CN101001437A - Method for distributing CTS of common base station - Google Patents

Method for distributing CTS of common base station Download PDF

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Publication number
CN101001437A
CN101001437A CNA2006100007148A CN200610000714A CN101001437A CN 101001437 A CN101001437 A CN 101001437A CN A2006100007148 A CNA2006100007148 A CN A2006100007148A CN 200610000714 A CN200610000714 A CN 200610000714A CN 101001437 A CN101001437 A CN 101001437A
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obs
octs
base station
round robin
people
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CNA2006100007148A
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CN101001437B (en
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邬旭永
赵泉波
潘众
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN2006100007148A priority Critical patent/CN101001437B/en
Priority to JP2008548915A priority patent/JP4809442B2/en
Priority to PCT/CN2006/003142 priority patent/WO2007079644A1/en
Publication of CN101001437A publication Critical patent/CN101001437A/en
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Publication of CN101001437B publication Critical patent/CN101001437B/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

This invention provides a method for distributing CTS of a coexistence base station including: dividing the CTS of the coexistence base station into ICTS (coexistence special time slice used in initializing a base station) and OCTS (special time slice used in a working base station), in which, said ICTS is occupied by IBS (a started base station) and said OCTS is occupied by OBS (the base station in operation) according to the OCTS occupation rule'which can realize that IBS and OBS share the CTS slot in time-sharing in a community of a same channel to broadcast its own liason information.

Description

The method of distributing CTS of common base station
Technical field
The present invention relates to communication field, relate in particular to the method for a kind of compossibility base station assigns CTS (compossibility time slot).
Background technology
The broadband access method that BWA (Broadband wireless access, broadband wireless access) equipment can be provided convenience for the user.BWA equipment based on proprietary protocol is arranged at present, the BWA equipment based on standard agreement is also arranged.Wireless access wide band technology is just flourish at present, utilizes Radio Resource to carry out the technology that inserts the metropolitan area, broadband and has the very strong vitality and the market space.
Wireless frequency spectrum resource is very valuable.Particularly do not have the frequency range of permission, the operation of a plurality of base stations is often arranged on identical channel, cause the signal phase mutual interference of different base station in some zones of not planning well or some.Therefore, in order to coordinate with the coexistence between each base station equipment under the frequency range, especially the coexistence between each base station equipment of exempting from the licensed band need be set up the coexistence mechanism between some base station equipments.
In order to describe the present invention better, we introduce the definition at adjacent station earlier.
Adjacent station has been meant common overlay area, and contains the base station of effective terminal in the common overlay area.Than in the network as shown in FIG. 1, though BS1 and BS2 geography are very near, and BS1 and BS2 website itself are separately all in the other side's overlay area, owing to do not have effective terminal in the common overlay area of BS1 and BS2 website, therefore, the not very adjacent station of BS1 and BS2 website.Though and overlapping region is smaller between BS2 and BS3, separately not in the other side's overlay area, effective terminal in the overlapping coverage area constitutes the other side's wireless network is caused interference, so BS2 and BS3 are called adjacent station.
In the compossibility base station system, often require must guarantee between each base station the phase mutually synchronization of transmitting-receiving, require the regularly strict alignment of transmission, received signal frame between each base station, so just can ensure and can not cause mutual transmitting-receiving to disturb between the close website in geographical position.For example, BS1 in Fig. 1 and BS2, if BS1 BS2 when sending out is receiving, then BS1 can cause serious disturbance to the signal that BS2 receives subordinate terminal.
In the compossibility base station system,, hold consultation mutually between the adjacent station for solving the compossibility problem.When distributing interface-free resources, the base station will utilize competitive interface-free resources (as time period, subchannel etc.) that data are sent to the terminal in noiseless zone, and utilize the interface-free resources (as time period, subchannel etc.) that exclusively enjoys to send data to the terminal in disturbed area territory.
Therefore, the base station of moving need be known the state that terminal is disturbed constantly, needs to understand each terminal and whether is disturbed and be subjected to which base station interference, consults coexistence mechanism so that can carry out between the base station.
In order to describe the present invention better, we introduce the definition of position community (GeographyCommunity) and people having a common goal community (CC-Community).
Position community is the set that is in one group of base station under the same environment, the subclass of forming by wherein any one base station or part base station all at least with this position community in but the base station that do not belong to this subclass has effectively common overlay area.
