KR102265514B1 - Method and apparatus for transmitting and receiving data in wireless communication sytem - Google Patents

Abstract

In order to solve the data deadlock of the user equipment, it is determined whether the state of receiving data transmitted from the base station of the wireless communication system is the deadlock state, the RRC connection with the base station is established, and the TA of the user equipment is performed through the MME of the EPC. and reconfigures the RRC connection with the base station.

Description

Method and apparatus for transmitting and receiving data in a wireless communication system {METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA IN WIRELESS COMMUNICATION SYTEM}

The following embodiments relate to a technology for transmitting and receiving data of a wireless communication system, and more particularly, to a technology for transmitting and receiving data of a wireless communication system of a non-standalone (NSA) network.

As 5G (generation) non-standalone (NSA) networks are newly introduced, interworking and control functions between NR (new radio) base stations supporting new wireless communication technologies and existing LTE base stations are essential. In the case of the NSA Option 3 structure connected to an Evolved Packet Core (EPC), bearer split transmission is possible in an NR base station where large data transmission is advantageous.

An embodiment may provide a method and apparatus for a user terminal to receive data.

An embodiment may provide a method and apparatus for a wireless communication system to transmit data.

According to an aspect, a method for receiving data, performed by a user device, includes: determining whether a state of receiving data transmitted from a base station of a wireless communication system is a deadlock state; , establishing a Radio Resource Control (RRC) connection with the base station, when the connection is established, a tracking area (TA) of the user equipment through a Mobility Management Entity (MME) of an Evolved Packet Core (EPC) of the wireless communication system ), and when the TA is updated, reconfiguring an RRC connection with the base station, wherein the user equipment receives the data through the reconfigured RRC connection.

The data may include Packet Data Convergence Protocol (PDCP) packets having a plurality of serial numbers.

Determining whether the state of receiving the data is a deadlock state includes determining whether at least one packet of the data valid for a preset time is received, and receiving the data if a valid packet is not received and determining that the condition to be executed is a deadlock state.

The step of determining whether at least one packet of the data valid for the preset time is received may include: a target serial number of a received target packet is a reference serial number of at least one previously received packet determining whether the target serial number corresponds to the number, and determining the target packet as a valid packet if the target serial number does not correspond to the reference serial number.

The step of establishing an RRC connection with the base station includes: transmitting an RRC connection re-establishment request to the base station; receiving a message refusing the RRC connection re-establishment from the base station; and transmitting an RRC connection request to the base station and establishing the RRC connection with the base station.

When the RRC connection re-establishment is rejected, a resource corresponding to a Cell-Radio Network Temporary Identifier (C-RNTI) allocated to the user equipment may be released from the base station.

The updating of the TA of the user equipment may include transmitting the TA update request to the MME, and receiving a TA update approval from the MME.

The step of reconfiguring the RRC connection with the base station may include receiving an RRC connection reconfiguration from the base station, and transmitting completion of the RRC connection reconfiguration to the base station.

According to another aspect, a user device includes a memory in which a program for receiving data is recorded, and a processor for executing the program, wherein the program is deadlocked in a state of receiving data transmitted from a base station of a wireless communication system. Determining whether or not the data reception state is a deadlock state, establishing a Radio Resource Control (RRC) connection with the base station, when the connection is established, an Evolved Packet Core (EPC) of the wireless communication system ) updating a tracking area (TA) of the user equipment through a Mobility Management Entity (MME) of the user equipment, and when the TA is updated, reconfiguring an RRC connection with the base station, the user equipment is the The data is received through the reconfigured RRC connection.

The data may include Packet Data Convergence Protocol (PDCP) packets having a plurality of serial numbers.

The step of establishing an RRC connection with the base station may include: transmitting an RRC connection re-establishment request to the base station; receiving a message rejecting the RRC connection re-establishment from the base station; and transmitting an RRC connection request to the base station and establishing the RRC connection with the base station.

When the RRC connection re-establishment is rejected, a resource corresponding to a Cell-Radio Network Temporary Identifier (C-RNTI) allocated to the user terminal may be released from the base station.

The updating of the TA of the user equipment may include transmitting the TA update request to the MME, and receiving a TA update approval from the MME.

The step of reconfiguring the RRC connection with the base station may include receiving an RRC connection reconfiguration from the base station, and transmitting completion of the RRC connection reconfiguration to the base station.

