WO2013026408A1 - 随机接入方法和设备 - Google Patents

随机接入方法和设备 Download PDF

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Publication number
WO2013026408A1
WO2013026408A1 PCT/CN2012/080563 CN2012080563W WO2013026408A1 WO 2013026408 A1 WO2013026408 A1 WO 2013026408A1 CN 2012080563 W CN2012080563 W CN 2012080563W WO 2013026408 A1 WO2013026408 A1 WO 2013026408A1
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Prior art keywords
user equipment
random access
initial access
cell
access power
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PCT/CN2012/080563
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English (en)
French (fr)
Inventor
韩世进
李彬
朱希云
郭长玉
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华为技术有限公司
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Publication of WO2013026408A1 publication Critical patent/WO2013026408A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access

Definitions

  • RANDOM ACCESS METHOD AND APPARATUS The present application claims priority to Chinese Patent Application No. 201110244040.7, entitled “Random Access Method and Apparatus”, filed on August 24, 2011, the entire contents of which are incorporated by reference. Combined in this application.
  • TECHNICAL FIELD Embodiments of the present invention relate to the field of communications, and in particular, to a random access method and apparatus.
  • LTE Long Term Evolution
  • LTE defines three types of uplink channels: Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH) and Physical Random Access Channel (hereinafter). Referred to as PRACH).
  • Two uplink reference signals are also defined: Demodulation Reference Signal (DMRS) and Sounding Reference Signal (SRS).
  • DMRS Demodulation Reference Signal
  • SRS Sounding Reference Signal
  • the PUSCH channel is used for uplink data transmission, and the PUCCH channel user uplink signaling is used.
  • the PRACH is used for user equipment (User Equipment, hereinafter referred to as UE) random access.
  • the DMRS is used for measurement and demodulation related to PUSCH and PUCCH
  • the SRS is used to measure uplink channel information.
  • RACH is mainly used for initial access of UEs, which does not carry any user data, and RACH is transmitted through a physical random access channel (PRACH).
  • PRACH physical random access channel
  • the signal transmitted by the UE on the PRACH channel is a Preamble Sequence (hereinafter referred to as Preamble).
  • the preamble is listed as a Zadoff-Chu sequence (hereinafter referred to as a ZC sequence).
  • the SRS signal is periodically sent to the base station according to the configuration of the base station. Since the SRS is also a ZC sequence, in a specific case, the signal of the neighboring area (such as PRACH, etc.) may be interfered, that is, the SRS signal is received. The neighboring base station mistakenly believes that the UE requests access.
  • the UE sends a PRACH sequence according to the time-frequency resource configured by the base station, and the base station periodically detects according to the same configuration, uses the local sequence and the received signal correlation, and determines whether the user needs to access by detecting whether the peak exceeds the detection threshold.
  • One of the technical problems to be solved by the embodiments of the present invention is to suppress false access of user equipment caused by interference in a cell, and improve the initial access success rate of the user equipment.
  • a random access method is proposed, where the method includes:
  • the user equipment in the cell is notified to increase the initial access power, and/or the random access detection threshold is increased.
  • a base station includes: a first determining unit, configured to determine, according to a random access detection threshold, whether the user equipment initiates random access;
  • a sending unit configured to send a random access response to the user equipment when the determining result of the first determining unit is that the user equipment initiates random access
  • a second determining unit configured to determine, after the sending unit sends the random access response, whether the radio resource control connection request sent by the user equipment is received;
  • an accumulating unit configured to determine, when the second judging unit determines that the radio resource control connection request sent by the user equipment is not received, to determine that the user equipment is a fake access, and accumulate the number of false accesses;
  • control unit configured to notify a user equipment in the cell to increase initial access power when the number of false accesses accumulated by the accumulating unit exceeds a preset first threshold, and/or to improve the random access detection threshold .
  • 1 is a signaling interaction diagram in a random access procedure
  • FIG. 3 is a flow chart of a specific scheme of a method according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. . All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • UE User Equipment
  • Mobile Terminals mobile user equipment, etc.
  • a radio access network eg, RAN, Radio Access Network
  • the telephone and the computer having the mobile terminal may be portable, pocket, handheld, computer built-in or in-vehicle mobile devices that exchange language and/or data with the wireless access network.
  • the base station may be an evolved base station in LTE (eNB or e-NodeB, evolutional Node
  • eNB evolved base station in LTE
  • e-NodeB evolutional Node
  • the base station broadcasts the initial access power of the user equipment (User Equipment, referred to as "UE") through a System Information Block (“SIB”), and the UE adjusts the power of the Preamble ID according to the downlink path loss.
  • UE User Equipment
  • SIB System Information Block
  • the base station uses a fixed detection threshold to detect the user's access situation, and does not adjust the initial access power of the UE, but directly discards the user exceeding the specification according to the processing capability of the system.
  • the UE fails to access for the first time, the UE will increase the transmission power and try to access again.
  • FIG. 1 is a signaling interaction diagram involved in a random access method.
  • the UE transmits a random access preamble sequence to the eNB.
  • the eNB After receiving the random access preamble sequence sent by the UE, the eNB sends a random access response to the UE. If the real UE sends a random access request, the UE returns a Radio Resource Control Connection Request (RRC Connection Request). Based on this, the eNB can judge that the random access request is a real random access. Conversely, if the RRC Connection Request is not received, the eNB considers the random access to be a false access.
