PHICH Resource Determination Using Single Slot Reference Signal
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting and receiving wireless signals, particularly in determining resources for physical hybrid ARQ indicator channels (PHICH) signals in relation to reference signals (RS) for physical uplink shared channel (PUSCH) signals.
Innovation Solution
A method and device for efficiently transmitting and receiving wireless signals by configuring a user equipment (UE) to receive control information, including receiving a physical downlink control channel (PDCCH) signal with uplink scheduling information, transmitting a PUSCH signal using this information, and receiving a PHICH signal with acknowledgement information, where the reference signal exists only in one slot per resource block (RB) pair and the resource for PHICH is determined using the index of that slot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reference signals are placed in both slots of an RB pair for PUSCH transmission, then channel estimation reliability is improved, but PHICH resource determination becomes ambiguous and system complexity increases
Solution Approach 1:
The patent segments the RB pair into two slots and places the reference signal in only one specific slot (determined by a flag in uplink grant DCI). This segmentation resolves the contradiction by providing a unique PHICH resource determination basis while maintaining reliable channel estimation through the single reference signal position.
2Measurement precision
If reference signals are placed in both slots of an RB pair, then channel estimation accuracy is improved, but resource allocation efficiency for PHICH decreases
Solution Approach 1:
The patent applies local quality by concentrating the reference signal in a specific slot rather than distributing it evenly across both slots. This localized approach improves resource allocation efficiency for PHICH while maintaining sufficient channel estimation accuracy through the strategically positioned reference signal.
3Reliability
If reference signals exist in both slots, then signal transmission robustness is improved, but PHICH group index and sequence index determination becomes difficult
Solution Approach 1:
The patent enables self-service by using the slot index containing the reference signal as a direct input for determining PHICH group index and sequence index. This self-referential approach simplifies resource indexing while maintaining signal transmission robustness through the reference signal's presence in the identified slot.
Data Source
AI summary
The present invention relates to a wireless communication system. Particularly, the present invention relates to a method for receiving control information in a wireless communication system and a device therefor, the method comprising the steps of: receiving a PDCCH signal including uplink scheduling information; transmitting a PUSCH signal by using the uplink scheduling information; and receiving a PHICH signal including acknowledgement information on the PUSCH signal, wherein an RS for the PUSCH signal exists only in one slot per RB pair within an RB set in which the PUSCH signal is transmitted, and a resource for receiving the PHICH signal is determined by using an index of the slot in which the RS exists.