CN101145832A - A framing method based on time division synchronization code division multi-address and mobile self-organization network fusion - Google Patents
A framing method based on time division synchronization code division multi-address and mobile self-organization network fusion Download PDFInfo
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Abstract
The invention discloses an integration framing method of TD-SCDMA and a mobile ad hoc network, which subdivides a terminal communication state into five states, such as a cellular network state, an ad hoc state, a two-network parallel network state, a gateway state, and a gateway state under the cellular network communication. The invention designs the sign bit of the expression state and the related framing structure, and also defines three different time slots types. The switchover of varies states and the flaming flow comprise the following steps and are carried out in sequence: 1), startup; 2), initialing state; 3), mobile state; 4)h, cellular state; 5), ad hoc state; 6), two-network parallel communication state; 7), gateway state. The invention carries out the Ad Hoc communication by utilizing the idle time slot existed in the TD-SCDMA communication, designs the five communication states of the terminal in the two networks, the related flaming structure and the communication flow, and realizes the integration, co-existence and free switchover of the two networks and the function of time slot resource dynamic assignment. The invention is able to effectively expand the coverage of the cellular network.
Description
Technical field
The present invention relates to moving communicating field, is a kind of new method that TD-SCDMA and Ad hoc are merged mutually, has proposed corresponding frame structure, to realize this coexistence mechanism.
Background technology
TD-SCDMA proposes and obtains the 3G wireless communication standard that ITU passes through by China Wireless Telecommunication Standar tissue (CWTS).Itself and universal terrestrial radio access time division duplex (UTRA TDD) have been formed the TDD-CDMA working method in the 3G system.TD-SCDMA combines TDMA and two kinds of basic transmission modes of CDMA flexibly,, and adopted advanced technologies such as smart antenna, uplink synchronous, software radio, joint-detection, thus formed unique air interface technologies.The thus obtained technical advance of TD-SCDMA shows the following aspects: the ability of spectral flexibility and supporting cellular net, availability of frequency spectrum height, applicability are strong.In addition because China has the independent intellectual property right of TD-SCDMA system, so that it has equipment cost is low, the systematic function price is than high characteristics.Simultaneously provide aspects such as long-term technical support and technological service in the network planning, system design, engineering construction and for domestic operator, it also has irreplaceable advantage, can save system's construction investment and operation cost greatly.
Though the TD-CDMA system has above-mentioned advantage, there are some intrinsic deficiencies equally, mainly be the rate travel and the coverage of terminal.This is owing to adopted the discontinuous transmission means of multi-slot, causes under high velocity environment anti-rapid fading and anti-Doppler effect capability poorer than the FDD mode of transmission continuously.And mobile ad-hoc network (being Ad hoc network) is a kind of special peer-to-peer network.It has characteristics such as no center, self-organizing, multi-hop route, need not any network facilities of laying in advance and just can realize fast automatic networking.Therefore can be used as the expansion and the access means of existing many communication networks.Ad hoc network is used for the coverage that cellular mobile communication networks can be expanded cellular network effectively, improves the capacity of cellular system, the adjacent Zone of balance reduces base station number, reduces power consumption of mobile terminals.
Summary of the invention
Technical problem: the framing method that the object of the present invention is to provide a kind of TD SDMA and mobile ad-hoc network to merge, with on the basic basis of invariable of frame that keeps the TD-SCDMA system, make the TD-SCDMA system realize the function of Ad hoc network, thereby realize two kinds of network integrations, coexistence, freely switch and the functions such as dynamic assignment of time interval resource.
