KR102354589B1 - Method and apparatus of accelerating data processing in a wireless communication system - Google Patents

Abstract

The present disclosure relates to a communication technique that converges a 5G communication system for supporting a higher data rate after a 4G system with IoT technology, and a system thereof. The present disclosure provides intelligent services (eg, smart home, smart building, smart city, smart car or connected car, healthcare, digital education, retail business, security and safety related services, etc.) based on 5G communication technology and IoT-related technology. ) can be applied to
According to an embodiment of the present invention, in a data processing method of a terminal in which dual access is established, acquiring data, determining a cell group for pre-processing the data based on the amount of data and a threshold value, the data Pre-processing the data in the determined cell group before receiving the uplink transmission resource for transmission, and upon receiving the uplink transmission resource, RLC (radio radio) of the pre-processed data based on the uplink transmission resource Link control) It is possible to provide a method comprising the step of determining a serial number and an apparatus for performing the same.

Description

METHOD AND APPARATUS OF ACCELERATING DATA PROCESSING IN A WIRELESS COMMUNICATION SYSTEM

The present invention relates to a method and apparatus for accelerating data processing in a wireless communication system. The present invention relates to an implementation method and apparatus for accelerating data processing of a terminal by applying a data pre-processing technology when a terminal of a next-generation mobile communication system transmits data in an uplink using a dual access technology.

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

On the other hand, the Internet is evolving from a human-centered connection network where humans create and consume information to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. Internet of Everything (IoE) technology, which combines big data processing technology through connection with cloud servers, etc. with IoT technology, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. , M2M), and MTC (Machine Type Communication) are being studied. In the IoT environment, an intelligent IT (Internet Technology) service that collects and analyzes data generated from connected objects and creates new values in human life can be provided. IoT is a field of smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc. can be applied to

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

Meanwhile, in a next-generation communication system, various studies are being conducted to improve data processing speed in order to achieve the above object.

The next-generation mobile communication system must be able to support data rates of up to 20 Gbps in downlink and up to 10 Gbps in uplink, and requires a very short delay response time. Therefore, in the case of a terminal receiving a service in a next-generation mobile communication system, the processing speed of data to be transmitted and received must be very fast. Therefore, a method of accelerating data processing of a terminal is very important, and in particular, a dual access technology may be very useful in high-speed data transmission. Since it can be advantageous for high-speed data transmission by applying a data pre-processing technology capable of accelerating data processing in the dual access technology, in the present invention, a data pre-processing technology capable of accelerating data processing in a terminal in a dual access environment can be implemented. propose about

The LTE system is different from the next-generation mobile communication system in data processing structure. Specifically, the LTE system has a concatenation (RLC concatenation) function in a radio link control (RLC) layer, so that the UE cannot perform any data pre-processing until it receives an uplink transmission resource from the network. , upon receiving an uplink transmission resource, the PDCP (packet data convergence protocol) layer concatenates PDCP PDUs (packet data units) to create one RLC PDU, and sends it to the MAC (medium access control) layer to perform data transmission. On the other hand, in the next-generation mobile communication system, since there is no RLC concatenation function in the RLC layer, the RLC layer processes the PDCP PDU delivered from the PDCP layer before receiving the uplink transmission resource, makes it an RLC PDU, and sends it to the MAC layer. It has a data processing structure in which MAC subheaders and MAC SDUs can be created in advance.

Therefore, since the data pre-processing technology is applicable to the next-generation mobile communication system, an embodiment of the present invention proposes a method and an apparatus for effectively implementing the technology even in a dual access environment.

According to an embodiment of the present invention, in a data processing method of a terminal in which dual access is established,

acquiring data; determining a cell group for pre-processing the data based on the amount of data and a threshold value; pre-processing the data in the determined cell group before receiving an uplink transmission resource for transmitting the data; and when receiving the uplink transmission resource, determining a radio link control (RLC) serial number of the pre-processed data based on the uplink transmission resource.

In addition, according to an embodiment of the present invention, in a terminal in which dual connectivity is established, a transceiver for transmitting and receiving a signal and data are acquired, and a cell group for pre-processing the data based on the amount of data and a threshold value is selected. is determined, the data is pre-processed in the determined cell group before receiving the uplink transmission resource for transmitting the data, and when the uplink transmission resource is received, the pre-processed based on the uplink transmission resource It is possible to provide a terminal including a controller for controlling to determine a radio link control (RLC) serial number of data.

According to an embodiment of the present invention, it is possible to provide a method and apparatus for accelerating data processing in a wireless communication system.

In addition, according to an embodiment of the present invention, a method for implementing an effective data pre-processing technology capable of accelerating data processing in a terminal in a dual access environment can be proposed to support a high data rate to the terminal.

1 is a diagram illustrating the structure of an LTE system.
2 is a diagram illustrating a radio protocol structure in an LTE system.
3 is a diagram illustrating a structure of a next-generation mobile communication system according to an embodiment of the present invention.
4 is a diagram illustrating a radio protocol structure of a next-generation mobile communication system according to an embodiment of the present invention. .
5A and 5B are diagrams illustrating a structure for processing data in an LTE system.
6A and 6B are diagrams illustrating a structure for processing data in a next-generation mobile communication system according to an embodiment of the present invention.
7A, 7B, and 7C are diagrams illustrating a method of performing a terminal data pre-processing operation in dual access according to an embodiment of the present invention.
8A, 8B and 8C are diagrams illustrating a first embodiment of implementing a terminal data pre-processing operation in multiple access according to an embodiment of the present invention.
9A and 9B are diagrams illustrating a second embodiment of implementing a terminal data pre-processing operation in multiple access according to an embodiment of the present invention.
10A, 10B, and 10C are diagrams illustrating a third embodiment of implementing a terminal data pre-processing operation in multiple access according to an embodiment of the present invention.
11 is a diagram illustrating the operation of the terminal according to the first embodiment for implementing the terminal data pre-processing operation in multiple access according to an embodiment of the present invention.
12 is a diagram illustrating the operation of a terminal according to a second embodiment of implementing the terminal data pre-processing operation in multiple access according to an embodiment of the present invention.
13 is a diagram illustrating an operation of a terminal according to a third embodiment of implementing a terminal data pre-processing operation in multiple access according to an embodiment of the present invention.
14 is a view showing modified implementation methods of the first, second, and third embodiments of the present invention.
15 is a diagram illustrating a structure of a terminal according to an embodiment of the present invention.
16 is a diagram illustrating a block configuration of a TRP in a wireless communication system according to an embodiment of the present invention.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. And, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

In the following description of the present invention, if it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

A term for identifying an access node used in the following description, a term referring to network entities, a term referring to messages, a term referring to an interface between network objects, a term referring to various identification information and the like are exemplified for convenience of description. Accordingly, the present invention is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

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

1 is a diagram showing the structure of an LTE system to which the present invention can be applied.

1, as shown, the radio access network of the LTE system is a next-generation base station (Evolved Node B, hereinafter ENB, Node B or base station) (105, 110, 115, 120) and MME (125, Mobility Management Entity) and S-GW (130, Serving-Gateway). A user equipment (User Equipment, hereinafter, UE or terminal) 135 accesses an external network through ENBs 105 to 120 and S-GW 130 .

In FIG. 1 , ENBs 105 to 120 correspond to existing Node Bs of a universal mobile telecommunication system (UMTS) system. The ENB is connected to the UE 135 through a radio channel and performs a more complex role than the existing Node B. In the LTE system, all user traffic, including real-time services such as VoIP (Voice over IP) through the Internet protocol, are serviced through a shared channel, so status information such as buffer status, available transmission power status, and channel status of UEs A device for scheduling is required, and the ENB (105 to 120) is responsible for this. One ENB typically controls multiple cells. For example, in order to implement a transmission rate of 100 Mbps, the LTE system uses, for example, orthogonal frequency division multiplexing (OFDM) in a 20 MHz bandwidth as a radio access technology. In addition, an Adaptive Modulation & Coding (AMC) method that determines a modulation scheme and a channel coding rate according to the channel state of the terminal is applied. The S-GW 130 is a device that provides a data bearer, and creates or removes a data bearer under the control of the MME 125 . The MME 125 is a device in charge of various control functions as well as a mobility management function for the terminal, and is connected to a plurality of base stations.

2 is a diagram illustrating a radio protocol structure in an LTE system to which the present invention can be applied.

Referring to FIG. 2, the radio protocol of the LTE system consists of Packet Data Convergence Protocol 205 and 240 (PDCP), Radio Link Control 210, 235 (RLC), and Medium Access Control 215, 230 (MAC) in the UE and ENB, respectively. The Packet Data Convergence Protocol (PDCP) 205 and 240 is in charge of IP header compression/restore operations. The main functions of PDCP are summarized below.

- Header compression and decompression (ROHC only)

- Transfer of user data

- In-sequence delivery of upper layer PDUs at PDCP re-establishment procedure for RLC AM

- Order reordering function (For split bearers in DC (only support for RLC AM): PDCP PDU routing for transmission and PDCP PDU reordering for reception)

- Duplicate detection of lower layer SDUs at PDCP re-establishment procedure for RLC AM

- Retransmission function (Retransmission of PDCP SDUs at handover and, for split bearers in DC, of PDCP PDUs at PDCP data-recovery procedure, for RLC AM)

- Ciphering and deciphering

- Timer-based SDU discard in uplink.

The radio link control (Radio Link Control, hereinafter referred to as RLC) 210 and 235 reconfigures a PDCP packet data unit (PDU) to an appropriate size to perform ARQ operation and the like. The main functions of RLC are summarized below.

- Data transfer function (Transfer of upper layer PDUs)

- ARQ function (Error Correction through ARQ (only for AM data transfer))

- Concatenation, segmentation and reassembly of RLC SDUs (only for UM and AM data transfer)

- Re-segmentation of RLC data PDUs (only for AM data transfer)

- Reordering of RLC data PDUs (only for UM and AM data transfer)

- Duplicate detection (only for UM and AM data transfer)

- Protocol error detection (only for AM data transfer)

- RLC SDU discard function (RLC SDU discard (only for UM and AM data transfer))

- RLC re-establishment function (RLC re-establishment)

The MACs 215 and 230 are connected to several RLC layer devices configured in one terminal, and perform operations of multiplexing RLC PDUs into MAC PDUs and demultiplexing RLC PDUs from MAC PDUs. The main functions of MAC are summarized below.

- Mapping function (Mapping between logical channels and transport channels)

- Multiplexing/demultiplexing of MAC SDUs belonging to one or different logical channels into/from transport blocks (TB) delivered to/from the physical layer on transport channels)

- Scheduling information reporting function (Scheduling information reporting)

- HARQ function (Error correction through HARQ)

- Priority handling between logical channels of one UE

- Priority handling between UEs by means of dynamic scheduling

- MBMS service identification

- Transport format selection

- Padding function

The physical layers 220 and 225 channel-code and modulate upper-layer data, make OFDM symbols and transmit them over a wireless channel, or demodulate and channel-decode an OFDM symbol received through a wireless channel, and deliver to the upper layers. .