  • RRC Connection Request Radio Resource Control Connection Request
  • FIG. 2 is a flow chart of a random access method 200 in accordance with an embodiment of the present invention. as shown in picture 2,
  • the base station determines, according to the random access detection threshold, whether the user equipment initiates a random access. Generally, the base station sends the initial access power of the UE to the UE by using an SIB message. The UE sends a random access request to the base station according to the initial access power, and the random access request appears as a ZC sequence. After receiving the random access ZC sequence sent by the UE, the base station performs related processing and other processing on the local reference root sequence. After processing, the peak value in the corresponding window is higher than the random access detection threshold, and the random access request is considered. Random access reporting base that is higher than the random access detection threshold The station executives perform subsequent processing. In this process, since the interference signal sent by the UE in the neighboring cell is also a ZC sequence, when the interference signal is strong, the base station may consider that the UE of the neighboring cell also initiates a random access request.
  • the base station determines whether the random access of the UE is a virtual access according to whether the RRC Connection Request sent by the UE is received after the random access response is sent, and if the virtual access is virtual, the number of virtual accesses is accumulated.
  • the random access detection threshold when the accumulated number of false accesses exceeds a preset first threshold, the random access detection threshold may be increased.
  • the peak of most of the lower-power false access ZC sequences will be lower than the random access detection threshold, and the base station will not consider these ZC sequences as access requests, thus effectively reducing the number of false accesses.
  • the first access request of a part of the UE fails due to the increase of the random access detection threshold. In this case, the UE can automatically increase the access power and re-issue the access request, so that the access can be successfully succeeded.
  • the UE may be notified to increase the initial access power while increasing the random access detection threshold.
  • the base station can notify the UE to increase the initial access power in two ways. One is that a notification message can be sent to the UE in the cell, and the user equipment in the cell is notified by the notification message to increase the initial access power. The other is that the base station can broadcast the increased initial access power to the UEs in the cell through the SIB message.
  • the occurrence of false access can be suppressed and the user equipment can be improved. Access success rate.
  • the random access detection threshold and the notification cell are improved in synchronization
  • the amplitude of the initial access power of the user equipment in the notification cell is set according to the improvement range of the random access detection threshold.
  • the user equipment in the cell before the user equipment in the cell is notified to increase the initial access power, it is determined whether the initial access power of the user equipment has been adjusted to a preset initial access power upper limit, if the result of the determination If not, the user equipment in the cell is notified to increase the initial access power.
  • the user equipment in the cell when the number of the fake accesses is lower than the preset second threshold, the user equipment in the cell is notified to reduce the initial access power, and/or the random access detection threshold is lowered.
  • the UE in the cell is notified to lower the random access detection threshold. In this case, the success rate of the UE's first access can be improved.
  • the UE may be notified to reduce the initial access power while reducing the random access detection threshold. This can reduce the power used by the UE when it is randomly accessed, and thus reduce the power consumption of the UE and the interference of the UE to neighboring cells.
  • the base station can notify the UE to reduce the initial access power in two ways. One is that a notification message can be sent to the UE in the cell, by which the user equipment in the cell is notified to reduce the initial access power. The other is that the base station can broadcast the reduced initial access power to the UEs in the cell through the SIB message.
  • the user equipment in the notification cell reduces the initial access power according to the Set by the reduction of the random access detection threshold.
  • the user equipment in the cell before the user equipment in the cell is notified to reduce the initial access power, it is determined whether the initial access power of the user equipment has been adjusted to a preset initial access power lower limit, if the result of the determination If not, the user equipment in the cell is notified to reduce the initial access power.
  • FIG. 3 is a flowchart of a random access method according to an embodiment of the present invention. As shown in Figure 3,
  • the eNB air interface sends the initial access power of the UE.
  • the eNB determines, according to the random access detection threshold, whether the UE initiates random access. If the result of the determination is that the UE initiates random access, step 330 is performed. 330: The eNB sends a random access response to the UE.
  • the eNB determines whether the RRC Connection Request sent by the UE is received after the random access response is sent.
  • the eNB If the RRC Connection Request sent by the UE is received, the eNB considers that the access is a real random access, and returns to step 320. If the RRC Connection Request sent by the UE is not received, it is determined that the access is a fake access, and step 350 is performed.
  • step 370 Determine whether the predetermined detection period (for example, 1 minute) is exceeded. If the judgment result is that the predetermined detection period is exceeded, step 370 is performed.
  • step 370 Determine whether the accumulated number of false accesses exceeds a preset first threshold (for example, 100 times). If the preset first threshold is not exceeded, the detection cycle is reset and returns to step 320. If the result of the determination is that the first threshold is exceeded, step 380 is performed.
  • a preset first threshold for example, 100 times.
  • step 390 Determine whether the initial access power exceeds a preset initial access power upper limit (for example, -10dmb). If the result of the determination is that the preset initial access power upper limit has been reached, the base station upper layer is reported and the method ends. If the result of the determination is that the preset initial access power upper limit is not reached, step 390 is performed.
  • a preset initial access power upper limit for example, -10dmb
  • step 390 Increase the initial access power by one step (for example, 2 db) while raising the random access detection threshold by one step.
  • the step size of the random access detection threshold increase can be determined based on the increased step size of the initial access power.
  • the eNB may broadcast a new boosted initial access power to the UEs in the cell through the SIB message.
  • the RRC Connection Request sent by the UE is received after the sending of the random access response to determine whether it is a real random access of the UE, and the reliability of the determination result is guaranteed;
  • the number of false accesses accumulated during the detection period can maintain the stability of the system and avoid frequent changes of the initial access power. Broadcasting the newly enhanced initial access power to the UEs in the cell through the SIB message can be conveniently unified.
  • the UE improves the initial initial access power of all the UEs in the cell. Before the initial access power of the UE is increased, it is determined whether the initial access power has been adjusted to a preset initial access power upper limit.
  • the preset access power can be increased to allow the initial access power to be accurately controlled, and the step size of the random access detection threshold can be determined according to the step size of the initial access power, which can be improved.
  • the stability of the random access detection threshold adjustment can be performed.
