5G Physical Channel Components

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Questions and Answers

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?

SCTP (correct)

HTTP

TCP/IP

UDP

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?

Attach Signup and view all the answers

What is the purpose of the Physical Hybrid ARQ Indicator Channel?

To transmit acknowledgements and scheduling requests Signup and view all the answers

What is the primary function of the eNodeB in LTE-EPC?

Controlling radio resources and scheduling Signup and view all the answers

What is the term for the process of transferring a UE's connection from one cell to another?

Handover Signup and view all the answers

What is the stage of the UE life cycle where the UE requests a service?

Service Request Signup and view all the answers

What is the primary function of the Mobility Management Entity (MME) in the EPC architecture?

Handling NAS signaling and its security Signup and view all the answers

What is the primary function of the Home Subscription Server (HSS) in the EPC architecture?

Performing user authentication and subscription/profile management Signup and view all the answers

What is the primary function of the eNodeB in the E-UTRAN architecture?

Performing synchronization and interference control Signup and view all the answers

What is the primary function of the Serving Gateway (S-GW) in the EPC architecture?

Handling routing of user plane data from/to S-GW Signup and view all the answers

What is the primary function of the Packet Data Network Gateway (P-GW) in the EPC architecture?

Performing routing of user plane data from/to S-GW Signup and view all the answers

What is the primary function of the Evolved Packet Core (EPC) in LTE architecture?

Performing routing and forwarding of user plane data Signup and view all the answers

What is the primary function of the Radio Access Network (RAN) in LTE architecture?

Performing radio resource management and synchronization Signup and view all the answers

What is the primary function of the eNodeB in terms of security in the E-UTRAN architecture?

Performing encryption and integrity protection of user data Signup and view all the answers

What is the primary purpose of Carrier Aggregation in LTE-Advanced?

To enable the use of fragmented pieces of spectrum Signup and view all the answers

What is the maximum combined bandwidth that can be achieved using Carrier Aggregation?

100 MHz Signup and view all the answers

What is the main advantage of Coordinated Multi-point operation in LTE-Advanced?

Increased cell edge throughput Signup and view all the answers

What is the minimum bandwidth of a Component Carrier in Carrier Aggregation?

1.4 MHz Signup and view all the answers

What is the target peak data rate for low mobility scenarios in IMT-Advanced systems?

1 Gbps Signup and view all the answers

What is the primary goal of LTE-Advanced (LTE Rel 10/11)?

To extend the capabilities of LTE Rel-8/9 Signup and view all the answers

What is the main benefit of Intra-band contiguous carrier aggregation?

Simplified network planning Signup and view all the answers

Which of the following is NOT a deployment scenario for Carrier Aggregation?

Inter-band contiguous carrier aggregation Signup and view all the answers

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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Description

This quiz covers the different physical channels in 5G, including the Physical Uplink Control Channel, Physical Control Format Indicator Channel, and Physical Hybrid Indicator Channel.