Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B17/00—Monitoring; Testing
  • H04B17/10—Monitoring; Testing of transmitters
  • H04B17/11—Monitoring; Testing of transmitters for calibration

Definitions

• the present invention relates to antenna parameter adjustment techniques, and in particular, to a coexistence-based cognitive radio system antenna parameter adjustment method and apparatus. Background technique
• While the secondary system is waiting to borrow the main system spectrum resources to improve the overall performance of the network, it must also guarantee the quality of service of the primary system. If the technology is used to control the range and time of spectrum borrowing, such as reliable power control mechanism and main user discovery, it is guaranteed not to cause interference to the main system.
• the primary user to which the secondary system occupies the spectrum reappears, that is, when the primary user re-uses the spectrum resources originally borrowed for the secondary system, in order to strictly ensure that the secondary system does not cause harmful interference to the primary user, the secondary system The use of this segment of the spectrum will be withdrawn, and the secondary system will re-find the available idle spectrum resources or return the authorized frequency of the secondary system to continue to provide service services to the terminal.
• the communication link between the base station and the relay node is established by using the TVWS resource.
• the signal transmitted by the base station to the relay node covers the entire fan. Zone, and the relay node is not full of sectors.
• the secondary system uses TVWS (ie, the secondary system is on the TVWS).
• the coverage of the transmitted information is greater than the coverage it actually needs. This coverage will affect the communication quality of other systems in the relevant area.
• FIG. 1 is a schematic diagram of a network architecture of an existing cognitive technology-based IMT system.
• the existing network architecture of an IMT system based on cognitive technology has two structures, as shown in FIG. 1 . (a), as shown in Figure 1 (b), the difference between the two structures is only that the reconfiguration decision module is set at the reconfigurable base station or independent of the reconfigurable base station, as shown in Figure 1 based on cognitive technology.
• the network architecture of the IMT system includes:
• a database which may be a standard geographic location information database (DB, Geo-location Data Base) 0 containing information about the primary system idle frequency resource (TVWS).
• DB Geo-location Data Base
• TVWS primary system idle frequency resource
• the reconfiguration decision module which may be a physical or logic module with a frequency resource allocation decision capability, such as a central control point (CCP) or a reconfiguration entity (RE, Reconfiguration Entity), which may be located at a reconfigurable base station ( RBS, Reconfigurable Base Station)
• CCP central control point
• RE reconfiguration entity
• RBS reconfigurable Base Station
• the network element in the upper layer can also be located in the RBS. It has the following functions (when the reconfiguration decision module is located in the base station, the interaction process described below is implemented by the base station internal primitive):
• WS White Space frequency resource requests from each RBS, accessing the geographic location information database to obtain WS spectrum information; 2. including subordinate base station (BS, Base Station) frequency usage information, will be obtained
• the WS resources are coordinated and allocated to the subordinate BSs.
• the resource reconfiguration decision is made, the spectrum resource reconfiguration command is generated, sent to the relevant BS, and controlled to perform corresponding reconfiguration.
• Reconfigurable base station RBS whose functions include but are not limited to: 1. Allocating the obtained WS spectrum resources to each wireless link connected thereto; 2. Changing or adjusting parameters of the wireless communication technology, for example, modulation type, antenna transmission parameters 3. Manage and maintain the working spectrum, for example, the working frequency and frequency band; 4. Spectrum sensing function; 5. Perceive data processing capability; 6. Deliver reconfiguration commands to subordinate related UEs or APs, and control their reconfiguration .
• An access point may be a network node such as a Relay node, which is connected to the BS as a backhaul link. Its functions include but are not limited to: 1. Change or adjust wireless communication technical parameters, such as modulation type, transmit power; 2. Manage and maintain working frequency spectrum, for example, working frequency and frequency band; 3. Spectrum sensing function.
• UE User Equipment
• the UE under the cognitive radio system has the ability to change operating parameters, such as changing the operating frequency, modulation type, and the like. Summary of the invention
• the main object of the present invention is to provide a coexistence-based cognitive radio system antenna parameter adjustment method and apparatus, which can adaptively adjust a base station of a cognitive radio system while ensuring coexistence of a primary system and a secondary system.
• Antenna emission parameters are provided.
• a method for adjusting antenna parameters of a cognitive radio system based on coexistence comprising:
• the secondary system satisfies the coexistence requirement as:
• the secondary system meets its own coverage requirements, and/or the secondary system and the primary system satisfy coexistence requirements, and/or meet coexistence requirements between the secondary systems, and/or meet energy conservation requirements.
