WO2010078747A1 - 一种家庭基站小区间的重选方法 - Google Patents

一种家庭基站小区间的重选方法 Download PDF

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Publication number
WO2010078747A1
WO2010078747A1 PCT/CN2009/072879 CN2009072879W WO2010078747A1 WO 2010078747 A1 WO2010078747 A1 WO 2010078747A1 CN 2009072879 W CN2009072879 W CN 2009072879W WO 2010078747 A1 WO2010078747 A1 WO 2010078747A1
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WO
WIPO (PCT)
Prior art keywords
cell
frequency
csg cell
csg
priority
Prior art date
Application number
PCT/CN2009/072879
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English (en)
French (fr)
Inventor
黄亚达
杜忠达
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to BRPI0918938-6A priority Critical patent/BRPI0918938B1/pt
Priority to KR1020117015608A priority patent/KR101344100B1/ko
Priority to EP09837305.3A priority patent/EP2360964B1/en
Priority to US13/140,416 priority patent/US8660089B2/en
Priority to JP2011541065A priority patent/JP5254464B2/ja
Priority to RU2011124747/07A priority patent/RU2483480C2/ru
Publication of WO2010078747A1 publication Critical patent/WO2010078747A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/04—Reselecting a cell layer in multi-layered cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • the present invention relates to a reselection technique between home base station cells, and more particularly to a method for reselecting a home base station and an interval in a wireless communication system.
  • BACKGROUND OF THE INVENTION In the construction of modern wireless network systems, indoor coverage has become a top priority in network construction. A suitable indoor coverage solution allows the network to maximize its role, thereby creating greater value for operators. On the one hand, it can greatly save the operator's network construction cost, and truly achieve high return on investment. At present, more and more multinational operators hope to provide a one-stop wireless access solution, which can provide various wireless access functions.
  • the home base station can skillfully combine the fixed network and the mobile network in private places such as homes, making full use of the advantages of fixed and mobile to satisfy users. And the needs of operators.
  • the home base station is a type of base station, and is used as a dedicated resource of a private user in a private place such as a home, a group, a company, or a school, and a plurality of cells covered by the home base station constitute a coverage area of the home base station.
  • the home base station Different from ordinary base stations that provide services to all users, the home base station only allows authorized users, such as family members, group members, and the like to access and provide services.
  • the cell under the home base station only provides services to a part of the authorized users. Therefore, the cell covered by the home base station is usually referred to as a CSG (Closed Subscriber Group) cell, that is, the home base station cell is a CSG cell.
  • the CSG cell indicates to the user terminal that the cell is a CSG cell by carrying a CSG indication in the broadcast message.
  • User terminals are classified into two types, one is a CSG user terminal that supports CSG capability, and the other is a Non-CSG user terminal that does not support CSG capability, and the Non-CSG user terminal does not reside in the CSG cell, but For a CSG user terminal, it can only reside in an authorized CSG cell, but not in an unlicensed CSG 'J, zone.
  • the CSG user terminal will store the identity of the resident CSG cell in a list of USIM cards, this list being referred to as a white list.
  • the CSG user terminal always confirms whether it can camp on the cell by looking up the cell identity of the cell in the white list.
  • the district When the CSG 'J, the district is extended to public places such as campus, factory, and park, it can also be operated in open mode or mixed mode. The purpose of allowing non-4 authorized user terminals to use the resources of the cell is achieved.
  • handover and cell reselection are extremely important components. Specifically, when the user terminal leaves one cell and enters another cell, the signal of the original cell received by the user terminal is It is getting weaker and weaker, and the signals it receives are getting stronger and stronger. In order to ensure the quality of the signal received by the user terminal, the user terminal must be switched from the original base station to the base station with a new incoming signal.
  • the conversion between the base stations is called handover, and for the user terminal in the idle state, the change of the resident terminal of the user terminal is completed by the cell reselection process, and the cell to be reselected is the target cell.
  • the detection is performed, and cell reselection is performed in the target cell that meets the requirements. Due to the cost advantage of the CSG cell, the load on the normal cell, that is, the macro cell, is greatly reduced, so the CSG user terminal supporting the CSG capability will reside on the authorized CSG cell as much as possible.
  • the CSG user terminal initiates a search for the CSG cell by manual or automatic means.
  • the network operator reserves a part of the physical resources, such as the physical cell identity (PCI, Physical Cell Identity), for the CSG cell to use, and notifies the CSG user terminal by broadcast or signaling.
  • the CSG user terminal can determine whether the cell is a CSG cell by scanning the physical layer. On the other hand, the quality of the signal received by the user terminal is completed by the measurement of the user terminal. In order to save the power consumption of the user terminal, the target cell to be measured is reduced as much as possible. In the modern wireless cellular system, the user terminal is re-selected between cells.
  • One of the measurement strategies is a frequency measurement based cell measurement strategy. When planning the cell network, the operator divides all frequencies into several groups, and each group is assigned a priority.
  • Each cell broadcasts the priority of its own frequency and the priority of the frequency of the neighboring cell.
  • the user terminal is required to reside as much as possible on a higher priority frequency.
  • the cell measurement rule based on the frequency priority of the user terminal is: First, periodic measurement is performed on the neighboring cell on the frequency higher than the priority of the camping cell frequency. Secondly, the measurement for the intra-frequency neighboring cell is only enabled when the signal quality of the serving cell is lower than the threshold, otherwise the user terminal may not perform measurement. Finally, the measurement is started only when the monthly cell signal quality is at the threshold value for the neighboring cell on the frequency of the priority of the resident frequency or the same priority, otherwise the user terminal may not measure.
  • the prior art that is, the priority-based reselection method, includes two aspects.
  • a reselection condition is involved, and the reselection condition is: S n of a cell on the measured frequency point.
