PDSCH Resource Mapping Around DMRS-Restricted NR Resources
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Solution Overview
Problem
In the new radio (NR) system, resources that cannot be used for PDSCH transmission result in wasted RBGs, and the protocol's restrictions on DMRS overlap with these resources affect channel estimation and reception performance.
Innovation Solution
A method and apparatus for a terminal device and network device to determine and utilize a third resource that includes both downlink data channel and demodulation reference signal transmission, while avoiding resources that cannot be used for PDSCH, thereby improving resource utilization without impacting reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional communication methods are used in unlicensed spectrum, then communication coverage can be extended, but communication reliability deteriorates due to listen-before-talk mechanisms and interference from non-Wi-Fi devices
Solution Approach 1:
The patent introduces a base station as an intermediary that centrally manages uplink resource allocation for multiple terminal devices. The base station receives buffer status reports from terminals, determines appropriate uplink resources, and allocates them through dedicated signaling, thereby mediating between terminal communication needs and spectrum availability while avoiding the reliability issues of distributed LBT mechanisms.
Solution Approach 2:
The patent implements a feedback mechanism where terminal devices send buffer status reports to the base station, which then uses this feedback information to make informed uplink resource allocation decisions. This closed-loop feedback system enables the base station to adapt resource allocation to actual traffic conditions, improving both reliability and efficiency in unlicensed spectrum operations.
2Device complexity
If random access channels are used for uplink communication, then device complexity is reduced, but resource waste increases due to repeated transmissions and collisions
Solution Approach 1:
The patent implements preliminary action by having the base station proactively allocate uplink resources to terminal devices before data transmission is needed. The base station receives buffer status reports in advance, determines appropriate resources, and prepares allocation decisions beforehand, thereby avoiding the need for terminals to perform complex random access procedures and reducing resource waste from collisions and retransmissions.
Solution Approach 2:
The patent enables a form of self-service where terminal devices automatically send buffer status reports when their uplink data buffers reach a threshold, triggering the base station's resource allocation process. This semi-automatic mechanism reduces the need for complex terminal-side resource selection algorithms while ensuring timely resource allocation without excessive resource waste.
3Power
If terminals autonomously select uplink resources, then base station processing load is reduced, but communication efficiency deteriorates due to collisions and repeated transmissions
Solution Approach 1:
The patent segments the uplink resource allocation process into distinct phases: terminal devices autonomously monitor and report buffer status, the base station processes this information and makes allocation decisions, and then allocates resources through dedicated signaling. This segmentation allows terminals to perform simple autonomous monitoring while the base station handles the complex allocation logic, balancing processing load with communication efficiency.
Solution Approach 2:
The patent implements a dynamic resource allocation mechanism where the base station continuously adjusts uplink resource allocation based on real-time buffer status reports from terminals. This dynamic approach allows the system to adapt to changing traffic conditions, optimizing communication efficiency while the base station maintains centralized control to avoid terminal-side complexity.
Data Source
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Figure 3
AI summary
Embodiments of this application provide a communication method, device, and system, to improve resource utilization without affecting reception performance of a downlink data channel. The solution includes: A terminal device receives configuration information from a network device. The terminal device receives downlink control information from the network device. The terminal device determines a first resource based on the configuration information, where the first resource is a resource that cannot be used to transmit a downlink data channel and a demodulation reference signal of the downlink data channel. The terminal device determines a second resource based on the downlink control information, where the second resource includes a resource used to transmit the downlink data channel and the demodulation reference signal of the downlink data channel. The terminal device determines a third resource based on the first resource and the second resource, where the third resource is a resource that is in the second resource and that is used to transmit the downlink data channel and the demodulation reference signal of the downlink data channel. The terminal device receives, on the third resource, the downlink data channel and the demodulation reference signal of the downlink data channel from the network device.