january 2001 thomas kuehnel, necslide 1 doc.: ieee 802.11-01/048 submission terms and definitions...

January 2001

Thomas Kuehnel, NECSlide 1

doc.: IEEE 802.11-01/048

Submission

Terms and Definitions

See also contribution BRAN21d127

January 2001


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.

January 2001


doc.: IEEE 802.11-01/048

Submission

3 Convergence Levels

• Coexistence

• Interworking

• Converged Standard

January 2001


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.

January 2001


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.

January 2001


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.

January 2001


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.

January 2001


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.

January 2001


doc.: IEEE 802.11-01/048

Submission

Hybrid Network Infrastructure

Interworkingfrom AP’s point of view

HybridRadio Domain

Hybrid AP(H2 + 802.11)

Network

MT(H2)

STA(.11)

January 2001


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)

January 2001


doc.: IEEE 802.11-01/048

Submission

Dual MAC in Device(Dual Mode)

Interworkingfrom MT’s point of view

HiperLAN2Radio Domain

802.11Radio Domain

Network

AP(H2)

AP(.11)

Hybrid MT(H2 + 802.11)

Hybrid MT(H2 + 802.11)

January 2001


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

January 2001


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

January 2001


doc.: IEEE 802.11-01/048

Submission

Next Steps

• Creation of “realistic” usage scenarios – Enterprise– Home– Public access

• Selection of a convergence level

• Contributions

january 2001 thomas kuehnel, necslide 1 doc.: ieee 802.11-01/048 submission terms and definitions...

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