Seamless Handoff

1
Seamless Handoff Standards Between WLAN and
Cellular Networks

• Dr. Dong-Jye Shyy
• MITRE
• Jan. 2004, Vancouver

2
Introduction

• This briefing is to seek consensus on the issue
  if there should be standardized algorithms for
  seamless handoff between WLAN and cellular
  networks

3
Background

• IS-95/cdma2000 has standardized algorithms for
  (soft) handoff. The standards specify
• What to measure
• When to add a cell and when to delete a cell
  based on the measurements
• W-CDMA also has standardized algorithms for
  (soft) handoff
• GSM has no standardized handoff algorithms for
  (hard) handoff
• Intra-WLAN handoff (a.k.a. IAPP) is only a
  recommended practice, not a standard

4
Questions

• Should this group standardize the procedures of
  performing seamless handoff between WLAN and
  cellular networks?
• This task is easier for handoff between WLAN and
  CDMA networks
• Not sure how to tackle the handoff between WLAN
  and GSM network since even GSM itself does not
  have standardized handoff algorithms?

5
Conclusion

• Suggest to work on standardized seamless handoff
  procedure between WLAN and CDMA networks (both
  cdma2000 and W-CDMA) as the first priority
• Work on recommended practice for seamless
  handoff procedures between WLAN and GSM network
  as the second priority