National Public Safety Telecommunications Council
3rd Generation Partnership Project (3GPP)
This group continues to examine the international standards development and how this will affect domestic public safety operations.  NPSTC supports a single global standard for public safety in LTE.  There is a concern that two or more groups of standards could be developed.  European commercial groups have also announced their plan to create a European LTE standard.
About 3GPP from ...
"The 3rd Generation Partnership Project (3GPP) unites [Seven] telecommunications standard development organizations (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC), known as "Organizational Partners" and provides their members with a stable environment to produce the Reports and Specifications that define 3GPP technologies."
"The project covers cellular telecommunications network technologies, including radio access, the core transport network, and service capabilities – including work on codecs, security, quality of service – and thus provides complete system specifications.  The specifications also provide hooks for non-radio access to the core network, and for interworking with Wi-Fi networks."
"3GPP specifications and studies are contribution-driven, by member companies, in Working Groups and at the Technical Specification Group level."
For more background on 3GPP, go to their website.