Handling of re-transmissions in a wireless communication network

Patent metadata

Field	Value
Publication number	US-12375207-B2
Application number	US-201917774682-A
Country	US
Kind code	B2
Filing date	Nov 6, 2019
Priority date	Nov 6, 2019
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

The present disclosure relates to a node (AP2, U11) in a wireless communication system (1), where the node (AP2, U11) is adapted to communicate with at least two other nodes (AP1, AP0) in the wireless communication system (1), and where the other nodes (AP1, AP0) are first type nodes (AP1, AP0) which are adapted to communicate with each other by means of backhaul communication. The node (AP2, U11) is adapted to receive a signal (xA) transmitted from an adjacent first type node (AP1), where the (xA) has been forwarded from at least one farther first type node (AP0). In case of unsuccessful decoding of the signal (xA), the node (AP2, U11) is adapted to request re-transmission (NACK) of the signal (xA), and to receive a re-transmission of the signal (xA) directly from a farther first type node (AP0).

First claim

The invention claimed is:

1. A first node in a wireless communication system the first node being configured to:
receive a signal transmitted from a second node via a first channel between the second node and a third node and a second channel between the third node and the first node, wherein
the second node is configured to provide wireless access to a group of one or more devices,
the third node is configured to provide wireless access to a group of one or more devices,
the first channel is a backhaul channel, and
in case of unsuccessful decoding of the signal at the first node, the first node is adapted to:
request re-transmission of the signal; and
based on requesting the re-transmission of the signal, receive the signal directly from the second node via a third channel between the second node and the first node,

and wherein the first node is configured to:
provide wireless access to a group of one or more devices, the second channel between the third node and the first node is a backhaul channel, and the third channel between the second node and the first node is a backhaul channel;
receive another signal from the second node via the first channel between the second node and the third node and the second channel between the third node and the first node, forward to the received said another signal to a fourth node configured to provide wireless access to a group of devices via a fourth channel, and the fourth channel is a backhaul channel; and
determine that a signal-to-noise ratio (SNR) of the signal is less than a threshold value;
based on determining that the SNR of the signal is less than the threshold value, determine that the first node cannot decode the signal successfully;
determine that a combined SNR of the signal received via the first and second channels and the signal received via the third channel is greater than the threshold value; and
based on determining that the combined SNR of the signal is greater than the threshold value, determine that the first node can decode the signal successfully.

2. The first node according to claim 1 , wherein the first node is adapted to request the re-transmission of the signal directly to the second node.

3. The first node according to claim 1 , wherein the second node is connected to a core network by means of a fiber connection.

4. The first node according to claim 1 , wherein the re-transmission of the signal is performed in temporarily inactive time periods where the first node and the second node are not engaged in any communication with other nodes.

5. The first node according to claim 1 , wherein the request for the re-transmission of the signal is based on Hybrid Automatic Repeat Request, HARQ.

6. A method performed by a first node in a wireless communication system, the method comprising:
receiving a signal transmitted from a second node via a first channel between the second node and a third node and a second channel between the third node and the first node wherein;
the second node is configured to provide wireless access to a group of one or more devices,
the third node is configured to provide wireless access to a group of one or more devices,
the first channel is a backhaul channel, and
the method comprises, in case of unsuccessful decoding of the signal at the first node,
requesting re-transmission of the signal; and
based on requesting the re-transmission of the signal, receiving the re-transmission of the signal directly from the second node via a third channel between the second node and the first node,

wherein the first node is configured to provide wireless access to a group of one or more devices, the second channel between the third node and the first node is a backhaul channel, and the third channel between the second node and the first node is a backhaul channel;
receiving another signal from the second node via the first channel between the second node and the third node and the second channel between the third node and the first node;
forwarding to the received said another signal to a fourth node configured to provide wireless access to a group of devices via a fourth channel, and the fourth channel is a backhaul channel;
determining that a signal-to-noise ratio (SNR) of the signal is less than a threshold value;
based on determining that the SNR of the signal is less than the threshold value, determining that the first node cannot decode the signal successfully;
determining that a combined SNR of the signal received via the first and second channels and the signal received via the third channel is greater than the threshold value; and
based on determining that the combined SNR of the signal is greater than the threshold value, determining that the first node can decode the signal successfully.

7. The method according to claim 6 , wherein the method comprises requesting the re-transmission of the signal directly to the second node.

8. The method according to claim 6 , wherein the second node is connected to a core network by means of a fiber connection.

9. The method according to claim 6 , wherein the re-transmission of the signal is performed in temporarily inactive time periods where the first node and the second node are not used for communication with other nodes.

10. The method according to claim 6 , wherein the request for the re-transmission of the signal is based on Hybrid Automatic Repeat Request, HARQ.

11. A wireless communication system comprising:
a first access point for providing wireless access to a first group of one or more devices;
a second access point for providing wireless access to a second group of one or more devices;
a third access point for providing wireless access to a third group of one or more devices; and
a fourth access point for providing wireless access to a fourth group of one or more devices, wherein
the first access point is configured to transmit a first signal to the second access point via a first backhaul channel between the first and second access points,
the second access point is configured to receive the first signal from the first access point via the first backhaul channel and transmit the received first signal to the third access point via a second backhaul channel between the second and third access points,
the third access point is configured to receive the first signal from the second access point via the second backhaul channel and transmit the received first signal to the fourth access point via a third backhaul channel between the third and fourth access points,
the first access point is configured to retain a second signal in the first access point's buffer memory and transmit the second signal to the second access point via the first backhaul channel between the first and second access points,
the second access point is configured to receive the second signal from the first access point via the first backhaul channel, transmit the received first signal to the third access point via the second backhaul channel between the second and third access points, and delete the second signal from the second access point's buffer memory, and
the third access point is configured to:
receive the second signal from the second access point via the second backhaul channel between the second and third access points;
determine that a signal-to-noise ratio (SNR) of the second signal is less than a threshold value;
determine that the third access point cannot decode the second signal based on determining that the SNR of the second signal is less than the threshold value;
based on determining that the third access point cannot decode the second signal, transmit a request for re-transmission of the second signal to the first access p

Assignees

• Ericsson Telefon Ab L M

Inventors

• Makki Behrooz
• Coldrey Mikael

Classifications

• H04L2001/0097

  Relays · CPC title

• H04W84/12

  WLAN [Wireless Local Area Networks] · CPC title

• H04W92/20

  between access points · CPC title

• H04W88/10

  adapted for operation in multiple networks, e.g. multi-mode access points · CPC title

• H04L1/08 Primary

  by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} · CPC title