WO2011107056A2 - 切换过程中确定目标微蜂窝基站的方法和装置 - Google Patents

切换过程中确定目标微蜂窝基站的方法和装置 Download PDF

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WO2011107056A2
WO2011107056A2 PCT/CN2011/073073 CN2011073073W WO2011107056A2 WO 2011107056 A2 WO2011107056 A2 WO 2011107056A2 CN 2011073073 W CN2011073073 W CN 2011073073W WO 2011107056 A2 WO2011107056 A2 WO 2011107056A2
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base station
frequency
inter
terminal
micro
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PCT/CN2011/073073
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English (en)
French (fr)
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WO2011107056A3 (zh
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陶茂智
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华为技术有限公司
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Priority to CN201180000419.1A priority Critical patent/CN102172074B/zh
Priority to PCT/CN2011/073073 priority patent/WO2011107056A2/zh
Publication of WO2011107056A2 publication Critical patent/WO2011107056A2/zh
Publication of WO2011107056A3 publication Critical patent/WO2011107056A3/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point

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  • the present invention relates to CDMA (Code Division Multiple) Access, code division multiple access (AP), in the field of wireless communication technologies, and in particular, a method and apparatus for determining a target Femtocell (microcell base station) during terminal handover in the system.
  • CDMA Code Division Multiple
  • AP code division multiple access
  • PN Physical Network, pseudo-random code
  • PN_INC PN step increment
  • Femtocell is a kind of microcell base station (also known as a home base station or a 3G access point).
  • small wireless base stations Small
  • Small have been introduced in various wireless communication systems including CDMA systems based on mobile broadband and intelligent trends.
  • Cell its base station form is different from the currently widely deployed base station (currently widely deployed base stations are also referred to as femtocells as macrocell base stations), that is, in terms of specifications (number of users/transmitted power), volume, weight, etc. Both are an order of magnitude smaller than macrocell base stations.
  • Femtocells With the gradual application of Femtocell in CDMA wireless communication systems, hundreds of Femtocells may be deployed in the coverage of a macrocell base station (where the Femtocell space distribution may be a plane or a stereo layer such as a building). Since both the macro cell base station and the Femtocell need to allocate PNs, considering the factors such as the interval PN_INC and the Femtocell space distribution between the PNs may cause the PN to be insufficient and need to perform PN multiplexing.
  • the inventors have found that when the Femtocell multiplexes the same PN in the coverage of the macrocell base station, when the terminal switches from the macrocell base station to the target microcell base station in the coverage area, the following technical problems are brought about: The Femtocell multiplexing the same PN cannot determine which of the target Femtocells the terminal is switching.
  • an embodiment of the present invention provides a method and apparatus for determining a target microcell base station in a handover process.
  • a method for determining a target microcell base station in a handover process wherein a plurality of microcell base stations in a macrocell base station coverage area are configured with a pseudo pilot PN and an inter-frequency PN, and the base station subsystem stores the pseudo pilot of the microcell base station a correspondence table between the PN, the inter-frequency PN, and the identifier of the micro-cell base station, where the method specifically includes:
  • the base station subsystem receives the pseudo pilot PN of the micro cell base station reported by the terminal, and acquires the inter-frequency PN of the plurality of micro cell base stations corresponding to the pseudo pilot PN according to the correspondence table, and the multiple micro An inter-frequency PN of the cellular base station is sent to the terminal;
  • the base station subsystem Receiving, by the base station subsystem, the inter-frequency PN of the microcell base station that is determined to be reported after the terminal detects the terminal;
  • the base station subsystem acquires, according to the correspondence table, the identifiers of the micro-cell base stations corresponding to the pseudo-pilot PN and the inter-frequency PN reported by the terminal, to determine the target micro-cell base station that the terminal switches.
  • a method for determining a target microcell base station in a handover process comprising:
  • the terminal reports the pseudo pilot PN of the micro cell base station
  • the terminal receives the inter-frequency PN of the plurality of micro-cell base stations sent by the base station subsystem, and the inter-frequency PN of the plurality of micro-cell base stations is the pseudo-guided by the base station subsystem according to the micro-cell base station reported by the terminal
  • the frequency PN is obtained from a correspondence table between the pseudo pilot PN, the inter-frequency PN, and the microcell base station identifier;
  • the terminal Acquiring, by the terminal, the inter-frequency carrier of the micro-cell base station corresponding to the inter-frequency PN according to the inter-frequency PN of the plurality of micro-cell base stations, and performing inter-zone inter-frequency on the corresponding micro-cell base station according to the inter-frequency carrier Signal search
  • An apparatus for determining a target microcell base station in a handover process is set in a base station subsystem, where the apparatus specifically includes:
  • a configuration module configured to configure a pseudo pilot PN and an inter-frequency PN for each of the plurality of microcell base stations in the coverage of the macrocell base station, and to associate the pseudo pilot PN, the inter-frequency PN, and the identifier of the microcell base station of the microcell base station The table is saved;
  • a different frequency PN sending module configured to receive a pseudo pilot pseudo random code PN of the micro cell base station reported by the terminal, and acquire, according to the correspondence table, an inter-frequency PN of the plurality of micro cell base stations corresponding to the pseudo pilot PN Transmitting, by the plurality of microcell base stations, an inter-frequency PN to the terminal;
  • a target base station determining module configured to receive an inter-frequency PN of the micro-cell base station that is determined to be reported by the terminal, and obtain, according to the correspondence table, a micro-cell base station corresponding to the pseudo-pilot PN and the inter-frequency PN reported by the terminal.
  • the identifier identifies the target microcell base station for which the terminal is handed over.
  • the embodiment of the present invention sends a different frequency PN of multiple Femtocells corresponding to the pseudo pilot PN reported by the terminal to the terminal, and combines the pseudo pilot PN reported by the terminal. And the different frequency PN determines the target Femtocell of the terminal.
  • the target microcell base station capable of correctly identifying the terminal handover by the macrocell base station.
