Abstract
Techniques for mitigating interference in a wireless communication network are described. A terminal may desire to communicate with a weaker serving base station and may observe high interference from a strong interfering base station. The two base stations may be asynchronous and have different frame timing. In an aspect, high interference may be mitigated by having the interfering base station reserve downlink and/or uplink resources. The interfering base station may transmit at a low power level or not at all on the reserved downlink resources to reduce interference to the terminal. Terminals served by the interfering base station may transmit at a low power level or not at all on the reserved uplink resources to reduce interference at the serving base station. The terminal may then be able to communicate with the serving base station.
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Technologies
Product
Use Cases
Services
Claim
1. A method for wireless communication at a terminal, comprising:
detecting, by the terminal, an interfering base station causing interference to the terminal based, at least in part, on transmissions from the interfering base station;
sending, by the terminal, a request to reserve, for a predetermined time period, time frequency resources based on detecting the interfering base station; and
communicating, by the terminal, with a serving base station during the predetermined time period and on the time frequency resources reserved by the interfering base station based at least in part on the request and a predetermined order for reserving resources, wherein the interfering base station limits transmission on the reserved time frequency resources during the predetermined time period to reduce interference.
2. The method of claim 1, wherein sending the request comprises transmitting a pilot report, and
wherein the reserved time frequency resources are determined based on the report.
3. The method of claim 1, wherein the reserved time frequency resources comprise at least one subband, or at least one carrier, or a set of subcarriers.
4. The method of claim 1, wherein the interfering base station and the serving base station are asynchronous and have different frame timing.
5. The method of claim 1, wherein the communicating with the serving base station comprises receiving at least one of a control channel and a data channel sent exclusively on the reserved time frequency resources by the serving base station.
6. The method of claim 1, wherein the reserved time frequency resources comprise reserved downlink resources and reserved uplink resources, and wherein the communicating with the serving base station comprises
receiving at least one of a downlink control channel and a downlink data channel on the reserved downlink resources from the serving base station, and
sending at least one of an uplink control channel and an uplink data channel on the reserved uplink resources to the serving base station.
7. The method of claim 1, further comprising:
receiving at least one of a control channel and a data channel from the serving base station during N subframes of the serving base station, where N is one or greater, and wherein the reserved time frequency resources comprise at least N subframes of the interfering base station covering the N subframes of the serving base station.
8. The method of claim 1, further comprising:
determining channel information for the reserved time frequency resources; and
sending the channel information to the serving base station.
9. The method of claim 8, wherein the determining channel information comprises:
obtaining at least one signal-to-noise-and-interference ratio (SINR) estimate for the reserved time frequency resources, and
determining channel quality indicator (CQI) information based on the at least one SINR estimate, and wherein the channel information comprises the CQI information.
10. The method of claim 8, wherein the determining channel information comprises obtaining at least one interference estimate for the reserved time frequency resources, and wherein the channel information comprises the at least one interference estimate.
11. The method of claim 1, wherein received power of the serving base station is weaker than received power of the interfering base station at the terminal, and wherein pathloss from the serving base station to the terminal is smaller than pathloss from the interfering base station to the terminal.
12. The method of claim 1, wherein the interfering base station is a macro base station having a high transmit power level, and wherein the serving base station is a pico base station or a femto base station having a low transmit power level.
13. The method of claim 1, wherein the interfering base station is a femto base station with restricted access, and wherein the serving base station is a pico base station or a macro base station with unrestricted access.
14. The method of claim 1, further comprising:
detecting at least one of the serving base station and the interfering base station based on a low reuse preamble sent by each base station.
15. An apparatus for wireless communication, comprising:
means for detecting, by a terminal, an interfering base station causing interference to the terminal based, at least in part, on transmissions from the interfering base station;
means for sending, by the terminal, a request to reserve, for a predetermined time period, time frequency resources based on detecting the interfering base station; and
means for communicating, by the terminal, with a serving base station during the predetermined time period on the time frequency resources reserved by the interfering base station, wherein the reserved time frequency resources are reserved by the interfering base station based at least in part on the request and a predetermined order for reserving resources, and the interfering base station limits transmission on the reserved time frequency resources to reduce interference.
