s message is sent by the Normal Operation Encrypted/ICV Unicast ARQ Discard transmitter when skipping Discard a number of ARQ blocks. AAI_ARQ-Reset The transmitter or receiver Normal Operation ARQ-Reset Encrypted/ICV Unicast ARQ Reset may send this message to reset the parent connection's ARQ transmitter and receiver state machines. AAI_SON-ADV A message that is used by the Self Organization Encrypted/ICV Unicast SON Advertisement BS to broadcast relevant Self- Message Organizing Network (SON) information for action types such as BS Reconfiguration, BS Restart, BS Scanning, or BS Reliability. 6.8 Connection and session management 6.8 CONNECTION AND SESSION MANAGEMENT A session is defined as the duration of time from the moment that an MS performs initial network entry and registers with the network and an exclusive MS context is generated in the network until the MS signs off the network and the MS context is flushed out. During this time, the MS may transit between different states (Initialization, Access, Connected, and Idle States) and may perform a number of network re-entries and re-register with the serving BS on transition from Idle to Con- nected State. In the IEEE 802.16-2009 standard, a connection is defined as uni-directional mapping between base station and mobile station MAC layers. Connections are identified by a 16-bit connection identifier. There are two types of connections, i.e., management and transport connections, where the management connections can be basic, primary, or secondary type. The basic connection is used by the BS and MS MAC layers to exchange short and time-sensitive MAC control messages. The primary management connection is utilized by the BS and MS MAC layers to exchange long and delay-tolerant MAC control messages. In IEEE 302.16m, a connection is defined as a mapping between the MAC layers of a BS and one or more mobile stations. When the mapping is between a BS and an MS, the connection is called a unicast connection. Otherwise, it is a multicast or broadcast connection. Uni