本申请是分案申请，原案申请的申请号为200680055955.0，国际申请号为PCT/JP2006/319325，申请日为2006年9月28日，发明名称为“无线通信装置、基站以及它们的控制方法”。This application is a divisional application, the application number of the original application is 200680055955.0, the international application number is PCT/JP2006/319325, the filing date is September 28, 2006, and the title of the invention is "wireless communication device, base station and their control method" .
技术领域technical field
本发明涉及当移动终端与基站取得同步时发送随机接入信号的无线通信装置。The present invention relates to a wireless communication device that transmits a random access signal when a mobile terminal is synchronized with a base station.
背景技术Background technique
在目前进行基础研究的作为3GPP系统的下一代系统的EUTRAN（EvolvedUTRAN）中，随着移动终端的移动而发生的跨越不同基站分别覆盖的小区间的切换是硬切换。在硬切换中，在切断了移动终端与移动前正在通信的基站的线路连接之后，连接移动终端与移动目的基站的线路。硬切换能够在即将进行切换之前得到移动目的基站的系统信息，并在短时间内进行切换，但是在切换中会发生用户数据传送中断的状态。In the EUTRAN (Evolved UTRAN), which is the next-generation system of the 3GPP system, which is currently undergoing basic research, the handover between cells covered by different base stations that occurs as the mobile terminal moves is a hard handover. In hard handover, after the mobile terminal is disconnected from the line connection with the base station with which the mobile terminal was communicating before the move, the line between the mobile terminal and the moving destination base station is connected. In hard handover, the system information of the target base station can be obtained immediately before the handover, and the handover can be performed in a short time, but a state in which user data transmission is interrupted occurs during the handover.
此外，在EUTRAN中，作为数据帧的前导码部所使用的码，最有效的是使用CAZAC（Constant Amplitude Zero Auto Correlation，恒包络零自相关）序列，其包含在上行链路的无线区间进行发送的随机接入信号。作为CAZAC序列有Zadoff-Chu序列、GCL序列等。以下，示出表示作为一种CAZAC序列的Zadoff-Chu序列的式子：In addition, in EUTRAN, it is most effective to use the CAZAC (Constant Amplitude Zero Auto Correlation, constant envelope zero autocorrelation) sequence as the code used in the preamble part of the data frame, which is included in the wireless section of the uplink. Random access signal sent. As the CAZAC sequence, there are Zadoff-Chu sequence, GCL sequence and the like. The following shows a formula representing a Zadoff-Chu sequence as a CAZAC sequence:
在上述式中，L是序列长度，k是序列索引。特别是当长度L为素数长度时，该序列具有良好的自相关特性和互相关特性。In the above formula, L is the sequence length, and k is the sequence index. Especially when the length L is a prime number, the sequence has good auto-correlation and cross-correlation properties.
图1是根据CAZAC序列生成在EUTRAN的无线部上行链路中使用的随机接入信号的前导码部的电路的一例的框图。FIG. 1 is a block diagram of an example of a circuit for generating a preamble portion of a random access signal used in uplink of a radio portion of EUTRAN from a CAZAC sequence.
长度M(L)的CAZAC序列在进行串行/并行变换之后，被输入到DFT部10中，被傅立叶变换成并行数为M的并行信号。该信号被输入到子载波映射部11中而被映射在N个子载波上。将映射了CAZAC序列的子载波信号输入到IFFT部12中进行傅立叶反变换，并且输入到并行/串行变换部13中。并行数为N的IFFT部12的输出信号由并行/串行变换部13变换为串行信号，作为随机接入前导码序列输出。The CAZAC sequence of length M (L) is input to the DFT unit 10 after serial/parallel conversion, and is Fourier-transformed into a parallel signal whose number of parallels is M. This signal is input to the subcarrier mapping unit 11 and mapped onto N subcarriers. The subcarrier signal onto which the CAZAC sequence is mapped is input to the IFFT section 12 for inverse Fourier transform, and then input to the parallel/serial conversion section 13 . The output signal of the IFFT section 12 with the number of parallels N is converted into a serial signal by the parallel/serial conversion section 13, and output as a random access preamble sequence.
而且，假定在EUTRAN中系统带宽（基站在无线区间中发送、接收的传送带宽）最大为20MHz，目前终端发送接收的最小带宽为10MHz。终端具有对至少10MHz宽度的信号进行发送接收的能力。此外，还假定对系统带宽不同的基站所相邻的小区进行展开。为了使终端能与系统带宽无关地容易地进行初始小区搜索和切换，将在下行链路的无线区间中发送的同步信道以及报告信号信道（传送小区、基站的信息等的信道。以下，表示为报告信道）配置在下行链路的传送频带的中心处。但是，当系统传送带宽为20MHz时，还要考虑在传送频带内的2至3个位置放置同步信道的问题。这是将存在发送接收信号带宽是10MHz的移动终端考虑在内的问题。Moreover, it is assumed that the maximum system bandwidth (transmission bandwidth for base stations to transmit and receive in the wireless section) in EUTRAN is 20MHz, and the minimum bandwidth for terminal transmission and reception is currently 10MHz. The terminal has the ability to send and receive signals with a width of at least 10MHz. In addition, it is also assumed that cells adjacent to base stations with different system bandwidths are expanded. In order to allow the terminal to easily perform initial cell search and handover regardless of the system bandwidth, the synchronization channel and the report signal channel (channels that transmit information on cells and base stations, etc.) transmitted in the downlink radio section. Hereinafter, they are expressed as report channel) is configured at the center of the downlink transmission band. However, when the system transmission bandwidth is 20MHz, the problem of placing synchronization channels at 2 to 3 positions within the transmission frequency band should also be considered. This is a problem taking into account the presence of mobile terminals whose transmission and reception signal bandwidth is 10 MHz.
不管在哪种情况下，都不一定在全部子帧中插入同步信道来进行发送，假定按照每5、10或20子帧来插入同步信道进行发送。In any case, it is not necessary to insert and transmit synchronization channels in all subframes, and it is assumed that synchronization channels are inserted and transmitted every 5, 10 or 20 subframes.
在EUTRAN中，不同基站覆盖的相邻小区间的切换为硬切换，当某个移动终端在正在进行数据传送的过程中开始切换时，针对该终端处于发送状态的下行链路数据的发送被中断，从正在进行通信的基站被传送到切换目的基站。并且，在切换结束之前，在基站侧的缓冲器中需要存储针对该移动终端的下行链路数据，但是随着切换需要的时间变长，缓冲器中应积蓄的数据量也增加。同样地，当切换开始时，该移动终端应发送到基站侧的上行链路数据也中止发送，需要存储在移动终端侧的缓冲器中。在这种情况下，在切换过程中，有可能某个数据被丢弃了，在正常数据的情况下，需要上层再次进行发送。此外，在以HARQ（Hybrid Automatic Repeat reQuest，混合自动重传）为基础进行连续数据发送的状态下，当发生切换时，也可能会产生依次赋予给连续数据的序列号被更换的情况。在语音分组的语音通话中进行切换时，也会发生下行链路的语音分组被传送到切换目的基站而中断语音通话的情况。而且，由于是实时的语音通信，所以被传送的所有语音分组在传送目的地不一定被有效利用。In EUTRAN, the handover between adjacent cells covered by different base stations is a hard handover. When a mobile terminal starts handover during data transmission, the transmission of downlink data for this terminal is interrupted. , is transmitted from the communicating base station to the handover destination base station. Also, downlink data for the mobile terminal needs to be stored in a buffer on the base station side until handover is completed, but as time required for handover becomes longer, the amount of data to be stored in the buffer also increases. Similarly, when the handover starts, the uplink data that should be sent by the mobile terminal to the base station is also suspended, and needs to be stored in the buffer on the mobile terminal side. In this case, during the switching process, some data may be discarded, and in the case of normal data, the upper layer needs to send it again. In addition, in the state of continuous data transmission based on HARQ (Hybrid Automatic Repeat reQuest, Hybrid Automatic Repeat reQuest), when switching occurs, the sequence numbers assigned to the continuous data may be replaced in turn. When handover is performed during a voice call of voice packets, a downlink voice packet may be transmitted to the handover target base station and the voice call may be interrupted. Furthermore, since it is real-time voice communication, all transmitted voice packets are not necessarily effectively used at the transmission destination.
