WO2013091405A1 - 一种感知无线电系统中的频谱确定方法和设备 - Google Patents
一种感知无线电系统中的频谱确定方法和设备 Download PDFInfo
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- WO2013091405A1 WO2013091405A1 PCT/CN2012/081081 CN2012081081W WO2013091405A1 WO 2013091405 A1 WO2013091405 A1 WO 2013091405A1 CN 2012081081 W CN2012081081 W CN 2012081081W WO 2013091405 A1 WO2013091405 A1 WO 2013091405A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/12—Frequency diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
- H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a frequency spectrum determining method and apparatus in a cognitive radio system. Background technique
- CR Cognitive Radio
- the basic idea is to dynamically select white space for communication by monitoring changes in the current wireless communication environment without causing interference to the authorized system. Based on this, the sensing system needs to accurately determine which licensed system frequency bands are available white space bands (that is, the introduction of the sensing system in the blank frequency band does not affect the normal operation of the authorized system); when the occupied white space band is no longer available, the sensing system These blank bands need to be withdrawn to the authorization system in a timely manner.
- the method for determining a white space band includes: (1) a sensing method. Specifically, a base station of the sensing system detects a signal strength of an authorized system in a frequency band by using a sensing algorithm, and when the signal strength is greater than a certain threshold, The base station is too close to the authorized system using this frequency band. Introducing the sensing system in this frequency band will affect the normal operation of the authorized system. Ring, this band is not a usable white space; otherwise it is a usable white space. (2) The database method. Specifically, the sensing system directly reads from the local database which frequency bands are available for a specific location.
- FIG. 1 it is a schematic diagram of the wireless sensing technology.
- the BS (Base Station) tower is the transmitting tower of the authorization system, and the BS receiver is a fixed receiving device of the authorization system.
- Radio is a transmitting (receiving) device of the sensing system. Based on this, it can be seen that when operating at the same frequency or adjacent frequency, the transmitting (receiving) device of the sensing system needs to be separated from the receiving device of the authorized system to ensure the normal operation of the authorized system.
- the sensing system when determining the white space band, only the sensing system can not cause any interference to the authorization system when using the frequency band, but since the interference between the wireless communication systems is two-way, the authorization system also interferes with the sensing system, and the sensing system There will also be interference between them, so the white space determined by the above method is not necessarily usable, and it cannot guarantee the normal use of the sensing system.
- Embodiments of the present invention provide a spectrum determining method and device in a cognitive radio system to ensure normal operation of the authorization system and the sensing system.
- an embodiment of the present invention provides a spectrum determining method in a cognitive radio system, including:
- the central management unit receives the information reported by the sensing system, and acquires usage information of the current frequency point;
- the central management unit determines available frequency point information and/or allowed transmission power information for the sensing system according to the information reported by the sensing system and the usage information of the current frequency point;
- the central management unit will use the available frequency point information and/or the allowed transmit power information The notification is notified to the sensing system.
- Embodiments of the present invention provide a spectrum determining apparatus in a cognitive radio system, including:
- a receiving module configured to receive information reported by the sensing system
- a determining module configured to determine available frequency point information and/or allowed transmit power information for the sensing system according to the information reported by the sensing system and the usage information of the current frequency point;
- a sending module configured to notify the sensing system of the available frequency point information and/or the allowed transmitting power information.
- the embodiment of the present invention has at least the following advantages: It can ensure that the sensing system and the authorization system can work normally when the sensing system is introduced in the determined available white space, and then the authorization system and the multiple sensing systems are guaranteed. coexist. DRAWINGS
- FIG. 1 is a schematic diagram of interference of a wireless sensing technology in the prior art
- FIG. 2 is a schematic flowchart of a spectrum determining method in a cognitive radio system according to Embodiment 1 of the present invention
- FIG. 3 is a schematic structural diagram of a system according to Embodiment 1 of the present invention.
- FIG. 4 is a schematic structural diagram of a spectrum determining device in a cognitive radio system according to Embodiment 3 of the present invention. detailed description
- the embodiment of the present invention provides a spectrum determining method in a cognitive radio system, which can ensure that the sensing system and the sensing system are in the determined available white space.
- the authorization system works properly, which in turn ensures the coexistence of the authorization system and multiple sensing systems.
- a spectrum determining method in a cognitive radio system is used to determine a white space band that can be used by a sensing system, and the spectrum determining method can be at least applied to LTE (Long Term Evolution) using cognitive radio technology.
- LTE Long Term Evolution
- TD-SCDMA Time Division-Synchronous Code Division Multiple Access
- HSPA High-Speed Packet Access
- CDMA Code Division Multiple Access
- GSM global system for mobile communications
- the spectrum determining method in the cognitive radio system includes the following steps:
- Step 201 The central management unit receives the information reported by the sensing system (such as the base station of the sensing system), and acquires the usage information of the current frequency point (all frequency points).
- the sensing system such as the base station of the sensing system
- the information reported by the sensing system is the information required by the coexistence strategy.
- the information reported by the sensing system is the location information of the base station of the sensing system.
- the central management unit obtains the usage information of the current frequency point by: the central management unit searches the information database to obtain the usage information of the current frequency point after receiving the information reported by the sensing system; the usage information of the current frequency point includes but is not limited to Existing system at each frequency
- the system type, the preset information used to authorize the transmission parameters of the sensing system, etc., the information used to authorize the transmission parameters of the sensing system may be the maximum tolerable power and load conditions of each working frequency point.
- Step 202 The central management unit determines, according to the information reported by the sensing system and the usage information of the current frequency point, the available frequency point information and/or the allowed transmission power information for the sensing system, and the central management unit may be based on the coexistence strategy and the sensing system.
- the reported information, the usage information of the current frequency point determines the available frequency point information and/or the allowed transmission power information for the sensing system.
- Step 203 The central management unit notifies the sensing system of the available frequency point information and/or the allowed transmitting power information, and the sensing system uses the available frequency point information to determine the available white space, and uses the allowed transmitting power information to determine its own transmission. power.
- the central management unit feeds back no available frequency points.
- the central management unit may determine the allowed transmitting power information for the sensing system according to the usage information of the current frequency point; and further notify the allowed transmitting power information.
- the sensing system uses the allowed transmit power information to determine its own transmit power.
- the central management unit after determining the available frequency point information for the sensing system and determining the allowed transmitting power information for the sensing system, the central management unit also needs to use the available frequency point information and the allowed transmitting power information to update the current frequency point in the information database. information.
- the information reported by the sensing system includes, but is not limited to, the location information of the base station reported by the sensing system, and the usage information of the current frequency point (ie, the usage of all frequency points) includes However, it is not limited to the type of radio access technology working at the current frequency point, the location information of the base station already existing at the current frequency point, and the maximum transmission power corresponding to the base station already existing at the current frequency point.
- the sensing system since the sensing system opportunistically uses the frequency of the authorization system, it is necessary to ensure the system performance of the authorization system, and it is necessary to control the degree of interference at each frequency point.
- the maximum allowable transmission power described above is indicative of the allowed frequencies at each frequency point.
- the central management unit is a sensing system based on the information reported by the sensing system and the usage information of the current frequency point based on the location information of the base station (the sensing system reports to the central management unit) and the location information of the base station that already exists at the current frequency point. Determining the available frequency point information, including: the central management unit obtains, between the base station of the sensing system and the base station already existing at the current frequency point, according to the base station location information reported by the sensing system and the location information of the base station already existing at the current frequency point.
- the central management unit determines the available frequency point information for the sensing system according to the distance information corresponding to each frequency point.
- the central management unit determines the available frequency point information for the sensing system according to the distance information corresponding to each frequency point, including: the central management unit determines whether the distance information corresponding to the frequency point satisfies the isolation distance requirement of coexistence of the same frequency coexistence or adjacent frequency, if not If satisfied, the central management unit determines that the frequency point is not the available frequency point; otherwise, the central management unit determines that the frequency point is the available frequency point.
- the central management unit may calculate the distance between the base station of the sensing system and other system base stations according to the location information of the base station reported by the sensing system and the location information of the base station that already exists at each frequency point; after that, the central management unit determines one by one
- the frequency points in the frequency band are used to obtain the frequency points that can be used by the above sensing system; wherein, for a certain frequency point, whether the sensing system and other systems satisfy the isolation distance requirement of coexistence of the same frequency or adjacent frequency are determined by comparing one by one, Once the isolation distance requirement is not met with any system, the frequency point cannot be used by the sensing system; otherwise, the frequency point is the available frequency point.
- the isolation distance requirement Dcr is Dcr>MAX(Dl, D2)
- D1 is the distance isolation required for the base station that already exists at the current frequency point when the base station reported by the sensing system interferes with the existing base station at the current frequency point.
- D2 is the distance isolation required for the normal operation of the base station reported by the sensing system when the base station reported by the base station interference sensing system already exists at the current frequency point.
- D1 and D2 are obtained by mutual interference simulation.
- the isolation distance requirement refers to the isolation distance required for both systems to work properly.
- the base station reported by the sensing system is a CRS1 system base station, and the base station already existing at the current frequency point is a CRS2 system base station.
- the distance isolation required for the CRS2 system base station to work normally is D1.
- the distance isolation required for the CRS1 system base station to work normally is D2, and the distance Dcr between the two system base stations needs to satisfy the isolation distance.
- the requirement is Dcr>MAX(Dl, D2), and the distance isolation involved can be obtained by mutual interference simulation.
- the information of the current frequency point is stored in the information database (the location information of the base station already existing at each frequency point);
- the usage information of the central management unit for obtaining the current frequency point includes: the central management unit searches the information database Obtaining the location information of the base station that already exists at the current frequency point.
- the central management unit further includes: updating, by the central management unit, the base station location information reported by the sensing system to the information database.
- the central management unit determines the allowed transmit power information for the sensing system according to the usage information of the current frequency point, including: the central management unit determines the allowed transmission of the sensing system.
- the power information is: the maximum transmit power allowed at the current frequency point, minus the maximum transmit power corresponding to the base station already existing at the current frequency point, minus the power leakage of the other frequency points to the current frequency point.
- the information about the current frequency point is stored in the information database (that is, the maximum transmission power corresponding to the base station already existing at the current frequency point);
- the usage information of the central management unit for acquiring the current frequency point includes: The maximum transmit power corresponding to the base station that already exists at the current frequency point is obtained by searching the information database.
- the method further includes: the central management unit will perceive the transmit power allowed by the system The information is updated to the information database.
- the central management unit and the information database are located on the same device or on different devices.
- the central management unit and the information database are logical functional units, and the structural forms between the central management unit and the information database may be diverse; for example, when the information database has a management function, the central management unit may be located on the information database; Or, when the central management unit has the function of storing a priori information, the information database may be located on the central management unit; or, the central management unit and the information database are two independent modules in parallel; further, the central management unit and the information database may be integrated in Existing devices (such as base stations) can also be stand-alone devices.
- a CRS ie, a sensing system
- the central management unit is responsible for querying the information database, obtaining the frequency usage of the current frequency band, determining the available frequency and transmission power for the CRS according to the reporting information of the CRS according to the coexistence strategy, to ensure the CRS system and the authorization system, and other CRS systems. Coexistence between;
- the central management unit also needs to update the information database.
