UNITED STATES PATENT AND TRADEMARK OFFICE
`_____________________
`
`BEFORE THE PATENT TRIAL AND APPEAL BOARD
`_____________________
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`
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`APPLE INC.
`Petitioner
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`v.
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`DSS TECHNOLOGY MANAGEMENT, INC.
`Patent Owner
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`U.S. Patent No. 6,128,290
`_____________________
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`Inter Partes Review Case No. Unassigned
`_____________________
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`DECLARATION OF JACK D. GRIMES, PH.D.
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`APL 1008
`IPR of U.S. Pat. No. 6,128,290
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`Inter Partes Review of USPN 6,128,290
`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`TABLE OF CONTENTS
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`IX.(cid:1)
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`Introduction ................................................................................................... 4(cid:1)
`I.(cid:1)
`My Background and Qualifications .............................................................. 5(cid:1)
`II.(cid:1)
`List of Documents Considered in Formulating My Opinion ........................ 6(cid:1)
`III.(cid:1)
`Person of Ordinary Skill in the Art ............................................................... 7(cid:1)
`IV.(cid:1)
`V.(cid:1) My Understanding of Claim Construction .................................................... 7(cid:1)
`VI.(cid:1)
`The Basis of my Analysis with Respect to Obviousness .............................. 7(cid:1)
`VII.(cid:1) The ’290 Patent Specification ....................................................................... 9(cid:1)
`VIII.(cid:1) Terminology of the Claims of the ’290 patent ............................................ 13(cid:1)
`A.(cid:1)
`“within short range of said server unit” ............................................. 13(cid:1)
`B.(cid:1)
`“code sequence” ................................................................................. 13(cid:1)
`State of the Art Before October 14, 1997 and Summary of References ..... 15(cid:1)
`A.(cid:1) Barber ................................................................................................. 16(cid:1)
`B.(cid:1) Natarajan ............................................................................................ 20(cid:1)
`C.(cid:1) Neve ................................................................................................... 25(cid:1)
`Summary Chart of Analysis Over the Art ................................................... 27(cid:1)
`X.(cid:1)
`XI.(cid:1) Ground 1: Claims 1-4 would have been obvious in view of Barber. ......... 27(cid:1)
`A.(cid:1)
`Independent claim 1 would have been obvious in view of
`Barber. ................................................................................................ 27(cid:1)
`B.(cid:1) Claim 2 would have been obvious in view of Barber. ....................... 42(cid:1)
`C.(cid:1) Claim 3 would have been obvious in view of Barber. ....................... 43(cid:1)
`D.(cid:1) Claim 4 would have been obvious in view of Barber. ....................... 44(cid:1)
`XII.(cid:1) Ground 2: Claims 1-4 would have been obvious over Natarajan in
`view of Neve. .............................................................................................. 45(cid:1)
`A.(cid:1) Overview of the Combination of Natarajan and Neve ....................... 45(cid:1)
`B.(cid:1)
`Independent claim 1 would have been obvious over
`Natarajan in view of Neve. ................................................................. 49(cid:1)
`C.(cid:1) Claim 2 would have been obvious over Natarajan in view of
`Neve. .................................................................................................. 65(cid:1)
`D.(cid:1) Claim 3 would have been obvious over Natarajan in view of
`Neve. .................................................................................................. 66(cid:1)
`E.(cid:1) Claim 4 would have been obvious over Natarajan in view of
`Neve. .................................................................................................. 67(cid:1)
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`XIII.(cid:1) Objective Indicia of Nonobviousness ......................................................... 68(cid:1)
`XIV.(cid:1) Conclusion ................................................................................................... 70(cid:1)
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`Inter Partes Review of USPN 6,128,290
`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`I, Jack D. Grimes, Ph.D., hereby declare as follows:
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`Inter Partes Review of USPN 6,128,290
`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`I.
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`Introduction
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`1.
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`I am over the age of eighteen (18) and otherwise competent to make
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`this declaration.
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`2.
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`I have been retained as an expert witness on behalf of APPLE INC. for
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`the above-captioned inter partes review (IPR). I am being compensated for my
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`time in connection with this IPR at my standard legal consulting rate, which is
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`$500 per hour. I understand that the petition for inter partes review involves U.S.
