KR102230567B1 - Method for Transmitting and Receiving Control Information, Base Station, and User Equipment - Google Patents

Abstract

The present invention relates to a method and apparatus for transmitting and receiving control information between base stations when a base station instructs activation or deactivation of a carrier in a wireless communication system in which a terminal operates by receiving resources from two or more different base stations. When the base station determines the activation or deactivation of the carrier for the terminal, the base station transmits information on the time at which activation or deactivation of the carrier is performed to another base station that provides resources to the terminal.

Description

Control information transmission/reception method, base station, and terminal {Method for Transmitting and Receiving Control Information, Base Station, and User Equipment}

The present invention relates to a method and apparatus for transmitting and receiving control information between base stations or between a base station and a terminal in a wireless communication system, and more particularly, one base station in a wireless communication system in which a terminal operates by receiving resources from two or more different base stations. The present invention relates to a method and apparatus for transmitting and receiving control information between base stations or between a base station and a terminal when activation/deactivation of this carrier is performed.

As communication systems evolve, consumers such as businesses and individuals have come to use a wide variety of wireless terminals. Mobile communication systems such as LTE (Long Term Evolution) and LTE-Advanced of the current 3GPP series are high-speed and large-capacity communication systems that can transmit and receive various data such as video and wireless data, out of voice-oriented services. There is a need to develop a technology capable of transmitting large-capacity data equivalent to When performing carrier activation/deactivation in a plurality of cells or small cell environments under consideration for this, a glitch problem that did not occur in the conventional single cell method may occur.

An object of the present invention is to provide a method and apparatus for solving a glitch problem in a small cell environment.

An embodiment of the present invention is a method for transmitting control information of a base station in a communication system in which a terminal operates by receiving resources from at least two base stations using a plurality of carriers, the time at which activation or deactivation of a specific carrier is performed in the terminal Transmitting the information on the terminal to another base station that provides resources to the terminal; And transmitting information indicating activation or deactivation of the specific carrier to the terminal.

Another embodiment of the present invention is a method for transmitting control information of a base station in a communication system in which a terminal operates by receiving resources from at least two base stations using a plurality of carriers, and activation or deactivation of a specific carrier after receiving a message from the terminal Transmitting time information at which is performed and information indicating activation or deactivation of the specific carrier to the terminal; And transmitting information about a time when activation or deactivation of the specific carrier is performed in the terminal to another base station providing resources to the terminal.

Another embodiment of the present invention is a method for receiving control information of a base station in a communication system in which a terminal operates by receiving resources from at least two base stations using a plurality of carriers, the time at which activation or deactivation of a specific carrier is performed in the terminal. Receiving information on information from another base station providing resources to the terminal; And setting a time at which downlink or uplink scheduling is not transmitted to the terminal based on information on a time at which activation or deactivation of a specific carrier is performed in the terminal. .

Another embodiment of the present invention is a method for receiving control information of a terminal in a communication system in which a terminal operates by receiving resources from at least two base stations using a plurality of carriers, wherein activation or deactivation of a specific carrier is performed after receiving a message. Receiving time information and information indicating activation or deactivation of the specific carrier from a base station; And performing activation or deactivation of the specific carrier after receiving information instructing activation or deactivation of the specific carrier and time according to the time information has elapsed.

In another embodiment of the present invention, as a base station in a communication system in which a terminal operates by receiving resources from at least two base stations using a plurality of carriers, the terminal provides information on a time when activation or deactivation of a specific carrier is performed. A base station communication unit for transmitting to another base station providing resources to the terminal; And a terminal communication unit for transmitting information indicating activation or deactivation of the specific carrier to the terminal.

In another embodiment of the present invention, as a base station in a communication system in which a terminal operates by receiving resources from at least two base stations using a plurality of carriers, time information at which activation or deactivation of a specific carrier is performed after receiving a message from the terminal And a terminal communication unit for transmitting information instructing activation or deactivation of the specific carrier to the terminal. And it provides a base station comprising a base station communication unit for transmitting information on the time when the activation or deactivation of the specific carrier is performed in the terminal to another base station providing resources to the terminal.

In another embodiment of the present invention, as a base station in a communication system in which a terminal operates by receiving resources from at least two base stations using a plurality of carriers, the terminal provides information on a time when activation or deactivation of a specific carrier is performed. A base station communication unit receiving from another base station providing resources to the terminal; And a control unit configured to set a time during which downlink or uplink scheduling is not transmitted to the terminal based on information on a time when activation or deactivation of a specific carrier is performed in the terminal.

Another embodiment of the present invention is a terminal in a communication system in which a terminal operates by receiving a resource from at least two base stations using a plurality of carriers, and information on the time at which activation or deactivation of a specific carrier is performed after receiving a message, and the specific A receiving unit for receiving information indicating activation or deactivation of a carrier from a base station; And a control unit for receiving information indicating activation or deactivation of the specific carrier and performing activation or deactivation of the specific carrier after time according to the time information has elapsed.

