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Joseph,
I
really have no idea what you are debating.
What I had said was that an operator that has a
licensed block of 5 MHz can only deploy
3 cdma2000 carriers (not
4).
If you assume that the operator has a license for
a 15 MHz block, then it is possible to
deploy 11 carriers (not 12).
As Sprint had noted in the Albuquerque meeting, many
frequency allocations around the world
and in the US are based on a licensed block size
of 5 MHz. This includes the WCS spectrum that
you have mentioned. Thus, if an operator has only
a 5 MHz block, then a realistic deployment
scenario must include
adequate guard bands within this block.
David Shively
-----Original Message-----
From:
Joseph Cleveland [mailto:JClevela@sta.samsung.com]
Sent: Wednesday,
November 26, 2003 10:38 AM
To: 'Shively, David'; Anna Tee;
'stds-80220-requirements@ieee.org'
Subject: RE:
stds-80220-requirements: Spectral Efficiency
(4.1.2)
Hi
All,
So I
guess it appears that it is possible to put 4 CDMA carriers in 5 MHz of
spectrum in a 15 MHz block or in a combined 15 MHz+5 MHz block. Then,
what are we debating?
Has
anyone examined the spectrum allocation for the WCS
services?
- WCS should be licensed initially as
two 10 MHz channel blocks (with 5 MHz of this spectrum from the lower band
paired with 5 MHz from the upper band) plus two 5 MHz blocks (those
immediately adjacent to the satellite DARS spectrum). [page 23, FCC 97-05] The specific channel blocks are as
follows [page 24, FCC 97-05]:
·
Channel Block A
à 2305 - 2310 and 2350 - 2355 MHz
·
Channel Block B
à 2310 - 2315 and 2355 - 2360 MHz
·
Channel Block C
à 2315 - 2320 MHz
·
Channel Block D
à 2345 - 2350 MHz
- For
out-of-band emissions, the requirement will be that all emissions from
WCS fixed transmitters be attenuated below the transmitter power (p) by at
least 80 + 10log(p) dB and that all emissions from WCS mobile transmitters
be attenuated at least 110 + 10log(p) dB within the 2320 - 2345 MHz
band. This level of attenuation is required in order to adequately
protect satellite DARS reception from WCS transmissions. [pages 70 - 71, FCC
97-05]
Note
that guard bands are not specified but out-of-band emission requirements are
specified. The needed "guard band" now becomes an implementation
issue.
Joseph Cleveland
Hi
Anna,
Since 802.20 is intended to be deployed in licensed
bands, the guard band requirements must be understood
and accounted for in the design of the
radio. As I have said, if an operator has only a 5 MHz block,
then it is
possible to deploy only 3 cdma2000 carriers (not 4). If
an operator has a 15 MHz licensed block, then it is
possible
to
deploy only 11 carriers (not 12). As you have
noted, if an operator has licenses for two (or more) adjacent
blocks
(such as B and D), then it would be possible
to deploy a total of only 15 carriers in a total licensed block of 20
MHz
(
15 MHz B-block + 5 MHz D block = 20 MHz). Under the Part 24
rules for PCS, guard bands are not required
between licensed blocks if both blocks are licensed
to the same operator.
Best regards,
David Shively
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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