KR20210054959A - Method and apparatus for applying logical channel restriction in wireless communication system - Google Patents

Abstract

The present invention relates to a method for applying logical channel restriction in a wireless communication system and a device thereof. According to an embodiment of the present invention, a terminal identifies a resource set with an RNTI of a preset type, determines whether retransmission of a configured grant (CG) should be performed through a resource identified based on new data indicator (NDI) information, and performs retransmission of a CG about logical channels corresponding to a CG index set in the identified resource when CG retransmission needs to be performed.

Description

Method and apparatus for applying logical channel restriction in wireless communication system {METHOD AND APPARATUS FOR APPLYING LOGICAL CHANNEL RESTRICTION IN WIRELESS COMMUNICATION SYSTEM}

The present disclosure relates to applying a logical channel limitation in a wireless communication system, and more particularly, to a method and apparatus for applying a logical channel priority that can use resources to a logical channel that satisfies a specific condition.

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, the 60 giga (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, 5G communication systems include 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, evolved 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 5G systems, 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.

Meanwhile, the Internet is evolving from a human-centered connection network in which humans create 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, etc., is also emerging. In order to implement IoT, technological elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required. , 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 (5G communication system or New Radio (NR)) 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.

An object of the present disclosure is to provide a method and apparatus for managing a logical channel that can satisfy a predetermined requirement when transmitting a grant in a wireless communication system.

In a wireless communication system according to an embodiment, a method of applying a logical channel limitation by a terminal includes: identifying a resource set as an RNTI of a preset type; Determining whether to perform retransmission of a configured grant (CG) through the identified resource based on new data indicator (NDI) information; And performing retransmission of the CG for logical channels corresponding to the CG index set in the identified resource when retransmission of the CG is to be performed.

1 is a diagram illustrating a situation in which retransmission of a Configured Grant is set according to an embodiment.
FIG. 2 is a diagram illustrating an activation state of a second type Configured Grant according to an exemplary embodiment.
3 is a diagram for describing a method of applying a logical channel restriction according to an embodiment.
4 is a diagram for explaining a method of applying a logical channel restriction to a resource set as a CS-RNTI according to an embodiment.
5 is a diagram for explaining a method of applying a logical channel restriction to a resource set as a CS-RNTI according to another embodiment.
6 is a diagram for explaining a method of applying a logical channel restriction to a resource set as a CS-RNTI according to another embodiment.
7 is a diagram for explaining a terminal operation when retransmission resources set as CS-RNTI are allocated according to an embodiment.
FIG. 8 is a diagram for explaining a criterion for when to apply a list of a configured grant according to an embodiment.
9 is a diagram for describing a method of applying a logical channel restriction according to an embodiment.
10 is a diagram illustrating a structure of a base station according to an embodiment of the present disclosure.
11 is a diagram illustrating a structure of a terminal according to an embodiment of the present disclosure.
12 is a diagram for describing a method of applying a usable physical layer priority setting according to an embodiment of the present disclosure.

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

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 invention is not limited to the terms described below, and other terms referring to objects having an equivalent technical meaning may be used.

For convenience of description below, the present disclosure uses terms and names defined in the 3GPP 3rd Generation Partnership Project Long Term Evolution (LTE) standard. However, the present disclosure is not limited by the terms and names, and may be equally applied to systems conforming to other standards.

As a representative example of a broadband wireless communication system, the LTE system employs an Orthogonal Frequency Division Multiplexing (OFDM) scheme in downlink (DL) and Single Carrier Frequency Division Multiplexing (SC-FDMA) in uplink (UL) in the LTE system. ) Method is adopted. Uplink refers to a radio link through which a terminal (UE; User Equipment or MS; Mobile Station) transmits data or control signals to a base station (eNode B or BS; Base Station), and downlink means a base station transmits data or control to the terminal. It refers to a radio link that transmits a signal. The multiple access method as described above divides the data or control information of each user by assigning and operating time-frequency resources to carry data or control information for each user so that they do not overlap with each other, that is, orthogonality is established. .

As a future communication system after LTE, that is, a 5G communication system must be able to freely reflect various requirements such as users and service providers, services that simultaneously satisfy various requirements must be supported. Services considered for 5G communication systems include Enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC). There is this.

