Hi David,
Thanks for the link to the 3GPP2 web site.
In Table 2.1.1.1.2-3 of C.S2002-C v1.0, the CDMA channel numbers for Band Class
1 (PCS band in the US) and spreading rate 1 are listed. Using Block B (15 MHz) as an
example, it is shown that the CDMA channel numbers between 425 and 675 are
always valid, whereas the ones between 400 and 424, and those between 676 and
699 are marked conditionally valid. It is true that there are 11 channels that
are always valid - also listed in Table 2.1.1.1.2-5 as "preferred" channel
numbers. However, the standard didn't seem to exclude the option of deploying
12 channels within the block. Would it be possible to have a scenario in which
an operator owns both adjacent blocks. e.g., Blocks D and B, so that the
operator can decide to use channel number 400 in addition to the 11 preferred
channels? In this scenario, it would be possible to deploy 12 CDMA channels in
15 MHz bandwidth.
Best regards,
Anna.
-----Original Message-----
From:
owner-stds-80220-requirements@majordomo.ieee.org
[mailto:owner-stds-80220-requirements@majordomo.ieee.org] On Behalf Of Shively, David
Sent: Tuesday,
November 25, 2003 12:13 PM
To: stds-80220-requirements@ieee.org
Subject: RE:
stds-80220-requirements: Spectral Efficiency (4.1.2)
Thank you for providing
this information. You are correct that adjacent cdma2000 carriers may be
placed adjacent to one
another. This is exactly what I had said in my previous email
below.
At the edge of a 5 MHz
licensed frequency block, there is typically a guard band of 625 kHz. As
you
have noted, this is to
avoid interference to an operator in an adjacent frequency block. With a
guard band
of 625 kHz on each end of
a 5 MHz block, this leaves only 3.75 MHz of spectrum, e.g. this will allow
the deployment of 3
cdma2000 carriers where each carrier is 1.25 MHz.
In the case of a 15 MHz
licensed spectrum block, it is possible to deploy a total of 11 cdma2000
Additional details
can be found in: Physical Layer Standard for cdma2000 Spread Spectrum
Systems
Also, again as I had
indicated in my previous email, if an operator had a licensed allocation
of only
1.25 MHz then there is no
realistic way to deploy this type of system since the necessary guard bands
would fall out of this
block and onto the adjacent operators.
-----Original
Message-----
From: Lai-King Tee
[mailto:a.tee@samsung.com]
Sent: Tuesday,
November 25, 2003 2:03 PM
To: 'Joseph Cleveland'; 'Shively, David';
stds-80220-requirements@ieee.org
Subject: RE:
stds-80220-requirements: Spectral Efficiency (4.1.2)
Hello David,
Based on what I found
from the reference material*, the guard band is used in the CDMA (IS-95) system
when the adjacent frequency channel may have high power signal transmissions.
However, there is no need for guard bands between adjacent CDMA channels.
The reason that the first
CDMA 2000 channel is usually deployed further away from the edge of the
licensed band is probably to avoid high interference power from the adjacent
frequency channel that has been used for other high power wireless systems.
*Reference: "Jerry
D. Gibson, The Mobile Communications Handbook, Chapter 27, IEEE press, 1996.
Best regards,
Anna.
-----Original Message-----
From:
owner-stds-80220-requirements@majordomo.ieee.org
[mailto:owner-stds-80220-requirements@majordomo.ieee.org] On Behalf Of Joseph Cleveland
Sent: Tuesday,
November 25, 2003 8:53 AM
To: 'Shively, David';
'stds-80220-requirements@ieee.org'
Subject: RE:
stds-80220-requirements: Spectral Efficiency (4.1.2)
I
disagree with your analysis. For example, PCS D/E/F-Block (5
MHz) operators currently use carriers separated by 1.25 MHz with all
channels assigned. If an operator has a 15 MHz block (e.g.,
A/B/C-Block), the operator can use the entire spectrum with
carriers placed 1.25 MHz apart across the entire block - for a total
of 12 carriers, not 9. It is realistic to deploy a system with a chip rate
of 1.2288 Mcps in a 1.25 MHz bandwidth!
-----Original
Message-----
From:
owner-stds-80220-requirements@majordomo.ieee.org [mailto:owner-stds-80220-requirements@majordomo.ieee.org]
On Behalf Of Shively, David
Sent: Tuesday, November 25, 2003
10:00 AM
To:
'stds-80220-requirements@ieee.org'
Subject: RE:
stds-80220-requirements: Spectral Efficiency (4.1.2)
I'm
afraid I have to disagree and this is actually an example of the point I
have tried
In some
cases, yes, cdma2000 carriers can be placed directly adjacent to one another,
although
there is some degradation in overall capacity when this is done. However,
in
most
deployments the first cdma2000 channel that is used is 1.25 MHz away from the
edge of
the licensed band. This means that there is a guard band of approx.
625 kHz
between
the first cdma2000 carrier and the edge of a licensees spectrum allocation.
This
is why an operator can use 3 cdma2000 carriers in a 5 MHz block of
licensed spectrum
If an
operator had a license for only a 1.25 MHz block of spectrum, then I do not
think it would
realistic
to deploy a system with a chip rate of 1.2288 Mcps.
-----Original
Message-----
From: Joseph Cleveland
[mailto:JClevela@sta.samsung.com]
Sent: Tuesday, November 25, 2003
9:51 AM
To: 'Shively, David';
'stds-80220-requirements@ieee.org'
Subject: RE:
stds-80220-requirements: Spectral Efficiency (4.1.2)
I
believe that if you look at the spectrum allocation scheme and spectrum
emission mask for CDMA2000 you will find that 1.25 MHz does include the
guard bands. The CDMA2000 channel spacing is 1.25 MHz.
-----Original
Message-----
From:
owner-stds-80220-requirements@majordomo.ieee.org
[mailto:owner-stds-80220-requirements@majordomo.ieee.org] On Behalf Of Shively, David
Sent: Monday, November 17, 2003
3:06 PM
To:
stds-80220-requirements@ieee.org
Subject: RE:
stds-80220-requirements: Spectral Efficiency (4.1.2)
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
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