  • nServingCell the value of x is within the Treselection RAT time ⁇ p is greater than the threshold Thresh X; high arriving where x represents the frequency to be measured, nonServingCell represents the measured cell, S n .
  • nSCTvin g Cell x represents the cell selection of the measured cell Receive level value
  • TreselectionRAT indicates cell reselection measurement time
  • Thresh x high indicates reselection threshold to high priority frequency point.
  • the priority-based reselection method specifically includes the following steps: Step 101: If a cell in a high priority frequency point satisfies the reselection condition, and the user terminal has camped for more than 1 second in the current camping cell, Then reselect to the cell.
  • step 101 is for a cell of a high priority frequency point, and reselection can be implemented as long as it satisfies the reselection condition.
  • Step 102 When there is no reselectable cell in the camping frequency point, and no high priority frequency cell meets the reselection condition, the measurement level S ServingCell of the camped cell is lower than the threshold.
  • nServingCeU when the value of x is greater than the threshold Threshxjcw in the Treselection RAT time, it is reselected to the cell.
  • the frequency point to be measured represented by x is specifically the frequency point of the low priority to be measured, S n .
  • the cell selection reception level value of the measured cell indicated by nServingCell , x is specifically the measurement level value of the measured cell, and the Treselection RAT indicates the cell reselection measurement time.
  • Threshservingjow indicates the resident cell low threshold
  • Threshxj indicates that the threshold is reselected to the priority frequency.
  • step 102 is mainly for the case of a cell without a high priority frequency point and a cell without the same priority frequency point, and the purpose of implementing the reselection is to perform reselection to the cell of the higher priority frequency point.
  • Step 103 Perform reselection by intra-cell reselection according to the offset-based cell reselection method for the intra-frequency cell and the same-priority frequency point.
  • step 103 is for the case where the cells of the same priority frequency point are in the same frequency or different frequency, and can also be understood to implement the reselection by using the offset based cell reselection method for multiple cells.
  • Step 104 When multiple cells in a frequency point or multiple frequency points of the same priority satisfy the reselection condition, the user terminal selects the best cell as the target cell for reselection.
  • step 104 is also for multiple cells, and the best cell is selected to implement reselection. It should be noted that the focus of steps 101 to 104 is different. Steps 101 and 102 focus on how to select a cell, and steps 103 and 104 focus on how to further select a cell when a cell has been selected.
  • Step 101, step 102 and step 103 constitute a reselection solution
  • step 101, step 102 and step 104 may also constitute a reselection solution.
  • the choice of the best cell in a frequency is an offset based ordering method.
  • equency is the offset of the cell level another ' J , Qoffsetfi. equency is the frequency level offset.
  • the user terminal sorts all R values, and the first one is the best cell, and the user terminal reselects to the best cell. Because of the difficulty of reselection of the neighboring cell, in addition to the radio quality of the cell, it depends on the value of Qoffset, so this method is also called the offset-based cell reselection method. Since the setting of the CSG cell is unpredictable for the macro cell, that is, when the macro cell is planning the network, it is impossible to know how many CSG cells exist in the neighboring cell, and at which frequency points these CSG cells are located.
  • the CSG cell may appear at any allowed frequency, possibly at the frequency of the neighboring cell of the macro cell, or it may be an additional separate frequency. If the CSG user terminal is still reselected according to the above priority-based reselection method, when the frequency of the CSG cell happens to be the same priority or the low priority frequency, the CSG user terminal is more difficult to reselect to the CSG cell. Therefore, for the CSG cell, a set of re-election rules is also specified, as shown below.
  • the CSG user terminal searches for the CSG cell through automatic search, if found A suitable CSG cell, and the CSG cell is the cell with the best radio quality at its frequency point, and the CSG user terminal can reselect to the CSG cell regardless of the original priority of the frequency.
  • This reselection rule is also known as an implicit priority rule.
  • the user terminal When the CSG user terminal camps on a suitable CSG cell, the user terminal considers that the frequency priority of the CSG is the highest priority, and the user terminal reselects the cell according to the above priority-based reselection method when the cell is reselected. In this way, according to the measurement rule of the frequency priority-based cell of the above user terminal, when the user terminal camps on the CSG cell, when the cell radio signal quality is higher than the same-frequency and inter-frequency measurement threshold, the CSG user terminal does not do Any other measurements. Through such processing 4. The power consumption of the user terminal in the standby state is greatly reduced.
  • the CSG user terminal when the CSG user terminal camps on the CSG cell, the CSG user terminal considers that the frequency of the cell is the highest, which is higher than the priority of any adjacent frequency. This leads to two problems: First, because the CSG user terminal considers that the frequency of its own frequency has the highest priority, it is difficult to reselect the CSG cell at the other frequency. Second, since the user terminal follows the above priority-based reselection method when the user terminal camps on the CSG cell, the CSG cell on the frequency point is caused after the frequency priority is set in the cell broadcast. There are different priorities.
  • each has its own priority, and the default own priority is the highest priority, and the above priority-based reselection method is based on the highest priority.
  • the method of reselecting is performed from high to ⁇ 4 unordered, and the purpose is to reselect the user terminal to the target cell where the highest priority frequency is located. Therefore, with the prior art reselection strategy, it is difficult to effectively implement reselection, thus resulting in poor signal quality of the user terminal.
  • the reselection strategy of the prior art is difficult to effectively implement reselection, which may result in poor signal quality of the user terminal.
  • the main purpose of the present invention is to provide a method for reselecting cells between home base stations to ensure CSG.
  • the cells are equal in status, and the source CSG cell has the same priority as the target CSG cell to be reselected, thereby effectively implementing reselection and achieving the purpose of enhancing the signal quality of the user terminal.
  • a method of reselection between cells of a home base station is provided.
