# US 11,122,631 B2 · Link recovery in wireless communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,122,631 B2 - Document ID: US11122631B2 - Status: Granted - Kind: B2 - Application number: 17/247,374 - Filed: 2020-12-09 - Published: 2021-04-08 - Granted: 2021-09-14 - Earliest claimed: 2018-08-07 - Assignees: Zte Corporation - Applicants: ZTE Corporation - Inventors: Bo Gao; Yijian Chen; Shujuan Zhang; Zhaohua Lu - Web page: https://patentgrep.com/patent/US11122631B2 ## CPC - H04W 76/19: Connection re-establishment - H03M 13/15: Cyclic codes, i.e. cyclic shifts of codewords produce other codewords, e.g. codes defined by a generator polynomial, Bose-Chaudhuri-Hocquenghem [BCH] codes (H03M13/17 takes precedence) - H04B 7/06964: {Re-selection of one or more beams after beam failure} - 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 72/23: 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 - 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) - H03M: CODING; DECODING; CODE CONVERSION IN GENERAL (using fluidic means F15C4/00; optical analogue/digital converters G02F7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A wireless communication method includes transmitting, by a first communication node, a first type of random access preamble, monitoring, by the first communication node, a link recovery confirmation information, performing, by the first communication node, after meeting a first type of condition, and the first type of condition includes detecting the link recovery confirmation information, an operation including performing a transmission on an outbound channel to a second communication node using a spatial filter determined by the first type of random access preamble. ## Claims ### Claim 1 A wireless communication method, comprising: performing, by a user device, a random access preamble transmission to a network node; monitoring, by the user device, a downlink control information with a cyclic redundancy check (CRC) scrambled by a first type of radio network temporary identifier; and performing, by the user device after detecting the downlink control information with the CRC scrambled by the first type of radio network temporary identifier, a transmission on a channel using a same spatial filter as that for the random access preamble transmission, wherein a target power associated with the transmission on the channel is determined based on a specific index value indicating a target power in a target power set, and wherein a closed loop power control of the channel has the specific index value, the specific index value being equal to zero. ### Claim 2 (depends on 1) The method of claim 1, wherein a cell of the random access preamble transmission is same as a cell of the channel. ### Claim 3 (depends on 1) The method of claim 1, wherein the transmission on the channel is performed until a reconfiguration or activation of a spatial relation associated with the channel. ### Claim 4 (depends on 1) The method of claim 1, wherein a reference signal of a path loss estimation associated with the channel is based on a downlink reference signal with an index qnew provided by higher layer. ### Claim 5 (depends on 1) The method of claim 1, wherein the closed loop power equals to a ramp-up value associated with the random access preamble transmission plus the value indicated by a transmission power command (TPC) in one downlink control information. ### Claim 6 A wireless communication method, comprising: receiving, by a network node, a random access preamble transmission from a user device; transmitting a downlink control information with cyclic redundancy check (CRC) scrambled by a first type of radio network temporary identifier to the user device; and receiving, by the network node in response to the downlink indictor with the CRC scrambled by the first type of radio network temporary identifier, a transmission on a channel using a same spatial filter as that for the random access preamble transmission, wherein a target power associated with the transmission on the channel is determined based on a specific index value indicating a target power in a target power set, and wherein a closed loop power control of the channel has the specific index value, the specific index value being equal to zero. ### Claim 7 (depends on 6) The method of claim 6, wherein a cell of the random access preamble transmission is same as a cell of the channel. ### Claim 8 (depends on 6) The method of claim 6, wherein a reference signal of a path loss estimation associated with the channel is based on a downlink reference signal with an index qnew provided by higher layer. ### Claim 9 (depends on 6) The method of claim 6, wherein the closed loop power control of the channel equals to a ramp-up value associated with the random access preamble transmission plus the value indicated by a transmission power command (TPC) in one downlink control information. ### Claim 10 An apparatus comprising: a processor, wherein the processor is configured to: perform a random access preamble transmission to a network node; monitor a downlink control information with a cyclic redundancy check (CRC) scrambled by a first type of radio network temporary identifier; and perform, after detecting the downlink control information with the cyclic redundancy check (CRC) scrambled by the first type of radio network temporary identifier, a transmission on a channel using a same spatial filter as that for the random access preamble transmission, wherein a target power associated with the transmission on the channel is determined based on a specific index value indicating a target power in a target power set, and wherein a closed loop power control of the channel has the specific index value, the specific index value being equal to zero. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein a cell of the random access preamble transmission is same as a cell of the channel. ### Claim 12 (depends on 10) The apparatus of claim 10, wherein the processor is configured to perform the transmission on the channel until a reconfiguration or activation of a spatial relation associated with the channel. ### Claim 13 (depends on 10) The apparatus of claim 10, wherein a reference signal of a path loss estimation associated with the channel is based on a downlink reference signal with an index qnew provided by higher layer. ### Claim 14 (depends on 10) The apparatus of claim 10, wherein the closed loop power control of the channel equals to a ramp-up value associated with the random access preamble transmission plus the value indicated by a transmission power command (TPC) in one downlink control information. ### Claim 15 An apparatus comprising: a processor, wherein the processor is configured to: receive a random access preamble transmission from a user device; transmit a downlink control information with cyclic redundancy check (CRC) scrambled by a first type of radio network temporary identifier to the user device; and receive, in response the downlink control information with the CRC scrambled by the first type of radio network temporary identifier, a transmission on a channel using a same spatial filter as that for the random access preamble transmission, wherein a target power associated with the transmission on the channel is determined based on a specific index value indicating a target power in a target power set, and wherein a closed loop power control of the channel has the specific index value, the specific index value being equal to zero. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein a cell of the random access preamble transmission is same as a cell of the channel. ### Claim 17 (depends on 15) The apparatus of claim 15, wherein a reference signal of a path loss estimation associated with the channel is based on a downlink reference signal with an index qnew provided by higher layer. ### Claim 18 (depends on 15) The apparatus of claim 15, wherein the closed loop power control of the channel equals to a ramp-up value associated with the random access preamble transmission plus the value indicated by a transmission power command (TPC) in one downlink control information.