KOREAN INTELLECTUAL PROPERTY OFFICE
`[stamp: CERTIFIED COPY OF PRIORITY DOCUMENT]
`
`I hereby certify that the attached copy is true to the original copy of the below application.
`
`Application Number:
`
`Patent application 2001 No. 41363
`PATENT-2001-0041363
`
`Date of Application:
`
`July 10, 2001
`
`Applicant(s):
`
`LG ELECTRONICS INC.
`
`February 9, 2002
`
`Commissioner of the Korean Intellectual Property Office
`COMMISSIONER
`[seal: Commissioner of the Korean Intellectual Property Office]
`
`Ex. 1013 - Sierra Wireless, Inc.
`Sierra Wireless, Inc., et al. v. Sisvel S.P.A., IPR2021-01141
`Page 1 of 14
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`[Name of document]
`[Category of rights]
`[Recipient]
`[Reference number]
`[Date of submission]
`[International patent classification]
`[Title of the invention]
`[Title of the invention in English]
`[Applicant]
` [Name]
` [Applicant code]
`[Agent]
` [Name]
` [Agent code]
` [Registration No. for general power of
`attorney]
`[Agent]
` [Name]
` [Agent code]
` [Registration No. for general power of
`attorney]
`[Inventor]
` [Name]
` [Name in English]
` [Resident registration No.]
` [Postal code]
` [Address]
`
` [Nationality]
`[Inventor]
` [Name]
` [Name in English]
` [Resident registration No.]
` [Postal code]
`
`
`
`
`
`[Bibliographic matters]
`Patent application form
`Patent
`Commissioner of the Korean Intellectual Property Office
`0010
`July 10, 2001
`H04B
`Data transmission rate control method in a reverse link
`The data rate control method on the reverse link
`
`LG Electronics Inc.
`1-1998-000275-8
`
`KIM, Yong-In
`9-1998-000022-1
`2000-005155-0
`
`SHIM, Chang-Seob
`9-1998-000279-9
`2000-005154-2
`
`
`KIM, Ki-Jun
`KIM, Ki Jun
`680704-1405717
`137-070
`101-1202, 1533 Seocho Hanshin Apartments, Seocho-dong,
`Seocho-gu, Seoul
`KR
`
`KIM, Young Cho
`KIM, Young Cho
`730803-1047822
`138-170
`
`Ex. 1013 - Sierra Wireless, Inc.
`Sierra Wireless, Inc., et al. v. Sisvel S.P.A., IPR2021-01141
`Page 2 of 14
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` [Address]
`
` [Nationality]
`[Purpose]
`
`[Fees]
` [Basic application fee]
` [Additional application fee]
` [Priority claim fee]
` [Examination request fee]
` [Total]
`[Attached documents]
`
`
`
`
`
`#1302 Gyeongnam Lake Park, 32-1 Songpa-dong, Songpa-gu,
`Seoul
`KR
`I hereby apply as described above according to Article 42 of
`the Patent Act. Agent
`KIM, Yong-in (seal) Agent
`SHIM, Chang-Seob (seal)
`
`29,000 won
`page(s)
`16
` 0
`won
`page(s)
`0
` 0
`won
`case(s)
`
`0
`claims(s) 0
`won
`0
`29,000 won
`1. Abstract and Specification (figures)_1 copy
`
`Ex. 1013 - Sierra Wireless, Inc.
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`[Abstract]
`
`[Abstract]
`The present invention pertains to a mobile communication system, and specifically pertains to a
`data transmission rate control method in a reverse link. Such a data transfer rate control method in a reverse
`link, according to the present invention comprises: a step of calculating total interference amount of a signal
`that is received from one or more terminals; a step of finding a data transmission control threshold according
`to the total interference amount; a step of calculating transmission status value by receiving reception pilot
`strength and a reverse data transmission rate from the terminal; and a step of generating a reverse data
`transmission rate command by comparing the transmission status value and the data transmission control
`threshold, and transmitting it to each of the terminals.
