Saturday, March 26, 2011
Sunday, February 6, 2011
4G Mobile Broadband Evolution: 3GPP Release 10 and Beyond - HSPA+, SAE/LTE and LTE-Advanced
4G Americas white paper provides detailed information on the status of IMT-Advanced, on 3GPP Rel-10 including HSPA+ enhancements and the introduction of LTE-Advanced, and the planning for Rel-11 and beyond.
Additional information on Rel-9 is included in Appendix B and includes a complete update to Section 6 of the 3G Americas white paper, 3GPP Mobile Broadband Innovation path to 4G: Release 9, Release 10 and Beyond-HSPA+, LTE/SAE and LTE-Advanced, which was published in February 2010 (and therefore did not contain some additional changes to the standards before their publication in March 2010). This paper has been prepared by a working group of 4G Americas' member companies and the material represents the combined efforts of many leading experts from 4G Americas’ membership.
Wednesday, December 22, 2010
Next generation LTE, LTE-Advanced or LTE Rel-10 is the next step in radio access technology
Whatever the name – next generation LTE, LTE-Advanced or LTE Rel-10 – the next step in LTE evolution allows operators to introduce new technologies without putting existing investments at risk.
LTE radio access technology is continuously evolving to meet the requirements of regulators, operators and users. The first fully commercial and operational 4G mobile broadband systems, currently being deployed, are based on the first release of LTE, 3GPP Rel-8, which was finalized in 2008. Rel-9, finalized at the end of 2009, added support for broadcast/multicast services, positioning services, and enhanced emergency call functionality, as well as enhancements for downlink dual-layer beam forming.
Authors : Stefan Parkvall, Anders Furuskär, Erik Dahlman
Sunday, December 12, 2010
Carrier Aggregation for LTE-Advanced
To meet LTE-Advanced requirements, support of wider transmission bandwidths is required than the 20 MHz bandwidth specified in 3GPP Release 8/9. The preferred solution to this is carrier aggregation. It is of the most distinct features of 4G LTE-Advanced. Carrier aggregation allows expansion of effective bandwidth delivered to a user terminal through concurrent utilization of radio resources across multiple carriers. Multiple component carriers are aggregated to form a larger overall transmission bandwidth.
3GPP specifies carrier aggregation in LTE as following
- Rel-8/9 backward compatible carriers are the basic building blocks and to be supported
- Rel-10 signalling to support aggregation of up to 5 DL of component carriers and 5 UL of component carriers, irrespective of intra- or inter-band Carrier Aggregation (CA).
- Rel-10 to support both intra- and inter-band aggregation for both DL & UL in FDD
- Rel-10 to support inter-band aggregation with different signal reception timings across of component carriers of different bands for FDD DL
- UE-specific asymmetric number of component carriers in DL and UL
- Component carriers can have any of the bandwidths supported in Rel-8
Contiguous & non-contiguous carrier aggregation
Two or more component carriers can be aggregated to support wider transmission bandwidths up to 100 MHz. Spectrum deployment can be either contiguous or non-contiguous. Support for carrier aggregation feature requires enhancement to the 3GPP LTE Release 8 & 9 physical, MAC, and RRC protocol layers. To an LTE Release 8 terminal, each component carrier will appear as an LTE carrier, while an LTE-Advanced terminal can use the total aggregated bandwidth.
source: LteWorld
Saturday, December 4, 2010
The Path to 4G: LTE and LTE-Advanced
Presented by James Seymour, Senior Director, Alcatel-Lucent.
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