Granting resources for uplink transmissions

1. A method, comprising:

recovering a single uplink grant from a downlink transmission by a network node, wherein said single uplink grant identifies one combination from a set of predetermined combinations of one or more transmission time intervals and one or more uplink reference signal transmissions, the set of predetermined combinations including at least one combination of two or more transmission time intervals and one or more uplink reference signal transmissions; and

controlling data transmissions in said one or more transmission time intervals of the identified combination, scheduled by the single uplink grant,

wherein said set of predetermined combinations includes one or more of the following:

one or more combinations in which an uplink reference signal occupies a first symbol after a first scheduled transmission time interval, and any additional transmission time intervals follow said uplink reference signal; or

one or more combinations in which uplink reference signal transmissions occupy both a first scheduled symbol and a predetermined symbol in each of the one or more combinations.

2. The method according to claim 1 , wherein the identified combination comprises one transmission time interval for one uplink data transmission by a communication device, and one or more uplink reference signal transmissions.

3. The method according to claim 1 , wherein said set of predetermined combinations further includes:

one or more combinations in which a single uplink reference signal occupies the first scheduled symbol, and one or more transmission time intervals occupy a contiguous set of symbols immediately after the uplink reference signal transmissions.

4. The method according to claim 1 , wherein said set of predetermined combinations comprises at least one of:

(i) a subset of combinations in which one or more transmission time intervals and one or more uplink reference signal transmissions occupy a contiguous series of symbols ending with the last symbol of a sub-frame; or

(ii) a subset of combinations in which one or more transmission time intervals and one or more uplink reference signal transmissions occupy a contiguous series of symbols ending with the last symbol of the first half of a sub-frame.

5. The method according to claim 1 , wherein said single uplink grant indicates at least one of:

(i) a number of uplink transmission time intervals for use by a communication device,

(ii) the first symbol of a contiguous set of symbols occupied by one or more uplink transmission time intervals and the one or more uplink reference signal transmissions, or

(iii) a location of the one or more uplink reference signal transmissions within said contiguous set of symbols.

6. The method according to claim 1 , wherein said one or more uplink reference signals are uplink demodulation reference signals.

7. An apparatus comprising: a processor and memory including computer program code, wherein the memory and computer program code are configured to, with the processor, cause the apparatus at least to:

control downlink transmission of a single uplink grant for one or more uplink data transmissions by a communication device, wherein said single uplink grant identifies one combination from a set of predetermined combinations of one or more transmission time intervals and one or more uplink reference signal transmissions, the set of predetermined combinations including at least one combination of two or more transmission time intervals and one or more uplink reference signal transmissions; and

use said one or more uplink reference signal transmissions of the identified combination to assist the recovery of data from the one or more uplink radio data transmissions by said communication device in the one or more transmission time intervals of the identified combination, scheduled by the single uplink grant,

wherein said set of predetermined combinations includes one or more of the following:

one or more combinations in which an uplink reference signal occupies a first symbol after a first scheduled transmission time interval, and any additional transmission time intervals follow said uplink reference signal; or

one or more combinations in which uplink reference signal transmissions occupy both a first scheduled symbol and a predetermined symbol in each of the one or more combinations.

8. The apparatus according to claim 7 , wherein the identified combination comprises a combination of one uplink transmission time interval for one uplink data transmissions by the communication device, and one or more uplink reference signal transmissions.

9. The apparatus according to claim 7 , wherein said set of predetermined combinations further includes:

one or more combinations in which a single uplink reference signal occupies the first scheduled symbol, and one or more transmission time intervals occupy a contiguous set of symbols immediately after the uplink reference signal transmissions.

10. The apparatus according to claim 7 , wherein a number of uplink reference signal transmissions is smaller than or equal to a number of transmission time intervals.

11. The apparatus according to claim 7 , wherein said set of predetermined combinations comprises at least one of:

(i) a subset of combinations in which one or more transmission time intervals and one or more uplink reference signal transmissions occupy a contiguous series of symbols ending with the last symbol of a sub-frame; or

(ii) a subset of combinations in which one or more transmission time intervals and one or more uplink reference signal transmissions occupy a contiguous series of symbols ending with the last symbol of the first half of a sub-frame.

12. The apparatus according to claim 7 , wherein said single uplink grant indicates at least one of:

(i) a number of one or more uplink transmission time intervals for use by the communication device,

(ii) the first symbol of a contiguous set of symbols occupied by one or more uplink transmission time intervals and the one or more uplink reference signal transmissions, or

(iii) a location of the one or more uplink reference signal transmissions within said contiguous set of symbols.

13. The apparatus according to claim 7 , wherein said one or more uplink reference signals are uplink demodulation reference signals.

14. An apparatus comprising: a processor and memory including computer program code, wherein the memory and computer program code are configured to, with the processor, cause the apparatus at least to:

recover a single uplink grant from a downlink transmission by a network node, wherein said single uplink grant identifies one combination from a set of predetermined combinations of one or more transmission time intervals and one or more uplink reference signal transmissions, the set of predetermined combinations including at least one combination of two or more transmission time intervals and one or more uplink reference signal transmissions; and

control data transmissions in said one or more transmission time intervals of the identified combination, scheduled by the single uplink grant,

wherein said set of predetermined combinations includes one or more of the following:

one or more combinations in which an uplink reference signal occupies a first symbol after a first scheduled transmission time interval, and any additional transmission time intervals follow said uplink reference signal; or

one or more combinations in which uplink reference signal transmissions occupy both a first scheduled symbol and a predetermined symbol in each of the one or more combinations.

15. The apparatus according to claim 14 , wherein the identified combination comprises one transmission time interval for one uplink data transmission by the apparatus, and one or more uplink reference signal transmissions.

16. The apparatus according to claim 14 , wherein said set of predetermined combinations further includes:

one or more combinations in which a single uplink reference signal occupies the first scheduled symbol, and one or more transmission time intervals occupy a contiguous set of symbols immediately after the uplink reference signal transmissions.

17. The apparatus according to claim 14 , wherein a number of uplink reference signal transmissions is smaller than, or equal to, a number of transmission time intervals.

18. The apparatus according to claim 14 , wherein said set of predetermined combinations comprises at least one of:

(i) a subset of combinations in which one or more transmission time intervals and one or more uplink reference signal transmissions occupy a contiguous series of symbols ending with the last symbol of a sub-frame; or

(ii) a subset of combinations in which one or more transmission time intervals and one or more uplink reference signal transmissions occupy a contiguous series of symbols ending with the last symbol of the first half of a sub-frame.

19. The apparatus according to claim 14 , wherein said single uplink grant indicates at least one of:

(i) a number of uplink transmission time intervals for use by the apparatus,

(ii) the first symbol of a contiguous set of symbols occupied by one or more uplink transmission time intervals and the one or more uplink reference signal transmissions, or

(iii) a location of the one or more uplink reference signal transmissions within said contiguous set of symbols.

20. The apparatus according to claim 14 , wherein said one or more uplink reference signals are uplink demodulation reference signals.