I 1111111111111111 11111 lllll 111111111111111 111111111111111 IIIIII IIII IIII IIII
`US007986959B2
`
`c12) United States Patent
`Malladi et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 7,986,959 B2
`Jul. 26, 2011
`
`(54) PREAMBLE BASED UPLINK POWER
`CONTROL FOR LTE
`
`(75)
`
`Inventors: Durga Prasad Malladi, San Diego, CA
`(US); Juan Montojo, San Diego, CA
`(US)
`
`(73) Assignee: QUALCOMM Incorporated, San
`Diego, CA (US)
`
`( *) Notice:
`
`Subject to any disclaimer, the term ofthis
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 551 days.
`
`(21) Appl. No.: 12/030,333
`
`(22) Filed:
`
`Feb.13,2008
`
`(65)
`
`Prior Publication Data
`
`US 2008/0207150Al
`
`Aug. 28, 2008
`
`Related U.S. Application Data
`
`(60) Provisional application No. 60/889,931, filed on Feb.
`14, 2007.
`
`(51)
`
`Int. Cl.
`H04B 7100
`(2006.01)
`(52) U.S. Cl. ........................................ 455/522; 370/355
`(58) Field of Classification Search .................... 455/69,
`455/522, 13.4; 370/335
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`6,757,319 Bl
`6/2004 Parsa et al.
`6,859,445 Bl
`2/2005 Moon et al.
`7,020,483 B2
`3/2006 Oestreich
`2007 /0030829 Al
`2/2007 Vimpari
`2008/0280638 Al
`11/2008 Malladi et al.
`
`EP
`EP
`GB
`
`FOREIGN PATENT DOCUMENTS
`2/2006
`1628413
`1/2008
`1873935
`7/2003
`2384650
`
`RU
`RU
`WO
`WO
`
`2221331 C2
`2249915
`WO0152440
`2006104208
`
`1/2004
`4/2005
`7/2001
`10/2006
`
`OTHER PUBLICATIONS
`
`International Search Report-PCT/US08/053922-International
`Search Authority, European Patent Office---Oct. 16, 2008.
`Written Opinion-PCT/US08/053922-International
`Authority, European Patent Office---Oct. 16, 2008.
`International Preliminary Report on Patentability-PCT/US08/
`053922-European Patent Office-Rijswijk-Apr. 29, 2009.
`Siemens AG.: "Improvements to uplink closed-loop power control
`for
`l.28Mcps TDD", 3GPP TSG-RAN WG Meeting #46,
`Rl-050315, Feb.18, 2005 sections 8.6.6.11, 10.3.6.65, 10.3.6.91.
`Translation of Office Action in Rusian application 2009134178 cor(cid:173)
`responding to U.S. Appl. No. 12/030,333, citing US20070030829,
`RU2249915 and RU2221331 dated Mar. 1, 2011.
`
`Search
`
`Primary Examiner - Tu X Nguyen
`(74) Attorney, Agent, or Firm - Darrell Scott Juneau;
`Jimmy Cheng
`
`(57)
`
`ABSTRACT
`
`Systems and methodologies are described that facilitate uti(cid:173)
`lizing power control preambles with closed loop power con(cid:173)
`trol techniques in a wireless communication environment. An
`uplink grant can be transferred over a downlink ( e.g., a first
`uplink grant after uplink inactivity), and a power control
`preamble can be sent over an uplink in response to the uplink
`grant. According to an example, transmission of the power
`control preamble can be explicitly scheduled and/or implic(cid:173)
`itly scheduled. The power control preamble can be transmit(cid:173)
`ted at a power level determined by an access terminal utilizing
`an open loop power control mechanism. A base station can
`analyze the power control preamble and generate a power
`control command based thereupon to correct the power level
`employed by the access terminal. The access terminal can
`thereafter utilize the power control command to adjust the
`power level for uplink data transmission.
`
`33 Claims, 17 Drawing Sheets
`
`-- 116
`
`'~ 1 1 8
`
`1 2 0~
`
`✓-100
`
`122
`
`IPR2022-00456
`Apple EX1006 Page 1
`
`

`

`U.S. Patent
`
`Jul. 26, 2011
`
`Sheet 1 of 17
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`US 7,986,959 B2
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`Apple EX1006 Page 3
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`IPR2022-00456
`Apple EX1006 Page 4
`
`

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`IPR2022-00456
`Apple EX1006 Page 5
`
`

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`IPR2022-00456
`Apple EX1006 Page 6
`
`

`

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`IPR2022-00456
`Apple EX1006 Page 7
`
`

