Adaptive SSB Beam Periodicity for Cellular Network Energy Saving
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Solution Overview
Problem
Current cellular wireless communication systems face significant challenges in reducing energy consumption, particularly due to unnecessary transmissions and power consumption at Base Stations (BS) that are not optimized based on network load and traffic conditions.
Innovation Solution
The proposed solution involves adapting transmission patterns of Synchronization Signal Blocks (SSB) and other signals and channels based on network parameters such as load, traffic conditions, and channel conditions. This includes varying the periodicity of SSB transmissions, reducing the number of active spatial elements, and dynamically adjusting transmit power to minimize energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic transmission of SSB is performed as a basic functionality at BS, then initial access and handover procedures are supported, but unnecessary power consumption occurs during low traffic periods
Solution Approach 1:
The patent applies dynamics by making the SSB transmission periodicity configurable and adaptable based on network conditions. The RRC parameter ssb-Periodicity is introduced to allow dynamic adjustment of SSB transmission intervals, enabling the system to transition from fixed periodic transmission to condition-based adaptive transmission, thereby reducing power consumption during low traffic while maintaining reliability when needed
Solution Approach 2:
The patent changes the parameter of SSB transmission periodicity from a fixed value to a configurable parameter (ssb-Periodicity) that can be adjusted based on network conditions. This allows the system to modify transmission characteristics dynamically, reducing power consumption by extending periodicity during low traffic periods while maintaining adequate coverage during high traffic periods
2Area of stationary object
If SSB burst transmission is performed with one SSB per beam to cover all directions, then comprehensive coverage is achieved, but energy consumption increases unnecessarily in sectors with low UE arrival rate
Solution Approach 1:
The patent applies local quality by allowing different SSB periodicity configurations for different sectors or beams based on their specific traffic conditions. The ssb-Periodicity parameter can be configured separately for different SSB bursts or beams, enabling high-traffic sectors to maintain frequent transmission while low-traffic sectors reduce their transmission frequency, optimizing both coverage and power consumption locally
3Loss of information
If all CSI-RS resources in a resource set are measured and reported by UE, then comprehensive channel state information is obtained, but unnecessary monitoring and energy consumption occur at UE when spatial elements are reduced
Solution Approach 1:
The patent applies taking out by extracting only the necessary CSI-RS resources for measurement and reporting based on the actual number of active spatial elements. When the network reduces the number of active spatial elements, the UE is instructed to measure and report only on the corresponding subset of CSI-RS resources, removing unnecessary measurements and reducing energy consumption while maintaining adequate channel state information
Data Source
AI summary
The present invention relates to method of energy saving in a cellular network. The method comprises configuring, by the Base Station (BS), different periodicity for at least one Synchronization Signal Block (SSB) beam of a plurality of SSB beams in an SSB burst, based on the load on the network. The method includes transmitting, by the BS, a relaxed signal in less number of time and frequency resources than the resources used for an SSB. The method further includes indicating sleep states of the BS to a User Equipment (UE) to reduce unwanted monitoring of resources. The method also includes determining, by the BS, active number of ports and indicating, to the UE, active ports using a parameter. The method further includes dynamically determining, by the BS, transmit power of downlink (DL) signal and DL channel, and signalling a parameter about the transmit power to the UE.