Technical scheme: the framing method that TD SDMA of the present invention and mobile ad-hoc network merge is subdivided into five kinds of gateway status under Cellular Networks state, state of self-organization, two net parallel communications states, gateway status, the cellular network communication with the communications status of terminal, the flag bit of design expression state, corresponding frame structure, and defined three kinds of different time slot types, and the switching of various states and framing flow process may further comprise the steps and undertaken by described order:
1) start: when starting up of terminal, at first catch the descending synchronous code of cell downlink pilot time slot by cell search process, with realize with current area synchronously, obtain to insert the condition of Cellular Networks,
2) initial condition: if when inserting successfully, terminal is in the Cellular Networks state, and all business time-slots all are used for cellular network communication, keeps traditional TD SDMA frame structure constant, under this kind state with peak nest subframe composition superframe.If access failure or do not cover following time at honeycomb, terminal then TSN time slot corresponding in 10 honeycomb subframes is formed the superframe of 1 50ms, wherein N=1,6, so that realize ad hoc network communication by the access way of time-division multiple access, and the search mobile ad hoc network, with reservation control/transmission time slot on superframe, if preengage successfully, then terminal becomes the activation node of mobile ad hoc network, is in state of self-organization, at this moment all reservation successful service time slots all are used for mobile ad hoc network communication
3) mobile status: because mobility, terminal under the Cellular Networks state might shift out cellular coverage, at this moment terminal is transferred and will be formed superframe in 10 honeycomb subframes, be convenient to realize ad hoc network communication by the access way of time-division multiple access, and the search mobile ad hoc network, with reservation control/transmission time slot on superframe, if preengage successfully, then terminal becomes the activation node of mobile ad hoc network, is in state of self-organization; And when self-organization nodes moves in the cellular coverage, the superframe of 50ms can be reverted back 10 honeycomb subframes, and insert Cellular Networks, but the SOT state of termination sign remains unchanged, still be state of self-organization,
4) honeycomb state: when the cellular terminal of free time is initiated cellular services or detect at oneself beep-page message on the paging broadcast channel, need to determine institute's distributed time slot quantity and position according to dynamic channel assignment scheme and professional type that network adopted, if when initiating the self-organizing business or receiving the self-organization network call signaling, terminal will be formed superframe in 10 honeycomb subframes, and in self-organization network, utilize on the subframe idle time slot as its control/transmission time slot, thereby realize inserting simultaneously two networks, carry out the communication of another kind of network, terminal changes into the parallel state of two nets; If what receive is that two nets are transmitted request, terminal also need insert two networks simultaneously.This moment terminal will form superframe in 10 honeycomb subframes, and in self-organization network, utilize on the subframe idle time slot as its control/transmission time slot, change into gateway status,
5) state of self-organization: when the self-organization nodes of free time is initiated the self-organizing business or is received the self-organization network call signaling, the control that terminal has preferentially been preengage on superframe/transmission time slot transmitting data; If need carry out high speed data transfer, terminal can be preengage new transmission time slot in the idle time slot on superframe temporarily, and end of transmission promptly discharges; If when initiating cellular services or detecting at oneself beep-page message, terminal is according to required transmission rate and the dynamic channel assignment scheme that is adopted, determine the transfer of next step state and the conversion of frame structure, just when transmission rate when 144 kilobits/second are following, terminal inserts two networks simultaneously, subframe structure in the superframe is transformed into subframe structure under the two net parallel communications states by the subframe structure under the state of self-organization, flag bit changes into the parallel state of two nets, carry out the communication of Cellular Networks, and when transmission rate is higher than 144 kilobits/second, terminal withdraws from mobile ad hoc network, the superframe of 50ms reverts back 10 honeycomb subframes, subframe structure keeps traditional TD SDMA subframe structure constant, flag bit converts the Cellular Networks state to, be exclusively used in cellular communication, if what receive is that two nets are transmitted request, terminal also need insert two networks simultaneously, subframe structure in the superframe is transformed into subframe structure under the gateway status by the subframe structure under the state of self-organization, flag bit changes into gateway status
6) two net parallel communications states: when two net parallel terminals are finished communication, terminal node becomes two net nodes, still keep the parallel state of two nets, subframe structure in the superframe is constant, so that terminal is transmitted and two net parallel communicationss, and between two kinds of networks, freely switch, when need are finished self-organizing business or the low speed cellular services below 144 kilobits/second, node can utilize and oneself insert two network advantages simultaneously, directly communicate, and when transmission rate is higher than 144 kilobits/second, terminal need withdraw from self-organization network and be exclusively used in cellular communication, the superframe of 50ms reverts back 10 honeycomb subframes, and subframe structure keeps traditional TD SDMA frame structure constant, and flag bit is directly changed into the Cellular Networks state, and in the time need finishing two net forwarding business, terminal only needs status indication is become gateway status, and subframe structure need not to change and just can directly transmit
7) gateway status: gateway node is when transmitting, detect cellular pages message at oneself, forwarding rate can be reduced, subframe structure in the superframe is transformed into subframe structure under the two net parallel communications states by the subframe structure under the state of self-organization, to carry out cellular communication simultaneously, terminal is in the gateway status under the cellular network communication, when cellular communication finishes, terminal is return gateway status, proceeding two nets transmits, also be through with if transmit communication, terminal is directly return the parallel state of two nets, waits for the initiation of the communication of next time.
