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Hi, Eldad and all, Thank you for your clarification. I agree with you. Best Regards, Xin Zhang From: Zeira, Eldad [mailto:Eldad.Zeira@INTERDIGITAL.COM] Hi Xin, All In SRD there is a requirement for the HR-Network to support local forwarding via HR-RS or HR-BS. An HR-RS or HR-BS is primarily an 802.16 RS / ARS or BS / ABS that has been amended by 802.16n and has all the functionality of its baseline. Local forwarding is therefore an added capability, not a simplifying one. Signaling to establish direct forwarding should in my opinion go through BS (and backhaul, if exists) to allow for billing, load control, etc. Eldad Office +1 631 622 4134 Mobile +1 631 428 4052 Based in NY area From: Shyy, DJ [mailto:djshyy@MITRE.ORG] Xin: I understand the benefits of your proposal. However, if the signaling for setting up the local forwarding communication goes to a relay only (without going to the BS), is not the relay itself becoming another BS? In your proposal, would the relay need to have its own backhaul to communicate with ASN? From: ZHANG Xin [mailto:zhangxin@NICT.COM.SG] Dear Shoukang, DJ and all, Thank you for your responses and questions. I’d like to share my thought. In my opinion, forwarding is a simplified relay. The forwarding device listens to its superordinate station. Hence, the signalling for local forwarding establishment is required from BS. However, relaying is a more powerful procedure. If the relay is empowered with scheduling functionality in 16n, any MS that is in RS mode or RS can schedule its own relay, hence no signalling for establishment is required from BS. In this way, the workload of BS can be reduced. Do you agree? Best Regards, Xin Zhang From: Zheng Shoukang [mailto:skzheng@I2R.A-STAR.EDU.SG] Hi All: I list out some questions as follows: (1) Do we have any other definition for local forwarding? (2) Is signalling for local forwarding establishment required through BS? I would like to discuss on this. a. If BS is not required to take control of the signalling procedure, it is not necessary ? b. If BS is required to take control of the signalling procedure, it is necessary ? c. If BS is participating without taking the control, it is an option ? (3) Local forwarding for relay is that it allows mobiles to communicate with each other via relay(s) without going through the BS (by Shyy, DJ) a. As BS may require a copy of the data, it is an option to go through the BS, i.e. Relay sends one copy of data to BS. (4) Handover issues a. The case when one of the two communicating MS changes to be under the control of the Relay that can perform local forwarding b. The case when one of the two communicating MS changes to be out of the control of the Relay that can perform local forwarding Please comment. Regards, Shoukang From: Shyy, DJ [mailto:djshyy@mitre.org] Hi All: My understanding of local forwarding for relay is that it allows mobiles to communicate with each other via relay(s) without going through the BS. However, the signaling to establish local forwarding communication still needs to go through the BS. The subsequent data transfer does not need to go through the BS. From: Zheng Shoukang [mailto:skzheng@I2R.A-STAR.EDU.SG] Hi Zhang Xin, Regarding to local forwarding, I suggest we should define clearly. In my opinion, the local forwarding is defined as the receiving and forwarding by relay station (RS) for two communicating mobile stations (HR-MSs) that are under its own control, without going through the backhaul. Regards, Shoukang From: ZHANG Xin [mailto:zhangxin@NICT.COM.SG] Dear 802.16n participants, Hearing no response from the first kick-off email, may I call for questions or comments regarding the listed contributions from the audience floor? Thank you very much! Best Regards, Xin Zhang From: ZHANG Xin [mailto:zhangxin@NICT.COM.SG] Dear 802.16n participants, I would like to initiate an email discussion on relay operation and forwarding. According to the agenda in our last teleconference (C802.16n-rg-11/0044r1), document 32r1, 55r1, 38, 24r2, and 37 belongs to these categories. The following topics are addressed: - Local source and sink at HR-RS (55r1) - Alternative connection (38) - Relay Mechanism (32r1) o BS-BS communication via relay support o MS-MS communication via MS in relay mode - Local Forwarding (24r1) o RS-initiated local forwarding o Handover - Enhanced Local Forwarding for Multicast Service (37) I think there are not too many conflicts among these contributions, I would like to suggest to consolidate them into sessions of Relay Operation and Local Forwarding. What are you opinions? Any comments are greatly appreciated. Thank you! Best Regards, Xin Zhang, PhD NICT |