1. Backward Compatibility Feature for 802.11aj
Sept 2012
doc.: IEEE /xxxxr0
Jan 2013
Backward Compatibility Feature for aj
Date:
Presenter:
Xiaoming Peng
Xiaoming Peng / I2R

2. Author List
Jan 2013
Xiaoming Peng

3. Jan 2013
Abstract
This document is to describe the understanding of the backward compatibility feature for aj
This contribution has been discussed in CWPAN group
Xiaoming Peng

4. Jan 2013
Background
IEEE aj PAR specified backward compatibility to IEEE ad.
Definition of backward compatibility is crucial to aj in deciding the level of support required.
There is no consensus yet on the meaning of backward compatibility.
In this presentation, we present a definition based on broad principles of fairness and efficiency.
Seek to achieve a broad consensus within aj Task Group if possible or identified the points of contention for future resolution.
Xiaoming Peng

5. Backward Compatibility Feature
Jan 2013
Backward Compatibility Feature
802.11aj MAC
(amendment to amendment to ad)
802.11aj STA
802.11aj PHY in 45GHz
60GHz
802.11ad PHY
802.11aj PCP
802.11ad STA
802.11aj PHY in 60GHz
Scenario: aj (60GHz)
802.11aj Architecture
Only when aj device operates over Chinese 60GHz channel, it is required to keep the backward compatibility to ad
Xiaoming Peng

6. Compatibility Modes (IEEE 802.11 Precedent)
Jan 2013
Compatibility Modes (IEEE Precedent)
IEEE n supports three compatibility modes to a/b/g
Legacy Mode
Mixed Mode
Greenfield Mode
We propose 11aj support three correspondingly compatibility modes to 11ad
Large Band Only Mode (Legacy Mode)
802.11aj only operate as ad device (Outside China).
802.11aj can support both the ad STAs and aj STAs.
Exclusive Mode
No backward compatibility to ad device
Xiaoming Peng

7. Jan 2013
Legacy Mode
802.11aj devices will operate according to ad channels and protocols.
No new protocols required.
Used primarily when aj devices are operating outside of China.
Xiaoming Peng

8. Jan 2013
Exclusive Mode
The aj network only support aj STAs, need to inform ad devices that the channel has been occupied
No backward compatibility to ad.
Xiaoming Peng

9. Jan 2013
Mixed Mode
802.11aj BSS can support the operation of both the 11ad devices and 11aj devices.
802.11ad STAs able to join the network and perform data exchange with other devices(AP/PCP and STAs) in aj BSS
802.11aj STAs able to join the network and perform data exchange with other aj STAs;
Formation of new network
802.11ad AP/PCPs can start a new network if channel is available.
Xiaoming Peng

10. Principles in Determining Channel Access
Jan 2013
Principles in Determining Channel Access
Principle: Equal priority between IEEE ad and IEEE aj STA.
Application of the principles to the different operating scenarios
Formation of new network
New STAs joining existing network
Xiaoming Peng

11. Jan 2013
Thank YOU
Xiaoming Peng