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Hi Mingtuo, Haiguang Thanks for this discussion. I mostly agree with
Haiguang's opinion but have one question for clarification and several
suggestions. Eldad Office +1 631 622 4134 Mobile +1 631 428 4052 Based in NY area -----Original Message----- Dear Ming-Tuo and all, Thanks very much to Ming-Tuo bring this topic to the
group. It is very important to have a common understanding these issues. I try to reply the questions based on my understanding. Please see my answer inline. Regards. Haiguang -----Original Message----- From: Ming-Tuo ZHOU [mailto:mingtuo@nict.com.sg] Sent: Thu 4/21/2011 6:20 PM To: STDS-802-16@LISTSERV.IEEE.ORG Subject: [STDS-802-16] [802.16n][DC] Discussion on
definition of HR-MS DC and Forwarding to Network Dear 16n participants, I'd like to trigger discussion of definition of HR-MS
direct communication and HR-MS forwarding to network, since from many
discussions it seems there are some confusion regarding them. In my opinion, it
is necessary to have a clear common understanding of these two functions for
development of technical details in a more smooth way. Anyone is welcome to
bring his/her understanding of these two functions by replying this email. I
hope after several rounds of email discussion, we can achieve some consensus
regarding these two functions. The discussion may be started by answering follow
questions: 1. what is HR-MS direct communication (DC)? Haiguang: HR-MS direct communication means, the two
HR-MSs involved in the communication
are the producer and consumer of the data packets. That is, the source HR-MS
pass the data packet down from upper layer to MAC and the destination HR-MS
pass the packet to upper layer from MAC after receiving from the air.
Clarification: the producer and consumer here are from the view of MAC. It does
not mean the packet is originated from the source HR-MS and terminated at the
destination HR-MS. Eldad: suggest the following text (editorial cleanup, I think
it means the same) The two HR-MS that are in direct
communications with each other are the source and the sink of data. Packets are
passed from upper layers to MAC at the source and back to upper layers at the
sink HR-MS. 2. what is HR-MS forwarding to network (FTN)? Haiguang: HR-MS forwarding means the forwarding HR-MS either
forwards the data packet to
HR-BS or to the HR-MSs that access the network via the forwarding HR-MS.
The forwarded packet will not be passed to upper layer. Instead, it is
forwarded to
next hop at MAC layer. Eldad: again I agree with the
principle and suggest the following wording: An HR-MS
that forwards data to infrastructure node or to another forwarding HR-MS that
is attached to an infrastructure node (if multi-hop is supported) does so without
passing any data to or from higher layers. 3. what's difference between HR-MS DC, HR-MS FTN, and HR
relay/local forwarding? Haiguang: The differences are: *
For HR-MS DC, at the source HR-MS, the data packets are from upper layer and
are passed
to upper layer protocol at the destination HR-MS. *
For HR-MS FTN, the data packet is forwarded to next hop at MAC layer. The data
packets are
not handled by upper layer protocol. HR-MS who forwards data packet is still an
HR-MS. It
only has a very simple relay function and can only support very few nodes, one
or two.
From other HR-MSs' view, HR-MS performing the relay function is still an HR-MS.
HR relay is a kind of infrastructure
station designed for the purpose of relay. It is complex and like a BS. It is
designed to support many MS in network access. * Local forwarding means the
infrastructure station between MS and BS forwards data packets from downstream
HR-station to destination HR-MS without passing it to upstream infrastructure stations.
A general case is a HR-RS
forwards the data packets from one of its HR-MS (source) to another HR-MS which
is the destination. Eldad: - Not
sure what is the meaning of "From other HR-MSs' view, HR-MS performing the
relay function is still an HR-MS." - could you please clarify? - From
the SRD, an HR-RS is " A relay that
complies with the requirements for relays in this amendment". This
is an amendment to 802.16n or 2009, which means that an HR-RS is an RS or ARS as
amended by 802.16n. I don’t think we need to define it any further,
although we'll need to specify how to implement the requirements we have agreed
to in the SRD. If you have more questions that may help to understand
these two functions, please also bring them here. Finally, the following is expected to be made: [Consensus:
] Thank you very much. Best regards, Ming-Tuo Zhou 16n DC RG co-chair |