WO2011123974A1 - 小区选择和切换的判决方法和设备 - Google Patents

小区选择和切换的判决方法和设备 Download PDF

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Publication number
WO2011123974A1
WO2011123974A1 PCT/CN2010/000444 CN2010000444W WO2011123974A1 WO 2011123974 A1 WO2011123974 A1 WO 2011123974A1 CN 2010000444 W CN2010000444 W CN 2010000444W WO 2011123974 A1 WO2011123974 A1 WO 2011123974A1
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Prior art keywords
cell
signal
noise ratio
interference
candidate
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PCT/CN2010/000444
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English (en)
French (fr)
Inventor
蒋琦
沈钢
王钧
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上海贝尔股份有限公司
阿尔卡特朗讯
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Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to PCT/CN2010/000444 priority Critical patent/WO2011123974A1/zh
Priority to CN201080065822.8A priority patent/CN102845106B/zh
Publication of WO2011123974A1 publication Critical patent/WO2011123974A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/54Allocation or scheduling criteria for wireless resources based on quality criteria

Definitions

  • the present invention relates to the field of mobile communications, and more particularly to a method and apparatus for determining cell selection and handover. Background technique
  • HTN Heterogeneous
  • RSRP Reference Signal Receiving Power
  • path loss based criteria are proposed in 3GPP.
  • CCH Control Channel
  • the biased RSRP standard for HTN is a good way to extend coverage and enable low power nodes to serve more UEs.
  • R1 - 101451 "Downlink CCH performance aspects for co-channel deployed macro and HeNBs", Nokia Siemens Networks, Nokia 3GPP RANI #60 San Francisco, US, Feb., 2010, the signal to interference and noise ratio for high priority channels (SINR: Signal Inference Noise Ratio) requires that although biasing RSRP can cause low-power nodes to serve more UEs, biasing RSRP (HTN System Design Document V. 10, Alcatel-Lucent) may cause problems during CCH reception. .
  • a cell selection method including performing the following steps on a user equipment: a preset step of presetting a signal to interference and noise ratio threshold of a channel; and a searching step of searching for a group of satisfying cell selection conditions a candidate cell; a measuring step of measuring a reference signal received power RSRP of the candidate cell; a calculating step of calculating a signal to interference and noise ratio of the candidate cell; and a signal to interference and noise ratio pre-decision step, selecting a candidate cell having the largest RSRP, if If the signal to interference and noise ratio of the candidate cell is greater than the signal to interference and noise ratio threshold, the current candidate cell is selected as the serving cell; if the signal to interference and noise ratio of the candidate cell is smaller than the signal to interference and noise ratio threshold, the RSRP is selected.
  • a cell handover method including performing the following steps on a user equipment: a preset step of presetting a signal to interference and noise ratio threshold of a channel; and a searching step of searching for a cell handover trigger condition a group or a neighboring cell as a candidate neighboring cell; a measuring step of measuring a reference signal received power RSRP of the candidate neighboring cell; a calculating step of calculating a signal to interference and noise ratio of the candidate neighboring cell; a signal to interference and noise ratio pre-decision step, Selecting a candidate neighbor cell with the largest RSRP, if the signal to interference and noise ratio of the candidate neighbor cell is greater than the signal to interference and noise ratio threshold, selecting the current candidate neighbor cell as the hand
  • a user equipment comprising the following components: a preset device, Predetermining a signal to interference and noise ratio threshold of the channel; searching means for searching for a set of candidate cells satisfying the cell selection condition; measuring means for measuring a reference signal received power RSRP of the candidate cell; calculating means for calculating a letter of the candidate cell a signal to interference and noise ratio pre-determination device, selecting a candidate cell with a maximum RSRP, and if the signal to interference and noise ratio of the candidate cell is greater than the signal to interference and noise ratio threshold, selecting a current candidate cell as a serving cell; If the signal to interference and noise ratio of the candidate cell is smaller than the signal to interference and noise ratio threshold, another candidate cell that is selected to be the second largest RSRP is configured to perform measurement by the measuring device, perform calculation by the computing device, and perform the signal through the signal.
  • the pre-decision device performs a signal to interference and noise ratio pre-decision. If the predetermined signal to interference and noise ratio threshold is
  • a user equipment comprising: a preset device, a signal to interference and noise ratio threshold of a preset channel; and a searching device searching for a group or a neighbor that satisfies a cell handover trigger condition a cell as a candidate neighbor cell; a measuring device, measuring a reference signal received power RSRP of the candidate neighbor cell; a computing device, calculating a signal to interference and noise ratio of the candidate neighbor cell; and a signal to interference and noise ratio pre-determination device, selecting a one of the largest RSRP a candidate neighboring cell, if the signal to interference and noise ratio of the candidate neighboring cell is greater than the signal to interference and noise ratio threshold, selecting a current candidate neighboring cell as a handover cell; if the signalling to interference and noise ratio of the candidate neighboring cell is greater than the signal to interference noise If the threshold is smaller, another candidate neighbor cell with the second largest RSRP is selected to perform the measurement by the measuring device, perform calculation by the computing device
  • a base station is further provided, the base station receiving, from a user equipment according to the fourth aspect of the present invention, a cell report satisfying a cell handover trigger condition and a signal to interference and noise ratio threshold, and determining which cell to handover to.
  • the present invention contemplates channel reception during cell selection/reselection and handover to avoid unsuccessful selection/switching due to channel failure.
  • FIG. 1 shows a flow chart of a cell selection method according to an embodiment of the present invention
  • FIG. 2 shows a flow chart of a cell handover method according to an embodiment of the present invention
  • FIG. 3 illustrates a user equipment according to an embodiment of the present invention
  • FIG. 4 shows a user equipment according to another embodiment of the present invention. detailed description
  • Embodiments of the present invention disclose a cell selection and handover procedure for a heterogeneous network.
  • additional pre-judgments for successful reception of control, broadcast, and system information are inserted in conventional RSRP or in an improved RSRP based cell selection and handover standard.
  • Such pre-judgment can be performed at the UE or low power node/eNB side, and such pre-judgment can be implemented in different ways.
  • a pre-judgment should be performed on the UE. This means that when the UE has searched for one or several candidate cell logged in, the UE also measures the RSRP for these cells. Before the UE triggers a random access procedure for the preferred cell based on RSRP or modified RSRP cell selection rules, the UE should first calculate the SINR based on the RSRP measurements. The methods used to implement the measurements and calculations are easy to perform. For example, the UE may first select one cell from the candidate cells as the hypothesized serving cell, and select other cells as the neighbor cells. Then, the ratio between the RSRP from the hypothetical serving cell and the sum of the RSRPs from the respective neighbor cells is a rough SINR value.
  • the SINR is greater than the threshold - xdB, it is used to perform cell selection criteria for further procedures. Otherwise, another candidate cell is selected to repeat the above process to re-run the SINR decision. If no cell satisfies the SINR threshold for the CCH, the cell selection criteria are directly performed. Through this pre-judgment, it is ensured that the user selects a cell with a sufficiently strong CCH to serve.
  • FIG. 1 is a schematic flow chart of a cell selection method according to an embodiment of the present invention.
  • the cell selection method includes the following steps performed on a user equipment: a preset step of presetting a signal to interference and noise ratio threshold of a channel; and a searching step of searching for a group of candidate cells satisfying a cell selection condition; a measuring step of measuring a reference signal received power RSRP of the candidate cell; a calculating step of calculating a signal to interference and noise ratio of the candidate cell; and a signal to interference and noise ratio pre-decision step, selecting a candidate cell having the largest RSRP, if the candidate cell If the signal to interference and noise ratio is greater than the signal to interference and noise ratio threshold, then the current candidate cell is selected as the serving cell; if the candidate is small If the signal to interference and noise ratio of the area is smaller than the signal to interference and noise ratio threshold, another candidate cell with the second largest RSRP is selected to perform the measurement step, the calculation step, and the signal to interference and noise ratio pre-de
  • the measuring step includes: selecting one cell from the candidate cells as the hypothetical serving cell, and selecting other cells as the neighbor cells; and the calculating step includes: the RSRP from the hypothetical serving cell and the RSRP from each neighbor cell The ratio between and is used as the calculated signal to noise ratio.
  • the channel herein may be at least one of a control channel, a broadcast channel, and a peer channel.
  • a control channel for the cell handover procedure, there are two options for implementing the pre-judgment based on the content related to the handover in the measurement report.
  • the pre-judgment of cell handover is implemented on the UE.
  • the UE will judge the handover in two ways before triggering the handover procedure.
  • the UE should run a comparison such as a comparison of RSRP between the serving cell and the neighbor cell, and then select a neighbor cell that satisfies the handover trigger condition.
  • the UE should also calculate the SINR value for these neighbor cells that satisfy the condition. This is the same as the cell selection/reselection process.
  • the UE will only report cells that satisfy both the handover criteria and the SINR threshold in the measurement report for the eNB.
  • the eNB decides to switch to that cell.
