Performance analysis of WCDMA wireless access standard | SpringerLink
Log In Sign Up. AbdelLateef Ahmed. Many manufacturers have already carried out their commercial trials in Europe and Asia. The first generation is the analog cellular mobile communication network in the time period from the middle of s to the middle of s. The most important breakthrough in this period is the concept of cellular networks put forward by the Bell Labs in the s, as compared to the former mobile communication systems.
The cellular network system is based on cells to implement frequency reuse and thus greatly enhances the system capacity. It is widely applied in Britain, Japan and some Asian countries. However, their defects are also obvious: 1 Low utilization of the frequency spectrum 2 Limited types of services 3 No high-speed data services 4 Poor confidentiality and high vulnerability to interception and number embezzlement 5 High equipment cost 6 Large volume and big weight To solve these fundamental technical defects of the analog systems, the digital mobile communication technologies emerged and the second generation mobile communication systems represented by GSM and IS came into being in the middle of s.
Since the 2G mobile communication systems focus on the transmission of voice and low-speed data services, the 2. The CDMA system has a very large capacity that is equivalent to ten or even twenty times that of the analog systems. It also has good compatibility with the analog systems. The major services of mobile communications are currently still voice services and low-speed data services.
W-CDMA: Mobile Communications System
With the development of networks, data and multimedia communications have also witnessed rapid development; therefore, the target of the 3G mobile communication is to implement broadband multimedia communication. The 3G mobile communication systems are a kind of communication system that can provide multiple kinds of high quality multimedia services and implement global seamless coverage and global roaming.
They are compatible with the fixed networks and can implement any kind of communication at any time and any place with portable terminals.
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It adopts the WCDMA technologies of Europe and Japan to construct a new radio access network and smoothly evolves a core switching network from the existing GSM mobile switching network to provide more diversified services. The cdma and UWC technologies are applied for radio access and the cdma technologies adopt the Qualcomm patents to a large extent.
- W-CDMA Mobile Communication Systems by Keiji Tachikawa.
- The Days of the French Revolution.
- Deployment Scenario.
- Harmonised Standards for IMT-2000!
- rowlitirense.mlteristics of W-CDMA | About DOCOMO | NTT DOCOMO!
- WCDMA / HSPA / HSPA+ Technology;
It relates to the reuse of the existing networks the construction of new networks should not be the optimal solution and the development of multiple 2G digital network systems towards the same standard. Its purpose is to provide the mixture of multiple services at different air interface subscriber rates with the single physical layer structure. Its benefits lie in the higher data rates up to 64 kbps; the maximum data rate depends on the manufacturers and the use of the existing GSM data technologies by slightly modifying the GSM system.
It can satisfy all the requirements listed by the ITU to provide very effective high-speed data services and high quality voice and image services. As the change of the air interface is revolutionary, so is the evolution of the radio access network part. The cdma 1X EV with enhanced technologies can provide higher performances.
These two are basically the same in essence can they can coexist in the same carrier. For the cdma system, the gradual replacement method can be applied in the transition from 2G systems to 3G systems. In other words, one carrier of the 2G systems can be compressed to become a 3G carrier to provide the services of medium and higher rates to the subscribers.
As the 3G systems have more and more subscribers, the number of carriers used in the 2G systems can be gradually reduced while more carriers can be added to the 3G systems. Through this kind of smooth upgrading, the network operators can not only provide various latest serves to the subscribers but also well protect the investment of the existing equipment. From the point of view of the BTS, the radio parts such as antenna, RF filters and power amplifiers are all reusable while the baseband signal processing part needs to be replaced.
This means that there may be more than one radio interface standard but the concept of more than one standard is not yet accepted, rather, these different standards are expected to ultimately form a unified standard. The following two factors have caused various technical differences: 1 Relationship with 2G The network part must be compatible with 2G, that is, the 3G networks are gradually evolved from the 2G networks.
The correspondence between the core networks and the radio interfaces is shown in Figure below: Confidential Information of Huawei. Because the USA requires the sharing of frequency spectrum with 2G systems, the backward compatibility of the radio interfaces is especially emphasized and technically the USA requires gradual evolution. It then follows up with principles, design constraints, and more advanced insights into radio interface protocol stack, operation, and dimensioning for three major mobile network technologies: Global System Mobile GSM and third 3G and fourth generation 4G mobile technologies.
The concluding sections of the book are concerned with further developments toward next generation of mobile network 5G. The last section describes some key concepts that may bring significant enhancements in future technology and services experienced by customers.
W-CDMA: Mobile Communications System
Written as a modified and expanded set of lectures on wireless engineering taught by the author, Introduction to Mobile Network Engineering: GSM, 3G-WCDMA, LTE and the Road to 5G is an ideal text for post-graduate and graduate students studying wireless engineering, and industry professionals requiring an introduction or refresher to existing technologies. Permissions Request permission to reuse content from this site. Undetected location.
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