CN102684854B - Self-adaptive adjustment method of ARQ (automatic repeat request) parameter of MAC (media access control) layer - Google Patents
Self-adaptive adjustment method of ARQ (automatic repeat request) parameter of MAC (media access control) layer Download PDFInfo
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Abstract
The invention discloses a self-adaptive adjustment method of an ARQ (automatic repeat request) parameter of an MAC (media access control) layer. The self-adaptive adjustment method comprises the steps: S1. dividing the network condition into three conditions of good, medium and poor according to the ratio of NACK (negative acknowledgement) and ACK (acknowledgment) received by a transmitting terminal; S2. setting the ARQ parameter according to the good condition of the network by the transmitting terminal according to a modulation encoding mode of a physical layer and service quality QoS priority while building connection, and transmitting a DSA-REQ request to build a new service flow; and S3. starting a timer Tmonitor by the transmitting terminal in a data transmission process, counting the quantity of the NACK and the ACK within a preset time interval, estimating the network condition according to the ratio of the NACK and the ACK, and negotiating the ARQ parameter again through DSC if the network condition or the modulation encoding mode of the physical layer changes. According to the method adopted by the invention, sudden drop of the performance under the condition that the ARQ parameter and the network condition or the modulation encoding mode of the physical layer are mismatched can be avoided and the throughput of the MAC layer is improved, so that the performance of the overall network achieves the optimal state.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to (the Media Access Control of MAC in a kind of BWA, medium education) self-adapting regulation method of layer ARQ (Automatic Repeat reQuest, HARQ) parameter.
Background technology
BWA requires to realize reliable link in changeable wireless channel, and this target is first by adopting suitable transmission and multiple access technology, the parameter designing of optimization, intelligentized link adaptation techniques, the reliably multi-antenna technology of channel coding/decoding technology and advanced person to realize.Even if but have employed above-mentioned measure, be also difficult to avoid error of transmission completely.ARQ technology is exactly wrap to occurring the method revised by mistake, namely at transmitting terminal, the packet on upper strata is divided into little subdata bag, and sends.If receiving terminal finds that certain subdata bag does not correctly receive, then can require that transmitting terminal retransmits.WiMAX (Worldwide Interoperability for Microwave Access, worldwide interoperability for microwave access) network based on IEEE 802.16 standard is becoming one of broadband wireless access dominant technology within the scope of metropolitan area network.In IEEE 802.16 standard, WirelessMAC-SCa, WirelessMAC-OFDM, WirelessMAC-OFDMA tri-kinds of physical specification all support ARQ mechanism, wherein WirelessMAC-OFDMA also can select hybrid ARQ, i.e. FEC (Forward Error Correction, forward error correction)+ARQ mechanism.
The ARQ mechanism that the MAC layer of IEEE 802.16 adopts is selective retransmission mode, and namely transmitting terminal safeguards a cache table, but preservation has sent the packet and sequence number that do not receive ARQ positive feedback (ACK); Receiving terminal also safeguards that corresponds to the correct reception cache table receiving packet.After sending a packet, transmitting terminal does not stop wait-for-response, but continues to send new packet.If correctly received, receiving terminal returns ACK, and transmitting terminal deletes corresponding packet; Otherwise return ARQ negative feedback (NACK), transmitting terminal then retransmits corresponding packet, continues to send new packet by current order simultaneously; If transmitting terminal does not receive ACK or NACK at the appointed time, also corresponding data bag will be retransmitted.When connecting between transmitting terminal and receiving terminal, just should pass through DSA (dynamic service addition, dynamic service flow creates) consult the parameter determining ARQ, DSC (dynamic service change, dynamic service flow is revised) can be passed through again consult ARQ parameter in connection maintenance process.ARQ parameter mainly comprises ARQ block size (ARQ_BLOCK_SIZE), Retransmission timeout time (ARQ_RETRY_TIMEOUT), sliding window size (ARQ_WINDOW_SIZE), block operable