On the contrary, a logical mesh consists of nodes using wide beams to create multiple
logical links with its neighbors. IEEE 802.16 MAC operation is completely defined for
logical mesh using OFDM-PHY, whereas physical mesh operation may still require
some more work. Despite the mesh MAC protocol sharing substantial similarity with
the PMP MAC protocol, they are not interoperable.
One of the most important differences between a PMP and Mesh network is that,
unlike in PMP networks where all communications are connection-oriented, Mesh
network communications are connectionless. All direct communications between two
nodes are in the context of a link, specified by an 8-bit number called a Link ID (in place
of CID), unique only in the local neighborhood. QoS parameters are not associated with
Link IDs but instead are associated with each packet and are specified by parameters
in the packet header. The destination of a packet is also identified by a 16-bit Node ID
specified in the packet header.
A key prerequisite for a Mesh network is the ability of more than two pairs of nodes to
communicate directly. In a logical Mesh network, this means all transmissions among
different nodes have to be coordinated and scheduled such that a communication between
one pair of nodes will not interfere with a communication between another
pair of nodes.
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