METHOD AND APPARATUS FOR BIT-LEVEL PDSCH MUTING AND/OR RECEIVER PUNCTURING IN LTE-ADVANCED HETEROGENEOUS NETWORKS
First Claim
1. A base station to transfer data to a user equipment, the base station comprising:
- an interface to receive radio resource management (RRM) measurement from the user equipment on received reference signal (RS) strength for each base station of one or more other base stations in a surrounding area of the user equipment;
an X2 interface to receive transmission information of almost blank subframes and corresponding cell-specific reference signal (CRS) resource element (RE) locations from the one or more other base stations; and
a controller to manage bit-level PDSCH (Physical Downlink Shared Channel) muting information, which includes identifying PDSCH resource elements (REs) that suffer the most from CRS interference arising from other base stations and that are to be subjected to bit-level muting, and allocating to the identified REs a number of bits less than the number of bits allocated to normal REs which are same as an underlying modulation order, based on the received almost blank subframes and the corresponding CRS RE locations and interference information received via RRM measurement reports, and to transfer data with two levels of bit allocations to various PDSCH REs to the user equipment.
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Accused Products
Abstract
A base station (BS) comprises: an interface to receive radio resource management (RRM) measurement from user equipment on received reference signal (RS) strength for each BS of one or more other BSs in a surrounding area of the user equipment; an X2 interface to receive transmission information of almost blank subframes and corresponding cell-specific reference signal (CRS) resource element (RE) locations from the one or more other BSs; and a controller to manage bit-level PDSCH (Physical Downlink Shared Channel) muting information, which includes identifying PDSCH resource elements (REs) that suffer the most from CRS interference arising from other BSs and that are to be subjected to bit-level muting, and allocating to the identified REs a number of bits less than the number of bits allocated to normal REs, and to transfer data with the two levels of bit allocations to various PDSCH REs to the user equipment.
50 Citations
19 Claims
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1. A base station to transfer data to a user equipment, the base station comprising:
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an interface to receive radio resource management (RRM) measurement from the user equipment on received reference signal (RS) strength for each base station of one or more other base stations in a surrounding area of the user equipment; an X2 interface to receive transmission information of almost blank subframes and corresponding cell-specific reference signal (CRS) resource element (RE) locations from the one or more other base stations; and a controller to manage bit-level PDSCH (Physical Downlink Shared Channel) muting information, which includes identifying PDSCH resource elements (REs) that suffer the most from CRS interference arising from other base stations and that are to be subjected to bit-level muting, and allocating to the identified REs a number of bits less than the number of bits allocated to normal REs which are same as an underlying modulation order, based on the received almost blank subframes and the corresponding CRS RE locations and interference information received via RRM measurement reports, and to transfer data with two levels of bit allocations to various PDSCH REs to the user equipment. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A user equipment to receive data from a base station, the user equipment comprising:
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a radio resource management (RRM) module to perform RRM measurement on received reference signal (RS) strength for each base station of one or more other base stations in a surrounding area of the user equipment; and an interface to receive data with bit-level PDSCH (Physical Downlink Shared Channel) muting from the base station which, based on almost blank subframes having a plurality of resource elements (RE) and cell-specific reference signal (CRS) resource element (RE) locations from the one or more other base stations and the RRM measurement from the user equipment, identifies the REs to be subjected to bit-level muting and allocates to the identified REs a number of bits less than the number of bits allocated to normal REs which are not to be muted, and transfer the data with the bit-level muting of the identified REs to the user equipment via the interface. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A user equipment to receive data from a base station, the user equipment comprising:
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a radio resource management (RRM) module to perform RRM measurement on received reference signal (RS) strength for each base station of one or more other base stations in a surrounding area of the user equipment; an interface to receive data from the base station, and to receive almost blank subframes having a plurality of resource elements (REs) and cell-specific reference signal (CRS) resource elements from the one or more other base stations; and a bit-level PDSCH (Physical Downlink Shared Channel) puncturing module to identify the PDSCH REs in the received data to be subjected to bit-level puncturing wherein Log-Likelihood ratios (LLRs) corresponding to some bits in the identified PDSCH REs are punctured or discarded, based on the received almost blank subframes and corresponding CRS RE locations and interference information obtained during the RRM measurements. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification