WO2012058975A1 - 一种随机接入响应的传输方法及装置 - Google Patents

一种随机接入响应的传输方法及装置 Download PDF

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Publication number
WO2012058975A1
WO2012058975A1 PCT/CN2011/078758 CN2011078758W WO2012058975A1 WO 2012058975 A1 WO2012058975 A1 WO 2012058975A1 CN 2011078758 W CN2011078758 W CN 2011078758W WO 2012058975 A1 WO2012058975 A1 WO 2012058975A1
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Prior art keywords
msg1
transmit power
preamble sequence
transmissions
msg2
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PCT/CN2011/078758
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English (en)
French (fr)
Inventor
韩小江
丁红
杜高鹏
张现周
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中兴通讯股份有限公司
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Publication of WO2012058975A1 publication Critical patent/WO2012058975A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • H04W74/0833Random access procedures, e.g. with 4-step access

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a transmission method and apparatus for random access response. Background technique
  • MCS Modulation and Coding Scheme
  • HARQ Hybrid Automatic Repeat Request
  • the processing of MSG2 has not provided the basis for MCS and power control.
  • the UE User Equipment
  • the channel quality at this time may be applicable to UEs accessing the network. Because it has a variety of methods, such as: power control, AMC (Auto Modulation and Coding Scheme), HARQ, TTI bundling (Transmission Time Interval bundling, transmission time interval binding, that is, multiple The transmission interval is merged/bound, and a packet is transmitted). Therefore, in this case, whether the terminal can service depends largely on the transmission of MSG2.
  • the MSG1 random access first message
  • the detection of the MSG1 is detected by the correlation operation of the correlation sequence. Therefore, its ability to overcome poor channel quality is very strong.
  • the terminal after sending MSG1 once, MSG2 is not detected within the corresponding window for a long time, the terminal will initiate the next MSG1, and the power is gradually increased.
  • the maximum number of transmissions of MSG1 and the step size of power step-by-step adjustment are broadcast in the cell broadcast information. Therefore, the reliability of MSG1 can basically be solved by 4 ⁇ .
  • RACH-ConfigCommon for the retransmission configuration of MSG1, see RACH-ConfigCommon in 36.331.
  • the step size is ⁇ 0.2.4.6 ⁇ , and the maximum number of times MSG1 is sent is 200.
  • MSG1 is carried on the RACH (Random Access Channel) resource.
  • RACH Random Access Channel
  • the terminal selects the RACH preamble sequence according to the state and needs, and sends MSG1.
  • the technical problem to be solved by the present invention is to provide a transmission method and apparatus for random access response, which improves the reliability of the random access response (MSG2) of the random access procedure, thereby optimizing admission.
  • the present invention provides a method for transmitting a random access response, the method comprising:
  • the terminal When the terminal selects the random access first message (MSG1), the terminal carries the information about the transmit power and/or the number of transmission times of the MSG1 on the selected preamble sequence;
  • the system receives the MSG1, and obtains a path loss value between the terminal and the system side according to the transmit power and/or the number of times of transmission of the MSG1 carried on the preamble sequence, and adjusts the random value according to the size of the path loss value.
  • the transmission scheme of the access response message (MSG2).
  • the adjusting the transmission scheme of the MSG2 includes one of the following manners or any combination thereof:
  • MCS modulation and coding scheme
  • the step of carrying information about the transmit power and/or the number of transmissions of the MSG1 on the selected preamble sequence comprises:
  • the transmit power and/or the number of transmissions of the MSG1 are carried by selecting a corresponding preamble sequence according to a preset relationship between the transmit power and/or the number of transmissions of the MSG1 and the preamble sequence.
  • said transmitting the transmit power and/or the number of transmissions of MSG1 on the selected preamble sequence include:
  • the corresponding preamble sequence and the time-frequency resource combination are selected to carry the information of the transmit power and/or the number of transmissions of the MSG1.
  • the path loss value is obtained according to the following manner: the system is configured according to the transmit power of the MSG1 carried on the preamble sequence, and the received power of the detected MSG1. The path loss value is obtained.
  • the step of deriving the path loss value between the terminal and the system side according to the information about the transmit power and/or the number of transmissions of the MSG1 carried on the preamble sequence comprises:
  • the system obtains the transmit power corresponding to the number of transmissions according to the number of times the MSG1 is transmitted on the preamble sequence, and obtains the path loss value according to the transmit power and the received power of the detected MSG1.
  • the present invention also discloses a transmission apparatus for random access response, the apparatus includes a preamble sequence selection module in the terminal, and a MSG1 receiving module and an MSG2 transmission module on the system side, wherein: the preamble sequence selection module is set to Select the preamble sequence of the random access channel to send
  • the MSG1 receiving module is configured to receive the MSG1, and according to the transmit power and/or the number of times of sending the MSG1, The path loss value between the terminal and the system side;
  • the MSG2 transmitting module is configured to adjust a sending scheme of the MSG2 according to the size of the path loss value obtained by the MSG1 receiving module.