  • FIG. 2 is a schematic flowchart diagram of a cell handover method according to an embodiment of the present invention.
  • the cell handover method includes the following steps performed on a user equipment: performing the following steps on a user equipment: a preset step, preset a signal to interference and noise ratio threshold of a channel; and a searching step, the search satisfies a cell handover a group or a neighboring cell that triggers a condition as a candidate neighboring cell; a measuring step of measuring a reference signal received power RSRP of the candidate neighboring cell; a calculating step of calculating a signal to interference and noise ratio of the candidate neighboring cell; a decision step, selecting a candidate neighbor cell with the largest RSRP, if the signal to interference and noise ratio of the candidate neighbor cell is greater than the signal to interference and noise ratio threshold, selecting the current candidate neighbor cell as the handover cell; If the dry noise ratio is smaller than the signal to interference and noise ratio threshold, another candidate neighbor cell with the second largest RSRP is selected to perform
  • the pre-judgment of cell handover is implemented on the eNB.
  • the current standard also supports RSRP and RSRQ reporting for neighbor cells as an alternative.
  • the UE reports only the measured RSRP and RSRQ information of all cells satisfying the handover criteria to the eNB or the low power node.
  • the eNB or the low power node calculates the SINR by RSRP and RSRQ from the UE before making the handover decision.
  • This approach has no impact on the UE, but will introduce more UL burden for measurement reporting.
  • the user equipment is switched to the cell that can successfully receive the CCH compared to the preset SINR threshold.
  • FIG. 3 shows a user equipment in accordance with an embodiment of the present invention. As shown in FIG.
  • the user equipment includes the following components: a preset device, preset a signal to interference and noise ratio threshold of a channel; a searching device, searching for a group of candidate cells that satisfy a cell selection condition; and a measuring device, measuring the candidate a reference signal receiving power RSRP of the cell; a computing device, calculating a signal to interference and noise ratio of the candidate cell; a signal to interference and noise ratio pre-determination device, selecting a candidate cell with a maximum RSRP, if the signal to interference and noise ratio of the candidate cell is greater than If the signal to interference and noise ratio threshold is large, the current candidate cell is selected as the serving cell; if the signal to interference and noise ratio of the candidate cell is smaller than the signal to interference and noise ratio threshold, another candidate cell with the second largest RSRP is selected to pass the measurement.
  • a preset device preset a signal to interference and noise ratio threshold of a channel
  • a searching device searching for a group of candidate cells that satisfy a cell selection condition
  • a measuring device measuring the candidate
  • the device performs measurement, performs calculation by the computing device, and performs signal to interference and noise ratio pre-decision by the signal to interference and noise ratio pre-decision device, if the predetermined signal to interference and noise ratio threshold is not met in the candidate cell, Directly select the largest cell access for RSRP.
  • the measuring device may select one cell from the candidate cells as the hypothetical serving cell, select another cell as the neighbor cell, and the computing device compares the RSRP from the hypothetical serving cell with the RSRP from each neighbor cell. The ratio is used as the calculated signal to interference and noise ratio.
  • a user equipment including: a preset device, a signal to interference and noise ratio threshold of a preset channel; and a searching device, searching for a group or a neighbor that satisfies a cell handover trigger condition a cell as a candidate neighbor cell; a measuring device, measuring a reference signal received power RSRP of the candidate neighbor cell; a computing device, calculating a signal to interference and noise ratio of the candidate neighbor cell; and a signal to interference and noise ratio pre-determination device, selecting a one of the largest RSRP a candidate neighboring cell, if the signal to interference and noise ratio of the candidate neighboring cell is greater than the signal to interference and noise ratio threshold, selecting a current candidate neighboring cell as a handover cell; if the signalling to interference and noise ratio of the candidate neighboring cell is greater than the signal to interference noise If the threshold is smaller than the threshold, the candidate neighbor cell with the second largest RSRP is selected to pass the measurement.
  • the device Performing, by the device, performing the calculation, performing calculation by the computing device, and performing a signal to interference and noise ratio pre-decision by the signal to interference and noise ratio pre-decision device; if the predetermined signal to interference and noise ratio threshold requirement is not met in the candidate cell And directly selecting the cell with the largest RSRP as the handover cell; the reporting device reports the cell that meets the cell handover trigger condition and the signal to interference and noise ratio threshold to the base station.
