MAC-ehs PDU Structure with Example
There are two different types of MAC HSDPA PDU format depending upon the upper layer configuration. MAC-hs MAC-ehs In this tutorial only MAC-ehs is covered. In this case the MAC HSDPA PDU is consists of MAC-ehs header One or more reordering PDUs Each reordering PDU consists of one or more reordering SDU belonging to the same priority queue. Header Elements LCH-ID (Logical Channel Identifier): 4 bits The LCH-ID field provides identification of the logical channel at the receiver and the re-ordering buffer destination of a reordering SDU. LCH-ID Designation 0000 Logical Channel 1 0001 Logical Channel 2 . . . . . . . . . . . . . . . . . . . . . . . 1110 Logical Channel 15 1111 Logical Channel 16 TSN (Transmission Sequence Number): 6 bits The TSN field provides an identifier for the transmission sequence number on the HS-DSCH. The TSN [...]
MAC HSDPA PDU (MAC-hs)
There are two different types of MAC HSDPA PDU format depending upon the upper layer configuration. MAC-hs MAC-ehs In this tutorial only MAC-hs is covered. MAC-hs In this case the MAC HSDPA PDU is consists of MAC-hs header One or more MAC-hs SDU NOTE: A maximum of one HSDPA PDU is transmitted in on TTI Header Elements VF (Version Flag): 1 bit VF field is there to provide extension capabilities. This should be set to zero for now Queue ID (Queue Identifier): 3 bits The Queue ID field provides identification of the reordering queue in the receiver. TSN (Transmission Sequence Number): 6 bits or 9 bits The TSN field provides an identifier for the transmission sequence number on the HS-DSCH. The TSN field is used for reordering purposes to support in-sequence delivery to higher layers. NOTE: Only for TDD 1.28 Mcps configuration TSN can have a value of 6 bits [...]
