Physical structure and reference signal utilization of enhanced physical downlink control channel for OFDM/OFDMA systems
First Claim
1. A method of decoding downlink control information by a user equipment (UE) in an OFDM/OFDMA system, the method comprising:
- (a) receiving a control signal from a base station to determine received downlink control physical resource blocks (PRBs) that carry the downlink control information;
(b) determining a set of candidate enhanced physical downlink control channels (ePDCCHs) within the downlink control PRBs, wherein each ePDCCH is associated with a set of enhanced control channel elements (eCCEs) for ePDCCH transmission;
(c) collecting a plurality of enhanced resource element groups (eREGs) for each eCCE, wherein each eCCE comprises a number of eREGs based on an eCCE to eREG mapping rule, and wherein the plurality of eREGs for one eCCE are distributed in a plurality of PRB pairs;
(d) collecting a plurality of resource elements (REs) for each eREG, wherein each eREG comprises a number of REs based on an eREG to RE mapping rule; and
(e) decoding the downlink control information that are mapped to the collected REs.
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Abstract
A two-level physical structure is defined for better diversity for both distributed and localized transmission in enhanced physical downlink control channel (ePDCCH). First level is a physical unit of enhanced resource element groups (eREGs), where the group of REs is predefined for each eREG. Second level is a logical unit of enhanced control channel elements (eCCEs), where the group of eREGs is predefined or configurable by higher layer for each eCCE. For distributed transmission of ePDCCH, eCCE consists of several eREGs that are distributed in multiple non-contiguous PRBs spreading over the whole channel frequency. Downlink control information (DCI) is transmitted on a number of aggregated eCCEs according to the modulation and coding level required. The utilization reference signals of antenna ports for ePDCCH demodulation is based on the logical order of eCCEs and the aggregation level for DCI transmission.
26 Citations
17 Claims
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1. A method of decoding downlink control information by a user equipment (UE) in an OFDM/OFDMA system, the method comprising:
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(a) receiving a control signal from a base station to determine received downlink control physical resource blocks (PRBs) that carry the downlink control information; (b) determining a set of candidate enhanced physical downlink control channels (ePDCCHs) within the downlink control PRBs, wherein each ePDCCH is associated with a set of enhanced control channel elements (eCCEs) for ePDCCH transmission; (c) collecting a plurality of enhanced resource element groups (eREGs) for each eCCE, wherein each eCCE comprises a number of eREGs based on an eCCE to eREG mapping rule, and wherein the plurality of eREGs for one eCCE are distributed in a plurality of PRB pairs; (d) collecting a plurality of resource elements (REs) for each eREG, wherein each eREG comprises a number of REs based on an eREG to RE mapping rule; and (e) decoding the downlink control information that are mapped to the collected REs. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A user equipment (UE), comprising:
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a receiver that receives downlink control information via an enhanced physical downlink control channel (ePDCCH) in an OFDM/OFDMA system, wherein the ePDCCH is associated with a set of enhanced control channel elements (eCCEs); and a decoder that decodes the downlink control information with reference signals of a first specific antenna port for ePDCCH demodulation based on a logical address of a single eCCE if the UE decodes the downlink control information utilizing the single eCCE, and decodes the downlink control information with reference signals of a second specific antenna port for ePDCCH demodulation based on a logical address of a specific eCCE among a plurality of eCCEs if the UE decodes the downlink control information utilizing the plurality of eCCEs, and wherein each eCCE consists of a plurality of enhanced resource element groups (eREGs) based on an eCCE to eREG mapping rule. - View Dependent Claims (8, 9)
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10. A user equipment (UE), comprising:
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a receiver that receives a control signal from a base station to determine received downlink control physical resource blocks (PRBs) that carry the downlink control information in an OFDM/OFDMA system; a controller that determines a set of candidate enhanced physical downlink control channels (ePDCCHs) within the downlink control PRBs, wherein each ePDCCH is associated with a set of enhanced control channel elements (eCCEs) for ePDCCH transmission; a collector circuit that collects a plurality of enhanced resource element groups (eREGs) for each eCCE, wherein each eCCE comprises a plurality of eREGs based on an eCCE to eREG mapping rule, wherein the plurality of eREGs for one eCCE are distributed in a plurality of PRB pairs, wherein the collector also collects a plurality of resource elements (REs) for each eREG, wherein each eREG comprises a plurality of REs based on an eREG to RE mapping rule; and a decoder that decodes the downlink control information that are mapped to the collected REs. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification