Cellular phone with push to talk over cellular (POC) service

1 . A method for push to talk over cellular (PoC) operation, comprising:

providing a PoC button associated with a cellular phone;

detecting the PoC button has been pressed and released a first time, wherein the time length the PoC button has been pressed does not exceed a first time limit;

detecting the PoC button has been pressed and released a second time, wherein the time length the PoC button has been pressed the second time does not exceed the first time limit, wherein the time difference between the first and second times of releasing the PoC button does not exceed a second time limit;

assigning the PoC button a pressed button status when the PoC button has been pressed and then released the second time;

sending a floor grant request to establish an outward voice communication;

receiving a floor grant message; and

establishing and maintaining the outward voice communication, wherein the PoC button is associated with the pressed button status.

2 . The method of claim 1 , further detecting the PoC button has been pressed and released a third time after the outward voice communication has been established, and sending a floor release request.

3 . The method of claim 1 , further comprising determining a time length of a silent period after the outward voice communication has been established, and sending a floor release request when the silent period exceeds a third time limit.

4 . The method of claim 1 , further assigning the PoC button a non-pressed button status when the button is pressed and released a third time before the floor grant message is received.

5 . The method of claim 4 , further sending a floor release request if the PoC button is associated with a non-pressed button status when the floor grant message is received.

6 . A method for push to talk over cellular (PoC) operation, comprising:

providing a PoC button associated with a cellular phone;

detecting the PoC button has been pressed a first time;

sending a floor grant request for establishing an outward voice communication after the PoC button has been pressed the first time;

detecting that the PoC button is kept on being pressed until a floor grant message is then received;

receiving a floor grant message;

detecting the PoC button has been released a first time after the floor grant message is received;

assigning the PoC button a pressed button status when the PoC button has been pressed and released the first time; and

establishing and maintaining the outward voice communication, wherein the PoC button is associated with the pressed button status.

7 . The method of claim 6 , further comprising detecting the PoC button has been pressed and released a second time after the outward voice communication has been established, and sending a floor release request.

8 . The method of claim 6 , further comprising after the outward voice communication has been established, determining a time length of a silent period, and sending a floor release request when the silent period exceeds a time limit.

9 . The method of claim 6 , further assigning the PoC button a non-pressed button status when the button is released the first time before the floor grant message is received.

10 . The method of claim 9 , further sending a floor release request if the PoC button is associated with the non-pressed button status when the floor grant is received.

11 . A cellular phone implementing push to talk over cellular (PoC) operation, comprising:

a PoC button;

a memory storing program code for implementing the PoC operation, and a PoC button status associated with the PoC button; and

a controller executing the program code, performing steps of:

detecting the PoC button has been pressed and released a first time, wherein the time length the PoC button has been pressed does not exceed a first time limit;

detecting the PoC button has been pressed and released a second time, wherein the time length the PoC button has been pressed the second time does not exceed the first time limit, wherein the time difference between the first and second times of releasing the PoC button does not exceed a second time limit;

assigning the PoC button a pressed button status when the PoC button has been pressed and then released the second time;

sending a floor grant request to establish an outward voice communication;

receiving a floor grant message; and

establishing and maintaining the outward voice communication, wherein the PoC button is associated with the pressed button status.

12 . The cellular phone of claim 11 , wherein the controller further detects the PoC button has been pressed and released a third time after the outward voice communication has been established, and sending a floor release request.

13 . The cellular phone of claim 12 , wherein the controller further determines a time length of a silent period after the outward voice communication has been established, and sending a floor release request when the silent period exceeds a third time limit.

14 . The cellular phone of claim 12 , wherein the controller further assigns the PoC button a non-pressed button status when the button is pressed and released a third time before the floor grant message is received.

15 . The cellular phone of claim 12 , wherein the controller further sends a floor release request if the PoC button is associated with a non-pressed button status when the floor grant message is received.

16 . A cellular phone implementing push to talk over cellular (PoC) operation, comprising:

a PoC button;

a memory storing program code for implementing the PoC operation, and a PoC button status associated with the PoC button; and

a controller executing the program code, performing steps of:

detecting the PoC button has been pressed a first time;

sending a floor grant request for establishing an outward voice communication after the PoC button has been pressed the first time;

detecting that the PoC button is kept on being pressed until a floor grant message is then received;

receiving a floor grant message;

detecting the PoC button has been released a first time after the floor grant message is received; assigning the PoC button a pressed button status when the PoC button has been pressed and released the first time; and

establishing and maintaining the outward voice communication wherein the PoC button is associated with the pressed button status.

17 . The cellular phone of claim 16 , wherein the controller further detects the PoC button has been pressed and released a second time after the outward voice communication has been established, and sending a floor release request.

18 . The cellular phone of claim 16 , wherein the controller further determines a time length of a silent period after the outward voice communication has been established, and sends a floor release request when the silent period exceeds a time limit.

19 . The cellular phone of claim 16 , wherein the controller further assigns the PoC button a non-pressed button status when the button is released the first time before the floor grant message is received.

20 . The cellular phone of claim 19 , wherein the controller further sends a floor release request if the PoC button is associated with the non-pressed button status when the floor grant is received.