Adaptive delay-aware energy-saving method for optical-wireless hybrid broadband access network

Abstract

The invention discloses a self-adaptive delay-sensing energy-saving method applied to the optical wireless mixed broadband access network. In the prior art, dormancy of an optical network unit can effectively improve the energy efficiency of the optical wireless mixed broadband access network, however, the energy efficiency of a continuous dormant gateway is not high, and delay of a system data packet may be aggravated. Thus, in the downlink direction of the optical wireless mixed broadband access network, the optical network unit can select the growth speed of the dormancy period adaptively according to the arrival rate of the data packet, thereby fully utilizing the delay tolerance of the data packet; and in the uplink direction, a wireless net-shaped network of multiple gateway balance loads can reduce delay and congestion caused of path reconstruction caused by dormancy of optical network unit, thereby reducing delay in the network. The method can enable the energy efficiency of the network to be maximal while satisfying delay of the data packet.

Description

technical field [0001] The invention relates to an energy-saving mechanism technology of an optical wireless hybrid broadband access network, in particular to an energy-saving mechanism method with delay tolerance control. Background technique [0002] Different from the traditional digital subscriber line (Digital Subscriber Line, xDSL), cable modem (Cable Modem, CM), wireless cellular network, fiber to the home (Fiber To The Home, FTTH), wireless mesh network (Wireless Mesh Network, WMN ) and other access technologies, Hybrid Optical-Wireless Broadband Access Networks (HOWBAN) combines the high bandwidth, low loss, long distance, and high reliability characteristics of Passive Optical Network (PON) And the flexible and economic characteristics of WMN have attracted extensive attention from researchers at home and abroad. It starts from the optical line terminal (Optical Line Terminal, OLT) at the central office and ends at the PON part of the optical network unit (Optical ...

AI Technical Summary

Problems solved by technology

[0005] The gateway dormancy mechanism proposed in the above literature fails to reduce the exchange of messages between the OLT and the gateway during the continuous dormancy interval. When the continuous dormancy of the gateway occurs with a certain probability, the exchange of messages during the dormancy interval will consume a lot of energy. leading to a decrease in energy efficiency

Moreover, the dormant gateway will cause the Mesh node (Mesh Point, MP) to reselect the path, increasing the overhead of WMN and the delay of data packets

Burst traffic in WMN will cause some gateways to be congested, and gateway dormancy will make gateway congestion worse

[0006] In general, the current optical wireless hybrid broadband access network has the following problems to be solved in terms of energy-saving mechanisms: the traffic in the HOWBAN has a strong regularity, and the gateway will be in a long time without traffic for a certain period of time. Idle, for example, working days in residential areas or rest days in commercial areas will cause a large number of gateways to be idle; in addition, the time when users access the network is random, and the distribution of traffic is also random, and some gateways will be idle with a certain probability. The idle state occurs within a given period of time. For example, the gateway corresponding to the MP with a small number of users in the WMN will be idle for a period of time; since the MPCP in the PON stipulates that the maximum sleep cycle cannot exceed 50ms, the above two In all scenarios, the idle time of the gateway will be greater than 50ms, and the continuous sleep of the gateway will occur with a certain probability.

A continuously sleeping gateway needs to wake up and exchange messages with the OLT at the beginning of each sleep, reducing energy efficiency

A dormant gateway will cause the MP to re-route, increasing the overhead of the WMN and the delay of the data packet

At the same time, the user distribution in WMN is uneven, and the traffic distribution is also uneven. Burst traffic will also cause some gateway congestion, and gateway dormancy will make gateway congestion worse.

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