技术领域technical field
本发明涉及无线通信技术，特别是涉及一种授权信息的传输方法。The invention relates to wireless communication technology, in particular to a method for transmitting authorization information.
背景技术Background technique
无线通信网络的设计受限于可用频带情况，对于已分配连续且大范围带宽的系统，可以较从容的设计各类控制信道和业务信道。但是对于可用频带离散且每一个离散的可用频带较窄的频带资源，如何合理的设计各类信道，以及如何充分的利用离散窄带资源会比宽带系统更加困难。另外，考虑到实际产品中终端的成本问题，以及系统设计的考虑，可能存在大量终端仅支持窄带范围内进行控制信道，尤其是授权信道的监听和接收。对于控制信道为了保证高的可靠性，需要在传输效率和传输质量之间进行权衡，尤其是这种离散窄带的系统，单个频点的单次传输的比特数更少。那么如果需要一次传输较多的授权信息，就很可能受限于单次传输的授权信道所能携带的比特数而无法执行。而对于离散窄带的资源分配来说，由于资源的离散化，资源的指示比宽带系统更加耗费比特数。所以需要一种能扩展授权信道可传输比特数的授权方式。The design of wireless communication networks is limited by the available frequency bands. For systems that have allocated continuous and wide-ranging bandwidth, various control channels and traffic channels can be designed more easily. However, for frequency band resources with discrete available frequency bands and each discrete available frequency band is relatively narrow, how to reasonably design various channels and how to make full use of discrete narrowband resources will be more difficult than broadband systems. In addition, considering the cost of terminals in actual products and system design considerations, there may be a large number of terminals that only support monitoring and receiving of control channels, especially licensed channels, within a narrow band range. For the control channel, in order to ensure high reliability, it is necessary to make a trade-off between transmission efficiency and transmission quality, especially for this kind of discrete narrowband system, the number of bits for a single transmission of a single frequency point is less. Then, if a large amount of authorization information needs to be transmitted at one time, it is likely to be limited by the number of bits that can be carried by the authorization channel of a single transmission and cannot be performed. For the resource allocation of discrete narrowband, due to the discretization of resources, resource indication consumes more bits than the broadband system. Therefore, there is a need for an authorization method that can expand the number of bits that can be transmitted by an authorized channel.
现有的授权方法都是在一个无线传输时间单位内下发一个，携带信息量有限，无法满足大信息量的授权下发需求。而对于宽带系统，有可能做到在一个无线传输时间单位内，在大的频带范围内同时下发多个授权，但是对于窄带系统，显然很难做到。The existing authorization methods are all issued within one wireless transmission time unit, and the amount of information carried is limited, which cannot meet the requirements of authorization issuance with a large amount of information. For broadband systems, it is possible to simultaneously issue multiple authorizations within a large frequency band within one wireless transmission time unit, but for narrowband systems, it is obviously difficult to do so.
目前尚未提出一种适用于窄带无线通信系统的授权信息的传输方法。A method for transmitting authorization information suitable for a narrowband wireless communication system has not been proposed so far.
发明内容Contents of the invention
有鉴于此，本发明的主要目的在于提供一种授权信息的传输方法，该方法适用于窄带无线通信系统。In view of this, the main purpose of the present invention is to provide a method for transmitting authorization information, which is suitable for narrowband wireless communication systems.
