TTI Bundling for Random Access Payload Efficiency
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Solution Overview
Problem
In wireless communication systems, access terminals face delays in connecting with base stations due to the limited payload size constraint of conventional 1 ms Transmission Time Intervals (TTIs), which restricts the amount of information that can be transmitted during the random access procedure, leading to inefficiencies in establishing connections.
Innovation Solution
The implementation of TTI bundling allows multiple TTIs to be combined for a scheduled transmission, enabling a larger payload to be sent within a common Transport Block, thereby increasing the efficiency and speed of the connection establishment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional 1 ms Transmission Time Intervals (TTIs) are used for scheduled transmission, then the transmission structure remains simple and manageable, but the payload size is limited which causes delays in connection establishment
Solution Approach 1:
The patent combines multiple TTIs (Transmission Time Intervals) into a single bundled TTI structure. This merging allows the scheduled transmission to carry a larger payload by aggregating the capacity of multiple time intervals, thereby enabling more information to be transmitted in one go and reducing the number of additional uplink messages needed for connection establishment.
2Reliability
If multiple additional uplink messages are sent to provide information for connection, then the base station can establish a complete connection, but the connection establishment time increases due to the sequential message exchange
Solution Approach 1:
The patent applies preliminary action by bundling multiple TTIs in advance before the scheduled transmission. This preparation allows the access terminal to include all necessary connection information (such as RRC connection request and NAS protocol data) in a single bundled transmission, eliminating the need for sequential additional uplink messages and thereby reducing connection establishment time while maintaining completeness.
3Productivity
If the payload size for scheduled transmission is increased to reduce messaging, then the connection establishment efficiency improves, but the conventional TTI structure cannot accommodate larger payloads
Solution Approach 1:
The patent introduces dynamics by making the TTI structure adaptable through bundling. The system can dynamically adjust the number of TTIs to bundle based on the payload requirements and channel conditions. This dynamic approach allows the scheduled transmission to accommodate variable payload sizes, improving connection establishment efficiency when larger payloads are needed while maintaining flexibility for different scenarios.
Data Source
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AI summary
Systems and methodologies are described that facilitate effectuating a random access procedure in a wireless communication environment. A random access preamble can be sent from an access terminal to a base station, and a random access response can be sent from the base station to the access terminal in response. The random access response can allocate resources to be utilized by the access terminal for a scheduled transmission (e.g., message 3,...). Further, a plurality of Transmission Time Intervals (TTIs) can be bundled for the scheduled transmission. Moreover, a payload of the scheduled transmission can be transmitted to the base station from the access terminal within a common Transport Block (TB) using the bundled plurality of TTIs. According to an example, employment of TTI bundling can be controlled on a per network basis, per base station basis, or per access terminal basis.