KR20180136855A - Method and apparatus for a uplink transmission based on a characteristics of physical resources - Google Patents

Abstract

The present disclosure relates to a 5G or a pre-5G communication system to support a higher data transmission rate than that of a 4G communication system like LTE. According to an embodiment of the present invention, a method of a terminal in a wireless communication system comprises the steps of: receiving mapping information between profile information of an uplink grant and a logic channel from a base station; receiving the uplink grant from the base station; and transmitting data to the base station based on the received mapping information and the profile information of the uplink grant.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method and apparatus for transmitting uplink data,

The present invention relates to a wireless communication system, and more particularly, to a multiplexing method and apparatus for efficiently performing uplink (UL) transmission when a terminal is using a plurality of services.

More specifically, in the present invention, uplink signals having specific physical characteristics (numerology, transmission time interval (TTI) length, modulation and coding scheme (MCS), or power control command) When a UL Grant is assigned to a UE, the UE determines which service or logical channel data to transmit, forms a packet to be transmitted, and transmits the packet.

Efforts are underway to develop an improved 5G or pre-5G communication system to meet the growing demand for wireless data traffic after commercialization of the 4G communication system. For this reason, a 5G communication system or a pre-5G communication system is referred to as a 4G network (Beyond 4G Network) communication system or a post-LTE system (Post LTE) system.

To achieve a high data rate, 5G communication systems are being considered for implementation in very high frequency (mmWave) bands (e.g., 60 gigahertz (60GHz) bands). In order to mitigate the path loss of the radio wave in the very high frequency band and to increase the propagation distance of the radio wave, in the 5G communication system, beamforming, massive MIMO, full-dimension MIMO (FD-MIMO ), Array antennas, analog beam-forming, and large scale antenna technologies are being discussed.

In order to improve the network of the system, the 5G communication system has developed an advanced small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, (D2D), a wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation Have been developed.

In addition, in the 5G system, the Advanced Coding Modulation (ACM) scheme, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), the advanced connection technology, Filter Bank Multi Carrier (FBMC) (non-orthogonal multiple access), and SCMA (sparse code multiple access).

Meanwhile, the UE can allocate uplink resources from the base station and transmit data through the uplink resources. However, when the terminal is using a service having different requirements, there is no specific information about which service to transmit data to. Therefore, there is a need for a method for determining which service is to be transmitted through the uplink resources by a terminal using a plurality of services.

When a terminal uses a plurality of services requiring different qualities, when a UL resource having a specific physical property is allocated from a base station, it is necessary to determine which service or data belonging to a logical channel is to be transmitted through the allocated UL resource. In the present invention, the operation of the terminal and the base station for making such a determination is proposed.

According to another aspect of the present invention, there is provided a method of a mobile station for receiving mapping information between a logical channel and profile information of an uplink grant from a base station, receiving an uplink grant from the base station, And transmitting data to the base station based on the profile information of the grant and the mapping information.

According to another aspect of the present invention, there is provided a method of a base station including: transmitting mapping information between a logical channel and profile information of an uplink grant to a terminal; transmitting an uplink grant to the terminal; And receiving the selected data based on the profile information of the UL grant and the mapping information.

In order to solve the above-mentioned problems, the terminal of the present invention receives mapping information between a logical channel and profile information of an uplink grant from a base transceiver station for transmitting and receiving signals, receives profile information of an uplink grant from the base station, receives an uplink grant from the base station And a controller for transmitting data to the base station based on the received uplink grant profile information and the mapping information.

According to another aspect of the present invention, there is provided a base station for transmitting mapping information between a logical channel and an uplink grant profile information to a transceiving unit for transmitting and receiving signals and an MS, and transmitting an uplink grant to the MS And a controller for receiving data selected based on the uplink grant profile information and the mapping information.

According to an embodiment of the present invention, when a UL resource having a specific physical property is allocated to a terminal using a plurality of services, the terminal selects data most suitable for the service or the logical channel to form a packet to be transmitted, Can be performed. This can more effectively satisfy the requirements or quality of the service used by the terminal.

1 is a diagram illustrating an example of an LCP-based UL resource utilization method.
FIG. 2A is a diagram illustrating an example of a situation where a BS allocates UL grants in which different MCSs are specified when a specific CQI is received feedback from the UE.
FIG. 2B is a diagram illustrating an operation of a terminal according to an exemplary embodiment of the present invention.
2C is a diagram illustrating an operation of a base station according to an embodiment of the present invention.
3A is a diagram illustrating an example of a situation in which a base station assigns UL grants in which different TPC commands are specified when a specific CQI and a PHR are received feedback from the terminal according to an embodiment of the present invention.
3B is a diagram illustrating an operation of a terminal according to an embodiment of the present invention.
3C is a diagram illustrating an operation of a base station according to an embodiment of the present invention.
4 is a diagram illustrating a method of directly informing a profile ID when a BS allocates an UL grant to a UE according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating a case where a base station assigns a UL grant to a UE according to an embodiment of the present invention, rather than directly informing a profile ID of the UL grant, a parameter directly or indirectly detected by the UE through an UL grant or other signaling, FIG. 8 is a diagram illustrating a method for deriving a profile ID by comparing the correspondence relationship between the ID and the parameter. FIG.
6 is a diagram illustrating the amount of data belonging to each LCH and Bj of each LCH j according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating the correspondence between two kinds of UL grant and UL grant and LCH allocated to a UE by a BS according to an embodiment of the present invention.
8 is a diagram illustrating an example of processing an UL grant X first according to an embodiment of the present invention and then processing an UL grant Y. FIG.
9 is a diagram illustrating an example of processing an UL grant Y first according to an embodiment of the present invention and then processing an UL grant X. FIG.
11 is a diagram illustrating a HARQ time relationship according to an embodiment of the present invention.
12 is a diagram illustrating time between various UL grant reception time and data transmission time according to an embodiment of the present invention.
13 is a diagram illustrating time between various UL grant reception time points and ACK / NACK reception time points according to an embodiment of the present invention.
FIG. 14 illustrates time between various data transmission time points and ACK / NACK reception time points according to an embodiment of the present invention. Referring to FIG.
FIG. 15 is a diagram illustrating UL grants and UL transmission timings allocated in various TTI types according to an embodiment of the present invention. Referring to FIG.
16 is a diagram illustrating a case where UL resources having different TTIs are allocated through UL grants transmitted through a specific TTI according to an embodiment of the present invention.
17 is a diagram illustrating a case where UL resources having a plurality of different TTIs are allocated through a PDCCH transmitted in one TTI according to an embodiment of the present invention.
18 is a diagram illustrating an example in which a plurality of bandwidth parts in one component carrier according to an exemplary embodiment of the present invention operates resources composed of different TTIs.
19A to 19C are diagrams illustrating an example in which UL resources having different TTI lengths are allocated at different PDCCH monitoring points according to an embodiment of the present invention.
20 is a diagram illustrating an example in which UL resources having different TTI lengths are allocated in different PDCCH monitoring time and frequency resources according to an embodiment of the present invention.
FIG. 21 is a diagram illustrating another example in which UL resources having different TTI lengths are allocated in different PDCCH monitoring time and frequency resources according to an embodiment of the present invention.
22 is a diagram illustrating an example in which different PDCCH monitoring time and frequency resources are set in different bandwidth parts according to an embodiment of the present invention.
23 is a view for explaining a method of determining a physical characteristic of the UL grant after the UE receives an UL grant and then selecting an LCH that can be transmitted through the allocated UL grant according to an embodiment of the present invention.
24 is a diagram illustrating a method of selecting an LCH that can be transmitted through an UL grant after a terminal receives an UL grant according to an embodiment of the present invention.
25 is a diagram illustrating a method for transmitting uplink data according to an embodiment of the present invention.
26 is a diagram illustrating another method of transmitting uplink data according to an embodiment of the present invention.
FIG. 27 is a diagram illustrating another method of transmitting uplink data according to an embodiment of the present invention. Referring to FIG.
28 is a diagram illustrating another method of transmitting uplink data according to an embodiment of the present invention.
29 is a diagram illustrating a structure of a terminal according to an embodiment of the present invention.
30 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

The present invention proposes a logical channel prioritization (LCP) operation for UL transmission in a mobile communication system.

In the 5G mobile communication system, various services (or slices) such as enhanced Mobile BroadBand (eMBB), Ultra Reliable and Low Latency Communication (URLLC) and enhanced Machine Type Communication (eMTC) are expected to be supported. This can be understood in the same context as that the Voice over Internet Protocol (VoIP) and BE (Best Effort) services are supported in LTE, which is a 4G mobile communication system. In addition, various numerology is expected to be supported in 5G mobile communication system. This means specifically subcarrier spacing.

In addition, TTIs of various lengths are expected to be supported in the 5G mobile communication system. This is one of the characteristics of the 5G mobile communication system, which is very different from that of the standardized LTE so far, in which only one kind of TTI (1 ms) is supported. If the 5G mobile communication system supports a TTI (for example, 0.1 ms) which is much shorter than the 1 ms TTI of LTE, it is expected to be a great help in supporting URLLC which requires a short delay time.

The present invention proposes a UL scheduling method considering characteristics of the 5G mobile communication system, that is, various services, various numerology and TTI support. The difference from the UL scheduling method defined in the LTE is that the present invention provides a scheduling method for supporting various services using various numerology or TTIs as long as it was a scheduling method for supporting various services in the past.

The LCP method for explaining the present invention will be described. In the present invention, LCP (Logical Channel Prioritization) during UL scheduling will be described.

In the case of downlink scheduling (DL scheduling), the entity that generates and transmits downlink traffic (DL traffic) is a base station and the subject performing DL scheduling is also a base station. That is, the base station can perform DL scheduling and transmit the generated DL traffic. However, in the case of UL scheduling, the entity that generates and transmits the UL traffic is the UE, but the subject performing the UL scheduling is the base station. Therefore, the BS allocates resources of a certain size to the UE through UL scheduling, and the UE allocates the UL traffic generated by the UE to the resources, and transmits the UL traffic to the BS. Here, the method of "assigning the UL traffic generated by the terminal to the resource allocated by the terminal" is referred to as LCP. Specifically, the process may include determining the type and size of traffic to be transmitted to resources allocated to the MS. An example of this is shown in FIG.

1 is a diagram illustrating an example of an LCP-based UL resource utilization method.

The UL traffic generated in the terminal corresponds to a logical channel according to the service type and the like. As an example, each logical channel or group of logical channels can correspond to each service. Each logical channel has priority according to the setting of the base station.

Referring to FIG. 1, logical channels 1, 2, and 3 have priority levels 1, 2, and 3, respectively. A method for allocating UL traffic to a corresponding resource when a terminal receives a resource from a base station is as follows.

The terminal basically allocates data of PBR (Prioritized Bit Rate) in order of logical channels having higher priority. Here, the PBR of each logical channel is set by the base station through RRC signaling.

Then, the UE repeatedly allocates the remaining UL traffic in order of the logical channels having the highest priority until the resources allocated to the UL traffic are exhausted. Through this, UL traffic belonging to various logical channels can be multiplexed.

Therefore, the first embodiment proposed in the present invention is as follows.

In LTE, the base station informs the terminal of the MCS information when allocating resources to the UE through the UL grant. This information is indispensable information when the UE generates a physical layer packet (PHY packet) through modulation and coding operations. However, the UE performs the operation of generating a PHY packet for the given data based on the MCS information, but does not determine which service, that is, data belonging to an LCH, is to be transmitted through the allocated UL grant. In the first embodiment of the present invention, a method for determining whether or not a UE transmits data belonging to an LCH through an UL grant through MCS information is proposed.

FIG. 2A is a diagram illustrating an example of a situation where a BS allocates UL grants in which different MCSs are specified when a specific CQI is received feedback from the MS.

The UE may feedback the CQI in step S210. It is assumed that the UE feedbacks the CQI corresponding to the MCS level 10 to the base station in the CQI feedback.

At this time, the following cases can be considered.

Case A: In step S220, the BS can instruct the MS to use the MCS level 10 in the UL grant based on the CQI feedback information of the UE.

Case B: The BS may instruct the MS to use the MCS level 5 when allocating the UL grant to the UE in step S240 based on the CQI feedback information of the UE.

In general, a UE feedbacks a highest CQI among CQIs that can satisfy a target error rate given a channel gain between a Node B and a UE.

Therefore, in case A, the UE receives the UL grant specified to use the MCS level 10 (S220), and performs the transmission based on the UL grant (S230). In this case, the highest throughput satisfies the given target error rate Can be obtained. The base station can determine that the MCS level is set to 10 in order to obtain the highest throughput while satisfying the target error rate.

Next, in step S240, the UE receives an UL grant specified to use the MCS level 5 in step S240. If the UE performs transmission in step S250 based on the UL grant, the target error rate is less than a target error rate. It is possible to achieve lower throughput than case A while satisfying a low error rate. This is because a trade-off relationship exists between the error rate and throughput when the channel gain between the base station and the terminal is given.

Therefore, even though the UE feedbacks the CQI corresponding to the MCS level 10, the BS allocates the UL grant explicitly designated to use the MCS level 5 to the UE, which means that the UE intends to transmit data requiring a low error rate have. Alternatively, the allocation of the UL grant by the base station to use the MCS level 5 for the terminal may have been intended to satisfy a given target error rate due to the degradation of the channel gain.

However, the terminal can not distinguish case A from case B as described above. That is, when the UE feedbacks the CQI corresponding to the MCS level 10 and is assigned an explicit UL grant to use the MCS level 5 from the base station, the base station observes or predicts a decrease in channel gain to satisfy a given target error rate (B) MCS level 10 can be used to meet the target error rate, but the MCS level is intentionally lowered from 10 to 5 to meet the lower target error rate I can not tell.

It is assumed that both the eMBB traffic requesting high throughput and the URLLC traffic requesting high reliability or a low error rate exist in the buffer of the UE. The UE can transmit eMBB traffic or URLLC traffic to the allocated TTI based on the TTI length and the subcarrier spacing value. At this time, if the UE can grasp the MCS setting intention of the base station described above, it can transmit data considering the MCS setting intention to the length of the TTI or the subcarrier spacing value. Specifically, the terminal can perform the following operations.

- If the BS allocates an UL grant with a lower MCS level than the CQI feedback of the MS and is assigned an UL grant with a lower MCS level for a lower target error rate, and transmits URLLC traffic requiring high reliability or low error rate among the traffic.

On the other hand, if the BS allocates an UL grant specifying a similar MCS level to the CQI feedback of the UE and the UL grant is allocated for high throughput, the UE requests a high throughput of the traffic existing in the buffer through the allocated UL grant eMBB traffic is transmitted.

If the UE can grasp the MCS establishment intention of the BS, it can determine which LCH belongs to when the UE receives the UL grant. That is, the UE selects the LCH that best matches the characteristics of the allocated UL grant and allocates data to improve the service quality.

To this end, the present invention proposes a method of adding a 1-bit indicator indicating an MCS setting intention when a base station assigns an UL grant to a terminal. In the present invention, the 1-bit indicator is referred to as a conservative MCS. However, the embodiment of the present invention is not limited to this, and other terms used to designate the MCS can be used. An example of this is as follows.

If Conservative MCS = 1, the UL grant and MCS allocated by the base station may be meant for traffic transmission requiring a low error rate.

