Base Station RRC Configuration for CBG Transmission and HARQ-ACK Feedback
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Solution Overview
Problem
Current wireless communication systems face limitations in flexibility and efficiency, particularly in managing downlink and uplink transmissions, which affect communication capacity, speed, and overall performance.
Innovation Solution
The implementation of advanced signaling procedures and configurations in base stations and user equipment, including the use of radio resource control (RRC) configuration information for code block group transmissions, HARQ-ACK feedback, and contention window adjustments, to optimize channel access and retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional communication structures are used, then system simplicity is maintained, but communication flexibility and efficiency are limited
Solution Approach 1:
The patent segments the communication structure by introducing separate downlink and uplink channels with distinct transmission directions. The base station transmits downlink signals to UEs while UEs transmit uplink signals to the base station, creating segmented communication paths that enable flexible resource allocation and improved efficiency without requiring complete system redesign
Solution Approach 2:
The patent implements dynamic channel access procedures where the base station can adjust transmission parameters based on real-time conditions. The contention window mechanism and retransmission strategies allow the system to adapt dynamically to varying communication needs, improving flexibility while managing complexity through controlled adaptability
2Productivity
If communication capacity and speed are improved, then transmission efficiency increases, but channel access complexity increases
Solution Approach 1:
The patent incorporates feedback mechanisms where UEs send HARQ-ACK feedback to the base station about downlink signal reception. This feedback loop enables the base station to adjust transmission parameters, manage retransmissions, and optimize channel access, thereby improving communication capacity while controlling complexity through structured feedback protocols
Solution Approach 2:
The patent changes transmission parameters such as modulation schemes, coding rates, and channel allocation based on communication conditions. By dynamically adjusting these parameters, the system optimizes communication capacity and speed while managing complexity through parameterization rather than structural complexity
3Reliability
If retransmission strategies are enhanced, then communication reliability improves, but transmission time increases
Solution Approach 1:
The patent implements preliminary channel access procedures and pre-configured retransmission parameters. The base station prepares transmission parameters in advance and establishes retransmission strategies before actual data transmission, enabling reliable communication while minimizing time delays by having protocols ready rather than reacting to failures
Solution Approach 2:
The patent replaces mechanical retransmission mechanisms with more efficient error correction and acknowledgment systems. By using HARQ-ACK feedback and intelligent retransmission scheduling, the system achieves high reliability while reducing the time overhead associated with traditional retransmission approaches
Data Source
AI summary
A method for a base station which communicates with a user equipment (UE) is described. The method may comprise sending first radio resource control (RRC) configuration information. The first RRC configuration information may indicate code block group (CBG) transmission for a Physical Downlink Shared Channel (PDSCH). The method may also comprise sending second RRC configuration information. The second RRC configuration information may indicate Nmax which is a maximum CBGs per transport block. The method may further comprise, after a channel access procedure, transmitting, to the UE, a PDSCH containing a transport block with N CBG(s). N is an integer. The method may further comprise receiving, from the UE, a HARQ-ACK feedback including Nmax HARQ-ACK information bits for the transport block of the PDSCH. If N is smaller than Nmax, the HARQ-ACK information bit(s) for last Nmax-N CBG(s) may be set to NACK. A contention window for the channel access procedure may be adjusted using the HARQ-ACK feedback, wherein the HARQ-ACK information bit(s) for last Nmax-N CBG(s) may be ignored.