Small Data Transmission TBS MCS Configuration for 5G Random Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting small data transmissions during random access procedures in 5G New Radio (NR) systems, particularly in indicating transport block size (TBS) and modulation and coding scheme (MCS) for Msg3 and MsgA PUSCH transmissions, and in implementing a fallback mechanism for small data transmission (SDT) to ensure successful decoding and resource allocation.
Innovation Solution
The proposed solution involves configuring TBS and MCS values for Msg3 and MsgA PUSCH transmissions through higher-layer signaling, allowing for flexible resource allocation and fallback mechanisms to ensure successful decoding and efficient data transmission, even in congested conditions or when the gNB fails to decode MsgA PUSCH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If small data transmission is implemented during random access procedure, then data transmission delay is reduced, but device complexity increases due to TBS and MCS indication requirements
Solution Approach 1:
The gNB pre-configures TBS and MCS values for Msg3 and MsgA PUSCH transmissions through higher-layer signaling before the actual random access procedure. This preliminary configuration enables the UE to directly use these pre-determined parameters during transmission, eliminating the need for complex real-time calculations and indications at the receiver, thus reducing receiver complexity while enabling efficient small data transmission
Solution Approach 2:
The patent changes the approach from dynamic TBS and MCS indication to using pre-configured parameter sets. By transforming the problem from real-time parameter determination to using predetermined parameter configurations, the system achieves faster transmission without increasing receiver complexity
2Productivity
If flexible resource allocation is implemented for Msg3 and MsgA PUSCH transmissions, then productivity is improved, but device complexity increases due to fallback mechanism requirements
Solution Approach 1:
The gNB pre-configures multiple TBS and MCS values along with corresponding resource allocations through higher-layer signaling before the random access procedure. This preliminary setup enables flexible resource allocation during transmission without requiring complex real-time decisions or fallback mechanisms, as all necessary configurations are already prepared and indicated to the UE in advance
3Productivity
If TBS and MCS indication is implemented for Msg3 and MsgA PUSCH transmissions, then productivity is improved, but loss of information increases due to potential decoding failures
Solution Approach 1:
The gNB pre-determines and indicates appropriate TBS and MCS values through higher-layer signaling before the UE performs PUSCH transmission. This preliminary configuration ensures that the UE uses optimal transmission parameters from the start, reducing the likelihood of decoding failures and eliminating the need for retransmissions, thus improving productivity while minimizing information loss
Data Source
AI summary
Various embodiments may relate to small data transmission (SDT), which is also referred to herein as “early data transmission (EDT).” In particular, some embodiments disclosed herein include an indication of transport block size (TBS) and/or modulation and coding scheme (MCS) for Msg3 and/or MsgA PUSCH transmissions, and/or an indication of a fallback mechanism for SDT.