KR102055803B1 - Method for controlling activation of redundant packet transmission and mobile communication device applying same - Google Patents

Abstract

According to an embodiment of the present invention, a method for controlling whether packet redundancy transmission is performed by a transmitting device for transmitting data to a receiving device through a wireless channel includes a plurality of frequency bands for transmitting data through the wireless channel. Transmitting a data packet to the transmitting apparatus using one fundamental frequency band, determining whether to activate a packet redundant transmission mode, and when the packet redundant transmission mode is activated, the basic one of the plurality of frequency bands. And transmitting the duplicate packet generated by duplicating the data packet to the transmitting device using an additional frequency band different from the frequency band.

Description

Method for controlling packet redundancy transmission and a mobile communication device to which the method is applied {METHOD FOR CONTROLLING REDIVANT PACKET TRANSMISSION AND MOBILE COMMUNICATION DEVICE APPLYING SAME}

The present invention relates to a method for controlling packet redundancy transmission to improve reliability of a service and to minimize delay in providing a mobile communication service, and a mobile communication device to which the method is applied.

With the improvement of living standards and the development of information and communication technology, the vast majority of people are receiving mobile communication service through personal mobile communication terminals such as smartphones. In addition, the contents that can be used through such a mobile communication terminal is also getting higher day by day. Accordingly, the amount of data used by mobile subscribers is increasing exponentially, and the demand for high quality mobile communication service capable of transmitting higher capacity data at higher speed and reliability is increasing.

Recently, data can be simultaneously transmitted through a plurality of different frequency bands by using a carrier aggregation technology (CA), which is a technology that aggregates a plurality of component carriers (CCs) to configure one broadband. Do. In addition, in the latest mobile communication standards such as 5G (5-generation) new radio (NR) system, ultra-reliable and low latency (ULRRC) services for discussing such high reliability and ultra low delay conditions are discussed.

This latest trend reflects the efforts to provide higher quality mobile communication services to users as described above. In particular, the 5G NR system requires a very short latency of 10ms (based on end-to-end latency) as one of the performance requirements. In order to achieve such a high level of requirements, there is a need for a proposal of a new mobile communication scheme that enables high-speed data transmission at a lower error rate.

Korean Patent Publication No. 10-2015-0009456 (published Jan. 26, 2015)

The problem to be solved by the present invention is a method for controlling the transmission of data packets in order to provide a higher quality mobile communication service by improving the reliability of the service and to minimize the delay in providing a mobile communication service, and the method is applied It is to provide a mobile communication device.

However, the problem to be solved by the present invention is not limited to those mentioned above, another problem to be solved is not mentioned can be clearly understood by those skilled in the art from the following description. will be.

According to an embodiment of the present invention, a method for controlling whether packet redundancy transmission is performed by a transmitting device for transmitting data to a receiving device through a wireless channel includes a plurality of frequency bands for transmitting data through the wireless channel. Transmitting a data packet to the transmitting apparatus using one fundamental frequency band, determining whether to activate a packet redundant transmission mode, and when the packet redundant transmission mode is activated, the basic one of the plurality of frequency bands. And transmitting the duplicate packet generated by duplicating the data packet to the transmitting device using an additional frequency band different from the frequency band.

According to an embodiment of the present invention, a transmitting apparatus for transmitting data to a receiving apparatus through a wireless channel to which a method for controlling packet overlapping transmission is activated, includes a control unit for determining whether to activate a packet redundant transmission mode and the wireless channel. When a data packet is transmitted to the transmitting apparatus using a basic frequency band, which is one of a plurality of frequency bands for data transmission, and when the packet redundant transmission mode is activated, the basic frequency band of the plurality of frequency bands It may include a data communication unit for transmitting a duplicate packet generated by copying the data packet to the transmitting device using a different additional frequency band.

According to an embodiment of the present invention, whether or not to activate a packet redundant transmission mode for redundantly transmitting data packets may be adaptively determined in consideration of various factors related to the state of a wireless channel. As a result, it becomes possible to utilize radio resources more efficiently, to provide users with high reliability and ultra-low latency services required by the latest mobile communication standards, and ultimately improve the users' satisfaction with mobile communication services. Can be.

1 is a diagram schematically illustrating a mobile communication system according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a case where dual connectivity (DC) is applied in a mobile communication system according to an embodiment of the present invention.
3 is a diagram illustrating a configuration of a transmitting device to which a method for controlling whether to activate packet redundancy according to an embodiment of the present invention is applied.
4 is a diagram illustrating each step of a method for controlling packet redundancy transmission according to an embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. The terms to be described below are terms defined in consideration of functions in the embodiments of the present invention, which may vary according to the intention or custom of the subscriber or the operator. Therefore, the definition should be made based on the contents throughout the specification.

