| 摘要 |
In some TDD communications systems such as DECT it has been proposed that in an idle period a primary (or base) station transmits some basic system and timing information as a normal idle beacon message once every frame and that paging messages to secondary stations (or portables) be sent once every 16 frames. In relatively long idle periods, for example at night, these frequent normal idle beacon messages are not required and represent a source of undesirable interference and a waste of power. In order to reduce this undesirable interference it is proposed that the primary station, subject to certain conditions being determined by the primary station, invites in-range secondary stations to participate in a low duty cycle link mode in which the primary station transmits paging messages as required and low duty link reassurance messages at relatively long intervals. In this mode the secondary stations are controlled to wake up at the required intervals. However, if the surrounding interference increases, the system reverts to the normal idle state. |
