Packet transferring/transmitting method and mobile communication system

Abstract

A packet transferring / transmitting method is provided for use in a mobile communication system 50. In this packet transferring / transmitting method, an upper node 1 determines the implementation of handover (determination step), and a handover addressing node 2 transfers, of a plurality of packets, a non-transmitted residual packet to a handover addressed node 3, and the upper node 1 transmits a new packet to the handover addressed node 3 (transfer / transmission step). This enables maintaining the number of users to be accommodated while securing a wide bandwidth, sharing a line with high efficiency at soft handover, avoiding data residual in the case of the employment of variable communication rate, and preventing an increase in retransmission.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present application is a continuation of U.S. patent application Ser. No. 11 / 057,990, filed Feb. 15, 2005, the entirety of which is incorporated herein by reference.TECHNICAL FIELD [0002] The present invention relates to soft handover at high-speed large-capacity communications in a W-CDMA (Wideband-Code Division Multiple Access: Wideband CDMA) system, and more particularly to a packet transferring / transmitting method and mobile communication system suitable for DSCH (Downlink Shared Channel) and HS-DSCH (High Speed Downlink Shared Channel). BACKGROUND ART [0003] In recent years, the development of a CDMA mobile communication system has been in a prompt advance. Moreover, a commercial service based on the W-CDMA system has started, which enables the transmission / reception of large-capacity data such as moving images along with voices and still images included in the current main services. In this situation, as a group for the standa...

AI Technical Summary

Benefits of technology

The present invention provides a method for transferring packets in a mobile communication system during handover, which improves communication quality and efficiency of radio resources. The method involves determining when to initiate handover and transferring residual packets to the handover addressed node. The handover addressed node can transmit a new packet and secure a new channel for transmission. The method can use a separate transfer channel or an added channel for transmission, and can also include a frame for transmitting a radio frame with the handover addressed node. The mobile communication system can switch transmission paths between the upper apparatus and the mobile unit, and can also reduce the number of times of retransmission. Overall, the method and system improve service quality and efficiency of the mobile communication system.

Problems solved by technology

This increased bandwidth enhances the interference in a radio zone, thereby causing the degradation of the communication quality and decreasing the number of users to be accommodated.

For solving the increase of the bandwidth and the decrease of the number of users through the use of a conventional technique, there is a need to improve the throughput required in each node and each transmission line and to increase the number of facilities, which leads to a considerable demerit in view of cost performance.

On the other hand, difficulty is experienced in simultaneously transmitting the same data to a plurality of channels at all times like the soft handover.

However, an increase of this retransmission causes the degradation of the communication rate.

(S4) Likewise, the increase of the retransmission leads to an increase in unnecessary traffic, which presses the throughput (for example, the capability of protocol processing, signal transmission / reception, charge processing and others) of each node and each transmission line.

That is, the cost performance of the facility deteriorates.

(S5) the real-time performance on communications degrades, which leads to the degradation of quality of service.

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