在以上情况下，不理想的是，数据的种类不管是通常的数据还是语音分组，切换所需要的时间都很长。In the above case, it is unfavorable that it takes a long time to switch the type of data regardless of whether it is normal data or voice packets.
在切换的过程中，终端需要捕捉从切换目的基站发送的下行链路同步信道，并且在取得同步之后，在上行链路中发送随机接入信号。在下行链路中取得同步之后，如果能够快速地发送随机接入信号，则有可能缩短切换所需要的时间。In the process of handover, the terminal needs to capture the downlink synchronization channel transmitted from the handover target base station, and after acquiring the synchronization, transmit the random access signal in the uplink. If the random access signal can be transmitted quickly after synchronization is acquired in the downlink, it is possible to shorten the time required for handover.
此外，当使用CAZAC序列作为随机接入信号的前导码部时，即使使用的CAZAC序列的长度L相同，由于序列的索引k不同，前导码部的PAPR（Peak-to-average powerratio，峰均功率比）值也不同。In addition, when the CAZAC sequence is used as the preamble part of the random access signal, even if the length L of the CAZAC sequence used is the same, since the index k of the sequence is different, the PAPR (Peak-to-average powerratio, peak-to-average power) of the preamble part ratio) are also different.
图2是示出使用了Zadoff-Chu序列的带宽5MHz的前导码信号的PAPR特性的图。FIG. 2 is a diagram showing PAPR characteristics of a preamble signal with a bandwidth of 5 MHz using Zadoff-Chu sequences.
图2中使用的Zadoff-Chu序列的序列长度是固定的，通过对序列的索引k进行各种变化来调查PAPR。可以得知，根据索引值会发生3dB以上的PAPR值的差异。即，越是PAPR大的序列，与平均功率相比，其峰值功率越大。The sequence length of the Zadoff-Chu sequence used in Fig. 2 was fixed, and the PAPR was investigated by making various changes to the index k of the sequence. It can be seen that a difference of 3 dB or more in the PAPR value occurs depending on the index value. That is, the sequence with larger PAPR has higher peak power than average power.
为了在移动终端发送前导码部时不使前导码部的信号波形发生变形，使用PAPR值越大的CAZAC序列作为前导码，则移动终端的发送部功率放大器需要的发送输出回退量越大。通常，当增大回退量使放大器进行动作时，放大器的消耗功率变大。即，对于输入功率，发送部功率放大器的输入功率小的位置具有线性放大特性，而该放大特性从放大器所决定的某输入功率值附近开始成为非线性特性，放大率饱和并且变小。当对使用PAPR大的CAZAC序列作为前导码的信号进行放大时，由于该信号的平均功率与峰值功率的差较大，所以当输入该信号的平均功率的位置是靠近放大器的放大特性的饱和区域的部分时，该信号的峰值功率由于放大特性饱和不进行线性放大，引起信号变形。因此，为了消除信号变形，使输入放大器的信号平均功率变低，当信号功率达到峰值时，必须使该功率不到达放大器的放大特性饱和的区域。在放大器的放大特性中，将输入功率或输出功率的平均功率所在的点称作动作点，将从动作点的输出饱和点开始的减少量称为回退量。In order not to deform the signal waveform of the preamble portion when the mobile terminal transmits the preamble portion, using a CAZAC sequence with a larger PAPR value as the preamble requires a larger transmission output backoff amount for the power amplifier of the transmission portion of the mobile terminal. Generally, when the backoff amount is increased to operate the amplifier, the power consumption of the amplifier increases. That is, with respect to input power, the transmission unit power amplifier has linear amplification characteristics where the input power is low, but the amplification characteristics become nonlinear characteristics near a certain input power value determined by the amplifier, and the amplification factor becomes saturated and becomes small. When amplifying a signal using a CAZAC sequence with a large PAPR as a preamble, since the difference between the average power and peak power of the signal is large, the position of the average power of the input signal is close to the saturation region of the amplification characteristic of the amplifier When part of the peak power of the signal is not linearly amplified due to the saturation of the amplification characteristic, the signal is deformed. Therefore, in order to eliminate signal distortion and reduce the average power of the signal input to the amplifier, when the signal power reaches a peak value, it is necessary to prevent the power from reaching the region where the amplification characteristics of the amplifier are saturated. In the amplification characteristics of the amplifier, the point where the average power of the input power or output power is called the operating point, and the amount of decrease from the output saturation point of the operating point is called the backoff amount.
在非专利文献中，记载有与EUTRAN相关的说明。此外，非专利文献2中记载有关于Zadoff-Chu序列等的CAZAC序列。In the non-patent literature, descriptions related to EUTRAN are described. In addition, Non-Patent Document 2 describes CAZAC sequences such as Zadoff-Chu sequences.
非专利文献1：3GPP TR25.814Non-Patent Document 1: 3GPP TR25.814
非专利文献2：3GPP TSG RAN1LTE Ad Hoc R1-061710Non-Patent Document 2: 3GPP TSG RAN1LTE Ad Hoc R1-061710
发明内容Contents of the invention
本发明的课题是提供一种在进行硬切换的移动通信系统中，尽量使切换时的数据瞬间切断的时间变短、并有效地实现硬切换的无线通信装置。It is an object of the present invention to provide a wireless communication device that efficiently realizes hard handover by minimizing the time for instantaneous data disconnection during handover in a mobile communication system that performs hard handover.
切换时，由于移动终端位于小区边缘附近，所以使基站接收部成功接收移动终端发送的前导码信号所需要的发送功率大于位于基站附近的移动终端发送相同前导码信号时的发送功率。而且，从小区半径大的小区的小区边缘附近发送随机接入信号的前导码部所需要的发送功率有可能大于该移动终端的最大可能发送功率。During handover, since the mobile terminal is located near the edge of the cell, the transmission power required for the base station receiver to successfully receive the preamble signal sent by the mobile terminal is greater than the transmission power when the mobile terminal located near the base station transmits the same preamble signal. Furthermore, the transmission power required to transmit the preamble portion of the random access signal from the vicinity of the cell edge of a cell with a large cell radius may be greater than the maximum possible transmission power of the mobile terminal.
此外，在切换的过程中，终端需要捕捉从切换目的基站发送的下行链路同步信道，取得同步之后，在上行链路中发送随机接入信号。如果在下行链路中取得了同步之后能够迅速地发送随机接入信号的话，则有可能缩短切换所需要的时间。在此，本发明中采用了一种无线通信装置，其将上行链路和下行链路的频带分割成更窄的频带并分配数据，以无线的方式进行通信，其特征在于，该无线通信装置具有：同步信号捕捉单元，当接受到应切换的通知时，该同步信号捕捉单元捕捉切换目的基站发送的同步信号；同步确立信号发送单元，其从捕捉到该同步信号的定时开始经过规定时间后，使用上行链路频带内的频率位置，将用于确立与该切换目的基站同步的同步确立信号向该切换目的基站发送。In addition, during the handover process, the terminal needs to capture the downlink synchronization channel transmitted from the handover destination base station, and after obtaining synchronization, transmit the random access signal in the uplink. It is possible to shorten the time required for handover if a random access signal can be transmitted quickly after synchronization is achieved in the downlink. Here, the present invention employs a wireless communication device that divides uplink and downlink frequency bands into narrower frequency bands and distributes data to communicate wirelessly. The wireless communication device is characterized in that It has: a synchronous signal capturing unit that captures a synchronous signal transmitted from a handover target base station when receiving a notification that handover is to be performed; and a synchronization establishment signal transmitting unit that passes a predetermined time from the timing at which the synchronous signal is captured. , using a frequency position within the uplink frequency band, to transmit a synchronization establishment signal for establishing synchronization with the handover destination base station to the handover destination base station.
