COMMON MAPPING OF RESOURCE ELEMENTS TO ENHANCED RESOURCE ELEMENT GROUPS

摘要

The invention relates to a universal mapping of resource elements (REs) to enhanced resource element groups (eREG) that applies to both the PDCCH and PDSCH regions; the mapping is universal since it is not user or cell-specific but applies to the resource block pairs irrespective of the actual reference signals used. The mapping is such that all REs of the resource block pair are assigned to one out of a plurality of eREGs. According to the mapping, the REs are sequentially assigned to the eREGs, in predetermined orders. Within an OFDM symbol a pair of REs is assigned to the same eREG, wherein the two REs are spaced apart from each other by 3 or 6 subcarriers.

主权项

1. A base station in a communication system using Orthogonal Frequency-Division Multiplexing (OFDM) comprising:
a processor which, in operation, implements a mapping that applies to each of a first and second frequency domain half of a resource block pair, wherein resource elements (REs) of the resource block pair are assigned to a plurality of resource element groups according to the mapping; and a transmitter which, in operation, transmits control channel information based on the resource element groups according to the mapping; wherein the resource elements of the first OFDM symbol are assigned to the resource element groups, in a first predetermined order of the resource elements and a second predetermined order of the resource element groups, the resource elements of the second OFDM symbol and of each of the remaining OFDM symbols in the resource block pair are assigned to the resource element groups, in the first predetermined order of the resource elements and in the second predetermined order of the resource element groups, such that the first resource element group to be assigned for an OFDM symbol is the one subsequent-in-order to the last resource element group assigned for the previous OFDM symbol, and space-frequency block coding (SFBC) is used for transmitting resource element groups in a resource block pair, one out of a plurality of SFBC pairs is defined to use two resource elements of the same resource element group within each OFDM symbol, wherein one of the two resource elements of the SFBC pair in the same OFDM symbol has a subcarrier index k and another of the two resource elements of the SFBC pair has a subcarrier index k+3 or k+6 in a frequency domain.