According to the present invention described above, a glitch problem can be solved in a small cell environment.

1 is a diagram illustrating dual connectivity in a small cell scenario.
2 is a diagram showing a structure of a user plane in a dual connection.
3 is a diagram illustrating a change in an RF chain when the number of carriers on which communication is performed is changed.
4 is a flowchart illustrating a method of informing whether a carrier can be activated/deactivated by transmitting UE capability in an embodiment of the present invention.
FIG. 5 is a flowchart illustrating a first example of a method of transferring information about active/inactive time of a carrier between base stations in another embodiment of the present invention.
6 is a flowchart illustrating a method of transmitting control information by a first base station in the example of FIG. 5.
7 is a flowchart illustrating a method of receiving control information of a second base station in the example of FIG. 5.
FIG. 8 is a flowchart illustrating a second example of a method of transferring carrier activation/inactivity time information between base stations in another embodiment of the present invention.
9 is a flowchart illustrating a method of transmitting control information by a first base station in the example of FIG. 8.
10 is a flowchart illustrating a method of receiving control information of a second base station in the example of FIG. 8.
11 is a flowchart illustrating a method of performing carrier activation/deactivation of a terminal in the example of FIG. 8.
12 is a flowchart illustrating a third example of a method of transmitting active/inactive time information of a carrier between base stations in another embodiment of the present invention.
13 is a flowchart illustrating a method of transmitting control information by a first base station in the example of FIG. 12.
14 is a flowchart illustrating a method of performing carrier activation/deactivation of a terminal in the example of FIG. 12.
15 is a block diagram showing a configuration of a base station according to an embodiment of the present invention.
16 is a block diagram showing a configuration of a terminal according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention 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, when 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.

The wireless communication system is a UE (User Equipment, UE) and uplink communication with the UE (e.g., PUSCH (Physical Uplink Shared CHannel), PUCCH (Physical Uplink Control CHannel), PRACH (Physical Random Access CHannel), etc.) and downlink Link communication (e.g., PDSCH (Physical Downlink Shared CHannel), PDCCH (Physical Downlink Control CHannel), EPDCCH (Enhanced Physical Downlink Control CHannel)), PHICH (Physical HARQ Information CHannel), PCFICH (Physical Control Format Information CHannel), PBCH It includes a base station (BS) that performs (Physical Broadcast CHannel), etc.

In this specification, a terminal is a comprehensive concept that means a terminal in wireless communication, as well as UE (User Equipment) in WCDMA, LTE, HSPA, etc., as well as MS (Mobile Station), UT (User Terminal), and SS ( It should be interpreted as a concept that includes all subscriber stations and wireless devices.

A base station is generally a station that communicates with a terminal, and is a Node-B (Node-B, NB), eNodeB (evolved Node-B, eNB), a sector, a site, and a BTS (Base Transceiver System). ), access point, relay node, and the like.

In addition, the base station is meant to encompass a variety of coverage areas such as a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, a small cell, a radio resource head (RRH), and a communication range of a relay node.

Since the various cells listed above have a base station controlling each cell, the base station can be interpreted in two meanings. i) In relation to the radio region, it may be a device that provides a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, or a small cell, or ii) the radio region itself may be indicated. In i), all the devices that are controlled by the same entity that provide a predetermined wireless area are controlled by the same entity, or all the devices that interact to form the wireless area are instructed to the base station. The eNB, RRH, antenna, RU, LPN, point, transmission/reception point, transmission point, reception point, etc., according to the configuration method of the radio area, are an embodiment of the base station. In ii), the radio region itself to receive or transmit signals from the viewpoint of the user terminal or the viewpoint of a neighboring base station may be indicated to the base station.

Therefore, megacell, macrocell, microcell, picocell, femto cell, small cell, RRH, antenna, RU, LPN (Low Power Node), point, eNB, transmission/reception point, transmission point, and reception point are collectively referred to as a base station. Refers to.

In addition, the base station may be referred to as a transmission point (TP) in terms of transmitting downlink communication to the terminal, and may be referred to as a reception point (RP) in terms of receiving uplink communication from the terminal, or It may be referred to as a point or a transmission and reception point.

In the present specification, a cell having a relatively wide coverage based on the coverage of a cell provided by a base station is described as a macro cell, and a relatively narrow coverage is described as a small cell.

The small cell may be formed to overlap with the macro cell coverage, or may be formed not to overlap with the macro cell coverage.

A system in which a small cell is formed can provide a dual connectivity operation to a terminal. Dual access may mean an operation in which the UE receives and uses resources from at least two different base stations connected through a non-ideal backhaul.

1 is a diagram illustrating an example of dual access in a small cell scenario.

In a dual access situation, the base station may include a Master eNB (MeNB) 110 and a Secondary eNB (SeNB) 120. The MeNB 110 may refer to a base station operating as a mobility anchor by maintaining at least an S1-MME interface with a CN (Core Node) in a dual access situation. The MeNB 110 may be a macro cell or one of a plurality of small cells. The SeNB 120 may refer to a base station that provides additional resources without being the MeNB 110 in a dual access situation. The MeNB 110 and the SeNB 120 may communicate through an Xn interface.

