A method and device for suppressing bottom noise interference of multi-system uplink in an indoor distribution system

Abstract

The application discloses a kind of multi-system uplink bottom noise interference suppression method and device of indoor distribution system.Method for execution in remote unit and extension unit, the following steps are executed in remote unit: S101, receive the downlink signal sent by extension unit;S102, coupling downlink signal to synchronization module, and detecting and analyzing downlink signal, obtain downlink signal strength, operator information and cell ID;S103, downlink signal strength, operator information and cell ID are reported to extension unit;S104, accept the gain adjustment instruction sent by extension unit;S105, receive the gain adjustment instruction, and adjust link gain by variable gain module in uplink and downlink.The application accurately reduces uplink bottom noise and will not cause influence to other system uplink index, realizes multi-system uplink bottom noise interference suppression, and digital signal processing workload is small, and hardware design difficulty is low.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and more specifically, to a method and apparatus for suppressing uplink noise floor interference in an indoor distributed system. Background Technology

[0002] With the continuous development of mobile communication technology, high capacity and wide coverage have become the main requirements and evolutionary trends of mobile communication networks. Indoor distribution systems are a typical application and main coverage method for the development of mobile communication networks towards breadth and depth. With the coexistence and co-location of multiple operators, the phenomenon of multi-standard and multi-frequency band hybrid networking is becoming increasingly common. Typical networking methods include a combination of star and chain topologies. Indoor distribution systems also need to support multiple frequency bands and standards simultaneously. The diversity of frequency bands and standards is mainly reflected in the remote units, with the extension units responsible for the distribution and aggregation of uplink and downlink signals from multiple systems. During uplink communication, the extension units combine and superimpose uplink signals from multiple remote units before transmitting them to the BBU. In the entire system, the noise floor also increases when signals are superimposed between remote units and extension units, causing the overall system noise floor to rise. This is a significant factor in degraded communication performance. At best, it affects call quality and reduces uplink and downlink data transmission rates; at worst, it completely overwhelms service data, completely interrupting the wireless signal in the affected area, impacting the entire communication system.

[0003] In existing technologies, there are three main ways to reduce uplink noise floor interference in a system: First, reduce the noise figure of the uplink link of the remote unit to minimize the uplink output noise floor. This is already considered in the hardware design process, leaving little room for optimization. Second, distinguish between noise and signal transmitted in the digital domain; if it is noise, it is not transmitted. This involves a large workload in digital signal processing and high hardware requirements. Third, reduce the link gain of the extension unit according to the number of remote units to offset the increase in system noise floor caused by the superposition of remote units. However, this method is only suitable for single-operator, single-cell scenarios. Reducing the gain of the extension unit will reduce the uplink noise floor of the system itself, but it will worsen the uplink performance of other systems with fewer remote units. It is not suitable for multi-operator, multi-system scenarios. Therefore, suppressing uplink noise floor interference in indoor distributed systems has become a challenge. Summary of the Invention

[0004] The purpose of this invention is to provide a method and apparatus for suppressing uplink noise interference in indoor distributed systems, so as to overcome the defects of the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A method for suppressing uplink noise floor interference in an indoor distributed system, used in remote units and extension units, is characterized by:

[0007] The following steps are performed in the remote unit:

[0008] S101, Receive downlink signal sent by extension unit;

[0009] S102, Couple the downlink signal to the synchronization module, and detect and parse the downlink signal to obtain the downlink signal strength, operator information and cell ID;

[0010] S103. Report the downlink signal strength, operator information, and cell ID to the extension unit;

[0011] S104. Receive the gain adjustment command sent by the expansion unit;

[0012] S105. Receive the gain adjustment command and adjust the link gain through the variable gain module in the uplink and downlink.

[0013] The following steps are performed in the expansion unit:

[0014] S201, Receive downlink signal strength, operator information and cell ID reported by the remote unit;

[0015] S202. Count the number of remote units with the same cell ID from the same operator;

[0016] S203. Determine whether the number of remote units exceeds the set upper limit;

[0017] S204. If the signal strength exceeds the set upper limit, a command is sent to the remote unit whose signal strength exceeds the preset upper limit to reduce its uplink and downlink gain.

[0018] S205. If the set upper limit value is not exceeded, a command is sent to increase the uplink and downlink gain of each remote unit in the cell to the maximum gain.

[0019] The present invention also provides an apparatus for implementing the above-described method for suppressing uplink noise floor interference in a multi-system indoor distributed system, characterized in that it comprises:

[0020] The synchronization module is used to detect and parse downlink signals to obtain downlink signal strength, operator information, and cell ID;

[0021] An interactive communication module is used for information exchange between remote units and extension units;

[0022] The statistics module is used to summarize and statistically analyze the parsed information received by the interactive communication module.

[0023] The control module is used to determine the number of statistics collected by the statistics module. If the number of remote units in the same cell of the same operator exceeds the preset limit, a gain adjustment command is sent to reduce the gain of remote units whose signal strength exceeds the preset limit. If the number of remote units in the same cell of the same operator does not exceed the preset limit, a gain adjustment command is sent to increase the gain of remote units in that cell to the maximum gain.

