# US 10,455,468 B2 · Mobility enhancements for high speed scenarios > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,455,468 B2 - Document ID: US10455468B2 - Status: Granted - Kind: B2 - Application number: 15/236,251 - Filed: 2016-08-12 - Published: 2017-02-16 - Granted: 2019-10-22 - Earliest claimed: 2015-08-14 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Valentin Alexandru Gheorghiu; Masato Kitazoe - Web page: https://patentgrep.com/patent/US10455468B2 ## CPC - H04W 36/0088: {Scheduling hand-off measurements} - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04W 36/302: {due to low signal strength} - H04W 52/0209: {in terminal devices} - H04W 52/0254: {detecting a user operation or a tactile contact or a motion of the device} - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04W 36/08: Reselecting an access point - H04W 36/144: {over a different radio air interface technology} - H04W 88/02: Terminal devices - H04W 88/08: Access point devices - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract Techniques are provided for adaptively changing a periodicity of measuring signal characteristics for a UE in a relatively high speed environment based on one or more signal characteristics being outside of a threshold. Periodicity of measuring signal characteristics may be made directly by changing an interval at which measurements are taken. In certain examples, periodicity of measuring signal characteristics may be made indirectly by changing the length of a discontinuous reception (DRX) cycle. Some techniques provide one or more radio link monitoring (RLM) parameters may be modified based on a determination that a UE is in a high speed environment or measured signal characteristics are outside of a threshold. ## Claims ### Claim 1 A method for wireless communication at a base station, comprising: identifying a first time interval for performing one or more signal characteristic measurements; identifying a second time interval for performing the one or more signal characteristic measurements, wherein the second time interval is shorter than the first time interval; identifying a first reference signal received power (RSRP) measurement at a first time and a second RSRP measurement at a second time, wherein the second time is later than the first time; identifying a difference between the first RSRP measurement and the second RSRP measurement; setting a mobility parameter threshold for changing from the first time interval to the second time interval based at least in part on the difference between the second RSRP measurement and the first RSRP measurement satisfying a threshold; and signaling a user equipment (UE) to indicate the mobility parameter threshold for use by the UE in changing from the first time interval to the second time interval for performing the one or more signal characteristic measurements. ### Claim 2 (depends on 1) The method of claim 1, wherein the first time interval and second time interval correspond to different periodicities of a discontinuous reception (DRX) cycle. ### Claim 3 (depends on 1) The method of claim 1, wherein the one or more signal characteristic measurements comprise one or more reference signal receive power (RSRP) measurements. ### Claim 4 (depends on 1) The method of claim 1, wherein the one or more signal characteristic measurements comprise one or more measurements associated with a radio link monitoring (RLM) process. ### Claim 5 (depends on 4) The method of claim 4, wherein the RLM process comprises evaluating a link quality of a link with a serving base station to trigger a connection re-establishment following a determination that the link quality is below a certain threshold. ### Claim 6 (depends on 1) The method of claim 1, wherein the mobility parameter threshold is based at least in part on a reference signal received power (RSRP) threshold. ### Claim 7 (depends on 1) The method of claim 1, wherein the mobility parameter threshold is based at least in part on one or more of a speed of the UE, or a number of visited cells within a time period. ### Claim 8 (depends on 1) The method of claim 1, wherein the changing from the first time interval to the second time interval is performed autonomously by the UE. ### Claim 9 (depends on 8) The method of claim 8, further comprising: receiving a signal from the UE that the second time interval is being used for performing the one or more signal characteristic measurements. ### Claim 10 (depends on 8) The method of claim 8, further comprising: receiving a signal from the UE that a discontinuous reception (DRX) cycle periodicity is changed at the UE. ### Claim 11 (depends on 9) The method of claim 9, further comprising: receiving a signal from the UE indicating one or more of the signal characteristic measurements; and triggering a handover from a serving base station to a target base station responsive to the one or more signal characteristic measurements. ### Claim 12 A method for wireless communication at a user equipment (UE), comprising: identifying a first time interval for performing one or more signal characteristic measurements; determining a first reference signal received power (RSRP) measurement at a first time and a second RSRP measurement at a second time, wherein the second time is later than the first time; determining a difference between the first RSRP measurement and the second RSRP measurement; determining that a mobility parameter associated with the UE is outside of a mobility parameter threshold, wherein the mobility parameter threshold is based at least in part on the difference between the second RSRP measurement and the first RSRP measurement satisfying a threshold; and changing, responsive to the determining, to a second