LTE Measurement Subframe Pattern Coordination for Interference Reduction
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Solution Overview
Problem
In LTE-based radio communication systems, efficiently measuring reference signal received power (RSRP) and reference signal received quality (RSRQ) of serving and neighboring cells is challenging, especially in environments with coexisting base stations from different networks and with enhanced inter-cell interference coordination (eICIC) in LTE-Advanced systems, due to interference and differing subframe configurations.
Innovation Solution
A method is provided where a user equipment (UE) configures subframes for measurement differently for serving and neighboring cells by transmitting specific pattern information, indicating which subframes are used for measurement as '1', allowing the UE to measure RSRP and RSRQ using cell-specific reference signals, and coordinating subframe configurations through X2 interface signaling and RRC messages to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If subframes for measurement are configured differently for serving and neighboring cells to reduce interference, then measurement accuracy is improved, but system complexity increases due to multiple pattern configurations
Solution Approach 1:
The measurement subframes are segmented into different patterns for serving cells and neighboring cells. The serving cell uses one measurement subframe pattern while neighboring cells use a different pattern, allowing interference-free measurement of neighboring cells during serving cell transmission subframes.
Solution Approach 2:
The measurement subframe patterns are made dynamic and configurable through RRC signaling. The network can flexibly adjust the measurement subframe configurations based on traffic conditions and interference scenarios, optimizing measurement accuracy without fixed rigid structures.
2Object-affected harmful factors
If measurement subframes are coordinated between serving and neighboring cells through pattern information, then interference is reduced, but signaling overhead increases
Solution Approach 1:
The measurement subframe pattern information serves multiple functions: it coordinates interference management between cells, provides measurement timing guidance to UEs, and enables efficient resource utilization. This multi-functionality reduces the need for separate signaling mechanisms.
Solution Approach 2:
The measurement subframe patterns are configured using RRC parameters that can be adjusted based on network conditions. By changing these parameters dynamically, the system optimizes interference coordination while managing signaling overhead through efficient parameter encoding and transmission.
3Measurement precision
If pattern information is transmitted via RRC messages and X2 interface signaling to coordinate measurement subframes, then cell selection accuracy is improved, but message transmission complexity increases
Solution Approach 1:
The measurement subframe pattern information is merged into existing RRC message structures and X2 interface signaling protocols. By integrating the pattern information into already-established messaging frameworks, the system avoids creating separate complex signaling mechanisms while achieving coordinated measurement.
4Productivity
If different subframe configurations are used for serving and neighboring cells to enable accurate RSRP and RSRQ measurement, then network performance is improved, but implementation complexity increases
Solution Approach 1:
The measurement subframe patterns are pre-configured and communicated to UEs before actual measurements begin. This preliminary configuration allows UEs to prepare measurement routines in advance, reducing real-time processing complexity while maintaining accurate measurements for cell selection and reselection.
Data Source
AI summary
A method and base station for transmitting information for cell measurements, and a method and user equipment for performing cell measurements are discussed. The method according to one embodiment includes transmitting, by the base station, signals according to an almost blank subframe pattern; and transmitting, by the base station, information indicating a first time domain measurement resource restriction pattern and a second time domain measurement resource restriction pattern. The almost blank subframe pattern indicates which subframes the base station is configuring. The first time domain measurement resource restriction pattern indicates which subframe is one or more first subframes configured for reference signal received power (RSRP) or reference signal received quality (RSRQ) measurements, and the second time domain measurement resource restriction pattern indicates which subframe is one or more second subframes configured for RSRP or RSRQ measurements.