If Conservative MCS = 0, then the UL grant and MCS allocated by the base station may be meant for traffic transmission requiring high throughput.

- Table 1 below shows an example of adding 1 bit of conservative MCS item to the UL grant of LTE.

[Table 1]

More specifically, the operation of the terminal will be described with reference to FIG. FIG. 2B is a diagram illustrating an operation of a terminal according to an exemplary embodiment of the present invention.

(1) The terminal can receive the LCH list in step S260. The UE can receive the LCH list corresponding to the conservative MCS = 1 and the conservative MCS = 0 from the base station. The UE can receive the LCH list corresponding to each conservative MCS through the RRC IE such as the LogicalChannelConfig IE.

(2) The UE can receive the UL grant in step S261. After receiving the UL grant, the terminal checks the conservative MCS entry in the UL grant.

A. When Conservative MCS = 1, the UE selects the LCH corresponding to the conservative MCS = 1 according to the correspondence between the conservative MCS and the LCH provided by the base station, and performs the LCP operation on the selected LCH.

B. When Conservative MCS = 0, the UE selects the LCH corresponding to the conservative MCS = 0 according to the correspondence between the conservative MCS and the LCH provided by the base station, and performs the LCP operation on the selected LCH.

(3) The UE performs the LCP operation in step S262 and then performs the UL transmission.

2C is a diagram illustrating an operation of a base station according to an embodiment of the present invention.

(1) In step S270, the BS can provide the MS with an LCH list corresponding to conservative MCS = 1 and conservative MCS = 0. The BS can provide the MS with the LCH list corresponding to each conservative MCS through the RRC IE such as the LogicalChannelConfig IE.

(2) The base station can transmit UL grant in step S271. The BS may include a conservative MCS item in the UL grant, and the UE checks the conservative MCS item in the UL grant.

(3) The base station can receive the uplink data from the terminal in step S272. In this case, the uplink data may be data related to the LCH corresponding to the conservative MCS. The details are the same as those described above, and will not be described below.

The second embodiment proposed by the present invention is as follows.

In LTE, the base station informs the UE of TPC information when allocating resources to the UE through UL grant. This information is indispensable information for the UE to determine the transmission power when UL transmission is performed. However, the UE generates a PHY packet for the given data on the basis of the TPC information, determines only how much transmission power it should transmit, and determines which service, i.e., which LCH data is to be transmitted through the allocated UL grant It does not decide whether or not. In the second embodiment of the present invention, a method for determining whether or not a terminal transmits data belonging to an LCH through an UL grant through TPC information is proposed.

3A is a diagram illustrating an example of a situation in which a base station assigns UL grants in which different TPC commands are specified when a specific CQI and a PHR are received feedback from the UE according to an embodiment of the present invention.

The MS performs CQI feedback and PHR reporting in step S310, and provides the BS with information on the channel gain between the current BS and the UE and the available transmission power of the UE. In this embodiment, the UE can set the TPC command setting to + 1dB.

At this time, the following cases can be considered.

Case A: In step S320, the base station increases the transmission power of the UE by 1 dB compared to the previous transmission by setting a TPC command when assigning an UL grant to the UE based on CQI feedback and PHR reporting information of the UE command (+ 1dB)).

Case B: The base station increases the transmission power of the UE by 4 dB compared to the previous transmission by setting a TPC command when assigning an UL grant to the UE in step S340 based on CQI feedback and PHR reporting information of the UE command (+ 5dB)).

In general, a base station sets a TPC command so that the strength of a UL signal received by a base station becomes a target signal strength when a channel gain is given between a base station and a terminal.

For example, in the previous transmission, the BS receives the UL signal of the UE as the target signal strength. If the current channel gain is 1 dB lower than the previous transmission, the BS increases the transmission power to the UE by 1 dB Indicate.

Therefore, in the case A described above, since the UE is instructed to increase the transmission power by 1 dB compared to the previous transmission through the TPC command in the UL grant, the UE can determine that the BS observes or predicts 1 dB channel gain reduction.

Similarly, in case B described above, since the UE is instructed to increase the transmission power by 4 dB compared to the previous transmission through the TPC command in the UL grant, the UE can determine that the BS observes or predicts a 4 dB channel gain reduction.

However, the following situations can also be considered. In case B as described above, the BS instructs the UE to increase the transmission power of the UE by 4 dB compared to the previous transmission through setting the TPC command when the UL grant is allocated. Actually, the channel gain between the BS and the UE is decreased by 1 dB. The reason why the base station instructs to increase the transmission power of the UE by 4 dB through the TPC command setting may be to increase the target signal strength by 3 dB so as to receive the UL signal of the UE more stably, that is, at a lower error rate .

However, the terminal can not grasp the intention of the base station described above only by the TPC information included in the UL grant. That is, when the BS instructs the UE to increase the transmission power in comparison with the previous transmission, the objective is to (a) compensate for the decrease of the channel gain under the same target signal strength, or (b) increase the target signal strength I do not know whether it is.

It is assumed that both the URLLC traffic requesting high reliability or low error rate and the other general eMBB traffic are present in the UE buffer as described above. The UE can transmit eMBB traffic or URLLC traffic to the allocated TTI based on the TTI length and the subcarrier spacing value. At this time, if the terminal can grasp the intention of the TPC command setting of the base station described above, it can transmit data considering the TPC command intention to the length of the TTI or the subcarrier spacing value. Specifically, the terminal can perform the following operations.

- If the terminal reports the channel gain and available transmission power between the base station and the terminal and receives an UL grant from the base station and the UL grant is assigned to increase the target signal strength and achieve a lower target error rate , The UE transmits URLLC traffic requesting high reliability or low error rate among the traffic existing in the buffer through the allocated UL grant.

On the other hand, when the UE reports the channel gain and the available transmission power between the BS and the UE and receives an UL grant from the BS, the UE increases the target signal strength and allocates a UL grant to achieve a lower target error rate If not, the terminal transmits general eMBB traffic instead of URLLC traffic among the traffic existing in the buffer through the allocated UL grant.

If the UE can grasp the intention to set up the TPC command of the base station, it can determine which LCH data is to be transmitted when the UE receives the UL grant. That is, the UE can obtain the effect of improving the service quality by selecting the LCH that best matches the characteristics of the allocated UL grant.

To this end, the present invention proposes a method of adding a 1-bit indicator indicating an intention to set a TPC command when a base station allocates an UL grant to a terminal. In the present invention, the 1-bit indicator is referred to as a transmission power boost. However, the embodiment of the present invention is not limited to this, and other terms used to designate the TPC may be used. An example of this is as follows.

- If transmission power boost = 1, the UL grant and TPC commands assigned by the base station may be meant for traffic transmission requiring a low error rate.

- If transmission power boost = 0, the UL grant and TPC commands allocated by the base station may mean that it is not for URLLC traffic but for general eMBB traffic transmission.

- Table 2 below shows an example of adding 1 bit of transmission power boost to UL grant of LTE.

[Table 2]

More specifically, the operation of the terminal will be described with reference to FIG.

3B is a diagram illustrating an operation of a terminal according to an embodiment of the present invention.

(1) The terminal can receive the LCH list in step S360. The UE can receive the LCH list corresponding to transmission power boost = 1 and transmission power boost = 0. The UE can receive the LCH list corresponding to each transmission power boost through the RRC IE such as the LogicalChannelConfig IE or the like.

(2) The UE can receive the UL grant in step S361. After receiving the UL grant, the terminal checks the transmission power boost item in the UL grant.

A. When transmission power boost = 1, the UE selects LCH corresponding to transmission power boost = 1 according to the correspondence between transmission power boost and LCH provided by the base station and performs LCP operation on the selected LCH.

B. When Transmission power boost = 0, the UE selects the LCH corresponding to transmission power boost = 0 according to the correspondence between transmission power boost and LCH provided by the base station and performs LCP operation on the selected LCH.

(3) The UE performs UL transmission in step S362 after performing the LCP operation.

3C is a diagram illustrating an operation of a base station according to an embodiment of the present invention.

(1) In step S370, the base station may provide the terminal with an LCH list corresponding to transmission power boost = 1 and transmission power boost = 0. The base station can provide the terminal with the LCH list corresponding to each transmission boost through the RRC IE such as the LogicalChannelConfig IE.

(2) The base station can transmit UL grant in step S371. The base station may include a transmission power boost item in the UL grant, and the terminal checks a transmission power boost item in the UL grant.

(3) The base station can receive the uplink data from the terminal in step S272. In this case, the uplink data may be data related to the LCH corresponding to the transmission power boost. The details are the same as those described above, and will not be described below.

The third embodiment proposed in the present invention is as follows.

In the fifth generation mobile communication system or the NR system being discussed in the 3GPP, the communication between the base station and the terminal can be performed through various types of numerology and TTI length. Therefore, the UL grant allocated by the BS for UL transmission of the UE can also be one of various combinations of numerology and TTI length. In addition, these systems not only support various services having different requirements such as eMBB, URLLC, eMTC, etc., but also can easily support services expected to appear in the future without major change of the system.

Here, there may be correspondence between physical layer property information (for example, numerology and TTI length, etc.) of the UL grant and service. For example, an UL grant including specific physical property information may be more suitable when the terminal transmits eMBB traffic, and an UL grant including other physical characteristics may be more suitable when the terminal transmits URLLC traffic. The physical characteristics information that can be considered at this time are as follows.

- TTI length, slot length, symbol length

- Subcarrier spacing, cyclic prefix length

- MCS level, transmission power

- Number of symbols per subframe or TTI or slot

- the total bandwidth of allocated resources, FFT size

- Etc

The information is information necessary for generating a PHY packet in the physical layer of the terminal, and may use a term other than the physical characteristic information. The physical layer of the MS must know all the parameters listed above to generate the PHY packet and perform the UL transmission. Only then can it generate the correct PHY packet and carry out the UL transmission. However, the MAC layer of the UE does not need to know all the parameters, and only the parameters related to the scheduling such as the LCP need to be known. Notifying other parameters to the MAC layer not only increases the complexity of the terminal implementation but also unnecessary information is shared between the layers, so it should be avoided.

Therefore, the base station can inform the terminal of the physical property information of the UL grant for the LCP operation, and there are two methods for informing the terminal.

- Method 1) When assigning an UL grant to a UE, the BS informs the profile ID corresponding to the physical property of the UL grant. The concrete contents will be described with reference to FIG. In the present invention, the profile ID may be used in combination with the term physical property ID.

Method 2) The BS can inform the UE of the value of a parameter belonging to a predetermined parameter set when assigning an UL grant. Accordingly, the UE receives the parameter and confirms the value of the parameter belonging to the predetermined parameter set. Then, the parameter value included in the parameter set is used to determine which physical property ID corresponds to the allocated UL grant. The concrete contents will be described with reference to FIG.

The method 1 and the method 2 will be described below.

In the case of method 1, regardless of the physical characteristics of the UL grant allocated by the BS, the terminal grasps the physical characteristics of the UL grant only by the profile ID that the BS has notified. For example:

- UL grant 1: Subcarrier spacing = S1 kHz, TTI length = T1 ms, MCS level = M1, TPC command =

- UL grant 2: Subcarrier spacing = S1 kHz, TTI length = T1 ms, MCS level = M2, TPC command =

- UL grant 3: Subcarrier spacing = S1 kHz, TTI length = T1 ms, MCS level = M1, TPC command = +4 dB -> Physical property ID = C

- UL grant 4: Subcarrier spacing = S2 kHz, TTI length = T2 ms, MCS level = M1, TPC command =

In the above example, the UL grant 1 and the UL grant 2 are different only in the MCS level. Also, the UL grant 1 and the UL grant 3 are different only in the TPC command. Also, UL grant 1 and UL grant 4 correspond to cases where subcarrier spacing and TTI length are different. In this situation, the UL grant 1 and the UL grant 2 have different profile IDs, and the UL grant 1 and the UL grant 3 have different profile IDs. However, UL grant 1 and UL grant 4 have the same profile ID despite having different subcarrier spacing and TTI length.

In this example, the BS sets parameter (subcarrier spacing, TTI length, MCS level, TPC command, and the like) and a profile ID according to the UL scheduling intent of the BS to the MS and notifies the MS of the UL grant. Or the profile ID of < / RTI > The advantages of this method are as follows.

- The MAC layer of the UE can distinguish the UL grant through the physical ID even though it does not directly understand various parameters such as the subcarrier spacing, the TTI length, the MCS level, and the TPC command.

- The base station can freely set the parameters related to the UL grant to match the profile ID of the UL grant.

However, for the method 1, the base station must directly inform the UE of the profile ID through the UL grant. That is, the base station must include additional information in the UL grant.

Meanwhile, the BS may transmit the LCH list corresponding to the profile ID to the UE. That is, the base station can transmit the mapping information between the profile ID and the LCH to the terminal, and the base station can transmit the information to the terminal using RRC signaling.

Accordingly, the UE can receive the UL grant and perform the LCP by selecting the LCH corresponding to the profile ID included in the UL grant. The details will be described with reference to FIG.

4 is a diagram illustrating a method of directly informing a profile ID when a BS allocates an UL grant to a UE according to an embodiment of the present invention.

Referring to FIG. 4, the BS may transmit mapping information (or LCH-related mapping information) between the profile ID and the LCH in step S410. At this time, the mapping information may be configured in various ways as information indicating the relationship between the LCH and the profile ID. For example, the information may be information on a list of LCHs corresponding to each profile ID, or may be information in which a profile ID corresponding to each LCH is mapped. Alternatively, the relationship between the LCH and the profile ID can be established using another method. For example, the mapping information may be set as shown in Table 5. Details will be described later.

In step S420, the BS may transmit an UL grant to the UE. At this time, the UL grant may include the profile ID. As mentioned above, the profile ID can be set regardless of the physical property information included in the UL grant.

Therefore, the terminal can select the LCH in step S430. The terminal can select the LCH using the received profile ID and mapping information.

Then, the terminal can perform the LCP in step S440. That is, the UE can allocate the data transmitted through the selected LCH to the resource indicated by the UL grant. Alternatively, the UE can generate a transport block corresponding to the size of the resource allocated through the UL grant using the data.

Then, the terminal can transmit data in step S450.

However, the same method can be applied even when the profile ID is not used in this drawing. That is, the base station can inform the terminal of the mapping information of the profile and the LCH. Therefore, the UE may select the LCH mapped to the profile of the received UL grant without confirming the profile ID.

In the case of the method 2, the BS informs the value of the parameter belonging to the parameter set that was previously promised when assigning the UL grant to the UE, and the UE confirms the value of the parameter belonging to the promised parameter set after receiving the UL grant. Then, the UE determines which profile ID corresponds to the allocated UL grant. For example:

It is assumed that the parameters promised to be used when the BS and the UE determine the profile ID are a subcarrier spacing value and a TTI length (TTI length). At this time, the physical property information included in each UL grant may be as follows.

- UL grant 1: Subcarrier spacing = S1 kHz, TTI length = T1 ms, MCS level = M1, TPC command =

- UL grant 2: Subcarrier spacing = S1 kHz, TTI length = T1 ms, MCS level = M2, TPC command = +4 dB -> Physical property ID = A

- UL grant 3: Subcarrier spacing = S3 kHz, TTI length = T3 ms, MCS level = M1, TPC command =

Referring to the above example, the UL grant 1 and the UL grant 2 have the same TTI length as the subcarrier spacing, which is a parameter that the base station and the UE promise to determine the physical characteristic ID, and the other MCS level and the TPC command are different . Therefore, UL grant 1 and UL grant 2 can have the same profile ID.

