KR20210000245A - Method and apparatus for controlling packet duplication transmission in a wireless communication system - Google Patents

Abstract

The present invention provides a method for controlling packet duplication transmission of a terminal which comprises the steps of: receiving an activation control message of an RLC bearer for packet duplication transmission; controlling activation of at least one RLC bearer based on the received RLC bearer activation control message; determining whether only one RLC bearer among at least one RLC bearer corresponding to a predetermined cell group is activated; and determining whether a cell restriction of the cell group is released based on a determination result.

Description

Method and apparatus for controlling packet redundancy transmission in a wireless communication system {METHOD AND APPARATUS FOR CONTROLLING PACKET DUPLICATION TRANSMISSION IN A WIRELESS COMMUNICATION SYSTEM}

The present disclosure relates to a method and apparatus for controlling redundant packet transmission in a wireless communication system.

Efforts are being made to develop an improved 5G communication system or a pre-5G communication system in order to meet the increasing demand for wireless data traffic after the commercialization of 4G communication systems. For this reason, the 5G communication system or the pre-5G communication system is called a communication system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE). In order to achieve a high data rate, the 5G communication system is being considered for implementation in the ultra-high frequency (mmWave) band (eg, 60 gigabyte (80 GHz) band). In order to mitigate the path loss of radio waves in the ultra-high frequency band and increase the transmission distance of radio waves, in 5G communication systems, beamforming, massive MIMO, and Full Dimensional MIMO (FD-MIMO) ), array antenna, analog beam-forming, and large scale antenna technologies are being discussed. In addition, in order to improve the network of the system, in 5G communication system, advanced small cell, advanced small cell, cloud radio access network (cloud RAN), ultra-dense network , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation And other technologies are being developed. In addition, in the 5G system, advanced coding modulation (ACM) methods such as Hybrid FSK and QAM Modulation (FQAM) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as Filter Bank Multi Carrier (FBMC), NOMA (non-orthogonal multiple access), and sparse code multiple access (SCMA) have been developed.

On the other hand, the Internet is evolving from a human-centered network in which humans generate and consume information, to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied. In the IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is the field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, advanced medical service, etc. through the convergence and combination of existing IT (information technology) technology and various industries. Can be applied to.

Accordingly, various attempts have been made to apply a 5G communication system to an IoT network. For example, technologies such as sensor network, machine to machine (M2M), and machine type communication (MTC) are implemented by techniques such as beamforming, MIMO, and array antenna, which are 5G communication technologies. . The application of a cloud radio access network (cloud RAN) as the big data processing technology described above can be said as an example of the convergence of 3eG technology and IoT technology.

As described above, as it is possible to provide various services according to the development of a wireless communication system, there is a need for a method for smoothly providing services by using packet redundant transmission, especially in a wireless communication system.

The disclosed embodiment is to provide an apparatus and method capable of effectively supporting a service in a wireless communication system.

According to an embodiment of the present disclosure, there is provided a method for controlling packet redundant transmission of a terminal, the method comprising: receiving an RLC bearer activation control message for redundant packet transmission; Controlling activation of at least one RLC bearer based on the received RLC bearer activation control message; Determining whether only one RLC bearer among at least one RLC bearer corresponding to a predetermined cell group is activated; And determining whether to release the cell restriction of the cell group based on the determination result.

The disclosed embodiment provides an apparatus and method capable of effectively providing a service in a wireless communication system.

1 is a diagram illustrating a structure of a radio bearer in which packet redundant transmission is configured according to an embodiment of the present disclosure.
2 is a diagram illustrating activation and deactivation operations of an RLC device according to an embodiment of the present disclosure.
3 is a diagram illustrating another operation of activation and deactivation of an RLC device according to an embodiment of the present disclosure.
4 is a diagram illustrating an activation and deactivation operation of an RLC device according to an embodiment of the present disclosure.
5 is a diagram illustrating a format of a message for controlling activation and deactivation of an RLC bearer of a radio bearer in which packet redundant transmission is configured according to an embodiment of the present disclosure.
6 is a diagram illustrating a format of another message for controlling activation and deactivation of an RLC bearer of a radio bearer in which packet redundancy transmission is configured according to an embodiment of the present disclosure.
7 is a diagram illustrating another format of a message for controlling activation and deactivation of an RLC bearer of a radio bearer in which packet redundancy transmission is configured according to an embodiment of the present disclosure.
8 is a diagram illustrating an operation of releasing a cell restriction for redundant packet transmission according to an embodiment of the present disclosure.
9 is a diagram illustrating a detailed process of releasing a cell restriction for redundant packet transmission according to an embodiment of the present disclosure.
10 is a block diagram illustrating an internal structure of a terminal according to an embodiment of the present disclosure.
11 is a block diagram showing a configuration of a base station according to an embodiment of the present disclosure.
12 illustrates an operation of transmitting PDCP configuration information of an SRB according to an embodiment of the present disclosure.
13 illustrates an operation in which PDCP configuration information of an SRB is transmitted according to an embodiment of the present disclosure.
14 illustrates an operation for transmitting PDCP configuration information of a DRB according to an embodiment of the present disclosure.

In the following description of the present disclosure, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present disclosure, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present disclosure and may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present disclosure. A term for identifying an access node used in the following description, a term for network entities, a term for messages, a term for an interface between network objects, a term for various identification information And the like are illustrated for convenience of description. Accordingly, the present disclosure is not limited to the terms described later, and other terms referring to objects having an equivalent technical meaning may be used.

Hereinafter, the base station is a subject that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a radio access unit, a base station controller, or a node on a network. The terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. In addition, the term terminal may refer to mobile phones, NB-IoT devices, sensors as well as other wireless communication devices. Of course, the base station and the terminal are not limited to the above example.

For convenience of description below, the present invention uses terms and names defined in the 3GPP 3rd Generation Partnership Project Long Term Evolution (LTE) standard and/or 3rd Generation Partnership Project New Radio (NR). However, the present disclosure is not limited by the terms and names.

In addition, the embodiments of the present disclosure will be described below as an example of an LTE, LTE-A, LTE Pro or 5G (or NR, next-generation mobile communication) system, but the present disclosure is also provided in other communication systems having a similar technical background or channel type. An embodiment of can be applied. In addition, the embodiments of the present disclosure may be applied to other communication systems through some modifications without significantly departing from the scope of the present disclosure, as determined by a person having skilled technical knowledge.

Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the accompanying drawings.