In FIG. 1, the terminal 130 may receive services from different base stations 110 and 120 and receive different data from each of the base stations 110 and 120.

In order to perform the dual access service, each of the base stations 110 and 120 may prepare one or more serving cells at different frequencies and set them to the terminal 130. Serving cells corresponding to the MeNB 110 may be referred to as a Master Cell Group (MCG), and serving cells corresponding to the SeNB 120 may be referred to as a Secondary Cell Group (SCG).

In order to perform the service as shown in FIG. 1, two user plane (UP) structures of FIG. 2 may be possible.

Referring to FIG. 2(a), in the case of UP 1A, the MeNB 110 and the SeNB 120 are each separate Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and Medium Access Control (MAC). You can have a hierarchy.

Referring to FIG. 2(b), in the case of UP 3C, some of the resource bearers (RBs) serviced to the terminal are serviced only by the MeNB 110, and other parts of the RB are MeNB 110 and SeNB ( 120) can be serviced at the same time. This shape can be called a multi-flow or a bearer split. The RB performing multi-flow has a PDCP layer in the MeNB 110 and may have a separate shape on the RLC layer. That is, the PDCP Service Data Unit (SDU) becomes a PDCP Packet Data Unit (PDU), and may be distributed and delivered to the RLC layers of the MeNB 110 and SeNB 120. The RLC layer of the SeNB 120 may form an RLC SDU with PDCP PDUs distributed and transmitted through the Xn interface from the PDCP layer of the MeNB 110 to perform radio link control according to the mode.

In FIG. 2, an Xn interface may be defined between the MeNB 110 and the SeNB 120, and the Xn interface may be equipped with various technologies such as fiber, DSL (Digital Subscriber Line), cable, and wireless backhaul. . Tables 1 and 2 below show examples of backhaul performance of the Xn interface according to each technology.

Table 1 shows an example of a non-ideal backhaul, and Table 2 shows an example of an ideal backhaul. In Tables 1 and 2, "Latency (One way)" represents a one-way delay time, and "Throughput" represents a throughput per unit time.

Meanwhile, when a terminal performs communication using a plurality of carriers, when the number of carriers on which communication is performed changes, a situation in which communication cannot be temporarily performed due to a change in the radio frequency (RF) configuration of the terminal. Problems can arise, and this can be called a glitch problem. In particular, when performing communication through a plurality of carriers in one RF band, it may be necessary to change the shaping of the RF, and while such a change is performed, transmission and reception of the terminal may become impossible. After the RF shaping is completed, normal transmission/reception may be possible.

As an example of a situation in which such a problem occurs, there may be a situation in which a carrier is set or canceled (configuration/deconfiguration). When the carrier is set, it means that the carrier is set to be usable, and that the carrier is canceled means that the carrier set to be usable is set to be unavailable.

Another example of a situation in which such a problem occurs may be a situation in which a carrier is activated or deactivated (activation/deactivation). Deactivation means that the carrier is in a state in which RF is turned off for the corresponding carrier in order to reduce power consumption of the terminal according to the presence or absence of activated data transmission even though the carrier is configured. That is, although the terminal has configuration information for the corresponding carrier, since the RF is off, communication through the corresponding carrier is impossible. Activation means making the deactivated carrier available for communication again. That is, it means that the RF is turned on from the off state for the corresponding carrier to enable communication. Since the terminal has configuration information for the corresponding carrier, fast communication recovery is possible.

3 is a diagram illustrating a change in an RF chain when the number of carriers on which communication is performed is changed.

In the example of FIG. 3, two carriers 310 and 320 are set in a specific RF band. The two carriers 310 and 320 may be contiguous or non-contiguous in frequency. In this case, the terminal may use one RF chain.

When both carriers 310 and 320 are activated, the terminal can use an RF chain using a band pass filter 330 having a bandwidth covering the frequencies of the two carriers 310 and 320. have. On the other hand, when one of the two carriers 310 and 320 is deactivated, the terminal uses an RF chain using a band filter 340 having a bandwidth covering the frequency of one carrier 320. I can.

As can be seen in FIG. 3, in the case of a terminal performing communication using a plurality of carriers, RF shaping may be changed when the carrier is activated/deactivated, and the terminal cannot communicate while the RF shaping is changed. Can be in a state. Similarly, RF shaping may be changed when a carrier is set/terminated, and the UE may be in a state in which communication cannot be performed while the RF shaping is changed.

The base station can transmit information indicating the setting/cancellation of the carrier or activation/deactivation of the carrier to the terminal, so the base station can know when the terminal becomes unable to communicate due to RF shaping change, and the base station can When communication is not possible, operations such as downlink scheduling assignment and uplink scheduling approval will not be performed.

