NB-IoT系列協議--3GPP--Release 16--TS 36.300--總體描述;階段2
1.範圍
本文檔提供了E-UTRAN(Evolved Universal Terrestrial Radio Access Network)無線電接口協議體系結構的概述和總體描述。無線電接口協議的細節在36系列的規格中指定。對於涉及E-URAN的多連接,相對於E-UTRA和E-UTRAN的差異在3GPP TS 37.340[76]中指定。
2.定義
名稱 | 含義 |
---|---|
Access Control | 檢查一個UE是否被允許訪問一個封閉單元中的服務並被授予服務的過程。 |
Aerial UE communication | 啓用天線UE功能。 |
Anchor carrier | 在 NB-IoT中,UE假設FDD傳輸的NPSS/NSSS/NPBCH/SIB-NB或TDD傳輸的NPSS/NSSS/NPBCH的一種載體。 |
Carrier frequency | 單元的中心頻率。 |
Cell | 下行和可選上行資源的組合。下行資源的載波頻率與上行資源的載波頻率之間的連接在下行資源上傳輸的系統信息中表示。 |
Cell Group | 在雙連通性中,與MeNB或SeNB相關的一組服務單元。 |
CHO candidate cell | CHO的候選單元,UE爲其配置了CHO配置。 |
Conditional Handover (CHO) | 一種切換過程,僅在滿足配置的執行條件時執行。 |
Control plane CIoT 5GS Optimisation | 支持通過AMF在控制平面上高效傳輸用戶數據(IP、以太網和非結構化)或SMS消息,而不觸發用戶平面資源建立,如TS 24.501[91]所定義的。在本規範的上下文中,只支持控制平面CIoT 5GS優化的窄帶物聯網UE不支持用戶平面CIoT 5GS優化和NG-U數據傳輸,但可能支持其他CIoT 5GS優化。 |
Control plane CIoT EPS optimisation | 支持通過MME在控制平面上有效傳輸用戶數據(IP、非IP或SMS),而無需觸發數據無線承載機構的建立,如TS 24.301[20]中所定義的。在本規範的上下文中,僅支持控制平面CIoT EPS優化的窄帶物聯網UE是不支持用戶平面CIoT EPS優化和S1-U數據傳輸,但可能支持其他CIoT EPS優化的UE。 |
CSG Cell | 廣播設置爲true的CSG指示器和特定CSG標識的單元。 |
CSG ID Validation | 檢查通過切換消息接收到的CSG ID是否與目標E-UTRAN廣播的CSG ID相同。 |
CSG member cell | 廣播所選PLMN、註冊PLMN或等效PLMN的標識的小區,UE的CSG白名單包括一個包含小區CSG ID和相應PLMN標識的條目。 |
DAPS Handover | 一個切換過程,在接收到用於切換的RRC消息後維護源eNB連接,直到成功隨機訪問目標eNB後釋放源單元爲止。 |
DCN-ID | DCN標識標識特定的專用核心網絡(DCN)。 |
Dual Connectivity | RRC_CONNECTED中UE的操作方式,配置爲主單元組和輔助單元組。 |
en-gNB | 在Option3系列的非獨立(NSA)組網架構下,和4G核心網對接的5G基站,就叫en-gNB。 |
E-RAB | 一個E-RAB唯一地標識一個S1持有者和相應的數據無線持有者的連接。當一個E-RAB存在時,在這個E-RAB和一個在[17]中定義的非存取層的EPS載體之間有一個一對一的映射。 |
FeMBMS | 進一步增強多媒體廣播多播服務。 |
FeMBMS/Unicast-mixed cell | 支持MBMS傳輸和單播傳輸的小區作爲SCell。 |
Handover | 改變RRC_CONNECTED中UE的服務單元的過程。 |
Hybrid cell | 廣播設置爲假的CSG指示器和特定CSG標識的單元。 |
LTE bearer | 在LTE-WLAN聚合中,一種無線協議位於eNB中僅用於使用eNB無線電資源的承載者。 |
LWA bearer | 在LTE-WLAN聚合技術中,一種無線協議同時位於eNB和WLAN中以同時使用eNB和WLAN資源的承載者。 |
LWAAP PDU | 在LTE-WLAN聚合中,LWAAP實體生成的一種具有DRB ID的PDU,用於在WLAN上傳輸。 |
Make-Before-Break HO/SeNB change | 在SeNB切換或更改過程中,在初始上行傳輸到目標eNB之前,在接收到用於切換或更改SeNB的RRC消息後,維護源eNB/SeNB連接。 |
Master Cell Group | 在雙連通性中,與MeNB相關聯的一組服務單元,由PCell和一個或多個SCells組成。 |
Master eNB | 在雙連通性中,至少終止S1-MME的eNB。 |
MBMS-dedicated cell | 小區專用於MBMS傳輸。 |
MBMS/Unicast-mixed cell | 單元支持單播和MBMS傳輸。 |
MCG bearer | 在雙連通性中,一種無線協議僅位於MeNB以僅使用MeNB資源的承載者。 |
Membership Verification | 檢查UE是否是混合單元的成員或非成員的過程。 |
Multi-Connectivity | 在連接模式下,多個Rx/Tx UE被配置爲利用E-UTRA和/或NR之間的無線電資源,這些無線電資源由多個不同的調度器通過非理想的回程連接而提供。 |
NB-IoT | 窄帶物聯網允許通過E-UTRA以200 kHz的信道帶寬訪問網絡服務。 |
NB-IoT UE | 一個使用窄帶物聯網的UE |
ng-eNB | 節點向UE提供E-UTRA用戶平面和控制平面協議終端,並通過NG接口連接到5GC。 |
Non-anchor carrier | 在窄帶物聯網中,UE不假定傳輸FDD的NPSS/NSSS/NPBCH/SIB-NB或TDD的NPSS/NSSS/NPBCH的一種載體。 |
NR | NR無線電訪問 |
NR sidelink communication | 作爲一種功能,使用NR技術,在兩個或多個相鄰節點之間,使用TS 23.287[93]中定義的至少V2X通信,但不遍歷任何網絡節點。 |
PLMN ID Check | 檢查PLMN ID是UE的RPLMN標識還是EPLMN標識的過程。 |
