Interference cancellation method and apparatus for enhanced physical downlink control channel
AssigneeAlcatel Lucent
InventorsYan Zhao, Xiaobo Zhang, Huan Sun
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Abstract
Embodiments of the present invention provide an interference cancellation method for an enhanced physical downlink control channel E-PDCCH, comprising steps of: (1) allocating different orthogonal covering code OCC sequences to different cells and/or different users; and (2) combining a plurality of control channel elements CCEs constituting one PDCCH with a cell-specific OCC sequence and/or a user-specific OCC sequence respectively, so as to enable a user equipment to cancel interference on the PDCCH.
Claims20
An interference cancellation method for an enhanced physical downlink control channel E-PDCCH, comprising:
- allocating different orthogonal covering code OCC sequences to different cells and/or different users;
- and
- combining a plurality of control channel elements CCEs constituting one PDCCH by a cell-specific OCC sequence and/or a user-specific OCC sequence respectively, so as to enable a user equipment to cancel interference on the PDCCH.
A method for allocating orthogonal covering codes OCCs in an enhanced physical downlink control channel E-PDCCH, comprising:
- dividing all available OCC sequences into LN groups, and each OCC sequence group being allocated to one cell;
- and
- dividing the each OCC sequence group into KN sequences, and each sequence being allocated to one user;
- wherein when the OCC sequences are orthogonal sequences, LN·KN=N, and when the OCC sequences are semi-orthogonal sequences, LN·KN>N, where N denotes an aggregation level of a PDCCH.
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An interference cancellation apparatus for an enhanced physical downlink control channel E-PDCCH, comprising:
- an allocating device configured to allocate different orthogonal covering code OCC sequences to different cells and/or different users;
- and
- a combining device configured to combine a plurality of control channel elements CCEs constituting one PDCCH with a cell-specific OCC sequence and/or a user-specific OCC sequence respectively, so as to enable a user equipment to cancel interference on the PDCCH.
An apparatus for allocating orthogonal covering codes OCCs in an enhanced physical downlink control channel E-PDCCH, comprising:
- a first allocating device configured to divide all available OCC sequences into LN groups, each OCC sequence group being allocated to one cell;
- and
- a second allocating device configured to divide the each OCC sequence group into KN sequences, each sequence being allocated to one user;
- wherein when the OCC sequences are orthogonal sequences, LN·KN=N, and when the OCC sequences are semi-orthogonal sequences, LN·KN>N, where N denotes an aggregation level of a PDCCH.
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Dependencies are inferred from the claim text.