# US 10,321,305 B2 · Node and method for managing a packet data network connection and/or an internet protocol-connectivity access network session > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,321,305 B2 - Document ID: US10321305B2 - Status: Granted - Kind: B2 - Application number: 14/896,064 - Filed: 2015-11-13 - Published: 2017-09-14 - Granted: 2019-06-11 - Earliest claimed: 2015-11-13 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget Lm Ericsson (Publ) - Inventors: Yong Yang; Roland Gustafsson; Gunnar Rydnell - Web page: https://patentgrep.com/patent/US10321305B2 ## CPC - H04W 8/24: Transfer of terminal data - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 76/20: Manipulation of established connections - H04W 76/22: Manipulation of transport tunnels - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A method performed in a first network node includes the first network node transmitting, to a second network node, a first message including a user equipment (UE) status request of a UE. The method further includes the first network node receiving, from the second network node, a second message including a UE status response. The method also includes the first network node determining, based on the received UE status, whether to modify an PDN connection and/or a corresponding IP-CAN session associated with the UE. ## Claims ### Claim 1 A method, performed in a first network node, for managing at least one of a Packet Data Network (PDN) connection and a corresponding Internet Protocol-Connectivity Access Network (IP-CAN) session associated with a user equipment, the first network node being configured for use in a wireless communications network, the method comprising: determining a need to perform a modification procedure for modifying at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment; as a result of determining the need to perform the modification procedure, transmitting, to a second network node, a request for a status of the user equipment, wherein the request comprises an event trigger that causes the second network node to transmit a message in response to determining that one or more predetermined conditions are met; receiving, from the second network node, a first response comprising a user equipment status indication, wherein the first response indicates that the user equipment is unreachable or in a power saving mode; as a result of receiving the first response to the request, determining to postpone the performance of the modification procedure; receiving, from the second network node, a second response to the request after receiving the first response, wherein the second response comprises the user equipment status indication and an indication that at least one of the one or more predetermined conditions are met; determining, based on the received second response, whether to perform the modification procedure for modifying at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment. ### Claim 2 (depends on 1) The method of claim 1, further comprising: as a result of receiving the second response, determining whether (i) the user equipment status indication indicates that the user equipment is eligible for a modification to at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment, and (ii) said modification is required; and as a result of determining that (i) the user equipment status indication indicates that the user equipment is eligible for modification, and (ii) said modification is required, the first network node transmitting an instruction to perform the modification procedure for modifying the at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment. ### Claim 3 (depends on 1) The method of claim 1, further comprising: as a result of receiving the second response, determining whether the user equipment status indication indicates that the user equipment is registered in a serving network having at least one policy that conflicts with the bearer associated with the user equipment; as a result of determining that the user equipment status indication indicates that the user equipment is registered in the serving network having at least one policy that conflicts with the bearer associated with the user equipment, the first network node transmitting an instruction to modify the bearer associated with the user equipment to comply with the at least one policy. ### Claim 4 (depends on 1) The method of claim 1, wherein the user equipment status indication comprises an indication of at least one of: (i) whether the user equipment is reachable, (ii) whether the user equipment is in an idle more or an active mode, (iii) a location of the user equipment, (iv) a time zone in which the user equipment is located, and (v) a serving network in which the user equipment is registered. ### Claim 5 (depends on 4) The method of claim 4, wherein the one or more predetermined conditions comprise determining that at least one or more of: (i) the user equipment is reachable, (ii) the user equipment switches from an idle mode to an active mode, (iii) the user equipment moves to a predetermined location, (iv) the user equipment moves to a predetermined time zone, or the (v) the user equipment registers with a serving network having at least one policy that conflicts with the bearer associated with the user equipment. ### Claim 6 (depends on 4) The method of claim 4, further comprising: as a result of receiving the second response, determining whether a modification to a bearer is required based on the user equipment status indication; as a result of determining that the modification to a bearer is required, the first network node