CN111818653B - Resource allocation method of wireless ad hoc network - Google Patents
Resource allocation method of wireless ad hoc network Download PDFInfo
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- CN111818653B CN111818653B CN202010846001.3A CN202010846001A CN111818653B CN 111818653 B CN111818653 B CN 111818653B CN 202010846001 A CN202010846001 A CN 202010846001A CN 111818653 B CN111818653 B CN 111818653B
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- H04W72/53—Allocation or scheduling criteria for wireless resources based on regulatory allocation policies
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Abstract
The invention discloses a resource allocation method of a wireless ad hoc network, which is characterized in that a communication node transmits SIB messages and service data packets in a first type transmission time slot in an SIB message period, and transmits the service data packets in a second type transmission time slot; each SIB message is mapped on static time-frequency resources in one or more first-type transmission time slots, and physical layer control information and a service data packet transmitted each time are mapped on different physical channels on dynamic time-frequency resources in one first-type transmission time slot; for the same communication node, if the SIB message is transmitted on the static time-frequency resource in the first type transmission time slot # n, the SIB message can only be transmitted on the dynamic time-frequency resources in the transmission time slot # n + k and the following transmission time slots, and the SIB message is not changed at the data packet transmission time; the invention reduces the average transmission time delay of the wireless broadband ad hoc network and improves the transmission efficiency of the network by optimizing the time-frequency resource allocation.
Description
Technical Field
The invention relates to the technical field of ad hoc networks, in particular to a resource allocation method of a wireless ad hoc network.
Background
The wireless ad hoc network is a novel wireless network architecture completely different from a traditional wireless cellular network, and comprises a temporary autonomous network of a plurality of communication nodes. The nodes in the network are all peer-to-peer, each communication node is provided with a wireless transceiving device and has the functions of transmitting, forwarding and receiving, so that any two nodes in the network can communicate through a direct link or a multi-hop link. Compared with the traditional cellular network, the wireless ad hoc network does not need to depend on infrastructure, has the advantages of flexible and simple networking, high network reliability, large coverage range and the like, and is widely applied to the fields of public safety, military battlefields, post-disaster reconstruction, emergency tasks and the like.
With the rapid development of multimedia service demands and the mature application of broadband communication technologies represented by OFDM-MIMO (orthogonal frequency division multiple access and multiple input multiple output) technologies, wireless ad hoc networks based on the broadband communication technologies should be developed. Due to the lack of uniform technical specifications for wireless broadband ad hoc networks, some manufacturers generally adopt the existing wireless broadband communication technology to develop customized wireless ad hoc network nodes based on proprietary protocols, such as WiFi protocol and 4G LTE protocol, by modifying or referencing the communication protocol of the existing wireless broadband cellular network.
In a wireless broadband ad hoc network, each communication node needs to periodically broadcast SIB (System Information Block) Information for notifying other nodes of a System message related to configuration. Since SIB messages are periodically transmitted fixedly, the prior art typically allocates static time-frequency resources for them, i.e. each communication node allocates a fixed time-frequency resource for transmission of SIB messages in each transmission period. For the service data packet, each communication node can transmit on the dynamically allocated time-frequency resource only when a sending opportunity exists. Compared with a pure static resource allocation mode, the allocation mode increases the flexibility of the network to a certain extent.
In a common resource Multiplexing method based on TDMA (Time Division multiple Access), each communication node in an SIB message period generally allocates a Time-frequency resource of a transmission timeslot for SIB message transmission, that is, all frequency-domain resources on an operating frequency band in one transmission timeslot. For all communication nodes, a plurality of consecutive transmission slots (equal to the number of communication nodes) are allocated for SIB message transmission in one SIB message period, and the remaining transmission slots in one period are dynamic time-frequency resources for data packet transmission, as shown in fig. 1. Since each communication node corresponds to a static transmission time slot, in order to simplify the system design, only one communication node is usually allowed to transmit data packets in a dynamic transmission time slot. For the wireless ad hoc network with small network scale and small number of communication nodes, the resource proportion occupied by the static transmission time slot is small, and the influence on the throughput of the network is small. However, for a wireless ad hoc network with a large network scale and a large number of communication nodes, the static transmission timeslot occupies a large resource proportion, and all time-frequency resources are completely allocated to SIB messages under extreme conditions, resulting in very low network throughput. For example, a wireless ad hoc network including 32 communication nodes, assuming a SIB message period of 60 transmission slots, the dynamic resource that can be used for data transmission is only 24 transmission slots. As the number of communication nodes further increases, the dynamic resources for data transmission decreases accordingly.
