Coordinated AP for tightly coupled BS-AP interworking for Multi-RAT devices
IEEE 802.16 Presentation Submission Template (Rev. 9)
Document Number:
IEEE S802.16ppc-10/0066
Date Submitted:
2010-11-10
Source:
Youngsoo Yuk, Eunjong Lee, Heejeong Cho and Inuk Jung
youngsoo.yuk@lge.com
LG Electronics
Venue:
IEEE Session #70
Base Contribution:
IEEE C802.16ppc-10/0066
Purpose:
To be discussed by PPC
Notice:
This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It represents only the views of the
participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add,
amend or withdraw material contained herein.
Release:
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the
creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this
contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor
also acknowledges and accepts that this contribution may be made public by IEEE 802.16.
Patent Policy:
The contributor is familiar with the IEEE-SA Patent Policy and Procedures:
<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.
What is heterogeneous network?
 It means multiple networks (e.g., Wi-Fi, Wi-Bro, WCDMA and so on) with their
corresponding radio access technologies.
 By
•
•
•
using the interworking mechanisms, the following benefits can be provided.
Cost-efficient capacity enhancement
Seamless mobility
Ubiquitous service access
Necessity of coordination between the networks
 Limitations of the interworking without coordination
• High power consumption for detecting other network (e.g., WLAN AP)
• In-device interferences between networks (e.g., cellular and WLAN)
 Therefore, control connection for coordination is required.
Internet
(ISP)
 It has already been implemented in the
working document “study report on
hierarchical networks
(IEEE 802.16ppc-10/0008r1)”.
 However, there are no descriptions of
key features and requirements for the
coordination.
Control
Connection
IEEE 802.16x BS
IEEE 802.11 AP
IEEE 802.11 link
IEEE 802.16 link
Multi-RAT client
Figure 5 (a): Network offloading traffic for Multi-RAT client to 802.11 network
How is coordination done between BS and AP?
 We define an AP that is able to cooperate and be coordinated by a BS. We name
such an AP a Coordinated AP (a.k.a C-AP)
 C-AP provides cellular control connection for BS-AP coordination as well as WLAN
connectivity to devices and wired backhaul.
 The BS has control over the C-APs under its coverage. This means that the C-AP
is able to perform certain functions that is commanded by the BS.
WLAN GW
Coordinated AP
802.1X
IEEE802.16 ABS
Data
Plane
802.11
PHY/MAC
802.11
Control/
RRM
GLL
Control
Plane
802.11
Coordination
Function
802.16
PHY/
MAC
802.16
PHY/
MAC
PDN
CS
/IP
AAA/
HA
Possible scenarios
 Sharing access information
• BS provides access information on C-AP to a device connected to the BS.
 Reducing power consumption for detecting C-APs
• C-AP provides access information of BS to a device connected to the C-AP.
 Helps devices to perform handover to neighbor BS from C-AP
 Inter-AP coordination
• Coordinated Dynamic Channel Switching in the coverage area with heavy
interference
• Coordinated Dynamic Transmission Power Adjustment for mitigating
interference between APs
• Coordinated Capacity Sharing among APs for load balancing purpose
 Integrated QoS/Connection management
• Prioritized device scheduling
• Integrated security association
Proposed Text on IEEE 802.16ppc-10/0008r1
[Insert the following text ]
2.2.x BS-AP interworking by coordinated AP (C-AP)
In order to provide higher level of interworking function, cellular BS and WLAN AP
may help each other through the wired and wireless connection. Hierarchical
relations based on the coverage are defined between cellular BS and WLAN APs,
and BS may provide configuration/coordination information to the WLAN APs in
order to increase the interworking benefits. Coordinated AP (C-AP) is a WLAN AP
which has wireless connectivity to BS. A BS has controllability on the C-APs under its
coverage.
The BS and C-APs may have communication channel to talk to each other.
• The BS and C-APs can communicate for interworking.
• The C-APs can communicate with each other via BS’s relaying and/or moderation.
4.2 Multi Radio Access Technology
[R-X] IEEE 802.16 BS shall be able to communicate with IEEE 802.11 AP under its
coverage via wired and/or wireless (e.g., 802.16 air interface) control connection for
interworking operation. IEEE802.16 BS should be able to configure and control the
operation and configuration of the IEEE802.11 APs under its coverage.