为了达到上述目的，本发明提出的技术方案为：In order to achieve the above object, the technical scheme proposed by the present invention is:
一种授权信息的传输方法，包括：A method for transmitting authorization information, comprising:
基站根据当前需要发送的授权信息所需要携带的比特数Mdci、当前授权单次传输所能携带的有效信息比特数W，计算发送所述授权信息需要连续传输的授权帧数N；The base station calculates the number N of authorized frames that need to be continuously transmitted to send the authorized information according to the number of bits Mdci that need to be carried in the current authorized information and the number of valid information bits W that can be carried in a single transmission of the current authorized information;
所述基站将所述授权信息所需要携带的比特分成N段，对于每段比特，将其与对应的循环校验CRC校验信息和授权分段控制单元组合在一起得到一个授权分段，并利用一个子帧将授权分段发送给终端，所述授权分段控制单元包含授权分段序号和是否是最后一授权分段的指示信息；The base station divides the bits required to be carried by the authorization information into N segments, and for each segment of bits, combines it with the corresponding cyclic check CRC check information and the authorization segment control unit to obtain an authorization segment, and Using a subframe to send the authorized segment to the terminal, the authorized segment control unit includes the authorized segment sequence number and indication information whether it is the last authorized segment;
对于接收到的每个授权分段，所述终端根据该授权分段携带的CRC校验信息进行解析，并将该授权分段的HARQ反馈信息反馈给所述基站；For each received authorized segment, the terminal parses according to the CRC check information carried in the authorized segment, and feeds back the HARQ feedback information of the authorized segment to the base station;
当所述基站接收到一授权分段的HARQ反馈信息为NACK信息时，所述基站将该授权分段重传给所述终端；When the base station receives the HARQ feedback information of a grant segment as NACK information, the base station retransmits the grant segment to the terminal;
当所述终端正确解析出所述授权信息的所述N段比特时，根据携带每段比特的授权分段中的所述授权分段控制单元，对所述N段比特重组得到所述授权信息。When the terminal correctly parses the N bits of the authorization information, according to the authorization segment control unit in the authorization segment carrying each bit, recombine the N bits to obtain the authorization information .
综上所述，本发明提出的授权信息的传输方法，将授权信息进行分段，得到多个授权分段，并以多帧连续传输的方式分别下发给终端。同时对于各授权分段采用独立的HARQ重传机制。因此，可以较快地下发信息量较大的授权，并且能避免多帧授权传输带来的可靠性损失，适用于窄带无线通信系统。To sum up, the authorization information transmission method proposed by the present invention divides the authorization information into segments, obtains multiple authorization segments, and sends them to the terminal respectively in a multi-frame continuous transmission manner. At the same time, an independent HARQ retransmission mechanism is adopted for each authorized segment. Therefore, a grant with a large amount of information can be sent quickly, and reliability loss caused by multi-frame grant transmission can be avoided, and it is suitable for a narrowband wireless communication system.
附图说明Description of drawings
图1为本发明实施例一的流程示意图。FIG. 1 is a schematic flow chart of Embodiment 1 of the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚，下面将结合附图及具体实施例对本发明作进一步地详细描述。In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
本发明的核心思想是：将授权信息进行分段，得到多个授权分段，以多帧连续传输的方式下发给终端，同时对于每个授权分段采用混合自动重传请求(HARQ)重传机制。如此，可以较快地下发信息量较大的授权，并且能避免多帧授权传输带来的可靠性损失。The core idea of the present invention is: segment the authorization information to obtain multiple authorization segments, and send them to the terminal in the form of multi-frame continuous transmission, and at the same time, use Hybrid Automatic Repeat Request (HARQ) to retransmit each authorization segment. transmission mechanism. In this way, grants with a large amount of information can be sent quickly, and reliability loss caused by multi-frame grant transmission can be avoided.
图1为本发明实施例一的流程示意图，如图1所示，该实施例主要包括：Fig. 1 is a schematic flow chart of Embodiment 1 of the present invention, as shown in Fig. 1, this embodiment mainly comprises:
步骤101、基站根据当前需要发送的授权信息所需要携带的比特数Mdci、当前授权单次传输所能携带的有效信息比特数W，计算发送所述授权信息需要连续传输的授权帧数N。Step 101, the base station calculates the number N of authorized frames that need to be continuously transmitted to send the authorized information according to the number of bits Mdci that need to be carried in the current authorized information and the number of valid information bits W that can be carried in a single transmission of the current authorized information.
具体地，可以按照N＝Mdci/W，得到所述N。Specifically, the N can be obtained according to N=Mdci /W.
