CN1627844A - Dispatching method controlled from base station for enhancing up going dedicated channel in mobile communication system - Google Patents
Dispatching method controlled from base station for enhancing up going dedicated channel in mobile communication systemDownload PDFInfo
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Translated fromChineseDescription
Translated fromChinese技术领域technical field
本发明涉及时分双工码分多址(简称TDD CDMA)移动通信系统中具有上行增强基站(Node B)控制的调度方法，具体说来，Node B利用物理层信令对小区中的用户设备(UE)的专用信道(DCH)的传输速率、传输时间、传输时隙和传输码字进行控制，以实现Node B对小区中的UE的DCH传输的调度。The present invention relates to a scheduling method with uplink enhanced base station (Node B) control in a Time Division Duplex Code Division Multiple Access (TDD CDMA for short) mobile communication system. Specifically, Node B utilizes physical layer signaling to user equipment ( The transmission rate, transmission time, transmission time slot and transmission codeword of the dedicated channel (DCH) of the UE are controlled, so as to realize the scheduling of the DCH transmission of the UE in the cell by the Node B.
背景技术Background technique
第三代伙伴计划(简称3GPP)是实施第三代移动通信系统的技术标准化组织，其中第三代移动通信技术标准包括频分双工(FDD)和时分双工(TDD)模式。3GPP自成立至今，分别于1999年10月公布了主要包括3.84Mcps的频分双工(FDD)以及时分双工(TDD)的第三代移动通信系统技术标准，简称Release 99；于2000年又公布了主要包括3.84Mcps的频分双工(FDD)、时分双工(TDD)以及1.28Mcps的时分双工(LCR-TDD)的第三代移动通信系统技术标准，简称Release 4；并且于2001年又公布了添加高速数据分组接入(HSDPA)于3.84Mcps的频分双工(FDD)、时分双工(TDD)以及1.28Mcps的时分双工(LCR-TDD)的第三代移动通信系统技术标准，简称Release 5。目前，3GPP正在实施频分双工(FDD)和时分双工(TDD)的第三代移动通信系统上行链路增强的技术予研，并且预期将于2004年在对上述上行链路增强的技术予研的基础之上正式研究上行链路增强的技术标准化工作，所产生的技术方案将包含于未来的频分双工(FDD)和时分双工(TDD)的第三代移动通信系统技术标准，简称Release 6。The 3rd Generation Partnership Project (abbreviated as 3GPP) is a technical standardization organization implementing the 3rd generation mobile communication system, wherein the 3rd generation mobile communication technology standard includes Frequency Division Duplex (FDD) and Time Division Duplex (TDD) modes. Since its establishment, 3GPP has announced in October 1999 the third-generation mobile communication system technical standards, which mainly include 3.84Mcps frequency division duplex (FDD) and time division duplex (TDD), referred to as Release 99; Announced the technical standard of the third generation mobile communication system mainly including 3.84Mcps Frequency Division Duplex (FDD), Time Division Duplex (TDD) and 1.28Mcps Time Division Duplex (LCR-TDD), referred to as Release 4; and in 2001 In 2018, the third-generation mobile communication system that added High Speed Data Packet Access (HSDPA) at 3.84Mcps Frequency Division Duplex (FDD), Time Division Duplex (TDD) and 1.28Mcps Time Division Duplex (LCR-TDD) was announced Technical standard, Release 5 for short. At present, 3GPP is carrying out pre-research on the uplink enhancement technology of frequency division duplex (FDD) and time division duplex (TDD) third-generation mobile communication systems, and it is expected to conduct pre-research on the above-mentioned uplink enhancement technology in 2004 On the basis of formal research on the technical standardization of uplink enhancement, the resulting technical solutions will be included in the future third-generation mobile communication system technical standards of frequency division duplex (FDD) and time division duplex (TDD), referred to as Release 6.
无论第三代移动通信系统中的频分双工(FDD)的上行增强技术，还是时分双工(TDD)的上行链路增强的技术，其目的都是通过对由频分双工(FDD)和时分双工(TDD)的第三代移动通信系统所构成的无线网络的上行传输资源实施有效管理和规划来提高上述系统的上行链路的容量和上述系统的无线小区的覆盖范围，以便适合于对传输突发性较强的数据业务；此外，通过改善上行专用传输信道的性能，从而提高小区的覆盖率和吞吐量，提高上行传输速率，减少上行链路延迟。Regardless of the frequency division duplex (FDD) uplink enhancement technology in the third-generation mobile communication system or the time division duplex (TDD) uplink enhancement technology, the purpose is to pass the frequency division duplex (FDD) The uplink transmission resources of the wireless network composed of the third generation mobile communication system of time division duplex (TDD) are effectively managed and planned to improve the uplink capacity of the above system and the coverage of the wireless cell of the above system, so as to be suitable for In addition, by improving the performance of the uplink dedicated transmission channel, the coverage and throughput of the cell can be improved, the uplink transmission rate can be increased, and the uplink delay can be reduced.
第三代伙伴计划关于上行信道增强的讨论首先是从3.84Mcps的频分双工(FDD)开始的，2003年6月，RAN 20次会议同意开始研究时分双工(简称TDD)系统的上行信道增强。研究的主要项目包括基站(Node B)控制的调度、混合的请求重传(简称HARQ)等。其中关于基站(Node B)控制的调度方法，针对FDD模式，3GPP TR 25.896V0.4.2包含了两种主要的方法：一种是基站(Node B)控制的速率调度方法(也即两个阈值方案)，另一种是基站(Node B)控制的速率和时间调度方法。对于TDD模式，它们也是可能的调度方案。The discussion on the uplink channel enhancement of the Third Generation Partnership Project first started from the frequency division duplex (FDD) of 3.84Mcps. In June 2003, the 20th meeting of RAN agreed to start research on the uplink channel of the time division duplex (TDD) system. enhanced. The main research projects include base station (Node B) controlled scheduling, hybrid request retransmission (referred to as HARQ) and so on. Regarding the scheduling method controlled by the base station (Node B), for the FDD mode, 3GPP TR 25.896V0.4.2 contains two main methods: one is the rate scheduling method controlled by the base station (Node B) (that is, two threshold schemes ), the other is the rate and time scheduling method controlled by the base station (Node B). They are also possible scheduling schemes for TDD patterns.
