US 12,245,289 B2
Communications device, infrastructure equipment and methods for differentiating between 2-step RACH and 4-step RACH
Yassin Aden Awad, Basingstoke (GB); Vivek Sharma, Basingstoke (GB); Samuel Asangbeng Atungsiri, Basingstoke (GB); Yuxin Wei, Basingstoke (GB); Hideji Wakabayashi, Basingstoke (GB); and Naoki Kusashima, Basingstoke (GB)
Assigned to SONY GROUP CORPORATION, Tokyo (JP)
Appl. No. 17/771,506
Filed by Sony Group Corporation, Tokyo (JP)
PCT Filed Oct. 27, 2020, PCT No. PCT/EP2020/080164
§ 371(c)(1), (2) Date Apr. 25, 2022,
PCT Pub. No. WO2021/083886, PCT Pub. Date May 6, 2021.
Claims priority of application No. 19206798 (EP), filed on Nov. 1, 2019; and application No. 19217252 (EP), filed on Dec. 17, 2019.
Prior Publication US 2022/0369378 A1, Nov. 17, 2022
Int. Cl. H04W 74/0833 (2024.01); H04W 74/0836 (2024.01); H04W 74/0838 (2024.01)
CPC H04W 74/0833 (2013.01) 17 Claims
OG exemplary drawing
 
1. A method of operating a communications device in a wireless communications network, the method comprising:
transmitting a random access message on a wireless access interface, the random access message comprising a selected random access preamble,
receiving a resource allocation message comprising an indication of downlink communications resources allocated for the transmission of a random access response message combined with a radio network terminal identifier which identifies the communications device which transmitted the random access message,
determining that the resource allocation message identifies the communications device, and
in response to determining that the resource allocation message identifies the communications device, receiving and decoding the signals transmitted using the allocated downlink communications resources,
wherein the determining that the resource allocation message identifies the communications device comprises:
calculating the radio network terminal identifier which is used in the resource allocation message to identify the communications device using an offset relative to a starting symbol of a physical random access channel (PRACH) occasion, and
confirming that the calculated radio network terminal identifier corresponds with the radio network terminal identifier present in the resources allocation message, and
wherein the method further comprises receiving a plurality of offsets in a broadcast transmission from an infrastructure equipment of the wireless communications network, the communications device being configured to select one of the offsets to generate the radio network terminal identifier for each PRACH occasion.