Transmission Modes for Multi-Radio Access in Hierarchical Networks
[IEEE 802.16 Presentation Submission Template (Rev. 9.2)]
Document Number:
IEEE C80216ppc-11_0015
Date Submitted:
2011-11-05
Source:
Hyukjoon Lee
Voice:
Kwangwoon University
E-mail:
hlee@kw.ac.kr
*<http://standards.ieee.org/faqs/affiliationFAQ.html>
Re:
IEEE 802.16ppc-11/0005r1 and IEEE L802.16-11/0058r1
Base Contribution:
None
Purpose:
For discussion in the Project Planning Committee
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.
Copyright Policy:
The contributor is familiar with the IEEE-SA Copyright Policy <http://standards.ieee.org/IPR/copyrightpolicy.html>.
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 >.
Introduction
• Multi-RAT technologies are widely accepted as a costeffective alternative to capacity enhancement.
• Multiple wireless interfaces are common in newest mobile
wireless devices such as smart phones.
– IEEE 802.11 and WCDMA
– IEEE 802.11 and IEEE 802.16e
• Hierarchical Network is currently being discussed as one of
the candidate mobile network technologies for the future.
Hierarchical Networks in Multi-RAT
Deployment Scenarios
• Two multi-RAT usage scenarios are being considered:
– Virtual Carrier
• Simultaneous communication with both IEEE 802.16 BS and IEEE 802.11 AP
• Using both IEEE 802.16 and IEEE 802.11 connectivity for enhanced spectrum utilization
• IEEE 802.16 traffic offload via IEEE 802.11 link
– Enhanced Tethering (Multi-RAT Client Cooperation)
• Using IEEE802.11 link to communicate with a multi-RAT helper device
• Using both the direct IEEE 802.16 link and indirect IEEE 802.11 link to communicate with the
IEEE 802.16 BS for enhanced spectrum utilization
• Link switching between direct IEEE 802.16 and indirect IEEE 802.11 links
• Need to discuss how transmission of data flows can be handled
– To propose three transmission modes of data flows
Transmission Mode 1: Single-Link Flow
• A flow is assigned to either a direct IEEE 802.16 link or an
indirect IEEE 802.11 link.
– Standardized negotiation procedures and IEs for link selection may be
necessary
• Some criteria
– Signal strength
– AP/BS load
– QoS support
– Etc.
Coordinated Multi-Rat
AP(including including
IEEE 802.11 and
IEEE802.16) AP
IEEE 802.16 BS
IEEE 802.11 link
IEEE 802.16 link
IEEE802.11
device
Flow 1
Dual RAT device
Flow 2
Transmission Mode 2: Multi-Link Flow
• MPDUs belonging to a single flow are distributed among
direct IEEE 802.16 link and indirect IEEE 802.11 link for
enhanced spectrum utilization
– L2 reassembly function needed
– Use of IEEE 802.11 4-address
structure/L2 tunneling
Coordinated Multi-Rat
AP(including including
IEEE 802.11 and
IEEE802.16) AP
IEEE 802.16 BS
IEEE 802.11 link
IEEE 802.16 link
IEEE802.11
device
Flow 1
Dual RAT device
Transmission Mode 3: Cooperative-Link Flow
• The same MPDUs (may be coded differently) of a flow are
transmitted both on direct and indirect links
– Repeat diversity
– Transmit diversity
Coordinated Multi-Rat
AP(including including
IEEE 802.11 and
IEEE802.16) AP
IEEE 802.16 BS
IEEE 802.11 link
IEEE 802.16 link
IEEE802.11
device
Flow 1
Dual RAT device
Flow 1’
Summary
• There are different ways that flows can make
use of multi-RAT links
• Proposed three transmission modes:
– Single-link flows
– Multi-link flows
– Cooperative flows
• Contribution to update the Study Report?