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Communication Systems

A technology of a wireless communication system and a communication method, applied in the directions of wireless communication, connection management, electrical components, etc., can solve the problems of rerouting/redirection failure, inability to forward NAS messages and dedicated MME, etc.

Active Publication Date: 2021-07-06
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if that particular UE usage type is not supported in the current MME pool (even if it was supported in the previous MME pool where the UE was registered before), the base station will not be able to forward the NAS message to the dedicated MME, so it Possibility to continue selecting the same (or another) default MME again for the UE
In this case, the newly selected default MME will also try to reroute NAS messages to the dedicated MME corresponding to the UE's usage type, which will result in unnecessary signaling and / or possible back and forth between the base station and the default MME "ping-pong" handshake (without successfully registering the UE in the network and / or without providing proper feedback to the UE sending the NAS message)
[0021] Therefore, in this case, the rerouting / redirection of specific NAS messages to the private core network may fail, which in turn may result in the network being unable to establish / maintain service for the UE that sent the NAS message

Method used

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Examples

Experimental program
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no. 1 example

[0072] Figure 5 An exemplary sequence diagram indicating a process for rerouting NAS messages is shown. Specifically, in this example, the base station 5 (labeled "eNB") serving the mobile device 3D indicates to the selected MME 9 whether re-routing is allowed or not.

[0073] Although in Figure 5 Not shown in , but base station 5 is initially (using its S1AP module 67) associated with some (or all) of the MME pool at that base station 5 (in this example, the MME pool includes MME 9C and MME 9D) MME 9 establishes respective S1 connections.

[0074] The process starts with the mobile device 3D generating (using its NAS module 45 ) and sending in step S501 an appropriately formatted NAS message to its serving base station 5 (for relaying the NAS message to the appropriate MME 9 ). NAS messages may include attach requests, tracking area updates (TAUs), routing area updates (RAUs), and / or similar messages. The mobile device 3D (using its RRC module 44) embeds the NAS message...

no. 2 example

[0087] Figure 6 An exemplary sequence diagram indicating a process for rerouting NAS messages is shown. Specifically, in this example, the default MME determines whether rerouting is possible.

[0088] Steps S601 to S605b correspond to Figure 5 Steps S501 to S505b, so for the sake of brevity, their descriptions are omitted here.

[0089] However, in this example, the default MME 9C is advantageously configured to obtain information about what type of private network (what UE usage type) is supported in its MME pool, so that the default MME 9C can determine that a UE with a mobile device 3D uses Whether private networks of type are supported. Therefore, based on this information, the default MME 9C is able to re-route NAS messages to the correct private network (if appropriate).

[0090] For example, information about the types of private networks supported in a pool of MMEs (and / or by a particular MME) may be provided by a network operator (e.g., via an Operations, Admin...

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Abstract

The present invention discloses a communication system, wherein a base station receives NAS signaling from a communication device for establishing a connection via the base station. The base station forwards the NAS signaling to the default MME to establish a connection to the default MME. The default MME, in response to the base station's forwarding of the NAS signaling, sends a message identifying the MME group to which the NAS signaling should be rerouted. The base station selects an MME based on the message identifying the MME group, forwards the NAS signaling to the selected MME, and includes information indicating that the NAS signaling should not be rerouted.

Description

technical field [0001] The present invention relates to communication systems. The present invention is applicable to standards according to the 3rd Generation Partnership Project (3GPP) or their equivalents or derivatives such as the Universal Terrestrial Radio Access Network (UTRAN) and the Long Term Evolution of UTRAN (LTE) (E-UTRAN), including LTE- Advanced) operating wireless communication systems and their equipment are of special but not exclusive relevance. The present invention has particular but not exclusive relevance to the use of private core networks. Background technique [0002] Under the 3GPP standard, a NodeB (or eNB in ​​LTE) is a base station through which mobile devices connect to the core network and communicate with other mobile devices or remote servers. To enable this, the mobile device establishes a so-called Radio Resource Control (RRC) connection with the serving base station. For the sake of brevity, this application will use the term base sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W40/24
CPCH04W88/14H04W76/12
Inventor 伊斯克伦·艾尼田村利之吉纳迪·维烈夫安德烈亚斯·孔兹
Owner NEC CORP