Meanwhile, the two carriers 310 and 320 of FIG. 3 may be carriers related to different base stations, respectively. For example, the carrier 310 may be a carrier included in the MCG related to the MeNB, and the carrier 320 may be a carrier included in the SCG related to the SeNB. When the carriers 310 and 320 are activated and the MeNB transmits information indicating deactivation of the carrier 310 to the terminal, the MeNB knows that the terminal cannot communicate due to the RF shaping change. SeNB may not be aware of this situation. That is, as one base station performs carrier setting/cancellation or carrier activation/deactivation, communication with a terminal in another base station may be disabled for a predetermined period of time. In this case, the other base station cannot perform an operation such as not performing downlink scheduling allocation or preventing uplink scheduling approval. In this way, a glitch problem may occur due to carrier setting/cancellation or carrier activation/deactivation in dual access.

In an embodiment of the present invention, UE capability may be used to solve the glitch problem described above.

A situation in which a glitch problem may occur in the implementation of the terminal may be a situation in which dual access is implemented as intra contiguous carrier aggregation (CA) using one RF chain in one band. However, even in the case of intra-band, when different RF chains are implemented for different carriers, a glitch problem may not occur. In consideration of this, the base station may transmit information on whether activation/deactivation of a carrier is possible to the terminal when establishing dual access.

4 is a flowchart illustrating a method of informing whether a carrier can be activated/deactivated by delivering a terminal capability in an embodiment of the present invention.

Referring to FIG. 4, in an embodiment of the present invention, the UE 410 transmits UE capability information to the MeNB 420 (S450).

The MeNB 420 determines whether dual access to the terminal is possible, and determines whether activation/deactivation of the carrier is possible in the dual access situation (S460). In a dual access situation, when the terminal 410 aggregates a plurality of carriers related to different base stations 420 and 430 using one RF chain, the MeNB 420 determines that activation/deactivation of the carrier is not possible. can do. On the other hand, when the terminal 410 implements different RF chains for each carrier in a dual access situation, the MeNB 420 may determine that activation/deactivation of the carrier is possible.

When a dual connection is configured between the MeNB 420, the SeNB 430, and the terminal 410, a bit indicating whether dual access is possible to the terminal 410 and a bit indicating whether the carrier can be activated/deactivated Is delivered (S470). The corresponding bit may indicate whether the carrier can be activated/deactivated, or may indicate whether a glitch problem occurs in the corresponding band.

When activation/deactivation of the carrier is possible, the MeNB 420 may transmit a MAC CE (Media Access Control-Control Element) including information indicating activation/deactivation to the terminal 410 (S480), or the SeNB 430 ) May deliver the MAC CE including information indicating activation/deactivation to the terminal 410.

In another embodiment of the present invention, when one base station instructs the terminal to activate/deactivate the carrier, one base station transmits information about the time at which activation/deactivation of the carrier is performed in the terminal to another base station, so that the other base station It can be used to predict glitch problems that will occur at that time.

FIG. 5 is a flowchart illustrating a first example of a method of transferring information about active/inactive time of a carrier between base stations in another embodiment of the present invention.

Referring to FIG. 5, the terminal 510 is in a dual access state in which resources are provided from the first base station 520 and the second base station 530 (S550). Here, the first base station 520 may be a MeNB and the second base station 530 may be a SeNB, or the first base station 520 may be a SeNB and the second base station 530 may be a MeNB.

When the first base station 520 determines to perform activation/deactivation on a specific carrier related to the first base station 520, the first base station 520 acts as the second base station 530 to activate the carrier in the terminal 510. / Deliver information about the time when inactivity is performed (S560). The information on the time during which activation/deactivation of the carrier is performed in the terminal 510 may be information on the time at which the first base station 520 transmits the MAC CE indicating the activation/deactivation of the carrier to the terminal 510. .

The information may be composed of time information and information on the terminal 510. The time information may include at least one of a system frame number (SFN) and a subframe number. The information on the terminal 510 may include radio network temporary identifier (RNTI) information of the terminal 510.

The second base station 530, which has received information from the first base station 520, recognizes that activation/deactivation is to be performed for the corresponding terminal 510 based on time information, and a glitch problem for a predetermined time based on the time information. It is predicted that can occur (S570). The second base station 530 will not deliver uplink/downlink scheduling, etc. to the terminal 510 for a predicted predetermined time.

When predicting the predetermined time, the second base station 530 may consider a time required when the terminal 510 changes RF shaping. When transmitting a signal from the first base station 520 to the terminal 510, the terminal 510 may not succeed in receiving a signal at one time, so the second base station 530 The predetermined time may be estimated by further considering that the time taken until the MAC CE is successfully transmitted to the terminal 510 is delayed by HARQ (Hybrid Automatic Repeat Request) retransmission.

Then, the first base station 520 transmits the active/inactive MAC CE to the terminal 510 at a predetermined time with reference to the time information transmitted to the second base station 530 (S580).

6 is a flowchart illustrating a method of transmitting control information by the first base station 520 in the example of FIG. 5.

