ZTE promises major boost to HSPA performance
Published: 19 December, 2008
The pressure on operators to conserve their capex funds during the economic crisis is throwing HSPA and HSPA+ into the spotlight, as ways for 3G carriers to upgrade their networks with less cost and risk than a full LTE deployment. Vendors are rushing to tweak the standard to eke out the maximum performance, and China's ZTE is claiming improved cell throughput via a proprietary extension called HSPA MX.
This technology can be applied to any HSPA system, but the company will particularly position it as an upgrade for the homegrown Chinese 3G standard, TD-SCDMA, with its eyes on China Mobile's massive deployment in 2009-2010. Mobile has already expressed dissatisfaction with the performance of the technology that it has been forced to adopt, compared to W-CDMA, and will be looking for ways to boost the power of its network, alongside its plans for an early adoption of LTE.
ZTE's trademarked technology boosts HSPA even further than the addition of 64QAM signal modulation and MIMO antenna arrays, the trademarks of HSPA+, claims the vendor, by combining its MX algorithm with SDMA (space division multiple access) techniques. This mixture can increase cell throughput by 60% to 100% compared to basic 3G in TDD spectrum, as used in China, by increasing the reuse of frequencies, time slots and code channels, according to a ZTE presentation. In turn, this claims to reduce the cost per bit in networks by up to 36%.
"The reduction of capex per bit enables operators to provide better tariffs to stimulate consumption and attract more subscribers," said Isaac Liang, international director for ZTE's TD-SCDMA product line. HSPA MX is a software upgrade and ZTE will soon start trialling it with non-Chinese systems.
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