Uplink MIMO Scheduling Grant Assignment for HSUPA
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Solution Overview
Problem
In HSUPA technology, spectrum utilization, coverage performance, and user peak rate in the uplink direction are lower compared to the downlink direction, and existing methods fail to ensure consistent demodulation performance across multiple input multiple output (MIMO) data streams.
Innovation Solution
Applying MIMO technology to the uplink direction by adjusting transport block sizes of data streams based on grant values and enhanced dedicated transport channel transport format combination indication (E-TFCI) offset values to ensure similar demodulation performance across both streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If MIMO technology is applied to uplink direction, then spectrum utilization and user peak rate are improved, but demodulation performance consistency across data streams cannot be ensured
Solution Approach 1:
The patent changes the parameter of transport block size for different data streams based on channel quality indicators. By adjusting the transport block size parameter according to the channel conditions of each stream, the system maintains demodulation performance consistency while utilizing MIMO technology for improved spectrum utilization.
Solution Approach 2:
The patent implements a feedback mechanism where the Node B determines E-TFCI offset values based on the channel quality of each data stream and feeds back these offset values to the UE. This feedback allows the UE to adjust its transport block sizes appropriately, ensuring consistent demodulation performance across MIMO streams.
2Speed
If MIMO technology is applied to uplink direction, then user peak rate is improved, but coverage performance becomes poorer
Solution Approach 1:
The patent applies local quality by assigning different E-TFCI offset values to different data streams based on their individual channel qualities. This allows each data stream to be optimized locally according to its channel conditions, improving coverage performance for weaker streams while maintaining high peak rates for stronger streams.
3Reliability
If transport block sizes are adjusted based on E-TFCI offset values, then demodulation performance consistency is ensured, but device complexity increases
Solution Approach 1:
The patent introduces E-TFCI offset values as intermediary parameters that simplify the complexity. Instead of directly calculating and adjusting transport block sizes based on complex channel quality measurements, the system uses E-TFCI offset values as intermediaries that encapsulate the channel quality information and guide the transport block size adjustment process.
Data Source
AI summary
The present invention discloses a method and a communication device for assigning a scheduling grant. The method for assigning a scheduling grant includes: receiving a grant value, an E-TFCI offset value, and a data stream identifier corresponding to the E-TFCI offset value, where the E-TFCI offset value is determined by the Node B according to data transmitted by a mobile terminal through two data streams; determining, according to the grant value, a transport block size of the data stream identified by the data stream identifier in a current TTI; and determining a transport block size of the other data stream in the current TTI according to the transport block size and the E-TFCI offset value. in the embodiments of the present invention the MIMO technology may be applied to the HSUPA technology.