CN101179840A - Orthogonal frequency division multiplexing system access method and apparatus - Google Patents
Orthogonal frequency division multiplexing system access method and apparatus Download PDFInfo
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- CN101179840A CN101179840A CNA2006101471163A CN200610147116A CN101179840A CN 101179840 A CN101179840 A CN 101179840A CN A2006101471163 A CNA2006101471163 A CN A2006101471163A CN 200610147116 A CN200610147116 A CN 200610147116A CN 101179840 A CN101179840 A CN 101179840A
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Abstract
The invention provides an access method of orthogonal frequency division multiplexing system. The invention includes the following processes: broadcasting system information, in which a reserve frequency resource access mark is used for instructing whether an access terminal adopts a reserve frequency resource access method to access the orthogonal frequency division multiplexing system. In the situation that the reserve frequency resource access mark instructs the access terminal to adopt the reserve frequency resource access way, an access network reserves in at least one continuous physical frame the frequency resource used for the access terminal to transmits an access probe. In the situation that the reserve frequency resource access mark instructs the access terminal to adopt the reserve frequency resource access way, a user terminal transmits an access probe in the reserved frequency resource to access the orthogonal frequency division multiplexing system. By adopting the technical proposal, the invention realizes the following beneficial effects: effectively solving the problem of cell reverse access covered by the radius of a bigger cell, thereby significantly supporting a system access in the situation of broad coverage.
Description
Technical field
The present invention relates to the communications field, and more particularly, relate to a kind of ofdm system (OFDM) cut-in method and device.
Background technology
At present, 3G (3G (Third Generation) Moblie) mobile communication technology is ripe gradually commercial, and 3GPP2 (3G (Third Generation) Moblie collaborative project tissue 2) CDMA20001XEV-DO can further provide competitive wireless access system in the coming years.But want to keep following 10 years or the competitiveness in decades, need to introduce new wireless access technology.At present, industry is reached preliminary unanimity with regard to the technology of the eating dishes without rice or wine evolution of 3GPP2, promptly, being divided into two stages carries out: the stage one is adopted multi-carrier EV-DO (Data Only, only support Packet data service) technology, more consideration is compatible, just the evolution items of short-term; Second stage is to introduce more advanced technology, such as OFDM (OFDM) technology, MIMO technology or the like, can improve the spectrum efficiency and the peak rate of wireless access system greatly, is the evolution plan of 3GPP2 standard long-term.
Traditional multicarrier modulation system is that high-speed data-flow is formed the data flow of a plurality of low speed by serial to parallel conversion, and then modulates corresponding carrier wave respectively, thereby constitutes the parallel transmission system that sends of a plurality of low-rate datas.Wherein, a plurality of carrier waves that are used to modulate show as a plurality of nonoverlapping subcarriers on frequency band.
The OFDM technology is a kind of special multi-carrier modulation technology, have between each subcarrier 1/2 overlapping, but keep mutually orthogonal, receiving terminal can by the correlation demodulation technical point from, constitute data transmission system more efficiently.The OFDM technology can improve spectrum efficiency greatly, utilizes the DSP hardware of FFT and IFFT to realize simultaneously, can simplify the realization of ofdm system greatly.Ofdm system can also reduce intersymbol interference in addition, makes full use of frequency selectivity.
Because the plurality of advantages of OFDM technology, the OFDM technology is widely used at present.Usually, in order to eliminate the interference between the symbol to greatest extent, insert protection at interval between each OFDM symbol, this protection generally all is greater than the maximum delay expansion at interval, and the multipath component of such symbol just can not disturb next symbol.In order to ensure the orthogonality between the subcarrier, what insert in protection at interval is Cyclic Prefix, that is, and and the duplicate of useful signal.
In the AIE evolution technology LBC that 3GPP2 proposes, what preceding reverse data adopted is the OFDMA multiplex technique, and oppositely control section then adopts CDMA multiplexing.Reverse Access Channel R-ACH is positioned at the CDM control section, is used for carrying access signal when first the access.The R-ACH channel signal, sends to target at last and inserts the sector then through the sector scrambler at first through one 1024 rank Walsh modulation.
