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Advanced handover for adaptive antennas

A radio and radio link technology, applied in wireless communication, electrical components, network planning, etc., can solve problems such as reducing capacity and consuming resources

Inactive Publication Date: 2011-06-29
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process not only consumes resources used for signal transmission within the network, but also reduces capacity because some radio links are sent over wide fanned beams instead of narrow beams with high gain

Method used

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  • Advanced handover for adaptive antennas
  • Advanced handover for adaptive antennas
  • Advanced handover for adaptive antennas

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Embodiment Construction

[0033] In order to better understand the present invention, it may be useful to begin with a brief overview and analysis of the prior art.

[0034] In WCDMA, for example, handover measurements and signaling are always based on the Primary Common Pilot Channel P-CPICH, which is the basis for all measurements within the system. The signal is measured as a unique sequence in each cell by all terminals in the system. It can be proven that this signal is a signal defining a cell within a WCDMA system. Since this signal needs to be the same throughout the cell, some problems arise when using several narrow beams to cover a cell (eg when applying beamforming in this system). For example, the handover mechanism is based on quality measurements on the P-CPICH. The UE constantly measures the pilot quality from neighboring cells and this pilot quality is reported to the Radio Network Controller (RNC). If certain requirements are met, for example, the quality of the pilot signal is abo...

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PUM

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Abstract

Handover is a main function that is used to support mobility in the network. In a cellular communication network having adaptive antennas for enabling narrow beam operation, it is assumed that a mobile unit is served by an active cell set (Sl). A basic idea according to the present invention is to select, prior to establishment of a new serving radio link for a mobile unit, a narrow target beam within a neighbor area of the current active cell set of the mobile unit based on pre-established information of narrow beams within the neighbor area (S2), and to initiate establishment of the new serving radio link directly with the selected narrow target beam (S3). In this way, the narrow target beam can be selected at handover initiation and the new radio link can be established directly with atarget narrow beam without first establishing the radio link with a cell-wide beam and then, after uplink measurements, reconfiguring the radio link onto a narrow beam.

Description

technical field [0001] The present invention relates generally to wireless or cellular communications, and more particularly to switching for adaptive antennas. Background technique [0002] The use of adaptive or smart antennas is seen as one of the key features to increase the coverage and capacity of wireless systems such as WCDMA. When beamforming is applied in a base station, several narrower beams can be generated compared to sector / cell beams to maintain coverage within a cell. Figure 1A A sector cell antenna beam is shown. While sectored antennas are useful for delivering broadcast and / or control information to all mobile stations within a sectored cell, adaptive antennas can be used to transmit and receive within narrow beams covering only a portion of the sectored cell. Figure 1B An example of a narrow antenna beam is shown. Figure 2 illustrates an example of a cellular network with a base station transmitting a fanned beam, a base station transmitting one of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/08H04W16/28
CPCH04W36/30H04W16/28
Inventor B·哈格曼B·戈兰森D·英贝尼
Owner TELEFON AB LM ERICSSON (PUBL)