According to another aspect, a method for transmitting data, performed by a wireless communication system, including a base station and an Evolved Packet Core (EPC), includes, when a data reception state of a user equipment is a deadlock state, the base station is the user Establishing a Radio Resource Control (RRC) connection with a device, when the connection is established, updating a tracking area (TA) of the user device through a Mobility Management Entity (MME) of the EPC, and the TA is updated when the RRC connection is established, reconfiguring an RRC connection between the base station and the user equipment, and transmitting the data to the user equipment through the reconfigured RRC connection.

The data may include Packet Data Convergence Protocol (PDCP) packets having a plurality of serial numbers.

The establishing of the RRC connection includes: receiving an RRC connection re-establishment request from the user equipment; transmitting a message rejecting the RRC connection re-establishment to the user equipment; and receiving an RRC connection request from the user equipment and establishing the RRC connection.

When the RRC connection re-establishment is rejected, a resource corresponding to a Cell-Radio Network Temporary Identifier (C-RNTI) allocated to the user terminal may be released from the base station.

According to another aspect, a base station of a wireless communication system includes a memory in which a program for transmitting data is recorded, and a processor for executing the program, wherein the program is configured such that the data reception state of the user equipment is a deadlock state. case, establishing a Radio Resource Control (RRC) connection between the base station and the user equipment, and a tracking area (TA) of the user equipment through a Mobility Management Entity (MME) of an Evolved Packet Core (EPC) of the wireless communication system. is updated, reconfiguring an RRC connection between the base station and the user equipment, and transmitting data to the user equipment through the reconfigured RRC connection.

The data may include Packet Data Convergence Protocol (PDCP) packets having a plurality of serial numbers.

The establishing of the RRC connection includes: receiving an RRC connection re-establishment request from the user equipment; transmitting a message rejecting the RRC connection re-establishment to the user equipment; and receiving an RRC connection request from the user equipment and establishing the RRC connection.

When the RRC connection re-establishment is rejected, a resource corresponding to a Cell-Radio Network Temporary Identifier (C-RNTI) allocated to the user terminal may be released from the base station.

A method and apparatus for a user terminal to receive data may be provided.

A method and apparatus for a wireless communication system to transmit data may be provided.

1 is a block diagram of a wireless communication system for transmitting data to a user device through an NSA network according to an example.
2 illustrates a method for transmitting data to a user equipment through an SCG split bearer according to an example.
3 illustrates a connection relationship between a user device and a wireless communication system according to an example.
4 illustrates a handover of a user equipment according to an example.
5 illustrates a data transmission/reception method according to an embodiment.
6 is a block diagram of a user device according to an exemplary embodiment.
7 is a block diagram of a base station according to an embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the scope of the patent application is not limited or limited by these examples. Like reference numerals in each figure indicate like elements.

Various modifications may be made to the embodiments described below. It should be understood that the embodiments described below are not intended to limit the embodiments, and include all modifications, equivalents or substitutes thereto.

Terms used in the examples are only used to describe specific examples, and are not intended to limit the examples. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiment belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

In addition, in the description with reference to the accompanying drawings, the same components are assigned the same reference numerals regardless of the reference numerals, and the overlapping description thereof will be omitted. In the description of the embodiment, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the embodiment, the detailed description thereof will be omitted.

1 is a block diagram of a wireless communication system for transmitting data to a user device through an NSA network according to an example.

According to one aspect, a wireless communication system includes an Evolved Packet Core (EPC) 110 , an evolved Node B (eNB) 120 , and a next generation Node B (gNB) 130 . For example, the eNB 120 may be a Long Term Evolution (LTE) standard base station, and the gNB 130 may be a 5G standard base station.

As a method of providing a 5G standard wireless communication service, there are a standalone (SA) method using only the gNB 130 and a non-standalone (NSA) method using both the eNB 120 and the gNB 130 .

The interface between the Mobility Management Entity (MME) of the EPC 110 and the eNB 120 that is an LTE base station is interlocked with an S1-C (or S1-MME) interface, and between the S-GW of the EPC 110 and the eNB 120 The interface and the interface between the S-GW and the NR base station gNB 130 of the EPC 110 are interlocked with the S1-U interface. That is, the S1-C interface between the MME and the gNB 130 may not exist. The protocol of the interface between the gNB 130 and the eNB 120 may be interlocked using X2-U and X2AP. In a dual connectivity (EN-DC) environment of LTE and NR, the eNB 120 may be referred to as a Master Node (MN) and the gNB 130 may be referred to as a Secondary Node (SN).

