CN103001751B - Cross-layer ARQ (Automatic Repeat Request) method in LTE-WLAN (Long Term Evolution and Wireless Local Area Network) heterogeneous wireless network system - Google Patents
Cross-layer ARQ (Automatic Repeat Request) method in LTE-WLAN (Long Term Evolution and Wireless Local Area Network) heterogeneous wireless network system Download PDFInfo
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Abstract
The invention relates to a cross-layer ARQ (Automatic Repeat Request) method in an LTE-WLAN (Long Term Evolution and Wireless Local Area Network) heterogeneous wireless network system. The cross-layer ARQ method comprises the steps of: respectively adding a virtual network interface card between a terminal of the LTE-WLAN heterogeneous wireless network system and a DLL (Data Link Layer) as well as a network layer of a gateway to virtualize a fixed IP (Internet Protocol) for an application layer at the upper side and shield influences from different physical links of a bottom layer at the lower side; and realizing an ARQ protocol on an IP layer by utilizing a closed loop feedback system. The cross-layer ARQ protocol provided by the invention solves the problems of data packet loss or disordered arrival caused by switching of the terminal in an LTE-WLAN heterogeneous wireless network environment efficiently, prevents the TCP link from entering into a congestion control state and performing a rapid recovery or slow start process to affect the link transmission performance seriously due to the loss or disorder of the data packet. The cross-layer ARQ method in the LTE-WLAN heterogeneous wireless network system, disclosed by the invention, has the advantages of well guaranteeing quality of data transmission between the terminal of the heterogeneous network system and the gateway, providing the transmission layer with reliable services and enabling a terminal user to obtain high-speed and smooth communication experience in the heterogeneous wireless network environment.
Description
Technical field
The present invention relates to the data transmission problems in heterogeneous wireless network environment, particularly relate to cross-layer HARQ (ARQ) technology ensureing data transmission quality when multimode terminal under 3GPP Long Term Evolution (LTE) and wireless lan (wlan) interconnecting system architecture switches between.
Background technology
In recent years, the Internet, communication technology fast development, the quality of the life of people progressively improves, diversified intelligent terminal starts to popularize, the demand of people to the capacity of communication network, speed, flexibility and quality is growing, and the communication network of single-mode cannot meet existing demand, many cellular network provider have started to feel very anxiety for the shortage of wireless communication resources.On the other hand, future wireless network will be its main application scenarios with indoor communications, and according to only having space transmission loss computing rule, transmission range shortens half, then power consumption becomes original 1/4, and therefore, in-door covering communication mode meets the main flow of green communications; And for high-speed mobile or outdoor communication, we also must by the covering of macro base station.Therefore, in order to improve the capacity of cordless communication network under the prerequisite of less change and lower cost, realize the high speed short distances such as microcellulor based on in-door covering or skin honeycomb simultaneously and cover interconnecting between the macrocell based on outdoor cover, the concept of heterogeneous network converged is suggested, and the access technology by multiple different mode merges and forms novel heterogeneous network.In various heterogeneous network converged technology, the fusion of WLAN (wireless local area network) (IEEE 802.11 WLAN) and Cellular Networks (GSM, GPRS, CDMA, LTE) is subject to people and pays close attention to, relative to Cellular Networks, WLAN has higher message transmission rate, but its coverage is relatively little, and generally do not support mobility, be applicable to in-door covering communication; On the other hand, compare with WLAN, the coverage of Cellular Networks is wider, support that user has mobility more flexibly, but its message transmission rate is relatively low, is applicable to high-speed mobile or outdoor communication.Therefore, if we can integrate WLAN and Cellular Networks effectively, user and cellular network provider just can make full use of the complementarity of these networks.Particularly, Cellular Networks can by holding more user with the load of WLAN shared link, simultaneously for user provides higher message transmission rate, and access network flexibly can be provided to select to user, realize the seamless combination of in-door covering communication and high-speed mobile or outdoor communication.