第一种基站控制的速率调度方案中，每个用户设备在专用传输信道的初始化过程中，基站控制器(RNC)给每个UE分配一个传输格式组合集合简称TFCS)和两个TFC阈值。这个TFCS包含了多种传输速率。两个阈值中，一个是UE的阈值，另一个是Node B的阈值，UE的阈值不得大于Node B的阈值。在通信过程中，UE可以在RNC给定的TFCS中有限制地选择传输格式组合(TFC)，也就是说选择的TFC必须不得大于当前的UE阈值。如果UE使用的TFC等于当前的UE阈值，并且UE认为还具有以更高速率传输的能力(如：当前发射功率远小于额定的最大发射功率)同时UE有提高传输速率的需求时，可以向Node B请求提高UE阈值，Node B根据当前的噪音情况决定是否允许UE提高UE的阈值。如果允许UE提高阈值，UE的阈值不可超过Node B的阈值。具体的过程如下：In the first base station-controlled rate scheduling scheme, the base station controller (RNC) allocates a Transport Format Combination Set (TFCS) and two TFC thresholds to each UE during the initialization process of a dedicated transport channel for each user equipment. This TFCS includes a variety of transmission rates. Among the two thresholds, one is the UE's threshold and the other is the Node B's threshold, and the UE's threshold cannot be greater than the Node B's threshold. During the communication process, the UE can select the Transport Format Combination (TFC) with restrictions in the TFCS given by the RNC, that is to say, the selected TFC must not be greater than the current UE threshold. If the TFC used by the UE is equal to the current UE threshold, and the UE believes that it has the ability to transmit at a higher rate (for example: the current transmit power is much lower than the rated maximum transmit power) and the UE has a need to increase the transmission rate, it can send to the Node B requests to increase the UE threshold, and Node B decides whether to allow the UE to increase the UE threshold according to the current noise situation. If the UE is allowed to increase the threshold, the UE's threshold cannot exceed the Node B's threshold. The specific process is as follows:
物理层的上行信令名为速率申请(简称RR)专门用于UE申请改变当前的UE阈值。当UE希望提高当前的UE阈值时，也就是UE希望以更高的速率发送数据，将RR的值设为“Up”，当UE不希望改变当前的UE阈值时，不发送RR。当UE选择用小的数据速率发送时，可以直接使用较小的TFC即可。The uplink signaling at the physical layer is called Rate Request (RR for short), which is specially used for UE to apply to change the current UE threshold. When the UE wants to increase the current UE threshold, that is, the UE wants to send data at a higher rate, the value of RR is set to "Up". When the UE does not want to change the current UE threshold, RR is not sent. When the UE chooses to send with a small data rate, it can directly use a smaller TFC.
同时有物理层的下行信令称为速率应答(简称RG)专门用于对UE的速率申请进行应答。RG的值为“Up”时，说明Node B同意UE增加其UE阈值。当UE提出速率申请(即发送RR＝“Up”)，而Node B不应答(即不发送RG)时，说明Node B不同意UE增加UE阈值。当RG的值为“Down”时，说明Node B要求该UE降低它的UE阈值。At the same time, the downlink signaling of the physical layer is called rate response (RG for short), which is specially used to respond to the rate request of the UE. When the value of RG is "Up", it means that the Node B agrees with the UE to increase its UE threshold. When the UE makes a rate request (that is, sends RR="Up"), but the Node B does not respond (that is, does not send RG), it means that the Node B does not agree with the UE to increase the UE threshold. When the value of RG is "Down", it means that Node B requires the UE to lower its UE threshold.
第二种基站(Node B)控制的时间和速率调度方案中，UE在进行数据传输之前，需要将一些信息发给Node B以进行数据传输的请求，Node B根据收到的信息，计算出UE的无线信道的好坏，并根据当前的噪音情况以及其他UE的请求的情况，对是否允许该UE进行传输，以多大的功率进行数据传输等进行统一调度和安排。具体的过程如下：In the second time and rate scheduling scheme controlled by the base station (Node B), the UE needs to send some information to the Node B to request data transmission before performing data transmission, and the Node B calculates the UE According to the quality of the wireless channel, and according to the current noise situation and the request of other UEs, whether to allow the UE to transmit, how much power to perform data transmission, etc., conduct unified scheduling and arrangements. The specific process is as follows:
第一步：UE在的上行调度信息控制信道中，发送数据传输的请求。发送的信息包括UE的数据缓存器的状态、UE的功率状态和UE的最大功率能力。Step 1: The UE sends a request for data transmission in the uplink scheduling information control channel. The transmitted information includes the status of the UE's data buffer, the UE's power state, and the UE's maximum power capability.
第二步：Node B监测各个UE报告的数据队列长度和发射功率的信息，在小区(Cell)噪声允许的条件下选出尽量少的UE甚至可以是一个UE在下一个调度周期的时间段内进行传输。Node B通过下行调度指定控制信道对选定的UE进行应答。所传输的信息包括：允许传输时刻及时间段内，最大允许发射功率等其它的调度信息。UE的最大允许发射功率是根据NodeB的噪声增加余量，UE的数据缓存器的状态，UE的功率状态和UE的最大功率能力等因素计算出的。Step 2: Node B monitors the data queue length and transmission power information reported by each UE, and selects as few UEs as possible under the condition that the noise of the cell (Cell) allows, or even a UE to perform the transmission within the time period of the next scheduling cycle. transmission. The Node B responds to the selected UE through the designated control channel for downlink scheduling. The transmitted information includes: allowed transmission time and time period, maximum allowed transmission power and other scheduling information. The UE's maximum allowable transmit power is calculated based on factors such as the noise increase margin of the NodeB, the state of the UE's data buffer, the UE's power state, and the UE's maximum power capability.
第三步：收到调度指令信息的UE在指定时刻及时间段内/时隙传输数据。Step 3: The UE receiving the scheduling instruction information transmits data at a specified time and within a time period/slot.
速率以及时间调度方法有比速率调度更准确地控制本小区噪声水平的能力，也就是说可以使本小区的容量最大化。它的代价是需要传输的调度信息和指令比单纯的速率调度要复杂一些。The rate and time scheduling method has the ability to control the noise level of the cell more accurately than the rate scheduling method, that is to say, it can maximize the capacity of the cell. Its cost is that the scheduling information and instructions that need to be transmitted are more complicated than pure rate scheduling.
