What is a 5.8 GHz Cordless Phone?

The 5.8GHz band is a higher and open ISM band than the 2.4GHz frequency. It has entered the field of product development in recent years. It complies with 802.11a, FCC Part 15, ETSI EN 301 489, ETSI EN 301 893, EN 50385, EN 60950 and other international standards, currently few mouse, drone and cordless phone use this technology, is one of the technologies that is expected to replace 2.4GHz wireless technology.

5.8ghz wireless technology

The 5.8GHz band is a higher, open frequency than the 2.4GHz frequency

5.8GHz wireless product adoption

5.8GHz wireless products provide three 100MHz U-NII (license-free

Various data show that 5.8GHz performance is indeed better than 2.4GHz

From the whole

5.8ghz national standard for wireless technology

1. The 5725-5850 MHz (5.8GHz) frequency band is used as a common frequency band for radio stations such as point-to-point or point-to-multipoint spread spectrum communication systems, high-speed wireless local area networks, broadband wireless access systems, Bluetooth technology equipment, and vehicle wireless automatic identification systems.

Technically-compliant radio communication equipment sharing the frequency with radio positioning services and non-wireless communication equipment such as industrial, scientific, and medical in the 5725-5850MHz band are all major services.

Two main technical indicators of radio communication equipment

(I) Operating frequency range: 5725-5850 MHz

(II) Transmit power: 500 mW and 27 dBm

(3) Equivalent isotropic radiated power (EIRP): 2 W and 33 dBm

(4) Maximum power spectral density: 13 dBm / MHz and 19 dBm / MHz (EIRP)

(5) Carrier frequency tolerance: 20 ppm

(6) Out-of-band transmit power (EIRP): -80 dBm / Hz (5725MHz or 5850MHz)

(Vii) Stray emission (radiation) power:

-36 dBm / 100 kHz (30 ~ 1000 MHz)

-40 dBm / 1 MHz (2400 ~ 2483.5 MHz)

-40 dBm / 1 MHz (3400 ~ 3530 MHz)

-33 dBm / 100 kHz (5725 ~ 5850 MHz) (Note: Corresponding to 2.5 times the channel bandwidth of the carrier)

-30 dBm / 1 MHz (other 1 ~ 40 GHz)

3. The radio frequency part of the radio transmitting equipment in this frequency band and its antenna must be designed and produced in accordance with the integration, and its external adjustment or control device is only used for adjustment or control within the technical specifications approved by the model. When setting up and using, you must not use other antennas or add additional RF power amplifiers without authorization.

4. The frequency occupation fee of radio stations in the 5.8GHz band shall be implemented in accordance with the frequency occupation fee standard stipulated in the Notice on Trial Charge Standards for Issuing Radio Occupation Fees for New Radio Services (No. [2001] No. 226). Yuan / MHz / base station, charge according to the approved bandwidth, less than 1MHz charge according to 1MHz.

5. The establishment of radio transmitting stations using the 5.8GHz band must be reported to the radio regulatory agencies of the province, autonomous region, and municipality directly under the Central Government for approval.

To set up a spread-spectrum communication system using a point-to-point communication method or a wireless local area network, a central station of a wireless access system, and other fixed radio stations in an outdoor environment, a radio license must be obtained.

6. Set up radio stations that use the 5.8GHz band point-to-point or point-to-multipoint spread spectrum communication system, wireless local area network, and broadband wireless access system. In principle, they are used for public network wireless access communication. Operating companies must obtain the corresponding basic telecommunications. Business license.

7. The traffic management department uses the 5.8GHz frequency band to set up special radio management radio stations such as automatic vehicle identification. It must go to the radio management agency of the province, autonomous region, or municipality where it is located to complete the station approval procedures and pay the frequency occupation fee.

8. Radio stations in this frequency band shall not cause harmful interference to legal radio positioning stations. If interference occurs, stop using it immediately and take measures to eliminate interference before continuing to use it.

Other radio stations in this frequency band are not protected from interference and should, in principle, be resolved or negotiated. To facilitate coordination and need to find the source of interference, you can ask the local radio regulatory agency for assistance in finding.

