WO2009092332A1 - 用户设备接入方法及系统 - Google Patents

用户设备接入方法及系统 Download PDF

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Publication number
WO2009092332A1
WO2009092332A1 PCT/CN2009/070209 CN2009070209W WO2009092332A1 WO 2009092332 A1 WO2009092332 A1 WO 2009092332A1 CN 2009070209 W CN2009070209 W CN 2009070209W WO 2009092332 A1 WO2009092332 A1 WO 2009092332A1
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Prior art keywords
frequency band
working frequency
user equipment
signal
broadcast signal
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PCT/CN2009/070209
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English (en)
French (fr)
Inventor
Yang Yu
Shaohui Sun
Dingcheng Yang
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Da Tang Mobile Communications Equipment Co., Ltd.
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Publication date
Application filed by Da Tang Mobile Communications Equipment Co., Ltd. filed Critical Da Tang Mobile Communications Equipment Co., Ltd.
Publication of WO2009092332A1 publication Critical patent/WO2009092332A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access

Definitions

  • the present invention relates to the field of broadband wireless communication technologies, and in particular, to a user equipment access method and system. Background of the invention
  • the user equipment In the access mode of the existing wireless communication system, the user equipment (UE, User Equipment) is required to have a signal receiving capability that matches the system bandwidth.
  • the maximum system bandwidth reaches 20 MHz.
  • the signal receiving capability of the UE is set to support a maximum system bandwidth of 20 MHz, and the system The Synchronization Channel (SCH) and the Broadcast Channel (BCH) are located in the central area of the system bandwidth.
  • FIG. 1 is a schematic diagram of a frequency domain structure of a SCH/BCH in a prior art LTE system. Both SCH and BCH are placed at the center of the cell system bandwidth with a basic bandwidth of 1.25 MHz.
  • the UE When the UE starts or loses network service, it needs to capture the system through the initial cell search. The UE needs to identify the cell it will camp on and demodulate the system information in the cell BCH. In this process, the UE scans the SCH, implements time-frequency synchronization through the SCH, and obtains the cell identifier. The UE receives the broadcast information of the system, and according to the time-frequency resource allocation information of the uplink and downlink random access channel indicated by the system broadcast information, the UE initiates an initial Random access process. After the uplink synchronization is completed, the UE and the base station will continue to exchange high-level signaling to complete the UE's resident operation in the cell.
  • the UE signal receiving capability defined in LTE is 20 MHz of the maximum system bandwidth of the system, so there is no need to jump on the system bandwidth to receive signals.
  • the base station may instruct the UE to receive and process signals of a specified frequency band according to the signal processing capability of the UE and the allocation of system resources.
  • the user can conveniently perform broadcast information, cell measurement, and cell reselection on the central frequency band of the monitoring system.
  • Broadband wireless communication will become the main development direction of mobile communication in the future.
  • the maximum wireless communication bandwidth can reach 100MHz.
  • the increase of the bandwidth of the wireless communication system may result in multiple choices of bandwidth resource allocation.
  • the system bandwidths that different operators may allocate are different, and the signal receiving capabilities of the UE are also different. Therefore, for the next generation broadband wireless communication system.
  • the current wireless access mode it is obviously unrealistic to require the UE to have a signal receiving capability that matches the system bandwidth. It can be seen that the existing wireless access mode cannot adapt to user access under a large bandwidth system.
  • the embodiment of the invention provides a user equipment access method, which can adapt to wireless access under a large system bandwidth.
  • the embodiment of the invention further provides a user equipment access system, a user equipment and a base station, which can adapt to wireless access under a large system bandwidth.
  • a user equipment access method includes:
  • PBCH Primary Broad channel
  • the user equipment receives the downlink synchronization signal and the primary broadcast signal to perform system access.
  • a user equipment access system includes:
  • a base station configured to divide a system frequency band into one or more operating frequency bands, each working The intermediate position of the frequency band is set to SCH and PBCH; the downlink synchronization signal is transmitted on the SCH of each working frequency band, and the primary broadcast signal is transmitted on the PBCH of each working frequency band, the primary broadcast signal including information required for the user equipment to access the system ;
  • the user equipment is configured to receive a downlink synchronization signal and a primary broadcast signal sent by the base station, and perform system access.
  • a user equipment including:
  • the initial random access initiating unit is configured to receive a downlink synchronization signal and a primary broadcast signal sent by the base station, select a cell whose capability matches the service, initiate initial random access at the initial access frequency, and report its own signal receiving capability to the base station.
  • Signal processing capability
  • a jump execution unit configured to receive a jump indication sent by the base station, perform a working frequency band jump according to the indication, and adjust a carrier frequency frequency point of the receiver.
  • a base station comprising:
  • a working frequency division module configured to divide a system frequency band into one or more working frequency bands, and set an SCH and a PBCH in an intermediate position of each working frequency band;
  • a downlink synchronization signal sending module configured to send a downlink synchronization signal in a SCH of each working frequency band set by the working frequency band dividing module
  • a main broadcast signal sending module configured to send a main broadcast signal in a PBCH of each working frequency band set by the working frequency band dividing module.
  • the user equipment access method, the system user equipment, and the base station divide the broadband frequency band into one or more working frequency bands, and set the SCH/BCH at the center position of each working frequency band. All users perform initial downlink synchronization from a certain SCH/BCH of the cell and initiate initial random access, and then jump to the working frequency band according to the system information indication of the cell, so that the UE signal receiving capability and system bandwidth are well solved.