On the other hand, the UL grant 1 and the UL grant 3 correspond to the case where the subcarrier spacing and the TTI length are different, and the other MCS level and the TPC command are the same. Therefore, UL grant 1 and UL grant 3 can have different profile IDs.

In this manner, in the method 2, the profile ID of the terminal is determined only by the parameters that the base station and the terminal promised in advance, and the other parameters have no influence on the determination of the profile ID. This method has an advantage in that no additional information is added to the UL grant.

In the method 2, unlike the method 1, the BS must inform the UE of the physical property ID by which parameter and the combination of the parameters corresponding to each physical property ID. An example of this is as follows.

For example, when the physical property ID is determined by a combination of TTI lengths such as numerology (or subcarrier spacing), the BS provides the UE with the information shown in Table 3 using an RRC message or the like.

[Table 3]

As shown in the above table, the UL grant corresponding to the profile ID 1 in the case of (numerology, TTI length) = (S1, T1) or (S1, T2).

In the case of (numerology, TTI length) = (S1, T3) or (S2, T1) or (S2, T2), it is an UL grant corresponding to profile ID 2.

In the case of (numerology, TTI length) = (S2, T3) or (S3, T1), it is an UL grant corresponding to profile ID 3.

In the case of (numerology, TTI length) = (S3, T2) or (S3, T3), it is an UL grant corresponding to profile ID 4.

In this case, if the UE is assigned an UL grant, it can check the numerology and the TTI length and know the profile ID of the UL grant through Table 3 above.

As another example, if the profile ID of the UL grant is determined by the TTI length and the conservative MCS item proposed in the present invention, the base station provides the UE with the information shown in Table 4 below using an RRC message or the like.

[Table 4]

As can be seen from the above table (TTI length, conservative MCS) = (T1, 0) or (T1, 1), it is UL grant corresponding to profile ID 1.

Also, in the case of (TTI length, conservative MCS) = (T2, 1) or (T3, 1), it is an UL grant corresponding to profile ID 2.

In the case of (TTI length, conservative MCS) = (T2, 0) or (T3, 0), it is UL grant corresponding to profile ID 3.

In the case of (TTI length, conservative MCS) = (T4, 0) or (T4, 1), it is an UL grant corresponding to the profile ID 4.

In this case, if the UE receives the UL grant, it can check the TTI length and the conservative MCS item, and find out which profile ID the UL grant allocated through the above table has.

4, the BS may transmit the LCH list corresponding to the profile ID to the MS. That is, the base station can transmit the mapping information between the profile ID and the LCH to the terminal, and the base station can transmit the information to the terminal using RRC signaling.

In addition, the base station can transmit information on a parameter set for use by the terminal to confirm the profile ID to the terminal.

Accordingly, the terminal can receive the UL grant and confirm the profile ID based on the physical property information (parameter) included in the UL grant. Then, the terminal can perform the LCP by selecting the LCH corresponding to the profile ID. The concrete contents are described in Fig.

FIG. 5 is a flow chart illustrating a method of transmitting a UL grant to a UE according to an embodiment of the present invention. Referring to FIG. 5, the UE notifies the UE of a profile ID directly or indirectly through UL grant or other signaling, FIG. 8 is a diagram illustrating a method for deriving a profile ID by comparing the correspondence relationship between the ID and the parameter. FIG.

Referring to FIG. 5, the BS may transmit mapping information (LCH-related mapping information or first mapping information) between the profile ID and the LCH in step S510. At this time, the method of transmitting the mapping information is the same as the method described in FIG. 4, and the details will be described later.

The base station can transmit the parameter set information to the terminal in step S520. At this time, the parameter set information may be configured in various ways as information for use in confirming the profile ID. For example, the information may be information on a parameter set corresponding to each profile ID, or may be information on which a profile ID corresponding to each parameter set is mapped. Alternatively, the relationship between the parameter set and the profile ID can be set using another method. Therefore, the parameter set information may be referred to as mapping information between a parameter and a profile ID, parameter related mapping information, or second mapping information.

The base station can transmit an UL grant to the UE in step S530. At this time, the UL grant may not include the profile ID.

In step S540, the BS can confirm the profile ID using the physical property information (or parameter) included in the UL grant and the parameter-related mapping information.

The base station can select the LCH in step S550. The terminal can select the LCH using the received profile ID and LCH-related mapping information.

Thereafter, the base station can perform the LCP in step S560. That is, the UE can allocate the data transmitted through the selected LCH to the resource indicated by the UL grant. Alternatively, the UE can generate a transport block corresponding to the size of the resource allocated through the UL grant using the data.

The terminal can transmit data in step S570.

However, the same method can be applied even when the profile ID is not used in this drawing. That is, the base station can inform the terminal of the parameter set information (or profile), and can notify the terminal of the mapping information of the parameter set and the LCH. Therefore, the terminal can select the LCH mapped according to the information set in the parameter set without confirming the profile ID.

In the above description, a case where information necessary for deriving the profile ID of the UL grant, for example, numerology, TTI length, MCS, TPC command, conservative MCS, transmission power boost, Respectively. However, the terminal may be able to grasp this information, in particular numerology and TTI length, in other ways besides the UL grant. An example of this is as follows.

1. A base station sets a bandwidth part in which control information such as a PDCCH or a data channel such as a control channel and a PDSCH is transmitted and received to a mobile station. This can be done through RRC signaling.

- At this time, each bandwidth part can correspond to a specific numerology or a specific TTI length. The correspondence between the bandwidth part and the specific numerology or the specific TTI length can be informed by the base station through RRC signaling.

- Therefore, if the terminal has set a specific bandwidth part from the base station, it can grasp the numerology or TTI length of the UL resource to which it is allocated.

2. The BS establishes a bandwidth part that the MS should monitor in order to receive control information such as the PDCCH. This can be done through RRC signaling.

- At this time, each bandwidth part can correspond to a specific numerology or a specific TTI length. The correspondence between the bandwidth part and the specific numerology or the specific TTI length can be informed by the base station through RRC signaling to the terminal.

Therefore, if a specific bandwidth part is set for the purpose of receiving control information such as a PDCCH from the BS, the MS can determine the numerology or TTI length of the UL resource to be allocated to the UE.

3. The BS informs the MS of the time and frequency resource location for transmitting and receiving data, such as the PDSCH, through the control information such as the PDCCH, and the MS receiving the resource can determine which bandwidth part the allocated resource belongs to.

- At this time, each bandwidth part can correspond to a specific numerology or a specific TTI length. The correspondence relationship between the bandwidth part and the specific numerology or the specific TTI length can be informed to the terminal by the base station by the RRC signaling.

Therefore, if a time / frequency resource of a specific bandwidth part is allocated as a resource to transmit / receive data, the UE can determine the numerology or TTI length of the UL resource allocated to the UE.

4. The base station informs the UE of the time interval of the subframe or slot or symbol or the PDCCH monitoring occasion (PDCCH monitoring occasion) that the UE should monitor to receive control information such as the PDCCH. This can be done through RRC signaling.

- The time interval or PDCCH monitoring occasion of a subframe or slot or symbol that should be monitored to receive control information at this time may correspond to a specific numerology or a specific TTI length. The correspondence between the PDCCH monitoring occasion and the specific numerology or the specific TTI length can be informed to the UE by the RRC signaling.

Therefore, if a specific time interval or a specific PDCCH monitoring occasion is set as a time interval to be monitored to receive control information, the UE can determine the numerology or TTI length of the UL resource to be allocated thereto.

5. The base station informs the terminal of the time interval and the bandwidth part of the subframe or slot or symbol that the terminal should monitor in order to receive the control information such as the PDCCH. This can be done through RRC signaling.

- The combination of bandwidth part (or PDCCH monitoring occasion) of subframe or slot or symbol that should be monitored to receive control information at this time may correspond to specific numerology or specific TTI length. This correspondence can be set in the terminal through RRC signaling.

Therefore, if a specific time interval and a bandwidth part are allocated to a time interval and a frequency domain to be monitored to receive control information, the UE can determine the numerology or TTI length of the UL resource to which the UE is allocated.

6. A correspondence between DCI format and numerology or TTI length (or a combination of numerology and TTI) used when the BS allocates UL grant to the UE can be established.

For example, the UL resource allocated through the UL grant using DCI format1 may be predefined to be a specific numerology N1 or a specific TTI T1. Therefore, the UE can know the numerology or the TTI length of the UL resource allocated using the DCI format information. Likewise, the UL resource allocated through the UL grant using DCI format 2 may be predefined to be a particular numerology N2 or a specific TTI T2. Accordingly, the UE can know the numerology or the TTI length of the UL resource allocated using the DCI format information.

- The correspondence between such DCI format and numerology or TTI or a combination thereof can be sent to the terminal via RRC signaling or set between the base station and the terminal as specified in the specification.

A description has been given of a method of obtaining the profile ID of the UL grant that the terminal has allocated from the base station. The reason for distinguishing the UL grant according to the physical characteristics is to transmit the traffic belonging to the more suitable service (i.e., LCH) through the UL grant when the UE is allocated an UL grant having a specific physical characteristic.

Therefore, the BS defines the corresponding relationship of the LCH, which is suitable for transmission when the UL grant having the profile ID and the corresponding physical property is allocated, and informs the UE. The correspondence between the profile ID and the LCH can be informed to the terminal by the base station transmitting a message such as logical channel configuration to the terminal through RRC signaling.

Also, as described above, the profile ID can be included in the downlink control information (DCI) when the base station assigns the UL grant to the UE.

The correspondence between the profile ID and the LCH can be set as shown in Table 5, for example.

[Table 5]

Table 5 above shows the correspondence between physical ID and LCH. In order to transmit the information to the mobile station, the base station may include the profile ID in the information on the logical channel when providing information on a specific logical channel to the mobile station through an RRC message.

Table 6 below shows an example of a RRC information element (LogicalChannelConfig information element) to be used when the BS provides information on a specific logical channel to the UE, that is, a profile ID specified as profileIdentity Respectively.

[Table 6]

The bucket size duration (bucket SizeDuration) indicates a bucket size duration for the LCP operation, and is a parameter for determining the maximum data size that can be allocated in the LCP 1 stage.

The logical channel group (logicalChannelGroup) represents an ID of a logical channel group to which a logical channel belongs. The parameter is used for BSR (operation informing the base station of the data size in the buffer).

The logicalChannelSR-Mask can control whether or not SR can be started for each logical channel when UL resources are allocated to the UE.

If the logicalChannelSR-ProhibitTimer is set to TRUE, it indicates that logicalChannelSR-ProhibitTimer is used for the logical channel. For E-UTRA, the item can be applied only when logicalChannelSR-ProhibitTimer is set.

PrioritizedBitRate can indicate the prioritized bit rate used for LCP operation (it can indicate the parameter that determines the size of the data to be allocated in step 1 of the LCP).

The priority can indicate the priority of the logical channel.

The profile ID (profileIdentity) may indicate a profile ID corresponding to a specific logical channel. When a terminal receives a UL resource having a specific profile ID, the terminal selects a logical channel corresponding to the profile ID and performs an LCP operation on the selected logical channel.

Therefore, if the UE confirms the profile ID after receiving the UL grant and confirms that the profile ID is 1, the terminal performs the LCP procedure on the LCH a and LCH b.

Also, after the terminal receives the UL grant, it checks the profile ID and if the profile ID is 2, it performs the LCP procedure on LCH c and LCH d.

Also, after the terminal receives the UL grant, it confirms the profile ID, and if the profile ID is 3, it performs the LCP procedure on LCH a, LCH b, LCH c, and LCH d.

At this time, the method of confirming the profile ID is a method (Method 1) in which the terminal directly includes the profile ID in the UL grant and confirms the profile ID in the UL grant, as described above, You can use the method to check the ID (Method 2).

As described above, according to the present invention, a terminal receives an UL grant, confirms a profile ID, selects a corresponding LCH, and performs an LCP operation. In the present invention, the base station includes a method of independently setting the priority among the LCHs according to the profile IDs for the LCP operation of the terminal. That is, in the above example, if the UE has been assigned an UL grant with a profile ID of 1, the priority between the LCHs is set in the order of LCH a> LCH b. If the UE has been assigned an UL grant having the profile ID 2, Set the priority between LCHs. Also, if the UE has been assigned the UL grant with the profile ID 3, the priority between the LCHs is set in the order of LCH d> LCH c> LCH b> LCH a.

The fourth embodiment proposed in the present invention is as follows.

In the fifth generation mobile communication system or NR, a plurality of UL grants having different numerology or TTI length may be allocated to the UE according to the design of the physical layer. In this case, the UE needs a method for determining which UL grant is to be processed first among a plurality of UL grants. The BS and the UE can perform different operations according to the order in which the UE processes the UL grant. First, the effect of the UL grant processing sequence on the base station and the UE will be described.

First, the UL grant processing order of the UE may affect the remaining traffic amount of each LCH after the LCP. Details will be described below.

6 is a diagram illustrating the amount of data belonging to each LCH and Bj of each LCH j according to an embodiment of the present invention.

At this time, it is assumed that the UE uses three LCHs (LCH a 610, LCH b 620, and LCH c 630), and the order of priority among LCHs is LCH a, LCH b, and LCH c .

The amount of data 640 included in each LCH is as shown in FIG. 6, and the amounts of data Ba (650), Bb (660), and Bc (670) to be preferentially allocated among the data included in the LCH, As shown in FIG.

It is also assumed that the UE has allocated two UL grants (UL grant X and UL grant Y) and UL grant X can be used to transmit LCH a and LCH b, and UL grant Y can be used to transmit LCH a and c do. At this time, the amount of data that each UL grant can transmit is as shown in FIG.

FIG. 7 is a diagram illustrating the correspondence between two kinds of UL grant and UL grant and LCH allocated to a terminal by a base station according to an embodiment of the present invention. Referring to FIG. 7, the UL grant X is mapped to LCH a and b, and the UL grant Y is mapped to LCH a and c.

In addition, the amount of data that each UL grant can transmit is equal to (730) and (740) shown in FIG. 7, respectively.

In this situation, the UL grant processing order of the UE can affect the amount of traffic remaining in each LCH, and the details will be described with reference to FIG. 8 and FIG.

FIG. 8 is a diagram showing an example of processing the UL grant X first and then processing the UL grant Y. FIG.

Referring to FIG. 8, since data included in LCH a and LCH b can be allocated to UL grant X 810, Ba (811) of LCH a having a higher priority is first allocated, and then Bb (812). Thereafter, the data 813 of the LCH a remaining in the remaining resources of the UL grant X is allocated.

Next, since all the data of LCH a is allocated, data 821 and 822 of LCH c are allocated to UL grant Y 820. FIG. 9 shows an example of processing UL grant Y first and UL grant X next Fig.

9, since LCH a and LCH c can be transmitted in the UL grant Y 910, Ba (911) of LCH a having a higher priority is first allocated, and then Bc 912 of LCH c is allocated do. Thereafter, data 913 of LCH a remaining in the remaining resources of the UL grant is allocated.

