Cov txheej txheem:

Fach yog dab tsi hauv UMTS?
Fach yog dab tsi hauv UMTS?

Video: Fach yog dab tsi hauv UMTS?

Video: Fach yog dab tsi hauv UMTS?
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Anonim

FACH - Nkag mus rau Channel. A UMTS thauj channel uas tsim cov downlink ib nrab ntawm kev thauj channel khub hu ua RACH (Random Access Channel) / FACH (Forward Access Channel) ua ke. Nws yog siv rau downlink signaling thiab me me ntawm cov ntaub ntawv.

Ntawm no, hom channel siv hauv 3g yog dab tsi?

3G UMTS kev thauj mus los muaj xws li:

  • Dedicated Transport Channel (DCH) (nce thiab downlink).
  • Tshaj Tawm Channel (BCH) (downlink).
  • Forward Access Channel (FACH) (down link).
  • Paging Channel (PCH) (downlink).
  • Random Access Channel (RACH) (uplink).
  • Uplink Common Packet Channel (CPCH) (uplink).

Ib sab saum toj no, RRC xeev hauv UMTS yog dab tsi? Xov tooj cua Resource Control ( RRC ) raws tu qauv siv nyob rau hauv UMTS thiab LTE ntawm huab cua interface. Nws yog ib txheej uas muaj nyob nruab nrab ntawm UE thiab eNB thiab muaj nyob rau theem IP. Kev ua haujlwm ntawm lub RRC yog coj los ntawm a xeev tshuab uas txhais tej yam tshwj xeeb xeev tias UE tuaj yeem nyob hauv.

Kuj nug, UMTS network txuas txhais li cas?

UMTS (Universal Mobile Telecommunications Service) yog ib tiam thib peb (3G) broadband, pob ntawv-raws li kis tau tus mob ntawm cov ntawv nyeem, digitized suab, video, thiab multimedia ntawm cov ntaub ntawv tus nqi mus txog 2 megabits ib ob (Mbps). UMTS yog ua raws li Ntiaj Teb System for Mobile (GSM) kev sib txuas lus tus qauv.

Puas yog Wcdma 3g?

Yog lawm, WCDMA yog FDD version ntawm UMTS (qhov nrov tshaj plaws 3 G technology nyob rau hauv lub ntiaj teb no). UMTS sib koom tib lub core network li GSM, tab sis nws yog ib qho kev siv tshuab sib txawv.

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