Bandwidth adjusting method and communication node

A communication node, comprising:

• an upstream ingress unit and at least two downstream branch egress units, wherein
• the upstream ingress unit is configured to send a group of multi-channel parallel basic switch cells to the at least two downstream branch egress units, wherein first adjustment signaling is carried in the group of multi-channel parallel basic switch cells and is used for indicating unidirectional addition or removal of a respective basic switch cell;
• perform polling detection on unidirectional adjustment response statuses returned by the at least two downstream branch egress units according to a downstream branch egress unit list of the communication node;
• and send first normal signaling to the at least two downstream branch egress units when determining the unidirectional adjustment response statuses returned by the at least two downstream branch egress units are reception acknowledgement;
• wherein the unidirectional adjustment response statuses carry respective downstream branch egress unit identifiers and are used for indicating the reception of the first adjustment signaling, and wherein the downstream branch egress unit list stores a corresponding relation between an upstream ingress unit identifier and downstream branch egress unit identifiers;
• and
• each downstream branch egress unit is configured to return an unidirectional adjustment response status after receiving the group of multi-channel parallel basic switch cells carrying the first adjustment signaling;
• after receiving the first normal signaling, add or remove a respective basic switch cell into or from a next group of multi-channel parallel basic switch cells according to the first adjustment signaling;
• and adjust a time slot of a high order optical channel data unit sent to a downstream node, and instruct the downstream node to adjust the time slot of the high order optical channel data unit.