  • the method for reselecting a home base station and an interval according to the present invention includes: the user terminal camps on a non-public authorized user group CSG cell; and when the user terminal reselects from the currently camping source CSG cell to the target CSG cell, the source CSG cell is enabled.
  • both the source CSG cell and the target CSG cell allow the user terminal to camp; the source CSG cell and the target CSG cell both include: a CSG cell that belongs to the white list of the user terminal, or a CSG cell that allows the unauthorized user terminal to enter.
  • the CSG identity of the source CSG cell and the target CSG cell are the same or different.
  • the user terminal comprises: a CSG user terminal supporting CSG capability.
  • the frequency at which the target CSG cell is located is: other frequencies different from the frequency at which the source CSG cell is located.
  • the frequency priority of the target CSG cell is: a frequency reselection priority broadcast by the source CSG cell currently camped on by the user terminal.
  • the method of setting the frequency priority by setting the frequency priority to the source CSG cell and the target CSG cell is specifically: setting the source CSG cell and the target CSG cell to have the same frequency priority
  • the frequency priority is set on the basis of the same frequency priority and the frequency priority of the other frequencies is higher.
  • the other frequencies are: Excluding the frequency of the source CSG cell and the frequency of the target CSG cell.
  • Other frequencies can also be understood as the frequency at which there is no CSG cell on the frequency or the frequency at which the CSG cell on the frequency does not satisfy the reselection condition.
  • the reselection is performed by: reselecting the user terminal from the source CSG cell to the target CSG cell by using the reselection mode of the offset based cell to complete the reselection.
  • the method of the present invention includes: the user terminal camps on the CSG cell; when the user terminal reselects from the currently camping source CSG cell to the target CSG cell, sets the frequency priority, and makes the source CSG cell and the target CSG cell have the same Frequency priority, reselecting the user terminal from the source CSG cell to the target CSG cell.
  • the present invention ensures that the CSG cells are equal in status, and the source CSG cell has the same priority as the target CSG cell to be reselected, and the priority is the frequency priority, by adopting the changed reselection policy and the above.
  • the pre-selection re-election method achieves effective re-election to achieve the purpose of enhancing the signal quality of the user terminal. That is to say, it is solved that the CSG cell in which the user terminal camps in the above-mentioned priority-based reselection method cannot ensure the same priority of the CSG small-area, so that the equally accessible CSG cells have the same priority.
  • FIG. 1 is a flowchart of a method for reselecting a home base station' and a section according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of priority reselection according to an example of the present invention
  • FIG. 3 is an example of reselection according to priority of the present invention.
  • the present invention provides a method for reselecting cells between cells of a home base station, considering that the reselection strategy of the prior art is difficult to effectively implement reselection, which may result in poor signal quality of the user terminal.
  • the frequency priority is set, and the source CSG cell and the target CSG cell have the same frequency priority, and the user terminal is reselected from the source CSG cell to the target. On the CSG cell.
  • FIG. 1 is a flowchart of a method for reselecting a cell between cells of a home base station according to an embodiment of the present invention.
  • the method includes the following steps 101 to 103: Step 101: A user terminal camps on a CSG cell; A CSG cell is a home base station cell. Step 102: It is found that the CSG cell at one frequency point satisfies the reselection condition, so that the source CSG cell and the target CSG cell have the same frequency priority.
  • the source CSG cell and the target CSG cell are both included: a CSG cell that belongs to the white list of the user terminal, or a CSG cell that allows the unauthorized user terminal to enter, for example, the user terminal is authorized to enter in an open mode.
  • CSG cell That is to say, the source CSG 'J, the area and the target CSG cell type may be a CSG cell in the white list of the user terminal, or may be a CSG cell that any user terminal can be authorized to enter.
  • the CSG identifiers of the source CSG cell and the target CSG cell may be the same or different.
  • the user terminal includes: a CSG user terminal that supports CSG capability.
  • the frequency at which the target CSG cell is located is: other frequencies different from the frequency at which the source CSG cell is located. That is to say, the other frequencies are ⁇ ⁇ except the frequency at which the source CSG cell is located.
  • the frequency priority of the target CSG cell is: the frequency reselection priority broadcast by the source CSG cell currently camped on by the user terminal. It should be noted that when the user terminal camps on the CSG cell, when the user terminal wants to reselect the target CSG cell on another frequency, the user terminal considers that the source CSG cell has the same frequency priority as the target CSG cell, and Regardless of the original frequency priority of the target CSG cell.
  • the original frequency priority of the target CSG cell is: the frequency priority of the target CSG cell involved here.
  • the method of setting the frequency priority to the source CSG cell and the target CSG cell may be implemented by setting the frequency priority.
  • the setting of the frequency priority is specifically: setting the source CSG cell and the target CSG cell to have the same frequency priority.
  • the frequency priority is set on the basis of the same frequency priority and the frequency priority of the other frequencies is higher.
  • the other frequencies here are: Excluding the frequency of the source CSG cell and the frequency other than the frequency of the target CSG cell.
  • the other frequencies herein can also be understood as the frequency at which there is no CSG cell in frequency or the frequency at which the CSG cell on the frequency does not satisfy the reselection condition.
  • Step 103 Complete reselection, such as reselecting the user terminal from the source CSG cell to the target CSG cell.
  • the above-mentioned existing priority-based reselection method is adopted by reselecting the user terminal from the source CSG cell to the target CSG cell.
  • the present invention changes the reselection strategy relative to the prior art.
  • the changed reselection strategy is: Ensure that the CSG cells are equal in status, and the source CSG cell has the same priority as the target CSG cell to be reselected.
  • the priority is the frequency priority, by adopting the changed weight.
  • the selection strategy and the priority-based reselection method enable efficient reselection.
  • ⁇ ) re-selecting the user terminal from the source CSG cell to the target CSG 'J the area may be specifically: using the offset-based cell reselection mode to complete the reselection.
