Doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 1 Next...
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May 2002 Y Inoue, et.al. ,NTT Laboratories Slide 1 doc.: IEEE 802.11-02/308r0 Submission Next Generation Wireless LANs Yasuhiko Inoue, Tetsu Sakata and Masahiro M orikura NTT mailto:[email protected]
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Transcript of Doc.: IEEE 802.11-02/308r0 Submission May 2002 Y Inoue, et.al.,NTT Laboratories Slide 1 Next...
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 1
doc.: IEEE 802.11-02/308r0
Submission
Next Generation Wireless LANs
Yasuhiko Inoue, Tetsu Sakata and Masahiro MorikuraNTT
mailto:[email protected]
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 2
doc.: IEEE 802.11-02/308r0
Submission
Agenda
1. Bit Rate
2. Frequency Band
3. Access Control Mechanism
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 3
doc.: IEEE 802.11-02/308r0
Submission
1. Bit Rate
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 4
doc.: IEEE 802.11-02/308r0
Submission
Bit Rate• How it should be?• Scenarios:
– Private networks in the office environment• 100 Base-TX (with in a LAN segment)
• GbE or 10G Ethernet (Backbone)
– Internet access in the home or SOHO• FTTH (100M bit/s)
– Home networks• AV transmissions
• Information appliances
• Interwork with other devices such as IEEE 1394 and USB
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 5
doc.: IEEE 802.11-02/308r0
Submission
Bit Rate (Cont’d)• Constrains:
– Available bandwidth
– Number of channels
• Basic Rate of 100M bit/s will be reasonable• Some optional rates, e.g.) x2, x4, ...
• Basic Rate of 100M bit/s will be reasonable• Some optional rates, e.g.) x2, x4, ...
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 6
doc.: IEEE 802.11-02/308r0
Submission
2. Frequency Band
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 7
doc.: IEEE 802.11-02/308r0
Submission
Frequency Band
OFDM is going to be a common PHY mechanism
in 2.4 GHz and 5 GHz bands
2000 2001 2002 20031999 2004
2.4 GHz band
5 GHz band 802.11a (OFDM)
802.11g (CCK+OFDM)
802.11b (CCK)
• TGg is adopting the OFDM technique in 2.4GHz band
year
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 8
doc.: IEEE 802.11-02/308r0
Submission
Frequency Band (Cont’d)
802.11b/g
2400 2483.5 5150 5250 5350
802.11a/h
[MHz]
• Number of channels available– 2.4GHz; 3 channels for 11b systems
– 5GHz; 12 channels, U.S. (U-NII lower, middle, upper bands)
19 channels, Europe (5.15-5.25, 5.25-5.35, 5.47-5.725 GHz)
4 channels, Japan (5.15-5.25 GHz)
Japan
U.S. and Europe
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 9
doc.: IEEE 802.11-02/308r0
Submission
Frequency Band (Cont’d)
• Some functions or services requires many channels to avoid interference– Examples:
• QoS support
• Public Wireless LAN services
– Number of required channels depends on the PHY
– 2.4GHz and 5GHz bands should be considered as a unified frequency band for the next system
Target frequency band should be both 2.4GHz and 5GHzTarget frequency band should be both 2.4GHz and 5GHz
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 10
doc.: IEEE 802.11-02/308r0
Submission
Frequency bands and PHY
CCK
PBCC(option)
CCK-OFDM(option)
PBCC(option)
OFDM
802.11b802.11g
802.11a
OFDM
2.4GHz
5GHz
NewPHY???
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 11
doc.: IEEE 802.11-02/308r0
Submission
3. Access Control Mechanism
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 12
doc.: IEEE 802.11-02/308r0
Submission
Access Control Mechanism• IEEE 802.11 MAC
– DCF and PCF (original)
– QoS support (TGe)
– Security Enhancements (TGi)
• Requirements for the new MAC protocol– Improved spectrum efficiency
– Interoperability with legacy devices
How should we develop a new MAC protocol?
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 13
doc.: IEEE 802.11-02/308r0
Submission
New MAC Protocol #1• Extend 802.11 original MAC
• New MAC– Backward compatibility with legacy devices
802.11Legacy MAC
QoSSupport
Security
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 14
doc.: IEEE 802.11-02/308r0
Submission
New MAC #2• New MAC protocol coexisting with legacy MAC
– Legacy devices are replaced by the new devices gradually
– Legacy and new devices can coexist in the transitional period
802.11Legacy MAC
QoSSupport
Security
New MAC Protocol
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 15
doc.: IEEE 802.11-02/308r0
Submission
New MAC #3• Replace legacy MAC with a new MAC
– It may be a chance to replace the MAC completely
802.11Legacy MAC
QoSSupport
Security
New MAC Protocol
but,Is it acceptable?
May 2002
Y Inoue, et.al. ,NTT LaboratoriesSlide 16
doc.: IEEE 802.11-02/308r0
Submission
Summary• Bit Rate
– Basic rate 100 M bit/s with options
• Frequency Band– 2.4GHz / 5GHz / Both
• Access Control Mechanism– Improve the efficiency (reduce the overhead)
– Backward compatibility will be required
