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US 8,031,583 B2Granted
Method and apparatus for reducing round trip latency and overhead within a communication system
AssigneeMotorola Mobility LLC
InventorsBrian K. Classon, Kevin L. Baum, Amitava Ghosh, Robert T. Love, Vijay Nangia, Kenneth A. Stewart
Life of this patent
Estimating the term…
Abstract
During operation radio frames are divided into a plurality of subframes. Data is transmitted over the radio frames within a plurality of subframes, and having a subframe type selected from a plurality of subframe types. Each subframe type having a same time duration and being distinguished by having a differing number of OFDM symbols or a differing number of single carrier FDMA symbols.
Claims46
A method for transmitting data within a communication system, the method comprising the steps of:
- determining a carrier bandwidth from a set of two or more carrier bandwidths;
- receiving data to be transmitted over a radio frame, wherein the radio frame is comprised of a plurality of subframes;
- placing data within a subframe in the radio frame to produce a subframe of data, wherein the subframe of data comprises either a plurality of OFDM symbols or a plurality of single carrier FDMA symbols, at least two of the OFDM symbols or at least two of the single carrier FDMA symbols in the subframe having different symbol durations;
- wherein the radio frame and subframe have the same duration for each of the carrier bandwidths in the set of two or more carrier bandwidths, and
- wherein the OFDM symbols or single carrier FDMA symbols in the subframe comprise a plurality of subcarriers and wherein the plurality of symbols and subcarriers in the subframe are grouped into resource blocks such that the carrier bandwidth is divided into an integer number of resource blocks;
- wherein the at least two OFDM or single carrier FDMA symbols in each of the plurality of subframes differ in cyclic prefix duration by one sample duration corresponding to the smallest carrier bandwidth in the set of two or more carrier bandwidths, wherein the subframe duration of each of the plurality of subframes is a same duration;
- placing the data within resource blocks in the subframe;
- and
- transmitting the subframe of data over the radio frame and in the determined carrier bandwidth.
6 more elements
A method for transmitting data by a base station within a communication system, the method comprising the steps of:
- receiving data to be transmitted over a radio frame, wherein the radio frame is comprised of a plurality of subframes;
- placing data within a subframe in the radio frame to produce a subframe of data, wherein the subframe of data comprises either a plurality of OFDM symbols or a plurality of single carrier FDMA symbols, at least two of the OFDM symbols or at least two of the single carrier FDMA symbols in the subframe having different symbol durations;
- time multiplexing and placing a resource allocation control channel comprising a plurality of control OFDM/SC-FDMA symbols at the start of the subframe, wherein the resource allocation control contains at least downlink resource allocation, uplink resource allocation and acknowledgment control information for one or more remote units and wherein the downlink and uplink resource allocation allocates time/frequency resources to the one or more remote units and wherein the acknowledgement control information is HARQ ACK/NACK feedback information;
- placing within the subframe an indication of the location of the resource allocation control channel;
- transmitting the subframe of data including the resource allocation control channel over the radio frame;
- wherein the at least two OFDM or single carrier FDMA symbols in each of the plurality of subframes differ in cyclic prefix duration by one sample duration corresponding to the smallest carrier bandwidth in the set of two or more carrier bandwidths, wherein the subframe duration of the plurality of subframes is a same duration.
3 more elements
A method for transmitting data by a base station within a communication system, the method comprising the steps of:
- receiving data to be transmitted over a radio frame, wherein the radio frame is comprised of a plurality of subframes;
- placing data within a subframe in the radio frame to produce a subframe of data, wherein the subframe of data comprises either a plurality of OFDM symbols or a plurality of single carrier FDMA symbols, at least two of the OFDM symbols or at least two of the single carrier FDMA symbols in the subframe having different symbol durations;
- time multiplexing and placing a resource allocation control channel comprising a plurality of control OFDM/SC-FDMA symbols at the start of the subframe, wherein the resource allocation control contains at least downlink resource allocation, uplink resource allocation and acknowledgment control information for one or more remote units and wherein the downlink and uplink resource allocation allocates time/frequency resources to the one or more remote units and wherein the acknowledgement control information is HARQ ACK/NACK feedback information;
- transmitting the subframe of data including the resource allocation control channel over the radio frame;
- and
- wherein the resource allocation control comprises a persistent resource allocation control message that allocates a persistent resource which remains applicable for more than one frame.
3 more elements
A method for transmitting data by a base station within a communication system, the method comprising the steps of:
- receiving data to be transmitted over a radio frame, wherein the radio frame is comprised of a plurality of subframes;
- placing data within a subframe in the radio frame to produce a subframe of data, wherein the subframe of data comprises either a plurality of OFDM symbols or a plurality of single carrier FDMA symbols, at least two of the OFDM symbols or at least two of the single carrier FDMA symbols in the subframe having different symbol durations;
- time multiplexing and placing a resource allocation control channel comprising a plurality of control OFDM/SC-FDMA symbols at the start of the subframe, wherein the resource allocation control contains at least downlink resource allocation, uplink resource allocation and acknowledgment control information for one or more remote units and wherein the downlink and uplink resource allocation allocates time/frequency resources to the one or more remote units and wherein the acknowledgement control information is HARQ ACK/NACK feedback information;
- transmitting the subframe of data including the resource allocation control channel over the radio frame;
- and
- wherein the resource allocation control includes a persistent resource turn-off control message that releases a persistent resource allocation.
3 more elements
Dependencies are inferred from the claim text.