我寫這篇文章是受到下面這篇文章的啟發
http://winnielee0204.blogspot.tw/2008/10/3gpp-specification.html
因為每個人研究的東西都不一樣，所以我覺得還是自己整理一份屬於我的3GPP文件列表比較好。
基本知識：
1. 23.002 Network architecture：描述GSM、UMTS、LTE的網路架構與介面。雖然只有一些基本簡介，但是卻提供很多reference讓讀者可以進一步查詢細節。
2. 23.009 Handover Procedure： 描述GSM與UMTS的Handover訊息流程。
3. 23.205 Bearer-independent circuit-switched core network; Stage 2：描述circuit-switched網路的Call Setup、Handover的程序，就是IAM、ACM、ANM那些SS7訊息。
4. 23.018 Basic call handling; Technical realization：描述call setup的訊息流程，以及在核心網路各元件的處理流程
5. 23.003 Numbering, addressing and identification：說明在電信網路會用到的數字或ID的格式，例如IMSI、LAI、GUTI。
6. 23.228 IP Multimedia Subsystem (IMS); Stage 2：描述IMS的基本文件
7. 21.905 Vocabulary for 3GPP Specifications：列出3GPP文件的專有名詞意義與縮寫的全名
LTE重要文件：
1. 23.401 General Packet Radio Service (GPRS) enhancements for
Evolved Universal Terrestrial Radio Access Network (E-UTRAN)
access：描述LTE核心網路架構與protocol stack
2. 36.300 Evolved Universal Terrestrial Radio Access (E-UTRA) and
Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall
description;Stage 2 ：描述E-UTRAN
UMTS重要文件：
1. 23.060 General Packet Radio Service (GPRS); Service Description; Stage 2：描述GPRS
2. 25.401 UTRAN overall description：描述UTRAN
Protocol方面：
1. 25.331 Radio Resource Control (RRC); Protocol specification：RRC是UE與UTRAN溝通的control plane protocol。這篇有詳細說明每個訊息內的欄位。
2. 23.108 Mobile radio interface layer 3 specification, core network protocols; Stage 2：描述在LTE與UMTS，UE與基地台之間的訊息流程，例如：Paging, Location Update, Call Setup
3. 24.008 Mobile radio interface Layer 3 specification; Core network protocols; Stage 3：是23.108的進階版，詳細說明訊息內的欄位。
4. 48.008 Mobile Switching Centre - Base Station System (MSC-BSS) interface; Layer 3 specification：就是MSC與BSS之間的protocol，包含詳細欄位說明。
5. 25.413 UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling：Iu是UTRAN與核心網路溝通的protocol，例如paging, relocation required等訊息。本文件有詳細描述訊息欄位內容。
6. 24.301 Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3：NAS是UE與核心網路溝通的control plane protocol。
7. 29.118 Mobility Management Entity (MME) – Visitor Location Register (VLR) SGs interface specification：MME與VLR的protocol。
8. 36.413 Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP)：S1是eNB與MME溝通的protocol
9. 36.423 Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 application protocol (X2AP)：X2是eNB之間的protocol
10. 36.331 Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification：LTE版的25.331
Femtocell（又稱Home NodeB）：
1. 25.467 UTRAN architecture for 3G Home Node B (HNB); Stage 2：這篇說明在UMTS的Home NodeB架構。
2. 22.220 Service requirements for Home NodeBs and Home eNodeBs：一些Home NodeBs/eNodeBs 基礎介紹
3. 25.468 UTRAN Iuh Interface RANAP User Adaption (RUA) signalling：Iuh是HNB與HNB Gateway之間的protocol。
4. 25.469 UTRAN Iuh interface Home Node B Application Part (HNBAP) signalling：Iuh是HNB與HNB Gateway之間的protocol。這篇有訊息內詳細欄位說明。
Presence Service：
1. 22.141 Presence service; Stage 1：描述Presence service的一些基本介紹
2. 23.141 Presence service; Architecture and functional description：描述Presence Service的架構與訊息流程
3. 24.141 Presence service using the IP Multimedia (IM) Core Network (CN) subsystem; Stage 3：有詳細Presence Service在IMS的訊息流程與封包內容
Call Forwarding Service：
1. 22.082 Call Forwarding (CF) supplementary services - Stage 1：描述Call forwarding service。
2. 23.082 Call Forwarding (CF) supplementary services; Stage 2：比22.082多一些細節
3. 24.082 Call Forwarding (CF) supplementary services; Stage 3：比23.082多一些細節
SRVCC/eSRVCC：
1. 23.216 Single Radio Voice Call Continuity (SRVCC); Stage 2：描述SRVCC的訊息流程
2. 23.237 IP Multimedia Subsystem (IMS) Service Continuity; Stage 2：描述eSRVCC訊息流程
3. 24.237 IP Multimedia Subsystem (IMS) Service Continuity; Stage 3：比23.237還要詳細，提供訊息內容範例
4. 23.292 IP Multimedia Subsystem (IMS) centralized services; Stage 2：提供SCC AS、MSC Server, IMS彼此之間互動的訊息流程
5. 24.292 IP Multimedia (IM) Core Network (CN) subsystem Centralized Services (ICS); Stage 3：比23.292詳細一點
CS fallback：
1. 23.272 Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2：描述在LTE如何CS fallback到UMTS。
Short Message Service：
1. 23.040 Technical realization of the Short Message Service (SMS)：說明簡訊如何實做
2. 23.204 Support of Short Message Service (SMS) over generic 3GPP Internet Protocol (IP) access; Stage 2：說明傳統簡訊如何在IP傳遞
3. 24.341 Support of SMS over IP networks; Stage 3：23.204的詳細版
4. 24.011 Point-to-Point (PP) Short Message Service (SMS) support on mobile radio interface：簡訊的protocol細節
Supplementary services：
1. 22.004 General on supplementary services：supplementary services簡介
2. 22.030 Man-Machine Interface (MMI) of the User Equipment (UE)：說明哪些按鈕會觸發supplementary services。例如輸入「**21*031111111#」會觸發call forwarding service。
3. 23.011 Technical realization of Supplementary Services：比22.004還要多一點點supplementary services細節
4. 24.010 Supplementary services specification; General aspects：描述supplementary service的相關資訊
5. 24.080 Mobile radio interface layer 3 supplementary services specification; Formats and coding：詳細描述訊息內的欄位
6. 29.011 Signalling interworking for supplementary services：描述protocol之間互動的內容
其他：
1. 23.012 Location management procedures：描述GSM與UMTS的Location Update與Attach/Detach在MSC, VLR, HLR等程序。
2. 23.236 Intra-domain connection of Radio Access Network (RAN)
nodes to multiple Core Network (CN) nodes：描述MSC pool, SGSN pool來做到load balancing
3. 23.041 Technical realization of Cell Broadcast Service (CBS)：Cell Broadcast Service是用在防災之類的用途
以下網站也可以查詢到各種protocol的3GPP文件:
http://lteworld.org/lte-protocols-specifications
