Wimax standards and Security The Wimax

2.9 IEEE 802.16k
IEEE 802.16k (IEEE NetMan-TG, 2006a) was created in March 2006 by the Network Management Study Group to develop a series of standards as amendments to IEEE 802.16 and IEEE 802.1D for 802.16 MAC layer bridging. The 802.16k study group is working to define the necessary procedures and MAC layer enhancements to allow 802.16-2004 to support bridge functional- ity defined in 802.1D. Transparent bridges assume LAN-like communication of all 802.x technologies, where transmission of one node is heard by all nodes on the same LAN. However, 802.16-2004 devices may filter trans- mission by address, preventing its attached bridges from bridge address learning. 802.16k (Johnston, 2006) addresses this problem by describing how the internal sublayer service (ISS) is mapped onto the 802 convergence sublayer and how the packets are subsequently treated so that the service

below the ISS closely models LAN behavior sufficiently so that the bridge can work. Furthermore, 802.16k provides explicit support for 802.1p end-to-end priority data through explicit one-to-one mapping of user priority.

2.10 IEEE 802.16h
IEEE 802.16’s License-Exempt (LE) Task Group was initiated in December 2004 to develop a standard to improve coexistence mechanisms for license- exempt spectrum operation. The main purpose of IEEE 802.16h (IEEE LE- TG, 2006) is to develop improved MAC mechanisms to enable coexistence among licensed-exempt 802.16-2004 devices and facilitate coexistence with other systems using the same band. The amendment is in process, with scope for producing mechanisms that are applicable for the whole uncoordinated frequency spectrum defined by 802.16-2004.
802.16h designs a coexistence protocol, which is defined at the IP level and is mainly intended for BS-BS communication. The coexistence protocol intro- duces mechanisms for rental and negotiation of spectrum radio resources between BSs within the interference range. The procedures used by the coexistence protocol for interference resolution is based on separating the interference in the frequency and time domains. The separation of interfer- ence in the frequency domain is undertaken first, followed by the separation of remaining interference in the time domain.