MBMS Frequency Selection via Probability Factor and Timer
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Solution Overview
Problem
In MBMS systems, uplink signaling congestion occurs when user equipments in non-preferred frequency layers simultaneously move to a preferred frequency layer at the start of a multimedia broadcast/multicast service session, leading to inefficient resource management.
Innovation Solution
A method and apparatus that utilize a probability factor (PF) value and a timer value to control the frequency selection of user equipments, decentralizing the time points of cell reselection by requiring UEs in non-preferred frequency layers to perform a PF test before moving to the preferred frequency layer, thereby preventing simultaneous access and reducing congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs in non-preferred frequency layers simultaneously move to preferred frequency layer at MBMS service start, then MBMS service delivery is enabled, but uplink signaling congestion occurs
Solution Approach 1:
The patent introduces periodic time-based control mechanisms where UEs perform PF tests at intervals determined by a timer value. This periodic action distributes the frequency layer transitions over time rather than allowing simultaneous movements, thereby resolving the uplink congestion issue while maintaining MBMS service delivery capability
Solution Approach 2:
The patent dynamically adjusts the probability factor (PF) value and timer value parameters to control UE behavior. By changing these parameters, the system can regulate the rate and timing of frequency layer transitions, balancing service delivery efficiency with congestion prevention
2Object-generated harmful factors
If UEs perform frequent PF tests to control frequency selection, then uplink congestion is reduced, but signaling overhead increases
Solution Approach 1:
The patent implements partial action by requiring PF tests only from UEs in non-preferred frequency layers who need to transition to preferred layers. The probability factor (PF) value controls the proportion of UEs performing tests at any given time, optimizing the balance between congestion control and signaling overhead
Solution Approach 2:
The probability factor (PF) value acts as an intermediary parameter that mediates between congestion control requirements and signaling overhead. By adjusting PF, the system can fine-tune the number of PF tests performed, achieving optimal balance without requiring excessive signaling
Data Source
AI summary
A method and an apparatus are disclosed for applying frequency layer convergence (FLC) to connected mode user equipments (UE) having no dedicated channel for a multimedia broadcast/multicast service (MBMS) service in a mobile communication system employing a Code Division Multiple Access (CDMA) scheme. The method and apparatus prevent uplink signaling congestion which may occur when the UEs located in non preferred frequency layers (NPL) of the MBMS service move to a preferred frequency layers (PL) when a MBMS service session starts. If the MBMS service session starts in a situation of applying the FLC, a radio network controller (RNC) notifies the UEs desiring to receive the MBMS service and located in NPLs for the MBMS service of FLC information including a PF value and a timer value, with reference to the number of the NPL UEs joining the MBMS service. The UEs performs a PF test according to the PF and timer values, thereby maintaining the degree of congestion and signal transmission load at appropriate levels.