Fixed HS-DSCH Allocation Reduces VoIP Control Overhead
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Solution Overview
Problem
In mobile communications, particularly for VoIP and real-time services over WCDMA HSDPA and HSUPA, the control overhead is significant, reducing voice capacity due to the need for frequent HS-SCCH signaling, which consumes channelization codes and transmission power.
Innovation Solution
Implementing a fixed time allocation approach where the UE uses stored parameters for subsequent transmissions, reducing the need for repeated HS-SCCH/E-DPCCH signaling, and utilizing RRC signaling to allocate users and set default transport parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HS-SCCH signaling is sent with every data packet on HS-DSCH, then the UE can correctly receive and decode data packets, but the control overhead increases significantly, consuming channelization codes and transmission power, thus reducing voice capacity
Solution Approach 1:
The patent applies preliminary action by configuring the UE with default transport format parameters and fixed time allocation through RRC signaling before data transmission begins. The UE stores these parameters and reuses them for multiple packets, performing the formatting action in advance rather than repeatedly for each packet. This resolves the contradiction by maintaining reliable data reception (through stored default parameters) while significantly reducing control overhead (by eliminating repeated HS-SCCH signaling).
Solution Approach 2:
The patent implements self-service by enabling the UE to autonomously determine transport format parameters using stored default values from RRC configuration and fixed time allocation information. The UE independently formats and processes data packets without requiring continuous HS-SCCH signaling from the network, thus reducing control overhead while maintaining reception reliability through self-sufficient parameter usage.
2Productivity
If multiple VoIP packets are transmitted simultaneously to increase data rate, then control overhead per packet decreases, but the complexity of packet scheduling and resource management increases
Solution Approach 1:
The patent applies periodic action by implementing fixed time allocation for VoIP packet transmissions, where packets are sent at regular intervals with predetermined timing. This periodic structure simplifies scheduling complexity by establishing a predictable pattern, while still achieving increased data rates through simultaneous multi-packet transmission. The network and UE both benefit from the rhythmic, predictable nature of the transmissions.
Solution Approach 2:
The patent uses parameter changes by transitioning from dynamic per-packet formatting to using stored default parameters with fixed time allocation. This parameter stabilization reduces scheduling complexity while maintaining high data rates, as the system moves from complex real-time parameter negotiation to simpler predetermined parameter usage.
3Device complexity
If RRC signaling is used to allocate users and set default transport parameters, then HS-SCCH overhead is reduced for subsequent transmissions, but the initial setup time and signaling delay increase
Solution Approach 1:
The patent applies preliminary action by performing user allocation and default parameter configuration through RRC signaling before actual data transmission begins. This upfront setup, though time-consuming, eliminates the need for repeated HS-SCCH signaling during data transmission, thus reducing overall control overhead. The time investment in initial RRC configuration is offset by the significant reduction in subsequent HS-SCCH messages.
Solution Approach 2:
The patent implements continuity of useful action by establishing a long-lasting RRC configuration that remains valid for multiple data transmissions. Instead of repeating setup actions for each packet, the initial RRC signaling creates a continuous valid configuration that serves throughout the data transmission phase, reducing overall signaling time and overhead.
Data Source
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AI summary
According to an aspect of the present disclosure, there is provided a method for execution in a mobile station receiving signalling control information on a signalling channel of a radio interface between the mobile station and a radio access network in a wireless telecommunications system, comprising: reading the signalling channel; determining whether signalling information for said mobile station is present in the signalling channel; responsive to determining that signalling information for said mobile station is present, decoding a data packet on a data channel according to said signalling information; responsive to determining that signalling information for said mobile station is not present, decoding said data packet using stored parameters; and delivering decoded data to higher layers.