  • FIG. 4 is a flowchart of another specific implementation of the embodiment of the present invention, as shown in FIG. 4: 410: The initial access power of the UE is sent by the eNB air interface.
  • the eNB determines, according to the random access detection threshold, whether the UE initiates random access. If the judgment result is that the UE initiates random access, step 430 is performed.
  • the eNB sends a random access response to the UE.
  • the eNB determines whether the RRC Connection Request sent by the UE is received after the random access response is sent, and if the RRC connection request sent by the UE is received, the eNB considers that the access is a real random access. Then, the process returns to step 420. If the RRC Connection Request sent by the UE is not received, it is determined that the access is a false access, and step 450 is performed.
  • step 460 Determine if the predetermined detection period (such as 1 minute) is exceeded. If the result of the determination is that the predetermined detection period is exceeded, then step 470 is performed.
  • the predetermined detection period such as 1 minute
  • step 470 Determine whether the accumulated false access number is lower than a preset second threshold (for example, 10 times). If the preset second threshold is exceeded, the detection cycle is reset and returns to step 420. If the result of the determination is lower than the second threshold of the preset, step 480 is performed.
  • a preset second threshold for example, 10 times.
  • 480 Determine whether the initial access power is lower than a preset initial access power lower limit (for example, -25dmb). If the result of the determination is that the preset initial access power lower limit has been reached, the method ends and no processing is performed. If the result of the determination is that the preset initial access power lower limit is not reached, the process proceeds to 490.
  • a preset initial access power lower limit for example, -25dmb
  • the step size of the random access detection threshold reduction can be determined based on the reduced step size of the initial access power.
  • the eNB may broadcast a new reduced initial access power to the UEs in the cell through the SIB message.
  • the RRC Connection Request sent by the UE is received after the sending the random access response, to determine whether it is a real random access of the UE, The reliability of the judgment result is ensured; the number of false accesses is accumulated in a preset detection period, the stability of the system can be maintained, and the initial access power is frequently changed; the new UE is broadcasted to the UE in the cell through the SIB message.
  • the reduced initial access power can be used to conveniently reduce the initial reduced access power of all UEs in the cell. Before reducing the initial access power of the UE, determine whether the initial access power has been adjusted to the preset.
  • the initial access power lower limit may provide a protection mechanism to prevent the initial access power from being too low to cause a system failure or the UE cannot achieve effective random access; the initial access power may be reduced by a preset step size, allowing The system is precisely controlled; the step size of the random access detection threshold is determined according to the reduced step size of the initial access power, which can improve the stability of the random access detection threshold adjustment.
  • FIG. 3 and FIG. 4 can be integrated to form another embodiment of the present invention.
  • the UE According to the comparison between the accumulated number of false accesses and the first threshold and the second threshold, the UE is respectively increased or decreased according to the comparison. Initial access power. Based on this, the random access detection threshold can be increased or decreased.
  • the first threshold may be greater than or equal to the second threshold.
  • FIG. 5 is a schematic structural diagram of a base station 500 in an LTE system.
  • the base station device 500 includes: a first determining unit 510, configured to determine, according to the random access detection threshold, whether the user equipment initiates random access, and the sending unit 520, configured to determine, by the first determining unit 510, that the user equipment is initiated.
  • the random access response is sent to the user equipment.
  • the second determining unit 530 is configured to determine whether the radio resource control sent by the user equipment is received after the sending unit 520 sends the random access response.
  • the accumulating unit 540 configured to determine, by the second determining unit 530, that the radio resource control connection request sent by the user equipment is not received, determine that the user equipment is a fake access, and accumulate the number of false accesses
  • the control unit 550 is configured to notify the user equipment in the cell to increase the initial access power when the number of false accesses accumulated by the accumulating unit 540 exceeds a preset first threshold, and/or improve the random access. Enter the detection threshold.
  • the accumulating unit 540 accumulates the number of spurious accesses within a predetermined detection period (e.g., 1 minute). The number of false accesses accumulated after the accumulation unit 540 exceeds the preset When the first threshold (for example, 100 times), the control unit 550 notifies the user equipment in the cell to increase the initial access power.
  • a predetermined detection period e.g. 1 minute.
  • the control unit 550 notifies the user equipment in the cell to increase the initial access power.
  • control unit 550 is configured to broadcast the increased initial access power to the user equipment in the cell by using the SIB message.
  • the control unit 550 may also send a notification message to the user equipment in the cell, by using the notification message to notify the user equipment in the cell to increase the initial access power.
  • control unit 550 may increase the initial access power by one step (for example, 2 db) while raising the random access detection threshold by one step.
  • the user equipment in the notification cell increases the initial access power according to the amplitude.
  • the increase in the random access detection threshold is set by the control unit.
  • control unit 550 is further configured to: before the user equipment in the cell is notified to increase the initial access power, determine whether the initial access power of the user equipment has been adjusted to a preset initial connection. The upper limit of the power input, if the result of the determination is no, the control unit 550 notifies the user equipment in the cell to increase the initial access power.
  • control unit 550 is further configured to: when the number of the fake accesses is lower than a preset second threshold (for example, 10 times), notify the user equipment in the cell to reduce the initial access power, and / or, reduce the random access detection threshold.
  • a preset second threshold for example, 10 times
  • control unit 550 is configured to broadcast the reduced initial access power to the user equipment in the cell by using the SIB message.
  • the control unit 550 may also send a notification message to the user equipment in the cell, by using the notification message to notify the user equipment in the cell to reduce the initial access power.
  • the control unit 550 may reduce the initial access power by one step (e.g., 2 db) while reducing the random access detection threshold by one step.
  • the user equipment in the notification cell reduces the initial access power according to the amplitude.
  • the random access detection threshold is reduced by the amplitude
  • the control unit 550 is set.
