Method for transferring user terminal in service universal grouping wireless business supporting node pool

Abstract

The invention discloses a method for transferring a user terminal in a pool of support nodes serving general packet radio services. When the source SGSN determines that the user terminal needs to be transferred, it allocates a P-TMSI containing a virtual NRI to the user terminal, and then the source SGSN transfers the user terminal to the user terminal. The returned update response carries the assigned P-TMSI and a specified duration; after receiving the update response, the user terminal starts a timer according to the specified duration carried in the update response, and when the timer expires, the user terminal initiates a new update request; The RAN node determines that the user terminal needs to be transferred according to the virtual NRI provided by the user terminal, and transfers the user terminal to the target SGSN. After the update process is completed, the user terminal is transferred to the new SGSN, so that the user terminal initiates a new routing area update time completely Controlled by the network side, the transfer process of the user terminal in the SGSN node pool is improved.

Description

technical field [0001] The present invention relates to core network technology, in particular to a method for transferring a user terminal in a serving general packet radio service (GPRS) support node (SGSN, Serving GPRS Support Node) pool. Background technique [0002] According to the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) standard, a radio access network (RAN, Radio Access Network) node can be connected to multiple core network (CN, Core Network) nodes to form a many-to-many correspondence . The RAN node may be a radio network controller (RNC, Radio Network Controller) or a base station controller (BSC, Basic Station Controller). The CN node in the circuit domain is a mobile switching center (MSC, Mobile Switching Centre), and the CN node in the packet domain is an SGSN. [0003] The concept of a pool area is proposed in the 3GPP standard. A pool area refers to an area covered by multiple RAN nodes. When a user terminal roams in t...

AI Technical Summary

Problems solved by technology

[0025] It can be seen from the above description that in step 110, after receiving the RAU response, the user terminal will compare the non-broadcast RAI carried in the RAU response with the RAI stored in itself. Under the control of the network side, if the Iu connection is not released, the RRC connection still exists. In step 112, the user terminal will transmit the RAU request to the RAN node through the uplink direct transfer message (UPLINKDIRECT TRANSFER), but the uplink direct transfer message does not carry The parameter NRI makes it impossible for the RAN node to determine whether to transfer the user terminal. At this time, since the Iu connection still exists, the RAN node sends the RAU request to the source SGSN through the Iu connection. In this way, the new RAU request initiated by the user terminal is sent to the source SGSN again. SGSN, if the above problems are repeated, the routing area update initiated by the user terminal will enter an infinite loop; even if the above problems are not repeated, the transmission resources on the network side are wasted, and the RAN node and the source SGSN have performed useless processing

Images