초록 ▼

In a mobile communication system (T1) a time interval selection means (TISM) in a network control means (RNC) determines a time interval and sends an indication about this time interval to a subscriber station (MS) in a time interval indication signal. A time interval signal determining means (TISDM

In a mobile communication system (T1) a time interval selection means (TISM) in a network control means (RNC) determines a time interval and sends an indication about this time interval to a subscriber station (MS) in a time interval indication signal. A time interval signal determining means (TISDM) in the subscriber station (MS) detects the time interval and an IF measurement means (IFMM) carries out inter-frequency/inter-system measurements in the detected time interval specified by the network control means (RNC). In this time interval the temporary reduction of the quality of service QoS on the communication connection (CC) is planed by the network control means (RNC). However, independent as to whether a delay-sensitive or loss-sensitive data transmission is carried out, the network control means (RNC) can make provisions in order to compensate the temporary reduction of the quality of service. Such procedure is superior to performing IF measurements in an idle time interval of a compressed time slot in which a temporary degradation of the quality of service must always be accepted due to a compressed mode of operation.

대표청구항 ▼

What is claimed is: 1. A subscriber station of a mobile communication system having at least one base transceiver station and a network control means, including an inter-frequency measurement means adapted to perform IF measurements, comprising: a time interval signal detection means adapted to det

What is claimed is: 1. A subscriber station of a mobile communication system having at least one base transceiver station and a network control means, including an inter-frequency measurement means adapted to perform IF measurements, comprising: a time interval signal detection means adapted to detect in a transmission from said network control means an IF measurement time interval indication signal indicating a time interval of an established connection between said subscriber station and said base transceiver station in which IF measurements are to be carried out by said subscriber station, wherein said IF measurement means is adapted to perform said IF measurements in said time interval indicated in said IF measurement time interval indication signal. 2. A subscriber station according to claim 1, wherein said IF measurement means is adapted to carry out said IF measurements over the entire time interval indicated by the IF measurement time interval indication signal. 3. A subscriber station according to claim 1, wherein said IF measurement means is adapted to start performing said IF measurements in said time interval in response to an IF measurement trigger signal. 4. A subscriber station according to claim 3, wherein said IF measurement time interval indication signal is contained in said IF measurement trigger signal. 5. A subscriber station according to claim 3, wherein said IF measurement trigger signal is generated by an IF handover means when said IF handover means determines that transmission conditions in said mobile communication system necessitate an IF handover of said subscriber station. 6. A subscriber station according to claim 3, wherein IF handover means is located in a network control means of said mobile communication system and is adapted to transmit said IF measurement trigger signal to said subscriber station via a base transceiver station in response to determining a network-evaluated handover. 7. A subscriber station according to claim 3, wherein IF handover means is located in said subscriber station and is adapted to output said IF measurement trigger signal in response to determining a mobile-evaluated handover. 8. A subscriber station according to claim 1, wherein said subscriber station comprises a connection quality monitoring means adapted to monitor the quality of service on the established communication connection and to transmit information of the quality of service to said network control means. 9. A subscriber station according to claim 1, wherein during said connection a delay-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein said subscriber station comprises a deletion means for deleting the data arriving from said base transceiver station during said time interval and a power adjustment means to increase a transmission power on the up-link on the communication connection before the beginning of said time interval and/or after the end of said time interval. 10. A subscriber station according to claim 1, wherein during said connection a loss-sensitive and/or delay-sensitive data transmission is performed between said base transceiver station and said subscriber station. 11. A subscriber station according to claim 1, wherein a data transmission between said subscriber station and said base transceiver station is carried out via a transmission of data frames including a data portion and a control portion, wherein said data transmission between said subscriber station and said base transceiver station is carried out in a compressed mode by compression of transmission data in said data portion in at least one time slot such that an idle time interval is provided in said time slot where no data transmission occurs, wherein said subscriber station contains a compression-mode determining means for determining data transmission in said compressed mode and wherein said time interval corresponds to a number of data frames indicated in said IF measurement time interval indication signal and a number of idle time intervals of data frames where data transmission is carried in a compressed mode. 12. A subscriber station according to claim 1, wherein said IF measurement means also carries out measurements in an additional time interval where a data transmission takes place from said base transceiver station wherein said subscriber station contains a deletion means for deleting the data which arrives in said additional time interval. 