CN101193046A - Asynchronous cell/section communication method and device - Google Patents
Asynchronous cell/section communication method and device Download PDFInfo
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- CN101193046A CN101193046A CNA2006101449206A CN200610144920A CN101193046A CN 101193046 A CN101193046 A CN 101193046A CN A2006101449206 A CNA2006101449206 A CN A2006101449206A CN 200610144920 A CN200610144920 A CN 200610144920A CN 101193046 A CN101193046 A CN 101193046A
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Abstract
The invention provides an asynchronous district / sector communication method, which mainly comprises the following steps: the first step, a user terminal and a original service district / sector negotiate to select one or more suitable interlaces for asynchronous district / sector switching or switching preparation and signaling confirmation is passed; the second step, after the confirmation, the original service district / sector serves the user terminal on the one or more selected interlaces; the third step, the user terminal sends the switching preparation signaling or switching signaling to the target district / sector on the interlaces with the opposite direction which need not send signals to the original district / sector after the selection. By adopting the above technical scheme, the invention realizes the following beneficial effects: reducing time delay of switching between asynchronous districts / sectors, improving the quality of user service, then improving the system throughput.
Description
Technical field
The present invention relates to the communications field, and more particularly, relate to a kind of asynchronous cell/section communication method and device, it is applicable to the wireless communication system of the various packet switch of OFDMA (based on the access scheme of the orthogonal frequency division multiplexi) system that comprises the resource centralized dispatching.
Background technology
Mobile communication system is one of focus of present Research on Communication Technology.In mobile communication system, the user is moving between the network of same wireless technology and is moving between the network of different radio technology, just becomes a kind of inevitable demand, is exactly the basic skills that solves various mobility demands and switch.Character according to switching generally is divided into soft handover and direct-cut operation to switching.In simple terms, soft handover is exactly to connect earlier the switching that afterwards disconnects, and promptly user terminal elder generation and target BS are set up a kind of changing method that contact and then disconnection and former base station are got in touch; Direct-cut operation is exactly to disconnect latter linked switching earlier, i.e. user terminal disconnection is earlier got in touch with former base station, sets up a kind of changing method of contact again with target BS.The handoff technique that industry is mainly used is described below.
Adopt the code division multiplexing mode to compare with CDMA20001x system forward link, 1xEV-DO system forward link mainly adopts time division multiplexing mode.In order further to improve the resource utilization of 1xEV-DO system, 1xEV-DO system forward link employing virtual soft technology generation has been replaced the traditional soft handoff technique in the CDMA20001x system; Because only there is a data passage simultaneously in the forward link of virtual soft, and may there be a plurality of data channel in the forward link that traditional soft is switched simultaneously, so the forward direction virtual soft technology of 1xEV-DO system has been eliminated the additional system expense that the traditional soft handoff technique in the CDMA20001x system produces.
In OFDMA (based on the access scheme of orthogonal frequency division multiplexi) orthogonal frequency division multiplexing multiple access connecting system, forward link mainly adopts the time-division to add the frequency division multiplexing mode.In order to solve the mobility problem of terminal, improve the resource utilization of forward direction, the technology that has adopted fast cell/sector selection/fast base station to select mostly.Specifically, the principle that switch fast cell/sector is: in each time slot (frame), the signal to noise ratio of all pilot tones in the terminal continuous measurement Active Set, therefrom the top-quality cell/section of selective channel is as service cell/sector, terminal is told the sign of the service cell/sector that the cell/section oneself in the Active Set is chosen by up signaling, the Active Set cell/section identifies this up signaling, selected cell/section then becomes the service cell/sector of terminal, former service cell/sector then stops data and sends, in the transmission course of data, terminal only with Active Set in a cell/section communicate.
As seen, in FCS (fast cell/sector is selected) technology, terminal selects in the activation group the best cell/section of channel condition to provide downlink data to transmit for it apace, different with soft hand-off, although these cell/sections all belong to same Active Set, at any time, there is and have only a base station to communicate contact with AT (accessing terminal), this has just reduced interference potentially, has improved power system capacity.In addition, the use of FCS technology can improve usage factor of system resource, also can regard replenishing of fast dispatch as, has increased the scheduling in space outside time scheduling, has further improved diversity gain, reduces the purpose of disturbing and improving power system capacity thereby reach.
Yet, fast cell/sector selects technology will reach its desirable effect, just requiring interior all cell/sections of Active Set is synchronous or basic synchronization, could realize the quick switching of user terminal between former service cell/sector and target serving district/sector like this.When former service cell/sector and target serving district/sector are asynchronous in the Active Set, user terminal just need carry out access exploration and catch when switching, thereby and target serving district/sector acquisition synchronously, and fast cell/sector selects the effect of technology just to make a discount in this case.
How make full use of the advantage of fast cell/sector selections technology under the situation that asynchronous cell/section switches, effectively reduce user's handover delay, raising user's throughput is that the present invention prepares the problem furtheing investigate and solve.
In packet switching system, usually adopt time division multiplexing and the HARQ method of (mixing automatic repeat requests), one continuous period is divided into a plurality of time slots that the time upward equates, (Resource Block of black among Fig. 1 or shade correspondence belongs to interlace again one group of time slot that satisfies certain common trait to be called an interlace, promptly, frame number belongs to an interlace divided by the equal frame of the mould of interlace sum, such as total interlace number is 6, then the 1st, 7,13,19... frame belongs to an interlace), the process of transmitting of a packet (that is HARQ process) etc. is all finished on an interlace.
As shown in Figure 2, forward direction oppositely needs an ACK message to respond when sending among the HARQ, and whether expression correctly receives.Certain interlace of agreement general provision forward direction goes up all bags that send and responds on certain reverse interlace.Oppositely also be like this.
