1. TR 21.905: "Vocabulary for 3GPP Specifications"

2. TS 23.501 "5G System architecture for the 5G System (5GS)"

3. TS 28.532 "5G; Management and Orchestration; Generic Management Services"

This spec contains info about management services (including fault management, data reporting services, performance management etc.) 

4. TS 38.133 "5G NR; Requirements for support of radio resource management (RRM)"

5. TS 38.213 "5G NR; Physical layer procedures for control"

6. TS 38.214 "5G NR Physical layer procedures for data"

7. TS 38.300 "NR and NG-RAN Overall description"

The present document provides an overview and overall description of the NG-RAN and focuses on the radio interface protocol architecture of NR connected to 5GC (E-UTRA connected to 5GC is covered in the 36 series). Details of the radio interface protocols are specified in companion specifications of the 38 series.

8. TS 38.304: "5G NR; User Equipment (UE) procedures in Idle mode and RRC Inactive state".

9. TS 38.321 "5G NR Medium Access Control (MAC) protocol specification"

10. TS 38.322 "5G NR; Radio Link Control (RLC) protocol specification"

11. TS 38.331 "5G NR Radio Resource Control (RRC)"

Scope and topics:

• Procedures for MIB and SIB message transfer between UE and gNB

• Procedures for RRC Connection Control message transfer

• Procedures for other Radio Resource Control (RRC) Message transfer between UE and gNB

• Inquiry of UE Capbility

12. TS 38.401, "5G NG-RAN; Architecture Description"

13. TS 38.413  "5G NG-RAN; NG Application Protocol (NGAP)"

14. TS 38.415, "5G NG-RAN PDU Session User Plane Protocol"

15. TS 38.423 "5G NG-RAN; Xn Application Protocol (XnAP)".

16. TS 38.463 "5G NG-RAN ;E1 Application Protocol (E1AP)"

17. TS 38.473 "5G NG-RAN; F1 application protocol (F1AP)".