Aperiodic SRS Transmission via DCI RNTI Scrambling
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Solution Overview
Problem
Current wireless communication systems face limitations in flexibility and efficiency, particularly in the transmission of sounding reference signals (SRS) without an uplink shared channel (UL-SCH) and channel state information (CSI) requests, which hinders improved communication capacity, speed, and flexibility.
Innovation Solution
The implementation of user equipment (UE) and base station apparatuses with reception and transmission circuitry configured to handle aperiodic SRS transmission, where cyclic redundancy check (CRC) bits for downlink control information (DCI) are scrambled by specific radio network temporary identifiers (RNTIs), enabling SRS transmission without UL-SCH and CSI requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If aperiodic SRS transmission is enabled without UL-SCH and CSI requests, then communication flexibility and efficiency are improved, but system complexity increases due to separate DCI formats and RNTI scrambling schemes
Solution Approach 1:
The patent segments the DCI format into two distinct types: DCI format 0_1 for scheduling UL-SCH and triggering CSI reports, and DCI format 0_2 for triggering aperiodic SRS transmission without UL-SCH and CSI requests. This segmentation allows the system to handle different transmission scenarios with dedicated formats, improving efficiency while managing complexity through structured differentiation.
Solution Approach 2:
The patent applies different RNTI scrambling schemes to different DCI formats: C-RNTI or CS-RNTI for DCI format 0_1, and a specific SRS-RNTI for DCI format 0_2. This local quality approach ensures that each DCI format has appropriate identification and scrambling mechanisms tailored to its specific function, enhancing reliability while maintaining systematic organization.
2Speed
If DCI format is used to trigger aperiodic SRS without UL-SCH and CSI requests, then transmission speed is improved, but reliability may be affected due to reduced channel information
Solution Approach 1:
The patent configures SRS transmission parameters in advance through RRC signaling, including frequency domain resources, time domain resources, and spatial relation information. This preliminary configuration ensures that when DCI format 0_2 triggers aperiodic SRS transmission, the UE can immediately execute with pre-established parameters, achieving fast transmission speed while maintaining reliability through pre-validated configurations.
Solution Approach 2:
The patent implements feedback mechanisms where the base station receives SRS transmissions and provides uplink channel quality information back to the UE through RRC signaling or DCI. This feedback loop ensures that even though DCI format 0_2 triggers transmission without UL-SCH and CSI requests, the system maintains reliability by continuously updating channel state information based on SRS measurements.
Data Source
AI summary
A user equipment (UE) is described. The UE includes reception circuitry configured to receive downlink control information (DCI) indicating aperiodic sounding reference signal (SRS) transmission without an uplink shared channel (UL-SCH) and without a channel state information (CSI) request. The UE also includes transmission circuitry configured to transmit sounding reference signals. A cyclic redundancy check (CRC) bit for a first DCI indicating aperiodic SRS transmission for scheduling UL-SCH and/or triggering a CSI report is scrambled by a first radio network temporary identifier (RNTI). A CRC bit for the first DCI indicating aperiodic SRS transmission without an UL-SCH and without a CSI request is scrambled by a second RNTI.