Court Opinion

ID: 4217680
Source: CourtListenerOpinion
Date Created: 2017-11-03 16:01:43.051947+00
Date Added: 2024-06-11T07:47:09.308270
License: Public Domain

NOTE: This disposition is nonprecedential.

  United States Court of Appeals
      for the Federal Circuit
                ______________________

   INTERDIGITAL COMMUNICATIONS, INC., A
  DELAWARE CORPORATION, INTERDIGITAL
  TECHNOLOGY CORPORATION, A DELAWARE
     CORPORATION, IPR LICENSING, INC., A
  DELAWARE CORPORATION, INTERDIGITAL
 HOLDINGS, INC., A DELAWARE CORPORATION,
              Plaintiffs-Appellees

                           v.

ZTE CORPORATION, A CHINESE CORPORATION,
ZTE (USA) INC., A NEW JERSEY CORPORATION,
              Defendants-Appellants
             ______________________

                      2016-2362
                ______________________

    Appeal from the United States District Court for the
District of Delaware in No. 1:13-cv-00009-RGA, Judge
Richard G. Andrews.
                ______________________

              Decided: November 3, 2017
               ______________________

    MAXIMILIAN A. GRANT, Latham & Watkins LLP,
Washington, DC, argued for plaintiffs-appellees. Also
represented by GABRIEL BELL, RICHARD P. BRESS,
MICHAEL J. GERARDI.
2        INTERDIGITAL COMMUNICATIONS    v. ZTE CORPORATION

    CHARLES M. MCMAHON, McDermott Will & Emery
LLP, Chicago, IL, argued for defendants-appellants. Also
represented by BRIAN ANDREW JONES; NATALIE A.
BENNETT, JAY H. REIZISS, Washington, DC.
                ______________________

Before PROST, Chief Judge, LOURIE, and TARANTO, Circuit
                        Judges.
TARANTO, Circuit Judge.
    InterDigital Communications, Inc.; InterDigital
Technology Corp.; IPR Licensing, Inc.; and InterDigital
Holdings (collectively, InterDigital) brought this suit
against ZTE Corp. and ZTE (USA) Inc. (collectively, ZTE)
in the United States District Court for the District of
Delaware. InterDigital alleged that ZTE was infringing
U.S. Patent Nos. 7,190,966 and 7,286,847, which, as
relevant here, claim a specified apparatus for wireless
communications. InterDigital and ZTE have litigated
these patents and related ones before the International
Trade Commission in at least three proceedings, two of
which resulted in written decisions from this court: Inter-
Digital Communications, LLC v. International Trade
Commission (InterDigital I), 690 F.3d 1318 (Fed. Cir.
2012), and InterDigital Communications, LLC v. Interna-
tional Trade Commission (InterDigital II), 601 F. App’x
972 (Fed. Cir. 2015).
    In this case, a jury found ZTE liable for infringement
of the ’966 and ’847 patents, and the district court denied
ZTE’s post-trial motion for judgment of noninfringement
as a matter of law. ZTE appeals a key claim construction
adopted by the district court as well as the court’s denial
of its post-trial motion. We have jurisdiction under 28
U.S.C. § 1295(a)(1). We affirm.
INTERDIGITAL COMMUNICATIONS       v. ZTE CORPORATION        3

                              I
                              A
    The technology described in the ’966 and ’847 patents
is set forth in detail in our earlier decision addressing
those patents, InterDigital I, 690 F.3d at 1320–23. Here,
we cover only the aspects relevant to the issues on appeal.
     The ’966 and ’847 patents describe how to reduce
“power overshoot” when establishing a connection be-
tween a “subscriber unit,” such as a cell phone, and a base
station in a code division multiple access (CDMA) wireless
communication system. ’966 patent, col. 3, lines 32–40. 1
In order to set up a two-way communication link, the
transmitter in a cell phone sends a signal to the base
station, which the base station can detect if the signal is
transmitted at a sufficient power level. Col. 2, lines 50–
52. But the power level required to be detected is not
known in advance of attempting to make the connection.
Col. 2, lines 45–46. To the extent that the transmitter
uses a power level that overshoots the threshold detection
level, the communication conducted at that unnecessarily
high power level will decrease system capacity, may
interfere with communications between other cell phones
and the base station, and may even cause dropped calls.
Col. 2, lines 23–28, 46–50; see also col. 5, lines 63–67; col.
6, lines 5–6.
    The specification describes two embodiments that use
a “power ramp-up” process to minimize power overshoot.
Col. 3, line 23. In the first embodiment, a transmitter in
the cell phone transmits a code called an “access code” to
the base station. Col. 6, lines 7–10, 19–20, & Fig. 4. “The
access code is a known spreading code transmitted from

