METHOD AND SYSTEM FOR VOICE CALL SETUP FROM A PCH OR FACH STATE
A method at a user equipment for establishing a circuit switched call, the user equipment being in a Cell Forward Access CHannel (CELL_FACH) state, a Cell Paging CHannel (CELL_PCH) state or a UTRAN Registration Area Paging CHannel (URA_PCH) state, the method receiving an indication that a circuit switched call is pending, sending to a network element a message to facilitate the user equipment to transition to a Cell Dedicated CHannel (CELL_DCH) state, the message being a Traffic Volume Measurement Report indicating uplink data traffic exceeds a predetermined threshold; and establish the circuit switched call.
1 . A method at a user equipment for establishing a circuit switched call, the user equipment being in a Cell Forward Access CHannel (CELL_FACH) state, a Cell Paging CHannel (CELL_PCH) state or a UTRAN Registration Area Paging CHannel (URA_PCH) state, the method comprising:
receiving an indication that a circuit switched call is pending;
sending to a network element a message to facilitate the user equipment to transition to a Cell Dedicated CHannel (CELL_DCH) state, the message being a Traffic Volume Measurement Report indicating uplink data traffic exceeds a predetermined threshold; and
establishing the circuit switched call.
2 . The method of claim 1 , wherein no uplink data traffic exists.
3 . The method of claim 1 , wherein, prior to the sending, checking whether the network element supports fast transition for causing the user equipment to transition to a CELL_DCH state and, if yes, blocking the sending.
4 . The method of claim 3 , wherein, if the network element supports fast transition, the method further comprising storing information that the network element supports fast transition.
5 . The method of claim 4 , wherein the stored information is set based on a learning phase on the user equipment.
6 . The method of claim 4 , wherein the stored information is reset upon radio re-activation or network change.
7 . A user equipment configured for establishing a circuit switched call, the user equipment being in a Cell Forward Access CHannel (CELL_FACH) state, a Cell Paging CHannel (CELL_PCH) state or a UTRAN Registration Area Paging CHannel (URA_PCH) state, the user equipment comprising:
a processor; and
a communications subsystem,
wherein the processor and communications subsystem cooperate to:
receive an indication that a circuit switched call is pending;
send to a network element a message to facilitate the user equipment to transition to a Cell Dedicated CHannel (CELL_DCH) state, the message being a Traffic Volume Measurement Report indicating uplink data traffic exceeds a predetermined threshold; and
establish the circuit switched call.
8 . The user equipment of claim 7 , wherein no uplink data traffic exists.
9 . The user equipment of claim 7 , wherein, the processor and communications subsystem cooperate to, prior to the sending, check whether the network element supports fast transition for causing the user equipment to transition to a CELL_DCH state and, if yes, blocking the sending.
10 . The user equipment of claim 9 , wherein, if the network element supports fast transition, the processor and communications subsystem further cooperate to store information that the network element supports fast transition.
11 . The user equipment of claim 10 , wherein the stored information is set based on a learning phase on the user equipment.
12 . The user equipment of claim 10 , wherein the stored information is reset upon radio re-activation or network change.