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Methods and apparatuses for maintaining synchronization between a radio equipment controller and an item of radio equipment

A technology of radio equipment and controllers, which is applied in wireless communication, electrical components, multiplex communication, etc., and can solve the problems that the basic Ethernet protocol is not guaranteed, accurate, and deterministic timing is not acceptable, not deterministic, etc.

Active Publication Date: 2014-08-20
VIVO MOBILE COMM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, due to the asynchronous nature of the Ethernet protocol, packets on an Ethernet link experience variable queuing delays at each switching node along the routing path
Furthermore, the basic Ethernet protocol does not guarantee that packets will be delivered in order or even at all - although there are protocol mechanisms available for retransmitting dropped packets
Therefore, the transmission link delay of a typical asynchronous communication link is variable rather than deterministic, which is not acceptable for the accurate, deterministic timing required for CPRI-based synchronization between RECs and REs

Method used

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  • Methods and apparatuses for maintaining synchronization between a radio equipment controller and an item of radio equipment
  • Methods and apparatuses for maintaining synchronization between a radio equipment controller and an item of radio equipment
  • Methods and apparatuses for maintaining synchronization between a radio equipment controller and an item of radio equipment

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Embodiment Construction

[0043] figure 1 A wireless communication network 10 is shown at least in part, eg a WCDMA or LTE based cellular communication network. A radio equipment controller (REC) 12 sends downlink (DL) data 14 for transmission by a radio equipment (RE) item 16 to one or more user equipment 18 . The term "user equipment" broadly refers to essentially any type of wireless communication device, including but not limited to cellular phones (smart phones and future phones), pagers, modems and network adapters, wirelessly linked computers, tablets, and the like. For ease of reference, "User Equipment" is abbreviated as "UE" in the singular and "UEs" in the plural. The RE 16 also receives uplink (UL) data 20 from the UE 18 and sends that data to the REC 12 .

[0044] The "whole" communication link 22 between REC 12 and RE 16 provides for the transfer of DL 14 from REC 12 to RE 16 and the transfer of UL data 20 from RE 16 to REC 12 . As shown, the overall link 22 includes a common public ra...

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Abstract

The present invention comprises methods and apparatuses for maintaining radio network timing synchronization across an asynchronous communication link (26) between a Radio Equipment Controller (REC) (12) and an item of Radio Equipment (RE) (14). An REC- side adaptor (30) sends first and second asynchronous packet flows over the asynchronous communication link (26), including a downlink packet flow comprising CPRI basic frames (34) and overhead information encapsulated in asynchronous communication link packets, and a synchronization packet flow comprising CPRI clock data. A RE-side adaptor (32) recovers the CPRI clock from the synchronization packet flow, and uses the recovered clock to re- synchronize the downlink data (14) recovered from the downlink packet flow. For the uplink, the RE (16) outputs uplink traffic in a synchronous, CPRI-compliant stream that is then encapsulated for asynchronous transport by the RE-side adaptor (32). The REC-side adaptor (30) reconstitutes the asynchronously received uplink data as a synchronous, CPRI-compliant stream for input to the REC (12).

Description

technical field [0001] In general, the present invention relates to and maintaining data synchronization between radio equipment items and their corresponding radio equipment controllers. Background technique [0002] Dividing the Base Transceiver (BTS) equipment into a Radio Equipment (RE) part and a Radio Equipment Controller (REC) part allows for a physical separation between the RE and the REC. Separation has certain advantages, for example, it allows one REC to control multiple distributed REs. Here, "RE" should be understood broadly to include base station repeater transceiver nodes. [0003] The RE is connected to the antenna via an analog RF feed line, which forms the BTS signaling air interface. The fidelity of the signal transmitted and received via the antenna is degraded by feeder loss, and it is therefore advantageous to place the RE close to the antenna. Typically, there are many REs assigned to a REC. This arrangement allows signal processing resources in ...

Claims

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Application Information

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IPC IPC(8): H04W88/08H04J3/06
CPCH04W88/085H04J3/0667H04J3/0632
Inventor G.欧文
Owner VIVO MOBILE COMM CO LTD
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