In cellular mobile, the geographical area covered by the smaller of: a base station, or a subsystem (sector antenna) of that base station corresponding to a specific logical identification on the radio path. Note: Mobile stations in a cell may be reached by the corresponding radio equipment of the base station. 2. The service area of an individual transmitter location in a cellular system. 3. In communications, a string that contains a header and user information. Note 1: A cell is dedicated to one user for one session. Cells for a given system are usually of fixed length and smaller than a frame, such as 424 bits for a cell, compared to 1024 for a frame. Note 2: In asynchronous transfer mode (ATM) systems, a cell consists of 53 bytes, i.e., a 5-byte header field and a 48-byte information field. Note 3: A cell does not have error-correction capability and is therefore suited for low-BER communications systems, such as digital fiber optic systems. 4. In OSI, a fixed-length block labeled at the Physical Layer of the Open Systems Interconnection--Reference Model (OSI--RM. ) 5. In computer systems, an addressable, internal hardware location. 5. In computer applications, a single location on a spreadsheet.