eMBMS Service Continuity on Non-Self-Standing Carrier
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining service continuity when evolved multimedia broadcast multicast service (eMBMS) is supported on a non-self-standing carrier frequency, as UEs are not aware of the associated base carrier for system and MBMS-notification information, leading to difficulties in camping on or connecting to non-self-standing carriers.
Innovation Solution
A method where a UE receives information about available MBMS services on a non-self-standing carrier frequency and associated primary component carrier (PCC) frequencies, allowing it to prioritize and select a PCC frequency for obtaining necessary information to receive eMBMS services, with network entities providing necessary information to UEs to ensure seamless service continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If eMBMS service is provided on a non-self-standing carrier frequency, then spectral efficiency is improved, but UEs cannot camp on or connect to the carrier because they are not aware of the associated base carrier
Solution Approach 1:
The patent introduces an intermediary information structure (SIB15 and MBMS service information) that mediates between the non-self-standing carrier and the UE. This intermediary carries the association relationship between the non-self-standing carrier frequency and the base carrier frequency, enabling UEs to indirectly access the non-self-standing carrier through the base carrier without requiring direct system information broadcasting on the non-self-standing carrier itself.
2Loss of information
If system information is broadcast on the non-self-standing carrier, then UE can obtain MBMS service information directly, but the carrier requires additional resources and cannot remain non-self-standing
Solution Approach 1:
The patent extracts the system information broadcasting function from the non-self-standing carrier and relocates it to the base carrier. Specifically, SIB15 containing MBMS service information is broadcast on the base carrier, while the non-self-standing carrier focuses solely on providing MBMS data transmission. This separation allows the non-self-standing carrier to remain resource-efficient while UEs can still obtain necessary information.
3Reliability
If UEs monitor multiple PCC frequencies for MBMS service continuity, then service continuity is maintained during handover, but energy consumption increases
Solution Approach 1:
The patent applies preliminary action by having UEs pre-obtain and store MBMS service information, including the list of PCC frequencies associated with the non-self-standing carrier, during the initial connection phase. This preliminary information acquisition enables UEs to efficiently monitor only relevant frequencies during handover without needing to extensively scan multiple frequencies, thereby reducing energy consumption while maintaining service continuity.
Data Source
AI summary
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be a UE. The UE receiving information indicating an available MBMS service, a non-self-standing carrier frequency on which the available MBMS service is provided, and one or more PCC frequencies to which the non-self-standing carrier frequency is attached. The UE selects a preference for one PCC frequency of the one or more PCC frequencies in order to obtain information for receiving the available MBMS service on the non-self-standing carrier frequency. The UE receives the available MBMS service on the non-self-standing carrier frequency based on the obtained information.