According to some embodiments, eMBB may aim to provide a more improved data transmission speed than the data transmission speed supported by the existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a maximum transmission rate of 20 Gbps in downlink and 10 Gbps in uplink from the viewpoint of one base station. In addition, the 5G communication system may be required to provide a maximum transmission rate and at the same time provide an increased user perceived data rate of the terminal. In order to satisfy such a requirement, in a 5G communication system, it may be required to improve various transmission/reception technologies including a more advanced multi-antenna (MIMO) transmission technology. In addition, signals are transmitted using a maximum 20MHz transmission bandwidth in the current 2GHz band used by LTE, whereas the 5G communication system uses a wider frequency bandwidth than 20MHz in a frequency band of 3~6GHz or 6GHz or higher. It can satisfy the data transmission speed.

At the same time, mMTC is being considered to support application services such as Internet of Things (IoT) in 5G communication systems. In order to efficiently provide the Internet of Things, mMTC may require large-scale terminal access support within a cell, improved terminal coverage, improved battery time, and reduced terminal cost. IoT is attached to various sensors and various devices to provide communication functions, so it must be able to support a large number of terminals (for example, 1,000,000 terminals/km2) within a cell. In addition, because the terminal supporting mMTC is highly likely to be located in a shaded area not covered by the cell, such as the basement of a building due to the nature of the service, a wider coverage may be required compared to other services provided by the 5G communication system. A terminal supporting mMTC must be configured as a low-cost terminal, and since it is difficult to frequently exchange the battery of the terminal, a very long battery life time such as 10 to 15 years may be required.

Finally, in the case of URLLC, as a cellular-based wireless communication service used for a specific purpose (mission-critical), remote control, industrial automation, and It can be used for services used for unmanned aerial vehicles, remote health care, emergency alerts, and the like. Therefore, the communication provided by URLLC may have to provide very low latency (ultra low latency) and very high reliability (ultra reliability). For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds, and at the same time may have a requirement of a packet error rate of 10-5 or less. Therefore, for a service that supports URLLC, a 5G system must provide a smaller Transmit Time Interval (TTI) than other services, and at the same time, it is designed to allocate a wide resource in the frequency band to secure the reliability of the communication link. Requirements may be required.

Three services considered in the aforementioned 5G communication system, that is, eMBB, URLLC, and mMTC, may be multiplexed and transmitted in one system. In this case, different transmission/reception techniques and transmission/reception parameters may be used between services in order to satisfy different requirements of each service. However, the aforementioned mMTC, URLLC, and eMBB are only examples of different service types, and the service types to which the present disclosure is applied are not limited to the above-described examples.

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

1 is a diagram illustrating a situation in which retransmission of a Configured Grant is set according to an embodiment.

When the UE performs uplink transmission, there are two methods of allocating uplink radio resources through which data is transmitted: Dynamic Grant (DG, dynamic grant) and Configured Grant (CG, configuration grant). According to the DG, radio resources may be allocated to the terminal through the DCI Format of the PDCCH (Physical Downlink Control Channel). At this time, the PDCCH resource is scrambled with a Radio Network Temporary Identifier (RNTI) and transmitted, and the RNTI may be classified into C-RNTI (Connected-RNTI), CS-RNTI (Configured Scheduling-RNTI), and the like, depending on the purpose. The resources allocated to C-RNTI can be used for initial transmission and retransmission for normal Dynamic Grant. The resource allocated to CS-RNTI may be a retransmission resource of Configured Grant, or may be used to indicate activation or deactivation of the second type Configured Grant. The second type of Configured Grant will be described later.

Configured Grant refers to a resource (100, 101, 102) that is repeated with a (120) constant period (110) on the time axis. Once the Configured Grant is set and activated, radio resources set until a separate deactivation or release point can be repeated. In the configured grant, there may be a first type (type 1) configured grant and a second type (type 2) configured grant. The first type of Configured Grant means a Configured Grant in which not only the cycle of the Configured Grant but also all resource settings are set by the RRC configuration message. The first type of Configured Grant does not have a separate activation and deactivation procedure, and can be activated when it is set in the Active BWP (Bandwidth Part), and can be deactivated when the setting is released. In the second type of Configured Grant, only some information such as period and CG Index are previously set by an RRC configuration message, and activation and deactivation may be indicated by DCI assigned to CS-RNTI.