优选下行链路频带中发送同步信号的频率位置的关系与上行链路频带中发送同步确立信号的频率位置的关系一样。例如，当下行链路频带中发送同步信号的频率位置对应于中心频率位置时，在上行链路频带的中心频率位置发送同步确立信号。而且，由于是从偏离无线基站的位置发送的信号（例如，随机接入信号的前导码），因此抑制了发送输出的回退量的增大。Preferably, the relationship between frequency positions for transmitting synchronization signals in the downlink frequency band is the same as that for frequency positions for transmitting synchronization establishment signals in the uplink frequency band. For example, when the frequency position at which the synchronization signal is transmitted in the downlink frequency band corresponds to the center frequency position, the synchronization establishment signal is transmitted at the center frequency position of the uplink frequency band. Furthermore, since the signal (for example, the preamble of the random access signal) is transmitted from a position deviated from the radio base station, an increase in the back-off amount of the transmission output is suppressed.
在此，本发明中采用了一种移动站，该移动站接收切换目的无线基站发送的同步信道，然后经由随机接入信道发送随机接入信号，由此确立上行无线线路，其特征在于，该移动站具有前导码生成部，该前导码生成部将索引不同的多个CAZAC序列中用作所述随机接入信号的前导码的CAZAC序列限制为规定的CAZAC序列，并利用该限制的CAZAC序列生成所述随机接入信号的前导码。Here, the present invention employs a mobile station that receives a synchronization channel transmitted from a handover target wireless base station, and then transmits a random access signal via a random access channel to thereby establish an uplink wireless link, characterized in that the The mobile station has a preamble generation unit that restricts a CAZAC sequence used as a preamble of the random access signal among a plurality of CAZAC sequences with different indexes to a predetermined CAZAC sequence, and uses the restricted CAZAC sequence A preamble of the random access signal is generated.
附图说明Description of drawings
图1是根据CAZAC序列生成在EUTRAN的无线部上行链路中使用的随机接入信号的前导码部的电路的一例的框图。FIG. 1 is a block diagram of an example of a circuit for generating a preamble portion of a random access signal used in uplink of a radio portion of EUTRAN from a CAZAC sequence.
图2是示出使用Zadoff-Chu序列的带宽5MHz的前导码信号的PAPR特性的图。FIG. 2 is a diagram showing PAPR characteristics of a preamble signal with a bandwidth of 5 MHz using a Zadoff-Chu sequence.
图3是说明本发明实施方式的第1原理的图。FIG. 3 is a diagram illustrating a first principle of the embodiment of the present invention.
图4是说明本发明实施方式的第2原理的图。FIG. 4 is a diagram illustrating a second principle of the embodiment of the present invention.
图5是示出根据本发明实施方式进行切换时的顺序的图（其1）。FIG. 5 is a diagram (No. 1 ) showing a procedure at the time of handover according to the embodiment of the present invention.
图6是示出根据本发明实施方式进行切换时的顺序的图（其2）。FIG. 6 is a diagram (part 2 ) showing a procedure at the time of handover according to the embodiment of the present invention.
图7是示出根据本发明实施方式进行切换时的顺序的图（其3）。FIG. 7 is a diagram (part 3 ) showing a procedure when handover is performed according to the embodiment of the present invention.
图8是基于本发明实施方式的移动终端的方框结构图。FIG. 8 is a block diagram of a mobile terminal based on an embodiment of the present invention.
图9是基于本发明实施方式的切换时的移动源基站的方框结构图。FIG. 9 is a block configuration diagram of a moving source base station during handover according to an embodiment of the present invention.
图10是基于本发明实施方式的切换时的移动目的基站的方框结构图。FIG. 10 is a block configuration diagram of a destination base station at the time of handover according to the embodiment of the present invention.
具体实施方式Detailed ways
在本发明的实施方式中，采用如下的手段。In an embodiment of the present invention, the following means are employed.
1．将切换时可以针对移动目的小区的基站（切换目的基站）发送非同步型随机接入信号的定时和频率设为：在与移动目的小区的下行链路的无线区间发送同步信道的子波段（在将无线通信中使用的全部无线传送频带分成几个频带时被分割的频域中的发送同步信道的频域）相对应的移动目的小区的上行链路的无线区间的子波段上，并且从移动目的小区的下行链路同步信道的位置偏移规定时间的定时（与该定时相对应的子帧内）。但是，有时非同步型随机接入信号的前导码部的长度由于小区的大小而不同。例如，有时在大的小区中非同步型随机接入信号的前导码部跨过多个连续子帧，而将非同步型随机接入信号的发送开始定时设为从同步信道的位置偏移相同的规定时间的定时。1. The timing and frequency at which an asynchronous random access signal can be transmitted to the base station of the mobile target cell (handover target base station) at the time of handover is set to transmit the sub-band of the synchronization channel (in the downlink radio section with the mobile target cell) When the entire wireless transmission frequency band used in wireless communication is divided into several frequency bands, the frequency domain of the transmission synchronization channel in the divided frequency domain) corresponds to the sub-band of the uplink wireless section of the mobile destination cell, and from the mobile The position of the downlink synchronization channel of the target cell is shifted by a predetermined time timing (within a subframe corresponding to the timing). However, the length of the preamble portion of the asynchronous random access signal may vary depending on the size of the cell. For example, in a large cell, the preamble part of the asynchronous random access signal may span a plurality of consecutive subframes, and the timing of starting transmission of the asynchronous random access signal is set to be the same as the position offset from the synchronization channel. timing of the specified time.
另外，切换时，从移动源基站向进行切换的移动终端通知与移动目的小区中使用的非同步型随机接入信号的前导码部的长度相关的信息。In addition, at the time of handover, the mobile terminal performing handover is notified from the source base station of information on the length of the preamble portion of the asynchronous random access signal used in the target cell.
此外，时间偏移量唯一确定，在一个移动通信系统的全部小区中共用。此时，时间偏移量既可以由移动终端预先存储在存储部中，也可以由切换源或目的无线基站指定。像这样，如果时间偏移量恒定，则即使基站在一定时间内不跨过整个通信频带查找来自各移动终端的随机接入信号也可以，因此能快速地确立基站和移动站的线路。In addition, the time offset is uniquely determined and shared by all cells in one mobile communication system. In this case, the time offset may be stored in the storage unit in advance by the mobile terminal, or specified by the handover source or destination radio base station. As long as the time offset is constant in this way, the base station does not need to search for random access signals from mobile terminals across the entire communication frequency band within a certain period of time. Therefore, it is possible to quickly establish a link between the base station and the mobile station.
此外，对于移动终端来说，同步确立之后，根据该同步信道的位置，能够在由规定的偏移时间（T）所确定的定时发送随机接入信号。因此，与在不固定的定时接收随机接入信号的情况相比，无须在基站侧因考虑该不固定性而确保不必那么大的缓冲器。Also, after synchronization is established, the mobile terminal can transmit a random access signal at a timing determined by a predetermined offset time (T) according to the position of the synchronization channel. Therefore, compared with the case of receiving the random access signal at a timing that is not fixed, it is not necessary to ensure an unnecessary large buffer on the base station side in consideration of the irregularity.