9. The radio transmitting equipment used in production, import, sales and installation must obtain the type approval certificate issued by the national radio regulatory agency.

All production, import, sales units, and enterprises must not have content similar to "No Approval" in marketing activities such as product specifications, promotional materials, and advertisements related to 5.8GHz band radio equipment.

X. The research and development of radio equipment with new technologies and services in the 5.8GHz band shall be carried out in accordance with the "Regulations on the Development of Radio Transmission Equipment".

In order to promote the effective sharing of multiple systems and technologies in the 5.725-5.85 GHz frequency band, technological innovation in each system should be actively encouraged, and efforts should be made to enhance the anti-interference ability of its own systems in a coexisting environment, and to enhance the reliability and availability of its work.

5.8ghz wireless technology features

I. Open frequency bands

The 5.8GHz frequency band is an open frequency band. Unlike the 3.5GHz or 26GHz frequency points, which need to be allocated through bidding, it is relatively easy to obtain the 5.8GHz frequency point. You only need to apply to the local authority and file it. When operators do not have other frequency bands available, it is undoubtedly an ideal choice to apply for the 5.8GHz frequency band.

Channel division and carrier bandwidth

The 5.8GHz frequency range is 125MHz from 5725MHz to 5850MHz. The national competent authority has not forcibly stipulated the channel bandwidth and allocation method of 5.8GHz equipment. Therefore, the channel division and carrier bandwidth of 5.8GHz equipment from different manufacturers are not the same. The channel ranges from 4-10, and the channel bandwidth ranges from 6MHz-35MHz. From the perspective of frequency planning and cellular networking, the more channels, the better (at least 4-6 non-overlapping), which can avoid interference well; but on the other hand, if the channel bandwidth is too small, under the same modulation mode , The service bandwidth will be relatively small. Therefore, from the comprehensive consideration of frequency planning and service bandwidth, it is necessary to be able to perform frequency planning well and have a wide service bandwidth. It is reasonable that the channel bandwidth of the 5.8GHz system ranges from 15MHz to 25MHz.

3. Modulation mode and service bandwidth

The 5.8GHz frequency band does not specify the range of the uplink and downlink channels, so most 5.8GHz systems use TDD in the air, and the uplink and downlink share one channel. Its service bandwidth index generally refers to the sum of uplink and downlink service bandwidth. 5.8GHz access system modulation methods include BPSK, QPSK, 8QAM, 16QAM, 64QAM, etc. The service bandwidth ranges from 6Mbps to 70Mbps. The choice of modulation method is mainly related to the coverage distance and link conditions. Taking the channel bandwidth as 20MHz as an example, using the QPSK modulation method, the service bandwidth can reach 18Mbps, and using the 16QAM modulation method, the service bandwidth can reach 51Mbps.

4. Propagation characteristics and coverage distance

5.8GHz is as affected by the rain rate as 3.5GHz. Under 16mm / h rainfall, the rain attenuation is 0.06dB / KM, which is 0.6dB per 10km rain attenuation, which can be basically ignored when designing the wireless link. Excluding. For a single carrier 5.8GHz system, the line-of-sight is usually required between the base station and the end station; for a 5.8GHz system using OFDM technology, the line-of-sight may not be required between the base station and the end station. The 5.8GHz point-to-multipoint system coverage can usually reach 5-10 km. The coverage distance is mainly related to the system modulation method. For example, when the QPSK method is used, the coverage distance can reach 10 kilometers, and when the 16QAM method is used, the coverage distance is 5 kilometers. For small and medium-sized cities, using 1-3 5.8GHz base stations and 4-6 sectors per base station can basically cover most of the urban area. The 5.8GHz point-to-point system uses a parabolic directional antenna, covering a maximum distance of 80 kilometers.

