KR102143559B1 - Method for selecting frequency band for redundant packet transmission and mobile communication device applying same - Google Patents

Abstract

A method of selecting a frequency band performed by a transmitting device for transmitting data to a receiving device through a wireless channel according to an embodiment of the present invention includes a fundamental frequency that is one of a plurality of frequency bands for transmitting data through the wireless channel. Transmitting a data packet to the receiving device using a band, when a packet redundant transmission mode is activated, based on at least one of a data transmission environment and a preset priority of each of the plurality of frequency bands, the plurality of Selecting one or more additional frequency bands different from the base frequency band among frequency bands, and transmitting a duplicate packet generated by duplicating the data packet to the receiving device using the additional frequency band. .

Description

Frequency band selection method for packet redundant transmission, and mobile communication device to which the method is applied {METHOD FOR SELECTING FREQUENCY BAND FOR REDUNDANT PACKET TRANSMISSION AND MOBILE COMMUNICATION DEVICE APPLYING SAME}

The present invention relates to a method of operating a packet redundant transmission technology for improving service reliability and minimizing delay in providing a mobile communication service, and to a mobile communication device to which the method is applied.

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

Recently, it is possible to simultaneously transmit data through a plurality of different frequency bands using carrier aggregation (CA), a technology that configures one broadband by aggregating a plurality of component carriers (CC). Do. In addition, in the latest mobile communication standards such as a 5-generation (5G) new radio (NR) system, an ultra-reliable and low latency (URLLC) service is being discussed to ensure such high reliability and ultra-low latency conditions.

This latest trend can be said to reflect efforts to provide users with higher-quality mobile communication services as described above. In particular, the 5G NR system requires a very short delay time of 10 ms (based on end-to-end latency) as one of the performance requirements. In order to achieve such a high level of requirements, it is necessary to propose a new mobile communication technique that enables high-speed data transmission with a lower error rate.

Korean Patent Application Publication No. 10-2015-0009456 (published on January 26, 2015)

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

However, the problem to be solved by the present invention is not limited to the ones mentioned above, and another problem to be solved that is not mentioned can be clearly understood by those of ordinary skill in the art from the following description. will be.

A method of selecting a frequency band performed by a transmitting device for transmitting data to a receiving device through a wireless channel according to an embodiment of the present invention includes a fundamental frequency that is one of a plurality of frequency bands for transmitting data through the wireless channel. Transmitting a data packet to the receiving device using a band, when a packet redundant transmission mode is activated, based on at least one of a data transmission environment and a preset priority of each of the plurality of frequency bands, the plurality of Selecting one or more additional frequency bands different from the base frequency band among frequency bands, and transmitting a duplicate packet generated by duplicating the data packet to the receiving device using the additional frequency band. .

According to an embodiment of the present invention, a transmission device to which a frequency band selection method for transmitting data to a reception device through a wireless channel is applied, a basic frequency band that is one of a plurality of frequency bands for data transmission through the wireless channel. When the data packet is transmitted to the receiving device and the packet redundant transmission mode is activated, the data packet is duplicated using an additional frequency band different from the basic frequency band among the plurality of frequency bands. When the data communication unit for transmitting a duplicate packet to the receiving device and the packet redundant transmission mode are activated, among the plurality of frequency bands, based on at least one of a data transmission environment and a preset priority of each of the plurality of frequency bands. It may include a control unit for selecting the additional frequency band.

According to an embodiment of the present invention, data packets are duplicated and transmitted through a packet redundant transmission mode, but an additional frequency band for transmitting a duplicate packet of the original data packet transmitted through the basic frequency band is related to the state of the radio channel. It can be selected by considering various factors. As a result, it becomes possible to use radio resources more efficiently, provide high-reliability and ultra-low-latency services required by the latest mobile communication standards to users, and ultimately improve the experience satisfaction of users who use 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 in which 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 transmission apparatus to which a frequency band selection method for redundant packet transmission according to an embodiment of the present invention is applied.
4 is a diagram illustrating each step of a method for selecting a frequency band for redundant packet transmission according to an embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims.

In describing embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to the intention or custom of subscribers or operators. Therefore, the definition should be made based on the contents throughout this 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 transmitting device 100 and a receiving device 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 the transmitting device 100, and a user entity (UE) existing in the coverage of the base station is the receiving device 200 However, in uplink (UL) data transmission, the terminal may be the transmitting device 100 and the base station 200 may be the receiving device.

