Mobile station and method for allocating finger thereof in CDMA communication system

• US 20030072281A1
• Filed: 10/11/2001
• Published: 04/17/2003
• Est. Priority Date: 10/11/2000
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Hirata, Masaru
• Granted Patent: US 7,149,241 B2
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04B 1/7085 using a code tracking loop, e.g. a delay-locked loop
• CPC Class Codes: H04B 1/7117 Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers

Abstract

A finger allocating section 5 allocates path timings corresponding to peak positions of a plurality of radio waves detected by a delay profile section 4 to separate finger sections 6, respectively, and further decides a path tracking range in each of the finger sections 6 on the basis of respective distances of peak positions in the plurality of radio waves. For instance, when distances of peak positions in a plurality of radio waves being arrived from a base station 20 are narrow from one another, the finger allocating section narrows a path tracking range in each of the finger sections 6. In each of the finger sections 6, a path tracking range is variable. Digital base band signals converted by an AD section 3 are inversely spread within a path tracking range decided by the finger allocating section 5 among segments positioned before and after a path timing allocated by the finger allocating section 5, whereby a plurality of radio waves can be positively received in even a case where distances of peak positions in a plurality of radio waves being arrived from a base station to a mobile station are narrow from one another, so that deterioration in reception property is prevented.

Claims

1. A mobile station in CDMA communication system wherein the mobile station is composed of a plurality of finger sections in each of which each of plural radio waves being arrived from a base station through a plurality of paths is inversely spread to regenerate data from said base station, and a finger allocating section for allocating a path timing corresponding to each peak position of said plurality of radio waves to each of said plurality of finger sections;

each of said plurality of radio waves is inversely spread in a path tracking range among segments positioned before and after the path timing allocated by said finger allocating section comprising;

said path tracking range being variable in each of said plurality of finger sections.

2. A mobile station in CDMA communication system as claimed in claim 1, wherein:

said finger allocating section instructs said path tracking range with respect to each of said plurality of finger sections; and

each of said plurality of finger sections makes variable said path tracking range on the basis of the instruction by said finger allocating section.

3. A mobile station in CDMA communication system as claimed in claim 2, wherein:

said finger allocating section decides said path tracking range in each of said plurality of finger sections on the basis of each distance of peak positions in said plurality of radio waves.

4. A mobile station in CDMA communication system as claimed in claim 3, wherein:

said mobile station in CDMA communication system is composed of an antenna for receiving a plurality of radio waves being arrived from said base station through said plurality of paths;

an RF section for converting the plurality of radio waves received by said antenna into analog base band signals;

an A/D section for converting the analog base band signals converted by said RF section into digital base band signals;

a delay profile section for inversely spreading the digital base band signals converted by said A/D section in every predetermined periods of time to detect the respective peaks of said plurality of radio waves; and

a rake synthesizing section for synthesizing data regenerated in each of said plurality of finger sections;

said finger allocating section allocates a path timing corresponding to each peak position of the plurality of radio waves detected by said delay profile section to each of said plurality of finger sections, and further decides said path tracking range in each of said plurality of finger sections on the basis of each of distances of peak positions in the plurality of radio waves detected by said delay profile section;

besides, each of said plurality of finger sections spreads inversely the digital base band signals converted by said A/D section within a path tracking range decided by said finger allocating section among segments positioned before and after each of path timings allocated by said finger allocating section, whereby data from said base station is regenerated.

5. A method for allocating a finger of a mobile station in CDMA communication system involving a plurality of finger sections for spreading inversely each of a plurality of radio waves being arrived from abase station through a plurality of paths to generate data from said base station, comprising the steps of:

detecting each peak of said plurality of radio waves to allocate a path timing corresponding to each peak of the positions detected to each of said plurality of finger sections; and

deciding a path tracking range in each of said plurality of finger sections;

said plurality of radio waves being inversely spread within said path tracking rage among-segments positioned before and after said path timing in each of said plurality of finger sections.

6. A method for allocating a finger as claimed in claim 5. wherein:

said path tracking range in each of said plurality of finger sections is decided on the basis of each distance of peak positions in said plurality of radio waves.