KR102164038B1 - Methods for controlling SCell state and Apparatuses thereof - Google Patents

Abstract

The present disclosure relates to a technology in which a terminal configuring carrier aggregation changes or controls a state of a secondary cell. In an embodiment, in a method for a terminal to control a state of a secondary cell, a receiving step of receiving SCell state indication information indicating a state of a secondary cell (SCell) from a base station through an RRC message or a MAC control element When the and SCell state indication information indicate the Dormant state, the control step of controlling the state of the secondary cell to the dormant state and the dormant state that is set separately from the activation state CQI report period parameter and dormant according to the CQI report period parameter It provides a method and apparatus including a transmitting step of transmitting a reporting of channel state information for a state secondary cell.

Description

A method and apparatus for controlling a secondary cell state TECHNICAL FIELD

The present disclosure relates to a technology in which a terminal configuring carrier aggregation changes or controls a state of a secondary cell.

Next-generation mobile communication technologies are being studied in accordance with the demand for large-capacity data processing and high-speed data processing. For example, in a mobile communication system such as LTE (Long Term Evolution), LTE-Advanced, and 5G of the current 3GPP series, a high-speed and large-capacity communication system capable of transmitting and receiving various data such as video and wireless data beyond voice-oriented services. Is being demanded.

In order to handle this request, a carrier aggregation technology has been developed for transmitting and receiving data by merging a plurality of carriers between a terminal and a base station.

However, in order to transmit and receive data through carrier aggregation, a complicated procedure such as a terminal measuring the quality of a target carrier, reporting the base station, selecting a carrier by the base station, and determining a carrier aggregation are required.

In addition, when a secondary cell configured through carrier aggregation performs a state transition from an inactive state to an active state, it is a complicated procedure and a certain delay in order to transmit and receive data using the secondary cell after the state transition to the active state is completed. I need this.

This time delay is a factor that decreases service satisfaction for users and networks.

In the above-described background, the present disclosure is to provide a technique for allowing a secondary cell to configure a dormant state to enable a fast state transition.

In addition, the present disclosure is to provide a specific operation and procedure for performing state control on a secondary cell.

In an embodiment devised to solve the above-described problem, in a method for a terminal to control a state of a secondary cell, an RRC message or SCell state indication information indicating a state of a secondary cell (SCell) from a base station When the receiving step received through the MAC control element and the SCell state indication information indicate the Dormant state, the control step of controlling the state of the secondary cell to the dormant state and the activation state CQI report period parameter are set separately. It provides a method including a transmission step of transmitting a channel state information reporting for a secondary cell in a dormant state according to a dormant state CQI report period parameter.

In addition, in an embodiment, in a method for a base station to control a state of a secondary cell of a terminal, SCell state indication information indicating a state of a secondary cell (SCell) to the terminal is transmitted through an RRC message or a MAC control element. When the secondary cell is configured in the Dormant state according to the transmitting step and SCell state indication information to be transmitted, the secondary cell in the dormant state is determined according to the dormant state CQI report period parameter set separately from the active state CQI report period parameter. It provides a method including a receiving step of receiving a channel state information reporting.

In addition, in an embodiment, in a terminal controlling a state of a secondary cell, a receiver for receiving SCell state indication information indicating a state of a secondary cell (SCell) from a base station through an RRC message or a MAC control element, and When the SCell state indication information indicates the Dormant state, the control unit for controlling the state of the secondary cell to the dormant state and the dormant state CQI report period parameter set separately from the activation state CQI report period parameter. It provides a terminal device including a transmitter for transmitting reporting of channel state information for a secondary cell.

In addition, in an embodiment, in the base station controlling the state of the secondary cell of the terminal, the SCell state indication information indicating the state of the secondary cell (SCell) is transmitted to the terminal through an RRC message or a MAC control element. When the secondary cell is configured in the Dormant state according to the transmitter and the SCell state indication information, channel state information for the secondary cell in the dormant state according to the dormant state CQI report period parameter set separately from the active state CQI report period parameter It provides a base station apparatus including a receiver for receiving reporting.

The present disclosure defines a dormant state of a secondary cell constituting carrier aggregation to provide an effect of rapidly performing an operation even when it is changed to an active state.

In addition, the present disclosure provides an effect of removing ambiguity in operation by defining specific methods and signals for changing the state of the secondary cell including the dormant state.

1 is a diagram for describing an operation of a terminal according to an embodiment.
2 is a diagram illustrating an example of an RRC message including SCell state indication information according to an embodiment.
3 is a diagram for describing an operation of controlling a state of a secondary cell through an RRC message according to an embodiment.
4 is a diagram showing the format of a MAC control element (MAC control element, MAC CE) according to an embodiment.
5 is a diagram illustrating a format of a MAC CE according to another embodiment.
6 is a diagram illustrating a process of changing a state of a secondary cell according to a MAC CE including SCell state indication information according to an embodiment.
7 is a diagram for explaining classification of logical channel identifier (LCID) values according to an embodiment.
FIG. 8 is a diagram for describing an operation of determining a state of a secondary cell when all different MAC CEs are received according to an embodiment.
9 is a diagram for describing an operation of a base station according to an embodiment.
10 is a diagram illustrating a list of logical channel identifier (LCID) values for a DL-SCH according to an embodiment.
11 is a diagram illustrating an exemplary format of a MAC CE according to another embodiment.
12 is a diagram illustrating a format of a MAC PDU including a MAC header and a MAC payload according to an embodiment.
13 is a diagram illustrating an exemplary MAC sub-header format.
14 is a view for explaining timing according to reception of each of the activation state, the dormant state, and the deactivation state indication information for a secondary cell according to an embodiment.
15 is a diagram illustrating a configuration of a terminal according to an embodiment.
16 is a diagram illustrating a configuration of a base station according to an embodiment.

Hereinafter, some embodiments of the present disclosure will be described in detail through exemplary drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, a detailed description thereof will be omitted.

In the present specification, a wireless communication system refers to a system for providing various communication services such as voice and packet data. The wireless communication system includes a user equipment (UE) and a base station (BS).

A user terminal is a generic concept that refers to a terminal in wireless communication, as well as UE (User Equipment) in WCDMA, LTE, HSPA, and IMT-2020 (5G or New Radio), as well as MS (Mobile Station) and UT in GSM. It should be interpreted as a concept that includes all of (User Terminal), SS (Subscriber Station), and wireless device.

A base station or cell generally refers to a station that communicates with a user terminal, and Node-B (Node-B), evolved Node-B (eNB), gNB (gNode-B), LPN (Low Power Node) ), Sector, Site, various types of antennas, BTS (Base Transceiver System), Access Point, Points (e.g., Transmit Point, Receiving Point, Transceiver Point), Relay Node ( Relay Node), mega cell, macro cell, micro cell, pico cell, femto cell, RRH (Remote Radio Head), RU (Radio Unit), small cell, etc.

In the various cells listed above, since there is a base station controlling each cell, the base station can be interpreted in two meanings. 1) In relation to the radio area, the device itself may provide a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, and a small cell, or 2) the radio area itself may be indicated. In 1), all devices that are controlled by the same entity that provide a predetermined wireless area are controlled by the same entity, or all devices that interact to form a wireless area in collaboration are instructed to the base station. Points, transmission/reception points, transmission points, reception points, etc. are an embodiment of the base station according to the configuration method of the wireless area. In 2), it is possible to instruct the base station to the radio region itself that receives or transmits a signal from the viewpoint of the user terminal or the viewpoint of a neighboring base station.

In the present specification, a cell refers to a component carrier having coverage of a signal transmitted from a transmission/reception point or a coverage of a signal transmitted from a transmission/reception point, and the transmission/reception point itself. I can.

In the present specification, the user terminal and the base station are two (Uplink or Downlink) transmission/reception subjects used to implement the technology or technical idea described in the present invention, and are used in a comprehensive sense, and are not limited by a specific term or word. Does not.

Here, the uplink (Uplink, UL, or uplink) refers to a method of transmitting and receiving data to the base station by the user terminal, and the downlink (Downlink, DL, or downlink) is transmitting and receiving data to the user terminal by the base station. It means the way to do it.

For uplink transmission and downlink transmission, a Time Division Duplex (TDD) scheme transmitted using different times may be used, and a frequency division duplex (FDD) scheme transmitted using different frequencies, a TDD scheme and an FDD scheme Mixed use methods can be used.

In addition, in a wireless communication system, a standard is configured by configuring uplink and downlink based on one carrier or carrier pair.

In the uplink and downlink, control information is transmitted through a control channel such as Physical Downlink Control CHannel (PDCCH), Physical Uplink Control CHannel (PUCCH), and the like, and physical downlink shared channel (PDSCH), physical uplink shared channel (PUSCH), etc. It is configured with the same data channel to transmit data.

Downlink may refer to a communication or communication path from multiple transmission/reception points to a terminal, and uplink may refer to a communication or communication path from a terminal to multiple transmission/reception points. In this case, in the downlink, the transmitter may be a part of the multiple transmission/reception points, and the receiver may be a part of the terminal. In addition, in the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of the multiple transmission/reception points.

Hereinafter, a situation in which signals are transmitted/received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH may be expressed in the form of “transmitting and receiving PUCCH, PUSCH, PDCCH, and PDSCH”.

Meanwhile, high layer signaling described below includes RRC signaling that transmits RRC information including RRC parameters.

The base station performs downlink transmission to the terminals. The base station is a physical downlink for transmitting downlink control information such as scheduling required for reception of a downlink data channel, which is a main physical channel for unicast transmission, and scheduling approval information for transmission in an uplink data channel. Can transmit a control channel. Hereinafter, transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel.

There are no restrictions on the multiple access scheme applied in the wireless communication system. Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Non-Orthogonal Multiple Access (NOMA), OFDM-TDMA, OFDM-FDMA, Various multiple access techniques such as OFDM-CDMA can be used. Here, NOMA includes Sparse Code Multiple Access (SCMA) and Low Density Spreading (LDS).

An embodiment of the present invention is used in resource allocation in asynchronous wireless communication evolving to LTE/LTE-Advanced, IMT-2020 through GSM, WCDMA, HSPA, and synchronous wireless communication field evolving to CDMA, CDMA-2000 and UMB. Can be applied.

In this specification, a machine type communication (MTC) terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. Alternatively, in this specification, the MTC terminal may mean a terminal defined as a specific category for supporting low cost (or low complexity) and/or coverage enhancement.

In other words, in this specification, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category/type that performs an LTE-based MTC-related operation. Alternatively, in this specification, the MTC terminal supports improved coverage compared to the existing LTE coverage, or the UE category/type defined in the existing 3GPP Release-12 or lower supporting low power consumption, or a newly defined Release-13 low cost (or low complexity) may mean UE category/type. Or, it may mean a further enhanced MTC terminal defined in Release-14.

In the present specification, a NB-IoT (NarrowBand Internet of Things) terminal means a terminal that supports wireless access for cellular IoT. The objectives of the NB-IoT technology include improved indoor coverage, support for large-scale low-speed terminals, low latency sensitivity, ultra-low cost terminals, low power consumption, and an optimized network structure.

As representative usage scenarios in New Radio (NR), which is currently being discussed in 3GPP, eMBB (enhanced mobile broadband), mMTC (massive machine type communication), and URLLC (Ultra Reliable and Low Latency Communication) have been proposed.

In this specification, frequencies, frames, subframes, resources, resource blocks, regions, bands, subbands, control channels, data channels, synchronization signals, various reference signals, various signals, and various messages related to NR (New Radio) Can be interpreted as a meaning used in the past or present, or in various meanings used in the future.

Hereinafter, a description will be given of a technology for controlling a state of a secondary cell and a carrier aggregation according to the present disclosure.

In the present specification, a secondary cell refers to a cell that provides additional radio resources rather than a primary cell (PCell) that is a criterion for RRC connection when the terminal configures carrier aggregation. The secondary cell may be described as SCell, and the term is not limited. In addition, the content related to the state change of the secondary cell in the present specification is a general cell providing additional radio resources and may not be applied to a PSCell or a special cell.

Meanwhile, the activation state in the present specification refers to a state in which data can be transmitted/received by performing an operation of a general secondary cell. The deactivation state refers to a state in which the secondary cell is configured only in the terminal, and the transmission/reception operation for the secondary cell is not performed. The Dormant state is a state that is newly defined and refers to a state in which some operations of an active state and an inactive state are mixed. In this specification, the dormant state is referred to as FastActivation state, doment state, mid activation state, fast activation state, low power activation state, high power deactivation state, new SCell state, medium power SCell state, mid state, mid activated state, semi activated state, semi It can be replaced with any name such as deactivated state. Terms for the above-described state are exemplary and are not limited thereto.

In addition, the reporting of channel state information in the present specification includes information on a channel measured, estimated, or calculated by the terminal, and will be described as CSI reporting, CQI reporting, and the like. This is for convenience of description, and the channel state information reporting means reporting including at least one of CQI, PMI, RI, PTI, and CRI. In addition, below, if necessary, the channel state information reporting may be described as CSI reporting or CQI reporting, and should be interpreted as including all the aforementioned channel state information except for specific cases.

Carrier aggregation (CA) technology is a technology for boosting a data rate to a terminal through an additional carrier. The conventional CA technology has not been optimized from the viewpoint of delay in the secondary cell configuration and the activation state for the secondary cell.

For example, the base station instructs the UE to measure the frequency of a candidate cell that may be configured as a secondary cell before configuring a CA for the RRC connected state UE. When the terminal transmits the measurement report to the base station according to the reporting configuration, the base station additionally configures a secondary cell to the terminal based on the received measurement report. When the SCell is configured in the terminal, the SCell is configured in an inactive state.

Thereafter, the base station was able to transmit user data by activating the secondary cell in consideration of another measurement report for the cell and the amount of transmitted/received data.

If the secondary cell is deactivated, it does not transmit SRS to the secondary cell (not transmit SRS on the SCell), not transmit on the UL-SCH of the secondary cell (not transmit on UL-SCH on the SCell), and Without transmitting on the RACH (not transmit on RACH on the SCell), CQI (channel quality indicator)/PMI (Precoding Matrix Indicator)/RI (Rank Indicator)/PTI (Procedure Transaction Identifier)/CRI ( CSI-RS Resource Indicator) without reporting (not report CQI/PMI/RI/PTI for the SCell), without monitoring on the secondary cell (not monitor the PDCCH on the SCell), PDCCH monitoring for the secondary cell (Not monitor the PDCCH for the SCell).

If the secondary cell is activated, normal secondary cell operation is performed. For example, the active secondary cell may perform SRS transmission, CQI/PMI/RI/PTI/CRI reporting for SCell, PDCCH monitoring, PUCCH transmission, and the like.

MAC CE is used to transition the conventional SCell to the active state. When the UE receives the MAC CE for activating the SCell in subframe n, the UE should be able to apply the SCell activation operation up to n+24 or n+34 subframes. Related timing standards are as follows.

When the UE receives an activation command for a secondary cell in subframe n, the corresponding actions are more than the minimum requirements defined in 3GPP TS 36.133, except for the following operations that must be applied to subframe n+8. (When a UE receives an activation command for a secondary cell in subframe n, the corresponding actions in [36.321] shall be applied no later than the minimum requirement defined. in [36.133] and no earlier than subframe n+8, except for the following:)

-Actions related to CSI reporting on a serving cell which is active in subframe n+8 on one serving cell active in subframe n+8

-Actions related to the sCellDeactivationTimer associated with the secondary cell

The above two operations should be applied to subframe n+8. (which shall be applied in subframe n+8.)

-Actions related to CSI reporting on a serving cell which is not active in subframe n+8 on a serving cell that is not active in subframe n+8

The above operation should be applied to the fastest subframe after n+8 subframe in which the serving cell is active (which shall be applied in the earliest subframe after n+8 in which the serving cell is active).

The minimum requirements defined in related 3GPP TS36.133 are as follows.

In the case of SCell activation delay requirement, if the UE sends a valid measurement report for a period equal to max (5 measCycleSCell, 5 DRX cycles) before receiving the SCell activation command and the SCell remains in a detectable state, it will not be later than subframe n+24. Otherwise, the UE should be able to apply the operation no later than subframe n+34. (Upon receiving SCell activation command in subframe n, the UE shall be capable to transmit valid CSI report and apply actions related to the activation command as specified for the SCell being activated no later than in subframe n+24 provided the following conditions are met for the SCell:

-During the period equal to max(5 measCycleSCell, 5 DRX cycles) before the reception of the SCell activation command:

-the UE has sent a valid measurement report for the SCell being activated and

-the SCell being activated remains detectable according to the cell identification conditions specified in section 8.3.3.2,

-SCell being activated also remains detectable during the SCell activation delay according to the cell identification conditions specified in section 8.3.3.2.

Otherwise upon receiving the SCell activation command in subframe n, the UE shall be capable to transmit valid CSI report and apply actions related to the activation command for the SCell being activated no later than in subframe n+34 provided the SCell can be successfully detected on the first attempt.)

In this way, after the UE receives the MAC CE indicating SCell activation, there has been a significant delay until data is transmitted through the SCell. That is, 24-34 ms was consumed to perform effective data scheduling based on valid CQI reporting.

When the deactivated SCell is activated, the UE performs RF retuning, initial CQI measurement, and CQI reporting. As one of the methods for rapidly switching the SCell to the active state, a method of estimating an initial effective CQI and reducing the reporting time may be considered. This method may be provided by measuring or reporting periodic CQI for the SCell in which the UE is configured. However, this has a problem that causes power consumption because periodic CQI must be measured or reported. In another way, by defining a new state that does not perform (or stops) some of the activation state operations that cause power consumption, the SCell can be quickly switched to the activated state and data can be transmitted. However, when a new state is defined in the SCell, complex operations such as a transition between a new SCell state and an existing active state, and a transition between a new SCell state and an existing inactive state may be required.

As described above, the new state is described as a dormant state in this specification, and an operation of a terminal and a base station for a transition operation between states is proposed.

As described above, in the conventional CA technology, there is a problem that there is no significant delay until an idle (IDLE) state terminal transitions to an RRC connected state to configure carrier aggregation and transmit real user data through an additionally configured cell through this. In particular, there was a significant delay before the terminal transmits data through the SCell after receiving the MAC CE indicating SCell activation. In order to improve this, a method of estimating the initial effective CQI and reducing the reporting time can be considered, but a specific method for actual implementation of this has not been presented, and there is a problem of causing power consumption. By defining a new state that does not perform (or stops) some of the activation state operations that cause power consumption, the SCell can quickly switch to the active state and transmit data, but no specific method has been provided for this.

The present disclosure devised to solve this problem is to provide a specific method and apparatus for reducing the delay until data transmission through the SCell after the UE is instructed by the MAC CE indicating SCell activation. In addition, when defining the dormant state, it aims to provide a specific procedure and method for transferring data by transitioning to the active state using the corresponding state or transitioning to the inactive state.

Meanwhile, for convenience of understanding, embodiments of the present invention will be described below based on LTE radio access technology. However, the contents described below may be applied to 5G NR or other radio access technology as well as LTE radio access technology. Hereinafter, known techniques will be omitted for description. For the omitted description or some information elements, refer to the information elements specified in TS 36.331, the RRC standard. In addition, in relation to terminal operations, some terminal operations include operations specified in TS 36.321, which is the MAC standard. Even if the contents of the terminal operation related to the definition of the corresponding information element are not included in the specification, the contents may be included in the present disclosure or used as a claim.

1 is a diagram for describing an operation of a terminal according to an embodiment.

Referring to FIG. 1, the terminal controlling the state of the secondary cell performs a reception step of receiving SCell state indication information indicating the state of the secondary cell (SCell) from the base station through an RRC message or a MAC control element. It can be performed (S100).

For example, the UE may receive SCell status indication information through higher layer signaling or MAC CE. Higher layer signaling may mean an RRC message. Higher layer signaling and MAC CE may be received according to circumstances such as whether the terminal is configured with a SCell.

As an example, when the terminal receives the RRC connection reconfiguration message for configuring the secondary cell, SCell state indication information may be included. For example, the SCell state indication information received through the RRC message may be configured with a 1-bit parameter indicating the active state or the dormant state. If the configuration information for configuring the secondary cell is included through the RRC message, but the parameter for the SCell state indication information is not included in the configuration information, the UE may configure the secondary cell in an inactive state. Thereafter, the terminal may control the state of the secondary cell according to the SCell state indication information received through the MAC CE.

As another example, after the terminal configures the secondary cell, the state indication information for the secondary cell may be dynamically received by the MAC CE through the SCell state indication information. For example, the MAC control element including the SCell state indication information may be configured in a format including a field for indicating the state of the secondary cell as an active state or a dormant state for each secondary cell index. Alternatively, the MAC control element including the SCell state indication information may be configured in a format including a field for indicating the state of the secondary cell as an active state or an inactive state for each secondary cell index.

In other words, the MAC control element includes a first MAC control element configured to indicate a state for each secondary cell index as an active state or an inactive state, and a second MAC control element configured to indicate a state for each secondary cell index as a dormant state or an active state. It can be classified as In this case, the first MAC control element and the second MAC control element are identified by MAC PDU subheaders having different LCIDs (Logical Channel ID). For example, the first MAC control element may be identified by a MAC PDU subheader having an Activation/Deactivation LCID value. Further, the second MAC control element may be identified by a MAC PDU subheader having a Hibernation LCID value. As described above, the first MAC control element and the second MAC control element are arbitrary terms for distinguishing the MAC CE, and are not limited thereto. That is, the first MAC control element may be described as Activation/Deactivation MAC CE, and the second MAC control element may be described as Hibernation MAC CE.

Message reception and processing operations according to each situation will be described in more detail with reference to the drawings below.

Meanwhile, when the SCell state indication information indicates the Dormant state, the UE may perform a control step of controlling the state of the secondary cell to the dormant state (S120).

For example, the UE checks whether the SCell state indication information is included in the RRC message or the MAC CE, and controls the state of the secondary cell according to the SCell state indication information. For example, when the SCell state indication information indicates a dormant state, the terminal may configure the state of the secondary cell as a dormant state or control a state transition operation to be performed in the dormant state.

For example, when the RRC message for configuring the secondary cell to the terminal is received and the SCell state indication information is included in the RRC message, the UE may configure the secondary cell in a state indicated by the SCell state indication information. That is, when the terminal configures the secondary cell in the terminal, it may be configured in an active state or a dormant state according to the SCell state indication information. If the SCell state indication information is not included in the RRC message for configuring the secondary cell, the UE may configure the secondary cell in an inactive state.

As another example, the terminal may receive a MAC CE indicating the state of the configured secondary cell. For example, the MAC control element including the SCell state indication information may include a field for indicating the state of the secondary cell as an active state or a dormant state for each secondary cell index.

Specifically, if the value of the index field for the secondary cell is set to a value indicating the activation state, and the state of the secondary cell indicated by the index is a dormant state, the terminal transitions the state of the secondary cell to the activated state. can do.

Alternatively, the terminal may ignore the value of the index field when the value of the index field for the secondary cell is set to a value indicating the active state, and the state of the secondary cell is not a dormant state. That is, the current state of the secondary cell can be maintained.

As another example, two types of MAC CE may exist: a first MAC CE and a second MAC CE as described above. In the case of the first MAC CE, the state of the secondary cell is indicated to be activated or deactivated, and the UE may control the state of the secondary cell according to the indication information. In the case of the second MAC CE, this is to indicate the state of the secondary cell as an active or dormant state, and the terminal may control the state of the secondary cell according to the aforementioned index field value and the current state of the secondary cell.

In addition, the UE needs to assume that both the above-described first MAC CE and second MAC CE messages are received. In this case, the UE may determine the state of the secondary cell by combining values of the secondary cell index field indicated by the two MAC CEs. For example, it may be determined whether the SCell state indication information indicates the dormant state according to a combination of the value of the index field for the secondary cell included in each of the MAC control element and the second control element.

On the other hand, the terminal may perform a transmission step of transmitting a channel state information reporting on the dormant secondary cell according to the dormant state CQI report period parameter set separately from the active state CQI report period parameter (S130).

For example, when the secondary cell is in a dormant state, the terminal may report channel state information for the secondary cell. Specifically, the UE may report CQI/PMI/RI/PTI/CRI for the dormant secondary cell. However, the terminal controls not to transmit the SRS in the dormant secondary cell. In addition, the UE does not transmit UL-SCH and does not transmit RACH in the dormant secondary cell. In addition, the terminal does not monitor the PDCCH in the dormant secondary cell, nor does it monitor the PDCCH for the dormant secondary cell. Of course, the UE also does not perform PUCCH transmission in the dormant secondary cell.

In summary, when the secondary cell is configured or transitioned to the dormant state, the terminal reports channel state information for the secondary cell to the base station, but does not perform the remaining operations in the same manner as in the inactive state. Thus, the dormant state is similar to the inactive state in which some of the operations in the active state are performed.

The UE may use the CQI report period parameter to report the channel state information for the dormant secondary cell. For example, the terminal reports channel state information to the base station at a period set according to the CQI report period parameter. In this case, the CQI report period parameter for transmitting the channel state information for the dormant secondary cell is distinct from the CQI report period parameter for transmitting the channel state information for the active secondary cell. That is, the terminal may receive the activation state CQI report period parameter and the dormant state CQI report period parameter, respectively, and periodically transmit the channel state information by applying a specific period parameter according to the state of the secondary cell.

As described above, according to the present disclosure, the terminal may control the state of the secondary cell to a dormant state, an active state, or an inactive state. In addition, the terminal transmits channel state information on the secondary cell in the dormant state to the base station, thereby reducing the delay time when the secondary cell is transitioned to the active state and used.

Hereinafter, the above-described terminal operation will be described in more detail with reference to the drawings.

2 is a diagram illustrating an example of an RRC message including SCell state indication information according to an embodiment.

Referring to FIG. 2, the UE may receive an RRC connection reconfiguration message including configuration information indicating the configuration of the secondary cell from the base station. In this case, the secondary cell configuration information may include SCell state indication information as one parameter. For example, the SCell state indication information may be configured with a 1-bit parameter for indicating the state of the additionally configured secondary cell as an active state or a dormant state.

Through this, the terminal can set the initial state for the secondary cell configured by checking the SCell state indication information (ex, sCellState-r15). The specific operation will be described with reference to FIG. 3 below.

3 is a diagram for describing an operation of controlling a state of a secondary cell through an RRC message according to an embodiment.

Referring to FIG. 3, the UE receives an RRC message for adding or configuring a secondary cell from a base station (S300). For example, the network can configure the configured SCell to sleep or instruct to transition. To this end, the network (base station) can use an RRC message.

The SCell configured as an example may be controlled in an inactive state when added/configured or initially after handover. As another example, in order to quickly transmit user data through the configured SCell, the UE may receive an RRC connection reconfiguration message including SCell status indication information indicating the SCell activation state for the SCell from the base station. In this case, the UE may be configured to be activated initially when adding/configuring the corresponding SCell or after handover. As another example, in order to quickly transition the configured SCell to the SCell activation state, the terminal may receive an RRC connection reconfiguration message including information indicating the dormant state for the corresponding SCell from the base station. In this case, the terminal may be configured to sleep when adding/configuring the corresponding SCell or initially after handover.

For the above operation, when the RRC message is received, the UE determines whether SCell status indication information is included (S310).

For example, the SCell state indication information may be included as one information element in common SCell configuration information (e.g. commonSCellconfig) applied to a specific SCells group and applied to a specific SCell group. For another example, the SCell state indication information may be included as one information element in SCell configuration information (e.g. SCellToAddMod) applied to an individual SCell and applied to a specific SCell.

Meanwhile, the SCell state indication information is composed of 2 bits, and may be instructed to indicate one of an active state, an inactive state, and a dormant state for the corresponding SCell. In the case of 2 bits, one value can be set as a spare value. For example, the SCell state indication information may be composed of SCellstate ENUMERATE {activate, deactivate, dormant, spare}.

Alternatively, the SCell status indication information is composed of 1 bit, and may be instructed to indicate one of an active state and a dormant state for the corresponding SCell. For example, the SCell state indication information may be composed of SCellstate ENUMERATE {activate, dormant} or SCellstate ENUMERATE {TRUE(activate), FALSE(dormant}. In this case, the corresponding information element (eg SCellstate) is OPTIONAL) Therefore, if the SCell state indication information is not included in the above-described SCell configuration information, the secondary cell may be configured in an inactive state at the time of adding or configuring an SCell or initially after handover as in the prior art. (S320).

If the SCell status indication information exists, the terminal may determine whether the SCell status indication information indicates an activation status (S330). When the SCell state indication information is set to a value indicating the activation state, the UE configures the corresponding secondary cell in the activated state (S340).

In contrast, when the SCell state indication information is not set to a value indicating an active state, that is, when it is set to a value indicating a dormant state, the UE configures the corresponding secondary cell to the dormant state (S350).

For example, if an RRC message including information indicating a dormant state for an SCell is received, the UE does not transmit an SRS on the corresponding SCell. In addition, the terminal does not transmit information through the UL-SCH in the corresponding SCell. In addition, the UE does not transmit information through RACH on the corresponding SCell. In addition, the UE does not monitor the PDCCH on the corresponding SCell. In addition, the UE does not transmit PUCCH on the corresponding SCell. If the SCell deactivation timer (sCellDeactivationTimer) associated with the corresponding SCell is running, the terminal stops/stops it. In addition, the terminal flushes all HARQ buffers associated with the corresponding SCell. Alternatively, the terminal stops/stops a SCell deactivation timer (sCellDeactivationTimer) associated with the corresponding SCell, and flushes all HARQ buffers associated with the corresponding SCell.

However, the terminal according to the period indicated by the periodic CQI reporting configuration in the dormant state (e.g., one or more of period information, CQI PUCCH resource information, CQI format indication information, and parameter information capable of calculating period information). Transmits channel state information for the corresponding SCell. Channel state information includes CQI/PMI/RI/PTI/CRI.

In this way, the terminal may determine and control the state of the configured secondary cell based on the SCell state indication information when configuring the secondary cell.

Meanwhile, the terminal may change the state of the configured secondary cell through the MAC CE received from the base station.

4 is a diagram showing the format of a MAC control element (MAC control element, MAC CE) according to an embodiment. 5 is a diagram illustrating a format of a MAC CE according to another embodiment.

4 and 5, the MAC control element (MAC CE) may be configured in a format including a field for indicating a state of a secondary cell as an active state or a dormant state for each secondary cell index.

Each format consists of a reserve bit (R) and a bit (C _i ) divided by the index of each cell. In the case of FIG. 4, a maximum of 7 secondary cell indices may be indicated, and in the case of FIG. 5, a maximum of 31 secondary cell indices may be indicated. Specifically, the MAC CE of one octet is identified by the MAC PDU subheader. The MAC CE has a fixed size and consists of a single octet containing 7 C fields and one R field. The MAC CE of 4 octets is identified by the MAC PDU subheader. MAC CE has a fixed size and consists of 4 octets including 31 C fields and one R field.

The terminal may check the index of the corresponding secondary cell, check the bit value of the corresponding index, and determine whether or not the state transition for the corresponding secondary cell.

For example, when the value of the index field for the secondary cell is set to a value indicating the activation state, and the state of the secondary cell is in the dormant state, the terminal may transition the state of the secondary cell to the activated state.

As another example, when the value of the index field for the secondary cell is set to a value indicating the active state, and the state of the secondary cell is not in the dormant state, the terminal may ignore the value of the index field and maintain the state at the time of reception. have.

6 is a diagram illustrating a process of changing a state of a secondary cell according to a MAC CE including SCell state indication information according to an embodiment.

Referring to FIG. 6, when no serving cell index (ServCellIndex) is greater than 8, MAC CE of one octet is applied. Otherwise, the MAC CE of 4 octets described above is applied. Here, the Ci field indicates the state of the SCell configured with SCellIndex i, if there is a SCell configured with SCell index i. Otherwise, the MAC entity must ignore the Ci field.

For example, only the values of fields C1, C3, and C5 are exemplarily described. It is assumed that the SCell index 1 (C1) is in an inactive state at the time of receiving the corresponding MAC CE, the SCell index 3 (C3) is in the dormant state, and the SCell index 5 (C5) is in the active state.

The Ci field is set to "1" to indicate that the SCell with SCellIndex i should transition to the dormant state. The Ci field is set to "0" to indicate that the SCell with SCellIndex i should be activated. R field is set to "0" as a reserved bit.

Upon receiving the MAC CE, the UE determines a state transition using the current state of the secondary cell having the corresponding SCell index and an indication value indicated by the MAC CE.

For example, when the value of the index field for the secondary cell is set to a value indicating the activation state (ex, "0"), and the state of the secondary cell is in the dormant state, the terminal transitions the state of the secondary cell to the activated state. can do. That is, since C3 is set to 0, the terminal transitions the secondary cell of the dormant state of the SCell index of 3 to the active state.

As another example, the terminal ignores the value of the index field when the value of the index field for the secondary cell is set to a value indicating an activation state (ex, "0"), and the state of the secondary cell is not a dormant state. That is, although C1 is set to 0, since the secondary cell having the SCell index of 1 is not in the dormant state, the UE maintains the corresponding secondary cell in an inactive state.

As another example, when the index field value for the secondary cell is set to a value indicating the dormant state (ex, "1"), the UE transitions the state of the secondary cell to the dormant state. That is, since C5 is set to 1, the UE transitions the secondary cell having an SCell index of 5 to the dormant state.

In this way, the terminal controls the state of the secondary cell based on the MAC CE including information indicating either the active state or the dormant state.

However, as described above, the MAC CE may be divided into a MAC CE including a field indicating an activation state/sleep state and a MAC CE including a field indicating an activation state/deactivation state.

7 is a diagram for explaining classification of logical channel identifier (LCID) values according to an embodiment.

Referring to FIG. 7, a first MAC control element configured to indicate a state for each secondary cell index as an active state or an inactive state, and a second MAC control element configured to indicate a state for each secondary cell index as a dormant state or an active state. The first MAC control element and the second MAC control element may be identified by MAC PDU subheaders having different logical channel IDs (LCIDs).

For example, the MAC CE for indicating the state of the secondary cell as an active or inactive state is identified by a MAC PDU subheader having 11000 or 11011 as an LCID value. In addition, the MAC CE for indicating the state of the secondary cell to the active or dormant state is identified by a MAC PDU subheader having an LCID value of 10011 or 10100. In this way, the first MAC CE and the second MAC CE are identified by being classified by MAC PDU subheaders having different LCID values. In addition, it can be identified by being divided into different LCID values according to the MAC CE octet.

Meanwhile, as described above, there may be two types of MAC CE indicating the state of the secondary cell except for classification according to octets. For example, there may be a MAC CE for indicating an active state or an inactive state.

The MAC CE for indicating the activated state or the deactivated state may be configured in the same field format as in FIGS. 4 and 5 according to octets. However, as described above, it is classified according to the MAC PDU subheader value. For example, when no serving cell index (ServCellIndex) is greater than 8, one octet of activation/deactivation MAC CE is applied. Otherwise, 4 octets of activation/deactivation MAC CE is applied. Here, the Ci field indicates an activation/deactivation state of the SCell configured with SCellIndex i, if there is an SCell configured with SCell index i. Otherwise, the MAC entity must ignore the Ci field. The Ci field is set to "1" to indicate that the SCell with SCellIndex i should be activated. The Ci field is set to "0" to indicate that the SCell with SCellIndex i should be deactivated. R field is set to "0" as a reserved bit.

Accordingly, the terminal should also assume a case where both the MAC CE indicating the activated state or the deactivated state and the MAC CE indicating the activated state or the dormant state are received. When any one MAC CE is received, the UE can classify it according to the subheader of the MAC PDU including the MAC CE, and determine whether to transition to the state according to the aforementioned field value and the state of the corresponding cell. However, when two MAC CEs are received, a rule for confirming the state transition indication of the cell is required.

FIG. 8 is a diagram for describing an operation of determining a state of a secondary cell when all different MAC CEs are received according to an embodiment.

For example, when both the first MAC control element and the second MAC control element are received, the terminal SCell according to the combination of the value of the index field for the secondary cell included in each of the first MAC control element and the second control element. A value indicated by the state indication information can be determined.

Referring to FIG. 8, Hivernation MAC CE means a second control element indicating an activation state or a dormant state, and Activation/Deactivation MAC CE means a first control element indicating an activation state or a deactivation state.

In each MAC CE, a value of an individual SCell index field may be set to 0 or 1. In this case, the state of the secondary cell may be deactivated, activated, or transitioned to a dormant state as shown in FIG. 8 according to a combination of values of a specific SCell index field set in each MAC CE.

For example, if the field value for the specific SCell index of the second control element is 0, and the field value for the same specific SCell index of the first control element is 0, the corresponding secondary cell should be controlled in an inactive state. Likewise, if the field value of the second control element is 0 and the field value of the first control element is 1, the corresponding secondary cell should be controlled in an activated state. In addition, if the field value of the second control element is 1 and the field value of the first control element is 1, the secondary cell should be controlled in a dormant state. When the field value of the second control element is 1 and the field value of the first control element is 0, the state is reserved and can be used in the future.

On the other hand, when the state for a specific secondary cell is determined to be active, the MAC entity of the terminal does not transmit the SRS on the corresponding SCell.

The terminal is in the dormant state periodic CQI reporting configuration (e.g., one or more of period information, CQI PUCCH resource information, CQI format indication information, parameter information capable of calculating period information) according to the period indicated by the corresponding SCell CQI/PMI/RI/PTI/CRI is reported for. In addition, the terminal does not transmit information through the UL-SCH on the corresponding SCell. In addition, the UE does not transmit information through RACH on the corresponding SCell. In addition, the UE does not monitor the PDCCH on the SCell. In addition, the UE does not transmit PUCCH on the corresponding SCell.

If the SCell deactivation timer (sCellDeactivationTimer) associated with the corresponding SCell is running, the terminal stops/stops it. The terminal flushes all HARQ buffers associated with the corresponding SCell. Alternatively, when the SCell transitions from the active state to the dormant state, the terminal stops/stops the SCell deactivation timer (sCellDeactivationTimer) associated with the SCell. The terminal flushes all HARQ buffers associated with the corresponding SCell.

9 is a diagram for describing an operation of a base station according to an embodiment.

9, the base station controlling the state of the secondary cell of the terminal transmits the SCell state indication information indicating the state of the secondary cell (SCell) to the terminal through an RRC message or a MAC control element Performs (S900).

For example, the base station may transmit SCell status indication information through higher layer signaling or MAC CE. Higher layer signaling may mean an RRC message. Higher layer signaling and MAC CE may be transmitted according to circumstances such as whether the terminal is configured with a SCell.

As an example, when the base station transmits an RRC connection reconfiguration message for configuring the secondary cell to the terminal, SCell state indication information may be included. For example, the SCell state indication information transmitted through the RRC message may be configured with a 1-bit parameter indicating the active state or the dormant state. If the configuration information for configuring the secondary cell is included through the RRC message, but the parameter for the SCell state indication information is not included in the configuration information, the UE may configure the secondary cell in an inactive state. Thereafter, the base station may control the state of the secondary cell of the terminal according to the SCell state indication information transmitted through the MAC CE.

As another example, the base station may dynamically transmit SCell status indication information by the MAC CE after the terminal configures the secondary cell. For example, the MAC control element including the SCell state indication information may be configured in a format including a field for indicating the state of the secondary cell as an active state or a dormant state for each secondary cell index. Alternatively, the MAC control element including the SCell state indication information may be configured in a format including a field for indicating the state of the secondary cell as an active state or an inactive state for each secondary cell index.

In other words, the MAC control element includes a first MAC control element configured to indicate a state for each secondary cell index as an active state or an inactive state, and a second MAC control element configured to indicate a state for each secondary cell index as a dormant state or an active state. It can be classified as In this case, the first MAC control element and the second MAC control element are identified by MAC PDU subheaders having different LCIDs (Logical Channel ID).

When the secondary cell is configured in the Dormant state according to the SCell state indication information, the base station provides channel state information for the secondary cell in the dormant state according to the dormant state CQI report period parameter set separately from the activation state CQI report period parameter. A receiving step of receiving the reporting is performed (S910).

For example, when the secondary cell of the terminal is in a dormant state, the base station may receive channel state information for a corresponding secondary cell. Specifically, the base station may receive CQI/PMI/RI/PTI/CRI for the dormant secondary cell. However, as described above, the base station does not receive the SRS in the dormant secondary cell. In addition, the base station does not receive the UL-SCH in the dormant secondary cell and does not receive the RACH. In addition, the base station does not transmit the PDCCH in the dormant secondary cell and does not transmit the PDCCH for the dormant secondary cell. Of course, the base station also does not perform an operation for PUCCH reception in the dormant secondary cell.