- the information database is used to provide frequency usage on the current frequency band.
- the spectrum determining method in the cognitive radio system includes the following steps:
- Step 1 The central management unit obtains the usage status at each frequency point (that is, the usage information of each frequency point) by searching the information database. As shown in the frequency point information table shown in Table 1, the usage information of each frequency point is recorded in the frequency point information table.
- Occupancy DTMB is not used by CRS2
- CRS2 is not used Any system is used by any system Base station location DTMB CRS2 makes CRS2
- Step 2 The central management unit calculates the distance of the CRS1 from other systems according to the location information reported by the CRS1 and the base station location information of each wireless system on the frequency information table.
- the following distances are included: a distance between the CRS1 base station and the DTMB base station D_CRS1_To_DTMB, a distance between the CRS1 base station and the base station of the CRS2 using the frequency point F3, D_CRS1_To_CRS2_F3, and between the base station of the CRS1 base station and the CRS2 using the frequency point F4.
- the distance D_CRSl_To_CRS2_F4 The distance D_CRSl_To_CRS2_F4.
- Step 3 For a certain frequency point Fn, the central management unit determines whether D_CRS1_To_DTMB satisfies the same-frequency/adjacent frequency isolation distance requirement with the DTMB system; if not, the frequency point Fn is unavailable; if yes, the central management unit determines whether D_CRS1_To_CRS2_F3 is Satisfying the same-frequency/adjacent frequency isolation distance requirement with the CRS2 system; if not, the frequency point Fn is not available; if yes, the central management unit determines whether D_CRS1_To_CRS2_F4 satisfies the same-frequency/adjacent frequency isolation distance requirement from the CRS2 system; , then the frequency point Fn is not available; if yes, the frequency point Fn is available.
- the CRS1 Since the frequency point F1 is used by the authorization system, if the 0_01 ⁇ 21_ ⁇ 0_0 ⁇ 18 is greater than or equal to the same-frequency isolation distance requirement when coexisting with the main system, the CRS1 is in the The location uses the frequency point to meet the co-frequency coexistence requirement with the primary system, and the frequency is not available; since the frequency point F1 is the second adjacent frequency of F3, if D_CRS1_To_CRS2_F3 is greater than or equal to the CRS second adjacent frequency coexistence requirement Isolation distance, CRS1 uses frequency point F1 at this position to satisfy CRS2 second adjacent frequency coexistence Requirement, otherwise, the frequency is not available; since the frequency point F1 is the third adjacent frequency of F4, if D_CRS1_To_CRS2_F4 is greater than or equal to the isolation distance required for coexistence with the CRS third adjacent frequency, CRS1 uses the frequency point F1 at the position to satisfy
- the judgment method for other frequency points is similar to the judgment F1, and will not be described here.
- a coexistence policy such as an isolation distance policy
- the embodiment of the present invention further provides a spectrum determining device (ie, a central management unit) in the cognitive radio system.
- a spectrum determining device ie, a central management unit
- the device includes:
- the receiving module 11 is configured to receive information reported by the sensing system.
- the determining module 13 is configured to determine available frequency point information and/or allowed transmission power information for the sensing system according to the information reported by the sensing system and the usage information of the current frequency point;
- the sending module 14 is configured to notify the sensing system of the available frequency point information and/or the allowed transmitting power information.
- the information reported by the sensing system includes location information of the base station reported by the sensing system, and the usage information of the current frequency point includes location information of a base station that already exists at the current frequency point;
- the determining module 13 is configured to obtain, according to the location information of the base station reported by the sensing system, and the location information of the base station that is already present at the current frequency point, the base station of the sensing system and the current frequency point already exist. The distance information between the base stations; and determining the available frequency point information for the sensing system according to the distance information corresponding to each frequency point.
- the determining module 13 is further configured to determine whether the distance information corresponding to the frequency point is The isolation distance requirement for coexistence of the same frequency coexistence or adjacent frequency is satisfied. If not, it is determined that the frequency point is not the available frequency point; otherwise, the frequency point is determined to be the available frequency point.
- the usage information of the current frequency point is stored in the information database
- the obtaining module 12 is specifically configured to obtain, by searching the information database, location information of a base station that already exists at the current frequency point;
- the usage information of the current frequency point includes: a maximum transmission power corresponding to the base station already existing at the current frequency point;
- the determining module 13 is specifically configured to determine that the transmit power information allowed by the sensing system is: the maximum transmit power allowed at the current frequency point, and the maximum corresponding to the base station already existing at the current frequency point. The transmit power is subtracted from the power at other frequencies to the power at the current frequency.
- the usage information of the current frequency point is stored in the information database
- the obtaining module 12 is specifically configured to obtain, by searching the information database, a maximum transmit power corresponding to a base station that already exists at the current frequency point;
- the spectrum determining device is located on the same device as the information database, or is located on a different device.
- the sensing system when the sensing system is introduced into the determined available white space, the sensing system and the authorization system can work normally, and then the coexistence of the authorization system and the plurality of sensing systems is ensured.
- the modules of the device of the present invention may be integrated or integrated.
- the above modules can be combined into one module, or can be further split into multiple sub-modules.
- the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way.
- the form of a software product is stored in a storage medium, comprising instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the embodiments of the present invention. method.
- modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the description of the embodiments, or may be correspondingly changed in one or more apparatuses different from the embodiment.