上述的针对FDD系统的第二种基站(Node B)控制的时间和速率调度方案可以更准确地控制本小区的噪声水平，使本小区的容量最大化。下面分析一下该方案在TDD系统的可行性。The above-mentioned time and rate scheduling scheme for the second base station (Node B) control of the FDD system can more accurately control the noise level of the cell and maximize the capacity of the cell. Let's analyze the feasibility of this scheme in the TDD system.
首先，从Node B调度所需的信息的内容来讲，在TDD系统中，UE上报的调度信息可以和FDD系统中UE上报的调度信息相同，也为UE的数据缓存器的状态、UE的功率状态和UE的最大功率能力。但是对于在Node B端，要测量的可用的噪声增加余量是有所不同的。在FDD系统中，需要在Node B端，要测量可用的噪声增加余量。然而在TDD系统中，业务是在时隙上传输的，因此在Node B端，要测量各个时隙上可用的噪声增加余量，作为调度指配的依据。First of all, from the content of the information required for Node B scheduling, in the TDD system, the scheduling information reported by the UE can be the same as the scheduling information reported by the UE in the FDD system, which is also the state of the UE's data buffer, the UE's power state and maximum power capability of the UE. But for the Node B side, the available noise increase margin to be measured is different. In an FDD system, it is necessary to measure the available noise increase margin at the Node B side. However, in a TDD system, services are transmitted on time slots, so at the Node B side, it is necessary to measure the noise increase margin available on each time slot as the basis for scheduling assignments.
其次，从Node B的调度指配信息的内容来讲，在FDD系统中，Node B给UE发送调度指配时，在其调度指配信息中，要包含传输格式组合集(TFCS)、传输起始时刻和传输时间间隔。然而在TDD系统中，业务是在时隙上传输的，此外TDD系统是上行码字受限的，其传输信道码字，不能由UE自主选择，因此在TDD系统中，Node B给UE发送的调度信息中除了要包含传输格式组合集(TFCS)、传输起始时刻和传输时间间隔之外，还要包含传输时隙和传输信道码字。Secondly, from the content of the scheduling assignment information of the Node B, in the FDD system, when the Node B sends the scheduling assignment to the UE, the scheduling assignment information should include the Transport Format Combination Set (TFCS), transmission start start time and transmission time interval. However, in the TDD system, services are transmitted on time slots. In addition, the TDD system has limited uplink codewords, and its transmission channel codewords cannot be independently selected by the UE. Therefore, in the TDD system, the Node B sends the UE In addition to the transmission format combination set (TFCS), transmission start time and transmission time interval, the scheduling information also contains transmission time slots and transmission channel codewords.
此外，从物理层信令的传输来讲，在FDD系统中，存在与专用物理数据信道(DPDCH)相关的专用物理控制信道(DPCCH)用于功率控制和同步等，因此在FDD系统中，可以用DPCCH来传输Node B调度的物理层信令。然而在TDD系统中，功率控制和同步信令在相应的物理信道的数据字段中传输，因此根本不存在DPCCH，因此也无法用此信道来传输Node B调度的物理层信令。因此，在TDD系统中需要引入新的物理信道来传输Node B调度的物理层信令。In addition, in terms of the transmission of physical layer signaling, in the FDD system, there is a dedicated physical control channel (DPCCH) related to the dedicated physical data channel (DPDCH) for power control and synchronization, etc., so in the FDD system, you can The DPCCH is used to transmit the physical layer signaling scheduled by the Node B. However, in a TDD system, power control and synchronization signaling are transmitted in the data field of the corresponding physical channel, so there is no DPCCH at all, so this channel cannot be used to transmit the physical layer signaling scheduled by Node B. Therefore, a new physical channel needs to be introduced in the TDD system to transmit the physical layer signaling scheduled by Node B.
从上述的分析中可以看出，针对FDD系统的基站(Node B)控制的时间和速率调度方案对于TDD系统并不完全适用。本发明提出了一种适用于TDD CDMA移动通信系统中上行专用信道(DCH)增强的基站(Node B)控制的调度方法，以实现Node B对小区中的UE的DCH传输的调度。From the above analysis, it can be seen that the time and rate scheduling scheme controlled by the base station (Node B) of the FDD system is not completely applicable to the TDD system. The present invention proposes a scheduling method applicable to the enhanced base station (Node B) control of the uplink dedicated channel (DCH) in the TDD CDMA mobile communication system, so as to realize the scheduling of the DCH transmission of the UE in the cell by the Node B.
发明内容Contents of the invention
本发明的目的是提供一种适用于TDD CDMA移动通信系统中上行专用信道(DCH)增强的基站(Node B)控制的调度方法。The purpose of the present invention is to provide a scheduling method suitable for the enhanced base station (Node B) control of uplink dedicated channel (DCH) in TDD CDMA mobile communication system.
为实现上述目的，一种移动通信系统中上行专用信道增强的基站控制的调度方法，包括步骤：In order to achieve the above object, a scheduling method for base station control of uplink dedicated channel enhancement in a mobile communication system, comprising steps:
a)Node B在广播信道上广播共享信道信息；a) Node B broadcasts shared channel information on the broadcast channel;
b)Node B设定调度信息上报的时间间隔；b) Node B sets the time interval for reporting scheduling information;
c)Node B将共享信道的序号依次通过UE的下行DPCH传给选定的UE；c) Node B transmits the sequence number of the shared channel to the selected UE through the UE's downlink DPCH in turn;
d)当UE收到共享信道的序号后，UE将在所指定的上行增强共享信息信道上发送调度信息；d) After the UE receives the sequence number of the shared channel, the UE will send scheduling information on the designated uplink enhanced shared information channel;
e)Node B在收到所有UE的调度信息后，确定所要调度的UE和调度指配信息；e) After Node B receives the scheduling information of all UEs, it determines the UEs to be scheduled and the scheduling assignment information;
f)将调度指配信息在与EU-SICH相关联的EU-SCCH上发送给需要进行调度的UE。f) Send the scheduling assignment information to the UE that needs to be scheduled on the EU-SCCH associated with the EU-SICH.