The transmission device 100 includes packet data convergence protocol (PDCP) 101, radio link control (RLC) 102, 103, medium access control (MAC) 104, and a physical, physical (PHY) for data transmission to the reception device 200. 105, 106) and the like may include various layers. The transmission device 100 may transmit a data packet to the reception device 200 by using a plurality of frequency bands by carrier aggregation. Since detailed matters related to each of the hierarchical structures and functions are already known, detailed descriptions are omitted herein.

As mentioned at the outset, the latest mobile communication standards such as 5G NR standards are required to satisfy strict high reliability and ultra-low latency conditions. Accordingly, in an embodiment of the present invention, in a multi-connection (MC) situation in which a plurality of bands can be used, such as dual connectivity (DC) or carrier aggregation, a fundamental frequency band among the plurality of frequency bands ( The same duplicated packet as the data packet transmitted using the primary cell or Pcell, frequency band #1 in FIG. 1 is an additional frequency band (secondary cell or Scell, in FIG. 1) different from the fundamental frequency band among the plurality of frequency bands. Introducing a packet duplication transmission mode, which is repeatedly transmitted using band #2), but considering various factors related to the state of the radio channel 300, an appropriate additional frequency band is selected from among a plurality of predetermined frequency bands. You can choose.

Accordingly, the data packet transmitted using the basic frequency band may be sequentially transmitted to the receiving device 200 through the PDCP 101, the basic RLC 102, the MAC 104, and the first PHY 105. . The duplicate packet transmitted using the additional frequency band may be transmitted to the receiving device 200 through the PDCP 101, the additional RLC 103, the MAC 104, and the second PHY 105 in sequence. The receiving device 200 may alternately or simultaneously receive the data packet and the duplicate packet, and when the two packets substantially identical to each other are received together, the duplicated duplicate packet may be discarded.

Since the duplicate packet may have the same sequence number (SN) as the original data packet, the receiving device 200 receives the original data packet if the duplicate packet is normally received even when the original data packet is not normally received. And can continue to receive data packets of the next number without problem. Therefore, according to the configuration of the present invention, it is possible to increase reliability by preventing packets from being lost due to poor conditions of the wireless channel 300, and to prevent delay due to packet retransmission using the same band. It can more easily satisfy the requirements of the communication standard.

However, when the packet redundant transmission mode is applied as described above, a method of selecting an additional frequency band may be an important problem. Among a plurality of predetermined frequency bands, frequency bands other than the generally predetermined fundamental frequency band are the targets of the selection.Since each of these frequency bands are in different data transmission environments, some of these are additional frequency bands. The performance of the mobile communication service provided by the mobile communication system 10 may vary depending on whether it is selected.

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

The terminal 40 can basically perform data communication through the master base station 20, but in some cases, the master base station 20 passes through the secondary base station 30 some of the data exchanged with the terminal 40. Can be done. When the embodiment of the present invention is applied to such a dual access system, the master base station 20 provides a basic frequency band (frequency band #1 310 in FIG. 2), and the secondary base station 30 provides an additional frequency band (in FIG. 2). Frequency band #2 (320) can be used respectively.

Accordingly, the master base station 20 generates a duplicate packet while the packet redundancy transmission mode is activated, and transmits the original data packet directly to the terminal 40, and transmits the duplicate packet to the secondary base station 30. (30) can be transmitted to the terminal 40. Of course, in this case, the configuration for transmitting data through an additional frequency band among the configurations of the transmission device 100 of FIG. 1 may be located in the secondary base station 30 instead of the master base station 20, and for this purpose, the MAC 104 ) Layers are also divided into two and may be located in the master base station 20 and the secondary base station 30, respectively.

3 is a diagram illustrating a configuration of a transmission apparatus to which a frequency band selection method for redundant packet transmission according to an embodiment of the present invention is applied. The transmission 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 transmission device 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, the operation of each component of the transmission device 100 will be described with reference to FIG. 3, and a more detailed operation will be described in detail with reference to FIG. 4.