In LTE-WLAN heterogeneous wireless network environment, in order to make full use of each link circuit resource and offer the best data, services for user, terminal can between LTE network and wlan network switch data transmission path, the difference of two paths delay characters may cause the out of order arrival of IP packet; Terminal is in the process of toggle path, and the packet of transmission continuously can temporarily be interrupted, and therefore partial data bag may be detained in original route before handover, thus causes the loss of IP packet.And the out of order or packet loss of IP packet all can cause transmission control protocol (TCP) link to enter congestion control state, perform fast recovery or slow turn-on process, thus have a strong impact on link transmission performance.
The confirmation of ARQ agreement and retransmission mechanism can not only allow transmit leg retransmit the data of makeing mistakes when going wrong, also ensure that the submission according to the order of sequence of receiving side data simultaneously.In order to ensure the transmitting of wireless link, medium education (MAC) layer of LTE protocol applies hybrid automatic repeat-request (HARQ) agreement, wireless spread-spectrum technology (RLC) layer then applies ARQ agreement, and the data link layer of IEEE 802.11 agreement applies ARQ agreement equally.But the ARQ agreement of data link layer can not solve the problem of data-bag lost or the out of order arrival caused when terminal switches in LTE-WLAN heterogeneous wireless network environment, therefore, we need to apply cross-layer ARQ method in LTE-WLAN heterogeneous wireless network system.
Summary of the invention
Object of the present invention is in order to overcome above-mentioned prior art Problems existing, and a kind of cross-layer ARQ method in LTE-WLAN heterogeneous wireless network system is provided, the present invention can solve the problem of data-bag lost or the out of order arrival caused when multimode terminal switches in LTE-WLAN heterogeneous wireless network system effectively, thus ensures data transmission quality and systematic function.
The present invention adds Microsoft Loopback Adapter respectively in the terminal of LTE-WLAN heterogeneous wireless network system and between the data link layer of gateway and network layer, to upper be the virtual fixing IP of application layer, avoid causing IP address to change because terminal switches between the different networks, on the impact of the different physical link of lower shielding bottom; Cross-layer ARQ module is between the Microsoft Loopback Adapter and actual physics network interface card of terminal and gateway, and its realization comprises following steps:
(A) transmitting terminal
Transmitting terminal safeguards a send window, and send window moves in round-robin queue, and its length is fixed as the certain proportion of round-robin queue; In send window, the state of packet is divided into three kinds: NOT_SEND, does not namely send; SEND_NOT_RESPONSE, has namely sent but has not received confirmation; SEND_AND_RESPONSE, has namely sent and has received confirmation;
Transmitting terminal comprises three parallel handling processes: send packet, confirmation of receipt character (ACK) information, upgrade transmission state;
(1) concrete steps sending processing data packets flow process are:
(1.1) from the buffering area that Microsoft Loopback Adapter provides, read the IP packet of some, and write the round-robin queue at send window place;
(1.2) in send window, from lower edge, a reading fixed number state is NOT_SEND and is not that empty IP packet sends successively, start transmission timer simultaneously, transmission times is added one, No. SN (sequence number) of record corresponding data bag, is set to SEND_NOT_RESPONSE by its state;
(2) concrete steps receiving ACK information handling process are:
(2.1) receive ACK feedback, judge whether No. SN corresponding to ACK information drops in send window, if not, then return; If so, the relative position of this ACK in send window is then obtained;
(2.2) according to the position of ACK at send window, the state upgrading the correct packet received in send window is SEND_AND_RESPONSE, and the packet that can correctly not receive then is arranged to NOT_SEND, prepares to retransmit;
(2.3) send window lower edge is moved to first state not on the packet of SEND_AND_RESPONSE, upgrade the number having sent packet simultaneously;
(3) upgrading the concrete steps sending state processing flow process is:
(3.1) state in send window of checking is the transmission timer and transmission times that the packet of SEND_NOT_RESPONSE is corresponding, if timer expiry, then the state of this packet is set to NOT_SEND; If transmission times exceedes maximum retransmission, then the state of this packet is set to SEND_AND_RESPONSE;
(B) receiving terminal
Receiving terminal safeguards a receive window, and receive window moves in round-robin queue, and its length is fixed as the certain proportion of round-robin queue.In addition, receiving terminal also will safeguard that confirms a waiting list, this queue comprises several record nodes, and each record nodes records one of queue has correctly received or detected that the sequence number of losing the packet be identified that still also do not have enough time arrives or find the timestamp lost with this packet.This queue is the time sequencing arrangement correctly receiving according to packet sequence number or find to lose, and correctly receives or detect the foremost being recorded in queue of packet of loss at first.Data receiver detects the packet whether having loss when correctly receiving packet at every turn, if there is frame losing, the sequence number of one or more packet lost and current time stamp are inserted into confirmation waiting list, then the packet sequence number correctly received and current time stamp are inserted into confirmation waiting list; Otherwise directly the packet sequence number correctly received and current time stamp are inserted into confirmation waiting list.
