Relay Device Service Identifier to PPP Mapping for Downlink Priority
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Solution Overview
Problem
Existing data priority obtaining methods are inadequate for downlink transmission of MBMS and unicast data, as they cannot be applied effectively due to insufficient Quality Class Identifiers (QCIs) and lack of information about application layer priorities.
Innovation Solution
A data transmission method that involves obtaining a service identifier from downlink data, pre-configuring a mapping relationship between the service identifier and per packet priority (PPP) information, and using this information to forward data according to priority, allowing for accurate and efficient transmission of both unicast and multicast data without requiring a traffic class or differentiated services code point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing QCI-based priority mapping method is used, then unicast data transmission can be supported, but MBMS data transmission cannot be supported due to insufficient QCIs and lack of application layer priority information
Solution Approach 1:
The patent segments the priority information handling by introducing separate mapping relationships for different data types: one mapping relationship for unicast data (using QCI to PPP) and another for MBMS data (using TMGI to PPP). This allows each data type to be handled with the appropriate priority determination method, resolving the contradiction between supporting multiple data types and maintaining accurate priority information.
Solution Approach 2:
The patent introduces a new intermediary element - the TMGI (Temporary Mobile Group Identity) - as the key for MBMS data priority mapping. Instead of relying on the QCI-based mechanism that works for unicast data, the TMGI serves as a dedicated identifier for MBMS services, enabling the relay device to obtain correct PPP information for MBMS data through a separate mapping relationship.
2Measurement precision
If a fixed mapping relationship between QCI and PPP is used, then unicast data priority can be determined, but the limited number of QCIs is insufficient to provide one-to-one correspondence with all application layer priorities
Solution Approach 1:
The patent changes the key parameter used for priority determination from QCI to TMGI for MBMS data. By using TMGI as the mapping key instead of QCI, the system can provide more granular priority control for MBMS services, as each TMGI can be uniquely associated with specific MBMS data and its required priority level, thus achieving better priority precision without being constrained by the limited QCI pool.
3Ease of operation
If the relay device processes data according to a fixed priority sequence, then simple processing is possible, but it cannot adapt to different application layer priorities when multiple data types are transmitted
Solution Approach 1:
The patent introduces dynamic adaptability by enabling the relay device to select different priority determination methods based on the data type. The relay device dynamically switches between the QCI-based mapping (for unicast data) and TMGI-based mapping (for MBMS data), allowing it to maintain simple processing for each individual data type while achieving versatile priority handling across multiple data types.
Data Source
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AI summary
The present invention provides a data transmission method, a device, and a system. The method includes: receiving, by a relay device, first downlink data sent by a gateway; obtaining a first service identifier of the first downlink data; obtaining, according to a first mapping relationship between a service identifier and per packet priority PPP information, first PPP information corresponding to the first service identifier; and forwarding, by the relay device, the first downlink data to a remote device according to the first PPP information. PPP information of a downlink data packet can be accurately and quickly obtained, and a rate and accuracy of downlink data transmission are improved.