Dynamic resource allocation, scheduling and signaling for variable data rate service in LTE
A method and apparatus are provided for dynamic resource allocation, scheduling and signaling for variable data real time services (RTS) in long term evolution (LTE) systems. Preferably, changes in data rate for uplink RTS traffic are reported to an evolved Node B (eNB) by a UE using layer 1, 2 or 3 signaling. The eNB dynamically allocates physical resources in response to a change in data rate by adding or removing radio blocks currently assigned to the data flow, and the eNB signals the new resource assignment to the UE. In an alternate embodiment, tables stored at the eNB and the UE describe mappings of RTS data rates to physical resources under certain channel conditions, such that the UE uses the table to locally assign physical resources according to changes in UL data rates. Additionally, a method and apparatus for high level configuration of RTS data flows is also presented.
1. A wireless transmit/receive unit (WTRU) comprising:
a receiver; and
a transmitter, wherein
the receiver is configured to receive layer 3 (L3) control information, wherein the L3 control information indicates, for an allocation of resources, at least a first frequency domain resource allocation, periodicity information, duration information, sequence information, and repetition information;
the transmitter is configured to periodically transmit, based on the periodicity information, uplink data according to the L3 control information;
the receiver is configured to receive layer 1/layer 2 (L1/L2) control information, after at least one uplink data transmission according to the L3 control information, wherein the L1/L2 control information indicates at least a second frequency domain resource allocation;
the transmitter is configured to transmit uplink data according to the L1/L2 control information; and
the transmitter is configured to transmit at least one uplink data transmission according to the L3 control information, after the transmission of the uplink data according to the L1/L2 control information.
2. The WTRU of claim 1 , wherein the L3 control information is radio resource control (RRC) control information.
3. The WTRU of claim 1 , wherein the L3 control information further indicates a time domain resource allocation.
4. The WTRU of claim 1 , wherein the L3 control information further indicates a frequency hopping pattern.
5. The WTRU of claim 1 , wherein the L3 control information further indicates at least a number of resource blocks assigned to the WTRU.
6. The WTRU of claim 5 , wherein the number of resource blocks indicates a number of sub-bands assigned to the WTRU.
7. The WTRU of claim 1 , wherein the L3 control information is received in an orthogonal frequency division multiple access (OFDMA) format.
8. A method performed by a wireless transmit/receive unit (WTRU), the method comprising:
receiving layer 3 (L3) control information, wherein the L3 control information indicates, for an allocation of resources, at least a first frequency domain resource allocation, periodicity information, duration information, sequence information, and repetition information;
periodically transmitting, based on the periodicity information, uplink data according to the L3 control information;
receiving layer 1/layer 2 (L1/L2) control information, after at least one uplink data transmission according to the L3 control information, wherein the L1/L2 control information indicates at least a second frequency domain resource allocation;
transmitting uplink data according to the L1/L2 control information; and
transmitting at least one uplink data transmission according to the L3 control information, after the transmission of the uplink data according to the L1/L2 control information.
9. The method of claim 8 , wherein the L3 control information is radio resource control (RRC) control information.
10. The method of claim 8 , wherein the L3 control information further indicates a time domain resource allocation.
11. The method of claim 8 , wherein the L3 control information further indicates a frequency hopping pattern.
12. The method of claim 8 , wherein the L3 control information further indicates at least a number of resource blocks assigned to the WTRU.
13. The method of claim 12 , wherein the number of resource blocks indicates a number of sub-bands assigned to the WTRU.
14. The method of claim 8 , wherein the L3 control information is received in an orthogonal frequency division multiple access (OFDMA) format.