CN102111255B - Adaptive error detection method used for cellular mobile communication system - Google Patents

Adaptive error detection method used for cellular mobile communication system Download PDF

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CN102111255B
CN102111255B CN 201110003920 CN201110003920A CN102111255B CN 102111255 B CN102111255 B CN 102111255B CN 201110003920 CN201110003920 CN 201110003920 CN 201110003920 A CN201110003920 A CN 201110003920A CN 102111255 B CN102111255 B CN 102111255B
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rtt
protocol data
data unit
time
retransmission
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CN102111255A (en )
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李云
潘志文
尤肖虎
刘楠
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东南大学
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Abstract

本发明公开了一种用于蜂窝移动通信系统的自适应差错检测方法,包括如下步骤:分别在无线链路控制协议层实体中进行用于计算接收到的相邻两个协议数据单元的时间间隔的TI抽样、用于实现滤波的TI平滑,在媒体接入控制层中进行用于获取每个协议数据单元的往返时延的RTT抽样、用于实现滤波的RTT平滑和用于获取每个差错协议数据单元的重传次数的k抽样、用于实现滤波的k平滑;设置重排定时器的超时值。 The present invention discloses an adaptive error detection method for a cellular mobile communication system, comprising the steps of: respectively two adjacent time for calculating the received protocol data units in the interval of a radio link control protocol layer entity the sampling TI, TI for implementing smoothing filtering, sampling for acquiring each RTT RTT protocol data unit in the medium access control layer, for implementing the filtering and smoothing for obtaining each of the RTT error the number of protocol data unit retransmission sample k, k for realizing the smooth filtering; set timer timeout value rearrangement. 本发明通过自适应估计MAC PDU的重传时间,优化SR-ARQ的t-Reordering值,从而准确、及时地检测MAC层丢失的分组,避免RLC的不必要重传,并降低分组的重传时延。 The present invention is estimated by the adaptive retransmission time of the MAC PDU, to optimize the value of t-Reordering SR-ARQ, so that accurate and timely detection of MAC layer packets lost, to avoid unnecessary RLC retransmissions, and reduce packet retransmission extension. 本发明实现复杂度低,不增加无线链路空中接口的开销。 The present invention achieves low complexity, without increasing the overhead of the air interface radio link.

Description

用于蜂窝移动通信系统的自适应差错检测方法 Adaptive error detection method for a cellular mobile communication system

技术领域 FIELD

[0001] 本发明属于移动通信领域,具体是一种用于蜂窝移动通信系统的差错检测方法。 [0001] The present invention belongs to the field of mobile communications, in particular a method for error detection for cellular mobile communication system. 背景技术 Background technique

[0002] 新一代移动通信系统的演进思路主要是通过采用高阶调制方式和各种有效的信道编码技术,不断增强空中接口的数据传输能力,最终使无线接口和核心网络全部走向IP(Internet Protocol)化。 [0002] The idea of ​​an evolved next generation mobile communication system is implemented by using higher order modulation and a variety of effective channel coding, the data transmission capacity of growing air interface, a wireless interface and ultimately to all core network IP (Internet Protocol ) technology.

[0003] 由于移动通信网络的无线接口部分采用无线传输方式,同有线网络相比,无线通信具有误码率高的特点,这将增加数据分组的丢失率,并引起突发丢包。 [0003] Since the wireless part of the mobile communication network interface to the wireless transmission, compared with wired networks, wireless communications has the characteristics of the error rate, which will increase the loss rate of packets of data, and cause the burst packet loss. 高丢包率将劣化高层协议的性能,从而影响数据业务的质量,尤其是会降低传输层的传输控制协议(TCP,Transmission Control Protocol)的性能。 High packet loss rate of the deterioration of the performance of higher layer protocols, thus affecting the quality of the data service, in particular degrade the performance of the transport layer Transmission Control Protocol (TCP, Transmission Control Protocol) is. 为此,蜂窝移动通信系统的空中接口通常会采用具有强纠错能力的纠错编码,以降低无线接口的丢包率。 For this reason, cellular mobile communication systems often use air interface error correction coding with error correction ability to reduce the packet loss rate of the radio interface. 但纠错编码会带来额外的开销,且纠错能力越强,这种开销越昂贵。 But will bring additional error correction coding overhead and error correction capability is stronger, the more expensive this overhead. 同时,由于无线信道的特征是随时间变化,要求编码和调制随着信道的状态动态变化,因此,新一代移动通信系统的空中接口的物理层采用自适应的编码和调制技术(AMC, Adaptive Modulation and Coding)。 Meanwhile, since the radio channel characteristics vary with time, coding, and modulation requirements with dynamic state of a channel changes, therefore, the physical layer air interface next generation mobile communication system using adaptive modulation and coding (AMC, Adaptive Modulation and Coding).

[0004] AMC能适应无线信道质量的动态变化,在降低空中无线接口的误码率的同时,提高无线频谱的利用率。 [0004] AMC can adapt to the dynamic changes in quality of wireless channels, while reducing the error rate of the air interface, to improve radio spectrum efficiency. 然而,即使采用AMC技术,蜂窝移动通信系统的空中无线接口仍有较高的丢包率,不能满足高层协议。 However, even if the AMC technology, air interface of a cellular mobile communication system, packet loss rate is still high, can not meet the high-level protocol. 为此,新一代蜂窝移动通信系统在无线接口的链路层采用自动重传请求(ARQ, Automatic Repeat reQuest)技术,来进一步降低无线接口的丢包率。 For this reason, the next generation cellular mobile communication system using the packet loss rate automatic repeat request (ARQ, Automatic Repeat reQuest) technology, to further reduce the radio interface in the link layer of a wireless interface.