1 is a diagram schematically illustrating a mobile communication system according to an embodiment of the present invention. The mobile communication system 10 of FIG. 1 may include a transmitter 100 and a receiver 200. The transmitting device 100 may transmit data to the receiving device 200 through the wireless channel 300. Here, the roles of the transmitting device 100 and the receiving device 200 are not necessarily fixed. For example, in downlink (DL) data transmission, a base station (eNodeB) becomes a transmitting device 100 and a user entity (UE) present in coverage of the base station receives a receiving device 200. However, in uplink (UL) data transmission, the terminal may be a transmitting device 100 and the base station 200 may be a receiving device.

The transmitting apparatus 100 may transmit a packet data convergence protocol (PDCP) 101, a radio link control (102, 103), a medium access control (104), a MAC (physical, PHY) for data transmission to the receiving apparatus 200, and the like. 105, 106, and the like. The transmitter 100 may transmit a data packet to the receiver 200 using a plurality of frequency bands by carrier aggregation. Since specific details of each layer are already known, a detailed description thereof will be omitted herein.

The data packet transmitted using the primary frequency band (primary cell or Pcell, 310) among the plurality of frequency bands sequentially processes the PDCP 101, the basic RLC 102, the MAC 104, and the first PHY 105. It may be transmitted to the receiving device 200 through. The data packet transmitted using an additional frequency band (primary cell or Pcell, 320) different from the basic frequency band among the plurality of frequency bands is PDCP 101, additional RLC 103, MAC 104 and PHY No. 2. It may be transmitted to the receiving device 200 sequentially through the 105.

As mentioned at the outset, the latest mobile communication standards, such as the 5G NR specification, are required to meet stringent high reliability and ultra low latency conditions. Accordingly, in an embodiment of the present invention, in a multi connectivity (MC) situation in which a plurality of bands may be used, such as dual connectivity (DC) or carrier aggregation, transmission using the basic frequency band 310 is performed. PDCP duplication, which duplicately transmits the same duplicated packet as the data packet to be transmitted using the additional frequency band 320, may be introduced, and the packet duplication transmission mode may be appropriately selected according to circumstances.

Since the duplicate packet may have the same sequence number (SN) as the original data packet, the reception apparatus 200 receives the original data packet when the duplicate packet is normally received even when the original packet is not normally received. Can be considered, and the reception of the next number of data packets can continue without problem. Therefore, according to the configuration of the present invention, it is possible to prevent the loss of packets due to the poor state of the wireless channel 300 to increase the reliability, while preventing the delay due to packet retransmission using the same band, the latest movement The requirements of the communication standard can be more easily satisfied.

FIG. 2 is a diagram illustrating a case where dual connectivity (DC) is applied in a mobile communication system according to an embodiment of the present invention. A transmission line 300 that can be implemented through a backhaul or the like may be connected between the master base station (master eNodeB or MeNB. 20) and the secondary base station (secondary eNodeB or SeNB) 30 of the mobile communication system 10. . In this case, in the downlink data transmission, the master base station 20 and the secondary base station 30 may be defined together as the transmitting device 100 and the terminal 40 as the receiving device 200, respectively. In this case, the terminal 40 may be defined as the transmitting device 100, and the master base station 20 and the secondary base station 30 may be defined as the receiving device 200.

The terminal 40 may basically perform data communication through the master base station 20, but in some cases, the master base station 20 may partially transfer data to and from the terminal 40 through the secondary base station 30. You can do that. When the embodiment of the present invention is applied to such a dual access system, the master base station 20 may use the basic frequency band 310 and the secondary base station 30 may use the additional frequency band 320.

Accordingly, the master base station 20 generates a duplicate packet in a state in which the packet redundancy transmission mode is activated, transmits the original data packet directly to the terminal 40, and transmits the duplicate packet to the secondary base station 30. 30 may be transmitted to the terminal 40. Of course, in this case, the configuration for transmitting data through the additional frequency band 320 of the configuration of the transmitting apparatus 100 of FIG. 1 may be located in the secondary base station 30, not the master base station 20, for this purpose The MAC 104 layer may also be divided into two and located in the master base station 20 and the secondary base station 30, respectively.

