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Timing control of transmission time slot

A time slot and timing technology, applied in the field of timing control, can solve the problems of slow change of clock frequency timing relationship, timing out of synchronization, interference, etc.

Inactive Publication Date: 2003-12-10
PENDRAGON WIRELESS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, there may be timing out-of-synchronization between the two systems, such that mobile stations of the two systems may generate signals on the same frequency and at the same time, which may cause interference
[0005] Interference levels may also vary over time due to so-called sliding interferers, whereby differences in clock frequencies result in slow changes in the timing relationship between the two systems

Method used

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  • Timing control of transmission time slot
  • Timing control of transmission time slot
  • Timing control of transmission time slot

Examples

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Embodiment Construction

[0033] Figure 1 shows the coverage provided by two local area networks with a common frequency band for the base stations of the two systems, which may thus lead to interference between communication signals transmitted within each system. An example of this local area network is the DECT communication system.

[0034] A first office block 10 and a second office block 20 are shown in FIG. 1 . The first office block 10 requires two base stations 12, 14 to provide coverage area 16, which includes all parts of the building. The adjacent building 20 is equipped with a single base station 22 to provide a coverage area 24 including the building 20 . When two systems are arranged in an uncoordinated manner, the potential for interference and shared problems arises. Specifically, in the hatched area 26 (which is within two office blocks), a mobile station can receive information from both base stations 14, 22, and signals occurring at the same time and frequency will interfere with ...

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Abstract

A method of controlling the timing of a transmission time slot within a time frame comprises transmitting information over a channel in an allocated time slot at an allocated channel frequency, measuring a received interference level at the channel frequency around the start and around the end of the time slot, analysing the measured interference levels to detect the presence or absence of interferers at the channel frequency around the start and around the end of the time slot, and, if required, adjusting the timing of subsequent time slots for the channel to reduce interference from the detected interferers. Transmission slot timing of the invention enables dynamic avoidance of interference, which can therefore avoid both intermittent and continuous interferers, and can result in synchronisation of different systems to avoid sliding interferers. This method also enables the throughput of the communication system to be largely unaffected.

Description

technical field [0001] The invention relates to the timing control of transmission slots within a time frame of a communication system which assigns different time slots within the time frame to different communication channels. Background technique [0002] Various multiplexing techniques are known for use in communication systems, which include dividing a time frame into time slots for different channels. Time Division Duplex (TDD) is a technique used to establish full-duplex communication, with forward and reverse links occurring on the same frequency, but separated in time to avoid collisions. Time division multiple access is a scheme in which transmissions to or from multiple users are separated in time in order to avoid collisions. It is also possible to combine time division techniques with frequency division techniques. [0003] The invention relates in particular to interference which may affect signal transmission during a given time slot,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/00H04B7/005H04B7/24H04B7/26H04B17/00H04J3/06
CPCH04B17/005H04B17/345H04B7/2681H04W56/0045H04B7/005
Inventor T·J·穆斯里
Owner PENDRAGON WIRELESS LLC