Showing posts with label CDMA 2000. Show all posts
Showing posts with label CDMA 2000. Show all posts

CDMA 2000 forward channel

CDMA 2000 user is assigned a forward channel that consists of the following combination :
  1. Forward fundamental channel  (F-FCH)
  2. 0-7: Forward supplemental code channel (F-SCHs) for both RC1 and RC2
  3. 0-2: Forward supplemental code channel (F-SCHs) for both RC3 and RC
The different forward/downlink physical channel are : 
  1. Forward pilot channel (F-PICH)
  2. Forward auxiliary pilot channel (F-APICH)
  3. Forward transmit diversity pilot channel (F-TDPICH)
  4. Forward sync channel (F-SYNC)
  5. The forward paging channel (F-PCH)
  6. Forward broadcast channel (F-BCH)
  7. The forward quick paging channel (F-QPCH)
  8. The forward common power control channel (F-CPCCH)
  9. Forward supplemental channel (F-SCH)
  10. Forward common assignment channel (F-CACH)
  11. The forward dedicated control channel (F-DCCH)
  12. The forward data traffic channel 
1. Forward pilot channel (F-PICH)
This channel is used to get multipath fading and channel conditions. This channel is shared by mobile nodes to obtain the above mentions information.

2. Forward auxiliary pilot channel (F-APICH)
Every channel is allocated a unique Walsh code under the code-multiplexed method in a downlink.

3. Forward transmit diversity pilot channel (F-TDPICH)
When increased RF capacity this channel is used. In these channels are intended for synchronization by the mobile with a specific cell.

4. Forward sync channel (F-SYNC)
For providing initial synchronization related data to the mobile station this channel is used. 

These are two types of forwarding sync channel that are used :
  • Shared sync channel
  • Wide-band sync channel
5. The forward paging channel (F-PCH)
The base station uses this channel in order to transmit the mobile station specific message and the overhead message. 

These are two types of forwarding paging channel are used :
  • Shared paging channel
  • Wide-band paging channel
6.  Forward broadcast channel (F-BCH)
It is intended to transmit control information to the respective mobile stations effectively that have not been allocated a traffic channel.

7. The forward quick paging channel (F-QPCH)
This quick paging channel is used by the paging channel for providing control information to the mobile stations.

8. The forward common power control channel (F-CPCCH)
The necessary power control information of uplink common control channel is conveyed by base stations using this channel.

9. Forward supplemental channel (F-SCH)
Up to two F-SCHs can be assigned to a single mobile unit for high-speed data ranging from 9.6 to 153.6 kbps in release 0.

10. Forward common assignment channel (F-CACH)
The quick assignment of a reverse common control channel is done by the base station using this channel.

11. Forward common assignment channel (F-CACH)
 It is used to send high layer message to the mobile units. This channel is used by the base station.

12. The forward dedicated control channel (F-DCCH)
  • It replaces the dim and burst and blank and burst
  • It is used for messaging and control for data calls
  • In addition to these channel forward data, a traffic channel is also used in forwarding channels in the CDMA 2000 standard

The minimum configuration consists of a reverse pilot channel to enable the base station (BS) to perform synchronous detection and reverse fundamental channel for voice.

CDMA 2000 reverse channel

The reverse link for CDMA 2000 has properties similar to the forward link of a signal. 
And also have CDMA 2000 user is assigned a forward channel that consists of the following combination :

  1. Forward fundamental channel  (F-FCH)
  2. 0-7: Forward supplemental code channel (F-SCHs) for both RC1 and RC2
  3. 0-2: Forward supplemental code channel (F-SCHs) for both RC3 and RC
The minimum configuration consists of a reverse pilot channel to enable the base station (BS) to perform synchronous detection and reverse fundamental channel for voice.
The different reverse channel is:
  1. Reverse supplemental channel (R-SCH)
  2. Reverse pilot channel (R-PICH)
  3. The reverse dedicated control channel (R-DCCH)
  4. Reverse enhanced access channel (R-EACH)
  5. The reverse common control channel (R-CCCH)
  6. Reverse fundamental channel (R-FCH)
  7. Reverse supplemental code channel (R-SCCH)
1. Reverse supplemental channel (R-SCH)
When the data rate is greater than 9.6 kbps, an R-SCH is needed. R-SCH channel is assigned for power control. A total of one or two R-SCH can be assigned per mobile unit.

