Method and device for performing beam searching in mobile communication system

Abstract

The disclosure relates to a communication technique for a 5G communication system for supporting a higher data transfer rate after a 4G system, and a system therefor. The disclosure may be applied to an intelligent service (for example, a smart home, a smart building, a smart city, a smart car or connected car, healthcare, digital education, retail business, and a service relating to security and safety), based on a 5G communication technology and an IoT-related technology. The disclosure relates to a method and device for performing beam searching in a mobile communication system using beamforming.

What is claimed is: 
     
         1 . An electronic device comprising:
 a housing;   at least one antenna array including antenna elements comprising at least one antenna arranged in the housing or arranged in a part of the housing;   at least one processor operably connected to the antenna array and configured to control the electronic device to generate a first reception beam set including N reception beams having different directions and a second reception beam set including at least one reception beam having different directions using the antenna array; and   a memory operably connected to the processor,   wherein the memory is configured to store instructions which, when executed by the processor, control the electronic device to:   perform frequency scanning on signals transmitted from at least one base station based on N being greater than a first threshold value using at least a part of the second reception beam set,   wherein N is an integer equal to or greater than 1,   wherein a width of each reception beam included in the second reception beam set is greater than a width of each reception beam included in the first reception beam set.   
     
     
         2 . The electronic device of  claim 1 ,
 wherein the second reception beam set includes M reception beams,   wherein M is an integer equal to or greater than 1 and less than N.   
     
     
         3 . The electronic device of  claim 1 , wherein the instructions, when executed by the processor, control the electronic device to:
 identify, based on at least a part of a result of the frequency scanning, a plurality of transmission beams transmitted from the at least one base station.   
     
     
         4 . The electronic device of  claim 1 , wherein the instructions, when executed by the processor, control the electronic device to:
 identify a frequency range for frequency scanning on signals transmitted from at least one base station using at least a part of the first reception beam set; and   perform frequency scanning on the signals based on the frequency range being greater than a first threshold value, based on at least a part of the identified frequency range using at least a part of the second reception beam set.   
     
     
         5 . The electronic device of  claim 1 , wherein the instructions, when executed by the processor, control the electronic device to:
 perform frequency scanning using at least a part of the first reception beam set or at least a part of the second reception beam set;   measure strengths of signals of a plurality of transmission beams transmitted from at least one base station based on at least a part of a result of the frequency scanning using at least a part of the second reception beam set; and   select a transmission beam among the transmission beams based on at least a part of a result of the measurement.   
     
     
         6 . The electronic device of  claim 5 , wherein the instructions, when executed by the processor, control the electronic device to:
 measure strengths of signals of the plurality of transmission beams using at least a part of the second reception beam set based on a strength of at least one signal discovered as the result of the frequency scanning being greater than a first threshold value.   
     
     
         7 . The electronic device of  claim 5 , wherein the instructions, when executed by the processor, control the electronic device to:
 select the transmission beam having the greatest signal strength among the plurality of transmission beams, based on the result of the measurement.   
     
     
         8 . The electronic device of  claim 1 , wherein the instructions, when executed by the processor, control the electronic device to:
 generate a first beam pair link with a first transmission beam transmitted from a first base station using a first reception beam included in the first reception beam set;   measure a strength of at least one signal received through the first beam pair link; and   measure strengths of signals transmitted from the first base station and/or at least one second base station adjacent to the first base station based on at least a part of a result of the measurement using the second reception beam set.   
     
     
         9 . The electronic device of  claim 8 , wherein the instructions, when executed by the processor, control the electronic device to:
 based on the result of the measurement being greater than a first threshold value, measure, based on at least a part of a result of the measurement using the second reception beam set, strengths of signals transmitted from the first base station and/or at least one second base station adjacent to the first base station.   
     
     
         10 . The electronic device of  claim 1 , wherein the instructions, when executed by the processor, control the electronic device to:
 generate a first beam pair link with a first transmission beam transmitted from a first base station using a first reception beam included in the first reception beam set;   identify a first number of at least one signal transmitted from the first base station through the first beam pair link; and   measure strengths of signals transmitted from the first base station and/or at least one second base station adjacent to the first base station based on at least a part of the first number using the second reception beam set.   
     
