KR102348188B1 - Scheduling device - Google Patents

Abstract

The present invention proposes a scheduling device and an operating method of the scheduling device that can realize a scheduling technique that quickly reflects an actual radio environment when transmitting downlink data of a UE in an EN-DC split bearer environment.

Description

Scheduling device {SCHEDULING DEVICE}

The present invention relates to an EN-DC (E-UTRA NR Dual Connectivity) environment in which E-UTRA technology and NR technology are interlocked, and more particularly, the merge transmission of DL data of the UE in the EN-DC Split Bearer environment. It relates to technology to increase performance (efficiency).

Currently, it is difficult to commercialize the service only with the NR (New Radio, 5G) standard, and considering the excessive initial NR investment cost and the inability to provide NR independent commercial service, many operators are using the existing commercialized E-UTRA (LTE) technology and NR (5G) technology. ) uses or is expected to use the EN-DC (E-UTRA NR Dual Connectivity) method that links the technology.

As shown in FIG. 1, the EN-DC architecture is a method of interworking an existing EPC (MME/S-GW) and an E-UTRA base station (hereinafter, eNB)/NR base station (hereinafter, gNB), and signaling The control plane is interlocked around the eNB, and the user plane for data transmission is a method in which both the eNB/gNB are interlocked.

In terms of the user plane, the data session of the terminal has three types of bearers: MCG Bearer, SCG Bearer, and Split Bearer.

MCG Bearer is configured in E-UTRA PDCP (Packet Data Convergence Protocol) or NR PDCP, and SCG and Split Bearer are configured in NR PDCP.

Accordingly, when the UE uses a Split Bearer based on interworking between eNB/gNB, the downlink data received from the EPC (MME/S-GW) is separated from the NR PDCP of the gNB and then the E-UTRA RLC of the eNB and It may be transmitted to the gNB's NR RLC and received by the UE from each eNB/gNB through a lower layer within the eNB/gNB. And, in the NR PDCP of the UE, the sequence number of downlink data transmitted from each E-UTRA RLC and NR RLC is ordered and restored, so that it can be transmitted and used to a higher layer.

As such, in the DC (Dual Connectivity) technology, as data is merged in the PDCP layer, even timing issues or other packets can be merged and transmitted. Merge transmission, which is distributed transmission, is possible.

On the other hand, according to the EN-DC technology, however, since data transmitted in one direction is transmitted late by interworking/merging eNB and gNB of different communication methods, the entire transmission There are downsides to slowing things down.

In order to compensate for these shortcomings, it is a method that continuously informs the NR PDCP of the resource size (buffer size) of both LTE/5G, and provides the NR PDCP with information that allows it to know how much data to transmit over which communication network. The DL DATA DELIVERY STATUS (DDDS) function is being used.

However, since the DDDS function only informs the resource size of the communication network, that is, the buffer size of the eNB/gNB and related information, in the current EN-DC technology, only data can be merged and transmitted depending on the DDDS function of the eNB/gNB, and the wireless environment is improved. Since it cannot be reflected, in an actual environment, it is difficult to reflect a problem in which the performance (efficiency) of merged transmission is deteriorated due to wireless environmental factors.

Accordingly, the present invention intends to propose a new scheduling technique for improving the performance (efficiency) of merge transmission by reflecting the radio environment when transmitting DL data of the UE in the EN-DC Split Bearer environment.

The present invention was created in consideration of the above circumstances, and the object of the present invention is to increase the performance (efficiency) of merge transmission by reflecting the wireless environment when transmitting DL data of the UE in the EN-DC Split Bearer environment. It is to realize a new scheduling technique for

A scheduling apparatus according to a first aspect of the present invention for achieving the above object includes: an information check unit for checking radio environment information of each base station for a data session of a terminal established using two or more different base stations; and when data is transmitted to the terminal through the data session, a transmission ratio of each transmission path is determined between the terminal and the two or more base stations based on the size of the data and radio environment information of each base station, so that the data is and a scheduling unit that enables transmission through the two or more base stations according to a transmission rate of each transmission path.

Specifically, the information confirmation unit includes at least one of a radio resource usage rate of the base station, a hand-off or a cell change, and a radio connection failure between base stations of different communication methods. The radio environment information can be checked by using a specific message defined for transmitting the radio environment information.

Specifically, the scheduling unit may differently utilize the radio environment information of each base station according to whether the size of the data satisfies a condition smaller than the buffer size of the first base station among the two or more base stations, and send the data to the first base station. It is possible to determine a transmission rate of each transmission path for transmitting the entire data or a transmission rate for each transmission path through which the data is distributed and transmitted to the two or more base stations.

Specifically, the scheduling unit may recognize the buffer size of each base station from a DL Data Delivery Status (DDDS) function.

Specifically, when the condition is satisfied, the scheduling unit checks whether or not at least one of a handoff of the terminal, a cell change, and a radio connection failure occurs from the radio environment information of the first base station, and the occurrence of the specific situation When this is confirmed, a transmission rate of each transmission path for distributing the data to the two or more base stations is determined, and when the occurrence of the specific situation is not confirmed, the transmission rate of each transmission path for transmitting the entire data to the first base station. The transmission rate can be determined.

Specifically, when the condition is not satisfied, the scheduling unit checks whether at least one specific situation of handoff, cell change, and radio access failure of the terminal occurs from radio environment information of a second base station among the two or more base stations, and When the occurrence of a specific situation is confirmed, a transmission ratio of each transmission path for transmitting the entire data to the first base station is determined, and when the occurrence of the specific situation is not confirmed, the data is distributed and transmitted to the two or more base stations It is possible to determine the transmission rate of the transmission path.

Specifically, the scheduling unit may determine based on the buffer size of each of the two or more base stations when determining the transmission ratio of each transmission path for distributing the data to the two or more base stations.

