WO2017113933A1 - 设备到设备发现方法、小基站节能方法及小基站、宏基站 - Google Patents

设备到设备发现方法、小基站节能方法及小基站、宏基站 Download PDF

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Publication number
WO2017113933A1
WO2017113933A1 PCT/CN2016/102184 CN2016102184W WO2017113933A1 WO 2017113933 A1 WO2017113933 A1 WO 2017113933A1 CN 2016102184 W CN2016102184 W CN 2016102184W WO 2017113933 A1 WO2017113933 A1 WO 2017113933A1
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base station
discovery
small base
authorization request
macro base
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PCT/CN2016/102184
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English (en)
French (fr)
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陈力
黄强
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中兴通讯股份有限公司
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Publication of WO2017113933A1 publication Critical patent/WO2017113933A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • the present invention relates to the field of communications, and in particular, to a device to device (D2D) discovery method, a small base station energy saving method, and corresponding small base stations and macro base stations.
  • D2D device to device
  • a small cell refers to a base station type that is much smaller than a conventional macro base station in terms of product form, transmission power, coverage, and the like. From the perspective of transmit power, the typical transmit power is between 100mW and 5W; from the weight point of view, the common weight is between 2 and 10kg; from the networking perspective, it supports multiple technologies including DSL/fiber/WLAN and cellular technology. Backhaul; also has automatic neighbor discovery, self-configuration and other SON functions. After statistical analysis, the vast majority of data services occur in indoor or hotspot areas. Compared with macro base stations, small base stations can more effectively improve indoor deep coverage, increase network capacity, and enhance user perception, and thus have attracted more and more attention from the industry.
  • Small base stations have four product forms: the first is called FemtoCell, which is mainly used in home and business environments; the second is called PicoCell, which is used in indoor public places such as airports, railway stations, shopping centers, etc.
  • the third type, called MicroCell is limited to urban or rural areas where the base station cannot deploy macro base stations; the last type is called MetroCell, which is mainly used in urban hotspots to reduce capacity bottlenecks or rural areas.
  • MetroCell which is mainly used in urban hotspots to reduce capacity bottlenecks or rural areas.
  • Increasing the number of small base stations in hotspots can effectively increase the cell capacity and reduce coverage holes.
  • dense small base stations increase inter-cell interference, number of handovers and signaling interactions, and consume more power. Therefore, when a small base station has no capacity coverage requirement or no User Equipment (UE) connection, the small base station can be turned off to save energy and reduce interference.
  • UE User Equipment
  • the small base station When the small base station is in the on state, it can acquire information such as uplink channel information SRS (Sounding Reference Signal) and channel state indication information/precoding indication/rank indication (CQI/PMI/RI), and the UE monitors.
  • Physical downlink control channel Physical The Downlink Control Channel (Physical The Downlink Control Channel (PDCCH) receives data on the Physical Downlink Shared Channel (PDSCH) according to the uplink and downlink scheduling information, and transmits data on the Physical Uplink Shared Channel (PUSCH).
  • the shutdown operation can be performed to save power consumption and reduce interference.
  • the process of discovering the UE by the small base station is not provided.
  • a device-to-device D2D discovery method includes:
  • the small base station sends a D2D discovery authorization request to the macro base station, and acquires the D2D discovery resource allocated by the macro base station to the small base station;
  • the small base station performs D2D discovery according to the D2D discovery resource.
  • a device-to-device D2D discovery method includes:
  • the macro base station receives the D2D discovery authorization request initiated by the small base station, and acquires the device type information of the small base station that is carried by the D2D discovery authorization request, where the device type information of the small base station is different from the device type information of the user equipment UE;
  • the macro base station terminates the D2D discovery authorization process according to the device type information of the small base station, and returns a D2D discovery authorization response to the small base station, where the D2D discovery authorization response carries the D2D allocated by the macro base station to the small base station. Discover information about resources.
  • a method for energy saving of a small base station comprising:
  • the small base station initiates a D2D authorization request to the macro base station according to the manner as described above, acquires the D2D discovery resource allocated by the macro base station to the small base station, and discovers the resource according to the D2D discovery resource.
  • D2D discovery ;
  • the small base station performs a power saving decision according to the execution result of the D2D discovery.
  • a small base station includes a device-to-device D2D discovery module, and the D2D discovery module includes:
  • the authorization requesting unit is configured to send a D2D discovery authorization request to the macro base station, and acquire the D2D discovery resource allocated by the macro base station to the small base station;
  • a D2D execution unit is configured to perform D2D discovery according to the D2D discovery resource.
  • a macro base station includes a device-to-device D2D discovery processing module, and the D2D discovery processing module includes:
  • the authorization request processing module is configured to receive the D2D discovery authorization request initiated by the small base station, and obtain the device type information of the small base station carried by the D2D discovery authorization request, where the device type information of the small base station is different from the device of the user equipment UE Type information
  • the authorization response processing module is configured to terminate the D2D discovery authorization process according to the device type information of the small base station, and return a D2D discovery authorization response to the small base station, where the D2D discovery authorization response carries the macro base station as the small base station Information about the allocated D2D discovery resources.
  • a computer storage medium is further provided, and the computer storage medium may store an execution instruction for performing the implementation of the D2D discovery method in the foregoing embodiment.
  • the small base station can discover the UE and determine whether there is a non-connected UE in the cell. Therefore, the result of D2D discovery is used to close the decision, which greatly improves the effectiveness of the on/off decision.