本发明利用物理层信令对小区中UE的DCH传输的传输格式组合、传输时间、传输时隙和传输码字进行控制，可以实现对小区中UE的DCH传输的快速调度。定义了两种新型的共享物理控制信道来传输物理层信令，避免了给每个UE分配一个专用物理控制信道，能够更好地缓解TDD系统的上行码字受限问题，使得信道资源可以得到有效利用。给出了Node B指配UE使用共享信道的方法，有效地避免了共享信道使用的碰撞问题。Node B通过UE的一个下行DPCH的空闲TFCI字段来给UE指配共享信道，不占用额外的扩频码字，有效地利用了信道资源。本发明对DCH传输进行调度，可以减小系统的噪声增加(Noise Rise)的方差，避免系统的过载，从而提高系统的上行小区吞吐量，增大系统的业务覆盖。本发明适用范围较广，既适用于高码率TDD移动通信系统，又适用于低码率移动通信系统。The present invention uses physical layer signaling to control the transmission format combination, transmission time, transmission time slot and transmission code word of the DCH transmission of the UE in the cell, and can realize the fast scheduling of the DCH transmission of the UE in the cell. Two new types of shared physical control channels are defined to transmit physical layer signaling, which avoids assigning a dedicated physical control channel to each UE, and can better alleviate the problem of limited uplink codewords in TDD systems, so that channel resources can be obtained use efficiently. A method for Node B to assign UE to use shared channels is given, which effectively avoids the collision problem of using shared channels. The Node B assigns a shared channel to the UE through an idle TFCI field of a downlink DPCH of the UE, which does not occupy additional spreading codewords and effectively utilizes channel resources. The invention schedules the DCH transmission, which can reduce the variance of the noise rise (Noise Rise) of the system and avoid the overload of the system, thereby improving the throughput of the uplink cell of the system and increasing the service coverage of the system. The invention has a wide application range, and is suitable for both high code rate TDD mobile communication systems and low code rate mobile communication systems.
附图说明Description of drawings
图1是高码率TDD系统中具有TFCI的业务突发结构；Figure 1 is a business burst structure with TFCI in a high code rate TDD system;
图2是低码率TDD系统中具有TFCI的业务突发结构；Fig. 2 is the business burst structure with TFCI in the low code rate TDD system;
图3是上行DCH增强的Node B控制的调度方法中Node B的操作流程图；Fig. 3 is the operation flowchart of Node B in the scheduling method of Node B control of uplink DCH enhancement;
图4是上行DCH增强的Node B控制的调度方法中UE的操作流程图；Fig. 4 is the operation flowchart of UE in the scheduling method controlled by Node B of uplink DCH enhancement;
图5是上行DCH增强的Node B控制的调度方法的信令流程图；Fig. 5 is the signaling flowchart of the scheduling method controlled by the Node B of the uplink DCH enhancement;
图6是低码率TDD系统中Node B控制的调度过程的实施例示意图。Fig. 6 is a schematic diagram of an embodiment of a scheduling process controlled by Node B in a low code rate TDD system.
具体实施方式Detailed ways
本发明提出了一种适用于TDD CDMA移动通信系统中上行专用信道(DCH)增强的基站(Node B)控制的调度方法，该方法是通过Node B对小区中的用户设备(UE)的专用信道(DCH)的传输进行控制，实现对小区中UE的DCH传输的调度。具体来讲，Node B利用物理层信令，对UE的DCH的传输格式组合集(TFCS)、传输时间、传输时隙和传输码字进行控制，实现对小区中UE的DCH传输的调度，减小系统的噪声增加(Noise Rise)的方差，避免系统的过载，从而提高系统的上行小区吞吐量，增大系统的业务覆盖。The present invention proposes a scheduling method applicable to the enhanced base station (Node B) control of the uplink dedicated channel (DCH) in a TDD CDMA mobile communication system. The transmission of the (DCH) is controlled, and the scheduling of the DCH transmission of the UE in the cell is implemented. Specifically, the Node B uses physical layer signaling to control the transmission format combination set (TFCS), transmission time, transmission time slot, and transmission codeword of the UE's DCH, so as to realize the scheduling of the UE's DCH transmission in the cell, reducing The variance of the noise increase (Noise Rise) of the small system avoids the overload of the system, thereby improving the throughput of the uplink cell of the system and increasing the service coverage of the system.
本发明中Node B控制的调度方法实现的基本原理是小区中的UE利用物理层信令向Node B发送调度所需的调度信息，然后Node B依据各个UE所报上来的调度信息，进行调度，确定哪些UE可以在DCH上进行业务传输，并且确定这些可进行业务传输的UE在哪些时隙、哪些码字，从什么时候开始，传输多长时间。然后Node B再利用物理层信令将这些调度指配信息传给UE。为了实现该方法，在本发明中：The basic principle of the scheduling method controlled by the Node B in the present invention is that the UE in the cell uses the physical layer signaling to send the scheduling information required for scheduling to the Node B, and then the Node B performs scheduling according to the scheduling information reported by each UE. Determine which UEs can perform service transmission on the DCH, and determine in which time slots and codewords these UEs can perform service transmission, when to start, and how long to transmit. Then the Node B transmits the scheduling assignment information to the UE by using the physical layer signaling. In order to realize this method, in the present invention:
首先，本发明给出了Node B控制的调度所需的两种物理层信令的定义。其中包括基站调度所需的信息信令的定义和基站调度指配信令的定义。在基站调度所需信息信令中，UE可以向Node B提供调度所需的信息，诸如缓存器占有状态、功率余量以及最大的功率能力。利用这些信息以及Node B本地测量的一些信息，例如在每个上行时隙中可用的噪声增加空间，Node B就可以对小区中的UE进行调度。在基站调度指配信令中，NodeB可以向UE发送调度指配，这样UE就可以知道在哪个时隙，用哪个码字，从什么时候开始，以什么样的速率，传输多长时间。First, the present invention provides definitions of two physical layer signaling required for Node B-controlled scheduling. It includes the definition of information signaling required for base station scheduling and the definition of base station scheduling assignment signaling. In the information signaling required by the base station for scheduling, the UE can provide the Node B with information required for scheduling, such as buffer occupancy status, power headroom, and maximum power capability. Using this information and some information measured locally by the Node B, such as the available noise increase space in each uplink time slot, the Node B can schedule the UEs in the cell. In base station scheduling assignment signaling, NodeB can send scheduling assignment to UE, so that UE can know which time slot, which codeword to use, when to start, at what rate, and how long to transmit.
