CN109104698B

CN109104698B - Distributed communication method and system

Info

Publication number: CN109104698B
Application number: CN201710473815.5A
Authority: CN
Inventors: 邱创群; 刘孟申; 王绍伟
Original assignee: Yiqin Communications Co ltd
Current assignee: Yiqin Communications Co ltd
Priority date: 2017-06-21
Filing date: 2017-06-21
Publication date: 2021-09-07
Anticipated expiration: 2037-06-21
Also published as: CN109104698A

Abstract

The distributed communication method includes a first station receiving a downlink signal of a base station; broadcasting a downlink signal by the first station; each of the plurality of second stations receives the downlink signal and adjusts the downlink signal by the downlink compensation gain to generate a compensated downlink signal. The power levels of the compensated downlink signals generated by the second stage are substantially the same.

Description

Distributed communication method and system

Technical Field

The present invention describes a distributed communication method and system thereof, and more particularly, to a communication method for improving the transmission quality of uplink and downlink signals.

Background

With the technology, various communication devices, such as mobile phones, remote controllers, etc., have been widely used in daily life. Taking a mobile phone as an example, when two users use the mobile phone to communicate, the mobile phone of the user at the transmitting end transmits an Uplink (Uplink) signal to the base station, and the base station processes the Uplink signal and generates a downlink signal to the mobile phone of the user at the receiving end. Since both uplink and downlink signals are transmitted through a Wireless Channel (Wireless Channel), the location, moving speed, and environmental factors of a user may affect the quality of the Wireless Channel. In many cases, due to poor quality of a wireless channel, a Signal-to-Noise Ratio (Signal-to-Noise Ratio) of a service Signal between a mobile phone of a user at a transmitting end and a mobile phone of a user at a receiving end during Signal communication through a base station is reduced, which results in poor communication quality and even communication interruption.

In order to improve communication quality, a radio Repeater (Repeater) is generally used to amplify signals, and the amplified uplink/downlink signals are transmitted to a user equipment or a base station. For example, a repeater with dual antennas can be disposed between a base station and a handset of a user at a receiving end. The repeater with double antennas receives the downlink signal generated by the base station, amplifies the downlink signal and transmits the amplified downlink signal to the mobile phone of the user at the receiving end. However, with the increasing complexity of the current building structure, the probability of signal attenuation due to signal shielding is more and more frequent. Therefore, if only one set of two-antenna repeater systems is used in a particular building, the transmission quality cannot be improved for all locations in the building where the signal is attenuated. In other words, the general dual-antenna repeater can only improve the signal transmission quality in a specific range, and cannot simultaneously improve the signal transmission quality in many ranges. Therefore, a distributed communication system is developed to improve the transmission quality of all points of the building where signals are attenuated, which is a topic of urgent discussion today in information development.

Disclosure of Invention

An embodiment of the present invention provides a distributed communication method, including a first station receiving a downlink signal of a base station; broadcasting a downlink signal by the first station; each of the plurality of second stations receives the downlink signal and adjusts the downlink signal by the downlink compensation gain to generate a compensated downlink signal. The Power levels (Power levels) of the compensated downlink signals generated by the second stage are substantially the same.

Another embodiment of the present invention provides a distributed communication method, including a plurality of second stations receiving a plurality of uplink signals; each of the second machines adjusting a corresponding one of the uplink signals by an uplink compensation gain to generate a compensated uplink signal; each second machine station transmits the compensated uplink signal to the first machine station; and the first machine station transmits the compensated uplink signal to the base station. The power levels of the corresponding compensated uplink signals of the second machines are substantially the same.

Drawings

Fig. 1 is an architecture diagram of an embodiment of a distributed communication system of the present invention.

Fig. 2 is a diagram illustrating downlink communication performed in the distributed communication system of fig. 1.

Fig. 3 is a schematic diagram illustrating a location of a user device virtually moved to the vicinity of a first station when downlink communication is performed in the distributed communication system of fig. 1.

Fig. 4 is a diagram illustrating uplink communication performed in the distributed communication system of fig. 1.

Fig. 5 is a schematic diagram illustrating a location of a user device virtually moved to the vicinity of a first station when uplink communication is performed in the distributed communication system of fig. 1.

Fig. 6A is a flow chart of a test phase of a distributed communication method for performing downlink communication in the distributed communication system of fig. 1.