`

`U.S. Patent
`
`Jul. 26, 2011
`
`Sheet 7 of 17
`
`US 7,986,959 B2
`
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`IPR2022-00456
`Apple EX1006 Page 8
`
`

`

`U.S. Patent
`
`Jul. 26, 2011
`
`Sheet 8 of 17
`
`US 7,986,959 B2
`
`AT
`
`BASE STATION
`
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`
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`
`IPR2022-00456
`Apple EX1006 Page 9
`
`

`

`U.S. Patent
`
`Jul. 26, 2011
`
`Sheet 9 of 17
`
`US 7,986,959 B2
`
`AT
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`
`IPR2022-00456
`Apple EX1006 Page 10
`
`

`

`U.S. Patent
`
`Jul. 26, 2011
`
`Sheet 10 of 17
`
`US 7,986,959 B2
`
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`IPR2022-00456
`Apple EX1006 Page 11
`
`

`

`U.S. Patent
`
`Jul. 26, 2011
`
`Sheet 11 of 17
`
`US 7,986,959 B2
`
`1100~
`
`(START)
`
`RECEJV[NG AN UPLINK GRANT
`FROM A BASE STATION
`
`I __ ""2
`
`1--"u
`
`/
`
`TRA.NSThUTTING A PO\VER
`CONTROL PREA:!\•'iBLE TO THE
`BASE STAI'lON '½"lTH A PO\'VER
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`PO\\lER (~ONTROL
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`
`,.- END . "1
`/
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`----
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`IPR2022-00456
`Apple EX1006 Page 12
`
`

`

`U.S. Patent
`
`Jul. 26, 2011
`
`Sheet 12 of 17
`
`US 7,986,959 B2
`
`1200 ~
`
`~ I
`
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`IPR2022-00456
`Apple EX1006 Page 13
`
`

`

`U.S. Patent
`
`Jul. 26, 2011
`
`Sheet 13 of 17
`
`US 7,986,959 B2
`
`ACCESS TERMINAL
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`
`IPR2022-00456
`Apple EX1006 Page 14
`
`

`

`U.S. Patent
`
`Jul. 26, 2011
`
`Sheet 14 of 17
`
`US 7,986,959 B2
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`HASE STATION
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`
`IPR2022-00456
`Apple EX1006 Page 15
`
`

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`IPR2022-00456
`Apple EX1006 Page 16
`
`

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`
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`
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`COMPONENT :FOR
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`
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`
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`
`IPR2022-00456
`Apple EX1006 Page 17
`
`

`

`\0 = N
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`
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`
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`
`IPR2022-00456
`Apple EX1006 Page 18
`
`