  • Example 1 This example is based on the schematic diagram of priority reselection as shown in FIG. 2. The CSG cell in Figure 2 is indicated by a left slash fill.
  • the CSG user terminal resides on the CSG cell H-al of the frequency A, and obtains the priorities F-b and F-c of the other two frequencies B and C by broadcasting, and the priority order is F-a > F_b > F- c.
  • the frequency point C searches for the CSG cell H_cl and the macro cell M_cl by scanning the PCI reserved by the CSG.
  • H al and H- cl belong to the same CSGs with the same CSG logo.
  • the CSG identity can be found in the white list of the user terminal. Since the CSG user terminal resides on H-al, the priority of the frequency is considered to be the highest priority.
  • H-al and H-cl have the same frequency priority, and after sorting according to the offset-based cell reselection method, if R H _ci>RH-ai is satisfied within the Treselection time, the CSG user The terminal reselects to the CSG cell H- cl.
  • Example 2 This example is based on the prioritized reselection diagram shown in FIG. 2. The CSG cell in Figure 2 is indicated by a left slash fill.
  • the CSG user terminal resides on the CSG cell H-al of the frequency A, and obtains the priorities F-b and F-c of the other two frequencies B and C by broadcasting, and the priority order is F-a > F_b > F- c.
  • the CSG user terminal searches for the macro cell M_bl on the frequency B
  • the frequency point C searches for the CSG cell H_cl and the macro cell M_cl by scanning the PCI reserved by the CSG.
  • H al and H- cl belong to the same CSG and have the same CSG identity.
  • the CSG identity can be found in the white list of the user terminal.
  • the priority of the frequency is considered to be the highest priority, considered to be F-a, and greater than the existing defined priority, F-a, >F-a> F- b>F- c.
  • H_cl becomes the best cell on frequency C
  • the CSG user terminal lists H-cl as a cell that can be reselected.
  • H-al and H-cl have the same frequency priority, and after sorting according to the offset-based cell reselection method, if R H _ci>R H -ai is satisfied in the Treselection time, CSG The user terminal reselects to the CSG cell H-cl.
  • Example 3 This example is based on the prioritized reselection diagram shown in FIG. The CSG cell in Figure 3 is indicated by a left slash fill. The CSG user terminal resides on the CSG cell H-al of the frequency A, and another frequency B is obtained by broadcasting, and the priority order is set to F-b>F-a by default.
  • the CSG user terminal also finds another frequency point C, but the C frequency point is not broadcast on Hal.
  • the CSG user terminal also searches for the macro cell M_al on the frequency A
  • the macro cell M_M is searched on the frequency B
  • the frequency point C searches for the CSG cell H_cl and the macro cell M_cl.