V. Protocol standards and QoS

5.8GHz bandwidth wireless access system uses protocols such as 802.11a and proprietary protocols. There is currently no 5.8GHz system fully developed based on the 802.16 standard. In terms of QoS, most of the 5.8GHz systems support the guarantee of the maximum limited bandwidth, minimum guaranteed bandwidth, and multi-service flow priority. The multi-service flow priority guarantees that different service flows are identified by judging the TOS field of the IP packet, and provides a higher priority level for video, VoIP and other service flows than ordinary IP services. So as to guarantee the service quality of video and VoIP services. Because most 5.8GHz broadband wireless access systems are positioned as pure IP access, and voice access is solved by VoIP, it is especially important to have multiple service flow priority guarantees.

5.8ghz wireless technology Internet cafe and telephone bar access

5.8GHz broadband wireless access system can easily achieve Internet cafes and IP phone bar access. For a sector with a service bandwidth of 50 Mbps, each Internet cafe is allocated 5 Mbps, so each sector can take 10 Internet cafes. Considering the dynamic bandwidth allocation, the actual bandwidth obtained by each Internet cafe is much greater than 5 Mbps, which fully meets the average Internet cafe Bandwidth requirements. For the IP phone, the end station side accesses the IP phone through a small voice gateway, and the central office uses a relay gateway to access the PSTN. The networking is simple and easy to implement. The voice gateway on the end station side can provide 5-50 IP phones according to actual needs. In order to ensure the high voice quality of IP phones, VoIP uses G.711 coding method. Each phone occupies 64Kbps upstream and downstream, plus overhead management and other overhead, each IP phone occupies 100Kbps bandwidth. Assuming that the IP phone has 20 IP phones, the bandwidth required for simultaneous calls is: 100 × 20 × 2 = 4Mbps. In this case, one sector can carry 12 IP phones. If you consider the traffic factor again, you can take more. There can be both IP and Internet cafes in a sector. For example, under the above premise, you can bring 5 Internet cafes and 6 IP phones.

5.8ghz wireless technology major customer integrated service access

Large customers include advanced business users, large and medium-sized enterprises, campuses, etc. They have large bandwidth requirements and more business requirements, including conference television, voice, and data. Its conference TV, voice and data requirements can be transmitted through Over IP, and the bandwidth requirements are generally 10Mbps-40Mbps. Assume that the customer has 50 VoIP phones and fax machines, 100 PCs, and a conference TV. How much bandwidth does it need? VoIP uses the G.711 coding method, and the traffic volume is 0.5Erl; the bandwidth required by telephones and fax machines is 50 × 2 × 100 × 0.5 = 5Mbps; the Internet data bandwidth is 5MbpsGHz; and the conference television bandwidth is 2Mbps. Then the bandwidth required by this big customer is 12Mbps. For a 5.8GHz access system with a service bandwidth of 50Mbps per sector, 4 such large customers can be brought. In order to ensure the service quality of key customers, in addition to the total export bandwidth of key customers, the service quality of conference TV and VoIP must also be guaranteed. For the IP Internet service, applications such as downloading and video on demand will cause a large amount of traffic for a period of time. At this time, the effects of conference TV and VoIP will be affected by the Internet service and become intermittent. The 5.8GHz system can support multiple service flow guarantees. By setting the TOS field of the conference TV service flow and the VoIP service flow, the 5.8G system will determine different service flows based on the TOS field and place the conference TV and VoIP service flows into high priority. Priority queue, priority processing. Therefore, ensure that the Internet access service does not affect the conference TV and telephone services.

5.8ghz wireless technology base station interconnection

It is very common to solve the problem of GSM, CDMA, and PCS base station interconnection through digital microwave. At present, operators will still set up a large number of base stations to solve the call problem in remote and underdeveloped areas, and these areas are lacking communication infrastructure. Base stations need 1-4 E1 transmission channels. In this case, when the capacity requirements are not large, the use of wired transmission for base station interconnection investment is too large. It is undoubtedly more reasonable to solve the E1 transmission problem through wireless access. In chain networking, point-to-point microwave transmission can be performed step by step, and the solution is simple and practical. Using a 5.8GHz point-to-point microwave system has the following advantages: 1) The frequency band is open and easy to apply. 2) Abundant capacity, 1-4 E1 are optional. 3) OFDM technology allows access to base stations that are not reachable by line-of-sight. Therefore, the 5.8GHz point-to-point microwave system is also increasingly used in this type of solution.