[0005]在宽带码分多址(WCDMA, Wideband Code Division Multiple Access)的演进版本(R5〜R9)中,其无线接口的媒体接入控制(MAC, Medium Access Control)层和无线链路控制协议(RLC,Radio Link Control)层均采用了ARQ技术。 [0005] In wideband code division multiple access (WCDMA, Wideband Code Division Multiple Access) is an evolved version (R5~R9), the media access control which wireless interface (MAC, Medium Access Control) layer and a radio link control protocol (RLC, Radio Link Control) layer ARQ techniques are used. 其中MAC层将传统的前向纠错(FEC, Forward Error Correction)和ARQ技术结合,发送方通过接收方反馈的肯定确认/ 否定确认(ACK/NACK, ACKnowledgement/Non-ACKnowledgement)决定是否重传,并在重传时采用递增冗余(IR: Incremental Redundancy)的方法自适应各种信道条件,提升系统性能。 Wherein the MAC layer ARQ technology combined with forward error correction (FEC, Forward Error Correction) and conventional front, a positive acknowledgment by the recipient the sender of the feedback / negative acknowledgment (ACK / NACK, ACKnowledgement / Non-ACKnowledgement) determines whether to retransmit, and at retransmission using incremental redundancy (IR: incremental redundancy) method for adaptive various channel conditions to improve system performance. RLC层采用选择重传机制(SR-ARQ: Selective Repeat ARQ),接收方通过ACK/NACK告诉发送方正确接收到的分组序号和错误的分组序号,而发送方只重传错误的分组。 RLC layer retransmission mechanism using a selection (SR-ARQ: Selective Repeat ARQ), the receiver via the ACK / NACK packet sequence number and the sender tells the error packet sequence number correctly received, and the sender retransmits only the erroneous packets.

[0006] WCDMA的演进版本在RLC层采用SR-ARQ的主要目的在于纠正混合自动重传请求(HARQ, Hybrid ARQ)的残余错误,以进一步降低丢包率。 [0006] WCDMA is an evolved version of the RLC layer using SR-ARQ main purpose is to correct the residual error hybrid automatic repeat request (HARQ, Hybrid ARQ), in order to further reduce the packet loss rate. 为了能对HARQ的残余错误进行纠正,接收方的SR-ARQ必须首先判断哪些分组在MAC层的HARQ中没有被正确重传。 In order to correct the residual error of HARQ, the SR-ARQ receiver must first determine which packet is not correctly retransmitted HARQ in the MAC layer. 为此,RLC的SR-ARQ联合使用失序检测和重排定时器(t-Reordering)超时机制来检测在MAC层丢失的分组,如图I所示:在图I中的h时刻,接收方(可以是用户设备(UE: user equipment)或演进基站(eNB: evolved Node-B),对应的发送方为eNB或UE,下同)接收到序号(SN:Sequence Number)为5的分组,由于序号为4的分组已经丢失,因此,此时VR(R)〈VR(H)(VR(R):期望收到的下一按序分组的序号;VR(H):已接收分组的最大序号加I)。 For this purpose, the RLC combined use of SR-ARQ disorder detection and reordering timer (t-Reordering) timeout mechanism to detect lost packets in the MAC layer, as shown in I below: h time point in FIG. I, the recipient ( may be a user equipment (UE: user equipment) or an evolved base station (eNB: evolved Node-B), corresponding to the UE or eNB sender, the same below) is received sequence number (SN as: Sequence number) is a packet 5, since the number 4 is a packet has been lost, and therefore, at this time VR (R) <VR (H) (VR (R): the next expected sequence number of the received packet in sequence; VR (H): the maximum number of packets received plus I). 当发现VR(R)〈VR(H)后,接收方启动重排定时器(t-Reordering),等待MAC层的HARQ重传,在t2时亥1J,重传定时器超时,即为重传定时器的值。 When found to VR (R) <after VR (H), the receiver reordering timer started (t-Reordering), the MAC layer waits for HARQ retransmission, the time t2 Hai 1J, retransmission timer expires, i.e. retransmission timer. 当t-Reordering超时,接收方向发送方发送状态报告(STATUS)分组,并将ACK序号(ACK-SN)和NACK序号(NACK-SN)分别设置为6和4,接收方收到STATUS分组后,选择重传序号为4的分组,从而实现差错恢复。 When t-Reordering timeout, the sender receives the status report is sent direction (STATUS) packet, and the ACK number (ACK-SN) and a number NACK (NACK-SN) are set to 4 and 6, the receiver receives the STATUS packet, ARQ packet sequence number 4 in order to achieve error recovery.

[0007] 上述SR-ARQ过程表明,t-Reordering定时器的值实际上是RLC层等待MAC层通过HARQ重传机制重传丢失的分组的时间。 [0007] The SR-ARQ process shows, t-Reordering timer value is actually waiting time of the MAC layer, the RLC layer retransmission by HARQ retransmission of lost packets. t-Reordering定时器的值对系统的性能有很大的影响,具体分析如下: T-Reordering timer value has a great influence on the performance of the system, specifically as follows:

[0008] I) t-Reordering定时器的值过小。 [0008] I) t-Reordering timer value is too small. 如果t-Reordering定时器的值设置过小,将导致RLC接收方提前发送STATUS分组,即在HARQ重传丢失的分组P的过程中发送STATUS,而RLC发送方在收到STATUS后会重传p。 If the t-Reordering timer value is set too small, will result in the RLC receiving party in advance STATUS packet transmission, i.e. retransmission process of a lost packet P STATUS in the HARQ transmission, and after receiving the RLC STATUS sender retransmits p . 因此,过小的定时器值将导致不必要的重传,这不仅会在接收方出现重复分组,同时会浪费信道资源,增加发送方的能量消耗。 Thus, the timer value is too small will result in unnecessary retransmission, which will only appear in the duplicate packet reception side, waste of channel resources will also increase the energy consumption of the sender.

