Random access method and apparatus

A base station, comprising:

• a processor, configured to:
• pre-configure a physical random access channel (PRACH) resource, and generate at least one group of PRACH configuration information to send to a terminal device, wherein each group in the at least one group corresponds to a respective coverage enhancement level, and
• acquire a corresponding start PRACH resource according to the corresponding PRACH configuration information;
• a receiver, configured to:
• receive a preamble from the terminal device, and
• perform, according to a specified random access radio network temporary identifier (RA-RNTI) calculation formula, scrambling on downlink resource information corresponding to the start PRACH resource, wherein the specified RA-RNTI calculation formula comprises:
• RA-RNTI=1+t_id+10*f_id+X, wherein, X is an offset that corresponds to the respective coverage enhancement level, t_id and f_id indicate one of (a) a first PRACH resource or (b) a last PRACH resource used when the preamble is repeatedly sent;
• and
• a transmitter, configured to:
• send, on a PDCCH channel, scrambled downlink resource information which indicates rejection information, wherein the rejection information instruct to quit sending a preamble for a preset period of time, and wherein the rejection information includes the preset period of time.

A random access method, comprising:

• acquiring at least one group of physical random access channel (PRACH) configuration information which is carried in system information, wherein each group in the at least one group corresponds to a respective coverage enhancement level;
• matching corresponding PRACH configuration information according to a matched coverage enhancement level;
• acquiring a corresponding start PRACH resource according to the corresponding PRACH configuration information;
• sending a preamble to the base station starting from the start PRACH resource;
• acquiring, on a PDCCH channel according to a specified random access radio network temporary identifier (RA-RNTI) calculation formula, downlink resource information, wherein the specified RA-RNTI calculation formula comprises:
• RA-RNTI=1+t_id+10*f_id+X, wherein, X is an offset that corresponds to the respective coverage enhancement level, t_id and f_id indicate one of (a) a first PRACH resource or (b) a last PRACH resource used when the preamble is repeatedly sent;
• and
• quitting sending the preamble to the base station for a preset period of time when the acquired downlink resource information indicates rejection information, wherein the rejection information includes the preset period of time.

A random access method, comprising:

• pre-configuring a physical random access channel (PRACH) resource, and generating at least one group of PRACH configuration information to send to a terminal device, wherein each group in the at least one group corresponds to a respective coverage enhancement level;
• and acquires a corresponding start PRACH resource according to the corresponding PRACH configuration information;
• receiving a preamble from the terminal device, and performing, according to a specified random access radio network temporary identifier (RA-RNTI) calculation formula, scrambling on downlink resource information corresponding to the start PRACH resource, wherein the specified RA-RNTI calculation formula comprises:
• RA-RNTI=1+t_id+10*f_id+X, wherein, X is an offset that corresponds to the respective coverage enhancement level, t_id and f_id indicate one of (a) a first PRACH resource or (b) a last PRACH resource used when the preamble is repeatedly sent;
• and
• sending, on a PDCCH channel, scrambled downlink resource information which indicates rejection information, wherein the rejection information instruct to quit sending a preamble for a preset period of time, and wherein the rejection information includes the preset period of time.