Aperiodic Signal Transmission Resource Reservation
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Solution Overview
Problem
Conventional LTE systems do not define methods for aperiodic Zero Power (ZP) CSI-RS transmission and aperiodic Interference Measurement Resource (IMR) transmission, leading to adverse effects on data transmission quality due to the inability of UEs to identify resources for these signals, resulting in inadequate rate matching and increased overhead.
Innovation Solution
A method involving the transmission of reservation information for aperiodic signal resources via higher layer signaling, Downlink Control Information (DCI) indicating specific resources, and the use of these resources for aperiodic Zero Power CSI-RS and IMR transmission, allowing UEs to properly receive and process these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aperiodic ZP CSI-RS and aperiodic IMR transmission are not defined in conventional LTE systems, then device complexity is reduced, but data transmission quality deteriorates due to inadequate rate matching
Solution Approach 1:
The patent applies preliminary action by configuring resource reservations for aperiodic ZP CSI-RS and aperiodic IMR in advance through higher layer signaling (RRC configuration). The base station pre-allocates specific time-frequency resources and notifies UEs of these reservations before actual transmission occurs. This allows UEs to perform rate matching on the reserved resources beforehand, ensuring data transmission quality is maintained when aperiodic signals are transmitted.
2Reliability
If CSI-RS is transmitted periodically to cover entire cell, then CSI-RS coverage is maintained, but overhead increases significantly
Solution Approach 1:
The patent applies local quality by transitioning from cell-wide periodic CSI-RS transmission to UE-specific aperiodic CSI-RS transmission. Instead of transmitting CSI-RS to cover the entire cell periodically, the base station transmits CSI-RS only to specific UEs that need it, at specific times when channel state information is required. This localized approach maintains necessary CSI-RS coverage for active UEs while dramatically reducing overall CSI-RS overhead in the system.
Solution Approach 2:
The patent applies periodic action by replacing periodic CSI-RS transmission with aperiodic transmission triggered by specific events or scheduling decisions. The base station transmits CSI-RS aperiodically based on UE scheduling needs, channel conditions, or specific triggering events rather than following a fixed periodic schedule. This allows the system to maintain CSI-RS coverage only when and where needed, reducing unnecessary transmissions and overhead.
3Measurement precision
If UEs cannot identify resources for aperiodic ZP CSI-RS and aperiodic IMR, then device complexity is reduced, but measurement precision deteriorates due to inability to perform proper rate matching
Solution Approach 1:
The patent applies feedback by implementing a two-way communication mechanism for resource identification. The base station configures resource reservations through higher layer signaling and notifies UEs of these reservations. UEs provide feedback by acknowledging the configured resources and using them for rate matching operations. This feedback loop ensures UEs can accurately identify the resources where aperiodic ZP CSI-RS and aperiodic IMR will be transmitted, enabling precise rate matching without excessive complexity.
Data Source
AI summary
A method of aperiodic signal transmission from a base station (BS) to a user equipment (UE) includes transmitting, from the BS to the UE, reservation information indicating first resources reserved for aperiodic signal transmission via higher layer signaling, transmitting, from the BS to the UE, Downlink Control Information (DCI) indicating at least a second resource to be selected based on the first resources, and transmitting, from the BS to the UE, the aperiodic signals using the first resources.