Method for sending preamble sequence and user equipment

An apparatus, comprising:

• one or more processors, and
• a non-transitory storage medium in communication with the one or more processors, the non-transitory storage medium including program instructions, wherein, when executed by the one or more processors, the instructions cause the apparatus to perform:
• determining a transmit power for sending a preamble sequence, wherein the transmit power meets the following formula:
• Power=min{Pmax, PREAMBLE_RECEIVED _TARGET_POWERipreamble_transmission_counter+PL};
• and
• sending the preamble sequence according to the determined transmit power through a resource i;
• wherein Power is the determined transmit power, Pmax is a maximum transmit power of the apparatus, PL is obtained by estimating according to a downlink path loss, PREAMBLE_RECEIVED _TARGET_POWERipreamble_transmission_counter is a target receive power of the preamble sequence, and the resource i is a preamble sequence resource for coverage enhancement random access;
• wherein PREAMBLE_RECEIVED _TARGET_POWERipreamble_transmission_counter meets PREAMBLE_RECEIVED _TARGET_POWERipreamble_transmission_counter=preambleInitialReceivedTargetPower+DELTA_PREAMBLE−Xi+(preamble_transmission _counter−1)*powerRampingStep, preambleInitialReceivedTargetPower is an initial target receive power of the preamble sequence, DELTA_PREAMBLE is a power offset based on a format of the preamble sequence, powerRampingStep is a power ramp step, preamble_transmission _counter is a transmission count of the preamble sequence with an initial value of 1, and Xi is a power offset corresponding to a repetition count, the repetition count corresponding to a preamble sequence resource i, and
• wherein the power offset X meets:
• PREAMBLE_RECEIVED _TARGET_POWERipreamble_transmission_counter+PL−Pmax≤Δ, wherein Δ≥0, and Δ is a constant and a preset threshold.

A non-transitory computer-readable medium having program instructions recorded thereon, wherein, when executed by a processor of a terminal device, the instructions cause the terminal device to:

• determine a transmit power for sending a preamble sequence, wherein the transmit power meets the following formula:
• Power=min{Pmax, PREAMBLE_RECEIVED _TARGET_POWERipreamble_transmission_counter+PL};
• send the preamble sequence according to the determined transmit power through a resource i;
• wherein Power is the determined transmit power, Pmax is a maximum transmit power of the terminal device, PL is obtained by estimating according to a downlink path loss, PREAMBLE_RECEIVED _TARGET_POWERipreamble_transmission_counter is a target receive power of the preamble sequence, and the resource i is a preamble sequence resource for coverage enhancement random access;
• PREAMBLE_RECEIVED _TARGET_POWERipreamble_transmission_counter meets:
• PREAMBLE_RECEIVED _TARGET_POWERipreamble_transmission_counter=preambleInitialReceivedTargetPower+DELTA_PREAMBLE—Xi+(preamble_transmission _counter−1)*powerRampingStep, preambleInitialReceivedTargetPower is an initial target receive power of the preamble sequence, DELTA_PREAMBLE is a power offset based on a format of the preamble sequence, powerRampingStep is a power ramp step, preamble_transmission _counter is a transmission count of the preamble sequence with an initial value of 1, and Xi is a power offset corresponding to a repetition count, the repetition count corresponding to a preamble sequence resource i,
• wherein the power offset Xi meets:
• PREAMBLE_RECEIVED _TARGET_POWERipreamble_transmission_counter+PL−Pmax≤Δ, wherein Δ≥0, and Δ is a constant and a preset threshold.