  • FIG. 1 is a flowchart of a D2D discovery method on a small base station side according to an embodiment of the present invention
  • FIG. 2 is a block diagram of a small base station according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a D2D discovery method on a macro base station side according to Embodiment 2 of the present invention.
  • FIG. 4 is a block diagram of a macro base station according to Embodiment 2 of the present invention.
  • FIG. 5 is a flowchart of a method for saving power of a small base station according to Embodiment 3 of the present invention.
  • FIG. 6 is a block diagram of a small base station according to Embodiment 3 of the present invention.
  • FIG. 7 is a schematic diagram showing the positional relationship of a macro-heterogeneous network UE, a small base station, and a macro base station in an application example of the present invention
  • FIG. 8 is a signaling flowchart of a small base station and a macro base station D2D discovering an authorization request according to an example of the present invention
  • FIG. 10 is a signaling flowchart of detecting D2D discovery of a small base station by the UE when the third UE and the small base station are connected to different macro base stations according to the present invention
  • FIG. 11 is a signaling flowchart of a small base station detecting D2D discovery of a UE when the example four UEs and the small base station are connected to different macro base stations according to the present invention.
  • D2D is a communication device Point-to-point discovery and connectivity techniques.
  • D2D device discovery is the process by which a device identifies whether another device exists within a certain discovery distance.
  • the small base station and the UE should have the D2D discovery capability and enable the function; secondly, the UE and the small base station are in the macro base station coverage area, and the small base station and the macro base station have a wired or wireless connection.
  • the macro base station to which the UE is connected may be the same as or different from the macro base station to which the small base station is connected.
  • the D2D discovery method in this embodiment includes:
  • Step 110 The small base station sends a D2D discovery authorization request to the macro base station, and acquires a D2D discovery resource allocated by the macro base station to the small base station.
  • the D2D discovery authorization request sent by the small base station to the macro base station carries the device type information of the small base station, and the device type information of the small base station is different from the device type information of the UE.
  • the device type information of the small base station indicates that the small base station is different from the normal UE in the D2D discovery process, and the D2D discovery authorization for the small base station can be directly terminated in the macro base station, without the need to go to the core network side according to the IMSI.
  • the device type information of the small base station may be represented by a newly defined information unit, or may be represented by an invalid value or a reserved value of an existing information unit.
  • the meaning of the UE Identity IE can be extended (only the IMSI and MSISDN of the UE are specified in the protocol), for example, an invalid value can be used, and an IE can be newly defined.
  • the D2D discovery authorization request may further carry one or more of the following information: a D2D discovery capability, which is used to indicate that the small base station has a D2D active discovery capability; and a desired discovery distance, which is used to indicate the desired size of the small base station.
  • the maximum distance of the UE can be found.
  • the macro base station can configure the discovery signal power of the small base station according to the parameter, so as to control the UE to discover each other when the small base station can provide a better service range, and ignore the cell edge UE.
  • the small base station After receiving the D2D discovery authorization response returned by the macro base station, the small base station acquires, from the D2D discovery authorization response, the D2D discovery resource allocated by the macro base station to the small base station.
  • the D2D discovery resource may include one or more of the following resources: allocating the small base station a discovery signal; a transmission power specified for the small base station; and a discovery signal set detectable by the small base station.
  • the discovery signal and the transmission power are used to instruct the small base station to transmit the discovery signal according to the specified transmission power for detection by other UEs; the detectable discovery signal set is to inform the small base station to detect the UE in the specified discovery signal set.
  • Step 120 The small base station performs D2D discovery according to the D2D discovery resource.
  • the small base station may transmit a discovery signal for the UE to detect according to the allocated discovery signal and the transmission power, and actively detect the UE according to the detectable discovery signal set. If the discovery signal that does not belong to the discovery signal set is detected, the discovery signal is reported to the macro base station, and the UE information corresponding to the discovery signal returned by the macro base station is received.
  • the small base station is discovered by the UE, indicating that the UE has a discovery requirement, and thus a connection is established with the macro base station. Through the information transmission of the macro base station, the small base station can know that it has been discovered by the UE.
  • the embodiment also provides a small base station, including a device-to-device D2D discovery module.
  • the D2D discovery module includes:
  • the authorization requesting unit 10 is configured to send a D2D discovery authorization request to the macro base station, and acquire the D2D discovery resource allocated by the macro base station to the small base station;
  • the D2D execution unit 20 is configured to perform D2D discovery according to the D2D discovery resource.
  • the authorization request unit 10 includes:
  • a sending unit configured to send a D2D discovery authorization request to the macro base station, where the D2D discovery authorization request carries device type information of the small base station, where device type information of the small base station is different from device type information of the user equipment UE ;
  • a receiving unit configured to receive a D2D discovery authorization response returned by the macro base station, and obtain, by the D2D discovery authorization response, a D2D discovery resource allocated by the macro base station to the small base station.
  • the device type information of the small base station is represented by a newly defined information unit, or represented by an invalid value or a reserved value of an existing information unit.
  • the D2D discovery resource allocated by the macro base station to the small base station by the authorization requesting unit includes: a discovery signal allocated to the small base station, a transmission power specified by the small base station, and a detectable power of the small base station.
  • Discovery signal set
  • the D2D execution unit 20 includes:
  • a discovery signal transmitting unit configured to transmit a discovery signal for detection by the UE according to the allocated discovery signal and the transmission power
  • the discovery signal detecting unit is configured to actively detect the UE according to the detectable discovery signal set, and if the discovery signal that does not belong to the discovery signal set is detected, report the discovery signal to the macro base station, and receive the The UE information corresponding to the discovery signal returned by the macro base station.
