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Questions and Answers
What is the primary function of the MME in LTE-EPC?
What is the primary function of the MME in LTE-EPC?
- Controlling the eNodeB and managing the air interface
- Managing radio resources and scheduling
- Managing and storing UE contexts, generating temporary UE Identifiers, and controlling security functions (correct)
- Routing data packets between the UE and the internet
What protocol is used for tunneling between eNodeB and MME?
What protocol is used for tunneling between eNodeB and MME?
- SCTP (correct)
- HTTP
- TCP/IP
- UDP
What is the purpose of the Physical Control Format Indicator Channel?
What is the purpose of the Physical Control Format Indicator Channel?
- To transmit control information for uplink data
- To transmit user data
- To transmit acknowledgements and scheduling requests
- To indicate carrier information and channel quality (correct)
What is the life cycle stage where the UE attaches to the network?
What is the life cycle stage where the UE attaches to the network?
What is the purpose of the Physical Hybrid ARQ Indicator Channel?
What is the purpose of the Physical Hybrid ARQ Indicator Channel?
What is the primary function of the eNodeB in LTE-EPC?
What is the primary function of the eNodeB in LTE-EPC?
What is the term for the process of transferring a UE's connection from one cell to another?
What is the term for the process of transferring a UE's connection from one cell to another?
What is the stage of the UE life cycle where the UE requests a service?
What is the stage of the UE life cycle where the UE requests a service?
What is the primary function of the Mobility Management Entity (MME) in the EPC architecture?
What is the primary function of the Mobility Management Entity (MME) in the EPC architecture?
What is the primary function of the Home Subscription Server (HSS) in the EPC architecture?
What is the primary function of the Home Subscription Server (HSS) in the EPC architecture?
What is the primary function of the eNodeB in the E-UTRAN architecture?
What is the primary function of the eNodeB in the E-UTRAN architecture?
What is the primary function of the Serving Gateway (S-GW) in the EPC architecture?
What is the primary function of the Serving Gateway (S-GW) in the EPC architecture?
What is the primary function of the Packet Data Network Gateway (P-GW) in the EPC architecture?
What is the primary function of the Packet Data Network Gateway (P-GW) in the EPC architecture?
What is the primary function of the Evolved Packet Core (EPC) in LTE architecture?
What is the primary function of the Evolved Packet Core (EPC) in LTE architecture?
What is the primary function of the Radio Access Network (RAN) in LTE architecture?
What is the primary function of the Radio Access Network (RAN) in LTE architecture?
What is the primary function of the eNodeB in terms of security in the E-UTRAN architecture?
What is the primary function of the eNodeB in terms of security in the E-UTRAN architecture?
What is the primary purpose of Carrier Aggregation in LTE-Advanced?
What is the primary purpose of Carrier Aggregation in LTE-Advanced?
What is the maximum combined bandwidth that can be achieved using Carrier Aggregation?
What is the maximum combined bandwidth that can be achieved using Carrier Aggregation?
What is the main advantage of Coordinated Multi-point operation in LTE-Advanced?
What is the main advantage of Coordinated Multi-point operation in LTE-Advanced?
What is the minimum bandwidth of a Component Carrier in Carrier Aggregation?
What is the minimum bandwidth of a Component Carrier in Carrier Aggregation?
What is the target peak data rate for low mobility scenarios in IMT-Advanced systems?
What is the target peak data rate for low mobility scenarios in IMT-Advanced systems?
What is the primary goal of LTE-Advanced (LTE Rel 10/11)?
What is the primary goal of LTE-Advanced (LTE Rel 10/11)?
What is the main benefit of Intra-band contiguous carrier aggregation?
What is the main benefit of Intra-band contiguous carrier aggregation?
Which of the following is NOT a deployment scenario for Carrier Aggregation?
Which of the following is NOT a deployment scenario for Carrier Aggregation?
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Study Notes
Physical Channels in LTE
- Transmits user data
- Physical Uplink Control Channel (PUCCH)
- Physical Control Format Indicator Channel (PCFICH) indicates carrier information, channel number, OFDM symbols used for control information, quality, and acknowledgements
- Physical Hybrid Indicator Channel (PHICH) transmits ACK/NACK for scheduling requests and uplink data
Protocol Stack in LTE
- MME (Mobility Management Entity) is present in the protocol stack
LTE-EPC Overview
- Life cycle of a UE involves: • Network Acquisition • Signaling connection • Attach • Authentication • IP Connectivity • Service Request • Radio Access bearer • Scheduling requests and grants • Handover • Release
Mobility Management Entity (MME)
- MME is responsible for: • Managing and storing UE contexts • Generating temporary UE identifiers • Managing idle state mobility • Distributing paging messages • Controlling security functions like authentication • Controlling EPS bearers • Selecting S-GW and P-GW
- MME uses SCTP (Stream Control Transmission Protocol) tunneling protocol between eNodeB and MME
Network Architecture in LTE
- LTE architecture consists of: • Radio Access Network: Evolved UTRA Network (E-UTRAN) • Core Network Architecture: Evolved Packet Core (EPC)
Network Architecture in E-UTRAN
- Evolved NodeB (eNodeB) is responsible for: • Radio Resource management • Synchronization and interference control • MME selection among MME pool • Routing of user plane data from/to S-GW • Encryption/Integrity protection of user data • IP Header Compression
Network Architecture in EPC
- MME is responsible for: • NAS (Non-Access Stratum) signaling and its security • Tracking Areas List management • PDN GW and SGW selection • Roaming and authentication • EPS bearer management • Signaling for mobility management between 3GPP RANs
Network Architecture in EPC (Contd.)
- Home Subscription Server (HSS) is responsible for: • User authentication • Subscription/Profile management (roaming, speed/throughput limits)
LTE Advanced
- LTE-Advanced (LTE Rel 10/11) introduced new features: • Carrier Aggregation • Enhanced Multi-Antenna techniques (SU-MIMO and MU-MIMO) • Coordinated Multi-point operation (COMP) • Enhancements to UE Categories
Carrier Aggregation
- Carrier Aggregation enables: • Wider transmission bandwidths up to 100 MHz • Operators to use different chunks of spectrum in combination to deliver greater throughputs to UEs • Operators to use fragmented pieces of spectrum
- Deployment scenarios: • Intra-band contiguous carrier aggregation • Intra-band non-contiguous carrier aggregation • Inter-band non-contiguous carrier aggregation
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