Co hay khong viec song 3G da song 2G

Thứ năm, 15 Tháng mười 2009, 21:05 GMT+7

Theo phan anh cua nhieu khach hang su dung mang VinaPhone, Mobi Fone..., tren man hinh dien thoai xuat hinh chu 3G, dong thoi xay ra hien tuong mat song va khong the lien lac. Tuy nhien, theo cac chuyen gia, song 3G va 2G ton tai song song khong anh huong den nhau.



Mat song, nghen song vi 3G...


Mo ta anh.
(Nguon: trak.in)
Thu truong Bo Thong tin va Truyen thong Le Nam Thang da tung khang dinh, su phat trien 3G khong phai la su phu nhan cai cu, ma la su tiep noi tren nen tang cua 2G, nhieu thanh to cua 2G duoc su dung lai nhu he thong cuoc goi, nhan tin, MMS, Data...Tuy nhien, theo y kien tu nhieu khach hang, mang 3G dang “tieu diet” 2G.

Anh Do Van Thao (nhan vien kinh doanh cong ty TNHH Van Hoa) – khach hang cua mang di dong VinaPhone cho biet: “Toi co viec di qua khu vuc Trung Hoa – Nhan Chinh, khi lay may dien thoai ra goi cho mot khach hang thi khong thay lien lac duoc, nhin len cot song thay khong he co vach song nao, ma thay bieu tuong 3G tren may”.

Nhieu khach hang khac cua MobiFone, Viettel cung cho biet, di mot so khu vuc nhu Nga Tu So, Kim Ma, Giai Phong, Trung Hoa - Nhan Chinh, dien thoai khi xuat hien chu 3G thi khong the lien lac duoc voi thue bao khac, may chi bao co loi ket noi. “Ngay giua thu do ma khong the bat duoc song dien thoai, that khong the hieu noi”. Chi Hoang Khanh Nga (Ha Dong) buc xuc.

Con anh Tran Ngoc Sy, khach hang Viettel phan anh: "Di qua mot so khu vuc, gui tin nhan mai moi duoc, tham chi co lan khong the gui tin nhan, den mot luc sau lai nhan rat nhieu tin nhan bao gui di va gui den don dap cung mot luc".

Khong co chuyen song 3G chen 2G

Giai thich hien tuong nay, ong Tran Tuan Hung (Khoa Dien tu - Vien thong, DH Bach Khoa Ha Noi) cho biet: "Song 3G khong the chen song 2G, vi tan so cua 3G hoan toan khac 2G, 2G co tan so 900 MHz, trong khi do 3G co tan so tu 1.800 den 2.100 MHz, do do ve nguyen tac thi tin hieu cua 2 loai song nay khong lien quan gi den nhau".

Cung theo ong Hung, phuong phap dieu che tin hieu song 2G va 3G khac nhau. 2G dua tren nen TDMA (Time Division Multiple Access) va nen CDMA (Code Division Multiple Access). Con 3G dua theo chuan WCDMA (Wideband Code Division Multiple Access), la mot trong nhung mang tien tien hien nay, phu hop cho cac mang cong nghe GSM 2G chuyen tiep len 3G.

Hien tuong khach hang phan anh nhu tren, ong Tran Tuan Hung thua nhan la co, nhung do khong phai la song 3G chen 2G, ma do tan so cua 3G manh hon 2G, nen trong thoi diem nao se tu dong nhay sang, hay trong truong hop khach hang vao vung mat song, hay song yeu se xuat hien 3G.

"Hien song 3G moi dang trong qua trinh thu nghiem, chua cung cap chinh thuc, nen chua the thuc hien duoc cuoc goi hay nhan tin" - ong Hung giai thich them.

Dai dien cac hang MobiFone, VinaPhone, Viettel cung dong quan diem tren. Tien si Nguyen Van Yen - Truong ban 3G cua VinaPhone cho biet, mot so may dien thoai, neu khach hang de o che do chon mang tu dong, trong pham vi ban kinh vai tram met song 3G van co the at song 2G, khi do may dien thoai cua khach hang co hien chu 3G, nhung vi dang trong qua trinh thu nghiem chua the truy cap tu song 3G, dan den hien tuong khach hang khong the lien lac.

Chi can chinh che do

De han che tinh trang tren, ong Tran Tuan Hung dua ra giai phap, nen dat che do mang (Network mode) trong dien thoai la GSM (thay cho Dual Mode o mot so dien thoai doi cao co ho tro 3G). Hoac neu khach hang thay khong thich hay phien ha, co the vao phan cai dat tat han chuc nang 3G tren dien thoai.

Ong Le Ngoc Minh - Giam doc Cty MobiFone khang dinh, day la mang tien tien theo xu the phat trien tat yeu cua cong nghe thong tin di dong. Voi mang 3G, nguoi tieu dung co thuan loi trong viec giai tri, ket noi du lieu ... Du vay, nguoi tieu dung co the kiem soat song 3G cung nhu 2G bang viec cai dat trong may dien thoai.

"Trong tuong lai, toi nghi mang 3G trien khai se mang tinh kha thi cao, vi la xu huong phat trien tat yeu, cung voi nhieu tinh nang ma 3G mang lai, chac chan nhieu khach hang se chon. Mac du chua cong bo gia cuoc khi su dung mang 3G, nhung theo thong tin tu cac hang tung cho biet mang 3G se khong cao hon gia cuoc dich vu 2G hien nay"- Ong Hung nhan dinh.

Cung theo gioi chuyen mon, sau khi dich vu 3G trinh lang, giua cac mang di dong se dien ra cuoc dua giam gia cuoc, khuyen mai.

Mang 3G (third-generation technology) la cong nghe truyen thong the he thu ba, cho phep truyen ca du lieu thoai va du lieu ngoai thoai (tai du lieu, gui email, tin nhan nhanh, hinh anh...). Va diem noi bat nhat cua mang 3G so voi mang 2G nam o kha nang cung ung truyen thong goi toc do cao nham trien khai cac dich vu truyen thong da phuong tien tren mang di dong. Toc do truyen du lieu mang 3G se cao hon rat nhieu so voi mang 2G.

Bo Thong tin va Truyen thong vua trao giay phep 3G cho bon doanh nghiep la VinaPhone, MobiFone (thuoc Tap doan Buu chinh Vien thong Viet Nam - VNPT), Viettel va lien danh EVN Telecom va HNTelecom. Trong do, mang 3G cua VinaPhone da vua khai truong ngay 12/10 vua qua va la nha mang dau tien cua Viet Nam trien khai cong nghe mang 3G.

(Theo Pham Huong/bee.net.vn)



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