• the secondary system satisfies its own coverage requirement: the secondary system satisfies the requirement of completely covering the area where the user served by the secondary system is located;
• the secondary system and the primary system satisfy a coexistence requirement: a transmission letter of the secondary system The number does not cause interference to the users of the primary system;
• the coexistence requirements are met between the secondary systems: the transmitted signals between the secondary systems do not cause interference to each other;
• the meeting the energy saving requirement is: satisfying the requirement of the secondary system coverage with the lowest transmission power.
• the information for determining that the secondary system meets the coverage requirement of the coexistence requirement comprises: usage information of the primary system for the idle spectrum resource, and/or overlapping or adjacent to the secondary system coverage The secondary system's usage information for the idle spectrum resource, and/or the secondary system's own coverage requirement information.
• the usage information of the idle spectrum resource includes at least one of the following information:
• the coverage of the idle spectrum, the guard band information, and the interference tolerance threshold is the coverage of the idle spectrum, the guard band information, and the interference tolerance threshold.
• the method further includes:
• the determining that the secondary system meets the coverage requirement of the coexistence requirement comprises: determining, according to the coverage of the idle spectrum and the protection band information of the primary system, the idle spectrum except the primary system Coverage and other areas outside the protection zone are the coverage of the secondary system that meets the coexistence requirements;
• the coverage of the secondary system is determined based on energy saving requirements.
• the transmission parameter of the antenna includes at least one of the following parameters: Antenna transmit power, antenna azimuth, antenna pitch angle, antenna height, main lobe direction of the antenna, horizontal lobe width of the antenna, vertical lobe width, polarization mode.
• determining or adjusting the transmission parameters of the secondary system antenna according to the coverage includes:
• Determining or adjusting a transmission parameter of an associated antenna in the secondary system when the coverage of the transmit signal of the secondary system antenna overlaps the coverage of the transmit signal of the primary system antenna, such that the secondary system antenna The coverage of the transmitted signal no longer overlaps the coverage of the transmitted signal of the primary system antenna;
• the transmission parameters of the host base station antenna are determined or adjusted such that the transmit signal of the host base station covers all working relay nodes.
• determining or adjusting the transmission parameters of the secondary system antenna is:
• the transmission parameters of the relevant antennas in the secondary system are directly adjusted.
• the transmission parameter reconfiguration command sent to the secondary system is a control command generated after performing an antenna transmission parameter reconfiguration decision, and is used to guide the secondary system to perform a specified reconfiguration operation; wherein the antenna
• the transmission parameters include at least one of the following parameters: a reconfigured target spectrum, and an antenna's transmission parameter configuration information.
• An antenna parameter adjustment device based on coexistence cognitive radio system including reconfiguration decision mode Block and send module, where:
• a reconfiguration decision module configured to obtain information for determining a coverage range in which the secondary system satisfies the coexistence requirement
• a sending module configured to send a transmit parameter reconfiguration command to the secondary system.
• the secondary system satisfies the coexistence requirement as:
• the secondary system meets its own coverage requirements, and/or the secondary system and the primary system satisfy coexistence requirements, and/or meet coexistence requirements between the secondary systems, and/or meet energy conservation requirements.
• the secondary system satisfies its own coverage requirement: the secondary system satisfies the requirement of completely covering the area where the user served by the secondary system is located;
• the secondary system and the primary system satisfy the coexistence requirement: the transmission signal of the secondary system does not cause interference to users of the primary system;
• the coexistence requirements are met between the secondary systems: the transmitted signals between the secondary systems do not cause interference to each other;
• the meeting the energy saving requirement is: satisfying the requirement of the secondary system coverage with the lowest transmission power.
• the information obtained by the reconfiguration decision module includes:
• the level system itself covers the demand information.
• the usage information of the idle spectrum resource includes at least one of the following information:
• the coverage of the idle spectrum, the guard band information, and the interference tolerance threshold is the coverage of the idle spectrum, the guard band information, and the interference tolerance threshold.
• the reconfiguration decision module is further configured to: determine that the secondary system meets a coverage requirement of the coexistence requirement, determine or adjust a transmission parameter of the secondary system antenna according to the coverage, and generate a transmission parameter reconfiguration command. .
• the reconfiguration decision module is further configured to: according to the idle frequency of the primary system The coverage of the spectrum and the protection band information, determining that the coverage of the idle spectrum of the primary system and other areas outside the protection band are the coverage of the secondary system that meets the coexistence requirement; or, according to the adjacent time The coverage of the idle spectrum and the guard band information of the level system, determining that the coverage of the idle spectrum and the other areas except the guard band of the adjacent secondary system are the coexistence requirements of the secondary system Coverage
• the coverage of the secondary system is determined based on energy saving requirements.
