Beam Reordering for Fast Small Cell Handover
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Solution Overview
Problem
In wireless communication systems employing beamforming techniques, the initial access time between User Equipment (UE) and eNBs is prolonged due to the need to scan and determine the best transmission and reception beams, especially in environments where macro-cells and small cells overlap, leading to increased control burden and interference.
Innovation Solution
A method and apparatus that facilitate channel access by allowing UE connected to a macro-cell eNB to access a small cell eNB, involving RSSI measurement reporting, RRC Connection Reconfiguration, and beam reordering to expedite the initial access process, reducing the number of beams to be scanned and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If beamforming technique is employed for high rate data transmission, then data transmission rate is improved, but initial access time between UE and eNB is prolonged due to need to scan and determine best transmission and reception beams
Solution Approach 1:
The patent applies preliminary action by having the UE report RSSI measurement results to the source eNB before handover, and by having the source eNB determine and provide beam information to the target eNB in advance. This allows the target eNB to pre-configure the appropriate reception beam, eliminating the need for beam scanning during initial access and thus reducing access time while maintaining high data transmission rates.
2Adaptability or versatility
If number of transmission beams and reception beams is increased for beamforming, then beamforming capability is improved, but burden of control to measure and determine best beam is increased
Solution Approach 1:
The patent uses the source eNB as an intermediary that collects RSSI measurement results from the UE, determines the appropriate beam information, and provides this information to the target eNB. This intermediary role simplifies the control burden by centralizing the beam determination process at the source eNB, which has access to the measurement data, rather than requiring the target eNB to perform complex beam scanning and measurement procedures.
3Area of stationary object
If UE performs initial access to every eNB in overlapping macro-cell and small cell environment, then network coverage is improved, but initial access time increases and interference is caused
Solution Approach 1:
The patent applies preliminary action by having the UE measure and report RSSI values for multiple eNBs (including small cells) in advance to the source eNB. The source eNB then determines the most suitable target eNB for handover based on these pre-collected measurements. This allows the network to prepare the target eNB with the correct beam information before handover, enabling fast access to small cells without requiring time-consuming beam scanning, thus reducing initial access time while maintaining extended network coverage.
Data Source
AI summary
The present invention relates to a channel accessing method and device in a wireless communication system and, particularly, to a channel accessing method and device for a call handover for a terminal in a wireless communication system using a plurality of beams. The method according to an embodiment of the present invention, as a method of controlling a macro cell base station when a terminal that is communicating with the macro cell base station performs channel access with a small cell base station in a wireless network capable of using a plurality of transmitting/receiving beams, may include the steps of: determining whether to request a channel setting for a call for the terminal to the small cell base station when a signal strength measurement report for a channel synchronized with the small cell base station is received from the terminal; providing information including at least one of recommending information on the transmitting/receiving beams of the terminal and position information on the terminal in a request message to the small cell base station when a channel setting request to the small cell base station is decided upon; stopping the transmission of data to the terminal and a set data radio bearer (DRB2) when a response message for accepting the channel setting for the terminal is received from the small cell base station; transmitting a radio resource control access reconfiguration message to the terminal to communicate with the small cell base station; and providing information on data to be transmitted and received by the terminal to the small cell base station.