1 is a diagram illustrating a structure of a radio bearer in which packet redundant transmission is configured according to an embodiment of the present disclosure. Packet redundant transmission may mean that a transmitter duplicates a packet and transmits a packet through multiple paths. Referring to FIG. 1, in a radio bearer structure, in order to support a plurality of paths, one packet data convergence protocol (PDCP) device 110 is provided with RLC1 (120), RLC2 (121), RLC3 (122), and RLC4 (123). A total of 4 RLC devices can be connected. However, the number of RLC devices to be connected to the PDCP device 110 is not limited to the illustration of FIG. 1, and the number of RLC devices connected to the PDCP device 110 may be set by the base station according to the radio link and network structure.

At this time, the device performing packet duplication may be the PDCP device 110, and the PDCP device 110 performs packet duplication and then transfers the duplicated packets to two or more different Radio Link Control (RLC) devices 120 To 123). Also, each RLC device 120 to 123 may independently perform packet transmission. Since one radio bearer may have one PDCP device 110 irrespective of packet duplication, the PDCP device 110 may correspond to one radio bearer ID. In the embodiment of FIG. 1, a radio bearer corresponding to the PDCP device 110 is illustrated as a data radio bearer (DRB), but is not limited thereto, and may be a signaling radio bearer (SRB).

In addition, according to an exemplary embodiment of the present disclosure, the RLC device may be classified into a primary RLC device 120 and a secondary RLC device 121, 122, 123 according to a use. The primary RLC device may mean an RLC device that performs at least one of the following two roles. Of course, it is not limited to the following examples.

-Means an RLC device that is not deactivated as a device that always transmits packets regardless of the activation of packet redundancy.

-May mean an RLC device that transmits a PDCP control Protocol Data Unit (PDU). If the PDCP control PDU is not repeatedly transmitted, the PDCP control PDU can be transmitted to the primary RLC device.

Further, according to an embodiment of the present disclosure, the secondary RLC device may mean an RLC device other than the primary RLC device.

Each RLC device 120 to 123 may have a list of cells that can be used for transmission. If a cell list is set, each RLC device 120 to 123 cannot transmit an RLC PDU using all cells configured in the terminal within the cell group, and may transmit an RLC PDU through a cell in the configured cell list. Of course, it is not limited to the above example. According to some embodiments of the present disclosure, the list of cells may be referred to as'Cell Restriction' because the list of cells limits the cells that can be used by the RLC device or the RLC bearer.

Referring to FIG. 1, RLC1 120 may use Cell1 130, RLC2 121 may use Cell2 131 and Cell 3 132 , RLC3 (122) may use Cell4 (133), RLC4 (123) may use Cell5 (Cell5) (134). Of course, it is not limited to the illustrated example.

According to an embodiment of the present disclosure, Cell 1 130, Cell 2 131, and Cell 3 132 may be cells set in the first cell group 140, and Cell 4 133 and Cell 5 134 ) May be a cell set in the second cell group 141. If the first cell group 140 is a master cell group (MCG), RLC1 120 and RLC2 121, which are RLC devices capable of using the cell of the MCG, may be referred to as MCG RLC, and if the second If the cell group 141 is a secondary cell group (SCG), RLC3 122 and RLC4 123, which are RLC devices capable of using SCG cells, may be referred to as SCG RLCs.

According to an embodiment of the present disclosure, an RLC and a MAC logical channel are grouped together to be referred to as an'RLC bearer', and when the RLC bearer is in the MCG, that is, when the MCG RLC is included, it may be referred to as an MCG RLC bearer, and the RLC bearer When is in the SCG, that is, when including the SCG RLC, it can be referred to as an SCG RLC bearer.

When redundant packet transmission is set and activated, the PDCP device 110 of the transmitter can transmit the duplicated packet to all activated RLC devices among the configured primary RLC device 120 and secondary RCL devices 121, 122, and 123. have. If the packet redundancy transmission is not performed and the split bearer is applied, the PDCP device 110 can transmit the packet only to the primary RLC device 120 when the data to be transmitted by the transmitter is less than (or less than) a specific threshold. When the amount exceeds (or exceeds), a packet may be transmitted to one of the activated RLC devices among the primary RLC device 120 and the secondary RLC device 121, 122, and 123. The detailed operation described above may be included in at least one of radio bearer configuration, RLC configuration, and PDCP configuration of the RRC configuration message and transmitted to the terminal.

Also, according to an embodiment of the present disclosure, the PDCP device may be referred to as a PDCP layer or a PDCP layer device, and the RLC device may be referred to as an RLC layer or an RLC layer device. Of course, it is not limited to the above example.

2 illustrates activation and deactivation operations of an RLC device according to an embodiment of the present disclosure. In a dual connectivity (DC) structure, the terminal 200 may have a connection state with two network nodes of a master base station (Master gNB, MgNB) 210 and a secondary base station (Secondary gNB, SgNB) 220. The cell group managed by the master base station 210 may be a master cell group (MCG), and the cell group managed by the secondary base station 220 may be a secondary cell group (SCG).

According to an embodiment of the present disclosure, when a radio bearer configured for packet redundant transmission described in FIG. 1 is configured in a dual connection structure, activation or deactivation of an RLC device to be used for redundant packet transmission or activation of redundant packet transmission for a radio bearer Can be controlled by a specific base station. In other words, for each radio bearer, the master base station 210 or the secondary base station 220, or the master base station 210 and the secondary base station 220 activate and deactivate packet redundant transmission or activate RLC device to be used for packet redundant transmission. And deactivation can be controlled. Accordingly, when a radio bearer in which packet redundant transmission is configured is set, it may be determined in advance by which base station the redundant packet transmission and activation and deactivation of the RLC device will be controlled. The setting of which base station will control the redundant packet transmission and activation and deactivation of the RLC device may be set by an RRC configuration message or may be determined by a predetermined rule.

According to an embodiment of the present disclosure, activation and deactivation of an MCG RLC bearer may be controlled by a master base station, and activation and deactivation of an SCG RLC bearer may be controlled by a secondary base station. Of course, it is not limited to the above example.

In the embodiment of FIG. 2, the master base station 210 may transmit an activation and deactivation message 240 of the RLC device controlled by the master base station 210 to the terminal 200. The terminal 200 may apply activation and deactivation of the RLC device controlled by the master base station 210. The master base station 210 may include an MCG MAC corresponding to the master node, and the activation and deactivation message 240 transmitted by the master base station 210 may include a MAC CE (Control Element).

