For Singapore's case, it's different. Singapore only has 1 main TV transmitter (which is at Bukit Batok if I'm not mistaken), and only has 7 channels. According to the news,
http://www.straitstimes.com/tech/more-time...h-to-digital-tvThe frequencies for all their analogue TV channels are below 700MHz, and their DVB-T2 digital TV frequencies are 5xxMHz, since Singapore's Mediacorp do not plan to launch some new analogue nor digital TV channels (unlike Malaysia, where new digital TV channels are "expected"), so basically from what I see, they don't have the urgency to switch off analogue TV also. This would allow more time for those (especially the elderly) who don't care or don't know about analogue switch-off, to switch over to digital TV. Even after they shut down, those frequencies will be left vacant, but of course it can be re-use in the future. But that doesn't means Singapore don't need to switch off. They know they still have to switch off some day, but it's just that, there's no absolute rush for them.
Meanwhile for Malaysia, we got 10 over main analogue TV transmitters over Peninsular Malaysia and each of them uses different frequencies, and some of it uses over 700MHz range, so this prevented the implementation of 4G services in 700MHz band.
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Malaysia's analogue TV's frequencies are from 470-798MHz
700MHz 4G service (also known as "APT 700", or LTE Band 28) are range from 703-798MHz.
See the signal overlap there starting from 703MHz? So, in order to allow telcos to be able to deliver the 4G services to users, they got to switch off analogue TV, the sooner the better.
The telcos also want to deliver 700MHz 4G service to customers as soon as they can, because the 3G/4G networks across telcos especially in Klang Valley areas is starting to get congested as smartphone users is increasing rapidly. With more mobile frequencies spectrum band available like 700MHz, this can cater more users to enjoy fast mobile Internet. So I don't think even the MCMC will delay the date of analogue switch-off as from what I see, MCMC is quite taking pretty seriously this time. But
if it get delay, I guess the latest is end-2018, won't go until 2019.
A additional point is even if they do switch off analogue TV according to the plan (All services in Singapore currently transmitted, including analogue services are all below 600MHz), they still can't activate 700MHz LTE Band 28 because of the potential interference from Malaysia's TV1 analog and many Indonesian analog TV services which is currently still transmitted on that band. They can only activate if these channels/services from both countries are all switched off. Some spectrum repacking will be also done in Malaysia after analogue switchover if MYTV decided to start MUX 2/3 later to accommodate more digital services on myFreeview. (which most of them is allocated on 700MHz band).