The ACK information frame format of receiving terminal feedback is as shown in table 1:
Table 1 is ACK information frame format
| Bitmap types | No. SN | Bitmap |
ACK frame adopts accumulation to confirm, and bitmap and non-accumulated confirm bitmap two kinds of forms.When the confirmation type of ACK is accumulation acknowledgement bit graph type, Bit 1 represents to sequence number the confirmation of the reception condition being SN+1 packet, if be 1, represents the received upright really reception of this packet, i.e. positive acknowledgement; If be 0, represent and correctly do not receive, be i.e. Negative Acknowledgement.Bit 2 represents the confirmation of the reception condition of the packet to sequence number SN+2, and in like manner Bit 3 arrives Bit N bit representation to the confirmation of the receives data packets situation of sequence number from SN+3 to SN+N.Accumulation acknowledgement bit graph type always to the packet Negative Acknowledgement of SN, to the packet positive acknowledgement before SN; When the confirmation type of ACK is non-accumulated acknowledgement bit graph type, Bit 1 represents to sequence number the confirmation of the reception condition being SN packet, if be 1, represents the received upright really reception of this packet, i.e. positive acknowledgement; If be 0, represent and correctly do not receive, be i.e. Negative Acknowledgement.Bit2 represents the confirmation of the reception condition of the packet to sequence number SN+1, and in like manner Bit 3 is to the confirmation of the receives data packets situation of Bit N bit representation sequence number from SN+2 to SN+N-1.Non-accumulated acknowledgement bit graph type neither does positive acknowledgement to the packet before SN, does not also do Negative Acknowledgement.
Receiving terminal comprises three parallel handling processes: receive packet, structure and send ACK frame, safeguard ACK confirm waiting list.
(1) concrete steps receiving processing data packets flow process are:
(1.1) what judge to receive whether No. SN of packet drop on receive window can in range of receiving.If so, then by window reception; If not, then return;
(1.2) No. SN of reception packet record and the receiveNumHighEdge whether being greater than last packet correctly received of receive window is judged; If so, step (1.3) is then proceeded to; If not, then directly proceed to step (1.4);
(1.3) upgrade receiveNumHighEdge, and joined by the receiving record between former receiveNumHighEdge and new receiveNumHighEdge in ACK confirmation waiting list, the order of insertion follows the process of No. SN circulation rising.These packets are temporarily regarded as the correct packet received, and be these packets interpolation timestamp;
(1.4) if receive packet also do not insert ACK confirmation waiting list, then the packet data recording received is inserted ACK and confirm in waiting list;
(1.5) upgrade receive window lower edge, namely find first can correctly not receive after packet and No. SN that waits for not overtime packet receiving, upgrade receive window lower edge with this No. SN;
(1.6) packet will correctly received, namely the former lower edge of receive window is recorded to the packet of new lower edge record, removes window, gives the process of upper-level virtual network interface card, and confirms to delete corresponding record waiting list from ACK;
(2) to construct and the concrete steps sending ACK frame handling process are:
(2.1) judge that ACK confirms whether waiting list is empty; If it is empty, then No. SN is got from the lower edge of receiver window; If not empty, then confirm to get No. SN first element of waiting list from ACK;
(2.2) whether determining step (2.1) No. SN of obtaining drops in receive window; If so, then using this No. SN as ACK frame No. SN; If not, then force No. SN using window lower edge as ACK frame;
(2.3) relation of determining step (2.2) No. SN of obtaining and receive window lower edge.If identical, then adopt accumulation bitmap ACK pattern; If different, then adopt non-accumulated bitmap ACK pattern.According to mistake or the correct accepting state selection ACK type of bag;
(2.4) according to the ACK type structure ACK frame selected;
(2.5) comprised in confirmation No. SN is confirmed to delete waiting list from ACK;
(2.6) ACK frame is sent;
(3) safeguard that ACK confirms that the concrete steps of waiting list handling process are:
(3.1) all wait acknowledge time before confirmation waiting list is greater than the record knot removal abandoning acknowledging time thresholding, namely abandon being greater than to the wait acknowledge time packet abandoning acknowledging time thresholding to confirm, wherein abandon acknowledging time thresholding and equal to send the time-out time of overtime timer and deduct send ACK receives this ACK completely processing time to data receiver from data receiver.
