Method and apparatus for adjusting a beam sweeping pattern in wireless communication system
The present disclosure relates to a pre-5 th -Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4 th -Generation (4G) communication system such as Long Term Evolution (LTE). Embodiments of the present invention provide a method and an apparatus for adaptively determining a beam sweeping pattern of a base station in a beamforming-based wireless communication system. An embodiment of the present invention provides an operating method of a serving base station in a wireless communication system, the operating method comprising: receiving, from at least one terminal, beam collision information indicating a collision between beams received from the serving base station and at least one neighboring base station adjacent to the serving base station; and adjusting a beam sweeping pattern of a beam transmitted to the at least one terminal on the basis of the received beam collision information. Various other embodiments of the present invention are also disclosed.
1. A method of a serving base station (BS) in a wireless communication system, the method comprising:
transmitting, to a terminal, signals according to a first a beam sweeping pattern for beams;
receiving, from the terminal, beam collision information for indicating a collision between a first beam of the serving BS and a second beam of a neighboring BS, the first beam being one of the beams; and
transmitting, to the terminal, signals according to a second beam sweeping pattern for the beams based on the beam collision information,
wherein the beam collision information is generated when a difference value between a signal quality of the first beam and a signal quality of the second beam is less than a first threshold value.
2. The method of claim 1 ,
wherein the first beam is identified based on signal qualities from among the beams of the serving BS,
wherein the second beam is identified based on signal qualities from among a plurality of beams of the neighboring BS, and
wherein the beam collision information is generated if the signal quality of the first beam is greater than a second threshold value.
3. The method of claim 1 , further comprising:
detecting a predetermined event for adjusting the first beam sweeping pattern;
transmitting, to the neighboring BS, a start message indicating that the adjustment of the first beam sweeping pattern is initiated; and
transmitting, to the terminal, a request signal for the beam collision information in response to detecting of the predetermined event,
wherein the predetermined event comprises at least one of:
a case where a base station is installed and a beam sweeping pattern is never changed,
a case where the corresponding base station is turned off from a turned on state,
a case where one or a plurality of neighboring base stations of the corresponding base station is turned off,
a case where one or a plurality of neighboring base stations of the corresponding base station is turned on,
a case where one or a plurality of neighboring base stations of the corresponding base station changes a beam sweeping pattern,
a case where a predetermined time elapses after the corresponding base station has adjusted the beam sweeping pattern, and
a case where a request for adjusting the beam sweeping pattern is received from another base station.
4. The method of claim 1 ,
wherein the first beam sweeping pattern is adjusted if a number of reception for the beam collision information exceeds a predetermined number of reception, and
wherein the terminal is located at an edge of a coverage for the serving BS.
5. The method of claim 1 , further comprising:
transmitting, to the neighboring BS, an end message indicating that the adjustment of the first beam sweeping pattern is ended; and
transmitting, to the terminal, a result signal comprising the second beam sweeping pattern adjusted from the first beam sweeping pattern.
6. The method of claim 1 , wherein a beam sweeping pattern of the neighboring BS is not adjusted for a period from a time for the start message to a time of the end message.
7. The method of claim 1 , wherein adjusting of the first beam sweeping pattern comprises at least one of:
selecting one of available beam sweeping patterns randomly,
selecting a beam sweeping pattern which makes a number of changed beams minimal among the available beam sweeping patterns, and
selecting a beam sweeping pattern which makes a total sum or a maximum value of an amount of interference that the base station receives minimal among the available beam sweeping patterns.
8. An apparatus of a serving base station (BS) in a wireless communication system, the apparatus comprising:
a transceiver; and
at least one processor, operatively coupled to the transceiver,
configured to:
transmit, to a terminal, signals according to a first beam sweeping pattern for beams,
receive, from the terminal, beam collision information for indicating a collision between a first beam of the serving BS and a second beam of a neighboring BS, the first beam being one of the beams, and
transmit, to the terminal, signals according to a second beam sweeping pattern based on the beam collision information,
wherein the beam collision information is generated when a difference value between a signal quality of the first beam and a signal quality of the second beam is less than a first threshold value.
