Method and apparatus for triggering a ranked transmission
A method and apparatus are provided for providing improved spectrum efficiency by triggering a ranked transmission. In this regard, a method is provided that includes causing a configuration message to be transmitted to a mobile terminal, wherein the configuration message provides interpretation information for a frequency hopping flag bit. The method also includes determining a rank for a transmission. The method may include setting a rank indication in the frequency hopping flag bit of a downlink control message based on the determined rank of the transmission.
1. A method comprising:
causing, with circuitry, a configuration message to be transmitted to a mobile terminal, the configuration message including interpretation information that repurposes a frequency hopping flag bit as a rank indicator to indicate only rank-1 or rank-2 when the mobile terminal does not use frequency hopping when transmitting a transmission;
determining, with the circuitry, a rank for the transmission; and
using, by the circuitry, the repurposed frequency hopping flag bit of a downlink control message to indicate the determined rank for the transmission.
2. The method according to claim 1 , wherein causing a configuration message to be transmitted includes providing trigger information for rank-2 Uplink Control Information-only Physical Uplink Shared Channel (PUSCH) transmission.
3. The method according to claim 1 , further comprising initially determining whether the mobile terminal will use frequency hopping in an Uplink Control Information-only PUSCH transmission.
4. The method according to claim 1 , wherein determining a rank includes determining a rank for the transmission based on an uplink channel status.
5. The method according to claim 1 , further comprising receiving, with the circuitry, the transmission from the mobile terminal, the transmission being encoded using a predetermined precoder.
6. The method according to claim 1 , wherein the determining of the rank for the transmission includes determining whether the transmission will use at least one of the rank-1 and the rank-2 for the Uplink Control Information-only PUSCH transmission.
7. The method according to claim 1 , wherein the configuration is a downlink control information (DCI) format 0 message.
8. The method according to claim 5 , wherein the predetermined precoder is used when the transmission is a rank-2 Uplink Control Information-only PUSCH transmission.
9. An apparatus comprising:
circuitry configured to
cause a configuration message to be transmitted to a mobile terminal, the configuration message including interpretation information that repurposes a frequency hopping bit as a rank indicator to indicate only rank-1 or rank-2 when the mobile terminal does not use frequency hopping when transmitting a transmission;
determine a rank for the transmission from a mobile terminal; and
use the repurposed frequency hopping bit of a downlink control message to indicate the determined rank for the transmission.
10. The apparatus according to claim 9 , wherein the circuitry is further configured to provide trigger information for a rank-2 Uplink Control Information-only Physical Uplink Shared Channel (PUSCH) transmission.
11. The apparatus according to claim 9 , wherein the circuitry is further configured to initially determine whether the mobile terminal will use frequency hopping in an Uplink Information-only PUSCH transmission.
12. The apparatus according to claim 9 , wherein the circuitry is further configured to determine a rank for the transmission based on an uplink channel status.
13. The apparatus according to claim 9 , wherein the circuitry is further configured to receive the transmission from the mobile terminal, the transmission being encoded using a predetermined precoder.
14. The apparatus according to claim 9 , wherein the circuitry is further configured to determine whether the transmission will use at least one of the rank-1 and the rank-2 for the Uplink Control Information-only PUSCH transmission.
15. The apparatus according to claim 9 , wherein the configuration message is a downlink control information (DCI) format 0 message.
16. An apparatus comprising:
circuitry configured to
receive a configuration message including interpretation information that repurposes a frequency hopping flag bit as a rank indicator to indicate only rank-1 or rank-2 when the apparatus does not use frequency hopping when transmitting a transmission;
determine a rank indication using the repurposed frequency hopping flag bit of a downlink control message; and
cause transmission of the transmission based on the determined rank indication.
17. The apparatus according to claim 16 , wherein the circuitry is further configured to cause a rank-2 Uplink Control Information-only Physical Uplink Shared Channel (PUSCH) transmission to be triggered.
18. The apparatus according to claim 16 , wherein the circuitry is further configured to determine a precoder when the transmission is a rank-2 Uplink Control Information-only PUSCH transmission.
19. The apparatus according to claim 16 , wherein the circuitry is further configured to determine whether the transmission will use at least one of the rank-1 and the rank-2 for the Uplink Control Information-only PUSCH transmission.
20. The apparatus according to claim 16 , wherein the configuration message is a downlink control information (DCI) format 0 message.