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US 2001/0017864 A1Published application
SynchronousTDDsystem
AssigneeKoninklijke Philips Electronics N.V.
InventorChristopher Stobart
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AssigneeKoninklijke Philips Electronics N.V.
InventorChristopher Stobart
Estimating the term…
The invention relates to a synchronous TDD system for the transmission of speech and/or data between a master unit (FP) and at least two slave units (PP1, PP2) which are associated with the master unit (FP), and also to a method to be carried out by such a system. In order to enable direct communication between the slave units (PP1, PP2) of the same system despite the regular transmission of synchronization signals to the slave units (PP1, PP2) by the master unit (FP), according to the invention the slave units (PP1, PP2) are rendered ready to receive in fixed time slots in a frequency channel which is not used by the master unit (FP) in these time slots. In these time slots the slave units (PP1, PP2) can receive signals from other slave units (PP1, PP2) of the system in order to initiate a communication between themselves.
A synchronous TDD system for the transmission of speech and/or data between a master unit (FP) and at least two slave units (PP1, PP2) which are associated with the master unit (FP), the master unit (FP) including transmission means for transmitting a synchronization signal (beacon) in fixed time slots and the slave units (PP1, PP2) including respective receiving means for receiving and processing the synchronization signals transmitted by the master unit, the receiving means of the slave units (PP1, PP2) being configured in such a manner that in fixed time slots which are not used for a transmission of synchronization signals they are ready to receive or that in fixed time slots they are ready to receive with a setting which does not allow the reception of signals from the master unit (FP), the slave units (PP1, PP2) also including transmission means which are suitable to use one of the time slots in which the receiving means of the slave units (PP1, PP2) are ready to receive, but reception of signals from the master unit (FP) is not enabled, in order to transmit signals for initiating a communication between themselves.
A synchronous TDD system as claimed in one of the preceding claims, characterized in that the transmission and receiving means of the slave units (PP1, PP2) are suitable to establish, after the initiation of the communication, between themselves a normal TDD connection with a frequency or with a code of an FHSS or a DSSS other than the frequency or code used by the master unit (FP) for the transmission of the synchronization signal.
A synchronous TDD system as claimed in one of the preceding claims, characterized in that the receiving means of the slave units (PP1, PP2) are suitable to continue the reception of synchronization signals from the master unit (FP) during a communication between two slave units (PP1, PP2) in time slots which are not required for this communication.
A method for a synchronous TDD system for the transmission of speech and/or data between a master unit (FP) and at least two slave units (PP1, PP2) which are associated with the master unit (FP), which method includes the following steps:
Dependencies are inferred from the claim text.