Such as, in network shown in Figure 2, BS1, BS2, BS3, BS4 form a C1 of position community jointly.Though and BS5 has overlapping overlay area with BS3,,, but form the C2 of position community independently so BS5 does not belong to the C1 of position community owing to do not have effective terminal in this overlapping region.For BS6 and BS7, they itself do not belong to the C1 of position community, but form the C3 of another position community.
People having a common goal community is meant the set that is in the one group of base station that works in same channel under the same environment, the subclass of forming by wherein any one base station or part base station all at least with this community in but the base station that do not belong to this subclass has effectively common overlay area.
Such as, in network shown in Figure 3, all base stations all work in same channel except that BS4, and then BS1, BS2, BS3 form a C1 of people having a common goal community jointly.Though and BS4 has effectively common overlay area with BS1, BS3, because BS4 works in different channels, so do not belong to C1.Though and BS5 has overlapping overlay area with BS3, owing to do not have effective terminal in this overlapping region, so BS5 does not belong to the C1 of people having a common goal community.For BS6 and BS7, they and BS1, BS2 and BS3 do not have to overlap, and do not belong to the C1 of people having a common goal community, but form the C3 of another people having a common goal community.
After each base station in the people having a common goal community and its interference base station were consulted fair share channel width, the whole frame time of the interference-free work of acquisition was called the main frame of using.
Such as, in network shown in Figure 4, BS1, BS2 and BS3 take same channel, constitute a people having a common goal community, and effective overlay area is all arranged between the base station in twos each other, promptly adjacent each other station.Master maximum in this people having a common goal community is 3 with the frame number, and as shown in Figure 5, three base stations of BS1, BS2 and BS3 have a master respectively and use frame.
In the compossibility base station system, often in the original physical frame formats in base station, open up one section sheet when idle as CTS (compossibility time slot), CTS comprises DCTS (the special-purpose timeslice of descending coexistence) and UCTS (up coexistence special use timeslice).The compossibility base station comprises that IBS (base station that begins to start), OBS (base station of moving) and terminal can utilize these timeslices to finish the transmission of compossibility message.
The time parameter of above-mentioned CTS comprises:
T CTSstart: the time deviation of CTS time slot and frame start position;
T CTSdurat: the length of CTS time slot;
N CTSstart: the FN (frame number) that begins to occur first CTS;
N CTSintv: the frame period that each CTS occurs.
The above-mentioned time parameter of the CTS of each base station is arranged by all base stations in system and is known altogether.Carry out the transmission of compossibility message for fully effectively utilizing the compossibility time slot between solution compossibility base station, as shown in Figure 6, the CTS of each base station need distribute between the base station effectively.
A kind of method of CTS of distributing between the compossibility base station is in the prior art:
CTS (comprising DCTS and UCTS) only uses in the new neighbour who starts base station (comprising IBS/OBS) stands discovery procedure.This method comprises between IBS and the OBS between wired contact, IBS and the OBS that two of no wired contact are deeply in love condition.
When between IBS and the OBS during wired contact, as shown in Figure 7, in the start-up course of SBS1, the interactive processing process between SBS1, terminal A and the WBS1 comprises the steps:
1, SBS1 starts and finishes the wireline side initialization, obtain with adjacent station and carry out the information that wired connection is used, as our station IP address etc., selected wireless channel, utilize DCTS to send the contact request message then, comprise the information such as IP address of SBS1 in this contact request message to all terminals (comprising terminal A) of eating dishes without rice or wine to reach;
2, terminal A intercepts and captures this contact request message, and sends the request of coexistence information reporting to former affiliated base station WBS1 after the satellite information, receives the qualified terminal of the contact request message on the DCTS, all can send the request of coexistence information reporting by the WBS1 under it;
3, WBS1 know report request after, report coexistence message dedicated bandwidth and specify its information reporting that coexists for designated terminal distributes, for example, if two terminals of A, B are all applied for the information reporting that coexists, and WBS1 can specify A wherein to report its compossibility message of receiving, also the terminal that can allow all applications report reports in regular turn;
4, after terminal A received and reports indication, the contact request message that the SBS1 that obtains is sent reported WBS1;
5, after WBS1 receives the contact request message that terminal A reports, send contact message by wired network to SBS1 with information (as the IP address etc.) according to wired contact of obtaining;
6, SBS1 is known itself and the contact method of adjacent station WBS1 from this message, sends the contact message by wired network to WBS1 then, and WBS1 has set up effective wired contact between SBS1 and WBS1 behind wired contact message that receives SBS1 once more.Thereafter both sides just can begin to comprise the various information interactions of compossibility negotiation.
