Compatible licensed and unlicensed band portable handset...

H - Electricity – 04 – J

Patent

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Details

H04J 4/00 (2006.01) H04Q 7/22 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2206473

In a TDM/TDMA portable radio communications system (5), a portable handset (201) is compatible for operation in FDD mode and TDD mode. In the FDD mode, different frequencies are used to separate a downlink transmission to a portable (201) from a port (204) from an uplink transmission from a port (204) to a portable (201). In the TDD mode, uplink and downlink transmissions are separated in different time-slots, but at the same frequency. The handset (201) includes common transmit and receive circuitry (300) that operates at fixed IF frequencies separated by the fixed FDD frequency difference between corresponding uplink and downlink signals. In the FDD mode, afrequency synthesizer (301), which is used to tune to transmit and receive at different frequencies from different ports, is not switched in frequency between transmitting and receiving a burst to and from a single port. In the TDD mode, the synthesizer (301) is switched in frequency between transmitting uplink and receiving downlink even though uplink and downlink signals are at the same frequency.

Dans un système TDM/TDMA portable de radiocommunications (5) un combiné portable est compatible avec le mode FDD (duplexage par division de fréquence) et le mode TDD (duplexage par division temporelle). En mode FDD, on utilise des fréquences différentes pour séparer une transmission descendante vers un combiné (201) portable provenant du port (204) d'une transmission montante allant du port (204) vers le combiné portable (201). En mode TDD, les transmissions montantes et descendantes sont réparties dans des créneaux de temps séparés, mais ont la même fréquence. Le combiné (201) comporte des circuits communs (300) d'émission et de réception fonctionnant sur des fréquences intermédiaires fixes séparées par la différence fixe entre les fréquences FDD des signaux montants et descendants. En mode FDD, le synthétiseur de fréquence (301) servant à l'accord en vue de l'émission et de la réception sur différentes fréquences depuis différents ports n'est pas commuté en fréquence entre l'émission et la réception d'un paquet à destination d'un port. En mode TDD, le synthétiseur (301) est commuté en fréquence entre la liaison montante d'émission et la liaison descendante de réception bien que les signaux montants et descendants soient à la même fréquence.

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