Nokia Mobile Phones Limited

Robert Stanley Saunders

Nguyen Quan Tat

A radio receiver in which the length of time that it takes to synchronize with a burst to be received is used as a measure of the quality of the channel over which the burst is transmitted.

Radio receivers and methods of operation

A radio handset and method of operation of same for communication on a selected channel of a radio telephone system in which information is transmitted in bursts, each burst having respective portions independently capable of indicating burst errors. The handset is operable to detect sliding collisions by comparing the distribution of errors over error indicating portions of a received burst.

A portable radio telephone ( ) communicates with base stations ( ) in a digital radio telephone system, such as DECT, employing TDMA transmission. The portable radio telephone is programmed with an algorithm which is operative to select a communication channel by storing a blind slot mask ( ) representative of the time slots in each frame which are excluded, either by virtue of being occupied by the base station or by the portable radio telephone itself. Hence, any channel attempted and failed in an occupied time slot is excluded and marked blind in the blind slot mask. Further, the algorithm is operative to check the time slots for availability in a predetermined sequence which corresponds to the temporal sequence of the slots (or the reverse thereof) to promote orderly filling of the time slots at the base stations.

Methods and apparatus for excluding communication channels in a radio telephone

A portable radio telephone (,) communicates with base stations (,) in a digital radio telephone system, such as DECT, employing TDMA transmission. The portable radio telephone is programmed with an algorithm which is operative to select a communication channel by storing a blind slot mask (,) representative of the time slots in each frame which are excluded. The algorithm is operative to check the time slots for availability in a predetermined sequence which corresponds to the temporal sequence of the slots (or the reverse thereof) to promote orderly filling of the time slots at the base stations.

Portable radio telephone and methods of operation

A radio receiver in which the length of time that it takes to synchronise with a burst to be received is used as a measure of the quality of the channel over which the burst is transmitted.

A radio handset for communication via one of a plurality of channels with one of a plurality of base stations in a digital cellular telephone system, comprising means to monitor at first intervals signal activity in the channels and means to identify at second intervals from the signal activity in the channels a base station as a preferred candidate for intercell handoff.

Handoff by monitoring of received signal strengths among base stations

A portable radio telephone (5) communicates with base stations (1, 2) in a digital radio telephone system, such as DECT, employing TDMA transmission. The portable radio telephone is programmed with an algorithm which is operative to select a communication channel by storing a blind slot mask (7) representative of the time slots in each frame which are excluded. The algorithm is operative to check the time slots for availability in a predetermined sequence which corresponds to the temporal sequence of the slots (or the reverse thereof) to promote orderly filling of the time slots at the base stations.

Portable radio telephones and methods of operation

A wireless base station operating in a system in which wireless base stations are used to provide a link between a remote fixed part and a handset and method of operation of the same. The wireless base station prevents unnecessary handover initiation by the handset in the event that the link between the wireless base station and remote fixed part is poor.

Wireless base station

A portable radio telephone (5) communicates with base stations (1, 2) in a digital radio telephone system, such as DECT, employing TDMA transmission. The portable radio telephone is programmed with an algorithm which is operative to select a communication channel by storing a blind slot mask (7) representative of the time slots in each frame which are excluded, either by virtue of being occupied by the base station or by the portable radio telephone itself. Hence, any channel attempted and failed in an occupied time slot is excluded and marked blind in the blind slot mask. Further, the algorithm is operative to check the time slots for availability in a predetermined sequence which corresponds to the temporal sequence of the slots (or the reverse thereof) to promote orderly filling of the time slots at the base stations.

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London, United Kingdom

Robert Stanley Saunders