Specifically, the scheduling unit, when checking the rate drop of the second base station while the data is being transmitted according to the transmission ratio of each transmission path determined to be distributed to the two or more base stations, is confirmed from the radio environment information of each base station Using the radio resource usage rate and the packet loss rate of each base station, the predetermined transmission rate of each transmission path can be adjusted.

Specifically, the scheduling unit determines the radio channel performance of each base station using the radio resource usage rate confirmed from the radio environment information of each base station and the packet loss rate of each base station, and determines the radio channel performance of each base station and Based on the transmission rate of each base station, a transmission rate of each transmission path for distributing the data to the two or more base stations is calculated, and the predetermined transmission rate of each transmission path and transmission of each calculated transmission path are calculated. By using the ratio, the transmission ratio of each transmission path can be adjusted.

Specifically, the two or more base stations may have the same Packet Data Convergence Protocol (PDCP) layer, and a Radio Link Control (RLC) layer and lower layers of the RLC layer may be different from each other.

In order to achieve the above object, the method of operating a scheduling apparatus according to a second aspect of the present invention includes an information checking step of checking radio environment information of each base station for a data session of a terminal established using two or more different base stations. ; and when data is transmitted to the terminal through the data session, a transmission ratio of each transmission path is determined between the terminal and the two or more base stations based on the size of the data and radio environment information of each base station, so that the data is and a scheduling step of enabling transmission through the two or more base stations according to the transmission ratio of each transmission path.

Specifically, the information checking step includes at least one of a radio resource usage rate of the base station, a hand-off or a cell change, and a radio connection failure between base stations of different communication methods. The radio environment information can be checked by using a specific message defined for transmitting the radio environment information.

Specifically, in the scheduling step, the radio environment information of each base station is used differently depending on whether the size of the data satisfies a condition smaller than the buffer size of the first base station among the two or more base stations, It is possible to determine a transmission rate of each transmission path for transmitting the entire data or a transmission rate for each transmission path through which the data is distributed and transmitted to the two or more base stations.

Specifically, in the scheduling step, when the condition is satisfied, from the radio environment information of the first base station, it is confirmed whether at least one of a handoff of the terminal, a cell change, and a radio connection failure occurs, and When the occurrence is confirmed, a transmission rate of each transmission path for distributing the data to the two or more base stations is determined, and when the occurrence of the specific situation is not confirmed, each transmission path for transmitting the entire data to the first base station can determine the transmission rate of

Specifically, in the scheduling step, when the condition is not satisfied, it is confirmed whether at least one specific situation of handoff, cell change, and radio connection failure of the terminal occurs from radio environment information of a second base station among the two or more base stations, When the occurrence of the specific situation is confirmed, a transmission rate of each transmission path for transmitting the entire data to the first base station is determined, and when the occurrence of the specific situation is not confirmed, the data is distributed and transmitted to the two or more base stations The transmission rate of each transmission path can be determined.

Specifically, the scheduling unit may determine based on the buffer size of each of the two or more base stations when determining the transmission ratio of each transmission path for distributing the data to the two or more base stations.

Specifically, in the scheduling step, when checking the rate drop of the second base station while the data is being transmitted according to the transmission ratio of each transmission path determined to be distributed to the two or more base stations, check from the radio environment information of each base station The predetermined transmission rate of each transmission path can be adjusted using the radio resource usage rate and the packet loss rate of each base station.

Accordingly, the scheduling apparatus and the method of operating the scheduling apparatus of the present invention can realize a scheduling technique reflecting the wireless environment when transmitting downlink data of a terminal in an EN-DC split bearer environment.

For this reason, according to the present invention, an effect of improving the performance (efficiency) of merge transmission is derived through scheduling that quickly reflects the actual wireless environment such as RF quality degradation in the EN-DC split bearer environment.

1 is an exemplary diagram showing an EN-DC (E-UTRA NR Dual Connectivity) environment to which the present invention is applied.
2 is an exemplary diagram illustrating a base station and a terminal from a layer perspective in an EN-DC split bearer environment to which the present invention is applied.
3 is an exemplary diagram showing the configuration of a scheduling apparatus according to an embodiment of the present invention.
4 is a flowchart illustrating a method of operating a scheduling apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

The present invention relates to an EN-DC (E-UTRA NR Dual Connectivity) environment in which E-UTRA technology and NR technology are interlocked.

As shown in FIG. 1, the EN-DC architecture is a method of interworking an existing EPC (MME/S-GW) and an E-UTRA base station (hereinafter, eNB)/NR base station (hereinafter, gNB), and signaling The control plane is interlocked around the eNB, and the user plane for data transmission is a method in which both the eNB/gNB are interlocked.

In particular, the present invention relates to a split bearer among data session types used in an EN-DC environment.

Hereinafter, for convenience of explanation, as shown in FIG. 1 , assuming an EN-DC Split Bearer environment in which the UE 30 uses a Split Bearer based on interworking between the eNB 20 / gNB 10 , Let me explain.

And, downlink data transmission in the aforementioned EN-DC Split Bearer environment will be described with reference to FIG. 2 .

First, downlink data received from the EPC (MME/S-GW) is separated from the PDCP (hereinafter, NR PDCP) of the gNB 10 and then the E-UTRA RLC of the eNB 20 and the NR of the gNB 10 It may be transmitted by RLC and received by the UE 30 from each eNB 20 / gNB 10 through a lower layer within the eNB 20 / gNB 10 .

Accordingly, in the NR PDCP of the terminal 30, the sequence number of the downlink data received from the eNB 20 / gNB 10 and transmitted from each E-UTRA RLC and NR RLC is ordered and restored, and delivered and used to a higher layer. make it possible

As such, in the DC (Dual Connectivity) technology, as data is merged in the PDCP layer, even timing issues or other packets can be merged and transmitted. Merge transmission, which is distributed transmission, is possible.