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`Patent No. 6,128,290 (“the ’290 patent”), APL 1001, which issued from U.S.
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`Patent Application No. 08/949,999 (“the ’999 application”), filed on October 14,
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`1997. The ’290 patent is a continuation-in-part of U.S. Patent Application No.
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`08/611,695, filed on March 6, 1996. The ’290 patent names Phillip P. Carvey as
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`the sole inventor. The ’290 patent issued on October 3, 2000, from the ’999
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`application. It is my understanding that the ’290 patent is currently owned by DSS
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`Technology Management, Inc.
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`3.
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`In preparing this Declaration, I have reviewed the ’290 patent and
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`considered each of the documents cited herein in light of the general knowledge in
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`the art at the time of the alleged inventions. In formulating my opinions, I have
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`relied upon my experience, education and knowledge in the relevant art. I have
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`also considered the viewpoint of a person of ordinary skill in the art (“POSA”)
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`(i.e., a person of ordinary skill in the field of wireless network technology, defined
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`further below) prior to October 14, 1997, the priority date for claims 1-4 of the
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`’290 patent.
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`II.
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`My Background and Qualifications
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`4.
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`I am currently an independent consultant. Since 1989, I have provided
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`studies, strategies and opinions to industry and the legal profession, with particular
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`emphasis on topics including: PDAs, Wireless data systems, Security, Engineering
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`development practices, Microprocessor
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`technology and Computer system
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`architecture. Prior to and during my work as an independent consultant, I worked
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`at senior levels of management for various large and small high technology
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`companies and have over twenty years of management experience at those
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`companies.
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`5.
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`I received my Doctor of Philosophy degree in Electrical Engineering
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`with a minor in Computer Science from Iowa State University in 1970. I received a
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`Master of Science degree in Electrical Engineering from Iowa State University in
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`1968 and a Bachelor of Science degree in Electrical Engineering from Iowa State
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`University in 1965. I also received a Master of Science Degree in Experimental
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`Psychology from the University of Oregon in 1981 with an emphasis on user
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`interface design.
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`6.
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`I have taught courses at the graduate level in computer science for
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`Inter Partes Review of USPN 6,128,290
`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`Oregon State University. I have also taught courses at the graduate and
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`undergraduate level in Electrical Engineering at Iowa State University.
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`7.
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`Additional information concerning my work experience, professional
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`publications, and presentations in the field of computer science, and cases in which
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`I have testified as an expert at trial or deposition are set forth in my current
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`Curriculum Vitae, a copy of which is attached hereto as Exhibit APL 1009.
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`III.
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`List of Documents Considered in Formulating My Opinion
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`8.
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`In formulating my opinion, I have considered
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`the following
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`documents and any other documents cited herein:
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`Apple
`Exhibit #
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`Description
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`1001
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`1002
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`1003
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`1004
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`1005
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`1006
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`Carvey, U.S. Patent No. 6,128,290, “Personal Data Network,” (filed
`October 14, 1997; issued October 3, 2000) (“the ’290 patent”).
`Barber, Thomas J., “BodyLANTM: A Low-Power Communications
`System,” Massachusetts Institute of Technology, submitted January
`30, 1996, archived in Massachusetts Institute of Technology
`Libraries April 11, 1996 (“Barber”).
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`Natarajan et al., U.S. Patent No. 5,241,542, “Battery Efficient
`Operation of Scheduled Access Protocol,” (filed August 23, 1991;
`issued August 31, 1993) (“Natarajan”).
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`Neve et al., U.S. Patent No. 4,887,266, “Communication System,”
`(filed April 29, 1986; issued December 12, 1989) (“Neve”).
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`File history of U.S. Patent No. 6,128,290
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`Application No. 08/611,695 (as-filed)
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`Apple
`Exhibit #
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`Inter Partes Review of USPN 6,128,290
`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`Description
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`1007
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`Apple’s Claim Construction Brief in Case No. 6:13-cv-00919-JDL
`(EDTX)
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`IV.
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`Person of Ordinary Skill in the Art
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`9.
