CN101277271A - Access control method for distributed CDMA network medium with controllable power - Google Patents
Access control method for distributed CDMA network medium with controllable power Download PDFInfo
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Abstract
The invention provides a distribution type CDMA network media access control method with controllable power. When a node has data to send, a public code is used for sending RTS grouping, a receiving node uses the public code for receiving RTS grouping sent by the sending node, signal-noise ratio of the grouping is counted, if signal-noise ratio is higher than or equal to threshold signal-noise ratio, the receiving node feeds back power control information to the sending node through CTS grouping; on the other hand, the receiving node does not loop-back CTS grouping, the sending node adds transmitted power for re-transmitting RTS grouping. The sending node adjusts transmit power for transmitting data grouping to the receiving node after receives CTS grouping. The receiving node replies confirming ACK grouping after receives data grouping. When network node has no data to send, the public code is used for receiving control grouping, and corresponding treatment is processed according with received control grouping type. Under the condition of not increasing node hardware cost, the method provide by the invention can reduce average transmit power of network node, and increase space multiplexing degree of network, furthermore, network throughput is increased.
Description
Technical field
What the present invention relates to is a kind of access control method for distributed CDMA network medium with controllable power, specifically be a kind of by use public spreading code control alternately the grouping realize access control method for distributed CDMA network medium with controllable power, belong to distributed network medium access control technical field.
Background technology
In self-organizing network (Ad Hoc), wireless sensor network, grid network (mesh net) and multi-hop cellular network distributed cordless communication network, generally do not set up console for centralized control, thereby the use of Radio Resource can not carry out centralized unified scheduling and distribute, and can only decide whether and how to use wireless communication resources in its sole discretion by each network node.Network node uses the rule and the foundation of wireless communication resources, and network throughput, the level of resources utilization are all had material impact.Especially in the multi-hop distributed wireless networks, the packet that source node sends may need the forwarding of intermediate node, could arrive destination node.Like this, not only source node need adopt certain rule to use Radio Resource with the adjacent node competition, and intermediate node also needs competition to use Radio Resource in order to finish the forwarding task, and any conflict that takes place when using Radio Resource all will cause the packet can't be correctly or transmission in time.And the competition service regeulations of Radio Resource are determined by the media access control method that network node adopts usually, therefore media access control method reasonable in design is for the level of resources utilization that improves distributed wireless networks, and then the throughput performance of raising network, significant.
In order to improve the utilization ratio of Radio Resource in the distributed network, generally all need to implement the spatial reuse of Radio Resource.The spatial reuse degree of Radio Resource and the transmitting power of network node have important relation, transmitting power by the limiting network node, can roughly estimate the transmission radius (claiming that also jumps coverage) that node transmits, those network nodes that are in outside the source node transmission radius can adopt the Radio Resource service regeulations identical with source node, and can not be subjected to the influence that source node transmits, this has just formed the spatial reuse of Radio Resource.For Radio Resource bandwidth of determining and given whole network coverage, if the transmitting power of network node is bigger, the spatial reuse number of times is less so, packet only need just can arrive destination node through less hop count, on this meaning, efficiency of data packet transmission is higher, might reach higher network throughput.But then, the minimizing of spatial reuse number of times, the rival who faces when meaning each contention Radio Resource is more, and the possibility of competition failure is bigger, so network throughput is tending towards again reducing.These interactions, interactional relation show: the transmitting power of network node can have influence on the spatial reuse degree of Radio Resource, and then can the throughput of network be exerted an influence.
Carry out the multi-hop distributed wireless communication network that signal sends and receives for adopting code division multiple access (CDMA:Code Division Multiple Access) technology, on the one hand, network node can be shared Radio Resource at the network node that synchronization is adjacent, thereby has simplified the design of Radio Resource service regeulations; On the other hand, the network node number that synchronization is shared Radio Resource is many more, and the phase mutual interference of generation is just big more, and the difficulty of destination node or forward node receiver restoring signal is also big more.Thereby, reduce to use simultaneously the interstitial content of Radio Resource by the method for spatial reuse, still be necessary.Yet this moment, the transmitting power of network node not only determined the spatial reuse degree of network, jumps the interior size to other node interference power of coverage but also have influence on one, thereby the successful transmission of other node data grouping is had appreciable impact.Be embodied in: if stipulate that the transmitting power of each network node is identical, so bigger transmitting power is favourable for the Data Receiving of specific destination node (comprising forward node), but the transmitting power of the neighbor node of at this moment shared Radio Resource is also bigger, the transmitting power of a plurality of shared nodes will produce bigger interference, and the packet reception to destination node is again disadvantageous conversely.This self-interference problem of cdma system solves by the control of open Loop Power control and closed power in mobile communication system, these Poewr control methods normally depend on the Centralized Controller in the network---and the base station is dispatched and is realized.Yet in distributed wireless communication network, owing to do not have special Centralized Controller to finish the function of base station, thereby Centralized Power Control method and inapplicable, can only design the node power dispatching method that is suitable for Distributed C DMA network.