transmitting an instruction to perform the modification procedure for modifying the at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment. ### Claim 7 (depends on 1) The method according to claim 1, wherein the first network node is a policy and charging rules function (PCRF) node and the second network node is one of: a mobility management entity (MME), a Serving General Packet Radio Service Support Node (SGSN), an evolved Packet Data Gateway (ePDG), Trusted Wireless local area network Access (TWAN), and High rate packet data Serving Gateway (HSGW). ### Claim 8 (depends on 1) The method of claim 1, wherein the request for the status of the user equipment is transmitted using an S type interface. ### Claim 9 (depends on 1) The method of claim 1, wherein the first and second responses are received over an N type interface. ### Claim 10 (depends on 1) The method of claim 1, wherein the request for the status of the user equipment is transmitted using G type interface via packet data network gateway (PGW) node and to a serving gateway (SGW) node that forwards the request to the MME node, and the SGW and PGW node receives and forwards the first and second responses to the PCRF node. ### Claim 11 (depends on 1) The method of claim 1, wherein the user equipment status event trigger is transferred from a source mobility management node to a target management node upon the user equipment moving from the source mobility management node to the target management node. ### Claim 12 A first network node for managing at least one of a Packet Data Network (PDN) connection and an Internet Protocol-Connectivity Access Network (IP-CAN) session associated with a user equipment, the first network node being configured for use in a wireless communications network, the first network node comprising: a processor; and a computer readable medium coupled to the processor, said computer readable medium containing instructions executable by the processor, whereby the first network node is operative to: determine a need to perform a modification procedure for modifying at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment; as a result of determining the need to perform the modification procedure, transmit, to a second network node, a request for a status of the user equipment, wherein the request comprises an event trigger that causes the second network node to transmit a message in response to determining that one or more predetermined conditions are met; receive, from the second network node, a first response comprising a user equipment status indication, wherein the first response indicates that the user equipment is unreachable or in a power saving mode; as a result of receiving the first response to the request, determine to postpone the performance of the modification procedure; receive, from the second network node, a second response to the request after receiving the first response, wherein the second response comprises the user equipment status indication and an indication that at least one of the one or more predetermined conditions are met; determine, based on the received second response, whether to perform the modification procedure for modifying at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment. ### Claim 13 (depends on 12) The first network node of claim 12, wherein the first network node is further operative to: as a result of receiving the second response, determine whether (i) the user equipment status indication indicates that the user equipment is eligible for a modification to at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment, and (ii) said modification is required; and as a result of determining that (i) the user equipment status indication indicates that the user equipment is eligible for modification, and (ii) said modification is required, transmit an instruction to perform the modification procedure for modifying the at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment. ### Claim 14 (depends on 12) The first network node of claim 12, wherein the first network node is further operative to: as a result of receiving the second response, determine whether the user equipment status indication indicates that the user equipment is registered in a serving network having at least one policy that conflicts with the bearer associated with the user equipment; as a result of determining that the user equipment status indication indicates that the user equipment is registered in the serving network having at least one policy that conflicts with the bearer associated with the user equipment, transmit an instruction to modify the bearer associated with the user equipment to comply with the at least one policy. ### Claim 15 (depends on 12) The first network node of claim 12, wherein the user equipment status indication comprises an indication of at least one of: (i) whether the user equipment is reachable, (ii) whether the user equipment is in an idle more or an active mode, (iii) a location of the user equipment, (iv) a time zone in which the user equipment is located, and (v) a serving network in which the user equipment is registered. ### Claim 16 (depends on 10) The first network node of claim 10, wherein the one or more predetermined conditions comprise determining that at least one or more of: (i) the user equipment is reachable, (ii) the user equipment switches from an idle mode to an active mode, (iii) the user equipment moves to a predetermined location, (iv) the user equipment moves to a predetermined time zone, or the (v) the user equipment registers with a serving network having at least one policy that conflicts with the bearer