Base Station MAC RAR Field Sizing for NR and NR-U Cells
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Solution Overview
Problem
Current base station apparatuses face challenges in efficiently managing communication in both New Radio (NR) and NR-unlicensed (NR-U) cells, particularly in setting optimal sizes for timing advance command (TAC) and uplink grant fields in medium access control random access responses (MAC RARs), which affects communication efficiency.
Innovation Solution
A base station apparatus and method that adjusts the size of the TAC field and uplink grant in MAC RARs based on whether they are transmitted in an NR or NR-U cell, with specific configurations for each to optimize communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the TAC field size is increased and UL grant size is decreased in NR cells, then timing accuracy is improved, but the message size increases and uplink resource allocation flexibility is reduced
Solution Approach 1:
The patent applies different field size configurations for TAC and UL grant in NR cells versus NR-U cells. In NR cells, the TAC field is configured with a larger size (first size) to provide higher timing accuracy, while the UL grant field is configured with a smaller size (second size). This local differentiation of field qualities resolves the contradiction by optimizing each field's size according to its specific functional requirements rather than using a uniform configuration.
2Measurement precision
If the TAC field size is increased in NR cells, then timing advance command precision is improved, but the overall MAC RAR message size increases
Solution Approach 1:
The patent changes the parameters (field sizes) of the MAC RAR message based on the cell type. For NR cells, it sets the TAC field to a first size and UL grant to a second size, while for NR-U cells, it sets them to different sizes (third and fourth sizes respectively). This parameter adaptation allows the system to optimize timing advance command precision in NR cells while managing the overall message size through complementary adjustments in other fields.
3Quantity of substance
If the UL grant size is decreased to accommodate larger TAC field, then message size is controlled, but uplink resource allocation flexibility is reduced
Solution Approach 1:
The patent applies different field size configurations for TAC and UL grant in NR cells versus NR-U cells. In NR cells, the TAC field is configured with a larger size (first size) to provide higher timing accuracy, while the UL grant field is configured with a smaller size (second size). This local differentiation of field qualities resolves the contradiction by optimizing each field's size according to its specific functional requirements rather than using a uniform configuration.
Data Source
AI summary
To perform communication efficiently. Provided are a receiver configured to receive a random access preamble and a transmitter configured to transmit one or multiple medium access control random access responses (MAC RARs) corresponding to the random access preamble. The transmitter sets, in a case that a MAC RAR of the one or multiple MAC RARs is transmitted in a new radio access technology (NR) cell, a timing advance command (TAC) field included in the MAC RAR to have a first size and an uplink (UL) grant to have a second size, and sets. in a case that a MAC RAR of the one or multiple MAC RARs is transmitted in an NR-unlicensed (NR-U) cell, a size of the TAC field included in the MAC RAR to be smaller than the first size and a size of the UL grant to be greater than the second size.