Optimized signaling of demodulation reference signal patterns
First Claim
1. A method of determining Cyclic Shift (CS) and Orthogonal Cover Code (OCC) values associated with DeModulation Reference Signals (DMRS), for each transmission layer, by a transceiver in a wireless communication system employing Multiple Input Multiple Output (MIMO) operation, comprising:
- receiving a semi-static CS value nDMRS(1);
receiving a dynamic CS index value nDMRS;
indexing a predetermined table with nDMRS to obtain a first CS value nDMRS(2) and an OCC value nDMRSOCC associated with DMRS for layer 0;
deriving a first CS value associated with DMRS for each other layer by adding a different integer multiple of a predetermined minimum offset to nDMRS(2); and
calculating a second CS value for each layer by adding nDMRS(1) to the first CS value;
wherein within the predetermined table, the CS values nDMRS(2) are arranged in two or more sets of CS values nDMRS(2), the CS values nDMRS(2) within each set being separated by the predetermined minimum offset.
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Abstract
Orthogonality in cyclic shift (CS) and orthogonal cover code (OCC) selection for DMRS in MIMO is improved by new nDMRS to nDMRS(2) mapping patterns. Values in the mapping tables are arranged in sets, with minimum CS separation between the values in each set. Additionally, the semi-static nDMRS is independently configurable for each UL component carrier (CC) in the case of cross-CC scheduling in carrier aggregation, and the PHICH allocation formula that defines the allocation of the PHICH process relative to the kth codeword (CW) on the cth UL CC is a function of both the CS index nDMRS,k,c(2) that is dynamically assigned to a certain layer of the considered CW and the semi-static CS offset nDMRS,c(1) for the cth CC.
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Citations
16 Claims
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1. A method of determining Cyclic Shift (CS) and Orthogonal Cover Code (OCC) values associated with DeModulation Reference Signals (DMRS), for each transmission layer, by a transceiver in a wireless communication system employing Multiple Input Multiple Output (MIMO) operation, comprising:
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receiving a semi-static CS value nDMRS(1); receiving a dynamic CS index value nDMRS; indexing a predetermined table with nDMRS to obtain a first CS value nDMRS(2) and an OCC value nDMRSOCC associated with DMRS for layer 0; deriving a first CS value associated with DMRS for each other layer by adding a different integer multiple of a predetermined minimum offset to nDMRS(2); and calculating a second CS value for each layer by adding nDMRS(1) to the first CS value; wherein within the predetermined table, the CS values nDMRS(2) are arranged in two or more sets of CS values nDMRS(2), the CS values nDMRS(2) within each set being separated by the predetermined minimum offset. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of determining Cyclic Shift (CS) and Orthogonal Cover Code (OCC) values associated with DeModulation Reference Signals (DMRS) for each transmission layer and component carrier, and Physical Channel (PHICH) allocation, by a receiver in a wireless communication system employing Multiple Input Multiple Output (MIMO) operation and carrier aggregation, comprising:
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receiving a semi-static CS value nDMRW,c(1) associated with each component carrier (CC) in the case of cross-CC scheduling; and wherein the allocation of the PHICH process relative to the kth codeword on the Cth CC is a function of both a first CS value nDMRS,k,c(2) associated with DM RS for a certain layer of a codeword and the semi-static CS value nDMRS,c(1) associated with the cth CC. - View Dependent Claims (14, 15, 16)
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Specification