Logical channel prioritization procedure for generating multiple uplink transport blocks
The invention relates to methods for scheduling of uplink transmission and generating transport blocks according to multiple received uplink assignments Furthermore, the invention is also related to the implementation of these methods in hardware and software. To propose strategies for generating plural transport blocks within a given time constraint, the invention introduces prioritization of the uplink assignments, so that multiple uplink assignments can be ranked in the mobile terminal in a priority order. The prioritization of the uplink assignments is used to determine the order in which the individual transport blocks corresponding to the uplink assignments are filled, respectively how the data of different logical channels is multiplexed to the transport blocks for transmission in the uplink. Another aspect of the invention is to suggest joint logical channel procedures that operate on virtual transport blocks accumulated from the received uplink assignments. One or more such joint logical channel procedure can be performed in parallel.
1. A method for controlling transmit powers for transmissions of transport blocks on uplink component carriers of a mobile communication system in a power limited situation, the method comprising the following steps performed by a mobile terminal:
receiving uplink resource assignments that schedule transmissions of the transport blocks on the uplink component carriers within a transmission time interval, wherein the uplink resource assignments have a priority order,
determining for each transmission of a respective one of the transport blocks, a transmit power required for transmitting the respective transport block according to its corresponding uplink resource assignment,
reducing the determined transmit power for each transmission of a respective one of the transport blocks according to the priority of the transport block given by the priority orders, wherein the lower the priority of an uplink resource assignment, the larger the power reduction applied to the transmit power for the transmission of the transport block required by its corresponding uplink resource assignment, and the higher the priority of an uplink resource assignment, the smaller the power reduction applied to the transmit power for the transmission of the transport block required by its corresponding uplink resource assignment, and
transmitting the transport blocks on the uplink component carriers within the transmission time interval, wherein each transport block is transmitted using the reduced transmit power.
2. The method according to claim 1 , further comprising the step of determining for the transmission of each transport block i of the transport blocks, a scaling factor s i , where s i ε[0, . . . , 1], wherein the determination of the respective scaling factor s i for each of the transport blocks is based on the priority of the resource assignment corresponding to the respective transport block i as given by the priority order,
wherein reducing the transmit power comprises scaling for each transmission of a respective one of the transport blocks the determined transmit power according to the priority of the transport block given by the priority order.
3. The method according to claim 2 , wherein the scaling factors s i for the transport blocks are determined such that the sum of the required transmit powers scaled by the scaling factors s i for the transport blocks is smaller or equal to a maximum transmit power available to the mobile terminal for transmitting the transport blocks.
4. The method according to claim 1 , further comprising the step of generating the transport blocks for transmission, wherein the data of different logical channels is multiplexed to the transport blocks according to the priority order of their corresponding uplink resource assignments.
5. The method according to claim 1 , wherein the priority order of the uplink resource assignments is determined based on the priority indicated for each uplink resource assignment.
6. The method according to claim 1 , wherein each uplink component carrier is assigned a carrier indicator and the priority order of the uplink resource assignments is determined by the carrier indicators of the component carriers scheduled by the uplink resource assignments.
7. The method according to claim 1 , wherein each uplink resource assignment is allocating radio resources on one of plural component carriers and the component carriers are assigned respective priorities, wherein the priority order of the uplink resource assignments is determined according to the priorities of the component carriers on which resources are allocated by the uplink resource assignments.
8. The method according to claim 7 , wherein the priority order of the component carriers is signaled by means of higher layer signaling to the mobile terminal.
9. The method according to claim 1 , wherein the priority order of the uplink resource assignments is given by their transmission timing on the control channel.
10. The method according to claim 1 , wherein the priority of each uplink resource assignment is determined by the type of the component carrier to which it pertains, and the priority order is determined based on the priorities of the uplink resource assignments.
11. The method according to claim 1 , wherein the priority order of the uplink resource assignments is determined by the mobile terminal based on at least one parameter included in each uplink resource assignment, wherein the at least one parameter includes at least one of:
a modulation and coding scheme level indicated in a respective one of the uplink resource assignments;
a transport block size indicated by a respective uplink resource assignments; and
a scheduling mode indicated by a respective uplink resource assignments.
12. A mobile terminal for controlling transmit powers of transmissions of transport blocks on uplink component carriers of a mobile communication system in a power limited situation, the mobile terminal comprising:
a receiver for receiving uplink resource assignments that schedule transmissions of the transport blocks on the uplink component carriers within a transmission time interval, wherein the uplink resource assignments have a priority order,
a processor for determining for each transmission of a respective one of the transport blocks, a transmit power required for transmitting the respective transport block according to its corresponding uplink resource assignment,
a power controller for reducing the determined transmit power for each transmission of a respective one of the transport blocks according to the priority of the transport block given by the priority order, wherein the power controller is adapted to reduce the required transmit power for each transmission of a respective one of the transport blocks inversely proportional to the priority of the resource assignment of a respective transport block as given by the priority order, and
a transmitter for transmitting the transport blocks on the uplink component carriers within the transmission time interval, wherein each transport block is transmitted using the reduced transmit power.
13. The mobile terminal according to claim 12 , wherein the processor is adapted to determine for the transmission of each transport block I of the transport blocks, a scaling factor s i where s i ε[0, . . . , 1], wherein the determination of the respective scaling factor s i for each of the transport blocks is based on the priority of the resource assignment corresponding to the respective transport block i as given by the priority order, and
wherein the power controller is adapted to scale for each transmission of a respective one of the transport blocks the determined transmit power according to the priority of the transport block given by the priority order.
14. The mobile terminal according to claim 12 ,
wherein the receiver is adapted to receive the uplink resource assignments on a control channel, and wherein the uplink resource assignments are allocating respective radio resources for uplink transmission to the mobile terminal, and
wherein the mobile terminal further comprises a transport block generator for generating respective transport blocks for transmission on the allocated respective radio resources, wherein the data of different logical channels is multiplexed to the transport blocks according to the priority order of their corresponding uplink resource assignment.
15. The mobile terminal according to claim 12 , wherein the transmitter is configured to transmit generated transport blocks within a transmission time interval on plural component carriers.
16. The mobile terminal according to claim 12 , wherein the transmitter is adapted to transmit the transport blocks via a shared uplink channel on radio resources allocated by the resource assignments.
17. The mobile terminal according to claim 12 , wherein the receiver is adapted to receive information on the priority order of the uplink resource assignments via MAC control signaling or radio resource signaling.