  • FIG. 1 is a flowchart of a method for determining a target Femtocell in a handover process according to Embodiment 1 of the present invention
  • FIG. 2 is a flowchart of a method for determining a target Femtocell in a handover process according to Embodiment 2 of the present invention
  • FIG. 3 is a schematic diagram of a scenario of an indoor Femtocell networking according to Embodiment 2 of the present invention.
  • FIG. 4 is a specific structural diagram of an apparatus for determining a target Femtocell in a handover process according to Embodiment 3 of the present invention.
  • FIG. 5 is a specific structural diagram of another apparatus for determining a target Femtocell in a handover process according to Embodiment 3 of the present invention.
  • This embodiment is applied to CDMA (Code Division Multiple) Access, Code Division Multiple Access (AP) communication system provides a method of determining a target Femtocell (microcell base station) during handover.
  • CDMA Code Division Multiple
  • AP Code Division Multiple Access
  • the base station subsystem includes a plurality of macro cell base stations and a base station controller, wherein a plurality of Femtocells can be deployed in the coverage of the macro cell base station, and the macro cell base station adopts a multi-carrier network.
  • a macrocell base station configures a PN, and multiple femtocells in the coverage of the macrocell base station are configured with an inter-frequency PN and a pseudo-pilot PN; wherein the pseudo pilot PN of the Femtocell is allocated and deployed together with the PN of the macrocell base station (allocation can be Considering multiplexing, Femtocell's inter-frequency PN can be self-planned.
  • the base station subsystem stores the identifiers of the pseudo pilot PN, the inter-frequency PN, and the Femtocell of the Femtocell (Cell A correspondence table of IDs, a pseudo pilot PN generally corresponding to a plurality of inter-frequency PNs. Further, in order to save the Femtocell baseband chip and the RF channel resources, the pseudo pilot of the Femtocell can be generally configured by using a "frequency hopping" mode.
  • the different frequency PNs corresponding to different pseudo pilot PNs may overlap each other or be different from each other.
  • This embodiment provides a method for determining a target Femtocell in a handover process, as shown in FIG. 1.
  • Step 11 The base station subsystem receives the PSMM message reported by the terminal (Pilot Strength Measurement). Message, pilot strength measurement message), the message carries a pseudo pilot PN of the Femtocell detected by the terminal.
  • the terminal may report the foregoing PSMM message in a triggering manner, for example, when detecting that the pseudo-pilot PN strength of the neighboring cell exceeds T_ADD, or the periodic detection mode is reported. There may be multiple pseudo pilot PNs of the reported Femtocell.
  • Step 12 The base station subsystem acquires the pseudo pilot PN of the Femtocell carried in the PSMM message, and acquires the inter-frequency PN of the multiple Femtocells corresponding to the pseudo pilot PN according to the correspondence table.
  • the base station subsystem may query the correspondence table between the pseudo pilot PN, the inter-frequency PN, and the Femtocell identifier of the Femtocell stored in the base station subsystem according to the pseudo pilot PN, and query and obtain the pseudo pilot PN from the correspondence table.
  • the correspondence table represents a logical correspondence, and the expression can be a logical expression such as a form/table/database.
  • Step 13 The base station subsystem sends the inter-frequency PN of the plurality of Femtocells to the terminal.
  • the plurality of inter-frequency PNs may be sent to the terminal in an inter-frequency neighboring manner.
  • Step 14 The base station subsystem receives the inter-frequency PN of the Femtocell that is determined by the foregoing terminal to detect the multiple inter-frequency PNs, and the base station subsystem acquires the pseudo-pilot PN and the inter-frequency reported by the terminal according to the correspondence table.
  • the identifier of the Femtocell corresponding to the PN is used to determine the target Femtocell of the terminal handover.
  • the terminal After receiving the message of the multiple-frequency PN sent by the base station subsystem, the terminal acquires the inter-frequency carrier corresponding to the Femtocell according to the multiple-frequency PN according to the multiple inter-frequency PN, and respectively pairs the corresponding Femtocell according to the inter-frequency carrier.
  • the inter-frequency inter-frequency signal search is performed, and the inter-frequency PN of the Femtocell corresponding to the highest-intensity inter-frequency signal is reported to the base station subsystem.
  • the pseudo-frequency PN and the inter-frequency PN are respectively set to the femtocell, and the inter-frequency PN of the multiple femtocell corresponding to the pseudo pilot PN reported by the terminal is sent to the terminal.
  • the terminal can be caused to perform neighbor cell inter-frequency signal search according to a plurality of inter-frequency PNs.
  • the base station subsystem combines the pseudo pilot PN and the inter-frequency PN reported by the terminal to identify the target Femtocell of the handover, and then triggers the terminal to switch to the target Femtocell.
  • the Femtocell networking of the uplink and downlink signal strength imbalance and the Femtocell networking of the "frequency hopping" pseudo pilot are applicable. .
  • This example uses the indoor Femtocell networking scenario shown in Figure 2 as an example.
  • the total number of inter-frequency PNs configured for Femtocells on floor n and floor n+1 is relatively large, and each Femtocell on floor n and floor n+1 respectively occupy different inter-frequency PNs.
  • the total number of pseudo pilot PNs is less configured, that is, less PN available resources are occupied, but the pseudo pilot PNs of adjacent Femtocells need to be different, and the adjacent Femtocells include horizontal planes.
  • the total number of inter-frequency PNs can be configured more, and the inter-frequency PN_INC can be set to 1.
  • the correspondence table between the pseudo pilot PN, the inter-frequency PN, and the Femtocell identifier of the multiple Femtocells provided in this embodiment is as shown in Table 1 below.
  • Femtocell CellID Pseudo pilot PN Inter-frequency PN 0x1000 A 1 0x1001 B 2 0x1002 C 3 0x1003 D 4 0x1004 E 5 0x1005 F 6 0x1006 G 7 0x1007 A 11 0x1008 B 12 0x1009 C 13 0x1010 D 14 0x1011 E 15 0x1012 A twenty one 0x1013 B twenty two 0x1014 C twenty three 0x1015 D twenty four 0x1016 E 25 0x1017 F 26 0x1018 G 27 0x1019 C 33 0x1020 D 34 0x1021 E 35 0x1022 F 36 0x1023 G 37
  • the total number of Femtocells is 37
  • the total number of pseudo pilot PNs is 7, and each of the pseudo pilot PNs is A, B, C, D, E, F, and G, respectively.