In the mobile communication system of present packet switch, when all cell/sections in the Active Set not all are synchronized cells/sector, be when having a plurality of synchronous subset in the Active Set, when user terminal need switch to cell/section in another synchronous subset fast from the cell/section the synchronous subset, user terminal was carried out the flow process of switching fast cell/sector and is depended on its ability.If the terminal support receives its down control channel information and sends ascending control channel information (terminal needs very strong Base-Band Processing ability) the cell/section of all synchronous subset in the Active Set simultaneously, terminal can be carried out normal fast cell/sector and select flow process; If terminal can not support simultaneously the cell/section of all synchronous subset in the Active Set to be received the operation (most situation is like this) of down control channel information and transmission ascending control channel information, terminal just can only be carried out special fast cell/sector and select flow process, promptly needs to finish in target cell/sector to initiate again to insert and and the synchronous process of target cell/sector.
Wherein, Fig. 3 shows the flow chart of the asynchronous fast cell/sector switching (being used for asynchronous system) according to correlation technique.With reference to Fig. 3, switch (being used for asynchronous system) according to the asynchronous fast cell of correlation technique/sector and comprise following processing:
(a) channel conditions monitoring, the cell/section in the terminal searching Active Set, the assessment down channel quality is selected the good cell/section of down channel quality; (b) AT stops to send the up signaling of CQI to Active Set current service cell/sector; (c) AT initiates access exploration to target serving district/sector; (d) target serving district/sector receives the access request of AT, response Access Grant (insert and permit); (e) target serving district/sector and former service cell/sector and Anchor AP hold consultation, and target cell/sector is obtained in the former service cell/sector information about AT; And (f) Anchor AP prepares data and issues target cell/sector, and target cell/sector becomes service cell/sector, begins to send data, and switching flow finishes.
As mentioned above, exist in Active Set under a plurality of synchronous subset and the terminal Base-Band Processing situation limited in one's ability, the user carries out quick asynchronous cell/section switches and must carry out according to existing procedure.In this case, the switching behavior that just can know the user after user terminal inserts and the business datum transmission situation of obtaining the information of AT and having finished by network must be waited until in target serving district/sector, select flow process to compare with normal fast cell/sector, need spend the more time to obtain the target data formation from network, thereby increased handover delay, reduce the QoS (service quality) of customer service, also reduced user's throughput.
Therefore, need a kind ofly can under the situation that asynchronous cell/section switches, to make full use of the advantage of fast cell/sector selection technology, effectively to reduce user's handover delay, thereby improve the solution of user's throughput, it can solve the one or more problems that exist in the correlation technique.
Summary of the invention
The present invention is devoted to overcome the one or more inherent shortcomings in the above-mentioned correlation technique, for this reason, the invention provides a kind of asynchronous cell/section communication method and device.
According to one embodiment of present invention, provide a kind of asynchronous cell/section communication method.
This method may further comprise the steps: first step, user terminal and former service cell/sector consult to select one or more suitable interlace to be used to carry out the asynchronous cell/section switching or to switch prepare, and confirm by signaling; And second step, after both sides confirmed, former service cell/sector was served for user terminal on the one or more interlace that select.
In first step, user terminal is selected one or more interlace:(1 according in the following principle any one) send reverse link traffic channel or ascending control channel or uplink ACK channel information in target cell/sector when avoiding sending reverse link traffic channel or ascending control channel or uplink ACK channel on the former service cell/sector between two asynchronous cell/sections according to self-ability.(2) receive descending shared control signal channel or downlink traffic channel or descending ack channel in target cell/sector when avoiding receiving descending shared control signal channel or downlink traffic channel or descending ack channel on the former service cell/sector between two asynchronous cell/sections according to self-ability.
If former service cell/sector is selected interlace, then former service cell/sector is sought suitable interlace by the deviation that current absolute time and frame according to two sectors are provided with between parameter (FFT size, CP length etc.) the former service cell/sector of calculating and the target serving district/sector; If user terminal selecting interlace, the information and the suitable interlace of delay situation searching of own two sectors that receive time calibration that sends according to former service cell/sector and target serving district/sector of user terminal then.
In second step, the service that former service cell/sector is carried out comprises: only send down control channel information to user terminal on the one or more interlace that select; Only on the one or more interlace that select, distribute the up-downgoing traffic channel resource for user terminal; Only on an interlace on the one or more interlace that select, receive the ascending control channel information that the user sends; Only on the one or more interlace that select, receive the uplink ACK channel information that user terminal sends; Only on the one or more interlace that select to the descending ack channel information of user terminal.
Before above-mentioned/certain corresponding relation is arranged between reverse ack channel and the Traffic Channel of anti-forward direction, determined behind the residing interlace of Traffic Channel of anti-forward direction when former service cell/sector or user terminal selecting interlace before/interlace of reverse ack channel is also definite thereupon.
The interlace of above-mentioned transmission uplink ACK channel, ascending control channel and reverse link traffic channel can be identical or different.The interlace of the descending ack channel of above-mentioned reception, ascending control channel and reverse link traffic channel can be identical or different.
In addition, this method further may further comprise the steps: third step, user terminal is not needing to send switching preparation signaling or hand off signaling to target cell/sector on the reverse interlace of former service cell/sector transmitting channel after the selection.
In third step, signaling is prepared in the switching that user terminal sends to target cell/sector or hand off signaling comprises: the access exploration that sends on access channel; The reverse pilot indication that on the reverse pilot indicating channel, sends, the reverse request message that on reverse request channel, sends, the forward channel quality of on channel quality feedback channel, feeding back indication.
Wherein, before first step, further may further comprise the steps: step a: user terminal adds Active Set with asynchronous cell/section; Step b: when user terminal or former service cell/sector detected certain cell/section in the non-current service synchronous subset that is in the Active Set and satisfy the interlace alternative condition, decision was carried out interlace and is selected.