  • H-al and H-cl belong to different CSGs and have different CSG identifiers. Both CSG IDs can be found in the white list of the user terminal. Since the CSG user terminal resides on H-al, the priority of the frequency is reset to F-a, and F-a, >F-b.
  • the CSG user terminal lists H-cl as being reselectable.
  • the frequency C priority becomes the highest at this time, and is set to F-c, and F-a, which are equal.
  • F— a, F— c,>F— b, according to the re-election rule, the frequencies of H-al and H-cl are the same, and the cell based on the offset-based reselection method is not sub-ordered.
  • H-al Broadcasting frequency A reselection time Treselection, if R H _ci>R H -ai is satisfied within the Treselection time, the CSG user terminal reselects to the CSG cell H- cl.
  • the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module.

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  • Computer Networks & Wireless Communication (AREA)
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一种家庭基站小区间的重选方法
技术领域 本发明涉及家庭基站小区间的重选技术，尤其涉及一种无线通信系统中 家庭基站 、区间的重选方法。 背景技术 在现代无线网络系统建设中， 室内覆盖已经成为网络建设的重中之重， 合适的室内覆盖方案一方面可以让网络最大程度地发挥其作用 , 从而为运营 商创造更大的价值， 另一方面可以大大节省运营商的建网成本， 真正实现氐 投入高回报。 目前， 越来越多的跨国运营商希望能够提供一种一站式的无线 接入方案， 这种无线接入设备能够提供各种无线接入的功能， 用户在家里使 用该设备时， 运营商可以提供资费上的优惠， 在这样的需求基础上， 应运产 生了一种新型的无线接入设备， 即家庭基站。 家庭基站作为一种新型无线接 入设备的接入解决方案， 可以把诸如家庭等私人场所中的固网和移动网这两 种通信方式巧妙地结合起来， 充分利用固定和移动的优势来满足用户和运营 商的需求。 家庭基站是基站的一种， 其作为私人用户的专属资源被部署在家庭、 团 体、 公司或者是学校等私人场所中使用， 家庭基站覆盖的若干小区组成家庭 基站覆盖区域。 区别于向所有用户提供服务的普通的基站， 家庭基站只允许 经过授权的用户， 比如家庭成员、 团体成员等用户接入并提供服务。 家庭基 站下的小区只向部分被授权的用户提供服务， 所以被家庭基站覆盖的小区通 常称为非公开 4受权用户组（CSG, Closed Subscriber Group ) 小区， 即， 家庭 基站小区即为 CSG小区。 CSG小区通过在广播消息里携带一个 CSG指示来 向用户终端表明该小区是一个 CSG小区。 用户终端被分为两类， 一类是支持 CSG能力的 CSG用户终端 , 另一类是不支持 CSG能力的 Non-CSG用户终 端， 并且 Non-CSG用户终端不会驻留在 CSG小区， 而对于 CSG用户终端来 说 , 其只能驻留在被授权的 CSG小区， 而不能驻留在没有被授权的 CSG 'J、 区。 CSG用户终端将允许驻留的 CSG小区的标识保存在 USIM卡的一个列 表里， 这个列表被称为白列表。 CSG用户终端总是通过在白列表内查找想要 驻留小区的的小区标识来确认其是否能驻留该小区。当 CSG 'J、区扩展到公共 场所如校园， 厂房， 公园使用时， 还可以通过以开放模式或者混合模式运行， 达到允许非 4受权的用户终端使用该小区的资源的目的。 一方面， 在蜂窝移动通讯系统中， 切换和小区重选都是极其重要的组成 部分， 具体的说， 当用户终端离开一个小区进入另外一个小区时， 该用户终 端所接收到的原来小区的信号越来越弱 , 而它所接收到的正在进入的小区的 信号越来越强。 为了保证用户终端接收信号的质量， 必须将该用户终端由原 来的基站转换到新进入的信号较强的基站。 对于连接态的用户终端， 这种基 站之间的转换称为切换， 而对于空闲态的用户终端， 用户终端驻留小区的变 更通过小区重选过程完成， 需要对待重选到的小区即目标小区进行检测， 在 符合要求的目标小区中进行小区重选。 由于 CSG小区有资费上的优势， 普通 小区即宏小区上的负载也会大大减轻， 所以支持 CSG能力的 CSG用户终端 会尽可能的驻留在被授权的 CSG小区上。 CSG用户终端通过人工或者自动 的方式发起对 CSG小区的搜索。网络运行商在网络规划时会保留一部分物理 资源， 如物理小区标识（PCI, Physical Cell Identity ), 专门供 CSG小区使用， 并且会将该配置通过广播或者信令等方式通知给 CSG用户终端。 CSG用户 终端通过物理层的扫描即可判断小区是否是 CSG小区。 另一方面， 用户终端接收信号的质量靠用户终端的测量完成， 为了节省 用户终端的耗电， 尽可能的减少需要测量的目标小区， 在现代无线蜂窝系统 中， 用户终端在小区间重选过程中的一种测量策略是基于频率优先级的小区 测量策略。 运营商在小区网络规划时， 将所有的频率分成几组， 每组分配一 个优先级。 每个小区会广播自身所在频率的优先级和相邻小区所在频率的优 先级。 用户终端被要求尽可能驻留到优先级高的频率上去。 具体来说， 用户 终端基于频率优先级的小区测量规则为： 首先， 对于比驻留小区频率优先级 高的频率上的邻小区进行周期性测量。 其次， 对于同频邻小区的测量只有在 服务小区信号质量低于门限值时才开启， 否则用户终端可能不做测量。 最终， 对于比驻留频率优先级^^或者同优先级的频率上的邻区只有在月 务小区信号 质量氏于门限值时才开启测量， 否则用户终端可能不 ^故测量。 那么，采用现有技术即基于优先级的重选方法包括两方面内容。一方面， 涉及一个重选条件， 该重选条件为： 被测频点上一个小区的 Sn。