Method and arrangement for effecting transmission power control and/or handover of a mobile station assigned two or more time slots per frame in a TDMA telecommunications system

• US 5,898,925 A
• Filed: 04/04/1996
• Issued: 04/27/1999
• Est. Priority Date: 05/11/1994
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Nokia Mobile Phones UK Limited (Nokia Corporation), Nokia Telecommunications Oy (Nokia Corporation)
• Inventors: Honkasalo, Zhi-Chun, Honkasalo, Harri, Jokinen, Harri, Posti, Harri
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): SOBUTKA, PHILIP
• Application Number:
  US08/591,557
• Time in Patent Office: 1,118 Days
• Field of Search: 455/33.1, 455/33.2, 455/54.1, 455/54.2, 455/56.1, 455/68, 455/69, 455/67.1, 455/67.7, 455/38.1, 455/403, 455/422, 455/434, 455/436, 455/437, 455/438, 455/450 , 455/451, 455/452, 455/455, 455/509, 455/511, 455/517, 455/522, 370/337, 370/347, 370/468, 379/59, 379/60, 379/63
• US Class Current: 455/437
• CPC Class Codes: H04W 36/302 due to low signal strength
• CPC Class Codes: H04W 52/225 Calculation of statistics, e.g. average, variance
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

Abstract

A method and an arrangement for controlling transmitting power of a mobile station and carrying out a handover in a mobile telecommunications system in which data is transmitted over the radio path between a mobile station and a base station as bursts in time slots of successive frames. A mobile station can be allocated at least two time slots in each frame for high-speed data transmission. The mobile station is arranged to measure the characteristics of the received signal, such as the signal level and/or quality, in each time slot allocated to the mobile station, and the fixed radio network is arranged to control the transmitting power of the mobile station and/or make the decision on a handover on the basis of a combination of measurement results of two or more time slots, or on the basis of the measurement result of the poorest time slot.

Claims

1. A method for power control of a mobile station in a mobile telecommunications system, the method comprising:

transmitting data over a radio path between a mobile station and a base station of a fixed radio network as bursts in time slots of successive frames;

allocating the mobile station at least two time slots in each frame for transmitting a high-speed data signal having a data rate which is higher than that supported by use of one time slot in each frame;

splitting the high-speed data signal into a plurality of lower-speed sub-signals corresponding in number to the number of allocated time slots;

the transmitting including transmitting the lower-speed sub-signals over the radio path as respective separate bursts in each of the allocated time slots;

upon reception of the separate bursts transmitted over the radio path, combining the lower-speed sub-signals, thereby restoring the high-speed data signal;

measuring, at the mobile station in each time slot allocated to the mobile station, at least one characteristic of a received signal, the characteristic selected from the group consisting of signal level and signal quality; and

controlling the transmitting power of the mobile station on the basis of one of (a) a combination of measurement results of two or more time slots assigned to the mobile station, and (b) a measurement result of the poorest time slot in relation to the at least one characteristic.

2. A method as claimed in claim 1, further comprising:

assigning the mobile station a parallel control channel common to all the time slots assigned to the mobile station;

transmitting a combination of the measurement results of all the time slots assigned to the mobile station from the mobile station to the fixed radio network through the common, parallel control channel; and

controlling the transmitting power of the mobile station in all the time slots assigned to the mobile station through the common, parallel control channel.

3. A method as claimed in claim 1, further comprising:

assigning the mobile station a dedicated parallel control channel for each time slot assigned to the mobile station;

transmitting the measurement result of each time slot assigned to the mobile station, separately, from the mobile station to the fixed radio network through the parallel control channel corresponding to each respective the time slot; and

controlling the transmitting power of the mobile station in each time slot assigned to the mobile station through the control channel corresponding to the respective time slot.

4. A method as claimed in claim 1, further comprising:

assigning the mobile station a dedicated parallel control channel for each time slot assigned to the mobile station;

transmitting the measurement result of each time slot assigned to the mobile stations, separately, from the mobile station to the fixed radio network through the parallel control channel corresponding to each respective the time slot; and

controlling the transmitting power of the mobile station in all the time slots assigned to the mobile station through one the common, parallel control channel.

