PHICH Resource Allocation for Multi-Codeword HARQ in LTE
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Solution Overview
Problem
The existing 3GPP LTE system only defines HARQ operation for uplink single codeword transmission, and there is a need for a method to configure PHICH resources to support HARQ operation for uplink multi-codeword transmission and retransmission in systems with multiple antennas, while avoiding PHICH resource collisions.
Innovation Solution
A method for allocating PHICH resources in a wireless communication system that involves receiving and transmitting HARQ ACK/NACK information for multiple codewords, where each codeword is allocated a unique set of PHICH resources based on parameters such as codeword indexes, modulation and coding schemes, and resource block settings, to ensure efficient transmission and avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PHICH resources are allocated for uplink multi-codeword transmission, then HARQ operation for MIMO transmission is supported, but PHICH resource collision may occur
Solution Approach 1:
The PHICH resources are segmented into multiple groups, with each codeword assigned to a specific PHICH group. This segmentation allows multiple codewords to be transmitted simultaneously without resource collision, as each codeword's HARQ acknowledgment is carried on a dedicated PHICH group resource.
Solution Approach 2:
Different PHICH resource configurations are applied locally to different codewords based on their specific parameters. Each codeword is assigned PHICH resources tailored to its modulation and coding scheme, resource block allocation, and codeword index, ensuring optimal resource utilization and collision avoidance.
2Productivity
If multiple PHICH resources are allocated for multiple codewords, then HARQ ACK/NACK information can be transmitted for each codeword, but resource allocation complexity increases
Solution Approach 1:
A universal PHICH resource allocation mechanism is implemented that handles both single-codeword and multi-codeword transmissions through a unified framework. The same PHICH group structure and resource allocation rules apply regardless of the number of codewords, simplifying the overall system design while maintaining support for multiple transmission modes.
Solution Approach 2:
PHICH resources are dynamically allocated based on changing transmission parameters such as codeword index, modulation and coding scheme, and resource block allocation. This parameter-based allocation approach allows the system to adapt to different transmission scenarios without requiring separate resource allocation mechanisms for each case.
Data Source
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AI summary
The present invention relates to a wireless communication system, and more specifically, disclosed are a method and a device for downlink confirmation response information transmission resource allocation. In one embodiment of the present invention, a method for transmitting downlink hybrid automatic repeat request (HARQ) confirmation response information in a wireless communication system comprises the steps of: receiving, on an uplink data channel, a plurality of codewords from an uplink transmitter; generating items of confirmation response information for each of the plurality of codewords, in accordance with the results of decoding of the plurality of codewords; and transmitting each of the generated items of confirmation response information to the uplink transmitter on each of a plurality of physical HARQ indicator channel (PHICH) resources; wherein each of the plurality of PHICH resources can be allocated for the transmission of confirmation response information for each of the plurality of codewords, based on parameters having different values for each of the codewords.