Method for improving high-speed downlink operation in CELL—FACH state for a wireless communications system and related apparatus

A communications device used in a wireless communications system for improving a high-speed downlink operation in CELL_FACH state to prevent a user equipment, hereinafter called UE, from failing in reception of downlink packets, the communications device wirelessly communicating with the UE, the communications device and the UE both supporting the high-speed downlink operation in CELL_FACH state, the communications device comprising:

• a control circuit for realizing functions of the communications device;
• a central processing unit coupled to the control circuit for executing a program code to operate the control circuit;
• and
• a memory coupled to the central processing unit for storing the program code;
• wherein the program code comprises:
• using a first function but not using a second function when the UE initiates a radio resource control establishment procedure, wherein the first function is used for allocating a dedicated HS-DSCH radio network transaction identifier, hereinafter called H-RNTI, to the UE during a radio resource control (RRC) establishment procedure, so as to manage the UE to perform the high-speed downlink operation in CELL_FACH based on the dedicated H-RNTI, and the second function is used for not allocating the dedicated H-RNTI to the UE;
• wherein the first function comprises:
• setting a New H-RNTI information element, hereinafter called IE, with the dedicated H-RNTI;
• including the New H-RNTI IE in an RRC CONNECTION SETUP message;
• and
• sending the RRC CONNECTION SETUP message to the UE.

A method of improving a high-speed downlink operation in CELL_FACH state for a user equipment, hereinafter called UE, of a wireless communications system, the UE wirelessly communicating with a network terminal, the network terminal and the UE both supporting the high-speed downlink operation in CELL_FACH state, the method comprising:

• initiating a radio resource control, hereinafter called RRC, establishment procedure;
• receiving an RRC CONNECTION SETUP message from the network terminal;
• performing the high-speed downlink operation according, to a dedicated HS-DSCH radio network transaction identifier, hereinafter called H-RNTI, when the RRC CONNECTION SETUP message comprises the dedicated H-RNTI;
• and
• determining the RRC CONNECTION SETUP message to be invalid when the RRC CONNECTION SETUP message does not comprise the dedicated H-RNTI;
• wherein performing the high-speed downlink operation according to the dedicated H-RNTI when the RRC CONNECTION SETUP message comprises the dedicated H-RNTI is performing the high-speed downlink operation according to the dedicated H-RNTI when the RRC CONNECTION SETUP message comprises a New H-RNTI information element, hereinafter called IE, and determining the RRC CONNECTION SETUP message to be invalid when the RRC CONNECTION SETUP message does not comprise the dedicated H-RNTI is determining the RRC CONNECTION SETUP message to be invalid when the RRC CONNECTION SETUP message does not comprise the New H-RNTI IE, where the New H-RNTI IE is used for carrying settings corresponding to the dedicated H-RNTI.

A communications device used in a wireless communications system for improving a high-speed downlink operation in CELLFACH state to prevent from failing in reception of downlink packets, the communications device wirelessly communicating with a network terminal, the communications device and the network terminal both supporting the high-speed downlink operation in CELL_FACH state, the communications device comprising:

• a control circuit for realizing functions of the communications device;
• a central processing unit coupled to the control circuit for executing a program code to operate the control circuit;
• and
• a memory coupled to the central processing unit for storing the program code;
• wherein the program code comprises:
• initiating a radio resource control, hereinafter called RRC, establishment procedure;
• receiving an RRC CONNECTION SETUP message from the network terminal;
• performing the high-speed downlink operation according to a dedicated HS-DSCH radio network transaction identifier, hereinafter called H-RNTI, when the RRC CONNECTION SETUP message comprises the dedicated H-RNTI;
• and
• determining the RRC CONNECTION SETUP message to be invalid when the RRC CONNECTION SETUP message does not comprise the dedicated H-RNTI;
• wherein performing the high-speed downlink operation according to the dedicated H-RNTI when the RRC CONNECTION SETUP message comprises the dedicated H-RNTI is performing the high-speed downlink operation according to the dedicated H-RNTI when the RRC CONNECTION SETUP message comprises a New H-RNTI information element, hereinafter called IE, and determining the RRC CONNECTION SETUP message to be invalid when the RRC CONNECTION SETUP message does not comprise the dedicated H-RNTI is determining the RRC CONNECTION SETUP message to be invalid when the RRC CONNECTION SETUP message does not comprise the New H-RNTI IE, where the New H-RNTI IE is used for carrying settings corresponding to the dedicated H-RNTI.