其次，本发明给出了Node B控制的调度方法中增强后的传输信道的定义以及用于传输物理层信令的两种共享物理信道的定义。在TDD系统中，并不存在专用物理控制信道(DPCCH)，因此需要定义新的物理信道来传送调度所需的物理层信令。要传送物理层信令，可以采用时分多址(TDM)和码分多址(CDM)的方式。如果用TDM方式来传送物理层信令，那么需要在物理信道中打孔。由于所要传输的信息比特较多，在物理信道上打孔，将会严重的影响链路增益，因此TDM方式，在这里并不适用。因此在本发明中采用了CDM方式来传输物理层信令。此外，由于TDD系统码字受限，给每一个用户都分配一个专用控制信道来传输物理层信令，代价太大，因此在本发明中给出了用两种共享控制信道来传输物理层信令的方法，这两种共享信道分别为：上行增强共享信息信道(EU-SICH)和上行增强共享控制信道(EU-SCCH)。Secondly, the present invention provides the definition of the enhanced transmission channel in the scheduling method controlled by Node B and the definition of two shared physical channels used for transmitting physical layer signaling. In the TDD system, there is no Dedicated Physical Control Channel (DPCCH), so a new physical channel needs to be defined to transmit the physical layer signaling required for scheduling. To transmit physical layer signaling, time division multiple access (TDM) and code division multiple access (CDM) can be used. If TDM is used to transmit physical layer signaling, holes need to be punched in the physical channel. Since there are many information bits to be transmitted, punching holes on the physical channel will seriously affect the link gain, so the TDM method is not applicable here. Therefore, in the present invention, the CDM method is adopted to transmit the physical layer signaling. In addition, due to the limited codewords of the TDD system, each user is allocated a dedicated control channel to transmit physical layer signaling, which is too costly. Therefore, in the present invention, two shared control channels are used to transmit physical layer signaling. The two shared channels are: Enhanced Uplink Shared Information Channel (EU-SICH) and Enhanced Uplink Shared Control Channel (EU-SCCH).
第三，本发明还给出了一种避免共享信道使用中发生的碰撞问题的方法。由于共享信道是多个UE共享的，因此当某个UE在上行共享信道中传输信息时，另外一个UE可能也会使用这个共享控制信道，这样由于两个UE使用了相同的扩频码来传送各自的信息，就会造成数据丢失。因此本发明给出了避免这种共享信道使用中发生的碰撞问题的方法。Thirdly, the present invention also provides a method for avoiding the collision problem occurring in the use of the shared channel. Since the shared channel is shared by multiple UEs, when a UE transmits information on the uplink shared channel, another UE may also use this shared control channel, so that two UEs use the same spreading code to transmit The respective information will result in data loss. The present invention therefore provides a way to avoid the collision problem that occurs in the use of such shared channels.
本发明给出了上行专用信道(DCH)增强的基站(Node B)控制的调度方法，首先在发明中给出了Node B控制的调度所需的两种物理层信令的具体定义：The present invention provides the scheduling method of the base station (Node B) control that the uplink dedicated channel (DCH) enhances, at first provides the specific definition of two kinds of physical layer signaling required for the scheduling of Node B control in the invention:
●基站调度信息(NSI)，该信令是由UE传给Node B。● Base Station Scheduling Information (NSI), the signaling is transmitted from UE to Node B.
在此信令中包含的参数有：缓存器占有状态，功率余量以及最大功率能力。The parameters included in this signaling are: buffer occupancy status, power headroom and maximum power capability.
●基站调度指配(NSA)，该信令是由Node B传给UE。● Base Station Scheduling Assignment (NSA), the signaling is transmitted from Node B to UE.
此信令中包含的参数有：传输格式组合，时隙，码字，持续时间，以及开始系统帧号(对于高码率TDD系统)或开始系统子帧号(对于低码率TDD系统)。The parameters included in this signaling include: transmission format combination, time slot, codeword, duration, and start system frame number (for high code rate TDD system) or start system subframe number (for low code rate TDD system).
其次，在本发明中给出了Node B控制的调度方法中增强后的传输信道的定义以及用于传输物理层信令的两种共享物理信道的定义：Secondly, the definition of the enhanced transmission channel in the scheduling method controlled by Node B and the definition of two shared physical channels used to transmit physical layer signaling are given in the present invention:
●EU-DCH●EU-DCH
TDD系统中，对于现有专用传输信道的进行上行增强的一种新型的上行专用传输信道。In a TDD system, a new uplink dedicated transmission channel is a new type of uplink dedicated transmission channel that enhances the uplink of the existing dedicated transmission channel.
●EU-SICH●EU-SICH
TDD系统中，用于传送上行增强控制信息和调度信息的上行共享物理信道。In a TDD system, an uplink shared physical channel used to transmit uplink enhanced control information and scheduling information.
●EU-SCCH●EU-SCCH
TDD系统中，用于传送上行增强控制信息和调度指配的上行共享物理信道。In a TDD system, an uplink shared physical channel used to transmit uplink enhanced control information and scheduling assignments.
需要注意的是，在本发明中一个EU-SICH总是与一个特定的EU-SCCH相关联，也就是说这对EU-SICH和EU-SCCH的关系是预先设定的，可以用一个序号表示。另外EU-SICH与EU-SCCH间的时间关系要满足一定的条件，也就是说EU-SICH与EU-SCCH间的时间偏移要大于一定的范围，此偏移的大小主要与小区中需要调度的最大用户数和共享信道的个数有关，需要调度的用户数越多，共享信道数越少，此时间偏移越大。此外该时间偏移还与Node B的调度算法处理时间有关。It should be noted that in the present invention, an EU-SICH is always associated with a specific EU-SCCH, that is to say, the relationship between EU-SICH and EU-SCCH is preset and can be represented by a sequence number . In addition, the time relationship between EU-SICH and EU-SCCH must meet certain conditions, that is to say, the time offset between EU-SICH and EU-SCCH must be greater than a certain range. The maximum number of users is related to the number of shared channels. The more users need to be scheduled, the fewer the number of shared channels, and the larger the time offset. In addition, the time offset is also related to the processing time of the Node B's scheduling algorithm.
