Radio link control reset using radio resource control signaling

Abstract

A method and apparatus are disclosed wherein a reset procedure for a RLC is implemented by RRC signaling. Triggers for the initiation and execution of the disclosed reset method are also disclosed.

1 . A method implemented by a wireless transmit/receive unit (WTRU) for resetting a base station radio link control entity, comprising:
 detecting a number of retransmissions exceeding a maximum number of allowed retransmissions as an indication of radio link failure; and   sending from a radio resource control entity a radio resource control message to a base station, which includes a radio link control reset request.   
   
   
       2 . The method according to  claim 1 , wherein the radio link control reset request includes an information element that identifies a radio link entity requesting radio link control reset request. 
   
   
       3 . The method according to  claim 1 , wherein the radio link control reset request includes an information element that identifies a radio link entity to be reset. 
   
   
       4 . The method according to  claim 1 , wherein the radio link control reset request includes an information element that identifies a reset sequence number that indicates whether the radio link control reset request is a first request or a request retransmission. 
   
   
       5 . The method according to  claim 1 , wherein the radio link control reset request includes an information element that identifies a cause for the radio link reset request. 
   
   
       6 . The method according to  claim 1 , wherein the radio link control reset request includes an information element that identifies configuration parameters for the radio link control reset. 
   
   
       7 . A method implemented by a wireless transmit/receive unit (WTRU) for resetting a radio link control (RLC) entity, comprising:
 receiving a request for a RLC reset in a radio resource control message;   reassembling RLC service data units (SDUs) from any protocol data units (PDUs) that are received out of sequence at a receiving side of the RLC entity;   discarding at the receiving side of the RLC entity any remaining PDUs that are not able to be reassembled;   discarding at a transmitting side of the RLC entity all SDUs and PDUs stored in transmit buffers;   stopping and resetting all timers associated with the RLC entity; and   resetting all state variables associated with the RLC entity to initial values.   
   
   
       8 . The method according to  claim 7 , further comprising sending a RLC reset acknowledgment. 
   
   
       9 . The method according to  claim 7 , wherein the radio link control entity is an acknowledgment mode type of radio link control entity. 
   
   
       10 . A wireless transmit/receive unit (WTRU), comprising:
 a processor comprising:
 a radio link control entity configured to detect a number of retransmissions exceeding a maximum number of allowed retransmissions as an indication of radio link failure; and 
 a radio resource control entity configured to send a radio link control reset request message to a base station, the message triggered by a radio link control reset indication received from the radio link control entity. 
   
   
   
       11 . The WTRU according to  claim 10 , wherein the radio resource control entity is further configured to define an information element (IE) that identifies a radio link entity requesting radio link control reset request, and the radio link control reset request message contains the IE. 
   
   
       12 . The WTRU according to  claim 10 , wherein the radio resource control entity is further configured to define an information element (IE) that identifies a radio link entity to be reset, and the radio link control reset request message contains the IE. 
   
   
       13 . The WTRU according to  claim 10 , wherein the radio resource control entity is further configured to define an information element (IE) that identifies a reset sequence number that indicates whether the radio link control reset request is a first request or a request retransmission, and the radio link control reset request message contains the IE. 
   
   
       14 . The WTRU according to  claim 10 , wherein the radio resource control entity is further configured to define an information element (IE) that identifies a cause for the radio link reset request, and the radio link control reset request message contains the IE. 
   
   
       15 . The WTRU according to  claim 10 , wherein the radio resource control entity is further configured to define an information element (IE) that identifies configuration parameters for the radio link control reset, and the radio link control reset request message contains the IE. 
   
   
       16 . A wireless transmit/receive unit (WTRU), comprising:
 a processor comprising:   a radio resource control entity configured to receive a request for a radio link control reset in a radio resource control message; and   a radio link control entity configured to reassemble radio link control service data units (SDUs) from any protocol data units (PDUs) that are received out of sequence at a receiving side of the RLC entity; to deliver reassembled SDUs in sequence to a packet data convergence protocol entity; to discard at the receiving side of the radio link control entity any remaining PDUs that are not able to be reassembled; to discard at a transmitting side of the radio link control entity all SDUs and PDUs stored in transmit buffers; to stop and reset all timers associated with the radio link control entity; and to reset all state variables associated with the radio link control entity to initial values.   
   
   
       17 . The WTRU according to  claim 16 , wherein the radio resource control entity is further configured to send a radio link control reset acknowledgment for acknowledging the received radio link control reset request. 
   
   
       18 . The WTRU according to  claim 16 , wherein the radio resource control entity is further configured to send a radio link control reset acknowledgment upon the radio link control entity having completed a reset as according to the received reset request. 
   
   
       19 . The WTRU according to  claim 16 , wherein the radio link control entity is an acknowledgment mode type of radio link control entity.