  • the problem of mismatch makes the cell compatible with UEs of different capabilities. After the UE enters the working frequency band, it receives SCH and BCH in the working frequency band, and does not have to jump to a specific frequency point to read broadcast frequently. This way It can adapt to wireless access under large system bandwidth.
  • FIG. 1 is a schematic diagram of a frequency domain structure of a SCH/BCH in a prior art LTE system
  • FIG. 2 is a schematic diagram of a system band division and a SCH/BCH location according to an embodiment of the present invention. Mode for carrying out the invention
  • Embodiments of the present invention provide a user equipment access method for a broadband wireless communication system, which divides a system frequency band into one or more working frequency bands, and sets an SCH, a primary broadcast channel (PBCH), and a public broadcast in an intermediate position of each working frequency band.
  • a public broadcast signal is transmitted on a common broadcast channel.
  • the manner of dividing the system frequency band may be: dividing the system frequency band into one or more working frequency bands according to the signal receiving capability of the lowest level user equipment defined by the system, and the bandwidth of each working frequency band may be equal to the lowest level user equipment. The bandwidth that can be received.
  • the signal receiving capabilities of the user equipment defined in the system are: 5MHz, 10MHz, 15MHz, 20MHz and 40MHz, respectively, the system frequency band can be divided into multiple jobs according to the signal receiving capability of the lowest level user equipment, ie 5MHz. Band, the bandwidth of each operating band is 5MHz.
  • the SCH and BCH are set in the middle of each working band.
  • FIG. 2 is a schematic diagram of a system band division and a location of a SCH/BCH according to an embodiment of the present invention.
  • the system band is 60MHz
  • the signal receiving capability of the lowest level user equipment in the system is 5MHz.
  • the system band is divided into 12 operating bands with a bandwidth of 5MHz.
  • the SCH and BCH are set in the middle of each working band. .
  • the downlink synchronization signal is sent on the SCH for downlink time-frequency synchronization, cell identification, frame timing, and frequency point identification.
  • the downlink synchronization signals transmitted on the SCH of each working band may be the same or different.
  • the SCH should have good autocorrelation, cross-correlation, anti-frequency offset, anti-noise capability, and facilitate the structure of the receiver.
  • the primary broadcast signal is transmitted on the PBCH, and the primary broadcast signal includes information required by the user equipment to access the system, including: system bandwidth information, random access information, and related information in the working frequency band.
  • the public broadcast signal is transmitted on the common broadcast channel, and the public broadcast signal includes other system information, such as neighbor cell information, cell reselection information, and cell measurement information. Since the public broadcast signal contains a large amount of information, it can be further optimized to: divide the public broadcast signal into one or more information blocks, and distribute them in the frequency domain, and transmit the order of each information block in each connected frame. Shift. The specific way is:
  • the public broadcast signal is divided into one or more information blocks; the public broadcast signal includes system information other than the main broadcast signal, such as: cell selection information, reselection information, and measurement control information.
  • mapping each information block on a common broadcast channel of a working frequency band the working frequency bands of each information block mapping are different; transmitting corresponding information blocks on a common broadcast channel of each working frequency band; in each frame of the transmitted information block
  • the mapping order of the information blocks is cyclically shifted on the common broadcast channel of each working band with respect to the mapping order of the information blocks in the previous frame.
  • the public broadcast signal is divided into 12 information blocks, each of which is numbered from 0 to 11.
  • the information block 0 to the information block 11 are respectively mapped to the common broadcast channels of the 0th to 11th working bands, and the corresponding information blocks are transmitted on the common broadcast channel of each working band;
  • the information block The mapping order is shifted back by 1 bit on the common broadcast channel of each working band, that is, the information block 1 is mapped to the common broadcast channel of the 0th working band, and the information block 2 is mapped to the common broadcast channel of the 1st working band.
  • the block 11 is mapped to the common broadcast channel of the 10th working band, and the information block 0 is mapped to the common broadcast channel of the 11th working band; when the frame is t3, the mapping order of the information block is performed on the common broadcast channel of each working band. Move back 1 bit, and so on.
  • the UE may receive the information block on the common broadcast channel of the working frequency band in which it is located to acquire the public broadcast signal.
  • the complete public broadcast signal can be quickly received within one frame, and sufficient frequency domain diversity gain is obtained, and the receiving performance is good; for the UE with the lowest signal receiving capability, it can be in one
  • the public broadcast signal is received intact during the broadcast cycle as if it were operating in a relatively narrowband system.
  • the number of information blocks is equal to the number of operating frequency bands in the system, and this embodiment is only a preferred implementation. In other embodiments of the present invention, the number of information blocks may not be equal to the number of operating frequency bands, and the data blocks are divided according to actual conditions.
  • the mapping relationship can be:
  • the information block 0 to the information block 11 are sequentially mapped to the 0th to the 11th work, respectively.
  • mapping relationship can be: mapping the public broadcast signals to the 0th to the 11th respectively.
  • a common broadcast channel of the working frequency band, and a complete public broadcast signal is transmitted on the common broadcast channel of each working frequency band.
  • the UE After the UE is powered on, the UE scans the SCH on the spectrum of the corresponding operator according to the operator record in the SIM card, and performs initial downlink synchronization signal acquisition, if the downlink synchronization signal is successfully detected. Then go to the next step to read the broadcast; if it is not successful, scan each possible SCH one by one until the detection decision is successful.
  • the UE performs RSRP detection to satisfy the S criterion.
  • the UE acquires system broadcast information from the primary broadcast signal of the PBCH, and learns system bandwidth, support services, initial access resource information, and the like. The UE selects the appropriate cell to match the capability and service to prepare for access.
