Tuesday 22 April 2008

More on LTE-Advanced

LTE-Advanced should be real broadband wireless networks that provide equal or greater peak data rates than those for wired networks, i.e., FTTH (Fiber To The Home), while maintaining equivalent QoS. Smooth introduction of LTE-Advanced should be possible on top of LTE system.

High-level requirements
•Reduced network cost (cost per bit)
•Better service provisioning
•Compatibility with 3GPP systems


WRC 07 identified the following new bands for use by IMT/IMT-Advanced:

  • 450−470 MHz band,
  • 698−862 MHz band,
  • 790−862 MHz band,
  • 2.3−2.4 GHz band, and
  • 3.4−3.6 GHz band.

Not all of these bands are available on a worldwide basis. These bands are in addition to the bands currently specified in 3GPP. Specification for C-band should not be restricted to 3.4 – 3.6 GHz, but cover 3.4 to 3.8 and even 3.4 to 4.2 GHz as these will likely become available in some countries.

Channel Bandwidth

  • Channel bandwidths up to 100 MHz to be specified
  • However, for many operators consecutive allocation of 100 MHz unlikely
  • optimised performance needed for smaller bandwidths of e.g. 50 MHz low cost/complexity (i.e. not fully flexible) resource aggregation to be considered
Interworking with legacy 3GPP RAT
  • Full low complexity (for NW and terminal) interworking with 3GPP RAT, so operator de facto has flexibility on technology to deploy, when and where. The networks of most operators will be a combination of multiple 3GPP RAT for many years to come.
  • Network Sharing: Support for at least all currently specified Network Sharing features, also to facilitate cost-efficient roll out of LTE-Advanced, including, but not limited to, rural area coverage.
Working Methods
  • As LTE-Advanced should be an evolution of LTE, it is essential that it is specified as part of the 36-series of specifications.
  • It is also essential work is performed to a large degree by the experts that developed LTE, and thus work ideally should be performed in existing Working Groups.
  • LTE-Advanced will likely constitute the next significant development step for LTE, but (smaller) stand-alone enhancements and additions to LTE should be possible, and progressed in parallel.
  • Some of these smaller enhancements, as well as the “corrections” to LTE Release 8 could/should be captured in Rel.9, where SAE considerations will lead to relatively short Release completion time-frame.
More details on LTE-Advanced workshop in China here.

The workshop docs are available here.

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