Radio channel allocation and link adaptation in cellular telecommunication system

• US 8,320,947 B2
• Filed: 12/21/2006
• Issued: 11/27/2012
• Est. Priority Date: 12/21/2005
• Status: Active Grant

• Current Assignee: Conversant Wireless Licensing S.à.r.l. (f/k/a Core Wireless Licensing S.a.r.l.) (MOSAID Technologies Inc. (f/k/a Conversant Intellectual Property Management))
• Original Assignee: Conversant Wireless Licensing S.à.r.l. (f/k/a Core Wireless Licensing S.a.r.l.) (MOSAID Technologies Inc. (f/k/a Conversant Intellectual Property Management))
• Inventors: Hulkkonen, Jari, Piirainen, Olli
• Primary Examiner(s): RAMPURIA, SHARAD K
• Application Number:
  US11/642,551
• Publication Number:
  US 20070173271A1
• Time in Patent Office: 2,168 Days
• Field of Search: 455447-4522, 455/454, 455509-514, 455/42, 455/63.1, 370/329, 370/332, 370/333
• US Class Current: 455/509
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/3488 Multiresolution systems
• CPC Class Codes: H04W 72/541 using the level of interference

Abstract

A network element, a terminal and a method of allocating a radio channel to a connection between a terminal and a base station in a telecommunication system are provided. The number and properties of potential interferers in a plurality of available radio channels are determined, and channel allocation is performed on the basis of the determination.

Claims

1. A method, comprising:

determining, by a base station controller, a number and properties of potential interferers in a plurality of available radio channels, the properties of the potential interferers comprising modulation methods used by the potential interferers; and

performing, by the base station controller, channel allocation for a terminal and selecting a modulation method for the allocated channel on the basis of the determination.

2. The method of claim 1, wherein

the determination of the number and properties of potential interferers comprises calculating the number and properties of potential interferers in a plurality of radio channels, and comparing the number and properties of potential interferers of the plurality of radio channels with each other, and

wherein performing channel allocation comprises performing channel allocation on the basis of the comparison.

3. The method of claim 1, wherein the properties of the potential interferers comprise at least one of a signal level of the interferer, and signal bandwidth of the interferer.

4. The method of claim 1, further comprising prioritizing available radio channels according to the number or the properties of potential interferers.

5. The method of claim 2, wherein the calculation of the number and properties of potential interferers in a plurality of radio channels comprises receiving downlink measurements carried out in a number of terminals of a telecommunication system.

6. The method of claim 1, further comprising determining for a number of available radio channels, on the basis of downlink measurements carried out by a number of terminals of a telecommunication system, cells of the telecommunication system which would be interfered with by uplink transmission of a terminal to which a radio channel is to be allocated.

7. The method of claim 1, further comprising:

transmitting a group of carrier waves modulated at a first modulation symbol rate, the carrier waves being separated by a predetermined carrier spacing; and

generating at least one wide-band carrier wave in the group of carrier waves by applying linear modulation at a second modulation symbol rate, the second modulation symbol rate being a multiple of the first modulation symbol rate, while preserving the predetermined carrier spacing and allowing the at least one wide-band carrier wave to overlap with at least one adjacent carrier wave.

8. The method of claim 7, further comprising:

utilizing frame based transmission, a frame comprising time slots; and

utilizing a wide-band carrier at least in one time slot of the frame.

9. The method of claim 8, further comprising:

allocating a time slot in which a wide-band carrier is used to a terminal.

10. A method, comprising:

receiving, at a base station controller, downlink signal strength measurements taken by terminals of base stations surrounding each terminal;

calculating, by the base station controller, base station coverage areas which would be interfered with by uplink transmission of a terminal to which a radio channel is to be allocated;

calculating, by the base station controller, a number of interferers interfering with the uplink transmission of a terminal to which the radio channel is to be allocated and properties of the interferers, the properties of the interferers comprising modulations methods used in the interferers; and

performing, by the base station controller, channel allocation for the terminal and selecting a modulation method for the allocated channel on a terminal on the basis of the calculations.