  • the small base station can discover the UE in the non-connected state in the cell. This can be used as a basis for on/off decisions, avoiding unnecessary on-off transitions.
  • This embodiment provides a device-to-device D2D discovery method, which is applied to a macro base station, as shown in FIG. 3, and includes:
  • Step 210 The macro base station receives the D2D discovery authorization request initiated by the small base station, and acquires the device type information of the small base station carried by the D2D discovery authorization request, where the device type information of the small base station is different from the device type information of the user equipment UE. ;
  • the device type information of the small base station may be represented by a newly defined information unit, or may be represented by an invalid value or a reserved value of an existing information unit.
  • Step 220 The macro base station terminates D2D discovery according to device type information of the small base station.
  • the authorization process returns a D2D discovery authorization response to the small base station, where the D2D discovery authorization response carries information of the D2D discovery resource allocated by the macro base station to the small base station.
  • the small base station and the macro base station are grounded, that is, have a direct connection relationship, and the macro base station configures the adjacent small base station information, including the authorized information, in its own database in advance. Therefore, for the D2D discovery authorization request from the small base station, the macro base station performs verification on the small base station according to the authorization information configured by the database. There is no need to verify the UE registration information according to the IMSI to the core network side like a normal UE.
  • the embodiment also provides a macro base station, including a device-to-device D2D discovery processing module.
  • the D2D discovery processing module includes:
  • the authorization request processing module 40 is configured to receive the D2D discovery authorization request initiated by the small base station, and acquire the device type information of the small base station that is carried by the D2D discovery authorization request, where the device type information of the small base station is different from the user equipment UE Device type information;
  • the authorization response processing module 50 is configured to terminate the D2D discovery authorization process according to the device type information of the small base station, and return a D2D discovery authorization response to the small base station, where the D2D discovery authorization response carries the macro base station as the small Information about the D2D discovery resources allocated by the base station.
  • the device type information of the small base station is represented by a newly defined information unit, or represented by an invalid value or a reserved value of an existing information unit.
  • the macro base station can assist the small base station and the UE to implement the D2D discovery process, and perform appropriate processing for the D2D discovery authorization request of the small base station and the UE.
  • the embodiment provides a small base station energy-saving method based on D2D discovery. As shown in Figure 5, it includes:
  • Step 310 The small base station initiates a D2D authorization request to the macro base station, acquires the D2D discovery resource allocated by the macro base station to the small base station, and performs D2D discovery according to the D2D discovery resource.
  • the small base station determines that no user equipment UE is connected to the small base station, and may trigger the D2D authorization request.
  • the D2D discovery process may be implemented in the manner described in Embodiment 1, and details are not described herein again.
  • Step 320 The small base station performs a power saving decision according to the execution result of the D2D discovery.
  • the small base station performs a power saving decision according to the execution result of the D2D discovery, including one or more of the following:
  • Manner 1 The small base station performs D2D discovery, and if it is determined to find the UE or is discovered by the UE, it remains in an open state;
  • Manner 2 The small base station performs the D2D discovery. If it is determined that the UE is not found and is not found by the UE, the shutdown operation is performed when there is no current service processing. In mode 2, if the base station itself is still processing some other transient processes (such as when the UE actively accesses or switches over at this time), the execution command of the power-saving operation may be delayed or discarded.
  • the small base station provided in this embodiment includes a device-to-device D2D discovery module 1 and a power-saving determination module 2.
  • the D2D discovery module may adopt the D2D discovery module in the first embodiment, including the authorization request unit 10 and the D2D execution unit 20.
  • the authorization requesting unit 10 may initiate a D2D discovery authorization request to the macro base station when it is determined that no user equipment UE is connected to the small base station.
  • the power saving decision module 2 is configured to perform a power saving decision according to the execution result of the D2D discovery, including adopting one or more of the following ones: mode 1, if it is determined that the UE is found or discovered by the UE, the state is kept on; And mode 2, if it is determined that the UE is not found and is not found by the UE, the shutdown operation is performed when there is no current service processing.
  • the small base station may determine whether there is a non-connected UE in the cell based on the D2D discovery, and perform a shutdown decision according to whether there is a non-connected UE in the cell, such as shutting down in the absence of the non-connected UE. Improve the effectiveness of on/off decisions.
  • FIG. 7 is a diagram showing the positional relationship of a macro-heterogeneous network UE (UE1, UE2), a small base station (S1, S2), and a macro base station (M1, M2) in the following example.
  • UE1 and S1 are connected to the same macro base station
  • UE2 and S2 are respectively connected to two macro base stations M1 and M2.
  • This example relates to an authorization request procedure discovered by the small base station and the macro base station D2D.
  • the signaling flow shown in Figure 8. include:
  • Step S202 The small base station sends an authorization request for D2D discovery to the macro base station, and carries information such as D2D discovery capability, device type information of the small base station, and expected discovery distance.
  • Step S204 The small base station receives the D2D discovery authorization response replied by the macro base station, and includes a discovery signal, a transmission power, and a detectable discovery signal set allocated for the small base station.
  • This example relates to the D2D discovery procedure when the UE connects to the same macro base station as the small base station.
  • the signaling process shown in Figure 9 includes:
  • Step S302 UE1 and M1 perform an authorization request process for D2D discovery, which is a D2D discovery authorization process of a common UE;
  • Step S304 S1 and M1 perform an authorization request process of D2D discovery according to the signaling procedure shown in FIG. 8, which is a D2D discovery authorization process of the small base station;
  • Step S306 S1 and UE1 perform D2D discovery.