`

`US 7,986,959 B2
`
`1
`PREAMBLE BASED UPLINK POWER
`CONTROL FOR LTE
`
`2
`reliability level in all situations, and most notably in situations
`with extended periods of data inactivity in the UL.
`
`SUMMARY
`
`CROSS-REFERENCE TO RELATED
`APPLICATIONS
`
`This application claims the benefit of U.S. Provisional
`Patent application Ser. No. 60/889,931 entitled "A METHOD
`AND APPARATUS FOR POWER CONTROL USING A
`POWER CONTROL PREAMBLE" which was filed Feb. 14,
`2007. The entirety of the aforementioned application is herein
`incorporated by reference.
`
`BACKGROUND
`
`15
`
`The following presents a simplified summary of one or
`more embodiments in order to provide a basic understanding
`of such embodiments. This summary is not an extensive over(cid:173)
`view of all contemplated embodiments, and is intended to
`10 neither identify key or critical elements of all embodiments
`nor delineate the scope of any or all embodiments. Its sole
`purpose is to present some concepts of one or more embodi(cid:173)
`ments in a simplified form as a prelude to the more detailed
`description that is presented later.
`In accordance with one or more embodiments and corre-
`sponding disclosure thereof, various aspects are described in
`connection with facilitating utilization of power control pre(cid:173)
`ambles with aperiodic closed loop power control techniques
`in a wireless communication environment. An uplink grant
`20 can be transferred over a downlink ( e.g., a first uplink grant
`after uplink inactivity), and a power control preamble can be
`sent over an uplink in response to the uplink grant. According
`to an example, transmission of the power control preamble
`can be explicitly scheduled and/or implicitly scheduled. The
`25 power control preamble can be transmitted at a power level
`determined by an access terminal utilizing an open loop
`power control mechanism. A base station can analyze the
`power control preamble and generate a power control com(cid:173)
`mand based thereupon to correct the power level employed by
`30 the access terminal. The access terminal can thereafter utilize
`the power control command to adjust the power level for
`uplink data transmission.
`According to related aspects, a method that facilitates gen(cid:173)
`erating a power control preamble for utilization in a wireless
`35 communication environment is described herein. The method
`can include receiving an uplink grant from a base station, the
`uplink grant being a first uplink grant after uplink inactivity.
`Further, the method can comprise transmitting a power con(cid:173)
`trol preamble to the base station with a power setting based on
`40 open loop power control. Moreover, the method can include
`receiving a power control command from the base station, the
`power control command adjusts the power setting. The
`method can also include transmitting data to the base station
`with the adjusted power setting.
`Another aspect relates to a wireless communications appa-
`ratus. The wireless communications apparatus can include a
`memory that retains instructions related to obtaining an
`uplink grant from a base station, the uplink grant being a first
`uplink grant after uplink inactivity, determining a power level
`50 for power control preamble transmission based upon an open
`loop evaluation, sending a power control preamble to the base
`station at the power level, receiving a power control command
`from the base station, altering the power level based upon the
`power control command, and sending an uplink data trans-
`55 mission to the base station at a power level that has been
`altered in accordance to the power control command. Further,
`the wireless communications apparatus can include a proces(cid:173)
`sor, coupled to the memory, configured to execute the instruc-
`tions retained in the memory.
`Yet another aspect relates to a wireless communications
`apparatus that enables utilizing power control preambles in a
`wireless communication environment. The wireless commu(cid:173)
`nications apparatus can include means forobtaining an uplink
`grant, the uplink grant being a first uplink subsequent to
`65 uplink inactivity. Further, the wireless communications appa(cid:173)
`ratus can include means for transferring an uplink power
`control preamble at a power level selected as a function of an
`
`I. Field
`The following description relates generally to wireless
`communications, and more particularly to controlling uplink
`(UL) power levels employed by access terminals in a Long
`Term Evolution (LTE) based wireless communication sys(cid:173)
`tem.
`II. Background
`Wireless communication systems are widely deployed to
`provide various types of communication; for instance, voice
`and/or data can be provided via such wireless communication
`systems. A typical wireless communication system, or net(cid:173)
`work, can provide multiple users access to one or more shared
`resources ( e.g., bandwidth, transmit power, ... ). For instance,
`a system can use a variety of multiple access techniques such
`as Frequency Division Multiplexing (FDM), Time Division
`Multiplexing (TDM), Code Division Multiplexing (CDM),
`Orthogonal Frequency Division Multiplexing (OFDM),
`Single Carrier Frequency Division Multiplexing (SC-FDM),
`and others. Additionally, the system can conform to specifi(cid:173)
`cations such as third generation partnership project (3GPP),
`3GPP long term evolution (LTE), etc.
`Generally, wireless multiple-access communication sys(cid:173)
`tems can simultaneously support communication for multiple
`access terminals. Each access terminal can communicate
`with one or more base stations via transmissions on forward
`and reverse links. The forward link ( or downlink) refers to the
`communication link from base stations to access terminals,
`and the reverse link ( or uplink) refers to the communication
`link from access terminals to base stations. This communica(cid:173)
`tion link can be established via a single-input-single-output 45
`(SISO), multiple-input-single-output (MISO), single-input(cid:173)
`multiple-output (SIMO) or a multiple-input-multiple-output
`(MIMO) system.
`Wireless communication systems oftentimes employ one
`or more base stations and sectors therein that provide a cov(cid:173)
`erage area. A typical sector can transmit multiple data streams
`for broadcast, multicast and/or unicast services, wherein a
`data stream may be a stream of data that can be ofindependent
`reception interest to an access terminal. An access terminal
`within the coverage area of such sector can be employed to
`receive one, more than one, or all the data streams carried by
`the composite stream. Likewise, an access terminal can trans(cid:173)
`mit data to the base station or another access terminal. With
`many access terminals transmitting signal data in proximity,
`power control is important for yielding sufficient signal to 60
`noise ratios (SNRs) at different data rates and transmission
`bandwidths for communications over the uplink. It is desir(cid:173)
`able to keep the overhead incurred from the transmission of
`the power adjustments to these access terminals as low as
`possible while achieving the aforementioned goals. The
`reduction in the overhead in support of power control adjust(cid:173)
`ments make it difficult to guarantee an adequate reception
`
`IPR2022-00456
`Apple EX1006 Page 19
`
`