Primary PUCCH group | 一組服務單元,包括PCell,其PUCCH信號與PCell上的PUCCH相關。 |
Primary Timing Advance Group | 包含PCell的定時推進組。在本規範中,除非另有明確說明,主定時推進組也指包含PSCell的定時推進組。 |
ProSe-enabled Public Safety UE | 一個UE, HPLMN已配置爲爲公共安全使用而授權 |
ProSe Per-Packet Priority | 與協議數據單元相關聯的標量值,定義爲該協議數據單元的傳輸應用的優先級處理。 |
ProSe UE-to-Network Relay | 一個UE,提供支持遠程UE連接到網絡的功能。 |
ProSe UE-to-Network Relay Selection | 識別一個潛在的路由到網絡中繼的過程,它可以用於連接服務(例如與PDN通信)。 |
ProSe UE-to-Network Relay Reselection | 改變以前選擇的ProSe UE-to-Network中繼和識別潛在的新的ProSe UE-to-Network中繼的過程,它可以被用於連接服務(例如與PDN通信)。 |
Public Safety ProSe Carrier | 載波頻率用於公共安全側通信和公共安全側發現。 |
PUCCH group | 主PUCCH組或次PUCCH組 |
PUCCH SCell | 一個二次單元配置了PUCCH |
RACH-less HO/SeNB change | 在切換或更改SeNB時跳過隨機訪問程序。 |
Receive Only Mode | See TS 23.246 [48]. |
Remote UE | 一種基於ProSe-enabled的公共安全UE,通過ProSe UE-to-Network的中繼與PDN通信。 |
SCG bearer | 在雙連通性中,爲了使用SeNB資源,無線協議僅位於SeNB中的承載者。 |
Secondary Cell Group | 在雙連通性中,與SeNB相關聯的一組服務單元,由PSCell和一個或多個scell(可選)組成。 |
Secondary eNB | 在雙連通性中,爲UE提供額外無線電資源但不是主eNB的eNB。 |
Secondary PUCCH group | a group of SCells whose PUCCH signalling is associated with the PUCCH on the PUCCH SCell.一組SCells PUCCH |
Secondary Timing Advance Group | 定時推進組不包含PCell和PSCell |
Short Processing Time | 對於1毫秒的TTI長度,在UL數據傳輸和DL數據接收中具有較短處理時間的操作。 |
Short TTI | 基於slot或subslot的TTI長度 |
Sidelink | UE to UE接口,用於服務器側通信、V2X側通信和側發現。旁線對應於TS 23.303[62]中定義的PC5接口。 |
Sidelink Control period | 在單元中分配資源用於輔助控制信息和輔助數據傳輸的週期。 |
Sidelink communication | 使用E-UTRA技術,但不遍歷任何網絡節點 |
Sidelink discovery | 使用E-UTRA技術但不遍歷任何網絡節點。 |
Split bearer | 在雙連通性中,一種無線協議同時位於MeNB和SeNB中以同時使用MeNB和SeNB資源的承載者。 |
Split LWA bearer | 在LTE-WLAN聚合中,一種無線協議同時位於eNB和WLAN中以同時使用eNB和WLAN無線電資源的承載者。 |
Switched LWA bearer | 在LTE-WLAN聚合中,無線協議同時位於eNB和WLAN但只使用WLAN無線電資源的承載者。 |
Timing Advance Group | 由RRC配置的一組服務單元,對於配置了UL的單元,使用相同的定時參考單元和相同的定時推進值。 |
User plane CIoT 5GS Optimisation | 支持從5GMM-IDLE模式更改爲5GMM-CONNECTED模式,而不需要使用服務請求過程。 |
User plane CIoT EPS optimisation | 支持從EMM-IDLE模式更改爲EMM-CONNECTED模式 |
WLAN Termination | 在WLAN端終止Xw接口的邏輯節點。 |
3.縮寫
縮寫 | 全稱 |
---|---|
1xCSFB | Circuit Switched Fallback to 1xRTT |
5GC | 5G Core Network |
ABS | Almost Blank Subframe |
AC | Access Category |
ACK | Acknowledgement |
ACLR | Adjacent Channel Leakage Ratio |
AM | Acknowledged Mode |
AMBR | Aggregate Maximum Bit Rate |
ANDSF | Access Network Discovery and Selection Function |
ANR | Automatic Neighbour Relation |
ARP | Allocation and Retention Priority |
ARQ | Automatic Repeat Request |
AS | Access Stratum |
AUL | Autonomous Uplink |
BCCH | Broadcast Control Channel |
BCH | Broadcast Channel |
BL | Bandwidth reduced Low complexity |
BR-BCCH | Bandwidth Reduced Broadcast Control Channel |
BSR | Buffer Status Report |
C/I | Carrier-to-Interference Power Ratio |
CA | Carrier Aggregation |
CAZAC | Constant Amplitude Zero Auto-Correlation |
CBC | Cell Broadcast Center |
CC | Component Carrier |
