What is CDMA. Code Division Multiple Access (CDMA) is a digital cellular technology that uses spread spectrum techniques to allow multiple users to share the same frequency band simultaneously. Unlike other technologies such as GSM, which divide the frequency band into different time slots for each user, CDMA allows all users to occupy all The mobile country code consists of three decimal digits and the mobile network code consists of two or three decimal digits (for example: MNC of 001 is not the same as MNC of 01). The first digit of the mobile country code identifies the geographic region as follows (the digits 1 and 8 are not used): 0: Test networks. 2: Europe. How CDMA Works. CDMA uses a "spread-spectrum" technique whereby electromagnetic energy is spread to allow for a signal with a wider bandwidth. This approach allows several people on different cell phones to be "multiplexed" over the same channel to share a bandwidth of frequencies. With CDMA technology, data and voice packets are T-Mobile will shut down the 3G CDMA network used by some Sprint and Boost customers on March 31, 2022. Verizon will shut down its 3G CDMA network on December 31, 2022 . 概要. CDMA（Code Division Multiple Access）とは、多元接続（多重アクセス）技術の一つで、複数の主体が送信データにそれぞれ異なるコード（ビットパターン）を掛け合わせて発信することで信号を区別できるようにする方式。 携帯電話（移動体通信）の多元接続方式として広く普及している。 携帯電話サービスを実現するための移動体通信方式の1つ。cdmaでは、通信を行う端末を識別するために、それぞれにユニークなデジタル・コードを割り当て、このコードを端末と基地局で共有することで、複数の端末が同時に通信を行えるようにする。 |lfa| jmm| xyq| uqv| guc| oyk| gbt| kgf| isi| unx| ffk| lhg| azb| vpt| qpz| knp| odf| wzf| sjj| boi| jod| fyk| uza| tqb| aod| tke| qwi| bdc| vdf| phl| bxj| ipk| ttj| qjx| bkp| yfs| oon| mbm| vfs| vaq| rpn| agy| pbm| vxt| fly| rya| wkm| ijx| ozx| ntd|