On the other hand, according to the EN-DC technology, however, since data transmitted in one direction is transmitted late by interworking/merging eNB and gNB of different communication methods, the entire transmission There are downsides to slowing things down.

Specifically, the terminal 30 checks the sequence number of downlink data received through each transmission path #2, #1 of the eNB 20 / gNB 10 and transmitted from each E-UTRA RLC and NR RLC. Since the corresponding data is delivered and restored to the upper layer in order, the data packets (PDCP PDUs) in the order must arrive through each transmission path #2, #1 of the eNB(20)/gNB(10) for high-speed data. transmission is possible.

But, for example, when the transmission speed of 5G is fast and the transmission speed of LTE is slow, if data is distributed and transmitted to LTE/5G, that is, eNB(20)/gNB(10) at the same rate, LTE, that is, eNB(20) Since the data (packet) through the transmission path #2 arrives at the terminal 30 late, the terminal 30 waits until the data (packet) transmitted through LTE arrives, and the overall transmission speed of the merged transmission is further increased. becomes slow

In order to compensate for these shortcomings, it is a method that continuously informs the NR PDCP of the resource size (buffer size) of both LTE/5G, and provides the NR PDCP with information that allows it to know how much data to transmit over which communication network. The DL DATA DELIVERY STATUS (DDDS) function is being used.

However, since the DDDS function only informs the resource size of the communication network, that is, the buffer size of the eNB 20 / gNB 10 and related information, in the current EN-DC technology, the DDDS function of the eNB 20 / gNB 10 is applied. Because data can be merged and transmitted depending on it and cannot reflect the wireless environment, it is difficult to reflect the problem of deterioration in performance (efficiency) of merged transmission due to wireless environmental factors in an actual environment.

Accordingly, the present invention intends to propose a new scheduling technique for improving the performance (efficiency) of merge transmission by reflecting the radio environment when transmitting DL data of the UE in the EN-DC Split Bearer environment.

Hereinafter, a configuration of a scheduling apparatus according to an embodiment of the present invention will be described with reference to FIG. 3 .

As shown in FIG. 3 , the scheduling apparatus 100 according to an embodiment of the present invention may include an information confirmation unit 110 and a scheduling unit 120 .

Furthermore, the scheduling apparatus 100 according to an embodiment of the present invention includes, in addition to the above-described configuration, a communication unit ( 130) may further include a configuration.

Here, the communication unit 130 includes, but is not limited to, for example, an antenna system, an RF transceiver, one or more amplifiers, a tuner, one or more oscillators, a digital signal processor, a codec (CODEC) chipset, and a memory, etc. All known circuits to be performed may be included.

All or at least a part of the configuration of the scheduling apparatus 100 may be implemented in the form of a hardware module or a software module, or may be implemented in a form in which a hardware module and a software module are combined.

Here, the software module may be understood as, for example, an instruction executed by a processor that controls operations in the scheduling device 100 , and this command may have a form mounted in a memory in the scheduling device 100 . .

As a result, the scheduling apparatus 100 according to an embodiment of the present invention, through the above-described configuration, a new scheduling scheme proposed in the present invention, that is, a scheduling scheme reflecting a radio environment when transmitting DL data in an EN-DC split bearer environment. In the following, each configuration in the scheduling device 100 for realizing this will be described in more detail.

Prior to the description, the scheduling device 100 of the present invention may be a device separate from the base station (eNB, gNB), and the base station ( It may be the same device as the eNB or gNB).

Hereinafter, for convenience of description, according to the current EN-DC Split Bearer technology standard, the scheduling device 100 of the present invention will be described with reference to an embodiment implemented to be the same as or included in the NR base station, that is, 5G gNB.

The information check unit 110 is responsible for checking radio environment information of each base station with respect to a data session of a terminal established using two or more different base stations.

Here, two or more different base stations have the same PDCP layer, and the RLC (Radio Link Control) layer and the lower layers of the RLC layer mean different base stations, and may be two base stations or three or more base stations.

As a specific example, two or more different base stations may mean a base station (hereinafter, eNB) based on E-UTRA technology and a base station based on New Radio (5G) technology (hereinafter, gNB) in an EN-DC environment. have.

That is, the information check unit 110 may check the radio environment information of each eNB and gNB with respect to a data session of the terminal established using the eNB and the gNB, that is, the split bearer.

Hereinafter, for convenience of description, as shown in FIGS. 1 and 2 , it is assumed that the UE 30 uses an EN-DC Split Bearer environment based on interworking between the eNB 20 / gNB 10 and uses a split bearer environment. would.

In this case, the information check unit 110 checks the radio environment information of each eNB 20 and gNB 10 with respect to the data session of the terminal 30 , that is, the split bearer.

At this time, the information check unit 110, between the base stations of different communication methods, the radio resource usage rate of the base station, handoff (Hand-off) or cell change (Cell change), at least one of the radio connection failure (RF Failure) The above-mentioned radio environment information can be checked by using a specific message defined for transmitting the included radio environment information.

Since the scheduling device 100 of the present invention is implemented to be the same as or included in the gNB 10 , the information check unit 110 includes radio environment information of the gNB 10 in which the scheduling device 100 is implemented, for example, the gNB 10 . ) of radio resource usage rate (PRB usage rate), hand-off or cell change, radio access failure (RF Failure), load status, etc. )can confirm.

On the other hand, the information confirmation unit 110 interlocks (EN-DC) with the gNB 10 and provides the above-mentioned radio environment information for the eNB 20 of another communication method involved in the split bearer setting of the terminal 30 . have to acquire

Meanwhile, in the current standard, an X2 interface for information transfer between base stations is defined, and recently, a message (E-UTRA-NR) capable of transferring information related to radio environments under various conditions between base stations of different communication methods through the X2 interface. Cell Resource Coordination Request/Response) has been newly defined.

