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Advanced Wireless > LTE Architecture > Flashcards

LTE Architecture Flashcards

1
Q

EPS?

A

Evolved Packet System

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2
Q

EPS Components?

A

User Equipment
Evolved UTRAN
Evolved Packet Core

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3
Q

UE Components?

A

Mobile Terminal
Terminal Equipment
Universal Integrated Circuit Card

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4
Q

USIM?

A

Stores user-specific data such as

  • User’s phone number
  • Home network identity

Carries out various security-related calculations, using secure keys that the smart card stores

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5
Q

IP Support?

A

LTE UE Supports

  • IPv4
  • IPv6
  • Duel Stack

A mobile receives one IP address for every Packet Data Network it is communicating from:

  • Internet
  • Private corporate network
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6
Q

What is E-UTRAN is made of?

A

Enhanced NodeB

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7
Q

Features of eNodeB?

A

Serving eNB
Hard Handover
Combines the functions of NodeB and RNC of UMTS
X2 Interface

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8
Q

Transport Network?

A

S1 and X2 Interfaces are not physical, rather logical interfaces.

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9
Q

Femto Cell

A 
Smallest cell in LTE
eNB is called Home eNB
Closed Subscriber Group
Home eNB Gateway
S1 Interface in Femto cell
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10
Q

Architecture of the EPC?

A

Main components of the EPC

  • HSS
  • P-GW
  • S-GW
  • MME
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11
Q

HSS

A

Home Subscriber Server

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12
Q

P-GW

A

PDN Gateway

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13
Q

S-GW

A

Serving Gateway

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14
Q

MME

A

Mobility Management Entity

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15
Q

Home Subscriber Server?

A

Continued from UMTS
Central database
Contains information about all the subscribers

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16
Q

PDN Gateway?

A 
EPC's gateway to the Packet Data Networks (PDN)
Connects to one or more
- Outside data networks
- LTE Operator's servers
- IP Multimedia Subsystem
APN
SGi
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17
Q

Serving Gateway?

A

Acts as a high-level router

Forwards data between the base station and the PDN gateway.

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18
Q

Mobility Management Entity?

A

Controls the high-level operation of the mobile
Sends signalling messages to mobiles about:
- Security
- Management of data streams
- Communicates with other elements of the network
- Using signalling messages that are internal to the EPC

19
Q

One MME is responsible for?

A

For the mobiles in a certain geographical region

20
Q

Each mobile is?

A

Assigned to a single MME

  • Called its serving MME
  • Serving MME will change if the mobile moves sufficiently far
21
Q

Roaming Architecture?

A

Roaming allows a mobile to communicate with the Internet and the IP multimedia subsystem while visiting other network

22
Q

Data traffic to PDN may go in two ways?

A

Home Routed Traffic

Local Breakout

23
Q

Home Routed Traffic?

A

In which the PDN gateway lies in the home network

24
Q

Local Breakout?

A

In which the PDN gateway lies in the visited network

25
Q

EPC is divided into 3 types of geographic areas:

A

MME Pool Area
S-GW Service Area
Tracking Area

26
Q

MME Pool Area?

A

Overlapping; mobile does not change MME in an area

27
Q

S-GW Service Area?

A

Overlapping, mobile does not change S-GW with in the area

28
Q

Tracking Area?

A

Non-overlapping; used to track the locations of mobiles that are on standby
Similar to location area in GSM/UMTS

29
Q

GUMMEI?

A

Composition of Globally Unique MME Identifier

30
Q

PLMN-ID?

A

Public Land Mobile Network Identifier

  • MCC
  • MNC
31
Q

MMEI?

A

MME Identifier

  • MMEGI
  • MMEC
32
Q

Tracking Area Identifiers?

A

TAC

TAI

33
Q

TAC?

A

Tracking Area Code

- Identifies a tracking area within a network

34
Q

TAI?

A

Tracking Area Identity

- Globally unique ID of a tracking area

35
Q

Cell Identifiers?

A

E-UTRAN Cell Identity (ECI)
E-UTRAN Cell Global Identifier (ECGI)
Physical Cell Identity

36
Q

Identities used by the mobile?

A

IMEI
IMSI
Temporary IDs mobile used in the air interface

37
Q

High-Level Protocol Architecture of LTE?

A

User plane protocols
Control plane protocols
Transport protocols

38
Q

User plane protocols?

A

Carries user traffic

TCp/IP-based

39
Q

Control Plane Protocols?

A

Carries signalling

LTE/SAE Specific

40
Q

Transport Protocols?

A

Provides transport for both user plane and control plane

TCP/IP and underlying transport protocol

41
Q

Communication between mobile and MME?

A

No direct path between MME and a mobile

Non Access Stratum is carrier by Access Stratum

42
Q

Air Interface Transport Protocols?

A 
Physical Layer
MAC (Media Access Control)
RLC (Radio Link Control)
PDCP (Packet Data Convergence Protocol)
RRC (Radio Resource Control)
IP (Internet Protocol)
43
Q

Access Stratum?

A 
Any layer 1 and layer 2 protocol
Layer 3 is invariably IP
Layer 4:
- UDP for user traffic
- TCP and SCTP for signalling
44
Q

MME controls a mobile’s high-level behavior using two protocols

A

EPS Session Management

EPS Mobility Management

Advanced Wireless (11 decks)

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