When between IBS and the OBS during no wired contact, as shown in Figure 8, in the start-up course of SBS1, the contact of OBS and IBS needs DCTS and UCTS to finish jointly, and the interactive processing process between SBS1, terminal A and the WBS1 comprises the steps:
1, SBS1 starts and finishes the wireline side initialization, obtain with adjacent station and carry out the information that wired connection is used, as our station IP address etc., selected wireless channel, utilize DCTS to send the contact request message then, comprise the information such as IP address of SBS1 in this contact request message to all terminals (comprising terminal A) of eating dishes without rice or wine to reach;
2, terminal A intercepts and captures this contact request message, and sends the request of coexistence information reporting to former affiliated base station WBS1 after the satellite information, receives the qualified terminal of the contact request message on the DCTS, all can send the request of coexistence information reporting by the WBS1 under it;
3, WBS1 know report request after, report coexistence message dedicated bandwidth and specify its information reporting that coexists for designated terminal distributes, for example, if two terminals of A, B are all applied for the information reporting that coexists, and WBS1 can specify A wherein to report its compossibility message of receiving, also the terminal that can allow all applications report reports in regular turn;
4, after terminal A received and reports indication, the contact request message that the SBS1 that obtains is sent reported WBS1;
5, after WBS1 judges according to the information that receives, select one or more reporting terminals as CLSS (compossibility contact terminal), send contact message by common down going channel to CLSS, and indication CLSS utilizes its UCTS should get in touch with forwards to SBS1.
6, after CLSS receives contact message, utilize UCTS to send the contact message of WBS1 to SBS1;
7, SBS1 is known the contact message of its adjacent station WBS1 from above-mentioned contact message, then, utilizes its DCTS to send compossibility message to the CLSS of above-mentioned WBS1 appointment;
8, CLSS will receive the compossibility message buffering of SBS1 and report WBS1.Between SBS1 and WBS1 set up the valid wireless contact thereafter.Thereafter both sides just can begin to comprise the various information interactions of compossibility negotiation.
The shortcoming of said method is: this method is found the adjacent station of interference that CTS is used for (comprising DCTS and UCTS) the base station initialization procedure, the CTS time slot only is used to send the contact message that comprises the IP address by IBS, and the contact between IBS and OBS during no wired reaching between the base station.Therefore, this method can only be collected the interfere information of IBS to the OBS subordinate terminal.The mechanism that does not provide OBS to utilize the compossibility time slot to because the information that the terminal that operational terminal change in location or OBS change in location cause is disturbed by OBS can not in time be collected, also just can't be consulted co-existence schemes again.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide the method for a kind of compossibility base station assigns CTS, thereby can realize the time sharing shared CTS time slot of IBS, OBS in the people having a common goal community, broadcast the contact information of oneself.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method of distributing CTS of common base station comprises:
A, the compossibility time slot CTS of compossibility base station is divided into the special-purpose timeslice ICTS of the coexistence that is used for the initialization base station and is used for the special-purpose timeslice OCTS of coexistence of work base station;
B, described ICTS are taken by the base station IBS that begins to start, and described OCTS takies rule by the base station OBS that is moving according to the OCTS that sets and takies.
Described steps A specifically comprises:
Described ICTS occurred in CTS according to the ICTS cycle of setting, and this ICTS cycle and original position are unified in area of setting and zone, and in common knowledge by the compossibility base station in all this areas and zone.
Described steps A specifically comprises:
Be described OCTS except other time slot that is divided into ICTS among the described CTS, the OCTS that distributes to each OBS use occurs in CTS according to the OBS round robin cycle of setting, this OBS round robin cycle is unified agreement in people having a common goal community, and in common knowledge by the compossibility base station in all people having a common goal communities.
Described OBS round robin cycle can but to be not limited to be the integral multiple in ICTS cycle.
Described step B specifically comprises:
Described IBS becomes before the OBS parameter according to described ICTS cycle and position and the CTS that knows altogether, obtains the information of described ICTS, and take described ICTS in initialization procedure, no longer takies this ICTS in the normal work stage after IBS becomes OBS.