  • control unit 550 is further configured to: before the user equipment in the cell is notified to reduce the initial access power, determine whether the initial access power of the user equipment has been adjusted to a preset initial connection. The lower limit of the incoming power, if the result of the determination is no, the control unit notifies the user equipment in the cell to reduce the initial access power.
  • the steps of a method or algorithm described in connection with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both.
  • the software module can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical field. Any other form of storage medium known.

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Abstract

公开了随机接入方法和设备。该方法包括：根据随机接入检测门限，判断用户设备是否发起随机接入（210）；若判断认为用户设备发起了随机接入，则向用户设备发送随机接入响应（220）；判断在发送随机接入响应后，是否接收到用户设备发送的无线资源控制连接请求（230）；若没有接收到该无线资源控制连接请求，则确定用户设备为虚假接入，并累加虚假接入数量（240）；当累加后的虚假接入数量超过预设的第一门限时，通知小区内的用户设备提高初始接入功率，和/或提高随机接入检测门限（250），通过判断累加的虚假接入数量超过第一门限，并因此提高用户设备的初始接入功率和/或提高随机接入检测门限，可以抑制虚假接入的出现并提高用户设备的接入成功率。

Description

随机接入方法和设备 本申请要求于 2011 年 8 月 24 日提交中国专利局、 申请号为 201110244040.7、发明名称为"随机接入方法和设备 "的中国专利申请的优先 权， 其全部内容通过引用结合在本申请中。 技术领域 本发明实施例涉及通信领域， 更具体地说， 涉及一种随机接入方法和 设备。 背景技术 长期演进系统（ Long Term Evolution , 以下简称 LTE ) 中， 为了提高频 谱利用率， 一般釆用同频组网方式， 相邻小区间频率完全复用。
LTE定义了三种上行信道： 物理上行共享信道（ Physical Uplink Shared Channel, 以下简称 PUSCH ), 物理上行控制信道（ Physical Uplink Control Channel, 以下简称 PUCCH )和物理随机接入信道 ( Physical Random Access Channel, 以下简称 PRACH )。 另外还定义了两种上行参考信号： 解调参考 信号 （Demodulation Reference Signal, 以下简称 DMRS )和探测参考信号 ( Sounding Reference Signal, 以下简称 SRS)。 PUSCH信道用于上行数据传 输， PUCCH信道用户上行信令传输， PRACH用于用户设备 (User Equipment, 以下简称 UE)随机接入。 DMRS用于与 PUSCH及 PUCCH相关的测量及解 调， SRS则用于测量上行信道信息。
在 LTE中， RACH主要用于 UE的初始化接入， 它不携带任何用户数 据， RACH通过物理随机接入信道（ PRACH )发送。 UE在 PRACH信道上 发送的信号为前导序列 （Preamble Sequence, 以下简称 Preamble )。 前导序 列为 Zadoff-Chu序列 （以下简称 ZC序列）。
UE在接入后会根据基站的配置周期性地向基站发送 SRS信号， 由于 SRS也是 ZC序列， 在特定情况下会对邻区的信号（如 PRACH等）产生干 扰， 即接到该 SRS信号的邻区基站误以为该 UE请求接入。 UE根据基站配置的时频资源发送 PRACH序列， 基站根据相同的配置 去周期性检测， 使用本地序列和接收信号相关， 通过检测峰值是否超过检 测门限来判断是否有用户需要接入。 由于检测门限的设置是根据一定的信 道模型在仿真下获得的，但是在实际系统中可能存在着预料之外的干扰（如 邻区 UE发送的 SRS信号等 ), 所以实际系统中总是存在着一定的虚 4叚接入 的概率， 即可能会检测到并不是真正需要接入的用户， 例如邻区的 UE。 当 存在大量虚假接入时， UE的接入成功率会下降。 发明内容 本发明实施例所要解决的其中一个技术问题是抑制小区内因干扰导致 的用户设备虚假接入， 提高用户设备初始接入成功率。
根据本发明实施例， 提出了一种随机接入方法， 其特征在于， 所述方 法包括：
根据随机接入检测门限， 判断用户设备是否发起随机接入；
若判断结果为认为用户设备发起了随机接入， 则向所述用户设备发送 随机接入响应；
判断在发送所述随机接入响应后， 是否接收到所述用户设备发送的无 线资源控制连接请求；
若没有接收到所述用户设备发送的无线资源控制连接请求， 则确定所 述用户设备为虚假接入， 并累加虚假接入数量；
当所述累加后的虚假接入数量超过预设的第一门限时， 通知小区内的 用户设备提高初始接入功率， 和 /或， 提高所述随机接入检测门限。
