EFFICIENT ENCODING OF CONTROL SIGNALING FOR COMMUNICATION SYSTEMS WITH SCHEDULING AND LINK

• US 20090022133A1
• Filed: 09/09/2005
• Published: 01/22/2009
• Est. Priority Date: 09/09/2005
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Parkvall, Stefan, Frenger, Pal, Wiberg, Niclas, Furuskar, Anders
• Granted Patent: US 8,509,204 B2
• Time in Patent Office: Days
• US Class Current: 370/342
• CPC Class Codes: H03M 7/46 Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04

Abstract

The invention relates to a method of sending control information from a first node to a second node in a communications system providing a plurality of resource units for the transmission of data. The control information is sent by use of a code book comprising at least one code word identifying control information relating to data transmission over a resource unit. The code book is dynamically updated by means of repeatedly transmitting an updated version of code book information from the first node to the second node. The invention also relates to a first communications node comprising means for transmitting control information to a second node. The means for transmitting control information is adapted to transmitting the control information by use of a code book; and to repeatedly transmitting an updated version of code book information in order to achieve that the code book is dynamic.

Claims

1. A method of sending control information from a first node to a second node in a communications system providing a plurality of resource units for the transmission of data, wherein the control information is sent by use of a code book;

the code book comprises at least one code word identifying control information relating to data transmission over a resource unit; and

the code book is dynamically updated by means of repeatedly transmitting an updated version of code book information from the first node to the second node.

2. The method of claim 1, wherein the method comprises creating the code book;

assigning a code word to at least one resource unit in a manner so that the control information identified by the assigned code word applies to the resource unit to which the assigned code word is assigned;

creating resource unit usage information comprising at least one assigned code word, the resource unit usage information being indicative of at least one resource unit to which the assigned code word has been assigned;

sending the code book information to the second node; and

sending the resource unit usage information to the second node;

wherein the code book is dynamically updated by means of repeatedly performing the steps of creating a code book and sending code book information.

3. The method of claim 1, wherein the code book and/or the resource unit usage information comprises run length information indicating the number of resource units to which a code word has been assigned, so that the number of code words in the resource unit usage information may be smaller than the number of resource units to which a code word has been assigned.

4. The method of claim 1, wherein a resource unit is part of a time frame, and the steps of creating a code book and sending code book information is repeated for every n″

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time frame.

5. The method of claim 1, wherein the control information comprises an identity of a session to which a resource unit should be allocated.

6. The method of claim 1, wherein the control information comprises a transmission format to be applied to a resource unit.

7. The method of claim 1, wherein the control information applicable to a resource unit comprises an identity of a session to which a resource unit should be allocated and a transmission format to be applied to the resource unit;

the code book information comprises a session identity field identifying a session to which at least two resource units should be allocated on which different transmission formats should be used;

wherein the session identity field is associated with the transmission format of the at least two resource units.

8. The method of claim 1, wherein the code book information comprises a reference to control information stored in the second node.

9. A computer program product comprising computer code operable to execute the method of claim 1 when run on computer means.

10. A first communications node for communicating with a second communications node in a communications system providing a plurality of resource units for the transmission of data, the first node comprising means for transmitting control information to the second node, wherein the means for transmitting control information is adapted to transmitting the control information by use of a code book comprising at least one code identifying control information relating to data transmission over a resource unit;

and the means for transmitting is adapted to repeatedly transmitting an updated version of code book information in order to achieve that the code book is dynamic.

11. The first node of claim 10, further comprising means for creating the code book;

means for assigning a code word to at least one resource unit in a manner so that the control information identified by the assigned code word applies to the resource unit to which the assigned code word is assigned; and

means for creating resource unit usage information comprising at least one assigned code word, the resource unit usage information being indicative of at least one resource unit to which the assigned code word has been assigned;

wherein the means for transmitting comprises means for sending the code book information and the resource unit usage information to the second node; and

the means for creating a code book is arranged to repeatedly update the code book, and the means for sending the code book information is arranged to repeatedly send updated code book information, in order to achieve that the code book is dynamic.

12. The first node of claim 10, wherein the first node is radio base station and the second node is a mobile station.

13. The radio base station of claim 12, wherein the radio base station is adapted to serve a plurality of mobile stations within a cell, and the means for transmitting is adapted to sending the code book information on a channel to which all mobile stations within the cell can listen simultaneously.

14. The radio base station of claim 12, wherein the radio base station is arranged to receive quality measurements of a radio connection between the radio base station and the mobile station;

and the means for creating the code book is arranged to create the code book in accordance with the quality measurements, in a manner so that the gain achieved by creating the code book is greater than the cost of transmitting the code book information and the resource unit usage information.

15. A mobile radio communication system comprising the radio base station of claim 12.

16. A method of receiving control information relating to the transmission of data over resource units in a communications system, the method comprising:

receiving code book information by means of which a code book can be re-created, wherein the code book comprises at least one code word identifying control information applicable to a resource unit;

receiving a resource unit usage table comprising at least one to a resource unit assigned code word and being indicative of at least one resource unit to which the assigned code word has been assigned;

re-creating the code book by means of the code book information; and

identifying, by means of the code book, the control information identified by the at least one code of the resource unit usage table.

17. A computer program product comprising computer code operable to execute the method of claim 16 when run on a computer means.

18. A mobile station comprising the computer program product of claim 17, and computer means capable of executing said computer program code.

19. The mobile station of claim 18, wherein the mobile station comprises non-volatile storage arranged to store control information which can be used by the computer code in re-creating the code book;

and wherein the computer code comprises computer code operable to, when executed on the computer means, retrieve the contents of the nonvolatile storage and to use the contents in re-creating the code book.