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Apparatus and method for compensating signal arrival time variation in UMTS mobile telephone set

A time-of-arrival and signal technology, applied in wireless communication, communication between multiple stations, digital transmission system, etc., can solve the problems that mobile phones cannot do anything, not the frequency of GSM signal transmission, etc.

Inactive Publication Date: 2003-03-26
LENOVO INNOVATIONS LTD HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The difference between the UMTS and GSM networks of the respective base stations
[0006] 2. Errors in the GSM clock caused by Doppler shift in the frequency of the received GSM signal (due to the movement of the handset relative to the GSM base station), since the GSM clock will track on the received frequency, not the transmission of the GSM signal frequency
[0007] 3. The timing delay of the changes experienced by the UMTS signal arriving at the handset due to the movement of the handset relative to the UMTS base station
[0008] Regarding point 1, nothing can be done in the phone

Method used

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  • Apparatus and method for compensating signal arrival time variation in UMTS mobile telephone set
  • Apparatus and method for compensating signal arrival time variation in UMTS mobile telephone set
  • Apparatus and method for compensating signal arrival time variation in UMTS mobile telephone set

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Embodiment Construction

[0014] The time it takes for a signal to travel from a UMTS base station to a handset can be simply calculated based on the speed of the signal and the distance it has to travel. If the mobile phone is moving along the axis between the receiver and the transmitter, the absolute delay experienced by the signal from the time it is transmitted to the time it is received will be related to the distance traveled and The direction of motion along the axis changes proportionally.

[0015] in such as figure 1 During reception in the existing first mode shown, the handset uses the GSM clock to determine when it expects a UMTS signal to arrive. This is done in step 2, and in step 4 the receive window is opened at the expected arrival time. In block 6 the actual time of arrival of the signal is measured and in step 8 the error between the measured time of arrival and the expected time of arrival is obtained. In step 10 an update to the UMTS time base is obtained from the measured erro...

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Abstract

Time base error in a dual mode mobile telephone is correct by measuring the time of arrival of a signal (6) comparing the time of arrival with an expected time of arrival (2). The time base error is corrected with a measured error signal (10, 12). An average time base error is derived from the measured errors over a predetermined period of time (14). From this, predicted error is used to correct the expected time of arrival of a signal (4).

Description

technical field [0001] The invention relates to a dual mode mobile telephone handset operating in GSM and UMTS networks. Background technique [0002] Dual-mode mobile phone handsets operating in GSM and UMTS networks must perform regular synchronization measurements with the GSM and UMTS networks. This is not a problem when the phone is not talking, as there is enough time to perform all the required measurements. Also, when the phone is talking on the UMTS network, a command can be used to generate gaps in transmission, thereby freeing up time for synchronization with the GSM network. [0003] However, while the phone is talking on the GSM network, measurements on the UMTS network can only be performed during idle periods that are one GSM frame in length and approximately 120 microseconds apart. Some UMTS measurements take more than 120 milliseconds to perform and therefore must be separated on more than one idle frame. Therefore, in order to successfully complete such ...

Claims

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Application Information

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IPC IPC(8): H04L7/00H04B7/26H04W56/00
CPCH04W56/0075
Inventor A·惠勒
Owner LENOVO INNOVATIONS LTD HONG KONG