    1   The ’966 and ’847 patent share a common specifi-
cation. All patent citations hereafter are to the ’966
patent, unless otherwise indicated.
4         INTERDIGITAL COMMUNICATIONS     v. ZTE CORPORATION

[the cell phone] to the base station during initiation of
communications and power ramp-up.” Col. 6, lines 20–23
(internal references omitted). The access code is first
transmitted at a very low power below any possible detec-
tion level, and then successively transmitted at increasing
levels of power. Col. 6, lines 1–5 & Fig. 5. Once the
access code is transmitted at a power level at or above
that of the threshold detection level, the base station
“search[es] through all possible phases (time shifts) of the
access code . . . in order to find the correct phase.” Col. 6,
lines 23–26 (internal references omitted). The power-
ramp up continues while the base station engages in this
search, called the “detection process.” Col. 6, lines 26–27.
After detecting the correct phase of the access code, the
base station sends “an access code detection acknowl-
edgement signal” back to the cell phone. Col. 6, lines 59–
67. The transmitter and base station then establish a
closed power loop at the power level the transmitter has
reached at the time of the phase detection, and “call setup
signaling is performed” for “the two-way communication
link.” Col. 7, lines 2–5. By proceeding in this manner, the
communication link is closer to the threshold detection
level—and there is less interference and fewer dropped
calls—than if the transmitter had used a higher power
level. Col. 6, lines 1–6.
     The power level reached in this first embodiment may
still be higher than necessary. Even after the access code
reaches the threshold detection level, the base station
requires time to “search through all possible phases (time
shifts) of the access code . . . in order to find the correct
phase.” Col. 6, lines 23–26. The amount of time required
to detect the correct phase depends on the length of the
access code; “[t]he longer the access code, the longer it
takes for the base station to search through the phases
and acquire the correct phase.” Col. 6, lines 27–29 (inter-
nal references omitted); see also col. 7, lines 18–25. And
during the time the base station is searching for the
INTERDIGITAL COMMUNICATIONS   v. ZTE CORPORATION          5

correct phase, the cell phone transmitter continues to
ramp up the power level at which it transmits the access
code. See col. 7, lines 26–34. The power level being used
when the base station completes its phase detection,
which is the level at which communications then occur,
thus exceeds the minimum threshold detection level,
which is the level at which the phase search began. See
col. 7, lines 18–34 & Fig. 5.
     The second embodiment, expressly deemed “the pre-
ferred embodiment,” further reduces power overshoot.
Col. 7, lines 41–44; compare Fig. 5 with Fig. 7. In the
second embodiment, rather than successively sending the
access code during initial power ramp-up, the transmitter
sends a “short code,” defined as “a sequence for detection
by the base station which has a much shorter period than
a conventional spreading code.” Col. 3, lines 23–25.
Because the short code is in fact short, the base station
needs less time to search for the correct phase and detect
the signal than in the first embodiment (for the longer
access code), thus decreasing the amount of power ramp
up that occurs during the search time. See col. 1, lines
28–31 (“[T]he transmission of short codes from [cell
phones] to a base station . . . reduce[s] the time required
for the base station to detect the signal from a [cell
phone].”); col. 8, lines 7–9 (“[T]he short code is much
smaller” and “can be chosen to be any length that is
sufficiently short to permit quick detection.”). The base
station sends an acknowledgment signal, after which the
cell phone begins transmitting the access code at a much
slower ramp-up rate, starting at the power level at which
the short code was detected. Col. 8, lines 32–42 & Figs.
6A, 6B, 11A, 11B. Once the base station detects the
access code, the base station sends another acknowledg-
ment signal, and the two-way communication link is set
up at that power level. Col. 8, line 66 through col. 9, line
6.
6         INTERDIGITAL COMMUNICATIONS   v. ZTE CORPORATION

