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System and method for mobile terminal retransmitting up-link data in soft switching area

A technology for switching areas and links, which is applied in the field of retransmitting packet data by mobile terminals, and can solve problems such as the inability to guarantee the reliability of ACK/NACK information

Inactive Publication Date: 2004-09-29
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] However, since several Node Bs send different ACK / NACK information to the UE for packet data #1, the reliability of the ACK / NACK information cannot be guaranteed for the UE

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  • System and method for mobile terminal retransmitting up-link data in soft switching area

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Embodiment Construction

[0042] Several embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, for the sake of brevity, descriptions of well-known functions or constructions will be omitted.

[0043] The present invention introduces a new hybrid automatic repeat request (HARQ) scheme for an uplink communication system using EUDCH to provide soft handover. Those of ordinary skill in the art should understand that the term "handover" refers to handover. According to the present invention, the uplink communication system adopts the HARQ scheme of the HASDPA communication system.

[0044] That is, the uplink transmission system uses Adaptive Modulation and Coding and HARQ (AMC). In this case, n-channel (SAW HARQ) n-channel stop and wait hybrid automatic repeat request (SAW HARQ) will be described below.

[0045] The n-channel SAW HARQ applies the following two new technologies to improve SAW ARQ efficiency.

[0046] (1) Soft ...

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Abstract

A method and system of retransmitting uplink packet data from a user equipment (UE) in a handover region to Node Bs. The UE transmits packet data to the Node Bs on an enhanced uplink dedicated transport channel (EUDCH). The Node Bs transmit to the UE first response fields indicating whether the Node Bs have received good packet data or bad packet data, and second response fields that the Node Bs received from an RNC indicating whether a radio network controller (RNC) has received good packet data or bad packet data. The UE then detects the first and second response fields and retransmits the uplink packet data according to the values of the response fields in the UE.

Description

technical field [0001] The present invention generally relates to a system and method for retransmitting packet data from a mobile terminal in an asynchronous code division multiple access (CDMA) communication system using an Enhanced Uplink Dedicated Transport Channel (EUDCH), and more particularly to a system and method for retransmitting packet data from a mobile terminal in a soft handover region A system and method for a mobile terminal to retransmit packet data. Background technique [0002] Generally, a user equipment (UE) selects its data rate to be lower than a preset highest available data rate. The highest data rate is provided by the Radio Network Controller (RNC). Therefore, the Node B is not involved in controlling the uplink data rate. However, the Node B determines the availability of uplink transmission and the highest data rate available for the EUDCH and sends the information to the UE according to the scheduling order. Then, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04L1/00H04L1/18H04L12/56H04W28/04H04W36/18H04W88/08H04W88/12
CPCH04L2001/0092H04W88/12H04L1/0026H04L1/06H04L1/0025H04L1/1812H04L1/1845H04W28/04H04W36/18H04L1/1803H04L1/1671H04L1/0002H04W88/08H04W36/0069H04W36/08H04L1/18
Inventor 李焌诚崔镇圭金宪基申桥淑金鲁善
Owner SAMSUNG ELECTRONICS CO LTD