Telecommunications apparatus and methods

1. A method of operating a first entity in a wireless telecommunications system comprising the first entity and a second entity, wherein the method comprises:

starting to transmit a series of repeat transmissions to the second entity using transmission resources according to an initial arrangement;

establishing before the transmission of the series of repeat transmissions to the second entity is complete that, based on radio channel conditions of the initial arrangement falling below an acceptable threshold quality, a modified arrangement of transmission resources from within a time and frequency transmission resource grid is used for transmitting at least some of the remaining repeat transmissions; and

starting to transmit the at least some remaining repeat transmissions to the second entity using transmission resources in accordance with the modified arrangement.

2. The method of claim 1 , wherein the initial arrangement includes transmissions on one or more frequencies which are not used for transmissions in accordance with the modified arrangement.

3. The method of claim 1 , wherein the modified arrangement includes transmissions on one or more frequencies which are not used for transmissions in accordance with the initial arrangement.

4. The method of claim 1 , wherein the initial arrangement includes transmissions in time slots which are not used for transmissions in accordance with the modified arrangement.

5. The method of claim 1 , wherein the modified arrangement includes transmissions in time slots which are not used for transmissions in accordance with the initial arrangement.

6. The method of claim 1 , wherein the modified arrangement includes transmissions on only one frequency.

7. The method of claim 1 , wherein the initial arrangement includes transmissions on only one frequency.

8. The method of claim 1 , wherein using the modified arrangement to transmit at least some of the repeat transmission results in the series of repeat transmissions transmitted by the first entity to the second entity comprising a different number of repeat transmissions than would be the case of the complete series of repeat transmissions had been transmitted in accordance with the initial arrangement.

9. The method of claim 1 , wherein establishing that a modified arrangement of transmission resources should be used for transmitting at least some of the remaining repeat transmissions comprises receiving arrangement change indicator signalling from the second entity which indicates that a modified arrangement of transmission resources should be used for transmitting at least some of the remaining repeat transmissions.

10. The method of claim 9 , wherein the arrangement change indicator signalling further comprises an indication of the modified arrangement of transmission resources.

11. The method of claim 9 , wherein the arrangement change indicator signalling comprises a predefined signature sequence.

12. The method of claim 9 , wherein the arrangement change indicator signalling is received in association with downlink control information received from the second entity.

13. The method of claim 12 , wherein the downlink control information comprises acknowledgement signalling received in relation to a transmission of the series of repeat transmissions, or wherein the downlink control information comprises allocation signalling scheduling a retransmission of the data.

14. The method of claim 9 , wherein the arrangement change indicator signalling is received on a dedicated physical channel dedicated for arrangement change indicator signalling.

15. The method of claim 9 , wherein the initial arrangement includes a period of time dun rig which the first entity does not transmit repeat transmissions of the data to the second entity and the arrangement change indicator signalling is received from the second entity during this period.

16. The method of claim 1 , further comprising establishing a period of time during which to transmit the at least some remaining repeat transmissions to the second entity using transmission resources in accordance with the modified arrangement, and after that period of time, starting to transmit at least some of any still remaining repeat transmissions using transmission resources according to the initial arrangement.

17. The method of claim 1 , further comprising establishing before the transmission of the series of repeat transmissions to the second entity is complete that a further modified arrangement of transmission resources from within the time and frequency transmission resource grid should be used for transmitting at least some of the remaining repeat transmissions; and starting to transmit the at least some remaining repeat transmissions to the second entity using transmission resources in accordance with the further modified arrangement.

18. The method of claim 17 , when the further modified arrangement matches the initial arrangement.

19. A method of operating a second entity in a wireless telecommunications system comprising the second entity and a first entity, wherein the method comprises:

starting to received series of repeat transmissions from the first entity using transmission resources according to an initial arrangement;

establishing before the transmission of the series of repeat transmissions by the first entity is complete that, based on radio channel conditions of the initial arrangement falling below an acceptable threshold quality, a modified arrangement of transmission resources from within a time and frequency transmission resource grid is used by the first entity for transmitting at least some of the remaining repeat transmissions; and

starting to receive the at least some remaining repeat transmissions from the first entity using transmission resources in accordance with the modified arrangement.

20. The method of claim 19 , wherein establishing that a modified arrangement of transmission resources should be used by the first entity for transmitting at least some of the remaining repeat transmissions is based on measurements of radio channel conditions associated with the transmissions from the first entity using transmission resources according to the initial arrangement.