# US 12,225,594 B2 · Configuring random access channels for wireless communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,594 B2 - Document ID: US12225594B2 - Status: Granted - Kind: B2 - Application number: 17/726,213 - Filed: 2022-04-21 - Published: 2022-08-04 - Granted: 2025-02-11 - Earliest claimed: 2017-10-02 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget Lm Ericsson (Publ) - Inventors: Johan Axnäs; Henrik Sahlin - Web page: https://patentgrep.com/patent/US12225594B2 ## CPC - H04W 74/085: {collision avoidance} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 74/004: {in the uplink, i.e. towards network} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 56/00: Synchronisation arrangements - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract According to some embodiments, a method for use in a wireless communication network includes a wireless device receiving, from a network, a configuration corresponding to a Physical Random Access Channel (PRACH). The wireless device receives, from the network via Radio Resource Control (RRC) signaling, a bitmap that provides an indication of time locations corresponding to synchronization signal (SS) blocks. The wireless device determines, based on the configuration and the bitmap, a time slot that does not overlap with the time locations to perform a PRACH transmission during the determined time slot. ## Claims ### Claim 1 A method performed by a wireless device operating in an unpaired spectrum, the method comprising: receiving, from a network, a configuration corresponding to a Physical Random Access Channel (PRACH); receiving, from the network via Radio Resource Control (RRC) signaling, a bitmap that provides an indication of time locations corresponding to synchronization signal (SS) blocks of an SS burst set transmitted by the network; restricting at least one PRACH transmission during at least one of the time locations; determining, based on the configuration and the bitmap, a time slot between the time locations that does not overlap with the time locations; and performing a PRACH transmission during the time slot. ### Claim 2 (depends on 1) The method of claim 1, wherein the PRACH transmission comprises a random access channel preamble. ### Claim 3 (depends on 1) The method of claim 1, wherein the configuration comprises a configuration table that indicates slots corresponding to random access channel allocation. ### Claim 4 (depends on 1) The method of claim 1, wherein the configuration comprises a configuration table that indicates start positions corresponding to random access channel allocation. ### Claim 5 (depends on 1) The method of claim 1, wherein the bitmap indicates a plurality of groups of SS blocks, each group comprising a plurality of consecutive SS blocks. ### Claim 6 (depends on 5) The method of claim 5, wherein the bitmap further indicates which SS blocks in each group are transmitted. ### Claim 7 A non-transitory computer readable medium having stored thereon computer readable program code executable to cause a wireless device to perform operations comprising: receiving, from a network, a configuration corresponding to a Physical Random Access Channel (PRACH); receiving, from the network via Radio Resource Control (RRC) signaling, a bitmap that provides an indication of time locations corresponding to synchronization signal (SS) blocks of an SS burst set transmitted by the network; restricting at least one PRACH transmission during the time locations; determining, based on the configuration and the bitmap, a time slot between the time locations that does not overlap with the time locations; and performing a PRACH transmission during the time slot. ### Claim 8 (depends on 7) The non-transitory computer readable medium of claim 7, wherein the PRACH transmission comprises a random access channel preamble. ### Claim 9 (depends on 7) The non-transitory computer readable medium of claim 7, wherein the configuration comprises a configuration table that indicates slots corresponding to random access channel allocation. ### Claim 10 (depends on 7) The non-transitory computer readable medium of claim 7, wherein the configuration comprises a configuration table that indicates start positions corresponding to random access channel allocation. ### Claim 11 (depends on 7) The non-transitory computer readable medium of claim 7, wherein the bitmap indicates a plurality of groups of SS blocks, each group comprising a plurality of consecutive SS blocks. ### Claim 12 (depends on 11) The non-transitory computer readable medium of claim 11, wherein the bitmap further indicates which SS blocks in each group are transmitted. ### Claim 13 A system comprising: a non-transitory memory; and processing circuitry coupled to the non-transitory memory and configured to read instructions from the non-transitory memory to cause the system to perform operations comprising: receiving, from a network, a configuration corresponding to a Physical Random Access Channel (PRACH); receiving, from the network via Radio Resource Control (RRC) signaling, a bitmap that provides an indication of time locations corresponding to synchronization signal (SS) blocks of an SS burst set transmitted by the network; restricting at least one PRACH transmission during the time locations; determining, based on the configuration and the bitmap, a time slot between the time locations that does not overlap with the time locations; and performing a PRACH transmission during the time slot. ### Claim 14 (depends on 13) The system of claim 13, wherein the PRACH transmission comprises a random access channel preamble. ### Claim 15 (depends on 13) The system of claim 13, wherein the configuration comprises a configuration table that indicates slots corresponding to random access channel allocation. ### Claim 16 (depends on 13) The system of claim 13, wherein the configuration comprises a configuration table that indicates start positions corresponding to random access channel allocation. ### Claim 17 (depends on 13) The system of claim 13, wherein the bitmap indicates a plurality of groups of SS blocks, each group comprising a plurality of consecutive SS blocks, and wherein the bitmap further indicates which SS blocks in each group are transmitted.