PHICH Allocation Using Extended DMRS Parameters
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Solution Overview
Problem
In LTE technology, the limited cyclic shift values of DMRS for PHICH allocation lead to conflicts when multiple UEs are multiplexed, resulting in incorrect uplink data transmission judgments and reduced transmission quality due to the inability to meet PHICH configuration requirements.
Innovation Solution
The method involves using an extended parameter and cyclic shift value of the demodulation reference signal to widen the adjustment range for allocating PHICH channels, allowing for more precise allocation by incorporating cell-specific and user-equipment-specific parameters, which are transmitted through the PDCCH or higher-layer signaling, to determine the PHICH index number for uplink data transmission blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If limited cyclic shift values of DMRS are used for PHICH allocation, then device complexity is reduced, but PHICH allocation capability deteriorates causing conflicts when multiple UEs are multiplexed
Solution Approach 1:
The patent introduces a new dimension for PHICH allocation by combining DMRS cyclic shift values with extended parameters (such as orthogonal cover code indices or resource block indices). This multi-dimensional approach transforms the single-dimensional cyclic shift allocation into a multi-dimensional allocation space, enabling unique PHICH identification for multiple UEs without increasing DMRS complexity.
Solution Approach 2:
The patent changes the allocation parameters by introducing extended parameters beyond the traditional DMRS cyclic shift values. These extended parameters (e.g., orthogonal cover code indices, resource block indices) are combined with cyclic shift values to create a composite PHICH allocation mechanism, effectively expanding the allocation capability while maintaining the original DMRS structure.
2Quantity of substance
If more UEs are multiplexed in uplink, then system capacity is improved, but PHICH allocation conflicts increase due to limited cyclic shift values
Solution Approach 1:
By introducing extended parameters as additional dimensions, the patent creates a multi-dimensional allocation space that can accommodate more UEs uniquely. Each UE is assigned a unique combination of cyclic shift value and extended parameter, preventing allocation conflicts and maintaining reliable PHICH identification even as the number of multiplexed UEs increases.
Solution Approach 2:
The patent segments the PHICH allocation process into multiple independent components: DMRS cyclic shift values and extended parameters (such as orthogonal cover code indices or resource block indices). This segmentation allows each component to independently contribute to the overall allocation capability, enabling the system to support more UEs without increasing the complexity of individual components.
3Adaptability or versatility
If extended parameters are introduced for PHICH allocation, then allocation capability is improved, but device complexity increases
Solution Approach 1:
The patent adds extended parameters as additional dimensions to the existing PHICH allocation framework rather than fundamentally redesigning the system. This approach leverages the existing DMRS cyclic shift mechanism and supplements it with additional independent parameters, improving allocation capability while maintaining compatibility with existing structures and reducing overall system complexity.
Solution Approach 2:
The extended parameters introduced in the patent serve multiple functions: they provide unique PHICH identification, maintain compatibility with existing DMRS structures, and enable support for various uplink multiplexing scenarios. This multi-functionality reduces the need for separate mechanisms for different scenarios, thereby reducing overall device complexity while improving allocation capability.
Data Source
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AI summary
Embodiments of the present invention disclose a method and a device for allocating a physical hybrid ARQ indicator channel, and a user equipment. The method for allocating a physical hybrid ARQ indicator channel includes: determining, according to an extended parameter, a cyclic shift value of a demodulation reference signal that is indicated in a Physical Downlink Control Channel PDCCH, and a minimum labeling index value of a physical resource block PRB that is occupied by an uplink data transmission block, a PHICH index number that corresponds to the uplink data transmission block, where the extended parameter includes a cell-specific parameter and a user-equipment-specific parameter; and allocating a PHICH to the uplink data transmission block according to the PHICH index number. In the method and the device for allocating a physical hybrid ARQ indicator channel, and the user equipment according to the embodiments of the present invention, through the extended parameter and the cyclic shift value of the demodulation reference signal, an adjustment range is widened when a base station allocates a PHICH channel to the UE.