In the prior art, a transmission slot is usually a basic unit of time domain resource division, and each transmission slot includes a plurality of minimum time domain resource units. For example, in a wireless broadband ad hoc network based on LTE (Long Term Evolution), a basic unit of time domain resources is a subframe (i.e., 1 ms), a minimum time domain resource unit is an OFDM (Orthogonal Frequency Division multiple access) symbol, and one subframe includes 14 OFDM symbols. In the transmission timeslot for data packet transmission, all time-frequency resources are divided into different transmission channels according to the technical specification, which are used for carrying transmission of different types of data packets, and mainly include a physical control channel, a physical shared channel, and the like, as shown in fig. 2.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide a resource allocation method of a wireless ad hoc network, which optimizes a time-frequency resource allocation mode of the wireless ad hoc network by dividing different types of transmission time slots, reduces the influence of the resource proportion occupied by SIB messages and the number of communication nodes on the network throughput, reduces the average transmission delay of the wireless broadband ad hoc network, improves the network throughput and improves the transmission efficiency of the network.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a resource allocation method of a wireless ad hoc network, which comprises the following steps:
the communication node transmits SIB messages and service data packets in a first type transmission time slot in an SIB message period, and transmits the service data packets in a second type transmission time slot;
the first type transmission time slot is divided into a static time frequency resource and a dynamic time frequency resource according to a minimum time domain resource unit; each SIB message is mapped on static time-frequency resources in one or more first-type transmission time slots, and physical layer control information and a service data packet transmitted each time are mapped on different physical channels on dynamic time-frequency resources in one first-type transmission time slot;
for the same communication node, if the SIB message is transmitted on the static time-frequency resource in the first type transmission slot # n, it can only perform data packet transmission on the dynamic time-frequency resources in the transmission slot # n + k and the following transmission slots, and the SIB message is not changed at the data packet transmission time, where k >0.
Preferably, one SIB message period is a time interval between consecutive SIB message transmissions, the time interval consisting of T consecutive transmission slots;
the T continuous transmission time slots comprise T1 continuously distributed first type transmission time slots and T2 continuously distributed second type transmission time slots, T1+ T2= T, T1>0, and T2 ≧ 0.
Preferably, in the first type transmission timeslot, the static time-frequency resource is used for carrying SIB messages, and the other part of the dynamic time-frequency resource is used for carrying service data packets and physical layer control information related to the transmission of the service data packets;
in the second type of transmission timeslot, all dynamic time-frequency resources are used to carry service data packets and physical layer control information related to the transmission of the service data packets.
Preferably, in the first type of transmission timeslot, one transmission timeslot includes X minimum time domain resource units, the first X1 minimum time domain resource units are static time frequency resources, and the last X-X1 minimum time domain resource units are dynamic time frequency resources, where 0-X1 is less than or equal to X/2.
Preferably, the size of the static time-frequency resource in the first type transmission time slot is determined by the period of the SIB message, the number of communication nodes, and the size of the encoded SIB message data packet;
under the condition of determining X1, if static time domain resources in a first type transmission time slot can bear an SIB message data packet after being coded, each SIB message data packet is allocated with a first type transmission time slot; otherwise, each SIB message data packet is allocated with a plurality of first type transmission time slots; wherein M × N = T1 ≦ T, where M is the number of first type transmission slots allocated per SIB message packet and N is the number of communication nodes.
The invention has the beneficial effects that:
(1) Different types of transmission time slots are combined, and static resources and dynamic resource allocation are combined, so that the flexibility of network transmission is improved;
(2) On the basis of meeting the SIB message transmission, the time-frequency resource occupation ratio of the SIB message is reduced, and the network throughput is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 illustrates a prior art resource allocation scheme;
fig. 2 illustrates physical channel division in a subframe of a wireless broadband ad hoc network based on the LTE technology in the prior art;
FIG. 3 illustrates the partitioning of different types of transmission timeslots within an SIB period according to the present invention;
FIG. 4 illustrates the partitioning of static and dynamic time-frequency resources within a first type of transmission time slot in accordance with the present invention;
FIG. 5 illustrates physical channel partitioning in a first type of transmission timeslot in accordance with the present invention;
FIG. 6 is a timing diagram illustrating SIB message transmission and data packet transmission at the same node in accordance with the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a resource allocation method of a wireless ad hoc network, which comprises the following steps:
1. the communication node transmits in the continuous transmission time slot of an SIB message period, wherein the continuous transmission time slot set of the SIB message period comprises a first type transmission time slot and a second type transmission time slot, the communication node transmits the SIB message and the service data packet in the first type transmission time slot, and only transmits the service data packet in the second type transmission time slot;
wherein, one SIB message period refers to a time interval between two consecutive SIB message transmissions, and the time interval is composed of T consecutive transmission slots; as shown in fig. 3, the T consecutive transmission timeslots include T1 consecutive transmission timeslots of the first type and T2 consecutive transmission timeslots of the second type, and T1+ T2= T, T1>0, T2 ≧ 0; from a time domain perspective, the first type of transmission slot precedes the second type of transmission slot.
