CN103001751A - 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 the heterogeneous wireless network environment, relate in particular to cross-layer HARQ (ARQ) technology that guarantees data transmission quality when under 3GPP Long Term Evolution (LTE) and wireless lan (wlan) interconnected systems framework, the multimode terminal between switches.
Background technology
In recent years, the Internet, communication technology fast development, people's quality of the life progressively improves, diversified intelligent terminal begins to popularize, people are growing to the demand of capacity, speed, flexibility and the quality of communication network, and the communication network of single-mode can't satisfy existing demand, and many cellular network provider begin to feel very anxiety for the shortage of wireless communication resources.On the other hand, future wireless network will be that according to only having the space transmission loss computing rule, transmission range shortens half take indoor communications as its main application scenarios, and power consumption becomes originally 1/4, and therefore, indoor covering communication mode meets the main flow of green communications; And for high-speed mobile or outdoor communication, we also must be 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 low cost, realize simultaneously with indoor be covered as the high speed short distances such as main microcellulor or skin honeycomb cover with take outdoor cover as interconnecting between the macrocell of leading, the concept of heterogeneous network converged is suggested, and the access technology that is about to 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, with respect to Cellular Networks, WLAN has higher message transmission rate, but its coverage less, and generally do not support mobility, be applicable to indoor covering communication; On the other hand, compare with WLAN, the coverage of Cellular Networks is wider, support that the 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, just user and cellular network provider can take full advantage of the complementarity of these networks.Particularly, Cellular Networks can by with the WLAN shared link load hold more user, simultaneously for the user provides higher message transmission rate, and can provide flexibly access network to select to the user, realize the seamless combination of indoor covering communication and high-speed mobile or outdoor communication.
In LTE-WLAN heterogeneous wireless network environment, in order to take full advantage of each link circuit resource and to be user's data, services that offers the best, terminal can be between LTE network and wlan network the 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 can temporarily be interrupted continuously, and therefore the partial data bag may be trapped in and switch in original route before, thereby 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 the congestion control state, carries out fast the recovery or slow start-up course, thereby has a strong impact on link transmission performance.
The confirmation of ARQ agreement and retransmission mechanism not only can allow transmit leg retransmit the data of makeing mistakes when going wrong, and have also guaranteed the submission according to the order of sequence of receiving side data simultaneously.In order to guarantee the transmitting of Radio Link, media access control (MAC) layer of LTE agreement has been used mixed automatic retransfer request (HARQ) agreement, Radio Link is controlled (RLC) layer and has been used the ARQ agreement, and the data link layer of IEEE 802.11 agreements has been used the ARQ agreement equally.But the ARQ agreement of data link layer can not solve the data-bag lost that causes when terminal is switched or the problem of out of order arrival in LTE-WLAN heterogeneous wireless network environment, therefore, we need to use cross-layer ARQ method in LTE-WLAN heterogeneous wireless network system.
Summary of the invention
The problem that purpose of the present invention exists in order to overcome above-mentioned prior art, and provide cross-layer ARQ method in a kind of LTE-WLAN heterogeneous wireless network system, the present invention can solve the data-bag lost that causes when multimode terminal switches or the problem of out of order arrival effectively in LTE-WLAN heterogeneous wireless network system, thereby guarantees data transmission quality and systematic function.