Find through literature search prior art, people such as A.Muqattash are at " IEEE INFOCOM ' 2003 " pp.470-480, deliver on 2003 " Power controlled dual channel (PCDC) medium accessprotocol for wireless Ad Hoc networks; " (IEEE Information And Communication international conference in 2003, in March, 2003,470 to 480 pages, the power-controlled double-channel media access control protocol that is used for Ad Hoc network) among, proposed a kind of based on two-channel power regulating method, each node uses two different frequency channels to send control grouping and packet in this method, this with regard to require each node can be simultaneously on a channel interception data and on one other channel, send data, realize that this function need realize relatively difficulty for two Transceiver Module of each node equipment.People such as Lee Jang-won are at " IEEE Transactions onVehicular Technology " vol.56, no.2, pp.801-809, " Jointopportunistic power scheduling and end-to-end rate control for wireless Ad Hocnetworks " (IEEE automotive electronics transactions of delivering on the March 2007, in March, 2007, the 56th volume, 801 to 809 pages, chance power dispatching of uniting in the wireless Ad Hoc network and rate controlled end to end) among the node power dispatching algorithm of joint Power scheduling and end-to-end rate controlled has been proposed, this method has solved the power dispatching problem of Ad Hoc network to a certain extent, but this method requires to exist master controller to realize the dispatching algorithm of power and speed in the network, because the node in the Ad Hoc network is a peer node, the Centroid that does not have the operation dispatching function, so the method that this article proposes is difficult to be realized in the actual design of Ad Hoc network.
Summary of the invention
The objective of the invention is to propose a kind of access control method for distributed CDMA network medium with controllable power, be used on the basis that does not increase the network node hardware cost, realize the distributed scheduling of network node transmitting power, and then improve the throughput performance of Distributed C DMA network.When the present invention has defined network node and shares Radio Resource and carry out information interaction some rules that should follow, by carrying out these rules, each network node can the required transmitting-receiving spreading code of self-configuration, determine simultaneously and adjustment signal transmission power separately, and then the energy consumption of minimizing network node, improve the spatial reuse degree of Distributed C DMA network, increase the throughput of network.
The present invention is applicable to self-organizing network, grid network (mesh net), multi-hop cellular network and the wireless sensor network that adopts the networking of self-organizing mode.Require emphasis in the present invention following some: the first, in the present invention, network node only need have a sender and a receiver, and sender is operated in identical frequency range with receiver with half-duplex mode; Second, in the present invention, so-called sending node is to point to the node that receiving node sends packet, so-called packet comprises packet that this sending node oneself produces and is the packet of other node forwarding, and so-called receiving node is meant that packet passes through each redirect and send out the destination node that will arrive; The 3rd, in the present invention, require each node to be equipped with a spread spectrum transceiver, and this transceiver can upgrade spreading code as required; The 3rd, in the present invention, require each node to have the ability to add up the signal to noise ratio of the control grouping that receives; The 4th, in the present invention, require network node to have the power adjustments function, can adjust transmitting power as required; The 5th, this method is applicable to slow fading channel, and promptly channel gain remains unchanged in the transmission cycle of a control grouping and packet; The 6th, the link between sending node and the destination node has bidirectional characteristic, and promptly sending node has identical channel gain to link between the destination node and destination node to the link between the sending node.
The present invention is achieved by the following technical solutions:
A kind of access control method for distributed CDMA network medium with controllable power, comprise two parts: the cut-in method when cut-in method when network node has packet to send and network node do not have packet to send, when network node had packet to send, cut-in method was:
A.1 sending node A from this node etc. take out packet the packet queue to be sent, according to the destination address in the packet, determine that receiving node is the Node B that destination address is pointed in this packet;
A.2 sending node A uses common code to send request to receiving node B and sends the RTS grouping, the RTS grouping includes type field, source address field, source node user code field, DAF destination address field, and transmitting power field, wherein type field is inserted and is represented that this is grouped into the identification code of RTS grouping, source address field is inserted the address of sending node A, source node user code field is inserted the user code of sending node A, DAF destination address field is inserted the address of receiving node B, the transmitting power field is inserted sending node A and is sent the RTS employed transmitting power PT that divides into groups, PT=Pp, Pp is the network node initial transmission power, satisfy functional relation Pp=f (SIRp) between the thresholding signal to noise ratio SIRp that node Initial Trans Pp and network are scheduled to, f (x) representative function mapping relations, the radius that the value of f (x) and the mapping relations between the x are jumped coverage by noise power in the network and network node average is determined; The data bit transmission error probability that channel coding/decoding scheme, modulation scheme and the receiver that SIRp is adopted by network node can allow is determined; Sending node A picks up counting, and enters step a.6;
A.3 the RTS that receiving node B use common code receives and despreading sending node A sends divides into groups, and obtains the signal to noise ratio SIRs that RTS divides into groups by statistics, and the user code that takes out source node in the RTS grouping upgrades the selected user code of this receiving node B;
A.4 the predetermined thresholding signal to noise ratio SIRp of RTS grouping signal to noise ratio SIRs that a.3 step is obtained and network compares, if SIRs＜SIRp, then receiving node B does not send clear to send CTS grouping to sending node A, enters step a.3; Otherwise receiving node B calculates redundant signal to noise ratio SIRa, SIRa=SIRs-SIRp, and according to the value PT of transmitting power field in the a.2 described RTS of the step grouping, the transmitting power of determining this receiving node B is PT-f (SIRa);
