US2003007470A1

5G,4G,3G

Title

Method and apparatus for time-aligning transmissions from multiple base stations in a CDMA communication system

Application Number:

US20010901831

Family ID:

25414883

View on Espacenet

Publication Date:

09-01-2003

Application Date:

09-07-2001

Priority Date:

09-07-2001

Current Assignee:

QUALCOMM INC

Publication Country:

US

Declaring Company:

QUALCOMM INC

Abstract  Abstract

Schemes to time-align transmissions from multiple base stations to a terminal. To achieve time-alignment differences between the arrival times of transmissions from the base stations as observed at the terminal are determined and provided to the system and used to adjust the timing at the base stations such that terminal-specific radio frames arrive at the terminal within a particular time window. In one scheme a time difference between two base stations is partitioned into a frame-level time difference and a chip-level time difference. Whenever requested to perform and report time difference measurements the terminal measures the chip-level timing for each candidate base station relative to a reference base station. Additionally the terminal also measures the frame-level timing and includes this information in the time difference measurement only if required. Otherwise the terminal sets the frame-level part to a predetermined value (e.g. zero).

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The information in purple was extracted from the FrandAvenue

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