`[Representative Figure]
`
`Fig. 2
`[Keywords]
`Reverse link, base station threshold value (thershold_bs)
`
`
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`[Specification]
`
`[Title of the Invention]
`Data transmission rate control method in a reverse link {The data rate control method on the reverse
`
`link}
`[Brief Description of fFigures]
`Fig. 1 is a figure describing the conventional data transmission rate control in a reverse link.
`Fig. 2 is a figure describing a data transmission rate control in a reverse link according to the present
`invention.
`Fig. 3 is a figure showing a renewal relationship of a data transmission control threshold
`(threshold_bs) of a base station according to total interference amount according to Fig. 2.
`Fig. 4 is a figure showing a comparative relationship between a data transmission control threshold
`(threshold_bs) of a base station and transmission status value (rate_value) according to Fig 2.
`*Description of reference numerals for major parts of figures*
`10: Base station
`
`
`
`20: Terminal
`
`[Detailed Description of the Invention]
`[Object of the Invention]
`[Technical Field to which the Invention Pertains and Prior Art in the Field]
`<7>
`The present invention pertains to a mobile communication system, and specifically pertains to a
`data transmission rate control method in a reverse link.
`<8> Generally, reverse data transmission is closely related to the total amount of interference received
`at a base station.
`<9>
`If the total amount of interference received at the base station is low, the transmission can be
`performed by increasing a reverse data transmission rate, but if the total interference amount is above a
`certain level, there are cases where a terminal must reduce a data transmission rate or discontinue data
`transmission.
`<10> In a 1xEV-DO system, a base station creates a data transmission rate increase or decrease command,
`in other words, a transmission rate command (RA: Reverse Activity) by estimating the total amount of
`interference in the reverse direction.
`<11> The RA command is communicated to all users transmitting data in the reverse direction through
`a common channel referred to as an “RA channel.”
`<12> Also, if the total among of interference received from the base station is large, in other words, if it
`is below a certain threshold, a data transmission rate decrease command is communicated, and if the total
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`interference amount is small, in other words, if it is below a certain threshold, a data transmission rate
`increase command is communicated.
`<13> However, an RA command currently used is created based only on total interference amount
`received at a base station without considering the reception status of each user, and therefore an RA
`command is communicated by the same command to all users.
`<14> The RA command is transmitted from the base station to the terminal during one frame, and adjusts
`the data transmission rate of a next frame.
`<15>
`If a terminal receives an RA command, terminals perform a test to increase or decrease the
`transmission rate.
`<16>
`In other words, increasing or decreasing the data transmission rate is not mandatory when terminals
`receive an increase or decrease command.
`<17> Terminals, after receiving a command, independently test whether to implement or not implement
`an increase or decrease.
`<18> An increase or decrease is executed only if this test is passed, and if this test is not passed, an
`increase or decrease is not executed, and the current data transmission rate is maintained.
`<19> The test uses an operating principle to ensure that if a terminal has a low data transmission rate
`being transmitted in a reverse direction to the current frame, there is a high probability of the data
`transmission rate of a next frame increasing, and a low probability of the data transmission rate decreasing;
`conversely, if the data transmission rate of a current frame is high, there is a high probability of the data
`transmission rate in the next frame decreasing, and a low probability of a data transmission rate increasing.
`<20> For example, we will assume there are five types of transmission rates, 9600 bps, 19200 bps, 38400
`bps, 76800 bps, and 153600 bps, and terminal A is currently transmitting data at 19200 bps in a current
`frame, and terminal B is servicing at 76800 bps.
`<21> At such time, if a base station communicates an increase command to the terminals, terminal A is
`operated in a manner in that the probability of a transmission rate increasing is higher than terminal B in a
`next frame, and if a base station communicates a decrease command to terminals, terminal B is operated in
`a manner that probability of a transmission rate decreasing is higher than terminal A.
`<22> Fig. 1 is a figure showing the conventional data transmission rate control in a reverse link.
`<23> Referring to Fig. 1, total interference amount is calculated by using reception power of one or more
`terminals in a cell range of a base station (1) (S1).
