Direct Base Station Packet Data Bearer for Wireless Networks
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Solution Overview
Problem
Current wireless networks, such as cdma2000 RANs, experience delays and jitter when supporting streaming data applications due to the need for packet data transmissions to pass through the packet data serving node (PDSN), which is unnecessary and increases call setup time and decreases success rates for mobile station-to-mobile station (MS-MS) packet data calls, especially in wide-area networks with multiple base stations.
Innovation Solution
Modifying radio access network (RAN) signaling messages to enable direct packet data call connections between mobile stations via a local IP network connecting base stations, allowing a first base station to establish a packet data bearer connection with a second base station without requiring a packet data serving node, and facilitating handoffs between base stations to maintain the connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet data transmissions pass through the PDSN to enable MS-MS packet data calls, then the calls can be established using existing RAN signaling messages, but delays and jitter increase and call setup time increases
Solution Approach 1:
The patent extracts the PDSN from the data path for MS-MS calls, allowing base stations to communicate directly with each other for packet data transmissions. The PDSN is removed from the intermediate path between source and destination mobile stations, eliminating unnecessary routing through the packet data serving node and reducing call setup time and delays.
Solution Approach 2:
The patent introduces a direct base station-to-base station communication path as an intermediary solution, bypassing the traditional PDSN-mediated route. This direct path enables faster establishment of MS-MS packet data calls while maintaining network control and management capabilities.
2Reliability
If packet data transmissions pass through the PDSN to enable MS-MS packet data calls, then network control and management are maintained, but delays and jitter increase
Solution Approach 1:
The PDSN is extracted from the direct data transmission path between base stations, allowing high-speed packet data exchanges to occur directly between BSs. Network control and management functions remain with the PDSN, but the actual data transmission occurs through the faster direct path, eliminating delays and jitter.
Solution Approach 2:
The patent segments the network functions into control/management (handled by PDSN) and data transmission (handled by direct BS-BS connection). This segmentation allows the control plane to remain centralized while the data plane operates at higher speeds through direct base station connections.
3Loss of time
If a single base station serves both mobile stations for MS-MS packet data calls, then the call can be established without PDSN connection, but the solution is limited to small wireless networks
Solution Approach 1:
The patent creates a universal solution that works for both single-base-station and multi-base-station scenarios. The direct BS-BS communication mechanism can be applied regardless of network size or topology, making the solution scalable from small home/office networks to large wide-area networks while maintaining low call setup times.
Solution Approach 2:
The patent extends the direct MS-MS call capability from the single-base-station dimension to the multi-base-station dimension by establishing direct communication paths between different base stations. This dimensional extension allows the solution to scale across wide-area networks while maintaining the benefits of direct communication.
4Speed
If direct BS-BS packet data connections are established without PDSN, then latency and jitter are reduced, but existing RAN signaling messages must be modified
Solution Approach 1:
The patent performs preliminary modification of RAN signaling messages to support direct BS-BS packet data connections. By pre-adapting the signaling infrastructure, the system enables direct high-speed data transmission between base stations without requiring complex real-time modifications or additional signaling protocols during call establishment.
Data Source
AI summary
A wireless network that provides a packet data call connection between a source mobile station (MS) and a destination mobile station (MS) in a coverage area of the wireless network. The wireless network comprises a first base station that wirelessly communicates with the source mobile station, a second base station that wirelessly communicates with the destination mobile station, and a mobile switching center that connecting the first and second base stations. The first base station receives a first message from the source mobile station requesting a MS-MS packet data call connection to the destination mobile station. In response to the first message, the first base station initiates establishment of the MS-MS packet data call connection on a local IP network coupling the first and second base stations.