Implicit Transmission Mode Signaling via DCI Control Channel
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in signaling multiple transmission modes without increasing the number of DCI formats, which can lead to implementation complexity, testing overhead, and delays due to frequent changes in transmission modes.
Innovation Solution
The method involves using existing control channel characteristics to implicitly indicate transmission modes, allowing a single DCI format to represent multiple modes, thereby increasing flexibility without adding new formats or signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DCI formats are used to indicate different transmission modes, then transmission mode signaling capability is improved, but implementation complexity and testing overhead increase
Solution Approach 1:
The patent applies universality by enabling a single DCI format to serve multiple transmission mode indication functions. The same DCI format structure is used across different transmission modes (TM1-TM10), with the transmission mode determined by RRC-configured mappings between DCI formats and transmission modes rather than having distinct formats for each mode. This reduces implementation complexity while maintaining the ability to signal multiple transmission modes.
2Adaptability or versatility
If new DCI formats are defined for new transmission modes like CoMP and MU-MIMO, then transmission mode flexibility is improved, but signaling overhead and format数量 increase
Solution Approach 1:
The patent enables existing DCI formats to be universally applied to new transmission modes such as CoMP and MU-MIMO through RRC configuration. Instead of creating new DCI formats for each transmission mode, the system configures mappings between existing DCI formats and transmission modes, allowing the same DCI format to indicate different transmission modes based on the configured association. This maintains transmission mode flexibility while avoiding an increase in the number of DCI formats.
3Adaptability or versatility
If higher layer signalling is used to configure transmission modes, then transmission mode configuration capability is improved, but transmission delay increases during frequent changes
Solution Approach 1:
The patent implements dynamics by enabling rapid switching between transmission modes through pre-configured RRC mappings. The RRC layer configures associations between DCI formats and transmission modes in advance, allowing the system to dynamically switch transmission modes by simply changing the DCI format interpretation rather than requiring lengthy reconfiguration signaling. This reduces transmission delay during frequent transmission mode changes while maintaining configuration capability.
Data Source
Figure 1
Figure 2A~2B
AI summary
The present invention relates to a method for operating a communication system, said communication system comprising a primary and at least one secondary station, wherein the primary station selects a transmission mode from a set of at least two transmission modes for communicating with the secondary station,and wherein the secondary station infers the selected transmission mode based on at least one control channel characteristic.