A.5 receiving node B sends the CTS grouping with the a.4 definite transmitting power PT-f (SIRa) of step to sending node A; The CTS grouping includes type field, source address field, DAF destination address field and transmitting power field, wherein type field is inserted and is represented that this is grouped into the identification code of CTS grouping, source address field is inserted the address of receiving node B, DAF destination address field is inserted the address of sending node A, and the transmitting power field is inserted the a.5 transmission power level PT-f (SIRa) of definite receiving node B of step;
If a.6 sending node A receives the CTS grouping that receiving node B sends at Tt in the time, then enter step a.7, otherwise a.9 sending node A enters step;
A.7 the value of transmitting power field in the CTS grouping that a.6 receives according to step of sending node A, determine that this sending node A is subsequently when receiving node B sends packet, employed transmitting power, the value of this transmitting power are got the value of transmitting power field in the CTS grouping;
A.8 sending node A uses the user code of this node A and the a.7 definite transmitting power of step to send packet to receiving node B, the user code that receiving node B uses step to determine in a.3 receives and the despread data grouping, sends to sending node A then and confirms the ACK grouping;
A.9 sending node A increases dt with transmitting power, and the value of transmitting power field in the RTS grouping increased dt, when repeating to send number of times, accumulative total allows to repeat to send number of times Rm less than maximum, and when transmitting power allows transmitting power smaller or equal to maximum, sending node A sends a RTS grouping to receiving node B again with the transmitting power that increases behind the dt, and return step a.6, otherwise, with receiving node B as unreachable processing;
A.10 receiving node B is unreachable, and sending node A joins this node with packet and waits in the transmission packet queue, reenters step a.1;
When network node did not have packet to send, cut-in method was:
B.1 network node A uses common code to receive and despreading control grouping, and is SIRs by the signal to noise ratio that statistics obtains receiving the control grouping; According to the value that receives type field in the control grouping, judge that whether receive the control grouping is the RTS grouping, if the control that receives is grouped into the RTS grouping, then enter step b.2, otherwise b.1 network node A re-executes step;
Whether the address of b.2 judging present networks node A is identical with destination address in the RTS grouping, if inequality, then network node A judges channel busy, postpones Δ t after the time, re-executes step b.1; Otherwise the user code that takes out source node in the RTS grouping upgrades the user code of present networks node A;
B.3 the predetermined thresholding signal to noise ratio SIRp of the reception control grouping signal to noise ratio SIRs that step is obtained in b.1 and network compares, and the data bit transmission error probability that channel coding/decoding scheme, modulation scheme and the receiver that SIRp is adopted by network node can allow is definite; If SIRs＜SIRp, then b.1 network node A enters step; Otherwise, network node A calculates redundant signal to noise ratio SIRa, SIRa=SIRs-SIRp, b.1 receive the value PT of transmitting power field in the control grouping according to step, the transmitting power of determining present networks node A is PT-f (SIRa), f (x) representative function mapping relations, the radius that the value of f (x) and the mapping relations between the x are jumped coverage by noise power in the network and network node average is determined;
B.4 the node transmitting power PT-f (SIRa) that b.3 determines with the step node that sends the RTS grouping in b.1 to step sends CTS and divides into groups; The source address field of CTS grouping is inserted the address of network node A, and DAF destination address field is inserted the address of node of the b.1 middle RTS of the transmission grouping of step, and the transmitting power field is inserted the node transmission power level PT-f (SIRa) that b.3 step is determined;
B.5 after the b.1 middle node that sends the RTS grouping of step is received the CTS grouping, use the transmitting power that the transmitting power field is determined in the user code of this node and the CTS grouping, send packet to network node A, after network node A received packet, the node that sends the RTS grouping to step in b.1 sent the ACK grouping.
Described access control method for distributed CDMA network medium with controllable power, the spreading code collocation method that adopts is: network disposes Ns spreading code altogether, one of them spreading code is as public spreading code, be called for short common code, this spreading code is used for sending the control grouping, for each network node in common knowledge; All the other Ns-1 spreading code is called for short user code as user's spreading code, is used to send packet; Network node is configured as common code with spreading code when initialization, the while is selected at random and sets a user code as this node initial user sign indicating number, and network node can upgrade this node user code as required; The rule that network node upgrades this node user code is: if the control that receives grouping is the RTS grouping, and this node address is identical with destination node address in the RTS grouping, then this node user code is updated to RTS divide into groups in the user code of source node; Otherwise this node user code still remains this node initial user sign indicating number.
Compared with prior art, the present invention has following advantage:
The invention provides a kind of access control method for distributed CDMA network medium with controllable power.Network node is when carrying out information interaction, and by adopting this connection control method, each network node can the required transmitting-receiving spreading code of self-configuration, determines simultaneously and adjusts the transmitting power that is adopted when sending grouping.In the present invention, each network node only needs a sender and a receiver, the hardware cost of network node does not increase, and the present invention do not need network to have the centralized control node of carrying out the power dispatching algorithm, has realized the distributed scheduling of network node transmitting power.Compare with other media access control method that is used for Distributed C DMA network, the present invention not only can guarantee Distributed C DMA network operate as normal, also has network node transmitting power controlled function, can effectively reduce the average transmit power of network node, reduce the energy consumption of network node, improve the spatial reuse degree of distributed network, and then increase network throughput, and the principle of the invention is simple, is easy to be used among the Distributed C DMA network communication terminal.
Description of drawings
Fig. 1 shows one and uses specific embodiments of the invention.A, B, four network nodes of C, D are arranged among the figure, and node A will carry out message transmission with Node B, and A is a sending node, and B is a receiving node.R is the radius that network node average is jumped coverage.
