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Production industrial radio relay stations

Kind code of ref document : A1. Effective date : A radio base station for performing communication with a radio terminal via a relay station, including a radio frame generation unit which generates a radio frame including a signal relay region allocated in the relay station to transmit received data with predetermined delay from the radio terminal or the radio base station to the radio base station or the radio terminal respectively, and a data relay region allocated in the relay station to perform demodulation and decode, further encode and modulation processing for receive data and to transmit from the radio terminal or the radio base station to the radio base station or the radio terminal respectively; and a transmission unit which transmits the generated radio frame to the relay station. TECHNICAL FIELD The present invention relates to a radio base station, relay station, radio relay system, and radio relay method using radio communication, and more particularly to a radio base station, relay station, radio relay system, and radio relay method in which processing delay is reduced and a radio resource can be used with maximum efficiency. IEEE In this way IEEE

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Kind code of ref document : A1. Effective date : A radio base station for performing communication with a radio terminal via a relay station, including a radio frame generation unit which generates a radio frame including a signal relay region allocated in the relay station to transmit received data with predetermined delay from the radio terminal or the radio base station to the radio base station or the radio terminal respectively, and a data relay region allocated in the relay station to perform demodulation and decode, further encode and modulation processing for receive data and to transmit from the radio terminal or the radio base station to the radio base station or the radio terminal respectively; and a transmission unit which transmits the generated radio frame to the relay station.

TECHNICAL FIELD The present invention relates to a radio base station, relay station, radio relay system, and radio relay method using radio communication, and more particularly to a radio base station, relay station, radio relay system, and radio relay method in which processing delay is reduced and a radio resource can be used with maximum efficiency.

IEEE In this way IEEE To solve this problem, in IEEE As Fig. By improving the radio quality between the radio base station BS and the relay station RS and between the relay station RS and the radio terminal MS 2, throughput can be improved compared with the case of the radio terminal MS 2 directly communicating with the radio base station BS. Also as depicted in Fig. Available relay method in the relay station RS are a method of relaying a receive signal by re-transmitting the receive signal without demodulation and decoding Amplifier and Forward: AF method , and a method of relaying receive signal by demodulating and decoding the receive signal, encoding and modulating the decoded data again, and transmitting the data Decode and Forward: DF method e.

As depicted in Fig. In this case, the processing delay is small since the relay station RS does not demodulate or decode the transmission signal, and does not perform encoding and modulation processing either. In uplink as well, the relay station RS does not demodulate or decode receive signal from the radio terminal MS 2, but retransmits the receive signal as is, thereby a relay to the radio base station BS is executed.

In this case, demodulation decoding processing is performed, so transmission quality can be improved since the signal, distorted by the influence of the propagation path, can be restored to the original form and then be relayed.

In uplink as well, the relay station RS demodulates and decodes receive signal from the radio terminal MS 2 to obtain data, performs encoding and modulation processing on this data, and sends the data to the radio base station BS side.

As mentioned above, there are two methods when data is relayed: retransmitting received signal without demodulating and decoding the received signal; and obtaining receive data by demodulating and decoding received signal, and then retransmitting the data after performing encoding and modulation again.

In terms of processing delay, the latter has a disadvantage, but in terms of quality, the former has a disadvantage, so it is difficult to improve quality while suppressing the processing delay. It is an object in one aspect of the present invention to perform an ideal relay using these methods with skill. According to an aspect of the present invention, a radio base station for performing communication with a radio terminal via a relay station, including a radio frame generation unit which generates a radio frame including a signal relay region allocated in the relay station to transmit received data with predetermined delay from the radio terminal or the radio base station to the radio base station or the radio terminal respectively, and a data relay region allocated in the relay station to perform demodulation and decode, further encode and modulation processing for receive data and to transmit from the radio terminal or the radio base station to the radio base station or the radio terminal respectively; and a transmission unit which transmits the generated radio frame to the relay station.

According to another aspect of the present invention, a relay station for relaying communication with a radio terminal and a radio base station, including a reception unit which receives a radio frame including a signal relay region and a data relay region; and a sort unit which, in the signal relay region, transmits received data with predetermined delay from the radio terminal or the radio base station to the radio base station or the radio terminal respectively, and, in the data relay region, performs demodulation and decode, further encode and modulation processing for receive data and transmits from the radio terminal or the radio base station to the radio base station or the radio terminal respectively.

According to another aspect of the present invention, a radio relay system for performing communication with a radio terminal and a radio base station via a relay station, a radio frame generation unit in the radio base station, which generates a radio frame including a signal relay region and a data relay region; a transmission unit in the radio base station, which transmits the generated radio frame to the relay station; a reception unit in the relay station, which receive the radio frame; a sort unit in the relay station, which, in the signal relay region, transmits received data with predetermined delay from the radio terminal or the radio base station to the radio base station or the radio terminal, and, in the data relay region, performs demodulation and decode, further encode and modulation processing for receive data and transmits from the radio terminal or the radio base station to the radio base station or the radio terminal respectively.