  • This example relates to the D2D discovery signaling procedure of the UE detecting the small base station when the UE and the small base station are connected to different macro base stations. As shown in Figure 10, it includes:
  • Step S402 The macro base stations M1 and M2 respectively acquire the discovery signal set of the other party through interaction, and form a route of the local discovery signal accordingly;
  • Step S404 S2 and M2 perform an authorization request process of D2D discovery of the small base station according to the signaling procedure shown in FIG. 8;
  • Step S406 UE2 and M1 perform an authorization request process for D2D discovery of a normal UE;
  • Step S408 UE2 detects the discovery signal, but identifies the discovery signal that is not the local cell, and reports it to M1;
  • Step S410 M1 transfers the discovery signal to M2 according to the route formed in step S402;
  • Step S412 M2 processes the discovery signal, confirms that it is valid and is S2, and returns the result to M1;
  • Step S414 M1 notifies UE2 that S2 has been found according to the feedback result of M2.
  • This example relates to the process of detecting the D2D discovery signaling of the UE by the small base station when the UE and the small base station are connected to different macro base stations. As shown in FIG. 11, the process may include the following processing steps:
  • Step S502 The macro base stations M1 and M2 respectively acquire the discovery signal set of the other party through interaction, and form a route of the local discovery signal accordingly;
  • Step S504 S2 and M2 perform an authorization request process of D2D discovery of the small base station according to the signaling procedure shown in FIG. 8;
  • Step S506 UE2 and M1 perform an authorization request process for D2D discovery of a normal UE;
  • Step S508 S2 detects the discovery signal, but identifies the discovery signal that is not the local cell, and reports it to M2;
  • Step S510 M2 transfers the discovery signal to M1 according to the route formed in step S502;
  • Step S512 M1 processes the discovery signal, confirms that it is valid and is UE2, and feeds the result back to M2;
  • Step S514 M2 informs S2 that UE2 has been found according to the feedback result of M1;
  • the small base station can be detected by the UE or can actively detect whether the UE in the range of its own interest exists, so that it can be determined according to whether or not the on state is turned off. It can be seen that the above example uses the D2D mutual discovery mechanism to detect the non-connected UE, and improves the effectiveness of the small base station on/off decision process, thereby saving the small base station energy consumption.
  • serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.