Accordingly, the information confirmation unit 110, the E-UTRA-NR Cell Resource Coordination Request/ By utilizing the Response message, radio environment information of the eNB 20, for example, the radio resource usage rate (PRB usage rate) of the eNB 20, hand-off or cell change, radio connection failure (RF) Failure), load status, etc. wireless environment-related information (wireless environment information) can be acquired and checked.

Here, the time at which the information check unit 110 checks the radio environment information of each eNB 20 and gNB 10 may be a periodic time according to a preset period, or may be a preset event occurrence time, In addition to this, the timing may be set according to various methods/standards.

When transmitting data to the terminal 30 through a data session, that is, split bearer, the scheduling unit 120 transmits the data size of the transmission target and radio environment information of each base station, i.e., radio environment information of the eNB 20 / gNB 10 . Based on the determination of the transmission ratio of each transmission path between the terminal 30 and the eNB 20 / gNB 10, the eNB (20) / gNB (10) It is responsible for the function that allows it to be transmitted through

That is, the scheduling unit 120, when data transmission through the split bearer based on interworking between the eNB 20 / gNB 10, information related to the radio environment of various conditions of the eNB 20 / gNB 10 ( Radio environment information) is a method of determining the transmission ratio of each transmission path between the terminal 30 and the eNB 20/gNB 10 based on the radio environment information, and scheduling is performed reflecting the radio environment.

Hereinafter, a scheduling scheme reflecting the wireless environment proposed by the present invention will be described in detail.

The scheduling unit 120 differently utilizes radio environment information of each base station according to whether the data size of the transmission target satisfies a condition smaller than the buffer size of the first base station among the above-described two or more base stations, and transmits data to the first base station. It is possible to determine the transmission rate of each transmission path for transmitting the whole, or the transmission rate for each transmission path through which data is distributed and transmitted to two or more base stations.

Here, in an embodiment in which two or more base stations are the eNB 20 / gNB 10 , the first base station means the gNB 10 in which the scheduling apparatus 100 is implemented, and the second base station to be described later is the gNB 10 . It may mean the eNB 20 of a communication method (LTE) different from .

That is, the scheduling unit 120 determines whether the data size to be transmitted is smaller than the buffer size of the gNB 10 among the eNBs 20/gNB 10 according to whether or not each eNB 20/gNB 10 is satisfied. ), a transmission ratio of each transmission path that transmits the entire data to the gNB 10, or a transmission rate of each transmission path that enables distributed transmission of data to the eNB 20/gNB 10 by using the radio environment information of ). can be decided

In this case, in the case of the present invention, the scheduling unit 120 may recognize the buffer size of each base station, that is, the buffer size of the eNB 20 / gNB 10 from the DL Data Delivery Status (DDDS) function.

As described above, in the current EN-DC technology, the resource size (RCL Buffer size) of both LTE/5G is continuously notified to NR PDCP to determine how much data should be transmitted to which communication network in NR PDCP. The DDDS function, which can be used to determine the transmission rate, is used.

Accordingly, since the scheduling unit 120 in the scheduling apparatuses 100 and 10 of the present invention may be the same as or interlocked with the NR PDCP in the gNB 10, the scheduling unit 120 performs the above DDDS function in the eNB 20/ The resource size of the gNB 10 , that is, the buffer size may be recognized.

Accordingly, the scheduling unit 120 determines the transmission rate of each transmission path by using the radio environment information of the first base station, that is, the gNB 10 when the condition that the data size of the transmission target is smaller than the buffer size of the gNB 10 is satisfied. When the above condition is not satisfied, the transmission rate of each transmission path may be determined by using the radio environment information of the second base station, that is, the eNB 20 .

More specifically, when the condition that the data size of the transmission target is smaller than the buffer size of the gNB 10 is satisfied, the scheduling unit 120 performs the handoff of the terminal 30 from the radio environment information of the gNB 10, the cell It is possible to check whether at least one specific situation of change and wireless connection failure occurs.

That is, when the condition that the data size of the transmission target is smaller than the buffer size of the gNB 10 is satisfied, the scheduling unit 120 gives priority to the 5G (gNB 10) alone transmission for the data of the current transmission target, but the gNB ( It is to check whether a specific situation that affects the 5G radio (RF) quality deterioration of the terminal 30 occurs by using the radio environment information of 10).

Accordingly, the scheduling unit 120, when the occurrence of the above-described specific situation, that is, a specific situation affecting the 5G radio (RF) quality deterioration is confirmed, the data to be transmitted this time is distributed to the eNB 20 / gNB 10 . It is possible to determine the transmission rate of each transmission path that allows the transmission path to be transmitted, and when the occurrence of the above-described specific situation is not confirmed, the transmission rate of each transmission path that allows the entire data to be transmitted this time to be transmitted to the gNB 10 may be determined.

That is, the scheduling unit 120, at the time of data transmission through the split bearer based on interworking between the eNB 20 / gNB 10, the above-described specific situation, that is, the specific situation affecting the 5G radio (RF) quality degradation. If the occurrence is not confirmed as a result of checking whether or not the occurrence has occurred, the transmission ratio of each transmission path that allows the entire data to be transmitted this time to be transmitted to the gNB 10, as in the previous case where the 5G (gNB 10) single transmission was given priority. A transmission ratio (Path #2:#1 = 0:100) that transmits 100% to #1 may be determined.

On the other hand, the scheduling unit 120, at the time of data transmission through the split bearer based on interworking between the eNB 20 / gNB 10, the above-described specific situation, that is, a specific situation affecting the 5G radio (RF) quality degradation. If the occurrence is confirmed as a result of checking whether or not the occurrence has occurred, it is possible to determine the transmission ratio of each transmission path, such as Path #2:#1 = N:M, that allows the data to be transmitted this time to be distributed to the eNB (20)/gNB (10). have.

