Wireless Sequence Determination Offset Adjustment
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Solution Overview
Problem
Wireless communication systems, especially non-terrestrial networks, face interference issues due to large propagation delays and large cell coverage areas, which cause differences in time domain indexes for downlink and uplink transmissions, leading to serious inter-UE cross-link interference.
Innovation Solution
A method and apparatus for determining sequences in wireless transmission by using offset values relative to synchronization signal blocks, allowing for adjustment of time domain indexes to mitigate interference, with offset values configured or implicitly determined through common timing advance, RRC signaling, MAC control elements, or DCI, enabling synchronization across different sequences and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time domain index is determined based on SSB for sequence generation, then interference randomization is achieved, but large propagation delay causes different time domain indexes for same timeinstance leading to serious inter-UE cross-link interference
Solution Approach 1:
The patent introduces an offset value parameter that is added to the time domain index determined based on SSB. This parameter change allows the time domain index to be adjusted according to the actual transmission timing, compensating for propagation delay effects and ensuring the same time domain index is used for both downlink and uplink at the same time instance, thereby eliminating inter-UE cross-link interference while maintaining interference randomization
Solution Approach 2:
The patent implements a feedback mechanism where the network side device determines an offset value based on the actual transmission timing information and feeds back this offset value to the terminal device. The terminal device then uses this offset value to adjust the time domain index for sequence generation, creating a closed-loop system that adapts to propagation delay variations and eliminates cross-link interference
2Area of stationary object
If large cell coverage area is used to extend wireless communication coverage, then coverage availability is improved, but propagation delay varies causing different time domain indexes and serious inter-UE cross-link interference
Solution Approach 1:
The patent introduces an offset value parameter that is added to the time domain index determined based on SSB. This parameter change allows the time domain index to be adjusted according to the actual transmission timing, compensating for propagation delay effects and ensuring the same time domain index is used for both downlink and uplink at the same time instance, thereby eliminating inter-UE cross-link interference while maintaining interference randomization
Solution Approach 2:
The patent makes the time domain index dynamic by adding an offset value that can vary based on the specific transmission scenario and propagation delay conditions. This dynamic adjustment allows the system to adapt to different cell coverage areas and propagation delay variations, maintaining consistent time domain indexing across large coverage areas while eliminating cross-link interference
Data Source
AI summary
Embodiments of the present application are related to a method and apparatus for sequence determination in wireless transmission. According an embodiment of the present application, an exemplary method includes: receiving configuration information indicating at least one offset value associated with a kind of sequence, wherein each offset value corresponds to a second time domain index offset relative to a first time domain index determined based on synchronization signal block (SSB) associated with the kind of sequence; determining at least one second time domain index associated with the kind of sequence based on the at least one offset value correspondingly; and determining at least one sequence correspondingly based on the at least one second time domain index. Accordingly, embodiments of the present application can allow interference randomization during sequence generation in spite of the unfavorable impact on time domain index.