According to another aspect of the present invention, a radio relay method for performing communication with a radio terminal and a radio base station via a relay station, including generating a radio frame including a signal relay region and a data relay region in the radio base station; transmitting the generated radio frame to the relay station in the radio base station; a reception unit in the relay station, which receives the radio frame; transmitting in the signal relay region received data with predetermined delay from the radio terminal or the radio base station to the radio base station or the radio terminal; and performing demodulation and decode, further encode and modulation processing for receive data from the radio terminal or the radio base station, and transmitting, in the data relay region, to the radio base station or the radio terminal respectively, in the relay station.

According to the present invention, an ideal relay can be implemented. Also a radio base station, relay station, radio relay system, and radio relay method, which can decrease processing delay for data which has strict delay restrictions, and can improve quality for data for which delay is more tolerated, can be provided.

The embodiment s focuses on the existence of data which is strictly restricted in delay e. A best mode for carrying out the present invention will now be described.

The MMR-Link indicates communication between a radio base station and relay station, and Access-Link indicates communication between a relay station and the radio terminal. This radio relay system is a relay system included in the radio terminal and radio base station via relay station.

According to the present embodiment, the radio frame is divided into signal relay areas S1 to S4 for relaying the radio frame using the AF method, and data relay areas D1 to D4 for relaying the radio frame using the DF method. The second signal relay area S2 and the second data relay area D2 are disposed at positions shifted from the first signal relay area S1 and first data relay area D1 for a predetermined slot time respectively. S2, in which the signal of S1 is retransmitted using the AF method, is set in a same sub-frame, as depicted in Fig.

If the predetermined slot time is insufficient, S2 and D2 are switched in the format depicted in Fig. Another example to secure the predetermined time is to insert the data relay areas D1 and D2 in this case between the signal relay areas S1 and S2. On the other hand, as depicted in Fig. The fourth signal relay area S4 and the fourth data relay area D4 are disposed at positions shifted from the third signal relay area S3 and the third data relay area D3 for a predetermined slot time respectively.

The methods to secure the predetermined time, described for the case of downlink, can also be used here. In the radio frame, an area other than the signal relay areas S1 to S4 may be used for the data relay areas D1 to D4, or for the transmission and reception of the relay station and radio terminal under the radio base station. The present embodiment s describes the signal relay areas S1 to S4 and data relay areas D1 to D4 as depicted in Fig.

The relay station RS receives signal from the radio base station BS in the first signal relay area S1, and sends the received signal to the radio terminal MS 2 in the second signal relay area S2 in the same radio frame.

At this time, the relay station RS performs required signal amplification processing without performing demodulation and modulation processing, and sends the signal in the second signal relay area S2. In other words, the relay station RS sends the signal received from the radio base station BS in the signal relay area first signal relay area S1 of the MMR-Link of the downlink sub-frame to the radio terminal MS in the signal relay area second signal relay area S2 of Access-Link in the same radio frame.

The relay processings in the first and second signal relay areas in the relay station RS are performed in the same radio frame. The transmission may be performed in the next frame if a delay is within tolerance. On the other hand, the relay station RS receives signal from the radio base station BS in the first data relay area D1, performs demodulation and decoding more preferably on the received signal, then performs encoding more preferably and demodulation processing on the signal, and sends it to the radio terminal MS 2.

In other words, the relay station RS performs demodulation and so on, on the signal received from the radio base station BS in the data relay area first data relay area D1 of the MMR-Link of the downlink sub-frame, for example, and sends the signal to the radio terminal MS in the data relay area second data relay area D2 of Access-Link in the radio frame.

In the case of uplink as well, the relay station RS sends signal from the radio terminal MS to the radio base station BS in the same radio frame in the signal relay area third and fourth signal relay areas S3 and S4 , performs demodulation and so on in the data relay area third and fourth data relay areas D3 and D4 , and sends to the radio base station BS.

As described above, in the present embodiment s , the radio frame including the signal relay areas S1 to S4 and data relay areas D1 to D4 is constructed to transmit and receive data and signals, so the data in the signal relay areas S1 to S4 is not demodulated and so on in the relay station RS, and is sent to the radio terminal MS, so processing delays can be decreased and requirements for data which has strict delay restrictions e.

Data in the data relay areas D1 to D4 are communicated in the relay station RS using a radio communication method matching each link, so the quality can be improved, and a radio resource can be used with maximum efficiency.

