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Method and apparatus for determining synchronisation references

A technology for synchronizing paths and reference nodes, which can be used in synchronization devices, multiplexing communications, time-division multiplexing systems, etc., to solve problems such as unpredictable delays and delay variations

Active Publication Date: 2018-03-27
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These differences in physical transport and different types of topologies create unpredictable delays and delay variations

Method used

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  • Method and apparatus for determining synchronisation references
  • Method and apparatus for determining synchronisation references
  • Method and apparatus for determining synchronisation references

Examples

Experimental program
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Embodiment Construction

[0027] There is a need for a solution that improves control and propriety when providing synchronization references in communication networks.

[0028] A coordinator is a communication network node configured to determine and select an appropriate combination of synchronization references and establishment of synchronization paths for requests from access nodes (eg radio base stations). For the radio base stations that will use the radio coordination scheme, the coordinator will determine and select an appropriate synchronization reference to minimize the phase deviation between the radio base stations. Radio base stations may have to be time or phase synchronized for different reasons (eg for positioning). The coordinator determines the backhaul domain for the transport network nodes and one or more access domains for the access nodes. When requesting a synchronization reference from an access node, the coordinator determines multiple combinations of synchronization referenc...

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Abstract

A backhaul domain of the communication network is determined 400, and a request for a synchronisation reference is received 402 from the first access node, the request comprising, ID:s of the first and second access nodes. For each one of the first and second access nodes, a first and a second combination are determined 404 of a first and a second respective synchronisation reference and related synchronisation paths extending between synchronisation reference nodes of the synchronisation references and the access nodes. For each one of the first and second access nodes, the first or the second combination of synchronisation reference and related synchronisation path is selected 406 based on synchronisation requirements for the first and second access nodes, and the first path or the second path is requested to be set-up 408 according to the selected 406 combination. By providing functionality which works on the top of existing control of radio and transport domains, appropriate synchronisation references may be determined with a limited amount of information exchanged between the respective domains.

Description

technical field [0001] This description generally relates to time or phase synchronization in communication networks. Specifically involves determining the appropriate synchronization reference. Background technique [0002] In communication networks applying LTE (Long Term Evolution) based radio access technologies, accurate time and phase alignment of internal clocks is important. LTE-TDD (Time Division Duplex) Numerous LTE-FDD (Frequency Division Duplex) coordination features require time and phase synchronization, e.g. for joint transmissions where a wireless communication device receives from multiple cells or multiple RBSs (Radio Base Stations) data, which provides better performance but places higher demands on synchronization. A major problem with synchronization protocols in packet-synchronous networks is the difference in send time, access time, propagation time, and receive time. [0003] From an infrastructure perspective, mobile operators have a wide range of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00
CPCH04J3/0641H04J3/0667H04W56/0015H04W72/0446
Inventor 斯特凡诺·鲁菲尼葆拉·约万纳马茨·福斯曼托马斯·蒂尼
Owner TELEFON AB LM ERICSSON (PUBL)
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