在实际应用中，所述W为当前授权单次传输所能携带的比特数M与单次传输所需携带的控制信息比特数的差值。In practical applications, the W is the difference between the number M of bits that can be carried in a single current authorized transmission and the number of control information bits that need to be carried in a single transmission.
其中，所述控制信息将至少包括：单次传输授权所需要的循环校验CRC比特、授权分段序号和是否是最后一授权分段的指示信息。Wherein, the control information will at least include: the cyclic check CRC bits required for a single transmission authorization, the serial number of the authorized segment, and indication information whether it is the last authorized segment.
步骤102、所述基站将所述授权信息所需要携带的比特分成N段，对于每段比特，将其与对应的循环校验(CRC)校验信息和授权分段控制单元组合在一起得到一个授权分段，并利用一个子帧将授权分段传输给终端，所述授权分段控制单元中包含授权分段序号和是否是最后一授权分段的指示信息。Step 102, the base station divides the bits required to carry the authorization information into N segments, and for each segment of bits, combines it with the corresponding cyclic check (CRC) check information and the authorization segment control unit to obtain a Authorize the segment, and use one subframe to transmit the authorized segment to the terminal, the authorized segment control unit includes the sequence number of the authorized segment and indication information whether it is the last authorized segment.
步骤103、对于接收到的每个授权分段，所述终端根据该授权分段携带的CRC校验信息进行解析，并将该授权分段的HARQ反馈信息发送给所述基站。Step 103, for each received authorized segment, the terminal parses it according to the CRC check information carried in the authorized segment, and sends the HARQ feedback information of the authorized segment to the base station.
这里，对于接收到的每个授权分段，终端需要单独进行解析，并单独进行HARQ反馈，这样，可以只针对发生解析错误的分段进行重传。Here, for each authorized segment received, the terminal needs to analyze separately and perform HARQ feedback separately, so that retransmission can only be performed on the segment where a parsing error occurs.
步骤104、当所述基站接收到一授权分段的HARQ反馈信息为NACK信息时，所述基站将该授权分段重传给所述终端。Step 104: When the base station receives the HARQ feedback information of a grant segment as NACK information, the base station retransmits the grant segment to the terminal.
在实际应用中，当发生反馈信道检测错误时，比如基站将ACK信息检测成NACK信息，此时基站会再根据NACK信息进行对应分段的重发，这样，终端将会再次对一个已被正确接收的授权分段进行接收。较佳地，可以进一步采取丢弃最新接收的授权分段的方式，来解决上述重复接收的问题，具体如下：In practical applications, when a feedback channel detection error occurs, for example, the base station detects the ACK information as NACK information, at this time the base station will retransmit the corresponding segment according to the NACK information, so that the terminal will once again correct a The received authorization segment is received. Preferably, the method of discarding the newly received authorization segment can be further adopted to solve the above-mentioned problem of repeated reception, as follows:
如果所述终端当前接收到的授权分段与已接收到的授权分段具有相同的分段序号，并且两者携带相同的新旧授权指示位，则认为是重复接收，此时，需要将当前接收的授权分段丢弃。If the authorization segment currently received by the terminal has the same segment sequence number as the received authorization segment, and both carry the same new and old authorization indication bits, it is considered to be repeated reception. At this time, the currently received The authorized segment is discarded.
较佳地，可以设置重传次数门限，即最大重传次数，以避免由于信道质量差而进入重传死循环。具体地，当所述基站或所述终端监测到任一所述授权分段的重传次数达到预设的最大重传次数时，触发停止授权分段的重传，并删除所述终端中已正确接收的属于同一授权信息的其他授权分段。Preferably, a threshold for the number of retransmissions can be set, that is, a maximum number of retransmissions, so as to avoid entering an infinite loop of retransmissions due to poor channel quality. Specifically, when the base station or the terminal detects that the number of retransmissions of any of the authorized segments reaches a preset maximum number of retransmissions, it triggers to stop the retransmission of the authorized segments, and deletes the retransmissions of the authorized segments in the terminal. Other authorization fragments belonging to the same authorization information received correctly.
