doc.: ieee 802.11-05/0629r1 submission july 2005 bin wang, zte corporationslide 1 ess load balancing...
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doc.: IEEE /0629r1 Submission July 2005 Bin Wang, ZTE CorporationSlide 3 Agenda Introduction Load balancing illustration Current Load balancing in ESS Proposed textTRANSCRIPT
July 2005
Bin Wang, ZTE Corporation
Slide 1
doc.: IEEE 802.11-05/0629r1
Submission
ESS Load Balancing Requirements
Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.
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Date:2005-07-01
Name Company Address Phone email Bin Wang. ZTE Corporation Electronic West Road 3#,
Electronic Industry Zone, Xi’an, P.R.China
+86-29-88723141
Wang.binxa @zte.com.cn
Feng Li ZTE Corporation Electronic West Road 3#, Electronic Industry Zone, Xi’an, P.R.China
+86-29-88723130
Jie Li ZTE Corporation Electronic West Road 3#, Electronic Industry Zone, Xi’an, P.R.China
+86-29-88723148
Authors:
July 2005
Bin Wang, ZTE Corporation
Slide 2
doc.: IEEE 802.11-05/0629r1
Submission
Abstract
This document suggests ESS load balancing requirements for Wireless Network Managements.
July 2005
Bin Wang, ZTE Corporation
Slide 3
doc.: IEEE 802.11-05/0629r1
Submission
Agenda
• Introduction• Load balancing illustration• 802.11 Current• Load balancing in ESS• Proposed text
July 2005
Bin Wang, ZTE Corporation
Slide 4
doc.: IEEE 802.11-05/0629r1
Submission
Introduction• The meaning of load balancing:
– The traffic in ESS maintain even distribution during it’s life, varies smoothly.
– It is reasonable to satisfy high QoS requirement Applications that some STAs with low-level QoS requirements will be handed over to another AP, release their resources for the high QoS application.
• The necessity of load balancing:– The utilization of the ESS’s resources will be more evenly and
effectively, could decrease drastic wave and boosting of traffic. – The characteristics of ESS: BSSs live in harmony with each
other to form a ESS, and work together to supply services for STAs in the ESS.
– To guarantee the continuity of the Application which has QoS requirements.
– To prevent the happening of AP’s congestion and choke.
July 2005
Bin Wang, ZTE Corporation
Slide 5
doc.: IEEE 802.11-05/0629r1
Submission
Unbalanced Wireless Network
July 2005
Bin Wang, ZTE Corporation
Slide 6
doc.: IEEE 802.11-05/0629r1
Submission
AP Load Balancing
July 2005
Bin Wang, ZTE Corporation
Slide 7
doc.: IEEE 802.11-05/0629r1
Submission
802.11 Current • The APs in ESS manage their own load status respectively and
independently, and the distribution of load burden among APs just according to RSSI.
• STA based hand over: After STA decide to handover, it break it’s current connection and then subscribe JOIN request to it’s favorite target;
• As current hand over is a new process of authentication and JOIN, it is in all probability to happen that STA frequently checking out from a AP and checking in back to the same one, which degrades the performance of ESS tremendously.
• Handover caused by load balancing is a “two-edged sword”. It could release the burden of AP or break the application of STA. So the action must be controlled and restricted.
• Advantages:– STA knows exactly the occasion of hand over.– STA knows exactly the strength of signals in around.
• Disadvantages:– No communication and correspond among BSSs.– The information STA can acquire is insufficient to make correct decision.– Huge differences between STAs from different venders.– Uncontrolled handover.– Heavy bss will retain their chaos, while the lighter couldn’t be a partaker.
July 2005
Bin Wang, ZTE Corporation
Slide 8
doc.: IEEE 802.11-05/0629r1
Submission
Load balancing in ESS
• When unbalancing happening, two methods can the network be operate:– Load limitation: when new STA JOIN, check load
status and reject.– Let some STAs who has adequate condition to
handover to light APs. • An AP has more confederates to
accomplish one task.• Solve the same problem with more
sufficient resources.
July 2005
Bin Wang, ZTE Corporation
Slide 9
doc.: IEEE 802.11-05/0629r1
Submission
AP based or AP-STA collaborated load balancing
• ESS has the inherent privilege to gather global load balancing information.
• Could make use of both the network condition and the client status.
• Could make the decision more accurate.• Could make the command or recommend
generated by load balancing policy more meaningful.
• Diminish the “bad” handover or “regret” handover.
July 2005
Bin Wang, ZTE Corporation
Slide 10
doc.: IEEE 802.11-05/0629r1
Submission
Proposed text
• TGv should support ESS Load balancing to improve network performance and enlarge the network tolerance.
• AP based or AP-STA collaborated load balancing policy will be reasonable.
July 2005
Bin Wang, ZTE Corporation
Slide 11
doc.: IEEE 802.11-05/0629r1
Submission
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