초록 ▼

In an exemplary embodiment, a test pattern is sent by a base station at a suitable point in a communications protocol. According to the evaluation of the test pattern transmission, a relatively high data rate or a lower more conservative data rate is selected for the transmission of a relatively len

In an exemplary embodiment, a test pattern is sent by a base station at a suitable point in a communications protocol. According to the evaluation of the test pattern transmission, a relatively high data rate or a lower more conservative data rate is selected for the transmission of a relatively lengthy data message. In the most general case, the test pattern can comprise a query from a mobile unit having a message to send, and such test pattern can be transmitted at the lower data rate where its transmission characteristics (e.g. signal strength, jitter or quality of transmission of known information) can be used to predict probable feasibility of transmission at the higher data rate.

대표청구항 ▼

In a radio frequency data communication system, base station transceiver means selectively operable for data communication at a lower relatively conservative first data rate where reliable transmission is obtained under a relatively wide range of operating conditions, and at a relatively less conser

In a radio frequency data communication system, base station transceiver means selectively operable for data communication at a lower relatively conservative first data rate where reliable transmission is obtained under a relatively wide range of operating conditions, and at a relatively less conservative second data rate which is substantially higher than said first data rate and provides reliable data communication under a more restricted range of operating conditions, a plurality of mobile transceiver units in radio communication with said base station transceiver means and selectively operable for data communication at said first data rate and at said second data rate, control means at the mobile transceiver units evaluating a test transmission after transmission from the base station transceiver means to said plurality of mobile transceiver units, and operable to evaluate said test transmission as received to determine whether the respective mobile transceiver units should be attempted at said relatively less conservative second data rate, and selecting according to such evaluation said second data rate or said lower relatively conservative first data rate, and data rate switchover means at the mobile transceiver units controlled by said control means for automatically effecting data communication at the first and second data rates according to the evaluation by said control means of the received test transmission.