3 is a diagram illustrating the structure of a next-generation mobile communication system to which the present invention can be applied.

3, as shown, the radio access network of the next-generation mobile communication system (hereinafter NR or 5G) is a next-generation base station (New Radio Node B, hereinafter, NR gNB or NR base station) 310 and NR CN (305, New Radio Core Network). A user terminal (New Radio User Equipment, hereinafter NR UE or terminal) 315 accesses an external network through the NR gNB 310 and the NR CN 305 .

In FIG. 3 , the NR gNB 310 corresponds to an Evolved Node B (eNB) of the existing LTE system. The NR gNB is connected to the NR UE 315 through a radio channel and can provide a service superior to that of the existing Node B. In the next-generation mobile communication system, since all user traffic is serviced through a shared channel, a device for scheduling by collecting status information such as buffer status, available transmission power status, and channel status of UEs is required. (310) is in charge. One NR gNB typically controls multiple cells. In order to implement ultra-high-speed data transmission compared to the current LTE, it can have more than the existing maximum bandwidth, and additionally beamforming technology can be grafted by using Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) as a radio access technology. . In addition, an Adaptive Modulation & Coding (AMC) method that determines a modulation scheme and a channel coding rate according to the channel state of the terminal is applied. The NR CN 305 performs functions such as mobility support, bearer setup, QoS setup, and the like. NR CN is a device in charge of various control functions as well as mobility management functions for the terminal and is connected to a number of base stations. In addition, the next-generation mobile communication system can be interlocked with the existing LTE system, and the NR CN is connected to the MME 325 through a network interface. MME is connected to the existing base station eNB (330).

4 is a diagram illustrating a radio protocol structure of a next-generation mobile communication system to which the present invention can be applied.

Referring to FIG. 4 , the radio protocol of the next-generation mobile communication system consists of NR PDCPs 405 and 440 , NR RLCs 410 and 435 , and NR MACs 415 and 430 in the terminal and the NR base station, respectively. The main functions of the NR PDCPs 405 and 440 may include some of the following functions.

Header compression and decompression (ROHC only)

- Transfer of user data

- In-sequence delivery of upper layer PDUs

- Order reordering function (PDCP PDU reordering for reception)

- Duplicate detection of lower layer SDUs

- Retransmission of PDCP SDUs

- Ciphering and deciphering

- Timer-based SDU discard in uplink.

In the above, the reordering function of the NR PDCP device refers to a function of reordering PDCP PDUs received from a lower layer in order based on a PDCP sequence number (SN), and a function of delivering data to the upper layer in the reordered order may include In addition, the reordering function of the NR PDCP device may include a function of reordering the order to record the lost PDCP PDUs, and may include a function of reporting a status on the lost PDCP PDUs to the transmitting side, and the loss It may include a function of requesting retransmission of PDCP PDUs.

The main functions of the NR RLCs 410 and 435 may include some of the following functions.

- Data transfer function (Transfer of upper layer PDUs)

- In-sequence delivery of upper layer PDUs

- Out-of-sequence delivery of upper layer PDUs

- ARQ function (Error Correction through ARQ)

- Concatenation, segmentation and reassembly of RLC SDUs

- Re-segmentation of RLC data PDUs

- Reordering of RLC data PDUs

- Duplicate detection

- Protocol error detection

- RLC SDU discard function (RLC SDU discard)

- RLC re-establishment function (RLC re-establishment)

In the above, in-sequence delivery of the NR RLC device refers to a function of sequentially delivering RLC SDUs received from a lower layer to an upper layer, and one RLC SDU is originally divided into several RLC SDUs and received If it is, it may include a function to reassemble and deliver it. In addition, the sequential delivery function of the NR RLC device may include a function of rearranging the received RLC PDUs based on an RLC sequence number (SN) or a PDCP sequence number (SN), and rearranging the order to record the lost RLC PDUs It may include a function to In addition, the sequential delivery function of the NR RLC device may include a function of reporting a status on the lost RLC PDUs to the transmitting side, and may include a function of requesting retransmission for the lost RLC PDUs. When there is a lost RLC SDU, it may include a function of sequentially delivering only RLC SDUs before the lost RLC SDU to a higher layer. In addition, the sequential delivery function of the NR RLC device may include a function of sequentially delivering all RLC SDUs received before the timer starts to a higher layer if a predetermined timer expires even if there are lost RLC SDUs, or Even if there are RLC SDUs, if a predetermined timer has expired, a function of sequentially transferring all RLC SDUs received up to now to a higher layer may be included. In addition, the RLC PDUs may be processed in the order in which they are received (in the order of arrival, regardless of the sequence number and sequence number) and delivered to the PDCP device out of sequence (out-of sequence delivery). Segments stored in the buffer or to be received later are received, reconstructed into one complete RLC PDU, processed and delivered to the PDCP device. The NR RLC layer may not include a concatenation function, and the function may be performed in the NR MAC layer or replaced with a multiplexing function of the NR MAC layer.

In the above, the out-of-sequence delivery function of the NR RLC device refers to a function of directly delivering RLC SDUs received from a lower layer to a higher layer regardless of order, and one RLC SDU originally has several RLCs. When it is received after being divided into SDUs, it may include a function of reassembling it and delivering it, and it may include a function of storing the RLC SN or PDCP SN of the received RLC PDUs, arranging the order, and recording the lost RLC PDUs. can

The NR MACs 415 and 430 may be connected to several NR RLC layer devices configured in one terminal, and the main function of the NR MAC may include some of the following functions.

- Mapping function (Mapping between logical channels and transport channels)

- Multiplexing/demultiplexing of MAC SDUs

- Scheduling information reporting function (Scheduling information reporting)

- HARQ function (Error correction through HARQ)

- Priority handling between logical channels of one UE

- Priority handling between UEs by means of dynamic scheduling

- MBMS service identification

- Transport format selection

- Padding function

The NR PHY layers 420 and 425 channel-code and modulate the upper layer data, make an OFDM symbol and transmit it to the radio channel, or demodulate the OFDM symbol received through the radio channel, decode the channel, and deliver the operation to the upper layer. can be done

5A and 5B are diagrams illustrating a structure for processing data in an LTE system. Hereinafter, FIGS. 5A and 5B are collectively referred to as FIG. 5 .

As shown in FIG. 5 , in the LTE system, data processing of the PDCP layer and the RLC layer is performed for each logical channel. That is, logical channel 1 505 and logical channel 2 510 have different PDCP layers and RLC layers and perform independent data processing. Then, the RLC PDU generated from the RLC layer of each logical channel is delivered to the MAC layer to form one MAC PDU and then transmitted to the receiving end. In the LTE system, the PDCP layer, the RLC layer, and the MAC layer may include the functions described with reference to FIG. 2 and may perform corresponding operations.

The LTE system may be characterized in that the PDCP PDU is concatenated in the RLC layer in the RLC layer. As shown in 525, in the MAC PDU structure, all MAC subheaders are located in the front part, and the MAC SDU part is located in the rear part of the MAC PDU. It may be characterized as having Due to the above characteristics, in the LTE system, data processing cannot be performed or prepared in advance in the RLC layer before receiving an uplink transmission resource (Uplink grant).

When the uplink transmission resource 530 is received as shown in FIG. 5 , the UE concatenates the PDCP PDUs received from the PDCP layer according to the uplink transmission resource to generate an RLC PDU. In the above, after receiving the uplink transmission resource from the base station in the MAC layer, logical channel prioritization (LCP) is performed and the uplink transmission resource is divided for each logical channel, that is, the uplink transmission resource 530 in the above. It is an uplink transmission resource allocated from the MAC layer. In the above, if the size of the PDCP PDUs to be concatenated does not match the uplink transmission resource, the RLC layer performs a segmentation procedure so that the PDCP PDUs fit the uplink transmission resource. The above procedure can be performed for each logical channel, and each RLC device can configure an RLC header using concatenated PDCP PDUs and send the completed RLC PDU to the MAC device. In the above, the MAC device may configure the RLC PDUs (MAC SDUs) received from the respective RLC layers as one MAC PDU and transmit it to the PHY device. When configuring the RLC header in the above, if the RLC device performs a segmentation operation and includes segmented information in the header, length information of each contiguous PDCP PDU may be included in the header (so that the receiving end can reassemble it) to do).

As described above, in the LTE system, data processing of the RLC layer, the MAC layer, and the PHY layer starts in earnest from the point in time when the uplink transmission resource is received.

6A and 6B are diagrams illustrating a structure for processing data in a next-generation mobile communication system according to an embodiment of the present invention. Hereinafter, FIGS. 6A and 6B are collectively referred to as FIG. 6 .

As shown in FIG. 6 , in the next-generation mobile communication system, data processing of the PDCP layer and the RLC layer is performed for each logical channel. That is, logical channel 1 605 and logical channel 2 610 have different PDCP layers and RLC layers and perform independent data processing. Then, the RLC PDU generated from the RLC layer of each logical channel is delivered to the MAC layer to form one MAC PDU and then transmitted to the receiving end. In the next-generation mobile communication system, the PDCP layer, the RLC layer, and the MAC layer may include the functions described with reference to FIG. 4 and perform corresponding operations.

The next-generation mobile communication system may be characterized in that the RLC layer does not concatenate PDCP PDUs in the RLC layer, and as shown in 625, a structure having a MAC subheader for each MAC SDU in the MAC PDU structure, that is, a MAC subheader and a MAC SDU. It may be characterized in that it has a structure that is repeated as a unit. Accordingly, in the next-generation mobile communication system, as in 630, pre-processing may be performed on data in advance even before receiving an uplink transmission resource. That is, before receiving an uplink transmission resource, when the UE receives an IP packet from the PDCP layer, it performs PDCP processing (ciphering, integrity protection, etc.) on the IP packet and generates a PDCP header to generate a PDCP PDU can create In addition, the UE may transmit the PDCP PDU to the RLC layer to configure an RLC header and RLC PDU, and transmit the RLC PDU to the MAC layer to configure a MAC subheader and MAC SDU in advance.

If the terminal receives the uplink transmission resource ( 630 ), the terminal may configure the MAC PDU by bringing MAC subheaders and MAC SDUs as much as they fit the size of the uplink transmission resource. If the uplink transmission resource is not sufficient, the UE may perform a split operation to efficiently use the transmission resource by filling it up. In addition, the RLC header (segmented information or length information) and the MAC header (the L field, since the length has been changed) corresponding to the division operation may be updated ( 640 ). Therefore, compared with the LTE system, assuming that uplink transmission resources are received at the same time, such as 630 and 645, the next-generation mobile communication system can have a large gain in processing time, such as 635. This is because, in the LTE system, the pre-processing operation cannot be performed before receiving the uplink transmission resource, but in the next-generation mobile communication system, the pre-processing operation can be performed before receiving the uplink transmission resource. In the above, the RLC layer and the PDCP layer may use one common serial number if necessary or configured in the network.