  • the UE directly selects the current frequency band. If the initial access frequency is not at the center of the system bandwidth, the UE performs carrier frequency offset adjustment according to the indication of the primary broadcast signal. Then, the UE performs downlink synchronization correction, receives the primary broadcast signal, initiates an initial random access procedure according to the initial access resource indicated by the system, and performs a cell registration operation.
  • the UE initiates initial random access on the initial access frequency point, and reports its own signal receiving capability and signal processing capability to the base station; the base station allocates uplink access according to the signal receiving capability and signal processing capability of the UE and the load condition of each working frequency band.
  • the channel resource indicates that the UE jumps to a suitable working frequency band; the UE performs a working frequency band jump according to the indication, and adjusts a carrier frequency frequency point of the receiver.
  • the initial random access of the UE in the working frequency band is completed at the initial access frequency.
  • the UE After receiving the indication from the base station, the UE jumps to the working frequency band, and does not need to perform initial random access again in the working frequency band, according to the indication of the system.
  • a signaling connection is reliably established for high-level signaling interaction.
  • the specific process of initiating random access at this time may be: The UE receives the SCH in the working frequency band.
  • the downlink synchronization signal is sent to perform synchronization correction; the UE receives the primary broadcast signal sent on the PBCH of the working frequency band, acquires uplink access channel resource information of the working frequency band, initiates random access, and performs cell registration operation.
  • the random access may be a non-contentious random access.
  • the base station can allocate the uplink access channel resources according to the number of UEs and the access success rate in each working frequency band, so that the random access has a sufficient probability of success, and the UE initiates a random access procedure in the access channel resources allocated by the base station.
  • the cell reselection needs to be performed.
  • the measurement range of cell reselection may have certain restrictions. The following details: For co-frequency reselection, all neighboring cells in the same working frequency band may be considered, regardless of different working bands of neighboring cells, because the cell The reason for the reselection is that the UE is far away from the original serving cell, and the signal strength in the frequency selective channel of each frequency point of the original cell is different. If searching for each working frequency band in the adjacent cell, it may be better in the short term. Signal, but from the long-term statistics, the average signal power of each working frequency band is consistent, so the measurement work of different working frequency bands of adjacent cells is meaningless and wastes time.
  • one operating band of all neighboring cells outside the system band of the own cell may be considered, regardless of the multiple operating bands of the neighboring cell, for the above reasons.
  • the user equipment reads the system broadcast information from the neighboring cell, and learns the system bandwidth, the support service, the initial access resource information, and the like.
  • the UE records all the possible cell information, and selects the cell that best matches its own capability and service to prepare for access.
  • the specific cell reselection mode may be: the UE obtains the signal strength of all the neighboring cells except the system band of the local cell, and selects the cell with the matching function and the service to perform the inter-frequency reselection in the cell with the appropriate signal strength; or, the user equipment Obtaining the signal strength of one working band of all neighboring cells except the system band of the own cell, and selecting the capability in a cell with suitable signal strength Inter-frequency reselection is performed on the cell that matches the service.
  • An embodiment of the present invention further provides a user equipment access system, including:
  • a base station configured to divide a system frequency band into one or more working frequency bands, where an SCH and a PBCH are set at an intermediate position of each working frequency band; a downlink synchronization signal is sent on an SCH of each working frequency band, and is sent on a PBCH of each working frequency band a primary broadcast signal, the primary broadcast signal including information required by the user equipment to access the system;
  • the user equipment is configured to receive a downlink synchronization signal and a primary broadcast signal sent by the base station, and perform system access.
  • the base station can divide the system frequency band according to the signal receiving capability of the lowest level user equipment defined by the system.
  • the base station may further be configured to: divide the public broadcast signal into one or more information blocks; the public broadcast signal includes system information other than the main broadcast signal; and set a public broadcast in an intermediate position of each working frequency band a channel, each information block is mapped on a common broadcast channel of a different working frequency band, and a corresponding information block is transmitted on a common broadcast channel of each working frequency band; in each frame of the transmitted information block, the mapping order of the information blocks is relatively The mapping order of the information blocks in the previous frame is cyclically shifted on the common broadcast channel of each working frequency band;
  • the user equipment may be further configured to: receive an information block sent by the base station on a public broadcast channel of a working frequency band in which it is located, and obtain a public broadcast signal.
  • the embodiment of the invention further provides a user equipment, which may include:
  • the initial random access initiating unit is configured to receive a downlink synchronization signal and a primary broadcast signal sent by the base station, select a cell whose capability matches the service, initiate initial random access at the initial access frequency, and report its own signal receiving capability to the base station.
  • Signal processing capability
  • a jump execution unit configured to receive a jump indication sent by the base station, perform a working frequency band jump according to the indication, and adjust a carrier frequency frequency point of the receiver.
  • the foregoing user equipment may further include:
  • the random access initiating unit is configured to receive a downlink synchronization signal sent on the SCH of the working frequency band where the user equipment is located, perform synchronization correction, and receive a primary broadcast signal sent on the PBCH of the working frequency band where the user equipment is located, and obtain an uplink connection of the working frequency band. Incoming channel resource information, initiating random access.
  • the public broadcast signal acquiring module is configured to receive the information block sent by the base station on the public broadcast channel of the working frequency band where the user equipment is located, and obtain the public broadcast signal.
  • the same-frequency reselection unit is configured to acquire signal strengths of all neighboring cells in the same working frequency band, and select a cell with the matching capability and the service matching cell in the cell with the appropriate signal strength to perform the same-frequency reselection.
  • the inter-frequency reselection unit is configured to obtain signal strength of an operating band of all neighboring cells except the system band of the local cell, and select a cell with matching capability and service to perform inter-frequency reselection in a cell with suitable signal strength.