Next, Bb 921 of LCH b is allocated to UL grant X 920 first. The remaining data 922 of LCH a is then allocated and then the remaining data 923 of LCH b is allocated.

The amount of data remaining in each LCH after LCP for each case is shown in FIG. 8 (840) and FIG. 9 (940). The amount of data remaining in each LCH after the LCP is different according to the processing order of the UL grant. Therefore, the processing order of the UL grant affects the remaining data amount of each remaining LCH after the LCP.

Meanwhile, the UL grant processing procedure of the UE can affect the HARQ retransmission (HARQ retransmission), and the details will be described with reference to FIG.

FIG. 10 is a diagram illustrating an example in which different UL grants have different HARQ timelines.

Assume that there are 100 data to be transmitted in the buffer of the UE. It is also assumed that the UE receives two UL grants (UL grant X and UL grant Y) at the same time.

Referring to FIG. 10, the UL grant X may have a shorter HARQ timeline than the UL grant Y. FIG. Also assume that the size of the data that can be transmitted through the UL grant X is 40 and the size of the data that can be transmitted through the UL grant Y is 80. In this situation, the following two cases can be considered.

Case 1) The terminal processes the UL grant X first and the UL grant Y later.

Since there are 100 data to be transmitted in the buffer of the UE, the UE allocates 40 pieces of data to the UL grant X first and then allocates 60 pieces of data to the UL grant Y. [

Case 2) The terminal processes UL grant Y first and UL grant X later.

Since there are 100 data to be transmitted in the buffer of the UE, the UE allocates 80 data to UL grant Y first and then allocates 20 data to UL grant X. [

Comparing the above two cases, the amount of data allocated to the UL grant X with a shorter HARQ timeline varies depending on the case. Since the UL grant X has a shorter HARQ timeline, it is advantageous for the UE to transmit data through the UL grant X in terms of latency. Therefore, in case of transmitting more data through UL grant X, it is more advantageous than 1 in case of 2 in terms of latency. That is, when data is allocated in the same order as Case 1, the UE determines the HARQ ACK / NACK more quickly and performs the retransmission more quickly, so that the UE can process the traffic in the buffer more quickly.

As described above, since the processing order of the UL grant affects the amount of remaining traffic and the HARQ retransmission, there is a need for a method of processing the UL grant when the UE receives the UL grant having a plurality of different characteristics. Basically, the following method can be considered.

- Method 1: The BS determines the order of the UL grant processing of the UE, i.e., which UL grant should be processed first, and informs the UE of the UL grant through the RRC message. When the UE receives a plurality of UL grants in accordance with the UL grant process sequence informed by the base station, the UE processes the UL grants in order.

- Method 2: Specify the processing order of the UL grant in the standard document that specifies the operation of the base station and the terminal. In this case, when the terminal receives a plurality of UL grants, the terminal processes the UL grants in the order specified in the standard document.

- Method 3: The UL grant processing order of the UE is decided by the UE itself by the UE implementation.

The UL grant processing sequence that can be applied to each of the above-described methods is as follows.

- When the terminal receives a plurality of UL grants, the terminal processes the UL grants in the order of the shortest TTI.

- When receiving a plurality of UL grants, the terminal checks the priority of LCHs that can be sent through each UL grant and processes the UL grants in the ascending order of priority. For example, it is assumed that the UE receives UL grant X and UL grant Y at the same time and can transmit LCH 1 and LCH 3 through UL grant X and can transmit LCH 2 and LCH 4 through UL grant Y . In addition, if there is a high priority among the LCHs in the order of LCH 1, LCH 2, LCH 3, and LCH 4, the UE processes the UL grant X that can transmit the highest priority LCH 1 first and then the UL grant Y .

- The UE sequentially detects the UL grant while decoding the PDCCH. At this time, if the UE detects a plurality of UL grants, the UE processes the UL grants in the order in which the respective UL grants are detected. Also, the base station determines the UL grant processing order of the UE and encodes the PDCCH including a plurality of UL grants so that the UE can detect the UL grant according to the order.

- When a terminal receives a plurality of UL grants, the terminal checks the number of bits that can be sent through each UL grant and processes the UL grant in the order that it can send a lot of bits. By using this method, it is possible to reduce the situation in which data belonging to one LCH is distributed to a plurality of UL grants and transmitted.

Hereinafter, a specific method of determining the UL grant processing order of the UE when the UE receives a plurality of UL grants from the BS is proposed. As described above, in the fifth generation mobile communication system or the 3GPP NR (New Radio) system considered in the present invention, different numerology (or subcarrier spacing or cyclic prefix length) or TTI length May be used. For example, if the system supports subcarrier spacing of 15 kHz, 30 kHz, 60 kHz, 120 kHz and TTI lengths of 1 symbol, 2 symbols, 1 slot, 1 subframe, then the radio resources used for communication between the base station and the terminal It may correspond to one of the resource types shown in Table 7 below. The index of this kind of resource is called a resource profile in the present invention.

[Table 7]

In the present invention, UL communication between the base station and the terminal is considered. If the BS allocates a plurality of UL grants to the UE at the same time or within a specific time, the UE may start to simultaneously process a plurality of UL grants allocated from the BS. At this time, according to the UL grant processing order of the UE, the amount of traffic to be transmitted to the Node B by the UE, i.e., the amount of the logical channel received from the UE by the Node B, may be changed. This is because different UL grants may be assigned to transmit traffic belonging to different logical channels. The details are the same as those described above.

If the base station knows the UL grant processing order of the terminal, resource allocation can be performed in a state in which the base station knows the amount of remaining traffic for each logical channel of the terminal more accurately when the base station allocates an additional UL grant. Accordingly, it is preferable that the UE generates a packet to be transmitted according to the UL grant processing procedure determined when a plurality of UL grants are allocated from the base station, and the base station reflects the UL grant processing order when the UE allocates resources to be generated later. Therefore, a method for determining the UL grant processing order is proposed below.

There may be an example in which the UE receives a plurality of UL grants from the base station and starts processing the same at the same time.

(1) The UE simultaneously receives a plurality of UL grants from different CCs.

(2) The terminal simultaneously receives a plurality of UL grants from different BWP (Bandwidth Part) in one CC.

≪ Example 4-1 >

In a fifth generation mobile communication system or an NR system, a specific LCH can be transmitted only through an UL grant having a specific attribute. Here, the attributes of the UL grant may be numerology, TTI length, transmission power, processing time, CC, subcarrier spacing, and CP (Cyclic Prefix) length. For example, the LCH for eMBB can be transmitted through an UL grant with a TTI length of 1 symbol, 2 symbols, 1 slot, and 1 subframe. However, the LCH for URLLC can only be transmitted through an UL grant having a TTI length of 1 symbol and 2 symbols, and can not be transmitted through an UL grant having a TTI length of 1 slot and 1 subframe.

There is also a priority between the LCHs. For example, the base station sets the priority of the corresponding LCH when setting the LCH to the terminal. Accordingly, when the UE receives the UL grant, it can perform an LCP (Logical Channel Prioritization) operation according to the priority between the LCHs. That is, the UE inserts a certain amount of traffic into an allocated UL grant in the order of the LCH having the higher priority, and then includes the remaining traffic in the buffer in the UL grant in the order of the higher priority LCH. The details are the same as those described above.

In this NR system, there exists (i) correspondence between UL grant and LCH and (ii) priority between LCHs. Therefore, a terminal that has been assigned an UL grant can grasp the following information according to the LCH that can be transmitted through the UL grant allocated by the information given in advance and the priority between the LCHs.

The minimum value of the LCH priority that can be transmitted through the assigned UL grant. The minimum meaning here is that LCH has the highest priority.

② The maximum value of the LCH priority that can be transmitted through the allocated UL grant. The maximum meaning here is that the priority of the LCH is lowest.

③ Average value of LCH priority that can be transmitted through allocated UL grant

As an example, it is assumed that the base station sets LCH a, LCH b, and LCH c to the UE, and that the priority of each LCH is 1, 2, and 3 in the order of LCH a, LCH b, and LCH c. Assuming that the UE receives three UL grants from the BS, the LCH that can be transmitted through each UL grant is as shown in Table 8 below. If so, the information described above can be derived as shown in Table 8.

[Table 8]

Based on this, in the present invention, when a terminal receives a plurality of UL grants, the UL grant processing order can be determined as follows.

(1) The UE shall check the LCH that can be transmitted through the assigned UL grant.

② The terminal checks the priority of LCH.

③ The terminal derives at least one of the following based on the priority of the LCH. Hereinafter, the values derived below can be referred to as LCH priority related information.

- Minimum value of LCH priority that can be transmitted through assigned UL grant

The maximum value of the LCH priority that can be transmitted through the assigned UL grant.

- Average value of LCH priority that can be transmitted through allocated UL grant

④ Based on the derived LCH priority related information, the terminal can determine the UL grant processing order by any one of the following methods.

- The UL grant is processed in the order of the smallest value of the LCH priority that can be transmitted through the assigned UL grant.

- The UL grant is processed in the ascending order of the maximum value of the LCH priority that can be transmitted through the assigned UL grant.

- Process the UL grant in order of smaller average LCH priority that can be transmitted through the assigned UL grant.

If there is a plurality of UL grants having the same minimum value, maximum value, or average value of the LCH priority that can be transmitted through the LCH priority related information derived by the UE, that is, the UL grant allocated from the base station, May be determined by other proposals of the present invention.

≪ Example 4-2 &

11 is a diagram illustrating a HARQ time relationship according to an embodiment of the present invention.

The NR system supports a flexible HARQ timeline. 11, the time until the UE receives the UL grant from the base station and transmits data is referred to as Ta, and the time until the base station receives the data from the terminal and transmits ACK or NACK can be named Tb . At this time, the lengths of Ta and Tb may be variable depending on the setting of the base station, the negotiation between the base station and the terminal, or the predetermined standard.

Here, the base station can inform the terminal through UL grant. Also, the base station informs the UE about the correlation between the resource profile and the TA through the RRC signaling and informs the UE of the resource profile through the UL grant, so that the UE can grasp the Ta when the UL grant is received . At this time, the information on the correlation between the resource profile and Ta may include information on the correlation between all or some of the information included in the UL grant and Ta, or information on the correlation between the profile ID and Ta described above Lt; / RTI >

Also, the Tb may be determined by the BS allocating a resource to feedback the ACK / NACK to the UE, or the BS may inform the UE through UL grant or RRC signaling.

The time taken until the terminal receives the UL grant from the base station and the terminal receives the ACK / NACK for the data transmitted by the base station from the base station is called Tc. In the present invention, terms such as a first time, a second time and a third time may be used to distinguish the Ta, Tb and Tc.

In this embodiment, when a terminal receives a plurality of UL grants from a base station, it proposes a method of processing UL grants in order of data transmission time. That is, Ta processes the UL grant in a short sequence. The details are described in Fig.

12 is a diagram illustrating time between various UL grant reception time and data transmission time according to an embodiment of the present invention.

① The UE checks the time taken to transmit the data after receiving the UL grant, that is, Ta. At this time, the following method can be used to confirm Ta.

- Ta may be specified in a specific field in DCI (Downlink Control Information).

- As another example, the DCI specifies the profile ID (ID) of the UL resource allocated to the terminal by the base station, and the terminal can identify Ta through the mapping relationship between the profile ID and Ta provided by the base station through RRC signaling have.

- As another example, the terminal may determine Ta according to the bandwidth part where the UL resource allocated from the base station belongs. To do this, the base station can provide a mapping relationship between the bandwidth part and the Ta through RRC signaling. That is, UL resources allocated within a specific bandwidth part may have a specific Ta. Details will be described later.

- As another example, the terminal may grasp Ta according to the time and frequency resources (or PDCCH monitoring occasion) of the PDCCH received from the base station. For this, the base station can provide the mapping relationship between the time and frequency resources of the PDCCH and Ta through RRC signaling. That is, the UL resource allocated through the PDCCH received at a specific time and frequency resource (or PDCCH monitoring occasion) may have a specific Ta. Details will be described later.

- As another example, the terminal may determine Ta from the type of DCI format received from the base station. For this, the base station can provide the mapping relationship between DCI format and Ta through RRC signaling. Or the mapping relationship between DCI format and Ta in a specification document describing the physical layer or MAC layer operation of the base station and the terminal. That is, UL resources allocated through a particular DCI format may have a specific Ta.

(2) Then, the terminal processes the UL grant in the order of Ta short.

(3) If there are a plurality of UL grants having the same time required for data transmission after receiving the UL grant, that is, the metric derived by the UE in step 1, the processing order between them can be determined according to another proposed method of the present invention.

12, the time between the UL grant 1 reception time and the data 1 transmission time is T _{a , 1} (1210), the time between the UL grant 2 reception time and the data 2 transmission time is T _{a, 2} (1220 The time between the UL grant 3 reception time and the data 3 transmission time is T _{a , 3} (1230), and the time between the UL grant 4 reception time and the data 4 transmission time is T _{a , 4} (1240).

According to the proposed method in the present invention, the time between the transmission time of the reception of the UL grant time and the data is _{T a, 1 (1210) <} T a, 2 (1220) <T a, 3 (1230) <T a, 4 The UE can process the UL grant in the order of UL grant 1, UL grant 2, UL grant 3, and UL grant 4, as shown in FIG.

The same principle also applies to the present invention that when a terminal receives a plurality of UL grants from a base station, it can also process UL grants in a slow order of data transmission time. That is, Ta processes the UL grant in the long order. Referring to FIG. 12, the UE can process an UL grant in the order of UL grant 4, UL grant 3, UL grant 2, and UL grant 1.

Meanwhile, in this embodiment, when the UE receives a plurality of UL grants from the base station, it proposes a method of processing UL grants in the order of shortest ACK or NACK reception time for data transmission from the UL grant reception time. That is, the UL grant is processed in the order of Tc being short. The details will be described with reference to FIG.

13 is a diagram illustrating time between various UL grant reception time points and ACK / NACK reception time points according to an embodiment of the present invention.

① The UE checks the time taken to transmit the data after receiving the UL grant, that is, Ta. At this time, the following method can be used to confirm Ta.

- Ta may be specified in a specific field in DCI (Downlink Control Information).

- As another example, the DCI specifies the profile ID (ID) of the UL resource allocated to the terminal by the base station, and the terminal can identify Ta through the mapping relationship between the profile ID and Ta provided by the base station through RRC signaling have.

- As another example, the terminal may determine Ta according to the bandwidth part where the UL resource allocated from the base station belongs. To do this, the base station can provide a mapping relationship between the bandwidth part and the Ta through RRC signaling. That is, UL resources allocated within a specific bandwidth part may have a specific Ta. Details will be described later. - As another example, the terminal may grasp Ta according to the time and frequency resources (or PDCCH monitoring occasion) of the PDCCH received from the base station. For this, the base station can provide the mapping relationship between the time and frequency resources of the PDCCH and Ta through RRC signaling. That is, the UL resource allocated through the PDCCH received at a specific time and frequency resource (or PDCCH monitoring occasion) may have a specific Ta. Details will be described later.

- As another example, the terminal may determine Ta from the type of DCI format received from the base station. For this, the base station can provide the mapping relationship between DCI format and Ta through RRC signaling. Or the mapping relationship between DCI format and Ta in a specification document describing the physical layer or MAC layer operation of the base station and the terminal. That is, UL resources allocated through a particular DCI format may have a specific Ta.