  • Embodiments of the present invention are also directed to a base station that receives a cell report that satisfies a cell handover trigger condition and a signal to interference and noise ratio threshold from a user equipment according to the present invention, and determines which cell to handover to. So far, all the improvement criteria for cell selection/reselection and handover have not considered the reception of CCH, which is unreasonable. Embodiments of the present invention contemplate CCH reception at cell selection/reselection and handover to avoid unsuccessful selection/handover due to control channel failure.

Description

小区选择和切换的判决方法和设备 技术领域
本发明涉及移动通信领域, 更具体地, 涉及一种小区选择和切换的判决方法和 设备。 背景技术
在 3GPP 长期演进的研究项目中已经增加了异构网 (HTN : Heterogeneous
Network), 并且在第 10版本的实施阶段中极有可能包括异构网。下面将讨论 HTN的 场景、 性能度量和技术方面。
与传统蜂窝系统相比较, 如果由低功率节点来代替宏 eNB来服务更多用户设备
UE, HTN 系统可以实现较高的性能。 由于覆盖部署的原因, 如果想要实现较高的性 能增益, 应该改变小区选择标准。 为此目的, 在 3GPP中提出了诸如偏置参考信号接 收功率 (RSRP : Reference Signal Receiving Power)或基于路径损耗准则之类的几 种小区选择标准。
然而, 这些改进的小区选择标准并没有考虑控制信道(CCH : Control Channel ), 广播信道和同步信道的成功接收,在 UE和节点之间的通信中这些信道相较于数据信 道, 具有较高优先级。 与传统的蜂窝小区不同, 高 RSRP并不意味着对于 CCH接收的 高鲁棒性。对于新的小区选择标准,存在 UE根据新的规则不能成功接收 CCH的情况。 那么由于 CCH接收的失败, 由改进的小区选择所带来的益处将仅仅是个空中楼阁。
为了更清楚的讨论, 举例说明。 根据 3GPP的讨论, 针对 HTN的偏置 RSRP标准 是用来延伸覆盖范围和使得低功率节点服务更多 UE的一种很好的方式。然而, 根据 R1 - 101451, " Downlink CCH performance aspects for co-channel deployed macro and HeNBs" , Nokia Siemens Networks, Nokia 3GPP RANI #60San Francisco, U. S. , Feb. , 2010中对于高优先级信道的信干噪比 (SINR: Signal Inference Noise Ratio) 要求, 尽管偏置 RSRP可以使得低功率节点服务更多的 UE, 但是在 CCH接收 时偏置 RSRP (HTN System Design Document V. 10, Alcatel-Lucent ) 可能会有问 题。
迄今为止, 由于对于传统蜂窝系统应用最大 RSRP规则并且最大 RSRP意味着最 佳的 CCH接收, 并没有考虑将小区选择与 CCH接收相结合。 对于 HTN系统, 如果使 用改进的 RSRP小区选择准则 (例如, 偏置 RSRP), 那么驻留在低功率节点上的 UE 可能不会成功地接收到 CCH, 导致性能退化。 发明内容