nServingCell,x值 在 TreselectionRAT时间内啫 p大于门限值 ThreshX;high„其中， x表示被测频点 , nonServingCell表示被测小区， Sn。nSCTvingCell,x表示被测小区的小区选择接收电 平值， TreselectionRAT表示小区重选测量时间， Threshx,high表示向高优先级频 点重选门限。 另一方面， 涉及基于该重选条件所采用的重选方法， 以下对重 选方法的具体处理过程进行阐述。 基于优先级的重选方法具体包括以下步骤： 步骤 101、 如果一个高优先级频点内的某一小区满足所述重选条件， 并 且用户终端在当前驻留小区已经驻留 1秒钟以上， 则重选到该小区。 这里， 步骤 101是针对高优先级频点的小区而言的， 只要它满足所述重 选条件， 就可以实现重选。 步骤 102、 当驻留频点没有可重选小区， 且没有高优先级频点小区满足 所述重选条件，此夕卜，驻留小区的测量电平 SServingCell低于门限
Figure imgf000005_0001
当被测低优先级频点上一个小区的 Sn。nServingCeU,x值在 TreselectionRAT时间内都 大于门限值 Threshxjcw时， 则重选到该小区。 其中， x表示的被测频点具体为 被测低优先级的频点， Sn。nServingCell,x表示的被测小区的小区选择接收电平值具 体为被测小区的测量电平值， TreselectionRAT表示小区重选测量时间。
Threshservingjow表示驻留小区低电平门限， Threshxj 表示向氐优先级频点重 选门限。 这里 , 步骤 102主要是针对没有高优先级频点的小区 , 以及没有相同优 先级频点的小区的情况而言的， 实现重选的目的是为了向更氏优先级频点的 小区进行重选。 步骤 103、 对于同频小区和同优先级频点小区内重选按基于偏移的小区 重选方法重选。 这里，步骤 103是针对相同优先级频点的小区在同频或异频的情况而言 的， 也可以理解为针对多个小区采用基于偏移的小区重选方法来实现重选。 步骤 104、 当在一频点或同优先级的多个频点内有多个小区满足所述重 选条件时， 用户终端选择最好小区作为重选的目标小区。 这里， 步骤 104是也是针对多个小区而言的， 采用选择最好小区来实现 重选。 这里需要指出的是， 步骤 101〜步骤 104的侧重点各有不同， 步骤 101 和步骤 102侧重如何挑选小区的问题， 而步骤 103和步骤 104侧重在已经挑 选出小区的情况下， 如何进一步挑选小区频点排列顺序的问题。 也就是说， 步骤 101 , 步骤 102和步骤 103构成一个重选解决方案， 步骤 101 , 步骤 102 和步骤 104也可以构成一个重选解决方案。 综上所述， 在一个频率内最好小区的选择是一个基于偏移的排序方法。 其中 Rs= Qmeas;S+Qhysts, Rn = Qmeas,n Qoffset , 其中， s表示驻留小区， n表 示相邻小区 , Qmeas,s 表示驻留小区在重选过程中的测量电平， Qmeas,n是相邻 小区在重选过程中的测量电平， Qhysts表示服务小区迟滞， Qoffset是邻小区 的电平偏移值， 对于驻留小区同频邻区 Qoffset = Qoffsets,n, 对于异频邻小区 Qoffset = Qoffsets,n + Qoffsetfi.equency , Qoffsets,n 是小区级另' J的偏移 , Qoffsetfi.equency是频率级别的偏移。 用户终端将所有 R值进行排序， 排在第一 位的即是最好小区， 用户终端重选到最好小区。 因为邻小区的重选难易程度， 除了小区的无线质量外，还取决于 Qoffset的取值大小， 所以这种方法又称为 基于偏移的小区重选方法。 由于 CSG小区的设置对于宏小区来说是无法预知的 , 也就是说对于宏 小区在网络规划时， 无法知道相邻会存在多少 CSG小区， 这些 CSG小区各 在哪些频点。 CSG小区在建立时为了达到最好的效果， 尽可能避免和邻区的 干扰，会通过扫描所有频点找到一个干扰最小的频点。 所以 CSG小区可能在 任何允许频点出现， 有可能是在宏小区相邻小区的频点， 也有可能是一个另 外的单独的频点。 如果 CSG 用户终端还按以上基于优先级的重选方法进行 重选，当 CSG小区的频点恰好是同优先级或者是低优先级的频点时， CSG 用 户终端较难重选到 CSG小区上去， 所以对于 CSG小区 , 另规定了一套重选 规则， 如下所示。 针对 CSG小区的重选规则而言， 对于从非 CSG小区重选到 CSG小区 的情况下， 即 CSG 用户终端驻留在一个非 CSG小区时， CSG用户终端通过 自动搜索查找 CSG小区 , 如果找到了一个合适的 CSG小区 , 而且这个 CSG 小区是它所在频点无线质量最好的小区， 那 CSG 用户终端不管该频点的原 来的优先级是多少 , 可以重选到该 CSG小区上去。 这种重选规则又被称为隐 式优先级规则。 当 CSG用户终端驻留在一个合适的 CSG小区时，用户终端认为该 CSG 所在的频点优先级为最高优先级， 小区重选时用户终端遵循以上基于优先级 的重选方法重选小区。 这样， 才艮据以上用户终端基于频率优先级的小区的测 量规则， 当用户终端驻留在 CSG小区时， 当小区无线信号质量高于同频和异 频测量门限时， CSG用户终端不会做任何其它的测量。 通过这样的处理可以 4艮大程度地减少用户终端在待机状态下的用电消耗。 然而， 才艮据以上的描述， 当 CSG用户终端驻留在 CSG 小区时， CSG 用户终端认为小区所在频点优先级最高， 高于任何相邻频点的优先级。 这样 导致了两个方面的问题： 第一， 由于 CSG用户终端认为自己所在频点的频率 优先级最高， 导致其它频点上的同样可以合适的 CSG小区较难重选过去。 第 二， 由于在用户终端驻留在 CSG小区时， 小区重选时用户终端遵循以上基于 优先级的重选方法， 这样导致小区广播里设置频率优先级之后， 使得这些频 点上的 CSG小区之间有不同的优先级。 总之， 采用现有技术， 由于 CSG小 区之间地位不平等 , 各自都拥有自身的优先级， 而且默认自身的优先级为最 高优先级， 而以上基于优先级的重选方法是一种基于最高优先级由高到氐4非 序， 来实现重选的方法， 目的是将用户终端重选到最高优先级频点所在的目 标小区。 因此， 采用现有技术的重选策略， 很难有效地实现重选， 因此导致 用户终端的信号质量很差。 发明内容 针对现有技术的重选策略艮难有效地实现重选，会导致用户终端的信号 质量很差的问题， 本发明的主要目的在于提供一种家庭基站小区间的重选方 法，保证 CSG小区之间地位平等，并使源 CSG小区与其待重选到的目标 CSG 小区具有相同的优先级， 从而有效地实现重选， 达到增强用户终端的信号质 量的目的。 根据本发明， 提供了一种家庭基站小区间的重选方法。 