  • the foregoing embodiment method 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 better.
  • the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium (such as ROM/RAM, magnetic).
  • the disc, the optical disc includes a number of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.
  • the foregoing technical solution provided by the embodiment of the present invention may be applied to the D2D discovery process.
  • the foregoing solution may be used by the small base station to discover the UE and determine whether there is a non-connected UE in the cell. Therefore, the result of D2D discovery is used to close the decision, which greatly improves the effectiveness of the on/off decision.

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Abstract

本发明提供了一种设备到设备发现方法、小基站节能方法及小基站、宏基站，所述小基站向宏基站发送D2D发现授权请求，获取所述宏基站为所述小基站分配的D2D发现资源；所述小基站根据所述D2D发现资源执行D2D发现，并可以根据D2D发现的执行结果，进行省电判决。通过本申请，小基站可以发现UE，确定小区内是否存在非连接态UE。从而利用D2D发现的结果进行关闭判决，大大提高on/off决策的有效性。

Description

设备到设备发现方法、小基站节能方法及小基站、宏基站 技术领域
本发明涉及通信领域，具体而言，涉及一种设备到设备(D2D：Device to Device)发现方法、小基站节能方法及相应的小基站和宏基站。
背景技术
小基站(Small Cell)指从产品形态、发射功率、覆盖范围等方面，都相比传统宏基站站小得多的基站类型。从发射功率看，典型发射功率在100mW到5W之间；从重量看，普遍重量在2到10kg之间；从组网方式看，支持包括DSL/光纤/WLAN及蜂窝技术在内的多种技术的回传；而且还具备自动邻区发现、自配置等SON功能。经过统计分析，绝大多数的数据业务发生在室内或热点区域。相比宏基站，小基站可更加有效改善室内深度覆盖、增加网络容量、提升用户感知，因而越来越受到业界的关注。
小基站具有四类产品形态：第一种称为FemtoCell，主要用于家庭和企业环境中；第二种称为PicoCell，应用于室内公共场所如机场、火车站、购物中心等。第三种称为MicroCell，用于受限于占地无法部署宏基站的市区或农村；最后一种称为MetroCell，主要用于市区热点区域来降低容量瓶颈或农村。在热点地区增加小基站数可以有效提高小区容量以及减少覆盖空洞。然而，密集的小基站会增加小区间干扰、切换次数和信令交互、以及消耗更多的电力。因此，当某个小基站无容量覆盖需求或没有用户设备(User Equipment，UE)连接时可以关掉该小基站以节省能耗和降低干扰。
小基站处于开启(on)状态时，能够获取上行信道信息SRS(Sounding Reference Signal，信道探测参考信号)和信道状态指示信息/预编码指示/秩指示(CQI/PMI/RI)等信息，UE监听物理下行控制信道(Physical  Downlink Control Channel，PDCCH)并根据上下行调度信息在物理下行共享信道(Physical Downlink Shared Channel，PDSCH)上接收数据，在物理上行共享信道(Physical Uplink Shared Channel，PUSCH)上发送数据等一系列过程。当小基站中没有任何UE连接时，可以执行关闭操作以节省能耗和降低干扰。
由于小基站的覆盖面积较小，小区内无UE的概率非常大。但目前小基站在on状态时，如果仅仅根据连接态UE数目进行关闭策略，而忽略小区内非连接态UE，就可能造成不必要的on到off的转换，有效性较差。而目前标准中，并没有提供小基站发现UE的流程。
发明内容
有鉴于此，本发明实施例提供了以下技术方案。
一种设备到设备D2D发现方法，包括：
小基站向宏基站发送D2D发现授权请求，获取所述宏基站为所述小基站分配的D2D发现资源；
所述小基站根据所述D2D发现资源执行D2D发现。
一种设备到设备D2D发现方法，包括：
宏基站接收小基站发起的D2D发现授权请求，获取所述D2D发现授权请求携带的所述小基站的设备类型信息，所述小基站的设备类型信息不同于用户设备UE的设备类型信息；
所述宏基站根据所述小基站的设备类型信息终结D2D发现授权过程，向所述小基站返回D2D发现授权响应，所述D2D发现授权响应中携带所述宏基站为所述小基站分配的D2D发现资源的信息。
一种小基站的节能方法，包括：
小基站按照如上所述的方式向宏基站发起D2D授权请求，获取所述宏基站为所述小基站分配的D2D发现资源，并根据所述D2D发现资源执 行D2D发现；
所述小基站根据D2D发现的执行结果，进行省电判决。
一种小基站，包括设备到设备D2D发现模块，所述D2D发现模块包括：
授权请求单元，设置为向宏基站发送D2D发现授权请求，获取所述宏基站为所述小基站分配的D2D发现资源；
D2D执行单元，设置为根据所述D2D发现资源执行D2D发现。
一种宏基站，包括设备到设备D2D发现处理模块，所述D2D发现处理模块包括：
授权请求处理模块，设置为接收小基站发起的D2D发现授权请求，获取所述D2D发现授权请求携带的所述小基站的设备类型信息，所述小基站的设备类型信息不同于用户设备UE的设备类型信息；
授权响应处理模块，设置为根据所述小基站的设备类型信息终结D2D发现授权过程，向所述小基站返回D2D发现授权响应，所述D2D发现授权响应中携带所述宏基站为所述小基站分配的D2D发现资源的信息。
在本发明实施例中，还提供了一种计算机存储介质，该计算机存储介质可以存储有执行指令，该执行指令用于执行上述实施例中的D2D发现方法的实现。
