Fay Sharpe LLP
Method and apparatus for enhancing transmission of downlink ACK/NACK signal
The invention relates to a method and apparatus for enhancing transmission of a downlink ACK/NACK signal in an LTE communication system. In order to attain the object of enhancing transmission of a downlink ACK/NACK signal, the invention proposes an enhanced design of the current PHICH and thus makes an enhanced PHICH (E-PHICH). The enhanced design is focused primarily upon the following aspects: the first aspect is to configure an E-PHICH in the legacy PDSCH and to transmit an ACK/NACK signal in the E-PHICH so that a UE demodulates the E-PHICH to obtain the ACK/NACK signal. The second aspect is to improve a PHICH-and-PUSCH association design by designing an implicit association between an E-PHICH index and a radio frequency resource occupied by a UL grant (in a legacy PDCCH or an E-PDCCH) and an explicit association between a PUSCH scheduled by a UL grant and an E-PDCCH respectively and to transmit an ACK/NACK signal in the E-PHICH so that a UE demodulates the E-PHICH to obtain the ACK/NACK signal. With the invention, transmission of a downlink ACK/NACK signal in an LTE communication system can be enhanced.
Alcatel Lucent
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Jianguo Zheng Gang Qi
Liu Liu Shen Jiang