DCI Format 0B Transport Block Enablement
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE, face challenges in efficiently indicating and managing enabled transport blocks for uplink transmission, leading to suboptimal modulation schemes and increased control signaling overhead.
Innovation Solution
The introduction of a new downlink control information (DCI) format, specifically DCI format 0B, which includes a 2-bit TB_enable information element to indicate the enablement or disablement of transport blocks, allowing for more precise control over uplink multiple-input multiple-output (MIMO) transmission modes and reducing signaling overhead by using MCS and RV fields to determine transport block status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional DCI formats are used to indicate transport blocks, then control signaling is transmitted, but control signaling overhead increases and indication precision decreases
Solution Approach 1:
The patent introduces a new DCI format (0B) with modified parameters including a 2-bit TB_enable field that efficiently indicates the enablement status of up to four transport blocks. This parameter change allows precise indication of TB status without requiring separate signaling for each TB, thereby reducing control signaling overhead while improving indication precision
Solution Approach 2:
The TB_enable field in DCI format 0B serves multiple functions: it indicates which transport blocks are enabled, determines the number of enabled TBs (1-4), and controls uplink MIMO transmission modes. This multi-functionality eliminates the need for separate signaling mechanisms for each function, reducing overall control signaling overhead while maintaining high indication precision
2Reliability
If separate signaling is used for each transport block, then transport block status is clearly indicated, but control signaling overhead increases
Solution Approach 1:
The patent merges the status indication of multiple transport blocks into a single 2-bit TB_enable field in DCI format 0B. This field encodes the enablement status of up to four transport blocks using compact binary representation, ensuring reliable status indication while minimizing control signaling overhead by combining multiple indications into one field
3Productivity
If uplink MIMO transmission is enabled, then data transmission capacity increases, but modulation scheme selection becomes more complex
Solution Approach 1:
The patent modifies DCI format 0B to include explicit parameters that define modulation schemes and transport block configurations for uplink MIMO. By changing the DCI structure to include TB_enable fields and associated modulation parameters, the system enables complex MIMO transmissions with clear, standardized parameter definitions, making modulation scheme selection more manageable despite increased transmission capacity
Solution Approach 2:
The patent enables dynamic selection of modulation schemes and transport block configurations through the TB_enable field in DCI format 0B. The system can dynamically adjust the number of enabled transport blocks (1-4) and their corresponding modulation schemes based on channel conditions and traffic requirements, providing flexibility in managing uplink MIMO complexity while maximizing data transmission capacity
Data Source
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AI summary
A base station is provided. The base station includes transmit path circuitry that generates an uplink grant using an uplink multiple-input multiple-output (MIMO) downlink control information (DCI) format. The uplink MIMO DCI format includes a modulation and coding scheme (MSC) field having an MCS value for each of two transport blocks. The transmit path circuitry transmits the uplink grant to a subscriber station. For a given transport block, a combination of the MCS value corresponding to the transport block and a number positive integer of physical resource blocks allocated to the subscriber station (N_PRB) indicates whether the transport block is disabled.