                            B
    At issue on appeal is ZTE’s liability for infringement
of independent claim 1 and dependent claims 3, 6, 8, 9,
and 11 of the ’966 patent, and of independent claims 3
and 5 of the ’847 patent. Claim 1 of the ’966 patent and
claim 3 of the ’847 patent are representative: 2
   1. A wireless code division multiple access (CDMA)
subscriber unit comprising:
    a transmitter configured such that, when the sub-
        scriber unit is first accessing a CDMA network
        and wants to establish communications with a
        base station associated with the network over
        a communication channel to be indicated by
        the base station, the transmitter successively
        transmits signals until the subscriber unit re-
        ceives from the base station an indication that
        a transmitted one of the signals has been de-
        tected by the base station, wherein each
        transmission of one of the signals by the
        transmitter is at an increased power level with
        respect to a prior transmission of one of the
        signals;
    the transmitter further configured such that the
       transmitter transmits to the base station a
       message indicating to the base station that the
       subscriber unit wants to establish the commu-
       nication with the base station over the com-
       munication channel to be indicated by the base
       station, the message being transmitted only
       subsequent to the subscriber unit receiving the
       indication;

    2   On appeal, ZTE does not make separate argu-
ments as to the dependent claims or claim 5 of the ’847
patent.
INTERDIGITAL COMMUNICATIONS   v. ZTE CORPORATION            7

   wherein each of the successively transmitted sig-
     nals and the message are generated using a
     same code; and
   wherein each of the successively transmitted sig-
     nals is shorter than the message.
Col. 10, line 62 through col. 11, line 19 (emphases added).
   3. A wireless code division multiple access (CDMA)
subscriber unit comprising:
   a circuit configured to synchronize to a pilot signal
       transmitted by a base station associated with a
       CDMA network wherein, if the circuit becomes
       unsynchronized to the pilot signal during an
       idle period of the subscriber unit, the circuit is
       further configured to re-synchronize to the pi-
       lot signal;
   a transmitter configured such that, when the sub-
       scriber unit is first accessing the CDMA net-
       work, the transmitter successively transmits
       signals generated using a portion of a code un-
       til the subscriber unit receives from the base
       station an indication that a transmitted one of
       the signals has been detected by the base sta-
       tion, wherein each transmission of one of the
       signals by the transmitter, other than a
       transmission of a first one of the signals, is at
       an increased power level with respect to a prior
       transmission of another one of the signals;
   the transmitter further configured such that, sub-
      sequent to the subscriber unit receiving the in-
      dication, the transmitter transmits a signal
      generated using a remainder of the code;
   wherein prior to receiving the indication, the sub-
     scriber unit is not uniquely identified to the
     base station.
8         INTERDIGITAL COMMUNICATIONS    v. ZTE CORPORATION

’847 patent, col. 11, line 53 through col. 12, line 9 (empha-
sis added).
                             II
                             A
    The primary dispute on appeal is the proper construc-
tion of the claim term “successively transmits signals” or
“successively transmitted signals.” The district court
construed the term “code” as a “sequence of chips or bits,”
and it construed the disputed term “successively trans-
mits signals; successively transmitted signals” as “succes-
sively [transmits / transmitted] sequences of chips or
bits”—i.e., successively transmits / transmitted sequences
of code. InterDigital Commc’ns, Inc. v. ZTE Corp., No.
1:13-cv-00009, 2014 WL 1620733, at *2 (D. Del. Apr. 22,
2014). Because the district court did not make any factu-
al findings based on extrinsic evidence in the course of
construing the term “successively transmits signals;
successively transmitted signals,” we review the district
court’s claim construction de novo. Teva Pharms. USA,
Inc. v. Sandoz, Inc., 135 S. Ct. 831, 841 (2015); Cardsoft,
LLC v. VeriFone, Inc., 807 F.3d 1346, 1350 (Fed. Cir.
2015).
    ZTE contends that the proper construction of “succes-
sively transmitted signals” is “successively transmitted
sequences of chips or bits not modulated by a data signal.”
ZTE Br. 40. It relies on two premises—first, that “succes-
sively transmitted signals” refers only to the short codes
described in the specification; second, that the short codes
are not modulated by a data signal, which means that the
short codes do not carry data. See InterDigital I, 690 F.3d
at 1321, 1326 (explaining that spreading codes “carry”
data by modulating, or modifying, a baseband data sig-
nal). We reject ZTE’s first premise and therefore its claim
construction.
INTERDIGITAL COMMUNICATIONS     v. ZTE CORPORATION           9