根据本发明实施例， 提出了一种基站， 其特征在于， 所述基站包括： 第一判断单元， 用于根据随机接入检测门限， 判断用户设备是否发起 随机接入；
发送单元， 用于在第一判断单元的所述判断结果为认为用户设备发起 了随机接入时， 向所述用户设备发送随机接入响应；
第二判断单元， 用于判断在所述发送单元发送所述随机接入响应后， 是否接收到所述用户设备发送的无线资源控制连接请求； 累加单元， 用于在所述第二判断单元判断的结果为没有接收到所述用 户设备发送的无线资源控制连接请求时， 确定所述用户设备为虚假接入， 并累加虚假接入数量；
控制单元， 用于在所述累加单元累加后的虚假接入数量超过预设的第 一门限时， 通知小区内的用户设备提高初始接入功率， 和 /或， 提高所述随 机接入检测门限。
根据本发明实施例， 通过判断累加的虚假接入数量超过第一门限， 并 因此提高用户设备的初始接入功率和 /或提高随机接入检测门限， 可以抑制 虚假接入的出现并提高用户设备的接入成功率。 附图说明 为了更清楚地说明本发明实施例的技术方案， 下面将对实施例或现有 技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面描述中的 附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付 出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。 在附图 中：
图 1是随机接入过程中的信令交互图；
图 2是本发明实施例方法的流程图；
图 3是本发明实施例方法一种具体方案的流程图；
图 4是本发明实施例方法的另一种具体方案的流程图；
图 5是本发明实施例的基站的示意结构图。 具体实施方式 下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进 行清楚、 完整地描述， 显然， 所描述的实施例是本发明一部分实施例， 而 不是全部的实施例。 基于本发明中的实施例， 本领域普通技术人员在没有 做出创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范 围。
用户设备 （ UE , User Equipment ) , 也可称之为移动终端 （ Mobile Terminal ),移动用户设备等，可以经无线接入网（例如， RAN, Radio Access Network )与一个或多个核心网进行通信， 用户设备可以是移动终端， 如移 动电话（或称为"蜂窝"电话）和具有移动终端的计算机， 例如， 可以是便携 式、 袖珍式、 手持式、 计算机内置的或者车载的移动装置， 它们与无线接 入网交换语言和 /或数据。
基站，可以是 LTE中的演进型基站（ eNB或 e-NodeB , evolutional Node
B )。
通常， 基站通过系统消息（ System Information Block, 简称 "SIB" )广 播用户设备 ( User Equipment, 简称 "UE" )初始接入功率， UE根据下行 路损调节其发送前导标识（Preamble ID ) 的功率， 以保证每个 UE到达基 站时的功率基本相同。 一般来说， 基站使用固定的检测门限检测用户的接 入情况， 不对 UE初始接入功率进行调节， 只是根据系统的处理能力， 对超 出规格的用户进行直接丟弃。 当 UE第一次接入失败后， UE会提高发射功 率尝试再次接入。
为解决现有技术中存在的问题， 本发明实施例提供了多种实现方案， 具体描述如下。
图 1是随机接入方法涉及的信令交互图。 如图 1所示， UE向 eNB发 送随机接入前导序列。 eNB在收到 UE发送的随机接入前导序列后， 会向 UE发送随机接入响应。 如果是真实的 UE发送随机接入请求， 则 UE会返 回无线资源控制连接请求 ( Radio Resource Control Connection Request, 简 称 RRC Connection Request )。 eNB据此可以判断此次随机接入请求为真实 的随机接入。 相反， 在未收到 RRC Connection Request的情况下， eNB则 认为此次随机接入为虚假接入。
图 2是本发明实施例的随机接入方法 200的流程图。 如图 2所示，
210: 基站根据随机接入检测门限， 判断用户设备是否发起随机接入； 一般而言， 基站通过 SIB消息将 UE初始接入功率下发给 UE。 UE根 据该初始接入功率向基站发送随机接入请求，该随机接入请求表现为 ZC序 列。基站接收到 UE发送的随机接入 ZC序列后将其与本地参考根序列进行 相关处理及其他处理， 处理后对应窗口中的峰值比随机接入检测门限高则 认为有随机接入请求， 同时将高于随机接入检测门限的随机接入上报给基 站高层进行后续处理。在这一过程中， 由于邻区的 UE发出的干扰信号也是 ZC序列， 在该干扰信号强烈时， 基站可能认为该邻区的 UE也发起随机接 入请求。
220: 若判断结果为认为用户设备发起了随机接入， 则向所述用户设备 发送随机接入响应。
230: 判断在发送所述随机接入响应后， 是否接收到所述用户设备发送 的无线资源控制连接请求。
240: 若没有接收到所述用户设备发送的无线资源控制连接请求， 则确 定所述用户设备为虚假接入， 并累加虚假接入数量。
基站根据下发随机接入响应后是否接收到 UE发送的 RRC Connection Request确定 UE的随机接入是否为虚 4叚接入， 如果是虚 4叚接入， 则累加虚 假接入数量。
250: 当所述累加后的虚假接入数量超过预设的第一门限时， 通知小区 内的用户设备提高初始接入功率， 和 /或， 提高所述随机接入检测门限。
根据本发明实施例， 在累加的虚假接入数量超过预设的第一门限时， 可以提高所述随机接入检测门限。 在这种情况下， 大部分功率较低的虚假 接入 ZC序列的峰值将低于随机接入检测门限，基站将不认为这些 ZC序列 为接入请求， 因此可以有效降低虚假接入数量。 与此同时， 一部分 UE的首 次接入请求因随机接入检测门限提高而失败， 在这种情况下， UE可以自动 提高接入功率再次发出接入请求， 因此可以在后续成功接入。
