Sidelink Semi-Persistent Scheduling Configured Grant Pair Activation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in sidelink communications, particularly in semi-persistent scheduling (SPS) configurations, where existing methods require excessive control overhead and lack a mechanism for activating or deactivating semi-static sidelink resource allocations, leading to increased latency and signaling overhead.
Innovation Solution
The implementation of a configured grant pair configuration by a base station to indicate sidelink SPS resource allocation, allowing UEs to determine activation or deactivation without additional control information, with indications of transmitter and receiver roles within the grants, reducing the need for extra DCIs and SCIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional dynamic scheduling is used for sidelink communications, then flexibility in resource allocation is improved, but control overhead and signaling latency increase
Solution Approach 1:
The base station pre-configures grant pairs with resource allocation parameters before sidelink communications occur. This preliminary configuration includes time-frequency resources, modulation schemes, and other transmission parameters, allowing UEs to immediately activate resources without real-time signaling when data needs to be transmitted, thus reducing signaling latency while maintaining allocation flexibility.
Solution Approach 2:
The patent implements a hybrid approach where grant pairs are pre-configured statically but can be dynamically activated or deactivated through simple DCI messages. This allows the system to switch between static resource allocation (for low latency) and dynamic control (for flexibility), optimizing both adaptability and response time based on traffic conditions.
2Productivity
If semi-persistent scheduling is implemented without activation/deactivation mechanisms, then resource allocation efficiency is improved, but control overhead increases due to additional DCIs and SCIs
Solution Approach 1:
The patent extracts the activation and deactivation functions from traditional dynamic scheduling DCIs and integrates them into a simplified grant pair configuration mechanism. By separating the resource allocation configuration (done once) from the activation control (done through compact DCI formats), the system reduces overall control overhead while maintaining resource allocation efficiency.
Solution Approach 2:
The grant pair configuration serves multiple functions: it defines resource allocation parameters, enables semi-persistent scheduling, and provides activation/deactivation control all through a unified mechanism. This multi-functionality eliminates the need for separate DCI and SCI messages, reducing control overhead while maintaining efficient resource utilization.
3Reliability
If configured grant pairs are transmitted to both UEs, then sidelink communication reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent merges the configuration information for both transmitting and receiving UEs into a single grant pair configuration message from the base station. Both UEs receive identical resource allocation parameters simultaneously, ensuring they are synchronized without requiring separate signaling exchanges, thus improving reliability while minimizing overhead.
Solution Approach 2:
The base station performs preliminary configuration of grant pairs for both UEs before sidelink communication begins. This advance configuration ensures both UEs have the necessary resource allocation information ready, eliminating the need for real-time negotiation or confirmation messages during actual data transmission, thereby improving reliability without increasing ongoing signaling overhead.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may send coupled configured grants to a transmitter user equipment (UE) and a receiver UE, respectively. For example, when transmitting a pair of configured grants that includes a first configured grant sent to a first UE and a second configured grant sent to a second UE, the base station may include an indication in each of the configured grants that sidelink semi-persistent scheduling resources are activated or deactivated. Additionally, the configured grants may indicate which UE is a receiver and which UE is a transmitter. For instance, the first configured grant may indicate that a first UE is to be the transmitter and a second configured grant indicate that a second UE is to be the receiver.