When the Configured Grant is set, when the UE transmits to the Configured Grant resource, but the base station fails to receive or the UE does not transmit to the Configured Grant resource, but the base station wants to retransmit the Configured Grant resource, the base station uses the retransmission resource. Can be assigned. In the embodiment of FIG. 1, it is shown that the retransmission resource for the Configured Grant resource in step 101 is allocated and configured as CS-RNTI. (140) At this time, since the Configured Grant resource in step 101 and the retransmission resource in step 140 are set to the same HARQ process ID, the UE can confirm that the retransmission resource is a retransmission resource of the corresponding Configured Grant. Here, the resource allocated to the CS-RNTI can be classified as a dynamic grant because it is a one-time resource allocation for retransmission for a specific configured grant. However, since the resource classified as Dynamic Grant is a resource through which data to be transmitted to the Configured Grant can be transmitted, the included data may be data having the same QoS (Quality of Service) requirements as the data included in the Configured Grant. .

2 is a diagram for explaining an activation state of a second type Configured Grant according to an embodiment. When the UE performs uplink transmission, there are two methods of allocating uplink radio resources through which data is transmitted: Dynamic Grant (DG, dynamic grant) and Configured Grant (CG, configuration grant). According to the DG, radio resources may be allocated to the terminal through the DCI Format of the PDCCH (Physical Downlink Control Channel). At this time, the PDCCH resource is scrambled with a Radio Network Temporary Identifier (RNTI) and transmitted, and the RNTI may be classified into C-RNTI (Connected-RNTI), CS-RNTI (Configured Scheduling-RNTI), and the like, depending on the purpose. The resources allocated to C-RNTI can be used for initial transmission and retransmission for normal Dynamic Grant. The resource allocated to CS-RNTI may be a retransmission resource of Configured Grant, or may be used to indicate activation or deactivation of the second type Configured Grant.

Configured Grant refers to a resource (200, 201, 202) that is repeated with a constant period (210) in the time axis (220). Once the Configured Grant is set and activated, radio resources set until a separate deactivation or release point can be repeated. In the configured grant, there may be a first type (type 1) configured grant and a second type (type 2) configured grant. The first type of Configured Grant refers to a Configured Grant in which not only the cycle of the Configured Grant but also all resource settings are set by an RRC configuration message. The first type of Configured Grant does not have a separate activation and deactivation procedure, and can be activated when it is set in the Active BWP (Bandwidth Part), and can be deactivated when the setting is released. In the second type of Configured Grant, only some information such as period and CG Index are previously set by an RRC configuration message, and activation and deactivation may be indicated by DCI assigned to CS-RNTI.

When the second type of Configured Grant is configured, the base station may instruct activation of the Configured Grant in the DCI type transmitted to the CS-RNTI. In the embodiment of FIG. 2, up to the Configured Grant resource of step 200 is deactivated and not used, but by instructing the activation of the Configured grant to the CS-RNTI (240), the UE actually uses the resource from the Configured Grant resource of step 201. Indicates to perform the transfer. Thereafter, until deactivation or release is instructed, the terminal may perform data transmission in the corresponding Configured Grant resource. (201, 202) Here, the resource allocated to the CS-RNTI can be classified as a dynamic grant because it is a one-time resource allocation for activation of a specific configured grant. However, since the resource classified as Dynamic Grant is a resource through which data to be transmitted to the Configured Grant can be transmitted, the included data may be data having the same QoS (Quality of Service) requirements as the data included in the Configured Grant. .

3 is a diagram for describing a method of applying a logical channel limitation according to an embodiment.