• the transmission parameter of the antenna includes at least one of the following parameters:
• Antenna transmit power, antenna azimuth, antenna pitch angle, antenna height, main lobe direction of the antenna, horizontal lobe width of the antenna, vertical lobe width, polarization mode.
• the reconfiguration decision module is further configured to: determine or adjust a correlation in the secondary system when a coverage of a transmit signal of the secondary system antenna overlaps a coverage of a transmit signal of the primary system antenna
• the transmission parameter of the antenna is such that the coverage of the transmission signal of the secondary system antenna no longer overlaps with the coverage of the transmission signal of the primary system antenna;
• the transmission parameters of the host base station antenna are determined or adjusted such that the transmit signal of the host base station covers all working relay nodes.
• the reconfiguration decision module is further configured to: when the transmitting antenna is in a non-working state in the secondary system, determine a transmitting parameter of an associated antenna in the secondary system and notify a network element to which the associated antenna belongs; When the transmitting antenna is in an active state in the secondary system, the transmission parameters of the associated antennas in the secondary system are directly adjusted.
• the transmission parameter reconfiguration command sent to the secondary system is a control command generated after performing an antenna transmission parameter reconfiguration decision, and is used to guide the secondary system to perform a specified reconfiguration operation; wherein the antenna
• the transmission parameters include at least one of the following parameters: a reconfigured target spectrum, and an antenna's transmission parameter configuration information.
• the secondary system when the secondary system uses the primary system idle spectrum resource, it determines that the secondary system satisfies the coverage requirement of the coexistence requirement; determines or adjusts the transmission parameters of the secondary system antenna according to the coverage range and performs adjustment.
• the transmitting antenna in the secondary system when the transmitting antenna in the secondary system is in a non-working state, determining the transmitting parameters of the relevant antennas in the secondary system and notifying the network element to which the associated antenna belongs; when the transmitting antenna in the secondary system is in the working state, in the secondary system The transmission parameters of the relevant antenna are directly adjusted.
• the present invention adaptively determines the base station antenna transmission parameters of the cognitive radio system by determining the coverage requirements of the primary system and the secondary system, and adjusts accordingly.
• the invention improves the spectrum utilization rate and solves the frequency interference problem that may exist in the coexistence of the primary system and the secondary system in the cognitive radio system; by adjusting the antenna parameters, the coverage of the relevant base station is controlled, and the additional Inter-system interference caused by coverage.
• FIG. 1( a ) and ( b ) are schematic diagrams of a network architecture of an existing cognitive technology-based IMT system
• FIG. 2 is a flowchart of a method for adjusting antenna parameters of a cognitive radio system based on coexistence
• FIG. 3 is an embodiment of the present invention
• FIG. 4 is a schematic flowchart of a method for adjusting antenna parameters of a cognitive radio system based on coexistence according to Embodiment 1 of the present invention
• Embodiment 2 of the present invention is a schematic structural diagram of coexistence between secondary systems according to Embodiment 2 of the present invention.
• FIG. 6 is a flowchart of a method for adjusting antenna parameters of a cognitive radio system based on coexistence according to Embodiment 2 of the present invention
• FIG. 7 is a schematic structural diagram of a coverage change of a secondary system according to a third embodiment of the present invention
• FIG. 8 is a flowchart of a method for adjusting antenna parameters of a cognitive radio system based on coexistence according to Embodiment 3 of the present invention
• FIG. 9 is a schematic structural diagram of a change in coverage requirements of a secondary system according to Embodiment 4 of the present invention.
• FIG. 10 is a flowchart of a method for adjusting antenna parameters of a cognitive radio system based on coexistence according to Embodiment 4 of the present invention;
• FIG. 11 is a schematic structural diagram of performing user centralized area coverage according to Embodiment 5 of the present invention
• FIG. 12 is a flowchart of a method for adjusting antenna parameters of a cognitive radio system based on coexistence according to Embodiment 5 of the present invention
• FIG. 13 is a schematic structural diagram of a structure of an antenna parameter adjustment apparatus based on a coexistence cognitive radio system according to an embodiment of the present invention. detailed description
• the present invention utilizes the reconfiguration decision module of the secondary system in the existing standard to complete the antenna transmission parameter determination and adjustment, and delivers the reconfigurable base station to perform the specified reconfiguration, as shown in (a) and (b) of FIG.