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`I understand that a person of ordinary skill in the art is one who is
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`presumed to be aware of pertinent art, thinks along conventional wisdom in the art,
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`and is a person of ordinary creativity. A person of ordinary skill in the art
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`(“POSA”) of wireless network technology would have typically had an
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`undergraduate degree in Electrical Engineering and 1-2 years of experience
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`working with wireless network technology, or equivalent education and/or work
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`experience, as of the priority date.
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`V.
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`My Understanding of Claim Construction
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`10.
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`I understand that, during an inter partes review, claims are to be given
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`their broadest reasonable construction in light of the specification as would be
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`understood by a person of ordinary skill in the relevant art.
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`VI.
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`The Basis of my Analysis with Respect to Obviousness
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`11.
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`I understand that an obviousness analysis involves comparing a claim
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`to the prior art to determine whether the claimed invention would have been
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`obvious to a person of ordinary skill in the art in view of the prior art, and in light
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`of the general knowledge in the art. I also understand when a person of ordinary
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`skill in the art would have reached the claimed invention through routine
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`experimentation, the invention may be deemed obvious.
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`12.
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`I also understand that obviousness can be established by combining or
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`modifying the teachings of the prior art to achieve the claimed invention. It is also
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`my understanding that where there is a reason to modify or combine the prior art to
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`arrive at the claimed invention, there must also be a reasonable expectation of
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`success in so doing. I understand that the reason to combine prior art references
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`can come from a variety of sources, not just the prior art itself or the specific
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`problem the patentee was trying to solve. And I understand that the references
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`themselves need not provide a specific hint or suggestion of the alteration needed
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`to arrive at the claimed invention; the analysis may include recourse to logic,
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`judgment, and common sense available to a person of ordinary skill that does not
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`necessarily require explanation in any reference.
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`13.
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`I understand that when considering the obviousness of an invention,
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`one should also consider whether there are any secondary considerations that
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`support the nonobviousness of the invention. I understand that secondary
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`considerations of nonobviousness include failure of others, copying, unexpectedly
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`superior results, perception in the industry, commercial success, and a long-felt but
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`unmet need.
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`VII. The ’290 Patent Specification
`14. This declaration is being submitted together with a petition for inter
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`partes review of claims 1-4, of the ’290 patent.
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`15.
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`I have considered the disclosure and file history of the ’290 patent in
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`light of general knowledge in the art before the proper priority date for claims 1-4
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`of the ’290 patent, October 14, 1997.
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`16. The ’290 patent is directed to a data network for “bidirectional
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`wireless data communications between a microcomputer unit and a plurality of
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`peripheral units.” (’290 patent, 1:12-14.) The ’290 patent describes that the “server
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`microcomputer” can be a personal digital assistant (“PDA”). (Id. at 2:66-67.) The
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`“peripheral units” are referred to generally as “personal electronic accessories” or
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`“PEAs”. (Id. at 2:15-18.) The PEAs include input devices such as a keyboard,
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`mouse, body-mounted accessories such as displays “mounted on a headband or
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`eyeglasses”, and “physiological sensors”. (Id. at 1:62-2:18.) These “physiological
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`sensors” can be, for example, temperature, heartbeat, and respiration sensors for
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`patient monitoring and fitness training. (Id. at 2:10-15.) FIG. 1 of the ’290 patent,
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`reproduced below, illustrates the server microcomputer (11) and associated PEAs
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`(21, 29). The ’290 patent describes that the server microcomputer and peripherals
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`are linked “in close physical proximity, e.g., within twenty meters,” to establish a
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`common time base for synchronization. (Id. at 1:50-55.)
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`17. FIGS. 2 and 3, reproduced below, illustrate the PEA modem and PDA
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`modem, respectively. The ’290 patent describes that the PEA modem has five
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`major components: a transmitter (40), a receiver (41), a local oscillator (42) shared
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`by the transmitter and the receiver, a controller (43) which times and coordinates
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`the operations of other components, and a voltage controlled crystal oscillator (44)
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`for maintaining a common time base with the host microcomputer. (Id. at 3:30-39.)