Fig. 2 shows the control packet frames structure that the present invention adopts.The control grouping that the present invention adopts comprises that request sends the RTS grouping, and the ACK grouping is confirmed in clear to send CTS grouping.
Fig. 3 shows the access process figure that carries out when network node has packet to send.
Fig. 4 shows the access process figure that carries out when network node does not have data to send.
Embodiment:
Below in conjunction with accompanying drawing, specify operation principle of the present invention.
In order to realize, so that carry out more efficiently information interaction between the network node, the grouping of channel is divided into two classes: control grouping and packet to the control of the power of Distributed C DMA network node.The transmission of control signaling, the function that the spreading code configuration feature of network enabled node and node transmitting power are determined and adjusted are finished in the control grouping; Packet is used for the business transferring data, and required spreading code and transmitting power are by the message decision of control packet delivery.
Control grouping on the channel has three classes, and the request of being respectively sends RTS grouping, clear to send CTS grouping and confirms the ACK grouping.The form of all kinds of controls grouping as shown in Figure 2, wherein the meaning of each several part is as follows:
Type: be used to identify the type of control grouping, can set different identification codes and represent the RTS grouping respectively, CTS grouping, and ACK grouping; Block length: be used to illustrate the bit number that this control grouping comprises; Source address: expression sends the node address of this control grouping; The user code of source node: expression sends the employed user code of node of this control grouping; Destination address: represent the node address that this control grouping will be mail to; Transmitting power: the transmitting power that is used to illustrate use when node is launched this control grouping; CRC: redundancy check.
Have the media access control method of control function of power in the Distributed C DMA network that the present invention proposes, its embodiment is as follows:
1, is the network node configures initiation parameter.Before the network node access channel is initiated message transmission, need carry out initialization to network node, be each the node distribution node address in the network, set Initial Trans, and dispose initial spreading code, mainly comprise following content:
A. for each node in the network distributes a unique physical address that is different from other nodes or ID sign, be referred to as node address.
B. be each node setting Initial Trans Pp in the network.Satisfy functional relation Pp=f (SIRp) between the thresholding signal to noise ratio SIRp that node Initial Trans Pp and network are scheduled to, f (x) representative function mapping relations, the radius that the value of f (x) and the mapping relations between the x are jumped coverage by noise power in the network and network node average is determined.If represent antenna gain between the transceiver with K, R represents the radius of the average jumping coverage of network node, and W represents the noise power in the network, and f (x)=WR is then arranged
η/ Kx, wherein η is the path attenuation index, so the node Initial Trans is Pp=f (SIRp)=WR
η/ KSIRp.The data bit transmission error probability that channel coding/decoding scheme, modulation scheme and the receiver that SIRp is adopted by network node can allow is determined, for example, network node adopts the BPSK modulation, and the data bit transmission error probability that receiver can allow is p
b=10
-5, under the situation that does not adopt chnnel coding, the predetermined thresholding signal to noise ratio of network should be got SIRp=9.6dB.
C. be the initial spreading code of each node configuration in the network.Use Distributed C DMA network of the present invention and dispose Ns spreading code l altogether
1, l
2..., l
Ns, Ns is a positive integer, one of them spreading code is called for short common code as public spreading code, and is in common knowledge for each network node, is used for network node and sends or receive the control grouping; All the other Ns-1 spreading code is called for short user code as user's spreading code, is used for network node and sends or receive packet.Network node is configured as common code with spreading code when initialization, select and set simultaneously the initial user sign indicating number of a user code as this node at random.In the moment of follow-up transmission or reception packet, network node can upgrade the user code of this node as required.Network node at first uses common code to send and receives controls grouping, and carries the information reconciliation decision by the control grouping, employed user code when follow-up transmission or reception packet.The rule that network node upgrades this node user code is: if the control that receives grouping is the RTS grouping, and this node address is identical with destination node address in the RTS grouping, then this node user code is updated to RTS divide into groups in the user code of source node; Otherwise this node user code still remains this node initial user sign indicating number.
2, the overall process of carrying out message transmission between network node is: after network node is finished initialization, enter formal stage of communication, when node has data to send, use common code to send request and send the RTS grouping, receiving node uses the RTS grouping that common code receives and the despreading sending node sends, add up the signal to noise ratio of this grouping, more than or equal to the thresholding signal to noise ratio, receiving node divides into groups to the control information of sending node feedback power by clear to send CTS as if signal to noise ratio; Otherwise, not loopback of receiving node CTS grouping, sending node then increases transmitting power and resends the RTS grouping.After sending node is received the CTS grouping, readjust transmitting power, send packet to receiving node according to the value of transmitting power field in the CTS grouping.After receiving node is received packet, reply and confirm the ACK grouping, so far the primary information transmission course finishes.When network node did not have data to send, the use common code received and despreading control grouping, makes respective handling according to controlling packet type and comprising information.
