Terminal Uplink Grant Redundancy Version Determination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LTE communication systems face inefficiencies in transmitting uplink data due to limitations in scheduling and grant management, particularly in dynamically and semi-persistently scheduled transmissions.
Innovation Solution
The solution involves a terminal and base station apparatus configured to receive and transmit uplink grants with specific CRC parity bits, enabling multiple transmissions based on these grants and determining redundancy versions for each transmission, optimizing data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semi-persistent scheduling is used for uplink transmissions, then transmission efficiency is improved, but redundancy version determination becomes complex when multiple grants overlap
Solution Approach 1:
The patent applies preliminary action by pre-defining redundancy version determination rules for different grant types. When a terminal receives a first uplink grant (dynamic scheduling) or second uplink grant (semi-persistent scheduling), the redundancy version for subsequent transmissions is determined based on pre-established rules associated with each grant type, avoiding complex real-time decisions during transmission
Solution Approach 2:
The patent segments the uplink grant reception and transmission processes into distinct types: first uplink grants for dynamic scheduling and second uplink grants for semi-persistent scheduling. Each grant type has its own redundancy version determination logic, allowing independent optimization and simplifying the overall system by dividing the complex scheduling problem into manageable segments
2Adaptability or versatility
If multiple uplink grants are received and processed, then transmission flexibility is improved, but scheduling management complexity increases
Solution Approach 1:
The patent implements dynamics by allowing the system to adaptively switch between different scheduling modes (dynamic scheduling via first uplink grants and semi-persistent scheduling via second uplink grants). The terminal can handle multiple grant types simultaneously, with each grant type providing different levels of flexibility and control, enabling the system to dynamically adjust to varying transmission requirements
Solution Approach 2:
The patent uses the uplink grant structure as an intermediary that carries scheduling information from the base station to the terminal. By differentiating between first uplink grants (with C-RNTI) and second uplink grants (with SPS C-RNTI), the system creates clear intermediaries that mediate between the base station's scheduling decisions and the terminal's transmission actions, simplifying the management of multiple grants
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a terminal apparatus configured to: receive, in a first PDCCH, a first uplink grant to which first CRC parity bits scrambled with a C-RNTI for a dynamically scheduled transmission is attached; receive, in a second PDCCH, a second uplink grant to which second CRC parity bits scrambled with SPS C-RNTI for a semi-persistently scheduled transmission is attached; perform multiple transmissions corresponding to a bundle, based on the first uplink grant or the second uplink grant; and determine a redundancy version corresponding to each of the multiple transmissions, excluding a first transmission of the multiple transmissions, based at least on whether the bundle is associated with the second uplink grant.