为了解决上述目的, 本发明提出了一种小区选择方法、 小区切换方法、 作用于 用户设备和基站。 根据本发明的第一方面, 提出了一种小区选择方法, 包括在用户设备上执行以 下步骤: 预设步骤, 预先设定信道的信干噪比阈值; 搜索步骤, 搜索一组满足小区 选择条件的候选小区; 测量步骤, 测量所述候选小区的参考信号接收功率 RSRP; 计 算步骤, 计算所述候选小区的信干噪比; 信干噪比预判决步骤, 选择 RSRP最大的一 个候选小区, 如果所述候选小区的信干噪比比所述信干噪比阈值大, 则选择当前的 候选小区作为服务小区; 如果所述候选小区的信干噪比比所述信干噪比阈值小, 则 选择 RSRP次大的另一个候选小区执行所述测量步骤、计算步骤和信干噪比预判决步 骤; 若在候选小区中没有满足预先设定的信干噪比阈值要求的, 则直接选择 RSRP最 大的小区接入。 根据本发明的第二方面, 提出了一种小区切换方法, 包括在用户设备上执行以 下步骤: 预设步骤, 预先设定信道的信干噪比阈值; 搜索步骤, 搜索满足小区切换 触发条件的一组或一个邻小区作为候选邻居小区; 测量步骤, 测量所述候选邻居小 区的参考信号接收功率 RSRP; 计算步骤, 计算所述候选邻居小区的信干噪比; 信干 噪比预判决步骤, 选择 RSRP最大的一个候选邻居小区, 如果所述候选邻居小区的信 干噪比比所述信干噪比阈值大, 则选择当前候选邻居小区作为切换小区; 如果所述 候选邻居小区的信干噪比比所述信干噪比阈值小,则选择 RSRP次大的另一个候选邻 居小区执行所述测量步骤、 计算步骤和信干噪比预判决步骤; 若在候选小区中没有 满足预先设定的信干噪比阈值要求的, 则直接选择 RSRP最大的小区作为切换小区; 将满足小区切换触发条件和信干噪比阈值的小区报告给基站; 然后, 由基站决定切 换到哪个小区。
根据本发明的第三方面, 还提出了一种用户设备, 包括以下部件: 预设装置, 预先设定信道的信干噪比阈值; 搜索装置, 搜索一组满足小区选择条件的候选小区; 测量装置, 测量所述候选小区的参考信号接收功率 RSRP; 计算装置, 计算所述候选 小区的信干噪比; 信干噪比预判决装置, 选择 RSRP最大的一个候选小区, 如果所述 候选小区的信干噪比比所述信干噪比阈值大,则选择当前的候选小区作为服务小区; 如果所述候选小区的信干噪比比所述信干噪比阈值小,则选择 RSRP次大的另一个候 选小区通过所述测量装置执行测量、 通过所述计算装置执行计算和通过所述信干噪 比预判决装置执行信干噪比预判决, 若在候选小区中没有满足预先设定的信干噪比 阈值要求的, 则直接选择 RSRP最大的小区接入。
根据本发明的第四方面, 还提出了一种用户设备, 包括以下装置: 预设装置, 预先设定信道的信干噪比阈值; 搜索装置, 搜索满足小区切换触发条件的一组或一 个邻居小区作为候选邻居小区; 测量装置, 测量所述候选邻居小区的参考信号接收 功率 RSRP; 计算装置, 计算所述候选邻居小区的信干噪比; 信干噪比预判决装置, 选择 RSRP最大的一个候选邻居小区,如果所述候选邻居小区的信干噪比比所述信干 噪比阈值大, 则选择当前候选邻居小区作为切换小区; 如果所述候选邻居小区的信 干噪比比所述信干噪比阈值小,则选择 RSRP次大的另一个候选邻居小区通过所述测 量装置执行所述测量、 通过所述计算装置执行计算和通过所述信干噪比预判决装置 执行信干噪比预判决; 若在候选小区中没有满足预先设定的信干噪比阈值要求的, 则直接选择 RSRP最大的小区作为切换小区; 报告装置, 将满足小区切换触发条件和 信干噪比阈值的小区报告给基站。 根据本发明的第五方面, 还提出了一种基站, 所述基站从根据本发明第四方面 的用户设备接收满足小区切换触发条件和信干噪比阈值的小区报告, 决定切换到哪 个小区。 本发明考虑了在小区选择 /重新选择和切换时的信道接收,以避免由于信道故障 导致的不成功选择 /切换。 附图说明
根据以下结合附图对本发明非限制实施例的详细描述, 本发明的以上和其他目 的、 特征和优点将变得更加清楚, 其中:
图 1示出了根据本发明实施例的小区选择方法的流程图;
图 2示出了根据本发明实施例的小区切换方法的流程图;
图 3示出了根据本发明实施例的用户设备; 以及
图 4示出了根据本发明另一实施例的用户设备。 具体实施方式
下面, 将根据附图描述本发明。 在以下描述中, 一些具体的实施例只用于描述 的目的, 不应该将其理解为对于本发明的任何限制, 而只是示例。 当可能导致使本 发明的理解发生模糊时, 将省略传统结构或构造。
