Aperiodic SRS Transmission Control via Msg3 Detection
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Solution Overview
Problem
In wireless communication systems, particularly in E-UTRAN networks, there is uncertainty regarding the transmission of aperiodic SRS, leading to challenges in determining whether the PUSCH is rate-matched, which affects the eNB's ability to decode PUSCH correctly, especially when Msg3 is transmitted within a UE-specific aperiodic SRS subframe.
Innovation Solution
Configuring UE to transmit PUSCH on the last SC-FDMA symbol in a UE-specific aperiodic SRS subframe if Msg3 is present, and not transmitting on that symbol if Msg3 is absent, thereby ensuring consistent rate-matching and avoiding blind decoding by the eNB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If aperiodic SRS transmission is configured in UE-specific subframes, then channel sounding capability is improved, but uncertainty in PUSCH rate-matching occurs affecting eNB decoding
Solution Approach 1:
The patent applies dynamics by making the SRS transmission behavior adaptive based on the presence of Msg3. When Msg3 is detected in the PUSCH, the UE transmits SRS on the last SC-FDMA symbol; when Msg3 is absent, the UE does not transmit SRS. This dynamic adjustment resolves the contradiction by allowing channel sounding only when it does not interfere with Msg3 transmission, thereby maintaining both sounding capability and decoding reliability.
Solution Approach 2:
The patent changes the transmission parameter (SRS presence) based on the message type being transmitted. By detecting whether Msg3 is present in the PUSCH and adjusting SRS transmission accordingly, the system dynamically modifies the parameter to avoid rate-matching uncertainty, thus resolving the contradiction between maintaining sounding capability and ensuring reliable decoding.
2Productivity
If PUSCH is transmitted on the last SC-FDMA symbol in aperiodic SRS subframe, then uplink data transmission continuity is improved, but rate-matching uncertainty increases affecting eNB decoding
Solution Approach 1:
The patent applies preliminary action by having the UE detect the presence of Msg3 before transmitting PUSCH on the last SC-FDMA symbol. This advance detection allows the UE to determine whether SRS transmission should occur, eliminating rate-matching uncertainty at the eNB side and simplifying the decoding process while maintaining transmission continuity.
Solution Approach 2:
The patent uses feedback mechanisms where the UE monitors for Msg3 presence and adjusts its SRS transmission behavior accordingly. This feedback loop ensures that the eNB can reliably determine whether rate-matching is applied, reducing decoding complexity while maintaining uplink transmission continuity.
3Adaptability or versatility
If aperiodic SRS is configured without Msg3 checking, then SRS transmission flexibility is improved, but decoding uncertainty at eNB increases
Solution Approach 1:
The patent introduces Msg3 presence detection as an intermediary condition that mediates between SRS transmission flexibility and rate-matching information availability. By using Msg3 detection as the deciding factor, the system maintains SRS flexibility while ensuring that the eNB has the necessary information to correctly perform rate-matching and decode PUSCH.
Data Source
AI summary
A method and apparatus are disclosed for aperiodic SRS improvement. In one embodiment, the method comprises configuring a UE (User Equipment) with aperiodic SRS. The method also comprises transmitting a PUSCH (Physical Uplink Shared Channel) on a last SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbol in a UE-specific aperiodic SRS subframe if a Msg3 in the subframe is transmitted on the PUSCH. Furthermore, the method comprises not transmitting a PUSCH on a last SC-FDMA symbol in a UE-specific aperiodic SRS subframe if a Msg3 in the subframe is not transmitted on the PUSCH.