  • the seven pseudo pilot PNs It can be ensured that the pseudo pilot PNs of the Femtocells adjacent to each other are different from each other.
  • the total number of different frequency PNs is 37, which are 1-37.
  • the correspondence table of the identifiers of the pseudo-pilot PN, the inter-frequency PN, and the Femtocell of the plurality of Femtocells may be as shown in Table 2 below.
  • Femtocell CellID Pseudo pilot PN Inter-frequency PN 0x1000 A 1 0x1001 A 2 0x1002 A 3 0x1003 A 4 0x1004 A 5 0x1005 A 6 0x1006 A 7 0x1007 B 3 0x1008 B 4 0x1009 B 5 0x1010 B 6 0x1011 B 7 0x1012 B 8 0x1013 B 9 0x1014 C 6 0x1015 C 7 0x1016 C 8 0x1017 C 9 0x1018 C 10 0x1019 C 11 0x1020 C 12 0x1021 C 13 0x1022 C 14 0x1023 C 15
  • Step 31 The base station subsystem receives the PSMM message reported by the terminal, where the message carries the pseudo pilot PN of the Femtocell to be A.
  • the terminal in the active state passes the pseudo-pilot hard handover procedure and the macro-cell base station in the CDMA system switches to the Femtocell, the terminal detects that the pseudo-pilot signal strength of a certain femtocell exceeds the set threshold, and the terminal reports the carry The PSMM message of the pseudo pilot PN of one of the above Femtocells is sent to the macrocell base station.
  • the pseudo pilot PN of the above-mentioned Femtocell is A.
  • Step 32 The base station subsystem acquires a pseudo pilot PN of the Femtocell carried in the PSMM message, and obtains, according to the pseudo pilot PN: A, a plurality of inter-frequency PNs corresponding to the pseudo pilot PN: 1, 11 and 21.
  • the base station subsystem After receiving the foregoing PSMM message, the base station subsystem queries the corresponding relationship between the pseudo pilot PN, the inter-frequency PN, and the Femtocell identifier of the Femtocell shown in Table 1 according to the pseudo pilot PN:A carried in the PSMM message.
  • the pseudo pilot PN: A corresponds to a plurality of inter-frequency PNs, and the plurality of inter-frequency PNs are: 1, 11, and 21.
  • the identifiers of the corresponding Femtocells are: 0x1000, 0x1007, and 0x1012.
  • Step 33 The base station subsystem sends the queried plurality of inter-frequency PNs: 1, 11, and 21 as inter-frequency neighboring cells to the terminal.
  • Step 34 The base station subsystem receives the inter-frequency PN of the Femtocell reported by the terminal, and determines the target Femtocell of the terminal according to the pseudo pilot PN of the Femtocell reported by the terminal and the inter-frequency PN of the Femtocell: 0x1007.
  • the terminal acquires the inter-frequency carrier of each Femtocell according to the multiple inter-frequency PNs sent by the base station subsystem, that is, acquires the inter-frequency carriers of the Femtocells identified as: 0x1000, 0x1007, and 0x1012, respectively.
  • the terminal performs a neighboring inter-frequency signal search on the Femtocells identified as 0x1000, 0x1007, and 0x1012 according to the above-mentioned identifiers of the femtocells of the 0x1000, 0x1007, and 0x1012, respectively, and the Femtocell corresponding to the inter-frequency signal with the highest intensity
  • the inter-frequency PN is reported to the base station subsystem. For example, the inter-frequency signal of the Femtocell identified as 0x1007 has the highest intensity, and the inter-frequency PN of the Femtocell is 11, the terminal reports the inter-frequency PN:11 to the base station subsystem.
  • the base station subsystem combines the above-mentioned pseudo pilot PN:A and the inter-frequency PN:11 reported by the terminal, and queries the saved table 1 to locate the identifier of the unique target Femtocell: 0x1007.
  • the base station subsystem triggers a standard inter-frequency hard handover procedure, and the base station subsystem to the MSC (Mobile Switching)
  • the mobile switching center sends a handover request message carrying the identifier of the target femtocell: 11 after the MSC indicates that the target femtocell establishes a forward channel with the terminal, and the terminal switches to the target Femtocell.
  • the base station subsystem combines the pseudo pilot PN and the inter-frequency PN reported by the terminal to identify the target Femtocell, and then triggers the terminal to switch to the target Femtocell. Since the strengths of the downlink signals of the respective Femtocells are compared in the process of the handover determination and the target femtocell identification, the Femtocell networking of the uplink and downlink signal strength imbalance and the Femtocell networking of the "frequency hopping" pseudo pilot are applicable. .
  • An embodiment of the present invention provides a device for determining a target Femtocell in a handover process, where the device is disposed in a base station subsystem in a CDMA communication system, and the specific structure thereof is as shown in FIG. 4, and includes the following modules:
  • the configuration module 41 is configured to configure a pseudo pilot PN and an inter-frequency PN for each Femtocell in the coverage of the macrocell base station, and save the correspondence table between the pseudo pilot PN, the inter-frequency PN, and the Femtocell identifier of the Femtocell;
  • the inter-frequency PN sending module 42 is configured to receive the pseudo pilot PN of the Femtocell reported by the terminal, and acquire the inter-frequency PN of the multiple Femtocells corresponding to the pseudo pilot PN according to the correspondence table, and the multiple An inter-frequency PN of the Femtocell is sent to the terminal;
  • the target base station determining module 43 is configured to receive the inter-frequency PN of the Femtocell that is determined by the terminal, and obtain the identifier of the Femtocell corresponding to the pseudo pilot PN and the inter-frequency PN reported by the terminal according to the correspondence table. Determining a target Femtocell of the terminal handover.