(2) Then, the UE checks the time required to receive ACK or NACK after data transmission, that is, Tb. At this time, the following method can be used to confirm Tb.

- Tb may be determined by the base station allocating resources to feedback the ACK / NACK to the UE.

- As another example, the DCI has the profile ID of the UL resource allocated to the terminal by the base station, and the terminal can grasp the Tb through the mapping relation between the profile ID and the Tb provided from the base station through the RRC signaling.

- As another example, the terminal may determine Tb according to the bandwidth part where the UL resource allocated from the base station belongs. For this, the base station can provide the mapping relationship between the bandwidth part and the Tb through the RRC signaling. That is, a UL resource allocated in a specific bandwidth part may have a specific Tb. Details will be described later.

- As another example, the UE may determine the Tb according to the time and frequency resources (or PDCCH monitoring occasion) of the PDCCH received from the base station. For this, the base station can provide the mapping relationship between the time and frequency resources of the PDCCH and the Tb through RRC signaling. That is, a UL resource allocated through a PDCCH received in a specific time and frequency resource (or PDCCH monitoring occasion) may have a specific Tb. Details will be described later.

- As another example, the terminal may determine Tb from the type of DCI format received from the base station. For this, the base station can provide the mapping relationship between DCI format and Tb through RRC signaling. Or the mapping relationship between DCI format and Tb is described in a specification document describing the physical layer or MAC layer operation of the base station and the terminal. That is, UL resources allocated through a particular DCI format may have a certain Tb.

(3) Then, the terminal derives Tc by summing the derived Ta and Tb.

(4) The UE processes the UL grant in the order of Tc, that is, the ACK or NACK reception time for data transmission from the UL grant reception time in the shortest sequence.

(5) If there are a plurality of UL grants having the same time required to receive ACK or NACK for data transmission after receiving the UL grant and the metric derived by the UE in step 4, Can be determined.

13, the time between the UL grant 1 reception time and the ACK or NACK reception time is T _{c , 1} (1310), the time between the UL grant 2 reception time and the ACK or NACK reception time is T _{c , 2} The time between the UL grant 3 reception time and the ACK or NACK reception time is T _{c , 3} (1330), the time between the UL grant 4 reception time and the ACK or NACK reception time is T _{c , 4} (1340) Can be expressed.

According to the method proposed by the present invention, the time between the reception of the UL grant and the reception of the ACK or NACK is T _{c , 1} 1310 <T _{c , 2} 1320 <T _{c , 3} 1330 <T _{c , 4} 1340, the UE can process the UL grant in the order of UL grant 1, UL grant 2, UL grant 3, and UL grant 4 in this order.

According to the same principle as described above, when the UE receives a plurality of UL grants from the base station, it is possible to process the UL grant in the order of longest ACK or NACK reception time for data transmission from the UL grant reception time. Referring to FIG. 13, the UE can process UL grant in the order of UL grant 4, UL grant 3, UL grant 2, and UL grant 1.

Meanwhile, in another embodiment of the present invention, when a terminal receives a plurality of UL grants from a base station, it proposes a method of processing UL grants in the order of shortest ACK or NACK reception time from a data transmission time. That is, the UL grant is processed in the order of Tb being short. Specific details are described in Fig.

FIG. 14 illustrates time between various data transmission time points and ACK / NACK reception time points according to an embodiment of the present invention. Referring to FIG.

① The UE checks the time taken to receive ACK or NACK after data transmission, that is, Tb. At this time, the method for confirming Tb is the same as described above, and will be omitted below.

(2) The terminal processes the UL grant in the order of the shortest Tb obtained in the first step.

(3) If there are a plurality of UL grants having the same time required to receive an ACK or a NACK after data transmission, that is, the metric derived by the UE in step 2, the processing order between them can be determined according to another proposed method of the present invention.

14, the time between the data 1 transmission point and the ACK or NACK reception point is T _{b , 1} (1410), the time between the data 2 transmission point and the ACK or NACK reception point is T _{b , 2} 1420 The time between the transmission of the data 3 and the reception of the ACK or NACK is T _{b, 3} (1430), and the time between transmission of the data 4 and reception of the ACK or NACK is T _{b , 4} (1440).

According to the proposed method in the present invention, the time between the reception time and the ACK or NACK reception time of the UL grant is _{T b, 1 (1410) <} T b, 2 (1420) <T b, 3 (1430) <T b, ₄ 1440, the UE can process the UL grant in the order of UL grant 1, UL grant 2, UL grant 3, and UL grant 4.

According to the same principle as described above, when a terminal receives a plurality of UL grants from a base station, it is also possible to process the UL grant in the order of longest ACK or NACK reception time from the data transmission time. That is, the UL grant is processed in the order of Tb long. Referring to FIG. 14, the UE can process an UL grant in the order of UL grant 4, UL grant 3, UL grant 2, and UL grant 1.

If the UL grant processing sequence is determined according to this method, particularly, in the order of Ta, Tb, or Tc, the UE preferentially uses the UL grant with a shorter HARQ timeline than the UL grant with a longer HARQ timeline. Therefore, it is possible to prevent the UE from using the UL grant having a short HARQ timeline less than the UL grant having a long HARQ timeline, and as a result, it is possible to quickly determine whether a retransmission or a new transmission is possible for a large amount of traffic.

&Lt; Example 4-3 >

In the NR system, the BS can allocate a plurality of UL grants having different TTI lengths to the UE.

15 is a diagram illustrating UL grants allocated in various TTI types according to an embodiment of the present invention and a UL transmission time according to the UL grants.

15, an example in which a base station allocates UL resources having a 1-symbol TTI 1510, a 2-symbol TTI 1520, a 1-slot TTI 1530, and a 1-subframe TTI 1540 to the UE, respectively.

Here, the DCI including the UL resource allocation information may be transmitted to the UE through a symbol or a slot or a subframe having the same TTI length as the allocated resource, or may be transmitted through a symbol or a slot or a subframe having a different TTI length Or may be transmitted to the terminal. Also, a plurality of DCIs allocating a plurality of UL resources having different TTI lengths may be delivered to the UE through one PDCCH. Details will be described in Fig. 16 and Fig.

16 is a diagram illustrating a case where UL resources having different TTIs are allocated through UL grants transmitted through a specific TTI according to an embodiment of the present invention.

16, a UE can receive an UL grant through a 1 slot TTI 1610, and a resource allocated by the UL grant can be a resource having a length of 1 subframe TTI (1620). The DCI including the UL resource allocation information may be transmitted to the UE through a resource having a different TTI from the allocated resource.

17 is a diagram illustrating a case where UL resources having a plurality of different TTIs are allocated through a PDCCH transmitted in one TTI according to an embodiment of the present invention.

Referring to FIG. 17, a UE can receive an UL grant through a 1 slot TTI 1710, and the UL grant can allocate a plurality of UL resources having different TTI lengths. Specifically, in this figure, an UL grant can allocate UL resources having a 1 slot TTI (1720) and UL resources having a 1 subframe TTI (1730). 15 to 17 can be applied to all the embodiments described in the present invention.

In the present invention, when a terminal receives a plurality of UL grants from a base station, it proposes a method of processing UL grants in order of shortened TTI lengths of allocated resources. This is explained as follows.

The UE confirms the TTI length of the allocated resources after receiving the UL grant. At this time, a method of checking the length of the TTI is as follows.

- The base station can specify the TTI length in the DCI so that the terminal can accurately grasp the TTI length of the UL resource.

- In addition, the DCI specifies the profile ID of the UL resource allocated to the UE by the BS, and the BS provides the mapping relationship between the profile ID and the TTI length through RRC signaling. If the UE receives the UL grant, the UE can confirm the profile ID through the DCI and determine the TTI length of the UL resource through the mapping relationship between the profile ID and the TTI length.

The base station also provides a mapping relationship between DCI format and TTI length through RRC signaling. If the UE receives the UL grant, the UE can check the DCI format and determine the TTI length of the UL resource through the mapping relationship between the DCI format and the TTI length.

- The base station also provides the mapping relationship between the TTI length and the bandwidth part to which the UL resource is allocated through the RRC signaling. In this case, the UE can determine the TTI length of the UL resource by checking the bandwidth part of the UL resource allocated when receiving the UL grant and mapping relation between the bandwidth part and the TTI length. The mapping relationship between the bandwidth part and the TTI length is described in Fig.

- The base station also provides the mapping relationship between PDCCH monitoring time and TTI length through RRC signaling. This assumes that the base station allocates a UL resource composed of only one TTI length at the time of monitoring one PDCCH. . In this case, the UE can confirm the PDCCH monitoring time when receiving the UL grant, and can grasp the TTI length of the UL resource through the mapping relationship between the TTI length and the TTI length. The details are described in Fig. 19

- The base station also provides a mapping relationship between PDCCH monitoring period and TTI length of the UE through RRC signaling. It is assumed that the BS allocates a UL resource composed of only one TTI length in a PDCCH transmitted in a specific period. In this case, the UE checks the monitoring cycle of the corresponding PDCCH upon receipt of the UL grant, and can grasp the TTI length of the UL resource through the mapping relationship between the TTI length and the TTI length.

- The base station also provides a mapping relationship between transmission duration and TTI length through RRC signaling. An example of this is as follows. Here, the transmission period means a period in which the UE actually transmits the radio signal, and the TTI length is not the same. However, in this embodiment, it is assumed that the transmission period and the TTI length are proportional. Because there is no need to allocate resources of short TTIs for long periods of transmission and likewise there is no need to allocate resources of long TTIs for short periods of transmission. Such a transmission period can be informed by the base station through the DCI or the like to the terminal. In this case, the UE can check the transmission period when receiving the UL grant and determine the TTI length of the UL resource through the mapping relation between the TTI length and the TTI length. The mapping relationship between the TTI length and the transmission period can be expressed as shown in Table 9 below.

[Table 9]

- The base station also provides a mapping relationship between PDCCH monitoring time or frequency resource and TTI length through RRC signaling. It is assumed that the base station allocates UL resources composed of only one TTI length in one PDCCH monitoring time or frequency resource. In this case, the UE checks the PDCCH monitoring time and frequency resources when receiving an UL grant, and can determine the TTI length of the UL resource through the mapping relationship between the TTI length and the TTI length. Details of this will be described in FIGS. 20 and 21. FIG.

(2) The terminal processes the UL grant in the order of the shortest TTI length of the UL resource obtained in the first step.

(3) If there are a plurality of UL grants having the same TTI length of the assigned UL resource, the processing order between them can be determined according to another proposed method of the present invention.

In the same principle, when a terminal receives a plurality of UL grants from a base station, it is also possible to process the UL grant in order of long TTI lengths of allocated resources.

In the following, a specific method for checking the length of the TTI will be described.

18 is a diagram illustrating an example in which a plurality of bandwidth parts in one component carrier according to an exemplary embodiment of the present invention operates resources composed of different TTIs.

The base station may divide the bandwidth of the UL resource into a predetermined number of bandwidth parts and determine a mapping relationship between the bandwidth part and the TTI length. 18 (a), the bandwidth part 1 1810 is mapped to one symbol TTI, the bandwidth part 2 1820 is mapped to one slot TTI, and the bandwidth part 3 1830 is mapped to one subframe Can be mapped to TTI. However, the present invention is not limited to this, and the number of bandwidth parts may be set to two as shown in FIG. 18 (b), or may be set to various numbers, and the length of the TTI may be varied Lt; / RTI &gt; Accordingly, the UE can determine the bandwidth part to which the UL resource is allocated and determine the TTI length corresponding to the bandwidth part.

Further, the embodiment of the present invention is not limited thereto. As described above, the terminal may determine the length of Ta, Tb, or Tc according to the bandwidth part. For example, the length of Ta may be mapped to each bandwidth part, and the terminal may determine Ta corresponding to the bandwidth part to which the UL resource is allocated. The above method can also be applied to determine Tb and Tc.

Also, as described later, the terminal may determine the SCS according to the bandwidth part.

19A to 19C are diagrams illustrating an example in which UL resources having different TTI lengths are allocated at different PDCCH monitoring points according to an embodiment of the present invention.

The BS can distinguish the PDCCH monitoring time point and determine the mapping relationship between the PDCCH monitoring time point and the TTI length. Specifically, referring to FIG. 19 (a), the BS may divide the PDCCH monitoring time into a PDCCH monitoring time 1 (1910) and a PDCCH monitoring time 2 (1920). For example, PDCCH monitoring time 1 1910 may be mapped to one subframe TTI, and PDCCH monitoring time 2 1920 may be mapped to one slot TTI. Therefore, the uplink resource allocated at the PDCCH monitoring time 1 (1910) may have a TTI of 1 subframe length, and the uplink resource allocated at the PDCCH monitoring time 2 (1920) may have a TTI of 1 slot length. Similarly, referring to FIGS. 19B and 19C, PDCCH monitoring time points are respectively determined, and the monitoring time points and TTI lengths can be mapped.

However, the PDCCH monitoring time may be set to various numbers according to the setting of the BS, and the TTI length may be variously mapped according to the PDCCH monitoring time.

Accordingly, the UE can determine the length of the TTI of the uplink resource according to the monitoring time of the PDCCH to which the uplink resource is allocated.

Further, the embodiment of the present invention is not limited thereto. As described above, the UE may determine the length of Ta, Tb, or Tc according to the PDCCH monitoring time. For example, the length of Ta for each PDCCH monitoring time may be mapped, and the UE may determine Ta according to the PDCCH monitoring time at which the UL resource is allocated. The above method can also be applied to determine Tb and Tc.

Also, as described later, the UE may determine the SCS according to the PDCCH monitoring time.

20 is a diagram illustrating an example in which UL resources having different TTI lengths are allocated in different PDCCH monitoring time and frequency resources according to an embodiment of the present invention.

The BS can classify the PDCCH monitoring time into time and frequency resources and determine the mapping relationship between the time and frequency resources of the PDCCH and the TTI length.

20, the BS may divide the PDCCH monitoring time point into the PDCCH monitoring time point 1 (2010) and the PDCCH monitoring point-in-time 2 (2020) according to time and frequency resources. In this case, the time resource and the frequency resource of the PDCCH monitoring time 1 (2010) may be set not to overlap with the time resource and the frequency resource of the PDCCH monitoring time 2 (2020).

At this time, for example, the PDCCH monitoring point-in-time 2010 may be mapped to one subframe TTI and the PDCCH monitoring point-in-time 2020 may be mapped to one slot TTI. Therefore, the uplink resource allocated at the PDCCH monitoring point-in-time 1 2010 may have a TTI of 1 subframe length, and the uplink resource allocated at the PDCCH monitoring point-in-time 2020 may have a TTI of 1 slot length.

However, the PDCCH monitoring time may be set to various numbers according to the setting of the BS, and the TTI length may be variously mapped according to the PDCCH monitoring time.

Accordingly, the UE can determine the length of the TTI of the uplink resource according to the PDCCH monitoring time point and the frequency resource to which the uplink resource is allocated.