When the packet redundancy transmission mode is activated, the state determination unit 110 may collect information on the state of the wireless channel 300 to select an additional frequency band to be used for transmission of a duplicate packet. That is, the information may be information on a data transmission environment using the wireless channel 300, and a detailed example will be described later. And the state determination unit 110 based on the information on the state of the radio channel 300, a selection criterion value, which is an index indicating a data transmission environment, for each of a plurality of predetermined frequency bands (or the plurality of frequency bands) Can be calculated for each band other than the already determined fundamental frequency band). Such a selection criterion value may be used by the control unit 120 to be described later to select an additional frequency band from among the plurality of frequency bands. The state determination unit 110 may be implemented by including a computing device such as a microprocessor, and for this, the control unit 120 is also the same.

When the packet redundancy transmission mode is activated, the controller 120 may select an additional frequency band to be used for transmission of a duplicate packet from among the plurality of predetermined frequency bands. The controller 120 may preferably select one additional frequency band, but in some cases, it may also be possible to select a plurality of frequency bands. The selection of the additional frequency band may be performed based on a data transmission environment of each of a plurality of frequency bands or a preset priority. In addition, when the packet redundancy transmission mode is activated, the controller 120 creates a duplicate packet by duplicating the original data packet to be transmitted through the basic frequency band, and the generated duplicate packet is transmitted through the data communication unit 130 to the receiving device. It can be sent to 200.

The data communication unit 130 may transmit data to the reception device 200 under the control of the controller 120, and in some cases, may receive necessary data from the reception device 200. When the packet redundant transmission mode is not activated, the data communication unit 130 may transmit a data packet to the reception device 200 using only the basic frequency band. In contrast, when the packet redundant transmission mode is activated, the data communication unit 130 may additionally transmit a duplicate packet identical to the data packet to the reception device 200 using an additional frequency band. The data communication unit 130 may include a data bus for transmission and reception of data, or a wired/wireless communication module.

4 is a diagram illustrating each step of a method for selecting a frequency band for redundant packet transmission according to an embodiment of the present invention. However, since the method illustrated 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 illustrated in FIG. 4 is a diagram and a sequence thereof. Of course, it can be performed differently. In addition, descriptions of the overlapping bars with FIGS. 1 to 3 may be omitted.

First, the controller 120 may determine whether the packet redundant transmission mode is activated (S110). When the packet redundant transmission mode is not activated, the control unit 120 controls the data communication unit 130 so that only the original data packet is transmitted to the receiving device 200 using the basic frequency band. Unlike this, the operation when the redundant packet transmission mode is activated will be described in detail below.

First, the state determination unit 110 may collect information on a data transmission environment through the wireless channel 300 (S120). In terms of practical implementation, the PDCP 101 performing packet replication may collect information from the lower layers RLCs 102 and 103, MAC 104 and PHYs 105 and 106. Each layer of the RLC (102, 103), MAC (104) and PHY (105, 106) can directly transmit information to the PDCP (101) layer, and at this time, the control signal paths ① to ③ of FIG. An interface can be used. Alternatively, one of the layers may collect information from another layer and transmit the information to the PDCP 101 layer. In this case, interfaces ④ to ⑥ of the control signal paths of FIG. 1 may be used.

Based on the information, the state determination unit 110 may obtain a selection criterion value, which is an index indicating the data transmission environment of the wireless channel 300, for each of the frequency bands. However, the fundamental frequency band may be excluded from the calculation target of the selection criterion. In addition, the state determination unit 110 may obtain a selection criterion only for a candidate frequency band having a signal quality of a certain level or higher among the frequency bands excluding the fundamental frequency band. For this operation, the controller 120 may obtain a result of measuring the quality of a signal transmitted through the wireless channel 300 for each of the plurality of frequency bands, and the quality of the signal is a predetermined reference quality. The above frequency band may be set as a candidate frequency band.

When the packet redundancy transmission mode is activated, the controller 120 may select an additional frequency band other than the basic frequency band from among the plurality of frequency bands (S130). Such selection may be made based on at least one of a data transmission environment of each of the plurality of frequency bands, which is quantified by the selection criterion, and a preset priority order for each of the plurality of frequency bands. In terms of practical implementation, the selection may be made in the PDCP 101 layer of FIG. 1, and the generation of the duplicate packet may also be made in the PDCP 101 layer. The embodiment made is not excluded.

