Pilot Group Configuration for Grant-Free Transmission
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Solution Overview
Problem
In wireless networks, pilot collisions during grant-free transmission lead to reduced successful decoding rates of user data, as the network device cannot distinguish between users using the same pilot, resulting in interference and incorrect decoding.
Innovation Solution
The network device obtains pilot groups for user equipment (UEs), determines channel estimation information, and decodes data in unit time by using a pilot group configuration mechanism, where UEs select specific pilot groups based on preconfigured algorithms or tables, reducing pilot collisions and enabling accurate decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If grant-free transmission is used to reduce signaling overhead and access delay, then productivity is improved, but reliability deteriorates due to pilot collision causing interference and decoding failures
Solution Approach 1:
The patent divides the single pilot selection into multiple pilot groups (first pilot group and second pilot group). UEs are segmented into different groups that select pilots from different pools, which reduces the probability of pilot collision while maintaining grant-free transmission benefits
Solution Approach 2:
The patent introduces a new dimension of pilot group selection in addition to the traditional single pilot selection. By adding the pilot group dimension, the system expands the pilot selection space from individual pilots to pilot groups, thereby reducing collision probability while maintaining transmission efficiency
2Loss of time
If UEs independently select pilots without scheduling to eliminate access delay, then time is improved, but measurement precision deteriorates due to inability to detect users under pilot collision
Solution Approach 1:
The patent segments the pilot selection process into multiple independent pilot groups. By dividing the pilot pool into separate groups and assigning UEs to different groups, the system maintains independent selection capability while improving user detection accuracy through reduced collision probability
Solution Approach 2:
The patent changes the pilot selection parameter from selecting a single pilot to selecting a pilot group containing multiple pilots. This parameter change increases the diversity of selected pilots and reduces collision probability, thereby improving user detection accuracy while maintaining low access delay
Data Source
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AI summary
Embodiments of the present invention provide a data processing method, a device, and a system. The method includes: determining a pilot group, where the pilot group includes at least two elements; generating a plurality of data frames including a first data frame and a second data frame, where each data frame carries information used to indicate the pilot group determined by user equipment UE; and sending a plurality of resource blocks to a network device, where a first resource block carries the first pilot and the first data frame, and a second resource block carries the second pilot and the second data frame. In this patent application, after determining the information of the pilot group, the user equipment sends, to the network device by using the resource blocks, the information indicating the pilot group, so that the network device obtains pilot groups of at least some UEs, further obtains pilots transmitted by all UEs in unit time, and further decodes data transmitted by the UEs in the unit time, thereby effectively resolving a technical problem that decoding cannot be performed due to pilot collision.