  • the MSG2 transmitting module is configured to adjust the sending scheme of the MSG2 by one of the following manners or any combination thereof:
  • the preamble sequence selection module is configured to carry information about the transmit power and/or the number of transmissions of the MSG1 in the following manner:
  • the corresponding preamble sequence time-frequency resource combination carries information of the transmit power and/or the number of transmissions of the MSG1.
  • the MSG1 receiving module is configured to: when receiving the MSG1, obtain the path loss value according to the following method:
  • the transmit power corresponding to the number of transmissions is obtained according to the number of transmissions of the MSG1 carried on the preamble sequence, and the path loss value is obtained according to the transmit power and the received power of the detected MSG1.
  • the transmission scheme of the random access response in the random access process described above can improve the transmission reliability and stability of the MSG2, thereby optimizing the random access process and enhancing the network acceptance capability.
  • FIG. 1 is a flowchart of random access of a terminal according to an embodiment of the present invention
  • FIG. 2 is a flow chart of processing and transmitting MSG2 on the system side according to an embodiment of the present invention.
  • the main idea of the present embodiment is to carry the transmission power and/or the number of transmission times of the MSG1 on the preamble sequence of the MSG1, and the system side obtains the path loss and channel quality between the terminal and the system side according to the transmission power or the number of transmission times of the MSG1. And according to the obtained path loss or channel quality information, the transmission power of the MSG2, the MCS (modulation and demodulation scheme) is adjusted, and the transmission reliability of the MSG2 is improved, thereby optimizing the random access procedure.
  • the present embodiment provides a method for transmitting a random access response, and specifically adopts the following technical solutions:
  • the terminal When the terminal sends the MSG1 by selecting the preamble sequence of the RACH channel, the terminal carries the transmit power and/or the number of times of transmission of the MSG1 on the selected preamble sequence;
  • the system receives the MSG1, and obtains a path loss between the terminal and the system side according to the transmit power and/or the number of transmissions of the MSG1 carried on the preamble sequence, and adjusts the sending of the MSG2 according to the size of the path loss value.
  • the base station side may adjust the transmission scheme of the MSG2 according to the threshold of the set path loss value and the adjustment step.
  • the method may include: increasing the transmission power or reducing the MCS or using retransmission or TTI when the path loss reaches the set threshold. Bundling, wherein the threshold value and the step size can be obtained by simulation.
  • the bearer mode of the transmit power and/or the number of times of transmission of the MSG1 includes: selecting a corresponding preamble sequence according to a preset correspondence between the transmit power and/or the number of transmissions of the MSG1 and the preamble sequence, thereby indicating the MSG1 Transmit power and/or number of transmissions.
  • the bearer mode of the transmit power and/or the number of times of transmission of the MSG1 includes: a corresponding preamble sequence and a time frequency according to a preset correspondence between a transmit power and/or a number of transmissions of the MSG1 and a preamble sequence and a time-frequency resource combination. The combination of resources, thereby indicating the transmit power and/or the number of transmissions of MSG1.
  • the system is configured according to the bearer on the preamble sequence.
  • the system after receiving the MSG1, the system obtains the transmit power corresponding to the number of times of sending according to the number of times of sending the MSG1 that is carried on the preamble sequence (can be implemented by a corresponding relationship between the number of times of increase and the power adjustment, for example, in an agreement It is stated that the transmission power is adjusted by one unit step after transmitting m (m is a positive integer), and the path loss value is obtained according to the transmission power and the received power of the detected MSG1.
  • adjusting the transmit power or the MCS scheme of the MSG2 according to the size of the path loss value includes:
  • the MCS is adjusted to the MCS corresponding to the threshold.
  • the path loss threshold is defined as M0, Ml, ... Mn.
  • Mcs0, Mcsl, ...Mcsn the maximum MCS
  • FIG. 1 is a schematic flowchart of a terminal initiating random access according to an embodiment of the present invention. As shown in FIG. 1, the process is specifically described as follows.
  • Step 101 The terminal needs to initiate random access, initialize various types of access parameters, and initialize the number of times the MSG1 is sent to 0.
  • Step 102 Determine that the number of MSG1 transmissions is greater than the maximum number of transmissions. If yes, the process ends; otherwise, the next step 103 is performed.
  • Step 103 The terminal selects a RACH preamble sequence according to the transmit power and/or the number of transmissions of the MSG1, and the number of times of sending the MSG1 is +1.