Send window length, receive window length are respectively 1/2 of round-robin queue.
Technique effect of the present invention is embodied in:
By feedback and retransmission mechanism, reduce the probability causing data-bag lost because terminal carries out switching between LTE and WLAN link;
By sliding window mechanism, avoid the problem of the data packet disorder arrival caused because terminal carries out switching between LTE and WLAN link, ensure that IP packet is submitted to transport layer according to the order of sequence;
Realize ARQ agreement in IP aspect, for transport layer provides reliability services, effectively reduce TCP and enter slow turn-on or the fast probability recovered, ensure that data transmission efficiency and network throughput;
Adopt efficient affirmation mode, reduce the bandwidth resources shared by confirmation as far as possible, under the prerequisite not affecting network throughput, ensure that the data transmission quality in LTE-WLAN heterogeneous wireless network system.
Accompanying drawing explanation
Fig. 1 is LTE-WLAN heterogeneous wireless network system architecture schematic diagram;
Fig. 2 is each nodal function module diagram in LTE-WLAN heterogeneous wireless network system;
Fig. 3 is cross-layer ARQ module diagram in LTE-WLAN heterogeneous wireless network system;
Fig. 4 is send window schematic diagram in cross-layer ARQ module;
Fig. 5 a is the handling process schematic diagram that cross-layer ARQ module transmitting terminal sends packet;
Fig. 5 b is the handling process schematic diagram that cross-layer ARQ module transmitting terminal receives ACK feedback information;
Fig. 5 c is the handling process schematic diagram that cross-layer ARQ module transmitting terminal upgrades transmission state;
Fig. 6 is receive window schematic diagram in cross-layer ARQ module;
Fig. 7 a is the handling process schematic diagram that cross-layer ARQ module receiving terminal receives packet;
Fig. 7 b is that cross-layer ARQ module receiving terminal constructs and sends the handling process schematic diagram of ACK feedback information;
Fig. 7 c is that cross-layer ARQ module receiving terminal safeguards that ACK confirms the handling process schematic diagram of waiting list.
Embodiment
Be described in detail to invention below in conjunction with accompanying drawing, but following examples are only illustrative, protection scope of the present invention is not by the restriction of these embodiments.
Fig. 1 is the overall architecture of LTE-WLAN heterogeneous wireless network system, and system comprises two multimode terminals, a Linux gateway and a LTE link and two WLAN links.The functional module that in system, each node comprises as shown in Figure 2, gateway and terminal are all self-defined realizes Microsoft Loopback Adapter and cross-layer ARQ agreement, in addition, gateway is self-defined realizing route selection, network address conversion module also, and the self-defined realizing route of end selects module.The position of cross-layer ARQ protocol module in LTE-WLAN heterogeneous wireless network system as shown in Figure 3, at transmitting terminal, ARQ module be input as buffering area A, export as buffering area C, in buffering area, save the pointer of IP packet.Microsoft Loopback Adapter writes IP packet to buffering area A, ARQ process reads these IP packets from the A of buffering area, write buffering area C again after sealing up No. SN, the physical network card of WLAN and LTE sends process read data packet from the C of buffering area again, completes and give out a contract for a project after adding respective protocol head; At receiving terminal, ARQ module be input as buffering area D, export as buffering area B, in buffering area, save the pointer of IP packet.ARQ process reads physical network card and catches the IP packet come from the D of buffering area, after whole sequence, feedback processing, the packet correctly received is write buffering area B according to the order of sequence, and Microsoft Loopback Adapter receiving process reads in through the IP packet of whole sequence from the B of buffering area, gives upper-layer protocol stack and processes.