In the first type of transmission timeslot, the transmission timeslot is divided into two parts according to the minimum time domain resource unit, one part is a static time frequency resource for carrying SIB messages, and the other part is a dynamic time frequency resource for carrying service data packets and physical layer control information related to the transmission of the service data packets. Suppose a transmission timeslot includes X minimum time domain resource units, the first X1 minimum time domain resource units are static time frequency resources, and the last X-X1 minimum time domain resource units are dynamic time frequency resources, where 0-restricted × 1 is not greater than X/2, as shown in fig. 4;
in the second type transmission time slot, all dynamic time frequency resources are all used for bearing service data packets and physical layer control information related to the transmission of the service data packets (only the dynamic time frequency resources in the second type); this transmission slot type is the same as the transmission slots used for dynamic time-frequency resources in the prior art.
2. Each SIB message is mapped on a static time-frequency resource in one or more first-type transmission time slots, and the size of the static time-frequency resource in the first-type transmission time slots is determined by factors such as SIB message period, the number of communication nodes, the size of an encoded SIB message data packet and the like;
in an SIB message period T (T value is not less than the number of communication nodes), all static time-frequency resources need to be able to carry SIB messages corresponding to all communication nodes, and due to the limitation of the SIB message period T, the maximum value of the first-type subframe number T1 in one period is T;
(1) The larger the value of SIB message period T is, the larger the value of first type subframe number T1 can be, and under the condition that the number of communication nodes and the size of SIB message data packet are fixed, the smaller the value of X1 in one transmission time slot can be, that is, enough static time-frequency resources can be provided to bear all SIB messages;
(2) The more the number of communication nodes is, the more SIB messages need to be transmitted, and under the condition that the SIB message period and the SIB message data packet size are fixed, if T1< T, X1 or T1 is larger; if T1= T, X1 is larger;
(3) The larger the size of the SIB message data packet is, the more SIB message bits need to be transmitted, and the larger the required static time-frequency resource is; in case that SIB message period and number of communication nodes are fixed, if T1< T, X1 or T1 is larger; if T1= T, X1 is larger;
in general, the value of X1 needs to be determined by comprehensively considering a plurality of factors such as network scale, SIB message configuration period, number of first-type transmission slots, size of SIB message data packet, and the like, so as to ensure that the provided static time-frequency resource can meet all SIB message transmission requirements; however, in the case that all static time frequency resources in one SIB period can meet all SIB message transmission requirements, X1 is preferentially added instead of T1 to provide sufficient static time frequency resources;
under the condition of determining X1, if static time domain resources in a first type transmission time slot can bear an SIB message data packet after being coded, each SIB message data packet is allocated with a first type transmission time slot; otherwise, each SIB message data packet is allocated with a plurality of first type transmission time slots; wherein M × N = T1 ≦ T, where M is the number of first type transmission slots allocated per SIB message packet, and N is the number of communication nodes.
3. In the first type of transmission time slot, the communication node transmits physical layer control information and service data packets on different physical channels on dynamic time-frequency resources, and for the different physical channels, the frequency domain resource position is unchanged, the time domain resource position is changed or the time domain resource is reduced, namely in the invention, the frequency domain resource is not changed;
in the first type of transmission timeslot, the communication node can only perform data packet transmission on the dynamic time-frequency resources in the X-X1 minimum time-domain resource units, where the dynamic time-frequency resources need to be divided into different physical channels according to technical specifications for carrying different types of data, for example, a physical control channel carries control information, and a physical shared channel carries data packets, as shown in fig. 5;
different physical channel division needs to be according to the technical specification of the wireless ad hoc network, for example, for the wireless broadband ad hoc network based on the LTE technology, in a normal transmission time slot, the physical control channel is generally mapped on the first 1-3 OFDM symbols, and the rest OFDM symbols are used for mapping the physical shared channel and other physical channels; however, in the first type of transmission slot, considering that the static time domain resource allocates the first X1 OFDM symbols, the physical control channel is mapped on X1+1 to X1+3 OFDM symbols, and the remaining X-X1-3 to X-X1-1 OFDM symbols are used for mapping the physical shared channel and other physical channels, and for the physical shared channel, the allocated OFDM symbol positions and data are changed;
in the scheme of the invention, each communication node acquires the value X1 through the configuration message and divides the physical channel through the configuration message and the technical specification.
