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Tuesday, January 17, 2012

HSPA+ Advanced Smart Networks: Multipoint Transmission

Rapid wireless subscriber growth coupled with the necessity to provide desired levels of user experience for broadband multimedia applications has led to the continuous evolution of HSPA technology. Some of the initially developed HSPA+ features, such as Higher Level Modulation and MIMO, focused on increasing spectral efficiency by taking advantage of favorable channel conditions when available. More recently introduced features such as Dual-Carrier HSPA (DC-HSPA) and Multicarrier HSPA (MC-HSPA) exploit the multiplexing gain achievable when transmitting bursty data over multiple frequency carriers. All these features were enabled by enhancing radio transceiver chain design, both on the network side and in the mobile device (UE).  

Even with advanced radio transceivers in place, there is still scope for improving cell edge user experience. Even though many current HSPA networks are plagued with issues of capacity saturation and inadequate cell edge performance, neither the capacity nor the quality potential of the network as a whole is fully reached. 

Adjacent sectors and frequency carriers are often unevenly loaded; different topological layers in the network (e.g. macro, pico, femto) are sometimes unevenly loaded as well. Most UEs with poor serving cell data rates can often receive signals from other cells which are yet fully exploited in HSPA+. The next step in the evolution of HSPA must take all this into consideration. READ THIS WHITEPAPER FOR FURTHER INSIGHTS:


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