针对一个同步信道可以设定一次随机接入信号的发送机会（T偏移时间之后），但是也可以设定多次（例如两次）。例如，针对同步信道，也可以在偏移时间T、2T之后给予随机接入信号的发送机会。当在最初的机会中存在冲突时，也不用等待同步信道的发送周期就能够得到下一个机会。The transmission opportunity of the random access signal may be set once (after the T offset time) for one synchronization channel, but may also be set multiple times (for example, twice). For example, for a synchronization channel, a random access signal transmission opportunity may be given after an offset time T, 2T. When there is a collision in the first opportunity, the next opportunity can be obtained without waiting for the transmission cycle of the synchronization channel.
此外，作为T的例子，优选为将其预先设定为比同步信道的发送周期更短，并且，如果将T设定为5子帧以下，特别是，设定为3至4子帧，则能非常恰当并具有优势地进行同步信道的捕捉处理、发送处理这双方。In addition, as an example of T, it is preferable to set it in advance to be shorter than the transmission period of the synchronization channel, and if T is set to 5 subframes or less, especially 3 to 4 subframes, then Both capture processing and transmission processing of the synchronization channel can be performed very appropriately and advantageously.
2．非切换状态的其他终端不能使用1中示出的切换时可以发送随机接入信号的定时和频率。2. Other terminals in the non-handover state cannot use the timing and frequency at which the random access signal can be sent during handover shown in 1.
即，将针对非切换状态的其他终端指定发送随机接入信号的定时、频率设为该切换时的随机接入信号的定时和频率以外的定时、频率。That is, the timing and frequency at which random access signals are designated to be transmitted for other terminals in the non-handover state are set to a timing and frequency other than the timing and frequency of random access signals at the time of handover.
由此，能够大大降低移动目的（切换目的）基站接收部中随机接入信号的冲突概率，能够缩短切换所需要的时间。Accordingly, it is possible to significantly reduce the collision probability of random access signals in the receiving unit of the moving destination (handover destination) base station, and shorten the time required for handover.
3．当不存在正要针对某个基站的小区进行切换的终端时，该基站的调度器将2中所示的仅有切换时的终端可以独占使用的定时和频率，分配给该小区内的其他终端正要向该基站发送的上行链路信号使用。例如，基于如下来判断是否存在正在切换的终端，即：根据从相邻小区的基站或aGW（access Gate Way。与WCDMA系统的基站控制装置对应）发送的切换相关的信令（表示切换开始的信令，与切换对象的终端相关的信息，要求确保切换来的移动终端用的无线资源的信令等）、以及在切换结束后为了直接（或间接）显示终端向切换目的基站的切换已经结束而发送的控制信号等。3. When there is no terminal that is about to switch to the cell of a certain base station, the scheduler of the base station allocates the timing and frequency shown in 2 that only the terminal during the handover can exclusively use to other terminals in the cell The uplink signal being sent to the base station is used. For example, whether there is a handover terminal is judged based on the following: according to the handover-related signaling (indicating the handover start Signaling, information related to the terminal to be handed over, signaling to secure radio resources for the mobile terminal to be handed over, etc.), and to directly (or indirectly) indicate that the handover of the terminal to the handover target base station has been completed after the handover is completed And send the control signal and so on.
在不存在正要进行切换的终端时，能够避免因不使用无线资源（切换终端用随机接入信号发送定时和频率）而导致的无线资源利用效率的降低。When there is no terminal to be handed over, it is possible to avoid a decrease in radio resource utilization efficiency due to non-use of radio resources (switching of timing and frequency of random access signal transmission by terminals).
4．在切换时可以发送随机接入信号的定时和频率中所使用的适合前导码的CAZAC序列的索引，使用当利用了该序列时前导码部的PAPR较小的索引。4. The index of the CAZAC sequence suitable for the preamble used for the timing and frequency at which the random access signal can be transmitted at the time of handover is used, and the PAPR of the preamble portion is smaller when this sequence is used.
能够降低前导码部发送时的发送信号放大器中的输出功率回退量。正在切换的终端处于小区边缘附近，距基站的距离较远，需要较高的发送功率，而如果使回退量较小的话，则能够得到如下的效果：（1）能够提高平均发送功率、（2）能够降低发送功率不够的可能性。It is possible to reduce the amount of output power fallback in the transmission signal amplifier when the preamble portion is transmitted. The terminal being handed over is near the edge of the cell, and the distance from the base station is relatively long, which requires higher transmission power. If the amount of backoff is reduced, the following effects can be obtained: (1) The average transmission power can be increased, ( 2) The possibility of insufficient transmission power can be reduced.
所谓PAPR小的索引，可以假设为例如图2中的PAPR超过6dB的索引以外的索引。此外，作为PAPR比较小的索引也可以从1～75、132～168、225～298的范围中选择索引。如果用序列长度L来表现的话，也可以在1～L/3、L/2-L/16～L/2+L/16、2L/3～L-1的范围内选择。An index with a small PAPR can be assumed to be, for example, an index other than an index with a PAPR exceeding 6 dB in FIG. 2 . In addition, as an index with a relatively small PAPR, an index may be selected from a range of 1 to 75, 132 to 168, and 225 to 298. If represented by the sequence length L, it can also be selected within the range of 1 to L/3, L/2-L/16 to L/2+L/16, and 2L/3 to L-1.
5．在切换时可以发送随机接入信号的定时和频率中所使用的适合前导码的CAZAC序列的索引信息，在进行切换时由切换源基站通知该终端。5. The index information of the CAZAC sequence suitable for the preamble used for the timing and frequency of the random access signal can be transmitted at the time of handover, and the handover source base station notifies the terminal at the time of handover.
6．切换时使用的适合前导码的CAZAC序列的索引是使用PAPR小的索引。所谓PAPR小，是表示大致如下情况的PAPR：当存在于基站小区边缘的移动终端向基站发送随机接入信号时，在移动终端的发送功率的范围中，按照随机接入信号能够被基站正常接收的程度来降低发送信号放大器的动作点的回退量即可。预先计算并确定移动终端的状态在怎样的时候使用怎样索引的序列。6. The index of the CAZAC sequence suitable for the preamble used at the time of switching is an index with a smaller PAPR. The so-called PAPR is small, which means that the PAPR is roughly as follows: when a mobile terminal existing at the cell edge of the base station transmits a random access signal to the base station, the random access signal can be normally received by the base station within the range of the transmission power of the mobile terminal. It is only necessary to reduce the backoff amount of the operating point of the transmission signal amplifier to a certain extent. Pre-calculate and determine the sequence of which index to use at what time for the state of the mobile terminal.
7．在切换时使用的适合前导码的CAZAC序列的索引信息，在进行切换时由切换源基站通知该终端。7. The index information of the CAZAC sequence suitable for the preamble used at the time of handover is notified by the handover source base station to the terminal at the time of handover.
图3是说明本发明的实施方式的第1原理的图。FIG. 3 is a diagram illustrating a first principle of the embodiment of the present invention.
