Download Voice over LTE by Miikka Poikselkä PDF
By Miikka Poikselkä
Describes the technological options and criteria so as to allow the migration of voice and SMS providers over to LTE/EPC networks
Main drivers for the creation of long-term Evolution of UTRAN (LTE) is to supply much better finish person event for cellular broadband providers. despite the fact that, carrier prone additionally must have a transparent technique of the way to supply voice and messaging companies for shoppers and organisations. The voice carrier over LTE is changing into more and more vital while the cellphone penetration is expanding speedily. Smartphones require either quality voice and excessive velocity broadband data.
This publication presents the exhaustive view to industry-approved applied sciences and criteria in the back of the Voice over LTE (VoLTE). no matter if a call maker or know-how analyst, this booklet explains an issue of considerable international marketplace interest. It presents a very good creation to the expertise and turns out to be useful for operators who could be deploying VoLTE, product managers chargeable for VoLTE items and those that paintings in implementation and standardization of similar technologies.
Provides a complete evaluation of industry-approved applied sciences and criteria, supplying very important details for determination makers and people engaged on the technology
Written via authors operating on the leading edge of cellular communications expertise at the present time, bringing a mixture of criteria and product history, ensuring in-depth functional and criteria information
Covering the technical and sensible parts of VoLTE, explaining some of the methods for supplying voice providers over LTE
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Additional info for Voice over LTE
In the EMM-REGISTERED and ECM-IDLE state, the UE performs the following: (i) tracking area update, (ii) periodic tracking area update, (iii) service request and (iv) answer the paging from MME with service request. UE and MME enter the ECM-CONNECTED state when signalling connection is established. In the ECM-CONNECTED state the UE location is known in the MME with the accuracy of a serving eNodeB. The S1 release procedure changes the state at both UE and MME from ECM-CONNECTED to ECM-IDLE. 1 Tracking Area Update Once the UE is successfully registered, it needs to keep the network informed about its current location in order to be reachable for downlink signalling and user data even when the UE is in idle mode, that is when the signalling connection to the UE has been released.
As the SIP protocol is a text-based signalling protocol, it contains a large number of headers and header parameters, including extensions and security-related information which means that their message sizes are larger than with binary-encoded protocols. For speeding up the session establishment 3GPP has mandated the support of SIP compression between the UE and P-CSCF in all other 3GPP accesses than in LTE. 1 to compress messages if the UE has indicated that it wants to receive signalling messages compressed.
21 shows how support functions are connected to other IMS entities (SEG is not shown). Interconnection Border Control Function and Transition Gateway: An IBCF provides speciﬁc functions in order to perform interconnection between two communication service provider domains. It enables communication between IPv6 and IPv4 IMS applications, transcoding between different media codecs, network topology hiding, controlling transport plane functions, screening of SIP signalling information, selecting the appropriate signalling interconnect and generation of CDRs.