RU94021697A

RU94021697A - CABLELESS LOCAL COMMUNICATION

Info

Publication number: RU94021697A
Application number: RU94021697/09A
Authority: RU
Inventors: Бад Эндрю; Фурно Рино
Original assignee: Сикстел С.п.А.
Priority date: 1991-10-07
Filing date: 1992-09-28
Publication date: 1997-12-20

Claims

1. A cordless local area network (LAN) for radio data exchange between a plurality of user stations (T), each of which contains a corresponding data input terminal (PC), through a fixed central control device (C), in accordance with a predefined communication standard (DECT) characterized in that each data input terminal (PC) is connected to a separate and special mobile radio transceiver module (MRM) and to an interface adapter device (LM) integrated in the data input terminal (PC) and connected between a data input terminal (PC) and a mobile radio module (MRM) with a flexible multicore cable (CC), and the central control device (C) contains a plurality of radio bases (RV) installed in the corresponding predetermined fixed places for cableless duplex data exchange with mobile radio modules (MRM) ) and connected by connecting lines (L) to a microprocessor concentrator (MC) installed in a fixed place and programmed to control communication between user stations (T) by means of rad a lease (RB) in accordance with the name of a communication standard in which each data input terminal (PC) contains a data bus (DB), the adapter device (LM) associated with each data input terminal (PC) contains: means (51-58 ) to activate and deactivate the radio connection, the buffer memory (55) and the main microprocessor (50), which is connected to the data bus (DB) of the data input terminal (PC), to the buffer memory (55) and to the means (51-58) for activating and deactivating the radio connection, the main microprocessor (50) being used: to control communication with the data input terminal (PC) in a predetermined manner, for passing to the buffer memory (55) the data to be transmitted by the associated mobile radio module (MRM), and for controlling the means of activating and deactivating (51-58) and activating the radio connection each times when the data is stored in the memory (55), and keeping the radio connection open for a predetermined period of time after completion of the data transfer to the memory (55).

2. The local area network according to claim 1, characterized in that the main microprocessor (50) is configured to control the means of activation and deactivation (51, 57, 58) in such a way that after the data transfer to the memory (55) is completed, the radio line remains open in the course of the time period, which is determined adaptively based on statistics of the communication schedule related to the data input terminal (PC) and is calculated for a predetermined period of time.

3. The local area network according to any one of paragraphs. 1-2, characterized in that in accordance with the DEST standard, the radio communication between mobile radio modules (MRM) and fixed radio bases (RB) is in agreement with a mixed system of time and frequency multiplexing (TDM, FDM) on n channels or frequencies (f ₁ - f ₁₀₎ in a predetermined band with time cycles (frames) a predetermined duration separated by a predetermined number (2m) of time slots, wherein the main microprocessor (50) the adapter (LM) of each user station (T) Using n for cyclically scanning all 2 m • n segments of all n channels (f ₁ -f ₁₀₎ via the associated mobile radio module (MRM) and to detect the level of the signal emitted by each fixed radio base (RB) in each slot for each channel or frequency and thus, to determine which radio base (RB) is closest to the user station (T), the main processor (50) is also used during scanning to decode signals indicating the radio base (RB), which is active, in each segment and to select in order to pass s data - the nearest radio bases (RB), for which not all segments occupied.

4. The local area network according to claim 3, characterized in that the hub device (MS) comprises a plurality of group signal processors (BBB), each of which is connected and connected to a corresponding fixed radio base (RB), and group signal processors (BBB) are used for cyclic scanning communication channels or frequencies (f ₁ -f ₁₀₎ according to a predetermined sequence through associated radio bases (RB), and wherein the main processor (50) adapters (LM) of the user stations (T) used for scanning ka als or transmission frequencies (f ₁ -f ₁₀₎ in synchronism with the baseband processors (BBP) but one channel in advance.

5. The local area network according to any one of paragraphs. 1-4, characterized in that the main processors (50) of the adapters (LM) of the user stations (T) and the group signal processors (WWR) of the concentrator (MS) are used to carry out the DEST procedures of asymmetric connections and connections with many unidirectional transmission channels for determining segments in which you need to transmit.

6. The local area network according to any one of paragraphs. 1-6, characterized in that each radio module (MRM) has a pair of antennas (A1, A2) to obtain spatial "diversity".

7. The local area network according to claim 6, characterized in that each fixed radio base (RB) has one antenna (A).