# US 10,772,015 B2 · Packet-switched wireless communication for link budget limited wireless devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,772,015 B2 - Document ID: US10772015B2 - Status: Granted - Kind: B2 - Application number: 16/037,732 - Filed: 2018-07-17 - Published: 2018-11-08 - Granted: 2020-09-08 - Earliest claimed: 2015-05-18 - Assignees: Apple Inc. - Applicants: Apple Inc. - Inventors: Tarik Tabet; Farouk Belghoul; Samy Khay-Ibbat; Sarma V. Vangala; Rafael L. Rivera-Barreto; David Boettger; Awais M. Hussain; Syed Aon Mujtaba - Web page: https://patentgrep.com/patent/US10772015B2 ## CPC - H04W 36/0085: {Hand-off measurements} - H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] - H04B 17/382: for resource allocation, admission control or handover - H04W 36/00837: {Determination of triggering parameters for hand-off} - H04W 36/302: {due to low signal strength} - H04W 36/0058: {Transmission of hand-off measurement information, e.g. measurement reports} - 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 This disclosure relates to techniques for a link budget limited UE to improve communications performance with a cellular network. The UE may perform signal to interference noise ratio (SINR) measurements and use these measurements to adjust a received signal power value that is provided to the cellular network as a received signal power measurement. The UE may generate the received signal power value based at least in part on the SINR measurement in order to reduce the likelihood of handover when the UE has good SINR but poor received signal power. The UE may also provide preferred configuration information to the base station which enhances the performance of the UE when link budget limited. The configuration information may specify one or more parameter values designed to provide improved performance for a link budget limited device. ## Claims ### Claim 1 A user equipment (UE), comprising: at least one antenna; a radio coupled to the at least one antenna for performing wireless cellular communications; and at least one processor coupled to the radio, wherein the at least one processor is configured to: indicate to a cellular base station that the UE is link budget limited; provide configuration information to the cellular base station via an index value during random access channel (RACH) communication, wherein the configuration information specifies a set of one or more parameter values designed to provide improved performance for a link budget limited device, wherein the one or more parameter values are usable to configure the UE, wherein the set of one or more parameters includes timer values for link budget limited devices, including: a T300 timer value, a T301 timer value, and a T310 timer value for radio link failure; and receive communication from the cellular base station based on the set of one or more parameter values. ### Claim 2 (depends on 1) The UE of claim 1, wherein said indicating that the UE is link budget limited and said providing the configuration information are performed in a same communication. ### Claim 3 (depends on 1) The UE of claim 1, wherein the index is one of a plurality of indices, wherein each index references a respective set of one or more parameter values, and wherein the sets include one or more sets for link budget limited UEs and one or more sets for non-link budget limited UEs. ### Claim 4 (depends on 3) The UE of claim 3, wherein the sets further include one or more sets for UEs having different degrees of link budget constraints. ### Claim 5 (depends on 1) The UE of claim 1, wherein the set of one or more parameters correspond to one or more RACH parameters. ### Claim 6 (depends on 5) The UE of claim 5, wherein the set of one or more parameters includes preambleTransMax. ### Claim 7 An apparatus, comprising: one or more processors, wherein the one or more processors are configured to cause a user equipment (UE) to: provide configuration information to a cellular base station via an index value during random access channel (RACH) communication, wherein the configuration information specifies a set of one or more parameter values designed to provide improved performance for a link budget limited device, wherein the one or more parameter values are usable to configure the UE, wherein the set of one or more parameters includes timer values for link budget limited devices, including: a T300 timer value, a T301 timer value, and a T310 timer value for radio link failure; and receive communication from the cellular base station based on the set of one or more parameter values. ### Claim 8 (depends on 7) The apparatus of claim 7, wherein said providing the configuration information is performed in a same communication to indicate to the cellular base station that the UE is link budget limited. ### Claim 9 (depends on 7) The apparatus of claim 7, wherein the index is one of a plurality of indices, wherein each index references a respective set of one or more parameter values, and wherein the sets include one or more sets for link budget limited UEs and one or more sets for non-link budget limited UEs. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the sets further include one or more sets for UEs having different degrees of link budget constraints. ### Claim 11 (depends on 7) The apparatus of claim 7, wherein the set of one or more parameters correspond to one or more RACH parameters. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the set of one or more parameters includes preambleTransMax. ### Claim 13 A method, comprising: at a user equipment (UE): providing configuration information to a cellular base station via an index value during random access channel (RACH) communication, wherein the configuration information specifies a set of one or more parameter values designed to provide improved performance for a link budget limited device, wherein the one or more parameter values are usable to configure the UE, wherein the set of one or more parameters includes timer values for link budget limited devices, including: a T300 timer value, a T301 timer value, and a T310 timer value for radio link failure; and receiving communication from the cellular base station based on the set of one or more parameter values. ### Claim 14 (depends on 13) The method of claim 13, wherein said providing the configuration information is performed in a same communication to indicate to the cellular base station that the UE is link budget limited. ### Claim 15 (depends on 13) The method of claim 13, wherein the index is one of a plurality of indices, wherein each index references a respective set of one or more parameter values, and wherein the sets include one or more sets for link budget limited UEs and one or more sets for non-link budget limited UEs. ### Claim 16 (depends on 13) The method of claim 13, wherein the set of one or more parameters correspond to one or more RACH parameters. ### Claim 17 (depends on 16) The method of claim 16, wherein the set of one or more parameters includes preambleTransMax.