In the 5G communication system, the logical channel 300 refers to a path connecting the RLC device 310 and the MAC device 320, and one logical channel may correspond to one RLC device. In uplink data transmission, radio resources that can be used for each logical channel may be limited. (330) The limitation of radio resources for a logical channel is to transmit data of a logical channel only for a specific resource in consideration of QoS requirements of data processed in the logical channel. For cell limitation of logical channels, one or more of the list of available Configured Grants, available subcarrier spacing, available cells, and whether the first type of Configured Grant can be used (ConfiguredGrantType1Allowed) is set. Can be. In the embodiment of FIG. 3, logical channel 1 can use a (300) CG Index of 1 and 3 configured grants, and the available resources are subcarrier spacing of 15 KHz and 30 KHz, and the cells that can be used are Cell 1 and Cell 2. And may be set to be able to use the first type Configured Grant. In this case, the UE can use the corresponding resource when all the set cell limits are satisfied. Meanwhile, FIG. 3 is for explaining an example in which logical channel restrictions are applied, and different logical channel settings may be applied to each logical channel, and in some logical channels, logical channel settings may not be applied. When creating a new MAC PDU (Medium Access Control Protocol Data Unit), these logical channel restrictions apply logical channel restrictions and only the logical channels that can use the resource participate in Logical Channel Prioritization to participate in the corresponding MAC It can be used to include data in the PDU.

4 is a diagram for explaining a method of applying a logical channel restriction to a resource set as a CS-RNTI according to an embodiment.

The UE may encounter a situation in which it is necessary to generate MAC PDUs for resources configured with CS-RNTI. (410) The situation in which the MAC PDU should be generated for the resource set as CS-RNTI may be at least one of a situation in which a Configured Grant is activated and a Configured Grant resource is used, or a retransmission of a Configured Grant occurs. In this case, which of the above-described situations corresponds to a new data indicator (NDI) value can be confirmed. (420) If the NDI value is set to 1, this may mean retransmission of Configured Grant. The UE needs to generate a new MAC PDU if there is no MAC PDU in the HARQ buffer when retransmission resources are allocated. When this MAC PDU is generated, the same logical channel limitation may be applied by considering the resource allocated to the corresponding CS-RNTI as a resource of the originally configured Configured Grant. (430) For example, if the retransmission resource allocated to the CS-RNTI is a retransmission resource of a Configured Grant that is set to CG Index = 1, it is regarded as a resource of the Configured Grant and is configured with a CG Index of 1 in the available Configured Grant list. Logical channel prioritization can be performed so that logical channels including grants can use the configured grant. However, this is only an embodiment, and according to another embodiment, when a MAC PDU is generated, a resource allocated as a CS-RNTI may be regarded as a resource of a Configured Grant in which a corresponding HARQ process is configured. For example, if a configured grant uses the HARQ process of HARQ process ID = 2, radio resources allocated to the CS-RNTI for HARQ process 2 may be regarded as the configured grant of HARQ process 2. In some embodiments, the same priority rule as the Configured Grant may be applied to an operation of determining a priority when two resources overlap by considering a resource set as a corresponding CS-RNTI as a Configured Grant resource. If the NDI is not 1, this means that the NDI has a value of 0, and that the NDI has a value of 0 may indicate activation or deactivation of the Configured Grant. If the NDI instructs the activation of the Configured Grant (440) when generating the MAC PDU, a logical channel restriction may be applied by considering the radio resource indicated by the activated resource as the Configured Grant resource. However, this is only an example, and in another embodiment, a radio resource indicated by an activated resource may be regarded as a resource of a Configured Grant in which a corresponding HARQ process is configured when a MAC PDU is generated. (450)

In the embodiment of FIG. 4, a list of Configured Grants that can be used for a resource to which a Configured Grant has been retransmitted may be applied. The UE may be allocated an uplink radio resource having an NDI value of 1 to an uplink resource allocated as CS-RNTI. In this case, it may mean that logical channels included in the Configured Grant that can be used by the Configured Grant ID corresponding to the allocated radio resource use the corresponding uplink radio resource. The meaning of using the corresponding uplink radio resource may mean that the logical channels participate in a logical channel prioritization process.

In addition, in the embodiment of FIG. 4, a list of available Configured Grants may be applied to resources for which the Configured Grant has been activated. The UE may be allocated an uplink radio resource having an NDI value of 0 for an uplink resource allocated as a CS-RNTI. In this case, it may mean that logical channels included in the Configured Grant in which the Configured Grant ID corresponding to the allocated radio resource can be used use the corresponding uplink radio resource. The meaning of using the corresponding uplink radio resource may mean that the logical channels participate in a logical channel prioritization process.

Accordingly, the list of usable Configured Grants that can be configured with each logical channel configuration may be configured including an uplink Configured Grant or a Configured Grant ID associated with a CS-RNTI configured uplink radio resource.