  • the terminal carries the following information on the RACH preamble sequence of the MSG1 by selecting different types (groups) of RACH preamble sequences: the transmit power of the MSG1 or/and the number of transmissions.
  • Step 104 The terminal starts timing, and detects MSG2 in the corresponding time window.
  • Step 105 Determine whether MSG2 is detected in the corresponding time window. If it is detected, execute the next step 106. Otherwise, return to step 102.
  • Step 106 The terminal initiates the MSG3 according to the authorization information of the MSG2, and completes the random access process, and the process ends.
  • the manner of transmitting the transmission power or/and the number of transmissions of the MSG1 is implemented by selecting different types of RACH preamble sequences, such as: the first group of sequences is used for initial power or the first transmission, and the second group is used according to Configure the power adjustment step to be used once or after the second transmission, and so on.
  • Each set of sequences has a plurality of selectable sequences, and the sequences in each set of sequences can be randomly selected, or the corresponding sequences can be selected in different sets of sequences.
  • the receiving end determines the transmitting power or the number of transmissions of the MSG1 according to the type of the RACH preamble sequence.
  • the carrier mode may also be implemented by using different sequence and time-frequency resource combinations, such as: a group of sequences is the first transmission or initial power of the MSG1 on the time-frequency resource one, and on the time-frequency resource two. After adjusting for one power step or the second time; for the second group of sequences, corresponding to the first group, when the corresponding sequence is on the time-frequency resource one, the MSG1 is adjusted by two power steps or the third time is transmitted. , MSG1 three power step adjustment when the corresponding sequence is on time-frequency resource two Post or fourth launch, and so on.
  • the receiving end (system side) determines the transmitting power or the number of transmissions of the MSG1 according to the received RACH preamble sequence and time-frequency resource combination information of the MSG1.
  • FIG. 2 is a schematic diagram of a process of transmitting MSG2 after receiving MSG1 on the system side according to an embodiment of the present invention.
  • the process mainly includes the following steps.
  • Step 201 The system side simultaneously confirms the number of times of sending MSG1 or the power of the MSG1 carried by the RACH preamble sequence according to the detected MSG1.
  • Step 202 Calculate a path loss between the terminal and the system side according to the received power of the MSG1 detected when detecting the MSG1.
  • Step 203 Adjust the transmit power of the MCS and/or the MSG2 according to the calculated path loss information.
  • Step 204 The system side transmits MSG2 according to the detected MSG1 group MSG2 information and according to the determined MCG and/or transmit power of the MSG2, and the process ends.
  • the system side parses the received MSG1 to obtain the transmit power or the number of transmissions of the MSG1; and obtains the path loss between the terminal and the system side according to the received power of the detected MSG1 and the learned transmit power of the MSG1; Finally, the system side adjusts the transmit power and MCS scheme of the MSG2 according to the obtained path loss value. For example, based on the magnitude of the path loss value, after the predetermined threshold is reached, the MCS is adjusted to the MCS corresponding to the threshold. For the power adjustment, the existing technology can be referred to. For example, the system side adjusts the downlink data transmission power according to the calculated path loss value, and uses the power of the cell reference signal as a reference.
  • the system side may also learn the current channel quality information according to the number of times the MSG1 is sent, and adjust the transmit power and the MCS scheme of the MSG2 according to the channel quality information. For example, when the number of transmissions is greater than the predetermined threshold, the transmission power is increased or the MCS is lowered or retransmission or TTI bundling is used, and details are not described herein.
  • the embodiment further discloses a transmission device for random access response, and the device package The preamble sequence selection module in the terminal, and the MSG1 receiving module and the MSG2 transmitting module on the system side, wherein:
  • the preamble sequence selection module is configured to select a preamble sequence of the random access channel to send the MSG1, and carry the transmit power and/or the number of times of transmission of the MSG1 on the selected preamble sequence;
  • the MSG1 receiving module is configured to receive the MSG1, and obtaining a path loss between the terminal and the system side according to the transmit power and/or the number of times of transmission of the MSG1;
  • the MSG2 transmitting module is configured to adjust a sending scheme of the MSG2 according to the size of the path loss value obtained by the MSG1 receiving module.
  • the MSG2 transmitting module is configured to adjust the sending scheme of the MSG2 by one of the following manners or any combination thereof:
  • the preamble sequence selection module is configured to carry the transmit power and/or the number of transmission times of the MSG1 by:
  • Transmitting the transmit power and/or the number of transmissions of the MSG1 by selecting a corresponding preamble sequence according to a preset correspondence between the transmit power and/or the number of transmissions of the MSG1 and the preamble sequence; or, according to a preset transmission of the MSG1 Corresponding relationship between the power and/or the number of transmissions and the combination of the preamble sequence and the time-frequency resource, by transmitting the corresponding preamble sequence and the time-frequency resource combination to carry the transmission power and/or the number of transmissions of the MSG1.
