MIMO-Related Order for CQI Mode Selection
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Solution Overview
Problem
Current wireless communication systems lack an effective method for a MIMO-capable wireless terminal to switch into MIMO mode when conditions favor MIMO transmission, due to the lack of antenna-related information in normal CQI reports, leading to inefficient resource allocation and increased overhead.
Innovation Solution
A method is introduced where a MIMO-related order is generated and included in control signaling on the high-speed downlink shared channel to request MIMO channel quality indications from wireless terminals, even when they are not operating in MIMO mode, allowing for the modification of CQI communications to facilitate MIMO mode switching based on the terminal's capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If normal CQI reports are used without antenna-related information, then the CQI communication overhead is reduced, but the ability to switch to MIMO mode is lost
Solution Approach 1:
The patent implements dynamic CQI reporting by introducing a CQI report type indicator that allows the wireless terminal to switch between normal CQI reporting (without antenna information) and MIMO CQI reporting (with antenna information) based on current channel conditions and MIMO capability status. This dynamic switching mechanism resolves the contradiction by adapting the reporting format to current operational needs rather than using a fixed format.
Solution Approach 2:
The patent changes the parameter structure of CQI reports by introducing a report type indicator parameter and optionally an antenna information parameter. When the indicator signals MIMO capability, additional antenna-related parameters are included in the report. This parameter flexibility allows the system to obtain necessary antenna information for MIMO switching while maintaining normal operation with reduced overhead when MIMO is not active.
2Measurement precision
If MIMO CQI reports are continuously requested, then accurate MIMO mode switching decisions can be made, but the control signaling overhead increases
Solution Approach 1:
The patent applies partial action by requesting MIMO CQI reports only when necessary for MIMO mode switching decisions, rather than continuously. The base station evaluates current channel conditions and terminal state to determine when antenna-related CQI information is needed, sending CQI request indicators selectively. This approach obtains sufficient measurement precision for switching decisions while minimizing the quantity of control signaling overhead.
3Adaptability or versatility
If the base station requests MIMO CQI reports from non-MIMO operating terminals, then MIMO mode switching becomes possible, but the complexity of CQI communication management increases
Solution Approach 1:
The patent segments the CQI reporting mechanism into distinct types (normal CQI and MIMO CQI) with a clear indicator distinguishing them. This segmentation simplifies management by providing explicit type identification rather than requiring complex interpretation of mixed-format reports. The base station and terminal can efficiently manage CQI communications by processing reports according to their indicated type, reducing overall system complexity despite the enhanced adaptability.
Data Source
AI summary
A network node (28) communicates over a radio interface (32) with a wireless terminal (30). Both the network node (28) and the wireless terminal (30) have multiple-input multiple-output (MIMO) capabilities. A MIMO-related order (90) is generated for inclusion in control signaling on a high speed downlink shared channel from the network node (28) to the wireless terminal (30). The MIMO-related order (90) is configured to modify channel quality indication (CQI) communications between the wireless terminal (30) and the base station (28) in view of MIMO capabilities of the wireless terminal (30). The method further comprises providing a channel quality indication (CQI) report (92) the wireless terminal (30) to the base station (28) in accordance with the order.