Wireless mesh network
Among other things, aspects, features, and implementations of wireless mesh networks and wireless mesh network devices are described.
1. A wireless mesh network comprising
a mesh network controller connected to a core network, a radio node linked to the controller, a first mesh node wirelessly linked to the radio node, and a second mesh node wirelessly linked to the first mesh node,
the controller, the radio node and the mesh nodes comprising processors and storage for instructions executable by the processors to establish:
airlink protocol layers executed by a user device and by the mesh network for communication on a wireless access link, the airlink protocol layers being processed partially in the second mesh node and partially in the controller,
the airlink protocol layers partially processed by the second mesh node include the physical layer and the medium access control layer, and
the airlink protocol layers partially processed by the controller include the packet data convergence protocol,
tunneling facilities to carry partially processed data of the user device in user data tunnel packets between the controller and the second mesh node,
routing facilities in the first mesh node to route the user data tunnel packets to the second mesh node.
2. The wireless mesh network of claim 1 , in which the tunneling facilities between the second mesh node and the controller use the GTP/UDP/IP protocol and a tunnel endpoint identifier in the user data tunnel packet header identifies the user device.
3. The wireless mesh network of claim 2 , in which sequence numbers are used by the mesh network to control the flow of user data tunnel packets sent by the controller to the second mesh node.
4. The wireless mesh network of claim 2 , in which ciphering is applied on user data payload only in the user device and in the controller.
5. The wireless mesh network of claim 4 , in which ciphering is applied on a user data tunnel packet header only in the second mesh node and in the controller.
6. The wireless mesh network of claim 2 , in which the tunneling facilities include header compression to reduce the user data tunnel packet header overhead.
7. The wireless mesh network of claim 1 , in which the lower sublayer of the radio link control protocol of the user device is processed in the second mesh node and the upper sublayer of the radio link control protocol of the user device is processed in the controller.
8. The wireless mesh network of claim 7 , in which the upper sublayer of the radio link control protocol includes the automatic repeat request function and the lower sublayer of the radio link control protocol includes the packet segmentation function.
9. The wireless mesh network of claim 8 , in which the controller retransmits user data payload in the radio link control protocol based on status reports sent by the user device.
10. The wireless mesh network of claim 9 , in which the airlink protocol layers executed by the first mesh node and the radio node to carry user data tunnel packets include the physical layer, the medium access layer and the radio link control protocol, and the radio link control protocol operates in the unacknowledged mode.
11. The wireless mesh network of claim 1 , in which all wireless links operate on the same frequency channel.
12. The wireless mesh network of claim 1 , in which the routing facilities in the first mesh node route the user data tunnel packets received from the radio node to the second mesh node based on an address of the second mesh node.
13. The wireless mesh network of claim 12 , in which the address is an IP address.
14. The wireless mesh network of claim 12 , in which the address is a GTP terminal end-point identifier.
15. The wireless mesh network of claim 12 , in which the second mesh node maintains an end-to-end control link to the mesh network controller to control the operation of the mesh node as a Distributed Unit (DU).
16. The wireless mesh network of claim 15 , in which the control link is based on the 3GPP F1-AP protocol.
17. The wireless mesh network of claim 15 , in which the second mesh node maintains the end-to-end control link even when the wireless link between the second mesh node and the first mesh node is not operational.
18. The wireless mesh network of claim 15 , in which the second mesh node performs a handover to a third mesh node and the end-to-end control link between the second mesh node and the mesh network controller is maintained during the handover.
19. The wireless mesh network of claim 18 , in which the third mesh node has a wireless link to the radio node, and the radio node has routing facilities to route the user data tunnel packets to the second mesh node, and during the handover the routing of downlink packets is switched from the first mesh node to the third mesh node.