Method for configuring random access channel transmitting resource and device thereof

A method performed by an user equipment, comprising:

• Receiving Narrowband Physical Random Access Channel (NPRACH) configurations for Time Division Duplex (TDD), including:
• first information for indicating a NPRACH periodicity (P), with a value chosen from a set {80 ms, 160 ms, 320 ms, 640 ms, 1280 ms, 2560 ms, 5120 ms, 10240 ms};
• second information for indicating a NPRACH offset (O), in unit of radio frame;
• Transmitting NPRACH based on the received NPRACH configurations, wherein
• The NPRACH starts in a radio frame nf fulfilling (nf−O) mod (P/10)=0.

An user equipment, comprising:

• Receiving circuitry configured to receive Narrowband Physical Random Access Channel (NPRACH) configurations for Time Division Duplex (TDD), including:
• first information for indicating a NPRACH periodicity (P), with a value chosen from a set {80 ms, 160 ms, 320 ms, 640 ms, 1280 ms, 2560 ms, 5120 ms, 10240 ms};
• second information for indicating a NPRACH offset (O), in unit of radio frame;
• Transmitting circuitry configured to transmit NPRACH based on the received NPRACH configurations, wherein
• The NPRACH starts in a radio frame nf fulfilling (nf−O) mod (P/10)=0.

A base station, comprising:

• Transmitting circuitry configured to transmit Narrowband Physical Random Access Channel (NPRACH) configurations for Time Division Duplex (TDD), including:
• first information for indicating a NPRACH periodicity (P), with a value chosen from a set {80 ms, 160 ms, 320 ms, 640 ms, 1280 ms, 2560 ms, 5120 ms, 10240 ms};
• second information for indicating a NPRACH offset (O), in unit of radio frame;
• Receiving circuitry configured to receive PRACH based on the NPRACH configurations, wherein
• The NPRACH starts in a radio frame of fulfilling (nf−O) mod (P/10)=0.