According to another embodiment of the present invention, provide a kind of asynchronous cell/section communicator.
Asynchronous cell/section switching device shifter according to the present invention comprises: asynchronous cell/section is switched and determined the unit, is positioned at subscriber terminal side, is used for judging that whether carrying out asynchronous cell/section switches; The interlace selected cell, be positioned at subscriber terminal side or former service cell/sector side, be used for when asynchronous cell/section is switched and determined the switching of unit decision carrying out asynchronous cell/section, selects one or more suitable interlace, and consulting with former service cell/sector or user terminal; And service unit, be positioned at former service cell/sector side, be used on one or more interlace that the interlace selected cell is selected, serving for user terminal.
Wherein, the service carried out of service unit comprises: only send down control channel information to user terminal on the one or more interlace that select; Only on the one or more interlace that select, distribute the up-downgoing traffic channel resource for user terminal; Only on an interlace on the one or more interlace that select, receive the ascending control channel information that the user sends; Only on the one or more interlace that select, receive the uplink ACK channel information that user terminal sends; Only on the one or more interlace that select, send descending ack channel information to user terminal.
Preferably, said apparatus further comprises: switching treatmenting unit, be connected to scheduling and channel resource allocation unit, and be used to carry out hand-off process.
This switching treatmenting unit further comprises: the access exploration module, be positioned at subscriber terminal side, be used under the situation of the business of not interrupting former service cell/sector, initiate access exploration to target serving district/sector at the time slot that does not need to send signal to former service cell/sector; Switch preparation module, be positioned at subscriber terminal side, be used under the situation of the business of not interrupting former service cell/sector, initiate the indication of reverse pilot quality to target serving district/sector at the time slot that does not need to send signal to former service cell/sector; Insert and permit judging module, be positioned at target serving district/sector side, be connected to the access exploration module, be used for behind target serving district/sector acquisition access exploration, whether decision permits user terminal is inserted; Time synchronized and power regulation module are positioned at target serving district/sector side, are used to carry out time synchronized and power adjustment; The hand off signaling sending module, be positioned at subscriber terminal side, be connected to access allowance judging module, be used for giving target serving district/sector with new channel quality information and reverse request message report inserting under the situation of permitting the access of judging module decision allowance user terminal; And interlace selects to remove module, be positioned at subscriber terminal side or former service cell/sector side, be connected to insert and permit judging module, be used under the situation that access allowance judging module decision refusing user's terminal inserts request releasing interlace selection service.
The interlace selected cell is selected one or more interlace:(1 according in the following principle any one) avoid in two systems, sending ascending control channel information simultaneously according to self-ability; (2) avoid in two systems, sending ascending control channel information simultaneously and/or receiving down control channel information simultaneously according to self-ability; (3) avoid in two systems, sending reverse link traffic channel information simultaneously and/or receiving downlink traffic channel information simultaneously according to self-ability; (4) avoid in two systems, sending simultaneously the uplink ACK channel information and/or receive descending ack channel information simultaneously according to self-ability.
By means of asynchronous cell/section communication method of the present invention and device, in the wireless communication system of packet switch, in Active Set, exist under a plurality of synchronous subset and the ability of user terminal condition of limited, before switching, select suitable scheduling interlace to serve by user terminal, and notify former service cell/sector on those interlace, to dispatch, can on target cell/sector and former cell/section, accomplish transmission and the reception (some terminal receives and can carry out simultaneously) of time-division, thereby can in the process that sends CQI to former service cell/sector, initiate the handoff request of asynchronous cell/section simultaneously to asynchronous sectors, promptly, guarantee that terminal can stop to send CQI to former cell/section in the handoff request of accepting also can initiate when former service cell/sector is served the target asynchronous sectors again after successfully connecting with the target asynchronous cell/section.
Wherein, switching condition is: the cell/section signal strength signal intensity of non-current service synchronous subset is better, can satisfy the switching target requirement of user terminal; The channel resource that scheduling and channel resource allocation unit distribute comprises: traffic channel resource, control channel resource and ack channel resource.
By above technical scheme, the present invention has realized following beneficial effect: reduced user's time delay for switching between asynchronous cell/section, improved the service quality of user's service, and then improved throughput of system.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
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 is the schematic diagram that illustrates according to the interlace example of correlation technique;
Fig. 2 is the schematic diagram that illustrates according to the example that transmits on interlace of correlation technique;
Fig. 3 is the schematic diagram that illustrates according to the asynchronous cell/section switching flow of correlation technique;
Fig. 4 is the flow chart according to the asynchronous cell/section communication method of first embodiment of the invention;
Fig. 5 is the schematic diagram according to the asynchronous cell/section switching flow of first embodiment of the invention; And
Fig. 6 is the flow chart according to the asynchronous cell/section communication method of second embodiment of the invention;
Fig. 7 is the block diagram according to the asynchronous cell/section communicator 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.
First embodiment
In the present embodiment, provide a kind of asynchronous cell/section communication method, described this method hereinafter with reference to Fig. 4, as shown in Figure 4, this method may further comprise the steps:
Step S402: user terminal adds Active Set with asynchronous cell/section; Step S404: when user terminal or former service cell/sector detected certain cell/section in the non-current service synchronous subset that is in the Active Set and satisfy the interlace alternative condition, decision was carried out interlace and is selected; Step S406: user terminal and former service cell/sector consult to select one or more suitable interlace so that carry out the asynchronous cell/section switching or switch preparing, and confirm by signaling; Step S408, after affirmation, former service cell/sector is served for user terminal on the one or more interlace that select, and returns interlace to user terminal and select acknowledge message; Step S410 selects acknowledge message in response to interlace, and user terminal sends hand off signaling (access exploration) to target cell/sector on non-selected interlace; Step S412: behind target serving district/sector acquisition access exploration, whether decision permits user terminal is inserted; Step S414-1: permit message (Access Grant message) in response to inserting, user terminal will send hand off signaling according to the switching demand; Or step S414-2: if do not receive and insert to permit message (Access Grant message) or be rejected, user terminal will carry out other processing; And step S416-1: target serving district/sector provides service to user terminal, finishes asynchronous cell and switches.