Referring to FIG. 6, when the first base station 520 determines to perform activation/deactivation on a specific carrier related to the first base station 520, the first base station 520 serves as the second base station 530 and the terminal ( At 510), information about a time when activation/deactivation of a carrier is performed is transmitted (S610). The information on the time during which activation/deactivation of the carrier is performed in the terminal 510 may be information on the time at which the first base station 520 transmits the MAC CE indicating the activation/deactivation of the carrier to the terminal 510. .

The information may be composed of time information and information on the terminal 510. The time information may include at least one of a system frame number (SFN) and a subframe number. The information on the terminal 510 may include radio network temporary identifier (RNTI) information of the terminal 510.

Then, the first base station 520 transmits the active/inactive MAC CE to the terminal 510 at a predetermined time with reference to the time information transmitted to the second base station 530 (S620).

7 is a flowchart illustrating a method of receiving control information by the second base station 530 in the example of FIG. 5.

Referring to FIG. 7, the second base station 530 receives information about a time when the active/inactive carrier is performed in the terminal 510 from the first base station 520 (S710). The information on the time during which activation/deactivation of the carrier is performed in the terminal 510 may be information on the time at which the first base station 520 transmits the MAC CE indicating the activation/deactivation of the carrier to the terminal 510. .

The information may be composed of time information and information on the terminal 510. The time information may include at least one of a system frame number (SFN) and a subframe number. The information on the terminal 510 may include radio network temporary identifier (RNTI) information of the terminal 510.

The second base station 530, which has received information from the first base station 520, recognizes that activation/deactivation is to be performed for the corresponding terminal 510 based on time information, and a glitch problem for a predetermined time based on the time information. It is predicted that can occur (S720).

When predicting the predetermined time, the second base station 530 may consider a time required when the terminal 510 changes RF shaping. When transmitting a signal from the first base station 520 to the terminal 510, the terminal 510 may not succeed in receiving a signal at one time, so the second base station 530 The predetermined time may be estimated by further considering that the time taken until the MAC CE is successfully transmitted to the terminal 510 is delayed by HARQ (Hybrid Automatic Repeat Request) retransmission.

In addition, the second base station 530 performs control such as not transmitting uplink/downlink scheduling to the terminal 510 for a predetermined period of time (S730).

In this example, since the operation of the terminal 510 is the same as that of an existing terminal, a detailed description thereof is omitted.

FIG. 8 is a flowchart illustrating a second example of a method of transferring carrier activation/inactivity time information between base stations in another embodiment of the present invention.

Referring to FIG. 8, the terminal 810 is in a dual access state in which resources are provided from the first base station 820 and the second base station 830 (S850). Here, the first base station 820 may be a MeNB and the second base station 830 may be a SeNB, or the first base station 820 may be a SeNB and the second base station 830 may be a MeNB.

When the first base station 820 determines to perform activation/deactivation on a specific carrier related to the first base station 820, the first base station 820 is the time when the actual carrier activation/deactivation is performed to the terminal 810 A MAC CE indicating activation/deactivation of a specific carrier including information on is transmitted (S860). The time information may mean a time from when the HARQ operation is finally determined as ACK until the actual activation/deactivation operation is performed. That is, the terminal 810 will actually perform activation/deactivation after a time corresponding to the time information has elapsed based on the time when the MAC CE is successfully received through HARQ retransmission. The time information may be referred to as an SFN or a subframe unit. The time range may be set in consideration of a time delay in non-ideal backhaul between base stations, and may be expressed as, for example, 8-bit binary information.

After the MAC CE is successfully transmitted from the first base station 820 to the terminal 810, the first base station 820 transmits to the second base station 830 at the time when the carrier is activated/deactivated in the terminal 810. Information about is transmitted (S870).

The information may be composed of time information and information on the terminal 810. The time information may include at least one of a system frame number (SFN) and a subframe number. The information on the terminal 810 may include Radio Network Temporary Identifier (RNTI) information of the terminal 810.

The second base station 830, which has received information from the first base station 820, recognizes that activation/deactivation is to be performed for the corresponding terminal 810 based on time information, and a glitch problem for a predetermined time based on the time information. It is predicted that can occur (S880). The second base station 830 will not transmit uplink/downlink scheduling, etc. to the terminal 810 for a predicted predetermined time.

When predicting the predetermined time, the second base station 830 may consider a time required when the terminal 810 changes RF shaping. On the other hand, since information transfer from the first base station 820 to the second base station 830 is performed after MAC CE transfer from the first base station 820 to the terminal 810 is successful, it is different from the above-described first example. Thus, the second base station 830 does not need to consider the time delay due to HARQ retransmission.

9 is a flowchart illustrating a method of transmitting control information by the first base station 820 in the example of FIG. 8.

