By Martin Sauter
I purchased this e-book someday in the past simply because i assumed that the author's earlier booklet was once good written, despite the fact that I by no means discovered time to learn it completely.
Over prior few months, i found that I saved going again to the publication and the author's web publication to appear for reference (e.g. to get a greater knowing on SIM card, or to calculate spectrum potency and telephone ability, etc.). So i made a decision to deliver this booklet with me on a visit and eventually learn the full publication (well... almost). i must say this is often one other rather well written booklet from the writer. The writing is especially transparent and the figures appear at the place they're wanted, not anything fancy, dry, or redundant. simply enough textual content and figures to hide the subject and that i by no means needed to re-read a piece to appreciate the topic (like I often do whilst interpreting a 3GPP standard).
What I loved the main approximately this booklet is that the chosen components that the writer selected to dive into mirrored not just his thorough knowing of the normal, but in addition his seen hands-on adventure. This booklet was once not just good understandable, but in addition functional, an exceptional connection with have at your table for a instant engineer. i glance ahead to learn destiny courses from the writer, both at his web publication or a brand new publication.
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Additional info for Beyond 3G - Bringing Networks, Terminals and the Web Together: LTE, WiMAX, IMS, 4G Devices and the Mobile Web 2.0
Furthermore, IP packets in the uplink direction are also transported in a dedicated channel. Finally, a parallel circuit-switched voice call is also transported in a Beyond 3G Network Architectures 35 dedicated channel. These dedicated connections can be in soft handover state to improve reception conditions and to better cope with the user’s mobility. The shared channels, however, are only sent from one base station of a device’s active set. Based on the feedback received from the mobile device, the RNC can at any time promote another base station to forward the IP packets in the downlink.
2 shows a GSM radio network, which is also connected to the circuit-switched and packet-switched core network. Depending on the network vendor, the GSM radio network can either be connected to the same MSCs and SGSNs or to separate ones. This is possible since the functionality of these components is very similar for GSM and UMTS. The interfaces to the 2G and 3G radio networks, however, are different. For the connections to the 3G radio network, ATM is used as the lower layer transport protocol while the connection between the SGSN and the 2G radio network is based on the Frame Relay protocol.
The second reason to re-use the dedicated channel concept was that the soft handover concept is especially valuable for the uplink direction as the transmission power of mobile devices is limited. In the standards, an HSUPA dedicated uplink channel is referred to as an Enhanced-DCH or E-DCH. A standard uplink dedicated channel is controlled by the RNC and spreading codes can only be changed to reach maximum data transfer rates of 64, 128 or 384 kbit/s. As the RNC is in control of the connection, the bearer parameters are only changed very slowly, for example only every few seconds once the RNC detects that the pipe is too big or too small for the current traffic load or once it detects that signal conditions have significantly changed.