Method to estimate multiple round trip delays attached to cellular terminals

A round-trip delay and terminal technology, applied in multiplexing communication, code division multiplexing systems, synchronization devices, etc., can solve the problems of increased self-noise and reduced accuracy of RTD estimation of round-trip delay

Active Publication Date: 2007-11-14
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The current problem is that when a fixed correlation window is used to minimize the size of the signature reception slot, the self-noise generated by the correlation process increases and the round-trip delay RTD estimation accuracy decreases

Method used

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  • Method to estimate multiple round trip delays attached to cellular terminals
  • Method to estimate multiple round trip delays attached to cellular terminals
  • Method to estimate multiple round trip delays attached to cellular terminals

Examples

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Embodiment Construction

[0035] In FIG. 1, three structures of a single-terminal mobile communication system 2 are shown. A single-terminal mobile communication system 2 comprises a user terminal 4 denoted T1 and a base station 6 denoted BS. In the first configuration, the terminal 4 is positioned at a first position denoted P1. In the second configuration, the terminal 4 is positioned at a second position denoted P2. In the third configuration, the terminal 4 is positioned at a third position denoted P3. Since P1 is close to the BS, P2 is farther from the BS, and P3 is farthest from the BS.

[0036] At each position P1, P2, P3, the terminal 4 is able to receive the same downlink signal 8 sent from the BS, but with a different propagation path delay.

[0037] At each position P1, P2, P3, the terminal is able to transmit a corresponding uplink signal 10, 12 and 14.

[0038] The time required for base station 6 to send data to mobile 4 and to receive the same data again after retransmission by termi...

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Abstract

The method for estimating a propagation round trip delay, existing between a base station and a terminal, and comprised within a predetermined round trip delay range, comprises the following steps: transmitting from the base station on a downlink a start order signal (30) to the terminal, after reception by the terminal of the end of the start order signal, sending a signature signal from the terminal to the base station on a uplink, receiving at the base station within a signature receiving time slot (28) the signature signal (34, 38, 42), processing at the base station the received signature signal to provide a round trip delay information. The processing step comprises a cyclic correlation step performed within a fixed correlation time window (54) by using a unique reference sequence (48).

Description

technical field [0001] The present invention relates to a method for estimating multiple round-trip delays attached to a cellular terminal from RACH signals received in dedicated time slots multiplexed on an uplink traffic multiplex frame. Background technique [0002] In a cellular like UMTS that includes an uplink (UL) from a group of terminals (T) to a base station (BS) and a downlink (DL) from the base station (BS) to each terminal (T) of the group In a communication system, it is well known that a random access channel (RACH) is provided in the time domain, and the RACH and uplink (UL) traffic are time multiplexed. [0003] In the uplink, random access is usually contrasted with scheduled traffic, where a timing advance mechanism is used to keep the traffic channels tightly synchronized. [0004] Indeed, a terminal uses random access when no uplink resources (in terms of time, code and / or frequency) are allocated to the terminal by the base station (BS). For example, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q7/38H04B1/707H04J13/00H04W56/00
CPCH04J13/0062H04W56/009H04L27/2655H04L27/2675
Inventor L·布鲁尼尔B·杰乔克斯
Owner MITSUBISHI ELECTRIC CORP
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