  • the inter-frequency PN delivery module 42 may include:
  • the pseudo pilot PN receiving module 421 is configured to receive a PSMM message that is sent by the terminal and that carries a pseudo pilot PN of a certain Femtocell, where the PSMM message is that the terminal detects that the pseudo pilot signal strength of a certain Femtocell exceeds After the set threshold is sent to the base station subsystem or reported by the terminal after periodic detection;
  • the Query and Transmit Module 422 is configured to query, according to the pseudo pilot PN carried in the PSMM message, a correspondence table between the pseudo pilot PN, the inter-frequency PN, and the Femtocell identifier of the saved Femtocell, and acquire the pseudo-guide
  • the inter-frequency PN of the plurality of Femtocells corresponding to the frequency PN transmits the inter-frequency PN of the plurality of Femtocells to the terminal as an inter-frequency neighboring cell.
  • the target base station determining module 43 may include:
  • the inter-frequency PN receiving module 431 is configured to receive the inter-frequency PN of the Femtocell reported by the terminal, where the inter-frequency PN of the Femtocell is obtained by the terminal according to the inter-frequency PN of the multiple Femtocells sent by the base station subsystem.
  • the inter-frequency carrier of the Femtocell corresponding to the inter-frequency PN, the inter-frequency PN of the Femtocell corresponding to the inter-frequency signal of the highest-intensity inter-frequency signal after the inter-frequency signal is searched for the corresponding Femtocell;
  • a querying and determining module configured to query, according to the pseudo pilot PN of the Femtocell and the inter-frequency PN of the Femtocell, the corresponding relationship between the pseudo pilot PN, the inter-frequency PN, and the Femtocell identifier of the saved Femtocell a table, determining a target Femtocell of the terminal handover, and triggering the terminal to switch to the target Femtocell.
  • This embodiment also provides another identification device for determining a target Femtocell in a handover process.
  • the device is disposed in a terminal in a CDMA communication system, and its specific structure is as shown in FIG. 5, and includes the following modules:
  • the pseudo-pilot PN reporting module 51 is configured to report the pseudo pilot PN of the Femtocell to the base station subsystem, where the pseudo pilot PN can be carried by the PSMM message, where the PSMM message is that the terminal detects the pseudo-guide of a Femtocell After the frequency signal strength exceeds the set threshold, the terminal signal is sent to the base station subsystem or the terminal periodically reports and is reported;
  • the inter-frequency PN receiving module 52 is configured to receive the inter-frequency PN of the plurality of Femtocells sent by the base station subsystem, where the inter-frequency PN of the plurality of Femtocells is the pseudo-guided by the base station subsystem according to the Femtocell reported by the terminal
  • the frequency PN is obtained from a correspondence table of pseudo pilot PN, inter-frequency PN, and Femtocell identification;
  • the inter-frequency PN reporting module 53 is configured to acquire the inter-frequency carrier of the Femtocell corresponding to the inter-frequency PN according to the inter-frequency PN of the multiple femtocells, and perform the inter-zone inter-frequency signal search on the corresponding Femtocell according to the inter-frequency carrier Transmitting, by the base station subsystem, the inter-frequency PN of the Femtocell corresponding to the highest-frequency inter-frequency signal to the base station subsystem, so that the base station subsystem determines the target femtocell of the terminal handover according to the pseudo pilot PN and the inter-frequency PN reported by the terminal .
  • the storage medium may be a magnetic disk, an optical disk, or a read-only storage memory (Read-Only) Memory, ROM) or Random Access Memory (RAM).
  • the embodiment of the present invention sends a plurality of inter-frequency PNs corresponding to the pseudo pilot PN reported by the terminal to the terminal, and the terminal searches for the inter-frequency signal PN with the strongest signal to the base station subsystem through the inter-frequency neighboring cell.
  • the subsystem combines the last pseudo pilot PN and the current inter-frequency PN to identify the target Femtocell, and then triggers the terminal to switch to the target Femtocell. Therefore, the present invention can be applied to a Femtocell with an unbalanced uplink and downlink signal strength, and a Femtocell networking such as a "frequency hopping" pseudo pilot.
  • the PN available resources specified by the CDMA protocol can be saved, and the PN division is simple and intuitive.
  • the present invention can be implemented by hardware, or can be implemented by means of software plus necessary general hardware platform, and the technical solution of the present invention. It may be embodied in the form of a software product, which may be stored in a computer readable storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for making a computer device (may be A personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.
  • a computer readable storage medium which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.
  • a computer device may be A personal computer, server, or network device, etc.

