Absolute Grant Channel Signaling for HSUPA Scheduling
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in high-speed uplink packet access due to the need for mobile devices to monitor multiple channelization codes during soft handovers, leading to high resource usage and increased complexity, particularly in managing scheduling and signaling between mobile devices and base stations.
Innovation Solution
The implementation of a system that reduces the number of channelization codes mobile devices must monitor by using an absolute grant channel with an indicator field, allowing for 'time and rate' scheduling and supporting both small and large frame sizes, thereby optimizing resource usage and simplifying scheduling processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile devices monitor multiple channelization codes during soft handovers, then coverage and reliability are improved, but resource usage and device complexity increase significantly
Solution Approach 1:
The patent extracts the scheduling decision function from mobile devices and centralizes it in base stations. Base stations determine which channelization codes should be monitored and communicate this information to mobile devices through downlink signaling, thereby removing the burden of monitoring all possible codes from the mobile device while maintaining soft handover reliability
Solution Approach 2:
The patent introduces downlink signaling as an intermediary mechanism between base stations and mobile devices. This signaling carries scheduling information that tells mobile devices which channelization codes to monitor, acting as a mediator that coordinates the multi-code monitoring requirement with reduced device complexity
2Difficulty of detecting and measuring
If base stations continuously monitor all spreading codes for potential mobile transmissions, then detection capability is improved, but computational resource usage increases dramatically
Solution Approach 1:
The patent applies preliminary action by having base stations send scheduling decisions to mobile devices before the mobile devices transmit. This allows base stations to know in advance which codes to expect transmissions on, eliminating the need to continuously monitor all codes and reducing computational resource usage while maintaining detection capability
3Loss of information
If mobile devices decode multiple channelization codes from multiple cells, then scheduling information reception is improved, but processing time and complexity increase
Solution Approach 1:
The patent extracts the scheduling information from multiple channelization codes and consolidates it into a single dedicated downlink signaling channel. Mobile devices only need to decode this specific signaling to obtain scheduling information, reducing processing time and complexity while ensuring complete information reception
Data Source
AI summary
A wireless communication system (100) and method for providing high speed uplink packet access from user equipment (128, 130) to a base station (114, 116, 118, 120). Each of the user equipment (128, 130) and the base station (114, 116, 118, 120) includes a transmitter (1106, 1206), a receiver (1104, 1204), and a controller (1108, 1208) coupled to the transmitter and the receiver. Data packets are transmitted from the user equipment (128, 130) to the base station (114, 116, 118, 120). Control information, corresponding to the data packets, is transmitted from the base station (114, 116, 118, 120) to the user equipment (128, 130). The control information includes at least a control channel acknowledgement field in an absolute grant channel assigned to the user equipment (128, 130). The controller (1108) of the user equipment (128, 130) is configured to utilize the channelization code(s) in response to handoff and/or entering an active channel state.