Method for channel assignment and a radio communications system

• US 6,434,128 B1
• Filed: 08/09/1999
• Issued: 08/13/2002
• Est. Priority Date: 08/07/1998
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Li, Wanlin, Benz, Michael
• Primary Examiner(s): Kincaid, Lester G.
• Assistant Examiner(s): MEHRPOUR, NAGHMEH
• Application Number:
  US09/370,251
• Time in Patent Office: 1,100 Days
• Field of Search: 370/252, 370/280, 370/442, 370/337, 370/347, 370/336, 370/341, 370/329, 455/450, 455/452, 455/453, 455/455
• US Class Current: 370/329
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

In a method for channel assignment according to the invention, a TDD transmission method with timeslots as channels is used for radio transmission between a base station and mobile stations, with a switching point separating timeslots for a up link direction and timeslots for a down link direction. A transmission parameter relating to a transmission quality is in each case defined for the radio transmission between the base station and a plurality of mobile stations. The mobile stations with the qualitatively better transmission parameter are preferably assigned timeslots close to the switching point.

Claims

1. A method for assigning channels in a radio communications system, which comprises:

using a time division duplex transmission method with timeslots as channels for a radio transmission between a base station and mobile stations and with switching points separating the timeslots for an up-link direction and the timeslots for a down-link direction;

defining in each case at least one transmission parameter relating to a transmission quality for the radio transmission between the base station and the mobile stations; and

assigning the timeslots close to a switching point of the switching points to the mobile stations having a qualitatively better transmission parameter.

2. The method according to claim 1, which comprises defining an area switching point for a group of adjacent base stations, the mobile stations with the qualitatively better transmission parameter are assigned the timeslots between a radio-cell-specific switching point and the area switching point.

3. The method according to claim 2, which comprises defining an upper boundary for a difference between the radio-cell-specific switching point and the area switching point.

4. The method according to claim 3, which comprises setting the upper boundary in dependence on a number of the mobile stations for which a qualitatively good transmission parameter has been defined.

5. The method according to claim 2, which comprises defining a base switching point, and from the base switching point, radio-cell-specific switching points and area switching points may have an error of only a maximum of a further upper boundary.

6. The method according to claim 5, which comprises managing between groups of base stations with different area switching points buffer zones having radio cells in which the base switching point is binding.

7. The method according to claim 1, wherein the at least one transmission parameter is in each case related to a signal delay time between the base station and the mobile stations with short signal delay times being qualitatively better.

8. The method according to claim 1, wherein the at least one transmission parameter is in each case related to a reception power level in a respective receiving station with high reception power levels being qualitatively better.

9. The method according to claim 1, wherein the at least one transmission parameter is in each case related to an interference influence on the radio transmission from and to a respective mobile station on adjacent radio cells with a low interference influence being qualitatively better.

10. The method according to claim 1, wherein the at least one transmission parameter is in each case related to a position of a respective mobile station within a radio cell of the base station with a position in a core region of the radio cell being qualitatively better.

11. The method according to claim 1, wherein the radio transmission within at least parts of the radio communications system is frame-synchronous, and switching points of adjacent base stations are set in dependence on traffic.

12. A method for assigning channels in a radio communications system, which comprises:

using a TDD transmission method with timeslots as channels for a radio transmission between a base station and mobile stations, and with at least one switching point separating the timeslots for an up link direction and the timeslots for a down link direction;

defining a standard TDD scheme for a position of the at least one switching point;

defining in each case at least one transmission parameter relating to a transmission quality for the radio transmission between the base station and the mobile stations; and

assigning the mobile stations with a qualitatively better transmission parameter the timeslots close to the at least one switching point, the timeslots being used rather than the standard TDD scheme for an opposite transmission direction.

13. The method according to claim 12, wherein the at least one transmission parameter is in each case related to a signal delay time between the base station and the mobile stations with short signal delay times being qualitatively better.

14. The method according to claim 12, wherein the at least one transmission parameter is in each case related to a reception power level in a respective receiving station with high reception power levels being qualitatively better.

15. The method according to claim 12, wherein the at least one transmission parameter is in each case related to an interference influence on the radio transmission from and to a respective mobile station on adjacent radio cells with a low interference influence being qualitatively better.

16. The method according to claim 12, wherein the at least one transmission parameter is in each case related to a position of a respective mobile station within a radio cell of the base station with a position in a core region of the radio cell being qualitatively better.

17. The method according to claim 12, wherein the radio transmission within at least parts of the radio communications system is frame-synchronous, and switching points of adjacent base stations are set in dependence on traffic.

18. A radio communications system, comprising:

a plurality of mobile stations; and

a plurality of base stations, said base stations and said mobile stations having a radio interface for connecting said mobile stations to said base stations, said radio interface organized on a basis of a TDD transmission method with timeslots as channels and a switching point separating said timeslots for an up link direction and said timeslots for a down link direction, said base stations having a device for defining a transmission quality of transmission parameters between a respective base station and in each case one mobile station of said mobile stations, said base stations further having an assignment device for setting said switching point and for assigning said timeslots close to said switching point to said mobile stations with a qualitatively better transmission parameter.

19. The radio communications system according to claim 18, wherein said device for defining the transmission quality of the transmission parameters evaluates signals output by said mobile stations and received by said base stations.

20. The radio communications system according to claim 18, wherein said device for defining the transmission quality of the transmission parameters evaluates signals output by said base stations and received by said mobile stations once said mobile stations have signaled parameters relating to the transmission parameter.