Power control method and telecommunications system

Abstract

The invention describes a method of controlling transmission power in a telecommunications system comprising a first and a second transceiver. In the presented method, one power control command is transmitted during at least two time-slots from the second transceiver to the first transceiver and the one power control command is received at the first transceiver during at least two time-slots.

1. A method of controlling transmission power in a telecommunications system, comprising: a message structure comprising time-slots, the system comprising a first transceiver and a second transceiver,  the method further  comprising:
 controlling the transmission power of the  a first transceiver ( 101 )  based on a received  power control command received in a time- slot of a message structure from a second transceiver, wherein the message structure comprises time - slots, and    
 dividing one power control command into at least a first part and a second part to be transmitted respectively in at least two time-slots from the second transceiver to the first transceiver, the first part transmitted in a first time-slot and the second part transmitted in a second time-slot, and  
 receiving said one power control command at the first transceiver during at least two time-slots by receiving said first part from said first time-slot and said second part from said second time-slot, combining said first part and said second part to reform said one power control command, and using said reformed one power control command to make a single-increment power adjustment.  
 
     
     
       2. The method as claimed in  claim 1 , comprising transmitting one power control command, a n-parts, during n time-slots, wherein n=2, 3, . . . , in such a manner that the power control command is placed in m time-slots, wherein m=2, 3, . . , n. 
     
     
       3. The method as claimed in  claim 1 , comprising transmitting the power control command in such a manner that the number of power control bits in different time-slots varies. 
     
     
       4. The method as claimed in  claim 3 , comprising freeing the space required by the power control bits for other use in the time-slots, in which the number of power control bits is smaller than the average number of power control bits. 
     
     
       5. The method as claimed in  claim 3 , comprising reserving extra power control bits in the time-slots, in which the number of power control bits is larger than the average number of power control bits. 
     
     
       6. The method as claimed in  claim 1 , comprising transmitting one power control command in every second time-slot. 
     
     
       7. The method of  claim 1 , wherein, the reformed one power control command has a length of at least 3 bits. 
     
     
       8. The method of  claim 1 , wherein, the system uses a code division multiple access format with the message structure comprising time-slots and a number of power control bits in each time slot limited to a maximum of two. 
     
     
       9. A telecommunications system, wherein a message structure comprising time-slots is used, the system comprising a first transceiver ( 101 )  and a second transceiver ( 100 ) , wherein the first transceiver ( 101 )  is configured to control transmission power based on a received power control command,
 the second transceiver is configured to divide one power control command into a first part and a second part for transmission respectively in at least two time-slots to the first transceiver, and  
 the first transceiver is configured to receive said first part and said second part and, thereafter upon receipt, reform said received first and second parts into said one power control command during at least two time-slots, wherein,  
 said reformed one power control command is used to make a power adjustment.  
 
     
     
       10. A  The system as claimed in  claim 9 , wherein the second transceiver is configured to transmit one power control command during n time-slots, wherein n=2, 3, . . . , in such a manner that the power control command is placed in m time-slots, wherein m=2, 3, . . . , n. 
     
     
       11. The system as claimed in  claim 9 , wherein the second transceiver is configured to transmit the power control command in such a manner that the number of power control bits in different time-slots varies. 
     
     
       12. The system as claimed in  claim 11 , wherein the second transceiver is configured to free the space required by the power control bits for other use in the time-slots, in which the number of power control bits is smaller than the average number of power control bits. 
     
     
       13. The system as claimed in  claim 11 , wherein the second transceiver is configured to reserve extra power control bits in the time-slots, in which the number of power control bits is larger than the average number of power control bits. 
     
     
       14. The system as claimed in  claim 8 , wherein the second transceiver is configured to form the power control command on the basis of the signals received by it. 
     
     
       15. The system as claimed in  claim 9 , wherein the second transceiver is configured to transmit one power control command in every second time-slot. 
     
     
       16. The method of  claim 9 , wherein, the reformed one power control command has a length of at least 3 bits. 
     
     
       17. The telecommunications system of  claim 9 , wherein, a code division multiple access format is used and a number of power control bits in each time slot is limited to a maximum of two. 
     