The corresponding subframe structure of defined five kinds of different conditions is as follows:
1) subframe structure under the Cellular Networks state
The subframe structure that refers to terminal keeps traditional TD SDMA frame structure constant,
2) subframe structure under the state of self-organization
Time slot TSO still is used to receive the descending pilot frequency and the cellular pages signal of Cellular Networks in the subframe structure of finger terminal to the DwPTS part; and time slot TS1 is used for ad hoc network communication to time slot TS6; and the burst of each self-organization network ruton time slot is by the synchronizing sequence of 64 chips, the training sequence of 144 chips, the data sequence of two 320 chips; deaden between the protection of 16 chips
3) subframe structure under the two net parallel communications states
Time slot TS1, time slot TS6 are used for cellular communication in the subframe structure of finger terminal, and time slot TS2 is used for ad hoc network communication to time slot TS5,
4) subframe structure under the gateway status
Time slot TS3, time slot TS4 are used for ad hoc network communication in the subframe structure of finger terminal, and time slot TS1, time slot TS2, time slot TS5, time slot TS6 are used for cellular communication, transmit the self-organizing signal,
5) subframe structure under the gateway status under the cellular network communication
Time slot TS1, time slot TS2, time slot TS5, time slot TS6 are used for cellular communication in the subframe structure of finger terminal, wherein time slot TS1, time slot TS6 are used for communicating by letter of gateway node self and Cellular Networks, time slot TS2, time slot TS5 are used to transmit the ad hoc network communication signal, and time slot TS3, time slot TS4 are exclusively used in ad hoc network communication.
Time slot in the superframe can be divided into following three kinds by function:
1) control/transmission time slot: obtain and keep always in Ad hoc network time reservation by terminal, to obtain the ad hoc network communication ability, it has control channel that sends control signaling and the transmission channel that transmits low speed data, is whether distinguishing terminal is the sign that self-organizing network activates node
2) transmission time slot is to preengage by activating node temporarily, only has transmission channel, is exclusively used in high speed data transfer and asymmetric Packet Service,
3) the public broadcasting time slot is to be used by the un-activation node, is specifically designed to the transmission of un-activation node IP and the reception of self-organizing network call signaling.
Beneficial effect: the framing method that the present invention proposes has carried out sufficient utilization to the idle time slot of terminal communication frame, has increased the coverage of new communication pattern with the expansion cellular network, improves the capacity of cellular system, and has improved the average communication speed of system.
This method has been made certain modification on the frame structure of TD-SCDMA communication terminal, come on the TD-SCDMA terminal, to realize the communication function of Ad hoc network with the notion of superframe, so both guaranteed the complete compatibility of terminal frame structure when TD-SCDMA communicates by letter, also realize the requirement of each terminal point-to-point communication in Ad hoc network, also can realize the forwarding of terminal between access communications or two is netted simultaneously on two networks simultaneously.
This method has just been done new definition to the idle time slot of terminal communication frame, as long as terminal is carried out a spot of modification, other partial functions of TD-SCDMA system and whole communication signalings do not need to make any modification, thereby can realize Ad hoc communication with the cost of minimum.
Description of drawings
Fig. 1 is the frame assumption diagram under each communications status of terminal in the inventive method, Fig. 1 a is a Cellular Networks status frames structural representation, Fig. 1 b is an Ad hoc status frames structural representation, Fig. 1 c is two net parallel communications status frames structural representations, Fig. 1 d is a gateway status frame structure schematic diagram, Fig. 1 e is the gateway status frame structure schematic diagram under the cellular network communication
Fig. 2 is the communications status transition diagram of terminal,
Fig. 3 is the flow chart that each communications status switches in the inventive method, and Fig. 3 a is the system initialization flow process, and the flow chart that Fig. 3 b switches for the Cellular Networks state, the flow chart that Fig. 3 c switches for the Adhoc state, Fig. 3 d are the flow chart that the parallel state of two nets switches.