Similarly, the secondary base station 220 may transmit an activation and deactivation message 250 of the RLC device controlled by the secondary base station 220 to the terminal 200. The terminal 200 may apply activation and deactivation of the RLC device controlled by the secondary base station 220. The secondary base station 220 may include an SCG MAC corresponding to the secondary node, and the activation and deactivation message 250 transmitted by the secondary base station 220 may include a MAC CE (Control Element).

3 illustrates activation and deactivation operations of an RLC device according to an embodiment of the present disclosure. In a dual connectivity (DC) structure, the terminal 300 may have a connection state with two network nodes of a master base station (Master gNB, MgNB) 310 and a secondary base station (Secondary gNB, SgNB) 320. The cell group managed by the master base station 310 may be a master cell group (MCG), and the cell group managed by the secondary base station 320 may be a secondary cell group (SCG).

According to an embodiment of the present disclosure, when a radio bearer configured for packet redundant transmission described in FIG. 1 is configured in a dual connection structure, activation or deactivation of an RLC device to be used for redundant packet transmission or activation of redundant packet transmission for a radio bearer Can be controlled by a specific base station. In other words, for each radio bearer, the master base station 310 or the secondary base station 320 or the master base station 310 and the secondary base station 320 activate and deactivate packet redundant transmission or activate and deactivate an RLC device to be used for packet redundant transmission. Deactivation can be controlled.

Accordingly, when a radio bearer in which packet redundant transmission is configured is set, it may be determined in advance by which base station the redundant packet transmission and activation and deactivation of the RLC device will be controlled.

Referring to FIG. 3, activation and deactivation of an MCG RLC bearer may be controlled by a master base station 310, and activation and deactivation of an SCG RLC bearer may be controlled by a secondary base station 320. Since the MCG RLC bearer is connected to the MAC and RLC devices of the master base station 310, it may be efficient to control activation and deactivation of the corresponding RLC device in the master base station 310. Similarly, since the SCG RLC bearer is connected to the MAC and RLC devices of the secondary base station 320, it may be efficient to control activation and deactivation of the corresponding RLC device in the secondary base station 320. Of course, it is not limited to the above example.

In the embodiment of FIG. 3, the master base station 310 may transmit an activation and deactivation message 340 for the RLC device of the MCG RLC bearer to the terminal 300. At this time, the terminal 300 may apply activation and deactivation of the RLC device of the MCG RLC bearer. The master base station 310 may include an MCG MAC corresponding to the master node, and the activation and deactivation message 340 may include a MAC Control Element (CE).

Similarly, the secondary base station 320 may transmit an activation and deactivation message 350 for the RLC device of the SCG RLC bearer to the terminal 300. The terminal 300 may apply activation and deactivation of the RLC device of the SCG RLC bearer. The secondary base station 320 may include an SCG MAC corresponding to the secondary node, and the activation and deactivation message 350 may include a MAC CE (Control Element).

4 illustrates activation and deactivation of an RLC device in a radio bearer in which redundant packet transmission is configured according to an embodiment of the present disclosure. 4, as described in FIG. 1, one PDCP device 410 corresponds to one radio bearer, and one PDCP device 410 corresponds to four RLC devices 420, 421, 422, 423. Can be connected. In addition, RLC1 420 may be a primary RLC device, and RLC2 421, RLC3 422, and RLC4 423 may be secondary RLC devices.

Also, according to an embodiment of the present disclosure, the primary RLC device may mean an RLC device that performs at least one of the following two roles. Of course, it is not limited to the following examples.

-Means an RLC device that is not deactivated as a device that always transmits packets regardless of the activation of packet redundancy.

-It means an RLC device that transmits a PDCP control PDU. If the PDCP control PDU is not repeatedly transmitted, the PDCP control PDU can be transmitted to the primary RLC device.

Further, according to an embodiment of the present disclosure, the secondary RLC device may mean an RLC device other than the primary RLC device. Of course, it is not limited to the above example, and the primary RLC device and the secondary RLC device may not be distinguished. Each RLC device 420 to 423 may have a list of cells that can be used for transmission. If a cell list is set, each RLC device 420 to 423 cannot transmit an RLC PDU using all cells set in the UE within the cell group, and may transmit the RLC PDU through a cell in the set cell list. Of course, it is not limited to the above example. 4, RLC1 420 can use cell 1 430, RLC2 421 can use cell 2 431 and cell 3 432, and RLC3 422 can use cell 4 ( 433) can be used, and RLC4 (423) can use Cell 5 (434). Cell 1 430, cell 2 431, and cell 3 432 may be a first cell group 440, and cells 4 433 and 5 434 may be cells set in a second cell group.

According to an embodiment of the present disclosure, each RLC bearer of a radio bearer in which packet redundant transmission is configured may be activated or deactivated. As described in FIGS. 2 and 3, each RLC bearer of a radio bearer in which packet redundancy transmission is configured may be activated or deactivated by an activation or deactivation message transmitted from a base station that controls activation or deactivation of each RLC bearer.

Referring to FIG. 4, RLC1 420 and RLC3 422 are activated (450, 452), and RLC2 421 and RLC4 434 are deactivated (451, 453). In a radio bearer in which packet redundant transmission is configured, the PDCP device 410 duplicates the PDCP PDU to be transmitted, and then transmits the duplicated PDCP PDU to the RLC device (420. 422) of each activated RLC bearer to perform independent transmission. have.

According to an embodiment of the present disclosure, when redundant packet transmission is activated, the PDCP device 410 of the terminal may duplicate a Protocol Data Unit (PDU), which is PDCP data, and transmit it to the activated RLC device. When redundant packet transmission is disabled, the PDCP device 410 may perform transmission by transferring the PDCP PDU to the primary RLC device 420 without duplicating the PDCP PDU.

For example, in the case of a PDCP control PDU, the PDCP device 410 may transmit to the primary RLC 420 for transmission. If packet redundant transmission of the PDCP control PDU is set, the PDCP control PDU may be duplicated in the PDCP device 410 and transmitted to the activated RLC bearer. Packet redundancy transmission of the PDCP control PDU may be configured by an RRC configuration message of the base station. Of course, it is not limited to the above example.

5 shows a format of a message for controlling activation and deactivation of an RLC bearer of a radio bearer in which packet redundant transmission is configured according to an embodiment of the present disclosure. The message for controlling activation and deactivation of the RLC bearer of the radio bearer with redundant packet transmission of FIG. 5 is indicated in the MAC CE format, but may be a message of another format, and is not limited to the format shown in FIG. 5. The message for controlling activation and deactivation of the RLC bearer of FIG. 5 may consist of 1 byte (8 bits), and may be a MAC CE controlling activation and deactivation of the RLC bearer for one radio bearer.