Fig. 6B is a flow chart of a signal transmission phase of a distributed communication method for performing downlink communication in the distributed communication system of fig. 1.

Fig. 7A is a flow chart of a test phase of a distributed communication method for performing uplink communication in the distributed communication system of fig. 1.

Fig. 7B is a flow chart of a signal transmission phase of a distributed communication method of performing uplink communication in the distributed communication system of fig. 1.

Detailed Description

Fig. 1 is an architecture diagram of an embodiment of a distributed communication system 100 of the present invention. The distributed communication system 100 includes a base station BS, a first station MS, a plurality of second stations S1-S12, and a plurality of coupling devices C1-C8. It should be understood that the number of second machines, the number of coupling devices, and the link structure of the coupling devices in the distributed communication system 100 of the present invention are not limited by fig. 1. The distributed communication system 100 shown in fig. 1 is merely one embodiment of the present invention. In fig. 1, the base station BS may be a stationary high power multi-channel two-way radio transmitter. The first station MS may be installed in a location with a small signal attenuation of a building, for example, a roof of the building, for performing wireless communication with the base station BS. The first Station MS may also be considered as a Master Station (Master Station/Station), which may include a Donor Antenna (Donor Antenna) for wireless communication with the BS. The second stations S1-S12 may also be regarded as Slave stations (Slave stations) for performing wired communication with the first Station MS. Each of the plurality of second stations S1-S12 may include a Service Antenna (Service Antenna) for transmitting signals with the ue within a predetermined signal range. For example, if the second station S1 has the user equipment UE within the signal range R, the user equipment UE can communicate with the base station through the second station S1 and the first station MS. In the distributed communication system 100, the plurality of second stations S1 to S12 and the first station MS may be connected by any wire. For example, the second machines S1-S12 and the first machine MS may be connected by a plurality of coupling devices C1-C8 in a tree topology. The plurality of coupling devices C1-C8 may be splitters (Splitter/Coupler) having directional transmission function. However, in the distributed communication system 100, the topology of the wired network formed by the plurality of coupling devices C1-C8 may not be a Ring Loop Structure (Ring Loop Structure). In other words, the downlink signals broadcast by the first station MS are transmitted to a plurality of second stations S1-S12. The uplink signals transmitted by the second stations S1-S12 are transmitted to the first station MS. The uplink signal transmitted by a second apparatus is transmitted to another second apparatus through the ring structure, which does not occur in the distributed communication system 100.

The distributed communication system 100 of the present invention is applicable to buildings, and has a function of improving the transmission quality at a location where all wireless signals are attenuated in the building. For example, a first station MS communicating with the base station BS may be disposed at the top of the building to ensure that a Channel (Channel) of wireless communication between the base station BS and the first station MS is good. As mentioned above, the second stations S1-S12 may communicate with the first station MS through the coupling devices C1-C8 by wired connection (e.g., Cable connection). Therefore, the second stations S1-S12 are not shielded by the building and will not cause the wireless signal to be attenuated quickly, but only by the path power attenuation of the wired link. Therefore, when the plurality of second stations S1-S12 are disposed at locations where many wireless signals are attenuated in the building, the wired transmission method can be used to overcome the degradation of the wireless signals. For example, the second station S1 may be located in a basement of a building, the second station S2 may be located in a conference room of the building, and so on. As mentioned above, since the plurality of second stations S1-S12 can communicate with the first station MS through the plurality of coupling devices C1-C8 in a wired connection manner, each of the second stations has power loss of an uplink path and power loss of a downlink path with respect to the first station MS. In order to optimize the transmission power or the reception power of each second station, the present invention provides a distributed communication method for performing downlink communication and a distributed communication method for performing uplink communication, which are described below.