图3中，设横轴为频率，设纵轴为时间，将下行链路信号和上行链路信号的频率方向和时间方向的信号并排显示。同步信道设定在通过下行链路传送的子帧中的系统频带的中心频率附近。同步信道并不是在通过下行链路传送的全部子帧中发送，例如按照5或10帧发送一次的比例进行发送。在移动终端与基站确立同步之前，下行链路的信号和上行链路的信号是不同步的。因此，在本发明的实施方式中，当进行切换时，如果在下行链路的信号中检测到同步信道，则在从该时间开始经过时间偏移Toffset之后的时间的上行链路的子帧中搭载（保存）随机接入信号，并从移动终端向基站进行发送。由于下行链路的同步信道位于系统带宽的中心频率附近，所以假设搭载随机接入信号的频率位于上行链路的系统带宽的中心频率附近。图3中，斜线部分是发送随机接入信号的时隙。要发送的随机接入信号可以跨过多个连续子帧，不过将开始发送随机接入信号的子帧设为与随机接入信号长度无关地从下行链路的同步信道开始经过时间偏移Toffset之后的时间的上行链路的子帧。假设当随机接入信号发送失败时（当没有从基站发送响应信号时），再次在同样的地点（从经过一段时间后发送的其他下行链路的同步信道的定时开始经过时间偏移Toffset之后的上行链路上的子帧），进行随机接入信号的再次发送。当然，当针对一个同步信道给予多个随机接入信号的发送机会时，可以不等待下一个同步信道，而在接下来的发送机会中发送随机接入信号。In FIG. 3 , the horizontal axis is frequency and the vertical axis is time, and signals in the frequency direction and time direction of the downlink signal and the uplink signal are displayed side by side. The synchronization channel is set near the center frequency of the system frequency band in the subframe transmitted in the downlink. The synchronization channel is not sent in all the subframes transmitted through the downlink, for example, it is sent at a ratio of 5 or 10 frames. Until the mobile terminal establishes synchronization with the base station, the downlink and uplink signals are not synchronized. Therefore, in the embodiment of the present invention, when performing handover, if a synchronization channel is detected in a downlink signal, in the uplink subframe after the time offset Toffset elapses from that time, The random access signal is carried (stored) and transmitted from the mobile terminal to the base station. Since the downlink synchronization channel is located near the center frequency of the system bandwidth, it is assumed that the frequency on which the random access signal is carried is located near the center frequency of the uplink system bandwidth. In FIG. 3 , the hatched part is the time slot for sending the random access signal. The random access signal to be transmitted may span a plurality of consecutive subframes, but the subframe at which the random access signal starts to be transmitted is set to pass the time offset Toffset from the downlink synchronization channel regardless of the length of the random access signal Subframes of the uplink at a later time. Assume that when the transmission of the random access signal fails (when no response signal is transmitted from the base station), at the same point again (from the timing of the synchronization channel of the other downlink transmitted after a certain period of time after the elapse of the time offset Toffset subframe on the uplink), and retransmits the random access signal. Of course, when a plurality of random access signal transmission opportunities are given for one synchronization channel, the random access signal may be transmitted in the next transmission opportunity without waiting for the next synchronization channel.
图4是说明本发明实施方式的第2原理的图。FIG. 4 is a diagram illustrating a second principle of the embodiment of the present invention.
在图4中，与图3一样，设横轴为频率，设纵轴为时间，示出下行链路和上行链路的信号。图4中，示出适应如下情况的结构：系统带宽较宽，接收侧移动终端的接收带宽只有系统带宽的一半。即，在下行链路信号中，同步信道被设置在一个子帧中的两个频率附近（但是，也可以在3个以上的地方被发送）。在本发明的实施方式中，假设发送切换终端用随机接入信号的频率为上行链路信号的系统频带内的、与设定有下行链路信号内的同步信道的频率相对应的上行链路信号的频带内的频率。比如，当同步信道位于下行链路信号的被分割成2个频带的各自频带的中心部分时，设随机接入信号也位于上行链路信号的被分割成2个频带的各自频带的中心部分。此外，开始发送随机接入信号的定时设在与检测到下行链路信号内的同步信号后经过时间偏移Toffset之后相对应的上行链路信号的子帧内。图4中，斜线部分是开始发送随机接入信号的时隙。由于同步信道设在下行链路信号内的2个时隙中，因此，在上行链路信号内也存在2处可以发送随机接入信号的时隙。要发送的随机接入信号可以跨过多个连续的子帧，不过将开始发送随机接入信号的子帧设为与随机接入信号长度无关地从下行链路的同步信道开始经过时间偏移Toffset之后的时间的上行链路的子帧。假设当随机接入信号发送失败时（当从基站没有发送响应信号时），再次在同样的地点（从经过一段时间后发送的其他下行链路的同步信道的定时开始经过时间偏移Toffset之后的上行链路上的子帧），进行随机接入信号的再次发送。In FIG. 4 , as in FIG. 3 , the horizontal axis represents frequency and the vertical axis represents time, and shows downlink and uplink signals. In FIG. 4 , a structure adapted to the following situation is shown: the system bandwidth is relatively wide, and the receiving bandwidth of the mobile terminal on the receiving side is only half of the system bandwidth. That is, in the downlink signal, the synchronization channel is provided near two frequencies in one subframe (however, it may be transmitted at three or more places). In the embodiment of the present invention, it is assumed that the frequency for transmitting the random access signal for switching terminals is the uplink frequency corresponding to the frequency in which the synchronization channel in the downlink signal is set within the system frequency band of the uplink signal. The frequency within the frequency band of the signal. For example, when the synchronization channel is located at the center of each frequency band divided into two frequency bands of the downlink signal, it is assumed that the random access signal is also located at the center of each frequency band of the uplink signal divided into two frequency bands. In addition, the timing to start transmitting the random access signal is set within the subframe of the uplink signal corresponding to the time offset Toffset after the detection of the synchronization signal in the downlink signal. In FIG. 4 , the hatched part is the time slot at which the random access signal starts to be sent. Since the synchronization channel is provided in two slots in the downlink signal, there are also two slots in the uplink signal in which the random access signal can be transmitted. The random access signal to be transmitted may span a plurality of consecutive subframes, but the subframe at which the random access signal starts to be transmitted is set to be time-shifted from the downlink synchronization channel regardless of the length of the random access signal The uplink subframe of the time after Toffset. Assume that when the random access signal transmission fails (when the slave base station does not transmit a response signal), at the same place again (from the timing of the other downlink synchronization channel transmitted after a period of time after the time offset Toffset subframe on the uplink), and retransmits the random access signal.
图5～图7是示出根据本发明实施方式进行切换时的顺序的图。FIG. 5 to FIG. 7 are diagrams showing the sequence when handover is performed according to the embodiment of the present invention.
图5示出第一例。在图5中，（移动）终端将来自周围小区的信号（导频信号等）的接收功率测定结果等送至移动源基站，移动源基站确定切换（1）。于是，从移动源基站将进行切换的确认、终端的信息等送至移动目的基站。在移动目的基站中，如果从移动源基站得到信息，则进行设定，使得不将切换终端专用随机接入信号发送定时和频率分配用于发送不切换的终端的上行链路数据（2）。如前所述，该定时和频率为与发送下行链路的同步信道的频率相对应的上行链路中的频率以及从终端接收同步信道开始经过时间偏移之后的定时。当从终端与移动源基站正在通信的状态开始到（2）为止没有进行切换的终端时，可以对不进行切换的状态的终端分配切换终端用随机接入信号发送定时和频率。如果在移动目的基站中（2）的设定结束，则将包含切换时使用的随机接入信号用的CAZAC序列的序列索引的系统信息发送给移动源基站。此时，从PAPR小的CAZAC序列中进行选择并发送。如先前说明的那样，所谓PAPR小的索引可以假设为例如图2中PAPR超过6dB的索引之外的索引。而且，作为PAPR比较小的索引可以从1～75、132～168、225～298的范围中选择索引。如果用序列长度L来表现的话，也可以在1～L/3、L/2-L/16～L/2+L/16、2L/3～L-1的范围内选择。Fig. 5 shows a first example. In FIG. 5 , the (mobile) terminal sends the received power measurement results of signals (pilot signals, etc.) from surrounding cells to the source base station, and the source base station determines handover (1). Then, confirmation of the handover, terminal information, and the like are sent from the source base station to the target base station. If information is obtained from the source base station, the move destination base station sets so that the timing and frequency allocation of the random access signal dedicated to the handover terminal is not used to transmit uplink data of a terminal that does not handover (2). As described above, the timing and frequency are the frequency in the uplink corresponding to the frequency at which the synchronization channel of the downlink is transmitted and the timing after a time shift has elapsed since the terminal receives the synchronization channel. When there is no terminal in handover from the state in which the terminal is communicating with the source base station to (2), the timing and frequency of random access signal transmission for the handover terminal may be assigned to the terminal in the state not in handover. When the setting of (2) is completed in the movement destination base station, the system information including the sequence index of the CAZAC sequence for the random access signal used at the time of handover is transmitted to the movement source base station. At this time, a CAZAC sequence with a small PAPR is selected and transmitted. As explained above, the so-called low PAPR index can be assumed to be, for example, an index other than the index whose PAPR exceeds 6dB in FIG. 2 . Furthermore, as an index with a relatively small PAPR, an index can be selected from a range of 1 to 75, 132 to 168, and 225 to 298. If represented by the sequence length L, it can also be selected within the range of 1 to L/3, L/2-L/16 to L/2+L/16, and 2L/3 to L-1.
