Beamforming Reference Signal Mapping for Accurate Cell Selection
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Solution Overview
Problem
In cooperative communication systems, the selection of candidate cells based on Reference Signal Received Power (RSRP) can lead to reduced gain due to the use of beam-forming, especially in three-dimensional scenarios, as the RSRP for reference signals differs from the received power of data signals, affecting the reception quality at the edge of cells.
Innovation Solution
A communication system where a base station maps separable reference signals onto multiple antennas and a mobile station determines reception quality considering the gain of beam-forming transmission, allowing for optimal candidate cell selection by notifying the base station of the determined reception quality, thereby aligning the RSRP with the data signal reception power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If RSRP of reference signal transmitted from one antenna is used to select candidate cell, then candidate cell selection is simplified, but the selected candidate cell is based on received power different from data signal received power, reducing cooperative communication gain
Solution Approach 1:
The patent changes the parameter used for candidate cell selection from RSRP of reference signal to RSRP of data signal. This parameter change ensures that the selection criterion matches the actual transmission condition, thereby maintaining the cooperative communication gain while still providing a systematic selection method.
Solution Approach 2:
The patent uses the data signal transmission characteristics as a model to determine reference signal transmission parameters. By copying the beamforming approach used for data signals and applying it to reference signals, the system ensures consistent power relationships between reference and data signals, eliminating the power mismatch problem.
2Power
If three-dimensional beam-forming is used in transmission from base station, then transmission gain is increased, but the difference between reference signal RSRP and data signal received power becomes more pronounced, further reducing cooperative communication gain
Solution Approach 1:
The patent changes how reference signal RSRP is calculated in three-dimensional beam-forming scenarios. Instead of using the conventional method that assumes omnidirectional transmission, the patent calculates RSRP considering the actual beamforming gain in both horizontal and vertical directions, making the parameter consistent with data signal reception conditions.
Solution Approach 2:
The patent introduces dynamic adjustment of reference signal transmission parameters based on the beamforming configuration. The reference signal transmission is adapted to match the data signal beamforming pattern, allowing the system to maintain optimal performance in three-dimensional beam-forming while ensuring accurate RSRP measurement for candidate cell selection.
3Reliability
If beam-forming is used for cooperative communication, then spatial diversity gain is achieved, but RSRP measurement does not reflect actual data signal reception quality, adversely affecting candidate cell selection
Solution Approach 1:
The patent changes the RSRP measurement parameter to account for beamforming effects. By calculating RSRP with consideration of beamforming gain, the measurement accurately reflects the actual data signal reception quality, enabling precise candidate cell selection that truly optimizes cooperative communication performance.
Data Source
AI summary
A communication system includes a base station including a plurality of antennas that separate from each other and a mobile station. The base station maps a plurality of reference signals separable from each other onto the antennas to transmit the mapped reference signals. The mobile station determines, using the received reference signals, reception quality in consideration of gain of beam-forming transmission performed by the base station with the antennas, and notifies the base station of the determined reception quality.