本发明的实施例公开了一种针对异构网的小区选择和切换过程。在这一程序中, 在传统的 RSRP或在基于改进 RSRP小区选择和切换标准中插入对于控制、 广播和系 统信息的成功接收的额外预判决。 可以在 UE或者低功率节点 /eNB侧执行这种预判 决, 并且可以通过不同的方式实现这种预判决。
对于小区选择和重新选择过程, 应该在 UE上执行预判决。 这意味着当 UE己经 搜索到一个或几个候选小区登陆时, UE也测量对于这些小区的 RSRP。在 UE基于 RSRP 或改进的 RSRP小区选择规则来触发对于优选小区的随机访问程序之前, UE应该首 先根据 RSRP测量来计算 SINR。 用于实现测量和计算的方法是易于执行的。 例如, UE可以首先从候选小区中选择一个小区作为假设的服务小区, 选择其他小区作为邻 居小区。 然后, 来自假设服务小区的 RSRP与来自各个邻居小区的 RSRP之和之间的 比率就是粗略的 SINR值。 如果该 SINR比阈值 - xdB大, 用于执行小区选择准则以进 行进一步的程序。 否则, 选择另一个候选小区重复上述过程以重新运行 SINR判决。 如果没有小区满足对于 CCH的 SINR阈值, 那么直接进行小区选择标准。通过这种预 判决, 确保用户选择具有足够强 CCH的小区来服务。
图 1是出了根据本发明实施例的小区选择方法的流程示意图。 如图 1所示, 所 述小区选择方法, 包括在用户设备上执行以下步骤: 预设步骤, 预先设定信道的信 干噪比阈值; 搜索步骤, 搜索一组满足小区选择条件的候选小区; 测量步骤, 测量 所述候选小区的参考信号接收功率 RSRP;计算步骤,计算所述候选小区的信干噪比; 信干噪比预判决步骤, 选择 RSRP最大的一个候选小区, 如果所述候选小区的信干噪 比比所述信干噪比阈值大, 则选择当前的候选小区作为服务小区; 如果所述候选小 区的信干噪比比所述信干噪比阈值小,则选择 RSRP次大的另一个候选小区执行所述 测量步骤、 计算步骤和信干噪比预判决步骤; 若在候选小区中没有满足预先设定的 信干噪比阈值要求的, 则直接选择 RSRP最大的小区作为服务小区接入。
其中, 所述测量步骤包括: 从候选小区中选择一个小区作为假设的服务小区, 选择其他小区作为邻居小区; 以及所述计算步骤包括: 将来自假设服务小区的 RSRP 与来自各个邻居小区的 RSRP之和之间的比率作为计算的信干噪比。
另外, 本领域普通技术人员应该理解, 这里的信道可以是控制信道、 广播信道、 同歩信道中的至少之一。 对于小区切换过程, 根据测量报告中与切换相关的内容, 存在两种实现预判决 的选择。
1. 小区切换的预判决在 UE上实现
这意味着在触发切换程序之前, UE将通过两个方面判断切换。 首先, UE应该运 行诸如服务小区和邻居小区之间 RSRP的比较之类的比较,然后选择满足切换触发条 件的邻居小区。 随后, UE也应该计算针对这些满足条件的邻居小区的 SINR值。 这 种方式与小区选择 /重新选择过程相同。 随后, UE将只上报同时满足切换标准和对 于 eNB的测量报告中的 SINR阈值的小区。 最后, eNB决定切换到那个小区。
图 2示出了根据本发明实施例的小区切换方法的流程示意图。 如图 2所示, 所 述小区切换方法包括在用户设备上执行以下步骤: 在用户设备上执行以下步骤: 预 设步骤, 预先设定信道的信干噪比阈值; 搜索步骤, 搜索满足小区切换触发条件的 一组或一个邻小区作为候选邻居小区; 测量步骤, 测量所述候选邻居小区的参考信 号接收功率 RSRP; 计算步骤, 计算所述候选邻居小区的信干噪比; 信干噪比预判决 步骤, 选择 RSRP最大的一个候选邻居小区, 如果所述候选邻居小区的信干噪比比所 述信干噪比阈值大, 则选择当前候选邻居小区作为切换小区; 如果所述候选邻居小 区的信干噪比比所述信干噪比阈值小,则选择 RSRP次大的另一个候选邻居小区执行 所述测量步骤、 计算步骤和信干噪比预判决步骤; 若在候选小区中没有满足预先设 定的信干噪比阈值要求的, 则直接选择 RSRP最大的小区作为切换小区; 将满足小区 切换触发条件和信干噪比阈值的小区报告给基站; 然后, 由基站决定切换到哪个小 区。
其中对服务小区和邻居小区之间的参考信号接收功率进行比较来选择满足切换 触发条件的邻居小区。
2. 小区切换的预判决在 eNB上实现