• the reconfiguration decision module may be located in a reconfigurable base station or in a node above the reconfigurable base station. In the present invention, the reconfiguration decision module is located in the upper node of the base station as an example. For the case where the reconfiguration decision module is located in the reconfigurable base station, it can be understood that the interaction between the reconfiguration decision module and the base station in the subordinate process passes through the internal base station. Language implementation. Where the reconfiguration decision module is located does not affect the implementation manner and implementation effect of the technical solution of the present invention.
• 2 is a flowchart of a method for adjusting antenna parameters of a cognitive radio system based on coexistence. As shown in FIG. 2, the method for adjusting antenna parameters of a cognitive radio system based on coexistence includes the following steps:
• Step 201 information acquisition
• the secondary system needs to obtain the phase according to the system requirements before making the spectrum resource reconfiguration decision.
• Information used to assess coexistence-based coverage needs, which may be one or more of the following: Information about the use of the re-matched target spectrum by the relevant secondary system: including but not limited to coverage, protection band information, tolerance Interference thresholds, etc.
• a related secondary system herein refers to a secondary system that overlaps or is adjacent to the secondary system.
• the reconfiguration target spectrum refers to the spectrum resources that the secondary system is expected to reconfigure.
• the primary system refers to a system that is authorized to operate on the frequency band, such as for TVWS spectrum resources, whose primary system is an authorized low power system of a television system or wireless microphone.
• Self-coverage requirements Refers to the coverage of the secondary system's desired re-matched target spectrum resources.
• Step 202 Perform a coverage requirement assessment based on the coexistence according to the obtained information.
• a coverage range of the TVWS acquired by the secondary system may be obtained, and the coverage may be the final coverage. Or further combine this range with the need for energy savings to determine the final coverage.
• the above-mentioned coexistence-based coverage requirements can be considered separately as a condition, or combined into a comprehensive condition for consideration.
• the acquired TVWS only needs to consider no interference to the primary user.
• the secondary system is available when there is no interference with the primary user.
• TVWS coverage For example, when the system requires comprehensive consideration of the coexistence requirements of the main system and the coexistence requirements of the secondary systems, the available coverage ranges under the two conditions are separately evaluated, and the intersections are taken to obtain the final coverage.
• Step 203 Determine or adjust an antenna transmission parameter.
• the reconfiguration decision module determines or adjusts the antenna transmission according to the wireless environment, the transmission model, and the previously acquired interference tolerance threshold. Parameters.
• the transmitting antenna in the secondary system when the transmitting antenna in the secondary system is in a non-operating state, since the transmission parameters of the relevant antennas in the secondary system cannot be adjusted at this time, only the transmitting parameters of the relevant antennas in the secondary system are determined and notified.
• the relevant antenna belongs to the network element.
• the relevant antenna works, the related parameters of the transmitting antenna are adjusted by the network element to which it belongs.
• the relevant antenna in the secondary system is transmitted. The parameters are adjusted directly.
• the antenna transmission parameters include, but are not limited to, transmit power, antenna azimuth, antenna pitch angle, vertical/horizontal lobe direction of the antenna, polarization mode, and the like. These parameters are adjusted to achieve the required coverage to meet the coexistence-based coverage requirements.
• Step 204 The reconfiguration decision module sends a reconfiguration command to refer to the reconfigurable base station.
• the reconfiguration command refers to a control command generated after the reconfiguration decision module performs a reconfiguration decision, and is used to guide the reconfigurable base station to perform a specified reconfiguration operation.
• the parameters include but are not limited to: the reconfigured target spectrum, the reconfiguration time, and the antenna transmission parameters described above.
• the re-matching target spectrum refers to the method in which the reconfiguration decision module acquires the idle spectrum resource by accessing the database and the like, and is used for the opportunity to borrow the communication of the system to obtain the idle spectrum resource.
• the method belongs to the prior art, and details thereof are not described herein.
• Step 205 The reconfigurable base station performs the specified reconfiguration.
• the reconfigurable base station completes the configuration update, including the change of the spectrum resource and the change of the antenna transmission parameters.
• Step 206 After completing the specified reconfiguration, the configuration completion is fed back to the reconfiguration decision module.
• This step is an optional step.
• FIG. 3 is a schematic structural diagram of coexistence of a primary system and a secondary system according to Embodiment 1 of the present invention, as shown in FIG. 3, in the scenario of Backhaul link frequency resource reconfiguration, considering coexistence of primary and secondary systems (primary system and secondary system)
• the secondary system base station antenna transmission parameter determination process is as follows: Base station RBS The subordinate has a relay node Relay, and the Backhaul link between the RBS and the Relay is established on the TVWS spectrum resource.