Further, the embodiment of the present invention is not limited thereto. As described above, the UE may determine the length of Ta, Tb, or Tc according to the time resource and the frequency resource at the PDCCH monitoring time. For example, the length of Ta for each PDCCH monitoring time and frequency resource may be mapped, and the UE may determine Ta according to the PDCCH monitoring time allocated to the UL resource. The above method can also be applied to determine Tb and Tc.

Also, as described later, the UE may determine the SCS according to the time and frequency resources of the PDCCH monitoring time.

FIG. 21 is a diagram illustrating another example in which UL resources having different TTI lengths are allocated in different PDCCH monitoring time and frequency resources according to an embodiment of the present invention.

As shown in FIG. 20, the BS can classify the PDCCH monitoring time into time and frequency resources, and determine the mapping relationship between the time and frequency resources and the TTI length at the PDCCH monitoring time.

Specifically, referring to FIG. 21A, the BS may divide the PDCCH monitoring time into a PDCCH monitoring time 1 2110 and a PDCCH monitoring time 2 2120 according to time and frequency resources. In this case, the frequency resources of the PDCCH monitoring point-in-time 2110 are not overlapped with the frequency resources of the PDCCH monitoring point-in-time 2120, and the time resources of the PDCCH monitoring point-in- As shown in FIG.

At this time, for example, PDCCH monitoring time 1 2110 may be mapped to 1 subframe TTI and PDCCH monitoring time 2 2120 may be mapped to 1 slot TTI. Accordingly, the uplink resource allocated at the PDCCH monitoring point-in-time 2110 may have a TTI of 1 subframe length, and the uplink resource allocated at the PDCCH monitoring point-in-time 2120 may have a TTI of 1 slot length. The above contents can also be confirmed in the same manner in Fig. 21 (b).

However, the PDCCH monitoring time may be set to various numbers according to the setting of the BS, and the TTI length may be variously mapped according to the PDCCH monitoring time.

For example, the base station can use a method of mapping the period of the PDCCH monitoring point and the length of the TTI, and the UE can determine the TTI length of the uplink resource according to the period of the PDCCH monitoring point to which the uplink resource is allocated .

Accordingly, the UE can determine the length of the TTI of the uplink resource according to the time resource and the frequency resource of the PDCCH monitoring time point to which the uplink resource is allocated.

Further, the embodiment of the present invention is not limited thereto. As described above, the UE may determine the length of Ta, Tb, or Tc according to the time resource and frequency resource of the PDCCH monitoring time or the period of the PDCCH monitoring time. For example, the time and frequency resources of each PDCCH monitoring point, or the length of Ta for the period of the PDCCH monitoring point may be mapped, and the terminal may determine Ta according to the PDCCH monitoring point to which the UL resource is allocated. The above method can also be applied to determine Tb and Tc.

Also, as described later, the UE may determine the SCS according to the time and frequency resources of the PDCCH monitoring time or the period of the PDCCH monitoring time.

<Example 4-4>

Radio resources are represented by a combination of resources on the time axis and resources on the frequency axis. Where the resources on the time axis can be represented equally by a multiple of the symbol length and the resources on the frequency axis can be represented equally by a multiple of the subcarrier spacing. Therefore, even if resources on the time axis are allocated in a small amount, the amount of radio resources used for transmission and reception increases when resources on the frequency axis are allocated. Also, even if resources on the frequency axis are allocated in a small amount, the amount of radio resources used for transmission and reception increases when resources on the time axis are allocated.

It is assumed that a UE receives a plurality of UL grants at the same time. If the amount of allocated radio resources is large in order to process the UL grant, the UE can transmit traffic existing in its buffer to the base station using as few UL grants as possible. In this case, the UE can reduce the UL grant processing overhead.

On the other hand, if the UL grant is processed in the order of less allocated radio resources, the UE transmits the traffic in its buffer to the base station using as many UL grants as possible. In this case, the UL grant processing overhead is increased.

In the present invention, when a terminal receives a plurality of UL grants from a base station, it proposes a method of processing UL grants in descending order of the amount of allocated radio resources. This is explained as follows.

The UE shall check the amount of radio resources allocated after receiving the UL grant.

- The amount of radio resources allocated here can be expressed by the number of RBs (Resource Blocks), the number of REs (Resource Elements), or the number of objects corresponding to other basic units of resource allocation.

- The amount of allocated radio resources may also be represented by the number of bits of information that the terminal can send through the resource.

(2) The terminal handles the UL grant in ascending order of the amount of radio resources identified in the first step.

If there is a plurality of UL grants having the same amount of resource allocated from the BS in step 2, the processing order between them can be determined according to another proposed method of the present invention.

In the same principle, when a terminal receives a plurality of UL grants from a base station, a method of processing UL grants in the order of a smaller amount of allocated radio resources is also possible.

&Lt; Example 4-5 >

In the present invention, when a terminal receives a plurality of UL grants from a base station, the terminal proposes a method of processing UL grants in random order. An example of this is as follows.

(1) The UE shall check the number of UL grants allocated (or simultaneously processed) after receiving UL grants. If the number of allocated UL grants is N, the terminal selects and assigns an arbitrary number from 1 to N to each UL grant. In this process, different UL grants are not given the same number.

(2) The terminal handles UL grants in the order that the number assigned to each UL grant is small (or large).

<Examples 4-6>

The NR system supports multiple subcarrier spacing (SCS). For example, a UL resource allocated to a UE may be used to transmit a signal having one of SCSs of 15, 30, 60, and 120 kHz. In the present invention, when a terminal receives a plurality of UL grants from a base station, the terminal proposes a method of processing UL grants in the order set based on the SCS. An example of this is as follows.

① The UE confirms the SCS to be used in the resources allocated after receiving the UL grant.

- The base station may include the SCS in the DCI to inform the terminal exactly which SCS it should use in the UL resource.

- In addition, the DCI specifies the profile ID of the UL resource allocated to the UE by the BS, and the BS provides the mapping relationship between the profile ID and the SCS through RRC signaling. If the UE receives the UL grant, the UE can confirm the profile ID through the DCI and grasp the SCS of the UL resource through the mapping relationship between the profile ID and the SCS.

- The base station also provides the mapping relationship between DCI format and SCS through RRC signaling. If the UE receives the UL grant, the UE can check the DCI format and determine the SCS of the UL resource through the mapping relationship between the DCI format and the SCS.

- The base station also provides the mapping relationship between the bandwidth part and the SCS with the UL resource allocated through RRC signaling. In this case, the UE can identify the bandwidth part of the UL resource allocated to the UL grant and grasp the SCS of the UL resource through the mapping relationship between the bandwidth part and the SCS. As a specific method, a method similar to that described in Fig. 18 can be used.

- The base station also provides the mapping relationship between the PDCCH monitoring point and the SCS through RRC signaling. This assumes that the BS allocates UL resources composed of only one SCS at the time of one PDCCH monitoring. In this case, the UE can recognize the SCS of the UL resource through the mapping relationship between the PDSCH and the SCS when the UE receives the UL grant.

- The base station also provides the mapping relationship between the PDCCH monitoring cycle and the SCS through the RRC signaling. It is assumed that the BS allocates UL resources composed of only one SCS in the PDCCH transmitted in a specific period. If the UE receives the UL grant, the UE can check the monitoring cycle of the corresponding PDCCH and determine the SCS of the UL resource through the mapping relationship between the PDSCH and the SCS.

- The base station also provides PDCCH monitoring time or mapping relationship between frequency resources and SCS through RRC signaling. This assumes that the base station allocates UL resources composed of only one SCS in one PDCCH monitoring time or frequency resource. If the UE receives the UL grant, the UE can check the PDCCH monitoring time and frequency resources and grasp the SCS of the UL resource through the mapping relationship between the PDSCH and the SCS.

The method of using the time or frequency resource at the PDCCH monitoring point or the monitoring point may be similar to the method described with reference to FIG. 19 to FIG.

The UE processes the UL grant in ascending order of the SCS used in the UL resource identified in the first step. As another example, the UE may process the UL grant in descending order of the SCS used in the UL resource. As another example, the UE may process the UL grant in the order of the SCS informed by the base station through RRC signaling.

(2) If there are a plurality of UL grants having the same SCS used in the allocated UL resource, the processing order between them can be determined according to another proposed method of the present invention.

<Examples 4-7>

In the NR system, the UE may be configured to monitor one or more time and frequency resources in order to receive a PDCCH, which is a control channel including UL resource allocation information and the like. The details are described in Fig.

22 is a diagram illustrating an example in which different PDCCH monitoring time and frequency resources are set in different bandwidth parts according to an embodiment of the present invention.

Referring to FIG. 22, if a plurality of PDCCH monitoring resources are periodically set in the UE, the UE may be required to monitor a plurality of PDCCHs at a specific time. Specifically, the BS may divide the system bandwidth into a bandwidth part and set the PDCCH monitoring time at different intervals according to the bandwidth part. At this time, if more than one PDCCH includes resource allocation information for the corresponding UE, the UE should determine which PDCCH included in the PDCCH should be processed first.

The present invention proposes a method for a terminal to process an UL grant according to a PDCCH monitoring time and a period of a frequency resource when a terminal receives a plurality of UL grants from the base station. This is explained as follows.

The UE confirms the PDCCH monitoring time and frequency resource period after detecting the UL grant after receiving the UL grant. At this time, the BS can provide PDCCH monitoring time and frequency resource allocation information to the UE through RRC signaling.

(2) The UE processes the UL grant in the order of the shortest period of the PDCCH monitoring resources identified in the first step. As another example, the UE may process the UL grant in order of long periods of the PDCCH monitoring resources that detected the UL grant.

(3) If there are a plurality of UL grants having the same period of the PDCCH monitoring resource that detects the UL grant in step 1, the processing order between them can be determined according to another proposed method of the present invention.

22, for example, the period of the PDCCH monitoring resource 2215 of the bandwidth part 1 2210 is the longest and the period of the PDCCH monitoring resource 2235 of the bandwidth part 3 2230 is the shortest. Therefore, according to the embodiment of the present invention, the UE can process the control information received through the PDCCH monitoring resource of the bandwidth part 1 (2210) latest. Alternatively, according to another embodiment of the present invention, the UE may first process the control information received through the PDCCH monitoring resource of the bandwidth part 1 2210.

<Examples 4-8>

The NR system is designed to operate in a plurality of frequency bands having different propagation characteristics. For example, in a frequency band of 6 GHz or less in which a 2G / 3G / 4G system is operating and a frequency band of 6 GHz or more in which transmission and reception beamforming is required due to a large propagation loss, It is considered to operate in all.

Here, each frequency band may have different characteristics. For example, a frequency band of 6 GHz or higher is advantageous in transmitting large data because the bandwidth is broader than a frequency band of 6 GHz or less, but a loss of a link may occur more frequently due to a large propagation loss. Also, the power consumption of an RF module supporting 6 GHz or lower frequency band and the power consumption of an RF module supporting 6 GHz or higher frequency band may be different from each other.

Therefore, when a terminal receives a plurality of UL grants, the UL grant processing order can be determined based on the frequency to which the allocated UL resource belongs. This is explained as follows.

After receiving the UL grant, the UE confirms the frequency band including the allocated resources through the corresponding UL grant, that is, the carrier frequency or the component carrier.

② The terminal handles the UL grant in the order of the lowest carrier frequency observed in the first step.

- However, as another example, the UE may process the UL grant in order of the carrier frequency of the allocated UL resource.

- As another example, the terminal may process the UL grant in the carrier frequency order that the base station informed through RRC signaling.

As another example, the UE may process the UL grant allocated through the component carrier set in the primary cell (PCell) first, and then process the UL grant allocated later through the component carrier set in the secondary cell (SCell).

- In another example, the terminal may process the UL grant assigned to the component carrier of the primary cell (PCell) first and then the UL grant assigned to the component carrier of the secondary cell (SCell) later.

If there is a metric derived by the UE in step 1, that is, a plurality of UL grants allocated through the same frequency band, the order of processing between them can be determined according to another proposed method of the present invention.

<Examples 4-9>

In the NR system, a terminal can use a plurality of services having different characteristics at the same time. For example, a UE can use a logical channel for an eMBB service requiring high throughput and a logical channel for a URLLC service requiring low latency and high reliability. In this case, when a traffic to be transmitted is generated in a logical channel for eMBB or a logical channel for URLLC, the UE may transmit a scheduling request signal to the base station according to a scheduling request procedure. If the base station receives a scheduling request signal from the terminal, the base station can allocate an UL grant to the terminal and provide an opportunity to transmit the generated traffic to the terminal.

In this case, when the terminal receives an UL grant, it must be able to determine which logical channel should be transmitted using the allocated UL grant. This is because the characteristics of UL grants suitable for transmitting the traffic belonging to each service used by the UE may be different from each other.

For example, when transmitting traffic originating from a logical channel for eMBB, it is appropriate to use UL grant with 15 kHz SCS and 0.5 ms TTI. When transmitting traffic originating from a logical channel for URLLC, 30 kHz SCS and 0.25 ms TTI Lt; RTI ID = 0.0 &gt; UL &lt; / RTI &gt; If the UE uses a UL resource that is suitable for transmission of eMBB traffic, ie, 15 kHz SCS and 0.5 ms TTI, in order to transmit traffic originating from a logical channel for URLLC, the requirements of the URLLC service may not be satisfied.

Accordingly, the present invention proposes a method of grasping a physical property of an UL grant allocated to a terminal when a terminal receives an UL grant from a base station, and a method of confirming a logical channel that can be transmitted through an allocated UL grant.

First, the UE can grasp the physical characteristics of the allocated UL grant, for example, the SCS and the TTI length, and grasp a logical channel suitable for transmission through resources having the physical characteristics. The terminal according to this method will be described in detail with reference to FIG.

23 is a view for explaining a method of determining a physical characteristic of the UL grant after the UE receives an UL grant and then selecting an LCH that can be transmitted through the allocated UL grant according to an embodiment of the present invention.

Referring to FIG. 23, the terminal can receive an UL grant in step S2310. In step S2320, the UE can confirm the physical property information of the UL grant. At this time, the physical property information of the UL grant may include the above-described SCS and TTI length. In addition, the physical property information of the UL grant may include at least one of the physical property information described above.

In step S2330, the terminal can select the LCH based on the physical property information.

At this time, various methods can be used for the terminal to confirm the physical property information of the UL grant and to select the LCH according to the characteristic information, and a specific method is as follows.

● Method A1

- The terminal can use the method A1 in step S2311. The method A1 is a method in which the BS includes the SCS and the TTI length and transmits the DCI to the UE so that the UE can grasp the physical property information of the UL grant. An example of this is shown in Table 10 below. Therefore, the UE can grasp the SCS and the TTI length of the allocated resource when receiving the UL grant.

[Table 10]

In addition, the BS informs the MS of a list of logical channels that can be transmitted through a resource having a specific SCS and TTI length. Such information can be transmitted through RRC signaling or the like. An example of this is shown in Table 11 below.

[Table 11]

Accordingly, the UE recognizes the physical property information (SCS and TTI length) of the UL grant allocated through the information specified in the DCI, and transmits a logical channel that can be transmitted using the UL grant having the physical characteristics through RRC signaling Select. After performing LCP (Logical Channel Prioritization) operation on the selected logical channel, UL transmission is performed.

This method has the advantage of being relatively simple to implement by directly adding information about SCS and TTI length to the DCI, but the information to be included in the DCI can be increased.