11. The method of claim 10, further comprising:

rearranging channel allocations of a base station serving the terminal to which the radio channel is to be allocated and of the surrounding base stations prior to performing the channel allocation so that the radio channel to be allocated is interfered with by only one interfering signal.

12. An apparatus of a base station controller, comprising:

a processor; and

a memory including computer program code, the memory and the computer program code configured to, with the processor, cause the apparatus at least to

determine a number and properties of potential interferers in a plurality of available radio channels, the properties of the potential interferers comprising modulation methods used by the potential interferers, and

perform channel allocation for a terminal and select a modulation method for the allocated channel on a connection on the basis of the determination.

13. The apparatus of claim 12, wherein the properties of potential interferers comprise at least one of a signal level of the interferer and signal bandwidth of the interferer.

14. The apparatus of claim 12, wherein the apparatus is configured to prioritize available radio channels primarily according to the number of potential interferers and secondarily according to the properties of the interferers, and perform channel allocation on the basis of the prioritization.

15. An apparatus of a base station controller, comprising:

a processor; and

a memory including computer program code, the memory and the computer program code configured to, with the processor, cause the apparatus at least to

calculate base station coverage areas which would be interfered with by uplink transmission of a terminal to which a radio channel is to be allocated,

calculate the number of interferers interfering with the uplink transmission of the terminal to which the radio channel is to be allocated and properties of the interferers, the properties of the interferers comprising modulations methods used by the interferers, and

perform channel allocation for the terminal and select a modulation method for the allocated channel on a terminal on the basis of the calculations.

16. The apparatus of claim 15, wherein available radio channels comprise:

a group of carrier waves modulated at a first modulation symbol rate, the carrier waves being separated by a predetermined carrier spacing; and

at least one wide-band carrier wave generated by applying linear modulation at a second modulation symbol rate, the second modulation symbol rate being a multiple of the first modulation symbol rate, while preserving the predetermined carrier spacing and allowing the at least one wide-band carrier wave to overlap with at least one adjacent carrier wave.

17. A controller configured to:

determine, in a base station controller, a number and properties of potential interferers in a plurality of radio channels, the properties of the potential interferers comprising modulation methods used by the potential interferers; and

perform, by the base station controller, channel allocation for a terminal and select a modulation method on a terminal on the basis of the determination.

18. A system, comprising:

a base station controller configured to determine a number and properties of potential interferers in a plurality of available radio channels, the properties of the potential interferers comprising modulation methods used by the potential interferers, and perform channel allocation for a terminal and select a modulation method for the allocated channel on a connection on the basis of the determination.

19. A terminal, configured to:

determine a number and properties of potential interferers in a plurality of available radio channels, the properties of the potential interferers comprising modulation methods used by the potential interferers; and

perform channel allocation and select a modulation method for the allocated channel on a connection on the basis of the determination,

wherein the plurality of available radio channels comprises;

a group of carrier waves modulated at a first modulation symbol rate, the carrier waves being separated by a predetermined carrier spacing; and

at least one wide-band carrier wave generated by applying linear modulation at a second modulation symbol rate, the second modulation symbol rate being a multiple of the first modulation symbol rate, while preserving the predetermined carrier spacing and allowing the at least one wide-band carrier wave to overlap with at least one adjacent carrier wave.

20. A computer program product embodied on a computer distribution medium, the computer program product encoding a computer program of instructions for executing a computer process, the process comprising:

determining, by a base station controller, a number and properties of potential interferers in a plurality of available radio channels, the properties of the potential interferers comprising modulation methods used by the potential interferers; and

performing, by the base station controller, channel allocation for a terminal and selecting a modulation method for the allocated channel on the basis of the determination.

21. A computer program distribution medium readable by a computer and encoding a computer program of instructions for executing a computer process, the process comprising:

determining, at a base station controller, a number and properties of potential interferers in a plurality of available radio channels, the properties of the potential interferers comprising modulation methods used by the potential interferers; and

performing, by the base station controller, channel allocation for a terminal, and selecting a modulation method for the allocated channel on the basis of the determination.

22. The computer program distribution medium of claim 21, the distribution medium including at least one of a computer readable medium, a program storage medium, a record medium, and a computer readable memory.