A-GNSS positioning in wireless mesh communication system
The application relates to a wireless mesh communication system ( 100 ) that comprises a plurality of radio nodes ( 102, 104, 106 ). Each of the plurality of radio nodes is configured to provide a bi-directional radio communication with other radio node ( 102, 104, 106 ) of the system and to obtain ( 213, 216, 224 ) an assisted GNSS (A-GNSS) assistance data used in a global navigation satellite system (GNSS) positioning. Also, at least one ( 102, 104 ) of the radio nodes indicates ( 230 ) to other radio nodes ( 102, 104, 106 ) of the system that the A-GNSS assistance data is available and transmissible on request, if the at least one of the radio nodes has this A-GNSS assistance data.
1. A wireless mesh communication system comprising:
a plurality of radio nodes;
wherein each of the plurality of radio nodes is configured to provide a bi-directional radio communication with other radio node of the system and to obtain an assisted GNSS (A-GNSS) assistance data used in a global navigation satellite system (GNSS) positioning, and
wherein at least one of the radio nodes sends an indication to other radio nodes of the system that the A-GNSS assistance data is available and transmissible on request, if the at least one of the radio nodes has this A-GNSS assistance data.
2. The system according to claim 1 , wherein a first radio node belonging to the plurality of radio nodes obtains its location by means of its GNSS receiver without the A-GNSS assistance data, if the first radio node lacks the A-GNSS assistance data and it is not available from a second radio node belonging to the plurality of radio nodes, whereupon this positioning results an A-GNSS assistance data obtained by the first radio node.
3. The system according to claim 2 , wherein the first radio node sends the A-GNSS assistance data to at least the second radio node, which lacks the A-GNSS assistance data.
4. The system according to claim 1 , wherein each of the plurality of radio nodes having the A-GNSS assistance data broadcasts an availability indication that indicates an availability of the A-GNSS assistance data and that the A-GNSS assistance data is sent on request.
5. The system according to claim 1 , wherein each of the plurality of radio nodes sends an unavailable response indication, which indicates that it lacks the A-GNSS assistance data, to an A-GNSS assistance data request, if it lacks the A-GNSS assistance data.
6. The system according to claim 2 , wherein the first radio node sends the A-GNSS assistance data on request to a third radio node belonging to the plurality of radio nodes, which also is configured to provide the bi-directional radio communication and to obtain the A-GNSS assistance data, if the second radio node has the A-GNSS assistance data.
7. The system according to claim 2 , wherein the first radio node sends an A-GNSS assistance data request towards the second radio node, which operates as a sink radio node of the system, if the first radio node lacks the A-GNSS assistance data.
8. The system according to claim 7 , wherein the first radio node sends the A-GNSS assistance data request, if it has received the A-GNSS assistance data request from other radio node belonging to the plurality of radio nodes.
9. The system according to claim 2 , wherein the second radio node obtains the A-GNSS assistance data from an A-GNSS assistance data provider of the system or, if it is temporarily or permanently impossible, the second radio node obtains the A-GNSS assistance data by obtaining its location by means of its GNSS receiver without the A-GNSS assistance data.
10. The system according to claim 1 , wherein the first or second radio node sends a positioning message to a fourth radio node belonging to the plurality of radio nodes, which also is configured to provide the bi-directional radio communication, but lacks a capability to perform GNSS positioning, whereupon the fourth radio node is able to perform a received signal strength indication (RSSI)-based positioning by means of positioning messages from other radio nodes of the system.
11. An A-GNSS positioning method in the wireless mesh communication system according to any of the preceding claim, comprising a step of:
sending, by at least one radio node of the system, an indication to other radio nodes of the system that the A-GNSS assistance data is available and transmissible on request, if the at least one radio node has this A-GNSS assistance data.
12. A radio node device for a wireless mesh communication system, comprising
a processor part and
a data transfer part,
which radio node device is configured
to provide, by the data transfer part, a bi-directional radio communication with at least one another radio node device and to obtain an A-GNSS assistance data used in a GNSS positioning,
wherein the radio node device is further configured to send, by the data transfer part, an indication to other radio nodes of the system that the A-GNSS assistance data is available and transmissible on request, if the radio node device has this A-GNSS assistance data.
13. An A-GNSS positioning method for the radio node device according to claim 12 in a wireless mesh communication system, comprising a step of
indicating sending, by the data transfer part of the radio node device, an indication to other radio node devices of the system that the A-GNSS assistance data is available and transmissible on request, if the radio node device has this A-GNSS assistance data.
14. A non-transitory computer readable medium embodying a program comprising instructions which, when the program is executed by a radio node device, cause the radio node device to carry out at least the step of the method according to claim 13 .