In the above, the pre-processing operation may be performed for each logical channel, and the RLC PDUs pre-processed for each logical channel may be pre-processed into MAC SDUs and MAC subheaders again in the MAC layer. In addition, upon receiving the uplink transmission resource 630 from the MAC layer, the UE may allocate the uplink transmission resource for each logical channel to multiplex MAC SDUs and MAC subheaders generated in advance. In the above, after receiving the uplink transmission resource from the base station in the MAC layer, logical channel prioritization (LCP) is performed and the uplink transmission resource is divided for each logical channel. In addition, one MAC PDU is configured by multiplexing MAC SDUs and MAC subheaders generated for each logical channel and delivered to the PHY layer. In the above, if the uplink transmission resource allocated to each logical channel is not sufficient, a split request can be made to the RLC layer, and when the RLC layer performs a segmentation operation, the divided information is included in the header and updated again. If delivered to the MAC layer, the MAC layer can update the corresponding MAC header.

As described above, in the next-generation mobile communication system, data processing of the PDCP layer, the RLC layer, and the MAC layer can be performed even before the uplink transmission resource is received.

[Data pre-processing operation in terminal connection]

Embodiments of the present invention may apply a data pre-processing process in a next-generation mobile communication system. The data pre-processing may be performed in one transmission time interval (TTI) or up to the maximum amount of data that can be transmitted in one transmission. That is, data pre-processing may be performed up to the maximum allocable uplink transmission resource (maximum allowable UL grant or the largest UL grant). In addition, the time point at which the data pre-processing is performed may include, for example, one or more of the following cases.

1. Data pre-processing may be performed when the amount of current pre-processed data is less than the amount of maximally allocable uplink transmission resources described above.

2. Data pre-processing can be performed periodically based on a certain period of time.

3. Using uplink transmission resources, the MAC layer configures a MAC PDU, and data pre-processing can be performed when data is delivered to the PHY layer.

4. Data pre-processing may be performed after data is transmitted with the UL grant.

5. When an indicator to perform data pre-processing is received from a lower layer, it can be received.

According to one of the above-described time points, the terminal may perform data pre-processing. Also, if necessary, the terminal may perform data pre-processing according to several of the above-described time points.

[Method of performing terminal data pre-processing operation in multiple access]

When a split bearer (uplink split bearer, 710, 720, 730, 740) is specifically configured in a multiple access or dual connectivity environment (as shown in FIG. 7, a bearer for a master cell group and a bearer for a secondary cell group) is divided in the PDCP layer), in order to perform data pre-processing, the terminal transmits the data of the PDCP layer between a master cell group (MCG) and a secondary cell group (SCG) in advance. should be able to decide That is, since the RLC serial number needs to be allocated during the data pre-processing process, data pre-processing can be performed only by determining in advance which cell group data of the PDCP layer is to be transmitted. If data is not specified in advance to which cell group to send data, data pre-processing may not be possible (it may be possible by using the data partial pre-processing proposed below, and a large data pre-processing gain can be obtained. have). Since the RLC layer device corresponding to each cell group allocates an independent RLC serial number, to which cell group the PDCP data (PDCP PDU) is to be transmitted must be determined in advance. Methods of pre-allocating PDCP layer data to the master cell group and the secondary cell group in the dual access environment are as follows.

7A, 7B, and 7C are diagrams illustrating a method of performing a terminal data pre-processing operation in dual access according to an embodiment of the present invention. Hereinafter, FIGS. 7A, 7B and 7C are collectively referred to as FIG. 7 .

1. First allocation method 710: When the amount of data of the PDCP layer is smaller than a set threshold value (in the case of state 711 in FIG. 7), the UE pre-transmits the data of the PDCP layer into a master cell group and a secondary cell group do not allocate In addition, data pre-processing is performed only on the data within the threshold value in the master cell group (or in the secondary cell group or in the cell group previously set by the base station).

When the amount of data in the PDCP layer is greater than the threshold value (in the case of state 713 of FIG. 7 ), data pre-processing is not performed on the data exceeding the threshold value. The UE reports the buffer status to the master cell group and the secondary cell group for the current PDCP layer data amount, and when an uplink transmission resource is received for each cell group, the UE transmits the PDCP layer data according to the uplink transmission resource to the master cell group. and secondary cell group, and data processing and transmission can be performed. That is, the terminal may first process and transmit data to a base station to which an uplink transmission resource (UL grant) is allocated. The threshold may be assigned a value capable of representing a low data rate or small data, and may be set when the RRC connection is established by the network (or base station).

2. Allocation method of 1-1 (720): When the amount of data of the PDCP layer is less than a set threshold value (in the case of state 721 in FIG. 7 ), the terminal divides the data of the PDCP layer into the master cell group and the secondary cell group do not pre-allocate In addition, data pre-processing is performed only on the data within the threshold value in the master cell group (or in the secondary cell group or in the cell group previously set by the base station).

When the amount of data in the PDCP layer is greater than the threshold value (in the case of 723 state in FIG. 7), the data that exceeds the threshold value is pre-processed only for the master cell group (or the secondary cell group or the cell group set in advance by the base station) can be performed. For example, the terminal performs data pre-processing on data as much as a threshold value only for the master cell group (or the secondary cell group or the cell group set in advance by the base station), and for data above the threshold, the master cell group and the secondary cell The buffer status report is reported to the group, and when an uplink transmission resource is received for each cell group, the PDCP layer data is allocated to the master cell group and the secondary cell group according to the uplink transmission resource, and data processing is performed and transmission is performed. can The threshold may be assigned a value capable of representing a low data rate or small data, and may be set when the RRC connection is established by the network (or base station).

3. Allocation method of 1-2 (730): When the amount of data of the PDCP layer is smaller than the set threshold value (in the case of 731 in FIG. 7), the UE divides the data of the PDCP layer into the master cell group and the secondary cell group do not pre-allocate In addition, data pre-processing is performed only on the data within the threshold value in the master cell group (or in the secondary cell group or in the cell group previously set by the base station).

When the amount of data in the PDCP layer is greater than the threshold value (in the case of state 733 of FIG. 7 ), pre-processing may be performed in the master cell group and the secondary cell group. For example, the terminal performs data pre-processing on data as much as the threshold value for the master cell group (or the secondary cell group or the cell group set in advance by the base station) for data that exceeds the threshold value, and data above the threshold value Data pre-processing may be performed on the secondary cell group (or the master cell group or the cell group not previously set by the base station) by the size of the maximum allocable uplink transmission resource of the secondary cell group. And for the remaining data, buffer status report is performed to the master cell group and the secondary cell group, and when an uplink transmission resource is received for each cell group, the PDCP layer data is divided into the master cell group and the secondary cell group according to the uplink transmission resource. It can allocate, perform data processing, and perform transfers. The threshold may be assigned a value capable of representing a low data rate or small data, and may be set when the RRC connection is established by the network (or base station).

4. Second allocation method 740: When the amount of data of the PDCP layer is smaller than a set threshold value (in the case of 741 state in FIG. 7), the UE pre-sets the data of the PDCP layer into a master cell group and a secondary cell group. do not allocate In addition, data pre-processing is performed only in the master cell group (or secondary cell group) for data within the threshold value.

When the amount of data in the PDCP layer is greater than the threshold value (in the case of state 743 in FIG. 7), the current PDCP layer and the master cell group in advance according to a predetermined split ratio set by the network or the base station with respect to all data of the PDCP layer. It can be allocated to the secondary cell group (or data as much as a threshold value is pre-processed as the master cell group, and data above the threshold value is pre-processed according to a predetermined split ratio between the master cell group and the secondary cell group. After allocating to , data preprocessing can be performed). And with respect to the pre-allocated data, the terminal may perform data pre-processing for each cell group before the uplink transmission resource is allocated to each cell group. And for the remaining data, buffer status report is performed to the master cell group and the secondary cell group, and when an uplink transmission resource is received for each cell group, the PDCP layer data is divided into the master cell group and the secondary cell group according to the uplink transmission resource. It can allocate, perform data processing, and perform transfers. The threshold value is a value capable of representing a low data rate or small data and may be set when RRC connection establishment is performed by the network (or base station), and the predetermined ratio considers the network and base station resource status. Therefore, it may be established when RRC connection establishment is performed by the network (or base station).

In an embodiment of the present invention, one of the above four methods may be applied so that a terminal in a dual access environment may perform data pre-processing. That is, the data of the PDCP layer can be pre-allocated to the master cell group and/or the secondary cell group in the same way as described above and used for pre-processing.

In the above, the procedure in which the PDCP layer of the terminal compares and determines the amount of data based on the threshold value and pre-allocates data to the master cell group and the secondary cell group is one or a plurality of time points among the time points described below. can start to be carried out in

1. When trying to perform data pre-processing because the amount of current data pre-processed data becomes smaller than the amount of uplink transmission resources that can be maximally allocated,

2. Periodically based on a certain time

3. When the MAC layer configures the MAC PDU by using the uplink transmission resource and transmits the data to the PHY layer,

4. After transmitting data with UL grant

5. When trying to perform data preprocessing by receiving an indication to perform data preprocessing from a lower layer

6. Whenever new data is received in the PDCP layer

7. When receiving an indication to perform data allocation to the master cell group and the secondary cell group from the lower layer

8. When the amount of data exceeds a certain threshold in the PDCP layer

In the above, when comparing the data amount of the PDCP layer and the threshold value each time, the data amount of the PDCP layer may be calculated by the following methods.

1. The first calculation method:

The amount of data in the PDCP data layer that is not transmitted and is not data preprocessed;

The amount of data that is not transmitted and pre-processed data in the master cell group;

The size of the total data that is not transmitted and the amount of data pre-processed in the secondary cell group is calculated and compared with a threshold value.

2. Second calculation method: Calculate the amount of data in the PDCP data layer that is not transmitted and is not pre-processed data, and compares it with a threshold value.

3. Third calculation method: Calculate the amount of the newly received data, excluding data that is not transmitted and calculated when comparing with the threshold value before, and compares it with the threshold value.

4. Fourth calculation method:

The amount of data that is not transmitted and pre-processed data in the master cell group

The size of the total data that is not transmitted and the amount of data pre-processed in the secondary cell group is calculated and compared with a threshold value.

In one of the four methods described above, the UE in the dual access environment may calculate the size of data of the PDCP layer to be compared with the threshold value.

