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CDMA radiotelephone having optimized slotted mode and long code operation
| Details |
Inventors: Gould, Adam F.; Robertson, James R.; Noneman, John W.; Gelm, John R.;
Assignee: Nokia Mobile Phones Ltd. (FI)
Primary Examiner: Kizou; Hassan
Assistant Examiner: Yao; Kwang
Attorney, Agent or Firm: Perman & Green
A radiotelephone (10) capable of operation within a CDMA radiotelephone system. The radiotelephone includes a receiver (30) for receiving a paging channel transmission; a system time pseudonoise (PN) generator (18); and despreading circuitry (20, 22, 24 26, 28), having an input coupled to the receiver, for despreading the paging channel transmission received during at least a portion of the assigned slot. The assigned slot is predetermined to have a duration that is three times the duration of a rollover period of the system time pseudonoise (PN) generator (26.667 msec) and four times the duration of one frame (20 msec), or 80 msec. The use of predetermined masks for initializing the PN generators, and in particular a Long Code PN generator (32), is also described. |
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DETAILED DESCRIPTION A first object of this invention is provide a method for reducing the duty cycle of a CDMA radiotelephone when operating in a slotted paging mode.
A further object of this invention is to provide a discontinuous reception mode of operation in a radiotelephone, wherein a duration of a transmission that must be periodically received is made an integer multiple of a system time constant and also an integer multiple of a smallest partition of a transmission period.
A still further object of this invention is to provide a slotted paging mode (discontinuous reception) mode of operation of a CDMA radiotelephone, wherein a paging channel slot duration is optimized by being made an integer multiple of a system time pseudonoise (PN) sequence rollover period, and is also made an integer multiple of a paging channel frame period.
Another object of this invention is to provide an efficient method to initialize a Long Code PN generator to a correct state.
The foregoing and other problems are overcome and the objects of the invention are realized by a Code Division Multiple Access (CDMA) radiotelephone system that is constructed an operated in accordance with the invention.
The system includes at least one base station for transmitting a paging channel having a plurality of repeating paging channel slots each of which is comprised four frames.
The system further includes a radiotelephone capable of operation within the CDMA radiotelephone system, the radiotelephone comprising a receiver for receiving the paging channel transmission; a system time pseudonoise (PN) generator; and despreading circuitry, having an input coupled to the receiver, for despreading the paging channel transmission received during at least a portion of the assigned slot.
The assigned slot is predetermined to have a duration that is three times the duration of a rollover period of the system time pseudonoise (PN) generator (26.
667 msec) and four times the duration of one frame (20 msec), or 80 msec.
Also disclosed is a method for use in a CDMA radiotelephone for initializing a Long Code PN generator
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