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

Abstract

A method of improving a high-speed downlink operation in CELL_FACH state for a network terminal of a wireless communications system includes using a first function but not using a second function when a user equipment, hereinafter called UE, initiates a cell update procedure. The network terminal wirelessly communicates with the UE, and the network terminal and the UE both support the high-speed downlink operation in CELL_FACH state. The first function is used for allocating a dedicated HS-DSCH radio network transaction identifier (H-RNTI) to the UE, so as to manage the UE to perform the high-speed downlink operation in CELL_FACH based on the dedicated H-RNTI. The second function is used for not allocating the dedicated H-RNTI to the UE.

1 . A method of improving a high-speed downlink operation in CELL_FACH state for a network terminal of a wireless communications system, the network terminal wirelessly communicating with a user equipment, hereinafter called UE, the network terminal and the UE both supporting the high-speed downlink operation in CELL_FACH state, the method comprising:
 using a first function but not using a second function when the UE initiates a cell update procedure due to cell reselection; and   wherein the first function is used for allocating a dedicated HS-DSCH radio network transaction identifier, hereinafter called H-RNTI, to the UE, 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.   
     
     
         2 . The method of  claim 1 , 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 a CELL UPDATE CONFIRM message; and   sending the CELL UPDATE CONFIRM message to the UE.   
     
     
         3 . The method of  claim 2  further comprising sending the CELL UPDATE CONFIRM message on a common control channel, abbreviated to CCCH. 
     
     
         4 . The method of  claim 2 , wherein the second function comprises not including the New H-RNTI IE in the CELL UPDATE CONFIRM message. 
     
     
         5 . The method of  claim 1 , wherein the high-speed downlink operation comprises a high speed downlink shared channel, known as HS-DSCH, reception operation. 
     
     
         6 . 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 cell update procedure due to cell reselection; and 
 wherein the first function is used for allocating a dedicated HS-DSCH radio network transaction identifier, hereinafter called H-RNTI, to the UE, 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. 
   
     
     
         7 . The communications device of  claim 6 , 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 a CELL UPDATE CONFIRM message; and   sending the CELL UPDATE CONFIRM message to the UE.   
     
     
         8 . The communications device of  claim 7 , wherein the program code further comprises sending the CELL UPDATE CONFIRM message on a common control channel, abbreviated to CCCH. 
     
     
         9 . The communications device of  claim 7 , wherein the second function comprises not including the New H-RNTI IE in the CELL UPDATE CONFIRM message. 
     
     
         10 . The communications device of  claim 6 , wherein the high-speed downlink operation comprises a high speed downlink shared channel, known as HS-DSCH, reception operation.