The illustrated dotted line means a control plane, and paths 150 and 160 having double arrows mean a user plane.

According to one aspect, in order to transmit Packet Data Convergence Protocol (PDCP) data to the user equipment 140 in the EN-DC environment, two paths connected to the user equipment 140 using a split bearer (150 and 160) can be set. Efficient data transmission to the user device 140 may be performed via the two paths 150 and 160 .

2 illustrates a method for transmitting data to a user equipment through an SCG split bearer according to an example.

According to one aspect, an L2 layer operation of a split bearer on a downlink basis is shown. For example, a plurality of packets of PDCP data may be distributed and transmitted through the eNB 210 and the gNB 220 according to data transmission scheduling.

3 illustrates a connection relationship between a user device and a wireless communication system according to an example.

A non-access stratum (NAS) signaling connection between the user equipment 310 and the EPC 330 is an RRC connection between the user equipment 310 and the eNB 320 and an S1 signaling connection between the eNB 320 and the EPC 330. can be established

4 illustrates a handover of a user equipment according to an example.

A plurality of base stations 410 and 420 in a wireless communication system may provide coverages 411 and 421, respectively. A plurality of base stations 410 and 420 may be disposed such that some of the coverages 411 and 421 overlap each other. In order for the user equipment 430 to receive data through the wireless communication system, a downlink channel is established between the user equipment 430 and a base station of the wireless communication system.

In general, the base station 410 that can provide the user equipment 430 with the most efficient wireless communication environment may establish a communication channel with the user equipment 430 . As the location or communication environment of the user equipment 410 changes, a base station that can provide the most efficient wireless communication environment to the user equipment 430 may change. For example, when the base station 420 can provide the user equipment 430 with a better wireless communication environment than the base station 410 , the base station 420 performs handover to establish a channel with the user equipment 430 . is performed The base station 410 may be a source base station, and the base station 420 may be referred to as a target base station.

When data is transmitted in the EN-DC environment, the serial number of the next transmitted PDCP packet is transmitted through a serial number status transfer message between the user equipment 430 and the base station or between the base stations for data transmission. can tell you

However, when LTE handover or NR handover is performed, the serial number of the PDCP packet is reset in the target base station or the serial number of the already transmitted PDCP packet is transmitted, and the corresponding PDCP packet is discarded. can occur If this situation persists, a data deadlock occurs in which no further data is received.

According to one aspect, in order to resolve a data deadlock, a method of disconnecting and reconnecting an Internet Public Data Network (PDN) may be considered. When the Internet PDN is reconnected, the IP (Internet protocol) address of the user device 430 is changed and the Internet connection is initialized, so it takes a considerable amount of time for the user device 430 to receive data again.

According to another aspect, in order to resolve a data deadlock, a method of newly connecting a data radio bearer (DRB) may be considered. According to the above method, since the IP address of the user device 430 is not changed, the existing Internet connection can be maintained.

Hereinafter, a method of resolving a data deadlock by newly concatenating a DRB will be described in detail with reference to FIGS. 5 to 7 .

5 illustrates a data transmission/reception method according to an embodiment.

User device 502 may correspond to user devices 140 and 430 described above with reference to FIGS. 1 and 4 . The base station 504 may correspond to any one of the eNBs 120 , 210 , 320 , the gNBs 130 and 220 , and the plurality of base stations 410 and 420 described above with reference to FIGS. 1 to 4 . The EPC 506 may correspond to the EPCs 110 and 330 described above with reference to FIGS. 1 and 3 .

A data transmission/reception method or data deadlock resolution method includes the steps of: i) determining whether a state in which a user equipment 502 receives data transmitted from a base station 504 of a wireless communication system is a deadlock state; ii) when the data reception state is a deadlock state, establishing an RRC connection with the base station 504 and the user equipment 502; iii) when the RRC connection is established, updating the tracking area (TA) of the user equipment through the Mobility Management Entity (MME) of the EPC of the wireless communication system; iv) when the TA is updated, reconfiguring the RRC connection between the base station 504 and the user equipment 502 .

i) Determining whether the state in which the user equipment 502 receives data transmitted from the base station 504 of the wireless communication system is a deadlock includes a step 510 below.