In some embodiments, the same priority rule as the Configured Grant may be applied to an operation of determining a priority when two resources overlap by considering a resource set as a corresponding CS-RNTI as a Configured Grant resource.

5 is a diagram for explaining a method of applying a logical channel restriction to a resource set as a CS-RNTI according to another embodiment. The UE may encounter a situation in which it is necessary to generate MAC PDUs for resources configured with CS-RNTI. (510) A situation in which a MAC PDU should be generated for a resource set as CS-RNTI may be at least one of a situation in which a Configured Grant is activated and a Configured Grant resource is used, or a retransmission of a Configured Grant occurs. In this case, which of the above-described situations corresponds to a new data indicator (NDI) value can be confirmed. (520) If the NDI value is set to 1, this may mean retransmission of Configured Grant. The UE needs to generate a new MAC PDU if there is no MAC PDU in the HARQ buffer when retransmission resources are allocated. When this MAC PDU is generated, it is regarded as having the same characteristics as the Configured Grant resource for initial transmission, and a logical channel restriction can be applied. (530) For example, if the retransmission resource allocated to the CS-RNTI is a retransmission resource of the Configured Grant set to CG Index = 1, it is considered as the initial transmission resource of the configured grant and the CG Index is 1 in the available Configured Grant list. A logical channel priority operation can be performed so that logical channels including the configured grant can use the corresponding configured grant. However, this is only one embodiment, and in another embodiment, the resource allocated to the CS-RNTI when the MAC PDU is generated may be regarded as the initial transmission resource of the Configured Grant in which the corresponding HARQ process is configured. For example, if a Configured Grant uses the HARQ process of HARQ process ID = 2, radio resources allocated to the CS-RNTI for HARQ process 2 may be regarded as initial transmission of the Configured Grant. In some embodiments, the same priority rule as the Configured Grant may be applied to an operation of determining a priority when two resources overlap by considering a resource set as a corresponding CS-RNTI as a Configured Grant resource. If the NDI is not 1, this means that the NDI has a value of 0, and that the NDI has a value of 0 may indicate activation or deactivation of the Configured Grant. If the NDI instructs to activate the Configured Grant (540), when generating the MAC PDU, a logical channel restriction may be applied by considering the radio resource indicated by the activated resource as the Configured Grant resource. However, this is only an example, and in another embodiment, a radio resource indicated by an activated resource may be regarded as a resource of a Configured Grant in which a corresponding HARQ process is configured when MAC PDU is generated. (550)

In the embodiment of FIG. 5, a list of Configured Grants that can be used for a resource for which a Configured Grant has been retransmitted may be applied. The UE may be allocated an uplink radio resource having an NDI value of 1 for an uplink resource allocated as CS-RNTI. In this case, it may mean that logical channels included in the Configured Grant in which the Configured Grant ID corresponding to the allocated radio resource can be used use the corresponding uplink radio resource. The meaning of using the corresponding uplink radio resource may mean that the logical channels participate in a logical channel prioritization process.

In addition, in the embodiment of FIG. 5, a list of available Configured Grants may be applied to resources for which the Configured Grant has been activated. The UE may be allocated an uplink radio resource having an NDI value of 0 for an uplink resource allocated as a CS-RNTI. In this case, it may mean that the logical channels included in the Configured Grant in which the Configured Grant ID corresponding to the allocated radio resource can be used use the corresponding uplink radio resource. The meaning of using the corresponding uplink radio resource may mean that the logical channels participate in a logical channel prioritization process.

Accordingly, the list of usable Configured Grants that can be configured with each logical channel configuration may be configured including an uplink Configured Grant or a Configured Grant ID associated with a CS-RNTI configured uplink radio resource.

In some embodiments, the same priority rule as the Configured Grant may be applied to an operation of determining a priority when two resources overlap by considering a resource set as a corresponding CS-RNTI as a Configured Grant resource.

