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Re: [STDS-802-16-MOBILE] [Handoff] Things to clarify and suggestions.

Dear HO ad hoc group:

 

Yes, there could be lots of misunderstandings and lacks of understanding what we defined terminology and the taxonomy of HO that we will treat in this month. I hope this email may clarify all even though it’s almost impossible.

 

In this email, I would answer Ronny’s questions one by one based upon my understandings.

 

Q1. The base assumption of a single BTS is that a BTS covers only one sector and each sector may have a different frequency.

Obviously, the table shows a different story on it. It is due to that the base assumption is too specific to cover all network deployment scenarios. Hence, although we take the base assumption, we might need more complex network architecture, which reduces the HO delays if appropriately designed. In this case, you might regard the base assumption as an extension to multi-sectored BTS.

 

Q2. Just the BTS don’t know which FA the neighboring BTS have.

 

Q3. ”Basic “ scenarios cover up to level 2 backbone communications, while “advanced” supports up to level 3 communications.

 

Q4. Again, the same principle. The taxonomy provides the extended scope of the HO scenarios. This means some network may be deployed with frequency reuse 1.

 

Q5. I think this part needs further discussion within the ad hoc group, too.

 

Q6. Again, the same principle. This takes place only when the frequency reuse is 1.

 

Q7. MBS doesn’t have any issues related to HO. Check again, please.

 

I hope this helps the folks of the HO ad hoc group.

 

Best regards,

 

Jung Won Kim/Ph.D

Yong Chang/Ph.D

 

Samsung Electronics

 

----- Original Message -----
From: ronnykim
Sent: Tuesday, June 01, 2004 8:02 AM
Subject: [Handoff] Things to clarify and suggestions.

Dear all

 

Regarding the base documents, I have suggestions and things to clarify.

 

I think AAS HO should be considered in 802.16e. Thus, I have added one more scenario and assumption on the list (marked in red).

I have suggested 5 possible handover scenarios with IP change consideration. I want to hear your opinion on this.

(I have uploaded "C802.16e-04_105_0601" on the FTP server http://upload.wirelessman.org in handoff ad hoc directory)

 

I have several things to clarify.

1. Does minimal assumption 1 and 2 "HO occurs between single sector BTS and Each sector is at a different frequency" mean that one BS only can have one sector?

   If so, this doesn't comply with the Assumption of Intra BTS HO with multiple sectors on the table. This assumption seems to me that either one BTS has more than one sector or more than one FA.

 

2. Does minimal assumption 3 "FA is unknown" mean that we will only consider 1 FA case or we have to consider all possible cases?

 

3. Please someone clarify what are the differences between Basic and Advanced?

 

4. Which case does Scenario name "Basic-Same-freq" and assumption "HO between sectors at the same frequency" represent?

   It seems to me this doesn't comply with the minimal assumption 2 "Each sector is at a different frequency".

 

5. Can basic/Advanced-MIMO be discussed without a consideration of different technologies?

 

6. If two base stations use different frequencies, how soft handover is possible?

 

7. Is MBS issue out of scope of handoff Ad hoc, even though MBS is related to the handoff?

 

I think we need to unify the terminology on the base document, e.g. use BS instead of BTS.

 

 

Regards,

 

Ronny(Yong-Ho) Kim

LG Electronics