# US 12,184,606 B2 · Method and device for edge application server discovery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,184,606 B2 - Document ID: US12184606B2 - Status: Granted - Kind: B2 - Application number: 18/362,360 - Filed: 2023-07-31 - Published: 2024-01-18 - Granted: 2024-12-31 - Earliest claimed: 2021-02-18 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Jicheol Lee; Hyesung Kim; Sangsoo Jeong - Web page: https://patentgrep.com/patent/US12184606B2 ## CPC - H04L 61/4541: Directories for service discovery - H04L 61/4511: using domain name system [DNS] - H04L 67/1021: based on client or server locations - H04W 8/18: Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The disclosure relates to a 5th generation (5G) communication system communication scheme and a system thereof to support a higher data rate than that of the 4th generation (4G) system. A method performed by an edge application server discover function (EASDF) to discover an edge application server (EAS) is provided. The method includes, receiving a context message including a DNS message processing rule from an session management function (SMF), receiving a DNS query message from a user equipment (UE), transmitting the processed DNS query message to a DNS server based on the DNS message processing rule, receiving a DNS response message including an EAS internet protocol (IP) address from the DNS server, and transmitting the DNS response message to the UE based on the DNS message processing rule. ## Claims ### Claim 1 A method performed by a session management function (SMF), the method comprising: obtaining edge application server (EAS) configuration information provided from an application function (AF); generating a domain name system (DNS) message processing rule based on the EAS configuration information; and transmitting, to an edge application server discover function (EASDF) entity, a context message comprising the generated DNS message processing rule, wherein the EAS configuration information comprises at least one of: one or more fully qualified domain name (FQDN), one or more data network access identifiers (DNAIs) for the EAS configuration information, or one or more DNS server information for each DNAI, wherein the DNS message processing rule comprises: an identifier of the DNS message processing rule, an EAS IP address range related to a DNS response message, and a reporting-once indication of a DNS message corresponding to the EAS IP address range. ### Claim 2 (depends on 1) The method of claim 1, wherein the EAS configuration information comprises multiple DNS server address for one FQDN. ### Claim 3 (depends on 1) The method of claim 1, wherein the EAS configuration information further comprises at least one of: one or more enhanced DNS client subnet (ECS) options, or one or more edge computer area names (ECANs) for one FQDN. ### Claim 4 (depends on 1) The method of claim 1, wherein the AF comprises at least one of a policy control function (PCF), a network exposure function (NEF), or a user data repository (UDR). ### Claim 5 (depends on 1) The method of claim 1, further comprising: receiving, from the EASDF entity, a report message related to at least one of a DNS query message or a DNS response message, wherein the DNS query message is received to the EASDF entity from a user equipment (UE), and reported to the SMF via the report message based on the DNS message processing rule, and wherein the DNS response message is received to the EASDF entity from a DNS server, and reported to the SMF via the report message based on the DNS message processing rule. ### Claim 6 (depends on 5) The method of claim 5, wherein the DNS query message further comprises at least one of fully qualified domain name (FQDN) related to the EAS or an IP address of the UE. ### Claim 7 (depends on 5) The method of claim 5, wherein the DNS server comprises at least one of a central DNS (C-DNS) server or a local DNS (L-DNS) server. ### Claim 8 (depends on 1) The method of claim 1, wherein the context message further comprises at least one of UE identifier of a UE, UE internet protocol (IP) address, Ethernet medium access control (MAC) address of the UE, or subscription permanent identifier (SUPI). ### Claim 9 A session management function (SMF) comprising: a transceiver; and a processor configured to control the transceiver to: obtain edge application server (EAS) configuration information provided from an application function (AF), generate a domain name system (DNS) message processing rule based on the EAS configuration information, and transmit, to an edge application server discover function (EASDF) entity, a context message comprising the generated DNS message processing rule, wherein the EAS configuration information comprises at least one of: one or more fully qualified domain name (FQDN), one or more data network access identifiers (DNAIs) for the EAS configuration information, or one or more DNS server information for each DNAI, and wherein the DNS message processing rule comprises: an identifier of the DNS message processing rule, an EAS IP address range related to a DNS response message, and a reporting-once indication of a DNS message corresponding to the EAS IP address range. ### Claim 10 (depends on 9) The SMF of claim 9, wherein the EAS configuration information comprises multiple DNS server address for one FQDN. ### Claim 11 (depends on 9) The SMF of claim 9, wherein the EAS configuration information further comprises at least one of: one or more enhanced DNS client subnet (ECS) options, or one or more edge computer area names (ECANs) for one FQDN. ### Claim 12 (depends on 9) The SMF of claim 9, wherein the AF comprises at least one of a policy control function (PCF), a network exposure function (NEF), or a user data repository (UDR). ### Claim 13 (depends on 9) The SMF of claim 9, wherein the processor is configured to: receive, from the EASDF entity, a report message related to at least one of a DNS query message or a DNS response message, wherein the DNS query message is received to the EASDF entity from a user equipment (UE), and reported to the SMF via the report message based on the DNS message processing rule, and wherein the DNS response message is received to the EASDF entity from a DNS server, and reported to the SMF via the report message based on the DNS message processing rule. ### Claim 14 (depends on 13) The SMF of claim 13, wherein the DNS query message further comprises at least one of fully qualified domain name (FQDN) related to the EAS or an IP address of the UE. ### Claim 15 (depends on 13) The SMF of claim 13, wherein the DNS server comprises at least one of a central DNS (C-DNS) server or a local DNS (L-DNS) server. ### Claim 16 (depends on 9) The SMF of claim 9, wherein the context message further comprises at least one of UE identifier of a UE, UE internet protocol (IP) address, Ethernet medium access control (MAC) address of the UE, or subscription permanent identifier (SUPI).