of the first wireless access technology. For example, during data transmission, the baseband processor 2l-20 encodes and modulates a transmission bit string to generate complex symbols. In addition, when receiving data, the baseband processing unit 2l-20 restores a received bit stream through demodulation and decoding of the baseband signal provided from the RF processing unit 2l-10. For example, according to the OFDM scheme, when transmitting data, the baseband processor 2l-20 generates complex symbols by encoding and modulating a transmission bit string, mapping the complex symbols to subcarriers, and then IFFT OFDM symbols are constructed through arithmetic and CP insertion. In addition, when receiving data, the baseband processor 2l-20 divides the baseband signal provided from the RF processor 2l-10 into units of OFDM symbols and restores signals mapped to subcarriers through FFT operation. After that, the received bit stream is restored through demodulation and decoding. The baseband processor 2l-20 and the RF processor 2l-10 transmit and receive signals as described above. Accordingly, the baseband processing unit 2l-20 and the RF processing unit 2l-10 may be referred to as a transmission unit, a reception unit, a transmission/reception unit, a communication unit, or a wireless communication unit.

The communication unit 2l-30 provides an interface for performing communication with other nodes in the network.

The storage unit 2l-40 stores data such as a basic program, an application program, and setting information for the operation of the main station. In particular, the storage unit 2l-40 may store information about bearers allocated to the connected terminal, measurement results reported from the connected terminal, and the like. In addition, the storage unit 2l-40 may store information serving as a criterion for determining whether to provide or stop multiple connections to the terminal. Then, the storage unit 2l-40 provides stored data at the request of the control unit 2l-50.

The control unit 2l-50 controls overall operations of the main station. For example, the control unit 2l-50 transmits and receives signals through the baseband processing unit 2l-20 and the RF processing unit 2l-10 or through the backhaul communication unit 2l-30. In addition, the control unit 2l-50 records and reads data in the storage unit 2l-40. To this end, the control unit 2l-50 may include at least one processor.

In the specific embodiments of the present disclosure described above, components included in the present disclosure are expressed in singular or plural according to the specific embodiments presented. However, the singular or plural expressions are appropriately selected for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural components, and even the components expressed in plural are composed of singular or Even the expressed components may be composed of a plurality.

On the other hand, the embodiments of the present disclosure disclosed in the specification and drawings are merely to provide a specific example to easily describe the technical content of the present disclosure and to understand the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art to which other modifications based on the technical spirit of the present disclosure can be practiced. In addition, each of the above embodiments can be operated in combination with each other as necessary. For example, some of the methods proposed in the present disclosure may be combined with each other to operate a base station and a terminal. In addition, although the above embodiments have been presented based on the 5G and NR systems, other modifications based on the technical idea of the above embodiments may be implemented in other systems such as LTE, LTE-A, and LTE-A-Pro systems.

In the specific embodiments of the present invention described above, the components included in the present invention are expressed in singular or plural according to the specific embodiments presented. However, the singular or plural expressions are appropriately selected for the situation presented for convenience of explanation, and the present invention is not limited to the singular or plural components, and even the components expressed in plural are composed of singular or Even the expressed components may be composed of a plurality.

On the other hand, in the drawings for explaining the method of the present invention, the order of explanation does not necessarily correspond to the order of execution, and the precedence relationship may be changed or executed in parallel.

Or, the drawings for explaining the method of the present invention may include some of the components and some of the components are omitted without departing from the scope of the present invention.

In the specific embodiments of the present invention described above, the components included in the present invention are expressed in singular or plural according to the specific embodiments presented. However, the singular or plural expressions are appropriately selected for the situation presented for convenience of explanation, and the present invention is not limited to the singular or plural components, and even the components expressed in plural are composed of singular or singular Even the expressed components may be composed of a plurality.

On the other hand, in the detailed description of the present invention, although specific embodiments have been described, various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the claims to be described later, but also by the scope and equivalents of the claims.

Claims (1)

In the control signal processing method in a wireless communication system,
Receiving a first control signal transmitted from a base station;
Processing the received first control signal; And
And transmitting a second control signal generated based on the processing to the base station.

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