In the above, when the UE in the dual access environment pre-allocates the data of the PDCP layer to the master cell group and the secondary cell group, it may be a principle to allocate so as to have as many consecutive PDCP serial numbers as possible in each cell group. If PDCP serial numbers are not distributed to each cell group, but are assigned to a group of consecutive PDCP serial numbers, the processing time and burden caused by reordering when the PDCP serial number sequence is rearranged in the receiving PDCP layer can be reduced. can

In the method of performing data preprocessing of the terminal in the dual access environment, the method of performing data preprocessing of the terminal in the single access environment may be applied to each cell group to perform data preprocessing. That is, when performing data pre-processing in each cell group, the maximum transport block size or the maximum allocable uplink transmission resource size (Maximum allowable UL grant) or the maximum amount of data that can be transmitted within one TTI. Data preprocessing can be performed as much as possible. That is, even if only this amount of data pre-processing is performed, the maximum data pre-processing gain for the next data transmission can be obtained. In the method of performing data pre-processing of the terminal in the dual access environment, the threshold value or a predetermined split ratio may be set by the base station to the terminal in an RRC message (RRCConnectionSetup or RRCConnectionReconfiguration), and dynamically as an RRC message (RRCConnectionReconfiguration ) You may be able to reset it. In addition, in order to dynamically allocate a threshold value or a predetermined ratio (split ratio), a PDCP Control PDU or a MAC CE (control element) is newly defined and the threshold value or a predetermined ratio (split ratio) is newly defined using the PDCP Control PDU or MAC CE. ) can be updated.

In the method of performing data preprocessing of the terminal in the dual access environment, the threshold value is the maximum transport block size of the master cell group or the maximum allocable uplink transmission resource size (Maximum allowable UL grant) or one TTI There is a need to be set by the base station to be larger than the size of data that can be transmitted in the maximum. Because the threshold value must be set larger than the maximum transport block size, the maximum allocatable UL grant, or the maximum size of data that can be transmitted within one TTI, the next data transmission is performed. This is because it is possible to obtain the maximum data preprocessing gain for

In the dual access environment, the UE may be configured to send data of the PDCP layer to different cell groups by duplicating the data of the PDCP layer. can

[Method of implementing terminal data pre-processing operation in multiple access]

8A, 8B and 8C are diagrams illustrating a first embodiment of implementing a terminal data pre-processing operation in multiple access according to an embodiment of the present invention. Hereinafter, FIGS. 8A, 8B and 8C are collectively referred to as FIG. 8 .

In FIG. 8 , the first embodiment for implementing the terminal data pre-processing operation in dual access may be characterized in that it has a separate buffer for each cell group and a separate mapping table. In the above, the separate buffers may mean logically separated buffers, may mean different buffers on a memory address, and may mean the same buffers in hardware but logically separated buffers. It may mean a separate buffer separated by . The first embodiment is a method of implementing the first allocation method for performing data pre-processing in the dual access environment.

That is, when the terminal receives the IP packet from the PDCP layer device, it may be configured as a PDCP PDU and stored in the first buffer ( 805 ). When the data amount of the first buffer is smaller than the set threshold value ( 805 ), data of the PDCP layer is not allocated in advance to the master cell group and the secondary cell group. In addition, data preprocessing is performed only on the data within the threshold value in the master cell group (or in the secondary cell group or in the cell group previously set by the base station) ( 810 ).

When the amount of data in the PDCP layer exceeds the threshold value, data pre-processing is not performed on the corresponding data when the amount of data exceeds the threshold value ( 815 ). The UE reports the buffer status to the master cell group and the secondary cell group for the current PDCP layer data amount, and when an uplink transmission resource is received for each cell group, it masters the PDCP layer data according to the received uplink transmission resource. It is assigned to a cell group and a secondary cell group. The terminal may perform data processing on data allocated to each cell group, store it in a buffer corresponding to each cell group (second buffer 825, third buffer 830), and perform transmission (820). That is, first, data may be processed and transmitted to a base station (cell group) to which an uplink transmission resource (UL grant) is allocated. The threshold may be assigned a value capable of representing a low data rate or small data, and may be set when the RRC connection is established by the network (or base station).

In the above, separate mapping information for each cell group may be configured as mapping tables 825 and 830 . Each mapping table may be configured based on an RLC sequence number (SN, sequence number) (it may be configured based on a PDCP sequence number). Each mapping table may indicate a mapping relationship with a memory address between the first buffer and the second buffer or the third buffer, and may store segmentation information (seg. Info) when a segmentation operation is performed, , in the case of the RLC AM mode to which the RLC ARQ function is applied, ACK/NACK information may be recorded. In addition to the mapping information of the memory address, it is also possible to record mapping information between the RLC serial number and the PDCP serial number by adding a PDCP serial number field.

In step 820 of the first embodiment (FIG. 8) for implementing the terminal data pre-processing operation in the dual access, data pre-processing in the RLC device and the MAC device corresponding to each cell group before receiving the uplink transmission resource from each cell group By performing the process (820-2), the 1-1 allocation method, the 1-2 allocation method, and the second allocation method for enabling data pre-processing in the dual access environment can be implemented. That is, according to the 1-1 allocation method, pre-processing may be performed only for a preset cell group, and according to the 1-2 allocation method, a threshold value or an uplink transmittable at once in the master cell group and the secondary cell group The pre-processing may be performed based on the amount, and the master cell group and the secondary cell group may perform the pre-processing according to a preset ratio according to the second allocation method. The pre-processed data may be managed through the mapping table as described with reference to 825 and 830 .

9A and 9B are diagrams illustrating a second embodiment of implementing a terminal data pre-processing operation in multiple access according to an embodiment of the present invention. Hereinafter, FIGS. 9A and 9B are collectively referred to as FIG. 9 .

In FIG. 9 , a second embodiment for implementing the terminal data preprocessing operation in dual access may be characterized in that it does not have a separate buffer for each cell group, but has one integrated buffer and has an integrated mapping table. In the above, the integrated buffer may mean a logically integrated buffer, may mean different buffers on a memory address, and may mean a logically integrated buffer although actually different in hardware. It can also mean an integrated buffer. The second embodiment is a method for implementing the first allocation method, the 1-1 allocation method, the 1-2 allocation method, and the second allocation method for performing data pre-processing in the dual access environment. to be. In particular, the second embodiment may be more suitable for implementing the second allocation method.

When the amount of data of the PDCP layer is less than a set threshold value, the UE does not pre-allocate the data of the PDCP layer to the master cell group and the secondary cell group. In addition, data pre-processing is performed only on the data within the threshold value in the master cell group (or in the secondary cell group or in a pre-designated cell group). That is, when the amount of data of the PDCP layer is smaller than a set threshold value, it can be implemented in the same manner as in the first embodiment.

When the amount of data in the PDCP layer exceeds the threshold value (905), the current PDCP layer is divided into a master cell group and a secondary cell group in advance according to a predetermined split ratio set by the network or base station with respect to the entire data 905 of the PDCP layer. (or data as much as a threshold value is pre-processed as a master cell group, and data above a threshold value is allocated to a master cell group and a secondary cell group in advance according to a predetermined split ratio) Data pre-processing may be performed or data pre-processing may be performed for the entire data by the maximum receivable UL grant amount for each cell group) (910). In addition, with respect to data previously decided to be transmitted to each cell group, the UE may perform data pre-processing for each cell group before an uplink transmission resource is allocated to each cell group. That is, it is possible to allocate an RLC serial number, configure an RLC header and a MAC header in advance, and store pre-processed data for each cell group in the second buffer ( 915 ). In the above, the RLC serial number may be a virtual RLC serial number. That is, it may be an RLC serial number temporarily designated according to a ratio set by the network or by the maximum UL grant amount of each cell group. Therefore, when an uplink transmission resource (UL grant) is actually received for each cell group, the RLC serial number may be reallocated according to the received uplink transmission resource. If the pre-allocated virtual RLC serial number matches well with the actually allocated uplink transmission resource, there is no need to re-allocate the RLC serial number. For example, when the amount of uplink transmission resources allocated to each cell group is smaller than the amount pre-processed in each cell group, it may be necessary to reallocate the RLC serial number.

As described above, after performing data pre-processing for each cell group, when uplink transmission resources are actually performed from each cell group, the terminal compares the actually received uplink transmission resource with the amount of data pre-processed, and then transmits the received uplink transmission resource. A virtual RLC serial number may be reallocated so that data may be sequentially transmitted to the resource ( 925 ). Accordingly, RLC serial numbers may be reassigned to some of the data pre-processed, and data may be transmitted according to the size of each uplink transmission resource. If necessary, when the size of the transmission resource does not match the size of the pre-processed data, the division operation may be performed.

A virtual RLC serial number may be reassigned to the pre-processed data remaining after the data pre-processed data is transmitted to each cell group. The virtual RLC serial numbers mean that RLC serial numbers are allocated again for the next UL grant (930).

After receiving the next UL grant from each cell group, the above procedure may be repeated.

For the implementation of the second embodiment, mapping tables 935 and 940 for managing integrated mapping information may be configured. Each mapping table may be configured based on an RLC sequence number (SN, sequence number) (it may be configured based on a PDCP sequence number). Each mapping table may indicate a mapping relationship with the memory addresses of the first buffer and the second buffer, and when a partition operation is performed, partition information may be stored, and the RLC AM mode to which the RLC ARQ function is applied. In this case, ACK/NACK information may be recorded. In addition to the mapping information of the memory address, it is also possible to record mapping information between the RLC serial number and the PDCP serial number by adding a PDCP serial number field. A new field indicating the location or memory address of each RLC serial number may be added to the mapping table, and a link field indicating each cell group may be added because the integrated mapping table is used. For example, in the link field, 0 may indicate a master cell group, and 1 may indicate a secondary cell group. In addition, the RLC serial number for each cell group is independently managed, independent, and sequentially assigned.

As described above, the UE may allocate a virtual RLC serial number before receiving an uplink transmission resource from each cell group and implement a mapping table as shown in 935. And whenever an uplink transmission resource (UL grant) is received from each cell group, the virtual RLC serial number may be updated as shown in 940. That is, the actual RLC serial number may be reallocated according to the size of the uplink transmission resource, and data may be transmitted to each cell group. After transmitting data corresponding to the UL grant to each cell group, the UE may allocate a new virtual RLC serial number in anticipation of the next UL grant for the remaining data. Predicting the next UL grant means considering a predetermined ratio corresponding to each cell group set by the base station, or the maximum amount of UL grant that can be received in each cell group.

The reason for the need for reassignment of the RLC serial number in the above is that if there is a mismatch between the size of the data pre-processed for each cell group and the size of the actual UL grant in each cell group, performance degradation may occur. Because. For example, 100 kilobytes of data are pre-processed as the first cell group and 100 kilobytes of data are pre-processed as the second cell group. The actual UL grant is 50 kilobytes for the first cell group and 150 kilobytes for the second cell group. If , there may be a delay in the PDCP device at the receiving end because of the 50 kilobytes that were not sent in the first cell group. That is, since there may be a PDCP serial number gap between the 50 kilobyte data received from the first cell group and the 50 kilobyte data received from the second cell group, in order to sequentially transfer it to the upper layer, the 50 kilobytes that have not yet been received There may be delays due to waiting for kilobytes of data. In addition, in the second cell group, only 100 kilobytes are made, but when 150 kilobytes comes as a UL grant, unnecessary padding must be made, so resource waste may occur.

