| 摘要 |
A first telecommunications system (201) has at least partially geographically overlapping coverage with a second telecommunications system (202), with radio transmission access in the first telecommunications system utilizing code division multiple access (CDMA) with a time division multiple access (TDMA) component. A base station (BS) of the first telecommunications system communicates over an air interface with a subscriber station (SS) and broadcasts a common broadcast physical channel (BPCH) on at least an active carrier/timeslot combination (C/TS). The common broadcast physical channel includes broadcast system identity information. The subscriber station uses the broadcast system identity information to distinguish between transmissions of the first telecommunications system and the second telecommunications system. Moreover, the subscriber station uses the broadcast system identity information for framing transmissions in the first telecommunications system. The base station of the first system broadcasts at least two common broadcast physical channels active on different timeslots. Preferably, a fixed direct sequence CDMA code is employed for the common broadcast physical channel. In accordance with an instant dynamic channel selection procedure of the present invention, the subscriber station selects a carrier/timeslot for sending an access request to the first system base station. The carrier/timeslot selected by the first system subscriber station for sending an access request to the first system base station is also used for a traffic channel. Preferably, the first system subscriber station selects a least interfered carrier/timeslot as the carrier/timeslot for sending an access request to the first system base station. In response to the access request, the first system base station sends an answer on a next down-link carrier/timeslot included in a duplex pair with the carrier/time slot which the first system subscriber station selected for sending the access request to the first system base station. At an given moment a connection between the first system base station and the subscriber station is borne on a physical channel of the first telecommunications system, the physical channel being defined by a code, timeslot, and frequency. |
