3GPP Radio Resource Control
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+
+GENERAL INFORMATION
+===================
+
+The 3GPP TS 25.331 RRC (Radio Resource Control) PER decoder.
+Invoking `make` will compile the ASN.1 specifications from the
+../rrc.asn1 file.
+
+THERE IS NO rrc.asn1 FILE THERE YET!
+
+OBTAINING THE RRC SPECIFICATION
+================================
+
+Due to licensing restrictions, asn1c can not include the RRC ASN.1 module
+in its distribution.
+
+To obtain the RRC ASN.1 specification, you should go to
+ http://www.3gpp.org/ftp/Specs/html-info/25331.htm
+and download any version of RRC specification (preferably 7.1.0, 2006-06).
+
+A .ZIP file with a Microsoft Word .DOC files will download shortly.
+
+You should extract the ASN.1 modules from the chapter 11 of that .DOC file,
+and save it as the ../rrc.asn1 file. The ../rrc.asn1 file should start with
+the following line
+ "Class-definitions DEFINITIONS AUTOMATIC TAGS ::="
+and end with the "END" token.
+Be careful not to copy any preambles, chapter titles and other non-ASN.1 text.
+
+After obtaining the rrc.asn1, type `make` in the directory containing
+this README file.
+
+rrc-dump USAGE
+==============
+
+The rrc-dump utility may be used to dump the contents of a PER-encoded
+RRC protocol data unit. Since RRC specification contains multiple PDUs,
+a PDU must be selected manually using -p <PDU> command line option:
+
+ ./rrc-dump -p DL-DCCH-Message message.per
+ ./rrc-dump -p PCCH-Message message.per
+
+The list of recognized PDUs may be obtained using `-p list`.
+
+The full list of recognized command line options may be obtained with
+
+ > ./rrc-dump -h
+