UE eCCA Duration Indication via Timing Parameters
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently conveying the duration of the enhanced clear channel assessment (eCCA) procedure, leading to increased overhead and potential disruptions in mmW communication systems due to differing interference/channel performance environments between transmitting and receiving devices.
Innovation Solution
The proposed solution involves mechanisms for the user equipment (UE) to implicitly indicate the duration of the eCCA procedure based on transmission timings and processing time parameters, using a combination of random numbers and resource configuration, allowing the base station to determine the appropriate duration without explicit encoding, thereby reducing overhead and improving communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If explicit encoding of eCCA duration is used, then duration indication accuracy is improved, but overhead increases
Solution Approach 1:
The patent extracts the eCCA duration indication from explicit encoding and implements it through implicit timing relationships. The duration is derived from the time difference between grant transmission and acknowledgment feedback transmission, eliminating the need for separate explicit duration fields in the grant message, thereby reducing overhead while maintaining indication accuracy.
Solution Approach 2:
The patent introduces timing parameters (grant transmission time, acknowledgment feedback transmission time, processing time) as intermediaries to convey the eCCA duration information. Instead of directly encoding duration, the system uses these timing parameters as mediators that allow the UE to calculate the duration implicitly, reducing message overhead while preserving precision.
2Reliability
If eCCA procedure duration is extended, then channel clearance reliability is improved, but communication latency increases
Solution Approach 1:
The patent implements dynamic adjustment of eCCA procedure duration based on UE capability and channel conditions. The base station determines the processing time parameter according to UE capability and dynamically sets the eCCA duration to be sufficient for reliable channel clearance while minimizing unnecessary delay, allowing the system to adapt between reliability and latency requirements.
Solution Approach 2:
The patent changes the duration parameter of the eCCA procedure based on UE capability parameters and channel conditions. By adjusting the processing time parameter and eCCA duration dynamically rather than using fixed values, the system optimizes the balance between ensuring reliable channel clearance and minimizing communication latency for different scenarios.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a grant scheduling an acknowledgement feedback transmission for the grant. The UE may identify, based at least in part on a first timing associated with the grant, a second timing associated with the acknowledgment feedback transmission, or a combination thereof, a duration for a channel clearance procedure to be performed before transmitting the acknowledgement feedback transmission. The UE may perform the channel clearance procedure using the identified duration. The UE may transmit the acknowledgement feedback transmission based at least in part on a result of the channel clearance procedure.