Sidelink Channel Resource Allocation via Fast Feedback
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in managing sidelink channels, particularly in allocating resources based on channel state indicators, leading to unreliable and low-quality communications, which result in wasted processing resources and increased latency.
Innovation Solution
User equipment (UE) can provide fast feedback to the base station by requesting additional resources for sidelink channels without transmitting data, based on determining that the allocated resources do not meet reliability thresholds, allowing for resource reallocation and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resources are allocated based on initial channel state indicators, then resource allocation is simplified, but communication reliability deteriorates due to outdated channel state information
Solution Approach 1:
The patent implements a feedback mechanism where the receiving UE sends channel state indicators (CSI) to the transmitting UE, which then reports to the base station. This continuous feedback loop ensures the base station has updated channel state information for accurate resource allocation, resolving the contradiction between allocation simplicity and reliability.
Solution Approach 2:
The base station performs preliminary resource allocation based on received CSI reports before actual data transmission. By pre-allocation based on current channel state, the system avoids the need for complex real-time adjustments during transmission, maintaining both simplicity and reliability.
2Productivity
If transmissions are performed without fast feedback mechanism, then processing resources are used efficiently, but latency increases due to failed transmissions and retransmissions
Solution Approach 1:
The patent introduces fast feedback through CSI reports sent from receiving UE to base station. This enables the base station to quickly identify deteriorated channel conditions and reallocate resources before transmission failures occur, reducing retransmission delays while maintaining processing efficiency.
Solution Approach 2:
The system performs preliminary channel quality assessment using CSI reports before data transmission. This preliminary action allows proactive resource management, preventing failed transmissions rather than reacting to them, thus reducing latency without compromising processing efficiency.
3Reliability
If additional resource requests are transmitted for every channel state change, then resource allocation accuracy improves, but network overhead increases
Solution Approach 1:
The patent changes the parameter of resource request triggering from continuous to event-driven. Resource requests are transmitted only when channel state changes exceed a threshold or when CSI reports indicate significant deterioration, maintaining allocation accuracy while reducing unnecessary signaling overhead.
Solution Approach 2:
Instead of requesting resources for every minor channel variation, the system applies partial action by triggering resource requests only when necessary (significant channel changes). This selective approach maintains allocation accuracy where needed while minimizing network overhead in stable conditions.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may receive, from a second UE on a sidelink channel, an indicator of a state of the sidelink channel. Accordingly, the first UE may transmit, to a base station, a request for an additional resource for the sidelink channel, based at least in part on determining that the indicator of the state of the sidelink channel satisfies a condition. For example, the first UE may determine that a modulation and coding scheme (MCS) supported by a current resource for the sidelink channel is outside a range of MCSs granted by the base station. In some aspects, the request may include a negative-acknowledgement (NACK) signal, and the first UE may also transmit a scheduling request for transmitting the indicator of the state of the sidelink channel Numerous other aspects are provided.