In this case, with the DF method, relay is not performed in the same radio frame, but the relay station RS sends the received data in the data relay area second data relay area D2 of Access-Link in a subsequent radio frame, as depicted in Fig.

In the case of the example in Fig. Needless to say, the data may be sent in an even later frame if it takes more time to demodulate and decode the data.

This is because real-time processing is secured for signal relay with respect to data relay. Considering processing delay in the relay station RS, the radio base station BS sends the data to the relay station RS in advance.

The data transmission and reception considering the processing delay is exactly the same in the case of uplink. This is because in each case of the AF method, the relay station RS sends the signal received from a transmission station the radio base station BS or radio terminal MS to a receive station the radio terminal MS or radio base station BS.

If the signal relay areas S1 to S4 are used for data transmission and reception, it is preferable to determine a radio communication method in an area by comparing the respective line qualities e.

This is because matching the radio communication method with the lower line quality can suppress the generation of errors in the communication between the radio base station BS and radio terminal MS. In order to determine the radio communication method to match the lower line quality, the line quality of each link must be compared.

In the present embodiment s , the line quality of MMR-Link is measured under control of the radio base station BS, and the line quality of Access-Link is measured under control of the relay station RS.

The line quality can also be measured by having the radio terminal MS report the received line quality to the relay station RS. The radio base station BS determines the radio communication method in the signal relay areas S1 to S4 so as to match the lower line quality, based on the line quality information of both links. If a same signal robust signal, such as BPSK Binary Phase Shift Keying is used for all radio terminals MS, for the radio communication method used for the signal relay areas S1 to S4, the line quality need not be measured or compared.

On the other hand, for the radio communication method in the data relay areas D1 to D4 , it may be determined to match the respective line quality of MMR-Link and Access-Link.

This is because the relay station RS performs processing of demodulation and decoding, and encoding and modulation that match each link, as mentioned above. Therefore one link need not be concerned with the line quality of the other link. Since the radio communication method in each data relay area is determined to match the respective line quality, the radio resource can be used efficiently.

Now the configuration and operation of the radio base station BS will be described with reference to Fig. The radio base station BS includes a receive unit 11, demodulation unit 12, decoding unit 13, control data extraction unit 14, network interface IF unit 15, MAP information generation unit 16, data buffer 17, encoding unit 18, modulation unit 19, transmission unit 20, and control unit The MAP information generation unit 16 further includes a sorting determination unit and area determination unit The receive unit 11 receives a data packet, control message e.

By the control of the control unit 21, the data packet and so on is demodulated by the demodulation unit 12, and is decoded by the decoding unit The control data extraction unit 14 outputs the control message to the MAP information generation unit 16, and outputs the data packet to the network IF unit The MAP information generation unit 16 generates MAP information, such as DL-MAP and UL-MAP, based on the status of the data buffer 17, the control message, and the sorting determination unit of the MAP information generation unit 16 determines which data is transmitted and received in the signal relay areas S1 to S4, or transmitted and received in the data relay areas D1 to D4, thereby data is sorted.

The area determination unit determines which areas in the radio frame become the signal relay areas S1 to S4 and data relay areas D1 to D4. The area is determined based on the data and signal amount of data and signal respectively, and so on.

The MAP information is stored in the data buffer 17, along with other data transmission data to the relay station, and transmission data to the radio terminal MS. The area determination unit may only determine the signal relay areas S1 to S4, regarding other areas as the data relay areas D1 to D4. Instead of the sorting determination unit and area determination unit creating MAP information in which the signal relay areas S1 to S4 and data relay areas D1 to D4 are specified, a MAC Management Message specifying these areas hereafter called a signal relay area notification message may be created.

The MAP information stored in the data buffer 17 is sent to the relay station RS and radio terminal MS via the encoding unit 18, modulation unit 19, and transmission unit 20, along with other data. When transmission is performed in the signal relay areas S1 and S2 downlink , the signal, which is sent in the area, is encoded in the encoding unit 18 and modulated in the modulation unit 19, so as to match with the lower line quality of MMR-Link and Access-Link.

When reception is performed in the third and fourth signal relay areas S3 and S4 uplink as well, the signal is demodulated in the demodulation unit 12 and decoded in the decoding unit 13, so as to match with the lower line quality of each link. The control unit 21 controls this demodulation and so on by controlling the demodulation unit 12, decoding unit 13, encoding unit 18, modulation unit 19, and so on.

In this example, the signal relay areas S1 to S4 and data relay areas D1 to D4 are specified using the signal relay area notification message. This is also the same for the case of using MAP information. When processing starts S30 , the MAP information generation unit 16 performs the area determination processing S31 , and generates the signal relay area notification message specifying the signal relay areas S1 to S4 and data relay areas D1 to D4.