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`Similarly, the PDA modem has five major components: a transmitter (15), a
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`receiver (17), a local oscillator (16) shared by the transmitter and the receiver, a
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`controller (14), and a crystal oscillator (18) for maintaining the network time base.
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`(Id. at 4:9-15.) The ’290 patent describes that “[t]here are no differences between
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`the receiver, local oscillator, and transmitter in both the PEA and PDA modems.”
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`(Id. at 4:16-18.) The ’290 patent describes with respect to FIG. 4 that “transmission
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`is effected using the local oscillator 45 to drive the transmit antenna amplifier 50
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`whose output drives transmit antenna 51.” (Id. at 4:25-27.)
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`18. The ’290 patent’s goal is to “provide wireless communication
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`between a host or server microcomputer unit and a plurality of peripheral units”
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`that is “reliable”, “low power”, “avoids interference from nearby similar systems”,
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`and is “relatively simple”. (Id. at 1:33-46.) The ’290 patent describes that its
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`“general scheme of data transmission and reception is a form of time division
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`multiple access (TDMA)” where transmissions occur “in only those slots indicated
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`by a TDMA program.” (Id. at 3:57-59, 4:1-2.) The ’290 patent further describes
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`that:
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`Both the host and all PEAs share a common TDMA program at one
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`time. For each slot, this TDMA program indicates that a PEA or host
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`is to transmit, or not, and whether it will receive, or not. In the
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`intervals between slots in which a PEA is to transmit or receive, all
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`receive and transmit circuits are powered down. (Id. at 4:2-8.)
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`19. The ’290 patent describes that “code sequences” are generated, which
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`control the operation of the transmitters in a low duty cycle pulsed mode of
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`operation. (Id. at 1:57-61, 2:35-39.) This causes the peripheral units’ transmitters to
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`only be active for short durations of time, which the ’290 patent asserts
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`“substantially reduces power consumption and facilitates the rejection of
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`interfering signals.” (Id. at 1:59-61.)
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`20.
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` The ’290 patent describes that “[t]he codes are mostly zeros with
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`three scattered ones representing the locations of the slots in which RF bursts are to
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`be transmitted or received.” (Id. at 7:27-29.) “The position of each burst is dictated
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`by a one” in a code word. (Id. at 7:23-24.) So what the ’290 patent describes is
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`using a code word consisting of zeros and ones to determine when transmissions
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`are to occur.
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`21. The ’290 patent also states that it would “be understood by those
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`skilled in the art, [that] the TDMA system is greatly facilitated by the
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`establishment of a common frame time base between PEA and PDA.” (Id. at 7:63-
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`65.) I agree that a POSA would have understood that establishing a common time
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`base in a system like the one described in the ’290 patent would have been
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`advantageous. The ’290 patent describes that to establish this common time base,
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`synchronization beacons are transmitted from the PDA to the PEA. (Id. at 7:65-
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`8:2.)
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`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`VIII. Terminology of the Claims of the ’290 patent
`22.
`I understand that, in connection with the inter partes review, claim
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`terms must be given their broadest reasonable construction in light of the patent
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`specification. Except for the claim terms addressed below, I have assumed all other
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`claim terms should be given their plain and ordinary meaning.
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`A. “within short range of said server unit”
`23. The term “within short range of said server unit” appears in claim 1 of
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`the ’290 patent. I note that this term appears only once in the ’290 patent
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`specification, in the Abstract: “a plurality of peripheral units located within short
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`range of the server unit, e.g. within 20 meters.” Although the ’290 patent uses the
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`symbol “e.g.,” meaning “for example,” no other examples are provided anywhere
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`in the ’290 patent. In the art, the term “short range” has no commonly accepted
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`meaning. A POSA would not have known whether this meant 5 meters or 500
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`meters. Therefore, since the only guidance in the ’290 patent specification for this
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`term is “within 20 meters”, I have assumed that the broadest reasonable
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`interpretation of the term “within short range of said server unit” is “within 20
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`meters of said server unit”.
