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 each include one or more first bits suffering from CRS interference arising from one or more other base stations and that are to be subjected to bit-level muting, and allocating one or more second bits of each of the identified REs, which do not suffer from the CRS interference, to the identified REs, and not allocating the one or more first bits to the identified REs, 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.
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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 each include one or more first bits suffering from CRS interference arising from one or more other base stations and that are to be subjected to bit-level muting, and allocating one or more second bits of each of the identified REs, which do not suffer from the CRS interference, to the identified REs, and not allocating the one or more first bits to the identified REs, 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 that each include one or more first bits suffering from CRS interference arising from one or more other base stations and that are to be subjected to bit-level muting and allocates one or more second bits of each of the identified REs, which do not suffer from the CRS interference, to the identified REs and does not allocate one or more first bits of each of the identified REs to the identified REs, 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 that each include one or more first bits suffering from CRS interference arising from one or more other base stations and that are to be subjected to bit-level puncturing wherein Log-Likelihood ratios (LLRs) corresponding to the one or more first bits in each of 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; wherein the identified REs each include one or more second bits which do not suffer from the CRS interference and are not punctured or discarded. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification