Re: [STDS-802-16] ??: [STDS-802-16] [MMR-AH-UM] Coope rative relaying addition to Section 5.3 - " Types of Routes" in C80216j%2d06_UMAHtemp_r 2.doc.
Dear Matty and Gang:
I believe we discussed this issue during the last ad-hoc meeting and was agreed to update the topology diagram to include this case. I believe David Steer from Nortel took the action to update the diagram.
Regards,
Peiying
-----Original Message-----
From: CTO Shen Gang [mailto:Gang.A.Shen@ALCATEL-SBELL.COM.CN]
Sent: Sunday, June 04, 2006 10:17 PM
To: STDS-802-16@listserv.ieee.org
Subject: [STDS-802-16] ??: [STDS-802-16] [MMR-AH-UM] Coope rative relaying addition to Section 5.3 - " Types of Routes" in C80216j%2d06_UMAHtemp_r 2.doc.
Dear Matty and all,
I agree Matty’s suggestion to add cooperative relaying to the discussion. In the cooperative relay, copies of the same data are retransmitted from multiple RSs simultaneously for diversity gain, or different packets or different parts of the same packet are relayed from several RSs simultaneously for multiplexing gain. RS deployment gives some benefits to cooperative gain. One of implementation method of cooperative relay may be macroscopic MIMO. Synchronization among RSs are one of key challenges in RS cooperation.
Best Regards,
Gang Shen
-----原始邮件-----
发件人: Matty Levanda [mailto:Mattyl@WINETWORKS.COM]
发送时间: 2006年6月4日 17:04
收件人: STDS-802-16@listserv.ieee.org
主题: [STDS-802-16] [MMR-AH-UM] Cooperative relaying addition to Section 5.3 - "Types of Routes" in C80216j%2d06_UMAHtemp_r2.doc.
Dear all,
I suggest adding cooperative relaying to the rout type discussion in the Usage Model document. That is, when more than one RS are transmitting the same data to a MS. The MS may be aware of this (they appear like more than one BS antenna to the MS, much like Tx antenna diversity used at the BS) or unaware (if the RS send the same waveforms so they appear like one BS antenna to the MS). Cooperative relaying is different than "redundant routes" and has the resilience built into it.
It is expected that in areas with coverage problems due to many shadows (e.g., in and between buildings) RS deployment needs to be dense and as a result coverage areas will greatly overlap (in the unshadowed areas). This high percentage of fringed areas decreases the capacity and throughput of the system. The way to overcome this is by making groups of relays to cooperate during all or part of the downlink portion of the frame.
Matty