UE Serving Cell Release for Cross-Cell MBS Reception
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Solution Overview
Problem
In mobile communication systems, user equipment (UE) faces challenges in efficiently receiving multicast/broadcast services (MBS) from different cells, particularly when the number of reception devices is limited, leading to difficulties in maintaining communication with one cell while receiving MBS from another cell, especially across different public land mobile networks (PLMNs).
Innovation Solution
The UE requests an MBS gap or deactivation of serving cells to perform MBS reception from a different cell by transmitting request information to the network, allowing it to configure an MBS gap or release secondary cells, thereby enabling simultaneous MBS reception from a neighboring cell while maintaining communication with the primary cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE maintains communication with multiple serving cells, then communication reliability is improved, but the ability to receive MBS from different cells deteriorates due to limited reception devices
Solution Approach 1:
The patent implements dynamic cell state management by transitioning serving cells between active and inactive states based on MBS reception requirements. The network dynamically releases or deactivates secondary cells when MBS reception is needed, and can reactivate them when not needed, making the system adaptable to changing service requirements while maintaining communication reliability.
Solution Approach 2:
The patent segments the serving cells into primary cell (PCell) and secondary cells (SCells) with different functional roles. The PCell maintains continuous communication, while SCells can be dynamically released or deactivated to free reception devices for MBS reception from different cells, thus resolving the conflict between communication reliability and MBS reception capability.
2Reliability
If the UE uses all reception devices for communication with serving cells, then communication quality is improved, but MBS reception from different cells becomes impossible
Solution Approach 1:
The patent implements dynamic resource allocation by transitioning reception devices between communication mode and MBS reception mode. When MBS reception is required, secondary cells are released or deactivated, freeing reception devices for MBS. When MBS reception is not needed, cells can be reactivated, ensuring communication quality is maintained when possible.
Solution Approach 2:
The patent extracts secondary cells from the active communication set when MBS reception is needed. By releasing or deactivating SCells, the reception devices previously dedicated to these cells are freed up for MBS reception from different cells, thus enabling MBS capability without compromising primary communication through the PCell.
3Adaptability or versatility
If the UE requests release or deactivation of serving cells for MBS reception, then MBS reception capability is improved, but communication continuity may be disrupted
Solution Approach 1:
The patent segments cell functionality by designating the PCell to maintain continuous communication while SCells are released or deactivated for MBS reception. This segmentation ensures that communication continuity is preserved through the PCell even when SCells are released, thus resolving the conflict between MBS reception capability and communication continuity.
Solution Approach 2:
The network acts as an intermediary by managing the release and reactivation of cells. The network coordinates cell release/deactivation with MBS reception timing and can reactivate cells when MBS reception is complete, ensuring smooth transitions that maintain communication continuity while enabling MBS reception capability.
4Adaptability or versatility
If the UE configures MBS gap to receive MBS from different cell, then MBS reception is enabled, but unicast communication during gap period is interrupted
Solution Approach 1:
The patent implements periodic MBS gap configuration where gaps are created at specific intervals to allow MBS reception from different cells. These gaps are periodically repeated, enabling the UE to receive MBS services while maintaining unicast communication during non-gap periods. The periodic nature minimizes overall communication interruption while enabling MBS reception capability.
Solution Approach 2:
The patent dynamically configures MBS gaps based on MBS service requirements. The network can adjust gap timing, duration, and frequency based on the specific MBS service being received, optimizing the balance between MBS reception capability and unicast communication interruption. This dynamic adjustment minimizes communication loss while enabling MBS reception.
Data Source
AI summary
A communication method used in a mobile communication system providing a multicast/broadcast service (MBS) includes the steps of communicating, by a user equipment to which a plurality of serving cells are configured, with a network by using the plurality of serving cells; and transmitting, by the user equipment to the network, request information where the user equipment requests release or deactivation of any of the plurality of serving cells, in order to perform MBS reception of a different cell different from the plurality of serving cells.