After the CDM control section process DFT conversion, through the OFDM modulation, send to then and eat dishes without rice or wine with data message.So final signal is eating dishes without rice or wine still to show as the OFDM symbol.
The CDM control section takies a part of frequency range (for example, taking 1.25MHz as CDMA ZONE on the bandwidth of 5MHz) and is used for sending control section.Simultaneously, in order to reduce to control expense, only at regular intervals, just can transmit control signal, according to existing protocol regulation, in a superframe, the physics frame number satisfies mould 6 and equals can send the CDM control section on these frames (i.e. the 5th, the 11st, the 17th and the 23rd physical frame) of 5.So the transmission structure of control section as shown in Figure 1.
With the 5MHz bandwidth is example, and each control section takies 1.25Mhz (128 continuous sub-carriers) wherein, and could send control section every 5 physical frames.Control section can also be carried out frequency hopping to obtain the effect of frequency diversity on the bandwidth of whole 5MHz.
Simultaneously, as shown in Figure 2, preceding reverse data transmission all is to be unit with the superframe in LBC, each superframe is made up of 24 physical frames, at forward direction, system provides superframe preamble (superframe preamble), for the AT capture systems, synchronously and obtain system parameters.Oppositely, there is not superframe preamble, so the length of reverse the 0th physical frame equals the length that the length of forward direction superframe preamble adds the 0th physical frame of forward direction.Preceding oppositely superframe is isometric and fully synchronous.
On the bandwidth of 5MHz, a normal physical frame (other physical frames except that reverse the 0th physical frame) length is 911.46 microseconds.Each physical frame comprises 8 OFDM symbols.Wherein the Cyclic Prefix of each OFDM symbol is 6.51 microseconds.The length of superframe preamble is 1.07 milliseconds, and superframe preamble also comprises 8 OFDM symbols, and the Cyclic Prefix of each OFDM symbol is 26.04 microseconds.So the length of reverse the 0th physical frame is 1981.46 microseconds.Relate to according to agreement, the 0th reverse physical frame is made up of 16 OFDM symbols, and the CP of wherein preceding 8 OFDM symbols is 26.04 microseconds, and the CP of back 8 OFDM symbols is 6.51 microseconds.So reverse the 0th data symbol that physical frame can transmit Duoed 1 times than the data symbol of common reverse physical frame transmission.
According to the front as can be seen to the description of Reverse Access Channel R-ACH and control section, after portable terminal (for example, mobile phone) start, at first need to catch leading, the parameter of obtaining relevant system parameters and using when inserting.When the mobile phone decision makes a call, mobile phone at first sends access probe in the position of CDM control section, up to receive the Access Grant that network side sends (insert and allow) indication from forward direction, mobile phone enters and connects the state of setting up, stop to send access probe, begin to send reverse control channel and reverse traffic channel.Access probe between the different user is to rely on orthogonal code to distinguish.So can be separately the access probe signaling zone that is aliasing in a plurality of users together.
When AT carries out oppositely initially inserting, will on the R-ACH channel, send access probe, at this moment owing to the reversed time of AT and AN is not calibrated, thus need the consideration influence in path delay, particularly for the bigger sub-district of coverage.According to the setting of existing Cyclic Prefix in the agreement, maximum has only 26 microseconds, just can only protect maximum delay to expand to the situation of 26 microseconds.But; because in the time of initial the access, reversed time is asynchronous, so will cause in the maximum delay expansion that is added to path delay; it such as coverage 10 kilometers sub-district; it is 66 microseconds that maximum path postpones, and adds the maximum delay expansion, considerably beyond maximum protection times 26 microsecond; will go wrong for reverse transfer this moment; performance for reverse access causes very big influence, even may not enter, such as situation shown in Figure 3.
For example; AT2 may be positioned at cell edge; the result path time delay is bigger; if the access signal that AT2 sends at the N frame; when AN receives the access signal of AT2; signal has been delayed to the N+1 frame; if and be positioned at the AT3 of cell centre; access delay is less, and AT3 will be overlapping at the access probe signal section that the N frame sends with AT2 in the data of N+1 frame transmission so; and overlapping part may be considerably beyond the length of guard time; will cause very big phase mutual interference like this between the signal, so the performance that inserts for AT2 can cause bigger influence, the business datum to AT3 also has very big interference simultaneously.Be provided with according to current agreement largest loop prefix, can only support that radius of society is 4 kilometers sub-district, obviously for the sub-district of radius of society greater than 4 kilometers, current design will influence the performance that oppositely inserts.
