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Method and apparatus for cell identification for uplink interference avoidance using inter-frequency measurements

A technology for inter-frequency measurement and cell identification, applied in the field of CDMA systems

Inactive Publication Date: 2006-07-12
NOKIA CORP
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Identifying a cell based on a second measurement

Method used

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  • Method and apparatus for cell identification for uplink interference avoidance using inter-frequency measurements
  • Method and apparatus for cell identification for uplink interference avoidance using inter-frequency measurements
  • Method and apparatus for cell identification for uplink interference avoidance using inter-frequency measurements

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Embodiment Construction

[0013] The details shown here are taken as examples of, and to facilitate illustrative discussion of, embodiments of the invention. The description taken in conjunction with the drawings makes apparent to those skilled in the art how to embody the invention in practice.

[0014] Furthermore, to avoid obscuring the present invention, and in view of the fact that details regarding the implementation of such block diagram schemes are highly dependent on the platform in which the invention is to be implemented, schemes may be represented in block diagram form, i.e., as seen by those skilled in the art Within, the details should be known. Where specific details (eg, circuits, flowcharts) are set forth in order to describe example embodiments of the invention, it will be apparent to those skilled in the art that the invention may be practiced without these specific details. Finally, it is apparent that any combination of hardware circuitry and software instructions may be used to i...

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Abstract

A method and system for cell identification for uplink interference avoidance that includes a network device and a mobile device in a communications network. Inter-frequency measurements are performed by a mobile device on a downlink-carrier not currently used by the mobile device (S1). A result of the inter-frequency measurements is compared with another value (S2). Second measurements are initiated on the downlink carrier currently not used by the mobile device based on the comparison (S3). A cell is identified based on the second measurements (S4). The inter-frequency measurements may include received signal strength indicator (RSSI) measurements, received signal code power (RSCP) measurements, or average channel power-to-total signal power ratio (Ec / Io) measurements. The second measurements may include signal quality measurements.

Description

technical field [0001] The present invention relates to CDMA systems, and more particularly to cell identification using inter-frequency measurements in CDMA systems. Background technique [0002] In Code Division Multiple Access (CDMA) systems, the Soft Handover (SHO) range is similarly characterized by a strong pilot power signal (CPICH Ec / Io in Wideband CDMA (WCDMA)). Pilot power is measured by the mobile device in idle mode as well as in connected mode. In connected mode, it is important that the mobile equipment (UE) is always connected with the best cell. Otherwise, it will cause significant interference in the uplink and waste network capacity. In idle mode it is important to camp on the strongest cell in order to allow quick start of the call and not cause interference during call start. [0003] With the help of (1) soft handover within one frequency based on downlink CPICH Ec / Io measurement, or (2) in the presence of adjacent channel interference, the downlink e...

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Application Information

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IPC IPC(8): H04B17/00H04B17/345H04B17/382
Inventor 哈里・霍尔曼乌韦・施瓦策彼得・穆审斯基
Owner NOKIA CORP
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