By Andy Wilton
Instant operators will locate this sensible, hands-on consultant to community deployment necessary. in line with their very own vast adventure, the authors describe an end-to-end community making plans strategy to carry the assured caliber of provider (QoS) that allows modern day instant IP prone akin to VoIP, WWW and streaming video. With a spotlight on useful layout, entire examples are supplied for • GSM/GPRS/EDGE • UMTS/HSDPA • OFDM • Mesh Wifi • Packet backhaul subject matters addressed comprise: • capacity/peak information charges, • carrier latency • hyperlink budgets • lifecycle expenses • community optimisation The trade-off among superior consumer event and operator expense is explored within the context of an more desirable enterprise version. compatible for radio and center community planners, designers, optimizers, and enterprise improvement employees at operators and community gear brands, the book's large references additionally make it an invaluable source for graduate and postgraduate scholars.
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Multiplexing of packets over the air interface is thus achieved by allocating this physical channel in turn to those mobiles with queued traffic. 1 Overview The functionality and key features of GPRS are summarised below : r As many as possible of the GSM elements and identities are reused. These include the AuC, EIR, IMSI and IMEI. r New GPRS radio channels are defined. The allocation of these channels is flexible; from one to eight of the GSM radio interface time slots can be allocated to GPRS per TDMA frame.
Xml 2 QC: SFK/UKS CUUK203-Wilton T1: SFK July 10, 2008 20:24 Wireless network systems The discussion in Chapter 1 indicated that dividing the planned coverage area into a number of radio cells results in a more spectrally efficient solution with smaller and lighter end-user devices. In such a network, as the individual moves further away from the cell to which he or she is currently connected, the signal strength at the mobile eventually falls to a level where correct operation cannot be guaranteed and the call may ‘drop’.
6 MS-SGSN protocols From the earlier discussion of GPRS, recall that it is designed to support one or more concurrent applications over one or more different protocols. The multiplexing of these PDP contexts onto a single radio connection to the mobile (MM context) occurs at the SGSN (for the downlink). Also, PDUs for network-layer protocols, such as IP, likely to be employed by most applications, can have payloads of up to 1500 bytes. It is thus possible that the SGSN may receive up to 12 000 bits or even 24 000 bits from the network in a short space of time.
Deploying Wireless Networks by Andy Wilton