Therefore, according to correlation technique, influenced the reverse performance that inserts in sub-district of big radius of society.
Summary of the invention
The present invention is devoted to overcome the inherent shortcoming that above-mentioned correlation technique exists, and for this reason, the invention provides a kind of cut-in method and device of ofdm system.
According to an aspect of the present invention, provide a kind of orthogonal frequency division multiplexing system access method.
Orthogonal frequency division multiplexing system access method according to the present invention may further comprise the steps: first step, broadcast system message, wherein carry and reserve frequency resource access sign, be used to indicate incoming end whether to adopt reservation frequency resource access way to insert ofdm system; Second step inserts sign indication incoming end in the reservation frequency resource and adopts under the situation of reservation frequency resource access way, and Access Network remains for the frequency resource that incoming end sends access probe in advance on a continuous at least physical frame; Third step inserts sign indication incoming end in the reservation frequency resource and adopts under the situation of reservation frequency resource access way, and user terminal inserts ofdm system by send access probe on the frequency resource of reserving; And the 4th step, Access Network sends the access that wherein carries time adjustment amount information to incoming end and permits message after receiving access probe.
Carry in the system message that in first step, sends and reserve the frequency resource parameter information, be used to represent and the relevant information of reservation frequency resource; And in third step, incoming end sends the access probe signal according to reservation frequency resource parameter information and inserts.
Wherein, in above-mentioned second step, Access Network is reserved frequency resource as the time cycle that sends access probe on reverse the 0th frame.
The time adjustment amount information that relates in the 4th step is used to represent that incoming end sends the time adjustment amount of reverse traffic data and reverse control channel.
According to a further aspect in the invention, provide another kind of orthogonal frequency division multiplexing system access method.
Orthogonal frequency division multiplexing system access method according to the present invention may further comprise the steps: first step, Access Network remain for the frequency resource that incoming end sends access probe in advance on a continuous at least physical frame; And second step, incoming end sends access probe on the position that control section occurs.
Wherein, in first step, Access Network is determined the quantity of continuous physical frame according to the size of radius of society, and Access Network is not dispatched the frequency resource of reserving to other users and sent business.
Alternatively, between the first step and second step, further may further comprise the steps: steps A, broadcast system message wherein carries and reserves the quantity that frequency resource needs continuous physical frame.Wherein, the quantity of the CDM section load information that sends according to forward direction of Access Network and continuous physical frame selects to send the time of reverse control channel voluntarily.
Alternatively, after second step, further comprise: third step, Access Network sends the access that carries time adjustment amount information to incoming end and permits message, wherein, time adjustment amount information is used for representing reverse control channel is adjusted to the needed time adjustment amount of 1 frame of continuous a plurality of physical frames; The 4th step, Access Network is adjusted amount of bias notice incoming end with the Traffic Channel time.
Wherein, in above-mentioned the 4th step, incoming end is determined the reverse traffic channel transmitting time by the time adjustment amount of reverse control channel and the time adjustment amount of bias of Traffic Channel.
According to another aspect of the invention, provide a kind of ofdm system access device.
This device comprises: the system message broadcast module, be positioned at the Access Network side, be used for broadcast system message, carry in the system message and reserve frequency resource access sign, be used to indicate incoming end whether to adopt reservation frequency resource access way to insert ofdm system; Frequency resource is reserved module, is positioned at the Access Network side, is used for remaining in advance on physical frame the frequency resource that incoming end sends access probe; And system's access module, it is distolateral to be positioned at access, reserve frequency resource access sign indication incoming end and adopt under the situation of reserving the frequency resource access way, system's access module inserts ofdm system by send access probe on the frequency resource of reservation.
Wherein, frequency resource is reserved module can reserve frequency resource as the time cycle that sends access probe on reverse the 0th frame, also can reserve identical frequency resource on continuous one or more physical frames and be used to send access probe.