At this time, the scheduling unit 120 determines a transmission ratio (eg, Path #2:#1 = N:M) of each transmission path for distributed transmission (merged transmission) of data to the eNB 20 / gNB 10 . In this case, the buffer size of each eNB 20 / gNB 10 , that is, a method of determining based on the resource size (RLC buffer size) recognized through the DDDS function may be followed.

As such, in the scheduling method of the present invention, when the data size of the transmission target is smaller than the buffer size of the gNB 10 is satisfied, the 5G radio (RF) quality of the terminal 30 is utilized by using the radio environment information of the gNB 10 . By checking/determining in real time whether a specific situation that affects deterioration occurs, the transmission ratio (Path #2: #1 = 0:100), and if there is a specific situation, the transmission of each transmission path so that data is distributed (merged transmission) to the eNB 20 / gNB 10 by reflecting the 5G radio (RF) quality deterioration situation The ratio (Path #2:#1 = N:M) can be determined.

On the other hand, when the condition that the data size of the transmission target is smaller than the buffer size of the gNB 10 is dissatisfied, the scheduling unit 120 performs handoff, cell change, and radio access of the terminal 30 from the radio environment information of the eNB 20 . It is possible to check whether at least one specific situation has occurred among failures.

That is, the scheduling unit 120 merges LTE/5G (eNB (20)/gNB (10)) with respect to the data of the current transmission target when the condition that the data size of the transmission target is smaller than the buffer size of the gNB 10 is dissatisfied. The transmission is prioritized, but by utilizing the radio environment information of the gNB 10 , it is checked whether a specific situation that affects the deterioration of the LTE radio (RF) quality of the terminal 30 occurs.

Accordingly, when the occurrence of the above-described specific situation, that is, a specific situation affecting the LTE radio (RF) quality degradation is confirmed, the scheduling unit 120 transmits the entire data to be transmitted to the gNB 10 this time through each transmission path. can determine the transmission rate of , and when the occurrence of the above-described specific situation is not confirmed, the transmission rate of each transmission path for distributing the data to be transmitted this time to the eNB 20 / gNB 10 can be determined.

That is, the scheduling unit 120 is, at the time of data transmission through the split bearer based on interworking between the eNB 20 / gNB 10, the above-described specific situation, that is, the specific situation affecting the LTE radio (RF) quality degradation. If the occurrence is not confirmed as a result of checking whether or not the occurrence has occurred, the data to be transmitted this time is distributed to the eNB (20) / gNB (10), as previously in LTE/5G (eNB (20) / gNB (10)) merged transmission was prioritized. A transmission ratio of each transmission path to be transmitted, for example, Path #2:#1 = N:M may be determined.

On the other hand, the scheduling unit 120, at the time of data transmission through the split bearer based on interworking between the eNB 20 / gNB 10, the above-described specific situation, that is, the specific situation affecting the LTE radio (RF) quality degradation. If the occurrence is confirmed as a result of checking the occurrence, the transmission ratio of each transmission path that transmits the entire data of the current transmission target to the gNB 10, that is, the transmission ratio of 100% to Path #1 (Path #2:#1 = 0:100) can be determined.

At this time, the scheduling unit 120 determines a transmission ratio (eg, Path #2:#1 = N:M) of each transmission path for distributed transmission (merged transmission) of data to the eNB 20 / gNB 10 . In this case, the buffer size of each eNB 20 / gNB 10 , that is, a method of determining based on the resource size (RLC buffer size) recognized through the DDDS function may be followed.

As such, in the scheduling technique of the present invention, when the condition that the data size of the transmission target is smaller than the buffer size of the gNB 10 is dissatisfied, the LTE radio (RF) quality of the terminal 30 is utilized by using the radio environment information of the eNB 20 . By checking/determining in real time whether a specific situation affecting deterioration occurs, if there is no specific situation, the transmission ratio of each transmission path (Path #2) so that data is distributed (merged transmission) to the eNB(20)/gNB(10) :#1 = N:M), and if there is a specific situation, the transmission of each transmission path so that the entire data (100%) is transmitted exclusively to 5G (gNB(10)) reflecting the LTE radio (RF) quality deterioration situation You can determine the ratio (Path #2:#1 = 0:100).

Furthermore, the scheduling unit 120 is configured to transmit data according to a transmission ratio (eg, Path #2:#1 = N:M) of each transmission path determined to be distributedly transmitted to the eNB 20 / gNB 10 . During (hereinafter, LTE/5G merged transmission), when the speed degradation of the eNB 20 is confirmed, the radio resource usage rate confirmed from the radio environment information of each eNB 20 / gNB 10 and each eNB 20 / gNB ( 10), the transmission ratio of each transmission path (eg, Path #2:#1 = N:M) can be adjusted using the packet loss rate.

That is, the scheduling unit 120 performs the transmission Path #2 of the eNB 20 while data is merged LTE/5G transmission according to the transmission ratio of each transmission path (eg, Path #2:#1 = N:M). Whether or not the speed of the eNB 20 is lowered can be checked based on factors that can estimate the transmission speed, such as the number of times of data (packet) retransmission through , or a reception response time.

Accordingly, the scheduling unit 120, when the speed degradation of the eNB 20 is confirmed while data is transmitted LTE/5G merged transmission according to the transmission ratio of each transmission path (eg, Path #2:#1 = N:M) , using the radio resource usage rate (PRB usage rate) confirmed from the radio environment information of each eNB (20) / gNB (10) and the packet loss rate (Packet loss rate) of each eNB (20) / gNB (10), The transmission ratio (eg, Path #2:#1 = N:M) of each transmission path may be adjusted (eg, Path #2:#1 = N':M').

Specifically, the scheduling unit 120, the radio resource usage rate (PRB usage rate) confirmed from the radio environment information of each eNB (20) / gNB (10) and each eNB (20) / gNB (10) packet The radio channel performance of each eNB 20 / gNB 10 may be determined using a packet loss rate.

