-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0000354913-07-000022.txt : 20070104
<SEC-HEADER>0000354913-07-000022.hdr.sgml : 20070104
<ACCEPTANCE-DATETIME>20070104163301
ACCESSION NUMBER:		0000354913-07-000022
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20070101
FILED AS OF DATE:		20070104
DATE AS OF CHANGE:		20070104

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			LEMMO MARK A
		CENTRAL INDEX KEY:			0001193108

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-11152
		FILM NUMBER:		07509914

	MAIL ADDRESS:	
		STREET 1:		781 THIRD AVENUE
		CITY:			KING OF PRUSSIA
		STATE:			PA
		ZIP:			194061409

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			INTERDIGITAL COMMUNICATIONS CORP
		CENTRAL INDEX KEY:			0000354913
		STANDARD INDUSTRIAL CLASSIFICATION:	PATENT OWNERS & LESSORS [6794]
		IRS NUMBER:				231882087
		STATE OF INCORPORATION:			PA
		FISCAL YEAR END:			1206

	BUSINESS ADDRESS:	
		STREET 1:		781 THIRD AVE
		CITY:			KING OF PRUSSIA
		STATE:			PA
		ZIP:			19406-1409
		BUSINESS PHONE:		6108787800

	MAIL ADDRESS:	
		STREET 1:		781 THIRD AVE
		CITY:			KING OF PRUSSIA
		STATE:			PA
		ZIP:			19406-1409

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INTERNATIONAL MOBILE MACHINES CORP
		DATE OF NAME CHANGE:	19920703
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
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    <periodOfReport>2007-01-01</periodOfReport>

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        <issuerName>INTERDIGITAL COMMUNICATIONS CORP</issuerName>
        <issuerTradingSymbol>IDCC</issuerTradingSymbol>
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            <rptOwnerCity>KING OF PRUSSIA,</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19406-1409</rptOwnerZipCode>
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            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Sr. Bus. Development Officer</officerTitle>
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                    <value>By 401(k) Plan</value>
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    <derivativeTable>
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            <securityTitle>
                <value>Option (Right-to-Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>5.19</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2007-01-03</value>
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                <transactionAcquiredDisposedCode>
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            <expirationDate>
                <value>2010-12-26</value>
            </expirationDate>
            <underlyingSecurity>
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            <transactionDate>
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                    <value>0</value>
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                    <value>D</value>
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                <value>2000-12-28</value>
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                </natureOfOwnership>
            </ownershipNature>
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                <value>2007-01-03</value>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>M</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
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                <transactionShares>
                    <value>2000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <value>2000-12-29</value>
            </exerciseDate>
            <expirationDate>
                <value>2010-12-29</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2000</value>
                </underlyingSecurityShares>
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                    <value>0</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
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        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Granted pursuant to the InterDigital Communications Corporation 1999 Restricted Stock Plan in accordance with the Company's Long Term Compensation Program.</footnote>
        <footnote id="F2">The sales of Common Stock reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 21, 2006.</footnote>
        <footnote id="F3">As of the most recently published account statement dated December 29, 2006, the Reporting Person beneficially owned 1,767 shares of Common Stock pursuant to the InterDigital Communications Corporation Savings and Protection Plan.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Lisa Axt Alexander, Attorney-In-Fact for Mark A. Lemmo</signatureName>
        <signatureDate>2007-01-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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