[0024] The remote control module is used to generate adjustment signals based on gain adjustment commands;

[0025] Variable gain module, used for link gain adjustment;

[0026] The synchronization module, statistics module, control module, and remote control module are all connected to the interactive communication module.

[0027] Furthermore, the interactive communication module includes two modules, one located within the expansion unit and the other within the remote unit. The interactive communication module located within the expansion unit is used to report the parsed information to the expansion unit and receive the gain adjustment command sent by the expansion unit. The interactive communication module located within the remote unit is used to receive the parsed information reported by the remote unit and send the gain adjustment command to the remote unit to adjust the gain.

[0028] Furthermore, the variable gain module includes an uplink variable gain module and a downlink variable gain module.

[0029] Furthermore, the synchronization module, remote control module, and variable gain module are located within the remote unit, while the statistics module and control module are located within the expansion unit.

[0030] Compared with existing technologies, the advantages of this invention are as follows: In this invention, remote units detect and analyze downlink signals through their respective synchronization module units, determine the current physical cell, operator, and signal strength, and report this information to the statistics module of the extension unit. If the number of remote units in the same physical cell of the same operator exceeds a preset limit, an instruction is issued to reduce the uplink and downlink gains of remote units whose signal strength in this cell exceeds a preset threshold, thereby reducing their uplink output noise floor and achieving uplink noise floor interference suppression for the entire system. The gains of remote units belonging to other cell IDs are not adjusted, thus not affecting the normal operation of equipment belonging to other cells. This method accurately reduces uplink noise floor without affecting the uplink indicators of other systems, achieving uplink noise floor interference suppression for multiple systems. The digital signal processing workload is small, and the hardware design difficulty is low. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a flowchart of the method for suppressing uplink noise floor interference in an indoor distribution system according to the present invention.

[0033] Figure 2 This is a schematic diagram of the expansion unit process in this invention.

[0034] Figure 3 This is a schematic diagram of the multi-system uplink noise floor interference suppression device for indoor distribution systems of the present invention. Detailed Implementation

[0035] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0036] See Figure 1 As shown, this embodiment discloses a method for suppressing uplink noise floor interference in an indoor distributed system, which is used to perform in remote units and extension units.

[0037] like Figure 1 As shown, the remote unit performs the following steps:

[0038] Step S101: Receive the downlink signal sent by the extension unit.

[0039] Step S102: Couple the downlink signal to the synchronization module, and detect and parse the downlink signal to obtain the downlink signal strength, operator information and cell ID.

[0040] Step S103: Report the downlink signal strength, operator information, and cell ID to the extension unit.

[0041] Step S104: Receive the gain adjustment command sent by the expansion unit.

[0042] Step S105: Receive the gain adjustment command and adjust the link gain through the variable gain module in the uplink and downlink. According to the uplink noise floor calculation formula: Noise Floor = -174 + 10log(BW) + GAIN + NF, the smaller the uplink gain, the lower the output noise floor, thereby achieving the purpose of suppressing uplink noise floor interference. It is important to note that a decrease in link gain may also increase NF; therefore, the variable gain module should be placed at the back end of the uplink, where a decrease in gain has little impact on NF.

[0043] like Figure 2 As shown, the following steps are performed in the expansion unit:

[0044] Step S201: Receive downlink signal strength, operator information, and cell ID reported by the remote unit.

[0045] Step S202: Count the number of remote units with the same cell ID from the same operator.

[0046] Step S203: Determine whether the number of remote units exceeds the set upper limit.

[0047] Step S204: If the signal strength exceeds the set upper limit, a command is sent to the remote unit whose signal strength exceeds the preset upper limit to reduce its uplink and downlink gain.

[0048] Step S205: If the set upper limit value is not exceeded, send an instruction to release the uplink and downlink gain of each remote unit in the cell to the maximum gain.

[0049] In this embodiment, the remote units detect and analyze the downlink signal through their respective synchronization module units, determine the current physical cell, operator, and signal strength, and report to the statistics module of the extension unit. If the number of remote units in the same physical cell of the same operator exceeds a preset limit, an instruction is issued to reduce the uplink and downlink gains of remote units whose signal strength in this cell exceeds a preset threshold, thereby reducing their uplink output noise floor and suppressing uplink noise interference for the entire system. The gains of remote units belonging to other cell IDs are not adjusted, so as not to affect the normal operation of equipment belonging to other cells. The method of this embodiment accurately reduces uplink noise floor without affecting the uplink indicators of other systems, realizing uplink noise interference suppression for multiple systems, with low digital signal processing workload and low hardware design difficulty.

[0050] See Figure 3 As shown, the present invention also provides an apparatus for implementing the above-described method for suppressing uplink noise floor interference in multi-system indoor distributed systems, characterized in that it comprises:

[0051] Synchronization module 301, located in the remote unit, is used to detect and parse downlink signals to obtain downlink signal strength, operator information, and cell ID.