For example, the scheduling unit 120 may determine the radio channel performance of the gNB 10 , that is, the 5G radio (RF) quality of the terminal 30 according to Equation 1 below, and the radio channel of the eNB 20 . The performance, that is, the LTE radio (RF) quality of the terminal 30 may be determined according to Equation 2 below.

And, the scheduling unit 120, the radio channel performance of each eNB (20) / gNB (10) determined above, that is, LTE RF quality / 5G RF quality, and the transmission rate (bit rate) of each eNB (20) / gNB (10) ), it is possible to calculate a transmission ratio of each transmission path that allows data to be distributed and transmitted to the eNB 20 / gNB 10 .

For example, the scheduling unit 120 may calculate a transmission ratio of each transmission path according to Equation 3 below.

Accordingly, the scheduling unit 120 determines the transmission ratio of each transmission path, e.g., Path #2:#1 = N:M, and each transmission path calculated based on LTE RF quality/5G RF quality and transmission rate. Using the transmission ratio, the transmission ratio Path #2:#1 = N:M of each transmission path can be adjusted to Path #2:#1 = N':M'.

As such, in the scheduling method of the present invention, when the condition that the data size of the transmission target is smaller than the buffer size of the gNB 10 is not satisfied, the transmission ratio of each transmission path so that distributed transmission (merged transmission) to the eNB 20 / gNB 10 When (Path #2:#1 = N:M) is determined and a decrease in the speed of the eNB 20 is confirmed while data is transmitted LTE/5G merged, the actual radio environment (LTE RF quality/5G RF quality and transmission speed) ), calculates the transmission ratio of each transmission path and reflects it in the transmission ratio of the existing transmission path (eg, Path #2:#1 = N:M) that has been determined/used (eg, summation, average, statistics, etc.) Accordingly, the transmission ratio of the existing transmission path, for example, Path #2:#1 = N:M) can be adjusted to Path #2:#1 = N':M'.

As such, in the scheduling technique of the present invention, the change in the wireless environment (LTE RF quality/5G RF quality and transmission speed) temporarily deteriorates and can be improved again, so the actual wireless environment (LTE RF quality/5G RF quality and transmission speed) is Instead of using/applying the calculated transmission ratio of each transmission path to data transmission as it is, it can be reflected in the transmission ratio of the existing transmission path that has been determined/used to adjust the transmission ratio of the existing transmission path step by step according to the wireless environment. Therefore, even when the wireless environment temporarily deteriorates and improves, it is possible to prevent in advance the situation in which the transmission rate of the transmission path needs to be drastically changed, and it can lead to the advantage of flexibly operating merged transmission.

As described above, according to the scheduling device according to the embodiment of the present invention, when the downlink data transmission of the terminal in the EN-DC split bearer environment, by realizing a scheduling technique that quickly reflects the actual radio environment such as RF quality degradation, LTE It derives the effect of significantly increasing the performance (efficiency) of /5G merged transmission.

For this reason, according to the present invention, the overall resource efficiency is increased by increasing the performance (efficiency) of LTE/5G merged transmission in the 5G Non-Standalone (NSA) structure to provide higher-speed data transmission and low-delay service to customers. OPEX savings can also be expected, such as adding equipment.

Hereinafter, a method of operating a scheduling apparatus according to an embodiment of the present invention will be described with reference to FIG. 4 .

Hereinafter, for convenience of description, the scheduling apparatus 100 of the present invention will be described with reference to an embodiment in which the scheduling apparatus 100 is the same as or included in the NR base station, that is, 5G gNB.

According to this embodiment, in the method of operating a scheduling apparatus according to the present invention, the scheduling apparatuses 100 and 10, the data session of the terminal 30 based on interworking between the eNB 20 / gNB 10, that is, Split You can participate in the bearer setting (S10).

On the other hand, in the method of operating the scheduling apparatus according to the present invention, the scheduling apparatuses 100 and 10, with respect to the data session of the terminal 30 based on interworking between the eNB 20 / gNB 10, that is, the Split Bearer, Through the DDDS function, it is possible to recognize the resource size (RCL buffer size) of both LTE/5G, that is, the RCL buffer size of the eNB (20)/gNB (10) (S20).

If, in the method of operating the scheduling apparatus according to the present invention, the scheduling apparatuses 100 and 10 relate to the data session of the terminal 30 based on interworking between the eNB 20 / gNB 10, that is, the split bearer, If the information based on the DDDS function is not received (S20 No), the transmission ratio of each transmission path that allows the entire data to be transmitted to the gNB 10, that is, the transmission ratio of 100% to Path #1 (Path #2) :#1 = 0:100) to determine 5G (gNB(10)) only transmission (S25)

In the method of operating the scheduling device according to the present invention, the scheduling devices 100 and 10, upon receiving such DDDS function-based information (resource size of both LTE/5G) (S20 Yes), a specific message (eg, E-UTRA) - It is possible to check the radio environment information of each eNB 20 and gNB 10 that can be acquired/recognized by using NR Cell Resource Coordination Request/Response (S30).

Accordingly, in the method of operating a scheduling apparatus according to the present invention, the scheduling apparatuses 100 and 10, when transmitting data through a split bearer based on interworking between the eNB 20/gNB 10, It may be checked whether the data size satisfies a condition smaller than the buffer size of the gNB 10 ( S40 ).

And, in the method of operating a scheduling apparatus according to the present invention, the scheduling apparatuses 100 and 10 perform radio environments of each eNB 20/gNB 10 according to whether the above conditions are satisfied (S40 Yes or No). By using the information differently, it is possible to determine the transmission ratio of each transmission path for transmitting the entire data to the gNB 10 or the transmission rate for each transmission path for distributed transmission of data to the eNB 20 / gNB 10 . .

More specifically, in the method of operating a scheduling device according to the present invention, the scheduling devices 100 and 10, when a condition that the data size of the transmission target is smaller than the buffer size of the gNB 10 is satisfied (S40 Yes), the gNB ( From the radio environment information of 10), it can be confirmed whether at least one specific situation of handoff, cell change, and radio access failure of the terminal 30 occurs.