4. For the same communication node, if the SIB message is transmitted on the static time-frequency resource in the first type transmission time slot # n, the SIB message can only be transmitted on the dynamic time-frequency resource in the transmission time slot # n + k and the subsequent transmission time slot, and the SIB message is not changed at the data packet transmission time, wherein k is greater than 0;
generally, the SIB message is used to notify some configuration messages, and only after other communication nodes learn the configuration messages, the current communication node can perform packet transmission with the other communication nodes; therefore, after the SIB message is transmitted, the current communication node can transmit the service data packet through at least k transmission slots, where the value of k depends on the time for acquiring the SIB message of the current communication node by other communication nodes, as shown in fig. 6; at the data packet transmission time, it is also ensured that the SIB message is not changed at this time, which includes two cases, the first case is that the current node does not send the SIB message again after sending the SIB message, and the second case is that the current node has sent the SIB message again, but the contents of the SIB messages are the same for two times;
the existence of a time interval between SIB message and packet transmission will lead to two special cases as follows:
(1) In the first SIB transmission period just established by the wireless ad hoc network, the dynamic time-frequency resources of the first k first type transmission time slots are idle and cannot bear service data packets;
(2) The service data packet is transmitted in the same first type transmission slot as the retransmitted SIB message.
Further, for a more clear illustration of the present invention, it is assumed that the wireless broadband ad hoc network is based on the LTE technology, a transmission slot is a subframe of 1ms, a minimum time domain resource unit is an OFDM symbol, and each subframe includes 14 OFDM symbols. In one subframe, the time-frequency resources in the first three OFDM symbols are assumed to be physical control channel regions, and the time-frequency resources in the remaining OFDM symbols are assumed to be physical shared channel regions.
The wireless broadband ad hoc network comprises 32 communication nodes, and the SIB message transmission period is 80ms; according to the invention scheme, at least 32 first type transmission slots (subframes) are contained in one SIB message period of 80ms; in a first type transmission time slot (subframe), assuming that the first X1 OFDM symbols are static time-frequency resources, and X1 is less than or equal to 7, an SIB message period contains M X32 first type transmission time slots (subframes) and 80-M X32 second type transmission time slots (subframes), and the value of M is changed along with the value of X1; when X is less than or equal to 7, if the static time-frequency resources in one first type transmission slot (subframe) are sufficient to carry the encoded SIB message data packet of one communication node, the SIB message of each communication node allocates the static time-frequency resources in one first type transmission slot (subframe), so M =1; however, when X =7, the static time-frequency resources in one first-type transmission timeslot (subframe) are not enough to carry the encoded SIB message data packet of one communication node, and then the SIB message of each communication node allocates the static time-frequency resources in M first-type transmission timeslots (subframes), so as to ensure that all allocated static time-frequency resources are enough to carry the SIB message of one communication node, where M is greater than or equal to 2; when M >2, the number of the first type transmission slots (subframes) exceeds the number of subframes in the SIB message period, and at this time, the system configuration is wrong and needs to be reconfigured.
The above content reflects the relationship between the size of the static time-frequency resource and the encoded SIB message data packet, that is, when the static time-frequency resource in one first type transmission timeslot (subframe) is not enough to carry the encoded SIB message data packet, X1=7 (maximum value) needs to be configured; in addition, the size of the static time frequency resource is also related to the period of SIB messages and the number of communication nodes; when the SIB message period is increased, if the number of communication nodes is not changed, each communication node can allocate more static time-frequency resources in the first type transmission time slot (subframe), and the size of each static time-frequency resource can be reduced, so that the total static time-frequency resources are enough; when the number of communication nodes increases, due to the limitation of the SIB message period, the static time-frequency resources in the first type transmission timeslot (subframe) that can be allocated by each communication node decreases, and the size of each static time-frequency resource needs to be increased to ensure that the total static time-frequency resources are sufficient.
