Discovery Signal RSSI Definition for Wireless Cell Detection
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Solution Overview
Problem
In wireless communication systems, especially in dense small cell scenarios, existing methods for cell discovery are inefficient, leading to challenges in detecting multiple cells quickly and performing measurements within a short time frame, which is crucial for fast transition between on/off states of small cells to reduce interference and enhance user packet throughput.
Innovation Solution
A method and apparatus for defining a received signal strength indicator (RSSI) for discovery signals, allowing user equipment (UE) to perform measurements only during discovery signal occasions, utilizing advanced discovery signals such as PSS/SSS, CSI-RS, and PRS, and configuring measurement timing to support efficient cell detection and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurements are performed continuously, then measurement coverage is complete, but time consumption increases and productivity decreases
Solution Approach 1:
The patent applies preliminary action by having the UE perform measurements only during discovery signal occasions that are configured in advance by the network. The UE receives configuration information indicating specific time windows when discovery signals are transmitted, and performs measurements only during these pre-specified occasions, eliminating the need for continuous measurement while ensuring adequate measurement coverage.
2Reliability
If small cells are always on, then service availability is high, but interference increases and productivity decreases
Solution Approach 1:
The patent applies periodic action by enabling small cells to transmit discovery signals periodically rather than continuously. The small cells can be turned off during non-discovery periods to reduce interference, while the UE performs measurements only during the periodic discovery signal transmission occasions configured by the network, maintaining service availability when needed.
3Speed
If discovery signals are transmitted frequently, then cell discovery speed increases, but energy consumption increases
Solution Approach 1:
The patent applies parameter changes by allowing flexible configuration of discovery signal transmission parameters including periodicity, time windows, and resource allocation. The network can adjust these parameters to optimize the balance between cell discovery speed and energy consumption, enabling faster discovery when needed while reducing transmission frequency to save energy during normal operation.
Data Source
AI summary
A method and apparatus for performing measurements in a wireless communication system is provided. The method includes receiving an indication on measurements based on a discovery signal from a network, and performing measurements only in discovery signal occasions. In another aspect, a user equipment (UE) includes a memory, a transceiver, and a processor coupled to the memory and the transceiver, and configured to control the transceiver to receive an indication on measurements based on the discovery signal from the network, and perform measurements only in discovery signal occasions.