Embodiment
The framing method that TD SDMA of the present invention and mobile ad-hoc network merge is subdivided into five kinds of gateway status under Cellular Networks state, state of self-organization, two net parallel communications states, gateway status, the cellular network communication with the communications status of terminal, the flag bit of design expression state, corresponding frame structure, and defined three kinds of different time slot types, and the switching of various states and framing flow process may further comprise the steps and undertaken by described order:
1) start: when starting up of terminal, at first catch the descending synchronous code of cell downlink pilot time slot by cell search process, with realize with current area synchronously, obtain to insert the condition of Cellular Networks,
2) initial condition: if when inserting successfully, terminal is in the Cellular Networks state, and all business time-slots all are used for cellular network communication, and its frame structure keeps traditional TD-SCDMA frame structure constant shown in Fig. 1 (a), under this kind state with peak nest subframe composition superframe.If access failure or do not cover following time at honeycomb, terminal is transferred TSN (N=1 corresponding in 10 honeycomb subframes, 6) time slot is formed the superframe of 1 50ms, and each subframe structure in the superframe is realized Ad hoc communication so that press the access way of TDMA shown in Fig. 1 (b), and search mobile ad hoc network, with reservation control/transmission time slot on superframe, if preengage successfully, then terminal becomes
Activation node for mobile ad hoc network is in state of self-organization, and at this moment all reservation successful service time slots all are used for mobile ad hoc network communication,
3) mobile status: because mobility, terminal under the Cellular Networks state might shift out cellular coverage, at this moment terminal is transferred and will be formed superframe in 10 honeycomb subframes, be convenient to realize Ad hoc communication by the access way of TDMA, and the search mobile ad hoc network, with reservation control/transmission time slot on superframe, if preengage successfully, then terminal becomes the activation node of mobile ad hoc network, is in state of self-organization; And when self-organization nodes moves in the cellular coverage, the superframe of 50ms can be reverted back 10 honeycomb subframes, and insert Cellular Networks, but the SOT state of termination sign remains unchanged, still be state of self-organization,
4) honeycomb state: when the cellular terminal of free time is initiated cellular services or detect at own beep-page message on the paging broadcast channel, need determine institute's distributed time slot quantity and position according to the dynamic channel assignment scheme that network adopted and the type of business.If when initiating the self-organizing business or receiving the self-organization network call signaling, terminal will be formed superframe in 10 honeycomb subframes, each subframe structure in the superframe is shown in Fig. 1 (c), and in self-organization network, utilize on the subframe idle time slot as its control/transmission time slot, thereby realize inserting simultaneously two networks, carry out the communication of another kind of network, terminal changes into the parallel state of two nets.If what receive is that two nets are transmitted request, terminal also need insert two networks simultaneously.This moment terminal will form superframe in 10 honeycomb subframes, each subframe structure in the superframe shown in Fig. 1 (d), and in self-organization network, utilize on the subframe idle time slot as its control/transmission time slot, change into gateway status,
5) state of self-organization: when the self-organization nodes of free time is initiated the self-organizing business or is received the self-organization network call signaling, the control that terminal has preferentially been preengage on superframe/transmission time slot transmitting data; If need carry out high speed data transfer, terminal can be preengage new transmission time slot in the idle time slot on superframe temporarily, and end of transmission promptly discharges; If when initiating cellular services or detecting at oneself beep-page message, terminal is according to required transmission rate and the dynamic channel assignment scheme that is adopted, determine the transfer of next step state and the conversion of frame structure, just when transmission rate when 144kbits/s is following, terminal inserts two networks simultaneously, subframe structure shown in Fig. 1 in the superframe (b) is transformed to the subframe structure shown in Fig. 1 (c), flag bit changes into the parallel state of two nets, carry out the communication of Cellular Networks, and when transmission rate is higher than 144kbits/s, terminal withdraws from mobile ad hoc network, the superframe of 50ms reverts back 10 honeycomb subframes, and subframe structure is shown in Fig. 1 (a), and flag bit converts the Cellular Networks state to, be exclusively used in cellular communication, if what receive is that two nets are transmitted request, terminal also need insert two networks simultaneously, and the subframe structure shown in Fig. 1 in the superframe (b) is transformed to the subframe structure shown in Fig. 1 (d), flag bit changes into gateway status
6) two net parallel communications states: when two net parallel terminals are finished communication, terminal node becomes two net nodes, still keep the parallel state of two nets, subframe structure in the superframe is constant, so that terminal is transmitted and two net parallel communicationss, and between two kinds of networks, freely switch, when need are finished self-organizing business or the low speed cellular services below the 144kbits/s, node can utilize and oneself insert two network advantages simultaneously, directly communicate, and when transmission rate is higher than 144kbits/s, terminal need withdraw from self-organization network and be exclusively used in cellular communication, the superframe of 50ms reverts back 10 honeycomb subframes, and subframe structure is shown in Fig. 1 (a), and flag bit is directly changed into the Cellular Networks state.And in the time need finishing two net forwarding business, terminal only needs status indication is become gateway status, and subframe structure need not to change and just can directly transmit,
7) gateway status: gateway node is when transmitting, detect the cellular pages message at oneself, forwarding rate can be reduced, the subframe structure shown in Fig. 1 in the superframe (b) is transformed to the subframe structure shown in Fig. 1 (c), to carry out cellular communication simultaneously, terminal is in the gateway status under the cellular network communication, and when cellular communication finished, terminal was return gateway status, proceeding two nets transmits, also be through with if transmit communication, terminal is directly return the parallel state of two nets, waits for the initiation of the communication of next time.
The corresponding subframe structure of defined five kinds of different conditions is as follows
1) subframe structure under the Cellular Networks state
The subframe structure that refers to terminal keeps traditional TD-SCDMA frame structure constant shown in Fig. 1 (a).
2) subframe structure under the Ad hoc state
The subframe structure that refers to terminal is shown in Fig. 1 (b), and wherein TS0 still is used to receive the descending pilot frequency and the cellular pages signal of Cellular Networks to the DwPTS part, and time slot TS1 is used for Ad hoc to TS6 and communicates by letter.And the burst of each Adhoc time slot is deadened between the protection of 16chips by the synchronizing sequence of 64chips, the training sequence of 144chips, the data sequence of two 320chips.