Below will specifically describe each step.
In step S404, after user terminal added Active Set with asynchronous cell, user terminal or former service cell/sector judged that need carry out interlace selects to select so that carry out carrying out interlace when switching between asynchronous subclass is prepared.The interlace alternative condition includes but not limited to that the channel quality of cell/section is higher than predetermined threshold.This thresholding can be the thresholding that the load of relative threshold, absolute thresholding or former service cell/sector is higher than certain value.Channel quality thresholds also can equal to add the thresholding of Active Set.Wherein the Interlace alternative condition of present embodiment correspondence is corresponding to switching condition.
The method that former service cell/sector detects includes but not limited between the channel quality of other sectors in the terminal to report Active Set or the different sector load condition by Signalling exchange.
User terminal comprises according to the method that self-ability decision interlace selects: if the user possesses the while to the cell/section transmission of a plurality of nonsynchronous synchronous subset and the ability of received signal, then any interlace is available.If the user only possesses simultaneously from nonsynchronous synchronous subset received signal of a plurality of asynchronous subclass and do not possess the ability that sends simultaneously, avoid sending signal simultaneously to a plurality of nonsynchronous synchronous subset simultaneously during then interlace selects.If the user only possesses simultaneously from nonsynchronous synchronous subset received signal of a plurality of asynchronous subclass and sends the ability of signal, avoid sending signal and received signal simultaneously to a plurality of nonsynchronous synchronous subset simultaneously during then interlace selects.
In step S406, user terminal according in the following principle any one or a plurality ofly select one or more interlace:(1) send reverse link traffic channel or ascending control channel or uplink ACK channel information in target cell/sector when avoiding sending reverse link traffic channel or ascending control channel or uplink ACK channel on the former service cell/sector between two asynchronous cell/sections according to self-ability.(2) receive descending shared control signal channel or downlink traffic channel or descending ack channel in target cell/sector when avoiding receiving descending shared control signal channel or downlink traffic channel or descending ack channel on the former service cell/sector between two asynchronous cell/sections according to self-ability.
Under mentioned above principle, select one group of interlace that is fit to former service cell/sector respectively, remaining interlace is fit to target serving district/sector simultaneously.If can't find above-mentioned two groups of interlace, then think and select failure.
At forward direction service cell/sector and the reverse different situation of service cell/sector, before carrying out the interlace selection, need preceding/reverse interlace is changed to same service cell/sector, or seek interlace by user terminal, and when seeking available interlace with preceding/oppositely the interlace of service cell/sector considers simultaneously, and will seek the result and notify to preceding/reverse service cell/sector, the method for notifying can be in the past/oppositely notice or terminal are notified by in-band signalling mutually between the service cell/sector.If forward direction service cell/sector and oppositely between the service cell/sector communication and negotiation mechanism are arranged, also can by preceding/oppositely service cell/sector is sought available interlace through consultation and is notified to terminal.
The forward direction interlace group and the reverse interlace group that are used for same synchronous subset have certain relation, such as: system is chosen in and sends forward direction assignment signaling on the interlace N, then must on interlace N, send forward traffic channel information, and on reverse interlace N+m, send reverse ACK signaling; System is chosen in and sends reverse assignment signaling on the interlace K, then must send reverse traffic channel information on reverse interlace K+L, and sends the ACK signaling of forward direction on the K+L+I of forward direction; The interlace that reverse control channel takies generally determines in advance that by system all users are identical under the same cell/section.The reverse control channel of two asynchronous subclass can not have overlapping, if having then must have the multichannel transmitting capacity just can be according to this flow processing.
The interlace of above-mentioned transmission uplink ACK channel, ascending control channel and reverse link traffic channel can be identical or different.The interlace of the descending ack channel of above-mentioned reception, ascending control channel and reverse link traffic channel can be identical or different.
If the sector that a plurality of asynchronous subclass are arranged in Active Set, also can select the interlace of many group quadratures to be respectively applied for a plurality of asynchronous subclass.
In addition, in step S406, former service cell/sector is sought suitable interlace by the deviation that current absolute time and frame according to two sectors are provided with between parameter (FFT size, CP length etc.) the former service cell/sector of calculating and the target serving district/sector; User terminal sends according to former service cell/sector and target serving district/sector time calibration information and own two sectors that receive the suitable interlace of delay situation searching.
If an interlace of former service cell/sector is across the situation of two interlace of target serving district/sector, if this moment, former service cell/sector was selected this interlace, then two of the target side correspondence interlace can not be used to send the signaling or the business of target side.Otherwise still.
It should be noted that one or more interlace that user terminal and former service cell/sector consult to select are divided into two groups of uplink and downlink.
After step S406, former service cell/sector or user terminal can be with other cell/sections in the interlace selection result notice Active Set, comprise other service cell/sector in the asynchronous subclass, also can comprise other service cell/sector in the synchronous subset; Other sectors can receive user's reverse access exploration and indicating (suitable interlace is meant capable some the forward direction interlace that sends the affirmation indication of the reverse interlace of reverse access exploration and this non-service cell/sector that the receiving target service cell/sector sends to target serving district/sector of terminal) to this terminal feedback acknowledgment on suitable interlace according to selection result on the suitable interlace.