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Abstract

本发明实施例提供了一种切换过程中确定目标微蜂窝基站（Femtocell）的方法和装置。该方法主要包括：基站子系统接收终端上报的微蜂窝基站的伪导频PN，根据所述对应关系表获取和所述伪导频PN对应的多个微蜂窝基站的异频PN，将所述多个微蜂窝基站的异频PN发送给所述终端，所述基站子系统接收所述终端检测后确定上报的微蜂窝基站的异频PN。所述基站子系统根据所述对应关系表获取所述终端上报的伪导频PN和异频PN所对应微蜂窝基站的标识以确定所述终端切换的目标微蜂窝基站。利用本发明实施例，能够使基站子系统正确识别终端的目标Femtocell，能够适用于上下行信号强度不平衡的Femtocell等场景。

Description

切换过程中确定目标微蜂窝基站的方法和装置
技术领域
本发明涉及CDMA（Code Division Multiple Access，码分多址接入）无线通信技术领域，尤其涉及一种在该系统内终端切换过程中确定目标Femtocell（微蜂窝基站）的方法和装置。
发明背景
在CDMA无线通信系统中，通常一个基站会分配一个PN（Pseudo Number，伪随机码），该PN用于识别不同基站的下行信号。按照CDMA协议规定，理论上最多有512个PN可用，但在实际应用中，为保证相邻基站的下行信号的正确解调，各PN之间需要间隔PN_INC（PN步长增量），例如在PN_INC为2、3或4的时候，相应地仅有256、171和118个PN可用。但随着通信系统网络规模扩大，广泛部署的基站对PN需求数也随之增加，要满足该需求则需允许间隔一定距离的基站可复用相同的PN。
Femtocell为一种微蜂窝基站（也被称作家庭基站或3G接入点），是近年来各无线通信系统包括CDMA系统基于移动宽带化、智能化趋势推出的小基站（Small Cell），其基站形态有别于当前广泛部署的基站（当前广泛部署的基站相对于Femtocell也被称之为宏蜂窝基站），即通常在规格（用户数/发射功率）、体积、重量等方面都较宏蜂窝基站小一个数量级。
随着Femtocell在CDMA无线通信系统中逐步应用，一个宏蜂窝基站覆盖范围内可能会部署有上百个Femtocell（其中Femtocell空间分布可以是平面，也可以是立体分层例如楼宇中）。由于宏蜂窝基站和Femtocell都需要分配PN，考虑各PN之间需要间隔PN_INC以及Femtocell空间分布等因素可能导致PN不够用而需要进行PN复用。
在实现本发明的过程中，发明人发现在宏蜂窝基站覆盖范围内出现Femtocell复用相同PN情况下，终端从宏蜂窝基站切换到覆盖范围内目标微蜂窝基站时会带来如下技术问题：多个Femtocell复用相同PN无法确定终端切换的目标Femtocell是哪一个。
发明内容
为解决上述技术问题，本发明实施例提供了一种切换过程中确定目标微蜂窝基站的方法和装置。
一种切换过程中确定目标微蜂窝基站的方法，宏蜂窝基站覆盖范围内多个微蜂窝基站均配置有伪导频PN和异频PN，基站子系统保存有所述微蜂窝基站的伪导频PN、异频PN和所述微蜂窝基站的标识的对应关系表，所述的方法具体包括：
所述基站子系统接收终端上报的微蜂窝基站的伪导频PN，根据所述对应关系表获取和所述伪导频PN对应的多个微蜂窝基站的异频PN，将所述多个微蜂窝基站的异频PN发送给所述终端；
所述基站子系统接收所述终端检测后确定上报的微蜂窝基站的异频PN；
所述基站子系统根据所述对应关系表获取所述终端上报的伪导频PN和异频PN所对应微蜂窝基站的标识以确定所述终端切换的目标微蜂窝基站。
一种切换过程中确定目标微蜂窝基站的方法，包括：
终端上报微蜂窝基站的伪导频PN；
所述终端接收基站子系统发送的多个微蜂窝基站的异频PN，所述多个微蜂窝基站的异频PN为所述基站子系统根据所述终端上报的所述微蜂窝基站的伪导频PN从伪导频PN、异频PN和微蜂窝基站标识的对应关系表中获取；
所述终端根据所述多个微蜂窝基站的异频PN获取所述异频PN对应的微蜂窝基站的异频载波，根据所述异频载波对所述对应的微蜂窝基站进行邻区异频信号搜索；
所述终端向所述基站子系统上报强度最大的异频信号所对应的微蜂窝基站的异频PN，以使得基站子系统根据所述终端上报的伪导频PN和异频PN确定所述终端切换的目标微蜂窝基站。
一种切换过程中确定目标微蜂窝基站的装置，设置在基站子系统中，所述装置具体包括：
配置模块，用于给宏蜂窝基站覆盖范围内多个微蜂窝基站均配置伪导频PN和异频PN，将微蜂窝基站的伪导频PN、异频PN和微蜂窝基站的标识的对应关系表进行保存；
异频PN下发模块，用于接收终端上报的微蜂窝基站的伪导频伪随机码PN，根据所述对应关系表获取和所述伪导频PN对应的多个微蜂窝基站的异频PN，将所述多个微蜂窝基站的异频PN发送给所述终端；
目标基站确定模块，用于接收所述终端检测后确定上报的微蜂窝基站的异频PN，根据所述对应关系表获取所述终端上报的伪导频PN和异频PN所对应的微蜂窝基站的标识以确定所述终端切换的目标微蜂窝基站。
由上述本发明的实施例提供的技术方案可以看出，本发明实施例通过将终端上报的伪导频PN对应的多个Femtocell的异频PN发送给终端，并结合终端上报的伪导频PN和异频PN确定终端的目标Femtocell。能够使宏蜂窝基站正确识别终端切换的目标微蜂窝基站。
附图简要说明
图1为本发明实施例一提供的一种在切换过程中确定目标Femtocell的方法流程图；
图2为本发明实施例二提供的一种在切换过程中确定目标Femtocell的方法流程图；
图3为本发明实施例二提供的一种室内Femtocell组网场景示意图；
图4为本发明实施例三提供的一种在切换过程中确定目标Femtocell的装置的具体结构图；
图5为本发明实施例三提供的另一种在切换过程中确定目标Femtocell的装置的具体结构图。
实施本发明的方式
下面将参考附图详细说明本发明实施例。
实施例一
本实施例应用于CDMA（Code Division Multiple Access，码分多址接入）通信系统，提供一种在切换过程中确定目标Femtocell（微蜂窝基站）的方法。
