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. 6839
`PATENT-2001-0006839
`
`Date of Application:
`
`FEBRUARY 12, 2001
`
`Applicant(s):
`
`LG ELECTRONICS INC.
`
`[illegible seal]
`
`February 6, 2002
`
`[illegible]
`
`Commissioner of the Korean Intellectual Property Office
`COMMISSIONER
`[seal: Commissioner of the Korean Intellectual Property Office]
`
`Ex. 1011 - Sierra Wireless, Inc.
`Sierra Wireless, Inc., et al. v. Sisvel S.P.A., IPR2021-01141
`Page 1 of 17
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`[Name of document]
`[Category of rights]
`[Recipient]
`[Date of submission]
`[International patent classification]
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`[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]
`[Inventor]
` [Name]
` [Name in English]
`[Resident registration no.]
`[Postal code]
`[Address]
`
`[Nationality]
`[Inventor]
` [Name]
` [Name in English]
`[Resident registration no.]
`[Postal code]
`[Address]
`[Nationality]
`[Inventor]
`[Name]
`[Name in English]
`[Resident registration no.]
`
`
`
`
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`
`
`[Bibliographic matters]
`Patent application form
`Patent
`Commissioner of the Korean Intellectual Property Office
`February 12, 2001
`H04B
`
`[illegible]
`Reverse link packet transmission method and apparatus
`Method and apparatus of Packet transmission for the reverse
`link
`
`LG Electronics Inc.
`1-1998-000275-8
`
`HEO, Yong-Rok
`9-1998-000616-9
`1999-043458-0
`
`[illegible]
`
`
`LEE, Young-Jo
`LEE, Young Jo
`690131-1018722
`435-040
`#108-602, Jugong 1 Danji, 849, Sanbon-dong, Gunpo-si,
`Gyeonggi-do
`KR
`
`AHN, Jong-Hyae
`AHN, Jong Hyae
`720126-1539219
`431-081
`987-5, Hogye 1-dong, Dongan-gu, Anyang-si, Gyeonggi-do
`KR
`
`YUN, Young-Woo
`YUN, YounG Woo
`700122-1041915
`
`Ex. 1011 - Sierra Wireless, Inc.
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`[Postal code]
`[Address]
`[Nationality]
`[Purpose]
`
`[Fees]
` [Basic application fee]
` [Additional application fee]
` [Priority claim fee]
` [Examination request fee]
` [Total]
`[Attached documents]
`
`156-090
`#111-1014, Kukdong Apt., Sadang-dong, Dongjak-gu, Seoul
`KR
`I hereby apply as described above according to Article 42 of
`the Patent Act. Agent
`HEO, Yong-Rok (seal)
`
`page(s)
`17
`page(s)
`0
`case(s)
`0
`claims(s)
`0
`29,000 won
`1. Abstract and Specification (figures)_1 copy
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`29,000 won
` 0
`won
` 0
`won
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`won
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`Ex. 1011 - Sierra Wireless, Inc.
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`[Abstract]
`
`[Abstract]
`The present invention relates to a reverse link packet transmission method and apparatus
`for transmitting a packet transmission rate increase or decrease message to each mobile station
`using load information of a reverse link at a base station to improve data transmission efficiency
`of a reverse link in a mobile communication system.
`In connection with data transmission of a reverse link, the present invention comprises: a
`step of a base station measuring interference level of an entire traffic channel; a step of determining
`load of a reverse link by comparing the measured interference value and a threshold value; and a
`step for dedicatedly transmitting information on the increase and decrease of transmission data
`rate for each mobile station by using the load information and distance information between each
`base station and the mobile station.
`Therefore, according to the present invention, each transmission rate can be controlled for
`each mobile station by dedicatedly transmitting RAB information to each mobile station in
`consideration of the load information of the reverse information and the mobile station distance,
`and since it is possible to obtain information on increase and decrease of transmission data rate,
`which was not possible in the conventional art, through RAB, the data transmission efficiency
`(throughput) can be increased.