The realization of cross-layer ARQ agreement is mainly divided into transmitting terminal and receiving terminal two parts:
Transmitting terminal maintains a send window, and as shown in Figure 4, send window moves in round-robin queue, and its length is 1/2 of round-robin queue.Wherein sendLowEdge points to send window lower edge, indicates first to send and does not correctly receive the packet of (SEND_NOT_RESPONSE), the packet that sendNumHighEdge indicates last to send.
Transmitting terminal processing data packets flow process, as shown in Fig. 5 a, Fig. 5 b, Fig. 5 c, mainly comprises three parallel processes: send packet, receive ACK feedback information, upgrade transmission state.
(1) concrete steps sending processing data packets flow process are:
(1.1) from the buffering area that Microsoft Loopback Adapter provides (i.e. buffering area A), read the IP packet of some, and write the round-robin queue at send window place, until transmitting terminal round-robin queue is filled or buffering area A stops for empty;
(1.2) in send window, from lower edge, a reading fixed number state is NOT_SEND and is not that empty IP packet sends successively, start transmission timer simultaneously, transmission times is added one, No. SN that records corresponding data bag, its state is set to SEND_NOT_RESPONSE;
(2) concrete steps receiving ACK feedback information handling process are:
(2.1) receive ACK feedback, judge whether No. SN corresponding to ACK information drops in send window, if not, then return; If so, the relative position of this ACK in send window is then obtained;
(2.2) according to the position of ACK at send window, the state upgrading the correct packet received in send window is SEND_AND_RESPONSE, and the packet that can correctly not receive then is arranged to NOT_SEND, prepares to retransmit;
(2.3) send window lower edge (sendLowEdge) is moved to first state not on the packet of SEND_AND_RESPONSE, upgrade the number having sent packet, i.e. the value of sendNumHighEdge – sendLowEdge simultaneously.
(3) upgrading the concrete steps sending state processing flow process is:
(3.1) effect that this step is main be to trigger Retransmission timeout and abandon retransmitting the packet exceeding maximum retransmission.The state in send window of checking is the transmission timer and transmission times that the packet of SEND_NOT_RESPONSE is corresponding, if transmission timer is overtime, then the state of this packet is set to NOT_SEND; If transmission times exceedes maximum retransmission, then the state of this packet is set to SEND_AND_RESPONSE.Time-out time should be arranged to slightly be greater than maximum link round-trip delay, and transmitting terminal transmission processing time and receiving terminal ACK construct time delay sum.
Receiving terminal maintains a receive window, and as shown in Figure 6, receive window moves in round-robin queue, and its length equals 1/2 of round-robin queue.ReceiveLowEdge is receive window lower edge, indicates first packet that can correctly not receive, and receiveNumHighEdge indicates last packet correctly received.
Receiving terminal processing data packets flow process, as shown in Fig. 7 a, Fig. 7 b, Fig. 7 c, mainly comprises three parallel processes: receive packet, structure send ACK feedback information, safeguard that ACK confirms waiting list.