In a first type of transmission slot (subframe), since the first X1 OFDM symbols are allocated as static time-frequency resources, physical control channels and physical shared channels for data packet transmission cannot be mapped on these OFDM symbols. The dynamic time frequency resources occupy 14-X1 OFDM symbols, and the time frequency resources on the OFDM symbols need to be divided into a physical control channel and a physical shared channel again. As shown in fig. 5, on the dynamic time-frequency resource, the first three OFDM symbols are divided into physical control channel regions, and the remaining OFDM symbols are divided into physical shared channel regions; compared with the physical channel division of fig. 2, the positions of the resources occupied by the physical shared channel are changed, and the number of the resources is reduced; for a second type of transmission slot (subframe), the physical channel division is as shown in fig. 2.
In the wireless broadband ad hoc network, when the network is established, all communication nodes firstly send SIB messages in a first type transmission time slot (subframe) for notifying configuration related information; for a communication node i, the communication node i is supposed to send an SIB message in a subframe # n, and after k subframes, other communication nodes in the network acquire the SIB message content sent by the communication node i; therefore, the communication node i can transmit the service data packet to other communication nodes in the network from the subframe starting from the subframe # n + k; note that no traffic packet is transmitted by the communication node within k subframes from subframe #0 to subframe # k-1.
For the communication node i, the subframe transmitting the service data packet and the subframe # n may be in the same SIB period, or may be in different SIB periods, but the SIB message from the subframe # n to the subframe transmitting the service data packet does not change; note that, the subframe in which the traffic data packet is transmitted may be a first type transmission slot (subframe) or a second type transmission slot (subframe); in the case of a first type of transmission slot (subframe), the communication node i may retransmit the SIB message in the static time-frequency resource portion and transmit the service data packet in the dynamic time-frequency resource portion.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (3)
1. A method for allocating resources of a wireless ad hoc network, comprising:
the communication node transmits SIB messages and service data packets in a first type transmission time slot in an SIB message period, and transmits the service data packets in a second type transmission time slot;
the first type transmission time slot is divided into a static time frequency resource and a dynamic time frequency resource according to a minimum time domain resource unit; each SIB message is mapped on static time-frequency resources in one or more first-type transmission time slots, and physical layer control information and a service data packet transmitted each time are mapped on different physical channels on dynamic time-frequency resources in one first-type transmission time slot;
for the same communication node, if the SIB message is transmitted on the static time-frequency resource in the first type transmission time slot # n, the SIB message can only be transmitted on the dynamic time-frequency resource in the transmission time slot # n + k and the subsequent transmission time slot, and the SIB message is not changed at the data packet transmission time, wherein k is greater than 0;
one SIB message period is a time interval between consecutive SIB message transmissions, the time interval consisting of T consecutive transmission slots;
the T continuous transmission time slots comprise T1 continuously distributed first type transmission time slots and T2 continuously distributed second type transmission time slots, T1+ T2= T, T1>0, and T2 ≧ 0;
in the first type of transmission time slot, one transmission time slot comprises X minimum time domain resource units, the first X1 minimum time domain resource units are static time frequency resources, and the last X-X1 minimum time domain resource units are dynamic time frequency resources, wherein 0-X1 is less than or equal to X/2.
2. The method of claim 1, wherein the resource allocation of the wireless ad hoc network,
in the first type transmission time slot, a static time frequency resource is used for bearing SIB information, and the other part of dynamic time frequency resource is used for bearing a service data packet and physical layer control information related to the transmission of the service data packet;
in the second type of transmission timeslot, all dynamic time-frequency resources are used to carry service data packets and physical layer control information related to the transmission of the service data packets.
3. The method of claim 1, wherein the size of the static time-frequency resource in the first-type transmission timeslot is determined by the period of the SIB message, the number of communication nodes, and the size of the SIB message packet after encoding;
under the condition of determining X1, if static time domain resources in a first type transmission time slot can bear an SIB message data packet after being coded, each SIB message data packet is allocated with a first type transmission time slot; otherwise, each SIB message data packet is allocated with a plurality of first type transmission time slots; wherein M × N = T1 ≦ T, where M is the number of first type transmission slots allocated per SIB message packet and N is the number of communication nodes.
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| CN110291828A (en) * | 2017-03-23 | 2019-09-27 | 华为技术有限公司 | The system and method for the signal transmission of resource allocation for one or more parameter sets |
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