EP0634851A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process and device for the equalization of the transmission time of a plurality of radio base stations
Assignee: Italtel SpA
•
Filing: 1994-06-29
•
Granted: —
•
Expires: 2014-06-29
Abstract
Abstract Process and device for the equalization the transmission time To of m radio base stations (RFP) linked through one or more PCM lines to a master unit (MUI). The process consists of measuring the delay (RRS) by which the slave stations receive a reference signal (Tm) emitted by the master unit, and storing in each slave station (RFP) a representative information of the complement of said delay (RRS) with respect to the above-said transmission time To. The device comprises a counter (CK), qualified for the calculation of said reference signal (Tm), set up by the synchronism signal allocated in the time slot zero of the PCM frame, and blocked by a signal (r) available at the output of a recognition unit of the time slot zero of the PCM frame emitted by the interlocutor station.
Inventors
- 👤 Paolo Lazzari
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 23:41
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0635; H04J3/0682
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
Process for the equalization of the transmission time To of radio base stations (RFP) linked through one or more PCM lines to a master unit (MUI) in a communication network of the cordless type in which the time synchronization between the stations is required, characterized in that it includes the following steps: a) measuring the time (T) elapsed between the transmission of a reference signal Tm from said master station (MUI) to at least one slave station (RFPi) along said PCM line and the reception in said master station (MUI) of the signal retransmitted from the slave station (RFPi); b) deducting from said time (T) the delay (K) introduced by the slave station to retransmit said reference signal (Tm) and divide by 2 the result of the subtraction in order to obtain the delay (RRS) by which the slave station receives the reference or synchronism signal (Tm); c) storing in the slave station (RFP) a representative information of the complement of said delay (RRS) by which the slave station receives the reference signal compared to the above-said transmission time To.
Claim 2
Dependent Claim
30 words
Process as claimed in Claim 1, characterized in that said reference signal Tm is set up by the synchronism signal allocated in the zero time slot of the PCM frame.
Claim 3
Dependent Claim
154 words
Process as claimed in Claims 1 and 2 in which the slave stations (RFP) are linked to a dorsal set up by a PCM link, characterized in that it comprises the following steps: a) the master station (MUI) activates the frame PCM TX; b) the master station (MUI) asks the slave stations (RFP) for the calculation of the delay (RRS) by which a generic station receives the reference signal emitted by the adjacent station; c) the master station calculates the delay as mentioned at step b) with respect to the first slave station (RFP); d) the slave stations (RFP) transmit the result of the calculation (RRS) as at step b) to the master station (MUI); e) The master station (MUI) calculates said representative informations (RET) of the complement of the results (RRS) as at step d) compared to the time To and transmits the relative complement (RET) to the slave stations (RFP). (Figure 4).
Claim 4
Dependent Claim
153 words
Process as claimed in claims 1 and 2 wherein the slave stations are linked to a "dorsal" set up by a PCM link, characterized in that it comprises the following phases: a) the master station (MUI) emits the PCM frame and communicates: i) the slave station interested by the measurement the retransmission of the PCM frame; ii) the slave stations not interested by the measurement to disconnect from the dorsal, and carries out the calculation of the delay (RRS) by which the slave station at issue receives the reference signal; b) repeats the operation as at step a) for all slave stations; c) the master station the master station (MUI) calculates said representative informations of the complement of the delay calculation (RRS) by which the slave stations receive the reference signal compared to the above-said time of transmission To and transmits the result (RET) of this calculation to the slave stations (figure 5).
Claim 5
Dependent Claim
146 words
Process as claimed in Claims 1 and 2 wherein the slave stations are "star like" linked to a master station, characterized in that it comprises the following steps: a) the master station (MUI) transmits the PCM frame to a slave station, communicates to the slave stations not interested by the measurement to disconnect from it and carries out the calculation of the delay (RRS) by which the slave station interested by the measurement receives the reference signal; b) the step as at point a) is selectively repeated for all slave stations (RFP) linked to the master station (MUI); c) the master station (MUI) calculates said representative informations of the complement of the delay calculation (RRS) by which the slave stations receive the reference signal with respect to the above-said transmission time To and transmits the result (RET) of this calculation to the slave stations (figure 6).
Claim 6
Dependent Claim
162 words
Device for the equalization of the transmission time To of radio base stations (RFP) linked through one or more PCM links to a master unit (MUI) in a communication network of the cordless type in which the time synchronization is required between the stations, characterized in that each station includes: - a transmitting section suitable to emit a PCM frame in the time defined by the synchronism signal (Tm) allocated in the zero time slot of the frame itself; - a receiving section including a counter (CK) qualified for the calculation by said synchronism signal (Tm) and blocked by a signal available at the output of a unit (RST) for the detection of the synchronism signal (Tm) always allocated in the zero time slot of a PCM frame emitted by the transmitting section of an interlocutor station; - means suitable to order the recirculation (RIC) of the PCM frame received on the receiving section at the output of the proper transmitting section.
Claim 7
Dependent Claim
28 words
Device as claimed in Claim 6, characterized in that said counter (CK) receives at the counting input a signal which frequency is in the order of 40 MHz.
Claim 8
Dependent Claim
40 words
Device as claimed in Claim 6, characterized in that said unit (RST) of recognition of the synchronism signal (Tm) is linked upstream of the elastic memory (ME) normally foreseen for the compensation of the delay introduced by the PCM section.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.