Unified PDCP Entity for Wireless Data Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently handling mobile data transmissions, particularly in managing packet data convergence protocol (PDCP) PDUs across different logical channels and bearers, which affects data integrity and transmission efficiency.
Innovation Solution
A communication device and method that compresses and encrypts packets using a compressor instance and PDCP entity, associating sequence numbers and bearer IDs to manage PDCP PDUs across logical channels, ensuring secure and efficient data transmission by sharing a PDCP sequence number space across bearers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate PDCP entities are used for each logical channel, then data transmission can be handled independently per channel, but device complexity and management overhead increase
Solution Approach 1:
The patent merges multiple PDCP entities into a single shared PDCP entity that handles data for multiple logical channels. The PDCP entity is configured with multiple logical channel identities and can process PDCP PDUs for different logical channels using a unified sequence number space, reducing the number of separate entities needed while maintaining independent handling capabilities.
Solution Approach 2:
The PDCP entity is designed with multi-functionality to handle multiple logical channels simultaneously. It can process encryption, compression, and sequence numbering for different logical channels using the same entity instance, making the PDCP entity universal across multiple channels rather than requiring dedicated entities for each channel.
2Reliability
If separate sequence number spaces are used for each bearer, then packet ordering and reliability can be maintained independently, but the overall transmission efficiency decreases due to fragmented sequence number management
Solution Approach 1:
The patent combines multiple bearer sequence number spaces into a single unified PDCP sequence number space. The shared PDCP entity manages one continuous sequence number counter that applies to all logical channels and bearers, eliminating the need for separate sequence number management while maintaining reliable packet ordering through the unified numbering scheme.
3Adaptability or versatility
If multiple PDCP entities are configured for carrier aggregation and dual connectivity, then data can be transmitted across multiple carriers and connections, but the management overhead and processing complexity increase
Solution Approach 1:
The PDCP entity is enhanced with multi-functionality to support carrier aggregation and dual connectivity scenarios. A single PDCP entity can be configured with multiple logical channel identities corresponding to different carriers and connections, allowing it to handle data transmission across multiple radio resources without requiring separate PDCP entities for each carrier or connection type.
Data Source
AI summary
A first communication device for transmitting data to a second communication device comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute the instructions stored in the storage device. The instructions comprise compressing a first packet to a first compressed packet according to a compressor instance, wherein the first packet is associated to a flow identity (ID); generating a first Protocol Data Unit (PDU) comprising the flow ID and the first compressed packet; associating a first sequence number (SN) to the first PDU; encrypting the first PDU to a first encrypted packet; generating a first Packet Data Convergence Protocol (PDCP) PDU comprising the first SN and the first encrypted packet; and transmitting the first PDCP PDU via a first logical channel (LC) to the second communication device.