time interval for performing the one or more signal characteristic measurements, wherein the second time interval is shorter than the first time interval. ### Claim 13 (depends on 12) The method of claim 12, wherein changing to a second time interval comprises changing a discontinuous reception (DRX) cycle from a first periodicity corresponding to the first time interval to a second periodicity corresponding to the second time interval. ### Claim 14 (depends on 12) The method of claim 12, wherein the one or more signal characteristic measurements comprise one or more reference signal receive power (RSRP) measurements. ### Claim 15 (depends on 12) The method of claim 12, wherein the one or more signal characteristic measurements comprise one or more measurements associated with a radio link monitoring (RLM) process. ### Claim 16 (depends on 15) The method of claim 15, wherein the RLM process comprises evaluating a link quality of a link with a serving base station to trigger a connection re-establishment following a determination that the link quality is below a RLM threshold. ### Claim 17 (depends on 12) The method of claim 12, wherein the changing from the first time interval to the second time interval is performed autonomously by the UE. ### Claim 18 (depends on 17) The method of claim 17, further comprising: transmitting a signal to a serving base station that the second time interval is being used for performing the one or more signal characteristic measurements. ### Claim 19 (depends on 17) The method of claim 17, further comprising: transmitting a signal to a serving base station that a discontinuous reception (DRX) cycle periodicity is changed at the UE. ### Claim 20 (depends on 12) The method of claim 12, further comprising: triggering a handover from a serving base station to a target base station responsive to the one or more signal characteristic measurements. ### Claim 21 (depends on 12) The method of claim 12, wherein the mobility parameter threshold is based at least in part on one or more of a speed of the UE, or a number of visited cells within a time period. ### Claim 22 (depends on 12) The method of claim 12, wherein the mobility parameter threshold, the first time interval, and the second time interval are received in signaling from a base station. ### Claim 23 (depends on 12) The method of claim 12, further comprising: receiving signaling from a serving base station indicating the mobility parameter threshold; and performing the identifying, determining, and changing responsive to the signaling. ### Claim 24 An apparatus for wireless communication, comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: identify a first time interval for performing one or more signal characteristic measurements; determine a first reference signal received power (RSRP) measurement at a first time and a second RSRP measurement at a second time, wherein the second time is later than the first time; determine a difference between the first RSRP measurement and the second RSRP measurement; determine that a mobility parameter is outside of a mobility parameter threshold, wherein the mobility parameter threshold is based at least in part on the difference between the second RSRP measurement and the first RSRP measurement satisfying a threshold; and change, responsive to the determining, to a second time interval for performing the one or more signal characteristic measurements, wherein the second time interval is shorter than the first time interval. ### Claim 25 (depends on 24) The apparatus of claim 24, wherein the mobility parameter threshold, the first time interval, and the second time interval are received in signaling from a base station. ### Claim 26 (depends on 24) The apparatus of claim 24, wherein the instructions are further operable to cause the apparatus to: receive signaling from a serving base station indicating the mobility parameter threshold; and perform the identifying, determining, and changing responsive to the signaling. ### Claim 27 (depends on 24) The apparatus of claim 24, wherein the mobility parameter threshold is based at least in part on one or more of a speed of a user equipment (UE), or a number of visited cells within a time period. ### Claim 28 An apparatus for wireless communication, comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: identify a first time interval for performing one or more signal characteristic measurements; identify a second time interval for performing the one or more signal characteristic measurements, wherein the second time interval is shorter than the first time interval; identify a first reference signal received power (RSRP) measurement at a first time and a second RSRP measurement at a second time, wherein the second time is later than the first time; identify a difference between the first RSRP measurement and the second RSRP measurement; set a mobility parameter threshold for changing from the first time interval to the second time interval based at least in part on the difference between the second RSRP measurement and the first RSRP measurement satisfying a threshold; and signal a user equipment (UE) to indicate the mobility parameter threshold for use by the UE in changing from the first time interval to the second time interval for performing the one or more signal characteristic measurements. ### Claim 29 (depends on 28) The apparatus of claim 28, wherein the one or more signal characteristic measurements comprise one or more reference signal receive power (RSRP) measurements. ### Claim 30 (depends on 28) The apparatus of claim 28, wherein the mobility parameter threshold is based at least in part on one or more of a speed of the UE, or a number of visited cells within a time period.