SRS Transmission Management in PUCCH Groups
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Solution Overview
Problem
Current multicarrier communication systems face challenges in efficiently managing physical uplink control channel (PUCCH) transmissions, particularly with the increasing number of carriers and uplink traffic, leading to excessive dropping of sounding reference signals (SRS) due to overlapping transmissions with PUCCH and PUSCH signals.
Innovation Solution
The implementation of multiple PUCCH groups and independent SRS transmission procedures within these groups, allowing parallel transmission of SRS with PUCCH and PUSCH signals within the same or different TAGs, reduces SRS dropping by configuring SRS signals independently across PUCCH groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple carriers are configured to handle increasing uplink traffic, then network capacity and throughput are improved, but the probability of transmission overlap between SRS, PUCCH, and PUSCH signals increases, causing excessive SRS dropping
Solution Approach 1:
The patent divides the set of component carriers into multiple PUCCH groups, where each group is independently configured and managed. This segmentation allows SRS transmissions in one PUCCH group to proceed independently even when overlaps occur in other groups, thereby reducing SRS dropping and improving transmission reliability while maintaining high network capacity through multiple carriers
2Measurement precision
If SRS transmission is configured on multiple component carriers, then channel estimation accuracy is improved, but transmission resource conflicts with PUCCH and PUSCH increase, leading to signal dropping
Solution Approach 1:
Component carriers are segmented into multiple PUCCH groups with independent transmission procedures. This allows channel estimation via SRS to be performed on multiple carriers simultaneously within the same or different TAGs, as long as they belong to different PUCCH groups, thereby maintaining measurement precision while reducing transmission conflicts through group-based resource management
Solution Approach 2:
The patent introduces a new dimension of organization by grouping carriers into PUCCH groups and associating them with TAGs (Timing Advance Groups). This multi-dimensional structure (carrier → PUCCH group → TAG) enables independent SRS transmission control across different dimensions, allowing parallel transmissions that would otherwise conflict in a flat carrier structure
3Reliability
If parallel transmission of SRS with PUCCH and PUSCH is enabled, then SRS dropping is reduced, but transmission complexity and resource management difficulty increase
Solution Approach 1:
By segmenting carriers into PUCCH groups with independent procedures, the patent localizes transmission management decisions within each group. This reduces overall system complexity because each PUCCH group can be managed independently, and conflicts in one group do not propagate to others, enabling parallel SRS transmissions while keeping resource management tractable
Data Source
AI summary
A wireless device receives configuration parameters of cells grouped into physical uplink control channel (PUCCH) groups. The cells are in the same timing advance group. A first sounding reference signal (SRS) is transmitted via a first cell of a first PUCCH group in parallel with transmission of a first PUCCH via a second cell of a second PUCCH group. In response to a second PUCCH being transmitted via the first cell in parallel with a configured transmission of a second SRS, the configured transmission of the second SRS via the first cell is dropped.