The base station may transmit the CQI report period parameter to report the channel state information for the dormant secondary cell. For example, the base station receives channel state information from the terminal at a period set according to the CQI report period parameter. In this case, the CQI report period parameter for transmitting the channel state information for the dormant secondary cell is distinct from the CQI report period parameter for transmitting the channel state information for the active secondary cell. That is, the base station may transmit the activation state CQI report period parameter and the dormant state CQI report period parameter, respectively, and periodically receive channel state information by applying a specific period parameter according to the state of the secondary cell.

In addition, the base station may perform the base station operation for performing the operation of the terminal described with reference to FIGS. 1 to 8.

As described above, according to the present disclosure, the terminal may control the state of the secondary cell to a dormant state, an active state, or an inactive state according to the control of the base station. In addition, the terminal transmits channel state information on the secondary cell in the dormant state to the base station, thereby reducing the delay time when the secondary cell is transitioned to the active state and used.

Hereinafter, the above-described dormant state control method and control timing will be described in detail by dividing more various embodiments.

First, various embodiments of indicating a state of a secondary cell through MAC CE will be described.

The base station may transmit a MAC CE for indicating the dormant state for one or more SCells to the terminal.

First embodiment: Method for indicating the dormant state using R bits in the MAC CE field

For example, the base station may utilize an existing activation/deactivation MAC CE (or an existing activation/deactivation MAC CE format) to indicate a dormant state for the SCell configured in the terminal. For example, you can indicate:

The R field is set to "1" to indicate the dormant state distinguished from the active state.

If the R field is set to 1, the Ci field is set to "1" to indicate that the SCell with SCellIndex i should hibernate to the dormant state. Or, if hibernation is set to "0" in the dormant state, the remaining state is set to "1".

In this case, for example, if the R field is set to 1, the Ci field is set to "0" to indicate that the SCell with SCellIndex i should be deactivated.

In this case, as another example, if the R field is set to 1, the Ci field is set to "0" to indicate that the SCell with SCellIndex i should be activated.

In this case, as another example, if set regardless of the R field, the Ci field is set to "0" to indicate that the SCell with SCellIndex i should be deactivated.

In this case, as another example, the LCID value is the same as the existing activation/deactivation MAC CE (e.g., 1 octet activation/deactivation MAC CE is an LCID value of 11011, 4 octets activation/deactivation MAC CE is an LCID value of 11000). I can.

As another example, information for indicating the above-described operation (on/enable/configure/indicate) may be configured in the terminal through an RRC reconfiguration message.

Second embodiment: Method for indicating a dormant state using one (or a specific bit) of Ci fields in the MAC CE field

For example, the base station may use the existing activation/deactivation MAC CE (or the existing activation/deactivation MAC CE format) to indicate dormancy for the SCell configured in the terminal.

For example, one field or bit in the activation/deactivation MAC CE may be used to indicate sleep distinct from the activation state. For example, the field or bit is set to "1".

For another example, one specific Ci in the activation/deactivation MAC CE may be used to indicate a dormant state that is distinct from the activation state. For example, the field or bit is set to "1" (or a designated value).

For another example, a field or bit for indicating this may be configured in the terminal through an RRC connection reconfiguration message. For another example, information for indicating this operation (on/enable/configure/indicate) may be configured in the terminal through an RRC connection reconfiguration message. For another example, a field or bit for indicating this is configured in advance, and information for indicating a corresponding operation (on/enable/configure/indicate) may be configured in the terminal through an RRC connection reconfiguration message. For another example, the base station does not configure the SCell having the Scell index or the servecell index of the corresponding field in the terminal. Through this, the index can be used as a field or bit for indicating the above-described dormant state.

If the field or bit for indicating the dormant state is set to 1, the Ci field other than the field/bit for indicating the rest or dormant state indicates that the SCell with SCellIndex i should be in the dormant state. It is set to 1". Or, if you set "0" to hibernate in the dormant state, set the rest of the state to "1".

In this case, for example, if the field or bit for indicating the dormant state is set to "1", the Ci field other than the field/bit for indicating the rest or dormant is "" to indicate that the SCell with SCellIndex i should be deactivated. It is set to 0".

In this case, as another example, if the field or bit for indicating the dormant state is set to "1", the field for indicating the rest or dormancy or the Ci field other than the bit is "" to indicate that the SCell with SCellIndex i should be activated. It is set to 0".

In this case, as another example, if set irrespective of a field or bit indicating a dormant state, a Ci field other than a field/bit for indicating the rest or dormancy is set to "0" to indicate that the SCell with SCellIndex i should be deactivated. It is set.

In this case, as another example, the LCID value is the same as the existing activation/deactivation MAC CE (e.g., 1 octet activation/deactivation MAC CE is an LCID value of 11011, 4 octets activation/deactivation MAC CE is an LCID value of 11000). I can.

Third embodiment: Reserved LCID How to use values to indicate dormancy

As described above, for example, a new LCID different from the LCID of the existing activation/deactivation MAC CE may be allocated to indicate the dormant state.

For example, the base station uses the same format as the existing activation/deactivation MAC CE to indicate the dormant state for the SCell configured in the terminal, but may allocate an LCID that is distinct from the LCID of the existing activation/deactivation MAC CE. For example, you can indicate:

Here, the Ci field indicates the dormant state of the SCell configured with SCellIndex i, if there is a SCell configured with SCell index i. Otherwise, the MAC entity must ignore the Ci field. For example, the Ci field is set to "1" to indicate that the SCell with SCellIndex i should be controlled in a dormant state. The Ci field is set to "0" to indicate that the SCell with SCellIndex i should be deactivated.

For another example, the Ci field is set to "1" to indicate that the SCell with SCellIndex i should be controlled in a dormant state. The Ci field is set to "0" to indicate that the SCell with SCellIndex i should be activated.

For another example, the Ci field is set to "0" to indicate that the SCell with SCellIndex i should be controlled in a dormant state. The Ci field is set to "1" to indicate that the SCell with SCellIndex i should be activated.

R field is set to "0" as a reserved bit.

Meanwhile, the dormant/activation MAC CE and the dormant/deactivation MAC CE may be defined respectively, and a new LCID that is distinguished from the LCID of the existing activation/deactivation MAC CE may be assigned to indicate the dormant/activation and the dormant/deactivation.

In the case of dormant/activated MAC CE, if there is a SCell configured with SCell index (SCellIndex) i, this field indicates the dormant state of the SCell configured with SCellIndex i. Otherwise, the MAC entity must ignore the Ci field. For example, the Ci field is set to "1" to indicate that the SCell with SCellIndex i should be controlled in a dormant state. The Ci field is set to "0" to indicate that the SCell with SCellIndex i should be activated.

In the case of dormant/deactivated MAC CE, the Ci field indicates the dormant state of the SCell configured with SCellIndex i, if there is a SCell configured with the SCell index i. Otherwise, the MAC entity must ignore the Ci field. For example, the Ci field is set to "1" to indicate that the SCell with SCellIndex i should be controlled in a dormant state. The Ci field is set to "0" to indicate that the SCell with SCellIndex i should be deactivated.

For another example, the Ci field is set to "1" to indicate that the SCell with SCellIndex i should be controlled in a dormant state. The Ci field is set to "0" to indicate that the SCell with SCellIndex i should be in a state other than the dormant state. If the corresponding MAC CE is for indicating a transition between the dormant state and the active state, the terminal (MAC Entity, hereinafter, the terminal may mean a MAC entity) means that the cell in the active state (or the dormant state) is instructed to be in the dormant state (set to "1"), and the terminal transitions (maintains) to the dormant state. When the cell in the dormant state (or in the active state) receives an indication of the active state (set to “0”), the cell transitions to the active state (maintains) If the inactive cell receives the corresponding MAC CE, the UE receives the corresponding Ci field Can be ignored.

If the corresponding MAC CE is for indicating the transition between the dormant state and the inactive state, the UE transitions to the dormant state when the inactive state (or dormant state) is instructed (set to "1") when the cell in the inactive state (or dormant state) is instructed. do. In addition, when the cell in the dormant state (or inactive state) receives an inactive state (set to “0”), the terminal transitions (maintains) to the inactive state. If the cell in the active state is indicated by the corresponding MAC CE, the UE may ignore the corresponding Ci field.

As another example, the above-described MAC CE may be composed of one MAC CE, and to distinguish whether the corresponding MAC CE is for indicating a transition between the dormant state and the active state, or the transition between the dormant state and the inactive state. It may also include a 1-bit field.

Fourth embodiment: one LCID How to indicate dormant MAC CE by field

10 is a diagram illustrating a list of logical channel identifier (LCID) values for a DL-SCH according to an embodiment.

As shown in FIG. 10, in the conventional LTE technology, the LCID value consists of 5 bits. Therefore, logical channels, MAC CE, padding, etc. should be classified within 32. However, there are not many spare bits left. Therefore, it can be wasteful to use two dormant MAC CEs for 1 octet and 4 octets, or to define a new LCID for dormant/disable MAC CE or dormant/active MAC CE.

As an example for solving this problem, one LCID may be used to create a dormant MAC CE format of 1 to 4 octets or a MAC CE format for indicating activation/deactivation. That is, a dormant MAC CE format having a variable length or a MAC CE format for indicating activation/deactivation may be provided through one MAC CE format.

11 is a diagram illustrating an exemplary format of a MAC CE according to another embodiment.

Referring to FIG. 11, as an example, the corresponding MAC CE format is a CSi field of a specific number or more (eg, 6 bits or more or 7 bits or more) (or Cell State i: status information of a SCell having a serving cell index/SCellindex i) It may include a length (Len) field for indicating whether to include. The length field may be referred to as variable length indication information or a MAC CE size field (bit). The corresponding length field may be replaced with an arbitrary name having the same meaning, and may be composed of one bit, two bits, or three bits. The description is based on a case where the length field is composed of one bit, but is not limited thereto.

When the length field/bit is set to “1”, the CSi field up to another specific number (eg, serving cell index/SCellindex 7 or 15 or 23) may be included. When the length field/bit is set to “0”, the CSi field up to all SCell indexes (eg, serving cell index/SCellindex 31) may be included.

For example, when the length field/bit is set to “1”, a CSi field up to 7 or 15 or 23) of the serving cell index/SCellindex may be included. When the length field/bit is set to “0”, the CSi field up to the serving cell index/SCellindex 31 may be included.