3 is a diagram illustrating a configuration of a transmitting device to which a method for controlling whether to activate packet redundancy according to an embodiment of the present invention is applied. The transmitting device 100 of FIG. 3 may include a state determination unit 110, a control unit 120, and a data communication unit 130. However, since the description of the components of the transmitting apparatus 100 of FIG. 3 is only an embodiment of the present invention, the technical idea of the present invention is not limitedly interpreted by FIG. 3. Hereinafter, an operation of each component of the transmitter 100 will be described with reference to FIG. 3, and a detailed operation thereof will be described with reference to FIG. 4.

The state determiner 110 may collect information about the state of the wireless channel 300 to determine whether the packet redundant transmission mode is activated. The state information of the wireless channel 300 may be, for example, information about a quality of a signal transmitted through the wireless channel 300 or a degree of scheduling delay for data transmission through the wireless channel 300. In addition, the state determination unit 110 may calculate an activation index, which is a digitized index having a value inversely proportional to the signal quality and proportional to the degree of scheduling delay, based on the information. The state determination unit 110 may be implemented by including a computing device such as a microprocessor, and the control unit 120 to be described later is also the same.

The controller 120 may determine whether to activate the packet redundant transmission mode based on the information obtained or calculated by the state determiner 110. When the packet overlapping transmission mode is not activated, the data communication unit 130 may transmit the data packet to the receiving device 200 using only the basic frequency band 310. In contrast, when the packet redundancy transmission mode is activated, the data communication unit 130 may further transmit the same duplicate packet as the data packet to the receiving device 200 using the additional frequency band 320. Detailed criteria for activating the packet overlapping transmission mode will be described in detail with reference to FIG. 3 below. The data communication unit 130 may include a data bus or a wired / wireless communication module for transmitting and receiving data.

4 is a diagram illustrating each step of a method for controlling packet redundancy transmission according to an embodiment of the present invention. However, since the method shown in FIG. 4 is only an embodiment of the present invention, the spirit of the present invention is not limitedly interpreted by FIG. 4, and each step of the method shown in FIG. Of course it can be performed by different. In addition, the description may be omitted for overlapping with FIGS. 1 to 3.

First, the state determination unit 110 may collect information about the environment of the wireless channel 300 (S110). In terms of practical implementation, PDCP 101 performing packet replication may collect information from lower layers RLC 102, 103, MAC 104 and PHY 105, 106. Each layer of the RLC 102, 103, MAC 104, and PHY 105, 106 may directly transmit information to the PDCP 101 layer. An interface may be used. Alternatively, one of the layers may collect information of another layer and pass the information to the PDCP 101 layer. In this case, interfaces ④ to ⑥ of the control signal path of FIG. 1 may be used.

An example of the information collected in step S110 is as follows. In the case of downlink data transmission, the transmitting apparatus 100 becomes a base station, and the base station acquires signal quality information managed by itself or signal quality information received from a terminal, which is the receiving apparatus 200, and uses the obtained information to obtain a packet. It is possible to determine whether to activate the redundant transmission mode. In addition, the radio resource related information of the radio channel 300 may be obtained by the base station, and the radio resource related information may eventually be in communication with the generation degree of the scheduling delay. In contrast, in the case of uplink data transmission, the transmitting device 100 becomes a terminal. At this time, the determining agent for collecting information and activating the packet duplication transmission mode may be a base station as well as a terminal.

On the other hand, the following information is an example and is not necessarily limited thereto. In addition, the following information may be collected by any of the layers of the above-mentioned RLC 102, 103, MAC 104, and PHY 105, 106.

(Downlink data In transmission  Information that can be used)

One. Information about the signal quality held by the base station

 ■ Signal quality information managed by the base station: DL SINR, DL allocation MCS, DL BLER (using ACK / NACK / Erasure of DL HARQ), DL RLC error rate (using ACK / NACK / Timeout of DL RLC), etc.

 ■ Signal quality information received by the base station from the terminal: CQI, RI, PMI (Precoding Matrix Indicator), beam (Beam) information, RSRP in the measurement report, RSRQ, etc.

2. Information related to downlink radio resources possessed by the base station

 The number of DL concurrent accessors connected to the base station, the number of concurrent accessors with DL data, DL radio resource share (DL PRB (Physical Resource Block) Usage), DL allocation radio resource amount per terminal, DL allocation scheduling delay per terminal ) Or jitter information

(Uplink data In transmission  Information that can be used)

One. Information that can be used to determine whether the base station is activated

 ■ Signal quality information of base station

  Signal quality information managed by the base station: UL reception SINR, UL allocation MCS, UL BLER, UL reception interference, UL reception RSSI, UL RLC packet error rate, UL PDCP packet error rate, etc.