CG | Cell Group |
CHO | Conditional Handover |
CIF | Carrier Indicator Field |
CIoT | Cellular Internet of Things |
CMAS | Commercial Mobile Alert Service |
CMC | Connection Mobility Control |
C-plane | Control Plane |
C-RNTI | Cell RNTI |
CoMP | Coordinated Multi Point |
CP | Cyclic Prefix |
CQI | Channel Quality Indicator |
CRC | Cyclic Redundancy Check |
CRE | Cell Range Extension |
CRS | Cell-specific Reference Signal |
CSA | Common Subframe Allocation |
CSG | Closed Subscriber Group |
CSI | Channel State Information |
CSI-IM | CSI interference measurement |
CSI-RS | CSI reference signal |
DAPS | Dual Active Protocol Stack |
DC | Dual Connectivity |
DCCH | Dedicated Control Channel |
DCN | Dedicated Core Network |
DeNB | Donor eNB |
DFTS | DFT Spread OFDM |
DL | Downlink |
DMTC | Discovery Signal Measurement Timing Configuration |
DRB | Data Radio Bearer |
DRS | Discovery Reference Signal |
DRX | Discontinuous Reception |
DTCH | Dedicated Traffic Channel |
DTX | Discontinuous Transmission |
DwPTS | Downlink Pilot Time Slot |
E-CID | Enhanced Cell-ID (positioning method) |
E-RAB | E-UTRAN Radio Access Bearer |
E-UTRA | Evolved UTRA |
E-UTRAN | Evolved UTRAN |
EAB | Extended Access Barring |
ECGI | E-UTRAN Cell Global Identifier |
ECM | EPS Connection Management |
EDT | Early Data Transmission |
EHC | Ethernet Header Compression |
eHRPD | enhanced High Rate Packet Data |
eIMTA | Enhanced Interference Management and Traffic Adaptation |
EMM | EPS Mobility Management |
eNB | E-UTRAN NodeB |
EPC | Evolved Packet Core |
EPDCCH | Enhanced Physical Downlink Control Channel |
EPS | Evolved Packet System |
ETWS | Earthquake and Tsunami Warning System |
FDD | Frequency Division Duplex |
FDM | Frequency Division Multiplexing |
G-RNTI | Group RNTI |
GBR | Guaranteed Bit Rate |
GERAN | GSM EDGE Radio Access Network |
GNSS | Global Navigation Satellite System |
GP | Guard Period |
GRE | Generic Routing Encapsulation |
GSM | Global System for Mobile communication |
GUMMEI | Globally Unique MME Identifier |
GUTI | Globally Unique Temporary Identifier |
GWCN | GateWay Core Network |
GWUS | Group Wake Up Signal |
H-SFN | Hyper System Frame Number |
HARQ | Hybrid ARQ |
(H)eNB | eNB or HeNB |
HO | Handover |
HPLMN | Home Public Land Mobile Network |
HRPD | High Rate Packet Data |
HSDPA | High Speed Downlink Packet Access |
ICIC | Inter-Cell Interference Coordination |
IDC | In-Device Coexistence |
IP | Internet Protocol |
ISM | Industrial, Scientific and Medical |
KPAS | Korean Public Alert System |
L-GW | Local Gateway |
LAA | Licensed-Assisted Access |
LB | Load Balancing |
LBT | Listen Before Talk |
LCG | Logical Channel Group |
LCR | Low Chip Rate |
LCS | LoCation Service |
LHN | Local Home Network |
LHN ID | Local Home Network ID |
LIPA | Local IP Access |
LMU | Location Measurement Unit |
