Open Loop Power Control for Multicast Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing acknowledgment feedback for multicast transmissions, leading to excessive power accumulation and interference, which can impair decoding and increase power consumption.
Innovation Solution
The implementation of open loop feedback power control techniques, where user equipment (UE) identifies and uses specific power control parameters for acknowledgment feedback responsive to multicast transmissions, distinct from those used for unicast transmissions, to optimize resource utilization and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same power control parameter is used for unicast feedback and multicast feedback, then the implementation is simple and unified, but the accumulated power of acknowledgment feedback transmissions from multiple UEs becomes excessively high
Solution Approach 1:
The patent segments the power control parameters into separate configurations for unicast and multicast feedback transmissions. The network device configures first power control parameters for unicast acknowledgment feedback and second power control parameters for multicast acknowledgment feedback, preventing power accumulation from multiple UEs responding to multicast transmissions.
Solution Approach 2:
The patent applies different power control parameters locally according to the feedback transmission type. UEs use the first power control parameters when sending unicast feedback and the second power control parameters when sending multicast feedback, optimizing power levels for each specific scenario rather than using a uniform configuration.
2Device complexity
If the same power control parameter is used for unicast feedback and multicast feedback, then the configuration is unified, but interference increases and decoding performance deteriorates
Solution Approach 1:
The patent divides power control parameters into separate sets for unicast and multicast feedback, allowing independent optimization of each feedback type's power level to minimize interference and improve decoding performance without complicating the overall configuration mechanism.
3Productivity
If multiple UEs transmit acknowledgment feedback using the same resource, then resource utilization is efficient, but power accumulation causes excessive power consumption
Solution Approach 1:
The patent changes the power control parameters based on the feedback transmission type. When UEs transmit multicast feedback using the same resource, they apply the second power control parameters which are specifically configured to prevent excessive power accumulation, thereby reducing overall power consumption while maintaining efficient resource utilization.
Data Source
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AI summary
Methods, systems, and devices for wireless communications are described. In one example, a user equipment (UE) may be configured to receive a control message scheduling a multicast transmission, and the UE may identify an open loop power control parameter for transmitting acknowledgment feedback responsive to the multicast transmission. The identification of the open loop power control parameter may be based on the transmission being multicast to a plurality of UEs, and in some cases a UE may identify an open loop power control parameter that is different than an open loop power control parameter associated with feedback responsive to unicast transmissions. In various examples, open loop power control parameters may correspond to respective feedback resources (e.g., according to a configuration for a set of open loop power control parameters), or to respective physical resource indicators (e.g., as signaled in downlink control information).