16. The apparatus of claim 15, wherein the means for communicating with the serving base station comprises means for receiving at least one of a control channel and a data channel sent exclusively on the reserved time frequency resources by the serving base station.
17. The apparatus of claim 15, further comprising:
means for determining channel information for the reserved time frequency resources; and
means for sending the channel information to the serving base station.
18. An apparatus for wireless communication, comprising:
at least one processor configured to detect, by a terminal, an interfering base station causing interference to the terminal, to send, by the terminal, a request to reserve, for a predetermined time period, time frequency resources based on detecting the interfering base station, and to communicate, by the terminal, with a serving base station during the predetermined time period and on the time frequency resources reserved by the interfering base station, wherein the reserved time frequency resources are reserved by the interfering base station based at least in part on the request and a predetermined order for reserving resources, wherein the interfering base station limits transmission on the reserved time frequency resources to reduce interference.
19. The apparatus of claim 18, wherein the at least one processor is configured to receive at least one of a control channel and a data channel sent exclusively on the reserved time frequency resources by the serving base station.
20. The apparatus of claim 18, wherein the at least one processor is configured to determine channel information for the reserved time frequency resources, and to send the channel information to the serving base station.
21. A non-transitory computer-readable medium comprising:
code for causing at least one computer to detect, by a terminal, an interfering base station causing interference to the terminal;
code for causing the at least one computer to send, by the terminal, a request to reserve, for a predetermined time period, time frequency resources based on detecting the interfering base station; and
code for causing the at least one computer to communicate, by the terminal, with a serving base station during the predetermined time period and on the time frequency resources reserved by the interfering base station, wherein the reserved time frequency resources are reserved by the interfering base station based at least in part on the request and a predetermined order for reserving resources, wherein the interfering base station limits transmission on the reserved time frequency resources to reduce interference.
22. A method for wireless communication, comprising:
reserving, at an interfering base station, time frequency resources for a predetermined time period to facilitate communication between a serving base station and a terminal, wherein the time frequency resources are reserved by the interfering base station based at least in part on a request made by the terminal observing interference from the interfering base station and a predetermined order for reserving resources; and
limiting transmission on the reserved time frequency resources during the predetermined time period to reduce interference by the interfering base station.
23. The method of claim 22, wherein the interfering base station and the serving base station are asynchronous and have different frame timing.
24. The method of claim 22, further comprising
receiving the request to reserve time frequency resources from the terminal, and
determining the terminal observing interference from the interfering base station based on the request.
25. The method of claim 24, wherein receiving the request from the terminal observing interference comprises:
receiving a pilot report from the terminal, and
determining the terminal observing interference from the interfering base station based on the pilot report.
26. The method of claim 22, wherein the limiting transmission on the reserved time frequency resources comprises avoiding transmitting on the reserved time frequency resources by the interfering base station during the predetermined time period.
27. The method of claim 22, wherein the limiting transmission on the reserved time frequency resources during the predetermined time period comprises reducing transmit power of the interfering base station on the reserved time frequency resources to obtain a target interference level for the terminal.
28. An apparatus for wireless communication, comprising:
means for reserving, at an interfering base station, time frequency resources for a predetermined time period to facilitate communication between a serving base station and a terminal, wherein the time frequency resources are reserved by the interfering base station based at least in part on a request made by the terminal observing interference from the interfering base station and a predetermined order for reserving resources; and
means for limiting transmission on the reserved time frequency resources during the predetermined time period to reduce interference by the interfering base station.
29. The apparatus of claim 28, further comprising means for receiving the request to reserve time frequency resources from the terminal.
30. The apparatus of claim 28, wherein the means for limiting transmission on the reserved time frequency resources during the predetermined time period comprises means for avoiding transmitting on the reserved time frequency resources by the apparatus.
31. A method for wireless communication by a serving base station, comprising:
sending, by the serving base station, a load information message to an interfering base station via a backhaul, the load information message comprising an interference indicator associated with an interference identified by the serving base;
receiving, at the serving base station, a response message from the interfering base station via the backhaul, the response message comprising information informing the serving base station of time frequency resources reserved for a predetermined time period by the interfering base station, wherein the interfering base station limits transmission on the reserved time frequency resources during the predetermined time period to reduce interference; and
communicating with a terminal on the reserved time frequency resources during the predetermined time period.
32. The method of claim 31, wherein the communicating with the terminal comprises sending at least one of a control channel and a data channel exclusively on the reserved time frequency resources to the terminal.
33. The method of claim 31, wherein the reserved time frequency resources comprise reserved downlink resources and reserved uplink resources, and wherein the communicating with the terminal comprises:
sending at least one of a downlink control channel and a downlink data channel on the reserved downlink resources to the terminal, and
receiving at least one of an uplink control channel and an uplink data channel on the reserved uplink resources from the terminal.
34. The method of claim 31, further comprising:
receiving channel information for the reserved time frequency resources from the terminal; and
using the channel information to select the terminal for data transmission, to select time frequency resources to use for the data transmission, to select a modulation and coding scheme for the data transmission, or a combination thereof.
35. The method of claim 31, further comprising:
broadcasting information indicative of the reserved time frequency resources.
36. An apparatus for wireless communication, comprising:
means for sending, by a serving base station, a load information message to an interfering base station via a backhaul, the load information message comprising an interference indicator associated with an interference identified by the serving base station;
means for receiving, at the serving base station, a response message from the interfering base station via the backhaul, the response message comprising information informing the serving base station of time frequency resources reserved for a predetermined time period by the interfering base station, wherein the interfering base station limits transmission on the reserved time frequency resources during the predetermined time period to reduce interference; and
means for communicating with a terminal on the reserved time frequency resources during the predetermined time period.
37. The apparatus of claim 36, wherein the means for communicating with the terminal comprises means for sending at least one of a control channel and a data channel exclusively on the reserved time frequency resources to the terminal.
38. The apparatus of claim 36, further comprising:
means for receiving channel information for the reserved time frequency resources from the terminal; and
means for using the channel information to select the terminal for data transmission, to select time frequency resources to use for the data transmission, to select a modulation and coding scheme for the data transmission, or a combination thereof.
39. A method for wireless communication at a serving base station, comprising:
detecting, by the serving base station, at least one interfering terminal causing interference at the serving base station;
sending, by the serving base station via a backhaul, a load information message to a neighbor base station, the load information message comprising an interference indicator based on the detecting the at least one interfering terminal;
receiving, at the serving base station, a response from the neighbor base station via the backhaul, the response comprising information informing the serving base station of time frequency resources reserved for a predetermined time period by the neighbor base station, wherein the at least one interfering terminal limits transmission on the reserved time frequency resources during the predetermined time period to reduce interference;
broadcasting information indicative of the reserved time frequency resources; and
communicating with a terminal on the reserved time frequency resources.
40. The method of claim 39, further comprising:
sending a request to reduce interference on the reserved time frequency resources to the at least one interfering terminal.
41. The method of claim 39, wherein the communicating with the terminal comprises receiving at least one of a control channel and a data channel sent exclusively on the reserved time frequency resources by the terminal.
42. A method for wireless communication at a terminal, comprising:
determining, at the terminal, time frequency resources reserved by a neighbor base station for a predetermined time period, wherein the time frequency resources are reserved by the neighbor base station based at least in part on a predetermined order for reserving resources, and at least one interfering terminal limits transmission on the reserved time frequency resources during the predetermined time period to reduce interference at a serving base station; and
communicating, by the terminal, with the serving base station on the reserved time frequency resources.
43. The method of claim 42, wherein the communicating with the serving base station comprises sending at least one of a control channel and a data channel exclusively on the reserved time frequency resources to the serving base station.
44. The method of claim 42, further comprising:
receiving a request to reduce interference to the neighbor base station observing interference from the terminal; and
reducing interference by the terminal on second resources reserved for the neighbor base station.
45. The method of claim 44, wherein the receiving the request comprises receiving the request to reduce interference from the neighbor base station or the serving base station.
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The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.