通过上述方案，小基站可以发现UE，确定小区内是否存在非连接态UE。从而利用D2D发现的结果进行关闭判决，大大提高on/off决策的有效性。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是本发明实施例一小基站侧的D2D发现方法的流程图；
图2是本发明实施例一小基站的模块图；
图3是本发明实施例二宏基站侧的D2D发现方法的流程图；
图4是本发明实施例二宏基站的模块图；
图5是本发明实施例三小基站节能方法的流程图；
图6是本发明实施例三小基站的模块图；
图7是本发明应用示例中宏微异构网络UE、小基站以及宏基站的位置关系示意图；
图8是本发明示例一小基站与宏基站D2D发现授权请求的信令流程图；
图9是本发明示例二UE与小基站连接相同宏基站时D2D发现的信令流程图；
图10是本发明示例三UE与小基站连接不同宏基站时，UE检测小基站的D2D发现的信令流程图；
图11是本发明示例四UE与小基站连接不同宏基站时，小基站检测UE的D2D发现的信令流程图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚明白，下文中将结合附图对本发明的实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
实施例一
针对目前小基站不能确定小区内是否存在非连接态UE的问题，本实施例提供一种小基站和UE之间的D2D发现方法。D2D是一种通信设备 间点到点的发现和连接技术。D2D设备发现是一个设备识别在一定发现距离内是否存在另一个设备的过程。
要实现小基站和UE之间的D2D发现，小基站以及UE应具备D2D发现能力并开启该功能；其次，UE和小基站处于宏基站覆盖区域，小基站与宏基站存在有线或无线连接。UE连接的宏基站与小基站连接的宏基站可以相同，也可以不同。
如图1所示，本实施例D2D发现方法，包括：
步骤110，小基站向宏基站发送D2D发现授权请求，获取所述宏基站为所述小基站分配的D2D发现资源；
本步骤小基站向所述宏基站发送的D2D发现授权请求中携带所述小基站的设备类型信息，所述小基站的设备类型信息不同于UE的设备类型信息。小基站的设备类型信息表明在D2D发现过程中该小基站与普通的UE不同，对于小基站的D2D发现授权可以直接终结在宏基站，而无需像普通UE一样需要根据IMSI到核心网侧去校验UE注册信息。本实施例中，所述D2D发现授权请求中，所述小基站的设备类型信息可以用新定义的信息单元表示，也可以用已有信息单元的无效值或保留值表示。从3GPP29.345协议定义的IE来看，可以扩展UE Identity这个IE的含义(协议中只规定了使用UE的IMSI和MSISDN)，比如使用一个无效值，也可以新定义一个IE。
所述D2D发现授权请求中还可以携带有以下信息中的一种或多种：D2D发现能力，用于表示该小基站具备D2D主动发现能力；及期望发现距离，用于表示该小基站期望的能够发现UE的最大距离。宏基站可以根据该参数配置小基站的发现信号功率，以此控制当UE在小基站能提供较好服务范围内时才可以相互发现，忽略小区边缘UE。
所述小基站接收所述宏基站返回的D2D发现授权响应后，从所述D2D发现授权响应中获取所述宏基站为所述小基站分配的D2D发现资源。所述D2D发现资源可以包括以下资源中的一种或多种：为所述小基站分配 的发现信号；为所述小基站指定的发送功率；及所述小基站可检测的发现信号集合。其中的发现信号和发送功率用于指导小基站按指定的发送功率发射发现信号，以供其它UE检测；可检测的发现信号集合是告知小基站在指定发现信号集合内检测UE。
步骤120，所述小基站根据所述D2D发现资源执行D2D发现。
本步骤中，小基站可以根据分配的发现信号和发送功率，发射发现信号供UE检测，并根据可检测的发现信号集合主动检测UE。如果检测到不属于所述发现信号集合的发现信号时，将所述发现信号上报所述宏基站，并接收所述宏基站返回的所述发现信号对应的UE信息。
小基站被UE发现，说明UE有发现的需求，因此会与宏基站建立连接。通过宏基站的信息传递，小基站可以知道被UE发现了。
本实施例还提供了一种小基站，包括设备到设备D2D发现模块，如图2所示，所述D2D发现模块包括：
授权请求单元10，设置为向宏基站发送D2D发现授权请求，获取所述宏基站为所述小基站分配的D2D发现资源；
D2D执行单元20，设置为根据所述D2D发现资源执行D2D发现。
可选地，
所述授权请求单元10包括：
发送单元，设置为向所述宏基站发送D2D发现授权请求，所述D2D发现授权请求中携带所述小基站的设备类型信息，所述小基站的设备类型信息不同于用户设备UE的设备类型信息；
接收单元，设置为接收所述宏基站返回的D2D发现授权响应，从所述D2D发现授权响应中获取所述宏基站为所述小基站分配的D2D发现资源。
可选地，
所述发送单元发送的D2D发现授权请求中，所述小基站的设备类型信息用新定义的信息单元表示，或者用已有信息单元的无效值或保留值表示。
可选地，
所述授权请求单元获取的所述宏基站为所述小基站分配的D2D发现资源包括：为所述小基站分配的发现信号，为所述小基站指定的发送功率及所述小基站可检测的发现信号集合；
所述D2D执行单元20包括：
发现信号发射单元，设置为根据分配的发现信号和发送功率，发射发现信号供UE检测；
发现信号检测单元，设置为根据所述可检测的发现信号集合主动检测UE，如检测到不属于所述发现信号集合的发现信号时，将所述发现信号上报所述宏基站，并接收所述宏基站返回的所述发现信号对应的UE信息。
应用本实施例，小基站可以发现小区内非连接态的UE。进而可以作为on/off决策的依据，避免不必要的on到off的频繁转换。
实施例二
本实施例提供一种设备到设备D2D发现方法，应用于宏基站，如图3所示，包括：
步骤210，宏基站接收小基站发起的D2D发现授权请求，获取所述D2D发现授权请求携带的所述小基站的设备类型信息，所述小基站的设备类型信息不同于用户设备UE的设备类型信息；
本实施例中，所述D2D发现授权请求中，所述小基站的设备类型信息可以用新定义的信息单元表示，也可以用已有信息单元的无效值或保留值表示。
步骤220，所述宏基站根据所述小基站的设备类型信息终结D2D发现 授权过程，向所述小基站返回D2D发现授权响应，所述D2D发现授权响应中携带所述宏基站为所述小基站分配的D2D发现资源的信息。
小基站与宏基站是地面连接，即有直接的连接关系，宏基站会事先在自己的数据库中配置邻接的小基站信息，包括授权的信息。因此对于小基站过来的D2D发现授权请求，宏基站会根据数据库配置的授权信息对小基站进行校验。而无需像普通UE一样需要根据IMSI到核心网侧去校验UE注册信息。
本实施例还提供了一种宏基站，包括设备到设备D2D发现处理模块，如图4所示，所述D2D发现处理模块包括：
