# US 12,010,727 B2 · Enhancing RACH operation in new radio under RF exposure requirements > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,010,727 B2 - Document ID: US12010727B2 - Status: Granted - Kind: B2 - Application number: 17/439,710 - Filed: 2020-04-15 - Published: 2022-05-26 - Granted: 2024-06-11 - Earliest claimed: 2019-05-02 - Assignees: Nokia Technologies Oy - Applicants: Nokia Technologies Oy - Inventors: Sami-Jukka Hakola; Jorma Kaikkonen; Timo Koskela; Lars Dalsgaard; Juha Karjalainen; Mihai Enescu - Web page: https://patentgrep.com/patent/US12010727B2 ## CPC - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04W 72/02: Selection of wireless resources by user or terminal - H04B 7/06952: {Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping} - H04B 17/327: Received signal code power [RSCP] - H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range} - H04W 52/42: in systems with time, space, frequency or polarisation diversity - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract A technique of accounting for the difference in required output power reduction or required duty cycle when selecting the RO in addition to the DL RS. Both output power reduction and duty cycle are independently determined by UE itself (i.e., UE needs to be able to determine itself required power backoff and/or duty cycle in order to meet RF exposure requirements). Advantageously, a RACH procedure in which the UE determines both output power reduction and duty cycle independently enables better choices of output power reduction and duty cycle, enhancing data activity and coverage. ## 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 at least to: receive uplink resource information from a network describing a plurality of uplink resources; determine, after receiving the uplink resource information and for at least one of the plurality of uplink resources, restrictions on user equipment resources associated with the at least one of the plurality of uplink resources; select at least one of the plurality of uplink resources based on the restrictions on user equipment resources associated with the at least one of the plurality of uplink resources; and transmit data using the at least one of the plurality of selected uplink resources; wherein the at least one memory and the computer program code, with the at least one processor, configured to select the at least one of the plurality of uplink resources is further configured to select the uplink resource of the plurality of uplink resources for which an adjusted reference signal received power value corresponding to the uplink resource is greater than a threshold value; wherein the adjusted reference signal received power values corresponding to the plurality of uplink resources are all less than the threshold value, and wherein the at least one memory and the computer program code, with the at least one processor, further configured to select the uplink resource of the plurality of uplink resources for which a duty cycle associated with that uplink resources is a maximum. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the plurality of uplink resources includes locations and sizes of a plurality of physical uplink shared channel resources in time and frequency space by which data is to be transmitted to a base station. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the uplink resource information includes a plurality of preambles to be transmitted over a physical random access channel, and wherein the at least one memory and the computer program code, with the at least one processor, configured to select the at least one of the plurality of uplink resources is further configured to perform a random access channel operation to produce a selected preamble and a mapping from the selected preamble to a physical uplink shared channel resource of the plurality of physical uplink shared channel resources. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein a random access channel operation is a four-step random access channel operation. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the at least one memory and the computer program code, with the at least one processor, configured to determine the restrictions on user equipment resources associated with at least one of the plurality of uplink resources is further configured to perform a power determination operation to produce a value of a output power reduction associated with that uplink resource. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the at least one memory and the computer program code, with the at least one processor, configured to determine the restrictions on the user equipment resources associated with at least one of the plurality of uplink resources is further configured to perform a duty cycle determination operation to produce a value of a minimum duty cycle associated with that uplink resource. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the uplink resource information is received with a plurality of downlink reference signals, each of the plurality of downlink reference signals being associated with a respective uplink resource of the plurality of uplink resources, wherein the at least one memory and the computer program code, with the at least one processor, is further configured to perform a power measurement operation on each of the plurality of downlink reference signals to produce a plurality of reference signal received power values, each of the plurality of reference signal received power values corresponding to a respective uplink resource of the plurality of uplink-resources, and wherein the at least one memory and the computer program code, with the at least one processor, configured to select the at least one of the plurality of uplink resources is further configured to: adjust, for each of the plurality of downlink reference signals, the reference signal received power value of the plurality of reference signal received power values to produce an adjusted reference signal received power value corresponding to the reference signal received power value, the adjusted reference signal received power-value being based on the restrictions on the user equipment resources. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the uplink resource information received from the network further includes the threshold value. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the user equipment includes a plurality of antennae, each of the plurality of antennae corresponding to a beam through which a respective downlink reference signal of a plurality of downlink reference beams is delivered to that antennae. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein one of the restrictions on the user equipment resources is an output power reduction, and wherein the determining of the restrictions on user equipment resources associated with at least one of the plurality of uplink resources is performed in response to the user equipment exceeding a maximum power value determined from the output power reduction associated with at least one beam of the plurality of beams. ### Claim 11 (depends on 9) The apparatus of claim 9, wherein the determining of restrictions on the user equipment resources associated with at least one of the plurality of uplink resources is performed in response to the user equipment having a value of a duty cycle less than a minimum duty cycle for at least one beam of the plurality of beams. ### Claim 12 (depends on 9) The apparatus of claim 9, wherein the at least one memory and the computer program code, with the at least one processor, further configured to send a message to a base station, the message including an indication of at least one of the plurality of beams having a power value exceeding a maximum permissible emission. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the message is sent to the base station within a Msg3 of a random access channel procedure. ### Claim 14 (depends on 1) The apparatus of claim 1, wherein the at least one memory and the computer program code, with the at least one processor, configured to select the at least one of the plurality of uplink resources, is further configured to select the uplink resource of the plurality of uplink resources for which a value of a duty cycle corresponding to the uplink resource is less than a threshold value. ### Claim 15 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 at least to: receive uplink resource information from a network describing a plurality of uplink resources; determine, after receiving the uplink resource information and for at least one of the plurality of uplink resources, restrictions on user equipment resources associated with the at least one of the plurality of uplink resources; select at least one of the plurality of uplink resources based on the restrictions on user equipment resources associated with the at least one of the plurality of uplink resources; and transmit data using the at least one of the plurality of selected uplink resources; wherein a subset of an adjusted reference signal received power values corresponding to a respective subset of the plurality of uplink resources are greater than the threshold value, and wherein the at least one memory and the computer program code, with the at least one processor, further configured to select the uplink resource of the subset of the plurality of uplink resources for which the value of a duty cycle associated with that uplink resource is a maximum; wherein the at least one memory and the computer program code, with the at least one processor, configured to select the at least one of the plurality of uplink resources is further configured to select the uplink resource of the plurality of uplink resources for which an adjusted reference signal received power value corresponding to the uplink resource is greater than a threshold value. ### Claim 16 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 at least to: receive uplink resource information from a network describing a plurality of uplink resources; determine, after receiving the uplink resource information and for at least one of the plurality of uplink resources, restrictions on user equipment resources associated with the at least one of the plurality of uplink resources; select at least one of the plurality of uplink resources based on the restrictions on user equipment resources associated with the at least one of the plurality of uplink resources; and transmit data using the at least one of the plurality of selected uplink resources; wherein a subset of an adjusted reference signal received power values corresponding to a respective subset of the plurality of uplink resources are greater than the threshold value, and wherein the at least one memory and the computer program code, with the at least one processor, further configured to generate a priority ranking of the subset of the plurality of uplink resources in descending order based on a value of a duty cycle associated with that uplink resource; wherein the at least one memory and the computer program code, with the at least one processor, configured to select the at least one of the plurality of uplink resources is further configured to select the uplink resource of the plurality of uplink resources for which an adjusted reference signal received power value corresponding to the uplink resource is greater than a threshold value.