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A multimode wireless terminal

A wireless terminal and evaluation module technology, applied in wireless communication, electrical components, synchronization devices, etc., can solve problems such as long delay and poor signal quality, and achieve the goal of reducing delay time, reducing hardware overhead, and reducing complexity Effect

Active Publication Date: 2016-05-11
TANGSHAN CAOFEIDIAN LIANCHENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of course, if the wireless terminal stays in the main mode GSM cell forever, there will be no problem; but if the signal quality of the original GSM cell deteriorates as the terminal moves, and the TD-SCDMA cell strength exceeds the predetermined threshold, then the wireless The terminal will switch to the TD-SCDMA cell. Since the TD-SCDMA and GSM networks are not synchronized, the multi-mode wireless terminal needs to synchronize the TD-SCDMA network first, and then start the TD-SCDMA cell measurement under synchronization, and then transmit service data. The time delay during

Method used

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  • A multimode wireless terminal
  • A multimode wireless terminal
  • A multimode wireless terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1, the wireless terminal performs synchronization measurement.

[0039] Such as image 3 As shown, if it is estimated that the TDD neighboring cell is a reliable synchronization object, then the wireless terminal continues to only measure the pilot signal of the synchronization object cell, and estimates its own synchronization error through coherent detection, and then adjusts the timer to eliminate the error .

[0040] And, the wireless terminal continues to save the cell as a synchronization object in the next maintenance cycle.

Embodiment 2

[0041] Embodiment 2, the wireless terminal performs asynchronous measurement.

[0042] Such as Figure 4 As shown, if the TDD neighbor cell is evaluated as unreliable, the wireless terminal discards the cell, continues to measure all the TDD neighbor cells listed in the neighbor cell list, and selects the cell with the strongest signal strength. Same as previous description:

[0043] For TD-SCDMA adjacent cells, the RSCP value of the cell pilot signal is measured, and the adjacent cell with the largest RSCP value is selected;

[0044] For TDD-LTE adjacent cells, the RSRP value or RSRQ value of the pilot signal of the cell is measured, and the adjacent cell with the largest RSRP value or RSRQ value is selected.

[0045] Then, the wireless terminal takes the strongest TDD neighboring cell as a synchronization object, performs pilot signal measurement, estimates its own synchronization error through coherent detection, and then adjusts a timer to eliminate the error.

[0046] An...

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Abstract

The invention provides a TDD (time division duplex) wireless multimode terminal which comprises a measurement synchronous estimation module, a synchronous measurement module, a non-synchronous measurement module and a timer. When a TDD operates under a non-main-mode, the measurement synchronous estimation module measures and estimates adjacent cells of the TDD of the original synchronous object in each synchronous maintaining period, and if the estimation result is that the adjacent cells are reliable in synchronism, the synchronous measurement module is started to regulate a synchronous timer on the basis of the synchronous object cells; otherwise, the original synchronous object cells are discarded; the non-synchronous measurement module is started to measure all TDD cells in an adjacent cell list, and the strongest cell is selected to be used as a synchronous object and regulate the synchronous timer. The multimode terminal provided by the invention can be switched to operate in a TDD main mode rapidly at the cost of slightly increasing the complexity, reduces the service switch time delay, and has better user experience.

Description

technical field [0001] The invention relates to the field of mobile communication. Specifically, a multi-mode wireless terminal is provided, at least one of the multi-modes of the wireless terminal is a TDD mode, such as the TD-SCDMA mode in the third generation mobile communication or the TDD-LTE mode in the fourth generation mobile communication. Background technique [0002] As mobile communication networks become more and more complex, multi-mode wireless terminals gradually replace traditional single-mode wireless terminals. The so-called multi-mode wireless terminal is a wireless terminal that supports multiple wireless communication standards. The specific wireless standards include the second-generation mobile communication standard GSM, the third-generation mobile communication standard WCDMA or TD-SCDAMA, and the fourth-generation mobile communication standard TDD- LTE or FDD-LTE and so on. The multi-mode wireless terminal can switch between networks of different...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W24/08H04W56/00H04W88/06
Inventor 李文龙
Owner TANGSHAN CAOFEIDIAN LIANCHENG TECH CO LTD