MBMS Dedicated Carrier Synchronization via Control Slot Preamble
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Solution Overview
Problem
Current MBMS dedicated carrier systems lack an effective method for user equipment to access and synchronize with the MBMS dedicated carrier, which is essential for providing multimedia broadcast and multicast services, especially in TD-SCDMA systems, where handset user equipment can only receive broadcast television programs and not both broadcast television and voice services.
Innovation Solution
The proposed solution involves an access method and apparatus that synchronizes user equipment to the MBMS dedicated carrier by detecting the preamble of the control time slot, calculating phase differences between control and service time slots, and determining the start-frame for system message transmission, utilizing the MBMS dedicated carrier information and pilot signals to achieve frame synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a dedicated carrier is established for MBMS transmission, then the transmission rate of MBMS data is improved, but the device complexity increases due to the need for separate synchronization and access methods
Solution Approach 1:
The patent applies universality by enabling handset user equipment to access both the dedicated MBMS carrier and the ordinary TD-SCDMA carrier simultaneously. The synchronization method uses universal preamble detection mechanisms that work across both carrier types, allowing a single device to perform multiple functions (MBMS reception and voice service) without requiring separate dedicated hardware for each carrier type.
2Object-affected harmful factors
If frequency isolation is used between MBMS dedicated carrier and TD-SCDMA system, then interference is reduced, but the ease of operation decreases as handset equipment cannot access both carriers effectively
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of a control time slot that bridges the dedicated MBMS carrier and the ordinary TD-SCDMA carrier. This control time slot contains synchronization information that acts as a mediator, allowing handset equipment to synchronize with the dedicated carrier while maintaining the ability to access both carriers effectively despite frequency isolation.
3Measurement precision
If the control time slot preamble is used for synchronization, then the measurement precision of frame structure is improved, but the loss of time increases due to the need for continuous preamble detection and phase difference calculation
Solution Approach 1:
The patent applies preliminary action by pre-configuring the control time slot with known preamble sequences and phase difference characteristics. The synchronization method uses these pre-established parameters to quickly determine the start frame without requiring continuous real-time detection, thereby reducing the time loss while maintaining high measurement precision through the use of pre-known synchronization patterns.
Data Source
AI summary
An access method of MBMS on dedicated carrier relates to MBMS access technology on dedicated carrier, including: synchronize a user equipment to a MBMS dedicated carrier; the user equipment detects a start-frame of system message on the MBMS dedicated carrier; and the terminal monitors the system message from the start-frame of system message. An apparatus of realizing the method is also provided.