In step 510 , the user equipment 510 determines whether the state of receiving data transmitted from the base station 504 is a deadlock state. For example, the data includes PDCP packets having a plurality of serial numbers.

According to one aspect, the user device 510 determines whether at least one packet of valid data is received for a preset time period (eg, 10 seconds). For example, determine whether a target serial number of a received target packet corresponds to a reference serial number of at least one previously received packet, and if the target serial number does not correspond to the reference serial number, the target packet can be determined as a valid packet. When a valid packet is not received, the user device 510 may determine that the data receiving state is a deadlock state.

ii) When the data reception state is a deadlock state, the step of establishing an RRC connection with the base station 504 and the user equipment 502 includes the following steps 515 to 530 .

In step 515 , the user equipment 502 transmits an RRC connection reestablishment request to the base station 504 . A specific bit indicating a data deadlock may be indicated in the target field in the message of the RRC connection re-establishment request. For example, the target field may be a reserved field, and a specific bit may be '01'.

In step 520 , when the target field of the received message indicates a data deadlock, the base station 504 transmits a message rejecting the RRC connection re-establishment to the user equipment 502 . When the RRC connection re-establishment is rejected, the resource corresponding to the Cell-Radio Network Temporary Identifier (C-RNTI) allocated to the user equipment 502 may be released from the base station 504 .

In step 525 , the user equipment 502 sends an RRC connection request to the base station 504 .

In step 530 , the base station 504 establishes an RRC connection between the base station 504 and the user equipment 502 based on the RRC connection request.

iii) when the RRC connection is established, updating the TA of the user equipment through the MME of the EPC of the wireless communication system includes the following steps 535 and 540 .

In step 535 , the user equipment 502 sends a TA update request to the MME of the EPC 506 . Upon receiving the TA update request, the MME updates the TA of the user equipment 502 .

At step 540 , the EPC 506 sends a TA update acknowledgment to the user device 502 .

iv) if the TA is updated, reconfiguring the RRC connection between the base station 504 and the user equipment 502 includes the following steps 545 and 550 .

In step 545 , the base station 504 sends a message of RRC connection reconfiguration to the user equipment 502 . Upon receiving the message of RRC connection reconfiguration, the user equipment 502 reconfigures the RRC connection based on the message. When the RRC connection is reconfigured, the DRB of the Internet PDN is newly connected (or allocated), and data reception of the user equipment 502 is enabled.

In step 550 , the user equipment 550 transmits a message of RRC connection reconfiguration complete to the base station 504 .

According to the above method, since the DRB is newly allocated instead of reconnecting the existing Internet PDN itself, the Internet connection is not initialized, so the time until data transmission and reception is possible is shorter than the method of reconnecting the Internet PDN itself. can be significantly reduced. Also, according to the above method, since the IP address of the user device 502 is not changed, the existing Internet connection can be maintained.

6 is a block diagram of a user device according to an exemplary embodiment.

The user device 502 includes a communication unit 610 , a processor 620 , and a memory 630 .

The communication unit 610 is connected to the processor 620 and the memory 630 to transmit and receive data. The communication unit 610 may be connected to another external device to transmit/receive data. The expression “transmitting/receiving” “A” may indicate transmitting/receiving “information or data representing A”.

The communication unit 610 may be implemented as circuitry in the user device 502 . For example, the communication unit 610 may include an internal bus and an external bus. As another example, the communication unit 610 may be an element that connects the user device 502 and an external device. The communication unit 610 may be an interface. The communication unit 610 may receive data from an external device and transmit the data to the processor 620 and the memory 630 .

The processor 620 processes data received by the communication unit 610 and data stored in the memory 630 . A “processor” may be a data processing device implemented in hardware having circuitry having a physical structure for performing desired operations. For example, desired operations may include code or instructions included in a program. For example, a data processing device implemented as hardware includes a microprocessor, a central processing unit, a processor core, a multi-core processor, and a multiprocessor. , an Application-Specific Integrated Circuit (ASIC), and a Field Programmable Gate Array (FPGA).

Processor 620 executes computer readable code (eg, software) stored in memory (eg, memory 630 ) and instructions issued by processor 620 .