本实施例中，基站子系统包括多个宏蜂窝基站和基站控制器，其中宏蜂窝基站覆盖范围内可部署多个Femtocell，宏蜂窝基站采用多载波组网。通常一个宏蜂窝基站配置一个PN，该宏蜂窝基站覆盖范围内的多个Femtocell均配置有异频PN和伪导频PN；其中Femtocell的伪导频PN和宏蜂窝基站的PN一起分配部署（分配可考虑复用），Femtocell的异频PN可自主规划。基站子系统保存有Femtocell的伪导频PN、异频PN和Femtocell的标识（Cell ID）的对应关系表，一个伪导频PN通常对应多个异频PN。进一步的，为节省Femtocell基带芯片和射频通道资源，Femtocell的伪导频一般可采用“跳频”方式配置。
进一步的，不同伪导频PN所对应的异频PN可以互相重叠或者互不相同。
本实施例提供一种在切换过程中确定目标Femtocell的方法流程如图1所示。
步骤11、基站子系统接收终端上报的PSMM消息（Pilot Strength Measurement Message，导频强度测量消息），该消息携带有终端检测上报的Femtocell的伪导频PN。
其中，终端可触发方式上报上述PSMM消息，例如在检测到相邻小区伪导频PN强度超过T_ADD时上报；也可以周期性检测方式上报。其中上报的Femtocell的伪导频PN可能存在多个。
步骤12、基站子系统获取PSMM消息中携带的Femtocell的伪导频PN，根据对应关系表获取该伪导频PN对应的多个Femtocell的异频PN。
其中，基站子系统可以根据上述伪导频PN查询基站子系统中保存的Femtocell的伪导频PN、异频PN和Femtocell的标识的对应关系表，从对应关系表中查询获取该伪导频PN对应的多个异频PN。其中对应关系表表现的是一种逻辑对应关系，表现形式可以为表单/表格/数据库等逻辑表达形式。
步骤13、基站子系统将前述多个Femtocell的异频PN发送给前述终端。
其中，多个异频PN可以以异频邻区方式向前述终端发送。
步骤14、基站子系统接收前述终端对前述多个异频PN检测后确定上报的Femtocell的异频PN，基站子系统根据上述对应关系表获取所述终端上报的所述伪导频PN和异频PN所对应的Femtocell的标识以确定所述终端切换的目标Femtocell。
其中，终端在接收到基站子系统发送的包含多个异频PN的消息后，根据上述多个异频PN获取相应异频PN对应Femtocell的异频载波，根据该异频载波分别对对应的Femtocell进行邻区异频信号搜索，将强度最大的异频信号所对应的Femtocell的异频PN上报给基站子系统。
由上述实施例提供的技术方案可以看出，该实施例通过给Femtocell分别设置伪导频PN和异频PN，将终端上报的伪导频PN对应的多个Femtocell的异频PN发送给终端，可以使终端根据多个异频PN进行邻区异频信号搜索。基站子系统将终端上报的伪导频PN和异频PN结合在一起识别出切换的目标Femtocell，然后触发终端向目标Femtocell切换。由于在切换判断和目标Femtocell的识别过程中都是比较各个Femtocell的下行信号的强度，能够适用于上下行信号强度不平衡的Femtocell组网，以及“跳频”伪导频的Femtocell组网等场景。
实施例二
本实施例应用以图2所示的室内Femtocell组网场景为例。给楼层n和楼层n+1上的Femtocell分别配置7个伪导频PN，为A、B 、C、 D、 E、 F 和G，但是保证了相邻的Femtocell的伪导频PN不相同。给楼层n和楼层n+1上的Femtocell配置的异频PN的总数比较多，楼层n和楼层n+1上的每个Femtocell分别占用不同的异频PN。
在该实施例中，伪导频PN的总数配置的比较少，即占用比较少的PN可用资源，但是需要保证相邻的Femtocell的伪导频PN不相同，上述相邻的Femtocell包括水平平面上的左右相邻的Femtocell和不同垂直平面之间的上下相邻的Femtocell。而异频PN的总数可以配置的比较多，异频PN_INC可以设为1。
针对上述图2所示的室内Femtocell组网场景，该实施例提供的一种多个Femtocell的伪导频PN、异频PN和Femtocell的标识的对应关系表如下述表1所示，
表1
Femtocell CellID 伪导频PN 异频PN
0x1000 A 1
0x1001 B 2
0x1002 C 3
0x1003 D 4
0x1004 E 5
0x1005 F 6
0x1006 G 7
0x1007 A 11
0x1008 B 12
0x1009 C 13
0x1010 D 14
0x1011 E 15
0x1012 A 21
0x1013 B 22
0x1014 C 23
0x1015 D 24
0x1016 E 25
0x1017 F 26
0x1018 G 27
0x1019 C 33
0x1020 D 34
0x1021 E 35
0x1022 F 36
0x1023 G 37
如上述表1所示，Femtocell的总数为37，伪导频PN的总数为7，各个伪导频PN分别为A、B、C、D、E、F和G，该7个伪导频PN可以保证上下左右相邻的Femtocell的伪导频PN互不相同。异频PN的总数为37，分别为1-37。
当各个伪导频PN所对应的异频PN互相重叠时，上述多个Femtocell的伪导频PN、异频PN和Femtocell的标识的对应关系表可以如下述表2所示，
表2
Femtocell CellID 伪导频PN 异频PN
0x1000 A 1
0x1001 A 2
0x1002 A 3
0x1003 A 4
0x1004 A 5
0x1005 A 6
0x1006 A 7
0x1007 B 3
0x1008 B 4
0x1009 B 5
0x1010 B 6
0x1011 B 7
0x1012 B 8
0x1013 B 9
0x1014 C 6
0x1015 C 7
0x1016 C 8
0x1017 C 9
0x1018 C 10
0x1019 C 11
0x1020 C 12
0x1021 C 13
0x1022 C 14
0x1023 C 15
步骤31、基站子系统接收终端上报的PSMM消息，该消息携带有Femtocell的伪导频PN为A。
在处于激活态的终端通过伪导频硬切换流程，从CDMA系统中的宏蜂窝基站向Femtocell切换的过程中，终端检测到某个Femtocell的伪导频信号强度超过设定门限后，终端上报携带上述某个Femtocell的伪导频PN的PSMM消息给宏蜂窝基站。
在该实施例中，上述某个Femtocell的伪导频PN为A。
步骤32、基站子系统获取PSMM消息中携带的Femtocell的伪导频PN，根据该伪导频PN:A，获取该伪导频PN对应的多个异频PN: 1、11和21。