此外，本发明还给出了避免共享信道使用中发生的碰撞问题的方法。由于Node B知道共享信道的使用情况，如果由Node B来给UE分配共享信道的使用，那么共享信道使用的碰撞问题就可以避免。这里给出了Node B给UE分配共享信道的方法。首先，Node B在广播信道(BCH)上向小区中的UE持续广播共享信道的信息。该信息内容如表1所示。In addition, the present invention also provides a method to avoid the collision problem that occurs in the use of shared channels. Since the Node B knows the use of the shared channel, if the Node B allocates the use of the shared channel to the UE, the collision problem of the use of the shared channel can be avoided. Here is a method for the Node B to allocate a shared channel to the UE. First, the Node B continuously broadcasts the shared channel information to the UEs in the cell on the broadcast channel (BCH). The content of the information is shown in Table 1.
表1 在BCH上广播的共享信道信息内容
表中，Nusc为小区中设置的共享控制信道(EU-SICH/EU-SCCH)的数目，TSSIi为序号为i的EU-SICH所在的时隙，CSIi为序号为i的EU-SICH所用的码字，TSSCi为序号为i的EU-SCCH所在的时隙，CSCi为序号为i的EU-SCCH所用的码字，ni为序号为i的EU-SICH与EU-SCCH的帧(对于高码率TDD)或子帧(对于低码率TDD)间隔。In the table, Nusc is the number of shared control channels (EU-SICH/EU-SCCH) set in the cell, TSSIi is the time slot where the EU-SICH with the serial number i is located, CSIi is the EU-SICH with the serial number i The codeword used, TSSCi is the time slot where the EU-SCCH with the serial number i is located, CSCi is the codeword used by the EU-SCCH with the serial number i, and ni is the EU-SICH with the serial number i and the EU-SCCH Frame (for high bit rate TDD) or subframe (for low bit rate TDD) interval.
从上表中可以看出，当UE接收到上述广播信息之后，如果可以接收到Node B指配的共享信道的序号，那么UE就可以知道在哪个时隙上，用哪个码字传送自己的调度信息，然后再间隔多少帧或子帧，在哪个时隙，用哪个码字接收自己的调度指配信息了。It can be seen from the above table that after the UE receives the above broadcast information, if it can receive the sequence number of the shared channel assigned by the Node B, then the UE can know which time slot and which codeword to use to transmit its own scheduling Information, and then how many frames or subframes are separated, in which time slot, and which codeword is used to receive its own scheduling assignment information.
下面给出Node B向UE发送共享信道序号的方法，在给出该方法之前首先给出高码率TDD系统和低码率TDD系统中，发送传输格式组合指示(TFCI)的业务突发结构。其业务突发结构图分别在图1和图2中示出。The method for the Node B to send the shared channel number to the UE is given below. Before the method is given, the traffic burst structure for sending the Transport Format Combination Indication (TFCI) in the high-code rate TDD system and the low-code rate TDD system is given first. Its business burst structure diagrams are shown in Figure 1 and Figure 2 respectively.
本发明提出的传送共享信道序号的方法是：具有上行增强功能的UE，其下行至少具有两个专用物理信道(DPCH)，并且这两个DPCH都以如图1或图2中所示的突发结构类型进行业务传输。其中的一个DPCH的TFCI字段用来传输TFCI，而另外的一个DPCH的TFCI字段用来传输所指配的共享信道的序号。用这种方法来传输共享信道序号的优点是，不需要引入新的物理信道，减少了开销，此外不需要在信道上打孔，也不会影响信道传输质量。The method for transmitting the shared channel number proposed by the present invention is: a UE with an uplink enhancement function has at least two dedicated physical channels (DPCHs) in its downlink, and the two DPCHs are all in the burst mode as shown in Figure 1 or Figure 2 Send structure type for service transmission. The TFCI field of one of the DPCHs is used to transmit the TFCI, and the TFCI field of the other DPCH is used to transmit the sequence number of the assigned shared channel. The advantage of using this method to transmit the shared channel number is that there is no need to introduce a new physical channel, which reduces the overhead. In addition, there is no need to punch holes in the channel, and the channel transmission quality will not be affected.
下面给出本发明提出的上行专用信道(DCH)增强的基站(Node B)控制的调度方法的具体过程，首先给出该方法中Node B的操作过程，NodeB的操作过程流程图如图3所示。Provide the specific process of the dispatching method of the base station (Node B) control of the uplink dedicated channel (DCH) that the present invention proposes below, at first provide the operation process of Node B in this method, the operation process flowchart of Node B is as shown in Figure 3 Show.
301，流程开始。301, the process starts.
302，Node B在广播信道(BCH)上广播共享信道信息。302. The Node B broadcasts shared channel information on a broadcast channel (BCH).
303，Node B设定调度时间间隔计时器。该计时器中设定的值为调度信息上报的时间间隔。也就是说，小区中的具有上行增强功能的UE，每隔一定的时间，就要把调度信息上报给Node B，然后Node B再依据调度信息，确定是否需要对UE的DCH传输进行调度。时间间隔值的设定与调度的性能，系统信令的负担，小区中设定的共享信道个数以及小区中具有上行增强功能用户的个数有关。该时间间隔设得越小，那么调度信息的上报越频繁，这样调度信息也就越准确，因而调度性能也越好。但是间隔时间越短，系统的信令负担也越重。如果小区中设定的共享信道个数较大，而小区中的上行增强用户数较少，那么该时间间隔可以设的较小，反之，该时间间隔要设得比较大。303. The Node B sets a scheduling interval timer. The value set in the timer is a time interval for reporting scheduling information. That is to say, the UEs with the uplink enhancement function in the cell will report the scheduling information to the Node B at regular intervals, and then the Node B will determine whether to schedule the DCH transmission of the UE according to the scheduling information. The setting of the time interval value is related to the performance of scheduling, the burden of system signaling, the number of shared channels set in the cell and the number of users with uplink enhancement function in the cell. The smaller the time interval is set, the more frequently the scheduling information is reported, the more accurate the scheduling information is, and thus the better the scheduling performance is. But the shorter the interval time, the heavier the signaling burden of the system. If the number of shared channels set in the cell is large and the number of uplink enhancement users in the cell is small, then the time interval can be set relatively small, otherwise, the time interval should be set relatively large.
