Frequency Channel Selection for Random Access Load Balancing
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Solution Overview
Problem
Current mobile communication systems face challenges in efficiently managing the selection of frequency channels for random access in radio terminals, particularly for machine type communication (MTC) and Internet of Things (IoT) services, which require low cost, wide coverage, and low power consumption, leading to load imbalances and inefficiencies in anchor and non-anchor carriers.
Innovation Solution
A communication control method where a base station transmits a paging message with channel identification information, allowing radio terminals to select a second frequency channel from a plurality of channels for random access, thereby distributing the load and avoiding high load or temporarily unavailable carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radio terminals use anchor carriers for random access, then connection establishment is reliable, but carrier load becomes unbalanced and anchor carriers experience high traffic
Solution Approach 1:
The patent segments the random access function by introducing non-anchor carriers that can also be used for random access procedures. This divides the previously concentrated anchor carrier functionality across multiple carriers, reducing load on anchor carriers while maintaining connection establishment reliability through multiple access options.
Solution Approach 2:
The patent changes the parameter of carrier usage by allowing non-anchor carriers to be used for random access. The base station dynamically configures which non-anchor carriers can be used for random access based on current load conditions, thereby balancing carrier traffic while maintaining reliable connection establishment.
2Ease of operation
If radio terminals randomly select frequency channels for random access, then channel selection is simple, but load distribution becomes inefficient and high load carriers cannot be avoided
Solution Approach 1:
The patent implements feedback mechanisms where the base station monitors carrier load conditions and provides guidance information to radio terminals about which non-anchor carriers are suitable for random access. This feedback enables load-aware channel selection that maintains simplicity for terminals while achieving efficient load distribution across carriers.
Solution Approach 2:
The base station performs preliminary assessment of carrier load conditions and pre-identifies suitable non-anchor carriers for random access before terminals need to select channels. This preliminary action allows the system to guide terminals toward less loaded carriers, improving load distribution efficiency while keeping terminal operations simple.
3Productivity
If multiple frequency channels are available for random access, then load distribution improves, but terminal complexity increases for channel selection
Solution Approach 1:
The patent introduces an intermediary role of the base station that manages the complexity of multi-channel selection. The base station provides guidance information and configuration data to terminals, acting as a mediator that enables efficient load distribution across multiple carriers while shielding terminals from the complexity of selecting among many channels.
Solution Approach 2:
The patent enables terminals to autonomously select appropriate non-anchor carriers for random access based on configuration information provided by the base station. Terminals use the received guidance information to independently make channel selection decisions, achieving load distribution benefits without requiring complex terminal-side channel management mechanisms.
Data Source
AI summary
A communication control method comprises a step S1 of transmitting, by a eNB 200, a paging message to a UE 100 by using a first frequency channel included in a plurality of frequency channels, a step S2 of receiving, by the UE 100, the paging message, a step S3 of selecting, by the UE 100, a second frequency channel included in the plurality of frequency channels, and a step S4 of transmitting, by the UE 100, a random access signal for establishing connection with the eNB 200 by using the second frequency channel. The paging message includes channel identification information used for selecting the second frequency channel. In the step S3, the UE 100 is configured to select the second frequency channel based on the channel identification information included in the paging message.