Fig. 2 is a diagram illustrating downlink communication performed in the distributed communication system 100. In the distributed communication system 100 of the present invention, downlink communication is performed in two stages. The first stage is a testing stage for detecting the downlink path power attenuation between each of the plurality of second stations S1-S12 and the first station MS. The second stage is a downlink signal transmission stage, which aims to properly adjust the power of the downlink signal according to the degree of downlink path power attenuation between each second station and the first station MS, so as to optimize the communication quality of the plurality of second stations S1-S12. The two-phase downlink communication flow will be described below. During the test phase, the first station MS broadcasts a downlink test signal DLP. The DLP Signal can be any known Training Signal (Training Signal) or Pilot Signal (Pilot Signal). For example, the first MS station broadcasts power A_DLdBm (Decibel-Milliwatts, Decibel Milliwatts) of the downlink test signal DLP. After the first station MS broadcasts the downlink test signal DLP, each of the plurality of second stations S1-S12 receives the downlink test signal DLP through its downlink path. For example, after the first station MS broadcasts the downlink test signal DLP, the downlink test signal DLP is transmitted to the second station S1 through the coupling device C1 and the coupling device C4. Thus, the downlink path DPL1 received by the second station S1 may be defined as a path from the first station MS through the coupling device C1 and the coupling device C4 to the second station S1. Similarly, the second machine S4 is connectedThe received downlink path may be defined as the path from the first station MS through coupling C1 and coupling C5 to the second station S4. And so on, each second machine has a corresponding downlink path. However, it should be understood that path power attenuation occurs because the downlink path between the second station and the first station MS is wired transmission. The power attenuation levels vary with different distances, different materials of transmission lines, or different coupling devices. For example, the aforementioned path power attenuation of the downlink path DPL1 (the second station S1 and the first station MS) is X_DLdBm. The second station S1 may determine the signal strength A of the DLP signal according to the downlink test signal transmitted by the first station MS_DLdBm, by subtracting the signal strength of the received downlink test signal DLP, the path power attenuation (X) of the downlink path DPL1 can be calculated_DLdBm). In addition, since the second station S1 can perform two-way communication with the first station MS by wire, when the second station S1 calculates the path power attenuation of the downlink path DPL1 to be equal to X_DLAfter dBm, the first MS also obtains the path power attenuation of the downlink path DPL1 of the second MS 1 equal to X_DLdBm information. In analogy, each second station calculates the downlink path power attenuation amount and synchronizes the information of the path power attenuation amount with the first station MS. Finally, each second station calculates the downlink path power attenuation, and the first station MS obtains information of all downlink path power attenuations.

Also, the distributed communication system 100 may set a predetermined value. The default value can be defined as the maximum amount of path power attenuation that can be tolerated (or referred to as compensated) in the distributed communication system 100. If the downlink path power attenuation amounts corresponding to some of the second machines are greater than the predetermined value, it indicates that the distributed communication system 100 cannot completely compensate the downlink path power attenuation amounts, and therefore the distributed communication system 100 will send out a warning signal. For example, the default value can be set to D_valuedBm, if the second machine station S1 goes downstreamPath power attenuation X of link path DPL1_DLdBm is greater than D_valuedBm indicates that the second stage S1 cannot completely compensate the power attenuation of the downlink path. The distributed communication system 100 will issue an alert message to alert an administrator or user. However, as mentioned above, the degree of the path power attenuation depends on the distance (Cable length) between the second station and the first station MS, so the distributed communication system 100 may also directly detect the predetermined transmission path attenuation amount corresponding to the farthest second station among the first station MS and the plurality of second stations S1 to S12. For example, if the farthest second stage is S7 and the path power attenuation of the farthest second stage S7 is smaller than the predetermined value (D)_valuedBm), the path power attenuation of all the second machines is less than the predetermined value (D)_valuedBm). The distributed communication system 100 may fully compensate back the amount of downlink path power attenuation for all of the second stations S1-S12. Or, if the distances between the second machines and the first machine MS are about the same, the predetermined transmission path attenuation corresponding to the second machine with the largest transmission path attenuation in practice is compared with the preset value (D)_valuedBm) are compared.

Then, each second machine can generate a downlink compensation gain according to the downlink path power attenuation amount so as to cancel the downlink path power attenuation amount. For example, the path power attenuation of the DPL1 of the second stage S1 is X_DLdBm. The second stage S1 generates a power attenuation X approaching the downlink path_DLdBm of downlink compensation gain G_DL. By analogy, each of the second stages S1-S12 produces a downlink compensation gain that approaches the corresponding downlink path power attenuation. However, as mentioned above, all the second stations S1-S12 can communicate with the first station MS in a wired manner in a bidirectional manner, so that the first station MS can also obtain information of the downlink compensation gain of each second station.

