Forward Channel Sharing via Multi-User Packets in TDMA Systems
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Solution Overview
Problem
Time division wireless communication systems face severe time delay and bandwidth waste as the number of groups increases, limiting the capacity for voice communication and data throughput in trunked communication systems.
Innovation Solution
Implementing a method for forward channel sharing using multi-user packet (MUP) technology, where user data is packed into sub-packets identified by a unique MACIndex, allowing multiple users to share a forward channel and time slots, enabling efficient data transmission and reducing time delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed time slots are allocated to specialized groups, then group calling service is provided, but system time delay increases and bandwidth is wasted when the number of groups increases
Solution Approach 1:
The patent segments the forward channel into multiple sub-channels, allowing dynamic allocation of channel resources to different groups. Instead of assigning fixed time slots to each group, the system divides the channel into segments that can be dynamically assigned based on current traffic needs, reducing time delay while maintaining group calling functionality.
Solution Approach 2:
The patent implements dynamic channel allocation where time slots are not fixed to specific groups but are dynamically assigned based on real-time traffic conditions. The base station controller can flexibly allocate channel resources to different groups as needed, preventing the time delay accumulation that occurs with static allocation schemes.
2Adaptability or versatility
If fixed time slots are allocated to specialized groups, then group calling service is provided, but bandwidth is wasted when the number of groups increases
Solution Approach 1:
The patent makes the forward channel universal by creating a shared pool of channel resources that can serve multiple groups simultaneously. Instead of dedicating specific time slots to specific groups, the system creates a multi-functional channel structure where any group can access the channel when needed, maximizing bandwidth utilization and eliminating waste.
Solution Approach 2:
The patent implements dynamic bandwidth allocation where the amount of bandwidth assigned to each group varies based on current traffic demands. When a group has active traffic, it receives the necessary bandwidth; when idle, the bandwidth is released back to the pool for other groups to use, thereby eliminating bandwidth waste while maintaining group calling service.
3Reliability
If TDMA scheme is used, then digital trunked communication is achieved, but capacity is limited and data throughput is low
Solution Approach 1:
The patent transitions from traditional time-domain multiplexing to a multi-dimensional channel structure by introducing sub-channels and virtual channels in addition to physical time slots. This dimensional expansion allows multiple data streams to be transmitted simultaneously through different channel dimensions, dramatically increasing data throughput while maintaining the reliability of digital trunked communication.
Data Source
Figure 1~2
AI summary
A method for realizing forward channel sharing in time division communication system, which completes group configuration at the cluster control service center server and modifies the attributes of all the users to enable the users to support multi-user packet MUP service, including: (a) the cluster user initiates a group call; the access network allocates a unique group identifier MACIndex for the group call after receiving the call request from the calling cluster user and informs all of the users within the group about this MA-Clndex (201); (b) after the communication starts (202), the access network packets the user data of one or more groups with multi-user packet MUP, packets the user data of each group into one sub-packet and does scheduling, then transmits the packets through forward channel (203); (c) after receiving the MUP packets from the forward channel, the cluster user looks into the MUP packets for the sub-packet that matches the MACIndex of its group, thereby realizing group communication (204). The present method solves the problem of system delay and supports even more groups.