[0009] 2) t-Reordering定时器的值过大。 [0009] 2) t-Reordering timer value is too large. 如果t-Reordering定时器的值设置过大,将导致RLC接收方延迟发送STATUS,从而使RLC发送方不能及时重传丢失的分组,这会增加分组的在空中接口的时延,及分组的重装(reassemble)时延,而增加时延会影响上层传输协议和实施业务的性能。 If the t-Reordering timer value is set too large, it will cause the transmission delay of the receiving side RLC STATUS, so that the RLC sender can timely retransmit the lost packets, which increases the weight of the packet delay and packet air interface means (reassemble) delay, increased delay can affect the performance and implementation of an upper layer transport protocol operations.

发明内容 SUMMARY

[0010] 发明目的:针对上述现有存在的问题和不足,本发明的目的是提供一种用于蜂窝移动通信系统的自适应差错检测方法,该方法能准确、及时地检测无线链路丢包。 [0010] Object of the invention: For the above-described conventional problems and disadvantages, an object of the present invention is to provide an adaptive error detection method for a cellular mobile communication system, the method can accurately and timely detection of a radio link loss .

[0011] 技术方案:为实现上述发明目的,本发明采用的技术方案为:一种用于蜂窝移动通信系统的自适应差错检测方法,包括如下步骤: [0011] Technical Solution: In order to achieve the above object, the technical solution of the present invention is used are: an adaptive error detection method for a cellular mobile communication system, comprising the steps of:

[0012] (I)分别在无线链路控制协议层实体中进行用于计算接收到的相邻两个协议数据单元的时间间隔的T1抽样、用于实现滤波的T1平滑,在媒体接入控制层中进行用于获取每个协议数据单元的往返时延的RTT抽样、用于实现滤波的RTT平滑和用于获取每个差错协议数据单元的重传次数的k抽样、用于实现滤波的k平滑; [0012] (I) were used to calculate the received samples T1 adjacent two protocol data unit time interval in the radio link control protocol layer entity, for implementing the smoothing filtering T1, a Media Access Control RTT sampling performed for acquiring layer round trip delay for each protocol data unit for implementing filtering and smoothing for obtaining the number of RTT for each protocol data unit error retransmission sample k, for k achieve filtering smooth;

[0013] (2)设置重排定时器的超时值; [0013] (2) Set the timer timeout value rearrangement;

[0014] 所述步骤(I)中的T1抽样、T1平滑包括如下步骤: [0014] The step (I) in the sample T1, T1 smoothing comprises the steps of:

[0015] DT1抽样:无线链路控制协议层实体每收到一个新序号为X的无线链路控制协议层协议数据单元,记录该协议数据单元的接收时间tprt,收到下一个无线链路控制子层协议数据单元时,如果该协议数据单元的序号为χ+1,则记录该协议数据单元的接收时间t_,同时计算T1的一个样本为tpftm ; [0015] DT1 sampling: a radio link control protocol layer entity receives a new sequence number for each radio link control protocol layer protocol data unit X, the recording time of the received protocol data unit tprt, receives the next radio link control when the sub-layer protocol data unit, if the sequence number of the protocol data unit is χ + 1, then recording the reception time T_ protocol data unit, while a sample T1 is calculated tpftm;

[0016] 2) T1平滑:根据下式计算平滑的T1值: [0016] 2) T1 Smoothing: smoothed value T1 is calculated according to the following formula:

[0017] ^(« + l) = ^-7;(W) + (l-^)-7;(« + l),万(0) = 0,()<β 幻, [0017] ^ ( «+ l) = ^ -7; (W) + (l - ^) - 7; (« + l), ten thousand (0) = 0, () <β phantom,

[0018] 式中,汀(《 + I)、分别为η+1时刻和η时刻的平滑后的协议数据单元接收时 When [0018] In the formula, Ting ( "+ I), respectively, the smoothed data protocol η 1 and η time timing unit receives +

间间隔,β为T1的平滑因子,Τ^η+1)为η+1时刻测得的协议数据单元接收时间间隔的样本; Interval, β is a smoothing factor of T1, Τ ^ η + 1) is η + 1 timing protocol data unit received samples measured time interval;

[0019] 所述步骤(I)中的RTT抽样、RTT平滑包括如下步骤: [0019] The step of sampling the RTT (I), RTT smoothing comprises the steps of:

[0020] A)RTT抽样:混合自动重传请求进程每发送一个肯定确认/否定确认,记录肯定确认/否定确认的发送时间tps,在收到下一个协议数据单元时,记录该协议数据单元的接收时间tpr,计算RTT的一个样本为tpr_tps,并将该RTT样本上传给混合自动重传请求实体; [0020] A) RTT sampling: a hybrid automatic repeat request process each sends a positive acknowledgment / negative acknowledgment, the recording acknowledgment / negative acknowledgment transmission time tps, at the next protocol data unit is received, the recording of the protocol data unit reception time tpr, calculated for a sample RTT tpr_tps, and upload it to the RTT sample hybrid automatic repeat request entity;

[0021] B) RTT平滑:混合自动重传请求实体每收到一个步骤A)中的RTT样本,就利用下式计算平滑的RTT值,并将计算结果上传给无线链路控制协议层实体: [0021] B) RTT smoothing: a hybrid automatic repeat request entity receives each sample of RTT step A), it is calculated by the following formula smoothed RTT value, the calculation result uploaded to a radio link control protocol layer entity:

