Cell switching mechanisms for access point sharing in WLAN over radio-over-fiber systems

A Detection‐Switching‐Assisted DCF Mechanism for Simulcast WLAN‐over‐Fiber Based Distributed Antenna Systems

“…Additionally, the D-S performance is much better than the soft switching method compared with the work in Ref. [6].…”

“…It should be noticed here that, in this situation, for the users, although the uplink is disconnected to the AP, it can also receive the beacon frames, which is dif-ferent from the hard switch approach in Ref. [6] that the switch can disconnect the uplink and downlink together. Keeping receiving the beacon frames makes sure that the user stations won't lose connections from the AP.…”

“…Therefore, the condition of the hard switching method is not as ideal as the simulation in Ref. [6] did. Additionally, the D-S performance is much better than the soft switching method compared with the work in Ref.…”

“…An improvement of 3.74%, which is the ratio of average improvement of switch mechanism to the average throughput of RTS/CTS mode, can be observed in 1500 Bytes situation and 17.01% and 36.76% in 1000 Bytes and 500 Bytes respectively, which shows the switch mechanism works more effectively than the DCF RTS/CTS mode. It should be noticed here that the research [6] also provided some methods to alleviate the uplink collision problem. It can be observed that in 1500Bytes situation the hard switching method can achieve 25Mbps throughput when there are ten user in the network and soft switching method can achieve 12Mbps throughput in the same situation, however, in D-S mechanism is 20Mbps.…”

“…In order to solve the uplink congestion problem, some switching methods have been reported in Ref. [6], both soft switch-ing schemes and hard switching schemes are shown to offer some improvements upon basic mode and RTS/CTS mode. However, both schemes have some pros and cons, for hard switching scheme user stations are easy to disconnect to the AP when the network load is high, and little improvement can be achieved with soft switching method, even worse than RTS/CTS mode.…”