`<24> A reverse data transmission rate command (RA: Reverse Activity) is generated by comparing the
`calculated total interference amount and the base station threshold value (S2).
`<25> The generated reverse data transmission rate command is transmitted to a terminal (2) (S3).
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`<26> A terminal (2) that has received the reverse data transmission rate command performs a data
`transmission rate adjustment test (S4).
`<27>
`It adjusts reverse data transmission rate (S5) after the test (S4).
`<28> The reverse data transmission rate command (RA: Reverse Activity) as described above is created
`based only on total interference amount received at a base station, for the reception status of each user
`terminal, and therefore the transmission rate command (RA) is communicated by the same increase or
`decrease command to all users.
`<29>
`In addition, even after receiving an increase or decrease command, after an independent test is
`executed, an increase or decrease is executed.
`<30>
`In this manner, the conventional reverse data transmission rate control must execute an increase or
`decrease of the data transmission rate in a state of not at all considering channel circumstances or the data
`transmission rate of its user terminal, and therefore a drawback of inefficient data transmission arises, and
`this inefficient data transfer soon leads to decline of throughput.
`<31>
`In addition, a base station changes the transmission rate after a terminal independently performs a
`test, and therefore there is a disadvantage that the effect of changing the total amount of interference as
`predicted by the base station cannot be achieved.
`[Technical Problem to be Resolved by the Invention]
`<32> Therefore, the present invention was devised by considering the problems of conventional art
`mentioned above, and the purpose of the present invention is to provide a data transmission rate control
`method in a reverse link for increasing throughput by using the channel situation of each terminal and the
`total amount of interference in a reverse link that is received at a base station, and the data transmission rate
`that is currently being transmitted.
`<33> According to one characteristic of the present invention, for achieving such purpose, it comprises:
`a step of calculating the total amount of interference of a signal received from one or more terminals; a step
`of finding a data transmission control threshold value according to the total interference amount; a step of
`calculating transmission status value by receiving reception pilot strength and a reverse data transmission
`rate from the terminal; and a step of generating a reverse data transmission rate command by comparing
`the transmission status value and the data transmission control threshold value and transmitting it to each
`of the terminals.
`<34> Preferably, the base station transmission control threshold value maintains the threshold value if
`the total interference amount is within an established range, and if the total interference amount is less than
`or equal to an established range, increases the threshold value by a certain value, and if the total interference
`amount is larger than or equal to an established range, decreases the threshold value by a certain value.
`
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`<35>
`In addition, for the comparison between the reception pilot strength, transmission status value
`corresponding to a reverse data transmission rate, and a base station data transmission control threshold
`value, if the transmission status value is higher than a data transmission control threshold value of a base
`station, decrease rate bits are generated, and if the transmission status value is smaller than two or more
`times the base station data transmission control threshold value, increase rate bits are generated, and in
`other cases excluding the decrease rate bits and increase rate bits, current data transmission maintain rate
`bits are generated.
`<36> According to another characteristic of the present invention for achieving such purpose, it
`comprises: a step of calculating total amount of interference that is received at a base station; a step of
`receiving reception pilot strength and a reverse data transmission rate from a terminal; and a step of
`generating a reverse data transmission rate command by using the total interference amount, the reception
`pilot strength, and the reverse data transmission rate, and transmitting it to a terminal.
`[Configuration and Application of the Invention]
`<37> Below, configuration and application according to a preferred embodiment of the present invention
`will be explained by referring to the attached figures.
`<38> Fig. 2 is a figure describing a data transmission rate control in a reverse link according to the present
`invention.
`<39> A base station (10) transmits a pilot signal to a terminal (20) (S10).
`<40> Then, total interference amount of a reverse link is calculated through the reception signal (power)
`of one or more terminals in a cell range of the base station (10) (S20).
`<41> A base station (10) that has calculated total interference amount of the reverse link updates a base
`station data transmission control threshold value (threshold_bs) by using the total interference amount (S30).
`<42> Update of a base station data transmission control threshold (threshold_bs) by using the total
`interference amount will be explained with reference to Fig. 3.
