Uplink Signal Transmission via Multi-Node Coordinated Scheduling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting uplink signals with low latency and high reliability, particularly in scenarios requiring ultra-reliable and low-latency communications (URLLC), where traditional methods struggle to minimize control information overhead and ensure reliable transmission with short scheduling time units.
Innovation Solution
The implementation of a method and apparatus for user equipment (UE) operation that utilizes a multi-node system with coordinated data transmission across multiple input multiple output (MIMO) nodes, employing techniques like joint processing, dynamic point selection, and coordinated scheduling to improve signal transmission reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional uplink transmission methods are used, then device complexity is reduced, but reliability and latency performance deteriorate for URLLC scenarios
Solution Approach 1:
The patent segments the uplink transmission process into distinct phases: initial transmission on PUSCH, fallback to PUCCH format 1b if needed, and further fallback to PUCCH format 1a if necessary. This segmentation allows the system to achieve high reliability through multiple transmission paths while managing device complexity by providing clear, staged procedures for each transmission scenario.
Solution Approach 2:
The patent implements dynamic point selection where the transmission point (gNodeB or eNodeB) is selected dynamically based on channel conditions and scheduling decisions. The UE can switch between different transmission modes (PUSCH, PUCCH format 1b, PUCCH format 1a) dynamically, allowing the system to adapt to changing conditions and maintain reliability without requiring permanently complex device architecture.
2Reliability
If multiple nodes are used for coordinated transmission, then reliability is improved, but control information overhead increases
Solution Approach 1:
The patent makes the PUCCH resource versatile by enabling it to carry both fallback transport blocks and HARQ-ACK information simultaneously in certain configurations. This multi-functionality allows coordinated transmission between multiple nodes without requiring separate dedicated resources for each type of information, thereby reducing overall control overhead while maintaining reliability.
Solution Approach 2:
The patent changes the parameters of PUCCH formats to accommodate multiple functions. PUCCH format 1b is configured to carry 2-bit HARQ-ACK and 2-bit fallback transport block simultaneously, and format 1a is configured to carry 1-bit HARQ-ACK and 1-bit fallback transport block. These parameter changes enable efficient multiplexing of information types, reducing overhead while supporting reliable coordinated transmission.
3Loss of time
If short scheduling time units are used, then latency is reduced, but scheduling complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-configuring fallback PUCCH resources and transmission parameters before actual data transmission is needed. The UE is pre-configured with multiple PUCCH resources and the conditions for switching between them, allowing rapid response to transmission failures without requiring complex real-time scheduling decisions, thus reducing latency while managing complexity.
Solution Approach 2:
The patent implements feedback mechanisms where the gNodeB provides scheduling decisions and the UE provides transmission status information. This feedback loop enables adaptive scheduling with short time units by allowing the system to quickly adjust based on actual transmission outcomes, reducing latency through rapid iteration while managing complexity through structured feedback protocols.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
A method for transmitting an uplink signal by a user equipment, UE, in a wireless communication system, is proposed, which comprises: receiving first information for scheduling a first uplink signal, wherein the first uplink signal is scheduled on a plurality of resources including a first resource based on the first information; receiving second information for scheduling a second uplink signal, wherein the second uplink signal is scheduled on the first resource based on the second information; transmitting, via the first resource, the second uplink signal; and transmitting, via a second resource other than the first resource, the first uplink signal, wherein the second resource is included in the plurality of resources.