Hereinafter, the selection operation of the control unit 120 will be described in more detail. The controller 120 may select the additional frequency bands in the order of the highest priority, and this may be referred to as a selection method according to a previously designated one. Alternatively, the control unit 120 may select an additional frequency band in the order of the highest selection criterion, which may be referred to as a method for selecting a best carrier having an optimal transmission environment.

In some cases, a hybrid selection using both the priority and the selection criterion may be performed, and in this case, the priority may have priority over the selection criterion. Accordingly, the controller 120 selects the additional frequency bands in the order of higher priority, but if the priority is the same, the control unit 120 may preferentially select a frequency band having an excellent data transmission environment, that is, a high selection criterion.

When the additional frequency band is selected as described above, the original data packet and the duplicate packet may be transmitted from the transmission device 100 to the reception device 200. Specifically, the data communication unit 130 may transmit the original data packet using the basic frequency band (S140). In addition, the data communication unit 130 may transmit a duplicate packet of the original data packet generated (S150) by the control unit 120 using an additional frequency band. In terms of practical implementation, the duplicate packet may be generated in the PDCP 101 layer of FIG. 1.

According to an embodiment of the present invention, the base station may be a subject of selection of an additional frequency band in both uplink (UL) transmission and downlink (DL) transmission, but the terminal in principle It can only be the subject of additional frequency band selection. Hereinafter, based on this point, the process of calculating the selection reference value will be described in more detail.

First, the controller 120 may obtain a result of measuring the quality of a signal transmitted through the wireless channel 300 for each of the plurality of frequency bands. When the transmitting device 100 is a base station, the base station measures the result of inter-frequency measurement performed by the UE in a radio resource control (RRC) reconfiguration procedure through a measurement report (MR) message. It can be reported from the terminal, and the quality of the signal can be obtained based on signal quality measurement information such as reference signal received power (RSRP) or reference signal received quality (RSRQ) extracted from the message. On the other hand, when the transmitting device 100 is a terminal, the signal quality may be obtained directly from the result of the inter-cell measurement performed by itself. In this case, the quality of the signal can be used in the case of uplink transmission due to the signal quality in downlink transmission or channel reciprocity.

The controller 120 may designate a frequency band in which the signal quality is equal to or higher than a predetermined reference quality as a candidate frequency band. Then, the state determination unit 130 may calculate a selection reference value for each of the candidate frequency bands. The selection criterion value may be calculated to have a value that is inversely proportional to at least one of a radio resource utilization rate for each frequency band, a scheduling delay rate, and the number of users using the packet redundant transmission mode.

More specifically, the selection criterion value includes a first metric proportional to the radio resource utilization rate, a second metric proportional to the scheduling delay rate, and a third metric proportional to the number of users, a predetermined weight set for each metric. It can be calculated to be inversely proportional to the weighted average value based on. In this case, the predetermined weight may be determined according to a policy of the operator of the mobile communication system 10, and may preferably be determined as a real number of 0 or more and 1 or less. If there is a metric to be excluded from the calculation of the selection criterion among the metrics, the weight for the metric may be set to 0.

First, the first metric will be described. When the base station selects an additional frequency for downlink transmission, the value of the first metric may be calculated by a downlink physical resource block (PRB) utilization rate calculated by a cumulative average method for a predetermined time. An example of the cumulative average method may be a method such as infinite impulse response filtering (IIR) and a moving window.

When the base station selects an additional frequency for uplink transmission, the uplink PRB utilization rate may be used instead of the downlink PRB utilization rate. In addition, even when the terminal selects an additional frequency for uplink transmission, the uplink PRB utilization rate may be used to calculate the first metric. However, in this case, the terminal may receive information on the radio resource utilization rate, such as the uplink PRB utilization rate, from the base station through the data communication unit 130 via a separate interface, and the scheduling delay rate and the second metric for calculating the second metric. 3 Information on the number of users for metric calculation may also be provided. However, when information for calculating a specific metric cannot be provided from the base station due to the absence of the separate interface, the weight of the information not provided may be set to 0.

When the base station selects an additional frequency for downlink transmission, the value of the second metric may be determined based on a weighted average of the simultaneous access rate and the downlink data access rate by a predetermined weight. Here, the simultaneous access rate may be a value obtained by dividing the number of simultaneous accesses (the number of terminals simultaneously accessing the base station based on a certain point in time or time) by the maximum number of accessors determined according to the performance of the base station. In addition, the downlink data access rate may be a value obtained by dividing the number of accessors having downlink data (eg, accessors who have received downlink data within the time period) by the maximum number of accessors based on a predetermined time period.

