Question

Suppose there are two ISPs providing IEEE 802.11b service in the same coffee shop, with each ISP operating its own access point (AP) and having its own block of IP addresses. Further, suppose that one AP operates on channel 1 and the other operates on channel 11. What is the maximum aggregate data rate that can be provided to the customers of the two ISPs (assume all transmissions occur at the maximum data rate of IEEE 802.11b)?

Answer 1

Solution:

• The two APs will typically have different SSIDs and MAC addresses.
• A wireless station arriving at the café will associate with one of the SSIDs (that is, one of the APs).
• After association, there is a virtual link between the new station and the AP.
• Label the APs AP1 and AP2. Suppose the new station associates with AP1.
• When the new station sends a frame, it will be addressed to AP1.
• Though AP2 will also receive the frame, it will not process the frame because the frame is not addressed to it.
• Thus, the two ISPs can work in parallel over the same channel.
• However, the two ISPs will be sharing the same wireless bandwidth. If wireless stations in different ISPs transmit at the same.

What is the maximum aggregate data rate that can be provided to the customers of the two ISPs (assume all transmissions occur at the maximum data rate of IEEE 802.11b)?

If two wireless stations in different ISPs transmit at the same time, there will not be a collision.
Thus, the maximum aggregate transmission rate for the two ISPs is 22 Mbps for 802.11b.

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