Then, in the downlink signal transmission phase, the first MS receives the downlink signal of the BS. The first MS receives the downlink signal from the BS and performs appropriate processing to avoid noise amplification. For example, after receiving the downlink Signal of the base station BS, the first station MS may amplify the downlink Signal with a downlink power gain, for example, a Low Noise Amplifier (LNA) is used to perform a first stage amplification, so that the Signal-to-Noise Ratio (Signal-to-Noise Ratio) is not reduced too much when performing the wired transmission after the downlink Signal. Then, the first MS may broadcast the downlink signal such that each of all the second stations S1 through S12 receives the downlink signal through the corresponding downlink path. As mentioned above, the second stage S1-S12 may correspond to downlink paths with different amounts of power attenuation. Therefore, the power of the downlink signals received by the second stations S1-S12 may also be different. Then, each second stage adjusts the received downlink signal by the aforementioned downlink compensation gain to generate a compensated downlink signal. The second machine adjusts the received downlink signal by using the downlink compensation gain, which is equivalent to canceling the effect of the downlink path power attenuation amount. Therefore, the power of the compensated downlink signal is approximately equal to the power of the downlink signal broadcast by the first station MS. In other words, after each of the second stations adjusts the received downlink signal by the corresponding downlink compensation gain, the power levels of the compensated downlink signals generated by the second stations S1-S12 are substantially the same. Thus, the power level of the received downlink signal is substantially the same for the user device UE, regardless of where it is located, e.g., the user device UE is located in a basement, conference hall, or lobby. In other words, the distributed communication system 100 can be applied in a building, and can provide good downlink communication quality at any position in the building.

Fig. 3 is a diagram illustrating a distributed communication system 100 in which the location of a user equipment is virtually moved to the vicinity of a first station MS when downlink communication is performed. As mentioned above, the second stations S1-S12 may be located at different locations and may transmit downlink signals with substantially the same power level. Therefore, for the ue, the power level of the downlink signal received by the second station is almost a fixed value regardless of the location of the ue. In other words, since the power levels of the received downlink signals are almost the same for the user apparatuses in different locations, the positions of the user apparatuses in different locations are equivalently virtually moved to the vicinity of the first station MS. In other words, the ue detects its radio channel environment and device coordinates according to the power level of the received downlink signal.

Although different user equipments are located at different positions, the different user equipments determine that the different user equipments are located near the first station MS because the downlink signals with almost the same power level are received. As shown in fig. 3, user equipment UE1, user equipment UE2, user equipment UE3, and user equipment UE4 are located at different locations, however, all user equipment UEs 1-4 receive downlink signals with almost the same power level. Therefore, the location of the UE1 is determined to be close to the UE 1' near the first station MS. The location of the UE2 is determined to be close to the UE 2' near the first MS. The location of the user equipment UE3 is determined to be near the location UE 3' near the first MS by virtualization. The location of the user equipment UE4 is determined to be near the location UE 4' near the first MS by virtualization. The base station BS is in wireless communication with only the first station MS. Therefore, for the BS, the BS considers the positions of the UEs 1-4 to be UEs 1 '-4', respectively. In other words, by the application of the distributed communication system 100, the locations of all the user equipments are virtually moved to the locations near the first station MS, and the locations of all the user equipments detected by the base station BS are also the locations near the first station MS. Therefore, the effective radio channel between the base station BS and all the user equipments is the radio channel between the first MS and the base station BS. As mentioned above, the first machine MS may be installed in a place where the signal attenuation of the building is small, for example, a roof of the building. Therefore, all the user equipments have good downlink communication quality under the condition that the radio channel between the first station MS and the base station BS is very good.