time (ARQ_BLOCK_LIFETIME), and arranging the performance impact such as time delay and throughput of MAC layer data flow of these four parameters is particularly crucial.And their value has different optimum ranges under heterogeneous networks situation, physical layer modulation coded system and service quality (QoS), once mismatch, MAC layer performance will sharply decline, and be usually expressed as throughput and reduce, time delay increases.Connect if upper layer data stream is TCP, continuation is spread by its impact, causes whole TCP flow throughput to be down to extremely low.And the method how setting best ARQ parameter according to real-time network condition, physical layer modulation coded system and service quality (QoS) is not proposed in prior art.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is, for above-mentioned defect, how to provide a kind of self-adapting regulation method of MAC layer ARQ parameter, and it can reduce the time delay of network MAC layer data stream and improve the throughput of network MAC layer data stream.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of self-adapting regulation method of MAC layer ARQ parameter, described self-adapting regulation method comprises step:
S1: the ARQ negative feedback NACK received according to transmitting terminal and the ratio of positive feedback ACK network condition is divided as well, neutralizes and differ from three kinds of situations;
S2: when connection establishment, transmitting terminal, according to physical layer modulation coded system and service quality QoS priority, arranges ARQ parameter according to network situation as well, sends DSA-REQ message request and sets up new service flow;
S3: in data transmission procedure, transmitting terminal starts a timer T
monitor, the number of NACK and the ACK received in statistics scheduled time slot, carrys out estimation network situation according to the ratio of NACK and ACK, if network condition or physical layer modulation coded system change, then again consults ARQ parameter by DSC.
Preferably, transmitting terminal described in step S3 starts a timer T
monitor, the number of NACK and the ACK received in statistics scheduled time slot specifically comprises: if transmitting terminal receives the data MAC PDU comprising ARQ feedback message, then determine whether first ARQ feedback information of this connection, if so, then starts timer T
monitor, record the number of NACK and ACK respectively; Otherwise, the number of cumulative NACK and ACK respectively.
Preferably, step S2 specifically comprises:
When connection establishment, transmitting terminal, according to QoS priority classification rule, will need the data-mapping sent in different QoS queues, set up its service flow ID, according to service flow properties, set up qos parameter set, judge whether this qos parameter set is exist, if for existing, start to transmit data; Otherwise, judge whether to start timer T7, if started, show to send DSA-REQ, wait for DSA-RSP, if receive DSA-RSP, then delete timer T7, the qos parameter set of this service flow is set to existence, send DSA-ACK; Otherwise, be indicated as one newly to connect, then its service flow ID is mapped to new CID, and send DSA-REQ administrative messag, ARQ Enable in wherein Service flow encodings field is set to 1, according to QoS priority, the physical layer modulation coded system at this connection place, ARQ parameter is set according to network condition situation as well, start timer T7, send connection establishment request.
Preferably, if when connection establishment, transmitting terminal wait-receiving mode end reply message timer T7 time-out, then according to network condition be difference situation to adjust ARQ parameter, send DSA-REQ, restart timer T7, resend request.
Preferably, the length of described scheduled time slot is level second.
Preferably, described ARQ parameter at least comprises:
ARQ block size, Retransmission timeout time, sliding window size and block operable time.
Preferably, described step S1 specifically comprises:
If the ratio of NACK and ACK is n, if n < 0.5%, judge that network condition as well; If 0.5% < n < 1%, in judging that network condition is; If n > 1%, judge that network condition is as poor.
(3) beneficial effect
The present invention proposes the self-adapting regulation method of how MAC layer ARQ parameter, it can find out network condition, physical layer modulation coded system in real time, and according to different network conditions, be optimum value by ARQ optimum configurations, thus the performance such as the time delay of raising network MAC layer data stream and throughput.