`

`US 7,986,959 B2
`
`3
`open loop power control estimate. Moreover, the wireless
`communications apparatus can comprise means for obtaining
`a power control command that alters the power level. Addi(cid:173)
`tionally, the wireless communications apparatus can include
`means for transmitting uplink data at the altered power level. 5
`Still another aspect relates to a machine-readable medium
`having stored thereon machine-executable instructions for
`obtaining an uplink grant, the uplink grant being a first uplink
`grant after uplink inactivity; transferring an uplink power
`control preamble at a power level selected as a function of an 10
`open loop power control estimate; obtaining a power control
`command that alters the power level; and transmitting uplink
`data at the altered power level.
`In accordance with another aspect, an apparatus in a wire- 15
`less communication system can include a processor, wherein
`the processor can be configured to obtain an uplink grant from
`a base station, the uplink grant being a first uplink grant
`subsequent to uplink inactivity. Further, the processor can be
`configured to determine a power level for power control pre- 20
`amble transmission based upon an open loop evaluation. The
`processor can also be configured to send a power control
`preamble to the base station at the power level. Moreover, the
`processor can be configured to receive a power control com(cid:173)
`mand from the base station. Additionally, the processor can be 25
`configured to alter the power level based upon the power
`control command. Further, the processor can be configured to
`send an uplink data transmission to the base station at the
`altered power level.
`According to other aspects, a method that facilitates evalu- 30
`ating power control preambles for employment with power
`control
`in a wireless communication environment
`is
`described herein. The method can include transmitting an
`uplink grant to an access terminal. Further, the method can
`include receiving a power control preamble sent from the 35
`access terminal at a power level set based upon open loop
`power control. Moreover, the method can comprise generat(cid:173)
`ing a power control command based upon an analysis of the
`power control preamble, the power control command corrects
`the power level of the access terminal. The method can also 40
`include transmitting the power control command to the access
`terminal. Additionally, the method can include receiving an
`uplink data transmission sent from the access terminal at the
`corrected power level.
`Yet another aspect relates to a wireless communications 45
`apparatus that can include a memory that retains instructions
`related to transferring an uplink grant, obtaining a power
`control preamble sent via an uplink at a power level deter(cid:173)
`mined by an open loop power control mechanism, yielding a
`power control command that corrects the power level based 50
`upon an evaluation of the power control preamble, sending
`the power control command via a downlink, and obtaining an
`uplink data transmission sent at the corrected power level.
`Further, the wireless communications apparatus can com(cid:173)
`prise a processor, coupled to the memory, configured to 55
`execute the instructions retained in the memory.
`Another aspect relates to a wireless communications appa(cid:173)
`ratus that enables yielding power control commands based
`upon power control preambles for utilization by access ter(cid:173)
`minals in wireless communication environment. The wireless 60
`communications apparatus can include means for sending an
`uplink grant over a downlink. Moreover, the wireless com(cid:173)
`munications apparatus can include means for obtaining a
`power control preamble sent at a power level determined from
`an open loop estimate. The wireless communications appa(cid:173)
`ratus can additionally comprise means for sending a power
`control command that corrects the power level. Further, the
`
`4
`wireless communications apparatus can include means for
`obtaining an uplink data transmission at the corrected power
`level.
`Still another aspect relates to a machine-readable medium
`having stored thereon machine-executable instructions for
`sending an uplink grant over a downlink; obtaining a power
`control preamble sent at a power level determined from an
`open loop estimate; sending a power control command that
`corrects the power level; and obtaining an uplink data trans(cid:173)
`mission at the corrected power level.
`In accordance with another aspect, an apparatus in a wire(cid:173)
`less communication system can include a processor, wherein
`the processor can be configured to transmit an uplink grant to
`an access terminal. The processor can also be configured to
`receive a power control preamble sent from the access termi(cid:173)
`nal at a power level set based upon open loop power control.
`Further, the processor can be configured to generate a power
`control command based upon an analysis of the power control
`preamble, the power control command corrects the power
`level of the access terminal. Moreover, the processor can be
`configured to transmit the power control command to the
`access terminal. Additionally, the processor can be config(cid:173)
`ured to receive an uplink data transmission sent from the
`access terminal at the corrected power level.
`To the accomplishment of the foregoing and related ends,
`the one or more embodiments comprise the features herein(cid:173)
`after fully described and particularly pointed out in the
`claims. The following description and the annexed drawings
`set forth in detail certain illustrative aspects of the one or more
`embodiments. These aspects are indicative, however, of but a
`few of the various ways in which the principles of various
`embodiments can be employed and the described embodi(cid:173)
`ments are intended to include all such aspects and their
`equivalents.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`FIG. 1 is an illustration of a wireless communication sys-
`tem in accordance with various aspects set forth herein.
`FIG. 2 is an illustration of an example system that controls
`uplink power level(s) employed by access terminal(s) in an
`LTE based wireless communication environment.
`FIG. 3 is an illustration of an example system that periodi(cid:173)
`cally corrects an uplink power level employed by an access
`terminal.
`FIG. 4 is an illustration of an example system that aperi(cid:173)
`odically transfers power control commands to access termi(cid:173)
`nals in an LTE based wireless communication environment.
`FIG. 5 is an illustration of an example system that employs
`preamble based uplink power control in an LTE based wire(cid:173)
`less communication environment.
`FIG. 6 is an illustration of an example system that groups
`access terminals for sending power control commands over a
`downlink.
`FIG. 7 is an illustration of example transmission structures
`for communicating power control commands to access ter(cid:173)
`minal groups.
`FIG. 8 is an illustration of an example timing diagram for
`a periodic uplink power control procedure for LTE.
`FIG. 9 is an illustration of an example timing diagram for
`an aperiodic uplink power control procedure for LTE.
`FIG. 10 is an illustration of an example timing diagram for
`an uplink power control procedure for LTE that leverages a
`65 power control preamble.
`FIG. 11 is an illustration of an example methodology that
`facilitates generating a power control preamble for utilization
`
`IPR2022-00456
`Apple EX1006 Page 20
`
`

