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In this paper, the authors study the existing standards in multihop WiMAX networks and their security issues. For secured communications, it is necessary to have hop-by-hop authentication for any multihop wireless networks. WiMAX multihop networks provide default hop-by-hop authentication in a distributed security mode only. Apart from this, the multihop standards should consider the existing security issues in mobile WiMAX standard. It provides the solution for Medium Access Control (MAC) - control message issues. At the same time, network coding is used for Enhanced Multicast Broadcast Service (E-MBS) retransmission to improve the performance of MBS. However, the standard IEEE 802.16m/D4 is not able to consider the security threats for multihop support, network coding, and ranging.
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