Multi-TTI Grant Structure for Wireless Resource Allocation
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Solution Overview
Problem
Conventional wireless communication systems face inefficiencies in managing grants over multiple transmission time intervals (TTIs), leading to increased overhead and potential loss of transmission medium in unlicensed spectrums due to frequent contention-based procedures and limited space for uplink grants.
Innovation Solution
The implementation of multi-TTI grants that allocate resources for multiple transport blocks across multiple TTIs, including both base and extended grants, which can be transmitted simultaneously or separately, with varying parameters indicated through specific identifiers and associations to optimize resource allocation and reduce overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an uplink grant is transmitted for each TTI, then the UE can receive resource allocation information, but the control overhead increases and transmission medium loss increases
Solution Approach 1:
The patent combines multiple uplink grants for multiple TTIs into a single multi-TTI grant structure. The base station transmits one grant that allocates resources across multiple TTIs instead of transmitting separate grants for each TTI, thereby reducing control overhead while maintaining reliable resource allocation information delivery to the UE.
Solution Approach 2:
The patent implements preliminary action by transmitting a multi-TTI grant that pre-allocates resources for multiple future TTIs in advance. The grant includes indications of resource allocations for multiple TTIs, allowing the UE to prepare for upcoming transmissions without waiting for individual grants for each TTI, thus reducing latency and overhead.
2Device complexity
If a multi-TTI grant is transmitted, then control overhead is reduced, but the base station must manage varying parameters across multiple TTIs
Solution Approach 1:
The patent segments the multi-TTI grant into a base grant and one or more extended grants. The base grant contains common parameters applicable to all TTIs, while extended grants provide additional or modified parameters for specific TTIs. This segmentation allows efficient management of varying parameters across multiple TTIs while maintaining low control overhead through hierarchical organization.
Solution Approach 2:
The patent implements dynamics by allowing parameters such as resource allocation, HARQ identifier, and other transmission parameters to vary across different TTIs within the multi-TTI grant. The base station can dynamically adjust these parameters through the extended grant mechanism, providing adaptability to changing transmission conditions while maintaining the benefits of consolidated grant structure.
3Ease of operation
If contention-based procedures are performed frequently in unlicensed spectrums, then the base station can allocate resources, but the transmission medium is lost
Solution Approach 1:
The patent applies preliminary action by having the base station perform contention-based procedures (such as LBT) in advance before transmitting the multi-TTI grant. By completing the contention process beforehand and securing the transmission medium, the base station can then transmit the grant and subsequent data without repeated interruptions, reducing transmission medium loss while maintaining resource allocation capability.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A wireless communications system may support grants for uplink or downlink transmission over multiple transmission time intervals (TTIs). A multi-TTI grant may include a base grant and an extended grant that include separate information and may be transmitted simultaneously (e.g., within the same TTI) or separately. A grant type (e.g., whether a grant is a base grant or an extended grant) or an association between a base grant and an extended grant may be conveyed (e.g., via the multi-TTI grant). A downlink assignment index (DAI) may be included for one or more TTIs subject to the multi-TTI. For instance, DAI may be included for each TTI or for a subset of TTIs.