A method of serving multiple channels simultaneously by single vehicle repeater
Original Publication Date: 2016-Apr-20
Included in the Prior Art Database: 2016-Apr-20
Chen, D.J.: INVENTOR [+6]
A method of serving multiple talkgroup communication on different channel by single digital vehicle repeater, which comprising: While in idle, DVR serves all channels in list for inbound and outbound service. By detecting the activity on inbound, DVR serves the active channel for inbound and outbound service. While in call hang time, DVR serves the active channel for inbound service while serves all channel for outbound service It can prioritize the system outbound service over inbound from PSU By detecting activity from system, DVR serves active channel for outbound service while serves all channel for inbound service It can prioritize the PSU inbound service over outbound service PSU detects DVR status by checking the scheduled transmission
By Chen Dajun, Fei Xun, Feng Wen, Gong Yahui, Tian Yong, Zhao Kangkai
DVRS – Digital Vehicle Repeater System is provided for on scene communication in order to extend the coverage of public safety network. But it is limited by frequency and repeater equipment that only provides one pre-configured channel at a moment for the mission critical communication.
This paper addresses this problem and introduces a method to provide various talk group communication with prioritized scheme on different frequency channel. The DVR has multiple channels configured for multiple on scene talkgroups. It scans the inbound channels for the call request from PSUs in different talkgroup, meanwhile it also broadcasts the DVR status on each outbound channel for PSUs in different TG to know it is available or conflict.
This makes PSU can steer the DVR channel for different talkgroup to satisfy on scene communication with just single repeater. It can also satisfy prioritization among multiple talkgroup that inbound proxy over outbound proxy for emergency communication.
A DVRS includes a DVR and a mobile radio (MSU) allows field portables(PSU) be used in areas where only MSU is FNE covered. DVR provides multiple configured channels that serves different group of PSUs to communicate with corresponding system through MSU channels. Accordingly, DVRS need to be manually tuned to the specific channel to align with that of the serving PSUs beforehand. Upon finishing setting up, only current selected DVR channel is served for only one group of PSUs on the specific programmed frequency with specific signal/audio type.
In the field there are multiple groups of SUs existing which land on different channels / frequencies. The current DVRS has these problems:
One DVRS can serve only one pre-configured channel. Even when there is no traffic in this channel the DVRS doesn’t serve other channels.
The DVRS needs to be manually tuned to other channels / frequencies to support a new group of SUs. This is shown in below diagram Fig-1.
This paper provides a solution for of a DVR to dynamically serve different TG PSUs on different channel, which comprising of:
· DVR monitors and presents status on multiple channels in idle: all channels are served for inbound and outbound service.
· DVR serves in active for a inbound call: The active channel is served for inbound and outbound service
· DVR serves in hang time: The active channel is served for inbound service while all channels are served for outbound service
· DVR serves in active for outbound call: The active channel is served for outbound service while all channels are served for inbound service
· PSU detect out of range.
1. DVR status broadcast packet format
STS_BCST is signaling packet that DVR periodically sends to PSUs for the presence and status.
DVR transmits STS...