MIMO Information Encoding in LTE-A Downlink Control Signaling
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Solution Overview
Problem
Current LTE-A systems lack a method for a base station to transmit essential MIMO-related information to user equipment (UE) for data demodulation, leading to incomplete data demodulation capabilities in UEs.
Innovation Solution
A method is introduced where the base station encodes and transmits MIMO-related information, such as Rank, DM-RS port, and scrambling identity, within the downlink control signaling using modified DCI formats (e.g., DCI format 2C) with added MIMO information fields, allowing UEs to decode and obtain necessary information for data demodulation with reduced signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station transmits MIMO related information using existing downlink control signaling formats, then the UE can perform data demodulation, but the signaling overhead increases
Solution Approach 1:
The patent combines MIMO related information (Rank, DM-RS port, SCID) with existing downlink control signaling formats (DCI format 1A, 2A, 2B, etc.) by reusing or slightly modifying these formats. This merging approach allows the base station to transmit necessary MIMO information to the UE without introducing completely new signaling structures, thereby reducing overall signaling overhead while ensuring the UE can perform accurate data demodulation.
Solution Approach 2:
The patent makes existing downlink control signaling formats multi-functional by enabling them to carry both traditional control information and MIMO related information. For example, DCI format 1A is enhanced to include Rank indication, DM-RS port indication, and SCID fields, allowing a single signaling format to serve multiple purposes: resource allocation, power control, and MIMO configuration, thus reducing the need for separate dedicated signaling messages.
2Reliability
If the base station uses modified DCI formats with added MIMO information fields, then the UE can obtain necessary information for data demodulation, but the device complexity increases
Solution Approach 1:
The patent applies local quality by making targeted, localized modifications to specific fields within DCI formats rather than redesigning the entire structure. For instance, it adds specific fields (Rank, DM-RS port, SCID) to relevant DCI formats while keeping other fields unchanged. This localized approach minimizes the impact on overall device complexity while ensuring the necessary MIMO information is conveyed accurately for reliable data demodulation.
Solution Approach 2:
The patent introduces dynamic fields within DCI formats that can be selectively activated or deactivated based on the transmission mode and MIMO configuration. For example, the Rank field is dynamically adjusted based on the number of layers being transmitted, and the SCID field is only included when scrambling identity needs to be indicated. This dynamic approach allows the DCI format to adapt to different scenarios, reducing average device complexity while maintaining data demodulation accuracy when needed.
Data Source
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AI summary
The present invention provides a method for transmitting MIMO related information. The method includes: encoding MIMO related information of a user equipment (UE) by a base station, and transmitting downlink control signaling including a result of the encoding; receiving by the UE the downlink control signaling transmitted by the base station, obtaining the result of the encoding, and obtaining the MIMO related information of the UE by decoding the result of the encoding. By adopting the method, the base station is enabled to transmit MIMO related information required by the UE to the UE with small signaling overhead.