Early Data Transmission Payload Enhancement via MCS Index Mapping
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in enhancing early data transmission efficiency, especially for machine-type communications, where conventional methods limit the payload size and resource allocation during the random access procedure, restricting the ability to transmit additional data beyond the standard payload.
Innovation Solution
The method involves signaling information in a System Information Block (SIB) to allow User Equipment (UE) to interpret and adjust the random access response grant, enabling increased transport block sizes and resource units for the connection request message (Msg3) during the random access procedure, thereby facilitating early data transmission by modifying the existing table entries and using reserved MCS indices for additional transport block sizes and resource units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional random access response grant interpretation is used, then standard payload transmission is maintained, but early data transmission efficiency is limited
Solution Approach 1:
The patent changes the interpretation parameters of the random access response grant by introducing a new table that maps MCS indices to increased transport block sizes and resource units. This parameter change allows the system to transmit larger payloads during early data transmission while maintaining compatibility with existing grant structures.
Solution Approach 2:
The patent introduces dynamic adaptability by allowing the UE to determine transport block sizes and resource units based on the received MCS index according to the new table. This dynamic interpretation enables flexible payload size adjustment during early data transmission, optimizing both efficiency and capacity based on actual transmission needs.
2Quantity of substance
If transport block size is increased for early data transmission, then payload capacity is improved, but resource allocation complexity increases
Solution Approach 1:
The patent makes the existing MCS index field serve multiple functions: it continues to indicate modulation and coding scheme while simultaneously serving as an index to select transport block size and resource unit allocations from the new table. This multi-functionality increases payload capacity without adding separate signaling fields, thereby managing resource allocation complexity.
Solution Approach 2:
The patent pre-configures the mapping table between MCS indices and transport block sizes/resource units before transmission. This preliminary action allows the UE to directly determine resource allocations based on the received MCS index without requiring complex real-time calculations, simplifying the resource allocation process while supporting increased transport block sizes.
3Adaptability or versatility
If reserved MCS indices are utilized for additional transport block sizes, then payload flexibility is enhanced, but interpretation complexity increases
Solution Approach 1:
The patent enables the UE to self-determine transport block sizes and resource units by using the received MCS index to look up values in the pre-configured table. This self-service approach allows the UE to autonomously adapt payload parameters without additional network signaling or complex joint decision-making, enhancing payload flexibility while managing interpretation complexity through standardized procedures.
Data Source
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AI summary
Various features presented herein facilitate early data transmission (EDT) in eMTC and NB-IoT. In certain aspects, a UE (e.g., an eMTC and/or NB-IoT type device), may receive an indication in a SIB from a base station that may enable EDT by the UE. The UE may transmit a random access request based on the SIB. The UE may further receive an MCS index in an RAR, and transmit a connection request (e.g., Msg3) to the base station based on the MCS index and the indication in the SIB. Some aspects described herein relate to an improved rate matching technique. In certain aspects, a UE may be configured to transmit a connection request message to a base station based on at least one of an increased number of RVs than a number of RVs for other transmissions from the UE or rate matching performed across more than one subframe.