The memory 630 stores data received by the communication unit 610 and data processed by the processor 620 . For example, the memory 630 may store a program (or an application, software). The stored program may be a set of syntaxes coded to receive data by resolving data deadlock and executable by the processor 620 .

According to one aspect, memory 630 may include one or more of volatile memory, non-volatile memory and random access memory (RAM), flash memory, hard disk drive, and optical disk drive.

The memory 630 stores a set of instructions (eg, software) for operating the user device 502 . The set of instructions for operating the user device 502 is executed by the processor 620 .

7 is a block diagram of a base station according to an embodiment.

The base station 504 includes a communication unit 710 , a processor 720 , and a memory 730 .

The communication unit 710 is connected to the processor 720 and the memory 730 to transmit and receive data. The communication unit 710 may be connected to another external device to transmit/receive data.

The communication unit 710 may be implemented as a circuit network within the base station 504 . For example, the communication unit 710 may include an internal bus and an external bus. As another example, the communication unit 710 may be an element connecting the base station 504 and an external device. The communication unit 710 may be an interface. The communication unit 710 may receive data from an external device and transmit the data to the processor 720 and the memory 730 .

The processor 720 processes data received by the communication unit 710 and data stored in the memory 730 . Processor 720 executes computer readable code (eg, software) stored in memory (eg, memory 730 ) and instructions issued by processor 720 .

The memory 730 stores data received by the communication unit 710 and data processed by the processor 720 . For example, the memory 730 may store a program (or an application, software). The stored program may be a set of syntax that is coded so as to transmit data by resolving data deadlock and is executable by the processor 720 .

According to one aspect, memory 730 may include one or more of volatile memory, non-volatile memory and RAM, flash memory, hard disk drives, and optical disk drives.

The memory 730 stores a set of instructions (eg, software) for operating the base station 504 . The set of instructions for operating the base station 504 is executed by the processor 720 .

The device described above may be implemented as a hardware component, a software component, and/or a combination of the hardware component and the software component. For example, devices and components described in the embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA), It may be implemented using one or more general purpose or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For convenience of understanding, although one processing device is sometimes described as being used, one of ordinary skill in the art will recognize that the processing device includes a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that can include For example, the processing device may include a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as parallel processors.

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

As described above, although the embodiments have been described with reference to the limited embodiments and drawings, various modifications and variations are possible from the above description by those skilled in the art. For example, the described techniques are performed in a different order than the described method, and/or the described components of the system, structure, apparatus, circuit, etc. are combined or combined in a different form than the described method, or other components Or substituted or substituted by equivalents may achieve an appropriate result.

200: electronic device
300: server
500: relay device

Claims (23)