     
         11 . The electronic device of  claim 10 , wherein the instructions, when executed by the processor, control the electronic device to:
 further identify a second number of signals transmitted from the at least one second base station through the first beam pair link; and   measure strengths of signals transmitted from the first base station and/or at least one second base station adjacent to the first base station based on at least a part of the first number and the second number using the second reception beam set.   
     
     
         12 . A method for performing beam searching by an electronic device in a wireless communication system, the method comprising:
 determining a width of a beam for receiving a signal transmitted from a first base station;   receiving a first synchronization signal (SS) block from the first base station, based on the determined beam width;   synchronizing with the first base station, based on synchronization information included in the first SS block; and   determining, based on a first physical broadcast channel (PBCH) included in the first SS block, an index of a beam received from the first base station.   
     
     
         13 . The method of  claim 12 , further comprising:
 receiving a second SS block from a second base station based on the determined beam width,   wherein the determining of the index of the beam comprises:   decoding, by a first decoder, the first PBCH included in the first SS block and simultaneously decoding, by a second decoder, a second PBCH included in the second SS block; and   obtaining, based on a result of the decoding of the first PBCH, an index of a beam received from the first base station and obtaining, based on a result of the decoding of the second PBCH, an index of a beam received from the second base station.   
     
     
         14 . The method of  claim 13 ,
 wherein the determining of the index of the beam further comprises:   measuring, by a first reference signal measuring unit comprising reference signal measuring circuitry, a reception power of a first reference signal received from the first base station and simultaneously measuring, by a second reference signal measuring unit comprising reference signal measuring circuitry, a reception power of a second reference signal received from the second base station; and   decoding the first PBCH, based on the reception power of the first reference signal by the first decoder and decoding the second PBCH, based on the reception power of the second reference signal by the second decoder.   
     
     
         15 . The method of  claim 12 ,
 wherein the determining of the width of the beam comprises:   identifying a number of reception beams of the electronic device; and   based on the identified number of the reception beams of the electronic device exceeding a first threshold value, determining a first width as the width of the beam, and based on the identified number of the reception beams of the electronic device being less than or equal to the first threshold value, determining a second width as the width of the beam,   wherein the first width is greater than the second width.   
     
     
         16 . The method of  claim 12 ,
 wherein the determining of the width of the beam comprises:   identifying a frequency range for which beam searching is performed; and   based on the identified frequency range exceeding a second threshold value, determining a first width as the width of the beam, and based on the identified frequency range being less than or equal to the second threshold value, determining a second width as the width of the beam,   wherein the first width is greater than the second width.   
     
     
         17 . The method of  claim 12 ,
 wherein the determining of the width of the beam comprises:   identifying a strength of a beam transmitted from the base station; and   based on the identified strength of the beam exceeding a third threshold value, determining a first width as the width of the beam, and based on the identified strength of the beam being less than or equal to the third threshold value, determining a second width as the width of the beam,   wherein the first width is greater than the second width.   
     
     
         18 . The method of  claim 12 , further comprising:
 receiving a second SS block from a second base station based on the determined beam width; and   based on a power value of a signal received from the first base station or the second base station, determining whether to change the width of the beam for receiving the signal.   
     
     
         19 . The method of  claim 18 ,
 wherein the determining of whether to change the width of the beam comprises:   identifying a number of signals among signals received from the first base station, having reception powers exceeding a first critical value, excluding a signal having a greatest reception power; and   based on the number of the signals having reception powers exceeding the first critical value exceeding a fourth threshold value, changing the width of the beam for receiving the signal, to be greater.   
     
     
         20 . The method of  claim 18 ,
 wherein the determining of whether to change the width of the beam comprises:   identifying a number of signals among signals received from the second base station, having reception powers exceeding a second critical value; and   based on the number of the signals having reception powers exceeding the second critical value exceeding a fifth threshold value, changing the width of the beam for receiving the signal, to be greater.