304，Node B将所有的共享信道的序号依次通过UE的下行DPCH传给选定的UE。假定，小区中设定的EU-SICH共有Nusc个，那么Node B将会至多选定Nusc个具有上行增强功能的UE，并将这Nusc个共享信道的序号传给这些UE。共享信道的个数Nusc的设定与系统的资源利用效率，Node B控制的调度的时延，系统中需要调度的用户数的多少有关。系统中需要调度的用户数越多，调度时延越小，那么要求的Nusc越大，但是Nusc越大，系统的可用业务信道越少，系统的资源利用效率降低。304. The Node B sequentially transmits the sequence numbers of all shared channels to the selected UE through the UE's downlink DPCH. Assuming that there are Nusc EU-SICHs configured in the cell, the Node B will select at mostNusc UEs with uplink enhancement function, and transmit the sequence numbers of theNusc shared channels to these UEs. The setting of the number Nusc of the shared channel is related to the resource utilization efficiency of the system, the scheduling delay controlled by the Node B, and the number of users to be scheduled in the system. The more users need to be scheduled in the system, and the smaller the scheduling delay, the larger the required Nusc , but the larger the Nusc , the fewer available service channels in the system, and the lower the resource utilization efficiency of the system.
305，Node B在指定的EU-SICH上接收UE发送的调度信息(NSI)。305. The Node B receives the scheduling information (NSI) sent by the UE on the specified EU-SICH.
306，判断是否所有的具有上行增强功能的UE都已经将NSI信息传给了Node B，如果否，转到304，继续选定UE，将共享信道序号传给选定的UE。如果是，则转到307。306. Determine whether all UEs with the uplink enhancement function have transmitted the NSI information to the Node B, if not, go to 304, continue to select UEs, and transmit the shared channel sequence number to the selected UEs. If yes, go to 307.
307，在所有的具有上行增强的UE都已经将NSI信息传给了Node B之后，Node B将依据这些NSI信息，做出调度指配，产生要传给需要调度的UE的Node B调度指配(NSA)。307. After all UEs with uplink enhancement have transmitted the NSI information to the Node B, the Node B will make scheduling assignments based on the NSI information, and generate Node B scheduling assignments to be transmitted to the UEs that need to be scheduled (NSA).
308，Node B将在与所指配UE上传NSI信息的EU-SICH相关联的EU-SCCH上，分别将NSA信息传给需要调度的UE。308. The Node B will respectively transmit the NSA information to the UEs that need to be scheduled on the EU-SCCH associated with the EU-SICH on which the assigned UE uploads the NSI information.
309，Node B在发送完调度指配后，就要持续监测调度间隔定时器，是否溢出。如果溢出转到310。309. After sending the scheduling assignment, the Node B will continuously monitor whether the scheduling interval timer overflows. Go to 310 if overflow.
310，判断上行DCH上传输的所有数据业务是否结束，如果否转到303，如果是转到311。310. Determine whether all data services transmitted on the uplink DCH are over, if not, go to 303, if yes, go to 311.
311，流程结束。311. The process ends.
之后，给出该方法中UE的操作过程，UE的操作过程流程图如图4所示。Afterwards, the operation process of the UE in the method is given, and the flow chart of the operation process of the UE is shown in FIG. 4 .
401，流程开始。401, the process starts.
402，UE在广播信道(BCH)上接收Node B广播的共享信道信息。402. The UE receives shared channel information broadcast by the Node B on a broadcast channel (BCH).
403，UE在每一帧(对于高码率TDD)或每一子帧(对于低码率TDD)的下行DPCH上监测是否有所指配的共享信道序号，以监测是否Node B已经给此UE分配了传输调度信息的共享信道。如果是，转到404；如果否，转到407。403. The UE monitors whether there is an assigned shared channel sequence number on the downlink DPCH of each frame (for high code rate TDD) or each subframe (for low code rate TDD), so as to monitor whether the Node B has given the UE A shared channel for transmission scheduling information is allocated. If yes, go to 404; if no, go to 407.
404，UE在共享信道序号所指定的EU-SICH上向Node B发送调度信息(NSI)。404. The UE sends scheduling information (NSI) to the Node B on the EU-SICH specified by the shared channel number.
405，UE在与所指定的EU-SCCH相关联的EU-SCCH上监测是否有Node B向其发送的调度指配信息(NSA)。如果否，转到403；如果是，转到406。405. The UE monitors on the EU-SCCH associated with the designated EU-SCCH whether there is scheduling assignment information (NSA) sent to it by the Node B. If no, go to 403; if yes, go to 406.
406，UE开始按照调度信息的指配，在指定的时隙，以指定的码字，从所指定的系统帧或系统子帧开始，以指定的持续时间开始进行业务传输。406. The UE starts to perform service transmission in a specified time slot, with a specified codeword, from a specified system frame or system subframe, and with a specified duration according to the assignment of the scheduling information.
407，判断NSA信息中指定的传输持续时间是否到时。注意：如果此时UE还没有收到过Node B调度指配，则此判断条件为否。如果是，转到408；如果否，转到409。407. Determine whether the transmission duration specified in the NSA information is expired. Note: If the UE has not received the Node B scheduling assignment at this time, the judgment condition is no. If yes, go to 408; if no, go to 409.
408，回到Node B调度前的传输状态。408. Return to the transmission state before Node B scheduling.
409，判断该UE的上行增强业务是否结束。如果是，转到410：如果否，转到403。409. Determine whether the enhanced uplink service of the UE ends. If yes, go to 410: if no, go to 403.
410，流程结束。410. The process ends.
最后给出了本发明提出的上行专用信道(DCH)增强的基站(Node B)控制的调度方法的物理层信令流程，如图5所示。Finally, the physical layer signaling flow of the uplink dedicated channel (DCH) enhanced base station (Node B) controlled scheduling method proposed by the present invention is given, as shown in FIG. 5 .
501，Node B在广播信道上广播共享信道信息。共享信道的内容如表1所示。501. The Node B broadcasts the shared channel information on the broadcast channel. The content of the shared channel is shown in Table 1.
502，Node B设定调度时间间隔计时器。502. The Node B sets a scheduling interval timer.
503，Node B在UE的一个下行DPCH上的TFCI字段上发送共享信道的序号。参数：共享信道序号。503. The Node B sends the sequence number of the shared channel in the TFCI field on a downlink DPCH of the UE. Parameter: shared channel number.