Said apparatus further comprises: insert and permit message transmission module, be positioned at the Access Network side, be used for sending the access that wherein carries time adjustment amount information to user terminal and permit message.Wherein, time adjustment amount information is used to represent that incoming end sends the time adjustment amount of reverse traffic data and reverse control channel.
By above technical scheme, the present invention has realized following beneficial effect: solved the reverse problem that inserts in sub-district that big radius of society covers effectively, thereby supported the system under the wide coverage condition to insert effectively.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and exemplary embodiment of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 illustrates the schematic diagram that sends structure according to the control section of correlation technique;
Fig. 2 is the schematic diagram that illustrates according to the reverse data transmission example of correlation technique;
Fig. 3 is the schematic diagram that illustrates according to the reverse access example of correlation technique;
Fig. 4 is the flow chart that illustrates according to the OFDM cut-in method of first embodiment of the invention;
Fig. 5 is illustrated in the schematic diagram of reserving the example of frequency resource on the 0th physical frame;
Fig. 6 is illustrated in the schematic diagram that sends access probe on the 0th physical frame;
Fig. 7 is the flow chart that illustrates according to the OFDM cut-in method of second embodiment of the invention;
Fig. 8 is illustrated in the schematic diagram of reserving the example of frequency resource on continuous a plurality of physical frames;
Fig. 9 is illustrated in the schematic diagram that sends access probe on continuous a plurality of physical frames;
Figure 10 illustrates the schematic diagram that search window is provided with example;
Figure 11 is a schematic diagram of optimizing the example of reverse control channel;
Figure 12 illustrates the schematic diagram that incoming end carries out the time adjustment; And
Figure 13 is the block diagram that illustrates according to the OFDM access device of third embodiment of the invention.
Embodiment
Specifically describe the preferred embodiments of the present invention hereinafter with reference to accompanying drawing, wherein, accompanying drawing constitutes the application's a part, and is used from explaination principle of the present invention with embodiments of the invention one.
In this embodiment of the present invention, a kind of ofdm system (OFDM) cut-in method is provided, as shown in Figure 4, this method may further comprise the steps:
Step S402, whether broadcast system message wherein carries and reserves frequency resource access sign, be used to indicate incoming end to adopt reservation frequency resource access way to insert ofdm system; Step S404 inserts sign indication incoming end in the reservation frequency resource and adopts under the situation of reservation frequency resource access way, and Access Network remains for the frequency resource that incoming end sends access probe in advance on a continuous at least physical frame; Step S406 inserts sign indication incoming end in the reservation frequency resource and adopts under the situation of reservation frequency resource access way, and user terminal inserts ofdm system by send access probe on the frequency resource of reserving; And step S408, Access Network sends the access that wherein carries time adjustment amount information to incoming end and permits message after receiving access probe.
Below will describe each above step in detail.
At first, step S402:
Reserve the frequency resource access way referred in this and also can be called big sub-district access module.
Face description of related art as can be seen, preceding reverse superframe complete matching so the length of reverse the 0th physical frame is longer, can reach 1981.46 microseconds in the past.The relation that postpones (being in the transmission delay of the user at edge, sub-district) and coverage radius of cell according to maximum path to the Access Network side, promptly, 1 kilometer maximum path of the every increase of cell coverage area postpones to increase by 6.7 microseconds, therefore, if 1981.46 microseconds that reverse the 0th physical frame reserved out are used as the time cycle that sends access probe, access probe still adopts the transformat according to the General Physics frame, i.e. 8 OFDM symbols, and length is 911.46 microseconds (as shown in Figure 6).
Incoming end is with the system forward time reference of the catching transmission access probe that is as the criterion, but because path delay, be in the probe that the user at edge, sub-district sends and just can reach Access Network through certain hour possibly, as shown in Figure 5, the maximum path that can tolerate this moment postpones that 1070 microseconds can be arranged, this moment, the coverage of sub-district can reach 160 kilometers, can satisfy very big sub-district and cover.