  • the MSG1 receiving module is configured to: when receiving the MSG1, obtain the path loss value according to the following method:
  • the transmit power corresponding to the number of transmissions is obtained according to the number of transmissions of the MSG1 carried on the preamble sequence, and the path loss value is obtained according to the transmit power and the received power of the detected MSG1.
  • the present invention provides a method and apparatus for transmitting a random access response, which improves the reliability of a random access procedure random access response (MSG2), thereby optimizing admission.
  • MSG2 random access procedure random access response
  • the system side By carrying the information about the transmit power and/or the number of transmissions of the MSG1 on the preamble sequence of the MSG1, the system side obtains the path loss value and the channel quality between the terminal and the system side according to the transmit power or the number of transmission times of the MSG1, and according to the obtained
  • the path loss or channel quality information adjusts the transmit power of the MSG2, MCS (modulation and demodulation scheme). ⁇
  • MCS modulation and demodulation scheme

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本发明公开了一种随机接入响应的传输方法及装置,终端在选择随机接入信道的前导序列发送MSG1时,在选择的前导序列上承载MSG1的发射功率和/或发送次数信息;***接收所述MSG1,并根据所述前导序列上承载的所述MSG1的发射功率和/或发送次数信息得出终端和***侧之间的路损,根据所述路损值的大小调整MSG2的发送方案。采用本发明,能够提高MSG2的传输可靠性及稳定性,进而优化随机接入过程,增强网络的接纳能力。

Description

一种随机接入响应的传输方法及装置
技术领域
本发明涉及移动通信技术领域, 更具体地, 涉及一种随机接入响应的传 输方法及装置。 背景技术
目前的无线蜂窝通信***, 随机接入过程中基本没有功率控制, 没有
MCS ( Modulation and Coding Scheme, 调制编码方案) , 对于 MSG2 (随机 接入响应消息)也没有 HARQ ( Hybrid Automatic Repeat Request, 混合自动 重传请求)机制。 因此, 对于随机接入过程中的 MSG2的可靠传输带来了问 题。
目前对于 MSG2的处理,尚未提供 MCS及功率控制的依据。当 UE( User Equipment, 用户设备)处于小区边缘或者信道质量比较差时, 如果随机接入 过程中的 MSG2不能正确接收, 则 UE将无法接入网络, 因而无法业务。 而 此时的信道条件, 对于接入进网络的 UE来讲, 可能可以业务。 因为其有多 种克月良信道的方法,如:功率控制、 AMC( Auto Modulation and Coding Scheme, 自适应 MCS调整), HARQ, TTI bundling( Transmission Time Interval bundling, 传输时间间隔绑定, 即多个传输间隔进行合并 /绑定, 传输一个数据包) 。 因 此, 这种情况下, 终端能否业务很大程度上取决于 MSG2的传输。
