Simulation of 802.21 Handovers Using ns-2

Table 1

Supported and unsupported features in ns-2 WiMAX module.

Available features	Features not implemented
(i) Wireless MAN-OFDM physical layer with configurable modulation	(i) Wireless MAN-OFDMA
(ii) Time Division duplexing (TDD)	(ii) Frequency Division duplexing (FDD)
(iii) Management messages to execute network entry (without authentication)	(iii) (ARQ) Automatic Repeat Request
(iv) Default scheduler providing round robin uplink allocation to registered Mobile      Stations (MSs) according to bandwidth requested	(iv) Service Flow and QoS scheduling
(v) IEEE 802.16e extensions to support scanning and handovers	(v) Periodic ranging and power adjustments
(vi) Fragmentation and reassembly of frames	(vi) Packing
	(vii) Error Correction