Radio Acknowledgment Resource Sharing for VoIP Capacity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current radio communication systems, such as UMTS, face inefficiencies in using limited radio resources when transmitting voice data and low-rate packet data services, particularly due to the allocation of dedicated resources for ACK/NACK signaling, which limits the capacity for user data transmission.
Innovation Solution
The method involves using a time-division multiplex approach to share radio resources, where data packets from multiple terminals are acknowledged at different times using the same resource, reducing the required radio resource usage by 1/10 for VoIP data transmission, and allowing a single physical resource to suffice for acknowledgments in the downlink direction for up to 100 users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated resources are allocated for ACK/NACK signaling in E-HICH channel, then reliable data transmission is ensured, but radio resource efficiency deteriorates
Solution Approach 1:
Multiple users share a common acknowledgment resource instead of each user having a dedicated resource. The base station transmits acknowledgments for multiple users on the same physical channel using code division multiplexing, where each user's acknowledgment is coded with a unique signature sequence. This merging of resources significantly reduces the number of dedicated resources needed while maintaining reliable acknowledgment transmission for all users.
Solution Approach 2:
A single physical E-HICH resource serves multiple users simultaneously for acknowledgment transmission. The same physical channel and time resources are universally used by all users sharing the common acknowledgment resource, with user identification achieved through orthogonal signature sequences rather than dedicated physical channels.
2Reliability
If each user is assigned a dedicated E-HICH resource, then acknowledgment transmission is reliable, but the number of addressable users per physical channel is limited
Solution Approach 1:
Multiple users are combined into a single common acknowledgment resource, allowing many users to share one physical E-HICH channel. The combining is achieved through code division multiplexing with orthogonal signatures, enabling the system to address far more users than the number of available physical channels.
Solution Approach 2:
The system transitions from spatial/resource dimension multiplexing (dedicated physical channels for each user) to code dimension multiplexing (orthogonal signature sequences). This dimensional change from physical resource allocation to code sequence allocation dramatically increases the number of addressable users while maintaining reliable acknowledgment transmission.
3Quantity of substance
If multiple users share a common acknowledgment resource, then radio resource efficiency is improved, but signal superimposition may occur
Solution Approach 1:
Each user's acknowledgment signal is assigned a unique local quality characteristic in the form of an orthogonal signature sequence. These locally distinct code properties ensure that even when multiple users transmit simultaneously on the same physical resource, their signals remain distinguishable at the receiver through correlation processing with the respective signature sequences.
Solution Approach 2:
All users share the same physical channel characteristics (frequency, time, power levels) but are differentiated by orthogonal code sequences. This homogeneity in physical resource usage combined with code-based differentiation allows efficient resource utilization while preventing signal superimposition through the orthogonality property of the signatures.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a method for transmitting data in packets in a radio communications system, according to which the receipt of data packets from at least two terminals (UE1, UE2) is confirmed by a base station (NB1) of the radio communications system. The confirmation of receipt takes place with a time interval, using identical resources.