Method and apparatus for random access to radio services

1. Apparatus comprising:

a memory to store a table of adaptable associations between control information and code sequences;

a data processor configured to detect a condition and to dynamically adapt one or more of the associations in the table stored in memory between control information and code sequences depending on the detected condition; and

a transmitter, coupled to the data processor, to transmit one of the code sequences selected based on the dynamically adapted one or more of the associations.

2. The apparatus according to claim 1 , further comprising a receiver, coupled to the data processor, configured to receive a control signal that indicates the detected condition.

3. The apparatus according to claim 2 , wherein the detected condition is a rate of occurrence of certain control information stored in the table.

4. The apparatus according to claim 3 , wherein the rate of occurrence of certain control information stored in the table changes in a cell in which the apparatus is located.

5. The apparatus according to claim 3 , wherein the rate of occurrence of certain control information stored in the table is determined by a base station in the cell receiving the transmitted code sequence.

6. The apparatus according to claim 3 , wherein the rate of occurrence of certain control information stored in the table changes depending on a time of day.

7. The apparatus according to claim 3 , wherein a larger number of different base code sequences or a larger number of different code sequences that are derived from a base sequence are associated in the table with more frequently occurring control information as compared to a smaller number of different base code sequences or a smaller number of different code sequences that are derived from a base sequence associated that are associated in the table with less frequently occurring control information.

8. The apparatus according to claim 1 , wherein a larger number of different base code sequences or a larger number of different code sequences that are derived from a base sequence are associated in the table with first control information as compared to a smaller number of different base code sequences or a smaller number of different code sequences that are derived from a base sequence associated that are associated in the table with second control information, where the first control information is determined to occur more frequently than the second control information.

9. The apparatus according to claim 8 , wherein different derived sequences are respectively associated with different amounts of data or reception qualities and have different cyclic shifts.

10. The apparatus according to claim 1 , wherein a number of different code sequences in the table is based on a significance, priority, number of retransmissions, and/or quality of service of the associated control information.

11. The apparatus according to claim 1 , wherein the transmitter is configured to transmit the selected code sequence on a random access channel.

12. A radio communication mobile station including the apparatus of claim 1 .

13. A method comprising:

storing in a memory a table of adaptable associations between control information and code sequences;

dynamically adapting, by a data processor, one or more of the associations in the table stored in memory between control information and code sequences depending on a detected condition; and

transmitting one of the code sequences selected based on the dynamically adapted one or more of the associations.

14. A method comprising:

a data processor associating a larger number of different base code sequences or a larger number of different code sequences that are derived from a base sequence to first control information as compared to a smaller number of different base code sequences or a smaller number of different code sequences that are derived from a base sequence associated with second control information, where the first control information is determined to occur more frequently than the second control information;

receiving control information; and

selecting one of the code sequences based on the received control information for a subsequent transmission.

15. The method in claim 14 , further comprising:

receiving a control signal that indicates the detected condition.

16. The method in claim 15 , wherein the detected condition is a rate of occurrence of certain control information stored in the table.

17. The method in claim 16 , wherein the rate of occurrence of certain control information stored in the table changes in a cell in which the apparatus is located.

18. The method in claim 16 , wherein the rate of occurrence of certain control information stored in the table is determined by a base station in the cell receiving the transmitted code sequence.

19. Apparatus comprising:

a data processor configured to associate a larger number of different code sequences as compared to a smaller number of different code sequences associated with second control information, where the first control information is determined to occur more frequently than the second control information, and

a receiver, coupled to the data processor, configured to receive control information, and

wherein the data processor is configured to select one of the code sequences based on the received control information for a subsequent transmission.

20. The apparatus according to claim 19 , wherein the different codes sequences are different base code sequences derived from a base sequence.