The present invention adds respectively Microsoft Loopback Adapter between the data link layer of the terminal of LTE-WLAN heterogeneous wireless network system and gateway and network layer, to upper be the virtual fixing IP of application layer, avoid switching between heterogeneous networks because of terminal and cause the IP address to change, on the impact of the different physical links 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 is safeguarded 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 the transmission state;
(1) concrete steps of transmission processing data packets flow process are:
(1.1) read the IP packet of some from the buffering area that Microsoft Loopback Adapter provides, and write the round-robin queue at send window place;
(1.2) in send window, from the lower edge, read successively a fixed number state and be NOT_SEND and do not send for empty IP packet, start simultaneously transmission timer, transmission times is added one, record No. SN (sequence number) of corresponding data bag, its state is set to SEND_NOT_RESPONSE;
(2) concrete steps of reception ACK message processing flow are:
(2.1) receive the ACK feedback, judge whether ACK information drops in send window for corresponding No. SN, if not, return; If obtain the relative position of this ACK in send window;
(2.2) according to the position of ACK at send window, the state that upgrades the correct packet that receives in send window is SEND_AND_RESPONSE, and the packet that can correctly not receive is arranged to NOT_SEND, prepares to retransmit;
(2.3) the send window lower edge is moved to first state on the packet of SEND_AND_RESPONSE, upgrade simultaneously the number that has sent packet;
(3) upgrading the concrete steps that send the state processing flow process is:
(3.1) check that in send window, state is corresponding transmission timer and the transmission times of packet of SEND_NOT_RESPONSE, if timer expiry, the state with this packet is set to NOT_SEND; If transmission times surpasses maximum retransmission, the state with this packet is set to SEND_AND_RESPONSE;
(B) receiving terminal
Receiving terminal is safeguarded 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 will safeguard that is also confirmed a waiting list, this formation comprises that several record node, and but each of formation records one of nodes records and correctly received or detected the sequence number of the packet of losing also not having enough time to be identified and the timestamp that this packet arrives or discovery is lost.This formation is to arrange according to the time sequencing that the correct reception of packet sequence number or discovery are lost, and correctly receives at first or detect the foremost that is recorded in formation of missing data bag.Detect when the data receiver correctly receives packet at every turn whether the missing data bag is arranged, if frame losing is arranged the sequence number of one or more missing data bag and current time stamp are inserted into the confirmation waiting list, then the packet sequence number that will correctly receive and current time stamp are inserted into the confirmation waiting list; Otherwise the packet sequence number that directly will correctly receive and current time stamp are inserted into the confirmation waiting list.
The ACK information frame form of receiving terminal feedback is as shown in table 1:
Table 1 is ACK information frame form
| The bitmap type | No. SN | Bitmap |
The ACK frame adopts accumulation to confirm bitmap and two kinds of forms of non-accumulation confirmation bitmap.When the confirmation type of ACK was accumulation acknowledgement bit graph type, Bit 1 expression was the confirmation of the reception condition of SN+1 packet to sequence number, if be 1 this packet of expression is received uprightly really receives, i.e. positive acknowledgement; If be 0 expression not correct reception the, i.e. Negative Acknowledgement.The confirmation of Bit 2 expressions to the reception condition of the packet of sequence number SN+2, in like manner Bit 3 is to the confirmation of Bit N bit representation packet reception condition from SN+3 to SN+N to sequence number.Accumulation acknowledgement bit graph type is always to the packet Negative Acknowledgement of SN, to the packet positive acknowledgement before SN; When the confirmation type of ACK was non-accumulation acknowledgement bit graph type, Bit 1 expression was the confirmation of the reception condition of SN packet to sequence number, if be 1 this packet of expression is received uprightly really receives, i.e. positive acknowledgement; If be 0 expression not correct reception the, i.e. Negative Acknowledgement.Bit2 represents the confirmation to the reception condition of the packet of sequence number SN+1, and in like manner Bit 3 is to the confirmation of the packet reception condition of Bit N bit representation sequence number from SN+2 to SN+N-1.Non-accumulation acknowledgement bit graph type is neither done positive acknowledgement to the packet before SN, does not also do Negative Acknowledgement.
Receiving terminal comprises three parallel handling processes: receive data bag, structure also send the ACK frame, safeguard that ACK confirms waiting list.