[0022] ^m'(n + l) = a Rff(n) + (\-a) RTT(n + \), RTT(O) = O ^ ()^α [0022] ^ m '(n + l) = a Rff (n) + (\ -a) RTT (n + \), RTT (O) = O ^ () ^ α

[0023] 式中,1ΪΊΤ(η + \)^巧〒(《)分别为η+1时刻和η时刻的平滑往返时延,α为RTT [0023] In the formula, 1ΪΊΤ (η + \) ^ Qiao 〒 ( ") respectively, η + 1 smooth round-trip delay time and a time of [eta], α RTT is

的平滑因子,RTT (η+1)为η+1时刻测得的往返时延的样本; Smoothing factor, RTT (η + 1) time is η + 1 measured RTT samples;

[0024] 所述步骤(I)中的k抽样、k平滑包括如下步骤: [0024] The step (I) in the sample k, k smoothing comprises the steps of:

[0025] a)k抽样:当混合自动重传请求进程第一次检查到一个协议数据单元差错时,将该协议数据单元对应的重传次数k置0,之后每收到该协议数据单元的一次重传,k加1,直到该协议数据单元重传成功或达到最大重传次数Rmax后,将k值上传给混合自动重传请求·实体; [0025] a) k samples: When hybrid automatic retransmission request processes a first protocol data unit to check an error, the protocol data unit corresponding to the number k is set to 0, after each receipt of the retransmitted protocol data unit retransmission, k is incremented by 1 until the retransmission of the protocol data unit successfully or Rmax of the maximum number of retransmissions, the value of k uploaded to hybrid automatic repeat-request entity;

[0026] b) k平滑:混合自动重传请求实体每收到一个步骤a)中的k值,就利用下式计算平滑的k值,并将计算结果上传给无线链路控制协议层实体: [0026] b) k smoothing: a hybrid automatic repeat request entity receives each value of k a step a), it is calculated by the following formula smoothed k value, upload the results to the radio link control protocol layer entity and is calculated:

[0027] k(n + l) = rk(n) + (lr)-k(n + l), E(O) = I, y [0027] k (n + l) = rk (n) + (lr) -k (n + l), E (O) = I, y

[0028] 式中,f(H + l)、分别为η+1时刻和n时刻的平滑的混合自动重传请求协议数 [0028] In the formula, f (H + l), respectively, η + 1 time and smooth mixing time n number of automatic repeat request protocol

据单元重传次数,k(η+1)为η+1时刻测得的混合自动重传请求协议数据单元重传次数的样本,Y为k的平滑因子; According retransmission unit number, k (η + 1) time is η + 1 measured sample hybrid automatic repeat request protocol data unit number of retransmissions, Y k is a smoothing factor;

[0029] 所述步骤(2)包括: [0029] The step (2) comprises:

[0030] 当无线链路控制协议层实体检测到失序的协议数据单元时,根据下式计算并设置重排定时器的超时值: [0030] When a radio link control protocol data unit protocol layer entity detects the out of order, and is calculated according to the formula provided rearrangement timer timeout value:

[0031 ] Τ;{η) = {k{n) +1).Rn\n)-27;(η),I < k(n) <Rnmx, [0031] Τ; {η) = {k {n) +1) .Rn \ n) -27; (η), I <k (n) <Rnmx,

[0032] 式中,(…为重排定时器的超时值。 [0032] In the formula, (... rearrangement timer timeout value.

[0033] 有益效果:本发明通过自适应估计MAC层的协议数据单元(PDU, Protocol DataUnit)的重传时间,优化SR-ARQ的t-Reordering的值,从而准确、及时地检测MAC层丢失的分组,从而避免RLC的不必要的重传,并降低分组的重传时延。 [0033] Advantageous Effects: The present invention is estimated by the adaptive MAC layer protocol data unit (PDU, Protocol DataUnit) retransmission time, the optimized value of SR-ARQ t-Reordering so accurate and timely detection of missing MAC layer packets, thereby avoiding unnecessary RLC retransmissions, and reduce the delay of the retransmission packet. 本发明实现复杂度低,不增加无线链路空中接口的开销。 The present invention achieves low complexity, without increasing the overhead of the air interface radio link.

附图说明 BRIEF DESCRIPTION

[0034] 图I为RLC的SR-ARQ示意图; [0034] Figure I is a schematic diagram of the RLC SR-ARQ;

[0035] 图2为发送方和接收方的RLC实体和MAC实体的交互过程示意图; Interaction RLC entity [0035] FIG. 2 is a sender and recipient and a schematic MAC entity;

[0036] 图3为t-Recording值的计算过程示意图; [0036] FIG. 3 is a calculation value t-Recording schematic;

[0037] 图4为本发明一个具体实施例的示意图。 [0037] FIG. 4 is a schematic diagram of a particular embodiment of the present invention.

具体实施方式 detailed description

[0038] 下面结合附图和具体实施例,进一步阐明本发明,应理解这些实施例仅用于说明本发明而不用于限制本发明的范围,在阅读了本发明之后,本领域技术人员对本发明的各种等价形式的修改均落于本申请所附权利要求所限定的范围。 [0038] conjunction with the accompanying drawings and the following specific examples further illustrate the invention, it should be understood that these embodiments are illustrative only and the present invention is not intended to limit the scope of the present invention, after reading this disclosure, those skilled in the art of the present invention various modifications are equivalents fall within the present application as defined in the appended claims scope.

