In The Unicode Standard, implementation of Sumero-Akkadian Cuneiform is discussed in  Chapter 11 Cuneiform and Hieroglyphs.

The Cuneiform script was encoded in The Unicode Standard version 5.0. The script is encoded in the following blocks:

Blocks Character Range Added in Unicode Version Unicode Chart
Cuneiform 12000..123FF 5.0  U12000.pdf
Cuneiform Numbers and Punctuation 12400..1247F 5.0  U12400.pdf
Early Dynastic Cuneiform 12480..1254F 8.0  U12480.pdf

Subsequent to version 5.0, the following characters have been added to the Cuneiform script:

CharactersUnicode VersionDocumentation
1236F..12398 7.0  WG2 N4277,  L2/12-207
12399 8.0  WG2 N4277,  L2/12-207
12463..1246E 7.0  WG2 N4277,  L2/12-207
12474 7.0  WG2 N4277,  L2/12-207
12480..12543 8.0  WG2 N4278,  L2/12-208

Documentation refers to  ISO Working Group and Unicode proposals

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

1992-10-30 Akkadian / Babylonian / Sumerian — Rick McGowan ( Unicode Technical Report #3 R2)

1999-07-23 Comments on proposals for the Universal Multiple-Octed Coded Character Set — Dr. W. Röllig (xlat. Küster) ( L2/99-224)

2000-02-15 Scripts from the Past in Future Versions of Unicode — Carl-Martin Bunz ( L2/00-128)

2000-04-26 Further comments on historic scripts — Carl-Martin Bunz ( L2/00-153)

2000-11-07 Cuneiform: From Clay Tablet to Computer — Dean A. Snyder ( L2/00-398)

2000-11-20 Legacy cuneiform font implementations and the ICE project — Michael Everson ( WG2 N2297,  L2/00-419)

2003-05-25 Basic principles for the encoding of Sumero-Akkadian Cuneiform — Michael Everson, Karljürgen Feuerherm ( WG2 N2585,  L2/03-162)

2003-11-01 Proposal to Encode the Sumero-Akkadian Cuneiform Script in the UCS — Dean Snyder (ICE) ( L2/03-415)

2003-11-03 Preliminary proposal to encode the Cuneiform script in the SMP of the UCS — Michael Everson, Karljürgen Feuerherm, Steve Tinney ( WG2 N2664,  L2/03-393)

2003-11-03 The Cuneiform Encoding Proposal — a View of its Current Status — Lloyd Anderson ( L2/03-416)

2004-01-24 Rationale for changes to N2664R — Steve Tinney ( L2/04-080)

2004-01-29 Revised proposal to encode the Cuneiform script in the SMP of the UCS — Michael Everson, Karljürgen Feuerherm, Steve Tinney ( WG2 N2698,  L2/04-036)

2004-01-29 Fitting Cuneiform Encoding to Cuneiform Script — Lloyd Anderson ( L2/04-041)

2004-01-30 Proposal to Encode Cuneiform Ideographic Descriptors — Dean A. Snyder ( L2/04-048)

2004-01-30 Short Response to L2/04-041 "Fitting Cuneiform Encoding to Cuneiform Script" — Karljuergen Feuerherm ( L2/04-059)

2004-01-30 Re: Cuneiform at UTC — Tom Gewecke ( L2/04-063)

2004-01-31 Letter re "Cuneiform Unicode" — Niek Veldhuis ( L2/04-056)

2004-02-01 Letter re "cuneiform" — Charles E. Jones ( L2/04-057)

2004-02-01 Letter re "cuneiform unicode" — Piotr Michalowski ( L2/04-058)

2004-02-01 Letter re "unicode proposal" — Jerry Cooper ( L2/04-064)

2004-02-02 Letter re "Proposal N2698" — Patrick Durusau ( L2/04-066)

2004-02-02 Examples of Cuneiform Ideographic Descriptor Usage — Dean Snyder ( L2/04-078)

2004-02-02 Letter re "cuneiform Unicode proposal" — Jeremy Black ( L2/04-081)

2004-06-08 Final proposal to encode the Cuneiform script in the SMP of the UCS — Michael Everson, Karljürgen Feuerherm, Steve Tinney ( WG2 N2786,  L2/04-189)

2004-09-20 Cuneiform Properties — Rick McGowan ( L2/04-354)

2005-05-10 N2786 Final Delta — Steve Tinney ( L2/05-135)

2005-07-28 Irish comments on Cuneiform — Michael Everson ( L2/05-174)

2005-10-06 Cuneiform property inconsistencies — Ken Whistler ( L2/05-289)

2012-01-26 Proposal for additions and corrections to Sumero-Akkadian Cuneiform — Michael Everson, Steve Tinney ( WG2 N4178,  L2/12-002)

2012-01-27 Preliminary proposal for Early Dynastic Cuneiform — Michael Everson, C. Jay Crisostomo ( WG2 N4179,  L2/12-024)

2012-06-06 Revert Cuneiform Numeric Changes for Unicode 6.2 — Ken Whistler ( L2/12-210)

2012-06-13 Proposal for Early Dynastic Cuneiform — Michael Everson, C. Jay Crisostomo, Steve Tinney ( WG2 N4278,  L2/12-208)

2012-07-26 Comments on L2/12-268 — Kent Karlsson ( L2/12-280)

2012-07-31 Proposal for additions and corrections to Sumero-Akkadian Cuneiform — Michael Everson, Steve Tinney ( WG2 N4277,  L2/12-207)

2012-11-08 Duplicate EARLY DYNASTIC CUNEIFORM character: U+124D2 CUNEIFORM SIGN KA TIMES U — Deborah Anderson ( L2/12-389)

2013-10-28 Request to add one Cuneiform character to the UCS — Michael Everson ( WG2 N4493,  L2/13-196)