SRS Cell ID Configuration and Resource Reservation
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Solution Overview
Problem
Traditional SRS transmission in wireless communications is limited by the need for all UEs in a cell to share a common cell ID, restricting available SRS resources and allowing only limited SRS sequences, which can lead to inadequate network performance.
Innovation Solution
Configuring one or more cell IDs for SRS and reserving specific transmission resources within a subframe or its second slot for SRS transmission, allowing for the use of virtual cell IDs and flexible resource allocation, including periodic or aperiodic configurations, to enhance SRS capacity and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all UEs in a cell share a common cell ID, then the system maintains simplicity in cell identification, but the available SRS resources are limited to sequences generated based on the common cell ID
Solution Approach 1:
The patent segments the cell ID resource by introducing virtual cell IDs specifically for SRS transmission, separating the common cell ID used for general identification from the virtual cell IDs used for SRS sequence generation. This allows multiple UEs to have dedicated virtual cell IDs while the base station maintains a single common cell ID, thereby increasing SRS resource availability without complicating overall cell identification management
Solution Approach 2:
The patent introduces virtual cell IDs as an intermediary between the common cell ID and SRS sequence generation. These virtual cell IDs act as a mediator that enables multiple UEs to generate distinct SRS sequences while the base station continues to use the common cell ID for general cell identification, thus resolving the contradiction between simplicity and resource availability
2Ease of operation
If SRS transmission is restricted to the last symbol of a normal subframe, then the transmission timing is simplified, but the SRS capacity and coverage are limited
Solution Approach 1:
The patent extends SRS transmission from a single time position (last symbol of normal subframe) to multiple dimensions including different symbol positions within subframes, different slots, and both periodic and aperiodic transmission opportunities. This multi-dimensional time resource allocation dramatically increases SRS capacity and coverage while maintaining manageable timing through structured configuration parameters
3Quantity of substance
If reserved transmission resources are allocated for SRS, then SRS capacity increases, but the resource allocation complexity increases with bitmap configuration
Solution Approach 1:
The patent uses bitmap parameters to flexibly configure reserved transmission resources, where different bitmap lengths (7-bit for slot-level, 14-bit for subframe-level) allow the system to adapt resource allocation granularity to specific deployment scenarios. This parameter-based configuration enables scalable resource allocation that increases SRS capacity while keeping the configuration mechanism systematic and manageable
Data Source
AI summary
Methods and apparatuses for SRS enhancement are disclosed. In one embodiment, a method comprises configuring one or more cell IDs for SRS; and sending the configured cell ID(s) for SRS using higher layer signaling. In some embodiment, the method further comprises determining reserved transmission resources only for SRS transmission; and transmitting resource configuration parameters for the reserved transmission resources.