Identifying transient blockage
Apparatuses and methods in a communication system for identifying transient blockage are presented. Transmission to one or more RAN nodes of parameters for the one or more RAN node is controlled to detect occurrences of sharp channel degradation events in connections served by the node. Data is received from the one or more RAN nodes, the data being related to channel or transmission events related to detected sharp channel degradation in connections served by the node. Based on the received data, likelihood is determined that one or more RAN nodes have a high level of transient blockages.
1. An apparatus, comprising:
at least one processor; and
at least one non-transitory memory including computer program code comprising instructions, where the instructions, when executed by the at least one processor, are configured to cause the apparatus to:
control reception of parameters for the apparatus to detect occurrences of sharp channel degradation events in connections served by the apparatus within a cell;
detect, within the cell, one or more occurrences of sharp channel degradation events using the received parameters;
gather, within the cell, data on channel or transmission events corresponding to the one or more detected sharp channel degradation events;
control, within the cell, transmission of data on the channel or transmission events related to detected sharp channel degradation in connections served by the apparatus;
wherein detecting the one or more occurrences of sharp channel degradation events includes at least two of the following:
use a time duration T for measurements, where T is a part of the parameters;
determine that the number of steps by which modulation and coding scheme was reduced within the time duration T exceeds a number N 1 , where N 1 is a part of the parameters;
determine that a length of a sequence of consecutive discontinuous transmissions exceeds a value N 2 , where N 2 is a part of the parameters;
determine that a length of a sequence of consecutive negative feedback transmissions exceeds a value N 3 , where N 3 is a part of the parameters;
determine that a fraction of negative feedback transmissions to total number of feedback transmissions exceeds a value F 1 within the time duration T, where F 1 is a part of the parameters;
determine that a fraction of uplink discontinuous transmissions on uplink control channel to total number of transmissions within the time duration T exceeds a value F 2 , where F 2 is a part of the parameters;
determine a minimum modulation and coding scheme of user terminal before occurrence of sharp channel degradation;
determine a sequence of channel-related or radio-related or radio-resource-management-related measurements before and during the occurrence of sharp channel degradation;
determine a minimum signal level for user equipment before occurrence of sharp channel degradation; and
for each event E reported for user equipment in a communication system:
determine a maximum duration of time T 2 between events E 1 and E 2 , where:
E 1 is an event where the user equipment reports a second beam as its strongest beam where the second beam is not a neighboring beam of a previous strongest first beam, with the signal level of the second beam being significantly less than the first beam, and
E 2 is an event where the user equipment reports a third beam as its strongest beam where the third beam is a neighboring beam of the first beam, with the signal level of the third beam being significantly better than the signal level of the second beam, and where T 2 , E 1 and E 2 are part of the parameters.
2. The apparatus of claim 1 , wherein the data on channel or transmission events related to sharp channel degradation comprises at least one of:
data on channel or transmission events prior to the channel degradation event occurrence;
data on channel or transmission events during the channel degradation event occurrence; or
data on channel or transmission events after the channel degradation event occurrence.
3. The apparatus of claim 1 , wherein the data on channel or transmission events related to detected sharp channel degradation in connections comprise one or more of the following:
a list of entries, each corresponding to an occurrence where a modulation and coding scheme of user terminal was reduced by more than N 1 steps within the time duration;
a list of entries, each corresponding to an occurrence where for a user equipment, there was a sequence of consecutive discontinuous transmissions of length at least N 2 ;
a list of entries, each corresponding to an occurrence where for a user equipment, there was a sequence of consecutive of hybrid automatic repeat request negative feedbacks of length at least N 3 ; or
a list of entries, each corresponding to an occurrence where for a user equipment, beam switch events E 1 and E 2 happened within a time T 2 .
4. The apparatus of claim 1 , wherein the data related to channel, or transmission events related to detected sharp channel degradation in connections comprise one or more of the following:
a sequence of one or more signal levels prior to, during or after each corresponding occurrence;
sequence of one or more modulation and coding schemes used for transmission to or from the user terminal and/or channel quality index prior, during or after each occurrence; or
an indication whether the connection was dropped after the occurrence.
5. The apparatus of claim 1 , wherein the data on channel or transmission events related to detected sharp channel degradation in connections comprise one or more of the following:
a RAN-level user equipment identifier for an associated UE user equipment.
6. A method in an apparatus in a communication system, the method comprising:
controlling reception of parameters for the apparatus to detect occurrences of sharp channel degradation events in connections served by the apparatus within a cell;
detecting, within the cell, one or more occurrences of sharp channel degradation events using the received parameters;
gathering, within the cell, data on channel or transmission events corresponding to the one or more detected sharp channel degradation events;
controlling, within the cell, transmission of data on the channel or transmission events related to detected sharp channel degradation in connections served by the apparatus;
wherein detecting the one or more occurrences of sharp channel degradation events includes at least two of the following:
use a time duration T for measurements, where T is a part of the parameters;
determining that the number of steps by which modulation and coding scheme was reduced within the time duration T exceeds a number N 1 , where N 1 is a part of the parameters;
determining that a length of a sequence of consecutive discontinuous transmissions exceeds a value N 2 , where N 2 is a part of the parameters;
determining that a length of a sequence of consecutive negative feedback transmissions exceeds a value N 3 , where N 3 is a part of the parameters;
determining that a fraction of negative feedback transmissions to total number of feedback transmissions exceeds a value F 1 within the time duration T, where F 1 is a part of the parameters;
determining that a fraction of uplink discontinuous transmissions on uplink control channel to total number of transmissions within the time duration T exceeds a value F 2 , where F 2 is a part of the parameters;
determining a minimum modulation and coding scheme of user terminal before occurrence of sharp channel degradation;
determining a sequence of channel-related or radio-related or radio-resource-management-related measurements before and during the occurrence of sharp channel degradation;
determining a minimum signal level for user equipment before occurrence of sharp channel degradation; and
for each event E reported for user equipment in a communication system:
determining a maximum duration of time T 2 between beam switch events E 1 and E 2 , where:
E 1 is an event where the user equipment reports a second beam as its strongest beam where the second beam is not a neighboring beam of a previous strongest first beam, with the signal level of the second beam being significantly less than the first beam, and
E 2 is an event where the user equipment reports a third beam as its strongest beam where the third beam is a neighboring beam of the first beam, with the signal level of the third beam being significantly better than the signal level of the second beam, and where T 2 , E 1 and E 2 are part of the parameters.
7. The method of claim 6 , wherein the data on channel or transmission events related to sharp channel degradation comprises at least one of:
data on channel or transmission events prior to the channel degradation event occurrence;
data on channel or transmission events during the channel degradation event occurrence; or
data on channel or transmission events after the channel degradation event occurrence.
8. The method of claim 6 , wherein the data on channel or transmission events related to detected sharp channel degradation in connections comprise one or more of the following:
a list of entries, each corresponding to an occurrence where a modulation and coding scheme of user terminal was reduced by more than N 1 steps within the time duration;
a list of entries, each corresponding to an occurrence where for a user equipment, there was a sequence of consecutive discontinuous transmissions of length at least N 2 ;
a list of entries, each corresponding to an occurrence where for a user equipment, there was a sequence of consecutive of hybrid automatic repeat request negative feedbacks of length at least N 3 ; or
a list of entries, each corresponding to an occurrence where for a user equipment, said beam switch events E 1 and E 2 happened within a time T 2 .
9. The method of claim 6 , wherein the data related to channel or transmission events related to detected sharp channel degradation in connections comprise one or more of the following:
a sequence of one or more signal levels prior to, during or after each corresponding occurrence;
sequence of one or more modulation and coding schemes used for transmission to or from the user terminal and/or channel quality index prior, during or after each occurrence; or
an indication whether the connection was dropped after the occurrence.
10. The method of claim 6 , wherein the data on channel or transmission events related to detected sharp channel degradation in connections comprise one or more of the following:
a RAN-level user equipment identifier for an associated user equipment.
11. A non-transitory computer readable medium comprising instructions for causing an apparatus to at least perform:
controlling reception of parameters for the apparatus to detect occurrences of sharp channel degradation events in connections served by the apparatus within a cell;
detecting, within the cell, one or more occurrences of sharp channel degradation events using the received parameters;
gathering, within the cell, data on channel or transmission events corresponding to the one or more detected sharp channel degradation events;
controlling, within the cell, transmission of data on the channel or transmission events related to detected sharp channel degradation in connections served by the apparatus;
wherein detecting the one or more occurrences of sharp channel degradation events includes at least two of the following:
use a time duration T for measurements, where T is a part of the parameters;
determining that the number of steps by which modulation and coding scheme was reduced within the time duration T exceeds a number N 1 , where N 1 is a part of the parameters;
determining that a length of a sequence of consecutive discontinuous transmissions exceeds a value N 2 , where N 2 is a part of the parameters;
determining that a length of a sequence of consecutive negative feedback transmissions exceeds a value N 3 , where N 3 is a part of the parameters;
determining that a fraction of negative feedback transmissions to total number of feedback transmissions exceeds a value F 1 within the time duration T, where F 1 is a part of the parameters;
determining that a fraction of uplink discontinuous transmissions on uplink control channel to total number of transmissions within the time duration T exceeds a value F 2 , where F 2 is a part of the parameters;
determining a minimum modulation and coding scheme of user terminal before occurrence of sharp channel degradation;
determining a sequence of channel-related or radio-related or radio-resource-management-related measurements before and during the occurrence of sharp channel degradation;
determining a minimum signal level for user equipment before occurrence of sharp channel degradation; and
for each event E reported for user equipment in a communication system:
determining a maximum duration of time T 2 between events E 1 and E 2 , where:
E 1 is an event where the user equipment reports a second beam as its strongest beam where the second beam is not a neighboring beam of a previous strongest first beam, with the signal level of the second beam being significantly less than the first beam, and
E 2 is an event where the user equipment reports a third beam as its strongest beam where the third beam is a neighboring beam of the first beam, with the signal level of the third beam being significantly better than the signal level of the second beam, and where T 2 , E 1 and E 2 are part of the parameters.