Uplink Channel Access via Sensing Beam COT Sharing
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Solution Overview
Problem
In the context of 5G wireless communication systems, there is a need to efficiently transmit and receive signals in unlicensed bands, particularly in scenarios where channel occupancy time (COT) sharing is available but not effectively utilized due to lack of information about the sensing beam used by the receiving end.
Innovation Solution
The proposed method involves a user equipment (UE) receiving information related to a sensing beam used by a base station (BS) to initiate a COT, and determining whether COT sharing is available based on a quasi co-location (QCL) relationship between the sensing beam and the uplink transmission. The UE then performs channel access procedures (CAP) accordingly, either using Type 1 CAP with backoff when COT sharing is not available, or Type 2 CAP without backoff when it is available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs Type 1 CAP with backoff for every uplink transmission, then channel access reliability is improved, but transmission delay increases and productivity decreases
Solution Approach 1:
The base station performs channel sensing and COT acquisition in advance before uplink transmission. The UE can then share the acquired COT without performing its own Type 1 CAP, reducing transmission delay while maintaining reliability through the BS's preliminary channel access action.
Solution Approach 2:
The base station acts as an intermediary that performs channel sensing and COT acquisition on behalf of the UE. The BS transmits the sensed COT information to the UE, allowing the UE to transmit uplink signals within the shared COT without performing independent channel access, thus improving transmission efficiency.
2Speed
If the UE shares COT without beam information, then transmission speed increases, but transmission reliability deteriorates due to incorrect beam selection
Solution Approach 1:
The base station provides feedback information about the sensing beam used for COT acquisition to the UE. This beam information enables the UE to correctly select the beam for uplink transmission within the shared COT, ensuring both fast transmission and reliable beam selection through information feedback.
Solution Approach 2:
The base station preliminarily determines and communicates the sensing beam information before the UE performs uplink transmission. This preliminary provision of beam information allows the UE to immediately use the correct beam without performing additional beam selection procedures, achieving both speed and reliability.
3Measurement precision
If the UE performs full Type 1 CAP procedure, then channel access accuracy is improved, but time consumption increases
Solution Approach 1:
The base station performs channel sensing and acts as an intermediary that provides COT sharing information to the UE. The UE can then transmit within the shared COT without performing the full Type 1 CAP procedure, reducing channel access time while maintaining accuracy through the BS's sensing results.
Solution Approach 2:
The base station performs preliminary channel sensing and COT acquisition before the UE needs to transmit. This preliminary action provides the UE with accurate channel access information without requiring the UE to perform its own time-consuming Type 1 CAP procedure.
Data Source
AI summary
Disclosed is a method for a terminal to perform uplink (UL) transmission in a wireless communication system. In particular, the method comprises the steps in which a base station: receives information related to a sensing beam used for initiating channel occupancy time (COT); determines, on the basis of a quasi co-located (QCL) relationship between the sensing beam and the UL transmission, whether COT sharing is available; on the basis that the COT sharing is not available, senses a channel corresponding to the UL transmission on the basis of a type 1 channel access procedure (CAP) and performs the UL transmission on the basis of the channel being sensed as IDLE; and on the basis that the COT sharing is available, senses the channel on the basis of a type 2 CAP and performs the UL transmission within the COT on the basis of the channel being sensed as IDLE.