[0039] 如图2所示,4号PDU通过其中一个进程重传两次(传送三次)后成功到达接收方。 [0039] As shown in FIG. 2, No. 4 PDU retransmission process by which a receiving side successfully reached after twice (transmitted three times). 图2中ί力接收方正确接收到4号rou的时间,因此,为避免t-Reordering过早或延后超 FIG 2 ί force receiving side correctly receives No. 4 rou time, therefore, in order to avoid premature or delayed t-Reordering super

时,在图2示例中,TR的最优值L为: When, in the example of FIG 2, the optimum value of L is TR:

[0040] Tr =tI-tI (I) [0040] Tr = tI-tI (I)

[0041] 进一步,由图2可知, [0041] Further, as apparent from FIG 2,

[0042] TT = ζ3RTT - 27; ⑵ [0042] TT = ζ3RTT - 27; ⑵

[0043] 对于更一般的情况,一个HARQ PDU发生差错后重传k次成功,有: [0043] For a more general case, an error occurs after the HARQ PDU retransmission k successes, there are:

[0044] =(k + l)-RTT-2Ti ⑶ [0044] = (k + l) -RTT-2Ti ⑶

[0045] 在式(3)中,RTT为HARQ过程发送一个I3DU的往返时延,T1为RLC实体接收到相邻两个PDU的时间间隔。 In [0045] In the formula (3), RTT transmits a round-trip time of the HARQ process I3DU, T1 receiving the time interval of two adjacent PDU RLC entity. RTT和T1同无线信道速率、可用资源块间隔、资源块的大小、PDU的处理时间有关,同时k也与无线信道的状态、相应的调制解调和编码方式有关。 RTT and the same radio channel T1 rate, interval available resource blocks, the processing time is a resource block size, the relevant PDUs, but also radio channel state k, the corresponding modem and coding scheme related. 尽管RTKT1和k的样本可以通过测量得到,但由于无线信道的时变特性和动态的资源调度算法,RTKT1和k是时变的。 Although the sample RTKT1 and k can be obtained by measuring, but due to the varying characteristics of the wireless channel and dynamic resource scheduling algorithm, RTKT1 and k are time-varying. 因此,我们需要通过式(4)、式(5)和式(6)对RTKT1和1^进行平滑处理。 Therefore, we need the formula (4), (5) and (6) 1 ^ RTKT1 and smoothed.

[0046] RfT(n + l) = a RTf(n) + (la) RTT(n + l), ^7T(0) = 0 ()< Q ⑷ [0046] RfT (n + l) = a RTf (n) + (la) RTT (n + l), ^ 7T (0) = 0 () <Q ⑷

[0047] ΤΙ(η + ΐ) = β·Τ1(η) + (\-β)·ΤΙ(η + \), T1 (O) = O ,於卩幻, (5) [0047] ΤΙ (η + ΐ) = β · Τ1 (η) + (\ -β) · ΤΙ (η + \), T1 (O) = O, in the magic Jie, (5)

[0048] k(n + \) = rk(n) + (l-ryk(n + \), I(O) = I^ 0<γ 幻 ⑷ [0048] k (n + \) = rk (n) + (l-ryk (n + \), I (O) = I ^ 0 <γ phantom ⑷

[0049] 在式⑷中,ΪΪΊΊ'(η+ 1)、分别为η+1时刻和η时刻的平滑后的往返时延 [0049] In the formula ⑷, ΪΪΊΊ '(η + 1), respectively, η + 1 [eta] and the time smoothed round trip delay time

(平滑指通过一个低通滤波,对抽样值进行“平均”),RTT (η+1)为η+1时刻测得的往返时延的样本,α为RTT的平滑因子。 (Smoothed by a low-pass filtering means, the sample values ​​of the "average"), RTT (η + 1) is measured η + 1 time samples of the RTT, RTT [alpha] is a smoothing factor.

[0050] 在式(5)中,f (« + I)、万分别为η+1时刻和η时刻的平滑后的PDU接收时间间隔,T1 (η+1)为η+1时刻测得的PDU接收时间间隔的样本,β为T1的平滑因子。 [0050] In the formula (5), f ( «+ I), Wan are η + PDU smoothed clock time and [eta] the time of reception time interval, T1 (η + 1) is η + 1 time measured PDU reception time interval samples, β is a smoothing factor T1.

[0051] 在式(6)中,[(« + I)、石(H)分别为η+1时刻和η时刻的平滑的HARQ PDU重传次 Smooth HARQ PDU retransmission times [0051] In the formula (6), [( «+ I), stone (H) respectively, η + 1 and the time instant [eta]

数,k(n+l)为η+1时刻测得的HARQ PDU重传次数的样本,YSk的平滑因子。 Number, k (n + l) η + 1 is the time measured HARQ PDU retransmissions sample number, YSk smoothing factor.

[0052] 上述α、β、Υ的取值可由用户根据具体情况自行设定。 [0052] The above-mentioned α, β, Υ values ​​can be user-set depending on the circumstances.

[0053] 对RTT、T1和k进行平滑处理后,我们得到η时刻Tr的估计值<⑻为: [0053] After RTT, T1 and smoothed k, we obtain an estimated value of η time Tr <⑻ is:

[0054] T;(n) = (k(n) +1)' RTl\n)-27;(η),I < Έ{η) < Rmdx (7) [0054] T; (n) = (k (n) +1) 'RTl \ n) -27; (η), I <Έ {η) <Rmdx (7)

[0055] 式中,Rmax为MAC规定的最大重传次数。 [0055] Where, Rmax is the maximum number of retransmissions of MAC predetermined.