The backward channel of listening user also can oneself be removed in target serving district/sector, include but not limited to: access channel, reverse pilot indicating channel, reverse request channel, channel quality feedback channel then do not need former service cell/sector or terminal notification target service cell/sector interlace to select situation this moment.
In step S408, the service that former service cell/sector is carried out comprises: only send down control channel information to user terminal on the one or more interlace that select; Only on the one or more interlace that select, distribute the up-downgoing traffic channel resource for user terminal; Only on an interlace on the one or more interlace that select, receive the ascending control channel information that the user sends; Only on the one or more interlace that select, receive the uplink ACK channel information that user terminal sends; Only on the one or more interlace that select to the descending ack channel information of user terminal.
In addition, in this process, interlace selects acknowledge message also can be sent to former service cell/sector (corresponding situation about selecting with former service cell/sector) or be sent to user terminal (corresponding situation about selecting with user terminal) by former service cell/sector by user terminal, and after confirming, subscriber equipment carries out the processing in the subsequent step.
In addition, former service cell/sector is not subscriber terminal service on nonoptional interlace, initiates to switch preparation or hand off signaling so that reserve the space for user terminal to target serving district/sector.
After above-mentioned step S408, user terminal can carry out follow-up switching or handover preparation process, as shown in Figure 4, may further comprise the steps:
Step S410: user terminal is not needing the interlace that sends signal to former service cell/sector to send access probe synchronous and power adjustment with acquisition time to target serving district/sector under the situation of the business of not interrupting former service cell/sector.The power adjustment obtains by the exploration process that sends access probe.This step also can be other signalings.
Step S412: behind target serving district/sector acquisition access probe, whether decision permits user terminal is inserted.Behind target serving district/sector acquisition access probe, and insert allowance message to user feedback under the situation that target serving district/sector allowance user inserts and agree switching.Time synchronization information is carried in inserting allowance message.
Wherein, permit inserting in target serving district/sector, and send under the situation that inserts allowance message (Access Grant message) to user terminal, proceed to following steps: step S414-1: in response to insert permitting message (Access Grant message), user terminal will according to the forward direction service cell/sector switch or oppositely service cell/sector switch or preceding/oppositely service cell/sector is switched decision simultaneously and is sent and indicate to target serving district/sector at the reverse request message of target serving district/sector and/or at the forward channel quality of target serving district/sector; And step S416-1: target serving district/sector provides service to user terminal, finishes asynchronous cell and switches;
If user terminal can correctly be received (the indication scheduling resource) the control signaling of insert permitting message and/or target serving district/sector within a certain period of time, then think handover success, otherwise think handoff failure.Terminal is according to whether needs carry out new switching or switch preparing to determine that whether removing interlace to former service cell/sector request selects service behind the handoff failure.Wherein, the Interlace alternative condition of present embodiment correspondence is corresponding to switching condition.
Under the situation of accepting to switch in target serving district/sector, if preceding/oppositely switch simultaneously and success, then handover success means to automatically terminate as time interlace and selects.If just switch forward direction or reverse service cell/sector, then whether forward direction or reverse former service cell/sector or user terminal according to circumstances determine to remove when time interlace selection, perhaps interlace are selected new forward direction or reverse service cell/sector after advisory is given switching.New preceding/reverse service cell/sector and user terminal are consulted whether need to remove current interlace and are selected.
In addition, user terminal determines transmission reverse request message and/or forward channel quality to indicate according to switching of forward direction service cell/sector or reverse service cell/sector switching after receiving access allowance message.
Insert at target serving district/sector refusal, and do not send under the situation of AccessGrant message to user terminal, proceed to following steps: step S414-2, user terminal is thought handoff failure, and whether according to needs initiate that new switching is prepared and other conditions are removed interlace to former service cell/sector request and selected service.
Wherein, Fig. 5 shows the exemplary flow of above-mentioned processing.
Second embodiment
In the second embodiment of the present invention, provide a kind of asynchronous cell/section communication method.
The main distinction of the method that provides among this method and first embodiment is that the channel and the signaling that send to asynchronous cell/section after interlace selects is different, particularly, in first embodiment, whether user terminal decision before selecting suitable Interlace carries out asynchronous cell/section switches, and in the present embodiment, user terminal decision after selecting suitable Interlace whether carrying out asynchronous cell/section switches to be prepared; In addition, select Interlace follow-up handover preparation process afterwards also different.Select the trigger condition of interlace also might be different, therefore in the present embodiment, with omit to first embodiment in being repeated in this description of same or similar part.
Below with reference to Fig. 6 asynchronous cell/section communication method according to present embodiment is described.As shown in Figure 6, this method may further comprise the steps:
Step S602: user terminal adds Active Set with asynchronous cell/section; Step S604: when user terminal or former service cell/sector detected certain cell/section in the non-current service synchronous subset that is in the Active Set and satisfy the interlace alternative condition, decision was carried out interlace and is selected; Step S606: user terminal and former service cell/sector consult to select one or more suitable interlace to switch preparation so that carry out asynchronous cell/section, and confirm by signaling;
And step S608, after the affirmation, former service cell/sector is served for user terminal on one or more interlace of user terminal selecting.Step S610: target inserts cell/section and carries out the synchronous and time adjustment of power; And step S612: user terminal decision carrying out asynchronous cell/section switches, and sends hand off signaling to target serving district/sector.S614: target serving district/sector provides service to user terminal, finishes asynchronous cell and switches;
Wherein among the step S604, when user terminal or former service cell/sector detected certain cell/section in the non-current service synchronous subset that is in the Active Set and satisfy the Interlace alternative condition, decision was initiated Interlace and is selected.
