The second concern deals with channel switching. Here a user may want to view other channels and
therefore the DVB-H may need to demodulate another time slice of data. In this case the terminal may
need to wait for an MPE-FEC frame (of possibly different size than the existing one) and possibly compensate
for other delays in the media. Needless to say this disruption to the user should be minimized.
Another concern deals with tune-in time for new linking terminals. Similar issues related to channel
switching also apply here with any additional synchronization concerns due to the need to determine
time-slice synchronization, and so on. In either case, it is always prudent to have a robust MPEG
error concealment/handling algorithm to assist in these times.
Generally speaking, there are many issues affecting the overall system performance; below we list
some of them: BW management, possible encryption, scheduling of services, DVB-H receiver capability
variations within a coverage area, future IP-based applications, content development for small
size display screens, base station capability, content server requirements, other FEC improvements,
indoor/outdoor reception performance, coexistence with cellular systems, SFN and multiple frequency
network (MFN) deployment, higher transmit power, and so on.
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