[0056] 如图3所示,t-Reordering定时器值的设置过程由接收方完成,涉及到接收方的MAC HARQ实体、HARQ进程和RLC实体(HARQ进程、HARQ实体是在3GPP TS 36. 321 [2]中定义的MAC层的功能实体,RLC实体是在3GPP TS 36. 322 [3]中定义的RLC层的功能实体),包括HARQ进程的RTT和k抽样,HARQ实体的RTT和k平滑,RLC实体的T1的抽样、平滑,以及t-Reordering定时器值的设置。 [0056] 3, t-Reordering process set timer value is completed by the recipient, relates to the recipient MAC HARQ entity, RLC entity, and the HARQ process (HARQ process, the HARQ entity in the 3GPP TS 36. 321 [2] the MAC layer functional entity defined, RLC entity in the 3GPP TS 36. 322 [3] of the functional entities as defined in the RLC layer), and includes a HARQ process RTT sampling k, k HARQ RTT and smooth entities , the T1 sample RLC entity, smooth, and t-Reordering timer value.

[0057] HARQ进程的RTT抽样功能用于获取每个TOU的往返时延,具体实现过程如下:HARQ每发送一个ACK/NACK,记录ACK/NACK的发送时间tps,在收到下一个PDU时,记录该TOU的接收时间tp,,计算RTT的一个样本为tp,-tps,并将该RTT样本上传给HARQ实体。 [0057] RTT sampling function HARQ process for obtaining a round trip delay of each TOU specific implementation process is as follows: Each transmitting a HARQ ACK / NACK, the recording ACK / NACK transmission time of the TPS, the next PDU is received in time, recording the reception time tp ,, TOU is a sample calculation of the RTT is tp, -tps, and upload it to the HARQ RTT sample entity.

[0058] HARQ实体的RTT平滑功能是实现一个简单的滤波功能,即每收到一个来自HARQ进程的RTT样本,就利用式(4)计算平滑的RTT值,并将计算结果上传给RLC实体。 [0058] HARQ RTT smoothing function entity is to achieve a simple filter function, i.e., a sample from each RTT received HARQ process, (4) value is calculated by using the smoothed RTT formula, and upload the results to the RLC entity.

[0059] HARQ进程的k抽样功能用于获取每个差错PDU的重传次数,当HARQ接收进程第一次检查到一个PDU差错时,将该PDU对应的重传次数k置0,之后每收到该rou的一次重传,k加1,直到该PDU重传成功或达到最大重传次数后,将k值上传给HARQ实体。 [0059] HARQ process k sampling function for acquiring the number of retransmissions of each PDU in error, the HARQ reception process when a first check error PDU, the PDU corresponding to the number of retransmissions k is set to 0 after each received rou to the primary retransmission, k is incremented by 1 until the PDU retransmission after successfully or the maximum number of retransmissions, the HARQ entity to upload the value of k.

[0060] HARQ实体的k平滑功能是对重传次数k进行滤波处理,即每收到一个来自HARQ进程的k样本,就利用式(5)计算平滑的k值,并将计算结果上传给RLC实体。 [0060] k is a smoothing function entity HARQ retransmission number k filtering process, i.e., a smoothed calculated for each received sample from k HARQ processes, on the use of formula (. 5) the value k, and the calculation result to the RLC upload entity.

[0061] RLC实体的T1的抽样平滑功能用于RLC接收实体计算接收到的相邻两个PDU的时间间隔,具体过程如下:每收到一个新序号为X的RLC rou,记录该rou的接收时间tprt,在收到下一个RLC PDU时,如果该PDU的序号为X+1,则记录该PDU的接收时间tp,2,同时计算T1的一个样本为tprt-tprf,最后根据式(6)计算平滑的T1值。 [0061] T1 sampling RLC entity RLC receiving entity for smoothing function calculating PDU received two adjacent time interval, the specific process is as follows: each receives a new RLC sequence number of X rou, rou recording of the received time tprt, upon receipt of the next RLC PDU, if the PDU of sequence number X + 1, the recording of the PDU reception time tp, 2, T1 is also calculated as a sample tprt-tprf, and finally according to formula (6) calculating a smoothed value of T1.

[0062] t-Reordering设置功能块的主要功能是当RLC检测到失序的PDU时,根据当前的T1' RTT和k值(即T1(Ii)、RTT (n)、k(n)),利用式(7)计算并设置定时器t-Reordering的超时值。 [0062] t-Reordering setting function block main function when the RLC detects that PDU out of sequence, according to the current T1 'RTT and k values ​​(i.e., T1 (Ii), RTT (n), k (n)), using (7) calculates and sets a timer t-Reordering timeout value formula.

[0063] 图4是本发明用于3GPP的LTE系统中的实施例。 [0063] FIG. 4 is an embodiment of the present invention in the 3GPP LTE system. 图4中的椭圆形表不服务访问点,是协议中上下协议层之间的接口,业务数据在逻辑信道DTCH (Dedicated TrafficChannel,专用业务信道),DL-SCH (DownLink Shared Channel,下行共享信道),UL-SCH(Uperlink Shared Channel,上行共享信道)信道上传输;逻辑信道DCCH (DedicatedControl Channel,专用控制信道)用于传输控制信息;逻辑信道优先区分功能和复用与去复用功能在3GPP TS 36. 321 [2]中定义,主要完成逻辑信道(包括专用控制信道和专用业务信道)的复用、去复用,并根据信道的优先权调度不同的逻辑信道。 FIG oval table 4 without service access point, is the protocol interface and the service data between the upper and lower protocol layers in a logical channel DTCH (Dedicated TrafficChannel, dedicated traffic channel), DL-SCH (DownLink Shared Channel, a downlink shared channel) , UL-SCH (Uperlink shared channel, uplink shared channel) transport channel; logical channel DCCH (DedicatedControl channel, dedicated control channel) for transmitting control information; logical channel prioritization function and multiplexing the demultiplexing functions in 3GPP TS 36.321 [2] are defined, the main logical completion (including dedicated control channel and dedicated traffic channel) multiplexing, demultiplexing, and according to the priority scheduling channel different logical channels.

