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Regarding these definitions, it should be clearly understood whether
or not guard bands are accounted for in the calculation of spectral
efficiency. For UMTS (W-CDMA), the channel is usually quoted as being
5 MHz wide. In this case the guard bands have been included. However,
for cdma2000 1X (and IS-95) the channel is usually quoted as being
1.25 MHz wide which does not include the necessary guard bands.
I propose the following:
Network Wide Bandwidth: The network wide bandwidth is the total spectrum in
use by the unique carriers deployed in the network, including any
required guard bands.
Best regards,
David Shively
-----------------------------------------------------------
Dr. David Shively
Cingular Wireless
5565 Glenridge Connector, Mail Stop 950
Atlanta, GA 30342
Phone: 404 236 5909
Mobile: 404 285 5731
FAX: 404 236 5949
email: david.shively@cingular.com
pager: dshively@imcingular.com
-----Original Message-----
From: Humbert, John J [NTWK SVCS] [mailto:JHumbe01@sprintspectrum.com]
Sent: Monday, November 17, 2003 12:08 PM
To: stds-80220-requirements@ieee.org
Cc: mike@arraycomm.com
Subject: stds-80220-requirements: Spectral Efficiency (4.1.2)
Below is the latest version of the text that was developed at the Plenary in Albuquerque along with a list of the open issues for this section.
* 4.1.2 System Spectral Efficiency (b/s/Hz/sector)
* The system spectral efficiency of the 802.20 air interface shall be quoted for the case of a three sector baseline configuration [Footnote 1]. It shall be computed in a loaded multi-cellular network setting, which shall be simulated based on the methodology established by the 802.20 evaluation criteria group. It shall consider among other factors a minimum expected data rate/user and/or other fairness criteria, and percentage of throughput due to duplicated information flow. The values shall be quoted on a b/s/Hz/sector basis. The system spectral efficiency of the 802.20 air interface shall be greater than X b/s/Hz/sector.
* Footnote 1: Since the base configuration is only required for the purpose of comparing system spectral efficiency, proposals may submit deployment models over and beyond the base configuration.
* Definition:
* System spectral efficiency - System spectral efficiency is defined as the ratio of the aggregate throughput (bits/sec) to all users in the system divided by the network wide bandwidth (Hz) and divided by the number of sectors in the system.
* Aggregate Throughput: Aggregate throughput is defined as the total throughput to all users in the system (user payload only).
* Network Wide Bandwidth:The network wide bandwidth is the total spectrum in use by the unique carriers deployed in the network.
* Open items
- Single value vs. multiple for uplink and downlink
- X bits/sec/Hz [note 1 b/s/Hz -or- downlink > 2 b/s/Hz/(cell or sector?) @ 3km/hr ;uplink > 1 b/s/Hz/(cell or sector?) @ 3 km/hr].
- Actual values of spectral efficiency at higher speeds
- TDD/FDD
John J. Humbert
6220 Sprint Parkway
Mailstop KSOPHD0504 - 5D276
Overland Park, KS 66251-6118
PCS (816) 210-9611