Multi-Slot Grant Time Gaps for Uplink Flexibility
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Solution Overview
Problem
Current wireless communication systems face limitations in flexibility due to multi-slot grants, which can restrict uplink transmissions needed for ultra-reliable low-latency communications, especially in higher frequency bands with short slot lengths, where phase noise is a concern.
Innovation Solution
Incorporating time gaps in multi-slot grants allows for communication of one type to occur during a grant intended for another type, enabling uplink communications in downlink grants or control communications in data communication slots, by transmitting information that indicates specific time gaps within the multi-slot grants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-slot grants are used for downlink communication, then spectral efficiency is improved, but uplink transmission flexibility is reduced
Solution Approach 1:
The multi-slot grant is segmented into multiple slots with different communication directions. Each slot can be independently configured as downlink or uplink, allowing the system to maintain efficient multi-slot downlink grants while inserting specific uplink slots when needed. This segmentation resolves the contradiction by dividing the grant structure into flexible time segments.
Solution Approach 2:
The patent introduces dynamic slot direction configuration within multi-slot grants, where the direction (uplink or downlink) of each slot can be dynamically adjusted based on communication needs. This dynamic adaptability allows the system to optimize spectral efficiency for downlink while preserving uplink transmission flexibility when required.
2Speed
If slot length is reduced for higher frequency bands, then transmission speed is improved, but phase noise impact increases
Solution Approach 1:
The patent employs periodic slot structures with configured time gaps within multi-slot grants. These periodic patterns allow for systematic phase noise compensation by creating regular intervals where reference signals can be transmitted and processed, maintaining reliability despite short slot lengths required for high-speed transmission in higher frequency bands.
Solution Approach 2:
The patent incorporates time gaps and guard periods in advance within the multi-slot grant structure to cushion against phase noise effects. These pre-configured intervals provide buffer zones that protect against phase noise accumulation, allowing short slots to be used for high-speed transmission while maintaining signal integrity through beforehand protective measures.
3Adaptability or versatility
If time gaps are added in multi-slot grants, then communication flexibility is improved, but grant structure complexity increases
Solution Approach 1:
The patent manages grant structure complexity by systematically varying parameters such as time gap positions, durations, and frequencies within predefined ranges. Rather than creating complex structural variations, the solution changes numerical parameters of the grant structure, which simplifies configuration and management while still achieving enhanced communication flexibility through diverse time gap patterns.
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 multi-slot grant for one of uplink communication or downlink communication. The UE may communicate in the multi-slot grant based at least in part on information that provides an indication of one or more time gaps for the multi-slot grant. Numerous other aspects are provided.