PH-DATA

X

X

Used to pass message units containing frames used for RLC/MAC layer respective peer‑to‑peer communications to and from the physical layer.

PH-RANDOM ACCESS

X

X

X

Used to request and confirm (in the MS) the sending of a random access frame and to indicate (in the network) the arrival of a random access frame.

PH-CONNECT

X

Used to indicate that the physical connection on the packet data physical channel has been established.

PH-READY-TO-SEND

X

Used by the physical layer to trigger, if applicable, piggy backing, the start of timer for the RLC/MAC layer and the forwarding a data unit to the physical layer

PH-EMPTY-FRAME

X

Used by the RLC/MAC layer to indicate that no frame has to be transmitted after receiving the PH‑READY‑TO‑SEND primitive