Uplink Reference Signal Bundling for Phase Continuity
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Solution Overview
Problem
In wireless communications, particularly in 5G systems, maintaining phase continuity across multiple instances of uplink reference signals is challenging due to the sharing of resources between access link and sidelink communications, which disrupts the joint processing of reference signals, affecting reliability and efficiency.
Innovation Solution
User equipment (UE) determines whether to drop or transmit sidelink communications based on the time or frequency division multiplexing relationship with uplink reference signals, using a time threshold value or power allocation to maintain phase continuity, and prioritizes communications to ensure reliable uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink communications are transmitted simultaneously with uplink reference signals, then resource utilization is improved, but phase continuity of reference signals is disrupted
Solution Approach 1:
The patent segments the transmission resources by introducing a time threshold that divides reference signal instances into bundling groups. Sidelink communications are allowed in gaps between groups rather than disrupting the entire transmission, enabling both reference signal bundling and sidelink communication to coexist with reduced interference.
Solution Approach 2:
The patent implements dynamic resource allocation where the UE adaptively determines whether to transmit sidelink communications based on real-time conditions including the time threshold, bundling configuration, and communication priorities. This dynamic approach allows flexible adjustment between maintaining phase continuity and enabling sidelink transmissions.
2Measurement precision
If multiple instances of uplink reference signals are bundled for joint processing, then channel estimation accuracy is improved, but transmission scheduling complexity increases
Solution Approach 1:
The patent changes the time parameter by introducing a time threshold that defines the maximum interval between reference signal instances for bundling. This parameter-based approach simplifies the scheduling complexity by providing a clear criterion for determining which instances can be bundled, while still achieving improved channel estimation accuracy through joint processing of bundled instances.
3Reliability
If sidelink communications are dropped to maintain phase continuity, then reference signal reliability is improved, but sidelink communication efficiency decreases
Solution Approach 1:
The patent applies partial action by allowing sidelink communications to proceed in cases where the time interval exceeds the threshold, rather than always dropping them. This partial approach maintains reference signal reliability for bundled instances while preserving sidelink communication efficiency when conditions permit, avoiding unnecessary drops.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described in which a user equipment (UE) may perform uplink reference signal bundling for access link communications and transmit sidelink communications using time or frequency division multiplexed resources. The UE may determine to drop or to transmit a sidelink communication based on a relationship with multiple instances of an uplink reference signal that are to maintain phase continuity. The UE may drop a sidelink communication when a time duration between two instances of the uplink reference signal is less than or equal to a time threshold value, and may transmit the sidelink communication when the time duration exceeds the time threshold value. In frequency division multiplexed cases, the UE may set a transmission power for each instance of the uplink reference signal, and the sidelink communication may use a remaining amount of power.