3, a kind of access control method for distributed CDMA network medium with controllable power, comprise two parts: the cut-in method when cut-in method when network node has packet to send and network node do not have packet to send, shown in Figure 3, when network node had packet to send, cut-in method was:
A.1 sending node A from this node etc. take out packet the packet queue to be sent, according to the destination address in the packet, determine that receiving node is the Node B that destination address is pointed in this packet;
A.2 sending node A uses common code to send request to receiving node B and sends the RTS grouping, the RTS grouping includes type field, source address field, source node user code field, DAF destination address field, and transmitting power field, wherein type field is inserted and is represented that this is grouped into the identification code of RTS grouping, source address field is inserted the address of sending node A, source node user code field is inserted the user code of sending node A, DAF destination address field is inserted the address of receiving node B, the transmitting power field is inserted sending node A and is sent the RTS employed transmitting power PT that divides into groups, PT=Pp, Pp=WR
η/ KSIRp is the network node initial transmission power, and SIRp is the predetermined thresholding signal to noise ratio of network, and the data bit transmission error probability that channel coding/decoding scheme, modulation scheme and the receiver that SIRp is adopted by network node can allow is determined; Sending node A picks up counting, and enters step a.6;
A.3 the RTS that receiving node B use common code receives and despreading sending node A sends divides into groups, and obtains the signal to noise ratio SIRs that RTS divides into groups by statistics, and the user code that takes out source node in the RTS grouping upgrades the selected user code of this receiving node B;
A.4 the predetermined thresholding signal to noise ratio SIRp of RTS grouping signal to noise ratio SIRs that a.3 step is obtained and network compares, if SIRs＜SIRp, then receiving node B does not send clear to send CTS grouping to sending node A, enters step a.3; Otherwise receiving node B calculates redundant signal to noise ratio SIRa, SIRa=SIRs-SIRp, and according to the value PT of transmitting power field in the a.2 described RTS of the step grouping, the transmitting power of determining this receiving node B is PT-f (SIRa)=PT-WR
η/ KSIRa;
A.5 receiving node B sends the CTS grouping with the a.4 definite transmitting power PT-f (SIRa) of step to sending node A; The CTS grouping includes type field, source address field, DAF destination address field and transmitting power field, wherein type field is inserted and is represented that this is grouped into the identification code of CTS grouping, source address field is inserted the address of receiving node B, DAF destination address field is inserted the address of sending node A, and the transmitting power field is inserted the a.5 transmission power level PT-f (SIRa) of definite receiving node B of step;
If a.6 sending node A receives the CTS grouping that receiving node B sends at Tt in the time, then enter step a.7, otherwise a.9 sending node A enters step.Here get Tt=2ts+2tp, ts is CTS grouping or RTS packet delivery time, and tp is that wireless signal is transferred to receiving node B from sending node A, or is transferred to the propagation delay that sending node A is experienced from receiving node B.
A.7 the value of transmitting power field in the CTS grouping that a.6 receives according to step of sending node A, determine that this sending node A is subsequently when receiving node B sends packet, employed transmitting power, the value of this transmitting power are got the value of transmitting power field in the CTS grouping;
A.8 sending node A uses the user code of this node A and the a.7 definite transmitting power of step to send packet to receiving node B, the user code that receiving node B uses step to determine in a.3 receives and the despread data grouping, sends to sending node A then and confirms the ACK grouping;
A.9 sending node A increases dt with transmitting power, and the value of transmitting power field in the RTS grouping increased dt, when repeating to send number of times, accumulative total allows to repeat to send number of times Rm less than maximum, and when transmitting power allows transmitting power smaller or equal to maximum, sending node A sends a RTS grouping to receiving node B again with the transmitting power that increases behind the dt, and return step a.6, otherwise, with receiving node B as unreachable processing.If represent the maximum transmitting power that allows with Pm, then maximum allows to repeat to send between number of times and the transmitting power increase and decrease amplitude dt to satisfy relation: Rm * dt=Pm-Pp, and Pp is the network node Initial Trans, and Rm is a positive integer.
A.10 receiving node B is unreachable, and sending node joins this node with packet and waits in the transmission packet queue, reenters step a.1;
When network node did not have packet to send, cut-in method was:
B.1 network node A uses common code to receive and despreading control grouping, and is SIRs by the signal to noise ratio that statistics obtains receiving the control grouping; According to the value that receives type field in the control grouping, judge that whether receive the control grouping is the RTS grouping, if the control that receives is grouped into the RTS grouping, then enter step b.2, otherwise b.1 network node A re-executes step;
Whether the address of b.2 judging present networks node A is identical with destination address in the RTS grouping, if inequality, then network node A judges channel busy, postpones Δ t after the time, re-executes step b.1; Otherwise the user code that takes out source node in the RTS grouping upgrades the user code of present networks node A.Here get Δ t=2ts+2tp, ts is CTS grouping or RTS packet delivery time, tp is a wireless signal from the node that sends the RTS grouping is sending node, and being transferred to the destination node that the RTS grouping need be sent to is receiving node, or is transferred to the propagation delay that sending node experiences from receiving node.
