US2014295860A1PendingUtilityA1

Method and apparatus for monitoring a radio link on a small cell in a wireless communication system

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Assignee: INNOVATIVE SONIC CORPPriority: Apr 1, 2013Filed: Mar 27, 2014Published: Oct 2, 2014
Est. expiryApr 1, 2033(~6.7 yrs left)· nominal 20-yr term from priority
Inventors:Richard Lee-Chee Kuo
H04W 36/00H04W 84/045H04W 76/34H04W 24/04H04W 24/02H04W 72/04H04W 36/0069H04W 28/0278H04W 16/32H04W 72/21
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Claims

Abstract

A method and apparatus are disclosed for monitoring a radio link on a small cell in a wireless communication system. The method includes the UE receives a RRC message for configuring a second cell to the UE. The method also includes the UE transmits a complete message in response to the RRC message for configuring the second cell. The method further includes the UE monitors a radio link with the second cell and reports a radio link failure to the first eNB when the radio link failure is detected on the second cell, if the second cell is controlled by a second eNB. In one embodiment, the method includes (i) the UE stops uplink transmission(s) to the second cell after detection of the radio link failure, and/or (ii) the UE deactivates the second cell after detection of the radio link failure.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A method for monitoring a radio link on a small cell in a wireless communication system, wherein a UE (User Equipment) is served by a first cell controlled by a first eNB (evolved Node B), comprising:
 the UE receives a RRC (Radio Resource Control) message for configuring a second cell to the UE;   the UE transmits a complete message in response to the RRC message for configuring the second cell; and   the UE monitors a radio link with the second cell and reports a radio link failure to the first eNB when the radio link failure is detected on the second cell, if the second cell is controlled by a second eNB.   
     
     
         2 . The method of  claim 1 , wherein the UE does not monitor the radio link with the second cell and does not report the radio link failure to the first eNB if the second cell is controlled by the first eNB. 
     
     
         3 . The method of  claim 1 , further comprising:
 the UE stops uplink transmission(s) to the second cell after detection of the radio link failure.   
     
     
         4 . The method of  claim 1 , further comprising:
 the UE deactivates the second cell after detection of the radio link failure.   
     
     
         5 . The method of  claim 1 , wherein the radio link failure is detected based on “out-of-sync” and “in-sync” indications from a physical layer and a timer, or is detected due to a random access problem on the second cell. 
     
     
         6 . The method of  claim 1 , wherein the radio link failure is reported via a RRC signaling or an MAC (Medium Access Control) signaling. 
     
     
         7 . The method of  claim 1 , wherein the RRC message for configuring the second cell to the UE is an RRC Connection Reconfiguration message received from the first eNB. 
     
     
         8 . A method for monitoring a radio link on a small cell in a wireless communication system, wherein a UE (User Equipment) is served by a first cell controlled by a first eNB (evolved Node B), comprising:
 the first eNB transmits a RRC (Radio Resource Control) message for configuring a second cell to the UE;   the first eNB receives a complete message from the UE in response to the RRC message for configuring the second cell; and   the first eNB receives a radio link failure report on the second cell from the UE if the second cell is controlled by a second eNB.   
     
     
         9 . The method of  claim 8 , wherein the first eNB does not receive the radio link failure report on the second cell from the UE if the second cell is controlled by the first eNB. 
     
     
         10 . The method of  claim 8 , further comprising:
 the first eNB transmits another RRC message to the UE to remove the second cell after reception of the radio link failure report.   
     
     
         11 . The method of  claim 8 , wherein the radio link failure is detected based on “out-of-sync” and “in-sync” indications from a physical layer and a timer, or is detected due to a random access problem on the second cell. 
     
     
         12 . The method of  claim 8 , wherein the radio link failure is reported via a RRC signaling or an MAC (Medium Access Control) signaling. 
     
     
         13 . The method of  claim 8 , wherein the RRC message for configuring the second cell to the UE is an RRC Connection Reconfiguration message. 
     
     
         14 . A communication device for monitoring a radio link on a small cell in a wireless communication system, wherein a UE (User Equipment) is served by a first cell controlled by a first eNB (evolved Node B), the communication device comprising:
 a control circuit;   a processor installed in the control circuit;   a memory installed in the control circuit and operatively coupled to the processor;   wherein the processor is configured to execute a program code stored in memory to enable the UE to:
 receive a RRC (Radio Resource Control) message for configuring a second cell to the UE; 
 transmit a complete message in response to the RRC message for configuring the second cell; and 
 monitor a radio link with the second cell and reports a radio link failure to the first eNB when the radio link failure is detected on the second cell, if the second cell is controlled by a second eNB. 
   
     
     
         15 . The communication device of  claim 14 , wherein the UE does not monitor the radio link with the second cell and does not report the radio link failure to the first eNB if the second cell is controlled by the first eNB. 
     
     
         16 . The communication device of  claim 14 , wherein the processor is further configured to execute a program code stored in memory to enable the UE to stop uplink transmission(s) to the second cell after detection of the radio link failure. 
     
     
         17 . The communication device of  claim 14 , wherein the processor is further configured to execute a program code stored in memory to enable the UE to deactivate the second cell after detection of the radio link failure. 
     
     
         18 . The communication device of  claim 14 , wherein the radio link failure is detected based on “out-of-sync” and “in-sync” indications from a physical layer and a timer, or is detected due to a random access problem on the second cell. 
     
     
         19 . The communication device of  claim 14 , wherein the radio link failure is reported via a RRC signaling or an MAC (Medium Access Control) signaling. 
     
     
         20 . The communication device of  claim 14 , wherein the RRC message for configuring the second cell to the UE is an RRC Connection Reconfiguration message received from the first eNB.

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