3) subframe structure under the two net parallel communications states
The subframe structure that refers to terminal is shown in Fig. 1 (c), and time slot TS1, TS6 are used for TD-SCDMA communication, and time slot TS2 is used for Ad hoc communication to TS5.
4) subframe structure under the gateway status
The subframe structure that refers to terminal is shown in Fig. 1 (d), and time slot TS3, TS4 are used for Ad hoc communication.Time slot TS1, TS2, TS5, TS6 are used for cellular communication, transmit Ad hoc signal.
5) subframe structure under the gateway status under the cellular network communication
The subframe structure that refers to terminal is shown in Fig. 1 (e), and time slot TS1, TS2, TS5, TS6 are used for cellular communication.Wherein TS1, TS6 are used for communicating by letter of gateway node self and Cellular Networks, and TS2, TS5 are used to transmit Ad hoc signal.And time slot TS3, TS4 are exclusively used in Ad hoc communication.
Time slot in the superframe can be divided into following three kinds by function:
1) control/transmission time slot: obtain and maintenance always by terminal reservation when inserting Ad hoc, to obtain Ad hoc communication capacity.It has control channel that sends control signaling and the transmission channel that transmits low speed data, is whether distinguishing terminal is the sign that Ad hoc activates node.
2) transmission time slot is to preengage by activating node temporarily, only has transmission channel, is exclusively used in high speed data transfer and asymmetric Packet Service.
3) the public broadcasting time slot is to be used by the un-activation node, is specifically designed to the transmission of un-activation node IP and the reception of Ad hoc call signaling.
Cardinal principle of the present invention is to utilize the idle time slot in the cellular communication to carry out Ad hoc communication simultaneously, to realize two net coexistences.Because starting point of the present invention is Ad hoc network and TD-SCDMA network are combined, to realize the coverage of expansion cellular network, improve the capacity of cellular system, so cellular network communication should have priority in two Netcoms letter.In addition, the present invention is divided into gateway status under Cellular Networks state, Adhoc state, two net parallel communications states, gateway status, the cellular network communication with the communications status of terminal.Introduce these 5 kinds of states and corresponding frame structure below respectively
(1) Cellular Networks state
Refer to that terminal only communicates in the TD-SCDMA network, realization be general T D-SCDMA termination function.Its frame structure keeps traditional TD-SCDMA frame structure constant shown in Fig. 1 (a).
(2) Ad hoc state
Refer to that terminal only communicates in Ad hoc network, but should keep inserting at any time the ability (when moving into the Cellular Networks coverage) of Cellular Networks, realization be common Ad hoc network termination function.Its frame structure is shown in Fig. 1 (b), and wherein TS0 still is used to receive the descending pilot frequency and the cellular pages signal of Cellular Networks to DwPTS part, and time slot TS1 is used for Ad hoc to TS6 and communicates by letter.And the burst of each Ad hoc time slot is deadened between the protection of 16chips by the synchronizing sequence of 64chips, the training sequence of 144chips, the data sequence of two 320chips.
(3) two net parallel communications states
Finger is when initiating another Network or detecting the beep-page message of another network, and the terminal that is in Cellular Networks or Adhoc state inserts two networks simultaneously, communicates.Its realization be that two nets are communicated by letter but the function do not transmitted simultaneously.Its frame structure is shown in Fig. 1 (c), and time slot TS1, TS6 are used for TD-SCDMA communication, and time slot TS2 is used for Ad hoc communication to TS5.
(4) gateway status
Refer to that terminal transmits between Ad hoc network and TD-SCDMA network, realization be that terminal is carried out the function that two nets are transmitted, be the significant state that two nets merge.Its frame structure is shown in Fig. 1 (d), and time slot TS3, TS4 are used for Ad hoc communication.Time slot TS1, TS2, TS5, TS6 are used for cellular communication, transmit Ad hoc signal.
(5) gateway status under the cellular network communication
Refer to that the terminal be in gateway status receives the TD-SCDMA call signaling, carry out cellular network communication, keep forwarding basic, low speed simultaneously, realization be the function of the net of two basic cellular network communication under forwarding.Its frame structure is shown in Fig. 1 (e), and time slot TS1, TS2, TS5, TS6 are used for cellular communication.Wherein TS1, TS6 are used for communicating by letter of gateway node self and Cellular Networks, and TS2, TS5 are used to transmit Ad hoc signal.And time slot TS3, TS4 are exclusively used in Ad hoc communication.