     The “successively transmitted signals” in the claims
are the codes sent by the cell phone transmitter during
the initial power ramp-up phase. The specification de-
scribes two embodiments in great detail: one embodiment
in which the successively transmitted signals are the
access codes, col. 6, line 1 through col. 7, line 40 & Figs. 4,
5, and a second, preferred embodiment in which the
successively transmitted signals are the short codes, col.
7, line 41 through col. 9, line 35 & Figs. 6A, 6B, 7; col. 10,
lines 10–53 & Figs. 11A, 11B. The specification expressly
indicates that the invention is not limited to the preferred
embodiment. Col. 10, lines 54–57 (“Although the inven-
tion has been described in part by making detailed refer-
ence to the preferred embodiment, such detail is intended
to be instructive rather than restrictive.”). Although the
second embodiment is preferred and highlighted in the
background and summary of the invention sections, col. 1,
lines 27–31; col. 3, lines 19–23, we see no basis on which
to limit the claims to that embodiment when the plain
language of the claims in these patents, as well as the
specification, encompass both. Indeed, ZTE makes no
substantial argument based on the claim language and
specification for limiting the claim phrase at issue to the
short codes. 3
     ZTE relies instead on our earlier decision, InterDigital
II, 601 F. App’x 972, involving U.S. Patent Nos. 7,706,830
and 8,009,636—which, though they have materially the

    3   ZTE does not, for instance, argue that the claim
language “each of the successively transmitted signals is
shorter than the message” supports limiting the “succes-
sively transmitted signals” to short codes. In fact, ZTE
admits that even in the first embodiment, after the base
station detects the successively transmitted access code,
the cell phone then “transmits a ‘message’ to the base
station.” ZTE Br. 10 (citing Fig. 4 (box 116)).
10        INTERDIGITAL COMMUNICATIONS    v. ZTE CORPORATION

same specification as the ’966 and ’847 patents, have
notably different claims. In InterDigital II, the Interna-
tional Trade Commission first construed a phrase in the
’830 and ’636 patents, “successively sends [or sent] trans-
missions,” as “transmits to the base station, one after the
other, codes that are shorter than a regular length code.”
Id. at 977. The Commission then “conclud[ed] that the
patents ‘disclose that the codes successively transmitted
during the random access process (i.e., the short codes)
are neither modulated with data, nor used to modulate
data.’” Id. (quoting Commission’s decision).
    The first step in the Commission’s conclusion in In-
terDigital II is the one relevant here. The problem for
ZTE, however, is that this court in InterDigital II had no
occasion to rule on the correctness of the Commission’s
conclusion at that step, i.e., that the successively trans-
mitted signals were only short codes, even in the context
of the two patents at issue in InterDigital II. Although
InterDigital disputed that point before the Commission,
InterDigital did not dispute it before this court on appeal.
This court therefore assumed that the phrase in the
claims of those patents was limited to short codes, with-
out independent claim-construction analysis on the point;
and based on that assumption, it treated the claims at
issue as dealing with the preferred (short code + access
code) embodiment, not the first (access code only) embod-
iment. The question the court decided involved only the
Commission’s second step—whether “‘the Commission
erred in limiting the successively transmitted short codes
to codes not modulated by data.’” InterDigital II, 601 F.
App’x at 977 (quoting InterDigital’s brief) (internal quota-
tion marks omitted).
    Contrary to ZTE’s contention, therefore, InterDigital
II does not establish an answer to the issue presented
here, which was not contested or decided there. See, e.g.,
Automated Merchandising Sys., Inc. v. Lee, 782 F.3d 1376,
1381 (Fed. Cir. 2015); Lumbermens Mut. Cas. Co. v.
INTERDIGITAL COMMUNICATIONS    v. ZTE CORPORATION          11

United States, 654 F.3d 1305, 1317 n.10 (Fed. Cir. 2011);
United States v. Cty. of Cook, Ill., 170 F.3d 1084, 1088
(Fed. Cir. 1999). The court in InterDigital II did not
decide, but merely assumed, the issue of restriction to the
short-code embodiment, even as to the phrase in the
particular claims in the two patents at issue in InterDigi-
tal II. Moreover, the claims in the present case are differ-
ent from those in InterDigital II: surrounding claim
language can affect the interpretation of a claim phrase,
and the surrounding language differs between the Inter-
Digital II claims and the claims at issue here. ZTE has
not made any showing of the irrelevance of those differ-
ences. 4 For those reasons, InterDigital II does not decide
whether “successively transmitted signals” in the claims
of the patents at issue here are limited to short codes to
the exclusion of the first embodiment.
    Nor is InterDigital judicially estopped from arguing in
this case that the disputed term is not limited to short
codes. Judicial estoppel applies “where a party assumes a
certain position in a legal proceeding, and succeeds in
maintaining that position”; thereafter, “he may not . . . ,
simply because his interests have changed, assume a
contrary position, especially if it be to the prejudice of the
party who has acquiesced in the position formerly taken
by him.” Davis v. Wakelee, 156 U.S. 680, 689 (1895);