13. A method for performing inter-frequency measurements in a subscriber station of a mobile communication system having at least one base transceiver station and a network control means, comprising the steps of selecting, during a connection between said subscriber station and said base transceiver station, an IF measurement time interval in a network control means and sending from said network control means to said subscriber station an IF measurement time interval indication signal indicating said time interval of said connection in which said IF measurements are to be carried out by said subscriber station; detecting said IF measurement time interval indication signal in said subscriber station; and performing said IF measurements in said subscriber station in said time interval of said connection as indicated by said IF measurement time interval indication signal. 14. A method according to claim 13, wherein said IF measurements are carried out over the entire time interval indicated by the IF measurement time interval indication signal. 15. A method according to claim 13, wherein said IF measurements are performed in response to an IF measurement trigger signal. 16. A method according to claim 15, wherein said IF measurement time interval indication signal is sent in said IF measurement trigger signal. 17. A method according to claim 15, including the steps of determining wherein transmission conditions in said mobile communication system necessitate an IF handover of said subscriber station and generating said IF measurement trigger signal when it is determined that an IF handover is necessary. 18. A method according to claim 17, wherein said determining step whether transmission conditions in said mobile communication system necessitate an IF handover of said subscriber station is carried out by an IF handover request means located in a network control means of said mobile communication system and said IF measurement trigger signal is transmitted to said subscriber station via a base transceiver station in response to determining a network-evaluated handover. 19. A method according to claim 17, wherein said determining whether transmission conditions in said mobile communication system necessitate an IF handover of said subscriber station and said generation of said IF measurement trigger signal is carried out by an IF handover request means located in said subscriber station in response to determining a mobile-evaluated handover. 20. A method according to claim 13, wherein in said subscriber station the quality of service on an established communication connection is monitored and information of the quality of service is transmitted to said network control means. 21. A method according to claim 13, wherein in said base transceiver station the quality of service on an established communication connection is monitored and information of the quality of service is transmitted to said network control means. 22. A method for performing inter-frequency measurements in a subscriber station of a mobile communication system having at least one base transceiver station and a network control means, comprising the steps of selecting, during a connection between said subscriber station and said base transceiver station, an IF measurement time interval in a network control means and sending from said network control means to said subscriber station an IF measurement time interval indication signal indicating said time interval of said connection in which said IF measurements are to be carried out by said subscriber station; detecting said IF measurement time interval indication signal in said subscriber station; and performing said IF measurements in said subscriber station in said time interval of said connection as indicated by said IF measurement time interval indication signal; and wherein in said subscriber station the quality of service on an established communication connection is monitored and information of the quality of service is transmitted to said network control means; and wherein said time interval of said communication connection is selected on the basis of said information on the quality of service, wherein said time interval is selected to be a time interval in which a temporary reduction of the quality of service due to said IF measurement means performing said IF measurements is allowed. 23. A method according to claim 20, wherein said time interval of said communication connection is selected on the basis of said information on the quality of service, wherein said time interval is selected to be a time interval in which a temporary reduction of the quality of service due to said IF measurement means performing said IF measurements is allowed. 24. A method according to claim 13, wherein during said connection a delay-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein data arriving from said base transceiver station during said time interval is deleted and a transmission power on the down-link and the up-link on the communication connection before the beginning of said time interval and/or after the end of said time interval is increased. 25. A method according to claim 13, wherein during said connection a loss-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein said transmission data before it is sent on the down-link of said communication connection is temporarily stored in a transmission buffer means having a predetermined size in said network control means, wherein in said time interval in which said IF measurements are carried out by said IF measurement means, said transmission buffer temporarily stores at least a portion of said transmission data to be sent during said time interval and said network control means sends said stored data to the subscriber station after said time interval has ended. 26. A method according to claim 13, wherein during said connection a loss-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein said network control means comprises a transmission buffer means of a predetermined size for intermediate storage of said transmission data before it is sent on the down-link of said communication connection, wherein in said time interval in which said IF measurements are carried out by said IF measurement means, said network control means decreases the data transmission rate and increases the data transmission rate again after said time interval has ended. 27. A method according to claim 26, wherein if in the time interval the data amount to be transmitted is larger than the predetermined size of said buffer means, the network control means performs a re-scheduling with other buffer means to provide an increased storage capacity for the intermediate storage of transmission data. 28. A method according to claim 26, wherein if in the time interval the data amount to be transmitted is larger than the predetermined size of the buffer means, said network control means is adapted to perform a dynamic buffer scheduling with other buffer means in order to increase the buffer size of said buffer means and decrease the buffer size of said other buffers means in the time interval. 