Described step B specifically comprises:
If B1 OBS has obtained the available free frequency, then this OBS takies any available OCTS in the described OBS round robin cycle; Otherwise, execution in step B2;
B2, described OBS take rule according to the OCTS of the setting in the people having a common goal community under it, obtain this OBS and take the position of OCTS in described OBS round robin cycle, and take corresponding OCTS.
Described step B2 specifically comprises:
When the available OCTS in the described OBS round robin cycle distributes between each OBS and adjacent station thereof, two base stations that constitute adjacent station can not take same OCTS, be not two base stations at adjacent station can take identical OCTS the time, described OBS takies the OCTS time slot that is not taken by its adjacent station in the described OBS round robin cycle.
Described B2 specifically comprises:
Available OCTS number in the OBS round robin cycle of described people having a common goal community must be greater than the main frame number of use of this people having a common goal community, and described OBS comprises that according to the main acquisition that puts in order with frame at this base station and adjacent station thereof this base station and neighbour thereof stand in the position that takies OCTS in the described OBS round robin cycle.
Described master obtains after the coexistence negotiation is finished at compossibility base station and neighbour station with putting in order of frame, perhaps after the information that OBS discovery cochannel disturbs the neighbour to stand changes, with neighbour station negotiation back acquisition again.
Described step B2 also comprises:
After OBS added people having a common goal community, the available OCTS number in this people having a common goal community in the OBS round robin cycle of original agreement was used the frame number less than the main of this people having a common goal community, and then this people having a common goal community need unify to increase the length of described OBS round robin cycle.
Described step B2 also comprises:
When causing more than one people having a common goal community, OBS merges, maximum OBS round robin cycle in all people having a common goal communities before the OBS round robin cycle of the people having a common goal community after then merging is selected to merge, use the frame number when the available OCTS number in this maximum OBS round robin cycle less than the main of the people having a common goal community after merging, then increase the length of this maximum OBS round robin cycle.
Described step B2 specifically comprises:
Available OCTS in described OBS round robin cycle is all base station unified distributions in people having a common goal community, and when each base station took different OCTS, described OBS took the OCTS time slot that is not taken by other base station in the people having a common goal community in the described OBS round robin cycle.
Described B2 also comprises:
Available OCTS number in the OBS round robin cycle of described people having a common goal community must be greater than the base station number of this people having a common goal community.
Described step B2 specifically comprises:
When the available OCTS in the described OBS round robin cycle at OBS and have on every side between the base station of overlapping coverage area and distribute, there are two base stations of overlapping coverage area can not take same OCTS, when not having two base stations of overlapping coverage area can take same OCTS each other, described OBS take in the described OBS round robin cycle not by with its OCTS time slot that has the base station of overlapping coverage area to take.
Described B2 also comprises:
Available OCTS number in the OBS round robin cycle of described people having a common goal community must be greater than the overlapping base station number of the maximum in this people having a common goal community.
Described step B also comprises:
The mapping table that each OCTS in OBS in the described OBS round robin cycle of maintenance record is taken by each OBS respectively, OBS selects and takies corresponding OCTS according to this mapping table.
As seen from the above technical solution provided by the invention, the present invention distributes to IBS and takies by a certain proportion of CTS being divided into ICTS (the special-purpose timeslice of coexistence that is used for the initialization base station), remaining CTS is divided into OCTS (the special-purpose timeslice of coexistence that is used for the work base station), distributing to all compossibility OBS liberally takies, thereby can realize the time sharing shared CTS time slot of IBS, OBS in the people having a common goal community, broadcast the contact information of oneself.
The present invention is when having guaranteed that IBS utilizes the ICTS time slot to finish the interference discovery procedure at the adjacent station of initialization, OBS also can utilize the OCTS time slot to finish regular Interference Detection process between OBS, and OBS can detect because the interfere information that (from a disturbed area territory to another disturbed area territory) cause is moved in the subordinate terminal position changes; Can detect because base station location changes or remove the variation that the operational terminal that brings the base station is subjected to interfere information.Can finish the interfere information that is subjected to that just adds the new operational terminal of OBS after IBS starts collects.OBS can change according to detected interfere information, carries out the negotiation between follow-up OBS.
