1. 3GPP(2009).TS 23.830: architecture aspects of home nodeB and home eNodeB.http://www.3gpp.org(accessed 8 August 2019).
2. 3GPP(2014).TR 36.843: study on LTE device to device proximity services; Radio aspects (Release 12).http://www.3gpp.org(accessed 15 June 2019).
3. 3GPP(2016).RP‐161303: further enhancements to LTE device to device UE to network relays for IoT and wearables. 3GPP Busan Koreahttp://www.3gpp.org(accessed 16 June 2019).
4. 3GPP(2018a).TR 38.912: study on new radio (NR) access technology.http://www.3gpp.org(accessed 15 July 2019).
5. 3GPP(2018b).TR 36.746: study on further enhancements to LTE device to device (D2D).http://www.3gpp.org(accessed 15 June 2019).