    4   For example, claim 1 of the ’830 patent, which In-
terDigital designated as the representative claim, Br. of
Appellants, InterDigital II, No. 14-1176, 2014 WL
1573071, at *9 (Fed. Cir., filed Apr. 7, 2014), and which
was the focus of this court’s discussion in InterDigital II,
requires that “at least two of the successively sent trans-
missions are produced using different sequences of chips,”
’830 patent, col. 11, lines 8–9, which appears to corre-
spond to a specification passage limited to the preferred
embodiment, id., col. 9, lines 8–29.
12        INTERDIGITAL COMMUNICATIONS    v. ZTE CORPORATION

accord New Hampshire v. Maine, 532 U.S. 742, 749
(2001). Here, it is true that InterDigital stated in its
opening brief in InterDigital II that “InterDigital agrees
that the only disclosure in the specification of ‘successive-
ly sent transmissions’ are ‘short codes.’” Br. of Appel-
lants, InterDigital II, No. 14-1176, 2014 WL 1573071, at
*24 (Fed. Cir., filed Apr. 7, 2014). But, regardless of
whether that statement must be read as contrary to
InterDigital’s position in this appeal, the statement does
not support judicial estoppel at least for the reason that
the statement did not lead to success by InterDigital.
This court proceeded on the premise accepted on appeal
by InterDigital and ruled against InterDigital’s challenge
on appeal. Judicial estoppel therefore does not apply.
    ZTE also suggests that, before appealing to this court
in InterDigital II, InterDigital admitted before the Com-
mission that “successively sent transmissions” referred
only to short codes. Not so. InterDigital disputed the
matter before the administrative law judge and the Com-
mission. And the testimony of InterDigital’s expert before
the Commission that “the repeated transmissions of the
short code are the successively sent transmissions” indi-
cates that short codes fall within the scope of that term,
not that the scope of the term is limited to short codes.
J.A. 10288. 5
    We conclude that “successively transmit / transmitted
signals” refers not only to the short codes of the preferred
embodiment but also to the access codes of the first em-

     5
         ZTE highlights several other purported admis-
sions by InterDigital that relate to InterDigital’s second
premise—i.e., that the short codes in the preferred embod-
iment carry data—but that do not support ZTE’s argu-
ment as to the first premise—i.e., that the disputed term
is limited to short codes, as in the preferred embodiment.
INTERDIGITAL COMMUNICATIONS       v. ZTE CORPORATION        13

bodiment. ZTE did not argue on appeal that the access
codes of the first embodiment do not modulate data, and
has therefore waived the argument that its proposed
limitation, “not modulated by a data signal,” would be
appropriate even if the disputed term is construed as not
limited to the preferred embodiment. For those reasons,
we affirm the district court’s construction.
                              B
     We review de novo the district court’s denial of judg-
ment as a matter of law, “viewing the record in the light
most favorable to . . . the verdict winner, and drawing all
reasonable inferences in [the winner’s] favor.” Pitts v.
Delaware, 646 F.3d 151, 155 (3d Cir. 2011). Judgment as
a matter of law is permitted only if “there is insufficient
evidence from which a jury could reasonably find liabil-
ity.” Lightning Lube, Inc. v. Witco Corp., 4 F.3d 1153,
1166 (3d Cir. 1993). “In determining whether the evi-
dence is sufficient to sustain liability, the court may not
weigh the evidence, determine the credibility of witnesses,
or substitute its version of the facts for the jury’s version.”
Id.; accord Pitts, 646 F.3d at 155.
    Many of the facts are undisputed. ZTE agrees that its
products comply with the 3rd Generation Partnership
Project (3GPP) telecommunications standard. According
to that standard, the cell phone transmitter generates at
least two types of signals: a physical random access
channel (PRACH) preamble, which is a scrambling code of
4,096 chips; and a PRACH message part, which is a
scrambling code of 38,400 chips. Both the PRACH pre-
amble code and the PRACH message code are generated
from the same theoretical long scrambling sequence
named clong,1,n.
    InterDigital’s infringement theory at trial was that
ZTE’s devices used the PRACH preamble code as the
“successively transmitted signal” for detection by the base
station, then used the PRACH message code as the sub-
14       INTERDIGITAL COMMUNICATIONS    v. ZTE CORPORATION

