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Inter-rat handover control using empty gre packets

A data packet, mobile station technology, applied in the direction of electrical components, wireless communication, etc.

Inactive Publication Date: 2018-05-15
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since there is no such procedure for UE handover between network nodes associated with some RATs (i.e. handover from 3GPP to HRPD (High Rate Packet Data)), there is a risk of out-of-order packet delivery

Method used

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  • Inter-rat handover control using empty gre packets
  • Inter-rat handover control using empty gre packets
  • Inter-rat handover control using empty gre packets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] Embodiments disclosed herein use empty GER (Generic Routing Encapsulation) packets for in-order delivery of packets of a session to a UE (User Equipment) during inter-RAT (Radio Access Technology) handover. Specifically, an empty GRE packet sent from a source gateway in a source RAN (radio access network) to a target gateway in a target RAN indicates the end of a data packet from the source gateway. The target gateway sends data packets received from the source gateway to the UE until an empty GRE packet is received. After receiving the empty GRE packet, the target gateway sends to the UE the data packet received directly from the network gateway. Although embodiments are described herein in terms of 3GPP and HRPD networks, embodiments of the invention disclosed herein are generally applicable to any downlink inter-RAT handover.

[0023] Before describing further details, inter-RAT handovers are first generally described below. figure 1 Shown is a wireless network com...

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PUM

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Abstract

Null GRE packets are used to provide in-order delivery of data packets of the session to the UE during inter-RAT handover. Specifically, an empty GRE packet sent from a source gateway in the source RAN to a target gateway in the target RAN indicates to the target gateway the end of the data packet forwarded from the source gateway. The target gateway sends data packets received from the source gateway to the UE until an empty GRE packet is received. Upon receiving the empty GRE packet, the target gateway starts sending data packets to the UE received directly from the home home network gateway.

Description

technical field [0001] The invention disclosed herein relates generally to handover of mobile stations, and more particularly to ordered delivery of data packets during inter-RAT handover using empty Generic Routing Encapsulation (GRE) packets. Background technique [0002] The 3rd Generation Partnership Project (3GPP) oversees and governs 3rd Generation (3G) networks, including 3G Long Term Evolution (LTE) networks. 3G LTE provides mobile broadband to user equipment (UE) within the 3G LTE network at higher data rates than are generally available to other networks. For example, the air interface of the 3G LTE Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN) utilizes multi-antenna and multi-user coding techniques to achieve a downlink data rate of hundreds of Mbps and a data rate of tens of Mbps. Uplink data rate. [0003] In LTE, user mobility is controlled by the network with assistance from the UE. The handover decisio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/02H04W36/14H04W88/16
CPCH04W36/023H04W36/14H04W88/16H04W36/02
Inventor S.贾伊斯瓦尔文仁华
Owner TELEFON AB LM ERICSSON (PUBL)