What is Fach in UMTS?
A UMTS transport channel that forms the downlink half of a transport channel pair known as the RACH (Random Access Channel) / FACH (Forward Access Channel) combination. It is used for downlink signalling and small quantities of data.
What are UMTS data channels?
The UMTS channels are communication channels used by third generation (3G) wireless Universal Mobile Telecommunications System (UMTS) networks. UMTS channels can be divided into three levels: Physical. Transport.
What is the minimum spectrum allocation required by Wcdma?
Explanation: W-CDMA/UMTS requires a minimum spectrum allocation of 5 MHz. Using this bandwidth, it has the capacity to carry over 100 simultaneous voice calls.
Which of the following channels are used for downlink in GSM or UMTS?
UMTS Transport channels
| UMTS/WCDMA Transport Channel | Function | Direction |
|---|---|---|
| Forward access channel(FACH) | It is used to transfer user data/control signalling messages | Downlink |
| Downlink shared channel(DSCH) | It is used as shared channel carrying dedicated user data/control messages in the downlink | Downlink |
What are three channel types that are used in UMTS?
The 3G UMTS transport channels include:
- Dedicated Transport Channel (DCH) (up and downlink).
- Broadcast Channel (BCH) (downlink).
- Forward Access Channel (FACH) (down link).
- Paging Channel (PCH) (downlink).
- Random Access Channel (RACH) (uplink).
- Uplink Common Packet Channel (CPCH) (uplink).
What are the channel types used in UMTS discuss the role of each channel type also discuss the responsibility of RNC and Node B in the UMTS network?
Physical downlink shared channel (PDSCH) carries DSCH; shared by users based on code multiplexing; associated with DPCH….1. UMTS Air Interface.
| Sr.no | Parameters | Specifications |
|---|---|---|
| 2 | Channel bandwidth | 5MHz |
| 3 | Chip rate | 3.84 Mcps |
| 4 | Duplexing technique | FDD and TDD modes |
| 5 | Modulation scheme | Direct sequence CDMA and QPSK |
When was the UMTS radio frequency band created?
UMTS frequency bands. The UMTS frequency bands are radio frequencies used by third generation (3G) wireless Universal Mobile Telecommunications System networks. They were allocated by delegates to the World Administrative Radio Conference (WARC-92) held in Málaga-Torremolinos, Spain between 3 February 1992 and 3 March 1992.
Are there any recognised bands for 3G UMTS?
Although there are many bands and frequencies available now for mobile telecommunications, 3G UMTS had a number of recognised bands that were widely used for carrying these services.
How are the UMTS channels spaced by 5 MHz?
UMTS uses wideband CDMA as the radio transport mechanism and the UMTS frequency channels are spaced by 5 MHz. The UMTS signal bandwidth is normally considered to be 5 MHz but this figure includes the 0.58 MHz guard bands either side.
What kind of spectrum is used in UMTS?
UMTS frequency bands are spectrum allocations dedicated to use for 3G Universal Mobile Telecommunications System networks. Bands are harmonised internationally via the 3GPP 25.101 standard.