Uplink grant detection for partial time division multiplexing mode

1. An apparatus, comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured, with the at least one processor, to cause the apparatus at least to transmit an Enhanced Absolute Grant Channel (E-AGCH) message to at least one user equipment, wherein the E-AGCH message comprises an indication of one of a first type grant or a second type grant indicating whether a grant is susceptible to grant detection, wherein the first type of grant is considered susceptible to grant detection, and wherein the second type of grant is considered not susceptible to grant detection, wherein, when the E-AGCH message comprises the indication of the first type of grant and the at least one user equipment detects an E-AGCH transmission to another user equipment, the at least one user equipment changes the grant to zero grant or inactive grant.

2. The apparatus according to claim 1 , wherein, when the E-AGCH message comprises the indication of the second type of grant, the at least one user equipment maintains the grant even when the E-AGCH is used to provide grants to other user equipment.

3. The apparatus according to claim 1 , wherein the at least one user equipment is configured with a first Enhanced Radio Network Temporary Identity (E-RNTI) and a second Enhanced Radio Network Temporary Identity (E-RNTI).

4. The apparatus according to claim 3 , wherein at least one of: the indication of the first type of grant comprises the first E-RNTI used as a cyclic redundancy check mask indicating the grant is susceptible to grant detection; and the indication of the second type of grant comprises the second E-RNTI used as a cyclic redundancy check mask indicating the grant is not susceptible to grant detection.

5. The apparatus according to claim 1 , wherein the indication comprises a E-AGCH scope bit indicating the grant is susceptible to grant detection or not susceptible to grant detection.

6. A method, comprising: receiving, by a user equipment, an Enhanced Absolute Grant Channel (E-AGCH) message comprising an indication of one of a first type grant or a second type grant indicating whether a grant is susceptible to grant detection, wherein the first type of grant is considered susceptible to grant detection, wherein the second type of grant is considered not susceptible to grant detection, and wherein, when the E-AGCH message comprises the indication of the first type of grant and the user equipment detects an E-AGCH transmission to another user equipment, changing, by the user equipment, the grant to zero grant or inactive grant.

7. The method according to claim 6 , wherein, when the E-AGCH message comprises the indication of the second type of grant, maintaining the grant even when the E-AGCH is used to provide grants to other user equipment.

8. The method according to claim 6 , wherein the user equipment is configured with a first Enhanced Radio Network Temporary Identity (E-RNTI) and a second Enhanced Radio Network Temporary Identity.

9. The method according to claim 8 , wherein at least one of: the indication of the first type of grant comprises the first E-RNTI used as a cyclic redundancy check mask to indicate the grant is susceptible to grant detection; and the indication of the second type of grant comprises the second E-RNTI used as a cyclic redundancy check mask to indicate the grant is not susceptible to grant detection.

10. The method according to claim 6 , wherein the indication comprises a E-AGCH scope bit indicating the grant is susceptible to grant detection or not susceptible to grant detection.

11. The method according to claim 6 , further comprising tagging the zero grant with an identifier for identifying a source of the zero grant.

12. An apparatus, comprising: at least one processor; and at least one memory including computer program code, the at least one memory and computer program code configured, with the at least one processor, to cause the apparatus at least to receive an Enhanced Absolute Grant Channel (E-AGCH) message comprising an indication of one of a first type grant or a second type grant indicating whether a grant is susceptible to grant detection, wherein the first type of grant is considered susceptible to grant detection, wherein the second type of grant is considered not susceptible to grant detection, and wherein, when the E-AGCH message comprises the indication of the first type of grant and the apparatus detects an E-AGCH transmission to another user equipment, the apparatus is further caused to at least change the grant to zero grant or inactive grant.

13. The apparatus according to claim 12 , wherein, when the E-AGCH message comprises the indication of the second type of grant, the apparatus is further caused to at least maintain the grant even when the E-AGCH is used to provide grants to other user equipment.

14. The apparatus according to claim 12 , wherein the apparatus is configured with a first Enhanced Radio Network Temporary Identity (E-RNTI) and a second Enhanced Radio Network Temporary Identity.

15. The apparatus according to claim 12 , wherein at least one of: the indication of the first type of grant comprises the first E-RNTI used as a cyclic redundancy check mask indicating the grant is susceptible to grant detection; and the indication of the second type of grant comprises the second E-RNTI used as a cyclic redundancy check mask indicating the grant is not susceptible to grant detection.

16. The apparatus according to claim 12 , wherein the indication comprises a E-AGCH scope bit indicating the grant is susceptible to grant detection or not susceptible to grant detection.

17. The apparatus according to claim 12 , further comprising tagging means for tagging the zero grant with an identifier for identifying a source of the zero grant.