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Network-based positioning method and reference signal design in ofdma system

A technology for positioning reference signals and positioning methods, which is applied in the field of network-based positioning methods and reference signal design, and can solve problems such as inconsistent positioning accuracy

Inactive Publication Date: 2011-11-30
MEDIATEK INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, in the absence of interference management, positioning accuracy has the potential to fall short of E-911 requirements

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  • Network-based positioning method and reference signal design in ofdma system
  • Network-based positioning method and reference signal design in ofdma system
  • Network-based positioning method and reference signal design in ofdma system

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Embodiment Construction

[0022] Reference will now be made in detail to preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.

[0023] figure 2is a schematic diagram of a cellular OFDM / OFDMA system 20 in accordance with a novel aspect of the present invention. The cellular OFDM / OFDMA system 20 includes multiple BSs: a serving BS (also called eNB in ​​3GPP LTE system) 21 of a serving MS (UE) 24 , a first cooperative BS eNB22 and a second cooperative BS eNB23 . In order to calculate the geographic location of the target UE 24, a network-based location service may be initiated by the network or by the target UE 24 itself. For network-based positioning, the location calculation of the target UE 24 is typically performed by the serving eNB 21 based on certain measurements. For example, the serving eNB21 can estimate the location information of the target UE24 by measuring the reference signal transmitted by the target UE24 and estimating the TOA of the r...

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Abstract

A network-based localization method is proposed. In a wireless communication system, based on network positioning, first a serving BS allocates radio resources to a target UE. Then the target UE transmits the PRS to the serving BS and multiple cooperating BSs at the same time. Then, all cooperative BSs perform PRS detection and TOA measurement. Finally, the serving BS performs location estimation based on the TOA measurements. In a novel aspect, only one PRS transmission is required in a positioning opportunity for a positioning result. Candidate PRSs are allocated in the PRS resource area, and PRSs are selected according to different conditions. In the PRS resource area, multiple positioning opportunities and multiple reference signals can be multiplexed in time domain, frequency domain or code domain. In one embodiment, the PRS is configured such that both radio resource consumption and interference are minimized.

Description

[0001] Related Application Cross Reference [0002] This application claims priority under 35 U.S.C. §119 to Application No. 61 / 261,826, filed November 17, 2009, and entitled "Enhanced Network-Based Positioning Mechanism and Reference Signal Design for Location-Based Service in OFDMA Systems and Resource Mapping for A-MAP-IE in Advanced Wireless OFDMA systems", application number 61 / 302,618, filed February 9, 2010, entitled "Non-Dedicated Schemes for Network-Based Positioning in OFDMA Systems”; application number 61 / 356,095, filed June 18, 2010, entitled “Candidates of Reference Signals and Some Designs for Network-Based Positioning.” The subject matter of these applications are hereby incorporated by reference. technical field [0003] The disclosed embodiments relate generally to wireless network communications, and more particularly to network-based positioning methods and reference signal design in Orthogonal Frequency Division Multiple Access (OFDMA) systems. Backgrou...

Claims

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Application Information

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IPC IPC(8): H04W64/00
CPCH04W64/00
Inventor 黄建华廖培凯陈义升
Owner MEDIATEK INC
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