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Congestion control in a telecommunications network

專利號
US10785677B2
公開日期
2020-09-22
申請人
Telefonaktiebolaget LM Ericsson (publ)(SE Stockholm)
發(fā)明人
Annikki Welin; Mats Forsman; Tomas Thyni
IPC分類
H04W28/02; H04L12/851; H04L12/801; H04L12/825; H04L12/835; H04W28/14; H04W80/08
技術(shù)領(lǐng)域
congestion,buffer,node,network,pdcp,message,in,fid,may,flow
地域: Stockholm

摘要

Congestion control in a telecommunications network, in which a method of congestion control in a transport network is provided. A buffer state of a buffer is monitored by dynamically sampling the buffer such that the sampling rate is adjusted in dependence of the buffer state. Also, a condition indicative of congestion is determined in response to a change of the buffer state exceeding a predetermined limit. In response to determining the condition indicative of congestion, a congestion notification message is created. The created congestion notification message may then be transmitted to a second network node. The second network node may subsequently compensate for a detected congestion on the basis of a received congestion notification message.

說明書

For example, the congestion may occur between BBUs and PPUs. One potential challenge might become the many acknowledgement (ACK) and non-acknowledgement (NACK) messages that are communicated over the midhaul between the BBUs and PPUs. The present disclosure recognizes the fact that, in today's Long Term Evolution (LTE) evolved NodeB (eNB) deployment, the Radio Link Control (RLC) and Packet Data Convergence Protocol (PDCP) are co-located and any ACK and/or NACK signaling between the protocol layers is typically very fast. However, the split of the RLC into the BBU and the PDCP into the PPU in the 5G RAN architecture will most likely introduce latency. At the same time the new transport network (i.e., the midhaul) between the BBU and PPU may introduce uncontrolled characteristics, like latency capacity and packet dropping.

It is in view of the above considerations and others that the various embodiments disclosed herein have been made.

As will be appreciated, some existing solutions for congestion control may be inadequate, especially in the next generations (e.g., 5G or beyond) of telecommunication networks. This disclosure recognizes that there is a need for a solution that allows for improved congestion control.

Accordingly, it is a general object of the embodiments of the present invention to allow for improved congestion control. It would be advantageous if the risk for congestion is limited, e.g. reduced or minimized. It would be particularly advantageous to provide embodiments that allow for a suitable congestion control in a fifth or future generation telecommunications network. Furthermore, it would be advantageous if the solution is backwards compatible with earlier generation telecommunications networks, such as Long Term Evolution (LTE) or LTE Advanced.

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