  • the embodiment of the invention further provides a base station, which may include:
  • a working frequency division module configured to divide a system frequency band into one or more working frequency bands, and set an SCH and a PBCH in an intermediate position of each working frequency band;
  • a downlink synchronization signal sending module configured to send a downlink synchronization signal in a SCH of each working frequency band set by the working frequency band dividing module
  • a main broadcast signal sending module configured to send a main broadcast signal in a PBCH of each working frequency band set by the working frequency band dividing module.
  • the foregoing base station may further include:
  • a public broadcast signal dividing module configured to divide the public broadcast signal into one or more information blocks
  • An information block sending module configured to set a common broadcast channel in an intermediate position of each working frequency band, and map each information block on a common broadcast channel of an operating frequency band, each information block
  • the working frequency bands of the shots are different; the corresponding information blocks are transmitted on the common broadcast channel of each working frequency band; in each frame of the transmitted information block, the mapping order of the information blocks is relative to the mapping order of the information blocks in the previous frame.
  • the cyclic shift is performed on the common broadcast channel of the working band.
  • the embodiments of the present invention provide an access method, system user equipment, and base station for a future large-bandwidth wireless communication system, and divide the system frequency band into one or more working frequency bands to be compatible with various signal receiving capabilities. If the UE does not match the system bandwidth, the operating band jumps according to the indication of the base station; the system sets the SCH and the BCH in each working frequency band, so that the UE can receive the working frequency band after receiving a working frequency band.
  • the SCH and BCH without having to jump frequently to a specific frequency point to read the broadcast.
  • the embodiment of the present invention improves the transmission mode of the public broadcast signal, so that the UE can obtain the frequency domain diversity gain when receiving the public broadcast signal.
  • the embodiment of the present invention also limits the range of cell reselection, and can accelerate the cell. Re-election process.

