Blockage detection in millimeter wave radio communications

1. A method of blockage detection in a wireless transmit receive unit (WTRU), the method comprising:

performing a radio link measurement on one or more reference signals;

comparing the radio link measurement to a comparing threshold;

indicating a blockage condition in response to the comparing of the radio link measurement meeting a threshold criterion on the comparing threshold;

sending a blockage report to a network core in response to the comparing of the radio link measurement meeting the threshold criterion;

starting a timer when a first blockage condition is satisfied; and

determining the blockage if the blockage condition is still satisfied after timer expiry.

2. The method of claim 1 , wherein the reference signals are associated to a serving beam or a candidate beam.

3. The method of claim 1 , wherein the comparing threshold is determined by a latest radio link measurement and a historical radio link measurement.

4. The method of claim 1 , wherein the comparing threshold is configured at a network core.

5. The method of claim 1 , wherein the radio link measurement is to measure one or more of the group comprising reference signal received power (RSRP), reference signal received quality (RSRQ), received signal strength indicator (RSSI), signal to interference plus noise (SINR), block error rate (BLER) and channel quality indicator (CQI).

6. The method of claim 1 wherein the blockage condition is met when either the radio link measurement is above the comparing threshold or the radio link measurement is above the comparing threshold for a predetermined time period.

7. The method of claim 6 , wherein the time period is controlled by a timer or a counter, and the values are configured at a network core.

8. The method of claim 1 , further comprising selecting the transmission path in which to send the blockage report from dual connectivity or carrier aggregation.

9. An apparatus comprising:

radio circuitry by which wireless electromagnetic radio signals are conveyed to and from one or more radio nodes; and

processor circuitry configured to:

perform a radio link measurement on one or more reference signals;

compare the radio link measurement to a comparing threshold;

indicating a blockage condition in response to the comparing of the radio link measurement meeting a threshold criterion;

start a timer when a first blockage condition is satisfied; and

determine the blockage if the blockage condition is still satisfied after timer expiry.

10. The apparatus of claim 9 , wherein the blockage condition is met when either the radio link measurement is above the comparing threshold or the radio link measurement is above the comparing threshold for a predetermined time period.

11. The apparatus of claim 9 , wherein the processor is further configured to send a blockage report to a network core in response to the comparing of the radio link measurement meeting the threshold criterion.