Uplink Multi-TTI Scheduling Gap Utilization in TDD Systems
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Solution Overview
Problem
Current cellular communications networks, particularly in TDD systems, face inefficiencies in uplink traffic handling due to fixed subframe allocations and uplink scheduling delays, which limit the maximization of radio resources for uplink transmission.
Innovation Solution
The implementation of a method that allows for the transmission of a second uplink grant during a gap created in radio resources assigned by a previous multi-TTI uplink grant, maximizing uplink radio resources, especially in high uplink traffic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed allocation of uplink and downlink subframes is used, then the system structure is simple and stable, but the uplink radio resources cannot be maximized and spectrum efficiency is limited
Solution Approach 1:
The patent implements dynamic TDD configuration where the network can adaptively change the number and position of uplink and downlink subframes based on traffic conditions. This allows the system to transition from fixed to flexible subframe allocation, maximizing uplink resources during high uplink traffic while maintaining system stability through controlled adaptation mechanisms.
Solution Approach 2:
The patent changes the parameter of subframe allocation from fixed to variable by introducing dynamic TDD configurations. The network can adjust the proportion of uplink subframes (currently limited to max 60% in fixed allocation) based on real-time traffic demands, thereby increasing uplink radio resource utilization without fundamentally changing the system architecture.
2Loss of time
If uplink grants are transmitted in downlink subframes with standard scheduling delay, then the control signaling structure is simple, but uplink transmission delays increase and resource efficiency decreases
Solution Approach 1:
The patent applies preliminary action by transmitting uplink grants earlier in the scheduling process and utilizing gap subframes proactively to reduce delays. The network schedules uplink transmissions in advance and uses gap subframes (subframes where no uplink transmission occurs) to send uplink grants, allowing users to prepare and transmit uplink data sooner, thereby reducing overall uplink scheduling delay and improving transmission efficiency.
3Productivity
If multi-TTI uplink grants assign consecutive subframes without gaps, then the resource allocation is continuous and efficient, but gaps are needed for transmitting subsequent uplink grants
Solution Approach 1:
The patent segments the continuous uplink subframe allocation by introducing gap subframes within the multi-TTI uplink grant structure. These gap subframes are strategically placed to allow transmission of subsequent uplink grants while maintaining overall resource allocation efficiency. The segmentation enables the system to balance continuous resource usage with the need for scheduling flexibility.
Solution Approach 2:
The gap subframes act as intermediaries between consecutive uplink transmission subframes. These intermediary subframes provide the necessary space for transmitting uplink grants without disrupting the overall continuity of uplink resource allocation. The gap subframes mediate between the need for continuous resource allocation and the requirement for scheduling flexibility, allowing both objectives to be achieved simultaneously.
Data Source
AI summary
Systems and methods are disclosed for transmission and reception of an uplink grant during a gap created in radio resources assigned by a previous multiple Transmit Time Interval (multi-TTI) uplink grant in a system operating according to a Time Division Duplexing (TDD) scheme. In one embodiment, a method of operation of a wireless device operating according to a TDD scheme in a cellular communications network includes: receiving a first uplink grant from a radio network node that assigns first radio resources for a first multiple transmit time interval uplink transmission, the first radio resources comprising a set of consecutive subframes; and interrupting an uplink transmission on the first radio resources during a gap in the first radio resources assigned for the first multiple transmit time interval uplink transmission, the gap comprising a time domain gap within the set of consecutive subframes.