B.3 the predetermined thresholding signal to noise ratio SIRp of the reception control grouping signal to noise ratio SIRs that step is obtained in b.1 and network compares, and the data bit transmission error probability that channel coding/decoding scheme, modulation scheme and the receiver that SIRp is adopted by network node can allow is definite; If SIRs＜SIRp, then b.1 network node A enters step; Otherwise, network node A calculates redundant signal to noise ratio SIRa, SIRa=SIRs-SIRp, b.1 receive the value PT of transmitting power field in the control grouping according to step, the transmitting power of determining present networks node A is PT-f (SIRa), f (x) representative function mapping relations, the radius that the value of f (x) and the mapping relations between the x are jumped coverage by noise power in the network and network node average is determined.If represent antenna gain between the transceiver with K, R represents the radius of the average jumping coverage of network node, and W represents the noise power in the network, then f (x)=WR
η/ Kx, η is the path attenuation index, so f (SIRa)=WR is arranged
η/ KSIRa;
B.4 the node transmitting power PT-f (SIRa) that b.3 determines with the step node that sends the RTS grouping in b.1 to step sends CTS and divides into groups; The source address field of CTS grouping is inserted the address of network node A, and DAF destination address field is inserted the address of node of the b.1 middle RTS of the transmission grouping of step, and the transmitting power field is inserted the node transmission power level PT-f (SIRa) that b.3 step is determined;
B.5 after the b.1 middle node that sends the RTS grouping of step is received the CTS grouping, use the transmitting power that the transmitting power field is determined in the user code of this node and the CTS grouping, send packet to network node A, after network node A received packet, the node that sends the RTS grouping to step in b.1 sent the ACK grouping.Described access control method for distributed CDMA network medium with controllable power, the spreading code collocation method that it adopts is: network disposes Ns spreading code altogether, one of them spreading code is as public spreading code, be called for short common code, this spreading code is used for sending the control grouping, for each network node in common knowledge; All the other Ns-1 spreading code is called for short user code as user's spreading code, is used to send packet; Network node is configured as common code with spreading code when initialization, the while is selected at random and sets a user code as this node initial user sign indicating number, and network node can upgrade this node user code as required; The rule that network node upgrades this node user code is: if the control that receives grouping is the RTS grouping, and this node address is identical with destination node address in the RTS grouping, then this node user code is updated to RTS divide into groups in the user code of source node; Otherwise this node user code still remains this node initial user sign indicating number.
In conjunction with the application specific embodiments of the invention that Fig. 1 provides, further set forth operation principle of the present invention.A, B, four network nodes of C, D are arranged among the figure, and node A will carry out message transmission with Node B, and A is a sending node, and B is a receiving node.R is the radius that network node average is jumped coverage.
1, is the network node configures initiation parameter.Before the network node access channel is initiated message transmission, need carry out initialization to network node, mainly comprise following content:
A. for A, B, four network nodes of C, D distribute a unique physical address that is different from other nodes or ID sign respectively, be referred to as node address, be designated as: A
1, B
1, C
1, D
1
B. be that A, B, four network nodes of C, D are set Initial Trans Pp.Satisfy functional relation Pp=f (SIRp) between the thresholding signal to noise ratio SIRp that node Initial Trans Pp and network are scheduled to, f (x) representative function mapping relations, the radius that the value of f (x) and the mapping relations between the x are jumped coverage by noise power in the network and network node average is determined.If represent antenna gain between the transceiver with K, R represents the radius of the average jumping coverage of network node, and W represents the noise power in the network, and f (x)=WR is then arranged
η/ Kx, wherein η is the path attenuation index, so the node Initial Trans is Pp=f (SIRp)=WR
η/ KSIRp.The data bit transmission error probability that channel coding/decoding scheme, modulation scheme and the receiver that SIRp is adopted by network node can allow is determined.
C. be A, B, four initial spreading codes of network node configures of C, D.Use Distributed C DMA network of the present invention and dispose Ns spreading code l altogether
1, l
2..., l
Ns, Ns is a positive integer, selected l
NsAs public spreading code, be called for short common code, in common knowledge for each network node, be used for network node and send or receive the control grouping; All the other Ns-1 spreading code is called for short user code as user's spreading code, is used for network node and sends or receive packet.Through after the initialization, the initial user sign indicating number of node A, B, C, D configuration is respectively l
1, l
2, l
3, l
4
D. set various identification code and be used to represent various control groupings, represent the RTS grouping, 01 expression CTS grouping, 10 expression ACK groupings with 00.
2. use the distributed CDMA network medium with controllable power access control that the present invention proposes, when network node A need be when network node B sends packet, the cut-in method of execution is divided into following a few step:
The first step: sending node A from this node etc. take out packet the packet queue to be sent, according to the destination address B in the packet
1, determine that receiving node is destination address B in this packet
1The Node B of pointing to.
Second step: sending node A uses common code l
NsSend request to receiving node B and send the RTS grouping, the type field of RTS grouping inserts 00, and source address field is inserted A
1, source node user code field is inserted l
1, DAF destination address field is inserted B
1, the transmitting power field is inserted sending node A and is sent the RTS employed transmitting power PT that divides into groups, PT=Pp, Pp=WR
η/ KSIRp is the network node initial transmission power, and SIRp is the predetermined thresholding signal to noise ratio of network.Sending node A picks up counting, and enters six steps of step the.