基站子系统接收到上述PSMM消息后，根据该PSMM消息中携带的伪导频PN:A查询上述表1所示的Femtocell的伪导频PN、异频PN和Femtocell的标识的对应关系，获取上述伪导频PN:A对应的多个异频PN，该多个异频PN为：1、11和21，分别对应的Femtocell的标识为：0x1000、0x1007和0x1012。
步骤33、基站子系统将查询到的上述多个异频PN: 1、11和21作为异频邻区下发给终端。
步骤34、基站子系统接收前述终端上报的Femtocell的异频PN，根据所述终端上报的Femtocell的伪导频PN和Femtocell的异频PN确定所述终端的目标Femtocell: 0x1007。
终端根据上述基站子系统下发的多个异频PN获取每个Femtocell的异频载波，即分别获取标识为：0x1000、0x1007和0x1012的Femtocell的异频载波。终端根据上述标识为：0x1000、0x1007和0x1012的Femtocell的异频载波，对标识为：0x1000、0x1007和0x1012的Femtocell分别进行邻区异频信号搜索，将强度最大的异频信号所对应的Femtocell的异频PN上报给基站子系统。比如，标识为0x1007的Femtocell的异频信号的强度最大，该Femtocell的异频PN为11，则终端将异频PN:11上报给基站子系统。
基站子系统将终端上报的上述伪导频PN:A和异频PN:11相结合，查询上述保存的表1，可定位到唯一的目标Femtocell的标识: 0x1007。
然后，基站子系统触发标准的异频硬切换流程，基站子系统向MSC（Mobile Switching Center，移动交换中心）发送携带上述目标Femtocell的标识:11的切换请求消息，MSC指示所述目标Femtocell建立和所述终端之间的前向信道后，所述终端切换到所述目标Femtocell。
由上述实施例提供的技术方案可以看出，该实施例针对室内Femtocell组网场景，伪导频PN的总数配置的比较少，即占用比较少的PN可用资源。基站子系统将终端上报的伪导频PN和异频PN结合在一起识别目标Femtocell，然后触发终端向目标Femtocell切换。由于在切换判断和目标Femtocell的识别过程中都是比较各个Femtocell的下行信号的强度，能够适用于上下行信号强度不平衡的Femtocell组网，以及“跳频”伪导频的Femtocell组网等场景。
实施例三
本发明实施例提供了一种切换过程中确定目标Femtocell的装置，该装置设置在CDMA通信系统中的基站子系统中，其具体结构如图4所示，包括如下的模块：
配置模块41，用于给宏蜂窝基站覆盖范围内多个Femtocell均配置伪导频PN和异频PN，将Femtocell的伪导频PN、异频PN和Femtocell的标识的对应关系表进行保存；
异频PN下发模块42，用于接收终端上报的Femtocell的伪导频PN，根据所述对应关系表获取和所述伪导频PN对应的多个Femtocell的异频PN，将所述多个Femtocell的异频PN发送给所述终端；
目标基站确定模块43，用于接收所述终端检测后确定上报的Femtocell的异频PN，根据所述对应关系表获取所述终端上报的伪导频PN和异频PN所对应的Femtocell的标识以确定所述终端切换的目标Femtocell。
具体而言，所述的异频PN下发模块42可以包括：
伪导频PN接收模块421，用于接收到所述终端上报的携带某个Femtocell的伪导频PN的PSMM消息，所述PSMM消息为所述终端检测到某个Femtocell的伪导频信号强度超过了设定的门限后向基站子系统发送的或者所述终端周期性检测后上报的；
查询和发送模块422，用于根据所述PSMM消息中携带的伪导频PN查询所述保存的Femtocell的伪导频PN、异频PN和Femtocell的标识的对应关系表，获取和所述伪导频PN对应的多个Femtocell的异频PN，将所述多个Femtocell的异频PN作为异频邻区发送给所述终端。
具体而言，所述的目标基站确定模块43可以包括：
异频PN接收模块431，用于接收所述终端上报的Femtocell的异频PN，所述Femtocell的异频PN为所述终端根据所述基站子系统发送的多个Femtocell的异频PN获取所述异频PN对应的Femtocell的异频载波，根据所述异频载波对对应的Femtocell进行邻区异频信号搜索后，强度最大的异频信号所对应的Femtocell的异频PN；
查询和确定模块，用于根据所述终端上报的所述Femtocell的伪导频PN和Femtocell的异频PN，查询所述保存的Femtocell的伪导频PN、异频PN和Femtocell的标识的对应关系表，确定所述终端切换的目标Femtocell，并触发所述终端切换到所述目标Femtocell。
该实施例还提供了另一种切换过程中确定目标Femtocell的识别装置，该装置设置在CDMA通信系统中的终端中，其具体结构如图5所示，包括如下的模块：
伪导频PN上报模块51，用于向基站子系统上报Femtocell的伪导频PN，上述伪导频PN可以通过PSMM消息来携带，所述PSMM消息为所述终端检测到某个Femtocell的伪导频信号强度超过了设定的门限后向基站子系统发送的或者所述终端周期性检测后上报的；
异频PN接收模块52，用于接收基站子系统发送的多个Femtocell的异频PN，所述多个Femtocell的异频PN为所述基站子系统根据所述终端上报的所述Femtocell的伪导频PN从伪导频PN、异频PN和Femtocell标识的对应关系表中获取；
异频PN上报模块53，用于根据所述多个Femtocell的异频PN获取所述异频PN对应的Femtocell的异频载波，根据所述异频载波对对应的Femtocell进行邻区异频信号搜索；向所述基站子系统上报强度最大的异频信号所对应的Femtocell的异频PN，以使得基站子系统根据所述终端上报的伪导频PN和异频PN确定所述终端切换的目标Femtocell。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体（Read-Only Memory，ROM）或随机存储记忆体（Random Access Memory，RAM）等。
综上所述，本发明实施例通过将终端上报的伪导频PN对应的多个异频PN发送给终端，终端通过异频邻区搜索上报信号最强的异频PN给基站子系统，基站子系统将上次的伪导频PN和本次异频PN结合在一起识别目标Femtocell，然后触发终端向目标Femtocell切换。因此，本发明能够适用于上下行信号强度不平衡的Femtocell，以及“跳频”伪导频的Femtocell组网等场景。
