Re: [STDS-802-16] [802.16n][DC] Discussion on definition of HR-MS DC and Forwarding to Network
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.
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.
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.
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