Referring to FIG. 9, when the first base station 820 determines to perform activation/deactivation on a specific carrier related to the first base station 820, the first base station 820 activates the actual carrier to the terminal 810. / Transmits a MAC CE indicating activation/deactivation of a specific carrier including information on the time at which deactivation is performed (S910). The time information may mean a time from when the HARQ operation is finally determined as ACK until the actual activation/deactivation operation is performed. That is, the terminal 810 will actually perform activation/deactivation after a time corresponding to the time information has elapsed based on the time when the MAC CE is successfully received through HARQ retransmission. The time information may be referred to as an SFN or a subframe unit. The time range may be set in consideration of a time delay in non-ideal backhaul between base stations, and may be expressed as, for example, 8-bit binary information.

After the MAC CE is successfully transmitted from the first base station 820 to the terminal 810, the first base station 820 transmits to the second base station 830 at the time when the carrier is activated/deactivated in the terminal 810. Information about is transmitted (S920).

The information may be composed of time information and information on the terminal 810. The time information may include at least one of a system frame number (SFN) and a subframe number. The information on the terminal 810 may include Radio Network Temporary Identifier (RNTI) information of the terminal 810.

10 is a flowchart illustrating a method of receiving control information by the second base station 830 in the example of FIG. 8.

Referring to FIG. 10, after MAC CE is successfully transmitted from the first base station 820 to the terminal 810, the second base station 830 activates the carrier in the terminal 810 from the first base station 820. Information on the time when inactivity is performed is received (S1010).

The information may be composed of time information and information on the terminal 810. The time information may include at least one of a system frame number (SFN) and a subframe number. The information on the terminal 810 may include Radio Network Temporary Identifier (RNTI) information of the terminal 810.

The second base station 830, which has received information from the first base station 820, recognizes that activation/deactivation is to be performed for the corresponding terminal 810 based on time information, and a glitch problem for a predetermined time based on the time information. It predicts that can occur (S1020).

When predicting the predetermined time, the second base station 830 may consider a time required when the terminal 810 changes RF shaping. On the other hand, since information transfer from the first base station 820 to the second base station 830 is performed after MAC CE transfer from the first base station 820 to the terminal 810 is successful, it is different from the above-described first example. Thus, the second base station 830 does not need to consider the time delay due to HARQ retransmission.

In addition, the second base station 830 performs control such as not transmitting uplink/downlink scheduling to the terminal 810 for a predetermined period of time (S1030).

11 is a flowchart illustrating a method of performing carrier activation/deactivation of the terminal 810 in the example of FIG. 8.

Referring to FIG. 11, when the first base station 820 determines to perform activation/deactivation on a specific carrier related to the first base station 820, the terminal 810 is activated by the first base station 820. / Receives a MAC CE indicating activation/deactivation of a specific carrier including information on the time at which deactivation is performed (S1110). The time information may mean a time from when the HARQ operation is finally determined as ACK until the actual activation/deactivation operation is performed. That is, the terminal 810 will actually perform activation/deactivation after a time corresponding to the time information has elapsed based on the time when the MAC CE is successfully received through HARQ retransmission. The time information may be referred to as an SFN or a subframe unit. The time range may be set in consideration of a time delay in non-ideal backhaul between base stations, and may be expressed as, for example, 8-bit binary information.

After successfully receiving the MAC CE from the first base station 820, the terminal 810 determines a time during which activation/deactivation of a specific carrier is performed based on the time information (S1120). And, when the determined time comes, the terminal 810 performs activation/deactivation of a specific carrier (S1130).

12 is a flowchart illustrating a third example of a method of transmitting active/inactive time information of a carrier between base stations in another embodiment of the present invention.

Referring to FIG. 12, the terminal 1210 is in a dual access state receiving resources from the first base station 1220 and the second base station 1230 (S1250). Here, the first base station 1220 may be a MeNB and the second base station 1230 may be a SeNB, or the first base station 1220 may be a SeNB and the second base station 1230 may be a MeNB.

The first base station 1220 transmits information about the time until activation/deactivation of a specific carrier is actually executed after the MAC CE indicating activation/deactivation of a specific carrier is transmitted to the terminal 1210 (S1260). Time information may be delivered through higher layer signaling such as Radio Resource Control (RRC). The time information may mean a time from when the HARQ operation is finally determined as ACK until the actual activation/deactivation operation is performed. That is, the terminal 1210 will actually perform activation/deactivation after a time corresponding to the time information has elapsed based on the time when the MAC CE is successfully received through HARQ retransmission. The time information may be referred to as an SFN or a subframe unit. The time range may be set in consideration of a time delay in non-ideal backhaul between base stations, and may be expressed as, for example, 8-bit binary information.

When the first base station 1220 decides to perform activation/deactivation for a specific carrier related to the first base station 1220, the first base station 1220 sends a MAC indicating activation/deactivation of the specific carrier to the terminal 1210. CE is transmitted (S1270). Unlike the above-described second example, in this example, the MAC CE indicating activation/deactivation of a carrier does not include time information.

After the MAC CE is successfully transmitted from the first base station 1220 to the terminal 1210, the first base station 1220 sends the second base station 1230 to the second base station 1230 at the time when the carrier is activated/deactivated. Information about is transmitted (S1280).

The information may be composed of time information and information on the terminal 1210. The time information may include at least one of a system frame number (SFN) and a subframe number. The information on the terminal 1210 may include radio network temporary identifier (RNTI) information of the terminal 1210.

The second base station 1230, which has received the information from the first base station 1220, recognizes that activation/deactivation is to be performed for the terminal 810 based on the time information, and a glitch problem for a predetermined time based on the time information. It is predicted that can occur (S1290). The second base station 1230 will not deliver uplink/downlink scheduling, etc. to the terminal 1210 for a predicted predetermined time.

When predicting the predetermined time, the second base station 1230 may consider a time required when the terminal 1210 changes RF shaping. On the other hand, since information transfer from the first base station 1220 to the second base station 1230 is performed after MAC CE transfer from the first base station 1220 to the terminal 1210 is successful, it is different from the above-described first example. In other words, the second base station 1230 does not need to consider a time delay due to HARQ retransmission.

13 is a flowchart illustrating a method of transmitting control information by the first base station 1220 in the example of FIG. 12.

Referring to FIG. 13, after the MAC CE indicating activation/deactivation of a specific carrier is transmitted to the terminal 1210, the first base station 1220 provides information on the time until activation/deactivation of a specific carrier is actually executed. It transmits (S1310). Time information may be delivered through higher layer signaling such as RRC. The time information may mean a time from when the HARQ operation is finally determined as ACK until the actual activation/deactivation operation is performed. That is, the terminal 1210 will actually perform activation/deactivation after a time corresponding to the time information has elapsed based on the time when the MAC CE is successfully received through HARQ retransmission. The time information may be referred to as an SFN or a subframe unit. The time range may be set in consideration of a time delay in non-ideal backhaul between base stations, and may be expressed as, for example, 8-bit binary information.

When the first base station 1220 decides to perform activation/deactivation for a specific carrier related to the first base station 1220, the first base station 1220 sends a MAC indicating activation/deactivation of the specific carrier to the terminal 1210. CE is transmitted (S1320). Unlike the above-described second example, in this example, the MAC CE indicating activation/deactivation of a carrier does not include time information.

After the MAC CE is successfully transmitted from the first base station 1220 to the terminal 1210, the first base station 1220 sends the second base station 1230 to the second base station 1230 at the time when the carrier is activated/deactivated. The information about it is transmitted (S1330).

The information may be composed of time information and information on the terminal 1210. The time information may include at least one of a system frame number (SFN) and a subframe number. The information on the terminal 1210 may include radio network temporary identifier (RNTI) information of the terminal 1210.

Meanwhile, since the operation of the second base station 1230 in this example is the same as that of FIG. 10, a detailed description thereof is omitted.

14 is a flowchart illustrating a method of performing carrier activation/deactivation of the terminal 1210 in the example of FIG. 12.

Referring to FIG. 14, the terminal 1210 stores information on the time until activation/deactivation of a specific carrier is actually executed after a MAC CE indicating activation/deactivation of a specific carrier is transmitted from the first base station 1220. It receives (S1410). Time information may be delivered through higher layer signaling such as RRC. As an example, the time information may be transmitted as one information element (IE) in the MAC-MainConfig IE in the RRC connection reconfiguration message, which is an RRC message. The time information may mean a time from when the HARQ operation is finally determined as ACK until the actual activation/deactivation operation is performed. That is, the terminal 1210 will actually perform activation/deactivation after a time corresponding to the time information has elapsed based on the time when the MAC CE is successfully received through HARQ retransmission. The time information may be referred to as an SFN or a subframe unit. The time range may be set in consideration of a time delay in non-ideal backhaul between base stations, and may be expressed as, for example, 8-bit binary information.

When the first base station 1220 determines to perform activation/deactivation for a specific carrier related to the first base station 1220, the terminal 1210 receives a MAC indicating activation/deactivation of the specific carrier from the first base station 1220. CE is received (S1420). Unlike the above-described second example, in this example, the MAC CE indicating activation/deactivation of a carrier does not include time information.

After successfully receiving the MAC CE from the first base station 1220, the terminal 1210 determines a time during which activation/deactivation of a specific carrier is performed based on the time information (S1430). And, when the determined time comes, the terminal 1210 performs activation/deactivation of a specific carrier (S1440).

In the above-described third example, although the base station transmitting time information to the terminal and the base station transmitting MAC CE to the terminal are described as the same, they may be different from each other. That is, when one base station transmits time information that can be commonly applied to all base stations to the terminal, and when any base station transmits MAC CE, the time information may be used. For example, the MeNB may transmit time information commonly used for activation/deactivation of carriers included in the MCG and SCG to the terminal.

In the above-described examples of FIGS. 8 and 12, it is described that time information is transmitted from the base station to the terminal, but this time information may be a predefined value.