According to an embodiment of the present disclosure, the MAC CE shown in FIG. 5 may include a bitmap 510 for each RLC bearer or corresponding RLC device. Each bit of the bitmap 510 may indicate activation and deactivation of each RLC bearer. For example, if a predetermined bit in the bitmap 510 has a value of 1, the corresponding RLC bearer is activated, and if it has a value of 0, the corresponding RLC bearer may be deactivated.

According to an embodiment of the present disclosure, the Ri bit of the bitmap may mean a bit indicating activation or deactivation of the i-th RLC bearer. The number of bearers the RLC bearer is may be set by an RRC configuration message or the like, or may be determined by a logical channel ID of the RLC bearer and a cell group to which the RLC bearer belongs. The number of RLC bearers the RLC bearer is may be determined by one of the following rules. Of course, it is not limited to the following examples.

-Ascending (or descending) order of logical channel IDs for RLC bearers belonging to the cell group to which the corresponding activation and deactivation MAC CE is transmitted

-Ascending (or descending) order of logical channel IDs for MCG RLC bearers, and then ascending (or descending order) of logical channel IDs for SCG RLC bearers

-In ascending (or descending) order of logical channel IDs for RLC bearers that the activation and deactivation MAC CE controls activation and deactivation, if the logical channel IDs are the same, MCG RLC bearers take precedence.

-Ascending (or descending) logical channel ID for the MCG RLC bearer, which the corresponding activation and deactivation MAC CE controls activation and deactivation, then the logical channel to the SCG RLC bearer, which the corresponding activation and deactivation MAC CE controls activation and deactivation. ID in ascending (or descending) order

If the UE receives the Ri bit for an RLC bearer that is not controlled by the base station sending the MAC CE, the corresponding Ri bit may be ignored. In addition, the message of FIG. 5 may include a spare bit 520, which may be an unused bit to adjust the size of the message in byte units (eg, multiples of 8 bits), and of course, limited to the above example. It doesn't work. For example, the reserved bit 520 may include information other than Ri bits for activation and deactivation of the RLC bearer. Of course, it is not limited to the above example.

6 shows a format of another message for controlling activation and deactivation of an RLC bearer of a radio bearer in which packet redundant transmission is configured according to an embodiment of the present disclosure. The message for controlling activation and deactivation of the RLC bearer of the radio bearer with redundant packet transmission of FIG. 6 is displayed in the MAC CE format, but may be a message of another format, and is not limited to the format shown in FIG. . The message of FIG. 6 may consist of 2 bytes (16 bits), and may be a MAC CE that controls activation and deactivation of RLC bearers for four radio bearers.

According to an embodiment of the present disclosure, the MAC CE shown in FIG. 6 may include bitmaps 600, 610, 620, and 630 for each RLC bearer or corresponding RLC device. Each bit of the bitmaps 600 to 630 may indicate activation and deactivation of each RLC bearer. For example, if a predetermined bit in the bitmaps 600 to 630 has a value of 1, the corresponding RLC bearer is activated, and if it has a value of 0, the corresponding RLC bearer may be deactivated.

According to an embodiment of the present disclosure, the Rij bit of the bitmap may mean a bit indicating activation or deactivation of the j-th RLC bearer of the i-th radio bearer. The number of bearers of the radio bearer and the number of bearers of the RLC bearer may be set by an RRC configuration message, etc., and the data radio bearer (DRB) ID or logical channel ID of the RLC bearer and the cell group to which the RLC bearer belongs May be determined by

According to an embodiment of the present disclosure, a radio bearer for which packet redundancy transmission is configured may be determined by one of the following rules. Of course, it is not limited to the following examples.

-Ascending (or descending) order of DRB (Data Radio Bearer) ID of a radio bearer for which duplicate packet transmission is set

-At least one RLC bearer (or RLC device) among radio bearers for which packet redundancy transmission is configured is in ascending (or descending) order of DRB IDs of radio bearers belonging to the cell group to which the corresponding MAC CE is transmitted

-At least one RLC bearer (or RLC device) among radio bearers for which packet redundancy transmission is configured is in ascending order (or descending order) of the DRB ID of the radio bearer whose activation and deactivation is controlled by the corresponding MAC CE

According to an embodiment of the present disclosure, the number of RLC bearers the RLC bearer is may be determined by one of the following rules. Of course, it is not limited to the following examples.

-Ascending (or descending) order of logical channel IDs for RLC bearers belonging to the cell group to which the corresponding activation and deactivation MAC CE is transmitted

-Ascending (or descending) order of logical channel IDs for MCG RLC bearers, and then ascending (or descending order) of logical channel IDs for SCG RLC bearers

-In ascending order (or descending order) of logical channel IDs for RLC bearers that the activation and deactivation MAC CE controls activation and deactivation. If the logical channel IDs are the same, the MCG RLC bearer takes precedence.

-Ascending (or descending) logical channel ID for the MCG RLC bearer, which the corresponding activation and deactivation MAC CE controls activation and deactivation, then the logical channel to the SCG RLC bearer, which the corresponding activation and deactivation MAC CE controls activation and deactivation. ID in ascending (or descending) order

If the UE receives the Rij bit for an RLC bearer that is not controlled by the base station sending the MAC CE, the corresponding Ri bit may be ignored.

In the embodiment of FIG. 6, as an example, activation or deactivation of RLC bearers of a radio bearer in which four packet redundant transmissions are configured. However, unlike the example of FIG. 6, a bitmap for a radio bearer in which packet redundant transmission is configured may be included. In addition, in another embodiment, the number of RLC bearers for which activation and deactivation of RLC bearers is controlled by MAC CE may be variable. For example, there may be at least one RLC bearer controlled by activation and deactivation by MAC CE, and a bitmap for a radio bearer connected to at least one RLC bearer may be variable. When the number of radio bearers with RLC bearers whose activation and deactivation is controlled by MAC CE is variable, or when the number of RLC bearers is variable, the length of the MAC CE has a variable length, so the MAC subheader has L (Length , Length) field may be included.