而目前关于随机接入过程中发起的第一条消息 MSG1 (随机接入第一条 消息)的处理, 由于 MSG1使用的是相关序列, 同时对于 MSG1的检测是通 过相关序列的相关运算进行检测, 因而其克服信道质量差的能力很强。 同时, 当发送一次 MSG1后, 在相应的窗长时间内没有检测到 MSG2, 终端会发起 下一次的 MSG1 , 而且功率是逐步增加的。 MSG1 的最大发送次数以及功率 逐步调整的步长在小区广播信息中进行了广播。 因此, MSG1 的可靠性基本 可以得到 4艮好的解决。 MSG1 的重发配置参见 36.331 中 的 RACH-ConfigCommon。 步长为 {0.2.4.6} , 而 MSG1的最大发送次数为 200。 同时, MSG1承载在 RACH ( Random Access Channel, 随机接入信道 ) 资源上。 目前对于 RACH信道的前导(Preamble )序列分为三种, 分别承载 如下三类信息: 非竟争接入、 MSG3 的信息量、 普通的竟争接入。 终端根据 所处状态和需求选择 RACH前导序列, 发送 MSG1。
综上所述, 现有技术中存在如下技术问题: 由于随机接入过程的 MSG2 的传输可靠性问题, 导致了网络的接纳能力较差, 不能达到和业务的容错能 力的平衡, 甚至导致处在小区边缘或者信道质量差的用户不能接纳入网络, 从而影响了用户的满意度。 发明内容
本发明解决的技术问题是提供一种随机接入响应的传输方法及装置, 提 高随机接入过程随机接入响应 (MSG2 ) 的可靠性, 从而优化接纳。
为解决上述技术问题, 本发明提供了一种随机接入响应的传输方法, 所 述方法包括:
终端在选择随机接入信道的前导序列发送随机接入第一条消息 (MSG1 ) 时, 在选择的前导序列上承载 MSG1的发射功率和 /或发送次数的信息;
***接收所述 MSG1 , 并根据所述前导序列上承载的所述 MSG1的发射 功率和 /或发送次数信息得出终端和***侧之间的路损值, 根据所述路损值的 大小调整随机接入响应消息 (MSG2 ) 的发送方案。
优选地, 所述调整 MSG2的发送方案, 包括以下方式中的一种或其任意 组合:
调整 MSG2的发射功率; 选择调制编码方案(MCS ); 使用多个 TTI绑 定发射( TTI bundling )方案发射或者重传。
优选地,所述在选择的前导序列上承载 MSG1的发射功率和 /或发送次数 的信息的步骤包括:
根据预先设定的 MSG1 的发射功率和 /或发送次数与前导序列的对应关 系, 通过选择对应的前导序列承载所述 MSG1的发射功率和 /或发送次数。
优选地,所述在选择的前导序列上承载 MSG1的发射功率和 /或发送次数 的信息的步骤包括:
根据预先设定的 MSG1 的发射功率和 /或发送次数与前导序列及时频资 源组合的对应关系, 选择对应的前导序列及时频资源组合承载所述 MSG1的 发射功率和 /或发送次数的信息。
优选地, 所述***接收所述 MSG1时, 按照如下方式得出所述路损值: 所述***根据所述前导序列上承载的所述 MSG1的发射功率, 以及检测 的 MSG1的接收功率, 得出所述路损值。
优选地,所述根据所述前导序列上承载的所述 MSG1的发射功率和 /或发 送次数的信息得出终端和***侧之间的路损值的步骤包括:
所述***根据所述前导序列上承载的所述 MSG1的发送次数获知该发送 次数对应的发射功率, 并根据所述发射功率及检测的 MSG1的接收功率, 得 出所述路损值。
本发明还公开了一种随机接入响应的传输装置, 所述装置包括终端中的 前导序列选择模块,以及***侧的 MSG1接收模块和 MSG2发射模块,其中: 所述前导序列选择模块, 设置为选择随机接入信道的前导序列发送
MSG1 , 并在选择的前导序列上承载 MSG1的发射功率和 /或发送次数信息; 所述 MSG1接收模块, 设置为接收所述 MSG1 , 并根据所述 MSG1的发 射功率和 /或发送次数信息得出终端和***侧之间的路损值;
所述 MSG2发射模块, 设置为根据 MSG1接收模块得出的所述路损值的 大小调整 MSG2的发送方案。
优选地, 所述 MSG2发射模块设置为, 通过以下方式中的一种或其任意 组合调整所述 MSG2的发送方案:
调整 MSG2的发射功率; 选择 MCS; 使用 TTI bundling方案发射或者重 传。
优选地,所述前导序列选择模块是设置为,通过以下方式承载所述 MSG1 的发射功率和 /或发送次数的信息:
根据预先设定的 MSG1 的发射功率和 /或发送次数与前导序列的对应关 系, 选择对应的前导序列承载所述 MSG1的发射功率和 /或发送次数的信息; 或者,根据预先设定的 MSG1的发射功率和 /或发送次数与前导序列及时 频资源组合的对应关系, 选择对应的前导序列及时频资源组合承载所述 MSG1的发射功率和 /或发送次数的信息。
优选地, 所述 MSG1接收模块设置为, 接收所述 MSG1时, 按照以下方 式得出所述路损值:
