Dynamic Shared Forward Link Channel for Multicast Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in providing multicast services due to redundant transmission of multicast data on multiple forward link channels, which limits the number of supported wireless devices and consumes excessive system resources.
Innovation Solution
Implementing a dynamic shared forward link channel that uses a common long code mask for multicast data transmission, along with reference power control bits for signal quality estimation and separate channels for user-specific signaling and reverse link power control, allowing each wireless device to adjust its receive power and maintain a reverse link connection for dynamic coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multicast data is sent on separate forward link channels to individual wireless devices, then each device can receive multicast data reliably, but system resources are consumed excessively and the number of supported devices is limited
Solution Approach 1:
The patent merges multiple separate forward link channels into a single shared forward link channel for transmitting multicast data to multiple wireless devices. Instead of allocating dedicated channels to each device, the system uses one common channel that all devices can access, thereby reducing system resource consumption while maintaining reliable data delivery through individual reverse link feedback mechanisms.
Solution Approach 2:
The shared forward link channel serves multiple wireless devices simultaneously, making it a universal resource for multicast data transmission. This multi-functional channel can be accessed by any number of wireless devices in the group, eliminating the need for device-specific channel allocations and maximizing resource utilization efficiency.
2Area of stationary object
If multicast data is transmitted on multiple forward link channels, then coverage can be extended, but resource consumption increases and device support is limited
Solution Approach 1:
The patent combines multiple transmission paths into a single shared forward link channel that serves the entire multicast group. This unified approach extends coverage to all devices in the group without requiring proportional increases in system resources, thereby maintaining high device support capacity while achieving broad geographic coverage.
Solution Approach 2:
The system dynamically manages the shared forward link channel to accommodate varying numbers of wireless devices and changing coverage requirements. The channel allocation and power control are adjusted in real-time based on device locations and channel conditions, enabling flexible coverage extension without fixed resource commitments.
3Measurement precision
If dedicated forward link channels are allocated to each wireless device for multicast, then individual signal quality can be maintained, but the number of supported devices is reduced
Solution Approach 1:
The patent merges forward link channel resources into a shared pool that serves multiple devices, while maintaining individual signal quality through separate reverse link power control channels. Each wireless device has its own power control feedback path that allows the base station to adjust the shared channel transmission to meet individual signal quality requirements without requiring dedicated forward link channels for each device.
4Reliability
If redundant transmission of multicast data is performed on multiple channels, then reliability is improved, but system resources are wasted
Solution Approach 1:
The patent eliminates redundant transmission by merging multiple forward link channel transmissions into a single shared channel transmission. The multicast data is transmitted once over the shared forward link channel, and all wireless devices in the group receive the same data stream, thereby removing the energy waste associated with duplicating transmissions across multiple channels while maintaining reliable delivery through efficient resource utilization.
Data Source
AI summary
A dynamic shared forward link channel (or “data” channel) is used to send multicast data to a group of wireless devices, e.g., using a common long code mask for the data channel. Reference power control (PC) bits are also sent on the data channel and used for signal quality estimation. A shared forward link control channel is used to send user-specific signaling to individual wireless devices, e.g., using time division multiplexing (TDM) and a unique long code mask for each wireless device. A shared forward link indicator channel is used to send reverse link (RL) PC bits to the wireless devices, e.g., using TDM. The data channel is jointly power controlled by all wireless devices receiving the data channel. The control and indicator channels are individually power controlled by each wireless device such that the signaling and RL PC bits sent on these channels for the wireless device are reliably received.