Certain cell/section in the non-current service synchronous subset satisfies the channel quality that the Interlace alternative condition includes but not limited to this sector and is higher than certain thresholding, and this thresholding can be that the load of relative threshold or absolute thresholding or former service cell/sector is higher than certain thresholding.Channel quality thresholds also can equal to add the thresholding of Active Set.The load that also can be former service cell/sector reaches certain thresholding.
Wherein the Interlace alternative condition of present embodiment correspondence corresponding with switch preparatory condition.
Step S606 is identical with S406 and the S408 of embodiment one with S608.
After step S608, former service cell/sector or user terminal can be with other cell/sections in the interlace selection result notice Active Set, comprise other service cell/sector in the asynchronous subclass, also can comprise other service cell/sector in the synchronous subset; Other sectors can receive user's reverse pilot indicating channel and indicating (suitable interlace is meant capable some the forward direction interlace that sends the pilot quality indication of the reverse interlace of reverse pilot indicating channel and this non-service cell/sector that the receiving target service cell/sector sends to target serving district/sector of terminal) to this terminal feedback pilot quality on suitable interlace according to selection result on the suitable interlace.
The backward channel of listening user also can oneself be removed in target serving district/sector, include but not limited to: access channel, reverse pilot indicating channel, reverse request channel, channel quality feedback channel then do not need former service cell/sector or terminal notification target service cell/sector interlace to select situation this moment.
At above-mentioned step S610: target insert cell/section carry out power synchronously and the method adjusted of time be that user terminal is not needing in former service cell/sector sends the interlace of target cell/sector of moment correspondence of signal to target cell/sector transmission pilot tone indicating channel, target serving district/sector according to the pilot tone indicating channel of receiving with the pilot quality indication and time calibration feedback information to user terminal, carry out power adjustment and time synchronized;
Pilot quality indication and time calibration information sending method include but not limited to following method:
The pilot quality indication can send by the control channel of target serving district/sector, time calibration signal can by former service cell/sector from in-band signalling send or target serving district/sector by at suitable interlace by directly transmission of scheduling, this scene is used for the scene that former service cell/sector or terminal are notified to the interlace selection result target serving district/sector.
It should be noted that all cell/sections that user terminal transmission pilot tone indicating channel can adopt the specific scrambler of user to be convenient in the asynchronous subclass can demodulation.
Can then in subsequent step, can directly send the indication of reverse request message or forward channel quality and switch so that user terminal is initiating to have obtained time synchronized and power adjustment before the switching of target serving district/sector under this situation.
In above-mentioned step S612, when user terminal or former service cell/sector detected certain cell/section in the non-current service synchronous subset that is in the Active Set and satisfy switching condition, decision was carried out asynchronous cell/section and is switched; Switching condition is identical with embodiment one.But the signaling that sends is the forward channel quality indication of feeding back on the reverse request message (being used for reverse service cell/sector switches) that sends on the reverse request channel, the channel quality feedback channel (is used for that the forward direction service cell/sector is switched or preceding/oppositely service cell/sector is switched simultaneously).
Step S614: after target serving district/sector acquisition handoff request, whether decision permits user terminal switches.
If user terminal can correctly receive within a certain period of time insert to permit message and or (the indication scheduling resource) control signaling of target serving district/sector, then think handover success, otherwise think handoff failure.Terminal is according to whether needs carry out new switching or switch preparing to determine that whether removing interlace to former service cell/sector request selects service behind the handoff failure.Wherein, the Interlace alternative condition of present embodiment correspondence is corresponding to switching condition.
Under the situation of accepting to switch in target serving district/sector, if preceding/oppositely switch simultaneously and success, then handover success means to automatically terminate as time interlace and selects.If just switch forward direction or reverse service cell/sector, then whether former service cell/sector of forward/reverse or user terminal according to circumstances determine to remove when time interlace selection, perhaps interlace are selected new forward direction or reverse service cell/sector after advisory is given switching.New preceding/reverse service cell/sector is consulted whether need to remove current interlace and is selected.
Processing after processing after among the step S612 and the step S412 of embodiment one is similar.
The 3rd embodiment
In the present embodiment, provide a kind of asynchronous cell/section communicator, asynchronous cell/section communication method that provides in the above-described embodiments can be provided for it.
As shown in Figure 7, this device comprises: asynchronous cell/section is switched and determined unit 702, is positioned at subscriber terminal side, is used for judging that whether carrying out asynchronous cell/section switches; Interlace selected cell 704, be arranged in subscriber terminal side or former service cell/sector side (present embodiment, be positioned at subscriber terminal side), be used for when asynchronous cell/section is switched and determined the switching of unit 702 decisions carrying out asynchronous cell/section, select one or more suitable interlace, and report former service cell/sector; And service unit 706, be positioned at former service cell/sector side, be used on one or more interlace that interlace selected cell 704 is selected, serving for user terminal.
Wherein, the service carried out of service unit 706 comprises: only send down control channel information to user terminal on the one or more interlace that select; Only on the one or more interlace that select, distribute the up-downgoing traffic channel resource for user terminal; Only on an interlace on the one or more interlace that select, receive the ascending control channel information that the user sends; Only on the one or more interlace that select, receive the uplink ACK channel information that user terminal sends; Only on the one or more interlace that select, send descending ack channel information to user terminal.
Wherein, when asynchronous cell/section was switched and determined unit 702 and detects the non-current service synchronous subset that is in the Active Set and satisfy switching condition, decision was carried out asynchronous cell/section and is switched.Above-mentioned switching condition can be that the cell/section signal strength signal intensity of non-current service synchronous subset is better, can satisfy the switching target requirement of user terminal.