6 is a diagram for explaining a method of applying a logical channel restriction to a resource set as a CS-RNTI according to another embodiment. The UE may encounter a situation in which it is necessary to generate MAC PDUs for resources configured with CS-RNTI. (610) The situation in which the MAC PDU should be generated for the resource set as CS-RNTI may be at least one of a situation in which a Configured Grant is activated and a Configured Grant resource must be used, or a retransmission of a Configured Grant occurs. At this time, which of the above-described situations corresponds to a new data indicator (NDI) value can be checked. (620) If the NDI value is set to 1, this may mean retransmission of Configured Grant. The UE needs to generate a new MAC PDU if there is no MAC PDU in the HARQ buffer when retransmission resources are allocated. When this MAC PDU is generated, it is considered to have the resource characteristics of the originally configured Configured Grant resource, and a logical channel restriction can be applied. (630) For example, if the retransmission resource allocated to the CS-RNTI is a retransmission resource of the Configured Grant set to CG Index = 1, and the Configured Grant resource has a subcarrier spacing of 15 KHz, the retransmission resource allocated to the CS-RNTI is A logical channel that includes a Configured Grant with a CG Index of 1 in the list of available Configured Grants as a Configured Grant resource with a CG Index of 1 and a resource with subcarrier spacing of 15KHz and includes 15KHz in the available subcarrier spacing. Logical channel prioritization can be performed so that they can use the Configured Grant. However, this is only an embodiment, and in another embodiment, when the MAC PDU is generated, the resource allocated to the CS-RNTI may be regarded as having the same characteristics as the initial transmission resource of the Configured Grant in which the corresponding HARQ process is configured. In some embodiments, the same priority rule as the Configured Grant may be applied to an operation of determining a priority when two resources overlap by considering a resource set as a corresponding CS-RNTI as a Configured Grant resource. If the NDI is not 1, this means that the NDI has a value of 0, and that the NDI has a value of 0 may indicate activation or deactivation of the Configured Grant. If the NDI instructs the activation of the Configured Grant (640), when generating the MAC PDU, a logical channel restriction may be applied by considering the radio resource indicated by the activated resource as the Configured Grant resource. However, this is only an example, and in another embodiment, a radio resource indicated by an activated resource may be regarded as a resource of a Configured Grant in which a corresponding HARQ process is configured when MAC PDU is generated. (650)

In the embodiment of FIG. 6, a list of Configured Grants that can be used for resources for which the Configured Grant has been retransmitted may be applied. The UE may be allocated an uplink radio resource having an NDI value of 1 for an uplink resource allocated as CS-RNTI. In this case, it may mean that logical channels included in the Configured Grant in which the Configured Grant ID corresponding to the allocated radio resource can be used use the corresponding uplink radio resource. The meaning of using the corresponding uplink radio resource may mean that the logical channels participate in a logical channel prioritization process.

In addition, in the embodiment of FIG. 6, a list of available Configured Grants may be applied to resources for which the Configured Grant has been activated. The UE may be assigned an uplink radio resource having an NDI value of 0 to an uplink resource allocated as a CS-RNTI. In this case, it may mean that the logical channels included in the Configured Grant in which the Configured Grant ID corresponding to the allocated radio resource can be used use the corresponding uplink radio resource. The meaning of using the corresponding uplink radio resource may mean that the logical channels participate in a logical channel prioritization process.

Accordingly, the list of usable Configured Grants that can be configured with each logical channel configuration may be configured including an uplink Configured Grant or a Configured Grant ID associated with a CS-RNTI configured uplink radio resource.

In some embodiments, the same priority rule as the Configured Grant may be applied to an operation of determining a priority when two resources overlap by considering a resource set as a corresponding CS-RNTI as a Configured Grant resource.

7 is a diagram for explaining a terminal operation when retransmission resources set as CS-RNTI are allocated according to an embodiment.

If the UE is assigned a resource with CS-RNTI and the NDI value is set to 1 at this time (710), the UE may determine the corresponding resource as a retransmission resource of the Configured Grant. At this time, it may have been determined that the initial transmission of the Configured Grant for the corresponding HARQ process has a low priority. If the MAC PDU to be initially transmitted to the configured grant is found to have a low priority and cannot be transmitted, and the HARQ buffer of the corresponding HARQ process is emptied (720), the terminal is Transfer can be performed. The terminal can check whether the NDI is toggled to confirm that it is a new transmission.At this time, if it is considered that the NDI is toggled (e.g., if NDI = 1, it is considered that the NDI is toggled), the corresponding CS -The logical channel restriction can be applied by considering the resource set as RNTI as the Configured Grant resource. (730) In some embodiments, the same priority rule as the Configured Grant may be applied to an operation of determining a priority when two resources overlap by considering a resource set as a corresponding CS-RNTI as a Configured Grant resource.