根据本发明实施例， 也可以在提高随机接入检测门限的同时， 通知 UE 提高初始接入功率。在这种情况下，基站可以通过两种方式通知 UE提高初 始接入功率。一种是可以向小区内的 UE发送通知消息，通过该通知消息通 知所述小区内的用户设备提高初始接入功率。 另一种是基站可以通过 SIB 消息向小区内的 UE广播提高后的初始接入功率。
根据本发明实施例， 通过判断累加的虚假接入数量超过第一门限， 并 因此提高用户设备的初始接入功率和 /或提高随机接入检测门限， 可以抑制 虚假接入的出现并提高用户设备的接入成功率。
根据本发明实施例， 在同步提高所述随机接入检测门限和通知小区内 的用户设备提高初始接入功率的情况下， 所述通知小区内的用户设备提高 初始接入功率的幅度根据所述随机接入检测门限的提高幅度而设定。
根据本发明实施例， 在通知小区内的用户设备提高初始接入功率之前， 判断所述用户设备的初始接入功率是否已被调整至预设的初始接入功率上 限， 如果所述判断的结果为否， 则通知小区内的用户设备提高初始接入功 率。
根据本发明实施例， 当所述虚假接入数量低于预设的第二门限时， 通 知小区内的用户设备降低初始接入功率， 和 /或， 降低所述随机接入检测门 限。 根据本发明实施例， 可选地， 在累加的虚假接入低于预设的第二门限 时， 通知小区内的 UE降低所述随机接入检测门限。 在这种情况下， 可以提 高 UE首次接入的成功率。根据本发明实施例，也可以在降低所述随机接入 检测门限的同时， 通知 UE降低初始接入功率。 这样可以降低 UE随机接入 时所使用的功率， 并因此降低 UE的功耗以及 UE对相邻小区的干扰。
同样，基站可以通过两种方式通知 UE降低初始接入功率。一种是可以 向小区内的 UE发送通知消息，通过该通知消息通知所述小区内的用户设备 降低初始接入功率。另一种是基站可以通过 SIB消息向小区内的 UE广播降 低后的初始接入功率。
根据本发明实施例， 在同步降低所述随机接入检测门限和通知小区内 的用户设备降低初始接入功率的情况下， 所述通知小区内的用户设备降低 初始接入功率的幅度根据所述随机接入检测门限的降低幅度而设定。
根据本发明实施例， 在通知小区内的用户设备降低初始接入功率之前， 判断所述用户设备的初始接入功率是否已被调整至预设的初始接入功率下 限， 如果所述判断的结果为否， 则通知小区内的用户设备降低初始接入功 率。
以下结合本发明实施例的具体实现方案进一步阐述本发明实施例的原 理。 图 3是本发明实施例的随机接入方法的流程图。 如图 3所示，
310: eNB空口下发 UE初始接入功率。
320: eNB根据随机接入检测门限， 判断 UE是否发起随机接入。 若判 断结果为 UE发起随机接入， 则执行步骤 330。 330: eNB向 UE发送随机接入响应。
340: eNB判断在发送所述随机接入响应后，是否接收到 UE发送的 RRC Connection Request。
若接收到 UE发送的 RRC Connection Request,则 eNB认为此次接入为 真实的随机接入， 则返回至步骤 320。 若没有接收到 UE 发送的 RRC Connection Request, 则确定此次接入为虚假接入， 执行步骤 350。
350: 累加虚假接入数量；
360: 判断是否超过预定检测周期 （如 1 分钟）， 若判断结果为超过预 定检测周期， 则执行步骤 370。
370: 判断累加的虚假接入数量是否超过预设的第一门限（例如， 100 次）。 若未超过该预设的第一门限， 则将检测周期重置并返回步骤 320。 若 判断结果为超过该预设的第一门限， 则执行步骤 380。
380 : 判断初始接入功率是否超过预设的初始接入功率上限 （例如 -10dmb )。 若判断结果为已经达到所述预设的初始接入功率上限， 则上报基 站高层且方法结束。 若判断结果为未达到所述预设的初始接入功率上限， 则执行步骤 390。
390: 将初始接入功率提高一个步长（例如， 2db ), 同时升高所述随机 接入检测门限一个步长。 如前所述， 随机接入检测门限升高的步长幅度可 以根据初始接入功率的升高步长幅度来确定。
eNB可以通过 SIB消息向小区内的 UE广播新的提高后的初始接入功 率。
根据本发明实施例， 通过判断在发送所述随机接入响应后， 是否接收 到 UE发送的 RRC Connection Request来确定是否为 UE的真实随机接入， 保证了判断结果的可靠性； 在预设的检测周期内累加虚假接入的数量， 可 以保持系统的稳定性， 避免初始接入功率频繁地发生变化； 通过 SIB 消息 向小区内的 UE广播新的提高后的初始接入功率，可以方便地统一提高小区 内所有 UE使用新的提高后的初始接入功率；在提高 UE的初始接入功率之 前， 判断初始接入功率是否已被调整至预设的初始接入功率上限， 可以提 供一种保护机制， 以免初始接入功率过高而导致系统故障或者损坏 UE; 通 过可以预设的步长来提高初始接入功率， 允许对系统进行精确的控制； 随 机接入检测门限升高的步长幅度可以根据初始接入功率的升高步长幅度来 确定， 可以提高随机接入检测门限调整的稳定性。
图 4是本发明实施例的另一种具体实现方案的流程图， 如图 4所示： 410: eNB空口下发 UE初始接入功率。
420: eNB根据随机接入检测门限， 判断 UE是否发起随机接入。 若判 断结果为 UE发起随机接入， 则执行步骤 430。
430: eNB向 UE发送随机接入响应。
440: eNB判断在发送所述随机接入响应后，是否接收到 UE发送的 RRC Connection Request„ 若接^：到 UE发送的 RRC Connection Request,则 eNB 认为此次接入为真实的随机接入， 则返回至步骤 420。 若没有接收到 UE发 送的 RRC Connection Request,则确定此次接入为虚假接入，执行步骤 450。