`<43> Referring to Fig. 3, the base station data transmission control threshold value (threshold_bs) is
`updated by three methods according to the total interference amount of a reverse link.
`<44> First, if the measured total interference amount is smaller than or equal to an established range, in
`other words, if it is lower than or equal to a certain level, a base station data transmission control threshold
`value (threshold_bs) increases by a certain value, and if the total interference amount is larger than or equal
`to an established range, in other words, if it is higher than or equal to a certain level, it is renewed so that
`the base station data transmission control threshold (threshold_bs) is decreased by a certain value.
`<45>
`In addition, if deemed that the measured total interference amount is within an established range,
`which is a suitable level, the base station data transmission control threshold value is maintained as is.
`
`
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`<46> Therefore, as shown in Fig. 2, if the total interference amount is less than or equal to a first threshold
`value, the base station threshold value (thershold_bs) is increased by Dup, and if the total interference
`amount is more than or equal to a second threshold value, the base station threshold value (threshold_bs) is
`decreased by Ddown.
`<47>
`In addition, if the total interference amount is between the first threshold value and second threshold
`value, there is no change to the base station data transmission control threshold value (threshold_bs).
`<48>
`In addition, the terminal (20) transmits pilot strength and a reverse data transmission rate received
`from the base station (10) to the base station (10) (S40).
`<49> Next, a base station (10) that has received reception pilot strength and a reverse data transmission
`rate received from the terminal (20) calculates a transmission status value (rate_value) that corresponds to
`the reception pilot strength and a reverse data transmission rate (S50).
`<50> Here, the terminal (20) regularly reports strength of a pilot, which it receives by a reverse link, to
`a base station (10).
`<51>
`In addition, a data transmission rate that is transmitted in reverse is reported in units of every frame,
`and the pilot strength is not actually a value that suddenly changes every moment, and therefore no major
`issue arises even if not reported in units of every frame, but an average value of pilot strength received
`during a certain time is generally used, for obtaining statistically accurate channel circumstances.
`<52> For transmission status value (rate_value) calculation, the base station (10) uses the average value (P)
`of the reception pilot strength and the reverse data transmission rate (R), which are two types of information
`received from the terminal (20). The equation is:
`<53>
`
`<54>
`In the equation above, Ri and Pi show average value of a data transmission rate and reception pilot
`<55>
`power of each Ith terminal of one or more terminals, and for reference, “N” is the total number of terminals
`transmitting reverse link data in the base station (10).
`<56> The rate_valuei is a combination of channel circumstances of an Ith terminal and a data transmission
`rate that is currently being transmitted via a reverse link, into one value.
`<57>
`If channel status of an Ith terminal is poor, the Pi value of the terminal (20) becomes smaller, and
`accordingly the value of rate_valuei increases.
`<58>
`In other words, the poorer channel status is, or the higher the data transmission rate that is currently
`being transmitted is, the larger the rate_valuei becomes.
`<59>
`In other words, the lower this value is, the more satisfactory channel status is, and it also shows
`that the data transmission rate currently being transmitted is low, and therefore it shows there is a significant
`
` .
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`amount of room for the data transmission rate to increase in the future, but on the other hand, if this value
`is high, it shows that there is no room for the data transmission rate to increase any more.
`<60> After calculating the rate_value (S50), a reverse data transmission rate command (RA: Reverse
`Activity) is generated by comparing the rate_value with the base station data transmission control threshold
`value (threshold_bs) (S60).
`<61> As shown in Fig. 4, regarding the comparative relationship of the base station data transmission
`control threshold value and transmission status value (rate_value), if the rate_valuei is larger than the base
`station threshold value (threshold_bs), a reverse data transmission rate bit (RA) for the Ith terminal is set to
`RAi down, that is, a decrease command.
`<62> Conversely, if the value of the rate_valuei is smaller than two times the base station threshold value,
`up, that is, an increase command is set, and if two cases of the decrease command and increase command
`are excluded, a command for maintaining the current data transmission rate is set.