Fig. 4 is a diagram illustrating uplink communication performed in the distributed communication system 100. In the distributed communication system 100 of the present invention, the uplink communication is performed in two stages. The first stage is a testing stage for detecting the uplink path power attenuation between each of the plurality of second stations S1-S12 and the first station MS. The second phase is an uplink signal transmission phase, which aims to properly adjust the power of the uplink signal according to the degree of uplink path power attenuation between each second station and the first station MS, so as to optimize the communication quality of the plurality of second stations S1-S12. The two-phase uplink communication flow will be described below. During the testing phase, each second station sends an uplink test signal to the first station MS. For example, the second station S1 sends an uplink test signal ULP to the first station MS. The uplink test Signal ULP may be any known Training Signal (Training Signal) or Pilot Signal (Pilot Signal). For example, the second station S1 has a transmission power B_ULdBm uplink test signal ULP to the first station MS. The ul test signal ULP from the second station S1 is transmitted to the first station MS through the coupling device C4 and the coupling device C1. Therefore, the uplink path UPL1 corresponding to the second station S1 can be defined as a path from the second station S1 to the first station MS through the coupling device C4 and the coupling device C1. Similarly, the uplink path corresponding to the second station S4 can be defined as the path from the second station S4 to the first station MS through the coupling device C5 and the coupling device C1. And so on, each second machine has a corresponding uplink path. It should be understood that since the uplink paths between the second stations S1-S12 and the first station MS are wired transmission, path power attenuation is generated, and the power attenuation is different in different distances, different transmission lines made of different materials, or different coupling devices. For example, the foregoing haveAnd the uplink path UPL1 (the second station S1 and the first station MS) has a path power attenuation of X_ULdBm. The first station MS may determine the signal strength B of the uplink test signal ULP sent by the second station S1_ULdBm, by subtracting the signal strength of the received uplink test signal ULP, the path power attenuation (X) of the uplink path UPL1 can be calculated_ULdBm). In addition, since the second station S1 can perform bidirectional communication with the first station MS by wire, when the first station MS calculates that the path power attenuation of the uplink path UPL1 corresponding to the second station S1 is equal to X_ULAfter dBm, the second station S1 also obtains the path power attenuation of its uplink path UPL1 equal to X_ULdBm information. In analogy, each second station obtains the corresponding uplink path power attenuation amount, and the first station MS also obtains the information of the uplink path power attenuation amounts of all the second stations.

Similarly, the distributed communication system 100 may also set a predetermined value. The default value can be defined as the maximum uplink path power attenuation that can be tolerated (or compensated for) in the distributed communication system 100. If the uplink path power attenuation amounts corresponding to some of the second apparatuses are greater than the predetermined value, it indicates that the distributed communication system 100 cannot completely compensate the uplink path power attenuation amounts, and therefore the distributed communication system 100 may send a warning signal. Similarly, the distributed communication system 100 may also directly detect the predetermined transmission path attenuation amount corresponding to the farthest second station among the first station MS and the plurality of second stations S1 through S12. If the predetermined transmission path attenuation (uplink) corresponding to the farthest second station is smaller than the predetermined value, it can be estimated that the uplink path power attenuation of all the second stations S1-S12 is smaller than the predetermined value. The distributed communication system 100 may fully compensate back the uplink path power attenuation of all the second stations S1-S12.

Then, each second machine can generate uplink compensation gain according to the uplink path power attenuation amount so as to cancel the uplink path power attenuation amount. Examples of such applications areIn other words, the uplink path power attenuation of the uplink path UPL1 of the second station S1 is X_ULdBm. The second station S1 will generate an approximate uplink path power attenuation X_ULUplink compensation gain G of dBm_UL. By analogy, each of all the second stations S1-S12 generates an uplink compensation gain that approaches the corresponding uplink path power attenuation. However, as mentioned above, all the second stations S1-S12 can perform bidirectional communication with the first station MS in a wired manner, so that the first station MS can also obtain information of the uplink compensation gain of each second station.

Then, in the uplink signal transmission phase, the second stations S1-S12 receive a plurality of uplink signals. Each of the second stations S1-S12 processes the corresponding one of the uplink signals appropriately. For example, the second station S1 may use the uplink signal sent by the user equipment UE with the aforementioned uplink compensation gain G_ULAmplifying to generate a compensated uplink signal. Therefore, the compensated uplink signal generated by the second station S1 is transmitted to the first station MS via the uplink path UPL 1. As mentioned previously, the uplink path power attenuation of the uplink path UPL1 is X_ULdBm, so that the power of the compensated uplink signal attenuates by X after it has passed through the uplink path UPL1_ULdBm. However, since the second station S1 has previously used the uplink signal transmitted by the user equipment UE with the uplink compensation gain G_UL(approximately equal to the uplink path power attenuation by X_ULdBm) and the power of the power attenuated compensated uplink signal received by the first station MS will be approximately equal to the power of the uplink signal transmitted by the user equipment UE. It can also be said that the second station S1 adds the uplink signal with the uplink compensation gain G_ULThe amplifying action is to cancel the uplink path power attenuation X of the uplink path UPL1_ULdBm. And so on, each second machine can correspondingly and compensated uplinkThe link signal is transmitted to the first station MS. Therefore, the power levels of the corresponding compensated uplink signals of the second stations S1-S12 received by the first station MS are substantially the same. The first MS may then adjust these received compensated uplink signals to comply with the signal power specification of the base station BS. For example, the first MS may collectively amplify the compensated received uplink signals with uplink power gain before transmitting them to the BS. Therefore, for the UE, the power level of the transmitted uplink signal, compensated and finally transmitted to the base station is substantially the same regardless of the location, such as the location of the UE in the basement, conference hall or lobby. In other words, the distributed communication system 100 can be applied to a building, and can provide good uplink communication quality at any position in the building.