The 3rd step: receiving node B uses common code l
NsReceive and despreading control grouping, and obtain the signal to noise ratio SIRs of RTS grouping by statistics; According to the value 00 that receives type field in the control grouping, judge whether receive the control grouping is the RTS grouping, and according to the value B that receives control grouping DAF destination address field
1, judging that the address of this node B is identical with destination address, receiving node B takes out the user code l of source node in the RTS grouping
1Upgrade the selected user code of this receiving node B.Meanwhile, network node C uses common code l
NsReceive and despreading control grouping, and obtain the signal to noise ratio SIRs of RTS grouping by statistics; According to the value 00 that receives type field in the control grouping, judge whether receive the control grouping is the RTS grouping, and according to the value B that receives control grouping DAF destination address field
1, judging that the address of this node B is different with destination address, node C judges channel busy, postpones Δ t=2ts+2tp after the time, reuses common code l
NsReceive and despreading control grouping, and make respective handling.At this moment, node D also uses common code l
NsReception and despreading control grouping, still far away apart from node A owing to node D, be in one of node A and jump outside the coverage, can't receive the RTS grouping that node A sends, so node D is left intact continuation use common code l
NsReceive and despreading control grouping.
The 4th step: the predetermined thresholding signal to noise ratio SIRp of the RTS grouping signal to noise ratio SIRs that receiving node B obtains step 3 and network compares, if SIRs＜SIRp, then receiving node B does not send clear to send CTS to sending node A and divides into groups, and enters step 3; Otherwise receiving node B calculates redundant signal to noise ratio SIRa, SIRa=SIRs-SIRp, and according to the value PT of transmitting power field in the described RTS of the step 2 grouping, the transmitting power of determining this receiving node B is PT-f (SIRa)=PT-WR
η/ KSIRa.
The 5th step: the transmitting power PT-f (SIRa) that receiving node B determines with step 4 sends the CTS grouping to sending node A; The type field of CTS grouping inserts 01, and source address field is inserted B1, and DAF destination address field is inserted A
1, the transmitting power field is inserted the transmission power level PT-f (SIRa) of the definite receiving node B of step 5.Meanwhile, network node D uses common code l
NsReceive and despreading control grouping, and obtain the signal to noise ratio SIRs of RTS grouping by statistics; According to the value 01 that receives type field in the control grouping, judge that receiving the control grouping is to be the CTS grouping, node D reuses common code l
NsReceive and despreading control grouping.
The 6th step:, then enter step 7, otherwise sending node A enters nine steps of step the if sending node A receives the CTS grouping that receiving node B sends at Tt=2ts+2tp in the time.
The 7th step: the value of transmitting power field during the CTS that sending node A receives according to step 6 divides into groups, determine that this sending node A is subsequently when receiving node B sends packet, employed transmitting power, the value of this transmitting power are got the value of transmitting power field in the CTS grouping.
The 8th step: sending node A uses the user code l of this node A
1The transmitting power of determining with step 7 sends packet to receiving node B, and receiving node B uses user code l
1Receive and the despread data grouping, send to sending node A then and confirm the ACK grouping.
The 9th step: sending node A increases dt with transmitting power, and the value of transmitting power field in the RTS grouping increased dt, when repeating to send number of times, accumulative total allows to repeat to send number of times Rm less than maximum, and when transmitting power allows transmitting power smaller or equal to maximum, sending node A sends a RTS grouping to receiving node B again with the transmitting power that increases behind the dt, and return step 6, otherwise, with receiving node B as unreachable processing.If represent the maximum transmitting power that allows with Pm, then maximum allows to repeat to send between number of times and the transmitting power increase and decrease amplitude dt to satisfy relation: Rm * dt=Pm-Pp, and Pp is the network node Initial Trans, and Rm is a positive integer.
The tenth step: receiving node B is unreachable, and sending node A joins this node with packet and waits in the transmission packet queue, reenters step 1.
The above only is preferred embodiment of the present invention, in order to restriction the present invention, not it should be appreciated by those skilled in the art that under the situation that does not break away from the spirit and principles in the present invention, can carry out various other change, replacement and interpolations.Therefore, within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. access control method for distributed CDMA network medium with controllable power, comprise two parts: the cut-in method when cut-in method when network node has packet to send and network node do not have packet to send, it is characterized in that cut-in method is when network node has packet to send:
A.1 sending node A from this node etc. take out packet the packet queue to be sent, according to the destination address in the packet, determine that receiving node is the Node B that destination address is pointed in this packet;
A.2 sending node A uses common code to send request to receiving node B and sends the RTS grouping, the RTS grouping includes type field, source address field, source node user code field, DAF destination address field, and transmitting power field, wherein type field is inserted and is represented that this is grouped into the identification code of RTS grouping, source address field is inserted the address of sending node A, source node user code field is inserted the user code of sending node A, DAF destination address field is inserted the address of receiving node B, the transmitting power field is inserted sending node A and is sent the RTS employed transmitting power PT that divides into groups, PT=Pp, Pp is the network node initial transmission power, satisfy functional relation Pp=f (SIRp) between the thresholding signal to noise ratio SIRp that node Initial Trans Pp and network are scheduled to, wherein, f (x) representative function mapping relations, the radius that the value of f (x) and the mapping relations between the x are jumped coverage by noise power in the network and network node average is determined; The data bit transmission error probability that channel coding/decoding scheme, modulation scheme and the receiver that SIRp is adopted by network node can allow is determined; Sending node A picks up counting, and enters step a.6;