According to an embodiment of the present disclosure, if it is possible to clearly know which radio bearer for which packet redundancy transmission is configured is controlled by the corresponding MAC CE, the length of the corresponding MAC CE can be accurately known. In this case, there is no need to have a separate L field. For example, in the embodiment of FIG. 6, if activation and deactivation of RLC bearers for a total of four radio bearers is to be controlled by MAC CE, the length of the corresponding MAC CE is 2 bytes, so that there is no need for L bits. In this case, the L field may be a MAC CE that is not included in the MAC subheader. In addition, the spare bit 520 shown in FIG. 5 may be included in the MAC CE of FIG. 6, which determines the size of a message controlling activation and deactivation of the RLC bearer in bytes (for example, a multiple of 8 bits). This is an unused bit to match with.

7 shows a format of a message for controlling activation and deactivation of an RLC bearer of a radio bearer in which packet redundant transmission is configured according to an embodiment of the present disclosure. The message for controlling activation and deactivation of the RLC bearer of the radio bearer with redundant packet transmission of FIG. 7 is indicated in the MAC CE format, but may be a message of another format, and is not limited to the format shown in FIG. 7. The activation and deactivation message for the RLC bearer of FIG. 7 may consist of 1 byte (8 bits), and may be a MAC CE that controls activation and deactivation of the RLC bearer for one radio bearer.

According to an embodiment of the present disclosure, the MAC CE shown in FIG. 7 includes an activation/deactivation (A/D) bit 710 indicating activation and deactivation of packet redundant transmission of a radio bearer and each RLC bearer or corresponding RLC. It may include a bitmap 720 for the device.

According to an embodiment of the present disclosure, the A/D bit 710 may indicate activation or deactivation of a packet redundant transmission function. For example, if the A/D bit 710 has a value of 1, redundant packet transmission is activated, and a value of 0 may mean that redundant packet transmission is deactivated. If redundant packet transmission is activated, the PDCP device duplicates the PDCP PDU and then delivers the duplicated PDCP PDUs to the RLC device of the activated RLC bearer. When redundant packet transmission is deactivated, a deactivation operation of redundant packet transmission is performed.

In addition, according to an embodiment of the present disclosure, the bitmap 720 for each RLC bearer or corresponding RLC device may mean activation or deactivation of each RLC bearer. For example, a predetermined number in the bitmap 720 If the bit of is 1, the corresponding RLC bearer is activated, and if it has a value of 0, the corresponding RLC bearer can be deactivated.

According to an embodiment of the present disclosure, the Ri bit of the bitmap may mean a bit indicating activation or deactivation of the i-th RLC bearer. The number of bearers the RLC bearer is may be set by an RRC configuration message or the like, or may be determined by a logical channel ID of the RLC bearer and a cell group to which the RLC bearer belongs. The number of RLC bearers the RLC bearer is may be determined by one of the following rules. Of course, it is not limited to the following examples.

-Ascending (or descending) order of logical channel IDs for RLC bearers belonging to the cell group to which the corresponding activation and deactivation MAC CE is transmitted

-Ascending (or descending) order of logical channel IDs for MCG RLC bearers, and then ascending (or descending order) of logical channel IDs for SCG RLC bearers

-In ascending order (or descending order) of logical channel IDs for RLC bearers that the activation and deactivation MAC CE controls activation and deactivation. If the logical channel IDs are the same, the MCG RLC bearer takes precedence.

-Ascending (or descending) logical channel ID for the MCG RLC bearer, which the corresponding activation and deactivation MAC CE controls activation and deactivation, then the logical channel to the SCG RLC bearer, which the corresponding activation and deactivation MAC CE controls activation and deactivation. ID in ascending (or descending) order

In addition, according to an embodiment of the present disclosure, the primary RLC bearer is always activated and does not have a corresponding bit value, and the Ri field may correspond only to the secondary RLC bearer. If the UE receives the Ri bit for an RLC bearer that is not controlled by the base station sending the corresponding MAC CE, the corresponding Ri bit may be ignored. Also, referring to FIG. 7, the MAC CE may include a reserved bit 730, which is an unused bit for adjusting the size of a message in byte units (eg, a multiple of 8 bits). Of course, it is not limited to the above example. For example, the reserved bit 730 may include information other than Ri bits for activation and deactivation of the RLC bearer. Of course, it is not limited to the above example.

8 illustrates an operation of releasing a cell restriction for redundant packet transmission according to an embodiment of the present disclosure. As described above, for packet redundancy transmission, each RLC device or RLC bearer may have a list of cells that can be used, in other words, cell restriction. Due to cell restrictions, it is possible to prevent transmission of the same duplicate packet in the same cell at the same time through different RLC devices.

In the embodiment of FIG. 8, one radio bearer in which packet redundant transmission is set is shown, and three RLC devices 820, 821, and 822 are connected to one PDCP device 810 to use packet redundant transmission. Of course, it is not limited to the example of FIG. 8, and there is no limit to the number of RLC devices connected to one PDCP device. Also, referring to FIG. 8, RLC1 820 may use cell 1 830, RLC2 821 may use cell 2 831 and cell 3 832, and RLC3 822 may use cell 4 833 may be used. In addition, all cells of FIG. 8 may be set to the same cell group 841.

According to an embodiment of the present disclosure, when only one RLC bearer is activated in one cell group for a radio bearer in which packet redundancy transmission is configured, only one packet among duplicated packets may be transmitted in the corresponding cell group. In this case, even if the cell restriction is released, the duplicated packet may not be transmitted to the same cell at the same time. In the present invention, when only one RLC bearer (or RLC device) is activated in the same cell group among RLC bearers (or RLC devices) of a radio bearer in which packet redundancy transmission is configured, the limit of a cell that can be used can be released.

Referring to FIG. 8, only RLC3 822 is activated 853, and RLC1 820 and RLC2 821 are deactivated 850 and 851. That is, only one RLC bearer in the cell group 841 is activated (only RLC3 822 is activated). In this case, since the above-described cell restriction release condition is satisfied, the cell restriction may be released (860).

According to an embodiment of the present disclosure, when the cell restriction is released, the RLC device may not be restricted from the cell list that can be used. Referring to FIG. 8, all cells 830, 831, 832, and 833 in which RLC1 820, RLC2 821, and RLC3 822 are configured can be used (870) because the cell restriction is released.

Further, according to an embodiment of the present disclosure, when the cell restriction is released, RLC bearers for the same radio bearer may be used for the union cell of the cell list of the RLC bearer. In other words, when the cell limit is released, the usable cells of the RLC1 (820) Cell1 (830), the usable cells of the RLC2 (821) Cell2 (831), Cell3 (832), the usable cells of the RLC3 (822) Cell4 The union of (833), Cell1 (830), Cell2 (831), Cell3 (832), and Cell4 (833) can be used. If two or more RLC bearers are activated again afterwards, the original cell limitation can be applied.

