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LTE Protocol Stack

Accelerate your mobile technology

LTE Protocol Stack Fast • Portable • Customisable

LTE Protocol Stack The UMTS-LTE (Long Term Evolution) Protocol Stack has been created using knowledge gained from our long experience in the definition and development of mobile network standards. It is an implementation of the core stack that is ready for integration into your next LTE development and is the latest in a long line of mobile technology created at Roke Manor. Our protocol stack runs in a live environment to demonstrate a truly mobile all-IP network. The demonstration of the prototype includes internet browsing, a live VoIP call and seamless handover.

Technical description The protocol elements and their location in the hierarchy are shown in the protocol stack Figure 1. Application layer • AV Streaming • Web Browsing

UE

S1 and X2 • Simplified GTP-U for U-plane data • SCTP for assured C-Plane messages • S1AP, X2AP: A functional emulation of the S1 and X2 Application Protocols which mimics anticipated message flows and message fields using simpler software structures but avoiding the complexities of a full ASN.1 implementation. eUU: • PD including Header Compression and Encryption • RLC, based on earlier UMTS implementation • MAC with fair downlink scheduling working with LTE resource structures. • A pseudo Layer 1/Layer 2 is used to emulate the air interface whilst utilising the LTE resource structures thus avoiding the need to emulate Layer 1 in testbed developments. Interfacing to a real Layer1 can be achieved without re-design of the lower layers.

eNB

MME NAS Signalling Protocols (including security)

NAS Signaling Protocols (including security) RRC

RRC

PD

PD

RLC

RLC MAC

MAC

PHY

PHY

S1-Application Protocol (S1-AP)

S1-Application Protocol (S1-AP)

SCTP

SCTP

IPSec

IPSec

IP inc. Diffserv

IP inc. Diffserv

Data Link Layer 2

Data Link Layer 2 PHY Layer 1

PHY Layer 1 LT -Uu

S1-MME

Control Plane Protocols UE

eNB

S-GW

PDN-GW

End

Appl.

Appl.

Transport Protocols

Transport Protocols (inc IP) PD

PD

GTP-U

GTP-U

RLC

RLC

UDP

MAC

MAC

IP inc Diffserv

PHY

PHY

UDP

IP Sec

IP Sec IP inc Diffserv

PIMP GTP-U

UDP IP Sec

UDP IP Sec

IP inc Diffserv

IP inc Diffserv

Data Link Data Link

Data Link PHY

LTE-Uu

PIMP GTP-U

PHY S1-U

Data Link PHY

PHY S 5/S 8

Plane Protocols

Figure 1. LTE Protocol Stack

Data Link

PHY

PHY

Further Development Roap Our LTE protocol stack implementation timeline has been designed to provide essential functionality as early as possible and hence to allow for early application development. The core elements of the stack at Layer 2 and above were the primary focus of development in order to allow UE handover between eNodeBs. Subsequent development has transitioned the protocol stack to a more fully compliant solution as the LTE standard has been refined by 3GPP. Work is continuing to extend the compliance of the Roke LTE protocol stack to include functionality for interworking with other RATs (such as UTRAN, CDMA2000 and GPRS) and the optional elements as defined by test priorities currently under discussion by RAN WG5 of 3GPP.

HARQ

Header Compression

Dynamic Scheduling

Intra-LTE Handover

Security Establishment

Inter-LTE Handover

PD/RLC/MAC Data Transfer

UE Capabilities

Core stack

Enhanced stack

Full standards compliance

Complete stack

Time

Figure 2. Roke LTE Stack Road Map

Some of the most important stage features are shown in Figure 2. A complete list is available separately – us for details.

Background Over many years Roke has gained extensive experience in emerging telecommunication technologies, from original research and standards development to rapid development of demonstration prototypes right through to the development and testing of production prototypes. We were one of the first companies in the world to build a GSM demonstrator and have played a similar leading role in the development of 3G systems. Specific examples include: • a 3rd Generation test bed enabling the very first remote TDD phone call in the 1990’s • an environment to test 3rd generation RNC U-Plane performance at full load • Acceptance testing on the RNC • FDD Node B development • Femto Node B evealuation As a result we have extensive knowledge of mobile system standards and many years experience in the development of systems based on those standards. LTE forms the upgrade path from the existing UMTS/3G system and provides many advantages to network operators and the end through increased efficiency and improved data rates.

Our protocol stack runs in a live environment to demonstrate a truly mobile all-IP network. The demonstration of the prototype includes internet browsing, a live VoIP call and seamless handover. We work very closely with our clients and at all times respect absolutely their confidentiality, so much so that they often consider their dedicated Roke team to be an extension of their own development group.

50 years of Innovation@Roke

To discuss how this capability can be integrated into your platform us by using the details below

For further information please : Elaine Burroughs T +44 (0)1794 672898 F +44 (0)1794 833433 [email protected] www.roke.co.uk

Roke Manor Research Limited Roke Manor, Romsey, Hampshire SO51 0ZN UK T +44 (0)1794 833000 F +44 (0)1794 833433 [email protected] www.roke.co.uk © Roke Manor Research Limited 2008. All rights reserved. This publication is issued to provide outline information only, which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as representation relating to the products or services concerned. The company reserves any right to alter without notice the specification, design, or conditions of supply of any product or service. This is a published work the copyright in which vests in Roke Manor Research Ltd. Export of this product may be subject to UK export license approval. 0083