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Handover control method

A control method and switching request technology, applied in the direction of data exchange network, digital transmission system, electrical components, etc., can solve the problem that the switching cannot be carried out smoothly, and achieve the effect of smooth switching

Inactive Publication Date: 2009-04-01
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In this case, when a handover request is made as the mobile station moves, there is a problem that handover cannot be performed smoothly because there is no high-level device that manages unreceived radio packets and untransmitted radio packets.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0078] The first embodiment is an embodiment in which a radio packet being retransmitted and a radio packet waiting to be scheduled are discarded, and a cell handover is performed simultaneously with a handover request.

[0079] FIG. 5 is a diagram showing an operation example of handover control in the first embodiment, and is a diagram showing a downlink operation. In FIG. 5 , consider a case where the mobile station 5 moves from the cell area of ​​the base station 3A (source cell) to the cell area of ​​the base station 3B (destination cell).

[0080] The mobile station 5 issues a handover request to the base stations 3A and 3B when it determines that handover is necessary based on the reception status of radio signals from the base station 3A and the base station 3B. At this point in time, in the base station 3A, wireless packets waiting for scheduling for which transmission assignment has not been made are buffered in the scheduling buffer 301 , and wireless packets that h...

no. 2 Embodiment

[0089] The second embodiment is an embodiment in which cell switching is performed after the transmission of the radio packet being retransmitted is completed.

[0090] Fig. 9 is a diagram showing an example of operation of handover control in the second embodiment, and is a diagram showing a downlink operation. In FIG. 9 , consider a case where the mobile station 5 moves from the cell area of ​​the base station 3A (source cell) to the cell area of ​​the base station 3B (destination cell).

[0091] The mobile station 5 issues a handover request to the base stations 3A and 3B when it determines that handover is necessary based on the reception status of radio signals from the base station 3A and the base station 3B. At this point in time, in the base station 3A, wireless packets waiting for scheduling for which transmission assignment has not been made are buffered in the scheduling buffer 301 , and wireless packets that have not been received are buffered in the retransmission...

no. 3 Embodiment

[0100] The third embodiment is an embodiment in which cell switching is performed after the transmission of the radio packets being retransmitted and the radio packets waiting for scheduling is completed.

[0101] Fig. 13 is a diagram showing an example of operation of handover control in the third embodiment, and is a diagram showing a downlink operation. In FIG. 13 , consider a case where the mobile station 5 moves from the cell area of ​​the base station 3A (source cell) to the cell area of ​​the base station 3B (destination cell).

[0102] The mobile station 5 issues a handover request to the base stations 3A and 3B when it determines that handover is necessary based on the reception status of radio signals from the base station 3A and the base station 3B. At this point in time, in the base station 3A, wireless packets waiting for scheduling for which transmission assignment has not been made are buffered in the scheduling buffer 301 , and wireless packets that have not be...

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Abstract

Provided is a handover control method for a mobile communication network of a type in which an IP packet is transmitted and received between an access router and a base station. The method includes: a step of receiving a handover request from a mobile station; a step of discarding a packet being retransmitted and a packet waiting for scheduling, waiting for discarding of a packet waiting for scheduling and completion of transmission of a packet being retransmitted, or waiting for completion of transmission of a packet being retransmitted and a packet waiting for scheduling; and a step of switching a cell.

Description

technical field [0001] The present invention relates to a control method of handover (hard handover) in the case where a mobile station moves from a cell area of ​​one base station to a cell area of ​​another base station. Background technique [0002] The IP (Internet Protocol; Internet Protocol) of the mobile communication network is progressing, but the wireless packet is used in the wireless section. Smaller size (size) IP packets are bundled to form wireless packets, and larger size IP packets are divided to form wireless packets. [0003] In the conventional HSDPA (High Speed ​​Downlink Packet Access; High Speed ​​Downlink Packet Access), the radio network controller (RNC: Radio Network Controller; For packet mapping, when a handover request is generated as the mobile station moves, the unreceived wireless packet (wireless packet for which reception has not been confirmed) is continuously retransmitted and untransmitted in the base station of the handover destination ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/34H04W36/02H04W88/02H04L12/56H04L47/22H04W36/38H04W40/34H04W80/04
CPCH04W36/34H04W36/08
Inventor 森本彰人樋口健一佐和桥卫
Owner NTT DOCOMO INC