29. A method according to claim 26, wherein if in the time interval the data amount to be transmitted is larger than the predetermined size of said buffer means, a deletion means of said network control means deletes at least a portion of the data to be transmitted in said time interval. 30. A method according to claim 29, wherein said IF handover request means comprises a transmission ratio determining means adapted to determine the ratio between transmitted and received data frames and the measurement time, said IF handover request means outputs said IF measurement trigger signal when said transmission/reception ratio is lower than a predetermined ratio. 31. A method according to claim 13, wherein a data transmission between said base transceiver stations and said subscriber station is carried out by transmitting data frames including a control portion and a data portion, wherein in a compressed mode of operation data in said data portion in at least one time slot of a data frame is compressed in said network control means such that an idle time interval is provided in said time slot where no data transmission occurs, wherein a data transmission in said compressed mode is detected in said subscriber station and wherein said time interval corresponds to a number of data frames indicated in said IF measurement time interval indication signal as well as a number of idle time intervals of data frames where data transmission is carried in a compressed mode. 32. A method according to claim 13, wherein said IF measurements are also carried out in an additional time interval where a data transmission takes place from said base transceiver station wherein the data which arrives in said additional time interval from said network control means is discarded in said subscriber station. 33. A mobile communication system including at least one subscriber station including an inter-frequency measurement means adapted to perform IF measurements, at least one base transceiver station, and a network control means for performing data transmissions with said subscriber station during a connection, wherein said network control means comprises an IF measurement time interval selecting means adapted to select a time interval of said connection in which said subscriber station is to carry out IF measurements and adapted to send to said subscriber station an IF measurement time interval indication signal indicating said time interval; and said subscriber station comprising a time interval signal detection means adapted to detect in a transmission from said network control means said IF measurement time interval indication signal indicating said time interval, wherein said IF measurement means is adapted to perform said IF measurements in said time interval indicated in said detected IF measurement time interval indication signal. 34. A system according to claim 33, wherein said IF measurement means is adapted to carry out said IF measurements over the entire time interval. 35. A system according to claim 34, wherein said IF measurement means is adapted to perform said IF measurements in response to an IF measurement trigger signal. 36. A system according to claim 33, further including an IF handover request means adapted to determine whether transmission conditions in said mobile communication system necessitate an IF handover of said subscriber station and to generate said IF measurement trigger signal when it is determined that an IF handover is necessary. 37. A system according to claim 36, wherein said IF handover request means is located in said subscriber station and said IF measurement trigger signal is generated in response to determining a mobile-evaluated handover. 38. A system according to claim 33, wherein said subscriber station comprises a connection quality monitoring means adapted to monitor the quality of service on the established communication connection and to transmit information of the quality of service to said network control means. 39. A system according to claim 33, wherein said base transceiver station comprises a connection quality monitoring means adapted to monitor the quality of service on the established communication connection and to transmit information of the quality of service to said network control means. 40. A system according to claim 38, wherein said IF measurement time interval selecting means selects said time interval of said communication connection on the basis of said information on the quality of service, wherein said time interval is selected to be a time interval i:n which a temporary reduction of the quality of service due to said IF measurement means performing said IF measurements is allowed. 41. A system according to claim 40, wherein during said communication connection a delay-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein said subscriber station comprises a deletion means for deleting the data arriving from said base transceiver station during said time interval and said network control means and said subscriber station each comprise a power adjustment means to respectively increase a transmission power on the down-link and the up-link on the communication connection before the beginning of said time interval and/or after the end of said time interval. 42. A system according to claim 33, wherein said loss-sensitive data transmission is a data transmission during a web-browsing. 43. A system according to claim 33, wherein a data transmission between said base transceiver stations and said subscriber station is carried out by transmitting data frames including a control portion and a data portion, wherein said network control means comprises a compressed mode operation means adapted to compress in a compressed mode of operation data in said data portion in at least one time slot of a data frame such that an idle time interval is provided in said time slot where no data transmission occurs, wherein said subscriber station comprises a compressed mode determining means for determining a data transmission in said compressed mode and wherein said time interval corresponds to a number of data frames indicated in said IF measurement time interval indication signal as well as a number of idle time portions of data frames where data transmission is carried in a compressed mode. 44. A network control means of a mobile communication system for controlling data transmissions between at least subscriber station and at least one base transceiver station on an established connection, comprising: said network control means comprising an IF measurement time interval selecting means adapted to select a time interval of a connection in which said subscriber station is to carry out IF measurements and adapted to send to said subscriber station an IF measurement time interval indication signal indicating said time interval. 