A case where the length field/bit is composed of two bits will be described. The length field/bit can have four values of 00, 01, 10, and 11. Through this, the CSi field up to serving cell index/SCellindex 7, CSi field up to serving cell index/SCellindex 15, CSi field up to serving cell index/SCellindex 23, and CSi field up to serving cell index/SCellindex 31 are classified and indicated. can do. For example, when the length field is set to “00”, the CSi field up to serving cell index/SCellindex 7 is included, and when it is set to “01”, the CSi field up to serving cell index/SCellindex 15 is included, and “10” When set, the CSi field up to the serving cell index/SCellindex 23 may be included, and when set to “11”, the CSi field up to the serving cell index/SCellindex 31 may be included.

Hereinafter, the CSi field will be described.

For example, the state CSi field of the SCell having the serving cell index/SCellindex i may be configured as a 1-bit field when only the dormant/activated state is distinguished or only the dormant/deactivated state is distinguished.

As another example, the state CSi field of the SCell having the serving cell index/SCellindex i may be configured as a 2-bit field when the dormant/activated/deactivated state is classified. The dormant state, the active state, and the inactive state are classified through three values of 00, 01, 10, and 11 that can be configured through 2 bits, and the other value can be set as a spare/reserved bit. If the terminal receives the other value in the corresponding CSi field, the terminal may ignore the corresponding CSi field.

Meanwhile, as an example different from using the aforementioned length field/bit, an extension field may be used.

For example, as another example for providing a variable length MAC CE, an extension field indicating a flag for indicating whether more CSi fields exist in units of 1 octet or units of 2 octets may be defined. For example, if an extension field is used in the start bit of every octet or the last bit of every octet or a reserved bit in an octet, it can be included in the bit next to the Reserved bit.

For example, if an extended field indicating a flag for indicating whether more CSi fields exist in units of 1 octet is set to “1”, CSi fields included in at least one octet may be included. If the CSi field is composed of 1 bit, up to 7 CSi fields may be included. If the CSi field is composed of 2 bits, up to 3 CSi fields may be included. If this extended field is set to “0”, it indicates that one MAC SDU or padding is started in the next byte.

For example, if an extended field indicating a flag for indicating whether more CSi fields exist in units of 2 octets is set to "1", CSi fields included in at least 2 octets may be included. If the CSi field is composed of 1 bit, up to 15 CSi fields may be included. If the CSi field is composed of 2 bits, up to 7 CSi fields may be included. If this extended field is set to “0”, it indicates that one MAC SDU or padding is started in the next byte.

Meanwhile, as another example, information for distinguishing between MAC CE for 1 octet and MAC CE for 4 octets may be included in the subheader of the corresponding MAC CE. As another example, information for indicating the number of octets of the corresponding MAC CE may be included in the subheader of the corresponding MAC CE through an octet number or length field.

Information for distinguishing and indicating whether the remaining state is an active state or an inactive state according to the R field may be included by using the R field (or a specific field) on the MAC CE indicating the dormant state. For example, in the case of a dormant MAC CE, the Ci field indicates the dormant state of the SCell configured with SCellIndex i, if there is an SCell configured with SCell index i. Otherwise, the MAC entity must ignore the Ci field. For example, the Ci field is set to "1" to indicate that the SCell with SCellIndex i should be controlled in a dormant state. When the R field is set to 0, the Ci field is set to "0" to indicate that the SCell with SCellIndex i should be deactivated. When the R field is set to 1, the Ci field is set to "0" to indicate that the SCell with SCellIndex i should be activated. For another example, the Ci field is set to "1" to indicate that the SCell with SCellIndex i should be controlled in a dormant state. When the R field is set to 0, the Ci field is set to "0" to indicate that the SCell with SCellIndex i should be activated. When the R field is set to "1", the Ci field is set to "0" to indicate that the SCell with SCellIndex i should be deactivated. Although indicated as an R field for convenience of explanation, as described above, processing by designating an arbitrary field included in the MAC CE is also included in the scope of the present disclosure.

Example 5: LCID How to distinguish MAC CE indicating dormant state by increasing the field value to 6 bits

12 is a diagram illustrating a format of a MAC PDU including a MAC header and a MAC payload according to an embodiment. 13 is a diagram illustrating an exemplary MAC sub-header format.

Referring to FIG. 12, the existing 5-bit LTE LCID field value may be increased to 6 bits. In this case, the MAC subheader values are all increased to 6 bits, and thus, the byte-aligned MAC subheader is severely affected.

Specifically, referring to the MAC subheader format of FIG. 13, when the LCID increases from 5 bits to 6 bits, 1 byte may be required more. That is, the LCID is increased by 1 bit, but the MAC subheader must be increased by 1 byte. As an example for preventing such inefficiency, the R field included in the MAC subheader format may be combined with the LCID field to configure the LCID with a 6-bit LCID.

As another example, 1 bit on an arbitrary field included in the MAC subheader format may be combined with a bit in the LCID field to form an LCID with a 6-bit LCID.

In the above, an embodiment in which the base station instructs the terminal to sleep for the secondary cell through various formats and utilization of the MAC CE has been described. Each of the embodiments may be performed in combination with some or all, and may be applied individually.

Hereinafter, when the terminal receives the MAC CE indicating the dormant state, the operation of the terminal will be described focusing on the timing.

14 is a view for explaining timing according to reception of each of the activation state, the dormant state, and the deactivation state indication information for a secondary cell according to an embodiment.

With reference to FIG. 14, an operation performed by the UE when a MAC CE including SCell state indication information indicating each state is received will be described in terms of timing.

For example, upon receiving the MAC CE indicating the dormant state, the UE receives the MAC CE message from the time (n) to the time n+8 (or after the time n+8 or the initial cycle after the time n+8) E) CSI reporting can be performed. Alternatively, the terminal may start or restart the related timer.

For another example, upon receiving the MAC CE indicating the dormant state, the UE periodically reports CSI from the time point n+8 and before the time n+24 or n+34 from the time point (n) when the MAC CE message is received. You can start practicing. Alternatively, the terminal may start or restart the related timer.

For another example, upon receiving the MAC CE indicating the dormant state, the UE may start to perform periodic CSI reporting from the time point n when the MAC CE message is received (n) before the time point n+24 or n+34. Alternatively, the terminal may start or restart the related timer.

For another example, upon receiving an RRC connection reconfiguration message including information indicating the dormant state, the terminal receives the RRC connection reconfiguration message or the time when the RRC connection reconfiguration message is processed and decoded, or the RRC connection reconfiguration complete message It is possible to start performing periodic CSI reporting at a time n+8 from the time of transmission of. Alternatively, the terminal may start or restart the related timer.

For another example, when receiving an RRC connection reconfiguration message including information indicating a dormant state, the terminal performs periodic CSI reporting from the time point when the RRC connection reconfiguration message is received and before the time n+24 or n+34. You can start. Alternatively, the terminal may start or restart the related timer.

For another example, upon receiving an RRC connection reconfiguration message including information indicating a dormant state, the terminal may start performing periodic CSI reporting at a time n+8 from the time when decoding for the RRC connection reconfiguration message is completed. Alternatively, the terminal may start or restart the related timer.

For another example, upon receiving the RRC connection reconfiguration message including information indicating the dormant state, the terminal may start performing periodic CSI reporting at the time when the RRC connection reconfiguration complete message is transmitted. Alternatively, the terminal may start or restart the related timer.

For another example, when receiving an RRC connection reconfiguration message including information indicating the dormant state, the terminal is instructed by the base station (included in the RRC connection reconfiguration message) based on the time at which the RRC connection reconfiguration complete message is transmitted. Periodic CSI reporting can be started when the offset parameter is applied. Alternatively, the terminal may start or restart the related timer.

For another example, upon receiving an RRC connection reconfiguration message including information indicating the dormant state, the terminal may start performing CSI reporting in the first cycle of periodic CSI reporting at the time when the RRC connection reconfiguration complete message is transmitted. . Alternatively, the terminal may start or restart the related timer.

For another example, upon receiving the RRC connection reconfiguration message including information indicating the dormant state, the terminal may start performing periodic CSI reporting as early as possible from the time when the RRC connection reconfiguration complete message is transmitted. Alternatively, the terminal may start or restart the related timer. In this case, the earliest possible time should be within n+24 or n+34 from the time when the RRC connection reconfiguration message is received or the time when the RRC reconfiguration message is decoded.

As described above, when the SCell state indication information indicating the dormant state is received, the UE transmits the channel state information to the base station at a specific time point.

Hereinafter, after receiving information indicating the activation state for the SCell through the activation/deactivation MAC CE, a method for fast data transmission through the corresponding SCell by the UE by reducing the initial effective CQI estimation and reporting time will be described.

The SCell activation delay is caused by causes such as CQI computation delay (4~6ms), time to wait for valid resources for CSI measurement report, and time for RF re-tuning.

The terminal may perform CSI reporting when n+8 is reached after the time (n) when the activation command is received. Therefore, if the UE can notify the network that the SCell is ready to use the activated SCell by transmitting the uplink signal in a short period, the delay for transmitting data by activating the SCell can be reduced.

When uplink resources are allowed/allocated in the corresponding SCell, the UE transmits CQI reporting to the base station in a short period.

When receiving the SCell activation command, the base station may instruct the terminal to use the short-period CQI reporting resource.

To this end, the UE may be configured with CQI resources specific to the SCell. Alternatively, the terminal may be configured with a specific CQI resource for the corresponding SCell in the PCell. Alternatively, the UE may be configured with a specific CQI resource for the corresponding SCell in the PUCCH SCell. The base station may include information on a specific CQI resource in the RRC connection reconfiguration message to indicate to the terminal.

Upon receiving the SCell activation command, the UE reports a CQI report to indicate that the SCell is activated (for convenience of explanation, but is indicated by CQI reporting, channel quality indicator (CQI)/Precoding Matrix Indicator (PMI))/Rank Indicator (RI)/PTI (Procedure Transaction Identifier)/CRI (CSI-RS Resource Indicator) report is also included in this embodiment) can be transmitted through a PCell or another SCell or PUCCH SCell. Alternatively, the terminal may report through the SCell indicated as the active state.