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Description

用户设备接入方法及系统
技术领域
本发明涉及宽带无线通信技术领域， 特别涉及用户设备接入方法及 系统。 发明背景
现有的无线通信系统的接入模式中， 需要用户设备（UE , User Equipment )具有与系统带宽相匹配的信号接收能力。 例如， 在现有的长 期演进（ LTE, Long Term Evolution )无线通信标准中， 最大系统带宽达 到 20MHz, 为了避免系统设计的困难， 将 UE的信号接收能力设定为支 持最大系统带宽 20MHz, 而系统的同步信道（SCH, Synchronization Channel )和广播信道 ( BCH, Broadcasting Channel )位于系统带宽的中 心区域。 参见图 1 , 图 1为现有技术 LTE系统中 SCH/BCH的频域结构 示意图。 SCH和 BCH均被置于小区系统带宽的中心， 基本带宽为 1.25 MHz。
UE在开机或失去网络服务时， 需要通过小区初始搜索来捕获系统， UE 需要识别出其将要驻留的小区并且解调出该小区 BCH 中的系统信 息。 在这个过程中， UE扫描 SCH, 通过 SCH实现时频同步， 获取小区 标识； UE接收系统的广播信息， 并根据系统广播信息指示的上下行随 机接入信道的时频资源分配信息， UE发起初始随机接入过程。 完成上 行同步后， UE和基站将继续交互高层信令，完成 UE在小区的驻留操作。
LTE中定义的 UE信号接收能力为系统最大系统带宽 20MHz, 因此 不需要在系统带宽上跳转来接收信号。 基站可以根据 UE的信号处理能 力和系统资源的分配情况， 指示 UE接收和处理某一指定频带的信号。 用户能够很方便地进行监听系统中心频带上的广播信息、 小区测量及小 区重选等。
宽带无线通信将成为今后移动通信的主要发展方向， 例如， 在 ITU 的 IMT-Advanced系统中，最大无线通信的带宽可以达到 100MHz。未来 无线通信系统带宽的增大， 使得带宽资源分配可能出现多种选择， 不同 的运营商可能分配的系统带宽是不同的， 同时 UE的信号接收能力也有 差别， 因此， 对于下一代宽带无线通信系统来说， 沿用现有的无线接入 模式，要求 UE具有与系统带宽相匹配的信号接收能力显然是不现实的。 可见， 现有的无线接入模式无法适应大带宽系统下的用户接入。 发明内容
本发明实施例提出一种用户设备接入方法， 该方法能够适应大系统 带宽下的无线接入。
本发明实施例还提出一种用户设备接入系统、 用户设备和基站， 能 够适应大系统带宽下的无线接入。
本发明实施例的技术方案是这样实现的：
一种用户设备接入方法， 包括：
将系统频带划分为一个或一个以上工作频带， 每个工作频带的中间 位置设置 SCH和主广播信道（ PBCH, Primary BCH );
在每个工作频带的 SCH 上发送下行同步信号， 在每个工作频带的 PBCH上发送主广播信号， 所述主广播信号包括用户设备接入系统所需 的信息；
用户设备接收所述下行同步信号和主广播信号， 进行系统接入。 一种用户设备接入系统， 包括：
基站， 用于将系统频带划分为一个或一个以上工作频带， 每个工作 频带的中间位置设置 SCH和 PBCH; 在每个工作频带的 SCH上发送下 行同步信号， 在每个工作频带的 PBCH上发送主广播信号， 所述主广播 信号包括用户设备接入系统所需的信息；
用户设备， 用于接收基站发送的下行同步信号和主广播信号， 进行 系统接入。
一种用户设备， 包括：
初始随机接入发起单元， 用于接收基站发送的下行同步信号和主广 播信号， 选择能力和业务匹配的小区， 在初始接入频点发起初始随机接 入， 向基站上报自身的信号接收能力和信号处理能力；
跳转执行单元， 用于接收基站发送的跳转指示， 根据所述指示进行 工作频带跳转， 并调整接收机的载频频点。
一种基站， 包括：
工作频带划分模块， 用于将系统频带划分为一个或一个以上工作频 带， 每个工作频带的中间位置设置 SCH和 PBCH;
下行同步信号发送模块， 用于在工作频带划分模块所设置的每个工 作频带的 SCH发送下行同步信号；
主广播信号发送模块， 用于在工作频带划分模块所设置的每个工作 频带的 PBCH发送主广播信号。
可见， 本发明实施例提出的用户设备接入方法、 系统用户设备和基 站， 将宽带频带划分为一个或一个以上工作频带， 每个工作频带的中心 位置设置 SCH/BCH。所有用户都从小区的某一 SCH/BCH进行初始的下 行同步并发起初始随机接入， 然后根据小区的系统信息指示跳转到工作 频带，这样就很好的解决了 UE信号接收能力和系统带宽不匹配的问题， 使得小区能很好的兼容不同能力的 UE; UE进入工作频带之后， 接收本 工作频带内的 SCH和 BCH, 不必频繁跳转到特定的频点读广播。 这样 就能够适应大系统带宽下的无线接入。 附图简要说明
图 1为现有技术 LTE系统中 SCH/BCH的频域结构示意图； 图 2为本发明实施例系统频带划分及 SCH/BCH的位置示意图。 实施本发明的方式
本发明实施例提出一种宽带无线通信系统用户设备接入方法， 该方 法将系统频带划分为一个或一个以上工作频带， 每个工作频带的中间位 置设置 SCH、 主广播信道（PBCH )和公共广播信道， 其中 PBCH和公 共广播信道可以统称为 BCH; 在 SCH上发送下行同步信号， 在 PBCH 上发送主广播信号， 所述主广播信号包括用户设备接入系统所需的信 息； 用户设备接收所述下行同步信号和主广播信号， 进行系统接入。 在 公共广播信道上发送公共广播信号。
上述划分系统频带的方式可以为： 根据系统定义的最低等级的用户 设备的信号接收能力， 将系统频带划分为一个或一个以上的工作频带， 每个工作频带的带宽可以等于最低等级的用户设备所能够接收的带宽。