- the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
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Abstract
本发明公开了一种感知无线电系统中的频谱确定方法和设备,该方法包括:中心管理单元接收感知系统上报的信息,并获取当前频点的使用信息;所述中心管理单元根据所述感知系统上报的信息以及所述当前频点的使用信息,为所述感知系统确定可用频点信息和/或允许的发射功率信息;所述中心管理单元将所述可用频点信息和/或允许的发射功率信息通知给所述感知系统。本发明实施例中,可以保证在确定的可用空白频段上引入感知系统时,感知系统和授权系统都可以正常工作,继而保证授权系统和多个感知系统的共存。
Description
一种感知无线电系统中的频语确定方法和设备 本申请要求于 2011 年 12 月 23 日提交中国专利局, 申请号为 201110437933.3 , 发明名称为 "一种感知无线电系统中的频谱确定方 法和设备"的中国专利申请的优先权, 其全部内容通过引用结合在本 申请中。 技术领域
本发明涉及通信技术领域,尤其涉及一种感知无线电系统中的频 谱确定方法和设备。 背景技术
随着无线通信技术的发展, 频谱资源贫乏问题日益严重, 为了緩 解频谱资源紧张的现状, 当前对频谱进行了分析, 发现某些频段(如 电视频段)在大多数时间内并未使用或在大多数地域内并未使用, 且 发现某些频段出现了多系统多用户竟争的情况,频谱资源的使用并不 均衡(某些业务承载量大的系统没有足够频谱资源, 另一些业务承载 量不大的系统占用太多频谱资源)。
CR ( Cognitive Radio, 感知无线电)技术在这种背景下产生, 其 基本思想是: 在不对授权系统造成干扰的前提下, 通过监测当前无线 通信环境的变化, 来动态选择空白频段以进行通信。 基于此, 感知系 统需要准确判断出哪些授权系统的频段是可用的空白频段(即在空白 频段上引入感知系统不会影响授权系统的正常工作); 当占用的空白 频段不再可用时,感知系统需要及时的将这些空白频段退让给授权系 统。
现有技术中,确定空白频段的方法包括:(1 )感知方法,具体的, 感知系统的基站通过感知算法检测某个频段上授权系统的信号强度, 当信号强度大于某门限值时,认为基站距离使用这个频段的授权系统 距离过近,在此频段上引入感知系统会对授权系统的正常工作产生影
响, 该频段不是可使用的空白频段; 否则是可使用的空白频段。 (2 ) 数据库方法, 具体的, 感知系统从本地数据库中直接读取针对某个具 体位置, 哪些频段是可使用的空白频段。
如图 1所示, 为无线感知技术的干 4尤示意图, BS ( Base Station, 基站) tower (塔)是授权系统的发射塔, BS receiver (接收者)是 授权系统的一个固定接收设备, cognitive radio是感知系统的一个发 射(接收)设备。 基于此可以看出, 在同频或者邻频工作时, 感知系 统的发射(接收)设备需要和授权系统的接收设备间隔一定的距离才 可以保证授权系统的正常工作。
在实现本发明的过程中,发明人发现现有技术中至少存在以下问 题:
现有技术在确定空白频段时,只考虑感知系统使用该频段时对授 权系统不能造成任何干扰, 但由于无线通信系统间的干扰是双向的, 授权系统也会对感知系统产生干扰, 且感知系统之间也会存在干扰, 因此采用上述方法确定出的空白频段, 未必是真正可用的, 其无法保 证感知系统的正常使用。
发明内容
本发明实施例提供一种感知无线电系统中的频谱确定方法和设 备, 以保证授权系统和感知系统的正常工作。
为了达到上述目的,本发明实施例提供一种感知无线电系统中的 频谱确定方法, 包括:
中心管理单元接收感知系统上报的信息,并获取当前频点的使用 信息;
所述中心管理单元根据所述感知系统上报的信息以及所述当前 频点的使用信息, 为所述感知系统确定可用频点信息和 /或允许的发 射功率信息;
所述中心管理单元将所述可用频点信息和 /或允许的发射功率信
息通知给所述感知系统。
本发明实施例提供一种感知无线电系统中的频谱确定设备, 包 括:
接收模块, 用于接收感知系统上报的信息;
获耳^莫块, 用于获取当前频点的使用信息;
确定模块,用于根据所述感知系统上报的信息以及所述当前频点 的使用信息, 为所述感知系统确定可用频点信息和 /或允许的发射功 率信息;
发送模块, 用于将所述可用频点信息和 /或允许的发射功率信息 通知给所述感知系统。
与现有技术相比, 本发明实施例至少具有以下优点: 可以保证在 确定的可用空白频段上引入感知系统时,感知系统和授权系统都可以 正常工作, 继而保证授权系统和多个感知系统的共存。 附图说明
图 1为现有技术中无线感知技术的干扰示意图;
图 2 为本发明实施例一提供的一种感知无线电系统中的频谱确 定方法流程示意图;
图 3为本发明实施例一所提供的系统结构示意图
图 4 为本发明实施例三提供的一种感知无线电系统中的频谱确 定设备结构示意图。 具体实施方式
下面结合附图和实施例,对本发明的具体实施方式作进一步详细 描述:
下面将结合本发明中的附图, 对本发明中的技术方案进行清楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明的一部分实施例, 而不是全部的实施例。基于本发明中的实施例, 本领域普通技术人员
在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发 明保护的范围。
