Enhancement by aggressor victim relation
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for managing remote interference using a previously detected relationship between an aggressor base station and a victim base station. The described techniques provide for allocating reference signal sequences for various victim base stations to send to an aggressor base station. The victim base station may trigger the aggressor base station to perform reference signal monitoring based on the previously detected victim-aggressor relationship, and may transmit a reference signal carrying a unique identifier based on the triggering. The first base station may send a request that the second base station to transmit a reference signal for enabling the first base station to measure interference of a wireless channel, and performing interference mitigation techniques at the first base station, the second base station, or both, to mitigate the remote interference.
1. A method for wireless communication by a first base station operating in a time division duplex (TDD) system, comprising:
identifying that downlink transmissions from at least one other base station are causing interference to reception of uplink transmissions from a first user equipment (UE) served by the first base station; and
transmitting a first reference signal transmission based at least in part on at least one remote base station being triggered to perform reference signal monitoring due to a previously detected victim-aggressor relationship between the first base station and the at least one remote base station.
2. The method of claim 1 , further comprising:
detecting an identifier assigned to the at least one remote base station based at least in part on receiving a second reference signal transmission from the at least one remote base station.
3. The method of claim 2 , further comprising:
determining a relationship update for information related to the previously detected victim-aggressor relationship based at least in part on the detected identifier; and
updating a database record of the previously detected victim-aggressor relationship in a local database, a network controller database, or both, based at least in part on the relationship update.
4. The method of claim 3 , wherein updating the database record comprises:
sending report information associated with the detected reference signal to a network controller for updating the network controller database.
5. The method of claim 1 , further comprising:
receiving a second reference signal transmission that comprises an identifier of a second remote base station of the at least one remote base station;
classifying the second remote base station as having a first relation type to the first base station based at least in part on the identifier; and
classifying the first base station as having a second relation type to the second remote base station based at least in part on the identifier.
6. The method of claim 1 , further comprising:
receiving a second reference signal transmission that comprises an identifier of a second remote base station of the at least one remote base station, wherein the identifier is unique to the first remote base station.
7. The method of claim 1 , further comprising:
receiving a second reference signal transmission that comprises an identifier of a second remote base station of the at least one remote base station, wherein the identifier is shared by a plurality of remote base stations.
8. The method of claim 1 , further comprising:
monitoring an interference power level, an interference pattern, or both, of a second reference signal transmission of a second remote base station of the at least one remote base station; and
classifying the second remote base station as an aggressor based at least in part on the interference power level, the interference pattern, or both.
9. The method of claim 1 , wherein triggering the at least one remote base station to perform reference signal monitoring further comprises:
retrieving, from a database, an indication of the previously detected victim-aggressor relationship; and
transmitting, via wireless channel or a backhaul link, a request to the at least one remote base station based at least in part on an indication.
10. The method of claim 1 , wherein triggering the at least one remote base station to perform reference signal monitoring further comprises:
transmitting, via a backhaul link, a request to a network controller for identifying the at least one remote base station based at least in part on the previously detected victim-aggressor relationship and for instructing the at least one remote base station to perform reference signal monitoring.
11. The method of claim 1 , further comprising:
receiving, from the at least one remote base station, a relationship update indicating information related to the previously detected victim-aggressor relationship; and
updating a database record of the previously detected victim-aggressor relationship in a local database, a network controller database, or both, based at least in part on the relationship update.
12. The method of claim 1 , further comprising:
transmitting a reference signal request for triggering the at least one remote base station to transmit a second reference signal transmission.
13. The method of claim 12 , wherein transmitting the reference signal request further comprises:
retrieving, from a database, an indication of the previously detected victim-aggressor relationship; and
transmitting, via a wireless channel or a backhaul link, the reference signal request to the at least one remote base station based at least in part on the indication.
14. The method of claim 12 , wherein transmitting the reference signal request further comprises:
transmitting, via a backhaul link, the reference signal request to a network controller for identifying the at least one remote base station based at least in part on the previously detected victim-aggressor relationship and for instructing the at least one remote base station to transmit the second reference signal transmission.
15. The method of claim 12 , further comprising:
monitoring for the second reference signal transmission based at least in part on the reference signal request;
generating a measurement of an interference channel based at least in part on receiving the second reference signal transmission; and
transmitting, via a backhaul link, the measurement to the at least one remote base station.
16. The method of claim 1 , further comprising:
receiving a second reference signal transmission that comprises an identifier of a second remote base station of the at least one remote base station; and
classifying the second remote base station as an aggressor to the first remote base station based at least in part on the identifier.
17. The method of claim 16 , further comprising:
classifying the first base station as an aggressor to the second remote base station based at least in part on the identifier.
18. The method of claim 16 , wherein classifying the second remote base station further comprises:
classifying the second remote base station as an aggressor to the first remote base station based at least in part on the identifier and a downlink transmission power of the second remote base station satisfying a threshold.
19. The method of claim 16 , wherein classifying the second remote base station further comprises:
classifying the second remote base station as an aggressor to the first remote base station based at least in part on the identifier and a number of remote base stations associated with the identifier.
20. The method of claim 1 , wherein transmitting the first reference signal transmission further comprises:
receiving a reference sequence configuration from a network controller; and
transmitting the first reference signal transmission in accordance with the reference sequence configuration.
21. A method for wireless communication by a first base station operating in a time division duplex (TDD) system, comprising:
receiving a request to perform reference signaling monitoring based at least in part on a previously detected victim-aggressor relationship between the first base station and a second base station; and
monitoring for a first reference signal transmission from the second base station based at least in part on the request.
22. The method of claim 21 , further comprising:
transmitting a relationship update indicating information related to the previously detected victim-aggressor relationship; and
updating a database record related to the previously detected victim-aggressor relationship in a local database, a network controller database, or both, based at least in part on the relationship update.
23. The method of claim 21 , further comprising:
receiving, via a wireless channel or a backhaul link, a reference signal request for triggering the first base station to transmit a second reference signal transmission; and
transmitting the second reference signal transmission based at least in part on the reference signal request.
24. The method of claim 23 , wherein the second reference signal transmission comprises an identifier of the first base station.
25. The method of claim 21 , further comprising:
transmitting a second reference signal transmission that comprises an identifier of the first base station.
26. The method of claim 23 , wherein the identifier is unique to the first remote base station.
27. A method for wireless communication by a network controller operating in a time division duplex (TDD) system, comprising:
receiving, from a first base station, a request to trigger reference signal monitoring by at least one remote base station;
identifying a previously detected victim-aggressor relationship between the first base station and the at least one remote base station; and
transmitting a monitoring request instructing the at least one remote base station to perform reference signal monitoring.
28. The method of claim 27 , further comprising:
configuring the first base station with a first identifier for transmission in a first reference signal transmission; and
configuring the at least one remote base station with a second identifier for transmission in a second reference signal transmission.
29. The method of claim 27 , further comprising:
receiving, from the at least one remote base station or the first base station, a relationship update indicating information related to the previously detected victim-aggressor relationship; and
updating a database record related to the previously detected victim-aggressor relationship in a database based at least in part on the relationship update.
30. An apparatus for wireless communication by a first base station operating in a time division duplex (TDD) system, comprising:
a processor,
memory in electronic communication with the processor; and
instructions stored in the memory and executable by the processor to cause the apparatus to:
identify that downlink transmissions from at least one other base station are causing interference to reception of uplink transmissions from a first user equipment (UE) served by the first base station; and
transmit a first reference signal transmission based at least in part on at least one remote base station being triggered to perform reference signal monitoring due to a previously detected victim-aggressor relationship between the first base station and the at least one remote base station.