(1) concrete steps of receive data bag handling process are:
(1.1) but judge whether No. SN of receive data bag drops in the range of receiving of receive window.If received by window; If not, return;
(1.2) judge No. SN of the receive data bag be whether receiveNumHighEdge greater than the record of last correct packet that receives of receive window; If change step (1.3) over to; If not, directly change step (1.4) over to;
(1.3) upgrade receiveNumHighEdge, and the receiving record between former receiveNumHighEdge and new receiveNumHighEdge is joined in ACK confirmation waiting list, the order of insertion is followed the process that No. SN circulation risen.Temporarily regard these packets as the correct packet that receives, and be these packets interpolation timestamps;
(1.4) do not confirm waiting list if the receive data bag also inserts ACK, the packet data recording that receives is inserted ACK and confirm in waiting list;
(1.5) upgrade the receive window lower edge, namely find later on first can correctly not receive and wait for No. SN of not overtime packet at the receive data bag, with upgrading the receive window lower edge for this No. SN;
The packet that (1.6) will correctly receive, namely the former lower edge of receive window is recorded to the packet of new lower edge record, removes window, gives the upper strata Microsoft Loopback Adapter and processes, and confirm to delete corresponding record waiting list from ACK;
(2) concrete steps of constructing and send ACK frame handling process are:
(2.1) judge that ACK confirms whether waiting list is empty; If empty, get No. SN from the lower edge of receiver window; If be not empty, get No. SN from first element of ACK confirmation waiting list;
(2.2) whether No. SN of obtaining of determining step (2.1) drops in receive window; If, No. SN as the ACK frame with this No. SN; If not, force No. SN as the ACK frame with the window lower edge;
(2.3) relation of No. SN of obtaining of determining step (2.2) and receive window lower edge.If identical, adopt accumulation bitmap ACK pattern; If different, adopt non-accumulation bitmap ACK pattern.Select the ACK type according to the wrong or correct accepting state of bag;
(2.4) according to the ACK type structure ACK frame of selecting;
(2.5) No. SN of comprising in confirmation confirmed to delete waiting list from ACK;
(2.6) send the ACK frame;
(3) safeguard that ACK confirms that the concrete steps of waiting list handling process are:
(3.1) will confirm that waiting list all wait acknowledge times of front are greater than the knot removal that records of abandoning the acknowledging time thresholding, namely abandon the wait acknowledge time is confirmed greater than the packet of abandoning the acknowledging time thresholding, wherein abandon time-out time that the acknowledging time thresholding equals to send overtime timer and deduct and begin to send ACK from the data receiver and receive the processing time of this ACK to data receiver fully.
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, reduced to switch the probability that causes data-bag lost because of terminal between LTE and WLAN link;
By sliding window mechanism, avoided switching between LTE and WLAN link because of terminal the problem of the data packet disorder arrival that causes, guaranteed that the IP packet is submitted to transport layer according to the order of sequence;
Realize the ARQ agreement in the IP aspect, for transport layer provides reliability services, effectively reduce TCP and enter the probability that starts or recover soon slowly, guaranteed data transmission efficiency and network throughput;
Adopt efficient affirmation mode, reduce as far as possible the shared bandwidth resources of confirmation, guaranteed the data transmission quality in LTE-WLAN heterogeneous wireless network system under the prerequisite that does not affect network throughput.
Description of drawings
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 the ACK feedback information;
Fig. 5 c is the handling process schematic diagram that cross-layer ARQ module transmitting terminal upgrades the transmission state;
Fig. 6 is receive window schematic diagram in cross-layer ARQ module;
Fig. 7 a is the handling process schematic diagram of cross-layer ARQ module receiving terminal receive data bag;
Fig. 7 b is the handling process schematic diagram that the ACK feedback information was constructed and sent to cross-layer ARQ module receiving terminal;
Fig. 7 c is that cross-layer ARQ module receiving terminal safeguards that ACK confirms the handling process schematic diagram of waiting list.
Embodiment
Below in conjunction with accompanying drawing, invention is elaborated, but following examples are only illustrative, protection scope of the present invention is not subjected to the restriction of these embodiment.
Fig. 1 is the overall architecture of LTE-WLAN heterogeneous wireless network system, and system comprises two multimode terminals, 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 be self-defined Microsoft Loopback Adapter and the cross-layer ARQ agreement of realizing all, in addition, gateway is self-defined realizing route selection, network address conversion module also, and the self-defined realizing route of end is selected module.The position of cross-layer ARQ protocol module in LTE-WLAN heterogeneous wireless network system as shown in Figure 3, at transmitting terminal, the ARQ module be input as buffering area A, be output as buffering area C, preserved the pointer of IP packet in buffering area.Microsoft Loopback Adapter is write the IP packet to buffering area A, the ARQ process reads these IP packets from buffering area A, write buffering area C after sealing up No. SN, the physical network card of WLAN and LTE sends process read data packet from buffering area C more again, completes after interpolation respective protocol head and gives out a contract for a project; At receiving terminal, the ARQ module be input as buffering area D, be output as buffering area B, preserved the pointer of IP packet in buffering area.The ARQ process reads physical network card and catches next IP packet from buffering area D, after whole order, feedback processing, the packet that correctly receives is write buffering area B according to the order of sequence, and the Microsoft Loopback Adapter receiving process reads in the IP packet that passes through whole order from buffering area B, give the upper-layer protocol stack and process.
The realization of cross-layer ARQ agreement mainly is divided into transmitting terminal and receiving terminal two parts:
Transmitting terminal has been safeguarded 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 the send window lower edge, indicates first transmission and does not correctly receive the packet of (SEND_NOT_RESPONSE), and sendNumHighEdge indicates the packet of last transmission.
