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EP-3734876-B1 - APERIODIC CHANNEL STATE INFORMATION REQUEST IN WIRELESS COMMUNICATION

EP3734876B1EP 3734876 B1EP3734876 B1EP 3734876B1EP-3734876-B1

Inventors

  • LUO, XILIANG
  • ZHANG, XIAOXIA
  • GAAL, PETER
  • XU, HAO
  • CHEN, WANSHI
  • MONTOJO, JUAN
  • LUO, TAO

Dates

Publication Date
20260513
Application Date
20110405

Claims (10)

  1. A method of wireless communication, comprising: receiving (2602) a request for a channel state information, hereinafter referred to as CSI, report on a component carrier of n component carriers, wherein the request triggers an aperiodic CSI report for at least one component carrier of the n component carriers; configuring (2604) the at least one component carrier of the n component carriers for which to report the aperiodic CSI report based on information configured semi-statically through radio resource control RRC signalling, and wherein the request includes one bit for indicating the at least one component carrier of the n component carriers to report; and transmitting (2606) the CSI report including feedback for each of the indicated component carriers (2008, 2102).
  2. The method of claim 1, further comprising refraining from determining CSI for any of the n component carriers when the request indicates that no CSI report is triggered.
  3. The method of claim 1 or 2, further comprising determining CSI for the indicated component carriers when the request indicates the CSI report is triggered, wherein the CSI report includes the determined CSI (2006).
  4. The method of any preceding claim, further comprising determining the n component carriers based on at least one of: an uplink subframe number, a system frame number, a predetermined set of component carriers, whether a physical downlink shared channel is received on a component carrier in the same subframe as the received request, a carrier indicator field in a received physical downlink control channel in a same subframe as the received request, a subset of bits of a resource allocation field, or information configured semi-statically through RRC signaling.
  5. The method of any preceding claim, further comprising: receiving a cyclic shift for demodulation reference signals, hereinafter referred to as DM-RS, from an uplink grant; and determining the set of component carriers based on the received cyclic shift.
  6. The method of claim 5, wherein the set of component carriers for which to send feedback is further determined based on a received reserved modulation and coding scheme, hereinafter referred to as MCS, index.
  7. A method of wireless communication, comprising: transmitting a request for a channel state information, hereinafter referred to as CSI, report on a component carrier of n component carriers, wherein the request triggers an aperiodic CSI report for at least one component carrier of the n component carriers and wherein the request includes one bit for indicating which component carriers to report; configuring the at least one component carrier of n component carriers configured semi-statically through radio resource control RRC signalling, before transmitting the request indicating the one bit indicating the at least one component carrier of n component carriers; and receiving the CSI report including feedback for each of the indicated component carriers (2810).
  8. An apparatus (100, 804) for wireless communication, comprising: means for receiving a request for a channel state information, hereinafter referred to as CSI, report on a component carrier of a n component carriers, wherein the request triggers an aperiodic CSI report for at least one component carrier of the n component carriers; means for configuring the at least one component carrier of the n component carriers for which to report the aperiodic CSI report based on information configured semi-statically though radio resource control RRC signalling, and wherein the request includes one bit for indicating the at least one component carriers of the n component carriers to report; and means for transmitting the CSI report including feedback for each of the indicated component carriers.
  9. An apparatus (100, 802) for wireless communication, comprising: means for transmitting a request for a channel state information, hereinafter referred to as CSI, report on a component carrier of n component carriers, wherein the request triggers an aperiodic CSI report for at least one component carrier of the n component carriers and wherein the request includes one bit for indicating which component carriers to report; means for configuring the at least one component carrier of n component carriers configured semi-statically through radio resource control RRC signalling, before transmitting the request indicating the one bit indicating the at least one component carrier of n component carriers; and means for receiving the CSI report including feedback for each of the indicated component carriers (2904).
  10. A computer program product, comprising: a computer-readable medium comprising code adapted to perform the method of any of claims 1 to 7 when executed on said computer program product.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application claims the benefit of U.S. Provisional Application Serial No. 61/321,043, entitled "Method and Apparatus that Facilitates Aperiodic Channel Quality Indicator Requests in Long Term Evolution Systems" and filed on April 5, 2010. BACKGROUND Field The present disclosure relates generally to communication systems, and more particularly, to aperiodic channel state information (CSI) requests in wireless communication. Background Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency divisional multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems. These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example of an emerging telecommunication standard is Long Term Evolution (LTE). LTE is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by Third Generation Partnership Project (3GPP). It is designed to better support mobile broadband Internet access by improving spectral efficiency, lower costs, improve services, make use of new spectrum, and better integrate with other open standards using OFDMA on the downlink (DL), SC-FDMA on the uplink (UL), and multiple-input multiple-output (MIMO) antenna technology. However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in LTE technology. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. In LTE Release 10 (Rel-10), carrier aggregation is supported with multiple component carriers (CCs) in the DL/UL. If one UL CC is responsible for aperiodic CSI reporting for multiple CCs, a UE needs be able to determine for which DL CCs to report the CSI. As such, there is a need for methods and apparatuses for conveying a set of CCs for which a CSI report should be provided. Patent Application EP 1 909 518 relates to a communication terminal apparatus that can eliminate the waste of reception quality report, suppress the interference of an upstream network, perform an optimum assignment using a scheduling, prevent the loss of resources, and ensure the fairness of transmission assignment using the scheduling. In this apparatus, a reception quality determining part uses a pilot signal, which is included in a received signal, to determine the reception quality for each of subcarrier blocks. A CQI generating part generates CQIs each of which is the information indicative of a result of the determination by the reception quality determining part. A sorting part sorts the CQIs in descending or ascending order of the reception quality. A control part instructs, based on information about the number of subcarrier blocks in which the CQIs have been transmitted, collision information and scheduling information, the sorting part with respect to the number of subcarrier blocks in which the CQIs are outputted. SUMMARY Aspects of the present invention are set out in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system.FIG. 2 is a diagram illustrating an example of a network architecture.FIG. 3 is a diagram illustrating an example of an access network.FIG. 4 is a diagram illustrating an example of a frame structure for use in an access network.FIG. 5 shows an exemplary format for the UL in LTE.FIG. 6 is a diagram illustrating an example of a radio protocol architecture for user and control plane.FIG. 7 is a diagram illustrating an example of an evolved Node B and user equipment in an access network.FIG. 8 is a diagram illustrating an aperiodic CSI request in LTE.FIG. 9 is a diagram illustrating an aperiodic CSI request in LTE.FIG. 10 is a diagram illustrating an exemplary method for aperiodic CSI requests.FIG. 11 is a diagram illustrating a first exemplary method for conveying the set of CCs for which the CSI report may be provided.FIG. 12 is a first diagram illustrating a second exemplary method for conveying the set of CCs for which the CSI report may be provided.FIG. 13 is a second diag