PHICH Resource Signaling for Incomplete Subframe Reception
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Solution Overview
Problem
In wireless communications networks, when a device preempts a channel in an unlicensed spectrum, incomplete subframes can be sent, leading to the receive end being unable to determine the number of OFDM symbols, resulting in incorrect reception.
Innovation Solution
A network device determines and sends PHICH resources indicating the number of OFDM symbols in a second subframe, allowing user equipment to correctly receive the incomplete subframe by using these resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a device sends data at a random time after successfully preemting a channel in unlicensed spectrum, then data throughput increases, but the first subframe may become incomplete causing the receive end to be unable to determine the quantity of OFDM symbols
Solution Approach 1:
The patent applies preliminary action by indicating the quantity of OFDM symbols in advance through PHICH resources before the actual data transmission. The network device determines and signals the OFDM symbol quantity using PHICH group number and orthogonal sequence number, allowing the user equipment to prepare for correct reception of the incomplete subframe before receiving the actual data
Solution Approach 2:
The patent uses PHICH resources as an intermediary to convey the quantity of OFDM symbols. The PHICH group number and orthogonal sequence number serve as intermediate indicators that bridge the gap between the random preemption timing and the structured subframe format, enabling the receiver to interpret the incomplete subframe correctly
2Adaptability or versatility
If data is sent at random time after channel preemption, then spectrum utilization improves, but the receive end cannot correctly receive the incomplete subframe
Solution Approach 1:
The patent changes the parameter representation by using PHICH resource parameters (group number and orthogonal sequence number) to indicate the quantity of OFDM symbols. This parameter transformation allows the system to maintain flexible random access timing while providing structured information about the subframe composition for reliable reception
Data Source
AI summary
The present invention discloses an information transmission method, a device, and a system, which relates to the communications field, so as to resolve a prior-art problem that a receive end cannot determine a quantity of OFDMs included in an incomplete subframe, and cannot correctly receive the incomplete subframe. A specific solution is as follows: A network device determines one or more PHICH resources of a first subframe, where the one or more physical hybrid automatic repeat request indicator channel PHICH resources indicate a quantity of orthogonal frequency division multiplexing OFDM symbols included in a second subframe on an unlicensed carrier; and the network device sends the first subframe and the second subframe to user equipment. The present invention is used for information transmission.