In the examples of FIGS. 8 and 12 described above, time information transmitted from the base station to the terminal may be a relative time, and time information transmitted between the base stations may be an absolute time.

15 is a block diagram showing a configuration of a base station according to an embodiment of the present invention.

Referring to FIG. 15, the base station 1500 may include a control unit 1510, a base station communication unit 1520, and a terminal communication unit 1530.

The controller 1510 controls the overall operation of the base station 1500. The base station communication unit 1520 performs communication with another base station, and the terminal communication unit 1530 performs communication with the terminal.

The base station 1500 may be a base station instructing the terminal to activate or deactivate a specific carrier.

In this case, the base station communication unit 1520 may transmit information about a time during which activation or deactivation of a specific carrier is performed in the terminal to another base station providing resources to the terminal. The information on the time at which activation or deactivation of a specific carrier is performed may be a time when the MAC CE is transmitted from the base station 1500 to the terminal, or a time when activation or deactivation of a specific carrier is actually performed by the terminal.

The terminal communication unit 1530 may transmit information instructing activation or deactivation of a specific carrier to the terminal. Information indicating activation or deactivation of a specific carrier may be transmitted using MAC CE. In an embodiment, the terminal communication unit 1530 may transmit information about a time during which activation or deactivation of a specific carrier is performed to the terminal. The time information may be included in the MAC CE and transmitted, or may be transmitted separately from the MAC CE through RRC signaling.

The base station 1500 may be a base station other than a base station instructing the terminal to activate or deactivate a specific carrier.

In this case, the base station communication unit 1520 may receive information about a time during which activation or deactivation of a specific carrier is performed in the terminal from another base station providing resources to the terminal. The information on the time when activation or deactivation of a specific carrier is performed may be a time when MAC CE is transmitted from another base station to the terminal, or a time when activation or deactivation of a specific carrier is actually performed by the terminal.

The controller 1510 may set a time during which downlink or uplink scheduling is not transmitted to the terminal based on information about a time when activation or deactivation of a specific carrier is performed. In one example, the control unit 1510 may consider a time when MAC CE transmission is successful from another base station to a terminal by HARQ retransmission.

The terminal communication unit 1530 does not perform communication with the terminal at the set time.

16 is a block diagram showing a configuration of a terminal according to an embodiment of the present invention.

Referring to FIG. 16, the terminal 1600 includes a control unit 1610, a reception unit 1620, and a transmission unit 1630.

The controller 1610 controls the overall operation of the terminal 1600. The receiving unit 1620 receives a signal from the base station, and the transmitting unit 1630 transmits the signal to the terminal.

The receiver 1610 may receive a MAC CE including information on a time when activation or deactivation of a specific carrier is performed from the base station.

In one example, the controller 1610 may activate or deactivate a carrier when receiving the MAC CE.

In another example, the controller 1610 may activate or deactivate a carrier after a predetermined time has elapsed from the time when the MAC CE is received. The information on the predetermined time may be included in the MAC CE indicating activation or deactivation of the carrier and transmitted, or may be delivered through signaling separate from the MAC CE indicating activation or deactivation of the carrier, for example, RRC signaling. .

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Claims (20)

A method for transmitting control information of a base station in a communication system in which a terminal operates by receiving resources from at least two base stations using a plurality of carriers in a dual access situation,
Transmitting information about a time when activation or deactivation of a specific carrier set for the terminal is performed by the terminal to another base station providing resources to the terminal; And
And transmitting information indicating activation or deactivation of the specific carrier to the terminal. delete A method for transmitting control information of a base station in a communication system in which a terminal operates by receiving resources from at least two base stations using a plurality of carriers in a dual access situation,
After receiving a message about whether activation/deactivation of a specific carrier set for the terminal is possible from the terminal, the terminal provides time information for the activation or deactivation of the specific carrier and information indicating activation or deactivation of the specific carrier. Transmitting to the terminal; And
And transmitting, in the terminal, information about a time when activation or deactivation of the specific carrier is to be performed to another base station providing resources to the terminal. delete delete delete delete delete delete delete As a base station in a communication system in which a terminal operates by receiving resources from at least two base stations using a plurality of carriers in a dual access situation,
A base station communication unit for transmitting information about a time when activation or deactivation of a specific carrier set for the terminal is performed by the terminal to another base station providing resources to the terminal; And
A base station comprising a terminal communication unit for transmitting information indicating activation or deactivation of the specific carrier to the terminal. delete As a base station in a communication system in which a terminal operates by receiving resources from at least two base stations using a plurality of carriers in a dual access situation,
After receiving a message about whether activation/deactivation of a specific carrier set for the terminal is possible from the terminal, the terminal provides time information for the activation or deactivation of the specific carrier and information indicating activation or deactivation of the specific carrier. A terminal communication unit for transmitting to the terminal; And
A base station comprising a base station communication unit for transmitting information on a time when activation or deactivation of the specific carrier is performed in the terminal to another base station providing resources to the terminal. delete delete delete delete delete delete delete

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