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AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsHåkan Tranberg, Lasse Olsson
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The application relates to the procedures Routing Area Update RAU in UTRAN and Tracking Area Update TAU in LTE. Furthermore, it relates to PDP context procedure in UTRAN as well as PDN connection procedure in LTE. In the current RAU procedure, a SGSN, which fails to update the Routing Area, e.g. because it receives the DNS return error, sends a RAU Reject with the cause code CC#17 indicating a network failure back to the user equipment (114b). The cause code CC#17 in the RAU Reject causes the user equipment to send a new RAU Request. Thus, the user equipment is stuck in a loop of sending a RAU Request and receiving a RAU Reject. This problem is solved by the present application in that SGSN keeps track of the number of rejections when doing RAU. When the number of rejections is above a certain threshold, the SGSN will send a RAU Reject with cause code CC#10 to the user equipment (115b), whereby the cause code CC#10 indicates implicit detach of the user equipment. In other words, the cause code is changed from CC#17 to CC#10 and in order to avoid further looping. The same principle is applied to TAU in LTE as well as to PDP procedures in UTRAN and LTE.
A method in a first network node (101b, 401) for handling a user equipment (410) in a communication network (100b, 200b, 300b, 400), wherein the first network node (101b, 401) is connected to the user equipment (410), the method comprising:
The method according to any of the preceding claims, wherein the obtaining (113b, 214b, 313b, 503) information about rejection of the request message further comprises:
The method according to any of the preceding claims, further comprising:
The method according to any of the preceding claims, further comprising:
The method according to any of the preceding claims, further comprising:
The method according to any of the preceding claims, wherein the request message is a Routing Area Update, RAU, message or a Tracking Area Update, TAU, message;
The method according to any of the preceding claims, wherein the request message is an activate Packet Data Protocol, PDP, context request message or an activate Packet Data Network, PDN, connection request message;
The method according to any of the preceding claims, wherein the request message is an activate Packet Data Protocol, PDP, context request message or an activate Packet Data Network, PDN, connection request message;
The method according to any of the preceding claims, wherein the first network node (101b, 401) is a Serving General packet radio service Support Node, SGSN (101b), or a Mobility Management Entity, MME, or a combined SGSN and MME.
A first network node (101b, 401) for handling a user equipment (410) in a communication network (100b, 200b, 300b, 400), wherein the first network node (101b, 401) is configured to be connected to the user equipment (410), the first network node (101b, 410) comprising:
Dependencies are inferred from the claim text.