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| Circuit and method for automatic memory dialing |
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| Calling method for communication terminal device |
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| Frequency assignment among antennas in a cellular communications network |
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| Menu level indicator for a telephone terminal |
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| Contacting apparatus for a smart card |
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| Method for foiling cellular telephone cloning |
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Method of controlling a communication system and the system employing the method
| Details |
Inventors: Moulsley, Timothy J.;
Assignee: Koninklijke Philips Electronics N.V. (Eindhoven, NL)
Primary Examiner: Ton; Dang
Assistant Examiner: Wilson; Robert W.
Attorney, Agent or Firm: Schmitt; Michael
A method is described of controlling a communication system using a continuous FDD channel. Each time segment of the channel is divided into a predetermined number of sub-segments. For a first set of time segments, the communication signal data for the respective time segment is repeated in all sub-segments, and for a second set of time segments, null periods are provided in one or more of the sub-segments during which the communication signal from the first station to the second station is interrupted. The communication signal data is transmitted during the remaining sub-segments of the second set. This approach enables a slotted transmission mode to be established in a CDMA FDD system, without the need to adapt the spreading ratio of the CDMA system. |
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DETAILED DESCRIPTION FIG.
1 Part A shows one possible frame structure for the down-link communication between a base station and a mobile station.
The signal comprises a number of time frames 2 arranged in sequence.
Typically, a time frame may have a duration of 10 ms.
Each time frame 2 includes user data as well as control data.
The user data and control data may be multiplexed together, or else each time frame may be divided into discrete sections, or each may be carried on a separate physical channel.
For example, each time frame may include a synchronisation sequence and a header in which control data is transmitted.
This invention is particularly concerned with a communication system employing frequency division duplex, in which the transmission and reception signals are essentially continuous.
Of course, various coding and interleaving techniques are additionally possible.
The invention is directed at the particular problem of handover from a frequency division duplex system to other frequencies, to alternative systems, or to other modes of communication supported by an individual system.
In order to make reliable handovers possible, it is necessary for the mobile station to make measurements of the potential replacement channels established by other base stations (or even by the same base station).
For seamless handover to take place, these measurements must be carried out by the mobile station while the existing connection is maintained.
This requires the mobile station to have a second receiver for monitoring alternative channels, or else requires the mobile station to interrupt use of its single receiver periodically.
For this purpose, null periods 4 are possible in the transmission from the base station to the mobile station during which time the mobile station receiver can be allocated to tasks other than reception of information from the base station.
One possible arrangement of the null periods 4 is shown in FIG.
1A, in which each null period 4 occupies approximately half of the frame duration, and is positioned at the beginning of a time frame 2 with a null period for every fourth time frame
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