In order to guarantee the unification of frame structure, the Ad hoc network communication mode among the present invention still utilizes the general structure of TD-SCDMA frame, communicates to the idle component among the TS6 at business time-slot TS1.Simultaneously be no more than the requirement of 200ms about the voice communication unidirectional transmission time delay in order to satisfy ITU, the present invention with TSN corresponding in 10 subframes (N=1 ..., 6) and 1 superframe of time slot composition, the cycle is 50ms, with the access way realization Ad hoc communication of TDMA.So conveniently be in the terminal of various communications status, utilize situation by oneself time slot, find available idle time slot set, the reservation time slot carries out Ad hoc communication.
The time slot that terminal is preengage in Ad hoc network can be divided into following 3 kinds by function:
(1) control/transmission time slot
Obtain and maintenance always by terminal reservation when inserting Ad hoc, to obtain Ad hoc communication capacity.It has control channel that sends control signaling and the transmission channel that transmits low speed data, is whether distinguishing terminal is the sign that Ad hoc activates node.In order to be implemented in freely switching between each communications status, superframe Ts3, Ts4 are specifically designed to each terminal node reservation control/transmission time slot.
(2) transmission time slot
Be to preengage temporarily, only have transmission channel, be exclusively used in high speed data transfer and asymmetric Packet Service by activating node.Other four superframes that will be except that superframe Ts3, Ts4 among the present invention are specifically designed to the reservation application of transmission time slot.
(3) public broadcasting time slot
Be to use, be specifically designed to the transmission of un-activation node IP and the reception of Ad hoc call signaling by the un-activation node.It is made up of first time slot of Ts3, Ts4 superframe, and promptly each superframe has two public broadcasting time slots.
The inventive method utilizes GPS (Global Position System) time service slightly synchronous to realize Ad hoc the whole network, the transmitting-receiving time border of promptly clear and definite each node and each superframe.Preceding 64bit with the time slot burst structure makes the SYNC sequence into by data sequence simultaneously, to provide despreading required precise synchronization.When gateway node carries out two net forwardings, the flow matches unanimity of two networks need be made, stable forwarding could be realized.In order to reduce the complexity of Ad hoc access mechanism, the transmission capacity of a time slot of our regulation Ad hoc pattern is equivalent to 10 times under the honeycomb mode.Two net converting flow matching formulas are
N
Ad/P
Ad＝10*N
TD/P
TD
N wherein
Ad, N
TDBe respectively the transmission code channel number of Ad hoc and TD-SCDMA network, P
AdAnd P
TDFor being the spread processing factor of Ad hoc and TD-SCDMA network.
The present invention provides a kind of specific embodiment at this, is how to switch various states to introduce terminal node.
(1) when starting up of terminal, the descending synchronous code SYNC-DL of search cell descending pilot frequency time slot DwPTS at first, with realize with current area synchronously, obtain to insert the condition of Cellular Networks.
(2) if successfully search the descending synchronous code SYNC-DL of sub-district, terminal enters cell search process, selects suitable cell, and it is resident to finish the sub-district.At this moment terminal is in the Cellular Networks state, and business time-slot TS1 all is used for cellular communication to TS6.
(3) if search during less than the failure of descending synchronous code SYNC-DL or access procedure, terminal then search Adhoc network.By Ad hoc network being continued the monitoring of one-period, terminal can be understood its time slot and utilize information such as state, channel status, node address by the control channel of each neighbor node in the local domain, and finds noiseless available time slot set P thus.Terminal is preengage control/transmission time slot on P, become the activation node of Ad hoc.This moment, terminal was in Ad hoc state.At this moment business time-slot TS1 is used for Ad hoc communication to TS6.
(4) Ad hoc node keeps the search to community downlink synchronous code SYNC-DL always, so that in moving into cellular coverage the time, can insert Cellular Networks immediately.After Ad hoc node inserted Cellular Networks, as long as also there is not cellular services to need to realize, state was an Ad hoc state still just.Business time-slot TS1 also is used for Ad hoc communication to TS6.
(5) when the cellular terminal of free time is initiated cellular services or detect at own beep-page message, need determine institute's distributed time slot quantity and position according to the dynamic channel assignment scheme that network adopted and the type of business.If when initiating Ad hoc business or receiving Ad hoc call signaling, terminal is in Ad hoc network, the idle time slot that utilizes oneself is as its control/transmission time slot.Thereby insert two networks simultaneously, carry out the communication of another kind of network.Terminal changes into the parallel state of two nets.If what receive is that two nets are transmitted request, terminal also need insert two networks simultaneously, changes into gateway status.