Transmitting terminal processing data packets flow process mainly comprises three parallel processes as shown in Fig. 5 a, Fig. 5 b, Fig. 5 c: send packet, receive the ACK feedback information, upgrade the transmission state.
(1) concrete steps of transmission processing data packets flow process are:
(1.1) read the IP packet of some the buffering area that provides from Microsoft Loopback Adapter (being buffering area A), and write the round-robin queue at send window place, until transmitting terminal round-robin queue is filled or buffering area A for only empty;
(1.2) in send window, from the lower edge, read successively a fixed number state and be NOT_SEND and do not send for empty IP packet, start simultaneously transmission timer, transmission times is added one,, its state is set to SEND_NOT_RESPONSE record the corresponding data bag No. SN;
(2) concrete steps of reception ACK feedback information handling process are:
(2.1) receive the ACK feedback, judge whether ACK information drops in send window for corresponding No. SN, if not, return; If obtain the relative position of this ACK in send window;
(2.2) according to the position of ACK at send window, the state that upgrades the correct packet that receives in send window is SEND_AND_RESPONSE, and the packet that can correctly not receive 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 simultaneously the number that has sent packet, the i.e. value of sendNumHighEdge – sendLowEdge.
(3) upgrading the concrete steps that send the state processing flow process is:
(3.1) the main effect of this step is in order to trigger overtime re-transmission and to abandon retransmitting packet over maximum retransmission.Check that in send window, state is corresponding transmission timer and the transmission times of packet of SEND_NOT_RESPONSE, if transmission timer is overtime, the state with this packet is set to NOT_SEND; If transmission times surpasses maximum retransmission, the state with this packet is set to SEND_AND_RESPONSE.Time-out time should be arranged to slightly greater than the maximum link round-trip delay, and transmitting terminal transmission processing time and receiving terminal ACK structure time delay sum.
Receiving terminal has been safeguarded 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 the receive window lower edge, indicates first packet that can correctly not receive, and receiveNumHighEdge indicates last correct packet that receives.
Receiving terminal processing data packets flow process mainly comprises three parallel processes as shown in Fig. 7 a, Fig. 7 b, Fig. 7 c: receive data bag, structure also send the ACK feedback information, safeguard that ACK confirms waiting list.
(1) concrete steps of receive data bag handling process are:
(1.1) but judge whether No. SN of receive data bag drops in the range of receiving of receive window.If received by window; If not, return;
(1.2) judge whether greater than the record (being receiveNumHighEdge) of last correct packet that receives of receive window No. SN of the receive data bag.If change step (1.3) over to; If not, directly change step (1.4) over to;
(1.3) upgrade receiveNumHighEdge, and the receiving record between former receiveNumHighEdge and new receiveNumHighEdge is joined in ACK confirmation waiting list, the order of insertion is followed the process that No. SN circulation risen.Temporarily regard these packets as the correct packet that receives, and be these packets interpolation timestamps.After these packets have passed through the overtime number of retransmissions of overtime re-transmission time *, still do not have and can correctly receive, just can force movably receiving window according to this timestamp;
(1.4) do not confirm waiting list if the receive data bag also inserts ACK, the packet that receives is inserted ACK and confirm in waiting list;
(1.5) upgrade the receive window lower edge, namely find later on first can correctly not receive and wait for No. SN of not overtime packet at the receive data bag, upgrade receiveLowEdge with this No. SN;
The packet that (1.6) will correctly receive, namely former receiveLowEdge to the packet of new receiveLowEdge-1, removes window, gives the upper strata Microsoft Loopback Adapter and processes, and confirm to delete corresponding record waiting list from ACK;
(2) concrete steps of constructing and send ACK frame handling process are:
(2.1) judge that ACK confirms whether waiting list is empty.If empty, get No. SN from the lower edge of receiver window; If be not empty, get No. SN from first element of ACK confirmation waiting list;
(2.2) whether No. SN of obtaining of determining step (2.1) drops in receive window.If, No. SN as the ACK frame with this No. SN; If not, force No. SN as the ACK frame with the window lower edge;
(2.3) relation of No. SN of obtaining of determining step (2.2) and receive window lower edge.If identical, adopt accumulation bitmap ACK pattern; If different, adopt non-accumulation bitmap ACK pattern.Select the ACK type according to the wrong or correct accepting state of bag;
(2.4) according to the ACK type structure ACK frame of selecting;
(2.5) No. SN of comprising in confirmation confirmed to delete waiting list from ACK;
(2.6) send the ACK frame;
(3) safeguard that ACK confirms that the concrete steps of waiting list handling process are:
(3.1) calculate the maximum wait acknowledging time of confirming waiting list, if the maximum wait acknowledging time is abandoned the acknowledging time thresholding greater than what set, to confirm that waiting list all wait acknowledge times of front are greater than the knot removal that records of abandoning the acknowledging time thresholding, namely abandon the wait acknowledge time is confirmed (abandoning confirming strategy) greater than the packet of abandoning the acknowledging time thresholding, wherein abandoning time-out time that the acknowledging time thresholding equals to send overtime timer deducts and begins to send ACK from the data receiver and receive the processing time of this ACK to data receiver fully.