That is, the scheduling devices 100 and 10, when the condition that the data size of the transmission target is smaller than the buffer size of the gNB 10 is satisfied, the scheduling devices 100 and 10 give priority to the 5G (gNB 10) alone transmission of the current transmission target data, It is to check whether a specific situation that affects the 5G radio (RF) quality deterioration of the terminal 30 occurs by utilizing the radio environment information of the gNB 10 .

Accordingly, in the method of operating the scheduling device according to the present invention, the scheduling devices 100 and 10, when the occurrence of the specific situation affecting the 5G radio (RF) quality deterioration is not confirmed, the gNB 10 determines the transmission rate of each transmission path so that the entire data of the current transmission target is transmitted to the A transmission rate of each transmission path may be determined (S50).

That is, the scheduling devices 100 and 10, at the time of data transmission through the split bearer based on interworking between the eNB 20 / gNB 10, the specific situation that affects the 5G radio (RF) quality degradation described above. If the occurrence is not confirmed as a result of checking whether the situation has occurred, the transmission ratio of each transmission path that allows the entire data to be transmitted this time to be transmitted to the gNB 10, as in the previous case where 5G (gNB 10) single transmission was given priority. That is, it is possible to determine a transmission ratio (Path #2:#1 = 0:100) for transmitting 100% to Path #1 (S50 1)).

On the other hand, the scheduling devices 100 and 10, at the time of data transmission through the split bearer based on interworking between the eNB 20 / gNB 10, the specific situation that affects the 5G radio (RF) quality degradation described above. If the occurrence is confirmed as a result of checking whether the situation has occurred, the transmission ratio of each transmission path, for example, Path #2:#1 = N:M, for distributing the data to be transmitted this time to the eNB 20 / gNB 10 can be determined (S50 2)).

On the other hand, in the method of operating the scheduling device according to the present invention, the scheduling devices 100 and 10, when the data size of the transmission target is smaller than the buffer size of the gNB (10) when the condition is not satisfied (S40 No), the eNB (20) From the radio environment information, it is possible to determine whether at least one of a handoff of the terminal 30, a cell change, and a radio access failure occurs.

That is, the scheduling apparatuses 100 and 10 perform LTE/5G (eNB (20)/gNB (10) ) Prioritize merged transmission, but utilize the radio environment information of the gNB 10 to check whether a specific situation that affects the LTE radio (RF) quality deterioration of the terminal 30 occurs.

Accordingly, in the method of operating the scheduling apparatus according to the present invention, the scheduling apparatuses 100 and 10, when the occurrence of the above-described specific situation, that is, a specific situation affecting the LTE radio (RF) quality deterioration is not confirmed, the eNB 20 / It is possible to determine the transmission ratio of each transmission path so that the data of the current transmission target is transmitted to the gNB 10 in a distributed manner. It is possible to determine a transmission rate of each transmission path to be performed (S60).

That is, the scheduling devices 100 and 10, at the time of data transmission through the split bearer based on interworking between the eNB 20 / gNB 10, the specific situation described above, that is, the specific effect affecting the degradation of LTE radio (RF) quality If the occurrence is not confirmed as a result of checking whether the situation has occurred, the data to be transmitted this time to the eNB (20)/gNB (10), as before LTE/5G (eNB (20)/gNB (10)) merged transmission is prioritized It is possible to determine a transmission ratio of each transmission path, for example, Path #2:#1 = N:M (S60 1)) for distributed transmission.

On the other hand, the scheduling apparatus 100, 10, at the time of data transmission through the split bearer based on interworking between the eNB 20 / gNB 10, the specific situation that affects the LTE radio (RF) quality degradation described above. If the occurrence is confirmed as a result of checking whether the situation has occurred, the transmission ratio of each transmission path that transmits the entire data of the current transmission target to the gNB 10, that is, the transmission ratio of 100% to Path #1 (Path #2: #1 = 0:100) may be determined (S60 2)).

Furthermore, in the method of operating the scheduling apparatus according to the present invention, the scheduling apparatuses 100 and 10, the transmission ratio of each transmission path determined to be distributedly transmitted to the eNB 20 / gNB 10 (eg, Path #2: #1 = N:M) while data is being transmitted (hereinafter, LTE/5G merged transmission) When checking the speed decrease of the eNB 20, check from the radio environment information of each eNB 20 / gNB 10 The transmission ratio (eg, Path #2:#1 = N:M) of each transmission path determined in advance can be adjusted using the radio resource usage rate and the packet loss rate of each eNB (20)/gNB (10) (S60). 3)).

That is, the scheduling devices 100 and 10 perform the LTE/5G combined transmission according to the transmission ratio (eg, Path #2:#1 = N:M) of each transmission path scheduled in S60 2), while the eNB Based on factors that can estimate the transmission speed, such as the number of times of data (packet) retransmission or the reception response time through the transmission path #2 of (20), it can be checked whether the speed of the eNB 20 is lowered.

Accordingly, the scheduling apparatuses 100 and 10, according to the transmission ratio (eg, Path #2:#1 = N:M) of each transmission path scheduled by S60 2), the eNB ( 20), when the rate drop is confirmed, the radio resource usage rate (PRB usage rate) confirmed from the radio environment information of each eNB 20 / gNB 10 and the packet loss rate of each eNB 20 / gNB 10 ( Packet loss rate), it is possible to adjust the transmission ratio (eg, Path #2:#1 = N:M) of each transmission path (eg, Path #2:#1 = N':M'). There is (S60 3)).

More specifically, the scheduling apparatuses 100 and 10 include a radio resource usage rate (PRB usage rate) confirmed from radio environment information of each eNB 20 / gNB 10 and each eNB 20 / gNB 10 . It is possible to determine the radio channel performance of each eNB 20 / gNB 10 by using a packet loss rate of (see Equations 1 and 2 above).

