Radio link reporting using multiple symbol sequences

1. A method for use in a wireless device, for radio link reporting, the method comprising:

obtaining a radio link reporting model, the radio link reporting model defining how to represent one radio link from a plurality of candidate radio links, using two or more symbol sequences from a set of constituent symbol sequences,

determining, based on the radio link reporting model, how to represent a selected radio link, from the plurality of candidate radio links, using two or more of the symbol sequences from the set of constituent symbol sequences, and

transmitting the two or more symbol sequences to a network node,

wherein the symbol sequences in the set of constituent symbol sequences have been selected such that the correlation between one symbol sequence in the set and any other symbol sequence in the set, is below a threshold.

2. The method of claim 1 , wherein the number of symbol sequences in the set of constituent symbol sequences is less than the number of candidate radio links.

3. The method according to claim 1 , wherein the obtaining comprises receiving information defining the radio link reporting model from the network node.

4. The method according to claim 1 , wherein the obtaining comprises reading information defining the radio link reporting model stored in the wireless device.

5. The method according to claim 1 , wherein the determining comprises determining two or more symbol sequences, from the set of constituent symbol sequences, to be transmitted.

6. The method according to claim 1 , wherein the determining comprises determining time, frequency and/or code resources to be used for the transmission of the two or more symbol sequences.

7. The method according to claim 1 , wherein the transmitting comprises transmitting the two or more symbol sequence separately in time, in frequency, or in the code domain.

8. The method according to claim 1 , wherein one of the two or more symbol sequences defines a group of candidate radio links and the second an identity of a candidate radio link within the group.

9. The method according to claim 1 , comprising:

performing measurements on the plurality of candidate radio links, and

selecting from the candidate radio links, based on the performed measurements, at least one by the wireless device preferred radio link for communication with the network.

10. The method according to claim 1 , wherein the radio link reporting is based on measurements performed on link quality measurement signals transmitted by a network node in the candidate radio links.

11. The method of claim 10 comprising:

dividing a set of bits representing the selected radio link into two or more bit combinations together identifying the selected radio link; and

mapping each of the two or more bit combinations, together identifying the selected radio link, to a symbol sequence from a set of constituent symbol sequences.

12. The method according to claim 1 , wherein the radio link reporting model comprises at least one of:

information defining how to divide one set of bits representing a selected radio link into two or more bit combinations together identifying a selected radio link; and

a mapping between different bit combinations and respective symbol sequence from a set of constituent symbol sequences.

13. A method for use in a network node, for receiving radio link reporting associated with a plurality of candidate radio links, the method comprising:

obtaining a radio link reporting model defining how to identify one radio link, from a plurality of candidate radio links, using two or more symbol sequences from a set of constituent symbol sequences,

receiving two or more of the symbol sequences from a set of constituent symbol sequences, the two or more symbol sequences together identifying a selected radio link, and

identifying the selected radio link based on the received two or more symbol sequences and the obtained radio link reporting model,

wherein the symbol sequences in the set of constituent symbol sequences have been selected such that the correlation between one symbol sequence in the set and any other symbol sequence in the set, is below a threshold.

14. The method of claim 13 , wherein the number of symbol sequences in the set of constituent symbol sequences is less than the number of candidate radio links.

15. The method according to claim 13 , wherein the identifying comprises identifying the selected radio link based on which symbol sequences, from the set of constituent symbol sequences, are received.

16. The method according to claim 13 , wherein the identifying comprises identifying the selected radio link based on which time, frequency and/or code resources are used for receiving the symbol sequences.

17. The method according to claim 13 , wherein one of the two or more symbol sequences defines a group of candidate radio links and the second an identity of a candidate radio link within the group.

18. The method according to claim 13 , wherein receiving comprises receiving the two or more symbol sequences separately in time, in frequency, or in the code domain.

19. The method according to claim 13 , comprising:

providing information defining the radio link reporting model to the wireless device.

20. The method according to claim 13 , wherein the reporting is based on measurements performed on link quality measurement signals transmitted by a network node in the candidate radio links.

21. The method according to claim 13 , wherein the identifying comprises:

determining bit combinations represented by the received symbol sequences; and

determining a set of bits representing a selected radio link by merging the determined bit combinations.

22. The method according to claim 13 , wherein the radio link reporting model comprises:

a mapping between the symbol sequences and a respective bit combination; and

information defining how to merge two or more of the bit combinations together identifying the selected radio link into one set of bits representing the selected radio link.

23. A wireless device being configured for radio link reporting, the wireless device comprising:

circuitry communication interface; and

processing circuitry configured to cause the wireless device:

to obtain a radio link reporting model, the radio link reporting model defining how to represent one radio link from a plurality of candidate radio links, using two or more symbol sequences from a set of constituent symbol sequences,

to determine, based on the radio link reporting model, how to represent a selected radio link, from the plurality of candidate radio links, using two or more of the symbol sequences from the set of constituent symbol sequences, and

to transmit the two or more symbol sequences to a network node,

wherein the symbol sequences in the set of constituent symbol sequences have been selected such that the correlation between one symbol sequence in the set and any other symbol sequence in the set, is below a threshold.

24. A network node in a cellular communication network configured for receiving radio link reporting associated with a plurality of candidate radio links, the network node, comprising:

a communication interface; and

processing circuitry configured to cause the network node:

to obtain a radio link reporting model defining how to identify one radio link, from a plurality of candidate radio links, using two or more symbol sequences from a set of constituent symbol sequences,

to receive two or more of the symbol sequences from a set of constituent symbol sequences, the two or more symbol sequences together identifying a selected radio link, and

to identify the selected radio link based on the received two or more symbol sequences and the obtained radio link reporting model,

wherein the symbol sequences in the set of constituent symbol sequences have been selected such that the correlation between one symbol sequence in the set and any other symbol sequence in the set, is below a threshold.