FIG. 8 is a diagram for explaining a criterion for when to apply a list of a configured grant according to an embodiment.

The logical channel restriction on whether the terminal uses the Configured Grant may be set by ConfiguredGrantType1Allowed indicating whether to use the Configured Grant of the first type, or may be set by a list of available Configured Grants. However, the two criteria need not be applied at the same time.

Therefore, when the first type of Configured Grant is configured (810), the terminal needs to determine which logical channel limit to set. According to the embodiment of FIG. 8, the terminal may determine which logical channel limit to set according to whether or not the CG Index is set. (820) If the CG Index is not configured as a configured grant, only one configured grant of this first type may be configured. At this time, since the list of Configured Grants is not required, the resource of the Configured Grant may be allocated to a logical channel set to use the first type Configured Grant (ConfiguredGrantType1Allowed=True). (830) According to another example, if the CG Index is a configured Grant, a plurality of Configured Grants of the first type may be configured, and the CG Index may be an identifier of each Configured Grant. In this case, the logical channel that allows the use of the Configured Grant can use the resources of the Configured Grant. In other words, among the list of available Configured Grants, the logical channel that contains the Configured Grant can use the Configured Grant.

9 is a diagram for explaining a method of applying a logical channel restriction according to an embodiment.

In the 5G communication system according to an embodiment, the logical channel 900 refers to a path connecting the RLC device 910 and the MAC device 920, and one logical channel may correspond to one RLC device. In uplink data transmission, each logical channel may have a limit on radio resources that can be used. (930) The reason that the radio resources usable in each logical channel is limited is to transmit data only for specific resources in consideration of the QoS requirements of data processed in the logical channel. The cell limit of the logical channel includes a list of available Configured Grants, available subcarrier spacing, available cells, whether the first type of Configured Grant can be used (ConfiguredGrantType1Allowed), and whether Dynamic Grant can be used. One or more of whether (DynamicGrantAllowed), a list of DCI types that can be used, and a physical layer priority resource that can be used may be set. In the embodiment of FIG. 9, logical channel 1 can use a (900) CG Index of 1, 3 Configured Grant, and the available resources are subcarrier spacing of 15 KHz and 30 KHz, and the available cells are Cell 1 and Cell 2. And, whether or not the first type Configured Grant can be used is possible, and whether or not a dynamic grant resource can be used is possible, and the list of available DCI types is DCI types 1, 2, 3, and the available physical layer priority It is assumed that the rank is set to high. In this case, the UE can use the corresponding resource when all the set cell limits are satisfied. The embodiment of FIG. 9 shows an example in which logical channel restrictions are applied. Different logical channel settings may be applied to each logical channel, and logical channel settings may not be applied to some logical channels. When creating a new MAC PDU (Medium Access Control Protocol Data Unit), these logical channel restrictions apply logical channel restrictions and only the logical channels that can use the resource participate in Logical Channel Prioritization to participate in the corresponding MAC It is possible to include data in the PDU.

Among them, whether or not the dynamic grant can be used may be set with a 1-bit indicator, and when the corresponding field is set, it may mean that the resource set with the dynamic grant can be used. Depending on the embodiment, the content may be applied as whether or not the Dynamic Grant resource cannot be used. The list of DCIs that can be used limits logical channels according to the DCI format, which means that the logical channel can use resources only for resources set in a specific DCI format. The physical layer priority resource may be determined based on a value of the DCI field or the physical layer priority when the physical layer priority is classified into a group of a specific DCI field. For example, a resource set in DCI formats 1 and 2 may be determined to have a high physical layer priority, and a resource set in another DCI format may be determined to have a low physical layer priority.

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

Referring to FIG. 10, the base station may include a transmission/reception unit 1010, a control unit 1020, and a storage unit 1030. In the present disclosure, the controller 1020 may be defined as a circuit or an application-specific integrated circuit or at least one processor.

The transceiving unit 1010 may transmit and receive signals with other network entities. The transmission/reception unit 1010 may transmit system information to the terminal, for example, and may transmit a synchronization signal or a reference signal.

