如今，各大主流運(yùn)營(yíng)商都拿出了百十億美元的資金推廣各自的4G網(wǎng)絡(luò)，但全美各地的推進(jìn)程度卻并不均衡。

網(wǎng)絡(luò)評(píng)級(jí)機(jī)構(gòu)Rootmetrics公司進(jìn)行的調(diào)查顯示，美國(guó)各大城市的4G網(wǎng)絡(luò)的普及有很大差距，因?yàn)檫\(yùn)營(yíng)商的投資與某些地區(qū)的用戶增長(zhǎng)率并不總能保持同步。在該公司最近發(fā)布的排名中，包括芝加哥、亞特蘭大和紐約在內(nèi)的一些大城市的排名都有所下降。

為測(cè)試全美各地的移動(dòng)網(wǎng)絡(luò)建設(shè)情況，Rootmetrics公司派遣了一批專業(yè)測(cè)試人員，驅(qū)車分赴美國(guó)的125個(gè)主要城市，對(duì)當(dāng)?shù)匾苿?dòng)網(wǎng)絡(luò)的總體可靠性、網(wǎng)速以及通話、短信息和數(shù)據(jù)質(zhì)量等指標(biāo)進(jìn)行測(cè)試，然后根據(jù)測(cè)試結(jié)果，對(duì)美國(guó)四大主流運(yùn)營(yíng)商——AT&T、威瑞森、T-Mobile和斯普林特進(jìn)行了排名。其中，威瑞森在最近的這張榜單上排名首位。

2016年下半年，美國(guó)網(wǎng)絡(luò)質(zhì)量居首的五個(gè)城市全部集中在遠(yuǎn)離東西海岸的中部地區(qū)。其中印第安納波利斯以搶眼的總體網(wǎng)速和數(shù)據(jù)網(wǎng)絡(luò)性能排名首位，里士滿以較強(qiáng)的可靠性和通話服務(wù)排名第二，排在第三位的克里夫蘭也有較強(qiáng)的網(wǎng)速和數(shù)據(jù)性能。排名第四的哥倫布市在各項(xiàng)指標(biāo)上都比較均衡。明尼阿波里斯市在這張榜單上名列第五位。

在倒數(shù)前五名中，奧馬哈在所有125座城市中排名倒數(shù)第一。奧馬哈地區(qū)的居民忍受著全美最差的移動(dòng)網(wǎng)絡(luò)服務(wù)，這座城市在每個(gè)指標(biāo)上都排名墊底。尤其是較高的通話阻斷率已經(jīng)成為這座城市移動(dòng)網(wǎng)絡(luò)服務(wù)的最大問題。這已經(jīng)是奧馬哈連續(xù)第三次在調(diào)查中排名墊底或倒數(shù)第二名了。

沃斯特市的移動(dòng)網(wǎng)絡(luò)質(zhì)量排名倒數(shù)第二，它的鄰居斯普林菲爾德則排在倒數(shù)第四名。倒數(shù)第三是加州的圣羅莎，倒數(shù)第五則是紐約地區(qū)的哈德孫谷。

Rootmetrics公司也指出，對(duì)于紐約市北部的居民來說，他們所能享受到的網(wǎng)絡(luò)質(zhì)量還是較之前的幾次調(diào)查稍有提高。“與上一輪測(cè)試相比，哈德孫谷地區(qū)的消費(fèi)者的確在2016年下半年享受到了更好的移動(dòng)網(wǎng)絡(luò)體驗(yàn)，它在五大指標(biāo)類別上的總分都有所提高。”

在美國(guó)人口最多的大城市中，紐約的總體移動(dòng)網(wǎng)絡(luò)質(zhì)量排名全美第66位，洛杉磯排在第49位，邁阿密排在第89位，費(fèi)城排在第32位。排名第8的芝加哥則是特大城市中唯一進(jìn)入前十的一個(gè)。（財(cái)富中文網(wǎng)）

作者：Aaron Pressman

譯者：樸成奎

Mobile carriers have spent billions to expand the reach of their 4G networks, but the gains aren't spreading evenly across the country.

Surveys by network rater Rootmetrics found starkly varying conditions in different metropolitan areas, as carriers' investments didn't always match the growth of usage in some places. In its latest rankings, some of the largest cities in the country—including Chicago, Atlanta, and New York—saw their ratings drop.

Rootmetrics sends professional surveyors driving through 125 cities to test mobile networks on overall reliability and speed, as well as separate measures of call, text, and data quality. The firm rates the big four carriers—AT&T (t, -1.02%), Verizon (vz, -0.90%), T-Mobile (tmus, +1.28%), and Sprint (s, -0.12%)—in a separate report. Verizon came out on top most recently.

For the second half of 2016, the top five cities ranked by overall network quality were all in the center of the country away from the coasts. Indianapolis garnered the top spot, thanks to strong overall speed and data networking performance. Number two-ranked Richmond earned its place with strong reliability and calling ratings. Cleveland was third, also with strong speed and data performance, while Columbus was fourth with steady scores across all categories. Minneapolis rounded out the top five.

Among the five bottom dwellers, Omaha was ranked last out of all 125 metro areas, Rootmetrics said. Omaha residents received the worst mobile performance in the country, with the city ranking dead last in every category tested. A particularly high rate of blocked calls was the city's biggest issue. It was the third straight survey where Omaha ranked last or second to last.

Just slightly better, Worcester's mobile networks ranked second last in the survey, with nearby Springfield, Mass., ranking fourth worst. In between, Santa Rosa, Calif., ranked third worst. And the final member of the bottom dwelling five was the Hudson Valley, N.Y. region.

Still, for residents of the area north of New York City, performance improved slightly from previous surveys, Rootmetrics noted. "Compared to the previous round of testing, consumers in Hudson Valley did enjoy a better mobile experience in the second half of 2016, with higher composite scores in all five performance categories," the testing firm wrote.

Among the five largest cities by population, New York ranked 66th in overall mobile performance, Los Angeles was 49th, Miami was 89th, and Philadelphia was 32nd. Only residents of Chicago, which ranked 8th overall, made the top 10 of the rankings.