# US 10,873,974 B2 · Preamble sequence configuration method, user equipment, and access network device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,974 B2 - Document ID: US10873974B2 - Status: Granted - Kind: B2 - Application number: 16/258,097 - Filed: 2019-01-25 - Published: 2019-05-23 - Granted: 2020-12-22 - Earliest claimed: 2016-07-26 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Guijie Wang; Jian Wang; Meixin Lin - Web page: https://patentgrep.com/patent/US10873974B2 ## CPC - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04L 1/0038: {Blind format detection (for detection of modulation format H04L27/0012)} - H04L 1/0061: {Error detection codes} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 28/02: Traffic management, e.g. flow control or congestion control - H04W 48/16: Discovering, processing access restriction or access information - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/0466: {the resource being a scrambling code} - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 88/023: {with message or information receiving capability} - H04L 5/0016: {Time-frequency-code} - 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 preamble sequence configuration method, user equipment, and an access network device. The method in embodiments of this application includes: determining, by an access network device, preamble sequence information, where the preamble sequence information includes a message indicating a quantity of preamble sequences; and sending, by the access network device, the preamble sequence information to user equipment, where the preamble sequence information is used by the user equipment for random access. ## Claims ### Claim 1 A preamble sequence configuration method, comprising: determining, by an access network device, preamble sequence information, wherein the preamble sequence information comprises a message indicating a quantity of preamble sequences, the preamble sequences are across a time domain, a frequency domain, and a code domain in a preamble sequence space, and the preamble sequence space further comprises a plurality of layers of code domain space in the code domain, and wherein determining the preamble sequence information comprises determining space level information that indicates a quantity of code domain space layers of the preamble sequence space; including, by the access network device, the space level information in the preamble sequence information; and sending, by the access network device, the preamble sequence information to user equipment, wherein the preamble sequence information comprises the space level information and is used by the user equipment for random access. ### Claim 2 (depends on 1) The preamble sequence configuration method according to claim 1, wherein the quantity of preamble sequences is a product of the quantity of code domain space layers of preamble sequence space and a quantity of preamble sequences in a layer of time-frequency resource. ### Claim 3 (depends on 1) The preamble sequence configuration method according to claim 1, wherein including, by the access network device, the space level information in the preamble sequence information and sending, by the access network device, the preamble sequence information to user equipment comprise: generating, by the access network device, a cyclic redundancy check (CRC) code based on the space level information; performing, by the access network device, check processing on a master system information block (MIB) based on the CRC code; and sending, by the access network device over a physical broadcast channel (PBCH), the MIB that has undergone the check processing. ### Claim 4 (depends on 1) The preamble sequence configuration method according to claim 1, wherein including, by the access network device, the space level information in the preamble sequence information and sending, by the access network device, the preamble sequence information to user equipment comprise: generating, by the access network device, a scrambling code sequence based on the space level information; performing, by the access network device, scrambling processing on a MIB based on the scrambling code sequence; and sending, by the access network device over a PBCH, the MIB that has undergone scrambling processing. ### Claim 5 (depends on 1) The preamble sequence configuration method according to claim 1, wherein including, by the access network device, the space level information in the preamble sequence information and sending, by the access network device, the preamble sequence information to user equipment comprise: adding, by the access network device, the space level information in the preamble sequence information to a system information block (SIB); and sending, by the access network device, the SIB over a physical downlink shared channel (PDSCH). ### Claim 6 (depends on 5) The preamble sequence configuration method according to claim 5, wherein the preamble sequence information further comprises time-frequency resource information, and the time-frequency resource information indicates a time-frequency resource across the time domain, and the frequency domain occupied by the preamble sequence space on a physical random access channel (PRACH); and the sending, by the access network device, the preamble sequence information to user equipment further comprises: adding, by the access network device, the time-frequency resource information in the preamble sequence information to the SIB; and sending, by the access network device, the SIB over the PDSCH. ### Claim 7 A preamble sequence configuration method, comprising: obtaining, by user equipment, preamble sequence information sent by an access network device, wherein the preamble sequence information comprises a message indicating a quantity of preamble sequences, the preamble sequences are across a time domain, a frequency domain, and a code domain in a preamble sequence space, and the preamble sequence space further comprises a plurality of layers of code domain space in the code domain, and wherein the preamble sequence information comprises space level information that indicates a quantity of code domain space