实施例一
当前在确定可用空白频段时, 只考虑感知系统使用该频段时, 对 授权系统不能造成任何干扰,而没有考虑到授权系统对感知系统所造 成的干扰、 以及感知系统之间造成的干扰, 从而导致确定出的空白频 段未必是真正可用的; 针对上述问题, 本发明实施例提供一种感知无 线电系统中的频谱确定方法,可以保证在确定的可用空白频段上弓 I入 感知系统时, 感知系统和授权系统都可以正常工作, 继而保证授权系 统和多个感知系统的共存。
本发明实施例一所提供的一种感知无线电系统中的频谱确定方 法, 用于确定感知系统可以使用的空白频段, 且该频谱确定方法可以 至少适用于采用认知无线电技术的 LTE ( Long Term Evolution , 长期 演进 )、 TD-SCDMA ( Time Division-Synchronous Code Division Multiple Access , 时分同步码分多址)、 HSPA ( High-Speed Packet Access , 高速链路分组接入)、 CDMA ( Code Division Multiple Access , 码分多址) -2000、 WCDMA( Wideband Code Division Multiple Access, 宽带码分多址 )、 GSM ( global system for mobile communications , 全 球移动通信系统)等移动通信系统。
如图 2 所示, 该感知无线电系统中的频谱确定方法包括以下步 骤:
步骤 201 , 中心管理单元接收感知系统(如感知系统的基站)上 报的信息, 并获取当前频点 (所有频点) 的使用信息。
本发明实施例中, 感知系统上报的信息为共存策略所需要的信 息; 例如, 共存策略需要感知系统的基站的位置执行相关处理时, 则 感知系统上报的信息为感知系统的基站的位置信息。
中心管理单元获取当前频点的使用信息具体为: 中心管理单元在 接收到感知系统上报的信息后, 查找信息数据库, 以获取当前频点的 使用信息;该当前频点的使用信息包括但不限于各频点上已存在的系
统类型, 预设的用于为感知系统发射参数做授权的信息等, 用于为感 知系统发射参数做授权的信息可以为各工作频点的最大可容忍功率、 负载情况等信息。
步骤 202, 中心管理单元根据感知系统上报的信息以及当前频点 的使用信息, 为感知系统确定可用频点信息和 /或允许的发射功率信 具体的, 中心管理单元可以基于共存策略, 以及感知系统上报的 信息、 当前频点的使用信息为感知系统确定可用频点信息和 /或允许 的发射功率信息。
步骤 203 ,中心管理单元将可用频点信息和 /或允许的发射功率信 息通知给感知系统,由感知系统利用该可用频点信息确定可用空白频 段, 并利用该允许的发射功率信息确定自身的发射功率。 此外, 在为 感知系统确定可用频点信息时, 如果没有可用频点信息, 则中心管理 单元反馈无可用频点。
本发明实施例中, 在为感知系统确定可用频点信息的过程中, 中 心管理单元可以根据当前频点的使用信息,为感知系统确定允许的发 射功率信息; 并进一步将允许的发射功率信息通知给感知系统, 由感 知系统利用该允许的发射功率信息确定自身的发射功率。
此外, 在为感知系统确定可用频点信息, 以及为感知系统确定允 许的发射功率信息之后,中心管理单元还需要利用可用频点信息以及 允许的发射功率信息, 更新信息数据库中的当前频点使用信息。
本发明实施例中, 当共存策略为距离策略时, 则感知系统上报的 信息包括但不限于感知系统所上报的基站位置信息,且当前频点的使 用信息(即所有频点的使用情况)包括但不限于当前频点上工作的无 线接入技术类型、在当前频点上已经存在的基站的位置信息、 以及在 当前频点上已经存在的基站所对应的最大发射功率。 其中, 由于感知 系统机会性的使用授权系统的频点, 因此需要保证授权系统的系统性 能, 且需要控制各频点上的干扰程度, 上述允许的最大发射功率则表 征了各个频点上允许的干扰大小。
基于上述基站位置信息(感知系统向中心管理单元上报的)以及 在当前频点上已经存在的基站的位置信息,则中心管理单元根据感知 系统上报的信息以及当前频点的使用信息,为感知系统确定可用频点 信息, 包括: 中心管理单元根据感知系统上报的基站位置信息、 以及 在当前频点上已经存在的基站的位置信息,获得感知系统的基站与当 前频点上已经存在的基站之间的距离信息; 之后, 中心管理单元根据 各频点所对应的距离信息为感知系统确定可用频点信息。中心管理单 元根据各频点所对应的距离信息为感知系统确定可用频点信息, 包 括: 中心管理单元判断频点所对应的距离信息是否满足同频共存或邻 频共存的隔离距离要求, 如果不满足, 则中心管理单元确定频点不为 可用频点; 否则, 中心管理单元确定频点为可用频点。
具体的, 中心管理单元可根据感知系统上报的基站位置信息、 以 及在各频点上已经存在的基站的位置信息,计算感知系统基站与其他 系统基站之间的距离; 之后, 中心管理单元逐个判断频带上的频点, 得出上述感知系统可以使用的频点; 其中, 对于某个频点, 通过逐个 比较判断感知系统与其他系统之间是否满足同频共存或邻频共存的 隔离距离要求, 一旦与任何一个系统不满足隔离距离要求, 则该频点 不可为感知系统使用; 否则, 该频点为可用频点。
其中, 隔离距离要求 Dcr为 Dcr>MAX(Dl,D2), D1为当感知系 统上报的基站干扰当前频点上已经存在的基站时, 当前频点上已经存 在的基站正常工作所需的距离隔离度, D2 为当当前频点上已经存在 的基站干扰感知系统上报的基站时,感知系统上报的基站正常工作所 需的距离隔离度, D1与 D2由互干扰仿真获得。