步骤105、当所述终端能够正确解析出所述授权信息的所述N段比特时，根据携带每段比特的授权分段中的所述授权分段控制单元，对所述N段比特重组得到所述授权信息。Step 105, when the terminal can correctly parse out the N bits of the authorization information, recombine the N bits according to the authorization segment control unit in the authorization segment carrying each bit to obtain The authorization information.
在实际应用中，为了进一步在信道质量较差的条件下，提高重传成功的概率，但同时考虑到正常的HARQ重传的时延，以及授权的开销，较佳的，还可以进一步在进行HARQ重传时引入冗余重传技术，即每次重传时进行多次冗余传输，以提高本次重传的成功概率，较佳的，可以采用下述方法实现这一目的：In practical applications, in order to further improve the probability of successful retransmission under the condition of poor channel quality, but at the same time taking into account the normal HARQ retransmission delay and authorization overhead, it is better to further perform Redundant retransmission technology is introduced during HARQ retransmission, that is, multiple redundant transmissions are performed for each retransmission to increase the success probability of this retransmission. Preferably, the following methods can be used to achieve this goal:
当一个所述授权分段进行第n次重传时，在本次重传中对该授权分段采用最大冗余传输次数为y+(n-1)×z的冗余传输，其中，y为预设的冗余重传的基数，z为预设的冗余次数增加步长。When one of the authorized segments is retransmitted for the nth time, the authorized segment is retransmitted with a maximum number of redundant transmissions of y+(n-1)×z redundant transmissions, where y is The base of the preset redundant retransmission, z is the step size of the preset redundant times.
这里，z为重传次数增加而导致冗余次数增加的步长参数。Here, z is a step size parameter that increases the number of redundancy due to an increase in the number of retransmissions.
所述y和z均为非负整数，具体值可由本领域技术人员根据实际需要设置。Both y and z are non-negative integers, and specific values can be set by those skilled in the art according to actual needs.
采用上述方法，对于一授权分段的每次重传，都将采用冗余传输的方式实现，并且最大冗余传输次数为y+(n-1)×z，这样，可以根据重传次数来动态调整每次HARQ重传时授权分段的最大冗余传输次数，随着重传的次数的增加，每次重传的最大冗余传输次数也将增加，如此，可以进一步提高重传的成功概率。Using the above method, each retransmission of an authorized segment will be realized by means of redundant transmission, and the maximum number of redundant transmissions is y+(n-1)×z. In this way, dynamic The maximum number of redundant transmissions of the authorized segment is adjusted for each HARQ retransmission. As the number of retransmissions increases, the maximum number of redundant transmissions of each retransmission will also increase. In this way, the success probability of retransmission can be further improved.
最简单的两个特例就是：a)z＝0，相当于每次HARQ重传都固定y次连续重复传输。B)y＝1,z＝1，相当于第1次重传传输1次，第2次重传连续重复传输2次，第3次重传连续重复传输3次……The two simplest special cases are: a) z=0, which is equivalent to fixed y consecutive repeated transmissions for each HARQ retransmission. B) y=1, z=1, which is equivalent to 1 retransmission in the 1st retransmission, 2 consecutive retransmissions in the 2nd retransmission, 3 consecutive retransmissions in the 3rd retransmission...
为了避免传输资源的浪费，对于属于同一次重传的每个冗余传输，所述终端均反馈对应的ACK/NACK信息给所述基站，当所述基站接收到一个ACK信息时，则停止对应授权分段的所述重传。In order to avoid waste of transmission resources, for each redundant transmission belonging to the same retransmission, the terminal feeds back the corresponding ACK/NACK information to the base station, and when the base station receives an ACK information, it stops corresponding The retransmission of segments is authorized.
这里，对于属于同一次HARQ重传的每个重复冗余传输，终端均反馈对应的ACK/NACK信息，这样，基站可以在终端正确接收到授权分段时及时根据ACK信息获知重传成功，从而可以及时停止对该授权分段的重传。Here, for each repeated redundant transmission belonging to the same HARQ retransmission, the terminal feeds back the corresponding ACK/NACK information, so that the base station can know the success of the retransmission according to the ACK information in time when the terminal receives the authorized segment correctly, so that The retransmission of the authorized segment can be stopped in time.
