Dedicated PUCCH Resource Set for Uplink Control Information in Small Data Transmission
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) without a dedicated physical uplink control channel (PUCCH) resource set cannot transmit uplink control information (UCI) during mobile originated small data transmission (MT-SDT) operations, inhibiting link adaptation and impacting network and device performance.
Innovation Solution
Configuring a dedicated PUCCH resource set for UE, allowing the transmission of UCI during MT-SDT operations, which facilitates link adaptation and improves latency, reliability, and power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If UE operates in RRC inactive or idle state for small data transmission, then power consumption is reduced and latency is lowered, but the UE cannot transmit uplink control information (UCI) during SDT operations
Solution Approach 1:
The PUCCH resources are segmented into multiple resource sets (first PUCCH resource set and second PUCCH resource set) with different configurations. The first set is used for initial UCI transmission during SDT, while the second set is used for subsequent UCI transmission after RRC connection restoration, allowing the system to maintain low latency during SDT while ensuring reliable UCI transmission capability through proper resource allocation across different states.
2Reliability
If dedicated PUCCH resource set is configured for UE during SDT, then UCI transmission capability is improved, but device complexity increases
Solution Approach 1:
The network configures the first PUCCH resource set in advance before the UE enters RRC inactive state for SDT operations. This preliminary configuration allows the UE to immediately transmit UCI without additional signaling overhead during SDT, reducing the perceived complexity at the UE side while maintaining reliable UCI transmission capability when needed.
Solution Approach 2:
The system dynamically switches between different PUCCH resource sets based on the UE's operational state. The first PUCCH resource set is activated during SDT operations in RRC inactive state, while the second PUCCH resource set is used after RRC connection restoration. This dynamic resource allocation optimizes the balance between reliability and complexity by only activating the necessary resource set for the current operational phase.
3Reliability
If UE transmits UCI during MT-SDT operations, then link adaptation is improved, but energy consumption increases
Solution Approach 1:
UCI transmission is performed periodically based on the SDT operation phases rather than continuously. The UE transmits UCI using the first PUCCH resource set during SDT operations when link adaptation is critical, and switches to the second PUCCH resource set after connection restoration. This periodic transmission approach maintains necessary link adaptation capability while minimizing energy consumption by avoiding continuous UCI transmission.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a first downlink communication associated with a small data transmission (SDT) operation, the first downlink communication indicating a dedicated physical uplink control channel (PUCCH) resource set. The UE may receive a second downlink communication during the SDT operation, the second downlink communication comprising at least one of an SDT communication or a non-SDT communication, the non-SDT communication being received during a radio resource control (RRC) inactive state associated with the UE or an RRC idle state associated with the UE. The UE may transmit, using the dedicated PUCCH resource set, uplink control information (UCI) associated with the second downlink communication. Numerous other aspects are described.