In order to avoid the load on the PUCCH resource, the short period of the CQI reporting resource should be available only when the SCell activation command is received. However, if the UE transmits the CQI reporting through the PUCCH, when the SCell activation command is received, the PUCCH resource is continuously used, thereby causing a load.

To solve this, the terminal needs to switch/fallback/switch in a normal period (or a period set longer than the short period for indicating/information of the above-described SCell activation to the base station).

As an example for this, when the UE receives a SCell activation command (when receiving a MAC CE indicating SCell activation), a CQI configuration having a short CQI reporting period (for valid CQI reporting) and a normal period in the activated state ( Alternatively, a CQI configuration having a CQI reporting period of (a longer period than a short period for indicating/information of the above-described SCell activation to the base station) may be configured in the terminal through an RRC connection reconfiguration message. That is, as described above, the base station may configure the terminal by classifying a CQI report period parameter for transmitting channel state information in an active state and a CQI report period parameter for transmitting channel state information in a dormant state.

As another example for this, when the UE receives the MAC CE indicating SCell activation, the CQI configuration having a short CQI reporting period (for valid CQI reporting) is a CQI reporting start offset for the corresponding CQI reporting, and the corresponding CQI reporting period (e.g. For example, 1 ms) and information for indicating the number of repetitions of the corresponding CQI reporting may be included. The CQI reporting period may be pre-configured with a specific value for a terminal capable of the corresponding function. For example, if CQI reporting is transmitted as many times as the number of repetitions of CQI reporting, the terminal switches to the CQI reporting period of a normal period (or a period longer than the short period for indicating/information of the aforementioned SCell activation to the base station) in the activated state. /fallback/ can be switched.

As another example for this, when the UE receives the MAC CE indicating SCell activation, the UE reports the CQI through a short CQI reporting period. If the terminal receives resource allocation (ex, downlink allocation, uplink grant) for the corresponding SCell from the base station, the terminal can switch/fallback/switch to the CQI reporting period of the normal period in the activated state.

As another example for this, when the UE receives the MAC CE indicating SCell activation, the UE reports the CQI through a short CQI reporting period. If a specific subframe is exceeded in the subframe receiving the MAC CE, the UE may switch/fallback/switch to the CQI reporting period of the normal period in the activated state. The specific subframe may be 24 or 34 subframes to which the SCell activation operation is applied after receiving the SCell activation indication. Alternatively, the corresponding subframe may be configured by the base station in the terminal or pre-configured with a specific value for a terminal capable of corresponding function.

As another example for this, when the UE receives the MAC CE indicating SCell activation, the UE reports the CQI through a short CQI reporting period. The UE may switch/fallback/switch to the CQI reporting period of the normal period while being activated at a time corresponding to the minimum value/time of the above-described operation/method/time.

As described above, the terminal configures a period parameter for CQI reporting in a dormant state, which is separated from a period parameter for CQI reporting in an active state, and may transmit a CQI report according to the configuration and the state of the secondary cell. In addition, the CQI reporting period may be changed according to the above-described method.

As described above, the present disclosure provides an effect that the terminal can quickly perform user data transmission by activating the SCell. Accordingly, the present disclosure provides an effect of increasing the offloading effect by reducing the SCell activation delay in the dormant state and enabling data transmission through the SCell to be quickly performed.

Hereinafter, configurations of a terminal and a base station capable of performing some or all of the above-described embodiments will be described once again with reference to the drawings.

15 is a diagram illustrating a configuration of a terminal according to an embodiment.

Referring to FIG. 15, the terminal 1500 for controlling the state of the secondary cell receives SCell state indication information indicating the state of the secondary cell (SCell) from the base station through an RRC message or a MAC control element. When the reception unit 1530 and the SCell state indication information indicate the Dormant state, the control unit 1510 controls the state of the secondary cell to the dormant state, and the dormant state CQI that is set separately from the activation state CQI report period parameter. It may include a transmission unit 1520 that transmits the channel status information reporting for the secondary cell in the dormant state according to the report period parameter.

For example, the receiver 1530 may receive SCell status indication information through higher layer signaling or MAC CE. Higher layer signaling may mean an RRC message. Higher layer signaling and MAC CE may be received according to circumstances such as whether the terminal is configured with a SCell.

For example, when the receiving unit 1530 receives an RRC connection reconfiguration message for configuring the secondary cell, SCell state indication information may be included. For example, the SCell state indication information received through the RRC message may be configured with a 1-bit parameter indicating the active state or the dormant state. If configuration information for configuring the secondary cell is included through the RRC message, but the parameter for the SCell state indication information is not included in the configuration information, the controller 1510 may configure the secondary cell in an inactive state. Thereafter, the controller 1510 may control the state of the secondary cell according to the SCell state indication information received through the MAC CE.

As another example, after configuring the secondary cell, the receiver 1530 may dynamically receive state indication information for the secondary cell through the SCell state indication information by the MAC CE. For example, the MAC control element including the SCell state indication information may be configured in a format including a field for indicating the state of the secondary cell as an active state or a dormant state for each secondary cell index. Alternatively, the MAC control element including the SCell state indication information may be configured in a format including a field for indicating the state of the secondary cell as an active state or an inactive state for each secondary cell index.

In other words, the MAC control element includes a first MAC control element configured to indicate a state for each secondary cell index as an active state or an inactive state, and a second MAC control element configured to indicate a state for each secondary cell index as a dormant state or an active state. It can be classified as In this case, the first MAC control element and the second MAC control element are identified by MAC PDU subheaders having different LCIDs (Logical Channel ID).

Also, the controller 1510 checks whether the SCell status indication information is included in the RRC message or the MAC CE, and controls the state of the secondary cell according to the SCell status indication information. For example, when the SCell state indication information indicates a dormant state, the controller 1510 may configure the state of the secondary cell as a dormant state, or control a state transition operation to be performed in the dormant state.

For example, when the RRC message for configuring the secondary cell in the terminal is received, and the SCell status indication information is included in the RRC message, the controller 1510 may configure the secondary cell in a state indicated by the SCell status indication information. That is, when configuring the secondary cell in the terminal, the controller 1510 may configure the secondary cell in an active state or a dormant state according to the SCell state indication information. If the SCell state indication information is not included in the RRC message for configuring the secondary cell, the controller 1510 may configure the secondary cell in an inactive state.

As another example, the receiver 1530 may receive a MAC CE indicating a state of the configured secondary cell. For example, the MAC control element including the SCell state indication information may include a field for indicating the state of the secondary cell as an active state or a dormant state for each secondary cell index.

Specifically, the control unit 1510 activates the state of the secondary cell if the value of the index field for the secondary cell is set to a value indicating the activation state, and the state of the secondary cell indicated by the index is a dormant state. Can transition to the state.

Alternatively, the controller 1510 may ignore the value of the index field when the value of the index field for the secondary cell is set to a value indicating the activation state and the state of the secondary cell is not a dormant state. That is, the current state of the secondary cell can be maintained.

As another example, two types of MAC CE may exist: a first MAC CE and a second MAC CE as described above. In the case of the first MAC CE, the state of the secondary cell is indicated to be activated or deactivated, and the UE may control the state of the secondary cell according to the indication information. In the case of the second MAC CE, this is to indicate the state of the secondary cell as an active or dormant state, and the terminal may control the state of the secondary cell according to the aforementioned index field value and the current state of the secondary cell.

In addition, when both the above-described first MAC CE and second MAC CE messages are received, the control unit 1510 determines the state of the secondary cell by combining the values of the secondary cell index fields indicated by the two MAC CEs. You can decide. For example, it may be determined whether the SCell state indication information indicates the dormant state according to a combination of the value of the index field for the secondary cell included in each of the MAC control element and the second control element.

For example, when the secondary cell is in a dormant state, the transmitter 1520 may report channel state information for the secondary cell. Specifically, the transmitter 1520 may report CQI/PMI/RI/PTI/CRI for the dormant secondary cell. However, the controller 1510 controls not to transmit the SRS in the dormant secondary cell. Also, the transmitter 1520 does not transmit the UL-SCH and does not transmit the RACH in the dormant secondary cell. Further, the controller 1510 does not monitor the PDCCH in the dormant secondary cell, nor does it monitor the PDCCH for the dormant secondary cell. Of course, the transmitter 1520 also does not perform PUCCH transmission in the dormant secondary cell.

Meanwhile, the transmitter 1520 may use a CQI report period parameter to report channel state information for the dormant secondary cell. For example, the transmitter 1520 reports channel state information to the base station at a period set according to the CQI report period parameter. In this case, the CQI report period parameter for transmitting the channel state information for the dormant secondary cell is distinct from the CQI report period parameter for transmitting the channel state information for the active secondary cell. That is, the receiving unit 1530 may receive the active CQI report period parameter and the dormant CQI report period parameter, respectively, and the transmitting unit 1520 may periodically transmit channel state information by applying a specific period parameter according to the state of the secondary cell. have.

In addition, the control unit 1510 controls the overall operation of the terminal 1500 according to controlling the sleep state control and channel state information transmission operation for the SCell in the CA situation required to perform the above-described embodiment. .

The transmitting unit 1520 and the receiving unit 1530 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present disclosure with the base station.

16 is a diagram illustrating a configuration of a base station according to an embodiment.

Referring to FIG. 16, the base station 1600 that controls the state of the secondary cell of the terminal transmits SCell state indication information indicating the state of the secondary cell (SCell) to the terminal through an RRC message or a MAC control element. When the secondary cell is configured in the Dormant state according to the transmitting unit 1620 and the SCell state indication information, the secondary cell in the dormant state is stored according to the dormant state CQI report period parameter set separately from the activated state CQI report period parameter. It may include a receiving unit 1630 for receiving a report on the channel state information.

For example, the transmitter 1620 may transmit SCell status indication information through higher layer signaling or MAC CE. Higher layer signaling may mean an RRC message. Higher layer signaling and MAC CE may be transmitted according to circumstances such as whether the terminal is configured with a SCell.

As an example, when the transmitter 1620 transmits an RRC connection reconfiguration message for configuring a secondary cell to a terminal, SCell state indication information may be included. For example, the SCell state indication information transmitted through the RRC message may be configured with a 1-bit parameter indicating the active state or the dormant state. If the configuration information for configuring the secondary cell is included through the RRC message, but the parameter for the SCell state indication information is not included in the configuration information, the UE may configure the secondary cell in an inactive state. Thereafter, the base station 1600 may control the state of the secondary cell of the terminal according to the SCell state indication information transmitted through the MAC CE.

