Method for measuring interference of adjacent cell in downlink direction based on CDMA system

A technology of adjacent cell interference and measurement methods, applied in wireless communication, electrical components, etc., can solve problems such as inaccurate measurement, achieve the effect of improving accuracy and estimation accuracy

Inactive Publication Date: 2011-05-11
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problem of inaccurate measurement existing in the prior art

Method used

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  • Method for measuring interference of adjacent cell in downlink direction based on CDMA system
  • Method for measuring interference of adjacent cell in downlink direction based on CDMA system
  • Method for measuring interference of adjacent cell in downlink direction based on CDMA system

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Experimental program
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Effect test

Embodiment 1

[0031] When the present invention is applied to a CDMA-FDD system and adopts a smart antenna. Refer to attached figure 1 , the measurement method of the adjacent cell interference in the downlink direction includes the following steps:

[0032] 101) When the UE is handed over, the UE reports the intra-frequency handover measurement event 1G or the inter-frequency handover measurement event 2A, and at the same time carries the UTRA Carrier RSSI measurement value RSSI of the carrier frequency where the target cell is located, or the UE periodically reports the UTRA Carrier RSSI, RNC (Radio Network Controller, radio network controller) obtains the report of the period before the handover occurs.

[0033] 102) The UE reports the path loss PL to the base station of the source cell org and the path loss PL to the base station of the target cell dst .

[0034] 103) The RNC obtains the transmit power P of the base station of the source cell to the UE tx_org and target cell transm...

Embodiment 2

[0043] When the present invention is applied to a CDMA-FDD system without using a smart antenna. The method for measuring the interference of adjacent cells in the downlink direction is similar to the first embodiment, the difference is that the average suppression factor of the interference between the users of the cell by the smart antenna in step 106 and step 107 The value is 1.

Embodiment 3

[0045] When the present invention is applied to a CDMA-TDD system and adopts a smart antenna. Refer to attached figure 1 , the measurement method of the adjacent cell interference in the downlink direction includes the following steps:

[0046] 101) When the UE is handed over, the UE reports the intra-frequency handover measurement event 1G or the inter-frequency handover measurement event 2A, and at the same time carries the UTRA Carrier RSSI measurement value RSSI of the carrier frequency where each downlink service time slot of the target cell is located, or the UE periodically reports the UTRA Carrier RSSI , the RNC fetches the report of the cycle before the handover occurs.

[0047] 102) The UE reports the path loss PL to the base station of the source cell org and the path loss PL to the base station of the target cell dst .

[0048] 103) The RNC obtains the transmit power P of the base station of the source cell to the UE tx_org and the transmission carrier power l...

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Abstract

The invention discloses a method for measuring the interference from adjacent cells in the downlink direction based on a CDMA system. The method of the invention comprises the steps that: 1) the RSSI of a carrier frequency where a target cell locates is obtained when UE is switched; 2) the transmission code power (TCP) of the base station of a source cell to the UE and the interference to the UE by other users of the cell are then obtained; 3) when the UE is switched to a target cell with the same frequency, the interference from the adjacent cells in the downlink direction to the UE is RSSI - the transmission code power (TCP) of the base station of the source cell to the UE - the interference to the UE by other users of the cell; 4) when the UE is switched to a target cell with the same frequency, the interference from the adjacent cells in the downlink direction to the UE is RSSI - the interference to the UE by other users of the cell. By adopting the method of the invention, the accuracy for measuring the interference from downlink adjacent cells of the CDMA system can be improved, thereby improving the accuracy for estimating the algorithm of downlink admission control and open-loop power control during the process that the UE is switched and also effectively improving the call completion ratio and the stability of the system.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for measuring the interference of adjacent cells in the downlink direction in a CDMA (Code Division Multiple Access, Code Division Multiple Access) system. Background technique [0002] The CDMA system is a power and interference limited system. When there are too many users in the system and the wireless environment is relatively bad, the situation of load overload will occur, which is manifested as: UEs (User Equipment, user equipment) in the uplink direction will each increase their respective uplink transmission power, and each UE in the downlink direction will Vicious competition between the total transmission power of the base station; finally, the entire system interferes too much with each other and cannot break through the power bottleneck, and the Qos (Quality of Service, service quality) of all users is seriously reduced, which eventually leads to a large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/30H04W24/02
Inventor 周捷
Owner ZTE CORP
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