Random access response message transmission

An apparatus, comprising:

• at least one processor;
• and
• at least one memory comprising computer program code,
• the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to
• select a subframe for a first transmission of a preamble based on a configuration broadcast by an evolved node B;
• and
• repeat transmission of the preamble within a preamble repetition period based on a configuration received from a broadcast by the evolved node B;
• wherein the configuration for the preamble repetition period comprises one or more of number of repetitions within the repetition period and interval between the preamble repetitions;
• after completing a required number of preamble repetitions within the preamble repetition period, starting monitoring enhanced physical downlink control channel transmission from a subframe that is k subframes after the completion of the preamble transmission for receiving a random access response message, where k is a parameter received through broadcasted by system information;
• wherein the enhanced physical downlink control channel is identified by a random access radio network temporary identifier (RA-RNTI) according to the following equation:
• RA-RNTI=1+SFN_PRACH/R_R_Period+10*f_id,
• where SFN_PRACH is the system frame number of the frame at which physical random access channel occasion occurs, R_R_Period is the preamble repetition period, and f_id is the number of physical random access channel regions that map to the same enhanced physical downlink control channel region.

An apparatus, comprising:

• at least one processor;
• and
• at least one memory comprising computer program code,
• the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to
• detect a potential preamble only from physical random access channel occasion;
• and
• combine repetitions of the preamble within a repetition period based on a pattern broadcast by the apparatus functioning as a network node;
• wherein the network node determines a configuration for the preamble repetition period and the configuration for the preamble period comprises one or more of number of repetitions within the repetition period and interval between the preamble repetitions;
• wherein after a required number of preamble repetitions within the preamble repetition period is completed, provide an enhanced physical downlink control channel transmission for monitoring from a subframe that is k subframes after the completion of the preamble transmission for receiving a random access response message, where k is a parameter received through broadcasted by system information;
• wherein the enhanced physical downlink control channel is identified by a random access radio network temporary identifier (RA-RNTI) according to the following equation:
• RA-RNTI=1+SFN_PRACH/R_R_Period+10*f_id,
• where SFN_PRACH is the system frame number of the frame at which physical random access channel occasion occurs, R_R_Period is the preamble repetition period, and f_id is the number of physical random access channel regions that map to the same enhanced physical downlink control channel region.