A.3 the RTS that receiving node B use common code receives and despreading sending node A sends divides into groups, and obtains the signal to noise ratio SIRs that RTS divides into groups by statistics, and the user code that takes out source node in the RTS grouping upgrades the selected user code of this receiving node B;
A.4 the predetermined thresholding signal to noise ratio SIRp of RTS grouping signal to noise ratio SIRs that a.3 step is obtained and network compares, if SIRs＜SIRp, then receiving node B does not send clear to send CTS grouping to sending node A, enters step a.3; Otherwise receiving node B calculates redundant signal to noise ratio SIRa, SIRa=SIRs-SIRp, and according to the value PT of transmitting power field in the a.2 described RTS of the step grouping, the transmitting power of determining this receiving node B is PT-f (SIRa);
A.5 receiving node B sends the CTS grouping with the a.4 definite transmitting power PT-f (SIRa) of step to sending node A; The CTS grouping includes type field, source address field, DAF destination address field and transmitting power field, wherein type field is inserted and is represented that this is grouped into the identification code of CTS grouping, source address field is inserted the address of receiving node B, DAF destination address field is inserted the address of sending node A, and the transmitting power field is inserted the a.5 transmission power level PT-f (SIRa) of definite receiving node B of step;
If a.6 sending node A receives the CTS grouping that receiving node B sends at Tt in the time, then enter step a.7, otherwise a.9 sending node A enters step;
A.7 the value of transmitting power field in the CTS grouping that a.6 receives according to step of sending node A, determine that this sending node A is subsequently when receiving node B sends packet, employed transmitting power, the value of this transmitting power are got the value of transmitting power field in the CTS grouping;
A.8 sending node A uses the user code of this node A and the a.7 definite transmitting power of step to send packet to receiving node B, the user code that receiving node B uses step to determine in a.3 receives and the despread data grouping, sends to sending node A then and confirms the ACK grouping;
A.9 sending node A increases dt with transmitting power, and the value of transmitting power field in the RTS grouping increased dt, when repeating to send number of times, accumulative total allows to repeat to send number of times Rm less than maximum, and when transmitting power allows transmitting power smaller or equal to maximum, sending node A sends a RTS grouping to receiving node B again with the transmitting power that increases behind the dt, and return step a.6, otherwise, with receiving node B as unreachable processing;
A.10 receiving node B is unreachable, and sending node A joins this node with packet and waits in the transmission packet queue, reenters step a.1;
When network node did not have packet to send, cut-in method was:
B.1 network node A uses common code to receive and despreading control grouping, and is SIRs by the signal to noise ratio that statistics obtains receiving the control grouping; According to the value that receives type field in the control grouping, judge that whether receive the control grouping is the RTS grouping, if the control that receives is grouped into the RTS grouping, then enter step b.2, otherwise b.1 network node A re-executes step;
Whether the address of b.2 judging present networks node A is identical with destination address in the RTS grouping, if inequality, then network node A judges channel busy, postpones Δ t after the time, re-executes step b.1; Otherwise the user code that takes out source node in the RTS grouping upgrades the user code of present networks node A;
B.3 the predetermined thresholding signal to noise ratio SIRp of the reception control grouping signal to noise ratio SIRs that step is obtained in b.1 and network compares, and the data bit transmission error probability that channel coding/decoding scheme, modulation scheme and the receiver that SIRp is adopted by network node can allow is definite; If SIRs＜SIRp, then b.1 network node A enters step; Otherwise, network node A calculates redundant signal to noise ratio SIRa, SIRa=SIRs-SIRp, b.1 receive the value PT of transmitting power field in the control grouping according to step, the transmitting power of determining present networks node A is PT-f (SIRa), f (x) representative function mapping relations, the radius that the value of f (x) and the mapping relations between the x are jumped coverage by noise power in the network and network node average is determined;
B.4 the node transmitting power PT-f (SIRa) that b.3 determines with the step node that sends the RTS grouping in b.1 to step sends CTS and divides into groups; The source address field of CTS grouping is inserted the address of network node A, and DAF destination address field is inserted the address of node of the b.1 middle RTS of the transmission grouping of step, and the transmitting power field is inserted the node transmission power level PT-f (SIRa) that b.3 step is determined;
B.5 after the b.1 middle node that sends the RTS grouping of step is received the CTS grouping, use the transmitting power that the transmitting power field is determined in the user code of this node and the CTS grouping, send packet to network node A, after network node A received packet, the node that sends the RTS grouping to step in b.1 sent the ACK grouping.
2. access control method for distributed CDMA network medium with controllable power according to claim 1, it is characterized in that the spreading code collocation method that adopts is: network disposes Ns spreading code altogether, one of them spreading code is as public spreading code, be called for short common code, this spreading code is used for sending the control grouping, for each network node in common knowledge; All the other Ns-1 spreading code is called for short user code as user's spreading code, is used to send packet; Network node is configured as common code with spreading code when initialization, the while is selected at random and sets a user code as this node initial user sign indicating number, and network node can upgrade this node user code as required; The rule that network node upgrades this node user code is: if the control that receives grouping is the RTS grouping, and this node address is identical with destination node address in the RTS grouping, then this node user code is updated to RTS divide into groups in the user code of source node; Otherwise this node user code still remains this node initial user sign indicating number.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR2761838B1 (en) * | 1997-04-03 | 1999-04-30 | Alsthom Cge Alcatel | METHOD FOR CONTROLLING THE TRANSMISSION POWER OF TERMINALS IN A CELLULAR NETWORK OF CDMA TYPE, BASE STATION AND BASE STATION CONTROLLER USING THE SAME |
| CN1135745C (en) * | 2000-03-23 | 2004-01-21 | 华为技术有限公司 | Forward power saturation protecting method and power controller for CDMA communication system |
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