450: 累加虚假接入数量；
460: 判断是否超过预定检测周期 （如 1 分钟）。 若判断结果为超过预 定检测周期， 则执行步骤 470。
470:判断累加的虚假接入数量是否低于预设的第二门限（例如， 10次）。 若超过该预设的第二门限， 则将检测周期重置并返回步骤 420。 若判断结果 为低于该预设的第二门限， 则执行步骤 480。
480 : 判断初始接入功率是否低于预设的初始接入功率下限 （例如 -25dmb )。 若判断结果为已经达到所述预设的初始接入功率下限， 则方法结 束， 不作处理。 若判断结果为未达到所述预设的初始接入功率下限， 则过 程行进到 490。
490: 将初始接入功率降低一个步长（例如， 2db ), 同时降低所述随机 接入检测门限一个步长。 如前所述， 随机接入检测门限降低的步长幅度可 以根据初始接入功率的降低步长幅度来确定。
eNB可以通过 SIB消息向小区内的 UE广播新的降低后的初始接入功 率。
根据本发明实施例， 通过判断在发送所述随机接入响应后， 是否接收 到 UE发送的 RRC Connection Request来确定是否为 UE的真实随机接入， 保证了判断结果的可靠性； 在预设的检测周期内累加虚假接入的数量， 可 以保持系统的稳定性， 避免初始接入功率频繁地发生变化； 通过 SIB 消息 向小区内的 UE广播新的降低后的初始接入功率，可以方便地统一降低小区 内所有 UE使用新的降低后的初始接入功率；在降低 UE的初始接入功率之 前， 判断初始接入功率是否已被调整至预设的初始接入功率下限， 可以提 供一种保护机制，以免初始接入功率过低而导致系统故障或者 UE无法实现 有效的随机接入； 通过可以预设的步长来降低初始接入功率， 允许对系统 进行精确的控制； 随机接入检测门限降低的步长幅度根据初始接入功率的 降低步长幅度来确定， 可以提高随机接入检测门限调整的稳定性。
图 3和图 4所示本发明实施例可以整合在一起， 构成本发明另一种实 施例， 根据累加的虚假接入数量与第一门限和第二门限的比较， 相应地分 别提高或降低 UE的初始接入功率。在此基础上，可以提高或降低所述随机 接入检测门限。
根据本发明实施例， 第一门限可以大于或等于第二门限。
本发明实施例还提出了一种用来实现本发明实施例的随机接入方法的 基站， 如图 5所示。 图 5是 LTE系统中基站 500的示意结构图。
基站设备 500包括： 第一判断单元 510 , 用于根据随机接入检测门限， 判断用户设备是否发起随机接入； 发送单元 520, 用于在第一判断单元 510 的判断结果为认为用户设备发起了随机接入时， 向所述用户设备发送随机 接入响应； 第二判断单元 530, 用于判断在发送单元 520发送所述随机接入 响应后， 是否接收到所述用户设备发送的无线资源控制连接请求； 累加单 元 540,用于在第二判断单元 530判断的结果为没有接收到所述用户设备发 送的无线资源控制连接请求， 确定所述用户设备为虚假接入， 并累加虚假 接入数量； 控制单元 550, 用于在所述累加单元 540累加后的虚假接入数量 超过预设的第一门限时， 通知小区内的用户设备提高初始接入功率， 和 /或， 提高所述随机接入检测门限。
根据本发明实施例的方法部分所述的特征可以适用于本发明实施例的 基站。
根据本发明实施例， 累加单元 540在预定的检测周期 （如 1分钟） 内 累加虚假接入的数量。 在累加单元 540 累加后的虚假接入数量超过预设的 第一门限（例如， 100次）时， 控制单元 550通知小区内的用户设备提高初 始接入功率。
具体来说， 根据本发明实施例， 控制单元 550用于通过 SIB消息向所 述小区内的用户设备广播提高后的初始接入功率。 可选地， 控制单元 550 也可以向所述小区内的用户设备发送通知消息， 通过所述通知消息通知所 述小区内的用户设备提高初始接入功率。
根据本发明实施例， 在提高初始接入功率时， 控制单元 550可以将初 始接入功率提高一个步长（例如， 2db ), 同时升高所述随机接入检测门限 一个步长。
根据本发明进一步的实施例， 在同步提高所述随机接入检测门限和通 知小区内的用户设备提高初始接入功率的情况下， 所述通知小区内的用户 设备提高初始接入功率的幅度根据所述随机接入检测门限的提高幅度而由 所述控制单元设定。
根据本发明实施例， 可选地， 控制单元 550还用于在通知小区内的用 户设备提高初始接入功率之前， 判断所述用户设备的初始接入功率是否已 被调整至预设的初始接入功率上限， 如果所述判断的结果为否， 则所述控 制单元 550通知小区内的用户设备提高初始接入功率。
根据本发明进一步的实施例， 控制单元 550还用于在所述虚假接入数 量低于预设的第二门限（例如， 10次） 时， 通知小区内的用户设备降低初 始接入功率， 和 /或， 降低所述随机接入检测门限。
才艮据本发明实施例， 控制单元 550用于通过 SIB消息向所述小区内的 用户设备广播降低后的初始接入功率。 可选地， 控制单元 550也可以向所 述小区内的用户设备发送通知消息， 通过所述通知消息通知所述小区内的 用户设备降低初始接入功率。
根据本发明实施例， 在降低初始接入功率时， 控制单元 550可以将初 始接入功率降低一个步长（例如， 2db ), 同时降低所述随机接入检测门限 一个步长。
根据本发明进一步的实施例， 在同步降低所述随机接入检测门限和通 知小区内的用户设备降低初始接入功率的情况下， 所述通知小区内的用户 设备降低初始接入功率的幅度根据所述随机接入检测门限的降低幅度而由 所述控制单元 550设定。
根据本发明实施例， 可选地， 控制单元 550还用于在通知小区内的用 户设备降低初始接入功率之前， 判断所述用户设备的初始接入功率是否已 被调整至预设的初始接入功率下限， 如果所述判断的结果为否， 则所述控 制单元通知小区内的用户设备降低初始接入功率。