  Signal quality information received from the base station from the terminal: UL PHR, etc.

 ■ Information related to uplink radio resources held by the base station

  The number of UL concurrent accessors connected to the base station, the number of concurrent accessors with UL data, UL radio resource share (DL PRB (Physical Resource Block) Usage) per unit, UL allocation radio resource amount per unit, UL allocation scheduling delay per unit or jitter information Etc

2. Information that can be used to determine whether the terminal is activated

 ■ Signal quality information received by the UE: UL allocation MCS, UL BLER (using ACK / NACK / ERASURE of UL HARQ), PDCCH missing rate, UL RLC error rate (using ACK / NACK / Timeout of UL RLC), DL Receive RSRP / RSRQ / Beam Quality etc

 ■ Information on the uplink radio resource received by the terminal

  -UL allocation radio resource amount per terminal, UL allocation scheduling delay per unit or jitter information, etc.

According to an embodiment of the present invention, two methods may be used for each layer collecting the information to transmit information to the PDCP 101 layer, and each method may be used alone or in combination with other methods. Can be. First is the periodic delivery method. This means that when the transmitting device 100 is configured to use the packet redundancy transmission mode in a radio resource control (RRC) reconfiguration procedure, each layer that collects the information thereafter directly transfers the information to the PDCP 101 layer. Or it is delivered periodically through other layers. Second, event-driven delivery. This is a method of delivering only when a given condition (a condition for switching whether the packet redundant transmission mode is activated) is satisfied, instead of performing the periodic delivery.

Based on the collected information, the controller 120 may determine whether to activate the packet duplication transmission mode (S120). More specifically, first, the state determination unit 110 may calculate a numerical indicator for determining whether to activate on the basis of the information, hereinafter referred to as "activation index" for convenience. According to the general principle, the activation index may be calculated to have a value inversely proportional to the quality of the signal according to the collected information and proportional to the degree of scheduling delay. This is to activate the packet redundancy transmission mode when it is determined that the signal quality is not good and the scheduling delay is high, that is, when it is determined that the data packet is not normally transmitted.

The method for calculating the activation index can be adopted as long as it is within the scope of the general principle. As an example, each of the collected information may be digitized, multiplied by each weighted value of importance, and then added together. In this case, the weight of the information to be excluded may be set to 0 so that the information does not affect the activation index.

The controller 120 may determine whether to activate the packet redundant transmission mode using the activation index. Specifically. When the packet duplication transmission mode is not activated, the controller 120 switches to the activated state when the packet duplication transmission mode is activated when the activation index exceeds a predetermined first threshold, and when the packet duplication transmission mode is activated, When the activation index is less than the second predetermined threshold, the packet duplication transmission mode may be switched to an unactivated state. At this time, the first threshold may be set to have a value larger than the second threshold, to prevent a ping-pong phenomenon in which switching is made too frequently.

Of course, various other methods may be applied to the controller 120 in order to determine whether the activation is performed. Therefore, the present invention is not limited to the above description. In addition, the control unit 120 may use the information calculated for the basic frequency band 310 when switching from the inactive state to the active state, and calculates for the basic frequency band 310 when switching from the active state to the inactive state. At least one of the calculated information and information calculated for the additional frequency band 320 may be used. Preferably, the controller 120 may use only information on the basic frequency band 310 or both information about both bands.

Meanwhile, as described above, when the transmitting device 100 is a terminal, the base station, which is the receiving device 200 instead of the terminal itself, may determine whether to activate. In this case, the data communication unit 130 may receive information on whether to activate the packet duplication transmission mode determined by the base station from the base station, and the controller 120 determines whether to activate the packet duplication transmission mode based on the received information. By determining the, it is possible to substantially follow the terminal to determine whether to activate the base station.

Table 1 below summarizes each piece of information that can be used in the above-described uplink or downlink data transmission, in which case affects packet duplication transmission mode activation and in some cases, deactivation. Instead of using the activation index, which is an overall indicator, the control unit 120 examines whether each piece of information exceeds or falls below a threshold set for each piece of information according to the following table, and activates it based on the result of the survey. Can be determined.

On the other hand, in Table 1 below, "more than" may be replaced by "more than", "less than" may be replaced by "less than". Here too, the threshold in the activation condition and the threshold in the deactivation condition may be set differently, which is also to prevent the ping-pong phenomenon in which the switching is too frequent.