504，当UE收到共享信道的序号后，UE将在所指定的EU-SICH上发送调度信息(NSI)。参数：缓存器占有状态，功率余量和最大的功率能力。504. After the UE receives the sequence number of the shared channel, the UE sends scheduling information (NSI) on the specified EU-SICH. Parameters: buffer occupancy status, power headroom and maximum power capability.
505，Node B在收到所有UE的调度信息后，将和一些本地测量信息，如本地测量的噪声增加余量一起作为调度判决的依据，确定所要调度的UE和调度指配信息(NSA)，然后将NSA信息在与EU-SICH相关联的EU-SCCH上发送给需要进行调度的UE。参数：传输格式组合集，时隙，码字，起始系统帧号(对于高码率TDD)或起始系统子帧号(对于低码率TDD)，和持续时间。505. After receiving the scheduling information of all UEs, the Node B will use some local measurement information, such as the noise increase margin of the local measurement, as the basis for scheduling decisions, and determine the UEs to be scheduled and the scheduling assignment information (NSA), Then the NSA information is sent to the UE that needs to be scheduled on the EU-SCCH associated with the EU-SICH. Parameters: transport format combination set, time slot, codeword, starting system frame number (for high code rate TDD) or starting system subframe number (for low code rate TDD), and duration.
506，当调度时间间隔计时器到时后，重复502至505过程。506. When the scheduling time interval timer expires, repeat the process from 502 to 505.
实施例Example
本发明提出了一种适用于TDD CDMA移动通信系统中上行专用信道(DCH)增强的基站(Node B)控制的调度方法，该方法是通过Node B对小区中的用户设备(UE)的专用信道(DCH)的传输进行控制，实现对小区中UE的DCH传输的调度。为了便于理解本发明，下面给出了一个在低码率TDD(LCR-TDD)系统中Node B调度过程的实施例，其示意图如图6所示。The present invention proposes a scheduling method applicable to the enhanced base station (Node B) control of the uplink dedicated channel (DCH) in a TDD CDMA mobile communication system. The transmission of the (DCH) is controlled, and the scheduling of the DCH transmission of the UE in the cell is implemented. In order to facilitate the understanding of the present invention, an embodiment of the Node B scheduling process in a low code rate TDD (LCR-TDD) system is given below, the schematic diagram of which is shown in FIG. 6 .
假定在LCR-TDD系统中，在当前小区中设置了Nusc＝4对共享控制信道(EU-SICH/EU-SCCH)，而当前小区中共有Nu＝11个正在进行业务传输的上行增强用户。由于小区中仅有4对共享控制信道，因此在每一子帧中，最多只能有4个UE发送调度信息。那么，要传送所有上行增强用户的调度信息，至少需要的子帧数为：Assume that in the LCR-TDD system, Nusc = 4 pairs of shared control channels (EU-SICH/EU-SCCH) are set in the current cell, and there are a total of Nu = 11 uplink enhanced users who are transmitting services in the current cell . Since there are only 4 pairs of shared control channels in the cell, only 4 UEs can send scheduling information at most in each subframe. Then, to transmit the scheduling information of all uplink enhanced users, at least the number of subframes required is:
调度过程如下：The scheduling process is as follows:
第一步，Node B选定Nusc个UE，并分别在每个UE的一个下行DPCH的TFCI字段上传送给该UE指配的EU-SICH/EU-SCCH信道序号。In the first step, Node B selects Nusc UEs, and sends the EU-SICH/EU-SCCH channel number assigned to each UE in the TFCI field of a downlink DPCH of each UE.
第二步，Node B要设定调度时间间隔计时器，注意调度间隔时间要大于Nf，原因是Node B要接收到所有上行增强用户的调度信息后才能做出调度判决，此外调度间隔时间还要包括Node B的处理时间。In the second step, Node B needs to set the scheduling interval timer. Note that the scheduling interval should be greater than Nf . The reason is that Node B can only make scheduling decisions after receiving the scheduling information of all uplink enhanced users. To include the processing time of Node B.
第三步，选定的Nusc个UE分别在所指定的EU-SICH上向Node B发送自己的调度信息。In the third step, the selected Nusc UEs send their own scheduling information to the Node B on the designated EU-SICH respectively.
第四步，Node B在剩余的UE中再选出Nusc个，指配给EU-SICH，然后UE在相应的EU-SICH上发送调度信息。直到所有的上行增强UE都将调度信息发给Node B。In the fourth step, the Node B selects Nusc from the remaining UEs and assigns them to the EU-SICH, and then the UE sends scheduling information on the corresponding EU-SICH. Until all uplink enhanced UEs send scheduling information to Node B.
第五步，Node B对调度信息做处理，给出调度指配信息，在相应的EU-SCCH上给做出调度指配的UE发送调度指配信息。值得注意的是，调度信息在EU-SCCH上的发送并不要求在调度时间间隔内，也可能在下一个调度时间间隔内发送调度指配，只要EU-SCCH与EU-SICH的时序关系满足表1中的子帧间隔要求就可以了。In the fifth step, the Node B processes the scheduling information, gives the scheduling assignment information, and sends the scheduling assignment information to the UE that has made the scheduling assignment on the corresponding EU-SCCH. It is worth noting that the scheduling information is not required to be sent on the EU-SCCH within the scheduling interval, and the scheduling assignment may also be sent within the next scheduling interval, as long as the timing relationship between the EU-SCCH and the EU-SICH satisfies Table 1 The subframe interval requirements in the above are sufficient.
第六步，在调度时间间隔到时的前一子帧，重复第一步。然后在下一子帧开始重复第二至第六步。The sixth step is to repeat the first step in the subframe before the scheduled time interval expires. Then start to repeat the second to sixth steps in the next subframe.
从图6中可以看出，依据上述方法，Node B可以将共享控制信道分时地分配给具有上行增强的UE，使其能够将调度信息通过上行共享信道上报给Node B，并且不发生共享信道使用的碰撞。Node B在接收到调度信息之后，也可以通过下行共享信道将调度指配发送给UE，完成调度过程。It can be seen from Figure 6 that according to the above method, the Node B can allocate the shared control channel to the UE with uplink enhancement in a time-division manner, so that it can report the scheduling information to the Node B through the uplink shared channel, and no shared channel occurs. Collision used. After receiving the scheduling information, the Node B can also send the scheduling assignment to the UE through the downlink shared channel to complete the scheduling process.
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