本领域普通技术人员可以理解， 本文中所公开的方法和系统仅为示例 性质， 并且方法所包含的过程并非限于文中所述的顺序， 而是可以根据具 体需要以及技术实现的便利性进行调整。 除了上述例举的内容之外， 根据 具体应用场合的需要， 所述方法和系统还可以包括其他过程和模块。
本领域普通技术人员可以意识到， 结合本文中所公开的实施例描述的 各示例的单元及算法步骤， 能够以电子硬件、 计算机软件或者二者的结合 来实现， 为了清楚地说明硬件和软件的可互换性， 在上述说明中已经按照 功能一般性地描述了各示例的组成及步骤。 这些功能究竟以硬件还是软件 方式来执行， 取决于技术方案的特定应用和设计约束条件。 专业技术人员 可以对每个特定的应用来使用不同方法来实现所描述的功能， 但是这种实 现不应认为超出本发明的范围。
结合本文中所公开的实施例描述的方法或算法的步骤可以用硬件、 处 理器执行的软件模块， 或者二者的结合来实施。 软件模块可以置于随机存 储器（RAM )、 内存、 只读存储器（ROM )、 电可编程 ROM、 电可擦除可 编程 ROM、 寄存器、 硬盘、 可移动磁盘、 CD-ROM、 或技术领域内所公知 的任意其它形式的存储介质中。
尽管已示出和描述了本发明的一些实施例， 但本领域技术人员应理解， 在不脱离本发明的原理和精神的情况下， 可对这些实施例进行各种修改， 这样的修改应落入本发明的范围内。

Claims

权利要求
1. 一种随机接入方法， 其特征在于， 所述方法包括：
根据随机接入检测门限， 判断用户设备是否发起随机接入；
若判断结果为认为用户设备发起了随机接入， 则向所述用户设备发送 随机接入响应；
判断在发送所述随机接入响应后， 是否接收到所述用户设备发送的无 线资源控制连接请求；
若没有接收到所述用户设备发送的无线资源控制连接请求， 则确定所 述用户设备为虚假接入， 并累加虚假接入数量；
当所述累加后的虚假接入数量超过预设的第一门限时， 通知小区内的 用户设备提高初始接入功率， 和 /或， 提高所述随机接入检测门限。
2. 如权利要求 1所述的随机接入方法， 其特征在于， 所述通知小区内 的用户设备提高初始接入功率包括：
通过系统消息向所述小区内的用户设备广播提高后的初始接入功率。
3. 如权利要求 2所述的随机接入方法， 其特征在于， 在同步提高所述 随机接入检测门限和通知小区内的用户设备提高初始接入功率的情况下， 所述通知小区内的用户设备提高初始接入功率的幅度根据所述随机接入检 测门限的提高幅度而设定。
4. 如权利要求 1至 3任一项所述的方法， 其特征在于， 所述方法还包 括：
在通知小区内的用户设备提高初始接入功率之前， 判断所述用户设备 的初始接入功率是否已被调整至预设的初始接入功率上限；
如果所述判断的结果为否， 则通知小区内的用户设备提高初始接入功 率。
5. 如权利要求 1所述的随机接入方法， 其特征在于， 所述方法还包括： 当所述累加后的虚假接入数量低于预设的第二门限时， 通知小区内的 用户设备降低初始接入功率， 和 /或， 降低所述随机接入检测门限。
6. 如权利要求 5所述的方法， 其特征在于， 所述通知小区内的用户设 备降低初始接入功率， 包括：
通过系统消息向所述小区内的用户设备广播降低后的初始接入功率。
7. 如权利要求 6所述的方法， 其特征在于，
在同步降低所述随机接入检测门限和通知小区内的用户设备降低初始 接入功率的情况下， 所述通知小区内的用户设备降低初始接入功率的幅度 根据所述随机接入检测门限的降低幅度而设定。
8. 如权利要求 5至 7任一项所述的方法， 其特征在于， 所述方法还包 括：
在通知小区内的用户设备降低初始接入功率之前， 判断所述用户设备 的初始接入功率是否已被调整至预设的初始接入功率下限；
如果所述判断的结果为否， 则通知小区内的用户设备降低初始接入功 率。
9. 一种基站， 其特征在于， 所述基站包括：
第一判断单元， 用于根据随机接入检测门限， 判断用户设备是否发起 随机接入；
发送单元， 用于在所述第一判断单元的判断结果为认为用户设备发起 了随机接入时， 向所述用户设备发送随机接入响应；
第二判断单元， 用于判断在所述发送单元发送所述随机接入响应后， 是否接收到所述用户设备发送的无线资源控制连接请求；
累加单元， 用于在所述第二判断单元判断的结果为没有接收到所述用 户设备发送的无线资源控制连接请求时， 确定所述用户设备为虚假接入， 并累加虚假接入数量；
控制单元， 用于在所述累加单元累加后的虚假接入数量超过预设的第 一门限时， 通知小区内的用户设备提高初始接入功率， 和 /或， 提高所述随 机接入检测门限。
10. 如权利要求 9所述的基站， 其特征在于， 所述控制单元具体用于 通过系统消息向所述小区内的用户设备广播提高后的初始接入功率。
11. 如权利要求 9或 10所述的基站， 其特征在于， 所述控制单元还用 于在通知小区内的用户设备提高初始接入功率之前， 判断所述用户设备的 初始接入功率是否已被调整至预设的初始接入功率上限， 如果所述判断的 结果为否， 则所述控制单元通知小区内的用户设备提高初始接入功率。
12. 如权利要求 9所述的基站， 其特征在于， 所述控制单元还用于在 所述虚假接入数量低于预设的第二门限时， 通知小区内的用户设备降低初 始接入功率， 和 /或， 降低所述随机接入检测门限。
13. 如权利要求 12所述的基站， 其特征在于， 所述控制单元具体用于 通过系统消息向所述小区内的用户设备广播降低后的初始接入功率。
14. 如权利要求 12或 13所述的基站， 其特征在于， 所述控制单元还 用于在通知小区内的用户设备降低初始接入功率之前， 判断所述用户设备 的初始接入功率是否已被调整至预设的初始接入功率下限， 如果所述判断 的结果为否， 则所述控制单元通知小区内的用户设备降低初始接入功率。
PCT/CN2012/080563 2011-08-24 2012-08-24 随机接入方法和设备 WO2013026408A1 (zh)

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