• the transmitting antenna of the base station to the Relay should cover the entire sector, and the main system overlaps the sector at this time. Coverage, the use of the TVWS resource fl by the secondary system cannot be achieved.
• FIG. 4 is a flowchart of a method for adjusting antenna parameters of a cognitive radio system based on coexistence according to Embodiment 1 of the present invention. As shown in FIG. 4, the method for adjusting antenna parameters based on coexistence cognitive radio system of the present example includes the following steps:
• Step 401 Acquire usage information of the primary system for the reconfiguration target spectrum fl;
• the acquisition method can be obtained by relocating the decision module (taking the central control node CCP as an example) to access the geolocation database (Geo-location DB).
• the usage information of the main system pair re-targeting spectrum fl includes the coverage range of the spectrum fl, the guard band information, and the interference tolerance threshold information of the main system.
• the shaded circle uses the range of fl for the main system, and the outer layer is the guard band that is established for strict control to avoid interference.
• the interference tolerance threshold is the maximum interference value that can be accepted within the coverage of the main system.
• the first two can be represented by geographic location coordinates.
• Step 402 Perform coverage assessment based on coexistence of primary and secondary systems according to the obtained information.
• the usage information of the reconfiguration target spectrum fl obtained by the primary system obtained as described above can be obtained by the TVWS coverage of the secondary system, i.e., cannot overlap with the coverage of the primary system fl. Combined with the distribution of the RBS subordinate Relay, it is determined that the range covered by the TVWS of the secondary system is the coverage shown by the shaded portion of the slash in Fig. 3.
• the maximum interference of the secondary system transmitter at the coverage edge of the primary system fl is not greater than the interference tolerance threshold by limiting the transmission power.
• the process of determining the transmit power is prior art, and details of its implementation are not described herein.
• Step 404 The CCP sends the reconfiguration command to the RBS according to the antenna parameter adjustment scheme.
• Step 405 The RBS performs a specified reconfiguration with the subordinate relay to complete the configuration on the fl spectrum resource.
• the configuration process includes a change in spectrum resources, i.e., from the licensed spectrum reconfiguration to the TVWS spectrum resource fl, and the antenna transmission parameters of the RBS need to be modified as specified in the reconfiguration command described above.
• Step 406 after the specified reconfiguration is completed, the configuration of the feedback to the CCP is completed.
• This embodiment is also applicable to a scenario in which an antenna transmission parameter is determined based on a coexistence requirement between secondary systems, that is, the shadow coverage area shown in FIG. 3 is not the coverage of the target spectrum fl by the primary system, but the coverage of the other secondary system. Scope, in this case, the coverage requirements of the coexistence between the secondary systems need to be considered. In this scenario, the procedures described in the embodiments are equally applicable.
• FIG. 5 is a schematic structural diagram of coexistence between secondary systems according to Embodiment 2 of the present invention.
• the secondary system base station antenna transmits.
• the parameter adjustment process is as follows: Assume that there are three relay nodes Relay in the base station RBS, and the Backhaul link between the RBS and the Relay is established on the TVWS spectrum resource fl.
• the base station should cover the entire sector of the relay antenna (ie, The entire sector in the left figure in FIG. 5), and the overlapping coverage secondary system (the system in which RBS2 is located) overlaps with the sector at this time, and is covered by using fl, so that the secondary system cannot implement the TVWS resource fl. use.
• the coexistence-based cognitive radio system antenna parameter adjustment method of the present example includes the following steps:
• Step 601 Acquire usage information of the secondary system for the reconfiguration target spectrum fl. Interact with adjacent and overlapping overlapping CCPs to obtain information about the use of these CCPs for the reconfiguration target spectrum fl.
• the usage information of the secondary system for the reconfiguration target spectrum fl includes the coverage range of the spectrum fl, the guard band information, and the interference tolerance threshold information of the secondary system. As shown in Figure 5, the shaded sector is the range of fl used by the secondary system RBS2, and the interference tolerance threshold is the maximum acceptable interference value within the coverage of the primary system.
• Step 602 Perform, according to the obtained information, an coverage requirement assessment based on coexistence between secondary systems
• the usage information of the reconfiguration target spectrum fl by the secondary system obtained as described above can be obtained by the TVWS coverage of the secondary system RBS1, i.e., cannot overlap with the coverage of the secondary system RBS2 for fl. Combined with the distribution of the relays of RBS1, it is determined that the coverage range of the TVWS of RBS1 is the coverage shown in the arc portion of Fig. 5.