9 shows a detailed process of releasing cell restriction of redundant packet transmission according to an embodiment of the present disclosure. If a radio bearer for which packet redundant transmission is configured is included in the connection configuration between the terminal and the base station, it is determined which RLC bearer to activate or packet redundant transmission is to be activated by a packet redundant transmission activation and deactivation message.

In step 910, the terminal may receive an RLC bearer activation or deactivation message for redundant packet transmission. In step 920, the terminal may activate or deactivate the RLC bearer or the RLC device based on the RLC bearer activation or deactivation message received in step 910.

In step 930, the UE may determine whether to release the cell restriction according to whether only one RLC bearer in the same cell group is activated for a radio bearer in which packet redundancy transmission is configured.

If only one RLC bearer is activated in the same cell group, in step 940, the UE may release the cell restriction of the RLC bearer of the cell group having one activated RLC bearer. At this time, cell restriction The RLC bearer that does not apply is an RLC bearer of a radio bearer in which a corresponding packet redundant transmission is configured and only one activated RLC bearer in a cell group is used.

If two or more RLC bearers are activated for a radio bearer for which packet redundancy transmission is configured, in step 950, the UE may perform packet redundant transmission by applying the originally configured cell limit.

10 is a diagram illustrating a structure of a terminal according to an embodiment of the present disclosure.

Referring to FIG. 10, the terminal may include a transceiver 1010, a control unit 1020, and a storage unit 1030. Of course, it is not limited to the above example, and the terminal may include more or fewer configurations than the configuration of FIG. 10. In addition, the transmission/reception unit 1010, the control unit 1020, and the storage unit 1030 may be implemented in the form of a single chip.

According to an embodiment of the present disclosure, the control unit 1020 may include a circuit or an application-specific integrated circuit, or at least one processor, and is not limited to the above example.

According to an embodiment of the present disclosure, the control unit 1020 may control a series of processes so that the terminal can operate according to the above-described embodiment. In an embodiment, the controller 1020 receives an RLC bearer activation control message for packet redundancy transmission, controls activation of at least one RLC bearer based on the received RLC bearer activation control message, and It may be determined whether only one RLC bearer among at least one RLC bearer corresponding to the group is activated, and whether to release the cell restriction of the cell group may be determined based on the determination result. The RLC bearer activation control message may include information for controlling activation and deactivation of the RLC bearer, and the RLC bearer activation control message may include information for controlling activation and deactivation of the packet redundant transmission function as described above. In relation to the above operation, only some operations of the above-described embodiments have been described as examples, but the present disclosure is not limited thereto, and the controller 1020 may control all processes so that the terminal may operate according to all or part of the above-described embodiments. The transmission/reception unit 1010 may transmit and receive signals with other network entities. The transceiver 1010 may receive system information from, for example, a base station, and may receive a synchronization signal or a reference signal. In addition, signals transmitted and received with the base station or network entity may include control information and data. To this end, the transmission/reception unit 1010 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. However, this is only an embodiment of the transmission/reception unit 1010, and components of the transmission/reception unit 1010 are not limited to the RF transmitter and the RF receiver. In addition, the transceiver 1010 may receive a signal through a wireless channel, output it to the control unit 1020, and transmit a signal output from the control unit 1020 through the wireless channel.

The storage unit 1030 may store at least one of information transmitted and received through the transmission/reception unit 1010 and information generated through the control unit 1020. The storage unit 1030 may store programs and data necessary for the operation of the terminal. Also, the storage unit 1030 may store control information or data included in a signal acquired from the terminal. The storage unit 1030 may be composed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, a DVD, or a combination of storage media. Also, the storage unit 1030 may be configured with a plurality of memories.

11 is a diagram illustrating a structure of a base station according to an embodiment of the present disclosure.

Referring to FIG. 11, the base station may include a transceiver 1110, a control unit 1120, and a storage unit 1130. Of course, it is not limited to the above example, and the base station may include more configurations or fewer configurations than the configuration of FIG. 10. In addition, the transmission/reception unit 1110, the control unit 1120, and the storage unit 1130 may be implemented in the form of a single chip.

According to an embodiment of the present disclosure, the control unit 1120 may include a circuit or an application-specific integrated circuit or at least one processor, and is not limited to the above example.

According to an embodiment of the present disclosure, the controller 1120 may control a series of processes so that the base station can operate according to the above-described embodiment. In an embodiment, the controller 1120 may transmit an RLC bearer activation control message for redundant transmission of the terminal. The RLC bearer activation control message may include information for controlling activation and deactivation of the RLC bearer, and the RLC bearer activation control message may include information for controlling activation and deactivation of the packet redundant transmission function as described above. In addition, the control unit 1120 may provide configuration information for activating a packet redundant transmission function to the terminal. In relation to the above operation, only some operations of the above-described embodiments have been described as examples, but the present invention is not limited thereto, and the controller 1120 may control all processes so that the base station can operate according to all or part of the above-described embodiments. . For example, the controller 1120 may perform all or some operations performed by the terminal, and may perform operations corresponding to the aforementioned operations of the terminal.

The transceiver 1110 may transmit and receive signals with other network entities. The transceiver 1110 may transmit system information to the terminal, for example, and may transmit a synchronization signal or a reference signal. In addition, signals transmitted and received with the terminal or network entity may include control information and data. To this end, the transceiver 1110 may include an RF transmitter that up-converts and amplifies a frequency of a transmitted signal, and an RF receiver that amplifies a received signal with low noise and down-converts a frequency. However, this is only an embodiment of the transmission/reception unit 1110, and components of the transmission/reception unit 1110 are not limited to the RF transmitter and the RF receiver. In addition, the transceiver 1110 may receive a signal through a wireless channel, output it to the control unit 1120, and transmit a signal output from the control unit 1120 through a wireless channel.

The storage unit 1130 may store at least one of information transmitted and received through the transmission/reception unit 1110 and information generated through the control unit 1120. The storage unit 1130 may store programs and data necessary for the operation of the base station. In addition, the storage unit 1130 may store control information or data included in a signal obtained from a network entity. The storage unit 1130 may be formed of a storage medium such as a ROM, a RAM, a hard disk, a CD-ROM, and a DVD, or a combination of storage media. Also, the storage unit 1130 may be configured with a plurality of memories.