本发明实施例通过给Femtocell设置伪导频PN和异频PN，可以节约CDMA协议规定的PN可用资源，且PN划分简单直观。
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以通过硬件实现，也可以可借助软件加必要的通用硬件平台的方式来实现基于这样的理解，本发明的技术方案可以以软件产品的形式体现出来，该软件产品可以存储在一个计算机可读存储介质（可以是CD-ROM，U盘，移动硬盘等）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。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。

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  1. 切换过程中确定目标微蜂窝基站的方法，其特征在于，宏蜂窝基站覆盖范围内多个微蜂窝基站均配置有伪导频伪随机码PN和异频PN，基站子系统保存有所述微蜂窝基站的伪导频PN、异频PN和所述微蜂窝基站的标识的对应关系表，所述的方法具体包括：
    所述基站子系统接收终端上报的微蜂窝基站的伪导频PN，根据所述对应关系表获取和所述伪导频PN对应的多个微蜂窝基站的异频PN，将所述多个微蜂窝基站的异频PN发送给所述终端；
    所述基站子系统接收所述终端检测后确定上报的微蜂窝基站的异频PN；
    所述基站子系统根据所述对应关系表获取所述终端上报的伪导频PN和异频PN所对应微蜂窝基站的标识以确定所述终端切换的目标微蜂窝基站。
  2. 根据权利要求1所述的切换过程中确定目标微蜂窝基站的方法，其特征在于，所述的伪导频PN对应微蜂窝基站的伪导频载波，所述的异频PN对应微蜂窝基站的异频载波，所述的异频PN的总数大于所述伪导频PN的总数。
  3. 根据权利要求1所述的切换过程中确定目标微蜂窝基站的方法，其特征在于，所述终端上报的微蜂窝基站的伪导频PN通过导频强度测量消息携带。
  4. 根据权利要求3所述的切换过程中确定目标微蜂窝基站的方法，其特征在于，所述宏蜂窝基站的PN和所述宏蜂窝基站覆盖范围内多个微蜂窝基站的伪导频PN一起分配部署，所述宏蜂窝基站覆盖范围内多个微蜂窝基站的异频PN自主规划。
  5. 一种切换过程中确定目标微蜂窝基站的方法，其特征在于，包括：
    终端上报微蜂窝基站的伪导频伪随机码PN；
    所述终端接收基站子系统发送的多个微蜂窝基站的异频PN，所述多个微蜂窝基站的异频PN为所述基站子系统根据所述终端上报的所述微蜂窝基站的伪导频PN从伪导频PN、异频PN和微蜂窝基站的标识的对应关系表中获取；
    所述终端根据所述多个微蜂窝基站的异频PN获取所述异频PN对应的微蜂窝基站的异频载波，根据所述异频载波对对应的微蜂窝基站进行邻区异频信号搜索；
    所述终端向所述基站子系统上报强度最大的异频信号所对应的微蜂窝基站的异频PN，以使得基站子系统根据所述终端上报的伪导频PN和异频PN确定所述终端切换的目标微蜂窝基站。
  6. 根据权利要求5所述的切换过程中确定目标微蜂窝基站的方法，其特征在于，终端上报微蜂窝基站的伪导频PN通过导频强度测量消息携带。
  7. 一种切换过程中确定目标微蜂窝基站的装置，其特征在于，设置在基站子系统中，所述装置具体包括：
    配置模块，用于给宏蜂窝基站覆盖范围内多个微蜂窝基站均配置伪导频伪随机码PN和异频PN，将微蜂窝基站的伪导频PN、异频PN和微蜂窝基站的标识的对应关系表进行保存；
    异频PN下发模块，用于接收终端上报的微蜂窝基站的伪导频PN，根据所述对应关系表获取和所述伪导频PN对应的多个微蜂窝基站的异频PN，将所述多个微蜂窝基站的异频PN发送给所述终端；
    目标基站确定模块，用于接收所述终端检测后确定上报的微蜂窝基站的异频PN，根据所述对应关系表获取所述终端上报的伪导频PN和异频PN所对应的微蜂窝基站的标识以确定所述终端切换的目标微蜂窝基站。
  8. 根据权利要求7所述的切换过程中确定目标微蜂窝基站的装置，其特征在于，所述的异频PN下发模块包括：
    伪导频PN接收模块，用于接收所述终端上报的携带某个微蜂窝基站的伪导频PN的导频强度测量消息；
    查询和发送模块，用于根据所述导频强度测量消息中携带的伪导频PN查询所述保存的微蜂窝基站的伪导频PN、异频PN和微蜂窝基站的标识的对应关系表，获取和所述伪导频PN对应的多个微蜂窝基站的异频PN，将所述多个微蜂窝基站的异频PN作为异频邻区发送给所述终端。
  9. 根据权利要求7或8所述的切换过程中确定目标微蜂窝基站的装置，其特征在于，所述的目标基站确定模块包括：
    异频PN接收模块，用于接收所述终端上报的微蜂窝基站的异频PN，所述微蜂窝基站的异频PN为所述终端根据所述基站子系统发送的多个微蜂窝基站的异频PN获取所述异频PN对应的微蜂窝基站的异频载波，根据所述异频载波对对应的微蜂窝基站进行邻区异频信号搜索后，强度最大的异频信号所对应的微蜂窝基站的异频PN；
    查询和确定模块，用于根据所述终端上报的所述微蜂窝基站的伪导频PN和微蜂窝基站的异频PN，查询所述保存的微蜂窝基站的伪导频PN、异频PN和微蜂窝基站的标识的对应关系表，确定所述终端切换的目标微蜂窝基站，并触发所述终端切换到所述目标微蜂窝基站。
  10. 一种切换过程中确定目标微蜂窝基站的装置，其特征在于，设置在终端中，所述装置具体包括：
    伪导频PN上报模块，用于向基站子系统上报微蜂窝基站的伪导频PN；
    异频PN接收模块，用于接收基站子系统发送的多个微蜂窝基站的异频PN，所述多个微蜂窝基站的异频PN为所述基站子系统根据所述终端上报的所述微蜂窝基站的伪导频PN从伪导频PN、异频PN和微蜂窝基站的标识的对应关系表中获取；
    异频PN上报模块，用于根据所述多个微蜂窝基站的异频PN获取所述异频PN对应的微蜂窝基站的异频载波，根据所述异频载波对对应的微蜂窝基站进行邻区异频信号搜索；向所述基站子系统上报强度最大的异频信号所对应的微蜂窝基站的异频PN，以使得基站子系统根据所述终端上报的伪导频PN和异频PN确定所述终端切换的目标微蜂窝基站。
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