5. A handover method in a mobile telecommunications system, the method comprising:

transmitting data over a radio path between a mobile station and a base station of a fixed radio network as bursts in time slots of successive frames;

allocating to the mobile station at least two time slots in each frame for transmitting a high-speed data signal having a data rate which is higher than that supported by use of one time slot in each frame;

splitting the high-speed data signal into a plurality of lower-speed sub-signals corresponding in number to the number of allocated time slots;

the transmitting including transmitting the lower-speed sub-signals over the radio path as respective separate bursts in each of the allocated time slots;

upon reception of the separate bursts transmitted over the radio path, combining the lower-speed sub-signals, thereby restoring the high-speed data signal;

measuring, at the mobile station in each time slot allocated to the mobile station, at least one characteristic of a received signal, the one characteristic selected from the group consisting of signal level and signal quality; and

making a handover decision in regard to the mobile station on the basis of one of (a) a combination of measurement results of two or more time slots assigned to the mobile station, and (b) a measurement result of the poorest time slot in relation to the at least one characteristic.

6. A method as claimed in claim 5, further comprising:

assigning the mobile station a parallel control channel common to all the time slots assigned to the mobile station; and

transmitting a combination of the measurement results of all the time slots assigned to the mobile station from the mobile station to the fixed radio network through the common, parallel control channel.

7. A method as claimed in claim 5, further comprising:

assigning the mobile station a dedicated parallel control channel for each time slot assigned to the mobile station; and

transmitting the measurement result of each time slot assigned to the mobile station, separately, from the mobile station to the fixed radio network through the parallel control channel corresponding to each respective the time slot.

8. A control arrangement of a mobile station in a mobile telecommunications system in which data is transmitted over a radio path between the mobile station and a base station of a fixed radio network as bursts in time slots of successive frames, the arrangement comprising:

means for allocating the mobile station at least two time slots in each frame for transmitting a high-speed data signal having a data rate which is higher than that supported by use of one time slot in each frame;

means for splitting the high-speed data signal into a plurality of lower-speed sub-signals corresponding in number to the number of allocated time slots;

means for transmitting the lower-speed sub-signals over the radio path as respective separate bursts in each of allocated time slots;

means for combining the lower-speed sub-signals, upon reception of the separate bursts transmitted over the radio path, and thereby restoring the high-speed data signal;

the mobile station being arranged to measure at least one characteristic of a received signal, the characteristic selected from the group consisting of signal level and signal quality, in each time slot allocated to the mobile station; and

the fixed radio network being arranged to at least one of (a) control the transmitting power of the mobile station and (b) make a handover decision on the basis of (b1) a combination of measurement results of two or more time slots assigned to the mobile station, and (b2) a measurement result of the poorest time slot in relation to the at least one characteristic.

9. An arrangement as claimed in claim 8, wherein:

the mobile station has a parallel control channel common to all the time slots assigned to the mobile station; and

the mobile station is arranged to transmit a combination of measurement results of all the time slots assigned to the mobile station from the mobile station to the fixed radio network through the common, parallel control channel.

10. An arrangement as claimed in claim 9, wherein:

the fixed radio network is arranged to control the transmitting power of the mobile station in all the time slots assigned to the mobile station, through the common, parallel control channel.

11. An arrangement as claimed in claim 8, wherein:

the mobile station has a dedicated, parallel control channel for each of the time slots assigned to the mobile station; and

the mobile station is arranged to separately transmit a combination of the measurement results of all the time slots assigned to the mobile station to a fixed radio network through the parallel control channel corresponding to each respective the time slot.

12. An arrangement as claim in claim 11, wherein:

the fixed network is arranged to control the transmitting power of the mobile station in each time slot assigned to the mobile station, through the parallel control channel corresponding to each respective the time slot.

13. An arrangement as claimed in claim 11, wherein:

the fixed network is arranged to control the transmitting power of the mobile station in all the time slots assigned to the mobile station, through one parallel control channel.