Abstract
When the preambles of a wideband 802.11n/ac frame transmission are affected by a collision with a 20MHz frame on one of the subchannels, a receiver might fail to decode the whole wideband frame. Experimental evaluations with off-the-shelf 802.11n hardware showed that the vulnerability of wideband frame transmission to a narrowband collision/interference is a real problem. To mitigate the severe impact of narrowband collision/interference on wideband transmission, we propose to transmit several 20MHz frames in parallel instead of a single wideband frame so that a narrowband collision on one of the subchannels affects only the parallel frame transmitted on that subchannel. Performance evaluations demonstrated that the proposed parallel frame transmission scheme significantly improves the throughput and delay performance of wideband transmissions under different traffic and channel conditions. While the throughput performance of the proposed scheme for saturated traffic conditions was analytically validated, extensive simulation-based evaluations showed that the proposed scheme achieves great performance improvement for unsaturated traffic conditions and hidden node environment.
Highlights
In recent years, wireless local area network (WLAN) technology has achieved tremendous improvements in both physical (PHY) and medium access control (MAC) layers
In this paper, we have addressed the vulnerability of 802.11n/ac wideband transmission to a narrowband collision
According to the current IEEE 802.11n/ac standard, when a wideband PPDU transmission on multiple narrowband channels encounters a collision on one of the narrowband channels, the whole wideband PPDU is affected. To mitigate such vulnerability of wideband transmissions, we proposed a parallel PPDU transmission scheme, which transmits multiple 20MHz PPDUs in parallel instead of a single wideband PPDU
Summary
Wireless local area network (WLAN) technology has achieved tremendous improvements in both physical (PHY) and medium access control (MAC) layers. While the enhanced RTS/CTS achieves performance gains in the presence of hidden interference on SCHs, the mechanism introduces an undesirable overhead which is sometimes larger than the transmission duration of actual data PPDU. While the existing works in literature mainly try to solve serious performance degradation problems related to interference and channel allocation, the fundamental problem related to the vulnerability of existing wideband PHY packet structure to collision/interference on one of the subchannels stays untouched. We propose a new parallel PPDU transmission scheme, which mitigates the severe impact of narrowband collision/interference on throughput and delay performance by transmitting several 20MHz-wide PPDUs in parallel.
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