????覆蓋范圍不是唯一拖累5G發(fā)展的問題,，另一個問題是什么？頻譜資源有限,，這在美國已經是一個相當嚴重的問題,。“如果由于網絡負載飽和而變慢,，從而拖累5G,，會怎樣呢？”席爾瓦問道,，“美國是否能提供更多光譜以滿足數(shù)據(jù)使用需求還是個問題,。另外一個問題是運營商的流量限制，如果能在幾分鐘內接收一部電影,，消費者將很快用完流量額度,。”

????要使5G成為現(xiàn)實,，這只是其中幾個需要解決的問題,。更大的難題在于目前還沒有既定標準，即使著手制定,，也不是一朝一夕的事,?！盁o論是有線或無線，技術人員都在不斷努力提升寬帶速度,，”席爾瓦說道,，“但這不是動動手指就能解決的。我們也不知道其他公司的藍圖上有怎樣的規(guī)劃,。在商定標準之前,，仍有許多方面需要充實完善,，許多尚未到位的內容要及時敲定,。”

????另一方面,，這也使得2020年這一截止期顯得不那么現(xiàn)實,。不過，全球移動通信系統(tǒng)（GSM）于1990年推出后,，2003年便出現(xiàn)了3G,，2009年4G也隨之到來。從某些方面說,，這一技術的開發(fā)已經出現(xiàn)了一定的競爭態(tài)勢,，中國已成立由政府牽頭的“IMT-2020 (5G) 推進組”，專門致力于5G研發(fā),，而歐盟委員會也宣布計劃于2013年投資5000萬歐元,，以期在2020年將5G推向市場。根據(jù)這個時間表,，以及全球廠商對這一技術的關注,，5G很可能在10年內實現(xiàn)，但問題猶存,。

????“許多國家的問題是,，連推出4G都面臨一些宏觀層面的難題，”格林森補充道,，“幾年內可能還無法將5G投入商用,，不過目前一切還只是推測。因為我們無法預知今后10年的經濟形勢和技術發(fā)展,。還有太多問題仍待解決,。”（財富中文網）

????譯者：默默

????Range won't be the only issue that could be a stalling point for 5G. The other? Spectrum limitations, already a significant problem in the United States. "What happens if 5G is compromised because of slowdowns due to network capacity?" asks Silva. "There is still the question as whether the United States can make available more spectrum to accommodate the data usage. There is also the issue of how carriers today have data caps, and if streaming a movie in a few minutes is an option, consumers could reach those data caps rather quickly."

????Those are just a few problems that will need to be addressed as 5G becomes a reality. The bigger issue is that there is still no set standard and won't likely be one for some time. "There are constant efforts to make broadband faster whether it is through the wirelines or wireless," says Silva. "But you can't just snap your fingers and make it happen. We also don't know what is on the drawing boards of other companies. Until the standards are agreed upon. there is still a lot to flesh out, with a lot of moving parts that will play out in time."

????On the one hand this makes a possible deadline of 2020 seem unlikely, but GSM came out in the 1990s, following by 3G in 2003, with 4G arriving in 2009. In some ways there is already a race in progress to develop the technology, as China has established a government-led "IMT-2020 (5G) Promotion Group" specifically for 5G research, while the European Commission has also announced plans to invest 50 million euros in 2013 to bring 5G to market by 2020. Given this timetable, as well as the international interest in the technology, it is quite likely that 5G could arrive in the next decade, but issues do remain.

????"The problem for many countries is that on the macro level there are still difficulties in rolling out 4G," adds Gleeson. "A commercial launch of 5G thus might not come for years; it is just speculation at the moment. For one we don't know how the economy will fare or how the technology will actually develop over the next 10 years. There are just too many unanswered questions."