具体的,隔离距离要求是指满足两个系统均可正常工作所需的隔 离距离。 例如, 感知系统上报的基站为 CRS1系统基站, 当前频点上 已经存在的基站为 CRS2系统基站, 当 CRS1系统基站干扰 CRS2系 统基站时, CRS2系统基站正常工作所需的距离隔离度为 D1 ,当 CRS2 系统基站干扰 CRS1系统基站时, CRS1系统基站正常工作所需的距 离隔离度为 D2, 则两系统基站之间的距离 Dcr需要满足的隔离距离
要求为 Dcr>MAX(Dl,D2),其中涉及到的距离隔离度可由互干扰仿真 得到。
需要注意的是, 在信息数据库中存储有当前频点的使用信息(各 频点上已经存在的基站的位置信息); 中心管理单元获取当前频点的 使用信息包括: 中心管理单元通过查找信息数据库获取在当前频点上 已经存在的基站的位置信息; 中心管理单元为感知系统确定可用频点 信息之后还包括: 中心管理单元将感知系统上报的基站位置信息更新 到信息数据库。
基于上述在当前频点上已经存在的基站所对应的最大发射功率, 中心管理单元根据当前频点的使用信息,为感知系统确定允许的发射 功率信息,包括:中心管理单元确定感知系统允许的发射功率信息为: 当前频点上允许的最大发射功率,减去在当前频点上已经存在的基站 所对应的最大发射功率,减去其他频点的功率泄露到当前频点上的功 率。
具体的, 中心管理单元确定感知系统被允许的最大发射功率的计 算方法为: 感知系统允许的发射功率 =当前频点上允许的最大发射功 率-该当前频点上已有的系统的发射功率 (即已经存在的基站所对应 的最大发射功率) -已有系统辐射到该频带上的功率 (即其他频点的 功率泄露到当前频点上的功率)。
需要注意的是, 在信息数据库中存储有当前频点的使用信息(即 当前频点上已经存在的基站所对应的最大发射功率); 中心管理单元 获取当前频点的使用信息包括: 中心管理单元通过查找信息数据库获 取在当前频点上已经存在的基站所对应的最大发射功率; 进一步的, 中心管理单元为感知系统确定允许的发射功率信息之后还包括: 中心 管理单元将感知系统允许的发射功率信息更新到信息数据库。
本发明实施例中,中心管理单元与信息数据库位于相同的装置上 或者位于不同的装置上。 具体的, 中心管理单元和信息数据库是逻辑 功能单元, 中心管理单元与信息数据库之间的结构形式可以多样; 如 信息数据库具有管理功能时, 中心管理单元可以位于信息数据库上;
或, 中心管理单元具有存储先验信息功能时, 信息数据库可以位于中 心管理单元上; 或, 中心管理单元与信息数据库是并列的两个独立模 块;进一步的,中心管理单元与信息数据库可以集成在现有的装置(如 基站)上, 也可以为独立的装置。
如图 3所示, 为本发明实施例的系统结构示意图, CRS (即感知 系统)向中心管理单元请求可用频点, 并发送本感知系统基站的位置 信息。 中心管理单元负责查询信息数据库, 获取当前频带上的频点使 用情况, 根据 CRS的上报信息, 并依据共存策略为 CRS确定可用频 点及发射功率, 以保证 CRS系统与授权系统、 及其他 CRS系统之间 的共存; 此外, 中心管理单元还需要更新信息数据库。 信息数据库用 于提供当前频带上的频点使用情况。
综上所述, 本发明实施例中, 可以保证在确定的可用空白频段上 引入感知系统时, 感知系统和授权系统都可以正常工作, 继而保证授 权系统和多个感知系统的共存。 实施例二
为了更加清楚的阐述本发明实施例提供的技术方案,以下结合具 体的应用场景进行说明。 该应用场景下,假设当前频段上共有五个频 点, 分别为 Fl、 F2、 F3、 F4、 F5; 发出请求的感知系统为 CRS1 , 当 前授权系统为 DTMB ( Digital Television Terrestrial Multimedia Broadcasting, 数字电视地面多媒体广播), 另一个在当前频带上工作 的感知系统为 CRS2。
基于上述应用场景,本发明实施例二所提供的感知无线电系统中 的频谱确定方法, 包括以下步骤:
步骤 1、 中心管理单元通过查找信息数据库, 获取各个频点上的 使用情况(即各个频点的使用信息)。 如表 1所示的频点信息表, 该 频点信息表中记录有各个频点的使用信息。
占用情况 DTMB 没有被 CRS2 CRS2 没有被 使用 任何 系 任何系 统使用 统使用 基站位置 DTMB CRS2使 CRS2使
基站位 用 频点 用 频点
置坐标 F3 基站 F4 基站
位置 坐 位置 坐
标 标
步骤 2、 中心管理单元根据 CRS1上报的位置信息, 及频点信息 表上的各无线系统的基站位置信息,计算出 CRS1距离其他系统的距 离。 本实施例中, 共包括如下距离: CRS1基站与 DTMB基站之间的 距离 D_CRSl_To_DTMB, CRSl基站与 CRS2使用频点 F3的基站之 间的距离 D_CRSl_To_CRS2_F3 ,及 CRSl基站与 CRS2使用频点 F4 的基站之间的距离 D_CRSl_To_CRS2_F4。
步骤 3,对于某个频点 Fn,中心管理单元判断 D_CRSl_To_DTMB 是否满足与 DTMB系统的同频 /邻频隔离距离要求; 如果否, 则频点 Fn不可用; 如果是, 则中心管理单元判断 D_CRSl_To_CRS2_F3是 否满足与 CRS2系统的同频 /邻频隔离距离要求; 如果否, 则频点 Fn 不可用; 如果是, 则中心管理单元判断 D_CRSl_To_CRS2_F4是否满 足与 CRS2系统的同频 /邻频隔离距离要求; 如果否, 则频点 Fn不可 用; 如果是, 则频点 Fn可用。