[0064] 在图4中,本专利的4个功能(包括RTT、k抽样功能,RTT、k平滑功能,TI的抽样平滑功能,和t-Recording的设置功能)被分别嵌入到在3GPP TS 36. 321 [2]中定义的MAC层的HARQ进程、HARQ实体以及在3GPP TS 36. 322 [3]中定义的RLC层的功能实体中。 [0064] In Figure 4, the present patent four functions (including RTT, k sampling function, RTT, k smooth functions, TI's sampling smoothing function, and t-Recording setting function) are respectively fitted to the 3GPP TS 36 . 321 [2] HARQ process of the MAC layer defined, HARQ entities and functional entities in 3GPP TS 36. 322 RLC layer [3] as defined in. 所有功能均在接收方实现,接收方可以是eNB,也可以是UE。 All functions are achieved in the recipient, the recipient may be eNB, it may also be a UE. 具体实施如下: Specific embodiments are as follows:

[0065] I) RTT抽样:统计MAC PDU的往返时延,在MAC层的HARQ进程中实施; [0065] I) RTT sample: round-trip delay statistics of the MAC PDU, the HARQ process in the embodiment of the MAC layer;

[0066] 2) k抽样:统计差错的MAC PDU的重传次数,在MAC层的HARQ进程中实施; [0066] 2) k sampling: the number of retransmissions of MAC PDU error statistics, in the embodiment HARQ process of the MAC layer;

[0067] 3) RTT平滑:根据RTT抽样值,利用式(4)计算MAC PDU的往返时延的平均值,在MAC层的HARQ实体中实施; [0067] 3) RTT smoothness: The RTT sample values, using the formula (4) calculates an average round-trip time of the MAC PDU, the HARQ entity in the embodiment of the MAC layer;

[0068] 4)k平滑:根据k抽样值,利用式(5)计算差错的MAC PDU的重传次数的平均值,在MAC层的HARQ实体中实施; [0068] 4) k smoothness: The k sample values, using the formula (5) Calculate the average frequency error retransmission of the MAC PDU, the HARQ entity in the embodiment of the MAC layer;

[0069] 5) TI抽样平滑:统计RLC实体接收到相邻两个I3DU的时间间隔的样本,并根据样本利用式(6)计算其平均值,在RLC层的确认模式(AM: Acknowledge Mode) RLC实体实现; [0069] 5) TI sampling smoothing: Statistics RLC entity receives two adjacent I3DU sample time interval, and an average value calculated from the sample using the formula (6), the acknowledged mode RLC layer (AM: Acknowledge Mode) RLC entity to achieve;

[0070] 6) t-Reordering 设置:根据RTT、k、TI 的平均值,利用式(7)计算t-Reordering的值,并根据计算结果设置t-Reordering,在RLC层的AM RLC实体实现。 [0070] 6) t-Reordering is provided: The RTT, k, TI average value, (7) t-Reordering calcd by formula, and t-Reordering is provided according to the results achieved in the AM RLC entity of the RLC layer. [0071] 本专利提出了WCDMA演进版本中RLC实体中PDU差错检测定时器(t-Reordering)的动态优化方法。 [0071] This patent teaches a method of dynamic optimization RLC entity PDU error detection timer (t-Reordering) is an evolved version of the WCDMA. 以避免RLC层不必要的PDU重传,从而避免无线资源的浪费,节省能量消耗,并减小RLC PDU的传输时延。 The RLC layer in order to avoid unnecessary retransmission of a PDU, so as to avoid waste of radio resources, save energy consumption and reduce the transmission delay of the RLC PDU. 该方法由接收方独立完成,不需要通过空中接口交互信令消息,同时实现简单。 The method performed by the recipient without need not interact with signaling messages over the air interface, at the same time simple.

Claims (1)

