Active set selection method for determining cells to be deleted from an active set based on the reception state of an uplink high-speed signal

A high-speed signal, receiving state technology, applied in the field of active set selection, can solve the problems of meaningless monopoly, waste of hardware resources, time-consuming addition and deletion, etc., to achieve high efficiency and suppress waste.

Inactive Publication Date: 2006-06-07
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, in the prior art, the mobile terminal determines the base stations included in the active set according to the downlink reference signal, which will lead to meaningless monopoly of the base station hardware resources such as the despreading equipment
[0024] In addition, the prior art CDMA mobile communication system takes time to control the addition and deletion to and from the active set between the mobile terminal and the RNC, and will result in further waste of hardware resources

Method used

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  • Active set selection method for determining cells to be deleted from an active set based on the reception state of an uplink high-speed signal
  • Active set selection method for determining cells to be deleted from an active set based on the reception state of an uplink high-speed signal
  • Active set selection method for determining cells to be deleted from an active set based on the reception state of an uplink high-speed signal

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0054] Figure 4 Shows a method by which when the uplink high-speed signal is in the handover state, when the base station constituting the cell in the active set receives the uplink high-speed signal from the mobile terminal, the RNC performs the deletion of the active set control.

[0055] The CDMA mobile communication system of this embodiment is equipped with an RNC (Radio Network Controller) 200 and base stations 100 and 101. The following description relates to a case where the mobile terminal 1 moves from the cell 110 including the base station 100 to the cell 111 including the base station 101.

[0056] Such as Figure 4 As shown, the base stations 100 and 101 constituting the cells 110 and 111 (included in the active set for the mobile terminal 1) not only transmit the downlink for specifying the transmission power and transmission rate of the uplink high-speed signal from the mobile terminal 1. It also measures the reception status of the uplink high-speed signal (for e...

no. 2 example

[0071] The following description relates to an active set selection method according to the second embodiment of the present invention.

[0072] In the active set selection method according to the above-mentioned first embodiment, the RNC initiates the deletion of the active set according to the reception state of the uplink high-speed signal measured by the base station. In contrast, the active set selection method according to the second embodiment of the present invention proposes a method for controlling the deletion of the active set under the guidance of the base station.

[0073] When the mobile terminal performs handover between cells, the base station in this embodiment measures the reception status of the uplink high-speed signal on the wireless line of the mobile terminal, which is determined based on the measurement result of the measured uplink high-speed signal. Cells to be deleted from the active set and report a request to the RNC in order to disconnect the uplink ...

no. 3 example

[0093] The following description relates to the active set selection method according to the third embodiment of the present invention.

[0094] In the above-mentioned first and second embodiments, the active set deletion guard time is set, so that although the receiving SIR of the uplink high-speed signal of a specific cell drops to or below the active set deletion SIR threshold, it will not be deleted from the active set The cell, until the active set deletion protection time has elapsed. However, in a case where the radio wave state of a specific cell dynamically changes due to the movement of the mobile terminal 1, sometimes it is preferable to delete the cell from the active set without waiting for the active set deletion guard time to elapse.

[0095] The active set selection method of this embodiment takes this type of situation into consideration. Therefore, when performing active set deletion, RNC or each base station uses two values, the first active set deletion SIR thr...

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Abstract

Each base station measures the reception status of the uplink high-speed signal from the mobile terminal and periodically reports the measurement results to the radio network controller (RNC). The RNC determines the cells to be deleted from the active set based on the reception status reported from each base station (eg, received SIR). The RNC sends a wireless line release request to a base station and a mobile terminal for releasing the wireless line set for the uplink high-speed signal of the cell that has been determined to be deleted from the active set. Each base station and mobile terminal that receives a radio line release request from the RNC releases the radio line, thereby removing the cells of other base stations from the active set.

Description

Technical field [0001] The invention relates to an active set selection method, which is used for uplink high-speed signals of a mobile communication system. Background technique [0002] As a mobile communication system, in a CDMA mobile communication system that has attracted attention in recent years, a mobile terminal can set up wireless lines to multiple base stations at the same time. Therefore, when a mobile station moves within the communication area of ​​multiple base stations, the mobile terminal performs handover while setting up the wireless lines to the multiple base stations. Through the handover, the mobile terminal is switched to the base station connected to it, so it can move without interruption. Open its line. When performing this type of handover in a CDMA mobile communication system, a cell whose wireless line is set to a mobile terminal is managed as an active set. In other words, the active set indicates a list of cells in which the wireless line is set as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04B1/7083H04W36/08H04W36/30H04W48/20H04W88/08H04W88/12
CPCH04W36/18H04W36/30H04W88/08H04W88/12
Inventor 长谷场幸雄近藤大辅佐久间惠美子西村长实河端尚岩崎玄弥
Owner NEC CORP
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