Proposal to Remove Constraint on Using Physical 5 MHz Bandwidth for SFH
Document Number: IEEE C80216m-09/0826
Date Submitted: 2009-4-24
Source:
Yi Hsuan and Hujun Yin Email: {yi.hsuan@intel.com, hujun.yin@intel.com}
Intel Corporation
Venue:
IEEE Session #61, Cairo, Egypt.
Re: TGm SDD section 11.7.2.2.5
Base Contribution:
N/A
Purpose:
For TGm discussion and adoption of 802.16m SDD text.
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5 MHz Physical Bandwidth for SFH
•
Pros:
–
–
MS doesn’t need to know the system bandwidth information before
decoding SFH.
•
PA-Preamble carries bandwidth information so MS will know
system bandwidth before decoding SFH.
•
If bandwidth information is not acquired from PA-Preamble, SAPreamble cannot be decoded correctly either and SFH cannot be
decoded without SA-Preamble.
MS may use PA-Preamble to improve the channel estimation quality.
•
–
Our study shows that PA-Preamble helps in noise limited case.
In interference limited case it actually hurts SFH performance
because PA-Preamble is transmitted in the reuse 1 fashion and
PA-preamble based channel estimates are worse than pilot
based channel estimates.
Bandwidth outside the 5 MHz physical band can be further partitioned
into more frequency partitions.
5 MHz Physical Bandwidth for SFH
•
Cons:
–
It creates a special case for outer permutation. The 5 Mhz band needs
to be a separate frequency partition, which is composed of the central
5 MHz PRUs. The current permutation design does not support such
frequency partition.
–
To allocate remaining resource in the 5 MHz physical band, AMAP
may not fit into the remaining resource, making the remaining
resource difficult to use.
5 MHz Logical Bandwidth
•
Pros:
–
No frequency partition for SFH is needed. The entire system band can
be in one frequency partition.
–
There is no need to create a special permutation rule. Same
permutation design can be used.
Conclusion
•
Most advantages of using 5 MHz physical bandwidth do not exist any more
because of preamble design decisions.
•
5 MHz physical bandwidth increases complexity of the standard and
implementation.
•
We suggest to remove SDD text regarding using 5 MHz physical bandwidth
for SFH.
Proposed SDD Text Change
In section 11.7.2.2.5, replace
“The P-SFH and S-SFH are transmitted in a predefined frequency partition and
PRUs of the frequency partition used for P-SFH and S-SFH transmission are
selected within 5MHz of physical bandwidth.”
with
“The P-SFH and S-SFH are transmitted in a predefined frequency partition.”