Fig. 5 is a diagram illustrating a distributed communication system 100 in which the location of a user equipment is virtually moved to the vicinity of a first station MS when uplink communication is performed. As mentioned above, the second stations S1-S12 may be located at different locations, and the power levels of the uplink signals received by the first station MS are substantially the same. In other words, since the power level of the uplink signal transmitted to the base station BS is almost the same for the user apparatuses in different locations, the user apparatuses in different locations are equivalently virtually moved to the vicinity of the first station MS. In other words, since each of the second stations S1-S12 generates the uplink compensation gain approaching the corresponding uplink path power attenuation amount, it is determined that the ue at different locations is near the first station MS. As shown in fig. 5, user device UE1, user device UE2, user device UE3, and user device UE4 are located at different locations. However, the location of the user equipment UE1 is determined to be close to the location UE 1' near the first station MS by virtualization. The location of the UE2 is determined to be close to the UE 2' near the first MS. The location of the user equipment UE3 is determined to be near the location UE 3' near the first MS by virtualization. The location of the user equipment UE4 is determined to be near the location UE 4' near the first MS by virtualization. The base station BS is in wireless communication with only the first station MS. Therefore, for the BS, the BS considers the positions of the UEs 1-4 to be UEs 1 '-4', respectively. In other words, by the application of the distributed communication system 100, the locations of all the user equipments are virtually moved to the locations near the first station MS, and the locations of all the user equipments detected by the base station BS are also the locations near the first station MS. Therefore, the effective radio channel between the base station BS and all the user equipments is the radio channel between the first MS and the base station BS. As mentioned above, the first machine MS may be installed in a place where the signal attenuation of the building is small, for example, a roof of the building. Therefore, all the user equipments have good uplink communication quality under the condition that the radio channel between the first station MS and the base station BS is very good.

Comparing the downlink communication of fig. 3 with the uplink communication of fig. 5, it can be seen that the location of the user equipment is virtually moved to a location close to the first station MS. Therefore, the equivalent radio channel path between the location of the ue and the base station BS is the path between the first MS and the base station BS, whether uplink communication or downlink communication. Therefore, in the downlink communication, the power levels of the compensated downlink signals generated by the aforementioned second stations S1-S12 are substantially the same, and may be the first value. During uplink communication, the compensated uplink signals corresponding to the second equipments S1-S12 are transmitted to the base station with substantially the same power level, which may be a second value. Moreover, since the equivalent radio Channel path between the first station MS and the base station BS is shared by the uplink communication and the downlink communication (the same Channel), the first value (downlink power level) corresponding to the downlink communication approaches the second value (uplink power level) corresponding to the uplink communication. And, the first station MS and each of the second stations S1 to S12 can perform signal synchronization between the two stations by using the time signal, so that the uplink communication data and the downlink communication data are not delayed. Thus, if the distributed communication system 100 of the present invention is used in a building, users will have the quality of good uplink and downlink communications wherever they are.

Fig. 6A is a flowchart of a test phase of a distributed communication method for performing downlink communication in the distributed communication system 100. The flow of the testing phase of the distributed communication method for downlink communication includes steps S601 to S604. Any reasonable variation of the content of steps or sequence of steps is within the scope of the disclosure. Steps S601 to S604 are as follows.

Step S601: a first MS broadcasts a downlink test signal;

step S602: receiving a downlink test signal by each of the plurality of second stations S1-S12;

step S603: each second machine station generates a downlink path power attenuation amount according to the signal intensity of the downlink test signal;

step S604: each second machine station generates a downlink compensation gain according to the downlink path power attenuation amount.

The details and principles of steps S601 to S604 are described above, and therefore will not be described herein. Steps S601 to S604 may be regarded as the distributed communication system 100 during the testing phase of the downlink communication, in order to generate the downlink compensation gain corresponding to the downlink path of each second station. After the distributed communication system 100 executes steps S601 to S604, the downlink compensation gain corresponding to each second apparatus can be generated. The distributed communication system 100 can then continuously transmit downlink signals using the downlink compensation gain, as described below.