● Method A2

- The terminal can use method A2.

Specifically, the terminal checks the bandwidth part to which the UL resource allocated in step S2312 belongs.

- The base station uses one physical characteristic in a specific bandwidth part, for example, one SCS and TTI length, and informs the terminal of the information through RRC signaling. An example of this is shown in Table 12 below. Therefore, the terminal can check the physical characteristics corresponding to the bandwidth part.

[Table 12]

- The base station informs the terminal of a list of logical channels that can be transmitted through resources comprising specific physical characteristics information (e.g., SCS and TTI length). Such information can be transmitted through RRC signaling or the like. An example of this is shown in Table 13 below.

[Table 13]

- The UE recognizes the physical property information (eg, SCS and TTI length) of the allocated UL grant through the bandwidth part information to which the allocated UL resource belongs, and uses the UL grant having the corresponding physical property through RRC signaling And selects a logical channel that can be transmitted. After performing LCP (Logical Channel Prioritization) operation on the selected logical channel, UL transmission is performed.

● Method A3

- The terminal can use method A3.

Specifically, in step S2313, the UE checks the time and frequency resources of the PDCCH allocated with the UL grant or the PDCCH monitoring time.

- The base station uses one physical characteristic, for example, one SCS and TTI length, for the UL resource allocated at the PDCCH of a specific time and frequency resource or at a specific PDCCH monitoring point, and transmits information related thereto to the UE through RRC signaling It informs. An example of this is shown in Table 14 below. Accordingly, the UE can confirm the physical characteristics of the UL resource corresponding to the PDCCH of the specific time and frequency resources or the specific PDCCH monitoring time.

[Table 14]

- The base station informs the terminal of a list of logical channels that can be transmitted through resources comprising specific physical characteristics information (e.g., SCS and TTI length). Such information can be transmitted through RRC signaling or the like. An example of this is shown in Table 15 below.

[Table 15]

- The MS grasps the physical property information (eg, SCS and TTI length) of the UL grant allocated through the time and frequency resources of the PDCCH on which the UL grant is transmitted or the PDCCH monitoring time information, Select a logical channel that can be transmitted using UL grants. After performing LCP (Logical Channel Prioritization) operation on the selected logical channel, UL transmission is performed.

● Method A4

- The terminal can use method A4.

Specifically, in step S2314, the UE checks the DCI format used for UL resource allocation of the BS.

- The base station uses one physical property, for example, one SCS and TTI length, for the UL resource allocated through a specific DCI format and informs the UE of the information through RRC signaling. An example of this is shown in Table 16 below. Accordingly, the UE can confirm the physical characteristics of the UL resource corresponding to the DCI format.

[Table 16]

- The base station informs the terminal of a list of logical channels that can be transmitted through resources comprising specific physical characteristics information (e.g., SCS and TTI length). Such information can be transmitted through RRC signaling or the like. An example of this is shown in Table 17 below.

[Table 17]

The MS grasps the physical property information (e.g., SCS and TTI length) of the UL grant allocated through the DCI format used for UL resource allocation and uses the UL grant having the corresponding physical property through RRC signaling Select the logical channels that can be transmitted. After performing LCP (Logical Channel Prioritization) operation on the selected logical channel, UL transmission is performed.

As described above, in the case of the method A2 / A3 / A4, one bandwidth part, one PDCCH time and frequency resource (or one PDCCH monitoring time), and one physical format information (SCS and TTI length) There is a restriction that UL resources should be allocated. However, there is an advantage that the number of bits included in the DCI is not increased because there is no need to directly add information about the SCS and the TTI length to the DCI as in the method A1.

So far, we have proposed a method of selecting the logical channel suitable for transmission through the UL grant with the physical characteristics in the second step, by grasping the physical characteristics of the UL grant allocated to the UE through the two steps.

Next, instead of performing two steps, the UE performs only one step and selects a logical channel suitable for transmission through the allocated UL grant. The specific operation of the terminal according to this method will be described with reference to FIG.

24 is a diagram illustrating a method of selecting an LCH that can be transmitted through an UL grant after a terminal receives an UL grant according to an embodiment of the present invention.

Referring to FIG. 24, the terminal may receive an UL grant in step S2410. Then, the terminal can select the LCH in step S2420.

At this time, various methods can be used for the UE to receive the UL grant and select the LCH, and a specific method is as follows.

● Method B1

- The terminal can use the method B1 in step S2411

The method B 1 specifically includes a list of LCH IDs that can be transmitted through the corresponding UL grant to the DCI in order to inform the UE of the LCH that the UE can transmit through the UL grant. An example of this is shown in Table 18 below. Therefore, when the UE receives the UL grant, it can grasp the LCH that can be transmitted through the corresponding UL grant.

[Table 18]

Therefore, the UE recognizes the LCH that can be transmitted through the allocated UL grant through the information included in the DCI, performs the LCP operation on the LCH, and performs the UL transmission.

This method has the advantage of being relatively simple to implement by directly adding LCH information that can be transmitted to the DCI, but the information to be included in the DCI increases.

● Method B1 '

- Alternatively, the terminal can use method B1 '.

The method B1 'is a method in which a base station transmits an LCH set including an ID of a LCH set that can be transmitted through a corresponding UL grant to a DCI to inform the terminal of an LCH that can be transmitted through the corresponding UL grant. An example of this is shown in Table 19 below. Herein, the base station can notify the terminal of RRC signaling, etc., of a group of LCHs constituting the LCH set.

[Table 19]

- As described above, the BS can inform the UE of the list of LCHs belonging to each LCH set. Such information can be transmitted through RRC signaling or the like. Specifically, each LCH set can be divided into an identifier, and the base station can provide the terminal with an LCH list including an LCH set identifier and a set corresponding to the identifier through RRC signaling or the like. An example of this is shown in Table 20 below.

[Table 20]

 Therefore, the UE can confirm the ID of the LCH set that can be transmitted through the allocated UL grant based on the information included in the DCI. Then, the UE checks the LCH set corresponding to the LCH set ID included in the UL grant through RRC signaling. Then, the LCP operation is performed on the logical channel thus confirmed and the UL transmission is performed.

- This method has the advantage that the information to be included in the DCI is reduced rather than directly including the LCH list in the DCI.

● Method B2

- The terminal can use method B2.

Specifically, the terminal checks the bandwidth part to which the UL resource allocated in step S2412 belongs.

- The base station informs the terminal about the LCH list that can be transmitted and received within a specific bandwidth part through RRC signaling. An example of this is shown in Table 21 below.

[Table 21]

- The UE checks the LCH that can be transmitted through the assigned UL grant through the bandwidth part information to which the assigned UL resource belongs and the correspondence information between the bandwidth part and the LCH provided through the RRC signaling. Then, after performing the LCP operation on the LCHs thus confirmed, UL transmission is performed.

● Method B3

- The terminal can use method B3.

Specifically, in step S2413, the UE checks the time and frequency resources of the PDCCH allocated with the UL grant or the PDCCH monitoring time.

- The base station informs the terminal about the LCH list that can be transmitted and received through the UL resource allocated at the PDCCH of specific time and frequency resources or at the specific PDCCH monitoring time through RRC signaling. An example of this is shown in Table 22 below.

[Table 22]

The UE checks the logical channel that can be transmitted using the allocated UL grant through the time and frequency resources of the PDCCH on which the UL grant is transmitted or the PDCCH monitoring occasion information and the LCH information provided through the RRC signaling. Then, the LCP (Logical Channel Prioritization) operation is performed on the logical channel thus confirmed, and the UL transmission is performed.

● Method B4

- The terminal can use method B4.

Specifically, in step S2414, the terminal checks the DCI format used for UL resource allocation of the base station.

- The base station informs the terminal about the LCH information that can be transmitted through the allocated UL resource through the specific DCI format through the RRC signaling. An example of this is shown in Table 23 below.

[Table 23]

- The UE checks the logical channel that can be transmitted using the assigned UL grant through the DCI format used for UL resource allocation and the LCH information that can be transmitted using the allocated resources through each DCI format. Then, the LCP (Logical Channel Prioritization) operation is performed on the logical channel thus confirmed, and the UL transmission is performed.

In the case of the method B2 / B3 / B4, there is a restriction that a predetermined LCH must be transmitted / received through one bandwidth part, one PDCCH time and frequency resource (or one PDCCH monitoring point) and one DCI format. However, there is an advantage that the number of bits included in the DCI is not increased because there is no need to directly add the LCH-related information to the DCI as in the method B1.

In the present invention, a method of grasping the SCS and the TTI length of the UL resource allocated by the UE has been proposed. However, the method proposed by the present invention can be applied to the same principle to grasp not only the SCS and TTI length but also various parameters such as CP length and transmission duration.

In the present invention, an example of a method for the MS to identify the SCS and the TTI length in pairs has been described. However, the UE may identify the SCS in a specific manner and independently of the TTI length in a manner different from the method of determining the SCS.

For example, when the terminal uses one of the above-described method A1, method A2, method A3, and method A4 in order to grasp the SCS, and the method B1, method B2, method B3, method B4 may be used. In this example, the case where the terminal grasps the SCS and the TTI length has been described. However, the present invention is not limited to this and can be applied to finding a combination of various parameters. For example, the method proposed in the present invention may be used to find a combination of SCS and transmission duration.

Also, the contents of FIGS. 23 and 24 may be applied to the entire content of the present invention, and may be applied to, for example, a method of determining a parameter for determining the processing order of the UL grant.

<Fifth Embodiment>

The general UL scheduling procedure is as follows.

1) The BS allocates a resource to transmit a Scheduling Request (SR) to the UE, that is, a PUCCH.

2) The terminal transmits an SR to the BS when a traffic to be transmitted occurs according to a predefined Buffer Status Report (BR) and an SR procedure.

3) After receiving the SR, the BS allocates a resource to transmit data to the MS, that is, a PUSCH.

4) The terminal transmits data through the resources allocated from the base station.

In the 5G system or the NR system, a grant-free (GF) transmission method is introduced along with this general UL scheduling procedure. The GF transmission procedure is as follows.

1) The BS allocates resources to transmit data to the MS. This can be regarded as an operation similar to SPS (Semi-Persistent Scheduling) in which the BS allocates resources in advance to the UE before the traffic occurs, instead of allocating resources to the UEs when the traffic occurs, such as general UL scheduling .

A. The BS allocates resources for GF transmission to the UE as follows.

I) The base station informs the terminal of the GF transmission resource through the RRC configuration.

Ii) The base station notifies the UE of the GF transmission resource candidate through the RRC configuration and informs the actual GF transmission resource through L1 signaling such as PDCCH.

B. The information that the base station informs when allocating GF resources to the UE may include the following:

I) Periodicity and offset of a resource with respect to SFN = 0

Ⅱ) Time domain resource allocation

Iii) Frequency domain resource allocation

Iv) UE-specific DMRS configuration

V) An MCS / TBS value

Vi) Number of repetitions K

Ⅶ) Power control related parameters

Ⅷ) HARQ related parameters

Ⅸ) Offset associated with the periodicity with respect to a timing reference indicated by L1 signaling for activation

2) A terminal that has been allocated resources for GF transmission in step 1 can perform transmission through the corresponding resources when traffic occurs.

The advantage of this GF transmission method is that it can reduce the time it takes for the terminal to transmit the SR to the base station, the time it takes for the terminal to receive the UL grant from the base station, and the processing time associated therewith. Therefore, when a terminal using a plurality of services is generally allocated a UL resource for GF transmission from a base station, it can transmit traffic requiring low delay such as URLLC rather than traffic allowing a long delay such as eMBB It is advantageous to transmit it.

The GF transmission method has a low delay compared to the general UL scheduling, and is capable of allocating the same GF transmission resources to a plurality of terminals. When allocating a GF transmission resource to a UE, the Node B sets up a demodulation reference signal (DM-RS) set for the specific UE together with time and frequency resource information, MCS, HARQ, and power control information of the GF resource configuration.

Herein, the BS allocates the same GF transmission resources to a plurality of MSs and allocates different DMRS configurations to the MSs. In this case, even if a plurality of UEs perform transmission in the same resource, the Node B can determine which UE has performed transmission through the characteristics of the received DM-RS. In addition, the base station can improve data reception performance or instruct retransmission. Whether or not the base station can successfully receive data when a plurality of UEs perform transmission in the same resource depends on the performance of the physical layer. That is, according to the detailed design of the physical layer for GF transmission, when a plurality of UEs perform transmission in the same resource, the base station may or may not successfully receive the data.

So far, we have examined the characteristics of the GF transmission method as follows.

(1) avoidance of delay for SR and UL grant transmission and reception

(2) Assignment of the same GF transmission resource to a plurality of terminals

(3) Depending on the detailed design of the physical layer for GF transmission, transmission and reception performance may be degraded.

Here, it is assumed that a plurality of services, for example, eMBB and URLLC are simultaneously used. According to the characteristic (1) described above, when the UE receives the GF transmission resource from the base station, it transmits the URLLC data requesting a low delay.

However, according to the characteristic (2), the GF transmission resource allocated to the terminal may be allocated not only to the terminal but also to other terminals. According to the characteristic (3), when a plurality of terminals perform GF transmission in the same resource, the data reception performance of the base station may be degraded. In this case, it is not suitable for the terminal to transmit the URLLC data to the GF resource allocated from the base station. This is because it may not satisfy the requirements of the reliability of the URLLC service, that is, the error rate and delay.

Therefore, the present invention proposes the operation shown in FIG. 25 as follows.

25 is a diagram illustrating a method of transmitting uplink data according to an embodiment of the present invention.

The base station provides logical channel configuration information for each logical channel to the mobile station in step S2510. This can be done via RRC signaling.

The logical channel configuration information of the present invention may include at least one of the following information.

1) Whether the traffic belonging to the logical channel can be transmitted through the GF transmission resource (called GrantFreeAllowed)

2) Whether traffic belonging to the logical channel can be transmitted through a GF transmission resource allocated only to one UE (called GrantFreeDedicatedAllowed)

3) Whether traffic belonging to the logical channel can be transmitted through GF transmission resources allocated to multiple terminals (called GrantFreeSharedAllowed)

In step S2520, the BS allocates a GF transmission resource to the MS. The GF transmission resource may be included in the grant-free resource configuration information, and may be transmitted to the UE through RRC signaling.

The grant free resource configuration information for allocating the GF transmission resource of the present invention may include at least one of the following information.

1) Whether the corresponding GF transmission resource is allocated to only one UE or multiple UEs (named GrantFreeShared)

2) The number of terminals (corresponding to NumGrantFreeShared) allocated the corresponding GF transmission resource.

The UE has acquired an opportunity to perform UL transmission through the GF transmission resource allocated from the base station.

Accordingly, the terminal can confirm the grant-free resource in step S2530.

Then, the terminal can confirm the logical channel allowed in step S2540. The UE selects a logical channel to be transmitted through the GF transmission resource based on the information confirmed through the logical channel configuration and the information confirmed through the grant free resource configuration.

A. If GrantFreeShared or NumGrantFreeShared information is not given in step S2520, the terminal selects a logical channel GrantFreeAllowed in step S2530.

