Antenna Form Factor Small Small Small Small Chip-scale spacing Current Full Duplex MACs A review of the current technical literature regarding MAC protocols that support the Full Duplex (FD) exchange of packets in an IEEE 802.11 network revealed an extensive bibliography of papers. Out of this extensive list, these, at the moment, three FD capable MAC protocols were selected as indications of the evolving maturity of the full duplex protocols. The criteria used to select these three protocols are listed in the first column labelled Attributes. Table : FD MAC Comparisons Attributes S-CW Full Duplex [5] SRB-MAC [6] STR-MAC [11] Organization Sabanaci U. Rice U. Toshiba Research Modifications of 2 bits in existing MAC Adds a 13 bit FD Hdr FD Capability Info existing Frame Formats Hdr ctrl field; 10 bit between the MAC Hdr Field; 1-bit mod of field at head of and the Payload reserved bits in CTS next_bo payload (CTS_FD) New MAC Mechanisms Synchronized contention Shared random backoff; Adaptive Tx & ACK window virtual backoff; header TO snooping Supports Yes If HD Nodes support Yes Heterogeneous FD/HD snooping, then Yes, else No Supports Homogeneous Yes Yes Yes FD WLAN BiDirectional FD Yes Yes Yes UniDirectional FD Yes Yes Yes Hidden Node Yes via FD & FDmaster Via Snooping Via RTS/CTS Mitigation bits in MAC Hdr ctrl fld. Backwards Compatible Yes If HD Nodes support Yes w/ HD WiFi snooping, then Yes, else No FD,Throughput Gain in 1.6x to 2.1x a BSS w/o hidden (40 to 2 nodes) nodes FD, Throughput Gain in 1.7x to 14.4x a BSS w/ hidden nodes (2 to 40 nodes) Real World Implementation of Full Duplex Operation in DOCSIS 3.1-FDX DOCSIS 3.1 R-PHY [12] and DOCSIS 3.1-FDX [13] provide yet another example of a wired protocol that borrows heavily from the wireless communications domain (e.g.11n-OFDM and 11ax OFDMA). Both DOCSIS 3.1 documents define the use of a full duplex protocol between cable modems (CM) and
Form Factor Antenna spacing Small Small Small Small Chip-scale Current Full Duplex MACs A review of the current technical literature regarding MAC protocols that support the Full Duplex (FD) exchange of packets in an IEEE 802.11 network revealed an extensive bibliography of papers. Out of this extensive list, these, at the moment, three FD capable MAC protocols were selected as indications of the evolving maturity of the full duplex protocols. The criteria used to select these three protocols are listed in the first column labelled Attributes. Table : FD MAC Comparisons Attributes S-CW Full Duplex [5] SRB-MAC [6] STR-MAC [11] Organization Sabanaci U. Rice U. Toshiba Research Modifications of existing Frame Formats 2 bits in existing MAC Hdr ctrl field; 10 bit next_bo field at head of payload Adds a 13 bit FD Hdr between the MAC Hdr and the Payload FD Capability Info Field; 1-bit mod of reserved bits in CTS (CTS_FD) New MAC Mechanisms Synchronized contention window Shared random backoff; virtual backoff; header snooping Adaptive Tx & ACK TO Supports Heterogeneous FD/HD Yes If HD Nodes support snooping, then Yes, else No Yes Supports Homogeneous FD WLAN Yes Yes Yes BiDirectional FD Yes Yes Yes UniDirectional FD Yes Yes Yes Hidden Node Mitigation Yes via FD & FDmaster bits in MAC Hdr ctrl fld. Via Snooping Via RTS/CTS Backwards Compatible w/ HD WiFi Yes If HD Nodes support snooping, then Yes, else No Yes FD,Throughput Gain in a BSS w/o hidden nodes 1.6x to 2.1x (40 to 2 nodes) FD, Throughput Gain in a BSS w/ hidden nodes 1.7x to 14.4x (2 to 40 nodes) Real World Implementation of Full Duplex Operation in DOCSIS 3.1-FDX DOCSIS 3.1 R-PHY [12] and DOCSIS 3.1-FDX [13] provide yet another example of a wired protocol that borrows heavily from the wireless communications domain (e.g.11n-OFDM and 11ax OFDMA). Both DOCSIS 3.1 documents define the use of a full duplex protocol between cable modems (CM) and
11-18-1127-02-00fd-new-text-for-fd-tig-report.docx