`
`[Representative figure]
`Fig. 5
`[Keywords]
`Mobile communication, transmission speed, transmission rate, dedicated common channel
`
`
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`[Specification]
`
`
`[Title of the invention]
`Reverse link packet transmission method and apparatus {Method and apparatus of Packet
`transmission for the reverse link}
`[Brief description of figures]
`Fig. 1 is a conventional channel structure for transmitting increase and decrease
`information (RAB) of a transmission data rate.
`Fig. 2 is a configuration diagram of an embodiment for transmitting information on
`increase and decrease of transmission data to each mobile station in a base station of the mobile
`communication system according to the present invention.
`Fig. 3 is a configuration diagram of an embodiment for receiving information on the
`increase and decrease of transmission data from a base station in a mobile station of a mobile
`communication system according to the present invention.
`Fig. 4 is a detailed block diagram of information on the increase and decrease of
`transmission data rate and transmission channel determination unit (24) in the base station of Fig. 2.
`Fig. 5 is a flowchart of an embodiment describing an operation for transmitting information
`on the increase and decrease of transmission data rate to each mobile station in a 1XEV-DV system.
`
`[Detailed description of the invention]
`[Object of the invention]
`[Technical field to which the invention pertains and prior art in the field]
`<6> The present invention relates to a reverse link packet transmission method and apparatus
`for transmitting a message about an increase or a decrease in a packet transmission rate to each
`mobile station using load information of a reverse link at a base station in order to improve data
`transmission efficiency of the reverse link in a mobile communication system, and in particular, it
`relates to a reverse link packet transmission method and apparatus using forward link feedback
`information capable of controlling a transmission rate for each mobile station by measuring
`interference level of an entire traffic channel in a base station, comparing it with the threshold
`value, and using the derived value to dedicatedly transmit information on the increase and decrease
`of transmission data rate (Reverse Activity Bit, RAB) for each mobile station.
`
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`<7> More specifically, the present invention uses load information of a reverse link obtained
`by measuring interference level of an entire traffic channel and comparing it with the threshold
`value at the base station, and the value derived by adding the relative offset that has decimated the
`code generated in the long code generator and the initial offset indicating the location information
`of each mobile station in a MUX unit to dedicatedly transmit information on the increase and
`decrease of transmission data rate for each mobile station, and accordingly, the mobile station that
`has received its RAB information changes the transmission data rate one step at a time according
`to the RAB command and transmits it, and informs a base station of its transmission data rate
`through an RRI (Reverse Rate Indicator).
`<8>
`In general, an HDR (High Data Rink) system, which is an IP-based system having burst
`characteristics and optimized for packet transmission that is not sensitive to delay, is a technology
`that enables high-speed data transmission of up to 2.4576 Mbps.
`<9> The HDR system is a system that is exclusively for high-speed packet transmission and
`uses the same frequency band (1.25 MHz) as that of a current IS-95 system.
`<10> The most significant feature of a forward link of an HDR system is the fact that it does not
`classify users by orthogonal codes but instead by time slots, and a single time slot is 1.67 ms.
`<11> There is almost no interference from other users as only one person occupies the channel
`at a certain moment, and since power control is not performed, the base station (Access Network,
`AN) can always transmit a signal at the maximum output. Not performing power control is to
`maximize the benefits of packet transmission, and while the IS-95 system has to guarantee the
`same data rate to all users, packet transmission does not have to. Therefore, users who receive
`strong signals can receive a service that is that much higher in data rate, and conversely, users
`receiving weak signals are compensated for unequal data by allocating more time slots instead.
`<12> However, there is also a problem in that it is difficult to provide a high-speed service to
`users who are far from the base station due to not performing power control.
`<13> In an IS-95 system, all users transmit signals at the same time, and since pilot signals are
`transmitted at the same time as well, there is a problem of interference by pilot signals and waste
`of radio power.
`<14> However, since HDR uses a burst pilot, the pilot signal is transmitted at the maximum
`output, and therefore, there are advantages in that the strength of the signal can be accurately
`measured, the error rate can be reduced, and interference caused by the pilot signal can be reduced.
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`In addition, since it is a synchronous system, the pilot signal of the adjacent cell is also generated
`at the same time, thus it can be considered that interference by the pilot signal of the adjacent cell
`has been minimized.
`<15> A forward link of an HDR system can receive services from as little as 38.4 kbps to as
`much as 2.4576 Mbps, depending on the strength of the signal received by the AT (Access
`Terminal).
`<16> A reverse link of an HDR system is similar to the reverse link of the IS-95 system, and
`performance has been improved by using a user pilot signal. In addition, it uses the traditional
`power control method of IS-95 and provides services from 9.6 Kbps to 153.6 Kbps.
`<17> Fig. 1 is a conventional channel structure for transmitting increase and decrease
`information (RAB) of a transmission data rate.
`<18> As shown in the figure, a base station (not shown) estimates (measures) the load of the
`reverse link, and repeats (bit repetition) (10) information on the increase and decrease of
`transmission data rate (RAB), such as messages about whether the load is large or small, by an
`arbitrary number to improve transmission reliability, and performs Signal Point Mapping (0-> +1,
`1-> -1) to transmit to all users through a common channel called RA (Reverse Activity) channel
`of the forward link.
`<19> When the mobile terminal (Access Terminal, AT) receives a message indicating that the
`load is too high by receiving a message of the RA channel, it reduces the packet data rate of the
`reverse link in half.
`<20> However, in the case of a conventional HDR system, the base station (AN) estimates the
`load of the reverse link and transmits feedback through a common channel called the RA channel,
`and when the load is large, the reverse link packet data rate of all users is reduced by half, thereby
`reducing the data processing efficiency (throughput) of each mobile station.
`<21> In addition, when load is small, there is no message indicating that the reverse link packet
`data rate should be increased, which is inefficient.
`
`[Technical problems to be solved by the invention]
`<22> Therefore, with the object to improve the packet transmission efficiency of the reverse link
`using forward link feedback information of a mobile communication system, the present invention
`dedicatedly transmits the RAB to each mobile station using a common channel according to the
`
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`location information of each mobile station derived by adding a relative offset that has decimated
`the code generated in the long code generator and an initial offset indicating the location
`information for each mobile station in a MUX unit by using the load information of the reverse
`link and distance information of the mobile station to determine the information on the increase
`and decrease of transmission data rate (RAB), and accordingly, the mobile station that has received
`its RAB information changes the transmission data rate one step at a time according to the RAB
`command and transmits it, and informs the base station of its transmission data rate through an
`RRI (Reverse Rate Indicator).
`
`[Configuration and operation of the invention]
`<23> The apparatus that notifies of the data transmission rate in the reverse link of the present
`invention is configured by comprising a reception processing unit for a base station to demodulate
`a signal received from a mobile station; an interference level estimation unit for estimating an
`interference level for a signal transmitted from the reception processing unit; a comparison unit
`for estimating the load of a reverse link by comparing an estimated value estimated by the
`interference level estimation unit and a predetermined threshold value; information on the increase
`and decrease of transmission data rate and a transmission channel determination unit for
`determining information on the increase and decrease of transmission data rate received from a
`mobile station according to the result of the comparison and for judging the location of each mobile
`station according to the RAB location in a channel slot; and a transmission processing unit for
`modulating a transmission signal containing said information on the increase and decrease of
`transmission data rate and information on the increase and decrease of transmission data rate
`output from the transmission channel determination unit to transmit it to a mobile station.
`<24> In addition, the present invention comprises a step in which a base station measures
`interference level of an entire traffic channel; a step for judging a load of a reverse link by
`comparing the measured interference value with a threshold value; and a step for dedicatedly
`transmitting information on the increase and decrease of transmission data rate for each mobile
`station by using the load information and distance information between each base station and
`mobile station.