Description of drawings
Fig. 1 is an adjacent station conceptual schematic view;
Fig. 2 is a position community networking schematic diagram;
Fig. 3 is a people having a common goal community networking schematic diagram;
Fig. 4 is the schematic diagram that BS1, BS2 and BS3 constitute a people having a common goal community;
Fig. 5 is that BS1, BS2 and three base stations of BS3 have a main schematic diagram with frame respectively;
Fig. 6 is for distributing the schematic diagram of CTS effectively between the base station;
Fig. 7 is for when between IBS and the OBS during wired contact, in the start-up course of SBS1, and the interactive processing process flow diagram between SBS1, terminal A and the WBS1;
Fig. 8 is for when between IBS and the OBS during no wired contact, in the start-up course of SBS1, and the interactive processing process flow diagram between SBS1, terminal A and the WBS1;
Fig. 9 is the process chart of the specific implementation of the method for the invention;
Figure 10 is the networking schematic diagram of embodiment of the present invention;
Figure 11 is that each base station obtains corresponding Master Subframe schematic diagram among the embodiment of the present invention;
Figure 12 is a people having a common goal community topology schematic diagram among the embodiment of the present invention.
Embodiment
The invention provides the method for a kind of compossibility base station assigns CTS.Core of the present invention is: in people having a common goal community, a certain proportion of CTS is distributed to IBS take, remaining CTS fair allocat takies for all compossibility OBS.
Describe the present invention in detail below in conjunction with accompanying drawing, the handling process of the specific implementation of the method for the invention comprises the steps: as shown in Figure 9
Step 9-1, the CTS of compossibility base station is divided into ICTS and OCTS.
The present invention is divided into two classes: ICTS and OCTS at initialization base station and work base station with CTS on the basis of CTS definition.
For make the initialization base station more convenient, find available CTS time slot reliably, specially CTS is divided into ICTS according to a certain percentage, this ICTS specific assigned is used to IBS.
The relevant information of ICTS comprises:
The ICTS cycle (ICTS Cycle): expression ICTS periodically takies cycle time of CTS or CTS number that should the time correspondence or should time corresponding physical frame number;
Must be unified in CTS and the ICTS parameter position community in the zone, each new startup base station can be according to the definite time of the ICTS of CTS that knows altogether and ICTS parameter acquisition initialization base station broadcast message.
Such as, can arrange CTS per 2 NOccur one among the individual FN, i.e. N CTSintv=2 N, FN is by N CTSintvDivide exactly surplus N CTSstartFrame be provided with CTS.The numbering that can represent each CTS with CTSN, this CTS also can simply be set to ICTS per 2 just as ICTS when CTSN was divided exactly by the ICTS cycle NOccur one among the individual CTS.
CTS except ICTS is divided into OCTS, OCTS in people having a common goal community by each OBS by appointment rule take respectively.
The relevant information of OCTS comprises:
1, adjacent station call number (Neighbor Index), i.e. the call number of each adjacent station information correspondence, each adjacent station information and the corresponding neighbour call number of standing can be represented with following form.
Table 1: adjacent station information and the corresponding neighbour call number signal table of standing
Index Neighbor BSID Neighbor BS IPaddress
1 48bitS BSID 32bits BSID
2 。。。 。。。
3 。。。 。。。
。。 。。。 。。。
2, OBS round robin cycle (OBS RR Cycle): this parameter is the round robin cycle of OBS group, and expression OBS periodically takies cycle time of CTS or CTS number that should the time correspondence or should time corresponding physical frame number or the number in ICTS cycle that should the time correspondence.OBS in the repeating query group selects to take one's own OCTS by this cycle.As for maintaining easily, can select the OBS round robin cycle is ICTS cycle integral multiple, calculates granularity and can calculate with CTSN, also can be with the ICTS computation of Period.OBS round robin cycle parameter is inner necessary unified in people having a common goal community, and can consult to revise between the inner base station of people having a common goal community.
3, OBS RR Map: this parameter takies the mapping map of the OCTS in the OBS round robin cycle for each base station.Suppose that the ICTS cycle is 4, the OBS round robin cycle is two ICTS cycles, and there is the adjacent station of 4 OBS this base station, promptly has 5 Master Subframe in the people having a common goal community at least, and then OBS RR Map can represent with following form:
Table 2, OBS RR Map illustrate to show
The OCTS station location marker 0 1 2 3 4 5 6 7
Take the base station IBS reserves BS1 BS4 BS3 IBS reserves BS2 Our station Idle
Last table has reflected that each base station takies the position of OCTS resource in the OBS round robin cycle, can number identify with different OCTS station location markers, it is the CTS that occurs in the cycle with the OBS round robin cycle that each OCTS position is pointed to one group, except keep for IBS, can be used as resource allocation and use for an OBS.An OBS round robin cycle has 8 CTS time slots in the table, and wherein two is ICTS, keeps for IBS to use, and other 6 is OCTS, distributes to OBS and uses, because only there are 4 adjacent stations this base station, so only taken 5 CTS time slots, is arranged 1 CTS time slot free time.
