Mobile Station UE Category Notification for LTE Communication Control
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Solution Overview
Problem
In the LTE system, if 'UE category 7a-7c' is notified only in the uplink or downlink, the radio base station cannot determine how to perform communication control on the mobile station for which 'UE category 7a-7c' has not been notified, leading to incomplete communication control.
Innovation Solution
A mobile station that notifies the radio base station of UE categories for different generations (Release-8, Release-10, and Release-12) for both uplink and downlink, and a radio base station that receives these notifications to perform communication control based on supported UE categories, falling back to earlier generations when newer categories are not supported.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the mobile station notifies only the uplink or downlink UE category for Release-12, then the notification overhead is reduced, but the radio base station cannot determine how to perform communication control for the direction without notification
Solution Approach 1:
The mobile station performs preliminary action by notifying the radio base station of Release-8 or Release-10 UE category in advance, before the need arises for Release-12 category notification. This ensures that the base station always has a fallback category to use for communication control, even when Release-12 category is not notified for a particular direction.
Solution Approach 2:
The Release-8 or Release-10 UE category acts as an intermediary between the incomplete Release-12 category information and the communication control function. When Release-12 category is not notified for a direction, the base station uses the intermediary Release-8/10 category to perform communication control, bridging the information gap.
2Ease of operation
If the mobile station notifies UE category for all generations in both uplink and downlink, then the radio base station can perform complete communication control, but the notification overhead increases
Solution Approach 1:
The mobile station applies local quality by notifying Release-12 UE category only for the directions (uplink or downlink) where it is actually supported and needed, rather than uniformly notifying for both directions. This localized notification approach reduces overhead while maintaining adequate communication control capability for each direction.
Solution Approach 2:
The mobile station performs partial action by notifying only the necessary subset of UE category information (Release-12 for supported directions, plus fallback Release-8/10 categories) rather than providing complete information for all generations in both directions. This partial notification is sufficient for the base station to perform communication control.
3Quantity of substance
If the mobile station does not notify Release-12 UE category for a specific direction, then the notification message size is reduced, but the radio base station lacks information for optimal communication control in that direction
Solution Approach 1:
The mobile station performs preliminary action by including Release-8 or Release-10 UE category in the notification message in advance. This ensures that even when Release-12 category is omitted for a specific direction, the base station has pre-provided fallback information to perform communication control with acceptable reliability.
Solution Approach 2:
The fallback Release-8/10 UE category serves as beforehand cushioning against the potential loss of communication control accuracy. When Release-12 category is not notified for a direction, this pre-prepared fallback information cushions the impact, allowing the base station to maintain communication control functionality.
Data Source
AI summary
Even if “UE category” is notified of only in an uplink (or a downlink), a radio base station eNB can suitably perform a communication control on a mobile station UE in the downlink (or the uplink) for which “UE category” is not notified of. In the mobile station UE according to the present invention, when the mobile station UE does not support “UE category for Release-12” in the uplink, a transmitting unit 12 does not notify of “UE category for Release-12” corresponding to the uplink, and when the mobile station UE does not support “UE category for Release-12” in the downlink, the transmitting unit 12 does not notify of “UE category for Release-12” corresponding to the downlink.