# US 2018/0324853 A1 · Rach power offset > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324853 A1 - Document ID: US20180324853A1 - Status: Published application - Kind: A1 - Application number: 15/972,056 - Filed: 2018-05-04 - Published: 2018-11-08 - Earliest claimed: 2017-05-04 - Assignees: Ofinno Technologies, LLC - Applicants: Ofinno Technologies, LLC - Inventors: Hyoungsuk Jeon; Esmael Dinan; Alireza Babaei; Kyungmin Park - Web page: https://patentgrep.com/patent/US20180324853A1 ## CPC - H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) - H04B 17/347: {Path loss} - H04W 52/04: Transmission power control [TPC] - H04W 52/325: {Power control of control or pilot channels} - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04B 17/327: Received signal code power [RSCP] - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 52/146: {Uplink power control} - H04W 52/242: {taking into account path loss} - H04W 52/50: at the moment of starting communication in a multiple access environment - 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) - H04B: TRANSMISSION ## Abstract A wireless device receives at least one radio resource control message comprising one or more configuration parameters of a cell. A control order for transmission of a random access preamble is received via the cell. A transmission power is determined for the random access preamble based on a pathloss measurement. When the one or more configuration parameters comprise one or more parameters of a channel state information reference signal (CSI-RS) for the cell: the pathloss measurement is based on the CSI-RS; and the determining the transmission power employs a power offset value indicated by the one or more configuration parameters. When the one or more configuration parameters do not comprise CSI-RS parameters for the cell: the pathloss measurement is based on at least one synchronization signal; and the determining the transmission power does not employ the power offset value. The random access preamble is transmitted based on the transmission power. ## Claims ### Claim 1 A method comprising: receiving, by a wireless device, at least one radio resource control message comprising one or more configuration parameters of a cell; receiving, by the wireless device, a control order for transmission of a random access preamble via the cell; determining, for the random access preamble, a transmission power based on a pathloss measurement, wherein: when the one or more configuration parameters comprise one or more parameters of a channel state information reference signal (CSI-RS) for the cell: the pathloss measurement is based on the CSI-RS; and the determining the transmission power employs a power offset value indicated by the one or more configuration parameters; and when the one or more configuration parameters do not comprise CSI-RS parameters for the cell: the pathloss measurement is based on at least one synchronization signal; and the determining the transmission power does not employ the power offset value; and transmitting the random access preamble based on the transmission power. ### Claim 2 (depends on 1) The method of claim 1, wherein the CSI-RS is a periodic CSI-RS. ### Claim 3 (depends on 1) The method of claim 1, wherein the one or more parameters of the CSI-RS indicate a periodicity of the CSI-RS. ### Claim 4 (depends on 1) The method of claim 1, wherein the one or more parameters of the CSI-RS indicate at least one of one or more CSI-RS subcarriers of resource elements or a CSI-RS sequence. ### Claim 5 (depends on 1) The method of claim 1, wherein the one or more messages comprises at least one of a reference signal power value, a preamble base station received target power, or a configured wireless device transmit power for the cell. ### Claim 6 (depends on 1) The method of claim 1, wherein the transmission power is based on a sum of a preamble base station received target power and a value of the pathloss measurement. ### Claim 7 (depends on 6) The method of claim 6, wherein the value of the pathloss measurement is based on a reference signal power value minus a measured received power value of a reference signal, wherein: when the one or more configuration parameters comprise one or more parameters of the CSI-RS for the cell: the reference signal is the CSI-RS; and when the one or more configuration parameters do not comprise CSI-RS parameters for the cell: the reference signal is at least one synchronization signal. ### Claim 8 (depends on 1) The method of claim 1, wherein the determining the transmission power is further based on the reference signal power value. ### Claim 9 (depends on 1) The method of claim 1, wherein the transmission power employs the value of the pathloss measurement determined based on a received power of the CSI-RS. ### Claim 10 (depends on 1) The method of claim 1, wherein when the one or more configuration parameters comprise one or more parameters of the CSI-RS, the transmitting the random access preamble uses at least one random access channel, wherein the one or more messages indicate: an association between one or more synchronization signals and the CSI-RS; and an association between the at least one random access channel and the one or more synchronization signals. ### Claim 11 A method comprising: receiving, by a wireless device, one or more messages indicating: one or more configuration parameters of a channel state information reference signal (CSI-RS) of a cell; and a power offset value associated with the CSI-RS of the cell; receiving a control order for transmission of a random access preamble via the cell; determining a transmission power for the random access preamble, wherein in response to the wireless device being configured with the CSI-RS for the cell, the transmission power is at least based on the power offset value; and transmitting, by the wireless device, the random access preamble using the transmission power. ### Claim 12 (depends on 11) The method of claim 11, wherein the CSI-RS is a periodic CSI-RS. ### Claim 13 (depends on 11) The method of claim 11, wherein the determining the transmission power for the random access preamble is based on a pathloss measurement. ### Claim 14 (depends on 11) The method of claim 11, wherein the value of the pathloss measurement is based on a reference signal power value minus a measured received power value of a reference signal, wherein: when the one or more configuration parameters comprise one or more parameters of the CSI-RS for the cell: the reference signal is the CSI-RS; and when the one or more configuration parameters do not comprise CSI-RS parameters for the cell: the reference signal is at least one synchronization signal. ### Claim 15 (depends on 11) The method of claim 11, wherein the transmission power is based on a sum of a preamble base station received target power and the value of the pathloss measurement. ### Claim 16 (depends on 11) The method of claim 11, wherein the transmission power employs a value of the pathloss measurement determined based on a received power of the CSI-RS. ### Claim 17 (depends on 11) The method of claim 11, further comprising determining the transmission power for the random access preamble, wherein, in response to the wireless device being not configured with the CSI-RS for the cell: the pathloss measurement is based on at least one synchronization signal; and the determining the transmission power does not employ the power offset value. ### Claim 18 (depends on 11) The method of claim 11, wherein the one or more parameters of the CSI-RS indicate a periodicity of the CSI-RS. ### Claim 19 (depends on 11) The method of claim 11, wherein the one or more parameters of the CSI-RS indicate at least one of one or more CSI-RS subcarriers of resource elements or a CSI-RS sequence. ### Claim 20 (depends on 11) The method of claim 11, wherein when the one or more configuration parameters comprise one or more parameters of the CSI-RS, the transmitting the random access preamble uses at least one random access channel, wherein the one or more messages indicate: an association between one or more synchronization signals and the CSI-RS; and an association between the at least one random access channel and the one or more synchronization signals.