In-frame querying to utilize full duplex communication in IEEE 802.11ax

Toward an efficient and coordinated control of full‐duplex radio communications in high‐efficiency wireless local area networks

“…For that reason, the DL data stream is usually the most frequent but especially the most voluminous data stream compared to the UL data stream. The imbalance is known as the problem of asymmetry between the lengths of DL and UL data streams 18 …”

“…This section is dedicated to implementing, simulating, and performance evaluating the ECC‐FDRC protocol. A comparison is then made with two well‐known Full‐Duplex MAC protocols (namely, In‐Frame‐Querying 18 and O2‐MAC 20 ) to assess the effectiveness of the ECC‐FDRC protocol. To this end, simulation tools and parameters are given in Section 5.1.…”

“…In order to demonstrate the extent of our contribution, a comparison is made with two other FD MAC protocols (In‐Frame‐Querying 18 and O2‐MAC 20 ) having principles closest to the ECC‐FDRC protocol. In‐Frame‐Querying is a protocol that addresses the hidden stations issue and the asymmetry between the lengths of DL and UL frames.…”

“…It is essentially characterized by a coordinated control (between the access point and the stations associated with it) for collecting and distributing control information, and based on the OFDMA transmission technique during the different signalization phases to make this control efficient. The performance evaluation of the ECC‐FDRC protocol and its comparison with In‐Frame‐Querying 18 and O2‐MAC 20 protocols have enabled to demonstrate the relevance of all procedures that constitute it, among other things: scheduling and access policy of the different configurations of FD radio communications, handling of hidden and exposed stations in a UFD communication, managing the opportunity window related to the imbalance between DL and UL traffics, encoding and transmitting control signals, and so on. In fact, the performance metrics measured (namely, unsaturated and saturated throughput, overhead, service rate, loss ratio, and fairness index) are distinctively improved, especially when the network is dense and/or the DL traffic is voluminous.…”

“…The imbalance is known as the problem of asymmetry between the lengths of DL and UL data streams. 18 Consequently, almost every time that there is a Full-Duplex communication whether in bidirectional or unidirectional mode, an OW is created immediately after the transmission end of the UL data stream and it lasts for the remainder of the transmission of the DL data stream. 19 As shown in Figure 4, the opportunity window represents the difference between the transmission time of the DL data stream and that of the UL data stream.…”