授权请求处理模块40，设置为接收小基站发起的D2D发现授权请求，获取所述D2D发现授权请求携带的所述小基站的设备类型信息，所述小基站的设备类型信息不同于用户设备UE的设备类型信息；
授权响应处理模块50，设置为根据所述小基站的设备类型信息终结D2D发现授权过程，向所述小基站返回D2D发现授权响应，所述D2D发现授权响应中携带所述宏基站为所述小基站分配的D2D发现资源的信息。
可选地，
所述授权请求处理模块接收的所述D2D发现授权请求中，所述小基站的设备类型信息用新定义的信息单元表示，或者用已有信息单元的无效值或保留值表示。
应用本实施例，宏基站可以协助小基站和UE实现D2D发现过程，同时针对小基站和UE的D2D发现授权请求而进行适当的处理。
实施例三
针对当前小基站on/off状态检测有效性问题，本实施例提供一种基于D2D发现的小基站节能方法。如图5所示，包括：
步骤310，小基站向宏基站发起D2D授权请求，获取所述宏基站为所述小基站分配的D2D发现资源，并根据所述D2D发现资源执行D2D发现；
本实施例中，小基站确定没有用户设备UE连接到本小基站时，可以触发D2D授权请求，D2D发现过程可以按照实施例一所述的方式实现，这里不再赘述。
步骤320，所述小基站根据D2D发现的执行结果，进行省电判决。
本实施例中，小基站根据D2D发现的执行结果，进行省电判决，包括以下一种或多判决方式：
方式一、所述小基站通过执行D2D发现，如确定发现UE或被UE发现，则保持在开启状态；
方式二、所述小基站通过执行D2D发现，如确定没有发现UE且没有被UE发现，则在当前无业务处理时，执行关闭操作。在方式二中，如果基站本身还在处理一些其他暂态流程(比如此时正好有UE主动接入或切换过来)，此时可以延迟或丢弃省电操作的执行命令
本实施例提供的小基站包括设备到设备D2D发现模块1和省电判决模块2，D2D发现模块可能采用实施例一中的D2D发现模块，包括授权请求单元10和D2D执行单元20。其中，授权请求单元10可以在确定没有用户设备UE连接到本小基站时，向宏基站发起D2D发现授权请求。
所述省电判决模块2，设置为根据D2D发现的执行结果，进行省电判决，包括采用以下一种或多判决方式：方式一，如确定发现UE或被UE发现，则保持在开启状态；及方式二，如确定没有发现UE且没有被UE发现，则在当前无业务处理时，执行关闭操作。
应用本实施例，小基站可以基于D2D发现确定小区内是否存在非连接态UE，并根据小区内是否存在非连接态UE进行关闭判决，如在不存在非连接态UE的情况下再关闭，大大提高on/off决策的有效性。
下面再用几个应用中的示例进行说明。
图7是以下示例中，宏微异构网络UE(UE1，UE2)、小基站(S1，S2)以及宏基站(M1,M2)的位置关系图。如图1所示，UE1与S1连接相同的宏基站，UE2与S2分别连接M1和M2两个宏基站。
示例一
本示例涉及小基站与宏基站D2D发现的授权请求流程。如图8所示的信令流程。包括：
步骤S202：小基站向宏基站发送D2D发现的授权请求，携带D2D发现能力、小基站的设备类型信息，期望的发现距离等信息；
步骤S204：小基站收到宏基站回复的D2D发现授权响应，包括为小基站分配的发现信号、发送功率及可检测的发现信号集合。
示例二
本示例涉及UE与小基站连接相同宏基站时的D2D发现流程。如图9所示的信令流程，包括：
步骤S302：UE1与M1执行D2D发现的授权请求过程，这是个普通UE的D2D发现授权流程；
步骤S304：S1与M1按图8所示的信令流程执行D2D发现的授权请求过程，这是小基站的D2D发现授权流程；
步骤S306：S1和UE1执行D2D发现。
示例三
本示例涉及UE与小基站连接不同宏基站时，UE检测小基站的D2D发现信令流程。如图10所示，包括：
步骤S402：宏基站M1和M2通过交互分别获取对方的发现信号集合，据此形成本地发现信号的路由；
步骤S404：S2与M2按图8所示的信令流程执行小基站的D2D发现的授权请求过程；
步骤S406：UE2与M1执行普通UE的D2D发现的授权请求过程；
步骤S408：UE2检测到发现信号，但识别是非本小区的发现信号，上报给M1；
步骤S410：M1根据步骤S402形成的路由将发现信号转给M2；
步骤S412：M2处理该发现信号，确认有效且为S2，将结果反馈给M1；
步骤S414：M1根据M 2的反馈结果，通知UE2已发现S2。
示例四
本示例涉及UE与小基站连接不同宏基站时，小基站检测UE的D2D发现信令流程。如图11所示，该流程可以包括以下处理步骤：
步骤S502：宏基站M1和M2通过交互分别获取对方的发现信号集合，据此形成本地发现信号的路由；
步骤S504：S2与M2按图8所示的信令流程执行小基站的D2D发现的授权请求过程；
步骤S506：UE2与M1执行普通UE的D2D发现的授权请求过程；
步骤S508：S2检测到发现信号，但识别是非本小区的发现信号，上报给M2；
步骤S510：M2根据步骤S502形成的路由将发现信号转给M1；
步骤S512：M1处理该发现信号，确认有效且为UE2，将结果反馈给M2；
步骤S514：M2根据M 1的反馈结果，通知S2已发现UE2；
根据上述示例描述的过程，小基站能够被UE检测到或者能主动检测到自己感兴趣范围内的UE是否存在，从而可以据此决定是否由on转入off状态。可以看出，上述示例利用D2D相互发现机制检测到非连接态UE，提高小基站on/off决策过程有效性，从而节省小基站能耗。
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。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上述实施例方法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，本发明实施例的技术方案本质上或者说对现有技术做出贡献的部分可以以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(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，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。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。
工业实用性
本发明实施例提供的上述技术方案，可以应用于D2D发现过程中，通过上述方案，小基站可以发现UE，确定小区内是否存在非连接态UE。从而利用D2D发现的结果进行关闭判决，大大提高on/off决策的有效性。

Claims (19)

  1. 一种设备到设备D2D发现方法，包括：
    小基站向宏基站发送D2D发现授权请求，获取所述宏基站为所述小基站分配的D2D发现资源；