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`B. “code sequence”
`24. The term “code sequence” appears in claims 1 and 3 of the ’290
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`patent. A “code sequence” is not a term of art that would have been known to a
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`POSA and therefore a POSA would have looked to the ’290 patent specification
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`for guidance on the meaning of this term. The ’290 patent describes that “[u]sing
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`the common time base, code sequences are generated which control the operation
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`of the several transmitters in a low duty cycle pulsed mode of operation.” (’290
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`patent, 1:57-59.) The ’290 patent also describes that “[t]he server and peripheral
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`unit transmitters are energized in low duty cycle pulses at intervals which are
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`determined by a code sequence which is timed in relation to the synchronizing
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`information initially transmitted from the server microcomputer”. (’290 patent,
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`2:35-39.) This is similar to the language recited in claim 1. The ’290 patent also
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`discloses that the PEA controller is responsible for “acquiring from the host
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`appropriate code sequences to be used in data communications”. (’290 patent,
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`3:43-44.)
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`25. The ’290 patent also describes “Optically Orthogonal Codes” and
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`“codewords”. (’290 patent, 7:15-44.) “The codes are mostly zeros with three
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`scattered ones representing the locations of the slots in which RF bursts are to be
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`transmitted or received.” (’290 patent, 7:26-29.) Thus, in my opinion, a “code
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`sequence” is a series of ones and zeros (i.e., values) representing possible
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`transmission time slots. A “one” indicates that a unit will transmit in that time slot
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`and, therefore, its transmitter will be energized. A “zero” indicates that a unit will
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`not transmit, and so its transmitter will not be energized (i.e., it is depowered).
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`Accordingly, it is my opinion that the broadest reasonable interpretation of the
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`term “code sequence” in view of the ’290 patent specification is “a series of values,
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`where each value in the series represents a time slot where a unit’s transmitter is
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`energized or a time slot where a unit’s transmitter is depowered.”
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`IX.
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`State of the Art Before October 14, 1997 and Summary of References
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`26.
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`In my opinion, the references asserted against the ’290 patent claims
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`and discussed herein clearly show that the features recited in the ’290 patent claims
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`were well known in the prior art. To the extent that a particular feature is not
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`explicitly described in one of the asserted references, it is my opinion that these
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`features would have been obvious to a POSA.
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`27. Many of the claimed limitations are simply well known components
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`of wireless communication systems performing their standard functions. For
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`example, the claims recite basic features such as the “server microcomputer unit”
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`communicating with multiple “peripheral units”, where these components each
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`have a
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`transmitter and
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`receiver. Further,
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`the claimed “commands”,
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`“synchronization information”, and “input information” were typical types of data
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`that would have been communicated in such networks. Energizing the transmitters
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`and receivers only during designated transmission slots was also well known. So
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`too was synchronizing the clocks, and their associated oscillators, of devices that
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`rely on timed communication plans.
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`28. Thus, it is my opinion that the ’290 patent claims merely recite a
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`collection of well known components performing their standard function according
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`to well known techniques. Quite simply, in my opinion, the ’290 patent claims do
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`not recite any features that were not previously known in the art or would not have
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`been obvious to a POSA.
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`29. Exemplary relevant art that was published before October 14, 1997
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`includes the references described below.
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`A. Barber
`30. The Barber reference
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`is a Master’s
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`thesis, which
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`is
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`titled
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`“BodyLANTM: A Low-Power Communications System”. (Barber, p. 1.) I note that
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`the entirety of Barber’s disclosure is strikingly similar to that of the ’290 patent.
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`The earlier-published Barber thesis actually describes many of the features of the
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`’290 patent in greater detail than the ’290 patent itself.
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`31. Barber is directed to “a low-power wireless
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`communications system designed to operate within the
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`sphere of the body.” (Barber, p. 3.) Barber discloses
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`three possible network configurations: “Star”, “Ring”,
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`and “Complete”. (Barber, pp. 9-10.) Barber discloses that in the “Complete”
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`configuration, each node in the system is identical and “has the ability to
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`independently send data to and receive data from other nodes as well as accept
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`input and deliver output to a user.” (Barber, p. 10.) However, Barber focuses on the
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`“Star” configuration, shown in Figure 1a. (Barber, pp. 9-10.) In the “Star”
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`configuration, all communications occur through a central node call the “Hub”.