Abandon confirming that the effect of strategy is that the stand-by period in confirming wait is abandoned sending confirmation over the packet of thresholding, carry out overtime re-transmission by sending timeout mechanism, the sub-fraction packet is processed by overtime retransmission mechanism like this, most data packets still retransmits by Negative Acknowledgement mechanism, confirms not waste of bandwidth.
Claims (9)
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: add respectively Microsoft Loopback Adapter between the data link layer of terminal and gateway and network layer, to upper be the virtual fixing IP of application layer, on the impact of the different physical links of lower shielding bottom; Its realization comprises following steps:
(A) transmitting terminal
Transmitting terminal is safeguarded 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 transmission packet, confirmation of receipt character (ACK) information, upgrades three parallel handling processes of transmission state;
(B) receiving terminal
Receiving terminal is safeguarded 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 will safeguard that is also confirmed a waiting list, confirm that waiting list comprises that several record node, but each of confirmation waiting list records one of nodes records and correctly received or detected the sequence number of the packet of losing also not having enough time to be identified and the timestamp that this packet arrives or discovery is lost; This confirmation waiting list is to arrange according to the time sequencing that the correct reception of packet sequence number or discovery are lost, and correctly receives at first or detect the foremost that is recorded in formation of missing data bag; Detect when data receiver correctly receives packet at every turn whether the missing data bag is arranged, if frame losing is arranged the sequence number of one or more missing data bag and current time stamp are inserted into the confirmation waiting list, then the packet sequence number that will correctly receive and current time stamp are inserted into the confirmation waiting list; Otherwise the packet sequence number that directly will correctly receive and current time stamp are inserted into the confirmation waiting list; The ACK information frame form of receiving terminal feedback comprises: bitmap type, No. SN and bitmap;
Receiving terminal comprises three parallel handling processes: receive data bag, structure also send the ACK frame, safeguard that ACK confirms waiting list.
2. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network according to claim 1 system, it is characterized in that: send window length, receive window length are respectively 1/2 of round-robin queue.
3. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network according to claim 1 and 2 system, it is characterized in that: the concrete steps of the transmission processing data packets flow process of described transmitting terminal are:
(1.1) read the IP packet of some from the buffering area that Microsoft Loopback Adapter provides, and write the round-robin queue at send window place;
(1.2) in send window, from the lower edge, read successively a fixed number state and be NOT_SEND and do not send for empty IP packet, start simultaneously transmission timer, transmission times is added one,, its state is set to SEND_NOT_RESPONSE record the corresponding data bag No. SN.
4. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network according to claim 1 and 2 system, it is characterized in that: the concrete steps of the reception ACK message processing flow of described transmitting terminal are:
(2.1) receive the ACK feedback, judge whether ACK information drops in send window for corresponding No. SN, if not, return; If obtain the relative position of this ACK in send window;
(2.2) according to the position of ACK at send window, the state that upgrades the correct packet that receives in send window is SEND_AND_RESPONSE, and the packet that can correctly not receive is arranged to NOT_SEND, prepares to retransmit;
(2.3) the send window lower edge is moved to first state on the packet of SEND_AND_RESPONSE, upgrade simultaneously the number that has sent packet.
5. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network according to claim 1 and 2 system, it is characterized in that: the concrete steps that the renewal of described transmitting terminal sends the state processing flow process are:
Check that in send window, state is corresponding transmission timer and the transmission times of packet of SEND_NOT_RESPONSE, if timer expiry, the state with this packet is set to NOT_SEND; If transmission times surpasses maximum retransmission, the state with this packet is set to SEND_AND_RESPONSE.
6. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network according to claim 1 and 2 system is characterized in that: the ACK frame of described receiving terminal adopts accumulation to confirm that bitmap and non-accumulation confirm two kinds of forms of bitmap; When the confirmation type of ACK was accumulation acknowledgement bit graph type, Bit 1 expression was the confirmation of the reception condition of SN+1 packet to sequence number, if be 1 this packet of expression is received uprightly really receives, i.e. positive acknowledgement; If be 0 expression not correct reception the, i.e. Negative Acknowledgement; The confirmation of Bit 2 expressions to the reception condition of the packet of sequence number SN+2, in like manner Bit 3 is to the confirmation of Bit N bit representation packet reception condition from SN+3 to SN+N to sequence number; Accumulation acknowledgement bit graph type is always to the packet Negative Acknowledgement of SN, to the packet positive acknowledgement before SN; When the confirmation type of ACK was non-accumulation acknowledgement bit graph type, Bit 1 expression was the confirmation of the reception condition of SN packet to sequence number, if be 1 this packet of expression is received uprightly really receives, i.e. positive acknowledgement; If be 0 expression not correct reception the, i.e. Negative Acknowledgement; Bit2 represents the confirmation to the reception condition of the packet of sequence number SN+1, and in like manner Bit 3 is to the confirmation of the packet reception condition of Bit N bit representation sequence number from SN+2 to SN+N-1; Non-accumulation acknowledgement bit graph type is neither done positive acknowledgement to the packet before SN, does not also do Negative Acknowledgement.
7. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network according to claim 1 and 2 system, it is characterized in that: the concrete steps of the receive data bag handling process of described receiving terminal are:
(1.1) but judge whether No. SN of receive data bag drops in the range of receiving of receive window, if received by window; If not, return;
(1.2) judge No. SN of the receive data bag be whether receiveNumHighEdge greater than the record of last correct packet that receives of receive window; If change step (1.3) over to; If not, directly change step (1.4) over to;
(1.3) upgrade receiveNumHighEdge, and the receiving record between former receiveNumHighEdge and new receiveNumHighEdge is joined ACK to be confirmed in waiting list, the order of inserting is followed the process that No. SN circulation risen, temporarily regard these packets as the correct packet that receives, and be these packets interpolation timestamps;
(1.4) do not confirm waiting list if the receive data bag also inserts ACK, the packet data recording that receives is inserted ACK and confirm in waiting list;
(1.5) upgrade the receive window lower edge, namely find later on first can correctly not receive and wait for No. SN of not overtime packet at the receive data bag, with upgrading the receive window lower edge for this No. SN;
The packet that (1.6) will correctly receive, namely the former lower edge of receive window is recorded to the packet of new lower edge record, removes window, gives the upper strata Microsoft Loopback Adapter and processes, and confirm to delete corresponding record waiting list from ACK.
8. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network according to claim 1 and 2 system is characterized in that: the structure of described receiving terminal and the concrete steps that send ACK frame handling process are:
(2.1) judge that ACK confirms whether waiting list is empty; If empty, get No. SN from the lower edge of receiver window; If be not empty, get No. SN from first element of ACK confirmation waiting list;
(2.2) whether No. SN of obtaining of determining step (2.1) drops in receive window; If, No. SN as the ACK frame with this No. SN; If not, force No. SN as the ACK frame with the window lower edge;
(2.3) relation of No. SN of obtaining of determining step (2.2) and receive window lower edge.If identical, adopt accumulation bitmap ACK pattern; If different, adopt non-accumulation bitmap ACK pattern, select the ACK type according to the wrong or correct accepting state of bag;
(2.4) according to the ACK type structure ACK frame of selecting;
(2.5) No. SN of comprising in confirmation confirmed to delete waiting list from ACK;
(2.6) send the ACK frame.
9. the cross-layer ARQ method in LTE-WLAN heterogeneous wireless network according to claim 1 and 2 system, it is characterized in that: the ACK that safeguards of described receiving terminal confirms that the concrete steps of waiting list handling process are:
To confirm that waiting list all wait acknowledge times of front are greater than the knot removal that records of abandoning the acknowledging time thresholding, namely abandon the wait acknowledge time is confirmed greater than the packet of abandoning the acknowledging time thresholding, wherein abandon time-out time that the acknowledging time thresholding equals to send overtime timer and deduct and begin to send ACK from the data receiver and receive the processing time of this ACK to data receiver fully.
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