根据所述前导序列上承载的所述 MSG1的发射功率, 以及检测的 MSG1 的接收功率, 得出所述路损值;
或者, 根据所述前导序列上承载的所述 MSG1的发送次数获知该发送次 数对应的发射功率, 并根据所述发射功率及检测的 MSG1的接收功率, 得出 所述路损值。
釆用上述的随机接入过程中随机接入响应的传输方案, 能够提高 MSG2 的传输可靠性及稳定性, 进而优化随机接入过程, 增强网络的接纳能力。 附图概述
图 1为本发明实施例的终端随机接入的流程图;
图 2为本发明实施例的***侧处理和发射 MSG2的流程图。
本发明的较佳实施方式
本实施方式的主要思想在于, 在 MSG1的前导序列上承载 MSG1的发射 功率和 /或发送次数信息, ***侧根据 MSG1的发射功率或者发送次数得出终 端和***侧之间的路损、 信道质量, 并根据得到的路损或者信道质量信息调 整 MSG2的发射功率、 MCS (调制解调方案) , 提高 MSG2的传输可靠性, 从而对随机接入过程进行优化。
基于上述思想, 本实施方式提供一种随机接入响应的传输方法, 具体釆 用如下技术方案:
终端在选择 RACH信道的前导序列发送 MSG1时,在选择的前导序列上 承载 MSG1的发射功率和 /或发送次数信息; ***接收所述 MSG1 , 并根据所述前导序列上承载的所述 MSG1的发射 功率和 /或发送次数得出终端和***侧之间的路损, 根据所述路损值的大小调 整 MSG2的发送方案。
基站侧可以根据设定的路损值的门限及调整步长对 MSG2的发送方案进 行调整, 具体可以包括: 在路损到达设定的门限时加大发射功率或者降低 MCS或者使用重传或者 TTI bundling 其中, 所述门限值和步长可通过仿真 得出。
其中, 所述 MSG1的发射功率和 /或发送次数信息的承载方式包括: 根据预先设定的 MSG1 的发射功率和 /或发送次数与前导序列的对应关 系, 选择对应的前导序列, 从而表示了 MSG1的发射功率和 /或发送次数。
其中, 所述 MSG1的发射功率和 /或发送次数信息的承载方式包括: 根据预先设定的 MSG1 的发射功率和 /或发送次数与前导序列及时频资 源组合的对应关系, 对应的前导序列及时频资源组合, 从而表示了 MSG1的 发射功率和 /或发送次数。
优选地, 所述***接收到 MSG1 后, 根据所述前导序列上承载的所述
MSG1的发射功率, 以及检测的 MSG1的接收功率, 得出所述路损值;
或者,所述***接收到 MSG1后,根据所述前导序列上承载的所述 MSG1 的发送次数获知该发送次数对应的发射功率(可以通过增加次数和功率调整 的一个对应关系实现, 比如, 在协议中申明发射 m ( m为正整数)次后将发 射功率调整一个单位步长) , 并根据所述发射功率及检测的 MSG1的接收功 率, 得出所述路损值。
优选地, 根据所述路损值的大小调整 MSG2的发射功率或 MCS方案, 具体包括:
当达到预定门限时, 将 MCS调整到该门限对应的 MCS, 例如: 路损门 限定义为 M0、 Ml、 ...Mn。 则对应的最大 MCS: Mcs0、 Mcsl、 ...Mcsn。
为了便于阐述本实施方式, 以下将结合附图及具体实施例作进一步详细 描述, 需要说明的是, 在不冲突的情况下, 本申请中的实施例及实施例中的 特征可以相互任意组合。
图 1为本发明实施例的终端发起随机接入的流程示意图, 如图 1所示, 该流程具体描述如下。
步骤 101 , 终端需要发起随机接入, 初始化接入的各类参数, 同时初始 化 MSG1的发送次数为 0。
步骤 102, 判断 MSG1发送次数大于最大发送次数, 如果是, 则结束该 流程; 否则, 执行下一步骤 103。
步骤 103 ,终端根据 MSG1的发射功率和 /或发送次数选择 RACH前导序 列, 同时 MSG1的发送次数 +1。
该步骤中,终端通过选择不同类型(组)的 RACH前导序列在发送 MSG1 的 RACH前导序列上承载以下信息: MSG1的发射功率或者 /和发送次数。
步骤 104, 终端开始计时, 在相应的时间窗内检测 MSG2。
步骤 105, 判断在相应的时间窗内是否检测到 MSG2, 如果检测到, 则执 行下一步骤 106, 否则, 返回步骤 102。
步骤 106, 终端根据 MSG2的授权信息发起 MSG3 , 完成随机接入过程, 该流程结束。
本实施例中,承载 MSG1的发射功率或者 /和发送次数的方式是通过选择 不同类型的 RACH前导序列实现, 如: 第一组序列为初始功率或者第一次发 射时使用, 第二组为按照配置功率调整步长一次调整后或者第二次发射时使 用, 依此类推。 其中, 每一组序列具有多个可选的序列, 而每一组序列中的 序列都可以随机选择, 也可以在不同组的序列中选择相对应的序列。 接收端 (***侧)根据 RACH前导序列的类型从而判断 MSG1的发射功率或者发送 次数。