Accompanying drawing explanation
Fig. 1 is the flow chart of the self-adapting regulation method of the MAC layer ARQ parameter of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Fig. 1 is the flow chart of the self-adapting regulation method of the MAC layer ARQ parameter of the embodiment of the present invention; As described in Figure 1, described self-adapting regulation method comprises step:
S1: network condition is divided as well by the ratio of NACK and the ACK received according to transmitting terminal, neutralize and differ from three kinds of situations;
Such as, if the ratio of NACK and ACK is n, if n < 0.5%, judge that network condition as well; If 0.5% < n < 1%, in judging that network condition is; If n > 1%, judge that network condition is as poor.
S2: when connection establishment, transmitting terminal is according to physical layer modulation coded system and service quality (QoS) priority, according to network situation as well, ARQ parameter is set, send DSA-REQ (dynamic service addition-request, dynamic service flow request to create) message request and set up new service flow;
This step specifically comprises: when connection establishment, transmitting terminal is according to QoS priority classification rule, to the data-mapping sent be needed in different QoS queues, set up its service flow ID (SFID), according to service flow properties, set up qos parameter set, judge whether this qos parameter set is exist.If for existing, start to transmit data, otherwise, judge whether to start timer T7 (see 2004 editions IEEE 802.16 standards), if started, show to send DSA-REQ (dynamic service addition-request, dynamic service flow request to create), wait for DSA-RSP (dynamic service addition-response, dynamic service flow creates response), if receive DSA-RSP, then delete timer T7, the qos parameter set of this service flow is set to existence, send DSA-ACK (dynamic service addition-acknowledgement, dynamic service flow creates and confirms), otherwise, be indicated as one newly to connect, then its SFID is mapped to new CID (connection identifier, connection identifier (CID), and send DSA-REQ administrative messag, ARQ Enable in wherein Service flow encodings field is set to 1, according to QoS priority, the physical layer modulation coded system at this connection place, ARQ parameter is set according to network condition situation as well.Start timer T7.Send connection establishment request.
In this step, if when connection establishment, transmitting terminal wait-receiving mode end reply message timer T7 time-out, then according to network condition be difference situation to adjust ARQ parameter, send DSA-REQ, restart timer T7, resend request.
S3: in data transmission procedure, transmitting terminal starts a timer T
monitor, the number of NACK and the ACK received in statistics scheduled time slot, carrys out estimation network situation according to the ratio of NACK and ACK, if network condition or physical layer modulation coded system change, then again consults ARQ parameter by DSC; Otherwise continue by ARQ parameter transmission before.
In this step, if network condition is the same with the result that the last time monitors, and physical layer modulation demodulation mode does not all become, then restart timer T
monitor.Otherwise, according to the judged result of network condition, the ARQ parameter in Service flow encodings field is reset in conjunction with physical layer modulation coding mode, send DSC-REQ (dynamic service change-request, dynamic service flow amendment request) administrative messag, start timer T7, if receive DSC-RSP (dynamic service change-response, dynamic service flow amendment response), then delete timer T7, send DSC-ACK (dynamic service change-acknowledgement, dynamic service flow amendment confirms).
Wherein, transmitting terminal starts a timer T
monitor, the number of NACK and the ACK received in statistics scheduled time slot specifically comprises: if transmitting terminal receives the data MAC PDU comprising ARQ feedback message, then determine whether first ARQ feedback information of this connection, if so, then starts timer T
monitor, record the number of NACK and ACK respectively; Otherwise, the number of cumulative NACK and ACK respectively.
The length of described scheduled time slot can be level second.
Described ARQ parameter mainly comprises ARQ block size, Retransmission timeout time, sliding window size, block operable time etc.
After receiving terminal receives MAC PDU, MAC PDU is classified, if be administrative messag DSA-REQ, accept the configuration of all about ARQ parameter in DSA-REQ, reply DSA-RSP, wait-receiving mode DSA-ACK; If be administrative messag DSC-REQ, accept the configuration of all about ARQ parameter in DSC-REQ, reply DSC-RSP, wait-receiving mode DSC-ACK; If be administrative messag DSA-ACK, receive DSA-ACK, all parameters of this service flow are set according to message content, start the data receiving and send this service flow; If be administrative messag DSC-ACK, receive DSC-ACK, revise the relevant parameter of this service flow according to message content, continue the data receiving and send this service flow; If be data MAC PDU, receive ARQ block according to MAC layer ARQ reception mechanism, and reply feedback message.
