# US 2019/0174550 A1 · Random access method, terminal, and network device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0174550 A1 - Document ID: US20190174550A1 - Status: Published application - Kind: A1 - Application number: 16/268,309 - Filed: 2019-02-05 - Published: 2019-06-06 - Earliest claimed: 2017-11-17 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co.,Ltd. - Inventors: Huang Huang; Mao Yan; Kuandong Gao - Web page: https://patentgrep.com/patent/US20190174550A1 ## CPC - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - 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)} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 56/001: {Synchronization between nodes} - H04W 72/12: Wireless traffic scheduling - H04W 72/0446: Resources in time domain, e.g. slots or frames - 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) ## Abstract This application provides a random access method, a terminal, and a network device. The random access method includes: determining, by a terminal, whether a resource used for random access conflicts with a resource used for receiving a downlink signal; and if the resource used for the random access conflicts with the resource used for the downlink signal, preferentially using the conflicting random access resource for receiving the downlink signal but not for the random access. This avoids a conflict between receiving of the downlink signal and sending of an uplink random access preamble. ## Claims ### Claim 1 A random access method, comprising: receiving information about random access resources from a network device; determining whether there is a random access resource that overlaps with a time resource for receiving a synchronization signal block; and if there is a random access resource overlaps with a time resource for receiving a synchronization signal block, sending a random access preamble to the network device based on the random access resources excluding the overlapping random access resource. ### Claim 2 (depends on 1) The random access method according to claim 1, wherein the determining whether there is a random access resource that overlaps with a time resource for receiving a synchronization signal block, comprises: determining whether there is a symbol for random access that overlaps with a symbol for receiving the synchronization signal block in a slot; if there is a symbol for random access that overlaps with a symbol for receiving the synchronization signal block in the slot, the sending a random access preamble to the network device based on the random access resources excluding the overlapping random access resource, comprising: sending the random access preamble to the network device without using the slot in which the overlapping symbols are located. ### Claim 3 (depends on 1) The random access method according to claim 1, wherein if there is a random access resource that overlaps with a time resource for receiving a synchronization signal block, the method further comprising: determining the random access resource that overlaps with the time resource for receiving the synchronization signal block is unavailable for random access. ### Claim 4 (depends on 1) The random access method according to claim 1, wherein the determining whether there is a random access resource that overlaps with a time resource for receiving a synchronization signal block, comprises: determining whether there is a symbol for random access that overlaps with a symbol for receiving the synchronization signal block in a slot; if there is a symbol that overlaps with a symbol for receiving a synchronization signal block in the slot, the sending a random access preamble to the network device based on the random access resources excluding the overlapping random access resource comprises: sending the random access preamble without using the overlapping symbols in the slot and any symbol that precedes the overlapping symbols in the slot. ### Claim 5 (depends on 1) The random access method according to claim 1, further comprising: determining whether there is a random access resource that overlaps with a time resource for receiving a semi-persistent scheduling signal, if there is a random access resource that overlaps with a time resource for receiving a semi-persistent scheduling signal, not using the overlapping resource for receiving the semi-persistent scheduling signal. ### Claim 6 (depends on 1) The random access method according to claim 1, further comprising: determining whether there is a symbol for random access that overlaps with a symbol for receiving a semi-persistent scheduling signal in a slot; if there is a symbol for random access that overlaps with a symbol for receiving the semi-persistent scheduling signal block in the slot, not using the slot for receiving the semi-persistent scheduling signal in which the overlapping symbols are located. ### Claim 7 (depends on 1) The random access method according to claim 1, further comprising: determining the time resource for receiving the synchronization signal block based on one or more of the following: a slot occupied by the synchronization signal block, an orthogonal frequency division multiplexing (OFDM) symbol occupied by the synchronization signal block, or a guard period. ### Claim 8 (depends on 1) The random access method according to claim 1, wherein the information about random access resources from a network device comprises random access configuration index and the random access preamble subcarrier spacing; the method further comprising: obtain the random access resources based on the random access configuration index and the random access preamble subcarrier spacing. ### Claim 9 An apparatus, comprising: one or more memories configured to store instructions; and one or more processors coupled to the one or more memories and configured to execute the instructions, cause the apparatus to: receive information about random access resources from a network device; determine whether there is a random access resource that overlaps with a time resource for receiving a synchronization signal block; and if there is a random access resource overlaps with a time resource for receiving a synchronization signal block, send a random access preamble to the network device based on the random access resources excluding the overlapping random access resource. ### Claim 10 (depends on 9) The apparatus according to claim 9, the one or more processors are further configured to execute the program instructions, cause the apparatus to: determine whether there is a symbol for random access that overlaps with a symbol for receiving the synchronization signal block in a slot; if there is a symbol for random access that overlaps with a symbol for receiving the synchronization signal block in the slot, send the random access preamble to the network device without using the slot in which the overlapping symbols are located. ### Claim 11 (depends on 9) The apparatus according to claim 9, the one or more processors are further configured to execute the program instructions, cause the apparatus to: determine the random access resource that overlaps with the time resource for receiving the synchronization signal block is unavailable for random access. ### Claim 12 (depends on 9) The apparatus according to claim 9, the one or more processors are further configured to execute the program instructions, cause the apparatus to: determine whether there is a symbol for random access that overlaps with a symbol for receiving the synchronization signal block in a slot; if there is a symbol that overlaps with a symbol for receiving a synchronization signal block in the slot, send the random access preamble without using the overlapping symbols in the slot and any symbol that precedes the overlapping symbols in the