Relaying in a wireless communication network
The present disclosure relates to a first type node (AP 3 ) in a wireless communication system ( 1 ), wherein the first type node (AP 3 ) is adapted to: —communicate with at least one other first type node (AP 2 ) in the wireless communication system ( 1 ) over a corresponding backhaul channel (H 32 ) by means of one of at least one type of signal relaying that employs decoding and encoding, and —communicate with a corresponding group of second type nodes (U 31 , U 32 ) via a corresponding access channel (h 31 , h 32 ), each group of second type nodes (U 31 , U 32 ) comprising at least one second type node (U 31 , U 32 ). In the case of a backhaul channel (H′ 32 ) between the first type node (AP 3 ) and one other first type node (AP 2 ) being determined to be blocked to a certain degree, the first type node (AP 3 ) is further adapted to instruct at least one second type node (U 31 ) of the second type nodes in the group of second type nodes (U 31 , U 32 ) that is comprised in an over-heard sub-group, to communicate directly with an overhearing first type node (AP 1 ) via a corresponding access channel (h 31-1 ).
1. A first type node in a wireless communication system, wherein the first type node is adapted to:
communicate with at least one other first type node in the wireless communication system over a corresponding backhaul channel by means-way of one of at least one type of signal relaying that employs decoding and encoding, and communicate with a corresponding group of second type nodes via a corresponding access channel, each group of second type nodes comprising at least one second type node;
where, in the case of a backhaul channel between the first type node and one other first type node being determined to be blocked to a certain degree, the first type node is further adapted to: instruct at least one second type node of the second type nodes in the group of second type nodes that is comprised in an over-heard sub-group, to communicate directly with an overhearing first type node via a corresponding access channel;
wherein the first type node is adapted to instruct the second type node further to: encode a signal to be transmitted directly to the overhearing first type node at an adapted transmission rate by way of two or more sub-signals, and provide a wider antenna beam towards the overhearing first type node.
2. The first type node according to claim 1 , wherein the overhearing first type node is separate from the first type node and the other first type node, and where an additional spectral resource becomes available for communication between the first type node and the other first type node when the at least one second type node of the second type nodes in the group of second type nodes that is comprised in an over-heard sub-group, communicates directly with the overhearing first type node via the corresponding access channel.
3. The first type node according to claim 1 , wherein the first type node is adapted to form an encoded signal corresponding to a signal received from at least one other second type node of the second type nodes in the group of second type nodes that is comprised in an isolated sub-group, and to forward the encoded signal to the other first type node by being adapted to:
encode the signal at an adapted transmission rate by way of two or more sub-signals and/or
provide a wider antenna beam towards the other first type node, and/or
provide an increased transmission power.
4. The first type node according to claim 3 , wherein the first type node is adapted to inform the other first type node about the forwarded encoded signal, enabling the other first type node to decode each received signal having an adapted transmission rate comprising two or more sub-signals when all sub-signals of the signal have been received and buffered, and enabling the other first type node to re-encode said signal for a nominal transmission rate, or at least for a data rate that is adapted to the free spectrum determined to be presently available, before forwarding the re-encoded signal to a further first type node.
5. The first type node according to claim 1 , wherein, after a predetermined time, the first type node is adapted to check whether the backhaul channel between the first type node and the other first type node is determined to be blocked to said certain degree based on determined link signal-to-noise ratio, SNR, between the first type node and the other first type node and/or whether the first type node receives acknowledgement/negative acknowledgement, (ACK/NACK), feedback to a certain degree from the other first type node.
6. The first type node according to claim 1 , wherein the first type node is adapted for access communication with two or more other first type nodes, where the communication between all the first type nodes is a backhaul communication via corresponding backhaul channels, and where the backhaul communication and the access communication both are performed by way of a common equipment at the first type nodes.
7. The first type node according to claim 1 , wherein the first type node comprises a processor unit that, in the case of the backhaul channel between the first type node and one other first type node being determined to be blocked to a certain degree, is adapted to:
instruct at least one second type node of the second type nodes in the group of second type nodes that is comprised in an over-heard sub-group, to communicate directly with the overhearing first type node via a corresponding access channel.
8. A method in a first type node in a wireless communication system, the method comprising:
communicating with at least one other first type node in the wireless communication system over a corresponding backhaul channel using one of at least one type of signal relaying that employs decoding and encoding; and
communicating with a corresponding group of second type nodes via a corresponding access channel, each group of second type nodes comprising at least one second type node;
where, in the case of a backhaul channel between the first type node and one other first type node being determined to be blocked to a certain degree, the method comprises: instructing at least one second type node of the second type nodes in the group of second type nodes that is comprised in an over-heard sub-group, to communicate directly with an overhearing first type node via a corresponding access channel;
wherein the method further comprises: instructing the second type node to encode the signal to be transmitted directly to the other overhearing type node at an adapted transmission rate by way of two or more sub-signals, and instructing the second type node to provide a wider antenna beam towards the overhearing first type node.
9. The method according to claim 8 , wherein the overhearing first type node is separate from the first type node and the other first type node, and where an additional spectral resource becomes available for communication between the first type node and the other first type node when the at least one second type node of the second type nodes in the group of second type nodes that is comprised in an over-heard sub-group, communicates directly with the overhearing first type node via the corresponding access channel.
10. The method according to claim 8 , wherein the method comprises:
encoding a signal from at least one other second type node of the second type nodes in the group of second type nodes that is comprised in an isolated sub-group, and
forwarding said signal to the other first type node by:
encoding the signal at an adapted transmission rate by way of two or more sub-signals, and/or
providing a wider antenna beam towards the other first type node, and/or providing an increased transmission power.
11. The method according to claim 8 , wherein, after a predetermined time, the method comprises checking whether the backhaul channel between the first type node and the other first type node is determined to be blocked to said certain degree based on determined link signal-to-noise ratio, (SNR), between the first type node and the other first type node and/or whether the first type node receives acknowledgement/negative acknowledgement, (ACK/NACK), feedback to a certain degree from the other first type node.
12. The method according to claim 8 , wherein the method comprises informing at least one the overhearing first type node and the other first type node, about changes, enabling said first type node to decode each received signal having an adapted transmission rate comprising two or more sub-signals when all sub-signals of the signal have been received and buffered, and to re-encode said signal for a nominal transmission rate, or at least for a data rate that is adapted to the free spectrum determined to be presently available, before forwarding the re-encoded signal to a further first type node.