The controller 1020 may control the overall operation of the base station according to the embodiment proposed in the present disclosure. For example, the controller 1020 may control a signal flow between blocks to perform an operation according to the above-described flowchart. 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.

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

Referring to FIG. 11, the terminal may include a transmission/reception unit 1110, a control unit 1120, and a storage unit 1130. In the present disclosure, the control unit may be defined as a circuit or an application-specific integrated circuit or at least one processor.

The transceiver 1110 may transmit and receive signals with other network entities. The transceiver 1110 may receive system information from, for example, a base station, and may receive a synchronization signal or a reference signal.

The controller 1120 may control the overall operation of the terminal according to the embodiment proposed in the present disclosure. For example, the controller 1120 may control a signal flow between blocks to perform an operation according to the above-described flowchart.

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.

12 is a diagram for describing a method of applying a usable physical layer priority setting according to an embodiment of the present disclosure.

The base station may set a physical layer priority for each uplink radio resource in order to determine which uplink radio resource to select and transmit when overlapping uplink radio resources occur in the time axis or the time axis and the frequency axis. This physical layer priority may be set in the DCI field transmitted through the PDCCH channel.

In step 1210, the terminal may be allocated an uplink radio resource for which a specific physical layer priority is set. In this case, the MAC device of the terminal may determine which logical channel data to be transmitted by including it in the corresponding uplink radio resource. To this end, the terminal may set a physical layer priority that can be used for each logical channel configuration. Based on this, in the logical channel prioritization process, each logical channel may transmit data including data only in uplink radio resources of the allowed physical layer priority.

The priority of the physical layer can be set in both the Configured Grant and Dynamic Grant, but the Dynamic Grant assigned to the Configured Grant and CS-RNTI can know which logical channel data to include from the available Configured Grant list. , Physical layer priority setting that can be used only for C-RNTI and MCS-RNTI resources that are not, can be applied.

In step 1220, when the UE is allocated an uplink radio resource, it may be determined whether the resource is allocated as a C-RNTI or MCS-C-RNTI. In step 1230, when the allocated radio resource is a resource allocated as C-RNTI or MCS-C-RNTI, this resource may be a resource to which usable physical layer priority is applied.

In step 1230, based on the available physical layer priority, only the logical channel including the physical layer priority of the corresponding uplink radio resource is selected, and the selected logical channel can participate in the logical channel prioritization process.

In step 1240, if the UE is allocated an uplink radio resource and is not a resource allocated as C-RNTI or MCS-C-RNTI, the resource is a Configured Grant resource or a retransmission resource of a Configured Grant allocated as CS-RNTI. Or, because it is an active resource (the first type 2 Configured Grant resource), there is no need to apply the available physical layer priority in this case. Therefore, the available physical layer priority setting may not be applied.

Therefore, the available physical layer priorities that can be set by each logical channel configuration can be set including a physical layer priority index associated with an uplink radio resource set by C-RNTI or MCS-C-RNTI among uplink radio resources. There will be.

The methods according to the embodiments described in the claims or the 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 for causing 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 through a communication network composed of a communication network such as the Internet, an intranet, a local area network (LAN), a wide LAN (WLAN), or a storage area network (SAN), or a combination thereof. It may be stored in an accessible 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 specific embodiments of the present disclosure described above, the constituent elements included in the invention are expressed in the singular or plural according to the presented specific embodiment. However, the singular or plural expression is selected appropriately for the situation presented for convenience of description, and the present disclosure is not limited to the singular or plural constituent elements, and even constituent elements expressed in plural are composed of the singular or in the singular. Even the expressed constituent elements may be composed of pluralities.

Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, various modifications may be made without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure is limited to the described embodiments and should not be defined, and should be determined by the scope of the claims and equivalents as well as the scope of the claims to be described later.

Claims (1)

In a wireless communication system, in a method for a terminal to apply a logical channel restriction,
Identifying a resource set as an RNTI of a preset type;
Determining whether to perform retransmission of a configured grant (CG) through the identified resource based on new data indicator (NDI) information; And
If the retransmission of the CG is to be performed, performing retransmission of the CG for logical channels corresponding to the CG index set in the identified resource.

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