tions in Uplink VolP- Video- Video -HTTP- nrtPS nrtPS E-Mail- E-Mail DL MAP BS Scheduler Functions in Downlink FIGURE 6-23 BS scheduler operation in downlink and uplink 6.10 Scheduling services for transmission over the air interface. IEEE 802. 16m provides a generic MAC control message at the called 2_Transfer that acts as a generic service container for various standards-defined services, including but not limited to: device provisioning bootstrap message to MS; GPS assistance delivery to MS; base station's geo-location unicast delivery to MS; IEEE 802.21-2009 Media Inde- pendent Handover standard message transfer; etc. 6.10.1 Persistent Scheduling Persistent scheduling is a technique used to reduce assignment overhead for connections with periodic traffic pattern and relatively fixed payload size. To allocate resources persistently to a single connection, the BS transmits separate DL or UL Persistent A-MAP IEs. The persistently allocated resource size, position, and the modulation and coding scheme, is maintained by the BS and MS until the assignment is de-allocated, changed, or an error occurs. The persistent scheduling does not include any consideration for HARQ re-transmission of data packets. The resources used for re-transmissions can be allocated one at a time as needed using a DL or UL Basic Assignment A-MAP IE. For persistent allocation in the DL or UL, the BS transmits the DL or UL Persistent A-MAP IE, respectively. Allocation of the persistently assigned resource begins in the DL or UL subframe that is referenced by the DL or UL Persistent A-MAP IE and repeats after an allocation period that is specified in the DL or UL Persistent A-MAP IE. The attributes of the persistently scheduled resource including size, location, MIMO encoder format, and modulation and coding scheme are maintained per DL or UL Persistent A-MAP IE. The values of HARQ Channel Identifier (ACID) xviii field, and the number of ACIDs in the DL or UL Persistent A-MAP IE are used together to specify an implicit cycling of HARQ channel 