45. A network control means according to claim 44, wherein said network control means sends said IF measurement time interval indication signal together with an IF measurement trigger signal from said IF measurement time interval selecting means. 46. A network control means according to claim 45, including: an IF handover request means adapted to determine whether transmission conditions in said mobile communication system necessitate an IF handover of said subscriber station and to generate said IF measurement trigger signal when it is determined that an IF handover is necessary. 47. A network control means according to claim 44, wherein said IF measurement time interval selecting means selects said time interval of said communication connection on the basis of an information on the quality of service, wherein said time interval is selected to be a time interval in which a temporary reduction of the quality of service due to said IF measurement means performing said IF measurements is allowed. 48. A network control means according to claim 46, wherein during said communication connection a delay-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein said network control means comprises a power adjustment means to respectively increase a transmission power on the down-link on the communication connection before the beginning of said time interval and/or after the end of said time interval. 49. A network control means according to claim 47, wherein during a communication connection a loss-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein said network control means comprises a transmission buffer means of a predetermined size for intermediate storage of said transmission data before it is sent on the down-link of said communication connection, wherein in said time interval in which said IF measurements are carried out by said IF measurement means (IFMM), said transmission buffer temporarily stores at least a portion of said transmission data to be sent during said time interval and said network control means sends said stored data to the subscriber station after said time interval has ended. 50. A network control means according to claim 47, wherein during a communication connection a loss-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein said network control means comprises a transmission buffer means of a predetermined size for intermediate storage of said transmission data before it is sent on the down-link of said communication connection, wherein in said time interval in which said IF measurements are carried out by said IF measurement means, said network control means decreases the data transmission rate and increases the data transmission rate again after said time interval has ended. 51. A network control means according to claim 49, wherein, if in the time interval the data amount to be transmitted is larger than the predetermined size of said buffer means, the network control means is adapted to perform a re-scheduling with other buffer means to provide an increased storage capacity for the intermediate storage of transmission data. 52. A network control means according to claim 49, wherein if in the time interval the data amount to be transmitted is larger than the predetermined size of the buffer means, said network control means is adapted to perform a dynamic buffer scheduling with other buffer means in order to increase the buffer size of said buffer means and decrease the buffer size of said other buffers means in the time interval. 53. A network control means according to claim 49, wherein, if in the time interval the data amount to be transmitted is larger than the predetermined size of said buffer means, a deletion means of said network control means deletes at least a portion of the data to be transmitted in said time interval. 54. A network control means according to claim 46, wherein said IF handover request means comprises a transmission ratio determining means adapted to determine a ratio between transmitted and received data frames and the measurement time, said IF handover request means outputs said IF measurement trigger signal when said transmission/reception ratio is lower than a predetermined ratio. 55. A mobile communication system comprising at least one base transceiver station, a network control means, and at least one subscriber station, the network control means comprising an IF measurement time interval selecting means adapted to select a time interval of a connection in which said at least one subscriber station is to carry out IF measurements and adapted to send to said at least one subscriber station an IF measurement time interval indication signal indicating said time interval; the at least one subscriber station comprising an inter-frequency (P) measurement means (IFMM) adapted to perform IF measurements and a time interval signal detection means adapted to detect in a transmission from said network control means the IF measurement time interval indication signal indicating the time interval of the connection between said at least one subscriber station and said base transceiver station in which IF measurements are to be carried out by said at least one subscriber station, wherein said IF measurement means is adapted to perform said IF measurements in said time interval indicated in said IF measurement time interval indication signal. 56. A subscriber station of a mobile communication system having at least one base transceiver station and a network control means, including an inter-frequency measurement means adapted to perform IF measurements, comprising: a time interval signal detection means adapted to detect in a transmission from said network control means an IF measurement time interval indication signal indicating a time interval of an established connection between said subscriber station and said base transceiver station in which IF measurements are to be carried out by said subscriber station, wherein said IF measurement means is adapted to perform said IF measurements in said time interval indicated in said IF measurement time interval indication signal; and wherein during said connection a delay-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein said subscriber station comprises a deletion means for deleting the data arriving from said base transceiver station during said time interval and a power adjustment means to increase a transmission power on the up-link on the communication connection before the beginning of said time interval and/or after the end of said time interval. 