Wireless Signal Control for Flexible Multi-Cell Scheduling
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in transmitting and receiving control and data signals, particularly in multi-cell scheduling scenarios, leading to increased DCI overhead and reduced flexibility in scheduling multiple cells.
Innovation Solution
A method and apparatus for transmitting and receiving signals in a wireless communication system that utilizes a modified DCI format to efficiently schedule physical downlink shared channels (PUSCHs) across multiple cells, employing a common DMRS sequence initialization field and shared information for DMRS sequences to reduce DCI payload size and enhance flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate DMRS sequence initialization fields are used for each cell in multi-cell scheduling, then each cell can have independent DMRS sequences, but DCI overhead increases
Solution Approach 1:
The patent combines multiple separate DMRS sequence initialization fields into a single shared field for multi-cell scheduling. The DCI format includes one common initialization field that generates DMRS sequences for multiple cells simultaneously, eliminating the need for separate fields per cell while maintaining sequence distinguishability through cell-specific parameters.
Solution Approach 2:
The single DMRS sequence initialization field serves multiple cells universally, enabling one field to perform the function that previously required multiple separate fields. This multi-functional approach reduces DCI overhead while still providing adequate DMRS sequences for each scheduled cell through shared resource allocation.
2Adaptability or versatility
If traditional DCI formats are used for multi-cell scheduling, then each cell can be scheduled independently, but scheduling flexibility is reduced
Solution Approach 1:
The patent introduces dynamic cell grouping mechanisms where cells can be flexibly grouped and ungrouped based on scheduling requirements. The DCI format supports dynamic activation of cell groups, allowing the system to adapt to varying multi-cell scheduling scenarios without being constrained by fixed, complex format structures.
Solution Approach 2:
The patent segments the multi-cell scheduling problem into manageable cell groups that can be independently controlled. By dividing multiple cells into configurable groups, the system achieves scheduling flexibility for different cell combinations while maintaining simpler DCI formats compared to handling all cells individually.
3Loss of information
If multiple DCI messages are transmitted for scheduling multiple cells, then each cell receives dedicated control information, but control signal overhead increases
Solution Approach 1:
The patent merges multiple separate DCI messages into a single unified DCI format that schedules multiple cells simultaneously. This combined DCI includes shared resources such as DMRS sequence initialization fields, PDSCH resource allocations, and other control parameters that can be commonly applied across multiple cells, significantly reducing the total control signal overhead.
Solution Approach 2:
The unified DCI format performs multiple scheduling functions in a single message, enabling it to control multiple cells with one transmission. This multi-functional DCI structure eliminates the need for separate DCI messages for each cell while ensuring that each cell receives the necessary control information through shared and cell-specific parameter fields.
Data Source
AI summary
A method and apparatus for monitoring a signal in a wireless communication system, disclosed in the present specification, comprise receiving DCI for scheduling PDSCHs or PUSCHs on different cells. In detail, the DCI includes one or more DCI fields for the PDSCHs or PUSCHs on the different cells.