On-Demand System Information Transmission via Pilot Code Requesting
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Solution Overview
Problem
The increasing volume of System Information (SI) in LTE wireless communication leads to high power consumption and resource waste in base stations, particularly when SI is periodically broadcasted, especially with a small number of User Equipment (UE) accessing the network.
Innovation Solution
Implementing a method where User Equipment (UE) determines a requesting window to send a pilot code for second-class SI only when no other UE requests it within a predetermined time frame, allowing the base station to adjust the sending of second-class SI based on actual user requests, thereby reducing unnecessary broadcasts and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system information is periodically broadcasted by the base station, then all user equipment can receive the information reliably, but power consumption increases and frequency spectrum resources are wasted when few UEs are accessing
Solution Approach 1:
User equipment autonomously determines whether to request system information by checking the requesting window for pilot codes, eliminating the need for the base station to continuously broadcast SI to all UEs. The UE that needs information self-initiates the request process.
Solution Approach 2:
The base station opens requesting windows at periodic intervals instead of continuous broadcasting. During these windows, UEs can send pilot codes to request SI, and the base station responds only when requests are received, converting continuous periodic broadcast into intermittent on-demand transmission.
2Reliability
If system information is periodically broadcasted by the base station, then information is always available to UEs, but frequency spectrum resource utilization decreases when few UEs are accessing
Solution Approach 1:
UE autonomously monitors requesting windows and sends pilot codes only when SI is needed, converting the passive reception model into active on-demand requesting. This eliminates wasteful spectrum usage when no UE requires SI updates.
Solution Approach 2:
The base station uses feedback from pilot codes sent by UEs to determine whether to transmit SI. The presence or absence of pilot codes in the requesting window provides feedback on actual UE information needs, enabling dynamic adjustment of SI transmission.
3Loss of energy
If the base station sends second-class SI in response to pilot codes, then power consumption and resource waste are reduced, but the system complexity increases due to requesting windows and monitoring requirements
Solution Approach 1:
System information is divided into first-class SI (broadcasted periodically) and second-class SI (sent on-demand). The requesting window mechanism is segmented into specific time domains where UEs can send pilot codes, separating the information types and their transmission modes to manage complexity.
Solution Approach 2:
The base station pre-configures requesting windows with specific time domain positions and parameters before UE access. UEs are provided with template information about requesting window locations and formats in advance, allowing them to monitor and send pilot codes without real-time complex calculations.
Data Source
Figure 1A~1B
Figure 2A~3A
Figure 3B
AI summary
Related are a method, an apparatus, user equipment and a base station for sending and receiving SI. The method of receiving SI comprises: in response to receiving first-class SI broadcast by a base station, determining a requesting window, a receiving window and a pilot code of to-be-requested SI, where the requesting window includes P number of time domain sending opportunities for sending a request carrying the pilot code; monitoring a first Q number of time domain sending opportunities within the requesting window to determine whether a request carrying the pilot code is sent from UE to the base station; when no UE sends the request carrying the pilot code, sending the request carrying the pilot code at the (Q+1)-th time domain sending opportunity; and monitoring the receiving window of the to-be-requested SI for the to-be-requested SI sent by the base station. The technical solution may avoid a problem of large power consumption caused by the UE requesting the SI by sending a pilot code every time, and also greatly improve performances of sending and receiving the SI at the same time.