但是，也可以在将系统信息等送到移动源基站之后进行（2）的设定。从移动目的基站接收到系统信息等的移动源基站针对切换对象的终端，发送包含切换时使用的CAZAC序列的序列索引的移动目的小区的系统信息，并指示开始进行切换。然后，当存在针对该终端没有发送完的数据时，移动源基站将这些数据传送到移动目的基站。但是，也可以在切换成功后传送没有发送完的数据。However, the setting in (2) may be performed after sending the system information and the like to the source base station. The source base station, which has received system information and the like from the target base station, transmits system information of the target cell including the sequence index of the CAZAC sequence used for handover to the handover target terminal, and instructs the handover start. Then, when there is data that has not been transmitted to the terminal, the source base station of the movement transmits these data to the base station of the movement destination. However, unfinished data may also be transmitted after the handover is successful.
接受到切换开始指示的终端在（3）中，开始向移动目的小区进行同步处理。终端捕捉来自移动目的基站的下行链路的同步信道（4），向移动目的基站发送随机接入信号（同步确立信号）前导码部。前导码部中可以复用（码分复用、时分复用等）控制信息等。此时，随机接入信号前导码部的发送使用切换终端专用随机接入信号发送用的定时和频率。移动目的基站接收随机接入信号前导码部，如果正确识别该前导码部序列成功的话，则对终端进行前导码部接收确认通知和上行链路数据发送定时及频率的通知。如果终端接收到这些通知，则向移动目的基站发送表示切换结束通知的信号，如果移动目的基站接收到该信号，则一旦与终端间的无线链路确立所需要的处理结束，就向移动源基站发送切换结束通知信号。然后，移动目的基站重新开始将切换终端专用随机接入信号发送定时和频率分配为用于发送不进行切换的终端的上行链路数据（5）。In (3), the terminal that has received the instruction to start the handover starts the synchronization process with the destination cell. The terminal captures a downlink synchronization channel (4) from the destination base station, and transmits a preamble portion of a random access signal (synchronization establishment signal) to the destination base station. Control information and the like can be multiplexed (code-division multiplexed, time-division multiplexed, etc.) in the preamble portion. At this time, the timing and frequency for transmitting the random access signal dedicated to the switching terminal are used for transmission of the preamble portion of the random access signal. The destination base station receives the preamble part of the random access signal, and if it succeeds in correctly identifying the sequence of the preamble part, it notifies the terminal of the reception confirmation of the preamble part and the transmission timing and frequency of the uplink data. If the terminal receives these notifications, it sends a signal indicating the notification of the end of handover to the destination base station of the movement. Send handover end notification signal. Then, the destination base station resumes allocating the transmission timing and frequency of the random access signal dedicated to the handover terminal as uplink data for transmitting the terminal that does not perform handover ( 5 ).
图5的（2）～（5）之间是将要切换的终端用随机接入信号的发送定时和频率以独占的形式分配给正在切换的终端的时间区间。（5）之后，当没有其他正在切换的终端时，向不进行切换的状态的终端分配要切换的终端用随机接入信号的发送定时和频率。Between (2) and (5) in FIG. 5 is a time interval in which the transmission timing and frequency of the random access signal for the terminal to be handed over are allocated exclusively to the terminal being handed over. (5) After that, when there is no other terminal that is switching, the timing and frequency of transmitting the random access signal for the terminal to be switched are assigned to the terminal that is not switching.
图6示出第二例。在图6中，（移动）终端将来自周围小区的信号（导频信号等）的接收功率测定结果等发送到移动源基站，移动源基站确定切换（1）。于是，从移动源基站将进行切换的确认、终端的信息等送至移动目的基站。在移动目的基站中，如果从移动源基站得到信息，则进行设定，使得不将切换终端专用随机接入信号发送定时和频率分配用于发送不进行切换的终端的上行链路数据（2）。如前所述，该定时和频率为与发送下行链路的同步信道的频率相对应的上行链路中的频率以及从终端接收同步信道开始经过时间偏移之后的定时。当从终端与移动源基站正在通信的状态开始到（2）为止没有进行切换的终端时，可以针对不进行切换的状态的终端分配切换终端用随机接入信号发送定时和频率。在图5的第一例中，如果移动目的基站中（2）的设定结束，则将包含切换时使用的随机接入信号用的CAZAC序列的序列索引的系统信息发送给移动源基站。但是，也可以在将系统信息等送到移动源基站之后进行（2）的设定。但是，在图6的第二例中，通过系统说明等事先决定使用哪个序列作为随机接入信号用的CAZAC序列。从移动目的基站经由移动源基站发送到终端的系统信息中不包含CAZAC序列的信息。移动源基站针对终端发送移动目的小区的系统信息，指示开始进行切换。然后，当存在针对该终端没有发送完的数据时，移动源基站将这些数据向移动目的基站传送。但是，也可以在切换成功之后传送没有发送完的数据。Fig. 6 shows a second example. In FIG. 6 , the (mobile) terminal transmits the received power measurement results of signals (pilot signals, etc.) from surrounding cells to the source base station, and the source base station determines handover (1). Then, confirmation of the handover, terminal information, and the like are sent from the source base station to the target base station. In the transfer destination base station, if information is obtained from the transfer source base station, it is configured so that the timing and frequency allocation of the random access signal dedicated to the handover terminal is not used to transmit the uplink data of the terminal that does not perform handover (2) . As described above, the timing and frequency are the frequency in the uplink corresponding to the frequency at which the synchronization channel of the downlink is transmitted and the timing after a time shift has elapsed since the terminal receives the synchronization channel. When there is no terminal in handover from the state in which the terminal is communicating with the source base station to (2), the timing and frequency of random access signal transmission for the switching terminal may be assigned to the terminal in the state not in handover. In the first example in FIG. 5 , when the setting of (2) is completed in the destination base station, system information including the sequence index of the CAZAC sequence for the random access signal used at the time of handover is transmitted to the migration source base station. However, the setting in (2) may be performed after sending the system information and the like to the source base station. However, in the second example in FIG. 6, which sequence to use as the CAZAC sequence for the random access signal is determined in advance by system description or the like. The system information transmitted from the movement destination base station to the terminal via the movement source base station does not include CAZAC sequence information. The moving source base station sends the system information of the moving target cell to the terminal, and instructs to start handover. Then, when there is data that has not been transmitted to the terminal, the source base station transmits the data to the target base station. However, unfinished data may also be transmitted after the handover is successful.