例如， 系统中定义的用户设备的信号接收能力分别有： 5MHz、 10MHz、 15 MHz, 20MHz和 40MHz, 则可以根据最低等级的用户设备 的信号接收能力， 即 5MHz, 将系统频带划分为多个工作频带， 每个工 作频带的带宽为 5MHz。 每个工作频带的中间位置设置 SCH和 BCH。 如图 2所示， 图 2为本发明实施例系统频带划分及 SCH/BCH的位置示 意图。 在图 2中， 系统频带为 60MHz, 系统中最低等级的用户设备的信 号接收能力为 5MHz,则将系统频带划分为 12个带宽为 5MHz的工作频 带， 每个工作频带的中间位置设置 SCH和 BCH。 其中，在 SCH上发送下行同步信号，用于下行时频同步、小区识别、 帧定时和频点标识。每个工作频带的 SCH上发送的下行同步信号可以是 相同的、 也可以是不同的。 SCH应具有很好的自相关、 互相关性和抗频 偏、 抗噪声能力， 便于筒化接收机的结构。
在 PBCH上发送主广播信号， 主广播信号中包含用户设备接入系统 所需的信息， 包括： 系统带宽信息、 随机接入信息和本工作频带内的相 关信息。
在公共广播信道上发送公共广播信号， 公共广播信号中包含了其他 的系统信息， 如邻小区信息、 小区重选信息和小区测量信息。 由于公共 广播信号包含的信息量较大， 可以进一步优化为： 将公共广播信号分成 一个或多个信息块， 在频域上均勾分布， 在各相连的帧中每个信息块的 发射次序循环移位。 具体方式为：
将公共广播信号划分为一个或一个以上信息块； 所述公共广播信号 包括除主广播信号外的系统信息， 如： 小区选择信息、 重选信息和测量 控制信息等。
将每个信息块映射在一个工作频带的公共广播信道上， 各信息块映 射的工作频带不同； 在每个工作频带的公共广播信道上发送对应的信息 块； 在发送信息块的每一帧中， 信息块的映射次序相对于上一帧中信息 块的映射次序在各个工作频带的公共广播信道上进行循环移位。
如图 2所示，将公共广播信号划分为 12个信息块，每个信息块编号 分别为 0至 11。 tl帧时， 将信息块 0至信息块 11分别映射到第 0至 11 个工作频带的公共广播信道， 在每个工作频带的公共广播信道上发送对 应的信息块； t2帧时， 信息块的映射次序在各个工作频带的公共广播信 道上向后移动 1位， 即： 将信息块 1映射到第 0个工作频带的公共广播 信道、 将信息块 2映射到第 1个工作频带的公共广播信道 将信 息块 11映射到第 10个工作频带的公共广播信道、 将信息块 0映射到第 11个工作频带的公共广播信道； t3帧时， 信息块的映射次序在各个工作 频带的公共广播信道上再向后移动 1位， 以此类推。
UE 可以在其所在的工作频带的公共广播信道上接收信息块， 获取 公共广播信号。 对于信号接收能力与系统带宽匹配的 UE, 可以在一帧 之内快速接收完整的公共广播信号， 并获得充分的频域分集增益， 接收 性能较好； 对于信号接收能力最低的 UE, 可以在一个广播周期内将公 共广播信号接收完整， 如同工作在一个相对窄带的系统中。
图 2所示的实施例中， 信息块的个数等于系统中工作频带的个数， 该实施例仅是一种较为理想的实施方式。 在本发明的其它实施例中， 信 息块的个数可以不等于工作频带的个数， 而依实际情况划分数据块。
例如： 系统中有 12个工作频带， 公共广播信号被划分为 15个信息 块， 则映射关系可以为： tl帧时， 分别将信息块 0至信息块 11依次映 射到第 0至第 11个工作频带的公共广播信道； t2帧时， 分别将信息块 12至信息块 14映射到第 0至第 2个工作频带的公共广播信道， 之后， 分别将信息块 1至信息块 9映射到第 3至第 11个工作频带的公共广播 信道； 在 t3帧时的映射关系以此类推， 不再赘述。
又如： 系统中有 12个工作频带，公共广播信号被划分为 1个信息块 (也就是不对公共广播信号进行划分）， 则映射关系可以为： 将公共广 播信号分别映射到第 0至第 11个工作频带的公共广播信道， 每个工作 频带的公共广播信道上均发送完整的公共广播信号。
将系统频带进行上述划分之后， UE进行系统接入的主要过程为：
1、 下行同步信号搜索：
UE在开机后， 根据 SIM卡中的运营商纪录， 扫描相应运营商频谱 上的 SCH, 进行初始的下行同步信号捕获， 如果下行同步信号检测成功 则进入下一步读广播； 如果不成功， 则逐一扫描各可能的 SCH, 直至检 测判决成功。
2、 小区选择：
UE进行 RSRP检测， 满足 S准则。
UE从 PBCH的主广播信号中获取系统广播信息， 得知系统带宽、 支持业务、 初始接入资源信息等。 UE选择能力和业务匹配的合适的小 区准备接入。
3、 UE工作频带选择、 接入和注册：
( 1 ) 对于信号接收能力与小区带宽匹配的 UE:
UE 直接选择当前频段。 如果初始接入频点不在系统带宽的中心位 置， 则 UE根据主广播信号的指示作载频偏移调整。 之后， UE进行下行 同步校正， 接收主广播信号， 根据系统指示的初始接入资源发起初始随 机接入过程， 进行小区注册操作。
( 2 ) 对于信号接收能力小于小区带宽匹配的 UE:
UE在初始接入频点上发起初始随机接入， 向基站上报自身的信号 接收能力和信号处理能力； 基站根据该 UE的信号接收能力和信号处理 能力以及各工作频带的负载情况分配上行接入信道资源， 指示该 UE跳 转至合适的工作频带； UE根据所述指示进行工作频带跳转， 并调整接 收机的载频频点。
工作频带跳转的 UE的初始随机接入是在初始接入频点上完成的， UE 收到基站指示之后跳转到工作频带， 在工作频带不必再次进行初始 随机接入， 根据系统的指示可以可靠地建立信令连接， 进行高层信令交 互。
UE工作在工作频带时， 如果需要发起业务， 也需要随机接入过程。 此时发起随机接入的具体过程可以为： UE接收所在工作频带的 SCH上 发送的下行同步信号， 进行同步校正； UE接收所在工作频带的 PBCH 上发送的主广播信号， 获取所述工作频带的上行接入信道资源信息， 发 起随机接入， 进行小区注册操作。 用户设备跳转之后， 当需要立即在新 的工作频段上建立高层信令连接时， 该随机接入可以是非竟争的随机接 入。 基站可以根据各个工作频带内的 UE的数量和接入成功率合理分配 上行接入信道资源， 令随机接入具有足够的成功概率， UE在基站分配 的接入信道资源中发起随机接入过程。
4、 小区重选