For example, in 935, virtual RLC serial numbers 1, 2, 3, 4, and 5 are generated for link 0, and virtual RLC serial numbers 1 and 2 are generated for link 1, but actual uplink transmission As a result of receiving resource allocation, resources capable of transmitting only resources corresponding to uplink RLC serial numbers 1 and 2 may be allocated to link 0. In this case, it is necessary to update the RLC serial number for the conventionally generated RLC serial number 3 or more and the RLC SN for link 1. When an amount of resources capable of processing RLC SNs 3 and 4 of 935 is allocated through link 1, link 1, RLC SN 1, 2 can be updated. For pre-processed data that cannot allocate resources (data with link 0 and RLC SN of 5 in 935 and data with link 1 and RLC SN corresponding to 1,2), the RLC serial number update (or reallocation) is required. .

Although the second embodiment has been described by taking the second allocation method as an example, the second embodiment is applicable to the first allocation method, the 1-1 allocation method, and the 1-2 allocation method. The second embodiment uses an integrated buffer, allocates a virtual RLC SN to preprocessed data, and updates or reallocates the RLC SN after receiving uplink transmission resources. The first allocation method, the 1-1 allocation method, the 1-2 allocation method, and the second allocation method of the present invention are all applicable.

10A, 10B, and 10C are diagrams illustrating a third embodiment of implementing a terminal data pre-processing operation in multiple access according to an embodiment of the present invention.

A third embodiment for implementing the terminal data preprocessing operation in dual access in FIG. 10 may be characterized in that it does not have a separate buffer for each cell group, but has one integrated buffer and has an integrated mapping table. In the above, the integrated buffer may mean a logically integrated buffer, may mean different buffers on a memory address, and may mean a logically integrated buffer although actually different in hardware. It can also mean an integrated buffer. The third embodiment is a method for implementing the first allocation method, the 1-1 allocation method, the 1-2 allocation method, and the second allocation method for performing data pre-processing in the dual access environment. to be.

When the amount of data of the PDCP layer is less than a set threshold value, the UE does not pre-allocate the data of the PDCP layer to the master cell group and the secondary cell group. In addition, data pre-processing is performed only on the data within the threshold value in the master cell group (or in the secondary cell group or in a pre-designated cell group). That is, when the amount of data of the PDCP layer is smaller than a set threshold value, it can be implemented in the same manner as in the first embodiment.

A third embodiment proposes a data partial pre-processing method. The data part pre-processing method performs all the same procedures as for data pre-processing, but does not allocate an RLC serial number, leaves a space to which an RLC serial number is to be allocated, and does not process (in memory means to leave an empty seat). And the remaining RLC header field and MAC header mean that data is pre-processed. Since the RLC serial number is not reassigned multiple times as in the second embodiment, it is possible to reduce the processing power of the terminal and reduce the burden. Then, the memory address of each RLC serial number is stored, and whenever an uplink transmission resource is received from each cell group, the RLC serial number is allocated using the stored RLC serial number memory address by the size of the data to be transmitted corresponding thereto. can do. Accordingly, in the third embodiment, the data partial pre-processing may be performed at the same time points or under the described conditions when the data pre-processing process described above is performed. In addition, whenever an uplink transmission resource is received from each cell group, an RLC serial number may be allocated and data transmission may be performed.

The data part pre-processing is a method that can be usefully applied in an uplink split bearer (UL split bearer) of a terminal. It can also be usefully applied to a downlink split bearer of a base station.

Even when the amount of data of the PDCP layer is smaller than a set threshold value, the data partial pre-processing method described above may be applied.

When the amount of data in the PDCP layer is greater than the threshold value ( 1005 ), pre-processing may be performed on all data 1005 of the current PDCP layer. For example, the UE may perform data partial pre-processing by the sum of the maximum receivable UL grant amount for each cell group (1010). In the third embodiment, when the terminal performs pre-processing, the RLC header and the MAC header are pre-configured without allocating an RLC serial number, and the data part pre-processed data for each cell group may be stored in the second buffer (1015). ). When the UE actually receives an uplink transmission resource (UL grant) for each cell group, the UE may allocate an RLC serial number according to the received uplink transmission resource.

When an uplink transmission resource is actually received from each cell group after performing the data partial preprocessing as described above, the terminal compares the actually received uplink transmission resource with the amount of data partial preprocessed data, and adds the received uplink transmission resource to the received uplink transmission resource. An RLC serial number may be assigned so that data may be sequentially transmitted (1025). Accordingly, an RLC serial number may be allocated to some of the data part pre-processed data, and data may be transmitted according to the size of each uplink transmission resource. If necessary, when the size of the transmission resource does not match the size of the pre-processed data, the division operation may be performed.

In the above, after the data part preprocessed data is transmitted to each cell group, an RLC serial number is assigned and data transmission is performed after receiving the next UL grant from each cell group for the remaining data part preprocessed data. The above procedure may be repeated.

For the implementation of the third embodiment, mapping tables 1030 and 1035 for managing integrated mapping information may be configured. Each mapping table may be configured based on an RLC sequence number (SN, sequence number) (it may be configured based on a PDCP sequence number). Each mapping table may indicate a mapping relationship with the memory addresses of the first buffer and the second buffer, and when a partition operation is performed, partition information may be stored, and the RLC AM mode to which the RLC ARQ function is applied. In this case, ACK/NACK information may be recorded. In addition to the mapping information of the memory address, it is also possible to record mapping information between the RLC serial number and the PDCP serial number by adding a PDCP serial number field. A new field indicating the location or memory address of each RLC serial number may be added to the mapping table, and a link field indicating each cell group may be added because the integrated mapping table is used. In addition, the RLC serial number for each cell group is independently managed, independent, and sequentially assigned.

As described above, the UE may implement a mapping table as shown in 1030 without allocating an RLC serial number before receiving an uplink transmission resource from each cell group. In addition, an RLC serial number may be allocated whenever an uplink transmission resource (UL grant) is received from each cell group (1035). That is, an RLC serial number may be allocated according to the size of an uplink transmission resource, and data may be transmitted to each cell group. After transmitting data corresponding to the UL grant to each cell group, the UE may allocate an RLC serial number to the remaining data whenever the next UL grant is received. For example, in 1030, data corresponding to PDCP SNs 1 to 7 are pre-processed, but the UE does not allocate RLC SNs. The UE may not allocate a link field either. When an uplink transmission resource is allocated, the UE may allocate an RLC SN and determine a link. For example, it may be assumed that resources capable of transmitting PDCP SNs 1 and 2 are allocated to link 0, and resources capable of transmitting PDCN SNs 3 and 4 are allocated to link 1. In this case, as shown in 935, link 0 and RLC SN 1 and 2 may be allocated to pre-processed data corresponding to PDCP SNs 1 and 2, and link 1, RLC SN 1, 2 to pre-processed data corresponding to PDCP SN 3 and 4, as shown in 935. can be assigned. RLC SNs may be allocated to pre-processed data corresponding to PDCP SNs 5, 6, and 7 when uplink transmission resources are allocated later.

The third embodiment uses an integrated buffer, does not allocate an RLC SN through partial pre-processing, but allocates an RLC SN after receiving an uplink transmission resource. The method of determining data for pre-processing is the first of the present invention All of the allocation method, the 1-1 allocation method, the 1-2 allocation method, and the second allocation method are applicable.

11 is a diagram illustrating the operation of the terminal according to the first embodiment for implementing the terminal data pre-processing operation in multiple access according to an embodiment of the present invention.

Upon receiving the IP packet from the PDCP layer device, the UE may configure it as a PDCP PDU and store it in the first buffer (1105).

The terminal compares the amount of the stored data with a threshold value (1110). The timing of comparing with the threshold value and the method of calculating the amount of data to be compared with the threshold value may follow the above description of the present invention. If the amount of stored data is less than the threshold value, operation 1115 is performed. If the amount of stored data is greater than or equal to the threshold value, operation 1130 is performed.

When the data amount of the first buffer is smaller than the set threshold value ( 1115 ), the UE does not pre-allocate the data of the PDCP layer to the master cell group and the secondary cell group. The UE may perform data pre-processing of data within the threshold only in the master cell group (or the secondary cell group or the cell group configured in advance by the base station). The terminal stores the pre-processed data in the second buffer or the third buffer.

The UE receives a UL grant for the corresponding cell group (1120). The UE may transmit pre-processed data to the corresponding cell group using the received UL grant (1125)

If the amount of data in the PDCP layer is greater than the threshold value, data pre-processing is not performed on the corresponding data when the amount exceeds the threshold value ( 1130 ). The UE reports the buffer status to the master cellgroup and the secondary cellgroup with respect to the data amount of the current PDCP layer.

When an uplink transmission resource is received for each cell group (1k-35), the UE allocates PDCP layer data to a master cell group and a secondary cell group according to the uplink transmission resource, performs data processing, and corresponds to each cell group. is stored in the buffer (the second buffer or the third buffer). The terminal may transmit the processed data based on the received uplink transmission resource (1140). That is, the terminal may first process and transmit data to a base station to which an uplink transmission resource (UL grant) is allocated.

In the terminal operation process 1130 of the first embodiment for implementing the terminal data preprocessing operation in the dual access, data preprocessing in the RLC device and the MAC device corresponding to each cell group before receiving the uplink transmission resource from each cell group , it is possible to implement the 1-1 allocation method, the 1-2 allocation method, and the second allocation method for performing data pre-processing in the dual access environment. That is, instead of not performing pre-processing in operation 1130, data allocated to each cell group is pre-processed according to the 1-1 allocation method, or data allocated to each cell group is pre-processed according to the 1-2 allocation method. Alternatively, data allocated to each cell group may be pre-processed according to the second method, and operations 1135 or less may be applied to data that is not pre-processed.

12 is a diagram illustrating the operation of a terminal according to a second embodiment of implementing the terminal data pre-processing operation in multiple access according to an embodiment of the present invention.

In FIG. 12 , when the UE receives an IP packet from the PDCP layer device, it may configure it as a PDCP PDU and store it in a first buffer ( 1205 ).

The terminal compares the amount of the stored data with a threshold value ( 1210 ). The timing of comparing with the threshold value and the method of calculating the amount of data to be compared with the threshold value may follow the above description of the present invention. If the amount of stored data is less than the threshold value, operation 1215 is performed. If the amount of stored data is greater than or equal to the threshold value, operation 1230 is performed.

When the amount of data of the PDCP layer is less than a set threshold value, the UE does not pre-allocate the data of the PDCP layer to the master cell group and the secondary cell group. The UE performs data pre-processing of data within the threshold value only in the master cell group (or in the secondary cell group or in a pre-designated cell group). The terminal may store the pre-processed data in the second buffer ( 1215 ).

The UE receives a UL grant for the corresponding cell group (1220). The UE may transmit pre-processed data to the corresponding cell group using the received UL grant (1225).

That is, when the amount of data of the PDCP layer is smaller than the set threshold value, the operation may be performed in the same manner as in the first embodiment, and the use of an integrated buffer instead of an independent buffer may be different.