Fig. 6B is a flowchart of a signal transmission phase of a distributed communication method for performing downlink communication in the distributed communication system 100. The flow of the signal transmission phase of the distributed communication method of downlink communication includes steps S605 to S607. Any reasonable variation of the content of steps or sequence of steps is within the scope of the disclosure. Steps S605 to S607 are as follows.

Step S605: a first MS receives a downlink signal of a base station BS;

step S606: the first MS broadcasts the downlink signal;

step S607: each of the plurality of second stations S1-S12 receives the downlink signal and adjusts the downlink signal by a downlink compensation gain to generate a compensated downlink signal.

The details and principles of steps S605 to S607 are described above, and thus will not be described herein. Steps S605 to S607 may be regarded as the distributed communication system 100 during the signal transmission phase of the downlink communication, and each of the second apparatuses may compensate the downlink signal according to the downlink compensation gain generated in the test phase shown in fig. 6A. After each of the second stations adjusts the received downlink signal by the corresponding downlink compensation gain, the power levels of the compensated downlink signals generated by the second stations S1-S12 are substantially the same. Therefore, the user equipment can enjoy good downlink communication quality regardless of the location.

The distributed communication system 100 includes the testing phase shown in fig. 6A and the signal transmission phase shown in fig. 6B in downlink communication. After the distributed communication system 100 completes the testing phase by using the process of fig. 6A and obtains the downlink compensation gain of each second apparatus, the downlink signal transmission can be continuously performed according to the process of fig. 6B.

Fig. 7A is a flow chart of a test phase of a distributed communication method for performing uplink communication in a distributed communication system. The flow of the test phase of the distributed communication method for uplink communication includes steps S701 to S703. Any reasonable variation of the content of steps or sequence of steps is within the scope of the disclosure. Steps S701 to S703 are as follows.

Step S701: each of the plurality of second stations S1-S12 sending an uplink test signal to the first station MS;

step S702: the first machine MS generates an uplink path power attenuation amount corresponding to each second machine according to the signal strength of the uplink test signal;

step S703: each second machine generates uplink compensation gain according to the uplink path power attenuation amount.

The details and principles of steps S701 to S703 are described above, and thus will not be described herein again. Steps S701 to S703 may be regarded as the distributed communication system 100 during the testing phase of the uplink communication, in order to generate the uplink compensation gain corresponding to the uplink path of each second station. After the distributed communication system 100 performs steps S701 to S703, the uplink compensation gain corresponding to each second apparatus can be generated. The distributed communication system 100 can then continuously transmit uplink signals using the uplink compensation gain, as described below.

Fig. 7B is a flowchart of a signal transmission phase of a distributed communication method for performing uplink communication in the distributed communication system 100. The flow of the signal transmission phase of the distributed communication method of uplink communication includes steps S704 to S707. Any reasonable variation of the content of steps or sequence of steps is within the scope of the disclosure. Steps S704 to S707 are as follows.

Step S704: a plurality of second stations S1-S12 receiving a plurality of uplink signals;

step S705: each of the second stations S1-S12 adjusting a corresponding one of the uplink signals by an uplink compensation gain to produce a compensated uplink signal;

step S706: each second machine station transmits the compensated uplink signal to the first machine station MS;

step S707: the first station MS transmits the compensated uplink signal to the base station BS.

The details and principles of steps S704 through S707 have been described above, and thus will not be described herein. Steps S704 to S707 may be regarded as the distributed communication system 100 during the signal transmission phase of the uplink communication, and each second apparatus may compensate the uplink signal according to the uplink compensation gain generated in the test phase shown in fig. 7A. When each second station adjusts the uplink signal by the corresponding uplink compensation gain, the power levels of the compensated uplink signals received by the first station MS are substantially the same. Therefore, the user equipment can enjoy good uplink communication quality regardless of the location.

The distributed communication system 100 includes a test phase as shown in fig. 7A and a signal transmission phase as shown in fig. 7B in uplink communication. After the distributed communication system 100 completes the testing phase by using the process of fig. 7A and obtains the uplink compensation gain of each second station, the uplink signal transmission can be continuously performed according to the process of fig. 7B.