`<25> Preferably, in the present invention, to dedicatedly transmit information on the increase
`and decrease of transmission data rate for each mobile station, RAB location is obtained in a
`
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`channel slot for classifying each mobile station by adding the relative offset that has decimated the
`code generated in the long code generator and the initial offset indicating the location information
`of each mobile station in a MUX unit.
`<26> Preferably, in the present invention, information on increase and decrease of transmission
`data rate (RAB) sent by a base station to a mobile station maps RAB to 0 when the transmission
`data rate is raised compared to before, maps RAB to 1 when it is lowered, and does not transmit
`RAB when it is the same.
`<27> Other objects and characteristics of the present invention will become apparent through
`detailed description of embodiments with reference to the attached figures.
`<28> Hereinafter, a reverse link data transmission speed transmission apparatus and method
`according to the present invention will be described with reference to the attached figures.
`<29> First, the present invention is to improve the data transmission efficiency of a reverse link
`by defining a new common channel for dedicatedly notifying each mobile station of respective
`information on the increase and decrease of transmission data rate in order to improve said
`conventional problem, that is, the decrease in data transmission efficiency caused by the base
`station measuring the load of a reverse link and transmitting the common channel to the mobile
`station.
`<30> Fig. 2 is a configuration diagram of an embodiment for transmitting information on the
`increase and decrease of transmission data to each mobile station in a base station of the mobile
`communication system according to the present invention.
`<31> As illustrated in Fig. 2, the reverse link packet transmission apparatus using forward link
`feedback information in a mobile communication system of the present invention is composed of
`a reception processing unit (21) for demodulating a signal received from a mobile station (terminal)
`(30) at the base station (20), an interference level estimation (measurement) unit (22) for estimating
`an interference level for a signal delivered from the reception processing unit (21), a comparison
`unit (23) for estimating the load of a reverse link by comparing the estimated value estimated by
`the interference level estimation unit (22) with a predetermined threshold value, information on
`the increase and decrease of transmission data rate and a transmission channel determination unit
`(24) for deciding information on the increase and decrease of transmission data rate received from
`a mobile station according to the result of the comparison to determine the location of each mobile
`station according to the RAB location in a channel slot, and a transmission processing unit (25)
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`for modulating a transmission signal containing said information on the increase and decrease of
`transmission data rate and information on the increase and decrease of transmission data rate
`output from the transmission channel determination unit to transmit it to a mobile station (30).
`<32> Fig. 3 is a configuration diagram of an embodiment for receiving information on the
`increase and decrease of transmission data from a base station in a mobile station of the mobile
`communication system according to the present invention.
`<33> Furnishes a reception processing unit (31) for converting the signal information transmitted
`from the transmission processing unit (25) of Fig. 2, a demodulation unit (32) for demodulating
`the signal that has been down-converted by the reception processing unit (31), a transmission data
`rate control unit (33) for controlling the data rate transmitted to the base station according to the
`value of information on the increase and decrease of transmission data rate carried in the signal
`demodulated by the demodulation unit (32), and a transmission processing unit (34) for adjusting
`the transmission data rate of the transmission signal and transmits it to the base station according
`to the transmission data control command delivered from the transmission data rate control
`unit (33).
`<34> Fig. 4 is a detailed block diagram of information on the increase and decrease of
`transmission data rate and transmission channel determination unit (24) in the base station of Fig. 2.
`<35> The information on the increase and decrease of transmission data rate (RAB) is
`determined using the load information of the reverse link and distance information of the mobile
`station as described in Fig. 2.
`<36> On the other hand, the RAB information derived above is transmitted to each mobile station
`through a common channel called the RA channel, and here, a method for classifying each mobile
`station is the RAB location in a channel slot.