All safeguarding above-mentioned OCTS relevant information in the database of each OBS.
Step 9-2, IBS obtain the ICTS time slot of reservation when starting, after finishing compossibility initialization negotiation, take rule according to unified OCTS, obtain to distribute to the OCTS time slot of oneself.
The rule of taking the OCTS in the OBS round robin cycle for each base station assigns in the people having a common goal community can have following three kinds:
1, the available OCTS in the OBS round robin cycle distributes between each work base station and adjacent station thereof, and two base stations that constitute adjacent station can not take same OCTS, and each base station is as long as safeguard oneself and the engaged position at adjacent station;
2, all base station unified distributions in people having a common goal community of the available OCTS in the OBS round robin cycle, each base station takies different OCTS, and the engaged position of all base stations in the people having a common goal community will be safeguarded in each base station;
3, the available OCTS in the OBS round robin cycle is in the base station and have on every side between the base station of overlapping coverage area and distribute, have two base stations of overlapping coverage area can not take same OCTS, each base station will be safeguarded oneself and the engaged position of the base station of overlapping coverage area is arranged on every side.
In the compossibility base station system, IBS is when starting, when the adjacent station of the interference of carrying out above-mentioned base station initialization procedure is found, at first obtain the ICTS time slot of reserving to IBS in the above-mentioned OBS round robin cycle, be used to send the contact message that comprises the IP address, and between the base station, during no wired reaching, send the contact message between IBS and OBS.
IBS becomes OBS after finishing compossibility initialization negotiation after startup.
At this moment, if OBS has obtained an available free frequency, then this OBS can select any CTS except keeping for ICTS in above-mentioned OBS round robin cycle, as the OCTS of this OBS.
If OBS does not obtain an available free frequency, then this OBS is by after consulting to obtain shared channels with other adjacent stations, takies the rule of OCTS according to above-mentioned three kinds of base stations, by the corresponding OCTS of following processing selecting.
1, at above-mentioned regular 1, OCTS is identified at the situation of distributing between base station and adjacent station thereof:
When IBS by after consulting shared channels and obtain Master Subframe with other adjacent stations, IBS can take the OCTS time slot position except having been taken by its adjacent station in the OBS round robin cycle, as for easy and keep consistency, can obtain comprise this base station and the adjacent position that takies OCTS that stands among the OBS RR Map thereof according to the putting in order of Subframe at base station and adjacent station thereof.
Such as, as shown in figure 10, new base station BS 5 adds the CC-Community that BS1, BS2, a BS3 and BS4 base station has been arranged, and each base station of BS1 to BS5 obtains corresponding MasterSubframe as shown in figure 11 through after consulting.Suppose that the ICTS cycle is 4, the OBS round robin cycle is 8, and then according to the order of Master Subframe between BS, the OBS RR Maps of base station BS 5 correspondences is as shown in the table.
The OBS RR Maps signal table of table 3, base station BS 5
OCTS station location marker number 0 1 2 3 4 5 6 7
Take the base station IBS reserves BS4 Our station (BS5) BS3 IBS reserves Idle Idle Idle
When selecting OCTS according to this rule, owing to always constitute adjacent station among the same CC-Community between the base station in twos each other, so this mapping graph content each base station in same CC-Community may be inequality, promptly same OCTS may be taken by two or more base stations that do not constitute adjacent station each other.But with the inner OBS round robin cycle of a CC-Community is unified.
OCTS number in the OBS round robin cycle must be greater than Master Subframe number, cause Master Subframe to increase as increasing the people having a common goal base station in the people having a common goal community newly, and the OCTS number in the OBS round robin cycle of original people having a common goal community internal unity is less than or equal to Master Subframe number, and OBS round robin cycle parameter need be changed with other base station negotiate in then newly-increased base station.
