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.