DL /
UL Judgment subject Type of information Activation condition Deactivation Condition Downlink
(DL) Base station DL SINR Below threshold Threshold exceeded DL allocation MCS Below threshold Threshold exceeded DL BLER Threshold exceeded Below threshold DL RLC Error Rate Threshold exceeded Below threshold Signal quality information reported by the terminal (CQI, RI, etc.) Below threshold Threshold exceeded Number of DL concurrent users connected to base station Threshold exceeded Below threshold Number of concurrent users with DL data Threshold exceeded Below threshold DL radio resource share per cell Threshold exceeded Below threshold DL resource allocation per terminal Below threshold Threshold exceeded End-to-end DL allocation scheduling delay or jitter Threshold exceeded Below threshold DL PDCP Packet Error Rate Reported by UE Threshold exceeded Below threshold Uplink
(UL) Base station UL Receive SINR Below threshold Threshold exceeded UL assigned MCS Below threshold Threshold exceeded UL BLER Threshold exceeded Below threshold UL Receive Interference or RSSI Threshold exceeded Below threshold UL RLC Packet Error Rate Threshold exceeded Below threshold Signal quality information reported by the terminal (UL PHR, etc.) Below threshold Threshold exceeded UL concurrent users connected to the base station Threshold exceeded Below threshold Number of concurrent users with UL data Threshold exceeded Below threshold UL radio resource share per cell Threshold exceeded Below threshold UL allocated radio resource amount per terminal Below threshold Threshold exceeded End-to-end UL allocation scheduling delay or jitter Threshold exceeded Below threshold UL PDCP Packet Error Rate Threshold exceeded Threshold exceeded Terminal UL assigned MCS Below threshold Threshold exceeded UL BLER Threshold exceeded Below threshold PDCCH Loss Rate Threshold exceeded Below threshold UL RLC Error Rate Threshold exceeded Below threshold DL Receive RSRP / RSRQ / Beam Quality Below threshold Threshold exceeded UL allocated radio resource amount per terminal Below threshold Threshold exceeded End-to-end UL allocation scheduling delay or jitter Threshold exceeded Below threshold

As described above, when it is determined whether to activate the packet redundancy transmission mode, the data communication unit 130 may transmit the data packet to the receiving apparatus 200 as determined (S130 to S160). Specifically, the data communication unit 130 transmits only the original data packet using the basic frequency band 310 when the packet redundancy transmission mode is not activated, and in addition to the transmission of the original data packet, the original data packet is duplicated if the packet redundant transmission mode is activated. The duplicate packet generated by using the additional frequency band 320 may be transmitted. In terms of practical implementation, duplicate packets may be generated at the PDCP 101 layer.

According to one embodiment of the present invention described so far, it is possible to increase the reliability in packet transmission and to prevent a delay due to packet retransmission using the same band. As a result, it becomes possible to utilize radio resources more efficiently, to provide users with high reliability and ultra-low delay services required by the latest mobile communication standards, and ultimately improve the users' satisfaction with mobile communication services. Can be.

Combinations of each block of the block diagrams and respective steps of the flowcharts attached to the present invention may be performed by computer program instructions. These computer program instructions may be mounted on an encoding processor of a general purpose computer, special purpose computer, or other programmable data processing equipment such that the instructions executed by the encoding processor of the computer or other programmable data processing equipment are not included in each block or block diagram. It will create means for performing the functions described in each step of the flowchart. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in each block or flowchart of each step of the block diagram. Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions that perform processing equipment may also provide steps for performing the functions described in each block of the block diagram and in each step of the flowchart.

In addition, each block or step may represent a portion of a module, segment or code that includes one or more executable instructions for executing a specified logical function (s). It should also be noted that in some alternative embodiments, the functions noted in the blocks or steps may occur out of order. For example, the two blocks or steps shown in succession may in fact be executed substantially concurrently, or the blocks or steps may sometimes be performed in the reverse order, depending on the functionality involved.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential quality of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas that fall within the scope of equivalents should be construed as being included in the scope of the present invention.

According to an embodiment of the present invention, it becomes possible to utilize radio resources more efficiently, and to provide users with high reliability and ultra low delay services required by the latest mobile communication standards, and ultimately provide mobile communication services. Users' satisfaction can be improved.

