# US 2023/0056527 A1 · Method And Apparatus Of Physical Random Access Channel Timing Advance Operation In Non-Terrestrial Network Communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0056527 A1 - Document ID: US20230056527A1 - Status: Published application - Kind: A1 - Application number: 17/796,541 - Filed: 2021-02-05 - Published: 2023-02-23 - Earliest claimed: 2020-02-05 - Assignees: MediaTek Singapore Pte. Ltd. - Applicants: MediaTek Singapore Pte. Ltd. - Inventors: Abdelkader Medles; Gilles Charbit; Chiao-Yao Chuang - Web page: https://patentgrep.com/patent/US20230056527A1 ## CPC - H04W 56/0045: {compensating for timing error by altering transmission time} - H04B 7/1851: {Systems using a satellite or space-based relay (H04B7/18508, H04B7/18521 take precedence; providing specific services H04B7/18523 - H04B7/18576)} - H04W 56/003: {Arrangements to increase tolerance to errors in transmission or reception timing} - H04W 56/0065: {using measurement of signal travel time} - H04W 56/009: {Closed loop measurements} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0836: with 2-step access - 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 Various solutions for physical random access channel (PRACH) timing advance operation and PRACH configurations with respect to user equipment and network apparatus are described. An apparatus may determine a propagation delay between the apparatus and a network node. The apparatus may determine a pre-compensation timing margin. The apparatus may perform a timing advance pre-compensation according to the propagation delay and the pre-compensation timing margin. The apparatus may transmit an uplink signal by applying the timing advance pre-compensation. ## Claims ### Claim 1 A method, comprising: determining, by a processor of an apparatus, a propagation delay between the apparatus and a network node; determining, by the processor, a pre-compensation timing margin; performing, by the processor, a timing advance pre-compensation according to the propagation delay and the pre-compensation timing margin; and transmitting, by the processor, an uplink signal by applying the timing advance pre-compensation. ### Claim 2 (depends on 1) The method of claim 1, wherein the pre-compensation timing margin is applied to avoid an overcompensation on the uplink signal. ### Claim 3 (depends on 1) The method of claim 1, wherein the pre-compensation timing margin is a pre-determined value or signaled by the network node. ### Claim 4 (depends on 1) The method of claim 1, further comprising: determining, by the processor, a round trip time between the apparatus and the network node according to the propagation delay. ### Claim 5 (depends on 4) The method of claim 4, wherein the transmitting comprises transmitting the uplink signal by a timing advance of the round trip time minus the pre-compensation timing margin. ### Claim 6 (depends on 4) The method of claim 4, further comprising: receiving, by the processor, a timing advance command from the network node; and updating, by the processor, the timing advance according to the timing advance command received from the network node. ### Claim 7 (depends on 4) The method of claim 4, further comprising: calculating, by the processor, an updated propagation delay; and updating, by the processor, the timing advance according to the updated propagation delay received from the network node. ### Claim 8 A method, comprising: configuring, by a processor of an apparatus, a first set of physical random access channel (PRACH) configuration to a first set of user equipment (UE); configuring, by the processor, a second set of PRACH configuration to a second set of UE; and receiving, by the processor, a RACH preamble signal according to the first set of PRACH configuration and the second set of PRACH configuration, wherein the first set of UE comprises a timing advance pre-compensation capability, and wherein the second set of UE comprises no timing advance pre-compensation capability. ### Claim 9 (depends on 8) The method of claim 8, wherein the first set of PRACH configuration and the second set of PRACH configuration comprise different sets of RACH preamble occasions. ### Claim 10 (depends on 8) The method of claim 8, wherein the first set of PRACH configuration and the second set of PRACH configuration comprise different sizes of overheads or radio resources. ### Claim 11 An apparatus, comprising: a transceiver which, during operation, wirelessly communicates with a network node of a wireless network; and a processor communicatively coupled to the transceiver such that, during operation, the processor performs operations comprising: determining a propagation delay between the apparatus and a network node; determining a pre-compensation timing margin; performing a timing advance pre-compensation according to the propagation delay and the pre-compensation timing margin; and transmitting, via the transceiver, an uplink signal by applying the timing advance pre-compensation. ### Claim 12 (depends on 11) The apparatus of claim 11, wherein the pre-compensation timing margin is applied to avoid an overcompensation on the uplink signal. ### Claim 13 (depends on 11) The apparatus of claim 11, wherein the pre-compensation timing margin is a pre-determined value or signaled by the network node. ### Claim 14 (depends on 11) The apparatus of claim 11, wherein, during operation, the processor further performs operations comprising: determining a round trip time between the apparatus and the network node according to the propagation delay. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein, in transmitting the uplink signal, the processor transmits the uplink signal by a timing advance of the round trip time minus the pre-compensation timing margin. ### Claim 16 (depends on 14) The apparatus of claim 14, wherein, during operation, the processor further performs operations comprising: receiving, via the transceiver, a timing advance command from the network node; and updating the timing advance according to the timing advance command received from the network node. ### Claim 17 (depends on 14) The apparatus of claim 14, wherein, during operation, the processor further performs operations comprising: calculating an updated propagation delay; and updating the timing advance according to the updated propagation delay received from the network node. ### Claim 18 An apparatus, comprising: a transceiver which, during operation, wirelessly communicates with a plurality of user equipment (UE) of a wireless network; and a processor communicatively coupled to the transceiver such that, during operation, the processor performs operations comprising: configuring a first set of physical random access channel (PRACH) configuration to a first set of UE; configuring a second set of PRACH configuration to a second set of UE; and receiving, via the transceiver, a RACH preamble signal according to the first set of PRACH configuration and the second set of PRACH configuration, wherein the first set of UE comprises a timing advance pre-compensation capability, and wherein the second set of UE comprises no timing advance pre-compensation capability. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the first set of PRACH configuration and the second set of PRACH configuration comprise different sets of RACH preamble occasions. ### Claim 20 (depends on 18) The apparatus of claim 18, wherein the first set of PRACH configuration and the second set of PRACH configuration comprise different sizes of overheads or radio resources.