CN101505288B - Relay apparatus for wide band narrow band bi-directional communication - Google Patents

Abstract

The invention discloses a wideband and narrowband two-way communication relay device, which provides operators with a hybrid access mode combining wideband and narrowband. The technical solution is: a device, including: a signal input port, receiving an external mixed signal; a gateway module, which demodulates the data signal, and outputs an IP signal; a narrowband processing module, which digitally modulates the Ethernet data signal to the first radio frequency band for Narrowband signal transmission; broadband processing module, which digitally modulates the Ethernet data signal to the second radio frequency band, and mixes it with the TV signal to realize the co-cable transmission of the broadcast interactive signal on the coaxial cable. Otherwise, it receives the separated modulated digital signal and passes The demodulation is converted into an Ethernet data signal; the frequency mixing module modulates the output of the broadband processing module and the narrowband processing module to different frequency bands for transmission on the same coaxial cable by means of frequency division multiplexing; the signal output port connects The output of the mixer module is routed to the coaxial cable. The invention is applied in the field of digital television.

Description

A broadband and narrowband two-way communication relay device

technical field

The present invention relates to a two-way communication relay device, in particular to a two-way communication relay device which can simultaneously meet the access requirements of broadband terminals and narrowband terminals.

Background technique

SARFT’s guidelines for two-way transformation of wired networks recommend standards including DOCSIS, MOCA, EOC, BIOC, etc. Among them, BIOC (Broadcasting and Interactivity Over Cable, broadcast interactive coaxial network user access technology) is a two-way access solution for the last mile after the optical node of the HFC network. It fully utilizes the original distribution network resources to carry broadcast and TV signals. (analog/digital television) and data signals.

For the narrowband board shown in Figure 1, DOC (DOC is a narrowband communication system based on cable TV Cable) technology is used, and its principle is divided into two parts: modulation/demodulation of MSK modulation of baseband data signals, TV signal Mix/separate with data modulation preferences. For the broadband board as shown in Figure 2, the BIOC technical framework is adopted, and its principle is divided into two parts: modulation/demodulation of baseband data signal OFDM and QAM modulation, mixing/separation of TV signal and data modulation signal. However, among the existing relay devices, there is no such relay device that can satisfy the access of broadband terminals and narrowband terminals at the same time.

Contents of the invention

The purpose of the present invention is to solve the above problems. It provides a broadband and narrowband two-way communication relay device, which is designed according to the user's requirements for full access, and uses the same relay device to meet the access of broadband terminals and narrowband terminals at the same time. The trunk is flexibly equipped with broadband and narrowband modules to realize rapid coverage of two-way network transformation according to the needs of the network and the business development of operators.

The technical solution of the present invention is: the present invention discloses a broadband and narrowband two-way communication relay device, comprising:

The signal input port receives the mixed signal of cable TV signal and data service signal on the external coaxial cable;

The gateway module receives the mixed signal from the signal input port, demodulates the input modulated data signal, and outputs the demodulated Ethernet data signal to the narrowband processing module and the broadband processing module respectively;

The narrowband processing module, based on the narrowband communication system technology of cable television, digitally modulates the Ethernet data signal to the first radio frequency band to transmit the narrowband signal;

The broadband processing module, based on the broadcast interactive coaxial network user access technology, digitally modulates the Ethernet data signal to the second radio frequency band, and mixes it with the TV signal to realize the co-cable transmission of the broadcast interactive signal on the coaxial cable. Receive separated modulated digital signals and convert them into Ethernet data signals through demodulation;

The frequency mixing module modulates the output of the broadband processing module and the output of the narrowband processing module to different frequency bands by means of frequency division multiplexing so as to transmit on the same coaxial cable;

The signal output port transmits the output of the mixing module to an external coaxial cable.

In the above broadband and narrowband two-way communication relay device, the digital modulation in the narrowband processing module is MSK modulation, and the output is a radio frequency signal based on MSK modulation.

In the above broadband and narrowband two-way communication relay device, the first radio frequency band in the narrowband processing module is a 900MHz frequency band.

In the above broadband and narrowband two-way communication relay device, the digital modulation in the broadband processing module is OFDM and QAM modulation, and its output is a radio frequency signal based on OFDM and QAM modulation.

In the above broadband and narrowband two-way communication relay device, wherein the second radio frequency band in the broadband processing module is a frequency band of 950-1050 MHz.

The above-mentioned broadband and narrowband two-way communication relay device, wherein, the communication protocol of the device is the fusion of standard Ethernet protocol and private protocol at the equipment side, providing standard Ethernet protocol for upper-level equipment, and implementing private protocol and standard Ethernet protocol for lower-level equipment total tolerance.

Compared with the prior art, the present invention has the following beneficial effects: the two-way communication relay device of the present invention implements broadband and narrowband user terminals and service types through an HFC network through frequency division multiplexing, and provides operators with broadband and narrowband integration The hybrid access method provides maximum flexibility for bidirectional network transformation. After using this two-way communication relay device, the wide-narrow integrated terminal only needs to be covered once, and it can support various types of terminals, so that operators have greater flexibility in business development, and can quickly develop broadband and For narrowband interactive services, users can choose different terminal devices without additional coverage costs.

Description of drawings

Figure 1 is a functional block diagram of a narrowband board.

