1. 3GPP, 2013a. 3rd generation partnership project; technical specification group SA; feasibility study for proximity services (ProSe) (Release 12), TR 22.803 V12.2.0, June 2013.
2. 3GPP, 2011. 3GPP TSG Services and system aspects: local IP access and selected IP traffic offload (LIPA-SIPTO)(Release 10). 3GPP, Tech. Rep. TR 23.829, Aug, 2011.
3. 3GPP, 2014a. 3rd generation partnership project; technical specification group SA; study on architecture enhancements to support proximity services (ProSe) (Release 12), TR 23.703 V2.0.0, March 2014a.
4. 3GPP, 2013b. 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Group Communication System Enablers for LTE (GCSE LTE) (Release 12), TS 22.468 V12.0.0, June 2013b.
5. 3GPP, 2013c. 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Group Communication System Enablers for LTE (GCSE LTE) (Release 12). TS 22.468 V12.0.0, June 2013c.