根据本发明的家庭基站 、区间的重选方法包括： 用户终端驻留在非公开授权用户组 CSG小区； 当用户终端从当前驻留 的源 CSG小区重选到目标 CSG小区时， 使源 CSG小区与目标 CSG小区具 有相同的频率优先级后完成重选。 优选地， 源 CSG小区与目标 CSG小区皆允许用户终端驻留； 源 CSG 小区与目标 CSG小区皆包括： 隶属于用户终端白列表内的 CSG小区、 或者 是允许非授权用户终端进入的 CSG小区。 优选地， 源 CSG小区与目标 CSG小区的 CSG 标识是相同的、 或者是 不相同的。 优选地 , 用户终端包括： 支持 CSG能力的 CSG用户终端。 优选地， 目标 CSG小区所在的频率为： 区别于源 CSG小区所在频率的 其他频率。 优选地 , 目标 CSG小区所在的频率优先级为： 用户终端当前驻留的源 CSG小区所广播的频率重选优先级。 优选地，使源 CSG小区与目标 CSG小区具有相同的频率优先级可以通 过设置频率优先级的方式，设置频率优先级的方式具体为： 在设置源 CSG小 区与目标 CSG小区具有相同频率优先级的基础上设置频率优先级，并使相同 频率优先级高于其他频率的频率优先级。 优选地， 其他频率为： 排除源 CSG小区所在频率和目标 CSG小区所在 频率之外的频率。其他频率也可以理解为频率上没有 CSG小区的频率或者频 率上的 CSG小区不满足重选条件的频率。 优选地， 完成重选具体为： 采用基于偏移的小区的重选方式， 将用户终 端从源 CSG小区重选到目标 CSG小区上来完成重选。 本发明的方法包括： 用户终端驻留在 CSG小区； 当用户终端从当前驻 留的源 CSG小区重选到目标 CSG小区时， 设置频率优先级， 并使源 CSG小 区与目标 CSG小区具有相同的频率优先级， 将用户终端从源 CSG小区重选 到目标 CSG小区上。 通过本发明 , 保证 CSG小区之间地位平等， 并使源 CSG小区与其待重 选到的目标 CSG小区具有相同的优先级， 上述优先级为频率优先级， 通过采 用改变的重选策略以及以上基于 ύ先级的重选方法实现有效地重选， 达到增 强用户终端的信号质量的目的。 也就是说， 解决了用户终端在驻留的 CSG小 区按以上基于优先级的重选方法中， 无法确保 CSG 小区间优先级相同的问 题， 使同样可以接入的 CSG小区间具有相同优先级。 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为本发明实施例的家庭基站 '』、区间的重选方法的流程图； 图 2为本发明一实例按优先级重选的示意图； 图 3为本发明一实例按优先级重选的示意图。 具体实施方式 功能相克述 考虑到现有技术的重选策略艮难有效地实现重选，会导致用户终端的信 号质量很差的问题， 本发明提供一种家庭基站小区间的重选方法， 当用户终 端从当前驻留的源 CSG小区重选到目标 CSG小区时， 设置频率优先级， 并 使源 CSG小区与目标 CSG小区具有相同的频率优先级，将用户终端从源 CSG 小区重选到目标 CSG小区上。 下文中将参考附图并结合实施例来详细说明本发明。 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组合。 图 1 为本发明实施例的家庭基站小区间的重选方法的流程图， 如图 1 所示， 该方法包括以下的步骤 101至步骤 103: 步骤 101 : 用户终端驻留在 CSG小区； 这里， CSG小区即家庭基站小区。 步骤 102: 发现有一个频点上的 CSG小区满足重选条件， 使源 CSG小 区与目标 CSG小区具有相同的频率优先级； 针对步骤 101和步骤 102而言， 这里， 源 CSG小区与目标 CSG小区皆 允许用户终端驻留； 源 CSG小区与目标 CSG小区皆包括： 隶属于用户终端 白列表内的 CSG小区、 或者是允许非授权用户终端进入的 CSG小区 , 比如 隶属于用户终端以开放模式授权进入的 CSG小区。 也就是说 , 源 CSG 'J、区 与目标 CSG小区的类型可以是在用户终端白列表内的 CSG小区， 也可以是 任意用户终端都可以 4受权进入的 CSG小区。 这里 , 源 CSG小区与目标 CSG小区的 CSG 标识可以是相同的也可以 是不相同的。 用户终端包括： 支持 CSG能力的 CSG用户终端。 这里， 目标 CSG小区所在的频率为： 区别于源 CSG小区所在频率的其 他频率。 也就是说， 其他频率为■ ^除源 CSG小区所在频率之外的频率。 这里，目标 CSG小区所在的频率优先级为：用户终端当前驻留的源 CSG 小区所广播的频率重选优先级。 需要指出的是， 当用户终端驻留在 CSG小区 时 , 在用户终端要重选到另一个频率上的目标 CSG小区时， 用户终端认为源 CSG小区与目标 CSG小区具有相同的频率优先级， 而不管该目标 CSG小区 原来的频率优先级是多少。 这个目标 CSG小区原来的频率优先级即为： 这里 涉及到的目标 CSG小区所在的频率优先级。 这里，使源 CSG小区与目标 CSG小区具有相同的频率优先级可以通过 设置频率优先级的方式实现， 设置频率优先级的方式具体为： 在设置源 CSG 小区与目标 CSG小区具有相同频率优先级的基础上设置频率优先级，并使相 同频率优先级高于其他频率的频率优先级。 其中， 这里的其他频率为： 排除 源 CSG小区所在频率和目标 CSG小区所在频率之外的频率。 这里的其他频 率也可以理解为频率上没有 CSG小区的频率或者频率上的 CSG小区不满足 所述重选条件的频率。 步骤 103: 完成重选， 比如将用户终端从源 CSG小区重选到目标 CSG 小区上。 这里需要指出的是， 步骤 103中， 将用户终端从源 CSG小区重选到目 标 CSG小区上即为采用以上现有的基于优先级的重选方法。本发明相对于现 有技术而言， 改变了重选策略。 改变的重选策略即为： 保证 CSG小区之间地 位平等，并使源 CSG小区与其待重选到的目标 CSG小区具有相同的优先级， 这里， 优先级为频率优先级， 通过采用改变的重选策略以及基于优先级的重 选方法实现有效地重选。 比如， ^)夺用户终端从源 CSG小区重选到目标 CSG 'J、区上可以具体为： 采用基于偏移的小区的重选方式排序后完成重选。 实例一：本实例基于图 2所示的按优先级重选的示意图。 图 2中的 CSG 小区以左斜线填充表示。
