CPC H04W 74/0833 (2013.01) [H04L 1/1861 (2013.01); H04L 5/0048 (2013.01)] | 5 Claims |
1. A method for channel estimation by a radio access network (RAN) infrastructure node, the method comprising:
receiving, as part of a two-step random access channel (RACH) access procedure, a combination of a message 1 plus a message 3 from a UE; and
estimating channel conditions using characteristics of the message 1;
wherein the message 1 includes a physical RACH (PRACH) preamble in a PRACH slot within a first time range spanning a first frequency range, the PRACH preamble selected from a set of PRACH preambles;
wherein the message 3 is a physical uplink shared channel (PUSCH) message in one or more PUSCH slots within a second time range spanning a second frequency, the PUSCH message including a demodulation reference signal (DMRS) symbol pattern selected from a set of DMRS symbol patterns;
wherein one or more of the first frequency range, the first time range, the second time range and the second frequency range are signaled in a parameter set; and
wherein the parameter set includes one or more of PRACH preamble sequences, PRACH formats, power offset, a receive target power of the PRACH preamble and a power ramp step for PRACH preambles.
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