     
       18. A method of controlling transmission power in a telecommunications system, in which a message structure comprising time-slots is used, the system comprising a first transceiver and a second transceiver, the method comprising controlling the transmission power of the first transceiver ( 101 )  based on a received power control command, the method comprising the steps of:
 dividing one power control command into plural divided command parts so power control bits that make up the one power control command are divided into the plural divided command parts;  
 transmitting, from the second transceiver to the first transceiver, each divided command part in a different one of at least two time-slots so that different parts of the power control bits that make up the one power control command are transmitted in different ones of the at least two time-slots;  
 receiving, at the first transceiver during different time-slots, each of the divided command parts and using the received divided command parts to reform the one power control command; and  
 controlling the transmission power of the first transceiver, in a single increment power change, based on the reformed one power control command comprised of the received divided command parts.  
 
     
     
       19. The method of  claim 18 , wherein, the reformed one power control command has a length of at least 3 bits. 
     
     
       20. A method of controlling transmission power in a telecommunications system, the method comprising:
   at a second device, determining a value of a power adjustment level for a first device for inclusion in a power control command to the first device;        defining values for a plurality of bits based on the determined value;        dividing the defined values for the plurality of bits into a plurality of bit sets, wherein a bit set of the plurality of bit sets includes at least one bit; and        transmitting each of the plurality of bit sets to the first device from the second device during different timeslots, wherein the plurality of bit sets are associated with the power control command.     
     
     
       21. The method of  claim 20 , wherein the plurality of bits include at least three bits. 
     
     
       22. The method of  claim 20 , wherein the plurality of bit sets include at least two bit sets. 
     
     
       23. The method of  claim 20 , wherein the number of bits in a bit set of the plurality of bit sets varies. 
     
     
       24. The method of  claim 20 , wherein the different timeslots are consecutive timeslots. 
     
     
       25. A method of controlling transmission power in a telecommunications system, the method comprising:
   receiving a plurality of bit sets at a first device from a second device, each bit set of the plurality of bit sets received during different timeslots;        determining a value of a power adjustment level for the first device by combining the received plurality of bit sets into a plurality of bits; and        controlling a transmission power of a transceiver of the first device based on the determined value.     
     
     
       26. The method of  claim 25 , wherein the plurality of bits include at least three bits. 
     
     
       27. The method of  claim 25 , wherein the plurality of bit sets include at least two bit sets. 
     
     
       28. The method of  claim 25 , wherein the number of bits in a bit set of the plurality of bit sets varies. 
     
     
       29. The method of  claim 25 , wherein the different timeslots are consecutive timeslots. 
     
     
       30. A device comprising:
   a transceiver configured to determine a value of a power adjustment level for a second device for inclusion in a power control command to the second device;        to define values for a plurality of bits based on the determined value; and        to divide the defined values for the plurality of bits into a plurality of bit sets, wherein a bit set of the plurality of bit sets includes at least one bit; and        an antenna configured to transmit each of the plurality of bit sets to the second device during different timeslots, wherein the plurality of bit sets are associated with the power control command.     
     
     
       31. The device of  claim 30 , wherein the plurality of bits include at least three bits. 
     
     
       32. The device of  claim 30 , wherein the plurality of bit sets include at least two bit sets. 
     
     
       33. The device of  claim 30 , wherein the number of bits in a bit set of the plurality of bit sets varies. 
     
     
       34. The device of  claim 30 , wherein the different timeslots are consecutive timeslots. 
     
     
       35. A device comprising:
   an antenna configured to receive a plurality of bit sets from a second device, each bit set of the plurality of bit sets received during different timeslots; and        a transceiver configured to determine a value of a power adjustment level for the first device by combining the received plurality of bit sets into a plurality of bits; and        to determine a transmission power adjustment for the transceiver based on the determined value.     
     
     
       36. The device of  claim 35 , wherein the plurality of bits include at least three bits. 
     
     
       37. The device of  claim 35 , wherein the plurality of bit sets include at least two bit sets. 
     
     
       38. The device of  claim 35 , wherein the number of bits in a bit set of the plurality of bit sets varies. 
     
     
       39. The device of  claim 35 , wherein the different timeslots are consecutive timeslots.