When the amount of data in the PDCP layer is greater than the threshold value, data may be pre-processed in each cell group, and a virtual RLC serial number may be allocated and stored in the second buffer ( 1230 ). For example, the total data of the current PDCP layer may be allocated in advance to the master cell group and the secondary cell group according to a predetermined split ratio set by the network or the base station (or the master cell group for data as much as a threshold value) Data pre-processing may be performed with a cell group, and data pre-processing may be performed after allocating data above a threshold to a master cell group and a secondary cell group according to a predetermined split ratio, or for all data, each cell Data pre-processing may be performed as much as the maximum receivable UL grant amount for the group) (1230).

For the data previously decided to be transmitted to each cell group in the same way as described above, the terminal may perform data pre-processing for each cell group before the uplink transmission resource is allocated to each cell group. That is, it is possible to allocate an RLC serial number, configure an RLC header and a MAC header in advance, and store pre-processed data for each cell group in the second buffer. In the above, the RLC serial number may be a virtual RLC serial number. That is, it may be an RLC serial number temporarily designated according to a ratio set by the network or by the maximum UL grant amount of each cell group.

The UE may receive a UL grant for each cell group (1235). When the UE receives an uplink transmission resource (UL grant) for each cell group, an RLC serial number may be reallocated according to the received uplink transmission resource (1240). If the pre-allocated virtual RLC serial number matches well with the actually allocated uplink transmission resource, there is no need to re-allocate the RLC serial number.

As described above, if uplink transmission resources are actually performed from each cell group after data pre-processing is performed on each cell group, the terminal compares the actually received uplink transmission resource with the amount of data pre-processed data, and then transmits the received uplink transmission resource. A virtual RLC serial number may be reallocated so that data may be sequentially transmitted to the resource ( 1240 ).

The RLC serial number may be reallocated for some of the data pre-processed data, and data may be transmitted according to the size of each uplink transmission resource ( 1245 ). If necessary, when the size of the transmission resource does not match the size of the pre-processed data, the division operation may be performed.

In the above, the UL grant for each cell group may arrive at different times. Therefore, in order to transmit data first for a cell group corresponding to the UL grant that arrives earlier, the RLC serial number may be reassigned. That is, the RLC serial number may be reassigned and recorded in the mapping table in order to transmit data that has been pre-processed for the master cell group to the secondary cell group to which the UL grant has arrived first (cell group indicator (link) change, RLC serial number update).

After the data pre-processed data is transmitted to each cell group, virtual RLC serial numbers may be reassigned to the remaining data pre-processed data. The virtual RLC serial numbers mean that RLC serial numbers are allocated again for the next UL grant (1250).

In the embodiment of FIG. 12, the operation of the terminal has been mainly described by taking the second allocation method as an example, but the embodiment of FIG. 12 also includes the first allocation method, the 1-1 allocation method, and the 1-2 allocation method. applicable. The second embodiment uses an integrated buffer, allocates a virtual RLC serial number to preprocessed data, and updates or reallocates the RLC serial number after receiving uplink transmission resources. A method for determining data for preprocessing All of the first allocation method, the 1-1 allocation method, the 1-2 allocation method, and the second allocation method of the present invention are applicable.

13 is a diagram illustrating the operation of a terminal according to a third embodiment of implementing the terminal data pre-processing operation in multiple access according to an embodiment of the present invention.

In FIG. 13 , a third embodiment for implementing the terminal data preprocessing operation in dual access may be characterized in that it does not have a separate buffer for each cell group, but has one integrated buffer and has an integrated mapping table.

Upon receiving the IP packet from the PDCP layer device, the UE may configure it as a PDCP PDU and store it in the first buffer (1305).

The terminal compares the amount of stored data with a threshold value (1310). The timing of comparing with the threshold value and the method of calculating the amount of data to be compared with the threshold value may follow the above description of the present invention. If the amount of stored data is less than the threshold value, operation 1315 may be performed, and if the amount of stored data is greater than or equal to the threshold value, operation 1330 may proceed.

When the amount of data of the PDCP layer is less than a set threshold value, the UE does not pre-allocate the data of the PDCP layer to the master cell group and the secondary cell group. In addition, data pre-processing is performed only on the data within the threshold value in the master cell group (or in the secondary cell group or in a pre-designated cell group). The terminal may store the pre-processed data in the second buffer (1315).

The UE receives a UL grant for the corresponding cell group (1320). The UE may transmit pre-processed data to the corresponding cell group using the received UL grant (1325).

That is, when the amount of data of the PDCP layer is smaller than the set threshold value, the operation may be performed in the same manner as in the first embodiment, and the use of an integrated buffer instead of an independent buffer may be different.

A third embodiment proposes a data partial pre-processing method. The data part pre-processing method performs all the same procedures as for data pre-processing, but does not allocate an RLC serial number, leaves a space to which an RLC serial number is to be allocated, and does not process (in memory means to leave an empty seat). And the remaining RLC header field and MAC header mean that data is pre-processed. Since the RLC serial number is not reassigned multiple times as in the second embodiment, it is possible to reduce the processing power of the terminal and reduce the burden. Then, the memory address of each RLC serial number is stored, and whenever an uplink transmission resource is received from each cell group, the RLC serial number is allocated using the stored RLC serial number memory address by the size of the data to be transmitted corresponding thereto. do. Accordingly, in the third embodiment, the data partial pre-processing may be performed at the same time points or under the described conditions when the data pre-processing process described above is performed. In addition, whenever an uplink transmission resource is received from each cell group, an RLC serial number may be allocated and data transmission may be performed.

Even when the amount of data of the PDCP layer is smaller than a set threshold value, the data partial pre-processing method described above may be applied.

When the amount of data in the PDCP layer exceeds the threshold value, data may be pre-processed in each cell group. However, since partial pre-processing is performed, the RLC serial number may not be assigned ( 1330 ). For example, with respect to all data of the current PDCP layer, data partial pre-processing may be performed by the sum of the maximum receivable UL grant amount for each cell group ( 1330 ). That is, the UE may preconfigure the RLC header and the MAC header without allocating an RLC serial number, and store preprocessed data for the data part for each cell group in the second buffer. Therefore, when an uplink transmission resource (UL grant) is actually received for each cell group, an RLC serial number may be allocated according to the received uplink transmission resource.

The UE may receive a UL grant for each cell group (1335). When an uplink transmission resource is actually received from each cell group after performing the data partial preprocessing as described above, the terminal compares the actually received uplink transmission resource with the amount of data partial preprocessed data, and adds the received uplink transmission resource to the received uplink transmission resource. An RLC serial number may be allocated so that data may be sequentially transmitted ( 1340 ).

The UE may allocate an RLC serial number to some of the data part pre-processed data and transmit data according to the size of each uplink transmission resource ( 1345 ). If necessary, when the size of the transmission resource does not match the size of the pre-processed data, the division operation may be performed.

In the above, after the data part preprocessed data is transmitted to each cell group, an RLC serial number is assigned and data transmission is performed after receiving the next UL grant from each cell group for the remaining data part preprocessed data. The above procedure may be repeated.

In the above, the UL grant for each cell group may arrive at different times. Therefore, in order to first transmit data to a cell group corresponding to the UL grant that arrives earlier, an RLC serial number may be allocated first and data transmission may be performed.

The dual access technology described in the present invention can be extended and applied to a multiple access environment connected to three or four base stations.

Also, as a fourth embodiment of the present invention, the terminal applies the data part pre-processing method by applying the third embodiment, and if a predetermined split ratio designated by the network in advance and the ratio of the UL grant allocated by each cell group When it is determined that this match is good, that is, when the match is performed well more than a predetermined number of times or when the match is performed well for a predetermined period, the terminal may apply the second embodiment. In addition, if it is determined that the matching is not successful, the third embodiment may be performed again. That is, the above embodiments can be used in combination.

In the third embodiment of the present invention, the data part pre-processing method can be extended to not only do not allocate RLC serial numbers but also not allocate PDCP serial numbers. That is, the digit of the PDCP serial number (by leaving the memory space empty) may be left blank, not allocated, and may be allocated later. After a predetermined time has elapsed, for example, when a predetermined timer expires, or every predetermined period, a PDCP serial number may be assigned to the currently existing IP packet data. Alternatively, when performing the data partial preprocessing method, the PDCP serial number and RLC serial number are not assigned, and the PDCP header, RLC header, and MAC subheader are data preprocessed. Data can be transmitted by allocating a PDCP serial number and an RLC serial number according to the link transmission resource size. In this case, it is necessary to add a field for the memory address of the PDCP serial number in the mapping table information.

In the above embodiments, a field indicating whether a PDCP serial number or an RLC serial number is allocated or not may be required in the mapping table.

In addition, in the third embodiment, not allocating RLC serial numbers means that RLC serial numbers may not be allocated to all pre-processed data, and RLC serial numbers may not be allocated to some of the pre-processed data. . For example, a serial number may be allocated to the first RLC PDU, and a serial number may not be allocated to subsequent RLC PDUs. In addition, in anticipation of uplink resource allocation, RLC serial numbers may be allocated only to some pre-processed RLC PDUs, and serial numbers may not be allocated to the remaining pre-processed RLC PDUs.

The data pre-processing implementation methods in dual access of the present invention are methods that can be usefully applied in an uplink split bearer of a terminal as a method for accelerating data processing, and also a downlink split bearer of a base station ( Downlink split bearer) can also be usefully applied.

13 is a view showing modified implementation methods of the first, second, and third embodiments of the present invention.

14 shows modified implementation methods of the first, second, and third embodiments of the present invention. In FIGS. 8, 9, and 10, data on which data pre-processing technology has been performed is managed in the mapping table in units including headers and data. In addition, it is assumed as an example that RLC serial numbers or PDCP serial numbers are sequentially located on the memory or buffer in the order. The implementation methods described with reference to FIGS. 8 to 10 in the present invention are an example, and a most efficient method is presented. Other modified methods are possible.

When implemented by another implementation method, as shown in FIG. 14 , it can be stored and managed separately for each transport header (MAC header, RLC header, PDCP header) and for each data ( 1420 ). In this case, in the mapping table, a field indicating an address of each header and a field indicating data may be configured, respectively, and mapping information for each header and data may be recorded. Also, as in 1425, headers and data of each layer can be individually stored and managed. In the above, fields indicating addresses of individual headers in the mapping table and mapping information for them may be added and managed.

14, the method proposed in the present invention can be implemented in various ways. In addition, data pre-processing technology conceptually processes data in advance as in 1415, how to store and manage it, use physically different buffers, logically classify buffers, manage multiple mapping tables independently, etc. , it can be implemented differently by separating and managing headers and data.

When header and data are individually managed as described above, the header and data can be concatenated and delivered to the lower layer by referring to the corresponding memory address when constructing the MAC PDU.

