PHICH Resource Mapping for Multi-Carrier HARQ-ACK Signals
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Solution Overview
Problem
In wireless communication systems, the existing methods for transmitting HARQ-ACK signals in response to PUSCH transmissions face challenges such as PHICH resource collisions and inefficient multiplexing, especially in systems with multiple component carriers, leading to increased overhead and interference.
Innovation Solution
The method involves determining and using two resources identified by a group index and a sequence index based on the index IPRB_RAlowest_index and its cyclic shift for transmitting two acknowledgement bits, allowing for efficient mapping of PHICH resources across multiple component carriers and avoiding collisions, while also supporting 2-bit HARQ-ACK signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods for transmitting HARQ-ACK signals are used in systems with multiple component carriers, then the basic acknowledgement function is maintained, but PHICH resource collisions occur and overhead increases
Solution Approach 1:
The patent segments the PHICH resource allocation by introducing separate group index and sequence index determination methods for different component carriers. Each component carrier's HARQ-ACK signals are mapped to distinct PHICH resources through carrier-specific indexing, preventing resource collisions between carriers while maintaining reliable acknowledgement transmission.
Solution Approach 2:
The patent extends the PHICH resource mapping from a single-dimension approach to a two-dimensional indexing system using both group index and sequence index. This dimensional expansion allows for more granular resource allocation across multiple component carriers, enabling efficient multiplexing and reducing interference.
2Productivity
If existing PHICH resource mapping methods are used, then single component carrier support is maintained, but resource allocation efficiency decreases and overhead increases in multi-carrier systems
Solution Approach 1:
The patent creates a universal PHICH resource mapping framework that functions across both single and multi-component carrier systems. The group index and sequence index determination methods are designed to be carrier-agnostic, allowing the same mechanism to efficiently allocate resources whether one or multiple carriers are present, thereby improving productivity without increasing overhead.
Solution Approach 2:
The patent changes the mapping parameters from simple single-carrier indexing to a composite indexing system using group index and sequence index derived from multiple input parameters including component carrier ID, physical resource block index, and cyclic shift values. This parameter transformation enables more efficient resource utilization in multi-carrier environments.
Data Source
AI summary
Methods are described for a Node B to transmit and for a User Equipment (UE) to receive ACKnowledgement (ACK) information associated with the use of Hybrid Automatic Repeat reQuest (HARQ), also known as HARQ-ACK signaling, in a communication system that includes multiple downlink component carriers or multiple uplink component carriers. An HARQ-ACK signal to a UE is in response to a data packet transmission from the UE and may consist of 2 information bits when the UE has 2 or more transmitter antennas. The HARQ-ACK signal is always located in the same downlink component carrier as the scheduling assignment resulting to the data packet transmission from the UE.