lte protocol stack
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Fast • Portable • Customisable LTE Protocol Stack
LTEProtocolStack
LTEProtocolStackThe 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.
TechnicaldescriptionThe protocol elements and their location in the hierarchy are shown in the protocol stack Figure 1.
Applicationlayer
AV Streaming
Web Browsing
S1andX2
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:
PDCP 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.
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NAS SignalingProtocols
(including security)
S1-ApplicationProtocol (S1-AP)
S1-ApplicationProtocol (S1-AP)
NAS SignallingProtocols
(including security)
RRC RRC
PDCP
RLC
MAC
PHY
LT -Uu S1-MME
MME
PDCP
SCTP SCTP
IPSec IPSec
IP inc. Diffserv IP inc. Diffserv
Data Link Layer 2 Data Link Layer 2
PHY Layer 1 PHY Layer 1
RLC
MAC
PHY
eNB
Control Plane Protocols
UE
UE eNB S-GW PDN-GWEndUser
Appl.
TransportProtocols
PDCP
MAC
RLC
PHY
PDCP
MAC
RLC
PHY
LTE-Uu S1-U S 5/S 8
PHY PHY PHY PHY
PHY PHY
GTP-U GTP-UGTP-U GTP-U
PIMP PIMP
IP incDiffserv
IP incDiffserv
IP incDiffserv
IP incDiffserv
UDP UDPUDP UDP
IP Sec IP Sec IP Sec IP Sec
Data Link Data Link Data Link Data Link
TransportProtocols(inc IP)
Appl.
Data Link
User Plane Protocols
Figure 1. LTE Protocol Stack
FurtherDevelopmentRoadmapOur 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.
Some of the most important stage features are shown in Figure 2. A complete list is available separately – contact us for details.
HARQ
Time
Enhanced stackCore stack
UE Capabilities
Full standardscompliancePDCP/RLC/MAC
Data Transfer
Intra-LTEHandover
SecurityEstablishment
HeaderCompression
DynamicScheduling
Inter-LTEHandover
Complete stack
BackgroundOver 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 user through increased efficiency and improved data rates.
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Figure 2. Roke LTE Stack Road Map
For further information please contact:
Elaine Burroughs T +44(0)1794672898F +44(0)[email protected] Marketing departmentT +44(0)1794833455F +44(0)[email protected]
Roke Manor Research Limited RokeManor,Romsey,HampshireSO510ZNUKT +44(0)1794833000F +44(0)[email protected]
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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 dedi-cated Roke team to be an extension of their own development group.
50 years of Innovation@Roke
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