• Step 603 The CCP determines an RBS1 antenna parameter adjustment scheme according to the coverage requirement obtained by the evaluation;
• the antenna transmit power should be adjusted. Specifically, the RBS1 transmitter transmit power is reduced to the area just covering the arc, which can satisfy the RBS1 coverage of the subordinate Relay. Demand, and does not interfere with RBS2. And the determining process of the transmit power may be determined according to a wireless environment and a transmission model, for example, the RBS1 transmit power is reduced from the original 40w to 20w.
• Step 604 The CCP sends the reconfiguration command to the RBS1 according to the antenna parameter adjustment scheme.
• step 605 the RBS1 and the subordinate relay perform the specified reconfiguration to complete the configuration on the fl spectrum resource.
• the configuration process includes a change in the spectrum resource, that is, the authorized spectrum is reconfigured onto the TVWS spectrum resource fl, and the antenna transmission parameters of the RBS1 need to be modified as specified in the reconfiguration command. Step 606, after completing the specified reconfiguration, the feedback configuration to the CCP is completed.
• the above scenario is also applicable to the antenna parameter adjustment scheme between the two base stations under the CCP.
• the interaction between the CCPs is not required in the embodiment, and is implemented by the internal judgment of the CCP. Since the implementation manner is basically the same as the above process, I won't go into details here.
• FIG. 7 is a schematic structural diagram of a coverage change of a secondary system according to Embodiment 3 of the present invention.
• the secondary system base station antenna is considered when considering a change in its own coverage requirement.
• the transmission parameter adjustment process is as follows: The base station RBS belongs to the original relay node Relay 1, and the Backhaul link between the RBS and the Relay is established on the TVWS spectrum resource fl, so the main lobe direction of the RBS points to Relay 1, and the main lobe width is small. Only the coverage of Relay 1 is satisfied; another relay node Relay 2 is connected to the RBS, and the coverage of the original antenna is not covered by the coverage requirement of the antenna. Therefore, the antenna transmission parameters need to be adjusted.
• FIG. 8 is a flowchart of a method for adjusting antenna parameters of a coexistence-based cognitive radio system according to Embodiment 3 of the present invention.
• the coexistence-based cognitive radio system antenna parameter adjustment method of the present example includes the following steps:
• Step 801 the RBS and the CCP report changes in their coverage requirements
• the RBS informs that the CCP's subordinate Relay node is increased, the original resource coverage cannot meet the coverage requirement, and the location of the newly added Relay 2 is notified to the CCP;
• Step 802 Acquire usage information of the secondary system for the reconfiguration target spectrum fl;
• the usage information of the secondary system for the reconfiguration target spectrum fl includes the coverage range of the spectrum fl, the guard band information, and the interference tolerance threshold information of the secondary system.
• Step 803 Perform coverage requirement assessment based on coexistence between secondary systems according to the obtained information.
• the usage information of the reconfiguration target spectrum fl obtained by the secondary system obtained above may be obtained by the coverage of the TVWS acquired by the secondary system RBS, that is, cannot overlap with the coverage of the adjacent secondary system pair fl. From the information obtained above, it can be known that the extended coverage of the RBS does not affect the frequency usage of the relevant secondary system, that is, the transmission parameters can be adjusted according to the coverage requirements of the secondary system RBS itself.
• the TVWS spectrum resource fl cannot be the Used by the level system. Resource sharing between secondary systems is required through existing spectrum negotiation.
• TVWS frequency resources cannot be used by secondary systems.
• Step 804 the CCP determines an RBS antenna parameter adjustment scheme according to the coverage requirement obtained by the evaluation
• the original RBS antenna coverage should be adjusted.
• Step 805 The CCP sends the reconfiguration command to the RBS according to the antenna parameter adjustment scheme.
• the RBS performs the specified reconfiguration to complete the configuration on the fl spectrum resource.
• the antenna transmission parameters of the RBS in this configuration process need to be modified as specified in the above reconfiguration command.
• FIG. 9 is a schematic structural diagram of a coverage change of a secondary system according to Embodiment 4 of the present invention.
• the system base station antenna transmission parameter adjustment process is as follows: base station RBS The original two relay nodes Relay 1, Relay2, RBS and Relay Backhaul link are established on the TVWS spectrum resource fl, so the main lobe direction of the RBS points to the two Relay centers, and the main lobe width is larger to meet the two Relay's Coverage; existing relay node Relay 1 exits RBS, although the original antenna transmission parameters determine the coverage of fl to meet the coverage requirements, but because of the additional coverage, it is not conducive to coexistence, and does not meet energy-saving requirements, so Adjust the antenna transmission parameters.
• FIG. 10 is a flowchart of a method for adjusting antenna parameters of a coexistence-based cognitive radio system according to Embodiment 4 of the present invention.