Figure 2 is a functional block diagram of the broadband board.

Fig. 3 is a hardware schematic diagram of an embodiment of the broadband and narrowband two-way communication relay device of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 3 shows the hardware principle of the broadband and narrowband two-way communication relay device of the present invention. Please refer to FIG. 3 , the embodiment of the broadband and narrowband bidirectional communication relay device 1 of the present invention includes a signal input port 10 , a gateway module 11 , a narrowband processing module 12 , a broadband processing module 13 , a mixing module 14 and a signal output port 15 .

The signal input port 10 receives a mixed signal of a cable television signal and a data service signal transmitted on an external coaxial cable. The gateway module 11 receives the mixed signal from the signal input port 10 , demodulates the input modulated data signal, and outputs the demodulated IP signal to the narrowband processing module 12 and the broadband processing module 13 respectively.

The narrowband processing module 12 digitally modulates the Ethernet data signal to the 900MHz radio frequency band through MSK modulation based on DOC technology, and transmits the narrowband signal, and its output is a radio frequency signal based on MSK modulation. The broadband processing module 13 digitally modulates the Ethernet data signal to the 950-1050MHz radio frequency band through QAM and OFDM modulation based on BIOC technology, and mixes it with the TV signal to realize the co-cable transmission of the broadcast interactive signal on the coaxial cable; otherwise, it receives the separated modulation A digital signal is converted into an Ethernet data signal through demodulation. The output of the broadband processing module 13 is a radio frequency signal based on OFDM and QAM modulation. The frequency mixing module 14 modulates the output data of the broadband processing module 13 and the narrowband processing module 12 to different frequency bands by means of frequency division multiplexing for transmission on the same coaxial cable. The signal output port 15 transmits the output of the mixing module 14 to an external coaxial cable.

Due to the limited performance of the local end of the narrowband processing module, data packets need to be filtered on the upstream broadband processing module to avoid useless data packets from consuming the resources of the narrowband processing module: the narrowband local end can be configured in an independent VLAN (virtual local area network) In order to avoid the impact of other services on the performance of the narrowband communication system, the broadband processing module filters out non-ARP (Address Resolution Protocol) broadcast packets.

The broadband and narrowband two-way communication relay device of the present invention realizes the integration of the standard IP protocol and the private protocol at the equipment end, is the inheritance and development of the BIOC relay equipment, provides the standard IP protocol for the upper side, and realizes the private protocol and standard IP for the lower side The compatibility of the protocol greatly improves the uniformity and network manageability of the equipment.

The above-mentioned embodiments are provided for those of ordinary skill in the art to implement or use the present invention. Those of ordinary skill in the art can make various modifications or changes to the above-mentioned embodiments without departing from the inventive idea of the present invention. Therefore, the present invention The scope of protection of the invention is not limited by the above-mentioned embodiments, but should be the maximum scope consistent with the innovative features mentioned in the claims.

Claims (6)

1. relay apparatus for wide band narrow band bi-directional comprises:

Signal input port, the cable TV signal on the reception outer, coaxial cable and the mixed signal of data service signal;

Gateway module receives the mixed signal from signal input port, and the data-signal after the modulation of input is carried out demodulation, exports respectively the ether data-signal after the demodulation to Narrow-band processing module and broadband processing module;

The Narrow-band processing module, based on the narrow-band communication system technology of cable TV with the ether data-signal through Digital Modulation to the first radio frequency band, carry out the transmission of narrow band signal;

The broadband processing module, based on broadcast interaction coaxial network user access technology with the ether data-signal through Digital Modulation to the second radio frequency band, mix the rear co-cable transmission of broadcast interaction signal on coaxial cable that realize with TV signal, receive the modulated digital signal of separating from frequency mixing module, be converted to the ether data-signal by demodulation;

Frequency mixing module, the mode by frequency division multiplexing is modulated to different frequency bands in order to transmit at same coaxial cable with the output of this broadband processing module and the output of this Narrow-band processing module;

Signal output port is transferred to the output of this frequency mixing module on the outside coaxial cable.

2. relay apparatus for wide band narrow band bi-directional according to claim 1 is characterized in that, the Digital Modulation in this Narrow-band processing module is minimum shift keying MSK modulation system, and it is output as the radiofrequency signal based on minimum shift keying MSK modulation.

3. relay apparatus for wide band narrow band bi-directional according to claim 2 is characterized in that, this first radio frequency band in this Narrow-band processing module is the 900MHz frequency range.

4. relay apparatus for wide band narrow band bi-directional according to claim 1, it is characterized in that, Digital Modulation in this broadband processing module is orthogonal frequency division multiplex OFDM and quadrature amplitude modulation qam mode, and it is output as the radiofrequency signal based on orthogonal frequency division multiplex OFDM and quadrature amplitude modulation QAM modulation.

5. relay apparatus for wide band narrow band bi-directional according to claim 4 is characterized in that, this second radio frequency band in this broadband processing module is 950～1050MHz frequency range.

6. relay apparatus for wide band narrow band bi-directional according to claim 1, it is characterized in that, the communication protocol of this device is that standard ethernet protocol and proprietary protocol are in the fusion of equipment end, provide standard ethernet protocol to higher level equipment, subordinate equipment is realized the common appearance of proprietary protocol and standard ethernet protocol.

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