Automatic frequency control system corresponding to multiple base stations in wireless communication system

An automatic frequency control and automatic frequency technology, which is applied in the communication between multiple stations, wireless communication, radio/induction link selection and arrangement, etc., can solve the problem of increasing the difficulty of the equalizer, and reduce the difficulty and frequency error. , the effect of large frequency error

Inactive Publication Date: 2007-07-18
MEDIATEK INC
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Problems solved by technology

[0008] In addition, when the mobile communication device 12 periodically detects the signal of the adjacent base station 16, the purpose of this periodic detection of the signal of the adjacent base station 16 is to track the signal strength of the serving base station 14 and the adjacent base station 16 as a It is a reference to decide whether to switch the base station providing communication services from the serving base station 14 to a candidate base station 32 in the neighboring base stations 16, so the mobile communication device 12 will not change its first timing signal 26a during the detection process, so the mobile communication device The first timing signal 26a of 12 is not synchronized with the second timing signal 34 of the candidate base station 32, so its frequency error 28a must be smaller than the range that the receiver / equalizer (equalizer; EQ) can tolerate to avoid being unable to track neighboring base stations 16, which also increases the difficulty of equalizer design

Method used

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  • Automatic frequency control system corresponding to multiple base stations in wireless communication system
  • Automatic frequency control system corresponding to multiple base stations in wireless communication system
  • Automatic frequency control system corresponding to multiple base stations in wireless communication system

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Embodiment Construction

[0046] Please refer to FIG. 1 and FIG. 3 . FIG. 3 is a schematic diagram of the automatic frequency tracking system 36 of the present invention. The automatic frequency tracking system 36 is applied in a mobile communication device 12 of a wireless communication system 10, and is used for providing services to a serving base station 14 (serving base station) of the mobile communication device 12. The basic timing signal 24 of the serving base station and at least one The surrounding timing signal 52 of the surrounding base station 16 (surrounding base station) performs automatic frequency tracking, wherein the surrounding timing signal 52 is a fundamental frequency timing signal converted from a radio frequency signal (RF) received by the mobile communication device 12 . And when the mobile communication device 12 switches from the serving base station 14 to a candidate base station 32 in the adjacent base station 16, it is used to synchronize a first timing signal 26b of the m...

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Abstract

The system includes a parameter database, a control module and an automatic frequency controller. The parameter database stores groups of automatic frequency control parameter corresponding to each adjacent base station. The control module executes a parameter generation program in order to make the automatic frequency controller generate groups of automatic frequency control parameter, and store these groups of automatic frequency control parameter to the parameter database. When mobile communication device is switched from service station to the candidate base station, group of automatic frequency control parameter corresponding to the candidate base station is picked up from the parameter database, receiving group of automatic frequency control parameter corresponding to the candidate base station, the automatic frequency controller updates first sequence signal in order to synchronize second sequence signal.

Description

technical field [0001] The invention relates to an automatic frequency tracking system of a mobile communication device in a wireless communication system, in particular to an automatic frequency tracking system corresponding to multiple base stations. Background technique [0002] "Synchronization" in wireless communication systems is one of the main issues in signal reception technology. Due to the characteristic differences of electronic components, the influence of environmental factors and the Doppler effect, etc., the frequency of the signal received by the mobile communication device often deviates from the frequency value of the standard basic timing sequence, resulting in a frequency error, and the signal does not occur. Synchronization problem. [0003] In order to overcome this problem, known wireless communication systems all have devices or software similar to automatic frequency controllers (automatic frequency controller, AFC), which can adjust the basic timi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/32H04Q7/30H04Q7/20H04B7/26H04B17/00H04W36/36H04W56/00
Inventor 袁帝文
Owner MEDIATEK INC
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