12 illustrates an operation of transmitting PDCP configuration information of an SRB according to an embodiment of the present disclosure. A radio bearer in which data is transmitted in a radio access network (RAN), which means transmission between a base station and a terminal, can be divided into a signaling radio bearer (SRB) and a data radio bearer (DRB) through which control information is transmitted. In the radio bearers, redundant packet transmission may be configured for each radio bearer. However, in order to perform packet redundant transmission, two or more RLC devices must be configured on a corresponding radio bearer. Thereafter, in order to perform actual packet duplication, two or more RLC devices must be activated, so that it may be possible to transmit the same packet to two or more RLC devices in duplicate. As to which RLC device is to be activated, the base station may set the UE through an RRC Setup or Reconfiguration message. In order to perform packet redundant transmission, it may be necessary to set which RLC device is the primary RLC device. The primary RLC device may be an RLC device used to transmit a PDCP control PDU, an RLC device used when packet redundancy is disabled, or an RLC device that is always activated. The primary RLC can also be configured by the base station to the terminal through an RRC configuration or reconfiguration message. However, repeatedly setting the same information in such an RRC setup or reconfiguration message may cause unnecessary overhead, so packet duplication or split bearer setup for the first time, or the number of RLC devices set in the radio bearer has changed. Or, the base station may transmit the configuration information to the terminal only when the related configuration is changed.

In the embodiment of FIG. 12, when the base station transmits an RRC setup or reset message (or when it is determined or triggered to transmit an RRC setup or reset message) (step 1210), the base station sets or resets the RRC at the initial stage of the SRB. It is necessary to check at least one of whether the setting is included and the number of RLC devices of the SRB. If the information included in RRC configuration or reconfiguration is the initial setup of an SRB in which two or more RLC devices are configured or the number of RLC devices of the SRB is changed (step 1220), the base station must include the PDCP configuration in the SRB configuration Can be sent to (Step 1230) Only then can the setting of the primary RLC device by PDCP setting. In the case of packet redundant transmission, as well as in a split SRB having two or more RLC devices, it may be necessary to configure a PDCP device and a primary RLC.

If the SRB in which two or more RLC devices are configured is not initially configured and the number of SRB RLC devices is not changed, the base station can check whether other values or settings that can be included in the PDCP configuration should be changed (step 1240), and if changed. In this case, the PDCP configuration must be included in the SRB configuration and transmitted to the terminal. (Step 1230) If there is no need to change, the SRB setting may not include the PDCP setting. (Step 1250)

In the embodiment of FIG. 12, when the UE receives the RRC configuration or reconfiguration message (1210), it is necessary to check at least one of whether the RRC configuration or reconfiguration includes the initial configuration of the SRB and the number of RLC devices of the SRB. have. If the information included in RRC setting or reconfiguration is to initially set up an SRB in which two or more RLC devices are configured or to change the number of RLC devices in the SRB, the PDCP configuration must be included in the SRB configuration, and the UE must configure the PDCP configuration. It can be confirmed and applied. The PDCP configuration must be included in the SRB configuration to enable the configuration of the primary RLC device by the PDCP configuration. In the case of packet redundant transmission, as well as in a split SRB having two or more RLC devices, it may be necessary to configure the PDCP device and the primary RLC.

If the SRB in which two or more RLC devices are configured is not initially configured, and the number of SRB RLC devices is not changed, the UE can check whether other values or settings that can be included in the PDCP configuration should be changed, and if it should be changed, The PDCP configuration must be included in the SRB configuration, and the terminal may check the PDCP configuration and apply it. If there is no need to change, the PDCP configuration may not be included in the SRB configuration, and the terminal defaults to the PDCP configuration. ) The setting value can be applied.

13 illustrates an operation in which PDCP configuration information of an SRB is transmitted according to an embodiment of the present disclosure. A radio bearer in which data is transmitted in a radio access network (RAN), which means transmission between a base station and a terminal, can be divided into a signaling radio bearer (SRB) and a data radio bearer (DRB) through which control information is transmitted. , The radio bearers may be configured for packet redundancy transmission for each radio bearer. However, in order to perform packet redundancy transmission, two or more RLC devices must be configured for a corresponding radio bearer. Thereafter, in order to perform actual packet duplication, two or more RLC devices must be activated, so that it may be possible to duplicately transmit the same packet to two or more RLC devices. As to which RLC device is to be activated, the base station may configure the terminal through an RRC setup or reconfiguration message. In order to perform packet redundancy transmission, it may be necessary to set which RLC device is the primary RLC device. The primary RLC device may be an RLC device used to transmit a PDCP control PDU, an RLC device used when packet redundancy is disabled, or an RLC device that is always activated. The primary RLC configuration may also be configured by the base station to the terminal through an RRC configuration or reconfiguration message. However, repeatedly setting the same information in such an RRC setup or reconfiguration message may cause unnecessary overhead, so packet duplication or split bearer setup for the first time, or the number of RLC devices set in the radio bearer has changed. Or, the base station may transmit the corresponding configuration information to the terminal only when the related configuration is changed.

In the embodiment of FIG. 13, when the base station transmits an RRC setup or reset message (or when it is determined to transmit an RRC setup or reset message or is triggered) (step 1310), the base station sets or resets the RRC to split SRB or It is necessary to check at least one of whether CA (Carrier Aggregation) packet duplication includes the initial configuration of the configured SRB and the number of RLC devices of the SRB. If the information included in the RRC setting or reconfiguration is the initial setup of a split SRB or an SR SRB in which CA packet duplication is set, or the number of RLC devices of the SRB is changed (step 1320), the base station must include the PDCP configuration in the SRB configuration. Can be sent to the terminal. (Step 1330) Only then can the primary RLC device be set by PDCP setting.

In the case of packet redundancy transmission, as well as in a split SRB having two or more RLC devices, configuration of a PDCP device and configuration of a primary RLC may be required. Among SRBs in which packet redundancy is configured, an SRB in which DC (Dual Connectivity) packet redundancy is configured is classified as a split SRB, and thus an SRB in which DC packet redundancy is configured may also be included when considered in step 1320.

If the SRB with split SRB or CA packet redundancy is not set for the first time and the number of SRB RLC devices has not changed, the base station can check whether other values or settings that can be included in the PDCP configuration should be changed (step 1340). If necessary, the SRB configuration must include the PDCP configuration and can be transmitted to the terminal. (Step 1330) If there is no need to change, the SRB setting may not include the PDCP setting. (Step 1350)

In the embodiment of FIG. 13, when the UE receives an RRC configuration or reconfiguration message (1310), whether the RRC configuration or reconfiguration includes the initial configuration of the SRB in which the split SRB or CA (Carrier Aggregation) packet duplication is configured, and the corresponding It is necessary to check at least one of the number of RLC devices in the SRB. If the information included in the RRC setting or reconfiguration is to initially set up a split SRB or an SR SRB in which CA packet duplication is configured, or to change the number of RLC devices in the SRB, the PDCP configuration must be included in the SRB configuration, and the UE It can be applied by checking the PDCP setting. (Step 1330) The PDCP setting must be included in the SRB setting, so that the primary RLC device can be set by the PDCP setting.

