Base Station Addressing Space Expansion via Training Sequence Segmentation
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Solution Overview
Problem
The existing wireless communication networks, such as GERAN, face limitations in addressing a vast number of devices due to the limited Temporary Flow Identity (TFI) and Uplink State Flag (USF) values, which restrict the number of concurrent Temporary Block Flows (TBFs) that can share radio resources, posing a challenge as the network anticipates an increase in Machine Type Communication (MTC) devices.
Innovation Solution
The solution involves assigning different training sequences to multiple TBFs sharing the same TFI, PDCH, or USF, allowing for increased addressing space without impacting existing technical specifications, enabling more devices to be supported simultaneously by reusing USF and TFI values within the same Packet Data Channel (PDCH) using different training sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the same TFI and USF values are reused for multiple TBFs, then the addressing space is increased and more devices can share radio resources, but the ability to uniquely identify individual TBFs is compromised
Solution Approach 1:
The patent segments the identification mechanism by introducing a new dimension (cyclic shift value) that divides the addressing space into multiple independent segments. Each TBF is identified by a combination of shared resources (TFI, USF) plus a unique segmenting parameter (cyclic shift value), allowing multiple TBFs to share the same TFI/USF while maintaining unique identification through the cyclic shift dimension.
Solution Approach 2:
The patent adds another dimension to the addressing space by introducing cyclic shift values as a fourth dimension beyond the traditional TFI and USF parameters. This dimensional expansion allows the system to address more devices by combining the existing resource allocation dimensions with the new cyclic shift dimension, effectively multiplying the total addressing capacity.
2Productivity
If more TBFs are allowed to share the same PDCH, then the network capacity for MTC devices is increased, but the complexity of managing and identifying concurrent TBFs increases
Solution Approach 1:
The patent implements self-service by having each TBF automatically distinguished through its assigned cyclic shift value without requiring additional signaling or complex management procedures. The cyclic shift parameter enables each TBF to self-identify and be uniquely addressed through simple signal processing (correlation with specific cyclic shifts), reducing the management complexity while increasing capacity.
3Quantity of substance
If the TFI field size is increased to provide more unique identifiers, then more devices can be addressed, but the overhead in control signaling increases and legacy terminal compatibility is lost
Solution Approach 1:
The patent makes the cyclic shift parameter multi-functional by using it both for signal processing purposes (orthogonal spreading, interference reduction) and for addressing/identification purposes. This universal use of the cyclic shift parameter allows the system to increase addressing capacity without adding separate overhead fields, as the same parameter serves dual functions in both signal processing and device identification.
Data Source
AI summary
A method, in a base station subsystem (10), of allocating radio resources to mobile stations (20) in a wireless communication system (1) involves the base station subsystem (10) assigning a respective Temporary Block Flow (TBF) to each mobile station (20) in a cell (40) in the communication system (1), and then assigning to each TBF a Temporary Flow Identity (TFI), at least one Packet Data Channel (PDCH), and an Uplink State Flag (USF) if the TBF is an uplink TBF. The base station subsystem (10) then selects different training sequences from a plurality of available training sequences and assigns a respective different selected training sequence to two or more TBFs wherein these two or more TBFs share the same assigned Temporary Flow Identity (TFI), the same assigned Packet Data Channel (PDCH), and/or the same assigned Uplink State Flag (USF) if the TBF is an uplink TBF.