As another example, the transmitter 1620 may dynamically transmit the SCell state indication information by the MAC CE after the terminal configures the secondary cell. For example, the MAC control element including the SCell state indication information may be configured in a format including a field for indicating the state of the secondary cell as an active state or a dormant state for each secondary cell index. Alternatively, the MAC control element including the SCell state indication information may be configured in a format including a field for indicating the state of the secondary cell as an active state or an inactive state for each secondary cell index.

In other words, the MAC control element includes a first MAC control element configured to indicate a state for each secondary cell index as an active state or an inactive state, and a second MAC control element configured to indicate a state for each secondary cell index as a dormant state or an active state. It can be classified as In this case, the first MAC control element and the second MAC control element are identified by MAC PDU subheaders having different LCIDs (Logical Channel ID).

Meanwhile, when the secondary cell of the terminal is in a dormant state, the receiver 1530 may receive channel state information for the secondary cell. Specifically, the receiver 1530 may receive CQI/PMI/RI/PTI/CRI for the dormant secondary cell. However, as described above, the receiving unit 1530 does not receive the SRS in the dormant secondary cell. Also, the receiver 1530 does not receive the UL-SCH in the dormant secondary cell and does not receive the RACH. In addition, the transmitter 1520 does not transmit the PDCCH in the dormant secondary cell and does not transmit the PDCCH for the dormant secondary cell. Of course, the control unit 1510 does not perform an operation for receiving a PUCCH in the dormant secondary cell.

The transmitter 1520 may transmit a CQI report period parameter to report channel state information for the dormant secondary cell. For example, the receiving unit 1530 receives channel state information from the terminal at a period set according to the CQI report period parameter. In this case, the CQI report period parameter for transmitting the channel state information for the dormant secondary cell is distinct from the CQI report period parameter for transmitting the channel state information for the active secondary cell. That is, the transmission unit 1520 transmits the active state CQI report period parameter and the dormant state CQI report period parameter, respectively, and the receiving unit 1530 periodically receives channel state information by applying a specific period parameter according to the state of the secondary cell. I can.

In addition, the controller 1610 controls the overall operation of the base station 1600 according to controlling the sleep state control for the SCell and the operation of receiving channel state information in the CA situation required to perform the above-described embodiment. .

The transmission unit 1620 and the reception unit 1630 are used to transmit and receive signals, messages, and data necessary for carrying out the above-described present disclosure with the terminal.

The above-described embodiments may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP and 3GPP2 wireless access systems. That is, steps, configurations, and parts not described in order to clearly reveal the present technical idea among the embodiments may be supported by the aforementioned standard documents. In addition, all terms disclosed in the present specification can be described by the standard documents disclosed above.

The above-described embodiments can be implemented through various means. For example, the present embodiments may be implemented by hardware, firmware, software, or a combination thereof.

In the case of implementation by hardware, the method according to the embodiments includes one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), and FPGAs. (Field Programmable Gate Arrays), can be implemented by a processor, a controller, a microcontroller, a microprocessor.

In the case of implementation by firmware or software, the method according to the embodiments may be implemented in the form of an apparatus, procedure, or function that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor through various known means.

In addition, terms such as "system", "processor", "controller", "component", "module", "interface", "model", and "unit" described above are generally used for computer-related entity hardware, hardware and software. It can mean a combination, software, or running software. For example, the above-described components may be, but are not limited to, a process driven by a processor, a processor, a controller, a control processor, an object, an execution thread, a program, and/or a computer. For example, components can be both a controller or processor and an application running on a controller or processor. One or more components can reside within a process and/or thread of execution, and components can reside on one machine or be deployed on more than one machine.

The description above and the accompanying drawings are merely illustrative of the spirit of the present technology, and those of ordinary skill in the art can combine, separate, replace, and configure configurations within the range not departing from the essential characteristics of the present technology. Various modifications and variations such as changes will be possible. Accordingly, the embodiments disclosed in the present specification are not intended to limit the present technical idea, but to describe it, and the scope of the present technical idea is not limited by these embodiments. The scope of protection of the present technical idea should be interpreted by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present specification.

Claims (24)

In the method for the terminal to control the state of the secondary cell,
A receiving step of receiving SCell state indication information indicating a state of a secondary cell (SCell) from a base station through an RRC message or a MAC control element;
A control step of controlling a state of the secondary cell to the dormant state when the SCell state indication information indicates a Dormant state; And
A transmitting step of transmitting a channel state information report for the dormant secondary cell according to the dormant CQI report period parameter set separately from the active CQI report period parameter,
The MAC control element including the SCell state indication information,
It is configured in a format including a field for indicating a state of the secondary cell as an active state or the dormant state for each secondary cell index,
The control step,
And disregarding the value of the index field when the value of the index field for the secondary cell is set to a value indicating the activation state, and the state of the secondary cell is not the dormant state. The method of claim 1,
The SCell state indication information received through the RRC message,
And a 1-bit parameter indicating an active state or the dormant state. The method of claim 2,
The control step,
When the RRC message does not include the SCell state indication information, the secondary cell is configured in an inactive state, and the state of the secondary cell is changed to the dormant state according to the MAC control element. delete The method of claim 1,
The control step,
When a value of the index field for the secondary cell is set to a value indicating the activation state, and when the state of the secondary cell is the dormant state, the state of the secondary cell is transitioned to the activated state. delete The method of claim 1,
The MAC control element,
A first MAC control element configured to indicate the state of each secondary cell index as an active state or an inactive state, and
It is divided into a second MAC control element configured to indicate a state for each secondary cell index as the dormant state or the active state,
The first MAC control element and the second MAC control element are identified by MAC PDU subheaders having different logical channel IDs (LCIDs). The method of claim 7,
The control step,
When both the first MAC control element and the second MAC control element are received,
And determining whether the SCell state indication information indicates the dormant state according to a combination of a value of an index field for the secondary cell included in each of the first MAC control element and the second MAC control element. In the method for the base station to control the state of the secondary cell of the terminal,
A transmitting step of transmitting SCell state indication information indicating a state of a secondary cell (SCell) to a terminal through an RRC message or a MAC control element; And
When the secondary cell is configured in the Dormant state according to the SCell state indication information, the channel state of the secondary cell in the dormant state according to the dormant state CQI report period parameter set separately from the activation state CQI report period parameter Including a receiving step of receiving the information reporting,
The MAC control element,
It is configured in a format including a field for indicating a state of the secondary cell as an active state or the dormant state for each secondary cell index,
The terminal,
And disregarding the value of the index field when the value of the index field for the secondary cell is set to a value indicating the activation state, and the state of the secondary cell is not the dormant state. The method of claim 9,
The RRC message,
Includes secondary cell configuration information for configuring the secondary cell in the terminal,
The SCell status indication information,
And a 1-bit parameter indicating an active state or the dormant state. delete The method of claim 9,
The MAC control element,
A first MAC control element configured to indicate the state of each secondary cell index as an active state or an inactive state, and
It is divided into a second MAC control element configured to indicate a state for each secondary cell index as the dormant state or the active state,
The first MAC control element and the second MAC control element are identified by MAC PDU subheaders having different logical channel IDs (LCIDs). In the terminal controlling the state of the secondary cell,
A receiver for receiving SCell status indication information indicating a status of a secondary cell (SCell) from a base station through an RRC message or a MAC control element;
A control unit controlling a state of the secondary cell to the dormant state when the SCell state indication information indicates a Dormant state; And
In accordance with the dormant CQI report period parameter set separately from the activated state CQI report period parameter, the method includes a transmitter for transmitting channel state information reporting on the dormant secondary cell,
The MAC control element including the SCell state indication information,
It is configured in a format including a field for indicating a state of the secondary cell as an active state or the dormant state for each secondary cell index,
The control unit,
The terminal disregarding the value of the index field when the value of the index field for the secondary cell is set to a value indicating the activation state and the state of the secondary cell is not the dormant state. The method of claim 13,
The SCell state indication information received through the RRC message,
Terminal, characterized in that configured with a 1-bit parameter indicating an active state or the dormant state. The method of claim 14,
The control unit,
When the RRC message does not include the SCell state indication information, the secondary cell is configured in an inactive state, and the state of the secondary cell is changed to the dormant state according to the MAC control element. delete The method of claim 13,
The control unit,
A terminal, characterized in that when a value of the index field for the secondary cell is set to a value indicating the activation state, and when the state of the secondary cell is the dormant state, the state of the secondary cell is transitioned to the activated state. delete The method of claim 13,
The MAC control element,
A first MAC control element configured to indicate the state of each secondary cell index as an active state or an inactive state, and
It is divided into a second MAC control element configured to indicate a state for each secondary cell index as the dormant state or the active state,
Wherein the first MAC control element and the second MAC control element are identified by MAC PDU subheaders having different logical channel IDs (LCIDs). The method of claim 19,
The control unit,
When both the first MAC control element and the second MAC control element are received,
And determining whether the SCell state indication information indicates the dormant state according to a combination of values of an index field for the secondary cell included in each of the first MAC control element and the second MAC control element. In the base station for controlling the state of the secondary cell of the terminal,
A transmitter for transmitting SCell state indication information indicating a state of a secondary cell (SCell) to the terminal through an RRC message or a MAC control element; And
When the secondary cell is configured in the Dormant state according to the SCell state indication information, the channel state of the secondary cell in the dormant state according to the dormant state CQI report period parameter set separately from the activation state CQI report period parameter Including a receiving unit for receiving information reporting,
The MAC control element,
It is configured in a format including a field for indicating a state of the secondary cell as an active state or the dormant state for each secondary cell index,
The terminal,
And when a value of the index field for the secondary cell is set to a value indicating the activation state, and the value of the index field is ignored when the state of the secondary cell is not the dormant state. The method of claim 21,
The RRC message,
Includes secondary cell configuration information for configuring the secondary cell in the terminal,
The SCell status indication information,
The base station, characterized in that consisting of a 1-bit parameter indicating the active state or the dormant state. delete The method of claim 21,
The MAC control element,
A first MAC control element configured to indicate the state of each secondary cell index as an active state or an inactive state, and
It is divided into a second MAC control element configured to indicate a state for each secondary cell index as the dormant state or the active state,
The first MAC control element and the second MAC control element are identified by MAC PDU subheaders having different LCIDs (Logical Channel ID).

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