Now a fundamental
property of the grant per SS scheme employed in 802.16 is that there is no
guarantee that the SS uses the bandwidth as the BS intended it. This means that
the perceptions at BS and SS can be different and situations occur where there
are mismatches between the state information at the BS and the SS. Again let me
stress that this is a design feature and not a bug in the protocol. Each vendor
should design their scheduling algorithms in the SS and the BS, respectively,
to recover from these mismatch situations.
-----Original Message-----
From: jungje.son@samsung.com
[mailto:jungje.son@samsung.com]
Sent: 16 September, 2004 14:29
To: Eklund Carl
(Nokia-NRC/Helsinki); STDS-802-16@listserv.ieee.org
Subject: RE: [STDS-802-16]
Incremental type BW request Clarification
Carl,
Thanks for your response.
Then do you think ¡°perceived
bandwidth needs of a connection¡± means granted bandwidth for
the connection
Otherwise do you think it
may vary case by case?
My point was to clarify the
rule of using incremental BW request message by SS and BS.
In my thought, BS should
recognize the same size of requested bandwidth as requested.
Therefore, SS should know
how much is the ¡°perceived bandwidth¡±.
For example,
When SS have requested 100
for connection A and was granted 70.
And SS wants to request 120
(90 for new data and 30 for last unsent data).
My question is how SS
denotes 120 at incremental BW request message and BS can recognize 120 as
requested by incremental BW request message.
BR
Jung Je Son, PH.D.
Senior Engineer
Global Standards Strategy Team
Telecommunication
R&D Center
SAMSUNG ELECTRONICS CO., LTD
Tel : +82-31-279-5098
Mobile :
+82-16-9530-5098
--------------------------------------------------
What Do You Want To Be?
Plan, Do and See?
--------------------------------------------------
From: owner-stds-802-16@listserv.ieee.org [mailto:owner-stds-802-16@listserv.ieee.org]
On Behalf Of carl.eklund@NOKIA.COM
Sent: Thursday, September 16, 2004
7:45 PM
To: STDS-802-16@listserv.ieee.org
Subject: Re: [STDS-802-16]
Incremental type BW request Clarification
in my opinion there is no
error in the sentence you quote in your mail and therefore it shouldn't be a
corrigenda item. The 'perceived bandwidth needs of a connection' is not
equivalent with the amount requested in the previous (aggregate) BW
request message as the BS may choose to grant the the requested capacity
in several chunks. Also as the scheduling algorithm in the BS
unfortunately suffers from non-zero latency the perception of the BS can
be different from the amount requested in the previous BW request message.
-----Original Message-----
From:
owner-stds-802-16@listserv.ieee.org
[mailto:owner-stds-802-16@listserv.ieee.org]On
Behalf Of jungje.son@SAMSUNG.COM
Sent: 16 September, 2004 11:06
To: STDS-802-16@listserv.ieee.org
Subject: [STDS-802-16] Incremental
type BW request Clarification
In current 802.16 2004 spec,
page 144 line 50 says
¡°When the BS receives an incremental Bandwidth Request, it shall
add the quantity of bandwidth requested to its current perception of the
bandwidth needs of the connection¡±.
How should I understand ¡°perception of the
bandwidth needs of the connection¡± ?
It is the same value with
requested bandwidth by last BW request message of the connection from MSS?
Furthermore, such a thing is
a corrigenda item?
Thanks,
Jung Je Son, PH.D.
Senior Engineer
Global Standards Strategy Team
Telecommunication
R&D Center
SAMSUNG ELECTRONICS CO., LTD
Tel : +82-31-279-5098
Mobile :
+82-16-9530-5098
--------------------------------------------------
What Do You Want To Be?
Plan, Do and See?
--------------------------------------------------