UE接入某小区之后， 当满足小区重选的触发准则时， 即需要进行 小区重选。 此时，对小区重选的测量范围可以有一定的限制， 以下详述： 对于同频重选， 可以考虑相同工作频带上的所有相邻小区， 不考虑 相邻小区的不同工作频带， 因为小区重选的原因在于 UE远离原来的服 务小区， 原小区各个频点的频率选择性信道中的信号强度是不同的， 如 果搜索相邻小区内的各个工作频带， 从短期看是可能得到更好的信号， 但从长期统计来看， 各个工作频带的平均信号功率是一致的， 因此相邻 小区不同工作频带的测量工作是没有意义的， 而且浪费时间。
对于异频重选， 可以考虑本小区系统频带之外的所有相邻小区的一 个工作频带， 不考虑相邻小区的多个工作频带， 理由如上。
用户设备从相邻小区读取系统广播信息，得知系统带宽、支持业务、 初始接入资源信息等。 UE纪录下所有可能接入的小区信息， 选择与自 身能力和业务最为匹配的小区准备接入。
具体小区重选的方式可以为： UE获取本小区系统频带之外的所有 相邻小区的信号强度， 在信号强度合适的小区中选择能力和业务匹配的 小区进行异频重选； 或者， 用户设备获取本小区系统频带之外的所有相 邻小区的一个工作频带的信号强度， 在信号强度合适的小区中选择能力 和业务匹配的小区进行异频重选。
本发明实施例还提出一种用户设备接入系统， 包括：
基站， 用于将系统频带划分为一个或一个以上工作频带， 每个工作 频带的中间位置设置 SCH和 PBCH; 在每个工作频带的 SCH上发送下 行同步信号， 在每个工作频带的 PBCH上发送主广播信号， 所述主广播 信号包括用户设备接入系统所需的信息；
用户设备， 用于接收基站发送的下行同步信号和主广播信号， 进行 系统接入。
基站可以根据系统定义的最低等级的用户设备的信号接收能力， 对 系统频带进行划分。
上述系统中， 基站还可以进一步用于： 将公共广播信号划分为一个 或一个以上信息块； 所述公共广播信号包括除主广播信号外的系统信 息； 在每个工作频带的中间位置设置公共广播信道， 将每个信息块映射 在不同工作频带的公共广播信道上， 在每个工作频带的公共广播信道上 发送对应的信息块； 在发送信息块的每一帧中， 信息块的映射次序相对 于上一帧中信息块的映射次序在各个工作频带的公共广播信道上进行 循环移位；
所述用户设备可以进一步用于： 在其所在的工作频带的公共广播信 道上接收基站发送的信息块， 获取公共广播信号。
本发明实施例还提出一种用户设备， 可以包括：
初始随机接入发起单元， 用于接收基站发送的下行同步信号和主广 播信号， 选择能力和业务匹配的小区， 在初始接入频点发起初始随机接 入， 向基站上报自身的信号接收能力和信号处理能力；
跳转执行单元， 用于接收基站发送的跳转指示， 根据所述指示进行 工作频带跳转， 并调整接收机的载频频点。 上述用户设备还可以进一步包括：
随机接入发起单元，用于接收用户设备所在工作频带的 SCH上发送 的下行同步信号， 进行同步校正； 接收用户设备所在工作频带的 PBCH 上发送的主广播信号， 获取所述工作频带的上行接入信道资源信息， 发 起随机接入。
公共广播信号获取模块， 用于在用户设备所在的工作频带的公共广 播信道上接收基站发送的信息块， 获取公共广播信号。
同频重选单元， 用于获取相同工作频带上的所有相邻小区的信号强 度， 在信号强度合适的小区中选择能力和业务匹配的小区进行同频重 选。
异频重选单元， 用于获取本小区系统频带之外的所有相邻小区的一 个工作频带的信号强度， 在信号强度合适的小区中选择能力和业务匹配 的小区进行异频重选。
本发明实施例还提出一种基站， 可以包括：
工作频带划分模块， 用于将系统频带划分为一个或一个以上工作频 带， 每个工作频带的中间位置设置 SCH和 PBCH;
下行同步信号发送模块， 用于在工作频带划分模块所设置的每个工 作频带的 SCH发送下行同步信号；
主广播信号发送模块， 用于在工作频带划分模块所设置的每个工作 频带的 PBCH发送主广播信号。
上述基站还可以进一步包括：
公共广播信号划分模块， 用于将公共广播信号划分为一个或一个以 上信息块；
信息块发送模块， 用于在每个工作频带的中间位置设置公共广播信 道， 将每个信息块映射在一个工作频带的公共广播信道上， 各信息块映 射的工作频带不同； 在每个工作频带的公共广播信道上发送对应的信息 块； 在发送信息块的每一帧中， 信息块的映射次序相对于上一帧中信息 块的映射次序在各个工作频带的公共广播信道上进行循环移位。
总之， 本发明实施例提出一种应对未来大带宽无线通信系统的接入 方法、 系统用户设备和基站， 将系统频带划分为一个或一个以上工作频 带， 用以兼容各种具有不同信号接收能力的用户设备； UE 与系统带宽 不匹配的情况下， 根据基站的指示进行工作频带跳转； 系统在各个工作 频带上均设置 SCH和 BCH, 使得 UE进行某一工作频带后， 可以接收 本工作频带内的 SCH和 BCH, 而不必频繁跳转到特定的频点读广播。 另外， 本发明实施例改进了公共广播信号的发送方式， 使 UE在接收公 共广播信号时可以得频域分集增益； 并且， 本发明实施例还对小区重选 的范围提出了限制， 可以加快小区重选进程。
以上所述仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡 在本发明的精神和原则之内， 所做的任何修改、 等同替换、 改进等， 均 应包含在本发明保护的范围之内。

Claims

权利要求书
1、 一种用户设备接入方法， 其特征在于， 所述方法包括： 将系统频带划分为一个或一个以上工作频带， 每个工作频带的中间 位置设置同步信道 SCH和主广播信道 PBCH;
在每个工作频带的 SCH 上发送下行同步信号， 在每个工作频带的 PBCH上发送主广播信号， 所述主广播信号包括用户设备接入系统所需 的信息；
用户设备接收所述下行同步信号和主广播信号。
2、根据权利要求 1所述的方法， 其特征在于， 所述方法下行同步信 号用于完成小区下行时频同步、 小区识别、 帧定时和频点标识。
3、根据权利要求 1所述的方法， 其特征在于， 所述每个工作频带的 SCH上发送的下行同步信号不同。