• the coexistence-based cognitive radio system antenna parameter adjustment method of the present example includes the following steps:
• Step 1001 the RBS and the CCP report changes in their coverage requirements
• the RBS notifies the CCP's Relay 1 node to quit;
• Step 1002 Perform energy-based coverage requirement assessment according to the obtained information.
• the usage information of the secondary system for the reconfiguration target spectrum fl obtained by the foregoing may obtain the actual TVWS required by the secondary system RBS.
• the coverage that is, under the requirements of energy saving, meets the coverage requirements of the secondary system, and minimizes the coverage to reduce the transmission power. Therefore, the coverage requirement of the shaded portion on the right side of Fig. 9 is obtained.
• Step 1003 The CCP determines an RBS antenna parameter adjustment scheme according to the coverage requirement obtained by the evaluation;
• the original RBS antenna coverage is compared with the current coverage requirement.
• Step 1004 The CCP sends the reconfiguration command to the RBS according to the antenna parameter adjustment scheme.
• step 1005 the RBS performs the specified reconfiguration to complete the configuration on the fl spectrum resource.
• the antenna transmission parameters of the RBS in this configuration process need to be modified as specified in the above reconfiguration command.
• FIG. 11 is a schematic structural diagram of performing centralized coverage of a user according to Embodiment 5 of the present invention.
• a base station of the secondary system is considered when considering a change in coverage requirement of the secondary system itself.
• the antenna transmission parameter adjustment process is as follows: the base station RBS belongs to a user centralized area 1 , and the RBS covers the user concentrated area by using the TVWS resource fl, and uses certain antenna parameters (main lobe direction and width, azimuth, elevation angle) , transmit power, etc.) to achieve coverage.
• the user concentration area changes, the user concentration area 1 disappears, and the user concentration area 2 appears (such as a change in the user concentration area between the commercial area and the residential area during the day and night), resulting in the TVWS spectrum resource fl
• the range of coverage required varies. Therefore, the antenna transmission parameters need to be adjusted.
• FIG. 12 is a flowchart of a method for adjusting antenna parameters of a cognitive radio system based on coexistence according to Embodiment 4 of the present invention. As shown in FIG. 12, the method for adjusting antenna parameters of a cognitive radio system based on coexistence includes the following steps:
• Step 1201 the RBS and the CCP report changes in their coverage requirements
• the RBS informs the CCP of the changes in the geographical location of the user's centralized area
• Step 1202 Acquire information about usage of the reconfiguration target spectrum fl by the secondary system
• the usage information of the secondary system for the reconfiguration target spectrum fl includes the coverage of the spectrum fl by the secondary system, the protection band information, and the interference tolerance threshold information. As shown in Figure 11, the shaded sector is the range of fl used by the secondary system RBS2, and the interference tolerance threshold is the maximum acceptable within the coverage of the primary system. Interference value.
• Step 1203 Perform, according to the obtained information, a coverage assessment based on a change in secondary system coexistence and a self-coverage requirement;
• the usage information of the reconfiguration target spectrum fl by the secondary system obtained as described above can be obtained by the coverage of the TVWS acquired by the secondary system RBS1, i.e., cannot overlap with the coverage of the adjacent secondary system fl.
• the change of the user concentration area under the RBS causes the RBS1 to change the fl coverage without affecting the use of fl by the relevant secondary system RBS2. That is, the transmission parameters can be adjusted according to the coverage requirements of the secondary system RBS1 itself.
• Step 1204 the CCP determines an RBS1 antenna parameter adjustment scheme according to the coverage requirement obtained by the evaluation;
• the coverage of the original RBS antenna is compared with the current coverage requirement.
• the direction of the main lobe of the antenna should be adjusted. Specifically, the main lobe direction is adjusted counterclockwise by 50°.
• Step 1205 The CCP sends the reconfiguration command to the RBS1 according to the antenna parameter adjustment scheme.
• the RBS1 performs the specified reconfiguration to complete the configuration on the fl spectrum resource.
• the antenna transmission parameters of RBS1 in this configuration process need to be modified as specified in the above reconfiguration command.
• FIG. 13 is a schematic diagram showing the structure of a coexistence-based cognitive radio system antenna parameter adjustment apparatus according to an embodiment of the present invention.
• the coexistence-based cognitive radio system antenna parameter adjustment apparatus of the present example includes a reconfiguration decision module 1301. And sending module 1302, wherein:
• the reconfiguration decision module 1301 is configured to obtain information for determining a coverage range in which the secondary system satisfies the coexistence requirement
• the sending module 1302 is configured to send a transmit parameter reconfiguration command to the secondary system.