Since the embodiment described with reference to FIG. 14 manages the pre-processed data in the mapping table, the first allocation method, the 1-1 allocation method, the 1-2 allocation method, and the second allocation method of the present invention The same can be applied when managing the mapping table by preprocessing the data assigned to each cell group accordingly. That is, in each of the embodiments of FIGS. 8, 9, and 10 , each transport header (MAC header, RLC header, PDCP header) and data may be classified and stored in the mapping table and managed. In addition, when implementing the first, second, third and fourth embodiments of the present invention, the first allocation method, the 1-1 allocation method, and the 1-2 According to the allocation method and the second allocation method, the data allocated to each cell group is pre-processed data, and the pre-processed data is classified by each transport header (MAC header, RLC header, PDCP header) and data and stored in the mapping table. can be stored and managed.

In the second embodiment of the present invention, if a segment of an RLC SDU is transmitted to a certain cell group (master cell group or secondary cell group), the remaining segment of the one RLC SDU must also be transmitted to the cell group (the cell group). It will have the same RLC serial number as the segment transmitted earlier in the group, and is separated by the SI field so that the receiving end can perform reassembly).

In addition, in the second embodiment of the present invention, the secondary cell group for a predetermined reason (for example, when uplink transmission resources are first allocated to the secondary cell group) for data that has been pre-processed for data transmission to the master cell group in the second embodiment of the present invention. , the RLC serial number of the RLC header is updated to match the secondary cell group, and the LCID (logical channel identifier) of the MAC subheader is updated to match the logical channel identifier of the RLC layer device corresponding to the secondary cell group. Thereafter, the MAC layer device corresponding to the secondary cell group may perform transmission processing (multiplexing or MAC header generation or, if necessary, requesting a split operation to the RLC layer). Conversely, if it is decided to transmit data that has undergone data pre-processing for transmission to the secondary cell group to the master cell group for a predetermined reason (eg, when uplink transmission resources are first allocated to the master cell group), the RLC header After updating the RLC serial number of the MAC subheader to match the master cell group, and updating the LCID (logical channel identifier) of the MAC subheader to match the logical channel identifier of the RLC layer device corresponding to the master cell group, the MAC corresponding to the master cell group The layer device may perform a process for transmission (multiplexing or MAC header generation, or requesting a split operation to the RLC layer if necessary).

In the third embodiment of the present invention, if a segment of an RLC SDU is transmitted to a certain cell group (master cell group or secondary cell group), the remaining segment of the one RLC SDU must also be transmitted to the cell group (the cell group). It will have the same RLC serial number as the segment transmitted earlier in the group, and is separated by the SI field so that the receiving end can perform reassembly).

In addition, if it is decided to transmit data on which data pre-processing has been performed in the third embodiment of the present invention to the secondary cell group for a predetermined reason (eg, when uplink transmission resources are first allocated to the secondary cell group), After setting the RLC serial number of the RLC header to match the secondary cell group, and updating the LCID (logical channel identifier) of the MAC subheader to match the logical channel identifier of the RLC layer device corresponding to the secondary cell group, the secondary cell group The MAC layer device may perform transmission processing (multiplexing or MAC header generation or, if necessary, requesting a split operation to the RLC layer). Conversely, if it is decided to transmit data on which data pre-processing has been performed to the master cell group for a predetermined reason (eg, when uplink transmission resources are first allocated to the master cell group), the RLC serial number of the RLC header is set to the master cell. After updating according to the group and updating the LCID (logical channel identifier) of the MAC subheader to match the logical channel identifier of the RLC layer device corresponding to the master cell group, the MAC layer device corresponding to the master cell group processes for transmission (multiplexing or MAC header generation or, if necessary, requesting a split operation to the RLC layer) can be performed.

The procedure for performing data pre-processing in a single access or dual access environment of the present invention can be applied as follows. In addition, the data pre-processing method applied below may be applied to the first, second, and third embodiments proposed in the present invention.

1. First embodiment of data pre-processing: Each PDCP layer ciphers a PDCP SDU (IP packet or data packet) and, if necessary, performs integrity protection, generates a PDCP header, and each RLC layer Data preprocessing can be completed by allocating an RLC serial number, setting the SI (Segmentation Information) field, and configuring the RLC header. If the MAC layer satisfies a predetermined condition and instructs each RLC layer device, the L (Length) field according to the size of the RLC PDU so that the MAC layer processes the RLC PDU data pre-processed by each RLC layer device , configures a logical channel identifier (LCID) suitable for each RLC layer device, configures a MAC header, configures each MAC subheader and MAC SDU, and multiplexes the MAC PDU to fit the size of the uplink transmission resource. can do. The predetermined condition of the MAC layer may be when the uplink transmission resource is received from the base station, and when the uplink transmission resource is received, each RLC layer may be instructed to transmit data preprocessed RLC PDUs to the MAC layer device.

2. Second embodiment of data preprocessing: In the second embodiment of data preprocessing, each PDCP header and each RLC header can be separately created, stored, and managed when the first embodiment of the data preprocessing is performed. That is, when performing data pre-processing, each PDCP header and each RLC header may be previously generated, processed, and stored. If, after receiving uplink transmission resources, a split operation is to be performed due to lack of transmission resources, the SI field of the generated RLC header is updated (01 for the first segment, 10 for the last segment, the first segment and the last If it is not all segments, set to 11) If necessary, the SO field can be dynamically added to the RLC header (if it is not the first segment, add a 2-byte segment offset (SO) field and indicate the offset).

3. Third embodiment of data pre-processing: In the third embodiment of data pre-processing, the first embodiment of data pre-processing is performed, but before uplink transmission resources are received (allocated), data processing of the MAC layer device is performed in advance. can be done In this case, each PDCP header, each RLC header, and each MAC header may be separately generated, stored, and managed. That is, when performing data pre-processing, each PDCP header, each RLC header, and each MAC header may be generated, processed, and stored in advance. If, after receiving uplink transmission resources, a split operation is to be performed due to lack of transmission resources, the SI field of the generated RLC header is updated (01 for the first segment, 10 for the last segment, the first segment and the last If it is not all segments, set to 11) If necessary, the SO field can be dynamically added to the RLC header (if it is not the first segment, add a 2-byte segment offset (SO) field and indicate the offset).

The first calculation method, the second calculation method, the third calculation method, and the fourth calculation method for comparing the data amount of the PDCP layer and the threshold value proposed above are the first, second, and third calculation methods. All examples are applicable.

In the data preprocessing procedure of single connection and data preprocessing of dual connection of the present invention, when the PDCP discard timer for each PDCP SDU (or PDCP PDU) expires in the PDCP layer, the PDCP SDU (or PDCP PDU) ) may be sent to the RLC layer to discard. Upon receiving the indication, the operation of the RLC layer device may perform one of the proposed following procedures.

1. First embodiment: When the RLC layer device receives an instruction to discard a certain PDCP PDU from the PDCP layer device, if it has not already assigned an RLC serial number to the PDCP PDU, it is immediately discarded. If an RLC serial number has already been assigned, it is not discarded.

2. Second embodiment: When the RLC layer device receives an instruction to discard a certain PDCP PDU from the PDCP layer device, if it has not already assigned an RLC serial number to the PDCP PDU, it is immediately discarded. If the RLC serial number has already been allocated and some segments of the PDCP PDU have been delivered or transmitted to the lower layer, it is not discarded. If the RLC serial number has already been allocated and some segments of the PDCP PDU have not been delivered to the lower layer or have not been transmitted, they are immediately discarded. If the RLC PDU to which the RLC serial number is assigned is discarded, an RLC serial number gap occurs at the receiving end to request retransmission, and since the transmitting end has never transmitted (discarded), retransmission cannot be performed. As a result, transmission delay or disconnection may occur. Therefore, in order to solve this problem, if the RLC layer device discards the RLC PDU to which the RLC serial number is assigned, the RLC serial number allocated to the discarded RLC PDU is reallocated for a new PDCP PDU received from the upper layer, and transmitted Thus, it is possible to prevent an RLC serial number gap from occurring at the receiving end. As another method, when allocating the RLC PDU to which the RLC serial number is assigned, only the RLC SDU, which is the data part, is discarded and only the RLC header and the PDCP header are transmitted so that the RLC serial number gap does not occur at the receiving end.

When applying the first, second, and third embodiments in the dual access environment of the present invention, if the base station sets the threshold value to infinity with an RRC message (RRC Connection Reconfiguration), the master cell group or the secondary cell In the case of indicating including an indicator indicating a group, data may be transmitted only through the master cell group or the secondary cell group. In addition, the RRC message may instruct to perform data transmission only to the master cell group or to perform data transmission only to the secondary cell group. That is, the data transmission path may be dynamically switched (path switching). If the base station instructs with an RRC message to perform transmission only in one cell group when the terminal is transmitting data through dual access to the master cell group and the secondary cell group, the terminal performs data pre-processing in the other cell group Cancels (emptys) all of the data, and performs data pre-processing again on PDCP PDUs (PDCP PDUs that have been data pre-processed to the other cell group) to the cell group indicated by the base station for data transmission, and prepares for transmission can do. When transmission is stopped for the master cell group or the secondary cell group, transmission delay occurs for data pre-processed and data may be lost.

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

Referring to FIG. 15 , the terminal includes a radio frequency (RF) processing unit 1510 , a baseband processing unit 1520 , a storage unit 1530 , and a control unit 1540 .

The RF processing unit 1510 performs a function for transmitting and receiving a signal through a wireless channel, such as band conversion and amplification of the signal. That is, the RF processor 1510 up-converts the baseband signal provided from the baseband processor 1520 into an RF band signal, transmits it through an antenna, and converts the RF band signal received through the antenna to a baseband signal. down-convert to For example, the RF processing unit 1510 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital to analog converter (DAC), an analog to digital converter (ADC), etc. . In the drawing, only one antenna is shown, but the terminal may include a plurality of antennas. Also, the RF processing unit 1510 may include a plurality of RF chains. Furthermore, the RF processing unit 1510 may perform beamforming. For the beamforming, the RF processing unit 1510 may adjust the phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements. Also, the RF processing unit may perform MIMO, and may receive multiple layers when performing MIMO operation. The RF processor 1510 may perform receive beam sweeping by appropriately setting a plurality of antennas or antenna elements under the control of the controller, or may adjust the direction and beam width of the receive beam so that the receive beam is coordinated with the transmit beam.

The baseband processing unit 1520 performs a function of converting between a baseband signal and a bit stream according to a physical layer standard of a system. For example, when transmitting data, the baseband processing unit 1520 generates complex symbols by encoding and modulating a transmitted bit stream. Also, when receiving data, the baseband processing unit 1520 restores a received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 1510 . For example, when transmitting data according to an orthogonal frequency division multiplexing (OFDM) scheme, the baseband processing unit 1520 generates complex symbols by encoding and modulating a transmission bit stream, and mapping the complex symbols to subcarriers After that, OFDM symbols are constructed through inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion. Also, upon data reception, the baseband processing unit 1520 divides the baseband signal provided from the RF processing unit 1510 into OFDM symbol units, and performs a fast Fourier transform (FFT) operation on the signals mapped to subcarriers. After restoration, the received bit stream is restored through demodulation and decoding.