此外, 在其他实施例中, 载方式也可以通过不同的序列和时频资源组 合实现, 如: 一组序列在时频资源一上为 MSG1的首传或者初始功率, 而在 时频资源二上为一次功率步长调整之后或者第二次发射;而对于第二组序列 , 与第一组对应, 当对应序列在时频资源一上时为 MSG1两次功率步长调整后 或者第三次发射, 当对应序列在时频资源二上时为 MSG1三次功率步长调整 后或者第四次发射, 依此类推。 接收端 (***侧)根据收到的 MSG1的不同 的 RACH前导序列及时频资源组合信息,判断 MSG1的发射功率或者发送次 数。
此外, 需要说明的是, 上述实现方式只是承载方式的优选示例, 本发明 的方案并不仅限于上述提到的承载方式。
图 2为本发明实施例的***侧接收到 MSG1后, 发射 MSG2的流程示意 图。 本实施例中, 如图 2所示, 该流程主要包括以下步骤。
步骤 201 , ***侧根据检测到的 MSG1 , 同时确认 RACH前导序列承载 的 MSG1的发送次数或者功率。
步骤 202, 根据检测 MSG1时检测到的 MSG1的接收功率, 计算终端和 ***侧之间的路损。
步骤 203 , 根据计算得到的路损信息调整 MCS和 /或 MSG2的发射功率。 步骤 204, ***侧根据检测到的 MSG1 组 MSG2信息, 并根据确定的 MSG2的 MCS和 /或发射功率发射 MSG2, 该流程结束。
本实施例中, ***侧解析接收到的 MSG1 , 获得 MSG1的发射功率或者 发送次数; 并根据检测到的 MSG1的接收功率, 以及获知的 MSG1的发射功 率获得终端和***侧之间的路损; 最终***侧根据得到的路损值的大小调整 MSG2的发射功率、 MCS方案。 例如, 可以根据路损值的大小, 当达到预定 门限后, 将 MCS调整到该门限所对应的 MCS。 而功率调整则可以参考现有 技术, 如***侧根据计算的路损值调整下行数据发射功率, 以小区参考信号 的功率作为基准。
此外, 在其他实施例中, ***侧还可以根据 MSG1的发送次数获知当前 的信道质量信息, 并根据信道质量信息调整 MSG2的发射功率、 MCS方案。 例如,当发送次数大于预定门限时加大发射功率或者降低 MCS或者使用重传 或者 TTI bundling等, 在此不再赘述。
此外, 本实施方式还公开了一种随机接入响应的传输装置, 所述装置包 括终端中的前导序列选择模块, 以及***侧的 MSG1接收模块和 MSG2发射 模块, 其中:
所述前导序列选择模块, 设置为选择随机接入信道的前导序列发送 MSG1 , 并在选择的前导序列上承载 MSG1的发射功率和 /或发送次数信息; 所述 MSG1接收模块, 设置为接收所述 MSG1 , 并根据所述 MSG1的发 射功率和 /或发送次数信息得出终端和***侧之间的路损;
所述 MSG2发射模块, 设置为根据 MSG1接收模块得出的所述路损值的 大小调整 MSG2的发送方案。
优选地, 所述 MSG2发射模块设置为, 通过以下方式中的一种或其任意 组合调整所述 MSG2的发送方案:
调整 MSG2的发射功率; 选择 MCS; 使用 TTI bundling发射或者重传。 优选地, 所述前导序列选择模块设置为, 通过以下方式承载所述 MSG1 的发射功率和 /或发送次数信息:
根据预先设定的 MSG1 的发射功率和 /或发送次数与前导序列的对应关 系, 通过选择对应的前导序列承载所述 MSG1的发射功率和 /或发送次数; 或者,根据预先设定的 MSG1的发射功率和 /或发送次数与前导序列及时 频资源组合的对应关系, 通过选择对应的前导序列及时频资源组合承载所述 MSG1的发射功率和 /或发送次数。
优选地, 所述 MSG1接收模块设置为, 接收所述 MSG1时, 按照以下方 式得出所述路损值:
根据所述前导序列上承载的所述 MSG1的发射功率, 以及检测的 MSG1 的接收功率, 得出所述路损值;
或者, 根据所述前导序列上承载的所述 MSG1的发送次数获知该发送次 数对应的发射功率, 并根据所述发射功率及检测的 MSG1的接收功率, 得出 所述路损值。
以上仅为本发明的优选实施案例而已, 并不用于限制本发明, 本发明还 可有其他多种实施例, 在不背离本发明精神及其实质的情况下, 熟悉本领域 的技术人员可根据本发明做出各种相应的改变和变形, 但这些相应的改变和 变形都应属于本发明所附的权利要求的保护范围。
显然, 本领域的技术人员应该明白, 上述的各功能模块或各步骤可以用 通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布在多 个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程序代 码来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 并且在 某些情况下, 可以以不同于此处的顺序执行所示出或描述的步骤, 或者将它 们分别制作成各个集成电路功能模块, 或者将它们中的多个功能模块或步骤 制作成单个集成电路功能模块来实现。 这样, 本发明不限制于任何特定的硬 件和软件结合。