4、根据权利要求 1所述的方法，其特征在于，所述主广播信号包括： 系统带宽信息、 随机接入信息和本工作频带内的相关信息。
5、根据权利要求 1所述的方法，其特征在于，所述方法进一步包括： 将公共广播信号划分为一个或一个以上信息块； 所述公共广播信号 包括除主广播信号外的系统信息；
在每个工作频带的中间位置设置公共广播信道， 将每个信息块映射 在一个工作频带的公共广播信道上， 各信息块映射的工作频带不同； 在 每个工作频带的公共广播信道上发送对应的信息块； 在发送信息块的每 一帧中， 信息块的映射次序相对于上一帧中信息块的映射次序在各个工 作频带的公共广播信道上进行循环移位。
6、根据权利要求 5所述的方法，其特征在于，所述方法进一步包括： 用户设备在其所在的工作频带的公共广播信道上接收所述信息块， 获取公共广播信号。
7、根据权利要求 1至 6中任意一项所述的方法， 其特征在于， 所述 方法进一步包括：
用户设备接收所述下行同步信号和主广播信号， 选择能力和业务匹 配的小区， 在初始接入频点发起初始随机接入， 向基站上报自身的信号 接收能力和信号处理能力； 基站根据所述用户设备的信号接收能力和信 号处理能力以及各工作频带的负载情况， 指示用户设备跳转至合适的工 作频带；
用户设备根据所述指示进行工作频带跳转， 并调整接收机的载频频 点。
8、根据权利要求 7所述的方法，其特征在于，所述方法进一步包括： 基站根据各工作频带上的用户设备的数量和接入成功率， 分配上行接入 信道资源。
9、根据权利要求 7所述的方法，其特征在于，所述方法进一步包括： 用户设备接收所在工作频带的 SCH上发送的下行同步信号，进行同 步校正；
用户设备接收所在工作频带的 PBCH上发送的主广播信号， 获取所 述工作频带的上行接入信道资源信息， 发起随机接入。
10、 根据权利要求 9所述的方法， 其特征在于， 当用户设备需要立 即在跳转后所在的工作频段上建立高层信令连接时， 所述随机接入为非 竟争的随机接入。
11、 根据权利要求 1所述的方法， 其特征在于， 所述方法进一步包 括： 用户设备获取相同工作频带上的所有相邻小区的信号强度， 在信号 强度合适的小区中选择能力和业务匹配的小区进行同频重选。
12、 根据权利要求 1所述的方法， 其特征在于， 所述方法进一步包 括： 用户设备获取本小区系统频带之外的所有相邻小区的一个工作频带 的信号强度， 在信号强度合适的小区中选择能力和业务匹配的小区进行 异频重选。
13、 一种用户设备接入系统， 其特征在于， 所述系统包括： 基站， 用于将系统频带划分为一个或一个以上工作频带， 每个工作 频带的中间位置设置 SCH和 PBCH; 在每个工作频带的 SCH上发送下 行同步信号， 在每个工作频带的 PBCH上发送主广播信号， 所述主广播 信号包括用户设备接入系统所需的信息；
用户设备， 用于接收基站发送的下行同步信号和主广播信号。
14、根据权利要求 13所述的系统， 其特征在于， 所述基站进一步用 于： 将公共广播信号划分为一个或一个以上信息块； 所述公共广播信号 包括除主广播信号外的系统信息； 在每个工作频带的中间位置设置公共 广播信道， 将每个信息块映射在不同工作频带的公共广播信道上， 在每 个工作频带的公共广播信道上发送对应的信息块； 在发送信息块的每一 帧中， 信息块的映射次序相对于上一帧中信息块的映射次序在各个工作 频带的公共广播信道上进行循环移位；
所述用户设备进一步用于： 在其所在的工作频带的公共广播信道上 接收基站发送的信息块， 获取公共广播信号。
15、 一种用户设备， 其特征在于， 所述用户设备包括：
初始随机接入发起单元， 用于接收基站发送的下行同步信号和主广 播信号， 选择能力和业务匹配的小区， 在初始接入频点发起初始随机接 入， 向基站上报自身的信号接收能力和信号处理能力；
跳转执行单元， 用于接收基站发送的跳转指示， 根据所述指示进行 工作频带跳转， 并调整接收机的载频频点。
16、根据权利要求 15所述的用户设备， 其特征在于， 所述用户设备 还包括：
随机接入发起单元，用于接收用户设备所在工作频带的 SCH上发送 的下行同步信号， 进行同步校正； 接收用户设备所在工作频带的 PBCH 上发送的主广播信号， 获取所述工作频带的上行接入信道资源信息， 发 起随机接入。
17、根据权利要求 15所述的用户设备， 其特征在于， 所述用户设备 还包括：
公共广播信号获取模块， 用于在用户设备所在的工作频带的公共广 播信道上接收基站发送的信息块， 获取公共广播信号。
18、根据权利要求 15所述的用户设备， 其特征在于， 所述用户设备 还包括：
同频重选单元， 用于获取相同工作频带上的所有相邻小区的信号强 度， 在信号强度合适的小区中选择能力和业务匹配的小区进行同频重 选。
19、根据权利要求 15所述的用户设备， 其特征在于， 所述用户设备 还包括：
异频重选单元， 用于获取本小区系统频带之外的所有相邻小区的一 个工作频带的信号强度， 在信号强度合适的小区中选择能力和业务匹配 的小区进行异频重选。
20、 一种基站， 其特征在于， 所述基站包括：
工作频带划分模块， 用于将系统频带划分为一个或一个以上工作频 带， 每个工作频带的中间位置设置 SCH和 PBCH;
下行同步信号发送模块， 用于在工作频带划分模块所设置的每个工 作频带的 SCH发送下行同步信号；
主广播信号发送模块， 用于在工作频带划分模块所设置的每个工作 频带的 PBCH发送主广播信号。
21、 根据权利要求 20所述的基站， 其特征在于， 所述基站还包括： 公共广播信号划分模块， 用于将公共广播信号划分为一个或一个以 上信息块；
信息块发送模块， 用于在每个工作频带的中间位置设置公共广播信 道， 将每个信息块映射在一个工作频带的公共广播信道上， 各信息块映 射的工作频带不同； 在每个工作频带的公共广播信道上发送对应的信息 块； 在发送信息块的每一帧中， 信息块的映射次序相对于上一帧中信息 块的映射次序在各个工作频带的公共广播信道上进行循环移位。
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