Meanwhile, when the base station or the terminal selects an additional frequency for uplink transmission, the uplink data access rate may be used instead of the downlink data access rate in the above description. The uplink data access rate may be a value obtained by dividing the number of accessors having uplink data by the maximum number of accessors based on a specific time period.

The value of the third metric is, when the base station selects an additional frequency for downlink transmission, the URLLC service user (e.g., using a packet redundant transmission mode) calculated by the cumulative average method for downlink transmission over a certain period of time. It can be calculated in proportion to the number of terminals) divided by the maximum number of users. In contrast, when the base station or the terminal selects an additional frequency for uplink transmission, the number of URLLC service users calculated by the cumulative average method over a certain period of time for uplink transmission is calculated in proportion to the value divided by the maximum number of users. Can be.

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

Combinations of each block in the block diagram attached to the present invention and each step in the flowchart may be performed by computer program instructions. Since these computer program instructions can be mounted on the encoding processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, the instructions executed by the encoding processor of the computer or other programmable data processing equipment are each block of the block diagram or Each step in the flow chart creates a means to perform the functions described. These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory It is also possible for the instructions stored in the block diagram to produce an article of manufacture containing instruction means for performing the functions described in each block of the block diagram or each step of the flowchart. Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operational steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. It is also possible for the instructions to perform the processing equipment to provide steps for performing the functions described in each block of the block diagram and each step of the flowchart.

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

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential quality of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, 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 within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

According to an embodiment of the present invention, it is possible to use radio resources more efficiently, and to provide a high-reliability and ultra-low-latency service required by the latest mobile communication standards to a user, and ultimately, a mobile communication service. Satisfaction level of the user's experience 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 (20)

