Method for generating random access signal of machine type communication device using narrow bandwidth
Disclosed are a method for generating a random access signal of a machine type communication (MTC) device using a narrow bandwidth, and an MTC device. The method generates a random access signal by allocating a position in a frequency domain of a random access signal dedicated to the MTC device, that is, a position of a frequency for transmission of a random access preamble, to a center position of a base station system bandwidth, or by shifting a center frequency of the MTC device to a position of a random access frequency allocated for a legacy LTE terminal by a base station.
1. A method for generating a random access signal of a machine type communication (MTC) device using a narrow bandwidth, comprising:
receiving, via a transmitting and receiving unit within the MTC device, system information transmitted by a base station (BS);
extracting, via a control unit within the MTC device, random access-related information from the system information received;
generating, via the control unit within the MTC device, the random access signal by using the random access-related information extracted and predetermined frequency resource block-related information for the random access signal; and
acquiring, via the control unit within the MTC device, information on a band allocated for the random access signal of a general user equipment (UE) by the BS; and
when the band allocated for the random access signal of the general UE deviates from band of the MTC device, shifting, via the control unit within the MTC device, a center of the band of the MTC device toward the band allocated for the random access signal of the general UE such that the band allocated for the random access signal of the general UE is included within the band of the MTC device.
2. The method of claim 1 , wherein the random access-related information includes information on a preamble format and transmission time.
3. The method of claim 1 , wherein the predetermined frequency resource block-related information for the random access signal includes information on a first physical resource block occupied by a physical random access channel resource.
4. The method of claim 3 , wherein the position of the first physical resource block occupied by the physical random access channel resource is set to a fixed value according to the bandwidth of the MTC device.
5. The method of claim 1 , wherein a band used by the MTC device is located within a system bandwidth used by the BS.
6. The method of claim 5 , wherein the band used by the MTC device is located at a center of the system bandwidth used by the BS.
7. A machine type communication (MTC) device comprising:
a transmitting and receiving unit that receives system information transmitted by a base station (BS); and
a control unit that extracts random access-related information from the system information received and generate a random access signal by using the random access-related information received and predetermined frequency resource block-related information for the random access signal,
wherein the control unit acquires information on a band allocated for the random access signal of a general user equipment (UE) by the BS from the system information received by the transmitting and receiving unit and, when the band allocated for the random access signal of the general UE deviates from the band of the MTC device, shifts a center of the band of the MTC device toward the band allocated for the random access signal of the general UE such that the band allocated for the random access signal of the general UE is included within the band of the MTC device.
8. The MTC device of claim 7 , wherein the random access-related information includes information on a preamble format and transmission time.
9. The MTC device of claim 7 , wherein the predetermined frequency resource block-related information for the random access signal includes information on a first physical resource block occupied by a physical random access channel resource.
10. The MTC device of claim 9 , wherein a position of the first physical resource block occupied by the physical random access channel resource is set to a fixed value according to the bandwidth of the MTC device.
11. The MTC device of claim 7 , wherein a band used by the MTC device is located within a system bandwidth used by the BS.
12. The MTC device of claim 11 , wherein the band used by the MTC device is located at a center of the system bandwidth used by the BS.
13. The MTC device of claim 7 , further comprising a storage unit configured to store information on the bandwidth of the MTC device, information on a random access preamble format and transmission time, and information on a fixed value of a first physical resource block occupied by a physical random access channel resource.