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`(Barber, p. 9.) Barber describes that the other nodes are called “Personal Electronic
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`Assistants (PEAs)”. (Barber, p. 12.) These are akin to the “personal electronic
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`accessories (PEAs)” described in the ’290 patent.
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`32. Barber further describes the roles of the Hub and PEAs:
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`The Hub is responsible for interfacing with the user, controlling the
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`overall TDMA schedule and gathering and processing the data from
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`the PEAs. The PEAs are responsible for initializing the connection to
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`the network, gathering data and transmitting the data to the Hub.
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`(Barber, p. 12.)
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`33. Barber describes that the Hub includes a central Hub computer and a
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`controller/modem interface card. (Barber, p. 12.) The central Hub computer
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`presents data gathered from the PEAs to the user and the controller/modem
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`interface card is a PCMCIA card that controls TDMA scheduling and gathers and
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`processes data from the PEAs. (Barber, pp. 12-13.)
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`34. Barber describes that the PEAs have one or more sensors, a radio
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`modem, a microprocessor, and a custom controller integrated circuit. (Barber, p.
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`13.) The sensors collect data, which can be provided to the user via the Hub
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`17
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`computer. (Barber, p. 13.) The radio modem provides a wireless link between the
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`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`PEA and Hub, and the microprocessor handles higher level data processing
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`functions locally at the PEA, for example, computing the phase correction for the
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`symbol clock. (Barber, p. 13.) The controller integrated circuit controls interaction
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`between the PEA and Hub, including synchronizing the local symbol clock to the
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`Hub symbol clock. (Barber, pp. 13-14.)
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`35. Barber also discusses three well known methods of dividing
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`communications access: Time Division Multiple Access (TDMA), Frequency
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`Division Multiple Access (FDMA), and Code Division Multiple Access (CDMA).
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`(Barber, pp. 11-12.) Barber describes that TDMA is the preferred design for the
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`BodyLANTM system. (Barber, p. 12.) In the TDMA system, “each node has a
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`scheduled time to use the channel and is inactive during all other times”, which
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`decreases power consumption. (Barber, p. 11.) The TDMA system involves
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`“synchronizing the receiver symbol clock to the transmitter symbol clock.”
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`(Barber, p. 12.)
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`36. Barber further describes three modes of operation: attachment,
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`synchronization, and TDMA. (Barber, p. 24.) During attachment, the PEA searches
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`for attachment beacons from the Hub. (Barber, p. 26.) Attachment beacons are the
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`same for all PEAs—a 23 bit code word expanded to 32 bits and transmitted during
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`a 520 bit period, shown in Figure 13 of Barber. (Barber, pp. 51-52.) The
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`attachment beacons are collected to form an initial TDMA plan used during the
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`Inter Partes Review of USPN 6,128,290
`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`synchronization phase. (Barber, pp. 52.) Barber describes that:
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`A set of 106 attachment beacons contains the entire sequence of bits
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`necessary to initialized [sic]the TDMA plan. The 106 bits are broken
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`down as follows: 23 bits for a new, PEA specific code word, 42 bits
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`define seven 6-bit time intervals for beacon arrival, 6 bits for a PEA
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`identification number, 6 bits for frequency selection, an 8 bit
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`initialization flag and a 16 bit checksum.
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`(Barber, p. 52.)
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`
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`37. Once the attachment process is completed, the synchronization mode
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`begins. (Barber, p. 26.) Synchronization beacons are transmitted from the Hub to
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`the PEAs with information to align the local symbol clock of a PEA with the Hub
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`symbol clock. (Barber, p. 26.) Like the attachment beacons, the synchronization
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`beacons consist of 32 bits embedded in a 520 bit sequence. (Barber, p. 27.) Barber
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`describes that “the synchronization beacons are based on the code word transmitted
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`to the PEA during the attachment mode, which is a code specific to that Hub rather
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`19
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`than a universal code.” (Barber, p. 27.) Once the PEA and Hub establish a
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`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`communications link and are synchronized, the devices can regularly transmit and
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`receive according to the TDMA plan. (Barber, p. 30.)
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`B. Natarajan
`38. Natarajan is directed to battery power conservation in wireless
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`communications of mobile computers controlled by multi-access protocols.