LPPa | LTE Positioning Protocol Annex |
LTE | Long Term Evolution |
LWA | LTE-WLAN Aggregation |
LWAAP | LTE-WLAN Aggregation Adaptation Protocol |
LWIP | LTE WLAN Radio Level Integration with IPsec Tunnel |
LWIP-SeGW | LWIP Security Gateway |
MAC | Medium Access Control |
MBMS | Multimedia Broadcast Multicast Service |
MBR | Maximum Bit Rate |
MBSFN | Multimedia Broadcast multicast service Single Frequency Network |
MCCH | Multicast Control Channel |
MCE | Multi-cell/multicast Coordination Entity |
MCG | Master Cell Group |
MCH | Multicast Channel |
MCS | Modulation and Coding Scheme |
MDT | Minimization of Drive Tests |
MeNB | Master eNB |
MGW | Media Gateway |
MIB | Master Information Block |
MIMO | Multiple Input Multiple Output |
MME | Mobility Management Entity |
MMTEL | Multimedia telephony |
MO-EDT | Mobile Originated Early Data Transmission |
MPDCCH | MTC Physical Downlink Control Channel |
MSA | MCH Subframe Allocation |
MSI | MCH Scheduling Information |
MSP | MCH Scheduling Period |
MT-EDT | Mobile Terminated Early Data Transmission |
MTC | Machine-Type Communications |
MTCH | Multicast Traffic Channel |
MTSI | Multimedia Telephony Service for IMS |
N2 | Reference point between the NG-RAN and the AMF |
NACK | Negative Acknowledgement |
NAS | Non-Access Stratum |
NB-IoT | Narrow Band Internet of Things |
NCC | Next Hop Chaining Counter |
NCGI | NR Cell Global Identifier |
NCR | Neighbour Cell Relation |
NG-RAN | NG Radio Access Network |
NH | Next Hop key |
NNSF | NAS Node Selection Function |
NPBCH | Narrowband Physical Broadcast channel |
NPDCCH | Narrowband Physical Downlink Control channel |
NPDSCH | Narrowband Physical Downlink Shared channel |
NPRACH | Narrowband Physical Random Access channel |
NPUSCH | Narrowband Physical Uplink Shared channel |
NPRS | Narrowband Positioning Reference Signal |
NPSS | Narrowband Primary Synchronization Signal |
NR | NR Radio Access |
NRT | Neighbour Relation Table |
NSSS | Narrowband Secondary Synchronization Signal |
OFDM | Orthogonal Frequency Division Multiplexing |
OFDMA | Orthogonal Frequency Division Multiple Access |
OPI | Offload Preference Indicator |
OTDOA | Observed Time Difference Of Arrival (positioning method) |
P-GW | PDN Gateway |
P-RNTI | Paging RNTI |
PA | Power Amplifier |
PAPR | Peak-to-Average Power Ratio |
PBCH | Physical Broadcast CHannel |
PBR | Prioritised Bit Rate |
PCC | Primary Component Carrier |
PCCH | Paging Control Channel |
PCell | Primary Cell |
PCFICH | Physical Control Format Indicator CHannel |
PCH | Paging Channel |
PCI | Physical Cell Identifier |
PDCCH | Physical Downlink Control CHannel |
PDCP | Packet Data Convergence Protocol |
PDN | Packet Data Network |
PDSCH | Physical Downlink Shared CHannel |
PDU | Protocol Data Unit |
PHICH | Physical Hybrid ARQ Indicator CHannel |