In the case of packet redundant transmission, as well as in a split SRB having two or more RLC devices, it may be necessary to configure the PDCP device and the primary RLC. Among SRBs with packet redundancy configured, the SRB with DC (Dual Connectivity) packet redundancy configured is classified as a split SRB, so even in the case of an SRB with DC packet redundancy configured, the information included in RRC configuration or reconfiguration is a split SRB or CA packet. It can be determined whether the SR SRB in which the redundancy is set is initially set or the number of RLC devices of the SRB is changed. If the SRB with split SRB or CA packet redundancy is not initially configured and the number of SRB RLC devices is not changed, the UE can check whether other values or settings that can be included in the PDCP configuration should be changed, and if it should be changed In, the PDCP configuration must be included in the corresponding SRB configuration, and the UE must check and apply the PDCP configuration. If there is no need to change, the SRB configuration may not include the PDCP configuration, and in this case, the terminal may apply a default configuration value of the PDCP configuration.

14 illustrates an operation for transmitting PDCP configuration information of a DRB according to an embodiment of the present disclosure. A radio bearer in which data is transmitted in a radio access network (RAN), which means transmission between a base station and a terminal, can be divided into a signaling radio bearer (SRB) and a data radio bearer (DRB) through which control information is transmitted. In the radio bearers, redundant packet transmission may be configured for each radio bearer. However, in order to perform packet redundant transmission, two or more RLC devices must be configured on a corresponding radio bearer. Thereafter, in order to perform actual packet duplication, two or more RLC devices must be activated, so that it may be possible to transmit the same packet to two or more RLC devices in duplicate. As to which RLC device is to be activated, the base station may set the UE through an RRC Setup or Reconfiguration message. In order to perform packet redundant transmission, it may be necessary to set which RLC device is the primary RLC device. The primary RLC device may be an RLC device used to transmit a PDCP control PDU, an RLC device used when packet redundancy is disabled, or an RLC device that is always activated. The primary RLC can also be configured by the base station to the terminal through an RRC configuration or reconfiguration message. However, repeatedly setting the same information in such an RRC setup or reconfiguration message may cause unnecessary overhead, so packet duplication or split bearer setup for the first time, or the number of RLC devices set in the radio bearer has changed. Or, the base station may transmit the configuration information to the terminal only when the related configuration is changed.

In the embodiment of FIG. 14, when the base station transmits an RRC setup or reset message (or when it is determined or triggered to transmit an RRC setup or reset message) (step 1410), the base station initiates an RRC setup or reset. It is necessary to check at least one of whether to set or how many RLC devices are present. If the information included in the RRC configuration or reconfiguration is the initial setup of the DRB or the number of RLC devices of the DRB is changed (step 1420), the base station must include the PDCP configuration in the DRB configuration and transmit it to the terminal. (1430) Only then may it be possible to set the PDCP setting value including the setting of the primary RLC device by the PDCP setting.

If the DRB is not initially set and the number of RLC devices in the DRB is not changed, the base station can check whether other values or settings that can be included in the PDCP configuration need to be changed (step 1440). The PDCP configuration must be included and can be transmitted to the terminal. (Step 1430) If there is no need to change, the DRB setting may not include the PDCP setting. (1450)

In the embodiment of FIG. 14, when transmitting an RRC configuration or reconfiguration message (1410), the UE needs to check whether the RRC configuration or reconfiguration initially sets the DRB, and how many RLC devices are there. If the information included in the RRC setting or reconfiguration is the first setting of the DRB or changing the number of RLC devices in the DRB), the PDCP setting must be included in the setting of the corresponding DRB, and the UE can check and apply the PDCP setting. have. The PDCP configuration must be included in the DRB configuration to enable the configuration of the primary RLC device and the PDCP configuration value by the PDCP configuration.

If the DRB is not initially configured and the number of RLC devices of the DRB is not changed, the UE can check whether other values or settings that can be included in the PDCP configuration should be changed. If it is to be changed, the DRB configuration is the PDCP The configuration must be included, and the UE must check and apply the PDCP configuration.) Otherwise, the DRB configuration may not include the PDCP configuration, and the UE may maintain the previously configured DRB configuration value.

The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

When implemented in software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in a computer-readable storage medium are configured to be executable by one or more processors in an electronic device (device). The one or more programs include instructions that cause the electronic device to execute methods according to embodiments described in the claims or specification of the present disclosure.

These programs (software modules, software) include random access memory, non-volatile memory including flash memory, read only memory (ROM), and electrically erasable programmable ROM. (EEPROM: Electrically Erasable Programmable Read Only Memory), magnetic disc storage device, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other types of It may be stored in an optical storage device or a magnetic cassette. Alternatively, it may be stored in a memory composed of a combination of some or all of them. In addition, a plurality of configuration memories may be included.

In addition, the program is accessed through a communication network such as the Internet, Intranet, LAN (Local Area Network), WLAN (Wide LAN), or SAN (Storage Area Network), or a communication network composed of a combination thereof. It may be stored in an (access) attachable storage device. Such a storage device may access a device performing an embodiment of the present disclosure through an external port. In addition, a separate storage device on the communication network may access a device performing an embodiment of the present disclosure.

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

Meanwhile, although specific embodiments have been described in the detailed description of the present invention, various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention is limited to the described embodiments and should not be determined, and should be determined by the scope of the claims and equivalents as well as the scope of the claims to be described later. For example, parts of an embodiment of the present disclosure and another embodiment may be combined with each other to operate a base station and a terminal. Further, the embodiments of the present disclosure may be applied to other communication systems, and other modifications based on the technical idea of the embodiments may also be implemented.

Claims (1)

In a method for controlling packet redundant transmission of a terminal,
Receiving an RLC bearer activation control message for redundant packet transmission;
Controlling activation of at least one RLC bearer based on the received RLC bearer activation control message;
Determining whether only one RLC bearer among at least one RLC bearer corresponding to a predetermined cell group is activated; And
And determining whether to release the cell restriction of the cell group based on the determination result.

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