57. A method for performing inter-frequency measurements in a subscriber station of a mobile communication system having at least one base transceiver station and a network control means, comprising the steps of selecting, during a connection between said subscriber station and said base transceiver station, an IF measurement time interval in a network control means and sending from said network control means to said subscriber station an IF measurement time interval indication signal indicating said time interval of said connection in which said IF measurements are to be carried out by said subscriber station; detecting said IF measurement time interval indication signal in said subscriber station; and performing said IF measurements in said subscriber station in said time interval of said connection as indicated by said IF measurement time interval indication signal; and wherein during said connection a delay-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein data arriving from said base transceiver station during said time interval is deleted and a transmission power on the down-link and the up-link on the communication connection before the beginning of said time interval and/or after the end of said time interval is increased. 58. A method for performing inter-frequency measurements in a subscriber station of a mobile communication system having at least one base transceiver station and a network control means, comprising the steps of selecting, during a connection between said subscriber station and said base transceiver station, an IF measurement time interval in a network control means and sending from said network control ens to said subscriber station an IF measurement time interval indication signal indicating said time interval of said connection in which said IF measurements are to be carried out by said subscriber station; detecting said IF measurement time interval indication signal in said subscriber station; and performing said IF measurements in said subscriber station in said time interval of said connection as indicated by said IF measurement time interval indication signal; and wherein during said connection a loss-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein said transmission data before it is sent on the down-link of said communication connection is temporarily stored in a transmission buffer means having a predetermined size in said network control means, wherein in said time interval in which said IF measurements are carried out by said IF measurement means, said transmission buffer temporarily stores at least a portion of said transmission data to be sent during said time interval and said network control means sends said stored data to the subscriber station after said time interval has ended. 59. A method for performing inter-frequency measurements in a subscriber station of a mobile communication system having at least one base transceiver station and a network control means, comprising the steps of selecting, during a connection between said subscriber station and said base transceiver station, an IF measurement time interval in a network control means and sending from said network control means to said subscriber station an IF measurement time interval indication signal indicating said time interval of said connection in which said IF measurements are to be carried out by said subscriber station; detecting said IF measurement time interval indication signal in said subscriber station; and performing said IF measurements in said subscriber station in said time interval of said connection as indicated by said IF measurement time interval indication signal; and wherein during said connection a loss-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein said network control means comprises a transmission buffer means of a predetermined size for intermediate storage of said transmission data before it is sent on the down-link of said communication connection, wherein in said time interval in which said IF measurements are carried out by said IF measurement means, said network control means decreases the data transmission rate and increases the data transmission rate again after said time interval has ended. 60. A method for performing inter-frequency measurements in a subscriber station of a mobile communication system having at least one base transceiver station and a network control means, comprising the steps of selecting, during a connection between said subscriber station and said base transceiver station, an IF measurement time interval in a network control means and sending from said network control means to said subscriber station an IF measurement time interval indication signal indicating said time interval of said connection in which said IF measurements are to be carried out by said subscriber station; detecting said IF measurement time interval indication signal in said subscriber station; and performing said IF measurements in said subscriber station in said time interval of said connection as indicated by said IF measurement time interval indication signal; and wherein during said connection a loss-sensitive data transmission is performed between said base transceiver station and said subscriber station, wherein said network control means comprises a transmission buffer means of a predetermined size for intermediate storage of said transmission data before it is sent on the down-link of said communication connection, wherein in said time interval in which said IF measurements are carried out by IF measurement means (IFMM), said network control means decreases the data transmission rate and increases the data transmission rate again after said time interval has ended; and wherein if in the time interval the data amount to be transmitted is larger than the predetermined size of said buffer means, a deletion means of said network control means deletes at least a portion of the data to be transmitted in said time interval; and wherein IF handover request means comprises a transmission ratio determining means adapted to determine the ratio between transmitted and received data frames and the measurement time, said IF handover request means outputs an IF measurement trigger signal when said transmission/reception ratio is lower than a predetermined ratio.