`<63> Comparative relationship conditions of the base station data transmission control threshold
`(threshold_bs) and rate_valuei appear as:
`<64>
`if(rate_valuei > base station threshold value (threshold_bs)RAi=down
`<65>
`else if (rate_valuei < 2*base station threshold value (thershold_bs)RAi=up
`<66>
`else RAi=no change.
`<67>
`
`<68> The set reverse data transmission rate command (RA) is communicated to each terminal through a
`transmission lake command (RA) channel (S70), and these terminals adjust (S80) and service data
`transmission rate of a next ffp, in the absence of an independent test thereof.
`
`[Effect of the Invention]
`<69> As described above, the present invention generates reverse data transmission rate bits by
`considering total interference amount received at a base station as well as reception status of each terminal,
`and therefore more efficient data transmission occurs, and this increases throughput, and a large gain arises
`in terms of operating a base station as well, as accurate load adjustment becomes possible at a base station.
`<70> Through the details described above, a person having skill in the art will understand that various
`changes and modifications can be made within a scope that does not depart from the technical spirit of the
`present invention.
`<71> Therefore, the technical scope of the present invention is not limited by the details set forth in the
`embodiments but must be established by the scope of claims.
`
`
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`[Scope of Patent Claims]
`[Claim 1]
`A transmission rate control method in a reverse link comprising:
`a step of calculating total interference amount of a signal that is received from one or more terminals;
`a step of finding a data transmission control threshold value according to the total interference
`amount;
`a step of calculating transmission status value by receiving reception pilot strength and a reverse
`data transmission rate from the terminal; and
`a step of generating a reverse data transmission rate command by comparing the transmission status
`value and the data transmission control threshold and transmitting it to each of the terminals.
`[Claim 2]
`The data transmission rate control method in a reverse link of claim 1,
`wherein the base station transmission control threshold value maintains the threshold value if the
`total interference amount is within an established range, and if the total interference amount is less than or
`equal to an established range, increases the threshold value by a certain value, and if the total interference
`amount is more than or equal to an established range, decreases the threshold value by a certain value for
`the threshold value.
`[Claim 3]
`The data transmission rate control method in a reverse link of claim 1,
`wherein, for the comparison between the reception pilot strength, the transmission status value
`corresponding to a reverse data transmission rate, and the data transmission control threshold value, if the
`transmission status value is higher than the threshold value of a base station, decrease rate bits are generated,
`if the transmission status value is smaller than two times the threshold value of a base station, increase rate
`bits are generated, and in other cases excluding the decrease rate bits and increase rate bits, current data
`transmission maintain rate bits are generated.
`[Claim 4]
`A data transmission rate control method in a reverse link comprising:
`a step of calculating total interference amount that is received at a base station;
`a step of receiving reception pilot strength and reverse data transmission rate from a terminal;
`and a step of generating a reverse data transmission rate command by using the total interference
`amount, the reception pilot strength, and the reverse data transmission rate, and transmitting it to a terminal.
`
`
`
`Ex. 1013 - Sierra Wireless, Inc.
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`[Fig. 1]
`
`[Figures]
`
`Base station (1)
`
`Terminal (2)
`
`Calculate total
`interference amount
`received
`
`Generate RA by comparing
`total interference amount
`and threshold
`
`Transmit RA to terminal
`
`Test data rate adjustment
`
`Adjust the reverse data
`transmission rate
`
`
`
`
`
`
`
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`[Fig. 2]
`
`Base station (10)
`
`Terminal (20)
`
`Transmit pilot
`
`Calculate total interference
`amount received
`
`Update threshold_bs according to
`total interference amount
`
`Calculate rate_value
`
`Transmit reception pilot strength
`and reverse data transmission rate
`
`Generate RA for each terminal by
`comparing threshold_bs and rate_value
`
`Transmit RA to each terminal
`
`Adjust reverse data transmission
`rate
`
`
`
`
`[Fig. 3]
`
`Total interference
`amount
`
`
`
`
`
`
`
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`[Fig. 4]
`
`
`
`
`Compare threshold_bs
`and rate_value
`
`
`
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