[0052] The interactive communication module 302 is used for information exchange between the remote unit and the extension unit.

[0053] Specifically, the interactive communication module 302 includes two modules, one located in the expansion unit and the other located in the remote unit. The interactive communication module 302 located in the expansion unit is used to report the parsed information to the expansion unit and receive the gain adjustment command sent by the expansion unit. The interactive communication module 302 located in the remote unit is used to receive the parsed information reported by the remote unit and send the gain adjustment command to the remote unit to adjust the gain.

[0054] The statistics module 303, located in the extension unit, is used to summarize and statistically analyze the parsed information received by the interactive communication module.

[0055] The control module 304, located in the expansion unit, is used to determine the number of statistics by the statistics module 303. If the number of remote units in the same cell of the same operator exceeds the preset limit, a gain adjustment command is sent to reduce the gain of remote units whose signal strength exceeds the preset limit. If the number of remote units in the same cell of the same operator does not exceed the preset limit, a gain adjustment command is sent to increase the gain of remote units in that cell to the maximum gain.

[0056] The remote control module 305, located in the remote unit, is used to generate adjustment signals according to gain adjustment instructions.

[0057] The variable gain module, located in the remote unit, is used to adjust the link gain. The variable gain module includes an uplink variable gain module 306 and a downlink variable gain module 307.

[0058] The synchronization module 301, statistics module 303, control module 304 and remote control module 305 are all connected to the interactive communication module 302.

[0059] The digital signal processing of this invention has low computational load, simple hardware design, and is suitable for multi-system operation scenarios in indoor distributed systems.

[0060] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, the patent owner may make various modifications or alterations within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the present invention, they shall be within the protection scope of the present invention.

Claims

1. A method for suppressing uplink noise floor interference in an indoor distributed system, used in remote units and extension units, characterized in that, The following steps are performed in the remote unit: S101, Receive downlink signal sent by extension unit; S102, Couple the downlink signal to the synchronization module, and detect and parse the downlink signal to obtain the downlink signal strength, operator information and cell ID; S103. Report the downlink signal strength, operator information, and cell ID to the extension unit; S104. Receive the gain adjustment command sent by the expansion unit; S105. Receive the gain adjustment command and adjust the link gain through the variable gain module in the uplink and downlink; The following steps are performed in the expansion unit: S201, Receive downlink signal strength, operator information and cell ID reported by the remote unit; S202. Count the number of remote units with the same cell ID from the same operator; S203. Determine whether the number of remote units exceeds the set upper limit; S204. If the signal strength exceeds the set upper limit, a command is sent to the remote unit whose signal strength exceeds the preset upper limit to reduce its uplink and downlink gain. S205. If the set upper limit value is not exceeded, send an instruction to open the uplink and downlink gain of each remote unit in the cell to the maximum gain. The remote units detect and analyze the downlink signal through their respective synchronization module units, determine the current physical cell, operator, and signal strength, and report to the statistics module of the extension unit. If the number of remote units in the same physical cell of the same operator exceeds the preset limit, an instruction is issued to reduce the uplink and downlink gain of remote units whose signal strength in this cell exceeds the preset threshold, while the uplink and downlink gain of remote units belonging to other cell IDs are not adjusted.

2. An apparatus for implementing the method for suppressing uplink noise floor interference in an indoor distributed system as described in claim 1, characterized in that, include: The synchronization module is used to detect and parse downlink signals to obtain downlink signal strength, operator information, and cell ID; An interactive communication module is used for information exchange between remote units and extension units; The statistics module is used to summarize and statistically analyze the parsed information received by the interactive communication module. The control module is used to determine the number of statistics collected by the statistics module. If the number of remote units in the same cell of the same operator exceeds the preset limit, a gain adjustment command is sent to reduce the uplink and downlink gain of the remote units whose signal strength exceeds the preset limit. If the number of remote units in the same cell of the same operator does not exceed the preset limit, a gain adjustment command is sent to increase the uplink and downlink gain of the remote units in that cell to the maximum gain. The remote control module is used to generate adjustment signals based on gain adjustment commands; Variable gain module, used for link gain adjustment; The synchronization module, statistics module, control module, and remote control module are all connected to the interactive communication module.

3. The apparatus according to claim 2, characterized in that, The interactive communication module includes two modules, one located within the expansion unit and the other within the remote unit. The interactive communication module located within the expansion unit is used to report the parsed information to the expansion unit and receive the gain adjustment command sent by the expansion unit. The interactive communication module located within the remote unit is used to receive the parsed information reported by the remote unit and send the gain adjustment command to the remote unit to adjust the gain.

4. The apparatus according to claim 2, characterized in that, The variable gain module includes an uplink variable gain module and a downlink variable gain module.

5. The apparatus according to claim 2, characterized in that, The synchronization module, remote control module, and variable gain module are located in the remote unit, while the statistics module and control module are located in the expansion unit.

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