9. The apparatus of claim 8 ,
wherein the first beam is identified based on signal qualities from among the beams of the serving BS,
wherein the second beam is identified based on signal qualities from among a plurality of beams of the neighboring BS, and
wherein the beam collision information is generated if the signal quality of the first beam is greater than a second threshold value.
10. The apparatus of claim 8 , wherein the at least one processor is further configured to:
detect a predetermined event for adjusting the first beam sweeping pattern;
transmit, to the neighboring BS, a start message indicating that the adjustment of the first beam sweeping pattern is initiated; and
transmit, to the terminal, a request signal for the beam collision information in response to detecting of the predetermined event, and
wherein the predetermined event comprises at least one of:
a case where a base station is installed and a beam sweeping pattern is never changed,
a case where the corresponding base station is turned off from a turned on state,
a case where one or a plurality of neighboring base stations of the corresponding base station is turned off,
a case where one or a plurality of neighboring base stations of the corresponding base station is turned on,
a case where one or a plurality of neighboring base stations of the corresponding base station changes a beam sweeping pattern,
a case where a predetermined time elapses after the corresponding base station has adjusted the beam sweeping pattern, and
a case where a request for adjusting the beam sweeping pattern is received from another base station.
11. The apparatus of claim 8 , wherein the first beam sweeping pattern is adjusted if a number of reception for the beam collision information exceeds a predetermined number of reception, and
wherein the terminal is located at an edge of a coverage for the serving BS.
12. The apparatus of claim 8 , wherein the at least one processor is further configured to:
transmit, to the neighboring BS, an end message indicating that the adjustment of the first beam sweeping pattern is ended, and
transmit, to the terminal, a result signal comprising the second beam sweeping pattern adjusted from the first beam sweeping pattern.
13. The apparatus of claim 8 , wherein a beam sweeping pattern of the neighboring BS is not adjusted for a period from a time for the start message to a time of the end message.
14. The apparatus of claim 8 , wherein the adjustment of the first beam sweeping pattern into the second beam sweeping pattern is performed by at least one of:
selecting one of available beam sweeping patterns randomly,
selecting a beam sweeping pattern which makes a number of changed beams minimal among the available beam sweeping patterns, and
selecting a beam sweeping pattern which makes a total sum or a maximum value of an amount of interference that the base station receives minimal among the available beam sweeping patterns.
15. An apparatus of a terminal in a wireless communication system, the apparatus comprising:
a transceiver; and
at least one processor, operatively coupled to the transceiver,
configured to:
receive, from a serving base station (BS), signals being transmitted according to a first beam sweeping pattern for beams,
generate beam collision information for indicating a collision between a first beam of the serving BS and a second beam of a neighboring BS, the first beam being one of the beams, and
transmit, to the serving BS, the beam collision information,
wherein the beam collision information is generated when a difference value between a signal quality of the first beam and a signal quality of the second beam is less than a threshold value.
16. The apparatus of claim 15 ,
wherein the first beam is identified based on signal qualities from among the beams of the serving BS, and
wherein the second beam is identified based on signal qualities from among a plurality of beams of the neighboring BS.
17. The apparatus of claim 15 , wherein the at least one processor is further configured to:
receive, from the serving BS, a request signal for the beam collision information, and
measure a signal quality for the first beam of the serving BS and the second beam of the neighboring BS.
18. The apparatus of claim 15 , wherein the at least one processor is further configured to receive, from the serving BS, a message comprising a second beam sweeping pattern which is a result of the adjustment of the first beam sweeping pattern.
19. The apparatus of claim 15 ,
wherein the beam collision information is further generated if the signal quality of the first beam is greater than a second threshold value, and
wherein the terminal is located at an edge of a coverage for the serving BS.
20. The apparatus of claim 15 , wherein the at least one processor is further configured to:
perform a modification for an operation of the apparatus according to the second beam sweeping pattern, and
receive, from the serving BS, signal being transmitted according to the second beam sweeping pattern.