    所述小基站根据所述D2D发现资源执行D2D发现。
  2. 如权利要求1所述的方法，其中：
    所述小基站向宏基站发送D2D发现授权请求，获取所述宏基站为所述小基站分配的D2D发现资源，包括：
    所述小基站向所述宏基站发送D2D发现授权请求，所述D2D发现授权请求中携带所述小基站的设备类型信息，所述小基站的设备类型信息不同于用户设备UE的设备类型信息；
    所述小基站接收所述宏基站返回的D2D发现授权响应，从所述D2D发现授权响应中获取所述宏基站为所述小基站分配的D2D发现资源。
  3. 如权利要求2所述的方法，其中：
    所述D2D发现授权请求中携带所述小基站的设备类型信息，包括：所述D2D发现授权请求中，所述小基站的设备类型信息用新定义的信息单元表示，或者用已有信息单元的无效值或保留值表示。
  4. 如权利要求2所述的方法，其中：
    所述D2D发现授权请求中还携带有以下信息中的一种或多种：
    D2D发现能力，用于表示该小基站具备D2D主动发现能力；
    期望发现距离，用于表示该小基站期望的能够发现UE的最大距离；
    所述D2D发现资源包括以下资源中的一种或多种：
    为所述小基站分配的发现信号；
    为所述小基站指定的发送功率；
    所述小基站可检测的发现信号集合。
  5. 如权利要求4所述的方法，其中：
    所述小基站根据所述D2D发现资源执行D2D发现，包括：
    所述小基站根据分配的发现信号和发送功率，发射发现信号供UE检测，并根据可检测的发现信号集合主动检测UE；
    所述小基站如检测到不属于所述发现信号集合的发现信号时，将所述发现信号上报所述宏基站，并接收所述宏基站返回的所述发现信号对应的UE信息。
  6. 一种设备到设备D2D发现方法，包括：
    宏基站接收小基站发起的D2D发现授权请求，获取所述D2D发现授权请求携带的所述小基站的设备类型信息，所述小基站的设备类型信息不同于用户设备UE的设备类型信息；
    所述宏基站根据所述小基站的设备类型信息终结D2D发现授权过程，向所述小基站返回D2D发现授权响应，所述D2D发现授权响应中携带所述宏基站为所述小基站分配的D2D发现资源的信息。
  7. 如权利要求6所述的方法，其中：
    所述D2D发现授权请求中携带所述小基站的设备类型信息，包括：所述D2D发现授权请求中，所述小基站的设备类型信息用新定义的信息单元表示，或者用已有信息单元的无效值或保留值表示。
  8. 一种小基站的节能方法，包括：
    小基站按照权利要求1-5中任一所述的方式，向宏基站发起D2D授权请求，获取所述宏基站为所述小基站分配的D2D发现资源，并根据所述D2D发现资源执行D2D发现；
    所述小基站根据D2D发现的执行结果，进行省电判决。
  9. 如权利要求8所述的方法，其中：
    所述小基站根据D2D发现的执行结果，进行省电判决，包括以下一种或多判决方式：
    所述小基站通过执行D2D发现，如确定发现UE或被UE发现，则保持在开启状态；
    所述小基站通过执行D2D发现，如确定没有发现UE且没有被UE发现，则在当前无业务处理时，执行关闭操作。
  10. 如权利要求8或9所述的方法，其中：
    所述小基站按照权利要求1-5中任一所述的方式，向宏基站发起D2D授权请求，包括：所述小基站确定没有用户设备UE连接到本小基站时，按照权利要求1-5中任一所述的方式，向宏基站发起D2D授权请求。
  11. 一种小基站，包括设备到设备D2D发现模块，所述D2D发现模块包括：
    授权请求单元，设置为向宏基站发送D2D发现授权请求，获取所述宏基站为所述小基站分配的D2D发现资源；
    D2D执行单元，设置为根据所述D2D发现资源执行D2D发现。
  12. 如权利要求11所述的小基站，其中：
    所述授权请求单元包括：
    发送单元，设置为向所述宏基站发送D2D发现授权请求，所述D2D发现授权请求中携带所述小基站的设备类型信息，所述小基站的设备类型信息不同于用户设备UE的设备类型信息；
    接收单元，设置为接收所述宏基站返回的D2D发现授权响应，从所述D2D发现授权响应中获取所述宏基站为所述小基站分配的D2D发现资源。
  13. 如权利要求12所述的小基站，其中：
    所述发送单元发送的D2D发现授权请求中，所述小基站的设备类型信息用新定义的信息单元表示，或者用已有信息单元的无效值或保留值表示。
  14. 如权利要求12所述的小基站，其中：
    所述授权请求单元获取的所述宏基站为所述小基站分配的D2D发现资源包括：为所述小基站分配的发现信号，为所述小基站指定的发送功率及所述小基站可检测的发现信号集合；
    所述D2D执行单元包括：
    发现信号发射单元，设置为根据分配的发现信号和发送功率，发射发现信号供UE检测；
    发现信号检测单元，设置为根据所述可检测的发现信号集合主动检测UE，如检测到不属于所述发现信号集合的发现信号时，将所述发现信号上报所述宏基站，并接收所述宏基站返回的所述发现信号对应的UE信息。
  15. 如权利要求11-14中任一所述的小基站，其中：
    所述小基站还包括：省电判决模块，设置为根据D2D发现的执行结果，进行省电判决。
  16. 如权利要求15所述的小基站，其中：
    所述省电判决模块进行省电判决，包括以下一种或多判决方式：
    如确定发现UE或被UE发现，则保持在开启状态；
    如确定没有发现UE且没有被UE发现，则在当前无业务处理时，执行关闭操作。
  17. 如权利要求11-14中任一所述的小基站，其中：
    所述授权请求单元向宏基站发送D2D发现授权请求，包括：所述授权请求单元确定没有用户设备UE连接到本小基站时，向宏基站发送D2D 发现授权请求。
  18. 一种宏基站，包括设备到设备D2D发现处理模块，所述D2D发现处理模块包括：
    授权请求处理模块，设置为接收小基站发起的D2D发现授权请求，获取所述D2D发现授权请求携带的所述小基站的设备类型信息，所述小基站的设备类型信息不同于用户设备UE的设备类型信息；
    授权响应处理模块，设置为根据所述小基站的设备类型信息终结D2D发现授权过程，向所述小基站返回D2D发现授权响应，所述D2D发现授权响应中携带所述宏基站为所述小基站分配的D2D发现资源的信息。
  19. 如权利要求18所述的宏基站，其中：
    所述授权请求处理模块接收的所述D2D发现授权请求中，所述小基站的设备类型信息用新定义的信息单元表示，或者用已有信息单元的无效值或保留值表示。
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