sequent transmission to the base station for identification
or to let the base station know that a two-way communi-
cation link is desired. ZTE argues here that, under that
theory, its products do not meet two claim limitations.
First, ZTE argues, the PRACH preamble and message are
not “generated using a same code” (claim 1 of the ’966
patent). Second, ZTE argues, it is not the case that the
PRACH preamble is “generated using a portion of a code”
and that the PRACH message is “generated using a
remainder of the code” (claim 3 of the ’847 patent). We
reject ZTE’s contention, concluding that the evidence
permitted the jury reasonably to find otherwise.
     The 2006 technical specification for the 3GPP stand-
ard, introduced as an exhibit at trial, explains that
(1) there are 8,192 PRACH scrambling codes “defined”
from the theoretical long scrambling sequence, clong,1,n,
and (2) each of those “defined” 8,192 PRACH scrambling
codes consists of 4,096 chips (preamble) plus 38,400 chips
(message). J.A. 8971–72. Design documents from Qual-
comm, which manufactures operative parts used in ZTE’s
products, were also introduced at trial and say substan-
tially the same thing. InterDigital’s infringement expert
relied on those design documents to conclude that the
PRACH preamble and message were generated using a
section of clong,1,n: a series of 4,096 chips is generated,
then a series of 38,400 chips “is simply continued from the
end of the preamble.” J.A. 7269. Based on that evidence,
a reasonable jury could find that the PRACH preamble
and message are generated from “a same code” or from “a
portion of a code” and from “a remainder of the code.”
    Contrary to ZTE’s argument, InterDigital’s invalidity
expert did not give testimony inconsistent with that
infringement finding.     InterDigital’s invalidity expert
testified that one cannot randomly select a series of chips
to serve as the preamble, then randomly select a series of
chips to serve as the message, and ultimately claim that
the preamble and message are part of a same code. He
INTERDIGITAL COMMUNICATIONS   v. ZTE CORPORATION         15

agreed with counsel that the two generated codes cannot
be retrospectively combined but that the “same code has
to be something which is somehow defined to be a se-
quence.” J.A. 8339. His testimony is consistent with the
Qualcomm documents, on which the infringement expert
relied, as well as the 3GPP technical specification. The
Qualcomm design documents explain that “the scram-
bling code for the [P]RACH message corresponds to the
same scrambling code that is used in the construction of
the [P]RACH preamble.” J.A. 8617. Similarly, according
to the 3GPP specification:
   The message part scrambling code has a one-to-
   one correspondence to the scrambling code used
   for the preamble part. For one PRACH, the same
   code number is used for both scrambling codes, i.e.
   if the PRACH preamble scrambling code used is
   St-pre,m, then the PRACH message part scrambling
   code is St-msg,m, where the number m is the same
   for both codes.”
J.A. 8972. The PRACH preamble and the message are
generated from a defined code—a portion of clong,1,n desig-
nated by, for example, “the number m.” Id.
    ZTE’s expert testified that the PRACH preamble and
message are not generated from “a same code,” or from a
“portion” and “remainder” of a code, because the preamble
and message are different codes, of different lengths,
generated at different times, and defined in different
sections of the 3GPP standard. J.A. 8040–41. He (and
ZTE) framed the issue as whether the mere fact that the
preamble and message are generated by the same code
generator was sufficient to find that the preamble and
message are part of a same code. J.A. 8066–67. But the
evidence, discussed above, shows that the preamble and
message are not merely generated by the same code
generator; they are generated one after the other from the
same sequence, with a “one-to-one correspondence.” J.A.
16       INTERDIGITAL COMMUNICATIONS   v. ZTE CORPORATION

8972. The jury was entitled to reject the testimony of
ZTE’s expert and rely on the testimony of InterDigital’s
experts, the 3GPP technical specification, and the Qual-
comm documents. We conclude that substantial evidence
supports the verdict of infringement.
                          III
    For the foregoing reasons, we affirm the district
court’s judgment.
                     AFFIRMED