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Handling of session context

A context and session management technology, applied in connection management, wireless communication, electrical components, etc., can solve the problems of complex signaling session certification, increase signaling overhead and processing complexity, and endanger backward compatibility, so as to maintain service Continuity, maximum processing complexity, effect of reducing signaling overhead

Pending Publication Date: 2022-02-01
TELEFON AB LM ERICSSON (PUBL)
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  • Claims
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Problems solved by technology

For example, introducing a new procedure between user plane entities and session managers specifically for modifying signaling sessions to account for session manager transfers would increase signaling overhead and processing complexity while jeopardizing backward compatibility
Furthermore, re-establishing the same signaling session in a way that preserves service continuity proves to be complex
[0003] Similar challenges arise for wireless devices transitioning between idle mode and connected mode, which drives the deletion and establishment of signaling sessions between user plane entities and the session manager

Method used

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Examples

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Embodiment

[0179] A group example

[0180] A1. A method performed by a network device configured to implement a user plane function UPF, which UPF handles a user plane path of a protocol data unit PDU session between a wireless device and a data network DN, the method comprising:

[0181] receiving, from a first session management function SMF configured to manage a PDU session, a request to release a signaling session established between the UPF and the first SMF for the PDU session; and

[0182] Control signaling is received from the first SMF indicating that the signaling session is to be re-established with the UPF.

[0183] A2. The method of embodiment A1, wherein the control signaling indicates that the second SMF will re-establish a signaling session with the UPF.

[0184] A3. The method according to embodiment A1, wherein the control signaling indicates that the first SMF will re-establish a signaling session with the UPF.

[0185] A4. The method according to any one of embod...

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Abstract

A network provides PDU sessions between wireless devices and data networks. UPFs in the network handle the user planes of these PDU sessions, while SMFs in the network manage the PDU sessions. The SMFs have dedicated interfaces for signaling sessions to the UPFs. In the occasion that managing of a PDU session has to be transferred from one SMF to another SMF, the first SMF has to release the signalling session with the UPF for the PDU session, and a second SMF has to re-establish the signaling session with the UPF for the same PDU session. To avoid that during the transfer of the management responsibility transfer the wireless device experiences a hick-up in the PDU session the first SMS includes a control element in the release message to the UPF, indicating to the UPF that the signaling session for the PDU session will be re-established by a second SMF, and that the UPF shall continue the handling of the PDU session till re-establishment.

Description

Background technique [0001] A wireless communication network interconnects wireless devices to a data network (DN), such as the Internet. Interconnected in this manner, wireless devices can establish protocol data unit (PDU) sessions with the DN. A session manager in the wireless communication network (for example, a session management function SMF in a 5G network) manages the PDU session. However, at some point during the life cycle of a PDU session, the wireless communication network may need to transfer the responsibility for managing the PDU session from one session manager to another. This complicates the session manager's interaction with the user plane entity handling the user plane path of the PDU session (eg, the user plane function UPF in 5G networks). [0002] In this regard, the initial session manager will previously establish a signaling session (eg, N4 session in 5G network) with the user plane entity for communication related to the device's PDU session. Whe...

Claims

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Application Information

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IPC IPC(8): H04W76/11H04W76/12H04W76/19H04W76/30
CPCH04W76/19H04W76/11H04W76/30H04W76/12H04W76/22H04W36/0033
Inventor M·哈伦斯塔尔A·米哈利M·奥尔松
Owner TELEFON AB LM ERICSSON (PUBL)
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