If because the adding of new base station, caused the merging of two above CC-Community, and the OBS round robin cycle parameter of different CC-Community may be also different, and the OBS round robin cycle parameter of the CC-Community after then merging should consult to select maximum OBS round robin cycle parameter.Use the frame number when the available OCTS number in this maximum OBS round robin cycle less than the main of the people having a common goal community after merging, then increase the length of this maximum OBS round robin cycle.
When selecting OCTS according to this rule, can obtain the peak use rate of current OCTS, but may exist two not to be adjacent station but the situation of identical OCTS is used in base station with overlapping coverage area, and when the new terminal of two base stations attempts to insert certain base station in this zone, can cause to disturb between the base station because of two base station identical OCTS of use and know and follow-up negotiation that new terminal can't be realized inserting.
2, at above-mentioned regular 2, the OCTS in the OBS round robin cycle is in the base station and the situation of distributing between the base station of overlapping coverage area arranged on every side.
With people having a common goal community topology shown in Figure 12 is example: existing 4 base stations before new base station BS 5 starts, and wherein BS2, BS3 are the neighbour station of new base station BS 5, BS4 and BS5 have overlapping coverage area but do not constitute adjacent station.According to this criterion, BS5 can not select the OCTS identical with the base station that overlapping coverage area is arranged.
Suppose that BS1, BS2, BS3 and BS4 take the 1st, 2,3, No. 1 OCTS position (BS4 and BS1 do not have overlapping region can be shared) respectively, then new base station BS 5 must be selected for use and be different from the OCTS that BS2, BS3, BS4 take, as table 4, it is 5 OCTS position that BS5 has taken identification number according to idle selective sequential.
The OBS RR Maps signal table of table 4, base station BS 5
OCTS station location marker number 0 1 2 3 4 5 6 7
Take the base station IBS reserves BS4 BS2 BS3 IBS reserves Our station (BS5) Idle Idle
When selecting OCTS according to this rule, the OCTS number that can distribute to the work base station in the OBS round robin cycle must be greater than the overlapping base station number of the maximum in this people having a common goal community, does not exist two not to be adjacent station but the situation of identical OCTS is used in base station with overlapping coverage area.When the new terminal of these two base stations attempts to insert certain base station in the overlapping coverage area of two base stations, also know and follow-up negotiation that with regard to not causing to disturb between the base station new terminal of this new region can't be realized inserting because two base stations use identical OCTS.
3, at above-mentioned regular 3, the situation of all base stations unified distributions in people having a common goal community of the OCTS in the OBS round robin cycle:
Same is example with people having a common goal community topology shown in Figure 12: existing 4 base stations before new base station BS 5 starts, and preceding 4 OCTS positions have been selected for use as following table 5, the 5th the OCTS position that BS5 can only take, though the neighbour station of BS5 has only BS3, BS4, but according to allocation rule, BS5 can not take identical OCTS with BS1, the BS2 in the people having a common goal community.
Table 5: the OBS RR Maps signal table of base station BS 5
OCTS station location marker number 0 1 2 3 4 5 6 7
Take the base station IBS reserves BS1 BS2 BS3 IBS reserves BS4 Our station (BS5) Idle
When selecting OCTS according to this rule, the OCTS number that can distribute to the work base station in the OBS round robin cycle must be greater than the base station number of this people having a common goal community.Though the utilance of OCTS is low, but do not exist two base stations to take the situation of same OCTS, may exist in the people having a common goal community two use identical OCTS, are not that adjacent station but base station with overlapping coverage area can be resolved in the problem that overlapping coverage area inserts new terminal.
OBS can utilize the contact information of the OCTS time slot broadcasting oneself of acquisition, finishes the regular Interference Detection process between OBS, changes the negotiation of carrying out between follow-up OBS according to detected interfere information.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.

Claims (16)

1, a kind of method of distributing CTS of common base station is characterized in that, comprising:
A, the compossibility time slot CTS of compossibility base station is divided into the special-purpose timeslice ICTS of the coexistence that is used for the initialization base station and is used for the special-purpose timeslice OCTS of coexistence of work base station;
B, described ICTS are taken by the base station IBS that begins to start, and described OCTS takies rule by the base station OBS that is moving according to the OCTS that sets and takies.
2, method according to claim 1 is characterized in that, described steps A specifically comprises:
Described ICTS occurred in CTS according to the ICTS cycle of setting, and this ICTS cycle and original position are unified in area of setting and zone, and in common knowledge by the compossibility base station in all this areas and zone.
