1. A method for feeding back a Channel Quality Indicator (CQI) from a Mobile Station (MS) in a mobile communication system, comprising:
determining a number of frequency bands for which the MS feeds back CQIs based on a preset feedback efficiency factor;
selecting the determined number of frequency bands in a descending order of channel quality; and
feeding back the CQIs of the selected frequency bands to a Base Station (BS).
2. The method of claim 1, wherein the determining of the number of frequency bands comprises computing the number of frequency bands by
f
k
=
n
\ue89e
\ue89e
int
\ue8a0
(
s
_
k
\ue8a0
(
t
)
e
)
where n int(\u2022) represents a nearest integer function, sk(t) denotes an average number of frequency bands allocated to MS k, and e denotes the feedback efficiency factor, ranging between 0 and 1.
3. The method of claim 2, wherein sk(t) is determined by using an exponential weighted moving average scheme by
s
_
k
\ue8a0
(
t
+
1
)
=
(
1
–
1
t
e
)
\xd7
s
_
k
\ue8a0
(
t
)
+
(
1
t
e
)
\xd7
s
k
\ue8a0
(
t
)
where te denotes a window length used for computing the average number of frequency bands allocated to MS k and sk(t) denotes the current number of frequency bands allocated to MS k.
4. The method of claim 3, wherein the current number of frequency bands allocated to MS k is determined from a control message received from the BS.
5. The method of claim 1, wherein the determining of the number of frequency bands comprises, if the number of frequency bands for which the MS feeds back CQIs is larger than a total number of frequency bands allocated by the BS, determining the number of frequency bands for which the MS feeds back CQIs to be the total number of frequency bands allocated by the BS.
6. The method of claim 1, wherein the determining of the number of frequency bands comprises, if the number of frequency bands for which the MS feeds back CQIs is 0, feeding back a CQI of a frequency band comprising a best channel quality.
7. The method of claim 1, wherein the channel quality is based on at lest a Signal-to-Noise Ratio (SNR).
8. The method of claim 1, wherein the feedback efficiency factor is a ratio of the number of frequency bands for which the MS feeds back CQIs to an average number of frequency bands allocated to the MS for a preset time period.
9. The method of claim 1, wherein each frequency band comprises at least one subcarrier.
10. A method for feeding back a Channel Quality Indicator (CQI) from a plurality of Mobile Stations (MSs) in a mobile communication system, comprising:
determining, for each of the plurality of MSs, a number of frequency bands for which the each MS feeds back CQIs, wherein the respective number of frequency bands for which the each MS feeds back CQ is determined such that a substantially constant ratio is maintained of a sum of the number of frequency bands of all of the plurality of MSs for which CQIs are to be fed back to a total number of frequency bands allocated to all of the plurality of MSs;
selecting, by each of the plurality of MSs, the determined number of frequency bands; and
feeding back the CQIs of the selected frequency bands to a Base Station (BS).
11. The method of claim 10, wherein the determining, for each of the plurality of MSs, of the number of frequency bands comprises computing the number of frequency bands by
f
k
=
n
\ue89e
\ue89e
int
\ue8a0
(
s
_
k
\ue8a0
(
t
)
e
)
where n int(\u2022) represents a nearest integer function, sk(t) denotes an average number of subchannels allocated to MS k, and e denotes the feedback efficiency factor, ranging between 0 and 1.
12. The method of claim 11, wherein sk(t) is determined by using an exponential weighted moving average scheme by
s
_
k
\ue8a0
(
t
+
1
)
=
(
1
–
1
t
e
)
\xd7
s
_
k
\ue8a0
(
t
)
+
(
1
t
e
)
\xd7
s
k
\ue8a0
(
t
)
where te denotes a window length used for computing the average number of frequency bands allocated to MS k and sk(t) denotes the current number of frequency bands allocated to MS k.
13. The method of claim 12, wherein the current number of frequency bands allocated to MS k is determined from a control message received from the BS.
14. The method of claim 10, wherein the determining, for each of the plurality of MSs, of the number of frequency bands comprises, if the number of frequency bands for which the respective MS feeds back CQIs is larger than a total number of frequency bands allocated by the BS, determining the number of frequency bands for which the respective MS feeds back CQIs to be the total number of frequency bands allocated by the BS.
15. The method of claim 10, wherein the determining, for each of the plurality of MSs, of the number of frequency bands comprises, if the number of frequency bands for which the respective MS feeds back CQIs is 0, feeding back a CQI of a frequency band comprising a best channel quality.
16. The method of claim 10, wherein the channel quality is based on at lest a Signal-to-Noise Ratio (SNR).
17. The method of claim 10, wherein the feedback efficiency factor is a ratio of the number of frequency bands for which a respective MS feeds back CQIs to an average number of frequency bands allocated to respective MS for a preset time period.