associated with the user equipment. ### Claim 17 (depends on 10) The first network node of claim 10, wherein the first network node is further operative to: as a result of receiving the second response, determine whether a modification to a bearer is required based on the user equipment status indication; as a result of determining that the modification to a bearer is required, transmit an instruction to perform the modification procedure for modifying the at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment. ### Claim 18 (depends on 12) The first network node according to claim 12, wherein the first network node is a policy and charging rules function (PCRF) node and the second network node is a mobility management entity (MME), a Serving General Packet Radio Service Support Node (SGSN), an evolved Packet Data Gateway (ePDG), Trusted Wireless local area network Access (TWAN), or High rate packet data Serving Gateway (HSGW). ### Claim 19 (depends on 12) The first network node of claim 12, wherein the request for the status of the user equipment is transmitted using an S type interface. ### Claim 20 (depends on 12) The first network node of claim 12, wherein the first and second responses are received over an N type interface. ### Claim 21 (depends on 12) The first network node of claim 12, wherein the request for the status of the user equipment is transmitted using G type interface via packet data network gateway (PGW) node and to a serving gateway (SGW) node that forwards the request to the MME node, and the SGW and PGW node receives and forwards the first and second responses to the PCRF node. ### Claim 22 (depends on 12) The first network node of claim 12, wherein the user equipment status event trigger is transferred from a source mobility management node to a target management node upon the user equipment moving from the source mobility management node to the target management node. ### Claim 23 A computer product for managing a first network node, for managing at least one of a Packet Data Network (PDN) connection and an Internet Protocol-Connectivity Access Network (IP-CAN) session associated with a user equipment, the first network node being configured for use in a wireless communications network, the computer product comprising a non-transitory computer readable medium storing computer instructions for: determining a need to perform a modification procedure for modifying at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment; as a result of determining the need to perform the modification procedure, transmitting, to a second network node, a request for a status of the user equipment, wherein the request comprises an event trigger that causes the second network node to transmit a message in response to determining that one or more predetermined conditions are met; receiving, from the second network node, a first response comprising a user equipment status indication, wherein the first response indicates that the user equipment is unreachable or in a power saving mode; as a result of receiving the first response to the request, determining to postpone the performance of the modification procedure; receiving, from the second network node, a second response to the request after receiving the first response, wherein the second response comprises the user equipment status indication and an indication that at least one of the one or more predetermined conditions are met; determining, based on the received second response, whether to perform the modification procedure for modifying at least one of the PDN connection and the corresponding IP-CAN session associated with the user equipment. ### Claim 24 A method, performed in a second network node, for managing at least one of a Packet Data Network (PDN) connection and an Internet Protocol-Connectivity Access Network (IP-CAN) session associated with a user equipment, the second network node being configured for use in a wireless communications network, the method comprising: the second network node receiving, from a first network node, a request for a status of the user equipment, wherein the request comprises an event trigger that causes the second network node to transmit a message in response to determining that one or more predetermined conditions are met; the second network node determining a first status of the user equipment; as a result of determining the first status of the user equipment, the second network node transmitting a first response comprising a user equipment status indication, wherein the first response indicates that the user equipment is unreachable or in a power saving mode; the second network node determining, after transmitting the first response to the request, that at least one of the one or more predetermined conditions are met; and as a result of determining that at least one of the one or more predetermined conditions are met, the second network node transmitting, to the first network node, a second response, wherein the second response comprises the user equipment status indication and an indication that at least one of the one or more predetermined conditions are met, wherein the user equipment status comprises an indication of at least one of (i) whether the user equipment is reachable, (ii) whether the user equipment is in an idle mode or an active mode, (iii) a location of the user equipment, (iv) a time zone in which the user equipment is located, and (v) a serving network in which the user equipment is registered. ### Claim 25 (depends on 24) The method of claim 24, wherein the one or more predetermined conditions comprise determining that (i) the user equipment is