(6) when the Ad of free time hoc node was initiated Ad hoc business or received Ad hoc call signaling, terminal was preferentially at the control of having preengage/transmission time slot transmitting data.If need carry out high speed data transfer, terminal can be preengage new transmission time slot temporarily, and end of transmission promptly discharges.If when initiating cellular services or detecting at own beep-page message, terminal determines the transfer of next step state according to required transmission rate and the dynamic channel assignment scheme that adopted.Just when transmission rate when 144kbits/s is following, terminal inserts two networks simultaneously, changes into the parallel state of two nets, carries out the communication of Cellular Networks.And when transmission rate was higher than 144kbits/s, terminal withdrawed from Ad hoc network switch and becomes the Cellular Networks state, was exclusively used in cellular communication.If what receive is that two nets are transmitted request, terminal also need insert two networks simultaneously, changes into gateway status.
(7) when two net parallel terminals were finished communication, terminal node became two net nodes, still kept the parallel state of two nets.Have only this node just may transmit and two net parallel communicationss, and between two kinds of networks, freely switch.When need were finished Ad hoc business or the low speed cellular services below the 144kbits/s, node can utilize and oneself insert two network advantages simultaneously, directly communicates.And when transmission rate was higher than 144kbits/s, terminal can withdraw from Ad hoc network-specific in cellular communication.It is directly changed into the Cellular Networks state.When need were finished two net forwarding business, terminal only needed status indication is become gateway status, just can directly transmit.
(8) gateway node detects the beep-page message at oneself when transmitting.Forwarding rate can be reduced, and carry out cellular communication simultaneously.Terminal is in the gateway status under the cellular network communication.When cellular communication finished, terminal was return gateway status, proceeded two nets and transmitted.Also be through with if transmit communication, terminal is directly return the parallel state of two nets, waits for the initiation of the communication of next time.
Claims (3)
1. the framing method that merges of TD SDMA and mobile ad-hoc network, it is characterized in that communications status with terminal is subdivided into five kinds of gateway status under Cellular Networks state, state of self-organization, two net parallel communications states, gateway status, the cellular network communication, the flag bit of design expression state, corresponding frame structure, and defined three kinds of different time slot types, and the switching of various states and framing flow process may further comprise the steps and undertaken by described order:
1) start: when starting up of terminal, at first catch the descending synchronous code of cell downlink pilot time slot by cell search process, with realize with current area synchronously, obtain to insert the condition of Cellular Networks,
2) initial condition: if when inserting successfully, terminal is in the Cellular Networks state, and all business time-slots all are used for cellular network communication, keeps traditional TD SDMA frame structure constant, under this kind state with peak nest subframe composition superframe.If access failure or do not cover following time at honeycomb, terminal then TSN time slot corresponding in 10 honeycomb subframes is formed the superframe of 1 50ms, wherein N=1,6, so that realize ad hoc network communication by the access way of time-division multiple access, and the search mobile ad hoc network, with reservation control/transmission time slot on superframe, if preengage successfully, then terminal becomes the activation node of mobile ad hoc network, is in state of self-organization, at this moment all reservation successful service time slots all are used for mobile ad hoc network communication
3) mobile status: because mobility, terminal under the Cellular Networks state might shift out cellular coverage, at this moment terminal is transferred and will be formed superframe in 10 honeycomb subframes, be convenient to realize ad hoc network communication by the access way of time-division multiple access, and the search mobile ad hoc network, with reservation control/transmission time slot on superframe, if preengage successfully, then terminal becomes the activation node of mobile ad hoc network, is in state of self-organization; And when self-organization nodes moves in the cellular coverage, the superframe of 50ms can be reverted back 10 honeycomb subframes, and insert Cellular Networks, but the SOT state of termination sign remains unchanged, still be state of self-organization,
4) honeycomb state: when the cellular terminal of free time is initiated cellular services or detect at oneself beep-page message on the paging broadcast channel, need to determine institute's distributed time slot quantity and position according to dynamic channel assignment scheme and professional type that network adopted, if when initiating the self-organizing business or receiving the self-organization network call signaling, terminal will be formed superframe in 10 honeycomb subframes, and in self-organization network, utilize on the subframe idle time slot as its control/transmission time slot, thereby realize inserting simultaneously two networks, carry out the communication of another kind of network, terminal changes into the parallel state of two nets; If what receive is that two nets are transmitted request, terminal also need insert two networks simultaneously.This moment terminal will form superframe in 10 honeycomb subframes, and in self-organization network, utilize on the subframe idle time slot as its control/transmission time slot, change into gateway status,