Be described the self-adapting regulation method of MAC layer ARQ parameter of the present invention with the example that is transmitted as of the upstream of the WiMAX network based on IEEE 802.16 standard below, wherein transmitting terminal is subscriber board, and receiving terminal is base station.
In connection establishment process, subscriber board is by DSA message and base station negotiate ARQ parameter.
Subscriber board, according to QoS priority classification rule, by needing the data-mapping sent in different QoS queues, being set up its service flow ID (SFID), according to service flow properties, being set up qos parameter set; Judge whether this qos parameter set is exist.It is now the connection establishment stage, qos parameter set does not exist, judge whether to start timer T7, be now the connection establishment stage, timer T7 does not start, be indicated as one newly to connect, then its SFID is mapped to new CID, and sends DSA-REQ administrative messag, the ARQ Enable in wherein Service flow encodings field is set to 1, according to QoS priority, the physical layer modulation coded system at this connection place, ARQ parameter is set according to network condition situation as well.Start timer T7.
After base station receives MAC PDU, MAC PDU is classified; That now receive is administrative messag DSA-REQ, then accept the configuration of all about ARQ parameter in DSA-REQ, replys DSA-RSP.Wait-receiving mode DSA-ACK.
If subscriber board does not receive DSA-RSP message before T7 time-out, the situation being difference according to network condition resets ARQ parameter, sends DSA-REQ, restarts timer T7, resend request.
If subscriber board receives DSA-RSP message before T7 time-out, then delete timer T7, the qos parameter set of this service flow is set to existence, send DSA-ACK.
After base station receives DSA-ACK message, all parameters of this service flow are set according to message content, start the data receiving and send this service flow.
In connection maintenance process, classify to MAC PDU after receiving the data MAC PDU of this connection in base station, that now receive is data MAC PDU, and judge whether to support ARQ, this connects support, receive ARQ block according to MAC layer ARQ reception mechanism, and reply feedback message.
After subscriber board receives MAC PDU, MAC PDU is classified, now receive for comprising the data MAC PDU message of ARQ feedback information and be this connection first ARQ feedback information, start timer T
monitor, the number of record NACK and ACK.
After subscriber board receives MAC PDU, MAC PDU is classified, now receive for comprising the data MAC PDU message of ARQ feedback information but be not this connection first ARQ feedback information, then the number of cumulative NACK and ACK.
In connection maintenance process, work as T
monitortime-out, calculates timer T
monitortime-out during this period of time in, the ratio n of NACK and ACK, if n < 0.5%, judges that network condition is as well; If 0.5% < n < 1%, in judging that network condition is; If n > 1%, judge that network condition is as poor; Whether subscriber board needs Sampling network situation or physical layer modulation coded system to change, if network condition is the same with the result that the last time monitors, and physical layer modulation demodulation mode does not all become, then restart timer T
monitor; Otherwise, according to the judged result of network condition, reset the ARQ relevant parameter in Service flow encodings field in conjunction with physical layer modulation coding mode, send DSC-REQ administrative messag, start timer T7.
In connection maintenance process, when subscriber board detects that network condition or physical layer modulation coded system change, DSC-REQ administrative messag will be sent to base station: after base station receives MACPDU, MAC PDU is classified, that now receive is administrative messag DSC-REQ, then accept the configuration of all about ARQ parameter in DSC-REQ, reply DSC-RSP, wait-receiving mode DSC-ACK.
If subscriber board does not receive DSC-RSP message before T7 time-out, the situation being difference according to network condition resets ARQ parameter, sends DSA-REQ, restarts timer T7.
