Signaling Configuration for SRS Multiplexing Capacity
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Solution Overview
Problem
The current multiplexing capacity of Sounding Reference Signals (SRS) in LTE-A systems is insufficient to meet the demands of Full Dimension-MIMO and Massive-MIMO scenarios, particularly in terms of uplink transmission, where the number of UEs that can be multiplexed simultaneously is reduced due to increased SRS resource requirements.
Innovation Solution
A method and apparatus for signaling configuration that involves signaling special subframe configurations to User Equipment (UE) via dedicated signaling messages, allowing for increased time-domain symbols allocation for Uplink Pilot Time Slots (UpPTS) in special subframes, thereby enhancing the multiplexing capacity of SRSs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of time-domain symbols for UpPTS is increased to support Full Dimension-MIMO and Massive-MIMO scenarios, then the multiplexing capacity of SRSs is improved, but the device complexity increases due to the need for dedicated signaling messages and configuration management
Solution Approach 1:
The patent segments the special subframe configuration into two independent parts: a first special subframe configuration (common to all UEs) and a second special subframe configuration (UE-specific). This segmentation allows the system to maintain backward compatibility while enabling enhanced multiplexing capacity for advanced MIMO scenarios through optional configuration of additional time-domain symbols for UpPTS.
Solution Approach 2:
The patent introduces dynamic signaling mechanisms where the base station can flexibly configure the second special subframe configuration based on UE capabilities and system requirements. The signaling messages dynamically adjust the number of time-domain symbols allocated to UpPTS, allowing the system to adapt between conventional and enhanced MIMO modes without fixed hardware constraints.
2Quantity of substance
If the number of time-domain symbols for UpPTS is increased, then more UEs can be simultaneously multiplexed, but the signaling message size and processing overhead increase
Solution Approach 1:
The patent applies local quality by making the enhanced configuration (second special subframe configuration) optional and UE-specific rather than mandatory for all UEs. This allows the system to allocate additional time-domain symbols only for UEs requiring advanced MIMO functionality, while other UEs continue using the conventional configuration, thereby reducing overall signaling overhead.
Solution Approach 2:
The patent implements partial action by providing a base configuration (first special subframe configuration) that is sufficient for conventional LTE operations, and an optional enhanced configuration (second special subframe configuration) that can be activated only when needed. This partial implementation approach avoids the excessive signaling overhead that would result from universally enforcing enhanced configurations for all UEs.
Data Source
AI summary
The present disclosure provides a method for signaling configuration. The method includes: signaling, by a base station, a first special subframe configuration and a second special subframe configuration to a User Equipment (UE) via a first signaling message and a second signaling message. The first special subframe configuration is determined by the base station and the UE based on the first signaling message, and the second special subframe configuration is determined by the base station and the UE based on the first signaling message and the second signaling message or based on the second signaling message. With the above method, the problem associated with low multiplexing capacity of Sounding Reference Signals (SRSs) can be solved and the multiplexing capacity of SRSs can be improved.