`<37> As shown in Fig. 4, the RAB location is determined in the channel slot by adding the initial
`offset value for determining the location of each mobile station (RAB location) in the I and Q
`signals and the relative offset that has decimated the code generated in the long code generator (46)
`in a MUX unit (41, 42).
`<38> In the description above, the initial offset value is obtained during the negotiation process
`between the mobile station and the base station, and among the values input to the MUX, offset 0
`indicates the first position in the slot, and offset N-1 indicates the last position in the slot. In
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`addition, the relative offset randomizes the RAB locations allocated to each mobile station
`(terminal).
`<39> Therefore, RAB information is transmitted according to each mobile station derived from
`the MUX value, and the RAB information is repeated by the repeater (43) for a certain number of
`times to improve transmission reliability, is converted in Signal Point Mapping (44), and then
`amplified by the amplification unit (45) to be transmitted to a mobile station.
`<40> As for the information on the increase and decrease of transmission data rate (RAB) sent
`by the base station to the mobile station in the Signal Point Mapping, the RAB is mapped to 0
`when the transmission data rate is raised compared to before, the RAB is mapped to 1 when it is
`lowered, and the RAB is not transmitted when it is the same.
`<41> To further describe the details related to Fig. 4, if the RAB update rate is 800 Hz, the
`maximum number of mobile stations capable of controlling the transmission data rate is 24 (I =
`12, Q = 12) when N (number of channels) is 12, if the RAB update rate is 400 Hz, the maximum
`number of mobile stations capable of controlling the transmission data rate is 48 (I = 24, Q = 24)
`when N (number of channels) is 24, and if the RAB update rate is 200 Hz, the maximum number
`of mobile stations capable of controlling the transmission data rate is 96 (I = 48, Q = 48) when N
`(number of channels) is 48. In addition, if the number of RA channels is n, the maximum number
`of mobile stations capable of controlling gets multiplied by n again.
`<42> Fig. 5 is a flowchart of an embodiment describing an operation for transmitting information
`on the increase and decrease of transmission data rate to each mobile station in a 1XEV-DV system.
`<43> First, to provide a general description, the base station estimates the overall interference
`level and compares it with a threshold value to estimate the load of a reverse link. Using the
`estimated load information of the reverse link and distance information between the base station
`and each mobile station, it judges the information on the increase and decrease of transmission
`data rate (RAB) for each mobile station.
`<44> To describe the operation process below, the base station measures the interference level
`of the overall traffic channel (step 51).
`<45> The load of the reverse link is estimated by comparing the interference level and the
`threshold value (steps 52 and 53).
`<46> Information on the increase and decrease of transmission data rate for each mobile station
`is determined by using the load information and distance information between the base station and
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`each mobile station, and as shown in Fig. 4, the initial offset value for determining the location of
`each mobile station (RAB location) in the I and Q signals and the relative offset that has decimated
`the code generated in the long code generator (46) are added in a MUX unit (41, 42) to determine
`the RAB location in a channel slot for classifying each mobile station (step 54).
`<47> The determined RAB is transmitted to each mobile station using a dedicatedly operating
`common channel (step 55).
`<48> As described above, in the present invention, the load information of the reverse link
`obtained by measuring the interference level of an entire traffic channel and comparing it with the
`threshold value at the base station, and the value derived by adding the relative offset that has
`decimated the code generated in the long code generator and the initial offset indicating the
`location information of each mobile station in a MUX unit are used to dedicatedly transmit
`information on the increase and decrease of transmission data rate for each mobile station, and
`accordingly, the mobile station that has received its RAB information changes the transmission
`data rate one step at a time according to the RAB command and transmits it, and informs the base
`station of its transmission data rate through an RRI (Reverse Rate Indicator).
`<49> Although the preferred embodiment of the present invention has been described above, the
`present invention may use various changes, modifications, and equivalents. It is apparent that the
`present invention may be applied equally by appropriately modifying the embodiments described
`above.