The baseband processing unit 1520 and the RF processing unit 1510 transmit and receive signals as described above. Accordingly, the baseband processing unit 1520 and the RF processing unit 1510 may be referred to as a transmitter, a receiver, a transceiver, or a communication unit. Furthermore, at least one of the baseband processing unit 1520 and the RF processing unit 1510 may include a plurality of communication modules to support a plurality of different wireless access technologies. In addition, at least one of the baseband processor 1520 and the RF processor 1510 may include different communication modules to process signals of different frequency bands. For example, the different radio access technologies may include an LTE network, an NR network, and the like. In addition, the different frequency bands may include a super high frequency (SHF) (eg, 2.5 GHz, 5 GHz) band and a millimeter wave (eg, 60 GHz) band.

The storage unit 1530 stores data such as a basic program, an application program, and setting information for the operation of the terminal. The storage unit 1530 provides stored data according to the request of the control unit 1540 .

The controller 1540 controls overall operations of the terminal. For example, the control unit 1540 transmits and receives signals through the baseband processing unit 1520 and the RF processing unit 1510 . In addition, the control unit 1540 writes and reads data in the storage unit 1540 . To this end, the controller 1540 may include at least one processor. For example, the controller 1540 may include a communication processor (CP) that controls for communication and an application processor (AP) that controls an upper layer such as an application program.

According to an embodiment of the present invention, the controller 1540 acquires data, determines a cell group to pre-process the data based on the amount of data and a threshold value, and uplink transmission resources for transmitting the data. pre-process the data in the determined cell group before receiving can be controlled

In this case, the pre-processing may include processing the acquired data in measurement of at least one of a packet data convergence protocol (PDCP) or lower layer before receiving the uplink transmission resource. The pre-processing may include generating an RLC PDU based on the obtained data in the RLC layer of the terminal.

Also, the controller 1540 may determine a link through which the generated RLC PDU is to be transmitted based on the uplink transmission resource, and may allocate the RLC serial number to each determined link.

In addition, the control unit 1540 allocates a virtual RLC serial number during the pre-processing, and when the uplink transmission resource is received, reallocates the RLC serial number based on the size of the uplink transmission resource can do.

In addition, when the amount of data is less than a threshold value, the controller 1540 controls to pre-process the data in a preset cell group, and when the amount of data is greater than a threshold value,

The amount of data corresponding to the threshold may be pre-processed in a preset cell group, and the remaining data may be processed after receiving the uplink transmission resource.

In addition, when the amount of data is greater than a threshold value, the controller 1540 pre-processes the data according to a preset ratio or a preset amount for a master cell group and a secondary cell group. and the remaining data may be processed after receiving the uplink transmission resource.

Also, the controller 1540 may store the pre-processed data by separating the header of each layer and data of each layer in the mapping table.

The configuration and operation of the control unit 1540 are not limited to the above-described configuration, and the operation of the terminal described through each embodiment of the present invention may be performed or controlled by the control unit 1540 .

16 shows a block configuration of a transmission and reception point (TRP) in a wireless communication system according to an embodiment of the present invention. TRP may be referred to as a base station.

Referring to FIG. 16 , the base station may include an RF processing unit 1610 , a baseband processing unit 1620 , a communication unit 1630 , a storage unit 1640 , and a control unit 1650 .

The RF processing unit 1610 performs a function for transmitting and receiving a signal through a wireless channel, such as band conversion and amplification of the signal. That is, the RF processor 1610 up-converts the baseband signal provided from the baseband processor 1620 into an RF band signal, transmits it through an antenna, and converts the RF band signal received through the antenna to a baseband signal. downconverted to For example, the RF processing unit 1610 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like. Although only one antenna is shown in the drawing, the first access node may include a plurality of antennas. Also, the RF processing unit 1610 may include a plurality of RF chains. Furthermore, the RF processing unit 1610 may perform beamforming. For the beamforming, the RF processing unit 1610 may adjust the phase and magnitude of each of signals transmitted and received through a plurality of antennas or antenna elements. The RF processing unit may perform a downlink MIMO operation by transmitting one or more layers.

The baseband processing unit 1620 performs a function of converting between a baseband signal and a bit stream according to the physical layer standard of the first radio access technology. For example, when transmitting data, the baseband processing unit 1620 generates complex symbols by encoding and modulating a transmitted bit stream. Also, when receiving data, the baseband processing unit 1620 restores a received bit stream by demodulating and decoding the baseband signal provided from the RF processing unit 1610 . For example, in the OFDM scheme, when transmitting data, the baseband processing unit 1620 generates complex symbols by encoding and modulating a transmitted bit stream, maps the complex symbols to subcarriers, and performs IFFT operation and OFDM symbols are configured through CP insertion. Also, upon data reception, the baseband processing unit 1620 divides the baseband signal provided from the RF processing unit 1610 into OFDM symbol units, restores signals mapped to subcarriers through an FFT operation, and demodulates them. and recovers the received bit stream through decoding. The baseband processing unit 1620 and the RF processing unit 1610 transmit and receive signals as described above. Accordingly, the baseband processing unit 1620 and the RF processing unit 1610 may be referred to as a transmitter, a receiver, a transceiver, a communication unit, or a wireless communication unit.

The communication unit 1630 provides an interface for performing communication with other nodes in the network. The communication unit 1630 may be referred to as a backhaul communication unit.

The storage unit 1640 stores data such as a basic program, an application program, and setting information for the operation of the main station. In particular, the storage unit 1640 may store information on a bearer assigned to an accessed terminal, a measurement result reported from the accessed terminal, and the like. In addition, the storage unit 1640 may store information serving as a criterion for determining whether to provide or stop multiple connections to the terminal. In addition, the storage unit 1640 provides stored data according to the request of the control unit 1650 .

The controller 1650 controls overall operations of the main station. For example, the control unit 1650 transmits and receives signals through the baseband processing unit 1620 and the RF processing unit 1610 or through the backhaul communication unit 1630 . In addition, the control unit 1650 writes and reads data in the storage unit 1640 . To this end, the controller 1650 may include at least one processor.

In addition, the controller 1650 may control the operation of the base station according to each embodiment of the present invention. For example, the controller 1650 may control an operation of allocating an uplink resource to the terminal, an operation of receiving uplink data from the terminal, and the like.

In addition, the embodiments disclosed in the present specification and drawings are merely provided for specific examples to easily explain and help understanding of the contents of the present invention, and are not intended to limit the scope of the present invention. Therefore, the scope of the present invention should be construed as including all changes or modifications derived based on the technical idea of the present invention in addition to the embodiments disclosed herein are included in the scope of the present invention.

Claims (20)

In the data processing method of a terminal in which dual access is established,
acquiring data;
determining a cell group for pre-processing the data based on the amount of data and a threshold value;
pre-processing the data in the determined cell group before receiving an uplink transmission resource for transmitting the data;
identifying whether the uplink transmission resource has been received; and
When the uplink transmission resource is received, determining a radio link control (RLC) serial number of the pre-processed data based on the uplink transmission resource,
pre-processing the data includes generating an RLC header,
After receiving the uplink transmission resource, if it is determined that segmentation is required according to a resource shortage, a segment information (SI) field of the generated RLC header is updated. According to claim 1, wherein the line processing,
and processing the obtained data in instrumentation of at least one of a packet data convergence protocol (PDCP) sub-layer before receiving the uplink transmission resource. According to claim 1, wherein the line processing,
A method characterized in that the RLC layer of the terminal generates an RLC protocol data unit (PDU) based on the obtained data. 4. The method of claim 3,
When generating the RLC PDU in the pre-processing process, the RLC serial number is not assigned,
When the uplink transmission resource is received, the RLC serial number is allocated based on the size of the uplink transmission resource. The method of claim 3, wherein a link through which the generated RLC PDU is transmitted is determined based on the uplink transmission resource, and the RLC serial number is assigned to each determined link. 4. The method of claim 3,
Allocating a virtual RLC serial number when processing the line,
When the uplink transmission resource is received, the RLC serial number is reallocated based on the size of the uplink transmission resource. The method of claim 1,
If the amount of the data is less than a threshold value, the method characterized in that the pre-processing of the data in a preset cell group. The method of claim 1, wherein if the amount of data is greater than a threshold,
The amount of data corresponding to the threshold is pre-processed in a preset cell group,
The remaining data is processed after receiving the uplink transmission resource. The method of claim 1, wherein if the amount of data is greater than a threshold,
Pre-processing the data according to a preset ratio or preset amount in a master cell group and a secondary cell group,
The remaining data is processed after receiving the uplink transmission resource. The method of claim 1, wherein the pre-processed data is stored separately from a header of each layer and data of each layer in a mapping table. In a terminal in which dual access is established,
a transceiver for transmitting and receiving a signal; and
Acquire data, determine a cell group to pre-process the data based on the amount of data and a threshold value, and pre-process the data in the determined cell group before receiving an uplink transmission resource for transmitting the data control to determine whether the uplink transmission resource has been received, and if the uplink transmission resource is received, determine a radio link control (RLC) serial number of the pre-processed data based on the uplink transmission resource Ha ha includes a control unit,
pre-processing the data includes generating an RLC header,
After receiving the uplink transmission resource, if it is determined that division is required according to a resource shortage, the SI (segment information) field of the generated RLC header is updated. The method of claim 11, wherein the line processing comprises:
and processing the acquired data in measurement of at least one of a packet data convergence protocol (PDCP) sub-layer before receiving the uplink transmission resource. The method of claim 11, wherein the line processing comprises:
A terminal, characterized in that for generating an RLC protocol data unit (PDU) based on the obtained data in the RLC layer of the terminal. The method of claim 13, wherein the control unit,
When generating the RLC PDU in the pre-processing process, the RLC serial number is not assigned,
When the uplink transmission resource is received, the terminal characterized in that it allocates the RLC serial number based on the size of the uplink transmission resource. The method of claim 13, wherein the control unit,
A terminal for determining a link through which the generated RLC PDU is to be transmitted based on the uplink transmission resource and allocating the RLC serial number to each determined link. The method of claim 13, wherein the control unit,
Allocating a virtual RLC serial number when processing the line,
When the uplink transmission resource is received, the terminal characterized in that it reallocates the RLC serial number based on the size of the uplink transmission resource. The method of claim 11, wherein the control unit,
When the amount of data is less than a threshold value, the terminal characterized in that the pre-processing of the data in a preset cell group. The method of claim 11, wherein the control unit,
If the amount of data is greater than the threshold,
The amount of data corresponding to the threshold is pre-processed in a preset cell group,
The remaining data is processed after receiving the uplink transmission resource. The method of claim 11, wherein the control unit,
If the amount of data is greater than the threshold,
Pre-processing the data according to a preset ratio or preset amount in a master cell group and a secondary cell group,
The remaining data is processed after receiving the uplink transmission resource. The method of claim 11, wherein the control unit,
The terminal, characterized in that the pre-processed data is stored separately from the header of each layer and the data of each layer in a mapping table.

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