接受到切换开始指示的终端在（3）中，开始向移动目的小区的同步处理。终端捕捉来自移动目的基站的下行链路的同步信道（4），向移动目的基站发送随机接入信号前导码部。前导码部中可以复用（码分复用、时分复用）控制信息等。此时，随机接入信号前导码部的发送使用切换终端专用随机接入信号发送用的定时和频率。移动目的基站接收随机接入信号前导码部，如果正确识别该前导码部的序列成功的话，则对终端进行前导码接收确认通知和上行链路数据发送定时及频率的通知。如果终端接收到这些通知，则向移动目的基站发送切换结束通知，如果移动目的基站接收到该通知，则一旦与终端间的无线链路确立所需要的处理结束，就向移动源基站发送切换结束通知信号。然后，移动目的基站重新开始将切换终端专用随机接入信号发送定时和频率分配为用于发送不进行切换的终端的上行链路数据（5）。The terminal that has received the handover start instruction starts the synchronization process to the destination cell in (3). The terminal captures a downlink synchronization channel (4) from the destination base station, and transmits a preamble portion of a random access signal to the destination base station. Control information and the like can be multiplexed (code-division multiplexed, time-division multiplexed) in the preamble portion. At this time, the timing and frequency for transmitting the random access signal dedicated to the switching terminal are used for transmission of the preamble portion of the random access signal. The destination base station receives the preamble part of the random access signal, and if it successfully recognizes the sequence of the preamble part, it notifies the terminal of a preamble reception confirmation and uplink data transmission timing and frequency. If the terminal receives these notifications, it sends a handover completion notification to the destination base station. If the destination base station receives the notification, it sends a handover completion notification to the migration source base station once the processing required to establish a wireless link with the terminal is completed. notification signal. Then, the destination base station resumes allocating the transmission timing and frequency of the random access signal dedicated to the handover terminal as uplink data for transmitting the terminal that does not perform handover ( 5 ).
图6（2）～（5）之间是将要切换的终端用随机接入信号的发送定时和频率以独占的形式分配给正在切换的终端的时间区间。（5）之后，当没有其他正在切换的终端时，针对不进行切换的状态的终端分配要切换的终端用随机接入信号发送定时和频率。Between (2) and (5) in FIG. 6 is a time interval in which the transmission timing and frequency of the random access signal for the terminal to be handed over are allocated exclusively to the terminal being handed over. (5) Afterwards, when there is no other terminal that is switching, the timing and frequency of random access signal transmission for the terminal to be switched are assigned to the terminal that is not switching.
图7示出第三例。在图7中，（移动）终端将来自周围小区的信号（导频信号等）的接收功率测定结果等送至移动源基站，移动源基站确定切换（1）。于是，从移动源基站将进行切换的确认、终端的信息等送至移动目的基站。在第三例中，将切换终端专用随机接入信号发送定时和频率预先设定为随机接入信号专用，以使得不将其用于其他用途。如前所述，该定时和频率为与发送下行链路的同步信道的频率相对应的上行链路中的频率以及从终端接收同步信道开始经过时间偏移之后的定时。移动目的基站将包含切换时使用的随机接入信号用的CAZAC序列的序列索引的系统信息送至移动源基站。移动源基站针对终端发送包含切换时使用的CAZAC序列的序列索引的移动目的小区的系统信息，指示开始进行切换。然后，当存在针对该终端没有发送完的数据时，移动源基站将这些数据向移动目的基站传送。但是，也可以在切换成功之后传送没有发送完的数据。Fig. 7 shows a third example. In FIG. 7 , the (mobile) terminal sends the received power measurement results of signals (pilot signals, etc.) from surrounding cells to the source base station, and the source base station determines handover (1). Then, confirmation of the handover, terminal information, and the like are sent from the source base station to the target base station. In the third example, the transmission timing and frequency of the handover terminal-specific random access signal are set in advance to be dedicated to the random access signal so that they are not used for other purposes. As described above, the timing and frequency are the frequency in the uplink corresponding to the frequency at which the synchronization channel of the downlink is transmitted, and the timing after a time shift has elapsed since the terminal receives the synchronization channel. The destination base station sends the system information including the sequence index of the CAZAC sequence for the random access signal used at the time of handover to the migration source base station. The source base station transmits to the terminal the system information of the target cell including the sequence index of the CAZAC sequence used at the time of handover, and instructs the terminal to start the handover. Then, when there is data that has not been transmitted to the terminal, the source base station transmits the data to the target base station. However, unfinished data may also be transmitted after the handover is successful.
接受到切换开始指示的终端在（2）中，开始向移动目的小区的同步处理。终端捕捉来自移动目的基站的下行链路的同步信道（3），向移动目的基站发送随机接入信号前导码部。此时，随机接入信号前导码部的发送使用切换终端专用随机接入信号发送用的定时和频率。移动目的基站接收包含随机接入信号的前导码，如果正确识别该前导码部序列成功的话，则对终端进行前导码接收确认通知和上行链路数据发送定时及频率的通知。如果终端接收到这些通知，则向移动目的基站发送切换结束通知信号，如果移动目的基站接收到该信号，则一旦与终端间的无线链路确立所需要的处理结束，就向移动源基站发送切换结束通知信号。The terminal that has received the handover start instruction starts the synchronization process to the destination cell in (2). The terminal captures a downlink synchronization channel (3) from the destination base station, and transmits a preamble portion of a random access signal to the destination base station. At this time, the timing and frequency for transmitting the random access signal dedicated to the switching terminal are used for transmission of the preamble portion of the random access signal. The destination base station receives a preamble including a random access signal, and if it successfully recognizes the preamble part sequence, it notifies the terminal of a preamble reception acknowledgment and uplink data transmission timing and frequency. If the terminal receives these notifications, it sends a handover end notification signal to the destination base station, and if the destination base station receives the signal, it sends a handover notification signal to the source base station once the processing required to establish a wireless link with the terminal is completed. End notification signal.
图8是基于本发明实施方式的移动终端的方框结构图。FIG. 8 is a block diagram of a mobile terminal based on an embodiment of the present invention.
从接收天线接收信号后，无线部10进行解调，解码部11对信号进行解码，得到用户数据/语音分组、控制信号、切换时使用的序列信息、切换指示信号。此外，无线部10的输出被送至下行链路同步信道接收处理部13中，进行同步信道接收处理，接收结果被送至切换动作控制部14中。切换动作控制部14控制为了接收同步信道而控制接收频率的接收频率控制部12、确定随机接入信号中所使用的序列的序列确定部15（以随机接入信号中所使用的序列由切换源无线基站进行通知为例来考虑）、判断随机接入信号的定时和频率的随机接入信号发送定时和频率判断部19。After receiving the signal from the receiving antenna, the wireless unit 10 demodulates the signal, and the decoding unit 11 decodes the signal to obtain user data/voice packets, control signals, sequence information used during handover, and handover instruction signals. In addition, the output of the wireless unit 10 is sent to the downlink synchronization channel reception processing unit 13 , and the synchronization channel reception processing is performed, and the reception result is sent to the handover operation control unit 14 . The handover operation control unit 14 controls the reception frequency control unit 12 that controls the reception frequency to receive the synchronization channel, and the sequence determination unit 15 that determines the sequence used in the random access signal (the sequence used in the random access signal is determined by the switching source It is considered as an example that a wireless base station performs notification), and the random access signal transmission timing and frequency determination unit 19 that determines the timing and frequency of the random access signal.
根据随机接入信号发送定时和频率判断部19的判断，发送频率控制部20控制无线部28和调制部27，按照本发明规定的定时和频率来发送随机接入信号。如果在序列确定部15中确定了使用哪个序列，则在前导码信号用序列生成部16中生成所确定的序列，随机接入前导码信号生成部17使用该序列生成包含随机接入信号的前导码信号。该信号与控制信息一起在复用部18中被复用并被输入至交换（切替）部26中。Based on the determination of the random access signal transmission timing and frequency determination unit 19, the transmission frequency control unit 20 controls the radio unit 28 and the modulation unit 27 to transmit random access signals according to the timing and frequency specified in the present invention. When it is determined which sequence to use in the sequence determination unit 15, the determined sequence is generated in the preamble signal sequence generation unit 16, and the random access preamble signal generation unit 17 uses the sequence to generate a preamble including a random access signal. code signal. This signal is multiplexed together with control information in the multiplexing unit 18 and input to the switching (switching) unit 26 .