5) state of self-organization: when the self-organization nodes of free time is initiated the self-organizing business or is received the self-organization network call signaling, the control that terminal has preferentially been preengage on superframe/transmission time slot transmitting data; If need carry out high speed data transfer, terminal can be preengage new transmission time slot in the idle time slot on superframe temporarily, and end of transmission promptly discharges; If when initiating cellular services or detecting at oneself beep-page message, terminal is according to required transmission rate and the dynamic channel assignment scheme that is adopted, determine the transfer of next step state and the conversion of frame structure, just when transmission rate when 144 kilobits/second are following, terminal inserts two networks simultaneously, subframe structure in the superframe is transformed into subframe structure under the two net parallel communications states by the subframe structure under the state of self-organization, flag bit changes into the parallel state of two nets, carry out the communication of Cellular Networks, and when transmission rate is higher than 144 kilobits/second, terminal withdraws from mobile ad hoc network, the superframe of 50ms reverts back 10 honeycomb subframes, subframe structure keeps traditional TD SDMA subframe structure constant, flag bit converts the Cellular Networks state to, be exclusively used in cellular communication, if what receive is that two nets are transmitted request, terminal also need insert two networks simultaneously, subframe structure in the superframe is transformed into subframe structure under the gateway status by the subframe structure under the state of self-organization, flag bit changes into gateway status
6) two net parallel communications states: when two net parallel terminals are finished communication, terminal node becomes two net nodes, still keep the parallel state of two nets, subframe structure in the superframe is constant, so that terminal is transmitted and two net parallel communicationss, and between two kinds of networks, freely switch, when need are finished self-organizing business or the low speed cellular services below 144 kilobits/second, node can utilize and oneself insert two network advantages simultaneously, directly communicate, and when transmission rate is higher than 144 kilobits/second, terminal need withdraw from self-organization network and be exclusively used in cellular communication, the superframe of 50ms reverts back 10 honeycomb subframes, and subframe structure keeps traditional TD SDMA frame structure constant, and flag bit is directly changed into the Cellular Networks state, and in the time need finishing two net forwarding business, terminal only needs status indication is become gateway status, and subframe structure need not to change and just can directly transmit
7) gateway status: gateway node is when transmitting, detect cellular pages message at oneself, forwarding rate can be reduced, subframe structure in the superframe is transformed into subframe structure under the two net parallel communications states by the subframe structure under the state of self-organization, to carry out cellular communication simultaneously, terminal is in the gateway status under the cellular network communication, when cellular communication finishes, terminal is return gateway status, proceeding two nets transmits, also be through with if transmit communication, terminal is directly return the parallel state of two nets, waits for the initiation of the communication of next time.
2. the framing method that Time Division-Synchronous Code Division Multiple Access according to claim 1 and mobile ad-hoc network merge, it is characterized in that: the corresponding subframe structure of defined five kinds of different conditions is as follows:
1) subframe structure under the Cellular Networks state
The subframe structure that refers to terminal keeps traditional TD SDMA frame structure constant,
2) subframe structure under the state of self-organization
Time slot TSO still is used to receive the descending pilot frequency and the cellular pages signal of Cellular Networks in the subframe structure of finger terminal to the DwPTS part; and time slot TS1 is used for ad hoc network communication to time slot TS6; and the burst of each self-organization network ruton time slot is by the synchronizing sequence of 64 chips, the training sequence of 144 chips, the data sequence of two 320 chips; deaden between the protection of 16 chips
3) subframe structure under the two net parallel communications states
Time slot TS1, time slot TS6 are used for cellular communication in the subframe structure of finger terminal, and time slot TS2 is used for ad hoc network communication to time slot TS5,
4) subframe structure under the gateway status
Time slot TS3, time slot TS4 are used for ad hoc network communication in the subframe structure of finger terminal, and time slot TS1, time slot TS2, time slot TS5, time slot TS6 are used for cellular communication, transmit the self-organizing signal,
5) subframe structure under the gateway status under the cellular network communication
Time slot TS1, time slot TS2, time slot TS5, time slot TS6 are used for cellular communication in the subframe structure of finger terminal, wherein time slot TS1, time slot TS6 are used for communicating by letter of gateway node self and Cellular Networks, time slot TS2, time slot TS5 are used to transmit the ad hoc network communication signal, and time slot TS3, time slot TS4 are exclusively used in ad hoc network communication.
3. the framing method that Time Division-Synchronous Code Division Multiple Access according to claim 1 and mobile ad-hoc network merge, it is characterized in that: the time slot in the superframe can be divided into following three kinds by function:
1) control/transmission time slot: obtain and keep always in Ad hoc network time reservation by terminal, to obtain the ad hoc network communication ability, it has control channel that sends control signaling and the transmission channel that transmits low speed data, is whether distinguishing terminal is the sign that self-organizing network activates node
2) transmission time slot is to preengage by activating node temporarily, only has transmission channel, is exclusively used in high speed data transfer and asymmetric Packet Service,
3) the public broadcasting time slot is to be used by the un-activation node, is specifically designed to the transmission of un-activation node IP and the reception of self-organizing network call signaling.
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