If subscriber board receives MAC PDU before T7 time-out, classify to MAC PDU, that now receive is administrative messag DSC-RSP, then delete timer T7; Send DSC-ACK; After base station receives MAC PDU, classify to MAC PDU, that now receive is administrative messag DSC-ACK, revises the relevant parameter of this service flow according to message content, continues the data receiving and send this service flow.
In sum, the invention discloses a kind of self-adapting regulation method of MAC layer ARQ parameter, according to the method applied in the present invention, the ARQ feedback information real time monitoring network situation that can receive according to MAC layer, and upgrade ARQ parameter along with the change of network condition and physical layer modulation coded system, its parameter configuration is made to obtain optimum value, when avoiding ARQ parameter and network condition and physical layer modulation coded system mismatch, the performance brought sharply declines, improve the throughput of MAC layer, make the performance of whole network reach best.
Above execution mode is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (6)
1. a self-adapting regulation method for MAC layer ARQ parameter, is characterized in that, described self-adapting regulation method comprises step:
S1: network condition is divided as well by the ratio of NACK and the ACK received according to transmitting terminal, neutralize and differ from three kinds of situations;
S2: when connection establishment, transmitting terminal, according to physical layer modulation coded system and service quality QoS priority, arranges ARQ parameter according to network situation as well, sends DSA-REQ message request and sets up new service flow;
S3: in data transmission procedure, transmitting terminal starts a timer T
monitor, the number of NACK and the ACK received in statistics scheduled time slot, carrys out estimation network situation according to the ratio of NACK and ACK, if network condition or physical layer modulation coded system change, then again consults ARQ parameter by DSC;
Step S2 specifically comprises:
When connection establishment, transmitting terminal, according to QoS priority classification rule, will need the data-mapping sent in different QoS queues, set up its service flow ID, according to service flow properties, set up qos parameter set, judge whether this qos parameter set is exist, if for existing, start to transmit data; Otherwise, judge whether to start timer T7, if started, show to send DSA-REQ, wait for DSA-RSP, if receive DSA-RSP, then delete timer T7, the qos parameter set of this service flow is set to existence, send DSA-ACK; Otherwise, be indicated as one newly to connect, then its service flow ID is mapped to new CID, and send DSA-REQ administrative messag, ARQ Enable in wherein Service flow encodings field is set to 1, according to QoS priority, the physical layer modulation coded system at this connection place, ARQ parameter is set according to network condition situation as well, start timer T7, send connection establishment request.
2. self-adapting regulation method according to claim 1, is characterized in that, transmitting terminal described in step S3 starts a timer T
monitor, the number of NACK and the ACK received in statistics scheduled time slot specifically comprises: if transmitting terminal receives the data MAC PDU comprising ARQ feedback message, then determine whether first ARQ feedback information of this connection, if so, then starts timer T
monitor, record the number of NACK and ACK respectively; Otherwise, the number of cumulative NACK and ACK respectively.
3. self-adapting regulation method according to claim 1, it is characterized in that, if when connection establishment, transmitting terminal wait-receiving mode end replys the timer T7 time-out of message, then according to network condition be difference situation to adjust ARQ parameter, send DSA-REQ, restart timer T7, resend request.
4. the self-adapting regulation method according to any one of claim 1-3, is characterized in that, the length of described scheduled time slot is level second.
5. the self-adapting regulation method according to any one of claim 1-3, is characterized in that, described ARQ parameter at least comprises:
ARQ block size, Retransmission timeout time, sliding window size and block operable time.
6. the self-adapting regulation method according to any one of claim 1-3, is characterized in that, described step S1 specifically comprises:
If the ratio of NACK and ACK is n, if n<0.5%, judge that network condition as well; If 0.5%<n<1%, in judging that network condition is; If n>1%, judge that network condition is as poor.
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| 慢瑞利衰落信道下一种变分组长度的自适应ARQ协议;高明生;《通信学报》;20040930;第25卷(第9期);第50页第3段，第51页第5段，第54页第3段，第55页第2段 * |
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