2. Reverse pilot channel (R-PICH)
It provides pilot and power control information. It enables the mobile unit to transmit a lower power level and allow to inform the base station of the forward power levels being received, enabling the base station to reduce power.

3. Reverse enhanced access channel (R-EACH)
R-EACH is used to initiate communication with the base station. It is used by a mobile station, This channel also reduces the access channel power.

4. The reverse common control channel (R-CCCH)
This channel is used by the mobile unit to send their data information after they have granted access.

5. The reverse dedicated control channel (R-DCCH)
This channel replaces the dim and burst and the blank and burst. It is used for messaging and control for data calls.

6. Reverse fundamental channel (R-FCH)
This channel is used for voice and data payload. R-FCH is allowed shorter frame, this shorter frame can be used lower latency.

7. Reverse supplemental code channel (R-SCCH)
This channel is the same as F-SCCH and same it can be used with radio configuration. 

Application of CDMA 2000

  • Wireless internet
  • Location-based services
  • Wireless email 
  • Steaming video games
  • Telemetry
  • Wireless telecommunication
  • Longer standby battery life
  • Enterprise solutions
  • Wireless commerce
  • Web browsing
  • Multimedia services
  • Future demand for data service

Advantages of CDMA 2000

CDMA 2000 has unique features, benefits, and performance so it provides better advantages like high-voice capacity and high-speed packet data. Now we can check some more advantages one by one below.
  • Industry-leading performance.
  • Device selection.
  • Flexible migration path.
  • Flexible network architecture.
  • New common channel structure and operation.
  • Ubiquitous idle time operation.
  • Global roaming and multi-mode, multiband devices.
  • Flexible spectral allocation and efficient use of spectrum.
  • New MAC states for efficient.
  • Support for advanced mobile service.
  • Seamless Evolution path.
  • Quick paging channel operation.
  • Reverse link gated transmission.
  • Superior voice quality.
  • High-speed broadband data connectivity. 
  • Improve securities and privacy.
  • Multi-mode, multiband global roaming features. 

CDMA 2000

What is CDMA 2000? 

Before we learn about CDMA 2000 first let us learn about what is full form of CDMA. CDMA 2000 is code division multiple access version of the IMT-2000 standard developed by the International Telecommunication Union. 

 CDMA 2000 also known as the IMT-CDMA multi-carrier or the 1xRTT.

 Overview :
  • CDMA 2000 is a high data rate upgrade path for current users of 2G and 2.5G CDMA standard. It is a unique radio and network access system that is part of the international telecommunication called 2000. It is called a 3G standard.
  • CDMA 2000 allows the basically same spectrum, bandwidth, RF equipment, and air interface framework to be used at each station.
  • The first CDMA air interface CDMA 2000  with 1 × RTT (Radio transmission technology language) indicates that a single 1.25 MHz radio channel used.
  • CDMA 1x support data rate up to 307 kbps for a single user in packet mode. It can provide a throughput rate of up to 144 kbps depending on the propagation conditions.
  • CDMA 1xEV as an also part of IMT 2000. Its provide CDMA carrier with the option of installing radio channel with data only or data and voice only.
  • CDMA 2000 3xRTT standard is used for three adjacent 1.25 MHz radio channel. It can be used together to provide instantaneous packet data.
  • This article gives information about Feature, advantages, application of CDMA 2000 to gives more information about CDMA 2000.
A feature of CDMA 2000 :  
  • Support high-speed data service.
  • It is a global standard.
  • It has the flexibility for evolution.
  • It has improved spectrum efficiency.
  • Support advance mobile service.
  • Leading performance.
  • Industry-leading performance
  • Device selection
  • Flexible migration path
  • Flexible network architecture
  • New common channel structure and operation
  • Ubiquitous idle time operation
  • Global roaming and multi-mode, multiband devices
  • Flexible spectral allocation and efficient use of spectrum
Let us check is out the application of CDMA 2000 given below :

 Application of CDMA 2000 :
  • It is developed for both mobile radio and cordless application
  • Wireless internet
  • Location-based services
  • Wireless email
  • Telemetry
  • Wireless telecommunication
  • Longer standby battery life
  • Wireless commerce
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