In addition, reserving frequency resource access sign can be the Large Cell Enable field of 1bit, for example, when being set to 1, the expression incoming end (for example, mobile phone etc.) access way (that is, the reserved resource access way of the present invention) connecting system under the big sub-district of employing covers, otherwise according to original protocol processes.After incoming end is caught network, when initiating to insert, insert according to system parameter setting thereby just can obtain this field.
In step S406, the form of access probe signal is according to the access probe signal format of stipulating in the existing protocol, and length is 911.46 microseconds.Access Network according to the frequency resource of reserving, is resolved and distinguishes the access of different user according to the different orthogonal code of different user when receiving the 0th reverse physical frame.
In step S408, generally speaking, Access Network (AN) all can notify incoming end (AT) to send reverse traffic data and reverse control channel in advance, overcomes because the transmission signals that cause in the path postpones, and guarantees all to align from the preceding reversed time that the AN side is seen.With Fig. 7 is example, if 1070 microseconds are arranged path delay, so AN send to the time adjustment amount of AT just should be notice AT in advance 1070 microseconds send reverse traffic data and reverse control channel, simultaneously because AT is in constantly moving, so the time adjustment is ongoing, after access, AN can also notify the AT time of carrying out to adjust by other signaling message, and the time in this time is adjusted and just comprises certain hour and postponement certain hour in advance.
Reverse the 0th physical frame is the physical frame of a time going up expansion, so reserve enough guard times before and after can giving the access probe signal, the interference (as shown in Figure 7) before and after avoiding between the physical frame.It should be noted that this time physical frame of last expansion also not necessarily is fixed on the 0th the reverse physical frame.
Second embodiment
In this embodiment of the present invention, provide a kind of ofdm system (OFDM) cut-in method.
As shown in Figure 7, this method may further comprise the steps: step S702, Access Network remain for the frequency resource that incoming end sends access probe in advance on a continuous at least physical frame; Step S704, incoming end sends access probe on the position that control section occurs; Step S706, Access Network send the access that carries time adjustment amount information to incoming end and permit message, and wherein, time adjustment amount information is used for representing reverse control channel is adjusted to the needed time adjustment amount of 1 frame of continuous a plurality of physical frames; And step S708, Access Network is adjusted amount of bias notice incoming end with the Traffic Channel time.
Wherein, in step S702, Access Network is determined the quantity of continuous physical frame according to the size of radius of society, and Access Network is not dispatched the frequency resource of reserving to other users and sent business.For example, as shown in Figure 8, can reserve frequency resource and supply the user of big cell edge to send the access probe signal on three continuous physical frames, it is 1822.92 microseconds that the maximum path that can tolerate this moment postpones, and the sub-district that can reach 270 kilometers covers.Access Network is determined the quantity (that is, expanded period) of continuous physical frame according to the size of radius of society, such as for the sub-district that covers 5 kilometers, does not need expansion, promptly adopts to send access probe on 1 physical frame and get final product; And, then can expand 2 frames, promptly on 2 continuous physical frames for the sub-district that covers 80 kilometers; Cover for bigger sub-district, then can expand 3 frames.The signal of the access probe that send this moment still adopts the prescribed form in the existing protocol.Only take the length of 1 physical frame.
Wherein, the processing of present embodiment can be fully by Access Network, i.e. the AN control of dispatching realizes.AT can know whether to support big sub-district to insert.AT still is according to the regulation of existing protocol; on the position that control section occurs, send the access probe signal; owing to be reserved with time enough, enough guard times have then been formed in the front and back of access probe signal, the phase mutual interference before and after having avoided between the signal.The AN side is (promptly at this band frequency resource that sends control section) when receiving reverse access probe signal, according to the cycle N that expands (promptly, the quantity of continuous physical frame), search window (Searchwindow) size of self is set, expanded period is big more, search window is big more, guarantees all possible access probe signal is included in (as shown in figure 10) in the search window.
Below further describe step S706: in the present embodiment, can also send reverse control channel to user after inserting and (comprise the CQI channel, REQ channel etc.) be optimized, because the control section transmission time is elongated, so can be by a plurality of reverse control channel transmission time-divisions of having inserted the user are reached the function that alleviates reverse control section load, as shown in figure 12.