layers of the preamble sequence space; obtaining, by the user equipment, the space level information in the preamble sequence information; and performing, by the user equipment, random access based on the preamble sequence information. ### Claim 8 (depends on 7) The preamble sequence configuration method according to claim 7, wherein the quantity of preamble sequences is a product of the quantity of code domain space layers of preamble sequence space and a quantity of preamble sequences in a layer of time-frequency resource. ### Claim 9 (depends on 7) The preamble sequence configuration method according to claim 7, wherein obtaining, by user equipment, preamble sequence information sent by an access network device and obtaining, by the user equipment, the space level information in the preamble sequence information comprise: performing, by the user equipment, blind detection on a physical broadcast channel (PBCH) to obtain a master system information block (MIB); and determining the space level information based on a cyclic redundancy check (CRC) code removed during the blind detection. ### Claim 10 (depends on 7) The preamble sequence configuration method according to claim 7, wherein obtaining, by user equipment, preamble sequence information sent by an access network device and obtaining, by the user equipment, the space level information in the preamble sequence information comprise: performing, by the user equipment, blind detection on a PBCH to obtain a MIB; and determining the space level information based on a decoding sequence used during the blind detection. ### Claim 11 (depends on 7) The preamble sequence configuration method according to claim 7, wherein obtaining, by user equipment, preamble sequence information sent by an access network device and obtaining, by the user equipment, the space level information in the preamble sequence information comprise: receiving, by the user equipment over a physical downlink shared channel (PDSCH), a system information block (SIB) sent by the access network device, wherein the SIB carries the space level information in the preamble sequence information; and parsing, by the user equipment, the SIB to obtain the space level information. ### Claim 12 (depends on 11) The preamble sequence configuration method according to claim 11, wherein the preamble sequence information further comprises time-frequency resource information, and the time-frequency resource information indicates a time-frequency resource across the time domain, and the frequency domain occupied by the preamble sequence space on a physical random access channel (PRACH); and the obtaining, by user equipment, preamble sequence information sent by an access network device further comprises: receiving, by the user equipment over the PDSCH, the SIB sent by the access network device, wherein the SIB carries the time-frequency resource information in the preamble sequence information; and parsing, by the user equipment, the SIB to obtain the time-frequency resource information. ### Claim 13 User equipment, comprising: a receiver; at least one processor coupled to the receiver; and a non-transitory computer-readable storage medium coupled to the at least one processor and storing programming instructions for execution by the at least one processor; wherein the receiver is configured to obtain preamble sequence information sent by an access network device, wherein the preamble sequence information comprises a message indicating a quantity of preamble sequences, the preamble sequences are across a time domain, a frequency domain, and a code domain in a preamble sequence space, and the preamble sequence space further comprises a plurality of layers of code domain space in the code domain, and wherein the preamble sequence information comprises space level information that indicates a quantity of code domain space layers of the preamble sequence space; wherein the receiver is configured to further obtain the space level information in the preamble sequence information; and wherein the programming instructions instruct the at least one processor to perform random access based on the preamble sequence information. ### Claim 14 (depends on 13) The user equipment according to claim 13, wherein the receiver is specifically configured to: perform blind detection on a physical broadcast channel (PBCH) to obtain a master system information block (MIB); and determine the space level information based on a cyclic redundancy check (CRC) code removed during the blind detection. ### Claim 15 (depends on 13) The user equipment according to claim 13, wherein the receiver is specifically configured to: perform blind detection on a PBCH to obtain a MIB; and determine the space level information based on a decoding sequence used during the blind detection. ### Claim 16 (depends on 13) The user equipment according to claim 13, the receiver is configured to receive, over a physical downlink shared channel (PDSCH), a system information block (SIB) sent by the access network device, wherein the SIB carries the space level information in the preamble sequence information; and the receiver is further configured to parse the SIB to obtain the space level information. ### Claim 17 (depends on 16) The user equipment according to claim 16, wherein the preamble sequence information further comprises time-frequency resource information, and the time-frequency resource information indicates a time-frequency resource across the time domain, and the frequency domain occupied by the preamble sequence space on a physical random access channel (PRACH); the receiver is further configured to receive, over the PDSCH, the SIB sent by the access network device, wherein the SIB carries the time-frequency resource information in the preamble sequence information; and the receiver is further configured to parse the SIB to obtain the time-frequency resource information. ### Claim 18 (depends on 13) The user equipment according to claim 13, wherein the quantity of preamble sequences is a product of the quantity of code domain space layers of preamble sequence space and a quantity of preamble sequences in a layer of time-frequency resource.