A method of receiving data, performed by a user device, comprises:
determining whether a state of receiving data transmitted from a base station of a wireless communication system is a deadlock state;
establishing a radio resource control (RRC) connection with the base station when the data reception state is a deadlock state;
updating a tracking area (TA) of the user equipment through a Mobility Management Entity (MME) of an Evolved Packet Core (EPC) of the wireless communication system when the connection is established; and
When the TA is updated, reconfiguring the RRC connection with the base station
including,
The user equipment receives the data through the reconfigured RRC connection,
The step of establishing an RRC connection with the base station includes:
transmitting an RRC connection re-establishment request to the base station;
Receiving a message rejecting the RRC connection re-establishment from the base station - When the RRC connection re-establishment is rejected, the resource corresponding to the C-RNTI (Cell-Radio Network Temporary Identifier) allocated to the user equipment is the Released at base station -;
transmitting an RRC connection request to the base station; and
Establishing the RRC connection with the base station
containing,
How to receive data.
According to claim 1,
The data includes Packet Data Convergence Protocol (PDCP) packets having a plurality of serial numbers,
How to receive data.
According to claim 1,
Determining whether the state of receiving the data is a deadlock state comprises:
determining whether at least one packet of the data valid for a preset time is received; and
determining that the state of receiving the data is a deadlock if no valid packet is received;
containing,
How to receive data.
4. The method of claim 3,
determining whether at least one packet of the data valid for the preset time is received,
determining whether a target serial number of a received target packet corresponds to a reference serial number of at least one previously received packet; and
determining the target packet as a valid packet when the target serial number does not correspond to the reference serial number
containing,
How to receive data.
delete delete According to claim 1,
Updating the TA of the user equipment comprises:
sending a TA update request to the MME; and
Receiving a TA renewal approval from the MME
containing,
How to receive data.
According to claim 1,
The step of reconfiguring the RRC connection with the base station,
receiving an RRC connection reconfiguration from the base station; and
Transmitting the completion of the RRC connection reconfiguration to the base station
containing,
How to receive data.
A computer-readable recording medium storing a program for performing the method of any one of claims 1 to 4, 7 and 8.
Your device is
a memory in which a program for receiving data is recorded; and
a processor that executes the program
including,
The program is
determining whether a state of receiving data transmitted from a base station of a wireless communication system is a deadlock state;
establishing a radio resource control (RRC) connection with the base station when the data reception state is a deadlock state;
updating a tracking area (TA) of the user equipment through a Mobility Management Entity (MME) of an Evolved Packet Core (EPC) of the wireless communication system when the connection is established;
When the TA is updated, reconfiguring the RRC connection with the base station
do,
The user equipment receives the data through the reconfigured RRC connection,
The step of establishing an RRC connection with the base station includes:
transmitting an RRC connection re-establishment request to the base station;
Receiving a message rejecting the RRC connection re-establishment from the base station - When the RRC connection re-establishment is rejected, the resource corresponding to the C-RNTI (Cell-Radio Network Temporary Identifier) allocated to the user equipment is the Released at base station -;
transmitting an RRC connection request to the base station; and
Establishing the RRC connection with the base station
containing,
user device.
11. The method of claim 10,
The data includes Packet Data Convergence Protocol (PDCP) packets having a plurality of serial numbers,
user device.
delete delete 11. The method of claim 10,
Updating the TA of the user equipment comprises:
sending a TA update request to the MME; and
Receiving a TA renewal approval from the MME
containing,
user device.
11. The method of claim 10,
The step of reconfiguring the RRC connection with the base station,
receiving an RRC connection reconfiguration from the base station; and
Transmitting the completion of the RRC connection reconfiguration to the base station
containing,
user device.
A data transmission method, performed by a wireless communication system, including a base station and an Evolved Packet Core (EPC), includes:
establishing, by the base station, a Radio Resource Control (RRC) connection with the user equipment when the data reception state of the user equipment is a deadlock state;
updating a tracking area (TA) of the user equipment through a Mobility Management Entity (MME) of the EPC when the connection is established; and
When the TA is updated, reconfiguring the RRC connection between the base station and the user equipment
including,
transmitting the data to the user device through the reconfigured RRC connection;
The step of establishing the RRC connection comprises:
receiving an RRC connection re-establishment request from the user equipment;
transmitting a message rejecting the RRC connection re-establishment to the user equipment - When the RRC connection re-establishment is rejected, a resource corresponding to a C-RNTI (Cell-Radio Network Temporary Identifier) allocated to the user equipment is released at the base station;
receiving an RRC connection request from the user equipment; and
establishing the RRC connection
containing,
data transmission method.
17. The method of claim 16,
The data includes Packet Data Convergence Protocol (PDCP) packets having a plurality of serial numbers,
data transmission method.
delete delete The base station of the wireless communication system,
a memory in which a program for transferring data is recorded; and
a processor that executes the program
including,
The program is
establishing a Radio Resource Control (RRC) connection between the base station and the user equipment when the data reception state of the user equipment is a deadlock state;
reconfiguring an RRC connection between the base station and the user equipment when the tracking area (TA) of the user equipment is updated through a Mobility Management Entity (MME) of an Evolved Packet Core (EPC) of the wireless communication system; and
transmitting data to the user equipment through the reconfigured RRC connection;
including,
The step of establishing the RRC connection comprises:
receiving an RRC connection re-establishment request from the user equipment;
transmitting a message rejecting the RRC connection re-establishment to the user equipment. When the RRC connection re-establishment is rejected, the resource corresponding to the C-RNTI (Cell-Radio Network Temporary Identifier) allocated to the user equipment is the Released at base station -;
receiving an RRC connection request from the user equipment; and
establishing the RRC connection
containing,
base station.
21. The method of claim 20,
The data includes Packet Data Convergence Protocol (PDCP) packets having a plurality of serial numbers,
base station. delete delete

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