`<50> Therefore, the descriptions above do not limit the scope of the present invention defined
`by the descriptions of the scope of claims described below.
`
`[Effect of the invention]
`<51> Therefore, as described in the present invention, each transmission rate for each mobile
`station can be controlled by dedicatedly transmitting RAB information to each mobile station by
`taking into consideration the load information of the reverse information and the distance of the
`mobile station, and information on the increase and decrease of transmission data rate can be
`transmitted, which was impossible in the past, through RAB, which can improve data transmission
`efficiency (throughput).
`
`
`
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`[Scope of claims]
`[Claim 1]
`A data transmission rate transmission apparatus of a reverse link comprising a reception
`processing unit for demodulating a signal received from a mobile station at a base station; an
`interference level estimation unit for estimating an interference level for a signal delivered from a
`reception processing unit; a comparison unit for estimating load of a reverse link by comparing an
`estimated value estimated by interference level estimation unit with a predetermined threshold
`value; information on increase and decrease of transmission data rate and a transmission channel
`determination unit for deciding information on increase and decrease of transmission data rate
`received from a mobile station according to a result of the comparison and for judging the location
`of each mobile station according to an RAB location in a channel slot; and a transmission
`processing unit for modulating a transmission signal containing said information on increase and
`decrease of transmission data rate and information on increase and decrease of transmission data
`rate output from a transmission channel determination unit to transmit to a mobile station.
`
`[Claim 2]
`A data transmission rate transmission method of a reverse link,
`wherein the data transmission of a reverse link comprises: a step of a base station measuring
`interference level of an entire traffic channel; a step for judging the load of a reverse link by
`comparing the measured interference value with a threshold value; and a step for dedicatedly
`transmitting information on the increase and decrease of transmission data rate for each mobile
`station by using the load information and distance information between each base station and the
`mobile station.
`
`[Claim 3]
`The data transmission rate transmission method of a reverse link of claim 2, wherein an
`RAB location is obtained in a channel slot for classifying each mobile station by adding a relative
`offset that has decimated code generated in a long code generator and an initial offset indicating
`location information of each mobile station in a MUX unit to dedicatedly transmit information on
`increase and decrease of transmission data rate for each mobile station.
`
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`[Claim 4]
`The data transmission rate transmission method of a reverse link of claim 2 or 3, wherein
`information on increase and decrease of transmission data rate (RAB) sent by a base station to a
`mobile station maps RAB to 0 when a transmission data rate is raised compared to before, maps
`RAB to 1 when it is lowered, and does not transmit the RAB when it is the same.
`
`
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`[Fig. 1]
`
`[Figures]
`
`
`[Fig. 2]
`Reception antenna
`
`Reception
`processing unit
`
`Base station
`
`
`
`Transmission antenna
`
`Interference level
`measurement unit
`
`Comparison unit
`(interference value/threshold
`value)
`
`Information on the
`increase and decrease of
`transmission data rate and
`transmission channel
`determination unit
`
`Transmission
`processing
`unit
`
`[illegible]
`
`
`[Fig. 3]
`
`Reception antenna
`
`Reception
`processing unit
`
`Mobile station
`
`
`
`Transmission antenna
`
`Demodulation
`unit
`
`Transmission data rate
`control unit
`
`Transmission data control
`command
`
`Transmission
`processing
`unit
`
`
`
`
`
`
`
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`[Fig. 4]
`
`
`[Fig. 5]
`
`
`
`Start
`
`Base station estimates interference level of all traffic channels
`
`Compare interference level value with threshold value
`
`Measure reverse link load
`
`Use load information and distance information with terminal to determine transmission data rate increase
`and decrease and transmission channel for each mobile station
`
`Transmit to mobile station
`
`End
`
`
`
`Ex. 1011 - Sierra Wireless, Inc.
`Sierra Wireless, Inc., et al. v. Sisvel S.P.A., IPR2021-01141
`Page 17 of 17
`
`