RADIO LINK FAILURE DETECTION PROCEDURES IN LONG TERM EVOLUTION UPLINK AND DOWNLINK AND APPARATUS THEREFOR
A method and apparatus for detecting a radio link (RL) failure for uplink (UL) and downlink (DL) in a long term evolution (LTE) wireless communication system including at least one wireless transmit/receive unit (WTRU) and at least one evolved Node-B (eNodeB) are disclosed. A determination is made as to whether an RL has an in-synchronization status or an out-of-synchronization status. An RL failure is declared if an out-of-synchronization status is detected.
1 . A method, implemented by a wireless transmit/receive unit (WTRU), of determining a radio link (RL) synchronization status, the method comprising:
determining a quality of a downlink (DL) common shared control physical channel communicated in a channel structure corresponding to a long-term evolution (LTE) compatible network;
comparing the quality to a predetermined threshold; and
determining the RL synchronization status, based at least in part, on the comparison.
2 . The method of claim 1 , wherein the quality is based, at least in part, on a period of time.
3 . The method of claim 1 , wherein the RL synchronization status is determined to be out-of-synchronization upon the comparison indicating an out-of-synchronization condition.
4 . The method of claim 1 wherein the quality of the downlink (DL) common shared control physical channel is monitored on at least one of a continuous basis or a periodic basis.
5 . The method of claim 3 , further comprising
indicating the out-of-synchronization status to at least one logical layer in communication with a physical layer.
6 . The method of claim 5 further comprising:
transmitting a channel quality indicator (CQI) based on at least one of a measurement or estimation of at least one DL reference channel received by the WTRU.
7 . The method of claim 5 further comprising:
receiving a channel quality indicator (CQI) based on at least one of a measurement or estimation of at least one uplink (UL) reference channel.
8 . A wireless transmit/receive unit (WTRU configured to:
determine a quality of downlink (DL) common shared control physical channel communicated in a channel structure corresponding to a long-term evolution (LTE) compatible network;
compare the quality to a predetermined threshold; and
determine an RL synchronization status, based at least in part, on the comparison.
9 . The WTRU of claim 8 wherein the WTRU is configured to transmit a channel quality indicator (CQI) based on at least one of a measurement or estimation of at least one downlink (DL) reference channel received by the WTRU.
10 . The WTRU of claim 8 wherein the RL synchronization status is determined to be out-of-synchronization upon the comparison indicating an out-of-synchronization condition.
11 . The WTRU of claim 8 wherein the quality is monitored on at least one of a continuous or periodic basis.
12 . The WTRU of claim 10 further configured to indicate that the out-of-synchronization status has been detected to a logical layer in communication with a physical layer.
13 . The WTRU of claim 12 , wherein the WTRU is configured to transmit a channel quality indicator (CQI) based on at least one of a measurement or estimation of at least one DL reference channel received by the WTRU.
14 . The WTRU of claim 12 wherein the WTRU is configured to receive a channel quality indicator (CQI) based on at least one of a measurement or estimation of at least one uplink (UL) reference channel.
15 . The WTRU of claim 8 wherein the quality is based, at least in part, on a period of time.