Transport Block Control Multiplexing for Faster LTE PDU Processing
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Solution Overview
Problem
In LTE systems, the processing time for transmitter and receiver is limited, and the real-time processing requirements for RLC and MAC PDUs lead to delays in data transmission, particularly due to the inability to perform pre-processing before grant reception, which affects the efficiency of data transmission.
Innovation Solution
The solution involves optimizing the processing by allowing pre-processing of RLC and MAC headers and control elements before grant reception, enabling early start of encoding and reducing the delay in submitting MAC PDUs to the physical layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate PDCCH resources are allocated for each serving cell, then control information reliability is improved, but downlink control channel resource consumption increases linearly with the number of serving cells
Solution Approach 1:
The patent combines control information from multiple serving cells into a single PDCCH resource. The network device multiplexes downlink control information for multiple serving cells onto one PDCCH, allowing multiple cells to share control channel resources rather than each cell requiring separate dedicated resources. This merging approach reduces overall control channel resource consumption while maintaining the ability to convey control information for multiple cells simultaneously.
Solution Approach 2:
The patent enables a single PDCCH resource to serve multiple functions by carrying control information for multiple serving cells. The PDCCH is designed to be universal in its capability,能够 convey control information not just for one cell but for multiple cells concurrently. This multi-functionality allows the same control channel infrastructure to support an expanding number of serving cells without proportional increases in resource consumption.
2Quantity of substance
If control information for multiple serving cells is multiplexed into one PDCCH, then downlink control channel resource consumption is reduced, but control information transmission complexity increases
Solution Approach 1:
The patent segments control information by introducing a cell indicator field that divides and identifies control information belonging to different serving cells within a single PDCCH. This segmentation allows the receiver to distinguish and process control information for each cell separately, even though they are transmitted together. The cell indicator acts as a delimiter or tag that organizes the multiplexed control information into manageable segments corresponding to individual cells.
Solution Approach 2:
The patent introduces a cell indicator as an intermediary element that facilitates the multiplexing process. This indicator serves as a mediator between the control information of different cells and the single PDCCH resource, enabling the receiver to correctly associate control information with the appropriate serving cell. The cell indicator mediates the relationship between multiple cells and the shared control channel, resolving the complexity of managing multiplexed control information.
3Reliability
If PDCCH resource allocation is increased to support more serving cells, then control information coverage is improved, but uplink control feedback resource consumption increases
Solution Approach 1:
The patent merges control information from multiple serving cells into a single PDCCH transmission. By consolidating control information for multiple cells into one PDCCH resource, the system improves control information coverage and reliability without requiring proportional increases in uplink feedback resources. The UE can send consolidated feedback for multiple cells simultaneously, reducing the overall uplink control feedback resource consumption compared to separate feedback channels for each cell.
Data Source
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AI summary
The present disclosure relates to systems and methods for transmitting data over a wireless channel from a data transmitting node to a data receiving node in a communication system. In particular, the data transmitting node comprises second-layer processing circuitry for receiving, from a third layer, at least one second-layer service data unit, SDU, to be mapped onto a resource allocated for data transmission, and for generating a second-layer protocol data unit, PDU, including said at least one second-layer SDU and at least one second-layer control element, the at least one second-layer control element placed after any of the at least one second-layer SDU, and first-layer processing circuitry for receiving the second-layer PDU generated by the second-layer processing circuitry and mapping the second-layer PDU onto the resource allocated for data transmission. The data receiving node comprises first-layer processing circuitry for de-mapping at least one second-layer protocol data unit, PDU, from a resource allocated for data reception, and a second layer processing circuitry for receiving and parsing the second-layer PDU de-mapped by the first-layer processing circuitry, the second-layer PDU including at least one second-layer service data unit, SDU, and at least one second-layer control element, the at least one second-layer control element following any of the at least one second-layer SDU.