Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
179 words
A digital radio communication system (1), comprising at least one primary station (BS1) and at least one secondary station (MS1), which stations exchange digital data in at least one time slot (ts) of a time multiplex frame (fr) via at least one frequency channel, the primary station (BS1) and/or the secondary station (MS1) comprising control means (PCC, PM, DM) which are capable of replacing a first time-slot/frequency-channel combination (fr, st1) allocated to data exchange by a second time-slot/frequency-channel combination (fr, st4), characterized in that the system (1) is adapted to exchange, during replacement of the first time- slot/frequency-channel combination (fr, st1) by the second time-slot/frequency-channel combination (fr, st4), also a copy of the data in the second time-slot/frequency- channel combination (fr, st2) during at least one time multiplex frame (fr) in order to store, after verification of the validity of the copy data, the data and the copy data in a cyclic buffer (SB5) so that a phase shift (d) between the data and the copy data is eliminated, and to release subsequently the first time-slot/frequency-channel combination (fr, st1).
Claim 2
Dependent Claim
101 words
A digital radio communication system as claimed in Claim 1, characterized in that the digital data represents compressed digital speech, the system (1) comprising a first pointer (RFP) which controls the filling/reading of the cyclic buffer (SB5) with compressed speech data, and a second pointer (SPP) which controls the reading/filling of the cyclic buffer (SB5) at a substantially lower speed, during filling/reading of the cyclic buffer (SB5) with compressed speech data and compressed copy speech data the first pointer (RFP) always being positioned on the cyclic buffer (SB5) so that the cyclic buffer (SB5) is filled/read with the most recent speech.
Claim 3
Dependent Claim
30 words
A digital radio communication system as claimed in Claim 2, characterized in that the second pointer (SPP) progresses freely along the cyclic buffer (SB5) in order to read/fill the buffer.
Claim 4
Dependent Claim
63 words
A digital radio communication system as claimed in Claim 1, 2 or 3, characterized in that the primary station (BS1) comprises delay time determining means (PCC, PM) for determining a propagation time between transmission by a primary station (BS1) and returned reception by the primary station (BS1), the secondary station (MS1) correcting the phase shift (d) by way of the propagation time determined.
Claim 5
Dependent Claim
88 words
A digital radio communication system as claimed in any one of the preceding Claims, characterized in that the secondary station (MS1) comprises signal strength measuring means (107) for measuring the signal strength of a radio signal modulated with the digital data, the control means (PCC, PM, DM) in the secondary station (MS1) replacing, on the basis of a signal strength of the radio signal measured by the signal strength measuring means (107), a time-slot/frequency-channel combination (fr, st1) allocated during data exchange by a different time-slot/frequency-channel combination (fr, ts4).
Claim 6
Dependent Claim
37 words
A digital radio communication system as claimed in any one of the preceding Claims, characterized in that the system exchanges the digital data in a duplex mode via time slot pairs in a time multiplex frame (fr).
Claim 7
Dependent Claim
42 words
A digital radio communication system as claimed in any one of the preceding Claims, characterized in that the system is a cordless telephony system in which the primary station is a base station and the secondary system is a cordless telephone set.
Claim 8
Dependent Claim
188 words
A primary or secondary station for use in a digital radio communication system as claimed in any one of the Claims 1 to 5, comprising transmission/receiving means (10) for transmission/reception, respectively, of a radio signal modulated with digital data, (de)modulation means (101, 102, PCC, PM, DM) which operate on the basis of time multiplex for (de)modulation of the digital data, and control means (PCC, PM, DM) which are capable of replacing a first time-slot/frequency-channel combination (fr, st1) allocated to data exchange by a second time-slot/frequency-channel combination (fr, st4), characterized in that the control means (PCC, PM, DM) are adapted to exchange, during replacement of the first time-slot/frequency-channel combination (fr, st1) by the second time-slot/frequency- channel combination (fr, st4), also a copy of the data in the second time-slot/frequency-channel combination (fr, st2) during at least one time multiplex frame (fr) in order to store, after verification of the validity of the copy data, the data and the copy data in a cyclic buffer (SB5) so that a phase shift (d) between the data and the copy data is eliminated, and to release subsequently the first time-slot/frequency-channel combination (fr, st1).