Nokia Telecommunications Oy

Nokia Mobile Phones Limited

Nokia Corporation

Kari Jyrkka

Harri A Jokinen

Olli Piirainen

Jari Hamalainen

Pekka Mottonen

A method enables the introduction of a 200 kHz GSM-type network into a TDMA system having a bandwidth that is substantially less than a 2.5 MHz bandwidth normally employed for GSM-type networks. The method provides a 52-multiframe containing 12 blocks of four consecutive frames, two idle frames, and two control channels, and rotates the control channels belonging to a serving time group over odd timeslot numbers as 7, 5, 3, 1, 7, 5, . . . , etc. Preferably the rotation occurs between frame numbers (FN) mod 52=3 and 4. Information specifying at least the rotation direction is signalled to the mobile station in a downlink synchronization channel.

Enhancements to the 3-carrier compact solution for IS-136HS

A method is disclosed to distinguish a first type of control channel from a second type of control channel. The method includes steps of (a) transmitting a carrier of the first type of control channel so as to include a first symbol sequence that results, when demodulated, in a sine wave having a frequency with a first offset from the carrier; (b) transmitting a carrier of the second type of control channel so as to include a second symbol sequence that results, when demodulated, in a sine wave having a frequency with a second offset from the carrier; and (c) demodulating a received carrier and detecting whether the carrier includes the first type of control channel of the second type of control channel. In the preferred embodiment of this invention the first symbol sequence is an all zeroes sequence, and the second type of symbol sequence is an alternating ones and zeroes sequence, which results in the first offset being a positive offset, and the second offset being a negative offset. In a most preferred embodiment the first offset is &plus;67.7 kHz, and the second offset is &minus;67.7 kHz. The step of demodulating includes a step of multiplying an I/Q representation of the received symbol sequence by 1&minus;j, &minus;1 j, 1&minus;j, . . . , and by 1 j, &minus;1&minus;j, 1 j, . . .

Method and apparatus for distinguishing a compact control channel from a classic control channel

A method and a system for expanding the capacity for transmission of information in a data frame which comprises at least an information element and a control element. After the data frame is subjected to channel coding, a portion of the control element is either removed or replaced by a divided portion of the information to be transmitted in the data frame.

Method for enhancing data transmission

Method of detecting a call set-up burst, and a receiver

Method for determining connection quality in a receiver utilizing a

Method for frame quality detection and a receiver

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Oulu, Finland

Kari Jyrkka