Including in the uplink grant an indication of specific amount of CQI to be reported
The present invention relates to a method, user equipment and a base station adapted to handle channel state feedback reports in a more flexible way. More specifically, a channel state feedback procedure is provided which utilizes the resources available for transmission of channel state feedback more efficiently. This is achieved by including uplink grant availability into the channel state feedback reporting triggers used for determining when and how to send channel state feedback from a UE, i.e. a channel state feedback reporting request may be sent by a base station in an uplink grant to a UE comprising an indication of an expected amount of information to be returned.
1. A method in a base station comprising a scheduler for obtaining channel state feedback from a user equipment (UE), comprising the steps of:
determining if channel state feedback is required, and in case channel state feedback is required, also determining a channel state feedback type, out of a predefined set of channel state feedback types, said type defining a required amount of channel state feedback information,
generating an uplink grant comprising a transport format indicating said channel state feedback type, and
providing said generated uplink grant to the UE in order to receive the required amount of channel state feedback on the granted resource,
wherein said predefined set of types includes at least a type 1 and a type 2 transport format, and
wherein the type 2 transport format indicates a specific amount in the range of 95-100 percent of said resource to be used by said UE for transmitting said channel state feedback information.
2. A method according to claim 1 , wherein said amount represents a percentage of said granted resource.
3. A method according to claim 1 , wherein said channel state feedback comprises a channel quality indicator (CQI) report.
4. A method in a user equipment, UE, for providing channel state feedback from the UE to a base station, comprising the steps of:
determining whether the UE has received an uplink grant from the base station or not and in case the UE has received an uplink grant, determining an amount of channel state feedback information required by the base station via a transport format of said grant, said transport format indicating one out of a predefined set of channel state feedback types, said type defining the required amount of channel state feedback information; and
transmitting said amount of channel state feedback information to the base station on the granted resource, or no channel state feedback information in case the UE has not received an uplink grant,
wherein said predefined set of types includes at least a type 1 and a type 2 transport format, and
wherein the type 2 transport format indicates a specific amount in the ranqe of 95-100 percent of said resource to be used by said UE for transmitting said channel state feedback information.
5. A method according to claim 4 , wherein said amount represents a percentage of said granted resource.
6. A method according to claim 4 , wherein said channel state feedback comprises a channel quality indicator (CQI) report.
7. A base station comprising a scheduler for obtaining channel state feedback from a user equipment, UE, wherein
a generating unit adapted to determine whether channel state feedback is required or not and adapted to select one out of a predefined set of channel state feedback types, said type defining a required amount of channel state feedback information, and to generate an uplink grant comprising a transport format indicating said type in case channel state feedback is required,
a transmitting unit configured to transmit the uplink grant to the UE, and
a receiving unit configured to receive channel state feedback in response to the transmitted uplink grant,
wherein said predefined set of types includes at least a type 1 and a type 2 transport format, and
wherein the type 2 transport format is adapted to indicate a specific amount in the range of 95-100 percent of said resource to be used by said UE for transmitting said channel state feedback information.
8. A base station according to claim 7 , wherein said amount represents a percentage of said granted resource.
9. A base station according to claim 7 , wherein said channel state feedback comprises a channel quality indicator (CQI) report.
10. A User Equipment, UE, for providing channel state feedback from the UE to a base station comprising:
a determining unit for determining whether the UE has received an uplink grant from the base station or not and for determining a transport format of said grant indicating one of a predefined set of channel state feedback types, said type defining an amount of channel state feedback information required by the base station, and
a transmitting unit for transmitting said amount of channel state feedback information to the base station on the granted resource in case the UE has received an uplink grant, or no channel state feedback information in case the UE has not received an uplink grant,
wherein said predefined set of types includes at least a type 1 and a type 2 transport format, and
wherein the type 2 transport format is adapted to indicate a specific amount in the range of 95-100 percent of said resource to be used by said UE for transmitting said channel state feedback information.
11. A User Equipment according to claim 10 , wherein said amount represents a percentage of said granted resource.
12. A User Equipment according to claim 10 , wherein said channel state feedback comprises a channel quality indicator (CQI) report.