CSG用户终端驻留在频率 A的 CSG小区 H— al上， 通过广播得到另两 个频率 B和 C的优先级 F— b和 F— c, 优先级顺序依次为 F— a > F_b > F— c。 当 CSG用户终端在频率 B上搜索到宏小区 M— bl时 , 频点 C通过扫描 CSG保 留的 PCI, 搜索到 CSG小区 H— cl和宏小区 M— cl。 H al和 H— cl属于同一 个 CSG, 拥有相同的 CSG标识。 该 CSG标识能够在用户终端的白列表内找 到。由于 CSG 用户终端驻留在 H— al上，频率的优先级被认为是最高优先级， 当前条件下 F— a已经是最高优先级， 所以不需要修改。 当 H— cl成为频点 C 上最好小区时， CSG 用户终端将 H— cl列入可以被重选的小区， 此时频率 C 优先级变成最高，设置为 F— c，， 和 F— a相等。 所以各频点优先级顺序为 F— a = F— c， > F— b。 按照基于优先级的重选法则， H— al和 H— cl所在频率优先级相 同， 按基于偏移的小区重选方法排序后， 如果在 Treselection 时间内满足 RH_ci>RH-ai , CSG用户终端重选到 CSG小区 H— cl。 实例二：本实例基于图 2所示的按优先级重选的示意图。 图 2中的 CSG 小区以左斜线填充表示。
CSG 用户终端驻留在频率 A的 CSG小区 H— al上， 通过广播得到另两 个频率 B和 C的优先级 F— b和 F— c, 优先级顺序依次为 F— a > F_b > F— c。 当 CSG用户终端在频率 B上搜索到宏小区 M— bl时 , 频点 C通过扫描 CSG保 留的 PCI, 搜索到 CSG小区 H— cl和宏小区 M— cl。 H al和 H— cl属于同一 个 CSG, 拥有相同的 CSG标识。 该 CSG 标识能够在用户终端的白列表内找 到。由于 CSG 用户终端驻留在 H— al上，频率的优先级被认为是最高优先级， 被认为是 F— a，并且大于现有的已定义的优先级， F— a，>F— a>F— b>F— c。 当 H— cl 成为频点 C上最好小区时， CSG 用户终端将 H—cl列入可以被重选的小区， 此时频率 C优先级变成最高， 设置为 F— c，， 和 F— a相等。 所以各频点优先级 顺序为 F— a， = F— c， > F— b。 按照基于优先级的重选法则， H— al和 H—cl所在 频率优先级相同， 按基于偏移的小区重选方法排序后， 如果在 Treselection 时间内满足 RH_ci>RH-ai , CSG用户终端重选到 CSG小区 H—cl。 实例三：本实例基于图 3所示的按优先级重选的示意图。 图 3中的 CSG 小区以左斜线填充表示。 CSG 用户终端驻留在频率 A的 CSG小区 H— al上， 通过广播得到另一 个频率 B, 优先级顺序默认设置为 F— b >F— a 。 CSG用户终端还找到另一个 频点 C,但 C频点没有在 H al上广播。 当 CSG用户终端在频率 A上还搜索 到宏小区 M— al时， 频率 B上搜索到宏小区 M— M , 频点 C搜索到 CSG小区 H—cl和宏小区 M— cl。 H— al和 H—cl属于不同 CSG, 拥有不相同的 CSG标 识。 这两个 CSG 标识都能够在用户终端的白列表内找到。 由于 CSG 用户终 端驻留在 H— al上， 所以频率的优先级被重新设置为 F—a，， 且 F— a，>F— b。 当
H—cl成为频点 C上最好小区时， CSG 用户终端将 H—cl列入可以被重选的 小区，此时频率 C优先级变成最高，设置为 F— c，，和 F— a，相等。 F— a，=F— c，>F— b, 按照重选法则， H— al和 H— cl所在频率优先级相同， 按基于偏移的小区重选 方法 4非序后， 才艮据小区 H— al 广播频点 A 的重选时间 Treselection, 如果在 Treselection时间内满足 RH_ci>RH-ai , CSG用户终端重选到 CSG小区 H— cl。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布 在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行的程 序代码来实现， 从而， 可以将它们存储在存储装置中由计算装置来执行， 或 者将它们分别制作成各个集成电路模块， 或者将它们中的多个模块或步骤制 作成单个集成电路模块来实现。 这样， 本发明不限制于任何特定的硬件和软 件结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本 领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的^^申和 原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书
1. 一种家庭基站小区间的重选方法， 其特征在于， 该方法包括：
用户终端驻留在非公开 4受权用户组 CSG 小区； 当所述用户终端 从当前驻留的源 CSG小区重选到目标 CSG小区时， 使所述源 CSG小 区与所述目标 CSG小区具有相同的频率优先级后完成重选。
2. 根据权利要求 1所述的方法， 其特征在于， 所述源 CSG小区与所述目 标 CSG小区皆允许所述用户终端驻留； 所述源 CSG小区与所述目标 CSG小区皆包括： 隶属于所述用户终端白列表内的 CSG小区、或者是 允许非 4受权用户终端进入的 CSG小区。
3. 根据权利要求 1所述的方法 , 其特征在于 , 所述源 CSG小区与所述目 标 CSG小区的 CSG 标识是相同的、 或者是不相同的。
4. 根据权利要求 1、 2或 3所述的方法，其特征在于，所述用户终端包括： 支持 CSG能力的 CSG用户终端。
5. 根据权利要求 4所述的方法， 其特征在于， 目标 CSG小区所在的频率 为： 区别于源 CSG小区所在频率的其他频率。
6. 根据权利要求 4所述的方法， 其特征在于， 目标 CSG小区所在的频率 优先级为：用户终端当前驻留的源 CSG小区所广播的频率重选优先级。
7. 根据权利要求 4所述的方法 , 其特征在于 , 所述使源 CSG小区与目标 CSG小区具有相同的频率优先级可以通过设置频率优先级的方式， 所 述设置频率优先级的方式具体为：在所述设置源 CSG小区与目标 CSG 小区具有相同频率优先级的基础上设置频率优先级， 并使所述相同频 率优先级高于其他频率的频率优先级。
8. 根据权利要求 7所述的方法， 其特征在于， 所述其他频率为： 排除源 CSG小区所在频率和目标 CSG小区所在频率之外的频率。其他频率也 可以理解为频率上没有 CSG小区的频率或者频率上的 CSG小区不满 足重选条件的频率。 才艮据权利要求 4所述的方法， 其特征在于， 所述完成重选具体为： 采 用基于偏移的小区的重选方式，将用户终端从源 CSG小区重选到目标 CSG小区上来完成重选。
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US8660089B2 (en) 2014-02-25
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