工业实用性
本发明提供一种随机接入响应的传输方法及装置, 提高随机接入过程随 机接入响应 (MSG2 ) 的可靠性, 从而优化接纳。 通过在 MSG1 的前导序列 上承载 MSG1的发射功率和 /或发送次数的信息,***侧根据 MSG1的发射功 率或者发送次数得出终端和***侧之间的路损值、 信道质量, 并根据得到的 路损或者信道质量信息调整 MSG2的发射功率、 MCS (调制解调方案) 。 釆 用本发明所提供的技术方案, 能够提高 MSG2的传输可靠性及稳定性, 进而 优化随机接入过程, 增强网络的接纳能力。

Claims

权 利 要 求 书
1、 一种随机接入响应的传输方法, 包括:
终端在选择随机接入信道的前导序列发送随机接入消息(MSG1 )时, 在 选择的前导序列上承载 MSG1的发射功率和 /或发送次数的信息;
***接收所述 MSG1 , 并根据所述前导序列上承载的所述 MSG1的发射 功率和 /或发送次数的信息得出终端和***侧之间的路损值, 根据所述路损值 的大小调整随机接入响应消息 (MSG2 ) 的发送方案。
2、 如权利要求 1所述的方法, 其中,
所述调整 MSG2的发送方案,包括以下方式中的一种或几种的任意组合: 调整 MSG2的发射功率; 选择调制编码方案(MCS ) ; 使用传输时间间 隔绑定( TTI bundling )方案发射或者重传。
3、如权利要求 1所述的方法,其中,所述在选择的前导序列上承载 MSG1 的发射功率和 /或发送次数的信息的步骤包括:
根据预先设定的 MSG1 的发射功率和 /或发送次数与前导序列的对应关 系, 选择对应的前导序列承载所述 MSG1的发射功率和 /或发送次数信息。
4、如权利要求 1所述的方法,其中,所述在选择的前导序列上承载 MSG1 的发射功率和 /或发送次数的信息的步骤包括:
根据预先设定的 MSG1 的发射功率和 /或发送次数与前导序列及时频资 源组合的对应关系, 选择对应的前导序列及时频资源组合承载所述 MSG1的 发射功率和 /或发送次数的信息。
5、 如权利要求 1、 2、 3或 4所述的方法, 其中, 所述根据所述前导序列 上承载的所述 MSG1的发射功率和 /或发送次数的信息得出终端和***侧之间 的路损值的步骤包括:
所述***根据所述前导序列上承载的所述 MSG1的发射功率, 以及检测 的 MSG1的接收功率, 得出所述路损值。
6、 如权利要求 1、 2、 3或 4所述的方法, 其中, 所述根据所述前导序列 上承载的所述 MSG1的发射功率和 /或发送次数的信息得出终端和***侧之间 的路损值的步骤包括:
所述***根据所述前导序列上承载的所述 MSG1的发送次数获知该发送 次数对应的发射功率, 并根据所述发射功率及检测的 MSG1的接收功率, 得 出所述路损值。
7、 一种随机接入响应的传输装置, 包括终端中的前导序列选择模块, 以 及***侧的随机接入第一条消息 (MSG1 )接收模块和随机接入响应消息 ( MSG2 )发射模块, 其中:
所述前导序列选择模块设置为: 选择随机接入信道的前导序列发送 MSG1 ,并在选择的前导序列上承载 MSG1的发射功率和 /或发送次数的信息; 所述 MSG1接收模块设置为: 接收所述 MSG1 , 并根据所述 MSG1的发 射功率和 /或发送次数的信息得出终端和***侧之间的路损值;
所述 MSG2发射模块设置为: 根据 MSG1接收模块得出的所述路损值的 大小调整 MSG2的发送方案。
8、 如权利要求 7所述的装置, 其中,
所述 MSG2发射模块是设置为通过以下方式中的一种或几种的任意组合 调整所述 MSG2的发送方案:
调整 MSG2的发射功率; 选择调制编码方案(MCS ) ; 使用传输时间间 隔绑定( TTI bundling )方案发射或者重传。
9、 如权利要求 7或 8所述的装置, 其中,
所述前导序列选择模块是设置为通过以下方式承载所述 MSG1的发射功 率和 /或发送次数的信息:
根据预先设定的 MSG1 的发射功率和 /或发送次数与前导序列的对应关 系, 选择对应的前导序列承载所述 MSG1的发射功率和 /或发送次数的信息; 或者,根据预先设定的 MSG1的发射功率和 /或发送次数与前导序列及时 频资源组合的对应关系, 选择对应的前导序列及时频资源组合承载所述 MSG1的发射功率和 /或发送次数的信息。
10、 如权利要求 7或 8所述的装置, 其中, 所述 MSGl接收模块是设置为按照以下方式得出所述路损值:
根据所述前导序列上承载的所述 MSG1的发射功率, 以及检测的 MSG1 的接收功率, 得出所述路损值;
或者, 根据所述前导序列上承载的所述 MSG1的发送次数获知该发送次 数对应的发射功率, 并根据所述发射功率及检测的 MSG1的接收功率, 得出 所述路损值。
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