Interlace selected cell 704 is selected one or more interlace:(1 according in the following standard any one) avoid in two systems, sending ascending control channel information simultaneously according to self-ability; (2) avoid in two systems, sending ascending control channel information simultaneously and/or receiving down control channel information simultaneously according to self-ability; (3) avoid in two systems, sending reverse link traffic channel information simultaneously and/or receiving downlink traffic channel information simultaneously according to self-ability; (4) avoid in two systems, sending simultaneously the uplink ACK channel information and/or receive descending ack channel information simultaneously according to self-ability.
In addition, the channel resource that is distributed by scheduling and channel resource allocation unit 706 comprises: traffic channel resource, control channel resource and ack channel resource.
Preferably, further comprise according to the device of present embodiment: switching treatmenting unit 708, be connected to scheduling and channel resource allocation unit 706, be used to carry out hand-off process.
Switching treatmenting unit 708 further comprises: access exploration module 708-2, be positioned at subscriber terminal side, be used under the situation of the business of not interrupting former service cell/sector, initiate access exploration to target serving district/sector at the time slot that does not need to send signal to former service cell/sector; Switch preparation module 708-4, be positioned at subscriber terminal side, be used under the situation of the business of not interrupting former service cell/sector, initiate the indication of reverse pilot quality to target serving district/sector at the time slot that does not need to send signal to former service cell/sector; Insert and permit judging module 708-6, be positioned at target serving district/sector side, be connected to access exploration module 708-2, be used for behind target serving district/sector acquisition access exploration, whether decision permits user terminal is inserted; Time synchronized and power regulation module 708-8 are positioned at target serving district/sector side, are used to carry out time synchronized and power adjustment; Hand off signaling sending module 708-10, be positioned at subscriber terminal side, be connected to access allowance judging module 708-6, be used for giving target serving district/sector with new channel quality information and reverse request message report inserting under the situation of permitting the access of judging module 708-6 decision allowance user terminal; And interlace selects to remove module 708-12, be positioned at subscriber terminal side, be connected to insert and permit judging module 708-6, be used under the situation that access allowance judging module decision refusing user's terminal inserts, removing the interlace selection to former service cell/sector request and serving.
Alternatively, interlace selects to remove module 708-12 can be positioned at former service cell/sector side, and at this moment, it is removed interlace to user terminal requests and selects service.
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 (20)
1. an asynchronous cell/section communication method is characterized in that, may further comprise the steps:
First step, user terminal and former service cell/sector consult to select one or more suitable interlace to be used to carry out the asynchronous cell/section switching or to switch prepare, and confirm by signaling; And
Second step, after affirmation, described former service cell/sector is served for described user terminal on the described one or more interlace that select.
2. asynchronous cell/section communication method according to claim 1, it is characterized in that, in described first step, described user terminal is selected described one or more interlace:(1 according in the following principle any one) send reverse link traffic channel or ascending control channel or uplink ACK channel information in target cell/sector when avoiding sending reverse link traffic channel or ascending control channel or uplink ACK channel information on the former service cell/sector between two asynchronous cell/sections according to self-ability; (2) receive descending shared control signal channel or downlink traffic channel or descending ack channel information in target cell/sector when avoiding receiving descending shared control signal channel or downlink traffic channel or descending ack channel information on the former service cell/sector between two asynchronous cell/sections according to self-ability.
3. asynchronous cell/section communication method according to claim 2, it is characterized in that described former service cell/sector is sought described suitable interlace by the deviation that current absolute time and frame according to described former service cell/sector and target serving district/sector are provided with between the former service cell/sector of calculation of parameter and the target serving district/sector.
4. asynchronous cell/section communication method according to claim 2, it is characterized in that the delay situation of two sectors of described user terminal sends according to former service cell/sector and target serving district/sector time calibration information and own reception is sought described suitable interlace.
5. asynchronous cell/section communication method according to claim 1, it is characterized in that, in described second step, the service that described former service cell/sector is carried out comprises: only send down control channel information to user terminal on the described one or more interlace that select; Only on the described one or more interlace that select, distribute the up-downgoing traffic channel resource for user terminal; Only on an interlace on the described one or more interlace that select, receive the ascending control channel information that the user sends; Only on the described one or more interlace that select, receive the uplink ACK channel information that user terminal sends; Only on the described one or more interlace that select, send descending ack channel information to user terminal.
6. asynchronous cell/section communication method according to claim 1 is characterized in that, in described first step, described one or more interlace that described user terminal and described former service cell/sector consult to select are divided into two groups of uplink and downlink.
7. asynchronous cell/section communication method according to claim 1 is characterized in that, further may further comprise the steps:
Third step, after selecting, described user terminal is not needing to send switching preparation signaling or hand off signaling to target cell/sector on the reverse interlace of described former service cell/sector transmission signal.
8. asynchronous cell/section communication method according to claim 7, it is characterized in that, in described third step, signaling is prepared in the switching that described user terminal sends to described target cell/sector or hand off signaling comprises: the access exploration that sends on access channel; The reverse pilot indication that on the reverse pilot indicating channel, sends; The reverse request message that on reverse request channel, sends; The forward channel quality indication of on channel quality feedback channel, feeding back.
9. asynchronous cell/section communication method according to claim 8, it is characterized in that, how the described signaling decision that described target serving district/sector sends according to described user terminal is fed back or is not permitted described user terminal and insert: send under the situation of pilot tone indicating channel described target serving district/sector feedback pilot quality indication at described user terminal; Send at described user terminal under the situation of reverse request message or the indication of forward channel quality, whether described target serving district/sector according to permitting switching, and whether decision is dispatched described user terminal and sent control signaling.
10. asynchronous cell/section communication method according to claim 8, it is characterized in that, how the described signaling decision that described target serving district/sector sends according to described user terminal is fed back or is not permitted described user terminal and insert: send access exploration at user terminal, and permit under the situation of described user terminal access described target serving district/sector, and described target serving district/sector is to described user terminal feedback acknowledgment message; Send at described user terminal under the situation of reverse request message or the indication of forward channel quality, whether described target serving district/sector dispatches and sends control signaling for described user terminal according to whether permitting switching decision.