另一方面，语音分组及用户数据、周围小区测定结果被输入到复用/交换部21中，被复用或交换输出，在信道编码部22中被编码。控制信号也在信道编码部23中被编码。信道编码部22、23的输出在复用/交换部24中被复用输出或交换输出，在物理信道生成部25中，被映射在物理信道上，然后被输入到交换部26中。在交换部26中，交换输出来自复用部18的信号和来自物理信道生成部25的信号，经由调制部27和无线部28送至发送天线。On the other hand, voice packets, user data, and surrounding cell measurement results are input to the multiplexing/switching unit 21 , are multiplexed or switched and output, and are encoded by the channel coding unit 22 . The control signal is also coded in the channel coding unit 23 . The outputs of the channel coding units 22 and 23 are multiplexed or switched in the multiplexing/exchanging unit 24 , mapped to physical channels in the physical channel generation unit 25 , and then input to the switching unit 26 . In the switching unit 26 , the signal from the multiplexing unit 18 and the signal from the physical channel generation unit 25 are switched and output, and sent to the transmission antenna via the modulation unit 27 and the radio unit 28 .
图9是基于本发明实施方式的切换时的移动源基站的方框结构图。FIG. 9 is a block configuration diagram of a moving source base station during handover according to an embodiment of the present invention.
接收天线所接收的信号在无线部30中被解调，在解码部31中被解码。从被解码后的信号中得到周围小区的测定结果，切换判断部32判断发送来周围小区测定结果的该终端是否需要进行切换。当判断为需要进行切换时，向终端的移动目的基站发送进行切换的确认信息和切换对象终端的信息。The signal received by the receiving antenna is demodulated in the wireless unit 30 and decoded in the decoding unit 31 . The measurement result of the surrounding cells is obtained from the decoded signal, and the handover judging unit 32 judges whether the terminal that sent the measurement results of the surrounding cells needs to perform handover. When it is judged that the handover is necessary, the handover confirmation information and the information of the handover target terminal are sent to the destination base station of the terminal.
如果从终端的移动目的基站发送来移动目的基站的系统信息以及切换时使用的随机接入信号前导码信息（例如，确定PAPR小的序列的序列长L、索引K等信息）的话，则切换动作处理部33生成切换开始指示信号、移动目的基站的系统信息和切换时使用的随机接入信号前导码序列信息，在物理信道生成部34中，将这些信息映射在物理信道上，经由调制部35和无线部36，从发送天线向该终端发送出去。If the system information of the mobile destination base station and the preamble information of the random access signal used during handover (for example, information such as the sequence length L and index K of the sequence with a small PAPR determined) are sent from the mobile destination base station of the terminal, the handover action The processing unit 33 generates a handover start instruction signal, the system information of the destination base station, and the preamble sequence information of the random access signal used at the time of handover. and the wireless unit 36, and transmits to the terminal from the transmitting antenna.
图10是基于本发明实施方式的切换时的移动目的基站的方框结构图。FIG. 10 is a block configuration diagram of a destination base station at the time of handover according to the embodiment of the present invention.
首先，从终端的移动源基站接收切换确认信息和切换对象终端信息。于是，切换动作处理部42向终端的移动源基站发送切换时使用的随机接入信号前导码序列信息以及基站的系统信息。此外，切换动作处理部42对上行链路无线资源管理部47进行如下请求：请求切换终端用随机接入信号的发送定时以及频率的使用限制以及请求切换终端在结束切换之前使用的上行链路无线资源的分配。上行链路无线资源管理部47经由物理信道生成部48、调制部49、无线部50向终端发送上行链路无线资源的分配信息。First, handover confirmation information and handover target terminal information are received from the mobile source base station of the terminal. Then, the handover operation processing unit 42 transmits the random access signal preamble sequence information used for handover and the system information of the base station to the mobile source base station of the terminal. In addition, the handover operation processing unit 42 makes a request to the uplink radio resource management unit 47 for switching the transmission timing of the random access signal for the terminal and the restriction on the use of the frequency, and for switching the uplink radio resource used by the terminal before the handover is completed. Allocation of resources. The uplink radio resource management unit 47 transmits allocation information of uplink radio resources to the terminal via the physical channel generation unit 48 , modulation unit 49 , and radio unit 50 .
如果经由接收天线、无线部40、解码部41接收来自切换对象终端的信号，则随机接入接收信号检测处理部43检测随机接入信号是否被送到。随机接入接收信号检测处理部43在切换动作处理部42、接收前导码确认部44的控制下进行随机接入信号的检测处理。如果接收前导码确认部44确认接收随机接入信号前导码的话，则经由物理信道生成部48、调制部49、无线部50将前导码的接收确认信息送到终端。接收到随机接入信号后，随机接入信号接收定时检测部45检测随机接入信号的接收定时，计算终端发送定时的偏移，生成上行链路发送定时校正信息信号，并经由物理信道生成部48、调制部49、无线部50将该信号送至终端。When receiving a signal from the handover target terminal via the receiving antenna, the wireless unit 40, and the decoding unit 41, the random access received signal detection processing unit 43 detects whether a random access signal is sent. The random access received signal detection processing unit 43 performs random access signal detection processing under the control of the handover operation processing unit 42 and the received preamble confirmation unit 44 . If the reception preamble confirmation unit 44 confirms reception of the random access signal preamble, it sends the reception confirmation information of the preamble to the terminal via the physical channel generation unit 48 , modulation unit 49 , and wireless unit 50 . After receiving the random access signal, the random access signal reception timing detection unit 45 detects the reception timing of the random access signal, calculates the offset of the terminal transmission timing, generates an uplink transmission timing correction information signal, and transmits it via the physical channel generation unit 48. The modulation unit 49 and the wireless unit 50 send the signal to the terminal.
当接收到从终端发送来的终端侧切换处理结束通知信号时，切换结束判断部46判断切换已结束，并向上行链路无线资源管理部47通知请求释放切换终端用随机接入信号发送定时和频率，并且一旦与终端之间的无线链路确立所需要的处理结束，就向终端的移动源基站发送切换结束通知信号。另外，经由物理信道生成部48、调制部49、无线部50从发送天线发送终端执行切换时接收的来自移动目的基站的同步信道。When receiving the terminal-side handover processing end notification signal transmitted from the terminal, the handover end judging unit 46 judges that the handover has ended, and notifies the uplink radio resource management unit 47 of the timing and timing of sending the random access signal for the terminal requesting release of the handover. frequency, and once the processing required to establish a wireless link with the terminal is completed, a handover completion notification signal is sent to the mobile source base station of the terminal. Also, the synchronization channel from the destination base station received when the terminal performs handover is transmitted from the transmission antenna via the physical channel generation unit 48 , modulation unit 49 , and radio unit 50 .
上述结构是与图5的顺序相对应的结构，但是所属领域的技术人员应该很容易联想到图6和图7情况下的结构。The above structure is a structure corresponding to the sequence in FIG. 5 , but those skilled in the art should easily think of the structures in the cases of FIG. 6 and FIG. 7 .
| Application Number | Priority Date | Filing Date | Title |
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| CN201210148734.5ACN102695226B (en) | 2006-09-28 | 2006-09-28 | Mobile radio station and radio communication system |
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| CN201210148734.5ACN102695226B (en) | 2006-09-28 | 2006-09-28 | Mobile radio station and radio communication system |
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| CN2006800559550ADivisionCN101513099B (en) | 2006-09-28 | 2006-09-28 | Wireless communication device, base station and their control method |
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| CN201210148734.5AActiveCN102695226B (en) | 2006-09-28 | 2006-09-28 | Mobile radio station and radio communication system |
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