Narrowband internet of things system and preamble transmission method thereof

A Narrowband Internet of Things (NB-IoT) system, comprising:

• a base station, being configured to broadcast a random access resource configuration, wherein the random access resource configuration comprises a Narrowband Physical Random Access Channel (NPRACH) transmission period and an NPRACH access intermitting setting, the NPRACH access intermitting setting allocates an NPRACH pause period and a Narrowband Physical Downlink Control Channel (NPDCCH);
• and
• a user equipment, being configured to receive the random access resource configuration, and transmit a preamble repeatedly in an NPRACH during the NPRACH transmission period according to the random access resource configuration;
• wherein the base station is further configured to:
• detect the preamble in the NPRACH during the NPRACH transmission period;
• and
• transmit a random access feedback message in the NPDCCH during the NPRACH pause period according to the preamble;
• and wherein the user equipment is further configured to:
• receive the random access feedback message in the NPDCCH during the NPRACH pause period;
• and
• adjust transmission behavior of transmitting the preamble during the NPRACH transmission period according to the random access feedback message.

A preamble transmission method for a base station, the base station being used in a Narrowband Internet of Things (NB-IoT) system that further comprises a user equipment, the preamble transmission method comprising:

• (a) the base station broadcasting a random access resource configuration, wherein the random access resource configuration comprises a Narrowband Physical Random Access Channel (NPRACH) transmission period and an NPRACH access intermitting setting, the NPRACH access intermitting setting allocates an NPRACH pause period and a Narrowband Physical Downlink Control Channel (NPDCCH) so that the user equipment receives the random access resource configuration and transmits a preamble repeatedly in an NPRACH during the NPRACH transmission period according to the random access resource configuration;
• (b) the base station detecting the preamble in the NPRACH during the NPRACH transmission period;
• and
• (c) the base station transmitting a random access feedback message in the NPDCCH during the NPRACH pause period according to the preamble so that the user equipment receives the random access feedback message in the NPDCCH during the NPRACH pause period and adjusts transmission behavior of transmitting the preamble during the NPRACH transmission period according to the random access feedback message.

A base station for use in a Narrowband Internet of Things (NB-IoT) system, the NB-IoT system further comprising a user equipment, the base station comprising:

• a transceiver;
• and
• a processor;
• wherein the processor is configured to perform the following operations via the transceiver:
• broadcasting a random access resource configuration, wherein the random access resource configuration comprises a Narrowband Physical Random Access Channel (NPRACH) transmission period and an NPRACH access intermitting setting, the NPRACH access intermitting setting allocates an NPRACH pause period and a Narrowband Physical Downlink Control Channel (NPDCCH) so that the user equipment receives the random access resource configuration and transmits a preamble repeatedly in an NPRACH during the NPRACH transmission period according to the random access resource configuration;
• detecting the preamble in the NPRACH during the NPRACH transmission period;
• and
• transmitting a random access feedback message in the NPDCCH during the NPRACH pause period according to the preamble so that the user equipment receives the random access feedback message in the NPDCCH during the NPRACH pause period and adjusts transmission behavior of transmitting the preamble during the NPRACH transmission period according to the random access feedback message.

A preamble transmission method for a user equipment, the user equipment being used in a Narrowband Internet of Things (NB-IoT) system that further comprises a base station, the preamble transmission method comprising:

• (a) the user equipment receiving a random access resource configuration broadcasted by the base station, wherein the random access resource configuration comprises a Narrowband Physical Random Access Channel (NPRACH) transmission period and an NPRACH access intermitting setting, the NPRACH access intermitting setting allocates an NPRACH pause period and a Narrowband Physical Downlink Control Channel (NPDCCH);
• (b) the user equipment transmitting a preamble repeatedly in an NPRACH during the NPRACH transmission period according to the random access resource configuration so that the base station detects the preamble in the NPRACH during the NPRACH transmission period and transmits a random access feedback message in the NPDCCH during the NPRACH pause period according to the preamble;
• (c) the user equipment receiving the random access feedback message in the NPDCCH during the NPRACH pause period;
• and
• (d) the user equipment adjusting transmission behavior of transmitting the preamble during the NPRACH transmission period according to the random access feedback message.

A user equipment for use in a Narrowband Internet of Things (NB-IoT) system, the NB-IoT system further comprising a base station, the user equipment comprising:

• a transceiver;
• and
• a processor;
• wherein the processor is configured to perform the following operations via the transceiver:
• receiving a random access resource configuration broadcasted by the base station, wherein the random access resource configuration comprises a Narrowband Physical Random Access Channel (NPRACH) transmission period and an NPRACH access intermitting setting, the NPRACH access intermitting setting allocates an NPRACH pause period and a Narrowband Physical Downlink Control Channel (NPDCCH);
• transmitting a preamble repeatedly in an NPRACH during the NPRACH transmission period according to the random access resource configuration so that the base station detects the preamble in the NPRACH during the NPRACH transmission period and transmits a random access feedback message in the NPDCCH during the NPRACH pause period according to the preamble;
• receiving the random access feedback message in the NPDCCH during the NPRACH pause period;
• and
• adjusting transmission behavior of transmitting the preamble during the NPRACH transmission period according to the random access feedback message.