Section: 4.5.2 MM connection information transfer phase
Content: After the MM connection has been established, it can be used by the CM sublayer entity for information transfer. According to the protocol architecture described in 3GPP TS 24.007[ Mobile radio interface signalling layer 3; General Aspects ]  [20], each CM entity will have its own MM connection. These different MM connections are identified by the protocol discriminator PD and, additionally, by the transaction identifier TI. All MM common procedures may be initiated at any time while MM connections are active. Except for Short Message Control which uses a separate layer 2 low priority data link, no priority mechanism is defined between the CM, MM and RR sublayer messages.