# US 2021/0243722 A1 · Mobile Switching Node and Mobility Management Node to Page Terminal Device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0243722 A1 - Document ID: US20210243722A1 - Status: Published application - Kind: A1 - Application number: 17/049,730 - Filed: 2019-04-29 - Published: 2021-08-05 - Earliest claimed: 2018-05-11 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Lei Xia; Zhiwei Qu - Web page: https://patentgrep.com/patent/US20210243722A1 ## CPC - H04W 68/02: Arrangements for increasing efficiency of notification or paging channel - H04W 92/24: between backbone network devices - H04W 8/08: Mobility data transfer - H04W 36/00224: {between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]} - H04W 76/16: Involving different core network technologies, e.g. a packet-switched [PS] bearer in combination with a circuit-switched [CS] bearer - H04W 68/00: User notification, e.g. alerting and paging, for incoming communication, change of service or the like - H04W 88/14: Backbone network devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present disclosure relates to a mobile switching node and a mobility management node to page a terminal device. The present disclosure may provide a method for a mobile switching node to page a terminal device. The method includes: storing (S201) an indication of whether a terminal device supports a circuit switching call function; receiving (S202) a request to implement the circuit switching call function, in regard to a subscriber number corresponding to the terminal device; and sending (S203), to a mobility management node, a circuit switching paging request for the terminal device, in response to that the indication shows the terminal device supports the circuit switching call function. ## Claims ### Claim at position 1 1-43. (canceled) ### Claim 44 A method for a mobile switching node to page a terminal device, the method comprising: storing an indication of whether a terminal device supports a circuit switching call function; receiving a request to implement the circuit switching call function in regard to a subscriber number corresponding to the terminal device; and sending, to a mobility management node, a circuit switching paging request for the terminal device, in response to the indication indicating that the terminal device supports the circuit switching call function. ### Claim 45 (depends on 44) The method of claim 44: wherein the subscriber number corresponds to a plurality of terminal devices; and wherein the terminal device to receive the circuit switching paging is selected from the plurality of terminal devices, based on the indication. ### Claim 46 (depends on 44) The method of claim 44, wherein the indication is received from the mobility management node. ### Claim 47 (depends on 46) The method of claim 46, wherein the indication is received from the mobility management node using a location update request. ### Claim 48 (depends on 44) The method of claim 44, wherein the indication shows that the terminal device supports only short message service, or both short message service and circuit switched fallback voice call service. ### Claim 49 A method for a mobility management node to page a terminal device, the comprising: determining whether a terminal device supports a circuit switching call function; and sending, to a mobile switching node, an indication of whether the terminal device supports a circuit switching call function. ### Claim 50 (depends on 49) The method of claim 49, further comprising: receiving, from a mobility management node, a circuit switching paging request for the terminal device; and paging the terminal device. ### Claim 51 (depends on 49) The method of claim 49, wherein the determining whether the terminal device supports the circuit switching call function is based on an information element in a combined attach request or in a tracking area update request from the terminal device. ### Claim 52 (depends on 49) The method of claim 49, wherein the indication is sent to the mobile switching node using a location update request. ### Claim 53 A mobile switching node device to page a terminal device, the mobile switching node comprising: processing circuitry; memory containing instructions executable by the processing circuitry whereby the mobile switching node device is operative to: store an indication of whether a terminal device supports a circuit switching call function; receive a request to implement the circuit switching call function in regard to a subscriber number corresponding to the terminal device; and send, to a mobility management node, a circuit switching paging request for the terminal device, in response to the indication indicating that the terminal device supports the circuit switching call function. ### Claim 54 (depends on 53) The mobile switching node device of claim 53: wherein the subscriber number corresponds to a plurality of terminal devices; and wherein the terminal device to receive the circuit switching paging is selected from the plurality of terminal devices based on the indication. ### Claim 55 (depends on 53) The mobile switching node device of claim 53, wherein the instructions are such that the mobile switching node device is operative to receive the indication from the mobility management node. ### Claim 56 (depends on 53) The mobile switching node device of claim 53, wherein the indication shows that the terminal device supports only short message service, or both short message service and circuit switched fallback voice call service. ### Claim 57 A mobility management node device to page a terminal device, the mobility management node comprising: processing circuitry; memory containing instructions executable by the processing circuitry whereby the mobility management node device is operative to: determine whether a terminal device supports a circuit switching call function; and send, to a mobile switching node, an indication of whether the terminal device supports a circuit switching call function. ### Claim 58 (depends on 57) The mobility management node device of claim 57, wherein the instructions are such that the mobility management node device is operative to: receive, from a mobility management node, a circuit switching paging request for the terminal device; and page the terminal device. ### Claim 59 (depends on 57) The mobility management node device of claim 57, wherein the instructions are such that the mobility management node device is operative to determine whether the terminal device supports the circuit switching call function based on an information element in a combined attach request or in a tracking area update request from the terminal device. ### Claim 60 (depends on 57) The mobility management node device of claim 57, wherein the instructions are such that the mobility management node device is operative to receive the indication in a location update request. ### Claim 61 (depends on 57) The mobility management node device of claim 57, wherein the indication shows that the terminal device supports only short message service, or both short message service and circuit switched fallback voice call service.