CDMA2000 Wireless Communications System (3)



CDMA2000 Wireless Communications System (3)

CDMA2000



4. 1xEV-DO Revision A

CDMA2000 1xEV-DO Revision A (Rev. A) (TIA-856-A) is an evolution of 1xEV-DO Rel.  That increases the peak data rate on the reverse and forward links to support a wide-variety of symmetric, delay-sensitive, real-time, and concurrent voice over IP (VoIP) and advanced broadband data applications. It also incorporates Orthogonal Frequency Division Multiplexing (OFDM) technology to enable multimedia broadcast and multicasting services (MBMS) or one-to-many content delivery.


Features of Rev. A include:

• Advanced Broadband Data:

 Supports peak data rates of up to 3.1 Mbps in the forward link and 1.8 Mbps in the reverse link within a 1.25 MHz FDD radio channel.

• Higher Spectral Efficiency:
 Rev. A’s increased rate quantization on both the forward and reverse links enables a more efficient use of the air link resources, better network utilization and a lower cost of delivery. It supports 1.2 times EV-DO Rel


• Increased Capacity:

 On both the forward and reverse link, Rev A. allows operators to support more users and it improves the cost of delivering IP-based voice, data and multimedia services.


• Symmetry: 

By increasing uplink speeds, Rev. A is the first commercially available wireless technology to deliver a true synchronic broadband experience

• Low Average Latency:
 Below 50 msec node-to-node ping, RTT - making it ideal for delay-sensitive applications.

• Advanced Quality of Service (QoS): 
Supports the prioritization and delivery of individual packets based on the type of application or user profile. These mechanisms ensure a consistent, high-quality user experience.

• Advanced Services: 
Enables the enhanced performance of real-time broadband, symmetric data link, and delay sensitive services such as VoIP, push-to-talk (PTT), push-to-media (PTM), video conferencing, multicasting, see what I see (SWIS), and rich 3D gaming with multiple players.

• Backwards compatibility:
 Supports existing Rel. 0 applications and devices. This inherent backwards compatibility preserves an operator’s previous network investments. Rev. A is also backwards compatible with CDMA2000 1X and cdmaOne systems.

5. Multicarrier EV-DO and EV-DO Revision B
Multicarrier EV-DO and EV-DO Revision B (Rev. B) are evolutionary steps from CDMA2000 1xEV-DO Rev. A that further enhance the broadband user experience and increase network capacity through a software and hardware upgrade, respectively. 
           

Features of Multicarrier EV-DO and EV-DO Revision B:

• Multi-mega-bit-per-second Broadband Speeds: 

Multicarrier EV-DO and Rev. B peak data rates are proportional to the number of carriers aggregated. The standard supports the aggregation of up to 15 channels in 20 MHz bandwidth, yet the most common configuration is an aggregation of three carriers within a 5 MHz channel. In this implementation, the Multicarrier EV-DO software upgrade delivers a peak data rate of 9.3 Mbps in the downlink and 5.4 Mbps in the uplink, and with a Rev. B hardware upgrade, the peak data rate in the downlink increases to 14.7 Mbps.


• Higher Spectral Efficiency:

Another benefit of the increased bandwidth is greater spectral and network efficiencies. The multi-carrier implementation allows high aggregate data rates to be transmitted with less energy per bit which in turn reduces interference and increases overall spectral efficiencies. 


• Very Low Average Latency: 

Below 35 milliseconds node-to-node, RTT - making it ideal for delay-sensitive applications.


• Advanced Quality of Service (QoS): 

Supports the prioritization and delivery of individual packets based on the type of application or user profile. These mechanisms ensure a consistent, high-quality user experience.


• Advanced Services: 

With multi-mega-bit-per-second broadband speeds, Multicarrier EV-DO and Rev. B can offer advanced broadband connections in the mobile environment and support bandwidth-intensive applications.


• Backwards Compatibility: 

Multicarrier EV-DO and Rev. B networks support existing Rev. A and Rel. 0 applications and devices. The upgrade from Rev. A to Multicarrier EV-DO requires a simple software upgrade in the network. For the enhanced performance of Rev. B, a new channel card is required. Rev. B handsets will operate on the Rev. A and Rel. 0 networks. Rev. B is backwards compatible with 1X and cdmaOne systems through multi-mode devices.

6. DO Advanced
The basic tenet of DO Advanced is to make existing EV-DO networks and devices perform as efficiently as possible by exploiting unevenly loaded networks, and to do so without substantial changes to existing infrastructure. 

The software-upgradeable Smart Network techniques enabled by DO Advanced are fairly easy to implement, and their impact on overall network performance can be quite dramatic. To the extent an operator takes advantage of newly enhanced devices, additional gains can be realized.

DO Advanced is comprised of a variety of features which can be introduced in an EV-DO Revision A (Rev. A), Multicarrier EV-DO or EV-DO Rev. B network. DO Advanced leverages two basic characteristics of today’s mobile data traffic, namely that the mobile data traffic across an operator’s network is never uniformly distributed in space and time, and that many of the data sessions are relatively short in duration.

Instead of adding capacity across an entire network, DO Advanced allows an operator to dynamically allocate existing network capacity where and when it is needed the most. In most cases, the “Smart Network” features of DO Advanced only require software changes in the infrastructure with many of its benefits extending to legacy devices. Unlike any other network upgrade, the increase in network capacity and the improvement in user experience can be realized immediately without requiring a lengthy device migration strategy.

DO Advanced also introduces features which can help optimize an operator’s network to support a large number of mobile devices by minimizing the signaling overhead associated with these devices attaching and disconnecting from the network. To the extent this overhead is minimized it frees up even more network capacity. Plus, DO Advanced includes new features which will improve the performance of mobile devices, including faster data rates and extended battery life. Although DO Advanced does not require new devices, these features will eventually become enabled since they are part of the CDMA2000 chipset roadmap.


----------------------------------------------------------------



CDMA 2000 Wireless Communications System,wireless Communications channel,
4G Communications,Two-Ray Model In 4G wireless Communications channel
CDMA 2000 Wireless Communications System,wireless Communication channel,
Two-Ray Model In 4G wireless Communications channel,wireless Communications channel,
CDMA 2000 Wireless Communications System in 4G communication,wireless Communication channel in 4G communication ,
Two-Ray Model In 4G wireless Communications channel in 4G communications,wireless Communications channel in 4G communications,
Two-Ray Model In 4G 4G wireless Communication channel,4G wireless Communication channel,


Cdma2000 Single Cell Systems  intro to Cdma 2000 Cellular Systems 1st & 2nd Generations  2nd Generation Standards GSM Phases


0 comments:

Post a Comment

Powered by Blogger.

Blog Archive