在实际应用中，由于HARQ重传之间有一定的时序间隔，多个授权分段的多次HARQ重传必然要经历一段可观的时间，有可能出现：这段时间内旧的授权还未完全传输完毕和生效，但是无线资源分配情况已发生变化，作为基站完全有能力给终端重新分配一块更优的传输资源。此时，基站就需要尽快地中止旧的授权，并用新的授权代替。这样可以在旧授权下发中途，以最快速度中止并采用新的授权进行覆盖，保证了资源分配的快速和灵活性。但是不能采用简单地下发新授权，因为新授权也有可能是分段传输，新授权的某个分段很容易被终端误认为是之前没有接收成功的旧授权的某个分段，错误的进行重组。In practical applications, since there is a certain timing interval between HARQ retransmissions, multiple HARQ retransmissions of multiple grant segments must go through a considerable period of time, and it may occur that the old grants have not been fully The transmission is completed and takes effect, but the allocation of wireless resources has changed, and the base station is fully capable of reallocating a better transmission resource to the terminal. At this time, the base station needs to suspend the old authorization as soon as possible and replace it with a new authorization. In this way, the old authorization can be terminated at the fastest speed and covered by the new authorization in the middle of the distribution, which ensures the speed and flexibility of resource allocation. However, it is not possible to simply send a new authorization, because the new authorization may also be transmitted in segments, and a segment of the new authorization is easily mistaken by the terminal as a segment of the old authorization that has not been successfully received before, and is reassembled incorrectly. .
针对该情况，可以利用授权分段携带的授权新旧指示信息指示当前的授权信息对应的各授权分段为新的授权段。具体地可以采用下述方法实现这一目的：For this situation, the authorization new and old indication information carried in the authorization segment may be used to indicate that each authorization segment corresponding to the current authorization information is a new authorization segment. Specifically, the following methods can be used to achieve this goal:
在步骤102中所述授权分段携带授权新旧指示信息；当所述授权信息为新的授权信息时，该授权信息对应的所有授权分段中的所述授权新旧指示信息为前一个授权信息对应的授权新旧指示信息的取反值。比如前一个授权信息对应的授权新旧指示信息为0，则新的为1，前一个为1，则新的为0。In step 102, the authorization segment carries authorization new and old indication information; when the authorization information is new authorization information, the authorization new and old indication information in all authorization segments corresponding to the authorization information corresponds to the previous authorization information The negated value of the old and new authorization indication information for . For example, if the old and new authorization indication information corresponding to the previous authorization information is 0, then the new one is 1; if the previous one is 1, then the new one is 0.
在步骤103中当所述终端接收到一个所述授权分段并能正确解析时，所述终端将该授权分段携带的新旧授权指示信息与自身记录的前一授权分段中的新旧授权指示信息进行比较，如果不同，则删除前一授权分段对应的授权信息的所有授权分段。In step 103, when the terminal receives an authorization segment and can parse it correctly, the terminal combines the old and new authorization indication information carried in the authorization segment with the old and new authorization indication in the previous authorization segment recorded by the terminal. information, and if they are different, delete all the authorization segments of the authorization information corresponding to the previous authorization segment.
较佳地，所述授权新旧指示信息可以由所述授权分段控制单元携带。Preferably, the authorization new and old indication information may be carried by the authorization segment control unit.
综上所述，以上仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410224803.5ACN105228137B (en) | 2014-05-26 | 2014-05-26 | A kind of transmission method of authorization message |
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| CN201410224803.5ACN105228137B (en) | 2014-05-26 | 2014-05-26 | A kind of transmission method of authorization message |
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| CN201410224803.5AExpired - Fee RelatedCN105228137B (en) | 2014-05-26 | 2014-05-26 | A kind of transmission method of authorization message |
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