1. January 2001 Thomas Kuehnel, NECSlide 1 doc.: IEEE 802.11-01/048 Submission Terms and Definitions See also contribution BRAN21d127

2. January 2001 Thomas Kuehnel, NECSlide 2 doc.: IEEE 802.11-01/048 Submission Terms Device = STA, MT –Mobile client that seeks service from a network infrastructure or wants to communicate with other devices. Network infrastructure –Fixed part of the network that provides services to Mobile clients; contains one or multiple Access Points. Coverage Area –Radio coverage of a transceiver belonging to a device or the network infrastructure in a given geographic location.

3. January 2001 Thomas Kuehnel, NECSlide 3 doc.: IEEE 802.11-01/048 Submission 3 Convergence Levels Coexistence Interworking Converged Standard

4. January 2001 Thomas Kuehnel, NECSlide 4 doc.: IEEE 802.11-01/048 Submission Coexistence Communicating devices using 802.11a or HiperLAN/2 can operate in the same coverage area without harmful interference by sharing the available channels by Using Frequency Sharing Etiquette based on Dynamic Frequency Selection, i.e, a device sensing a busy channel will rescan the busy channels in order to find a free channel. Using an agreed mechanism that enables both types of devices to share the same channel within the same coverage area.

5. January 2001 Thomas Kuehnel, NECSlide 5 doc.: IEEE 802.11-01/048 Submission Interworking Devices and Network Infrastructure using 802.11a and Devices and Network Infrastructure using HiperLAN 2 can operate in the same coverage area without harmful interference. Communication between devices or/and infrastructure adhering to the different standards can take place. Both standards keep their identity.

6. January 2001 Thomas Kuehnel, NECSlide 6 doc.: IEEE 802.11-01/048 Submission Webster’s definition Systems or components, possibly from different origins, working together to perform some task. Interworking depends crucially on standards to define the interfaces between the components. The term implies that there is some difference between the components which, in the absence of common standards, would make it unlikely that they could be used together.

7. January 2001 Thomas Kuehnel, NECSlide 7 doc.: IEEE 802.11-01/048 Submission Interworking Combinations 1. WLAN Type 1 device  WLAN Type 2 network 2. WLAN Type 1 network  WLAN Type 2 device 3. WLAN Type 1 device  WLAN Type 2 device Condition: Coexistence between networks using different standards.

8. January 2001 Thomas Kuehnel, NECSlide 8 doc.: IEEE 802.11-01/048 Submission Infrastructure Interworking Devices operating according to one of the standards can exchange data with network infrastructure (Access points) and with the second type of devices through the Access Point.

9. January 2001 Thomas Kuehnel, NECSlide 9 doc.: IEEE 802.11-01/048 Submission Hybrid Network Infrastructure Interworking from AP’s point of view Hybrid Radio Domain Hybrid AP (H2 + 802.11) Network MT (H2) STA (.11)

10. January 2001 Thomas Kuehnel, NECSlide 10 doc.: IEEE 802.11-01/048 Submission Hybrid MAC Infrastructure supports 802.11a and HL2 MAC/DLC Single mode terminal –Single low cost device –Standards have to be modified but keep key features –Network coexistence is implicit –Efficiency is compromised –Complex device-to-device communication (H2/802.11)

11. January 2001 Thomas Kuehnel, NECSlide 11 doc.: IEEE 802.11-01/048 Submission Dual MAC in Device (Dual Mode) Interworking from MT’s point of view HiperLAN2 Radio Domain 802.11 Radio Domain Network AP (H2) AP (.11) Hybrid MT (H2 + 802.11) Hybrid MT (H2 + 802.11)

12. January 2001 Thomas Kuehnel, NECSlide 12 doc.: IEEE 802.11-01/048 Submission Dual MAC Device can switch between 2 MAC /DLC (802.11a, HL 2) –Manual/automatic –Device cost is higher –No change in standards –Network coexistence has to be implemented –Easy Device-to-device Communication

13. January 2001 Thomas Kuehnel, NECSlide 13 doc.: IEEE 802.11-01/048 Submission Unified (Converged) Standard One standard is globally deployed Webster’s Unification: To make into or become a unit; consolidate. –Creation of new standard Timeline… –Adoption of one of the existing standards Adding features and dropping the respective other standard –High Complexity. –Features may be compromised. Timeline… Political decision Low device costs, Global roaming

14. January 2001 Thomas Kuehnel, NECSlide 14 doc.: IEEE 802.11-01/048 Submission Next Steps Creation of “realistic” usage scenarios –Enterprise –Home –Public access Selection of a convergence level Contributions