Transcript Coexistence issue in 802.11

Jan 2006
doc.: IEEE 802.19-06/0004r0
Coexistence issue in 802.11 VoIP
in the presence of 802.15.1
Date: 2006-01-17
Authors:
Name
Company
Address
Phone
email
Tom Siep
CSR
2425 N. Central
Expressway,
Richardson, TX
75040
+214 558
4358
[email protected]
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Submission
Slide 1
Tom Siep, Cambridge Silicon Radio Plc
Jan 2006
doc.: IEEE 802.19-06/0004r0
Abstract
Discussion of coexistence issue in 802.11 VoIP in the
presence of 802.15.1
Submission
Slide 2
Tom Siep, Cambridge Silicon Radio Plc
Jan 2006
doc.: IEEE 802.19-06/0004r0
Attributes of the Problem
• 802.11:
– Needs a level of QoS to maintain a VoIP connection with an
acceptable level of service
– Uses a random, logarithmically increasing back-off in the presence
of interference
• 802.15.1
– Uses all of the 2.4 GHz band
– Generally cannot be aware of 802.11
– 802.15.1 does not care, nor is effected by 802.11
Submission
Slide 3
Tom Siep, Cambridge Silicon Radio Plc
Jan 2006
doc.: IEEE 802.19-06/0004r0
Issue
• It is very likely that VoIP applications will be in close
proximity to 802.15.1
• In the presence of 802.15.1, 802.11 may react by
decreasing band utilization to the point where VoIP is
compromised beyond usability
Submission
Slide 4
Tom Siep, Cambridge Silicon Radio Plc
Jan 2006
doc.: IEEE 802.19-06/0004r0
Possible Approaches
• Out of band exchange of band utilization if systems are
co-resident
• Heuristic determination of nature of interferer and
reacting appropriately.
– Case 1: Bluetooth – ignore interference and maintain (or increase)
transmissions
– Case 2: Other 802.11
• Negotiation if possible
• Use current back-off if necessary
– Case 3: Noise source (e.g. microwave oven) – ignore interference
and maintain (or increase) transmission
Submission
Slide 5
Tom Siep, Cambridge Silicon Radio Plc
Jan 2006
doc.: IEEE 802.19-06/0004r0
Action?
• Nada will supply background information and
recommendations on 802.15.2 work in this area
• Tom will present this to Wi-Fi WCC and VoWi-Fi
groups
• Tom will ask WNG of 802.11 if they believe this activity
is in their scope
Submission
Slide 6
Tom Siep, Cambridge Silicon Radio Plc