◈ Claim 1 was abandoned upon payment of the set registration fee. A method performed by a transmitting device for transmitting data to a receiving device over a wireless channel, comprising:
Transmitting a data packet to the receiving device by using a fundamental frequency band, which is one of a plurality of frequency bands for data transmission through the radio channel;
When the packet redundancy transmission mode is activated, selecting one or more additional frequency bands different from the fundamental frequency band from among the plurality of frequency bands based on data transmission environments of each of the plurality of frequency bands; And
And transmitting a duplicate packet generated by duplicating the data packet to the receiving device using the additional frequency band
Frequency band selection method for packet redundant transmission. ◈ Claim 2 was abandoned upon payment of the set registration fee. The method of claim 1,
The duplicate packet has the same serial number (SN) as the data packet
Frequency band selection method for packet redundant transmission. delete ◈ Claim 4 was abandoned upon payment of the set registration fee. The method of claim 1,
The selecting may include obtaining a result of measuring the quality of a signal transmitted through the radio channel for each of the plurality of frequency bands, and at least one of the plurality of frequency bands having a quality of the signal equal to or greater than a predetermined reference quality Selecting a candidate frequency band of as the additional frequency band
Frequency band selection method for packet redundant transmission. ◈ Claim 5 was abandoned upon payment of the set registration fee. The method of claim 4,
The step of selecting,
Calculating a selection criterion value, which is an index indicating the data transmission environment, for each of the at least one candidate frequency band; And
And selecting as the additional frequency band from one of the at least one candidate frequency band having a high selection criterion value,
The selection criterion value is calculated to have a value that is inversely proportional to at least one of a radio resource utilization rate, a scheduling delay rate, and the number of users using the packet redundant transmission mode of the at least one candidate frequency band to be calculated for the selection criterion value.
Frequency band selection method for packet redundant transmission. ◈ Claim 6 was abandoned upon payment of the set registration fee. The method of claim 5,
The selection criterion value is calculated to be inversely proportional to a weighted average value of a first metric proportional to the radio resource utilization rate, a second metric proportional to the scheduling delay rate, and a third metric proportional to the number of users based on a predetermined weight. felled
Frequency band selection method for packet redundant transmission. A transmitting device for transmitting data to a receiving device through a wireless channel,
When a data packet is transmitted to the receiving device using a fundamental frequency band, which is one of a plurality of frequency bands for data transmission through the radio channel, and the packet redundant transmission mode is activated, the basic frequency band among the plurality of frequency bands A data communication unit for transmitting a duplicate packet generated by duplicating the data packet to the receiving device using an additional frequency band different from the frequency band; And
When the packet redundancy transmission mode is activated, based on the data transmission environment of each of the plurality of frequency bands, comprising a control unit for selecting the additional frequency band of the plurality of frequency bands
A transmitting device to which a frequency band selection method for redundant packet transmission is applied. The method of claim 7,
The duplicate packet has the same serial number as the data packet
A transmitting device to which a frequency band selection method for redundant packet transmission is applied. delete The method of claim 7,
The control unit obtains a result of measuring the quality of the signal transmitted through the radio channel for each of the plurality of frequency bands, and at least one candidate whose quality of the signal is equal to or greater than a predetermined reference quality among the plurality of frequency bands Selecting a frequency band as the additional frequency band
A transmitting device to which a frequency band selection method for redundant packet transmission is applied. The method of claim 10,
The transmission device further includes a state determination unit for calculating a selection reference value, which is an index indicating the data transmission environment, for each of the at least one candidate frequency band,
The control unit selects as the additional frequency band from one of the at least one candidate frequency band from which the selection criterion value is high,
The selection criterion value is calculated to have a value that is inversely proportional to at least one of a radio resource utilization rate, a scheduling delay rate, and the number of users using the packet redundant transmission mode of the at least one candidate frequency band to be calculated for the selection criterion value.
A transmitting device to which a frequency band selection method for redundant packet transmission is applied. The method of claim 11,
The state determination unit, based on a predetermined weight, a weighted average of the selection criterion value, a first metric proportional to the radio resource utilization rate, a second metric proportional to the scheduling delay rate, and a third metric proportional to the number of users. Calculated to be inversely proportional to the value
A transmitting device to which a frequency band selection method for redundant packet transmission is applied. The method of claim 10,
The transmitting device is a mobile communication base station, and the receiving device is a mobile communication terminal existing within the coverage of the mobile communication base station,
The signal quality is calculated based on signal quality measurement information included in a measurement report (MR) message reported by the terminal to the base station for the radio channel.
A transmitting device to which a frequency band selection method for redundant packet transmission is applied. The method of claim 10,
The receiving device is a mobile communication base station, the transmitting device is a mobile communication terminal existing within the coverage of the mobile communication base station,
The control unit is configured to determine whether to activate the packet redundant transmission mode based on information on a radio resource utilization rate, a scheduling delay rate, and a number of users received from the base station by the data communication unit
A transmitting device to which a frequency band selection method for redundant packet transmission is applied. The method of claim 7,
The transmitting device is a mobile communication base station, and the receiving device is a mobile communication terminal existing within the coverage of the mobile communication base station,
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.
A transmitting device to which a frequency band selection method for redundant packet transmission is applied. The method of claim 7,
The receiving device is a mobile communication base station, the transmitting device is a mobile communication terminal existing within the coverage of the mobile communication base station,
The data communication unit transmits a measurement report message for the radio channel to the base station, and receives an instruction regarding the selection of the additional frequency band from the base station receiving the measurement report message,
The control unit is configured to select the additional frequency band based on the instruction regarding the selection of the additional frequency band.
A transmitting device to which a frequency band selection method for redundant packet transmission is applied. ◈ Claim 17 was abandoned upon payment of the set registration fee. The method of claim 1,
The step of selecting,
Selecting the one or more additional frequency bands further based on a preset priority
Frequency band selection method for packet redundant transmission. ◈ Claim 18 was abandoned upon payment of the set registration fee. The method of claim 17,
The selecting step includes selecting the additional frequency band in the order of the highest priority, and selecting a frequency band having the best data transmission environment when the priority is the same.
Frequency band selection method for packet redundant transmission. The method of claim 7,
The controller further selects the additional frequency band from among the plurality of frequency bands based on a preset priority.
A transmitting device to which a frequency band selection method for redundant packet transmission is applied. The method of claim 19,
The control unit selects the additional frequency band in the order of the highest priority, but if the priority is the same, selects a frequency band having the best data transmission environment.
A transmitting device to which a frequency band selection method for redundant packet transmission is applied.

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