10: mobile communication system
20: master base station
30: secondary base station
40: terminal
100: transmitting device
110: state determination unit
120: control unit
130: data communication unit
200: receiving device
300: wireless channel

Claims (15)

A method performed by a transmitting device for transmitting data to a receiving device over a wireless channel, the method comprising:
Transmitting a data packet to the transmitting device using a basic frequency band, which is one of a plurality of frequency bands for data transmission through the wireless channel;
Determining whether to activate a packet redundant transmission mode; And
Transmitting the duplicated packet generated by duplicating the data packet to the transmitting apparatus by using an additional frequency band different from the basic frequency band among the plurality of frequency bands when the packet redundant transmission mode is activated. ,
The determining step,
Calculating an activation index having a value inversely proportional to the quality of a signal transmitted on the wireless channel and proportional to the degree of scheduling delay for data transmission on the wireless channel; And
When the packet redundancy transmission mode is not activated, when the activation index exceeds a predetermined first threshold, the packet redundancy transmission mode is switched to an activated state, and when the packet redundancy transmission mode is activated, the Transitioning to a non-activated state of the packet redundancy mode if an activation index falls below a predetermined second threshold.
How to control whether packet redundancy is enabled. The method of claim 1,
The duplicate packet has the same sequence number (SN) as the data packet.
How to control whether packet redundancy is enabled. The method of claim 1,
The first threshold and the second threshold are different
How to control whether packet redundancy is enabled.
delete The method of claim 3, wherein
The first threshold has a value greater than the second threshold.
How to control whether packet redundancy is enabled. The method of claim 1,
The quality of the signal and the degree of the scheduling delay are calculated using the basic frequency band when the packet redundant transmission mode is inactivated, and the basic frequency band and the additional frequency when the packet redundant transmission mode is activated. Calculated using at least one of the bands
How to control whether packet redundancy is enabled. A transmitting device for transmitting data to a receiving device through a wireless channel,
A controller for determining whether to activate a packet redundant transmission mode;
When a data packet is transmitted to the transmitting apparatus by using a fundamental frequency band, which is one of a plurality of frequency bands for data transmission through the wireless channel, and the packet redundant transmission mode is activated, the plurality of frequency bands may be used. A data communication unit for transmitting a duplicate packet generated by copying the data packet to the transmitting apparatus by using an additional frequency band different from the basic frequency band; and
And a state determination unit calculating an activation index having a value inversely proportional to the quality of a signal transmitted through the wireless channel and proportional to a degree of a scheduling delay for data transmission through the wireless channel.
When the packet duplication transmission mode is not activated, the control unit switches to the state where the packet duplication transmission mode is activated when the activation index exceeds a predetermined first threshold, and the packet duplication transmission mode is activated. If present, the packet duplication transmission mode is not activated when the activation index is below a predetermined second threshold.
Transmitter to which the control method for enabling packet redundancy is applied. The method of claim 7, wherein
The duplicate packet has the same sequence number (SN) as the data packet.
Transmitter to which the control method for enabling packet redundancy is applied. The method of claim 7, wherein
The first threshold and the second threshold are different
Transmitter to which the control method for enabling packet redundancy is applied.
delete The method of claim 9,
The first threshold has a value greater than the second threshold.
Transmitter to which the control method for enabling packet redundancy is applied. The method of claim 7, wherein
The state determining unit calculates the quality of the signal and the degree of the scheduling delay by using the fundamental frequency band when the packet redundant transmission mode is inactivated, and when the packet redundant transmission mode is activated, the basic frequency. Calculating using at least one of a band and the additional frequency band
Transmitter to which the control method for enabling packet redundancy is applied. The method of claim 7, wherein
The transmitting device is a mobile communication base station, and the receiving device is a mobile communication terminal present in coverage of the mobile communication base station,
The quality of the signal is calculated based on at least one of signal quality information obtained by the state determination unit and signal quality information received from the terminal.
Transmitter to which the control method for enabling packet redundancy is applied. The method of claim 13,
The data communication unit transmits the duplicate packet to a secondary base station different from the base station, so that the secondary base station transmits the duplicate packet to the terminal using the additional frequency band.
Transmitter to which the control method for enabling packet redundancy is applied. The method of claim 7, wherein
The receiving device is a mobile communication base station, and the transmitting device is a mobile communication terminal existing within the coverage of the mobile communication base station,
The data communication unit receives information on whether to activate the packet redundant transmission mode determined by the base station from the base station,
The controller determines whether to activate the packet redundant transmission mode based on information on whether to activate the packet redundant transmission mode.
Transmitter to which the control method for enabling packet redundancy is applied.

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