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RE: stds-80220-requirements: Proposed text for Section 4.1.2 Spectral Efficiency




Dan,

Yes, this proposal is including all sectors of a single cell-site in the "cell". The definition of cell in the appendix (see below) is not consistent with this and probably ought to be changed to reflect generally accept usage of the term.

Page 27:
· Cell - The term "cell" refers to one single-sector base station or to one sector of a base station deployed with multiple sectors.

Samir

-----Original Message-----
From: Dave James (OAK Global) [mailto:djames@oak-global.com]
Sent: Friday, October 17, 2003 12:43 AM
To: 'Gal, Dan (Dan)'; 'Kapoor Samir'; stds-80220-requirements@ieee.org
Cc: 'Michael Youssefmir (E-mail)'; 'Joanne Wilson (E-mail)'; 'Todd
Chauvin (E-mail)'
Subject: RE: stds-80220-requirements: Proposed text for Section 4.1.2
Spectral Efficiency


Dan, and Sami et al:
 
1   I support Sami et al's proposal.

2   Dan has a point, though, and I was going to raise this - but I cannot
right now access the terminology doc. (I need 802.20 connectivity, you see
...). Is it possible to supply that text in a brief e-mail ?

3   V small point: 3 words "The values of" seem redundant.
Thanks and BR, 
Dave James
OAK Global BV


-----Original Message-----
From: owner-stds-80220-requirements@majordomo.ieee.org
[mailto:owner-stds-80220-requirements@majordomo.ieee.org] On Behalf Of Gal,
Dan (Dan)
Sent: 16 October 2003 21:07
To: 'Kapoor Samir'; 'stds-80220-requirements@ieee.org'
Cc: 'Michael Youssefmir (E-mail)'; 'Joanne Wilson (E-mail)'; 'Todd Chauvin
(E-mail)'
Subject: RE: stds-80220-requirements: Proposed text for Section 4.1.2
Spectral Efficiency



Samir et al.

The definition of the term "cell" in the terminology section of the 802.20
System Requirements document is not consistent with the usage of the term in
your proposal where "cell" seems to include ALL the sectors of a single
cell-site. Please clarify.

Regards,
Dan

-----Original Message-----
From: Kapoor Samir [mailto:S.Kapoor@flarion.com]
Sent: Thursday, October 16, 2003 7:07 AM
To: 'stds-80220-requirements@ieee.org'
Cc: 'Michael Youssefmir (E-mail)'; 'Joanne Wilson (E-mail)'; 'Todd Chauvin
(E-mail)'
Subject: stds-80220-requirements: Proposed text for Section 4.1.2 Spectral
Efficiency



The following proposal and text is submitted on behalf of Samir Kapoor, Mike
Youssefmir, Joanne Wilson and Todd Chauvin. Thanks, Samir

Proposal:
For Section 4.1.2, change the sustained spectral efficiency measure from
b/s/Hz/sector to b/s/Hz/cell. For the purpose of evaluation, proposals
should be limited to at most three sectors to maintain consistency with
current deployment practices.

The values of the number of sectors and the number of antennas must be
clearly disclosed to allow for comparisons between various proposals.
Proposed minimum values are

downlink > 2 b/s/Hz/cell
uplink > 1 b/s/Hz/cell

The channel and traffic conditions under which these values are to be
attained are to be specified in the evaluation criterion.

Rationale:
Defining spectral efficiency on a per sector rather than a per cell basis
can lead to inconsistencies in the way different TDD and FDD air interfaces
achieve sectorization. For example, for a given number of cell site
antennas, this may penalize air interfaces that partition a cell into
multiple fixed sectors with fewer directional antennas per sector rather
than have one sector in the entire cell that uses all the antennas. The
measure b/s/Hz/cell measures the aggregate sustained bandwith in the
downlink and uplink obtained in the entire cell (also on the cell backhaul)
and allows different air interfaces to be compared.

New Proposed Text:

4.1.2	Spectral Efficiency (b/s/Hz/cell) 
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. For the
purpose of evaluation, proposals should be limited to at most three sectors
to maintain consistency with current deployment practices. The values of the
number of sectors and the number of antennas must be clearly disclosed to
allow for comparisons between various proposals. Proposed minimum values are

downlink > 2 b/s/Hz/cell
uplink > 1 b/s/Hz/cell

The channel and traffic conditions under which these values are to be
attained are to be specified in the evaluation criterion.