以频点 Fn为频点 F1为例进行说明, 则: 由于频点 F1被授权系 统使用,因此如果0_0½1_丁0_0丁^18大于等于与主系统共存时的同 频隔离距离要求, CRS1在该位置使用该频点, 可以满足与主系统的 同频共存要求, 反之该频点不可用; 由于频点 F1是 F3的第二邻频, 因此如果 D_CRSl_To_CRS2_F3大于等于与 CRS第二邻频共存要求 的隔离距离, CRS1在该位置使用频点 F1满足于 CRS2第二邻频共存
要求, 反之该频点不可用; 由于频点 F1是 F4的第三邻频, 因此如果 D_CRSl_To_CRS2_F4大于等于与 CRS第三邻频共存要求的隔离距 离, CRS1在该位置使用频点 F1满足于 CRS2第三邻频共存要求,反 之该频点不可用; 如果 F1对于上述要求均满足, 则 F1可用; 任意一 条不满足, 则该地理区域 F1不可为 CRS1使用。
对于其他频点的判断方法同判断 F1的相似, 在此不再赘述。 综上所述, 本发明实施例中, 通过提供一种依据共存策略(如隔 离距离策略)为感知系统确定可用空白频段并分配的流程, 可以保证 在确定的可用空白频段上弓 I入感知系统时,感知系统和授权系统都可 以正常工作, 继而保证授权系统和多个感知系统的共存。
实施例三
基于与上述方法同样的发明构思,本发明实施例中还提供了一种 感知无线电系统中的频谱确定设备(即中心管理单元), 如图 4所示, 该设备包括:
接收模块 11 , 用于接收感知系统上报的信息;
获耳 ^莫块 12, 用于获取当前频点的使用信息;
确定模块 13, 用于根据所述感知系统上报的信息以及所述当前 频点的使用信息, 为所述感知系统确定可用频点信息和 /或允许的发 射功率信息;
发送模块 14, 用于将所述可用频点信息和 /或允许的发射功率信 息通知给所述感知系统。
所述感知系统上报的信息包括所述感知系统上报的基站位置信 息,所述当前频点的使用信息包括在所述当前频点上已经存在的基站 的位置信息;
所述确定模块 13 , 具体用于根据所述感知系统上报的基站位置 信息、 以及在所述当前频点上已经存在的基站的位置信息, 获得所述 感知系统的基站与当前频点上已经存在的基站之间的距离信息;以及 根据各频点所对应的距萬信息为所述感知系统确定可用频点信息。
所述确定模块 13 , 进一步用于判断频点所对应的距离信息是否
满足同频共存或邻频共存的隔离距离要求, 如果不满足, 则确定所述 频点不为可用频点; 否则, 确定所述频点为可用频点。
在信息数据库中存储有所述当前频点的使用信息;
所述获取模块 12, 具体用于通过查找所述信息数据库获取在所 述当前频点上已经存在的基站的位置信息;
并在为所述感知系统确定可用频点信息之后,将所述感知系统上 报的基站位置信息更新到所述信息数据库。
所述当前频点的使用信息包括:在所述当前频点上已经存在的基 站所对应的最大发射功率;
所述确定模块 13 , 具体用于确定所述感知系统允许的发射功率 信息为: 所述当前频点上允许的最大发射功率, 减去在所述当前频点 上已经存在的基站所对应的最大发射功率,减去其他频点的功率泄露 到所述当前频点上的功率。
在信息数据库中存储有所述当前频点的使用信息;
所述获取模块 12, 具体用于通过查找所述信息数据库获取在所 述当前频点上已经存在的基站所对应的最大发射功率;
并在为所述感知系统确定允许的发射功率信息之后,将所述感知 系统允许的发射功率信息更新到所述信息数据库。
本发明实施例中,所述频谱确定设备与所述信息数据库位于相同 的装置上, 或者, 位于不同的装置上。
综上所述, 本发明实施例中, 可以保证在确定的可用空白频段上 引入感知系统时, 感知系统和授权系统都可以正常工作, 继而保证授 权系统和多个感知系统的共存。
其中,本发明装置的各个模块可以集成于一体,也可以分离部署。 上述模块可以合并为一个模块, 也可以进一步拆分成多个子模块。 通过以上的实施方式的描述,本领域的技术人员可以清楚地了解 到本发明可借助软件加必需的通用硬件平台的方式来实现, 当然也可 以通过硬件,但很多情况下前者是更佳的实施方式。基于这样的理解,
软件产品的形式体现出来, 该计算机软件产品存储在一个存储介质 中, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服 务器, 或者网络设备等)执行本发明各个实施例所述的方法。
本领域技术人员可以理解附图只是一个优选实施例的示意图,附 图中的模块或流程并不一定是实施本发明所必须的。
本领域技术人员可以理解实施例中的装置中的模块可以按照实 施例描述进行分布于实施例的装置中,也可以进行相应变化位于不同 于本实施例的一个或多个装置中。上述实施例的模块可以合并为一个 模块, 也可以进一步拆分成多个子模块。
上述本发明实施例序号仅仅为了描述, 不代表实施例的优劣。 以上公开的仅为本发明的几个具体实施例, 但是, 本发明并非局 限于此,任何本领域的技术人员能思之的变化都应落入本发明的保护 范围。
Claims
1、 一种感知无线电系统中的频谱确定方法, 其特征在于, 包括: 中心管理单元接收感知系统上报的信息,并获取当前频点的使用 信息;
所述中心管理单元根据所述感知系统上报的信息以及所述当前 频点的使用信息, 为所述感知系统确定可用频点信息和 /或允许的发 射功率信息;
所述中心管理单元将所述可用频点信息和 /或允许的发射功率信 息通知给所述感知系统。
