Frame/multiframe structure FDMA system and corresponding signal
First Claim
1. Digital half-duplex frequency division multiple access radio system in which a mobile station is either sending or receiving, wherein for each call between a mobile station and a base station, a first frequency is allocated for the up link direction, from the mobile station to the base station, and a second frequency is allocated for the down link direction, from the base station to the mobile station, the signals exchanged by said stations are organized in frames of predetermined fixed duration grouped into multiframes comprising a predetermined number of frames and each multiframe including at least one control frame, at least some of said control frames being listening frames during which the sending mobile station interrupts sending, switches to receive mode and, if appropriate, reverts to send mode.
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Accused Products
Abstract
In a digital half-duplex frequency division multiple access radio system a mobile station is either sending or receiving. For each call between a mobile station and a base station, a first frequency is allocated for the up link direction (from the mobile station to the base station) and a second frequency is allocated for the down link direction (from the base station to the mobile station). The signals exchanged by the stations are organized in frames of predetermined fixed duration grouped into multiframes comprising a predetermined number of frames including at least one control frame. At least some of the control frames are listening frames during which the sending mobile station interrupts sending, switches to receive mode and (if appropriate) reverts to send mode.
57 Citations
19 Claims
- 1. Digital half-duplex frequency division multiple access radio system in which a mobile station is either sending or receiving, wherein for each call between a mobile station and a base station, a first frequency is allocated for the up link direction, from the mobile station to the base station, and a second frequency is allocated for the down link direction, from the base station to the mobile station, the signals exchanged by said stations are organized in frames of predetermined fixed duration grouped into multiframes comprising a predetermined number of frames and each multiframe including at least one control frame, at least some of said control frames being listening frames during which the sending mobile station interrupts sending, switches to receive mode and, if appropriate, reverts to send mode.
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19. Digital radio signal exchanged between a mobile station and a base station in a frequency division multiple access half-duplex system, the mobile stations being either in send mode or in receive mode, wherein for each call between a mobile station and a base station a first frequency is allocated for the up link direction, from the mobile station to the base station) and a second frequency is allocated for the down link direction from the base station to the mobile station;
said signal is organized in frames of predetermined fixed duration grouped into multiframes comprising a predetermined number of frames including at least one control frame, at least some of said control frames being listening frames during which the sending mobile station interrupts sending, changes to receive mode and then, if appropriate, returns to send mode.
Specification