In summary, the present invention describes a distributed communication system including a first machine wirelessly linked with a base station and a plurality of second machines. The first machine and the second machine can form a plurality of symmetrical relay systems. The second machines can be distributively arranged at different positions, such as positions needing signal enhancement in a building. A distributed communication system may perform uplink communications as well as downlink communications. In uplink communication, each of the second stations compensates the uplink signal to generate a compensated uplink signal, so that the power levels of the compensated uplink signals transmitted to the base station by the first station are substantially the same. During downlink communication, the second apparatus compensates the received downlink signals respectively, so that the power levels of the compensated downlink signals generated by the second apparatus are substantially the same. Therefore, the position of the user device is virtually moved to a position close to the first machine. In other words, the equivalent radio channel path between the location of the ue and the base station is the path between the first apparatus and the base station, regardless of uplink communication or downlink communication. As long as the quality of the wireless channel between the first machine and the base station is good, the communication quality of any place in the whole building can be guaranteed to be good. Therefore, the distributed communication system is applied to buildings, and can achieve high-reliability communication quality with almost no dead angle.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Description of the symbols

100 distributed communication system

BS base station

MS first machine

C1-C8 coupling device

Second machine from S1 to S12

Range of R signal

UE, UE 1-UE 4 user equipment

DLP downlink test signal

DPL1 downlink path

UE1 'to UE 4' positions

ULP uplink test signal

UPL1 uplink path

S601 to S607 Steps

S701 to S707

Claims

1. A distributed communication method, comprising:

a first station broadcasting a downlink test signal;

each second machine of the plurality of second machines receives the downlink test signal;

each second machine station generates a downlink path power attenuation amount according to a signal strength of the downlink test signal;

each second machine station generates a downlink compensation gain according to the downlink path power attenuation amount;

the first station receiving a downlink signal of a base station;

the first machine station broadcasts the downlink signal;

each second machine receives the downlink signal and adjusts the downlink signal by the downlink compensation gain to generate a compensated downlink signal;

wherein the power levels of the compensated downlink signals generated by the second stage are substantially the same.

2. The method of claim 1 wherein each second stage generates the downlink compensation gain according to the downlink path power attenuation if the downlink path power attenuation is less than a predetermined value.

3. The method of claim 1, further comprising:

if the downlink path power attenuation is greater than a predetermined value, a warning signal is generated.

4. The method of claim 1, further comprising:

the first station amplifies the downlink signal with a downlink power gain.

5. The method of claim 1, wherein the first and second machines form a plurality of symmetric relay systems, each second machine being linked to at least one UE for transmitting the compensated downlink signal generated by the each second machine to the at least one UE.

6. The method of claim 3, wherein the predetermined value is a predetermined transmission path attenuation corresponding to a farthest second machine of the first and second machines.

7. The method of claim 1, wherein the first tool and the second tool are wired through a plurality of coupling devices having a tree topology, and the coupling devices have a directional transmission function.

8. The method of claim 1, further comprising:

the first machine and each second machine of the second machines carry out signal synchronization between the two machines by a time signal.

9. A distributed communication method, comprising:

each second machine of the plurality of second machines sends an uplink test signal to a first machine;

the first machine station generates an uplink path power attenuation amount according to the signal strength of the uplink test signal;

generating an uplink compensation gain by each second machine according to the uplink path power attenuation;

the second machines receive uplink signals;

each second machine adjusts the corresponding uplink signal in the uplink signals by the uplink compensation gain to generate compensated uplink signals;

each second machine transmits the compensated uplink signal to the first machine; and

the first machine transmits the compensated uplink signal to a base station;

wherein the power levels of the corresponding compensated uplink signals of the second machines are substantially the same.

10. The method of claim 9 wherein each second machine generates the uplink compensation gain according to the uplink path power attenuation if the uplink path power attenuation is smaller than a predetermined value.

11. The method of claim 9, further comprising:

if the uplink path power attenuation is greater than a predetermined value, an alarm signal is generated.

12. The method of claim 9, wherein the first machine transmits the compensated uplink signal to the base station after receiving the compensated uplink signal corresponding to each second machine, and the compensated uplink signal is amplified by an uplink power gain and then transmitted to the base station.

13. The method of claim 9, wherein the first and second machines form a plurality of symmetric relay systems, each second machine being linked to at least one UE for receiving uplink signals generated by the at least one UE.

14. The method of claim 11, wherein the predetermined value is a predetermined transmission path attenuation corresponding to a farthest second machine of the first and second machines.

15. The method of claim 9, wherein the first tool and the second tool are wired through a plurality of coupling devices having a tree topology, and the coupling devices have a directional transmission function.

16. The method of claim 9, further comprising: