Regards,
Dan Gal
Lucent Technologies O
----------------------------------------------------------------------------------
Current text: "The 802.20
system must be designed to provide
ubiquitous broadband wireless access in a cellular architecture."
New text: "The 802.20
system shall be
designed to provide ubiquitous broadband wireless access in a cellular
architecture and be capable
of reusing existing infrastructure."
Rationale: align with the requirements
of the PAR (see "Cell Sizes" item in the table in section 1.3)
-------------------
Section 4.1.12 - Antenna
Diversity
Proposal: delete the
section.
Rationale: Redundant requirement.
Section 4.1.11 covers it all.
------------------
Section 4.1.2 - Spectral
Efficiency
Current text: "
Editors Note: Michael Youssefmir to
supply definition of expected aggregate throughput for Appendix B.
Sustained spectral efficiency is computed in a loaded multi-cellular network setting. It is defined
as the ratio of the expected aggregate throughput (taking out
all PHY/MAC overhead) to all
users in an interior cell divided by the system bandwidth. The
sustained spectral efficiency
calculation shall assume that users are distributed uniformly
throughout the network and shall
include a specification of the minimum expected data
rate/user.
[Downlink > 2 bps/Hz/sector]
[Uplink >1 bps/Hz/sector]
1. New
text:
Sustained spectral
efficiency is computed in a loaded multi-cellular,
three-sector per cell, network setting. It is
defined
as the ratio of the expected aggregate throughput (taking out
all PHY/MAC overhead) to all
users in a cell divided by
the total
spectrum deployed in that
cell. The sustained spectral efficiency
calculation shall assume that users are distributed uniformly
throughout the network and shall
include a specification of the minimum expected data
rate/user.
Given the above definition, the
minimum spectral efficiency requirements shall be:
- Downlink: greater
than 6 bps/Hz/cell
- Uplink: greater
than 3
bps/Hz/cell
Rationale: The change reflects recent comments and requests to change the definition to bps/Hz/cell and
the need to baseline
all proposals on a three-sector cell configuration. Thus, the
previous figures were factored by 3.
2.
Comment on UL/DL symmetry: The PAR provides just one number ("
>1b/s/Hz/cell") - why then aren't the UL and DL figures the
same?
-----------------------
Section 4.1.4 - Support for Different Block
Assignments
Add the
following text at the end of section: "Proposals shall support all block assignments of a given
frequency arrangement (FDD, TDD)"
Rationale:
add clarity to the current text.
-------------------------------------------------------------------------------------------------------------------------------------------