根据 3GPP 36. 331 , 当前标准也支持 RSRP和对于邻居小区的 RSRQ报告作为一 种可供选择的选择。 棊于这种原理, UE只向 eNB或低功率节点报告满足切换标准的 所有小区的测量 RSRP和 RSRQ信息。 然后, eNB或低功率节点在进行切换判决之前, 通过来自 UE的 RSRP和 RSRQ来计算 SINR。 这种方法对于 UE没有影响, 但是将引入 更多的 UL负担用于测量报告。 然后, 基于切换过程中的 SINR判决, 与预设的 SINR 阈值相比较, 将用户设备切换到可以成功接收 CCH的小区中。 图 3示出了根据本发明实施例的用户设备。 如图 3所示, 所述用户设备包括以 下部件: 预设装置, 预先设定信道的信干噪比阈值; 搜索装置, 搜索一组满足小区 选择条件的候选小区; 测量装置, 测量所述候选小区的参考信号接收功率 RSRP; 计 算装置, 计算所述候选小区的信干噪比; 信干噪比预判决装置, 选择 RSRP最大的一 个候选小区, 如果所述候选小区的信干噪比比所述信干噪比阈值大, 则选择当前的 候选小区作为服务小区; 如果所述候选小区的信干噪比比所述信干噪比阈值小, 则 选择 RSRP次大的另一个候选小区通过所述测量装置执行测量、通过所述计算装置执 行计算和通过所述信干噪比预判决装置执行信干噪比预判决, 若在候选小区中没有 满足预先设定的信干噪比阈值要求的, 则直接选择 RSRP最大的小区接入。
其中, 所述测量装置可以从候选小区中选择一个小区作为假设的服务小区, 选 择其他小区作为邻居小区;以及所述计算装置将来自假设服务小区的 RSRP与来自各 个邻居小区的 RSRP之和之间的比率作为计算的信干噪比。 图 4示出了根据本发明实施例的一种用户设备, 包括以下装置: 预设装置, 预 先设定信道的信干噪比阈值; 搜索装置, 搜索满足小区切换触发条件的一组或一个 邻居小区作为候选邻居小区; 测量装置, 测量所述候选邻居小区的参考信号接收功 率 RSRP; 计算装置, 计算所述候选邻居小区的信干噪比; 信干噪比预判决装置, 选 择 RSRP最大的一个候选邻居小区,如果所述候选邻居小区的信干噪比比所述信干噪 比阈值大, 则选择当前候选邻居小区作为切换小区; 如果所述候选邻居小区的信干 噪比比所述信干噪比阈值小,则选择 RSRP次大的另一个候选邻居小区通过所述测量 装置执行所述测量、 通过所述计算装置执行计算和通过所述信干噪比预判决装置执 行信干噪比预判决; 若在候选小区中没有满足预先设定的信干噪比阈值要求的, 则 直接选择 RSRP最大的小区作为切换小区; 报告装置, 将满足小区切换触发条件和信 干噪比阈值的小区报告给基站。
本发明的实施例还涉及一种基站, 所述基站从根据本发明的用户设备接收满足 小区切换触发条件和信干噪比阈值的小区报告, 决定切换到哪个小区。 迄今为止,所有关于小区选择 /重新选择和切换的改进标准都没有考虑 CCH的接 收, 这是不合理的。本发明的实施例考虑了在小区选择 /重新选择和切换时的 CCH接 收以避免由于控制信道失败导致的不成功选择 /切换。
以上实施例只是用于示例目的, 并不倾向于限制本发明。 本领域普通技术人员 应该理解的是, 在不脱离本发明的范围和精神的情况下, 可以存在对该实施例的各 种修改和代替, 并且这些修改和代替落在所附权利要求所限定的范围中。

Claims

权 利 要 求
1 . 一种小区选择方法, 包括在用户设备上执行以下步骤- 预设步骤, 预先设定信道的信干噪比阈值;
搜索步骤, 搜索一组满足小区选择条件的候选小区;
测量步骤, 测量所述候选小区的参考信号接收功率 RSRP;
计算步骤, 计算所述候选小区的信干噪比;
信干噪比预判决步骤,
选择当前候选小区中 RSRP最大的一个候选小区,
如果所述候选小区的信干噪比比所述信干噪比阈值大, 则选择当前的候选小区 作为服务小区;
如果所述候选小区的信干噪比比所述信干噪比阈值小,则选择 RSRP次大的另一 个小区执行所述测量步骤、 计算步骤和信干噪比预判决步骤;
如果在所述候选小区中没有满足预先设定的信干噪比阈值要求的, 则直接选择 RSRP最大的小区作为服务小区接入。
2. 根据权利要求 1所述的小区选择方法, 其中
所述测量步骤包括: 从候选小区中选择一个小区作为假设的服务小区, 选择其 他小区作为邻居小区; 以及
所述计算步骤包括: 将来自假设服务小区的 RSRP与来自各个邻居小区的 RSRP 之和之间的比率作为计算的信干噪比。
3. 根利要求 1-2中任一项所述的小区选择方法, 其中所述信道是控制信道、 广 播信道、 同步信道中的至少之一。