And, the scheduling apparatus 100, 10, the radio channel performance of each eNB (20) / gNB (10) determined above, that is, LTE RF quality / 5G RF quality and the transmission rate of each eNB (20) / gNB (10) ( bit rate), it is possible to calculate a transmission rate of each transmission path for distributed transmission of data to the eNB 20 / gNB 10 (refer to Equation 3 above).

Accordingly, the scheduling apparatuses 100 and 10, each transmission calculated based on the predetermined transmission ratio of each transmission path, e.g., Path #2:#1 = N:M, and LTE RF quality/5G RF quality and transmission rate Using the transmission ratio of the Path, the transmission ratio Path #2:#1 = N:M of each transmission path can be adjusted to Path #2:#1 = N':M'.

In this case, the downlink data from the EPC (MME/S-GW) to the terminal 30 is transmitted to the gNB 10 according to the transmission rate of each transmission path determined and adjusted by the scheduling devices 100 and 10 . After separation from NR PDCP, transmission to E-UTRA RLC of eNB 20 and NR RLC of gNB 10 and each eNB 20 / gNB 10 through lower layers within eNB 20 / gNB 10 will be received by the terminal 30 from

In the above-described method of operating the scheduling apparatus according to the present invention, the scheduling apparatuses 100 and 10, as long as the data session of the terminal 30, that is, the split bearer is not released (S70 No), the above-described step S20 and thereafter can be performed repeatedly.

As described above, according to the embodiment of the present invention, according to the scheduling apparatus according to the embodiment of the present invention, when the downlink data transmission of the terminal in the EN-DC split bearer environment, the actual radio environment such as RF quality deterioration, etc. By realizing the reflected scheduling technique, the effect of remarkably increasing the performance (efficiency) of LTE/5G merged transmission is derived.

The method of operating a scheduling apparatus according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the present invention, or may be known and available to those skilled in the art of computer software. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floppy disks. - includes magneto-optical media, and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

Although the present invention has been described in detail with reference to preferred embodiments so far, the present invention is not limited to the above-described embodiments, and the technical field to which the present invention belongs without departing from the gist of the present invention as claimed in the claims below It will be said that the technical spirit of the present invention extends to a range where various modifications or modifications can be made by anyone with ordinary knowledge in the present invention.

According to the scheduling device and the method of operating the scheduling device of the present invention, when the downlink data transmission of the UE in the EN-DC split bearer environment, the scheduling technique that quickly reflects the actual wireless environment is realized, exceeding the limitations of the existing technology. Accordingly, it is an invention with industrial applicability because the possibility of marketing or business of the applied device, not just the use of the related technology, is sufficient and it can be clearly implemented in reality.

100: scheduling device
110: information confirmation unit 120: scheduling unit

Claims (9)

an information check unit for checking radio environment information of each base station for a data session of a terminal established using two or more different base stations; and
When data is transmitted to the terminal through the data session, a transmission ratio of each transmission path is determined between the terminal and the two or more base stations based on the size of the data and radio environment information of each base station, and a scheduling unit that enables transmission through the two or more base stations according to the transmission rate of the transmission path,
The scheduling unit,
By differently utilizing the radio environment information of each base station according to whether the data size satisfies a condition smaller than the buffer size of the first base station among the two or more base stations,
determining a transmission rate of each transmission path for transmitting the entire data to the first base station or a transmission rate of each transmission path for distributing the data to the two or more base stations;

The scheduling unit,
When the condition is satisfied, it is checked from the radio environment information of the first base station whether a specific situation related to radio quality deterioration for the first base station occurs, and when the occurrence of the specific situation is confirmed, the data is distributed to the two or more base stations determining a transmission rate of each transmission path for transmission, and determining a transmission rate of each transmission path through which the entire data is transmitted to the first base station if the occurrence of the specific situation is not confirmed;
When the condition is not satisfied, it is checked whether a specific situation related to radio quality degradation for the second base station has occurred from the radio environment information of the second base station among the two or more base stations, and when the occurrence of the specific situation is confirmed, the first base station is sent to the first base station Determining a transmission rate of each transmission path through which the entire data is transmitted, and determining a transmission rate of each transmission path through which the data is distributed and transmitted to the two or more base stations when the occurrence of the specific situation is not confirmed scheduling device. The method of claim 1,
The information confirmation unit,
Defined for transmitting radio environment information including at least one of radio resource usage rate of the base station, hand-off or cell change, and radio access failure between base stations of different communication methods. A scheduling apparatus, characterized in that by using a specific message to check the radio environment information. delete delete delete The method of claim 1,
The scheduling unit,
A scheduling apparatus, characterized in that when determining a transmission ratio of each transmission path for distributing the data to the two or more base stations, the determination is made based on a buffer size of each of the two or more base stations. The method of claim 1,
The scheduling unit,
When the speed of the second base station decreases while the data is being transmitted according to the transmission rate of each transmission path determined to be distributed to the two or more base stations, the radio resource usage rate confirmed from the radio environment information of each base station and each base station A scheduling device, characterized in that the transmission rate of each transmission path is adjusted using the packet loss rate of . 8. The method of claim 7,
The scheduling unit,
The radio channel performance of each base station is determined using the radio resource usage rate confirmed from the radio environment information of each base station and the packet loss rate of each base station, and the radio channel performance of each base station and the transmission rate of each base station are determined. Based on the calculation, the transmission ratio of each transmission path for distributing the data to the two or more base stations is calculated,
and adjusting the transmission ratio of each transmission path by using the predetermined transmission ratio of each transmission path and the calculated transmission ratio of each transmission path. The method of claim 1,
The two or more base stations,
A packet data convergence protocol (PDCP) layer is the same, and a radio link control (RLC) layer and a lower layer of the RLC layer are different base stations from each other.

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