11. asynchronous cell/section communication method according to claim 10, it is characterized in that, described user terminal sends access probe synchronous and power adjustment with acquisition time, wherein, time synchronization information is carried in the described acknowledge message, and the power adjustment obtains by the exploration process that sends access probe.
12. asynchronous cell/section communication method according to claim 1 is characterized in that, before described first step, further may further comprise the steps:
Step a: user terminal adds Active Set with asynchronous cell/section;
Step b: when described user terminal or former service cell/sector detected certain cell/section in the non-current service synchronous subset that is in the Active Set and satisfy the interlace alternative condition, decision was carried out interlace and is selected.
13. asynchronous cell/section communication method according to claim 12 is characterized in that, the load that the channel quality that described interlace alternative condition is described cell/section is higher than predetermined threshold or former service cell/sector is higher than certain thresholding.
14. an asynchronous cell/section communicator is characterized in that, comprising:
Asynchronous cell/section is switched and determined the unit, is positioned at subscriber terminal side, is used for judging that whether carrying out asynchronous cell/section switches;
The interlace selected cell, be positioned at subscriber terminal side or former service cell/sector side, be used for when the asynchronous cell/section switching is carried out in described asynchronous cell/section switch judgement part decision, selecting one or more suitable interlace, and reporting former service cell/sector; And
Service unit is positioned at former service cell/sector side, is used for serving for described user terminal on described one or more interlace that described interlace selected cell is selected.
15. asynchronous cell/section communicator according to claim 14, it is characterized in that described interlace selected cell is selected described one or more interlace:(1 according in the following principle any one) avoid in two systems, sending ascending control channel information simultaneously according to self-ability; (2) avoid in two systems, sending ascending control channel information simultaneously and/or receiving down control channel information simultaneously according to self-ability; (3) avoid in two systems, sending reverse link traffic channel information simultaneously and/or receiving downlink traffic channel information simultaneously according to self-ability; (4) avoid in two systems, sending simultaneously the uplink ACK channel information and/or receive descending ack channel information simultaneously according to self-ability.
16. asynchronous cell/section communicator according to claim 14, it is characterized in that, when described asynchronous cell/section was switched and determined the unit and detects the non-current service synchronous subset that is in the Active Set and satisfy switching condition, decision was carried out asynchronous cell/section and is switched.
17. asynchronous cell/section communicator according to claim 16 is characterized in that, described switching condition is: the cell/section signal strength signal intensity of described non-current service synchronous subset is better, can satisfy the switching target requirement of described user terminal.
18. asynchronous cell/section communicator according to claim 14 is characterized in that, the service that described service unit carries out comprises: only send down control channel information to user terminal on the described one or more interlace that select; Only on the described one or more interlace that select, distribute the up-downgoing traffic channel resource for user terminal; Only on an interlace on the described one or more interlace that select, receive the ascending control channel information that the user sends; Only on the described one or more interlace that select, receive the uplink ACK channel information that user terminal sends; Only on the described one or more interlace that select, send descending ack channel information to user terminal.
19. asynchronous cell/section communicator according to claim 14, it is characterized in that, described scheduling and channel resource allocation unit are not described subscriber terminal service on the nonoptional interlace of described user terminal, initiate handoff request so that reserve the space for described user terminal to target serving district/sector.
20. asynchronous cell/section communicator according to claim 14 is characterized in that, further comprises: switching treatmenting unit, be connected to described scheduling and channel resource allocation unit, be used to carry out hand-off process, described switching treatmenting unit further comprises:
The access exploration module is positioned at subscriber terminal side, is used under the situation of the business of not interrupting described former service cell/sector, initiates access exploration at the time slot that does not need to send signal to described former service cell/sector to target serving district/sector;
Switch preparation module, be positioned at subscriber terminal side, be used under the situation of the business of not interrupting described former service cell/sector, initiate the indication of reverse pilot quality to target serving district/sector at the time slot that does not need to send signal to described former service cell/sector;
Insert and permit judging module, be positioned at target serving district/sector side, be connected to described access exploration module, be used for behind the described access exploration of described target serving district/sector acquisition, whether decision permits described user terminal is inserted;
Time synchronized and power regulation module are positioned at target serving district/sector side, are used to carry out time synchronized and power adjustment;
The hand off signaling sending module, be positioned at subscriber terminal side, be connected to described access and permit judging module, be used for permitting the judging module decision and permit giving described target serving district/sector with new channel quality information and reverse request message report under the situation of described user terminal access in described access; And
Interlace selects to remove module, be positioned at subscriber terminal side or former service cell/sector side, be connected to described access and permit judging module, be used for permitting under the situation of the described user terminal access of judging module decision refusal in described access, request is removed interlace and is selected service.
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| CNA2006101449206A CN101193046A (en) | 2006-11-22 | 2006-11-22 | Asynchronous cell/section communication method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102461313A (en) * | 2009-04-28 | 2012-05-16 | 英特尔公司 | Feedback channel release |
| CN104539401A (en) * | 2014-12-16 | 2015-04-22 | 北京邮电大学 | Self-adaption precoding method, base station and system |
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2006
- 2006-11-22 CN CNA2006101449206A patent/CN101193046A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102461313A (en) * | 2009-04-28 | 2012-05-16 | 英特尔公司 | Feedback channel release |
| CN104539401A (en) * | 2014-12-16 | 2015-04-22 | 北京邮电大学 | Self-adaption precoding method, base station and system |
| CN104539401B (en) * | 2014-12-16 | 2019-08-16 | 北京邮电大学 | A kind of adaptive pre-encoding method, base station and system |
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