  1. 1. 一种用于蜂窝移动通信系统的自适应差错检测方法,其特征在于包括如下步骤: (1)分别在无线链路控制协议层实体中进行用于计算接收到的相邻两个协议数据单元的时间间隔的T1抽样、用于实现滤波的T1平滑,在媒体接入控制层中进行用于获取每个协议数据单元的往返时延的RTT抽样、用于实现滤波的RTT平滑和用于获取每个差错协议数据单元的重传次数的k抽样、用于实现滤波的k平滑; (2)设置重排定时器的超时值; 所述步骤(I)中的T1抽样、T1平滑包括如下步骤: DT1抽样:无线链路控制协议层实体每收到一个新序号为X的无线链路控制协议层协议数据单元,记录该协议数据单元的接收时间tprt,收到下一个无线链路控制子层协议数据单元时,如果该协议数据单元的序号为x+1,则记录该协议数据单元的接收时间t_,同时计算T1的一个样本为tprt-tpr2 ; 2) T1 1. An adaptive error detection method for a cellular mobile communication system, comprising the steps of: (1) respectively adjacent to the two used to calculate the received protocol data in a radio link control protocol layer entity T1 sampling time interval unit, for realizing T1 smoothing filter performs round-trip time RTT for acquiring samples of each protocol data unit at the media access control layer, for performing the filtering and smoothing RTT for Get the number of errors for each protocol data unit retransmission sample k, k for implementing smoothing filter; (2) set the timer timeout value rearrangement; said step (I) in the sample T1, T1 smoothing comprising step: DT1 of sample: a radio link control protocol layer entity receives a new sequence number for each radio link control protocol layer protocol data unit X, the recording time of the received protocol data unit tprt, receives the next radio link control sub when the protocol data unit, if the sequence number of the protocol data unit is x + 1, then recording the reception time T_ protocol data unit, while a sample T1 is calculated tprt-tpr2; 2) T1 滑:根据下式计算平滑的T1值: T^n + l)=^!] {n) + {\-fi)-Tj{n + \), 7; (O) = O,()彡旦幻, 式中,ί(« + ΐ)万(《)分别为η+1时刻和η时刻的平滑后的协议数据单元接收时间间隔,β为T1的平滑因子,Τ^η+1)为η+1时刻测得的协议数据单元接收时间间隔的样本; 所述步骤(I)中的RTT抽样、RTT平滑包括如下步骤: A)RTT抽样:混合自动重传请求进程每发送一个肯定确认/否定确认,记录肯定确认/否定确认的发送时间tps,在收到下一个协议数据单元时,记录该协议数据单元的接收时间tpr,计算RTT的一个样本为tpr_tps,并将该RTT样本上传给混合自动重传请求实体; B) RTT平滑:混合自动重传请求实体每收到一个步骤A)中的RTT样本,就利用下式计算平滑的RTT值,并将计算结果上传给无线链路控制协议层实体: Wl (n + \) = a Rn\ri) + (\-a) RTT(n + \), RTT(O) = O ()<α<1 式中,RTT (η + I) Έϊ(η) Slip: The smoothed value calculated T1: T ^ n + l) = ^] {n) + {\ -fi) -Tj {n + \), 7; (O) = O, () San denier! magic formula, ί ( «+ ΐ) Wan (") respectively, η + 1 protocol data after smoothing in time and [eta] timing means reception time interval, beta] is T1 smoothing factor, Τ ^ η + 1) is [eta] +1 time protocol data unit received samples measured time interval; RTT sample in said step (I), RTT smoothing comprises the steps of: a) sampling RTT: a hybrid automatic repeat request process each of a transmitting acknowledgment / negative when the confirmation, the recording acknowledgment / negative acknowledgment transmission time tps, at the next protocol data unit is received, recording the received time of the protocol data unit TPR, a sample is calculated RTT tpr_tps, and upload it to a hybrid automatic RTT sample retransmission requesting entity; B) smoothed RTT: a hybrid automatic repeat request entity receives each step a) RTT sample, calculated on the use of the smoothed RTT value, a radio link control protocol layer and uploaded to the calculation result entity: Wl (n + \) = a Rn \ ri) + (\ -a) RTT (n + \), RTT (O) = O () <α <1 where, RTT (η + I) Έϊ ( η) 别为η+1时刻和n时刻的平滑往返时延,α为RTT的平滑因子,RTT (η+1)为η+1时刻测得的往返时延的样本; 所述步骤(I)中的k抽样、k平滑包括如下步骤: a) k抽样:当混合自动重传请求进程第一次检查到一个协议数据单元差错时,将该协议数据单元对应的重传次数k置O,之后每收到该协议数据单元的一次重传,k加1,直到该协议数据单元重传成功或达到最大重传次数Rmax后,将k值上传给混合自动重传请求实体; b)k平滑:混合自动重传请求实体每收到一个步骤a)中的k值,就利用下式计算平滑的k值,并将计算结果上传给无线链路控制协议层实体: k{n + \) = Y k(n) + (\-Y) k{n + l),石(0) = 1, 式中,f(« + l)、k(n)分别为n+l时刻和n时刻的平滑的混合自动重传请求协议数据单元重传次数,k(n+l)为η+1时刻测得的混合自动重传请求协议数据单元重传次数的样本,Y为k的平滑因子 Η + 1 is not smooth and round trip delay time at time n, α is a smoothing factor of the RTT, RTT (η + 1) η 1 is the measured round trip delay time of sample +; said step (I) sampling k, k smoothing comprises the steps of: a) k samples: when hybrid automatic retransmission request processes a first protocol data unit to check an error, the protocol data unit corresponding to the number of retransmissions set O k, after each received once to the protocol unit data retransmission, k is incremented by 1 until the protocol data unit retransmission success or the maximum number of retransmissions Rmax, the value of k is uploaded to a hybrid automatic repeat request entity; B) k smoothing: a hybrid automatic each retransmission requesting entity receives a value of k in step a), it is calculated by the following formula smoothed k value, the calculation result uploaded to a radio link control protocol layer entity: k {n + \) = Y k ( n) + (\ -Y) k {n + l), stone (0) = 1, where, f ( «+ l), k (n) are smooth mixing time n + l and n automatic time retransmission times retransmission request protocol data unit, k (n + l) η + 1 is the time measured by the number of samples of hybrid automatic retransmission request protocol data unit retransmission, Y is a smoothing factor k ; 所述步骤(2)包括:当无线链路控制协议层实体检测到失序的协议数据单元时,根据下式计算并设置重排定时器的超时值: K㈧=(Hn) +1) · Ίΰϊ\η) -If1 ⑻,I < k{n) < Rnmx, 式中,g(«)为重排定时器的超时值,Rfflax为最大重传次数。 ; Said step (2) comprising: a protocol data unit, when a radio link control protocol layer entity detects the out of order, and is calculated according to the formula set the timer timeout value rearrangement: K㈧ = (Hn) +1) · Ίΰϊ \ η) -If1 ⑻, I <k {n) <Rnmx, where, g ( «) rearrangement of the timer timeout value, Rfflax the maximum number of retransmissions.
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