Service Data Scrambling Using Service Characteristics
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Solution Overview
Problem
In LTE networks, when multiple pieces of different MBMS service data are simultaneously transmitted in the same MBMS area, significant interference is generated due to the use of the same scrambling sequences for different data, even though the data is distinct.
Innovation Solution
A service data scrambling method that uses a service characteristic, such as a service identity, public land mobile network identity, or scheduling group radio network temporary identifier, along with an MBSFN area identity and radio timeslot number, to generate unique scrambling sequences for each piece of service data, reducing interference by ensuring distinct scrambling sequences for different service data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the same scrambling sequence is used for multiple different MBMS service data transmissions in the same MBSFN area, then the system complexity is reduced and ease of operation is improved, but interference between different service data increases significantly
Solution Approach 1:
The patent applies local quality by making the scrambling sequence specific to each service data transmission through the service characteristic parameter. Instead of using a uniform scrambling sequence across all MBMS services, each service data gets a locally optimized scrambling sequence that includes its unique service characteristic, thereby reducing interference while maintaining systematic organization.
Solution Approach 2:
The patent changes the parameters used to generate scrambling sequences by introducing the service characteristic as an additional parameter. The scrambling sequence is now generated based on multiple parameters including the service characteristic, MBSFN area identity, and radio timeslot number, rather than relying on a single uniform parameter set. This parameter differentiation resolves the interference issue while preserving operational simplicity.
2Object-affected harmful factors
If different scrambling sequences are generated for each piece of service data using service-specific parameters, then interference between service data is reduced, but the complexity of the scrambling system increases
Solution Approach 1:
The patent segments the scrambling sequence generation process by dividing it into distinct parameter components: service characteristic, MBSFN area identity, and radio timeslot number. Each component contributes a specific part to the final scrambling sequence, allowing the system to manage complexity through structured segmentation rather than monolithic sequence generation.
Solution Approach 2:
The patent achieves universality by creating a multi-functional scrambling sequence generation mechanism that handles multiple services simultaneously. The same generation process works for different service characteristics, MBSFN areas, and timeslots, providing a universal solution that reduces interference across diverse service data transmissions without requiring separate mechanisms for each service.
3Ease of operation
If a common scrambling code is used among cells providing MBMS service, then network coordination and resource management are simplified, but interference from peripheral MBSFN areas and other UEs increases
Solution Approach 1:
The patent applies local quality by incorporating the service characteristic into the scrambling sequence, making each service's scrambling properties locally optimized for its specific transmission needs. This local differentiation reduces interference from other services and UEs while maintaining the coordinated structure of the MBMS network.
Solution Approach 2:
The patent introduces dynamics by making the scrambling sequence variable based on service characteristic, MBSFN area identity, and radio timeslot number. This dynamic adaptation allows the system to respond to different service requirements and transmission conditions, reducing interference from peripheral areas and other UEs while maintaining network coordination.
Data Source
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AI summary
The present invention discloses a service data scrambling method, a service data descrambling method, an apparatus, and a system, and relates to the communications field. The service data scrambling method includes: receiving service data; using a service characteristic corresponding to the service data as a part of a scrambling parameter; generating a scrambling sequence according to the scrambling parameter; scrambling the service data according to the scrambling sequence; and sending the service data. According to the present invention, a service characteristic, an MBSFN area identity, a radio timeslot number, and the like are used as scrambling parameters to generate a scrambling sequence, and the service data is scrambled according to the generated scrambling sequence, thereby resolving a problem that relatively great interference is generated when multiple pieces of different service data are simultaneously transmitted in a same service area, and achieving an effect that interference between different service data sent simultaneously in the same service area can be reduced to a great extent.