B. If GrantFreeShared information or NumGrantFreeShared information is given in step S2520, the UE operates as follows.

I) If the GrantFreeShared obtained in step S2520 is true (meaning that the corresponding GF transmission resource is shared by a plurality of UEs), or if NumGrantFreeShared is greater than 1, the UE selects a logical channel GrantFreeAllowed or GrantFreeSharedAllowed acquired in step 1.

Ii) If GrantFreeShared obtained in step S2520 is False (meaning that the corresponding GF transmission resource is allocated to only one UE) or if NumGrantFreeShared is 1, the UE selects a logical channel GrantFreeDedicatedAllowed in step 1.

The MS performs an LCP operation on the logical channel selected in operation S2550. In step S2560, the terminal transmits the packet generated through the LCP operation through the GF transmission resource.

The present invention also proposes the operation shown in Fig. 26 as follows.

26 is a diagram illustrating another method of transmitting uplink data according to an embodiment of the present invention.

In step S2610, the BS provides logical channel configuration information for each logical channel to the MS. This can be done via RRC signaling.

In step S820, the BS allocates a GF transmission resource to the UE. The GF transmission resource may be included in the grant-free resource configuration information, and may be transmitted to the UE through RRC signaling.

A. In the present invention, grant free resource configuration information for allocating GF transmission resources may include at least one of the following information.

1) Whether the corresponding GF transmission resource is allocated to only one UE or multiple UEs (named GrantFreeShared)

2) The number of terminals (corresponding to NumGrantFreeShared) allocated the corresponding GF transmission resource.

B. In addition, in the present invention, grant free resource configuration information for allocating GF transmission resources shall include the following.

1) List of LCHs that can be transmitted through the corresponding GF transmission resource

2) an LCH list that can be transmitted when the corresponding GF transmission resource is allocated to only one UE

3) an LCH list that can be transmitted when a corresponding GF transmission resource is allocated to a plurality of terminals

The UE has acquired an opportunity to perform UL transmission through the GF transmission resource allocated from the base station.

Accordingly, the UE can confirm the grant-free resource in step S2630.

Then, the terminal can confirm the logical channel allowed in step S2640. The UE selects a logical channel to transmit based on the information confirmed in grant free resource configuration.

A. If no GrantFreeShared information or NumGrantFreeShared information is given, the UE selects the LCH included in the LCH list that can be transmitted through the corresponding GF transmission resource.

B. If GrantFreeShared information or NumGrantFreeShared information is given, the terminal behaves as follows.

I) If GrantFreeShared is true (meaning that the corresponding GF transmission resource is shared to a plurality of UEs), or if NumGrantFreeShared is greater than 1, the UE transmits an LCH list which can be transmitted when the corresponding GF transmission resource is allocated to a plurality of UEs Quot; LCH &quot;

Ⅱ) If GrantFreeShared is False (meaning that the GF transmission resource is allocated to only one UE) or NumGrantFreeShared is 1, the UE transmits the GF transmission resource included in the LCH list which can be transmitted when the corresponding GF transmission resource is allocated only to one UE Select LCH.

The MS performs an LCP operation on the logical channel selected in step S2650. In step S2660, the terminal transmits the packet generated through the LCP operation through the GF transmission resource.

The present invention proposes the operation shown in FIG. 27 as follows.

FIG. 27 is a diagram illustrating another method of transmitting uplink data according to an embodiment of the present invention. Referring to FIG.

In step S2710, the BS provides logical channel configuration information for each logical channel to the MS. This can be done via RRC signaling.

In the present invention, the logical channel configuration information may include at least one of the following information.

1) Whether the traffic belonging to the logical channel can be transmitted through the GF transmission resource (called GrantFreeAllowed)

2) Whether traffic belonging to the logical channel can be transmitted through a GF transmission resource allocated only to one UE (called GrantFreeDedicatedAllowed)

3) Whether traffic belonging to the logical channel can be transmitted through GF transmission resources allocated to multiple terminals (called GrantFreeSharedAllowed)

In step S2720, the BS allocates GF transmission resources to the MS. The GF transmission resource may be included in the grant-free resource configuration information, and may be transmitted to the UE through RRC signaling.

A. Also, in the present invention, grant free resource configuration information for allocating GF transmission resources may include at least one of the following information.

1) List of LCHs that can be transmitted through the corresponding GF transmission resource

2) an LCH list that can be transmitted when the corresponding GF transmission resource is allocated to only one UE

3) an LCH list that can be transmitted when a corresponding GF transmission resource is allocated to a plurality of terminals

B. Here, the information included in step S2710 and the information included in step S2720 indicate the same information. Therefore, the present invention can operate even if only one of them is included. In this example, it is assumed that the corresponding information is transmitted in step S2710.

The base station activates the GF transmission resources allocated to the UE in step S2730. This can be done through L1 signaling such as DCI.

In the present invention, the base station may include at least one of the following information in the DCI for activating the GF transmission resource.

1) Whether only one terminal or multiple terminals are allocated to the activated GF transmission resource

2) the number of terminals allocated to the activated GF transmission resource

Accordingly, the terminal can confirm the grant-free resource in step S2740.

Then, the terminal can confirm the logical channel allowed in step S2750. The terminal selects a logical channel to transmit through the GF transmission resource based on the information confirmed through the logical channel configuration and the information confirmed through the DCI for activating the GF transmission resource.

A. If no information is given such as whether only one terminal is assigned to the activated GF transmission resource in step S2730, a plurality of terminals are allocated, or the number of terminals allocated to the activated GF transmission resource, Select the logical channel GrantFreeAllowed that you identified in

B. If this information is given in step S2730, the terminal operates as follows.

I) If a plurality of terminals are allocated to the activated GF transmission resource, the terminal selects a logical channel, GrantFreeAllowed or GrantFreeSharedAllowed,

Ii) If only one UE is allocated to the activated GF transmission resource, the UE selects a logical channel, GrantFreeDedicatedAllowed,

The terminal performs an LCP operation on the logical channel selected in step S2760. In step S2770, the terminal transmits the packet generated through the LCP operation through the GF transmission resource.

The present invention proposes the operation shown in FIG. 28 as follows.

28 is a diagram illustrating another method of transmitting uplink data according to an embodiment of the present invention.

The base station provides logical channel configuration information for each logical channel to the mobile station in step S2810. This can be done via RRC signaling.

The logical channel configuration information of the present invention may include the following.

1) Profile ID corresponding to each logical channel

The base station allocates GF transmission resources to the UE in step S2820. The GF transmission resource may be included in the grant-free resource configuration information, and may be transmitted to the UE through RRC signaling.

The base station activates the GF transmission resources allocated to the UE in step S2830. This can be done through L1 signaling such as DCI.

In the present invention, the following information may be included in the DCI for activating the GF transmission resource by the base station.

1) profile ID of activated GF transmission resource

Accordingly, the MS can confirm the grant-free resource in step S2840.

Then, the terminal can confirm the logical channel allowed in step S2850. The UE selects a logical channel to be transmitted through the GF transmission resource based on the information confirmed through the logical channel configuration and the information confirmed through the DCI for activating the GF transmission resource

A. That is, if the terminal confirms the active profile ID through the DCI received in step S2830, the terminal selects a logical channel corresponding to the profile ID through the logical channel configuration received in step S2810.

The MS performs an LCP operation on the logical channel selected in step S2860. In step S2870, the terminal transmits the packet generated through the LCP operation through the GF transmission resource.

25 through 28 correspond to examples of the method proposed by the present invention, and combinations thereof are also considered to fall within the scope of the present invention.

FIGS. 25, 26, 27 and 28 illustrate operations of the base station and the terminal with respect to the GF transmission resources allocated to the terminal by the base station. This operation can be similarly applied to the SPS resources allocated to the UE by the BS. An example of this is as follows.

1. The BS provides logical channel configuration information for each logical channel to the MS. This is done through RRC signaling.

A. In the present invention, the logical channel configuration information may include the following information.

1) Whether the traffic belonging to the logical channel can be transmitted through the SPS resource (named SPSAllowed)

2. The base station allocates SPS resources to the UE. This is done through RRC signaling.

3. The UE acquires the opportunity to perform UL transmission through the SPS resource allocated from the BS.

4. The terminal selects the logical channel to be transmitted through the SPS resource using the information obtained through the logical channel configuration in the first step.

A. To do this, the terminal selects a logical channel with SPSAllowed True, as described in step 1, and does not select a logical channel with SPSAllowed false.

5. The terminal performs the LCP operation on the logical channel selected in the step 4.

6. The terminal transmits the packet generated through the LCP operation through the SPS resource.

Another example related to this is as follows.

1. The BS provides logical channel configuration information for each logical channel to the MS. This is done through RRC signaling.

2. The base station allocates SPS resources to the UE. This is done through RRC signaling.

A. In the present invention, SPS resource configuration information for allocating SPS resources includes the following.

1) List of LCHs that can be transmitted through the corresponding SPS resource

3. The UE acquires the opportunity to perform UL transmission through the SPS resource allocated from the BS.

4. The terminal selects the logical channel to be transmitted through the SPS resource using the information obtained through the SPS resource configuration in step 2.

A. To do this, the terminal selects a logical channel included in the LCH list that can be transmitted through the corresponding SPS resource described in step 2, and does not select a logical channel that is not included in the LCH list.

5. The terminal performs the LCP operation on the logical channel selected in the step 4.

6. The terminal transmits the packet generated through the LCP operation through the SPS resource.

29 is a diagram illustrating a structure of a terminal according to an embodiment of the present invention.

29, the terminal may include a transmission / reception unit 2910, a control unit 2920, and a storage unit 2930. In the present invention, the control unit may be defined as a circuit or an application specific integrated circuit or at least one processor.

The transmission / reception unit 2910 can transmit and receive signals. The transmission / reception unit 2910 can receive system information from, for example, a base station and can receive a synchronization signal or a reference signal.

The controller 2920 can control the overall operation of the terminal according to the embodiment of the present invention. For example, the controller 2920 may control the signal flow between each block to perform the operation according to the flowcharts described above.

For example, the control unit 2920 may receive the LCH and profile mapping information from the base station and receive the UL grant.

Accordingly, the controller 2920 can select data to be transmitted to the base station based on the profile information included in the UL grant.

Alternatively, the control unit 2920 may receive information on a parameter set from the base station, and may select data to be transmitted to the base station based on the information on the parameter set and the profile information included in the UL grant.

In addition, the control unit 2920 can confirm the profile information by using various methods described above.

The storage unit 2930 may store at least one of information transmitted and received through the transceiver 2910 and information generated through the controller 2920.

30 is a diagram illustrating a structure of a base station according to an embodiment of the present invention.

Referring to FIG. 30, the base station may include a transmission / reception unit 3010, a control unit 3020, and a storage unit 3030. In the present invention, the control unit may be defined as a circuit or an application specific integrated circuit or at least one processor.

The transmission / reception unit 3010 can transmit and receive signals. The transmission / reception unit 3010 can transmit system information to the terminal, for example, and can transmit a synchronization signal or a reference signal.

The controller 3020 can control the overall operation of the base station according to the embodiment of the present invention. For example, the controller 3020 may control the signal flow between each block to perform the operation according to the flowcharts described above.

For example, the controller 3020 may transmit the LCH and the profile mapping information to the terminal, and may transmit the UL grant.

Accordingly, the controller 3020 can receive data determined based on the profile information included in the UL grant from the terminal.

Alternatively, the control unit 3020 may transmit information on the parameter set to the terminal, and may receive the selected data based on the information on the parameter set and the profile information included in the UL grant.

In addition, the controller 3020 can transmit the profile information to the terminal using various methods described above.

The storage unit 3030 may store at least one of information transmitted / received through the transmission / reception unit 3010 and information generated through the control unit 3020.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. Accordingly, the scope of the present invention should be construed as being included in the scope of the present invention, all changes or modifications derived from the technical idea of the present invention.

Claims (16)

A method of a terminal in a wireless communication system,
Receiving mapping information between a logical channel and profile information of an uplink grant from a base station;
Receiving an uplink grant from the base station;
And transmitting data to the base station based on the received uplink grant profile information and the mapping information.
The method according to claim 1,
Wherein the step of transmitting the data comprises:
And transmits data for a logical channel corresponding to profile information of the received uplink grant.
The method according to claim 1,
Wherein when the profile information of the received uplink grant includes profile identifier information, the mapping information includes a mapping relationship between the profile identifier information and the logical channel,
Wherein the step of transmitting the data comprises:
And transmits data for a logical channel corresponding to the profile identifier information of the received uplink grant.
The method according to claim 1,
Wherein the step of receiving the uplink grant comprises:
The UE determines the profile information using at least one of the bandwidth information, the frequency information, the time information, the period information, the format information of the UL grant, and the information included in the UL grant received from the UL grant &Lt; / RTI &gt;
A method of a base station in a wireless communication system,
Transmitting mapping information between a logical channel and profile information of an uplink grant to a terminal;
Transmitting an uplink grant to the terminal;
And receiving the selected data based on the uplink grant profile information and the mapping information.
6. The method of claim 5,
Wherein the receiving the data comprises:
And receiving data on a logical channel of the terminal corresponding to profile information of the uplink grant.
6. The method of claim 5,
Wherein the mapping information includes a mapping relationship between the profile identifier information and the logical channel when the profile identifier information is included in the profile information of the received uplink grant,
Wherein the receiving the data comprises:
And receiving data on a logical channel of the terminal corresponding to profile ID information of the received uplink grant.
6. The method of claim 5,
Wherein the profile information comprises:
The uplink grant is confirmed using at least one of bandwidth information, frequency information, time information, period information, format information of the uplink grant, and information included in the uplink grant. How to.
A terminal in a wireless communication system,
A transmitting and receiving unit for transmitting and receiving signals; And
Receiving mapping information between a logical channel and profile information of an uplink grant from a base station, receiving an uplink grant from the base station, and transmitting data to the base station based on profile information of the received uplink grant and the mapping information And a control unit for transmitting the control signal to the terminal.
10. The method of claim 9,
Wherein,
And transmits data for a logical channel corresponding to the profile information of the received uplink grant.
10. The method of claim 9,
Wherein when the profile information of the received uplink grant includes profile identifier information, the mapping information includes a mapping relationship between the profile identifier information and the logical channel,
Wherein,
And transmits data for a logical channel corresponding to the profile identifier information of the received uplink grant.
10. The method of claim 9,
Wherein,
The UE determines the profile information using at least one of the bandwidth information, the frequency information, the time information, the period information, the format information of the UL grant, and the information included in the UL grant received from the UL grant To the terminal.
A base station in a wireless communication system,
A transmitting and receiving unit for transmitting and receiving signals; And
A control unit for transmitting mapping information between a logical channel and profile information of an uplink grant to a terminal, transmitting an uplink grant to the terminal, and receiving selected data based on profile information of the uplink grant and the mapping information The base station comprising:
14. The method of claim 13,
Wherein,
And receives data on a logical channel of the terminal corresponding to the profile information of the uplink grant.
14. The method of claim 13,
Wherein the mapping information includes a mapping relationship between the profile identifier information and the logical channel when the profile identifier information is included in the profile information of the received uplink grant,
Wherein,
And receives data on a logical channel of the terminal corresponding to the profile identifier information of the received uplink grant.
14. The method of claim 13,
Wherein the profile information comprises:
The uplink grant is confirmed using at least one of bandwidth information, frequency information, time information, period information, format information of the uplink grant, and information included in the uplink grant. .

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