reachable, (ii) the user equipment switches from an idle mode to an active mode, (iii) the user equipment moves to a predetermined location, (iv) the user equipment moves to a predetermined time zone, or the (v) the user equipment registers with a serving network having at least one policy that conflicts with the bearer associated with the user equipment. ### Claim 26 (depends on 24) The method of claim 24, wherein the first network node is a policy and charging rules function (PCRF) node and the second network node is one of: a mobility management entity (MME), a Serving General Packet Radio Service Support Node (SGSN), an evolved Packet Data Gateway (ePDG), Trusted Wireless local area network Access (TWAN), and High rate packet data Serving Gateway (HSGW). ### Claim 27 (depends on 24) The method of claim 24, wherein the request for the status of the user equipment is transmitted using an S type interface. ### Claim 28 (depends on 24) The method of claim 24, wherein the first and second responses are received over an N type interface. ### Claim 29 (depends on 24) The method of claim 24, wherein the request for the status of the user equipment is transmitted using G type interface via packet data network gateway (PGW) node and to a serving gateway (SGW) node that forwards the request to the MME node, and the SGW and PGW node receives and forwards the first and second responses to the PCRF node. ### Claim 30 (depends on 24) The method of claim 24, wherein the second network node is a source mobility management node and the user equipment status event trigger is transferred from the source mobility management node to a target management node upon the user equipment moving from the source mobility management node to the target management node. ### Claim 31 A second network node for managing at least one of a Packet Data Network (PDN) connection and an Internet Protocol-Connectivity Access Network (IP-CAN) session associated with a user equipment, the second network node being configured for use in a wireless communications network, the second network node comprising: a processor; and a computer readable medium coupled to the processor, said computer readable medium containing instructions executable by the processor, whereby the first network node is operative to: receive, from a first network node, a request for a status of the user equipment, wherein the request comprises an event trigger that causes the second network node to transmit a message in response to determining that one or more predetermined conditions are met; determine a first status of the user equipment; as a result of determining the first status of the user equipment, transmit a first response comprising a user equipment status indication, wherein the first response indicates that the user equipment is unreachable or in a power saving mode; determine, after transmitting the first response to the request, that at least one of the one or more predetermined conditions are met; and as a result of determining that at least one of the one or more predetermined conditions are met, transmit, to the first network node, a second response, wherein the second response comprises the user equipment status indication and an indication that at least one of the one or more predetermined conditions are met, wherein the user equipment status comprises an indication of at least one of (i) whether the user equipment is reachable, (ii) whether the user equipment is in an idle mode or an active mode, (iii) a location of the user equipment, (iv) a time zone in which the user equipment is located, and (v) a serving network in which the user equipment is registered. ### Claim 32 (depends on 31) The second network node of claim 31, wherein the one or more predetermined conditions comprise determining that (i) the user equipment is reachable, (ii) the user equipment switches from an idle mode to an active mode, (iii) the user equipment moves to a predetermined location, (iv) the user equipment moves to a predetermined time zone, or the (v) the user equipment registers with a serving network having at least one policy that conflicts with the bearer associated with the user equipment. ### Claim 33 (depends on 31) The second network node of claim 31, wherein the first network node is a policy and charging rules function (PCRF) node and the second network node is a mobility management entity (MME), a Serving General Packet Radio Service Support Node (SGSN), an evolved Packet Data Gateway (ePDG), Trusted Wireless local area network Access (TWAN), or High rate packet data Serving Gateway (HSGW). ### Claim 34 (depends on 31) The second network node of claim 31, wherein the request for the status of the user equipment is transmitted using an S type interface. ### Claim 35 (depends on 31) The second network node of claim 31, wherein the first and second responses are received over an N type interface. ### Claim 36 (depends on 31) The second network node of claim 31, wherein the request for the status of the user equipment is transmitted using G type interface via packet data network gateway (PGW) node and to a serving gateway (SGW) node that forwards the request to the MME node, and the SGW and PGW node receives and forwards the first and second responses to the PCRF node. ### Claim 37 (depends on 31) The second network node of claim 31, wherein the second network node is a source mobility management node and the user equipment status event trigger is transferred from the source mobility management node to a target management node upon the user equipment moving from the source mobility management node to the target management node.