4. 一种小区切换方法, 包括在用户设备上执行以下步骤:
预设步骤, 预先设定信道的信干噪比阈值;
搜索步骤, 搜索满足小区切换触发条件的一组或一个邻居小区作为候选邻居小 区;
测量步骤, 测量所述候选邻居小区的参考信号接收功率 RSRP; 计算步骤, 计算所述候选邻居小区的信干噪比;
信干噪比预判决步骤,
选择当前候选邻居小区中 RSRP最大的一个候选邻居小区,
如果所述候选邻居小区的信干噪比比所述信干噪比阈值大, 则选择当前候选邻 居小区作为切换小区;
如果所述候选邻居小区的信干噪比比所述信干噪比阈值小,则选择 RSRP次大的 另一个邻居小区执行所述测量步骤、 计算步骤和信干噪比预判决步骤;
若在候选小区中没有满足预先设定的信干噪比阈值要求的,则直接选择 RSRP最 大的小区作为切换小区;
将满足小区切换触发条件和信干噪比阈值的小区报告给基站;
然后, 由基站决定切换到哪个小区。
5. 根据权利要求 4所述的小区切换方法, 其中对服务小区和邻居小区之间的参 考信号接收功率进行比较来选择满足切换触发条件的邻居小区。
6. 根据权利要求 4所述的小区切换方法, 其中所述计算邻居小区的信干噪比包 括:
UE向 eNB或低功率节点报告满足切换标准的所有小区的测量;
eNB或低功率节点基于来自 UE的 RSRP和 RSRQ信息来计算 SINR;
eNB或低功率节点根据所述 SINR进行小区切换。
7. 一种用户设备, 包括以下部件:
预设装置, 预先设定信道的信干噪比阈值;
搜索装置, 搜索一组满足小区选择条件的候选小区;
测量装置, 测量所述候选小区的参考信号接收功率 RSRP;
计算装置, 计算所述候选小区的信干噪比;
信干噪比预判决装置,
选择 RSRP最大的一个候选小区,
如果所述候选小区的信干噪 比所述信干噪比阈值大, 则选择当前的候选小区 作为服务小区; 如果所述候选小区的信干噪比比所述信干噪比阈值小,则选择 RSRP次大的另一 个候选小区通过所述测量装置执行测量、 通过所述计算装置执行计算和通过所述信 干噪比预判决装置执行信干噪比预判决;
若在候选小区中没有满足预先设定的信干噪比阈值要求的,则直接选择 RSRP最 大的小区接入。
8. 根据权利要求 7所述的用户设备, 其中
所述测量装置从候选小区中选择一个小区作为假设的服务小区, 选择其他小区 作为邻居小区; 以及
所述计算装置将来自假设服务小区的 RSRP与来自各个邻居小区的 RSRP之和之 间的比率作为计算的信干噪比。
9.根据权利要求 7-8中任一项所述的小区选择方法,其中所述信道是控制信道、 广播信道、 同步信道中的至少之一。
10. 一种用户设备, 包括以下装置:
预设装置, 预先设定信道的信干噪比阈值;
搜索装置, 搜索满足小区切换触发条件的一组或一个邻居小区作为候选邻居小 区;
测量装置, 测量所述候选邻居小区的参考信号接收功率 RSRP;
计算装置, 计算所述候选邻居小区的信干噪比;
信干噪比预判决装置,
选择 RSRP最大的一个候选邻居小区,
如果所述候选邻居小区的信干噪比比所述信干噪比阈值大, 则选择当前候选邻 居小区作为切换小区;
如果所述候选邻居小区的信干噪比比所述信干噪比阚值小,则选择 RSRP次大的 另一个候选邻居小区通过所述测量装置执行所述测量、 通过所述计算装置执行计算 和通过所述信干噪比预判决装置执行信干噪比预判决;
若在候选小区中没有满足预先设定的信干噪比阈值要求的,则直接选择 RSRP最 大的邻居小区; 报告装置, 将满足小区切换触发条件和信干噪比阈值的小区报告给基站。
11. 根据权利要求 10所述的用户设备, 其中所述搜索装置对服务小区和邻居小 区之间的参考信号接收功率进行比较来选择满足切换触发条件的邻居小区。
12. 根据权利要求 10所述的用户设备, 其中所述计算装置包括:
报告装置, 向 eNB或低功率节点报告满足切换标准的所有小区的测量; 第二计算装置, eNB或低功率节点基于来自所述报告装置的 RSRP和 RSRQ信息 来计算 SINR;
小区切换装置, eNB或低功率节点根据所述 SINR进行小区切换。
13. 一种基站, 从根据权利要求 11-12中任一项中所的用户设备接收满足小区 切换触发条件和信干噪比阈值的小区报告, 决定切换到哪个小区。
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