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1. (WO2018007670) ADAPTIVE AUTOMATIC REPEAT REQUEST
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

CLAIMS:

1. An apparatus comprising at least one processing core, at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processing core, cause the apparatus at least to:

- participate in communication of data, the communication employing a first automatic repeat request, ARQ, layer and a second ARQ layer, the first ARQ layer being arranged to operate with a smaller delay than the second ARQ layer, the second ARQ layer being arranged to correct errors occurring in the first ARQ layer;

- process information concerning a segmentation of the first ARQ layer;

- select a segment size of the second ARQ layer at least partly in dependence of the information, and

- modify the segment size of the second ARQ layer less frequently than once each transmission time interval.

2. The apparatus according to claim 1, wherein the first ARQ layer comprises a hybrid ARQ layer.

3. The apparatus according to claim 1 or 2, wherein the apparatus is configured to modify a segment size of the first ARQ layer more frequently than the segment size of the second ARQ layer.

4. The apparatus according to any of claims 1 - 3, wherein the apparatus is configured to select the segment size of the second ARQ layer at least partly in dependence of both the information and further information.

5. The apparatus according to claim 4, wherein the further information comprises at least one received status packet data unit.

6. The apparatus according to any preceding claim, wherein the apparatus is configured to employ different segment sizes for the second ARQ layer for different connection legs in a multi-connectivity session.

7. The apparatus according to any preceding claim, wherein the apparatus comprises or is comprised in a user equipment and the apparatus is configured to select the segment size of the second ARQ layer for the uplink direction.

8. The apparatus according to claim 7, wherein the apparatus is configured to receive the information from at least one of the following: a base station, a radio access point and a central server.

9. The apparatus according to any of claims 1 - 6, wherein the apparatus comprises or is comprised in a node that does not contain the first ARQ layer, and the apparatus is configured to select the segment size of the second ARQ layer for the downlink direction.

10. The apparatus according to claim 9, wherein the apparatus is configured to receive the information from a base station or access point.

11. The apparatus according to any of claims 9 - 10, wherein the information comprises at least one of the following: a segment size recommendation, a transport block size averaged over more than one transmission time interval, a smallest transport block size used during a time interval, a current radio channel condition and a predicted radio channel condition.

12. A method comprising:

- participating in communication of data, the communication employing a first automatic repeat request, ARQ, layer and a second ARQ layer, the first ARQ layer being arranged to operate with a smaller delay than the second ARQ layer, the second ARQ layer being arranged to correct errors occurring in the first ARQ layer; - processing information concerning a segmentation of the first ARQ layer;

- selecting a segment size of the second ARQ layer at least partly in dependence of the information, and

- modifying the segment size of the second ARQ layer less frequently than once each transmission time interval.

13. The method according to claim 12, wherein the first ARQ layer comprises a hybrid ARQ layer.

14. The method according to claim 12 or 13, wherein a segment size of the first ARQ layer is modified more frequently than the segment size of the second ARQ layer.

15. The method according to any of claims 12 - 14, wherein the segment size of the second ARQ layer is selected at least partly in dependence of both the information and further information.

16. The method according to claim 15, wherein the further information comprises at least one received status packet data unit.

17. The method according to any of claims 12 - 16, further comprising employing different segment sizes for the second ARQ layer for different connection legs in a multi-connectivity session.

18. The method according to any of claims 12 - 17, wherein the method is performed in a user equipment, and the method comprises selecting, in the user equipment, the segment size of the second ARQ layer for the uplink direction.

19. The method according to claim 18, further comprising receiving the information, in the user equipment, from at least one of the following: a base station, a radio access point and a central server.

20. The method according to any of claims 12 - 17, wherein the method is performed in a node that does not contain the first ARQ layer, and the method comprises selecting, in the node, the segment size of the second ARQ layer for the downlink direction.

21. The method according to claim 20, further comprising receiving the information from a base station or access point.

22. The method according to any of claims 20 - 21, wherein the information comprises at least one of the following: a segment size recommendation, a transport block size averaged over more than one transmission time interval, a smallest transport block size used during a time interval, a current radio channel condition and a predicted radio channel condition.

23. An apparatus comprising at least one processing core, at least one memory including computer program code, the at least one memory and the computer program code being configured to, with the at least one processing core, cause the apparatus at least to:

- participate in communication of data, the communication employing a first automatic repeat request, ARQ, layer and a second ARQ layer, the first ARQ layer being arranged to operate with a smaller delay than the second ARQ layer, the second ARQ layer being arranged to correct errors occurring in the first ARQ layer;

- prepare a recommendation concerning a segmentation of the second ARQ layer, and

- cause transmission of the recommendation to a node comprised in a radio access network.

24. The apparatus according to claim 23, wherein the apparatus is configured to transmit retransmissions in accordance with the first ARQ layer.

25. The apparatus according to claim 23 or 24, wherein the apparatus is configured to include in the recommendation information concerning at least one of the following: a transport block size averaged over more than one transmission time interval, a smallest transport block size used during a time interval, a current radio channel condition and a predicted radio channel condition.

26. A method, comprising:

- participating in communication of data, the communication employing a first automatic repeat request, ARQ, layer and a second ARQ layer, the first ARQ layer being arranged to operate with a smaller delay than the second ARQ layer, the second ARQ layer being arranged to correct errors occurring in the first ARQ layer; - preparing a recommendation concerning a segmentation of the second ARQ layer, and

- causing transmission of the recommendation to a node comprised in a radio access network.

27. An apparatus comprising:

- means for participating in communication of data, the communication employing a first automatic repeat request, ARQ, layer and a second ARQ layer, the first ARQ layer being arranged to operate with a smaller delay than the second ARQ layer, the second ARQ layer being arranged to correct errors occurring in the first ARQ layer;

- means for processing information concerning a segmentation of the first ARQ layer;

- means for selecting a segment size of the second ARQ layer at least partly in dependence of the information, and

- means for modifying the segment size of the second ARQ layer less frequently than once each transmission time interval.

28. An apparatus according to claim 27, further comprising means for performing the method according to any of claims 14-24 or 26.

29. A non-transitory computer readable medium having stored thereon a set of computer readable instructions that, when executed by at least one processor, cause an apparatus to at least:

- participate in communication of data, the communication employing a first automatic repeat request, ARQ, layer and a second ARQ layer, the first ARQ layer being arranged to operate with a smaller delay than the second ARQ layer, the second ARQ layer being arranged to correct errors occurring in the first ARQ layer;

- process information concerning a segmentation of the first ARQ layer;

- select a segment size of the second ARQ layer at least partly in dependence of the information, and

- modify the segment size of the second ARQ layer less frequently than once each transmission time interval.

30. A computer program configured to cause a method in accordance with at least one of claims 12 - 22 or 26 to be performed.