• the secondary system satisfies the coexistence requirement as:
• the secondary system meets its own coverage requirements, and/or the secondary system and the primary system meet coexistence requirements, and/or the secondary systems meet coexistence requirements, and/or meet energy conservation requirements.
• the secondary system satisfies its own coverage requirement: the secondary system satisfies the requirement for complete coverage of the area in which the secondary system serves the user;
• the secondary system and the primary system satisfy the coexistence requirement: the transmission signal of the secondary system does not cause interference to users of the primary system;
• the coexistence requirements are met between the secondary systems: the transmitted signals between the secondary systems do not cause interference to each other;
• the information obtained by the reconfiguration decision module 1301 includes:
• the level system itself covers the demand information.
• the usage information about the idle spectrum resource includes at least one of the following information: coverage of the idle spectrum, guard band information, and interference tolerance threshold.
• the reconfiguration decision module 1301 is further configured to determine that the secondary system meets the coverage requirement of the coexistence requirement, determine or adjust a transmission parameter of the secondary system antenna according to the coverage, and generate a transmission parameter reconfiguration command.
• the reconfiguration decision module is further configured to determine, according to the coverage of the idle spectrum and the protection band information of the primary system, that the coverage of the idle spectrum except the primary system and other areas outside the protection band are The coverage of the secondary system that satisfies the coexistence requirement;
• the coverage of the secondary system is determined based on energy saving requirements.
• the transmission parameter of the antenna includes at least one of the following parameters:
• Antenna transmit power, antenna azimuth, antenna pitch angle, antenna height, main lobe direction of the antenna, horizontal lobe width of the antenna, vertical lobe width, polarization mode.
• the reconfiguration decision module 1301 is further configured to determine or adjust the transmission of the relevant antenna in the secondary system when the coverage of the transmit signal of the secondary system antenna overlaps the coverage of the transmit signal of the primary system antenna a parameter that causes a coverage of a transmit signal of the secondary system antenna to no longer overlap with a coverage of a transmit signal of the primary system antenna;
• the transmission parameters of the host base station antenna are determined or adjusted such that the transmit signal of the host base station covers all working relay nodes.
• the reconfiguration decision module 1301 is further configured to: when the transmitting antenna is in a non-working state in the secondary system, determine a transmitting parameter of the relevant antenna in the secondary system and notify the network element to which the related antenna belongs;
• the transmission parameters of the associated antennas in the secondary system are directly adjusted.
• the reconfiguration decision module 1301 is further configured to: perform a control command generated after the antenna transmission parameter reconfiguration decision, to guide the secondary system to perform a specified reconfiguration operation; wherein the antenna transmission parameter includes at least the following parameters: One: Reconfigured target spectrum, antenna transmission parameter configuration information.
• the reconfiguration decision module 1301 determines a transmission parameter of the relevant antenna in the secondary system and notifies the network element to which the relevant antenna belongs, and when the relevant antenna works, the network element to which the associated antenna operates adjusts the relevant parameters of the transmitting antenna through the reconfiguration decision module 1301; When the transmitting antenna is in the working state in the level system, the reconfiguration decision module 1301 directly adjusts the transmitting parameters of the relevant antennas in the secondary system.
• the coexistence-based cognitive radio system antenna parameter adjustment apparatus of the present invention is provided for implementing the foregoing coexistence-based cognitive radio system antenna parameter adjustment method, and the coexistence-based cognitive radio system of the present invention
• the functions of the processing units in the antenna parameter adjustment apparatus can be understood by referring to the foregoing related description of the coexistence-based cognitive radio system antenna parameter adjustment method, as can be understood by referring to the related descriptions of the first to fifth embodiments.
• the functions of the processing units in the antenna parameter adjustment apparatus based on the coexistence cognitive radio system of the present invention may be implemented by corresponding functional circuits, or may be implemented by executing corresponding functional software in a processor. .
• the present invention adaptively determines the base station antenna transmission parameters of the cognitive radio system by determining the coverage requirements of the primary system and the secondary system, and adjusts accordingly.
• the invention improves the spectrum utilization rate and solves the frequency interference problem that may exist in the coexistence of the primary system and the secondary system in the cognitive radio system; by adjusting the antenna parameters, the coverage of the relevant base station is controlled, and the additional Inter-system interference caused by coverage.

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• 2012
  • 2012-08-10 CN CN201210284963.XA patent/CN103581920B/zh not_active Expired - Fee Related
• 2013
  • 2013-06-27 WO PCT/CN2013/078237 patent/WO2014023142A1/fr not_active Ceased

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