slot. ### Claim 13 (depends on 9) The apparatus according to claim 9, the one or more processors are further configured to execute the program instructions, cause the apparatus to: determine whether there is a random access resource that overlaps with a time resource for receiving a semi-persistent scheduling signal, if there is a random access resource that overlaps with a time resource for receiving a semi-persistent scheduling signal, not using the overlapping resource for receiving the semi-persistent scheduling signal. ### Claim 14 (depends on 9) The apparatus according to claim 9, the one or more processors are further configured to execute the program instructions, cause the apparatus to: determine whether there is a symbol for random access that overlaps with a symbol for receiving the semi-persistent scheduling signal in a slot; if there is a symbol for random access that overlaps with a symbol for receiving the semi-persistent scheduling signal block in the slot, not use the slot for receiving the semi-persistent scheduling signal in which the overlapping symbols are located. ### Claim 15 (depends on 9) The apparatus according to claim 9, the one or more processors are further configured to execute the program instructions, cause the apparatus to: determine the time resource for receiving the synchronization signal block based on one or more of the following: a slot for the synchronization signal block, an orthogonal frequency division multiplexing (OFDM) symbol for the synchronization signal block, or a guard period. ### Claim 16 (depends on 9) The apparatus according to claim 9, wherein the information about random access resources from a network device comprises random access configuration index and the random access preamble subcarrier spacing; the one or more processors are further configured to execute the program instructions, cause the apparatus to: obtain the random access resources based on the random access configuration index and the random access preamble subcarrier spacing. ### Claim 17 A random access method for a communications system, comprising: determining at least one actually available random access resource based on time location information for random access resources and time location information for receiving a downlink signal, wherein a time location for the at least one actually available random access resource does not overlap with a time location for receiving the downlink signal; and sending a random access preamble to a network device based on the at least one actually available random access resource. ### Claim 18 (depends on 17) The method according to claim 17, further comprising: receiving a random access configuration index, and obtaining the time location information for the random access resources based on the random access configuration index. ### Claim 19 (depends on 17) The method according to claim 17, further comprising: if it is determined that a time location for a random access resource overlaps with the time location for receiving the downlink signal, sending the random access preamble without using the random access resource whose time location overlaps with the time location for the downlink signal. ### Claim 20 (depends on 17) The method according to claim 17, wherein if it is determined that a time location for a random access resource overlaps with the time location for receiving the downlink signal, the overlapping resource is prioritized for receiving the downlink signal. ### Claim 21 (depends on 17) The method according to claim 17, further comprising: if it is determined that a time location for a random access resource overlaps with the time location for receiving the downlink signal, sending the random access preamble without using any random access resource that precedes the overlapping random access resource in an overlapping slot in which the overlapping random access resource is located. ### Claim 22 (depends on 17) The method according to claim 17, wherein the time location is one or more of the following: an orthogonal frequency division multiplexing (OFDM) symbol, a mini-slot, a slot, a subframe, or a time segment whose duration is H basic time units, wherein H is greater than 0. ### Claim 23 (depends on 17) The method according to claim 17, wherein the downlink signal is one or more of the following: a synchronization signal block, a system information block, remaining minimum system information (RMSI), a new radio system information block 1 (NR SIB1), a new radio system information block 0 (NR SIB0), a reserved downlink signal, a semi-statically configured downlink subframe, a semi-statically configured slot, or a semi-statically configured OFDM symbol. ### Claim 24 An apparatus, comprising: one or more memories configured to store instructions; and one or more processors coupled to the one or more memories and configured to execute the instructions, cause the apparatus to: determine at least one actually available random access resource based on time location information for a random access resource and time location information for receiving a downlink signal, wherein a time location for the at least one actually available random access resource does not overlap with a time location for receiving the downlink signal; and send a random access preamble to a network device based on the at least one actually available random access resource. ### Claim 25 (depends on 24) The apparatus according to claim 24, wherein the one or more processors are further configured to execute the program instructions, cause the apparatus to: receive a random access configuration index, and obtain the time location information for the random access resource based on the random access configuration index. ### Claim 26 (depends on 24) The apparatus according to claim 24, wherein if it is determined that a time location for a random access resource overlaps with the time location for receiving the downlink signal, the overlapping resource is prioritized for receiving the downlink signal. ### Claim 27 (depends on 24) The apparatus according to claim 24, wherein the one or more processors are further configured to execute the program instructions, cause the apparatus to: if it is determined that a time location for a random access resource overlaps with the time location for receiving the downlink signal, send the random access preamble without using the random access resource whose time location overlaps with the time location for the downlink signal. ### Claim 28 (depends on 24) The apparatus according to claim 24, wherein the one or more processors are further configured to execute the program instructions, cause the apparatus to: if it is determined that a time location for a random access resource overlaps with the time location for receiving the downlink signal, sending the random access preamble without using any random access resource that precedes the overlapping random access resource in an overlapping slot in which the overlapping random access resource is located. ### Claim 29 (depends on 24) The apparatus according to claim 24, wherein the time location is one or more of the following: an orthogonal frequency division multiplexing (OFDM) symbol, a mini-slot, a slot, a subframe, or a time segment whose duration is H basic time units, wherein H is greater than 0. ### Claim 30 (depends on 24) The apparatus according to claim 24, wherein the downlink signal is one or more of the following: a synchronization signal block, a system information block, remaining minimum system information (RMSI), a new radio system information block 1 (NR SIB1), a new radio system information block 0 (NR SIB0), a reserved downlink signal, a semi-statically configured downlink subframe, a semi-statically configured slot, or a semi-statically configured OFDM symbol.