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Mobile communication system, radio base station apparatus, and method for determining uplink reception synchronization

A technology of a mobile communication system and a radio base station, applied to a radio base station device, determines the synchronization field in an uplink reception compressed mode, and can solve problems such as communication quality interference

Inactive Publication Date: 2004-06-16
NEC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, the determination of uplink reception synchronization involves power control, so it will cause obvious interference to other users, communication quality, etc.

Method used

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  • Mobile communication system, radio base station apparatus, and method for determining uplink reception synchronization
  • Mobile communication system, radio base station apparatus, and method for determining uplink reception synchronization
  • Mobile communication system, radio base station apparatus, and method for determining uplink reception synchronization

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Embodiment Construction

[0030] Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a radio base station apparatus according to an embodiment of the present invention. In FIG. 1, the radio base station apparatus according to this embodiment includes a despreading processor 1, a compressed frame determination section 2, a symbol determination section 3, a downlink transmission power controller 4, and a reception SIR (signal-to-interference power ratio) Determination section 5, TPC (Transmit Power Control) bit determination section 6, pilot bit error determination section 7, soft decision TFCI (Transport Format Combination Indicator) decoder 8, TFCI bit error determination section 9, TFCI decoding characteristic determination section 10 , and the uplink radio synchronization state determination section 11.

[0031] Fig. 5 shows an uplink DPCCH (Dedicated Physical Control Channel) slot format. FIG. 6 shows a c...

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Abstract

A radio base station apparatus capable of improving accuracy of synchronization detection and making stable determination of reception synchronization without erroneous synchronization determination is provided. A TFCI bit error determination section re-encodes a decoded TFCI value, and computes the difference between the re-encoded TFCI symbol and a hard-decided symbol of the received TFCI symbol. A TFCI decoding characteristic determination section computes a characteristic indicator value from a correlation result of Fast Hadamard Transform used in a soft decision TFCI decoder. An uplink radio synchronization state determination section determines state transitions of the uplink synchronization state by using synchronization state determination parameters, a reception SIR value computed by a reception SIR determination section, the number of pilot error bits computed by a pilot bit error determination section, the number of error TFCI bits computed by the TFCI bit error determination section, and the TFCI decoding characteristic indicator value computed by the TFCI decoding characteristic determination section.

Description

technical field [0001] The present invention relates to a mobile communication system, a radio base station apparatus, and a method of determining uplink reception synchronization. More specifically, the present invention relates to a method of determining synchronization in uplink reception compressed mode. Background technique [0002] A radio base station device according to the IMT-2000 (International Mobile Telecommunications-2000) standard employs a compressed mode. Compressed mode is employed by higher layer devices and other systems, such as FDD (Frequency Division Duplex), TDD (Time Division Duplex), and GSM (Global System for Mobile Communications), for measurements in handover between different frequencies Result set (for example, refer to 3GPP TS 25.133, 8, "UE measurement procedure"). [0003] Compressed mode is a function by which cells of different frequencies can be measured to perform handover between different frequencies. A single-receiver mobile statio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04W56/00
CPCH04W56/0085H04B7/2668
Inventor 内藤贵弘
Owner NEC CORP
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