UE Capability Signaling via TBS and TTI Parameters
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Solution Overview
Problem
Current wireless communication systems, particularly in the context of new radio access technology (NR), face challenges in efficiently signaling user equipment (UE) capabilities due to limitations in beamforming techniques, such as analog beamforming's inability to perform frequency-selective beamforming and hybrid beamforming's restricted beam direction capabilities, which impact cost-effectiveness and system performance.
Innovation Solution
A method and apparatus for signaling UE capabilities in a wireless communication system that determines a UE category based on transport block size (TBS) and transmission time interval (TTI), allowing for efficient operation of NR by transmitting these parameters to the network, enabling flexible bandwidth support and various numerologies to optimize system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If analog beamforming is used to reduce cost, then the number of transceiver units is reduced, but frequency-selective beamforming capability is lost
Solution Approach 1:
The patent combines digital beamforming and analog beamforming into a hybrid architecture. Digital beamforming provides frequency-selective capability while analog beamforming reduces cost through fewer transceiver units. The hybrid system merges these approaches to achieve both objectives simultaneously.
Solution Approach 2:
The patent applies different beamforming approaches to different parts of the system. Digital beamforming is applied where frequency-selective capability is needed, while analog beamforming is used in other areas to reduce cost. This local differentiation resolves the contradiction between cost and capability.
2Ease of manufacture
If hybrid beamforming with B transceiver units is used, then cost is reduced compared to full digital beamforming, but the number of simultaneously transmittable beam directions is limited to B or less
Solution Approach 1:
The patent introduces dynamic beam direction indication through the SRI field, allowing the system to adaptively select and switch between different beam directions based on channel conditions and service requirements. This dynamic capability compensates for the limited number of simultaneous beams in hybrid beamforming.
Solution Approach 2:
The patent extends the beamforming capability by adding temporal and spatial dimensions through dynamic beam indication and multi-antenna port operations. This allows the system to achieve effective multi-directional coverage despite having limited simultaneous physical beams.
3Productivity
If UE capability signaling includes detailed TBS and TTI parameters, then NR operation efficiency is improved, but signaling complexity increases
Solution Approach 1:
The patent signals only the essential TBS and TTI parameters needed for efficient NR operation, rather than all possible UE capability details. This partial signaling approach achieves the necessary optimization while limiting signaling overhead and complexity.
Solution Approach 2:
The patent uses parameter scaling and normalization techniques to represent TBS and TTI capabilities in a compact form. By changing the representation parameters, the system conveys detailed capability information with reduced signaling bits.
Data Source
AI summary
A method and apparatus for transmitting a user equipment (UE) capability for new radio access technology (NR) in a wireless communication system is provided. A user equipment (UE) determines a UE category based on at least a transport block size (TBS) value and a transmission time interval (TTI), and transmits the UE capability including at least the TBS value and the TTI to a network.