Sidelink Feedback Power Allocation for V2X Unicast and Groupcast
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Solution Overview
Problem
LTE V2X only supports broadcast services and lacks support for HARQ-ACK and CSI feedback, which is crucial for unicast and groupcast services in NR V2X that require higher data rates, reliability, and low latency.
Innovation Solution
The method involves a second device receiving data information and/or a reference signal from a first device, determining the priority of second data information and/or feedback information, allocating power based on the priority, and transmitting the allocated information to the first device. Additionally, the second device scrambles and/or indicates feedback information using an identifier to differentiate between multiple unicast or groupcast sessions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE V2X uses broadcast services only, then implementation is simple, but it cannot support unicast and groupcast services requiring high data rates and reliability
Solution Approach 1:
The patent segments the feedback information into two distinct types: HARQ-ACK feedback for unicast services and CSI feedback for groupcast services. This segmentation allows the system to support multiple service types (broadcast, unicast, groupcast) while managing complexity by treating each feedback type with appropriate processing rules and priority levels.
Solution Approach 2:
The patent introduces dynamic priority determination for feedback information based on service type, QoS requirements, and channel conditions. The priority of HARQ-ACK and CSI feedback can be dynamically adjusted, allowing the system to adapt to varying service demands and maintain high reliability for critical services while managing overall system complexity.
2Adaptability or versatility
If multiple unicast and groupcast sessions are supported simultaneously, then service versatility improves, but interference and confusion between sessions increase
Solution Approach 1:
The patent applies local quality by assigning different priority levels and processing rules to feedback information from different sessions and service types. Each unicast and groupcast session can have its feedback prioritized independently based on local requirements, allowing the system to manage multiple sessions simultaneously while minimizing interference through differentiated handling.
Solution Approach 2:
The patent introduces an intermediary priority determination mechanism that mediates between multiple concurrent sessions. This intermediary layer processes feedback from different sessions, assigns appropriate priorities, and schedules transmissions to avoid conflicts and interference, enabling versatile multi-session support while maintaining system order.
3Reliability
If HARQ-ACK and CSI feedback are transmitted with high priority, then transmission reliability improves, but power consumption increases
Solution Approach 1:
The patent changes the parameter of feedback priority dynamically based on service type and channel conditions. HARQ-ACK feedback for unicast services and CSI feedback for groupcast services can have their priorities adjusted according to current QoS requirements and channel state, allowing the system to maintain high reliability when needed while reducing power consumption during less critical transmission periods.
Data Source
AI summary
An apparatus for transmitting sidelink information, configured in a second device, includes: a receiver configured to receive first data information from a first device; processor circuitry configured to: determine a first priority of sidelink feedback information for the first data information, determine power for the sidelink feedback information according to the first priority; and a transmitter configured to transmit to the first device the sidelink feedback information being determined with the power, wherein the sidelink feedback information comprises sidelink hybrid automatic repeat request acknowledgement information indicating whether to retransmit the first data information.