Re: [STDS-802-16] Question on unsolicited MOB

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Dear Lepidus,

Glad to receive your mail.

I does not aware the difference between my understanding and Geunhwi’s comment. If a MS supports the capability of FBSS/MDHO, it shall perform the autonomous neighbor cell scanning all the time without the instruction by BS. Therefore, when the BS send the MOB_SCN-RSP to MS with Scan duration set as zero, this message is to instruct the MS to “report” the scanning results. Then MS will report the results based on its signal quality database.

I suppose BS can know if the MS supports FBSS/MDHO through the ‘Handover supported’ field in REG-REQ/RSP message, and its detail is available in 11.7.13.5 in Cor2/D2. Once the BS know the MS will support the FBSS/MDHO, it’s reasonable to assume the MS will perform the autonomous neighbor cell scanning.

The aforementioned comments are my understanding, any correction or amendment will be much appreciated. Thank you very much.

Best Regards,

I-Kang

=================================================

I-Kang Fu IKFu@itri.org.tw

New Mobile Access Tech. Dept.

Information & Communications Research Labs

Industrial Technology Research Institute (ITRI), Taiwan

=================================================

From: Lepidus_Chang@mtk.com.tw [mailto:Lepidus_Chang@mtk.com.tw]
Sent: Sunday, March 04, 2007 2:50 PM
To: I-Kang Fu
Cc: STDS-802-16@listserv.ieee.org
Subject: Re: [STDS-802-16] Question on unsolicited MOB_SCN-RSP message. (16e-2005)

Hello I-Kang,

Thanks for the reply.

In case the "MS autonomous neighbor cell scanning" is not instructed by MOB_SCN-RSP (including both unsolicited or not), the
expected action for MS which receives unsolicited MOB_SCN-RSP message becomes undefined in the current specifications.

Per the comments from Geunhw Lim in 80216-07_013r2.cmt (comment #25),
"Without the allocated scanning duration, MS could report the measurement from autonomous scanning. The current spec allows that a BS could deny the allocation of scanning interval but request the measurement result which MS has from background scanning, through a MOB_SCN-RSP message."
In this comment, the unsolicited MOB_SCN_RSP message would expect MS to perform autonomous scanning. As there is only one
section describing "MS autonomous neighboring cell scanning" throughout the current specifications, I would not think Geunhw's understanding
is the same as yours on "MS autonomous neighbor cell scanning is not instructed by MOB_SCN-RSP".

On your reply item 3, "Therefore, I think the MS which does not perform FBSS/MDHO may still be instructed to report its scanning results by BS."
In case the expected action for MS which receives unsolicited MOB_SCN-RSP message is not the "MS autonomous neighbor cell scanning" defined
in Section 8.4.13.1.3, the expected action for MS is undefined. In case the expected action is defined in Section 8.4.13.1.3, it violates the requirement that
autonomous scanning is restricted to MS which supports FBSS/MDHO.

As I find this issue unclear on both ways, I would love to learn your opinions on this issue. Any other comments are also appreciated.

Best regards,
Lepidus.

I-Kang Fu <IKFu@ITRI.ORG.TW>

2007/03/04 12:40 PM
請回信給 I-Kang Fu

收件人： STDS-802-16@listserv.ieee.org

副本抄送：
主旨： Re: [STDS-802-16] Question on unsolicited MOB_SCN-RSP message. (16e-2005)

----- 訊息來自 "I-Kang Fu" <IKFu@itri.org.tw> (位於 Sun, 4 Mar 2007 12:40:15 +0800) -----

寄件人:	<STDS-802-16@LISTSERV.IEEE.ORG>
主旨:	Re: [STDS-802-16] Question on unsolicited MOB_SCN-RSP message. (16e-2005)

## Due to some format mismatch in my last mail, I re-send this again. Sorry for your inconvenience. ##

Dear Lepidus,

I would like to share my understanding for your reference. Any correction or amendment on my replies are welcome and appreciated.

1. The “MS autonomous neighbor cell scanning” is not instructed by MOB_SCN-RSP, it’s different from the normal scanning procedure defined in 6.3.22.1.2. According to section 8.4.13.1.3 in IEEE Std 802.16 Cor2/D2, the MS shall autonomously scan the preamble transmitted by neighboring cells if it supports the capability of FBSS/MDHO. So that MS can continuously maintain the signal quality database to decide whether the neighbor BSs should be added into the diversity set.

2. Yes, the MS autonomous neighbor cell scanning shall be performed only when the FBSS/MDHO is supported.

3. According to section 6.3.22.1.2, it says that the serving BS may also send MOB_SCN-RSP message unsolicited. In this case, BS will set Scan duration as zero to trigger MS to report scanning result. Therefore, I think the MS which does not perform FBSS/MDHO may still be instructed to report its scanning results by BS.

4. Yes, I think so. I think scanning the preamble transmitted in different carrier frequency is not within the scope of autonomous neighbor cell scanning. For this case, the normal scanning procedure should be used.

Best Regards,

I-Kang
=================================================
I-Kang Fu IKFu@itri.org.tw
New Mobile Access Tech. Dept.
Information & Communications Research Labs
Industrial Technology Research Institute (ITRI), Taiwan
=================================================

From: Chao_Ming Chang [mailto:Lepidus_Chang@MTK.COM.TW]
Sent: Saturday, March 03, 2007 2:55 PM
To: STDS-802-16@LISTSERV.IEEE.ORG
Subject: [STDS-802-16] Question on unsolicited MOB_SCN-RSP message. (16e-2005)

Hello all,

Regarding the MOB_SCN-RSP message defined in IEEE 802.16e-2005 and revised in Cor2/D2
(page 144 of P80216_Cor2_D2.pdf), the Scan duration is set to be zero. In this case,

1. Does the MS receiving MOB_SCN-RSP have to perform "MS autonomous neighbor cell scanning" defined
in Section 8.4.13.1.3?

2. In case the answer to the first question is positive, does it applicable only when the MS supports FBSS/MDHO?
because MS is requested to support autonomous neighbor cell scanning when it supports FBSS/MDHO as specified in
Section 8.4.13.1.3 (page 647 of 16e-2005).

3. Would you think it is better to precisely restrict that unsolicited MOB_SCN-RSP message is only applicable to MS which
supports FBSS/MDHO in Section 6.3.22.1.2 "MS scanning of neighbor BSs" which defines the unsolicited MOB_SCN-RSP
message on page 144 of Cor2/D2?

4. At last, in Section 8.4.13.1.3, it said that "For autonomous scanning procedure, the MS shall perform neighboring cell scanning
via preamble detection for neighbor cells in the same carrier frequency." Is it the same carrier frequency with the serving BS?

Any comments or replies on the questions are highly appreciated. Thanks.

Best regards,
Lepidus.

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