(1) concrete steps receiving processing data packets flow process are:
(1.1) what judge to receive whether No. SN of packet drop on receive window can in range of receiving.If so, then by window reception; If not, then return;
(1.2) No. SN of the reception packet record (i.e. receiveNumHighEdge) whether being greater than last packet correctly received of receive window is judged.If so, step (1.3) is then proceeded to; If not, then directly proceed to step (1.4);
(1.3) upgrade receiveNumHighEdge, and joined by the receiving record between former receiveNumHighEdge and new receiveNumHighEdge in ACK confirmation waiting list, the order of insertion follows the process of No. SN circulation rising.These packets are temporarily regarded as the correct packet received, and be these packets interpolation timestamp.When these packets are after have passed through Retransmission timeout time * Retransmission timeout number of times, still do not have correctly to receive, just can force movably receiving window according to this timestamp;
(1.4) if receive packet also do not insert ACK confirmation waiting list, then the packet received is inserted ACK and confirm in waiting list;
(1.5) upgrade receive window lower edge, namely find first can correctly not receive after packet and No. SN that waits for not overtime packet receiving, upgrade receiveLowEdge with this No. SN;
(1.6) packet will correctly received, namely former receiveLowEdge is to the packet of new receiveLowEdge-1, removes window, gives the process of upper-level virtual network interface card, and confirms to delete corresponding record waiting list from ACK;
(2) to construct and the concrete steps sending ACK frame handling process are:
(2.1) judge that ACK confirms whether waiting list is empty.If it is empty, then No. SN is got from the lower edge of receiver window; If not empty, then confirm to get No. SN first element of waiting list from ACK;
(2.2) whether determining step (2.1) No. SN of obtaining drops in receive window.If so, then using this No. SN as ACK frame No. SN; If not, then force No. SN using window lower edge as ACK frame;
(2.3) relation of determining step (2.2) No. SN of obtaining and receive window lower edge.If identical, then adopt accumulation bitmap ACK pattern; If different, then adopt non-accumulated bitmap ACK pattern.According to mistake or the correct accepting state selection ACK type of bag;
(2.4) according to the ACK type structure ACK frame selected;
(2.5) comprised in confirmation No. SN is confirmed to delete waiting list from ACK;
(2.6) ACK frame is sent;
(3) safeguard that ACK confirms that the concrete steps of waiting list handling process are:
(3.1) the maximum wait acknowledging time confirming waiting list is calculated, if what maximum wait acknowledging time was greater than setting abandons acknowledging time thresholding, then all wait acknowledge time before confirmation waiting list is greater than the record knot removal abandoning acknowledging time thresholding, namely abandon being greater than to the wait acknowledge time packet abandoning acknowledging time thresholding to confirm (abandoning confirming strategy), wherein abandon acknowledging time thresholding to equal to send the time-out time of overtime timer and deduct send ACK receives this ACK completely processing time to data receiver from data receiver.
Abandon confirming that the effect of strategy abandons sending confirmation to the packet that the stand-by period in confirming to wait for exceedes thresholding, Retransmission timeout is carried out by transmission timeout mechanism, such sub-fraction packet is processed by Retransmission timeout mechanism, most data packets is still retransmitted by Negative Acknowledgement mechanism, confirms bandwidth not waste.
Claims (1)
1. the cross-layer ARQ method in a LTE-WLAN heterogeneous wireless network system, cross-layer ARQ module is between the Microsoft Loopback Adapter and actual physics network interface card of terminal and gateway, it is characterized in that: between the data link layer and network layer of terminal and gateway, add Microsoft Loopback Adapter respectively, to upper be the virtual fixing IP of application layer, on the impact of the different physical link of lower shielding bottom; Its realization comprises following steps:
(A) transmitting terminal
Transmitting terminal safeguards a send window, and send window moves in round-robin queue, and its length is fixed as 1/2 of round-robin queue; In send window, the state of packet is divided into three kinds: NOT_SEND, does not namely send; SEND_NOT_RESPONSE, has namely sent but has not received confirmation; SEND_AND_RESPONSE, has namely sent and has received confirmation;
Transmitting terminal comprises transmission packet, confirmation of receipt character (ACK) information, upgrades the parallel handling process of transmission state three;
(B) receiving terminal
Receiving terminal safeguards a receive window, and receive window moves in round-robin queue, and its length is fixed as 1/2 of round-robin queue; In addition, receiving terminal also will safeguard that confirms a waiting list, confirm that waiting list comprises several record nodes, each record nodes records one of confirmation waiting list has correctly received or has detected the sequence number of losing the packet be identified that still also do not have enough time and the timestamp that this packet arrives or discovery is lost; This confirmation waiting list is the time sequencing arrangement correctly receiving according to packet sequence number or find to lose, and correctly receives or detect the foremost being recorded in queue of packet of loss at first; Data receiver detects the packet whether having loss when correctly receiving packet at every turn, if there is frame losing, the sequence number of one or more packet lost and current time stamp are inserted into confirmation waiting list, then the packet sequence number correctly received and current time stamp are inserted into confirmation waiting list; Otherwise directly the packet sequence number correctly received and current time stamp are inserted into confirmation waiting list; The ACK information frame format of receiving terminal feedback comprises: bitmap types, No. SN and bitmap;
Receiving terminal comprises three parallel handling processes: receive packet, structure and send ACK frame, safeguard ACK confirm waiting list.
2. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network system according to claim 1, is characterized in that: the concrete steps of the transmission processing data packets flow process of described transmitting terminal are:
(1.1) from the buffering area that Microsoft Loopback Adapter provides, read the IP packet of some, and write the round-robin queue at send window place;
(1.2) in send window, from lower edge, a reading fixed number state is NOT_SEND and is not that empty IP packet sends successively, start transmission timer simultaneously, transmission times is added one, No. SN that records corresponding data bag, its state is set to SEND_NOT_RESPONSE.
3. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network system according to claim 1, is characterized in that: the concrete steps of the reception ACK information handling process of described transmitting terminal are:
(2.1) receive ACK feedback, judge whether No. SN corresponding to ACK information drops in send window, if not, then return; If so, the relative position of this ACK in send window is then obtained;
(2.2) according to the position of ACK at send window, the state upgrading the correct packet received in send window is SEND_AND_RESPONSE, and the packet that can correctly not receive then is arranged to NOT_SEND, prepares to retransmit;
(2.3) send window lower edge is moved to first state not on the packet of SEND_AND_RESPONSE, upgrade the number having sent packet simultaneously.
4. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network system according to claim 1, is characterized in that: the concrete steps of the renewal transmission state processing flow process of described transmitting terminal are:
The state in send window of checking is the transmission timer and transmission times that the packet of SEND_NOT_RESPONSE is corresponding, if timer expiry, then the state of this packet is set to NOT_SEND; If transmission times exceedes maximum retransmission, then the state of this packet is set to SEND_AND_RESPONSE.
5. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network system according to claim 1, is characterized in that: the ACK frame of described receiving terminal adopts accumulation to confirm bitmap and non-accumulated confirmation bitmap two kinds of forms; When the confirmation type of ACK is accumulation acknowledgement bit graph type, Bit 1 represents to sequence number the confirmation of the reception condition being SN+1 packet, if be 1, represents the received upright really reception of this packet, i.e. positive acknowledgement; If be 0, represent and correctly do not receive, be i.e. Negative Acknowledgement; Bit 2 represents the confirmation of the reception condition of the packet to sequence number SN+2, and in like manner Bit 3 arrives Bit N bit representation to the confirmation of the receives data packets situation of sequence number from SN+3 to SN+N; Accumulation acknowledgement bit graph type always to the packet Negative Acknowledgement of SN, to the packet positive acknowledgement before SN; When the confirmation type of ACK is non-accumulated acknowledgement bit graph type, Bit 1 represents to sequence number the confirmation of the reception condition being SN packet, if be 1, represents the received upright really reception of this packet, i.e. positive acknowledgement; If be 0, represent and correctly do not receive, be i.e. Negative Acknowledgement; Bit2 represents the confirmation of the reception condition of the packet to sequence number SN+1, and in like manner Bit 3 is to the confirmation of the receives data packets situation of Bit N bit representation sequence number from SN+2 to SN+N-1; Non-accumulated acknowledgement bit graph type neither does positive acknowledgement to the packet before SN, does not also do Negative Acknowledgement.
6. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network system according to claim 1, is characterized in that: the concrete steps of the reception processing data packets flow process of described receiving terminal are:
(1.1) what judge to receive whether No. SN of packet drop on receive window can in range of receiving, if so, then by window reception; If not, then return;
(1.2) No. SN of reception packet record and the receiveNumHighEdge whether being greater than last packet correctly received of receive window is judged; If so, step (1.3) is then proceeded to; If not, then directly proceed to step (1.4);
(1.3) receiveNumHighEdge is upgraded, and the receiving record between former receiveNumHighEdge and new receiveNumHighEdge is joined ACK to be confirmed in waiting list, the order inserted follows the process that No. SN circulation is risen, these packets are temporarily regarded as the correct packet received, and be these packets interpolation timestamp;
(1.4) if receive packet also do not insert ACK confirmation waiting list, then the packet data recording received is inserted ACK and confirm in waiting list;
(1.5) upgrade receive window lower edge, namely find first can correctly not receive after packet and No. SN that waits for not overtime packet receiving, upgrade receive window lower edge with this No. SN;
(1.6) packet will correctly received, namely the former lower edge of receive window is recorded to the packet of new lower edge record, removes window, gives the process of upper-level virtual network interface card, and confirms to delete corresponding record waiting list from ACK.
7. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network system according to claim 1, is characterized in that: the structure of described receiving terminal the concrete steps sending ACK frame handling process are:
(2.1) judge that ACK confirms whether waiting list is empty; If it is empty, then No. SN is got from the lower edge of receiver window; If not empty, then confirm to get No. SN first element of waiting list from ACK;
(2.2) whether determining step (2.1) No. SN of obtaining drops in receive window; If so, then using this No. SN as ACK frame No. SN; If not, then force No. SN using window lower edge as ACK frame;
(2.3) relation of determining step (2.2) No. SN of obtaining and receive window lower edge; If identical, then adopt accumulation bitmap ACK pattern; If different, then adopt non-accumulated bitmap ACK pattern, according to mistake or the correct accepting state selection ACK type of bag;
(2.4) according to the ACK type structure ACK frame selected;
(2.5) comprised in confirmation No. SN is confirmed to delete waiting list from ACK;
(2.6) ACK frame is sent.
8. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network system according to claim 1, is characterized in that: the maintenance ACK of described receiving terminal confirms that the concrete steps of waiting list handling process are:
All wait acknowledge time before confirmation waiting list is greater than the record knot removal abandoning acknowledging time thresholding, namely abandon being greater than to the wait acknowledge time packet abandoning acknowledging time thresholding to confirm, wherein abandon acknowledging time thresholding and equal to send the time-out time of overtime timer and deduct send ACK receives this ACK completely processing time to data receiver from data receiver.
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| Application Number | Priority Date | Filing Date | Title |
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| DE112013007142T5 (en) * | 2013-06-07 | 2016-04-14 | Apple Inc. | Managing pending acknowledgment packets in a communication device |
| WO2016161594A1 (en) * | 2015-04-09 | 2016-10-13 | 华为技术有限公司 | Data transmission method and apparatus |
| CN107736051A (en) * | 2015-08-13 | 2018-02-23 | 华为技术有限公司 | Data transmission method, base station and user equipment |
| CN106657197B (en) * | 2015-11-02 | 2021-10-15 | 腾讯科技（深圳）有限公司 | File uploading method and device |
| CN105376821B (en) * | 2015-11-16 | 2018-12-14 | 浪潮电子信息产业股份有限公司 | Vertical switching method of wireless heterogeneous network |
| CN106850125B (en) * | 2015-12-03 | 2019-11-08 | 上海无线通信研究中心 | MAC layer data packet retransmission mechanism optimization method towards Cellular Networks and WLAN combination network |
| CN105722152A (en) * | 2016-02-25 | 2016-06-29 | 华中科技大学 | Heterogeneous network data parallel transmission system and method |
| CN105873097B (en) * | 2016-03-28 | 2019-06-11 | 努比亚技术有限公司 | Terminal device and data transfer control method |
| RU2718239C1 (en) * | 2016-11-11 | 2020-03-31 | Бейдзин Сяоми Мобайл Софтвэр Ко., Лтд. | Method and device for configuring transmission speed |
| CN107295119B (en) * | 2017-06-30 | 2020-10-30 | 重庆小目科技有限责任公司 | Information acquisition system and method based on heterogeneous network |
| CN109587749B (en) * | 2018-12-24 | 2021-04-20 | 深圳市闻耀电子科技有限公司 | Data sending method and system |
| CN114008952A (en) | 2019-09-23 | 2022-02-01 | Oppo广东移动通信有限公司 | Window adjusting method and device, network equipment and terminal equipment |
| CN111008092A (en) * | 2019-12-12 | 2020-04-14 | 上海沪工焊接集团股份有限公司 | Welding machine communication management method and welding machine |
| CN111130712B (en) * | 2019-12-30 | 2020-11-24 | 华中科技大学 | Self-adaptive cross-carrier hybrid automatic repeat request processing method and application |
| CN111901075B (en) * | 2020-07-16 | 2021-11-23 | 华中科技大学 | Multi-network convergence transmission method, transmission system and computer-readable storage medium |
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