Radio Terminal Grant-less Transmission Session Identifier
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Solution Overview
Problem
In mobile communication systems, the inefficiency arises when both grant-based and grant-less communication schemes are used, leading to suboptimal resource allocation and increased effort in requesting radio resources, especially when the amount of information exchanged is small, necessitating a method to improve communication efficiency by selectively switching between these schemes.
Innovation Solution
A radio terminal apparatus and base station apparatus that can dynamically switch between grant-based and grant-less communication schemes by using a session identifier for connection management, error detection, and resource allocation, allowing efficient data transmission and retransmission based on the scheme used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If grant-based scheme is used for data transmission, then reliability of resource allocation is improved, but communication overhead and time consumption increase for small data transmissions
Solution Approach 1:
The patent implements dynamic scheme selection that adapts to different operational states. The system transitions between grant-based and grant-less schemes based on whether the terminal is in connected or idle state, making the resource allocation mechanism flexible rather than static. This resolves the contradiction by using grant-based scheme (reliable) when connected and grant-less scheme (fast) when idle/resuming.
Solution Approach 2:
The patent changes the operational parameters of the communication scheme based on system state. When resuming from idle state, the system switches to grant-less scheme with simplified procedures (no scheduling request, no uplink grant needed), effectively changing parameters like overhead size and transmission time. This allows optimal parameter selection for each state, resolving the time-reliability tradeoff.
2Loss of substance
If grant-less communication scheme is used, then communication overhead is reduced, but system complexity increases when supporting both schemes
Solution Approach 1:
The patent segments the communication system into distinct operational modes (connected state and idle state) with different scheme requirements. By dividing the system operation into these segments, each with its own optimized scheme, the overall complexity is managed through clear state boundaries and transition rules, rather than attempting to support both schemes simultaneously in all conditions.
Solution Approach 2:
The patent implements dynamic scheme selection that adapts to different operational states. The system transitions between grant-based and grant-less schemes based on whether the terminal is in connected or idle state, making the resource allocation mechanism flexible rather than static. This resolves the contradiction by using grant-based scheme (reliable) when connected and grant-less scheme (fast) when idle/resuming.
3Productivity
If connection is maintained in connected state, then resource allocation efficiency is improved, but power consumption increases for idle terminals
Solution Approach 1:
The patent implements dynamic state transitions between connected and idle states based on communication activity. When no data transmission is needed, the system transitions to idle state with halted connection, reducing power consumption. When data needs to be transmitted, the system can resume connection using grant-less scheme, dynamically adapting to balance power efficiency and resource allocation needs.
4Reliability
If procedure for requesting radio resources is implemented, then resource allocation control is improved, but time consumption and overhead increase for small data amounts
Solution Approach 1:
The patent applies partial action by implementing a simplified resource allocation procedure for specific conditions. When resuming from idle state, the system uses grant-less scheme with minimal procedures (transmitting only data and connection identifier without full scheduling requests), providing just enough resource allocation control needed for the specific scenario rather than full control procedures.
Data Source
AI summary
Communication efficiency is improved in a case of using a grant-less communication scheme and a grant-based scheme. A radio terminal apparatus for communicating with a radio base station apparatus, which includes a transmitter configured to transmit a signal to the radio base station apparatus, a receiver configured to receive a signal from the radio base station, and a controller configured to control the transmitter and the receiver. The controller is capable of selecting both a grant-based scheme and a grant-less communication scheme to transmit user data. In a case of transmitting the user data by using the grant-less communication scheme and adding a session identifier for identifying the radio terminal apparatus, a transmission of at least two parts that include a first part including the session identifier and a second part including the user data is performed at a time. First information for detecting an error in receiving the first part and second information for detecting an error in receiving the second part are added at the time of the transmission, regardless of the error in receiving the second part, and an amount of the first information and an amount of the second information are different from each other.