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`(Natarajan, 1:6-12.) Figure 1 shows that multiple mobile units (10, 12, 14, 16)
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`communicate with base stations (26, 28) via wireless radio links. (Natarajan, 2:28-
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`39, Figure 1.) Natarajan describes that the base stations can be a “conventional
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`microcomputer” and that the mobile units can be a “hand held or laptop computer”.
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`(Natarajan, 2:40-41, 2:58-59.) Both the base stations and mobile units have an RF
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`transceiver for establishing a radio link. (Natarajan, 2:51-56, 2:65-67.) A system
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`schematic common to both the base stations and mobile stations is illustrated in
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`FIG. 3. (Natarajan, 3:7-8.) Each device includes, for example, a microprocessor
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`system (56) that controls the transceiver via interface (58). (Natarajan, 3:14-15.)
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`The microprocessor system also includes a dedicated microprocessor (62) with
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`high-resolution time interval determination hardware or “timers”. (Natarajan, 3:18-
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`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`21.) An interface connects the microprocessor system with computer (50), which
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`includes user application programs (72). (Natarajan, 3:50-52.)
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`39. Natarajan describes that its system is intended “for minimizing battery
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`power consumed by wireless link adapters at the mobile units”. To do so,
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`Natarajan describes turning off the transmitter and receivers when not in use.
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`(Natarajan, 4:2-5.) More specifically, Natarajan describes that:
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`[s]cheduled access multiaccess protocols can be implemented to
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`effectively conserve battery power by suitable control of the state of
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`transmitter and receiver units at the portable units (i.e., by scheduling
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`when they should be turned ON or OFF). A desirable solution is one
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`in which the transmitter (or receiver) consumes power only when it is
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`actively transmitting a message (or actively receiving a message).
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`(Natarajan, 3:59-4:6.)
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`40. Natarajan further describes that the scheduled multiaccess protocol
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`divides time into “fixed-length frames, and frames are divided into slots”, as
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`shown, for example, in FIG. 4. (Natarajan, 4:20-23, FIG. 4.) The frames are
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`divided into subframes where, for example with respect to FIG. 4, one subframe is
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`for transmitting data packets from the base station to mobile units (Period A), a
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`second subframe is for contention-free transmission from mobile units to the base
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`station (Period B), and third subframe is for “bursty data traffic” in a contention
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`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`mode from mobile units to the base station (Period C). (Natarajan, 4:27-38.)
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`
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`41. Natarajan describes that in Period A, the base station controls the
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`outbound transmissions to the mobile units. (Natarajan, 4:40-41.) Prior to Period
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`A, the base station broadcasts a header (AH) to the mobile units that includes: a list
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`of mobile units that will be receiving data packets from the base station, the order
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`in which the mobile units will receive the data packets, and the number of data
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`packets that will be transmitted to each mobile unit. (Natarajan, 4:45-53.) If a
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`mobile unit is not included in header (AH), it will not be receiving data from the
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`base station, and can turn off its receiver for Period A. (Natarajan, 4:63-67.)
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`Because the mobile units know the order and number of data packets to be
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`transmitted, mobile units that will be receiving data can compute when its
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`designated transmission slot will be, go to sleep until that time, and wake itself up
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`in its designated time slot to receive data. (Natarajan, 4:67-5:4.) After receiving its
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`data, the receiver can go back to sleep for the remainder of Period A. (Natarajan,
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`5:4-6.)
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`42. Natarajan similarly discloses broadcasting another header (BH) for
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`Inter Partes Review of USPN 6,128,290
`Declaration of Jack D. Grimes, Ph.D. (APL 1008)
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`scheduling which mobile units will be allowed to transmit to the base station and
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`the order they will transmit. (Natarajan, 5:9-29.) Flow charts of these processes are
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`shown, for example, in FIGS. 8A-8D and described in Natarajan at 8:14-9:53.
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`Using this scheme, the mobile units save power by powering up only during their
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`designated reception or transmission time slot.
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`43. Natarajan more specifically describes that header (AH) includes “a
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`coded description of mobile users that will receive data in the current frame. That
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`is, it is a designati