In The Unicode Standard, Pau Cin Hau alphabet implementation is discussed in  Chapter 16 Southeast Asia.

The Pau Cin Hau alphabet was encoded in The Unicode Standard version 7.0. The script is now encoded in the following block:

BlocksCharacter RangeAdded in Unicode VersionUnicode chart
Pau Cin Hau 11AC0..11AFF 7.0  U11AC0.pdf

A number of proposals for its inclusion have been submitted to the Unicode Technical Committee and WG2:

2010-02-28 Preliminary Proposal to Encode the Pau Cin Hau Script in ISO/IEC 10646 — Anshuman Pandey ( WG2 N3781,  L2/10-080)

2010-05-22 Defining Properties for Tone Marks of the Pau Cin Hau Script — Anshuman Pandey ( WG2 N3784,  L2/10-092)

2010-07-26 Allocating the Pau Cin Hau Scripts in the Unicode Roadmap — Anshuman Pandey ( WG2 N3865,  L2/10-073)

2010-10-27 Preliminary Proposal to Encode the Pau Cin Hau Alphabet in ISO/IEC 10646 — Anshuman Pandey ( WG2 N3960,  L2/10-437)

2011-04-27 Proposal to Encode the Pau Cin Hau Alphabet in ISO/IEC 10646 — Anshuman Pandey ( WG2 N4017,  L2/11-104)

2011-07-25 Proposal to Change the Names for Some Pau Cin Hau Characters — Anshuman Pandey ( WG2 4129,  L2/11-287)