In this case, because AT can adjust to arbitrary frame in expanded period factors such as (concrete adjustment algorithm) may considering to be responsible for to the transmitting time of control channel, so when the time of doing is adjusted, can be directly adjustment amount notice AT of needed time of the frame of choosing in Access Grant message, AT will send reverse control channel in the position of correspondence naturally so, and the traffic channel data of back is then by other message informing.At this moment, have following processing: AN and wish that AT sends reverse control channel at second frame of expansion, AN can directly notify AT with time adjustment amount T in Access grant message so, AT just sends reverse control channel according to time adjustment amount T so, and when AT need send reverse traffic channel, AN was then by other message, the offset that will setover notifies AT, the adjustment amount of AT transmission business datum just should be relevant with offset and T so, in last example, just should be offset+T.AN is right with the time accent that AT sends reverse control channel and reverse traffic data by two steps.Compare with a step of correlation technique and put in order, in AccessGrant message, obviously can pare down expenses.
Alternatively, between step S702 and step S704, further may further comprise the steps: step S702-2, broadcast system message wherein carries and reserves the quantity that frequency resource needs continuous physical frame.In this case, the quantity of the CDM section load information that sends according to forward direction of Access Network and continuous physical frame selects to send the time of reverse control channel voluntarily.Also can improve the load Distribution of CDM control section.
The 3rd embodiment
In this embodiment of the present invention, provide a kind of ofdm system (OFDM) access device.
As shown in figure 13, this device comprises: system message broadcast module 1302, be positioned at the Access Network side, and be used for broadcast system message, carry in the system message and reserve frequency resource access sign, be used to indicate incoming end whether to adopt reservation frequency resource access way to insert ofdm system; Frequency resource is reserved module 1304, is positioned at the Access Network side, is used for remaining in advance on physical frame the frequency resource that incoming end sends access probe; And system's access module 1306, it is distolateral to be positioned at access, reserve frequency resource access sign indication incoming end and adopt under the situation of reserving the frequency resource access way, system's access module inserts ofdm system by send access probe on the frequency resource of reservation.
Wherein, frequency resource is reserved module 1302 can reserve frequency resource as the time cycle that sends access probe on reverse the 0th frame, also can reserve identical frequency resource on continuous one or more physical frames and be used to send access probe.
Said apparatus further comprises: insert and permit message transmission module 1308, be positioned at the Access Network side, be used for sending the access that wherein carries time adjustment amount information to user terminal and permit message.Wherein, time adjustment amount information is used to represent that incoming end sends the time adjustment amount of reverse traffic data and reverse control channel.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.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 (18)
1. an orthogonal frequency division multiplexing system access method is characterized in that, may further comprise the steps:
First step, whether broadcast system message carries in the described system message and reserves frequency resource access sign, be used to indicate incoming end to adopt reservation frequency resource access way to insert ofdm system;
Second step inserts the described incoming end of sign indication in described reservation frequency resource and adopts under the situation of described reservation frequency resource access way, and Access Network remains for the frequency resource that described incoming end sends access probe in advance on a continuous at least physical frame; And
Third step, insert the described incoming end of sign indication in described reservation frequency resource and adopt under the situation of described reservation frequency resource access way, described user terminal inserts ofdm system by send access probe on the frequency resource of described reservation.
2. orthogonal frequency division multiplexing system access method according to claim 1 is characterized in that, in described second step, Access Network is reserved described frequency resource as the time cycle that sends described access probe on reverse the 0th frame.
3. orthogonal frequency division multiplexing system access method according to claim 1 is characterized in that, in described first step, carries in the described system message and reserves the frequency resource parameter information, is used to represent and the relevant information of described reservation frequency resource.
4. orthogonal frequency division multiplexing system access method according to claim 3 is characterized in that, in described third step, described incoming end sends the access probe signal according to described reservation frequency resource parameter information and inserts.
5. orthogonal frequency division multiplexing system access method according to claim 1 is characterized in that, after described third step, further may further comprise the steps:
The 4th step, described Access Network send the access that wherein carries time adjustment amount information to described incoming end and permit message after receiving described access probe.
6. orthogonal frequency division multiplexing system access method according to claim 5 is characterized in that, described time adjustment amount information is used to represent that described incoming end sends the time adjustment amount of reverse traffic data and reverse control channel.