`

`US 7,986,959 B2
`
`5
`with power control in a Long Term Evolution (LTE) based
`wireless communication environment.
`FIG. 12 is an illustration of an example methodology that
`facilitates evaluating power control preambles for employ(cid:173)
`ment with power control in a Long Term Evolution (LTE) 5
`based wireless communication environment.
`FIG.13 is an illustration of an example access terminal that
`facilitates utilizing power control preambles with power con(cid:173)
`trol in an LTE based wireless communication system.
`FIG. 14 is an illustration of an example system that facili-
`tates analyzing power control preambles for use with power
`control in an LTE based wireless communication environ-
`ment.
`FIG. 15 is an illustration of an example wireless network
`environment that can be employed in conjunction with the
`various systems and methods described herein.
`FIG. 16 is an illustration of an example system that enables
`yielding power control commands based upon power control
`preambles for utilization by access terminals in a wireless
`communication environment.
`FIG. 17 is an illustration of an example system that enables
`utilizing power control preambles in a wireless communica(cid:173)
`tion environment.
`
`10
`
`6
`nected to a wireless modem. Moreover, various embodiments
`are described herein in connection with a base station. A base
`station can be utilized for communicating with access termi-
`nal(s) and can also be referred to as an access point, Node B,
`eNode B ( eNB), or some other terminology.
`Moreover, various aspects or features described herein can
`be implemented as a method, apparatus, or article of manu(cid:173)
`facture using standard programming and/ or engineering tech(cid:173)
`niques. The term "article of manufacture" as used herein is
`intended to encompass a computer program accessible from
`any computer-readable device, carrier, or media. For
`example, computer-readable media can include but are not
`limited to magnetic storage devices (e.g., hard disk, floppy
`disk, magnetic strips, etc.), optical disks (e.g., compact disk
`15 (CD), digital versatile disk (DVD), etc.), smart cards, and
`flash memory devices (e.g., EPROM, card, stick, key drive,
`etc.). Additionally, various storage media described herein
`can represent one or more devices and/or other machine(cid:173)
`readable media for storing information. The term "machine-
`20 readable medium" can include, without being limited to,
`wireless channels and various other media capable of storing,
`containing, and/or carrying instruction(s) and/or data.
`Referring now to FIG. 1, a wireless communication system
`100 is illustrated in accordance with various embodiments
`25 presented herein. System 100 comprises a base station 102
`that can include multiple antenna groups. For example, one
`antenna group can include antennas 104 and 106, another
`group can comprise antennas 108 and 110, and an additional
`group can include antennas 112 and 114. Two antennas are
`30 illustrated for each antenna group; however, more or fewer
`antennas can be utilized for each group. Base station 102 can
`additionally include a transmitter chain and a receiver chain,
`each of which can in tum comprise a plurality of components
`associated with signal transmission and reception ( e.g., pro-
`35 cessors, modulators, multiplexers, demodulators, demulti(cid:173)
`plexers, antennas, etc.), as will be appreciated by one skilled
`in the ar