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Handover in a wireless data packet communication system that avoid user data loss

A packet communication and wireless data technology, applied in wireless communication, digital transmission system, transmission system, etc., can solve problems such as routing, function duplication, and consumption of OTA resources

Inactive Publication Date: 2010-07-14
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, in order to retransmit a small amount of data that was lost on UL or DL ​​during RLC reset and fragmented by the RLC layer, the complete (larger) PDCP PDU has to be retransmitted, which consumes OTA resources
In addition, the PDCP layer performs PDCP PDU reordering during handover and the RLC layer performs in-order delivery at other times, resulting in duplication of functions between the two protocols
Additionally, upper layer functions such as TCP / IP transmission windows crash when packet loss is detected
It also needs to be realized that during handover, because the UE user data received by the target eNB on the UL cannot be routed to the AGW until a new S1 interface is established between the access gateway (AGW) and the target eNB, it causes Interruption of UL user data

Method used

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  • Handover in a wireless data packet communication system that avoid user data loss
  • Handover in a wireless data packet communication system that avoid user data loss
  • Handover in a wireless data packet communication system that avoid user data loss

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Embodiment Construction

[0028] The hard handover (HO) system of the wireless communication system supports the handover when the user equipment (UE) moves from the area covered by one evolved base node (eNB) to another eNB according to the 3GPP LTE (3rd Generation Partnership Project Long Term Evolution) protocol . In particular, the Radio Link Control (RLC) layer is not reset during handover, ensuring that the RLC recovers all lost RLC PDUs without relying on higher Packet Data Convergence Protocol (PDCP) layers to retransmit larger PDCP packets unit (PDU). Additionally, RLC status and RLC PDUs of downlink (DL) packets are forwarded from the source eNB to the target eNB. In addition, the RLC state of the uplink (UL) is forwarded from the source eNB to the target eNB, thus routing UL PDCP PDUs to the AGW even before a new S1 interface is established between the access gateway (AGW) and the target eNB. Thus, lossless user data can be maintained without excessive delays that would otherwise adversely...

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Abstract

An apparatus, method, processor(s), and computer program product avoids user data loss by network-controlled, user equipment assisted handover in a wireless data packet communication system. A wireless receiver receives radio link control (RLC) packet data units (PDUs) from user equipment (UE) being served by a source node. A wireless transmitter commands the UE to handover. A network communication interface transmits RLC Uplink (UL) context from the source node to the target node, and transmits RLC Downlink (DL) initialization message and buffered in-transit DL RLC PDUs from the source node to the target node.

Description

[0001] Claim Priority Pursuant to 35 U.S.C. §119 [0002] This patent application claims the benefit of a U.S. provisional patent entitled "Methods and Apparatuses for Handover Procedure With Relocation Of The RLC Entity From Source eNode B To Target eNode B Without Reset Or Re-Establishment Of The RLC Entities" filed on August 8, 2007 Priority to Application No. 60 / 954,797, a provisional application assigned to the assignee of the present application, is expressly incorporated herein by reference. Background technique [0003] Wireless communication systems have been widely deployed to provide various types of communication content such as voice, data, and so on. These systems can be multiple-access systems that can support communication with multiple users by sharing available system resources (eg, bandwidth and transmit power). Examples of such multiple-access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Freque...

Claims

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Application Information

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IPC IPC(8): H04W36/08
CPCH04L1/1874H04W36/0033H04W36/02H04L1/1896H04L2001/0092
Inventor S·Y·D·何A·梅朗P·A·巴拉尼F·格里利N·E·坦尼R·A·A·阿塔尔
Owner QUALCOMM INC
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