7. an orthogonal frequency division multiplexing system access method is characterized in that, may further comprise the steps:
First step, Access Network remain for the frequency resource that incoming end sends access probe in advance at least one continuous physical frame; And
Second step, described incoming end sends access probe on the position that control section occurs.
8. orthogonal frequency division multiplexing system access method according to claim 7 is characterized in that, in described first step, described Access Network is determined the quantity of described continuous physical frame according to the size of radius of society.
9. orthogonal frequency division multiplexing system access method according to claim 7 is characterized in that, the described frequency resource that described Access Network will not reserved is dispatched to other users and sent business.
10. orthogonal frequency division multiplexing system access method according to claim 7 is characterized in that, between described first step and described second step, further may further comprise the steps:
Steps A, broadcast system message wherein carries and reserves the quantity that frequency resource needs continuous physical frame.
11. orthogonal frequency division multiplexing system access method according to claim 10 is characterized in that, the quantity of CDM section load information that described Access Network sends according to forward direction and described continuous physical frame selects to send the time of reverse control channel voluntarily.
12. according to each described orthogonal frequency division multiplexing system access method in the claim 7 to 11, it is characterized in that, after described second step, further comprise:
Third step, described Access Network sends the access that carries time adjustment amount information to described incoming end and permits message, wherein, described time adjustment amount information is used for representing reverse control channel is adjusted to the needed time adjustment amount of 1 frame of described continuous a plurality of physical frames;
The 4th step, Access Network is adjusted amount of bias with the Traffic Channel time and is notified described incoming end.
13. orthogonal frequency division multiplexing system access method according to claim 12, it is characterized in that, in described the 4th step, described incoming end is determined the reverse traffic channel transmitting time by the time adjustment amount of reverse control channel and the time adjustment amount of bias of Traffic Channel.
14. an ofdm system access device is characterized in that, comprising:
Whether the system message broadcast module is positioned at the Access Network side, is used for broadcast system message, carries in the described system message to reserve frequency resource access sign, be used to indicate incoming end to adopt reservation frequency resource access way to insert ofdm system;
Frequency resource is reserved module, is positioned at the Access Network side, is used for remaining in advance on physical frame the frequency resource that incoming end sends access probe; And
System's access module, it is distolateral to be positioned at access, described reservation frequency resource inserts the described incoming end of sign indication and adopts under the situation of described reservation frequency resource access way, and described system access module inserts ofdm system by send access probe on the frequency resource of described reservation.
15. ofdm system access device according to claim 14 is characterized in that, described frequency resource is reserved module and is reserved described frequency resource as the time cycle that sends described access probe on reverse the 0th frame.
16. ofdm system access device according to claim 14 is characterized in that, described frequency resource reservation module is reserved identical frequency resource and is used to send described access probe on continuous one or more physical frames.
17. ofdm system access device according to claim 14 is characterized in that, further comprises:
Insert and permit message transmission module, be positioned at the Access Network side, be used for sending the access that wherein carries time adjustment amount information and permit message to user terminal.
18. ofdm system access device according to claim 17 is characterized in that, described time adjustment amount information is used to represent that described incoming end sends the time adjustment amount of reverse traffic data and reverse control channel.
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| CN105207903A (en) * | 2009-02-20 | 2015-12-30 | 汤姆森特许公司 | Time Synchronized Resource Reservation Over Packet Switched Networks |
| US9553824B2 (en) | 2009-02-20 | 2017-01-24 | Thomson Licensing | Time synchronized resource reservation over packet switched networks |
| CN105207903B (en) * | 2009-02-20 | 2019-02-15 | 汤姆森特许公司 | The method and apparatus of time synchronization resource reservation on packet switching network |
| CN103167630A (en) * | 2013-03-22 | 2013-06-19 | 哈尔滨工业大学 | Method for performing point-to-point off-line direct mode operation under public network time division-long term evolution (TD-LTE) |
| CN103167630B (en) * | 2013-03-22 | 2015-06-24 | 哈尔滨工业大学 | Method for performing point-to-point off-line direct mode operation under public network time division-long term evolution (TD-LTE) |
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