TDMA for mobile access in a CDMA system
AssigneeTelefonaktiebolaget L M Ericsson
InventorsBjorn Gudmundson, Bengt Persson
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Abstract
A method and system for increasing the capacity of radiotelephone communication systems by eliminating interference to communication traffic caused by random access bursts from unconnected mobile station are disclosed. Access slots are provided in CDMA signals by interrupting other communication traffic of mobile stations using the same frequency at periodic intervals. This allows mobile access bursts to be received at a base station without interfering with other traffic.
Claims17
A CDMA radio communication system comprising:
- a base station for transmitting CDMA signals within a cell;
- remote transmitting means for transmitting on uplink CDMA channels to said base station having means for interrupting data communication at a beginning of said access slots and means for selectively transmitting access bursts during said access state, wherein said uplink CDMA channels comprise access slots during which random access bursts can be transmitted to initiate communication with said base station.
A CDMA radio communication system comprising:
- a base station for transmitting CDMA signals within a cell;
- remote transmitting means for transmitting on uplink CDMA channels to said base station, wherein said uplink CDMA channels comprise access slots during which random access bursts can be transmitted to initiate communication with said base station;
- and
- wherein said access slots have a length based on a minimum power ramp up delay and a maximum propagation delay between the remote transmitting means and the base station.
A method for initiating communication between an idle remote station and a base station in a CDMA radio communication system, comprising the steps of:
- providing access slots at predetermined time intervals on a frequency during which regular CDMA communication traffic on the frequency is interrupted;
- and
- transmitting an access burst from the idle remote station to be received by the base station during one of the access slots.
Dependencies are inferred from the claim text.