Abstract: The present invention reduces power consumption and costs for components, and improves acknowledgement speed by using a memory or the like used only for acknowledgement. A time-division multiple access radio communication device of the present invention includes a receive-data buffer portion for storing received data; a unique word detecting portion for detecting a unique word from the received data; a timer portion for counting time from the point at which the unique word is detected at the unique word detecting portion; a cyclic redundancy check (CRC) calculating portion for checking errors in the received data; and a send-data buffer portion for storing data to be sent. The time-division multiple access radio communication device is further provided with an acknowledgement data generating portion.

Abstract: The history of handover destinations is stored in a handover history storage section. Each time handover is effected, the history of past five consecutive handover destinations including the present handover destination is determined on the basis of the handover history storage section. When any of the handover destinations has been stored in the handover history storage section, the mobile station recognizes its state to be in the steady state and otherwise to be in the moving state. On the basis of the result of the recognition, the mobile station selects a search algorithm suitable for each state and searches for a base station. This enables the best base station to be searched for according to the state of the mobile station, thereby reducing the power consumption in the wait state, which lengthens the battery service life.

Abstract: A first portable messaging unit (PMU) (122) sends (502) address information to a second PMU through a wireless messaging system, and the second PMU receives (504) the address information. In response, the second PMU makes a check (506) of whether information identical to the address information is stored in its address book (230) and then processes (508-516) the address information in a predetermined manner dependent upon the result of the check.

Abstract: A wireless communication system, such as a cellular communication system prioritizes calls to have a low, regular or high priority. The communication channels provided by a base station are divided into regular channels and reserved channels. All calls are connected on regular channels until the regular channels are all full. When the regular channels are all full, then regular priority calls are connected as low priority calls or not at all. If a regular priority call is connected as a low priority call it is connected via a reserved channel. Once all the reserved channels are full, then a high priority call is attempted to be connected by dropping a low priority call and using the reserved channel that the low priority call was using.

Abstract: The present invention relates to an integrated circuit comprising a series of conducting layers (1) . . . (6), separated in pairs by insulating layers, including a capacitive element CF formed by a stack of conducting layers cut out of the conducting layers. According to the invention, the capacitive element CF comprises as many conductive plates as the integrated circuit has conducting layers. The invention enables to maximize the reduction of the influence of each of its manufacturing steps on the real value of the capacitive element CF.