18. The method of claim 10, wherein each frequency band comprises at least one subcarrier.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An electrostimulator comprising electrode connections which are to be connected at least at times to a stimulation unit and to a detection unit of the electrostimulator, wherein the stimulation unit is adapted to generate electrostimulation pulses for the stimulation of body tissue and to deliver the electrostimulation pulses to at least one of the electrode connections, and wherein the detection unit is adapted to detect successful stimulation of body tissue on the basis of an electrical signal occurring at at least one of the electrode connections, and wherein the electrostimulator is adapted to record an electrical signal representative of an intracardial electrocardiogram by way of said at least one electrode connection,
and wherein arranged between the at least one electrode connection and the detection unit is a high pass filter with a lower limit frequency of greater than 100 Hz, and wherein the detection unit is adapted to evaluate the high pass-filtered electrical signal.
2. The electrostimulator as set forth in claim 1 wherein the electrostimulator is adapted to record the electrical signal representative of an intracardial electrocardiogram by way of a bipolar electrode configuration.
3. The electrostimulator as set forth in claim 2 wherein connected o the electrode connection for recording the electrical signal representative of an intracardial electrocardiogram is an at least bipolar electrode line which has at least two electrodes for recording electrical potentials at the electrodes, wherein the electrodes have a low degree of polarization.
4. The electrostimulator as set forth in claim 3 wherein the electrodes include a fractal coating.
5. The electrostimulator as set forth in claim 4 wherein the electrostimulator includes an autoshort device for short-circuiting stimulation electrodes, which is adapted to short-circuit the electrodes for not longer than 5 milliseconds.
6. The electrostimulator as set forth in claim 5 wherein the detection unit is adapted to detect successful stimulation (capture) and to produce a capture signal.
7. The electrostimulator as set forth in claim 6 wherein the detection unit is adapted to detect successful stimulation on the basis of a short-term peak in the electrical signal representative of an intracardial electrocardiogram.
8. The electrostimulator as set forth in claim 7 wherein the detection unit is adapted to detect a short-term peak in the electrical signal representative of an intracardial electrocardiogram within a defined time window which is started with the delivery of a stimulation pulse.
9. The electrostimulator as set forth in claim 8 further comprising a stimulation control unit which is so connected to the stimulation unit and the detection unit and adapted such that the stimulation control unit ascertains from the spacing in respect of time between a stimulation pulse and a capture signal a stimulation pulse strength signal which determines the strength of a following stimulation pulse produced by the stimulation unit.
10. The electrostimulator as set forth in claim 9 wherein the stimulation control unit is adapted to compare the spacing in respect of time between the delivery of a stimulation pulse and the following capture signal to a reference time value and to set the stimulation pulse strength signal in such a way that the strength of a stimulation pulse decreases with a shorter spacing in respect of time between the delivery of a stimulation pulse and the following capture signal as long as the spacing in respect of time does not fall below the reference time value.
11. The electrostimulator as set forth in claim 10 wherein the reference time value is set in such a way that the reference time value corresponds to a sufficiently supra-threshold stimulation.
12. The electrostimulator as set forth in claim 9 wherein the stimulation control unit is adapted in the event of absence of a capture signal within a predetermined time window after delivery of a stimulation pulse to trigger a backup stimulation pulse of greater strength.
13. The electrostimulator as set forth in claim 12 further comprising a telemetry unit which is connected to the detection unit and adapted to send a time spacing signal corresponding to the spacing in respect of time between a stimulation pulse and a capture signal to an external unit.
14. The electrostimulator as set forth in claim 13 further comprising a memory for storing one or more values of the time spacing signal, which is connected to the detection unit and the telemetry unit.
15. The electrostimulator as set forth in claim 6 further comprising a stimulation control unit which is so connected to the stimulation unit and the detection unit and adapted such that the stimulation control unit ascertains from the spacing in respect of time between a stimulation pulse and a capture signal a stimulation pulse strength signal which determines the strength of a following stimulation pulse produced by the stimulation unit.
16. The electrostimulator as set forth in claim 6 further comprising a telemetry unit which is connected to the detection unit and adapted to send a time spacing signal corresponding to the spacing in respect of time between a stimulation pulse and a capture signal to an external unit.
17. The electrostimulator as set forth in claim 1 wherein the detection unit is adapted to detect successful stimulation (capture) and to produce a capture signal.
18. An electrostimulator comprising electrode connections which are to be connected at least at times to a stimulation unit and to a detection unit of the electrostimulator, wherein the stimulation unit is adapted to generate electrostimulation pulses for the stimulation of body tissue and to deliver the electrostimulation pulses to at least one of the electrode connections, and wherein the detection unit is adapted to detect successful stimulation of body tissue on the basis of an electrical signal occurring at at least one of the electrode connections, and wherein the electrostimulator is adapted to record an electrical signal representative of an intracardial electrocardiogram by way of said at least one electrode connection,
and wherein arranged between the at least one electrode connection and the detection unit is a high pass filter with a lower limit frequency of greater than 100 Hz, and wherein the detection unit is adapted to evaluate the high pass-filtered electrical signal,
and wherein the electrostimulator includes an autoshort device for short-circuiting stimulation electrodes, which is adapted to short-circuit the electrodes for not longer than 5 milliseconds.