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Spring is in the air, the upfront march to May has begun, and here are some notable items on MCN editors' datebooks for the week ahead. * Watch for wireless-industry news this week from Barcelona, Spain, where the Mobile World Cdngressgets underway. 5G, the emerging next-generation standard, willtake center stage as bothcarriers andvendors are expectedto present more details aboutear(y,pre commer cia 11 r ia Is of t he t ech no logy, wh ich wi tl in it ia lly en ab le mu It iGigabit access speeds for fixed wireless applications and will later support mobility.