3, method according to claim 2 is characterized in that, described steps A specifically comprises:
Be described OCTS except other time slot that is divided into ICTS among the described CTS, the OCTS that distributes to each OBS use occurs in CTS according to the OBS round robin cycle of setting, this OBS round robin cycle is unified agreement in people having a common goal community, and in common knowledge by the compossibility base station in all people having a common goal communities.
4, method according to claim 3 is characterized in that, described OBS round robin cycle can but to be not limited to be the integral multiple in ICTS cycle.
5, according to claim 1,2,3 or 4 described methods, it is characterized in that described step B specifically comprises:
Described IBS becomes before the OBS parameter according to described ICTS cycle and position and the CTS that knows altogether, obtains the information of described ICTS, and take described ICTS in initialization procedure, no longer takies this ICTS in the normal work stage after IBS becomes OBS.
6, according to claim 1,2,3 or 4 described methods, it is characterized in that described step B specifically comprises:
If B1 OBS has obtained the available free frequency, then this OBS takies any available OCTS in the described OBS round robin cycle; Otherwise, execution in step B2;
B2, described OBS take rule according to the OCTS of the setting in the people having a common goal community under it, obtain this OBS and take the position of OCTS in described OBS round robin cycle, and take corresponding OCTS.
7, method according to claim 6 is characterized in that, described step B2 specifically comprises:
When the available OCTS in the described OBS round robin cycle distributes between each OBS and adjacent station thereof, two base stations that constitute adjacent station can not take same OCTS, be not two base stations at adjacent station can take identical OCTS the time, described OBS takies the OCTS time slot that is not taken by its adjacent station in the described OBS round robin cycle.
8, method according to claim 7 is characterized in that, described B2 specifically comprises:
Available OCTS number in the OBS round robin cycle of described people having a common goal community must be greater than the main frame number of use of this people having a common goal community, and described OBS comprises that according to the main acquisition that puts in order with frame at this base station and adjacent station thereof this base station and neighbour thereof stand in the position that takies OCTS in the described OBS round robin cycle.
9, method according to claim 8, it is characterized in that, described master obtains after the coexistence negotiation is finished at compossibility base station and neighbour station with putting in order of frame, perhaps after the information that OBS discovery cochannel disturbs the neighbour to stand changes, with neighbour station negotiation back acquisition again.
10, method according to claim 8 is characterized in that, described step B2 also comprises:
After OBS added people having a common goal community, the available OCTS number in this people having a common goal community in the OBS round robin cycle of original agreement was used the frame number less than the main of this people having a common goal community, and then this people having a common goal community need unify to increase the length of described OBS round robin cycle.
11, method according to claim 8 is characterized in that, described step B2 also comprises:
When causing more than one people having a common goal community, OBS merges, maximum OBS round robin cycle in all people having a common goal communities before the OBS round robin cycle of the people having a common goal community after then merging is selected to merge, use the frame number when the available OCTS number in this maximum OBS round robin cycle less than the main of the people having a common goal community after merging, then increase the length of this maximum OBS round robin cycle.
12, method according to claim 6 is characterized in that, described step B2 specifically comprises:
Available OCTS in described OBS round robin cycle is all base station unified distributions in people having a common goal community, and when each base station took different OCTS, described OBS took the OCTS time slot that is not taken by other base station in the people having a common goal community in the described OBS round robin cycle.
13, method according to claim 12 is characterized in that, described B2 also comprises:
Available OCTS number in the OBS round robin cycle of described people having a common goal community must be greater than the base station number of this people having a common goal community.
14, method according to claim 6 is characterized in that, described step B2 specifically comprises:
When the available OCTS in the described OBS round robin cycle at OBS and have on every side between the base station of overlapping coverage area and distribute, there are two base stations of overlapping coverage area can not take same OCTS, when not having two base stations of overlapping coverage area can take same OCTS each other, described OBS take in the described OBS round robin cycle not by with its OCTS time slot that has the base station of overlapping coverage area to take.
15, method according to claim 14 is characterized in that, described B2 also comprises:
Available OCTS number in the OBS round robin cycle of described people having a common goal community must be greater than the overlapping base station number of the maximum in this people having a common goal community.
16, method according to claim 6 is characterized in that, described step B also comprises:
The mapping table that each OCTS in OBS in the described OBS round robin cycle of maintenance record is taken by each OBS respectively, OBS selects and takies corresponding OCTS according to this mapping table.
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