# US 2025/0168893 A1 · Configuration of random access channel resources > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0168893 A1 - Document ID: US20250168893A1 - Status: Published application - Kind: A1 - Application number: 18/840,251 - Filed: 2023-01-20 - Published: 2025-05-22 - Earliest claimed: 2022-02-21 - Assignees: Nokia Technologies Oy - Applicants: Nokia Technologies Oy - Inventors: Halit Murat GÜRSU; Ugur Baran ELMALI; Malgorzata TOMALA; Ömer BULAKCI - Web page: https://patentgrep.com/patent/US20250168893A1 ## CPC - H04W 56/002: {Mutual synchronization} - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0836: with 2-step access - H04W 74/0838: using contention-free random access [CFRA] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract There is provided an apparatus comprising at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least: receiving (410), from a network node in a radio access network, at least one random access configuration for the apparatus to access to the radio access network, wherein the at least one random access configuration comprises a mapping between a set of synchronization signal blocks and one or more preambles in at least one physical random access channel occasion according to one or more features; determining (420), based on at least one of the one or more features, at least one preamble of the one or more preambles in a physical random access channel occasion corresponding to at least one synchronization signal block in the set of synchronization signal blocks; and transmitting (430), to the network node, the at least one preamble. ## Claims ### Claim 1 An apparatus comprising at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least: receiving, from a network node in a radio access network, at least one random access configuration for the apparatus to access to the radio access network, wherein the at least one random access configuration comprises a mapping between a set of synchronization signal blocks and one or more preambles in at least one physical random access channel occasion according to one or more features; determining, based on at least one of the one or more features, at least one preamble of the one or more preambles in a physical random access channel occasion corresponding to at least one synchronization signal block in the set of synchronization signal blocks; and transmitting, to the network node, the at least one preamble. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the one or more features comprise at least one of: coverage enhancement, network slicing, reduced capability, and small data transmission. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the mapping comprises: an indication of a starting physical random access channel occasion and a number of times that the set of synchronization signal blocks are to be mapped to at least one preamble of the one or more preambles in different physical random access channel occasions. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the mapping comprises: a number of preambles and a number of times that the set of synchronization signal blocks are to be mapped to at least one preamble of the one or more preambles in different physical random access channel occasions. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the mapping comprises a mask indicative of at least one physical random access channel occasion for the apparatus. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein the mapping comprises an indication that the mapping between the set of synchronization signal blocks and at least one preamble of the one or more preambles in the at least one physical random access channel occasion is to be applied after applying the mask. ### Claim 7 An apparatus comprising at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform at least: transmitting, to a user equipment, at least one random access configuration for the user equipment to access to a radio access network, wherein the at least one random access configuration comprises a mapping between a set of synchronization signal blocks and one or more preambles in at least one physical random access channel occasion according to one or more features; and receiving, from the user equipment, at least one preamble of the one or more preambles. ### Claim 8 (depends on 7) The apparatus of claim 7, wherein the one or more features comprise at least one of: coverage enhancement, network slicing, reduced capability, and small data transmission. ### Claim 9 (depends on 7) The apparatus of claim 7, wherein the mapping comprises: an indication of a starting physical random access channel occasion and a number of times that the set of synchronization signal blocks are to be mapped to at least one preamble of the one or more preambles in different physical random access channel occasions. ### Claim 10 (depends on 7) The apparatus of claim 7, wherein the mapping comprises: a number of preambles and a number of times that the set of synchronization signal blocks are to be mapped to at least one preamble of the one or more preambles in different physical random access channel occasions. ### Claim 11 (depends on 7) The apparatus of claim 7, wherein the mapping comprises a mask indicative of at least one physical random access channel occasion for the user equipment. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the mapping comprises an indication that the mapping between the set of synchronization signal blocks and at least one preamble of the one or more preambles in the at least one physical random access channel occasion is to be applied after applying the mask. ### Claim 13 A method comprising: receiving, by a user equipment from a network node in a radio access network, at least one random access configuration for the apparatus to access to the radio access network, wherein the at least one random access configuration comprises a mapping between a set of synchronization signal blocks and one or more preambles in at least one physical random access channel occasion according to one or more features; determining, based on at least one of the one or more features, at least one preamble of the one or more preambles in a physical random access channel occasion corresponding to at least one synchronization signal block in the set of synchronization signal blocks; and transmitting, to the network node, the at least one preamble. ### Claim at position 14 14-16. (canceled)