Uplink Reference Signal Interference Randomization via UE-Specific Time Shift
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Solution Overview
Problem
Current wireless communication networks face challenges in reducing interference between reference signals from user equipment, particularly in CoMP scenarios where base sequence indices are not aligned in time, limiting network flexibility and orthogonal signal pairing opportunities.
Innovation Solution
Introducing a UE-specific time shift value for CSH and SGH sequence generators, allowing for proper time alignment of pseudo-random sequences, which can be signaled via RRC, to derive a processed reference signal that reduces interference between reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If base sequence indices are not aligned in time for interference randomization, then network flexibility is improved, but orthogonality between reference signals deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-aligning the base sequence indices in time before generating the reference signals. The network node determines time shift values and communicates them to user equipment in advance, ensuring that when the reference signals are transmitted, their base sequence indices are properly aligned. This preliminary time alignment resolves the contradiction by maintaining orthogonality (reliability) while still allowing flexible time shift adjustments (adaptability) on a per-user basis.
2Reliability
If base sequence indices are aligned in time for interference randomization, then orthogonality between reference signals is improved, but network flexibility deteriorates
Solution Approach 1:
The patent applies dynamics by making the time shift values adjustable and user-specific rather than fixed for all users. The network node can dynamically determine different time shift values for different user equipment based on their specific interference conditions and requirements. This dynamic approach maintains orthogonality through proper alignment while preserving network flexibility by allowing adaptive adjustment of time shifts on a per-user basis, resolving the contradiction between reliability and adaptability.
3Reliability
If UE-specific time shift values are introduced for CSH and SGH sequence generators, then interference randomization is improved, but device complexity increases
Solution Approach 1:
The patent applies the intermediary principle by introducing a network node as a mediator that determines and manages the time shift values. Instead of requiring complex autonomous calculations at the user equipment, the network node acts as an intermediary that pre-determines appropriate time shift values and communicates them to user equipment. This simplifies the device complexity at user equipment while maintaining effective interference randomization through properly coordinated time shifts managed by the network.
Data Source
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AI summary
Interference between reference signals.from user equipments in a wireless network, the method may be reduced by using a received lime shift value from a node in the wireless network. An interference randomization technique may be applied to a reference signal and a sequence may be generated based on the reference signal to which the interference randomization technique has been applied. A processed reference signal may be derived by applying a time shift based on the time shift value to the sequence. The processed reference signal may be transmitted to the node. Related systems, methods, nodes and wireless devices are also described.