If it is necessary to change the signal relay areas S1 to S4 Yes in S32 , the signal relay area notification message specifying the changed signal relay areas S1 to S4 is generated in the MAP information generation unit 16 S33 , and is sent via MMR-Link by controlling in the control unit 21 S And the processing ends S The signal relay area notification message can be stored in the data relay area and sent, for example.

This is because it is more convenient to send the message in the data area to acquire processing time to receive the message in the relay station RS. However, the message need not be sent to the radio terminal MS, so preferably this should be outside the target of the relay.

If there is not change in the signal relay areas S1 to S4 No in S32 , it is unnecessary to change the areas generated by the area determination processing S31 , and processing ends as is S The signal relay areas S1 to S4 are changed when the data volume is changed or when the operator performs manual operation, for example. This change is executed by the control unit 21 acquiring this information and notifying this information to the MAP information generation unit This flow chart is based on the assumption that change is generated only in the signal relay areas S1 to S4, but this is because if the signal relay areas S1 to S4 are determined, the rest of the areas are assumed to be the data relay areas D1 to D4.

In other words, the signal relay notification message is for notifying the boundary of the signal relay areas and data relay areas out of the transmission areas of the signals signals to be transmitted via MMR-Link from the radio base station BS to the relay station RS, and for notifying the boundary of the signal relay areas and data relay areas out of the transmission areas of the access link. Uplink is the same as this. The start point of the first signal relay area S1 or third signal relay area S3 as depicted in Fig.

The width number of symbols in the time axis direction in the first signal relay area S1 and so on in Fig.

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We have, also, partly described some telecommunication equipment used during the World War II on this territory and kept as war prize, as well as foreign wireless equipment obtained as military help or bought on the market and inserted in equipment of Yugoslav People's Army telecommunication units. The site primarily elaborates mobile radio devices, but we, also, gave a lot of space to mobile radio-relay and telephone-telegraph devices, because they together make integral mobile military telecommunication system. The time period that is covered with this analyze can be roughly divided on period up to , when Yugoslav Army, in its equipment, hade almost completely signal resources captured during the war, or equipment that was generously donated by United States of America. Yugoslavia was accepted readily this help because of the conflict with Soviet Union, from , on the score of famous Inform-biro Resolution. It was, also, negotiated about its inclusion into Western Alliance.

US5815795A - Oscillation detecting system for wireless repeater - Google Patents

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It is part of the Belarus-based Interstate Development Corporation. The Omsk Popov Radio Plant is an important Russian developer of advanced communications systems, including mobile systems, for military and civil use. Production includes the "Malyutka" and "Azid" families of radio relay and radiotelephone stations for setting up local telephone communication lines and for local communications in the areas of transport, power systems, petroleum, gas pipelines, etc. The Omsk Popov Radio Plant also produces telescopic antenna masts. From Wikipedia, the free encyclopedia. This article is an orphan , as no other articles link to it.

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From the afternoon singles chart on the radio, television broadcasts, mobile phones, to the electronic doorbell — we are invisibly surrounded by the wireless networks and this is exactly what our hobby consists of. Through this activity we get in contact with like-minded people around the world. Radio amateurs are not any particular human species, but technically interested people who are curious and enjoy the pleasure of the unexpected.

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Omsk Manufacturing Association named after A.S. Popov

Microwave transmission is the transmission of information by microwave radio waves. In the s, large transcontinental microwave relay networks, consisting of chains of repeater stations linked by line-of-sight beams of microwaves were built in Europe and America to relay long distance telephone traffic and television programs between cities. Communication satellites which transferred data between ground stations by microwaves took over much long distance traffic in the s. In recent years, there has been an explosive increase in use of the microwave spectrum by new telecommunication technologies such as wireless networks , and direct-broadcast satellites which broadcast television and radio directly into consumers' homes. Microwaves are widely used for point-to-point communications because their small wavelength allows conveniently-sized antennas to direct them in narrow beams, which can be pointed directly at the receiving antenna. This allows nearby microwave equipment to use the same frequencies without interfering with each other, as lower frequency radio waves do. Another advantage is that the high frequency of microwaves gives the microwave band a very large information-carrying capacity; the microwave band has a bandwidth 30 times that of all the rest of the radio spectrum below it.

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Resource Management with Limited Capability of Fixed Relay Station in Multi-Hop Cellular Networks

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The present invention relates to an oscillation detecting system for a wireless repeater and, more specifically, to an oscillation detecting apparatus for detecting that a wireless repeater is oscillating, and a wireless repeater having an ability to detect its own oscillation. The wireless repeater intervenes between a base station and a mobile station brought in communication with each other through a time division multiple access abbreviated in general to "TDMA" system.

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  1. Golticage

    As it is curious.. :)

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