2、 如权利要求 1所述的方法, 其特征在于, 所述感知系统上报 的信息包括所述感知系统上报的基站位置信息,所述当前频点的使用 信息包括在所述当前频点上已经存在的基站的位置信息;
所述中心管理单元根据所述感知系统上报的信息以及所述当前 频点的使用信息, 为所述感知系统确定可用频点信息, 包括:
所述中心管理单元根据所述感知系统上报的基站位置信息、以及 在所述当前频点上已经存在的基站的位置信息,获得所述感知系统的 基站与当前频点上已经存在的基站之间的距离信息;
所述中心管理单元根据各频点所对应的距离信息为所述感知系 统确定可用频点信息。
3、 如权利要求 2所述的方法, 其特征在于, 所述中心管理单元 根据各频点所对应的距离信息为所述感知系统确定可用频点信息,包 括:
所述中心管理单元判断频点所对应的距离信息是否满足同频共 存或邻频共存的隔离距离要求, 如果不满足, 则所述中心管理单元确 定所述频点不为可用频点; 否则, 所述中心管理单元确定所述频点为 可用频点。
4、 如权利要求 3所述的方法, 其特征在于, 所述隔离距离要求 Dcr为 Dcr>MAX(Dl,D2), 其中, Dl 为当所述感知系统上报的基站 干扰所述当前频点上已经存在的基站时,所述当前频点上已经存在的 基站正常工作所需的距离隔离度, D2为当所述当前频点上已经存在 的基站干扰所述感知系统上报的基站时,所述感知系统上报的基站正 常工作所需的距离隔离度, D1与 D2由互干扰仿真获得。
5、 如权利要求 2所述的方法, 其特征在于, 在信息数据库中存 储有所述当前频点的使用信息;
所述中心管理单元获取当前频点的使用信息包括:所述中心管理 单元通过查找所述信息数据库获取在所述当前频点上已经存在的基 站的位置信息;
所述中心管理单元为所述感知系统确定可用频点信息之后还包 括:所述中心管理单元将所述感知系统上 的基站位置信息更新到所 述信息数据库。
6、 如权利要求 1所述的方法, 其特征在于, 所述当前频点的使 用信息包括:在所述当前频点上已经存在的基站所对应的最大发射功 率;
所述中心管理单元根据所述当前频点的使用信息,为所述感知系 统确定允许的发射功率信息, 包括:
所述中心管理单元确定所述感知系统允许的发射功率信息为:所 述当前频点上允许的最大发射功率,减去在所述当前频点上已经存在 的基站所对应的最大发射功率,减去其他频点的功率泄露到所述当前 频点上的功率。
7、 如权利要求 6所述的方法, 其特征在于, 在信息数据库中存 储有所述当前频点的使用信息;
所述中心管理单元获取当前频点的使用信息包括:所述中心管理 单元通过查找所述信息数据库获取在所述当前频点上已经存在的基 站所对应的最大发射功率;
所述中心管理单元为所述感知系统确定允许的发射功率信息之 后还包括:所述中心管理单元将所述感知系统允许的发射功率信息更 新到所述信息数据库。
8、 如权利要求 5或 7所述的方法, 其特征在于, 所述中心管理 单元与所述信息数据库位于相同的装置上,或者,位于不同的装置上。
9、 一种感知无线电系统中的频谱确定设备, 其特征在于, 包括: 接收模块, 用于接收感知系统上报的信息;
获耳^莫块, 用于获取当前频点的使用信息;
确定模块,用于根据所述感知系统上报的信息以及所述当前频点 的使用信息, 为所述感知系统确定可用频点信息和 /或允许的发射功 率信息;
发送模块, 用于将所述可用频点信息和 /或允许的发射功率信息 通知给所述感知系统。
10、 如权利要求 9所述的设备, 其特征在于, 所述感知系统上报 的信息包括所述感知系统上报的基站位置信息,所述当前频点的使用 信息包括在所述当前频点上已经存在的基站的位置信息;
所述确定模块, 具体用于根据所述感知系统上报的基站位置信 息、 以及在所述当前频点上已经存在的基站的位置信息, 获得所述感 知系统的基站与当前频点上已经存在的基站之间的距离信息;以及根 据各频点所对应的距离信息为所述感知系统确定可用频点信息。
11、 如权利要求 10所述的设备, 其特征在于,
所述确定模块,进一步用于判断频点所对应的距离信息是否满足 同频共存或邻频共存的隔离距离要求, 如果不满足, 则确定所述频点 不为可用频点; 否则, 确定所述频点为可用频点。
12、 如权利要求 10所述的设备, 其特征在于, 在信息数据库中 存储有所述当前频点的使用信息;
所述获取模块,具体用于通过查找所述信息数据库获取在所述当 前频点上已经存在的基站的位置信息;
并在为所述感知系统确定可用频点信息之后,将所述感知系统上 报的基站位置信息更新到所述信息数据库。
13、 如权利要求 9所述的设备, 其特征在于, 所述当前频点的使 用信息包括:在所述当前频点上已经存在的基站所对应的最大发射功 率;
所述确定模块,具体用于确定所述感知系统允许的发射功率信息 为: 所述当前频点上允许的最大发射功率, 减去在所述当前频点上已 经存在的基站所对应的最大发射功率,减去其他频点的功率泄露到所 述当前频点上的功率。
14、 如权利要求 13所述的设备, 其特征在于, 在信息数据库中 存储有所述当前频点的使用信息;
所述获取模块,具体用于通过查找所述信息数据库获取在所述当 前频点上已经存在的基站所对应的最大发射功率;
并在为所述感知系统确定允许的发射功率信息之后,将所述感知 系统允许的发射功率信息更新到所述信息数据库。
15、 如权利要求 12或 14所述的设备, 其特征在于, 所述频谱确 定设备与所述信息数据库位于相同的装置上, 或者, 位于不同的装置 上。
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