PHY | Physical layer |
PLMN | Public Land Mobile Network |
PMCH | Physical Multicast CHannel |
PMK | Pairwise Master Key |
PPPP | ProSe Per-Packet Priority |
PPPR | ProSe Per-Packet Reliability |
PRACH | Physical Random Access CHannel |
PRB | Physical Resource Block |
ProSe | Proximity based Services |
PSBCH | Physical Sidelink Broadcast CHannel |
PSC | Packet Scheduling |
PSCCH | Physical Sidelink Control CHannel |
PSCell | Primary SCell |
PSDCH | Physical Sidelink Discovery CHannel |
PSK | Pre-Shared Key |
PSM | Power Saving Mode |
PSSCH | Physical Sidelink Shared CHannel |
pTAG | Primary Timing Advance Group |
PTW | Paging Time Window |
PUCCH | Physical Uplink Control CHannel |
PUR | Preconfigured Uplink Resource |
PUSCH | Physical Uplink Shared CHannel |
PWS | Public Warning System |
QAM | Quadrature Amplitude Modulation |
QCI | QoS Class Identifier |
QoE | Quality of Experience |
QoS | Quality of Service |
R-PDCCH | Relay Physical Downlink Control CHannel |
RA-RNTI | Random Access RNTI |
RAC | Radio Admission Control |
RACH | Random Access Channel |
RANAC | RAN-based Notification Area code |
RAT | Radio Access Technology |
RB | Radio Bearer |
RBC | Radio Bearer Control |
RCLWI | RAN Controlled LTE-WLAN Interworking |
RF | Radio Frequency |
RIBS | Radio-interface based synchronization |
RIM | RAN Information Management |
RLC | Radio Link Control |
RMTC | RSSI Measurement Timing Configuration |
RN | Relay Node |
RNA | RAN-based Notification Area |
RNAU | RAN-based Notification Area Update |
RNC | Radio Network Controller |
RNL | Radio Network Layer |
RNTI | Radio Network Temporary Identifier |
ROHC | Robust Header Compression |
ROM | Receive Only Mode |
RRC | Radio Resource Control |
RRM | Radio Resource Management |
RU | Resource Unit |
S-GW | Serving Gateway |
S-RSRP | Sidelink Reference Signal Received Power |
S1-MME | S1 for the control plane |
SAE | System Architecture Evolution |
SAP | Service Access Point |
SBCCH | Sidelink Broadcast Control Channel |
SC-FDMA | Single Carrier – Frequency Division Multiple Access |
SC-MCCH | Single Cell Multicast Control Channel |
SC-MTCH | Single Cell Multicast Transport Channel |
SC-N-RNTI | Single Cell Notification RNTI |
SC-PTM | Single Cell Point To Multiploint |
SC-RNTI | Single Cell RNTI |
SCC | Secondary Component Carrier |
SCell | Secondary Cell |
SCG | Secondary Cell Group |
SCH | Synchronization Channel |
SCTP | Stream Control Transmission Protocol |
SD-RSRP | Sidelink Discovery Reference Signal Received Power |
SDAP | Service Data Adaptation Protocol |
SDF | Service Data Flow |
SDMA | Spatial Division Multiple Access |
SDU | Service Data Unit |
SeGW | Security Gateway |
SeNB | Secondary eNB |
SFN | System Frame Number |
SI | System Information |
SI-RNTI | System Information RNTI |
S1-U | S1 for the user plane |
SIB | System Information Block |
SIPTO | Selected IP Traffic Offload |
SIPTO@LN | Selected IP Traffic Offload at the Local Network |
SL-BCH | Sidelink Broadcast Channel |
SL-DCH | Sidelink Discovery Channel |
SL-RNTI | Sidelink RNTI |
SL-SCH | Sidelink Shared Channel |
SPDCCH | Short PDCCH |
SPID | Subscriber Profile ID for RAT/Frequency Priority |
SPT | Short Processing Time |
SPUCCH | Short PUCCH |
SR | Scheduling Request |
SRB | Signalling Radio Bearer |
sTAG | Secondary Timing Advance Group |
STCH | Sidelink Traffic Channel |
SU | Scheduling Unit |
TA | Tracking Area |
TAG | Timing Advance Group |
TB | Transport Block |
TCP | Transmission Control Protocol |
TDD | Time Division Duplex |
TDM | Time Division Multiplexing |
TEID | Tunnel Endpoint Identifier |
TFT | Traffic Flow Template |
TM | Transparent Mode |
TMGI | Temporary Mobile Group Identity |
TNL | Transport Network Layer |
TTI | Transmission Time Interval |
U-plane | User plane |
UAC | Unified Access Control |
UDC | Uplink Data Compression |
UE | User Equipment |
UL | Uplink |
UM | Unacknowledged Mode |
UMTS | Universal Mobile Telecommunication System |
UpPTS | Uplink Pilot Time Slot |
UTRA | Universal Terrestrial Radio Access |
UTRAN | Universal Terrestrial Radio Access Network |
V2I | Vehicle-to-Infrastructure |
V2N | Vehicle-to-Network |
V2P | Vehicle-to-Pedestrian |
V2V | Vehicle-to-Vehicle |
V2X | Vehicle-to-Everything |
VRB | Virtual Resource Block |
WLAN | Wireless Local Area Network |
WT | WLAN Termination |
WUS | Wake Up Signal |
X2-C | X2-Control plane |
X2 GW | X2 GateWay |
X2-U | X2-User plane |
Xw-C | Xw-Control plane |
Xw-U | Xw-User plane |
4.總體架構
4.1 概述
E-UTRAN由eNBs組成,提供E-UTRA用戶平面(PDCP/RLC/MAC/PHY)和控制平面(RRC)協議終端。eNBs通過X2接口相互連接。eNBs也通過S1接口連接到EPC(進化的包核心),更具體地通過S1-MME接口連接到MME(移動管理實體),並通過S1- u接口連接到服務網關(S-GW)。S1接口支持MMEs /服務網關和eNBs之間的多對多關係。E-UTRAN體系結構如下:
4.2 功能劃分
eNB承載以下功能:
-無線電資源管理功能:無線電承載控制、無線電訪問控制、連接移動性控制、上行、下行和靠邊的資源動態分配(調度);
-IP和以太網報頭壓縮、上行數據解壓和用戶數據流加密;
-選擇一個MME在UE附件時,沒有路由到一個MME,可以從UE提供的信息確定;
-將用戶平面數據路由至服務網關;
-調度和傳輸傳呼信息(來自MME);
-調度和傳輸廣播信息(由MME或O&M發出);
-測量和測量報告配置移動和調度;
-調度和傳輸來自MME的PWS(包括ETWS和CMAS)消息;
-CSG處理;
-上行鏈路上的傳送級別數據包標記;
-無UE移動性的S-GW重新定位,定義爲TS 23.401 [17];
-SIPTO@LN處理;
-爲用戶平面CIoT EPS優化維護安全和無線電配置,如TS 24.301[20]中定義的;
-可選註冊X2 GW(如果使用)。
4.3 無線電協議體系結構
4.3.1 概述
給出了E-UTRAN的用戶平面和控制平面的無線協議體系結構。
4.3.2 用戶面
下圖顯示了用戶平面的協議棧,其中PDCP、RLC和MAC子層(在網絡端以eNB終止)執行用戶平面列出的功能,例如頭壓縮、加密、調度、ARQ和HARQ。對於窄帶物聯網,在通過NAS傳輸數據時不使用用戶平面。
4.3.2 控制面
下圖爲控制平面的協議棧,其中:
-PDCP子層(在網絡端以eNB終止)執行控制平面列出的功能,例如加密和完整性保護;
-RLC和MAC子程序(在網絡端以eNB終止)執行與用戶平面相同的功能;
-RRC(在網絡端以eNB終止)執行以下功能:
–廣播;
–分頁;
–RRC連接管理;
–RB控制;
–移動功能;
–UE測量報告和控制,NB-IoT除外。
-NAS控制協議(在網絡端以MME終止)執行以下功能:
–EPS無記名管理層;
–驗證;
–ECM-IDLE移動處理;
–ECM-IDLE中的分頁發起;
–安全控制。
4.4 NB-IoT
NB-IoT使用優化的物理層提供對網絡服務的訪問,功耗非常低(例如,全載波帶寬爲180 kHz,副載波間距可爲3.75 kHz或15 kHz)。
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