MIMO Offset Value Generation for Uplink Adaptation
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Solution Overview
Problem
In wireless communication systems, especially during soft/softer handover situations, existing technologies face challenges in accurately adapting MIMO uplink communications to varying channel conditions between wireless terminals and different antenna arrays, leading to suboptimal data rates and reliability.
Innovation Solution
The method involves generating an offset value based on information from multiple antenna arrays to adjust the transport block sizes of MIMO data streams, ensuring better adaptation to channel conditions by transmitting this offset value to the wireless terminal, thereby improving MIMO uplink performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transport block sizes of MIMO data streams are not adapted to varying channel conditions between wireless terminal and different antenna arrays, then device complexity is reduced, but data rate and reliability deteriorate
Solution Approach 1:
The patent changes the parameter of transport block size based on channel conditions. The network node determines different transport block sizes for different antenna arrays by adjusting the TBS index in the uplink grant, allowing adaptation to varying channel quality without complex reconfiguration of the entire MIMO system.
Solution Approach 2:
The patent implements dynamic adaptation of transport block sizes for different MIMO data streams based on real-time channel conditions. The network node can dynamically adjust the TBS for each antenna array independently, enabling flexible response to changing channel characteristics during operation.
2Adaptability or versatility
If offset values are generated and transmitted to wireless terminal for each transmission time interval, then adaptability to channel conditions improves, but signaling overhead increases
Solution Approach 1:
The patent performs preliminary determination of transport block size differences before actual data transmission. The network node calculates the offset value based on predicted or previously measured channel conditions and includes it in the uplink grant before the wireless terminal transmits the MIMO data streams, avoiding the need for continuous feedback signaling.
Solution Approach 2:
The patent uses the uplink grant as an intermediary carrier to convey the offset value information from the network node to the wireless terminal. Instead of dedicated signaling channels, the offset information is embedded in the existing grant structure, reducing additional signaling overhead.
Data Source
AI summary
A method of communicating with a wireless terminal may include providing first information responsive to receiving first and second multiple-input-multiple-output (MIMO) data streams from the wireless terminal through a first antenna array of a first sector during a first transmission time interval. Second information may be provided responsive to receiving the first and second MIMO data streams from the wireless terminal through a second antenna array of a second sector during the first transmission time interval with the first and second sectors being different and the first and second antenna arrays being different. An offset value may be generated responsive to the first information and/or the second information, with the offset value defining a difference between the first and second MIMO data streams for a second transmission time interval, and the offset value may be transmitted to the wireless terminal.